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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
LT		 7 *
8 * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
9 *
1ab1457c 10 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
1da177e4
LT		 11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18/* Changes:
19 *
20 * yoshfuji : fix format of router-alert option
21 * YOSHIFUJI Hideaki @USAGI:
22 * Fixed source address for MLD message based on
23 * <draft-ietf-magma-mld-source-05.txt>.
24 * YOSHIFUJI Hideaki @USAGI:
25 * - Ignore Queries for invalid addresses.
26 * - MLD for link-local addresses.
27 * David L Stevens <dlstevens@us.ibm.com>:
28 * - MLDv2 support
29 */
30
1da177e4
LT		 31#include <linux/module.h>
32#include <linux/errno.h>
33#include <linux/types.h>
34#include <linux/string.h>
35#include <linux/socket.h>
36#include <linux/sockios.h>
37#include <linux/jiffies.h>
38#include <linux/times.h>
39#include <linux/net.h>
40#include <linux/in.h>
41#include <linux/in6.h>
42#include <linux/netdevice.h>
43#include <linux/if_arp.h>
44#include <linux/route.h>
45#include <linux/init.h>
46#include <linux/proc_fs.h>
47#include <linux/seq_file.h>
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>
62
63#include <net/ip6_checksum.h>
64
65/* Set to 3 to get tracing... */
66#define MCAST_DEBUG 2
67
68#if MCAST_DEBUG >= 3
69#define MDBG(x) printk x
70#else
71#define MDBG(x)
72#endif
73
74/*
75 * These header formats should be in a separate include file, but icmpv6.h
76 * doesn't have in6_addr defined in all cases, there is no __u128, and no
77 * other files reference these.
78 *
79 * +-DLS 4/14/03
80 */
81
82/* Multicast Listener Discovery version 2 headers */
83
84struct mld2_grec {
85 __u8 grec_type;
86 __u8 grec_auxwords;
8a74ff77 87 __be16 grec_nsrcs;
1da177e4
LT		 88 struct in6_addr grec_mca;
89 struct in6_addr grec_src[0];
90};
91
92struct mld2_report {
93 __u8 type;
94 __u8 resv1;
868c86bc 95 __sum16 csum;
8a74ff77
AV		 96 __be16 resv2;
97 __be16 ngrec;
1da177e4
LT		 98 struct mld2_grec grec[0];
99};
100
101struct mld2_query {
102 __u8 type;
103 __u8 code;
868c86bc 104 __sum16 csum;
8a74ff77
AV		 105 __be16 mrc;
106 __be16 resv1;
1da177e4
LT		 107 struct in6_addr mca;
108#if defined(__LITTLE_ENDIAN_BITFIELD)
109 __u8 qrv:3,
110 suppress:1,
111 resv2:4;
112#elif defined(__BIG_ENDIAN_BITFIELD)
113 __u8 resv2:4,
114 suppress:1,
115 qrv:3;
116#else
117#error "Please fix <asm/byteorder.h>"
118#endif
119 __u8 qqic;
8a74ff77 120 __be16 nsrcs;
1da177e4
LT		 121 struct in6_addr srcs[0];
122};
123
124static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
125
126/* Big mc list lock for all the sockets */
127static DEFINE_RWLOCK(ipv6_sk_mc_lock);
128
129static struct socket *igmp6_socket;
130
131int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
132
133static void igmp6_join_group(struct ifmcaddr6 *ma);
134static void igmp6_leave_group(struct ifmcaddr6 *ma);
135static void igmp6_timer_handler(unsigned long data);
136
137static void mld_gq_timer_expire(unsigned long data);
138static void mld_ifc_timer_expire(unsigned long data);
139static void mld_ifc_event(struct inet6_dev *idev);
140static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
141static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
142static void mld_clear_delrec(struct inet6_dev *idev);
143static int sf_setstate(struct ifmcaddr6 *pmc);
144static void sf_markstate(struct ifmcaddr6 *pmc);
145static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
146static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
147 int sfmode, int sfcount, struct in6_addr *psfsrc,
148 int delta);
149static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
150 int sfmode, int sfcount, struct in6_addr *psfsrc,
151 int delta);
152static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
153 struct inet6_dev *idev);
154
155
156#define IGMP6_UNSOLICITED_IVAL (10*HZ)
157#define MLD_QRV_DEFAULT 2
158
159#define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
160 (idev)->cnf.force_mld_version == 1 || \
161 ((idev)->mc_v1_seen && \
162 time_before(jiffies, (idev)->mc_v1_seen)))
163
164#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
165#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
166 ((value) < (thresh) ? (value) : \
f12baeab 167 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
1da177e4
LT		 168 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
169
170#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
171#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
172
6f4353d8 173#define IPV6_MLD_MAX_MSF 64
1da177e4 174
ab32ea5d 175int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 176
177/*
178 * socket join on multicast group
179 */
180
181int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
182{
183 struct net_device *dev = NULL;
184 struct ipv6_mc_socklist *mc_lst;
185 struct ipv6_pinfo *np = inet6_sk(sk);
186 int err;
187
188 if (!ipv6_addr_is_multicast(addr))
189 return -EINVAL;
190
c9e3e8b6
DS		 191 read_lock_bh(&ipv6_sk_mc_lock);
192 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
193 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
194 ipv6_addr_equal(&mc_lst->addr, addr)) {
195 read_unlock_bh(&ipv6_sk_mc_lock);
196 return -EADDRINUSE;
197 }
198 }
199 read_unlock_bh(&ipv6_sk_mc_lock);
200
1da177e4
LT		 201 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
202
203 if (mc_lst == NULL)
204 return -ENOMEM;
205
206 mc_lst->next = NULL;
207 ipv6_addr_copy(&mc_lst->addr, addr);
208
209 if (ifindex == 0) {
210 struct rt6_info *rt;
211 rt = rt6_lookup(addr, NULL, 0, 0);
212 if (rt) {
213 dev = rt->rt6i_dev;
214 dev_hold(dev);
215 dst_release(&rt->u.dst);
216 }
217 } else
218 dev = dev_get_by_index(ifindex);
219
220 if (dev == NULL) {
221 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
222 return -ENODEV;
223 }
224
225 mc_lst->ifindex = dev->ifindex;
226 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 227 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 228 mc_lst->sflist = NULL;
229
230 /*
231 * now add/increase the group membership on the device
232 */
233
234 err = ipv6_dev_mc_inc(dev, addr);
235
236 if (err) {
237 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
238 dev_put(dev);
239 return err;
240 }
241
242 write_lock_bh(&ipv6_sk_mc_lock);
243 mc_lst->next = np->ipv6_mc_list;
244 np->ipv6_mc_list = mc_lst;
245 write_unlock_bh(&ipv6_sk_mc_lock);
246
247 dev_put(dev);
248
249 return 0;
250}
251
252/*
253 * socket leave on multicast group
254 */
255int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
256{
257 struct ipv6_pinfo *np = inet6_sk(sk);
258 struct ipv6_mc_socklist *mc_lst, **lnk;
259
260 write_lock_bh(&ipv6_sk_mc_lock);
261 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
262 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
263 ipv6_addr_equal(&mc_lst->addr, addr)) {
264 struct net_device *dev;
265
266 *lnk = mc_lst->next;
267 write_unlock_bh(&ipv6_sk_mc_lock);
268
269 if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
270 struct inet6_dev *idev = in6_dev_get(dev);
271
acd6e00b 272 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 273 if (idev) {
1da177e4
LT		 274 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
275 in6_dev_put(idev);
276 }
277 dev_put(dev);
acd6e00b
DS		 278 } else
279 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 280 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
281 return 0;
282 }
283 }
284 write_unlock_bh(&ipv6_sk_mc_lock);
285
9951f036 286 return -EADDRNOTAVAIL;
1da177e4
LT		 287}
288
289static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
290{
291 struct net_device *dev = NULL;
292 struct inet6_dev *idev = NULL;
293
294 if (ifindex == 0) {
295 struct rt6_info *rt;
296
297 rt = rt6_lookup(group, NULL, 0, 0);
298 if (rt) {
299 dev = rt->rt6i_dev;
300 dev_hold(dev);
301 dst_release(&rt->u.dst);
302 }
303 } else
304 dev = dev_get_by_index(ifindex);
305
306 if (!dev)
307 return NULL;
308 idev = in6_dev_get(dev);
309 if (!idev) {
310 dev_put(dev);
311 return NULL;
312 }
313 read_lock_bh(&idev->lock);
314 if (idev->dead) {
315 read_unlock_bh(&idev->lock);
316 in6_dev_put(idev);
317 dev_put(dev);
318 return NULL;
319 }
320 return idev;
321}
322
323void ipv6_sock_mc_close(struct sock *sk)
324{
325 struct ipv6_pinfo *np = inet6_sk(sk);
326 struct ipv6_mc_socklist *mc_lst;
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
335 dev = dev_get_by_index(mc_lst->ifindex);
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;
364 int i, j, rv;
c9e3e8b6 365 int leavegroup = 0;
5ab4a6c8 366 int pmclocked = 0;
1da177e4
LT		 367 int err;
368
369 if (pgsr->gsr_group.ss_family != AF_INET6 ||
370 pgsr->gsr_source.ss_family != AF_INET6)
371 return -EINVAL;
372
373 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
374 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
375
376 if (!ipv6_addr_is_multicast(group))
377 return -EINVAL;
378
379 idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
380 if (!idev)
381 return -ENODEV;
382 dev = idev->dev;
383
384 err = -EADDRNOTAVAIL;
385
c9e3e8b6 386 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 387 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
389 continue;
390 if (ipv6_addr_equal(&pmc->addr, group))
391 break;
392 }
917f2f10
DS		 393 if (!pmc) { /* must have a prior join */
394 err = -EINVAL;
1da177e4 395 goto done;
917f2f10 396 }
1da177e4
LT		 397 /* if a source filter was set, must be the same mode as before */
398 if (pmc->sflist) {
917f2f10
DS		 399 if (pmc->sfmode != omode) {
400 err = -EINVAL;
1da177e4 401 goto done;
917f2f10 402 }
1da177e4
LT		 403 } else if (pmc->sfmode != omode) {
404 /* allow mode switches for empty-set filters */
405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
407 pmc->sfmode = omode;
408 }
409
5ab4a6c8
DS		 410 write_lock_bh(&pmc->sflock);
411 pmclocked = 1;
412
1da177e4
LT		 413 psl = pmc->sflist;
414 if (!add) {
415 if (!psl)
917f2f10 416 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 417 rv = !0;
