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[NETNS][IPV6] route6 - Pass the network namespace parameter to rt6_lookup
[linux-2.6/cjktty.git] / net / ipv6 / mcast.c
blob197ca390a15d166fa24f092af51e107873deb601
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/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
52 #include <net/net_namespace.h>
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
84 struct mld2_grec {
85 __u8 grec_type;
86 __u8 grec_auxwords;
87 __be16 grec_nsrcs;
88 struct in6_addr grec_mca;
89 struct in6_addr grec_src[0];
90 };
91
92 struct mld2_report {
93 __u8 type;
94 __u8 resv1;
95 __sum16 csum;
96 __be16 resv2;
97 __be16 ngrec;
98 struct mld2_grec grec[0];
99 };
100
101 struct mld2_query {
102 __u8 type;
103 __u8 code;
104 __sum16 csum;
105 __be16 mrc;
106 __be16 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 __be16 nsrcs;
121 struct in6_addr srcs[0];
122 };
123
124 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
125
126 /* Big mc list lock for all the sockets */
127 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
128
129 static struct socket *igmp6_socket;
130
131 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
132
133 static void igmp6_join_group(struct ifmcaddr6 *ma);
134 static void igmp6_leave_group(struct ifmcaddr6 *ma);
135 static void igmp6_timer_handler(unsigned long data);
136
137 static void mld_gq_timer_expire(unsigned long data);
138 static void mld_ifc_timer_expire(unsigned long data);
139 static void mld_ifc_event(struct inet6_dev *idev);
140 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
141 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
142 static void mld_clear_delrec(struct inet6_dev *idev);
143 static int sf_setstate(struct ifmcaddr6 *pmc);
144 static void sf_markstate(struct ifmcaddr6 *pmc);
145 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
146 static 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);
149 static 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);
152 static 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) : \
167 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
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
173 #define IPV6_MLD_MAX_MSF 64
174
175 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
176
177 /*
178 * socket join on multicast group
179 */
180
181 int 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
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
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(&init_net, 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(&init_net, 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;
227 rwlock_init(&mc_lst->sflock);
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 */
255 int 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(&init_net, mc_lst->ifindex)) != NULL) {
270 struct inet6_dev *idev = in6_dev_get(dev);
271
272 (void) ip6_mc_leave_src(sk, mc_lst, idev);
273 if (idev) {
274 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
275 in6_dev_put(idev);
276 }
277 dev_put(dev);
278 } else
279 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
280 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
281 return 0;
282 }
283 }
284 write_unlock_bh(&ipv6_sk_mc_lock);
285
286 return -EADDRNOTAVAIL;
287 }
288
289 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
290 {
291 struct net_device *dev = NULL;
292 struct inet6_dev *idev = NULL;
293
294 if (ifindex == 0) {
295 struct rt6_info *rt;
296
297 rt = rt6_lookup(&init_net, group, NULL, 0, 0);
298 if (rt) {
299 dev = rt->rt6i_dev;
300 dev_hold(dev);
301 dst_release(&rt->u.dst);
302 }
303 } else
304 dev = dev_get_by_index(&init_net, ifindex);
305
306 if (!dev)
307 return NULL;
308 idev = in6_dev_get(dev);
309 if (!idev) {
310 dev_put(dev);
311 return NULL;
312 }
313 read_lock_bh(&idev->lock);
314 if (idev->dead) {
315 read_unlock_bh(&idev->lock);
316 in6_dev_put(idev);
317 dev_put(dev);
318 return NULL;
319 }
320 return idev;
321 }
322
323 void ipv6_sock_mc_close(struct sock *sk)
324 {
325 struct ipv6_pinfo *np = inet6_sk(sk);
326 struct ipv6_mc_socklist *mc_lst;
327
328 write_lock_bh(&ipv6_sk_mc_lock);
329 while ((mc_lst = np->ipv6_mc_list) != NULL) {
330 struct net_device *dev;
331
332 np->ipv6_mc_list = mc_lst->next;
333 write_unlock_bh(&ipv6_sk_mc_lock);
334
335 dev = dev_get_by_index(&init_net, mc_lst->ifindex);
336 if (dev) {
337 struct inet6_dev *idev = in6_dev_get(dev);
338
339 (void) ip6_mc_leave_src(sk, mc_lst, idev);
340 if (idev) {
341 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
342 in6_dev_put(idev);
343 }
344 dev_put(dev);
345 } else
346 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
347
348 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
349
350 write_lock_bh(&ipv6_sk_mc_lock);
351 }
352 write_unlock_bh(&ipv6_sk_mc_lock);
353 }
354
355 int ip6_mc_source(int add, int omode, struct sock *sk,
356 struct group_source_req *pgsr)
357 {
358 struct in6_addr *source, *group;
359 struct ipv6_mc_socklist *pmc;
360 struct net_device *dev;
361 struct inet6_dev *idev;
362 struct ipv6_pinfo *inet6 = inet6_sk(sk);
363 struct ip6_sf_socklist *psl;
364 int i, j, rv;
365 int leavegroup = 0;
366 int pmclocked = 0;
367 int err;
368
369 if (pgsr->gsr_group.ss_family != AF_INET6 ||
370 pgsr->gsr_source.ss_family != AF_INET6)
371 return -EINVAL;
372
373 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
374 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
375
376 if (!ipv6_addr_is_multicast(group))
377 return -EINVAL;
378
379 idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
380 if (!idev)
381 return -ENODEV;
382 dev = idev->dev;
383
384 err = -EADDRNOTAVAIL;
385
386 read_lock_bh(&ipv6_sk_mc_lock);
387 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
389 continue;
390 if (ipv6_addr_equal(&pmc->addr, group))
391 break;
392 }
393 if (!pmc) { /* must have a prior join */
394 err = -EINVAL;
395 goto done;
396 }
397 /* if a source filter was set, must be the same mode as before */
398 if (pmc->sflist) {
399 if (pmc->sfmode != omode) {
400 err = -EINVAL;
401 goto done;
402 }
403 } else if (pmc->sfmode != omode) {
404 /* allow mode switches for empty-set filters */
405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
407 pmc->sfmode = omode;
408 }
409
410 write_lock_bh(&pmc->sflock);
411 pmclocked = 1;
412
413 psl = pmc->sflist;
414 if (!add) {
415 if (!psl)
416 goto done; /* err = -EADDRNOTAVAIL */
417 rv = !0;
418 for (i=0; i<psl->sl_count; i++) {
419 rv = memcmp(&psl->sl_addr[i], source,
420 sizeof(struct in6_addr));
421 if (rv == 0)
422 break;
423 }
424 if (rv) /* source not found */
425 goto done; /* err = -EADDRNOTAVAIL */
426
427 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
428 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
429 leavegroup = 1;
430 goto done;
431 }
432
433 /* update the interface filter */
434 ip6_mc_del_src(idev, group, omode, 1, source, 1);
435
436 for (j=i+1; j<psl->sl_count; j++)
437 psl->sl_addr[j-1] = psl->sl_addr[j];
438 psl->sl_count--;
439 err = 0;
440 goto done;
441 }
442 /* else, add a new source to the filter */
443
444 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
445 err = -ENOBUFS;
446 goto done;
447 }
448 if (!psl || psl->sl_count == psl->sl_max) {
449 struct ip6_sf_socklist *newpsl;
450 int count = IP6_SFBLOCK;
451
452 if (psl)
453 count += psl->sl_max;
454 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
455 if (!newpsl) {
456 err = -ENOBUFS;
457 goto done;
458 }
459 newpsl->sl_max = count;
460 newpsl->sl_count = count - IP6_SFBLOCK;
461 if (psl) {
462 for (i=0; i<psl->sl_count; i++)
463 newpsl->sl_addr[i] = psl->sl_addr[i];
464 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
465 }
466 pmc->sflist = psl = newpsl;
467 }
468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
469 for (i=0; i<psl->sl_count; i++) {
470 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
471 if (rv == 0)
472 break;
473 }
