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1da177e4
LT		 1/*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
9 *
10 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
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
31#include <linux/config.h>
32#include <linux/module.h>
33#include <linux/errno.h>
34#include <linux/types.h>
35#include <linux/string.h>
36#include <linux/socket.h>
37#include <linux/sockios.h>
38#include <linux/jiffies.h>
39#include <linux/times.h>
40#include <linux/net.h>
41#include <linux/in.h>
42#include <linux/in6.h>
43#include <linux/netdevice.h>
44#include <linux/if_arp.h>
45#include <linux/route.h>
46#include <linux/init.h>
47#include <linux/proc_fs.h>
48#include <linux/seq_file.h>
49
50#include <linux/netfilter.h>
51#include <linux/netfilter_ipv6.h>
52
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;
87 __u16 grec_nsrcs;
88 struct in6_addr grec_mca;
89 struct in6_addr grec_src[0];
90};
91
92struct mld2_report {
93 __u8 type;
94 __u8 resv1;
95 __u16 csum;
96 __u16 resv2;
97 __u16 ngrec;
98 struct mld2_grec grec[0];
99};
100
101struct mld2_query {
102 __u8 type;
103 __u8 code;
104 __u16 csum;
105 __u16 mrc;
106 __u16 resv1;
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;
120 __u16 nsrcs;
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
LT		 174
175int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF;
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
272 if (idev) {
273 (void) ip6_mc_leave_src(sk,mc_lst,idev);
274 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
275 in6_dev_put(idev);
276 }
277 dev_put(dev);
278 }
279 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
280 return 0;
281 }
282 }
283 write_unlock_bh(&ipv6_sk_mc_lock);
284
9951f036 285 return -EADDRNOTAVAIL;
1da177e4
LT		 286}
287
288static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
289{
290 struct net_device *dev = NULL;
291 struct inet6_dev *idev = NULL;
292
293 if (ifindex == 0) {
294 struct rt6_info *rt;
295
296 rt = rt6_lookup(group, NULL, 0, 0);
297 if (rt) {
298 dev = rt->rt6i_dev;
299 dev_hold(dev);
300 dst_release(&rt->u.dst);
301 }
302 } else
303 dev = dev_get_by_index(ifindex);
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;
326
327 write_lock_bh(&ipv6_sk_mc_lock);
328 while ((mc_lst = np->ipv6_mc_list) != NULL) {
329 struct net_device *dev;
330
331 np->ipv6_mc_list = mc_lst->next;
332 write_unlock_bh(&ipv6_sk_mc_lock);
333
334 dev = dev_get_by_index(mc_lst->ifindex);
335 if (dev) {
336 struct inet6_dev *idev = in6_dev_get(dev);
337
338 if (idev) {
339 (void) ip6_mc_leave_src(sk, mc_lst, idev);
340 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
341 in6_dev_put(idev);
342 }
343 dev_put(dev);
344 }
345
346 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
347
348 write_lock_bh(&ipv6_sk_mc_lock);
349 }
350 write_unlock_bh(&ipv6_sk_mc_lock);
351}
352
353int ip6_mc_source(int add, int omode, struct sock *sk,
354 struct group_source_req *pgsr)
355{
356 struct in6_addr *source, *group;
357 struct ipv6_mc_socklist *pmc;
358 struct net_device *dev;
359 struct inet6_dev *idev;
360 struct ipv6_pinfo *inet6 = inet6_sk(sk);
361 struct ip6_sf_socklist *psl;
362 int i, j, rv;
c9e3e8b6 363 int leavegroup = 0;
5ab4a6c8 364 int pmclocked = 0;
1da177e4
LT		 365 int err;
366
367 if (pgsr->gsr_group.ss_family != AF_INET6 ||
368 pgsr->gsr_source.ss_family != AF_INET6)
369 return -EINVAL;
370
371 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
372 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
373
374 if (!ipv6_addr_is_multicast(group))
375 return -EINVAL;
376
377 idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
378 if (!idev)
379 return -ENODEV;
380 dev = idev->dev;
381
382 err = -EADDRNOTAVAIL;
383
c9e3e8b6 384 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 385 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
386 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
387 continue;
388 if (ipv6_addr_equal(&pmc->addr, group))
389 break;
390 }
917f2f10
DS		 391 if (!pmc) { /* must have a prior join */
392 err = -EINVAL;
1da177e4 393 goto done;
917f2f10 394 }
1da177e4
LT		 395 /* if a source filter was set, must be the same mode as before */
396 if (pmc->sflist) {
917f2f10
DS		 397 if (pmc->sfmode != omode) {
398 err = -EINVAL;
1da177e4 399 goto done;
917f2f10 400 }
1da177e4
LT		 401 } else if (pmc->sfmode != omode) {
402 /* allow mode switches for empty-set filters */
403 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
404 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
405 pmc->sfmode = omode;
406 }
407
5ab4a6c8
DS		 408 write_lock_bh(&pmc->sflock);
409 pmclocked = 1;
410
1da177e4
LT		 411 psl = pmc->sflist;
412 if (!add) {
413 if (!psl)
917f2f10 414 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 415 rv = !0;
416 for (i=0; i<psl->sl_count; i++) {
417 rv = memcmp(&psl->sl_addr[i], source,
418 sizeof(struct in6_addr));
419 if (rv == 0)
420 break;
421 }
422 if (rv) /* source not found */
917f2f10 423 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 424
c9e3e8b6
DS		 425 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
426 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
427 leavegroup = 1;
428 goto done;
429 }
430
1da177e4
LT		 431 /* update the interface filter */
432 ip6_mc_del_src(idev, group, omode, 1, source, 1);
433
434 for (j=i+1; j<psl->sl_count; j++)
435 psl->sl_addr[j-1] = psl->sl_addr[j];
436 psl->sl_count--;
437 err = 0;
438 goto done;
439 }
440 /* else, add a new source to the filter */
441
442 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
443 err = -ENOBUFS;
444 goto done;
445 }
446 if (!psl || psl->sl_count == psl->sl_max) {
447 struct ip6_sf_socklist *newpsl;
448 int count = IP6_SFBLOCK;
449
450 if (psl)
451 count += psl->sl_max;
8b3a7005 452 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 453 if (!newpsl) {
454 err = -ENOBUFS;
455 goto done;
456 }
457 newpsl->sl_max = count;
458 newpsl->sl_count = count - IP6_SFBLOCK;
459 if (psl) {
460 for (i=0; i<psl->sl_count; i++)
461 newpsl->sl_addr[i] = psl->sl_addr[i];
462 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
463 }
464 pmc->sflist = psl = newpsl;
465 }
466 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
467 for (i=0; i<psl->sl_count; i++) {
468 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
469 if (rv == 0)
470 break;
471 }
472 if (rv == 0) /* address already there is an error */
473 goto done;
474 for (j=psl->sl_count-1; j>=i; j--)
475 psl->sl_addr[j+1] = psl->sl_addr[j];
476 psl->sl_addr[i] = *source;
477 psl->sl_count++;
478 err = 0;
479 /* update the interface list */
480 ip6_mc_add_src(idev, group, omode, 1, source, 1);
481done:
5ab4a6c8
DS		 482 if (pmclocked)
483 write_unlock_bh(&pmc->sflock);
c9e3e8b6 484 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 485 read_unlock_bh(&idev->lock);
486 in6_dev_put(idev);
487 dev_put(dev);
c9e3e8b6
DS		 488 if (leavegroup)
489 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 490 return err;
491}
492
493int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
494{
495 struct in6_addr *group;
496 struct ipv6_mc_socklist *pmc;
497 struct net_device *dev;
498 struct inet6_dev *idev;
499 struct ipv6_pinfo *inet6 = inet6_sk(sk);
500 struct ip6_sf_socklist *newpsl, *psl;
9951f036 501 int leavegroup = 0;
1da177e4
LT		 502 int i, err;
503
504 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
