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fed up with those stupid warnings
[mmotm.git] / net / ipv6 / mcast.c
blobf9fcf690bd5d60781f7c9c1d9e152eafb6712367
1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46
47 #include <linux/netfilter.h>
48 #include <linux/netfilter_ipv6.h>
49
50 #include <net/net_namespace.h>
51 #include <net/sock.h>
52 #include <net/snmp.h>
53
54 #include <net/ipv6.h>
55 #include <net/protocol.h>
56 #include <net/if_inet6.h>
57 #include <net/ndisc.h>
58 #include <net/addrconf.h>
59 #include <net/ip6_route.h>
60 #include <net/inet_common.h>
61
62 #include <net/ip6_checksum.h>
63
64 /* Set to 3 to get tracing... */
65 #define MCAST_DEBUG 2
66
67 #if MCAST_DEBUG >= 3
68 #define MDBG(x) printk x
69 #else
70 #define MDBG(x)
71 #endif
72
73 /*
74 * These header formats should be in a separate include file, but icmpv6.h
75 * doesn't have in6_addr defined in all cases, there is no __u128, and no
76 * other files reference these.
77 *
78 * +-DLS 4/14/03
79 */
80
81 /* Multicast Listener Discovery version 2 headers */
82
83 struct mld2_grec {
84 __u8 grec_type;
85 __u8 grec_auxwords;
86 __be16 grec_nsrcs;
87 struct in6_addr grec_mca;
88 struct in6_addr grec_src[0];
89 };
90
91 struct mld2_report {
92 __u8 type;
93 __u8 resv1;
94 __sum16 csum;
95 __be16 resv2;
96 __be16 ngrec;
97 struct mld2_grec grec[0];
98 };
99
100 struct mld2_query {
101 __u8 type;
102 __u8 code;
103 __sum16 csum;
104 __be16 mrc;
105 __be16 resv1;
106 struct in6_addr mca;
107 #if defined(__LITTLE_ENDIAN_BITFIELD)
108 __u8 qrv:3,
109 suppress:1,
110 resv2:4;
111 #elif defined(__BIG_ENDIAN_BITFIELD)
112 __u8 resv2:4,
113 suppress:1,
114 qrv:3;
115 #else
116 #error "Please fix <asm/byteorder.h>"
117 #endif
118 __u8 qqic;
119 __be16 nsrcs;
120 struct in6_addr srcs[0];
121 };
122
123 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
124
125 /* Big mc list lock for all the sockets */
126 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
127
128 static void igmp6_join_group(struct ifmcaddr6 *ma);
129 static void igmp6_leave_group(struct ifmcaddr6 *ma);
130 static void igmp6_timer_handler(unsigned long data);
131
132 static void mld_gq_timer_expire(unsigned long data);
133 static void mld_ifc_timer_expire(unsigned long data);
134 static void mld_ifc_event(struct inet6_dev *idev);
135 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
136 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
137 static void mld_clear_delrec(struct inet6_dev *idev);
138 static int sf_setstate(struct ifmcaddr6 *pmc);
139 static void sf_markstate(struct ifmcaddr6 *pmc);
140 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
141 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
142 int sfmode, int sfcount, struct in6_addr *psfsrc,
143 int delta);
144 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
145 int sfmode, int sfcount, struct in6_addr *psfsrc,
146 int delta);
147 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
148 struct inet6_dev *idev);
149
150
151 #define IGMP6_UNSOLICITED_IVAL (10*HZ)
152 #define MLD_QRV_DEFAULT 2
153
154 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
155 (idev)->cnf.force_mld_version == 1 || \
156 ((idev)->mc_v1_seen && \
157 time_before(jiffies, (idev)->mc_v1_seen)))
158
159 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
160 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
161 ((value) < (thresh) ? (value) : \
162 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
163 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
164
165 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
166
167 #define IPV6_MLD_MAX_MSF 64
168
169 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
170
171 /*
172 * socket join on multicast group
173 */
174
175 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
176 {
177 struct net_device *dev = NULL;
178 struct ipv6_mc_socklist *mc_lst;
179 struct ipv6_pinfo *np = inet6_sk(sk);
180 struct net *net = sock_net(sk);
181 int err;
182
183 if (!ipv6_addr_is_multicast(addr))
184 return -EINVAL;
185
186 read_lock_bh(&ipv6_sk_mc_lock);
187 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
188 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
189 ipv6_addr_equal(&mc_lst->addr, addr)) {
190 read_unlock_bh(&ipv6_sk_mc_lock);
191 return -EADDRINUSE;
192 }
193 }
194 read_unlock_bh(&ipv6_sk_mc_lock);
195
196 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
197
198 if (mc_lst == NULL)
199 return -ENOMEM;
200
201 mc_lst->next = NULL;
202 ipv6_addr_copy(&mc_lst->addr, addr);
203
204 if (ifindex == 0) {
205 struct rt6_info *rt;
206 rt = rt6_lookup(net, addr, NULL, 0, 0);
207 if (rt) {
208 dev = rt->rt6i_dev;
209 dev_hold(dev);
210 dst_release(&rt->u.dst);
211 }
212 } else
213 dev = dev_get_by_index(net, ifindex);
214
215 if (dev == NULL) {
216 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
217 return -ENODEV;
218 }
219
220 mc_lst->ifindex = dev->ifindex;
221 mc_lst->sfmode = MCAST_EXCLUDE;
222 rwlock_init(&mc_lst->sflock);
223 mc_lst->sflist = NULL;
224
225 /*
226 * now add/increase the group membership on the device
227 */
228
229 err = ipv6_dev_mc_inc(dev, addr);
230
231 if (err) {
232 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
233 dev_put(dev);
234 return err;
235 }
236
237 write_lock_bh(&ipv6_sk_mc_lock);
238 mc_lst->next = np->ipv6_mc_list;
239 np->ipv6_mc_list = mc_lst;
240 write_unlock_bh(&ipv6_sk_mc_lock);
241
242 dev_put(dev);
243
244 return 0;
245 }
246
247 /*
248 * socket leave on multicast group
249 */
250 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
251 {
252 struct ipv6_pinfo *np = inet6_sk(sk);
253 struct ipv6_mc_socklist *mc_lst, **lnk;
254 struct net *net = sock_net(sk);
255
256 write_lock_bh(&ipv6_sk_mc_lock);
257 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
258 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
259 ipv6_addr_equal(&mc_lst->addr, addr)) {
260 struct net_device *dev;
261
262 *lnk = mc_lst->next;
263 write_unlock_bh(&ipv6_sk_mc_lock);
264
265 dev = dev_get_by_index(net, mc_lst->ifindex);
266 if (dev != NULL) {
267 struct inet6_dev *idev = in6_dev_get(dev);
268
269 (void) ip6_mc_leave_src(sk, mc_lst, idev);
270 if (idev) {
271 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
272 in6_dev_put(idev);
273 }
274 dev_put(dev);
275 } else
276 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
277 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
278 return 0;
279 }
280 }
281 write_unlock_bh(&ipv6_sk_mc_lock);
282
283 return -EADDRNOTAVAIL;
284 }
285
286 static struct inet6_dev *ip6_mc_find_dev(struct net *net,
287 struct in6_addr *group,
288 int ifindex)
289 {
290 struct net_device *dev = NULL;
291 struct inet6_dev *idev = NULL;
292
293 if (ifindex == 0) {
294 struct rt6_info *rt;
295
296 rt = rt6_lookup(net, group, NULL, 0, 0);
297 if (rt) {
298 dev = rt->rt6i_dev;
299 dev_hold(dev);
300 dst_release(&rt->u.dst);
301 }
302 } else
303 dev = dev_get_by_index(net, ifindex);
304
305 if (!dev)
306 goto nodev;
307 idev = in6_dev_get(dev);
308 if (!idev)
309 goto release;
310 read_lock_bh(&idev->lock);
311 if (idev->dead)
312 goto unlock_release;
313
314 return idev;
315
316 unlock_release:
317 read_unlock_bh(&idev->lock);
318 in6_dev_put(idev);
319 release:
320 dev_put(dev);
321 nodev:
322 return NULL;
323 }
324
325 void ipv6_sock_mc_close(struct sock *sk)
326 {
327 struct ipv6_pinfo *np = inet6_sk(sk);
328 struct ipv6_mc_socklist *mc_lst;
329 struct net *net = sock_net(sk);
330
331 write_lock_bh(&ipv6_sk_mc_lock);
332 while ((mc_lst = np->ipv6_mc_list) != NULL) {
333 struct net_device *dev;
334
335 np->ipv6_mc_list = mc_lst->next;
336 write_unlock_bh(&ipv6_sk_mc_lock);
337
338 dev = dev_get_by_index(net, mc_lst->ifindex);
339 if (dev) {
340 struct inet6_dev *idev = in6_dev_get(dev);
341
342 (void) ip6_mc_leave_src(sk, mc_lst, idev);
343 if (idev) {
344 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
345 in6_dev_put(idev);
346 }
347 dev_put(dev);