418 for (i=0; i<psl->sl_count; i++) {
419 rv = memcmp(&psl->sl_addr[i], source,
420 sizeof(struct in6_addr));
421 if (rv == 0)
422 break;
423 }
424 if (rv) /* source not found */
917f2f10 425 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 426
c9e3e8b6
DS		 427 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
428 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
429 leavegroup = 1;
430 goto done;
431 }
432
1da177e4
LT		 433 /* update the interface filter */
434 ip6_mc_del_src(idev, group, omode, 1, source, 1);
435
436 for (j=i+1; j<psl->sl_count; j++)
437 psl->sl_addr[j-1] = psl->sl_addr[j];
438 psl->sl_count--;
439 err = 0;
440 goto done;
441 }
442 /* else, add a new source to the filter */
443
444 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
445 err = -ENOBUFS;
446 goto done;
447 }
448 if (!psl || psl->sl_count == psl->sl_max) {
449 struct ip6_sf_socklist *newpsl;
450 int count = IP6_SFBLOCK;
451
452 if (psl)
453 count += psl->sl_max;
8b3a7005 454 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 455 if (!newpsl) {
456 err = -ENOBUFS;
457 goto done;
458 }
459 newpsl->sl_max = count;
460 newpsl->sl_count = count - IP6_SFBLOCK;
461 if (psl) {
462 for (i=0; i<psl->sl_count; i++)
463 newpsl->sl_addr[i] = psl->sl_addr[i];
464 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
465 }
466 pmc->sflist = psl = newpsl;
467 }
468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
469 for (i=0; i<psl->sl_count; i++) {
470 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
471 if (rv == 0)
472 break;
473 }
474 if (rv == 0) /* address already there is an error */
475 goto done;
476 for (j=psl->sl_count-1; j>=i; j--)
477 psl->sl_addr[j+1] = psl->sl_addr[j];
478 psl->sl_addr[i] = *source;
479 psl->sl_count++;
480 err = 0;
481 /* update the interface list */
482 ip6_mc_add_src(idev, group, omode, 1, source, 1);
483done:
5ab4a6c8
DS		 484 if (pmclocked)
485 write_unlock_bh(&pmc->sflock);
c9e3e8b6 486 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 487 read_unlock_bh(&idev->lock);
488 in6_dev_put(idev);
489 dev_put(dev);
c9e3e8b6
DS		 490 if (leavegroup)
491 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 492 return err;
493}
494
495int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
496{
497 struct in6_addr *group;
498 struct ipv6_mc_socklist *pmc;
499 struct net_device *dev;
500 struct inet6_dev *idev;
501 struct ipv6_pinfo *inet6 = inet6_sk(sk);
502 struct ip6_sf_socklist *newpsl, *psl;
9951f036 503 int leavegroup = 0;
1da177e4
LT		 504 int i, err;
505
506 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
507
508 if (!ipv6_addr_is_multicast(group))
509 return -EINVAL;
510 if (gsf->gf_fmode != MCAST_INCLUDE &&
511 gsf->gf_fmode != MCAST_EXCLUDE)
512 return -EINVAL;
513
514 idev = ip6_mc_find_dev(group, gsf->gf_interface);
515
516 if (!idev)
517 return -ENODEV;
518 dev = idev->dev;
1da177e4 519
9c05989b 520 err = 0;
5ab4a6c8
DS		 521 read_lock_bh(&ipv6_sk_mc_lock);
522
9951f036
DS		 523 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
524 leavegroup = 1;
525 goto done;
526 }
527
1da177e4
LT		 528 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
529 if (pmc->ifindex != gsf->gf_interface)
530 continue;
531 if (ipv6_addr_equal(&pmc->addr, group))
532 break;
533 }
917f2f10
DS		 534 if (!pmc) { /* must have a prior join */
535 err = -EINVAL;
1da177e4 536 goto done;
917f2f10 537 }
1da177e4 538 if (gsf->gf_numsrc) {
8b3a7005
KK		 539 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
540 GFP_ATOMIC);
1da177e4
LT		 541 if (!newpsl) {
542 err = -ENOBUFS;
543 goto done;
544 }
545 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
546 for (i=0; i<newpsl->sl_count; ++i) {
547 struct sockaddr_in6 *psin6;
548
549 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
550 newpsl->sl_addr[i] = psin6->sin6_addr;
551 }
552 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
553 newpsl->sl_count, newpsl->sl_addr, 0);
554 if (err) {
555 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
556 goto done;
557 }
8713dbf0 558 } else {
1da177e4 559 newpsl = NULL;
8713dbf0
YZ		 560 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
561 }
5ab4a6c8
DS		 562
563 write_lock_bh(&pmc->sflock);
1da177e4
LT		 564 psl = pmc->sflist;
565 if (psl) {
566 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
567 psl->sl_count, psl->sl_addr, 0);
568 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
569 } else
570 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
571 pmc->sflist = newpsl;
572 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 573 write_unlock_bh(&pmc->sflock);
917f2f10 574 err = 0;
1da177e4 575done:
5ab4a6c8 576 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 577 read_unlock_bh(&idev->lock);
578 in6_dev_put(idev);
579 dev_put(dev);
9951f036
DS		 580 if (leavegroup)
581 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 582 return err;
583}
584
585int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
586 struct group_filter __user *optval, int __user *optlen)
587{
588 int err, i, count, copycount;
589 struct in6_addr *group;
590 struct ipv6_mc_socklist *pmc;
591 struct inet6_dev *idev;
592 struct net_device *dev;
593 struct ipv6_pinfo *inet6 = inet6_sk(sk);
594 struct ip6_sf_socklist *psl;
595
596 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
597
598 if (!ipv6_addr_is_multicast(group))
599 return -EINVAL;
600
601 idev = ip6_mc_find_dev(group, gsf->gf_interface);
602
603 if (!idev)
604 return -ENODEV;
605
606 dev = idev->dev;
607
608 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 609 /*
610 * changes to the ipv6_mc_list require the socket lock and
611 * a read lock on ip6_sk_mc_lock. We have the socket lock,
612 * so reading the list is safe.
613 */
1da177e4
LT		 614
615 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
616 if (pmc->ifindex != gsf->gf_interface)
617 continue;
618 if (ipv6_addr_equal(group, &pmc->addr))
619 break;
620 }
621 if (!pmc) /* must have a prior join */
622 goto done;
623 gsf->gf_fmode = pmc->sfmode;
624 psl = pmc->sflist;
625 count = psl ? psl->sl_count : 0;
626 read_unlock_bh(&idev->lock);
627 in6_dev_put(idev);
628 dev_put(dev);
629
630 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
631 gsf->gf_numsrc = count;
632 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
633 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
634 return -EFAULT;
635 }
5ab4a6c8
DS		 636 /* changes to psl require the socket lock, a read lock on
637 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
638 * have the socket lock, so reading here is safe.
639 */
1da177e4
LT		 640 for (i=0; i<copycount; i++) {
641 struct sockaddr_in6 *psin6;
642 struct sockaddr_storage ss;
643
644 psin6 = (struct sockaddr_in6 *)&ss;
645 memset(&ss, 0, sizeof(ss));
646 psin6->sin6_family = AF_INET6;
647 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 648 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 649 return -EFAULT;
650 }
651 return 0;
652done:
653 read_unlock_bh(&idev->lock);
654 in6_dev_put(idev);
655 dev_put(dev);
656 return err;
657}
658
659int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
660 struct in6_addr *src_addr)
661{
662 struct ipv6_pinfo *np = inet6_sk(sk);
663 struct ipv6_mc_socklist *mc;
664 struct ip6_sf_socklist *psl;
665 int rv = 1;
666
667 read_lock(&ipv6_sk_mc_lock);
668 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
669 if (ipv6_addr_equal(&mc->addr, mc_addr))
670 break;
671 }
672 if (!mc) {
673 read_unlock(&ipv6_sk_mc_lock);
674 return 1;
675 }
5ab4a6c8 676 read_lock(&mc->sflock);
1da177e4
LT		 677 psl = mc->sflist;
678 if (!psl) {
679 rv = mc->sfmode == MCAST_EXCLUDE;
680 } else {
681 int i;
682
683 for (i=0; i<psl->sl_count; i++) {
684 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
685 break;
686 }
687 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
688 rv = 0;
689 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
690 rv = 0;
691 }
5ab4a6c8 692 read_unlock(&mc->sflock);
1da177e4
LT		 693 read_unlock(&ipv6_sk_mc_lock);
694
695 return rv;
696}
697
698static void ma_put(struct ifmcaddr6 *mc)
699{
700 if (atomic_dec_and_test(&mc->mca_refcnt)) {
701 in6_dev_put(mc->idev);
702 kfree(mc);
703 }
704}
705
706static void igmp6_group_added(struct ifmcaddr6 *mc)
707{
708 struct net_device *dev = mc->idev->dev;
709 char buf[MAX_ADDR_LEN];
710
711 spin_lock_bh(&mc->mca_lock);
712 if (!(mc->mca_flags&MAF_LOADED)) {
713 mc->mca_flags |= MAF_LOADED;
714 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
715 dev_mc_add(dev, buf, dev->addr_len, 0);
716 }
717 spin_unlock_bh(&mc->mca_lock);
718
719 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
720 return;
721
722 if (MLD_V1_SEEN(mc->idev)) {
723 igmp6_join_group(mc);
724 return;
725 }
726 /* else v2 */
727
728 mc->mca_crcount = mc->idev->mc_qrv;
729 mld_ifc_event(mc->idev);
730}
731
732static void igmp6_group_dropped(struct ifmcaddr6 *mc)
733{
734 struct net_device *dev = mc->idev->dev;
735 char buf[MAX_ADDR_LEN];
736
737 spin_lock_bh(&mc->mca_lock);
738 if (mc->mca_flags&MAF_LOADED) {
739 mc->mca_flags &= ~MAF_LOADED;
740 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
741 dev_mc_delete(dev, buf, dev->addr_len, 0);
742 }
743
744 if (mc->mca_flags & MAF_NOREPORT)
745 goto done;
746 spin_unlock_bh(&mc->mca_lock);
747
748 if (!mc->idev->dead)
749 igmp6_leave_group(mc);
750
751 spin_lock_bh(&mc->mca_lock);
752 if (del_timer(&mc->mca_timer))
753 atomic_dec(&mc->mca_refcnt);
754done:
755 ip6_mc_clear_src(mc);
756 spin_unlock_bh(&mc->mca_lock);
757}
758
759/*
760 * deleted ifmcaddr6 manipulation
761 */
762static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
763{
764 struct ifmcaddr6 *pmc;
765
766 /* this is an "ifmcaddr6" for convenience; only the fields below
767 * are actually used. In particular, the refcnt and users are not
768 * used for management of the delete list. Using the same structure
769 * for deleted items allows change reports to use common code with
770 * non-deleted or query-response MCA's.
