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cleanup: remove pppoe_xmit() declaration.
[net-next-2.6.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 */
85static DEFINE_RWLOCK(ipv6_sk_mc_lock);
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);
95static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
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);
100static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
101 int sfmode, int sfcount, struct in6_addr *psfsrc,
102 int delta);
103static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
104 int sfmode, int sfcount, struct in6_addr *psfsrc,
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
9acd9f3a 126int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 127{
128 struct net_device *dev = NULL;
129 struct ipv6_mc_socklist *mc_lst;
130 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 131 struct net *net = sock_net(sk);
1da177e4
LT		 132 int err;
133
134 if (!ipv6_addr_is_multicast(addr))
135 return -EINVAL;
136
c9e3e8b6
DS		 137 read_lock_bh(&ipv6_sk_mc_lock);
138 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
139 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
140 ipv6_addr_equal(&mc_lst->addr, addr)) {
141 read_unlock_bh(&ipv6_sk_mc_lock);
142 return -EADDRINUSE;
143 }
144 }
145 read_unlock_bh(&ipv6_sk_mc_lock);
146
1da177e4
LT		 147 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
148
149 if (mc_lst == NULL)
150 return -ENOMEM;
151
152 mc_lst->next = NULL;
153 ipv6_addr_copy(&mc_lst->addr, addr);
154
155 if (ifindex == 0) {
156 struct rt6_info *rt;
b8ad0cbc 157 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4
LT		 158 if (rt) {
159 dev = rt->rt6i_dev;
160 dev_hold(dev);
161 dst_release(&rt->u.dst);
162 }
163 } else
b8ad0cbc 164 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 165
166 if (dev == NULL) {
167 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
168 return -ENODEV;
169 }
170
171 mc_lst->ifindex = dev->ifindex;
172 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 173 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 174 mc_lst->sflist = NULL;
175
176 /*
177 * now add/increase the group membership on the device
178 */
179
180 err = ipv6_dev_mc_inc(dev, addr);
181
182 if (err) {
183 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
184 dev_put(dev);
185 return err;
186 }
187
188 write_lock_bh(&ipv6_sk_mc_lock);
189 mc_lst->next = np->ipv6_mc_list;
190 np->ipv6_mc_list = mc_lst;
191 write_unlock_bh(&ipv6_sk_mc_lock);
192
193 dev_put(dev);
194
195 return 0;
196}
197
198/*
199 * socket leave on multicast group
200 */
9acd9f3a 201int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 202{
203 struct ipv6_pinfo *np = inet6_sk(sk);
204 struct ipv6_mc_socklist *mc_lst, **lnk;
3b1e0a65 205 struct net *net = sock_net(sk);
1da177e4
LT		 206
207 write_lock_bh(&ipv6_sk_mc_lock);
208 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
209 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
210 ipv6_addr_equal(&mc_lst->addr, addr)) {
211 struct net_device *dev;
212
213 *lnk = mc_lst->next;
214 write_unlock_bh(&ipv6_sk_mc_lock);
215
b8ad0cbc
DL		 216 dev = dev_get_by_index(net, mc_lst->ifindex);
217 if (dev != NULL) {
1da177e4
LT		 218 struct inet6_dev *idev = in6_dev_get(dev);
219
acd6e00b 220 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 221 if (idev) {
1da177e4
LT		 222 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
223 in6_dev_put(idev);
224 }
225 dev_put(dev);
acd6e00b
DS		 226 } else
227 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 228 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
229 return 0;
230 }
231 }
232 write_unlock_bh(&ipv6_sk_mc_lock);
233
9951f036 234 return -EADDRNOTAVAIL;
1da177e4
LT		 235}
236
b8ad0cbc
DL		 237static struct inet6_dev *ip6_mc_find_dev(struct net *net,
238 struct in6_addr *group,
239 int ifindex)
1da177e4
LT		 240{
241 struct net_device *dev = NULL;
242 struct inet6_dev *idev = NULL;
243
244 if (ifindex == 0) {
245 struct rt6_info *rt;
246
b8ad0cbc 247 rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4
LT		 248 if (rt) {
249 dev = rt->rt6i_dev;
250 dev_hold(dev);
251 dst_release(&rt->u.dst);
252 }
253 } else
b8ad0cbc 254 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 255
256 if (!dev)
448eb71f 257 goto nodev;
1da177e4 258 idev = in6_dev_get(dev);
448eb71f
IJ		 259 if (!idev)
260 goto release;
1da177e4 261 read_lock_bh(&idev->lock);
448eb71f
IJ		 262 if (idev->dead)
263 goto unlock_release;
264
1da177e4 265 return idev;
448eb71f
IJ		 266
267unlock_release:
268 read_unlock_bh(&idev->lock);
269 in6_dev_put(idev);
270release:
271 dev_put(dev);
272nodev:
273 return NULL;
1da177e4
LT		 274}
275
276void ipv6_sock_mc_close(struct sock *sk)
277{
278 struct ipv6_pinfo *np = inet6_sk(sk);
279 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 280 struct net *net = sock_net(sk);
1da177e4
LT		 281
282 write_lock_bh(&ipv6_sk_mc_lock);
283 while ((mc_lst = np->ipv6_mc_list) != NULL) {
284 struct net_device *dev;
285
286 np->ipv6_mc_list = mc_lst->next;
287 write_unlock_bh(&ipv6_sk_mc_lock);
288
b8ad0cbc 289 dev = dev_get_by_index(net, mc_lst->ifindex);
1da177e4
LT		 290 if (dev) {
291 struct inet6_dev *idev = in6_dev_get(dev);
292
acd6e00b 293 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 294 if (idev) {
1da177e4
LT		 295 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
296 in6_dev_put(idev);
297 }
298 dev_put(dev);
acd6e00b
DS		 299 } else
300 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 301
302 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
303
304 write_lock_bh(&ipv6_sk_mc_lock);
305 }
306 write_unlock_bh(&ipv6_sk_mc_lock);
307}
308
309int ip6_mc_source(int add, int omode, struct sock *sk,
310 struct group_source_req *pgsr)
311{
312 struct in6_addr *source, *group;
313 struct ipv6_mc_socklist *pmc;
314 struct net_device *dev;
315 struct inet6_dev *idev;
316 struct ipv6_pinfo *inet6 = inet6_sk(sk);
317 struct ip6_sf_socklist *psl;
3b1e0a65 318 struct net *net = sock_net(sk);
1da177e4 319 int i, j, rv;
c9e3e8b6 320 int leavegroup = 0;
5ab4a6c8 321 int pmclocked = 0;
1da177e4
LT		 322 int err;
323
1da177e4
LT		 324 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
325 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
326
327 if (!ipv6_addr_is_multicast(group))
328 return -EINVAL;
329
b8ad0cbc 330 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
1da177e4
LT		 331 if (!idev)
332 return -ENODEV;
333 dev = idev->dev;
334
335 err = -EADDRNOTAVAIL;
336
c9e3e8b6 337 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 338 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
339 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
340 continue;
341 if (ipv6_addr_equal(&pmc->addr, group))
342 break;
343 }
917f2f10
DS		 344 if (!pmc) { /* must have a prior join */
345 err = -EINVAL;
1da177e4 346 goto done;
917f2f10 347 }
1da177e4
LT		 348 /* if a source filter was set, must be the same mode as before */
349 if (pmc->sflist) {
917f2f10
DS		 350 if (pmc->sfmode != omode) {
351 err = -EINVAL;
1da177e4 352 goto done;
917f2f10 353 }
1da177e4
LT		 354 } else if (pmc->sfmode != omode) {
355 /* allow mode switches for empty-set filters */
356 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
357 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
358 pmc->sfmode = omode;
359 }
360
5ab4a6c8
DS		 361 write_lock_bh(&pmc->sflock);
362 pmclocked = 1;
363
1da177e4
LT		 364 psl = pmc->sflist;
365 if (!add) {
366 if (!psl)
917f2f10 367 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 368 rv = !0;
369 for (i=0; i<psl->sl_count; i++) {
370 rv = memcmp(&psl->sl_addr[i], source,
371 sizeof(struct in6_addr));
372 if (rv == 0)
373 break;
374 }
375 if (rv) /* source not found */
917f2f10 376 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 377
c9e3e8b6
DS		 378 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
379 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
380 leavegroup = 1;
381 goto done;
382 }
383
1da177e4
LT		 384 /* update the interface filter */
385 ip6_mc_del_src(idev, group, omode, 1, source, 1);
386
387 for (j=i+1; j<psl->sl_count; j++)
388 psl->sl_addr[j-1] = psl->sl_addr[j];
389 psl->sl_count--;
390 err = 0;
391 goto done;
392 }
393 /* else, add a new source to the filter */
394
395 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
396 err = -ENOBUFS;
397 goto done;
398 }
399 if (!psl || psl->sl_count == psl->sl_max) {
400 struct ip6_sf_socklist *newpsl;
401 int count = IP6_SFBLOCK;
402
403 if (psl)
404 count += psl->sl_max;
8b3a7005 405 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 406 if (!newpsl) {
407 err = -ENOBUFS;
408 goto done;
409 }
410 newpsl->sl_max = count;
411 newpsl->sl_count = count - IP6_SFBLOCK;
412 if (psl) {
413 for (i=0; i<psl->sl_count; i++)
414 newpsl->sl_addr[i] = psl->sl_addr[i];