348 } else
349 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
350
351 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
352
353 write_lock_bh(&ipv6_sk_mc_lock);
354 }
355 write_unlock_bh(&ipv6_sk_mc_lock);
356 }
357
358 int ip6_mc_source(int add, int omode, struct sock *sk,
359 struct group_source_req *pgsr)
360 {
361 struct in6_addr *source, *group;
362 struct ipv6_mc_socklist *pmc;
363 struct net_device *dev;
364 struct inet6_dev *idev;
365 struct ipv6_pinfo *inet6 = inet6_sk(sk);
366 struct ip6_sf_socklist *psl;
367 struct net *net = sock_net(sk);
368 int i, j, rv;
369 int leavegroup = 0;
370 int pmclocked = 0;
371 int err;
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(net, 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 struct net *net = sock_net(sk);
504 int leavegroup = 0;
505 int i, err;
506
507 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
508
509 if (!ipv6_addr_is_multicast(group))
510 return -EINVAL;
511 if (gsf->gf_fmode != MCAST_INCLUDE &&
512 gsf->gf_fmode != MCAST_EXCLUDE)
513 return -EINVAL;
514
515 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
516
517 if (!idev)
518 return -ENODEV;
519 dev = idev->dev;
520
521 err = 0;
522 read_lock_bh(&ipv6_sk_mc_lock);
523
524 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
525 leavegroup = 1;
526 goto done;
527 }
528
529 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
530 if (pmc->ifindex != gsf->gf_interface)
531 continue;
532 if (ipv6_addr_equal(&pmc->addr, group))
533 break;
534 }
535 if (!pmc) { /* must have a prior join */
536 err = -EINVAL;
537 goto done;
538 }
539 if (gsf->gf_numsrc) {
540 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
541 GFP_ATOMIC);
542 if (!newpsl) {
543 err = -ENOBUFS;
544 goto done;
545 }
546 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
547 for (i=0; i<newpsl->sl_count; ++i) {
548 struct sockaddr_in6 *psin6;
549
550 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
551 newpsl->sl_addr[i] = psin6->sin6_addr;
552 }
553 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
554 newpsl->sl_count, newpsl->sl_addr, 0);
555 if (err) {
556 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
557 goto done;
558 }
559 } else {
560 newpsl = NULL;
561 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
562 }
563
564 write_lock_bh(&pmc->sflock);
565 psl = pmc->sflist;
566 if (psl) {
567 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
568 psl->sl_count, psl->sl_addr, 0);
569 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
570 } else
571 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
572 pmc->sflist = newpsl;
573 pmc->sfmode = gsf->gf_fmode;
574 write_unlock_bh(&pmc->sflock);
575 err = 0;
576 done:
577 read_unlock_bh(&ipv6_sk_mc_lock);
578 read_unlock_bh(&idev->lock);
579 in6_dev_put(idev);
580 dev_put(dev);
581 if (leavegroup)
582 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
583 return err;
584 }
585
586 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
587 struct group_filter __user *optval, int __user *optlen)
588 {
589 int err, i, count, copycount;
590 struct in6_addr *group;
591 struct ipv6_mc_socklist *pmc;
592 struct inet6_dev *idev;
593 struct net_device *dev;
594 struct ipv6_pinfo *inet6 = inet6_sk(sk);
595 struct ip6_sf_socklist *psl;
596 struct net *net = sock_net(sk);
597
598 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
599
600 if (!ipv6_addr_is_multicast(group))
601 return -EINVAL;
602
603 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
604
605 if (!idev)
606 return -ENODEV;
607
608 dev = idev->dev;
609
610 err = -EADDRNOTAVAIL;
611 /*
612 * changes to the ipv6_mc_list require the socket lock and
613 * a read lock on ip6_sk_mc_lock. We have the socket lock,
614 * so reading the list is safe.
615 */
616
617 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
618 if (pmc->ifindex != gsf->gf_interface)
619 continue;
620 if (ipv6_addr_equal(group, &pmc->addr))
621 break;
622 }
623 if (!pmc) /* must have a prior join */
624 goto done;
625 gsf->gf_fmode = pmc->sfmode;
626 psl = pmc->sflist;
627 count = psl ? psl->sl_count : 0;
628 read_unlock_bh(&idev->lock);
629 in6_dev_put(idev);
630 dev_put(dev);
631
632 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
633 gsf->gf_numsrc = count;
634 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
635 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
636 return -EFAULT;
637 }
638 /* changes to psl require the socket lock, a read lock on
639 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
640 * have the socket lock, so reading here is safe.
641 */
642 for (i=0; i<copycount; i++) {
643 struct sockaddr_in6 *psin6;
644 struct sockaddr_storage ss;
645
646 psin6 = (struct sockaddr_in6 *)&ss;
647 memset(&ss, 0, sizeof(ss));
648 psin6->sin6_family = AF_INET6;
649 psin6->sin6_addr = psl->sl_addr[i];
650 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
651 return -EFAULT;
652 }
653 return 0;
654 done:
655 read_unlock_bh(&idev->lock);
656 in6_dev_put(idev);
657 dev_put(dev);
658 return err;
659 }
660
661 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
662 const struct in6_addr *src_addr)
663 {
664 struct ipv6_pinfo *np = inet6_sk(sk);
665 struct ipv6_mc_socklist *mc;
666 struct ip6_sf_socklist *psl;
667 int rv = 1;
668
669 read_lock(&ipv6_sk_mc_lock);
670 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
671 if (ipv6_addr_equal(&mc->addr, mc_addr))
672 break;
673 }
674 if (!mc) {
675 read_unlock(&ipv6_sk_mc_lock);
676 return 1;
677 }
678 read_lock(&mc->sflock);
679 psl = mc->sflist;
680 if (!psl) {
681 rv = mc->sfmode == MCAST_EXCLUDE;
682 } else {
683 int i;
684
685 for (i=0; i<psl->sl_count; i++) {
686 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
687 break;
688 }
689 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
690 rv = 0;
691 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
692 rv = 0;
693 }
694 read_unlock(&mc->sflock);
695 read_unlock(&ipv6_sk_mc_lock);
696
697 return rv;
698 }
699
700 static void ma_put(struct ifmcaddr6 *mc)
701 {
702 if (atomic_dec_and_test(&mc->mca_refcnt)) {
703 in6_dev_put(mc->idev);
704 kfree(mc);
705 }
706 }
707
708 static void igmp6_group_added(struct ifmcaddr6 *mc)
709 {
710 struct net_device *dev = mc->idev->dev;
711 char buf[MAX_ADDR_LEN];
712
713 spin_lock_bh(&mc->mca_lock);
714 if (!(mc->mca_flags&MAF_LOADED)) {
715 mc->mca_flags |= MAF_LOADED;
716 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
717 dev_mc_add(dev, buf, dev->addr_len, 0);
718 }
719 spin_unlock_bh(&mc->mca_lock);
720
721 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
722 return;
723
724 if (MLD_V1_SEEN(mc->idev)) {
725 igmp6_join_group(mc);
726 return;
727 }
728 /* else v2 */
729
730 mc->mca_crcount = mc->idev->mc_qrv;
731 mld_ifc_event(mc->idev);
732 }
733
734 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
735 {
736 struct net_device *dev = mc->idev->dev;
737 char buf[MAX_ADDR_LEN];
738
739 spin_lock_bh(&mc->mca_lock);
740 if (mc->mca_flags&MAF_LOADED) {
741 mc->mca_flags &= ~MAF_LOADED;
742 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
743 dev_mc_delete(dev, buf, dev->addr_len, 0);
744 }
745
746 if (mc->mca_flags & MAF_NOREPORT)
747 goto done;
748 spin_unlock_bh(&mc->mca_lock);
749
750 if (!mc->idev->dead)
751 igmp6_leave_group(mc);
752
753 spin_lock_bh(&mc->mca_lock);
754 if (del_timer(&mc->mca_timer))
755 atomic_dec(&mc->mca_refcnt);
756 done:
757 ip6_mc_clear_src(mc);
758 spin_unlock_bh(&mc->mca_lock);
759 }
760
761 /*
762 * deleted ifmcaddr6 manipulation
763 */
764 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
765 {
766 struct ifmcaddr6 *pmc;
767
768 /* this is an "ifmcaddr6" for convenience; only the fields below
769 * are actually used. In particular, the refcnt and users are not
770 * used for management of the delete list. Using the same structure
771 * for deleted items allows change reports to use common code with
772 * non-deleted or query-response MCA's.
