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[IPV6]: Increase default MLD_MAX_MSF to 64.
[deliverable/linux.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 mc_lst->sflist = NULL;
228
229 /*
230 * now add/increase the group membership on the device
231 */
232
233 err = ipv6_dev_mc_inc(dev, addr);
234
235 if (err) {
236 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
237 dev_put(dev);
238 return err;
239 }
240
241 write_lock_bh(&ipv6_sk_mc_lock);
242 mc_lst->next = np->ipv6_mc_list;
243 np->ipv6_mc_list = mc_lst;
244 write_unlock_bh(&ipv6_sk_mc_lock);
245
246 dev_put(dev);
247
248 return 0;
249 }
250
251 /*
252 * socket leave on multicast group
253 */
254 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
255 {
256 struct ipv6_pinfo *np = inet6_sk(sk);
257 struct ipv6_mc_socklist *mc_lst, **lnk;
258
259 write_lock_bh(&ipv6_sk_mc_lock);
260 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
261 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
262 ipv6_addr_equal(&mc_lst->addr, addr)) {
263 struct net_device *dev;
264
265 *lnk = mc_lst->next;
266 write_unlock_bh(&ipv6_sk_mc_lock);
267
268 if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
269 struct inet6_dev *idev = in6_dev_get(dev);
270
271 if (idev) {
272 (void) ip6_mc_leave_src(sk,mc_lst,idev);
273 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
274 in6_dev_put(idev);
275 }
276 dev_put(dev);
277 }
278 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
279 return 0;
280 }
281 }
282 write_unlock_bh(&ipv6_sk_mc_lock);
283
284 return -EADDRNOTAVAIL;
285 }
286
287 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
288 {
289 struct net_device *dev = NULL;
290 struct inet6_dev *idev = NULL;
291
292 if (ifindex == 0) {
293 struct rt6_info *rt;
294
295 rt = rt6_lookup(group, NULL, 0, 0);
296 if (rt) {
297 dev = rt->rt6i_dev;
298 dev_hold(dev);
299 dst_release(&rt->u.dst);
300 }
301 } else
302 dev = dev_get_by_index(ifindex);
303
304 if (!dev)
305 return NULL;
306 idev = in6_dev_get(dev);
307 if (!idev) {
308 dev_put(dev);
309 return NULL;
310 }
311 read_lock_bh(&idev->lock);
312 if (idev->dead) {
313 read_unlock_bh(&idev->lock);
314 in6_dev_put(idev);
315 dev_put(dev);
316 return NULL;
317 }
318 return idev;
319 }
320
321 void ipv6_sock_mc_close(struct sock *sk)
322 {
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct ipv6_mc_socklist *mc_lst;
325
326 write_lock_bh(&ipv6_sk_mc_lock);
327 while ((mc_lst = np->ipv6_mc_list) != NULL) {
328 struct net_device *dev;
329
330 np->ipv6_mc_list = mc_lst->next;
331 write_unlock_bh(&ipv6_sk_mc_lock);
332
333 dev = dev_get_by_index(mc_lst->ifindex);
334 if (dev) {
335 struct inet6_dev *idev = in6_dev_get(dev);
336
337 if (idev) {
338 (void) ip6_mc_leave_src(sk, mc_lst, idev);
339 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
340 in6_dev_put(idev);
341 }
342 dev_put(dev);
343 }
344
345 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
346
347 write_lock_bh(&ipv6_sk_mc_lock);
348 }
349 write_unlock_bh(&ipv6_sk_mc_lock);
350 }
351
352 int ip6_mc_source(int add, int omode, struct sock *sk,
353 struct group_source_req *pgsr)
354 {
355 struct in6_addr *source, *group;
356 struct ipv6_mc_socklist *pmc;
357 struct net_device *dev;
358 struct inet6_dev *idev;
359 struct ipv6_pinfo *inet6 = inet6_sk(sk);
360 struct ip6_sf_socklist *psl;
361 int i, j, rv;
362 int leavegroup = 0;
363 int err;
364
365 if (pgsr->gsr_group.ss_family != AF_INET6 ||
366 pgsr->gsr_source.ss_family != AF_INET6)
367 return -EINVAL;
368
369 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
370 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
371
372 if (!ipv6_addr_is_multicast(group))
373 return -EINVAL;
374
375 idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
376 if (!idev)
377 return -ENODEV;
378 dev = idev->dev;
379
380 err = -EADDRNOTAVAIL;
381
382 read_lock_bh(&ipv6_sk_mc_lock);
383 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
384 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
385 continue;
386 if (ipv6_addr_equal(&pmc->addr, group))
387 break;
388 }
389 if (!pmc) { /* must have a prior join */
390 err = -EINVAL;
391 goto done;
392 }
393 /* if a source filter was set, must be the same mode as before */
394 if (pmc->sflist) {
395 if (pmc->sfmode != omode) {
396 err = -EINVAL;
397 goto done;
398 }
399 } else if (pmc->sfmode != omode) {
400 /* allow mode switches for empty-set filters */
401 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
402 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
403 pmc->sfmode = omode;
404 }
405
406 psl = pmc->sflist;
407 if (!add) {
408 if (!psl)
409 goto done; /* err = -EADDRNOTAVAIL */
410 rv = !0;
411 for (i=0; i<psl->sl_count; i++) {
412 rv = memcmp(&psl->sl_addr[i], source,
413 sizeof(struct in6_addr));
414 if (rv == 0)
415 break;
416 }
417 if (rv) /* source not found */
418 goto done; /* err = -EADDRNOTAVAIL */
419
420 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
421 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
422 leavegroup = 1;
423 goto done;
424 }
425
426 /* update the interface filter */
427 ip6_mc_del_src(idev, group, omode, 1, source, 1);
428
429 for (j=i+1; j<psl->sl_count; j++)
430 psl->sl_addr[j-1] = psl->sl_addr[j];
431 psl->sl_count--;
432 err = 0;
433 goto done;
434 }
435 /* else, add a new source to the filter */
436
437 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
438 err = -ENOBUFS;
439 goto done;
440 }
441 if (!psl || psl->sl_count == psl->sl_max) {
442 struct ip6_sf_socklist *newpsl;
443 int count = IP6_SFBLOCK;
444
445 if (psl)
446 count += psl->sl_max;
447 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
448 IP6_SFLSIZE(count), GFP_ATOMIC);
449 if (!newpsl) {
450 err = -ENOBUFS;
451 goto done;
452 }
453 newpsl->sl_max = count;
454 newpsl->sl_count = count - IP6_SFBLOCK;
455 if (psl) {
456 for (i=0; i<psl->sl_count; i++)
457 newpsl->sl_addr[i] = psl->sl_addr[i];
458 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
459 }
460 pmc->sflist = psl = newpsl;
461 }
462 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
463 for (i=0; i<psl->sl_count; i++) {
464 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
465 if (rv == 0)
466 break;
467 }
468 if (rv == 0) /* address already there is an error */
469 goto done;
470 for (j=psl->sl_count-1; j>=i; j--)
471 psl->sl_addr[j+1] = psl->sl_addr[j];
472 psl->sl_addr[i] = *source;
473 psl->sl_count++;
474 err = 0;
475 /* update the interface list */
476 ip6_mc_add_src(idev, group, omode, 1, source, 1);
477 done:
478 read_unlock_bh(&ipv6_sk_mc_lock);
479 read_unlock_bh(&idev->lock);
480 in6_dev_put(idev);
481 dev_put(dev);
482 if (leavegroup)
483 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
484 return err;
485 }
486
487 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
488 {
489 struct in6_addr *group;
490 struct ipv6_mc_socklist *pmc;
491 struct net_device *dev;
492 struct inet6_dev *idev;
493 struct ipv6_pinfo *inet6 = inet6_sk(sk);
494 struct ip6_sf_socklist *newpsl, *psl;
495 int leavegroup = 0;
496 int i, err;
497
498 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
499
500 if (!ipv6_addr_is_multicast(group))
501 return -EINVAL;
502 if (gsf->gf_fmode != MCAST_INCLUDE &&
503 gsf->gf_fmode != MCAST_EXCLUDE)
504 return -EINVAL;
505
506 idev = ip6_mc_find_dev(group, gsf->gf_interface);
507
508 if (!idev)
509 return -ENODEV;
510 dev = idev->dev;
511
512 err = 0;
513 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
514 leavegroup = 1;
515 goto done;
516 }
517
518 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
519 if (pmc->ifindex != gsf->gf_interface)
520 continue;
521 if (ipv6_addr_equal(&pmc->addr, group))
522 break;
523 }
524 if (!pmc) { /* must have a prior join */
525 err = -EINVAL;
526 goto done;
527 }
528 if (gsf->gf_numsrc) {
529 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
530 IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
531 if (!newpsl) {
532 err = -ENOBUFS;
533 goto done;
534 }
535 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
536 for (i=0; i<newpsl->sl_count; ++i) {
537 struct sockaddr_in6 *psin6;
538
539 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
540 newpsl->sl_addr[i] = psin6->sin6_addr;
541 }
542 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
543 newpsl->sl_count, newpsl->sl_addr, 0);