505
506 if (!ipv6_addr_is_multicast(group))
507 return -EINVAL;
508 if (gsf->gf_fmode != MCAST_INCLUDE &&
509 gsf->gf_fmode != MCAST_EXCLUDE)
510 return -EINVAL;
511
512 idev = ip6_mc_find_dev(group, gsf->gf_interface);
513
514 if (!idev)
515 return -ENODEV;
516 dev = idev->dev;
1da177e4 517
9c05989b 518 err = 0;
5ab4a6c8
DS		 519 read_lock_bh(&ipv6_sk_mc_lock);
520
9951f036
DS		 521 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
522 leavegroup = 1;
523 goto done;
524 }
525
1da177e4
LT		 526 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
527 if (pmc->ifindex != gsf->gf_interface)
528 continue;
529 if (ipv6_addr_equal(&pmc->addr, group))
530 break;
531 }
917f2f10
DS		 532 if (!pmc) { /* must have a prior join */
533 err = -EINVAL;
1da177e4 534 goto done;
917f2f10 535 }
1da177e4 536 if (gsf->gf_numsrc) {
8b3a7005
KK		 537 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
538 GFP_ATOMIC);
1da177e4
LT		 539 if (!newpsl) {
540 err = -ENOBUFS;
541 goto done;
542 }
543 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
544 for (i=0; i<newpsl->sl_count; ++i) {
545 struct sockaddr_in6 *psin6;
546
547 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
548 newpsl->sl_addr[i] = psin6->sin6_addr;
549 }
550 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
551 newpsl->sl_count, newpsl->sl_addr, 0);
552 if (err) {
553 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
554 goto done;
555 }
8713dbf0 556 } else {
1da177e4 557 newpsl = NULL;
8713dbf0
YZ		 558 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
559 }
5ab4a6c8
DS		 560
561 write_lock_bh(&pmc->sflock);
1da177e4
LT		 562 psl = pmc->sflist;
563 if (psl) {
564 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
565 psl->sl_count, psl->sl_addr, 0);
566 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
567 } else
568 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
569 pmc->sflist = newpsl;
570 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 571 write_unlock_bh(&pmc->sflock);
917f2f10 572 err = 0;
1da177e4 573done:
5ab4a6c8 574 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 575 read_unlock_bh(&idev->lock);
576 in6_dev_put(idev);
577 dev_put(dev);
9951f036
DS		 578 if (leavegroup)
579 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 580 return err;
581}
582
583int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
584 struct group_filter __user *optval, int __user *optlen)
585{
586 int err, i, count, copycount;
587 struct in6_addr *group;
588 struct ipv6_mc_socklist *pmc;
589 struct inet6_dev *idev;
590 struct net_device *dev;
591 struct ipv6_pinfo *inet6 = inet6_sk(sk);
592 struct ip6_sf_socklist *psl;
593
594 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
595
596 if (!ipv6_addr_is_multicast(group))
597 return -EINVAL;
598
599 idev = ip6_mc_find_dev(group, gsf->gf_interface);
600
601 if (!idev)
602 return -ENODEV;
603
604 dev = idev->dev;
605
606 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 607 /*
608 * changes to the ipv6_mc_list require the socket lock and
609 * a read lock on ip6_sk_mc_lock. We have the socket lock,
610 * so reading the list is safe.
611 */
1da177e4
LT		 612
613 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
614 if (pmc->ifindex != gsf->gf_interface)
615 continue;
616 if (ipv6_addr_equal(group, &pmc->addr))
617 break;
618 }
619 if (!pmc) /* must have a prior join */
620 goto done;
621 gsf->gf_fmode = pmc->sfmode;
622 psl = pmc->sflist;
623 count = psl ? psl->sl_count : 0;
624 read_unlock_bh(&idev->lock);
625 in6_dev_put(idev);
626 dev_put(dev);
627
628 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
629 gsf->gf_numsrc = count;
630 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
631 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
632 return -EFAULT;
633 }
5ab4a6c8
DS		 634 /* changes to psl require the socket lock, a read lock on
635 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
636 * have the socket lock, so reading here is safe.
637 */
1da177e4
LT		 638 for (i=0; i<copycount; i++) {
639 struct sockaddr_in6 *psin6;
640 struct sockaddr_storage ss;
641
642 psin6 = (struct sockaddr_in6 *)&ss;
643 memset(&ss, 0, sizeof(ss));
644 psin6->sin6_family = AF_INET6;
645 psin6->sin6_addr = psl->sl_addr[i];
646 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
647 return -EFAULT;
648 }
649 return 0;
650done:
651 read_unlock_bh(&idev->lock);
652 in6_dev_put(idev);
653 dev_put(dev);
654 return err;
655}
656
657int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
658 struct in6_addr *src_addr)
659{
660 struct ipv6_pinfo *np = inet6_sk(sk);
661 struct ipv6_mc_socklist *mc;
662 struct ip6_sf_socklist *psl;
663 int rv = 1;
664
665 read_lock(&ipv6_sk_mc_lock);
666 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
667 if (ipv6_addr_equal(&mc->addr, mc_addr))
668 break;
669 }
670 if (!mc) {
671 read_unlock(&ipv6_sk_mc_lock);
672 return 1;
673 }
5ab4a6c8 674 read_lock(&mc->sflock);
1da177e4
LT		 675 psl = mc->sflist;
676 if (!psl) {
677 rv = mc->sfmode == MCAST_EXCLUDE;
678 } else {
679 int i;
680
681 for (i=0; i<psl->sl_count; i++) {
682 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
683 break;
684 }
685 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
686 rv = 0;
687 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
688 rv = 0;
689 }
5ab4a6c8 690 read_unlock(&mc->sflock);
1da177e4
LT		 691 read_unlock(&ipv6_sk_mc_lock);
692
693 return rv;
694}
695
696static void ma_put(struct ifmcaddr6 *mc)
697{
698 if (atomic_dec_and_test(&mc->mca_refcnt)) {
699 in6_dev_put(mc->idev);
700 kfree(mc);
701 }
702}
703
704static void igmp6_group_added(struct ifmcaddr6 *mc)
705{
706 struct net_device *dev = mc->idev->dev;
707 char buf[MAX_ADDR_LEN];
708
709 spin_lock_bh(&mc->mca_lock);
710 if (!(mc->mca_flags&MAF_LOADED)) {
711 mc->mca_flags |= MAF_LOADED;
712 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
713 dev_mc_add(dev, buf, dev->addr_len, 0);
714 }
715 spin_unlock_bh(&mc->mca_lock);
716
717 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
718 return;
719
720 if (MLD_V1_SEEN(mc->idev)) {
721 igmp6_join_group(mc);
722 return;
723 }
724 /* else v2 */
725
726 mc->mca_crcount = mc->idev->mc_qrv;
727 mld_ifc_event(mc->idev);
728}
729
730static void igmp6_group_dropped(struct ifmcaddr6 *mc)
731{
732 struct net_device *dev = mc->idev->dev;
733 char buf[MAX_ADDR_LEN];
734
735 spin_lock_bh(&mc->mca_lock);
736 if (mc->mca_flags&MAF_LOADED) {
737 mc->mca_flags &= ~MAF_LOADED;
738 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
739 dev_mc_delete(dev, buf, dev->addr_len, 0);
740 }
741
742 if (mc->mca_flags & MAF_NOREPORT)
743 goto done;
744 spin_unlock_bh(&mc->mca_lock);
745
746 if (!mc->idev->dead)
747 igmp6_leave_group(mc);
748
749 spin_lock_bh(&mc->mca_lock);
750 if (del_timer(&mc->mca_timer))
751 atomic_dec(&mc->mca_refcnt);
752done:
753 ip6_mc_clear_src(mc);
754 spin_unlock_bh(&mc->mca_lock);
755}
756
757/*
758 * deleted ifmcaddr6 manipulation
759 */
760static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
761{
762 struct ifmcaddr6 *pmc;
763
764 /* this is an "ifmcaddr6" for convenience; only the fields below
765 * are actually used. In particular, the refcnt and users are not
766 * used for management of the delete list. Using the same structure
767 * for deleted items allows change reports to use common code with
768 * non-deleted or query-response MCA's.
