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[IPV6] ADDRCONF: Uninline ipv6_isatap_eui64().
[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>
1ed8516f 62#include <net/inet_common.h>
1da177e4
LT		 63
64#include <net/ip6_checksum.h>
65
66/* Set to 3 to get tracing... */
67#define MCAST_DEBUG 2
68
69#if MCAST_DEBUG >= 3
70#define MDBG(x) printk x
71#else
72#define MDBG(x)
73#endif
74
75/*
76 * These header formats should be in a separate include file, but icmpv6.h
77 * doesn't have in6_addr defined in all cases, there is no __u128, and no
78 * other files reference these.
79 *
80 * +-DLS 4/14/03
81 */
82
83/* Multicast Listener Discovery version 2 headers */
84
85struct mld2_grec {
86 __u8 grec_type;
87 __u8 grec_auxwords;
8a74ff77 88 __be16 grec_nsrcs;
1da177e4
LT		 89 struct in6_addr grec_mca;
90 struct in6_addr grec_src[0];
91};
92
93struct mld2_report {
94 __u8 type;
95 __u8 resv1;
868c86bc 96 __sum16 csum;
8a74ff77
AV		 97 __be16 resv2;
98 __be16 ngrec;
1da177e4
LT		 99 struct mld2_grec grec[0];
100};
101
102struct mld2_query {
103 __u8 type;
104 __u8 code;
868c86bc 105 __sum16 csum;
8a74ff77
AV		 106 __be16 mrc;
107 __be16 resv1;
1da177e4
LT		 108 struct in6_addr mca;
109#if defined(__LITTLE_ENDIAN_BITFIELD)
110 __u8 qrv:3,
111 suppress:1,
112 resv2:4;
113#elif defined(__BIG_ENDIAN_BITFIELD)
114 __u8 resv2:4,
115 suppress:1,
116 qrv:3;
117#else
118#error "Please fix <asm/byteorder.h>"
119#endif
120 __u8 qqic;
8a74ff77 121 __be16 nsrcs;
1da177e4
LT		 122 struct in6_addr srcs[0];
123};
124
125static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
126
127/* Big mc list lock for all the sockets */
128static DEFINE_RWLOCK(ipv6_sk_mc_lock);
129
1da177e4
LT		 130int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
131
132static void igmp6_join_group(struct ifmcaddr6 *ma);
133static void igmp6_leave_group(struct ifmcaddr6 *ma);
134static void igmp6_timer_handler(unsigned long data);
135
136static void mld_gq_timer_expire(unsigned long data);
137static void mld_ifc_timer_expire(unsigned long data);
138static void mld_ifc_event(struct inet6_dev *idev);
139static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
140static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
141static void mld_clear_delrec(struct inet6_dev *idev);
142static int sf_setstate(struct ifmcaddr6 *pmc);
143static void sf_markstate(struct ifmcaddr6 *pmc);
144static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
145static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
146 int sfmode, int sfcount, struct in6_addr *psfsrc,
147 int delta);
148static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
149 int sfmode, int sfcount, struct in6_addr *psfsrc,
150 int delta);
151static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
152 struct inet6_dev *idev);
153
154
155#define IGMP6_UNSOLICITED_IVAL (10*HZ)
156#define MLD_QRV_DEFAULT 2
157
158#define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
159 (idev)->cnf.force_mld_version == 1 || \
160 ((idev)->mc_v1_seen && \
161 time_before(jiffies, (idev)->mc_v1_seen)))
162
163#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
164#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
165 ((value) < (thresh) ? (value) : \
f12baeab 166 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
1da177e4
LT		 167 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
168
169#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
170#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
171
6f4353d8 172#define IPV6_MLD_MAX_MSF 64
1da177e4 173
ab32ea5d 174int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 175
176/*
177 * socket join on multicast group
178 */
179
180int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
181{
182 struct net_device *dev = NULL;
183 struct ipv6_mc_socklist *mc_lst;
184 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 185 struct net *net = sock_net(sk);
1da177e4
LT		 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;
b8ad0cbc 211 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4
LT		 212 if (rt) {
213 dev = rt->rt6i_dev;
214 dev_hold(dev);
215 dst_release(&rt->u.dst);
216 }
217 } else
b8ad0cbc 218 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 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;
3b1e0a65 259 struct net *net = sock_net(sk);
1da177e4
LT		 260
261 write_lock_bh(&ipv6_sk_mc_lock);
262 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
263 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
264 ipv6_addr_equal(&mc_lst->addr, addr)) {
265 struct net_device *dev;
266
267 *lnk = mc_lst->next;
268 write_unlock_bh(&ipv6_sk_mc_lock);
269
b8ad0cbc
DL		 270 dev = dev_get_by_index(net, mc_lst->ifindex);
271 if (dev != NULL) {
1da177e4
LT		 272 struct inet6_dev *idev = in6_dev_get(dev);
273
acd6e00b 274 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 275 if (idev) {
1da177e4
LT		 276 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
277 in6_dev_put(idev);
278 }
279 dev_put(dev);
acd6e00b
DS		 280 } else
281 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 282 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
283 return 0;
284 }
285 }
286 write_unlock_bh(&ipv6_sk_mc_lock);
287
9951f036 288 return -EADDRNOTAVAIL;
1da177e4
LT		 289}
290
b8ad0cbc
DL		 291static struct inet6_dev *ip6_mc_find_dev(struct net *net,
292 struct in6_addr *group,
293 int ifindex)
1da177e4
LT		 294{
295 struct net_device *dev = NULL;
296 struct inet6_dev *idev = NULL;
297
298 if (ifindex == 0) {
299 struct rt6_info *rt;
300
b8ad0cbc 301 rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4
LT		 302 if (rt) {
303 dev = rt->rt6i_dev;
304 dev_hold(dev);
305 dst_release(&rt->u.dst);
306 }
307 } else
b8ad0cbc 308 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 309
310 if (!dev)
311 return NULL;
312 idev = in6_dev_get(dev);
313 if (!idev) {
314 dev_put(dev);
315 return NULL;
316 }
317 read_lock_bh(&idev->lock);
318 if (idev->dead) {
319 read_unlock_bh(&idev->lock);
320 in6_dev_put(idev);
321 dev_put(dev);
322 return NULL;
323 }
324 return idev;
325}
326
327void ipv6_sock_mc_close(struct sock *sk)
328{
329 struct ipv6_pinfo *np = inet6_sk(sk);
330 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 331 struct net *net = sock_net(sk);
1da177e4
LT		 332
333 write_lock_bh(&ipv6_sk_mc_lock);
334 while ((mc_lst = np->ipv6_mc_list) != NULL) {
335 struct net_device *dev;
336
337 np->ipv6_mc_list = mc_lst->next;
338 write_unlock_bh(&ipv6_sk_mc_lock);
339
b8ad0cbc 340 dev = dev_get_by_index(net, mc_lst->ifindex);
1da177e4
LT		 341 if (dev) {
342 struct inet6_dev *idev = in6_dev_get(dev);
343
acd6e00b 344 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 345 if (idev) {
1da177e4
LT		 346 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
347 in6_dev_put(idev);
348 }
349 dev_put(dev);
acd6e00b
DS		 350 } else
351 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 352
353 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
354
355 write_lock_bh(&ipv6_sk_mc_lock);
356 }
357 write_unlock_bh(&ipv6_sk_mc_lock);
358}
359
360int ip6_mc_source(int add, int omode, struct sock *sk,
361 struct group_source_req *pgsr)
362{
363 struct in6_addr *source, *group;
364 struct ipv6_mc_socklist *pmc;
365 struct net_device *dev;
366 struct inet6_dev *idev;
367 struct ipv6_pinfo *inet6 = inet6_sk(sk);
368 struct ip6_sf_socklist *psl;
3b1e0a65 369 struct net *net = sock_net(sk);
1da177e4 370 int i, j, rv;
c9e3e8b6 371 int leavegroup = 0;
5ab4a6c8 372 int pmclocked = 0;
1da177e4
LT		 373 int err;
374
375 if (pgsr->gsr_group.ss_family != AF_INET6 ||
376 pgsr->gsr_source.ss_family != AF_INET6)
377 return -EINVAL;
378
379 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
380 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
381
382 if (!ipv6_addr_is_multicast(group))
383 return -EINVAL;
384
b8ad0cbc 385 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
1da177e4
LT		 386 if (!idev)
387 return -ENODEV;
388 dev = idev->dev;
389
390 err = -EADDRNOTAVAIL;
391
c9e3e8b6 392 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 393 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
394 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
395 continue;
396 if (ipv6_addr_equal(&pmc->addr, group))
397 break;
398 }
917f2f10
DS		 399 if (!pmc) { /* must have a prior join */
400 err = -EINVAL;
1da177e4 401 goto done;
917f2f10 402 }
1da177e4
LT		 403 /* if a source filter was set, must be the same mode as before */
404 if (pmc->sflist) {
917f2f10
DS		 405 if (pmc->sfmode != omode) {
406 err = -EINVAL;
1da177e4 407 goto done;
917f2f10 408 }
1da177e4
LT		 409 } else if (pmc->sfmode != omode) {
410 /* allow mode switches for empty-set filters */
411 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
412 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
413 pmc->sfmode = omode;
414 }
415
5ab4a6c8
DS		 416 write_lock_bh(&pmc->sflock);
417 pmclocked = 1;
418
1da177e4
LT		 419 psl = pmc->sflist;
420 if (!add) {
421 if (!psl)
917f2f10 422 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 423 rv = !0;
424 for (i=0; i<psl->sl_count; i++) {
425 rv = memcmp(&psl->sl_addr[i], source,
426 sizeof(struct in6_addr));
427 if (rv == 0)
428 break;
429 }
430 if (rv) /* source not found */
917f2f10 431 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 432
c9e3e8b6
DS		 433 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
434 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
435 leavegroup = 1;
436 goto done;
437 }
438
1da177e4
LT		 439 /* update the interface filter */
440 ip6_mc_del_src(idev, group, omode, 1, source, 1);
441
