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Merge tag 'iommu-fixes-v3.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 /* Drop queries with not link local source */
1305 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1306 return -EINVAL;
1307
1308 idev = __in6_dev_get(skb->dev);
1309 if (idev == NULL)
1310 return 0;
1311
1312 mld = (struct mld_msg *)icmp6_hdr(skb);
1313 group = &mld->mld_mca;
1314 group_type = ipv6_addr_type(group);
1315
1316 if (group_type != IPV6_ADDR_ANY &&
1317 !(group_type&IPV6_ADDR_MULTICAST))
1318 return -EINVAL;
1319
1320 if (len == MLD_V1_QUERY_LEN) {
1321 err = mld_process_v1(idev, mld, &max_delay);
1322 if (err < 0)
1323 return err;
1324 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1325 int srcs_offset = sizeof(struct mld2_query) -
1326 sizeof(struct icmp6hdr);
1327
1328 if (!pskb_may_pull(skb, srcs_offset))
1329 return -EINVAL;
1330
1331 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1332
1333 err = mld_process_v2(idev, mlh2, &max_delay);
1334 if (err < 0)
1335 return err;
1336
1337 if (group_type == IPV6_ADDR_ANY) { /* general query */
1338 if (mlh2->mld2q_nsrcs)
1339 return -EINVAL; /* no sources allowed */
1340
1341 mld_gq_start_timer(idev);
1342 return 0;
1343 }
1344 /* mark sources to include, if group & source-specific */
1345 if (mlh2->mld2q_nsrcs != 0) {
1346 if (!pskb_may_pull(skb, srcs_offset +
1347 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1348 return -EINVAL;
1349
1350 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1351 mark = 1;
1352 }
1353 } else
1354 return -EINVAL;
1355
1356 read_lock_bh(&idev->lock);
1357 if (group_type == IPV6_ADDR_ANY) {
1358 for (ma = idev->mc_list; ma; ma=ma->next) {
1359 spin_lock_bh(&ma->mca_lock);
1360 igmp6_group_queried(ma, max_delay);
1361 spin_unlock_bh(&ma->mca_lock);
1362 }
1363 } else {
1364 for (ma = idev->mc_list; ma; ma=ma->next) {
1365 if (!ipv6_addr_equal(group, &ma->mca_addr))
1366 continue;
1367 spin_lock_bh(&ma->mca_lock);
1368 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1369 /* gsquery <- gsquery && mark */
1370 if (!mark)
1371 ma->mca_flags &= ~MAF_GSQUERY;
1372 } else {
1373 /* gsquery <- mark */
1374 if (mark)
1375 ma->mca_flags |= MAF_GSQUERY;
1376 else
1377 ma->mca_flags &= ~MAF_GSQUERY;
1378 }
1379 if (!(ma->mca_flags & MAF_GSQUERY) ||
1380 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1381 igmp6_group_queried(ma, max_delay);
1382 spin_unlock_bh(&ma->mca_lock);
1383 break;
1384 }
1385 }
1386 read_unlock_bh(&idev->lock);
1387
1388 return 0;
1389 }
1390
1391 /* called with rcu_read_lock() */
1392 int igmp6_event_report(struct sk_buff *skb)
1393 {
1394 struct ifmcaddr6 *ma;
1395 struct inet6_dev *idev;
1396 struct mld_msg *mld;
1397 int addr_type;
1398
1399 /* Our own report looped back. Ignore it. */
1400 if (skb->pkt_type == PACKET_LOOPBACK)
1401 return 0;
1402
1403 /* send our report if the MC router may not have heard this report */
1404 if (skb->pkt_type != PACKET_MULTICAST &&
1405 skb->pkt_type != PACKET_BROADCAST)
1406 return 0;
1407
1408 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1409 return -EINVAL;
1410
1411 mld = (struct mld_msg *)icmp6_hdr(skb);
1412
1413 /* Drop reports with not link local source */
1414 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1415 if (addr_type != IPV6_ADDR_ANY &&
1416 !(addr_type&IPV6_ADDR_LINKLOCAL))
1417 return -EINVAL;
1418
1419 idev = __in6_dev_get(skb->dev);
1420 if (idev == NULL)
1421 return -ENODEV;
1422
1423 /*
1424 * Cancel the timer for this group
1425 */
1426
1427 read_lock_bh(&idev->lock);
1428 for (ma = idev->mc_list; ma; ma=ma->next) {
1429 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1430 spin_lock(&ma->mca_lock);
1431 if (del_timer(&ma->mca_timer))
1432 atomic_dec(&ma->mca_refcnt);
1433 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1434 spin_unlock(&ma->mca_lock);
1435 break;
1436 }
1437 }
1438 read_unlock_bh(&idev->lock);
1439 return 0;
1440 }
1441
1442 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1443 int gdeleted, int sdeleted)
1444 {
1445 switch (type) {
1446 case MLD2_MODE_IS_INCLUDE:
1447 case MLD2_MODE_IS_EXCLUDE:
1448 if (gdeleted || sdeleted)
1449 return false;
1450 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1451 if (pmc->mca_sfmode == MCAST_INCLUDE)
1452 return true;
1453 /* don't include if this source is excluded
1454 * in all filters
1455 */
1456 if (psf->sf_count[MCAST_INCLUDE])
1457 return type == MLD2_MODE_IS_INCLUDE;
1458 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1459 psf->sf_count[MCAST_EXCLUDE];
1460 }
1461 return false;
1462 case MLD2_CHANGE_TO_INCLUDE:
1463 if (gdeleted || sdeleted)
1464 return false;
1465 return psf->sf_count[MCAST_INCLUDE] != 0;
1466 case MLD2_CHANGE_TO_EXCLUDE:
1467 if (gdeleted || sdeleted)
1468 return false;
1469 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1470 psf->sf_count[MCAST_INCLUDE])
1471 return false;
1472 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1473 psf->sf_count[MCAST_EXCLUDE];
1474 case MLD2_ALLOW_NEW_SOURCES:
1475 if (gdeleted || !psf->sf_crcount)
1476 return false;
1477 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1478 case MLD2_BLOCK_OLD_SOURCES:
1479 if (pmc->mca_sfmode == MCAST_INCLUDE)
1480 return gdeleted || (psf->sf_crcount && sdeleted);
1481 return psf->sf_crcount && !gdeleted && !sdeleted;
1482 }
1483 return false;
1484 }
1485
1486 static int
1487 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1488 {
1489 struct ip6_sf_list *psf;
1490 int scount = 0;
1491
