1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <pedro_m@yahoo.com>
7 *
8 * $Id: mcast.c,v 1.38 2001/08/15 07:36:31 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-02.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/sched.h>
39 #include <linux/net.h>
40 #include <linux/in.h>
41 #include <linux/in6.h>
42 #include <linux/netdevice.h>
43 #include <linux/if_arp.h>
44 #include <linux/route.h>
45 #include <linux/init.h>
46 #include <linux/proc_fs.h>
47
48 #include <linux/netfilter.h>
49 #include <linux/netfilter_ipv6.h>
50
51 #include <net/sock.h>
52 #include <net/snmp.h>
53
54 #include <net/ipv6.h>
55 #include <net/protocol.h>
56 #include <net/if_inet6.h>
57 #include <net/ndisc.h>
58 #include <net/addrconf.h>
59 #include <net/ip6_route.h>
60
61 #include <net/checksum.h>
62
63 /* Set to 3 to get tracing... */
64 #define MCAST_DEBUG 2
65
66 #if MCAST_DEBUG >= 3
67 #define MDBG(x) printk x
68 #else
69 #define MDBG(x)
70 #endif
71
72 /*
73 * These header formats should be in a separate include file, but icmpv6.h
74 * doesn't have in6_addr defined in all cases, there is no __u128, and no
75 * other files reference these.
76 *
77 * +-DLS 4/14/03
78 */
79
80 /* Multicast Listener Discovery version 2 headers */
81
82 struct mld2_grec {
83 __u8 grec_type;
84 __u8 grec_auxwords;
85 __u16 grec_nsrcs;
86 struct in6_addr grec_mca;
87 struct in6_addr grec_src[0];
88 };
89
90 struct mld2_report {
91 __u8 type;
92 __u8 resv1;
93 __u16 csum;
94 __u16 resv2;
95 __u16 ngrec;
96 struct mld2_grec grec[0];
97 };
98
99 struct mld2_query {
100 __u8 type;
101 __u8 code;
102 __u16 csum;
103 __u16 mrc;
104 __u16 resv1;
105 struct in6_addr mca;
106 #if defined(__LITTLE_ENDIAN_BITFIELD)
107 __u8 qrv:3,
108 suppress:1,
109 resv2:4;
110 #elif defined(__BIG_ENDIAN_BITFIELD)
111 __u8 resv2:4,
112 suppress:1,
113 qrv:3;
114 #else
115 #error "Please fix <asm/byteorder.h>"
116 #endif
117 __u8 qqic;
118 __u16 nsrcs;
119 struct in6_addr srcs[0];
120 };
121
122 struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
123 struct in6_addr all_nodes_addr = {{{0xff,0x02,0,0,0,0,0,0,0,0,0,0,0,0,0,0x1}}};
124
125 /* Big mc list lock for all the sockets */
126 static rwlock_t ipv6_sk_mc_lock = RW_LOCK_UNLOCKED;
127
128 static struct socket *igmp6_socket;
129
130 static void igmp6_join_group(struct ifmcaddr6 *ma);
131 static void igmp6_leave_group(struct ifmcaddr6 *ma);
132 static void igmp6_timer_handler(unsigned long data);
133
134 static void mld_gq_timer_expire(unsigned long data);
135 static void mld_ifc_timer_expire(unsigned long data);
136 static void mld_ifc_event(struct inet6_dev *idev);
137 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
138 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
139 static void mld_clear_delrec(struct inet6_dev *idev);
140 static int sf_setstate(struct ifmcaddr6 *pmc);
141 static void sf_markstate(struct ifmcaddr6 *pmc);
142 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
143 int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, int sfmode,
144 int sfcount, struct in6_addr *psfsrc, int delta);
145 int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, int sfmode,
146 int sfcount, struct in6_addr *psfsrc, int delta);
147 int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
148 struct inet6_dev *idev);
149
150
151 #define IGMP6_UNSOLICITED_IVAL (10*HZ)
152 #define MLD_QRV_DEFAULT 2
153
154 #define MLD_V1_SEEN(idev) ((idev)->mc_v1_seen && \
155 time_before(jiffies, (idev)->mc_v1_seen))
156
157 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
158 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
159 ((value) < (thresh) ? (value) : \
160 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \
161 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
162
163 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
164 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
165
166 #define IPV6_MLD_MAX_MSF 10
167
168 int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF;
169
170 /*
171 * socket join on multicast group
172 */
173
ipv6_sock_mc_join(struct sock * sk,int ifindex,struct in6_addr * addr)174 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
175 {
176 struct net_device *dev = NULL;
177 struct ipv6_mc_socklist *mc_lst;
178 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
179 int err;
180
181 if (!(ipv6_addr_type(addr) & IPV6_ADDR_MULTICAST))
182 return -EINVAL;
183
184 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
185
186 if (mc_lst == NULL)
187 return -ENOMEM;
188
189 mc_lst->next = NULL;
190 memcpy(&mc_lst->addr, addr, sizeof(struct in6_addr));
191
192 if (ifindex == 0) {
193 struct rt6_info *rt;
194 rt = rt6_lookup(addr, NULL, 0, 0);
195 if (rt) {
196 dev = rt->rt6i_dev;
197 dev_hold(dev);
198 dst_release(&rt->u.dst);
199 }
200 } else
201 dev = dev_get_by_index(ifindex);
202
203 if (dev == NULL) {
204 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
205 return -ENODEV;
206 }
207
208 mc_lst->ifindex = dev->ifindex;
209 mc_lst->sfmode = MCAST_EXCLUDE;
210 mc_lst->sflist = 0;
211
212 /*
213 * now add/increase the group membership on the device
214 */
215
216 err = ipv6_dev_mc_inc(dev, addr);
217
218 if (err) {
219 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
220 dev_put(dev);
221 return err;
222 }
223
224 write_lock_bh(&ipv6_sk_mc_lock);
225 mc_lst->next = np->ipv6_mc_list;
226 np->ipv6_mc_list = mc_lst;
227 write_unlock_bh(&ipv6_sk_mc_lock);
228
229 dev_put(dev);
230
231 return 0;
232 }
233
234 /*
235 * socket leave on multicast group
236 */
ipv6_sock_mc_drop(struct sock * sk,int ifindex,struct in6_addr * addr)237 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
238 {
239 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
240 struct ipv6_mc_socklist *mc_lst, **lnk;
241
242 write_lock_bh(&ipv6_sk_mc_lock);
243 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
244 if (mc_lst->ifindex == ifindex &&
245 ipv6_addr_cmp(&mc_lst->addr, addr) == 0) {
246 struct net_device *dev;
247
248 *lnk = mc_lst->next;
249 write_unlock_bh(&ipv6_sk_mc_lock);
250
251 if ((dev = dev_get_by_index(ifindex)) != NULL) {
252 struct inet6_dev *idev = in6_dev_get(dev);
253
254 if (idev) {
255 (void) ip6_mc_leave_src(sk,mc_lst,idev);
256 in6_dev_put(idev);
257 }
258 ipv6_dev_mc_dec(dev, &mc_lst->addr);
259 dev_put(dev);
260 }
261 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
262 return 0;
263 }
264 }
265 write_unlock_bh(&ipv6_sk_mc_lock);
266
267 return -ENOENT;
268 }
269
ip6_mc_find_dev(struct in6_addr * group,int ifindex)270 struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
271 {
272 struct net_device *dev = 0;
273 struct inet6_dev *idev = 0;
274
275 if (ifindex == 0) {
276 struct rt6_info *rt;
277
278 rt = rt6_lookup(group, NULL, 0, 0);
279 if (rt) {
280 dev = rt->rt6i_dev;
281 dev_hold(dev);
282 dst_release(&rt->u.dst);
283 }
284 } else
285 dev = dev_get_by_index(ifindex);
286
287 if (!dev)
288 return 0;
289 idev = in6_dev_get(dev);
290 if (!idev) {
291 dev_put(dev);
292 return 0;
293 }
294 read_lock_bh(&idev->lock);
295 if (idev->dead) {
296 read_unlock_bh(&idev->lock);
297 in6_dev_put(idev);
298 dev_put(dev);
299 return 0;
300 }
301 return idev;
302 }
303
ipv6_sock_mc_close(struct sock * sk)304 void ipv6_sock_mc_close(struct sock *sk)
305 {
306 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
307 struct ipv6_mc_socklist *mc_lst;
308
309 write_lock_bh(&ipv6_sk_mc_lock);