415 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
416 }
417 pmc->sflist = psl = newpsl;
418 }
419 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
420 for (i=0; i<psl->sl_count; i++) {
421 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
422 if (rv == 0)
423 break;
424 }
425 if (rv == 0) /* address already there is an error */
426 goto done;
427 for (j=psl->sl_count-1; j>=i; j--)
428 psl->sl_addr[j+1] = psl->sl_addr[j];
429 psl->sl_addr[i] = *source;
430 psl->sl_count++;
431 err = 0;
432 /* update the interface list */
433 ip6_mc_add_src(idev, group, omode, 1, source, 1);
434done:
5ab4a6c8
DS		 435 if (pmclocked)
436 write_unlock_bh(&pmc->sflock);
c9e3e8b6 437 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 438 read_unlock_bh(&idev->lock);
439 in6_dev_put(idev);
440 dev_put(dev);
c9e3e8b6
DS		 441 if (leavegroup)
442 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 443 return err;
444}
445
446int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
447{
448 struct in6_addr *group;
449 struct ipv6_mc_socklist *pmc;
450 struct net_device *dev;
451 struct inet6_dev *idev;
452 struct ipv6_pinfo *inet6 = inet6_sk(sk);
453 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 454 struct net *net = sock_net(sk);
9951f036 455 int leavegroup = 0;
1da177e4
LT		 456 int i, err;
457
458 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
459
460 if (!ipv6_addr_is_multicast(group))
461 return -EINVAL;
462 if (gsf->gf_fmode != MCAST_INCLUDE &&
463 gsf->gf_fmode != MCAST_EXCLUDE)
464 return -EINVAL;
465
b8ad0cbc 466 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 467
468 if (!idev)
469 return -ENODEV;
470 dev = idev->dev;
1da177e4 471
9c05989b 472 err = 0;
5ab4a6c8
DS		 473 read_lock_bh(&ipv6_sk_mc_lock);
474
9951f036
DS		 475 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
476 leavegroup = 1;
477 goto done;
478 }
479
1da177e4
LT		 480 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
481 if (pmc->ifindex != gsf->gf_interface)
482 continue;
483 if (ipv6_addr_equal(&pmc->addr, group))
484 break;
485 }
917f2f10
DS		 486 if (!pmc) { /* must have a prior join */
487 err = -EINVAL;
1da177e4 488 goto done;
917f2f10 489 }
1da177e4 490 if (gsf->gf_numsrc) {
8b3a7005
KK		 491 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
492 GFP_ATOMIC);
1da177e4
LT		 493 if (!newpsl) {
494 err = -ENOBUFS;
495 goto done;
496 }
497 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
498 for (i=0; i<newpsl->sl_count; ++i) {
499 struct sockaddr_in6 *psin6;
500
501 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
502 newpsl->sl_addr[i] = psin6->sin6_addr;
503 }
504 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
505 newpsl->sl_count, newpsl->sl_addr, 0);
506 if (err) {
507 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
508 goto done;
509 }
8713dbf0 510 } else {
1da177e4 511 newpsl = NULL;
8713dbf0
YZ		 512 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
513 }
5ab4a6c8
DS		 514
515 write_lock_bh(&pmc->sflock);
1da177e4
LT		 516 psl = pmc->sflist;
517 if (psl) {
518 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
519 psl->sl_count, psl->sl_addr, 0);
520 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
521 } else
522 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
523 pmc->sflist = newpsl;
524 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 525 write_unlock_bh(&pmc->sflock);
917f2f10 526 err = 0;
1da177e4 527done:
5ab4a6c8 528 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 529 read_unlock_bh(&idev->lock);
530 in6_dev_put(idev);
531 dev_put(dev);
9951f036
DS		 532 if (leavegroup)
533 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 534 return err;
535}
536
537int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
538 struct group_filter __user *optval, int __user *optlen)
539{
540 int err, i, count, copycount;
541 struct in6_addr *group;
542 struct ipv6_mc_socklist *pmc;
543 struct inet6_dev *idev;
544 struct net_device *dev;
545 struct ipv6_pinfo *inet6 = inet6_sk(sk);
546 struct ip6_sf_socklist *psl;
3b1e0a65 547 struct net *net = sock_net(sk);
1da177e4
LT		 548
549 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
550
551 if (!ipv6_addr_is_multicast(group))
552 return -EINVAL;
553
b8ad0cbc 554 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 555
556 if (!idev)
557 return -ENODEV;
558
559 dev = idev->dev;
560
561 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 562 /*
563 * changes to the ipv6_mc_list require the socket lock and
564 * a read lock on ip6_sk_mc_lock. We have the socket lock,
565 * so reading the list is safe.
566 */
1da177e4
LT		 567
568 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
569 if (pmc->ifindex != gsf->gf_interface)
570 continue;
571 if (ipv6_addr_equal(group, &pmc->addr))
572 break;
573 }
574 if (!pmc) /* must have a prior join */
575 goto done;
576 gsf->gf_fmode = pmc->sfmode;
577 psl = pmc->sflist;
578 count = psl ? psl->sl_count : 0;
579 read_unlock_bh(&idev->lock);
580 in6_dev_put(idev);
581 dev_put(dev);
582
583 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
584 gsf->gf_numsrc = count;
585 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
586 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
587 return -EFAULT;
588 }
5ab4a6c8
DS		 589 /* changes to psl require the socket lock, a read lock on
590 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
591 * have the socket lock, so reading here is safe.
592 */
1da177e4
LT		 593 for (i=0; i<copycount; i++) {
594 struct sockaddr_in6 *psin6;
595 struct sockaddr_storage ss;
596
597 psin6 = (struct sockaddr_in6 *)&ss;
598 memset(&ss, 0, sizeof(ss));
599 psin6->sin6_family = AF_INET6;
600 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 601 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 602 return -EFAULT;
603 }
604 return 0;
605done:
606 read_unlock_bh(&idev->lock);
607 in6_dev_put(idev);
608 dev_put(dev);
609 return err;
610}
611
9acd9f3a
YH		 612int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
613 const struct in6_addr *src_addr)
1da177e4
LT		 614{
615 struct ipv6_pinfo *np = inet6_sk(sk);
616 struct ipv6_mc_socklist *mc;
617 struct ip6_sf_socklist *psl;
618 int rv = 1;
619
620 read_lock(&ipv6_sk_mc_lock);
621 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
622 if (ipv6_addr_equal(&mc->addr, mc_addr))
623 break;
624 }
625 if (!mc) {
626 read_unlock(&ipv6_sk_mc_lock);
627 return 1;
628 }
5ab4a6c8 629 read_lock(&mc->sflock);
1da177e4
LT		 630 psl = mc->sflist;
631 if (!psl) {
632 rv = mc->sfmode == MCAST_EXCLUDE;
633 } else {
634 int i;
635
636 for (i=0; i<psl->sl_count; i++) {
637 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
638 break;
639 }
640 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
641 rv = 0;
642 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
643 rv = 0;
644 }
5ab4a6c8 645 read_unlock(&mc->sflock);
1da177e4
LT		 646 read_unlock(&ipv6_sk_mc_lock);
647
648 return rv;
649}
650
651static void ma_put(struct ifmcaddr6 *mc)
652{
653 if (atomic_dec_and_test(&mc->mca_refcnt)) {
654 in6_dev_put(mc->idev);
655 kfree(mc);
656 }
657}
658
659static void igmp6_group_added(struct ifmcaddr6 *mc)
660{
661 struct net_device *dev = mc->idev->dev;
662 char buf[MAX_ADDR_LEN];
663
664 spin_lock_bh(&mc->mca_lock);
665 if (!(mc->mca_flags&MAF_LOADED)) {
666 mc->mca_flags |= MAF_LOADED;
667 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 668 dev_mc_add(dev, buf);
1da177e4
LT		 669 }
670 spin_unlock_bh(&mc->mca_lock);
671
672 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
673 return;
674
675 if (MLD_V1_SEEN(mc->idev)) {
676 igmp6_join_group(mc);
677 return;
678 }
679 /* else v2 */
680
681 mc->mca_crcount = mc->idev->mc_qrv;
682 mld_ifc_event(mc->idev);
683}
684
685static void igmp6_group_dropped(struct ifmcaddr6 *mc)
686{
687 struct net_device *dev = mc->idev->dev;
688 char buf[MAX_ADDR_LEN];
689
690 spin_lock_bh(&mc->mca_lock);
691 if (mc->mca_flags&MAF_LOADED) {
692 mc->mca_flags &= ~MAF_LOADED;
693 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 694 dev_mc_del(dev, buf);
1da177e4
LT		 695 }
696
697 if (mc->mca_flags & MAF_NOREPORT)
698 goto done;
699 spin_unlock_bh(&mc->mca_lock);
700
701 if (!mc->idev->dead)
702 igmp6_leave_group(mc);
703
704 spin_lock_bh(&mc->mca_lock);
705 if (del_timer(&mc->mca_timer))
706 atomic_dec(&mc->mca_refcnt);
707done:
708 ip6_mc_clear_src(mc);
709 spin_unlock_bh(&mc->mca_lock);
710}
711
712/*
713 * deleted ifmcaddr6 manipulation
714 */
715static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
716{
717 struct ifmcaddr6 *pmc;
718
719 /* this is an "ifmcaddr6" for convenience; only the fields below
720 * are actually used. In particular, the refcnt and users are not
721 * used for management of the delete list. Using the same structure
722 * for deleted items allows change reports to use common code with
723 * non-deleted or query-response MCA's.