773 */
774 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
775 if (!pmc)
776 return;
777
778 spin_lock_bh(&im->mca_lock);
779 spin_lock_init(&pmc->mca_lock);
780 pmc->idev = im->idev;
781 in6_dev_hold(idev);
782 pmc->mca_addr = im->mca_addr;
783 pmc->mca_crcount = idev->mc_qrv;
784 pmc->mca_sfmode = im->mca_sfmode;
785 if (pmc->mca_sfmode == MCAST_INCLUDE) {
786 struct ip6_sf_list *psf;
787
788 pmc->mca_tomb = im->mca_tomb;
789 pmc->mca_sources = im->mca_sources;
790 im->mca_tomb = im->mca_sources = NULL;
791 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
792 psf->sf_crcount = pmc->mca_crcount;
793 }
794 spin_unlock_bh(&im->mca_lock);
795
796 write_lock_bh(&idev->mc_lock);
797 pmc->next = idev->mc_tomb;
798 idev->mc_tomb = pmc;
799 write_unlock_bh(&idev->mc_lock);
800 }
801
802 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
803 {
804 struct ifmcaddr6 *pmc, *pmc_prev;
805 struct ip6_sf_list *psf, *psf_next;
806
807 write_lock_bh(&idev->mc_lock);
808 pmc_prev = NULL;
809 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
810 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
811 break;
812 pmc_prev = pmc;
813 }
814 if (pmc) {
815 if (pmc_prev)
816 pmc_prev->next = pmc->next;
817 else
818 idev->mc_tomb = pmc->next;
819 }
820 write_unlock_bh(&idev->mc_lock);
821 if (pmc) {
822 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
823 psf_next = psf->sf_next;
824 kfree(psf);
825 }
826 in6_dev_put(pmc->idev);
827 kfree(pmc);
828 }
829 }
830
831 static void mld_clear_delrec(struct inet6_dev *idev)
832 {
833 struct ifmcaddr6 *pmc, *nextpmc;
834
835 write_lock_bh(&idev->mc_lock);
836 pmc = idev->mc_tomb;
837 idev->mc_tomb = NULL;
838 write_unlock_bh(&idev->mc_lock);
839
840 for (; pmc; pmc = nextpmc) {
841 nextpmc = pmc->next;
842 ip6_mc_clear_src(pmc);
843 in6_dev_put(pmc->idev);
844 kfree(pmc);
845 }
846
847 /* clear dead sources, too */
848 read_lock_bh(&idev->lock);
849 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
850 struct ip6_sf_list *psf, *psf_next;
851
852 spin_lock_bh(&pmc->mca_lock);
853 psf = pmc->mca_tomb;
854 pmc->mca_tomb = NULL;
855 spin_unlock_bh(&pmc->mca_lock);
856 for (; psf; psf=psf_next) {
857 psf_next = psf->sf_next;
858 kfree(psf);
859 }
860 }
861 read_unlock_bh(&idev->lock);
862 }
863
864
865 /*
866 * device multicast group inc (add if not found)
867 */
868 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
869 {
870 struct ifmcaddr6 *mc;
871 struct inet6_dev *idev;
872
873 idev = in6_dev_get(dev);
874
875 if (idev == NULL)
876 return -EINVAL;
877
878 write_lock_bh(&idev->lock);
879 if (idev->dead) {
880 write_unlock_bh(&idev->lock);
881 in6_dev_put(idev);
882 return -ENODEV;
883 }
884
885 for (mc = idev->mc_list; mc; mc = mc->next) {
886 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
887 mc->mca_users++;
888 write_unlock_bh(&idev->lock);
889 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
890 NULL, 0);
891 in6_dev_put(idev);
892 return 0;
893 }
894 }
895
896 /*
897 * not found: create a new one.
898 */
899
900 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
901
902 if (mc == NULL) {
903 write_unlock_bh(&idev->lock);
904 in6_dev_put(idev);
905 return -ENOMEM;
906 }
907
908 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
909
910 ipv6_addr_copy(&mc->mca_addr, addr);
911 mc->idev = idev;
912 mc->mca_users = 1;
913 /* mca_stamp should be updated upon changes */
914 mc->mca_cstamp = mc->mca_tstamp = jiffies;
915 atomic_set(&mc->mca_refcnt, 2);
916 spin_lock_init(&mc->mca_lock);
917
918 /* initial mode is (EX, empty) */
919 mc->mca_sfmode = MCAST_EXCLUDE;
920 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
921
922 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
923 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
924 mc->mca_flags |= MAF_NOREPORT;
925
926 mc->next = idev->mc_list;
927 idev->mc_list = mc;
928 write_unlock_bh(&idev->lock);
929
930 mld_del_delrec(idev, &mc->mca_addr);
931 igmp6_group_added(mc);
932 ma_put(mc);
933 return 0;
934 }
935
936 /*
937 * device multicast group del
938 */
939 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
940 {
941 struct ifmcaddr6 *ma, **map;
942
943 write_lock_bh(&idev->lock);
944 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
945 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
946 if (--ma->mca_users == 0) {
947 *map = ma->next;
948 write_unlock_bh(&idev->lock);
949
950 igmp6_group_dropped(ma);
951
952 ma_put(ma);
953 return 0;
954 }
955 write_unlock_bh(&idev->lock);
956 return 0;
957 }
958 }
959 write_unlock_bh(&idev->lock);
960
961 return -ENOENT;
962 }
963
964 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
965 {
966 struct inet6_dev *idev = in6_dev_get(dev);
967 int err;
968
969 if (!idev)
970 return -ENODEV;
971
972 err = __ipv6_dev_mc_dec(idev, addr);
973
974 in6_dev_put(idev);
975
976 return err;
977 }
978
979 /*
980 * identify MLD packets for MLD filter exceptions
981 */
982 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
983 {
984 struct icmp6hdr *pic;
985
986 if (nexthdr != IPPROTO_ICMPV6)
987 return 0;
988
989 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
990 return 0;
991
992 pic = icmp6_hdr(skb);
993
994 switch (pic->icmp6_type) {
995 case ICMPV6_MGM_QUERY:
996 case ICMPV6_MGM_REPORT:
997 case ICMPV6_MGM_REDUCTION:
998 case ICMPV6_MLD2_REPORT:
999 return 1;
1000 default:
1001 break;
1002 }
1003 return 0;
1004 }
1005
1006 /*
1007 * check if the interface/address pair is valid
1008 */
1009 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1010 const struct in6_addr *src_addr)
1011 {
1012 struct inet6_dev *idev;
1013 struct ifmcaddr6 *mc;
1014 int rv = 0;
1015
1016 idev = in6_dev_get(dev);
1017 if (idev) {
1018 read_lock_bh(&idev->lock);
1019 for (mc = idev->mc_list; mc; mc=mc->next) {
1020 if (ipv6_addr_equal(&mc->mca_addr, group))
1021 break;
1022 }
1023 if (mc) {
1024 if (src_addr && !ipv6_addr_any(src_addr)) {
1025 struct ip6_sf_list *psf;
1026
1027 spin_lock_bh(&mc->mca_lock);
1028 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1029 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1030 break;
1031 }
1032 if (psf)
1033 rv = psf->sf_count[MCAST_INCLUDE] ||
1034 psf->sf_count[MCAST_EXCLUDE] !=
1035 mc->mca_sfcount[MCAST_EXCLUDE];
1036 else
1037 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1038 spin_unlock_bh(&mc->mca_lock);
1039 } else
1040 rv = 1; /* don't filter unspecified source */
1041 }
1042 read_unlock_bh(&idev->lock);
1043 in6_dev_put(idev);
1044 }
1045 return rv;
1046 }
1047
1048 static void mld_gq_start_timer(struct inet6_dev *idev)
1049 {
1050 int tv = net_random() % idev->mc_maxdelay;
1051
1052 idev->mc_gq_running = 1;
1053 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1054 in6_dev_hold(idev);
1055 }
1056
1057 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1058 {
1059 int tv = net_random() % delay;
1060
1061 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1062 in6_dev_hold(idev);
1063 }
1064
1065 /*
1066 * IGMP handling (alias multicast ICMPv6 messages)
1067 */
1068
1069 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1070 {
1071 unsigned long delay = resptime;
1072
1073 /* Do not start timer for these addresses */
1074 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1075 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1076 return;
1077
1078 if (del_timer(&ma->mca_timer)) {
1079 atomic_dec(&ma->mca_refcnt);
1080 delay = ma->mca_timer.expires - jiffies;
1081 }
1082
1083 if (delay >= resptime) {
1084 if (resptime)
1085 delay = net_random() % resptime;
1086 else
1087 delay = 1;
1088 }
1089 ma->mca_timer.expires = jiffies + delay;
1090 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1091 atomic_inc(&ma->mca_refcnt);
1092 ma->mca_flags |= MAF_TIMER_RUNNING;
1093 }
1094
1095 /* mark EXCLUDE-mode sources */
1096 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1097 struct in6_addr *srcs)
1098 {
1099 struct ip6_sf_list *psf;
1100 int i, scount;
1101
1102 scount = 0;
1103 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1104 if (scount == nsrcs)
1105 break;
1106 for (i=0; i<nsrcs; i++) {
1107 /* skip inactive filters */
1108 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1109 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1110 psf->sf_count[MCAST_EXCLUDE])
1111 continue;
1112 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1113 scount++;
1114 break;
1115 }
1116 }
1117 }
1118 pmc->mca_flags &= ~MAF_GSQUERY;