771 */
0c600eda 772 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 773 if (!pmc)
774 return;
0c600eda 775
1da177e4
LT		 776 spin_lock_bh(&im->mca_lock);
777 spin_lock_init(&pmc->mca_lock);
778 pmc->idev = im->idev;
779 in6_dev_hold(idev);
780 pmc->mca_addr = im->mca_addr;
781 pmc->mca_crcount = idev->mc_qrv;
782 pmc->mca_sfmode = im->mca_sfmode;
783 if (pmc->mca_sfmode == MCAST_INCLUDE) {
784 struct ip6_sf_list *psf;
785
786 pmc->mca_tomb = im->mca_tomb;
787 pmc->mca_sources = im->mca_sources;
788 im->mca_tomb = im->mca_sources = NULL;
789 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
790 psf->sf_crcount = pmc->mca_crcount;
791 }
792 spin_unlock_bh(&im->mca_lock);
793
794 write_lock_bh(&idev->mc_lock);
795 pmc->next = idev->mc_tomb;
796 idev->mc_tomb = pmc;
797 write_unlock_bh(&idev->mc_lock);
798}
799
800static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
801{
802 struct ifmcaddr6 *pmc, *pmc_prev;
803 struct ip6_sf_list *psf, *psf_next;
804
805 write_lock_bh(&idev->mc_lock);
806 pmc_prev = NULL;
807 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
808 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
809 break;
810 pmc_prev = pmc;
811 }
812 if (pmc) {
813 if (pmc_prev)
814 pmc_prev->next = pmc->next;
815 else
816 idev->mc_tomb = pmc->next;
817 }
818 write_unlock_bh(&idev->mc_lock);
819 if (pmc) {
820 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
821 psf_next = psf->sf_next;
822 kfree(psf);
823 }
824 in6_dev_put(pmc->idev);
825 kfree(pmc);
826 }
827}
828
829static void mld_clear_delrec(struct inet6_dev *idev)
830{
831 struct ifmcaddr6 *pmc, *nextpmc;
832
833 write_lock_bh(&idev->mc_lock);
834 pmc = idev->mc_tomb;
835 idev->mc_tomb = NULL;
836 write_unlock_bh(&idev->mc_lock);
837
838 for (; pmc; pmc = nextpmc) {
839 nextpmc = pmc->next;
840 ip6_mc_clear_src(pmc);
841 in6_dev_put(pmc->idev);
842 kfree(pmc);
843 }
844
845 /* clear dead sources, too */
846 read_lock_bh(&idev->lock);
847 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
848 struct ip6_sf_list *psf, *psf_next;
849
850 spin_lock_bh(&pmc->mca_lock);
851 psf = pmc->mca_tomb;
852 pmc->mca_tomb = NULL;
853 spin_unlock_bh(&pmc->mca_lock);
854 for (; psf; psf=psf_next) {
855 psf_next = psf->sf_next;
856 kfree(psf);
857 }
858 }
859 read_unlock_bh(&idev->lock);
860}
861
862
863/*
864 * device multicast group inc (add if not found)
865 */
866int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
867{
868 struct ifmcaddr6 *mc;
869 struct inet6_dev *idev;
870
871 idev = in6_dev_get(dev);
872
873 if (idev == NULL)
874 return -EINVAL;
875
876 write_lock_bh(&idev->lock);
877 if (idev->dead) {
878 write_unlock_bh(&idev->lock);
879 in6_dev_put(idev);
880 return -ENODEV;
881 }
882
883 for (mc = idev->mc_list; mc; mc = mc->next) {
884 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
885 mc->mca_users++;
886 write_unlock_bh(&idev->lock);
887 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
888 NULL, 0);
889 in6_dev_put(idev);
890 return 0;
891 }
892 }
893
894 /*
895 * not found: create a new one.
896 */
897
0c600eda 898 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 899
900 if (mc == NULL) {
901 write_unlock_bh(&idev->lock);
902 in6_dev_put(idev);
903 return -ENOMEM;
904 }
905
1da177e4
LT		 906 init_timer(&mc->mca_timer);
907 mc->mca_timer.function = igmp6_timer_handler;
908 mc->mca_timer.data = (unsigned long) mc;
909
910 ipv6_addr_copy(&mc->mca_addr, addr);
911 mc->idev = idev;
912 mc->mca_users = 1;
913 /* mca_stamp should be updated upon changes */
914 mc->mca_cstamp = mc->mca_tstamp = jiffies;
915 atomic_set(&mc->mca_refcnt, 2);
916 spin_lock_init(&mc->mca_lock);
917
918 /* initial mode is (EX, empty) */
919 mc->mca_sfmode = MCAST_EXCLUDE;
920 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
921
922 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
923 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
924 mc->mca_flags |= MAF_NOREPORT;
925
926 mc->next = idev->mc_list;
927 idev->mc_list = mc;
928 write_unlock_bh(&idev->lock);
929
930 mld_del_delrec(idev, &mc->mca_addr);
931 igmp6_group_added(mc);
932 ma_put(mc);
933 return 0;
934}
935
936/*
937 * device multicast group del
938 */
939int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
940{
941 struct ifmcaddr6 *ma, **map;
942
943 write_lock_bh(&idev->lock);
944 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
945 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
946 if (--ma->mca_users == 0) {
947 *map = ma->next;
948 write_unlock_bh(&idev->lock);
949
950 igmp6_group_dropped(ma);
951
952 ma_put(ma);
953 return 0;
954 }
955 write_unlock_bh(&idev->lock);
956 return 0;
957 }
958 }
959 write_unlock_bh(&idev->lock);
960
961 return -ENOENT;
962}
963
964int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
965{
966 struct inet6_dev *idev = in6_dev_get(dev);
967 int err;
968
969 if (!idev)
970 return -ENODEV;
971
972 err = __ipv6_dev_mc_dec(idev, addr);
973
974 in6_dev_put(idev);
975
976 return err;
977}
978
979/*
980 * identify MLD packets for MLD filter exceptions
981 */
982int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
983{
984 struct icmp6hdr *pic;
985
986 if (nexthdr != IPPROTO_ICMPV6)
987 return 0;
988
989 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
990 return 0;
991
cc70ab26 992 pic = icmp6_hdr(skb);
1da177e4
LT		 993
994 switch (pic->icmp6_type) {
995 case ICMPV6_MGM_QUERY:
996 case ICMPV6_MGM_REPORT:
997 case ICMPV6_MGM_REDUCTION:
998 case ICMPV6_MLD2_REPORT:
999 return 1;
1000 default:
1001 break;
1002 }
1003 return 0;
1004}
1005
1006/*
1007 * check if the interface/address pair is valid
1008 */
1009int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1010 struct in6_addr *src_addr)
1011{
1012 struct inet6_dev *idev;
1013 struct ifmcaddr6 *mc;
1014 int rv = 0;
1015
1016 idev = in6_dev_get(dev);
1017 if (idev) {
1018 read_lock_bh(&idev->lock);
1019 for (mc = idev->mc_list; mc; mc=mc->next) {
1020 if (ipv6_addr_equal(&mc->mca_addr, group))
1021 break;
1022 }
1023 if (mc) {
1024 if (src_addr && !ipv6_addr_any(src_addr)) {
1025 struct ip6_sf_list *psf;
1026
1027 spin_lock_bh(&mc->mca_lock);
1028 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1029 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1030 break;
1031 }
1032 if (psf)
1033 rv = psf->sf_count[MCAST_INCLUDE] ||
1034 psf->sf_count[MCAST_EXCLUDE] !=
1035 mc->mca_sfcount[MCAST_EXCLUDE];
1036 else
1037 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1038 spin_unlock_bh(&mc->mca_lock);
1039 } else
1040 rv = 1; /* don't filter unspecified source */
1041 }
1042 read_unlock_bh(&idev->lock);
1043 in6_dev_put(idev);
1044 }
1045 return rv;
1046}
1047
1048static void mld_gq_start_timer(struct inet6_dev *idev)
1049{
1050 int tv = net_random() % idev->mc_maxdelay;
1051
1052 idev->mc_gq_running = 1;
1053 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1054 in6_dev_hold(idev);
1055}
1056
1057static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1058{
1059 int tv = net_random() % delay;
1060
1061 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1062 in6_dev_hold(idev);
1063}
1064
1065/*
1066 * IGMP handling (alias multicast ICMPv6 messages)
1067 */
1068
1069static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1070{
1071 unsigned long delay = resptime;
1072
1073 /* Do not start timer for these addresses */
1074 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1075 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1076 return;
1077
1078 if (del_timer(&ma->mca_timer)) {
1079 atomic_dec(&ma->mca_refcnt);
1080 delay = ma->mca_timer.expires - jiffies;
1081 }
1082
1083 if (delay >= resptime) {
1084 if (resptime)
1085 delay = net_random() % resptime;
1086 else
1087 delay = 1;
1088 }
1089 ma->mca_timer.expires = jiffies + delay;
1090 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1091 atomic_inc(&ma->mca_refcnt);
1092 ma->mca_flags |= MAF_TIMER_RUNNING;
1093}
1094
5ab4a6c8
DS		 1095/* mark EXCLUDE-mode sources */
1096static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1097 struct in6_addr *srcs)
1098{
1099 struct ip6_sf_list *psf;
1100 int i, scount;
1101
1102 scount = 0;
1103 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1104 if (scount == nsrcs)
1105 break;
5ab4a6c8
DS		 1106 for (i=0; i<nsrcs; i++) {
1107 /* skip inactive filters */
1108 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1109 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1110 psf->sf_count[MCAST_EXCLUDE])
1111 continue;
1112 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1113 scount++;
1114 break;
1115 }
1116 }
1117 }
1118 pmc->mca_flags &= ~MAF_GSQUERY;
1119 if (scount == nsrcs) /* all sources excluded */
1120 return 0;
1121 return 1;
1122}
1123