442 for (j=i+1; j<psl->sl_count; j++)
443 psl->sl_addr[j-1] = psl->sl_addr[j];
444 psl->sl_count--;
445 err = 0;
446 goto done;
447 }
448 /* else, add a new source to the filter */
449
450 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
451 err = -ENOBUFS;
452 goto done;
453 }
454 if (!psl || psl->sl_count == psl->sl_max) {
455 struct ip6_sf_socklist *newpsl;
456 int count = IP6_SFBLOCK;
457
458 if (psl)
459 count += psl->sl_max;
8b3a7005 460 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 461 if (!newpsl) {
462 err = -ENOBUFS;
463 goto done;
464 }
465 newpsl->sl_max = count;
466 newpsl->sl_count = count - IP6_SFBLOCK;
467 if (psl) {
468 for (i=0; i<psl->sl_count; i++)
469 newpsl->sl_addr[i] = psl->sl_addr[i];
470 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
471 }
472 pmc->sflist = psl = newpsl;
473 }
474 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
475 for (i=0; i<psl->sl_count; i++) {
476 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
477 if (rv == 0)
478 break;
479 }
480 if (rv == 0) /* address already there is an error */
481 goto done;
482 for (j=psl->sl_count-1; j>=i; j--)
483 psl->sl_addr[j+1] = psl->sl_addr[j];
484 psl->sl_addr[i] = *source;
485 psl->sl_count++;
486 err = 0;
487 /* update the interface list */
488 ip6_mc_add_src(idev, group, omode, 1, source, 1);
489done:
5ab4a6c8
DS		 490 if (pmclocked)
491 write_unlock_bh(&pmc->sflock);
c9e3e8b6 492 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 493 read_unlock_bh(&idev->lock);
494 in6_dev_put(idev);
495 dev_put(dev);
c9e3e8b6
DS		 496 if (leavegroup)
497 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 498 return err;
499}
500
501int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
502{
503 struct in6_addr *group;
504 struct ipv6_mc_socklist *pmc;
505 struct net_device *dev;
506 struct inet6_dev *idev;
507 struct ipv6_pinfo *inet6 = inet6_sk(sk);
508 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 509 struct net *net = sock_net(sk);
9951f036 510 int leavegroup = 0;
1da177e4
LT		 511 int i, err;
512
513 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
514
515 if (!ipv6_addr_is_multicast(group))
516 return -EINVAL;
517 if (gsf->gf_fmode != MCAST_INCLUDE &&
518 gsf->gf_fmode != MCAST_EXCLUDE)
519 return -EINVAL;
520
b8ad0cbc 521 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 522
523 if (!idev)
524 return -ENODEV;
525 dev = idev->dev;
1da177e4 526
9c05989b 527 err = 0;
5ab4a6c8
DS		 528 read_lock_bh(&ipv6_sk_mc_lock);
529
9951f036
DS		 530 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
531 leavegroup = 1;
532 goto done;
533 }
534
1da177e4
LT		 535 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
536 if (pmc->ifindex != gsf->gf_interface)
537 continue;
538 if (ipv6_addr_equal(&pmc->addr, group))
539 break;
540 }
917f2f10
DS		 541 if (!pmc) { /* must have a prior join */
542 err = -EINVAL;
1da177e4 543 goto done;
917f2f10 544 }
1da177e4 545 if (gsf->gf_numsrc) {
8b3a7005
KK		 546 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
547 GFP_ATOMIC);
1da177e4
LT		 548 if (!newpsl) {
549 err = -ENOBUFS;
550 goto done;
551 }
552 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
553 for (i=0; i<newpsl->sl_count; ++i) {
554 struct sockaddr_in6 *psin6;
555
556 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
557 newpsl->sl_addr[i] = psin6->sin6_addr;
558 }
559 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
560 newpsl->sl_count, newpsl->sl_addr, 0);
561 if (err) {
562 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
563 goto done;
564 }
8713dbf0 565 } else {
1da177e4 566 newpsl = NULL;
8713dbf0
YZ		 567 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
568 }
5ab4a6c8
DS		 569
570 write_lock_bh(&pmc->sflock);
1da177e4
LT		 571 psl = pmc->sflist;
572 if (psl) {
573 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
574 psl->sl_count, psl->sl_addr, 0);
575 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
576 } else
577 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
578 pmc->sflist = newpsl;
579 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 580 write_unlock_bh(&pmc->sflock);
917f2f10 581 err = 0;
1da177e4 582done:
5ab4a6c8 583 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 584 read_unlock_bh(&idev->lock);
585 in6_dev_put(idev);
586 dev_put(dev);
9951f036
DS		 587 if (leavegroup)
588 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 589 return err;
590}
591
592int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
593 struct group_filter __user *optval, int __user *optlen)
594{
595 int err, i, count, copycount;
596 struct in6_addr *group;
597 struct ipv6_mc_socklist *pmc;
598 struct inet6_dev *idev;
599 struct net_device *dev;
600 struct ipv6_pinfo *inet6 = inet6_sk(sk);
601 struct ip6_sf_socklist *psl;
3b1e0a65 602 struct net *net = sock_net(sk);
1da177e4
LT		 603
604 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
605
606 if (!ipv6_addr_is_multicast(group))
607 return -EINVAL;
608
b8ad0cbc 609 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 610
611 if (!idev)
612 return -ENODEV;
613
614 dev = idev->dev;
615
616 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 617 /*
618 * changes to the ipv6_mc_list require the socket lock and
619 * a read lock on ip6_sk_mc_lock. We have the socket lock,
620 * so reading the list is safe.
621 */
1da177e4
LT		 622
623 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
624 if (pmc->ifindex != gsf->gf_interface)
625 continue;
626 if (ipv6_addr_equal(group, &pmc->addr))
627 break;
628 }
629 if (!pmc) /* must have a prior join */
630 goto done;
631 gsf->gf_fmode = pmc->sfmode;
632 psl = pmc->sflist;
633 count = psl ? psl->sl_count : 0;
634 read_unlock_bh(&idev->lock);
635 in6_dev_put(idev);
636 dev_put(dev);
637
638 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
639 gsf->gf_numsrc = count;
640 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
641 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
642 return -EFAULT;
643 }
5ab4a6c8
DS		 644 /* changes to psl require the socket lock, a read lock on
645 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
646 * have the socket lock, so reading here is safe.
647 */
1da177e4
LT		 648 for (i=0; i<copycount; i++) {
649 struct sockaddr_in6 *psin6;
650 struct sockaddr_storage ss;
651
652 psin6 = (struct sockaddr_in6 *)&ss;
653 memset(&ss, 0, sizeof(ss));
654 psin6->sin6_family = AF_INET6;
655 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 656 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 657 return -EFAULT;
658 }
659 return 0;
660done:
661 read_unlock_bh(&idev->lock);
662 in6_dev_put(idev);
663 dev_put(dev);
664 return err;
665}
666
667int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
668 struct in6_addr *src_addr)
669{
670 struct ipv6_pinfo *np = inet6_sk(sk);
671 struct ipv6_mc_socklist *mc;
672 struct ip6_sf_socklist *psl;
673 int rv = 1;
674
675 read_lock(&ipv6_sk_mc_lock);
676 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
677 if (ipv6_addr_equal(&mc->addr, mc_addr))
678 break;
679 }
680 if (!mc) {
681 read_unlock(&ipv6_sk_mc_lock);
682 return 1;
683 }
5ab4a6c8 684 read_lock(&mc->sflock);
1da177e4
LT		 685 psl = mc->sflist;
686 if (!psl) {
687 rv = mc->sfmode == MCAST_EXCLUDE;
688 } else {
689 int i;
690
691 for (i=0; i<psl->sl_count; i++) {
692 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
693 break;
694 }
695 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
696 rv = 0;
697 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
698 rv = 0;
699 }
5ab4a6c8 700 read_unlock(&mc->sflock);
1da177e4
LT		 701 read_unlock(&ipv6_sk_mc_lock);
702
703 return rv;
704}
705
706static void ma_put(struct ifmcaddr6 *mc)
707{
708 if (atomic_dec_and_test(&mc->mca_refcnt)) {
709 in6_dev_put(mc->idev);
710 kfree(mc);
711 }
712}
713
714static void igmp6_group_added(struct ifmcaddr6 *mc)
715{
716 struct net_device *dev = mc->idev->dev;
717 char buf[MAX_ADDR_LEN];
718
719 spin_lock_bh(&mc->mca_lock);
720 if (!(mc->mca_flags&MAF_LOADED)) {
721 mc->mca_flags |= MAF_LOADED;
722 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
723 dev_mc_add(dev, buf, dev->addr_len, 0);
724 }
725 spin_unlock_bh(&mc->mca_lock);
726
727 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
728 return;
729
730 if (MLD_V1_SEEN(mc->idev)) {
731 igmp6_join_group(mc);
732 return;
733 }
734 /* else v2 */
735
736 mc->mca_crcount = mc->idev->mc_qrv;
737 mld_ifc_event(mc->idev);
738}
739
740static void igmp6_group_dropped(struct ifmcaddr6 *mc)
741{
742 struct net_device *dev = mc->idev->dev;
743 char buf[MAX_ADDR_LEN];
744
745 spin_lock_bh(&mc->mca_lock);
746 if (mc->mca_flags&MAF_LOADED) {
747 mc->mca_flags &= ~MAF_LOADED;
748 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
749 dev_mc_delete(dev, buf, dev->addr_len, 0);
750 }
751
752 if (mc->mca_flags & MAF_NOREPORT)
753 goto done;
754 spin_unlock_bh(&mc->mca_lock);
755
756 if (!mc->idev->dead)
757 igmp6_leave_group(mc);
758
759 spin_lock_bh(&mc->mca_lock);
760 if (del_timer(&mc->mca_timer))
761 atomic_dec(&mc->mca_refcnt);
762done:
763 ip6_mc_clear_src(mc);
764 spin_unlock_bh(&mc->mca_lock);
765}
766
767/*
768 * deleted ifmcaddr6 manipulation
769 */
770static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
771{
772 struct ifmcaddr6 *pmc;
773
774 /* this is an "ifmcaddr6" for convenience; only the fields below
775 * are actually used. In particular, the refcnt and users are not
776 * used for management of the delete list. Using the same structure
777 * for deleted items allows change reports to use common code with
778 * non-deleted or query-response MCA's.
