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Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck...
[linux-2.6-block.git] / net / ipv6 / mcast.c
CommitLineData
1da177e4
LT		 1/*
2 * Multicast support for IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1ab1457c 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
1da177e4
LT		 9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16/* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
1da177e4
LT		 29#include <linux/module.h>
30#include <linux/errno.h>
31#include <linux/types.h>
32#include <linux/string.h>
33#include <linux/socket.h>
34#include <linux/sockios.h>
35#include <linux/jiffies.h>
36#include <linux/times.h>
37#include <linux/net.h>
38#include <linux/in.h>
39#include <linux/in6.h>
40#include <linux/netdevice.h>
41#include <linux/if_arp.h>
42#include <linux/route.h>
43#include <linux/init.h>
44#include <linux/proc_fs.h>
45#include <linux/seq_file.h>
5a0e3ad6 46#include <linux/slab.h>
6e7cb837 47#include <net/mld.h>
1da177e4
LT		 48
49#include <linux/netfilter.h>
50#include <linux/netfilter_ipv6.h>
51
457c4cbc 52#include <net/net_namespace.h>
1da177e4
LT		 53#include <net/sock.h>
54#include <net/snmp.h>
55
56#include <net/ipv6.h>
57#include <net/protocol.h>
58#include <net/if_inet6.h>
59#include <net/ndisc.h>
60#include <net/addrconf.h>
61#include <net/ip6_route.h>
1ed8516f 62#include <net/inet_common.h>
1da177e4
LT		 63
64#include <net/ip6_checksum.h>
65
66/* Set to 3 to get tracing... */
67#define MCAST_DEBUG 2
68
69#if MCAST_DEBUG >= 3
70#define MDBG(x) printk x
71#else
72#define MDBG(x)
73#endif
74
6e7cb837
YH		 75/* Ensure that we have struct in6_addr aligned on 32bit word. */
76static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
77 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
78 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
79 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
1da177e4
LT		 80};
81
82static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
83
84/* Big mc list lock for all the sockets */
456b61bc 85static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
1da177e4 86
1da177e4
LT		 87static void igmp6_join_group(struct ifmcaddr6 *ma);
88static void igmp6_leave_group(struct ifmcaddr6 *ma);
89static void igmp6_timer_handler(unsigned long data);
90
91static void mld_gq_timer_expire(unsigned long data);
92static void mld_ifc_timer_expire(unsigned long data);
93static void mld_ifc_event(struct inet6_dev *idev);
94static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
b71d1d42 95static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
1da177e4
LT		 96static void mld_clear_delrec(struct inet6_dev *idev);
97static int sf_setstate(struct ifmcaddr6 *pmc);
98static void sf_markstate(struct ifmcaddr6 *pmc);
99static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
b71d1d42
ED		 100static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
101 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4 102 int delta);
b71d1d42
ED		 103static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
104 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 105 int delta);
106static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
107 struct inet6_dev *idev);
108
109
110#define IGMP6_UNSOLICITED_IVAL (10*HZ)
111#define MLD_QRV_DEFAULT 2
112
53b7997f 113#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
1da177e4
LT		 114 (idev)->cnf.force_mld_version == 1 || \
115 ((idev)->mc_v1_seen && \
116 time_before(jiffies, (idev)->mc_v1_seen)))
117
6f4353d8 118#define IPV6_MLD_MAX_MSF 64
1da177e4 119
ab32ea5d 120int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 121
122/*
123 * socket join on multicast group
124 */
125
456b61bc
ED		 126#define for_each_pmc_rcu(np, pmc) \
127 for (pmc = rcu_dereference(np->ipv6_mc_list); \
128 pmc != NULL; \
129 pmc = rcu_dereference(pmc->next))
130
9acd9f3a 131int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 132{
133 struct net_device *dev = NULL;
134 struct ipv6_mc_socklist *mc_lst;
135 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 136 struct net *net = sock_net(sk);
1da177e4
LT		 137 int err;
138
139 if (!ipv6_addr_is_multicast(addr))
140 return -EINVAL;
141
456b61bc
ED		 142 rcu_read_lock();
143 for_each_pmc_rcu(np, mc_lst) {
c9e3e8b6
DS		 144 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
145 ipv6_addr_equal(&mc_lst->addr, addr)) {
456b61bc 146 rcu_read_unlock();
c9e3e8b6
DS		 147 return -EADDRINUSE;
148 }
149 }
456b61bc 150 rcu_read_unlock();
c9e3e8b6 151
1da177e4
LT		 152 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
153
154 if (mc_lst == NULL)
155 return -ENOMEM;
156
157 mc_lst->next = NULL;
4e3fd7a0 158 mc_lst->addr = *addr;
1da177e4 159
96b52e61 160 rcu_read_lock();
1da177e4
LT		 161 if (ifindex == 0) {
162 struct rt6_info *rt;
b8ad0cbc 163 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4 164 if (rt) {
d1918542 165 dev = rt->dst.dev;
94e187c0 166 ip6_rt_put(rt);
1da177e4
LT		 167 }
168 } else
96b52e61 169 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT		 170
171 if (dev == NULL) {
96b52e61 172 rcu_read_unlock();
1da177e4
LT		 173 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174 return -ENODEV;
175 }
176
177 mc_lst->ifindex = dev->ifindex;
178 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 179 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 180 mc_lst->sflist = NULL;
181
182 /*
183 * now add/increase the group membership on the device
184 */
185
186 err = ipv6_dev_mc_inc(dev, addr);
187
188 if (err) {
96b52e61 189 rcu_read_unlock();
1da177e4 190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
1da177e4
LT		 191 return err;
192 }
193
456b61bc 194 spin_lock(&ipv6_sk_mc_lock);
1da177e4 195 mc_lst->next = np->ipv6_mc_list;
456b61bc
ED		 196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 198
96b52e61 199 rcu_read_unlock();
1da177e4
LT		 200
201 return 0;
202}
203
204/*
205 * socket leave on multicast group
206 */
9acd9f3a 207int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 208{
209 struct ipv6_pinfo *np = inet6_sk(sk);
456b61bc
ED		 210 struct ipv6_mc_socklist *mc_lst;
211 struct ipv6_mc_socklist __rcu **lnk;
3b1e0a65 212 struct net *net = sock_net(sk);
1da177e4 213
a858d64b
LW		 214 if (!ipv6_addr_is_multicast(addr))
215 return -EINVAL;
216
456b61bc
ED		 217 spin_lock(&ipv6_sk_mc_lock);
218 for (lnk = &np->ipv6_mc_list;
219 (mc_lst = rcu_dereference_protected(*lnk,
220 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
221 lnk = &mc_lst->next) {
1da177e4
LT		 222 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
223 ipv6_addr_equal(&mc_lst->addr, addr)) {
224 struct net_device *dev;
225
226 *lnk = mc_lst->next;
456b61bc 227 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 228
96b52e61
ED		 229 rcu_read_lock();
230 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
b8ad0cbc 231 if (dev != NULL) {
96b52e61 232 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 233
acd6e00b 234 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 235 if (idev)
1da177e4 236 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 237 } else
238 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
96b52e61 239 rcu_read_unlock();
456b61bc 240 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 241 kfree_rcu(mc_lst, rcu);
1da177e4
LT		 242 return 0;
243 }
244 }
456b61bc 245 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 246
9951f036 247 return -EADDRNOTAVAIL;
1da177e4
LT		 248}
249
96b52e61
ED		 250/* called with rcu_read_lock() */
251static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
b71d1d42 252 const struct in6_addr *group,
96b52e61 253 int ifindex)
1da177e4
LT		 254{
255 struct net_device *dev = NULL;
256 struct inet6_dev *idev = NULL;
257
258 if (ifindex == 0) {
96b52e61 259 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4 260
1da177e4 261 if (rt) {
d1918542 262 dev = rt->dst.dev;
94e187c0 263 ip6_rt_put(rt);
1da177e4
LT		 264 }
265 } else
96b52e61 266 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT		 267
268 if (!dev)
96b52e61
ED		 269 return NULL;
270 idev = __in6_dev_get(dev);
448eb71f 271 if (!idev)
8a22c99a 272 return NULL;
1da177e4 273 read_lock_bh(&idev->lock);
96b52e61
ED		 274 if (idev->dead) {
275 read_unlock_bh(&idev->lock);
276 return NULL;
277 }
1da177e4
LT		 278 return idev;
279}
280
281void ipv6_sock_mc_close(struct sock *sk)
282{
283 struct ipv6_pinfo *np = inet6_sk(sk);
284 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 285 struct net *net = sock_net(sk);
1da177e4 286
0e1efe9d
ED		 287 if (!rcu_access_pointer(np->ipv6_mc_list))
288 return;
289
456b61bc
ED		 290 spin_lock(&ipv6_sk_mc_lock);
291 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
292 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
1da177e4
LT		 293 struct net_device *dev;
294
295 np->ipv6_mc_list = mc_lst->next;
456b61bc 296 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 297
96b52e61
ED		 298 rcu_read_lock();
299 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
1da177e4 300 if (dev) {
96b52e61 301 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 302
