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[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / mcast.c
1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
9 *
10 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18 /* Changes:
19 *
20 * yoshfuji : fix format of router-alert option
21 * YOSHIFUJI Hideaki @USAGI:
22 * Fixed source address for MLD message based on
23 * <draft-ietf-magma-mld-source-05.txt>.
24 * YOSHIFUJI Hideaki @USAGI:
25 * - Ignore Queries for invalid addresses.
26 * - MLD for link-local addresses.
27 * David L Stevens <dlstevens@us.ibm.com>:
28 * - MLDv2 support
29 */
30
31 #include <linux/config.h>
32 #include <linux/module.h>
33 #include <linux/errno.h>
34 #include <linux/types.h>
35 #include <linux/string.h>
36 #include <linux/socket.h>
37 #include <linux/sockios.h>
38 #include <linux/jiffies.h>
39 #include <linux/times.h>
40 #include <linux/net.h>
41 #include <linux/in.h>
42 #include <linux/in6.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/route.h>
46 #include <linux/init.h>
47 #include <linux/proc_fs.h>
48 #include <linux/seq_file.h>
49
50 #include <linux/netfilter.h>
51 #include <linux/netfilter_ipv6.h>
52
53 #include <net/sock.h>
54 #include <net/snmp.h>
55
56 #include <net/ipv6.h>
57 #include <net/protocol.h>
58 #include <net/if_inet6.h>
59 #include <net/ndisc.h>
60 #include <net/addrconf.h>
61 #include <net/ip6_route.h>
62
63 #include <net/ip6_checksum.h>
64
65 /* Set to 3 to get tracing... */
66 #define MCAST_DEBUG 2
67
68 #if MCAST_DEBUG >= 3
69 #define MDBG(x) printk x
70 #else
71 #define MDBG(x)
72 #endif
73
74 /*
75 * These header formats should be in a separate include file, but icmpv6.h
76 * doesn't have in6_addr defined in all cases, there is no __u128, and no
77 * other files reference these.
78 *
79 * +-DLS 4/14/03
80 */
81
82 /* Multicast Listener Discovery version 2 headers */
83
84 struct mld2_grec {
85 __u8 grec_type;
86 __u8 grec_auxwords;
87 __u16 grec_nsrcs;
88 struct in6_addr grec_mca;
89 struct in6_addr grec_src[0];
90 };
91
92 struct mld2_report {
93 __u8 type;
94 __u8 resv1;
95 __u16 csum;
96 __u16 resv2;
97 __u16 ngrec;
98 struct mld2_grec grec[0];
99 };
100
101 struct mld2_query {
102 __u8 type;
103 __u8 code;
104 __u16 csum;
105 __u16 mrc;
106 __u16 resv1;
107 struct in6_addr mca;
108 #if defined(__LITTLE_ENDIAN_BITFIELD)
109 __u8 qrv:3,
110 suppress:1,
111 resv2:4;
112 #elif defined(__BIG_ENDIAN_BITFIELD)
113 __u8 resv2:4,
114 suppress:1,
115 qrv:3;
116 #else
117 #error "Please fix <asm/byteorder.h>"
118 #endif
119 __u8 qqic;
120 __u16 nsrcs;
121 struct in6_addr srcs[0];
122 };
123
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 = 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(addr, NULL, 0, 0);
212 if (rt) {
213 dev = rt->rt6i_dev;
214 dev_hold(dev);
215 dst_release(&rt->u.dst);
216 }
217 } else
218 dev = dev_get_by_index(ifindex);
219
220 if (dev == NULL) {
221 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
222 return -ENODEV;
223 }
224
225 mc_lst->ifindex = dev->ifindex;
226 mc_lst->sfmode = MCAST_EXCLUDE;
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(mc_lst->ifindex)) != NULL) {
270 struct inet6_dev *idev = in6_dev_get(dev);
271
272 if (idev) {
273 (void) ip6_mc_leave_src(sk,mc_lst,idev);
274 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
275 in6_dev_put(idev);
276 }
277 dev_put(dev);
278 }
279 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
280 return 0;
281 }
282 }
283 write_unlock_bh(&ipv6_sk_mc_lock);
284
285 return -EADDRNOTAVAIL;
286 }
287
288 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
289 {
290 struct net_device *dev = NULL;
291 struct inet6_dev *idev = NULL;
292
293 if (ifindex == 0) {
294 struct rt6_info *rt;
295
296 rt = rt6_lookup(group, NULL, 0, 0);
297 if (rt) {
298 dev = rt->rt6i_dev;
299 dev_hold(dev);
300 dst_release(&rt->u.dst);
301 }
302 } else
303 dev = dev_get_by_index(ifindex);
304
305 if (!dev)
306 return NULL;
307 idev = in6_dev_get(dev);
308 if (!idev) {
309 dev_put(dev);
310 return NULL;
311 }
312 read_lock_bh(&idev->lock);
313 if (idev->dead) {
314 read_unlock_bh(&idev->lock);
315 in6_dev_put(idev);
316 dev_put(dev);
317 return NULL;
318 }
319 return idev;
320 }
321
322 void ipv6_sock_mc_close(struct sock *sk)
323 {
324 struct ipv6_pinfo *np = inet6_sk(sk);
325 struct ipv6_mc_socklist *mc_lst;
326
327 write_lock_bh(&ipv6_sk_mc_lock);
328 while ((mc_lst = np->ipv6_mc_list) != NULL) {
329 struct net_device *dev;
330
331 np->ipv6_mc_list = mc_lst->next;
332 write_unlock_bh(&ipv6_sk_mc_lock);
333
334 dev = dev_get_by_index(mc_lst->ifindex);
335 if (dev) {
336 struct inet6_dev *idev = in6_dev_get(dev);
337
338 if (idev) {
339 (void) ip6_mc_leave_src(sk, mc_lst, idev);
340 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
341 in6_dev_put(idev);
342 }
343 dev_put(dev);
344 }
345
346 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
347
348 write_lock_bh(&ipv6_sk_mc_lock);
349 }
350 write_unlock_bh(&ipv6_sk_mc_lock);
351 }
352
353 int ip6_mc_source(int add, int omode, struct sock *sk,
354 struct group_source_req *pgsr)
355 {
356 struct in6_addr *source, *group;
357 struct ipv6_mc_socklist *pmc;
358 struct net_device *dev;
359 struct inet6_dev *idev;
360 struct ipv6_pinfo *inet6 = inet6_sk(sk);
361 struct ip6_sf_socklist *psl;
362 int i, j, rv;
363 int leavegroup = 0;
364 int pmclocked = 0;
365 int err;
366
367 if (pgsr->gsr_group.ss_family != AF_INET6 ||
368 pgsr->gsr_source.ss_family != AF_INET6)
369 return -EINVAL;
370
371 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
372 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
373
374 if (!ipv6_addr_is_multicast(group))
375 return -EINVAL;
376
377 idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
378 if (!idev)
379 return -ENODEV;
380 dev = idev->dev;
381
382 err = -EADDRNOTAVAIL;
383
384 read_lock_bh(&ipv6_sk_mc_lock);
385 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
386 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
387 continue;
388 if (ipv6_addr_equal(&pmc->addr, group))
389 break;
390 }
391 if (!pmc) { /* must have a prior join */
392 err = -EINVAL;
393 goto done;
394 }
395 /* if a source filter was set, must be the same mode as before */
396 if (pmc->sflist) {
397 if (pmc->sfmode != omode) {
398 err = -EINVAL;
399 goto done;
400 }
401 } else if (pmc->sfmode != omode) {
402 /* allow mode switches for empty-set filters */
403 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
