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net: ipv6: mld: implement RFC3810 MLDv2 mode only
[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 = net_random() % 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_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1010 {
1011 unsigned long tv = net_random() % delay;
1012
1013 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1014 in6_dev_hold(idev);
1015 }
1016
1017 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1018 {
1019 unsigned long tv = net_random() % delay;
1020
1021 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1022 in6_dev_hold(idev);
1023 }
1024
1025 /*
1026 * IGMP handling (alias multicast ICMPv6 messages)
1027 */
1028
1029 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1030 {
1031 unsigned long delay = resptime;
1032
1033 /* Do not start timer for these addresses */
1034 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1035 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1036 return;
1037
1038 if (del_timer(&ma->mca_timer)) {
1039 atomic_dec(&ma->mca_refcnt);
1040 delay = ma->mca_timer.expires - jiffies;
1041 }
1042
1043 if (delay >= resptime) {
1044 if (resptime)
1045 delay = net_random() % resptime;
1046 else
1047 delay = 1;
1048 }
1049 ma->mca_timer.expires = jiffies + delay;
1050 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1051 atomic_inc(&ma->mca_refcnt);
1052 ma->mca_flags |= MAF_TIMER_RUNNING;
1053 }
1054
1055 /* mark EXCLUDE-mode sources */
1056 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1057 const struct in6_addr *srcs)
1058 {
1059 struct ip6_sf_list *psf;
1060 int i, scount;
1061
1062 scount = 0;
1063 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1064 if (scount == nsrcs)
1065 break;
1066 for (i=0; i<nsrcs; i++) {
1067 /* skip inactive filters */
1068 if (psf->sf_count[MCAST_INCLUDE] ||
1069 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1070 psf->sf_count[MCAST_EXCLUDE])
1071 break;
1072 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1073 scount++;
1074 break;
1075 }
1076 }
1077 }
1078 pmc->mca_flags &= ~MAF_GSQUERY;
1079 if (scount == nsrcs) /* all sources excluded */
1080 return false;
1081 return true;
1082 }
1083
1084 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1085 const struct in6_addr *srcs)
1086 {
1087 struct ip6_sf_list *psf;
1088 int i, scount;
1089
1090 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1091 return mld_xmarksources(pmc, nsrcs, srcs);
1092
1093 /* mark INCLUDE-mode sources */
1094
1095 scount = 0;
1096 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1097 if (scount == nsrcs)
1098 break;
1099 for (i=0; i<nsrcs; i++) {
1100 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1101 psf->sf_gsresp = 1;
1102 scount++;
1103 break;
1104 }
1105 }
1106 }
1107 if (!scount) {
1108 pmc->mca_flags &= ~MAF_GSQUERY;
1109 return false;
1110 }
1111 pmc->mca_flags |= MAF_GSQUERY;
1112 return true;
1113 }
1114
1115 static int mld_force_mld_version(const struct inet6_dev *idev)
1116 {
1117 /* Normally, both are 0 here. If enforcement to a particular is
1118 * being used, individual device enforcement will have a lower
1119 * precedence over 'all' device (.../conf/all/force_mld_version).
1120 */
1121
1122 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1123 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1124 else
1125 return idev->cnf.force_mld_version;
1126 }
1127
1128 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1129 {
1130 return mld_force_mld_version(idev) == 2;
1131 }
1132
1133 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1134 {
1135 return mld_force_mld_version(idev) == 1;
1136 }
1137
1138 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1139 {
1140 if (mld_in_v2_mode_only(idev))
1141 return false;
1142 if (mld_in_v1_mode_only(idev))
1143 return true;
1144 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1145 return true;
1146
1147 return false;
1148 }
1149
1150 static void mld_set_v1_mode(struct inet6_dev *idev)
1151 {
1152 /* RFC3810, relevant sections:
1153 * - 9.1. Robustness Variable
1154 * - 9.2. Query Interval
1155 * - 9.3. Query Response Interval
1156 * - 9.12. Older Version Querier Present Timeout
1157 */
1158 unsigned long switchback;
1159
1160 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1161
1162 idev->mc_v1_seen = jiffies + switchback;
1163 }
1164
1165 static void mld_update_qrv(struct inet6_dev *idev,
1166 const struct mld2_query *mlh2)
1167 {
1168 /* RFC3810, relevant sections:
1169 * - 5.1.8. QRV (Querier's Robustness Variable)
1170 * - 9.1. Robustness Variable
1171 */
1172
1173 /* The value of the Robustness Variable MUST NOT be zero,
1174 * and SHOULD NOT be one. Catch this here if we ever run
1175 * into such a case in future.
1176 */
1177 WARN_ON(idev->mc_qrv == 0);
1178
1179 if (mlh2->mld2q_qrv > 0)
1180 idev->mc_qrv = mlh2->mld2q_qrv;
1181
1182 if (unlikely(idev->mc_qrv < 2)) {
1183 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1184 idev->mc_qrv, MLD_QRV_DEFAULT);
1185 idev->mc_qrv = MLD_QRV_DEFAULT;
1186 }
1187 }
1188
1189 static void mld_update_qi(struct inet6_dev *idev,
1190 const struct mld2_query *mlh2)
1191 {
1192 /* RFC3810, relevant sections:
1193 * - 5.1.9. QQIC (Querier's Query Interval Code)
1194 * - 9.2. Query Interval
1195 * - 9.12. Older Version Querier Present Timeout
1196 * (the [Query Interval] in the last Query received)
1197 */
1198 unsigned long mc_qqi;
1199
1200 if (mlh2->mld2q_qqic < 128) {
1201 mc_qqi = mlh2->mld2q_qqic;
1202 } else {
1203 unsigned long mc_man, mc_exp;
1204
1205 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1206 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1207
1208 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1209 }
1210
1211 idev->mc_qi = mc_qqi * HZ;
1212 }
1213
1214 static void mld_update_qri(struct inet6_dev *idev,
1215 const struct mld2_query *mlh2)
1216 {
1217 /* RFC3810, relevant sections:
1218 * - 5.1.3. Maximum Response Code
1219 * - 9.3. Query Response Interval
1220 */
1221 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1222 }
1223
1224 /* called with rcu_read_lock() */
1225 int igmp6_event_query(struct sk_buff *skb)
1226 {
1227 struct mld2_query *mlh2 = NULL;
1228 struct ifmcaddr6 *ma;
1229 const struct in6_addr *group;
1230 unsigned long max_delay;
1231 struct inet6_dev *idev;
1232 struct mld_msg *mld;
1233 int group_type;
1234 int mark = 0;
1235 int len;
1236
