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ARM: shmobile: bockw: Use shmobile_init_delay()
[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 /* Set to 3 to get tracing... */
68 #define MCAST_DEBUG 2
69
70 #if MCAST_DEBUG >= 3
71 #define MDBG(x) printk x
72 #else
73 #define MDBG(x)
74 #endif
75
76 /* Ensure that we have struct in6_addr aligned on 32bit word. */
77 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
78 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
79 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
80 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
81 };
82
83 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
84
85 /* Big mc list lock for all the sockets */
86 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
87
88 static void igmp6_join_group(struct ifmcaddr6 *ma);
89 static void igmp6_leave_group(struct ifmcaddr6 *ma);
90 static void igmp6_timer_handler(unsigned long data);
91
92 static void mld_gq_timer_expire(unsigned long data);
93 static void mld_ifc_timer_expire(unsigned long data);
94 static void mld_ifc_event(struct inet6_dev *idev);
95 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
96 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
97 static void mld_clear_delrec(struct inet6_dev *idev);
98 static bool mld_in_v1_mode(const struct inet6_dev *idev);
99 static int sf_setstate(struct ifmcaddr6 *pmc);
100 static void sf_markstate(struct ifmcaddr6 *pmc);
101 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
102 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
103 int sfmode, int sfcount, const struct in6_addr *psfsrc,
104 int delta);
105 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
106 int sfmode, int sfcount, const struct in6_addr *psfsrc,
107 int delta);
108 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
109 struct inet6_dev *idev);
110
111 #define MLD_QRV_DEFAULT 2
112 /* RFC3810, 9.2. Query Interval */
113 #define MLD_QI_DEFAULT (125 * HZ)
114 /* RFC3810, 9.3. Query Response Interval */
115 #define MLD_QRI_DEFAULT (10 * HZ)
116
117 /* RFC3810, 8.1 Query Version Distinctions */
118 #define MLD_V1_QUERY_LEN 24
119 #define MLD_V2_QUERY_LEN_MIN 28
120
121 #define IPV6_MLD_MAX_MSF 64
122
123 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
124
125 /*
126 * socket join on multicast group
127 */
128
129 #define for_each_pmc_rcu(np, pmc) \
130 for (pmc = rcu_dereference(np->ipv6_mc_list); \
131 pmc != NULL; \
132 pmc = rcu_dereference(pmc->next))
133
134 static int unsolicited_report_interval(struct inet6_dev *idev)
135 {
136 int iv;
137
138 if (mld_in_v1_mode(idev))
139 iv = idev->cnf.mldv1_unsolicited_report_interval;
140 else
141 iv = idev->cnf.mldv2_unsolicited_report_interval;
142
143 return iv > 0 ? iv : 1;
144 }
145
146 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
147 {
148 struct net_device *dev = NULL;
149 struct ipv6_mc_socklist *mc_lst;
150 struct ipv6_pinfo *np = inet6_sk(sk);
151 struct net *net = sock_net(sk);
152 int err;
153
154 if (!ipv6_addr_is_multicast(addr))
155 return -EINVAL;
156
157 rcu_read_lock();
158 for_each_pmc_rcu(np, mc_lst) {
159 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
160 ipv6_addr_equal(&mc_lst->addr, addr)) {
161 rcu_read_unlock();
162 return -EADDRINUSE;
163 }
164 }
165 rcu_read_unlock();
166
167 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
168
169 if (mc_lst == NULL)
170 return -ENOMEM;
171
172 mc_lst->next = NULL;
173 mc_lst->addr = *addr;
174
175 rcu_read_lock();
176 if (ifindex == 0) {
177 struct rt6_info *rt;
178 rt = rt6_lookup(net, addr, NULL, 0, 0);
179 if (rt) {
180 dev = rt->dst.dev;
181 ip6_rt_put(rt);
182 }
183 } else
184 dev = dev_get_by_index_rcu(net, ifindex);
185
186 if (dev == NULL) {
187 rcu_read_unlock();
188 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
189 return -ENODEV;
190 }
191
192 mc_lst->ifindex = dev->ifindex;
193 mc_lst->sfmode = MCAST_EXCLUDE;
194 rwlock_init(&mc_lst->sflock);
195 mc_lst->sflist = NULL;
196
197 /*
198 * now add/increase the group membership on the device
199 */
200
201 err = ipv6_dev_mc_inc(dev, addr);
202
203 if (err) {
204 rcu_read_unlock();
205 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
206 return err;
207 }
208
209 spin_lock(&ipv6_sk_mc_lock);
210 mc_lst->next = np->ipv6_mc_list;
211 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
212 spin_unlock(&ipv6_sk_mc_lock);
213
214 rcu_read_unlock();
215
216 return 0;
217 }
218
219 /*
220 * socket leave on multicast group
221 */
222 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
223 {
224 struct ipv6_pinfo *np = inet6_sk(sk);
225 struct ipv6_mc_socklist *mc_lst;
226 struct ipv6_mc_socklist __rcu **lnk;
227 struct net *net = sock_net(sk);
228
229 if (!ipv6_addr_is_multicast(addr))
230 return -EINVAL;
231
232 spin_lock(&ipv6_sk_mc_lock);
233 for (lnk = &np->ipv6_mc_list;
234 (mc_lst = rcu_dereference_protected(*lnk,
235 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
236 lnk = &mc_lst->next) {
237 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
238 ipv6_addr_equal(&mc_lst->addr, addr)) {
239 struct net_device *dev;
240
241 *lnk = mc_lst->next;
242 spin_unlock(&ipv6_sk_mc_lock);
243
244 rcu_read_lock();
245 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
246 if (dev != NULL) {
247 struct inet6_dev *idev = __in6_dev_get(dev);
248
249 (void) ip6_mc_leave_src(sk, mc_lst, idev);
250 if (idev)
251 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
252 } else
253 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
254 rcu_read_unlock();
255 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
256 kfree_rcu(mc_lst, rcu);
257 return 0;
258 }
259 }
260 spin_unlock(&ipv6_sk_mc_lock);
261
262 return -EADDRNOTAVAIL;
263 }
264
265 /* called with rcu_read_lock() */
266 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
267 const struct in6_addr *group,
268 int ifindex)
269 {
270 struct net_device *dev = NULL;
271 struct inet6_dev *idev = NULL;
272
273 if (ifindex == 0) {
274 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
275
276 if (rt) {
277 dev = rt->dst.dev;
278 ip6_rt_put(rt);
279 }
280 } else
281 dev = dev_get_by_index_rcu(net, ifindex);
282
283 if (!dev)
284 return NULL;
285 idev = __in6_dev_get(dev);
286 if (!idev)
287 return NULL;
288 read_lock_bh(&idev->lock);
289 if (idev->dead) {
290 read_unlock_bh(&idev->lock);
291 return NULL;
292 }
293 return idev;
294 }
295
296 void ipv6_sock_mc_close(struct sock *sk)
297 {
298 struct ipv6_pinfo *np = inet6_sk(sk);
299 struct ipv6_mc_socklist *mc_lst;
300 struct net *net = sock_net(sk);
301
302 if (!rcu_access_pointer(np->ipv6_mc_list))
303 return;
304
305 spin_lock(&ipv6_sk_mc_lock);
306 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
307 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
308 struct net_device *dev;
309
310 np->ipv6_mc_list = mc_lst->next;
311 spin_unlock(&ipv6_sk_mc_lock);
312
313 rcu_read_lock();
314 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
315 if (dev) {
316 struct inet6_dev *idev = __in6_dev_get(dev);
317
318 (void) ip6_mc_leave_src(sk, mc_lst, idev);
319 if (idev)
320 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
321 } else
322 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
323 rcu_read_unlock();
324
325 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
326 kfree_rcu(mc_lst, rcu);
327
328 spin_lock(&ipv6_sk_mc_lock);
329 }
330 spin_unlock(&ipv6_sk_mc_lock);
331 }
332
333 int ip6_mc_source(int add, int omode, struct sock *sk,
334 struct group_source_req *pgsr)
335 {
336 struct in6_addr *source, *group;
337 struct ipv6_mc_socklist *pmc;
338 struct inet6_dev *idev;
339 struct ipv6_pinfo *inet6 = inet6_sk(sk);
340 struct ip6_sf_socklist *psl;
341 struct net *net = sock_net(sk);
342 int i, j, rv;
343 int leavegroup = 0;
344 int pmclocked = 0;
345 int err;
346
347 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
348 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
349
350 if (!ipv6_addr_is_multicast(group))
351 return -EINVAL;
352
353 rcu_read_lock();
354 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
355 if (!idev) {
356 rcu_read_unlock();
357 return -ENODEV;
358 }
359
360 err = -EADDRNOTAVAIL;
361
362 for_each_pmc_rcu(inet6, pmc) {
363 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
364 continue;
365 if (ipv6_addr_equal(&pmc->addr, group))
366 break;
367 }
368 if (!pmc) { /* must have a prior join */
369 err = -EINVAL;
370 goto done;
371 }
372 /* if a source filter was set, must be the same mode as before */
373 if (pmc->sflist) {
374 if (pmc->sfmode != omode) {
375 err = -EINVAL;
376 goto done;
377 }
378 } else if (pmc->sfmode != omode) {
379 /* allow mode switches for empty-set filters */
380 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
381 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
382 pmc->sfmode = omode;
383 }
384
385 write_lock(&pmc->sflock);
386 pmclocked = 1;
387
388 psl = pmc->sflist;
389 if (!add) {
390 if (!psl)
391 goto done; /* err = -EADDRNOTAVAIL */
392 rv = !0;
393 for (i=0; i<psl->sl_count; i++) {
394 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
395 if (rv == 0)
396 break;
397 }
398 if (rv) /* source not found */
399 goto done; /* err = -EADDRNOTAVAIL */
400
401 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
402 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
403 leavegroup = 1;
404 goto done;
405 }
406
407 /* update the interface filter */
408 ip6_mc_del_src(idev, group, omode, 1, source, 1);
409
410 for (j=i+1; j<psl->sl_count; j++)
411 psl->sl_addr[j-1] = psl->sl_addr[j];
412 psl->sl_count--;
413 err = 0;
414 goto done;
415 }
416 /* else, add a new source to the filter */
417
418 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
419 err = -ENOBUFS;
420 goto done;
421 }
422 if (!psl || psl->sl_count == psl->sl_max) {
423 struct ip6_sf_socklist *newpsl;
424 int count = IP6_SFBLOCK;
425
426 if (psl)
427 count += psl->sl_max;
428 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
429 if (!newpsl) {
430 err = -ENOBUFS;
431 goto done;
432 }
433 newpsl->sl_max = count;