310 while ((mc_lst = np->ipv6_mc_list) != NULL) {
311 struct net_device *dev;
312
313 np->ipv6_mc_list = mc_lst->next;
314 write_unlock_bh(&ipv6_sk_mc_lock);
315
316 dev = dev_get_by_index(mc_lst->ifindex);
317 if (dev) {
318 struct inet6_dev *idev = in6_dev_get(dev);
319
320 if (idev) {
321 (void) ip6_mc_leave_src(sk, mc_lst, idev);
322 in6_dev_put(idev);
323 }
324 ipv6_dev_mc_dec(dev, &mc_lst->addr);
325 dev_put(dev);
326 }
327
328 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
329
330 write_lock_bh(&ipv6_sk_mc_lock);
331 }
332 write_unlock_bh(&ipv6_sk_mc_lock);
333 }
334
ip6_mc_source(int add,int omode,struct sock * sk,struct group_source_req * pgsr)335 int ip6_mc_source(int add, int omode, struct sock *sk,
336 struct group_source_req *pgsr)
337 {
338 struct in6_addr *source, *group;
339 struct ipv6_mc_socklist *pmc;
340 struct net_device *dev;
341 struct inet6_dev *idev;
342 struct ipv6_pinfo *inet6 = &sk->net_pinfo.af_inet6;
343 struct ip6_sf_socklist *psl;
344 int i, j, rv;
345 int err;
346
347 if (pgsr->gsr_group.ss_family != AF_INET6 ||
348 pgsr->gsr_source.ss_family != AF_INET6)
349 return -EINVAL;
350
351 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
352 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
353
354 if (!(ipv6_addr_type(group) & IPV6_ADDR_MULTICAST))
355 return -EINVAL;
356
357 idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
358 if (!idev)
359 return -ENODEV;
360 dev = idev->dev;
361
362 err = -EADDRNOTAVAIL;
363
364 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
365 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
366 continue;
367 if (ipv6_addr_cmp(&pmc->addr, group) == 0)
368 break;
369 }
370 if (!pmc) /* must have a prior join */
371 goto done;
372 /* if a source filter was set, must be the same mode as before */
373 if (pmc->sflist) {
374 if (pmc->sfmode != omode)
375 goto done;
376 } else if (pmc->sfmode != omode) {
377 /* allow mode switches for empty-set filters */
378 ip6_mc_add_src(idev, group, omode, 0, 0, 0);
379 ip6_mc_del_src(idev, group, pmc->sfmode, 0, 0, 0);
380 pmc->sfmode = omode;
381 }
382
383 psl = pmc->sflist;
384 if (!add) {
385 if (!psl)
386 goto done;
387 rv = !0;
388 for (i=0; i<psl->sl_count; i++) {
389 rv = memcmp(&psl->sl_addr[i], source,
390 sizeof(struct in6_addr));
391 if (rv == 0)
392 break;
393 }
394 if (rv) /* source not found */
395 goto done;
396
397 /* update the interface filter */
398 ip6_mc_del_src(idev, group, omode, 1, source, 1);
399
400 for (j=i+1; j<psl->sl_count; j++)
401 psl->sl_addr[j-1] = psl->sl_addr[j];
402 psl->sl_count--;
403 err = 0;
404 goto done;
405 }
406 /* else, add a new source to the filter */
407
408 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
409 err = -ENOBUFS;
410 goto done;
411 }
412 if (!psl || psl->sl_count == psl->sl_max) {
413 struct ip6_sf_socklist *newpsl;
414 int count = IP6_SFBLOCK;
415
416 if (psl)
417 count += psl->sl_max;
418 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
419 IP6_SFLSIZE(count), GFP_ATOMIC);
420 if (!newpsl) {
421 err = -ENOBUFS;
422 goto done;
423 }
424 newpsl->sl_max = count;
425 newpsl->sl_count = count - IP6_SFBLOCK;
426 if (psl) {
427 for (i=0; i<psl->sl_count; i++)
428 newpsl->sl_addr[i] = psl->sl_addr[i];
429 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
430 }
431 pmc->sflist = psl = newpsl;
432 }
433 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
434 for (i=0; i<psl->sl_count; i++) {
435 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
436 if (rv == 0)
437 break;
438 }
439 if (rv == 0) /* address already there is an error */
440 goto done;
441 for (j=psl->sl_count-1; j>=i; j--)
442 psl->sl_addr[j+1] = psl->sl_addr[j];
