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net: ipv6: mld: get rid of MLDV2_MRC and simplify calculation
[linux-2.6-block.git] / net / ipv6 / mcast.c
CommitLineData
1da177e4
LT		 1/*
2 * Multicast support for IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1ab1457c 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
1da177e4
LT		 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
1da177e4
LT		 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>
5a0e3ad6 46#include <linux/slab.h>
9d4a0314 47#include <linux/pkt_sched.h>
6e7cb837 48#include <net/mld.h>
1da177e4
LT		 49
50#include <linux/netfilter.h>
51#include <linux/netfilter_ipv6.h>
52
457c4cbc 53#include <net/net_namespace.h>
1da177e4
LT		 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>
1ed8516f 63#include <net/inet_common.h>
1da177e4
LT		 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
6e7cb837
YH		 76/* Ensure that we have struct in6_addr aligned on 32bit word. */
77static 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)
1da177e4
LT		 81};
82
83static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
84
85/* Big mc list lock for all the sockets */
456b61bc 86static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
1da177e4 87
1da177e4
LT		 88static void igmp6_join_group(struct ifmcaddr6 *ma);
89static void igmp6_leave_group(struct ifmcaddr6 *ma);
90static void igmp6_timer_handler(unsigned long data);
91
92static void mld_gq_timer_expire(unsigned long data);
93static void mld_ifc_timer_expire(unsigned long data);
94static void mld_ifc_event(struct inet6_dev *idev);
95static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
b71d1d42 96static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
1da177e4 97static void mld_clear_delrec(struct inet6_dev *idev);
6c567b78 98static bool mld_in_v1_mode(const struct inet6_dev *idev);
1da177e4
LT		 99static int sf_setstate(struct ifmcaddr6 *pmc);
100static void sf_markstate(struct ifmcaddr6 *pmc);
101static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
b71d1d42
ED		 102static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
103 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4 104 int delta);
b71d1d42
ED		 105static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
106 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 107 int delta);
108static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
109 struct inet6_dev *idev);
110
1da177e4 111#define MLD_QRV_DEFAULT 2
89225d1c
DB		 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)
1da177e4 116
9fd07841
DB		 117/* RFC3810, 8.1 Query Version Distinctions */
118#define MLD_V1_QUERY_LEN 24
119#define MLD_V2_QUERY_LEN_MIN 28
120
6f4353d8 121#define IPV6_MLD_MAX_MSF 64
1da177e4 122
ab32ea5d 123int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 124
125/*
126 * socket join on multicast group
127 */
128
456b61bc
ED		 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
fc4eba58
HFS		 134static int unsolicited_report_interval(struct inet6_dev *idev)
135{
136 int iv;
137
6c567b78 138 if (mld_in_v1_mode(idev))
fc4eba58
HFS		 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
9acd9f3a 146int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 147{
148 struct net_device *dev = NULL;
149 struct ipv6_mc_socklist *mc_lst;
150 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 151 struct net *net = sock_net(sk);
1da177e4
LT		 152 int err;
153
154 if (!ipv6_addr_is_multicast(addr))
155 return -EINVAL;
156
456b61bc
ED		 157 rcu_read_lock();
158 for_each_pmc_rcu(np, mc_lst) {
c9e3e8b6
DS		 159 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
160 ipv6_addr_equal(&mc_lst->addr, addr)) {
456b61bc 161 rcu_read_unlock();
c9e3e8b6
DS		 162 return -EADDRINUSE;
163 }
164 }
456b61bc 165 rcu_read_unlock();
c9e3e8b6 166
1da177e4
LT		 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;
4e3fd7a0 173 mc_lst->addr = *addr;
1da177e4 174
96b52e61 175 rcu_read_lock();
1da177e4
LT		 176 if (ifindex == 0) {
177 struct rt6_info *rt;
b8ad0cbc 178 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4 179 if (rt) {
d1918542 180 dev = rt->dst.dev;
94e187c0 181 ip6_rt_put(rt);
1da177e4
LT		 182 }
183 } else
96b52e61 184 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT		 185
186 if (dev == NULL) {
96b52e61 187 rcu_read_unlock();
1da177e4
LT		 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;
196433c5 194 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 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) {
96b52e61 204 rcu_read_unlock();
1da177e4 205 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
1da177e4
LT		 206 return err;
207 }
208
456b61bc 209 spin_lock(&ipv6_sk_mc_lock);
1da177e4 210 mc_lst->next = np->ipv6_mc_list;
456b61bc
ED		 211 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
212 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 213
96b52e61 214 rcu_read_unlock();
1da177e4
LT		 215
216 return 0;
217}
218
219/*
220 * socket leave on multicast group
221 */
9acd9f3a 222int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 223{
224 struct ipv6_pinfo *np = inet6_sk(sk);
456b61bc
ED		 225 struct ipv6_mc_socklist *mc_lst;
226 struct ipv6_mc_socklist __rcu **lnk;
3b1e0a65 227 struct net *net = sock_net(sk);
1da177e4 228
a858d64b
LW		 229 if (!ipv6_addr_is_multicast(addr))
230 return -EINVAL;
231
456b61bc
ED		 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) {
1da177e4
LT		 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;
456b61bc 242 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 243
96b52e61
ED		 244 rcu_read_lock();
245 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
b8ad0cbc 246 if (dev != NULL) {
96b52e61 247 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 248
acd6e00b 249 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 250 if (idev)
1da177e4 251 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 252 } else
253 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
96b52e61 254 rcu_read_unlock();
456b61bc 255 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 256 kfree_rcu(mc_lst, rcu);
1da177e4
LT		 257 return 0;
258 }
259 }
456b61bc 260 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 261
9951f036 262 return -EADDRNOTAVAIL;
1da177e4
LT		 263}
264
96b52e61
ED		 265/* called with rcu_read_lock() */
266static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
b71d1d42 267 const struct in6_addr *group,
96b52e61 268 int ifindex)
1da177e4
LT		 269{
270 struct net_device *dev = NULL;
271 struct inet6_dev *idev = NULL;
272
273 if (ifindex == 0) {
96b52e61 274 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4 275
1da177e4 276 if (rt) {
d1918542 277 dev = rt->dst.dev;
94e187c0 278 ip6_rt_put(rt);
1da177e4
LT		 279 }
280 } else
96b52e61 281 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT		 282
283 if (!dev)
96b52e61
ED		 284 return NULL;
285 idev = __in6_dev_get(dev);
448eb71f 286 if (!idev)
8a22c99a 287 return NULL;
1da177e4 288 read_lock_bh(&idev->lock);
96b52e61
ED		 289 if (idev->dead) {
290 read_unlock_bh(&idev->lock);
291 return NULL;
292 }
1da177e4
LT		 293 return idev;
294}
295
296void ipv6_sock_mc_close(struct sock *sk)
297{
298 struct ipv6_pinfo *np = inet6_sk(sk);
299 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 300 struct net *net = sock_net(sk);
1da177e4 301
0e1efe9d
ED		 302 if (!rcu_access_pointer(np->ipv6_mc_list))
303 return;
304
456b61bc
ED		 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) {
1da177e4
LT		 308 struct net_device *dev;
309
310 np->ipv6_mc_list = mc_lst->next;
456b61bc 311 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 312
96b52e61
ED		 313 rcu_read_lock();
314 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
1da177e4 315 if (dev) {
96b52e61 316 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 317
acd6e00b 318 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 319 if (idev)
1da177e4 320 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 321 } else
322 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
96b52e61 323 rcu_read_unlock();
1da177e4 324
456b61bc 325 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 326 kfree_rcu(mc_lst, rcu);
456b61bc
ED		 327
328 spin_lock(&ipv6_sk_mc_lock);
1da177e4 329 }
456b61bc 330 spin_unlock(&ipv6_sk_mc_lock);
1da177e4
LT		 331}
332
333int 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;
1da177e4
LT		 338 struct inet6_dev *idev;
339 struct ipv6_pinfo *inet6 = inet6_sk(sk);
340 struct ip6_sf_socklist *psl;
3b1e0a65 341 struct net *net = sock_net(sk);
1da177e4 342 int i, j, rv;
c9e3e8b6 343 int leavegroup = 0;
5ab4a6c8 344 int pmclocked = 0;
1da177e4
LT		 345 int err;
346
1da177e4
LT		 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
96b52e61
ED		 353 rcu_read_lock();
354 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
355 if (!idev) {
356 rcu_read_unlock();
1da177e4 357 return -ENODEV;
96b52e61 358 }
1da177e4
LT		 359
360 err = -EADDRNOTAVAIL;
361
456b61bc 362 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 363 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
364 continue;
365 if (ipv6_addr_equal(&pmc->addr, group))
366 break;
367 }
917f2f10
DS		 368 if (!pmc) { /* must have a prior join */
369 err = -EINVAL;
1da177e4 370 goto done;
917f2f10 371 }
1da177e4
LT		 372 /* if a source filter was set, must be the same mode as before */
373 if (pmc->sflist) {
917f2f10
DS		 374 if (pmc->sfmode != omode) {
375 err = -EINVAL;
1da177e4 376 goto done;
917f2f10 377 }
1da177e4
LT		 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
96b52e61 385 write_lock(&pmc->sflock);
5ab4a6c8
DS		 386 pmclocked = 1;
387
1da177e4
LT		 388 psl = pmc->sflist;
389 if (!add) {
390 if (!psl)
917f2f10 391 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 392 rv = !0;
393 for (i=0; i<psl->sl_count; i++) {
07c2fecc 394 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
1da177e4
LT		 395 if (rv == 0)
396 break;
397 }
398 if (rv) /* source not found */
917f2f10 399 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 400
c9e3e8b6
DS		 401 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
402 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
403 leavegroup = 1;
404 goto done;
405 }
406
1da177e4
LT		 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;
8b3a7005 428 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 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++) {
07c2fecc 444 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
56db1c5f
JS		 445 if (rv == 0) /* There is an error in the address. */
446 goto done;
1da177e4 447 }
1da177e4
LT		 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);
455done:
5ab4a6c8 456 if (pmclocked)
96b52e61 457 write_unlock(&pmc->sflock);
1da177e4 458 read_unlock_bh(&idev->lock);
96b52e61 459 rcu_read_unlock();
c9e3e8b6
DS		 460 if (leavegroup)
461 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 462 return err;
463}
464
465int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
466{
b71d1d42 467 const struct in6_addr *group;
1da177e4 468 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 469 struct inet6_dev *idev;
470 struct ipv6_pinfo *inet6 = inet6_sk(sk);
471 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 472 struct net *net = sock_net(sk);
