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[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>
46
47#include <linux/netfilter.h>
48#include <linux/netfilter_ipv6.h>
49
457c4cbc 50#include <net/net_namespace.h>
1da177e4
LT		 51#include <net/sock.h>
52#include <net/snmp.h>
53
54#include <net/ipv6.h>
55#include <net/protocol.h>
56#include <net/if_inet6.h>
57#include <net/ndisc.h>
58#include <net/addrconf.h>
59#include <net/ip6_route.h>
1ed8516f 60#include <net/inet_common.h>
1da177e4
LT		 61
62#include <net/ip6_checksum.h>
63
64/* Set to 3 to get tracing... */
65#define MCAST_DEBUG 2
66
67#if MCAST_DEBUG >= 3
68#define MDBG(x) printk x
69#else
70#define MDBG(x)
71#endif
72
73/*
74 * These header formats should be in a separate include file, but icmpv6.h
75 * doesn't have in6_addr defined in all cases, there is no __u128, and no
76 * other files reference these.
77 *
78 * +-DLS 4/14/03
79 */
80
81/* Multicast Listener Discovery version 2 headers */
82
83struct mld2_grec {
84 __u8 grec_type;
85 __u8 grec_auxwords;
8a74ff77 86 __be16 grec_nsrcs;
1da177e4
LT		 87 struct in6_addr grec_mca;
88 struct in6_addr grec_src[0];
89};
90
91struct mld2_report {
92 __u8 type;
93 __u8 resv1;
868c86bc 94 __sum16 csum;
8a74ff77
AV		 95 __be16 resv2;
96 __be16 ngrec;
1da177e4
LT		 97 struct mld2_grec grec[0];
98};
99
100struct mld2_query {
101 __u8 type;
102 __u8 code;
868c86bc 103 __sum16 csum;
8a74ff77
AV		 104 __be16 mrc;
105 __be16 resv1;
1da177e4
LT		 106 struct in6_addr mca;
107#if defined(__LITTLE_ENDIAN_BITFIELD)
108 __u8 qrv:3,
109 suppress:1,
110 resv2:4;
111#elif defined(__BIG_ENDIAN_BITFIELD)
112 __u8 resv2:4,
113 suppress:1,
114 qrv:3;
115#else
116#error "Please fix <asm/byteorder.h>"
117#endif
118 __u8 qqic;
8a74ff77 119 __be16 nsrcs;
1da177e4
LT		 120 struct in6_addr srcs[0];
121};
122
123static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
124
125/* Big mc list lock for all the sockets */
126static DEFINE_RWLOCK(ipv6_sk_mc_lock);
127
1da177e4
LT		 128static void igmp6_join_group(struct ifmcaddr6 *ma);
129static void igmp6_leave_group(struct ifmcaddr6 *ma);
130static void igmp6_timer_handler(unsigned long data);
131
132static void mld_gq_timer_expire(unsigned long data);
133static void mld_ifc_timer_expire(unsigned long data);
134static void mld_ifc_event(struct inet6_dev *idev);
135static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
136static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
137static void mld_clear_delrec(struct inet6_dev *idev);
138static int sf_setstate(struct ifmcaddr6 *pmc);
139static void sf_markstate(struct ifmcaddr6 *pmc);
140static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
141static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
142 int sfmode, int sfcount, struct in6_addr *psfsrc,
143 int delta);
144static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
145 int sfmode, int sfcount, struct in6_addr *psfsrc,
146 int delta);
147static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
148 struct inet6_dev *idev);
149
150
151#define IGMP6_UNSOLICITED_IVAL (10*HZ)
152#define MLD_QRV_DEFAULT 2
153
154#define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
155 (idev)->cnf.force_mld_version == 1 || \
156 ((idev)->mc_v1_seen && \
157 time_before(jiffies, (idev)->mc_v1_seen)))
158
159#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
160#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
161 ((value) < (thresh) ? (value) : \
f12baeab 162 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
1da177e4
LT		 163 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
164
1da177e4
LT		 165#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
166
6f4353d8 167#define IPV6_MLD_MAX_MSF 64
1da177e4 168
ab32ea5d 169int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 170
171/*
172 * socket join on multicast group
173 */
174
9acd9f3a 175int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 176{
177 struct net_device *dev = NULL;
178 struct ipv6_mc_socklist *mc_lst;
179 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 180 struct net *net = sock_net(sk);
1da177e4
LT		 181 int err;
182
183 if (!ipv6_addr_is_multicast(addr))
184 return -EINVAL;
185
c9e3e8b6
DS		 186 read_lock_bh(&ipv6_sk_mc_lock);
187 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
188 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
189 ipv6_addr_equal(&mc_lst->addr, addr)) {
190 read_unlock_bh(&ipv6_sk_mc_lock);
191 return -EADDRINUSE;
192 }
193 }
194 read_unlock_bh(&ipv6_sk_mc_lock);
195
1da177e4
LT		 196 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
197
198 if (mc_lst == NULL)
199 return -ENOMEM;
200
201 mc_lst->next = NULL;
202 ipv6_addr_copy(&mc_lst->addr, addr);
203
204 if (ifindex == 0) {
205 struct rt6_info *rt;
b8ad0cbc 206 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4
LT		 207 if (rt) {
208 dev = rt->rt6i_dev;
209 dev_hold(dev);
210 dst_release(&rt->u.dst);
211 }
212 } else
b8ad0cbc 213 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 214
215 if (dev == NULL) {
216 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
217 return -ENODEV;
218 }
219
220 mc_lst->ifindex = dev->ifindex;
221 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 222 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 223 mc_lst->sflist = NULL;
224
225 /*
226 * now add/increase the group membership on the device
227 */
228
229 err = ipv6_dev_mc_inc(dev, addr);
230
231 if (err) {
232 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
233 dev_put(dev);
234 return err;
235 }
236
237 write_lock_bh(&ipv6_sk_mc_lock);
238 mc_lst->next = np->ipv6_mc_list;
239 np->ipv6_mc_list = mc_lst;
240 write_unlock_bh(&ipv6_sk_mc_lock);
241
242 dev_put(dev);
243
244 return 0;
245}
246
247/*
248 * socket leave on multicast group
249 */
9acd9f3a 250int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 251{
252 struct ipv6_pinfo *np = inet6_sk(sk);
253 struct ipv6_mc_socklist *mc_lst, **lnk;
3b1e0a65 254 struct net *net = sock_net(sk);
1da177e4
LT		 255
256 write_lock_bh(&ipv6_sk_mc_lock);
257 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
258 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
259 ipv6_addr_equal(&mc_lst->addr, addr)) {
260 struct net_device *dev;
261
262 *lnk = mc_lst->next;
263 write_unlock_bh(&ipv6_sk_mc_lock);
264
b8ad0cbc
DL		 265 dev = dev_get_by_index(net, mc_lst->ifindex);
266 if (dev != NULL) {
1da177e4
LT		 267 struct inet6_dev *idev = in6_dev_get(dev);
268
acd6e00b 269 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 270 if (idev) {
1da177e4
LT		 271 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
272 in6_dev_put(idev);
273 }
274 dev_put(dev);
acd6e00b
DS		 275 } else
276 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 277 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
278 return 0;
279 }
280 }
281 write_unlock_bh(&ipv6_sk_mc_lock);
282
9951f036 283 return -EADDRNOTAVAIL;
1da177e4
LT		 284}
285
b8ad0cbc
DL		 286static struct inet6_dev *ip6_mc_find_dev(struct net *net,
287 struct in6_addr *group,
288 int ifindex)
1da177e4
LT		 289{
290 struct net_device *dev = NULL;
291 struct inet6_dev *idev = NULL;
292
293 if (ifindex == 0) {
294 struct rt6_info *rt;
295
b8ad0cbc 296 rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4
LT		 297 if (rt) {
298 dev = rt->rt6i_dev;
299 dev_hold(dev);
300 dst_release(&rt->u.dst);
301 }
302 } else
b8ad0cbc 303 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 304
305 if (!dev)
306 return NULL;
307 idev = in6_dev_get(dev);
308 if (!idev) {
309 dev_put(dev);
310 return NULL;
311 }
312 read_lock_bh(&idev->lock);
313 if (idev->dead) {
314 read_unlock_bh(&idev->lock);
315 in6_dev_put(idev);
316 dev_put(dev);
317 return NULL;
318 }
319 return idev;
320}
321
322void ipv6_sock_mc_close(struct sock *sk)
323{
324 struct ipv6_pinfo *np = inet6_sk(sk);
325 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 326 struct net *net = sock_net(sk);
1da177e4
LT		 327
328 write_lock_bh(&ipv6_sk_mc_lock);
329 while ((mc_lst = np->ipv6_mc_list) != NULL) {
330 struct net_device *dev;
331
332 np->ipv6_mc_list = mc_lst->next;
333 write_unlock_bh(&ipv6_sk_mc_lock);
334
b8ad0cbc 335 dev = dev_get_by_index(net, mc_lst->ifindex);
1da177e4
LT		 336 if (dev) {
337 struct inet6_dev *idev = in6_dev_get(dev);
338
acd6e00b 339 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 340 if (idev) {
1da177e4
LT		 341 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
342 in6_dev_put(idev);
343 }
344 dev_put(dev);
acd6e00b
DS		 345 } else
346 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 347
348 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
349
350 write_lock_bh(&ipv6_sk_mc_lock);
351 }
352 write_unlock_bh(&ipv6_sk_mc_lock);