1119 if (scount == nsrcs) /* all sources excluded */
1120 return 0;
1121 return 1;
1122 }
1123
1124 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1125 struct in6_addr *srcs)
1126 {
1127 struct ip6_sf_list *psf;
1128 int i, scount;
1129
1130 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1131 return mld_xmarksources(pmc, nsrcs, srcs);
1132
1133 /* mark INCLUDE-mode sources */
1134
1135 scount = 0;
1136 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1137 if (scount == nsrcs)
1138 break;
1139 for (i=0; i<nsrcs; i++) {
1140 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1141 psf->sf_gsresp = 1;
1142 scount++;
1143 break;
1144 }
1145 }
1146 }
1147 if (!scount) {
1148 pmc->mca_flags &= ~MAF_GSQUERY;
1149 return 0;
1150 }
1151 pmc->mca_flags |= MAF_GSQUERY;
1152 return 1;
1153 }
1154
1155 int igmp6_event_query(struct sk_buff *skb)
1156 {
1157 struct mld2_query *mlh2 = NULL;
1158 struct ifmcaddr6 *ma;
1159 struct in6_addr *group;
1160 unsigned long max_delay;
1161 struct inet6_dev *idev;
1162 struct icmp6hdr *hdr;
1163 int group_type;
1164 int mark = 0;
1165 int len;
1166
1167 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1168 return -EINVAL;
1169
1170 /* compute payload length excluding extension headers */
1171 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1172 len -= skb_network_header_len(skb);
1173
1174 /* Drop queries with not link local source */
1175 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1176 return -EINVAL;
1177
1178 idev = in6_dev_get(skb->dev);
1179
1180 if (idev == NULL)
1181 return 0;
1182
1183 hdr = icmp6_hdr(skb);
1184 group = (struct in6_addr *) (hdr + 1);
1185 group_type = ipv6_addr_type(group);
1186
1187 if (group_type != IPV6_ADDR_ANY &&
1188 !(group_type&IPV6_ADDR_MULTICAST)) {
1189 in6_dev_put(idev);
1190 return -EINVAL;
1191 }
1192
1193 if (len == 24) {
1194 int switchback;
1195 /* MLDv1 router present */
1196
1197 /* Translate milliseconds to jiffies */
1198 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1199
1200 switchback = (idev->mc_qrv + 1) * max_delay;
1201 idev->mc_v1_seen = jiffies + switchback;
1202
1203 /* cancel the interface change timer */
1204 idev->mc_ifc_count = 0;
1205 if (del_timer(&idev->mc_ifc_timer))
1206 __in6_dev_put(idev);
1207 /* clear deleted report items */
1208 mld_clear_delrec(idev);
1209 } else if (len >= 28) {
1210 int srcs_offset = sizeof(struct mld2_query) -
1211 sizeof(struct icmp6hdr);
1212 if (!pskb_may_pull(skb, srcs_offset)) {
1213 in6_dev_put(idev);
1214 return -EINVAL;
1215 }
1216 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1217 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1218 if (!max_delay)
1219 max_delay = 1;
1220 idev->mc_maxdelay = max_delay;
1221 if (mlh2->qrv)
1222 idev->mc_qrv = mlh2->qrv;
1223 if (group_type == IPV6_ADDR_ANY) { /* general query */
1224 if (mlh2->nsrcs) {
1225 in6_dev_put(idev);
1226 return -EINVAL; /* no sources allowed */
1227 }
1228 mld_gq_start_timer(idev);
1229 in6_dev_put(idev);
1230 return 0;
1231 }
1232 /* mark sources to include, if group & source-specific */
1233 if (mlh2->nsrcs != 0) {
1234 if (!pskb_may_pull(skb, srcs_offset +
1235 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1236 in6_dev_put(idev);
1237 return -EINVAL;
1238 }
1239 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1240 mark = 1;
1241 }
1242 } else {
1243 in6_dev_put(idev);
1244 return -EINVAL;
1245 }
1246
1247 read_lock_bh(&idev->lock);
1248 if (group_type == IPV6_ADDR_ANY) {
1249 for (ma = idev->mc_list; ma; ma=ma->next) {
1250 spin_lock_bh(&ma->mca_lock);
1251 igmp6_group_queried(ma, max_delay);
1252 spin_unlock_bh(&ma->mca_lock);
1253 }
1254 } else {
1255 for (ma = idev->mc_list; ma; ma=ma->next) {
1256 if (!ipv6_addr_equal(group, &ma->mca_addr))
1257 continue;
1258 spin_lock_bh(&ma->mca_lock);
1259 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1260 /* gsquery <- gsquery && mark */
1261 if (!mark)
1262 ma->mca_flags &= ~MAF_GSQUERY;
1263 } else {
1264 /* gsquery <- mark */
1265 if (mark)
1266 ma->mca_flags |= MAF_GSQUERY;
1267 else
1268 ma->mca_flags &= ~MAF_GSQUERY;
1269 }
1270 if (!(ma->mca_flags & MAF_GSQUERY) ||
1271 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1272 igmp6_group_queried(ma, max_delay);
1273 spin_unlock_bh(&ma->mca_lock);
1274 break;
1275 }
1276 }
1277 read_unlock_bh(&idev->lock);
1278 in6_dev_put(idev);
1279
1280 return 0;
1281 }
1282
1283
1284 int igmp6_event_report(struct sk_buff *skb)
1285 {
1286 struct ifmcaddr6 *ma;
1287 struct in6_addr *addrp;
1288 struct inet6_dev *idev;
1289 struct icmp6hdr *hdr;
1290 int addr_type;
1291
1292 /* Our own report looped back. Ignore it. */
1293 if (skb->pkt_type == PACKET_LOOPBACK)
1294 return 0;
1295
1296 /* send our report if the MC router may not have heard this report */
1297 if (skb->pkt_type != PACKET_MULTICAST &&
1298 skb->pkt_type != PACKET_BROADCAST)
1299 return 0;
1300
1301 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1302 return -EINVAL;
1303
1304 hdr = icmp6_hdr(skb);
1305
1306 /* Drop reports with not link local source */
1307 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1308 if (addr_type != IPV6_ADDR_ANY &&
1309 !(addr_type&IPV6_ADDR_LINKLOCAL))
1310 return -EINVAL;
1311
1312 addrp = (struct in6_addr *) (hdr + 1);
1313
1314 idev = in6_dev_get(skb->dev);
1315 if (idev == NULL)
1316 return -ENODEV;
1317
1318 /*
1319 * Cancel the timer for this group
1320 */
1321
1322 read_lock_bh(&idev->lock);
1323 for (ma = idev->mc_list; ma; ma=ma->next) {
1324 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1325 spin_lock(&ma->mca_lock);
1326 if (del_timer(&ma->mca_timer))
1327 atomic_dec(&ma->mca_refcnt);
1328 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1329 spin_unlock(&ma->mca_lock);
1330 break;
1331 }
1332 }
1333 read_unlock_bh(&idev->lock);
1334 in6_dev_put(idev);
1335 return 0;
1336 }
1337
1338 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1339 int gdeleted, int sdeleted)
1340 {
1341 switch (type) {
1342 case MLD2_MODE_IS_INCLUDE:
1343 case MLD2_MODE_IS_EXCLUDE:
1344 if (gdeleted || sdeleted)
1345 return 0;
1346 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1347 if (pmc->mca_sfmode == MCAST_INCLUDE)
1348 return 1;
1349 /* don't include if this source is excluded
1350 * in all filters
1351 */
1352 if (psf->sf_count[MCAST_INCLUDE])
1353 return type == MLD2_MODE_IS_INCLUDE;
1354 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1355 psf->sf_count[MCAST_EXCLUDE];
1356 }
1357 return 0;
1358 case MLD2_CHANGE_TO_INCLUDE:
1359 if (gdeleted || sdeleted)
1360 return 0;
1361 return psf->sf_count[MCAST_INCLUDE] != 0;
1362 case MLD2_CHANGE_TO_EXCLUDE:
1363 if (gdeleted || sdeleted)
1364 return 0;
1365 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1366 psf->sf_count[MCAST_INCLUDE])
1367 return 0;
1368 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1369 psf->sf_count[MCAST_EXCLUDE];
1370 case MLD2_ALLOW_NEW_SOURCES:
1371 if (gdeleted || !psf->sf_crcount)
1372 return 0;
1373 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1374 case MLD2_BLOCK_OLD_SOURCES:
1375 if (pmc->mca_sfmode == MCAST_INCLUDE)
1376 return gdeleted || (psf->sf_crcount && sdeleted);
1377 return psf->sf_crcount && !gdeleted && !sdeleted;
1378 }
1379 return 0;
1380 }
1381
1382 static int
1383 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1384 {
1385 struct ip6_sf_list *psf;
1386 int scount = 0;
1387
1388 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1389 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1390 continue;
1391 scount++;
1392 }
1393 return scount;
1394 }
1395
1396 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1397 {
1398 struct net *net = dev_net(dev);
1399 struct sock *sk = net->ipv6.igmp_sk;
1400 struct sk_buff *skb;
1401 struct mld2_report *pmr;
1402 struct in6_addr addr_buf;
1403 const struct in6_addr *saddr;
1404 int err;
1405 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1406 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1407 IPV6_TLV_PADN, 0 };
1408
1409 /* we assume size > sizeof(ra) here */
1410 skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
1411
1412 if (!skb)
1413 return NULL;
1414
1415 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1416
1417 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1418 /* <draft-ietf-magma-mld-source-05.txt>:
1419 * use unspecified address as the source address
1420 * when a valid link-local address is not available.