1237 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1238 return -EINVAL;
1239
1240 /* compute payload length excluding extension headers */
1241 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1242 len -= skb_network_header_len(skb);
1243
1244 /* Drop queries with not link local source */
1245 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1246 return -EINVAL;
1247
1248 idev = __in6_dev_get(skb->dev);
1249 if (idev == NULL)
1250 return 0;
1251
1252 mld = (struct mld_msg *)icmp6_hdr(skb);
1253 group = &mld->mld_mca;
1254 group_type = ipv6_addr_type(group);
1255
1256 if (group_type != IPV6_ADDR_ANY &&
1257 !(group_type&IPV6_ADDR_MULTICAST))
1258 return -EINVAL;
1259
1260 if (len == MLD_V1_QUERY_LEN) {
1261 /* Ignore v1 queries */
1262 if (mld_in_v2_mode_only(idev))
1263 return 0;
1264
1265 /* MLDv1 router present */
1266 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1267
1268 mld_set_v1_mode(idev);
1269
1270 /* cancel MLDv2 report timer */
1271 idev->mc_gq_running = 0;
1272 if (del_timer(&idev->mc_gq_timer))
1273 __in6_dev_put(idev);
1274
1275 /* cancel the interface change timer */
1276 idev->mc_ifc_count = 0;
1277 if (del_timer(&idev->mc_ifc_timer))
1278 __in6_dev_put(idev);
1279 /* clear deleted report items */
1280 mld_clear_delrec(idev);
1281 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1282 int srcs_offset = sizeof(struct mld2_query) -
1283 sizeof(struct icmp6hdr);
1284
1285 /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1286 if (mld_in_v1_mode(idev))
1287 return 0;
1288 if (!pskb_may_pull(skb, srcs_offset))
1289 return -EINVAL;
1290
1291 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1292
1293 max_delay = max(msecs_to_jiffies(mldv2_mrc(mlh2)), 1UL);
1294 idev->mc_maxdelay = max_delay;
1295
1296 mld_update_qrv(idev, mlh2);
1297 mld_update_qi(idev, mlh2);
1298 mld_update_qri(idev, mlh2);
1299
1300 if (group_type == IPV6_ADDR_ANY) { /* general query */
1301 if (mlh2->mld2q_nsrcs)
1302 return -EINVAL; /* no sources allowed */
1303
1304 mld_gq_start_timer(idev);
1305 return 0;
1306 }
1307 /* mark sources to include, if group & source-specific */
1308 if (mlh2->mld2q_nsrcs != 0) {
1309 if (!pskb_may_pull(skb, srcs_offset +
1310 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1311 return -EINVAL;
1312
1313 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1314 mark = 1;
1315 }
1316 } else
1317 return -EINVAL;
1318
1319 read_lock_bh(&idev->lock);
1320 if (group_type == IPV6_ADDR_ANY) {
1321 for (ma = idev->mc_list; ma; ma=ma->next) {
1322 spin_lock_bh(&ma->mca_lock);
1323 igmp6_group_queried(ma, max_delay);
1324 spin_unlock_bh(&ma->mca_lock);
1325 }
1326 } else {
1327 for (ma = idev->mc_list; ma; ma=ma->next) {
1328 if (!ipv6_addr_equal(group, &ma->mca_addr))
1329 continue;
1330 spin_lock_bh(&ma->mca_lock);
1331 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1332 /* gsquery <- gsquery && mark */
1333 if (!mark)
1334 ma->mca_flags &= ~MAF_GSQUERY;
1335 } else {
1336 /* gsquery <- mark */
1337 if (mark)
1338 ma->mca_flags |= MAF_GSQUERY;
1339 else
1340 ma->mca_flags &= ~MAF_GSQUERY;
1341 }
1342 if (!(ma->mca_flags & MAF_GSQUERY) ||
1343 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1344 igmp6_group_queried(ma, max_delay);
1345 spin_unlock_bh(&ma->mca_lock);
1346 break;
1347 }
1348 }
1349 read_unlock_bh(&idev->lock);
1350
1351 return 0;
1352 }
1353
1354 /* called with rcu_read_lock() */
1355 int igmp6_event_report(struct sk_buff *skb)
1356 {
1357 struct ifmcaddr6 *ma;
1358 struct inet6_dev *idev;
1359 struct mld_msg *mld;
1360 int addr_type;
1361
1362 /* Our own report looped back. Ignore it. */
1363 if (skb->pkt_type == PACKET_LOOPBACK)
1364 return 0;
1365
1366 /* send our report if the MC router may not have heard this report */
1367 if (skb->pkt_type != PACKET_MULTICAST &&
1368 skb->pkt_type != PACKET_BROADCAST)
1369 return 0;
1370
1371 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1372 return -EINVAL;
1373
1374 mld = (struct mld_msg *)icmp6_hdr(skb);
1375
1376 /* Drop reports with not link local source */
1377 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1378 if (addr_type != IPV6_ADDR_ANY &&
1379 !(addr_type&IPV6_ADDR_LINKLOCAL))
1380 return -EINVAL;
1381
1382 idev = __in6_dev_get(skb->dev);
1383 if (idev == NULL)
1384 return -ENODEV;
1385
1386 /*
1387 * Cancel the timer for this group
1388 */
1389
1390 read_lock_bh(&idev->lock);
1391 for (ma = idev->mc_list; ma; ma=ma->next) {
1392 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1393 spin_lock(&ma->mca_lock);
1394 if (del_timer(&ma->mca_timer))
1395 atomic_dec(&ma->mca_refcnt);
1396 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1397 spin_unlock(&ma->mca_lock);
1398 break;
1399 }
1400 }
1401 read_unlock_bh(&idev->lock);
1402 return 0;
1403 }
1404
1405 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1406 int gdeleted, int sdeleted)
1407 {
1408 switch (type) {
1409 case MLD2_MODE_IS_INCLUDE:
1410 case MLD2_MODE_IS_EXCLUDE:
1411 if (gdeleted || sdeleted)
1412 return false;
1413 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1414 if (pmc->mca_sfmode == MCAST_INCLUDE)
1415 return true;
1416 /* don't include if this source is excluded
1417 * in all filters
1418 */
1419 if (psf->sf_count[MCAST_INCLUDE])
1420 return type == MLD2_MODE_IS_INCLUDE;
1421 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1422 psf->sf_count[MCAST_EXCLUDE];
1423 }
1424 return false;
1425 case MLD2_CHANGE_TO_INCLUDE:
1426 if (gdeleted || sdeleted)
1427 return false;
1428 return psf->sf_count[MCAST_INCLUDE] != 0;
1429 case MLD2_CHANGE_TO_EXCLUDE:
1430 if (gdeleted || sdeleted)
1431 return false;
1432 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1433 psf->sf_count[MCAST_INCLUDE])
1434 return false;
1435 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1436 psf->sf_count[MCAST_EXCLUDE];
1437 case MLD2_ALLOW_NEW_SOURCES:
1438 if (gdeleted || !psf->sf_crcount)
1439 return false;
1440 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1441 case MLD2_BLOCK_OLD_SOURCES:
1442 if (pmc->mca_sfmode == MCAST_INCLUDE)
1443 return gdeleted || (psf->sf_crcount && sdeleted);
1444 return psf->sf_crcount && !gdeleted && !sdeleted;
1445 }
1446 return false;
1447 }
1448
1449 static int
1450 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1451 {
1452 struct ip6_sf_list *psf;
1453 int scount = 0;
1454
1455 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1456 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1457 continue;