779 */
0c600eda 780 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 781 if (!pmc)
782 return;
0c600eda 783
1da177e4
LT		 784 spin_lock_bh(&im->mca_lock);
785 spin_lock_init(&pmc->mca_lock);
786 pmc->idev = im->idev;
787 in6_dev_hold(idev);
788 pmc->mca_addr = im->mca_addr;
789 pmc->mca_crcount = idev->mc_qrv;
790 pmc->mca_sfmode = im->mca_sfmode;
791 if (pmc->mca_sfmode == MCAST_INCLUDE) {
792 struct ip6_sf_list *psf;
793
794 pmc->mca_tomb = im->mca_tomb;
795 pmc->mca_sources = im->mca_sources;
796 im->mca_tomb = im->mca_sources = NULL;
797 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
798 psf->sf_crcount = pmc->mca_crcount;
799 }
800 spin_unlock_bh(&im->mca_lock);
801
802 write_lock_bh(&idev->mc_lock);
803 pmc->next = idev->mc_tomb;
804 idev->mc_tomb = pmc;
805 write_unlock_bh(&idev->mc_lock);
806}
807
808static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
809{
810 struct ifmcaddr6 *pmc, *pmc_prev;
811 struct ip6_sf_list *psf, *psf_next;
812
813 write_lock_bh(&idev->mc_lock);
814 pmc_prev = NULL;
815 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
816 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
817 break;
818 pmc_prev = pmc;
819 }
820 if (pmc) {
821 if (pmc_prev)
822 pmc_prev->next = pmc->next;
823 else
824 idev->mc_tomb = pmc->next;
825 }
826 write_unlock_bh(&idev->mc_lock);
827 if (pmc) {
828 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
829 psf_next = psf->sf_next;
830 kfree(psf);
831 }
832 in6_dev_put(pmc->idev);
833 kfree(pmc);
834 }
835}
836
837static void mld_clear_delrec(struct inet6_dev *idev)
838{
839 struct ifmcaddr6 *pmc, *nextpmc;
840
841 write_lock_bh(&idev->mc_lock);
842 pmc = idev->mc_tomb;
843 idev->mc_tomb = NULL;
844 write_unlock_bh(&idev->mc_lock);
845
846 for (; pmc; pmc = nextpmc) {
847 nextpmc = pmc->next;
848 ip6_mc_clear_src(pmc);
849 in6_dev_put(pmc->idev);
850 kfree(pmc);
851 }
852
853 /* clear dead sources, too */
854 read_lock_bh(&idev->lock);
855 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
856 struct ip6_sf_list *psf, *psf_next;
857
858 spin_lock_bh(&pmc->mca_lock);
859 psf = pmc->mca_tomb;
860 pmc->mca_tomb = NULL;
861 spin_unlock_bh(&pmc->mca_lock);
862 for (; psf; psf=psf_next) {
863 psf_next = psf->sf_next;
864 kfree(psf);
865 }
866 }
867 read_unlock_bh(&idev->lock);
868}
869
870
871/*
872 * device multicast group inc (add if not found)
873 */
874int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
875{
876 struct ifmcaddr6 *mc;
877 struct inet6_dev *idev;
878
879 idev = in6_dev_get(dev);
880
881 if (idev == NULL)
882 return -EINVAL;
883
884 write_lock_bh(&idev->lock);
885 if (idev->dead) {
886 write_unlock_bh(&idev->lock);
887 in6_dev_put(idev);
888 return -ENODEV;
889 }
890
891 for (mc = idev->mc_list; mc; mc = mc->next) {
892 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
893 mc->mca_users++;
894 write_unlock_bh(&idev->lock);
895 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
896 NULL, 0);
897 in6_dev_put(idev);
898 return 0;
899 }
900 }
901
902 /*
903 * not found: create a new one.
904 */
905
0c600eda 906 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 907
908 if (mc == NULL) {
909 write_unlock_bh(&idev->lock);
910 in6_dev_put(idev);
911 return -ENOMEM;
912 }
913
b24b8a24 914 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4
LT		 915
916 ipv6_addr_copy(&mc->mca_addr, addr);
917 mc->idev = idev;
918 mc->mca_users = 1;
919 /* mca_stamp should be updated upon changes */
920 mc->mca_cstamp = mc->mca_tstamp = jiffies;
921 atomic_set(&mc->mca_refcnt, 2);
922 spin_lock_init(&mc->mca_lock);
923
924 /* initial mode is (EX, empty) */
925 mc->mca_sfmode = MCAST_EXCLUDE;
926 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
927
928 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
929 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
930 mc->mca_flags |= MAF_NOREPORT;
931
932 mc->next = idev->mc_list;
933 idev->mc_list = mc;
934 write_unlock_bh(&idev->lock);
935
936 mld_del_delrec(idev, &mc->mca_addr);
937 igmp6_group_added(mc);
938 ma_put(mc);
939 return 0;
940}
941
942/*
943 * device multicast group del
944 */
945int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
946{
947 struct ifmcaddr6 *ma, **map;
948
949 write_lock_bh(&idev->lock);
950 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
951 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
952 if (--ma->mca_users == 0) {
953 *map = ma->next;
954 write_unlock_bh(&idev->lock);
955
956 igmp6_group_dropped(ma);
957
958 ma_put(ma);
959 return 0;
960 }
961 write_unlock_bh(&idev->lock);
962 return 0;
963 }
964 }
965 write_unlock_bh(&idev->lock);
966
967 return -ENOENT;
968}
969
970int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
971{
972 struct inet6_dev *idev = in6_dev_get(dev);
973 int err;
974
975 if (!idev)
976 return -ENODEV;
977
978 err = __ipv6_dev_mc_dec(idev, addr);
979
980 in6_dev_put(idev);
981
982 return err;
983}
984
985/*
986 * identify MLD packets for MLD filter exceptions
987 */
988int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
989{
990 struct icmp6hdr *pic;
991
992 if (nexthdr != IPPROTO_ICMPV6)
993 return 0;
994
995 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
996 return 0;
997
cc70ab26 998 pic = icmp6_hdr(skb);
1da177e4
LT		 999
1000 switch (pic->icmp6_type) {
1001 case ICMPV6_MGM_QUERY:
1002 case ICMPV6_MGM_REPORT:
1003 case ICMPV6_MGM_REDUCTION:
1004 case ICMPV6_MLD2_REPORT:
1005 return 1;
1006 default:
1007 break;
1008 }
1009 return 0;
1010}
1011
1012/*
1013 * check if the interface/address pair is valid
1014 */
1015int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1016 struct in6_addr *src_addr)
1017{
1018 struct inet6_dev *idev;
1019 struct ifmcaddr6 *mc;
1020 int rv = 0;
1021
1022 idev = in6_dev_get(dev);
1023 if (idev) {
1024 read_lock_bh(&idev->lock);
1025 for (mc = idev->mc_list; mc; mc=mc->next) {
1026 if (ipv6_addr_equal(&mc->mca_addr, group))
1027 break;
1028 }
1029 if (mc) {
1030 if (src_addr && !ipv6_addr_any(src_addr)) {
1031 struct ip6_sf_list *psf;
1032
1033 spin_lock_bh(&mc->mca_lock);
1034 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1035 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1036 break;
1037 }
1038 if (psf)
1039 rv = psf->sf_count[MCAST_INCLUDE] ||
1040 psf->sf_count[MCAST_EXCLUDE] !=
1041 mc->mca_sfcount[MCAST_EXCLUDE];
1042 else
1043 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1044 spin_unlock_bh(&mc->mca_lock);
1045 } else
1046 rv = 1; /* don't filter unspecified source */
1047 }
1048 read_unlock_bh(&idev->lock);
1049 in6_dev_put(idev);
1050 }
1051 return rv;
1052}
1053
1054static void mld_gq_start_timer(struct inet6_dev *idev)
1055{
1056 int tv = net_random() % idev->mc_maxdelay;
1057
1058 idev->mc_gq_running = 1;
1059 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1060 in6_dev_hold(idev);
1061}
1062
1063static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1064{
1065 int tv = net_random() % delay;
1066
1067 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1068 in6_dev_hold(idev);
1069}
1070
1071/*
1072 * IGMP handling (alias multicast ICMPv6 messages)
1073 */
1074
1075static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1076{
1077 unsigned long delay = resptime;
1078
1079 /* Do not start timer for these addresses */
1080 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1081 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1082 return;
1083
1084 if (del_timer(&ma->mca_timer)) {
1085 atomic_dec(&ma->mca_refcnt);
1086 delay = ma->mca_timer.expires - jiffies;
1087 }
1088
1089 if (delay >= resptime) {
1090 if (resptime)
1091 delay = net_random() % resptime;
1092 else
1093 delay = 1;
1094 }
1095 ma->mca_timer.expires = jiffies + delay;
1096 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1097 atomic_inc(&ma->mca_refcnt);
1098 ma->mca_flags |= MAF_TIMER_RUNNING;
1099}
1100
5ab4a6c8
DS		 1101/* mark EXCLUDE-mode sources */
1102static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1103 struct in6_addr *srcs)
1104{
1105 struct ip6_sf_list *psf;
1106 int i, scount;
1107
1108 scount = 0;
1109 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1110 if (scount == nsrcs)
1111 break;
5ab4a6c8
DS		 1112 for (i=0; i<nsrcs; i++) {
1113 /* skip inactive filters */
1114 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1115 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1116 psf->sf_count[MCAST_EXCLUDE])
1117 continue;
1118 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1119 scount++;
1120 break;
1121 }
1122 }
1123 }
1124 pmc->mca_flags &= ~MAF_GSQUERY;
1125 if (scount == nsrcs) /* all sources excluded */
1126 return 0;
1127 return 1;
1128}
1129
1130static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1131 struct in6_addr *srcs)
1132{
1133 struct ip6_sf_list *psf;