724 */
0c600eda 725 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 726 if (!pmc)
727 return;
0c600eda 728
1da177e4
LT		 729 spin_lock_bh(&im->mca_lock);
730 spin_lock_init(&pmc->mca_lock);
731 pmc->idev = im->idev;
732 in6_dev_hold(idev);
733 pmc->mca_addr = im->mca_addr;
734 pmc->mca_crcount = idev->mc_qrv;
735 pmc->mca_sfmode = im->mca_sfmode;
736 if (pmc->mca_sfmode == MCAST_INCLUDE) {
737 struct ip6_sf_list *psf;
738
739 pmc->mca_tomb = im->mca_tomb;
740 pmc->mca_sources = im->mca_sources;
741 im->mca_tomb = im->mca_sources = NULL;
742 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
743 psf->sf_crcount = pmc->mca_crcount;
744 }
745 spin_unlock_bh(&im->mca_lock);
746
6457d26b 747 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 748 pmc->next = idev->mc_tomb;
749 idev->mc_tomb = pmc;
6457d26b 750 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 751}
752
753static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
754{
755 struct ifmcaddr6 *pmc, *pmc_prev;
756 struct ip6_sf_list *psf, *psf_next;
757
6457d26b 758 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 759 pmc_prev = NULL;
760 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
761 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
762 break;
763 pmc_prev = pmc;
764 }
765 if (pmc) {
766 if (pmc_prev)
767 pmc_prev->next = pmc->next;
768 else
769 idev->mc_tomb = pmc->next;
770 }
6457d26b
SH		 771 spin_unlock_bh(&idev->mc_lock);
772
1da177e4
LT		 773 if (pmc) {
774 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
775 psf_next = psf->sf_next;
776 kfree(psf);
777 }
778 in6_dev_put(pmc->idev);
779 kfree(pmc);
780 }
781}
782
783static void mld_clear_delrec(struct inet6_dev *idev)
784{
785 struct ifmcaddr6 *pmc, *nextpmc;
786
6457d26b 787 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 788 pmc = idev->mc_tomb;
789 idev->mc_tomb = NULL;
6457d26b 790 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 791
792 for (; pmc; pmc = nextpmc) {
793 nextpmc = pmc->next;
794 ip6_mc_clear_src(pmc);
795 in6_dev_put(pmc->idev);
796 kfree(pmc);
797 }
798
799 /* clear dead sources, too */
800 read_lock_bh(&idev->lock);
801 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
802 struct ip6_sf_list *psf, *psf_next;
803
804 spin_lock_bh(&pmc->mca_lock);
805 psf = pmc->mca_tomb;
806 pmc->mca_tomb = NULL;
807 spin_unlock_bh(&pmc->mca_lock);
808 for (; psf; psf=psf_next) {
809 psf_next = psf->sf_next;
810 kfree(psf);
811 }
812 }
813 read_unlock_bh(&idev->lock);
814}
815
816
817/*
818 * device multicast group inc (add if not found)
819 */
9acd9f3a 820int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 821{
822 struct ifmcaddr6 *mc;
823 struct inet6_dev *idev;
824
825 idev = in6_dev_get(dev);
826
827 if (idev == NULL)
828 return -EINVAL;
829
830 write_lock_bh(&idev->lock);
831 if (idev->dead) {
832 write_unlock_bh(&idev->lock);
833 in6_dev_put(idev);
834 return -ENODEV;
835 }
836
837 for (mc = idev->mc_list; mc; mc = mc->next) {
838 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
839 mc->mca_users++;
840 write_unlock_bh(&idev->lock);
841 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
842 NULL, 0);
843 in6_dev_put(idev);
844 return 0;
845 }
846 }
847
848 /*
849 * not found: create a new one.
850 */
851
0c600eda 852 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 853
854 if (mc == NULL) {
855 write_unlock_bh(&idev->lock);
856 in6_dev_put(idev);
857 return -ENOMEM;
858 }
859
b24b8a24 860 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4
LT		 861
862 ipv6_addr_copy(&mc->mca_addr, addr);
863 mc->idev = idev;
864 mc->mca_users = 1;
865 /* mca_stamp should be updated upon changes */
866 mc->mca_cstamp = mc->mca_tstamp = jiffies;
867 atomic_set(&mc->mca_refcnt, 2);
868 spin_lock_init(&mc->mca_lock);
869
870 /* initial mode is (EX, empty) */
871 mc->mca_sfmode = MCAST_EXCLUDE;
872 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
873
874 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
875 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
876 mc->mca_flags |= MAF_NOREPORT;
877
878 mc->next = idev->mc_list;
879 idev->mc_list = mc;
880 write_unlock_bh(&idev->lock);
881
882 mld_del_delrec(idev, &mc->mca_addr);
883 igmp6_group_added(mc);
884 ma_put(mc);
885 return 0;
886}
887
888/*
889 * device multicast group del
890 */
9acd9f3a 891int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 892{
893 struct ifmcaddr6 *ma, **map;
894
895 write_lock_bh(&idev->lock);
896 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
897 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
898 if (--ma->mca_users == 0) {
899 *map = ma->next;
900 write_unlock_bh(&idev->lock);
901
902 igmp6_group_dropped(ma);
903
904 ma_put(ma);
905 return 0;
906 }
907 write_unlock_bh(&idev->lock);
908 return 0;
909 }
910 }
911 write_unlock_bh(&idev->lock);
912
913 return -ENOENT;
914}
915
9acd9f3a 916int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 917{
918 struct inet6_dev *idev = in6_dev_get(dev);
919 int err;
920
921 if (!idev)
922 return -ENODEV;
923
924 err = __ipv6_dev_mc_dec(idev, addr);
925
926 in6_dev_put(idev);
927
928 return err;
929}
930
931/*
932 * identify MLD packets for MLD filter exceptions
933 */
934int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
935{
936 struct icmp6hdr *pic;
937
938 if (nexthdr != IPPROTO_ICMPV6)
939 return 0;
940
941 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
942 return 0;
943
cc70ab26 944 pic = icmp6_hdr(skb);
1da177e4
LT		 945
946 switch (pic->icmp6_type) {
947 case ICMPV6_MGM_QUERY:
948 case ICMPV6_MGM_REPORT:
949 case ICMPV6_MGM_REDUCTION:
950 case ICMPV6_MLD2_REPORT:
951 return 1;
952 default:
953 break;
954 }
955 return 0;
956}
957
958/*
959 * check if the interface/address pair is valid
960 */
9acd9f3a
YH		 961int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
962 const struct in6_addr *src_addr)
1da177e4
LT		 963{
964 struct inet6_dev *idev;
965 struct ifmcaddr6 *mc;
966 int rv = 0;
967
968 idev = in6_dev_get(dev);
969 if (idev) {
970 read_lock_bh(&idev->lock);
971 for (mc = idev->mc_list; mc; mc=mc->next) {
972 if (ipv6_addr_equal(&mc->mca_addr, group))
973 break;
974 }
975 if (mc) {
976 if (src_addr && !ipv6_addr_any(src_addr)) {
977 struct ip6_sf_list *psf;
978
979 spin_lock_bh(&mc->mca_lock);
980 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
981 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
982 break;
983 }
984 if (psf)
985 rv = psf->sf_count[MCAST_INCLUDE] ||
986 psf->sf_count[MCAST_EXCLUDE] !=
987 mc->mca_sfcount[MCAST_EXCLUDE];
988 else
989 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
990 spin_unlock_bh(&mc->mca_lock);
991 } else
992 rv = 1; /* don't filter unspecified source */
993 }
994 read_unlock_bh(&idev->lock);
995 in6_dev_put(idev);
996 }
997 return rv;
998}
999
1000static void mld_gq_start_timer(struct inet6_dev *idev)
1001{
1002 int tv = net_random() % idev->mc_maxdelay;
1003
1004 idev->mc_gq_running = 1;
1005 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1006 in6_dev_hold(idev);
1007}
1008
1009static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1010{
1011 int tv = net_random() % delay;
1012
1013 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1014 in6_dev_hold(idev);
1015}
1016
1017/*
1018 * IGMP handling (alias multicast ICMPv6 messages)
1019 */
1020
1021static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1022{
1023 unsigned long delay = resptime;
1024
1025 /* Do not start timer for these addresses */
1026 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1027 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1028 return;
1029
1030 if (del_timer(&ma->mca_timer)) {
1031 atomic_dec(&ma->mca_refcnt);
1032 delay = ma->mca_timer.expires - jiffies;
1033 }
1034
1035 if (delay >= resptime) {
1036 if (resptime)
1037 delay = net_random() % resptime;
1038 else
1039 delay = 1;
1040 }
1041 ma->mca_timer.expires = jiffies + delay;
1042 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1043 atomic_inc(&ma->mca_refcnt);
1044 ma->mca_flags |= MAF_TIMER_RUNNING;
1045}
1046
5ab4a6c8
DS		 1047/* mark EXCLUDE-mode sources */
1048static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1049 struct in6_addr *srcs)
1050{
1051 struct ip6_sf_list *psf;
1052 int i, scount;
1053
1054 scount = 0;
1055 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1056 if (scount == nsrcs)
1057 break;
5ab4a6c8
DS		 1058 for (i=0; i<nsrcs; i++) {
1059 /* skip inactive filters */
1060 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1061 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1062 psf->sf_count[MCAST_EXCLUDE])
1063 continue;
1064 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1065 scount++;
1066 break;
1067 }
1068 }
1069 }
1070 pmc->mca_flags &= ~MAF_GSQUERY;
1071 if (scount == nsrcs) /* all sources excluded */
1072 return 0;
1073 return 1;
1074}
1075
1076static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1077 struct in6_addr *srcs)
1078{
1079 struct ip6_sf_list *psf;
1080 int i, scount;
1081
1082 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1083 return mld_xmarksources(pmc, nsrcs, srcs);
