projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
tcp: better comments for RTO initiallization
[linux-block.git] / net / ipv6 / mcast.c
CommitLineData
1da177e4
LT		 1/*
2 * Multicast support for IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1ab1457c 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
1da177e4
LT		 9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16/* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
1da177e4
LT		 29#include <linux/module.h>
30#include <linux/errno.h>
31#include <linux/types.h>
32#include <linux/string.h>
33#include <linux/socket.h>
34#include <linux/sockios.h>
35#include <linux/jiffies.h>
36#include <linux/times.h>
37#include <linux/net.h>
38#include <linux/in.h>
39#include <linux/in6.h>
40#include <linux/netdevice.h>
41#include <linux/if_arp.h>
42#include <linux/route.h>
43#include <linux/init.h>
44#include <linux/proc_fs.h>
45#include <linux/seq_file.h>
5a0e3ad6 46#include <linux/slab.h>
9d4a0314 47#include <linux/pkt_sched.h>
6e7cb837 48#include <net/mld.h>
1da177e4
LT		 49
50#include <linux/netfilter.h>
51#include <linux/netfilter_ipv6.h>
52
457c4cbc 53#include <net/net_namespace.h>
1da177e4
LT		 54#include <net/sock.h>
55#include <net/snmp.h>
56
57#include <net/ipv6.h>
58#include <net/protocol.h>
59#include <net/if_inet6.h>
60#include <net/ndisc.h>
61#include <net/addrconf.h>
62#include <net/ip6_route.h>
1ed8516f 63#include <net/inet_common.h>
1da177e4
LT		 64
65#include <net/ip6_checksum.h>
66
67/* Set to 3 to get tracing... */
68#define MCAST_DEBUG 2
69
70#if MCAST_DEBUG >= 3
71#define MDBG(x) printk x
72#else
73#define MDBG(x)
74#endif
75
6e7cb837
YH		 76/* Ensure that we have struct in6_addr aligned on 32bit word. */
77static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
78 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
79 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
80 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
1da177e4
LT		 81};
82
83static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
84
85/* Big mc list lock for all the sockets */
456b61bc 86static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
1da177e4 87
1da177e4
LT		 88static void igmp6_join_group(struct ifmcaddr6 *ma);
89static void igmp6_leave_group(struct ifmcaddr6 *ma);
90static void igmp6_timer_handler(unsigned long data);
91
92static void mld_gq_timer_expire(unsigned long data);
93static void mld_ifc_timer_expire(unsigned long data);
94static void mld_ifc_event(struct inet6_dev *idev);
95static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
b71d1d42 96static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
1da177e4
LT		 97static void mld_clear_delrec(struct inet6_dev *idev);
98static int sf_setstate(struct ifmcaddr6 *pmc);
99static void sf_markstate(struct ifmcaddr6 *pmc);
100static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
b71d1d42
ED		 101static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
102 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4 103 int delta);
b71d1d42
ED		 104static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
105 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 106 int delta);
107static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
108 struct inet6_dev *idev);
109
1da177e4
LT		 110#define MLD_QRV_DEFAULT 2
111
9fd07841
DB		 112/* RFC3810, 8.1 Query Version Distinctions */
113#define MLD_V1_QUERY_LEN 24
114#define MLD_V2_QUERY_LEN_MIN 28
115
53b7997f 116#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
1da177e4
LT		 117 (idev)->cnf.force_mld_version == 1 || \
118 ((idev)->mc_v1_seen && \
119 time_before(jiffies, (idev)->mc_v1_seen)))
120
6f4353d8 121#define IPV6_MLD_MAX_MSF 64
1da177e4 122
ab32ea5d 123int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 124
125/*
126 * socket join on multicast group
127 */
128
456b61bc
ED		 129#define for_each_pmc_rcu(np, pmc) \
130 for (pmc = rcu_dereference(np->ipv6_mc_list); \
131 pmc != NULL; \
132 pmc = rcu_dereference(pmc->next))
133
fc4eba58
HFS		 134static int unsolicited_report_interval(struct inet6_dev *idev)
135{
136 int iv;
137
138 if (MLD_V1_SEEN(idev))
139 iv = idev->cnf.mldv1_unsolicited_report_interval;
140 else
141 iv = idev->cnf.mldv2_unsolicited_report_interval;
142
143 return iv > 0 ? iv : 1;
144}
145
9acd9f3a 146int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 147{
148 struct net_device *dev = NULL;
149 struct ipv6_mc_socklist *mc_lst;
150 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 151 struct net *net = sock_net(sk);
1da177e4
LT		 152 int err;
153
154 if (!ipv6_addr_is_multicast(addr))
155 return -EINVAL;
156
456b61bc
ED		 157 rcu_read_lock();
158 for_each_pmc_rcu(np, mc_lst) {
c9e3e8b6
DS		 159 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
160 ipv6_addr_equal(&mc_lst->addr, addr)) {
456b61bc 161 rcu_read_unlock();
c9e3e8b6
DS		 162 return -EADDRINUSE;
163 }
164 }
456b61bc 165 rcu_read_unlock();
c9e3e8b6 166
1da177e4
LT		 167 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
168
169 if (mc_lst == NULL)
170 return -ENOMEM;
171
172 mc_lst->next = NULL;
4e3fd7a0 173 mc_lst->addr = *addr;
1da177e4 174
96b52e61 175 rcu_read_lock();
1da177e4
LT		 176 if (ifindex == 0) {
177 struct rt6_info *rt;
b8ad0cbc 178 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4 179 if (rt) {
d1918542 180 dev = rt->dst.dev;
94e187c0 181 ip6_rt_put(rt);
1da177e4
LT		 182 }
183 } else
96b52e61 184 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT		 185
186 if (dev == NULL) {
96b52e61 187 rcu_read_unlock();
1da177e4
LT		 188 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
189 return -ENODEV;
190 }
191
192 mc_lst->ifindex = dev->ifindex;
193 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 194 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 195 mc_lst->sflist = NULL;
196
197 /*
198 * now add/increase the group membership on the device
199 */
200
201 err = ipv6_dev_mc_inc(dev, addr);
202
203 if (err) {
96b52e61 204 rcu_read_unlock();
1da177e4 205 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
1da177e4
LT		 206 return err;
207 }
208
456b61bc 209 spin_lock(&ipv6_sk_mc_lock);
1da177e4 210 mc_lst->next = np->ipv6_mc_list;
456b61bc
ED		 211 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
212 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 213
96b52e61 214 rcu_read_unlock();
1da177e4
LT		 215
216 return 0;
217}
218
219/*
220 * socket leave on multicast group
221 */
9acd9f3a 222int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 223{
224 struct ipv6_pinfo *np = inet6_sk(sk);
456b61bc
ED		 225 struct ipv6_mc_socklist *mc_lst;
226 struct ipv6_mc_socklist __rcu **lnk;
3b1e0a65 227 struct net *net = sock_net(sk);
1da177e4 228
a858d64b
LW		 229 if (!ipv6_addr_is_multicast(addr))
230 return -EINVAL;
231
456b61bc
ED		 232 spin_lock(&ipv6_sk_mc_lock);
233 for (lnk = &np->ipv6_mc_list;
234 (mc_lst = rcu_dereference_protected(*lnk,
235 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
236 lnk = &mc_lst->next) {
1da177e4
LT		 237 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
238 ipv6_addr_equal(&mc_lst->addr, addr)) {
239 struct net_device *dev;
240
241 *lnk = mc_lst->next;
456b61bc 242 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 243
96b52e61
ED		 244 rcu_read_lock();
245 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
b8ad0cbc 246 if (dev != NULL) {
96b52e61 247 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 248
acd6e00b 249 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 250 if (idev)
1da177e4 251 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 252 } else
253 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
96b52e61 254 rcu_read_unlock();
456b61bc 255 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 256 kfree_rcu(mc_lst, rcu);
1da177e4
LT		 257 return 0;
258 }
259 }
456b61bc 260 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 261
9951f036 262 return -EADDRNOTAVAIL;
1da177e4
LT		 263}
264
96b52e61
ED		 265/* called with rcu_read_lock() */
266static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
b71d1d42 267 const struct in6_addr *group,
96b52e61 268 int ifindex)
1da177e4
LT		 269{
270 struct net_device *dev = NULL;
271 struct inet6_dev *idev = NULL;
272
273 if (ifindex == 0) {
96b52e61 274 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4 275
1da177e4 276 if (rt) {
d1918542 277 dev = rt->dst.dev;
94e187c0 278 ip6_rt_put(rt);
1da177e4
LT		 279 }
280 } else
96b52e61 281 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT		 282
283 if (!dev)
96b52e61
ED		 284 return NULL;
285 idev = __in6_dev_get(dev);
448eb71f 286 if (!idev)
8a22c99a 287 return NULL;
1da177e4 288 read_lock_bh(&idev->lock);
96b52e61
ED		 289 if (idev->dead) {
290 read_unlock_bh(&idev->lock);
291 return NULL;
292 }
1da177e4
LT		 293 return idev;
294}
295
296void ipv6_sock_mc_close(struct sock *sk)
297{
298 struct ipv6_pinfo *np = inet6_sk(sk);
299 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 300 struct net *net = sock_net(sk);
1da177e4 301
0e1efe9d
ED		 302 if (!rcu_access_pointer(np->ipv6_mc_list))
303 return;
304
456b61bc
ED		 305 spin_lock(&ipv6_sk_mc_lock);
306 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
307 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
1da177e4
LT		 308 struct net_device *dev;
309
310 np->ipv6_mc_list = mc_lst->next;
456b61bc 311 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 312
96b52e61
ED		 313 rcu_read_lock();
314 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
1da177e4 315 if (dev) {
96b52e61 316 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 317
acd6e00b 318 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 319 if (idev)
1da177e4 320 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 321 } else
322 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
96b52e61 323 rcu_read_unlock();
1da177e4 324
456b61bc 325 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 326 kfree_rcu(mc_lst, rcu);
456b61bc
ED		 327
328 spin_lock(&ipv6_sk_mc_lock);
1da177e4 329 }
456b61bc 330 spin_unlock(&ipv6_sk_mc_lock);
1da177e4
LT		 331}
332
333int ip6_mc_source(int add, int omode, struct sock *sk,
334 struct group_source_req *pgsr)
335{
336 struct in6_addr *source, *group;
337 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 338 struct inet6_dev *idev;
339 struct ipv6_pinfo *inet6 = inet6_sk(sk);
340 struct ip6_sf_socklist *psl;
3b1e0a65 341 struct net *net = sock_net(sk);
1da177e4 342 int i, j, rv;
c9e3e8b6 343 int leavegroup = 0;
5ab4a6c8 344 int pmclocked = 0;
1da177e4
LT		 345 int err;
346
1da177e4
LT		 347 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
348 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
349
350 if (!ipv6_addr_is_multicast(group))
351 return -EINVAL;
352
96b52e61
ED		 353 rcu_read_lock();
354 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
355 if (!idev) {
356 rcu_read_unlock();
1da177e4 357 return -ENODEV;
96b52e61 358 }
1da177e4
LT		 359
360 err = -EADDRNOTAVAIL;
361
456b61bc 362 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 363 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
364 continue;
365 if (ipv6_addr_equal(&pmc->addr, group))
366 break;
367 }
917f2f10
DS		 368 if (!pmc) { /* must have a prior join */
369 err = -EINVAL;