769 */
8b3a7005 770 pmc = kmalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 771 if (!pmc)
772 return;
773 memset(pmc, 0, sizeof(*pmc));
774 spin_lock_bh(&im->mca_lock);
775 spin_lock_init(&pmc->mca_lock);
776 pmc->idev = im->idev;
777 in6_dev_hold(idev);
778 pmc->mca_addr = im->mca_addr;
779 pmc->mca_crcount = idev->mc_qrv;
780 pmc->mca_sfmode = im->mca_sfmode;
781 if (pmc->mca_sfmode == MCAST_INCLUDE) {
782 struct ip6_sf_list *psf;
783
784 pmc->mca_tomb = im->mca_tomb;
785 pmc->mca_sources = im->mca_sources;
786 im->mca_tomb = im->mca_sources = NULL;
787 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
788 psf->sf_crcount = pmc->mca_crcount;
789 }
790 spin_unlock_bh(&im->mca_lock);
791
792 write_lock_bh(&idev->mc_lock);
793 pmc->next = idev->mc_tomb;
794 idev->mc_tomb = pmc;
795 write_unlock_bh(&idev->mc_lock);
796}
797
798static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
799{
800 struct ifmcaddr6 *pmc, *pmc_prev;
801 struct ip6_sf_list *psf, *psf_next;
802
803 write_lock_bh(&idev->mc_lock);
804 pmc_prev = NULL;
805 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
806 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
807 break;
808 pmc_prev = pmc;
809 }
810 if (pmc) {
811 if (pmc_prev)
812 pmc_prev->next = pmc->next;
813 else
814 idev->mc_tomb = pmc->next;
815 }
816 write_unlock_bh(&idev->mc_lock);
817 if (pmc) {
818 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
819 psf_next = psf->sf_next;
820 kfree(psf);
821 }
822 in6_dev_put(pmc->idev);
823 kfree(pmc);
824 }
825}
826
827static void mld_clear_delrec(struct inet6_dev *idev)
828{
829 struct ifmcaddr6 *pmc, *nextpmc;
830
831 write_lock_bh(&idev->mc_lock);
832 pmc = idev->mc_tomb;
833 idev->mc_tomb = NULL;
834 write_unlock_bh(&idev->mc_lock);
835
836 for (; pmc; pmc = nextpmc) {
837 nextpmc = pmc->next;
838 ip6_mc_clear_src(pmc);
839 in6_dev_put(pmc->idev);
840 kfree(pmc);
841 }
842
843 /* clear dead sources, too */
844 read_lock_bh(&idev->lock);
845 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
846 struct ip6_sf_list *psf, *psf_next;
847
848 spin_lock_bh(&pmc->mca_lock);
849 psf = pmc->mca_tomb;
850 pmc->mca_tomb = NULL;
851 spin_unlock_bh(&pmc->mca_lock);
852 for (; psf; psf=psf_next) {
853 psf_next = psf->sf_next;
854 kfree(psf);
855 }
856 }
857 read_unlock_bh(&idev->lock);
858}
859
860
861/*
862 * device multicast group inc (add if not found)
863 */
864int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
865{
866 struct ifmcaddr6 *mc;
867 struct inet6_dev *idev;
868
869 idev = in6_dev_get(dev);
870
871 if (idev == NULL)
872 return -EINVAL;
873
874 write_lock_bh(&idev->lock);
875 if (idev->dead) {
876 write_unlock_bh(&idev->lock);
877 in6_dev_put(idev);
878 return -ENODEV;
879 }
880
881 for (mc = idev->mc_list; mc; mc = mc->next) {
882 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
883 mc->mca_users++;
884 write_unlock_bh(&idev->lock);
885 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
886 NULL, 0);
887 in6_dev_put(idev);
888 return 0;
889 }
890 }
891
892 /*
893 * not found: create a new one.
894 */
895
896 mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
897
898 if (mc == NULL) {
899 write_unlock_bh(&idev->lock);
900 in6_dev_put(idev);
901 return -ENOMEM;
902 }
903
904 memset(mc, 0, sizeof(struct ifmcaddr6));
905 init_timer(&mc->mca_timer);
906 mc->mca_timer.function = igmp6_timer_handler;
907 mc->mca_timer.data = (unsigned long) mc;
908
909 ipv6_addr_copy(&mc->mca_addr, addr);
910 mc->idev = idev;
911 mc->mca_users = 1;
912 /* mca_stamp should be updated upon changes */
913 mc->mca_cstamp = mc->mca_tstamp = jiffies;
914 atomic_set(&mc->mca_refcnt, 2);
915 spin_lock_init(&mc->mca_lock);
916
917 /* initial mode is (EX, empty) */
918 mc->mca_sfmode = MCAST_EXCLUDE;
919 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
920
921 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
922 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
923 mc->mca_flags |= MAF_NOREPORT;
924
925 mc->next = idev->mc_list;
926 idev->mc_list = mc;
927 write_unlock_bh(&idev->lock);
928
929 mld_del_delrec(idev, &mc->mca_addr);
930 igmp6_group_added(mc);
931 ma_put(mc);
932 return 0;
933}
934
935/*
936 * device multicast group del
937 */
938int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
939{
940 struct ifmcaddr6 *ma, **map;
941
942 write_lock_bh(&idev->lock);
943 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
944 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
945 if (--ma->mca_users == 0) {
946 *map = ma->next;
947 write_unlock_bh(&idev->lock);
948
949 igmp6_group_dropped(ma);
950
951 ma_put(ma);
952 return 0;
953 }
954 write_unlock_bh(&idev->lock);
955 return 0;
956 }
957 }
958 write_unlock_bh(&idev->lock);
959
960 return -ENOENT;
961}
962
963int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
964{
965 struct inet6_dev *idev = in6_dev_get(dev);
966 int err;
967
968 if (!idev)
969 return -ENODEV;
970
971 err = __ipv6_dev_mc_dec(idev, addr);
972
973 in6_dev_put(idev);
974
975 return err;
976}
977
978/*
979 * identify MLD packets for MLD filter exceptions
980 */
981int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
982{
983 struct icmp6hdr *pic;
984
985 if (nexthdr != IPPROTO_ICMPV6)
986 return 0;
987
988 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
989 return 0;
990
991 pic = (struct icmp6hdr *)skb->h.raw;
992
993 switch (pic->icmp6_type) {
994 case ICMPV6_MGM_QUERY:
995 case ICMPV6_MGM_REPORT:
996 case ICMPV6_MGM_REDUCTION:
997 case ICMPV6_MLD2_REPORT:
998 return 1;
999 default:
1000 break;
1001 }
1002 return 0;
1003}
1004
1005/*
1006 * check if the interface/address pair is valid
1007 */
1008int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1009 struct in6_addr *src_addr)
1010{
1011 struct inet6_dev *idev;
1012 struct ifmcaddr6 *mc;
1013 int rv = 0;
1014
1015 idev = in6_dev_get(dev);
1016 if (idev) {
1017 read_lock_bh(&idev->lock);
1018 for (mc = idev->mc_list; mc; mc=mc->next) {
1019 if (ipv6_addr_equal(&mc->mca_addr, group))
1020 break;
1021 }
1022 if (mc) {
1023 if (src_addr && !ipv6_addr_any(src_addr)) {
1024 struct ip6_sf_list *psf;
1025
1026 spin_lock_bh(&mc->mca_lock);
1027 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1028 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1029 break;
1030 }
1031 if (psf)
1032 rv = psf->sf_count[MCAST_INCLUDE] ||
1033 psf->sf_count[MCAST_EXCLUDE] !=
1034 mc->mca_sfcount[MCAST_EXCLUDE];
1035 else
1036 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1037 spin_unlock_bh(&mc->mca_lock);
1038 } else
1039 rv = 1; /* don't filter unspecified source */
1040 }
1041 read_unlock_bh(&idev->lock);
1042 in6_dev_put(idev);
1043 }
1044 return rv;
1045}
1046
1047static void mld_gq_start_timer(struct inet6_dev *idev)
1048{
1049 int tv = net_random() % idev->mc_maxdelay;
1050
1051 idev->mc_gq_running = 1;
1052 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1053 in6_dev_hold(idev);
1054}
1055
1056static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1057{