9951f036 473 int leavegroup = 0;
1da177e4
LT		 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
96b52e61
ED		 484 rcu_read_lock();
485 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 486
96b52e61
ED		 487 if (!idev) {
488 rcu_read_unlock();
1da177e4 489 return -ENODEV;
96b52e61 490 }
1da177e4 491
9c05989b 492 err = 0;
5ab4a6c8 493
9951f036
DS		 494 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
495 leavegroup = 1;
496 goto done;
497 }
498
456b61bc 499 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 500 if (pmc->ifindex != gsf->gf_interface)
501 continue;
502 if (ipv6_addr_equal(&pmc->addr, group))
503 break;
504 }
917f2f10
DS		 505 if (!pmc) { /* must have a prior join */
506 err = -EINVAL;
1da177e4 507 goto done;
917f2f10 508 }
1da177e4 509 if (gsf->gf_numsrc) {
8b3a7005
KK		 510 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
511 GFP_ATOMIC);
1da177e4
LT		 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 }
8713dbf0 529 } else {
1da177e4 530 newpsl = NULL;
8713dbf0
YZ		 531 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
532 }
5ab4a6c8 533
96b52e61 534 write_lock(&pmc->sflock);
1da177e4
LT		 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;
96b52e61 544 write_unlock(&pmc->sflock);
917f2f10 545 err = 0;
1da177e4
LT		 546done:
547 read_unlock_bh(&idev->lock);
96b52e61 548 rcu_read_unlock();
9951f036
DS		 549 if (leavegroup)
550 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 551 return err;
552}
553
554int 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;
b71d1d42 558 const struct in6_addr *group;
1da177e4
LT		 559 struct ipv6_mc_socklist *pmc;
560 struct inet6_dev *idev;
1da177e4
LT		 561 struct ipv6_pinfo *inet6 = inet6_sk(sk);
562 struct ip6_sf_socklist *psl;
3b1e0a65 563 struct net *net = sock_net(sk);
1da177e4
LT		 564
565 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
566
567 if (!ipv6_addr_is_multicast(group))
568 return -EINVAL;
569
96b52e61
ED		 570 rcu_read_lock();
571 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 572
96b52e61
ED		 573 if (!idev) {
574 rcu_read_unlock();
1da177e4 575 return -ENODEV;
96b52e61 576 }
1da177e4
LT		 577
578 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 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 */
1da177e4 584
456b61bc 585 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 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);
96b52e61 597 rcu_read_unlock();
1da177e4
LT		 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 }
5ab4a6c8
DS		 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 */
1da177e4
LT		 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];
1ab1457c 617 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 618 return -EFAULT;
619 }
620 return 0;
621done:
622 read_unlock_bh(&idev->lock);
96b52e61 623 rcu_read_unlock();
1da177e4
LT		 624 return err;
625}
626
a50feda5
ED		 627bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
628 const struct in6_addr *src_addr)
1da177e4
LT		 629{
630 struct ipv6_pinfo *np = inet6_sk(sk);
631 struct ipv6_mc_socklist *mc;
632 struct ip6_sf_socklist *psl;
a50feda5 633 bool rv = true;
1da177e4 634
456b61bc
ED		 635 rcu_read_lock();
636 for_each_pmc_rcu(np, mc) {
1da177e4
LT		 637 if (ipv6_addr_equal(&mc->addr, mc_addr))
638 break;
639 }
640 if (!mc) {
456b61bc 641 rcu_read_unlock();
a50feda5 642 return true;
1da177e4 643 }
5ab4a6c8 644 read_lock(&mc->sflock);
1da177e4
LT		 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)
a50feda5 656 rv = false;
1da177e4 657 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
a50feda5 658 rv = false;
1da177e4 659 }
5ab4a6c8 660 read_unlock(&mc->sflock);
456b61bc 661 rcu_read_unlock();
1da177e4
LT		 662
663 return rv;
664}
665
666static 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
674static void igmp6_group_added(struct ifmcaddr6 *mc)
675{
676 struct net_device *dev = mc->idev->dev;
677 char buf[MAX_ADDR_LEN];
678
ec16ef22
YH		 679 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
680 IPV6_ADDR_SCOPE_LINKLOCAL)
681 return;
682
1da177e4
LT		 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)
22bedad3 687 dev_mc_add(dev, buf);
1da177e4
LT		 688 }
689 spin_unlock_bh(&mc->mca_lock);
690
691 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
692 return;
693
6c567b78 694 if (mld_in_v1_mode(mc->idev)) {
1da177e4
LT		 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
704static void igmp6_group_dropped(struct ifmcaddr6 *mc)
705{
706 struct net_device *dev = mc->idev->dev;
707 char buf[MAX_ADDR_LEN];
708
ec16ef22
YH		 709 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
710 IPV6_ADDR_SCOPE_LINKLOCAL)
711 return;
712
1da177e4
LT		 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)
22bedad3 717 dev_mc_del(dev, buf);
1da177e4
LT		 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);
730done:
731 ip6_mc_clear_src(mc);
732 spin_unlock_bh(&mc->mca_lock);
733}
734
735/*
736 * deleted ifmcaddr6 manipulation
737 */
738static 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 */
0c600eda 748 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 749 if (!pmc)
750 return;
0c600eda 751
1da177e4
LT		 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
6457d26b 770 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 771 pmc->next = idev->mc_tomb;
772 idev->mc_tomb = pmc;
6457d26b 773 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 774}
775
b71d1d42 776static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
1da177e4
LT		 777{
778 struct ifmcaddr6 *pmc, *pmc_prev;
779 struct ip6_sf_list *psf, *psf_next;
780
6457d26b 781 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 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 }
6457d26b
SH		 794 spin_unlock_bh(&idev->mc_lock);
795
1da177e4
LT		 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
806static void mld_clear_delrec(struct inet6_dev *idev)
807{
808 struct ifmcaddr6 *pmc, *nextpmc;
809
6457d26b 810 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 811 pmc = idev->mc_tomb;
812 idev->mc_tomb = NULL;
6457d26b 813 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 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 */
9acd9f3a 843int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 844{
845 struct ifmcaddr6 *mc;
846 struct inet6_dev *idev;
847
96b52e61 848 /* we need to take a reference on idev */
1da177e4
LT		 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
0c600eda 876 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 877
878 if (mc == NULL) {
879 write_unlock_bh(&idev->lock);
880 in6_dev_put(idev);
881 return -ENOMEM;
882 }
883
b24b8a24 884 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4 885
4e3fd7a0 886 mc->mca_addr = *addr;
96b52e61 887 mc->idev = idev; /* (reference taken) */
1da177e4
LT		 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 */
9acd9f3a 915int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 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
9acd9f3a 940int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4 941{
96b52e61 942 struct inet6_dev *idev;
1da177e4
LT		 943 int err;
944
96b52e61 945 rcu_read_lock();
1da177e4 946
96b52e61
ED		 947 idev = __in6_dev_get(dev);
948 if (!idev)
949 err = -ENODEV;
950 else
951 err = __ipv6_dev_mc_dec(idev, addr);
1da177e4 952
96b52e61 953 rcu_read_unlock();
1da177e4
LT		 954 return err;
955}
956
1da177e4
LT		 957/*
958 * check if the interface/address pair is valid
959 */
a50feda5
ED		 960bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
961 const struct in6_addr *src_addr)
1da177e4
LT		 962{
963 struct inet6_dev *idev;
964 struct ifmcaddr6 *mc;
a50feda5 965 bool rv = false;
1da177e4 966
96b52e61
ED		 967 rcu_read_lock();
968 idev = __in6_dev_get(dev);
1da177e4
LT		 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
a50feda5 992 rv = true; /* don't filter unspecified source */
1da177e4
LT		 993 }
994 read_unlock_bh(&idev->lock);
1da177e4 995 }
96b52e61 996 rcu_read_unlock();
1da177e4
LT		 997 return rv;
998}
999
1000static void mld_gq_start_timer(struct inet6_dev *idev)
1001{
c2cef4e8 1002 unsigned long tv = net_random() % idev->mc_maxdelay;
1da177e4
LT		 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
c2cef4e8 1009static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1da177e4 1010{
c2cef4e8 1011 unsigned long tv = net_random() % delay;
1da177e4
LT		 1012
1013 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1014 in6_dev_hold(idev);
1015}
1016
c2cef4e8 1017static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
b173ee48 1018{
c2cef4e8 1019 unsigned long tv = net_random() % delay;
b173ee48
HFS		 1020
1021 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1022 in6_dev_hold(idev);
1023}
1024
1da177e4
LT		 1025/*
1026 * IGMP handling (alias multicast ICMPv6 messages)
1027 */
1028
1029static 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
5ab4a6c8 1055/* mark EXCLUDE-mode sources */
a50feda5
ED		 1056static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1057 const struct in6_addr *srcs)
1da177e4
LT		 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;
5ab4a6c8
DS		 1066 for (i=0; i<nsrcs; i++) {
1067 /* skip inactive filters */
e05c4ad3 1068 if (psf->sf_count[MCAST_INCLUDE] ||
5ab4a6c8
DS		 1069 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1070 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 1071 break;
5ab4a6c8
DS		 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 */
a50feda5
ED		 1080 return false;
1081 return true;
5ab4a6c8
DS		 1082}
1083
a50feda5
ED		 1084static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1085 const struct in6_addr *srcs)
5ab4a6c8
DS		 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++) {
1da177e4
LT		 1100 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1101 psf->sf_gsresp = 1;
1102 scount++;
1103 break;
1104 }
5ab4a6c8
DS		 1105 }
1106 }
1107 if (!scount) {
1108 pmc->mca_flags &= ~MAF_GSQUERY;
a50feda5 1109 return false;
1da177e4 1110 }
5ab4a6c8 1111 pmc->mca_flags |= MAF_GSQUERY;
a50feda5 1112 return true;
1da177e4
LT		 1113}
1114
6c567b78
DB		 1115static bool mld_in_v1_mode(const struct inet6_dev *idev)
1116{
1117 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version == 1)
1118 return true;
1119 if (idev->cnf.force_mld_version == 1)
1120 return true;
1121 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1122 return true;
1123
1124 return false;
1125}
1126
89225d1c
DB		 1127static void mld_set_v1_mode(struct inet6_dev *idev)
1128{
1129 /* RFC3810, relevant sections:
1130 * - 9.1. Robustness Variable
1131 * - 9.2. Query Interval
1132 * - 9.3. Query Response Interval
1133 * - 9.12. Older Version Querier Present Timeout
1134 */
1135 unsigned long switchback;
1136
1137 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1138
1139 idev->mc_v1_seen = jiffies + switchback;
1140}
1141
1142static void mld_update_qrv(struct inet6_dev *idev,
1143 const struct mld2_query *mlh2)
1144{
1145 /* RFC3810, relevant sections:
1146 * - 5.1.8. QRV (Querier's Robustness Variable)
1147 * - 9.1. Robustness Variable
1148 */
1149
1150 /* The value of the Robustness Variable MUST NOT be zero,
1151 * and SHOULD NOT be one. Catch this here if we ever run
1152 * into such a case in future.
