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f2fs: Provide a splice-read wrapper
[linux-block.git] / net / ipv6 / mcast.c
CommitLineData
2874c5fd 1// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4
LT		 2/*
3 * Multicast support for IPv6
1ab1457c 4 * Linux INET6 implementation
1da177e4
LT		 5 *
6 * Authors:
1ab1457c 7 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 8 *
1ab1457c 9 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
1da177e4
LT		 10 */
11
12/* Changes:
13 *
14 * yoshfuji : fix format of router-alert option
15 * YOSHIFUJI Hideaki @USAGI:
16 * Fixed source address for MLD message based on
17 * <draft-ietf-magma-mld-source-05.txt>.
18 * YOSHIFUJI Hideaki @USAGI:
19 * - Ignore Queries for invalid addresses.
20 * - MLD for link-local addresses.
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - MLDv2 support
23 */
24
1da177e4
LT		 25#include <linux/module.h>
26#include <linux/errno.h>
27#include <linux/types.h>
28#include <linux/string.h>
29#include <linux/socket.h>
30#include <linux/sockios.h>
31#include <linux/jiffies.h>
1da177e4
LT		 32#include <linux/net.h>
33#include <linux/in.h>
34#include <linux/in6.h>
35#include <linux/netdevice.h>
36#include <linux/if_arp.h>
37#include <linux/route.h>
38#include <linux/init.h>
39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
5a0e3ad6 41#include <linux/slab.h>
9d4a0314 42#include <linux/pkt_sched.h>
6e7cb837 43#include <net/mld.h>
2d9a93b4 44#include <linux/workqueue.h>
1da177e4
LT		 45
46#include <linux/netfilter.h>
47#include <linux/netfilter_ipv6.h>
48
457c4cbc 49#include <net/net_namespace.h>
1da177e4
LT		 50#include <net/sock.h>
51#include <net/snmp.h>
52
53#include <net/ipv6.h>
54#include <net/protocol.h>
55#include <net/if_inet6.h>
56#include <net/ndisc.h>
57#include <net/addrconf.h>
58#include <net/ip6_route.h>
1ed8516f 59#include <net/inet_common.h>
1da177e4
LT		 60
61#include <net/ip6_checksum.h>
62
6e7cb837 63/* Ensure that we have struct in6_addr aligned on 32bit word. */
32b395a1
MY		 64static int __mld2_query_bugs[] __attribute__((__unused__)) = {
65 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
66 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
67 BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
1da177e4
LT		 68};
69
2d9a93b4 70static struct workqueue_struct *mld_wq;
1da177e4
LT		 71static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
72
1da177e4
LT		 73static void igmp6_join_group(struct ifmcaddr6 *ma);
74static void igmp6_leave_group(struct ifmcaddr6 *ma);
2d9a93b4 75static void mld_mca_work(struct work_struct *work);
1da177e4 76
1da177e4 77static void mld_ifc_event(struct inet6_dev *idev);
6c567b78 78static bool mld_in_v1_mode(const struct inet6_dev *idev);
1da177e4
LT		 79static int sf_setstate(struct ifmcaddr6 *pmc);
80static void sf_markstate(struct ifmcaddr6 *pmc);
81static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
b71d1d42
ED		 82static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
83 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4 84 int delta);
b71d1d42
ED		 85static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
86 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 87 int delta);
88static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
89 struct inet6_dev *idev);
c7ea20c9
HL		 90static int __ipv6_dev_mc_inc(struct net_device *dev,
91 const struct in6_addr *addr, unsigned int mode);
1da177e4 92
1da177e4 93#define MLD_QRV_DEFAULT 2
89225d1c
DB		 94/* RFC3810, 9.2. Query Interval */
95#define MLD_QI_DEFAULT (125 * HZ)
96/* RFC3810, 9.3. Query Response Interval */
97#define MLD_QRI_DEFAULT (10 * HZ)
1da177e4 98
9fd07841
DB		 99/* RFC3810, 8.1 Query Version Distinctions */
100#define MLD_V1_QUERY_LEN 24
101#define MLD_V2_QUERY_LEN_MIN 28
102
6f4353d8 103#define IPV6_MLD_MAX_MSF 64
1da177e4 104
ab32ea5d 105int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
2f711939 106int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
1da177e4
LT		 107
108/*
109 * socket join on multicast group
110 */
63ed8de4
TY		 111#define mc_dereference(e, idev) \
112 rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock))
1da177e4 113
4b4b8446
TY		 114#define sock_dereference(e, sk) \
115 rcu_dereference_protected(e, lockdep_sock_is_held(sk))
116
117#define for_each_pmc_socklock(np, sk, pmc) \
118 for (pmc = sock_dereference((np)->ipv6_mc_list, sk); \
88e2ca30 119 pmc; \
4b4b8446 120 pmc = sock_dereference(pmc->next, sk))
88e2ca30 121
456b61bc 122#define for_each_pmc_rcu(np, pmc) \
4b200e39
TY		 123 for (pmc = rcu_dereference((np)->ipv6_mc_list); \
124 pmc; \
456b61bc
ED		 125 pmc = rcu_dereference(pmc->next))
126
63ed8de4
TY		 127#define for_each_psf_mclock(mc, psf) \
128 for (psf = mc_dereference((mc)->mca_sources, mc->idev); \
4b200e39 129 psf; \
63ed8de4 130 psf = mc_dereference(psf->sf_next, mc->idev))
4b200e39
TY		 131
132#define for_each_psf_rcu(mc, psf) \
133 for (psf = rcu_dereference((mc)->mca_sources); \
134 psf; \
135 psf = rcu_dereference(psf->sf_next))
136
137#define for_each_psf_tomb(mc, psf) \
63ed8de4 138 for (psf = mc_dereference((mc)->mca_tomb, mc->idev); \
4b200e39 139 psf; \
63ed8de4 140 psf = mc_dereference(psf->sf_next, mc->idev))
4b200e39 141
63ed8de4
TY		 142#define for_each_mc_mclock(idev, mc) \
143 for (mc = mc_dereference((idev)->mc_list, idev); \
88e2ca30 144 mc; \
63ed8de4 145 mc = mc_dereference(mc->next, idev))
88e2ca30
TY		 146
147#define for_each_mc_rcu(idev, mc) \
148 for (mc = rcu_dereference((idev)->mc_list); \
149 mc; \
150 mc = rcu_dereference(mc->next))
151
152#define for_each_mc_tomb(idev, mc) \
63ed8de4 153 for (mc = mc_dereference((idev)->mc_tomb, idev); \
88e2ca30 154 mc; \
63ed8de4 155 mc = mc_dereference(mc->next, idev))
88e2ca30 156
fc4eba58
HFS		 157static int unsolicited_report_interval(struct inet6_dev *idev)
158{
159 int iv;
160
6c567b78 161 if (mld_in_v1_mode(idev))
fc4eba58
HFS		 162 iv = idev->cnf.mldv1_unsolicited_report_interval;
163 else
164 iv = idev->cnf.mldv2_unsolicited_report_interval;
165
166 return iv > 0 ? iv : 1;
167}
168
c7ea20c9
HL		 169static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
170 const struct in6_addr *addr, unsigned int mode)
1da177e4
LT		 171{
172 struct net_device *dev = NULL;
173 struct ipv6_mc_socklist *mc_lst;
174 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 175 struct net *net = sock_net(sk);
1da177e4
LT		 176 int err;
177
46a4dee0
MC		 178 ASSERT_RTNL();
179
1da177e4
LT		 180 if (!ipv6_addr_is_multicast(addr))
181 return -EINVAL;
182
4b4b8446 183 for_each_pmc_socklock(np, sk, mc_lst) {
c9e3e8b6 184 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
88e2ca30 185 ipv6_addr_equal(&mc_lst->addr, addr))
c9e3e8b6 186 return -EADDRINUSE;
c9e3e8b6 187 }
c9e3e8b6 188
1da177e4
LT		 189 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
190
63159f29 191 if (!mc_lst)
1da177e4
LT		 192 return -ENOMEM;
193
194 mc_lst->next = NULL;
4e3fd7a0 195 mc_lst->addr = *addr;
1da177e4
LT		 196
197 if (ifindex == 0) {
198 struct rt6_info *rt;
b75cc8f9 199 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
1da177e4 200 if (rt) {
d1918542 201 dev = rt->dst.dev;
94e187c0 202 ip6_rt_put(rt);
1da177e4
LT		 203 }
204 } else
414b6c94 205 dev = __dev_get_by_index(net, ifindex);
1da177e4 206
63159f29 207 if (!dev) {
1da177e4
LT		 208 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
209 return -ENODEV;
210 }
211
212 mc_lst->ifindex = dev->ifindex;
c7ea20c9 213 mc_lst->sfmode = mode;
882ba1f7 214 RCU_INIT_POINTER(mc_lst->sflist, NULL);
1da177e4
LT		 215
216 /*
217 * now add/increase the group membership on the device
218 */
219
c7ea20c9 220 err = __ipv6_dev_mc_inc(dev, addr, mode);
1da177e4
LT		 221
222 if (err) {
223 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
1da177e4
LT		 224 return err;
225 }
226
1da177e4 227 mc_lst->next = np->ipv6_mc_list;
456b61bc 228 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
1da177e4 229
46a4dee0
MC		 230 return 0;
231}
c7ea20c9
HL		 232
233int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
234{
235 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
236}
46a4dee0 237EXPORT_SYMBOL(ipv6_sock_mc_join);
1da177e4 238
c7ea20c9
HL		 239int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
240 const struct in6_addr *addr, unsigned int mode)
241{
242 return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
243}
244
1da177e4
LT		 245/*
246 * socket leave on multicast group
247 */
54ff9ef3 248int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 249{
250 struct ipv6_pinfo *np = inet6_sk(sk);
456b61bc
ED		 251 struct ipv6_mc_socklist *mc_lst;
252 struct ipv6_mc_socklist __rcu **lnk;
3b1e0a65 253 struct net *net = sock_net(sk);
1da177e4 254
46a4dee0
MC		 255 ASSERT_RTNL();
256
a858d64b
LW		 257 if (!ipv6_addr_is_multicast(addr))
258 return -EINVAL;
259
456b61bc 260 for (lnk = &np->ipv6_mc_list;
4b4b8446 261 (mc_lst = sock_dereference(*lnk, sk)) != NULL;
456b61bc 262 lnk = &mc_lst->next) {
1da177e4
LT		 263 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
264 ipv6_addr_equal(&mc_lst->addr, addr)) {
265 struct net_device *dev;
266
267 *lnk = mc_lst->next;
1da177e4 268
414b6c94 269 dev = __dev_get_by_index(net, mc_lst->ifindex);
53b24b8f 270 if (dev) {
96b52e61 271 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 272
63ed8de4 273 ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 274 if (idev)
1da177e4 275 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
63ed8de4
TY		 276 } else {
277 ip6_mc_leave_src(sk, mc_lst, NULL);
278 }
a9ed4a29 279
456b61bc 280 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 281 kfree_rcu(mc_lst, rcu);
1da177e4
LT		 282 return 0;
283 }
284 }
1da177e4 285
9951f036 286 return -EADDRNOTAVAIL;
1da177e4 287}
46a4dee0 288EXPORT_SYMBOL(ipv6_sock_mc_drop);
1da177e4 289
88e2ca30
TY		 290static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net,
291 const struct in6_addr *group,
292 int ifindex)
1da177e4
LT		 293{
294 struct net_device *dev = NULL;
295 struct inet6_dev *idev = NULL;
296
297 if (ifindex == 0) {
b75cc8f9 298 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
1da177e4 299
1da177e4 300 if (rt) {
d1918542 301 dev = rt->dst.dev;
94e187c0 302 ip6_rt_put(rt);
1da177e4 303 }
88e2ca30
TY		 304 } else {
305 dev = __dev_get_by_index(net, ifindex);
306 }
1da177e4
LT		 307
308 if (!dev)
96b52e61
ED		 309 return NULL;
310 idev = __in6_dev_get(dev);
448eb71f 311 if (!idev)
8a22c99a 312 return NULL;
88e2ca30 313 if (idev->dead)
96b52e61 314 return NULL;
1da177e4
LT		 315 return idev;
316}
317
8651be8f 318void __ipv6_sock_mc_close(struct sock *sk)
1da177e4
LT		 319{
320 struct ipv6_pinfo *np = inet6_sk(sk);
321 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 322 struct net *net = sock_net(sk);
1da177e4 323
8651be8f 324 ASSERT_RTNL();
0e1efe9d 325
4b4b8446 326 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) {
1da177e4
LT		 327 struct net_device *dev;
328
329 np->ipv6_mc_list = mc_lst->next;
1da177e4 330
414b6c94 331 dev = __dev_get_by_index(net, mc_lst->ifindex);
1da177e4 332 if (dev) {
96b52e61 333 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 334
63ed8de4 335 ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 336 if (idev)
1da177e4 337 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
63ed8de4
TY		 338 } else {
339 ip6_mc_leave_src(sk, mc_lst, NULL);
340 }
1da177e4 341
456b61bc 342 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 343 kfree_rcu(mc_lst, rcu);
1da177e4 344 }
8651be8f
WC		 345}
346
347void ipv6_sock_mc_close(struct sock *sk)
348{
349 struct ipv6_pinfo *np = inet6_sk(sk);
350
351 if (!rcu_access_pointer(np->ipv6_mc_list))
352 return;
4b4b8446 353
8651be8f 354 rtnl_lock();
4b4b8446 355 lock_sock(sk);
8651be8f 356 __ipv6_sock_mc_close(sk);
4b4b8446 357 release_sock(sk);
a9ed4a29 358 rtnl_unlock();
1da177e4
LT		 359}
360
361int ip6_mc_source(int add, int omode, struct sock *sk,
362 struct group_source_req *pgsr)
363{
364 struct in6_addr *source, *group;
365 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 366 struct inet6_dev *idev;
367 struct ipv6_pinfo *inet6 = inet6_sk(sk);