1134 int i, scount;
1135
1136 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1137 return mld_xmarksources(pmc, nsrcs, srcs);
1138
1139 /* mark INCLUDE-mode sources */
1140
1141 scount = 0;
1142 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1143 if (scount == nsrcs)
1144 break;
1145 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1146 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1147 psf->sf_gsresp = 1;
1148 scount++;
1149 break;
1150 }
5ab4a6c8
DS		 1151 }
1152 }
1153 if (!scount) {
1154 pmc->mca_flags &= ~MAF_GSQUERY;
1155 return 0;
1da177e4 1156 }
5ab4a6c8
DS		 1157 pmc->mca_flags |= MAF_GSQUERY;
1158 return 1;
1da177e4
LT		 1159}
1160
1161int igmp6_event_query(struct sk_buff *skb)
1162{
97300b5f 1163 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1164 struct ifmcaddr6 *ma;
1165 struct in6_addr *group;
1166 unsigned long max_delay;
1167 struct inet6_dev *idev;
1168 struct icmp6hdr *hdr;
1169 int group_type;
1170 int mark = 0;
1171 int len;
1172
1173 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1174 return -EINVAL;
1175
1176 /* compute payload length excluding extension headers */
0660e03f 1177 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1178 len -= skb_network_header_len(skb);
1da177e4
LT		 1179
1180 /* Drop queries with not link local source */
0660e03f 1181 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1182 return -EINVAL;
1183
1184 idev = in6_dev_get(skb->dev);
1185
1186 if (idev == NULL)
1187 return 0;
1188
cc70ab26 1189 hdr = icmp6_hdr(skb);
1da177e4
LT		 1190 group = (struct in6_addr *) (hdr + 1);
1191 group_type = ipv6_addr_type(group);
1192
1193 if (group_type != IPV6_ADDR_ANY &&
1194 !(group_type&IPV6_ADDR_MULTICAST)) {
1195 in6_dev_put(idev);
1196 return -EINVAL;
1197 }
1198
1199 if (len == 24) {
1200 int switchback;
1201 /* MLDv1 router present */
1202
1203 /* Translate milliseconds to jiffies */
1204 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1205
1206 switchback = (idev->mc_qrv + 1) * max_delay;
1207 idev->mc_v1_seen = jiffies + switchback;
1208
1209 /* cancel the interface change timer */
1210 idev->mc_ifc_count = 0;
1211 if (del_timer(&idev->mc_ifc_timer))
1212 __in6_dev_put(idev);
1213 /* clear deleted report items */
1214 mld_clear_delrec(idev);
1215 } else if (len >= 28) {
1ab1457c 1216 int srcs_offset = sizeof(struct mld2_query) -
97300b5f
YZ		 1217 sizeof(struct icmp6hdr);
1218 if (!pskb_may_pull(skb, srcs_offset)) {
1219 in6_dev_put(idev);
1220 return -EINVAL;
1221 }
9c70220b 1222 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1da177e4
LT		 1223 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1224 if (!max_delay)
1225 max_delay = 1;
1226 idev->mc_maxdelay = max_delay;
1227 if (mlh2->qrv)
1228 idev->mc_qrv = mlh2->qrv;
1229 if (group_type == IPV6_ADDR_ANY) { /* general query */
1230 if (mlh2->nsrcs) {
1231 in6_dev_put(idev);
1232 return -EINVAL; /* no sources allowed */
1233 }
1234 mld_gq_start_timer(idev);
1235 in6_dev_put(idev);
1236 return 0;
1237 }
1238 /* mark sources to include, if group & source-specific */
97300b5f 1239 if (mlh2->nsrcs != 0) {
1ab1457c 1240 if (!pskb_may_pull(skb, srcs_offset +
5ab4a6c8 1241 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1242 in6_dev_put(idev);
1243 return -EINVAL;
1244 }
9c70220b 1245 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1246 mark = 1;
1247 }
1da177e4
LT		 1248 } else {
1249 in6_dev_put(idev);
1250 return -EINVAL;
1251 }
1252
1253 read_lock_bh(&idev->lock);
1254 if (group_type == IPV6_ADDR_ANY) {
1255 for (ma = idev->mc_list; ma; ma=ma->next) {
1256 spin_lock_bh(&ma->mca_lock);
1257 igmp6_group_queried(ma, max_delay);
1258 spin_unlock_bh(&ma->mca_lock);
1259 }
1260 } else {
1261 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1262 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1263 continue;
1264 spin_lock_bh(&ma->mca_lock);
1265 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1266 /* gsquery <- gsquery && mark */
1267 if (!mark)
1268 ma->mca_flags &= ~MAF_GSQUERY;
1269 } else {
1270 /* gsquery <- mark */
1271 if (mark)
1272 ma->mca_flags |= MAF_GSQUERY;
1273 else
1274 ma->mca_flags &= ~MAF_GSQUERY;
1275 }
5ab4a6c8 1276 if (!(ma->mca_flags & MAF_GSQUERY) ||
7add2a43 1277 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
5ab4a6c8 1278 igmp6_group_queried(ma, max_delay);
1da177e4 1279 spin_unlock_bh(&ma->mca_lock);
7add2a43 1280 break;
1da177e4
LT		 1281 }
1282 }
1283 read_unlock_bh(&idev->lock);
1284 in6_dev_put(idev);
1285
1286 return 0;
1287}
1288
1289
1290int igmp6_event_report(struct sk_buff *skb)
1291{
1292 struct ifmcaddr6 *ma;
1293 struct in6_addr *addrp;
1294 struct inet6_dev *idev;
1295 struct icmp6hdr *hdr;
1296 int addr_type;
1297
1298 /* Our own report looped back. Ignore it. */
1299 if (skb->pkt_type == PACKET_LOOPBACK)
1300 return 0;
1301
24c69275
DS		 1302 /* send our report if the MC router may not have heard this report */
1303 if (skb->pkt_type != PACKET_MULTICAST &&
1304 skb->pkt_type != PACKET_BROADCAST)
1305 return 0;
1306
1da177e4
LT		 1307 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1308 return -EINVAL;
1309
cc70ab26 1310 hdr = icmp6_hdr(skb);
1da177e4
LT		 1311
1312 /* Drop reports with not link local source */
0660e03f 1313 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1314 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1315 !(addr_type&IPV6_ADDR_LINKLOCAL))
1316 return -EINVAL;
1317
1318 addrp = (struct in6_addr *) (hdr + 1);
1319
1320 idev = in6_dev_get(skb->dev);
1321 if (idev == NULL)
1322 return -ENODEV;
1323
1324 /*
1325 * Cancel the timer for this group
1326 */
1327
1328 read_lock_bh(&idev->lock);
1329 for (ma = idev->mc_list; ma; ma=ma->next) {
1330 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1331 spin_lock(&ma->mca_lock);
1332 if (del_timer(&ma->mca_timer))
1333 atomic_dec(&ma->mca_refcnt);
1334 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1335 spin_unlock(&ma->mca_lock);
1336 break;
1337 }
1338 }
1339 read_unlock_bh(&idev->lock);
1340 in6_dev_put(idev);
1341 return 0;
1342}
1343
1344static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1345 int gdeleted, int sdeleted)
1346{
1347 switch (type) {
1348 case MLD2_MODE_IS_INCLUDE:
1349 case MLD2_MODE_IS_EXCLUDE:
1350 if (gdeleted || sdeleted)
1351 return 0;
5ab4a6c8
DS		 1352 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1353 if (pmc->mca_sfmode == MCAST_INCLUDE)
1354 return 1;
1355 /* don't include if this source is excluded
1356 * in all filters
1357 */
1358 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1359 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1360 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1361 psf->sf_count[MCAST_EXCLUDE];
1362 }
1363 return 0;
1da177e4
LT		 1364 case MLD2_CHANGE_TO_INCLUDE:
1365 if (gdeleted || sdeleted)
1366 return 0;
1367 return psf->sf_count[MCAST_INCLUDE] != 0;
1368 case MLD2_CHANGE_TO_EXCLUDE:
1369 if (gdeleted || sdeleted)
1370 return 0;
1371 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1372 psf->sf_count[MCAST_INCLUDE])
1373 return 0;
1374 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1375 psf->sf_count[MCAST_EXCLUDE];
1376 case MLD2_ALLOW_NEW_SOURCES:
1377 if (gdeleted || !psf->sf_crcount)
1378 return 0;
1379 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1380 case MLD2_BLOCK_OLD_SOURCES:
1381 if (pmc->mca_sfmode == MCAST_INCLUDE)
1382 return gdeleted || (psf->sf_crcount && sdeleted);
1383 return psf->sf_crcount && !gdeleted && !sdeleted;
1384 }
1385 return 0;
1386}
1387
1388static int
1389mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1390{
1391 struct ip6_sf_list *psf;
1392 int scount = 0;
1393
1394 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1395 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1396 continue;
1397 scount++;
1398 }
1399 return scount;
1400}
1401
1402static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1403{
c346dca1 1404 struct net *net = dev_net(dev);
b8ad0cbc 1405 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1406 struct sk_buff *skb;
1407 struct mld2_report *pmr;
1408 struct in6_addr addr_buf;
1409 int err;
1410 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1411 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1412 IPV6_TLV_PADN, 0 };
1413
1414 /* we assume size > sizeof(ra) here */
1415 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1416
cfcabdcc 1417 if (!skb)
1da177e4
LT		 1418 return NULL;
1419
1420 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1421
95c385b4 1422 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1423 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1424 * use unspecified address as the source address
1da177e4
LT		 1425 * when a valid link-local address is not available.