acd6e00b 303 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 304 if (idev)
1da177e4 305 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 306 } else
307 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
96b52e61 308 rcu_read_unlock();
1da177e4 309
456b61bc 310 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 311 kfree_rcu(mc_lst, rcu);
456b61bc
ED		 312
313 spin_lock(&ipv6_sk_mc_lock);
1da177e4 314 }
456b61bc 315 spin_unlock(&ipv6_sk_mc_lock);
1da177e4
LT		 316}
317
318int ip6_mc_source(int add, int omode, struct sock *sk,
319 struct group_source_req *pgsr)
320{
321 struct in6_addr *source, *group;
322 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 323 struct inet6_dev *idev;
324 struct ipv6_pinfo *inet6 = inet6_sk(sk);
325 struct ip6_sf_socklist *psl;
3b1e0a65 326 struct net *net = sock_net(sk);
1da177e4 327 int i, j, rv;
c9e3e8b6 328 int leavegroup = 0;
5ab4a6c8 329 int pmclocked = 0;
1da177e4
LT		 330 int err;
331
1da177e4
LT		 332 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
333 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
334
335 if (!ipv6_addr_is_multicast(group))
336 return -EINVAL;
337
96b52e61
ED		 338 rcu_read_lock();
339 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
340 if (!idev) {
341 rcu_read_unlock();
1da177e4 342 return -ENODEV;
96b52e61 343 }
1da177e4
LT		 344
345 err = -EADDRNOTAVAIL;
346
456b61bc 347 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 348 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
349 continue;
350 if (ipv6_addr_equal(&pmc->addr, group))
351 break;
352 }
917f2f10
DS		 353 if (!pmc) { /* must have a prior join */
354 err = -EINVAL;
1da177e4 355 goto done;
917f2f10 356 }
1da177e4
LT		 357 /* if a source filter was set, must be the same mode as before */
358 if (pmc->sflist) {
917f2f10
DS		 359 if (pmc->sfmode != omode) {
360 err = -EINVAL;
1da177e4 361 goto done;
917f2f10 362 }
1da177e4
LT		 363 } else if (pmc->sfmode != omode) {
364 /* allow mode switches for empty-set filters */
365 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
366 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
367 pmc->sfmode = omode;
368 }
369
96b52e61 370 write_lock(&pmc->sflock);
5ab4a6c8
DS		 371 pmclocked = 1;
372
1da177e4
LT		 373 psl = pmc->sflist;
374 if (!add) {
375 if (!psl)
917f2f10 376 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 377 rv = !0;
378 for (i=0; i<psl->sl_count; i++) {
379 rv = memcmp(&psl->sl_addr[i], source,
380 sizeof(struct in6_addr));
381 if (rv == 0)
382 break;
383 }
384 if (rv) /* source not found */
917f2f10 385 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 386
c9e3e8b6
DS		 387 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
388 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
389 leavegroup = 1;
390 goto done;
391 }
392
1da177e4
LT		 393 /* update the interface filter */
394 ip6_mc_del_src(idev, group, omode, 1, source, 1);
395
396 for (j=i+1; j<psl->sl_count; j++)
397 psl->sl_addr[j-1] = psl->sl_addr[j];
398 psl->sl_count--;
399 err = 0;
400 goto done;
401 }
402 /* else, add a new source to the filter */
403
404 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
405 err = -ENOBUFS;
406 goto done;
407 }
408 if (!psl || psl->sl_count == psl->sl_max) {
409 struct ip6_sf_socklist *newpsl;
410 int count = IP6_SFBLOCK;
411
412 if (psl)
413 count += psl->sl_max;
8b3a7005 414 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 415 if (!newpsl) {
416 err = -ENOBUFS;
417 goto done;
418 }
419 newpsl->sl_max = count;
420 newpsl->sl_count = count - IP6_SFBLOCK;
421 if (psl) {
422 for (i=0; i<psl->sl_count; i++)
423 newpsl->sl_addr[i] = psl->sl_addr[i];
424 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
425 }
426 pmc->sflist = psl = newpsl;
427 }
428 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
429 for (i=0; i<psl->sl_count; i++) {
430 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
431 if (rv == 0)
432 break;
433 }
434 if (rv == 0) /* address already there is an error */
435 goto done;
436 for (j=psl->sl_count-1; j>=i; j--)
437 psl->sl_addr[j+1] = psl->sl_addr[j];
438 psl->sl_addr[i] = *source;
439 psl->sl_count++;
440 err = 0;
441 /* update the interface list */
442 ip6_mc_add_src(idev, group, omode, 1, source, 1);
443done:
5ab4a6c8 444 if (pmclocked)
96b52e61 445 write_unlock(&pmc->sflock);
1da177e4 446 read_unlock_bh(&idev->lock);
96b52e61 447 rcu_read_unlock();
c9e3e8b6
DS		 448 if (leavegroup)
449 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 450 return err;
451}
452
453int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
454{
b71d1d42 455 const struct in6_addr *group;
1da177e4 456 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 457 struct inet6_dev *idev;
458 struct ipv6_pinfo *inet6 = inet6_sk(sk);
459 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 460 struct net *net = sock_net(sk);
9951f036 461 int leavegroup = 0;
1da177e4
LT		 462 int i, err;
463
464 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
465
466 if (!ipv6_addr_is_multicast(group))
467 return -EINVAL;
468 if (gsf->gf_fmode != MCAST_INCLUDE &&
469 gsf->gf_fmode != MCAST_EXCLUDE)
470 return -EINVAL;
471
96b52e61
ED		 472 rcu_read_lock();
473 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 474
96b52e61
ED		 475 if (!idev) {
476 rcu_read_unlock();
1da177e4 477 return -ENODEV;
96b52e61 478 }
1da177e4 479
9c05989b 480 err = 0;
5ab4a6c8 481
9951f036
DS		 482 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
483 leavegroup = 1;
484 goto done;
485 }
486
456b61bc 487 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 488 if (pmc->ifindex != gsf->gf_interface)
489 continue;
490 if (ipv6_addr_equal(&pmc->addr, group))
491 break;
492 }
917f2f10
DS		 493 if (!pmc) { /* must have a prior join */
494 err = -EINVAL;
1da177e4 495 goto done;
917f2f10 496 }
1da177e4 497 if (gsf->gf_numsrc) {
8b3a7005
KK		 498 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
499 GFP_ATOMIC);
1da177e4
LT		 500 if (!newpsl) {
501 err = -ENOBUFS;
502 goto done;
503 }
504 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
505 for (i=0; i<newpsl->sl_count; ++i) {
506 struct sockaddr_in6 *psin6;
507
508 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
509 newpsl->sl_addr[i] = psin6->sin6_addr;
510 }
511 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
512 newpsl->sl_count, newpsl->sl_addr, 0);
513 if (err) {
514 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
515 goto done;
516 }
8713dbf0 517 } else {
1da177e4 518 newpsl = NULL;
8713dbf0
YZ		 519 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
520 }
5ab4a6c8 521
96b52e61 522 write_lock(&pmc->sflock);
1da177e4
LT		 523 psl = pmc->sflist;
524 if (psl) {
525 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
526 psl->sl_count, psl->sl_addr, 0);
527 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
528 } else
529 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
530 pmc->sflist = newpsl;
531 pmc->sfmode = gsf->gf_fmode;
96b52e61 532 write_unlock(&pmc->sflock);
917f2f10 533 err = 0;
1da177e4
LT		 534done:
535 read_unlock_bh(&idev->lock);
96b52e61 536 rcu_read_unlock();
9951f036
DS		 537 if (leavegroup)
538 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 539 return err;
540}
541
542int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
543 struct group_filter __user *optval, int __user *optlen)
544{
545 int err, i, count, copycount;
b71d1d42 546 const struct in6_addr *group;
1da177e4
LT		 547 struct ipv6_mc_socklist *pmc;
548 struct inet6_dev *idev;
1da177e4
LT		 549 struct ipv6_pinfo *inet6 = inet6_sk(sk);
550 struct ip6_sf_socklist *psl;
3b1e0a65 551 struct net *net = sock_net(sk);
1da177e4
LT		 552
553 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
554
555 if (!ipv6_addr_is_multicast(group))
556 return -EINVAL;
557
96b52e61
ED		 558 rcu_read_lock();
559 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 560
96b52e61
ED		 561 if (!idev) {
562 rcu_read_unlock();
1da177e4 563 return -ENODEV;
96b52e61 564 }
1da177e4
LT		 565
566 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 567 /*
568 * changes to the ipv6_mc_list require the socket lock and
569 * a read lock on ip6_sk_mc_lock. We have the socket lock,
570 * so reading the list is safe.
571 */
1da177e4 572
456b61bc 573 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 574 if (pmc->ifindex != gsf->gf_interface)
575 continue;
576 if (ipv6_addr_equal(group, &pmc->addr))
577 break;
578 }
579 if (!pmc) /* must have a prior join */
580 goto done;
581 gsf->gf_fmode = pmc->sfmode;
582 psl = pmc->sflist;
583 count = psl ? psl->sl_count : 0;
584 read_unlock_bh(&idev->lock);
96b52e61 585 rcu_read_unlock();
1da177e4
LT		 586
587 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
588 gsf->gf_numsrc = count;
589 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
590 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
591 return -EFAULT;
592 }
5ab4a6c8
DS		 593 /* changes to psl require the socket lock, a read lock on
594 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
595 * have the socket lock, so reading here is safe.