544 if (err) {
545 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
546 goto done;
547 }
548 } else {
549 newpsl = NULL;
550 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
551 }
552 psl = pmc->sflist;
553 if (psl) {
554 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
555 psl->sl_count, psl->sl_addr, 0);
556 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
557 } else
558 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
559 pmc->sflist = newpsl;
560 pmc->sfmode = gsf->gf_fmode;
561 err = 0;
562 done:
563 read_unlock_bh(&idev->lock);
564 in6_dev_put(idev);
565 dev_put(dev);
566 if (leavegroup)
567 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
568 return err;
569 }
570
571 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
572 struct group_filter __user *optval, int __user *optlen)
573 {
574 int err, i, count, copycount;
575 struct in6_addr *group;
576 struct ipv6_mc_socklist *pmc;
577 struct inet6_dev *idev;
578 struct net_device *dev;
579 struct ipv6_pinfo *inet6 = inet6_sk(sk);
580 struct ip6_sf_socklist *psl;
581
582 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
583
584 if (!ipv6_addr_is_multicast(group))
585 return -EINVAL;
586
587 idev = ip6_mc_find_dev(group, gsf->gf_interface);
588
589 if (!idev)
590 return -ENODEV;
591
592 dev = idev->dev;
593
594 err = -EADDRNOTAVAIL;
595
596 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
597 if (pmc->ifindex != gsf->gf_interface)
598 continue;
599 if (ipv6_addr_equal(group, &pmc->addr))
600 break;
601 }
602 if (!pmc) /* must have a prior join */
603 goto done;
604 gsf->gf_fmode = pmc->sfmode;
605 psl = pmc->sflist;
606 count = psl ? psl->sl_count : 0;
607 read_unlock_bh(&idev->lock);
608 in6_dev_put(idev);
609 dev_put(dev);
610
611 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
612 gsf->gf_numsrc = count;
613 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
614 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
615 return -EFAULT;
616 }
617 for (i=0; i<copycount; i++) {
618 struct sockaddr_in6 *psin6;
619 struct sockaddr_storage ss;
620
621 psin6 = (struct sockaddr_in6 *)&ss;
622 memset(&ss, 0, sizeof(ss));
623 psin6->sin6_family = AF_INET6;
624 psin6->sin6_addr = psl->sl_addr[i];
625 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
626 return -EFAULT;
627 }
628 return 0;
629 done:
630 read_unlock_bh(&idev->lock);
631 in6_dev_put(idev);
632 dev_put(dev);
633 return err;
634 }
635
636 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
637 struct in6_addr *src_addr)
638 {
639 struct ipv6_pinfo *np = inet6_sk(sk);
640 struct ipv6_mc_socklist *mc;
641 struct ip6_sf_socklist *psl;
642 int rv = 1;
643
644 read_lock(&ipv6_sk_mc_lock);
645 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
646 if (ipv6_addr_equal(&mc->addr, mc_addr))
647 break;
648 }
649 if (!mc) {
650 read_unlock(&ipv6_sk_mc_lock);
651 return 1;
652 }
653 psl = mc->sflist;
654 if (!psl) {
655 rv = mc->sfmode == MCAST_EXCLUDE;
656 } else {
657 int i;
658
659 for (i=0; i<psl->sl_count; i++) {
660 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
661 break;
662 }
663 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
664 rv = 0;
665 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
666 rv = 0;
667 }
668 read_unlock(&ipv6_sk_mc_lock);
669
670 return rv;
671 }
672
673 static void ma_put(struct ifmcaddr6 *mc)
674 {
675 if (atomic_dec_and_test(&mc->mca_refcnt)) {
676 in6_dev_put(mc->idev);
677 kfree(mc);
678 }
679 }
680
681 static void igmp6_group_added(struct ifmcaddr6 *mc)
682 {
683 struct net_device *dev = mc->idev->dev;
684 char buf[MAX_ADDR_LEN];
685
686 spin_lock_bh(&mc->mca_lock);
687 if (!(mc->mca_flags&MAF_LOADED)) {
688 mc->mca_flags |= MAF_LOADED;
689 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
690 dev_mc_add(dev, buf, dev->addr_len, 0);
691 }
692 spin_unlock_bh(&mc->mca_lock);
693
694 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
695 return;
696
697 if (MLD_V1_SEEN(mc->idev)) {
698 igmp6_join_group(mc);
699 return;
700 }
701 /* else v2 */
702
703 mc->mca_crcount = mc->idev->mc_qrv;
704 mld_ifc_event(mc->idev);
705 }
706
707 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
708 {
709 struct net_device *dev = mc->idev->dev;
710 char buf[MAX_ADDR_LEN];
711
712 spin_lock_bh(&mc->mca_lock);
713 if (mc->mca_flags&MAF_LOADED) {
714 mc->mca_flags &= ~MAF_LOADED;
715 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
716 dev_mc_delete(dev, buf, dev->addr_len, 0);
717 }
718
719 if (mc->mca_flags & MAF_NOREPORT)
720 goto done;
721 spin_unlock_bh(&mc->mca_lock);
722
723 if (!mc->idev->dead)
724 igmp6_leave_group(mc);
725
726 spin_lock_bh(&mc->mca_lock);
727 if (del_timer(&mc->mca_timer))
728 atomic_dec(&mc->mca_refcnt);
729 done:
730 ip6_mc_clear_src(mc);
731 spin_unlock_bh(&mc->mca_lock);
732 }
733
734 /*
735 * deleted ifmcaddr6 manipulation
736 */
737 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
738 {
739 struct ifmcaddr6 *pmc;
740
741 /* this is an "ifmcaddr6" for convenience; only the fields below
742 * are actually used. In particular, the refcnt and users are not
743 * used for management of the delete list. Using the same structure
744 * for deleted items allows change reports to use common code with
745 * non-deleted or query-response MCA's.
746 */
747 pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
748 if (!pmc)
749 return;
750 memset(pmc, 0, sizeof(*pmc));
751 spin_lock_bh(&im->mca_lock);
752 spin_lock_init(&pmc->mca_lock);
753 pmc->idev = im->idev;
754 in6_dev_hold(idev);
755 pmc->mca_addr = im->mca_addr;
756 pmc->mca_crcount = idev->mc_qrv;
757 pmc->mca_sfmode = im->mca_sfmode;
758 if (pmc->mca_sfmode == MCAST_INCLUDE) {
759 struct ip6_sf_list *psf;
760
761 pmc->mca_tomb = im->mca_tomb;
762 pmc->mca_sources = im->mca_sources;
763 im->mca_tomb = im->mca_sources = NULL;
764 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
765 psf->sf_crcount = pmc->mca_crcount;
766 }
767 spin_unlock_bh(&im->mca_lock);
768
769 write_lock_bh(&idev->mc_lock);
770 pmc->next = idev->mc_tomb;
771 idev->mc_tomb = pmc;
772 write_unlock_bh(&idev->mc_lock);
773 }
774
775 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
776 {
777 struct ifmcaddr6 *pmc, *pmc_prev;
778 struct ip6_sf_list *psf, *psf_next;
779
780 write_lock_bh(&idev->mc_lock);
781 pmc_prev = NULL;
782 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
783 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
784 break;
785 pmc_prev = pmc;
786 }
787 if (pmc) {
788 if (pmc_prev)
789 pmc_prev->next = pmc->next;
790 else
791 idev->mc_tomb = pmc->next;
792 }
793 write_unlock_bh(&idev->mc_lock);
794 if (pmc) {
795 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
796 psf_next = psf->sf_next;
797 kfree(psf);
798 }
799 in6_dev_put(pmc->idev);
800 kfree(pmc);
801 }
802 }
803
804 static void mld_clear_delrec(struct inet6_dev *idev)
805 {
806 struct ifmcaddr6 *pmc, *nextpmc;
807
808 write_lock_bh(&idev->mc_lock);
809 pmc = idev->mc_tomb;
810 idev->mc_tomb = NULL;
811 write_unlock_bh(&idev->mc_lock);
812
813 for (; pmc; pmc = nextpmc) {
814 nextpmc = pmc->next;
815 ip6_mc_clear_src(pmc);
816 in6_dev_put(pmc->idev);
817 kfree(pmc);
818 }
819
820 /* clear dead sources, too */
821 read_lock_bh(&idev->lock);
822 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
823 struct ip6_sf_list *psf, *psf_next;
824
825 spin_lock_bh(&pmc->mca_lock);
826 psf = pmc->mca_tomb;
827 pmc->mca_tomb = NULL;
828 spin_unlock_bh(&pmc->mca_lock);
829 for (; psf; psf=psf_next) {
830 psf_next = psf->sf_next;
831 kfree(psf);
832 }
833 }
834 read_unlock_bh(&idev->lock);
835 }
836
837
838 /*
839 * device multicast group inc (add if not found)
840 */
841 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
842 {
843 struct ifmcaddr6 *mc;
844 struct inet6_dev *idev;
845
846 idev = in6_dev_get(dev);
847
848 if (idev == NULL)
849 return -EINVAL;
850
851 write_lock_bh(&idev->lock);
852 if (idev->dead) {
853 write_unlock_bh(&idev->lock);
854 in6_dev_put(idev);
855 return -ENODEV;
856 }
857
858 for (mc = idev->mc_list; mc; mc = mc->next) {
859 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
860 mc->mca_users++;
861 write_unlock_bh(&idev->lock);
862 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
863 NULL, 0);
864 in6_dev_put(idev);
865 return 0;
866 }
867 }
868
869 /*
870 * not found: create a new one.