1153 */
1154 WARN_ON(idev->mc_qrv == 0);
1155
1156 if (mlh2->mld2q_qrv > 0)
1157 idev->mc_qrv = mlh2->mld2q_qrv;
1158
1159 if (unlikely(idev->mc_qrv < 2)) {
1160 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1161 idev->mc_qrv, MLD_QRV_DEFAULT);
1162 idev->mc_qrv = MLD_QRV_DEFAULT;
1163 }
1164}
1165
1166static void mld_update_qi(struct inet6_dev *idev,
1167 const struct mld2_query *mlh2)
1168{
1169 /* RFC3810, relevant sections:
1170 * - 5.1.9. QQIC (Querier's Query Interval Code)
1171 * - 9.2. Query Interval
1172 * - 9.12. Older Version Querier Present Timeout
1173 * (the [Query Interval] in the last Query received)
1174 */
1175 unsigned long mc_qqi;
1176
1177 if (mlh2->mld2q_qqic < 128) {
1178 mc_qqi = mlh2->mld2q_qqic;
1179 } else {
1180 unsigned long mc_man, mc_exp;
1181
1182 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1183 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1184
1185 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1186 }
1187
1188 idev->mc_qi = mc_qqi * HZ;
1189}
1190
1191static void mld_update_qri(struct inet6_dev *idev,
1192 const struct mld2_query *mlh2)
1193{
1194 /* RFC3810, relevant sections:
1195 * - 5.1.3. Maximum Response Code
1196 * - 9.3. Query Response Interval
1197 */
e3f5b170 1198 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
89225d1c
DB		 1199}
1200
96b52e61 1201/* called with rcu_read_lock() */
1da177e4
LT		 1202int igmp6_event_query(struct sk_buff *skb)
1203{
97300b5f 1204 struct mld2_query *mlh2 = NULL;
1da177e4 1205 struct ifmcaddr6 *ma;
b71d1d42 1206 const struct in6_addr *group;
1da177e4
LT		 1207 unsigned long max_delay;
1208 struct inet6_dev *idev;
6e7cb837 1209 struct mld_msg *mld;
1da177e4
LT		 1210 int group_type;
1211 int mark = 0;
1212 int len;
1213
1214 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1215 return -EINVAL;
1216
1217 /* compute payload length excluding extension headers */
0660e03f 1218 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1219 len -= skb_network_header_len(skb);
1da177e4
LT		 1220
1221 /* Drop queries with not link local source */
0660e03f 1222 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1223 return -EINVAL;
1224
96b52e61 1225 idev = __in6_dev_get(skb->dev);
1da177e4
LT		 1226
1227 if (idev == NULL)
1228 return 0;
1229
6e7cb837
YH		 1230 mld = (struct mld_msg *)icmp6_hdr(skb);
1231 group = &mld->mld_mca;
1da177e4
LT		 1232 group_type = ipv6_addr_type(group);
1233
1234 if (group_type != IPV6_ADDR_ANY &&
96b52e61 1235 !(group_type&IPV6_ADDR_MULTICAST))
1da177e4 1236 return -EINVAL;
1da177e4 1237
9fd07841 1238 if (len == MLD_V1_QUERY_LEN) {
1da177e4 1239 /* MLDv1 router present */
84698963 1240 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
89225d1c
DB		 1241
1242 mld_set_v1_mode(idev);
1243
1244 /* cancel MLDv2 report timer */
1245 idev->mc_gq_running = 0;
1246 if (del_timer(&idev->mc_gq_timer))
1247 __in6_dev_put(idev);
1da177e4
LT		 1248
1249 /* cancel the interface change timer */
1250 idev->mc_ifc_count = 0;
1251 if (del_timer(&idev->mc_ifc_timer))
1252 __in6_dev_put(idev);
1253 /* clear deleted report items */
1254 mld_clear_delrec(idev);
9fd07841 1255 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1ab1457c 1256 int srcs_offset = sizeof(struct mld2_query) -
97300b5f 1257 sizeof(struct icmp6hdr);
89225d1c
DB		 1258
1259 /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
6c567b78 1260 if (mld_in_v1_mode(idev))
89225d1c 1261 return 0;
96b52e61 1262 if (!pskb_may_pull(skb, srcs_offset))
97300b5f 1263 return -EINVAL;
96b52e61 1264
9c70220b 1265 mlh2 = (struct mld2_query *)skb_transport_header(skb);
84698963 1266
e3f5b170 1267 max_delay = max(msecs_to_jiffies(mldv2_mrc(mlh2)), 1UL);
1da177e4 1268 idev->mc_maxdelay = max_delay;
84698963 1269
89225d1c
DB		 1270 mld_update_qrv(idev, mlh2);
1271 mld_update_qi(idev, mlh2);
1272 mld_update_qri(idev, mlh2);
1273
1da177e4 1274 if (group_type == IPV6_ADDR_ANY) { /* general query */
96b52e61 1275 if (mlh2->mld2q_nsrcs)
1da177e4 1276 return -EINVAL; /* no sources allowed */
96b52e61 1277
1da177e4 1278 mld_gq_start_timer(idev);
1da177e4
LT		 1279 return 0;
1280 }
1281 /* mark sources to include, if group & source-specific */
6e7cb837 1282 if (mlh2->mld2q_nsrcs != 0) {
1ab1457c 1283 if (!pskb_may_pull(skb, srcs_offset +
96b52e61 1284 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
97300b5f 1285 return -EINVAL;
96b52e61 1286
9c70220b 1287 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1288 mark = 1;
1289 }
96b52e61 1290 } else
1da177e4 1291 return -EINVAL;
1da177e4
LT		 1292
1293 read_lock_bh(&idev->lock);
1294 if (group_type == IPV6_ADDR_ANY) {
1295 for (ma = idev->mc_list; ma; ma=ma->next) {
1296 spin_lock_bh(&ma->mca_lock);
1297 igmp6_group_queried(ma, max_delay);
1298 spin_unlock_bh(&ma->mca_lock);
1299 }
1300 } else {
1301 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1302 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1303 continue;
1304 spin_lock_bh(&ma->mca_lock);
1305 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1306 /* gsquery <- gsquery && mark */
1307 if (!mark)
1308 ma->mca_flags &= ~MAF_GSQUERY;
1309 } else {
1310 /* gsquery <- mark */
1311 if (mark)
1312 ma->mca_flags |= MAF_GSQUERY;
1313 else
1314 ma->mca_flags &= ~MAF_GSQUERY;
1315 }
5ab4a6c8 1316 if (!(ma->mca_flags & MAF_GSQUERY) ||
6e7cb837 1317 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
5ab4a6c8 1318 igmp6_group_queried(ma, max_delay);
1da177e4 1319 spin_unlock_bh(&ma->mca_lock);
7add2a43 1320 break;
1da177e4
LT		 1321 }
1322 }
1323 read_unlock_bh(&idev->lock);
1da177e4
LT		 1324
1325 return 0;
1326}
1327
96b52e61 1328/* called with rcu_read_lock() */
1da177e4
LT		 1329int igmp6_event_report(struct sk_buff *skb)
1330{
1331 struct ifmcaddr6 *ma;
1da177e4 1332 struct inet6_dev *idev;
6e7cb837 1333 struct mld_msg *mld;
1da177e4
LT		 1334 int addr_type;
1335
1336 /* Our own report looped back. Ignore it. */
1337 if (skb->pkt_type == PACKET_LOOPBACK)
1338 return 0;
1339
24c69275
DS		 1340 /* send our report if the MC router may not have heard this report */
1341 if (skb->pkt_type != PACKET_MULTICAST &&
1342 skb->pkt_type != PACKET_BROADCAST)
1343 return 0;
1344
6e7cb837 1345 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1da177e4
LT		 1346 return -EINVAL;
1347
6e7cb837 1348 mld = (struct mld_msg *)icmp6_hdr(skb);
1da177e4
LT		 1349
1350 /* Drop reports with not link local source */
0660e03f 1351 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1352 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1353 !(addr_type&IPV6_ADDR_LINKLOCAL))
1354 return -EINVAL;
1355
96b52e61 1356 idev = __in6_dev_get(skb->dev);
1da177e4
LT		 1357 if (idev == NULL)
1358 return -ENODEV;
1359
1360 /*
1361 * Cancel the timer for this group
1362 */
1363
1364 read_lock_bh(&idev->lock);
1365 for (ma = idev->mc_list; ma; ma=ma->next) {
6e7cb837 1366 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1da177e4
LT		 1367 spin_lock(&ma->mca_lock);
1368 if (del_timer(&ma->mca_timer))
1369 atomic_dec(&ma->mca_refcnt);
1370 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1371 spin_unlock(&ma->mca_lock);
1372 break;
1373 }
1374 }
1375 read_unlock_bh(&idev->lock);
1da177e4
LT		 1376 return 0;
1377}
1378
a50feda5
ED		 1379static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1380 int gdeleted, int sdeleted)
1da177e4
LT		 1381{
1382 switch (type) {
1383 case MLD2_MODE_IS_INCLUDE:
1384 case MLD2_MODE_IS_EXCLUDE:
1385 if (gdeleted || sdeleted)
a50feda5 1386 return false;
5ab4a6c8
DS		 1387 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1388 if (pmc->mca_sfmode == MCAST_INCLUDE)
a50feda5 1389 return true;
5ab4a6c8
DS		 1390 /* don't include if this source is excluded
1391 * in all filters
1392 */
1393 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1394 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1395 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1396 psf->sf_count[MCAST_EXCLUDE];