596 */
1da177e4
LT		 597 for (i=0; i<copycount; i++) {
598 struct sockaddr_in6 *psin6;
599 struct sockaddr_storage ss;
600
601 psin6 = (struct sockaddr_in6 *)&ss;
602 memset(&ss, 0, sizeof(ss));
603 psin6->sin6_family = AF_INET6;
604 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 605 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 606 return -EFAULT;
607 }
608 return 0;
609done:
610 read_unlock_bh(&idev->lock);
96b52e61 611 rcu_read_unlock();
1da177e4
LT		 612 return err;
613}
614
a50feda5
ED		 615bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
616 const struct in6_addr *src_addr)
1da177e4
LT		 617{
618 struct ipv6_pinfo *np = inet6_sk(sk);
619 struct ipv6_mc_socklist *mc;
620 struct ip6_sf_socklist *psl;
a50feda5 621 bool rv = true;
1da177e4 622
456b61bc
ED		 623 rcu_read_lock();
624 for_each_pmc_rcu(np, mc) {
1da177e4
LT		 625 if (ipv6_addr_equal(&mc->addr, mc_addr))
626 break;
627 }
628 if (!mc) {
456b61bc 629 rcu_read_unlock();
a50feda5 630 return true;
1da177e4 631 }
5ab4a6c8 632 read_lock(&mc->sflock);
1da177e4
LT		 633 psl = mc->sflist;
634 if (!psl) {
635 rv = mc->sfmode == MCAST_EXCLUDE;
636 } else {
637 int i;
638
639 for (i=0; i<psl->sl_count; i++) {
640 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
641 break;
642 }
643 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
a50feda5 644 rv = false;
1da177e4 645 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
a50feda5 646 rv = false;
1da177e4 647 }
5ab4a6c8 648 read_unlock(&mc->sflock);
456b61bc 649 rcu_read_unlock();
1da177e4
LT		 650
651 return rv;
652}
653
654static void ma_put(struct ifmcaddr6 *mc)
655{
656 if (atomic_dec_and_test(&mc->mca_refcnt)) {
657 in6_dev_put(mc->idev);
658 kfree(mc);
659 }
660}
661
662static void igmp6_group_added(struct ifmcaddr6 *mc)
663{
664 struct net_device *dev = mc->idev->dev;
665 char buf[MAX_ADDR_LEN];
666
667 spin_lock_bh(&mc->mca_lock);
668 if (!(mc->mca_flags&MAF_LOADED)) {
669 mc->mca_flags |= MAF_LOADED;
670 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 671 dev_mc_add(dev, buf);
1da177e4
LT		 672 }
673 spin_unlock_bh(&mc->mca_lock);
674
675 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
676 return;
677
678 if (MLD_V1_SEEN(mc->idev)) {
679 igmp6_join_group(mc);
680 return;
681 }
682 /* else v2 */
683
684 mc->mca_crcount = mc->idev->mc_qrv;
685 mld_ifc_event(mc->idev);
686}
687
688static void igmp6_group_dropped(struct ifmcaddr6 *mc)
689{
690 struct net_device *dev = mc->idev->dev;
691 char buf[MAX_ADDR_LEN];
692
693 spin_lock_bh(&mc->mca_lock);
694 if (mc->mca_flags&MAF_LOADED) {
695 mc->mca_flags &= ~MAF_LOADED;
696 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 697 dev_mc_del(dev, buf);
1da177e4
LT		 698 }
699
700 if (mc->mca_flags & MAF_NOREPORT)
701 goto done;
702 spin_unlock_bh(&mc->mca_lock);
703
704 if (!mc->idev->dead)
705 igmp6_leave_group(mc);
706
707 spin_lock_bh(&mc->mca_lock);
708 if (del_timer(&mc->mca_timer))
709 atomic_dec(&mc->mca_refcnt);
710done:
711 ip6_mc_clear_src(mc);
712 spin_unlock_bh(&mc->mca_lock);
713}
714
715/*
716 * deleted ifmcaddr6 manipulation
717 */
718static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
719{
720 struct ifmcaddr6 *pmc;
721
722 /* this is an "ifmcaddr6" for convenience; only the fields below
723 * are actually used. In particular, the refcnt and users are not
724 * used for management of the delete list. Using the same structure
725 * for deleted items allows change reports to use common code with
726 * non-deleted or query-response MCA's.
727 */
0c600eda 728 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 729 if (!pmc)
730 return;
0c600eda 731
1da177e4
LT		 732 spin_lock_bh(&im->mca_lock);
733 spin_lock_init(&pmc->mca_lock);
734 pmc->idev = im->idev;
735 in6_dev_hold(idev);
736 pmc->mca_addr = im->mca_addr;
737 pmc->mca_crcount = idev->mc_qrv;
738 pmc->mca_sfmode = im->mca_sfmode;
739 if (pmc->mca_sfmode == MCAST_INCLUDE) {
740 struct ip6_sf_list *psf;
741
742 pmc->mca_tomb = im->mca_tomb;
743 pmc->mca_sources = im->mca_sources;
744 im->mca_tomb = im->mca_sources = NULL;
745 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
746 psf->sf_crcount = pmc->mca_crcount;
747 }
748 spin_unlock_bh(&im->mca_lock);
749
6457d26b 750 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 751 pmc->next = idev->mc_tomb;
752 idev->mc_tomb = pmc;
6457d26b 753 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 754}
755
b71d1d42 756static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
1da177e4
LT		 757{
758 struct ifmcaddr6 *pmc, *pmc_prev;
759 struct ip6_sf_list *psf, *psf_next;
760
6457d26b 761 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 762 pmc_prev = NULL;
763 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
764 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
765 break;
766 pmc_prev = pmc;
767 }
768 if (pmc) {
769 if (pmc_prev)
770 pmc_prev->next = pmc->next;
771 else
772 idev->mc_tomb = pmc->next;
773 }
6457d26b
SH		 774 spin_unlock_bh(&idev->mc_lock);
775
1da177e4
LT		 776 if (pmc) {
777 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
778 psf_next = psf->sf_next;
779 kfree(psf);
780 }
781 in6_dev_put(pmc->idev);
782 kfree(pmc);
783 }
784}
785
786static void mld_clear_delrec(struct inet6_dev *idev)
787{
788 struct ifmcaddr6 *pmc, *nextpmc;
789
6457d26b 790 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 791 pmc = idev->mc_tomb;
792 idev->mc_tomb = NULL;
6457d26b 793 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 794
795 for (; pmc; pmc = nextpmc) {
796 nextpmc = pmc->next;
797 ip6_mc_clear_src(pmc);
798 in6_dev_put(pmc->idev);
799 kfree(pmc);
800 }
801
802 /* clear dead sources, too */
803 read_lock_bh(&idev->lock);
804 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
805 struct ip6_sf_list *psf, *psf_next;
806
807 spin_lock_bh(&pmc->mca_lock);
808 psf = pmc->mca_tomb;
809 pmc->mca_tomb = NULL;
810 spin_unlock_bh(&pmc->mca_lock);
811 for (; psf; psf=psf_next) {
812 psf_next = psf->sf_next;
813 kfree(psf);
814 }
815 }
816 read_unlock_bh(&idev->lock);
817}
818
819
820/*
821 * device multicast group inc (add if not found)
822 */
9acd9f3a 823int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 824{
825 struct ifmcaddr6 *mc;
826 struct inet6_dev *idev;
827
96b52e61 828 /* we need to take a reference on idev */
1da177e4
LT		 829 idev = in6_dev_get(dev);
830
831 if (idev == NULL)
832 return -EINVAL;
833
834 write_lock_bh(&idev->lock);
835 if (idev->dead) {
836 write_unlock_bh(&idev->lock);
837 in6_dev_put(idev);
838 return -ENODEV;
839 }
840
841 for (mc = idev->mc_list; mc; mc = mc->next) {
842 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
843 mc->mca_users++;
844 write_unlock_bh(&idev->lock);
845 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
846 NULL, 0);
847 in6_dev_put(idev);
848 return 0;
849 }
850 }
851
852 /*
853 * not found: create a new one.