1124static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1125 struct in6_addr *srcs)
1126{
1127 struct ip6_sf_list *psf;
1128 int i, scount;
1129
1130 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1131 return mld_xmarksources(pmc, nsrcs, srcs);
1132
1133 /* mark INCLUDE-mode sources */
1134
1135 scount = 0;
1136 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1137 if (scount == nsrcs)
1138 break;
1139 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1140 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1141 psf->sf_gsresp = 1;
1142 scount++;
1143 break;
1144 }
5ab4a6c8
DS		 1145 }
1146 }
1147 if (!scount) {
1148 pmc->mca_flags &= ~MAF_GSQUERY;
1149 return 0;
1da177e4 1150 }
5ab4a6c8
DS		 1151 pmc->mca_flags |= MAF_GSQUERY;
1152 return 1;
1da177e4
LT		 1153}
1154
1155int igmp6_event_query(struct sk_buff *skb)
1156{
97300b5f 1157 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1158 struct ifmcaddr6 *ma;
1159 struct in6_addr *group;
1160 unsigned long max_delay;
1161 struct inet6_dev *idev;
1162 struct icmp6hdr *hdr;
1163 int group_type;
1164 int mark = 0;
1165 int len;
1166
1167 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1168 return -EINVAL;
1169
1170 /* compute payload length excluding extension headers */
0660e03f 1171 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1172 len -= skb_network_header_len(skb);
1da177e4
LT		 1173
1174 /* Drop queries with not link local source */
0660e03f 1175 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1176 return -EINVAL;
1177
1178 idev = in6_dev_get(skb->dev);
1179
1180 if (idev == NULL)
1181 return 0;
1182
cc70ab26 1183 hdr = icmp6_hdr(skb);
1da177e4
LT		 1184 group = (struct in6_addr *) (hdr + 1);
1185 group_type = ipv6_addr_type(group);
1186
1187 if (group_type != IPV6_ADDR_ANY &&
1188 !(group_type&IPV6_ADDR_MULTICAST)) {
1189 in6_dev_put(idev);
1190 return -EINVAL;
1191 }
1192
1193 if (len == 24) {
1194 int switchback;
1195 /* MLDv1 router present */
1196
1197 /* Translate milliseconds to jiffies */
1198 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1199
1200 switchback = (idev->mc_qrv + 1) * max_delay;
1201 idev->mc_v1_seen = jiffies + switchback;
1202
1203 /* cancel the interface change timer */
1204 idev->mc_ifc_count = 0;
1205 if (del_timer(&idev->mc_ifc_timer))
1206 __in6_dev_put(idev);
1207 /* clear deleted report items */
1208 mld_clear_delrec(idev);
1209 } else if (len >= 28) {
1ab1457c 1210 int srcs_offset = sizeof(struct mld2_query) -
97300b5f
YZ		 1211 sizeof(struct icmp6hdr);
1212 if (!pskb_may_pull(skb, srcs_offset)) {
1213 in6_dev_put(idev);
1214 return -EINVAL;
1215 }
9c70220b 1216 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1da177e4
LT		 1217 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1218 if (!max_delay)
1219 max_delay = 1;
1220 idev->mc_maxdelay = max_delay;
1221 if (mlh2->qrv)
1222 idev->mc_qrv = mlh2->qrv;
1223 if (group_type == IPV6_ADDR_ANY) { /* general query */
1224 if (mlh2->nsrcs) {
1225 in6_dev_put(idev);
1226 return -EINVAL; /* no sources allowed */
1227 }
1228 mld_gq_start_timer(idev);
1229 in6_dev_put(idev);
1230 return 0;
1231 }
1232 /* mark sources to include, if group & source-specific */
97300b5f 1233 if (mlh2->nsrcs != 0) {
1ab1457c 1234 if (!pskb_may_pull(skb, srcs_offset +
5ab4a6c8 1235 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1236 in6_dev_put(idev);
1237 return -EINVAL;
1238 }
9c70220b 1239 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1240 mark = 1;
1241 }
1da177e4
LT		 1242 } else {
1243 in6_dev_put(idev);
1244 return -EINVAL;
1245 }
1246
1247 read_lock_bh(&idev->lock);
1248 if (group_type == IPV6_ADDR_ANY) {
1249 for (ma = idev->mc_list; ma; ma=ma->next) {
1250 spin_lock_bh(&ma->mca_lock);
1251 igmp6_group_queried(ma, max_delay);
1252 spin_unlock_bh(&ma->mca_lock);
1253 }
1254 } else {
1255 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1256 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1257 continue;
1258 spin_lock_bh(&ma->mca_lock);
1259 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1260 /* gsquery <- gsquery && mark */
1261 if (!mark)
1262 ma->mca_flags &= ~MAF_GSQUERY;
1263 } else {
1264 /* gsquery <- mark */
1265 if (mark)
1266 ma->mca_flags |= MAF_GSQUERY;
1267 else
1268 ma->mca_flags &= ~MAF_GSQUERY;
1269 }
5ab4a6c8 1270 if (!(ma->mca_flags & MAF_GSQUERY) ||
7add2a43 1271 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
5ab4a6c8 1272 igmp6_group_queried(ma, max_delay);
1da177e4 1273 spin_unlock_bh(&ma->mca_lock);
7add2a43 1274 break;
1da177e4
LT		 1275 }
1276 }
1277 read_unlock_bh(&idev->lock);
1278 in6_dev_put(idev);
1279
1280 return 0;
1281}
1282
1283
1284int igmp6_event_report(struct sk_buff *skb)
1285{
1286 struct ifmcaddr6 *ma;
1287 struct in6_addr *addrp;
1288 struct inet6_dev *idev;
1289 struct icmp6hdr *hdr;
1290 int addr_type;
1291
1292 /* Our own report looped back. Ignore it. */
1293 if (skb->pkt_type == PACKET_LOOPBACK)
1294 return 0;
1295
24c69275
DS		 1296 /* send our report if the MC router may not have heard this report */
1297 if (skb->pkt_type != PACKET_MULTICAST &&
1298 skb->pkt_type != PACKET_BROADCAST)
1299 return 0;
1300
1da177e4
LT		 1301 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1302 return -EINVAL;
1303
cc70ab26 1304 hdr = icmp6_hdr(skb);
1da177e4
LT		 1305
1306 /* Drop reports with not link local source */
0660e03f 1307 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1308 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1309 !(addr_type&IPV6_ADDR_LINKLOCAL))
1310 return -EINVAL;
1311
1312 addrp = (struct in6_addr *) (hdr + 1);
1313
1314 idev = in6_dev_get(skb->dev);
1315 if (idev == NULL)
1316 return -ENODEV;
1317
1318 /*
1319 * Cancel the timer for this group
1320 */
1321
1322 read_lock_bh(&idev->lock);
1323 for (ma = idev->mc_list; ma; ma=ma->next) {
1324 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1325 spin_lock(&ma->mca_lock);
1326 if (del_timer(&ma->mca_timer))
1327 atomic_dec(&ma->mca_refcnt);
1328 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1329 spin_unlock(&ma->mca_lock);
1330 break;
1331 }
1332 }
1333 read_unlock_bh(&idev->lock);
1334 in6_dev_put(idev);
1335 return 0;
1336}
1337
1338static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1339 int gdeleted, int sdeleted)
1340{
1341 switch (type) {
1342 case MLD2_MODE_IS_INCLUDE:
1343 case MLD2_MODE_IS_EXCLUDE:
1344 if (gdeleted || sdeleted)
1345 return 0;
5ab4a6c8
DS		 1346 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1347 if (pmc->mca_sfmode == MCAST_INCLUDE)
1348 return 1;
1349 /* don't include if this source is excluded
1350 * in all filters
1351 */
1352 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1353 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1354 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1355 psf->sf_count[MCAST_EXCLUDE];
1356 }
1357 return 0;
1da177e4
LT		 1358 case MLD2_CHANGE_TO_INCLUDE:
1359 if (gdeleted || sdeleted)
1360 return 0;
1361 return psf->sf_count[MCAST_INCLUDE] != 0;
1362 case MLD2_CHANGE_TO_EXCLUDE:
1363 if (gdeleted || sdeleted)
1364 return 0;
1365 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1366 psf->sf_count[MCAST_INCLUDE])
1367 return 0;
1368 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1369 psf->sf_count[MCAST_EXCLUDE];
1370 case MLD2_ALLOW_NEW_SOURCES:
1371 if (gdeleted || !psf->sf_crcount)
1372 return 0;
1373 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1374 case MLD2_BLOCK_OLD_SOURCES:
1375 if (pmc->mca_sfmode == MCAST_INCLUDE)
1376 return gdeleted || (psf->sf_crcount && sdeleted);
1377 return psf->sf_crcount && !gdeleted && !sdeleted;
1378 }
1379 return 0;
1380}
1381
1382static int
1383mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1384{
1385 struct ip6_sf_list *psf;
1386 int scount = 0;
1387
1388 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1389 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1390 continue;
1391 scount++;
1392 }
1393 return scount;
1394}
1395
1396static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1397{
1398 struct sock *sk = igmp6_socket->sk;
1399 struct sk_buff *skb;
1400 struct mld2_report *pmr;
1401 struct in6_addr addr_buf;
1402 int err;
1403 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1404 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1405 IPV6_TLV_PADN, 0 };
1406
1407 /* we assume size > sizeof(ra) here */
1408 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1409
1410 if (skb == 0)
1411 return NULL;
1412
1413 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1414
95c385b4 1415 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1416 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1417 * use unspecified address as the source address
1da177e4
LT		 1418 * when a valid link-local address is not available.