1458 scount++;
1459 }
1460 return scount;
1461 }
1462
1463 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1464 struct net_device *dev,
1465 const struct in6_addr *saddr,
1466 const struct in6_addr *daddr,
1467 int proto, int len)
1468 {
1469 struct ipv6hdr *hdr;
1470
1471 skb->protocol = htons(ETH_P_IPV6);
1472 skb->dev = dev;
1473
1474 skb_reset_network_header(skb);
1475 skb_put(skb, sizeof(struct ipv6hdr));
1476 hdr = ipv6_hdr(skb);
1477
1478 ip6_flow_hdr(hdr, 0, 0);
1479
1480 hdr->payload_len = htons(len);
1481 hdr->nexthdr = proto;
1482 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1483
1484 hdr->saddr = *saddr;
1485 hdr->daddr = *daddr;
1486 }
1487
1488 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1489 {
1490 struct net_device *dev = idev->dev;
1491 struct net *net = dev_net(dev);
1492 struct sock *sk = net->ipv6.igmp_sk;
1493 struct sk_buff *skb;
1494 struct mld2_report *pmr;
1495 struct in6_addr addr_buf;
1496 const struct in6_addr *saddr;
1497 int hlen = LL_RESERVED_SPACE(dev);
1498 int tlen = dev->needed_tailroom;
1499 int err;
1500 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1501 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1502 IPV6_TLV_PADN, 0 };
1503
1504 /* we assume size > sizeof(ra) here */
1505 size += hlen + tlen;
1506 /* limit our allocations to order-0 page */
1507 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1508 skb = sock_alloc_send_skb(sk, size, 1, &err);
1509
1510 if (!skb)
1511 return NULL;
1512
1513 skb->priority = TC_PRIO_CONTROL;
1514 skb_reserve(skb, hlen);
1515
1516 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1517 /* <draft-ietf-magma-mld-source-05.txt>:
1518 * use unspecified address as the source address
1519 * when a valid link-local address is not available.
1520 */
1521 saddr = &in6addr_any;
1522 } else
1523 saddr = &addr_buf;
1524
1525 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1526
1527 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1528
1529 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1530 skb_put(skb, sizeof(*pmr));
1531 pmr = (struct mld2_report *)skb_transport_header(skb);
1532 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1533 pmr->mld2r_resv1 = 0;
1534 pmr->mld2r_cksum = 0;
1535 pmr->mld2r_resv2 = 0;
1536 pmr->mld2r_ngrec = 0;
1537 return skb;
1538 }
1539
1540 static void mld_sendpack(struct sk_buff *skb)
1541 {
1542 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1543 struct mld2_report *pmr =
1544 (struct mld2_report *)skb_transport_header(skb);
1545 int payload_len, mldlen;
1546 struct inet6_dev *idev;
1547 struct net *net = dev_net(skb->dev);
1548 int err;
1549 struct flowi6 fl6;
1550 struct dst_entry *dst;
1551
1552 rcu_read_lock();
1553 idev = __in6_dev_get(skb->dev);
1554 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1555
1556 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1557 sizeof(*pip6);
1558 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1559 pip6->payload_len = htons(payload_len);
1560
1561 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1562 IPPROTO_ICMPV6,
1563 csum_partial(skb_transport_header(skb),
1564 mldlen, 0));
1565
1566 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1567 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1568 skb->dev->ifindex);
1569 dst = icmp6_dst_alloc(skb->dev, &fl6);
1570
1571 err = 0;
1572 if (IS_ERR(dst)) {
1573 err = PTR_ERR(dst);
1574 dst = NULL;
1575 }
1576 skb_dst_set(skb, dst);
1577 if (err)
1578 goto err_out;
1579
1580 payload_len = skb->len;
1581
1582 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1583 dst_output);
1584 out:
1585 if (!err) {
1586 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1587 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1588 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1589 } else
1590 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1591
1592 rcu_read_unlock();
1593 return;
1594
1595 err_out:
1596 kfree_skb(skb);
1597 goto out;
1598 }
1599
1600 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1601 {
1602 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1603 }
1604
1605 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1606 int type, struct mld2_grec **ppgr)
1607 {
1608 struct net_device *dev = pmc->idev->dev;
1609 struct mld2_report *pmr;
1610 struct mld2_grec *pgr;
1611
1612 if (!skb)
1613 skb = mld_newpack(pmc->idev, dev->mtu);
1614 if (!skb)
1615 return NULL;
1616 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1617 pgr->grec_type = type;
1618 pgr->grec_auxwords = 0;
1619 pgr->grec_nsrcs = 0;
1620 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1621 pmr = (struct mld2_report *)skb_transport_header(skb);
1622 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1623 *ppgr = pgr;
1624 return skb;
1625 }
1626
1627 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1628 skb_tailroom(skb)) : 0)
1629
1630 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1631 int type, int gdeleted, int sdeleted)
1632 {
1633 struct inet6_dev *idev = pmc->idev;
1634 struct net_device *dev = idev->dev;
1635 struct mld2_report *pmr;
1636 struct mld2_grec *pgr = NULL;
1637 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1638 int scount, stotal, first, isquery, truncate;
1639
1640 if (pmc->mca_flags & MAF_NOREPORT)
1641 return skb;
1642
1643 isquery = type == MLD2_MODE_IS_INCLUDE ||
1644 type == MLD2_MODE_IS_EXCLUDE;
1645 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1646 type == MLD2_CHANGE_TO_EXCLUDE;
1647
1648 stotal = scount = 0;
1649
1650 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1651
1652 if (!*psf_list)
1653 goto empty_source;
1654
1655 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1656
1657 /* EX and TO_EX get a fresh packet, if needed */
1658 if (truncate) {
1659 if (pmr && pmr->mld2r_ngrec &&
1660 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1661 if (skb)
1662 mld_sendpack(skb);
1663 skb = mld_newpack(idev, dev->mtu);
1664 }
1665 }
1666 first = 1;
1667 psf_prev = NULL;
1668 for (psf=*psf_list; psf; psf=psf_next) {
1669 struct in6_addr *psrc;
1670
1671 psf_next = psf->sf_next;
1672
1673 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1674 psf_prev = psf;
1675 continue;
1676 }
1677
1678 /* clear marks on query responses */
1679 if (isquery)
1680 psf->sf_gsresp = 0;
1681
1682 if (AVAILABLE(skb) < sizeof(*psrc) +
1683 first*sizeof(struct mld2_grec)) {
1684 if (truncate && !first)