1426 */
1427 memset(&addr_buf, 0, sizeof(addr_buf));
1428 }
1429
1430 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1431
1432 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1433
27a884dc 1434 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1435 skb_put(skb, sizeof(*pmr));
1436 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1437 pmr->type = ICMPV6_MLD2_REPORT;
1438 pmr->resv1 = 0;
1439 pmr->csum = 0;
1440 pmr->resv2 = 0;
1441 pmr->ngrec = 0;
1442 return skb;
1443}
1444
1445static void mld_sendpack(struct sk_buff *skb)
1446{
0660e03f 1447 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1448 struct mld2_report *pmr =
1449 (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1450 int payload_len, mldlen;
1451 struct inet6_dev *idev = in6_dev_get(skb->dev);
c346dca1 1452 struct net *net = dev_net(skb->dev);
1da177e4 1453 int err;
41927178 1454 struct flowi fl;
1da177e4 1455
a11d206d 1456 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
27a884dc
ACM		 1457 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1458 mldlen = skb->tail - skb->transport_header;
1da177e4
LT		 1459 pip6->payload_len = htons(payload_len);
1460
1461 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
9c70220b
ACM		 1462 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1463 mldlen, 0));
41927178
YH		 1464
1465 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1466
1467 if (!skb->dst) {
1468 err = -ENOMEM;
1469 goto err_out;
1470 }
1471
b8ad0cbc 1472 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
41927178
YH		 1473 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1474 skb->dev->ifindex);
1475
1476 err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1477 if (err)
1478 goto err_out;
1479
6e23ae2a 1480 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1481 dst_output);
1482out:
1da177e4 1483 if (!err) {
14878f75
DS		 1484 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1485 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1486 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1da177e4 1487 } else
14878f75 1488 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1489
1490 if (likely(idev != NULL))
1491 in6_dev_put(idev);
41927178
YH		 1492 return;
1493
1494err_out:
1495 kfree_skb(skb);
1496 goto out;
1da177e4
LT		 1497}
1498
1499static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1500{
fab10fe3 1501 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1502}
1503
1504static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1505 int type, struct mld2_grec **ppgr)
1506{
1507 struct net_device *dev = pmc->idev->dev;
1508 struct mld2_report *pmr;
1509 struct mld2_grec *pgr;
1510
1511 if (!skb)
1512 skb = mld_newpack(dev, dev->mtu);
1513 if (!skb)
1514 return NULL;
1515 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1516 pgr->grec_type = type;
1517 pgr->grec_auxwords = 0;
1518 pgr->grec_nsrcs = 0;
1519 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1520 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1521 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1522 *ppgr = pgr;
1523 return skb;
1524}
1525
1526#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1527 skb_tailroom(skb)) : 0)
1528
1529static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1530 int type, int gdeleted, int sdeleted)
1531{
1532 struct net_device *dev = pmc->idev->dev;
1533 struct mld2_report *pmr;
1534 struct mld2_grec *pgr = NULL;
1535 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1536 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1537
1538 if (pmc->mca_flags & MAF_NOREPORT)
1539 return skb;
1540
1541 isquery = type == MLD2_MODE_IS_INCLUDE ||
1542 type == MLD2_MODE_IS_EXCLUDE;
1543 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1544 type == MLD2_CHANGE_TO_EXCLUDE;
1545
5ab4a6c8
DS		 1546 stotal = scount = 0;
1547
1da177e4
LT		 1548 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1549
5ab4a6c8
DS		 1550 if (!*psf_list)
1551 goto empty_source;
1552
9c70220b 1553 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1554
1555 /* EX and TO_EX get a fresh packet, if needed */
1556 if (truncate) {
1557 if (pmr && pmr->ngrec &&
1558 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1559 if (skb)
1560 mld_sendpack(skb);
1561 skb = mld_newpack(dev, dev->mtu);
1562 }
1563 }
1564 first = 1;
1da177e4
LT		 1565 psf_prev = NULL;
1566 for (psf=*psf_list; psf; psf=psf_next) {
1567 struct in6_addr *psrc;
1568
1569 psf_next = psf->sf_next;
1570
1571 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1572 psf_prev = psf;
1573 continue;
1574 }
1575
1576 /* clear marks on query responses */
1577 if (isquery)
1578 psf->sf_gsresp = 0;
1579
1580 if (AVAILABLE(skb) < sizeof(*psrc) +
1581 first*sizeof(struct mld2_grec)) {
1582 if (truncate && !first)
1583 break; /* truncate these */
1584 if (pgr)
1585 pgr->grec_nsrcs = htons(scount);
1586 if (skb)
1587 mld_sendpack(skb);
1588 skb = mld_newpack(dev, dev->mtu);
1589 first = 1;
1590 scount = 0;
1591 }
1592 if (first) {
1593 skb = add_grhead(skb, pmc, type, &pgr);
1594 first = 0;
1595 }
cc63f70b
AD		 1596 if (!skb)
1597 return NULL;
1da177e4
LT		 1598 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1599 *psrc = psf->sf_addr;
5ab4a6c8 1600 scount++; stotal++;
1da177e4
LT		 1601 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1602 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1603 psf->sf_crcount--;
1604 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1605 if (psf_prev)
1606 psf_prev->sf_next = psf->sf_next;
1607 else
1608 *psf_list = psf->sf_next;
1609 kfree(psf);
1610 continue;
1611 }
1612 }
1613 psf_prev = psf;
1614 }
5ab4a6c8
DS		 1615
1616empty_source:
1617 if (!stotal) {
1618 if (type == MLD2_ALLOW_NEW_SOURCES ||
1619 type == MLD2_BLOCK_OLD_SOURCES)
1620 return skb;
1621 if (pmc->mca_crcount || isquery) {
1622 /* make sure we have room for group header */
1623 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1624 mld_sendpack(skb);
1625 skb = NULL; /* add_grhead will get a new one */
1626 }
1627 skb = add_grhead(skb, pmc, type, &pgr);
1628 }
1629 }
1da177e4
LT		 1630 if (pgr)
1631 pgr->grec_nsrcs = htons(scount);
1632
1633 if (isquery)
1634 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1635 return skb;
1636}
1637
1638static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1639{
1640 struct sk_buff *skb = NULL;
1641 int type;
1642
1643 if (!pmc) {
1644 read_lock_bh(&idev->lock);
1645 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1646 if (pmc->mca_flags & MAF_NOREPORT)
1647 continue;
1648 spin_lock_bh(&pmc->mca_lock);
1649 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1650 type = MLD2_MODE_IS_EXCLUDE;
1651 else
1652 type = MLD2_MODE_IS_INCLUDE;
1653 skb = add_grec(skb, pmc, type, 0, 0);
1654 spin_unlock_bh(&pmc->mca_lock);
1655 }
1656 read_unlock_bh(&idev->lock);
1657 } else {
1658 spin_lock_bh(&pmc->mca_lock);
1659 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1660 type = MLD2_MODE_IS_EXCLUDE;
1661 else
1662 type = MLD2_MODE_IS_INCLUDE;
1663 skb = add_grec(skb, pmc, type, 0, 0);
1664 spin_unlock_bh(&pmc->mca_lock);
1665 }
1666 if (skb)
1667 mld_sendpack(skb);
1668}
1669
1670/*
1671 * remove zero-count source records from a source filter list
1672 */
1673static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1674{
1675 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1676
1677 psf_prev = NULL;
1678 for (psf=*ppsf; psf; psf = psf_next) {
1679 psf_next = psf->sf_next;
1680 if (psf->sf_crcount == 0) {
1681 if (psf_prev)
1682 psf_prev->sf_next = psf->sf_next;
1683 else
1684 *ppsf = psf->sf_next;
1685 kfree(psf);
1686 } else
1687 psf_prev = psf;
1688 }
1689}
1690
1691static void mld_send_cr(struct inet6_dev *idev)
1692{
1693 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1694 struct sk_buff *skb = NULL;
1695 int type, dtype;
1696
1697 read_lock_bh(&idev->lock);
1698 write_lock_bh(&idev->mc_lock);
1699
1700 /* deleted MCA's */
1701 pmc_prev = NULL;
1702 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1703 pmc_next = pmc->next;
1704 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1705 type = MLD2_BLOCK_OLD_SOURCES;
1706 dtype = MLD2_BLOCK_OLD_SOURCES;
1707 skb = add_grec(skb, pmc, type, 1, 0);
1708 skb = add_grec(skb, pmc, dtype, 1, 1);
1709 }
1710 if (pmc->mca_crcount) {
1da177e4
LT		 1711 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1712 type = MLD2_CHANGE_TO_INCLUDE;
1713 skb = add_grec(skb, pmc, type, 1, 0);
1714 }
5ab4a6c8 1715 pmc->mca_crcount--;
1da177e4
LT		 1716 if (pmc->mca_crcount == 0) {
1717 mld_clear_zeros(&pmc->mca_tomb);
1718 mld_clear_zeros(&pmc->mca_sources);
1719 }
1720 }
1721 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1722 !pmc->mca_sources) {
1723 if (pmc_prev)
1724 pmc_prev->next = pmc_next;
1725 else
1726 idev->mc_tomb = pmc_next;
1727 in6_dev_put(pmc->idev);
1728 kfree(pmc);
1729 } else
1730 pmc_prev = pmc;
1731 }
1732 write_unlock_bh(&idev->mc_lock);
1733
1734 /* change recs */
1735 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1736 spin_lock_bh(&pmc->mca_lock);
1737 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1738 type = MLD2_BLOCK_OLD_SOURCES;
1739 dtype = MLD2_ALLOW_NEW_SOURCES;
1740 } else {
1741 type = MLD2_ALLOW_NEW_SOURCES;
1742 dtype = MLD2_BLOCK_OLD_SOURCES;
1743 }
1744 skb = add_grec(skb, pmc, type, 0, 0);
1745 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1746
1747 /* filter mode changes */
1748 if (pmc->mca_crcount) {
1da177e4
LT		 1749 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1750 type = MLD2_CHANGE_TO_EXCLUDE;
1751 else
1752 type = MLD2_CHANGE_TO_INCLUDE;
1753 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1754 pmc->mca_crcount--;
1da177e4
LT		 1755 }
1756 spin_unlock_bh(&pmc->mca_lock);
1757 }
1758 read_unlock_bh(&idev->lock);
1759 if (!skb)
1760 return;
1761 (void) mld_sendpack(skb);
1762}
1763
1764static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1765{
c346dca1 1766 struct net *net = dev_net(dev);
b8ad0cbc 1767 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1768 struct inet6_dev *idev;
1ab1457c
YH		 1769 struct sk_buff *skb;
1770 struct icmp6hdr *hdr;
1da177e4
LT		 1771 struct in6_addr *snd_addr;
1772 struct in6_addr *addrp;
1773 struct in6_addr addr_buf;
1774 struct in6_addr all_routers;
1775 int err, len, payload_len, full_len;
1776 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1777 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1778 IPV6_TLV_PADN, 0 };
41927178 1779 struct flowi fl;
1da177e4 1780
a11d206d
YH		 1781 rcu_read_lock();
1782 IP6_INC_STATS(__in6_dev_get(dev),
1783 IPSTATS_MIB_OUTREQUESTS);
1784 rcu_read_unlock();
1da177e4
LT		 1785 snd_addr = addr;
1786 if (type == ICMPV6_MGM_REDUCTION) {
1787 snd_addr = &all_routers;
1788 ipv6_addr_all_routers(&all_routers);
1789 }
1790
1791 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1792 payload_len = len + sizeof(ra);
1793 full_len = sizeof(struct ipv6hdr) + payload_len;
1794
1795 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1796
1797 if (skb == NULL) {
a11d206d
YH		 1798 rcu_read_lock();
1799 IP6_INC_STATS(__in6_dev_get(dev),
1800 IPSTATS_MIB_OUTDISCARDS);
1801 rcu_read_unlock();
1da177e4
LT		 1802 return;
1803 }
1804
1805 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1806
95c385b4 1807 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1808 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1809 * use unspecified address as the source address
1da177e4
LT		 1810 * when a valid link-local address is not available.