871 */
872
873 mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
874
875 if (mc == NULL) {
876 write_unlock_bh(&idev->lock);
877 in6_dev_put(idev);
878 return -ENOMEM;
879 }
880
881 memset(mc, 0, sizeof(struct ifmcaddr6));
882 init_timer(&mc->mca_timer);
883 mc->mca_timer.function = igmp6_timer_handler;
884 mc->mca_timer.data = (unsigned long) mc;
885
886 ipv6_addr_copy(&mc->mca_addr, addr);
887 mc->idev = idev;
888 mc->mca_users = 1;
889 /* mca_stamp should be updated upon changes */
890 mc->mca_cstamp = mc->mca_tstamp = jiffies;
891 atomic_set(&mc->mca_refcnt, 2);
892 spin_lock_init(&mc->mca_lock);
893
894 /* initial mode is (EX, empty) */
895 mc->mca_sfmode = MCAST_EXCLUDE;
896 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
897
898 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
899 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
900 mc->mca_flags |= MAF_NOREPORT;
901
902 mc->next = idev->mc_list;
903 idev->mc_list = mc;
904 write_unlock_bh(&idev->lock);
905
906 mld_del_delrec(idev, &mc->mca_addr);
907 igmp6_group_added(mc);
908 ma_put(mc);
909 return 0;
910 }
911
912 /*
913 * device multicast group del
914 */
915 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
916 {
917 struct ifmcaddr6 *ma, **map;
918
919 write_lock_bh(&idev->lock);
920 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
921 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
922 if (--ma->mca_users == 0) {
923 *map = ma->next;
924 write_unlock_bh(&idev->lock);
925
926 igmp6_group_dropped(ma);
927
928 ma_put(ma);
929 return 0;
930 }
931 write_unlock_bh(&idev->lock);
932 return 0;
933 }
934 }
935 write_unlock_bh(&idev->lock);
936
937 return -ENOENT;
938 }
939
940 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
941 {
942 struct inet6_dev *idev = in6_dev_get(dev);
943 int err;
944
945 if (!idev)
946 return -ENODEV;
947
948 err = __ipv6_dev_mc_dec(idev, addr);
949
950 in6_dev_put(idev);
951
952 return err;
953 }
954
955 /*
956 * identify MLD packets for MLD filter exceptions
957 */
958 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
959 {
960 struct icmp6hdr *pic;
961
962 if (nexthdr != IPPROTO_ICMPV6)
963 return 0;
964
965 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
966 return 0;
967
968 pic = (struct icmp6hdr *)skb->h.raw;
969
970 switch (pic->icmp6_type) {
971 case ICMPV6_MGM_QUERY:
972 case ICMPV6_MGM_REPORT:
973 case ICMPV6_MGM_REDUCTION:
974 case ICMPV6_MLD2_REPORT:
975 return 1;
976 default:
977 break;
978 }
979 return 0;
980 }
981
982 /*
983 * check if the interface/address pair is valid
984 */
985 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
986 struct in6_addr *src_addr)
987 {
988 struct inet6_dev *idev;
989 struct ifmcaddr6 *mc;
990 int rv = 0;
991
992 idev = in6_dev_get(dev);
993 if (idev) {
994 read_lock_bh(&idev->lock);
995 for (mc = idev->mc_list; mc; mc=mc->next) {
996 if (ipv6_addr_equal(&mc->mca_addr, group))
997 break;
998 }
999 if (mc) {
1000 if (src_addr && !ipv6_addr_any(src_addr)) {
1001 struct ip6_sf_list *psf;
1002
1003 spin_lock_bh(&mc->mca_lock);
1004 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1005 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1006 break;
1007 }
1008 if (psf)
1009 rv = psf->sf_count[MCAST_INCLUDE] ||
1010 psf->sf_count[MCAST_EXCLUDE] !=
1011 mc->mca_sfcount[MCAST_EXCLUDE];
1012 else
1013 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1014 spin_unlock_bh(&mc->mca_lock);
1015 } else
1016 rv = 1; /* don't filter unspecified source */
1017 }
1018 read_unlock_bh(&idev->lock);
1019 in6_dev_put(idev);
1020 }
1021 return rv;
1022 }
1023
1024 static void mld_gq_start_timer(struct inet6_dev *idev)
1025 {
1026 int tv = net_random() % idev->mc_maxdelay;
1027
1028 idev->mc_gq_running = 1;
1029 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1030 in6_dev_hold(idev);
1031 }
1032
1033 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1034 {
1035 int tv = net_random() % delay;
1036
1037 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1038 in6_dev_hold(idev);
1039 }
1040
1041 /*
1042 * IGMP handling (alias multicast ICMPv6 messages)
1043 */
1044
1045 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1046 {
1047 unsigned long delay = resptime;
1048
1049 /* Do not start timer for these addresses */
1050 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1051 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1052 return;
1053
1054 if (del_timer(&ma->mca_timer)) {
1055 atomic_dec(&ma->mca_refcnt);
1056 delay = ma->mca_timer.expires - jiffies;
1057 }
1058
1059 if (delay >= resptime) {
1060 if (resptime)
1061 delay = net_random() % resptime;
1062 else
1063 delay = 1;
1064 }
1065 ma->mca_timer.expires = jiffies + delay;
1066 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1067 atomic_inc(&ma->mca_refcnt);
1068 ma->mca_flags |= MAF_TIMER_RUNNING;
1069 }
1070
1071 static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1072 struct in6_addr *srcs)
1073 {
1074 struct ip6_sf_list *psf;
1075 int i, scount;
1076
1077 scount = 0;
1078 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1079 if (scount == nsrcs)
1080 break;
1081 for (i=0; i<nsrcs; i++)
1082 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1083 psf->sf_gsresp = 1;
1084 scount++;
1085 break;
1086 }
1087 }
1088 }
1089
1090 int igmp6_event_query(struct sk_buff *skb)
1091 {
1092 struct mld2_query *mlh2 = NULL;
1093 struct ifmcaddr6 *ma;
1094 struct in6_addr *group;
1095 unsigned long max_delay;
1096 struct inet6_dev *idev;
1097 struct icmp6hdr *hdr;
1098 int group_type;
1099 int mark = 0;
1100 int len;
1101
1102 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1103 return -EINVAL;
1104
1105 /* compute payload length excluding extension headers */
1106 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1107 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1108
1109 /* Drop queries with not link local source */
1110 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1111 return -EINVAL;
1112
1113 idev = in6_dev_get(skb->dev);
1114
1115 if (idev == NULL)
1116 return 0;
1117
1118 hdr = (struct icmp6hdr *) skb->h.raw;
1119 group = (struct in6_addr *) (hdr + 1);
1120 group_type = ipv6_addr_type(group);
1121
1122 if (group_type != IPV6_ADDR_ANY &&
1123 !(group_type&IPV6_ADDR_MULTICAST)) {