404 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
405 pmc->sfmode = omode;
406 }
407
408 write_lock_bh(&pmc->sflock);
409 pmclocked = 1;
410
411 psl = pmc->sflist;
412 if (!add) {
413 if (!psl)
414 goto done; /* err = -EADDRNOTAVAIL */
415 rv = !0;
416 for (i=0; i<psl->sl_count; i++) {
417 rv = memcmp(&psl->sl_addr[i], source,
418 sizeof(struct in6_addr));
419 if (rv == 0)
420 break;
421 }
422 if (rv) /* source not found */
423 goto done; /* err = -EADDRNOTAVAIL */
424
425 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
426 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
427 leavegroup = 1;
428 goto done;
429 }
430
431 /* update the interface filter */
432 ip6_mc_del_src(idev, group, omode, 1, source, 1);
433
434 for (j=i+1; j<psl->sl_count; j++)
435 psl->sl_addr[j-1] = psl->sl_addr[j];
436 psl->sl_count--;
437 err = 0;
438 goto done;
439 }
440 /* else, add a new source to the filter */
441
442 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
443 err = -ENOBUFS;
444 goto done;
445 }
446 if (!psl || psl->sl_count == psl->sl_max) {
447 struct ip6_sf_socklist *newpsl;
448 int count = IP6_SFBLOCK;
449
450 if (psl)
451 count += psl->sl_max;
452 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
453 IP6_SFLSIZE(count), GFP_ATOMIC);
454 if (!newpsl) {
455 err = -ENOBUFS;
456 goto done;
457 }
458 newpsl->sl_max = count;
459 newpsl->sl_count = count - IP6_SFBLOCK;
460 if (psl) {
461 for (i=0; i<psl->sl_count; i++)
462 newpsl->sl_addr[i] = psl->sl_addr[i];
463 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
464 }
465 pmc->sflist = psl = newpsl;
466 }
467 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
468 for (i=0; i<psl->sl_count; i++) {
469 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
470 if (rv == 0)
471 break;
472 }
473 if (rv == 0) /* address already there is an error */
474 goto done;
475 for (j=psl->sl_count-1; j>=i; j--)
476 psl->sl_addr[j+1] = psl->sl_addr[j];
477 psl->sl_addr[i] = *source;
478 psl->sl_count++;
479 err = 0;
480 /* update the interface list */
481 ip6_mc_add_src(idev, group, omode, 1, source, 1);
482 done:
483 if (pmclocked)
484 write_unlock_bh(&pmc->sflock);
485 read_unlock_bh(&ipv6_sk_mc_lock);
486 read_unlock_bh(&idev->lock);
487 in6_dev_put(idev);
488 dev_put(dev);
489 if (leavegroup)
490 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
491 return err;
492 }
493
494 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
495 {
496 struct in6_addr *group;
497 struct ipv6_mc_socklist *pmc;
498 struct net_device *dev;
499 struct inet6_dev *idev;
500 struct ipv6_pinfo *inet6 = inet6_sk(sk);
501 struct ip6_sf_socklist *newpsl, *psl;
502 int leavegroup = 0;
503 int i, err;
504
505 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
506
507 if (!ipv6_addr_is_multicast(group))
508 return -EINVAL;
509 if (gsf->gf_fmode != MCAST_INCLUDE &&
510 gsf->gf_fmode != MCAST_EXCLUDE)
511 return -EINVAL;
512
513 idev = ip6_mc_find_dev(group, gsf->gf_interface);
514
515 if (!idev)
516 return -ENODEV;
517 dev = idev->dev;
518
519 err = 0;
520 read_lock_bh(&ipv6_sk_mc_lock);
521
522 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
523 leavegroup = 1;
524 goto done;
525 }
526
527 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
528 if (pmc->ifindex != gsf->gf_interface)
529 continue;
530 if (ipv6_addr_equal(&pmc->addr, group))
531 break;
532 }
533 if (!pmc) { /* must have a prior join */
534 err = -EINVAL;
535 goto done;
536 }
537 if (gsf->gf_numsrc) {
538 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
539 IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
540 if (!newpsl) {
541 err = -ENOBUFS;
542 goto done;
543 }
544 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
545 for (i=0; i<newpsl->sl_count; ++i) {
546 struct sockaddr_in6 *psin6;
547
548 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
549 newpsl->sl_addr[i] = psin6->sin6_addr;
550 }
551 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
552 newpsl->sl_count, newpsl->sl_addr, 0);
553 if (err) {
554 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
555 goto done;
556 }
557 } else {
558 newpsl = NULL;
559 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
560 }
561
562 write_lock_bh(&pmc->sflock);
563 psl = pmc->sflist;
564 if (psl) {
565 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
566 psl->sl_count, psl->sl_addr, 0);
567 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
568 } else
569 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
570 pmc->sflist = newpsl;
571 pmc->sfmode = gsf->gf_fmode;
572 write_unlock_bh(&pmc->sflock);
573 err = 0;
574 done:
575 read_unlock_bh(&ipv6_sk_mc_lock);
576 read_unlock_bh(&idev->lock);
577 in6_dev_put(idev);
578 dev_put(dev);
579 if (leavegroup)
580 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
581 return err;
582 }
583
584 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
585 struct group_filter __user *optval, int __user *optlen)
586 {
587 int err, i, count, copycount;
588 struct in6_addr *group;
589 struct ipv6_mc_socklist *pmc;
590 struct inet6_dev *idev;
591 struct net_device *dev;
592 struct ipv6_pinfo *inet6 = inet6_sk(sk);
593 struct ip6_sf_socklist *psl;
594
595 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
596
597 if (!ipv6_addr_is_multicast(group))
598 return -EINVAL;
599
600 idev = ip6_mc_find_dev(group, gsf->gf_interface);
601
602 if (!idev)
603 return -ENODEV;
604
605 dev = idev->dev;
606
607 err = -EADDRNOTAVAIL;
608 /*
609 * changes to the ipv6_mc_list require the socket lock and
610 * a read lock on ip6_sk_mc_lock. We have the socket lock,
611 * so reading the list is safe.
612 */
613
614 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
615 if (pmc->ifindex != gsf->gf_interface)
616 continue;
617 if (ipv6_addr_equal(group, &pmc->addr))
618 break;
619 }
620 if (!pmc) /* must have a prior join */
621 goto done;
622 gsf->gf_fmode = pmc->sfmode;
623 psl = pmc->sflist;
624 count = psl ? psl->sl_count : 0;
625 read_unlock_bh(&idev->lock);
626 in6_dev_put(idev);
627 dev_put(dev);
628
629 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
630 gsf->gf_numsrc = count;
631 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
632 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
633 return -EFAULT;
634 }
635 /* changes to psl require the socket lock, a read lock on
636 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
637 * have the socket lock, so reading here is safe.