434 newpsl->sl_count = count - IP6_SFBLOCK;
435 if (psl) {
436 for (i=0; i<psl->sl_count; i++)
437 newpsl->sl_addr[i] = psl->sl_addr[i];
438 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
439 }
440 pmc->sflist = psl = newpsl;
441 }
442 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
443 for (i=0; i<psl->sl_count; i++) {
444 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
445 if (rv == 0) /* There is an error in the address. */
446 goto done;
447 }
448 for (j=psl->sl_count-1; j>=i; j--)
449 psl->sl_addr[j+1] = psl->sl_addr[j];
450 psl->sl_addr[i] = *source;
451 psl->sl_count++;
452 err = 0;
453 /* update the interface list */
454 ip6_mc_add_src(idev, group, omode, 1, source, 1);
455 done:
456 if (pmclocked)
457 write_unlock(&pmc->sflock);
458 read_unlock_bh(&idev->lock);
459 rcu_read_unlock();
460 if (leavegroup)
461 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
462 return err;
463 }
464
465 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
466 {
467 const struct in6_addr *group;
468 struct ipv6_mc_socklist *pmc;
469 struct inet6_dev *idev;
470 struct ipv6_pinfo *inet6 = inet6_sk(sk);
471 struct ip6_sf_socklist *newpsl, *psl;
472 struct net *net = sock_net(sk);
473 int leavegroup = 0;
474 int i, err;
475
476 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
477
478 if (!ipv6_addr_is_multicast(group))
479 return -EINVAL;
480 if (gsf->gf_fmode != MCAST_INCLUDE &&
481 gsf->gf_fmode != MCAST_EXCLUDE)
482 return -EINVAL;
483
484 rcu_read_lock();
485 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
486
487 if (!idev) {
488 rcu_read_unlock();
489 return -ENODEV;
490 }
491
492 err = 0;
493
494 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
495 leavegroup = 1;
496 goto done;
497 }
498
499 for_each_pmc_rcu(inet6, pmc) {
500 if (pmc->ifindex != gsf->gf_interface)
501 continue;
502 if (ipv6_addr_equal(&pmc->addr, group))
503 break;
504 }
505 if (!pmc) { /* must have a prior join */
506 err = -EINVAL;
507 goto done;
508 }
509 if (gsf->gf_numsrc) {
510 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
511 GFP_ATOMIC);
512 if (!newpsl) {
513 err = -ENOBUFS;
514 goto done;
515 }
516 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
517 for (i=0; i<newpsl->sl_count; ++i) {
518 struct sockaddr_in6 *psin6;
519
520 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
521 newpsl->sl_addr[i] = psin6->sin6_addr;
522 }
523 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
524 newpsl->sl_count, newpsl->sl_addr, 0);
525 if (err) {
526 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
527 goto done;
528 }
529 } else {
530 newpsl = NULL;
531 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
532 }
533
534 write_lock(&pmc->sflock);
535 psl = pmc->sflist;
536 if (psl) {
537 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
538 psl->sl_count, psl->sl_addr, 0);
539 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
540 } else
541 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
542 pmc->sflist = newpsl;
543 pmc->sfmode = gsf->gf_fmode;
544 write_unlock(&pmc->sflock);
545 err = 0;
546 done:
547 read_unlock_bh(&idev->lock);
548 rcu_read_unlock();
549 if (leavegroup)
550 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
551 return err;
552 }
553
554 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
555 struct group_filter __user *optval, int __user *optlen)
556 {
557 int err, i, count, copycount;
558 const struct in6_addr *group;
559 struct ipv6_mc_socklist *pmc;
560 struct inet6_dev *idev;
561 struct ipv6_pinfo *inet6 = inet6_sk(sk);
562 struct ip6_sf_socklist *psl;
563 struct net *net = sock_net(sk);
564
565 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
566
567 if (!ipv6_addr_is_multicast(group))
568 return -EINVAL;
569
570 rcu_read_lock();
571 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
572
573 if (!idev) {
574 rcu_read_unlock();
575 return -ENODEV;
576 }
577
578 err = -EADDRNOTAVAIL;
579 /*
580 * changes to the ipv6_mc_list require the socket lock and
581 * a read lock on ip6_sk_mc_lock. We have the socket lock,
582 * so reading the list is safe.
583 */
584
585 for_each_pmc_rcu(inet6, pmc) {
586 if (pmc->ifindex != gsf->gf_interface)
587 continue;
588 if (ipv6_addr_equal(group, &pmc->addr))
589 break;
590 }
591 if (!pmc) /* must have a prior join */
592 goto done;
593 gsf->gf_fmode = pmc->sfmode;
594 psl = pmc->sflist;
595 count = psl ? psl->sl_count : 0;
596 read_unlock_bh(&idev->lock);
597 rcu_read_unlock();
598
599 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
600 gsf->gf_numsrc = count;
601 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
602 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
603 return -EFAULT;
604 }
605 /* changes to psl require the socket lock, a read lock on
606 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
607 * 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 ma_put(struct ifmcaddr6 *mc)
667 {
668 if (atomic_dec_and_test(&mc->mca_refcnt)) {
669 in6_dev_put(mc->idev);
670 kfree(mc);
671 }
672 }
673
674 static void igmp6_group_added(struct ifmcaddr6 *mc)
675 {
676 struct net_device *dev = mc->idev->dev;
677 char buf[MAX_ADDR_LEN];
678
679 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
680 IPV6_ADDR_SCOPE_LINKLOCAL)
681 return;
682
683 spin_lock_bh(&mc->mca_lock);
684 if (!(mc->mca_flags&MAF_LOADED)) {
685 mc->mca_flags |= MAF_LOADED;
686 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
687 dev_mc_add(dev, buf);
688 }
689 spin_unlock_bh(&mc->mca_lock);
690
691 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
692 return;
693
694 if (mld_in_v1_mode(mc->idev)) {
695 igmp6_join_group(mc);
696 return;
697 }
698 /* else v2 */
699
700 mc->mca_crcount = mc->idev->mc_qrv;
701 mld_ifc_event(mc->idev);
702 }
703
704 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
705 {
706 struct net_device *dev = mc->idev->dev;
707 char buf[MAX_ADDR_LEN];
708
709 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
710 IPV6_ADDR_SCOPE_LINKLOCAL)
711 return;
712
713 spin_lock_bh(&mc->mca_lock);
714 if (mc->mca_flags&MAF_LOADED) {
715 mc->mca_flags &= ~MAF_LOADED;
716 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
717 dev_mc_del(dev, buf);
718 }
719
720 if (mc->mca_flags & MAF_NOREPORT)
721 goto done;
722 spin_unlock_bh(&mc->mca_lock);
723
724 if (!mc->idev->dead)
725 igmp6_leave_group(mc);
726
727 spin_lock_bh(&mc->mca_lock);
728 if (del_timer(&mc->mca_timer))
729 atomic_dec(&mc->mca_refcnt);
730 done:
731 ip6_mc_clear_src(mc);
732 spin_unlock_bh(&mc->mca_lock);
733 }
734
735 /*
736 * deleted ifmcaddr6 manipulation
737 */
738 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
739 {
740 struct ifmcaddr6 *pmc;
741
742 /* this is an "ifmcaddr6" for convenience; only the fields below
743 * are actually used. In particular, the refcnt and users are not
744 * used for management of the delete list. Using the same structure
745 * for deleted items allows change reports to use common code with
746 * non-deleted or query-response MCA's.
747 */
748 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
749 if (!pmc)
750 return;
751
752 spin_lock_bh(&im->mca_lock);
753 spin_lock_init(&pmc->mca_lock);
754 pmc->idev = im->idev;
755 in6_dev_hold(idev);
756 pmc->mca_addr = im->mca_addr;
757 pmc->mca_crcount = idev->mc_qrv;
758 pmc->mca_sfmode = im->mca_sfmode;
759 if (pmc->mca_sfmode == MCAST_INCLUDE) {
760 struct ip6_sf_list *psf;
761
762 pmc->mca_tomb = im->mca_tomb;
763 pmc->mca_sources = im->mca_sources;
764 im->mca_tomb = im->mca_sources = NULL;
765 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
766 psf->sf_crcount = pmc->mca_crcount;
767 }
768 spin_unlock_bh(&im->mca_lock);
769
770 spin_lock_bh(&idev->mc_lock);
771 pmc->next = idev->mc_tomb;
772 idev->mc_tomb = pmc;
773 spin_unlock_bh(&idev->mc_lock);
774 }
775
776 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
777 {
778 struct ifmcaddr6 *pmc, *pmc_prev;
779 struct ip6_sf_list *psf, *psf_next;
780
781 spin_lock_bh(&idev->mc_lock);
782 pmc_prev = NULL;
783 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
784 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
785 break;
786 pmc_prev = pmc;
787 }
788 if (pmc) {
789 if (pmc_prev)
790 pmc_prev->next = pmc->next;
791 else
792 idev->mc_tomb = pmc->next;
793 }
794 spin_unlock_bh(&idev->mc_lock);
795
796 if (pmc) {
797 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
798 psf_next = psf->sf_next;
799 kfree(psf);
800 }
801 in6_dev_put(pmc->idev);
802 kfree(pmc);
803 }
804 }
805
806 static void mld_clear_delrec(struct inet6_dev *idev)
807 {
808 struct ifmcaddr6 *pmc, *nextpmc;
809
810 spin_lock_bh(&idev->mc_lock);
811 pmc = idev->mc_tomb;
812 idev->mc_tomb = NULL;
813 spin_unlock_bh(&idev->mc_lock);
814
815 for (; pmc; pmc = nextpmc) {
816 nextpmc = pmc->next;
817 ip6_mc_clear_src(pmc);
818 in6_dev_put(pmc->idev);
819 kfree(pmc);
820 }
821
822 /* clear dead sources, too */
823 read_lock_bh(&idev->lock);
824 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
825 struct ip6_sf_list *psf, *psf_next;
826
827 spin_lock_bh(&pmc->mca_lock);
828 psf = pmc->mca_tomb;
829 pmc->mca_tomb = NULL;
830 spin_unlock_bh(&pmc->mca_lock);
831 for (; psf; psf=psf_next) {
832 psf_next = psf->sf_next;
833 kfree(psf);
834 }
835 }
836 read_unlock_bh(&idev->lock);
837 }
838
839
840 /*
841 * device multicast group inc (add if not found)
842 */
843 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
844 {
845 struct ifmcaddr6 *mc;
846 struct inet6_dev *idev;
847
848 /* we need to take a reference on idev */
849 idev = in6_dev_get(dev);
850
851 if (idev == NULL)
852 return -EINVAL;
853
854 write_lock_bh(&idev->lock);
855 if (idev->dead) {
856 write_unlock_bh(&idev->lock);
857 in6_dev_put(idev);
858 return -ENODEV;
859 }
860
861 for (mc = idev->mc_list; mc; mc = mc->next) {
862 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
863 mc->mca_users++;
864 write_unlock_bh(&idev->lock);
865 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
866 NULL, 0);
867 in6_dev_put(idev);
868 return 0;
869 }
870 }
871
872 /*
873 * not found: create a new one.