1124 in6_dev_put(idev);
1125 return -EINVAL;
1126 }
1127
1128 if (len == 24) {
1129 int switchback;
1130 /* MLDv1 router present */
1131
1132 /* Translate milliseconds to jiffies */
1133 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1134
1135 switchback = (idev->mc_qrv + 1) * max_delay;
1136 idev->mc_v1_seen = jiffies + switchback;
1137
1138 /* cancel the interface change timer */
1139 idev->mc_ifc_count = 0;
1140 if (del_timer(&idev->mc_ifc_timer))
1141 __in6_dev_put(idev);
1142 /* clear deleted report items */
1143 mld_clear_delrec(idev);
1144 } else if (len >= 28) {
1145 int srcs_offset = sizeof(struct mld2_query) -
1146 sizeof(struct icmp6hdr);
1147 if (!pskb_may_pull(skb, srcs_offset)) {
1148 in6_dev_put(idev);
1149 return -EINVAL;
1150 }
1151 mlh2 = (struct mld2_query *) skb->h.raw;
1152 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1153 if (!max_delay)
1154 max_delay = 1;
1155 idev->mc_maxdelay = max_delay;
1156 if (mlh2->qrv)
1157 idev->mc_qrv = mlh2->qrv;
1158 if (group_type == IPV6_ADDR_ANY) { /* general query */
1159 if (mlh2->nsrcs) {
1160 in6_dev_put(idev);
1161 return -EINVAL; /* no sources allowed */
1162 }
1163 mld_gq_start_timer(idev);
1164 in6_dev_put(idev);
1165 return 0;
1166 }
1167 /* mark sources to include, if group & source-specific */
1168 if (mlh2->nsrcs != 0) {
1169 if (!pskb_may_pull(skb, srcs_offset +
1170 mlh2->nsrcs * sizeof(struct in6_addr))) {
1171 in6_dev_put(idev);
1172 return -EINVAL;
1173 }
1174 mlh2 = (struct mld2_query *) skb->h.raw;
1175 mark = 1;
1176 }
1177 } else {
1178 in6_dev_put(idev);
1179 return -EINVAL;
1180 }
1181
1182 read_lock_bh(&idev->lock);
1183 if (group_type == IPV6_ADDR_ANY) {
1184 for (ma = idev->mc_list; ma; ma=ma->next) {
1185 spin_lock_bh(&ma->mca_lock);
1186 igmp6_group_queried(ma, max_delay);
1187 spin_unlock_bh(&ma->mca_lock);
1188 }
1189 } else {
1190 for (ma = idev->mc_list; ma; ma=ma->next) {
1191 if (group_type != IPV6_ADDR_ANY &&
1192 !ipv6_addr_equal(group, &ma->mca_addr))
1193 continue;
1194 spin_lock_bh(&ma->mca_lock);
1195 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1196 /* gsquery <- gsquery && mark */
1197 if (!mark)
1198 ma->mca_flags &= ~MAF_GSQUERY;
1199 } else {
1200 /* gsquery <- mark */
1201 if (mark)
1202 ma->mca_flags |= MAF_GSQUERY;
1203 else
1204 ma->mca_flags &= ~MAF_GSQUERY;
1205 }
1206 if (ma->mca_flags & MAF_GSQUERY)
1207 mld_marksources(ma, ntohs(mlh2->nsrcs),
1208 mlh2->srcs);
1209 igmp6_group_queried(ma, max_delay);
1210 spin_unlock_bh(&ma->mca_lock);
1211 if (group_type != IPV6_ADDR_ANY)
1212 break;
1213 }
1214 }
1215 read_unlock_bh(&idev->lock);
1216 in6_dev_put(idev);
1217
1218 return 0;
1219 }
1220
1221
1222 int igmp6_event_report(struct sk_buff *skb)
1223 {
1224 struct ifmcaddr6 *ma;
1225 struct in6_addr *addrp;
1226 struct inet6_dev *idev;
1227 struct icmp6hdr *hdr;
1228 int addr_type;
1229
1230 /* Our own report looped back. Ignore it. */
1231 if (skb->pkt_type == PACKET_LOOPBACK)
1232 return 0;
1233
1234 /* send our report if the MC router may not have heard this report */
1235 if (skb->pkt_type != PACKET_MULTICAST &&
1236 skb->pkt_type != PACKET_BROADCAST)
1237 return 0;
1238
1239 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1240 return -EINVAL;
1241
1242 hdr = (struct icmp6hdr*) skb->h.raw;
1243
1244 /* Drop reports with not link local source */
1245 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1246 if (addr_type != IPV6_ADDR_ANY &&
1247 !(addr_type&IPV6_ADDR_LINKLOCAL))
1248 return -EINVAL;
1249
1250 addrp = (struct in6_addr *) (hdr + 1);
1251
1252 idev = in6_dev_get(skb->dev);
1253 if (idev == NULL)
1254 return -ENODEV;
1255
1256 /*
1257 * Cancel the timer for this group
1258 */
1259
1260 read_lock_bh(&idev->lock);
1261 for (ma = idev->mc_list; ma; ma=ma->next) {
1262 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1263 spin_lock(&ma->mca_lock);
1264 if (del_timer(&ma->mca_timer))
1265 atomic_dec(&ma->mca_refcnt);
1266 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1267 spin_unlock(&ma->mca_lock);
1268 break;
1269 }
1270 }
1271 read_unlock_bh(&idev->lock);
1272 in6_dev_put(idev);
1273 return 0;
1274 }
1275
1276 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1277 int gdeleted, int sdeleted)
1278 {
1279 switch (type) {
1280 case MLD2_MODE_IS_INCLUDE:
1281 case MLD2_MODE_IS_EXCLUDE:
1282 if (gdeleted || sdeleted)
1283 return 0;
1284 return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
1285 case MLD2_CHANGE_TO_INCLUDE:
1286 if (gdeleted || sdeleted)
1287 return 0;
1288 return psf->sf_count[MCAST_INCLUDE] != 0;
1289 case MLD2_CHANGE_TO_EXCLUDE:
1290 if (gdeleted || sdeleted)
1291 return 0;
1292 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1293 psf->sf_count[MCAST_INCLUDE])
1294 return 0;
1295 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1296 psf->sf_count[MCAST_EXCLUDE];
1297 case MLD2_ALLOW_NEW_SOURCES:
1298 if (gdeleted || !psf->sf_crcount)
1299 return 0;
1300 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1301 case MLD2_BLOCK_OLD_SOURCES:
1302 if (pmc->mca_sfmode == MCAST_INCLUDE)
1303 return gdeleted || (psf->sf_crcount && sdeleted);
1304 return psf->sf_crcount && !gdeleted && !sdeleted;
1305 }
1306 return 0;
1307 }
1308
1309 static int
1310 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1311 {
1312 struct ip6_sf_list *psf;
1313 int scount = 0;
1314
1315 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1316 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1317 continue;
1318 scount++;
1319 }
1320 return scount;
1321 }
1322
1323 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1324 {
1325 struct sock *sk = igmp6_socket->sk;
1326 struct sk_buff *skb;
1327 struct mld2_report *pmr;
1328 struct in6_addr addr_buf;
1329 int err;
1330 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1331 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1332 IPV6_TLV_PADN, 0 };
1333
1334 /* we assume size > sizeof(ra) here */
1335 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1336
1337 if (skb == 0)
1338 return NULL;
1339
1340 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1341
1342 if (ipv6_get_lladdr(dev, &addr_buf)) {
1343 /* <draft-ietf-magma-mld-source-05.txt>:
1344 * use unspecified address as the source address
1345 * when a valid link-local address is not available.