353}
354
355int ip6_mc_source(int add, int omode, struct sock *sk,
356 struct group_source_req *pgsr)
357{
358 struct in6_addr *source, *group;
359 struct ipv6_mc_socklist *pmc;
360 struct net_device *dev;
361 struct inet6_dev *idev;
362 struct ipv6_pinfo *inet6 = inet6_sk(sk);
363 struct ip6_sf_socklist *psl;
3b1e0a65 364 struct net *net = sock_net(sk);
1da177e4 365 int i, j, rv;
c9e3e8b6 366 int leavegroup = 0;
5ab4a6c8 367 int pmclocked = 0;
1da177e4
LT		 368 int err;
369
370 if (pgsr->gsr_group.ss_family != AF_INET6 ||
371 pgsr->gsr_source.ss_family != AF_INET6)
372 return -EINVAL;
373
374 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
375 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
376
377 if (!ipv6_addr_is_multicast(group))
378 return -EINVAL;
379
b8ad0cbc 380 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
1da177e4
LT		 381 if (!idev)
382 return -ENODEV;
383 dev = idev->dev;
384
385 err = -EADDRNOTAVAIL;
386
c9e3e8b6 387 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 388 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
389 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
390 continue;
391 if (ipv6_addr_equal(&pmc->addr, group))
392 break;
393 }
917f2f10
DS		 394 if (!pmc) { /* must have a prior join */
395 err = -EINVAL;
1da177e4 396 goto done;
917f2f10 397 }
1da177e4
LT		 398 /* if a source filter was set, must be the same mode as before */
399 if (pmc->sflist) {
917f2f10
DS		 400 if (pmc->sfmode != omode) {
401 err = -EINVAL;
1da177e4 402 goto done;
917f2f10 403 }
1da177e4
LT		 404 } else if (pmc->sfmode != omode) {
405 /* allow mode switches for empty-set filters */
406 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
407 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
408 pmc->sfmode = omode;
409 }
410
5ab4a6c8
DS		 411 write_lock_bh(&pmc->sflock);
412 pmclocked = 1;
413
1da177e4
LT		 414 psl = pmc->sflist;
415 if (!add) {
416 if (!psl)
917f2f10 417 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 418 rv = !0;
419 for (i=0; i<psl->sl_count; i++) {
420 rv = memcmp(&psl->sl_addr[i], source,
421 sizeof(struct in6_addr));
422 if (rv == 0)
423 break;
424 }
425 if (rv) /* source not found */
917f2f10 426 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 427
c9e3e8b6
DS		 428 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
429 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
430 leavegroup = 1;
431 goto done;
432 }
433
1da177e4
LT		 434 /* update the interface filter */
435 ip6_mc_del_src(idev, group, omode, 1, source, 1);
436
437 for (j=i+1; j<psl->sl_count; j++)
438 psl->sl_addr[j-1] = psl->sl_addr[j];
439 psl->sl_count--;
440 err = 0;
441 goto done;
442 }
443 /* else, add a new source to the filter */
444
445 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
446 err = -ENOBUFS;
447 goto done;
448 }
449 if (!psl || psl->sl_count == psl->sl_max) {
450 struct ip6_sf_socklist *newpsl;
451 int count = IP6_SFBLOCK;
452
453 if (psl)
454 count += psl->sl_max;
8b3a7005 455 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 456 if (!newpsl) {
457 err = -ENOBUFS;
458 goto done;
459 }
460 newpsl->sl_max = count;
461 newpsl->sl_count = count - IP6_SFBLOCK;
462 if (psl) {
463 for (i=0; i<psl->sl_count; i++)
464 newpsl->sl_addr[i] = psl->sl_addr[i];
465 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
466 }
467 pmc->sflist = psl = newpsl;
468 }
469 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
470 for (i=0; i<psl->sl_count; i++) {
471 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
472 if (rv == 0)
473 break;
474 }
475 if (rv == 0) /* address already there is an error */
476 goto done;
477 for (j=psl->sl_count-1; j>=i; j--)
478 psl->sl_addr[j+1] = psl->sl_addr[j];
479 psl->sl_addr[i] = *source;
480 psl->sl_count++;
481 err = 0;
482 /* update the interface list */
483 ip6_mc_add_src(idev, group, omode, 1, source, 1);
484done:
5ab4a6c8
DS		 485 if (pmclocked)
486 write_unlock_bh(&pmc->sflock);
c9e3e8b6 487 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 488 read_unlock_bh(&idev->lock);
489 in6_dev_put(idev);
490 dev_put(dev);
c9e3e8b6
DS		 491 if (leavegroup)
492 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 493 return err;
494}
495
496int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
497{
498 struct in6_addr *group;
499 struct ipv6_mc_socklist *pmc;
500 struct net_device *dev;
501 struct inet6_dev *idev;
502 struct ipv6_pinfo *inet6 = inet6_sk(sk);
503 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 504 struct net *net = sock_net(sk);
9951f036 505 int leavegroup = 0;
1da177e4
LT		 506 int i, err;
507
508 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
509
510 if (!ipv6_addr_is_multicast(group))
511 return -EINVAL;
512 if (gsf->gf_fmode != MCAST_INCLUDE &&
513 gsf->gf_fmode != MCAST_EXCLUDE)
514 return -EINVAL;
515
b8ad0cbc 516 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 517
518 if (!idev)
519 return -ENODEV;
520 dev = idev->dev;
1da177e4 521
9c05989b 522 err = 0;
5ab4a6c8
DS		 523 read_lock_bh(&ipv6_sk_mc_lock);
524
9951f036
DS		 525 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
526 leavegroup = 1;
527 goto done;
528 }
529
1da177e4
LT		 530 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
531 if (pmc->ifindex != gsf->gf_interface)
532 continue;
533 if (ipv6_addr_equal(&pmc->addr, group))
534 break;
535 }
917f2f10
DS		 536 if (!pmc) { /* must have a prior join */
537 err = -EINVAL;
1da177e4 538 goto done;
917f2f10 539 }
1da177e4 540 if (gsf->gf_numsrc) {
8b3a7005
KK		 541 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
542 GFP_ATOMIC);
1da177e4
LT		 543 if (!newpsl) {
544 err = -ENOBUFS;
545 goto done;
546 }
547 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
548 for (i=0; i<newpsl->sl_count; ++i) {
549 struct sockaddr_in6 *psin6;
550
551 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
552 newpsl->sl_addr[i] = psin6->sin6_addr;
553 }
554 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
555 newpsl->sl_count, newpsl->sl_addr, 0);
556 if (err) {
557 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
558 goto done;
559 }
8713dbf0 560 } else {
1da177e4 561 newpsl = NULL;
8713dbf0
YZ		 562 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
563 }
5ab4a6c8
DS		 564
565 write_lock_bh(&pmc->sflock);
1da177e4
LT		 566 psl = pmc->sflist;
567 if (psl) {
568 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
569 psl->sl_count, psl->sl_addr, 0);
570 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
571 } else
572 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
573 pmc->sflist = newpsl;
574 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 575 write_unlock_bh(&pmc->sflock);
917f2f10 576 err = 0;
1da177e4 577done:
5ab4a6c8 578 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 579 read_unlock_bh(&idev->lock);
580 in6_dev_put(idev);
581 dev_put(dev);
9951f036
DS		 582 if (leavegroup)
583 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 584 return err;
585}
586
587int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
588 struct group_filter __user *optval, int __user *optlen)
589{
590 int err, i, count, copycount;
591 struct in6_addr *group;
592 struct ipv6_mc_socklist *pmc;
593 struct inet6_dev *idev;
594 struct net_device *dev;
595 struct ipv6_pinfo *inet6 = inet6_sk(sk);
596 struct ip6_sf_socklist *psl;
3b1e0a65 597 struct net *net = sock_net(sk);
1da177e4
LT		 598
599 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
600
601 if (!ipv6_addr_is_multicast(group))
602 return -EINVAL;
603
b8ad0cbc 604 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 605
606 if (!idev)
607 return -ENODEV;
608
609 dev = idev->dev;
610
611 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 612 /*
613 * changes to the ipv6_mc_list require the socket lock and
614 * a read lock on ip6_sk_mc_lock. We have the socket lock,
615 * so reading the list is safe.
616 */
1da177e4
LT		 617
618 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
619 if (pmc->ifindex != gsf->gf_interface)
620 continue;
621 if (ipv6_addr_equal(group, &pmc->addr))
622 break;
623 }
624 if (!pmc) /* must have a prior join */
625 goto done;
626 gsf->gf_fmode = pmc->sfmode;
627 psl = pmc->sflist;
628 count = psl ? psl->sl_count : 0;
629 read_unlock_bh(&idev->lock);
630 in6_dev_put(idev);
631 dev_put(dev);
632
633 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
634 gsf->gf_numsrc = count;
635 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
636 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
637 return -EFAULT;
638 }
5ab4a6c8
DS		 639 /* changes to psl require the socket lock, a read lock on
640 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
641 * have the socket lock, so reading here is safe.