1da177e4 370 goto done;
917f2f10 371 }
1da177e4
LT		 372 /* if a source filter was set, must be the same mode as before */
373 if (pmc->sflist) {
917f2f10
DS		 374 if (pmc->sfmode != omode) {
375 err = -EINVAL;
1da177e4 376 goto done;
917f2f10 377 }
1da177e4
LT		 378 } else if (pmc->sfmode != omode) {
379 /* allow mode switches for empty-set filters */
380 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
381 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
382 pmc->sfmode = omode;
383 }
384
96b52e61 385 write_lock(&pmc->sflock);
5ab4a6c8
DS		 386 pmclocked = 1;
387
1da177e4
LT		 388 psl = pmc->sflist;
389 if (!add) {
390 if (!psl)
917f2f10 391 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 392 rv = !0;
393 for (i=0; i<psl->sl_count; i++) {
07c2fecc 394 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
1da177e4
LT		 395 if (rv == 0)
396 break;
397 }
398 if (rv) /* source not found */
917f2f10 399 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 400
c9e3e8b6
DS		 401 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
402 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
403 leavegroup = 1;
404 goto done;
405 }
406
1da177e4
LT		 407 /* update the interface filter */
408 ip6_mc_del_src(idev, group, omode, 1, source, 1);
409
410 for (j=i+1; j<psl->sl_count; j++)
411 psl->sl_addr[j-1] = psl->sl_addr[j];
412 psl->sl_count--;
413 err = 0;
414 goto done;
415 }
416 /* else, add a new source to the filter */
417
418 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
419 err = -ENOBUFS;
420 goto done;
421 }
422 if (!psl || psl->sl_count == psl->sl_max) {
423 struct ip6_sf_socklist *newpsl;
424 int count = IP6_SFBLOCK;
425
426 if (psl)
427 count += psl->sl_max;
8b3a7005 428 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 429 if (!newpsl) {
430 err = -ENOBUFS;
431 goto done;
432 }
433 newpsl->sl_max = count;
434 newpsl->sl_count = count - IP6_SFBLOCK;
435 if (psl) {
436 for (i=0; i<psl->sl_count; i++)
437 newpsl->sl_addr[i] = psl->sl_addr[i];
438 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
439 }
440 pmc->sflist = psl = newpsl;
441 }
442 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
443 for (i=0; i<psl->sl_count; i++) {
07c2fecc 444 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
56db1c5f
JS		 445 if (rv == 0) /* There is an error in the address. */
446 goto done;
1da177e4 447 }
1da177e4
LT		 448 for (j=psl->sl_count-1; j>=i; j--)
449 psl->sl_addr[j+1] = psl->sl_addr[j];
450 psl->sl_addr[i] = *source;
451 psl->sl_count++;
452 err = 0;
453 /* update the interface list */
454 ip6_mc_add_src(idev, group, omode, 1, source, 1);
455done:
5ab4a6c8 456 if (pmclocked)
96b52e61 457 write_unlock(&pmc->sflock);
1da177e4 458 read_unlock_bh(&idev->lock);
96b52e61 459 rcu_read_unlock();
c9e3e8b6
DS		 460 if (leavegroup)
461 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 462 return err;
463}
464
465int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
466{
b71d1d42 467 const struct in6_addr *group;
1da177e4 468 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 469 struct inet6_dev *idev;
470 struct ipv6_pinfo *inet6 = inet6_sk(sk);
471 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 472 struct net *net = sock_net(sk);
9951f036 473 int leavegroup = 0;
1da177e4
LT		 474 int i, err;
475
476 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
477
478 if (!ipv6_addr_is_multicast(group))
479 return -EINVAL;
480 if (gsf->gf_fmode != MCAST_INCLUDE &&
481 gsf->gf_fmode != MCAST_EXCLUDE)
482 return -EINVAL;
483
96b52e61
ED		 484 rcu_read_lock();
485 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 486
96b52e61
ED		 487 if (!idev) {
488 rcu_read_unlock();
1da177e4 489 return -ENODEV;
96b52e61 490 }
1da177e4 491
9c05989b 492 err = 0;
5ab4a6c8 493
9951f036
DS		 494 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
495 leavegroup = 1;
496 goto done;
497 }
498
456b61bc 499 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 500 if (pmc->ifindex != gsf->gf_interface)
501 continue;
502 if (ipv6_addr_equal(&pmc->addr, group))
503 break;
504 }
917f2f10
DS		 505 if (!pmc) { /* must have a prior join */
506 err = -EINVAL;
1da177e4 507 goto done;
917f2f10 508 }
1da177e4 509 if (gsf->gf_numsrc) {
8b3a7005
KK		 510 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
511 GFP_ATOMIC);
1da177e4
LT		 512 if (!newpsl) {
513 err = -ENOBUFS;
514 goto done;
515 }
516 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
517 for (i=0; i<newpsl->sl_count; ++i) {
518 struct sockaddr_in6 *psin6;
519
520 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
521 newpsl->sl_addr[i] = psin6->sin6_addr;
522 }
523 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
524 newpsl->sl_count, newpsl->sl_addr, 0);
525 if (err) {
526 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
527 goto done;
528 }
8713dbf0 529 } else {
1da177e4 530 newpsl = NULL;
8713dbf0
YZ		 531 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
532 }
5ab4a6c8 533
96b52e61 534 write_lock(&pmc->sflock);
1da177e4
LT		 535 psl = pmc->sflist;
536 if (psl) {
537 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
538 psl->sl_count, psl->sl_addr, 0);
539 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
540 } else
541 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
542 pmc->sflist = newpsl;
543 pmc->sfmode = gsf->gf_fmode;
96b52e61 544 write_unlock(&pmc->sflock);
917f2f10 545 err = 0;
1da177e4
LT		 546done:
547 read_unlock_bh(&idev->lock);
96b52e61 548 rcu_read_unlock();
9951f036
DS		 549 if (leavegroup)
550 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 551 return err;
552}
553
554int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
555 struct group_filter __user *optval, int __user *optlen)
556{
557 int err, i, count, copycount;
b71d1d42 558 const struct in6_addr *group;
1da177e4
LT		 559 struct ipv6_mc_socklist *pmc;
560 struct inet6_dev *idev;
1da177e4
LT		 561 struct ipv6_pinfo *inet6 = inet6_sk(sk);
562 struct ip6_sf_socklist *psl;
3b1e0a65 563 struct net *net = sock_net(sk);
1da177e4
LT		 564
565 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
566
567 if (!ipv6_addr_is_multicast(group))
568 return -EINVAL;
569
96b52e61
ED		 570 rcu_read_lock();
571 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 572
96b52e61
ED		 573 if (!idev) {
574 rcu_read_unlock();
1da177e4 575 return -ENODEV;
96b52e61 576 }
1da177e4
LT		 577
578 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 579 /*
580 * changes to the ipv6_mc_list require the socket lock and
581 * a read lock on ip6_sk_mc_lock. We have the socket lock,
582 * so reading the list is safe.
583 */
1da177e4 584
456b61bc 585 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 586 if (pmc->ifindex != gsf->gf_interface)
587 continue;
588 if (ipv6_addr_equal(group, &pmc->addr))
589 break;
590 }
591 if (!pmc) /* must have a prior join */
592 goto done;
593 gsf->gf_fmode = pmc->sfmode;
594 psl = pmc->sflist;
595 count = psl ? psl->sl_count : 0;
596 read_unlock_bh(&idev->lock);
96b52e61 597 rcu_read_unlock();
1da177e4
LT		 598
599 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
600 gsf->gf_numsrc = count;
601 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
602 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
603 return -EFAULT;
604 }
5ab4a6c8
DS		 605 /* changes to psl require the socket lock, a read lock on
606 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
607 * have the socket lock, so reading here is safe.
608 */
1da177e4
LT		 609 for (i=0; i<copycount; i++) {
610 struct sockaddr_in6 *psin6;
611 struct sockaddr_storage ss;
612
613 psin6 = (struct sockaddr_in6 *)&ss;
614 memset(&ss, 0, sizeof(ss));
615 psin6->sin6_family = AF_INET6;
616 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 617 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 618 return -EFAULT;
619 }
620 return 0;
621done:
622 read_unlock_bh(&idev->lock);
96b52e61 623 rcu_read_unlock();
1da177e4
LT		 624 return err;
625}
626
a50feda5
ED		 627bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
628 const struct in6_addr *src_addr)
1da177e4
LT		 629{
630 struct ipv6_pinfo *np = inet6_sk(sk);
631 struct ipv6_mc_socklist *mc;
632 struct ip6_sf_socklist *psl;
a50feda5 633 bool rv = true;
1da177e4 634
456b61bc
ED		 635 rcu_read_lock();
636 for_each_pmc_rcu(np, mc) {
1da177e4
LT		 637 if (ipv6_addr_equal(&mc->addr, mc_addr))
638 break;
639 }
640 if (!mc) {
456b61bc 641 rcu_read_unlock();
a50feda5 642 return true;
1da177e4 643 }
5ab4a6c8 644 read_lock(&mc->sflock);
1da177e4
LT		 645 psl = mc->sflist;
646 if (!psl) {
647 rv = mc->sfmode == MCAST_EXCLUDE;
648 } else {
649 int i;
650
651 for (i=0; i<psl->sl_count; i++) {
652 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
653 break;
654 }
655 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
a50feda5 656 rv = false;
1da177e4 657 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
a50feda5 658 rv = false;
1da177e4 659 }
5ab4a6c8 660 read_unlock(&mc->sflock);
456b61bc 661 rcu_read_unlock();
1da177e4
LT		 662
663 return rv;
664}
665
666static void ma_put(struct ifmcaddr6 *mc)
667{
668 if (atomic_dec_and_test(&mc->mca_refcnt)) {
669 in6_dev_put(mc->idev);
670 kfree(mc);
671 }
672}
673
674static void igmp6_group_added(struct ifmcaddr6 *mc)
675{
676 struct net_device *dev = mc->idev->dev;
677 char buf[MAX_ADDR_LEN];
678
ec16ef22
YH		 679 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
680 IPV6_ADDR_SCOPE_LINKLOCAL)
681 return;
682
1da177e4
LT		 683 spin_lock_bh(&mc->mca_lock);
684 if (!(mc->mca_flags&MAF_LOADED)) {
685 mc->mca_flags |= MAF_LOADED;
686 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 687 dev_mc_add(dev, buf);
1da177e4
LT		 688 }
689 spin_unlock_bh(&mc->mca_lock);
690
691 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
692 return;
693
694 if (MLD_V1_SEEN(mc->idev)) {
695 igmp6_join_group(mc);
696 return;
697 }
698 /* else v2 */
699
700 mc->mca_crcount = mc->idev->mc_qrv;
701 mld_ifc_event(mc->idev);
702}
703
704static void igmp6_group_dropped(struct ifmcaddr6 *mc)
705{
706 struct net_device *dev = mc->idev->dev;
707 char buf[MAX_ADDR_LEN];
708
ec16ef22
YH		 709 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
710 IPV6_ADDR_SCOPE_LINKLOCAL)
711 return;
712
1da177e4
LT		 713 spin_lock_bh(&mc->mca_lock);
714 if (mc->mca_flags&MAF_LOADED) {
715 mc->mca_flags &= ~MAF_LOADED;
716 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 717 dev_mc_del(dev, buf);
1da177e4
LT		 718 }
719
720 if (mc->mca_flags & MAF_NOREPORT)
721 goto done;
722 spin_unlock_bh(&mc->mca_lock);
723
724 if (!mc->idev->dead)
725 igmp6_leave_group(mc);
726
727 spin_lock_bh(&mc->mca_lock);
728 if (del_timer(&mc->mca_timer))
729 atomic_dec(&mc->mca_refcnt);
730done:
731 ip6_mc_clear_src(mc);
732 spin_unlock_bh(&mc->mca_lock);
733}
734
735/*
736 * deleted ifmcaddr6 manipulation
737 */
738static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
739{
740 struct ifmcaddr6 *pmc;
741
742 /* this is an "ifmcaddr6" for convenience; only the fields below
743 * are actually used. In particular, the refcnt and users are not
744 * used for management of the delete list. Using the same structure
745 * for deleted items allows change reports to use common code with
746 * non-deleted or query-response MCA's.