368 struct ip6_sf_socklist *psl;
3b1e0a65 369 struct net *net = sock_net(sk);
1da177e4 370 int i, j, rv;
c9e3e8b6 371 int leavegroup = 0;
1da177e4
LT		 372 int err;
373
1da177e4
LT		 374 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
375 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
376
377 if (!ipv6_addr_is_multicast(group))
378 return -EINVAL;
379
88e2ca30
TY		 380 idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface);
381 if (!idev)
1da177e4 382 return -ENODEV;
1da177e4
LT		 383
384 err = -EADDRNOTAVAIL;
385
63ed8de4 386 mutex_lock(&idev->mc_lock);
4b4b8446 387 for_each_pmc_socklock(inet6, sk, pmc) {
1da177e4
LT		 388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
389 continue;
390 if (ipv6_addr_equal(&pmc->addr, group))
391 break;
392 }
917f2f10
DS		 393 if (!pmc) { /* must have a prior join */
394 err = -EINVAL;
1da177e4 395 goto done;
917f2f10 396 }
1da177e4 397 /* if a source filter was set, must be the same mode as before */
882ba1f7 398 if (rcu_access_pointer(pmc->sflist)) {
917f2f10
DS		 399 if (pmc->sfmode != omode) {
400 err = -EINVAL;
1da177e4 401 goto done;
917f2f10 402 }
1da177e4
LT		 403 } else if (pmc->sfmode != omode) {
404 /* allow mode switches for empty-set filters */
405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
407 pmc->sfmode = omode;
408 }
409
4b4b8446 410 psl = sock_dereference(pmc->sflist, sk);
1da177e4
LT		 411 if (!add) {
412 if (!psl)
917f2f10 413 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 414 rv = !0;
67ba4152 415 for (i = 0; i < psl->sl_count; i++) {
07c2fecc 416 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
1da177e4
LT		 417 if (rv == 0)
418 break;
419 }
420 if (rv) /* source not found */
917f2f10 421 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 422
c9e3e8b6
DS		 423 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
424 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
425 leavegroup = 1;
426 goto done;
427 }
428
1da177e4
LT		 429 /* update the interface filter */
430 ip6_mc_del_src(idev, group, omode, 1, source, 1);
431
67ba4152 432 for (j = i+1; j < psl->sl_count; j++)
1da177e4
LT		 433 psl->sl_addr[j-1] = psl->sl_addr[j];
434 psl->sl_count--;
435 err = 0;
436 goto done;
437 }
438 /* else, add a new source to the filter */
439
440 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
441 err = -ENOBUFS;
442 goto done;
443 }
444 if (!psl || psl->sl_count == psl->sl_max) {
445 struct ip6_sf_socklist *newpsl;
446 int count = IP6_SFBLOCK;
447
448 if (psl)
449 count += psl->sl_max;
e11c0e25
GS		 450 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count),
451 GFP_KERNEL);
1da177e4
LT		 452 if (!newpsl) {
453 err = -ENOBUFS;
454 goto done;
455 }
456 newpsl->sl_max = count;
457 newpsl->sl_count = count - IP6_SFBLOCK;
458 if (psl) {
67ba4152 459 for (i = 0; i < psl->sl_count; i++)
1da177e4 460 newpsl->sl_addr[i] = psl->sl_addr[i];
e11c0e25
GS		 461 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
462 &sk->sk_omem_alloc);
1da177e4 463 }
a9384a4c
ED		 464 rcu_assign_pointer(pmc->sflist, newpsl);
465 kfree_rcu(psl, rcu);
882ba1f7 466 psl = newpsl;
1da177e4
LT		 467 }
468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
67ba4152 469 for (i = 0; i < psl->sl_count; i++) {
07c2fecc 470 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
56db1c5f
JS		 471 if (rv == 0) /* There is an error in the address. */
472 goto done;
1da177e4 473 }
67ba4152 474 for (j = psl->sl_count-1; j >= i; j--)
1da177e4
LT		 475 psl->sl_addr[j+1] = psl->sl_addr[j];
476 psl->sl_addr[i] = *source;
477 psl->sl_count++;
478 err = 0;
479 /* update the interface list */
480 ip6_mc_add_src(idev, group, omode, 1, source, 1);
481done:
63ed8de4 482 mutex_unlock(&idev->mc_lock);
c9e3e8b6 483 if (leavegroup)
54ff9ef3 484 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 485 return err;
486}
487
d59eb177
AV		 488int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
489 struct sockaddr_storage *list)
1da177e4 490{
b71d1d42 491 const struct in6_addr *group;
1da177e4 492 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 493 struct inet6_dev *idev;
494 struct ipv6_pinfo *inet6 = inet6_sk(sk);
495 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 496 struct net *net = sock_net(sk);
9951f036 497 int leavegroup = 0;
1da177e4
LT		 498 int i, err;
499
500 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
501
502 if (!ipv6_addr_is_multicast(group))
503 return -EINVAL;
504 if (gsf->gf_fmode != MCAST_INCLUDE &&
505 gsf->gf_fmode != MCAST_EXCLUDE)
506 return -EINVAL;
507
88e2ca30
TY		 508 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface);
509 if (!idev)
1da177e4 510 return -ENODEV;
1da177e4 511
9c05989b 512 err = 0;
5ab4a6c8 513
9951f036
DS		 514 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
515 leavegroup = 1;
516 goto done;
517 }
518
4b4b8446 519 for_each_pmc_socklock(inet6, sk, pmc) {
1da177e4
LT		 520 if (pmc->ifindex != gsf->gf_interface)
521 continue;
522 if (ipv6_addr_equal(&pmc->addr, group))
523 break;
524 }
917f2f10
DS		 525 if (!pmc) { /* must have a prior join */
526 err = -EINVAL;
1da177e4 527 goto done;
917f2f10 528 }
1da177e4 529 if (gsf->gf_numsrc) {
e11c0e25
GS		 530 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr,
531 gsf->gf_numsrc),
532 GFP_KERNEL);
1da177e4
LT		 533 if (!newpsl) {
534 err = -ENOBUFS;
535 goto done;
536 }
537 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
d59eb177 538 for (i = 0; i < newpsl->sl_count; ++i, ++list) {
1da177e4
LT		 539 struct sockaddr_in6 *psin6;
540
d59eb177 541 psin6 = (struct sockaddr_in6 *)list;
1da177e4
LT		 542 newpsl->sl_addr[i] = psin6->sin6_addr;
543 }
63ed8de4 544 mutex_lock(&idev->mc_lock);
1da177e4 545 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
63ed8de4 546 newpsl->sl_count, newpsl->sl_addr, 0);
1da177e4 547 if (err) {
63ed8de4 548 mutex_unlock(&idev->mc_lock);
e11c0e25
GS		 549 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr,
550 newpsl->sl_max));
1da177e4
LT		 551 goto done;
552 }
63ed8de4 553 mutex_unlock(&idev->mc_lock);
8713dbf0 554 } else {
1da177e4 555 newpsl = NULL;
63ed8de4
TY		 556 mutex_lock(&idev->mc_lock);
557 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
558 mutex_unlock(&idev->mc_lock);
8713dbf0 559 }
5ab4a6c8 560
63ed8de4 561 mutex_lock(&idev->mc_lock);
4b4b8446 562 psl = sock_dereference(pmc->sflist, sk);
1da177e4 563 if (psl) {
63ed8de4
TY		 564 ip6_mc_del_src(idev, group, pmc->sfmode,
565 psl->sl_count, psl->sl_addr, 0);
e11c0e25
GS		 566 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
567 &sk->sk_omem_alloc);
63ed8de4
TY		 568 } else {
569 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
570 }
882ba1f7 571 rcu_assign_pointer(pmc->sflist, newpsl);
a9384a4c
ED		 572 mutex_unlock(&idev->mc_lock);
573 kfree_rcu(psl, rcu);
1da177e4 574 pmc->sfmode = gsf->gf_fmode;
917f2f10 575 err = 0;
1da177e4 576done:
9951f036
DS		 577 if (leavegroup)
578 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 579 return err;
580}
581
582int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
6dadbe4b 583 sockptr_t optval, size_t ss_offset)
1da177e4 584{
4b4b8446 585 struct ipv6_pinfo *inet6 = inet6_sk(sk);
b71d1d42 586 const struct in6_addr *group;
1da177e4 587 struct ipv6_mc_socklist *pmc;
1da177e4 588 struct ip6_sf_socklist *psl;
4b4b8446 589 int i, count, copycount;
1da177e4
LT		 590
591 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
592
593 if (!ipv6_addr_is_multicast(group))
594 return -EINVAL;
595
f7ed925c 596 /* changes to the ipv6_mc_list require the socket lock and
4b4b8446 597 * rtnl lock. We have the socket lock, so reading the list is safe.
5ab4a6c8 598 */
1da177e4 599
4b4b8446 600 for_each_pmc_socklock(inet6, sk, pmc) {
1da177e4
LT		 601 if (pmc->ifindex != gsf->gf_interface)
602 continue;
603 if (ipv6_addr_equal(group, &pmc->addr))
604 break;
605 }
606 if (!pmc) /* must have a prior join */
4b4b8446 607 return -EADDRNOTAVAIL;
88e2ca30 608
1da177e4 609 gsf->gf_fmode = pmc->sfmode;
4b4b8446 610 psl = sock_dereference(pmc->sflist, sk);
1da177e4 611 count = psl ? psl->sl_count : 0;
1da177e4
LT		 612
613 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
614 gsf->gf_numsrc = count;
6dadbe4b 615 for (i = 0; i < copycount; i++) {
1da177e4
LT		 616 struct sockaddr_in6 *psin6;
617 struct sockaddr_storage ss;
618
619 psin6 = (struct sockaddr_in6 *)&ss;
620 memset(&ss, 0, sizeof(ss));
621 psin6->sin6_family = AF_INET6;
622 psin6->sin6_addr = psl->sl_addr[i];
6dadbe4b 623 if (copy_to_sockptr_offset(optval, ss_offset, &ss, sizeof(ss)))
1da177e4 624 return -EFAULT;
6dadbe4b 625 ss_offset += sizeof(ss);
1da177e4
LT		 626 }
627 return 0;
1da177e4
LT		 628}
629
66eb554c 630bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr,
a50feda5 631 const struct in6_addr *src_addr)
1da177e4 632{
66eb554c
ED		 633 const struct ipv6_pinfo *np = inet6_sk(sk);
634 const struct ipv6_mc_socklist *mc;
635 const struct ip6_sf_socklist *psl;
a50feda5 636 bool rv = true;
1da177e4 637
456b61bc
ED		 638 rcu_read_lock();
639 for_each_pmc_rcu(np, mc) {
1da177e4
LT		 640 if (ipv6_addr_equal(&mc->addr, mc_addr))
641 break;
642 }
643 if (!mc) {
456b61bc 644 rcu_read_unlock();
15033f04 645 return np->mc_all;
1da177e4 646 }
882ba1f7 647 psl = rcu_dereference(mc->sflist);
1da177e4
LT		 648 if (!psl) {
649 rv = mc->sfmode == MCAST_EXCLUDE;
650 } else {
651 int i;
652
67ba4152 653 for (i = 0; i < psl->sl_count; i++) {
1da177e4
LT		 654 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
655 break;
656 }
657 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
a50feda5 658 rv = false;
1da177e4 659 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
a50feda5 660 rv = false;
1da177e4 661 }
456b61bc 662 rcu_read_unlock();
1da177e4
LT		 663
664 return rv;
665}
666
63ed8de4 667/* called with mc_lock */
0ae0d60a 668static void igmp6_group_added(struct ifmcaddr6 *mc)
1da177e4
LT		 669{
670 struct net_device *dev = mc->idev->dev;
671 char buf[MAX_ADDR_LEN];
672
ec16ef22
YH		 673 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
674 IPV6_ADDR_SCOPE_LINKLOCAL)
675 return;
676
1da177e4
LT		 677 if (!(mc->mca_flags&MAF_LOADED)) {
678 mc->mca_flags |= MAF_LOADED;
679 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 680 dev_mc_add(dev, buf);
1da177e4 681 }
1da177e4
LT		 682
683 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
684 return;
685
6c567b78 686 if (mld_in_v1_mode(mc->idev)) {
1da177e4
LT		 687 igmp6_join_group(mc);
688 return;
689 }
690 /* else v2 */
691
c7ea20c9
HL		 692 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
693 * should not send filter-mode change record as the mode
694 * should be from IN() to IN(A).
695 */
0ae0d60a 696 if (mc->mca_sfmode == MCAST_EXCLUDE)
c7ea20c9
HL		 697 mc->mca_crcount = mc->idev->mc_qrv;
698
1da177e4
LT		 699 mld_ifc_event(mc->idev);
700}
701
63ed8de4 702/* called with mc_lock */
1da177e4
LT		 703static void igmp6_group_dropped(struct ifmcaddr6 *mc)
704{
705 struct net_device *dev = mc->idev->dev;
706 char buf[MAX_ADDR_LEN];
707
ec16ef22
YH		 708 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
709 IPV6_ADDR_SCOPE_LINKLOCAL)
710 return;
711
1da177e4
LT		 712 if (mc->mca_flags&MAF_LOADED) {
713 mc->mca_flags &= ~MAF_LOADED;
714 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 715 dev_mc_del(dev, buf);
1da177e4
LT		 716 }
717
1666d49e
HL		 718 if (mc->mca_flags & MAF_NOREPORT)
719 return;
1da177e4
LT		 720
721 if (!mc->idev->dead)
722 igmp6_leave_group(mc);
723
2d9a93b4 724 if (cancel_delayed_work(&mc->mca_work))
d3981bc6 725 refcount_dec(&mc->mca_refcnt);
1da177e4
LT		 726}
727
728/*
729 * deleted ifmcaddr6 manipulation
63ed8de4 730 * called with mc_lock
1da177e4
LT		 731 */
732static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
733{
734 struct ifmcaddr6 *pmc;
735
736 /* this is an "ifmcaddr6" for convenience; only the fields below
737 * are actually used. In particular, the refcnt and users are not
738 * used for management of the delete list. Using the same structure
739 * for deleted items allows change reports to use common code with
740 * non-deleted or query-response MCA's.