854 */
855
0c600eda 856 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 857
858 if (mc == NULL) {
859 write_unlock_bh(&idev->lock);
860 in6_dev_put(idev);
861 return -ENOMEM;
862 }
863
b24b8a24 864 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4 865
4e3fd7a0 866 mc->mca_addr = *addr;
96b52e61 867 mc->idev = idev; /* (reference taken) */
1da177e4
LT		 868 mc->mca_users = 1;
869 /* mca_stamp should be updated upon changes */
870 mc->mca_cstamp = mc->mca_tstamp = jiffies;
871 atomic_set(&mc->mca_refcnt, 2);
872 spin_lock_init(&mc->mca_lock);
873
874 /* initial mode is (EX, empty) */
875 mc->mca_sfmode = MCAST_EXCLUDE;
876 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
877
878 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
879 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
880 mc->mca_flags |= MAF_NOREPORT;
881
882 mc->next = idev->mc_list;
883 idev->mc_list = mc;
884 write_unlock_bh(&idev->lock);
885
886 mld_del_delrec(idev, &mc->mca_addr);
887 igmp6_group_added(mc);
888 ma_put(mc);
889 return 0;
890}
891
892/*
893 * device multicast group del
894 */
9acd9f3a 895int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 896{
897 struct ifmcaddr6 *ma, **map;
898
899 write_lock_bh(&idev->lock);
900 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
901 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
902 if (--ma->mca_users == 0) {
903 *map = ma->next;
904 write_unlock_bh(&idev->lock);
905
906 igmp6_group_dropped(ma);
907
908 ma_put(ma);
909 return 0;
910 }
911 write_unlock_bh(&idev->lock);
912 return 0;
913 }
914 }
915 write_unlock_bh(&idev->lock);
916
917 return -ENOENT;
918}
919
9acd9f3a 920int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4 921{
96b52e61 922 struct inet6_dev *idev;
1da177e4
LT		 923 int err;
924
96b52e61 925 rcu_read_lock();
1da177e4 926
96b52e61
ED		 927 idev = __in6_dev_get(dev);
928 if (!idev)
929 err = -ENODEV;
930 else
931 err = __ipv6_dev_mc_dec(idev, addr);
1da177e4 932
96b52e61 933 rcu_read_unlock();
1da177e4
LT		 934 return err;
935}
936
937/*
938 * identify MLD packets for MLD filter exceptions
939 */
a50feda5 940bool ipv6_is_mld(struct sk_buff *skb, int nexthdr)
1da177e4
LT		 941{
942 struct icmp6hdr *pic;
943
944 if (nexthdr != IPPROTO_ICMPV6)
a50feda5 945 return false;
1da177e4
LT		 946
947 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
a50feda5 948 return false;
1da177e4 949
cc70ab26 950 pic = icmp6_hdr(skb);
1da177e4
LT		 951
952 switch (pic->icmp6_type) {
953 case ICMPV6_MGM_QUERY:
954 case ICMPV6_MGM_REPORT:
955 case ICMPV6_MGM_REDUCTION:
956 case ICMPV6_MLD2_REPORT:
a50feda5 957 return true;
1da177e4
LT		 958 default:
959 break;
960 }
a50feda5 961 return false;
1da177e4
LT		 962}
963
964/*
965 * check if the interface/address pair is valid
966 */
a50feda5
ED		 967bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
968 const struct in6_addr *src_addr)
1da177e4
LT		 969{
970 struct inet6_dev *idev;
971 struct ifmcaddr6 *mc;
a50feda5 972 bool rv = false;
1da177e4 973
96b52e61
ED		 974 rcu_read_lock();
975 idev = __in6_dev_get(dev);
1da177e4
LT		 976 if (idev) {
977 read_lock_bh(&idev->lock);
978 for (mc = idev->mc_list; mc; mc=mc->next) {
979 if (ipv6_addr_equal(&mc->mca_addr, group))
980 break;
981 }
982 if (mc) {
983 if (src_addr && !ipv6_addr_any(src_addr)) {
984 struct ip6_sf_list *psf;
985
986 spin_lock_bh(&mc->mca_lock);
987 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
988 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
989 break;
990 }
991 if (psf)
992 rv = psf->sf_count[MCAST_INCLUDE] ||
993 psf->sf_count[MCAST_EXCLUDE] !=
994 mc->mca_sfcount[MCAST_EXCLUDE];
995 else
996 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
997 spin_unlock_bh(&mc->mca_lock);
998 } else
a50feda5 999 rv = true; /* don't filter unspecified source */
1da177e4
LT		 1000 }
1001 read_unlock_bh(&idev->lock);
1da177e4 1002 }
96b52e61 1003 rcu_read_unlock();
1da177e4
LT		 1004 return rv;
1005}
1006
1007static void mld_gq_start_timer(struct inet6_dev *idev)
1008{
1009 int tv = net_random() % idev->mc_maxdelay;
1010
1011 idev->mc_gq_running = 1;
1012 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1013 in6_dev_hold(idev);
1014}
1015
1016static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1017{
1018 int tv = net_random() % delay;
1019
1020 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1021 in6_dev_hold(idev);
1022}
1023
1024/*
1025 * IGMP handling (alias multicast ICMPv6 messages)
1026 */
1027
1028static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1029{
1030 unsigned long delay = resptime;
1031
1032 /* Do not start timer for these addresses */
1033 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1034 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1035 return;
1036
1037 if (del_timer(&ma->mca_timer)) {
1038 atomic_dec(&ma->mca_refcnt);
1039 delay = ma->mca_timer.expires - jiffies;
1040 }
1041
1042 if (delay >= resptime) {
1043 if (resptime)
1044 delay = net_random() % resptime;
1045 else
1046 delay = 1;
1047 }
1048 ma->mca_timer.expires = jiffies + delay;
1049 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1050 atomic_inc(&ma->mca_refcnt);
1051 ma->mca_flags |= MAF_TIMER_RUNNING;
1052}
1053
5ab4a6c8 1054/* mark EXCLUDE-mode sources */
a50feda5
ED		 1055static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1056 const struct in6_addr *srcs)
1da177e4
LT		 1057{
1058 struct ip6_sf_list *psf;
1059 int i, scount;
1060
1061 scount = 0;
1062 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1063 if (scount == nsrcs)
1064 break;
5ab4a6c8
DS		 1065 for (i=0; i<nsrcs; i++) {
1066 /* skip inactive filters */
e05c4ad3 1067 if (psf->sf_count[MCAST_INCLUDE] ||
5ab4a6c8
DS		 1068 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1069 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 1070 break;
5ab4a6c8
DS		 1071 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1072 scount++;
1073 break;
1074 }
1075 }
1076 }
1077 pmc->mca_flags &= ~MAF_GSQUERY;
1078 if (scount == nsrcs) /* all sources excluded */
a50feda5
ED		 1079 return false;
1080 return true;
5ab4a6c8
DS		 1081}
1082
a50feda5
ED		 1083static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1084 const struct in6_addr *srcs)
5ab4a6c8
DS		 1085{
1086 struct ip6_sf_list *psf;
1087 int i, scount;
1088
1089 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1090 return mld_xmarksources(pmc, nsrcs, srcs);
1091
1092 /* mark INCLUDE-mode sources */
1093
1094 scount = 0;
1095 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1096 if (scount == nsrcs)
1097 break;
1098 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1099 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1100 psf->sf_gsresp = 1;
1101 scount++;
1102 break;
1103 }
5ab4a6c8
DS		 1104 }
1105 }
1106 if (!scount) {
1107 pmc->mca_flags &= ~MAF_GSQUERY;
a50feda5 1108 return false;
1da177e4 1109 }
5ab4a6c8 1110 pmc->mca_flags |= MAF_GSQUERY;
a50feda5 1111 return true;
1da177e4
LT		 1112}
1113
96b52e61 1114/* called with rcu_read_lock() */
1da177e4
LT		 1115int igmp6_event_query(struct sk_buff *skb)
1116{
97300b5f 1117 struct mld2_query *mlh2 = NULL;
1da177e4 1118 struct ifmcaddr6 *ma;
b71d1d42 1119 const struct in6_addr *group;
1da177e4
LT		 1120 unsigned long max_delay;
1121 struct inet6_dev *idev;
6e7cb837 1122 struct mld_msg *mld;
1da177e4
LT		 1123 int group_type;
1124 int mark = 0;
1125 int len;
1126
1127 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1128 return -EINVAL;
1129
1130 /* compute payload length excluding extension headers */
0660e03f 1131 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1132 len -= skb_network_header_len(skb);
1da177e4
LT		 1133
1134 /* Drop queries with not link local source */
0660e03f 1135 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1136 return -EINVAL;
1137
96b52e61 1138 idev = __in6_dev_get(skb->dev);
1da177e4
LT		 1139
1140 if (idev == NULL)
1141 return 0;
1142
6e7cb837
YH		 1143 mld = (struct mld_msg *)icmp6_hdr(skb);
1144 group = &mld->mld_mca;
1da177e4
LT		 1145 group_type = ipv6_addr_type(group);
1146
1147 if (group_type != IPV6_ADDR_ANY &&
96b52e61 1148 !(group_type&IPV6_ADDR_MULTICAST))
1da177e4 1149 return -EINVAL;
1da177e4
LT		 1150
1151 if (len == 24) {
1152 int switchback;
1153 /* MLDv1 router present */
1154
1155 /* Translate milliseconds to jiffies */
6e7cb837 1156 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1da177e4
LT		 1157
1158 switchback = (idev->mc_qrv + 1) * max_delay;
1159 idev->mc_v1_seen = jiffies + switchback;
1160
1161 /* cancel the interface change timer */
1162 idev->mc_ifc_count = 0;
1163 if (del_timer(&idev->mc_ifc_timer))
1164 __in6_dev_put(idev);
1165 /* clear deleted report items */
1166 mld_clear_delrec(idev);
1167 } else if (len >= 28) {
1ab1457c 1168 int srcs_offset = sizeof(struct mld2_query) -
97300b5f 1169 sizeof(struct icmp6hdr);
96b52e61 1170 if (!pskb_may_pull(skb, srcs_offset))
97300b5f 1171 return -EINVAL;
96b52e61 1172
9c70220b 1173 mlh2 = (struct mld2_query *)skb_transport_header(skb);
6e7cb837 1174 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1da177e4
LT		 1175 if (!max_delay)
1176 max_delay = 1;
1177 idev->mc_maxdelay = max_delay;
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
1343static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1344{
c346dca1 1345 struct net *net = dev_net(dev);
b8ad0cbc 1346 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1347 struct sk_buff *skb;
1348 struct mld2_report *pmr;
1349 struct in6_addr addr_buf;
d7aabf22 1350 const struct in6_addr *saddr;
a7ae1992
HX		 1351 int hlen = LL_RESERVED_SPACE(dev);
1352 int tlen = dev->needed_tailroom;
1da177e4
LT		 1353 int err;
1354 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1355 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1356 IPV6_TLV_PADN, 0 };
1357
1358 /* we assume size > sizeof(ra) here */
a7ae1992 1359 size += hlen + tlen;
72e09ad1
ED		 1360 /* limit our allocations to order-0 page */
1361 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1362 skb = sock_alloc_send_skb(sk, size, 1, &err);
1da177e4 1363
cfcabdcc 1364 if (!skb)
1da177e4
LT		 1365 return NULL;
1366
a7ae1992 1367 skb_reserve(skb, hlen);
1da177e4 1368
95c385b4 1369 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1370 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1371 * use unspecified address as the source address
1da177e4
LT		 1372 * when a valid link-local address is not available.