638 */
639 for (i=0; i<copycount; i++) {
640 struct sockaddr_in6 *psin6;
641 struct sockaddr_storage ss;
642
643 psin6 = (struct sockaddr_in6 *)&ss;
644 memset(&ss, 0, sizeof(ss));
645 psin6->sin6_family = AF_INET6;
646 psin6->sin6_addr = psl->sl_addr[i];
647 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
648 return -EFAULT;
649 }
650 return 0;
651 done:
652 read_unlock_bh(&idev->lock);
653 in6_dev_put(idev);
654 dev_put(dev);
655 return err;
656 }
657
658 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
659 struct in6_addr *src_addr)
660 {
661 struct ipv6_pinfo *np = inet6_sk(sk);
662 struct ipv6_mc_socklist *mc;
663 struct ip6_sf_socklist *psl;
664 int rv = 1;
665
666 read_lock(&ipv6_sk_mc_lock);
667 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
668 if (ipv6_addr_equal(&mc->addr, mc_addr))
669 break;
670 }
671 if (!mc) {
672 read_unlock(&ipv6_sk_mc_lock);
673 return 1;
674 }
675 read_lock(&mc->sflock);
676 psl = mc->sflist;
677 if (!psl) {
678 rv = mc->sfmode == MCAST_EXCLUDE;
679 } else {
680 int i;
681
682 for (i=0; i<psl->sl_count; i++) {
683 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
684 break;
685 }
686 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
687 rv = 0;
688 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
689 rv = 0;
690 }
691 read_unlock(&mc->sflock);
692 read_unlock(&ipv6_sk_mc_lock);
693
694 return rv;
695 }
696
697 static void ma_put(struct ifmcaddr6 *mc)
698 {
699 if (atomic_dec_and_test(&mc->mca_refcnt)) {
700 in6_dev_put(mc->idev);
701 kfree(mc);
702 }
703 }
704
705 static void igmp6_group_added(struct ifmcaddr6 *mc)
706 {
707 struct net_device *dev = mc->idev->dev;
708 char buf[MAX_ADDR_LEN];
709
710 spin_lock_bh(&mc->mca_lock);
711 if (!(mc->mca_flags&MAF_LOADED)) {
712 mc->mca_flags |= MAF_LOADED;
713 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
714 dev_mc_add(dev, buf, dev->addr_len, 0);
715 }
716 spin_unlock_bh(&mc->mca_lock);
717
718 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
719 return;
720
721 if (MLD_V1_SEEN(mc->idev)) {
722 igmp6_join_group(mc);
723 return;
724 }
725 /* else v2 */
726
727 mc->mca_crcount = mc->idev->mc_qrv;
728 mld_ifc_event(mc->idev);
729 }
730
731 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
732 {
733 struct net_device *dev = mc->idev->dev;
734 char buf[MAX_ADDR_LEN];
735
736 spin_lock_bh(&mc->mca_lock);
737 if (mc->mca_flags&MAF_LOADED) {
738 mc->mca_flags &= ~MAF_LOADED;
739 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
740 dev_mc_delete(dev, buf, dev->addr_len, 0);
741 }
742
743 if (mc->mca_flags & MAF_NOREPORT)
744 goto done;
745 spin_unlock_bh(&mc->mca_lock);
746
747 if (!mc->idev->dead)
748 igmp6_leave_group(mc);
749
750 spin_lock_bh(&mc->mca_lock);
751 if (del_timer(&mc->mca_timer))
752 atomic_dec(&mc->mca_refcnt);
753 done:
754 ip6_mc_clear_src(mc);
755 spin_unlock_bh(&mc->mca_lock);
756 }
757
758 /*
759 * deleted ifmcaddr6 manipulation
760 */
761 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
762 {
763 struct ifmcaddr6 *pmc;
764
765 /* this is an "ifmcaddr6" for convenience; only the fields below
766 * are actually used. In particular, the refcnt and users are not
767 * used for management of the delete list. Using the same structure
768 * for deleted items allows change reports to use common code with
769 * non-deleted or query-response MCA's.
770 */
771 pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
772 if (!pmc)
773 return;
774 memset(pmc, 0, sizeof(*pmc));
775 spin_lock_bh(&im->mca_lock);
776 spin_lock_init(&pmc->mca_lock);
777 pmc->idev = im->idev;
778 in6_dev_hold(idev);
779 pmc->mca_addr = im->mca_addr;
780 pmc->mca_crcount = idev->mc_qrv;
781 pmc->mca_sfmode = im->mca_sfmode;
782 if (pmc->mca_sfmode == MCAST_INCLUDE) {
783 struct ip6_sf_list *psf;
784
785 pmc->mca_tomb = im->mca_tomb;
786 pmc->mca_sources = im->mca_sources;
787 im->mca_tomb = im->mca_sources = NULL;
788 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
789 psf->sf_crcount = pmc->mca_crcount;
790 }
791 spin_unlock_bh(&im->mca_lock);
792
793 write_lock_bh(&idev->mc_lock);
794 pmc->next = idev->mc_tomb;
795 idev->mc_tomb = pmc;
796 write_unlock_bh(&idev->mc_lock);
797 }
798
799 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
800 {
801 struct ifmcaddr6 *pmc, *pmc_prev;
802 struct ip6_sf_list *psf, *psf_next;
803
804 write_lock_bh(&idev->mc_lock);
805 pmc_prev = NULL;
806 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
807 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
808 break;
809 pmc_prev = pmc;
810 }
811 if (pmc) {
812 if (pmc_prev)
813 pmc_prev->next = pmc->next;
814 else
815 idev->mc_tomb = pmc->next;
816 }
817 write_unlock_bh(&idev->mc_lock);
818 if (pmc) {
819 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
820 psf_next = psf->sf_next;
821 kfree(psf);
822 }
823 in6_dev_put(pmc->idev);
824 kfree(pmc);
825 }
826 }
827
828 static void mld_clear_delrec(struct inet6_dev *idev)
829 {
830 struct ifmcaddr6 *pmc, *nextpmc;
831
832 write_lock_bh(&idev->mc_lock);
833 pmc = idev->mc_tomb;
834 idev->mc_tomb = NULL;
835 write_unlock_bh(&idev->mc_lock);
836
837 for (; pmc; pmc = nextpmc) {
838 nextpmc = pmc->next;
839 ip6_mc_clear_src(pmc);
840 in6_dev_put(pmc->idev);
841 kfree(pmc);
842 }
843
844 /* clear dead sources, too */
845 read_lock_bh(&idev->lock);
846 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
847 struct ip6_sf_list *psf, *psf_next;
848
849 spin_lock_bh(&pmc->mca_lock);
850 psf = pmc->mca_tomb;
851 pmc->mca_tomb = NULL;
852 spin_unlock_bh(&pmc->mca_lock);
853 for (; psf; psf=psf_next) {
854 psf_next = psf->sf_next;
855 kfree(psf);
856 }
857 }
858 read_unlock_bh(&idev->lock);
859 }
860
861
862 /*
863 * device multicast group inc (add if not found)
864 */
865 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
866 {
867 struct ifmcaddr6 *mc;
868 struct inet6_dev *idev;
869
870 idev = in6_dev_get(dev);
871
872 if (idev == NULL)
873 return -EINVAL;
874
875 write_lock_bh(&idev->lock);
876 if (idev->dead) {
877 write_unlock_bh(&idev->lock);
878 in6_dev_put(idev);
879 return -ENODEV;
880 }
881
882 for (mc = idev->mc_list; mc; mc = mc->next) {
883 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
884 mc->mca_users++;
885 write_unlock_bh(&idev->lock);
886 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
887 NULL, 0);
888 in6_dev_put(idev);
889 return 0;
890 }
891 }
892
893 /*
894 * not found: create a new one.