443 psl->sl_addr[i] = *source;
444 psl->sl_count++;
445 err = 0;
446 /* update the interface list */
447 ip6_mc_add_src(idev, group, omode, 1, source, 1);
448 done:
449 read_unlock_bh(&idev->lock);
450 in6_dev_put(idev);
451 dev_put(dev);
452 return err;
453 }
454
ip6_mc_msfilter(struct sock * sk,struct group_filter * gsf)455 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
456 {
457 struct in6_addr *group;
458 struct ipv6_mc_socklist *pmc;
459 struct net_device *dev;
460 struct inet6_dev *idev;
461 struct ipv6_pinfo *inet6 = &sk->net_pinfo.af_inet6;
462 struct ip6_sf_socklist *newpsl, *psl;
463 int i, err;
464
465 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
466
467 if (!(ipv6_addr_type(group) & IPV6_ADDR_MULTICAST))
468 return -EINVAL;
469 if (gsf->gf_fmode != MCAST_INCLUDE &&
470 gsf->gf_fmode != MCAST_EXCLUDE)
471 return -EINVAL;
472
473 idev = ip6_mc_find_dev(group, gsf->gf_interface);
474
475 if (!idev)
476 return -ENODEV;
477 dev = idev->dev;
478 err = -EADDRNOTAVAIL;
479
480 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
481 if (pmc->ifindex != gsf->gf_interface)
482 continue;
483 if (ipv6_addr_cmp(&pmc->addr, group) == 0)
484 break;
485 }
486 if (!pmc) /* must have a prior join */
487 goto done;
488 if (gsf->gf_numsrc) {
489 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
490 IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
491 if (!newpsl) {
492 err = -ENOBUFS;
493 goto done;
494 }
495 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
496 for (i=0; i<newpsl->sl_count; ++i) {
497 struct sockaddr_in6 *psin6;
498
499 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
500 newpsl->sl_addr[i] = psin6->sin6_addr;
501 }
502 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
503 newpsl->sl_count, newpsl->sl_addr, 0);
504 if (err) {
505 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
506 goto done;
507 }
508 } else {
509 newpsl = NULL;
510 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
511 }
512
513 psl = pmc->sflist;
514 if (psl) {
515 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
516 psl->sl_count, psl->sl_addr, 0);
517 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
518 } else
519 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, 0, 0);
520 pmc->sflist = newpsl;
521 pmc->sfmode = gsf->gf_fmode;
522 done:
523 read_unlock_bh(&idev->lock);
524 in6_dev_put(idev);
525 dev_put(dev);
526 return err;
527 }
528
ip6_mc_msfget(struct sock * sk,struct group_filter * gsf,struct group_filter * optval,int * optlen)529 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
530 struct group_filter *optval, int *optlen)
531 {
532 int err, i, count, copycount;
533 struct in6_addr *group;
534 struct ipv6_mc_socklist *pmc;
535 struct inet6_dev *idev;
536 struct net_device *dev;
537 struct ipv6_pinfo *inet6 = &sk->net_pinfo.af_inet6;
538 struct ip6_sf_socklist *psl;
539
540 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
541
542 if (!(ipv6_addr_type(group) & IPV6_ADDR_MULTICAST))
543 return -EINVAL;
544
545 idev = ip6_mc_find_dev(group, gsf->gf_interface);
546
547 if (!idev)
548 return -ENODEV;
549
550 dev = idev->dev;
551
552 err = -EADDRNOTAVAIL;
553
554 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
555 if (pmc->ifindex != gsf->gf_interface)
556 continue;
557 if (ipv6_addr_cmp(group, &pmc->addr) == 0)
558 break;
559 }
560 if (!pmc) /* must have a prior join */
561 goto done;
562 gsf->gf_fmode = pmc->sfmode;
563 psl = pmc->sflist;
564 count = psl ? psl->sl_count : 0;
565 read_unlock_bh(&idev->lock);
566 in6_dev_put(idev);
567 dev_put(dev);
568
569 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
570 gsf->gf_numsrc = count;