1397 }
a50feda5 1398 return false;
1da177e4
LT		 1399 case MLD2_CHANGE_TO_INCLUDE:
1400 if (gdeleted || sdeleted)
a50feda5 1401 return false;
1da177e4
LT		 1402 return psf->sf_count[MCAST_INCLUDE] != 0;
1403 case MLD2_CHANGE_TO_EXCLUDE:
1404 if (gdeleted || sdeleted)
a50feda5 1405 return false;
1da177e4
LT		 1406 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1407 psf->sf_count[MCAST_INCLUDE])
a50feda5 1408 return false;
1da177e4
LT		 1409 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1410 psf->sf_count[MCAST_EXCLUDE];
1411 case MLD2_ALLOW_NEW_SOURCES:
1412 if (gdeleted || !psf->sf_crcount)
a50feda5 1413 return false;
1da177e4
LT		 1414 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1415 case MLD2_BLOCK_OLD_SOURCES:
1416 if (pmc->mca_sfmode == MCAST_INCLUDE)
1417 return gdeleted || (psf->sf_crcount && sdeleted);
1418 return psf->sf_crcount && !gdeleted && !sdeleted;
1419 }
a50feda5 1420 return false;
1da177e4
LT		 1421}
1422
1423static int
1424mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1425{
1426 struct ip6_sf_list *psf;
1427 int scount = 0;
1428
1429 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1430 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1431 continue;
1432 scount++;
1433 }
1434 return scount;
1435}
1436
2576f17d
YH		 1437static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1438 struct net_device *dev,
1439 const struct in6_addr *saddr,
1440 const struct in6_addr *daddr,
1441 int proto, int len)
1442{
1443 struct ipv6hdr *hdr;
1444
1445 skb->protocol = htons(ETH_P_IPV6);
1446 skb->dev = dev;
1447
1448 skb_reset_network_header(skb);
1449 skb_put(skb, sizeof(struct ipv6hdr));
1450 hdr = ipv6_hdr(skb);
1451
1452 ip6_flow_hdr(hdr, 0, 0);
1453
1454 hdr->payload_len = htons(len);
1455 hdr->nexthdr = proto;
1456 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1457
1458 hdr->saddr = *saddr;
1459 hdr->daddr = *daddr;
1460}
1461
8965779d 1462static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1da177e4 1463{
8965779d 1464 struct net_device *dev = idev->dev;
c346dca1 1465 struct net *net = dev_net(dev);
b8ad0cbc 1466 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1467 struct sk_buff *skb;
1468 struct mld2_report *pmr;
1469 struct in6_addr addr_buf;
d7aabf22 1470 const struct in6_addr *saddr;
a7ae1992
HX		 1471 int hlen = LL_RESERVED_SPACE(dev);
1472 int tlen = dev->needed_tailroom;
1da177e4
LT		 1473 int err;
1474 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1475 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1476 IPV6_TLV_PADN, 0 };
1477
1478 /* we assume size > sizeof(ra) here */
a7ae1992 1479 size += hlen + tlen;
72e09ad1
ED		 1480 /* limit our allocations to order-0 page */
1481 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1482 skb = sock_alloc_send_skb(sk, size, 1, &err);
1da177e4 1483
cfcabdcc 1484 if (!skb)
1da177e4
LT		 1485 return NULL;
1486
9d4a0314 1487 skb->priority = TC_PRIO_CONTROL;
a7ae1992 1488 skb_reserve(skb, hlen);
1da177e4 1489
8965779d 1490 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1491 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1492 * use unspecified address as the source address
1da177e4
LT		 1493 * when a valid link-local address is not available.
1494 */
d7aabf22
YH		 1495 saddr = &in6addr_any;
1496 } else
1497 saddr = &addr_buf;
1da177e4 1498
2576f17d 1499 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4
LT		 1500
1501 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1502
27a884dc 1503 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1504 skb_put(skb, sizeof(*pmr));
1505 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837
YH		 1506 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1507 pmr->mld2r_resv1 = 0;
1508 pmr->mld2r_cksum = 0;
1509 pmr->mld2r_resv2 = 0;
1510 pmr->mld2r_ngrec = 0;
1da177e4
LT		 1511 return skb;
1512}
1513
1514static void mld_sendpack(struct sk_buff *skb)
1515{
0660e03f 1516 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1517 struct mld2_report *pmr =
1518 (struct mld2_report *)skb_transport_header(skb);
1da177e4 1519 int payload_len, mldlen;
96b52e61 1520 struct inet6_dev *idev;
c346dca1 1521 struct net *net = dev_net(skb->dev);
1da177e4 1522 int err;
4c9483b2 1523 struct flowi6 fl6;
adf30907 1524 struct dst_entry *dst;
1da177e4 1525
96b52e61
ED		 1526 rcu_read_lock();
1527 idev = __in6_dev_get(skb->dev);
edf391ff
NH		 1528 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1529
29a3cad5
SH		 1530 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1531 sizeof(*pip6);
1532 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1da177e4
LT		 1533 pip6->payload_len = htons(payload_len);
1534
6e7cb837
YH		 1535 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1536 IPPROTO_ICMPV6,
1537 csum_partial(skb_transport_header(skb),
1538 mldlen, 0));
41927178 1539
4c9483b2 1540 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
41927178
YH		 1541 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1542 skb->dev->ifindex);
12fd84f4 1543 dst = icmp6_dst_alloc(skb->dev, &fl6);
41927178 1544
452edd59
DM		 1545 err = 0;
1546 if (IS_ERR(dst)) {
1547 err = PTR_ERR(dst);
1548 dst = NULL;
1549 }
adf30907 1550 skb_dst_set(skb, dst);
41927178
YH		 1551 if (err)
1552 goto err_out;
1553
edf391ff
NH		 1554 payload_len = skb->len;
1555
b2e0b385 1556 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1557 dst_output);
1558out:
1da177e4 1559 if (!err) {
5a57d4c7 1560 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
e41b5368 1561 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1562 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1da177e4 1563 } else
483a47d2 1564 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 1565
96b52e61 1566 rcu_read_unlock();
41927178
YH		 1567 return;
1568
1569err_out:
1570 kfree_skb(skb);
1571 goto out;
1da177e4
LT		 1572}
1573
1574static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1575{
fab10fe3 1576 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1577}
1578
1579static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1580 int type, struct mld2_grec **ppgr)
1581{
1582 struct net_device *dev = pmc->idev->dev;
1583 struct mld2_report *pmr;
1584 struct mld2_grec *pgr;
1585
1586 if (!skb)
8965779d 1587 skb = mld_newpack(pmc->idev, dev->mtu);
1da177e4
LT		 1588 if (!skb)
1589 return NULL;
1590 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1591 pgr->grec_type = type;
1592 pgr->grec_auxwords = 0;
1593 pgr->grec_nsrcs = 0;
1594 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1595 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837 1596 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1da177e4
LT		 1597 *ppgr = pgr;
1598 return skb;
1599}
1600
1601#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1602 skb_tailroom(skb)) : 0)
1603
1604static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1605 int type, int gdeleted, int sdeleted)
1606{
8965779d
AW		 1607 struct inet6_dev *idev = pmc->idev;
1608 struct net_device *dev = idev->dev;
1da177e4
LT		 1609 struct mld2_report *pmr;
1610 struct mld2_grec *pgr = NULL;
1611 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1612 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1613
1614 if (pmc->mca_flags & MAF_NOREPORT)
1615 return skb;
1616
1617 isquery = type == MLD2_MODE_IS_INCLUDE ||
1618 type == MLD2_MODE_IS_EXCLUDE;
1619 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1620 type == MLD2_CHANGE_TO_EXCLUDE;
1621
5ab4a6c8
DS		 1622 stotal = scount = 0;
1623
1da177e4
LT		 1624 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1625
5ab4a6c8
DS		 1626 if (!*psf_list)
1627 goto empty_source;
1628
9c70220b 1629 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1630