874 */
875
876 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
877
878 if (mc == NULL) {
879 write_unlock_bh(&idev->lock);
880 in6_dev_put(idev);
881 return -ENOMEM;
882 }
883
884 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
885
886 mc->mca_addr = *addr;
887 mc->idev = idev; /* (reference taken) */
888 mc->mca_users = 1;
889 /* mca_stamp should be updated upon changes */
890 mc->mca_cstamp = mc->mca_tstamp = jiffies;
891 atomic_set(&mc->mca_refcnt, 2);
892 spin_lock_init(&mc->mca_lock);
893
894 /* initial mode is (EX, empty) */
895 mc->mca_sfmode = MCAST_EXCLUDE;
896 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
897
898 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
899 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
900 mc->mca_flags |= MAF_NOREPORT;
901
902 mc->next = idev->mc_list;
903 idev->mc_list = mc;
904 write_unlock_bh(&idev->lock);
905
906 mld_del_delrec(idev, &mc->mca_addr);
907 igmp6_group_added(mc);
908 ma_put(mc);
909 return 0;
910 }
911
912 /*
913 * device multicast group del
914 */
915 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
916 {
917 struct ifmcaddr6 *ma, **map;
918
919 write_lock_bh(&idev->lock);
920 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
921 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
922 if (--ma->mca_users == 0) {
923 *map = ma->next;
924 write_unlock_bh(&idev->lock);
925
926 igmp6_group_dropped(ma);
927
928 ma_put(ma);
929 return 0;
930 }
931 write_unlock_bh(&idev->lock);
932 return 0;
933 }
934 }
935 write_unlock_bh(&idev->lock);
936
937 return -ENOENT;
938 }
939
940 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
941 {
942 struct inet6_dev *idev;
943 int err;
944
945 rcu_read_lock();
946
947 idev = __in6_dev_get(dev);
948 if (!idev)
949 err = -ENODEV;
950 else
951 err = __ipv6_dev_mc_dec(idev, addr);
952
953 rcu_read_unlock();
954 return err;
955 }
956
957 /*
958 * check if the interface/address pair is valid
959 */
960 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
961 const struct in6_addr *src_addr)
962 {
963 struct inet6_dev *idev;
964 struct ifmcaddr6 *mc;
965 bool rv = false;
966
967 rcu_read_lock();
968 idev = __in6_dev_get(dev);
969 if (idev) {
970 read_lock_bh(&idev->lock);
971 for (mc = idev->mc_list; mc; mc=mc->next) {
972 if (ipv6_addr_equal(&mc->mca_addr, group))
973 break;
974 }
975 if (mc) {
976 if (src_addr && !ipv6_addr_any(src_addr)) {
977 struct ip6_sf_list *psf;
978
979 spin_lock_bh(&mc->mca_lock);
980 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
981 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
982 break;
983 }
984 if (psf)
985 rv = psf->sf_count[MCAST_INCLUDE] ||
986 psf->sf_count[MCAST_EXCLUDE] !=
987 mc->mca_sfcount[MCAST_EXCLUDE];
988 else
989 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
990 spin_unlock_bh(&mc->mca_lock);
991 } else
992 rv = true; /* don't filter unspecified source */
993 }
994 read_unlock_bh(&idev->lock);
995 }
996 rcu_read_unlock();
997 return rv;
998 }
999
1000 static void mld_gq_start_timer(struct inet6_dev *idev)
1001 {
1002 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1003
1004 idev->mc_gq_running = 1;
1005 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1006 in6_dev_hold(idev);
1007 }
1008
1009 static void mld_gq_stop_timer(struct inet6_dev *idev)
1010 {
1011 idev->mc_gq_running = 0;
1012 if (del_timer(&idev->mc_gq_timer))
1013 __in6_dev_put(idev);
1014 }
1015
1016 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1017 {
1018 unsigned long tv = prandom_u32() % delay;
1019
1020 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1021 in6_dev_hold(idev);
1022 }
1023
1024 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1025 {
1026 idev->mc_ifc_count = 0;
1027 if (del_timer(&idev->mc_ifc_timer))
1028 __in6_dev_put(idev);
1029 }
1030
1031 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1032 {
1033 unsigned long tv = prandom_u32() % delay;
1034
1035 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1036 in6_dev_hold(idev);
1037 }
1038
1039 static void mld_dad_stop_timer(struct inet6_dev *idev)
1040 {
1041 if (del_timer(&idev->mc_dad_timer))
1042 __in6_dev_put(idev);
1043 }
1044
1045 /*
1046 * IGMP handling (alias multicast ICMPv6 messages)
1047 */
1048
1049 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1050 {
1051 unsigned long delay = resptime;
1052
1053 /* Do not start timer for these addresses */
1054 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1055 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1056 return;
1057
1058 if (del_timer(&ma->mca_timer)) {
1059 atomic_dec(&ma->mca_refcnt);
1060 delay = ma->mca_timer.expires - jiffies;
1061 }
1062
1063 if (delay >= resptime)
1064 delay = prandom_u32() % resptime;
1065
1066 ma->mca_timer.expires = jiffies + delay;
1067 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1068 atomic_inc(&ma->mca_refcnt);
1069 ma->mca_flags |= MAF_TIMER_RUNNING;
1070 }
1071
1072 /* mark EXCLUDE-mode sources */
1073 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1074 const struct in6_addr *srcs)
1075 {
1076 struct ip6_sf_list *psf;
1077 int i, scount;
1078
1079 scount = 0;
1080 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1081 if (scount == nsrcs)
1082 break;
1083 for (i=0; i<nsrcs; i++) {
1084 /* skip inactive filters */
1085 if (psf->sf_count[MCAST_INCLUDE] ||
1086 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1087 psf->sf_count[MCAST_EXCLUDE])
1088 break;
1089 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1090 scount++;
1091 break;
1092 }
1093 }
1094 }
1095 pmc->mca_flags &= ~MAF_GSQUERY;
1096 if (scount == nsrcs) /* all sources excluded */
1097 return false;
1098 return true;
1099 }
1100
1101 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1102 const struct in6_addr *srcs)
1103 {
1104 struct ip6_sf_list *psf;
1105 int i, scount;
1106
1107 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1108 return mld_xmarksources(pmc, nsrcs, srcs);
1109
1110 /* mark INCLUDE-mode sources */
1111
1112 scount = 0;
1113 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1114 if (scount == nsrcs)
1115 break;
1116 for (i=0; i<nsrcs; i++) {
1117 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1118 psf->sf_gsresp = 1;
1119 scount++;
1120 break;
1121 }
1122 }
1123 }
1124 if (!scount) {
1125 pmc->mca_flags &= ~MAF_GSQUERY;
1126 return false;
1127 }
1128 pmc->mca_flags |= MAF_GSQUERY;
1129 return true;
1130 }
1131
1132 static int mld_force_mld_version(const struct inet6_dev *idev)
1133 {
1134 /* Normally, both are 0 here. If enforcement to a particular is
1135 * being used, individual device enforcement will have a lower
1136 * precedence over 'all' device (.../conf/all/force_mld_version).
1137 */
1138
1139 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1140 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1141 else
1142 return idev->cnf.force_mld_version;
1143 }
1144
1145 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1146 {
1147 return mld_force_mld_version(idev) == 2;
1148 }
1149
1150 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1151 {
1152 return mld_force_mld_version(idev) == 1;
1153 }
1154
1155 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1156 {
1157 if (mld_in_v2_mode_only(idev))
1158 return false;
1159 if (mld_in_v1_mode_only(idev))
1160 return true;
1161 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1162 return true;
1163
1164 return false;
1165 }
1166
1167 static void mld_set_v1_mode(struct inet6_dev *idev)
1168 {
1169 /* RFC3810, relevant sections:
1170 * - 9.1. Robustness Variable
1171 * - 9.2. Query Interval
1172 * - 9.3. Query Response Interval
1173 * - 9.12. Older Version Querier Present Timeout
1174 */
1175 unsigned long switchback;
1176
1177 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1178
1179 idev->mc_v1_seen = jiffies + switchback;
1180 }
1181
1182 static void mld_update_qrv(struct inet6_dev *idev,
1183 const struct mld2_query *mlh2)
1184 {
1185 /* RFC3810, relevant sections:
1186 * - 5.1.8. QRV (Querier's Robustness Variable)
1187 * - 9.1. Robustness Variable
1188 */
1189
1190 /* The value of the Robustness Variable MUST NOT be zero,
1191 * and SHOULD NOT be one. Catch this here if we ever run
1192 * into such a case in future.