895 */
896
897 mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
898
899 if (mc == NULL) {
900 write_unlock_bh(&idev->lock);
901 in6_dev_put(idev);
902 return -ENOMEM;
903 }
904
905 memset(mc, 0, sizeof(struct ifmcaddr6));
906 init_timer(&mc->mca_timer);
907 mc->mca_timer.function = igmp6_timer_handler;
908 mc->mca_timer.data = (unsigned long) mc;
909
910 ipv6_addr_copy(&mc->mca_addr, addr);
911 mc->idev = idev;
912 mc->mca_users = 1;
913 /* mca_stamp should be updated upon changes */
914 mc->mca_cstamp = mc->mca_tstamp = jiffies;
915 atomic_set(&mc->mca_refcnt, 2);
916 spin_lock_init(&mc->mca_lock);
917
918 /* initial mode is (EX, empty) */
919 mc->mca_sfmode = MCAST_EXCLUDE;
920 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
921
922 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
923 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
924 mc->mca_flags |= MAF_NOREPORT;
925
926 mc->next = idev->mc_list;
927 idev->mc_list = mc;
928 write_unlock_bh(&idev->lock);
929
930 mld_del_delrec(idev, &mc->mca_addr);
931 igmp6_group_added(mc);
932 ma_put(mc);
933 return 0;
934 }
935
936 /*
937 * device multicast group del
938 */
939 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
940 {
941 struct ifmcaddr6 *ma, **map;
942
943 write_lock_bh(&idev->lock);
944 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
945 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
946 if (--ma->mca_users == 0) {
947 *map = ma->next;
948 write_unlock_bh(&idev->lock);
949
950 igmp6_group_dropped(ma);
951
952 ma_put(ma);
953 return 0;
954 }
955 write_unlock_bh(&idev->lock);
956 return 0;
957 }
958 }
959 write_unlock_bh(&idev->lock);
960
961 return -ENOENT;
962 }
963
964 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
965 {
966 struct inet6_dev *idev = in6_dev_get(dev);
967 int err;
968
969 if (!idev)
970 return -ENODEV;
971
972 err = __ipv6_dev_mc_dec(idev, addr);
973
974 in6_dev_put(idev);
975
976 return err;
977 }
978
979 /*
980 * identify MLD packets for MLD filter exceptions
981 */
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 = (struct icmp6hdr *)skb->h.raw;
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, struct in6_addr *group,
1010 struct in6_addr *src_addr)
1011 {
1012 struct inet6_dev *idev;
1013 struct ifmcaddr6 *mc;
1014 int rv = 0;
1015
1016 idev = in6_dev_get(dev);
1017 if (idev) {
1018 read_lock_bh(&idev->lock);
1019 for (mc = idev->mc_list; mc; mc=mc->next) {
1020 if (ipv6_addr_equal(&mc->mca_addr, group))
1021 break;
1022 }
1023 if (mc) {
1024 if (src_addr && !ipv6_addr_any(src_addr)) {
1025 struct ip6_sf_list *psf;
1026
1027 spin_lock_bh(&mc->mca_lock);
1028 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1029 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1030 break;
1031 }
1032 if (psf)
1033 rv = psf->sf_count[MCAST_INCLUDE] ||
1034 psf->sf_count[MCAST_EXCLUDE] !=
1035 mc->mca_sfcount[MCAST_EXCLUDE];
1036 else
1037 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1038 spin_unlock_bh(&mc->mca_lock);
1039 } else
1040 rv = 1; /* don't filter unspecified source */
1041 }
1042 read_unlock_bh(&idev->lock);
1043 in6_dev_put(idev);
1044 }
1045 return rv;
1046 }
1047
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(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1172 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1173
1174 /* Drop queries with not link local source */
1175 if (!(ipv6_addr_type(&skb->nh.ipv6h->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 = (struct icmp6hdr *) skb->h.raw;
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->h.raw;
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->h.raw;
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 (group_type != IPV6_ADDR_ANY &&
1257 !ipv6_addr_equal(group, &ma->mca_addr))
1258 continue;
1259 spin_lock_bh(&ma->mca_lock);
1260 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1261 /* gsquery <- gsquery && mark */
1262 if (!mark)
1263 ma->mca_flags &= ~MAF_GSQUERY;
1264 } else {
1265 /* gsquery <- mark */
1266 if (mark)
1267 ma->mca_flags |= MAF_GSQUERY;
1268 else
1269 ma->mca_flags &= ~MAF_GSQUERY;
1270 }
1271 if (!(ma->mca_flags & MAF_GSQUERY) ||
1272 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1273 igmp6_group_queried(ma, max_delay);
1274 spin_unlock_bh(&ma->mca_lock);
1275 if (group_type != IPV6_ADDR_ANY)
1276 break;
1277 }
1278 }
1279 read_unlock_bh(&idev->lock);
1280 in6_dev_put(idev);
1281
1282 return 0;
1283 }
1284
1285
1286 int igmp6_event_report(struct sk_buff *skb)
1287 {
1288 struct ifmcaddr6 *ma;
1289 struct in6_addr *addrp;
1290 struct inet6_dev *idev;
1291 struct icmp6hdr *hdr;
1292 int addr_type;
1293
1294 /* Our own report looped back. Ignore it. */
1295 if (skb->pkt_type == PACKET_LOOPBACK)
1296 return 0;
1297
1298 /* send our report if the MC router may not have heard this report */
1299 if (skb->pkt_type != PACKET_MULTICAST &&
1300 skb->pkt_type != PACKET_BROADCAST)
1301 return 0;
1302
1303 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1304 return -EINVAL;
1305
1306 hdr = (struct icmp6hdr*) skb->h.raw;
1307
1308 /* Drop reports with not link local source */
1309 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1310 if (addr_type != IPV6_ADDR_ANY &&
1311 !(addr_type&IPV6_ADDR_LINKLOCAL))
1312 return -EINVAL;
1313
1314 addrp = (struct in6_addr *) (hdr + 1);
1315
1316 idev = in6_dev_get(skb->dev);
1317 if (idev == NULL)
1318 return -ENODEV;
1319
1320 /*
1321 * Cancel the timer for this group
1322 */
1323
1324 read_lock_bh(&idev->lock);
1325 for (ma = idev->mc_list; ma; ma=ma->next) {
1326 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1327 spin_lock(&ma->mca_lock);
1328 if (del_timer(&ma->mca_timer))
1329 atomic_dec(&ma->mca_refcnt);
1330 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1331 spin_unlock(&ma->mca_lock);
1332 break;
1333 }
1334 }
1335 read_unlock_bh(&idev->lock);
1336 in6_dev_put(idev);
1337 return 0;
1338 }
1339
1340 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1341 int gdeleted, int sdeleted)
1342 {
1343 switch (type) {
1344 case MLD2_MODE_IS_INCLUDE:
1345 case MLD2_MODE_IS_EXCLUDE:
1346 if (gdeleted || sdeleted)
1347 return 0;
1348 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1349 if (pmc->mca_sfmode == MCAST_INCLUDE)
1350 return 1;
1351 /* don't include if this source is excluded
1352 * in all filters
1353 */
1354 if (psf->sf_count[MCAST_INCLUDE])
1355 return 0;
1356 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1357 psf->sf_count[MCAST_EXCLUDE];
1358 }
1359 return 0;
1360 case MLD2_CHANGE_TO_INCLUDE:
1361 if (gdeleted || sdeleted)
1362 return 0;
1363 return psf->sf_count[MCAST_INCLUDE] != 0;
1364 case MLD2_CHANGE_TO_EXCLUDE:
1365 if (gdeleted || sdeleted)
1366 return 0;
1367 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1368 psf->sf_count[MCAST_INCLUDE])