1058 int tv = net_random() % delay;
1059
1060 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1061 in6_dev_hold(idev);
1062}
1063
1064/*
1065 * IGMP handling (alias multicast ICMPv6 messages)
1066 */
1067
1068static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1069{
1070 unsigned long delay = resptime;
1071
1072 /* Do not start timer for these addresses */
1073 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1074 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1075 return;
1076
1077 if (del_timer(&ma->mca_timer)) {
1078 atomic_dec(&ma->mca_refcnt);
1079 delay = ma->mca_timer.expires - jiffies;
1080 }
1081
1082 if (delay >= resptime) {
1083 if (resptime)
1084 delay = net_random() % resptime;
1085 else
1086 delay = 1;
1087 }
1088 ma->mca_timer.expires = jiffies + delay;
1089 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1090 atomic_inc(&ma->mca_refcnt);
1091 ma->mca_flags |= MAF_TIMER_RUNNING;
1092}
1093
5ab4a6c8
DS		 1094/* mark EXCLUDE-mode sources */
1095static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1096 struct in6_addr *srcs)
1097{
1098 struct ip6_sf_list *psf;
1099 int i, scount;
1100
1101 scount = 0;
1102 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1103 if (scount == nsrcs)
1104 break;
5ab4a6c8
DS		 1105 for (i=0; i<nsrcs; i++) {
1106 /* skip inactive filters */
1107 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1108 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1109 psf->sf_count[MCAST_EXCLUDE])
1110 continue;
1111 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1112 scount++;
1113 break;
1114 }
1115 }
1116 }
1117 pmc->mca_flags &= ~MAF_GSQUERY;
1118 if (scount == nsrcs) /* all sources excluded */
1119 return 0;
1120 return 1;
1121}
1122
1123static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1124 struct in6_addr *srcs)
1125{
1126 struct ip6_sf_list *psf;
1127 int i, scount;
1128
1129 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1130 return mld_xmarksources(pmc, nsrcs, srcs);
1131
1132 /* mark INCLUDE-mode sources */
1133
1134 scount = 0;
1135 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1136 if (scount == nsrcs)
1137 break;
1138 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1139 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1140 psf->sf_gsresp = 1;
1141 scount++;
1142 break;
1143 }
5ab4a6c8
DS		 1144 }
1145 }
1146 if (!scount) {
1147 pmc->mca_flags &= ~MAF_GSQUERY;
1148 return 0;
1da177e4 1149 }
5ab4a6c8
DS		 1150 pmc->mca_flags |= MAF_GSQUERY;
1151 return 1;
1da177e4
LT		 1152}
1153
1154int igmp6_event_query(struct sk_buff *skb)
1155{
97300b5f 1156 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1157 struct ifmcaddr6 *ma;
1158 struct in6_addr *group;
1159 unsigned long max_delay;
1160 struct inet6_dev *idev;
1161 struct icmp6hdr *hdr;
1162 int group_type;
1163 int mark = 0;
1164 int len;
1165
1166 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1167 return -EINVAL;
1168
1169 /* compute payload length excluding extension headers */
1170 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1171 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1172
1173 /* Drop queries with not link local source */
1174 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1175 return -EINVAL;
1176
1177 idev = in6_dev_get(skb->dev);
1178
1179 if (idev == NULL)
1180 return 0;
1181
1182 hdr = (struct icmp6hdr *) skb->h.raw;
1183 group = (struct in6_addr *) (hdr + 1);
1184 group_type = ipv6_addr_type(group);
1185
1186 if (group_type != IPV6_ADDR_ANY &&
1187 !(group_type&IPV6_ADDR_MULTICAST)) {
1188 in6_dev_put(idev);
1189 return -EINVAL;
1190 }
1191
1192 if (len == 24) {
1193 int switchback;
1194 /* MLDv1 router present */
1195
1196 /* Translate milliseconds to jiffies */
1197 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1198
1199 switchback = (idev->mc_qrv + 1) * max_delay;
1200 idev->mc_v1_seen = jiffies + switchback;
1201
1202 /* cancel the interface change timer */
1203 idev->mc_ifc_count = 0;
1204 if (del_timer(&idev->mc_ifc_timer))
1205 __in6_dev_put(idev);
1206 /* clear deleted report items */
1207 mld_clear_delrec(idev);
1208 } else if (len >= 28) {
97300b5f
YZ		 1209 int srcs_offset = sizeof(struct mld2_query) -
1210 sizeof(struct icmp6hdr);
1211 if (!pskb_may_pull(skb, srcs_offset)) {
1212 in6_dev_put(idev);
1213 return -EINVAL;
1214 }
1215 mlh2 = (struct mld2_query *) skb->h.raw;
1da177e4
LT		 1216 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1217 if (!max_delay)
1218 max_delay = 1;
1219 idev->mc_maxdelay = max_delay;
1220 if (mlh2->qrv)
1221 idev->mc_qrv = mlh2->qrv;
1222 if (group_type == IPV6_ADDR_ANY) { /* general query */
1223 if (mlh2->nsrcs) {
1224 in6_dev_put(idev);
1225 return -EINVAL; /* no sources allowed */
1226 }
1227 mld_gq_start_timer(idev);
1228 in6_dev_put(idev);
1229 return 0;
1230 }
1231 /* mark sources to include, if group & source-specific */
97300b5f
YZ		 1232 if (mlh2->nsrcs != 0) {
1233 if (!pskb_may_pull(skb, srcs_offset +
5ab4a6c8 1234 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1235 in6_dev_put(idev);
1236 return -EINVAL;
1237 }
1238 mlh2 = (struct mld2_query *) skb->h.raw;
1239 mark = 1;
1240 }
1da177e4
LT		 1241 } else {
1242 in6_dev_put(idev);
1243 return -EINVAL;
1244 }
1245
1246 read_lock_bh(&idev->lock);
1247 if (group_type == IPV6_ADDR_ANY) {
1248 for (ma = idev->mc_list; ma; ma=ma->next) {
1249 spin_lock_bh(&ma->mca_lock);
1250 igmp6_group_queried(ma, max_delay);
1251 spin_unlock_bh(&ma->mca_lock);
1252 }
1253 } else {
1254 for (ma = idev->mc_list; ma; ma=ma->next) {
1255 if (group_type != IPV6_ADDR_ANY &&
1256 !ipv6_addr_equal(group, &ma->mca_addr))
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
DS		 1270 if (!(ma->mca_flags & MAF_GSQUERY) ||
1271 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1272 igmp6_group_queried(ma, max_delay);
1da177e4
LT		 1273 spin_unlock_bh(&ma->mca_lock);
1274 if (group_type != IPV6_ADDR_ANY)
1275 break;
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
1305 hdr = (struct icmp6hdr*) skb->h.raw;
1306
1307 /* Drop reports with not link local source */
1308 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1309 if (addr_type != IPV6_ADDR_ANY &&
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])
1354 return 0;
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{
1399 struct sock *sk = igmp6_socket->sk;
1400 struct sk_buff *skb;
1401 struct mld2_report *pmr;
1402 struct in6_addr addr_buf;
1403 int err;
1404 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1405 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1406 IPV6_TLV_PADN, 0 };
1407
1408 /* we assume size > sizeof(ra) here */
1409 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1410
1411 if (skb == 0)
1412 return NULL;
1413
1414 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4
LT		 1415
1416 if (ipv6_get_lladdr(dev, &addr_buf)) {
1417 /* <draft-ietf-magma-mld-source-05.txt>:
1418 * use unspecified address as the source address
1419 * when a valid link-local address is not available.