1373 */
d7aabf22
YH		 1374 saddr = &in6addr_any;
1375 } else
1376 saddr = &addr_buf;
1da177e4 1377
d7aabf22 1378 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4
LT		 1379
1380 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1381
27a884dc 1382 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1383 skb_put(skb, sizeof(*pmr));
1384 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837
YH		 1385 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1386 pmr->mld2r_resv1 = 0;
1387 pmr->mld2r_cksum = 0;
1388 pmr->mld2r_resv2 = 0;
1389 pmr->mld2r_ngrec = 0;
1da177e4
LT		 1390 return skb;
1391}
1392
1393static void mld_sendpack(struct sk_buff *skb)
1394{
0660e03f 1395 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1396 struct mld2_report *pmr =
1397 (struct mld2_report *)skb_transport_header(skb);
1da177e4 1398 int payload_len, mldlen;
96b52e61 1399 struct inet6_dev *idev;
c346dca1 1400 struct net *net = dev_net(skb->dev);
1da177e4 1401 int err;
4c9483b2 1402 struct flowi6 fl6;
adf30907 1403 struct dst_entry *dst;
1da177e4 1404
96b52e61
ED		 1405 rcu_read_lock();
1406 idev = __in6_dev_get(skb->dev);
edf391ff
NH		 1407 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1408
27a884dc
ACM		 1409 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1410 mldlen = skb->tail - skb->transport_header;
1da177e4
LT		 1411 pip6->payload_len = htons(payload_len);
1412
6e7cb837
YH		 1413 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1414 IPPROTO_ICMPV6,
1415 csum_partial(skb_transport_header(skb),
1416 mldlen, 0));
41927178 1417
4c9483b2 1418 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
41927178
YH		 1419 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1420 skb->dev->ifindex);
87a11578 1421 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
41927178 1422
452edd59
DM		 1423 err = 0;
1424 if (IS_ERR(dst)) {
1425 err = PTR_ERR(dst);
1426 dst = NULL;
1427 }
adf30907 1428 skb_dst_set(skb, dst);
41927178
YH		 1429 if (err)
1430 goto err_out;
1431
edf391ff
NH		 1432 payload_len = skb->len;
1433
b2e0b385 1434 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1435 dst_output);
1436out:
1da177e4 1437 if (!err) {
5a57d4c7 1438 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
e41b5368 1439 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1440 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1da177e4 1441 } else
483a47d2 1442 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 1443
96b52e61 1444 rcu_read_unlock();
41927178
YH		 1445 return;
1446
1447err_out:
1448 kfree_skb(skb);
1449 goto out;
1da177e4
LT		 1450}
1451
1452static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1453{
fab10fe3 1454 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1455}
1456
1457static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1458 int type, struct mld2_grec **ppgr)
1459{
1460 struct net_device *dev = pmc->idev->dev;
1461 struct mld2_report *pmr;
1462 struct mld2_grec *pgr;
1463
1464 if (!skb)
1465 skb = mld_newpack(dev, dev->mtu);
1466 if (!skb)
1467 return NULL;
1468 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1469 pgr->grec_type = type;
1470 pgr->grec_auxwords = 0;
1471 pgr->grec_nsrcs = 0;
1472 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1473 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837 1474 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1da177e4
LT		 1475 *ppgr = pgr;
1476 return skb;
1477}
1478
1479#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1480 skb_tailroom(skb)) : 0)
1481
1482static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1483 int type, int gdeleted, int sdeleted)
1484{
1485 struct net_device *dev = pmc->idev->dev;
1486 struct mld2_report *pmr;
1487 struct mld2_grec *pgr = NULL;
1488 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1489 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1490
1491 if (pmc->mca_flags & MAF_NOREPORT)
1492 return skb;
1493
1494 isquery = type == MLD2_MODE_IS_INCLUDE ||
1495 type == MLD2_MODE_IS_EXCLUDE;
1496 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1497 type == MLD2_CHANGE_TO_EXCLUDE;
1498
5ab4a6c8
DS		 1499 stotal = scount = 0;
1500
1da177e4
LT		 1501 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1502
5ab4a6c8
DS		 1503 if (!*psf_list)
1504 goto empty_source;
1505
9c70220b 1506 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1507
1508 /* EX and TO_EX get a fresh packet, if needed */
1509 if (truncate) {
6e7cb837 1510 if (pmr && pmr->mld2r_ngrec &&
1da177e4
LT		 1511 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1512 if (skb)
1513 mld_sendpack(skb);
1514 skb = mld_newpack(dev, dev->mtu);
1515 }
1516 }
1517 first = 1;
1da177e4
LT		 1518 psf_prev = NULL;
1519 for (psf=*psf_list; psf; psf=psf_next) {
1520 struct in6_addr *psrc;
1521
1522 psf_next = psf->sf_next;
1523
1524 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1525 psf_prev = psf;
1526 continue;
1527 }
1528
1529 /* clear marks on query responses */
1530 if (isquery)
1531 psf->sf_gsresp = 0;
1532
1533 if (AVAILABLE(skb) < sizeof(*psrc) +
1534 first*sizeof(struct mld2_grec)) {
1535 if (truncate && !first)
1536 break; /* truncate these */
1537 if (pgr)
1538 pgr->grec_nsrcs = htons(scount);
1539 if (skb)
1540 mld_sendpack(skb);
1541 skb = mld_newpack(dev, dev->mtu);
1542 first = 1;
1543 scount = 0;
1544 }
1545 if (first) {
1546 skb = add_grhead(skb, pmc, type, &pgr);
1547 first = 0;
1548 }
cc63f70b
AD		 1549 if (!skb)
1550 return NULL;
1da177e4
LT		 1551 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1552 *psrc = psf->sf_addr;
5ab4a6c8 1553 scount++; stotal++;
1da177e4
LT		 1554 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1555 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1556 psf->sf_crcount--;
1557 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1558 if (psf_prev)
1559 psf_prev->sf_next = psf->sf_next;
1560 else
1561 *psf_list = psf->sf_next;
1562 kfree(psf);
1563 continue;
1564 }
1565 }
1566 psf_prev = psf;
1567 }
5ab4a6c8
DS		 1568
1569empty_source:
1570 if (!stotal) {
1571 if (type == MLD2_ALLOW_NEW_SOURCES ||
1572 type == MLD2_BLOCK_OLD_SOURCES)
1573 return skb;
1574 if (pmc->mca_crcount || isquery) {
1575 /* make sure we have room for group header */
1576 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1577 mld_sendpack(skb);
1578 skb = NULL; /* add_grhead will get a new one */
1579 }
1580 skb = add_grhead(skb, pmc, type, &pgr);
1581 }
1582 }
1da177e4
LT		 1583 if (pgr)
1584 pgr->grec_nsrcs = htons(scount);
1585
1586 if (isquery)
1587 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1588 return skb;
1589}
1590
1591static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1592{
1593 struct sk_buff *skb = NULL;
1594 int type;
1595
1596 if (!pmc) {
1597 read_lock_bh(&idev->lock);
1598 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1599 if (pmc->mca_flags & MAF_NOREPORT)
1600 continue;
1601 spin_lock_bh(&pmc->mca_lock);
1602 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1603 type = MLD2_MODE_IS_EXCLUDE;
1604 else
1605 type = MLD2_MODE_IS_INCLUDE;
1606 skb = add_grec(skb, pmc, type, 0, 0);
1607 spin_unlock_bh(&pmc->mca_lock);
1608 }
1609 read_unlock_bh(&idev->lock);
1610 } else {
1611 spin_lock_bh(&pmc->mca_lock);
1612 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1613 type = MLD2_MODE_IS_EXCLUDE;
1614 else
1615 type = MLD2_MODE_IS_INCLUDE;
1616 skb = add_grec(skb, pmc, type, 0, 0);
1617 spin_unlock_bh(&pmc->mca_lock);
1618 }
1619 if (skb)
1620 mld_sendpack(skb);
1621}
1622
1623/*
1624 * remove zero-count source records from a source filter list
1625 */
1626static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1627{
1628 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1629
1630 psf_prev = NULL;
1631 for (psf=*ppsf; psf; psf = psf_next) {
1632 psf_next = psf->sf_next;
1633 if (psf->sf_crcount == 0) {
1634 if (psf_prev)
1635 psf_prev->sf_next = psf->sf_next;
1636 else
1637 *ppsf = psf->sf_next;
1638 kfree(psf);
1639 } else
1640 psf_prev = psf;
1641 }
1642}
1643
1644static void mld_send_cr(struct inet6_dev *idev)
1645{
1646 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1647 struct sk_buff *skb = NULL;
1648 int type, dtype;
1649
1650 read_lock_bh(&idev->lock);
6457d26b 1651 spin_lock(&idev->mc_lock);
1da177e4
LT		 1652
1653 /* deleted MCA's */
1654 pmc_prev = NULL;
1655 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1656 pmc_next = pmc->next;
1657 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1658 type = MLD2_BLOCK_OLD_SOURCES;
1659 dtype = MLD2_BLOCK_OLD_SOURCES;
1660 skb = add_grec(skb, pmc, type, 1, 0);
1661 skb = add_grec(skb, pmc, dtype, 1, 1);
1662 }
1663 if (pmc->mca_crcount) {
1da177e4
LT		 1664 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1665 type = MLD2_CHANGE_TO_INCLUDE;
1666 skb = add_grec(skb, pmc, type, 1, 0);
1667 }
5ab4a6c8 1668 pmc->mca_crcount--;
1da177e4
LT		 1669 if (pmc->mca_crcount == 0) {
1670 mld_clear_zeros(&pmc->mca_tomb);
1671 mld_clear_zeros(&pmc->mca_sources);
1672 }
1673 }
1674 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1675 !pmc->mca_sources) {
1676 if (pmc_prev)
1677 pmc_prev->next = pmc_next;
1678 else
1679 idev->mc_tomb = pmc_next;
1680 in6_dev_put(pmc->idev);
1681 kfree(pmc);
1682 } else
1683 pmc_prev = pmc;
1684 }
6457d26b 1685 spin_unlock(&idev->mc_lock);
1da177e4
LT		 1686
1687 /* change recs */
1688 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1689 spin_lock_bh(&pmc->mca_lock);
1690 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1691 type = MLD2_BLOCK_OLD_SOURCES;
1692 dtype = MLD2_ALLOW_NEW_SOURCES;
1693 } else {
1694 type = MLD2_ALLOW_NEW_SOURCES;
1695 dtype = MLD2_BLOCK_OLD_SOURCES;
1696 }
1697 skb = add_grec(skb, pmc, type, 0, 0);
1698 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1699
1700 /* filter mode changes */
1701 if (pmc->mca_crcount) {
1da177e4
LT		 1702 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1703 type = MLD2_CHANGE_TO_EXCLUDE;
1704 else
1705 type = MLD2_CHANGE_TO_INCLUDE;
1706 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1707 pmc->mca_crcount--;
1da177e4
LT		 1708 }
1709 spin_unlock_bh(&pmc->mca_lock);
1710 }
1711 read_unlock_bh(&idev->lock);
1712 if (!skb)
1713 return;
1714 (void) mld_sendpack(skb);
1715}
1716
1717static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1718{
c346dca1 1719 struct net *net = dev_net(dev);
b8ad0cbc 1720 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1721 struct inet6_dev *idev;
1ab1457c 1722 struct sk_buff *skb;
6e7cb837 1723 struct mld_msg *hdr;
d7aabf22 1724 const struct in6_addr *snd_addr, *saddr;
1da177e4 1725 struct in6_addr addr_buf;
a7ae1992
HX		 1726 int hlen = LL_RESERVED_SPACE(dev);
1727 int tlen = dev->needed_tailroom;
1da177e4
LT		 1728 int err, len, payload_len, full_len;
1729 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1730 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1731 IPV6_TLV_PADN, 0 };
4c9483b2 1732 struct flowi6 fl6;
adf30907 1733 struct dst_entry *dst;
1da177e4 1734
f3ee4010
YH		 1735 if (type == ICMPV6_MGM_REDUCTION)
1736 snd_addr = &in6addr_linklocal_allrouters;
1737 else
1738 snd_addr = addr;
1da177e4
LT		 1739
1740 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1741 payload_len = len + sizeof(ra);
1742 full_len = sizeof(struct ipv6hdr) + payload_len;
1743
edf391ff
NH		 1744 rcu_read_lock();
1745 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1746 IPSTATS_MIB_OUT, full_len);
1747 rcu_read_unlock();
1748
a7ae1992 1749 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1da177e4
LT		 1750
1751 if (skb == NULL) {
a11d206d 1752 rcu_read_lock();
3bd653c8 1753 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH		 1754 IPSTATS_MIB_OUTDISCARDS);
1755 rcu_read_unlock();
1da177e4
LT		 1756 return;
1757 }
1758
a7ae1992 1759 skb_reserve(skb, hlen);
1da177e4 1760
95c385b4 1761 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1762 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1763 * use unspecified address as the source address
1da177e4
LT		 1764 * when a valid link-local address is not available.