1811 */
1812 memset(&addr_buf, 0, sizeof(addr_buf));
1813 }
1814
1815 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1816
1817 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1818
1819 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1820 memset(hdr, 0, sizeof(struct icmp6hdr));
1821 hdr->icmp6_type = type;
1822
1823 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1824 ipv6_addr_copy(addrp, addr);
1825
1826 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1827 IPPROTO_ICMPV6,
1828 csum_partial((__u8 *) hdr, len, 0));
1829
1830 idev = in6_dev_get(skb->dev);
1831
41927178
YH		 1832 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1833 if (!skb->dst) {
1834 err = -ENOMEM;
1835 goto err_out;
1836 }
1837
b8ad0cbc 1838 icmpv6_flow_init(sk, &fl, type,
41927178
YH		 1839 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1840 skb->dev->ifindex);
1841
1842 err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1843 if (err)
1844 goto err_out;
1845
6e23ae2a 1846 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1847 dst_output);
1848out:
1da177e4 1849 if (!err) {
14878f75 1850 ICMP6MSGOUT_INC_STATS(idev, type);
1da177e4 1851 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
a11d206d 1852 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1da177e4 1853 } else
a11d206d 1854 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1855
1856 if (likely(idev != NULL))
1857 in6_dev_put(idev);
1858 return;
41927178
YH		 1859
1860err_out:
1861 kfree_skb(skb);
1862 goto out;
1da177e4
LT		 1863}
1864
1865static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1866 struct in6_addr *psfsrc)
1867{
1868 struct ip6_sf_list *psf, *psf_prev;
1869 int rv = 0;
1870
1871 psf_prev = NULL;
1872 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1873 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1874 break;
1875 psf_prev = psf;
1876 }
1877 if (!psf || psf->sf_count[sfmode] == 0) {
1878 /* source filter not found, or count wrong => bug */
1879 return -ESRCH;
1880 }
1881 psf->sf_count[sfmode]--;
1882 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1883 struct inet6_dev *idev = pmc->idev;
1884
1885 /* no more filters for this source */
1886 if (psf_prev)
1887 psf_prev->sf_next = psf->sf_next;
1888 else
1889 pmc->mca_sources = psf->sf_next;
1890 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1891 !MLD_V1_SEEN(idev)) {
1892 psf->sf_crcount = idev->mc_qrv;
1893 psf->sf_next = pmc->mca_tomb;
1894 pmc->mca_tomb = psf;
1895 rv = 1;
1896 } else
1897 kfree(psf);
1898 }
1899 return rv;
1900}
1901
1902static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1903 int sfmode, int sfcount, struct in6_addr *psfsrc,
1904 int delta)
1905{
1906 struct ifmcaddr6 *pmc;
1907 int changerec = 0;
1908 int i, err;
1909
1910 if (!idev)
1911 return -ENODEV;
1912 read_lock_bh(&idev->lock);
1913 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1914 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1915 break;
1916 }
1917 if (!pmc) {
1918 /* MCA not found?? bug */
1919 read_unlock_bh(&idev->lock);
1920 return -ESRCH;
1921 }
1922 spin_lock_bh(&pmc->mca_lock);
1923 sf_markstate(pmc);
1924 if (!delta) {
1925 if (!pmc->mca_sfcount[sfmode]) {
1926 spin_unlock_bh(&pmc->mca_lock);
1927 read_unlock_bh(&idev->lock);
1928 return -EINVAL;
1929 }
1930 pmc->mca_sfcount[sfmode]--;
1931 }
1932 err = 0;
1933 for (i=0; i<sfcount; i++) {
1934 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1935
1936 changerec |= rv > 0;
1937 if (!err && rv < 0)
1938 err = rv;
1939 }
1940 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1941 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1942 pmc->mca_sfcount[MCAST_INCLUDE]) {
1943 struct ip6_sf_list *psf;
1944
1945 /* filter mode change */
1946 pmc->mca_sfmode = MCAST_INCLUDE;
1947 pmc->mca_crcount = idev->mc_qrv;
1948 idev->mc_ifc_count = pmc->mca_crcount;
1949 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1950 psf->sf_crcount = 0;
1951 mld_ifc_event(pmc->idev);
1952 } else if (sf_setstate(pmc) || changerec)
1953 mld_ifc_event(pmc->idev);
1954 spin_unlock_bh(&pmc->mca_lock);
1955 read_unlock_bh(&idev->lock);
1956 return err;
1957}
1958
1959/*
1960 * Add multicast single-source filter to the interface list
1961 */
1962static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1963 struct in6_addr *psfsrc, int delta)
1964{
1965 struct ip6_sf_list *psf, *psf_prev;
1966
1967 psf_prev = NULL;
1968 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1969 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1970 break;
1971 psf_prev = psf;
1972 }
1973 if (!psf) {
0c600eda 1974 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1975 if (!psf)
1976 return -ENOBUFS;
0c600eda 1977
1da177e4
LT		 1978 psf->sf_addr = *psfsrc;
1979 if (psf_prev) {
1980 psf_prev->sf_next = psf;
1981 } else
1982 pmc->mca_sources = psf;
1983 }
1984 psf->sf_count[sfmode]++;
1985 return 0;
1986}
1987
1988static void sf_markstate(struct ifmcaddr6 *pmc)
1989{
1990 struct ip6_sf_list *psf;
1991 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1992
1993 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1994 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1995 psf->sf_oldin = mca_xcount ==
1996 psf->sf_count[MCAST_EXCLUDE] &&
1997 !psf->sf_count[MCAST_INCLUDE];
1998 } else
1999 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2000}
2001
2002static int sf_setstate(struct ifmcaddr6 *pmc)
2003{
7add2a43 2004 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 2005 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2006 int qrv = pmc->idev->mc_qrv;
2007 int new_in, rv;
2008
2009 rv = 0;
2010 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2011 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2012 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2013 !psf->sf_count[MCAST_INCLUDE];
2014 } else
2015 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 2016 if (new_in) {
2017 if (!psf->sf_oldin) {
e80e28b6 2018 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 2019
2020 for (dpsf=pmc->mca_tomb; dpsf;
2021 dpsf=dpsf->sf_next) {
2022 if (ipv6_addr_equal(&dpsf->sf_addr,
2023 &psf->sf_addr))
2024 break;
2025 prev = dpsf;
2026 }
2027 if (dpsf) {
2028 if (prev)
2029 prev->sf_next = dpsf->sf_next;
2030 else
2031 pmc->mca_tomb = dpsf->sf_next;
2032 kfree(dpsf);
2033 }
2034 psf->sf_crcount = qrv;
2035 rv++;
2036 }
2037 } else if (psf->sf_oldin) {
2038 psf->sf_crcount = 0;
2039 /*
2040 * add or update "delete" records if an active filter
2041 * is now inactive
2042 */
2043 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2044 if (ipv6_addr_equal(&dpsf->sf_addr,
2045 &psf->sf_addr))
2046 break;
2047 if (!dpsf) {
2048 dpsf = (struct ip6_sf_list *)
2049 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2050 if (!dpsf)
2051 continue;
2052 *dpsf = *psf;
2053 /* pmc->mca_lock held by callers */
2054 dpsf->sf_next = pmc->mca_tomb;
2055 pmc->mca_tomb = dpsf;
2056 }
2057 dpsf->sf_crcount = qrv;
1da177e4
LT		 2058 rv++;
2059 }
2060 }
2061 return rv;
2062}
2063
2064/*
2065 * Add multicast source filter list to the interface list
2066 */