1420 */
1421 memset(&addr_buf, 0, sizeof(addr_buf));
1422 }
1423
1424 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1425
1426 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1427
1428 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1429 skb->h.raw = (unsigned char *)pmr;
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
1446 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
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,
1459 mld_dev_queue_xmit2);
1460}
1461
1da177e4
LT		 1462static void mld_sendpack(struct sk_buff *skb)
1463{
1464 struct ipv6hdr *pip6 = skb->nh.ipv6h;
1465 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1466 int payload_len, mldlen;
1467 struct inet6_dev *idev = in6_dev_get(skb->dev);
1468 int err;
1469
1470 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1471 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1472 sizeof(struct ipv6hdr);
1473 mldlen = skb->tail - skb->h.raw;
1474 pip6->payload_len = htons(payload_len);
1475
1476 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1477 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1478 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1479 mld_dev_queue_xmit);
1da177e4
LT		 1480 if (!err) {
1481 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1482 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1483 } else
1484 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1485
1486 if (likely(idev != NULL))
1487 in6_dev_put(idev);
1488}
1489
1490static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1491{
fab10fe3 1492 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1493}
1494
1495static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1496 int type, struct mld2_grec **ppgr)
1497{
1498 struct net_device *dev = pmc->idev->dev;
1499 struct mld2_report *pmr;
1500 struct mld2_grec *pgr;
1501
1502 if (!skb)
1503 skb = mld_newpack(dev, dev->mtu);
1504 if (!skb)
1505 return NULL;
1506 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1507 pgr->grec_type = type;
1508 pgr->grec_auxwords = 0;
1509 pgr->grec_nsrcs = 0;
1510 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1511 pmr = (struct mld2_report *)skb->h.raw;
1512 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1513 *ppgr = pgr;
1514 return skb;
1515}
1516
1517#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1518 skb_tailroom(skb)) : 0)
1519
1520static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1521 int type, int gdeleted, int sdeleted)
1522{
1523 struct net_device *dev = pmc->idev->dev;
1524 struct mld2_report *pmr;
1525 struct mld2_grec *pgr = NULL;
1526 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1527 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1528
1529 if (pmc->mca_flags & MAF_NOREPORT)
1530 return skb;
1531
1532 isquery = type == MLD2_MODE_IS_INCLUDE ||
1533 type == MLD2_MODE_IS_EXCLUDE;
1534 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1535 type == MLD2_CHANGE_TO_EXCLUDE;
1536
5ab4a6c8
DS		 1537 stotal = scount = 0;
1538
1da177e4
LT		 1539 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1540
5ab4a6c8
DS		 1541 if (!*psf_list)
1542 goto empty_source;
1543
1da177e4
LT		 1544 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1545
1546 /* EX and TO_EX get a fresh packet, if needed */
1547 if (truncate) {
1548 if (pmr && pmr->ngrec &&
1549 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1550 if (skb)
1551 mld_sendpack(skb);
1552 skb = mld_newpack(dev, dev->mtu);
1553 }
1554 }
1555 first = 1;
1da177e4
LT		 1556 psf_prev = NULL;
1557 for (psf=*psf_list; psf; psf=psf_next) {
1558 struct in6_addr *psrc;
1559
1560 psf_next = psf->sf_next;
1561
1562 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1563 psf_prev = psf;
1564 continue;
1565 }
1566
1567 /* clear marks on query responses */
1568 if (isquery)
1569 psf->sf_gsresp = 0;
1570
1571 if (AVAILABLE(skb) < sizeof(*psrc) +
1572 first*sizeof(struct mld2_grec)) {
1573 if (truncate && !first)
1574 break; /* truncate these */
1575 if (pgr)
1576 pgr->grec_nsrcs = htons(scount);
1577 if (skb)
1578 mld_sendpack(skb);
1579 skb = mld_newpack(dev, dev->mtu);
1580 first = 1;
1581 scount = 0;
1582 }
1583 if (first) {
1584 skb = add_grhead(skb, pmc, type, &pgr);
1585 first = 0;
1586 }
1587 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1588 *psrc = psf->sf_addr;
5ab4a6c8 1589 scount++; stotal++;
1da177e4
LT		 1590 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1591 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1592 psf->sf_crcount--;
1593 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1594 if (psf_prev)
1595 psf_prev->sf_next = psf->sf_next;
1596 else
1597 *psf_list = psf->sf_next;
1598 kfree(psf);
1599 continue;
1600 }
1601 }
1602 psf_prev = psf;
1603 }
5ab4a6c8
DS		 1604
1605empty_source:
1606 if (!stotal) {
1607 if (type == MLD2_ALLOW_NEW_SOURCES ||
1608 type == MLD2_BLOCK_OLD_SOURCES)
1609 return skb;
1610 if (pmc->mca_crcount || isquery) {
1611 /* make sure we have room for group header */
1612 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1613 mld_sendpack(skb);
1614 skb = NULL; /* add_grhead will get a new one */
1615 }
1616 skb = add_grhead(skb, pmc, type, &pgr);
1617 }
1618 }
1da177e4
LT		 1619 if (pgr)
1620 pgr->grec_nsrcs = htons(scount);
1621
1622 if (isquery)
1623 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1624 return skb;
1625}
1626
1627static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1628{
1629 struct sk_buff *skb = NULL;
1630 int type;
1631
1632 if (!pmc) {
1633 read_lock_bh(&idev->lock);
1634 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1635 if (pmc->mca_flags & MAF_NOREPORT)
1636 continue;
1637 spin_lock_bh(&pmc->mca_lock);
1638 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1639 type = MLD2_MODE_IS_EXCLUDE;
1640 else
1641 type = MLD2_MODE_IS_INCLUDE;
1642 skb = add_grec(skb, pmc, type, 0, 0);
1643 spin_unlock_bh(&pmc->mca_lock);
1644 }
1645 read_unlock_bh(&idev->lock);
1646 } else {
1647 spin_lock_bh(&pmc->mca_lock);
1648 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1649 type = MLD2_MODE_IS_EXCLUDE;
1650 else
1651 type = MLD2_MODE_IS_INCLUDE;
1652 skb = add_grec(skb, pmc, type, 0, 0);
1653 spin_unlock_bh(&pmc->mca_lock);
1654 }
1655 if (skb)
1656 mld_sendpack(skb);
1657}
1658
1659/*
1660 * remove zero-count source records from a source filter list
1661 */
1662static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1663{
1664 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1665
1666 psf_prev = NULL;
1667 for (psf=*ppsf; psf; psf = psf_next) {
1668 psf_next = psf->sf_next;
1669 if (psf->sf_crcount == 0) {
1670 if (psf_prev)
1671 psf_prev->sf_next = psf->sf_next;
1672 else
1673 *ppsf = psf->sf_next;
1674 kfree(psf);
1675 } else
1676 psf_prev = psf;
1677 }
1678}
1679
1680static void mld_send_cr(struct inet6_dev *idev)
1681{
1682 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1683 struct sk_buff *skb = NULL;
1684 int type, dtype;
1685
1686 read_lock_bh(&idev->lock);
1687 write_lock_bh(&idev->mc_lock);
1688
1689 /* deleted MCA's */
1690 pmc_prev = NULL;
1691 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1692 pmc_next = pmc->next;
1693 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1694 type = MLD2_BLOCK_OLD_SOURCES;
1695 dtype = MLD2_BLOCK_OLD_SOURCES;
1696 skb = add_grec(skb, pmc, type, 1, 0);
1697 skb = add_grec(skb, pmc, dtype, 1, 1);
1698 }
1699 if (pmc->mca_crcount) {
1da177e4
LT		 1700 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1701 type = MLD2_CHANGE_TO_INCLUDE;
1702 skb = add_grec(skb, pmc, type, 1, 0);
1703 }
5ab4a6c8 1704 pmc->mca_crcount--;
1da177e4
LT		 1705 if (pmc->mca_crcount == 0) {
1706 mld_clear_zeros(&pmc->mca_tomb);
1707 mld_clear_zeros(&pmc->mca_sources);
1708 }
1709 }
1710 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1711 !pmc->mca_sources) {
1712 if (pmc_prev)
1713 pmc_prev->next = pmc_next;
1714 else
1715 idev->mc_tomb = pmc_next;
1716 in6_dev_put(pmc->idev);
1717 kfree(pmc);
1718 } else
1719 pmc_prev = pmc;
1720 }
1721 write_unlock_bh(&idev->mc_lock);
1722
1723 /* change recs */
1724 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1725 spin_lock_bh(&pmc->mca_lock);
1726 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1727 type = MLD2_BLOCK_OLD_SOURCES;
1728 dtype = MLD2_ALLOW_NEW_SOURCES;
1729 } else {
1730 type = MLD2_ALLOW_NEW_SOURCES;
1731 dtype = MLD2_BLOCK_OLD_SOURCES;
1732 }
1733 skb = add_grec(skb, pmc, type, 0, 0);
1734 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1735
1736 /* filter mode changes */
1737 if (pmc->mca_crcount) {
1da177e4
LT		 1738 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1739 type = MLD2_CHANGE_TO_EXCLUDE;
1740 else
1741 type = MLD2_CHANGE_TO_INCLUDE;
1742 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1743 pmc->mca_crcount--;
1da177e4
LT		 1744 }
1745 spin_unlock_bh(&pmc->mca_lock);
1746 }
1747 read_unlock_bh(&idev->lock);
1748 if (!skb)
1749 return;
1750 (void) mld_sendpack(skb);
1751}
1752
1753static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1754{
1755 struct sock *sk = igmp6_socket->sk;
1756 struct inet6_dev *idev;
1757 struct sk_buff *skb;
1758 struct icmp6hdr *hdr;
1759 struct in6_addr *snd_addr;
1760 struct in6_addr *addrp;
1761 struct in6_addr addr_buf;
1762 struct in6_addr all_routers;
1763 int err, len, payload_len, full_len;
1764 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1765 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1766 IPV6_TLV_PADN, 0 };
1767
1768 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1769 snd_addr = addr;
1770 if (type == ICMPV6_MGM_REDUCTION) {
1771 snd_addr = &all_routers;
1772 ipv6_addr_all_routers(&all_routers);
1773 }
1774
1775 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1776 payload_len = len + sizeof(ra);
1777 full_len = sizeof(struct ipv6hdr) + payload_len;
1778
1779 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1780
1781 if (skb == NULL) {
1782 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1783 return;
1784 }
1785
1786 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4
LT		 1787
1788 if (ipv6_get_lladdr(dev, &addr_buf)) {
1789 /* <draft-ietf-magma-mld-source-05.txt>:
1790 * use unspecified address as the source address
1791 * when a valid link-local address is not available.