1492 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1493 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1494 continue;
1495 scount++;
1496 }
1497 return scount;
1498 }
1499
1500 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1501 struct net_device *dev,
1502 const struct in6_addr *saddr,
1503 const struct in6_addr *daddr,
1504 int proto, int len)
1505 {
1506 struct ipv6hdr *hdr;
1507
1508 skb->protocol = htons(ETH_P_IPV6);
1509 skb->dev = dev;
1510
1511 skb_reset_network_header(skb);
1512 skb_put(skb, sizeof(struct ipv6hdr));
1513 hdr = ipv6_hdr(skb);
1514
1515 ip6_flow_hdr(hdr, 0, 0);
1516
1517 hdr->payload_len = htons(len);
1518 hdr->nexthdr = proto;
1519 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1520
1521 hdr->saddr = *saddr;
1522 hdr->daddr = *daddr;
1523 }
1524
1525 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1526 {
1527 struct net_device *dev = idev->dev;
1528 struct net *net = dev_net(dev);
1529 struct sock *sk = net->ipv6.igmp_sk;
1530 struct sk_buff *skb;
1531 struct mld2_report *pmr;
1532 struct in6_addr addr_buf;
1533 const struct in6_addr *saddr;
1534 int hlen = LL_RESERVED_SPACE(dev);
1535 int tlen = dev->needed_tailroom;
1536 int err;
1537 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1538 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1539 IPV6_TLV_PADN, 0 };
1540
1541 /* we assume size > sizeof(ra) here */
1542 size += hlen + tlen;
1543 /* limit our allocations to order-0 page */
1544 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1545 skb = sock_alloc_send_skb(sk, size, 1, &err);
1546
1547 if (!skb)
1548 return NULL;
1549
1550 skb->priority = TC_PRIO_CONTROL;
1551 skb_reserve(skb, hlen);
1552
1553 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1554 /* <draft-ietf-magma-mld-source-05.txt>:
1555 * use unspecified address as the source address
1556 * when a valid link-local address is not available.
1557 */
1558 saddr = &in6addr_any;
1559 } else
1560 saddr = &addr_buf;
1561
1562 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1563
1564 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1565
1566 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1567 skb_put(skb, sizeof(*pmr));
1568 pmr = (struct mld2_report *)skb_transport_header(skb);
1569 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1570 pmr->mld2r_resv1 = 0;
1571 pmr->mld2r_cksum = 0;
1572 pmr->mld2r_resv2 = 0;
1573 pmr->mld2r_ngrec = 0;
1574 return skb;
1575 }
1576
1577 static void mld_sendpack(struct sk_buff *skb)
1578 {
1579 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1580 struct mld2_report *pmr =
1581 (struct mld2_report *)skb_transport_header(skb);
1582 int payload_len, mldlen;
1583 struct inet6_dev *idev;
1584 struct net *net = dev_net(skb->dev);
1585 int err;
1586 struct flowi6 fl6;
1587 struct dst_entry *dst;
1588
1589 rcu_read_lock();
1590 idev = __in6_dev_get(skb->dev);
1591 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1592
1593 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1594 sizeof(*pip6);
1595 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1596 pip6->payload_len = htons(payload_len);
1597
1598 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1599 IPPROTO_ICMPV6,
1600 csum_partial(skb_transport_header(skb),
1601 mldlen, 0));
1602
1603 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1604 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1605 skb->dev->ifindex);
1606 dst = icmp6_dst_alloc(skb->dev, &fl6);
1607
1608 err = 0;
1609 if (IS_ERR(dst)) {
1610 err = PTR_ERR(dst);
1611 dst = NULL;
1612 }
1613 skb_dst_set(skb, dst);
1614 if (err)
1615 goto err_out;
1616
1617 payload_len = skb->len;
1618
1619 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1620 dst_output);
1621 out:
1622 if (!err) {
1623 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1624 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1625 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1626 } else {
1627 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1628 }
1629
1630 rcu_read_unlock();
1631 return;
1632
1633 err_out:
1634 kfree_skb(skb);
1635 goto out;
1636 }
1637
1638 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1639 {
1640 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1641 }
1642
1643 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1644 int type, struct mld2_grec **ppgr)
1645 {
1646 struct net_device *dev = pmc->idev->dev;
1647 struct mld2_report *pmr;
1648 struct mld2_grec *pgr;
1649
1650 if (!skb)
1651 skb = mld_newpack(pmc->idev, dev->mtu);
1652 if (!skb)
1653 return NULL;
1654 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1655 pgr->grec_type = type;
1656 pgr->grec_auxwords = 0;
1657 pgr->grec_nsrcs = 0;
1658 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1659 pmr = (struct mld2_report *)skb_transport_header(skb);
1660 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1661 *ppgr = pgr;
1662 return skb;
1663 }
1664
1665 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1666 skb_tailroom(skb)) : 0)
1667
1668 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1669 int type, int gdeleted, int sdeleted, int crsend)
1670 {
1671 struct inet6_dev *idev = pmc->idev;
1672 struct net_device *dev = idev->dev;
1673 struct mld2_report *pmr;
1674 struct mld2_grec *pgr = NULL;
1675 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1676 int scount, stotal, first, isquery, truncate;
1677
1678 if (pmc->mca_flags & MAF_NOREPORT)
1679 return skb;
1680
1681 isquery = type == MLD2_MODE_IS_INCLUDE ||
1682 type == MLD2_MODE_IS_EXCLUDE;
1683 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1684 type == MLD2_CHANGE_TO_EXCLUDE;