642 */
1da177e4
LT		 643 for (i=0; i<copycount; i++) {
644 struct sockaddr_in6 *psin6;
645 struct sockaddr_storage ss;
646
647 psin6 = (struct sockaddr_in6 *)&ss;
648 memset(&ss, 0, sizeof(ss));
649 psin6->sin6_family = AF_INET6;
650 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 651 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 652 return -EFAULT;
653 }
654 return 0;
655done:
656 read_unlock_bh(&idev->lock);
657 in6_dev_put(idev);
658 dev_put(dev);
659 return err;
660}
661
9acd9f3a
YH		 662int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
663 const struct in6_addr *src_addr)
1da177e4
LT		 664{
665 struct ipv6_pinfo *np = inet6_sk(sk);
666 struct ipv6_mc_socklist *mc;
667 struct ip6_sf_socklist *psl;
668 int rv = 1;
669
670 read_lock(&ipv6_sk_mc_lock);
671 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
672 if (ipv6_addr_equal(&mc->addr, mc_addr))
673 break;
674 }
675 if (!mc) {
676 read_unlock(&ipv6_sk_mc_lock);
677 return 1;
678 }
5ab4a6c8 679 read_lock(&mc->sflock);
1da177e4
LT		 680 psl = mc->sflist;
681 if (!psl) {
682 rv = mc->sfmode == MCAST_EXCLUDE;
683 } else {
684 int i;
685
686 for (i=0; i<psl->sl_count; i++) {
687 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
688 break;
689 }
690 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
691 rv = 0;
692 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
693 rv = 0;
694 }
5ab4a6c8 695 read_unlock(&mc->sflock);
1da177e4
LT		 696 read_unlock(&ipv6_sk_mc_lock);
697
698 return rv;
699}
700
701static void ma_put(struct ifmcaddr6 *mc)
702{
703 if (atomic_dec_and_test(&mc->mca_refcnt)) {
704 in6_dev_put(mc->idev);
705 kfree(mc);
706 }
707}
708
709static void igmp6_group_added(struct ifmcaddr6 *mc)
710{
711 struct net_device *dev = mc->idev->dev;
712 char buf[MAX_ADDR_LEN];
713
714 spin_lock_bh(&mc->mca_lock);
715 if (!(mc->mca_flags&MAF_LOADED)) {
716 mc->mca_flags |= MAF_LOADED;
717 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
718 dev_mc_add(dev, buf, dev->addr_len, 0);
719 }
720 spin_unlock_bh(&mc->mca_lock);
721
722 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
723 return;
724
725 if (MLD_V1_SEEN(mc->idev)) {
726 igmp6_join_group(mc);
727 return;
728 }
729 /* else v2 */
730
731 mc->mca_crcount = mc->idev->mc_qrv;
732 mld_ifc_event(mc->idev);
733}
734
735static void igmp6_group_dropped(struct ifmcaddr6 *mc)
736{
737 struct net_device *dev = mc->idev->dev;
738 char buf[MAX_ADDR_LEN];
739
740 spin_lock_bh(&mc->mca_lock);
741 if (mc->mca_flags&MAF_LOADED) {
742 mc->mca_flags &= ~MAF_LOADED;
743 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
744 dev_mc_delete(dev, buf, dev->addr_len, 0);
745 }
746
747 if (mc->mca_flags & MAF_NOREPORT)
748 goto done;
749 spin_unlock_bh(&mc->mca_lock);
750
751 if (!mc->idev->dead)
752 igmp6_leave_group(mc);
753
754 spin_lock_bh(&mc->mca_lock);
755 if (del_timer(&mc->mca_timer))
756 atomic_dec(&mc->mca_refcnt);
757done:
758 ip6_mc_clear_src(mc);
759 spin_unlock_bh(&mc->mca_lock);
760}
761
762/*
763 * deleted ifmcaddr6 manipulation
764 */
765static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
766{
767 struct ifmcaddr6 *pmc;
768
769 /* this is an "ifmcaddr6" for convenience; only the fields below
770 * are actually used. In particular, the refcnt and users are not
771 * used for management of the delete list. Using the same structure
772 * for deleted items allows change reports to use common code with
773 * non-deleted or query-response MCA's.
774 */
0c600eda 775 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 776 if (!pmc)
777 return;
0c600eda 778
1da177e4
LT		 779 spin_lock_bh(&im->mca_lock);
780 spin_lock_init(&pmc->mca_lock);
781 pmc->idev = im->idev;
782 in6_dev_hold(idev);
783 pmc->mca_addr = im->mca_addr;
784 pmc->mca_crcount = idev->mc_qrv;
785 pmc->mca_sfmode = im->mca_sfmode;
786 if (pmc->mca_sfmode == MCAST_INCLUDE) {
787 struct ip6_sf_list *psf;
788
789 pmc->mca_tomb = im->mca_tomb;
790 pmc->mca_sources = im->mca_sources;
791 im->mca_tomb = im->mca_sources = NULL;
792 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
793 psf->sf_crcount = pmc->mca_crcount;
794 }
795 spin_unlock_bh(&im->mca_lock);
796
797 write_lock_bh(&idev->mc_lock);
798 pmc->next = idev->mc_tomb;
799 idev->mc_tomb = pmc;
800 write_unlock_bh(&idev->mc_lock);
801}
802
803static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
804{
805 struct ifmcaddr6 *pmc, *pmc_prev;
806 struct ip6_sf_list *psf, *psf_next;
807
808 write_lock_bh(&idev->mc_lock);
809 pmc_prev = NULL;
810 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
811 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
812 break;
813 pmc_prev = pmc;
814 }
815 if (pmc) {
816 if (pmc_prev)
817 pmc_prev->next = pmc->next;
818 else
819 idev->mc_tomb = pmc->next;
820 }
821 write_unlock_bh(&idev->mc_lock);
822 if (pmc) {
823 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
824 psf_next = psf->sf_next;
825 kfree(psf);
826 }
827 in6_dev_put(pmc->idev);
828 kfree(pmc);
829 }
830}
831
832static void mld_clear_delrec(struct inet6_dev *idev)
833{
834 struct ifmcaddr6 *pmc, *nextpmc;
835
836 write_lock_bh(&idev->mc_lock);
837 pmc = idev->mc_tomb;
838 idev->mc_tomb = NULL;
839 write_unlock_bh(&idev->mc_lock);
840
841 for (; pmc; pmc = nextpmc) {
842 nextpmc = pmc->next;
843 ip6_mc_clear_src(pmc);
844 in6_dev_put(pmc->idev);
845 kfree(pmc);
846 }
847
848 /* clear dead sources, too */
849 read_lock_bh(&idev->lock);
850 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
851 struct ip6_sf_list *psf, *psf_next;
852
853 spin_lock_bh(&pmc->mca_lock);
854 psf = pmc->mca_tomb;
855 pmc->mca_tomb = NULL;
856 spin_unlock_bh(&pmc->mca_lock);
857 for (; psf; psf=psf_next) {
858 psf_next = psf->sf_next;
859 kfree(psf);
860 }
861 }
862 read_unlock_bh(&idev->lock);
863}
864
865
866/*
867 * device multicast group inc (add if not found)
868 */
9acd9f3a 869int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 870{
871 struct ifmcaddr6 *mc;
872 struct inet6_dev *idev;
873
874 idev = in6_dev_get(dev);
875
876 if (idev == NULL)
877 return -EINVAL;
878
879 write_lock_bh(&idev->lock);
880 if (idev->dead) {
881 write_unlock_bh(&idev->lock);
882 in6_dev_put(idev);
883 return -ENODEV;
884 }
885
886 for (mc = idev->mc_list; mc; mc = mc->next) {
887 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
888 mc->mca_users++;
889 write_unlock_bh(&idev->lock);
890 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
891 NULL, 0);
892 in6_dev_put(idev);
893 return 0;
894 }
895 }
896
897 /*
898 * not found: create a new one.
899 */
900
0c600eda 901 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 902
903 if (mc == NULL) {
904 write_unlock_bh(&idev->lock);
905 in6_dev_put(idev);
906 return -ENOMEM;
907 }
908
b24b8a24 909 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4
LT		 910
911 ipv6_addr_copy(&mc->mca_addr, addr);
912 mc->idev = idev;
913 mc->mca_users = 1;
914 /* mca_stamp should be updated upon changes */
915 mc->mca_cstamp = mc->mca_tstamp = jiffies;
916 atomic_set(&mc->mca_refcnt, 2);
917 spin_lock_init(&mc->mca_lock);
918
919 /* initial mode is (EX, empty) */
920 mc->mca_sfmode = MCAST_EXCLUDE;
921 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
922
923 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
924 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
925 mc->mca_flags |= MAF_NOREPORT;
926
927 mc->next = idev->mc_list;
928 idev->mc_list = mc;
929 write_unlock_bh(&idev->lock);
930
931 mld_del_delrec(idev, &mc->mca_addr);
932 igmp6_group_added(mc);
933 ma_put(mc);
934 return 0;
935}
936
937/*
938 * device multicast group del
939 */
9acd9f3a 940int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 941{
942 struct ifmcaddr6 *ma, **map;
943
944 write_lock_bh(&idev->lock);
945 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
946 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
947 if (--ma->mca_users == 0) {
948 *map = ma->next;
949 write_unlock_bh(&idev->lock);
950
951 igmp6_group_dropped(ma);
952
953 ma_put(ma);
954 return 0;
955 }
956 write_unlock_bh(&idev->lock);
957 return 0;
958 }
959 }
960 write_unlock_bh(&idev->lock);
961
962 return -ENOENT;
963}
964
9acd9f3a 965int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 966{
967 struct inet6_dev *idev = in6_dev_get(dev);
968 int err;
969
970 if (!idev)
971 return -ENODEV;
972
973 err = __ipv6_dev_mc_dec(idev, addr);
974
975 in6_dev_put(idev);
976
977 return err;
978}
979
980/*
981 * identify MLD packets for MLD filter exceptions
982 */
983int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
984{
985 struct icmp6hdr *pic;
986
987 if (nexthdr != IPPROTO_ICMPV6)
988 return 0;
989
990 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
991 return 0;
992
cc70ab26 993 pic = icmp6_hdr(skb);
1da177e4
LT		 994
995 switch (pic->icmp6_type) {
996 case ICMPV6_MGM_QUERY:
997 case ICMPV6_MGM_REPORT:
998 case ICMPV6_MGM_REDUCTION:
999 case ICMPV6_MLD2_REPORT:
1000 return 1;
1001 default:
1002 break;
1003 }
1004 return 0;
1005}
1006
1007/*
1008 * check if the interface/address pair is valid
1009 */
9acd9f3a
YH		 1010int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1011 const struct in6_addr *src_addr)
1da177e4
LT		 1012{
1013 struct inet6_dev *idev;
1014 struct ifmcaddr6 *mc;
1015 int rv = 0;
1016
1017 idev = in6_dev_get(dev);
1018 if (idev) {
1019 read_lock_bh(&idev->lock);
1020 for (mc = idev->mc_list; mc; mc=mc->next) {
1021 if (ipv6_addr_equal(&mc->mca_addr, group))
1022 break;
1023 }
1024 if (mc) {
1025 if (src_addr && !ipv6_addr_any(src_addr)) {
1026 struct ip6_sf_list *psf;
1027
1028 spin_lock_bh(&mc->mca_lock);
1029 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1030 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1031 break;
1032 }
1033 if (psf)
1034 rv = psf->sf_count[MCAST_INCLUDE] ||
1035 psf->sf_count[MCAST_EXCLUDE] !=
1036 mc->mca_sfcount[MCAST_EXCLUDE];
1037 else
1038 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1039 spin_unlock_bh(&mc->mca_lock);
1040 } else
1041 rv = 1; /* don't filter unspecified source */
1042 }
1043 read_unlock_bh(&idev->lock);
1044 in6_dev_put(idev);
1045 }
1046 return rv;
1047}
1048
1049static void mld_gq_start_timer(struct inet6_dev *idev)
1050{
1051 int tv = net_random() % idev->mc_maxdelay;
1052
1053 idev->mc_gq_running = 1;
1054 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1055 in6_dev_hold(idev);
1056}
1057
1058static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1059{
1060 int tv = net_random() % delay;
1061
1062 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1063 in6_dev_hold(idev);
1064}
1065
1066/*