1421 */
1422 saddr = &in6addr_any;
1423 } else
1424 saddr = &addr_buf;
1425
1426 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1427
1428 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1429
1430 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1431 skb_put(skb, sizeof(*pmr));
1432 pmr = (struct mld2_report *)skb_transport_header(skb);
1433 pmr->type = ICMPV6_MLD2_REPORT;
1434 pmr->resv1 = 0;
1435 pmr->csum = 0;
1436 pmr->resv2 = 0;
1437 pmr->ngrec = 0;
1438 return skb;
1439 }
1440
1441 static void mld_sendpack(struct sk_buff *skb)
1442 {
1443 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1444 struct mld2_report *pmr =
1445 (struct mld2_report *)skb_transport_header(skb);
1446 int payload_len, mldlen;
1447 struct inet6_dev *idev = in6_dev_get(skb->dev);
1448 struct net *net = dev_net(skb->dev);
1449 int err;
1450 struct flowi fl;
1451 struct dst_entry *dst;
1452
1453 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1454
1455 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1456 mldlen = skb->tail - skb->transport_header;
1457 pip6->payload_len = htons(payload_len);
1458
1459 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1460 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1461 mldlen, 0));
1462
1463 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1464
1465 if (!dst) {
1466 err = -ENOMEM;
1467 goto err_out;
1468 }
1469
1470 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1471 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1472 skb->dev->ifindex);
1473
1474 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1475 skb_dst_set(skb, dst);
1476 if (err)
1477 goto err_out;
1478
1479 payload_len = skb->len;
1480
1481 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1482 dst_output);
1483 out:
1484 if (!err) {
1485 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1486 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1487 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1488 } else
1489 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1490
1491 if (likely(idev != NULL))
1492 in6_dev_put(idev);
1493 return;
1494
1495 err_out:
1496 kfree_skb(skb);
1497 goto out;
1498 }
1499
1500 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1501 {
1502 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1503 }
1504
1505 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1506 int type, struct mld2_grec **ppgr)
1507 {
1508 struct net_device *dev = pmc->idev->dev;
1509 struct mld2_report *pmr;
1510 struct mld2_grec *pgr;
1511
1512 if (!skb)
1513 skb = mld_newpack(dev, dev->mtu);
1514 if (!skb)
1515 return NULL;
1516 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1517 pgr->grec_type = type;
1518 pgr->grec_auxwords = 0;
1519 pgr->grec_nsrcs = 0;
1520 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1521 pmr = (struct mld2_report *)skb_transport_header(skb);
1522 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1523 *ppgr = pgr;
1524 return skb;
1525 }
1526
1527 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1528 skb_tailroom(skb)) : 0)
1529
1530 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1531 int type, int gdeleted, int sdeleted)
1532 {
1533 struct net_device *dev = pmc->idev->dev;
1534 struct mld2_report *pmr;
1535 struct mld2_grec *pgr = NULL;
1536 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1537 int scount, stotal, first, isquery, truncate;
1538
1539 if (pmc->mca_flags & MAF_NOREPORT)
1540 return skb;
1541
1542 isquery = type == MLD2_MODE_IS_INCLUDE ||
1543 type == MLD2_MODE_IS_EXCLUDE;
1544 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1545 type == MLD2_CHANGE_TO_EXCLUDE;
1546
1547 stotal = scount = 0;
1548
1549 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1550
1551 if (!*psf_list)
1552 goto empty_source;
1553
1554 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1555
1556 /* EX and TO_EX get a fresh packet, if needed */
1557 if (truncate) {
1558 if (pmr && pmr->ngrec &&
1559 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1560 if (skb)
1561 mld_sendpack(skb);
1562 skb = mld_newpack(dev, dev->mtu);
1563 }
1564 }
1565 first = 1;
1566 psf_prev = NULL;
1567 for (psf=*psf_list; psf; psf=psf_next) {
1568 struct in6_addr *psrc;
1569
1570 psf_next = psf->sf_next;
1571
1572 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1573 psf_prev = psf;
1574 continue;
1575 }
1576
1577 /* clear marks on query responses */
1578 if (isquery)
1579 psf->sf_gsresp = 0;
1580
1581 if (AVAILABLE(skb) < sizeof(*psrc) +
1582 first*sizeof(struct mld2_grec)) {
1583 if (truncate && !first)
1584 break; /* truncate these */
1585 if (pgr)
1586 pgr->grec_nsrcs = htons(scount);
1587 if (skb)
1588 mld_sendpack(skb);
1589 skb = mld_newpack(dev, dev->mtu);
1590 first = 1;
1591 scount = 0;
1592 }
1593 if (first) {
1594 skb = add_grhead(skb, pmc, type, &pgr);
1595 first = 0;
1596 }
1597 if (!skb)
1598 return NULL;
1599 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1600 *psrc = psf->sf_addr;
1601 scount++; stotal++;
1602 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1603 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1604 psf->sf_crcount--;
1605 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1606 if (psf_prev)
1607 psf_prev->sf_next = psf->sf_next;
1608 else
1609 *psf_list = psf->sf_next;
1610 kfree(psf);
1611 continue;
1612 }
1613 }
1614 psf_prev = psf;
1615 }
1616
1617 empty_source:
1618 if (!stotal) {
1619 if (type == MLD2_ALLOW_NEW_SOURCES ||
1620 type == MLD2_BLOCK_OLD_SOURCES)
1621 return skb;
1622 if (pmc->mca_crcount || isquery) {
1623 /* make sure we have room for group header */
1624 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1625 mld_sendpack(skb);
1626 skb = NULL; /* add_grhead will get a new one */
1627 }
1628 skb = add_grhead(skb, pmc, type, &pgr);
1629 }
1630 }
1631 if (pgr)
1632 pgr->grec_nsrcs = htons(scount);
1633
1634 if (isquery)
1635 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1636 return skb;
1637 }
1638
1639 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1640 {
1641 struct sk_buff *skb = NULL;
1642 int type;
1643
1644 if (!pmc) {
1645 read_lock_bh(&idev->lock);
1646 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1647 if (pmc->mca_flags & MAF_NOREPORT)
1648 continue;
1649 spin_lock_bh(&pmc->mca_lock);
1650 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1651 type = MLD2_MODE_IS_EXCLUDE;
1652 else
1653 type = MLD2_MODE_IS_INCLUDE;
1654 skb = add_grec(skb, pmc, type, 0, 0);
1655 spin_unlock_bh(&pmc->mca_lock);
1656 }
1657 read_unlock_bh(&idev->lock);
1658 } else {
1659 spin_lock_bh(&pmc->mca_lock);
1660 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1661 type = MLD2_MODE_IS_EXCLUDE;
1662 else
1663 type = MLD2_MODE_IS_INCLUDE;
1664 skb = add_grec(skb, pmc, type, 0, 0);
1665 spin_unlock_bh(&pmc->mca_lock);
1666 }
1667 if (skb)
1668 mld_sendpack(skb);
1669 }
1670
1671 /*
1672 * remove zero-count source records from a source filter list
1673 */
1674 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1675 {
1676 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1677
1678 psf_prev = NULL;
1679 for (psf=*ppsf; psf; psf = psf_next) {
1680 psf_next = psf->sf_next;
1681 if (psf->sf_crcount == 0) {
1682 if (psf_prev)
1683 psf_prev->sf_next = psf->sf_next;
1684 else
1685 *ppsf = psf->sf_next;
1686 kfree(psf);
1687 } else
1688 psf_prev = psf;
1689 }
1690 }
1691
1692 static void mld_send_cr(struct inet6_dev *idev)
1693 {
1694 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1695 struct sk_buff *skb = NULL;
1696 int type, dtype;
1697
1698 read_lock_bh(&idev->lock);
1699 write_lock_bh(&idev->mc_lock);
1700
1701 /* deleted MCA's */
1702 pmc_prev = NULL;
1703 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1704 pmc_next = pmc->next;
1705 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1706 type = MLD2_BLOCK_OLD_SOURCES;
1707 dtype = MLD2_BLOCK_OLD_SOURCES;
1708 skb = add_grec(skb, pmc, type, 1, 0);
1709 skb = add_grec(skb, pmc, dtype, 1, 1);
1710 }
1711 if (pmc->mca_crcount) {
1712 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1713 type = MLD2_CHANGE_TO_INCLUDE;
1714 skb = add_grec(skb, pmc, type, 1, 0);
1715 }
1716 pmc->mca_crcount--;
1717 if (pmc->mca_crcount == 0) {
1718 mld_clear_zeros(&pmc->mca_tomb);
1719 mld_clear_zeros(&pmc->mca_sources);
1720 }
1721 }
1722 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1723 !pmc->mca_sources) {
1724 if (pmc_prev)
1725 pmc_prev->next = pmc_next;
1726 else
1727 idev->mc_tomb = pmc_next;
1728 in6_dev_put(pmc->idev);
1729 kfree(pmc);
1730 } else
1731 pmc_prev = pmc;
1732 }
1733 write_unlock_bh(&idev->mc_lock);
1734
1735 /* change recs */
1736 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1737 spin_lock_bh(&pmc->mca_lock);
1738 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1739 type = MLD2_BLOCK_OLD_SOURCES;
1740 dtype = MLD2_ALLOW_NEW_SOURCES;
1741 } else {
1742 type = MLD2_ALLOW_NEW_SOURCES;
1743 dtype = MLD2_BLOCK_OLD_SOURCES;
1744 }
1745 skb = add_grec(skb, pmc, type, 0, 0);
1746 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1747
1748 /* filter mode changes */
1749 if (pmc->mca_crcount) {
1750 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1751 type = MLD2_CHANGE_TO_EXCLUDE;
1752 else
1753 type = MLD2_CHANGE_TO_INCLUDE;
1754 skb = add_grec(skb, pmc, type, 0, 0);
1755 pmc->mca_crcount--;
1756 }
1757 spin_unlock_bh(&pmc->mca_lock);
1758 }
1759 read_unlock_bh(&idev->lock);
1760 if (!skb)
1761 return;
1762 (void) mld_sendpack(skb);
1763 }
1764
1765 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1766 {
1767 struct net *net = dev_net(dev);
1768 struct sock *sk = net->ipv6.igmp_sk;
1769 struct inet6_dev *idev;
1770 struct sk_buff *skb;
1771 struct icmp6hdr *hdr;
1772 const struct in6_addr *snd_addr, *saddr;
1773 struct in6_addr *addrp;
1774 struct in6_addr addr_buf;
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 };
1779 struct flowi fl;
1780 struct dst_entry *dst;
1781
1782 if (type == ICMPV6_MGM_REDUCTION)
1783 snd_addr = &in6addr_linklocal_allrouters;
1784 else
1785 snd_addr = addr;
1786
1787 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1788 payload_len = len + sizeof(ra);
1789 full_len = sizeof(struct ipv6hdr) + payload_len;
1790
1791 rcu_read_lock();
1792 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1793 IPSTATS_MIB_OUT, full_len);
1794 rcu_read_unlock();
1795
1796 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1797
1798 if (skb == NULL) {
1799 rcu_read_lock();
1800 IP6_INC_STATS(net, __in6_dev_get(dev),
1801 IPSTATS_MIB_OUTDISCARDS);
1802 rcu_read_unlock();
1803 return;
1804 }
1805
1806 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1807
1808 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1809 /* <draft-ietf-magma-mld-source-05.txt>:
1810 * use unspecified address as the source address
1811 * when a valid link-local address is not available.