747 */
0c600eda 748 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 749 if (!pmc)
750 return;
0c600eda 751
1da177e4
LT		 752 spin_lock_bh(&im->mca_lock);
753 spin_lock_init(&pmc->mca_lock);
754 pmc->idev = im->idev;
755 in6_dev_hold(idev);
756 pmc->mca_addr = im->mca_addr;
757 pmc->mca_crcount = idev->mc_qrv;
758 pmc->mca_sfmode = im->mca_sfmode;
759 if (pmc->mca_sfmode == MCAST_INCLUDE) {
760 struct ip6_sf_list *psf;
761
762 pmc->mca_tomb = im->mca_tomb;
763 pmc->mca_sources = im->mca_sources;
764 im->mca_tomb = im->mca_sources = NULL;
765 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
766 psf->sf_crcount = pmc->mca_crcount;
767 }
768 spin_unlock_bh(&im->mca_lock);
769
6457d26b 770 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 771 pmc->next = idev->mc_tomb;
772 idev->mc_tomb = pmc;
6457d26b 773 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 774}
775
b71d1d42 776static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
1da177e4
LT		 777{
778 struct ifmcaddr6 *pmc, *pmc_prev;
779 struct ip6_sf_list *psf, *psf_next;
780
6457d26b 781 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 782 pmc_prev = NULL;
783 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
784 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
785 break;
786 pmc_prev = pmc;
787 }
788 if (pmc) {
789 if (pmc_prev)
790 pmc_prev->next = pmc->next;
791 else
792 idev->mc_tomb = pmc->next;
793 }
6457d26b
SH		 794 spin_unlock_bh(&idev->mc_lock);
795
1da177e4
LT		 796 if (pmc) {
797 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
798 psf_next = psf->sf_next;
799 kfree(psf);
800 }
801 in6_dev_put(pmc->idev);
802 kfree(pmc);
803 }
804}
805
806static void mld_clear_delrec(struct inet6_dev *idev)
807{
808 struct ifmcaddr6 *pmc, *nextpmc;
809
6457d26b 810 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 811 pmc = idev->mc_tomb;
812 idev->mc_tomb = NULL;
6457d26b 813 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 814
815 for (; pmc; pmc = nextpmc) {
816 nextpmc = pmc->next;
817 ip6_mc_clear_src(pmc);
818 in6_dev_put(pmc->idev);
819 kfree(pmc);
820 }
821
822 /* clear dead sources, too */
823 read_lock_bh(&idev->lock);
824 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
825 struct ip6_sf_list *psf, *psf_next;
826
827 spin_lock_bh(&pmc->mca_lock);
828 psf = pmc->mca_tomb;
829 pmc->mca_tomb = NULL;
830 spin_unlock_bh(&pmc->mca_lock);
831 for (; psf; psf=psf_next) {
832 psf_next = psf->sf_next;
833 kfree(psf);
834 }
835 }
836 read_unlock_bh(&idev->lock);
837}
838
839
840/*
841 * device multicast group inc (add if not found)
842 */
9acd9f3a 843int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 844{
845 struct ifmcaddr6 *mc;
846 struct inet6_dev *idev;
847
96b52e61 848 /* we need to take a reference on idev */
1da177e4
LT		 849 idev = in6_dev_get(dev);
850
851 if (idev == NULL)
852 return -EINVAL;
853
854 write_lock_bh(&idev->lock);
855 if (idev->dead) {
856 write_unlock_bh(&idev->lock);
857 in6_dev_put(idev);
858 return -ENODEV;
859 }
860
861 for (mc = idev->mc_list; mc; mc = mc->next) {
862 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
863 mc->mca_users++;
864 write_unlock_bh(&idev->lock);
865 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
866 NULL, 0);
867 in6_dev_put(idev);
868 return 0;
869 }
870 }
871
872 /*
873 * not found: create a new one.
874 */
875
0c600eda 876 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 877
878 if (mc == NULL) {
879 write_unlock_bh(&idev->lock);
880 in6_dev_put(idev);
881 return -ENOMEM;
882 }
883
b24b8a24 884 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4 885
4e3fd7a0 886 mc->mca_addr = *addr;
96b52e61 887 mc->idev = idev; /* (reference taken) */
1da177e4
LT		 888 mc->mca_users = 1;
889 /* mca_stamp should be updated upon changes */
890 mc->mca_cstamp = mc->mca_tstamp = jiffies;
891 atomic_set(&mc->mca_refcnt, 2);
892 spin_lock_init(&mc->mca_lock);
893
894 /* initial mode is (EX, empty) */
895 mc->mca_sfmode = MCAST_EXCLUDE;
896 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
897
898 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
899 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
900 mc->mca_flags |= MAF_NOREPORT;
901
902 mc->next = idev->mc_list;
903 idev->mc_list = mc;
904 write_unlock_bh(&idev->lock);
905
906 mld_del_delrec(idev, &mc->mca_addr);
907 igmp6_group_added(mc);
908 ma_put(mc);
909 return 0;
910}
911
912/*
913 * device multicast group del
914 */
9acd9f3a 915int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 916{
917 struct ifmcaddr6 *ma, **map;
918
919 write_lock_bh(&idev->lock);
920 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
921 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
922 if (--ma->mca_users == 0) {
923 *map = ma->next;
924 write_unlock_bh(&idev->lock);
925
926 igmp6_group_dropped(ma);
927
928 ma_put(ma);
929 return 0;
930 }
931 write_unlock_bh(&idev->lock);
932 return 0;
933 }
934 }
935 write_unlock_bh(&idev->lock);
936
937 return -ENOENT;
938}
939
9acd9f3a 940int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4 941{
96b52e61 942 struct inet6_dev *idev;
1da177e4
LT		 943 int err;
944
96b52e61 945 rcu_read_lock();
1da177e4 946
96b52e61
ED		 947 idev = __in6_dev_get(dev);
948 if (!idev)
949 err = -ENODEV;
950 else
951 err = __ipv6_dev_mc_dec(idev, addr);
1da177e4 952
96b52e61 953 rcu_read_unlock();
1da177e4
LT		 954 return err;
955}
956
1da177e4
LT		 957/*
958 * check if the interface/address pair is valid
959 */
a50feda5
ED		 960bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
961 const struct in6_addr *src_addr)
1da177e4
LT		 962{
963 struct inet6_dev *idev;
964 struct ifmcaddr6 *mc;
a50feda5 965 bool rv = false;
1da177e4 966
96b52e61
ED		 967 rcu_read_lock();
968 idev = __in6_dev_get(dev);
1da177e4
LT		 969 if (idev) {
970 read_lock_bh(&idev->lock);
971 for (mc = idev->mc_list; mc; mc=mc->next) {
972 if (ipv6_addr_equal(&mc->mca_addr, group))
973 break;
974 }
975 if (mc) {
976 if (src_addr && !ipv6_addr_any(src_addr)) {
977 struct ip6_sf_list *psf;
978
979 spin_lock_bh(&mc->mca_lock);
980 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
981 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
982 break;
983 }
984 if (psf)
985 rv = psf->sf_count[MCAST_INCLUDE] ||
986 psf->sf_count[MCAST_EXCLUDE] !=
987 mc->mca_sfcount[MCAST_EXCLUDE];
988 else
989 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
990 spin_unlock_bh(&mc->mca_lock);
991 } else
a50feda5 992 rv = true; /* don't filter unspecified source */
1da177e4
LT		 993 }
994 read_unlock_bh(&idev->lock);
1da177e4 995 }
96b52e61 996 rcu_read_unlock();
1da177e4
LT		 997 return rv;
998}
999
1000static void mld_gq_start_timer(struct inet6_dev *idev)
1001{
c2cef4e8 1002 unsigned long tv = net_random() % idev->mc_maxdelay;
1da177e4
LT		 1003
1004 idev->mc_gq_running = 1;
1005 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1006 in6_dev_hold(idev);
1007}
1008
c2cef4e8 1009static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1da177e4 1010{
c2cef4e8 1011 unsigned long tv = net_random() % delay;
1da177e4
LT		 1012
1013 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1014 in6_dev_hold(idev);
1015}
1016
c2cef4e8 1017static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
b173ee48 1018{
c2cef4e8 1019 unsigned long tv = net_random() % delay;
b173ee48
HFS		 1020
1021 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1022 in6_dev_hold(idev);
1023}
1024
1da177e4
LT		 1025/*
1026 * IGMP handling (alias multicast ICMPv6 messages)
1027 */
1028
1029static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1030{
1031 unsigned long delay = resptime;
1032
1033 /* Do not start timer for these addresses */
1034 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1035 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1036 return;
1037
1038 if (del_timer(&ma->mca_timer)) {
1039 atomic_dec(&ma->mca_refcnt);
1040 delay = ma->mca_timer.expires - jiffies;
1041 }
1042
1043 if (delay >= resptime) {
1044 if (resptime)
1045 delay = net_random() % resptime;
1046 else
1047 delay = 1;
1048 }
1049 ma->mca_timer.expires = jiffies + delay;
1050 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1051 atomic_inc(&ma->mca_refcnt);
1052 ma->mca_flags |= MAF_TIMER_RUNNING;
1053}
1054
5ab4a6c8 1055/* mark EXCLUDE-mode sources */
a50feda5
ED		 1056static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1057 const struct in6_addr *srcs)
1da177e4
LT		 1058{
1059 struct ip6_sf_list *psf;
1060 int i, scount;
1061
1062 scount = 0;
1063 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1064 if (scount == nsrcs)
1065 break;
5ab4a6c8
DS		 1066 for (i=0; i<nsrcs; i++) {
1067 /* skip inactive filters */
e05c4ad3 1068 if (psf->sf_count[MCAST_INCLUDE] ||
5ab4a6c8
DS		 1069 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1070 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 1071 break;
5ab4a6c8
DS		 1072 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1073 scount++;
1074 break;
1075 }
1076 }
1077 }
1078 pmc->mca_flags &= ~MAF_GSQUERY;
1079 if (scount == nsrcs) /* all sources excluded */
a50feda5
ED		 1080 return false;
1081 return true;
5ab4a6c8
DS		 1082}
1083
a50feda5
ED		 1084static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1085 const struct in6_addr *srcs)
5ab4a6c8
DS		 1086{
1087 struct ip6_sf_list *psf;
1088 int i, scount;
1089
1090 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1091 return mld_xmarksources(pmc, nsrcs, srcs);
1092
1093 /* mark INCLUDE-mode sources */
1094
1095 scount = 0;
1096 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1097 if (scount == nsrcs)
1098 break;
1099 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1100 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1101 psf->sf_gsresp = 1;
1102 scount++;
1103 break;
1104 }
5ab4a6c8
DS		 1105 }
1106 }