1419 */
1420 memset(&addr_buf, 0, sizeof(addr_buf));
1421 }
1422
1423 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1424
1425 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1426
27a884dc 1427 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1428 skb_put(skb, sizeof(*pmr));
1429 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1430 pmr->type = ICMPV6_MLD2_REPORT;
1431 pmr->resv1 = 0;
1432 pmr->csum = 0;
1433 pmr->resv2 = 0;
1434 pmr->ngrec = 0;
1435 return skb;
1436}
1437
e9823185
PM		 1438static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1439{
1440 struct net_device *dev = skb->dev;
1441
1442 if (dev->hard_header) {
1443 unsigned char ha[MAX_ADDR_LEN];
1444 int err;
1445
0660e03f 1446 ndisc_mc_map(&ipv6_hdr(skb)->daddr, ha, dev, 1);
e9823185
PM		 1447 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1448 if (err < 0) {
1449 kfree_skb(skb);
1450 return err;
1451 }
1452 }
1453 return dev_queue_xmit(skb);
1454}
1455
1456static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1457{
1458 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1ab1457c 1459 mld_dev_queue_xmit2);
e9823185
PM		 1460}
1461
1da177e4
LT		 1462static void mld_sendpack(struct sk_buff *skb)
1463{
0660e03f 1464 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1465 struct mld2_report *pmr =
1466 (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1467 int payload_len, mldlen;
1468 struct inet6_dev *idev = in6_dev_get(skb->dev);
1469 int err;
1470
a11d206d 1471 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
27a884dc
ACM		 1472 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1473 mldlen = skb->tail - skb->transport_header;
1da177e4
LT		 1474 pip6->payload_len = htons(payload_len);
1475
1476 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
9c70220b
ACM		 1477 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1478 mldlen, 0));
1da177e4 1479 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1480 mld_dev_queue_xmit);
1da177e4
LT		 1481 if (!err) {
1482 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
a11d206d 1483 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1da177e4 1484 } else
a11d206d 1485 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1486
1487 if (likely(idev != NULL))
1488 in6_dev_put(idev);
1489}
1490
1491static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1492{
fab10fe3 1493 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1494}
1495
1496static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1497 int type, struct mld2_grec **ppgr)
1498{
1499 struct net_device *dev = pmc->idev->dev;
1500 struct mld2_report *pmr;
1501 struct mld2_grec *pgr;
1502
1503 if (!skb)
1504 skb = mld_newpack(dev, dev->mtu);
1505 if (!skb)
1506 return NULL;
1507 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1508 pgr->grec_type = type;
1509 pgr->grec_auxwords = 0;
1510 pgr->grec_nsrcs = 0;
1511 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1512 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1513 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1514 *ppgr = pgr;
1515 return skb;
1516}
1517
1518#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1519 skb_tailroom(skb)) : 0)
1520
1521static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1522 int type, int gdeleted, int sdeleted)
1523{
1524 struct net_device *dev = pmc->idev->dev;
1525 struct mld2_report *pmr;
1526 struct mld2_grec *pgr = NULL;
1527 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1528 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1529
1530 if (pmc->mca_flags & MAF_NOREPORT)
1531 return skb;
1532
1533 isquery = type == MLD2_MODE_IS_INCLUDE ||
1534 type == MLD2_MODE_IS_EXCLUDE;
1535 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1536 type == MLD2_CHANGE_TO_EXCLUDE;
1537
5ab4a6c8
DS		 1538 stotal = scount = 0;
1539
1da177e4
LT		 1540 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1541
5ab4a6c8
DS		 1542 if (!*psf_list)
1543 goto empty_source;
1544
9c70220b 1545 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1546
1547 /* EX and TO_EX get a fresh packet, if needed */
1548 if (truncate) {
1549 if (pmr && pmr->ngrec &&
1550 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1551 if (skb)
1552 mld_sendpack(skb);
1553 skb = mld_newpack(dev, dev->mtu);
1554 }
1555 }
1556 first = 1;
1da177e4
LT		 1557 psf_prev = NULL;
1558 for (psf=*psf_list; psf; psf=psf_next) {
1559 struct in6_addr *psrc;
1560
1561 psf_next = psf->sf_next;
1562
1563 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1564 psf_prev = psf;
1565 continue;
1566 }
1567
1568 /* clear marks on query responses */
1569 if (isquery)
1570 psf->sf_gsresp = 0;
1571
1572 if (AVAILABLE(skb) < sizeof(*psrc) +
1573 first*sizeof(struct mld2_grec)) {
1574 if (truncate && !first)
1575 break; /* truncate these */
1576 if (pgr)
1577 pgr->grec_nsrcs = htons(scount);
1578 if (skb)
1579 mld_sendpack(skb);
1580 skb = mld_newpack(dev, dev->mtu);
1581 first = 1;
1582 scount = 0;
1583 }
1584 if (first) {
1585 skb = add_grhead(skb, pmc, type, &pgr);
1586 first = 0;
1587 }
cc63f70b
AD		 1588 if (!skb)
1589 return NULL;
1da177e4
LT		 1590 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1591 *psrc = psf->sf_addr;
5ab4a6c8 1592 scount++; stotal++;
1da177e4
LT		 1593 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1594 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1595 psf->sf_crcount--;
1596 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1597 if (psf_prev)
1598 psf_prev->sf_next = psf->sf_next;
1599 else
1600 *psf_list = psf->sf_next;
1601 kfree(psf);
1602 continue;
1603 }
1604 }
1605 psf_prev = psf;
1606 }
5ab4a6c8
DS		 1607
1608empty_source:
1609 if (!stotal) {
1610 if (type == MLD2_ALLOW_NEW_SOURCES ||
1611 type == MLD2_BLOCK_OLD_SOURCES)
1612 return skb;
1613 if (pmc->mca_crcount || isquery) {
1614 /* make sure we have room for group header */
1615 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1616 mld_sendpack(skb);
1617 skb = NULL; /* add_grhead will get a new one */
1618 }
1619 skb = add_grhead(skb, pmc, type, &pgr);
1620 }
1621 }
1da177e4
LT		 1622 if (pgr)
1623 pgr->grec_nsrcs = htons(scount);
1624
1625 if (isquery)
1626 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1627 return skb;
1628}
1629
1630static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1631{
1632 struct sk_buff *skb = NULL;
1633 int type;
1634
1635 if (!pmc) {
1636 read_lock_bh(&idev->lock);
1637 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1638 if (pmc->mca_flags & MAF_NOREPORT)
1639 continue;
1640 spin_lock_bh(&pmc->mca_lock);
1641 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1642 type = MLD2_MODE_IS_EXCLUDE;
1643 else
1644 type = MLD2_MODE_IS_INCLUDE;
1645 skb = add_grec(skb, pmc, type, 0, 0);
1646 spin_unlock_bh(&pmc->mca_lock);
1647 }
1648 read_unlock_bh(&idev->lock);
1649 } else {
1650 spin_lock_bh(&pmc->mca_lock);
1651 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1652 type = MLD2_MODE_IS_EXCLUDE;
1653 else
1654 type = MLD2_MODE_IS_INCLUDE;
1655 skb = add_grec(skb, pmc, type, 0, 0);
1656 spin_unlock_bh(&pmc->mca_lock);
1657 }
1658 if (skb)
1659 mld_sendpack(skb);
1660}
1661
1662/*
1663 * remove zero-count source records from a source filter list
1664 */
1665static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1666{
1667 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1668
1669 psf_prev = NULL;
1670 for (psf=*ppsf; psf; psf = psf_next) {
1671 psf_next = psf->sf_next;
1672 if (psf->sf_crcount == 0) {
1673 if (psf_prev)
1674 psf_prev->sf_next = psf->sf_next;
1675 else
1676 *ppsf = psf->sf_next;
1677 kfree(psf);
1678 } else
1679 psf_prev = psf;
1680 }
1681}
1682
1683static void mld_send_cr(struct inet6_dev *idev)
1684{
1685 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1686 struct sk_buff *skb = NULL;
1687 int type, dtype;
1688
1689 read_lock_bh(&idev->lock);
1690 write_lock_bh(&idev->mc_lock);
1691
1692 /* deleted MCA's */
1693 pmc_prev = NULL;
1694 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1695 pmc_next = pmc->next;
1696 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1697 type = MLD2_BLOCK_OLD_SOURCES;
1698 dtype = MLD2_BLOCK_OLD_SOURCES;
1699 skb = add_grec(skb, pmc, type, 1, 0);
1700 skb = add_grec(skb, pmc, dtype, 1, 1);
1701 }
1702 if (pmc->mca_crcount) {
1da177e4
LT		 1703 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1704 type = MLD2_CHANGE_TO_INCLUDE;
1705 skb = add_grec(skb, pmc, type, 1, 0);
1706 }