1765 */
d7aabf22
YH		 1766 saddr = &in6addr_any;
1767 } else
1768 saddr = &addr_buf;
1da177e4 1769
d7aabf22 1770 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4
LT		 1771
1772 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1773
6e7cb837
YH		 1774 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1775 memset(hdr, 0, sizeof(struct mld_msg));
1776 hdr->mld_type = type;
4e3fd7a0 1777 hdr->mld_mca = *addr;
1da177e4 1778
6e7cb837
YH		 1779 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1780 IPPROTO_ICMPV6,
1781 csum_partial(hdr, len, 0));
1da177e4 1782
96b52e61
ED		 1783 rcu_read_lock();
1784 idev = __in6_dev_get(skb->dev);
1da177e4 1785
4c9483b2 1786 icmpv6_flow_init(sk, &fl6, type,
41927178
YH		 1787 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1788 skb->dev->ifindex);
87a11578 1789 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
452edd59
DM		 1790 if (IS_ERR(dst)) {
1791 err = PTR_ERR(dst);
41927178 1792 goto err_out;
452edd59 1793 }
41927178 1794
adf30907 1795 skb_dst_set(skb, dst);
b2e0b385 1796 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1797 dst_output);
1798out:
1da177e4 1799 if (!err) {
5c5d244b 1800 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 1801 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1802 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1da177e4 1803 } else
3bd653c8 1804 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 1805
96b52e61 1806 rcu_read_unlock();
1da177e4 1807 return;
41927178
YH		 1808
1809err_out:
1810 kfree_skb(skb);
1811 goto out;
1da177e4
LT		 1812}
1813
1814static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
b71d1d42 1815 const struct in6_addr *psfsrc)
1da177e4
LT		 1816{
1817 struct ip6_sf_list *psf, *psf_prev;
1818 int rv = 0;
1819
1820 psf_prev = NULL;
1821 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1822 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1823 break;
1824 psf_prev = psf;
1825 }
1826 if (!psf || psf->sf_count[sfmode] == 0) {
1827 /* source filter not found, or count wrong => bug */
1828 return -ESRCH;
1829 }
1830 psf->sf_count[sfmode]--;
1831 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1832 struct inet6_dev *idev = pmc->idev;
1833
1834 /* no more filters for this source */
1835 if (psf_prev)
1836 psf_prev->sf_next = psf->sf_next;
1837 else
1838 pmc->mca_sources = psf->sf_next;
1839 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1840 !MLD_V1_SEEN(idev)) {
1841 psf->sf_crcount = idev->mc_qrv;
1842 psf->sf_next = pmc->mca_tomb;
1843 pmc->mca_tomb = psf;
1844 rv = 1;
1845 } else
1846 kfree(psf);
1847 }
1848 return rv;
1849}
1850
b71d1d42
ED		 1851static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1852 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 1853 int delta)
1854{
1855 struct ifmcaddr6 *pmc;
1856 int changerec = 0;
1857 int i, err;
1858
1859 if (!idev)
1860 return -ENODEV;
1861 read_lock_bh(&idev->lock);
1862 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1863 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1864 break;
1865 }
1866 if (!pmc) {
1867 /* MCA not found?? bug */
1868 read_unlock_bh(&idev->lock);
1869 return -ESRCH;
1870 }
1871 spin_lock_bh(&pmc->mca_lock);
1872 sf_markstate(pmc);
1873 if (!delta) {
1874 if (!pmc->mca_sfcount[sfmode]) {
1875 spin_unlock_bh(&pmc->mca_lock);
1876 read_unlock_bh(&idev->lock);
1877 return -EINVAL;
1878 }
1879 pmc->mca_sfcount[sfmode]--;
1880 }
1881 err = 0;
1882 for (i=0; i<sfcount; i++) {
1883 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1884
1885 changerec |= rv > 0;
1886 if (!err && rv < 0)
1887 err = rv;
1888 }
1889 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1890 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1891 pmc->mca_sfcount[MCAST_INCLUDE]) {
1892 struct ip6_sf_list *psf;
1893
1894 /* filter mode change */
1895 pmc->mca_sfmode = MCAST_INCLUDE;
1896 pmc->mca_crcount = idev->mc_qrv;
1897 idev->mc_ifc_count = pmc->mca_crcount;
1898 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1899 psf->sf_crcount = 0;
1900 mld_ifc_event(pmc->idev);
1901 } else if (sf_setstate(pmc) || changerec)
1902 mld_ifc_event(pmc->idev);
1903 spin_unlock_bh(&pmc->mca_lock);
1904 read_unlock_bh(&idev->lock);
1905 return err;
1906}
1907
1908/*
1909 * Add multicast single-source filter to the interface list
1910 */
1911static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
99d2f47a 1912 const struct in6_addr *psfsrc)
1da177e4
LT		 1913{
1914 struct ip6_sf_list *psf, *psf_prev;
1915
1916 psf_prev = NULL;
1917 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1918 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1919 break;
1920 psf_prev = psf;
1921 }
1922 if (!psf) {
0c600eda 1923 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1924 if (!psf)
1925 return -ENOBUFS;
0c600eda 1926
1da177e4
LT		 1927 psf->sf_addr = *psfsrc;
1928 if (psf_prev) {
1929 psf_prev->sf_next = psf;
1930 } else
1931 pmc->mca_sources = psf;
1932 }
1933 psf->sf_count[sfmode]++;
1934 return 0;
1935}
1936
1937static void sf_markstate(struct ifmcaddr6 *pmc)
1938{
1939 struct ip6_sf_list *psf;
1940 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1941
1942 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1943 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1944 psf->sf_oldin = mca_xcount ==
1945 psf->sf_count[MCAST_EXCLUDE] &&
1946 !psf->sf_count[MCAST_INCLUDE];
1947 } else
1948 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1949}
1950
1951static int sf_setstate(struct ifmcaddr6 *pmc)
1952{
7add2a43 1953 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 1954 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1955 int qrv = pmc->idev->mc_qrv;
1956 int new_in, rv;
1957
1958 rv = 0;
1959 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1960 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1961 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1962 !psf->sf_count[MCAST_INCLUDE];
1963 } else
1964 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 1965 if (new_in) {
1966 if (!psf->sf_oldin) {
e80e28b6 1967 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 1968
1969 for (dpsf=pmc->mca_tomb; dpsf;
1970 dpsf=dpsf->sf_next) {
1971 if (ipv6_addr_equal(&dpsf->sf_addr,
1972 &psf->sf_addr))
1973 break;
1974 prev = dpsf;
1975 }
1976 if (dpsf) {
1977 if (prev)
1978 prev->sf_next = dpsf->sf_next;
1979 else
1980 pmc->mca_tomb = dpsf->sf_next;
1981 kfree(dpsf);
1982 }
1983 psf->sf_crcount = qrv;
1984 rv++;
1985 }
1986 } else if (psf->sf_oldin) {
1987 psf->sf_crcount = 0;
1988 /*
1989 * add or update "delete" records if an active filter
1990 * is now inactive
1991 */
1992 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1993 if (ipv6_addr_equal(&dpsf->sf_addr,
1994 &psf->sf_addr))
1995 break;
1996 if (!dpsf) {
5d55354f 1997 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
7add2a43
DS		 1998 if (!dpsf)
1999 continue;
2000 *dpsf = *psf;
2001 /* pmc->mca_lock held by callers */
2002 dpsf->sf_next = pmc->mca_tomb;
2003 pmc->mca_tomb = dpsf;
2004 }
2005 dpsf->sf_crcount = qrv;
1da177e4
LT		 2006 rv++;
2007 }
2008 }
2009 return rv;
2010}
2011
2012/*
2013 * Add multicast source filter list to the interface list
2014 */
b71d1d42
ED		 2015static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2016 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 2017 int delta)
2018{
2019 struct ifmcaddr6 *pmc;
2020 int isexclude;