571 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
572 copy_to_user((void *)optval, gsf, GROUP_FILTER_SIZE(0))) {
573 return -EFAULT;
574 }
575 for (i=0; i<copycount; i++) {
576 struct sockaddr_in6 *psin6;
577 struct sockaddr_storage ss;
578
579 psin6 = (struct sockaddr_in6 *)&ss;
580 memset(&ss, 0, sizeof(ss));
581 psin6->sin6_family = AF_INET6;
582 psin6->sin6_addr = psl->sl_addr[i];
583 if (copy_to_user((void *)&optval->gf_slist[i], &ss, sizeof(ss)))
584 return -EFAULT;
585 }
586 return 0;
587 done:
588 read_unlock_bh(&idev->lock);
589 in6_dev_put(idev);
590 dev_put(dev);
591 return err;
592 }
593
inet6_mc_check(struct sock * sk,struct in6_addr * mc_addr,struct in6_addr * src_addr)594 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
595 struct in6_addr *src_addr)
596 {
597 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
598 struct ipv6_mc_socklist *mc;
599 struct ip6_sf_socklist *psl;
600 int rv = 1;
601
602 read_lock(&ipv6_sk_mc_lock);
603 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
604 if (ipv6_addr_cmp(&mc->addr, mc_addr) == 0)
605 break;
606 }
607 if (!mc) {
608 read_unlock(&ipv6_sk_mc_lock);
609 return 1;
610 }
611 psl = mc->sflist;
612 if (!psl) {
613 rv = mc->sfmode == MCAST_EXCLUDE;
614 } else {
615 int i;
616
617 for (i=0; i<psl->sl_count; i++) {
618 if (ipv6_addr_cmp(&psl->sl_addr[i], src_addr) == 0)
619 break;
620 }
621 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
622 rv = 0;
623 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
624 rv = 0;
625 }
626 read_unlock(&ipv6_sk_mc_lock);
627
628 return rv;
629 }
630
ma_put(struct ifmcaddr6 * mc)631 static void ma_put(struct ifmcaddr6 *mc)
632 {
633 if (atomic_dec_and_test(&mc->mca_refcnt)) {
634 in6_dev_put(mc->idev);
635 kfree(mc);
636 }
637 }
638
igmp6_group_added(struct ifmcaddr6 * mc)639 static void igmp6_group_added(struct ifmcaddr6 *mc)
640 {
641 struct net_device *dev = mc->idev->dev;
642 char buf[MAX_ADDR_LEN];
643
644 spin_lock_bh(&mc->mca_lock);
645 if (!(mc->mca_flags&MAF_LOADED)) {
646 mc->mca_flags |= MAF_LOADED;
647 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
648 dev_mc_add(dev, buf, dev->addr_len, 0);
649 }
650 spin_unlock_bh(&mc->mca_lock);
651
652 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
653 return;
654
655 if (MLD_V1_SEEN(mc->idev)) {
656 igmp6_join_group(mc);
657 return;
658 }
659 /* else v2 */
660
661 mc->mca_crcount = mc->idev->mc_qrv;
662 mld_ifc_event(mc->idev);
663 }
664
igmp6_group_dropped(struct ifmcaddr6 * mc)665 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
666 {
667 struct net_device *dev = mc->idev->dev;
668 char buf[MAX_ADDR_LEN];
669
670 spin_lock_bh(&mc->mca_lock);
671 if (mc->mca_flags&MAF_LOADED) {
672 mc->mca_flags &= ~MAF_LOADED;
673 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
674 dev_mc_delete(dev, buf, dev->addr_len, 0);
675 }
676
677 if (mc->mca_flags & MAF_NOREPORT)
678 goto done;
679 spin_unlock_bh(&mc->mca_lock);
680
681 if (!mc->idev->dead)
682 igmp6_leave_group(mc);
683
684 spin_lock_bh(&mc->mca_lock);
685 if (del_timer(&mc->mca_timer))
686 atomic_dec(&mc->mca_refcnt);
687 done:
688 ip6_mc_clear_src(mc);
689 spin_unlock_bh(&mc->mca_lock);
690 }
691
692 /*
693 * deleted ifmcaddr6 manipulation
694 */
mld_add_delrec(struct inet6_dev * idev,struct ifmcaddr6 * im)695 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
696 {
697 struct ifmcaddr6 *pmc;
698
699 /* this is an "ifmcaddr6" for convenience; only the fields below
700 * are actually used. In particular, the refcnt and users are not
701 * used for management of the delete list. Using the same structure
702 * for deleted items allows change reports to use common code with
703 * non-deleted or query-response MCA's.