474 if (rv == 0) /* address already there is an error */
475 goto done;
476 for (j=psl->sl_count-1; j>=i; j--)
477 psl->sl_addr[j+1] = psl->sl_addr[j];
478 psl->sl_addr[i] = *source;
479 psl->sl_count++;
480 err = 0;
481 /* update the interface list */
482 ip6_mc_add_src(idev, group, omode, 1, source, 1);
483 done:
484 if (pmclocked)
485 write_unlock_bh(&pmc->sflock);
486 read_unlock_bh(&ipv6_sk_mc_lock);
487 read_unlock_bh(&idev->lock);
488 in6_dev_put(idev);
489 dev_put(dev);
490 if (leavegroup)
491 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
492 return err;
493 }
494
495 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
496 {
497 struct in6_addr *group;
498 struct ipv6_mc_socklist *pmc;
499 struct net_device *dev;
500 struct inet6_dev *idev;
501 struct ipv6_pinfo *inet6 = inet6_sk(sk);
502 struct ip6_sf_socklist *newpsl, *psl;
503 int leavegroup = 0;
504 int i, err;
505
506 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
507
508 if (!ipv6_addr_is_multicast(group))
509 return -EINVAL;
510 if (gsf->gf_fmode != MCAST_INCLUDE &&
511 gsf->gf_fmode != MCAST_EXCLUDE)
512 return -EINVAL;
513
514 idev = ip6_mc_find_dev(group, gsf->gf_interface);
515
516 if (!idev)
517 return -ENODEV;
518 dev = idev->dev;
519
520 err = 0;
521 read_lock_bh(&ipv6_sk_mc_lock);
522
523 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
524 leavegroup = 1;
525 goto done;
526 }
527
528 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
529 if (pmc->ifindex != gsf->gf_interface)
530 continue;
531 if (ipv6_addr_equal(&pmc->addr, group))
532 break;
533 }
534 if (!pmc) { /* must have a prior join */
535 err = -EINVAL;
536 goto done;
537 }
538 if (gsf->gf_numsrc) {
539 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
540 GFP_ATOMIC);
541 if (!newpsl) {
542 err = -ENOBUFS;
543 goto done;
544 }
545 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
546 for (i=0; i<newpsl->sl_count; ++i) {
547 struct sockaddr_in6 *psin6;
548
549 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
550 newpsl->sl_addr[i] = psin6->sin6_addr;
551 }
552 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
553 newpsl->sl_count, newpsl->sl_addr, 0);
554 if (err) {
555 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
556 goto done;
557 }
558 } else {
559 newpsl = NULL;
560 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
561 }
562
563 write_lock_bh(&pmc->sflock);
564 psl = pmc->sflist;
565 if (psl) {
566 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
567 psl->sl_count, psl->sl_addr, 0);
568 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
569 } else
570 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
571 pmc->sflist = newpsl;
572 pmc->sfmode = gsf->gf_fmode;
573 write_unlock_bh(&pmc->sflock);
574 err = 0;
575 done:
576 read_unlock_bh(&ipv6_sk_mc_lock);
577 read_unlock_bh(&idev->lock);
578 in6_dev_put(idev);
579 dev_put(dev);
580 if (leavegroup)
581 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
582 return err;
583 }
584
585 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
586 struct group_filter __user *optval, int __user *optlen)
587 {
588 int err, i, count, copycount;
589 struct in6_addr *group;
590 struct ipv6_mc_socklist *pmc;
591 struct inet6_dev *idev;
592 struct net_device *dev;
593 struct ipv6_pinfo *inet6 = inet6_sk(sk);
594 struct ip6_sf_socklist *psl;
595
596 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
597
598 if (!ipv6_addr_is_multicast(group))
599 return -EINVAL;
600
601 idev = ip6_mc_find_dev(group, gsf->gf_interface);
602
603 if (!idev)
604 return -ENODEV;
605
606 dev = idev->dev;
607
608 err = -EADDRNOTAVAIL;
609 /*
610 * changes to the ipv6_mc_list require the socket lock and
611 * a read lock on ip6_sk_mc_lock. We have the socket lock,
612 * so reading the list is safe.
613 */
614
615 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
616 if (pmc->ifindex != gsf->gf_interface)
617 continue;
618 if (ipv6_addr_equal(group, &pmc->addr))
619 break;
620 }
621 if (!pmc) /* must have a prior join */
622 goto done;
623 gsf->gf_fmode = pmc->sfmode;
624 psl = pmc->sflist;
625 count = psl ? psl->sl_count : 0;
626 read_unlock_bh(&idev->lock);
627 in6_dev_put(idev);
628 dev_put(dev);
629
630 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
631 gsf->gf_numsrc = count;
632 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
633 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
634 return -EFAULT;
635 }
636 /* changes to psl require the socket lock, a read lock on
637 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
638 * have the socket lock, so reading here is safe.
639 */
640 for (i=0; i<copycount; i++) {
641 struct sockaddr_in6 *psin6;
642 struct sockaddr_storage ss;
643
644 psin6 = (struct sockaddr_in6 *)&ss;
645 memset(&ss, 0, sizeof(ss));
646 psin6->sin6_family = AF_INET6;
647 psin6->sin6_addr = psl->sl_addr[i];
648 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
649 return -EFAULT;
650 }
651 return 0;
652 done:
653 read_unlock_bh(&idev->lock);
654 in6_dev_put(idev);
655 dev_put(dev);
656 return err;
657 }
658
659 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
660 struct in6_addr *src_addr)
661 {
662 struct ipv6_pinfo *np = inet6_sk(sk);
663 struct ipv6_mc_socklist *mc;
664 struct ip6_sf_socklist *psl;
665 int rv = 1;
666
667 read_lock(&ipv6_sk_mc_lock);
668 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
669 if (ipv6_addr_equal(&mc->addr, mc_addr))
670 break;
671 }
672 if (!mc) {
673 read_unlock(&ipv6_sk_mc_lock);
674 return 1;
675 }
676 read_lock(&mc->sflock);
677 psl = mc->sflist;
678 if (!psl) {
679 rv = mc->sfmode == MCAST_EXCLUDE;
680 } else {
681 int i;
682
683 for (i=0; i<psl->sl_count; i++) {
684 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
685 break;
686 }
687 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
688 rv = 0;
689 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
690 rv = 0;
691 }
692 read_unlock(&mc->sflock);
693 read_unlock(&ipv6_sk_mc_lock);
694
695 return rv;
696 }
697
698 static void ma_put(struct ifmcaddr6 *mc)
699 {
700 if (atomic_dec_and_test(&mc->mca_refcnt)) {
701 in6_dev_put(mc->idev);
702 kfree(mc);
703 }
704 }
705
706 static void igmp6_group_added(struct ifmcaddr6 *mc)
707 {
708 struct net_device *dev = mc->idev->dev;
709 char buf[MAX_ADDR_LEN];
710
711 spin_lock_bh(&mc->mca_lock);
712 if (!(mc->mca_flags&MAF_LOADED)) {
713 mc->mca_flags |= MAF_LOADED;
714 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
715 dev_mc_add(dev, buf, dev->addr_len, 0);
716 }
717 spin_unlock_bh(&mc->mca_lock);
718
719 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
720 return;
721
722 if (MLD_V1_SEEN(mc->idev)) {
723 igmp6_join_group(mc);
724 return;
725 }
726 /* else v2 */
727
728 mc->mca_crcount = mc->idev->mc_qrv;
729 mld_ifc_event(mc->idev);
730 }
731
732 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
733 {
734 struct net_device *dev = mc->idev->dev;
735 char buf[MAX_ADDR_LEN];
736
737 spin_lock_bh(&mc->mca_lock);
738 if (mc->mca_flags&MAF_LOADED) {
739 mc->mca_flags &= ~MAF_LOADED;
740 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
741 dev_mc_delete(dev, buf, dev->addr_len, 0);
742 }
743
744 if (mc->mca_flags & MAF_NOREPORT)
745 goto done;
746 spin_unlock_bh(&mc->mca_lock);
747
748 if (!mc->idev->dead)
749 igmp6_leave_group(mc);
750
751 spin_lock_bh(&mc->mca_lock);
752 if (del_timer(&mc->mca_timer))
753 atomic_dec(&mc->mca_refcnt);
754 done:
755 ip6_mc_clear_src(mc);
756 spin_unlock_bh(&mc->mca_lock);
757 }
758
759 /*
760 * deleted ifmcaddr6 manipulation
761 */
762 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
763 {
764 struct ifmcaddr6 *pmc;
765
766 /* this is an "ifmcaddr6" for convenience; only the fields below
767 * are actually used. In particular, the refcnt and users are not
768 * used for management of the delete list. Using the same structure
769 * for deleted items allows change reports to use common code with
770 * non-deleted or query-response MCA's.