1685 break; /* truncate these */
1686 if (pgr)
1687 pgr->grec_nsrcs = htons(scount);
1688 if (skb)
1689 mld_sendpack(skb);
1690 skb = mld_newpack(idev, dev->mtu);
1691 first = 1;
1692 scount = 0;
1693 }
1694 if (first) {
1695 skb = add_grhead(skb, pmc, type, &pgr);
1696 first = 0;
1697 }
1698 if (!skb)
1699 return NULL;
1700 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1701 *psrc = psf->sf_addr;
1702 scount++; stotal++;
1703 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1704 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1705 psf->sf_crcount--;
1706 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1707 if (psf_prev)
1708 psf_prev->sf_next = psf->sf_next;
1709 else
1710 *psf_list = psf->sf_next;
1711 kfree(psf);
1712 continue;
1713 }
1714 }
1715 psf_prev = psf;
1716 }
1717
1718 empty_source:
1719 if (!stotal) {
1720 if (type == MLD2_ALLOW_NEW_SOURCES ||
1721 type == MLD2_BLOCK_OLD_SOURCES)
1722 return skb;
1723 if (pmc->mca_crcount || isquery) {
1724 /* make sure we have room for group header */
1725 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1726 mld_sendpack(skb);
1727 skb = NULL; /* add_grhead will get a new one */
1728 }
1729 skb = add_grhead(skb, pmc, type, &pgr);
1730 }
1731 }
1732 if (pgr)
1733 pgr->grec_nsrcs = htons(scount);
1734
1735 if (isquery)
1736 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1737 return skb;
1738 }
1739
1740 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1741 {
1742 struct sk_buff *skb = NULL;
1743 int type;
1744
1745 read_lock_bh(&idev->lock);
1746 if (!pmc) {
1747 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1748 if (pmc->mca_flags & MAF_NOREPORT)
1749 continue;
1750 spin_lock_bh(&pmc->mca_lock);
1751 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1752 type = MLD2_MODE_IS_EXCLUDE;
1753 else
1754 type = MLD2_MODE_IS_INCLUDE;
1755 skb = add_grec(skb, pmc, type, 0, 0);
1756 spin_unlock_bh(&pmc->mca_lock);
1757 }
1758 } else {
1759 spin_lock_bh(&pmc->mca_lock);
1760 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1761 type = MLD2_MODE_IS_EXCLUDE;
1762 else
1763 type = MLD2_MODE_IS_INCLUDE;
1764 skb = add_grec(skb, pmc, type, 0, 0);
1765 spin_unlock_bh(&pmc->mca_lock);
1766 }
1767 read_unlock_bh(&idev->lock);
1768 if (skb)
1769 mld_sendpack(skb);
1770 }
1771
1772 /*
1773 * remove zero-count source records from a source filter list
1774 */
1775 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1776 {
1777 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1778
1779 psf_prev = NULL;
1780 for (psf=*ppsf; psf; psf = psf_next) {
1781 psf_next = psf->sf_next;
1782 if (psf->sf_crcount == 0) {
1783 if (psf_prev)
1784 psf_prev->sf_next = psf->sf_next;
1785 else
1786 *ppsf = psf->sf_next;
1787 kfree(psf);
1788 } else
1789 psf_prev = psf;
1790 }
1791 }
1792
1793 static void mld_send_cr(struct inet6_dev *idev)
1794 {
1795 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1796 struct sk_buff *skb = NULL;
1797 int type, dtype;
1798
1799 read_lock_bh(&idev->lock);
1800 spin_lock(&idev->mc_lock);
1801
1802 /* deleted MCA's */
1803 pmc_prev = NULL;
1804 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1805 pmc_next = pmc->next;
1806 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1807 type = MLD2_BLOCK_OLD_SOURCES;
1808 dtype = MLD2_BLOCK_OLD_SOURCES;
1809 skb = add_grec(skb, pmc, type, 1, 0);
1810 skb = add_grec(skb, pmc, dtype, 1, 1);
1811 }
1812 if (pmc->mca_crcount) {
1813 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1814 type = MLD2_CHANGE_TO_INCLUDE;
1815 skb = add_grec(skb, pmc, type, 1, 0);
1816 }
1817 pmc->mca_crcount--;
1818 if (pmc->mca_crcount == 0) {
1819 mld_clear_zeros(&pmc->mca_tomb);
1820 mld_clear_zeros(&pmc->mca_sources);
1821 }
1822 }
1823 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1824 !pmc->mca_sources) {
1825 if (pmc_prev)
1826 pmc_prev->next = pmc_next;
1827 else
1828 idev->mc_tomb = pmc_next;
1829 in6_dev_put(pmc->idev);
1830 kfree(pmc);
1831 } else
1832 pmc_prev = pmc;
1833 }
1834 spin_unlock(&idev->mc_lock);
1835
1836 /* change recs */
1837 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1838 spin_lock_bh(&pmc->mca_lock);
1839 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1840 type = MLD2_BLOCK_OLD_SOURCES;
1841 dtype = MLD2_ALLOW_NEW_SOURCES;
1842 } else {
1843 type = MLD2_ALLOW_NEW_SOURCES;
1844 dtype = MLD2_BLOCK_OLD_SOURCES;
1845 }
1846 skb = add_grec(skb, pmc, type, 0, 0);
1847 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1848
1849 /* filter mode changes */
1850 if (pmc->mca_crcount) {
1851 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1852 type = MLD2_CHANGE_TO_EXCLUDE;
1853 else
1854 type = MLD2_CHANGE_TO_INCLUDE;
1855 skb = add_grec(skb, pmc, type, 0, 0);
1856 pmc->mca_crcount--;
1857 }
1858 spin_unlock_bh(&pmc->mca_lock);
1859 }
1860 read_unlock_bh(&idev->lock);
1861 if (!skb)
1862 return;
1863 (void) mld_sendpack(skb);
1864 }
1865
1866 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1867 {
1868 struct net *net = dev_net(dev);
1869 struct sock *sk = net->ipv6.igmp_sk;
1870 struct inet6_dev *idev;
1871 struct sk_buff *skb;
1872 struct mld_msg *hdr;
1873 const struct in6_addr *snd_addr, *saddr;
1874 struct in6_addr addr_buf;
1875 int hlen = LL_RESERVED_SPACE(dev);
1876 int tlen = dev->needed_tailroom;
1877 int err, len, payload_len, full_len;
1878 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1879 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1880 IPV6_TLV_PADN, 0 };
1881 struct flowi6 fl6;
1882 struct dst_entry *dst;
1883
1884 if (type == ICMPV6_MGM_REDUCTION)
1885 snd_addr = &in6addr_linklocal_allrouters;
1886 else
1887 snd_addr = addr;
1888
1889 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1890 payload_len = len + sizeof(ra);
1891 full_len = sizeof(struct ipv6hdr) + payload_len;
1892
1893 rcu_read_lock();
1894 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1895 IPSTATS_MIB_OUT, full_len);
1896 rcu_read_unlock();
1897
1898 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1899
1900 if (skb == NULL) {
1901 rcu_read_lock();
1902 IP6_INC_STATS(net, __in6_dev_get(dev),
1903 IPSTATS_MIB_OUTDISCARDS);
1904 rcu_read_unlock();
1905 return;
1906 }
1907 skb->priority = TC_PRIO_CONTROL;
1908 skb_reserve(skb, hlen);
1909
1910 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1911 /* <draft-ietf-magma-mld-source-05.txt>:
1912 * use unspecified address as the source address
1913 * when a valid link-local address is not available.