1107 if (!scount) {
1108 pmc->mca_flags &= ~MAF_GSQUERY;
a50feda5 1109 return false;
1da177e4 1110 }
5ab4a6c8 1111 pmc->mca_flags |= MAF_GSQUERY;
a50feda5 1112 return true;
1da177e4
LT		 1113}
1114
96b52e61 1115/* called with rcu_read_lock() */
1da177e4
LT		 1116int igmp6_event_query(struct sk_buff *skb)
1117{
97300b5f 1118 struct mld2_query *mlh2 = NULL;
1da177e4 1119 struct ifmcaddr6 *ma;
b71d1d42 1120 const struct in6_addr *group;
1da177e4
LT		 1121 unsigned long max_delay;
1122 struct inet6_dev *idev;
6e7cb837 1123 struct mld_msg *mld;
1da177e4
LT		 1124 int group_type;
1125 int mark = 0;
1126 int len;
1127
1128 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1129 return -EINVAL;
1130
1131 /* compute payload length excluding extension headers */
0660e03f 1132 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1133 len -= skb_network_header_len(skb);
1da177e4
LT		 1134
1135 /* Drop queries with not link local source */
0660e03f 1136 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1137 return -EINVAL;
1138
96b52e61 1139 idev = __in6_dev_get(skb->dev);
1da177e4
LT		 1140
1141 if (idev == NULL)
1142 return 0;
1143
6e7cb837
YH		 1144 mld = (struct mld_msg *)icmp6_hdr(skb);
1145 group = &mld->mld_mca;
1da177e4
LT		 1146 group_type = ipv6_addr_type(group);
1147
1148 if (group_type != IPV6_ADDR_ANY &&
96b52e61 1149 !(group_type&IPV6_ADDR_MULTICAST))
1da177e4 1150 return -EINVAL;
1da177e4 1151
9fd07841 1152 if (len == MLD_V1_QUERY_LEN) {
1da177e4
LT		 1153 int switchback;
1154 /* MLDv1 router present */
1155
84698963 1156 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1da177e4
LT		 1157 switchback = (idev->mc_qrv + 1) * max_delay;
1158 idev->mc_v1_seen = jiffies + switchback;
1159
1160 /* cancel the interface change timer */
1161 idev->mc_ifc_count = 0;
1162 if (del_timer(&idev->mc_ifc_timer))
1163 __in6_dev_put(idev);
1164 /* clear deleted report items */
1165 mld_clear_delrec(idev);
9fd07841 1166 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1ab1457c 1167 int srcs_offset = sizeof(struct mld2_query) -
97300b5f 1168 sizeof(struct icmp6hdr);
96b52e61 1169 if (!pskb_may_pull(skb, srcs_offset))
97300b5f 1170 return -EINVAL;
96b52e61 1171
9c70220b 1172 mlh2 = (struct mld2_query *)skb_transport_header(skb);
84698963
DB		 1173
1174 max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mlh2->mld2q_mrc))), 1UL);
1175
1da177e4 1176 idev->mc_maxdelay = max_delay;
84698963 1177
6e7cb837
YH		 1178 if (mlh2->mld2q_qrv)
1179 idev->mc_qrv = mlh2->mld2q_qrv;
1da177e4 1180 if (group_type == IPV6_ADDR_ANY) { /* general query */
96b52e61 1181 if (mlh2->mld2q_nsrcs)
1da177e4 1182 return -EINVAL; /* no sources allowed */
96b52e61 1183
1da177e4 1184 mld_gq_start_timer(idev);
1da177e4
LT		 1185 return 0;
1186 }
1187 /* mark sources to include, if group & source-specific */
6e7cb837 1188 if (mlh2->mld2q_nsrcs != 0) {
1ab1457c 1189 if (!pskb_may_pull(skb, srcs_offset +
96b52e61 1190 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
97300b5f 1191 return -EINVAL;
96b52e61 1192
9c70220b 1193 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1194 mark = 1;
1195 }
96b52e61 1196 } else
1da177e4 1197 return -EINVAL;
1da177e4
LT		 1198
1199 read_lock_bh(&idev->lock);
1200 if (group_type == IPV6_ADDR_ANY) {
1201 for (ma = idev->mc_list; ma; ma=ma->next) {
1202 spin_lock_bh(&ma->mca_lock);
1203 igmp6_group_queried(ma, max_delay);
1204 spin_unlock_bh(&ma->mca_lock);
1205 }
1206 } else {
1207 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1208 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1209 continue;
1210 spin_lock_bh(&ma->mca_lock);
1211 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1212 /* gsquery <- gsquery && mark */
1213 if (!mark)
1214 ma->mca_flags &= ~MAF_GSQUERY;
1215 } else {
1216 /* gsquery <- mark */
1217 if (mark)
1218 ma->mca_flags |= MAF_GSQUERY;
1219 else
1220 ma->mca_flags &= ~MAF_GSQUERY;
1221 }
5ab4a6c8 1222 if (!(ma->mca_flags & MAF_GSQUERY) ||
6e7cb837 1223 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
5ab4a6c8 1224 igmp6_group_queried(ma, max_delay);
1da177e4 1225 spin_unlock_bh(&ma->mca_lock);
7add2a43 1226 break;
1da177e4
LT		 1227 }
1228 }
1229 read_unlock_bh(&idev->lock);
1da177e4
LT		 1230
1231 return 0;
1232}
1233
96b52e61 1234/* called with rcu_read_lock() */
1da177e4
LT		 1235int igmp6_event_report(struct sk_buff *skb)
1236{
1237 struct ifmcaddr6 *ma;
1da177e4 1238 struct inet6_dev *idev;
6e7cb837 1239 struct mld_msg *mld;
1da177e4
LT		 1240 int addr_type;
1241
1242 /* Our own report looped back. Ignore it. */
1243 if (skb->pkt_type == PACKET_LOOPBACK)
1244 return 0;
1245
24c69275
DS		 1246 /* send our report if the MC router may not have heard this report */
1247 if (skb->pkt_type != PACKET_MULTICAST &&
1248 skb->pkt_type != PACKET_BROADCAST)
1249 return 0;
1250
6e7cb837 1251 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1da177e4
LT		 1252 return -EINVAL;
1253
6e7cb837 1254 mld = (struct mld_msg *)icmp6_hdr(skb);
1da177e4
LT		 1255
1256 /* Drop reports with not link local source */
0660e03f 1257 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1258 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1259 !(addr_type&IPV6_ADDR_LINKLOCAL))
1260 return -EINVAL;
1261
96b52e61 1262 idev = __in6_dev_get(skb->dev);
1da177e4
LT		 1263 if (idev == NULL)
1264 return -ENODEV;
1265
1266 /*
1267 * Cancel the timer for this group
1268 */
1269
1270 read_lock_bh(&idev->lock);
1271 for (ma = idev->mc_list; ma; ma=ma->next) {
6e7cb837 1272 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1da177e4
LT		 1273 spin_lock(&ma->mca_lock);
1274 if (del_timer(&ma->mca_timer))
1275 atomic_dec(&ma->mca_refcnt);
1276 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1277 spin_unlock(&ma->mca_lock);
1278 break;
1279 }
1280 }
1281 read_unlock_bh(&idev->lock);
1da177e4
LT		 1282 return 0;
1283}
1284
a50feda5
ED		 1285static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1286 int gdeleted, int sdeleted)
1da177e4
LT		 1287{
1288 switch (type) {
1289 case MLD2_MODE_IS_INCLUDE:
1290 case MLD2_MODE_IS_EXCLUDE:
1291 if (gdeleted || sdeleted)
a50feda5 1292 return false;
5ab4a6c8
DS		 1293 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1294 if (pmc->mca_sfmode == MCAST_INCLUDE)
a50feda5 1295 return true;
5ab4a6c8
DS		 1296 /* don't include if this source is excluded
1297 * in all filters
1298 */
1299 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1300 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1301 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1302 psf->sf_count[MCAST_EXCLUDE];
1303 }
a50feda5 1304 return false;
1da177e4
LT		 1305 case MLD2_CHANGE_TO_INCLUDE:
1306 if (gdeleted || sdeleted)
a50feda5 1307 return false;
1da177e4
LT		 1308 return psf->sf_count[MCAST_INCLUDE] != 0;
1309 case MLD2_CHANGE_TO_EXCLUDE:
1310 if (gdeleted || sdeleted)
a50feda5 1311 return false;
1da177e4
LT		 1312 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1313 psf->sf_count[MCAST_INCLUDE])
a50feda5 1314 return false;
1da177e4
LT		 1315 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1316 psf->sf_count[MCAST_EXCLUDE];
1317 case MLD2_ALLOW_NEW_SOURCES:
1318 if (gdeleted || !psf->sf_crcount)
a50feda5 1319 return false;
1da177e4
LT		 1320 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1321 case MLD2_BLOCK_OLD_SOURCES:
1322 if (pmc->mca_sfmode == MCAST_INCLUDE)
1323 return gdeleted || (psf->sf_crcount && sdeleted);
1324 return psf->sf_crcount && !gdeleted && !sdeleted;
1325 }
a50feda5 1326 return false;
1da177e4
LT		 1327}
1328
1329static int
1330mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1331{
1332 struct ip6_sf_list *psf;
1333 int scount = 0;
1334
1335 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1336 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1337 continue;
1338 scount++;
1339 }
1340 return scount;
1341}
1342
2576f17d
YH		 1343static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1344 struct net_device *dev,
1345 const struct in6_addr *saddr,
1346 const struct in6_addr *daddr,
1347 int proto, int len)
1348{
1349 struct ipv6hdr *hdr;
1350
1351 skb->protocol = htons(ETH_P_IPV6);
1352 skb->dev = dev;
1353
1354 skb_reset_network_header(skb);
1355 skb_put(skb, sizeof(struct ipv6hdr));
1356 hdr = ipv6_hdr(skb);
1357
1358 ip6_flow_hdr(hdr, 0, 0);
1359
1360 hdr->payload_len = htons(len);
1361 hdr->nexthdr = proto;
1362 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1363
1364 hdr->saddr = *saddr;
1365 hdr->daddr = *daddr;
1366}
1367
8965779d 1368static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1da177e4 1369{
8965779d 1370 struct net_device *dev = idev->dev;
c346dca1 1371 struct net *net = dev_net(dev);
b8ad0cbc 1372 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1373 struct sk_buff *skb;
1374 struct mld2_report *pmr;
1375 struct in6_addr addr_buf;
d7aabf22 1376 const struct in6_addr *saddr;
a7ae1992
HX		 1377 int hlen = LL_RESERVED_SPACE(dev);
1378 int tlen = dev->needed_tailroom;
1da177e4
LT		 1379 int err;
1380 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1381 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1382 IPV6_TLV_PADN, 0 };
1383
1384 /* we assume size > sizeof(ra) here */
a7ae1992 1385 size += hlen + tlen;
72e09ad1
ED		 1386 /* limit our allocations to order-0 page */
1387 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1388 skb = sock_alloc_send_skb(sk, size, 1, &err);
1da177e4 1389
cfcabdcc 1390 if (!skb)
1da177e4
LT		 1391 return NULL;
1392
9d4a0314 1393 skb->priority = TC_PRIO_CONTROL;
a7ae1992 1394 skb_reserve(skb, hlen);
1da177e4 1395
8965779d 1396 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1397 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1398 * use unspecified address as the source address
1da177e4
LT		 1399 * when a valid link-local address is not available.