2067static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2068 int sfmode, int sfcount, struct in6_addr *psfsrc,
2069 int delta)
2070{
2071 struct ifmcaddr6 *pmc;
2072 int isexclude;
2073 int i, err;
2074
2075 if (!idev)
2076 return -ENODEV;
2077 read_lock_bh(&idev->lock);
2078 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2079 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2080 break;
2081 }
2082 if (!pmc) {
2083 /* MCA not found?? bug */
2084 read_unlock_bh(&idev->lock);
2085 return -ESRCH;
2086 }
2087 spin_lock_bh(&pmc->mca_lock);
2088
2089 sf_markstate(pmc);
2090 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2091 if (!delta)
2092 pmc->mca_sfcount[sfmode]++;
2093 err = 0;
2094 for (i=0; i<sfcount; i++) {
2095 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2096 if (err)
2097 break;
2098 }
2099 if (err) {
2100 int j;
2101
2102 if (!delta)
2103 pmc->mca_sfcount[sfmode]--;
2104 for (j=0; j<i; j++)
2105 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2106 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2107 struct inet6_dev *idev = pmc->idev;
2108 struct ip6_sf_list *psf;
2109
2110 /* filter mode change */
2111 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2112 pmc->mca_sfmode = MCAST_EXCLUDE;
2113 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2114 pmc->mca_sfmode = MCAST_INCLUDE;
2115 /* else no filters; keep old mode for reports */
2116
2117 pmc->mca_crcount = idev->mc_qrv;
2118 idev->mc_ifc_count = pmc->mca_crcount;
2119 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2120 psf->sf_crcount = 0;
2121 mld_ifc_event(idev);
2122 } else if (sf_setstate(pmc))
2123 mld_ifc_event(idev);
2124 spin_unlock_bh(&pmc->mca_lock);
2125 read_unlock_bh(&idev->lock);
2126 return err;
2127}
2128
2129static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2130{
2131 struct ip6_sf_list *psf, *nextpsf;
2132
2133 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2134 nextpsf = psf->sf_next;
2135 kfree(psf);
2136 }
2137 pmc->mca_tomb = NULL;
2138 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2139 nextpsf = psf->sf_next;
2140 kfree(psf);
2141 }
2142 pmc->mca_sources = NULL;
2143 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2144 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2145 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2146}
2147
2148
2149static void igmp6_join_group(struct ifmcaddr6 *ma)
2150{
2151 unsigned long delay;
2152
2153 if (ma->mca_flags & MAF_NOREPORT)
2154 return;
2155
2156 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2157
2158 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2159
2160 spin_lock_bh(&ma->mca_lock);
2161 if (del_timer(&ma->mca_timer)) {
2162 atomic_dec(&ma->mca_refcnt);
2163 delay = ma->mca_timer.expires - jiffies;
2164 }
2165
2166 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2167 atomic_inc(&ma->mca_refcnt);
2168 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2169 spin_unlock_bh(&ma->mca_lock);
2170}
2171
2172static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2173 struct inet6_dev *idev)
2174{
2175 int err;
2176
5ab4a6c8
DS		 2177 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2178 * so no other readers or writers of iml or its sflist
2179 */
cfcabdcc 2180 if (!iml->sflist) {
1da177e4
LT		 2181 /* any-source empty exclude case */
2182 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2183 }
2184 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2185 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2186 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2187 iml->sflist = NULL;
2188 return err;
2189}
2190
2191static void igmp6_leave_group(struct ifmcaddr6 *ma)
2192{
2193 if (MLD_V1_SEEN(ma->idev)) {
2194 if (ma->mca_flags & MAF_LAST_REPORTER)
2195 igmp6_send(&ma->mca_addr, ma->idev->dev,
2196 ICMPV6_MGM_REDUCTION);
2197 } else {
2198 mld_add_delrec(ma->idev, ma);
2199 mld_ifc_event(ma->idev);
2200 }
2201}
2202
2203static void mld_gq_timer_expire(unsigned long data)
2204{
2205 struct inet6_dev *idev = (struct inet6_dev *)data;
2206
2207 idev->mc_gq_running = 0;
2208 mld_send_report(idev, NULL);
2209 __in6_dev_put(idev);
2210}
2211
2212static void mld_ifc_timer_expire(unsigned long data)
2213{
2214 struct inet6_dev *idev = (struct inet6_dev *)data;
2215
2216 mld_send_cr(idev);
2217 if (idev->mc_ifc_count) {
2218 idev->mc_ifc_count--;
2219 if (idev->mc_ifc_count)
2220 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2221 }
2222 __in6_dev_put(idev);
2223}
2224
2225static void mld_ifc_event(struct inet6_dev *idev)
2226{
2227 if (MLD_V1_SEEN(idev))
2228 return;
2229 idev->mc_ifc_count = idev->mc_qrv;
2230 mld_ifc_start_timer(idev, 1);
2231}
2232
2233
2234static void igmp6_timer_handler(unsigned long data)
2235{
2236 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2237
2238 if (MLD_V1_SEEN(ma->idev))
2239 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2240 else
2241 mld_send_report(ma->idev, ma);
2242
2243 spin_lock(&ma->mca_lock);
2244 ma->mca_flags |= MAF_LAST_REPORTER;
2245 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2246 spin_unlock(&ma->mca_lock);
2247 ma_put(ma);
2248}
2249
2250/* Device going down */
2251
2252void ipv6_mc_down(struct inet6_dev *idev)
2253{
2254 struct ifmcaddr6 *i;
2255
2256 /* Withdraw multicast list */
2257
2258 read_lock_bh(&idev->lock);
2259 idev->mc_ifc_count = 0;
2260 if (del_timer(&idev->mc_ifc_timer))
2261 __in6_dev_put(idev);
2262 idev->mc_gq_running = 0;
2263 if (del_timer(&idev->mc_gq_timer))
2264 __in6_dev_put(idev);
2265
2266 for (i = idev->mc_list; i; i=i->next)
2267 igmp6_group_dropped(i);
2268 read_unlock_bh(&idev->lock);
2269
2270 mld_clear_delrec(idev);
2271}
2272
2273
2274/* Device going up */
2275
2276void ipv6_mc_up(struct inet6_dev *idev)
2277{
2278 struct ifmcaddr6 *i;
2279
2280 /* Install multicast list, except for all-nodes (already installed) */
2281
2282 read_lock_bh(&idev->lock);
2283 for (i = idev->mc_list; i; i=i->next)
2284 igmp6_group_added(i);
2285 read_unlock_bh(&idev->lock);
2286}
2287
2288/* IPv6 device initialization. */
2289
2290void ipv6_mc_init_dev(struct inet6_dev *idev)
2291{
1da177e4
LT		 2292 write_lock_bh(&idev->lock);
2293 rwlock_init(&idev->mc_lock);
2294 idev->mc_gq_running = 0;
b24b8a24
PE		 2295 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2296 (unsigned long)idev);
1da177e4
LT		 2297 idev->mc_tomb = NULL;
2298 idev->mc_ifc_count = 0;
b24b8a24
PE		 2299 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2300 (unsigned long)idev);
1da177e4
LT		 2301 idev->mc_qrv = MLD_QRV_DEFAULT;
2302 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2303 idev->mc_v1_seen = 0;
2304 write_unlock_bh(&idev->lock);
1da177e4
LT		 2305}
2306
2307/*
2308 * Device is about to be destroyed: clean up.
2309 */
2310
2311void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2312{
2313 struct ifmcaddr6 *i;
2314 struct in6_addr maddr;
2315
2316 /* Deactivate timers */
2317 ipv6_mc_down(idev);
2318
2319 /* Delete all-nodes address. */
2320 ipv6_addr_all_nodes(&maddr);
2321
2322 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2323 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2324 * fail.