741 */
f185de28 742 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 743 if (!pmc)
744 return;
0c600eda 745
1da177e4
LT		 746 pmc->idev = im->idev;
747 in6_dev_hold(idev);
748 pmc->mca_addr = im->mca_addr;
749 pmc->mca_crcount = idev->mc_qrv;
750 pmc->mca_sfmode = im->mca_sfmode;
751 if (pmc->mca_sfmode == MCAST_INCLUDE) {
752 struct ip6_sf_list *psf;
753
4b200e39 754 rcu_assign_pointer(pmc->mca_tomb,
63ed8de4 755 mc_dereference(im->mca_tomb, idev));
4b200e39 756 rcu_assign_pointer(pmc->mca_sources,
63ed8de4 757 mc_dereference(im->mca_sources, idev));
4b200e39
TY		 758 RCU_INIT_POINTER(im->mca_tomb, NULL);
759 RCU_INIT_POINTER(im->mca_sources, NULL);
760
63ed8de4 761 for_each_psf_mclock(pmc, psf)
1da177e4
LT		 762 psf->sf_crcount = pmc->mca_crcount;
763 }
1da177e4 764
88e2ca30
TY		 765 rcu_assign_pointer(pmc->next, idev->mc_tomb);
766 rcu_assign_pointer(idev->mc_tomb, pmc);
1da177e4
LT		 767}
768
63ed8de4 769/* called with mc_lock */
1666d49e 770static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
1da177e4 771{
4b200e39 772 struct ip6_sf_list *psf, *sources, *tomb;
1666d49e 773 struct in6_addr *pmca = &im->mca_addr;
4b200e39 774 struct ifmcaddr6 *pmc, *pmc_prev;
1da177e4 775
1da177e4 776 pmc_prev = NULL;
88e2ca30 777 for_each_mc_tomb(idev, pmc) {
1da177e4
LT		 778 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
779 break;
780 pmc_prev = pmc;
781 }
782 if (pmc) {
783 if (pmc_prev)
88e2ca30 784 rcu_assign_pointer(pmc_prev->next, pmc->next);
1da177e4 785 else
88e2ca30 786 rcu_assign_pointer(idev->mc_tomb, pmc->next);
1da177e4 787 }
6457d26b 788
1da177e4 789 if (pmc) {
1666d49e 790 im->idev = pmc->idev;
08d3ffcc 791 if (im->mca_sfmode == MCAST_INCLUDE) {
4b200e39 792 tomb = rcu_replace_pointer(im->mca_tomb,
63ed8de4
TY		 793 mc_dereference(pmc->mca_tomb, pmc->idev),
794 lockdep_is_held(&im->idev->mc_lock));
4b200e39
TY		 795 rcu_assign_pointer(pmc->mca_tomb, tomb);
796
797 sources = rcu_replace_pointer(im->mca_sources,
63ed8de4
TY		 798 mc_dereference(pmc->mca_sources, pmc->idev),
799 lockdep_is_held(&im->idev->mc_lock));
4b200e39 800 rcu_assign_pointer(pmc->mca_sources, sources);
63ed8de4 801 for_each_psf_mclock(im, psf)
c7ea20c9
HL		 802 psf->sf_crcount = idev->mc_qrv;
803 } else {
804 im->mca_crcount = idev->mc_qrv;
1da177e4
LT		 805 }
806 in6_dev_put(pmc->idev);
a84d0164 807 ip6_mc_clear_src(pmc);
88e2ca30 808 kfree_rcu(pmc, rcu);
1da177e4
LT		 809 }
810}
811
63ed8de4 812/* called with mc_lock */
1da177e4
LT		 813static void mld_clear_delrec(struct inet6_dev *idev)
814{
815 struct ifmcaddr6 *pmc, *nextpmc;
816
63ed8de4 817 pmc = mc_dereference(idev->mc_tomb, idev);
88e2ca30 818 RCU_INIT_POINTER(idev->mc_tomb, NULL);
1da177e4
LT		 819
820 for (; pmc; pmc = nextpmc) {
63ed8de4 821 nextpmc = mc_dereference(pmc->next, idev);
1da177e4
LT		 822 ip6_mc_clear_src(pmc);
823 in6_dev_put(pmc->idev);
88e2ca30 824 kfree_rcu(pmc, rcu);
1da177e4
LT		 825 }
826
827 /* clear dead sources, too */
63ed8de4 828 for_each_mc_mclock(idev, pmc) {
1da177e4
LT		 829 struct ip6_sf_list *psf, *psf_next;
830
63ed8de4 831 psf = mc_dereference(pmc->mca_tomb, idev);
4b200e39 832 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
67ba4152 833 for (; psf; psf = psf_next) {
63ed8de4 834 psf_next = mc_dereference(psf->sf_next, idev);
4b200e39 835 kfree_rcu(psf, rcu);
1da177e4
LT		 836 }
837 }
1da177e4
LT		 838}
839
f185de28
TY		 840static void mld_clear_query(struct inet6_dev *idev)
841{
842 struct sk_buff *skb;
843
844 spin_lock_bh(&idev->mc_query_lock);
845 while ((skb = __skb_dequeue(&idev->mc_query_queue)))
846 kfree_skb(skb);
847 spin_unlock_bh(&idev->mc_query_lock);
848}
849
850static void mld_clear_report(struct inet6_dev *idev)
851{
852 struct sk_buff *skb;
853
854 spin_lock_bh(&idev->mc_report_lock);
855 while ((skb = __skb_dequeue(&idev->mc_report_queue)))
856 kfree_skb(skb);
857 spin_unlock_bh(&idev->mc_report_lock);
858}
859
1691c63e
WC		 860static void mca_get(struct ifmcaddr6 *mc)
861{
d3981bc6 862 refcount_inc(&mc->mca_refcnt);
1691c63e
WC		 863}
864
865static void ma_put(struct ifmcaddr6 *mc)
866{
d3981bc6 867 if (refcount_dec_and_test(&mc->mca_refcnt)) {
1691c63e 868 in6_dev_put(mc->idev);
88e2ca30 869 kfree_rcu(mc, rcu);
1691c63e
WC		 870 }
871}
872
63ed8de4 873/* called with mc_lock */
1691c63e 874static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
c7ea20c9
HL		 875 const struct in6_addr *addr,
876 unsigned int mode)
1691c63e
WC		 877{
878 struct ifmcaddr6 *mc;
879
f185de28 880 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
63159f29 881 if (!mc)
1691c63e
WC		 882 return NULL;
883
2d9a93b4 884 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work);
1691c63e
WC		 885
886 mc->mca_addr = *addr;
887 mc->idev = idev; /* reference taken by caller */
888 mc->mca_users = 1;
889 /* mca_stamp should be updated upon changes */
890 mc->mca_cstamp = mc->mca_tstamp = jiffies;
d3981bc6 891 refcount_set(&mc->mca_refcnt, 1);
1691c63e 892
c7ea20c9
HL		 893 mc->mca_sfmode = mode;
894 mc->mca_sfcount[mode] = 1;
1691c63e
WC		 895
896 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
897 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
898 mc->mca_flags |= MAF_NOREPORT;
899
900 return mc;
901}
1da177e4
LT		 902
903/*
904 * device multicast group inc (add if not found)
905 */
c7ea20c9
HL		 906static int __ipv6_dev_mc_inc(struct net_device *dev,
907 const struct in6_addr *addr, unsigned int mode)
1da177e4
LT		 908{
909 struct ifmcaddr6 *mc;
910 struct inet6_dev *idev;
911
a9ed4a29
SD		 912 ASSERT_RTNL();
913
96b52e61 914 /* we need to take a reference on idev */
1da177e4
LT		 915 idev = in6_dev_get(dev);
916
63159f29 917 if (!idev)
1da177e4
LT		 918 return -EINVAL;
919
1da177e4 920 if (idev->dead) {
1da177e4
LT		 921 in6_dev_put(idev);
922 return -ENODEV;
923 }
924
63ed8de4
TY		 925 mutex_lock(&idev->mc_lock);
926 for_each_mc_mclock(idev, mc) {
1da177e4
LT		 927 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
928 mc->mca_users++;
c7ea20c9 929 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
63ed8de4 930 mutex_unlock(&idev->mc_lock);
1da177e4
LT		 931 in6_dev_put(idev);
932 return 0;
933 }
934 }
935
c7ea20c9 936 mc = mca_alloc(idev, addr, mode);
1691c63e 937 if (!mc) {
63ed8de4 938 mutex_unlock(&idev->mc_lock);
1da177e4
LT		 939 in6_dev_put(idev);
940 return -ENOMEM;
941 }
942
88e2ca30
TY		 943 rcu_assign_pointer(mc->next, idev->mc_list);
944 rcu_assign_pointer(idev->mc_list, mc);
1691c63e 945
1691c63e 946 mca_get(mc);
1da177e4 947
1666d49e 948 mld_del_delrec(idev, mc);
0ae0d60a 949 igmp6_group_added(mc);
63ed8de4 950 mutex_unlock(&idev->mc_lock);
1da177e4
LT		 951 ma_put(mc);
952 return 0;
953}
954
c7ea20c9
HL		 955int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
956{
957 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
958}
4effd28c 959EXPORT_SYMBOL(ipv6_dev_mc_inc);
c7ea20c9 960
1da177e4 961/*
63ed8de4 962 * device multicast group del
1da177e4 963 */
9acd9f3a 964int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 965{
88e2ca30 966 struct ifmcaddr6 *ma, __rcu **map;
1da177e4 967
a9ed4a29
SD		 968 ASSERT_RTNL();
969
63ed8de4 970 mutex_lock(&idev->mc_lock);
88e2ca30 971 for (map = &idev->mc_list;
63ed8de4 972 (ma = mc_dereference(*map, idev));
88e2ca30 973 map = &ma->next) {
1da177e4
LT		 974 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
975 if (--ma->mca_users == 0) {
976 *map = ma->next;
1da177e4
LT		 977
978 igmp6_group_dropped(ma);
1666d49e 979 ip6_mc_clear_src(ma);
63ed8de4 980 mutex_unlock(&idev->mc_lock);
1da177e4
LT		 981
982 ma_put(ma);
983 return 0;
984 }
63ed8de4 985 mutex_unlock(&idev->mc_lock);
1da177e4
LT		 986 return 0;
987 }
988 }
1da177e4 989
63ed8de4 990 mutex_unlock(&idev->mc_lock);
1da177e4
LT		 991 return -ENOENT;
992}
993
9acd9f3a 994int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4 995{
96b52e61 996 struct inet6_dev *idev;
1da177e4
LT		 997 int err;
998
414b6c94 999 ASSERT_RTNL();
1da177e4 1000
96b52e61
ED		 1001 idev = __in6_dev_get(dev);
1002 if (!idev)
1003 err = -ENODEV;
1004 else
1005 err = __ipv6_dev_mc_dec(idev, addr);
1da177e4
LT		 1006
1007 return err;
1008}
4effd28c 1009EXPORT_SYMBOL(ipv6_dev_mc_dec);
1da177e4 1010
1da177e4
LT		 1011/*
1012 * check if the interface/address pair is valid
1013 */
a50feda5
ED		 1014bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1015 const struct in6_addr *src_addr)
1da177e4
LT		 1016{
1017 struct inet6_dev *idev;
1018 struct ifmcaddr6 *mc;
a50feda5 1019 bool rv = false;
1da177e4 1020
96b52e61
ED		 1021 rcu_read_lock();
1022 idev = __in6_dev_get(dev);
1da177e4 1023 if (idev) {
88e2ca30 1024 for_each_mc_rcu(idev, mc) {
1da177e4
LT		 1025 if (ipv6_addr_equal(&mc->mca_addr, group))
1026 break;
1027 }
1028 if (mc) {
1029 if (src_addr && !ipv6_addr_any(src_addr)) {
1030 struct ip6_sf_list *psf;
1031
4b200e39 1032 for_each_psf_rcu(mc, psf) {
1da177e4
LT		 1033 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1034 break;
1035 }
1036 if (psf)
1037 rv = psf->sf_count[MCAST_INCLUDE] ||
1038 psf->sf_count[MCAST_EXCLUDE] !=
1039 mc->mca_sfcount[MCAST_EXCLUDE];
1040 else
67ba4152 1041 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1da177e4 1042 } else
a50feda5 1043 rv = true; /* don't filter unspecified source */
1da177e4 1044 }
1da177e4 1045 }
96b52e61 1046 rcu_read_unlock();
1da177e4
LT		 1047 return rv;
1048}
1049
63ed8de4 1050/* called with mc_lock */
2d9a93b4 1051static void mld_gq_start_work(struct inet6_dev *idev)
1da177e4 1052{
8032bf12 1053 unsigned long tv = get_random_u32_below(idev->mc_maxdelay);
1da177e4
LT		 1054
1055 idev->mc_gq_running = 1;
2d9a93b4 1056 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
1da177e4
LT		 1057 in6_dev_hold(idev);
1058}
1059
63ed8de4 1060/* called with mc_lock */
2d9a93b4 1061static void mld_gq_stop_work(struct inet6_dev *idev)
b4af8def
DB		 1062{
1063 idev->mc_gq_running = 0;
2d9a93b4 1064 if (cancel_delayed_work(&idev->mc_gq_work))
b4af8def
DB		 1065 __in6_dev_put(idev);
1066}
1067
63ed8de4 1068/* called with mc_lock */
2d9a93b4 1069static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
1da177e4 1070{
8032bf12 1071 unsigned long tv = get_random_u32_below(delay);
1da177e4 1072
2d9a93b4 1073 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
1da177e4
LT		 1074 in6_dev_hold(idev);
1075}
1076
63ed8de4 1077/* called with mc_lock */
2d9a93b4 1078static void mld_ifc_stop_work(struct inet6_dev *idev)
b4af8def
DB		 1079{
1080 idev->mc_ifc_count = 0;
2d9a93b4 1081 if (cancel_delayed_work(&idev->mc_ifc_work))
b4af8def
DB		 1082 __in6_dev_put(idev);
1083}
1084
63ed8de4 1085/* called with mc_lock */
2d9a93b4 1086static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
b173ee48 1087{
8032bf12 1088 unsigned long tv = get_random_u32_below(delay);
b173ee48 1089
2d9a93b4 1090 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
b173ee48
HFS		 1091 in6_dev_hold(idev);
1092}
1093
2d9a93b4 1094static void mld_dad_stop_work(struct inet6_dev *idev)
b4af8def 1095{
2d9a93b4 1096 if (cancel_delayed_work(&idev->mc_dad_work))
b4af8def
DB		 1097 __in6_dev_put(idev);
1098}
1099
f185de28
TY		 1100static void mld_query_stop_work(struct inet6_dev *idev)
1101{
1102 spin_lock_bh(&idev->mc_query_lock);
1103 if (cancel_delayed_work(&idev->mc_query_work))
1104 __in6_dev_put(idev);
1105 spin_unlock_bh(&idev->mc_query_lock);
1106}
1107
1108static void mld_report_stop_work(struct inet6_dev *idev)
1109{
1110 if (cancel_delayed_work_sync(&idev->mc_report_work))
1111 __in6_dev_put(idev);
1112}
1113
1da177e4 1114/*
88e2ca30 1115 * IGMP handling (alias multicast ICMPv6 messages)
63ed8de4 1116 * called with mc_lock
1da177e4 1117 */
1da177e4
LT		 1118static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1119{
1120 unsigned long delay = resptime;
1121
2d9a93b4 1122 /* Do not start work for these addresses */
1da177e4
LT		 1123 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1124 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1125 return;
1126
2d9a93b4 1127 if (cancel_delayed_work(&ma->mca_work)) {
d3981bc6 1128 refcount_dec(&ma->mca_refcnt);
2d9a93b4 1129 delay = ma->mca_work.timer.expires - jiffies;
1da177e4
LT		 1130 }
1131
cc7f7ab7 1132 if (delay >= resptime)
8032bf12 1133 delay = get_random_u32_below(resptime);
cc7f7ab7 1134
2d9a93b4 1135 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
d3981bc6 1136 refcount_inc(&ma->mca_refcnt);
1da177e4
LT		 1137 ma->mca_flags |= MAF_TIMER_RUNNING;
1138}
1139
63ed8de4
TY		 1140/* mark EXCLUDE-mode sources
1141 * called with mc_lock
1142 */
a50feda5
ED		 1143static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1144 const struct in6_addr *srcs)
1da177e4
LT		 1145{
1146 struct ip6_sf_list *psf;
1147 int i, scount;
1148
1149 scount = 0;
63ed8de4 1150 for_each_psf_mclock(pmc, psf) {
1da177e4
LT		 1151 if (scount == nsrcs)
1152 break;
67ba4152 1153 for (i = 0; i < nsrcs; i++) {
5ab4a6c8 1154 /* skip inactive filters */
e05c4ad3 1155 if (psf->sf_count[MCAST_INCLUDE] ||
5ab4a6c8
DS		 1156 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1157 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 1158 break;
5ab4a6c8
DS		 1159 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1160 scount++;
1161 break;
1162 }
1163 }
1164 }
1165 pmc->mca_flags &= ~MAF_GSQUERY;
1166 if (scount == nsrcs) /* all sources excluded */
a50feda5
ED		 1167 return false;
1168 return true;
5ab4a6c8
DS		 1169}
1170
63ed8de4 1171/* called with mc_lock */
a50feda5
ED		 1172static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1173 const struct in6_addr *srcs)
5ab4a6c8
DS		 1174{
1175 struct ip6_sf_list *psf;
1176 int i, scount;
1177
1178 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1179 return mld_xmarksources(pmc, nsrcs, srcs);
1180
1181 /* mark INCLUDE-mode sources */
1182
1183 scount = 0;
63ed8de4 1184 for_each_psf_mclock(pmc, psf) {
5ab4a6c8
DS		 1185 if (scount == nsrcs)
1186 break;
67ba4152 1187 for (i = 0; i < nsrcs; i++) {
1da177e4
LT		 1188 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1189 psf->sf_gsresp = 1;
1190 scount++;
1191 break;
1192 }
5ab4a6c8
DS		 1193 }
1194 }
1195 if (!scount) {
1196 pmc->mca_flags &= ~MAF_GSQUERY;
a50feda5 1197 return false;
1da177e4 1198 }
5ab4a6c8 1199 pmc->mca_flags |= MAF_GSQUERY;
a50feda5 1200 return true;
1da177e4
LT		 1201}
1202
58c0ecfd
DB		 1203static int mld_force_mld_version(const struct inet6_dev *idev)
1204{
1205 /* Normally, both are 0 here. If enforcement to a particular is
1206 * being used, individual device enforcement will have a lower
1207 * precedence over 'all' device (.../conf/all/force_mld_version).