771 */
772 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
773 if (!pmc)
774 return;
775
776 spin_lock_bh(&im->mca_lock);
777 spin_lock_init(&pmc->mca_lock);
778 pmc->idev = im->idev;
779 in6_dev_hold(idev);
780 pmc->mca_addr = im->mca_addr;
781 pmc->mca_crcount = idev->mc_qrv;
782 pmc->mca_sfmode = im->mca_sfmode;
783 if (pmc->mca_sfmode == MCAST_INCLUDE) {
784 struct ip6_sf_list *psf;
785
786 pmc->mca_tomb = im->mca_tomb;
787 pmc->mca_sources = im->mca_sources;
788 im->mca_tomb = im->mca_sources = NULL;
789 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
790 psf->sf_crcount = pmc->mca_crcount;
791 }
792 spin_unlock_bh(&im->mca_lock);
793
794 write_lock_bh(&idev->mc_lock);
795 pmc->next = idev->mc_tomb;
796 idev->mc_tomb = pmc;
797 write_unlock_bh(&idev->mc_lock);
798 }
799
800 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
801 {
802 struct ifmcaddr6 *pmc, *pmc_prev;
803 struct ip6_sf_list *psf, *psf_next;
804
805 write_lock_bh(&idev->mc_lock);
806 pmc_prev = NULL;
807 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
808 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
809 break;
810 pmc_prev = pmc;
811 }
812 if (pmc) {
813 if (pmc_prev)
814 pmc_prev->next = pmc->next;
815 else
816 idev->mc_tomb = pmc->next;
817 }
818 write_unlock_bh(&idev->mc_lock);
819 if (pmc) {
820 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
821 psf_next = psf->sf_next;
822 kfree(psf);
823 }
824 in6_dev_put(pmc->idev);
825 kfree(pmc);
826 }
827 }
828
829 static void mld_clear_delrec(struct inet6_dev *idev)
830 {
831 struct ifmcaddr6 *pmc, *nextpmc;
832
833 write_lock_bh(&idev->mc_lock);
834 pmc = idev->mc_tomb;
835 idev->mc_tomb = NULL;
836 write_unlock_bh(&idev->mc_lock);
837
838 for (; pmc; pmc = nextpmc) {
839 nextpmc = pmc->next;
840 ip6_mc_clear_src(pmc);
841 in6_dev_put(pmc->idev);
842 kfree(pmc);
843 }
844
845 /* clear dead sources, too */
846 read_lock_bh(&idev->lock);
847 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
848 struct ip6_sf_list *psf, *psf_next;
849
850 spin_lock_bh(&pmc->mca_lock);
851 psf = pmc->mca_tomb;
852 pmc->mca_tomb = NULL;
853 spin_unlock_bh(&pmc->mca_lock);
854 for (; psf; psf=psf_next) {
855 psf_next = psf->sf_next;
856 kfree(psf);
857 }
858 }
859 read_unlock_bh(&idev->lock);
860 }
861
862
863 /*
864 * device multicast group inc (add if not found)
865 */
866 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
867 {
868 struct ifmcaddr6 *mc;
869 struct inet6_dev *idev;
870
871 idev = in6_dev_get(dev);
872
873 if (idev == NULL)
874 return -EINVAL;
875
876 write_lock_bh(&idev->lock);
877 if (idev->dead) {
878 write_unlock_bh(&idev->lock);
879 in6_dev_put(idev);
880 return -ENODEV;
881 }
882
883 for (mc = idev->mc_list; mc; mc = mc->next) {
884 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
885 mc->mca_users++;
886 write_unlock_bh(&idev->lock);
887 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
888 NULL, 0);
889 in6_dev_put(idev);
890 return 0;
891 }
892 }
893
894 /*
895 * not found: create a new one.
896 */
897
898 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
899
900 if (mc == NULL) {
901 write_unlock_bh(&idev->lock);
902 in6_dev_put(idev);
903 return -ENOMEM;
904 }
905
906 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
907
908 ipv6_addr_copy(&mc->mca_addr, addr);
909 mc->idev = idev;
910 mc->mca_users = 1;
911 /* mca_stamp should be updated upon changes */
912 mc->mca_cstamp = mc->mca_tstamp = jiffies;
913 atomic_set(&mc->mca_refcnt, 2);
914 spin_lock_init(&mc->mca_lock);
915
916 /* initial mode is (EX, empty) */
917 mc->mca_sfmode = MCAST_EXCLUDE;
918 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
919
920 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
921 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
922 mc->mca_flags |= MAF_NOREPORT;
923
924 mc->next = idev->mc_list;
925 idev->mc_list = mc;
926 write_unlock_bh(&idev->lock);
927
928 mld_del_delrec(idev, &mc->mca_addr);
929 igmp6_group_added(mc);
930 ma_put(mc);
931 return 0;
932 }
933
934 /*
935 * device multicast group del
936 */
937 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
938 {
939 struct ifmcaddr6 *ma, **map;
940
941 write_lock_bh(&idev->lock);
942 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
943 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
944 if (--ma->mca_users == 0) {
945 *map = ma->next;
946 write_unlock_bh(&idev->lock);
947
948 igmp6_group_dropped(ma);
949
950 ma_put(ma);
951 return 0;
952 }
953 write_unlock_bh(&idev->lock);
954 return 0;
955 }
956 }
957 write_unlock_bh(&idev->lock);
958
959 return -ENOENT;
960 }
961
962 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
963 {
964 struct inet6_dev *idev = in6_dev_get(dev);
965 int err;
966
967 if (!idev)
968 return -ENODEV;
969
970 err = __ipv6_dev_mc_dec(idev, addr);
971
972 in6_dev_put(idev);
973
974 return err;
975 }
976
977 /*
978 * identify MLD packets for MLD filter exceptions
979 */
980 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
981 {
982 struct icmp6hdr *pic;
983
984 if (nexthdr != IPPROTO_ICMPV6)
985 return 0;
986
987 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
988 return 0;
989
990 pic = icmp6_hdr(skb);
991
992 switch (pic->icmp6_type) {
993 case ICMPV6_MGM_QUERY:
994 case ICMPV6_MGM_REPORT:
995 case ICMPV6_MGM_REDUCTION:
996 case ICMPV6_MLD2_REPORT:
997 return 1;
998 default:
999 break;
1000 }
1001 return 0;
1002 }
1003
1004 /*
1005 * check if the interface/address pair is valid
1006 */
1007 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1008 struct in6_addr *src_addr)
1009 {
1010 struct inet6_dev *idev;
1011 struct ifmcaddr6 *mc;
1012 int rv = 0;
1013
1014 idev = in6_dev_get(dev);
1015 if (idev) {
1016 read_lock_bh(&idev->lock);
1017 for (mc = idev->mc_list; mc; mc=mc->next) {
1018 if (ipv6_addr_equal(&mc->mca_addr, group))
1019 break;
1020 }
1021 if (mc) {
1022 if (src_addr && !ipv6_addr_any(src_addr)) {
1023 struct ip6_sf_list *psf;
1024
1025 spin_lock_bh(&mc->mca_lock);
1026 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1027 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1028 break;
1029 }
1030 if (psf)
1031 rv = psf->sf_count[MCAST_INCLUDE] ||
1032 psf->sf_count[MCAST_EXCLUDE] !=
1033 mc->mca_sfcount[MCAST_EXCLUDE];
1034 else
1035 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1036 spin_unlock_bh(&mc->mca_lock);
1037 } else
1038 rv = 1; /* don't filter unspecified source */
1039 }
1040 read_unlock_bh(&idev->lock);
1041 in6_dev_put(idev);
1042 }
1043 return rv;
1044 }
1045
1046 static void mld_gq_start_timer(struct inet6_dev *idev)
1047 {
1048 int tv = net_random() % idev->mc_maxdelay;
1049
1050 idev->mc_gq_running = 1;
1051 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1052 in6_dev_hold(idev);
1053 }
1054
1055 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1056 {
1057 int tv = net_random() % delay;
1058
1059 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1060 in6_dev_hold(idev);
1061 }
1062
1063 /*
1064 * IGMP handling (alias multicast ICMPv6 messages)
1065 */
1066
1067 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1068 {
1069 unsigned long delay = resptime;
1070
1071 /* Do not start timer for these addresses */
1072 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1073 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1074 return;
1075
1076 if (del_timer(&ma->mca_timer)) {
1077 atomic_dec(&ma->mca_refcnt);
1078 delay = ma->mca_timer.expires - jiffies;
1079 }
1080
1081 if (delay >= resptime) {
1082 if (resptime)
1083 delay = net_random() % resptime;
1084 else
1085 delay = 1;
1086 }
1087 ma->mca_timer.expires = jiffies + delay;
1088 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1089 atomic_inc(&ma->mca_refcnt);
1090 ma->mca_flags |= MAF_TIMER_RUNNING;
1091 }
1092
1093 /* mark EXCLUDE-mode sources */
1094 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1095 struct in6_addr *srcs)
1096 {
1097 struct ip6_sf_list *psf;
1098 int i, scount;
1099
1100 scount = 0;
1101 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1102 if (scount == nsrcs)
1103 break;
1104 for (i=0; i<nsrcs; i++) {
1105 /* skip inactive filters */
1106 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1107 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1108 psf->sf_count[MCAST_EXCLUDE])
1109 continue;
1110 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1111 scount++;
1112 break;
1113 }
1114 }
1115 }