1792 */
1793 memset(&addr_buf, 0, sizeof(addr_buf));
1794 }
1795
1796 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1797
1798 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1799
1800 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1801 memset(hdr, 0, sizeof(struct icmp6hdr));
1802 hdr->icmp6_type = type;
1803
1804 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1805 ipv6_addr_copy(addrp, addr);
1806
1807 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1808 IPPROTO_ICMPV6,
1809 csum_partial((__u8 *) hdr, len, 0));
1810
1811 idev = in6_dev_get(skb->dev);
1812
1813 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1814 mld_dev_queue_xmit);
1da177e4
LT		 1815 if (!err) {
1816 if (type == ICMPV6_MGM_REDUCTION)
1817 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1818 else
1819 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1820 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1821 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1822 } else
1823 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1824
1825 if (likely(idev != NULL))
1826 in6_dev_put(idev);
1827 return;
1da177e4
LT		 1828}
1829
1830static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1831 struct in6_addr *psfsrc)
1832{
1833 struct ip6_sf_list *psf, *psf_prev;
1834 int rv = 0;
1835
1836 psf_prev = NULL;
1837 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1838 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1839 break;
1840 psf_prev = psf;
1841 }
1842 if (!psf || psf->sf_count[sfmode] == 0) {
1843 /* source filter not found, or count wrong => bug */
1844 return -ESRCH;
1845 }
1846 psf->sf_count[sfmode]--;
1847 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1848 struct inet6_dev *idev = pmc->idev;
1849
1850 /* no more filters for this source */
1851 if (psf_prev)
1852 psf_prev->sf_next = psf->sf_next;
1853 else
1854 pmc->mca_sources = psf->sf_next;
1855 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1856 !MLD_V1_SEEN(idev)) {
1857 psf->sf_crcount = idev->mc_qrv;
1858 psf->sf_next = pmc->mca_tomb;
1859 pmc->mca_tomb = psf;
1860 rv = 1;
1861 } else
1862 kfree(psf);
1863 }
1864 return rv;
1865}
1866
1867static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1868 int sfmode, int sfcount, struct in6_addr *psfsrc,
1869 int delta)
1870{
1871 struct ifmcaddr6 *pmc;
1872 int changerec = 0;
1873 int i, err;
1874
1875 if (!idev)
1876 return -ENODEV;
1877 read_lock_bh(&idev->lock);
1878 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1879 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1880 break;
1881 }
1882 if (!pmc) {
1883 /* MCA not found?? bug */
1884 read_unlock_bh(&idev->lock);
1885 return -ESRCH;
1886 }
1887 spin_lock_bh(&pmc->mca_lock);
1888 sf_markstate(pmc);
1889 if (!delta) {
1890 if (!pmc->mca_sfcount[sfmode]) {
1891 spin_unlock_bh(&pmc->mca_lock);
1892 read_unlock_bh(&idev->lock);
1893 return -EINVAL;
1894 }
1895 pmc->mca_sfcount[sfmode]--;
1896 }
1897 err = 0;
1898 for (i=0; i<sfcount; i++) {
1899 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1900
1901 changerec |= rv > 0;
1902 if (!err && rv < 0)
1903 err = rv;
1904 }
1905 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1906 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1907 pmc->mca_sfcount[MCAST_INCLUDE]) {
1908 struct ip6_sf_list *psf;
1909
1910 /* filter mode change */
1911 pmc->mca_sfmode = MCAST_INCLUDE;
1912 pmc->mca_crcount = idev->mc_qrv;
1913 idev->mc_ifc_count = pmc->mca_crcount;
1914 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1915 psf->sf_crcount = 0;
1916 mld_ifc_event(pmc->idev);
1917 } else if (sf_setstate(pmc) || changerec)
1918 mld_ifc_event(pmc->idev);
1919 spin_unlock_bh(&pmc->mca_lock);
1920 read_unlock_bh(&idev->lock);
1921 return err;
1922}
1923
1924/*
1925 * Add multicast single-source filter to the interface list
1926 */
1927static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1928 struct in6_addr *psfsrc, int delta)
1929{
1930 struct ip6_sf_list *psf, *psf_prev;
1931
1932 psf_prev = NULL;
1933 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1934 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1935 break;
1936 psf_prev = psf;
1937 }
1938 if (!psf) {
8b3a7005 1939 psf = kmalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1940 if (!psf)
1941 return -ENOBUFS;
1942 memset(psf, 0, sizeof(*psf));
1943 psf->sf_addr = *psfsrc;
1944 if (psf_prev) {
1945 psf_prev->sf_next = psf;
1946 } else
1947 pmc->mca_sources = psf;
1948 }
1949 psf->sf_count[sfmode]++;
1950 return 0;
1951}
1952
1953static void sf_markstate(struct ifmcaddr6 *pmc)
1954{
1955 struct ip6_sf_list *psf;
1956 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1957
1958 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1959 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1960 psf->sf_oldin = mca_xcount ==
1961 psf->sf_count[MCAST_EXCLUDE] &&
1962 !psf->sf_count[MCAST_INCLUDE];
1963 } else
1964 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1965}
1966
1967static int sf_setstate(struct ifmcaddr6 *pmc)
1968{
1969 struct ip6_sf_list *psf;
1970 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1971 int qrv = pmc->idev->mc_qrv;
1972 int new_in, rv;
1973
1974 rv = 0;
1975 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1976 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1977 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1978 !psf->sf_count[MCAST_INCLUDE];
1979 } else
1980 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1981 if (new_in != psf->sf_oldin) {
1982 psf->sf_crcount = qrv;
1983 rv++;
1984 }
1985 }
1986 return rv;
1987}
1988
1989/*
1990 * Add multicast source filter list to the interface list
1991 */
1992static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
1993 int sfmode, int sfcount, struct in6_addr *psfsrc,
1994 int delta)
1995{
1996 struct ifmcaddr6 *pmc;
1997 int isexclude;
1998 int i, err;
1999
2000 if (!idev)
2001 return -ENODEV;
2002 read_lock_bh(&idev->lock);
2003 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2004 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2005 break;
2006 }
2007 if (!pmc) {
2008 /* MCA not found?? bug */
2009 read_unlock_bh(&idev->lock);
2010 return -ESRCH;
2011 }
2012 spin_lock_bh(&pmc->mca_lock);
2013
2014 sf_markstate(pmc);
2015 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2016 if (!delta)
2017 pmc->mca_sfcount[sfmode]++;
2018 err = 0;
2019 for (i=0; i<sfcount; i++) {
2020 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2021 if (err)
2022 break;
2023 }
2024 if (err) {
2025 int j;
2026
2027 if (!delta)
2028 pmc->mca_sfcount[sfmode]--;
2029 for (j=0; j<i; j++)
2030 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2031 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2032 struct inet6_dev *idev = pmc->idev;
2033 struct ip6_sf_list *psf;
2034
2035 /* filter mode change */
2036 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2037 pmc->mca_sfmode = MCAST_EXCLUDE;
2038 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2039 pmc->mca_sfmode = MCAST_INCLUDE;
2040 /* else no filters; keep old mode for reports */
2041
2042 pmc->mca_crcount = idev->mc_qrv;
2043 idev->mc_ifc_count = pmc->mca_crcount;
2044 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2045 psf->sf_crcount = 0;
2046 mld_ifc_event(idev);
2047 } else if (sf_setstate(pmc))
2048 mld_ifc_event(idev);
2049 spin_unlock_bh(&pmc->mca_lock);
2050 read_unlock_bh(&idev->lock);
2051 return err;
2052}
2053
2054static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2055{
2056 struct ip6_sf_list *psf, *nextpsf;
2057
2058 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2059 nextpsf = psf->sf_next;
2060 kfree(psf);
2061 }
2062 pmc->mca_tomb = NULL;
2063 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2064 nextpsf = psf->sf_next;
2065 kfree(psf);
2066 }
2067 pmc->mca_sources = NULL;
2068 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2069 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2070 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2071}
2072
2073
2074static void igmp6_join_group(struct ifmcaddr6 *ma)
2075{