1346 */
1347 memset(&addr_buf, 0, sizeof(addr_buf));
1348 }
1349
1350 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1351
1352 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1353
1354 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1355 skb->h.raw = (unsigned char *)pmr;
1356 pmr->type = ICMPV6_MLD2_REPORT;
1357 pmr->resv1 = 0;
1358 pmr->csum = 0;
1359 pmr->resv2 = 0;
1360 pmr->ngrec = 0;
1361 return skb;
1362 }
1363
1364 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1365 {
1366 struct net_device *dev = skb->dev;
1367
1368 if (dev->hard_header) {
1369 unsigned char ha[MAX_ADDR_LEN];
1370 int err;
1371
1372 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1373 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1374 if (err < 0) {
1375 kfree_skb(skb);
1376 return err;
1377 }
1378 }
1379 return dev_queue_xmit(skb);
1380 }
1381
1382 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1383 {
1384 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1385 mld_dev_queue_xmit2);
1386 }
1387
1388 static void mld_sendpack(struct sk_buff *skb)
1389 {
1390 struct ipv6hdr *pip6 = skb->nh.ipv6h;
1391 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1392 int payload_len, mldlen;
1393 struct inet6_dev *idev = in6_dev_get(skb->dev);
1394 int err;
1395
1396 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1397 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1398 sizeof(struct ipv6hdr);
1399 mldlen = skb->tail - skb->h.raw;
1400 pip6->payload_len = htons(payload_len);
1401
1402 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1403 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1404 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1405 mld_dev_queue_xmit);
1406 if (!err) {
1407 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1408 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1409 } else
1410 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1411
1412 if (likely(idev != NULL))
1413 in6_dev_put(idev);
1414 }
1415
1416 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1417 {
1418 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1419 }
1420
1421 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1422 int type, struct mld2_grec **ppgr)
1423 {
1424 struct net_device *dev = pmc->idev->dev;
1425 struct mld2_report *pmr;
1426 struct mld2_grec *pgr;
1427
1428 if (!skb)
1429 skb = mld_newpack(dev, dev->mtu);
1430 if (!skb)
1431 return NULL;
1432 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1433 pgr->grec_type = type;
1434 pgr->grec_auxwords = 0;
1435 pgr->grec_nsrcs = 0;
1436 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1437 pmr = (struct mld2_report *)skb->h.raw;
1438 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1439 *ppgr = pgr;
1440 return skb;
1441 }
1442
1443 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1444 skb_tailroom(skb)) : 0)
1445
1446 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1447 int type, int gdeleted, int sdeleted)
1448 {
1449 struct net_device *dev = pmc->idev->dev;
1450 struct mld2_report *pmr;
1451 struct mld2_grec *pgr = NULL;
1452 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1453 int scount, first, isquery, truncate;
1454
1455 if (pmc->mca_flags & MAF_NOREPORT)
1456 return skb;
1457
1458 isquery = type == MLD2_MODE_IS_INCLUDE ||
1459 type == MLD2_MODE_IS_EXCLUDE;
1460 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1461 type == MLD2_CHANGE_TO_EXCLUDE;
1462
1463 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1464
1465 if (!*psf_list) {
1466 if (type == MLD2_ALLOW_NEW_SOURCES ||
1467 type == MLD2_BLOCK_OLD_SOURCES)
1468 return skb;
1469 if (pmc->mca_crcount || isquery) {
1470 /* make sure we have room for group header and at
1471 * least one source.
1472 */
1473 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
1474 sizeof(struct in6_addr)) {
1475 mld_sendpack(skb);
1476 skb = NULL; /* add_grhead will get a new one */
1477 }
1478 skb = add_grhead(skb, pmc, type, &pgr);
1479 }
1480 return skb;
1481 }
1482 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1483
1484 /* EX and TO_EX get a fresh packet, if needed */
1485 if (truncate) {
1486 if (pmr && pmr->ngrec &&
1487 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1488 if (skb)
1489 mld_sendpack(skb);
1490 skb = mld_newpack(dev, dev->mtu);
1491 }
1492 }
1493 first = 1;
1494 scount = 0;
1495 psf_prev = NULL;
1496 for (psf=*psf_list; psf; psf=psf_next) {
1497 struct in6_addr *psrc;
1498
1499 psf_next = psf->sf_next;
1500
1501 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1502 psf_prev = psf;
1503 continue;
1504 }
1505
1506 /* clear marks on query responses */
1507 if (isquery)
1508 psf->sf_gsresp = 0;
1509
1510 if (AVAILABLE(skb) < sizeof(*psrc) +
1511 first*sizeof(struct mld2_grec)) {
1512 if (truncate && !first)
1513 break; /* truncate these */
1514 if (pgr)
1515 pgr->grec_nsrcs = htons(scount);
1516 if (skb)
1517 mld_sendpack(skb);
1518 skb = mld_newpack(dev, dev->mtu);
1519 first = 1;
1520 scount = 0;
1521 }
1522 if (first) {
1523 skb = add_grhead(skb, pmc, type, &pgr);
1524 first = 0;
1525 }
1526 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1527 *psrc = psf->sf_addr;
1528 scount++;
1529 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1530 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1531 psf->sf_crcount--;
1532 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1533 if (psf_prev)
1534 psf_prev->sf_next = psf->sf_next;
1535 else
1536 *psf_list = psf->sf_next;
1537 kfree(psf);
1538 continue;
1539 }
1540 }
1541 psf_prev = psf;
1542 }
1543 if (pgr)
1544 pgr->grec_nsrcs = htons(scount);
1545
1546 if (isquery)
1547 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1548 return skb;
1549 }
1550
1551 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1552 {
1553 struct sk_buff *skb = NULL;
1554 int type;
1555
1556 if (!pmc) {
1557 read_lock_bh(&idev->lock);
1558 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1559 if (pmc->mca_flags & MAF_NOREPORT)
1560 continue;
1561 spin_lock_bh(&pmc->mca_lock);
1562 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1563 type = MLD2_MODE_IS_EXCLUDE;
1564 else
1565 type = MLD2_MODE_IS_INCLUDE;
1566 skb = add_grec(skb, pmc, type, 0, 0);
1567 spin_unlock_bh(&pmc->mca_lock);
1568 }
1569 read_unlock_bh(&idev->lock);
1570 } else {
1571 spin_lock_bh(&pmc->mca_lock);
1572 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1573 type = MLD2_MODE_IS_EXCLUDE;
1574 else
1575 type = MLD2_MODE_IS_INCLUDE;
1576 skb = add_grec(skb, pmc, type, 0, 0);
1577 spin_unlock_bh(&pmc->mca_lock);
1578 }
1579 if (skb)
1580 mld_sendpack(skb);
1581 }
1582
1583 /*
1584 * remove zero-count source records from a source filter list
1585 */
1586 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1587 {
1588 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1589
1590 psf_prev = NULL;
1591 for (psf=*ppsf; psf; psf = psf_next) {
1592 psf_next = psf->sf_next;
1593 if (psf->sf_crcount == 0) {
1594 if (psf_prev)
1595 psf_prev->sf_next = psf->sf_next;
1596 else
1597 *ppsf = psf->sf_next;
1598 kfree(psf);
1599 } else
1600 psf_prev = psf;
1601 }
1602 }
1603
1604 static void mld_send_cr(struct inet6_dev *idev)
1605 {
1606 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1607 struct sk_buff *skb = NULL;
1608 int type, dtype;
1609
1610 read_lock_bh(&idev->lock);
1611 write_lock_bh(&idev->mc_lock);
1612
1613 /* deleted MCA's */
1614 pmc_prev = NULL;
1615 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1616 pmc_next = pmc->next;
1617 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1618 type = MLD2_BLOCK_OLD_SOURCES;
1619 dtype = MLD2_BLOCK_OLD_SOURCES;
1620 skb = add_grec(skb, pmc, type, 1, 0);
1621 skb = add_grec(skb, pmc, dtype, 1, 1);
1622 }
1623 if (pmc->mca_crcount) {
1624 pmc->mca_crcount--;
1625 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1626 type = MLD2_CHANGE_TO_INCLUDE;
1627 skb = add_grec(skb, pmc, type, 1, 0);
1628 }
1629 if (pmc->mca_crcount == 0) {
1630 mld_clear_zeros(&pmc->mca_tomb);
1631 mld_clear_zeros(&pmc->mca_sources);
1632 }
1633 }
1634 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1635 !pmc->mca_sources) {
1636 if (pmc_prev)
1637 pmc_prev->next = pmc_next;
1638 else
1639 idev->mc_tomb = pmc_next;
1640 in6_dev_put(pmc->idev);
1641 kfree(pmc);
1642 } else
1643 pmc_prev = pmc;
1644 }
1645 write_unlock_bh(&idev->mc_lock);
1646
1647 /* change recs */
1648 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1649 spin_lock_bh(&pmc->mca_lock);
1650 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1651 type = MLD2_BLOCK_OLD_SOURCES;
1652 dtype = MLD2_ALLOW_NEW_SOURCES;
1653 } else {
1654 type = MLD2_ALLOW_NEW_SOURCES;
1655 dtype = MLD2_BLOCK_OLD_SOURCES;
1656 }
1657 skb = add_grec(skb, pmc, type, 0, 0);
1658 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1659
1660 /* filter mode changes */
1661 if (pmc->mca_crcount) {
1662 pmc->mca_crcount--;
1663 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1664 type = MLD2_CHANGE_TO_EXCLUDE;
1665 else
1666 type = MLD2_CHANGE_TO_INCLUDE;
1667 skb = add_grec(skb, pmc, type, 0, 0);
1668 }
1669 spin_unlock_bh(&pmc->mca_lock);
1670 }
1671 read_unlock_bh(&idev->lock);
1672 if (!skb)
1673 return;
1674 (void) mld_sendpack(skb);
1675 }
1676
1677 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1678 {
1679 struct sock *sk = igmp6_socket->sk;
1680 struct inet6_dev *idev;
1681 struct sk_buff *skb;
1682 struct icmp6hdr *hdr;
1683 struct in6_addr *snd_addr;
1684 struct in6_addr *addrp;
1685 struct in6_addr addr_buf;
1686 struct in6_addr all_routers;
1687 int err, len, payload_len, full_len;
1688 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1689 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1690 IPV6_TLV_PADN, 0 };
1691
1692 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1693 snd_addr = addr;
1694 if (type == ICMPV6_MGM_REDUCTION) {
1695 snd_addr = &all_routers;
1696 ipv6_addr_all_routers(&all_routers);
1697 }
1698
1699 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1700 payload_len = len + sizeof(ra);
1701 full_len = sizeof(struct ipv6hdr) + payload_len;
1702
1703 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1704
1705 if (skb == NULL) {
1706 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1707 return;
1708 }
1709
1710 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1711
1712 if (ipv6_get_lladdr(dev, &addr_buf)) {
1713 /* <draft-ietf-magma-mld-source-05.txt>:
1714 * use unspecified address as the source address
1715 * when a valid link-local address is not available.