1067 * IGMP handling (alias multicast ICMPv6 messages)
1068 */
1069
1070static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1071{
1072 unsigned long delay = resptime;
1073
1074 /* Do not start timer for these addresses */
1075 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1076 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1077 return;
1078
1079 if (del_timer(&ma->mca_timer)) {
1080 atomic_dec(&ma->mca_refcnt);
1081 delay = ma->mca_timer.expires - jiffies;
1082 }
1083
1084 if (delay >= resptime) {
1085 if (resptime)
1086 delay = net_random() % resptime;
1087 else
1088 delay = 1;
1089 }
1090 ma->mca_timer.expires = jiffies + delay;
1091 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1092 atomic_inc(&ma->mca_refcnt);
1093 ma->mca_flags |= MAF_TIMER_RUNNING;
1094}
1095
5ab4a6c8
DS		 1096/* mark EXCLUDE-mode sources */
1097static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1098 struct in6_addr *srcs)
1099{
1100 struct ip6_sf_list *psf;
1101 int i, scount;
1102
1103 scount = 0;
1104 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1105 if (scount == nsrcs)
1106 break;
5ab4a6c8
DS		 1107 for (i=0; i<nsrcs; i++) {
1108 /* skip inactive filters */
1109 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1110 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1111 psf->sf_count[MCAST_EXCLUDE])
1112 continue;
1113 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1114 scount++;
1115 break;
1116 }
1117 }
1118 }
1119 pmc->mca_flags &= ~MAF_GSQUERY;
1120 if (scount == nsrcs) /* all sources excluded */
1121 return 0;
1122 return 1;
1123}
1124
1125static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1126 struct in6_addr *srcs)
1127{
1128 struct ip6_sf_list *psf;
1129 int i, scount;
1130
1131 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1132 return mld_xmarksources(pmc, nsrcs, srcs);
1133
1134 /* mark INCLUDE-mode sources */
1135
1136 scount = 0;
1137 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1138 if (scount == nsrcs)
1139 break;
1140 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1141 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1142 psf->sf_gsresp = 1;
1143 scount++;
1144 break;
1145 }
5ab4a6c8
DS		 1146 }
1147 }
1148 if (!scount) {
1149 pmc->mca_flags &= ~MAF_GSQUERY;
1150 return 0;
1da177e4 1151 }
5ab4a6c8
DS		 1152 pmc->mca_flags |= MAF_GSQUERY;
1153 return 1;
1da177e4
LT		 1154}
1155
1156int igmp6_event_query(struct sk_buff *skb)
1157{
97300b5f 1158 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1159 struct ifmcaddr6 *ma;
1160 struct in6_addr *group;
1161 unsigned long max_delay;
1162 struct inet6_dev *idev;
1163 struct icmp6hdr *hdr;
1164 int group_type;
1165 int mark = 0;
1166 int len;
1167
1168 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1169 return -EINVAL;
1170
1171 /* compute payload length excluding extension headers */
0660e03f 1172 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1173 len -= skb_network_header_len(skb);
1da177e4
LT		 1174
1175 /* Drop queries with not link local source */
0660e03f 1176 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1177 return -EINVAL;
1178
1179 idev = in6_dev_get(skb->dev);
1180
1181 if (idev == NULL)
1182 return 0;
1183
cc70ab26 1184 hdr = icmp6_hdr(skb);
1da177e4
LT		 1185 group = (struct in6_addr *) (hdr + 1);
1186 group_type = ipv6_addr_type(group);
1187
1188 if (group_type != IPV6_ADDR_ANY &&
1189 !(group_type&IPV6_ADDR_MULTICAST)) {
1190 in6_dev_put(idev);
1191 return -EINVAL;
1192 }
1193
1194 if (len == 24) {
1195 int switchback;
1196 /* MLDv1 router present */
1197
1198 /* Translate milliseconds to jiffies */
1199 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1200
1201 switchback = (idev->mc_qrv + 1) * max_delay;
1202 idev->mc_v1_seen = jiffies + switchback;
1203
1204 /* cancel the interface change timer */
1205 idev->mc_ifc_count = 0;
1206 if (del_timer(&idev->mc_ifc_timer))
1207 __in6_dev_put(idev);
1208 /* clear deleted report items */
1209 mld_clear_delrec(idev);
1210 } else if (len >= 28) {
1ab1457c 1211 int srcs_offset = sizeof(struct mld2_query) -
97300b5f
YZ		 1212 sizeof(struct icmp6hdr);
1213 if (!pskb_may_pull(skb, srcs_offset)) {
1214 in6_dev_put(idev);
1215 return -EINVAL;
1216 }
9c70220b 1217 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1da177e4
LT		 1218 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1219 if (!max_delay)
1220 max_delay = 1;
1221 idev->mc_maxdelay = max_delay;
1222 if (mlh2->qrv)
1223 idev->mc_qrv = mlh2->qrv;
1224 if (group_type == IPV6_ADDR_ANY) { /* general query */
1225 if (mlh2->nsrcs) {
1226 in6_dev_put(idev);
1227 return -EINVAL; /* no sources allowed */
1228 }
1229 mld_gq_start_timer(idev);
1230 in6_dev_put(idev);
1231 return 0;
1232 }
1233 /* mark sources to include, if group & source-specific */
97300b5f 1234 if (mlh2->nsrcs != 0) {
1ab1457c 1235 if (!pskb_may_pull(skb, srcs_offset +
5ab4a6c8 1236 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1237 in6_dev_put(idev);
1238 return -EINVAL;
1239 }
9c70220b 1240 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1241 mark = 1;
1242 }
1da177e4
LT		 1243 } else {
1244 in6_dev_put(idev);
1245 return -EINVAL;
1246 }
1247
1248 read_lock_bh(&idev->lock);
1249 if (group_type == IPV6_ADDR_ANY) {
1250 for (ma = idev->mc_list; ma; ma=ma->next) {
1251 spin_lock_bh(&ma->mca_lock);
1252 igmp6_group_queried(ma, max_delay);
1253 spin_unlock_bh(&ma->mca_lock);
1254 }
1255 } else {
1256 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1257 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1258 continue;
1259 spin_lock_bh(&ma->mca_lock);
1260 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1261 /* gsquery <- gsquery && mark */
1262 if (!mark)
1263 ma->mca_flags &= ~MAF_GSQUERY;
1264 } else {
1265 /* gsquery <- mark */
1266 if (mark)
1267 ma->mca_flags |= MAF_GSQUERY;
1268 else
1269 ma->mca_flags &= ~MAF_GSQUERY;
1270 }
5ab4a6c8 1271 if (!(ma->mca_flags & MAF_GSQUERY) ||
7add2a43 1272 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
5ab4a6c8 1273 igmp6_group_queried(ma, max_delay);
1da177e4 1274 spin_unlock_bh(&ma->mca_lock);
7add2a43 1275 break;
1da177e4
LT		 1276 }
1277 }
1278 read_unlock_bh(&idev->lock);
1279 in6_dev_put(idev);
1280
1281 return 0;
1282}
1283
1284
1285int igmp6_event_report(struct sk_buff *skb)
1286{
1287 struct ifmcaddr6 *ma;
1288 struct in6_addr *addrp;
1289 struct inet6_dev *idev;
1290 struct icmp6hdr *hdr;
1291 int addr_type;
1292
1293 /* Our own report looped back. Ignore it. */
1294 if (skb->pkt_type == PACKET_LOOPBACK)
1295 return 0;
1296
24c69275
DS		 1297 /* send our report if the MC router may not have heard this report */
1298 if (skb->pkt_type != PACKET_MULTICAST &&
1299 skb->pkt_type != PACKET_BROADCAST)
1300 return 0;
1301
1da177e4
LT		 1302 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1303 return -EINVAL;
1304
cc70ab26 1305 hdr = icmp6_hdr(skb);
1da177e4
LT		 1306
1307 /* Drop reports with not link local source */
0660e03f 1308 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1309 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1310 !(addr_type&IPV6_ADDR_LINKLOCAL))
1311 return -EINVAL;
1312
1313 addrp = (struct in6_addr *) (hdr + 1);
1314
1315 idev = in6_dev_get(skb->dev);
1316 if (idev == NULL)
1317 return -ENODEV;
1318
1319 /*
1320 * Cancel the timer for this group
1321 */
1322
1323 read_lock_bh(&idev->lock);
1324 for (ma = idev->mc_list; ma; ma=ma->next) {
1325 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1326 spin_lock(&ma->mca_lock);
1327 if (del_timer(&ma->mca_timer))
1328 atomic_dec(&ma->mca_refcnt);
1329 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1330 spin_unlock(&ma->mca_lock);
1331 break;
1332 }
1333 }
1334 read_unlock_bh(&idev->lock);
1335 in6_dev_put(idev);
1336 return 0;
1337}
1338
1339static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1340 int gdeleted, int sdeleted)
1341{
1342 switch (type) {
1343 case MLD2_MODE_IS_INCLUDE:
1344 case MLD2_MODE_IS_EXCLUDE:
1345 if (gdeleted || sdeleted)
1346 return 0;
5ab4a6c8
DS		 1347 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1348 if (pmc->mca_sfmode == MCAST_INCLUDE)
1349 return 1;
1350 /* don't include if this source is excluded
1351 * in all filters
1352 */
1353 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1354 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1355 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1356 psf->sf_count[MCAST_EXCLUDE];
1357 }
1358 return 0;
1da177e4
LT		 1359 case MLD2_CHANGE_TO_INCLUDE:
1360 if (gdeleted || sdeleted)
1361 return 0;
1362 return psf->sf_count[MCAST_INCLUDE] != 0;
1363 case MLD2_CHANGE_TO_EXCLUDE:
1364 if (gdeleted || sdeleted)
1365 return 0;
1366 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1367 psf->sf_count[MCAST_INCLUDE])
1368 return 0;
1369 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1370 psf->sf_count[MCAST_EXCLUDE];
1371 case MLD2_ALLOW_NEW_SOURCES:
1372 if (gdeleted || !psf->sf_crcount)
1373 return 0;
1374 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1375 case MLD2_BLOCK_OLD_SOURCES:
1376 if (pmc->mca_sfmode == MCAST_INCLUDE)
1377 return gdeleted || (psf->sf_crcount && sdeleted);
1378 return psf->sf_crcount && !gdeleted && !sdeleted;
1379 }
1380 return 0;
1381}
1382
1383static int
1384mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1385{
1386 struct ip6_sf_list *psf;
1387 int scount = 0;
1388
1389 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1390 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1391 continue;
1392 scount++;
1393 }
1394 return scount;
1395}
1396
1397static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1398{
c346dca1 1399 struct net *net = dev_net(dev);
b8ad0cbc 1400 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1401 struct sk_buff *skb;
1402 struct mld2_report *pmr;
1403 struct in6_addr addr_buf;
d7aabf22 1404 const struct in6_addr *saddr;
1da177e4
LT		 1405 int err;
1406 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1407 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1408 IPV6_TLV_PADN, 0 };
1409
1410 /* we assume size > sizeof(ra) here */
f5184d26 1411 skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
1da177e4 1412
cfcabdcc 1413 if (!skb)
1da177e4
LT		 1414 return NULL;
1415
1416 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1417
95c385b4 1418 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1419 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1420 * use unspecified address as the source address
1da177e4
LT		 1421 * when a valid link-local address is not available.