2021 int i, err;
2022
2023 if (!idev)
2024 return -ENODEV;
2025 read_lock_bh(&idev->lock);
2026 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2027 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2028 break;
2029 }
2030 if (!pmc) {
2031 /* MCA not found?? bug */
2032 read_unlock_bh(&idev->lock);
2033 return -ESRCH;
2034 }
2035 spin_lock_bh(&pmc->mca_lock);
2036
2037 sf_markstate(pmc);
2038 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2039 if (!delta)
2040 pmc->mca_sfcount[sfmode]++;
2041 err = 0;
2042 for (i=0; i<sfcount; i++) {
99d2f47a 2043 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT		 2044 if (err)
2045 break;
2046 }
2047 if (err) {
2048 int j;
2049
2050 if (!delta)
2051 pmc->mca_sfcount[sfmode]--;
2052 for (j=0; j<i; j++)
78d50217 2053 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4 2054 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT		 2055 struct ip6_sf_list *psf;
2056
2057 /* filter mode change */
2058 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2059 pmc->mca_sfmode = MCAST_EXCLUDE;
2060 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2061 pmc->mca_sfmode = MCAST_INCLUDE;
2062 /* else no filters; keep old mode for reports */
2063
2064 pmc->mca_crcount = idev->mc_qrv;
2065 idev->mc_ifc_count = pmc->mca_crcount;
2066 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2067 psf->sf_crcount = 0;
2068 mld_ifc_event(idev);
2069 } else if (sf_setstate(pmc))
2070 mld_ifc_event(idev);
2071 spin_unlock_bh(&pmc->mca_lock);
2072 read_unlock_bh(&idev->lock);
2073 return err;
2074}
2075
2076static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2077{
2078 struct ip6_sf_list *psf, *nextpsf;
2079
2080 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2081 nextpsf = psf->sf_next;
2082 kfree(psf);
2083 }
2084 pmc->mca_tomb = NULL;
2085 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2086 nextpsf = psf->sf_next;
2087 kfree(psf);
2088 }
2089 pmc->mca_sources = NULL;
2090 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2091 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2092 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2093}
2094
2095
2096static void igmp6_join_group(struct ifmcaddr6 *ma)
2097{
2098 unsigned long delay;
2099
2100 if (ma->mca_flags & MAF_NOREPORT)
2101 return;
2102
2103 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2104
2105 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2106
2107 spin_lock_bh(&ma->mca_lock);
2108 if (del_timer(&ma->mca_timer)) {
2109 atomic_dec(&ma->mca_refcnt);
2110 delay = ma->mca_timer.expires - jiffies;
2111 }
2112
2113 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2114 atomic_inc(&ma->mca_refcnt);
2115 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2116 spin_unlock_bh(&ma->mca_lock);
2117}
2118
2119static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2120 struct inet6_dev *idev)
2121{
2122 int err;
2123
5ab4a6c8
DS		 2124 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2125 * so no other readers or writers of iml or its sflist
2126 */
cfcabdcc 2127 if (!iml->sflist) {
1da177e4
LT		 2128 /* any-source empty exclude case */
2129 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2130 }
2131 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2132 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2133 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2134 iml->sflist = NULL;
2135 return err;
2136}
2137
2138static void igmp6_leave_group(struct ifmcaddr6 *ma)
2139{
2140 if (MLD_V1_SEEN(ma->idev)) {
2141 if (ma->mca_flags & MAF_LAST_REPORTER)
2142 igmp6_send(&ma->mca_addr, ma->idev->dev,
2143 ICMPV6_MGM_REDUCTION);
2144 } else {
2145 mld_add_delrec(ma->idev, ma);
2146 mld_ifc_event(ma->idev);
2147 }
2148}
2149
2150static void mld_gq_timer_expire(unsigned long data)
2151{
2152 struct inet6_dev *idev = (struct inet6_dev *)data;
2153
2154 idev->mc_gq_running = 0;
2155 mld_send_report(idev, NULL);
2156 __in6_dev_put(idev);
2157}
2158
2159static void mld_ifc_timer_expire(unsigned long data)
2160{
2161 struct inet6_dev *idev = (struct inet6_dev *)data;
2162
2163 mld_send_cr(idev);
2164 if (idev->mc_ifc_count) {
2165 idev->mc_ifc_count--;
2166 if (idev->mc_ifc_count)
2167 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2168 }
2169 __in6_dev_put(idev);
2170}
2171
2172static void mld_ifc_event(struct inet6_dev *idev)
2173{
2174 if (MLD_V1_SEEN(idev))
2175 return;
2176 idev->mc_ifc_count = idev->mc_qrv;
2177 mld_ifc_start_timer(idev, 1);
2178}
2179
2180
2181static void igmp6_timer_handler(unsigned long data)
2182{
2183 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2184
2185 if (MLD_V1_SEEN(ma->idev))
2186 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2187 else
2188 mld_send_report(ma->idev, ma);
2189
2190 spin_lock(&ma->mca_lock);
2191 ma->mca_flags |= MAF_LAST_REPORTER;
2192 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2193 spin_unlock(&ma->mca_lock);
2194 ma_put(ma);
2195}
2196
75c78500
MS		 2197/* Device changing type */
2198
2199void ipv6_mc_unmap(struct inet6_dev *idev)
2200{
2201 struct ifmcaddr6 *i;
2202
2203 /* Install multicast list, except for all-nodes (already installed) */
2204
2205 read_lock_bh(&idev->lock);
2206 for (i = idev->mc_list; i; i = i->next)
2207 igmp6_group_dropped(i);
2208 read_unlock_bh(&idev->lock);
2209}
2210
2211void ipv6_mc_remap(struct inet6_dev *idev)
2212{
2213 ipv6_mc_up(idev);
2214}
2215
1da177e4
LT		 2216/* Device going down */
2217
2218void ipv6_mc_down(struct inet6_dev *idev)
2219{
2220 struct ifmcaddr6 *i;
2221
2222 /* Withdraw multicast list */
2223
2224 read_lock_bh(&idev->lock);
2225 idev->mc_ifc_count = 0;
2226 if (del_timer(&idev->mc_ifc_timer))
2227 __in6_dev_put(idev);
2228 idev->mc_gq_running = 0;
2229 if (del_timer(&idev->mc_gq_timer))
2230 __in6_dev_put(idev);
2231
2232 for (i = idev->mc_list; i; i=i->next)
2233 igmp6_group_dropped(i);
2234 read_unlock_bh(&idev->lock);
2235
2236 mld_clear_delrec(idev);
2237}
2238
2239
2240/* Device going up */
2241
2242void ipv6_mc_up(struct inet6_dev *idev)
2243{
2244 struct ifmcaddr6 *i;
2245
2246 /* Install multicast list, except for all-nodes (already installed) */
2247
2248 read_lock_bh(&idev->lock);
2249 for (i = idev->mc_list; i; i=i->next)
2250 igmp6_group_added(i);
2251 read_unlock_bh(&idev->lock);
2252}
2253
2254/* IPv6 device initialization. */
2255
2256void ipv6_mc_init_dev(struct inet6_dev *idev)
2257{
1da177e4 2258 write_lock_bh(&idev->lock);
6457d26b 2259 spin_lock_init(&idev->mc_lock);
1da177e4 2260 idev->mc_gq_running = 0;
b24b8a24
PE		 2261 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2262 (unsigned long)idev);
1da177e4
LT		 2263 idev->mc_tomb = NULL;
2264 idev->mc_ifc_count = 0;
b24b8a24
PE		 2265 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2266 (unsigned long)idev);
1da177e4
LT		 2267 idev->mc_qrv = MLD_QRV_DEFAULT;
2268 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2269 idev->mc_v1_seen = 0;
2270 write_unlock_bh(&idev->lock);
1da177e4
LT		 2271}
2272
2273/*
2274 * Device is about to be destroyed: clean up.
2275 */
2276
2277void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2278{
2279 struct ifmcaddr6 *i;
1da177e4
LT		 2280
2281 /* Deactivate timers */
2282 ipv6_mc_down(idev);
2283
2284 /* Delete all-nodes address. */
1da177e4
LT		 2285 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2286 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2287 * fail.