1685
1686 stotal = scount = 0;
1687
1688 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1689
1690 if (!*psf_list)
1691 goto empty_source;
1692
1693 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1694
1695 /* EX and TO_EX get a fresh packet, if needed */
1696 if (truncate) {
1697 if (pmr && pmr->mld2r_ngrec &&
1698 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1699 if (skb)
1700 mld_sendpack(skb);
1701 skb = mld_newpack(idev, dev->mtu);
1702 }
1703 }
1704 first = 1;
1705 psf_prev = NULL;
1706 for (psf=*psf_list; psf; psf=psf_next) {
1707 struct in6_addr *psrc;
1708
1709 psf_next = psf->sf_next;
1710
1711 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1712 psf_prev = psf;
1713 continue;
1714 }
1715
1716 /* clear marks on query responses */
1717 if (isquery)
1718 psf->sf_gsresp = 0;
1719
1720 if (AVAILABLE(skb) < sizeof(*psrc) +
1721 first*sizeof(struct mld2_grec)) {
1722 if (truncate && !first)
1723 break; /* truncate these */
1724 if (pgr)
1725 pgr->grec_nsrcs = htons(scount);
1726 if (skb)
1727 mld_sendpack(skb);
1728 skb = mld_newpack(idev, dev->mtu);
1729 first = 1;
1730 scount = 0;
1731 }
1732 if (first) {
1733 skb = add_grhead(skb, pmc, type, &pgr);
1734 first = 0;
1735 }
1736 if (!skb)
1737 return NULL;
1738 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1739 *psrc = psf->sf_addr;
1740 scount++; stotal++;
1741 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1742 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1743 psf->sf_crcount--;
1744 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1745 if (psf_prev)
1746 psf_prev->sf_next = psf->sf_next;
1747 else
1748 *psf_list = psf->sf_next;
1749 kfree(psf);
1750 continue;
1751 }
1752 }
1753 psf_prev = psf;
1754 }
1755
1756 empty_source:
1757 if (!stotal) {
1758 if (type == MLD2_ALLOW_NEW_SOURCES ||
1759 type == MLD2_BLOCK_OLD_SOURCES)
1760 return skb;
1761 if (pmc->mca_crcount || isquery || crsend) {
1762 /* make sure we have room for group header */
1763 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1764 mld_sendpack(skb);
1765 skb = NULL; /* add_grhead will get a new one */
1766 }
1767 skb = add_grhead(skb, pmc, type, &pgr);
1768 }
1769 }
1770 if (pgr)
1771 pgr->grec_nsrcs = htons(scount);
1772
1773 if (isquery)
1774 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1775 return skb;
1776 }
1777
1778 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1779 {
1780 struct sk_buff *skb = NULL;
1781 int type;
1782
1783 read_lock_bh(&idev->lock);
1784 if (!pmc) {
1785 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1786 if (pmc->mca_flags & MAF_NOREPORT)
1787 continue;
1788 spin_lock_bh(&pmc->mca_lock);
1789 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1790 type = MLD2_MODE_IS_EXCLUDE;
1791 else
1792 type = MLD2_MODE_IS_INCLUDE;
1793 skb = add_grec(skb, pmc, type, 0, 0, 0);
1794 spin_unlock_bh(&pmc->mca_lock);
1795 }
1796 } else {
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 read_unlock_bh(&idev->lock);
1806 if (skb)
1807 mld_sendpack(skb);
1808 }
1809
1810 /*
1811 * remove zero-count source records from a source filter list
1812 */
1813 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1814 {
1815 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1816
1817 psf_prev = NULL;
1818 for (psf=*ppsf; psf; psf = psf_next) {
1819 psf_next = psf->sf_next;
1820 if (psf->sf_crcount == 0) {
1821 if (psf_prev)
1822 psf_prev->sf_next = psf->sf_next;
1823 else
1824 *ppsf = psf->sf_next;
1825 kfree(psf);
1826 } else
1827 psf_prev = psf;
1828 }
1829 }
1830
1831 static void mld_send_cr(struct inet6_dev *idev)
1832 {
1833 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1834 struct sk_buff *skb = NULL;
1835 int type, dtype;
1836
1837 read_lock_bh(&idev->lock);
1838 spin_lock(&idev->mc_lock);
1839
1840 /* deleted MCA's */
1841 pmc_prev = NULL;
1842 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1843 pmc_next = pmc->next;
1844 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1845 type = MLD2_BLOCK_OLD_SOURCES;
1846 dtype = MLD2_BLOCK_OLD_SOURCES;
1847 skb = add_grec(skb, pmc, type, 1, 0, 0);
1848 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1849 }
1850 if (pmc->mca_crcount) {
1851 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1852 type = MLD2_CHANGE_TO_INCLUDE;
1853 skb = add_grec(skb, pmc, type, 1, 0, 0);
1854 }
1855 pmc->mca_crcount--;
1856 if (pmc->mca_crcount == 0) {
1857 mld_clear_zeros(&pmc->mca_tomb);
1858 mld_clear_zeros(&pmc->mca_sources);
1859 }
1860 }
1861 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1862 !pmc->mca_sources) {
1863 if (pmc_prev)
1864 pmc_prev->next = pmc_next;
1865 else
1866 idev->mc_tomb = pmc_next;
1867 in6_dev_put(pmc->idev);
1868 kfree(pmc);
1869 } else
1870 pmc_prev = pmc;
1871 }
1872 spin_unlock(&idev->mc_lock);
1873
1874 /* change recs */
1875 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1876 spin_lock_bh(&pmc->mca_lock);
1877 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1878 type = MLD2_BLOCK_OLD_SOURCES;
1879 dtype = MLD2_ALLOW_NEW_SOURCES;
1880 } else {
1881 type = MLD2_ALLOW_NEW_SOURCES;
1882 dtype = MLD2_BLOCK_OLD_SOURCES;
1883 }
1884 skb = add_grec(skb, pmc, type, 0, 0, 0);
1885 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1886
1887 /* filter mode changes */
1888 if (pmc->mca_crcount) {
1889 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1890 type = MLD2_CHANGE_TO_EXCLUDE;
1891 else
1892 type = MLD2_CHANGE_TO_INCLUDE;
1893 skb = add_grec(skb, pmc, type, 0, 0, 0);
1894 pmc->mca_crcount--;
1895 }
1896 spin_unlock_bh(&pmc->mca_lock);
1897 }