1422 */
d7aabf22
YH		 1423 saddr = &in6addr_any;
1424 } else
1425 saddr = &addr_buf;
1da177e4 1426
d7aabf22 1427 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4
LT		 1428
1429 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1430
27a884dc 1431 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1432 skb_put(skb, sizeof(*pmr));
1433 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1434 pmr->type = ICMPV6_MLD2_REPORT;
1435 pmr->resv1 = 0;
1436 pmr->csum = 0;
1437 pmr->resv2 = 0;
1438 pmr->ngrec = 0;
1439 return skb;
1440}
1441
1442static void mld_sendpack(struct sk_buff *skb)
1443{
0660e03f 1444 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1445 struct mld2_report *pmr =
1446 (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1447 int payload_len, mldlen;
1448 struct inet6_dev *idev = in6_dev_get(skb->dev);
c346dca1 1449 struct net *net = dev_net(skb->dev);
1da177e4 1450 int err;
41927178 1451 struct flowi fl;
1da177e4 1452
a11d206d 1453 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
27a884dc
ACM		 1454 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1455 mldlen = skb->tail - skb->transport_header;
1da177e4
LT		 1456 pip6->payload_len = htons(payload_len);
1457
1458 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
9c70220b
ACM		 1459 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1460 mldlen, 0));
41927178
YH		 1461
1462 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1463
1464 if (!skb->dst) {
1465 err = -ENOMEM;
1466 goto err_out;
1467 }
1468
b8ad0cbc 1469 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
41927178
YH		 1470 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1471 skb->dev->ifindex);
1472
1473 err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1474 if (err)
1475 goto err_out;
1476
6e23ae2a 1477 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1478 dst_output);
1479out:
1da177e4 1480 if (!err) {
14878f75
DS		 1481 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1482 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1483 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1da177e4 1484 } else
14878f75 1485 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1486
1487 if (likely(idev != NULL))
1488 in6_dev_put(idev);
41927178
YH		 1489 return;
1490
1491err_out:
1492 kfree_skb(skb);
1493 goto out;
1da177e4
LT		 1494}
1495
1496static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1497{
fab10fe3 1498 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1499}
1500
1501static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1502 int type, struct mld2_grec **ppgr)
1503{
1504 struct net_device *dev = pmc->idev->dev;
1505 struct mld2_report *pmr;
1506 struct mld2_grec *pgr;
1507
1508 if (!skb)
1509 skb = mld_newpack(dev, dev->mtu);
1510 if (!skb)
1511 return NULL;
1512 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1513 pgr->grec_type = type;
1514 pgr->grec_auxwords = 0;
1515 pgr->grec_nsrcs = 0;
1516 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1517 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1518 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1519 *ppgr = pgr;
1520 return skb;
1521}
1522
1523#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1524 skb_tailroom(skb)) : 0)
1525
1526static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1527 int type, int gdeleted, int sdeleted)
1528{
1529 struct net_device *dev = pmc->idev->dev;
1530 struct mld2_report *pmr;
1531 struct mld2_grec *pgr = NULL;
1532 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1533 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1534
1535 if (pmc->mca_flags & MAF_NOREPORT)
1536 return skb;
1537
1538 isquery = type == MLD2_MODE_IS_INCLUDE ||
1539 type == MLD2_MODE_IS_EXCLUDE;
1540 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1541 type == MLD2_CHANGE_TO_EXCLUDE;
1542
5ab4a6c8
DS		 1543 stotal = scount = 0;
1544
1da177e4
LT		 1545 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1546
5ab4a6c8
DS		 1547 if (!*psf_list)
1548 goto empty_source;
1549
9c70220b 1550 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1551
1552 /* EX and TO_EX get a fresh packet, if needed */
1553 if (truncate) {
1554 if (pmr && pmr->ngrec &&
1555 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1556 if (skb)
1557 mld_sendpack(skb);
1558 skb = mld_newpack(dev, dev->mtu);
1559 }
1560 }
1561 first = 1;
1da177e4
LT		 1562 psf_prev = NULL;
1563 for (psf=*psf_list; psf; psf=psf_next) {
1564 struct in6_addr *psrc;
1565
1566 psf_next = psf->sf_next;
1567
1568 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1569 psf_prev = psf;
1570 continue;
1571 }
1572
1573 /* clear marks on query responses */
1574 if (isquery)
1575 psf->sf_gsresp = 0;
1576
1577 if (AVAILABLE(skb) < sizeof(*psrc) +
1578 first*sizeof(struct mld2_grec)) {
1579 if (truncate && !first)
1580 break; /* truncate these */
1581 if (pgr)
1582 pgr->grec_nsrcs = htons(scount);
1583 if (skb)
1584 mld_sendpack(skb);
1585 skb = mld_newpack(dev, dev->mtu);
1586 first = 1;
1587 scount = 0;
1588 }
1589 if (first) {
1590 skb = add_grhead(skb, pmc, type, &pgr);
1591 first = 0;
1592 }
cc63f70b
AD		 1593 if (!skb)
1594 return NULL;
1da177e4
LT		 1595 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1596 *psrc = psf->sf_addr;
5ab4a6c8 1597 scount++; stotal++;
1da177e4
LT		 1598 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1599 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1600 psf->sf_crcount--;
1601 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1602 if (psf_prev)
1603 psf_prev->sf_next = psf->sf_next;
1604 else
1605 *psf_list = psf->sf_next;
1606 kfree(psf);
1607 continue;
1608 }
1609 }
1610 psf_prev = psf;
1611 }
5ab4a6c8
DS		 1612
1613empty_source:
1614 if (!stotal) {
1615 if (type == MLD2_ALLOW_NEW_SOURCES ||
1616 type == MLD2_BLOCK_OLD_SOURCES)
1617 return skb;
1618 if (pmc->mca_crcount || isquery) {
1619 /* make sure we have room for group header */
1620 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1621 mld_sendpack(skb);
1622 skb = NULL; /* add_grhead will get a new one */
1623 }
1624 skb = add_grhead(skb, pmc, type, &pgr);
1625 }
1626 }
1da177e4
LT		 1627 if (pgr)
1628 pgr->grec_nsrcs = htons(scount);
1629
1630 if (isquery)
1631 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1632 return skb;
1633}
1634
1635static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1636{
1637 struct sk_buff *skb = NULL;
1638 int type;
1639
1640 if (!pmc) {
1641 read_lock_bh(&idev->lock);
1642 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1643 if (pmc->mca_flags & MAF_NOREPORT)
1644 continue;
1645 spin_lock_bh(&pmc->mca_lock);
1646 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1647 type = MLD2_MODE_IS_EXCLUDE;
1648 else
1649 type = MLD2_MODE_IS_INCLUDE;
1650 skb = add_grec(skb, pmc, type, 0, 0);
1651 spin_unlock_bh(&pmc->mca_lock);
1652 }
1653 read_unlock_bh(&idev->lock);
1654 } else {
1655 spin_lock_bh(&pmc->mca_lock);
1656 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1657 type = MLD2_MODE_IS_EXCLUDE;
1658 else
1659 type = MLD2_MODE_IS_INCLUDE;
1660 skb = add_grec(skb, pmc, type, 0, 0);
1661 spin_unlock_bh(&pmc->mca_lock);
1662 }
1663 if (skb)
1664 mld_sendpack(skb);
1665}
1666
1667/*
1668 * remove zero-count source records from a source filter list
1669 */
1670static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1671{
1672 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1673
1674 psf_prev = NULL;
1675 for (psf=*ppsf; psf; psf = psf_next) {
1676 psf_next = psf->sf_next;
1677 if (psf->sf_crcount == 0) {
1678 if (psf_prev)
1679 psf_prev->sf_next = psf->sf_next;
1680 else
1681 *ppsf = psf->sf_next;
1682 kfree(psf);
1683 } else
1684 psf_prev = psf;
1685 }
1686}
1687
1688static void mld_send_cr(struct inet6_dev *idev)
1689{
1690 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1691 struct sk_buff *skb = NULL;
1692 int type, dtype;
1693
1694 read_lock_bh(&idev->lock);
1695 write_lock_bh(&idev->mc_lock);
1696
1697 /* deleted MCA's */
1698 pmc_prev = NULL;
1699 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1700 pmc_next = pmc->next;
1701 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1702 type = MLD2_BLOCK_OLD_SOURCES;
1703 dtype = MLD2_BLOCK_OLD_SOURCES;
1704 skb = add_grec(skb, pmc, type, 1, 0);
1705 skb = add_grec(skb, pmc, dtype, 1, 1);
1706 }
1707 if (pmc->mca_crcount) {
1da177e4
LT		 1708 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1709 type = MLD2_CHANGE_TO_INCLUDE;
1710 skb = add_grec(skb, pmc, type, 1, 0);
1711 }
5ab4a6c8 1712 pmc->mca_crcount--;
1da177e4
LT		 1713 if (pmc->mca_crcount == 0) {
1714 mld_clear_zeros(&pmc->mca_tomb);