5ab4a6c8 1707 pmc->mca_crcount--;
1da177e4
LT		 1708 if (pmc->mca_crcount == 0) {
1709 mld_clear_zeros(&pmc->mca_tomb);
1710 mld_clear_zeros(&pmc->mca_sources);
1711 }
1712 }
1713 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1714 !pmc->mca_sources) {
1715 if (pmc_prev)
1716 pmc_prev->next = pmc_next;
1717 else
1718 idev->mc_tomb = pmc_next;
1719 in6_dev_put(pmc->idev);
1720 kfree(pmc);
1721 } else
1722 pmc_prev = pmc;
1723 }
1724 write_unlock_bh(&idev->mc_lock);
1725
1726 /* change recs */
1727 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1728 spin_lock_bh(&pmc->mca_lock);
1729 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1730 type = MLD2_BLOCK_OLD_SOURCES;
1731 dtype = MLD2_ALLOW_NEW_SOURCES;
1732 } else {
1733 type = MLD2_ALLOW_NEW_SOURCES;
1734 dtype = MLD2_BLOCK_OLD_SOURCES;
1735 }
1736 skb = add_grec(skb, pmc, type, 0, 0);
1737 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1738
1739 /* filter mode changes */
1740 if (pmc->mca_crcount) {
1da177e4
LT		 1741 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1742 type = MLD2_CHANGE_TO_EXCLUDE;
1743 else
1744 type = MLD2_CHANGE_TO_INCLUDE;
1745 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1746 pmc->mca_crcount--;
1da177e4
LT		 1747 }
1748 spin_unlock_bh(&pmc->mca_lock);
1749 }
1750 read_unlock_bh(&idev->lock);
1751 if (!skb)
1752 return;
1753 (void) mld_sendpack(skb);
1754}
1755
1756static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1757{
1758 struct sock *sk = igmp6_socket->sk;
1759 struct inet6_dev *idev;
1ab1457c
YH		 1760 struct sk_buff *skb;
1761 struct icmp6hdr *hdr;
1da177e4
LT		 1762 struct in6_addr *snd_addr;
1763 struct in6_addr *addrp;
1764 struct in6_addr addr_buf;
1765 struct in6_addr all_routers;
1766 int err, len, payload_len, full_len;
1767 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1768 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1769 IPV6_TLV_PADN, 0 };
1770
a11d206d
YH		 1771 rcu_read_lock();
1772 IP6_INC_STATS(__in6_dev_get(dev),
1773 IPSTATS_MIB_OUTREQUESTS);
1774 rcu_read_unlock();
1da177e4
LT		 1775 snd_addr = addr;
1776 if (type == ICMPV6_MGM_REDUCTION) {
1777 snd_addr = &all_routers;
1778 ipv6_addr_all_routers(&all_routers);
1779 }
1780
1781 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1782 payload_len = len + sizeof(ra);
1783 full_len = sizeof(struct ipv6hdr) + payload_len;
1784
1785 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1786
1787 if (skb == NULL) {
a11d206d
YH		 1788 rcu_read_lock();
1789 IP6_INC_STATS(__in6_dev_get(dev),
1790 IPSTATS_MIB_OUTDISCARDS);
1791 rcu_read_unlock();
1da177e4
LT		 1792 return;
1793 }
1794
1795 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1796
95c385b4 1797 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1798 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1799 * use unspecified address as the source address
1da177e4
LT		 1800 * when a valid link-local address is not available.
1801 */
1802 memset(&addr_buf, 0, sizeof(addr_buf));
1803 }
1804
1805 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1806
1807 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1808
1809 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1810 memset(hdr, 0, sizeof(struct icmp6hdr));
1811 hdr->icmp6_type = type;
1812
1813 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1814 ipv6_addr_copy(addrp, addr);
1815
1816 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1817 IPPROTO_ICMPV6,
1818 csum_partial((__u8 *) hdr, len, 0));
1819
1820 idev = in6_dev_get(skb->dev);
1821
1822 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1823 mld_dev_queue_xmit);
1da177e4
LT		 1824 if (!err) {
1825 if (type == ICMPV6_MGM_REDUCTION)
1826 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1827 else
1828 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1829 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
a11d206d 1830 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1da177e4 1831 } else
a11d206d 1832 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1833
1834 if (likely(idev != NULL))
1835 in6_dev_put(idev);
1836 return;
1da177e4
LT		 1837}
1838
1839static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1840 struct in6_addr *psfsrc)
1841{
1842 struct ip6_sf_list *psf, *psf_prev;
1843 int rv = 0;
1844
1845 psf_prev = NULL;
1846 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1847 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1848 break;
1849 psf_prev = psf;
1850 }
1851 if (!psf || psf->sf_count[sfmode] == 0) {
1852 /* source filter not found, or count wrong => bug */
1853 return -ESRCH;
1854 }
1855 psf->sf_count[sfmode]--;
1856 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1857 struct inet6_dev *idev = pmc->idev;
1858
1859 /* no more filters for this source */
1860 if (psf_prev)
1861 psf_prev->sf_next = psf->sf_next;
1862 else
1863 pmc->mca_sources = psf->sf_next;
1864 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1865 !MLD_V1_SEEN(idev)) {
1866 psf->sf_crcount = idev->mc_qrv;
1867 psf->sf_next = pmc->mca_tomb;
1868 pmc->mca_tomb = psf;
1869 rv = 1;
1870 } else
1871 kfree(psf);
1872 }
1873 return rv;
1874}
1875
1876static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1877 int sfmode, int sfcount, struct in6_addr *psfsrc,
1878 int delta)
1879{
1880 struct ifmcaddr6 *pmc;
1881 int changerec = 0;
1882 int i, err;
1883
1884 if (!idev)
1885 return -ENODEV;
1886 read_lock_bh(&idev->lock);
1887 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1888 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1889 break;
1890 }
1891 if (!pmc) {
1892 /* MCA not found?? bug */
1893 read_unlock_bh(&idev->lock);
1894 return -ESRCH;
1895 }
1896 spin_lock_bh(&pmc->mca_lock);
1897 sf_markstate(pmc);
1898 if (!delta) {
1899 if (!pmc->mca_sfcount[sfmode]) {
1900 spin_unlock_bh(&pmc->mca_lock);
1901 read_unlock_bh(&idev->lock);
1902 return -EINVAL;
1903 }
1904 pmc->mca_sfcount[sfmode]--;
1905 }
1906 err = 0;
1907 for (i=0; i<sfcount; i++) {
1908 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1909
1910 changerec |= rv > 0;
1911 if (!err && rv < 0)
1912 err = rv;
1913 }
1914 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1915 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1916 pmc->mca_sfcount[MCAST_INCLUDE]) {
1917 struct ip6_sf_list *psf;
1918
1919 /* filter mode change */
1920 pmc->mca_sfmode = MCAST_INCLUDE;
1921 pmc->mca_crcount = idev->mc_qrv;
1922 idev->mc_ifc_count = pmc->mca_crcount;
1923 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1924 psf->sf_crcount = 0;
1925 mld_ifc_event(pmc->idev);
1926 } else if (sf_setstate(pmc) || changerec)
1927 mld_ifc_event(pmc->idev);
1928 spin_unlock_bh(&pmc->mca_lock);
1929 read_unlock_bh(&idev->lock);
1930 return err;
1931}
1932
1933/*
1934 * Add multicast single-source filter to the interface list
1935 */
1936static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1937 struct in6_addr *psfsrc, int delta)
1938{
1939 struct ip6_sf_list *psf, *psf_prev;
1940
1941 psf_prev = NULL;
1942 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1943 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1944 break;
1945 psf_prev = psf;
1946 }
1947 if (!psf) {
0c600eda 1948 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1949 if (!psf)
1950 return -ENOBUFS;
0c600eda 1951
1da177e4
LT		 1952 psf->sf_addr = *psfsrc;
1953 if (psf_prev) {
1954 psf_prev->sf_next = psf;
1955 } else
1956 pmc->mca_sources = psf;
1957 }
1958 psf->sf_count[sfmode]++;
1959 return 0;
1960}
1961
1962static void sf_markstate(struct ifmcaddr6 *pmc)
1963{
1964 struct ip6_sf_list *psf;
1965 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1966
1967 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1968 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1969 psf->sf_oldin = mca_xcount ==
1970 psf->sf_count[MCAST_EXCLUDE] &&
1971 !psf->sf_count[MCAST_INCLUDE];
1972 } else
1973 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1974}
1975
1976static int sf_setstate(struct ifmcaddr6 *pmc)
1977{
7add2a43 1978 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 1979 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1980 int qrv = pmc->idev->mc_qrv;
1981 int new_in, rv;
1982
1983 rv = 0;
1984 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1985 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1986 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1987 !psf->sf_count[MCAST_INCLUDE];
1988 } else