1898 read_unlock_bh(&idev->lock);
1899 if (!skb)
1900 return;
1901 (void) mld_sendpack(skb);
1902 }
1903
1904 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1905 {
1906 struct net *net = dev_net(dev);
1907 struct sock *sk = net->ipv6.igmp_sk;
1908 struct inet6_dev *idev;
1909 struct sk_buff *skb;
1910 struct mld_msg *hdr;
1911 const struct in6_addr *snd_addr, *saddr;
1912 struct in6_addr addr_buf;
1913 int hlen = LL_RESERVED_SPACE(dev);
1914 int tlen = dev->needed_tailroom;
1915 int err, len, payload_len, full_len;
1916 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1917 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1918 IPV6_TLV_PADN, 0 };
1919 struct flowi6 fl6;
1920 struct dst_entry *dst;
1921
1922 if (type == ICMPV6_MGM_REDUCTION)
1923 snd_addr = &in6addr_linklocal_allrouters;
1924 else
1925 snd_addr = addr;
1926
1927 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1928 payload_len = len + sizeof(ra);
1929 full_len = sizeof(struct ipv6hdr) + payload_len;
1930
1931 rcu_read_lock();
1932 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1933 IPSTATS_MIB_OUT, full_len);
1934 rcu_read_unlock();
1935
1936 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1937
1938 if (skb == NULL) {
1939 rcu_read_lock();
1940 IP6_INC_STATS(net, __in6_dev_get(dev),
1941 IPSTATS_MIB_OUTDISCARDS);
1942 rcu_read_unlock();
1943 return;
1944 }
1945 skb->priority = TC_PRIO_CONTROL;
1946 skb_reserve(skb, hlen);
1947
1948 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1949 /* <draft-ietf-magma-mld-source-05.txt>:
1950 * use unspecified address as the source address
1951 * when a valid link-local address is not available.
1952 */
1953 saddr = &in6addr_any;
1954 } else
1955 saddr = &addr_buf;
1956
1957 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1958
1959 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1960
1961 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1962 memset(hdr, 0, sizeof(struct mld_msg));
1963 hdr->mld_type = type;
1964 hdr->mld_mca = *addr;
1965
1966 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1967 IPPROTO_ICMPV6,
1968 csum_partial(hdr, len, 0));
1969
1970 rcu_read_lock();
1971 idev = __in6_dev_get(skb->dev);
1972
1973 icmpv6_flow_init(sk, &fl6, type,
1974 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1975 skb->dev->ifindex);
1976 dst = icmp6_dst_alloc(skb->dev, &fl6);
1977 if (IS_ERR(dst)) {
1978 err = PTR_ERR(dst);
1979 goto err_out;
1980 }
1981
1982 skb_dst_set(skb, dst);
1983 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1984 dst_output);
1985 out:
1986 if (!err) {
1987 ICMP6MSGOUT_INC_STATS(net, idev, type);
1988 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1989 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1990 } else
1991 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1992
1993 rcu_read_unlock();
1994 return;
1995
1996 err_out:
1997 kfree_skb(skb);
1998 goto out;
1999 }
2000
2001 static void mld_send_initial_cr(struct inet6_dev *idev)
2002 {
2003 struct sk_buff *skb;
2004 struct ifmcaddr6 *pmc;
2005 int type;
2006
2007 if (mld_in_v1_mode(idev))
2008 return;
2009
2010 skb = NULL;
2011 read_lock_bh(&idev->lock);
2012 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2013 spin_lock_bh(&pmc->mca_lock);
2014 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2015 type = MLD2_CHANGE_TO_EXCLUDE;
2016 else
2017 type = MLD2_CHANGE_TO_INCLUDE;
2018 skb = add_grec(skb, pmc, type, 0, 0, 1);
2019 spin_unlock_bh(&pmc->mca_lock);
2020 }
2021 read_unlock_bh(&idev->lock);
2022 if (skb)
2023 mld_sendpack(skb);
2024 }
2025
2026 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2027 {
2028 idev->mc_dad_count = idev->mc_qrv;
2029 if (idev->mc_dad_count) {
2030 mld_send_initial_cr(idev);
2031 idev->mc_dad_count--;
2032 if (idev->mc_dad_count)
2033 mld_dad_start_timer(idev, idev->mc_maxdelay);
2034 }
2035 }
2036
2037 static void mld_dad_timer_expire(unsigned long data)
2038 {
2039 struct inet6_dev *idev = (struct inet6_dev *)data;
2040
2041 mld_send_initial_cr(idev);
2042 if (idev->mc_dad_count) {
2043 idev->mc_dad_count--;
2044 if (idev->mc_dad_count)
2045 mld_dad_start_timer(idev, idev->mc_maxdelay);
2046 }
2047 in6_dev_put(idev);
2048 }
2049
2050 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2051 const struct in6_addr *psfsrc)
2052 {
2053 struct ip6_sf_list *psf, *psf_prev;
2054 int rv = 0;
2055
2056 psf_prev = NULL;
2057 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2058 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2059 break;
2060 psf_prev = psf;
2061 }
2062 if (!psf || psf->sf_count[sfmode] == 0) {
2063 /* source filter not found, or count wrong => bug */
2064 return -ESRCH;
2065 }
2066 psf->sf_count[sfmode]--;
2067 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2068 struct inet6_dev *idev = pmc->idev;
2069
2070 /* no more filters for this source */
2071 if (psf_prev)
2072 psf_prev->sf_next = psf->sf_next;
2073 else
2074 pmc->mca_sources = psf->sf_next;
2075 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2076 !mld_in_v1_mode(idev)) {
2077 psf->sf_crcount = idev->mc_qrv;
2078 psf->sf_next = pmc->mca_tomb;
2079 pmc->mca_tomb = psf;
2080 rv = 1;
2081 } else
2082 kfree(psf);
2083 }
2084 return rv;
2085 }
2086
2087 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2088 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2089 int delta)
2090 {
2091 struct ifmcaddr6 *pmc;
2092 int changerec = 0;
2093 int i, err;
2094
2095 if (!idev)
2096 return -ENODEV;
2097 read_lock_bh(&idev->lock);
2098 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2099 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2100 break;