1631 /* EX and TO_EX get a fresh packet, if needed */
1632 if (truncate) {
6e7cb837 1633 if (pmr && pmr->mld2r_ngrec &&
1da177e4
LT		 1634 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1635 if (skb)
1636 mld_sendpack(skb);
8965779d 1637 skb = mld_newpack(idev, dev->mtu);
1da177e4
LT		 1638 }
1639 }
1640 first = 1;
1da177e4
LT		 1641 psf_prev = NULL;
1642 for (psf=*psf_list; psf; psf=psf_next) {
1643 struct in6_addr *psrc;
1644
1645 psf_next = psf->sf_next;
1646
1647 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1648 psf_prev = psf;
1649 continue;
1650 }
1651
1652 /* clear marks on query responses */
1653 if (isquery)
1654 psf->sf_gsresp = 0;
1655
1656 if (AVAILABLE(skb) < sizeof(*psrc) +
1657 first*sizeof(struct mld2_grec)) {
1658 if (truncate && !first)
1659 break; /* truncate these */
1660 if (pgr)
1661 pgr->grec_nsrcs = htons(scount);
1662 if (skb)
1663 mld_sendpack(skb);
8965779d 1664 skb = mld_newpack(idev, dev->mtu);
1da177e4
LT		 1665 first = 1;
1666 scount = 0;
1667 }
1668 if (first) {
1669 skb = add_grhead(skb, pmc, type, &pgr);
1670 first = 0;
1671 }
cc63f70b
AD		 1672 if (!skb)
1673 return NULL;
1da177e4
LT		 1674 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1675 *psrc = psf->sf_addr;
5ab4a6c8 1676 scount++; stotal++;
1da177e4
LT		 1677 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1678 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1679 psf->sf_crcount--;
1680 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1681 if (psf_prev)
1682 psf_prev->sf_next = psf->sf_next;
1683 else
1684 *psf_list = psf->sf_next;
1685 kfree(psf);
1686 continue;
1687 }
1688 }
1689 psf_prev = psf;
1690 }
5ab4a6c8
DS		 1691
1692empty_source:
1693 if (!stotal) {
1694 if (type == MLD2_ALLOW_NEW_SOURCES ||
1695 type == MLD2_BLOCK_OLD_SOURCES)
1696 return skb;
1697 if (pmc->mca_crcount || isquery) {
1698 /* make sure we have room for group header */
1699 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1700 mld_sendpack(skb);
1701 skb = NULL; /* add_grhead will get a new one */
1702 }
1703 skb = add_grhead(skb, pmc, type, &pgr);
1704 }
1705 }
1da177e4
LT		 1706 if (pgr)
1707 pgr->grec_nsrcs = htons(scount);
1708
1709 if (isquery)
1710 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1711 return skb;
1712}
1713
1714static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1715{
1716 struct sk_buff *skb = NULL;
1717 int type;
1718
8965779d 1719 read_lock_bh(&idev->lock);
1da177e4 1720 if (!pmc) {
1da177e4
LT		 1721 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1722 if (pmc->mca_flags & MAF_NOREPORT)
1723 continue;
1724 spin_lock_bh(&pmc->mca_lock);
1725 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1726 type = MLD2_MODE_IS_EXCLUDE;
1727 else
1728 type = MLD2_MODE_IS_INCLUDE;
1729 skb = add_grec(skb, pmc, type, 0, 0);
1730 spin_unlock_bh(&pmc->mca_lock);
1731 }
1da177e4
LT		 1732 } else {
1733 spin_lock_bh(&pmc->mca_lock);
1734 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1735 type = MLD2_MODE_IS_EXCLUDE;
1736 else
1737 type = MLD2_MODE_IS_INCLUDE;
1738 skb = add_grec(skb, pmc, type, 0, 0);
1739 spin_unlock_bh(&pmc->mca_lock);
1740 }
8965779d 1741 read_unlock_bh(&idev->lock);
1da177e4
LT		 1742 if (skb)
1743 mld_sendpack(skb);
1744}
1745
1746/*
1747 * remove zero-count source records from a source filter list
1748 */
1749static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1750{
1751 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1752
1753 psf_prev = NULL;
1754 for (psf=*ppsf; psf; psf = psf_next) {
1755 psf_next = psf->sf_next;
1756 if (psf->sf_crcount == 0) {
1757 if (psf_prev)
1758 psf_prev->sf_next = psf->sf_next;
1759 else
1760 *ppsf = psf->sf_next;
1761 kfree(psf);
1762 } else
1763 psf_prev = psf;
1764 }
1765}
1766
1767static void mld_send_cr(struct inet6_dev *idev)
1768{
1769 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1770 struct sk_buff *skb = NULL;
1771 int type, dtype;
1772
1773 read_lock_bh(&idev->lock);
6457d26b 1774 spin_lock(&idev->mc_lock);
1da177e4
LT		 1775
1776 /* deleted MCA's */
1777 pmc_prev = NULL;
1778 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1779 pmc_next = pmc->next;
1780 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1781 type = MLD2_BLOCK_OLD_SOURCES;
1782 dtype = MLD2_BLOCK_OLD_SOURCES;
1783 skb = add_grec(skb, pmc, type, 1, 0);
1784 skb = add_grec(skb, pmc, dtype, 1, 1);
1785 }
1786 if (pmc->mca_crcount) {
1da177e4
LT		 1787 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1788 type = MLD2_CHANGE_TO_INCLUDE;
1789 skb = add_grec(skb, pmc, type, 1, 0);
1790 }
5ab4a6c8 1791 pmc->mca_crcount--;
1da177e4
LT		 1792 if (pmc->mca_crcount == 0) {
1793 mld_clear_zeros(&pmc->mca_tomb);
1794 mld_clear_zeros(&pmc->mca_sources);
1795 }
1796 }
1797 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1798 !pmc->mca_sources) {
1799 if (pmc_prev)
1800 pmc_prev->next = pmc_next;
1801 else
1802 idev->mc_tomb = pmc_next;
1803 in6_dev_put(pmc->idev);
1804 kfree(pmc);
1805 } else
1806 pmc_prev = pmc;
1807 }
6457d26b 1808 spin_unlock(&idev->mc_lock);
1da177e4
LT		 1809
1810 /* change recs */
1811 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1812 spin_lock_bh(&pmc->mca_lock);
1813 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1814 type = MLD2_BLOCK_OLD_SOURCES;
1815 dtype = MLD2_ALLOW_NEW_SOURCES;
1816 } else {
1817 type = MLD2_ALLOW_NEW_SOURCES;
1818 dtype = MLD2_BLOCK_OLD_SOURCES;
1819 }
1820 skb = add_grec(skb, pmc, type, 0, 0);
1821 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1822
1823 /* filter mode changes */
1824 if (pmc->mca_crcount) {
1da177e4
LT		 1825 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1826 type = MLD2_CHANGE_TO_EXCLUDE;
1827 else
1828 type = MLD2_CHANGE_TO_INCLUDE;
1829 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1830 pmc->mca_crcount--;
1da177e4
LT		 1831 }
1832 spin_unlock_bh(&pmc->mca_lock);
1833 }
1834 read_unlock_bh(&idev->lock);
1835 if (!skb)
1836 return;
1837 (void) mld_sendpack(skb);
1838}
1839
1840static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1841{
c346dca1 1842 struct net *net = dev_net(dev);
b8ad0cbc 1843 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1844 struct inet6_dev *idev;
1ab1457c 1845 struct sk_buff *skb;
6e7cb837 1846 struct mld_msg *hdr;
d7aabf22 1847 const struct in6_addr *snd_addr, *saddr;
1da177e4 1848 struct in6_addr addr_buf;
a7ae1992
HX		 1849 int hlen = LL_RESERVED_SPACE(dev);
1850 int tlen = dev->needed_tailroom;
1da177e4
LT		 1851 int err, len, payload_len, full_len;
1852 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1853 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1854 IPV6_TLV_PADN, 0 };
4c9483b2 1855 struct flowi6 fl6;
adf30907 1856 struct dst_entry *dst;
1da177e4 1857
f3ee4010
YH		 1858 if (type == ICMPV6_MGM_REDUCTION)
1859 snd_addr = &in6addr_linklocal_allrouters;
1860 else
1861 snd_addr = addr;
1da177e4
LT		 1862
1863 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1864 payload_len = len + sizeof(ra);
1865 full_len = sizeof(struct ipv6hdr) + payload_len;
1866
edf391ff
NH		 1867 rcu_read_lock();
1868 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1869 IPSTATS_MIB_OUT, full_len);
1870 rcu_read_unlock();
1871
a7ae1992 1872 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1da177e4
LT		 1873
1874 if (skb == NULL) {
a11d206d 1875 rcu_read_lock();
3bd653c8 1876 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH		 1877 IPSTATS_MIB_OUTDISCARDS);
1878 rcu_read_unlock();
1da177e4
LT		 1879 return;
1880 }
9d4a0314 1881 skb->priority = TC_PRIO_CONTROL;
a7ae1992 1882 skb_reserve(skb, hlen);
1da177e4 1883
95c385b4 1884 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1885 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1886 * use unspecified address as the source address
1da177e4
LT		 1887 * when a valid link-local address is not available.