1208 */
1209
1210 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1211 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1212 else
1213 return idev->cnf.force_mld_version;
1214}
1215
1216static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1217{
1218 return mld_force_mld_version(idev) == 2;
1219}
1220
1221static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1222{
1223 return mld_force_mld_version(idev) == 1;
1224}
1225
6c567b78
DB		 1226static bool mld_in_v1_mode(const struct inet6_dev *idev)
1227{
58c0ecfd
DB		 1228 if (mld_in_v2_mode_only(idev))
1229 return false;
1230 if (mld_in_v1_mode_only(idev))
6c567b78
DB		 1231 return true;
1232 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1233 return true;
1234
1235 return false;
1236}
1237
89225d1c
DB		 1238static void mld_set_v1_mode(struct inet6_dev *idev)
1239{
1240 /* RFC3810, relevant sections:
1241 * - 9.1. Robustness Variable
1242 * - 9.2. Query Interval
1243 * - 9.3. Query Response Interval
1244 * - 9.12. Older Version Querier Present Timeout
1245 */
1246 unsigned long switchback;
1247
1248 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1249
1250 idev->mc_v1_seen = jiffies + switchback;
1251}
1252
1253static void mld_update_qrv(struct inet6_dev *idev,
1254 const struct mld2_query *mlh2)
1255{
1256 /* RFC3810, relevant sections:
1257 * - 5.1.8. QRV (Querier's Robustness Variable)
1258 * - 9.1. Robustness Variable
1259 */
1260
1261 /* The value of the Robustness Variable MUST NOT be zero,
1262 * and SHOULD NOT be one. Catch this here if we ever run
1263 * into such a case in future.
1264 */
2f711939 1265 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
89225d1c
DB		 1266 WARN_ON(idev->mc_qrv == 0);
1267
1268 if (mlh2->mld2q_qrv > 0)
1269 idev->mc_qrv = mlh2->mld2q_qrv;
1270
2f711939 1271 if (unlikely(idev->mc_qrv < min_qrv)) {
89225d1c 1272 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
2f711939
HFS		 1273 idev->mc_qrv, min_qrv);
1274 idev->mc_qrv = min_qrv;
89225d1c
DB		 1275 }
1276}
1277
1278static void mld_update_qi(struct inet6_dev *idev,
1279 const struct mld2_query *mlh2)
1280{
1281 /* RFC3810, relevant sections:
1282 * - 5.1.9. QQIC (Querier's Query Interval Code)
1283 * - 9.2. Query Interval
1284 * - 9.12. Older Version Querier Present Timeout
1285 * (the [Query Interval] in the last Query received)
1286 */
1287 unsigned long mc_qqi;
1288
1289 if (mlh2->mld2q_qqic < 128) {
1290 mc_qqi = mlh2->mld2q_qqic;
1291 } else {
1292 unsigned long mc_man, mc_exp;
1293
1294 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1295 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1296
1297 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1298 }
1299
1300 idev->mc_qi = mc_qqi * HZ;
1301}
1302
1303static void mld_update_qri(struct inet6_dev *idev,
1304 const struct mld2_query *mlh2)
1305{
1306 /* RFC3810, relevant sections:
1307 * - 5.1.3. Maximum Response Code
1308 * - 9.3. Query Response Interval
1309 */
e3f5b170 1310 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
89225d1c
DB		 1311}
1312
2b7c121f 1313static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
35f7aa53 1314 unsigned long *max_delay, bool v1_query)
2b7c121f
DB		 1315{
1316 unsigned long mldv1_md;
1317
1318 /* Ignore v1 queries */
1319 if (mld_in_v2_mode_only(idev))
1320 return -EINVAL;
1321
2b7c121f 1322 mldv1_md = ntohs(mld->mld_maxdelay);
35f7aa53
DB		 1323
1324 /* When in MLDv1 fallback and a MLDv2 router start-up being
1325 * unaware of current MLDv1 operation, the MRC == MRD mapping
1326 * only works when the exponential algorithm is not being
1327 * used (as MLDv1 is unaware of such things).
1328 *
1329 * According to the RFC author, the MLDv2 implementations
1330 * he's aware of all use a MRC < 32768 on start up queries.
1331 *
1332 * Thus, should we *ever* encounter something else larger
1333 * than that, just assume the maximum possible within our
1334 * reach.
1335 */
1336 if (!v1_query)
1337 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1338
2b7c121f
DB		 1339 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1340
35f7aa53
DB		 1341 /* MLDv1 router present: we need to go into v1 mode *only*
1342 * when an MLDv1 query is received as per section 9.12. of
1343 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1344 * queries MUST be of exactly 24 octets.
1345 */
1346 if (v1_query)
1347 mld_set_v1_mode(idev);
2b7c121f 1348
2d9a93b4
TY		 1349 /* cancel MLDv2 report work */
1350 mld_gq_stop_work(idev);
1351 /* cancel the interface change work */
1352 mld_ifc_stop_work(idev);
2b7c121f
DB		 1353 /* clear deleted report items */
1354 mld_clear_delrec(idev);
1355
1356 return 0;
1357}
1358
3f22bb13
JK		 1359static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1360 unsigned long *max_delay)
2b7c121f 1361{
2b7c121f
DB		 1362 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1363
1364 mld_update_qrv(idev, mld);
1365 mld_update_qi(idev, mld);
1366 mld_update_qri(idev, mld);
1367
1368 idev->mc_maxdelay = *max_delay;
1369
3f22bb13 1370 return;
2b7c121f
DB		 1371}
1372
96b52e61 1373/* called with rcu_read_lock() */
2d3916f3 1374void igmp6_event_query(struct sk_buff *skb)
f185de28
TY		 1375{
1376 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1377
2d3916f3
ED		 1378 if (!idev || idev->dead)
1379 goto out;
f185de28
TY		 1380
1381 spin_lock_bh(&idev->mc_query_lock);
1382 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) {
1383 __skb_queue_tail(&idev->mc_query_queue, skb);
1384 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0))
1385 in6_dev_hold(idev);
2d3916f3 1386 skb = NULL;
f185de28
TY		 1387 }
1388 spin_unlock_bh(&idev->mc_query_lock);
2d3916f3
ED		 1389out:
1390 kfree_skb(skb);
f185de28
TY		 1391}
1392
1393static void __mld_query_work(struct sk_buff *skb)
1da177e4 1394{
97300b5f 1395 struct mld2_query *mlh2 = NULL;
b71d1d42 1396 const struct in6_addr *group;
1da177e4
LT		 1397 unsigned long max_delay;
1398 struct inet6_dev *idev;
f185de28 1399 struct ifmcaddr6 *ma;
6e7cb837 1400 struct mld_msg *mld;
1da177e4
LT		 1401 int group_type;
1402 int mark = 0;
2b7c121f 1403 int len, err;
1da177e4
LT		 1404
1405 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
63ed8de4 1406 goto kfree_skb;
1da177e4
LT		 1407
1408 /* compute payload length excluding extension headers */
0660e03f 1409 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1410 len -= skb_network_header_len(skb);
1da177e4 1411
e940f5d6
HL		 1412 /* RFC3810 6.2
1413 * Upon reception of an MLD message that contains a Query, the node
1414 * checks if the source address of the message is a valid link-local
1415 * address, if the Hop Limit is set to 1, and if the Router Alert
1416 * option is present in the Hop-By-Hop Options header of the IPv6
1417 * packet. If any of these checks fails, the packet is dropped.
1418 */
1419 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1420 ipv6_hdr(skb)->hop_limit != 1 ||
1421 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1422 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
63ed8de4 1423 goto kfree_skb;
1da177e4 1424
63ed8de4 1425 idev = in6_dev_get(skb->dev);
63159f29 1426 if (!idev)
63ed8de4 1427 goto kfree_skb;
1da177e4 1428
6e7cb837
YH		 1429 mld = (struct mld_msg *)icmp6_hdr(skb);
1430 group = &mld->mld_mca;
1da177e4
LT		 1431 group_type = ipv6_addr_type(group);
1432
1433 if (group_type != IPV6_ADDR_ANY &&
96b52e61 1434 !(group_type&IPV6_ADDR_MULTICAST))
f185de28 1435 goto out;
1da177e4 1436
35f7aa53 1437 if (len < MLD_V1_QUERY_LEN) {
f185de28 1438 goto out;
35f7aa53
DB		 1439 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1440 err = mld_process_v1(idev, mld, &max_delay,
1441 len == MLD_V1_QUERY_LEN);
2b7c121f 1442 if (err < 0)
f185de28 1443 goto out;
9fd07841 1444 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1ab1457c 1445 int srcs_offset = sizeof(struct mld2_query) -
97300b5f 1446 sizeof(struct icmp6hdr);
89225d1c 1447
96b52e61 1448 if (!pskb_may_pull(skb, srcs_offset))
f185de28 1449 goto out;
96b52e61 1450
9c70220b 1451 mlh2 = (struct mld2_query *)skb_transport_header(skb);
84698963 1452
3f22bb13 1453 mld_process_v2(idev, mlh2, &max_delay);
89225d1c 1454
1da177e4 1455 if (group_type == IPV6_ADDR_ANY) { /* general query */
96b52e61 1456 if (mlh2->mld2q_nsrcs)
f185de28 1457 goto out; /* no sources allowed */
96b52e61 1458
2d9a93b4 1459 mld_gq_start_work(idev);
f185de28 1460 goto out;
1da177e4
LT		 1461 }
1462 /* mark sources to include, if group & source-specific */
6e7cb837 1463 if (mlh2->mld2q_nsrcs != 0) {
1ab1457c 1464 if (!pskb_may_pull(skb, srcs_offset +
96b52e61 1465 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
f185de28 1466 goto out;
96b52e61 1467
9c70220b 1468 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1469 mark = 1;
1470 }
35f7aa53 1471 } else {
f185de28 1472 goto out;
35f7aa53 1473 }
1da177e4 1474
1da177e4 1475 if (group_type == IPV6_ADDR_ANY) {
63ed8de4 1476 for_each_mc_mclock(idev, ma) {
1da177e4 1477 igmp6_group_queried(ma, max_delay);
1da177e4
LT		 1478 }
1479 } else {
63ed8de4 1480 for_each_mc_mclock(idev, ma) {
7add2a43 1481 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4 1482 continue;
1da177e4
LT		 1483 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1484 /* gsquery <- gsquery && mark */
1485 if (!mark)
1486 ma->mca_flags &= ~MAF_GSQUERY;
1487 } else {
1488 /* gsquery <- mark */
1489 if (mark)
1490 ma->mca_flags |= MAF_GSQUERY;
1491 else
1492 ma->mca_flags &= ~MAF_GSQUERY;
1493 }
5ab4a6c8 1494 if (!(ma->mca_flags & MAF_GSQUERY) ||
6e7cb837 1495 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
5ab4a6c8 1496 igmp6_group_queried(ma, max_delay);
7add2a43 1497 break;
1da177e4
LT		 1498 }
1499 }
1da177e4 1500
f185de28 1501out:
63ed8de4
TY		 1502 in6_dev_put(idev);
1503kfree_skb:
f185de28
TY		 1504 consume_skb(skb);
1505}
1506
1507static void mld_query_work(struct work_struct *work)
1508{
1509 struct inet6_dev *idev = container_of(to_delayed_work(work),
1510 struct inet6_dev,
1511 mc_query_work);
1512 struct sk_buff_head q;
1513 struct sk_buff *skb;
1514 bool rework = false;
1515 int cnt = 0;
1516
1517 skb_queue_head_init(&q);
1518
1519 spin_lock_bh(&idev->mc_query_lock);
1520 while ((skb = __skb_dequeue(&idev->mc_query_queue))) {
1521 __skb_queue_tail(&q, skb);
1522
1523 if (++cnt >= MLD_MAX_QUEUE) {
1524 rework = true;
f185de28
TY		 1525 break;
1526 }
1527 }
1528 spin_unlock_bh(&idev->mc_query_lock);
1529
63ed8de4 1530 mutex_lock(&idev->mc_lock);
f185de28
TY		 1531 while ((skb = __skb_dequeue(&q)))
1532 __mld_query_work(skb);
63ed8de4 1533 mutex_unlock(&idev->mc_lock);
f185de28 1534
3e7d18b9
TY		 1535 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0))
1536 return;
1537
1538 in6_dev_put(idev);
1da177e4
LT		 1539}
1540
96b52e61 1541/* called with rcu_read_lock() */
2d3916f3 1542void igmp6_event_report(struct sk_buff *skb)
f185de28
TY		 1543{
1544 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1545
2d3916f3
ED		 1546 if (!idev || idev->dead)
1547 goto out;
f185de28
TY		 1548
1549 spin_lock_bh(&idev->mc_report_lock);
1550 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) {
1551 __skb_queue_tail(&idev->mc_report_queue, skb);
1552 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0))
1553 in6_dev_hold(idev);
2d3916f3 1554 skb = NULL;
f185de28
TY		 1555 }
1556 spin_unlock_bh(&idev->mc_report_lock);
2d3916f3
ED		 1557out:
1558 kfree_skb(skb);
f185de28
TY		 1559}
1560
1561static void __mld_report_work(struct sk_buff *skb)
1da177e4 1562{
1da177e4 1563 struct inet6_dev *idev;
63ed8de4 1564 struct ifmcaddr6 *ma;
6e7cb837 1565 struct mld_msg *mld;
1da177e4
LT		 1566 int addr_type;
1567
1568 /* Our own report looped back. Ignore it. */
1569 if (skb->pkt_type == PACKET_LOOPBACK)
63ed8de4 1570 goto kfree_skb;
1da177e4 1571
24c69275