1914 */
1915 saddr = &in6addr_any;
1916 } else
1917 saddr = &addr_buf;
1918
1919 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1920
1921 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1922
1923 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1924 memset(hdr, 0, sizeof(struct mld_msg));
1925 hdr->mld_type = type;
1926 hdr->mld_mca = *addr;
1927
1928 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1929 IPPROTO_ICMPV6,
1930 csum_partial(hdr, len, 0));
1931
1932 rcu_read_lock();
1933 idev = __in6_dev_get(skb->dev);
1934
1935 icmpv6_flow_init(sk, &fl6, type,
1936 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1937 skb->dev->ifindex);
1938 dst = icmp6_dst_alloc(skb->dev, &fl6);
1939 if (IS_ERR(dst)) {
1940 err = PTR_ERR(dst);
1941 goto err_out;
1942 }
1943
1944 skb_dst_set(skb, dst);
1945 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1946 dst_output);
1947 out:
1948 if (!err) {
1949 ICMP6MSGOUT_INC_STATS(net, idev, type);
1950 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1951 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1952 } else
1953 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1954
1955 rcu_read_unlock();
1956 return;
1957
1958 err_out:
1959 kfree_skb(skb);
1960 goto out;
1961 }
1962
1963 static void mld_resend_report(struct inet6_dev *idev)
1964 {
1965 if (mld_in_v1_mode(idev)) {
1966 struct ifmcaddr6 *mcaddr;
1967 read_lock_bh(&idev->lock);
1968 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1969 if (!(mcaddr->mca_flags & MAF_NOREPORT))
1970 igmp6_send(&mcaddr->mca_addr, idev->dev,
1971 ICMPV6_MGM_REPORT);
1972 }
1973 read_unlock_bh(&idev->lock);
1974 } else {
1975 mld_send_report(idev, NULL);
1976 }
1977 }
1978
1979 void ipv6_mc_dad_complete(struct inet6_dev *idev)
1980 {
1981 idev->mc_dad_count = idev->mc_qrv;
1982 if (idev->mc_dad_count) {
1983 mld_resend_report(idev);
1984 idev->mc_dad_count--;
1985 if (idev->mc_dad_count)
1986 mld_dad_start_timer(idev, idev->mc_maxdelay);
1987 }
1988 }
1989
1990 static void mld_dad_timer_expire(unsigned long data)
1991 {
1992 struct inet6_dev *idev = (struct inet6_dev *)data;
1993
1994 mld_resend_report(idev);
1995 if (idev->mc_dad_count) {
1996 idev->mc_dad_count--;
1997 if (idev->mc_dad_count)
1998 mld_dad_start_timer(idev, idev->mc_maxdelay);
1999 }
2000 __in6_dev_put(idev);
2001 }
2002
2003 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2004 const struct in6_addr *psfsrc)
2005 {
2006 struct ip6_sf_list *psf, *psf_prev;
2007 int rv = 0;
2008
2009 psf_prev = NULL;
2010 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2011 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2012 break;
2013 psf_prev = psf;
2014 }
2015 if (!psf || psf->sf_count[sfmode] == 0) {
2016 /* source filter not found, or count wrong => bug */
2017 return -ESRCH;
2018 }
2019 psf->sf_count[sfmode]--;
2020 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2021 struct inet6_dev *idev = pmc->idev;
2022
2023 /* no more filters for this source */
2024 if (psf_prev)
2025 psf_prev->sf_next = psf->sf_next;
2026 else
2027 pmc->mca_sources = psf->sf_next;
2028 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2029 !mld_in_v1_mode(idev)) {
2030 psf->sf_crcount = idev->mc_qrv;
2031 psf->sf_next = pmc->mca_tomb;
2032 pmc->mca_tomb = psf;
2033 rv = 1;
2034 } else
2035 kfree(psf);
2036 }
2037 return rv;
2038 }
2039
2040 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2041 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2042 int delta)
2043 {
2044 struct ifmcaddr6 *pmc;
2045 int changerec = 0;
2046 int i, err;
2047
2048 if (!idev)
2049 return -ENODEV;
2050 read_lock_bh(&idev->lock);
2051 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2052 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2053 break;
2054 }
2055 if (!pmc) {
2056 /* MCA not found?? bug */
2057 read_unlock_bh(&idev->lock);
2058 return -ESRCH;
2059 }
2060 spin_lock_bh(&pmc->mca_lock);
2061 sf_markstate(pmc);
2062 if (!delta) {
2063 if (!pmc->mca_sfcount[sfmode]) {
2064 spin_unlock_bh(&pmc->mca_lock);
2065 read_unlock_bh(&idev->lock);
2066 return -EINVAL;
2067 }
2068 pmc->mca_sfcount[sfmode]--;
2069 }
2070 err = 0;
2071 for (i=0; i<sfcount; i++) {
2072 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2073
2074 changerec |= rv > 0;
2075 if (!err && rv < 0)
2076 err = rv;
2077 }
2078 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2079 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2080 pmc->mca_sfcount[MCAST_INCLUDE]) {
2081 struct ip6_sf_list *psf;
2082
2083 /* filter mode change */
2084 pmc->mca_sfmode = MCAST_INCLUDE;
2085 pmc->mca_crcount = idev->mc_qrv;
2086 idev->mc_ifc_count = pmc->mca_crcount;
2087 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2088 psf->sf_crcount = 0;
2089 mld_ifc_event(pmc->idev);
2090 } else if (sf_setstate(pmc) || changerec)
2091 mld_ifc_event(pmc->idev);
2092 spin_unlock_bh(&pmc->mca_lock);
2093 read_unlock_bh(&idev->lock);
2094 return err;
2095 }
2096
2097 /*
2098 * Add multicast single-source filter to the interface list
2099 */
2100 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2101 const struct in6_addr *psfsrc)
2102 {
2103 struct ip6_sf_list *psf, *psf_prev;
2104
2105 psf_prev = NULL;
2106 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2107 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2108 break;
2109 psf_prev = psf;
2110 }
2111 if (!psf) {
2112 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2113 if (!psf)
2114 return -ENOBUFS;
2115
2116 psf->sf_addr = *psfsrc;
2117 if (psf_prev) {
2118 psf_prev->sf_next = psf;
2119 } else
2120 pmc->mca_sources = psf;
2121 }
2122 psf->sf_count[sfmode]++;
2123 return 0;
2124 }
2125
2126 static void sf_markstate(struct ifmcaddr6 *pmc)
2127 {
2128 struct ip6_sf_list *psf;
2129 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2130
2131 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2132 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2133 psf->sf_oldin = mca_xcount ==
2134 psf->sf_count[MCAST_EXCLUDE] &&
2135 !psf->sf_count[MCAST_INCLUDE];
2136 } else
2137 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2138 }
2139
2140 static int sf_setstate(struct ifmcaddr6 *pmc)