1888 */
d7aabf22
YH		 1889 saddr = &in6addr_any;
1890 } else
1891 saddr = &addr_buf;
1da177e4 1892
2576f17d 1893 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4
LT		 1894
1895 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1896
6e7cb837
YH		 1897 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1898 memset(hdr, 0, sizeof(struct mld_msg));
1899 hdr->mld_type = type;
4e3fd7a0 1900 hdr->mld_mca = *addr;
1da177e4 1901
6e7cb837
YH		 1902 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1903 IPPROTO_ICMPV6,
1904 csum_partial(hdr, len, 0));
1da177e4 1905
96b52e61
ED		 1906 rcu_read_lock();
1907 idev = __in6_dev_get(skb->dev);
1da177e4 1908
4c9483b2 1909 icmpv6_flow_init(sk, &fl6, type,
41927178
YH		 1910 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1911 skb->dev->ifindex);
12fd84f4 1912 dst = icmp6_dst_alloc(skb->dev, &fl6);
452edd59
DM		 1913 if (IS_ERR(dst)) {
1914 err = PTR_ERR(dst);
41927178 1915 goto err_out;
452edd59 1916 }
41927178 1917
adf30907 1918 skb_dst_set(skb, dst);
b2e0b385 1919 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1920 dst_output);
1921out:
1da177e4 1922 if (!err) {
5c5d244b 1923 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 1924 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1925 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1da177e4 1926 } else
3bd653c8 1927 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 1928
96b52e61 1929 rcu_read_unlock();
1da177e4 1930 return;
41927178
YH		 1931
1932err_out:
1933 kfree_skb(skb);
1934 goto out;
1da177e4
LT		 1935}
1936
b173ee48
HFS		 1937static void mld_resend_report(struct inet6_dev *idev)
1938{
6c567b78 1939 if (mld_in_v1_mode(idev)) {
b173ee48
HFS		 1940 struct ifmcaddr6 *mcaddr;
1941 read_lock_bh(&idev->lock);
1942 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1943 if (!(mcaddr->mca_flags & MAF_NOREPORT))
1944 igmp6_send(&mcaddr->mca_addr, idev->dev,
1945 ICMPV6_MGM_REPORT);
1946 }
1947 read_unlock_bh(&idev->lock);
1948 } else {
1949 mld_send_report(idev, NULL);
1950 }
1951}
1952
1953void ipv6_mc_dad_complete(struct inet6_dev *idev)
1954{
1955 idev->mc_dad_count = idev->mc_qrv;
1956 if (idev->mc_dad_count) {
1957 mld_resend_report(idev);
1958 idev->mc_dad_count--;
1959 if (idev->mc_dad_count)
1960 mld_dad_start_timer(idev, idev->mc_maxdelay);
1961 }
1962}
1963
1964static void mld_dad_timer_expire(unsigned long data)
1965{
1966 struct inet6_dev *idev = (struct inet6_dev *)data;
1967
1968 mld_resend_report(idev);
1969 if (idev->mc_dad_count) {
1970 idev->mc_dad_count--;
1971 if (idev->mc_dad_count)
1972 mld_dad_start_timer(idev, idev->mc_maxdelay);
1973 }
1974 __in6_dev_put(idev);
1975}
1976
1da177e4 1977static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
b71d1d42 1978 const struct in6_addr *psfsrc)
1da177e4
LT		 1979{
1980 struct ip6_sf_list *psf, *psf_prev;
1981 int rv = 0;
1982
1983 psf_prev = NULL;
1984 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1985 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1986 break;
1987 psf_prev = psf;
1988 }
1989 if (!psf || psf->sf_count[sfmode] == 0) {
1990 /* source filter not found, or count wrong => bug */
1991 return -ESRCH;
1992 }
1993 psf->sf_count[sfmode]--;
1994 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1995 struct inet6_dev *idev = pmc->idev;
1996
1997 /* no more filters for this source */
1998 if (psf_prev)
1999 psf_prev->sf_next = psf->sf_next;
2000 else
2001 pmc->mca_sources = psf->sf_next;
2002 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
6c567b78 2003 !mld_in_v1_mode(idev)) {
1da177e4
LT		 2004 psf->sf_crcount = idev->mc_qrv;
2005 psf->sf_next = pmc->mca_tomb;
2006 pmc->mca_tomb = psf;
2007 rv = 1;
2008 } else
2009 kfree(psf);
2010 }
2011 return rv;
2012}
2013
b71d1d42
ED		 2014static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2015 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 2016 int delta)
2017{
2018 struct ifmcaddr6 *pmc;
2019 int changerec = 0;
2020 int i, err;
2021
2022 if (!idev)
2023 return -ENODEV;
2024 read_lock_bh(&idev->lock);
2025 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2026 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2027 break;
2028 }
2029 if (!pmc) {
2030 /* MCA not found?? bug */
2031 read_unlock_bh(&idev->lock);
2032 return -ESRCH;
2033 }
2034 spin_lock_bh(&pmc->mca_lock);
2035 sf_markstate(pmc);
2036 if (!delta) {
2037 if (!pmc->mca_sfcount[sfmode]) {
2038 spin_unlock_bh(&pmc->mca_lock);
2039 read_unlock_bh(&idev->lock);
2040 return -EINVAL;
2041 }
2042 pmc->mca_sfcount[sfmode]--;
2043 }
2044 err = 0;
2045 for (i=0; i<sfcount; i++) {
2046 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2047
2048 changerec |= rv > 0;
2049 if (!err && rv < 0)
2050 err = rv;
2051 }
2052 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2053 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2054 pmc->mca_sfcount[MCAST_INCLUDE]) {
2055 struct ip6_sf_list *psf;
2056
2057 /* filter mode change */
2058 pmc->mca_sfmode = MCAST_INCLUDE;
2059 pmc->mca_crcount = idev->mc_qrv;
2060 idev->mc_ifc_count = pmc->mca_crcount;
2061 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2062 psf->sf_crcount = 0;
2063 mld_ifc_event(pmc->idev);
2064 } else if (sf_setstate(pmc) || changerec)
2065 mld_ifc_event(pmc->idev);
2066 spin_unlock_bh(&pmc->mca_lock);
2067 read_unlock_bh(&idev->lock);
2068 return err;
2069}
2070
2071/*
2072 * Add multicast single-source filter to the interface list
2073 */
2074static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
99d2f47a 2075 const struct in6_addr *psfsrc)
1da177e4
LT		 2076{
2077 struct ip6_sf_list *psf, *psf_prev;
2078
2079 psf_prev = NULL;
2080 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2081 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2082 break;
2083 psf_prev = psf;
2084 }
2085 if (!psf) {
0c600eda 2086 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 2087 if (!psf)
2088 return -ENOBUFS;
0c600eda 2089
1da177e4
LT		 2090 psf->sf_addr = *psfsrc;
2091 if (psf_prev) {
2092 psf_prev->sf_next = psf;
2093 } else
2094 pmc->mca_sources = psf;
2095 }
2096 psf->sf_count[sfmode]++;
2097 return 0;
2098}
2099
2100static void sf_markstate(struct ifmcaddr6 *pmc)
2101{
2102 struct ip6_sf_list *psf;
2103 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2104
2105 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2106 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2107 psf->sf_oldin = mca_xcount ==
2108 psf->sf_count[MCAST_EXCLUDE] &&
2109 !psf->sf_count[MCAST_INCLUDE];
2110 } else
2111 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2112}
2113
2114static int sf_setstate(struct ifmcaddr6 *pmc)
2115{
7add2a43 2116 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 2117 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2118 int qrv = pmc->idev->mc_qrv;
2119 int new_in, rv;
2120
2121 rv = 0;
2122 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2123 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2124 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2125 !psf->sf_count[MCAST_INCLUDE];
2126 } else
2127 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 2128 if (new_in) {
2129 if (!psf->sf_oldin) {
e80e28b6 2130 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 2131
2132 for (dpsf=pmc->mca_tomb; dpsf;
2133 dpsf=dpsf->sf_next) {
2134 if (ipv6_addr_equal(&dpsf->sf_addr,
2135 &psf->sf_addr))
2136 break;
2137 prev = dpsf;
2138 }
2139 if (dpsf) {
2140 if (prev)
2141 prev->sf_next = dpsf->sf_next;
2142 else
2143 pmc->mca_tomb = dpsf->sf_next;
2144 kfree(dpsf);
2145 }
2146 psf->sf_crcount = qrv;
2147 rv++;
2148 }
2149 } else if (psf->sf_oldin) {
2150 psf->sf_crcount = 0;
2151 /*
2152 * add or update "delete" records if an active filter
2153 * is now inactive
2154 */
2155 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2156 if (ipv6_addr_equal(&dpsf->sf_addr,
2157 &psf->sf_addr))
2158 break;
2159 if (!dpsf) {
5d55354f 2160 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
7add2a43
DS		 2161 if (!dpsf)
2162 continue;
2163 *dpsf = *psf;
2164 /* pmc->mca_lock held by callers */
2165 dpsf->sf_next = pmc->mca_tomb;
2166 pmc->mca_tomb = dpsf;
2167 }
2168 dpsf->sf_crcount = qrv;
1da177e4