1400 */
d7aabf22
YH		 1401 saddr = &in6addr_any;
1402 } else
1403 saddr = &addr_buf;
1da177e4 1404
2576f17d 1405 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4
LT		 1406
1407 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1408
27a884dc 1409 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1410 skb_put(skb, sizeof(*pmr));
1411 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837
YH		 1412 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1413 pmr->mld2r_resv1 = 0;
1414 pmr->mld2r_cksum = 0;
1415 pmr->mld2r_resv2 = 0;
1416 pmr->mld2r_ngrec = 0;
1da177e4
LT		 1417 return skb;
1418}
1419
1420static void mld_sendpack(struct sk_buff *skb)
1421{
0660e03f 1422 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1423 struct mld2_report *pmr =
1424 (struct mld2_report *)skb_transport_header(skb);
1da177e4 1425 int payload_len, mldlen;
96b52e61 1426 struct inet6_dev *idev;
c346dca1 1427 struct net *net = dev_net(skb->dev);
1da177e4 1428 int err;
4c9483b2 1429 struct flowi6 fl6;
adf30907 1430 struct dst_entry *dst;
1da177e4 1431
96b52e61
ED		 1432 rcu_read_lock();
1433 idev = __in6_dev_get(skb->dev);
edf391ff
NH		 1434 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1435
29a3cad5
SH		 1436 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1437 sizeof(*pip6);
1438 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1da177e4
LT		 1439 pip6->payload_len = htons(payload_len);
1440
6e7cb837
YH		 1441 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1442 IPPROTO_ICMPV6,
1443 csum_partial(skb_transport_header(skb),
1444 mldlen, 0));
41927178 1445
4c9483b2 1446 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
41927178
YH		 1447 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1448 skb->dev->ifindex);
12fd84f4 1449 dst = icmp6_dst_alloc(skb->dev, &fl6);
41927178 1450
452edd59
DM		 1451 err = 0;
1452 if (IS_ERR(dst)) {
1453 err = PTR_ERR(dst);
1454 dst = NULL;
1455 }
adf30907 1456 skb_dst_set(skb, dst);
41927178
YH		 1457 if (err)
1458 goto err_out;
1459
edf391ff
NH		 1460 payload_len = skb->len;
1461
b2e0b385 1462 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1463 dst_output);
1464out:
1da177e4 1465 if (!err) {
5a57d4c7 1466 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
e41b5368 1467 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1468 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1da177e4 1469 } else
483a47d2 1470 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 1471
96b52e61 1472 rcu_read_unlock();
41927178
YH		 1473 return;
1474
1475err_out:
1476 kfree_skb(skb);
1477 goto out;
1da177e4
LT		 1478}
1479
1480static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1481{
fab10fe3 1482 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1483}
1484
1485static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1486 int type, struct mld2_grec **ppgr)
1487{
1488 struct net_device *dev = pmc->idev->dev;
1489 struct mld2_report *pmr;
1490 struct mld2_grec *pgr;
1491
1492 if (!skb)
8965779d 1493 skb = mld_newpack(pmc->idev, dev->mtu);
1da177e4
LT		 1494 if (!skb)
1495 return NULL;
1496 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1497 pgr->grec_type = type;
1498 pgr->grec_auxwords = 0;
1499 pgr->grec_nsrcs = 0;
1500 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1501 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837 1502 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1da177e4
LT		 1503 *ppgr = pgr;
1504 return skb;
1505}
1506
1507#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1508 skb_tailroom(skb)) : 0)
1509
1510static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1511 int type, int gdeleted, int sdeleted)
1512{
8965779d
AW		 1513 struct inet6_dev *idev = pmc->idev;
1514 struct net_device *dev = idev->dev;
1da177e4
LT		 1515 struct mld2_report *pmr;
1516 struct mld2_grec *pgr = NULL;
1517 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1518 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1519
1520 if (pmc->mca_flags & MAF_NOREPORT)
1521 return skb;
1522
1523 isquery = type == MLD2_MODE_IS_INCLUDE ||
1524 type == MLD2_MODE_IS_EXCLUDE;
1525 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1526 type == MLD2_CHANGE_TO_EXCLUDE;
1527
5ab4a6c8
DS		 1528 stotal = scount = 0;
1529
1da177e4
LT		 1530 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1531
5ab4a6c8
DS		 1532 if (!*psf_list)
1533 goto empty_source;
1534
9c70220b 1535 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1536
1537 /* EX and TO_EX get a fresh packet, if needed */
1538 if (truncate) {
6e7cb837 1539 if (pmr && pmr->mld2r_ngrec &&
1da177e4
LT		 1540 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1541 if (skb)
1542 mld_sendpack(skb);
8965779d 1543 skb = mld_newpack(idev, dev->mtu);
1da177e4
LT		 1544 }
1545 }
1546 first = 1;
1da177e4
LT		 1547 psf_prev = NULL;
1548 for (psf=*psf_list; psf; psf=psf_next) {
1549 struct in6_addr *psrc;
1550
1551 psf_next = psf->sf_next;
1552
1553 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1554 psf_prev = psf;
1555 continue;
1556 }
1557
1558 /* clear marks on query responses */
1559 if (isquery)
1560 psf->sf_gsresp = 0;
1561
1562 if (AVAILABLE(skb) < sizeof(*psrc) +
1563 first*sizeof(struct mld2_grec)) {
1564 if (truncate && !first)
1565 break; /* truncate these */
1566 if (pgr)
1567 pgr->grec_nsrcs = htons(scount);
1568 if (skb)
1569 mld_sendpack(skb);
8965779d 1570 skb = mld_newpack(idev, dev->mtu);
1da177e4
LT		 1571 first = 1;
1572 scount = 0;
1573 }
1574 if (first) {
1575 skb = add_grhead(skb, pmc, type, &pgr);
1576 first = 0;
1577 }
cc63f70b
AD		 1578 if (!skb)
1579 return NULL;
1da177e4
LT		 1580 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1581 *psrc = psf->sf_addr;
5ab4a6c8 1582 scount++; stotal++;
1da177e4
LT		 1583 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1584 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1585 psf->sf_crcount--;
1586 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1587 if (psf_prev)
1588 psf_prev->sf_next = psf->sf_next;
1589 else
1590 *psf_list = psf->sf_next;
1591 kfree(psf);
1592 continue;
1593 }
1594 }
1595 psf_prev = psf;
1596 }
5ab4a6c8
DS		 1597
1598empty_source:
1599 if (!stotal) {
1600 if (type == MLD2_ALLOW_NEW_SOURCES ||
1601 type == MLD2_BLOCK_OLD_SOURCES)
1602 return skb;
1603 if (pmc->mca_crcount || isquery) {
1604 /* make sure we have room for group header */
1605 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1606 mld_sendpack(skb);
1607 skb = NULL; /* add_grhead will get a new one */
1608 }
1609 skb = add_grhead(skb, pmc, type, &pgr);
1610 }
1611 }
1da177e4
LT		 1612 if (pgr)
1613 pgr->grec_nsrcs = htons(scount);
1614
1615 if (isquery)
1616 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1617 return skb;
1618}
1619
1620static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1621{
1622 struct sk_buff *skb = NULL;
1623 int type;
1624
8965779d 1625 read_lock_bh(&idev->lock);
1da177e4 1626 if (!pmc) {
1da177e4
LT		 1627 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1628 if (pmc->mca_flags & MAF_NOREPORT)
1629 continue;
1630 spin_lock_bh(&pmc->mca_lock);
1631 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1632 type = MLD2_MODE_IS_EXCLUDE;
1633 else
1634 type = MLD2_MODE_IS_INCLUDE;
1635 skb = add_grec(skb, pmc, type, 0, 0);
1636 spin_unlock_bh(&pmc->mca_lock);
1637 }
1da177e4
LT		 1638 } else {
1639 spin_lock_bh(&pmc->mca_lock);
1640 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1641 type = MLD2_MODE_IS_EXCLUDE;
1642 else
1643 type = MLD2_MODE_IS_INCLUDE;
1644 skb = add_grec(skb, pmc, type, 0, 0);
1645 spin_unlock_bh(&pmc->mca_lock);
1646 }
8965779d 1647 read_unlock_bh(&idev->lock);
1da177e4
LT		 1648 if (skb)
1649 mld_sendpack(skb);
1650}
1651
1652/*
1653 * remove zero-count source records from a source filter list
1654 */
1655static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1656{
1657 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1658
1659 psf_prev = NULL;
1660 for (psf=*ppsf; psf; psf = psf_next) {
1661 psf_next = psf->sf_next;
1662 if (psf->sf_crcount == 0) {
1663 if (psf_prev)
1664 psf_prev->sf_next = psf->sf_next;
1665 else
1666 *ppsf = psf->sf_next;
1667 kfree(psf);
1668 } else
1669 psf_prev = psf;
1670 }
1671}
1672
1673static void mld_send_cr(struct inet6_dev *idev)
1674{
1675 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1676 struct sk_buff *skb = NULL;
1677 int type, dtype;
1678
1679 read_lock_bh(&idev->lock);
6457d26b 1680 spin_lock(&idev->mc_lock);
1da177e4
LT		 1681
1682 /* deleted MCA's */
1683 pmc_prev = NULL;
1684 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1685 pmc_next = pmc->next;
1686 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1687 type = MLD2_BLOCK_OLD_SOURCES;
1688 dtype = MLD2_BLOCK_OLD_SOURCES;
1689 skb = add_grec(skb, pmc, type, 1, 0);
1690 skb = add_grec(skb, pmc, dtype, 1, 1);
1691 }
1692 if (pmc->mca_crcount) {
1da177e4
LT		 1693 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1694 type = MLD2_CHANGE_TO_INCLUDE;
1695 skb = add_grec(skb, pmc, type, 1, 0);
1696 }
5ab4a6c8 1697 pmc->mca_crcount--;
1da177e4
LT		 1698 if (pmc->mca_crcount == 0) {
1699 mld_clear_zeros(&pmc->mca_tomb);
1700 mld_clear_zeros(&pmc->mca_sources);
1701 }
1702 }
1703 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1704 !pmc->mca_sources) {
1705 if (pmc_prev)
1706 pmc_prev->next = pmc_next;
1707 else