1369 return 0;
1370 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1371 psf->sf_count[MCAST_EXCLUDE];
1372 case MLD2_ALLOW_NEW_SOURCES:
1373 if (gdeleted || !psf->sf_crcount)
1374 return 0;
1375 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1376 case MLD2_BLOCK_OLD_SOURCES:
1377 if (pmc->mca_sfmode == MCAST_INCLUDE)
1378 return gdeleted || (psf->sf_crcount && sdeleted);
1379 return psf->sf_crcount && !gdeleted && !sdeleted;
1380 }
1381 return 0;
1382 }
1383
1384 static int
1385 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1386 {
1387 struct ip6_sf_list *psf;
1388 int scount = 0;
1389
1390 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1391 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1392 continue;
1393 scount++;
1394 }
1395 return scount;
1396 }
1397
1398 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1399 {
1400 struct sock *sk = igmp6_socket->sk;
1401 struct sk_buff *skb;
1402 struct mld2_report *pmr;
1403 struct in6_addr addr_buf;
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_RESERVED_SPACE(dev), 1, &err);
1411
1412 if (skb == 0)
1413 return NULL;
1414
1415 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1416
1417 if (ipv6_get_lladdr(dev, &addr_buf)) {
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 memset(&addr_buf, 0, sizeof(addr_buf));
1423 }
1424
1425 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1426
1427 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1428
1429 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1430 skb->h.raw = (unsigned char *)pmr;
1431 pmr->type = ICMPV6_MLD2_REPORT;
1432 pmr->resv1 = 0;
1433 pmr->csum = 0;
1434 pmr->resv2 = 0;
1435 pmr->ngrec = 0;
1436 return skb;
1437 }
1438
1439 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1440 {
1441 struct net_device *dev = skb->dev;
1442
1443 if (dev->hard_header) {
1444 unsigned char ha[MAX_ADDR_LEN];
1445 int err;
1446
1447 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1448 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1449 if (err < 0) {
1450 kfree_skb(skb);
1451 return err;
1452 }
1453 }
1454 return dev_queue_xmit(skb);
1455 }
1456
1457 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1458 {
1459 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1460 mld_dev_queue_xmit2);
1461 }
1462
1463 static void mld_sendpack(struct sk_buff *skb)
1464 {
1465 struct ipv6hdr *pip6 = skb->nh.ipv6h;
1466 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1467 int payload_len, mldlen;
1468 struct inet6_dev *idev = in6_dev_get(skb->dev);
1469 int err;
1470
1471 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1472 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1473 sizeof(struct ipv6hdr);
1474 mldlen = skb->tail - skb->h.raw;
1475 pip6->payload_len = htons(payload_len);
1476
1477 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1478 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1479 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1480 mld_dev_queue_xmit);
1481 if (!err) {
1482 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1483 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1484 } else
1485 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1486
1487 if (likely(idev != NULL))
1488 in6_dev_put(idev);
1489 }
1490
1491 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1492 {
1493 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1494 }
1495
1496 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1497 int type, struct mld2_grec **ppgr)
1498 {
1499 struct net_device *dev = pmc->idev->dev;
1500 struct mld2_report *pmr;
1501 struct mld2_grec *pgr;
1502
1503 if (!skb)
1504 skb = mld_newpack(dev, dev->mtu);
1505 if (!skb)
1506 return NULL;
1507 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1508 pgr->grec_type = type;
1509 pgr->grec_auxwords = 0;
1510 pgr->grec_nsrcs = 0;
1511 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1512 pmr = (struct mld2_report *)skb->h.raw;
1513 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1514 *ppgr = pgr;
1515 return skb;
1516 }
1517
1518 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1519 skb_tailroom(skb)) : 0)
1520
1521 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1522 int type, int gdeleted, int sdeleted)
1523 {
1524 struct net_device *dev = pmc->idev->dev;
1525 struct mld2_report *pmr;
1526 struct mld2_grec *pgr = NULL;
1527 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1528 int scount, stotal, first, isquery, truncate;
1529
1530 if (pmc->mca_flags & MAF_NOREPORT)
1531 return skb;
1532
1533 isquery = type == MLD2_MODE_IS_INCLUDE ||
1534 type == MLD2_MODE_IS_EXCLUDE;
1535 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1536 type == MLD2_CHANGE_TO_EXCLUDE;
1537
1538 stotal = scount = 0;
1539
1540 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1541
1542 if (!*psf_list)
1543 goto empty_source;
1544
1545 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1546
1547 /* EX and TO_EX get a fresh packet, if needed */
1548 if (truncate) {
1549 if (pmr && pmr->ngrec &&
1550 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1551 if (skb)
1552 mld_sendpack(skb);
1553 skb = mld_newpack(dev, dev->mtu);
1554 }
1555 }
1556 first = 1;
1557 psf_prev = NULL;
1558 for (psf=*psf_list; psf; psf=psf_next) {
1559 struct in6_addr *psrc;
1560
1561 psf_next = psf->sf_next;
1562
1563 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1564 psf_prev = psf;
1565 continue;
1566 }
1567
1568 /* clear marks on query responses */
1569 if (isquery)
1570 psf->sf_gsresp = 0;
1571
1572 if (AVAILABLE(skb) < sizeof(*psrc) +
1573 first*sizeof(struct mld2_grec)) {
1574 if (truncate && !first)
1575 break; /* truncate these */
1576 if (pgr)
1577 pgr->grec_nsrcs = htons(scount);
1578 if (skb)
1579 mld_sendpack(skb);
1580 skb = mld_newpack(dev, dev->mtu);
1581 first = 1;
1582 scount = 0;
1583 }
1584 if (first) {
1585 skb = add_grhead(skb, pmc, type, &pgr);
1586 first = 0;
1587 }
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
1769 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1770 snd_addr = addr;
1771 if (type == ICMPV6_MGM_REDUCTION) {
1772 snd_addr = &all_routers;
1773 ipv6_addr_all_routers(&all_routers);
1774 }
1775
1776 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1777 payload_len = len + sizeof(ra);
1778 full_len = sizeof(struct ipv6hdr) + payload_len;
1779
1780 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1781
1782 if (skb == NULL) {
1783 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1784 return;
1785 }
1786
1787 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1788
1789 if (ipv6_get_lladdr(dev, &addr_buf)) {
1790 /* <draft-ietf-magma-mld-source-05.txt>:
1791 * use unspecified address as the source address
1792 * when a valid link-local address is not available.