1084
1085 /* mark INCLUDE-mode sources */
1086
1087 scount = 0;
1088 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1089 if (scount == nsrcs)
1090 break;
1091 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1092 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1093 psf->sf_gsresp = 1;
1094 scount++;
1095 break;
1096 }
5ab4a6c8
DS		 1097 }
1098 }
1099 if (!scount) {
1100 pmc->mca_flags &= ~MAF_GSQUERY;
1101 return 0;
1da177e4 1102 }
5ab4a6c8
DS		 1103 pmc->mca_flags |= MAF_GSQUERY;
1104 return 1;
1da177e4
LT		 1105}
1106
1107int igmp6_event_query(struct sk_buff *skb)
1108{
97300b5f 1109 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1110 struct ifmcaddr6 *ma;
1111 struct in6_addr *group;
1112 unsigned long max_delay;
1113 struct inet6_dev *idev;
6e7cb837 1114 struct mld_msg *mld;
1da177e4
LT		 1115 int group_type;
1116 int mark = 0;
1117 int len;
1118
1119 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1120 return -EINVAL;
1121
1122 /* compute payload length excluding extension headers */
0660e03f 1123 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1124 len -= skb_network_header_len(skb);
1da177e4
LT		 1125
1126 /* Drop queries with not link local source */
0660e03f 1127 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1128 return -EINVAL;
1129
1130 idev = in6_dev_get(skb->dev);
1131
1132 if (idev == NULL)
1133 return 0;
1134
6e7cb837
YH		 1135 mld = (struct mld_msg *)icmp6_hdr(skb);
1136 group = &mld->mld_mca;
1da177e4
LT		 1137 group_type = ipv6_addr_type(group);
1138
1139 if (group_type != IPV6_ADDR_ANY &&
1140 !(group_type&IPV6_ADDR_MULTICAST)) {
1141 in6_dev_put(idev);
1142 return -EINVAL;
1143 }
1144
1145 if (len == 24) {
1146 int switchback;
1147 /* MLDv1 router present */
1148
1149 /* Translate milliseconds to jiffies */
6e7cb837 1150 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1da177e4
LT		 1151
1152 switchback = (idev->mc_qrv + 1) * max_delay;
1153 idev->mc_v1_seen = jiffies + switchback;
1154
1155 /* cancel the interface change timer */
1156 idev->mc_ifc_count = 0;
1157 if (del_timer(&idev->mc_ifc_timer))
1158 __in6_dev_put(idev);
1159 /* clear deleted report items */
1160 mld_clear_delrec(idev);
1161 } else if (len >= 28) {
1ab1457c 1162 int srcs_offset = sizeof(struct mld2_query) -
97300b5f
YZ		 1163 sizeof(struct icmp6hdr);
1164 if (!pskb_may_pull(skb, srcs_offset)) {
1165 in6_dev_put(idev);
1166 return -EINVAL;
1167 }
9c70220b 1168 mlh2 = (struct mld2_query *)skb_transport_header(skb);
6e7cb837 1169 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1da177e4
LT		 1170 if (!max_delay)
1171 max_delay = 1;
1172 idev->mc_maxdelay = max_delay;
6e7cb837
YH		 1173 if (mlh2->mld2q_qrv)
1174 idev->mc_qrv = mlh2->mld2q_qrv;
1da177e4 1175 if (group_type == IPV6_ADDR_ANY) { /* general query */
6e7cb837 1176 if (mlh2->mld2q_nsrcs) {
1da177e4
LT		 1177 in6_dev_put(idev);
1178 return -EINVAL; /* no sources allowed */
1179 }
1180 mld_gq_start_timer(idev);
1181 in6_dev_put(idev);
1182 return 0;
1183 }
1184 /* mark sources to include, if group & source-specific */
6e7cb837 1185 if (mlh2->mld2q_nsrcs != 0) {
1ab1457c 1186 if (!pskb_may_pull(skb, srcs_offset +
6e7cb837 1187 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1188 in6_dev_put(idev);
1189 return -EINVAL;
1190 }
9c70220b 1191 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1192 mark = 1;
1193 }
1da177e4
LT		 1194 } else {
1195 in6_dev_put(idev);
1196 return -EINVAL;
1197 }
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);
1230 in6_dev_put(idev);
1231
1232 return 0;
1233}
1234
1235
1236int igmp6_event_report(struct sk_buff *skb)
1237{
1238 struct ifmcaddr6 *ma;
1da177e4 1239 struct inet6_dev *idev;
6e7cb837 1240 struct mld_msg *mld;
1da177e4
LT		 1241 int addr_type;
1242
1243 /* Our own report looped back. Ignore it. */
1244 if (skb->pkt_type == PACKET_LOOPBACK)
1245 return 0;
1246
24c69275
DS		 1247 /* send our report if the MC router may not have heard this report */
1248 if (skb->pkt_type != PACKET_MULTICAST &&
1249 skb->pkt_type != PACKET_BROADCAST)
1250 return 0;
1251
6e7cb837 1252 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1da177e4
LT		 1253 return -EINVAL;
1254
6e7cb837 1255 mld = (struct mld_msg *)icmp6_hdr(skb);
1da177e4
LT		 1256
1257 /* Drop reports with not link local source */
0660e03f 1258 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1259 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1260 !(addr_type&IPV6_ADDR_LINKLOCAL))
1261 return -EINVAL;
1262
1da177e4
LT		 1263 idev = in6_dev_get(skb->dev);
1264 if (idev == NULL)
1265 return -ENODEV;
1266
1267 /*
1268 * Cancel the timer for this group
1269 */
1270
1271 read_lock_bh(&idev->lock);
1272 for (ma = idev->mc_list; ma; ma=ma->next) {
6e7cb837 1273 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1da177e4
LT		 1274 spin_lock(&ma->mca_lock);
1275 if (del_timer(&ma->mca_timer))
1276 atomic_dec(&ma->mca_refcnt);
1277 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1278 spin_unlock(&ma->mca_lock);
1279 break;
1280 }
1281 }
1282 read_unlock_bh(&idev->lock);
1283 in6_dev_put(idev);
1284 return 0;
1285}
1286
1287static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1288 int gdeleted, int sdeleted)
1289{
1290 switch (type) {
1291 case MLD2_MODE_IS_INCLUDE:
1292 case MLD2_MODE_IS_EXCLUDE:
1293 if (gdeleted || sdeleted)
1294 return 0;
5ab4a6c8
DS		 1295 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1296 if (pmc->mca_sfmode == MCAST_INCLUDE)
1297 return 1;
1298 /* don't include if this source is excluded
1299 * in all filters
1300 */
1301 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1302 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1303 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1304 psf->sf_count[MCAST_EXCLUDE];
1305 }
1306 return 0;
1da177e4
LT		 1307 case MLD2_CHANGE_TO_INCLUDE:
1308 if (gdeleted || sdeleted)
1309 return 0;
1310 return psf->sf_count[MCAST_INCLUDE] != 0;
1311 case MLD2_CHANGE_TO_EXCLUDE:
1312 if (gdeleted || sdeleted)
1313 return 0;
1314 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1315 psf->sf_count[MCAST_INCLUDE])
1316 return 0;
1317 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1318 psf->sf_count[MCAST_EXCLUDE];
1319 case MLD2_ALLOW_NEW_SOURCES:
1320 if (gdeleted || !psf->sf_crcount)
1321 return 0;
1322 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1323 case MLD2_BLOCK_OLD_SOURCES:
1324 if (pmc->mca_sfmode == MCAST_INCLUDE)
1325 return gdeleted || (psf->sf_crcount && sdeleted);
1326 return psf->sf_crcount && !gdeleted && !sdeleted;
1327 }
1328 return 0;
1329}
1330
1331static int
1332mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1333{
1334 struct ip6_sf_list *psf;
1335 int scount = 0;
1336
1337 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1338 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1339 continue;
1340 scount++;
1341 }
1342 return scount;
1343}
1344
1345static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1346{
c346dca1 1347 struct net *net = dev_net(dev);
b8ad0cbc 1348 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1349 struct sk_buff *skb;
1350 struct mld2_report *pmr;
1351 struct in6_addr addr_buf;
d7aabf22 1352 const struct in6_addr *saddr;
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 */
72e09ad1
ED		 1359 size += LL_ALLOCATED_SPACE(dev);
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
1367 skb_reserve(skb, LL_RESERVED_SPACE(dev));
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
LT		 1398 int payload_len, mldlen;
1399 struct inet6_dev *idev = in6_dev_get(skb->dev);
c346dca1 1400 struct net *net = dev_net(skb->dev);
1da177e4 1401 int err;
41927178 1402 struct flowi fl;
adf30907 1403 struct dst_entry *dst;
1da177e4 1404
edf391ff
NH		 1405 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1406
27a884dc
ACM		 1407 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1408 mldlen = skb->tail - skb->transport_header;
1da177e4
LT		 1409 pip6->payload_len = htons(payload_len);
1410
6e7cb837
YH		 1411 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1412 IPPROTO_ICMPV6,
1413 csum_partial(skb_transport_header(skb),
1414 mldlen, 0));
41927178 1415
adf30907 1416 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
41927178 1417
adf30907 1418 if (!dst) {
41927178
YH		 1419 err = -ENOMEM;
1420 goto err_out;
1421 }
1422
b8ad0cbc 1423 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
41927178
YH		 1424 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1425 skb->dev->ifindex);
1426
adf30907
ED		 1427 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
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
LT		 1443
1444 if (likely(idev != NULL))
1445 in6_dev_put(idev);
41927178
YH		 1446 return;
1447
1448err_out:
1449 kfree_skb(skb);
1450 goto out;
1da177e4
LT		 1451}
1452
1453static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1454{
fab10fe3 1455 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1456}
1457
1458static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1459 int type, struct mld2_grec **ppgr)
1460{
1461 struct net_device *dev = pmc->idev->dev;