1116 pmc->mca_flags &= ~MAF_GSQUERY;
1117 if (scount == nsrcs) /* all sources excluded */
1118 return 0;
1119 return 1;
1120 }
1121
1122 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1123 struct in6_addr *srcs)
1124 {
1125 struct ip6_sf_list *psf;
1126 int i, scount;
1127
1128 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1129 return mld_xmarksources(pmc, nsrcs, srcs);
1130
1131 /* mark INCLUDE-mode sources */
1132
1133 scount = 0;
1134 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1135 if (scount == nsrcs)
1136 break;
1137 for (i=0; i<nsrcs; i++) {
1138 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1139 psf->sf_gsresp = 1;
1140 scount++;
1141 break;
1142 }
1143 }
1144 }
1145 if (!scount) {
1146 pmc->mca_flags &= ~MAF_GSQUERY;
1147 return 0;
1148 }
1149 pmc->mca_flags |= MAF_GSQUERY;
1150 return 1;
1151 }
1152
1153 int igmp6_event_query(struct sk_buff *skb)
1154 {
1155 struct mld2_query *mlh2 = NULL;
1156 struct ifmcaddr6 *ma;
1157 struct in6_addr *group;
1158 unsigned long max_delay;
1159 struct inet6_dev *idev;
1160 struct icmp6hdr *hdr;
1161 int group_type;
1162 int mark = 0;
1163 int len;
1164
1165 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1166 return -EINVAL;
1167
1168 /* compute payload length excluding extension headers */
1169 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1170 len -= skb_network_header_len(skb);
1171
1172 /* Drop queries with not link local source */
1173 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1174 return -EINVAL;
1175
1176 idev = in6_dev_get(skb->dev);
1177
1178 if (idev == NULL)
1179 return 0;
1180
1181 hdr = icmp6_hdr(skb);
1182 group = (struct in6_addr *) (hdr + 1);
1183 group_type = ipv6_addr_type(group);
1184
1185 if (group_type != IPV6_ADDR_ANY &&
1186 !(group_type&IPV6_ADDR_MULTICAST)) {
1187 in6_dev_put(idev);
1188 return -EINVAL;
1189 }
1190
1191 if (len == 24) {
1192 int switchback;
1193 /* MLDv1 router present */
1194
1195 /* Translate milliseconds to jiffies */
1196 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1197
1198 switchback = (idev->mc_qrv + 1) * max_delay;
1199 idev->mc_v1_seen = jiffies + switchback;
1200
1201 /* cancel the interface change timer */
1202 idev->mc_ifc_count = 0;
1203 if (del_timer(&idev->mc_ifc_timer))
1204 __in6_dev_put(idev);
1205 /* clear deleted report items */
1206 mld_clear_delrec(idev);
1207 } else if (len >= 28) {
1208 int srcs_offset = sizeof(struct mld2_query) -
1209 sizeof(struct icmp6hdr);
1210 if (!pskb_may_pull(skb, srcs_offset)) {
1211 in6_dev_put(idev);
1212 return -EINVAL;
1213 }
1214 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1215 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1216 if (!max_delay)
1217 max_delay = 1;
1218 idev->mc_maxdelay = max_delay;
1219 if (mlh2->qrv)
1220 idev->mc_qrv = mlh2->qrv;
1221 if (group_type == IPV6_ADDR_ANY) { /* general query */
1222 if (mlh2->nsrcs) {
1223 in6_dev_put(idev);
1224 return -EINVAL; /* no sources allowed */
1225 }
1226 mld_gq_start_timer(idev);
1227 in6_dev_put(idev);
1228 return 0;
1229 }
1230 /* mark sources to include, if group & source-specific */
1231 if (mlh2->nsrcs != 0) {
1232 if (!pskb_may_pull(skb, srcs_offset +
1233 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1234 in6_dev_put(idev);
1235 return -EINVAL;
1236 }
1237 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1238 mark = 1;
1239 }
1240 } else {
1241 in6_dev_put(idev);
1242 return -EINVAL;
1243 }
1244
1245 read_lock_bh(&idev->lock);
1246 if (group_type == IPV6_ADDR_ANY) {
1247 for (ma = idev->mc_list; ma; ma=ma->next) {
1248 spin_lock_bh(&ma->mca_lock);
1249 igmp6_group_queried(ma, max_delay);
1250 spin_unlock_bh(&ma->mca_lock);
1251 }
1252 } else {
1253 for (ma = idev->mc_list; ma; ma=ma->next) {
1254 if (!ipv6_addr_equal(group, &ma->mca_addr))
1255 continue;
1256 spin_lock_bh(&ma->mca_lock);
1257 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1258 /* gsquery <- gsquery && mark */
1259 if (!mark)
1260 ma->mca_flags &= ~MAF_GSQUERY;
1261 } else {
1262 /* gsquery <- mark */
1263 if (mark)
1264 ma->mca_flags |= MAF_GSQUERY;
1265 else
1266 ma->mca_flags &= ~MAF_GSQUERY;
1267 }
1268 if (!(ma->mca_flags & MAF_GSQUERY) ||
1269 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1270 igmp6_group_queried(ma, max_delay);
1271 spin_unlock_bh(&ma->mca_lock);
1272 break;
1273 }
1274 }
1275 read_unlock_bh(&idev->lock);
1276 in6_dev_put(idev);
1277
1278 return 0;
1279 }
1280
1281
1282 int igmp6_event_report(struct sk_buff *skb)
1283 {
1284 struct ifmcaddr6 *ma;
1285 struct in6_addr *addrp;
1286 struct inet6_dev *idev;
1287 struct icmp6hdr *hdr;
1288 int addr_type;
1289
1290 /* Our own report looped back. Ignore it. */
1291 if (skb->pkt_type == PACKET_LOOPBACK)
1292 return 0;
1293
1294 /* send our report if the MC router may not have heard this report */
1295 if (skb->pkt_type != PACKET_MULTICAST &&
1296 skb->pkt_type != PACKET_BROADCAST)
1297 return 0;
1298
1299 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1300 return -EINVAL;
1301
1302 hdr = icmp6_hdr(skb);
1303
1304 /* Drop reports with not link local source */
1305 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1306 if (addr_type != IPV6_ADDR_ANY &&
1307 !(addr_type&IPV6_ADDR_LINKLOCAL))
1308 return -EINVAL;
1309
1310 addrp = (struct in6_addr *) (hdr + 1);
1311
1312 idev = in6_dev_get(skb->dev);
1313 if (idev == NULL)
1314 return -ENODEV;
1315
1316 /*
1317 * Cancel the timer for this group
1318 */
1319
1320 read_lock_bh(&idev->lock);
1321 for (ma = idev->mc_list; ma; ma=ma->next) {
1322 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1323 spin_lock(&ma->mca_lock);
1324 if (del_timer(&ma->mca_timer))
1325 atomic_dec(&ma->mca_refcnt);
1326 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1327 spin_unlock(&ma->mca_lock);
1328 break;
1329 }
1330 }
1331 read_unlock_bh(&idev->lock);
1332 in6_dev_put(idev);
1333 return 0;
1334 }
1335
1336 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1337 int gdeleted, int sdeleted)
1338 {
1339 switch (type) {
1340 case MLD2_MODE_IS_INCLUDE:
1341 case MLD2_MODE_IS_EXCLUDE:
1342 if (gdeleted || sdeleted)
1343 return 0;
1344 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1345 if (pmc->mca_sfmode == MCAST_INCLUDE)
1346 return 1;
1347 /* don't include if this source is excluded
1348 * in all filters
1349 */
1350 if (psf->sf_count[MCAST_INCLUDE])
1351 return type == MLD2_MODE_IS_INCLUDE;
1352 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1353 psf->sf_count[MCAST_EXCLUDE];
1354 }
1355 return 0;
1356 case MLD2_CHANGE_TO_INCLUDE:
1357 if (gdeleted || sdeleted)
1358 return 0;
1359 return psf->sf_count[MCAST_INCLUDE] != 0;
1360 case MLD2_CHANGE_TO_EXCLUDE:
1361 if (gdeleted || sdeleted)
1362 return 0;
1363 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1364 psf->sf_count[MCAST_INCLUDE])
1365 return 0;
1366 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1367 psf->sf_count[MCAST_EXCLUDE];
1368 case MLD2_ALLOW_NEW_SOURCES:
1369 if (gdeleted || !psf->sf_crcount)
1370 return 0;
1371 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1372 case MLD2_BLOCK_OLD_SOURCES:
1373 if (pmc->mca_sfmode == MCAST_INCLUDE)
1374 return gdeleted || (psf->sf_crcount && sdeleted);
1375 return psf->sf_crcount && !gdeleted && !sdeleted;
1376 }
1377 return 0;
1378 }
1379
1380 static int
1381 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1382 {
1383 struct ip6_sf_list *psf;
1384 int scount = 0;
1385
1386 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1387 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1388 continue;
1389 scount++;
1390 }
1391 return scount;
1392 }
1393
1394 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1395 {
1396 struct sock *sk = igmp6_socket->sk;
1397 struct sk_buff *skb;
1398 struct mld2_report *pmr;
1399 struct in6_addr addr_buf;
1400 int err;
1401 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1402 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1403 IPV6_TLV_PADN, 0 };
1404
1405 /* we assume size > sizeof(ra) here */
1406 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1407
1408 if (!skb)
1409 return NULL;
1410
1411 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1412
1413 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1414 /* <draft-ietf-magma-mld-source-05.txt>:
1415 * use unspecified address as the source address
1416 * when a valid link-local address is not available.