1193 */
1194 WARN_ON(idev->mc_qrv == 0);
1195
1196 if (mlh2->mld2q_qrv > 0)
1197 idev->mc_qrv = mlh2->mld2q_qrv;
1198
1199 if (unlikely(idev->mc_qrv < 2)) {
1200 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1201 idev->mc_qrv, MLD_QRV_DEFAULT);
1202 idev->mc_qrv = MLD_QRV_DEFAULT;
1203 }
1204 }
1205
1206 static void mld_update_qi(struct inet6_dev *idev,
1207 const struct mld2_query *mlh2)
1208 {
1209 /* RFC3810, relevant sections:
1210 * - 5.1.9. QQIC (Querier's Query Interval Code)
1211 * - 9.2. Query Interval
1212 * - 9.12. Older Version Querier Present Timeout
1213 * (the [Query Interval] in the last Query received)
1214 */
1215 unsigned long mc_qqi;
1216
1217 if (mlh2->mld2q_qqic < 128) {
1218 mc_qqi = mlh2->mld2q_qqic;
1219 } else {
1220 unsigned long mc_man, mc_exp;
1221
1222 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1223 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1224
1225 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1226 }
1227
1228 idev->mc_qi = mc_qqi * HZ;
1229 }
1230
1231 static void mld_update_qri(struct inet6_dev *idev,
1232 const struct mld2_query *mlh2)
1233 {
1234 /* RFC3810, relevant sections:
1235 * - 5.1.3. Maximum Response Code
1236 * - 9.3. Query Response Interval
1237 */
1238 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1239 }
1240
1241 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1242 unsigned long *max_delay)
1243 {
1244 unsigned long mldv1_md;
1245
1246 /* Ignore v1 queries */
1247 if (mld_in_v2_mode_only(idev))
1248 return -EINVAL;
1249
1250 /* MLDv1 router present */
1251 mldv1_md = ntohs(mld->mld_maxdelay);
1252 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1253
1254 mld_set_v1_mode(idev);
1255
1256 /* cancel MLDv2 report timer */
1257 mld_gq_stop_timer(idev);
1258 /* cancel the interface change timer */
1259 mld_ifc_stop_timer(idev);
1260 /* clear deleted report items */
1261 mld_clear_delrec(idev);
1262
1263 return 0;
1264 }
1265
1266 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1267 unsigned long *max_delay)
1268 {
1269 /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1270 if (mld_in_v1_mode(idev))
1271 return -EINVAL;
1272
1273 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1274
1275 mld_update_qrv(idev, mld);
1276 mld_update_qi(idev, mld);
1277 mld_update_qri(idev, mld);
1278
1279 idev->mc_maxdelay = *max_delay;
1280
1281 return 0;
1282 }
1283
1284 /* called with rcu_read_lock() */
1285 int igmp6_event_query(struct sk_buff *skb)
1286 {
1287 struct mld2_query *mlh2 = NULL;
1288 struct ifmcaddr6 *ma;
1289 const struct in6_addr *group;
1290 unsigned long max_delay;
1291 struct inet6_dev *idev;
1292 struct mld_msg *mld;
1293 int group_type;
1294 int mark = 0;
1295 int len, err;
1296
1297 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1298 return -EINVAL;
1299
1300 /* compute payload length excluding extension headers */
1301 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1302 len -= skb_network_header_len(skb);
1303
1304 /* RFC3810 6.2
1305 * Upon reception of an MLD message that contains a Query, the node
1306 * checks if the source address of the message is a valid link-local
1307 * address, if the Hop Limit is set to 1, and if the Router Alert
1308 * option is present in the Hop-By-Hop Options header of the IPv6
1309 * packet. If any of these checks fails, the packet is dropped.
1310 */
1311 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1312 ipv6_hdr(skb)->hop_limit != 1 ||
1313 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1314 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1315 return -EINVAL;
1316
1317 idev = __in6_dev_get(skb->dev);
1318 if (idev == NULL)
1319 return 0;
1320
1321 mld = (struct mld_msg *)icmp6_hdr(skb);
1322 group = &mld->mld_mca;
1323 group_type = ipv6_addr_type(group);
1324
1325 if (group_type != IPV6_ADDR_ANY &&
1326 !(group_type&IPV6_ADDR_MULTICAST))
1327 return -EINVAL;
1328
1329 if (len == MLD_V1_QUERY_LEN) {
1330 err = mld_process_v1(idev, mld, &max_delay);
1331 if (err < 0)
1332 return err;
1333 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1334 int srcs_offset = sizeof(struct mld2_query) -
1335 sizeof(struct icmp6hdr);
1336
1337 if (!pskb_may_pull(skb, srcs_offset))
1338 return -EINVAL;
1339
1340 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1341
1342 err = mld_process_v2(idev, mlh2, &max_delay);
1343 if (err < 0)
1344 return err;
1345
1346 if (group_type == IPV6_ADDR_ANY) { /* general query */
1347 if (mlh2->mld2q_nsrcs)
1348 return -EINVAL; /* no sources allowed */
1349
1350 mld_gq_start_timer(idev);
1351 return 0;
1352 }
1353 /* mark sources to include, if group & source-specific */
1354 if (mlh2->mld2q_nsrcs != 0) {
1355 if (!pskb_may_pull(skb, srcs_offset +
1356 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1357 return -EINVAL;
1358
1359 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1360 mark = 1;
1361 }
1362 } else
1363 return -EINVAL;
1364
1365 read_lock_bh(&idev->lock);
1366 if (group_type == IPV6_ADDR_ANY) {
1367 for (ma = idev->mc_list; ma; ma=ma->next) {
1368 spin_lock_bh(&ma->mca_lock);
1369 igmp6_group_queried(ma, max_delay);
1370 spin_unlock_bh(&ma->mca_lock);
1371 }
1372 } else {
1373 for (ma = idev->mc_list; ma; ma=ma->next) {
1374 if (!ipv6_addr_equal(group, &ma->mca_addr))
1375 continue;
1376 spin_lock_bh(&ma->mca_lock);
1377 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1378 /* gsquery <- gsquery && mark */
1379 if (!mark)
1380 ma->mca_flags &= ~MAF_GSQUERY;
1381 } else {
1382 /* gsquery <- mark */
1383 if (mark)
1384 ma->mca_flags |= MAF_GSQUERY;
1385 else
1386 ma->mca_flags &= ~MAF_GSQUERY;
1387 }
1388 if (!(ma->mca_flags & MAF_GSQUERY) ||
1389 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1390 igmp6_group_queried(ma, max_delay);
1391 spin_unlock_bh(&ma->mca_lock);
1392 break;
1393 }
1394 }
1395 read_unlock_bh(&idev->lock);
1396
1397 return 0;
1398 }
1399
1400 /* called with rcu_read_lock() */
1401 int igmp6_event_report(struct sk_buff *skb)
1402 {
1403 struct ifmcaddr6 *ma;
1404 struct inet6_dev *idev;
1405 struct mld_msg *mld;
1406 int addr_type;
1407
1408 /* Our own report looped back. Ignore it. */
1409 if (skb->pkt_type == PACKET_LOOPBACK)
1410 return 0;
1411
1412 /* send our report if the MC router may not have heard this report */
1413 if (skb->pkt_type != PACKET_MULTICAST &&
1414 skb->pkt_type != PACKET_BROADCAST)
1415 return 0;
1416
1417 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1418 return -EINVAL;
1419
1420 mld = (struct mld_msg *)icmp6_hdr(skb);
1421
1422 /* Drop reports with not link local source */
1423 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1424 if (addr_type != IPV6_ADDR_ANY &&
1425 !(addr_type&IPV6_ADDR_LINKLOCAL))
1426 return -EINVAL;
1427
1428 idev = __in6_dev_get(skb->dev);
1429 if (idev == NULL)
1430 return -ENODEV;
1431
1432 /*
1433 * Cancel the timer for this group
1434 */
1435
1436 read_lock_bh(&idev->lock);
1437 for (ma = idev->mc_list; ma; ma=ma->next) {
1438 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1439 spin_lock(&ma->mca_lock);
1440 if (del_timer(&ma->mca_timer))
1441 atomic_dec(&ma->mca_refcnt);
1442 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1443 spin_unlock(&ma->mca_lock);
1444 break;
1445 }
1446 }
1447 read_unlock_bh(&idev->lock);
1448 return 0;
1449 }
1450
1451 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1452 int gdeleted, int sdeleted)
1453 {
1454 switch (type) {
1455 case MLD2_MODE_IS_INCLUDE:
1456 case MLD2_MODE_IS_EXCLUDE:
1457 if (gdeleted || sdeleted)
1458 return false;
1459 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1460 if (pmc->mca_sfmode == MCAST_INCLUDE)
1461 return true;
1462 /* don't include if this source is excluded
1463 * in all filters
1464 */
1465 if (psf->sf_count[MCAST_INCLUDE])
1466 return type == MLD2_MODE_IS_INCLUDE;
1467 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1468 psf->sf_count[MCAST_EXCLUDE];
1469 }
1470 return false;
1471 case MLD2_CHANGE_TO_INCLUDE:
1472 if (gdeleted || sdeleted)
1473 return false;
1474 return psf->sf_count[MCAST_INCLUDE] != 0;
1475 case MLD2_CHANGE_TO_EXCLUDE:
1476 if (gdeleted || sdeleted)
1477 return false;
1478 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1479 psf->sf_count[MCAST_INCLUDE])
1480 return false;
1481 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1482 psf->sf_count[MCAST_EXCLUDE];
1483 case MLD2_ALLOW_NEW_SOURCES:
1484 if (gdeleted || !psf->sf_crcount)
1485 return false;
1486 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1487 case MLD2_BLOCK_OLD_SOURCES:
1488 if (pmc->mca_sfmode == MCAST_INCLUDE)
1489 return gdeleted || (psf->sf_crcount && sdeleted);
1490 return psf->sf_crcount && !gdeleted && !sdeleted;
1491 }
1492 return false;
1493 }
1494
1495 static int
1496 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1497 {
1498 struct ip6_sf_list *psf;
1499 int scount = 0;
1500
1501 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1502 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1503 continue;
1504 scount++;
1505 }
1506 return scount;
1507 }
1508
1509 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1510 struct net_device *dev,
1511 const struct in6_addr *saddr,
1512 const struct in6_addr *daddr,
1513 int proto, int len)
1514 {
1515 struct ipv6hdr *hdr;
1516
1517 skb->protocol = htons(ETH_P_IPV6);
1518 skb->dev = dev;
1519
1520 skb_reset_network_header(skb);
1521 skb_put(skb, sizeof(struct ipv6hdr));
1522 hdr = ipv6_hdr(skb);
1523
1524 ip6_flow_hdr(hdr, 0, 0);
1525
1526 hdr->payload_len = htons(len);
1527 hdr->nexthdr = proto;
1528 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1529
1530 hdr->saddr = *saddr;
1531 hdr->daddr = *daddr;
1532 }
1533
1534 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1535 {
1536 struct net_device *dev = idev->dev;
1537 struct net *net = dev_net(dev);
1538 struct sock *sk = net->ipv6.igmp_sk;
1539 struct sk_buff *skb;
1540 struct mld2_report *pmr;
1541 struct in6_addr addr_buf;
1542 const struct in6_addr *saddr;
1543 int hlen = LL_RESERVED_SPACE(dev);
1544 int tlen = dev->needed_tailroom;
1545 int err;
1546 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1547 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1548 IPV6_TLV_PADN, 0 };
1549
1550 /* we assume size > sizeof(ra) here */
1551 size += hlen + tlen;
1552 /* limit our allocations to order-0 page */
1553 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1554 skb = sock_alloc_send_skb(sk, size, 1, &err);
1555
1556 if (!skb)
1557 return NULL;
1558
1559 skb->priority = TC_PRIO_CONTROL;
1560 skb_reserve(skb, hlen);
1561
1562 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1563 /* <draft-ietf-magma-mld-source-05.txt>:
1564 * use unspecified address as the source address
1565 * when a valid link-local address is not available.