2076 unsigned long delay;
2077
2078 if (ma->mca_flags & MAF_NOREPORT)
2079 return;
2080
2081 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2082
2083 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2084
2085 spin_lock_bh(&ma->mca_lock);
2086 if (del_timer(&ma->mca_timer)) {
2087 atomic_dec(&ma->mca_refcnt);
2088 delay = ma->mca_timer.expires - jiffies;
2089 }
2090
2091 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2092 atomic_inc(&ma->mca_refcnt);
2093 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2094 spin_unlock_bh(&ma->mca_lock);
2095}
2096
2097static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2098 struct inet6_dev *idev)
2099{
2100 int err;
2101
5ab4a6c8
DS		 2102 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2103 * so no other readers or writers of iml or its sflist
2104 */
1da177e4
LT		 2105 if (iml->sflist == 0) {
2106 /* any-source empty exclude case */
2107 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2108 }
2109 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2110 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2111 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2112 iml->sflist = NULL;
2113 return err;
2114}
2115
2116static void igmp6_leave_group(struct ifmcaddr6 *ma)
2117{
2118 if (MLD_V1_SEEN(ma->idev)) {
2119 if (ma->mca_flags & MAF_LAST_REPORTER)
2120 igmp6_send(&ma->mca_addr, ma->idev->dev,
2121 ICMPV6_MGM_REDUCTION);
2122 } else {
2123 mld_add_delrec(ma->idev, ma);
2124 mld_ifc_event(ma->idev);
2125 }
2126}
2127
2128static void mld_gq_timer_expire(unsigned long data)
2129{
2130 struct inet6_dev *idev = (struct inet6_dev *)data;
2131
2132 idev->mc_gq_running = 0;
2133 mld_send_report(idev, NULL);
2134 __in6_dev_put(idev);
2135}
2136
2137static void mld_ifc_timer_expire(unsigned long data)
2138{
2139 struct inet6_dev *idev = (struct inet6_dev *)data;
2140
2141 mld_send_cr(idev);
2142 if (idev->mc_ifc_count) {
2143 idev->mc_ifc_count--;
2144 if (idev->mc_ifc_count)
2145 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2146 }
2147 __in6_dev_put(idev);
2148}
2149
2150static void mld_ifc_event(struct inet6_dev *idev)
2151{
2152 if (MLD_V1_SEEN(idev))
2153 return;
2154 idev->mc_ifc_count = idev->mc_qrv;
2155 mld_ifc_start_timer(idev, 1);
2156}
2157
2158
2159static void igmp6_timer_handler(unsigned long data)
2160{
2161 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2162
2163 if (MLD_V1_SEEN(ma->idev))
2164 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2165 else
2166 mld_send_report(ma->idev, ma);
2167
2168 spin_lock(&ma->mca_lock);
2169 ma->mca_flags |= MAF_LAST_REPORTER;
2170 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2171 spin_unlock(&ma->mca_lock);
2172 ma_put(ma);
2173}
2174
2175/* Device going down */
2176
2177void ipv6_mc_down(struct inet6_dev *idev)
2178{
2179 struct ifmcaddr6 *i;
2180
2181 /* Withdraw multicast list */
2182
2183 read_lock_bh(&idev->lock);
2184 idev->mc_ifc_count = 0;
2185 if (del_timer(&idev->mc_ifc_timer))
2186 __in6_dev_put(idev);
2187 idev->mc_gq_running = 0;
2188 if (del_timer(&idev->mc_gq_timer))
2189 __in6_dev_put(idev);
2190
2191 for (i = idev->mc_list; i; i=i->next)
2192 igmp6_group_dropped(i);
2193 read_unlock_bh(&idev->lock);
2194
2195 mld_clear_delrec(idev);
2196}
2197
2198
2199/* Device going up */
2200
2201void ipv6_mc_up(struct inet6_dev *idev)
2202{
2203 struct ifmcaddr6 *i;
2204
2205 /* Install multicast list, except for all-nodes (already installed) */
2206
2207 read_lock_bh(&idev->lock);
2208 for (i = idev->mc_list; i; i=i->next)
2209 igmp6_group_added(i);
2210 read_unlock_bh(&idev->lock);
2211}
2212
2213/* IPv6 device initialization. */
2214
2215void ipv6_mc_init_dev(struct inet6_dev *idev)
2216{
2217 struct in6_addr maddr;
2218
2219 write_lock_bh(&idev->lock);
2220 rwlock_init(&idev->mc_lock);
2221 idev->mc_gq_running = 0;
2222 init_timer(&idev->mc_gq_timer);
2223 idev->mc_gq_timer.data = (unsigned long) idev;
2224 idev->mc_gq_timer.function = &mld_gq_timer_expire;
2225 idev->mc_tomb = NULL;
2226 idev->mc_ifc_count = 0;
2227 init_timer(&idev->mc_ifc_timer);
2228 idev->mc_ifc_timer.data = (unsigned long) idev;
2229 idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2230 idev->mc_qrv = MLD_QRV_DEFAULT;
2231 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2232 idev->mc_v1_seen = 0;
2233 write_unlock_bh(&idev->lock);
2234
2235 /* Add all-nodes address. */
2236 ipv6_addr_all_nodes(&maddr);
2237 ipv6_dev_mc_inc(idev->dev, &maddr);
2238}
2239
2240/*
2241 * Device is about to be destroyed: clean up.
2242 */
2243
2244void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2245{
2246 struct ifmcaddr6 *i;
2247 struct in6_addr maddr;
2248
2249 /* Deactivate timers */
2250 ipv6_mc_down(idev);
2251
2252 /* Delete all-nodes address. */
2253 ipv6_addr_all_nodes(&maddr);
2254
2255 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2256 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2257 * fail.
2258 */
2259 __ipv6_dev_mc_dec(idev, &maddr);
2260
2261 if (idev->cnf.forwarding) {
2262 ipv6_addr_all_routers(&maddr);
2263 __ipv6_dev_mc_dec(idev, &maddr);
2264 }
2265
2266 write_lock_bh(&idev->lock);
2267 while ((i = idev->mc_list) != NULL) {
2268 idev->mc_list = i->next;
2269 write_unlock_bh(&idev->lock);
2270
2271 igmp6_group_dropped(i);
2272 ma_put(i);
2273
2274 write_lock_bh(&idev->lock);
2275 }
2276 write_unlock_bh(&idev->lock);
2277}
2278
2279#ifdef CONFIG_PROC_FS
2280struct igmp6_mc_iter_state {
2281 struct net_device *dev;
2282 struct inet6_dev *idev;
2283};
2284
2285#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2286
2287static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2288{
2289 struct ifmcaddr6 *im = NULL;
2290 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2291
2292 for (state->dev = dev_base, state->idev = NULL;
2293 state->dev;
2294 state->dev = state->dev->next) {
2295 struct inet6_dev *idev;
2296 idev = in6_dev_get(state->dev);
2297 if (!idev)
2298 continue;
2299 read_lock_bh(&idev->lock);
2300 im = idev->mc_list;
2301 if (im) {
2302 state->idev = idev;
2303 break;
2304 }
2305 read_unlock_bh(&idev->lock);
2306 in6_dev_put(idev);
2307 }
2308 return im;
2309}
2310
2311static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2312{
2313 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2314
2315 im = im->next;
2316 while (!im) {
2317 if (likely(state->idev != NULL)) {
2318 read_unlock_bh(&state->idev->lock);
2319 in6_dev_put(state->idev);
2320 }
2321 state->dev = state->dev->next;
2322 if (!state->dev) {
2323 state->idev = NULL;
2324 break;
2325 }
2326 state->idev = in6_dev_get(state->dev);
2327 if (!state->idev)
2328 continue;
2329 read_lock_bh(&state->idev->lock);
2330 im = state->idev->mc_list;
2331 }
2332 return im;
2333}
2334
2335static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2336{
2337 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2338 if (im)
2339 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2340 --pos;
2341 return pos ? NULL : im;
2342}
2343
2344static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2345{
2346 read_lock(&dev_base_lock);
2347 return igmp6_mc_get_idx(seq, *pos);
2348}
2349
2350static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2351{
2352 struct ifmcaddr6 *im;
2353 im = igmp6_mc_get_next(seq, v);
2354 ++*pos;
2355 return im;
2356}
2357
2358static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2359{
2360 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2361 if (likely(state->idev != NULL)) {
2362 read_unlock_bh(&state->idev->lock);
2363 in6_dev_put(state->idev);
2364 state->idev = NULL;
2365 }
2366 state->dev = NULL;
2367 read_unlock(&dev_base_lock);
2368}
2369
2370static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2371{
2372 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2373 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2374
2375 seq_printf(seq,
9343e79a 2376 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
1da177e4
LT		 2377 state->dev->ifindex, state->dev->name,
2378 NIP6(im->mca_addr),
2379 im->mca_users, im->mca_flags,
2380 (im->mca_flags&MAF_TIMER_RUNNING) ?