1989 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 1990 if (new_in) {
1991 if (!psf->sf_oldin) {
e80e28b6 1992 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 1993
1994 for (dpsf=pmc->mca_tomb; dpsf;
1995 dpsf=dpsf->sf_next) {
1996 if (ipv6_addr_equal(&dpsf->sf_addr,
1997 &psf->sf_addr))
1998 break;
1999 prev = dpsf;
2000 }
2001 if (dpsf) {
2002 if (prev)
2003 prev->sf_next = dpsf->sf_next;
2004 else
2005 pmc->mca_tomb = dpsf->sf_next;
2006 kfree(dpsf);
2007 }
2008 psf->sf_crcount = qrv;
2009 rv++;
2010 }
2011 } else if (psf->sf_oldin) {
2012 psf->sf_crcount = 0;
2013 /*
2014 * add or update "delete" records if an active filter
2015 * is now inactive
2016 */
2017 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2018 if (ipv6_addr_equal(&dpsf->sf_addr,
2019 &psf->sf_addr))
2020 break;
2021 if (!dpsf) {
2022 dpsf = (struct ip6_sf_list *)
2023 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2024 if (!dpsf)
2025 continue;
2026 *dpsf = *psf;
2027 /* pmc->mca_lock held by callers */
2028 dpsf->sf_next = pmc->mca_tomb;
2029 pmc->mca_tomb = dpsf;
2030 }
2031 dpsf->sf_crcount = qrv;
1da177e4
LT		 2032 rv++;
2033 }
2034 }
2035 return rv;
2036}
2037
2038/*
2039 * Add multicast source filter list to the interface list
2040 */
2041static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2042 int sfmode, int sfcount, struct in6_addr *psfsrc,
2043 int delta)
2044{
2045 struct ifmcaddr6 *pmc;
2046 int isexclude;
2047 int i, err;
2048
2049 if (!idev)
2050 return -ENODEV;
2051 read_lock_bh(&idev->lock);
2052 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2053 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2054 break;
2055 }
2056 if (!pmc) {
2057 /* MCA not found?? bug */
2058 read_unlock_bh(&idev->lock);
2059 return -ESRCH;
2060 }
2061 spin_lock_bh(&pmc->mca_lock);
2062
2063 sf_markstate(pmc);
2064 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2065 if (!delta)
2066 pmc->mca_sfcount[sfmode]++;
2067 err = 0;
2068 for (i=0; i<sfcount; i++) {
2069 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2070 if (err)
2071 break;
2072 }
2073 if (err) {
2074 int j;
2075
2076 if (!delta)
2077 pmc->mca_sfcount[sfmode]--;
2078 for (j=0; j<i; j++)
2079 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2080 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2081 struct inet6_dev *idev = pmc->idev;
2082 struct ip6_sf_list *psf;
2083
2084 /* filter mode change */
2085 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2086 pmc->mca_sfmode = MCAST_EXCLUDE;
2087 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2088 pmc->mca_sfmode = MCAST_INCLUDE;
2089 /* else no filters; keep old mode for reports */
2090
2091 pmc->mca_crcount = idev->mc_qrv;
2092 idev->mc_ifc_count = pmc->mca_crcount;
2093 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2094 psf->sf_crcount = 0;
2095 mld_ifc_event(idev);
2096 } else if (sf_setstate(pmc))
2097 mld_ifc_event(idev);
2098 spin_unlock_bh(&pmc->mca_lock);
2099 read_unlock_bh(&idev->lock);
2100 return err;
2101}
2102
2103static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2104{
2105 struct ip6_sf_list *psf, *nextpsf;
2106
2107 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2108 nextpsf = psf->sf_next;
2109 kfree(psf);
2110 }
2111 pmc->mca_tomb = NULL;
2112 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2113 nextpsf = psf->sf_next;
2114 kfree(psf);
2115 }
2116 pmc->mca_sources = NULL;
2117 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2118 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2119 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2120}
2121
2122
2123static void igmp6_join_group(struct ifmcaddr6 *ma)
2124{
2125 unsigned long delay;
2126
2127 if (ma->mca_flags & MAF_NOREPORT)
2128 return;
2129
2130 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2131
2132 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2133
2134 spin_lock_bh(&ma->mca_lock);
2135 if (del_timer(&ma->mca_timer)) {
2136 atomic_dec(&ma->mca_refcnt);
2137 delay = ma->mca_timer.expires - jiffies;
2138 }
2139
2140 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2141 atomic_inc(&ma->mca_refcnt);
2142 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2143 spin_unlock_bh(&ma->mca_lock);
2144}
2145
2146static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2147 struct inet6_dev *idev)
2148{
2149 int err;
2150
5ab4a6c8
DS		 2151 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2152 * so no other readers or writers of iml or its sflist
2153 */
1da177e4
LT		 2154 if (iml->sflist == 0) {
2155 /* any-source empty exclude case */
2156 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2157 }
2158 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2159 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2160 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2161 iml->sflist = NULL;
2162 return err;
2163}
2164
2165static void igmp6_leave_group(struct ifmcaddr6 *ma)
2166{
2167 if (MLD_V1_SEEN(ma->idev)) {
2168 if (ma->mca_flags & MAF_LAST_REPORTER)
2169 igmp6_send(&ma->mca_addr, ma->idev->dev,
2170 ICMPV6_MGM_REDUCTION);
2171 } else {
2172 mld_add_delrec(ma->idev, ma);
2173 mld_ifc_event(ma->idev);
2174 }
2175}
2176
2177static void mld_gq_timer_expire(unsigned long data)
2178{
2179 struct inet6_dev *idev = (struct inet6_dev *)data;
2180
2181 idev->mc_gq_running = 0;
2182 mld_send_report(idev, NULL);
2183 __in6_dev_put(idev);
2184}
2185
2186static void mld_ifc_timer_expire(unsigned long data)
2187{
2188 struct inet6_dev *idev = (struct inet6_dev *)data;
2189
2190 mld_send_cr(idev);
2191 if (idev->mc_ifc_count) {
2192 idev->mc_ifc_count--;
2193 if (idev->mc_ifc_count)
2194 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2195 }
2196 __in6_dev_put(idev);
2197}
2198
2199static void mld_ifc_event(struct inet6_dev *idev)
2200{
2201 if (MLD_V1_SEEN(idev))
2202 return;
2203 idev->mc_ifc_count = idev->mc_qrv;
2204 mld_ifc_start_timer(idev, 1);
2205}
2206
2207
2208static void igmp6_timer_handler(unsigned long data)
2209{
2210 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2211
2212 if (MLD_V1_SEEN(ma->idev))
2213 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2214 else
2215 mld_send_report(ma->idev, ma);
2216
2217 spin_lock(&ma->mca_lock);
2218 ma->mca_flags |= MAF_LAST_REPORTER;
2219 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2220 spin_unlock(&ma->mca_lock);
2221 ma_put(ma);
2222}
2223
2224/* Device going down */
2225
2226void ipv6_mc_down(struct inet6_dev *idev)
2227{
2228 struct ifmcaddr6 *i;
2229
2230 /* Withdraw multicast list */
2231
2232 read_lock_bh(&idev->lock);
2233 idev->mc_ifc_count = 0;
2234 if (del_timer(&idev->mc_ifc_timer))
2235 __in6_dev_put(idev);
2236 idev->mc_gq_running = 0;
2237 if (del_timer(&idev->mc_gq_timer))
2238 __in6_dev_put(idev);
2239
2240 for (i = idev->mc_list; i; i=i->next)
2241 igmp6_group_dropped(i);
2242 read_unlock_bh(&idev->lock);
2243
2244 mld_clear_delrec(idev);
2245}
2246
2247
2248/* Device going up */
2249
2250void ipv6_mc_up(struct inet6_dev *idev)
2251{
2252 struct ifmcaddr6 *i;
2253
2254 /* Install multicast list, except for all-nodes (already installed) */
2255
2256 read_lock_bh(&idev->lock);
2257 for (i = idev->mc_list; i; i=i->next)
2258 igmp6_group_added(i);
2259 read_unlock_bh(&idev->lock);
2260}
2261
2262/* IPv6 device initialization. */
2263
2264void ipv6_mc_init_dev(struct inet6_dev *idev)
2265{
1da177e4
LT		 2266 write_lock_bh(&idev->lock);
2267 rwlock_init(&idev->mc_lock);
2268 idev->mc_gq_running = 0;
2269 init_timer(&idev->mc_gq_timer);
2270 idev->mc_gq_timer.data = (unsigned long) idev;
2271 idev->mc_gq_timer.function = &mld_gq_timer_expire;
2272 idev->mc_tomb = NULL;
2273 idev->mc_ifc_count = 0;
2274 init_timer(&idev->mc_ifc_timer);
2275 idev->mc_ifc_timer.data = (unsigned long) idev;
2276 idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2277 idev->mc_qrv = MLD_QRV_DEFAULT;
2278 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2279 idev->mc_v1_seen = 0;
2280 write_unlock_bh(&idev->lock);
1da177e4
LT		 2281}
2282
2283/*
2284 * Device is about to be destroyed: clean up.
2285 */
2286
2287void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2288{
2289 struct ifmcaddr6 *i;
2290 struct in6_addr maddr;
2291
2292 /* Deactivate timers */
2293 ipv6_mc_down(idev);
2294
2295 /* Delete all-nodes address. */
2296 ipv6_addr_all_nodes(&maddr);
2297
2298 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2299 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2300 * fail.