1566 */
1567 saddr = &in6addr_any;
1568 } else
1569 saddr = &addr_buf;
1570
1571 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1572
1573 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1574
1575 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1576 skb_put(skb, sizeof(*pmr));
1577 pmr = (struct mld2_report *)skb_transport_header(skb);
1578 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1579 pmr->mld2r_resv1 = 0;
1580 pmr->mld2r_cksum = 0;
1581 pmr->mld2r_resv2 = 0;
1582 pmr->mld2r_ngrec = 0;
1583 return skb;
1584 }
1585
1586 static void mld_sendpack(struct sk_buff *skb)
1587 {
1588 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1589 struct mld2_report *pmr =
1590 (struct mld2_report *)skb_transport_header(skb);
1591 int payload_len, mldlen;
1592 struct inet6_dev *idev;
1593 struct net *net = dev_net(skb->dev);
1594 int err;
1595 struct flowi6 fl6;
1596 struct dst_entry *dst;
1597
1598 rcu_read_lock();
1599 idev = __in6_dev_get(skb->dev);
1600 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1601
1602 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1603 sizeof(*pip6);
1604 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1605 pip6->payload_len = htons(payload_len);
1606
1607 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1608 IPPROTO_ICMPV6,
1609 csum_partial(skb_transport_header(skb),
1610 mldlen, 0));
1611
1612 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1613 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1614 skb->dev->ifindex);
1615 dst = icmp6_dst_alloc(skb->dev, &fl6);
1616
1617 err = 0;
1618 if (IS_ERR(dst)) {
1619 err = PTR_ERR(dst);
1620 dst = NULL;
1621 }
1622 skb_dst_set(skb, dst);
1623 if (err)
1624 goto err_out;
1625
1626 payload_len = skb->len;
1627
1628 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1629 dst_output);
1630 out:
1631 if (!err) {
1632 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1633 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1634 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1635 } else {
1636 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1637 }
1638
1639 rcu_read_unlock();
1640 return;
1641
1642 err_out:
1643 kfree_skb(skb);
1644 goto out;
1645 }
1646
1647 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1648 {
1649 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1650 }
1651
1652 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1653 int type, struct mld2_grec **ppgr)
1654 {
1655 struct net_device *dev = pmc->idev->dev;
1656 struct mld2_report *pmr;
1657 struct mld2_grec *pgr;
1658
1659 if (!skb)
1660 skb = mld_newpack(pmc->idev, dev->mtu);
1661 if (!skb)
1662 return NULL;
1663 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1664 pgr->grec_type = type;
1665 pgr->grec_auxwords = 0;
1666 pgr->grec_nsrcs = 0;
1667 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1668 pmr = (struct mld2_report *)skb_transport_header(skb);
1669 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1670 *ppgr = pgr;
1671 return skb;
1672 }
1673
1674 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1675 skb_tailroom(skb)) : 0)
1676
1677 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1678 int type, int gdeleted, int sdeleted, int crsend)
1679 {
1680 struct inet6_dev *idev = pmc->idev;
1681 struct net_device *dev = idev->dev;
1682 struct mld2_report *pmr;
1683 struct mld2_grec *pgr = NULL;
1684 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1685 int scount, stotal, first, isquery, truncate;
1686
1687 if (pmc->mca_flags & MAF_NOREPORT)
1688 return skb;
1689
1690 isquery = type == MLD2_MODE_IS_INCLUDE ||
1691 type == MLD2_MODE_IS_EXCLUDE;
1692 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1693 type == MLD2_CHANGE_TO_EXCLUDE;
1694
1695 stotal = scount = 0;
1696
1697 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1698
1699 if (!*psf_list)
1700 goto empty_source;
1701
1702 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1703
1704 /* EX and TO_EX get a fresh packet, if needed */
1705 if (truncate) {
1706 if (pmr && pmr->mld2r_ngrec &&
1707 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1708 if (skb)
1709 mld_sendpack(skb);
1710 skb = mld_newpack(idev, dev->mtu);
1711 }
1712 }
1713 first = 1;
1714 psf_prev = NULL;
1715 for (psf=*psf_list; psf; psf=psf_next) {
1716 struct in6_addr *psrc;
1717
1718 psf_next = psf->sf_next;
1719
1720 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1721 psf_prev = psf;
1722 continue;
1723 }
1724
1725 /* clear marks on query responses */
1726 if (isquery)
1727 psf->sf_gsresp = 0;
1728
1729 if (AVAILABLE(skb) < sizeof(*psrc) +
1730 first*sizeof(struct mld2_grec)) {
1731 if (truncate && !first)
1732 break; /* truncate these */
1733 if (pgr)
1734 pgr->grec_nsrcs = htons(scount);
1735 if (skb)
1736 mld_sendpack(skb);
1737 skb = mld_newpack(idev, dev->mtu);
1738 first = 1;
1739 scount = 0;
1740 }
1741 if (first) {
1742 skb = add_grhead(skb, pmc, type, &pgr);
1743 first = 0;
1744 }
1745 if (!skb)
1746 return NULL;
1747 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1748 *psrc = psf->sf_addr;
1749 scount++; stotal++;
1750 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1751 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1752 psf->sf_crcount--;
1753 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1754 if (psf_prev)
1755 psf_prev->sf_next = psf->sf_next;
1756 else
1757 *psf_list = psf->sf_next;
1758 kfree(psf);
1759 continue;
1760 }
1761 }
1762 psf_prev = psf;
1763 }
1764
1765 empty_source:
1766 if (!stotal) {
1767 if (type == MLD2_ALLOW_NEW_SOURCES ||
1768 type == MLD2_BLOCK_OLD_SOURCES)
1769 return skb;
1770 if (pmc->mca_crcount || isquery || crsend) {
1771 /* make sure we have room for group header */
1772 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1773 mld_sendpack(skb);
1774 skb = NULL; /* add_grhead will get a new one */
1775 }
1776 skb = add_grhead(skb, pmc, type, &pgr);
1777 }
1778 }
1779 if (pgr)
1780 pgr->grec_nsrcs = htons(scount);
1781
1782 if (isquery)
1783 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1784 return skb;
1785 }
1786
1787 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1788 {
1789 struct sk_buff *skb = NULL;
1790 int type;
1791
1792 read_lock_bh(&idev->lock);
1793 if (!pmc) {
1794 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1795 if (pmc->mca_flags & MAF_NOREPORT)
1796 continue;
1797 spin_lock_bh(&pmc->mca_lock);
1798 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1799 type = MLD2_MODE_IS_EXCLUDE;
1800 else
1801 type = MLD2_MODE_IS_INCLUDE;
1802 skb = add_grec(skb, pmc, type, 0, 0, 0);
1803 spin_unlock_bh(&pmc->mca_lock);
1804 }
1805 } else {
1806 spin_lock_bh(&pmc->mca_lock);
1807 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1808 type = MLD2_MODE_IS_EXCLUDE;
1809 else
1810 type = MLD2_MODE_IS_INCLUDE;
1811 skb = add_grec(skb, pmc, type, 0, 0, 0);
1812 spin_unlock_bh(&pmc->mca_lock);
1813 }
1814 read_unlock_bh(&idev->lock);
1815 if (skb)
1816 mld_sendpack(skb);
1817 }
1818
1819 /*
1820 * remove zero-count source records from a source filter list
1821 */
1822 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1823 {
1824 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1825
1826 psf_prev = NULL;
1827 for (psf=*ppsf; psf; psf = psf_next) {
1828 psf_next = psf->sf_next;
1829 if (psf->sf_crcount == 0) {
1830 if (psf_prev)
1831 psf_prev->sf_next = psf->sf_next;
1832 else
1833 *ppsf = psf->sf_next;
1834 kfree(psf);
1835 } else
1836 psf_prev = psf;
1837 }
1838 }
1839
1840 static void mld_send_cr(struct inet6_dev *idev)
1841 {
1842 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1843 struct sk_buff *skb = NULL;
1844 int type, dtype;
1845
1846 read_lock_bh(&idev->lock);
1847 spin_lock(&idev->mc_lock);
1848
1849 /* deleted MCA's */
1850 pmc_prev = NULL;
1851 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1852 pmc_next = pmc->next;
1853 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1854 type = MLD2_BLOCK_OLD_SOURCES;
1855 dtype = MLD2_BLOCK_OLD_SOURCES;
1856 skb = add_grec(skb, pmc, type, 1, 0, 0);
1857 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1858 }
1859 if (pmc->mca_crcount) {
1860 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1861 type = MLD2_CHANGE_TO_INCLUDE;
1862 skb = add_grec(skb, pmc, type, 1, 0, 0);
1863 }
1864 pmc->mca_crcount--;
1865 if (pmc->mca_crcount == 0) {
1866 mld_clear_zeros(&pmc->mca_tomb);
1867 mld_clear_zeros(&pmc->mca_sources);
1868 }
1869 }
1870 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1871 !pmc->mca_sources) {
1872 if (pmc_prev)
1873 pmc_prev->next = pmc_next;
1874 else
1875 idev->mc_tomb = pmc_next;
1876 in6_dev_put(pmc->idev);
1877 kfree(pmc);
1878 } else
1879 pmc_prev = pmc;
1880 }
1881 spin_unlock(&idev->mc_lock);
1882
1883 /* change recs */
1884 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1885 spin_lock_bh(&pmc->mca_lock);