1812 */
1813 saddr = &in6addr_any;
1814 } else
1815 saddr = &addr_buf;
1816
1817 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1818
1819 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1820
1821 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1822 memset(hdr, 0, sizeof(struct icmp6hdr));
1823 hdr->icmp6_type = type;
1824
1825 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1826 ipv6_addr_copy(addrp, addr);
1827
1828 hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1829 IPPROTO_ICMPV6,
1830 csum_partial(hdr, len, 0));
1831
1832 idev = in6_dev_get(skb->dev);
1833
1834 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1835 if (!dst) {
1836 err = -ENOMEM;
1837 goto err_out;
1838 }
1839
1840 icmpv6_flow_init(sk, &fl, type,
1841 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1842 skb->dev->ifindex);
1843
1844 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1845 if (err)
1846 goto err_out;
1847
1848 skb_dst_set(skb, dst);
1849 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1850 dst_output);
1851 out:
1852 if (!err) {
1853 ICMP6MSGOUT_INC_STATS(net, idev, type);
1854 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1855 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1856 } else
1857 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1858
1859 if (likely(idev != NULL))
1860 in6_dev_put(idev);
1861 return;
1862
1863 err_out:
1864 kfree_skb(skb);
1865 goto out;
1866 }
1867
1868 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1869 struct in6_addr *psfsrc)
1870 {
1871 struct ip6_sf_list *psf, *psf_prev;
1872 int rv = 0;
1873
1874 psf_prev = NULL;
1875 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1876 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1877 break;
1878 psf_prev = psf;
1879 }
1880 if (!psf || psf->sf_count[sfmode] == 0) {
1881 /* source filter not found, or count wrong => bug */
1882 return -ESRCH;
1883 }
1884 psf->sf_count[sfmode]--;
1885 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1886 struct inet6_dev *idev = pmc->idev;
1887
1888 /* no more filters for this source */
1889 if (psf_prev)
1890 psf_prev->sf_next = psf->sf_next;
1891 else
1892 pmc->mca_sources = psf->sf_next;
1893 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1894 !MLD_V1_SEEN(idev)) {
1895 psf->sf_crcount = idev->mc_qrv;
1896 psf->sf_next = pmc->mca_tomb;
1897 pmc->mca_tomb = psf;
1898 rv = 1;
1899 } else
1900 kfree(psf);
1901 }
1902 return rv;
1903 }
1904
1905 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1906 int sfmode, int sfcount, struct in6_addr *psfsrc,
1907 int delta)
1908 {
1909 struct ifmcaddr6 *pmc;
1910 int changerec = 0;
1911 int i, err;
1912
1913 if (!idev)
1914 return -ENODEV;
1915 read_lock_bh(&idev->lock);
1916 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1917 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1918 break;
1919 }
1920 if (!pmc) {
1921 /* MCA not found?? bug */
1922 read_unlock_bh(&idev->lock);
1923 return -ESRCH;
1924 }
1925 spin_lock_bh(&pmc->mca_lock);
1926 sf_markstate(pmc);
1927 if (!delta) {
1928 if (!pmc->mca_sfcount[sfmode]) {
1929 spin_unlock_bh(&pmc->mca_lock);
1930 read_unlock_bh(&idev->lock);
1931 return -EINVAL;
1932 }
1933 pmc->mca_sfcount[sfmode]--;
1934 }
1935 err = 0;
1936 for (i=0; i<sfcount; i++) {
1937 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1938
1939 changerec |= rv > 0;
1940 if (!err && rv < 0)
1941 err = rv;
1942 }
1943 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1944 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1945 pmc->mca_sfcount[MCAST_INCLUDE]) {
1946 struct ip6_sf_list *psf;
1947
1948 /* filter mode change */
1949 pmc->mca_sfmode = MCAST_INCLUDE;
1950 pmc->mca_crcount = idev->mc_qrv;
1951 idev->mc_ifc_count = pmc->mca_crcount;
1952 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1953 psf->sf_crcount = 0;
1954 mld_ifc_event(pmc->idev);
1955 } else if (sf_setstate(pmc) || changerec)
1956 mld_ifc_event(pmc->idev);
1957 spin_unlock_bh(&pmc->mca_lock);
1958 read_unlock_bh(&idev->lock);
1959 return err;
1960 }
1961
1962 /*
1963 * Add multicast single-source filter to the interface list
1964 */
1965 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1966 struct in6_addr *psfsrc, int delta)
1967 {
1968 struct ip6_sf_list *psf, *psf_prev;
1969
1970 psf_prev = NULL;
1971 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1972 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1973 break;
1974 psf_prev = psf;
1975 }
1976 if (!psf) {
1977 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1978 if (!psf)
1979 return -ENOBUFS;
1980
1981 psf->sf_addr = *psfsrc;
1982 if (psf_prev) {
1983 psf_prev->sf_next = psf;
1984 } else
1985 pmc->mca_sources = psf;
1986 }
1987 psf->sf_count[sfmode]++;
1988 return 0;
1989 }
1990
1991 static void sf_markstate(struct ifmcaddr6 *pmc)
1992 {
1993 struct ip6_sf_list *psf;
1994 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1995
1996 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1997 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1998 psf->sf_oldin = mca_xcount ==
1999 psf->sf_count[MCAST_EXCLUDE] &&
2000 !psf->sf_count[MCAST_INCLUDE];
2001 } else
2002 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2003 }
2004
2005 static int sf_setstate(struct ifmcaddr6 *pmc)
2006 {
2007 struct ip6_sf_list *psf, *dpsf;
2008 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2009 int qrv = pmc->idev->mc_qrv;
2010 int new_in, rv;
2011
2012 rv = 0;
2013 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2014 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2015 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2016 !psf->sf_count[MCAST_INCLUDE];
2017 } else
2018 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2019 if (new_in) {
2020 if (!psf->sf_oldin) {
2021 struct ip6_sf_list *prev = NULL;
2022
2023 for (dpsf=pmc->mca_tomb; dpsf;
2024 dpsf=dpsf->sf_next) {
2025 if (ipv6_addr_equal(&dpsf->sf_addr,
2026 &psf->sf_addr))
2027 break;
2028 prev = dpsf;
2029 }
2030 if (dpsf) {
2031 if (prev)
2032 prev->sf_next = dpsf->sf_next;
2033 else
2034 pmc->mca_tomb = dpsf->sf_next;
2035 kfree(dpsf);
2036 }
2037 psf->sf_crcount = qrv;
2038 rv++;
2039 }
2040 } else if (psf->sf_oldin) {
2041 psf->sf_crcount = 0;
2042 /*
2043 * add or update "delete" records if an active filter
2044 * is now inactive
2045 */
2046 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2047 if (ipv6_addr_equal(&dpsf->sf_addr,
2048 &psf->sf_addr))
2049 break;
2050 if (!dpsf) {
2051 dpsf = (struct ip6_sf_list *)
2052 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2053 if (!dpsf)
2054 continue;
2055 *dpsf = *psf;
2056 /* pmc->mca_lock held by callers */
2057 dpsf->sf_next = pmc->mca_tomb;
2058 pmc->mca_tomb = dpsf;
2059 }
2060 dpsf->sf_crcount = qrv;
2061 rv++;
2062 }
2063 }
2064 return rv;
2065 }
2066
2067 /*
2068 * Add multicast source filter list to the interface list
2069 */
2070 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2071 int sfmode, int sfcount, struct in6_addr *psfsrc,
2072 int delta)
2073 {
2074 struct ifmcaddr6 *pmc;
2075 int isexclude;
2076 int i, err;
2077
2078 if (!idev)
2079 return -ENODEV;