1417 */
1418 memset(&addr_buf, 0, sizeof(addr_buf));
1419 }
1420
1421 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1422
1423 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1424
1425 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1426 skb_put(skb, sizeof(*pmr));
1427 pmr = (struct mld2_report *)skb_transport_header(skb);
1428 pmr->type = ICMPV6_MLD2_REPORT;
1429 pmr->resv1 = 0;
1430 pmr->csum = 0;
1431 pmr->resv2 = 0;
1432 pmr->ngrec = 0;
1433 return skb;
1434 }
1435
1436 static void mld_sendpack(struct sk_buff *skb)
1437 {
1438 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1439 struct mld2_report *pmr =
1440 (struct mld2_report *)skb_transport_header(skb);
1441 int payload_len, mldlen;
1442 struct inet6_dev *idev = in6_dev_get(skb->dev);
1443 int err;
1444 struct flowi fl;
1445
1446 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1447 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1448 mldlen = skb->tail - skb->transport_header;
1449 pip6->payload_len = htons(payload_len);
1450
1451 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1452 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1453 mldlen, 0));
1454
1455 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1456
1457 if (!skb->dst) {
1458 err = -ENOMEM;
1459 goto err_out;
1460 }
1461
1462 icmpv6_flow_init(igmp6_socket->sk, &fl, ICMPV6_MLD2_REPORT,
1463 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1464 skb->dev->ifindex);
1465
1466 err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1467 if (err)
1468 goto err_out;
1469
1470 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1471 dst_output);
1472 out:
1473 if (!err) {
1474 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1475 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1476 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1477 } else
1478 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1479
1480 if (likely(idev != NULL))
1481 in6_dev_put(idev);
1482 return;
1483
1484 err_out:
1485 kfree_skb(skb);
1486 goto out;
1487 }
1488
1489 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1490 {
1491 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1492 }
1493
1494 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1495 int type, struct mld2_grec **ppgr)
1496 {
1497 struct net_device *dev = pmc->idev->dev;
1498 struct mld2_report *pmr;
1499 struct mld2_grec *pgr;
1500
1501 if (!skb)
1502 skb = mld_newpack(dev, dev->mtu);
1503 if (!skb)
1504 return NULL;
1505 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1506 pgr->grec_type = type;
1507 pgr->grec_auxwords = 0;
1508 pgr->grec_nsrcs = 0;
1509 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1510 pmr = (struct mld2_report *)skb_transport_header(skb);
1511 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1512 *ppgr = pgr;
1513 return skb;
1514 }
1515
1516 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1517 skb_tailroom(skb)) : 0)
1518
1519 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1520 int type, int gdeleted, int sdeleted)
1521 {
1522 struct net_device *dev = pmc->idev->dev;
1523 struct mld2_report *pmr;
1524 struct mld2_grec *pgr = NULL;
1525 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1526 int scount, stotal, first, isquery, truncate;
1527
1528 if (pmc->mca_flags & MAF_NOREPORT)
1529 return skb;
1530
1531 isquery = type == MLD2_MODE_IS_INCLUDE ||
1532 type == MLD2_MODE_IS_EXCLUDE;
1533 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1534 type == MLD2_CHANGE_TO_EXCLUDE;
1535
1536 stotal = scount = 0;
1537
1538 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1539
1540 if (!*psf_list)
1541 goto empty_source;
1542
1543 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1544
1545 /* EX and TO_EX get a fresh packet, if needed */
1546 if (truncate) {
1547 if (pmr && pmr->ngrec &&
1548 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1549 if (skb)
1550 mld_sendpack(skb);
1551 skb = mld_newpack(dev, dev->mtu);
1552 }
1553 }
1554 first = 1;
1555 psf_prev = NULL;
1556 for (psf=*psf_list; psf; psf=psf_next) {
1557 struct in6_addr *psrc;
1558
1559 psf_next = psf->sf_next;
1560
1561 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1562 psf_prev = psf;
1563 continue;
1564 }
1565
1566 /* clear marks on query responses */
1567 if (isquery)
1568 psf->sf_gsresp = 0;
1569
1570 if (AVAILABLE(skb) < sizeof(*psrc) +
1571 first*sizeof(struct mld2_grec)) {
1572 if (truncate && !first)
1573 break; /* truncate these */
1574 if (pgr)
1575 pgr->grec_nsrcs = htons(scount);
1576 if (skb)
1577 mld_sendpack(skb);
1578 skb = mld_newpack(dev, dev->mtu);
1579 first = 1;
1580 scount = 0;
1581 }
1582 if (first) {
1583 skb = add_grhead(skb, pmc, type, &pgr);
1584 first = 0;
1585 }
1586 if (!skb)
1587 return NULL;
1588 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1589 *psrc = psf->sf_addr;
1590 scount++; stotal++;
1591 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1592 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1593 psf->sf_crcount--;
1594 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1595 if (psf_prev)
1596 psf_prev->sf_next = psf->sf_next;
1597 else
1598 *psf_list = psf->sf_next;
1599 kfree(psf);
1600 continue;
1601 }
1602 }
1603 psf_prev = psf;
1604 }
1605
1606 empty_source:
1607 if (!stotal) {
1608 if (type == MLD2_ALLOW_NEW_SOURCES ||
1609 type == MLD2_BLOCK_OLD_SOURCES)
1610 return skb;
1611 if (pmc->mca_crcount || isquery) {
1612 /* make sure we have room for group header */
1613 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1614 mld_sendpack(skb);
1615 skb = NULL; /* add_grhead will get a new one */
1616 }
1617 skb = add_grhead(skb, pmc, type, &pgr);
1618 }
1619 }
1620 if (pgr)
1621 pgr->grec_nsrcs = htons(scount);
1622
1623 if (isquery)
1624 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1625 return skb;
1626 }
1627
1628 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1629 {
1630 struct sk_buff *skb = NULL;
1631 int type;
1632
1633 if (!pmc) {
1634 read_lock_bh(&idev->lock);
1635 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1636 if (pmc->mca_flags & MAF_NOREPORT)
1637 continue;
1638 spin_lock_bh(&pmc->mca_lock);
1639 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1640 type = MLD2_MODE_IS_EXCLUDE;
1641 else
1642 type = MLD2_MODE_IS_INCLUDE;
1643 skb = add_grec(skb, pmc, type, 0, 0);
1644 spin_unlock_bh(&pmc->mca_lock);
1645 }
1646 read_unlock_bh(&idev->lock);
1647 } else {
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 if (skb)
1657 mld_sendpack(skb);
1658 }
1659
1660 /*
1661 * remove zero-count source records from a source filter list
1662 */
1663 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1664 {
1665 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1666
1667 psf_prev = NULL;
1668 for (psf=*ppsf; psf; psf = psf_next) {
1669 psf_next = psf->sf_next;
1670 if (psf->sf_crcount == 0) {
1671 if (psf_prev)
1672 psf_prev->sf_next = psf->sf_next;
1673 else
1674 *ppsf = psf->sf_next;
1675 kfree(psf);
1676 } else
1677 psf_prev = psf;
1678 }
1679 }
1680
1681 static void mld_send_cr(struct inet6_dev *idev)
1682 {
1683 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1684 struct sk_buff *skb = NULL;
1685 int type, dtype;
1686
1687 read_lock_bh(&idev->lock);
1688 write_lock_bh(&idev->mc_lock);
1689
1690 /* deleted MCA's */
1691 pmc_prev = NULL;
1692 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1693 pmc_next = pmc->next;
1694 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1695 type = MLD2_BLOCK_OLD_SOURCES;
1696 dtype = MLD2_BLOCK_OLD_SOURCES;
1697 skb = add_grec(skb, pmc, type, 1, 0);
1698 skb = add_grec(skb, pmc, dtype, 1, 1);
1699 }
1700 if (pmc->mca_crcount) {
1701 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1702 type = MLD2_CHANGE_TO_INCLUDE;
1703 skb = add_grec(skb, pmc, type, 1, 0);
1704 }
1705 pmc->mca_crcount--;
1706 if (pmc->mca_crcount == 0) {
1707 mld_clear_zeros(&pmc->mca_tomb);
1708 mld_clear_zeros(&pmc->mca_sources);
1709 }
1710 }
1711 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1712 !pmc->mca_sources) {
1713 if (pmc_prev)
1714 pmc_prev->next = pmc_next;
1715 else
1716 idev->mc_tomb = pmc_next;
1717 in6_dev_put(pmc->idev);
1718 kfree(pmc);
1719 } else
1720 pmc_prev = pmc;
1721 }
1722 write_unlock_bh(&idev->mc_lock);
1723
1724 /* change recs */
1725 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1726 spin_lock_bh(&pmc->mca_lock);
1727 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1728 type = MLD2_BLOCK_OLD_SOURCES;
1729 dtype = MLD2_ALLOW_NEW_SOURCES;
1730 } else {
1731 type = MLD2_ALLOW_NEW_SOURCES;
1732 dtype = MLD2_BLOCK_OLD_SOURCES;
1733 }
1734 skb = add_grec(skb, pmc, type, 0, 0);
1735 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1736
1737 /* filter mode changes */
1738 if (pmc->mca_crcount) {
1739 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1740 type = MLD2_CHANGE_TO_EXCLUDE;
1741 else
1742 type = MLD2_CHANGE_TO_INCLUDE;
1743 skb = add_grec(skb, pmc, type, 0, 0);
1744 pmc->mca_crcount--;
1745 }
1746 spin_unlock_bh(&pmc->mca_lock);
1747 }
1748 read_unlock_bh(&idev->lock);
1749 if (!skb)
1750 return;
1751 (void) mld_sendpack(skb);
1752 }
1753
1754 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1755 {
1756 struct sock *sk = igmp6_socket->sk;
1757 struct inet6_dev *idev;
1758 struct sk_buff *skb;
1759 struct icmp6hdr *hdr;
1760 struct in6_addr *snd_addr;
1761 struct in6_addr *addrp;
1762 struct in6_addr addr_buf;
1763 struct in6_addr all_routers;
1764 int err, len, payload_len, full_len;
1765 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1766 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1767 IPV6_TLV_PADN, 0 };
1768 struct flowi fl;
1769
1770 rcu_read_lock();
1771 IP6_INC_STATS(__in6_dev_get(dev),
1772 IPSTATS_MIB_OUTREQUESTS);
1773 rcu_read_unlock();
1774 snd_addr = addr;
1775 if (type == ICMPV6_MGM_REDUCTION) {
1776 snd_addr = &all_routers;
1777 ipv6_addr_all_routers(&all_routers);
1778 }
1779
1780 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1781 payload_len = len + sizeof(ra);
1782 full_len = sizeof(struct ipv6hdr) + payload_len;
1783
1784 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1785
1786 if (skb == NULL) {
1787 rcu_read_lock();
1788 IP6_INC_STATS(__in6_dev_get(dev),
1789 IPSTATS_MIB_OUTDISCARDS);
1790 rcu_read_unlock();
1791 return;
1792 }
1793
1794 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1795
1796 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1797 /* <draft-ietf-magma-mld-source-05.txt>:
1798 * use unspecified address as the source address
1799 * when a valid link-local address is not available.