LT		 2169 rv++;
2170 }
2171 }
2172 return rv;
2173}
2174
2175/*
2176 * Add multicast source filter list to the interface list
2177 */
b71d1d42
ED		 2178static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2179 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 2180 int delta)
2181{
2182 struct ifmcaddr6 *pmc;
2183 int isexclude;
2184 int i, err;
2185
2186 if (!idev)
2187 return -ENODEV;
2188 read_lock_bh(&idev->lock);
2189 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2190 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2191 break;
2192 }
2193 if (!pmc) {
2194 /* MCA not found?? bug */
2195 read_unlock_bh(&idev->lock);
2196 return -ESRCH;
2197 }
2198 spin_lock_bh(&pmc->mca_lock);
2199
2200 sf_markstate(pmc);
2201 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2202 if (!delta)
2203 pmc->mca_sfcount[sfmode]++;
2204 err = 0;
2205 for (i=0; i<sfcount; i++) {
99d2f47a 2206 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT		 2207 if (err)
2208 break;
2209 }
2210 if (err) {
2211 int j;
2212
2213 if (!delta)
2214 pmc->mca_sfcount[sfmode]--;
2215 for (j=0; j<i; j++)
78d50217 2216 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4 2217 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT		 2218 struct ip6_sf_list *psf;
2219
2220 /* filter mode change */
2221 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2222 pmc->mca_sfmode = MCAST_EXCLUDE;
2223 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2224 pmc->mca_sfmode = MCAST_INCLUDE;
2225 /* else no filters; keep old mode for reports */
2226
2227 pmc->mca_crcount = idev->mc_qrv;
2228 idev->mc_ifc_count = pmc->mca_crcount;
2229 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2230 psf->sf_crcount = 0;
2231 mld_ifc_event(idev);
2232 } else if (sf_setstate(pmc))
2233 mld_ifc_event(idev);
2234 spin_unlock_bh(&pmc->mca_lock);
2235 read_unlock_bh(&idev->lock);
2236 return err;
2237}
2238
2239static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2240{
2241 struct ip6_sf_list *psf, *nextpsf;
2242
2243 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2244 nextpsf = psf->sf_next;
2245 kfree(psf);
2246 }
2247 pmc->mca_tomb = NULL;
2248 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2249 nextpsf = psf->sf_next;
2250 kfree(psf);
2251 }
2252 pmc->mca_sources = NULL;
2253 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2254 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2255 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2256}
2257
2258
2259static void igmp6_join_group(struct ifmcaddr6 *ma)
2260{
2261 unsigned long delay;
2262
2263 if (ma->mca_flags & MAF_NOREPORT)
2264 return;
2265
2266 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2267
fc4eba58 2268 delay = net_random() % unsolicited_report_interval(ma->idev);
1da177e4
LT		 2269
2270 spin_lock_bh(&ma->mca_lock);
2271 if (del_timer(&ma->mca_timer)) {
2272 atomic_dec(&ma->mca_refcnt);
2273 delay = ma->mca_timer.expires - jiffies;
2274 }
2275
2276 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2277 atomic_inc(&ma->mca_refcnt);
2278 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2279 spin_unlock_bh(&ma->mca_lock);
2280}
2281
2282static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2283 struct inet6_dev *idev)
2284{
2285 int err;
2286
5ab4a6c8
DS		 2287 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2288 * so no other readers or writers of iml or its sflist
2289 */
cfcabdcc 2290 if (!iml->sflist) {
1da177e4
LT		 2291 /* any-source empty exclude case */
2292 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2293 }
2294 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2295 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2296 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2297 iml->sflist = NULL;
2298 return err;
2299}
2300
2301static void igmp6_leave_group(struct ifmcaddr6 *ma)
2302{
6c567b78 2303 if (mld_in_v1_mode(ma->idev)) {
1da177e4
LT		 2304 if (ma->mca_flags & MAF_LAST_REPORTER)
2305 igmp6_send(&ma->mca_addr, ma->idev->dev,
2306 ICMPV6_MGM_REDUCTION);
2307 } else {
2308 mld_add_delrec(ma->idev, ma);
2309 mld_ifc_event(ma->idev);
2310 }
2311}
2312
2313static void mld_gq_timer_expire(unsigned long data)
2314{
2315 struct inet6_dev *idev = (struct inet6_dev *)data;
2316
2317 idev->mc_gq_running = 0;
2318 mld_send_report(idev, NULL);
2319 __in6_dev_put(idev);
2320}
2321
2322static void mld_ifc_timer_expire(unsigned long data)
2323{
2324 struct inet6_dev *idev = (struct inet6_dev *)data;
2325
2326 mld_send_cr(idev);
2327 if (idev->mc_ifc_count) {
2328 idev->mc_ifc_count--;
2329 if (idev->mc_ifc_count)
2330 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2331 }
2332 __in6_dev_put(idev);
2333}
2334
2335static void mld_ifc_event(struct inet6_dev *idev)
2336{
6c567b78 2337 if (mld_in_v1_mode(idev))
1da177e4
LT		 2338 return;
2339 idev->mc_ifc_count = idev->mc_qrv;
2340 mld_ifc_start_timer(idev, 1);
2341}
2342
2343
2344static void igmp6_timer_handler(unsigned long data)
2345{
2346 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2347
6c567b78 2348 if (mld_in_v1_mode(ma->idev))
1da177e4
LT		 2349 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2350 else
2351 mld_send_report(ma->idev, ma);
2352
2353 spin_lock(&ma->mca_lock);
2354 ma->mca_flags |= MAF_LAST_REPORTER;
2355 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2356 spin_unlock(&ma->mca_lock);
2357 ma_put(ma);
2358}
2359
75c78500
MS		 2360/* Device changing type */
2361
2362void ipv6_mc_unmap(struct inet6_dev *idev)
2363{
2364 struct ifmcaddr6 *i;
2365
2366 /* Install multicast list, except for all-nodes (already installed) */
2367
2368 read_lock_bh(&idev->lock);
2369 for (i = idev->mc_list; i; i = i->next)
2370 igmp6_group_dropped(i);
2371 read_unlock_bh(&idev->lock);
2372}
2373
2374void ipv6_mc_remap(struct inet6_dev *idev)
2375{
2376 ipv6_mc_up(idev);
2377}
2378
1da177e4
LT		 2379/* Device going down */
2380
2381void ipv6_mc_down(struct inet6_dev *idev)
2382{
2383 struct ifmcaddr6 *i;
2384
2385 /* Withdraw multicast list */
2386
2387 read_lock_bh(&idev->lock);
2388 idev->mc_ifc_count = 0;
2389 if (del_timer(&idev->mc_ifc_timer))
2390 __in6_dev_put(idev);
2391 idev->mc_gq_running = 0;
2392 if (del_timer(&idev->mc_gq_timer))
2393 __in6_dev_put(idev);
b173ee48
HFS		 2394 if (del_timer(&idev->mc_dad_timer))
2395 __in6_dev_put(idev);
1da177e4
LT		 2396
2397 for (i = idev->mc_list; i; i=i->next)
2398 igmp6_group_dropped(i);
2399 read_unlock_bh(&idev->lock);
2400
2401 mld_clear_delrec(idev);
2402}
2403
2404
2405/* Device going up */
2406
2407void ipv6_mc_up(struct inet6_dev *idev)
2408{
2409 struct ifmcaddr6 *i;
2410
2411 /* Install multicast list, except for all-nodes (already installed) */
2412
2413 read_lock_bh(&idev->lock);
2414 for (i = idev->mc_list; i; i=i->next)
2415 igmp6_group_added(i);
2416 read_unlock_bh(&idev->lock);
2417}
2418
2419/* IPv6 device initialization. */
2420
2421void ipv6_mc_init_dev(struct inet6_dev *idev)
2422{
1da177e4 2423 write_lock_bh(&idev->lock);
6457d26b 2424 spin_lock_init(&idev->mc_lock);
1da177e4 2425 idev->mc_gq_running = 0;
b24b8a24
PE		 2426 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2427 (unsigned long)idev);
1da177e4
LT		 2428 idev->mc_tomb = NULL;
2429 idev->mc_ifc_count = 0;
b24b8a24
PE		 2430 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2431 (unsigned long)idev);
b173ee48
HFS		 2432 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2433 (unsigned long)idev);
89225d1c 2434
1da177e4 2435 idev->mc_qrv = MLD_QRV_DEFAULT;
89225d1c
DB		 2436 idev->mc_qi = MLD_QI_DEFAULT;
2437 idev->mc_qri = MLD_QRI_DEFAULT;
2438
fc4eba58 2439 idev->mc_maxdelay = unsolicited_report_interval(idev);
1da177e4
LT		 2440 idev->mc_v1_seen = 0;
2441 write_unlock_bh(&idev->lock);
1da177e4
LT		 2442}
2443
2444/*
2445 * Device is about to be destroyed: clean up.
2446 */
2447
2448void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2449{
2450 struct ifmcaddr6 *i;
1da177e4
LT		 2451
2452 /* Deactivate timers */
2453 ipv6_mc_down(idev);
2454
2455 /* Delete all-nodes address. */
1da177e4
LT		 2456 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2457 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2458 * fail.