2080 read_lock_bh(&idev->lock);
2081 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2082 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2083 break;
2084 }
2085 if (!pmc) {
2086 /* MCA not found?? bug */
2087 read_unlock_bh(&idev->lock);
2088 return -ESRCH;
2089 }
2090 spin_lock_bh(&pmc->mca_lock);
2091
2092 sf_markstate(pmc);
2093 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2094 if (!delta)
2095 pmc->mca_sfcount[sfmode]++;
2096 err = 0;
2097 for (i=0; i<sfcount; i++) {
2098 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2099 if (err)
2100 break;
2101 }
2102 if (err) {
2103 int j;
2104
2105 if (!delta)
2106 pmc->mca_sfcount[sfmode]--;
2107 for (j=0; j<i; j++)
2108 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2109 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2110 struct ip6_sf_list *psf;
2111
2112 /* filter mode change */
2113 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2114 pmc->mca_sfmode = MCAST_EXCLUDE;
2115 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2116 pmc->mca_sfmode = MCAST_INCLUDE;
2117 /* else no filters; keep old mode for reports */
2118
2119 pmc->mca_crcount = idev->mc_qrv;
2120 idev->mc_ifc_count = pmc->mca_crcount;
2121 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2122 psf->sf_crcount = 0;
2123 mld_ifc_event(idev);
2124 } else if (sf_setstate(pmc))
2125 mld_ifc_event(idev);
2126 spin_unlock_bh(&pmc->mca_lock);
2127 read_unlock_bh(&idev->lock);
2128 return err;
2129 }
2130
2131 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2132 {
2133 struct ip6_sf_list *psf, *nextpsf;
2134
2135 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2136 nextpsf = psf->sf_next;
2137 kfree(psf);
2138 }
2139 pmc->mca_tomb = NULL;
2140 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2141 nextpsf = psf->sf_next;
2142 kfree(psf);
2143 }
2144 pmc->mca_sources = NULL;
2145 pmc->mca_sfmode = MCAST_EXCLUDE;
2146 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2147 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2148 }
2149
2150
2151 static void igmp6_join_group(struct ifmcaddr6 *ma)
2152 {
2153 unsigned long delay;
2154
2155 if (ma->mca_flags & MAF_NOREPORT)
2156 return;
2157
2158 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2159
2160 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2161
2162 spin_lock_bh(&ma->mca_lock);
2163 if (del_timer(&ma->mca_timer)) {
2164 atomic_dec(&ma->mca_refcnt);
2165 delay = ma->mca_timer.expires - jiffies;
2166 }
2167
2168 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2169 atomic_inc(&ma->mca_refcnt);
2170 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2171 spin_unlock_bh(&ma->mca_lock);
2172 }
2173
2174 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2175 struct inet6_dev *idev)
2176 {
2177 int err;
2178
2179 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2180 * so no other readers or writers of iml or its sflist
2181 */
2182 if (!iml->sflist) {
2183 /* any-source empty exclude case */
2184 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2185 }
2186 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2187 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2188 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2189 iml->sflist = NULL;
2190 return err;
2191 }
2192
2193 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2194 {
2195 if (MLD_V1_SEEN(ma->idev)) {
2196 if (ma->mca_flags & MAF_LAST_REPORTER)
2197 igmp6_send(&ma->mca_addr, ma->idev->dev,
2198 ICMPV6_MGM_REDUCTION);
2199 } else {
2200 mld_add_delrec(ma->idev, ma);
2201 mld_ifc_event(ma->idev);
2202 }
2203 }
2204
2205 static void mld_gq_timer_expire(unsigned long data)
2206 {
2207 struct inet6_dev *idev = (struct inet6_dev *)data;
2208
2209 idev->mc_gq_running = 0;
2210 mld_send_report(idev, NULL);
2211 __in6_dev_put(idev);
2212 }
2213
2214 static void mld_ifc_timer_expire(unsigned long data)
2215 {
2216 struct inet6_dev *idev = (struct inet6_dev *)data;
2217
2218 mld_send_cr(idev);
2219 if (idev->mc_ifc_count) {
2220 idev->mc_ifc_count--;
2221 if (idev->mc_ifc_count)
2222 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2223 }
2224 __in6_dev_put(idev);
2225 }
2226
2227 static void mld_ifc_event(struct inet6_dev *idev)
2228 {
2229 if (MLD_V1_SEEN(idev))
2230 return;
2231 idev->mc_ifc_count = idev->mc_qrv;
2232 mld_ifc_start_timer(idev, 1);
2233 }
2234
2235
2236 static void igmp6_timer_handler(unsigned long data)
2237 {
2238 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2239
2240 if (MLD_V1_SEEN(ma->idev))
2241 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2242 else
2243 mld_send_report(ma->idev, ma);
2244
2245 spin_lock(&ma->mca_lock);
2246 ma->mca_flags |= MAF_LAST_REPORTER;
2247 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2248 spin_unlock(&ma->mca_lock);
2249 ma_put(ma);
2250 }
2251
2252 /* Device changing type */
2253
2254 void ipv6_mc_unmap(struct inet6_dev *idev)
2255 {
2256 struct ifmcaddr6 *i;
2257
2258 /* Install multicast list, except for all-nodes (already installed) */
2259
2260 read_lock_bh(&idev->lock);
2261 for (i = idev->mc_list; i; i = i->next)
2262 igmp6_group_dropped(i);
2263 read_unlock_bh(&idev->lock);
2264 }
2265
2266 void ipv6_mc_remap(struct inet6_dev *idev)
2267 {
2268 ipv6_mc_up(idev);
2269 }
2270
2271 /* Device going down */
2272
2273 void ipv6_mc_down(struct inet6_dev *idev)
2274 {
2275 struct ifmcaddr6 *i;
2276
2277 /* Withdraw multicast list */
2278
2279 read_lock_bh(&idev->lock);
2280 idev->mc_ifc_count = 0;
2281 if (del_timer(&idev->mc_ifc_timer))
2282 __in6_dev_put(idev);
2283 idev->mc_gq_running = 0;
2284 if (del_timer(&idev->mc_gq_timer))
2285 __in6_dev_put(idev);
2286
2287 for (i = idev->mc_list; i; i=i->next)
2288 igmp6_group_dropped(i);
2289 read_unlock_bh(&idev->lock);
2290
2291 mld_clear_delrec(idev);
2292 }
2293
2294
2295 /* Device going up */
2296
2297 void ipv6_mc_up(struct inet6_dev *idev)
2298 {
2299 struct ifmcaddr6 *i;
2300
2301 /* Install multicast list, except for all-nodes (already installed) */
2302
2303 read_lock_bh(&idev->lock);
2304 for (i = idev->mc_list; i; i=i->next)
2305 igmp6_group_added(i);
2306 read_unlock_bh(&idev->lock);
2307 }
2308
2309 /* IPv6 device initialization. */
2310
2311 void ipv6_mc_init_dev(struct inet6_dev *idev)
2312 {
2313 write_lock_bh(&idev->lock);
2314 rwlock_init(&idev->mc_lock);
2315 idev->mc_gq_running = 0;
2316 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2317 (unsigned long)idev);
2318 idev->mc_tomb = NULL;
2319 idev->mc_ifc_count = 0;
2320 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2321 (unsigned long)idev);
2322 idev->mc_qrv = MLD_QRV_DEFAULT;
2323 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2324 idev->mc_v1_seen = 0;
2325 write_unlock_bh(&idev->lock);
2326 }
2327
2328 /*
2329 * Device is about to be destroyed: clean up.
2330 */
2331
2332 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2333 {
2334 struct ifmcaddr6 *i;
2335
2336 /* Deactivate timers */
2337 ipv6_mc_down(idev);
2338
2339 /* Delete all-nodes address. */
2340 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2341 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2342 * fail.