1716 */
1717 memset(&addr_buf, 0, sizeof(addr_buf));
1718 }
1719
1720 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1721
1722 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1723
1724 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1725 memset(hdr, 0, sizeof(struct icmp6hdr));
1726 hdr->icmp6_type = type;
1727
1728 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1729 ipv6_addr_copy(addrp, addr);
1730
1731 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1732 IPPROTO_ICMPV6,
1733 csum_partial((__u8 *) hdr, len, 0));
1734
1735 idev = in6_dev_get(skb->dev);
1736
1737 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1738 mld_dev_queue_xmit);
1739 if (!err) {
1740 if (type == ICMPV6_MGM_REDUCTION)
1741 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1742 else
1743 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1744 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1745 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1746 } else
1747 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1748
1749 if (likely(idev != NULL))
1750 in6_dev_put(idev);
1751 return;
1752 }
1753
1754 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1755 struct in6_addr *psfsrc)
1756 {
1757 struct ip6_sf_list *psf, *psf_prev;
1758 int rv = 0;
1759
1760 psf_prev = NULL;
1761 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1762 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1763 break;
1764 psf_prev = psf;
1765 }
1766 if (!psf || psf->sf_count[sfmode] == 0) {
1767 /* source filter not found, or count wrong => bug */
1768 return -ESRCH;
1769 }
1770 psf->sf_count[sfmode]--;
1771 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1772 struct inet6_dev *idev = pmc->idev;
1773
1774 /* no more filters for this source */
1775 if (psf_prev)
1776 psf_prev->sf_next = psf->sf_next;
1777 else
1778 pmc->mca_sources = psf->sf_next;
1779 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1780 !MLD_V1_SEEN(idev)) {
1781 psf->sf_crcount = idev->mc_qrv;
1782 psf->sf_next = pmc->mca_tomb;
1783 pmc->mca_tomb = psf;
1784 rv = 1;
1785 } else
1786 kfree(psf);
1787 }
1788 return rv;
1789 }
1790
1791 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1792 int sfmode, int sfcount, struct in6_addr *psfsrc,
1793 int delta)
1794 {
1795 struct ifmcaddr6 *pmc;
1796 int changerec = 0;
1797 int i, err;
1798
1799 if (!idev)
1800 return -ENODEV;
1801 read_lock_bh(&idev->lock);
1802 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1803 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1804 break;
1805 }
1806 if (!pmc) {
1807 /* MCA not found?? bug */
1808 read_unlock_bh(&idev->lock);
1809 return -ESRCH;
1810 }
1811 spin_lock_bh(&pmc->mca_lock);
1812 sf_markstate(pmc);
1813 if (!delta) {
1814 if (!pmc->mca_sfcount[sfmode]) {
1815 spin_unlock_bh(&pmc->mca_lock);
1816 read_unlock_bh(&idev->lock);
1817 return -EINVAL;
1818 }
1819 pmc->mca_sfcount[sfmode]--;
1820 }
1821 err = 0;
1822 for (i=0; i<sfcount; i++) {
1823 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1824
1825 changerec |= rv > 0;
1826 if (!err && rv < 0)
1827 err = rv;
1828 }
1829 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1830 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1831 pmc->mca_sfcount[MCAST_INCLUDE]) {
1832 struct ip6_sf_list *psf;
1833
1834 /* filter mode change */
1835 pmc->mca_sfmode = MCAST_INCLUDE;
1836 pmc->mca_crcount = idev->mc_qrv;
1837 idev->mc_ifc_count = pmc->mca_crcount;
1838 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1839 psf->sf_crcount = 0;
1840 mld_ifc_event(pmc->idev);
1841 } else if (sf_setstate(pmc) || changerec)
1842 mld_ifc_event(pmc->idev);
1843 spin_unlock_bh(&pmc->mca_lock);
1844 read_unlock_bh(&idev->lock);
1845 return err;
1846 }
1847
1848 /*
1849 * Add multicast single-source filter to the interface list
1850 */
1851 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1852 struct in6_addr *psfsrc, int delta)
1853 {
1854 struct ip6_sf_list *psf, *psf_prev;
1855
1856 psf_prev = NULL;
1857 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1858 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1859 break;
1860 psf_prev = psf;
1861 }
1862 if (!psf) {
1863 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1864 if (!psf)
1865 return -ENOBUFS;
1866 memset(psf, 0, sizeof(*psf));
1867 psf->sf_addr = *psfsrc;
1868 if (psf_prev) {
1869 psf_prev->sf_next = psf;
1870 } else
1871 pmc->mca_sources = psf;
1872 }
1873 psf->sf_count[sfmode]++;
1874 return 0;
1875 }
1876
1877 static void sf_markstate(struct ifmcaddr6 *pmc)
1878 {
1879 struct ip6_sf_list *psf;
1880 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1881
1882 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1883 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1884 psf->sf_oldin = mca_xcount ==
1885 psf->sf_count[MCAST_EXCLUDE] &&
1886 !psf->sf_count[MCAST_INCLUDE];
1887 } else
1888 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1889 }
1890
1891 static int sf_setstate(struct ifmcaddr6 *pmc)
1892 {
1893 struct ip6_sf_list *psf;
1894 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1895 int qrv = pmc->idev->mc_qrv;
1896 int new_in, rv;
1897
1898 rv = 0;
1899 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1900 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1901 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1902 !psf->sf_count[MCAST_INCLUDE];
1903 } else
1904 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1905 if (new_in != psf->sf_oldin) {
1906 psf->sf_crcount = qrv;
1907 rv++;
1908 }
1909 }
1910 return rv;
1911 }
1912
1913 /*
1914 * Add multicast source filter list to the interface list
1915 */
1916 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
1917 int sfmode, int sfcount, struct in6_addr *psfsrc,
1918 int delta)
1919 {
1920 struct ifmcaddr6 *pmc;
1921 int isexclude;
1922 int i, err;
1923
1924 if (!idev)
1925 return -ENODEV;
1926 read_lock_bh(&idev->lock);
1927 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1928 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1929 break;
1930 }
1931 if (!pmc) {
1932 /* MCA not found?? bug */
1933 read_unlock_bh(&idev->lock);
1934 return -ESRCH;
1935 }
1936 spin_lock_bh(&pmc->mca_lock);
1937
1938 sf_markstate(pmc);
1939 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
1940 if (!delta)
1941 pmc->mca_sfcount[sfmode]++;
1942 err = 0;
1943 for (i=0; i<sfcount; i++) {
1944 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1945 if (err)
1946 break;
1947 }
1948 if (err) {
1949 int j;
1950
1951 if (!delta)
1952 pmc->mca_sfcount[sfmode]--;
1953 for (j=0; j<i; j++)
1954 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1955 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1956 struct inet6_dev *idev = pmc->idev;
1957 struct ip6_sf_list *psf;
1958
1959 /* filter mode change */
1960 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1961 pmc->mca_sfmode = MCAST_EXCLUDE;
1962 else if (pmc->mca_sfcount[MCAST_INCLUDE])
1963 pmc->mca_sfmode = MCAST_INCLUDE;
1964 /* else no filters; keep old mode for reports */
1965
1966 pmc->mca_crcount = idev->mc_qrv;
1967 idev->mc_ifc_count = pmc->mca_crcount;
1968 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1969 psf->sf_crcount = 0;
1970 mld_ifc_event(idev);
1971 } else if (sf_setstate(pmc))
1972 mld_ifc_event(idev);
1973 spin_unlock_bh(&pmc->mca_lock);
1974 read_unlock_bh(&idev->lock);
1975 return err;
1976 }
1977
1978 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
1979 {
1980 struct ip6_sf_list *psf, *nextpsf;
1981
1982 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
1983 nextpsf = psf->sf_next;
1984 kfree(psf);
1985 }
1986 pmc->mca_tomb = NULL;
1987 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
1988 nextpsf = psf->sf_next;
1989 kfree(psf);
1990 }
1991 pmc->mca_sources = NULL;
1992 pmc->mca_sfmode = MCAST_EXCLUDE;
1993 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1994 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
1995 }
1996
1997