1462 struct mld2_report *pmr;
1463 struct mld2_grec *pgr;
1464
1465 if (!skb)
1466 skb = mld_newpack(dev, dev->mtu);
1467 if (!skb)
1468 return NULL;
1469 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1470 pgr->grec_type = type;
1471 pgr->grec_auxwords = 0;
1472 pgr->grec_nsrcs = 0;
1473 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1474 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837 1475 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1da177e4
LT		 1476 *ppgr = pgr;
1477 return skb;
1478}
1479
1480#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1481 skb_tailroom(skb)) : 0)
1482
1483static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1484 int type, int gdeleted, int sdeleted)
1485{
1486 struct net_device *dev = pmc->idev->dev;
1487 struct mld2_report *pmr;
1488 struct mld2_grec *pgr = NULL;
1489 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1490 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1491
1492 if (pmc->mca_flags & MAF_NOREPORT)
1493 return skb;
1494
1495 isquery = type == MLD2_MODE_IS_INCLUDE ||
1496 type == MLD2_MODE_IS_EXCLUDE;
1497 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1498 type == MLD2_CHANGE_TO_EXCLUDE;
1499
5ab4a6c8
DS		 1500 stotal = scount = 0;
1501
1da177e4
LT		 1502 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1503
5ab4a6c8
DS		 1504 if (!*psf_list)
1505 goto empty_source;
1506
9c70220b 1507 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1508
1509 /* EX and TO_EX get a fresh packet, if needed */
1510 if (truncate) {
6e7cb837 1511 if (pmr && pmr->mld2r_ngrec &&
1da177e4
LT		 1512 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1513 if (skb)
1514 mld_sendpack(skb);
1515 skb = mld_newpack(dev, dev->mtu);
1516 }
1517 }
1518 first = 1;
1da177e4
LT		 1519 psf_prev = NULL;
1520 for (psf=*psf_list; psf; psf=psf_next) {
1521 struct in6_addr *psrc;
1522
1523 psf_next = psf->sf_next;
1524
1525 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1526 psf_prev = psf;
1527 continue;
1528 }
1529
1530 /* clear marks on query responses */
1531 if (isquery)
1532 psf->sf_gsresp = 0;
1533
1534 if (AVAILABLE(skb) < sizeof(*psrc) +
1535 first*sizeof(struct mld2_grec)) {
1536 if (truncate && !first)
1537 break; /* truncate these */
1538 if (pgr)
1539 pgr->grec_nsrcs = htons(scount);
1540 if (skb)
1541 mld_sendpack(skb);
1542 skb = mld_newpack(dev, dev->mtu);
1543 first = 1;
1544 scount = 0;
1545 }
1546 if (first) {
1547 skb = add_grhead(skb, pmc, type, &pgr);
1548 first = 0;
1549 }
cc63f70b
AD		 1550 if (!skb)
1551 return NULL;
1da177e4
LT		 1552 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1553 *psrc = psf->sf_addr;
5ab4a6c8 1554 scount++; stotal++;
1da177e4
LT		 1555 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1556 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1557 psf->sf_crcount--;
1558 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1559 if (psf_prev)
1560 psf_prev->sf_next = psf->sf_next;
1561 else
1562 *psf_list = psf->sf_next;
1563 kfree(psf);
1564 continue;
1565 }
1566 }
1567 psf_prev = psf;
1568 }
5ab4a6c8
DS		 1569
1570empty_source:
1571 if (!stotal) {
1572 if (type == MLD2_ALLOW_NEW_SOURCES ||
1573 type == MLD2_BLOCK_OLD_SOURCES)
1574 return skb;
1575 if (pmc->mca_crcount || isquery) {
1576 /* make sure we have room for group header */
1577 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1578 mld_sendpack(skb);
1579 skb = NULL; /* add_grhead will get a new one */
1580 }
1581 skb = add_grhead(skb, pmc, type, &pgr);
1582 }
1583 }
1da177e4
LT		 1584 if (pgr)
1585 pgr->grec_nsrcs = htons(scount);
1586
1587 if (isquery)
1588 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1589 return skb;
1590}
1591
1592static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1593{
1594 struct sk_buff *skb = NULL;
1595 int type;
1596
1597 if (!pmc) {
1598 read_lock_bh(&idev->lock);
1599 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1600 if (pmc->mca_flags & MAF_NOREPORT)
1601 continue;
1602 spin_lock_bh(&pmc->mca_lock);
1603 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1604 type = MLD2_MODE_IS_EXCLUDE;
1605 else
1606 type = MLD2_MODE_IS_INCLUDE;
1607 skb = add_grec(skb, pmc, type, 0, 0);
1608 spin_unlock_bh(&pmc->mca_lock);
1609 }
1610 read_unlock_bh(&idev->lock);
1611 } else {
1612 spin_lock_bh(&pmc->mca_lock);
1613 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1614 type = MLD2_MODE_IS_EXCLUDE;
1615 else
1616 type = MLD2_MODE_IS_INCLUDE;
1617 skb = add_grec(skb, pmc, type, 0, 0);
1618 spin_unlock_bh(&pmc->mca_lock);
1619 }
1620 if (skb)
1621 mld_sendpack(skb);
1622}
1623
1624/*
1625 * remove zero-count source records from a source filter list
1626 */
1627static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1628{
1629 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1630
1631 psf_prev = NULL;
1632 for (psf=*ppsf; psf; psf = psf_next) {
1633 psf_next = psf->sf_next;
1634 if (psf->sf_crcount == 0) {
1635 if (psf_prev)
1636 psf_prev->sf_next = psf->sf_next;
1637 else
1638 *ppsf = psf->sf_next;
1639 kfree(psf);
1640 } else
1641 psf_prev = psf;
1642 }
1643}
1644
1645static void mld_send_cr(struct inet6_dev *idev)
1646{
1647 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1648 struct sk_buff *skb = NULL;
1649 int type, dtype;
1650
1651 read_lock_bh(&idev->lock);
6457d26b 1652 spin_lock(&idev->mc_lock);
1da177e4
LT		 1653
1654 /* deleted MCA's */
1655 pmc_prev = NULL;
1656 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1657 pmc_next = pmc->next;
1658 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1659 type = MLD2_BLOCK_OLD_SOURCES;
1660 dtype = MLD2_BLOCK_OLD_SOURCES;
1661 skb = add_grec(skb, pmc, type, 1, 0);
1662 skb = add_grec(skb, pmc, dtype, 1, 1);
1663 }
1664 if (pmc->mca_crcount) {
1da177e4
LT		 1665 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1666 type = MLD2_CHANGE_TO_INCLUDE;
1667 skb = add_grec(skb, pmc, type, 1, 0);
1668 }
5ab4a6c8 1669 pmc->mca_crcount--;
1da177e4
LT		 1670 if (pmc->mca_crcount == 0) {
1671 mld_clear_zeros(&pmc->mca_tomb);
1672 mld_clear_zeros(&pmc->mca_sources);
1673 }
1674 }
1675 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1676 !pmc->mca_sources) {
1677 if (pmc_prev)
1678 pmc_prev->next = pmc_next;
1679 else
1680 idev->mc_tomb = pmc_next;
1681 in6_dev_put(pmc->idev);
1682 kfree(pmc);
1683 } else
1684 pmc_prev = pmc;
1685 }
6457d26b 1686 spin_unlock(&idev->mc_lock);
1da177e4
LT		 1687
1688 /* change recs */
1689 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1690 spin_lock_bh(&pmc->mca_lock);
1691 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1692 type = MLD2_BLOCK_OLD_SOURCES;
1693 dtype = MLD2_ALLOW_NEW_SOURCES;
1694 } else {
1695 type = MLD2_ALLOW_NEW_SOURCES;
1696 dtype = MLD2_BLOCK_OLD_SOURCES;
1697 }
1698 skb = add_grec(skb, pmc, type, 0, 0);
1699 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1700
1701 /* filter mode changes */
1702 if (pmc->mca_crcount) {
1da177e4
LT		 1703 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1704 type = MLD2_CHANGE_TO_EXCLUDE;
1705 else
1706 type = MLD2_CHANGE_TO_INCLUDE;
1707 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1708 pmc->mca_crcount--;
1da177e4
LT		 1709 }
1710 spin_unlock_bh(&pmc->mca_lock);
1711 }
1712 read_unlock_bh(&idev->lock);
1713 if (!skb)
1714 return;
1715 (void) mld_sendpack(skb);
1716}
1717
1718static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1719{
c346dca1 1720 struct net *net = dev_net(dev);
b8ad0cbc 1721 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1722 struct inet6_dev *idev;
1ab1457c 1723 struct sk_buff *skb;
6e7cb837 1724 struct mld_msg *hdr;
d7aabf22 1725 const struct in6_addr *snd_addr, *saddr;
1da177e4 1726 struct in6_addr addr_buf;
1da177e4
LT		 1727 int err, len, payload_len, full_len;
1728 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1729 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1730 IPV6_TLV_PADN, 0 };
41927178 1731 struct flowi fl;
adf30907 1732 struct dst_entry *dst;
1da177e4 1733
f3ee4010
YH		 1734 if (type == ICMPV6_MGM_REDUCTION)
1735 snd_addr = &in6addr_linklocal_allrouters;
1736 else
1737 snd_addr = addr;
1da177e4
LT		 1738
1739 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1740 payload_len = len + sizeof(ra);
1741 full_len = sizeof(struct ipv6hdr) + payload_len;
1742
edf391ff
NH		 1743 rcu_read_lock();
1744 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1745 IPSTATS_MIB_OUT, full_len);
1746 rcu_read_unlock();
1747
f5184d26 1748 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1da177e4
LT		 1749
1750 if (skb == NULL) {
a11d206d 1751 rcu_read_lock();
3bd653c8 1752 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH		 1753 IPSTATS_MIB_OUTDISCARDS);
1754 rcu_read_unlock();
1da177e4
LT		 1755 return;
1756 }
1757
1758 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1759
95c385b4 1760 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1761 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1762 * use unspecified address as the source address
1da177e4
LT		 1763 * when a valid link-local address is not available.