1793 */
1794 memset(&addr_buf, 0, sizeof(addr_buf));
1795 }
1796
1797 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1798
1799 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1800
1801 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1802 memset(hdr, 0, sizeof(struct icmp6hdr));
1803 hdr->icmp6_type = type;
1804
1805 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1806 ipv6_addr_copy(addrp, addr);
1807
1808 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1809 IPPROTO_ICMPV6,
1810 csum_partial((__u8 *) hdr, len, 0));
1811
1812 idev = in6_dev_get(skb->dev);
1813
1814 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1815 mld_dev_queue_xmit);
1816 if (!err) {
1817 if (type == ICMPV6_MGM_REDUCTION)
1818 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1819 else
1820 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1821 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1822 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1823 } else
1824 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1825
1826 if (likely(idev != NULL))
1827 in6_dev_put(idev);
1828 return;
1829 }
1830
1831 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1832 struct in6_addr *psfsrc)
1833 {
1834 struct ip6_sf_list *psf, *psf_prev;
1835 int rv = 0;
1836
1837 psf_prev = NULL;
1838 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1839 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1840 break;
1841 psf_prev = psf;
1842 }
1843 if (!psf || psf->sf_count[sfmode] == 0) {
1844 /* source filter not found, or count wrong => bug */
1845 return -ESRCH;
1846 }
1847 psf->sf_count[sfmode]--;
1848 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1849 struct inet6_dev *idev = pmc->idev;
1850
1851 /* no more filters for this source */
1852 if (psf_prev)
1853 psf_prev->sf_next = psf->sf_next;
1854 else
1855 pmc->mca_sources = psf->sf_next;
1856 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1857 !MLD_V1_SEEN(idev)) {
1858 psf->sf_crcount = idev->mc_qrv;
1859 psf->sf_next = pmc->mca_tomb;
1860 pmc->mca_tomb = psf;
1861 rv = 1;
1862 } else
1863 kfree(psf);
1864 }
1865 return rv;
1866 }
1867
1868 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1869 int sfmode, int sfcount, struct in6_addr *psfsrc,
1870 int delta)
1871 {
1872 struct ifmcaddr6 *pmc;
1873 int changerec = 0;
1874 int i, err;
1875
1876 if (!idev)
1877 return -ENODEV;
1878 read_lock_bh(&idev->lock);
1879 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1880 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1881 break;
1882 }
1883 if (!pmc) {
1884 /* MCA not found?? bug */
1885 read_unlock_bh(&idev->lock);
1886 return -ESRCH;
1887 }
1888 spin_lock_bh(&pmc->mca_lock);
1889 sf_markstate(pmc);
1890 if (!delta) {
1891 if (!pmc->mca_sfcount[sfmode]) {
1892 spin_unlock_bh(&pmc->mca_lock);
1893 read_unlock_bh(&idev->lock);
1894 return -EINVAL;
1895 }
1896 pmc->mca_sfcount[sfmode]--;
1897 }
1898 err = 0;
1899 for (i=0; i<sfcount; i++) {
1900 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1901
1902 changerec |= rv > 0;
1903 if (!err && rv < 0)
1904 err = rv;
1905 }
1906 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1907 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1908 pmc->mca_sfcount[MCAST_INCLUDE]) {
1909 struct ip6_sf_list *psf;
1910
1911 /* filter mode change */
1912 pmc->mca_sfmode = MCAST_INCLUDE;
1913 pmc->mca_crcount = idev->mc_qrv;
1914 idev->mc_ifc_count = pmc->mca_crcount;
1915 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1916 psf->sf_crcount = 0;
1917 mld_ifc_event(pmc->idev);
1918 } else if (sf_setstate(pmc) || changerec)
1919 mld_ifc_event(pmc->idev);
1920 spin_unlock_bh(&pmc->mca_lock);
1921 read_unlock_bh(&idev->lock);
1922 return err;
1923 }
1924
1925 /*
1926 * Add multicast single-source filter to the interface list
1927 */
1928 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1929 struct in6_addr *psfsrc, int delta)
1930 {
1931 struct ip6_sf_list *psf, *psf_prev;
1932
1933 psf_prev = NULL;
1934 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1935 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1936 break;
1937 psf_prev = psf;
1938 }
1939 if (!psf) {
1940 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1941 if (!psf)
1942 return -ENOBUFS;
1943 memset(psf, 0, sizeof(*psf));
1944 psf->sf_addr = *psfsrc;
1945 if (psf_prev) {
1946 psf_prev->sf_next = psf;
1947 } else
1948 pmc->mca_sources = psf;
1949 }
1950 psf->sf_count[sfmode]++;
1951 return 0;
1952 }
1953
1954 static void sf_markstate(struct ifmcaddr6 *pmc)
1955 {
1956 struct ip6_sf_list *psf;
1957 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1958
1959 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1960 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1961 psf->sf_oldin = mca_xcount ==
1962 psf->sf_count[MCAST_EXCLUDE] &&
1963 !psf->sf_count[MCAST_INCLUDE];
1964 } else
1965 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1966 }
1967
1968 static int sf_setstate(struct ifmcaddr6 *pmc)
1969 {
1970 struct ip6_sf_list *psf;
1971 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1972 int qrv = pmc->idev->mc_qrv;
1973 int new_in, rv;
1974
1975 rv = 0;
1976 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1977 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1978 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1979 !psf->sf_count[MCAST_INCLUDE];
1980 } else
1981 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1982 if (new_in != psf->sf_oldin) {
1983 psf->sf_crcount = qrv;
1984 rv++;
1985 }
1986 }
1987 return rv;
1988 }
1989
1990 /*
1991 * Add multicast source filter list to the interface list
1992 */
1993 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
1994 int sfmode, int sfcount, struct in6_addr *psfsrc,
1995 int delta)
1996 {
1997 struct ifmcaddr6 *pmc;
1998 int isexclude;
1999 int i, err;
2000
2001 if (!idev)
2002 return -ENODEV;
2003 read_lock_bh(&idev->lock);
2004 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2005 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2006 break;
2007 }
2008 if (!pmc) {
2009 /* MCA not found?? bug */
2010 read_unlock_bh(&idev->lock);
2011 return -ESRCH;
2012 }
2013 spin_lock_bh(&pmc->mca_lock);
2014
2015 sf_markstate(pmc);
2016 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2017 if (!delta)
2018 pmc->mca_sfcount[sfmode]++;
2019 err = 0;
2020 for (i=0; i<sfcount; i++) {
2021 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2022 if (err)
2023 break;
2024 }
2025 if (err) {
2026 int j;
2027
2028 if (!delta)
2029 pmc->mca_sfcount[sfmode]--;
2030 for (j=0; j<i; j++)
2031 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2032 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2033 struct inet6_dev *idev = pmc->idev;
2034 struct ip6_sf_list *psf;
2035
2036 /* filter mode change */
2037 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2038 pmc->mca_sfmode = MCAST_EXCLUDE;
2039 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2040 pmc->mca_sfmode = MCAST_INCLUDE;
2041 /* else no filters; keep old mode for reports */
2042
2043 pmc->mca_crcount = idev->mc_qrv;
2044 idev->mc_ifc_count = pmc->mca_crcount;
2045 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2046 psf->sf_crcount = 0;
2047 mld_ifc_event(idev);
2048 } else if (sf_setstate(pmc))
2049 mld_ifc_event(idev);
2050 spin_unlock_bh(&pmc->mca_lock);
2051 read_unlock_bh(&idev->lock);
2052 return err;
2053 }
2054
2055 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2056 {
2057 struct ip6_sf_list *psf, *nextpsf;
2058
2059 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2060 nextpsf = psf->sf_next;
2061 kfree(psf);
2062 }
2063 pmc->mca_tomb = NULL;
2064 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2065 nextpsf = psf->sf_next;
2066 kfree(psf);
2067 }
2068 pmc->mca_sources = NULL;
2069 pmc->mca_sfmode = MCAST_EXCLUDE;
2070 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2071 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2072 }
2073
2074
2075 static void igmp6_join_group(struct ifmcaddr6 *ma)
2076 {
2077 unsigned long delay;