2459 */
f3ee4010 2460 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2461
f3ee4010
YH		 2462 if (idev->cnf.forwarding)
2463 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT		 2464
2465 write_lock_bh(&idev->lock);
2466 while ((i = idev->mc_list) != NULL) {
2467 idev->mc_list = i->next;
2468 write_unlock_bh(&idev->lock);
2469
2470 igmp6_group_dropped(i);
2471 ma_put(i);
2472
2473 write_lock_bh(&idev->lock);
2474 }
2475 write_unlock_bh(&idev->lock);
2476}
2477
2478#ifdef CONFIG_PROC_FS
2479struct igmp6_mc_iter_state {
b8ad0cbc 2480 struct seq_net_private p;
1da177e4
LT		 2481 struct net_device *dev;
2482 struct inet6_dev *idev;
2483};
2484
2485#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2486
2487static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2488{
2489 struct ifmcaddr6 *im = NULL;
2490 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2491 struct net *net = seq_file_net(seq);
1da177e4 2492
7562f876 2493 state->idev = NULL;
ce81b76a 2494 for_each_netdev_rcu(net, state->dev) {
1da177e4 2495 struct inet6_dev *idev;
ce81b76a 2496 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2497 if (!idev)
2498 continue;
2499 read_lock_bh(&idev->lock);
2500 im = idev->mc_list;
2501 if (im) {
2502 state->idev = idev;
2503 break;
2504 }
2505 read_unlock_bh(&idev->lock);
1da177e4
LT		 2506 }
2507 return im;
2508}
2509
2510static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2511{
2512 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2513
2514 im = im->next;
2515 while (!im) {
ce81b76a 2516 if (likely(state->idev != NULL))
1da177e4 2517 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2518
2519 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2520 if (!state->dev) {
2521 state->idev = NULL;
2522 break;
2523 }
ce81b76a 2524 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2525 if (!state->idev)
2526 continue;
2527 read_lock_bh(&state->idev->lock);
2528 im = state->idev->mc_list;
2529 }
2530 return im;
2531}
2532
2533static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2534{
2535 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2536 if (im)
2537 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2538 --pos;
2539 return pos ? NULL : im;
2540}
2541
2542static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2543 __acquires(RCU)
1da177e4 2544{
ce81b76a 2545 rcu_read_lock();
1da177e4
LT		 2546 return igmp6_mc_get_idx(seq, *pos);
2547}
2548
2549static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2550{
ce81b76a
ED		 2551 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2552
1da177e4
LT		 2553 ++*pos;
2554 return im;
2555}
2556
2557static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2558 __releases(RCU)
1da177e4
LT		 2559{
2560 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2561
1da177e4
LT		 2562 if (likely(state->idev != NULL)) {
2563 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2564 state->idev = NULL;
2565 }
2566 state->dev = NULL;
ce81b76a 2567 rcu_read_unlock();
1da177e4
LT		 2568}
2569
2570static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2571{
2572 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2573 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2574
2575 seq_printf(seq,
4b7a4274 2576 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2577 state->dev->ifindex, state->dev->name,
b071195d 2578 &im->mca_addr,
1da177e4
LT		 2579 im->mca_users, im->mca_flags,
2580 (im->mca_flags&MAF_TIMER_RUNNING) ?
2581 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2582 return 0;
2583}
2584
56b3d975 2585static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2586 .start = igmp6_mc_seq_start,
2587 .next = igmp6_mc_seq_next,
2588 .stop = igmp6_mc_seq_stop,
2589 .show = igmp6_mc_seq_show,
2590};
2591
2592static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2593{
b8ad0cbc
DL		 2594 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2595 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2596}
2597
9a32144e 2598static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2599 .owner = THIS_MODULE,
2600 .open = igmp6_mc_seq_open,
2601 .read = seq_read,
2602 .llseek = seq_lseek,
b8ad0cbc 2603 .release = seq_release_net,
1da177e4
LT		 2604};
2605
2606struct igmp6_mcf_iter_state {
b8ad0cbc 2607 struct seq_net_private p;
1da177e4
LT		 2608 struct net_device *dev;
2609 struct inet6_dev *idev;
2610 struct ifmcaddr6 *im;
2611};
2612
2613#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2614
2615static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2616{
2617 struct ip6_sf_list *psf = NULL;
2618 struct ifmcaddr6 *im = NULL;
2619 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2620 struct net *net = seq_file_net(seq);
1da177e4 2621
7562f876
PE		 2622 state->idev = NULL;
2623 state->im = NULL;
ce81b76a 2624 for_each_netdev_rcu(net, state->dev) {
1da177e4 2625 struct inet6_dev *idev;
ce81b76a 2626 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2627 if (unlikely(idev == NULL))
2628 continue;
2629 read_lock_bh(&idev->lock);
2630 im = idev->mc_list;
2631 if (likely(im != NULL)) {
2632 spin_lock_bh(&im->mca_lock);
2633 psf = im->mca_sources;
2634 if (likely(psf != NULL)) {
2635 state->im = im;
2636 state->idev = idev;
2637 break;
2638 }
2639 spin_unlock_bh(&im->mca_lock);
2640 }
2641 read_unlock_bh(&idev->lock);
1da177e4
LT		 2642 }
2643 return psf;
2644}
2645
2646static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2647{
2648 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2649
2650 psf = psf->sf_next;
2651 while (!psf) {
2652 spin_unlock_bh(&state->im->mca_lock);
2653 state->im = state->im->next;
2654 while (!state->im) {
ce81b76a 2655 if (likely(state->idev != NULL))
1da177e4 2656 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2657
2658 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2659 if (!state->dev) {
2660 state->idev = NULL;
2661 goto out;
2662 }
ce81b76a 2663 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2664 if (!state->idev)
2665 continue;
2666 read_lock_bh(&state->idev->lock);
2667 state->im = state->idev->mc_list;
2668 }
2669 if (!state->im)
2670 break;
2671 spin_lock_bh(&state->im->mca_lock);
2672 psf = state->im->mca_sources;
2673 }
2674out:
2675 return psf;
2676}
2677
2678static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2679{
2680 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2681 if (psf)
2682 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2683 --pos;
2684 return pos ? NULL : psf;
2685}
2686
2687static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2688 __acquires(RCU)
1da177e4 2689{
ce81b76a 2690 rcu_read_lock();
1da177e4
LT		 2691 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2692}
2693
2694static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2695{
2696 struct ip6_sf_list *psf;
2697 if (v == SEQ_START_TOKEN)
2698 psf = igmp6_mcf_get_first(seq);
2699 else
2700 psf = igmp6_mcf_get_next(seq, v);
2701 ++*pos;
2702 return psf;
2703}
2704
2705static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2706 __releases(RCU)
1da177e4
LT		 2707{
2708 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2709 if (likely(state->im != NULL)) {
2710 spin_unlock_bh(&state->im->mca_lock);
2711 state->im = NULL;
2712 }
2713 if (likely(state->idev != NULL)) {
2714 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2715 state->idev = NULL;
2716 }
2717 state->dev = NULL;
ce81b76a 2718 rcu_read_unlock();
1da177e4
LT		 2719}
2720
2721static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2722{
2723 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2724 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2725
2726 if (v == SEQ_START_TOKEN) {
1ab1457c 2727 seq_printf(seq,
1da177e4 2728 "%3s %6s "
9343e79a 2729 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2730 "Device", "Multicast Address",
2731 "Source Address", "INC", "EXC");
2732 } else {
2733 seq_printf(seq,
4b7a4274 2734 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 2735 state->dev->ifindex, state->dev->name,
b071195d
HH		 2736 &state->im->mca_addr,
2737 &psf->sf_addr,
1da177e4
LT		 2738 psf->sf_count[MCAST_INCLUDE],
2739 psf->sf_count[MCAST_EXCLUDE]);
2740 }
2741 return 0;
2742}
2743
56b3d975 2744static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2745 .start = igmp6_mcf_seq_start,
2746 .next = igmp6_mcf_seq_next,
2747 .stop = igmp6_mcf_seq_stop,
2748 .show = igmp6_mcf_seq_show,
2749};
2750
2751static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2752{
b8ad0cbc
DL		 2753 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2754 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2755}
2756
9a32144e 2757static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2758 .owner = THIS_MODULE,
2759 .open = igmp6_mcf_seq_open,
2760 .read = seq_read,
2761 .llseek = seq_lseek,
b8ad0cbc 2762 .release = seq_release_net,
1da177e4 2763};
ea82edf7 2764
2c8c1e72 2765static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL		 2766{
2767 int err;
2768
2769 err = -ENOMEM;
d4beaa66 2770 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
ea82edf7 2771 goto out;
d4beaa66
G		 2772 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2773 &igmp6_mcf_seq_fops))
ea82edf7
DL		 2774 goto out_proc_net_igmp6;
2775
2776 err = 0;
2777out:
2778 return err;
2779
2780out_proc_net_igmp6:
ece31ffd 2781 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL		 2782 goto out;
2783}
2784
2c8c1e72 2785static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7 2786{
ece31ffd
G		 2787 remove_proc_entry("mcfilter6", net->proc_net);
2788 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL		 2789}
2790#else
2c8c1e72 2791static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL		 2792{
2793 return 0;
2794}
2c8c1e72 2795static inline void igmp6_proc_exit(struct net *net)
ea82edf7 2796{
ea82edf7 2797}
1da177e4
LT		 2798#endif
2799
2c8c1e72 2800static int __net_init igmp6_net_init(struct net *net)
1da177e4 2801{
1da177e4
LT		 2802 int err;
2803
1ed8516f
DL		 2804 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2805 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4 2806 if (err < 0) {
f3213831 2807 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
1da177e4 2808 err);
b8ad0cbc 2809 goto out;
1da177e4
LT		 2810 }
2811
1ed8516f 2812 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2813
ea82edf7
DL		 2814 err = igmp6_proc_init(net);
2815 if (err)
b8ad0cbc 2816 goto out_sock_create;
b8ad0cbc
DL		 2817out:
2818 return err;
2819
2820out_sock_create:
1ed8516f 2821 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2822 goto out;
1da177e4
LT		 2823}
2824
2c8c1e72 2825static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 2826{
1ed8516f 2827 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2828 igmp6_proc_exit(net);
1da177e4 2829}
b8ad0cbc
DL		 2830
2831static struct pernet_operations igmp6_net_ops = {
2832 .init = igmp6_net_init,
2833 .exit = igmp6_net_exit,
2834};
2835
2836int __init igmp6_init(void)
2837{
2838 return register_pernet_subsys(&igmp6_net_ops);
2839}
2840
2841void igmp6_cleanup(void)
2842{
2843 unregister_pernet_subsys(&igmp6_net_ops);
2844}
Linux 6.x block layer and io_uring tree(s)