1715 mld_clear_zeros(&pmc->mca_sources);
1716 }
1717 }
1718 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1719 !pmc->mca_sources) {
1720 if (pmc_prev)
1721 pmc_prev->next = pmc_next;
1722 else
1723 idev->mc_tomb = pmc_next;
1724 in6_dev_put(pmc->idev);
1725 kfree(pmc);
1726 } else
1727 pmc_prev = pmc;
1728 }
1729 write_unlock_bh(&idev->mc_lock);
1730
1731 /* change recs */
1732 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1733 spin_lock_bh(&pmc->mca_lock);
1734 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1735 type = MLD2_BLOCK_OLD_SOURCES;
1736 dtype = MLD2_ALLOW_NEW_SOURCES;
1737 } else {
1738 type = MLD2_ALLOW_NEW_SOURCES;
1739 dtype = MLD2_BLOCK_OLD_SOURCES;
1740 }
1741 skb = add_grec(skb, pmc, type, 0, 0);
1742 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1743
1744 /* filter mode changes */
1745 if (pmc->mca_crcount) {
1da177e4
LT		 1746 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1747 type = MLD2_CHANGE_TO_EXCLUDE;
1748 else
1749 type = MLD2_CHANGE_TO_INCLUDE;
1750 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1751 pmc->mca_crcount--;
1da177e4
LT		 1752 }
1753 spin_unlock_bh(&pmc->mca_lock);
1754 }
1755 read_unlock_bh(&idev->lock);
1756 if (!skb)
1757 return;
1758 (void) mld_sendpack(skb);
1759}
1760
1761static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1762{
c346dca1 1763 struct net *net = dev_net(dev);
b8ad0cbc 1764 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1765 struct inet6_dev *idev;
1ab1457c
YH		 1766 struct sk_buff *skb;
1767 struct icmp6hdr *hdr;
d7aabf22 1768 const struct in6_addr *snd_addr, *saddr;
1da177e4
LT		 1769 struct in6_addr *addrp;
1770 struct in6_addr addr_buf;
1da177e4
LT		 1771 int err, len, payload_len, full_len;
1772 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1773 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1774 IPV6_TLV_PADN, 0 };
41927178 1775 struct flowi fl;
1da177e4 1776
a11d206d
YH		 1777 rcu_read_lock();
1778 IP6_INC_STATS(__in6_dev_get(dev),
1779 IPSTATS_MIB_OUTREQUESTS);
1780 rcu_read_unlock();
f3ee4010
YH		 1781 if (type == ICMPV6_MGM_REDUCTION)
1782 snd_addr = &in6addr_linklocal_allrouters;
1783 else
1784 snd_addr = addr;
1da177e4
LT		 1785
1786 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1787 payload_len = len + sizeof(ra);
1788 full_len = sizeof(struct ipv6hdr) + payload_len;
1789
f5184d26 1790 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1da177e4
LT		 1791
1792 if (skb == NULL) {
a11d206d
YH		 1793 rcu_read_lock();
1794 IP6_INC_STATS(__in6_dev_get(dev),
1795 IPSTATS_MIB_OUTDISCARDS);
1796 rcu_read_unlock();
1da177e4
LT		 1797 return;
1798 }
1799
1800 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1801
95c385b4 1802 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1803 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1804 * use unspecified address as the source address
1da177e4
LT		 1805 * when a valid link-local address is not available.
1806 */
d7aabf22
YH		 1807 saddr = &in6addr_any;
1808 } else
1809 saddr = &addr_buf;
1da177e4 1810
d7aabf22 1811 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4
LT		 1812
1813 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1814
1815 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1816 memset(hdr, 0, sizeof(struct icmp6hdr));
1817 hdr->icmp6_type = type;
1818
1819 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1820 ipv6_addr_copy(addrp, addr);
1821
d7aabf22 1822 hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1da177e4
LT		 1823 IPPROTO_ICMPV6,
1824 csum_partial((__u8 *) hdr, len, 0));
1825
1826 idev = in6_dev_get(skb->dev);
1827
41927178
YH		 1828 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1829 if (!skb->dst) {
1830 err = -ENOMEM;
1831 goto err_out;
1832 }
1833
b8ad0cbc 1834 icmpv6_flow_init(sk, &fl, type,
41927178
YH		 1835 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1836 skb->dev->ifindex);
1837
1838 err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1839 if (err)
1840 goto err_out;
1841
6e23ae2a 1842 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1843 dst_output);
1844out:
1da177e4 1845 if (!err) {
14878f75 1846 ICMP6MSGOUT_INC_STATS(idev, type);
1da177e4 1847 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
a11d206d 1848 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1da177e4 1849 } else
a11d206d 1850 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1851
1852 if (likely(idev != NULL))
1853 in6_dev_put(idev);
1854 return;
41927178
YH		 1855
1856err_out:
1857 kfree_skb(skb);
1858 goto out;
1da177e4
LT		 1859}
1860
1861static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1862 struct in6_addr *psfsrc)
1863{
1864 struct ip6_sf_list *psf, *psf_prev;
1865 int rv = 0;
1866
1867 psf_prev = NULL;
1868 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1869 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1870 break;
1871 psf_prev = psf;
1872 }
1873 if (!psf || psf->sf_count[sfmode] == 0) {
1874 /* source filter not found, or count wrong => bug */
1875 return -ESRCH;
1876 }
1877 psf->sf_count[sfmode]--;
1878 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1879 struct inet6_dev *idev = pmc->idev;
1880
1881 /* no more filters for this source */
1882 if (psf_prev)
1883 psf_prev->sf_next = psf->sf_next;
1884 else
1885 pmc->mca_sources = psf->sf_next;
1886 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1887 !MLD_V1_SEEN(idev)) {
1888 psf->sf_crcount = idev->mc_qrv;
1889 psf->sf_next = pmc->mca_tomb;
1890 pmc->mca_tomb = psf;
1891 rv = 1;
1892 } else
1893 kfree(psf);
1894 }
1895 return rv;
1896}
1897
1898static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1899 int sfmode, int sfcount, struct in6_addr *psfsrc,
1900 int delta)
1901{
1902 struct ifmcaddr6 *pmc;
1903 int changerec = 0;
1904 int i, err;
1905
1906 if (!idev)
1907 return -ENODEV;
1908 read_lock_bh(&idev->lock);
1909 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1910 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1911 break;
1912 }
1913 if (!pmc) {
1914 /* MCA not found?? bug */
1915 read_unlock_bh(&idev->lock);
1916 return -ESRCH;
1917 }
1918 spin_lock_bh(&pmc->mca_lock);
1919 sf_markstate(pmc);
1920 if (!delta) {
1921 if (!pmc->mca_sfcount[sfmode]) {
1922 spin_unlock_bh(&pmc->mca_lock);
1923 read_unlock_bh(&idev->lock);
1924 return -EINVAL;
1925 }
1926 pmc->mca_sfcount[sfmode]--;
1927 }
1928 err = 0;
1929 for (i=0; i<sfcount; i++) {
1930 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1931
1932 changerec |= rv > 0;
1933 if (!err && rv < 0)
1934 err = rv;
1935 }
1936 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1937 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1938 pmc->mca_sfcount[MCAST_INCLUDE]) {
1939 struct ip6_sf_list *psf;
1940
1941 /* filter mode change */
1942 pmc->mca_sfmode = MCAST_INCLUDE;
1943 pmc->mca_crcount = idev->mc_qrv;
1944 idev->mc_ifc_count = pmc->mca_crcount;
1945 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1946 psf->sf_crcount = 0;
1947 mld_ifc_event(pmc->idev);
1948 } else if (sf_setstate(pmc) || changerec)
1949 mld_ifc_event(pmc->idev);
1950 spin_unlock_bh(&pmc->mca_lock);
1951 read_unlock_bh(&idev->lock);
1952 return err;
1953}
1954
1955/*
1956 * Add multicast single-source filter to the interface list
1957 */
1958static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1959 struct in6_addr *psfsrc, int delta)
1960{
1961 struct ip6_sf_list *psf, *psf_prev;
1962
1963 psf_prev = NULL;
1964 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1965 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1966 break;
1967 psf_prev = psf;
1968 }
1969 if (!psf) {
0c600eda 1970 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1971 if (!psf)
1972 return -ENOBUFS;
0c600eda 1973
1da177e4
LT		 1974 psf->sf_addr = *psfsrc;
1975 if (psf_prev) {
1976 psf_prev->sf_next = psf;
1977 } else
1978 pmc->mca_sources = psf;
1979 }
1980 psf->sf_count[sfmode]++;
1981 return 0;
1982}
1983
1984static void sf_markstate(struct ifmcaddr6 *pmc)
1985{
1986 struct ip6_sf_list *psf;
1987 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1988
1989 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1990 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1991 psf->sf_oldin = mca_xcount ==
1992 psf->sf_count[MCAST_EXCLUDE] &&
1993 !psf->sf_count[MCAST_INCLUDE];
1994 } else
1995 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1996}
1997
1998static int sf_setstate(struct ifmcaddr6 *pmc)
1999{
7add2a43 2000 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 2001 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2002 int qrv = pmc->idev->mc_qrv;
2003 int new_in, rv;