1998 static void igmp6_join_group(struct ifmcaddr6 *ma)
1999 {
2000 unsigned long delay;
2001
2002 if (ma->mca_flags & MAF_NOREPORT)
2003 return;
2004
2005 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2006
2007 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2008
2009 spin_lock_bh(&ma->mca_lock);
2010 if (del_timer(&ma->mca_timer)) {
2011 atomic_dec(&ma->mca_refcnt);
2012 delay = ma->mca_timer.expires - jiffies;
2013 }
2014
2015 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2016 atomic_inc(&ma->mca_refcnt);
2017 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2018 spin_unlock_bh(&ma->mca_lock);
2019 }
2020
2021 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2022 struct inet6_dev *idev)
2023 {
2024 int err;
2025
2026 if (iml->sflist == 0) {
2027 /* any-source empty exclude case */
2028 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2029 }
2030 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2031 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2032 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2033 iml->sflist = NULL;
2034 return err;
2035 }
2036
2037 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2038 {
2039 if (MLD_V1_SEEN(ma->idev)) {
2040 if (ma->mca_flags & MAF_LAST_REPORTER)
2041 igmp6_send(&ma->mca_addr, ma->idev->dev,
2042 ICMPV6_MGM_REDUCTION);
2043 } else {
2044 mld_add_delrec(ma->idev, ma);
2045 mld_ifc_event(ma->idev);
2046 }
2047 }
2048
2049 static void mld_gq_timer_expire(unsigned long data)
2050 {
2051 struct inet6_dev *idev = (struct inet6_dev *)data;
2052
2053 idev->mc_gq_running = 0;
2054 mld_send_report(idev, NULL);
2055 __in6_dev_put(idev);
2056 }
2057
2058 static void mld_ifc_timer_expire(unsigned long data)
2059 {
2060 struct inet6_dev *idev = (struct inet6_dev *)data;
2061
2062 mld_send_cr(idev);
2063 if (idev->mc_ifc_count) {
2064 idev->mc_ifc_count--;
2065 if (idev->mc_ifc_count)
2066 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2067 }
2068 __in6_dev_put(idev);
2069 }
2070
2071 static void mld_ifc_event(struct inet6_dev *idev)
2072 {
2073 if (MLD_V1_SEEN(idev))
2074 return;
2075 idev->mc_ifc_count = idev->mc_qrv;
2076 mld_ifc_start_timer(idev, 1);
2077 }
2078
2079
2080 static void igmp6_timer_handler(unsigned long data)
2081 {
2082 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2083
2084 if (MLD_V1_SEEN(ma->idev))
2085 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2086 else
2087 mld_send_report(ma->idev, ma);
2088
2089 spin_lock(&ma->mca_lock);
2090 ma->mca_flags |= MAF_LAST_REPORTER;
2091 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2092 spin_unlock(&ma->mca_lock);
2093 ma_put(ma);
2094 }
2095
2096 /* Device going down */
2097
2098 void ipv6_mc_down(struct inet6_dev *idev)
2099 {
2100 struct ifmcaddr6 *i;
2101
2102 /* Withdraw multicast list */
2103
2104 read_lock_bh(&idev->lock);
2105 idev->mc_ifc_count = 0;
2106 if (del_timer(&idev->mc_ifc_timer))
2107 __in6_dev_put(idev);
2108 idev->mc_gq_running = 0;
2109 if (del_timer(&idev->mc_gq_timer))
2110 __in6_dev_put(idev);
2111
2112 for (i = idev->mc_list; i; i=i->next)
2113 igmp6_group_dropped(i);
2114 read_unlock_bh(&idev->lock);
2115
2116 mld_clear_delrec(idev);
2117 }
2118
2119
2120 /* Device going up */
2121
2122 void ipv6_mc_up(struct inet6_dev *idev)
2123 {
2124 struct ifmcaddr6 *i;
2125
2126 /* Install multicast list, except for all-nodes (already installed) */
2127
2128 read_lock_bh(&idev->lock);
2129 for (i = idev->mc_list; i; i=i->next)
2130 igmp6_group_added(i);
2131 read_unlock_bh(&idev->lock);
2132 }
2133
2134 /* IPv6 device initialization. */
2135
2136 void ipv6_mc_init_dev(struct inet6_dev *idev)
2137 {
2138 struct in6_addr maddr;
2139
2140 write_lock_bh(&idev->lock);
2141 rwlock_init(&idev->mc_lock);
2142 idev->mc_gq_running = 0;
2143 init_timer(&idev->mc_gq_timer);
2144 idev->mc_gq_timer.data = (unsigned long) idev;
2145 idev->mc_gq_timer.function = &mld_gq_timer_expire;
2146 idev->mc_tomb = NULL;
2147 idev->mc_ifc_count = 0;
2148 init_timer(&idev->mc_ifc_timer);
2149 idev->mc_ifc_timer.data = (unsigned long) idev;
2150 idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2151 idev->mc_qrv = MLD_QRV_DEFAULT;
2152 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2153 idev->mc_v1_seen = 0;
2154 write_unlock_bh(&idev->lock);
2155
2156 /* Add all-nodes address. */
2157 ipv6_addr_all_nodes(&maddr);
2158 ipv6_dev_mc_inc(idev->dev, &maddr);
2159 }
2160
2161 /*
2162 * Device is about to be destroyed: clean up.
2163 */
2164
2165 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2166 {
2167 struct ifmcaddr6 *i;
2168 struct in6_addr maddr;
2169
2170 /* Deactivate timers */
2171 ipv6_mc_down(idev);
2172
2173 /* Delete all-nodes address. */
2174 ipv6_addr_all_nodes(&maddr);
2175
2176 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2177 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2178 * fail.
2179 */
2180 __ipv6_dev_mc_dec(idev, &maddr);
2181
2182 if (idev->cnf.forwarding) {
2183 ipv6_addr_all_routers(&maddr);
2184 __ipv6_dev_mc_dec(idev, &maddr);
2185 }
2186
2187 write_lock_bh(&idev->lock);
2188 while ((i = idev->mc_list) != NULL) {
2189 idev->mc_list = i->next;
2190 write_unlock_bh(&idev->lock);
2191
2192 igmp6_group_dropped(i);
2193 ma_put(i);
2194
2195 write_lock_bh(&idev->lock);
2196 }
2197 write_unlock_bh(&idev->lock);
2198 }
2199
2200 #ifdef CONFIG_PROC_FS
2201 struct igmp6_mc_iter_state {
2202 struct net_device *dev;
2203 struct inet6_dev *idev;
2204 };
2205
2206 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2207
2208 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2209 {
2210 struct ifmcaddr6 *im = NULL;
2211 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2212
2213 for (state->dev = dev_base, state->idev = NULL;
2214 state->dev;
2215 state->dev = state->dev->next) {
2216 struct inet6_dev *idev;
2217 idev = in6_dev_get(state->dev);
2218 if (!idev)
2219 continue;
2220 read_lock_bh(&idev->lock);
2221 im = idev->mc_list;
2222 if (im) {
2223 state->idev = idev;
2224 break;
2225 }
2226 read_unlock_bh(&idev->lock);
2227 in6_dev_put(idev);
2228 }
2229 return im;
2230 }
2231
2232 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2233 {
2234 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2235
2236 im = im->next;
2237 while (!im) {
2238 if (likely(state->idev != NULL)) {
2239 read_unlock_bh(&state->idev->lock);
2240 in6_dev_put(state->idev);
2241 }
2242 state->dev = state->dev->next;
2243 if (!state->dev) {
2244 state->idev = NULL;
2245 break;
2246 }
2247 state->idev = in6_dev_get(state->dev);
2248 if (!state->idev)
2249 continue;
2250 read_lock_bh(&state->idev->lock);
2251 im = state->idev->mc_list;
2252 }
2253 return im;
2254 }
2255
2256 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2257 {
2258 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2259 if (im)
2260 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2261 --pos;
2262 return pos ? NULL : im;
2263 }
2264
2265 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2266 {
2267 read_lock(&dev_base_lock);
2268 return igmp6_mc_get_idx(seq, *pos);
2269 }
2270
2271 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2272 {
2273 struct ifmcaddr6 *im;
2274 im = igmp6_mc_get_next(seq, v);
2275 ++*pos;
2276 return im;
2277 }
2278
2279 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2280 {
2281 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2282 if (likely(state->idev != NULL)) {
2283 read_unlock_bh(&state->idev->lock);
2284 in6_dev_put(state->idev);
2285 state->idev = NULL;
2286 }
2287 state->dev = NULL;
2288 read_unlock(&dev_base_lock);
2289 }
2290
2291 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2292 {
2293 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2294 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2295
2296 seq_printf(seq,
2297 "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n",
2298 state->dev->ifindex, state->dev->name,
2299 NIP6(im->mca_addr),
2300 im->mca_users, im->mca_flags,
2301 (im->mca_flags&MAF_TIMER_RUNNING) ?