DS		 1572 /* send our report if the MC router may not have heard this report */
1573 if (skb->pkt_type != PACKET_MULTICAST &&
1574 skb->pkt_type != PACKET_BROADCAST)
63ed8de4 1575 goto kfree_skb;
24c69275 1576
6e7cb837 1577 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
63ed8de4 1578 goto kfree_skb;
1da177e4 1579
6e7cb837 1580 mld = (struct mld_msg *)icmp6_hdr(skb);
1da177e4
LT		 1581
1582 /* Drop reports with not link local source */
0660e03f 1583 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1584 if (addr_type != IPV6_ADDR_ANY &&
1da177e4 1585 !(addr_type&IPV6_ADDR_LINKLOCAL))
63ed8de4 1586 goto kfree_skb;
1da177e4 1587
63ed8de4 1588 idev = in6_dev_get(skb->dev);
63159f29 1589 if (!idev)
63ed8de4 1590 goto kfree_skb;
1da177e4
LT		 1591
1592 /*
2d9a93b4 1593 * Cancel the work for this group
1da177e4
LT		 1594 */
1595
63ed8de4 1596 for_each_mc_mclock(idev, ma) {
6e7cb837 1597 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
2d9a93b4 1598 if (cancel_delayed_work(&ma->mca_work))
d3981bc6 1599 refcount_dec(&ma->mca_refcnt);
88e2ca30
TY		 1600 ma->mca_flags &= ~(MAF_LAST_REPORTER |
1601 MAF_TIMER_RUNNING);
1da177e4
LT		 1602 break;
1603 }
1604 }
f185de28 1605
63ed8de4
TY		 1606 in6_dev_put(idev);
1607kfree_skb:
f185de28
TY		 1608 consume_skb(skb);
1609}
1610
1611static void mld_report_work(struct work_struct *work)
1612{
1613 struct inet6_dev *idev = container_of(to_delayed_work(work),
1614 struct inet6_dev,
1615 mc_report_work);
1616 struct sk_buff_head q;
1617 struct sk_buff *skb;
1618 bool rework = false;
1619 int cnt = 0;
1620
1621 skb_queue_head_init(&q);
1622 spin_lock_bh(&idev->mc_report_lock);
1623 while ((skb = __skb_dequeue(&idev->mc_report_queue))) {
1624 __skb_queue_tail(&q, skb);
1625
1626 if (++cnt >= MLD_MAX_QUEUE) {
1627 rework = true;
f185de28
TY		 1628 break;
1629 }
1630 }
1631 spin_unlock_bh(&idev->mc_report_lock);
1632
63ed8de4 1633 mutex_lock(&idev->mc_lock);
f185de28
TY		 1634 while ((skb = __skb_dequeue(&q)))
1635 __mld_report_work(skb);
63ed8de4 1636 mutex_unlock(&idev->mc_lock);
f185de28 1637
3e7d18b9
TY		 1638 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0))
1639 return;
1640
1641 in6_dev_put(idev);
1da177e4
LT		 1642}
1643
a50feda5
ED		 1644static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1645 int gdeleted, int sdeleted)
1da177e4
LT		 1646{
1647 switch (type) {
1648 case MLD2_MODE_IS_INCLUDE:
1649 case MLD2_MODE_IS_EXCLUDE:
1650 if (gdeleted || sdeleted)
a50feda5 1651 return false;
5ab4a6c8
DS		 1652 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1653 if (pmc->mca_sfmode == MCAST_INCLUDE)
a50feda5 1654 return true;
5ab4a6c8
DS		 1655 /* don't include if this source is excluded
1656 * in all filters
1657 */
1658 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1659 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1660 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1661 psf->sf_count[MCAST_EXCLUDE];
1662 }
a50feda5 1663 return false;
1da177e4
LT		 1664 case MLD2_CHANGE_TO_INCLUDE:
1665 if (gdeleted || sdeleted)
a50feda5 1666 return false;
1da177e4
LT		 1667 return psf->sf_count[MCAST_INCLUDE] != 0;
1668 case MLD2_CHANGE_TO_EXCLUDE:
1669 if (gdeleted || sdeleted)
a50feda5 1670 return false;
1da177e4
LT		 1671 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1672 psf->sf_count[MCAST_INCLUDE])
a50feda5 1673 return false;
1da177e4
LT		 1674 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1675 psf->sf_count[MCAST_EXCLUDE];
1676 case MLD2_ALLOW_NEW_SOURCES:
1677 if (gdeleted || !psf->sf_crcount)
a50feda5 1678 return false;
1da177e4
LT		 1679 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1680 case MLD2_BLOCK_OLD_SOURCES:
1681 if (pmc->mca_sfmode == MCAST_INCLUDE)
1682 return gdeleted || (psf->sf_crcount && sdeleted);
1683 return psf->sf_crcount && !gdeleted && !sdeleted;
1684 }
a50feda5 1685 return false;
1da177e4
LT		 1686}
1687
1688static int
1689mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1690{
1691 struct ip6_sf_list *psf;
1692 int scount = 0;
1693
63ed8de4 1694 for_each_psf_mclock(pmc, psf) {
1da177e4
LT		 1695 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1696 continue;
1697 scount++;
1698 }
1699 return scount;
1700}
1701
2576f17d
YH		 1702static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1703 struct net_device *dev,
1704 const struct in6_addr *saddr,
1705 const struct in6_addr *daddr,
1706 int proto, int len)
1707{
1708 struct ipv6hdr *hdr;
1709
1710 skb->protocol = htons(ETH_P_IPV6);
1711 skb->dev = dev;
1712
1713 skb_reset_network_header(skb);
1714 skb_put(skb, sizeof(struct ipv6hdr));
1715 hdr = ipv6_hdr(skb);
1716
1717 ip6_flow_hdr(hdr, 0, 0);
1718
1719 hdr->payload_len = htons(len);
1720 hdr->nexthdr = proto;
1721 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1722
1723 hdr->saddr = *saddr;
1724 hdr->daddr = *daddr;
1725}
1726
4c672e4b 1727static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1da177e4 1728{
ffa85b73
TY		 1729 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
1730 2, 0, 0, IPV6_TLV_PADN, 0 };
8965779d 1731 struct net_device *dev = idev->dev;
a7ae1992
HX		 1732 int hlen = LL_RESERVED_SPACE(dev);
1733 int tlen = dev->needed_tailroom;
ffa85b73
TY		 1734 struct net *net = dev_net(dev);
1735 const struct in6_addr *saddr;
1736 struct in6_addr addr_buf;
1737 struct mld2_report *pmr;
1738 struct sk_buff *skb;
1739 unsigned int size;
1740 struct sock *sk;
1da177e4 1741 int err;
1da177e4 1742
ffa85b73
TY		 1743 sk = net->ipv6.igmp_sk;
1744 /* we assume size > sizeof(ra) here
1745 * Also try to not allocate high-order pages for big MTU
1746 */
1747 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
72e09ad1 1748 skb = sock_alloc_send_skb(sk, size, 1, &err);
cfcabdcc 1749 if (!skb)
1da177e4
LT		 1750 return NULL;
1751
9d4a0314 1752 skb->priority = TC_PRIO_CONTROL;
a7ae1992 1753 skb_reserve(skb, hlen);
1837b2e2 1754 skb_tailroom_reserve(skb, mtu, tlen);
1da177e4 1755
26394fc1 1756 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1757 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1758 * use unspecified address as the source address
1da177e4
LT		 1759 * when a valid link-local address is not available.
1760 */
d7aabf22
YH		 1761 saddr = &in6addr_any;
1762 } else
1763 saddr = &addr_buf;
1da177e4 1764
2576f17d 1765 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4 1766
59ae1d12 1767 skb_put_data(skb, ra, sizeof(ra));
1da177e4 1768
27a884dc 1769 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1770 skb_put(skb, sizeof(*pmr));
1771 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837
YH		 1772 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1773 pmr->mld2r_resv1 = 0;
1774 pmr->mld2r_cksum = 0;
1775 pmr->mld2r_resv2 = 0;
1776 pmr->mld2r_ngrec = 0;
1da177e4
LT		 1777 return skb;
1778}
1779
1780static void mld_sendpack(struct sk_buff *skb)
1781{
0660e03f 1782 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1783 struct mld2_report *pmr =
1784 (struct mld2_report *)skb_transport_header(skb);
1da177e4 1785 int payload_len, mldlen;
96b52e61 1786 struct inet6_dev *idev;
c346dca1 1787 struct net *net = dev_net(skb->dev);
1da177e4 1788 int err;
4c9483b2 1789 struct flowi6 fl6;
adf30907 1790 struct dst_entry *dst;
1da177e4 1791
96b52e61
ED		 1792 rcu_read_lock();
1793 idev = __in6_dev_get(skb->dev);
edf391ff
NH		 1794 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1795
29a3cad5
SH		 1796 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1797 sizeof(*pip6);
1798 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1da177e4
LT		 1799 pip6->payload_len = htons(payload_len);
1800
6e7cb837
YH		 1801 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1802 IPPROTO_ICMPV6,
1803 csum_partial(skb_transport_header(skb),
1804 mldlen, 0));
41927178 1805
4c9483b2 1806 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
41927178
YH		 1807 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1808 skb->dev->ifindex);
12fd84f4 1809 dst = icmp6_dst_alloc(skb->dev, &fl6);
41927178 1810
452edd59
DM		 1811 err = 0;
1812 if (IS_ERR(dst)) {
1813 err = PTR_ERR(dst);
1814 dst = NULL;
1815 }
adf30907 1816 skb_dst_set(skb, dst);
41927178
YH		 1817 if (err)
1818 goto err_out;
1819
7026b1dd 1820 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
29a26a56 1821 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
13206b6b 1822 dst_output);
41927178 1823out:
1da177e4 1824 if (!err) {
43a43b60
HFS		 1825 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1826 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
43a43b60
HFS		 1827 } else {
1828 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1829 }
1da177e4 1830
96b52e61 1831 rcu_read_unlock();
41927178
YH		 1832 return;
1833
1834err_out:
1835 kfree_skb(skb);
1836 goto out;
1da177e4
LT		 1837}
1838
1839static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1840{
fab10fe3 1841 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1842}
1843
1844static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
b9b312a7 1845 int type, struct mld2_grec **ppgr, unsigned int mtu)
1da177e4 1846{
1da177e4
LT		 1847 struct mld2_report *pmr;
1848 struct mld2_grec *pgr;
1849
b9b312a7
ED		 1850 if (!skb) {
1851 skb = mld_newpack(pmc->idev, mtu);
1852 if (!skb)
1853 return NULL;
1854 }
4df864c1 1855 pgr = skb_put(skb, sizeof(struct mld2_grec));
1da177e4
LT		 1856 pgr->grec_type = type;
1857 pgr->grec_auxwords = 0;
1858 pgr->grec_nsrcs = 0;
1859 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1860 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837 1861 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1da177e4
LT		 1862 *ppgr = pgr;
1863 return skb;
1864}
1865
4c672e4b 1866#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1da177e4 1867
63ed8de4 1868/* called with mc_lock */
1da177e4 1869static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
4b200e39
TY		 1870 int type, int gdeleted, int sdeleted,
1871 int crsend)
1da177e4 1872{
4b200e39
TY		 1873 struct ip6_sf_list *psf, *psf_prev, *psf_next;
1874 int scount, stotal, first, isquery, truncate;
1875 struct ip6_sf_list __rcu **psf_list;
8965779d
AW		 1876 struct inet6_dev *idev = pmc->idev;
1877 struct net_device *dev = idev->dev;
1da177e4 1878 struct mld2_grec *pgr = NULL;
4b200e39 1879 struct mld2_report *pmr;
b9b312a7 1880 unsigned int mtu;
1da177e4
LT		 1881
1882 if (pmc->mca_flags & MAF_NOREPORT)
1883 return skb;
1884
b9b312a7
ED		 1885 mtu = READ_ONCE(dev->mtu);
1886 if (mtu < IPV6_MIN_MTU)
1887 return skb;
1888
1da177e4
LT		 1889 isquery = type == MLD2_MODE_IS_INCLUDE ||
1890 type == MLD2_MODE_IS_EXCLUDE;
1891 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1892 type == MLD2_CHANGE_TO_EXCLUDE;
1893
5ab4a6c8
DS		 1894 stotal = scount = 0;
1895
1da177e4
LT		 1896 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1897
4b200e39 1898 if (!rcu_access_pointer(*psf_list))
5ab4a6c8
DS		 1899 goto empty_source;
1900
9c70220b 1901 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1902
1903 /* EX and TO_EX get a fresh packet, if needed */
1904 if (truncate) {
6e7cb837 1905 if (pmr && pmr->mld2r_ngrec &&
1da177e4
LT		 1906 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1907 if (skb)
1908 mld_sendpack(skb);
b9b312a7 1909 skb = mld_newpack(idev, mtu);
1da177e4
LT		 1910 }
1911 }
1912 first = 1;
1da177e4 1913 psf_prev = NULL;
63ed8de4 1914 for (psf = mc_dereference(*psf_list, idev);
4b200e39
TY		 1915 psf;
1916 psf = psf_next) {
1da177e4
LT		 1917 struct in6_addr *psrc;
1918
63ed8de4 1919 psf_next = mc_dereference(psf->sf_next, idev);
1da177e4 1920
c7ea20c9 1921 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1da177e4
LT		 1922 psf_prev = psf;
1923 continue;
1924 }
1925
a052517a
HL		 1926 /* Based on RFC3810 6.1. Should not send source-list change
1927 * records when there is a filter mode change.