2101 }
2102 if (!pmc) {
2103 /* MCA not found?? bug */
2104 read_unlock_bh(&idev->lock);
2105 return -ESRCH;
2106 }
2107 spin_lock_bh(&pmc->mca_lock);
2108 sf_markstate(pmc);
2109 if (!delta) {
2110 if (!pmc->mca_sfcount[sfmode]) {
2111 spin_unlock_bh(&pmc->mca_lock);
2112 read_unlock_bh(&idev->lock);
2113 return -EINVAL;
2114 }
2115 pmc->mca_sfcount[sfmode]--;
2116 }
2117 err = 0;
2118 for (i=0; i<sfcount; i++) {
2119 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2120
2121 changerec |= rv > 0;
2122 if (!err && rv < 0)
2123 err = rv;
2124 }
2125 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2126 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2127 pmc->mca_sfcount[MCAST_INCLUDE]) {
2128 struct ip6_sf_list *psf;
2129
2130 /* filter mode change */
2131 pmc->mca_sfmode = MCAST_INCLUDE;
2132 pmc->mca_crcount = idev->mc_qrv;
2133 idev->mc_ifc_count = pmc->mca_crcount;
2134 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2135 psf->sf_crcount = 0;
2136 mld_ifc_event(pmc->idev);
2137 } else if (sf_setstate(pmc) || changerec)
2138 mld_ifc_event(pmc->idev);
2139 spin_unlock_bh(&pmc->mca_lock);
2140 read_unlock_bh(&idev->lock);
2141 return err;
2142 }
2143
2144 /*
2145 * Add multicast single-source filter to the interface list
2146 */
2147 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2148 const struct in6_addr *psfsrc)
2149 {
2150 struct ip6_sf_list *psf, *psf_prev;
2151
2152 psf_prev = NULL;
2153 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2154 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2155 break;
2156 psf_prev = psf;
2157 }
2158 if (!psf) {
2159 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2160 if (!psf)
2161 return -ENOBUFS;
2162
2163 psf->sf_addr = *psfsrc;
2164 if (psf_prev) {
2165 psf_prev->sf_next = psf;
2166 } else
2167 pmc->mca_sources = psf;
2168 }
2169 psf->sf_count[sfmode]++;
2170 return 0;
2171 }
2172
2173 static void sf_markstate(struct ifmcaddr6 *pmc)
2174 {
2175 struct ip6_sf_list *psf;
2176 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2177
2178 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2179 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2180 psf->sf_oldin = mca_xcount ==
2181 psf->sf_count[MCAST_EXCLUDE] &&
2182 !psf->sf_count[MCAST_INCLUDE];
2183 } else
2184 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2185 }
2186
2187 static int sf_setstate(struct ifmcaddr6 *pmc)
2188 {
2189 struct ip6_sf_list *psf, *dpsf;
2190 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2191 int qrv = pmc->idev->mc_qrv;
2192 int new_in, rv;
2193
2194 rv = 0;
2195 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2196 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2197 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2198 !psf->sf_count[MCAST_INCLUDE];
2199 } else
2200 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2201 if (new_in) {
2202 if (!psf->sf_oldin) {
2203 struct ip6_sf_list *prev = NULL;
2204
2205 for (dpsf=pmc->mca_tomb; dpsf;
2206 dpsf=dpsf->sf_next) {
2207 if (ipv6_addr_equal(&dpsf->sf_addr,
2208 &psf->sf_addr))
2209 break;
2210 prev = dpsf;
2211 }
2212 if (dpsf) {
2213 if (prev)
2214 prev->sf_next = dpsf->sf_next;
2215 else
2216 pmc->mca_tomb = dpsf->sf_next;
2217 kfree(dpsf);
2218 }
2219 psf->sf_crcount = qrv;
2220 rv++;
2221 }
2222 } else if (psf->sf_oldin) {
2223 psf->sf_crcount = 0;
2224 /*
2225 * add or update "delete" records if an active filter
2226 * is now inactive
2227 */
2228 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2229 if (ipv6_addr_equal(&dpsf->sf_addr,
2230 &psf->sf_addr))
2231 break;
2232 if (!dpsf) {
2233 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2234 if (!dpsf)
2235 continue;
2236 *dpsf = *psf;
2237 /* pmc->mca_lock held by callers */
2238 dpsf->sf_next = pmc->mca_tomb;
2239 pmc->mca_tomb = dpsf;
2240 }
2241 dpsf->sf_crcount = qrv;
2242 rv++;
2243 }
2244 }
2245 return rv;
2246 }
2247
2248 /*
2249 * Add multicast source filter list to the interface list
2250 */
2251 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2252 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2253 int delta)
2254 {
2255 struct ifmcaddr6 *pmc;
2256 int isexclude;
2257 int i, err;
2258
2259 if (!idev)
2260 return -ENODEV;
2261 read_lock_bh(&idev->lock);
2262 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2263 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2264 break;
2265 }
2266 if (!pmc) {
2267 /* MCA not found?? bug */
2268 read_unlock_bh(&idev->lock);
2269 return -ESRCH;
2270 }
2271 spin_lock_bh(&pmc->mca_lock);
2272
2273 sf_markstate(pmc);
2274 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2275 if (!delta)
2276 pmc->mca_sfcount[sfmode]++;
2277 err = 0;
2278 for (i=0; i<sfcount; i++) {
2279 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2280 if (err)
2281 break;
2282 }
2283 if (err) {
2284 int j;
2285
2286 if (!delta)
2287 pmc->mca_sfcount[sfmode]--;
2288 for (j=0; j<i; j++)
2289 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2290 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2291 struct ip6_sf_list *psf;
2292
2293 /* filter mode change */
2294 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2295 pmc->mca_sfmode = MCAST_EXCLUDE;
2296 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2297 pmc->mca_sfmode = MCAST_INCLUDE;
2298 /* else no filters; keep old mode for reports */
2299
2300 pmc->mca_crcount = idev->mc_qrv;
2301 idev->mc_ifc_count = pmc->mca_crcount;
2302 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2303 psf->sf_crcount = 0;