1708 idev->mc_tomb = pmc_next;
1709 in6_dev_put(pmc->idev);
1710 kfree(pmc);
1711 } else
1712 pmc_prev = pmc;
1713 }
6457d26b 1714 spin_unlock(&idev->mc_lock);
1da177e4
LT		 1715
1716 /* change recs */
1717 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1718 spin_lock_bh(&pmc->mca_lock);
1719 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1720 type = MLD2_BLOCK_OLD_SOURCES;
1721 dtype = MLD2_ALLOW_NEW_SOURCES;
1722 } else {
1723 type = MLD2_ALLOW_NEW_SOURCES;
1724 dtype = MLD2_BLOCK_OLD_SOURCES;
1725 }
1726 skb = add_grec(skb, pmc, type, 0, 0);
1727 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1728
1729 /* filter mode changes */
1730 if (pmc->mca_crcount) {
1da177e4
LT		 1731 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1732 type = MLD2_CHANGE_TO_EXCLUDE;
1733 else
1734 type = MLD2_CHANGE_TO_INCLUDE;
1735 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1736 pmc->mca_crcount--;
1da177e4
LT		 1737 }
1738 spin_unlock_bh(&pmc->mca_lock);
1739 }
1740 read_unlock_bh(&idev->lock);
1741 if (!skb)
1742 return;
1743 (void) mld_sendpack(skb);
1744}
1745
1746static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1747{
c346dca1 1748 struct net *net = dev_net(dev);
b8ad0cbc 1749 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1750 struct inet6_dev *idev;
1ab1457c 1751 struct sk_buff *skb;
6e7cb837 1752 struct mld_msg *hdr;
d7aabf22 1753 const struct in6_addr *snd_addr, *saddr;
1da177e4 1754 struct in6_addr addr_buf;
a7ae1992
HX		 1755 int hlen = LL_RESERVED_SPACE(dev);
1756 int tlen = dev->needed_tailroom;
1da177e4
LT		 1757 int err, len, payload_len, full_len;
1758 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1759 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1760 IPV6_TLV_PADN, 0 };
4c9483b2 1761 struct flowi6 fl6;
adf30907 1762 struct dst_entry *dst;
1da177e4 1763
f3ee4010
YH		 1764 if (type == ICMPV6_MGM_REDUCTION)
1765 snd_addr = &in6addr_linklocal_allrouters;
1766 else
1767 snd_addr = addr;
1da177e4
LT		 1768
1769 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1770 payload_len = len + sizeof(ra);
1771 full_len = sizeof(struct ipv6hdr) + payload_len;
1772
edf391ff
NH		 1773 rcu_read_lock();
1774 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1775 IPSTATS_MIB_OUT, full_len);
1776 rcu_read_unlock();
1777
a7ae1992 1778 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1da177e4
LT		 1779
1780 if (skb == NULL) {
a11d206d 1781 rcu_read_lock();
3bd653c8 1782 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH		 1783 IPSTATS_MIB_OUTDISCARDS);
1784 rcu_read_unlock();
1da177e4
LT		 1785 return;
1786 }
9d4a0314 1787 skb->priority = TC_PRIO_CONTROL;
a7ae1992 1788 skb_reserve(skb, hlen);
1da177e4 1789
95c385b4 1790 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1791 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1792 * use unspecified address as the source address
1da177e4
LT		 1793 * when a valid link-local address is not available.
1794 */
d7aabf22
YH		 1795 saddr = &in6addr_any;
1796 } else
1797 saddr = &addr_buf;
1da177e4 1798
2576f17d 1799 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4
LT		 1800
1801 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1802
6e7cb837
YH		 1803 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1804 memset(hdr, 0, sizeof(struct mld_msg));
1805 hdr->mld_type = type;
4e3fd7a0 1806 hdr->mld_mca = *addr;
1da177e4 1807
6e7cb837
YH		 1808 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1809 IPPROTO_ICMPV6,
1810 csum_partial(hdr, len, 0));
1da177e4 1811
96b52e61
ED		 1812 rcu_read_lock();
1813 idev = __in6_dev_get(skb->dev);
1da177e4 1814
4c9483b2 1815 icmpv6_flow_init(sk, &fl6, type,
41927178
YH		 1816 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1817 skb->dev->ifindex);
12fd84f4 1818 dst = icmp6_dst_alloc(skb->dev, &fl6);
452edd59
DM		 1819 if (IS_ERR(dst)) {
1820 err = PTR_ERR(dst);
41927178 1821 goto err_out;
452edd59 1822 }
41927178 1823
adf30907 1824 skb_dst_set(skb, dst);
b2e0b385 1825 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1826 dst_output);
1827out:
1da177e4 1828 if (!err) {
5c5d244b 1829 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 1830 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1831 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1da177e4 1832 } else
3bd653c8 1833 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 1834
96b52e61 1835 rcu_read_unlock();
1da177e4 1836 return;
41927178
YH		 1837
1838err_out:
1839 kfree_skb(skb);
1840 goto out;
1da177e4
LT		 1841}
1842
b173ee48
HFS		 1843static void mld_resend_report(struct inet6_dev *idev)
1844{
1845 if (MLD_V1_SEEN(idev)) {
1846 struct ifmcaddr6 *mcaddr;
1847 read_lock_bh(&idev->lock);
1848 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1849 if (!(mcaddr->mca_flags & MAF_NOREPORT))
1850 igmp6_send(&mcaddr->mca_addr, idev->dev,
1851 ICMPV6_MGM_REPORT);
1852 }
1853 read_unlock_bh(&idev->lock);
1854 } else {
1855 mld_send_report(idev, NULL);
1856 }
1857}
1858
1859void ipv6_mc_dad_complete(struct inet6_dev *idev)
1860{
1861 idev->mc_dad_count = idev->mc_qrv;
1862 if (idev->mc_dad_count) {
1863 mld_resend_report(idev);
1864 idev->mc_dad_count--;
1865 if (idev->mc_dad_count)
1866 mld_dad_start_timer(idev, idev->mc_maxdelay);
1867 }
1868}
1869
1870static void mld_dad_timer_expire(unsigned long data)
1871{
1872 struct inet6_dev *idev = (struct inet6_dev *)data;
1873
1874 mld_resend_report(idev);
1875 if (idev->mc_dad_count) {
1876 idev->mc_dad_count--;
1877 if (idev->mc_dad_count)
1878 mld_dad_start_timer(idev, idev->mc_maxdelay);
1879 }
1880 __in6_dev_put(idev);
1881}
1882
1da177e4 1883static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
b71d1d42 1884 const struct in6_addr *psfsrc)
1da177e4
LT		 1885{
1886 struct ip6_sf_list *psf, *psf_prev;
1887 int rv = 0;
1888
1889 psf_prev = NULL;
1890 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1891 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1892 break;
1893 psf_prev = psf;
1894 }
1895 if (!psf || psf->sf_count[sfmode] == 0) {
1896 /* source filter not found, or count wrong => bug */
1897 return -ESRCH;
1898 }
1899 psf->sf_count[sfmode]--;
1900 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1901 struct inet6_dev *idev = pmc->idev;
1902
1903 /* no more filters for this source */
1904 if (psf_prev)
1905 psf_prev->sf_next = psf->sf_next;
1906 else
1907 pmc->mca_sources = psf->sf_next;
1908 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1909 !MLD_V1_SEEN(idev)) {
1910 psf->sf_crcount = idev->mc_qrv;
1911 psf->sf_next = pmc->mca_tomb;
1912 pmc->mca_tomb = psf;
1913 rv = 1;
1914 } else
1915 kfree(psf);
1916 }
1917 return rv;
1918}
1919
b71d1d42
ED		 1920static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1921 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 1922 int delta)
1923{
1924 struct ifmcaddr6 *pmc;
1925 int changerec = 0;
1926 int i, err;
1927
1928 if (!idev)
1929 return -ENODEV;
1930 read_lock_bh(&idev->lock);
1931 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1932 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1933 break;
1934 }
1935 if (!pmc) {
1936 /* MCA not found?? bug */
1937 read_unlock_bh(&idev->lock);
1938 return -ESRCH;
1939 }
1940 spin_lock_bh(&pmc->mca_lock);
1941 sf_markstate(pmc);
1942 if (!delta) {
1943 if (!pmc->mca_sfcount[sfmode]) {
1944 spin_unlock_bh(&pmc->mca_lock);
1945 read_unlock_bh(&idev->lock);
1946 return -EINVAL;
1947 }
1948 pmc->mca_sfcount[sfmode]--;
1949 }
1950 err = 0;
1951 for (i=0; i<sfcount; i++) {
1952 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1953
1954 changerec |= rv > 0;
1955 if (!err && rv < 0)
1956 err = rv;
1957 }
1958 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1959 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1960 pmc->mca_sfcount[MCAST_INCLUDE]) {
1961 struct ip6_sf_list *psf;
1962
1963 /* filter mode change */
1964 pmc->mca_sfmode = MCAST_INCLUDE;
1965 pmc->mca_crcount = idev->mc_qrv;
1966 idev->mc_ifc_count = pmc->mca_crcount;
1967 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1968 psf->sf_crcount = 0;
1969 mld_ifc_event(pmc->idev);
1970 } else if (sf_setstate(pmc) || changerec)
1971 mld_ifc_event(pmc->idev);
1972 spin_unlock_bh(&pmc->mca_lock);
1973 read_unlock_bh(&idev->lock);
1974 return err;
1975}
1976
1977/*
1978 * Add multicast single-source filter to the interface list
1979 */
1980static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
99d2f47a 1981 const struct in6_addr *psfsrc)
1da177e4
LT		 1982{
1983 struct ip6_sf_list *psf, *psf_prev;
1984
1985 psf_prev = NULL;
1986 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1987 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1988 break;
1989 psf_prev = psf;
1990 }
1991 if (!psf) {
0c600eda 1992 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1993 if (!psf)
1994 return -ENOBUFS;
0c600eda 1995
1da177e4
LT		 1996 psf->sf_addr = *psfsrc;
1997 if (psf_prev) {
1998 psf_prev->sf_next = psf;
1999 } else
2000 pmc->mca_sources = psf;
2001 }
2002 psf->sf_count[sfmode]++;
2003 return 0;
2004}
2005
2006static void sf_markstate(struct ifmcaddr6 *pmc)
2007{
2008 struct ip6_sf_list *psf;
2009 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2010
2011 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2012 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2013 psf->sf_oldin = mca_xcount ==
2014 psf->sf_count[MCAST_EXCLUDE] &&