2004
2005 rv = 0;
2006 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2007 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2008 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2009 !psf->sf_count[MCAST_INCLUDE];
2010 } else
2011 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 2012 if (new_in) {
2013 if (!psf->sf_oldin) {
e80e28b6 2014 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 2015
2016 for (dpsf=pmc->mca_tomb; dpsf;
2017 dpsf=dpsf->sf_next) {
2018 if (ipv6_addr_equal(&dpsf->sf_addr,
2019 &psf->sf_addr))
2020 break;
2021 prev = dpsf;
2022 }
2023 if (dpsf) {
2024 if (prev)
2025 prev->sf_next = dpsf->sf_next;
2026 else
2027 pmc->mca_tomb = dpsf->sf_next;
2028 kfree(dpsf);
2029 }
2030 psf->sf_crcount = qrv;
2031 rv++;
2032 }
2033 } else if (psf->sf_oldin) {
2034 psf->sf_crcount = 0;
2035 /*
2036 * add or update "delete" records if an active filter
2037 * is now inactive
2038 */
2039 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2040 if (ipv6_addr_equal(&dpsf->sf_addr,
2041 &psf->sf_addr))
2042 break;
2043 if (!dpsf) {
2044 dpsf = (struct ip6_sf_list *)
2045 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2046 if (!dpsf)
2047 continue;
2048 *dpsf = *psf;
2049 /* pmc->mca_lock held by callers */
2050 dpsf->sf_next = pmc->mca_tomb;
2051 pmc->mca_tomb = dpsf;
2052 }
2053 dpsf->sf_crcount = qrv;
1da177e4
LT		 2054 rv++;
2055 }
2056 }
2057 return rv;
2058}
2059
2060/*
2061 * Add multicast source filter list to the interface list
2062 */
2063static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2064 int sfmode, int sfcount, struct in6_addr *psfsrc,
2065 int delta)
2066{
2067 struct ifmcaddr6 *pmc;
2068 int isexclude;
2069 int i, err;
2070
2071 if (!idev)
2072 return -ENODEV;
2073 read_lock_bh(&idev->lock);
2074 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2075 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2076 break;
2077 }
2078 if (!pmc) {
2079 /* MCA not found?? bug */
2080 read_unlock_bh(&idev->lock);
2081 return -ESRCH;
2082 }
2083 spin_lock_bh(&pmc->mca_lock);
2084
2085 sf_markstate(pmc);
2086 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2087 if (!delta)
2088 pmc->mca_sfcount[sfmode]++;
2089 err = 0;
2090 for (i=0; i<sfcount; i++) {
2091 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2092 if (err)
2093 break;
2094 }
2095 if (err) {
2096 int j;
2097
2098 if (!delta)
2099 pmc->mca_sfcount[sfmode]--;
2100 for (j=0; j<i; j++)
2101 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2102 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2103 struct inet6_dev *idev = pmc->idev;
2104 struct ip6_sf_list *psf;
2105
2106 /* filter mode change */
2107 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2108 pmc->mca_sfmode = MCAST_EXCLUDE;
2109 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2110 pmc->mca_sfmode = MCAST_INCLUDE;
2111 /* else no filters; keep old mode for reports */
2112
2113 pmc->mca_crcount = idev->mc_qrv;
2114 idev->mc_ifc_count = pmc->mca_crcount;
2115 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2116 psf->sf_crcount = 0;
2117 mld_ifc_event(idev);
2118 } else if (sf_setstate(pmc))
2119 mld_ifc_event(idev);
2120 spin_unlock_bh(&pmc->mca_lock);
2121 read_unlock_bh(&idev->lock);
2122 return err;
2123}
2124
2125static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2126{
2127 struct ip6_sf_list *psf, *nextpsf;
2128
2129 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2130 nextpsf = psf->sf_next;
2131 kfree(psf);
2132 }
2133 pmc->mca_tomb = NULL;
2134 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2135 nextpsf = psf->sf_next;
2136 kfree(psf);
2137 }
2138 pmc->mca_sources = NULL;
2139 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2140 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2141 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2142}
2143
2144
2145static void igmp6_join_group(struct ifmcaddr6 *ma)
2146{
2147 unsigned long delay;
2148
2149 if (ma->mca_flags & MAF_NOREPORT)
2150 return;
2151
2152 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2153
2154 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2155
2156 spin_lock_bh(&ma->mca_lock);
2157 if (del_timer(&ma->mca_timer)) {
2158 atomic_dec(&ma->mca_refcnt);
2159 delay = ma->mca_timer.expires - jiffies;
2160 }
2161
2162 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2163 atomic_inc(&ma->mca_refcnt);
2164 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2165 spin_unlock_bh(&ma->mca_lock);
2166}
2167
2168static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2169 struct inet6_dev *idev)
2170{
2171 int err;
2172
5ab4a6c8
DS		 2173 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2174 * so no other readers or writers of iml or its sflist
2175 */
cfcabdcc 2176 if (!iml->sflist) {
1da177e4
LT		 2177 /* any-source empty exclude case */
2178 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2179 }
2180 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2181 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2182 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2183 iml->sflist = NULL;
2184 return err;
2185}
2186
2187static void igmp6_leave_group(struct ifmcaddr6 *ma)
2188{
2189 if (MLD_V1_SEEN(ma->idev)) {
2190 if (ma->mca_flags & MAF_LAST_REPORTER)
2191 igmp6_send(&ma->mca_addr, ma->idev->dev,
2192 ICMPV6_MGM_REDUCTION);
2193 } else {
2194 mld_add_delrec(ma->idev, ma);
2195 mld_ifc_event(ma->idev);
2196 }
2197}
2198
2199static void mld_gq_timer_expire(unsigned long data)
2200{
2201 struct inet6_dev *idev = (struct inet6_dev *)data;
2202
2203 idev->mc_gq_running = 0;
2204 mld_send_report(idev, NULL);
2205 __in6_dev_put(idev);
2206}
2207
2208static void mld_ifc_timer_expire(unsigned long data)
2209{
2210 struct inet6_dev *idev = (struct inet6_dev *)data;
2211
2212 mld_send_cr(idev);
2213 if (idev->mc_ifc_count) {
2214 idev->mc_ifc_count--;
2215 if (idev->mc_ifc_count)
2216 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2217 }
2218 __in6_dev_put(idev);
2219}
2220
2221static void mld_ifc_event(struct inet6_dev *idev)
2222{
2223 if (MLD_V1_SEEN(idev))
2224 return;
2225 idev->mc_ifc_count = idev->mc_qrv;
2226 mld_ifc_start_timer(idev, 1);
2227}
2228
2229
2230static void igmp6_timer_handler(unsigned long data)
2231{
2232 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2233
2234 if (MLD_V1_SEEN(ma->idev))
2235 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2236 else
2237 mld_send_report(ma->idev, ma);
2238
2239 spin_lock(&ma->mca_lock);
2240 ma->mca_flags |= MAF_LAST_REPORTER;
2241 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2242 spin_unlock(&ma->mca_lock);
2243 ma_put(ma);
2244}
2245
2246/* Device going down */
2247
2248void ipv6_mc_down(struct inet6_dev *idev)
2249{
2250 struct ifmcaddr6 *i;
2251
2252 /* Withdraw multicast list */
2253
2254 read_lock_bh(&idev->lock);
2255 idev->mc_ifc_count = 0;
2256 if (del_timer(&idev->mc_ifc_timer))
2257 __in6_dev_put(idev);
2258 idev->mc_gq_running = 0;
2259 if (del_timer(&idev->mc_gq_timer))
2260 __in6_dev_put(idev);
2261
2262 for (i = idev->mc_list; i; i=i->next)
2263 igmp6_group_dropped(i);
2264 read_unlock_bh(&idev->lock);
2265
2266 mld_clear_delrec(idev);
2267}
2268
2269
2270/* Device going up */
2271
2272void ipv6_mc_up(struct inet6_dev *idev)
2273{
2274 struct ifmcaddr6 *i;
2275
2276 /* Install multicast list, except for all-nodes (already installed) */
2277
2278 read_lock_bh(&idev->lock);
2279 for (i = idev->mc_list; i; i=i->next)
2280 igmp6_group_added(i);
2281 read_unlock_bh(&idev->lock);
2282}
2283
2284/* IPv6 device initialization. */
2285
2286void ipv6_mc_init_dev(struct inet6_dev *idev)
2287{
1da177e4
LT		 2288 write_lock_bh(&idev->lock);
2289 rwlock_init(&idev->mc_lock);
2290 idev->mc_gq_running = 0;
b24b8a24
PE		 2291 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2292 (unsigned long)idev);
1da177e4
LT		 2293 idev->mc_tomb = NULL;
2294 idev->mc_ifc_count = 0;
b24b8a24
PE		 2295 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2296 (unsigned long)idev);
1da177e4
LT		 2297 idev->mc_qrv = MLD_QRV_DEFAULT;
2298 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2299 idev->mc_v1_seen = 0;
2300 write_unlock_bh(&idev->lock);
1da177e4
LT		 2301}
2302
2303/*
2304 * Device is about to be destroyed: clean up.
2305 */
2306
2307void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2308{
2309 struct ifmcaddr6 *i;
1da177e4
LT		 2310
2311 /* Deactivate timers */
2312 ipv6_mc_down(idev);
2313
2314 /* Delete all-nodes address. */
1da177e4
LT		 2315 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2316 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2317 * fail.