1886 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1887 type = MLD2_BLOCK_OLD_SOURCES;
1888 dtype = MLD2_ALLOW_NEW_SOURCES;
1889 } else {
1890 type = MLD2_ALLOW_NEW_SOURCES;
1891 dtype = MLD2_BLOCK_OLD_SOURCES;
1892 }
1893 skb = add_grec(skb, pmc, type, 0, 0, 0);
1894 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1895
1896 /* filter mode changes */
1897 if (pmc->mca_crcount) {
1898 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1899 type = MLD2_CHANGE_TO_EXCLUDE;
1900 else
1901 type = MLD2_CHANGE_TO_INCLUDE;
1902 skb = add_grec(skb, pmc, type, 0, 0, 0);
1903 pmc->mca_crcount--;
1904 }
1905 spin_unlock_bh(&pmc->mca_lock);
1906 }
1907 read_unlock_bh(&idev->lock);
1908 if (!skb)
1909 return;
1910 (void) mld_sendpack(skb);
1911 }
1912
1913 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1914 {
1915 struct net *net = dev_net(dev);
1916 struct sock *sk = net->ipv6.igmp_sk;
1917 struct inet6_dev *idev;
1918 struct sk_buff *skb;
1919 struct mld_msg *hdr;
1920 const struct in6_addr *snd_addr, *saddr;
1921 struct in6_addr addr_buf;
1922 int hlen = LL_RESERVED_SPACE(dev);
1923 int tlen = dev->needed_tailroom;
1924 int err, len, payload_len, full_len;
1925 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1926 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1927 IPV6_TLV_PADN, 0 };
1928 struct flowi6 fl6;
1929 struct dst_entry *dst;
1930
1931 if (type == ICMPV6_MGM_REDUCTION)
1932 snd_addr = &in6addr_linklocal_allrouters;
1933 else
1934 snd_addr = addr;
1935
1936 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1937 payload_len = len + sizeof(ra);
1938 full_len = sizeof(struct ipv6hdr) + payload_len;
1939
1940 rcu_read_lock();
1941 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1942 IPSTATS_MIB_OUT, full_len);
1943 rcu_read_unlock();
1944
1945 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1946
1947 if (skb == NULL) {
1948 rcu_read_lock();
1949 IP6_INC_STATS(net, __in6_dev_get(dev),
1950 IPSTATS_MIB_OUTDISCARDS);
1951 rcu_read_unlock();
1952 return;
1953 }
1954 skb->priority = TC_PRIO_CONTROL;
1955 skb_reserve(skb, hlen);
1956
1957 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1958 /* <draft-ietf-magma-mld-source-05.txt>:
1959 * use unspecified address as the source address
1960 * when a valid link-local address is not available.
1961 */
1962 saddr = &in6addr_any;
1963 } else
1964 saddr = &addr_buf;
1965
1966 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1967
1968 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1969
1970 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1971 memset(hdr, 0, sizeof(struct mld_msg));
1972 hdr->mld_type = type;
1973 hdr->mld_mca = *addr;
1974
1975 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1976 IPPROTO_ICMPV6,
1977 csum_partial(hdr, len, 0));
1978
1979 rcu_read_lock();
1980 idev = __in6_dev_get(skb->dev);
1981
1982 icmpv6_flow_init(sk, &fl6, type,
1983 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1984 skb->dev->ifindex);
1985 dst = icmp6_dst_alloc(skb->dev, &fl6);
1986 if (IS_ERR(dst)) {
1987 err = PTR_ERR(dst);
1988 goto err_out;
1989 }
1990
1991 skb_dst_set(skb, dst);
1992 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1993 dst_output);
1994 out:
1995 if (!err) {
1996 ICMP6MSGOUT_INC_STATS(net, idev, type);
1997 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1998 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1999 } else
2000 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2001
2002 rcu_read_unlock();
2003 return;
2004
2005 err_out:
2006 kfree_skb(skb);
2007 goto out;
2008 }
2009
2010 static void mld_send_initial_cr(struct inet6_dev *idev)
2011 {
2012 struct sk_buff *skb;
2013 struct ifmcaddr6 *pmc;
2014 int type;
2015
2016 if (mld_in_v1_mode(idev))
2017 return;
2018
2019 skb = NULL;
2020 read_lock_bh(&idev->lock);
2021 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2022 spin_lock_bh(&pmc->mca_lock);
2023 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2024 type = MLD2_CHANGE_TO_EXCLUDE;
2025 else
2026 type = MLD2_CHANGE_TO_INCLUDE;
2027 skb = add_grec(skb, pmc, type, 0, 0, 1);
2028 spin_unlock_bh(&pmc->mca_lock);
2029 }
2030 read_unlock_bh(&idev->lock);
2031 if (skb)
2032 mld_sendpack(skb);
2033 }
2034
2035 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2036 {
2037 idev->mc_dad_count = idev->mc_qrv;
2038 if (idev->mc_dad_count) {
2039 mld_send_initial_cr(idev);
2040 idev->mc_dad_count--;
2041 if (idev->mc_dad_count)
2042 mld_dad_start_timer(idev, idev->mc_maxdelay);
2043 }
2044 }
2045
2046 static void mld_dad_timer_expire(unsigned long data)
2047 {
2048 struct inet6_dev *idev = (struct inet6_dev *)data;
2049
2050 mld_send_initial_cr(idev);
2051 if (idev->mc_dad_count) {
2052 idev->mc_dad_count--;
2053 if (idev->mc_dad_count)
2054 mld_dad_start_timer(idev, idev->mc_maxdelay);
2055 }
2056 in6_dev_put(idev);
2057 }
2058
2059 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2060 const struct in6_addr *psfsrc)
2061 {
2062 struct ip6_sf_list *psf, *psf_prev;
2063 int rv = 0;
2064
2065 psf_prev = NULL;
2066 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2067 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2068 break;
2069 psf_prev = psf;
2070 }
2071 if (!psf || psf->sf_count[sfmode] == 0) {
2072 /* source filter not found, or count wrong => bug */
2073 return -ESRCH;
2074 }
2075 psf->sf_count[sfmode]--;
2076 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2077 struct inet6_dev *idev = pmc->idev;
2078
2079 /* no more filters for this source */
2080 if (psf_prev)
2081 psf_prev->sf_next = psf->sf_next;
2082 else
2083 pmc->mca_sources = psf->sf_next;
2084 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2085 !mld_in_v1_mode(idev)) {
2086 psf->sf_crcount = idev->mc_qrv;
2087 psf->sf_next = pmc->mca_tomb;
2088 pmc->mca_tomb = psf;
2089 rv = 1;
2090 } else
2091 kfree(psf);
2092 }
2093 return rv;
2094 }
2095
2096 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2097 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2098 int delta)
2099 {
2100 struct ifmcaddr6 *pmc;
2101 int changerec = 0;
2102 int i, err;
2103
2104 if (!idev)
2105 return -ENODEV;
2106 read_lock_bh(&idev->lock);
2107 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2108 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2109 break;
2110 }
2111 if (!pmc) {
2112 /* MCA not found?? bug */
2113 read_unlock_bh(&idev->lock);
2114 return -ESRCH;
2115 }
2116 spin_lock_bh(&pmc->mca_lock);
2117 sf_markstate(pmc);
2118 if (!delta) {
2119 if (!pmc->mca_sfcount[sfmode]) {
2120 spin_unlock_bh(&pmc->mca_lock);
2121 read_unlock_bh(&idev->lock);
2122 return -EINVAL;
2123 }
2124 pmc->mca_sfcount[sfmode]--;
2125 }
2126 err = 0;
2127 for (i=0; i<sfcount; i++) {
2128 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2129
2130 changerec |= rv > 0;
2131 if (!err && rv < 0)
2132 err = rv;
2133 }
2134 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2135 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2136 pmc->mca_sfcount[MCAST_INCLUDE]) {
2137 struct ip6_sf_list *psf;
2138
2139 /* filter mode change */
2140 pmc->mca_sfmode = MCAST_INCLUDE;
2141 pmc->mca_crcount = idev->mc_qrv;
2142 idev->mc_ifc_count = pmc->mca_crcount;
2143 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2144 psf->sf_crcount = 0;
2145 mld_ifc_event(pmc->idev);
2146 } else if (sf_setstate(pmc) || changerec)
2147 mld_ifc_event(pmc->idev);
2148 spin_unlock_bh(&pmc->mca_lock);
2149 read_unlock_bh(&idev->lock);
2150 return err;
2151 }
2152
2153 /*
2154 * Add multicast single-source filter to the interface list
2155 */
2156 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2157 const struct in6_addr *psfsrc)
2158 {
2159 struct ip6_sf_list *psf, *psf_prev;
2160
2161 psf_prev = NULL;
2162 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2163 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2164 break;
2165 psf_prev = psf;
2166 }
2167 if (!psf) {
2168 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2169 if (!psf)
2170 return -ENOBUFS;
2171
2172 psf->sf_addr = *psfsrc;
2173 if (psf_prev) {
2174 psf_prev->sf_next = psf;
2175 } else
2176 pmc->mca_sources = psf;
2177 }
2178 psf->sf_count[sfmode]++;
2179 return 0;
2180 }
2181
2182 static void sf_markstate(struct ifmcaddr6 *pmc)
2183 {
2184 struct ip6_sf_list *psf;
2185 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2186
2187 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2188 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2189 psf->sf_oldin = mca_xcount ==
2190 psf->sf_count[MCAST_EXCLUDE] &&
2191 !psf->sf_count[MCAST_INCLUDE];
2192 } else
2193 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2194 }
2195
2196 static int sf_setstate(struct ifmcaddr6 *pmc)
2197 {
2198 struct ip6_sf_list *psf, *dpsf;
2199 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2200 int qrv = pmc->idev->mc_qrv;
2201 int new_in, rv;
2202
2203 rv = 0;