2141 {
2142 struct ip6_sf_list *psf, *dpsf;
2143 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2144 int qrv = pmc->idev->mc_qrv;
2145 int new_in, rv;
2146
2147 rv = 0;
2148 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2149 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2150 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2151 !psf->sf_count[MCAST_INCLUDE];
2152 } else
2153 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2154 if (new_in) {
2155 if (!psf->sf_oldin) {
2156 struct ip6_sf_list *prev = NULL;
2157
2158 for (dpsf=pmc->mca_tomb; dpsf;
2159 dpsf=dpsf->sf_next) {
2160 if (ipv6_addr_equal(&dpsf->sf_addr,
2161 &psf->sf_addr))
2162 break;
2163 prev = dpsf;
2164 }
2165 if (dpsf) {
2166 if (prev)
2167 prev->sf_next = dpsf->sf_next;
2168 else
2169 pmc->mca_tomb = dpsf->sf_next;
2170 kfree(dpsf);
2171 }
2172 psf->sf_crcount = qrv;
2173 rv++;
2174 }
2175 } else if (psf->sf_oldin) {
2176 psf->sf_crcount = 0;
2177 /*
2178 * add or update "delete" records if an active filter
2179 * is now inactive
2180 */
2181 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2182 if (ipv6_addr_equal(&dpsf->sf_addr,
2183 &psf->sf_addr))
2184 break;
2185 if (!dpsf) {
2186 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2187 if (!dpsf)
2188 continue;
2189 *dpsf = *psf;
2190 /* pmc->mca_lock held by callers */
2191 dpsf->sf_next = pmc->mca_tomb;
2192 pmc->mca_tomb = dpsf;
2193 }
2194 dpsf->sf_crcount = qrv;
2195 rv++;
2196 }
2197 }
2198 return rv;
2199 }
2200
2201 /*
2202 * Add multicast source filter list to the interface list
2203 */
2204 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2205 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2206 int delta)
2207 {
2208 struct ifmcaddr6 *pmc;
2209 int isexclude;
2210 int i, err;
2211
2212 if (!idev)
2213 return -ENODEV;
2214 read_lock_bh(&idev->lock);
2215 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2216 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2217 break;
2218 }
2219 if (!pmc) {
2220 /* MCA not found?? bug */
2221 read_unlock_bh(&idev->lock);
2222 return -ESRCH;
2223 }
2224 spin_lock_bh(&pmc->mca_lock);
2225
2226 sf_markstate(pmc);
2227 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2228 if (!delta)
2229 pmc->mca_sfcount[sfmode]++;
2230 err = 0;
2231 for (i=0; i<sfcount; i++) {
2232 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2233 if (err)
2234 break;
2235 }
2236 if (err) {
2237 int j;
2238
2239 if (!delta)
2240 pmc->mca_sfcount[sfmode]--;
2241 for (j=0; j<i; j++)
2242 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2243 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2244 struct ip6_sf_list *psf;
2245
2246 /* filter mode change */
2247 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2248 pmc->mca_sfmode = MCAST_EXCLUDE;
2249 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2250 pmc->mca_sfmode = MCAST_INCLUDE;
2251 /* else no filters; keep old mode for reports */
2252
2253 pmc->mca_crcount = idev->mc_qrv;
2254 idev->mc_ifc_count = pmc->mca_crcount;
2255 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2256 psf->sf_crcount = 0;
2257 mld_ifc_event(idev);
2258 } else if (sf_setstate(pmc))
2259 mld_ifc_event(idev);
2260 spin_unlock_bh(&pmc->mca_lock);
2261 read_unlock_bh(&idev->lock);
2262 return err;
2263 }
2264
2265 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2266 {
2267 struct ip6_sf_list *psf, *nextpsf;
2268
2269 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2270 nextpsf = psf->sf_next;
2271 kfree(psf);
2272 }
2273 pmc->mca_tomb = NULL;
2274 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2275 nextpsf = psf->sf_next;
2276 kfree(psf);
2277 }
2278 pmc->mca_sources = NULL;
2279 pmc->mca_sfmode = MCAST_EXCLUDE;
2280 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2281 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2282 }
2283
2284
2285 static void igmp6_join_group(struct ifmcaddr6 *ma)
2286 {
2287 unsigned long delay;
2288
2289 if (ma->mca_flags & MAF_NOREPORT)
2290 return;
2291
2292 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2293
2294 delay = net_random() % unsolicited_report_interval(ma->idev);
2295
2296 spin_lock_bh(&ma->mca_lock);
2297 if (del_timer(&ma->mca_timer)) {
2298 atomic_dec(&ma->mca_refcnt);
2299 delay = ma->mca_timer.expires - jiffies;
2300 }
2301
2302 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2303 atomic_inc(&ma->mca_refcnt);
2304 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2305 spin_unlock_bh(&ma->mca_lock);
2306 }
2307
2308 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2309 struct inet6_dev *idev)
2310 {
2311 int err;
2312
2313 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2314 * so no other readers or writers of iml or its sflist
2315 */
2316 if (!iml->sflist) {
2317 /* any-source empty exclude case */
2318 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2319 }
2320 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2321 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2322 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2323 iml->sflist = NULL;
2324 return err;
2325 }
2326
2327 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2328 {
2329 if (mld_in_v1_mode(ma->idev)) {
2330 if (ma->mca_flags & MAF_LAST_REPORTER)
2331 igmp6_send(&ma->mca_addr, ma->idev->dev,
2332 ICMPV6_MGM_REDUCTION);
2333 } else {
2334 mld_add_delrec(ma->idev, ma);
2335 mld_ifc_event(ma->idev);
2336 }
2337 }
2338
2339 static void mld_gq_timer_expire(unsigned long data)
2340 {
2341 struct inet6_dev *idev = (struct inet6_dev *)data;
2342
2343 idev->mc_gq_running = 0;
2344 mld_send_report(idev, NULL);
2345 __in6_dev_put(idev);
2346 }
2347
2348 static void mld_ifc_timer_expire(unsigned long data)
2349 {
2350 struct inet6_dev *idev = (struct inet6_dev *)data;
2351
2352 mld_send_cr(idev);
2353 if (idev->mc_ifc_count) {
2354 idev->mc_ifc_count--;
2355 if (idev->mc_ifc_count)
2356 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2357 }
2358 __in6_dev_put(idev);
2359 }
2360
2361 static void mld_ifc_event(struct inet6_dev *idev)
2362 {
2363 if (mld_in_v1_mode(idev))
2364 return;
2365 idev->mc_ifc_count = idev->mc_qrv;