1800 */
1801 memset(&addr_buf, 0, sizeof(addr_buf));
1802 }
1803
1804 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1805
1806 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1807
1808 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1809 memset(hdr, 0, sizeof(struct icmp6hdr));
1810 hdr->icmp6_type = type;
1811
1812 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1813 ipv6_addr_copy(addrp, addr);
1814
1815 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1816 IPPROTO_ICMPV6,
1817 csum_partial((__u8 *) hdr, len, 0));
1818
1819 idev = in6_dev_get(skb->dev);
1820
1821 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1822 if (!skb->dst) {
1823 err = -ENOMEM;
1824 goto err_out;
1825 }
1826
1827 icmpv6_flow_init(igmp6_socket->sk, &fl, type,
1828 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1829 skb->dev->ifindex);
1830
1831 err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1832 if (err)
1833 goto err_out;
1834
1835 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1836 dst_output);
1837 out:
1838 if (!err) {
1839 ICMP6MSGOUT_INC_STATS(idev, type);
1840 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1841 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1842 } else
1843 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1844
1845 if (likely(idev != NULL))
1846 in6_dev_put(idev);
1847 return;
1848
1849 err_out:
1850 kfree_skb(skb);
1851 goto out;
1852 }
1853
1854 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1855 struct in6_addr *psfsrc)
1856 {
1857 struct ip6_sf_list *psf, *psf_prev;
1858 int rv = 0;
1859
1860 psf_prev = NULL;
1861 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1862 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1863 break;
1864 psf_prev = psf;
1865 }
1866 if (!psf || psf->sf_count[sfmode] == 0) {
1867 /* source filter not found, or count wrong => bug */
1868 return -ESRCH;
1869 }
1870 psf->sf_count[sfmode]--;
1871 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1872 struct inet6_dev *idev = pmc->idev;
1873
1874 /* no more filters for this source */
1875 if (psf_prev)
1876 psf_prev->sf_next = psf->sf_next;
1877 else
1878 pmc->mca_sources = psf->sf_next;
1879 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1880 !MLD_V1_SEEN(idev)) {
1881 psf->sf_crcount = idev->mc_qrv;
1882 psf->sf_next = pmc->mca_tomb;
1883 pmc->mca_tomb = psf;
1884 rv = 1;
1885 } else
1886 kfree(psf);
1887 }
1888 return rv;
1889 }
1890
1891 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1892 int sfmode, int sfcount, struct in6_addr *psfsrc,
1893 int delta)
1894 {
1895 struct ifmcaddr6 *pmc;
1896 int changerec = 0;
1897 int i, err;
1898
1899 if (!idev)
1900 return -ENODEV;
1901 read_lock_bh(&idev->lock);
1902 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1903 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1904 break;
1905 }
1906 if (!pmc) {
1907 /* MCA not found?? bug */
1908 read_unlock_bh(&idev->lock);
1909 return -ESRCH;
1910 }
1911 spin_lock_bh(&pmc->mca_lock);
1912 sf_markstate(pmc);
1913 if (!delta) {
1914 if (!pmc->mca_sfcount[sfmode]) {
1915 spin_unlock_bh(&pmc->mca_lock);
1916 read_unlock_bh(&idev->lock);
1917 return -EINVAL;
1918 }
1919 pmc->mca_sfcount[sfmode]--;
1920 }
1921 err = 0;
1922 for (i=0; i<sfcount; i++) {
1923 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1924
1925 changerec |= rv > 0;
1926 if (!err && rv < 0)
1927 err = rv;
1928 }
1929 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1930 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1931 pmc->mca_sfcount[MCAST_INCLUDE]) {
1932 struct ip6_sf_list *psf;
1933
1934 /* filter mode change */
1935 pmc->mca_sfmode = MCAST_INCLUDE;
1936 pmc->mca_crcount = idev->mc_qrv;
1937 idev->mc_ifc_count = pmc->mca_crcount;
1938 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1939 psf->sf_crcount = 0;
1940 mld_ifc_event(pmc->idev);
1941 } else if (sf_setstate(pmc) || changerec)
1942 mld_ifc_event(pmc->idev);
1943 spin_unlock_bh(&pmc->mca_lock);
1944 read_unlock_bh(&idev->lock);
1945 return err;
1946 }
1947
1948 /*
1949 * Add multicast single-source filter to the interface list
1950 */
1951 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1952 struct in6_addr *psfsrc, int delta)
1953 {
1954 struct ip6_sf_list *psf, *psf_prev;
1955
1956 psf_prev = NULL;
1957 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1958 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1959 break;
1960 psf_prev = psf;
1961 }
1962 if (!psf) {
1963 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1964 if (!psf)
1965 return -ENOBUFS;
1966
1967 psf->sf_addr = *psfsrc;
1968 if (psf_prev) {
1969 psf_prev->sf_next = psf;
1970 } else
1971 pmc->mca_sources = psf;
1972 }
1973 psf->sf_count[sfmode]++;
1974 return 0;
1975 }
1976
1977 static void sf_markstate(struct ifmcaddr6 *pmc)
1978 {
1979 struct ip6_sf_list *psf;
1980 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1981
1982 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1983 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1984 psf->sf_oldin = mca_xcount ==
1985 psf->sf_count[MCAST_EXCLUDE] &&
1986 !psf->sf_count[MCAST_INCLUDE];
1987 } else
1988 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1989 }
1990
1991 static int sf_setstate(struct ifmcaddr6 *pmc)
1992 {
1993 struct ip6_sf_list *psf, *dpsf;
1994 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1995 int qrv = pmc->idev->mc_qrv;
1996 int new_in, rv;
1997
1998 rv = 0;
1999 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2000 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2001 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2002 !psf->sf_count[MCAST_INCLUDE];
2003 } else
2004 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2005 if (new_in) {
2006 if (!psf->sf_oldin) {
2007 struct ip6_sf_list *prev = NULL;
2008
2009 for (dpsf=pmc->mca_tomb; dpsf;
2010 dpsf=dpsf->sf_next) {
2011 if (ipv6_addr_equal(&dpsf->sf_addr,
2012 &psf->sf_addr))
2013 break;
2014 prev = dpsf;
2015 }
2016 if (dpsf) {
2017 if (prev)
2018 prev->sf_next = dpsf->sf_next;
2019 else
2020 pmc->mca_tomb = dpsf->sf_next;
2021 kfree(dpsf);
2022 }
2023 psf->sf_crcount = qrv;
2024 rv++;
2025 }
2026 } else if (psf->sf_oldin) {
2027 psf->sf_crcount = 0;
2028 /*
2029 * add or update "delete" records if an active filter
2030 * is now inactive
2031 */
2032 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2033 if (ipv6_addr_equal(&dpsf->sf_addr,
2034 &psf->sf_addr))
2035 break;
2036 if (!dpsf) {
2037 dpsf = (struct ip6_sf_list *)
2038 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2039 if (!dpsf)
2040 continue;
2041 *dpsf = *psf;
2042 /* pmc->mca_lock held by callers */
2043 dpsf->sf_next = pmc->mca_tomb;
2044 pmc->mca_tomb = dpsf;
2045 }
2046 dpsf->sf_crcount = qrv;
2047 rv++;
2048 }
2049 }
2050 return rv;
2051 }
2052
2053 /*
2054 * Add multicast source filter list to the interface list
2055 */
2056 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2057 int sfmode, int sfcount, struct in6_addr *psfsrc,