1764 */
d7aabf22
YH		 1765 saddr = &in6addr_any;
1766 } else
1767 saddr = &addr_buf;
1da177e4 1768
d7aabf22 1769 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4
LT		 1770
1771 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1772
6e7cb837
YH		 1773 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1774 memset(hdr, 0, sizeof(struct mld_msg));
1775 hdr->mld_type = type;
1776 ipv6_addr_copy(&hdr->mld_mca, addr);
1da177e4 1777
6e7cb837
YH		 1778 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1779 IPPROTO_ICMPV6,
1780 csum_partial(hdr, len, 0));
1da177e4
LT		 1781
1782 idev = in6_dev_get(skb->dev);
1783
adf30907
ED		 1784 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1785 if (!dst) {
41927178
YH		 1786 err = -ENOMEM;
1787 goto err_out;
1788 }
1789
b8ad0cbc 1790 icmpv6_flow_init(sk, &fl, type,
41927178
YH		 1791 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1792 skb->dev->ifindex);
1793
adf30907 1794 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
41927178
YH		 1795 if (err)
1796 goto err_out;
1797
adf30907 1798 skb_dst_set(skb, dst);
b2e0b385 1799 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1800 dst_output);
1801out:
1da177e4 1802 if (!err) {
5c5d244b 1803 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 1804 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1805 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1da177e4 1806 } else
3bd653c8 1807 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1808
1809 if (likely(idev != NULL))
1810 in6_dev_put(idev);
1811 return;
41927178
YH		 1812
1813err_out:
1814 kfree_skb(skb);
1815 goto out;
1da177e4
LT		 1816}
1817
1818static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1819 struct in6_addr *psfsrc)
1820{
1821 struct ip6_sf_list *psf, *psf_prev;
1822 int rv = 0;
1823
1824 psf_prev = NULL;
1825 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1826 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1827 break;
1828 psf_prev = psf;
1829 }
1830 if (!psf || psf->sf_count[sfmode] == 0) {
1831 /* source filter not found, or count wrong => bug */
1832 return -ESRCH;
1833 }
1834 psf->sf_count[sfmode]--;
1835 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1836 struct inet6_dev *idev = pmc->idev;
1837
1838 /* no more filters for this source */
1839 if (psf_prev)
1840 psf_prev->sf_next = psf->sf_next;
1841 else
1842 pmc->mca_sources = psf->sf_next;
1843 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1844 !MLD_V1_SEEN(idev)) {
1845 psf->sf_crcount = idev->mc_qrv;
1846 psf->sf_next = pmc->mca_tomb;
1847 pmc->mca_tomb = psf;
1848 rv = 1;
1849 } else
1850 kfree(psf);
1851 }
1852 return rv;
1853}
1854
1855static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1856 int sfmode, int sfcount, struct in6_addr *psfsrc,
1857 int delta)
1858{
1859 struct ifmcaddr6 *pmc;
1860 int changerec = 0;
1861 int i, err;
1862
1863 if (!idev)
1864 return -ENODEV;
1865 read_lock_bh(&idev->lock);
1866 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1867 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1868 break;
1869 }
1870 if (!pmc) {
1871 /* MCA not found?? bug */
1872 read_unlock_bh(&idev->lock);
1873 return -ESRCH;
1874 }
1875 spin_lock_bh(&pmc->mca_lock);
1876 sf_markstate(pmc);
1877 if (!delta) {
1878 if (!pmc->mca_sfcount[sfmode]) {
1879 spin_unlock_bh(&pmc->mca_lock);
1880 read_unlock_bh(&idev->lock);
1881 return -EINVAL;
1882 }
1883 pmc->mca_sfcount[sfmode]--;
1884 }
1885 err = 0;
1886 for (i=0; i<sfcount; i++) {
1887 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1888
1889 changerec |= rv > 0;
1890 if (!err && rv < 0)
1891 err = rv;
1892 }
1893 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1894 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1895 pmc->mca_sfcount[MCAST_INCLUDE]) {
1896 struct ip6_sf_list *psf;
1897
1898 /* filter mode change */
1899 pmc->mca_sfmode = MCAST_INCLUDE;
1900 pmc->mca_crcount = idev->mc_qrv;
1901 idev->mc_ifc_count = pmc->mca_crcount;
1902 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1903 psf->sf_crcount = 0;
1904 mld_ifc_event(pmc->idev);
1905 } else if (sf_setstate(pmc) || changerec)
1906 mld_ifc_event(pmc->idev);
1907 spin_unlock_bh(&pmc->mca_lock);
1908 read_unlock_bh(&idev->lock);
1909 return err;
1910}
1911
1912/*
1913 * Add multicast single-source filter to the interface list
1914 */
1915static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1916 struct in6_addr *psfsrc, int delta)
1917{
1918 struct ip6_sf_list *psf, *psf_prev;
1919
1920 psf_prev = NULL;
1921 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1922 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1923 break;
1924 psf_prev = psf;
1925 }
1926 if (!psf) {
0c600eda 1927 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1928 if (!psf)
1929 return -ENOBUFS;
0c600eda 1930
1da177e4
LT		 1931 psf->sf_addr = *psfsrc;
1932 if (psf_prev) {
1933 psf_prev->sf_next = psf;
1934 } else
1935 pmc->mca_sources = psf;
1936 }
1937 psf->sf_count[sfmode]++;
1938 return 0;
1939}
1940
1941static void sf_markstate(struct ifmcaddr6 *pmc)
1942{
1943 struct ip6_sf_list *psf;
1944 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1945
1946 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1947 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1948 psf->sf_oldin = mca_xcount ==
1949 psf->sf_count[MCAST_EXCLUDE] &&
1950 !psf->sf_count[MCAST_INCLUDE];
1951 } else
1952 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1953}
1954
1955static int sf_setstate(struct ifmcaddr6 *pmc)
1956{
7add2a43 1957 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 1958 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1959 int qrv = pmc->idev->mc_qrv;
1960 int new_in, rv;
1961
1962 rv = 0;
1963 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1964 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1965 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1966 !psf->sf_count[MCAST_INCLUDE];
1967 } else
1968 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 1969 if (new_in) {
1970 if (!psf->sf_oldin) {
e80e28b6 1971 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 1972
1973 for (dpsf=pmc->mca_tomb; dpsf;
1974 dpsf=dpsf->sf_next) {
1975 if (ipv6_addr_equal(&dpsf->sf_addr,
1976 &psf->sf_addr))
1977 break;
1978 prev = dpsf;
1979 }
1980 if (dpsf) {
1981 if (prev)
1982 prev->sf_next = dpsf->sf_next;
1983 else
1984 pmc->mca_tomb = dpsf->sf_next;
1985 kfree(dpsf);
1986 }
1987 psf->sf_crcount = qrv;
1988 rv++;
1989 }
1990 } else if (psf->sf_oldin) {
1991 psf->sf_crcount = 0;
1992 /*
1993 * add or update "delete" records if an active filter
1994 * is now inactive
1995 */
1996 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1997 if (ipv6_addr_equal(&dpsf->sf_addr,
1998 &psf->sf_addr))
1999 break;
2000 if (!dpsf) {
5d55354f 2001 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
7add2a43
DS		 2002 if (!dpsf)
2003 continue;
2004 *dpsf = *psf;
2005 /* pmc->mca_lock held by callers */
2006 dpsf->sf_next = pmc->mca_tomb;
2007 pmc->mca_tomb = dpsf;
2008 }
2009 dpsf->sf_crcount = qrv;
1da177e4
LT		 2010 rv++;
2011 }
2012 }
2013 return rv;
2014}
2015
2016/*
2017 * Add multicast source filter list to the interface list
2018 */
2019static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2020 int sfmode, int sfcount, struct in6_addr *psfsrc,
2021 int delta)
2022{
2023 struct ifmcaddr6 *pmc;
2024 int isexclude;