2204 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2205 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2206 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2207 !psf->sf_count[MCAST_INCLUDE];
2208 } else
2209 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2210 if (new_in) {
2211 if (!psf->sf_oldin) {
2212 struct ip6_sf_list *prev = NULL;
2213
2214 for (dpsf=pmc->mca_tomb; dpsf;
2215 dpsf=dpsf->sf_next) {
2216 if (ipv6_addr_equal(&dpsf->sf_addr,
2217 &psf->sf_addr))
2218 break;
2219 prev = dpsf;
2220 }
2221 if (dpsf) {
2222 if (prev)
2223 prev->sf_next = dpsf->sf_next;
2224 else
2225 pmc->mca_tomb = dpsf->sf_next;
2226 kfree(dpsf);
2227 }
2228 psf->sf_crcount = qrv;
2229 rv++;
2230 }
2231 } else if (psf->sf_oldin) {
2232 psf->sf_crcount = 0;
2233 /*
2234 * add or update "delete" records if an active filter
2235 * is now inactive
2236 */
2237 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2238 if (ipv6_addr_equal(&dpsf->sf_addr,
2239 &psf->sf_addr))
2240 break;
2241 if (!dpsf) {
2242 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2243 if (!dpsf)
2244 continue;
2245 *dpsf = *psf;
2246 /* pmc->mca_lock held by callers */
2247 dpsf->sf_next = pmc->mca_tomb;
2248 pmc->mca_tomb = dpsf;
2249 }
2250 dpsf->sf_crcount = qrv;
2251 rv++;
2252 }
2253 }
2254 return rv;
2255 }
2256
2257 /*
2258 * Add multicast source filter list to the interface list
2259 */
2260 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2261 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2262 int delta)
2263 {
2264 struct ifmcaddr6 *pmc;
2265 int isexclude;
2266 int i, err;
2267
2268 if (!idev)
2269 return -ENODEV;
2270 read_lock_bh(&idev->lock);
2271 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2272 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2273 break;
2274 }
2275 if (!pmc) {
2276 /* MCA not found?? bug */
2277 read_unlock_bh(&idev->lock);
2278 return -ESRCH;
2279 }
2280 spin_lock_bh(&pmc->mca_lock);
2281
2282 sf_markstate(pmc);
2283 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2284 if (!delta)
2285 pmc->mca_sfcount[sfmode]++;
2286 err = 0;
2287 for (i=0; i<sfcount; i++) {
2288 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2289 if (err)
2290 break;
2291 }
2292 if (err) {
2293 int j;
2294
2295 if (!delta)
2296 pmc->mca_sfcount[sfmode]--;
2297 for (j=0; j<i; j++)
2298 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2299 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2300 struct ip6_sf_list *psf;
2301
2302 /* filter mode change */
2303 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2304 pmc->mca_sfmode = MCAST_EXCLUDE;
2305 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2306 pmc->mca_sfmode = MCAST_INCLUDE;
2307 /* else no filters; keep old mode for reports */
2308
2309 pmc->mca_crcount = idev->mc_qrv;
2310 idev->mc_ifc_count = pmc->mca_crcount;
2311 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2312 psf->sf_crcount = 0;
2313 mld_ifc_event(idev);
2314 } else if (sf_setstate(pmc))
2315 mld_ifc_event(idev);
2316 spin_unlock_bh(&pmc->mca_lock);
2317 read_unlock_bh(&idev->lock);
2318 return err;
2319 }
2320
2321 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2322 {
2323 struct ip6_sf_list *psf, *nextpsf;
2324
2325 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2326 nextpsf = psf->sf_next;
2327 kfree(psf);
2328 }
2329 pmc->mca_tomb = NULL;
2330 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2331 nextpsf = psf->sf_next;
2332 kfree(psf);
2333 }
2334 pmc->mca_sources = NULL;
2335 pmc->mca_sfmode = MCAST_EXCLUDE;
2336 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2337 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2338 }
2339
2340
2341 static void igmp6_join_group(struct ifmcaddr6 *ma)
2342 {
2343 unsigned long delay;
2344
2345 if (ma->mca_flags & MAF_NOREPORT)
2346 return;
2347
2348 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2349
2350 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2351
2352 spin_lock_bh(&ma->mca_lock);
2353 if (del_timer(&ma->mca_timer)) {
2354 atomic_dec(&ma->mca_refcnt);
2355 delay = ma->mca_timer.expires - jiffies;
2356 }
2357
2358 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2359 atomic_inc(&ma->mca_refcnt);
2360 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2361 spin_unlock_bh(&ma->mca_lock);
2362 }
2363
2364 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2365 struct inet6_dev *idev)
2366 {
2367 int err;
2368
2369 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2370 * so no other readers or writers of iml or its sflist
2371 */
2372 if (!iml->sflist) {
2373 /* any-source empty exclude case */
2374 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2375 }
2376 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2377 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2378 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2379 iml->sflist = NULL;
2380 return err;
2381 }
2382
2383 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2384 {
2385 if (mld_in_v1_mode(ma->idev)) {
2386 if (ma->mca_flags & MAF_LAST_REPORTER)
2387 igmp6_send(&ma->mca_addr, ma->idev->dev,
2388 ICMPV6_MGM_REDUCTION);
2389 } else {
2390 mld_add_delrec(ma->idev, ma);
2391 mld_ifc_event(ma->idev);
2392 }
2393 }
2394
2395 static void mld_gq_timer_expire(unsigned long data)
2396 {
2397 struct inet6_dev *idev = (struct inet6_dev *)data;
2398
2399 idev->mc_gq_running = 0;
2400 mld_send_report(idev, NULL);
2401 in6_dev_put(idev);
2402 }
2403
2404 static void mld_ifc_timer_expire(unsigned long data)
2405 {
2406 struct inet6_dev *idev = (struct inet6_dev *)data;
2407
2408 mld_send_cr(idev);
2409 if (idev->mc_ifc_count) {
2410 idev->mc_ifc_count--;
2411 if (idev->mc_ifc_count)
2412 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2413 }
2414 in6_dev_put(idev);
2415 }
2416
2417 static void mld_ifc_event(struct inet6_dev *idev)
2418 {
2419 if (mld_in_v1_mode(idev))
2420 return;
2421 idev->mc_ifc_count = idev->mc_qrv;
2422 mld_ifc_start_timer(idev, 1);
2423 }
2424
2425
2426 static void igmp6_timer_handler(unsigned long data)
2427 {
2428 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2429
2430 if (mld_in_v1_mode(ma->idev))
2431 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2432 else
2433 mld_send_report(ma->idev, ma);
2434
2435 spin_lock(&ma->mca_lock);
2436 ma->mca_flags |= MAF_LAST_REPORTER;
2437 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2438 spin_unlock(&ma->mca_lock);
2439 ma_put(ma);
2440 }
2441
2442 /* Device changing type */
2443
2444 void ipv6_mc_unmap(struct inet6_dev *idev)
2445 {
2446 struct ifmcaddr6 *i;
2447
2448 /* Install multicast list, except for all-nodes (already installed) */
2449
2450 read_lock_bh(&idev->lock);
2451 for (i = idev->mc_list; i; i = i->next)
2452 igmp6_group_dropped(i);
2453 read_unlock_bh(&idev->lock);
2454 }
2455
2456 void ipv6_mc_remap(struct inet6_dev *idev)
2457 {
2458 ipv6_mc_up(idev);
2459 }
2460
2461 /* Device going down */
2462
2463 void ipv6_mc_down(struct inet6_dev *idev)
2464 {
2465 struct ifmcaddr6 *i;
2466
2467 /* Withdraw multicast list */
2468
2469 read_lock_bh(&idev->lock);
2470 mld_ifc_stop_timer(idev);
2471 mld_gq_stop_timer(idev);
2472 mld_dad_stop_timer(idev);
2473
2474 for (i = idev->mc_list; i; i=i->next)
2475 igmp6_group_dropped(i);
2476 read_unlock_bh(&idev->lock);
2477
2478 mld_clear_delrec(idev);
2479 }
2480
2481
2482 /* Device going up */
2483
2484 void ipv6_mc_up(struct inet6_dev *idev)
2485 {
2486 struct ifmcaddr6 *i;
2487
2488 /* Install multicast list, except for all-nodes (already installed) */
2489
2490 read_lock_bh(&idev->lock);
2491 for (i = idev->mc_list; i; i=i->next)
2492 igmp6_group_added(i);
2493 read_unlock_bh(&idev->lock);
2494 }
2495
2496 /* IPv6 device initialization. */
2497
2498 void ipv6_mc_init_dev(struct inet6_dev *idev)
2499 {
2500 write_lock_bh(&idev->lock);
2501 spin_lock_init(&idev->mc_lock);
2502 idev->mc_gq_running = 0;
2503 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2504 (unsigned long)idev);
2505 idev->mc_tomb = NULL;
2506 idev->mc_ifc_count = 0;
2507 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2508 (unsigned long)idev);
2509 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2510 (unsigned long)idev);
2511
2512 idev->mc_qrv = MLD_QRV_DEFAULT;
2513 idev->mc_qi = MLD_QI_DEFAULT;
2514 idev->mc_qri = MLD_QRI_DEFAULT;
2515
2516 idev->mc_maxdelay = unsolicited_report_interval(idev);
2517 idev->mc_v1_seen = 0;
2518 write_unlock_bh(&idev->lock);
2519 }
2520
2521 /*
2522 * Device is about to be destroyed: clean up.
2523 */
2524
2525 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2526 {
2527 struct ifmcaddr6 *i;
2528
2529 /* Deactivate timers */
2530 ipv6_mc_down(idev);
2531
2532 /* Delete all-nodes address. */
2533 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2534 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2535 * fail.