2058 int delta)
2059 {
2060 struct ifmcaddr6 *pmc;
2061 int isexclude;
2062 int i, err;
2063
2064 if (!idev)
2065 return -ENODEV;
2066 read_lock_bh(&idev->lock);
2067 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2068 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2069 break;
2070 }
2071 if (!pmc) {
2072 /* MCA not found?? bug */
2073 read_unlock_bh(&idev->lock);
2074 return -ESRCH;
2075 }
2076 spin_lock_bh(&pmc->mca_lock);
2077
2078 sf_markstate(pmc);
2079 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2080 if (!delta)
2081 pmc->mca_sfcount[sfmode]++;
2082 err = 0;
2083 for (i=0; i<sfcount; i++) {
2084 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2085 if (err)
2086 break;
2087 }
2088 if (err) {
2089 int j;
2090
2091 if (!delta)
2092 pmc->mca_sfcount[sfmode]--;
2093 for (j=0; j<i; j++)
2094 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2095 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2096 struct inet6_dev *idev = pmc->idev;
2097 struct ip6_sf_list *psf;
2098
2099 /* filter mode change */
2100 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2101 pmc->mca_sfmode = MCAST_EXCLUDE;
2102 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2103 pmc->mca_sfmode = MCAST_INCLUDE;
2104 /* else no filters; keep old mode for reports */
2105
2106 pmc->mca_crcount = idev->mc_qrv;
2107 idev->mc_ifc_count = pmc->mca_crcount;
2108 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2109 psf->sf_crcount = 0;
2110 mld_ifc_event(idev);
2111 } else if (sf_setstate(pmc))
2112 mld_ifc_event(idev);
2113 spin_unlock_bh(&pmc->mca_lock);
2114 read_unlock_bh(&idev->lock);
2115 return err;
2116 }
2117
2118 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2119 {
2120 struct ip6_sf_list *psf, *nextpsf;
2121
2122 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2123 nextpsf = psf->sf_next;
2124 kfree(psf);
2125 }
2126 pmc->mca_tomb = NULL;
2127 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2128 nextpsf = psf->sf_next;
2129 kfree(psf);
2130 }
2131 pmc->mca_sources = NULL;
2132 pmc->mca_sfmode = MCAST_EXCLUDE;
2133 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2134 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2135 }
2136
2137
2138 static void igmp6_join_group(struct ifmcaddr6 *ma)
2139 {
2140 unsigned long delay;
2141
2142 if (ma->mca_flags & MAF_NOREPORT)
2143 return;
2144
2145 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2146
2147 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2148
2149 spin_lock_bh(&ma->mca_lock);
2150 if (del_timer(&ma->mca_timer)) {
2151 atomic_dec(&ma->mca_refcnt);
2152 delay = ma->mca_timer.expires - jiffies;
2153 }
2154
2155 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2156 atomic_inc(&ma->mca_refcnt);
2157 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2158 spin_unlock_bh(&ma->mca_lock);
2159 }
2160
2161 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2162 struct inet6_dev *idev)
2163 {
2164 int err;
2165
2166 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2167 * so no other readers or writers of iml or its sflist
2168 */
2169 if (!iml->sflist) {
2170 /* any-source empty exclude case */
2171 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2172 }
2173 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2174 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2175 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2176 iml->sflist = NULL;
2177 return err;
2178 }
2179
2180 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2181 {
2182 if (MLD_V1_SEEN(ma->idev)) {
2183 if (ma->mca_flags & MAF_LAST_REPORTER)
2184 igmp6_send(&ma->mca_addr, ma->idev->dev,
2185 ICMPV6_MGM_REDUCTION);
2186 } else {
2187 mld_add_delrec(ma->idev, ma);
2188 mld_ifc_event(ma->idev);
2189 }
2190 }
2191
2192 static void mld_gq_timer_expire(unsigned long data)
2193 {
2194 struct inet6_dev *idev = (struct inet6_dev *)data;
2195
2196 idev->mc_gq_running = 0;
2197 mld_send_report(idev, NULL);
2198 __in6_dev_put(idev);
2199 }
2200
2201 static void mld_ifc_timer_expire(unsigned long data)
2202 {
2203 struct inet6_dev *idev = (struct inet6_dev *)data;
2204
2205 mld_send_cr(idev);
2206 if (idev->mc_ifc_count) {
2207 idev->mc_ifc_count--;
2208 if (idev->mc_ifc_count)
2209 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2210 }
2211 __in6_dev_put(idev);
2212 }
2213
2214 static void mld_ifc_event(struct inet6_dev *idev)
2215 {
2216 if (MLD_V1_SEEN(idev))
2217 return;
2218 idev->mc_ifc_count = idev->mc_qrv;
2219 mld_ifc_start_timer(idev, 1);
2220 }
2221
2222
2223 static void igmp6_timer_handler(unsigned long data)
2224 {
2225 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2226
2227 if (MLD_V1_SEEN(ma->idev))
2228 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2229 else
2230 mld_send_report(ma->idev, ma);
2231
2232 spin_lock(&ma->mca_lock);
2233 ma->mca_flags |= MAF_LAST_REPORTER;
2234 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2235 spin_unlock(&ma->mca_lock);
2236 ma_put(ma);
2237 }
2238
2239 /* Device going down */
2240
2241 void ipv6_mc_down(struct inet6_dev *idev)
2242 {
2243 struct ifmcaddr6 *i;
2244
2245 /* Withdraw multicast list */
2246
2247 read_lock_bh(&idev->lock);
2248 idev->mc_ifc_count = 0;
2249 if (del_timer(&idev->mc_ifc_timer))
2250 __in6_dev_put(idev);
2251 idev->mc_gq_running = 0;
2252 if (del_timer(&idev->mc_gq_timer))
2253 __in6_dev_put(idev);
2254
2255 for (i = idev->mc_list; i; i=i->next)
2256 igmp6_group_dropped(i);
2257 read_unlock_bh(&idev->lock);
2258
2259 mld_clear_delrec(idev);
2260 }
2261
2262
2263 /* Device going up */
2264
2265 void ipv6_mc_up(struct inet6_dev *idev)
2266 {
2267 struct ifmcaddr6 *i;
2268
2269 /* Install multicast list, except for all-nodes (already installed) */
2270
2271 read_lock_bh(&idev->lock);
2272 for (i = idev->mc_list; i; i=i->next)
2273 igmp6_group_added(i);
2274 read_unlock_bh(&idev->lock);
2275 }
2276
2277 /* IPv6 device initialization. */
2278
2279 void ipv6_mc_init_dev(struct inet6_dev *idev)
2280 {
2281 write_lock_bh(&idev->lock);
2282 rwlock_init(&idev->mc_lock);
2283 idev->mc_gq_running = 0;
2284 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2285 (unsigned long)idev);
2286 idev->mc_tomb = NULL;
2287 idev->mc_ifc_count = 0;
2288 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2289 (unsigned long)idev);
2290 idev->mc_qrv = MLD_QRV_DEFAULT;
2291 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2292 idev->mc_v1_seen = 0;
2293 write_unlock_bh(&idev->lock);
2294 }
2295
2296 /*
2297 * Device is about to be destroyed: clean up.
2298 */
2299
2300 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2301 {
2302 struct ifmcaddr6 *i;
2303 struct in6_addr maddr;
2304
2305 /* Deactivate timers */
2306 ipv6_mc_down(idev);
2307
2308 /* Delete all-nodes address. */
2309 ipv6_addr_all_nodes(&maddr);
2310
2311 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2312 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2313 * fail.