1928 */
1929 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1930 (!gdeleted && pmc->mca_crcount)) &&
1931 (type == MLD2_ALLOW_NEW_SOURCES ||
1932 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1933 goto decrease_sf_crcount;
1934
1da177e4
LT		 1935 /* clear marks on query responses */
1936 if (isquery)
1937 psf->sf_gsresp = 0;
1938
1939 if (AVAILABLE(skb) < sizeof(*psrc) +
1940 first*sizeof(struct mld2_grec)) {
1941 if (truncate && !first)
1942 break; /* truncate these */
1943 if (pgr)
1944 pgr->grec_nsrcs = htons(scount);
1945 if (skb)
1946 mld_sendpack(skb);
b9b312a7 1947 skb = mld_newpack(idev, mtu);
1da177e4
LT		 1948 first = 1;
1949 scount = 0;
1950 }
1951 if (first) {
b9b312a7 1952 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1da177e4
LT		 1953 first = 0;
1954 }
cc63f70b
AD		 1955 if (!skb)
1956 return NULL;
4df864c1 1957 psrc = skb_put(skb, sizeof(*psrc));
1da177e4 1958 *psrc = psf->sf_addr;
5ab4a6c8 1959 scount++; stotal++;
1da177e4
LT		 1960 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1961 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
a052517a 1962decrease_sf_crcount:
1da177e4
LT		 1963 psf->sf_crcount--;
1964 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1965 if (psf_prev)
4b200e39 1966 rcu_assign_pointer(psf_prev->sf_next,
63ed8de4 1967 mc_dereference(psf->sf_next, idev));
1da177e4 1968 else
4b200e39 1969 rcu_assign_pointer(*psf_list,
63ed8de4 1970 mc_dereference(psf->sf_next, idev));
4b200e39 1971 kfree_rcu(psf, rcu);
1da177e4
LT		 1972 continue;
1973 }
1974 }
1975 psf_prev = psf;
1976 }
5ab4a6c8
DS		 1977
1978empty_source:
1979 if (!stotal) {
1980 if (type == MLD2_ALLOW_NEW_SOURCES ||
1981 type == MLD2_BLOCK_OLD_SOURCES)
1982 return skb;
6a7cc418 1983 if (pmc->mca_crcount || isquery || crsend) {
5ab4a6c8
DS		 1984 /* make sure we have room for group header */
1985 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1986 mld_sendpack(skb);
1987 skb = NULL; /* add_grhead will get a new one */
1988 }
b9b312a7 1989 skb = add_grhead(skb, pmc, type, &pgr, mtu);
5ab4a6c8
DS		 1990 }
1991 }
1da177e4
LT		 1992 if (pgr)
1993 pgr->grec_nsrcs = htons(scount);
1994
1995 if (isquery)
1996 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1997 return skb;
1998}
1999
63ed8de4 2000/* called with mc_lock */
1da177e4
LT		 2001static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
2002{
2003 struct sk_buff *skb = NULL;
2004 int type;
2005
2006 if (!pmc) {
63ed8de4 2007 for_each_mc_mclock(idev, pmc) {
1da177e4
LT		 2008 if (pmc->mca_flags & MAF_NOREPORT)
2009 continue;
1da177e4
LT		 2010 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2011 type = MLD2_MODE_IS_EXCLUDE;
2012 else
2013 type = MLD2_MODE_IS_INCLUDE;
6a7cc418 2014 skb = add_grec(skb, pmc, type, 0, 0, 0);
1da177e4 2015 }
1da177e4 2016 } else {
1da177e4
LT		 2017 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2018 type = MLD2_MODE_IS_EXCLUDE;
2019 else
2020 type = MLD2_MODE_IS_INCLUDE;
6a7cc418 2021 skb = add_grec(skb, pmc, type, 0, 0, 0);
1da177e4
LT		 2022 }
2023 if (skb)
2024 mld_sendpack(skb);
2025}
2026
2027/*
2028 * remove zero-count source records from a source filter list
63ed8de4 2029 * called with mc_lock
1da177e4 2030 */
63ed8de4 2031static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev)
1da177e4
LT		 2032{
2033 struct ip6_sf_list *psf_prev, *psf_next, *psf;
2034
2035 psf_prev = NULL;
63ed8de4 2036 for (psf = mc_dereference(*ppsf, idev);
4b200e39
TY		 2037 psf;
2038 psf = psf_next) {
63ed8de4 2039 psf_next = mc_dereference(psf->sf_next, idev);
1da177e4
LT		 2040 if (psf->sf_crcount == 0) {
2041 if (psf_prev)
4b200e39 2042 rcu_assign_pointer(psf_prev->sf_next,
63ed8de4 2043 mc_dereference(psf->sf_next, idev));
1da177e4 2044 else
4b200e39 2045 rcu_assign_pointer(*ppsf,
63ed8de4 2046 mc_dereference(psf->sf_next, idev));
4b200e39
TY		 2047 kfree_rcu(psf, rcu);
2048 } else {
1da177e4 2049 psf_prev = psf;
4b200e39 2050 }
1da177e4
LT		 2051 }
2052}
2053
63ed8de4 2054/* called with mc_lock */
1da177e4
LT		 2055static void mld_send_cr(struct inet6_dev *idev)
2056{
2057 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
2058 struct sk_buff *skb = NULL;
2059 int type, dtype;
2060
1da177e4
LT		 2061 /* deleted MCA's */
2062 pmc_prev = NULL;
63ed8de4 2063 for (pmc = mc_dereference(idev->mc_tomb, idev);
88e2ca30
TY		 2064 pmc;
2065 pmc = pmc_next) {
63ed8de4 2066 pmc_next = mc_dereference(pmc->next, idev);
1da177e4
LT		 2067 if (pmc->mca_sfmode == MCAST_INCLUDE) {
2068 type = MLD2_BLOCK_OLD_SOURCES;
2069 dtype = MLD2_BLOCK_OLD_SOURCES;
6a7cc418
FL		 2070 skb = add_grec(skb, pmc, type, 1, 0, 0);
2071 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1da177e4
LT		 2072 }
2073 if (pmc->mca_crcount) {
1da177e4
LT		 2074 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
2075 type = MLD2_CHANGE_TO_INCLUDE;
6a7cc418 2076 skb = add_grec(skb, pmc, type, 1, 0, 0);
1da177e4 2077 }
5ab4a6c8 2078 pmc->mca_crcount--;
1da177e4 2079 if (pmc->mca_crcount == 0) {
63ed8de4
TY		 2080 mld_clear_zeros(&pmc->mca_tomb, idev);
2081 mld_clear_zeros(&pmc->mca_sources, idev);
1da177e4
LT		 2082 }
2083 }
4b200e39
TY		 2084 if (pmc->mca_crcount == 0 &&
2085 !rcu_access_pointer(pmc->mca_tomb) &&
2086 !rcu_access_pointer(pmc->mca_sources)) {
1da177e4 2087 if (pmc_prev)
88e2ca30 2088 rcu_assign_pointer(pmc_prev->next, pmc_next);
1da177e4 2089 else
88e2ca30 2090 rcu_assign_pointer(idev->mc_tomb, pmc_next);
1da177e4 2091 in6_dev_put(pmc->idev);
88e2ca30 2092 kfree_rcu(pmc, rcu);
1da177e4
LT		 2093 } else
2094 pmc_prev = pmc;
2095 }
1da177e4
LT		 2096
2097 /* change recs */
63ed8de4 2098 for_each_mc_mclock(idev, pmc) {
1da177e4
LT		 2099 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2100 type = MLD2_BLOCK_OLD_SOURCES;
2101 dtype = MLD2_ALLOW_NEW_SOURCES;
2102 } else {
2103 type = MLD2_ALLOW_NEW_SOURCES;
2104 dtype = MLD2_BLOCK_OLD_SOURCES;
2105 }
6a7cc418
FL		 2106 skb = add_grec(skb, pmc, type, 0, 0, 0);
2107 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1da177e4
LT		 2108
2109 /* filter mode changes */
2110 if (pmc->mca_crcount) {
1da177e4
LT		 2111 if (pmc->mca_sfmode == MCAST_EXCLUDE)
2112 type = MLD2_CHANGE_TO_EXCLUDE;
2113 else
2114 type = MLD2_CHANGE_TO_INCLUDE;
6a7cc418 2115 skb = add_grec(skb, pmc, type, 0, 0, 0);
5ab4a6c8 2116 pmc->mca_crcount--;
1da177e4 2117 }
1da177e4 2118 }
1da177e4
LT		 2119 if (!skb)
2120 return;
2121 (void) mld_sendpack(skb);
2122}
2123
2124static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
2125{
c346dca1 2126 struct net *net = dev_net(dev);
b8ad0cbc 2127 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 2128 struct inet6_dev *idev;
1ab1457c 2129 struct sk_buff *skb;
6e7cb837 2130 struct mld_msg *hdr;
d7aabf22 2131 const struct in6_addr *snd_addr, *saddr;
1da177e4 2132 struct in6_addr addr_buf;
a7ae1992
HX		 2133 int hlen = LL_RESERVED_SPACE(dev);
2134 int tlen = dev->needed_tailroom;
1da177e4
LT		 2135 int err, len, payload_len, full_len;
2136 u8 ra[8] = { IPPROTO_ICMPV6, 0,
2137 IPV6_TLV_ROUTERALERT, 2, 0, 0,
2138 IPV6_TLV_PADN, 0 };
4c9483b2 2139 struct flowi6 fl6;
adf30907 2140 struct dst_entry *dst;
1da177e4 2141
f3ee4010
YH		 2142 if (type == ICMPV6_MGM_REDUCTION)
2143 snd_addr = &in6addr_linklocal_allrouters;
2144 else
2145 snd_addr = addr;
1da177e4
LT		 2146
2147 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2148 payload_len = len + sizeof(ra);
2149 full_len = sizeof(struct ipv6hdr) + payload_len;
2150
edf391ff
NH		 2151 rcu_read_lock();
2152 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2153 IPSTATS_MIB_OUT, full_len);
2154 rcu_read_unlock();
2155
a7ae1992 2156 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1da177e4 2157
63159f29 2158 if (!skb) {
a11d206d 2159 rcu_read_lock();
3bd653c8 2160 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH		 2161 IPSTATS_MIB_OUTDISCARDS);
2162 rcu_read_unlock();
1da177e4
LT		 2163 return;
2164 }
9d4a0314 2165 skb->priority = TC_PRIO_CONTROL;
a7ae1992 2166 skb_reserve(skb, hlen);
1da177e4 2167
95c385b4 2168 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 2169 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 2170 * use unspecified address as the source address
1da177e4
LT		 2171 * when a valid link-local address is not available.
2172 */
d7aabf22
YH		 2173 saddr = &in6addr_any;
2174 } else
2175 saddr = &addr_buf;
1da177e4 2176
2576f17d 2177 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4 2178
59ae1d12 2179 skb_put_data(skb, ra, sizeof(ra));
1da177e4 2180
b080db58 2181 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
6e7cb837 2182 hdr->mld_type = type;
4e3fd7a0 2183 hdr->mld_mca = *addr;
1da177e4 2184
6e7cb837
YH		 2185 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2186 IPPROTO_ICMPV6,
2187 csum_partial(hdr, len, 0));
1da177e4 2188
96b52e61
ED		 2189 rcu_read_lock();
2190 idev = __in6_dev_get(skb->dev);
1da177e4 2191
4c9483b2 2192 icmpv6_flow_init(sk, &fl6, type,
41927178
YH		 2193 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2194 skb->dev->ifindex);
12fd84f4 2195 dst = icmp6_dst_alloc(skb->dev, &fl6);
452edd59
DM		 2196 if (IS_ERR(dst)) {
2197 err = PTR_ERR(dst);
41927178 2198 goto err_out;
452edd59 2199 }
41927178 2200
adf30907 2201 skb_dst_set(skb, dst);
29a26a56
EB		 2202 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2203 net, sk, skb, NULL, skb->dev,
13206b6b 2204 dst_output);
41927178 2205out:
1da177e4 2206 if (!err) {
5c5d244b 2207 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 2208 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4 2209 } else
3bd653c8 2210 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 2211
96b52e61 2212 rcu_read_unlock();
1da177e4 2213 return;
41927178
YH		 2214
2215err_out:
2216 kfree_skb(skb);
2217 goto out;
1da177e4
LT		 2218}
2219
63ed8de4 2220/* called with mc_lock */
6a7cc418 2221static void mld_send_initial_cr(struct inet6_dev *idev)
b173ee48 2222{
6a7cc418
FL		 2223 struct sk_buff *skb;
2224 struct ifmcaddr6 *pmc;
2225 int type;
2226
2227 if (mld_in_v1_mode(idev))
2228 return;
2229
2230 skb = NULL;
63ed8de4 2231 for_each_mc_mclock(idev, pmc) {
6a7cc418
FL		 2232 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2233 type = MLD2_CHANGE_TO_EXCLUDE;
2234 else
c7ea20c9 2235 type = MLD2_ALLOW_NEW_SOURCES;
6a7cc418 2236 skb = add_grec(skb, pmc, type, 0, 0, 1);
b173ee48 2237 }
6a7cc418
FL		 2238 if (skb)
2239 mld_sendpack(skb);
b173ee48
HFS		 2240}
2241
2242void ipv6_mc_dad_complete(struct inet6_dev *idev)
2243{
63ed8de4 2244 mutex_lock(&idev->mc_lock);
b173ee48
HFS		 2245 idev->mc_dad_count = idev->mc_qrv;
2246 if (idev->mc_dad_count) {
6a7cc418 2247 mld_send_initial_cr(idev);
b173ee48
HFS		 2248 idev->mc_dad_count--;
2249 if (idev->mc_dad_count)
2d9a93b4
TY		 2250 mld_dad_start_work(idev,
2251 unsolicited_report_interval(idev));
b173ee48 2252 }
63ed8de4 2253 mutex_unlock(&idev->mc_lock);
b173ee48
HFS		 2254}
2255
2d9a93b4 2256static void mld_dad_work(struct work_struct *work)
b173ee48 2257{
2d9a93b4
TY		 2258 struct inet6_dev *idev = container_of(to_delayed_work(work),
2259 struct inet6_dev,
2260 mc_dad_work);
63ed8de4 2261 mutex_lock(&idev->mc_lock);
6a7cc418 2262 mld_send_initial_cr(idev);
b173ee48
HFS		 2263 if (idev->mc_dad_count) {
2264 idev->mc_dad_count--;
2265 if (idev->mc_dad_count)
2d9a93b4
TY		 2266 mld_dad_start_work(idev,
2267 unsolicited_report_interval(idev));
b173ee48 2268 }
63ed8de4 2269 mutex_unlock(&idev->mc_lock);
9260d3e1 2270 in6_dev_put(idev);
b173ee48
HFS		 2271}
2272
63ed8de4 2273/* called with mc_lock */
1da177e4 2274static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
b71d1d42 2275 const struct in6_addr *psfsrc)
1da177e4
LT		 2276{
2277 struct ip6_sf_list *psf, *psf_prev;
2278 int rv = 0;
2279
2280 psf_prev = NULL;
63ed8de4 2281 for_each_psf_mclock(pmc, psf) {
1da177e4
LT		 2282 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2283 break;
2284 psf_prev = psf;
2285 }
2286 if (!psf || psf->sf_count[sfmode] == 0) {
2287 /* source filter not found, or count wrong => bug */
2288 return -ESRCH;
2289 }
2290 psf->sf_count[sfmode]--;
2291 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2292 struct inet6_dev *idev = pmc->idev;
2293
2294 /* no more filters for this source */
2295 if (psf_prev)
4b200e39 2296 rcu_assign_pointer(psf_prev->sf_next,
63ed8de4 2297 mc_dereference(psf->sf_next, idev));
1da177e4 2298 else
4b200e39 2299 rcu_assign_pointer(pmc->mca_sources,
63ed8de4 2300 mc_dereference(psf->sf_next, idev));
4b200e39 2301
1da177e4 2302 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
6c567b78 2303 !mld_in_v1_mode(idev)) {
1da177e4 2304 psf->sf_crcount = idev->mc_qrv;
4b200e39 2305 rcu_assign_pointer(psf->sf_next,
63ed8de4 2306 mc_dereference(pmc->mca_tomb, idev));
4b200e39 2307 rcu_assign_pointer(pmc->mca_tomb, psf);
1da177e4 2308 rv = 1;
4b200e39
TY		 2309 } else {
2310 kfree_rcu(psf, rcu);
2311 }
1da177e4
LT		 2312 }
2313 return rv;
2314}
2315
63ed8de4 2316/* called with mc_lock */
b71d1d42
ED		 2317static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2318 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 2319 int delta)
2320{
2321 struct ifmcaddr6 *pmc;
2322 int changerec = 0;
2323 int i, err;
2324
2325 if (!idev)
2326 return -ENODEV;
88e2ca30 2327
63ed8de4 2328 for_each_mc_mclock(idev, pmc) {
1da177e4
LT		 2329 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2330 break;
2331 }
88e2ca30 2332 if (!pmc)
1da177e4 2333 return -ESRCH;
88e2ca30 2334
1da177e4
LT		 2335 sf_markstate(pmc);
2336 if (!delta) {
63ed8de4 2337 if (!pmc->mca_sfcount[sfmode])
1da177e4 2338 return -EINVAL;
88e2ca30 2339
1da177e4
LT		 2340 pmc->mca_sfcount[sfmode]--;
2341 }
2342 err = 0;
67ba4152 2343 for (i = 0; i < sfcount; i++) {
1da177e4
LT		 2344 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2345
2346 changerec |= rv > 0;
2347 if (!err && rv < 0)
2348 err = rv;
2349 }