2288 */
f3ee4010 2289 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2290
f3ee4010
YH		 2291 if (idev->cnf.forwarding)
2292 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT		 2293
2294 write_lock_bh(&idev->lock);
2295 while ((i = idev->mc_list) != NULL) {
2296 idev->mc_list = i->next;
2297 write_unlock_bh(&idev->lock);
2298
2299 igmp6_group_dropped(i);
2300 ma_put(i);
2301
2302 write_lock_bh(&idev->lock);
2303 }
2304 write_unlock_bh(&idev->lock);
2305}
2306
2307#ifdef CONFIG_PROC_FS
2308struct igmp6_mc_iter_state {
b8ad0cbc 2309 struct seq_net_private p;
1da177e4
LT		 2310 struct net_device *dev;
2311 struct inet6_dev *idev;
2312};
2313
2314#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2315
2316static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2317{
2318 struct ifmcaddr6 *im = NULL;
2319 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2320 struct net *net = seq_file_net(seq);
1da177e4 2321
7562f876 2322 state->idev = NULL;
ce81b76a 2323 for_each_netdev_rcu(net, state->dev) {
1da177e4 2324 struct inet6_dev *idev;
ce81b76a 2325 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2326 if (!idev)
2327 continue;
2328 read_lock_bh(&idev->lock);
2329 im = idev->mc_list;
2330 if (im) {
2331 state->idev = idev;
2332 break;
2333 }
2334 read_unlock_bh(&idev->lock);
1da177e4
LT		 2335 }
2336 return im;
2337}
2338
2339static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2340{
2341 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2342
2343 im = im->next;
2344 while (!im) {
ce81b76a 2345 if (likely(state->idev != NULL))
1da177e4 2346 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2347
2348 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2349 if (!state->dev) {
2350 state->idev = NULL;
2351 break;
2352 }
ce81b76a 2353 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2354 if (!state->idev)
2355 continue;
2356 read_lock_bh(&state->idev->lock);
2357 im = state->idev->mc_list;
2358 }
2359 return im;
2360}
2361
2362static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2363{
2364 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2365 if (im)
2366 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2367 --pos;
2368 return pos ? NULL : im;
2369}
2370
2371static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2372 __acquires(RCU)
1da177e4 2373{
ce81b76a 2374 rcu_read_lock();
1da177e4
LT		 2375 return igmp6_mc_get_idx(seq, *pos);
2376}
2377
2378static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2379{
ce81b76a
ED		 2380 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2381
1da177e4
LT		 2382 ++*pos;
2383 return im;
2384}
2385
2386static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2387 __releases(RCU)
1da177e4
LT		 2388{
2389 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2390
1da177e4
LT		 2391 if (likely(state->idev != NULL)) {
2392 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2393 state->idev = NULL;
2394 }
2395 state->dev = NULL;
ce81b76a 2396 rcu_read_unlock();
1da177e4
LT		 2397}
2398
2399static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2400{
2401 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2402 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2403
2404 seq_printf(seq,
4b7a4274 2405 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2406 state->dev->ifindex, state->dev->name,
b071195d 2407 &im->mca_addr,
1da177e4
LT		 2408 im->mca_users, im->mca_flags,
2409 (im->mca_flags&MAF_TIMER_RUNNING) ?
2410 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2411 return 0;
2412}
2413
56b3d975 2414static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2415 .start = igmp6_mc_seq_start,
2416 .next = igmp6_mc_seq_next,
2417 .stop = igmp6_mc_seq_stop,
2418 .show = igmp6_mc_seq_show,
2419};
2420
2421static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2422{
b8ad0cbc
DL		 2423 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2424 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2425}
2426
9a32144e 2427static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2428 .owner = THIS_MODULE,
2429 .open = igmp6_mc_seq_open,
2430 .read = seq_read,
2431 .llseek = seq_lseek,
b8ad0cbc 2432 .release = seq_release_net,
1da177e4
LT		 2433};
2434
2435struct igmp6_mcf_iter_state {
b8ad0cbc 2436 struct seq_net_private p;
1da177e4
LT		 2437 struct net_device *dev;
2438 struct inet6_dev *idev;
2439 struct ifmcaddr6 *im;
2440};
2441
2442#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2443
2444static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2445{
2446 struct ip6_sf_list *psf = NULL;
2447 struct ifmcaddr6 *im = NULL;
2448 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2449 struct net *net = seq_file_net(seq);
1da177e4 2450
7562f876
PE		 2451 state->idev = NULL;
2452 state->im = NULL;
ce81b76a 2453 for_each_netdev_rcu(net, state->dev) {
1da177e4 2454 struct inet6_dev *idev;
ce81b76a 2455 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2456 if (unlikely(idev == NULL))
2457 continue;
2458 read_lock_bh(&idev->lock);
2459 im = idev->mc_list;
2460 if (likely(im != NULL)) {
2461 spin_lock_bh(&im->mca_lock);
2462 psf = im->mca_sources;
2463 if (likely(psf != NULL)) {
2464 state->im = im;
2465 state->idev = idev;
2466 break;
2467 }
2468 spin_unlock_bh(&im->mca_lock);
2469 }
2470 read_unlock_bh(&idev->lock);
1da177e4
LT		 2471 }
2472 return psf;
2473}
2474
2475static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2476{
2477 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2478
2479 psf = psf->sf_next;
2480 while (!psf) {
2481 spin_unlock_bh(&state->im->mca_lock);
2482 state->im = state->im->next;
2483 while (!state->im) {
ce81b76a 2484 if (likely(state->idev != NULL))
1da177e4 2485 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2486
2487 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2488 if (!state->dev) {
2489 state->idev = NULL;
2490 goto out;
2491 }
ce81b76a 2492 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2493 if (!state->idev)
2494 continue;
2495 read_lock_bh(&state->idev->lock);
2496 state->im = state->idev->mc_list;
2497 }
2498 if (!state->im)
2499 break;
2500 spin_lock_bh(&state->im->mca_lock);
2501 psf = state->im->mca_sources;
2502 }
2503out:
2504 return psf;
2505}
2506
2507static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2508{
2509 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2510 if (psf)
2511 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2512 --pos;
2513 return pos ? NULL : psf;
2514}
2515
2516static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2517 __acquires(RCU)
1da177e4 2518{
ce81b76a 2519 rcu_read_lock();
1da177e4
LT		 2520 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2521}
2522
2523static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2524{
2525 struct ip6_sf_list *psf;
2526 if (v == SEQ_START_TOKEN)
2527 psf = igmp6_mcf_get_first(seq);
2528 else
2529 psf = igmp6_mcf_get_next(seq, v);
2530 ++*pos;
2531 return psf;
2532}
2533
2534static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2535 __releases(RCU)
1da177e4
LT		 2536{
2537 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2538 if (likely(state->im != NULL)) {
2539 spin_unlock_bh(&state->im->mca_lock);
2540 state->im = NULL;
2541 }
2542 if (likely(state->idev != NULL)) {
2543 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2544 state->idev = NULL;
2545 }
2546 state->dev = NULL;
ce81b76a 2547 rcu_read_unlock();
1da177e4
LT		 2548}
2549
2550static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2551{
2552 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2553 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2554
2555 if (v == SEQ_START_TOKEN) {
1ab1457c 2556 seq_printf(seq,
1da177e4 2557 "%3s %6s "
9343e79a 2558 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2559 "Device", "Multicast Address",
2560 "Source Address", "INC", "EXC");
2561 } else {
2562 seq_printf(seq,
4b7a4274 2563 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 2564 state->dev->ifindex, state->dev->name,
b071195d
HH		 2565 &state->im->mca_addr,
2566 &psf->sf_addr,
1da177e4
LT		 2567 psf->sf_count[MCAST_INCLUDE],
2568 psf->sf_count[MCAST_EXCLUDE]);
2569 }
2570 return 0;
2571}
2572
56b3d975 2573static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2574 .start = igmp6_mcf_seq_start,
2575 .next = igmp6_mcf_seq_next,
2576 .stop = igmp6_mcf_seq_stop,
2577 .show = igmp6_mcf_seq_show,
2578};
2579
2580static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2581{
b8ad0cbc
DL		 2582 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2583 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2584}
2585
9a32144e 2586static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2587 .owner = THIS_MODULE,
2588 .open = igmp6_mcf_seq_open,
2589 .read = seq_read,
2590 .llseek = seq_lseek,
b8ad0cbc 2591 .release = seq_release_net,
1da177e4 2592};
ea82edf7 2593
2c8c1e72 2594static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL		 2595{
2596 int err;
2597
2598 err = -ENOMEM;
2599 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2600 goto out;
2601 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2602 &igmp6_mcf_seq_fops))
2603 goto out_proc_net_igmp6;
2604
2605 err = 0;
2606out:
2607 return err;
2608
2609out_proc_net_igmp6:
2610 proc_net_remove(net, "igmp6");
2611 goto out;
2612}
2613
2c8c1e72 2614static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7
DL		 2615{
2616 proc_net_remove(net, "mcfilter6");
2617 proc_net_remove(net, "igmp6");
2618}
2619#else
2c8c1e72 2620static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL		 2621{
2622 return 0;
2623}
2c8c1e72 2624static inline void igmp6_proc_exit(struct net *net)
ea82edf7 2625{
ea82edf7 2626}
1da177e4
LT		 2627#endif
2628
2c8c1e72 2629static int __net_init igmp6_net_init(struct net *net)
1da177e4 2630{
1da177e4
LT		 2631 int err;
2632
1ed8516f
DL		 2633 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2634 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4 2635 if (err < 0) {
f3213831 2636 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
1da177e4 2637 err);
b8ad0cbc 2638 goto out;
1da177e4
LT		 2639 }
2640
1ed8516f 2641 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2642
ea82edf7
DL		 2643 err = igmp6_proc_init(net);
2644 if (err)
b8ad0cbc 2645 goto out_sock_create;
b8ad0cbc
DL		 2646out:
2647 return err;
2648
2649out_sock_create:
1ed8516f 2650 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2651 goto out;
1da177e4
LT		 2652}
2653
2c8c1e72 2654static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 2655{
1ed8516f 2656 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2657 igmp6_proc_exit(net);
1da177e4 2658}
b8ad0cbc
DL		 2659
2660static struct pernet_operations igmp6_net_ops = {
2661 .init = igmp6_net_init,
2662 .exit = igmp6_net_exit,
2663};
2664
2665int __init igmp6_init(void)
2666{
2667 return register_pernet_subsys(&igmp6_net_ops);
2668}
2669
2670void igmp6_cleanup(void)
2671{
2672 unregister_pernet_subsys(&igmp6_net_ops);
2673}
Linux 6.x block layer and io_uring tree(s)