2304 mld_ifc_event(idev);
2305 } else if (sf_setstate(pmc))
2306 mld_ifc_event(idev);
2307 spin_unlock_bh(&pmc->mca_lock);
2308 read_unlock_bh(&idev->lock);
2309 return err;
2310 }
2311
2312 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2313 {
2314 struct ip6_sf_list *psf, *nextpsf;
2315
2316 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2317 nextpsf = psf->sf_next;
2318 kfree(psf);
2319 }
2320 pmc->mca_tomb = NULL;
2321 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2322 nextpsf = psf->sf_next;
2323 kfree(psf);
2324 }
2325 pmc->mca_sources = NULL;
2326 pmc->mca_sfmode = MCAST_EXCLUDE;
2327 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2328 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2329 }
2330
2331
2332 static void igmp6_join_group(struct ifmcaddr6 *ma)
2333 {
2334 unsigned long delay;
2335
2336 if (ma->mca_flags & MAF_NOREPORT)
2337 return;
2338
2339 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2340
2341 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2342
2343 spin_lock_bh(&ma->mca_lock);
2344 if (del_timer(&ma->mca_timer)) {
2345 atomic_dec(&ma->mca_refcnt);
2346 delay = ma->mca_timer.expires - jiffies;
2347 }
2348
2349 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2350 atomic_inc(&ma->mca_refcnt);
2351 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2352 spin_unlock_bh(&ma->mca_lock);
2353 }
2354
2355 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2356 struct inet6_dev *idev)
2357 {
2358 int err;
2359
2360 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2361 * so no other readers or writers of iml or its sflist
2362 */
2363 if (!iml->sflist) {
2364 /* any-source empty exclude case */
2365 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2366 }
2367 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2368 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2369 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2370 iml->sflist = NULL;
2371 return err;
2372 }
2373
2374 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2375 {
2376 if (mld_in_v1_mode(ma->idev)) {
2377 if (ma->mca_flags & MAF_LAST_REPORTER)
2378 igmp6_send(&ma->mca_addr, ma->idev->dev,
2379 ICMPV6_MGM_REDUCTION);
2380 } else {
2381 mld_add_delrec(ma->idev, ma);
2382 mld_ifc_event(ma->idev);
2383 }
2384 }
2385
2386 static void mld_gq_timer_expire(unsigned long data)
2387 {
2388 struct inet6_dev *idev = (struct inet6_dev *)data;
2389
2390 idev->mc_gq_running = 0;
2391 mld_send_report(idev, NULL);
2392 in6_dev_put(idev);
2393 }
2394
2395 static void mld_ifc_timer_expire(unsigned long data)
2396 {
2397 struct inet6_dev *idev = (struct inet6_dev *)data;
2398
2399 mld_send_cr(idev);
2400 if (idev->mc_ifc_count) {
2401 idev->mc_ifc_count--;
2402 if (idev->mc_ifc_count)
2403 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2404 }
2405 in6_dev_put(idev);
2406 }
2407
2408 static void mld_ifc_event(struct inet6_dev *idev)
2409 {
2410 if (mld_in_v1_mode(idev))
2411 return;
2412 idev->mc_ifc_count = idev->mc_qrv;
2413 mld_ifc_start_timer(idev, 1);
2414 }
2415
2416
2417 static void igmp6_timer_handler(unsigned long data)
2418 {
2419 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2420
2421 if (mld_in_v1_mode(ma->idev))
2422 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2423 else
2424 mld_send_report(ma->idev, ma);
2425
2426 spin_lock(&ma->mca_lock);
2427 ma->mca_flags |= MAF_LAST_REPORTER;
2428 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2429 spin_unlock(&ma->mca_lock);
2430 ma_put(ma);
2431 }
2432
2433 /* Device changing type */
2434
2435 void ipv6_mc_unmap(struct inet6_dev *idev)
2436 {
2437 struct ifmcaddr6 *i;
2438
2439 /* Install multicast list, except for all-nodes (already installed) */
2440
2441 read_lock_bh(&idev->lock);
2442 for (i = idev->mc_list; i; i = i->next)
2443 igmp6_group_dropped(i);
2444 read_unlock_bh(&idev->lock);
2445 }
2446
2447 void ipv6_mc_remap(struct inet6_dev *idev)
2448 {
2449 ipv6_mc_up(idev);
2450 }
2451
2452 /* Device going down */
2453
2454 void ipv6_mc_down(struct inet6_dev *idev)
2455 {
2456 struct ifmcaddr6 *i;
2457
2458 /* Withdraw multicast list */
2459
2460 read_lock_bh(&idev->lock);
2461 mld_ifc_stop_timer(idev);
2462 mld_gq_stop_timer(idev);
2463 mld_dad_stop_timer(idev);
2464
2465 for (i = idev->mc_list; i; i=i->next)
2466 igmp6_group_dropped(i);
2467 read_unlock_bh(&idev->lock);
2468
2469 mld_clear_delrec(idev);
2470 }
2471
2472
2473 /* Device going up */
2474
2475 void ipv6_mc_up(struct inet6_dev *idev)
2476 {
2477 struct ifmcaddr6 *i;
2478
2479 /* Install multicast list, except for all-nodes (already installed) */
2480
2481 read_lock_bh(&idev->lock);
2482 for (i = idev->mc_list; i; i=i->next)
2483 igmp6_group_added(i);
2484 read_unlock_bh(&idev->lock);
2485 }
2486
2487 /* IPv6 device initialization. */
2488
2489 void ipv6_mc_init_dev(struct inet6_dev *idev)
2490 {
2491 write_lock_bh(&idev->lock);
2492 spin_lock_init(&idev->mc_lock);
2493 idev->mc_gq_running = 0;
2494 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2495 (unsigned long)idev);
2496 idev->mc_tomb = NULL;
2497 idev->mc_ifc_count = 0;
2498 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2499 (unsigned long)idev);
2500 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2501 (unsigned long)idev);
2502
2503 idev->mc_qrv = MLD_QRV_DEFAULT;
2504 idev->mc_qi = MLD_QI_DEFAULT;
2505 idev->mc_qri = MLD_QRI_DEFAULT;
2506
2507 idev->mc_maxdelay = unsolicited_report_interval(idev);
2508 idev->mc_v1_seen = 0;
2509 write_unlock_bh(&idev->lock);
2510 }
2511
2512 /*
2513 * Device is about to be destroyed: clean up.