2301 */
2302 __ipv6_dev_mc_dec(idev, &maddr);
2303
2304 if (idev->cnf.forwarding) {
2305 ipv6_addr_all_routers(&maddr);
2306 __ipv6_dev_mc_dec(idev, &maddr);
2307 }
2308
2309 write_lock_bh(&idev->lock);
2310 while ((i = idev->mc_list) != NULL) {
2311 idev->mc_list = i->next;
2312 write_unlock_bh(&idev->lock);
2313
2314 igmp6_group_dropped(i);
2315 ma_put(i);
2316
2317 write_lock_bh(&idev->lock);
2318 }
2319 write_unlock_bh(&idev->lock);
2320}
2321
2322#ifdef CONFIG_PROC_FS
2323struct igmp6_mc_iter_state {
2324 struct net_device *dev;
2325 struct inet6_dev *idev;
2326};
2327
2328#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2329
2330static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2331{
2332 struct ifmcaddr6 *im = NULL;
2333 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2334
7562f876
PE		 2335 state->idev = NULL;
2336 for_each_netdev(state->dev) {
1da177e4
LT		 2337 struct inet6_dev *idev;
2338 idev = in6_dev_get(state->dev);
2339 if (!idev)
2340 continue;
2341 read_lock_bh(&idev->lock);
2342 im = idev->mc_list;
2343 if (im) {
2344 state->idev = idev;
2345 break;
2346 }
2347 read_unlock_bh(&idev->lock);
2348 in6_dev_put(idev);
2349 }
2350 return im;
2351}
2352
2353static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2354{
2355 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2356
2357 im = im->next;
2358 while (!im) {
2359 if (likely(state->idev != NULL)) {
2360 read_unlock_bh(&state->idev->lock);
2361 in6_dev_put(state->idev);
2362 }
7562f876 2363 state->dev = next_net_device(state->dev);
1da177e4
LT		 2364 if (!state->dev) {
2365 state->idev = NULL;
2366 break;
2367 }
2368 state->idev = in6_dev_get(state->dev);
2369 if (!state->idev)
2370 continue;
2371 read_lock_bh(&state->idev->lock);
2372 im = state->idev->mc_list;
2373 }
2374 return im;
2375}
2376
2377static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2378{
2379 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2380 if (im)
2381 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2382 --pos;
2383 return pos ? NULL : im;
2384}
2385
2386static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2387{
2388 read_lock(&dev_base_lock);
2389 return igmp6_mc_get_idx(seq, *pos);
2390}
2391
2392static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2393{
2394 struct ifmcaddr6 *im;
2395 im = igmp6_mc_get_next(seq, v);
2396 ++*pos;
2397 return im;
2398}
2399
2400static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2401{
2402 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2403 if (likely(state->idev != NULL)) {
2404 read_unlock_bh(&state->idev->lock);
2405 in6_dev_put(state->idev);
2406 state->idev = NULL;
2407 }
2408 state->dev = NULL;
2409 read_unlock(&dev_base_lock);
2410}
2411
2412static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2413{
2414 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2415 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2416
2417 seq_printf(seq,
1ab1457c 2418 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
1da177e4
LT		 2419 state->dev->ifindex, state->dev->name,
2420 NIP6(im->mca_addr),
2421 im->mca_users, im->mca_flags,
2422 (im->mca_flags&MAF_TIMER_RUNNING) ?
2423 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2424 return 0;
2425}
2426
56b3d975 2427static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2428 .start = igmp6_mc_seq_start,
2429 .next = igmp6_mc_seq_next,
2430 .stop = igmp6_mc_seq_stop,
2431 .show = igmp6_mc_seq_show,
2432};
2433
2434static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2435{
2436 struct seq_file *seq;
2437 int rc = -ENOMEM;
0c600eda 2438 struct igmp6_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2439
2440 if (!s)
2441 goto out;
2442
2443 rc = seq_open(file, &igmp6_mc_seq_ops);
2444 if (rc)
2445 goto out_kfree;
2446
2447 seq = file->private_data;
2448 seq->private = s;
1da177e4
LT		 2449out:
2450 return rc;
2451out_kfree:
2452 kfree(s);
2453 goto out;
2454}
2455
9a32144e 2456static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2457 .owner = THIS_MODULE,
2458 .open = igmp6_mc_seq_open,
2459 .read = seq_read,
2460 .llseek = seq_lseek,
2461 .release = seq_release_private,
2462};
2463
2464struct igmp6_mcf_iter_state {
2465 struct net_device *dev;
2466 struct inet6_dev *idev;
2467 struct ifmcaddr6 *im;
2468};
2469
2470#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2471
2472static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2473{
2474 struct ip6_sf_list *psf = NULL;
2475 struct ifmcaddr6 *im = NULL;
2476 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2477
7562f876
PE		 2478 state->idev = NULL;
2479 state->im = NULL;
2480 for_each_netdev(state->dev) {
1da177e4
LT		 2481 struct inet6_dev *idev;
2482 idev = in6_dev_get(state->dev);
2483 if (unlikely(idev == NULL))
2484 continue;
2485 read_lock_bh(&idev->lock);
2486 im = idev->mc_list;
2487 if (likely(im != NULL)) {
2488 spin_lock_bh(&im->mca_lock);
2489 psf = im->mca_sources;
2490 if (likely(psf != NULL)) {
2491 state->im = im;
2492 state->idev = idev;
2493 break;
2494 }
2495 spin_unlock_bh(&im->mca_lock);
2496 }
2497 read_unlock_bh(&idev->lock);
2498 in6_dev_put(idev);
2499 }
2500 return psf;
2501}
2502
2503static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2504{
2505 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2506
2507 psf = psf->sf_next;
2508 while (!psf) {
2509 spin_unlock_bh(&state->im->mca_lock);
2510 state->im = state->im->next;
2511 while (!state->im) {
2512 if (likely(state->idev != NULL)) {
2513 read_unlock_bh(&state->idev->lock);
2514 in6_dev_put(state->idev);
2515 }
7562f876 2516 state->dev = next_net_device(state->dev);
1da177e4
LT		 2517 if (!state->dev) {
2518 state->idev = NULL;
2519 goto out;
2520 }
2521 state->idev = in6_dev_get(state->dev);
2522 if (!state->idev)
2523 continue;
2524 read_lock_bh(&state->idev->lock);
2525 state->im = state->idev->mc_list;
2526 }
2527 if (!state->im)
2528 break;
2529 spin_lock_bh(&state->im->mca_lock);
2530 psf = state->im->mca_sources;
2531 }
2532out:
2533 return psf;
2534}
2535
2536static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2537{
2538 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2539 if (psf)
2540 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2541 --pos;
2542 return pos ? NULL : psf;
2543}
2544
2545static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2546{
2547 read_lock(&dev_base_lock);
2548 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2549}
2550
2551static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2552{
2553 struct ip6_sf_list *psf;
2554 if (v == SEQ_START_TOKEN)
2555 psf = igmp6_mcf_get_first(seq);
2556 else
2557 psf = igmp6_mcf_get_next(seq, v);
2558 ++*pos;
2559 return psf;
2560}
2561
2562static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2563{
2564 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2565 if (likely(state->im != NULL)) {
2566 spin_unlock_bh(&state->im->mca_lock);
2567 state->im = NULL;
2568 }
2569 if (likely(state->idev != NULL)) {
2570 read_unlock_bh(&state->idev->lock);
2571 in6_dev_put(state->idev);
2572 state->idev = NULL;
2573 }
2574 state->dev = NULL;
2575 read_unlock(&dev_base_lock);
2576}
2577
2578static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2579{
2580 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2581 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2582
2583 if (v == SEQ_START_TOKEN) {
1ab1457c 2584 seq_printf(seq,
1da177e4 2585 "%3s %6s "
9343e79a 2586 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2587 "Device", "Multicast Address",
2588 "Source Address", "INC", "EXC");
2589 } else {
2590 seq_printf(seq,
9343e79a 2591 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
1da177e4
LT		 2592 state->dev->ifindex, state->dev->name,
2593 NIP6(state->im->mca_addr),
2594 NIP6(psf->sf_addr),
2595 psf->sf_count[MCAST_INCLUDE],
2596 psf->sf_count[MCAST_EXCLUDE]);
2597 }
2598 return 0;
2599}
2600
56b3d975 2601static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2602 .start = igmp6_mcf_seq_start,
2603 .next = igmp6_mcf_seq_next,
2604 .stop = igmp6_mcf_seq_stop,
2605 .show = igmp6_mcf_seq_show,
2606};
2607
2608static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2609{
2610 struct seq_file *seq;
2611 int rc = -ENOMEM;
0c600eda 2612 struct igmp6_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1ab1457c 2613
1da177e4
LT		 2614 if (!s)
2615 goto out;
2616
2617 rc = seq_open(file, &igmp6_mcf_seq_ops);
2618 if (rc)
2619 goto out_kfree;
2620
2621 seq = file->private_data;
2622 seq->private = s;
1da177e4
LT		 2623out:
2624 return rc;
2625out_kfree:
2626 kfree(s);
2627 goto out;
2628}
2629
9a32144e 2630static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2631 .owner = THIS_MODULE,
2632 .open = igmp6_mcf_seq_open,
2633 .read = seq_read,
2634 .llseek = seq_lseek,
2635 .release = seq_release_private,
2636};
2637#endif
2638
2639int __init igmp6_init(struct net_proto_family *ops)
2640{
2641 struct ipv6_pinfo *np;
2642 struct sock *sk;
2643 int err;
2644
2645 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2646 if (err < 0) {
2647 printk(KERN_ERR
2648 "Failed to initialize the IGMP6 control socket (err %d).\n",
2649 err);
2650 igmp6_socket = NULL; /* For safety. */
2651 return err;
2652 }
2653
2654 sk = igmp6_socket->sk;
2655 sk->sk_allocation = GFP_ATOMIC;
2656 sk->sk_prot->unhash(sk);
2657
2658 np = inet6_sk(sk);
2659 np->hop_limit = 1;
2660
2661#ifdef CONFIG_PROC_FS
457c4cbc
EB		 2662 proc_net_fops_create(&init_net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2663 proc_net_fops_create(&init_net, "mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
1da177e4
LT		 2664#endif
2665
2666 return 0;
2667}
2668
2669void igmp6_cleanup(void)
2670{
2671 sock_release(igmp6_socket);
2672 igmp6_socket = NULL; /* for safety */
2673
2674#ifdef CONFIG_PROC_FS
457c4cbc
EB		 2675 proc_net_remove(&init_net, "mcfilter6");
2676 proc_net_remove(&init_net, "igmp6");
1da177e4
LT		 2677#endif
2678}
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