2314 */
2315 __ipv6_dev_mc_dec(idev, &maddr);
2316
2317 if (idev->cnf.forwarding) {
2318 ipv6_addr_all_routers(&maddr);
2319 __ipv6_dev_mc_dec(idev, &maddr);
2320 }
2321
2322 write_lock_bh(&idev->lock);
2323 while ((i = idev->mc_list) != NULL) {
2324 idev->mc_list = i->next;
2325 write_unlock_bh(&idev->lock);
2326
2327 igmp6_group_dropped(i);
2328 ma_put(i);
2329
2330 write_lock_bh(&idev->lock);
2331 }
2332 write_unlock_bh(&idev->lock);
2333 }
2334
2335 #ifdef CONFIG_PROC_FS
2336 struct igmp6_mc_iter_state {
2337 struct net_device *dev;
2338 struct inet6_dev *idev;
2339 };
2340
2341 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2342
2343 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2344 {
2345 struct ifmcaddr6 *im = NULL;
2346 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2347
2348 state->idev = NULL;
2349 for_each_netdev(&init_net, state->dev) {
2350 struct inet6_dev *idev;
2351 idev = in6_dev_get(state->dev);
2352 if (!idev)
2353 continue;
2354 read_lock_bh(&idev->lock);
2355 im = idev->mc_list;
2356 if (im) {
2357 state->idev = idev;
2358 break;
2359 }
2360 read_unlock_bh(&idev->lock);
2361 in6_dev_put(idev);
2362 }
2363 return im;
2364 }
2365
2366 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2367 {
2368 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2369
2370 im = im->next;
2371 while (!im) {
2372 if (likely(state->idev != NULL)) {
2373 read_unlock_bh(&state->idev->lock);
2374 in6_dev_put(state->idev);
2375 }
2376 state->dev = next_net_device(state->dev);
2377 if (!state->dev) {
2378 state->idev = NULL;
2379 break;
2380 }
2381 state->idev = in6_dev_get(state->dev);
2382 if (!state->idev)
2383 continue;
2384 read_lock_bh(&state->idev->lock);
2385 im = state->idev->mc_list;
2386 }
2387 return im;
2388 }
2389
2390 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2391 {
2392 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2393 if (im)
2394 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2395 --pos;
2396 return pos ? NULL : im;
2397 }
2398
2399 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2400 __acquires(dev_base_lock)
2401 {
2402 read_lock(&dev_base_lock);
2403 return igmp6_mc_get_idx(seq, *pos);
2404 }
2405
2406 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2407 {
2408 struct ifmcaddr6 *im;
2409 im = igmp6_mc_get_next(seq, v);
2410 ++*pos;
2411 return im;
2412 }
2413
2414 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2415 __releases(dev_base_lock)
2416 {
2417 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2418 if (likely(state->idev != NULL)) {
2419 read_unlock_bh(&state->idev->lock);
2420 in6_dev_put(state->idev);
2421 state->idev = NULL;
2422 }
2423 state->dev = NULL;
2424 read_unlock(&dev_base_lock);
2425 }
2426
2427 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2428 {
2429 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2430 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2431
2432 seq_printf(seq,
2433 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2434 state->dev->ifindex, state->dev->name,
2435 NIP6(im->mca_addr),
2436 im->mca_users, im->mca_flags,
2437 (im->mca_flags&MAF_TIMER_RUNNING) ?
2438 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2439 return 0;
2440 }
2441
2442 static const struct seq_operations igmp6_mc_seq_ops = {
2443 .start = igmp6_mc_seq_start,
2444 .next = igmp6_mc_seq_next,
2445 .stop = igmp6_mc_seq_stop,
2446 .show = igmp6_mc_seq_show,
2447 };
2448
2449 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2450 {
2451 return seq_open_private(file, &igmp6_mc_seq_ops,
2452 sizeof(struct igmp6_mc_iter_state));
2453 }
2454
2455 static const struct file_operations igmp6_mc_seq_fops = {
2456 .owner = THIS_MODULE,
2457 .open = igmp6_mc_seq_open,
2458 .read = seq_read,
2459 .llseek = seq_lseek,
2460 .release = seq_release_private,
2461 };
2462
2463 struct igmp6_mcf_iter_state {
2464 struct net_device *dev;
2465 struct inet6_dev *idev;
2466 struct ifmcaddr6 *im;
2467 };
2468
2469 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2470
2471 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2472 {
2473 struct ip6_sf_list *psf = NULL;
2474 struct ifmcaddr6 *im = NULL;
2475 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2476
2477 state->idev = NULL;
2478 state->im = NULL;
2479 for_each_netdev(&init_net, state->dev) {
2480 struct inet6_dev *idev;
2481 idev = in6_dev_get(state->dev);
2482 if (unlikely(idev == NULL))
2483 continue;
2484 read_lock_bh(&idev->lock);
2485 im = idev->mc_list;
2486 if (likely(im != NULL)) {
2487 spin_lock_bh(&im->mca_lock);
2488 psf = im->mca_sources;
2489 if (likely(psf != NULL)) {
2490 state->im = im;
2491 state->idev = idev;
2492 break;
2493 }
2494 spin_unlock_bh(&im->mca_lock);
2495 }
2496 read_unlock_bh(&idev->lock);
2497 in6_dev_put(idev);
2498 }
2499 return psf;
2500 }
2501
2502 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2503 {
2504 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2505
2506 psf = psf->sf_next;
2507 while (!psf) {
2508 spin_unlock_bh(&state->im->mca_lock);
2509 state->im = state->im->next;
2510 while (!state->im) {
2511 if (likely(state->idev != NULL)) {
2512 read_unlock_bh(&state->idev->lock);
2513 in6_dev_put(state->idev);
2514 }
2515 state->dev = next_net_device(state->dev);
2516 if (!state->dev) {
2517 state->idev = NULL;
2518 goto out;
2519 }
2520 state->idev = in6_dev_get(state->dev);
2521 if (!state->idev)
2522 continue;
2523 read_lock_bh(&state->idev->lock);
2524 state->im = state->idev->mc_list;
2525 }
2526 if (!state->im)
2527 break;
2528 spin_lock_bh(&state->im->mca_lock);
2529 psf = state->im->mca_sources;
2530 }
2531 out:
2532 return psf;
2533 }
2534
2535 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2536 {
2537 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2538 if (psf)
2539 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2540 --pos;
2541 return pos ? NULL : psf;
2542 }
2543
2544 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2545 __acquires(dev_base_lock)
2546 {
2547 read_lock(&dev_base_lock);
2548 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2549 }
2550
2551 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2552 {
2553 struct ip6_sf_list *psf;
2554 if (v == SEQ_START_TOKEN)
2555 psf = igmp6_mcf_get_first(seq);
2556 else
2557 psf = igmp6_mcf_get_next(seq, v);
2558 ++*pos;
2559 return psf;
2560 }
2561
2562 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2563 __releases(dev_base_lock)
2564 {
2565 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2566 if (likely(state->im != NULL)) {
2567 spin_unlock_bh(&state->im->mca_lock);
2568 state->im = NULL;
2569 }
2570 if (likely(state->idev != NULL)) {
2571 read_unlock_bh(&state->idev->lock);
2572 in6_dev_put(state->idev);
2573 state->idev = NULL;
2574 }
2575 state->dev = NULL;
2576 read_unlock(&dev_base_lock);
2577 }
2578
2579 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2580 {
2581 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2582 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2583
2584 if (v == SEQ_START_TOKEN) {
2585 seq_printf(seq,
2586 "%3s %6s "
2587 "%32s %32s %6s %6s\n", "Idx",
2588 "Device", "Multicast Address",
2589 "Source Address", "INC", "EXC");
2590 } else {
2591 seq_printf(seq,
2592 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2593 state->dev->ifindex, state->dev->name,
2594 NIP6(state->im->mca_addr),
2595 NIP6(psf->sf_addr),
2596 psf->sf_count[MCAST_INCLUDE],
2597 psf->sf_count[MCAST_EXCLUDE]);
2598 }
2599 return 0;
2600 }
2601
2602 static const struct seq_operations igmp6_mcf_seq_ops = {
2603 .start = igmp6_mcf_seq_start,
2604 .next = igmp6_mcf_seq_next,
2605 .stop = igmp6_mcf_seq_stop,
2606 .show = igmp6_mcf_seq_show,
2607 };
2608
2609 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2610 {
2611 return seq_open_private(file, &igmp6_mcf_seq_ops,
2612 sizeof(struct igmp6_mcf_iter_state));
2613 }
2614
2615 static const struct file_operations igmp6_mcf_seq_fops = {
2616 .owner = THIS_MODULE,
2617 .open = igmp6_mcf_seq_open,
2618 .read = seq_read,
2619 .llseek = seq_lseek,
2620 .release = seq_release_private,
2621 };
2622 #endif
2623
2624 int __init igmp6_init(void)
2625 {
2626 struct ipv6_pinfo *np;
2627 struct sock *sk;
2628 int err;
2629
2630 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2631 if (err < 0) {
2632 printk(KERN_ERR
2633 "Failed to initialize the IGMP6 control socket (err %d).\n",
2634 err);
2635 igmp6_socket = NULL; /* For safety. */
2636 return err;
2637 }
2638
2639 sk = igmp6_socket->sk;
2640 sk->sk_allocation = GFP_ATOMIC;
2641 sk->sk_prot->unhash(sk);
2642
2643 np = inet6_sk(sk);
2644 np->hop_limit = 1;
2645
2646 #ifdef CONFIG_PROC_FS
2647 proc_net_fops_create(&init_net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2648 proc_net_fops_create(&init_net, "mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2649 #endif
2650
2651 return 0;
2652 }
2653
2654 void igmp6_cleanup(void)
2655 {
2656 sock_release(igmp6_socket);
2657 igmp6_socket = NULL; /* for safety */
2658
2659 #ifdef CONFIG_PROC_FS
2660 proc_net_remove(&init_net, "mcfilter6");
2661 proc_net_remove(&init_net, "igmp6");
2662 #endif
2663 }
CJK support for tty framebuffer vt