2514 */
2515
2516 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2517 {
2518 struct ifmcaddr6 *i;
2519
2520 /* Deactivate timers */
2521 ipv6_mc_down(idev);
2522
2523 /* Delete all-nodes address. */
2524 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2525 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2526 * fail.
2527 */
2528 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2529
2530 if (idev->cnf.forwarding)
2531 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2532
2533 write_lock_bh(&idev->lock);
2534 while ((i = idev->mc_list) != NULL) {
2535 idev->mc_list = i->next;
2536 write_unlock_bh(&idev->lock);
2537
2538 igmp6_group_dropped(i);
2539 ma_put(i);
2540
2541 write_lock_bh(&idev->lock);
2542 }
2543 write_unlock_bh(&idev->lock);
2544 }
2545
2546 #ifdef CONFIG_PROC_FS
2547 struct igmp6_mc_iter_state {
2548 struct seq_net_private p;
2549 struct net_device *dev;
2550 struct inet6_dev *idev;
2551 };
2552
2553 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2554
2555 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2556 {
2557 struct ifmcaddr6 *im = NULL;
2558 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2559 struct net *net = seq_file_net(seq);
2560
2561 state->idev = NULL;
2562 for_each_netdev_rcu(net, state->dev) {
2563 struct inet6_dev *idev;
2564 idev = __in6_dev_get(state->dev);
2565 if (!idev)
2566 continue;
2567 read_lock_bh(&idev->lock);
2568 im = idev->mc_list;
2569 if (im) {
2570 state->idev = idev;
2571 break;
2572 }
2573 read_unlock_bh(&idev->lock);
2574 }
2575 return im;
2576 }
2577
2578 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2579 {
2580 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2581
2582 im = im->next;
2583 while (!im) {
2584 if (likely(state->idev != NULL))
2585 read_unlock_bh(&state->idev->lock);
2586
2587 state->dev = next_net_device_rcu(state->dev);
2588 if (!state->dev) {
2589 state->idev = NULL;
2590 break;
2591 }
2592 state->idev = __in6_dev_get(state->dev);
2593 if (!state->idev)
2594 continue;
2595 read_lock_bh(&state->idev->lock);
2596 im = state->idev->mc_list;
2597 }
2598 return im;
2599 }
2600
2601 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2602 {
2603 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2604 if (im)
2605 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2606 --pos;
2607 return pos ? NULL : im;
2608 }
2609
2610 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2611 __acquires(RCU)
2612 {
2613 rcu_read_lock();
2614 return igmp6_mc_get_idx(seq, *pos);
2615 }
2616
2617 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2618 {
2619 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2620
2621 ++*pos;
2622 return im;
2623 }
2624
2625 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2626 __releases(RCU)
2627 {
2628 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2629
2630 if (likely(state->idev != NULL)) {
2631 read_unlock_bh(&state->idev->lock);
2632 state->idev = NULL;
2633 }
2634 state->dev = NULL;
2635 rcu_read_unlock();
2636 }
2637
2638 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2639 {
2640 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2641 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2642
2643 seq_printf(seq,
2644 "%-4d %-15s %pi6 %5d %08X %ld\n",
2645 state->dev->ifindex, state->dev->name,
2646 &im->mca_addr,
2647 im->mca_users, im->mca_flags,
2648 (im->mca_flags&MAF_TIMER_RUNNING) ?