2350 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2351 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2352 pmc->mca_sfcount[MCAST_INCLUDE]) {
2353 struct ip6_sf_list *psf;
2354
2355 /* filter mode change */
2356 pmc->mca_sfmode = MCAST_INCLUDE;
2357 pmc->mca_crcount = idev->mc_qrv;
2358 idev->mc_ifc_count = pmc->mca_crcount;
63ed8de4 2359 for_each_psf_mclock(pmc, psf)
1da177e4
LT		 2360 psf->sf_crcount = 0;
2361 mld_ifc_event(pmc->idev);
63ed8de4 2362 } else if (sf_setstate(pmc) || changerec) {
1da177e4 2363 mld_ifc_event(pmc->idev);
63ed8de4
TY		 2364 }
2365
1da177e4
LT		 2366 return err;
2367}
2368
2369/*
2370 * Add multicast single-source filter to the interface list
63ed8de4 2371 * called with mc_lock
1da177e4
LT		 2372 */
2373static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
99d2f47a 2374 const struct in6_addr *psfsrc)
1da177e4
LT		 2375{
2376 struct ip6_sf_list *psf, *psf_prev;
2377
2378 psf_prev = NULL;
63ed8de4 2379 for_each_psf_mclock(pmc, psf) {
1da177e4
LT		 2380 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2381 break;
2382 psf_prev = psf;
2383 }
2384 if (!psf) {
f185de28 2385 psf = kzalloc(sizeof(*psf), GFP_KERNEL);
1da177e4
LT		 2386 if (!psf)
2387 return -ENOBUFS;
0c600eda 2388
1da177e4
LT		 2389 psf->sf_addr = *psfsrc;
2390 if (psf_prev) {
4b200e39
TY		 2391 rcu_assign_pointer(psf_prev->sf_next, psf);
2392 } else {
2393 rcu_assign_pointer(pmc->mca_sources, psf);
2394 }
1da177e4
LT		 2395 }
2396 psf->sf_count[sfmode]++;
2397 return 0;
2398}
2399
63ed8de4 2400/* called with mc_lock */
1da177e4
LT		 2401static void sf_markstate(struct ifmcaddr6 *pmc)
2402{
2403 struct ip6_sf_list *psf;
2404 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2405
63ed8de4 2406 for_each_psf_mclock(pmc, psf) {
1da177e4
LT		 2407 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2408 psf->sf_oldin = mca_xcount ==
2409 psf->sf_count[MCAST_EXCLUDE] &&
2410 !psf->sf_count[MCAST_INCLUDE];
4b200e39 2411 } else {
1da177e4 2412 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
4b200e39
TY		 2413 }
2414 }
1da177e4
LT		 2415}
2416
63ed8de4 2417/* called with mc_lock */
1da177e4
LT		 2418static int sf_setstate(struct ifmcaddr6 *pmc)
2419{
7add2a43 2420 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 2421 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2422 int qrv = pmc->idev->mc_qrv;
2423 int new_in, rv;
2424
2425 rv = 0;
63ed8de4 2426 for_each_psf_mclock(pmc, psf) {
1da177e4
LT		 2427 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2428 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2429 !psf->sf_count[MCAST_INCLUDE];
2430 } else
2431 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 2432 if (new_in) {
2433 if (!psf->sf_oldin) {
e80e28b6 2434 struct ip6_sf_list *prev = NULL;
7add2a43 2435
4b200e39 2436 for_each_psf_tomb(pmc, dpsf) {
7add2a43
DS		 2437 if (ipv6_addr_equal(&dpsf->sf_addr,
2438 &psf->sf_addr))
2439 break;
2440 prev = dpsf;
2441 }
2442 if (dpsf) {
2443 if (prev)
4b200e39 2444 rcu_assign_pointer(prev->sf_next,
63ed8de4
TY		 2445 mc_dereference(dpsf->sf_next,
2446 pmc->idev));
7add2a43 2447 else
4b200e39 2448 rcu_assign_pointer(pmc->mca_tomb,
63ed8de4
TY		 2449 mc_dereference(dpsf->sf_next,
2450 pmc->idev));
4b200e39 2451 kfree_rcu(dpsf, rcu);
7add2a43
DS		 2452 }
2453 psf->sf_crcount = qrv;
2454 rv++;
2455 }
2456 } else if (psf->sf_oldin) {
2457 psf->sf_crcount = 0;
2458 /*
2459 * add or update "delete" records if an active filter
2460 * is now inactive
2461 */
4b200e39
TY		 2462
2463 for_each_psf_tomb(pmc, dpsf)
7add2a43
DS		 2464 if (ipv6_addr_equal(&dpsf->sf_addr,
2465 &psf->sf_addr))
2466 break;
2467 if (!dpsf) {
f185de28 2468 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL);
7add2a43
DS		 2469 if (!dpsf)
2470 continue;
2471 *dpsf = *psf;
4b200e39 2472 rcu_assign_pointer(dpsf->sf_next,
63ed8de4 2473 mc_dereference(pmc->mca_tomb, pmc->idev));
4b200e39 2474 rcu_assign_pointer(pmc->mca_tomb, dpsf);
7add2a43
DS		 2475 }
2476 dpsf->sf_crcount = qrv;
1da177e4
LT		 2477 rv++;
2478 }
2479 }
2480 return rv;
2481}
2482
2483/*
2484 * Add multicast source filter list to the interface list
63ed8de4 2485 * called with mc_lock
1da177e4 2486 */
b71d1d42
ED		 2487static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2488 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 2489 int delta)
2490{
2491 struct ifmcaddr6 *pmc;
2492 int isexclude;
2493 int i, err;
2494
2495 if (!idev)
2496 return -ENODEV;
88e2ca30 2497
63ed8de4 2498 for_each_mc_mclock(idev, pmc) {
1da177e4
LT		 2499 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2500 break;
2501 }
88e2ca30 2502 if (!pmc)
1da177e4 2503 return -ESRCH;
1da177e4
LT		 2504
2505 sf_markstate(pmc);
2506 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2507 if (!delta)
2508 pmc->mca_sfcount[sfmode]++;
2509 err = 0;
67ba4152 2510 for (i = 0; i < sfcount; i++) {
99d2f47a 2511 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT		 2512 if (err)
2513 break;
2514 }
2515 if (err) {
2516 int j;
2517
2518 if (!delta)
2519 pmc->mca_sfcount[sfmode]--;
67ba4152 2520 for (j = 0; j < i; j++)
78d50217 2521 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4 2522 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT		 2523 struct ip6_sf_list *psf;
2524
2525 /* filter mode change */
2526 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2527 pmc->mca_sfmode = MCAST_EXCLUDE;
2528 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2529 pmc->mca_sfmode = MCAST_INCLUDE;
2530 /* else no filters; keep old mode for reports */
2531
2532 pmc->mca_crcount = idev->mc_qrv;
2533 idev->mc_ifc_count = pmc->mca_crcount;
63ed8de4 2534 for_each_psf_mclock(pmc, psf)
1da177e4
LT		 2535 psf->sf_crcount = 0;
2536 mld_ifc_event(idev);
88e2ca30 2537 } else if (sf_setstate(pmc)) {
1da177e4 2538 mld_ifc_event(idev);
88e2ca30 2539 }
1da177e4
LT		 2540 return err;
2541}
2542
63ed8de4 2543/* called with mc_lock */
1da177e4
LT		 2544static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2545{
2546 struct ip6_sf_list *psf, *nextpsf;
2547
63ed8de4 2548 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev);
4b200e39
TY		 2549 psf;
2550 psf = nextpsf) {
63ed8de4 2551 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
4b200e39 2552 kfree_rcu(psf, rcu);
1da177e4 2553 }
4b200e39 2554 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
63ed8de4 2555 for (psf = mc_dereference(pmc->mca_sources, pmc->idev);
4b200e39
TY		 2556 psf;
2557 psf = nextpsf) {
63ed8de4 2558 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
4b200e39 2559 kfree_rcu(psf, rcu);
1da177e4 2560 }
4b200e39 2561 RCU_INIT_POINTER(pmc->mca_sources, NULL);
1da177e4 2562 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2563 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2564 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2565}
2566
63ed8de4 2567/* called with mc_lock */
1da177e4
LT		 2568static void igmp6_join_group(struct ifmcaddr6 *ma)
2569{
2570 unsigned long delay;
2571
2572 if (ma->mca_flags & MAF_NOREPORT)
2573 return;
2574
2575 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2576
8032bf12 2577 delay = get_random_u32_below(unsolicited_report_interval(ma->idev));
1da177e4 2578
2d9a93b4 2579 if (cancel_delayed_work(&ma->mca_work)) {
d3981bc6 2580 refcount_dec(&ma->mca_refcnt);
2d9a93b4 2581 delay = ma->mca_work.timer.expires - jiffies;
1da177e4
LT		 2582 }
2583
2d9a93b4 2584 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
d3981bc6 2585 refcount_inc(&ma->mca_refcnt);
1da177e4 2586 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
1da177e4
LT		 2587}
2588
2589static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2590 struct inet6_dev *idev)
2591{
882ba1f7 2592 struct ip6_sf_socklist *psl;
1da177e4
LT		 2593 int err;
2594
4b4b8446 2595 psl = sock_dereference(iml->sflist, sk);
882ba1f7 2596
63ed8de4
TY		 2597 if (idev)
2598 mutex_lock(&idev->mc_lock);
2599
882ba1f7 2600 if (!psl) {
1da177e4 2601 /* any-source empty exclude case */
dc012f36
ED		 2602 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2603 } else {
2604 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
63ed8de4 2605 psl->sl_count, psl->sl_addr, 0);
882ba1f7 2606 RCU_INIT_POINTER(iml->sflist, NULL);
e11c0e25
GS		 2607 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2608 &sk->sk_omem_alloc);
882ba1f7 2609 kfree_rcu(psl, rcu);
1da177e4 2610 }
63ed8de4
TY		 2611
2612 if (idev)
2613 mutex_unlock(&idev->mc_lock);
2614
1da177e4
LT		 2615 return err;
2616}
2617
63ed8de4 2618/* called with mc_lock */
1da177e4
LT		 2619static void igmp6_leave_group(struct ifmcaddr6 *ma)
2620{
6c567b78 2621 if (mld_in_v1_mode(ma->idev)) {
88e2ca30 2622 if (ma->mca_flags & MAF_LAST_REPORTER) {
1da177e4
LT		 2623 igmp6_send(&ma->mca_addr, ma->idev->dev,
2624 ICMPV6_MGM_REDUCTION);
88e2ca30 2625 }
1da177e4
LT		 2626 } else {
2627 mld_add_delrec(ma->idev, ma);
2628 mld_ifc_event(ma->idev);
2629 }
2630}
2631
2d9a93b4 2632static void mld_gq_work(struct work_struct *work)
1da177e4 2633{
2d9a93b4
TY		 2634 struct inet6_dev *idev = container_of(to_delayed_work(work),
2635 struct inet6_dev,
2636 mc_gq_work);
1da177e4 2637
63ed8de4 2638 mutex_lock(&idev->mc_lock);
1da177e4 2639 mld_send_report(idev, NULL);
88e2ca30 2640 idev->mc_gq_running = 0;
63ed8de4 2641 mutex_unlock(&idev->mc_lock);
88e2ca30 2642
9260d3e1 2643 in6_dev_put(idev);
1da177e4
LT		 2644}
2645
2d9a93b4 2646static void mld_ifc_work(struct work_struct *work)
1da177e4 2647{
2d9a93b4
TY		 2648 struct inet6_dev *idev = container_of(to_delayed_work(work),
2649 struct inet6_dev,
2650 mc_ifc_work);
1da177e4 2651
63ed8de4 2652 mutex_lock(&idev->mc_lock);
1da177e4 2653 mld_send_cr(idev);
88e2ca30 2654
1da177e4
LT		 2655 if (idev->mc_ifc_count) {
2656 idev->mc_ifc_count--;
2657 if (idev->mc_ifc_count)
2d9a93b4
TY		 2658 mld_ifc_start_work(idev,
2659 unsolicited_report_interval(idev));
1da177e4 2660 }
63ed8de4 2661 mutex_unlock(&idev->mc_lock);
9260d3e1 2662 in6_dev_put(idev);
1da177e4
LT		 2663}
2664
63ed8de4 2665/* called with mc_lock */
1da177e4
LT		 2666static void mld_ifc_event(struct inet6_dev *idev)
2667{
6c567b78 2668 if (mld_in_v1_mode(idev))
1da177e4 2669 return;
88e2ca30 2670
1da177e4 2671 idev->mc_ifc_count = idev->mc_qrv;
2d9a93b4 2672 mld_ifc_start_work(idev, 1);
1da177e4
LT		 2673}
2674
2d9a93b4 2675static void mld_mca_work(struct work_struct *work)
1da177e4 2676{
2d9a93b4
TY		 2677 struct ifmcaddr6 *ma = container_of(to_delayed_work(work),
2678 struct ifmcaddr6, mca_work);
1da177e4 2679
63ed8de4 2680 mutex_lock(&ma->idev->mc_lock);
6c567b78 2681 if (mld_in_v1_mode(ma->idev))
1da177e4
LT		 2682 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2683 else
2684 mld_send_report(ma->idev, ma);
1da177e4
LT		 2685 ma->mca_flags |= MAF_LAST_REPORTER;
2686 ma->mca_flags &= ~MAF_TIMER_RUNNING;
63ed8de4 2687 mutex_unlock(&ma->idev->mc_lock);
f185de28 2688
1da177e4
LT		 2689 ma_put(ma);
2690}
2691
75c78500
MS		 2692/* Device changing type */
2693
2694void ipv6_mc_unmap(struct inet6_dev *idev)
2695{
2696 struct ifmcaddr6 *i;
2697
2698 /* Install multicast list, except for all-nodes (already installed) */
2699
63ed8de4
TY		 2700 mutex_lock(&idev->mc_lock);
2701 for_each_mc_mclock(idev, i)
75c78500 2702 igmp6_group_dropped(i);
63ed8de4 2703 mutex_unlock(&idev->mc_lock);
75c78500
MS		 2704}
2705
2706void ipv6_mc_remap(struct inet6_dev *idev)
2707{
2708 ipv6_mc_up(idev);
2709}
2710
1da177e4 2711/* Device going down */
1da177e4
LT		 2712void ipv6_mc_down(struct inet6_dev *idev)
2713{
2714 struct ifmcaddr6 *i;
2715
63ed8de4 2716 mutex_lock(&idev->mc_lock);
1da177e4 2717 /* Withdraw multicast list */
63ed8de4 2718 for_each_mc_mclock(idev, i)
1da177e4 2719 igmp6_group_dropped(i);
63ed8de4 2720 mutex_unlock(&idev->mc_lock);
1da177e4 2721
2d9a93b4
TY		 2722 /* Should stop work after group drop. or we will
2723 * start work again in mld_ifc_event()
1666d49e 2724 */
f185de28
TY		 2725 synchronize_net();
2726 mld_query_stop_work(idev);
2727 mld_report_stop_work(idev);
2d9a93b4
TY		 2728 mld_ifc_stop_work(idev);
2729 mld_gq_stop_work(idev);
2730 mld_dad_stop_work(idev);
1da177e4
LT		 2731}
2732
2f711939
HFS		 2733static void ipv6_mc_reset(struct inet6_dev *idev)
2734{
2735 idev->mc_qrv = sysctl_mld_qrv;
2736 idev->mc_qi = MLD_QI_DEFAULT;
2737 idev->mc_qri = MLD_QRI_DEFAULT;
2738 idev->mc_v1_seen = 0;
2739 idev->mc_maxdelay = unsolicited_report_interval(idev);
2740}
1da177e4
LT		 2741
2742/* Device going up */
2743
2744void ipv6_mc_up(struct inet6_dev *idev)
2745{
2746 struct ifmcaddr6 *i;
2747
2748 /* Install multicast list, except for all-nodes (already installed) */
2749
2f711939 2750 ipv6_mc_reset(idev);
63ed8de4
TY		 2751 mutex_lock(&idev->mc_lock);
2752 for_each_mc_mclock(idev, i) {
1666d49e 2753 mld_del_delrec(idev, i);
0ae0d60a 2754 igmp6_group_added(i);
1666d49e 2755 }
63ed8de4 2756 mutex_unlock(&idev->mc_lock);
1da177e4
LT		 2757}
2758
2759/* IPv6 device initialization. */
2760
2761void ipv6_mc_init_dev(struct inet6_dev *idev)
2762{
1da177e4 2763 idev->mc_gq_running = 0;
2d9a93b4 2764 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work);
88e2ca30 2765 RCU_INIT_POINTER(idev->mc_tomb, NULL);
1da177e4 2766 idev->mc_ifc_count = 0;
2d9a93b4
TY		 2767 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work);
2768 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work);
f185de28
TY		 2769 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work);
2770 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work);
2771 skb_queue_head_init(&idev->mc_query_queue);
2772 skb_queue_head_init(&idev->mc_report_queue);
2773 spin_lock_init(&idev->mc_query_lock);
2774 spin_lock_init(&idev->mc_report_lock);
63ed8de4 2775 mutex_init(&idev->mc_lock);
2f711939 2776 ipv6_mc_reset(idev);
1da177e4
LT		 2777}
2778
2779/*
2780 * Device is about to be destroyed: clean up.