2343 */
2344 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2345
2346 if (idev->cnf.forwarding)
2347 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2348
2349 write_lock_bh(&idev->lock);
2350 while ((i = idev->mc_list) != NULL) {
2351 idev->mc_list = i->next;
2352 write_unlock_bh(&idev->lock);
2353
2354 igmp6_group_dropped(i);
2355 ma_put(i);
2356
2357 write_lock_bh(&idev->lock);
2358 }
2359 write_unlock_bh(&idev->lock);
2360 }
2361
2362 #ifdef CONFIG_PROC_FS
2363 struct igmp6_mc_iter_state {
2364 struct seq_net_private p;
2365 struct net_device *dev;
2366 struct inet6_dev *idev;
2367 };
2368
2369 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2370
2371 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2372 {
2373 struct ifmcaddr6 *im = NULL;
2374 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2375 struct net *net = seq_file_net(seq);
2376
2377 state->idev = NULL;
2378 for_each_netdev(net, state->dev) {
2379 struct inet6_dev *idev;
2380 idev = in6_dev_get(state->dev);
2381 if (!idev)
2382 continue;
2383 read_lock_bh(&idev->lock);
2384 im = idev->mc_list;
2385 if (im) {
2386 state->idev = idev;
2387 break;
2388 }
2389 read_unlock_bh(&idev->lock);
2390 in6_dev_put(idev);
2391 }
2392 return im;
2393 }
2394
2395 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2396 {
2397 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2398
2399 im = im->next;
2400 while (!im) {
2401 if (likely(state->idev != NULL)) {
2402 read_unlock_bh(&state->idev->lock);
2403 in6_dev_put(state->idev);
2404 }
2405 state->dev = next_net_device(state->dev);
2406 if (!state->dev) {
2407 state->idev = NULL;
2408 break;
2409 }
2410 state->idev = in6_dev_get(state->dev);
2411 if (!state->idev)
2412 continue;
2413 read_lock_bh(&state->idev->lock);
2414 im = state->idev->mc_list;
2415 }
2416 return im;
2417 }
2418
2419 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2420 {
2421 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2422 if (im)
2423 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2424 --pos;
2425 return pos ? NULL : im;
2426 }
2427
2428 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2429 __acquires(dev_base_lock)
2430 {
2431 read_lock(&dev_base_lock);
2432 return igmp6_mc_get_idx(seq, *pos);
2433 }
2434
2435 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2436 {
2437 struct ifmcaddr6 *im;
2438 im = igmp6_mc_get_next(seq, v);
2439 ++*pos;
2440 return im;
2441 }
2442
2443 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2444 __releases(dev_base_lock)
2445 {
2446 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2447 if (likely(state->idev != NULL)) {
2448 read_unlock_bh(&state->idev->lock);
2449 in6_dev_put(state->idev);
2450 state->idev = NULL;
2451 }
2452 state->dev = NULL;
2453 read_unlock(&dev_base_lock);
2454 }
2455
2456 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2457 {
2458 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2459 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2460
2461 seq_printf(seq,
2462 "%-4d %-15s %pi6 %5d %08X %ld\n",
2463 state->dev->ifindex, state->dev->name,
2464 &im->mca_addr,
2465 im->mca_users, im->mca_flags,
2466 (im->mca_flags&MAF_TIMER_RUNNING) ?
2467 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2468 return 0;
2469 }
2470
2471 static const struct seq_operations igmp6_mc_seq_ops = {
2472 .start = igmp6_mc_seq_start,
2473 .next = igmp6_mc_seq_next,
2474 .stop = igmp6_mc_seq_stop,
2475 .show = igmp6_mc_seq_show,
2476 };
2477
2478 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2479 {
2480 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2481 sizeof(struct igmp6_mc_iter_state));
2482 }
2483
2484 static const struct file_operations igmp6_mc_seq_fops = {
2485 .owner = THIS_MODULE,
2486 .open = igmp6_mc_seq_open,
2487 .read = seq_read,
2488 .llseek = seq_lseek,
2489 .release = seq_release_net,
2490 };
2491
2492 struct igmp6_mcf_iter_state {
2493 struct seq_net_private p;
2494 struct net_device *dev;
2495 struct inet6_dev *idev;
2496 struct ifmcaddr6 *im;
2497 };
2498
2499 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2500
2501 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2502 {
2503 struct ip6_sf_list *psf = NULL;
2504 struct ifmcaddr6 *im = NULL;
2505 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2506 struct net *net = seq_file_net(seq);
2507
2508 state->idev = NULL;
2509 state->im = NULL;
2510 for_each_netdev(net, state->dev) {
2511 struct inet6_dev *idev;
2512 idev = in6_dev_get(state->dev);
2513 if (unlikely(idev == NULL))
2514 continue;
2515 read_lock_bh(&idev->lock);
2516 im = idev->mc_list;
2517 if (likely(im != NULL)) {
2518 spin_lock_bh(&im->mca_lock);
2519 psf = im->mca_sources;
2520 if (likely(psf != NULL)) {
2521 state->im = im;
2522 state->idev = idev;
2523 break;
2524 }
2525 spin_unlock_bh(&im->mca_lock);
2526 }
2527 read_unlock_bh(&idev->lock);
2528 in6_dev_put(idev);
2529 }
2530 return psf;
2531 }
2532
2533 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2534 {
2535 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2536
2537 psf = psf->sf_next;
2538 while (!psf) {
2539 spin_unlock_bh(&state->im->mca_lock);
2540 state->im = state->im->next;
2541 while (!state->im) {
2542 if (likely(state->idev != NULL)) {
2543 read_unlock_bh(&state->idev->lock);
2544 in6_dev_put(state->idev);
2545 }
2546 state->dev = next_net_device(state->dev);
2547 if (!state->dev) {
2548 state->idev = NULL;
2549 goto out;
2550 }
2551 state->idev = in6_dev_get(state->dev);
2552 if (!state->idev)
2553 continue;
2554 read_lock_bh(&state->idev->lock);
2555 state->im = state->idev->mc_list;
2556 }
2557 if (!state->im)
2558 break;
2559 spin_lock_bh(&state->im->mca_lock);
2560 psf = state->im->mca_sources;
2561 }
2562 out:
2563 return psf;
2564 }
2565
2566 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2567 {
2568 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2569 if (psf)
2570 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2571 --pos;
2572 return pos ? NULL : psf;
2573 }
2574
2575 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2576 __acquires(dev_base_lock)
2577 {
2578 read_lock(&dev_base_lock);
2579 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2580 }
2581
2582 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2583 {
2584 struct ip6_sf_list *psf;
2585 if (v == SEQ_START_TOKEN)
2586 psf = igmp6_mcf_get_first(seq);
2587 else
2588 psf = igmp6_mcf_get_next(seq, v);
2589 ++*pos;
2590 return psf;
2591 }
2592
2593 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2594 __releases(dev_base_lock)
2595 {
2596 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2597 if (likely(state->im != NULL)) {
2598 spin_unlock_bh(&state->im->mca_lock);
2599 state->im = NULL;
2600 }
2601 if (likely(state->idev != NULL)) {
2602 read_unlock_bh(&state->idev->lock);
2603 in6_dev_put(state->idev);
2604 state->idev = NULL;
2605 }
2606 state->dev = NULL;
2607 read_unlock(&dev_base_lock);
2608 }
2609
2610 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2611 {
2612 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2613 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2614
2615 if (v == SEQ_START_TOKEN) {
2616 seq_printf(seq,
2617 "%3s %6s "
2618 "%32s %32s %6s %6s\n", "Idx",
2619 "Device", "Multicast Address",
2620 "Source Address", "INC", "EXC");
2621 } else {
2622 seq_printf(seq,
2623 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2624 state->dev->ifindex, state->dev->name,
2625 &state->im->mca_addr,
2626 &psf->sf_addr,
2627 psf->sf_count[MCAST_INCLUDE],
2628 psf->sf_count[MCAST_EXCLUDE]);
2629 }
2630 return 0;
2631 }
2632
2633 static const struct seq_operations igmp6_mcf_seq_ops = {
2634 .start = igmp6_mcf_seq_start,
2635 .next = igmp6_mcf_seq_next,
2636 .stop = igmp6_mcf_seq_stop,
2637 .show = igmp6_mcf_seq_show,
2638 };
2639
2640 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2641 {
2642 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2643 sizeof(struct igmp6_mcf_iter_state));
2644 }
2645
2646 static const struct file_operations igmp6_mcf_seq_fops = {
2647 .owner = THIS_MODULE,
2648 .open = igmp6_mcf_seq_open,
2649 .read = seq_read,
2650 .llseek = seq_lseek,
2651 .release = seq_release_net,
2652 };
2653
2654 static int igmp6_proc_init(struct net *net)
2655 {
2656 int err;
2657
2658 err = -ENOMEM;
2659 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2660 goto out;
2661 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2662 &igmp6_mcf_seq_fops))
2663 goto out_proc_net_igmp6;
2664
2665 err = 0;
2666 out:
2667 return err;
2668
2669 out_proc_net_igmp6:
2670 proc_net_remove(net, "igmp6");
2671 goto out;
2672 }
2673
2674 static void igmp6_proc_exit(struct net *net)
2675 {
2676 proc_net_remove(net, "mcfilter6");
2677 proc_net_remove(net, "igmp6");
2678 }
2679 #else
2680 static int igmp6_proc_init(struct net *net)
2681 {
2682 return 0;
2683 }
2684 static void igmp6_proc_exit(struct net *net)
2685 {
2686 ;
2687 }
2688 #endif
2689
2690 static int igmp6_net_init(struct net *net)
2691 {
2692 int err;
2693
2694 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2695 SOCK_RAW, IPPROTO_ICMPV6, net);
2696 if (err < 0) {
2697 printk(KERN_ERR
2698 "Failed to initialize the IGMP6 control socket (err %d).\n",
2699 err);
2700 goto out;
2701 }
2702
2703 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2704
2705 err = igmp6_proc_init(net);
2706 if (err)
2707 goto out_sock_create;
2708 out:
2709 return err;
2710
2711 out_sock_create:
2712 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2713 goto out;
2714 }
2715
2716 static void igmp6_net_exit(struct net *net)
2717 {
2718 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2719 igmp6_proc_exit(net);
2720 }
2721
2722 static struct pernet_operations igmp6_net_ops = {
2723 .init = igmp6_net_init,
2724 .exit = igmp6_net_exit,
2725 };
2726
2727 int __init igmp6_init(void)
2728 {
2729 return register_pernet_subsys(&igmp6_net_ops);
2730 }
2731
2732 void igmp6_cleanup(void)
2733 {
2734 unregister_pernet_subsys(&igmp6_net_ops);
2735 }
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