2649 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2650 return 0;
2651 }
2652
2653 static const struct seq_operations igmp6_mc_seq_ops = {
2654 .start = igmp6_mc_seq_start,
2655 .next = igmp6_mc_seq_next,
2656 .stop = igmp6_mc_seq_stop,
2657 .show = igmp6_mc_seq_show,
2658 };
2659
2660 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2661 {
2662 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2663 sizeof(struct igmp6_mc_iter_state));
2664 }
2665
2666 static const struct file_operations igmp6_mc_seq_fops = {
2667 .owner = THIS_MODULE,
2668 .open = igmp6_mc_seq_open,
2669 .read = seq_read,
2670 .llseek = seq_lseek,
2671 .release = seq_release_net,
2672 };
2673
2674 struct igmp6_mcf_iter_state {
2675 struct seq_net_private p;
2676 struct net_device *dev;
2677 struct inet6_dev *idev;
2678 struct ifmcaddr6 *im;
2679 };
2680
2681 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2682
2683 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2684 {
2685 struct ip6_sf_list *psf = NULL;
2686 struct ifmcaddr6 *im = NULL;
2687 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2688 struct net *net = seq_file_net(seq);
2689
2690 state->idev = NULL;
2691 state->im = NULL;
2692 for_each_netdev_rcu(net, state->dev) {
2693 struct inet6_dev *idev;
2694 idev = __in6_dev_get(state->dev);
2695 if (unlikely(idev == NULL))
2696 continue;
2697 read_lock_bh(&idev->lock);
2698 im = idev->mc_list;
2699 if (likely(im != NULL)) {
2700 spin_lock_bh(&im->mca_lock);
2701 psf = im->mca_sources;
2702 if (likely(psf != NULL)) {
2703 state->im = im;
2704 state->idev = idev;
2705 break;
2706 }
2707 spin_unlock_bh(&im->mca_lock);
2708 }
2709 read_unlock_bh(&idev->lock);
2710 }
2711 return psf;
2712 }
2713
2714 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2715 {
2716 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2717
2718 psf = psf->sf_next;
2719 while (!psf) {
2720 spin_unlock_bh(&state->im->mca_lock);
2721 state->im = state->im->next;
2722 while (!state->im) {
2723 if (likely(state->idev != NULL))
2724 read_unlock_bh(&state->idev->lock);
2725
2726 state->dev = next_net_device_rcu(state->dev);
2727 if (!state->dev) {
2728 state->idev = NULL;
2729 goto out;
2730 }
2731 state->idev = __in6_dev_get(state->dev);
2732 if (!state->idev)
2733 continue;
2734 read_lock_bh(&state->idev->lock);
2735 state->im = state->idev->mc_list;
2736 }
2737 if (!state->im)
2738 break;
2739 spin_lock_bh(&state->im->mca_lock);
2740 psf = state->im->mca_sources;
2741 }
2742 out:
2743 return psf;
2744 }
2745
2746 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2747 {
2748 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2749 if (psf)
2750 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2751 --pos;
2752 return pos ? NULL : psf;
2753 }
2754
2755 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2756 __acquires(RCU)
2757 {
2758 rcu_read_lock();
2759 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2760 }
2761
2762 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2763 {
2764 struct ip6_sf_list *psf;
2765 if (v == SEQ_START_TOKEN)
2766 psf = igmp6_mcf_get_first(seq);
2767 else
2768 psf = igmp6_mcf_get_next(seq, v);
2769 ++*pos;
2770 return psf;
2771 }
2772
2773 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2774 __releases(RCU)
2775 {
2776 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2777 if (likely(state->im != NULL)) {
2778 spin_unlock_bh(&state->im->mca_lock);
2779 state->im = NULL;
2780 }
2781 if (likely(state->idev != NULL)) {
2782 read_unlock_bh(&state->idev->lock);
2783 state->idev = NULL;
2784 }
2785 state->dev = NULL;
2786 rcu_read_unlock();
2787 }
2788
2789 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2790 {
2791 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2792 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2793
2794 if (v == SEQ_START_TOKEN) {
2795 seq_printf(seq,
2796 "%3s %6s "
2797 "%32s %32s %6s %6s\n", "Idx",
2798 "Device", "Multicast Address",
2799 "Source Address", "INC", "EXC");
2800 } else {
2801 seq_printf(seq,
2802 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2803 state->dev->ifindex, state->dev->name,
2804 &state->im->mca_addr,
2805 &psf->sf_addr,
2806 psf->sf_count[MCAST_INCLUDE],
2807 psf->sf_count[MCAST_EXCLUDE]);
2808 }
2809 return 0;
2810 }
2811
2812 static const struct seq_operations igmp6_mcf_seq_ops = {
2813 .start = igmp6_mcf_seq_start,
2814 .next = igmp6_mcf_seq_next,
2815 .stop = igmp6_mcf_seq_stop,
2816 .show = igmp6_mcf_seq_show,
2817 };
2818
2819 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2820 {
2821 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2822 sizeof(struct igmp6_mcf_iter_state));
2823 }
2824
2825 static const struct file_operations igmp6_mcf_seq_fops = {
2826 .owner = THIS_MODULE,
2827 .open = igmp6_mcf_seq_open,
2828 .read = seq_read,
2829 .llseek = seq_lseek,
2830 .release = seq_release_net,
2831 };
2832
2833 static int __net_init igmp6_proc_init(struct net *net)
2834 {
2835 int err;
2836
2837 err = -ENOMEM;
2838 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2839 goto out;
2840 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2841 &igmp6_mcf_seq_fops))
2842 goto out_proc_net_igmp6;
2843
2844 err = 0;
2845 out:
2846 return err;
2847
2848 out_proc_net_igmp6:
2849 remove_proc_entry("igmp6", net->proc_net);
2850 goto out;
2851 }
2852
2853 static void __net_exit igmp6_proc_exit(struct net *net)
2854 {
2855 remove_proc_entry("mcfilter6", net->proc_net);
2856 remove_proc_entry("igmp6", net->proc_net);
2857 }
2858 #else
2859 static inline int igmp6_proc_init(struct net *net)
2860 {
2861 return 0;
2862 }
2863 static inline void igmp6_proc_exit(struct net *net)
2864 {
2865 }
2866 #endif
2867
2868 static int __net_init igmp6_net_init(struct net *net)
2869 {
2870 int err;
2871
2872 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2873 SOCK_RAW, IPPROTO_ICMPV6, net);
2874 if (err < 0) {
2875 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2876 err);
2877 goto out;
2878 }
2879
2880 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2881
2882 err = igmp6_proc_init(net);
2883 if (err)
2884 goto out_sock_create;
2885 out:
2886 return err;
2887
2888 out_sock_create:
2889 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2890 goto out;
2891 }
2892
2893 static void __net_exit igmp6_net_exit(struct net *net)
2894 {
2895 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2896 igmp6_proc_exit(net);
2897 }
2898
2899 static struct pernet_operations igmp6_net_ops = {
2900 .init = igmp6_net_init,
2901 .exit = igmp6_net_exit,
2902 };
2903
2904 int __init igmp6_init(void)
2905 {
2906 return register_pernet_subsys(&igmp6_net_ops);
2907 }
2908
2909 void igmp6_cleanup(void)
2910 {
2911 unregister_pernet_subsys(&igmp6_net_ops);
2912 }
Linux kernel - Deliverables
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