2381 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2382 return 0;
2383}
2384
2385static struct seq_operations igmp6_mc_seq_ops = {
2386 .start = igmp6_mc_seq_start,
2387 .next = igmp6_mc_seq_next,
2388 .stop = igmp6_mc_seq_stop,
2389 .show = igmp6_mc_seq_show,
2390};
2391
2392static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2393{
2394 struct seq_file *seq;
2395 int rc = -ENOMEM;
2396 struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2397
2398 if (!s)
2399 goto out;
2400
2401 rc = seq_open(file, &igmp6_mc_seq_ops);
2402 if (rc)
2403 goto out_kfree;
2404
2405 seq = file->private_data;
2406 seq->private = s;
2407 memset(s, 0, sizeof(*s));
2408out:
2409 return rc;
2410out_kfree:
2411 kfree(s);
2412 goto out;
2413}
2414
2415static struct file_operations igmp6_mc_seq_fops = {
2416 .owner = THIS_MODULE,
2417 .open = igmp6_mc_seq_open,
2418 .read = seq_read,
2419 .llseek = seq_lseek,
2420 .release = seq_release_private,
2421};
2422
2423struct igmp6_mcf_iter_state {
2424 struct net_device *dev;
2425 struct inet6_dev *idev;
2426 struct ifmcaddr6 *im;
2427};
2428
2429#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2430
2431static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2432{
2433 struct ip6_sf_list *psf = NULL;
2434 struct ifmcaddr6 *im = NULL;
2435 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2436
2437 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2438 state->dev;
2439 state->dev = state->dev->next) {
2440 struct inet6_dev *idev;
2441 idev = in6_dev_get(state->dev);
2442 if (unlikely(idev == NULL))
2443 continue;
2444 read_lock_bh(&idev->lock);
2445 im = idev->mc_list;
2446 if (likely(im != NULL)) {
2447 spin_lock_bh(&im->mca_lock);
2448 psf = im->mca_sources;
2449 if (likely(psf != NULL)) {
2450 state->im = im;
2451 state->idev = idev;
2452 break;
2453 }
2454 spin_unlock_bh(&im->mca_lock);
2455 }
2456 read_unlock_bh(&idev->lock);
2457 in6_dev_put(idev);
2458 }
2459 return psf;
2460}
2461
2462static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2463{
2464 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2465
2466 psf = psf->sf_next;
2467 while (!psf) {
2468 spin_unlock_bh(&state->im->mca_lock);
2469 state->im = state->im->next;
2470 while (!state->im) {
2471 if (likely(state->idev != NULL)) {
2472 read_unlock_bh(&state->idev->lock);
2473 in6_dev_put(state->idev);
2474 }
2475 state->dev = state->dev->next;
2476 if (!state->dev) {
2477 state->idev = NULL;
2478 goto out;
2479 }
2480 state->idev = in6_dev_get(state->dev);
2481 if (!state->idev)
2482 continue;
2483 read_lock_bh(&state->idev->lock);
2484 state->im = state->idev->mc_list;
2485 }
2486 if (!state->im)
2487 break;
2488 spin_lock_bh(&state->im->mca_lock);
2489 psf = state->im->mca_sources;
2490 }
2491out:
2492 return psf;
2493}
2494
2495static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2496{
2497 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2498 if (psf)
2499 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2500 --pos;
2501 return pos ? NULL : psf;
2502}
2503
2504static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2505{
2506 read_lock(&dev_base_lock);
2507 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2508}
2509
2510static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2511{
2512 struct ip6_sf_list *psf;
2513 if (v == SEQ_START_TOKEN)
2514 psf = igmp6_mcf_get_first(seq);
2515 else
2516 psf = igmp6_mcf_get_next(seq, v);
2517 ++*pos;
2518 return psf;
2519}
2520
2521static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2522{
2523 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2524 if (likely(state->im != NULL)) {
2525 spin_unlock_bh(&state->im->mca_lock);
2526 state->im = NULL;
2527 }
2528 if (likely(state->idev != NULL)) {
2529 read_unlock_bh(&state->idev->lock);
2530 in6_dev_put(state->idev);
2531 state->idev = NULL;
2532 }
2533 state->dev = NULL;
2534 read_unlock(&dev_base_lock);
2535}
2536
2537static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2538{
2539 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2540 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2541
2542 if (v == SEQ_START_TOKEN) {
2543 seq_printf(seq,
2544 "%3s %6s "
9343e79a 2545 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2546 "Device", "Multicast Address",
2547 "Source Address", "INC", "EXC");
2548 } else {
2549 seq_printf(seq,
9343e79a 2550 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
1da177e4
LT		 2551 state->dev->ifindex, state->dev->name,
2552 NIP6(state->im->mca_addr),
2553 NIP6(psf->sf_addr),
2554 psf->sf_count[MCAST_INCLUDE],
2555 psf->sf_count[MCAST_EXCLUDE]);
2556 }
2557 return 0;
2558}
2559
2560static struct seq_operations igmp6_mcf_seq_ops = {
2561 .start = igmp6_mcf_seq_start,
2562 .next = igmp6_mcf_seq_next,
2563 .stop = igmp6_mcf_seq_stop,
2564 .show = igmp6_mcf_seq_show,
2565};
2566
2567static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2568{
2569 struct seq_file *seq;
2570 int rc = -ENOMEM;
2571 struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2572
2573 if (!s)
2574 goto out;
2575
2576 rc = seq_open(file, &igmp6_mcf_seq_ops);
2577 if (rc)
2578 goto out_kfree;
2579
2580 seq = file->private_data;
2581 seq->private = s;
2582 memset(s, 0, sizeof(*s));
2583out:
2584 return rc;
2585out_kfree:
2586 kfree(s);
2587 goto out;
2588}
2589
2590static struct file_operations igmp6_mcf_seq_fops = {
2591 .owner = THIS_MODULE,
2592 .open = igmp6_mcf_seq_open,
2593 .read = seq_read,
2594 .llseek = seq_lseek,
2595 .release = seq_release_private,
2596};
2597#endif
2598
2599int __init igmp6_init(struct net_proto_family *ops)
2600{
2601 struct ipv6_pinfo *np;
2602 struct sock *sk;
2603 int err;
2604
2605 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2606 if (err < 0) {
2607 printk(KERN_ERR
2608 "Failed to initialize the IGMP6 control socket (err %d).\n",
2609 err);
2610 igmp6_socket = NULL; /* For safety. */
2611 return err;
2612 }
2613
2614 sk = igmp6_socket->sk;
2615 sk->sk_allocation = GFP_ATOMIC;
2616 sk->sk_prot->unhash(sk);
2617
2618 np = inet6_sk(sk);
2619 np->hop_limit = 1;
2620
2621#ifdef CONFIG_PROC_FS
2622 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2623 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2624#endif
2625
2626 return 0;
2627}
2628
2629void igmp6_cleanup(void)
2630{
2631 sock_release(igmp6_socket);
2632 igmp6_socket = NULL; /* for safety */
2633
2634#ifdef CONFIG_PROC_FS
2635 proc_net_remove("mcfilter6");
2636 proc_net_remove("igmp6");
2637#endif
2638}
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