2325 */
2326 __ipv6_dev_mc_dec(idev, &maddr);
2327
2328 if (idev->cnf.forwarding) {
2329 ipv6_addr_all_routers(&maddr);
2330 __ipv6_dev_mc_dec(idev, &maddr);
2331 }
2332
2333 write_lock_bh(&idev->lock);
2334 while ((i = idev->mc_list) != NULL) {
2335 idev->mc_list = i->next;
2336 write_unlock_bh(&idev->lock);
2337
2338 igmp6_group_dropped(i);
2339 ma_put(i);
2340
2341 write_lock_bh(&idev->lock);
2342 }
2343 write_unlock_bh(&idev->lock);
2344}
2345
2346#ifdef CONFIG_PROC_FS
2347struct igmp6_mc_iter_state {
b8ad0cbc 2348 struct seq_net_private p;
1da177e4
LT		 2349 struct net_device *dev;
2350 struct inet6_dev *idev;
2351};
2352
2353#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2354
2355static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2356{
2357 struct ifmcaddr6 *im = NULL;
2358 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2359 struct net *net = seq_file_net(seq);
1da177e4 2360
7562f876 2361 state->idev = NULL;
b8ad0cbc 2362 for_each_netdev(net, state->dev) {
1da177e4
LT		 2363 struct inet6_dev *idev;
2364 idev = in6_dev_get(state->dev);
2365 if (!idev)
2366 continue;
2367 read_lock_bh(&idev->lock);
2368 im = idev->mc_list;
2369 if (im) {
2370 state->idev = idev;
2371 break;
2372 }
2373 read_unlock_bh(&idev->lock);
2374 in6_dev_put(idev);
2375 }
2376 return im;
2377}
2378
2379static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2380{
2381 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2382
2383 im = im->next;
2384 while (!im) {
2385 if (likely(state->idev != NULL)) {
2386 read_unlock_bh(&state->idev->lock);
2387 in6_dev_put(state->idev);
2388 }
7562f876 2389 state->dev = next_net_device(state->dev);
1da177e4
LT		 2390 if (!state->dev) {
2391 state->idev = NULL;
2392 break;
2393 }
2394 state->idev = in6_dev_get(state->dev);
2395 if (!state->idev)
2396 continue;
2397 read_lock_bh(&state->idev->lock);
2398 im = state->idev->mc_list;
2399 }
2400 return im;
2401}
2402
2403static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2404{
2405 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2406 if (im)
2407 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2408 --pos;
2409 return pos ? NULL : im;
2410}
2411
2412static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2413 __acquires(dev_base_lock)
1da177e4
LT		 2414{
2415 read_lock(&dev_base_lock);
2416 return igmp6_mc_get_idx(seq, *pos);
2417}
2418
2419static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2420{
2421 struct ifmcaddr6 *im;
2422 im = igmp6_mc_get_next(seq, v);
2423 ++*pos;
2424 return im;
2425}
2426
2427static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
9a429c49 2428 __releases(dev_base_lock)
1da177e4
LT		 2429{
2430 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2431 if (likely(state->idev != NULL)) {
2432 read_unlock_bh(&state->idev->lock);
2433 in6_dev_put(state->idev);
2434 state->idev = NULL;
2435 }
2436 state->dev = NULL;
2437 read_unlock(&dev_base_lock);
2438}
2439
2440static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2441{
2442 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2443 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2444
2445 seq_printf(seq,
1ab1457c 2446 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
1da177e4
LT		 2447 state->dev->ifindex, state->dev->name,
2448 NIP6(im->mca_addr),
2449 im->mca_users, im->mca_flags,
2450 (im->mca_flags&MAF_TIMER_RUNNING) ?
2451 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2452 return 0;
2453}
2454
56b3d975 2455static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2456 .start = igmp6_mc_seq_start,
2457 .next = igmp6_mc_seq_next,
2458 .stop = igmp6_mc_seq_stop,
2459 .show = igmp6_mc_seq_show,
2460};
2461
2462static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2463{
b8ad0cbc
DL		 2464 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2465 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2466}
2467
9a32144e 2468static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2469 .owner = THIS_MODULE,
2470 .open = igmp6_mc_seq_open,
2471 .read = seq_read,
2472 .llseek = seq_lseek,
b8ad0cbc 2473 .release = seq_release_net,
1da177e4
LT		 2474};
2475
2476struct igmp6_mcf_iter_state {
b8ad0cbc 2477 struct seq_net_private p;
1da177e4
LT		 2478 struct net_device *dev;
2479 struct inet6_dev *idev;
2480 struct ifmcaddr6 *im;
2481};
2482
2483#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2484
2485static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2486{
2487 struct ip6_sf_list *psf = NULL;
2488 struct ifmcaddr6 *im = NULL;
2489 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2490 struct net *net = seq_file_net(seq);
1da177e4 2491
7562f876
PE		 2492 state->idev = NULL;
2493 state->im = NULL;
b8ad0cbc 2494 for_each_netdev(net, state->dev) {
1da177e4
LT		 2495 struct inet6_dev *idev;
2496 idev = in6_dev_get(state->dev);
2497 if (unlikely(idev == NULL))
2498 continue;
2499 read_lock_bh(&idev->lock);
2500 im = idev->mc_list;
2501 if (likely(im != NULL)) {
2502 spin_lock_bh(&im->mca_lock);
2503 psf = im->mca_sources;
2504 if (likely(psf != NULL)) {
2505 state->im = im;
2506 state->idev = idev;
2507 break;
2508 }
2509 spin_unlock_bh(&im->mca_lock);
2510 }
2511 read_unlock_bh(&idev->lock);
2512 in6_dev_put(idev);
2513 }
2514 return psf;
2515}
2516
2517static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2518{
2519 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2520
2521 psf = psf->sf_next;
2522 while (!psf) {
2523 spin_unlock_bh(&state->im->mca_lock);
2524 state->im = state->im->next;
2525 while (!state->im) {
2526 if (likely(state->idev != NULL)) {
2527 read_unlock_bh(&state->idev->lock);
2528 in6_dev_put(state->idev);
2529 }
7562f876 2530 state->dev = next_net_device(state->dev);
1da177e4
LT		 2531 if (!state->dev) {
2532 state->idev = NULL;
2533 goto out;
2534 }
2535 state->idev = in6_dev_get(state->dev);
2536 if (!state->idev)
2537 continue;
2538 read_lock_bh(&state->idev->lock);
2539 state->im = state->idev->mc_list;
2540 }
2541 if (!state->im)
2542 break;
2543 spin_lock_bh(&state->im->mca_lock);
2544 psf = state->im->mca_sources;
2545 }
2546out:
2547 return psf;
2548}
2549
2550static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2551{
2552 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2553 if (psf)
2554 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2555 --pos;
2556 return pos ? NULL : psf;
2557}
2558
2559static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2560 __acquires(dev_base_lock)
1da177e4
LT		 2561{
2562 read_lock(&dev_base_lock);
2563 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2564}
2565
2566static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2567{
2568 struct ip6_sf_list *psf;
2569 if (v == SEQ_START_TOKEN)
2570 psf = igmp6_mcf_get_first(seq);
2571 else
2572 psf = igmp6_mcf_get_next(seq, v);
2573 ++*pos;
2574 return psf;
2575}
2576
2577static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
9a429c49 2578 __releases(dev_base_lock)
1da177e4
LT		 2579{
2580 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2581 if (likely(state->im != NULL)) {
2582 spin_unlock_bh(&state->im->mca_lock);
2583 state->im = NULL;
2584 }
2585 if (likely(state->idev != NULL)) {
2586 read_unlock_bh(&state->idev->lock);
2587 in6_dev_put(state->idev);
2588 state->idev = NULL;
2589 }
2590 state->dev = NULL;
2591 read_unlock(&dev_base_lock);
2592}
2593
2594static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2595{
2596 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2597 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2598
2599 if (v == SEQ_START_TOKEN) {
1ab1457c 2600 seq_printf(seq,
1da177e4 2601 "%3s %6s "
9343e79a 2602 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2603 "Device", "Multicast Address",
2604 "Source Address", "INC", "EXC");
2605 } else {
2606 seq_printf(seq,
9343e79a 2607 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
1da177e4
LT		 2608 state->dev->ifindex, state->dev->name,
2609 NIP6(state->im->mca_addr),
2610 NIP6(psf->sf_addr),
2611 psf->sf_count[MCAST_INCLUDE],
2612 psf->sf_count[MCAST_EXCLUDE]);
2613 }
2614 return 0;
2615}
2616
56b3d975 2617static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2618 .start = igmp6_mcf_seq_start,
2619 .next = igmp6_mcf_seq_next,
2620 .stop = igmp6_mcf_seq_stop,
2621 .show = igmp6_mcf_seq_show,
2622};
2623
2624static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2625{
b8ad0cbc
DL		 2626 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2627 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 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,
b8ad0cbc 2635 .release = seq_release_net,
1da177e4 2636};
ea82edf7
DL		 2637
2638static int igmp6_proc_init(struct net *net)
2639{
2640 int err;
2641
2642 err = -ENOMEM;
2643 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2644 goto out;
2645 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2646 &igmp6_mcf_seq_fops))
2647 goto out_proc_net_igmp6;
2648
2649 err = 0;
2650out:
2651 return err;
2652
2653out_proc_net_igmp6:
2654 proc_net_remove(net, "igmp6");
2655 goto out;
2656}
2657
2658static void igmp6_proc_exit(struct net *net)
2659{
2660 proc_net_remove(net, "mcfilter6");
2661 proc_net_remove(net, "igmp6");
2662}
2663#else
2664static int igmp6_proc_init(struct net *net)
2665{
2666 return 0;
2667}
2668static void igmp6_proc_exit(struct net *net)
2669{
2670 ;
2671}
1da177e4
LT		 2672#endif
2673
b8ad0cbc 2674static int igmp6_net_init(struct net *net)
1da177e4 2675{
1da177e4
LT		 2676 int err;
2677
1ed8516f
DL		 2678 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2679 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 2680 if (err < 0) {
2681 printk(KERN_ERR
2682 "Failed to initialize the IGMP6 control socket (err %d).\n",
2683 err);
b8ad0cbc 2684 goto out;
1da177e4
LT		 2685 }
2686
1ed8516f 2687 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2688
ea82edf7
DL		 2689 err = igmp6_proc_init(net);
2690 if (err)
b8ad0cbc 2691 goto out_sock_create;
b8ad0cbc
DL		 2692out:
2693 return err;
2694
2695out_sock_create:
1ed8516f 2696 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2697 goto out;
1da177e4
LT		 2698}
2699
b8ad0cbc 2700static void igmp6_net_exit(struct net *net)
1da177e4 2701{
1ed8516f 2702 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2703 igmp6_proc_exit(net);
1da177e4 2704}
b8ad0cbc
DL		 2705
2706static struct pernet_operations igmp6_net_ops = {
2707 .init = igmp6_net_init,
2708 .exit = igmp6_net_exit,
2709};
2710
2711int __init igmp6_init(void)
2712{
2713 return register_pernet_subsys(&igmp6_net_ops);
2714}
2715
2716void igmp6_cleanup(void)
2717{
2718 unregister_pernet_subsys(&igmp6_net_ops);
2719}
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