2078
2079 if (ma->mca_flags & MAF_NOREPORT)
2080 return;
2081
2082 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2083
2084 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2085
2086 spin_lock_bh(&ma->mca_lock);
2087 if (del_timer(&ma->mca_timer)) {
2088 atomic_dec(&ma->mca_refcnt);
2089 delay = ma->mca_timer.expires - jiffies;
2090 }
2091
2092 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2093 atomic_inc(&ma->mca_refcnt);
2094 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2095 spin_unlock_bh(&ma->mca_lock);
2096 }
2097
2098 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2099 struct inet6_dev *idev)
2100 {
2101 int err;
2102
2103 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2104 * so no other readers or writers of iml or its sflist
2105 */
2106 if (iml->sflist == 0) {
2107 /* any-source empty exclude case */
2108 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2109 }
2110 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2111 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2112 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2113 iml->sflist = NULL;
2114 return err;
2115 }
2116
2117 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2118 {
2119 if (MLD_V1_SEEN(ma->idev)) {
2120 if (ma->mca_flags & MAF_LAST_REPORTER)
2121 igmp6_send(&ma->mca_addr, ma->idev->dev,
2122 ICMPV6_MGM_REDUCTION);
2123 } else {
2124 mld_add_delrec(ma->idev, ma);
2125 mld_ifc_event(ma->idev);
2126 }
2127 }
2128
2129 static void mld_gq_timer_expire(unsigned long data)
2130 {
2131 struct inet6_dev *idev = (struct inet6_dev *)data;
2132
2133 idev->mc_gq_running = 0;
2134 mld_send_report(idev, NULL);
2135 __in6_dev_put(idev);
2136 }
2137
2138 static void mld_ifc_timer_expire(unsigned long data)
2139 {
2140 struct inet6_dev *idev = (struct inet6_dev *)data;
2141
2142 mld_send_cr(idev);
2143 if (idev->mc_ifc_count) {
2144 idev->mc_ifc_count--;
2145 if (idev->mc_ifc_count)
2146 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2147 }
2148 __in6_dev_put(idev);
2149 }
2150
2151 static void mld_ifc_event(struct inet6_dev *idev)
2152 {
2153 if (MLD_V1_SEEN(idev))
2154 return;
2155 idev->mc_ifc_count = idev->mc_qrv;
2156 mld_ifc_start_timer(idev, 1);
2157 }
2158
2159
2160 static void igmp6_timer_handler(unsigned long data)
2161 {
2162 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2163
2164 if (MLD_V1_SEEN(ma->idev))
2165 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2166 else
2167 mld_send_report(ma->idev, ma);
2168
2169 spin_lock(&ma->mca_lock);
2170 ma->mca_flags |= MAF_LAST_REPORTER;
2171 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2172 spin_unlock(&ma->mca_lock);
2173 ma_put(ma);
2174 }
2175
2176 /* Device going down */
2177
2178 void ipv6_mc_down(struct inet6_dev *idev)
2179 {
2180 struct ifmcaddr6 *i;
2181
2182 /* Withdraw multicast list */
2183
2184 read_lock_bh(&idev->lock);
2185 idev->mc_ifc_count = 0;
2186 if (del_timer(&idev->mc_ifc_timer))
2187 __in6_dev_put(idev);
2188 idev->mc_gq_running = 0;
2189 if (del_timer(&idev->mc_gq_timer))
2190 __in6_dev_put(idev);
2191
2192 for (i = idev->mc_list; i; i=i->next)
2193 igmp6_group_dropped(i);
2194 read_unlock_bh(&idev->lock);
2195
2196 mld_clear_delrec(idev);
2197 }
2198
2199
2200 /* Device going up */
2201
2202 void ipv6_mc_up(struct inet6_dev *idev)
2203 {
2204 struct ifmcaddr6 *i;
2205
2206 /* Install multicast list, except for all-nodes (already installed) */
2207
2208 read_lock_bh(&idev->lock);
2209 for (i = idev->mc_list; i; i=i->next)
2210 igmp6_group_added(i);
2211 read_unlock_bh(&idev->lock);
2212 }
2213
2214 /* IPv6 device initialization. */
2215
2216 void ipv6_mc_init_dev(struct inet6_dev *idev)
2217 {
2218 struct in6_addr maddr;
2219
2220 write_lock_bh(&idev->lock);
2221 rwlock_init(&idev->mc_lock);
2222 idev->mc_gq_running = 0;
2223 init_timer(&idev->mc_gq_timer);
2224 idev->mc_gq_timer.data = (unsigned long) idev;
2225 idev->mc_gq_timer.function = &mld_gq_timer_expire;
2226 idev->mc_tomb = NULL;
2227 idev->mc_ifc_count = 0;
2228 init_timer(&idev->mc_ifc_timer);
2229 idev->mc_ifc_timer.data = (unsigned long) idev;
2230 idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2231 idev->mc_qrv = MLD_QRV_DEFAULT;
2232 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2233 idev->mc_v1_seen = 0;
2234 write_unlock_bh(&idev->lock);
2235
2236 /* Add all-nodes address. */
2237 ipv6_addr_all_nodes(&maddr);
2238 ipv6_dev_mc_inc(idev->dev, &maddr);
2239 }
2240
2241 /*
2242 * Device is about to be destroyed: clean up.
2243 */
2244
2245 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2246 {
2247 struct ifmcaddr6 *i;
2248 struct in6_addr maddr;
2249
2250 /* Deactivate timers */
2251 ipv6_mc_down(idev);
2252
2253 /* Delete all-nodes address. */
2254 ipv6_addr_all_nodes(&maddr);
2255
2256 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2257 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2258 * fail.
2259 */
2260 __ipv6_dev_mc_dec(idev, &maddr);
2261
2262 if (idev->cnf.forwarding) {
2263 ipv6_addr_all_routers(&maddr);
2264 __ipv6_dev_mc_dec(idev, &maddr);
2265 }
2266
2267 write_lock_bh(&idev->lock);
2268 while ((i = idev->mc_list) != NULL) {
2269 idev->mc_list = i->next;
2270 write_unlock_bh(&idev->lock);
2271
2272 igmp6_group_dropped(i);
2273 ma_put(i);
2274
2275 write_lock_bh(&idev->lock);
2276 }
2277 write_unlock_bh(&idev->lock);
2278 }
2279
2280 #ifdef CONFIG_PROC_FS
2281 struct igmp6_mc_iter_state {
2282 struct net_device *dev;
2283 struct inet6_dev *idev;
2284 };
2285
2286 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2287
2288 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2289 {
2290 struct ifmcaddr6 *im = NULL;
2291 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2292
2293 for (state->dev = dev_base, state->idev = NULL;
2294 state->dev;
2295 state->dev = state->dev->next) {
2296 struct inet6_dev *idev;
2297 idev = in6_dev_get(state->dev);
2298 if (!idev)
2299 continue;
2300 read_lock_bh(&idev->lock);
2301 im = idev->mc_list;
2302 if (im) {
2303 state->idev = idev;
2304 break;
2305 }
2306 read_unlock_bh(&idev->lock);
2307 in6_dev_put(idev);
2308 }
2309 return im;
2310 }
2311
2312 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2313 {
2314 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2315
2316 im = im->next;
2317 while (!im) {
2318 if (likely(state->idev != NULL)) {
2319 read_unlock_bh(&state->idev->lock);
2320 in6_dev_put(state->idev);
2321 }
2322 state->dev = state->dev->next;
2323 if (!state->dev) {
2324 state->idev = NULL;
2325 break;
2326 }
2327 state->idev = in6_dev_get(state->dev);
2328 if (!state->idev)
2329 continue;
2330 read_lock_bh(&state->idev->lock);
2331 im = state->idev->mc_list;
2332 }
2333 return im;
2334 }
2335
2336 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2337 {
2338 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2339 if (im)
2340 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2341 --pos;
2342 return pos ? NULL : im;
2343 }
2344
2345 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2346 {
2347 read_lock(&dev_base_lock);
2348 return igmp6_mc_get_idx(seq, *pos);
2349 }
2350
2351 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2352 {
2353 struct ifmcaddr6 *im;
2354 im = igmp6_mc_get_next(seq, v);
2355 ++*pos;
2356 return im;
2357 }
2358
2359 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2360 {
2361 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2362 if (likely(state->idev != NULL)) {
2363 read_unlock_bh(&state->idev->lock);
2364 in6_dev_put(state->idev);
2365 state->idev = NULL;
2366 }
2367 state->dev = NULL;
2368 read_unlock(&dev_base_lock);
2369 }
2370
2371 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2372 {
2373 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2374 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2375
2376 seq_printf(seq,
2377 "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n",
2378 state->dev->ifindex, state->dev->name,
2379 NIP6(im->mca_addr),
2380 im->mca_users, im->mca_flags,
2381 (im->mca_flags&MAF_TIMER_RUNNING) ?