2366 mld_ifc_start_timer(idev, 1);
2367 }
2368
2369
2370 static void igmp6_timer_handler(unsigned long data)
2371 {
2372 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2373
2374 if (mld_in_v1_mode(ma->idev))
2375 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2376 else
2377 mld_send_report(ma->idev, ma);
2378
2379 spin_lock(&ma->mca_lock);
2380 ma->mca_flags |= MAF_LAST_REPORTER;
2381 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2382 spin_unlock(&ma->mca_lock);
2383 ma_put(ma);
2384 }
2385
2386 /* Device changing type */
2387
2388 void ipv6_mc_unmap(struct inet6_dev *idev)
2389 {
2390 struct ifmcaddr6 *i;
2391
2392 /* Install multicast list, except for all-nodes (already installed) */
2393
2394 read_lock_bh(&idev->lock);
2395 for (i = idev->mc_list; i; i = i->next)
2396 igmp6_group_dropped(i);
2397 read_unlock_bh(&idev->lock);
2398 }
2399
2400 void ipv6_mc_remap(struct inet6_dev *idev)
2401 {
2402 ipv6_mc_up(idev);
2403 }
2404
2405 /* Device going down */
2406
2407 void ipv6_mc_down(struct inet6_dev *idev)
2408 {
2409 struct ifmcaddr6 *i;
2410
2411 /* Withdraw multicast list */
2412
2413 read_lock_bh(&idev->lock);
2414 idev->mc_ifc_count = 0;
2415 if (del_timer(&idev->mc_ifc_timer))
2416 __in6_dev_put(idev);
2417 idev->mc_gq_running = 0;
2418 if (del_timer(&idev->mc_gq_timer))
2419 __in6_dev_put(idev);
2420 if (del_timer(&idev->mc_dad_timer))
2421 __in6_dev_put(idev);
2422
2423 for (i = idev->mc_list; i; i=i->next)
2424 igmp6_group_dropped(i);
2425 read_unlock_bh(&idev->lock);
2426
2427 mld_clear_delrec(idev);
2428 }
2429
2430
2431 /* Device going up */
2432
2433 void ipv6_mc_up(struct inet6_dev *idev)
2434 {
2435 struct ifmcaddr6 *i;
2436
2437 /* Install multicast list, except for all-nodes (already installed) */
2438
2439 read_lock_bh(&idev->lock);
2440 for (i = idev->mc_list; i; i=i->next)
2441 igmp6_group_added(i);
2442 read_unlock_bh(&idev->lock);
2443 }
2444
2445 /* IPv6 device initialization. */
2446
2447 void ipv6_mc_init_dev(struct inet6_dev *idev)
2448 {
2449 write_lock_bh(&idev->lock);
2450 spin_lock_init(&idev->mc_lock);
2451 idev->mc_gq_running = 0;
2452 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2453 (unsigned long)idev);
2454 idev->mc_tomb = NULL;
2455 idev->mc_ifc_count = 0;
2456 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2457 (unsigned long)idev);
2458 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2459 (unsigned long)idev);
2460
2461 idev->mc_qrv = MLD_QRV_DEFAULT;
2462 idev->mc_qi = MLD_QI_DEFAULT;
2463 idev->mc_qri = MLD_QRI_DEFAULT;
2464
2465 idev->mc_maxdelay = unsolicited_report_interval(idev);
2466 idev->mc_v1_seen = 0;
2467 write_unlock_bh(&idev->lock);
2468 }
2469
2470 /*
2471 * Device is about to be destroyed: clean up.
2472 */
2473
2474 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2475 {
2476 struct ifmcaddr6 *i;
2477
2478 /* Deactivate timers */
2479 ipv6_mc_down(idev);
2480
2481 /* Delete all-nodes address. */
2482 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2483 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2484 * fail.
2485 */
2486 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2487
2488 if (idev->cnf.forwarding)
2489 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2490
2491 write_lock_bh(&idev->lock);
2492 while ((i = idev->mc_list) != NULL) {
2493 idev->mc_list = i->next;
2494 write_unlock_bh(&idev->lock);
2495
2496 igmp6_group_dropped(i);
2497 ma_put(i);
2498
2499 write_lock_bh(&idev->lock);
2500 }
2501 write_unlock_bh(&idev->lock);
2502 }
2503
2504 #ifdef CONFIG_PROC_FS
2505 struct igmp6_mc_iter_state {
2506 struct seq_net_private p;
2507 struct net_device *dev;
2508 struct inet6_dev *idev;
2509 };
2510
2511 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2512
2513 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2514 {
2515 struct ifmcaddr6 *im = NULL;
2516 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2517 struct net *net = seq_file_net(seq);
2518
2519 state->idev = NULL;
2520 for_each_netdev_rcu(net, state->dev) {
2521 struct inet6_dev *idev;
2522 idev = __in6_dev_get(state->dev);
2523 if (!idev)
2524 continue;
2525 read_lock_bh(&idev->lock);
2526 im = idev->mc_list;
2527 if (im) {
2528 state->idev = idev;
2529 break;
2530 }
2531 read_unlock_bh(&idev->lock);
2532 }
2533 return im;
2534 }
2535
2536 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2537 {
2538 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2539
2540 im = im->next;
2541 while (!im) {
2542 if (likely(state->idev != NULL))
2543 read_unlock_bh(&state->idev->lock);
2544
2545 state->dev = next_net_device_rcu(state->dev);
2546 if (!state->dev) {
2547 state->idev = NULL;
2548 break;
2549 }
2550 state->idev = __in6_dev_get(state->dev);
2551 if (!state->idev)
2552 continue;
2553 read_lock_bh(&state->idev->lock);
2554 im = state->idev->mc_list;
2555 }
2556 return im;
2557 }
2558
2559 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2560 {
2561 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2562 if (im)
2563 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2564 --pos;
2565 return pos ? NULL : im;
2566 }
2567
2568 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2569 __acquires(RCU)
2570 {
2571 rcu_read_lock();
2572 return igmp6_mc_get_idx(seq, *pos);
2573 }
2574
2575 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2576 {
2577 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2578
2579 ++*pos;
2580 return im;
2581 }
2582
2583 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2584 __releases(RCU)
2585 {
2586 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2587
2588 if (likely(state->idev != NULL)) {
2589 read_unlock_bh(&state->idev->lock);
2590 state->idev = NULL;
2591 }
2592 state->dev = NULL;
2593 rcu_read_unlock();
2594 }
2595
2596 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2597 {
2598 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2599 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2600
2601 seq_printf(seq,
2602 "%-4d %-15s %pi6 %5d %08X %ld\n",
2603 state->dev->ifindex, state->dev->name,
2604 &im->mca_addr,
2605 im->mca_users, im->mca_flags,
2606 (im->mca_flags&MAF_TIMER_RUNNING) ?