2015 !psf->sf_count[MCAST_INCLUDE];
2016 } else
2017 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2018}
2019
2020static int sf_setstate(struct ifmcaddr6 *pmc)
2021{
7add2a43 2022 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 2023 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2024 int qrv = pmc->idev->mc_qrv;
2025 int new_in, rv;
2026
2027 rv = 0;
2028 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2029 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2030 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2031 !psf->sf_count[MCAST_INCLUDE];
2032 } else
2033 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 2034 if (new_in) {
2035 if (!psf->sf_oldin) {
e80e28b6 2036 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 2037
2038 for (dpsf=pmc->mca_tomb; dpsf;
2039 dpsf=dpsf->sf_next) {
2040 if (ipv6_addr_equal(&dpsf->sf_addr,
2041 &psf->sf_addr))
2042 break;
2043 prev = dpsf;
2044 }
2045 if (dpsf) {
2046 if (prev)
2047 prev->sf_next = dpsf->sf_next;
2048 else
2049 pmc->mca_tomb = dpsf->sf_next;
2050 kfree(dpsf);
2051 }
2052 psf->sf_crcount = qrv;
2053 rv++;
2054 }
2055 } else if (psf->sf_oldin) {
2056 psf->sf_crcount = 0;
2057 /*
2058 * add or update "delete" records if an active filter
2059 * is now inactive
2060 */
2061 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2062 if (ipv6_addr_equal(&dpsf->sf_addr,
2063 &psf->sf_addr))
2064 break;
2065 if (!dpsf) {
5d55354f 2066 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
7add2a43
DS		 2067 if (!dpsf)
2068 continue;
2069 *dpsf = *psf;
2070 /* pmc->mca_lock held by callers */
2071 dpsf->sf_next = pmc->mca_tomb;
2072 pmc->mca_tomb = dpsf;
2073 }
2074 dpsf->sf_crcount = qrv;
1da177e4
LT		 2075 rv++;
2076 }
2077 }
2078 return rv;
2079}
2080
2081/*
2082 * Add multicast source filter list to the interface list
2083 */
b71d1d42
ED		 2084static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2085 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 2086 int delta)
2087{
2088 struct ifmcaddr6 *pmc;
2089 int isexclude;
2090 int i, err;
2091
2092 if (!idev)
2093 return -ENODEV;
2094 read_lock_bh(&idev->lock);
2095 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2096 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2097 break;
2098 }
2099 if (!pmc) {
2100 /* MCA not found?? bug */
2101 read_unlock_bh(&idev->lock);
2102 return -ESRCH;
2103 }
2104 spin_lock_bh(&pmc->mca_lock);
2105
2106 sf_markstate(pmc);
2107 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2108 if (!delta)
2109 pmc->mca_sfcount[sfmode]++;
2110 err = 0;
2111 for (i=0; i<sfcount; i++) {
99d2f47a 2112 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT		 2113 if (err)
2114 break;
2115 }
2116 if (err) {
2117 int j;
2118
2119 if (!delta)
2120 pmc->mca_sfcount[sfmode]--;
2121 for (j=0; j<i; j++)
78d50217 2122 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4 2123 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT		 2124 struct ip6_sf_list *psf;
2125
2126 /* filter mode change */
2127 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2128 pmc->mca_sfmode = MCAST_EXCLUDE;
2129 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2130 pmc->mca_sfmode = MCAST_INCLUDE;
2131 /* else no filters; keep old mode for reports */
2132
2133 pmc->mca_crcount = idev->mc_qrv;
2134 idev->mc_ifc_count = pmc->mca_crcount;
2135 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2136 psf->sf_crcount = 0;
2137 mld_ifc_event(idev);
2138 } else if (sf_setstate(pmc))
2139 mld_ifc_event(idev);
2140 spin_unlock_bh(&pmc->mca_lock);
2141 read_unlock_bh(&idev->lock);
2142 return err;
2143}
2144
2145static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2146{
2147 struct ip6_sf_list *psf, *nextpsf;
2148
2149 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2150 nextpsf = psf->sf_next;
2151 kfree(psf);
2152 }
2153 pmc->mca_tomb = NULL;
2154 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2155 nextpsf = psf->sf_next;
2156 kfree(psf);
2157 }
2158 pmc->mca_sources = NULL;
2159 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2160 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2161 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2162}
2163
2164
2165static void igmp6_join_group(struct ifmcaddr6 *ma)
2166{
2167 unsigned long delay;
2168
2169 if (ma->mca_flags & MAF_NOREPORT)
2170 return;
2171
2172 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2173
fc4eba58 2174 delay = net_random() % unsolicited_report_interval(ma->idev);
1da177e4
LT		 2175
2176 spin_lock_bh(&ma->mca_lock);
2177 if (del_timer(&ma->mca_timer)) {
2178 atomic_dec(&ma->mca_refcnt);
2179 delay = ma->mca_timer.expires - jiffies;
2180 }
2181
2182 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2183 atomic_inc(&ma->mca_refcnt);
2184 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2185 spin_unlock_bh(&ma->mca_lock);
2186}
2187
2188static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2189 struct inet6_dev *idev)
2190{
2191 int err;
2192
5ab4a6c8
DS		 2193 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2194 * so no other readers or writers of iml or its sflist
2195 */
cfcabdcc 2196 if (!iml->sflist) {
1da177e4
LT		 2197 /* any-source empty exclude case */
2198 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2199 }
2200 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2201 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2202 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2203 iml->sflist = NULL;
2204 return err;
2205}
2206
2207static void igmp6_leave_group(struct ifmcaddr6 *ma)
2208{
2209 if (MLD_V1_SEEN(ma->idev)) {
2210 if (ma->mca_flags & MAF_LAST_REPORTER)
2211 igmp6_send(&ma->mca_addr, ma->idev->dev,
2212 ICMPV6_MGM_REDUCTION);
2213 } else {
2214 mld_add_delrec(ma->idev, ma);
2215 mld_ifc_event(ma->idev);
2216 }
2217}
2218
2219static void mld_gq_timer_expire(unsigned long data)
2220{
2221 struct inet6_dev *idev = (struct inet6_dev *)data;
2222
2223 idev->mc_gq_running = 0;
2224 mld_send_report(idev, NULL);
2225 __in6_dev_put(idev);
2226}
2227
2228static void mld_ifc_timer_expire(unsigned long data)
2229{
2230 struct inet6_dev *idev = (struct inet6_dev *)data;
2231
2232 mld_send_cr(idev);
2233 if (idev->mc_ifc_count) {
2234 idev->mc_ifc_count--;
2235 if (idev->mc_ifc_count)
2236 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2237 }
2238 __in6_dev_put(idev);
2239}
2240
2241static void mld_ifc_event(struct inet6_dev *idev)
2242{
2243 if (MLD_V1_SEEN(idev))
2244 return;
2245 idev->mc_ifc_count = idev->mc_qrv;
2246 mld_ifc_start_timer(idev, 1);
2247}
2248
2249
2250static void igmp6_timer_handler(unsigned long data)
2251{
2252 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2253
2254 if (MLD_V1_SEEN(ma->idev))
2255 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2256 else
2257 mld_send_report(ma->idev, ma);
2258
2259 spin_lock(&ma->mca_lock);
2260 ma->mca_flags |= MAF_LAST_REPORTER;
2261 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2262 spin_unlock(&ma->mca_lock);
2263 ma_put(ma);
2264}
2265
75c78500
MS		 2266/* Device changing type */
2267
2268void ipv6_mc_unmap(struct inet6_dev *idev)
2269{
2270 struct ifmcaddr6 *i;
2271
2272 /* Install multicast list, except for all-nodes (already installed) */
2273
2274 read_lock_bh(&idev->lock);
2275 for (i = idev->mc_list; i; i = i->next)
2276 igmp6_group_dropped(i);
2277 read_unlock_bh(&idev->lock);
2278}
2279
2280void ipv6_mc_remap(struct inet6_dev *idev)
2281{
2282 ipv6_mc_up(idev);
2283}
2284
1da177e4
LT		 2285/* Device going down */
2286
2287void ipv6_mc_down(struct inet6_dev *idev)
2288{
2289 struct ifmcaddr6 *i;
2290
2291 /* Withdraw multicast list */
2292
2293 read_lock_bh(&idev->lock);
2294 idev->mc_ifc_count = 0;
2295 if (del_timer(&idev->mc_ifc_timer))
2296 __in6_dev_put(idev);
2297 idev->mc_gq_running = 0;
2298 if (del_timer(&idev->mc_gq_timer))
2299 __in6_dev_put(idev);
b173ee48
HFS		 2300 if (del_timer(&idev->mc_dad_timer))
2301 __in6_dev_put(idev);
1da177e4
LT		 2302
2303 for (i = idev->mc_list; i; i=i->next)
2304 igmp6_group_dropped(i);
2305 read_unlock_bh(&idev->lock);
2306
2307 mld_clear_delrec(idev);
2308}
2309
2310
2311/* Device going up */
2312
2313void ipv6_mc_up(struct inet6_dev *idev)
2314{
2315 struct ifmcaddr6 *i;
2316
2317 /* Install multicast list, except for all-nodes (already installed) */
2318
2319 read_lock_bh(&idev->lock);
2320 for (i = idev->mc_list; i; i=i->next)
2321 igmp6_group_added(i);
2322 read_unlock_bh(&idev->lock);
2323}
2324
2325/* IPv6 device initialization. */
2326
2327void ipv6_mc_init_dev(struct inet6_dev *idev)
2328{
1da177e4 2329 write_lock_bh(&idev->lock);
6457d26b 2330 spin_lock_init(&idev->mc_lock);
1da177e4 2331 idev->mc_gq_running = 0;
b24b8a24
PE		 2332 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2333 (unsigned long)idev);
1da177e4
LT		 2334 idev->mc_tomb = NULL;
2335 idev->mc_ifc_count = 0;
b24b8a24
PE		 2336 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2337 (unsigned long)idev);
b173ee48
HFS		 2338 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2339 (unsigned long)idev);
1da177e4 2340 idev->mc_qrv = MLD_QRV_DEFAULT;
fc4eba58 2341 idev->mc_maxdelay = unsolicited_report_interval(idev);
1da177e4
LT		 2342 idev->mc_v1_seen = 0;
2343 write_unlock_bh(&idev->lock);
1da177e4
LT		 2344}
2345
2346/*
2347 * Device is about to be destroyed: clean up.