2382 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2383 return 0;
2384 }
2385
2386 static struct seq_operations igmp6_mc_seq_ops = {
2387 .start = igmp6_mc_seq_start,
2388 .next = igmp6_mc_seq_next,
2389 .stop = igmp6_mc_seq_stop,
2390 .show = igmp6_mc_seq_show,
2391 };
2392
2393 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2394 {
2395 struct seq_file *seq;
2396 int rc = -ENOMEM;
2397 struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2398
2399 if (!s)
2400 goto out;
2401
2402 rc = seq_open(file, &igmp6_mc_seq_ops);
2403 if (rc)
2404 goto out_kfree;
2405
2406 seq = file->private_data;
2407 seq->private = s;
2408 memset(s, 0, sizeof(*s));
2409 out:
2410 return rc;
2411 out_kfree:
2412 kfree(s);
2413 goto out;
2414 }
2415
2416 static struct file_operations igmp6_mc_seq_fops = {
2417 .owner = THIS_MODULE,
2418 .open = igmp6_mc_seq_open,
2419 .read = seq_read,
2420 .llseek = seq_lseek,
2421 .release = seq_release_private,
2422 };
2423
2424 struct igmp6_mcf_iter_state {
2425 struct net_device *dev;
2426 struct inet6_dev *idev;
2427 struct ifmcaddr6 *im;
2428 };
2429
2430 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2431
2432 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2433 {
2434 struct ip6_sf_list *psf = NULL;
2435 struct ifmcaddr6 *im = NULL;
2436 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2437
2438 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2439 state->dev;
2440 state->dev = state->dev->next) {
2441 struct inet6_dev *idev;
2442 idev = in6_dev_get(state->dev);
2443 if (unlikely(idev == NULL))
2444 continue;
2445 read_lock_bh(&idev->lock);
2446 im = idev->mc_list;
2447 if (likely(im != NULL)) {
2448 spin_lock_bh(&im->mca_lock);
2449 psf = im->mca_sources;
2450 if (likely(psf != NULL)) {
2451 state->im = im;
2452 state->idev = idev;
2453 break;
2454 }
2455 spin_unlock_bh(&im->mca_lock);
2456 }
2457 read_unlock_bh(&idev->lock);
2458 in6_dev_put(idev);
2459 }
2460 return psf;
2461 }
2462
2463 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2464 {
2465 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2466
2467 psf = psf->sf_next;
2468 while (!psf) {
2469 spin_unlock_bh(&state->im->mca_lock);
2470 state->im = state->im->next;
2471 while (!state->im) {
2472 if (likely(state->idev != NULL)) {
2473 read_unlock_bh(&state->idev->lock);
2474 in6_dev_put(state->idev);
2475 }
2476 state->dev = state->dev->next;
2477 if (!state->dev) {
2478 state->idev = NULL;
2479 goto out;
2480 }
2481 state->idev = in6_dev_get(state->dev);
2482 if (!state->idev)
2483 continue;
2484 read_lock_bh(&state->idev->lock);
2485 state->im = state->idev->mc_list;
2486 }
2487 if (!state->im)
2488 break;
2489 spin_lock_bh(&state->im->mca_lock);
2490 psf = state->im->mca_sources;
2491 }
2492 out:
2493 return psf;
2494 }
2495
2496 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2497 {
2498 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2499 if (psf)
2500 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2501 --pos;
2502 return pos ? NULL : psf;
2503 }
2504
2505 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2506 {
2507 read_lock(&dev_base_lock);
2508 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2509 }
2510
2511 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2512 {
2513 struct ip6_sf_list *psf;
2514 if (v == SEQ_START_TOKEN)
2515 psf = igmp6_mcf_get_first(seq);
2516 else
2517 psf = igmp6_mcf_get_next(seq, v);
2518 ++*pos;
2519 return psf;
2520 }
2521
2522 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2523 {
2524 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2525 if (likely(state->im != NULL)) {
2526 spin_unlock_bh(&state->im->mca_lock);
2527 state->im = NULL;
2528 }
2529 if (likely(state->idev != NULL)) {
2530 read_unlock_bh(&state->idev->lock);
2531 in6_dev_put(state->idev);
2532 state->idev = NULL;
2533 }
2534 state->dev = NULL;
2535 read_unlock(&dev_base_lock);
2536 }
2537
2538 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2539 {
2540 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2541 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2542
2543 if (v == SEQ_START_TOKEN) {
2544 seq_printf(seq,
2545 "%3s %6s "
2546 "%32s %32s %6s %6s\n", "Idx",
2547 "Device", "Multicast Address",
2548 "Source Address", "INC", "EXC");
2549 } else {
2550 seq_printf(seq,
2551 "%3d %6.6s "
2552 "%04x%04x%04x%04x%04x%04x%04x%04x "
2553 "%04x%04x%04x%04x%04x%04x%04x%04x "
2554 "%6lu %6lu\n",
2555 state->dev->ifindex, state->dev->name,
2556 NIP6(state->im->mca_addr),
2557 NIP6(psf->sf_addr),
2558 psf->sf_count[MCAST_INCLUDE],
2559 psf->sf_count[MCAST_EXCLUDE]);
2560 }
2561 return 0;
2562 }
2563
2564 static struct seq_operations igmp6_mcf_seq_ops = {
2565 .start = igmp6_mcf_seq_start,
2566 .next = igmp6_mcf_seq_next,
2567 .stop = igmp6_mcf_seq_stop,
2568 .show = igmp6_mcf_seq_show,
2569 };
2570
2571 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2572 {
2573 struct seq_file *seq;
2574 int rc = -ENOMEM;
2575 struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2576
2577 if (!s)
2578 goto out;
2579
2580 rc = seq_open(file, &igmp6_mcf_seq_ops);
2581 if (rc)
2582 goto out_kfree;
2583
2584 seq = file->private_data;
2585 seq->private = s;
2586 memset(s, 0, sizeof(*s));
2587 out:
2588 return rc;
2589 out_kfree:
2590 kfree(s);
2591 goto out;
2592 }
2593
2594 static struct file_operations igmp6_mcf_seq_fops = {
2595 .owner = THIS_MODULE,
2596 .open = igmp6_mcf_seq_open,
2597 .read = seq_read,
2598 .llseek = seq_lseek,
2599 .release = seq_release_private,
2600 };
2601 #endif
2602
2603 int __init igmp6_init(struct net_proto_family *ops)
2604 {
2605 struct ipv6_pinfo *np;
2606 struct sock *sk;
2607 int err;
2608
2609 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2610 if (err < 0) {
2611 printk(KERN_ERR
2612 "Failed to initialize the IGMP6 control socket (err %d).\n",
2613 err);
2614 igmp6_socket = NULL; /* For safety. */
2615 return err;
2616 }
2617
2618 sk = igmp6_socket->sk;
2619 sk->sk_allocation = GFP_ATOMIC;
2620 sk->sk_prot->unhash(sk);
2621
2622 np = inet6_sk(sk);
2623 np->hop_limit = 1;
2624
2625 #ifdef CONFIG_PROC_FS
2626 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2627 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2628 #endif
2629
2630 return 0;
2631 }
2632
2633 void igmp6_cleanup(void)
2634 {
2635 sock_release(igmp6_socket);
2636 igmp6_socket = NULL; /* for safety */
2637
2638 #ifdef CONFIG_PROC_FS
2639 proc_net_remove("mcfilter6");
2640 proc_net_remove("igmp6");
2641 #endif
2642 }
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