2025 int i, err;
2026
2027 if (!idev)
2028 return -ENODEV;
2029 read_lock_bh(&idev->lock);
2030 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2031 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2032 break;
2033 }
2034 if (!pmc) {
2035 /* MCA not found?? bug */
2036 read_unlock_bh(&idev->lock);
2037 return -ESRCH;
2038 }
2039 spin_lock_bh(&pmc->mca_lock);
2040
2041 sf_markstate(pmc);
2042 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2043 if (!delta)
2044 pmc->mca_sfcount[sfmode]++;
2045 err = 0;
2046 for (i=0; i<sfcount; i++) {
2047 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2048 if (err)
2049 break;
2050 }
2051 if (err) {
2052 int j;
2053
2054 if (!delta)
2055 pmc->mca_sfcount[sfmode]--;
2056 for (j=0; j<i; j++)
2057 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2058 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT		 2059 struct ip6_sf_list *psf;
2060
2061 /* filter mode change */
2062 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2063 pmc->mca_sfmode = MCAST_EXCLUDE;
2064 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2065 pmc->mca_sfmode = MCAST_INCLUDE;
2066 /* else no filters; keep old mode for reports */
2067
2068 pmc->mca_crcount = idev->mc_qrv;
2069 idev->mc_ifc_count = pmc->mca_crcount;
2070 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2071 psf->sf_crcount = 0;
2072 mld_ifc_event(idev);
2073 } else if (sf_setstate(pmc))
2074 mld_ifc_event(idev);
2075 spin_unlock_bh(&pmc->mca_lock);
2076 read_unlock_bh(&idev->lock);
2077 return err;
2078}
2079
2080static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2081{
2082 struct ip6_sf_list *psf, *nextpsf;
2083
2084 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2085 nextpsf = psf->sf_next;
2086 kfree(psf);
2087 }
2088 pmc->mca_tomb = NULL;
2089 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2090 nextpsf = psf->sf_next;
2091 kfree(psf);
2092 }
2093 pmc->mca_sources = NULL;
2094 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2095 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2096 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2097}
2098
2099
2100static void igmp6_join_group(struct ifmcaddr6 *ma)
2101{
2102 unsigned long delay;
2103
2104 if (ma->mca_flags & MAF_NOREPORT)
2105 return;
2106
2107 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2108
2109 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2110
2111 spin_lock_bh(&ma->mca_lock);
2112 if (del_timer(&ma->mca_timer)) {
2113 atomic_dec(&ma->mca_refcnt);
2114 delay = ma->mca_timer.expires - jiffies;
2115 }
2116
2117 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2118 atomic_inc(&ma->mca_refcnt);
2119 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2120 spin_unlock_bh(&ma->mca_lock);
2121}
2122
2123static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2124 struct inet6_dev *idev)
2125{
2126 int err;
2127
5ab4a6c8
DS		 2128 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2129 * so no other readers or writers of iml or its sflist
2130 */
cfcabdcc 2131 if (!iml->sflist) {
1da177e4
LT		 2132 /* any-source empty exclude case */
2133 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2134 }
2135 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2136 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2137 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2138 iml->sflist = NULL;
2139 return err;
2140}
2141
2142static void igmp6_leave_group(struct ifmcaddr6 *ma)
2143{
2144 if (MLD_V1_SEEN(ma->idev)) {
2145 if (ma->mca_flags & MAF_LAST_REPORTER)
2146 igmp6_send(&ma->mca_addr, ma->idev->dev,
2147 ICMPV6_MGM_REDUCTION);
2148 } else {
2149 mld_add_delrec(ma->idev, ma);
2150 mld_ifc_event(ma->idev);
2151 }
2152}
2153
2154static void mld_gq_timer_expire(unsigned long data)
2155{
2156 struct inet6_dev *idev = (struct inet6_dev *)data;
2157
2158 idev->mc_gq_running = 0;
2159 mld_send_report(idev, NULL);
2160 __in6_dev_put(idev);
2161}
2162
2163static void mld_ifc_timer_expire(unsigned long data)
2164{
2165 struct inet6_dev *idev = (struct inet6_dev *)data;
2166
2167 mld_send_cr(idev);
2168 if (idev->mc_ifc_count) {
2169 idev->mc_ifc_count--;
2170 if (idev->mc_ifc_count)
2171 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2172 }
2173 __in6_dev_put(idev);
2174}
2175
2176static void mld_ifc_event(struct inet6_dev *idev)
2177{
2178 if (MLD_V1_SEEN(idev))
2179 return;
2180 idev->mc_ifc_count = idev->mc_qrv;
2181 mld_ifc_start_timer(idev, 1);
2182}
2183
2184
2185static void igmp6_timer_handler(unsigned long data)
2186{
2187 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2188
2189 if (MLD_V1_SEEN(ma->idev))
2190 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2191 else
2192 mld_send_report(ma->idev, ma);
2193
2194 spin_lock(&ma->mca_lock);
2195 ma->mca_flags |= MAF_LAST_REPORTER;
2196 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2197 spin_unlock(&ma->mca_lock);
2198 ma_put(ma);
2199}
2200
75c78500
MS		 2201/* Device changing type */
2202
2203void ipv6_mc_unmap(struct inet6_dev *idev)
2204{
2205 struct ifmcaddr6 *i;
2206
2207 /* Install multicast list, except for all-nodes (already installed) */
2208
2209 read_lock_bh(&idev->lock);
2210 for (i = idev->mc_list; i; i = i->next)
2211 igmp6_group_dropped(i);
2212 read_unlock_bh(&idev->lock);
2213}
2214
2215void ipv6_mc_remap(struct inet6_dev *idev)
2216{
2217 ipv6_mc_up(idev);
2218}
2219
1da177e4
LT		 2220/* Device going down */
2221
2222void ipv6_mc_down(struct inet6_dev *idev)
2223{
2224 struct ifmcaddr6 *i;
2225
2226 /* Withdraw multicast list */
2227
2228 read_lock_bh(&idev->lock);
2229 idev->mc_ifc_count = 0;
2230 if (del_timer(&idev->mc_ifc_timer))
2231 __in6_dev_put(idev);
2232 idev->mc_gq_running = 0;
2233 if (del_timer(&idev->mc_gq_timer))
2234 __in6_dev_put(idev);
2235
2236 for (i = idev->mc_list; i; i=i->next)
2237 igmp6_group_dropped(i);
2238 read_unlock_bh(&idev->lock);
2239
2240 mld_clear_delrec(idev);
2241}
2242
2243
2244/* Device going up */
2245
2246void ipv6_mc_up(struct inet6_dev *idev)
2247{
2248 struct ifmcaddr6 *i;
2249
2250 /* Install multicast list, except for all-nodes (already installed) */
2251
2252 read_lock_bh(&idev->lock);
2253 for (i = idev->mc_list; i; i=i->next)
2254 igmp6_group_added(i);
2255 read_unlock_bh(&idev->lock);
2256}
2257
2258/* IPv6 device initialization. */
2259
2260void ipv6_mc_init_dev(struct inet6_dev *idev)
2261{
1da177e4 2262 write_lock_bh(&idev->lock);
6457d26b 2263 spin_lock_init(&idev->mc_lock);
1da177e4 2264 idev->mc_gq_running = 0;
b24b8a24
PE		 2265 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2266 (unsigned long)idev);
1da177e4
LT		 2267 idev->mc_tomb = NULL;
2268 idev->mc_ifc_count = 0;
b24b8a24
PE		 2269 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2270 (unsigned long)idev);
1da177e4
LT		 2271 idev->mc_qrv = MLD_QRV_DEFAULT;
2272 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2273 idev->mc_v1_seen = 0;
2274 write_unlock_bh(&idev->lock);
1da177e4
LT		 2275}
2276
2277/*
2278 * Device is about to be destroyed: clean up.
2279 */
2280
2281void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2282{
2283 struct ifmcaddr6 *i;
1da177e4
LT		 2284
2285 /* Deactivate timers */
2286 ipv6_mc_down(idev);
2287
2288 /* Delete all-nodes address. */
1da177e4
LT		 2289 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2290 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2291 * fail.