2781 */
2782
2783void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2784{
2785 struct ifmcaddr6 *i;
1da177e4 2786
2d9a93b4 2787 /* Deactivate works */
1da177e4 2788 ipv6_mc_down(idev);
63ed8de4 2789 mutex_lock(&idev->mc_lock);
1666d49e 2790 mld_clear_delrec(idev);
63ed8de4 2791 mutex_unlock(&idev->mc_lock);
f185de28
TY		 2792 mld_clear_query(idev);
2793 mld_clear_report(idev);
1da177e4
LT		 2794
2795 /* Delete all-nodes address. */
1da177e4
LT		 2796 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2797 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2798 * fail.
2799 */
f3ee4010 2800 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2801
f3ee4010
YH		 2802 if (idev->cnf.forwarding)
2803 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4 2804
63ed8de4
TY		 2805 mutex_lock(&idev->mc_lock);
2806 while ((i = mc_dereference(idev->mc_list, idev))) {
2807 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev));
1da177e4 2808
ea2fce88 2809 ip6_mc_clear_src(i);
1da177e4 2810 ma_put(i);
1da177e4 2811 }
63ed8de4 2812 mutex_unlock(&idev->mc_lock);
1da177e4
LT		 2813}
2814
382ed724
VY		 2815static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2816{
2817 struct ifmcaddr6 *pmc;
2818
2819 ASSERT_RTNL();
2820
63ed8de4 2821 mutex_lock(&idev->mc_lock);
382ed724 2822 if (mld_in_v1_mode(idev)) {
63ed8de4 2823 for_each_mc_mclock(idev, pmc)
382ed724 2824 igmp6_join_group(pmc);
88e2ca30 2825 } else {
382ed724 2826 mld_send_report(idev, NULL);
88e2ca30 2827 }
63ed8de4 2828 mutex_unlock(&idev->mc_lock);
382ed724
VY		 2829}
2830
2831static int ipv6_mc_netdev_event(struct notifier_block *this,
2832 unsigned long event,
2833 void *ptr)
2834{
2835 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2836 struct inet6_dev *idev = __in6_dev_get(dev);
2837
2838 switch (event) {
2839 case NETDEV_RESEND_IGMP:
2840 if (idev)
2841 ipv6_mc_rejoin_groups(idev);
2842 break;
2843 default:
2844 break;
2845 }
2846
2847 return NOTIFY_DONE;
2848}
2849
2850static struct notifier_block igmp6_netdev_notifier = {
2851 .notifier_call = ipv6_mc_netdev_event,
2852};
2853
1da177e4
LT		 2854#ifdef CONFIG_PROC_FS
2855struct igmp6_mc_iter_state {
b8ad0cbc 2856 struct seq_net_private p;
1da177e4
LT		 2857 struct net_device *dev;
2858 struct inet6_dev *idev;
2859};
2860
2861#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2862
2863static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2864{
2865 struct ifmcaddr6 *im = NULL;
2866 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2867 struct net *net = seq_file_net(seq);
1da177e4 2868
7562f876 2869 state->idev = NULL;
ce81b76a 2870 for_each_netdev_rcu(net, state->dev) {
1da177e4 2871 struct inet6_dev *idev;
ce81b76a 2872 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2873 if (!idev)
2874 continue;
88e2ca30
TY		 2875
2876 im = rcu_dereference(idev->mc_list);
1da177e4
LT		 2877 if (im) {
2878 state->idev = idev;
2879 break;
2880 }
1da177e4
LT		 2881 }
2882 return im;
2883}
2884
2885static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2886{
2887 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2888
88e2ca30 2889 im = rcu_dereference(im->next);
1da177e4 2890 while (!im) {
ce81b76a 2891 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2892 if (!state->dev) {
2893 state->idev = NULL;
2894 break;
2895 }
ce81b76a 2896 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2897 if (!state->idev)
2898 continue;
88e2ca30 2899 im = rcu_dereference(state->idev->mc_list);
1da177e4
LT		 2900 }
2901 return im;
2902}
2903
2904static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2905{
2906 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2907 if (im)
2908 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2909 --pos;
2910 return pos ? NULL : im;
2911}
2912
2913static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2914 __acquires(RCU)
1da177e4 2915{
ce81b76a 2916 rcu_read_lock();
1da177e4
LT		 2917 return igmp6_mc_get_idx(seq, *pos);
2918}
2919
2920static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2921{
ce81b76a
ED		 2922 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2923
1da177e4
LT		 2924 ++*pos;
2925 return im;
2926}
2927
2928static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2929 __releases(RCU)
1da177e4
LT		 2930{
2931 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2932
88e2ca30 2933 if (likely(state->idev))
1da177e4 2934 state->idev = NULL;
1da177e4 2935 state->dev = NULL;
ce81b76a 2936 rcu_read_unlock();
1da177e4
LT		 2937}
2938
2939static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2940{
2941 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2942 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2943
2944 seq_printf(seq,
4b7a4274 2945 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2946 state->dev->ifindex, state->dev->name,
b071195d 2947 &im->mca_addr,
1da177e4 2948 im->mca_users, im->mca_flags,
88e2ca30 2949 (im->mca_flags & MAF_TIMER_RUNNING) ?
2d9a93b4 2950 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0);
1da177e4
LT		 2951 return 0;
2952}
2953
56b3d975 2954static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2955 .start = igmp6_mc_seq_start,
2956 .next = igmp6_mc_seq_next,
2957 .stop = igmp6_mc_seq_stop,
2958 .show = igmp6_mc_seq_show,
2959};
2960
1da177e4 2961struct igmp6_mcf_iter_state {
b8ad0cbc 2962 struct seq_net_private p;
1da177e4
LT		 2963 struct net_device *dev;
2964 struct inet6_dev *idev;
2965 struct ifmcaddr6 *im;
2966};
2967
2968#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2969
2970static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2971{
2972 struct ip6_sf_list *psf = NULL;
2973 struct ifmcaddr6 *im = NULL;
2974 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2975 struct net *net = seq_file_net(seq);
1da177e4 2976
7562f876
PE		 2977 state->idev = NULL;
2978 state->im = NULL;
ce81b76a 2979 for_each_netdev_rcu(net, state->dev) {
1da177e4 2980 struct inet6_dev *idev;
ce81b76a 2981 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2982 if (unlikely(idev == NULL))
2983 continue;
88e2ca30
TY		 2984
2985 im = rcu_dereference(idev->mc_list);
53b24b8f 2986 if (likely(im)) {
4b200e39 2987 psf = rcu_dereference(im->mca_sources);
53b24b8f 2988 if (likely(psf)) {
1da177e4
LT		 2989 state->im = im;
2990 state->idev = idev;
2991 break;
2992 }
1da177e4 2993 }
1da177e4
LT		 2994 }
2995 return psf;
2996}
2997
2998static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2999{
3000 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3001
4b200e39 3002 psf = rcu_dereference(psf->sf_next);
1da177e4 3003 while (!psf) {
88e2ca30 3004 state->im = rcu_dereference(state->im->next);
1da177e4 3005 while (!state->im) {
ce81b76a 3006 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 3007 if (!state->dev) {
3008 state->idev = NULL;
3009 goto out;
3010 }
ce81b76a 3011 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 3012 if (!state->idev)
3013 continue;
88e2ca30 3014 state->im = rcu_dereference(state->idev->mc_list);
1da177e4
LT		 3015 }
3016 if (!state->im)
3017 break;
4b200e39 3018 psf = rcu_dereference(state->im->mca_sources);
1da177e4
LT		 3019 }
3020out:
3021 return psf;
3022}
3023
3024static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
3025{
3026 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
3027 if (psf)
3028 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
3029 --pos;
3030 return pos ? NULL : psf;
3031}
3032
3033static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 3034 __acquires(RCU)
1da177e4 3035{
ce81b76a 3036 rcu_read_lock();
1da177e4
LT		 3037 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3038}
3039
3040static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3041{
3042 struct ip6_sf_list *psf;
3043 if (v == SEQ_START_TOKEN)
3044 psf = igmp6_mcf_get_first(seq);
3045 else
3046 psf = igmp6_mcf_get_next(seq, v);
3047 ++*pos;
3048 return psf;
3049}
3050
3051static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 3052 __releases(RCU)
1da177e4
LT		 3053{
3054 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
88e2ca30 3055
f185de28 3056 if (likely(state->im))
1da177e4 3057 state->im = NULL;
88e2ca30 3058 if (likely(state->idev))
1da177e4 3059 state->idev = NULL;
88e2ca30 3060
1da177e4 3061 state->dev = NULL;
ce81b76a 3062 rcu_read_unlock();
1da177e4
LT		 3063}
3064
3065static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
3066{
3067 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
3068 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3069
3070 if (v == SEQ_START_TOKEN) {
1744bea1 3071 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
1da177e4
LT		 3072 } else {
3073 seq_printf(seq,
4b7a4274 3074 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 3075 state->dev->ifindex, state->dev->name,
b071195d
HH		 3076 &state->im->mca_addr,
3077 &psf->sf_addr,
1da177e4
LT		 3078 psf->sf_count[MCAST_INCLUDE],
3079 psf->sf_count[MCAST_EXCLUDE]);
3080 }
3081 return 0;
3082}
3083
56b3d975 3084static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 3085 .start = igmp6_mcf_seq_start,
3086 .next = igmp6_mcf_seq_next,
3087 .stop = igmp6_mcf_seq_stop,
3088 .show = igmp6_mcf_seq_show,
3089};
3090
2c8c1e72 3091static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL		 3092{
3093 int err;
3094
3095 err = -ENOMEM;
c3506372
CH		 3096 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
3097 sizeof(struct igmp6_mc_iter_state)))
ea82edf7 3098 goto out;
c3506372
CH		 3099 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
3100 &igmp6_mcf_seq_ops,
3101 sizeof(struct igmp6_mcf_iter_state)))
ea82edf7
DL		 3102 goto out_proc_net_igmp6;
3103
3104 err = 0;
3105out:
3106 return err;
3107
3108out_proc_net_igmp6:
ece31ffd 3109 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL		 3110 goto out;
3111}
3112
2c8c1e72 3113static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7 3114{
ece31ffd
G		 3115 remove_proc_entry("mcfilter6", net->proc_net);
3116 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL		 3117}
3118#else
2c8c1e72 3119static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL		 3120{
3121 return 0;
3122}
2c8c1e72 3123static inline void igmp6_proc_exit(struct net *net)
ea82edf7 3124{
ea82edf7 3125}
1da177e4
LT		 3126#endif
3127
2c8c1e72 3128static int __net_init igmp6_net_init(struct net *net)
1da177e4 3129{
1da177e4
LT		 3130 int err;
3131
1ed8516f
DL		 3132 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
3133 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4 3134 if (err < 0) {
f3213831 3135 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
1da177e4 3136 err);
b8ad0cbc 3137 goto out;
1da177e4
LT		 3138 }
3139
1ed8516f 3140 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
f185de28 3141 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL;
1da177e4 3142
93a714d6
MC		 3143 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
3144 SOCK_RAW, IPPROTO_ICMPV6, net);
3145 if (err < 0) {
3146 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
3147 err);
3148 goto out_sock_create;
3149 }
3150
ea82edf7
DL		 3151 err = igmp6_proc_init(net);
3152 if (err)
93a714d6
MC		 3153 goto out_sock_create_autojoin;
3154
3155 return 0;
b8ad0cbc 3156
93a714d6
MC		 3157out_sock_create_autojoin:
3158 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
b8ad0cbc 3159out_sock_create:
1ed8516f 3160 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
93a714d6
MC		 3161out:
3162 return err;
1da177e4
LT		 3163}
3164
2c8c1e72 3165static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 3166{
1ed8516f 3167 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
93a714d6 3168 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
ea82edf7 3169 igmp6_proc_exit(net);
1da177e4 3170}
b8ad0cbc
DL		 3171
3172static struct pernet_operations igmp6_net_ops = {
3173 .init = igmp6_net_init,
3174 .exit = igmp6_net_exit,
3175};
3176
3177int __init igmp6_init(void)
3178{
2d9a93b4
TY		 3179 int err;
3180
3181 err = register_pernet_subsys(&igmp6_net_ops);
3182 if (err)
3183 return err;
3184
3185 mld_wq = create_workqueue("mld");
3186 if (!mld_wq) {
3187 unregister_pernet_subsys(&igmp6_net_ops);
3188 return -ENOMEM;
3189 }
3190
3191 return err;
b8ad0cbc
DL		 3192}
3193
382ed724
VY		 3194int __init igmp6_late_init(void)
3195{
3196 return register_netdevice_notifier(&igmp6_netdev_notifier);
3197}
3198
b8ad0cbc
DL		 3199void igmp6_cleanup(void)
3200{
3201 unregister_pernet_subsys(&igmp6_net_ops);
2d9a93b4 3202 destroy_workqueue(mld_wq);
b8ad0cbc 3203}
382ed724
VY		 3204
3205void igmp6_late_cleanup(void)
3206{
3207 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3208}
Linux 6.x block layer and io_uring tree(s)