2302 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2303 return 0;
2304 }
2305
2306 static struct seq_operations igmp6_mc_seq_ops = {
2307 .start = igmp6_mc_seq_start,
2308 .next = igmp6_mc_seq_next,
2309 .stop = igmp6_mc_seq_stop,
2310 .show = igmp6_mc_seq_show,
2311 };
2312
2313 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2314 {
2315 struct seq_file *seq;
2316 int rc = -ENOMEM;
2317 struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2318
2319 if (!s)
2320 goto out;
2321
2322 rc = seq_open(file, &igmp6_mc_seq_ops);
2323 if (rc)
2324 goto out_kfree;
2325
2326 seq = file->private_data;
2327 seq->private = s;
2328 memset(s, 0, sizeof(*s));
2329 out:
2330 return rc;
2331 out_kfree:
2332 kfree(s);
2333 goto out;
2334 }
2335
2336 static struct file_operations igmp6_mc_seq_fops = {
2337 .owner = THIS_MODULE,
2338 .open = igmp6_mc_seq_open,
2339 .read = seq_read,
2340 .llseek = seq_lseek,
2341 .release = seq_release_private,
2342 };
2343
2344 struct igmp6_mcf_iter_state {
2345 struct net_device *dev;
2346 struct inet6_dev *idev;
2347 struct ifmcaddr6 *im;
2348 };
2349
2350 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2351
2352 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2353 {
2354 struct ip6_sf_list *psf = NULL;
2355 struct ifmcaddr6 *im = NULL;
2356 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2357
2358 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2359 state->dev;
2360 state->dev = state->dev->next) {
2361 struct inet6_dev *idev;
2362 idev = in6_dev_get(state->dev);
2363 if (unlikely(idev == NULL))
2364 continue;
2365 read_lock_bh(&idev->lock);
2366 im = idev->mc_list;
2367 if (likely(im != NULL)) {
2368 spin_lock_bh(&im->mca_lock);
2369 psf = im->mca_sources;
2370 if (likely(psf != NULL)) {
2371 state->im = im;
2372 state->idev = idev;
2373 break;
2374 }
2375 spin_unlock_bh(&im->mca_lock);
2376 }
2377 read_unlock_bh(&idev->lock);
2378 in6_dev_put(idev);
2379 }
2380 return psf;
2381 }
2382
2383 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2384 {
2385 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2386
2387 psf = psf->sf_next;
2388 while (!psf) {
2389 spin_unlock_bh(&state->im->mca_lock);
2390 state->im = state->im->next;
2391 while (!state->im) {
2392 if (likely(state->idev != NULL)) {
2393 read_unlock_bh(&state->idev->lock);
2394 in6_dev_put(state->idev);
2395 }
2396 state->dev = state->dev->next;
2397 if (!state->dev) {
2398 state->idev = NULL;
2399 goto out;
2400 }
2401 state->idev = in6_dev_get(state->dev);
2402 if (!state->idev)
2403 continue;
2404 read_lock_bh(&state->idev->lock);
2405 state->im = state->idev->mc_list;
2406 }
2407 if (!state->im)
2408 break;
2409 spin_lock_bh(&state->im->mca_lock);
2410 psf = state->im->mca_sources;
2411 }
2412 out:
2413 return psf;
2414 }
2415
2416 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2417 {
2418 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2419 if (psf)
2420 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2421 --pos;
2422 return pos ? NULL : psf;
2423 }
2424
2425 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2426 {
2427 read_lock(&dev_base_lock);
2428 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2429 }
2430
2431 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2432 {
2433 struct ip6_sf_list *psf;
2434 if (v == SEQ_START_TOKEN)
2435 psf = igmp6_mcf_get_first(seq);
2436 else
2437 psf = igmp6_mcf_get_next(seq, v);
2438 ++*pos;
2439 return psf;
2440 }
2441
2442 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2443 {
2444 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2445 if (likely(state->im != NULL)) {
2446 spin_unlock_bh(&state->im->mca_lock);
2447 state->im = NULL;
2448 }
2449 if (likely(state->idev != NULL)) {
2450 read_unlock_bh(&state->idev->lock);
2451 in6_dev_put(state->idev);
2452 state->idev = NULL;
2453 }
2454 state->dev = NULL;
2455 read_unlock(&dev_base_lock);
2456 }
2457
2458 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2459 {
2460 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2461 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2462
2463 if (v == SEQ_START_TOKEN) {
2464 seq_printf(seq,
2465 "%3s %6s "
2466 "%32s %32s %6s %6s\n", "Idx",
2467 "Device", "Multicast Address",
2468 "Source Address", "INC", "EXC");
2469 } else {
2470 seq_printf(seq,
2471 "%3d %6.6s "
2472 "%04x%04x%04x%04x%04x%04x%04x%04x "
2473 "%04x%04x%04x%04x%04x%04x%04x%04x "
2474 "%6lu %6lu\n",
2475 state->dev->ifindex, state->dev->name,
2476 NIP6(state->im->mca_addr),
2477 NIP6(psf->sf_addr),
2478 psf->sf_count[MCAST_INCLUDE],
2479 psf->sf_count[MCAST_EXCLUDE]);
2480 }
2481 return 0;
2482 }
2483
2484 static struct seq_operations igmp6_mcf_seq_ops = {
2485 .start = igmp6_mcf_seq_start,
2486 .next = igmp6_mcf_seq_next,
2487 .stop = igmp6_mcf_seq_stop,
2488 .show = igmp6_mcf_seq_show,
2489 };
2490
2491 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2492 {
2493 struct seq_file *seq;
2494 int rc = -ENOMEM;
2495 struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2496
2497 if (!s)
2498 goto out;
2499
2500 rc = seq_open(file, &igmp6_mcf_seq_ops);
2501 if (rc)
2502 goto out_kfree;
2503
2504 seq = file->private_data;
2505 seq->private = s;
2506 memset(s, 0, sizeof(*s));
2507 out:
2508 return rc;
2509 out_kfree:
2510 kfree(s);
2511 goto out;
2512 }
2513
2514 static struct file_operations igmp6_mcf_seq_fops = {
2515 .owner = THIS_MODULE,
2516 .open = igmp6_mcf_seq_open,
2517 .read = seq_read,
2518 .llseek = seq_lseek,
2519 .release = seq_release_private,
2520 };
2521 #endif
2522
2523 int __init igmp6_init(struct net_proto_family *ops)
2524 {
2525 struct ipv6_pinfo *np;
2526 struct sock *sk;
2527 int err;
2528
2529 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2530 if (err < 0) {
2531 printk(KERN_ERR
2532 "Failed to initialize the IGMP6 control socket (err %d).\n",
2533 err);
2534 igmp6_socket = NULL; /* For safety. */
2535 return err;
2536 }
2537
2538 sk = igmp6_socket->sk;
2539 sk->sk_allocation = GFP_ATOMIC;
2540 sk->sk_prot->unhash(sk);
2541
2542 np = inet6_sk(sk);
2543 np->hop_limit = 1;
2544
2545 #ifdef CONFIG_PROC_FS
2546 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2547 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2548 #endif
2549
2550 return 0;
2551 }
2552
2553 void igmp6_cleanup(void)
2554 {
2555 sock_release(igmp6_socket);
2556 igmp6_socket = NULL; /* for safety */
2557
2558 #ifdef CONFIG_PROC_FS
2559 proc_net_remove("mcfilter6");
2560 proc_net_remove("igmp6");
2561 #endif
2562 }
Linux kernel - Deliverables
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