2348 */
2349
2350void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2351{
2352 struct ifmcaddr6 *i;
1da177e4
LT		 2353
2354 /* Deactivate timers */
2355 ipv6_mc_down(idev);
2356
2357 /* Delete all-nodes address. */
1da177e4
LT		 2358 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2359 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2360 * fail.
2361 */
f3ee4010 2362 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2363
f3ee4010
YH		 2364 if (idev->cnf.forwarding)
2365 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT		 2366
2367 write_lock_bh(&idev->lock);
2368 while ((i = idev->mc_list) != NULL) {
2369 idev->mc_list = i->next;
2370 write_unlock_bh(&idev->lock);
2371
2372 igmp6_group_dropped(i);
2373 ma_put(i);
2374
2375 write_lock_bh(&idev->lock);
2376 }
2377 write_unlock_bh(&idev->lock);
2378}
2379
2380#ifdef CONFIG_PROC_FS
2381struct igmp6_mc_iter_state {
b8ad0cbc 2382 struct seq_net_private p;
1da177e4
LT		 2383 struct net_device *dev;
2384 struct inet6_dev *idev;
2385};
2386
2387#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2388
2389static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2390{
2391 struct ifmcaddr6 *im = NULL;
2392 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2393 struct net *net = seq_file_net(seq);
1da177e4 2394
7562f876 2395 state->idev = NULL;
ce81b76a 2396 for_each_netdev_rcu(net, state->dev) {
1da177e4 2397 struct inet6_dev *idev;
ce81b76a 2398 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2399 if (!idev)
2400 continue;
2401 read_lock_bh(&idev->lock);
2402 im = idev->mc_list;
2403 if (im) {
2404 state->idev = idev;
2405 break;
2406 }
2407 read_unlock_bh(&idev->lock);
1da177e4
LT		 2408 }
2409 return im;
2410}
2411
2412static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2413{
2414 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2415
2416 im = im->next;
2417 while (!im) {
ce81b76a 2418 if (likely(state->idev != NULL))
1da177e4 2419 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2420
2421 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2422 if (!state->dev) {
2423 state->idev = NULL;
2424 break;
2425 }
ce81b76a 2426 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2427 if (!state->idev)
2428 continue;
2429 read_lock_bh(&state->idev->lock);
2430 im = state->idev->mc_list;
2431 }
2432 return im;
2433}
2434
2435static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2436{
2437 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2438 if (im)
2439 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2440 --pos;
2441 return pos ? NULL : im;
2442}
2443
2444static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2445 __acquires(RCU)
1da177e4 2446{
ce81b76a 2447 rcu_read_lock();
1da177e4
LT		 2448 return igmp6_mc_get_idx(seq, *pos);
2449}
2450
2451static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2452{
ce81b76a
ED		 2453 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2454
1da177e4
LT		 2455 ++*pos;
2456 return im;
2457}
2458
2459static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2460 __releases(RCU)
1da177e4
LT		 2461{
2462 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2463
1da177e4
LT		 2464 if (likely(state->idev != NULL)) {
2465 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2466 state->idev = NULL;
2467 }
2468 state->dev = NULL;
ce81b76a 2469 rcu_read_unlock();
1da177e4
LT		 2470}
2471
2472static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2473{
2474 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2475 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2476
2477 seq_printf(seq,
4b7a4274 2478 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2479 state->dev->ifindex, state->dev->name,
b071195d 2480 &im->mca_addr,
1da177e4
LT		 2481 im->mca_users, im->mca_flags,
2482 (im->mca_flags&MAF_TIMER_RUNNING) ?
2483 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2484 return 0;
2485}
2486
56b3d975 2487static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2488 .start = igmp6_mc_seq_start,
2489 .next = igmp6_mc_seq_next,
2490 .stop = igmp6_mc_seq_stop,
2491 .show = igmp6_mc_seq_show,
2492};
2493
2494static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2495{
b8ad0cbc
DL		 2496 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2497 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2498}
2499
9a32144e 2500static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2501 .owner = THIS_MODULE,
2502 .open = igmp6_mc_seq_open,
2503 .read = seq_read,
2504 .llseek = seq_lseek,
b8ad0cbc 2505 .release = seq_release_net,
1da177e4
LT		 2506};
2507
2508struct igmp6_mcf_iter_state {
b8ad0cbc 2509 struct seq_net_private p;
1da177e4
LT		 2510 struct net_device *dev;
2511 struct inet6_dev *idev;
2512 struct ifmcaddr6 *im;
2513};
2514
2515#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2516
2517static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2518{
2519 struct ip6_sf_list *psf = NULL;
2520 struct ifmcaddr6 *im = NULL;
2521 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2522 struct net *net = seq_file_net(seq);
1da177e4 2523
7562f876
PE		 2524 state->idev = NULL;
2525 state->im = NULL;
ce81b76a 2526 for_each_netdev_rcu(net, state->dev) {
1da177e4 2527 struct inet6_dev *idev;
ce81b76a 2528 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2529 if (unlikely(idev == NULL))
2530 continue;
2531 read_lock_bh(&idev->lock);
2532 im = idev->mc_list;
2533 if (likely(im != NULL)) {
2534 spin_lock_bh(&im->mca_lock);
2535 psf = im->mca_sources;
2536 if (likely(psf != NULL)) {
2537 state->im = im;
2538 state->idev = idev;
2539 break;
2540 }
2541 spin_unlock_bh(&im->mca_lock);
2542 }
2543 read_unlock_bh(&idev->lock);
1da177e4
LT		 2544 }
2545 return psf;
2546}
2547
2548static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2549{
2550 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2551
2552 psf = psf->sf_next;
2553 while (!psf) {
2554 spin_unlock_bh(&state->im->mca_lock);
2555 state->im = state->im->next;
2556 while (!state->im) {
ce81b76a 2557 if (likely(state->idev != NULL))
1da177e4 2558 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2559
2560 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2561 if (!state->dev) {
2562 state->idev = NULL;
2563 goto out;
2564 }
ce81b76a 2565 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2566 if (!state->idev)
2567 continue;
2568 read_lock_bh(&state->idev->lock);
2569 state->im = state->idev->mc_list;
2570 }
2571 if (!state->im)
2572 break;
2573 spin_lock_bh(&state->im->mca_lock);
2574 psf = state->im->mca_sources;
2575 }
2576out:
2577 return psf;
2578}
2579
2580static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2581{
2582 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2583 if (psf)
2584 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2585 --pos;
2586 return pos ? NULL : psf;
2587}
2588
2589static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2590 __acquires(RCU)
1da177e4 2591{
ce81b76a 2592 rcu_read_lock();
1da177e4
LT		 2593 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2594}
2595
2596static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2597{
2598 struct ip6_sf_list *psf;
2599 if (v == SEQ_START_TOKEN)
2600 psf = igmp6_mcf_get_first(seq);
2601 else
2602 psf = igmp6_mcf_get_next(seq, v);
2603 ++*pos;
2604 return psf;
2605}
2606
2607static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2608 __releases(RCU)
1da177e4
LT		 2609{
2610 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2611 if (likely(state->im != NULL)) {
2612 spin_unlock_bh(&state->im->mca_lock);
2613 state->im = NULL;
2614 }
2615 if (likely(state->idev != NULL)) {
2616 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2617 state->idev = NULL;
2618 }
2619 state->dev = NULL;
ce81b76a 2620 rcu_read_unlock();
1da177e4
LT		 2621}
2622
2623static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2624{
2625 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2626 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2627
2628 if (v == SEQ_START_TOKEN) {
1ab1457c 2629 seq_printf(seq,
1da177e4 2630 "%3s %6s "
9343e79a 2631 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2632 "Device", "Multicast Address",
2633 "Source Address", "INC", "EXC");
2634 } else {
2635 seq_printf(seq,
4b7a4274 2636 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 2637 state->dev->ifindex, state->dev->name,
b071195d
HH		 2638 &state->im->mca_addr,
2639 &psf->sf_addr,
1da177e4
LT		 2640 psf->sf_count[MCAST_INCLUDE],
2641 psf->sf_count[MCAST_EXCLUDE]);
2642 }
2643 return 0;
2644}
2645
56b3d975 2646static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2647 .start = igmp6_mcf_seq_start,
2648 .next = igmp6_mcf_seq_next,
2649 .stop = igmp6_mcf_seq_stop,
2650 .show = igmp6_mcf_seq_show,
2651};
2652
2653static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2654{
b8ad0cbc
DL		 2655 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2656 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2657}
2658
9a32144e 2659static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2660 .owner = THIS_MODULE,
2661 .open = igmp6_mcf_seq_open,
2662 .read = seq_read,
2663 .llseek = seq_lseek,
b8ad0cbc 2664 .release = seq_release_net,
1da177e4 2665};
ea82edf7 2666
2c8c1e72 2667static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL		 2668{
2669 int err;
2670
2671 err = -ENOMEM;
d4beaa66 2672 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
ea82edf7 2673 goto out;
d4beaa66
G		 2674 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2675 &igmp6_mcf_seq_fops))
ea82edf7
DL		 2676 goto out_proc_net_igmp6;
2677
2678 err = 0;
2679out:
2680 return err;
2681
2682out_proc_net_igmp6:
ece31ffd 2683 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL		 2684 goto out;
2685}
2686
2c8c1e72 2687static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7 2688{
ece31ffd
G		 2689 remove_proc_entry("mcfilter6", net->proc_net);
2690 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL		 2691}
2692#else
2c8c1e72 2693static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL		 2694{
2695 return 0;
2696}
2c8c1e72 2697static inline void igmp6_proc_exit(struct net *net)
ea82edf7 2698{
ea82edf7 2699}
1da177e4
LT		 2700#endif
2701
2c8c1e72 2702static int __net_init igmp6_net_init(struct net *net)
1da177e4 2703{
1da177e4
LT		 2704 int err;
2705
1ed8516f
DL		 2706 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2707 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4 2708 if (err < 0) {
f3213831 2709 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
1da177e4 2710 err);
b8ad0cbc 2711 goto out;
1da177e4
LT		 2712 }
2713
1ed8516f 2714 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2715
ea82edf7
DL		 2716 err = igmp6_proc_init(net);
2717 if (err)
b8ad0cbc 2718 goto out_sock_create;
b8ad0cbc
DL		 2719out:
2720 return err;
2721
2722out_sock_create:
1ed8516f 2723 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2724 goto out;
1da177e4
LT		 2725}
2726
2c8c1e72 2727static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 2728{
1ed8516f 2729 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2730 igmp6_proc_exit(net);
1da177e4 2731}
b8ad0cbc
DL		 2732
2733static struct pernet_operations igmp6_net_ops = {
2734 .init = igmp6_net_init,
2735 .exit = igmp6_net_exit,
2736};
2737
2738int __init igmp6_init(void)
2739{
2740 return register_pernet_subsys(&igmp6_net_ops);
2741}
2742
2743void igmp6_cleanup(void)
2744{
2745 unregister_pernet_subsys(&igmp6_net_ops);
2746}
Linux 6.x block layer and io_uring tree(s)