2536 */
2537 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2538
2539 if (idev->cnf.forwarding)
2540 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2541
2542 write_lock_bh(&idev->lock);
2543 while ((i = idev->mc_list) != NULL) {
2544 idev->mc_list = i->next;
2545 write_unlock_bh(&idev->lock);
2546
2547 igmp6_group_dropped(i);
2548 ma_put(i);
2549
2550 write_lock_bh(&idev->lock);
2551 }
2552 write_unlock_bh(&idev->lock);
2553 }
2554
2555 #ifdef CONFIG_PROC_FS
2556 struct igmp6_mc_iter_state {
2557 struct seq_net_private p;
2558 struct net_device *dev;
2559 struct inet6_dev *idev;
2560 };
2561
2562 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2563
2564 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2565 {
2566 struct ifmcaddr6 *im = NULL;
2567 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2568 struct net *net = seq_file_net(seq);
2569
2570 state->idev = NULL;
2571 for_each_netdev_rcu(net, state->dev) {
2572 struct inet6_dev *idev;
2573 idev = __in6_dev_get(state->dev);
2574 if (!idev)
2575 continue;
2576 read_lock_bh(&idev->lock);
2577 im = idev->mc_list;
2578 if (im) {
2579 state->idev = idev;
2580 break;
2581 }
2582 read_unlock_bh(&idev->lock);
2583 }
2584 return im;
2585 }
2586
2587 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2588 {
2589 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2590
2591 im = im->next;
2592 while (!im) {
2593 if (likely(state->idev != NULL))
2594 read_unlock_bh(&state->idev->lock);
2595
2596 state->dev = next_net_device_rcu(state->dev);
2597 if (!state->dev) {
2598 state->idev = NULL;
2599 break;
2600 }
2601 state->idev = __in6_dev_get(state->dev);
2602 if (!state->idev)
2603 continue;
2604 read_lock_bh(&state->idev->lock);
2605 im = state->idev->mc_list;
2606 }
2607 return im;
2608 }
2609
2610 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2611 {
2612 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2613 if (im)
2614 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2615 --pos;
2616 return pos ? NULL : im;
2617 }
2618
2619 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2620 __acquires(RCU)
2621 {
2622 rcu_read_lock();
2623 return igmp6_mc_get_idx(seq, *pos);
2624 }
2625
2626 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2627 {
2628 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2629
2630 ++*pos;
2631 return im;
2632 }
2633
2634 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2635 __releases(RCU)
2636 {
2637 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2638
2639 if (likely(state->idev != NULL)) {
2640 read_unlock_bh(&state->idev->lock);
2641 state->idev = NULL;
2642 }
2643 state->dev = NULL;
2644 rcu_read_unlock();
2645 }
2646
2647 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2648 {
2649 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2650 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2651
2652 seq_printf(seq,
2653 "%-4d %-15s %pi6 %5d %08X %ld\n",
2654 state->dev->ifindex, state->dev->name,
2655 &im->mca_addr,
2656 im->mca_users, im->mca_flags,
2657 (im->mca_flags&MAF_TIMER_RUNNING) ?
2658 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2659 return 0;
2660 }
2661
2662 static const struct seq_operations igmp6_mc_seq_ops = {
2663 .start = igmp6_mc_seq_start,
2664 .next = igmp6_mc_seq_next,
2665 .stop = igmp6_mc_seq_stop,
2666 .show = igmp6_mc_seq_show,
2667 };
2668
2669 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2670 {
2671 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2672 sizeof(struct igmp6_mc_iter_state));
2673 }
2674
2675 static const struct file_operations igmp6_mc_seq_fops = {
2676 .owner = THIS_MODULE,
2677 .open = igmp6_mc_seq_open,
2678 .read = seq_read,
2679 .llseek = seq_lseek,
2680 .release = seq_release_net,
2681 };
2682
2683 struct igmp6_mcf_iter_state {
2684 struct seq_net_private p;
2685 struct net_device *dev;
2686 struct inet6_dev *idev;
2687 struct ifmcaddr6 *im;
2688 };
2689
2690 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2691
2692 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2693 {
2694 struct ip6_sf_list *psf = NULL;
2695 struct ifmcaddr6 *im = NULL;
2696 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2697 struct net *net = seq_file_net(seq);
2698
2699 state->idev = NULL;
2700 state->im = NULL;
2701 for_each_netdev_rcu(net, state->dev) {
2702 struct inet6_dev *idev;
2703 idev = __in6_dev_get(state->dev);
2704 if (unlikely(idev == NULL))
2705 continue;
2706 read_lock_bh(&idev->lock);
2707 im = idev->mc_list;
2708 if (likely(im != NULL)) {
2709 spin_lock_bh(&im->mca_lock);
2710 psf = im->mca_sources;
2711 if (likely(psf != NULL)) {
2712 state->im = im;
2713 state->idev = idev;
2714 break;
2715 }
2716 spin_unlock_bh(&im->mca_lock);
2717 }
2718 read_unlock_bh(&idev->lock);
2719 }
2720 return psf;
2721 }
2722
2723 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2724 {
2725 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2726
2727 psf = psf->sf_next;
2728 while (!psf) {
2729 spin_unlock_bh(&state->im->mca_lock);
2730 state->im = state->im->next;
2731 while (!state->im) {
2732 if (likely(state->idev != NULL))
2733 read_unlock_bh(&state->idev->lock);
2734
2735 state->dev = next_net_device_rcu(state->dev);
2736 if (!state->dev) {
2737 state->idev = NULL;
2738 goto out;
2739 }
2740 state->idev = __in6_dev_get(state->dev);
2741 if (!state->idev)
2742 continue;
2743 read_lock_bh(&state->idev->lock);
2744 state->im = state->idev->mc_list;
2745 }
2746 if (!state->im)
2747 break;
2748 spin_lock_bh(&state->im->mca_lock);
2749 psf = state->im->mca_sources;
2750 }
2751 out:
2752 return psf;
2753 }
2754
2755 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2756 {
2757 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2758 if (psf)
2759 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2760 --pos;
2761 return pos ? NULL : psf;
2762 }
2763
2764 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2765 __acquires(RCU)
2766 {
2767 rcu_read_lock();
2768 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2769 }
2770
2771 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2772 {
2773 struct ip6_sf_list *psf;
2774 if (v == SEQ_START_TOKEN)
2775 psf = igmp6_mcf_get_first(seq);
2776 else
2777 psf = igmp6_mcf_get_next(seq, v);
2778 ++*pos;
2779 return psf;
2780 }
2781
2782 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2783 __releases(RCU)
2784 {
2785 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2786 if (likely(state->im != NULL)) {
2787 spin_unlock_bh(&state->im->mca_lock);
2788 state->im = NULL;
2789 }
2790 if (likely(state->idev != NULL)) {
2791 read_unlock_bh(&state->idev->lock);
2792 state->idev = NULL;
2793 }
2794 state->dev = NULL;
2795 rcu_read_unlock();
2796 }
2797
2798 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2799 {
2800 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2801 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2802
2803 if (v == SEQ_START_TOKEN) {
2804 seq_printf(seq,
2805 "%3s %6s "
2806 "%32s %32s %6s %6s\n", "Idx",
2807 "Device", "Multicast Address",
2808 "Source Address", "INC", "EXC");
2809 } else {
2810 seq_printf(seq,
2811 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2812 state->dev->ifindex, state->dev->name,
2813 &state->im->mca_addr,
2814 &psf->sf_addr,
2815 psf->sf_count[MCAST_INCLUDE],
2816 psf->sf_count[MCAST_EXCLUDE]);
2817 }
2818 return 0;
2819 }
2820
2821 static const struct seq_operations igmp6_mcf_seq_ops = {
2822 .start = igmp6_mcf_seq_start,
2823 .next = igmp6_mcf_seq_next,
2824 .stop = igmp6_mcf_seq_stop,
2825 .show = igmp6_mcf_seq_show,
2826 };
2827
2828 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2829 {
2830 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2831 sizeof(struct igmp6_mcf_iter_state));
2832 }
2833
2834 static const struct file_operations igmp6_mcf_seq_fops = {
2835 .owner = THIS_MODULE,
2836 .open = igmp6_mcf_seq_open,
2837 .read = seq_read,
2838 .llseek = seq_lseek,
2839 .release = seq_release_net,
2840 };
2841
2842 static int __net_init igmp6_proc_init(struct net *net)
2843 {
2844 int err;
2845
2846 err = -ENOMEM;
2847 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2848 goto out;
2849 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2850 &igmp6_mcf_seq_fops))
2851 goto out_proc_net_igmp6;
2852
2853 err = 0;
2854 out:
2855 return err;
2856
2857 out_proc_net_igmp6:
2858 remove_proc_entry("igmp6", net->proc_net);
2859 goto out;
2860 }
2861
2862 static void __net_exit igmp6_proc_exit(struct net *net)
2863 {
2864 remove_proc_entry("mcfilter6", net->proc_net);
2865 remove_proc_entry("igmp6", net->proc_net);
2866 }
2867 #else
2868 static inline int igmp6_proc_init(struct net *net)
2869 {
2870 return 0;
2871 }
2872 static inline void igmp6_proc_exit(struct net *net)
2873 {
2874 }
2875 #endif
2876
2877 static int __net_init igmp6_net_init(struct net *net)
2878 {
2879 int err;
2880
2881 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2882 SOCK_RAW, IPPROTO_ICMPV6, net);
2883 if (err < 0) {
2884 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2885 err);
2886 goto out;
2887 }
2888
2889 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2890
2891 err = igmp6_proc_init(net);
2892 if (err)
2893 goto out_sock_create;
2894 out:
2895 return err;
2896
2897 out_sock_create:
2898 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2899 goto out;
2900 }
2901
2902 static void __net_exit igmp6_net_exit(struct net *net)
2903 {
2904 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2905 igmp6_proc_exit(net);
2906 }
2907
2908 static struct pernet_operations igmp6_net_ops = {
2909 .init = igmp6_net_init,
2910 .exit = igmp6_net_exit,
2911 };
2912
2913 int __init igmp6_init(void)
2914 {
2915 return register_pernet_subsys(&igmp6_net_ops);
2916 }
2917
2918 void igmp6_cleanup(void)
2919 {
2920 unregister_pernet_subsys(&igmp6_net_ops);
2921 }
Linux kernel - Deliverables
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