2292 */
f3ee4010 2293 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2294
f3ee4010
YH		 2295 if (idev->cnf.forwarding)
2296 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT		 2297
2298 write_lock_bh(&idev->lock);
2299 while ((i = idev->mc_list) != NULL) {
2300 idev->mc_list = i->next;
2301 write_unlock_bh(&idev->lock);
2302
2303 igmp6_group_dropped(i);
2304 ma_put(i);
2305
2306 write_lock_bh(&idev->lock);
2307 }
2308 write_unlock_bh(&idev->lock);
2309}
2310
2311#ifdef CONFIG_PROC_FS
2312struct igmp6_mc_iter_state {
b8ad0cbc 2313 struct seq_net_private p;
1da177e4
LT		 2314 struct net_device *dev;
2315 struct inet6_dev *idev;
2316};
2317
2318#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2319
2320static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2321{
2322 struct ifmcaddr6 *im = NULL;
2323 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2324 struct net *net = seq_file_net(seq);
1da177e4 2325
7562f876 2326 state->idev = NULL;
ce81b76a 2327 for_each_netdev_rcu(net, state->dev) {
1da177e4 2328 struct inet6_dev *idev;
ce81b76a 2329 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2330 if (!idev)
2331 continue;
2332 read_lock_bh(&idev->lock);
2333 im = idev->mc_list;
2334 if (im) {
2335 state->idev = idev;
2336 break;
2337 }
2338 read_unlock_bh(&idev->lock);
1da177e4
LT		 2339 }
2340 return im;
2341}
2342
2343static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2344{
2345 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2346
2347 im = im->next;
2348 while (!im) {
ce81b76a 2349 if (likely(state->idev != NULL))
1da177e4 2350 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2351
2352 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2353 if (!state->dev) {
2354 state->idev = NULL;
2355 break;
2356 }
ce81b76a 2357 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2358 if (!state->idev)
2359 continue;
2360 read_lock_bh(&state->idev->lock);
2361 im = state->idev->mc_list;
2362 }
2363 return im;
2364}
2365
2366static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2367{
2368 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2369 if (im)
2370 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2371 --pos;
2372 return pos ? NULL : im;
2373}
2374
2375static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2376 __acquires(RCU)
1da177e4 2377{
ce81b76a 2378 rcu_read_lock();
1da177e4
LT		 2379 return igmp6_mc_get_idx(seq, *pos);
2380}
2381
2382static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2383{
ce81b76a
ED		 2384 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2385
1da177e4
LT		 2386 ++*pos;
2387 return im;
2388}
2389
2390static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2391 __releases(RCU)
1da177e4
LT		 2392{
2393 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2394
1da177e4
LT		 2395 if (likely(state->idev != NULL)) {
2396 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2397 state->idev = NULL;
2398 }
2399 state->dev = NULL;
ce81b76a 2400 rcu_read_unlock();
1da177e4
LT		 2401}
2402
2403static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2404{
2405 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2406 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2407
2408 seq_printf(seq,
4b7a4274 2409 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2410 state->dev->ifindex, state->dev->name,
b071195d 2411 &im->mca_addr,
1da177e4
LT		 2412 im->mca_users, im->mca_flags,
2413 (im->mca_flags&MAF_TIMER_RUNNING) ?
2414 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2415 return 0;
2416}
2417
56b3d975 2418static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2419 .start = igmp6_mc_seq_start,
2420 .next = igmp6_mc_seq_next,
2421 .stop = igmp6_mc_seq_stop,
2422 .show = igmp6_mc_seq_show,
2423};
2424
2425static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2426{
b8ad0cbc
DL		 2427 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2428 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2429}
2430
9a32144e 2431static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2432 .owner = THIS_MODULE,
2433 .open = igmp6_mc_seq_open,
2434 .read = seq_read,
2435 .llseek = seq_lseek,
b8ad0cbc 2436 .release = seq_release_net,
1da177e4
LT		 2437};
2438
2439struct igmp6_mcf_iter_state {
b8ad0cbc 2440 struct seq_net_private p;
1da177e4
LT		 2441 struct net_device *dev;
2442 struct inet6_dev *idev;
2443 struct ifmcaddr6 *im;
2444};
2445
2446#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2447
2448static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2449{
2450 struct ip6_sf_list *psf = NULL;
2451 struct ifmcaddr6 *im = NULL;
2452 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2453 struct net *net = seq_file_net(seq);
1da177e4 2454
7562f876
PE		 2455 state->idev = NULL;
2456 state->im = NULL;
ce81b76a 2457 for_each_netdev_rcu(net, state->dev) {
1da177e4 2458 struct inet6_dev *idev;
ce81b76a 2459 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2460 if (unlikely(idev == NULL))
2461 continue;
2462 read_lock_bh(&idev->lock);
2463 im = idev->mc_list;
2464 if (likely(im != NULL)) {
2465 spin_lock_bh(&im->mca_lock);
2466 psf = im->mca_sources;
2467 if (likely(psf != NULL)) {
2468 state->im = im;
2469 state->idev = idev;
2470 break;
2471 }
2472 spin_unlock_bh(&im->mca_lock);
2473 }
2474 read_unlock_bh(&idev->lock);
1da177e4
LT		 2475 }
2476 return psf;
2477}
2478
2479static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2480{
2481 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2482
2483 psf = psf->sf_next;
2484 while (!psf) {
2485 spin_unlock_bh(&state->im->mca_lock);
2486 state->im = state->im->next;
2487 while (!state->im) {
ce81b76a 2488 if (likely(state->idev != NULL))
1da177e4 2489 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2490
2491 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2492 if (!state->dev) {
2493 state->idev = NULL;
2494 goto out;
2495 }
ce81b76a 2496 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2497 if (!state->idev)
2498 continue;
2499 read_lock_bh(&state->idev->lock);
2500 state->im = state->idev->mc_list;
2501 }
2502 if (!state->im)
2503 break;
2504 spin_lock_bh(&state->im->mca_lock);
2505 psf = state->im->mca_sources;
2506 }
2507out:
2508 return psf;
2509}
2510
2511static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2512{
2513 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2514 if (psf)
2515 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2516 --pos;
2517 return pos ? NULL : psf;
2518}
2519
2520static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2521 __acquires(RCU)
1da177e4 2522{
ce81b76a 2523 rcu_read_lock();
1da177e4
LT		 2524 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2525}
2526
2527static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2528{
2529 struct ip6_sf_list *psf;
2530 if (v == SEQ_START_TOKEN)
2531 psf = igmp6_mcf_get_first(seq);
2532 else
2533 psf = igmp6_mcf_get_next(seq, v);
2534 ++*pos;
2535 return psf;
2536}
2537
2538static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2539 __releases(RCU)
1da177e4
LT		 2540{
2541 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2542 if (likely(state->im != NULL)) {
2543 spin_unlock_bh(&state->im->mca_lock);
2544 state->im = NULL;
2545 }
2546 if (likely(state->idev != NULL)) {
2547 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2548 state->idev = NULL;
2549 }
2550 state->dev = NULL;
ce81b76a 2551 rcu_read_unlock();
1da177e4
LT		 2552}
2553
2554static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2555{
2556 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2557 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2558
2559 if (v == SEQ_START_TOKEN) {
1ab1457c 2560 seq_printf(seq,
1da177e4 2561 "%3s %6s "
9343e79a 2562 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2563 "Device", "Multicast Address",
2564 "Source Address", "INC", "EXC");
2565 } else {
2566 seq_printf(seq,
4b7a4274 2567 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 2568 state->dev->ifindex, state->dev->name,
b071195d
HH		 2569 &state->im->mca_addr,
2570 &psf->sf_addr,
1da177e4
LT		 2571 psf->sf_count[MCAST_INCLUDE],
2572 psf->sf_count[MCAST_EXCLUDE]);
2573 }
2574 return 0;
2575}
2576
56b3d975 2577static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2578 .start = igmp6_mcf_seq_start,
2579 .next = igmp6_mcf_seq_next,
2580 .stop = igmp6_mcf_seq_stop,
2581 .show = igmp6_mcf_seq_show,
2582};
2583
2584static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2585{
b8ad0cbc
DL		 2586 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2587 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2588}
2589
9a32144e 2590static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2591 .owner = THIS_MODULE,
2592 .open = igmp6_mcf_seq_open,
2593 .read = seq_read,
2594 .llseek = seq_lseek,
b8ad0cbc 2595 .release = seq_release_net,
1da177e4 2596};
ea82edf7 2597
2c8c1e72 2598static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL		 2599{
2600 int err;
2601
2602 err = -ENOMEM;
2603 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2604 goto out;
2605 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2606 &igmp6_mcf_seq_fops))
2607 goto out_proc_net_igmp6;
2608
2609 err = 0;
2610out:
2611 return err;
2612
2613out_proc_net_igmp6:
2614 proc_net_remove(net, "igmp6");
2615 goto out;
2616}
2617
2c8c1e72 2618static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7
DL		 2619{
2620 proc_net_remove(net, "mcfilter6");
2621 proc_net_remove(net, "igmp6");
2622}
2623#else
2c8c1e72 2624static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL		 2625{
2626 return 0;
2627}
2c8c1e72 2628static inline void igmp6_proc_exit(struct net *net)
ea82edf7 2629{
ea82edf7 2630}
1da177e4
LT		 2631#endif
2632
2c8c1e72 2633static int __net_init igmp6_net_init(struct net *net)
1da177e4 2634{
1da177e4
LT		 2635 int err;
2636
1ed8516f
DL		 2637 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2638 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 2639 if (err < 0) {
2640 printk(KERN_ERR
2641 "Failed to initialize the IGMP6 control socket (err %d).\n",
2642 err);
b8ad0cbc 2643 goto out;
1da177e4
LT		 2644 }
2645
1ed8516f 2646 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2647
ea82edf7
DL		 2648 err = igmp6_proc_init(net);
2649 if (err)
b8ad0cbc 2650 goto out_sock_create;
b8ad0cbc
DL		 2651out:
2652 return err;
2653
2654out_sock_create:
1ed8516f 2655 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2656 goto out;
1da177e4
LT		 2657}
2658
2c8c1e72 2659static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 2660{
1ed8516f 2661 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2662 igmp6_proc_exit(net);
1da177e4 2663}
b8ad0cbc
DL		 2664
2665static struct pernet_operations igmp6_net_ops = {
2666 .init = igmp6_net_init,
2667 .exit = igmp6_net_exit,
2668};
2669
2670int __init igmp6_init(void)
2671{
2672 return register_pernet_subsys(&igmp6_net_ops);
2673}
2674
2675void igmp6_cleanup(void)
2676{
2677 unregister_pernet_subsys(&igmp6_net_ops);
2678}
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