2318 */
f3ee4010 2319 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2320
f3ee4010
YH		 2321 if (idev->cnf.forwarding)
2322 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT		 2323
2324 write_lock_bh(&idev->lock);
2325 while ((i = idev->mc_list) != NULL) {
2326 idev->mc_list = i->next;
2327 write_unlock_bh(&idev->lock);
2328
2329 igmp6_group_dropped(i);
2330 ma_put(i);
2331
2332 write_lock_bh(&idev->lock);
2333 }
2334 write_unlock_bh(&idev->lock);
2335}
2336
2337#ifdef CONFIG_PROC_FS
2338struct igmp6_mc_iter_state {
b8ad0cbc 2339 struct seq_net_private p;
1da177e4
LT		 2340 struct net_device *dev;
2341 struct inet6_dev *idev;
2342};
2343
2344#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2345
2346static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2347{
2348 struct ifmcaddr6 *im = NULL;
2349 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2350 struct net *net = seq_file_net(seq);
1da177e4 2351
7562f876 2352 state->idev = NULL;
b8ad0cbc 2353 for_each_netdev(net, state->dev) {
1da177e4
LT		 2354 struct inet6_dev *idev;
2355 idev = in6_dev_get(state->dev);
2356 if (!idev)
2357 continue;
2358 read_lock_bh(&idev->lock);
2359 im = idev->mc_list;
2360 if (im) {
2361 state->idev = idev;
2362 break;
2363 }
2364 read_unlock_bh(&idev->lock);
2365 in6_dev_put(idev);
2366 }
2367 return im;
2368}
2369
2370static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2371{
2372 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2373
2374 im = im->next;
2375 while (!im) {
2376 if (likely(state->idev != NULL)) {
2377 read_unlock_bh(&state->idev->lock);
2378 in6_dev_put(state->idev);
2379 }
7562f876 2380 state->dev = next_net_device(state->dev);
1da177e4
LT		 2381 if (!state->dev) {
2382 state->idev = NULL;
2383 break;
2384 }
2385 state->idev = in6_dev_get(state->dev);
2386 if (!state->idev)
2387 continue;
2388 read_lock_bh(&state->idev->lock);
2389 im = state->idev->mc_list;
2390 }
2391 return im;
2392}
2393
2394static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2395{
2396 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2397 if (im)
2398 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2399 --pos;
2400 return pos ? NULL : im;
2401}
2402
2403static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2404 __acquires(dev_base_lock)
1da177e4
LT		 2405{
2406 read_lock(&dev_base_lock);
2407 return igmp6_mc_get_idx(seq, *pos);
2408}
2409
2410static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2411{
2412 struct ifmcaddr6 *im;
2413 im = igmp6_mc_get_next(seq, v);
2414 ++*pos;
2415 return im;
2416}
2417
2418static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
9a429c49 2419 __releases(dev_base_lock)
1da177e4
LT		 2420{
2421 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2422 if (likely(state->idev != NULL)) {
2423 read_unlock_bh(&state->idev->lock);
2424 in6_dev_put(state->idev);
2425 state->idev = NULL;
2426 }
2427 state->dev = NULL;
2428 read_unlock(&dev_base_lock);
2429}
2430
2431static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2432{
2433 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2434 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2435
2436 seq_printf(seq,
1ab1457c 2437 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
1da177e4
LT		 2438 state->dev->ifindex, state->dev->name,
2439 NIP6(im->mca_addr),
2440 im->mca_users, im->mca_flags,
2441 (im->mca_flags&MAF_TIMER_RUNNING) ?
2442 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2443 return 0;
2444}
2445
56b3d975 2446static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2447 .start = igmp6_mc_seq_start,
2448 .next = igmp6_mc_seq_next,
2449 .stop = igmp6_mc_seq_stop,
2450 .show = igmp6_mc_seq_show,
2451};
2452
2453static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2454{
b8ad0cbc
DL		 2455 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2456 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2457}
2458
9a32144e 2459static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2460 .owner = THIS_MODULE,
2461 .open = igmp6_mc_seq_open,
2462 .read = seq_read,
2463 .llseek = seq_lseek,
b8ad0cbc 2464 .release = seq_release_net,
1da177e4
LT		 2465};
2466
2467struct igmp6_mcf_iter_state {
b8ad0cbc 2468 struct seq_net_private p;
1da177e4
LT		 2469 struct net_device *dev;
2470 struct inet6_dev *idev;
2471 struct ifmcaddr6 *im;
2472};
2473
2474#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2475
2476static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2477{
2478 struct ip6_sf_list *psf = NULL;
2479 struct ifmcaddr6 *im = NULL;
2480 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2481 struct net *net = seq_file_net(seq);
1da177e4 2482
7562f876
PE		 2483 state->idev = NULL;
2484 state->im = NULL;
b8ad0cbc 2485 for_each_netdev(net, state->dev) {
1da177e4
LT		 2486 struct inet6_dev *idev;
2487 idev = in6_dev_get(state->dev);
2488 if (unlikely(idev == NULL))
2489 continue;
2490 read_lock_bh(&idev->lock);
2491 im = idev->mc_list;
2492 if (likely(im != NULL)) {
2493 spin_lock_bh(&im->mca_lock);
2494 psf = im->mca_sources;
2495 if (likely(psf != NULL)) {
2496 state->im = im;
2497 state->idev = idev;
2498 break;
2499 }
2500 spin_unlock_bh(&im->mca_lock);
2501 }
2502 read_unlock_bh(&idev->lock);
2503 in6_dev_put(idev);
2504 }
2505 return psf;
2506}
2507
2508static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2509{
2510 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2511
2512 psf = psf->sf_next;
2513 while (!psf) {
2514 spin_unlock_bh(&state->im->mca_lock);
2515 state->im = state->im->next;
2516 while (!state->im) {
2517 if (likely(state->idev != NULL)) {
2518 read_unlock_bh(&state->idev->lock);
2519 in6_dev_put(state->idev);
2520 }
7562f876 2521 state->dev = next_net_device(state->dev);
1da177e4
LT		 2522 if (!state->dev) {
2523 state->idev = NULL;
2524 goto out;
2525 }
2526 state->idev = in6_dev_get(state->dev);
2527 if (!state->idev)
2528 continue;
2529 read_lock_bh(&state->idev->lock);
2530 state->im = state->idev->mc_list;
2531 }
2532 if (!state->im)
2533 break;
2534 spin_lock_bh(&state->im->mca_lock);
2535 psf = state->im->mca_sources;
2536 }
2537out:
2538 return psf;
2539}
2540
2541static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2542{
2543 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2544 if (psf)
2545 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2546 --pos;
2547 return pos ? NULL : psf;
2548}
2549
2550static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2551 __acquires(dev_base_lock)
1da177e4
LT		 2552{
2553 read_lock(&dev_base_lock);
2554 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2555}
2556
2557static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2558{
2559 struct ip6_sf_list *psf;
2560 if (v == SEQ_START_TOKEN)
2561 psf = igmp6_mcf_get_first(seq);
2562 else
2563 psf = igmp6_mcf_get_next(seq, v);
2564 ++*pos;
2565 return psf;
2566}
2567
2568static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
9a429c49 2569 __releases(dev_base_lock)
1da177e4
LT		 2570{
2571 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2572 if (likely(state->im != NULL)) {
2573 spin_unlock_bh(&state->im->mca_lock);
2574 state->im = NULL;
2575 }
2576 if (likely(state->idev != NULL)) {
2577 read_unlock_bh(&state->idev->lock);
2578 in6_dev_put(state->idev);
2579 state->idev = NULL;
2580 }
2581 state->dev = NULL;
2582 read_unlock(&dev_base_lock);
2583}
2584
2585static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2586{
2587 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2588 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2589
2590 if (v == SEQ_START_TOKEN) {
1ab1457c 2591 seq_printf(seq,
1da177e4 2592 "%3s %6s "
9343e79a 2593 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2594 "Device", "Multicast Address",
2595 "Source Address", "INC", "EXC");
2596 } else {
2597 seq_printf(seq,
9343e79a 2598 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
1da177e4
LT		 2599 state->dev->ifindex, state->dev->name,
2600 NIP6(state->im->mca_addr),
2601 NIP6(psf->sf_addr),
2602 psf->sf_count[MCAST_INCLUDE],
2603 psf->sf_count[MCAST_EXCLUDE]);
2604 }
2605 return 0;
2606}
2607
56b3d975 2608static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2609 .start = igmp6_mcf_seq_start,
2610 .next = igmp6_mcf_seq_next,
2611 .stop = igmp6_mcf_seq_stop,
2612 .show = igmp6_mcf_seq_show,
2613};
2614
2615static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2616{
b8ad0cbc
DL		 2617 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2618 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2619}
2620
9a32144e 2621static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2622 .owner = THIS_MODULE,
2623 .open = igmp6_mcf_seq_open,
2624 .read = seq_read,
2625 .llseek = seq_lseek,
b8ad0cbc 2626 .release = seq_release_net,
1da177e4 2627};
ea82edf7
DL		 2628
2629static int igmp6_proc_init(struct net *net)
2630{
2631 int err;
2632
2633 err = -ENOMEM;
2634 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2635 goto out;
2636 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2637 &igmp6_mcf_seq_fops))
2638 goto out_proc_net_igmp6;
2639
2640 err = 0;
2641out:
2642 return err;
2643
2644out_proc_net_igmp6:
2645 proc_net_remove(net, "igmp6");
2646 goto out;
2647}
2648
2649static void igmp6_proc_exit(struct net *net)
2650{
2651 proc_net_remove(net, "mcfilter6");
2652 proc_net_remove(net, "igmp6");
2653}
2654#else
2655static int igmp6_proc_init(struct net *net)
2656{
2657 return 0;
2658}
2659static void igmp6_proc_exit(struct net *net)
2660{
2661 ;
2662}
1da177e4
LT		 2663#endif
2664
b8ad0cbc 2665static int igmp6_net_init(struct net *net)
1da177e4 2666{
1da177e4
LT		 2667 int err;
2668
1ed8516f
DL		 2669 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2670 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 2671 if (err < 0) {
2672 printk(KERN_ERR
2673 "Failed to initialize the IGMP6 control socket (err %d).\n",
2674 err);
b8ad0cbc 2675 goto out;
1da177e4
LT		 2676 }
2677
1ed8516f 2678 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2679
ea82edf7
DL		 2680 err = igmp6_proc_init(net);
2681 if (err)
b8ad0cbc 2682 goto out_sock_create;
b8ad0cbc
DL		 2683out:
2684 return err;
2685
2686out_sock_create:
1ed8516f 2687 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2688 goto out;
1da177e4
LT		 2689}
2690
b8ad0cbc 2691static void igmp6_net_exit(struct net *net)
1da177e4 2692{
1ed8516f 2693 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2694 igmp6_proc_exit(net);
1da177e4 2695}
b8ad0cbc
DL		 2696
2697static struct pernet_operations igmp6_net_ops = {
2698 .init = igmp6_net_init,
2699 .exit = igmp6_net_exit,
2700};
2701
2702int __init igmp6_init(void)
2703{
2704 return register_pernet_subsys(&igmp6_net_ops);
2705}
2706
2707void igmp6_cleanup(void)
2708{
2709 unregister_pernet_subsys(&igmp6_net_ops);
2710}
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