2607 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2608 return 0;
2609 }
2610
2611 static const struct seq_operations igmp6_mc_seq_ops = {
2612 .start = igmp6_mc_seq_start,
2613 .next = igmp6_mc_seq_next,
2614 .stop = igmp6_mc_seq_stop,
2615 .show = igmp6_mc_seq_show,
2616 };
2617
2618 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2619 {
2620 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2621 sizeof(struct igmp6_mc_iter_state));
2622 }
2623
2624 static const struct file_operations igmp6_mc_seq_fops = {
2625 .owner = THIS_MODULE,
2626 .open = igmp6_mc_seq_open,
2627 .read = seq_read,
2628 .llseek = seq_lseek,
2629 .release = seq_release_net,
2630 };
2631
2632 struct igmp6_mcf_iter_state {
2633 struct seq_net_private p;
2634 struct net_device *dev;
2635 struct inet6_dev *idev;
2636 struct ifmcaddr6 *im;
2637 };
2638
2639 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2640
2641 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2642 {
2643 struct ip6_sf_list *psf = NULL;
2644 struct ifmcaddr6 *im = NULL;
2645 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2646 struct net *net = seq_file_net(seq);
2647
2648 state->idev = NULL;
2649 state->im = NULL;
2650 for_each_netdev_rcu(net, state->dev) {
2651 struct inet6_dev *idev;
2652 idev = __in6_dev_get(state->dev);
2653 if (unlikely(idev == NULL))
2654 continue;
2655 read_lock_bh(&idev->lock);
2656 im = idev->mc_list;
2657 if (likely(im != NULL)) {
2658 spin_lock_bh(&im->mca_lock);
2659 psf = im->mca_sources;
2660 if (likely(psf != NULL)) {
2661 state->im = im;
2662 state->idev = idev;
2663 break;
2664 }
2665 spin_unlock_bh(&im->mca_lock);
2666 }
2667 read_unlock_bh(&idev->lock);
2668 }
2669 return psf;
2670 }
2671
2672 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2673 {
2674 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2675
2676 psf = psf->sf_next;
2677 while (!psf) {
2678 spin_unlock_bh(&state->im->mca_lock);
2679 state->im = state->im->next;
2680 while (!state->im) {
2681 if (likely(state->idev != NULL))
2682 read_unlock_bh(&state->idev->lock);
2683
2684 state->dev = next_net_device_rcu(state->dev);
2685 if (!state->dev) {
2686 state->idev = NULL;
2687 goto out;
2688 }
2689 state->idev = __in6_dev_get(state->dev);
2690 if (!state->idev)
2691 continue;
2692 read_lock_bh(&state->idev->lock);
2693 state->im = state->idev->mc_list;
2694 }
2695 if (!state->im)
2696 break;
2697 spin_lock_bh(&state->im->mca_lock);
2698 psf = state->im->mca_sources;
2699 }
2700 out:
2701 return psf;
2702 }
2703
2704 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2705 {
2706 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2707 if (psf)
2708 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2709 --pos;
2710 return pos ? NULL : psf;
2711 }
2712
2713 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2714 __acquires(RCU)
2715 {
2716 rcu_read_lock();
2717 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2718 }
2719
2720 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2721 {
2722 struct ip6_sf_list *psf;
2723 if (v == SEQ_START_TOKEN)
2724 psf = igmp6_mcf_get_first(seq);
2725 else
2726 psf = igmp6_mcf_get_next(seq, v);
2727 ++*pos;
2728 return psf;
2729 }
2730
2731 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2732 __releases(RCU)
2733 {
2734 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2735 if (likely(state->im != NULL)) {
2736 spin_unlock_bh(&state->im->mca_lock);
2737 state->im = NULL;
2738 }
2739 if (likely(state->idev != NULL)) {
2740 read_unlock_bh(&state->idev->lock);
2741 state->idev = NULL;
2742 }
2743 state->dev = NULL;
2744 rcu_read_unlock();
2745 }
2746
2747 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2748 {
2749 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2750 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2751
2752 if (v == SEQ_START_TOKEN) {
2753 seq_printf(seq,
2754 "%3s %6s "
2755 "%32s %32s %6s %6s\n", "Idx",
2756 "Device", "Multicast Address",
2757 "Source Address", "INC", "EXC");
2758 } else {
2759 seq_printf(seq,
2760 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2761 state->dev->ifindex, state->dev->name,
2762 &state->im->mca_addr,
2763 &psf->sf_addr,
2764 psf->sf_count[MCAST_INCLUDE],
2765 psf->sf_count[MCAST_EXCLUDE]);
2766 }
2767 return 0;
2768 }
2769
2770 static const struct seq_operations igmp6_mcf_seq_ops = {
2771 .start = igmp6_mcf_seq_start,
2772 .next = igmp6_mcf_seq_next,
2773 .stop = igmp6_mcf_seq_stop,
2774 .show = igmp6_mcf_seq_show,
2775 };
2776
2777 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2778 {
2779 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2780 sizeof(struct igmp6_mcf_iter_state));
2781 }
2782
2783 static const struct file_operations igmp6_mcf_seq_fops = {
2784 .owner = THIS_MODULE,
2785 .open = igmp6_mcf_seq_open,
2786 .read = seq_read,
2787 .llseek = seq_lseek,
2788 .release = seq_release_net,
2789 };
2790
2791 static int __net_init igmp6_proc_init(struct net *net)
2792 {
2793 int err;
2794
2795 err = -ENOMEM;
2796 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2797 goto out;
2798 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2799 &igmp6_mcf_seq_fops))
2800 goto out_proc_net_igmp6;
2801
2802 err = 0;
2803 out:
2804 return err;
2805
2806 out_proc_net_igmp6:
2807 remove_proc_entry("igmp6", net->proc_net);
2808 goto out;
2809 }
2810
2811 static void __net_exit igmp6_proc_exit(struct net *net)
2812 {
2813 remove_proc_entry("mcfilter6", net->proc_net);
2814 remove_proc_entry("igmp6", net->proc_net);
2815 }
2816 #else
2817 static inline int igmp6_proc_init(struct net *net)
2818 {
2819 return 0;
2820 }
2821 static inline void igmp6_proc_exit(struct net *net)
2822 {
2823 }
2824 #endif
2825
2826 static int __net_init igmp6_net_init(struct net *net)
2827 {
2828 int err;
2829
2830 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2831 SOCK_RAW, IPPROTO_ICMPV6, net);
2832 if (err < 0) {
2833 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2834 err);
2835 goto out;
2836 }
2837
2838 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2839
2840 err = igmp6_proc_init(net);
2841 if (err)
2842 goto out_sock_create;
2843 out:
2844 return err;
2845
2846 out_sock_create:
2847 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2848 goto out;
2849 }
2850
2851 static void __net_exit igmp6_net_exit(struct net *net)
2852 {
2853 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2854 igmp6_proc_exit(net);
2855 }
2856
2857 static struct pernet_operations igmp6_net_ops = {
2858 .init = igmp6_net_init,
2859 .exit = igmp6_net_exit,
2860 };
2861
2862 int __init igmp6_init(void)
2863 {
2864 return register_pernet_subsys(&igmp6_net_ops);
2865 }
2866
2867 void igmp6_cleanup(void)
2868 {
2869 unregister_pernet_subsys(&igmp6_net_ops);
2870 }
Linux kernel - Deliverables
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