704 */
705 pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
706 if (!pmc)
707 return;
708 memset(pmc, 0, sizeof(*pmc));
709 spin_lock_bh(&im->mca_lock);
710 pmc->mca_lock = SPIN_LOCK_UNLOCKED;
711 pmc->idev = im->idev;
712 in6_dev_hold(idev);
713 pmc->mca_addr = im->mca_addr;
714 pmc->mca_crcount = idev->mc_qrv;
715 pmc->mca_sfmode = im->mca_sfmode;
716 if (pmc->mca_sfmode == MCAST_INCLUDE) {
717 struct ip6_sf_list *psf;
718
719 pmc->mca_tomb = im->mca_tomb;
720 pmc->mca_sources = im->mca_sources;
721 im->mca_tomb = im->mca_sources = 0;
722 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
723 psf->sf_crcount = pmc->mca_crcount;
724 }
725 spin_unlock_bh(&im->mca_lock);
726
727 write_lock_bh(&idev->mc_lock);
728 pmc->next = idev->mc_tomb;
729 idev->mc_tomb = pmc;
730 write_unlock_bh(&idev->mc_lock);
731 }
732
mld_del_delrec(struct inet6_dev * idev,struct in6_addr * pmca)733 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
734 {
735 struct ifmcaddr6 *pmc, *pmc_prev;
736 struct ip6_sf_list *psf, *psf_next;
737
738 write_lock_bh(&idev->mc_lock);
739 pmc_prev = 0;
740 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
741 if (ipv6_addr_cmp(&pmc->mca_addr, pmca) == 0)
742 break;
743 pmc_prev = pmc;
744 }
745 if (pmc) {
746 if (pmc_prev)
747 pmc_prev->next = pmc->next;
748 else
749 idev->mc_tomb = pmc->next;
750 }
751 write_unlock_bh(&idev->mc_lock);
752 if (pmc) {
753 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
754 psf_next = psf->sf_next;
755 kfree(psf);
756 }
757 in6_dev_put(pmc->idev);
758 kfree(pmc);
759 }
760 }
761
mld_clear_delrec(struct inet6_dev * idev)762 static void mld_clear_delrec(struct inet6_dev *idev)
763 {
764 struct ifmcaddr6 *pmc, *nextpmc;
765
766 write_lock_bh(&idev->mc_lock);
767 pmc = idev->mc_tomb;
768 idev->mc_tomb = 0;
769 write_unlock_bh(&idev->mc_lock);
770
771 for (; pmc; pmc = nextpmc) {
772 nextpmc = pmc->next;
773 ip6_mc_clear_src(pmc);
774 in6_dev_put(pmc->idev);
775 kfree(pmc);
776 }
777
778 /* clear dead sources, too */
779 read_lock_bh(&idev->lock);
780 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
781 struct ip6_sf_list *psf, *psf_next;
782
783 spin_lock_bh(&pmc->mca_lock);
784 psf = pmc->mca_tomb;
785 pmc->mca_tomb = 0;
786 spin_unlock_bh(&pmc->mca_lock);
787 for (; psf; psf=psf_next) {
788 psf_next = psf->sf_next;
789 kfree(psf);
790 }
791 }
792 read_unlock_bh(&idev->lock);
793 }
794
795
796 /*
797 * device multicast group inc (add if not found)
798 */
ipv6_dev_mc_inc(struct net_device * dev,struct in6_addr * addr)799 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
800 {
801 struct ifmcaddr6 *mc;
802 struct inet6_dev *idev;
803
804 idev = in6_dev_get(dev);
805
806 if (idev == NULL)
807 return -EINVAL;
808
809 write_lock_bh(&idev->lock);
810 if (idev->dead) {
811 write_unlock_bh(&idev->lock);
812 in6_dev_put(idev);
813 return -ENODEV;
814 }
815
816 for (mc = idev->mc_list; mc; mc = mc->next) {
817 if (ipv6_addr_cmp(&mc->mca_addr, addr) == 0) {
818 mc->mca_users++;
819 write_unlock_bh(&idev->lock);
820 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
821 0, 0);
822 in6_dev_put(idev);
823 return 0;
824 }
825 }
826
827 /*
828 * not found: create a new one.
829 */
830
831 mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
832
833 if (mc == NULL) {
834 write_unlock_bh(&idev->lock);
835 in6_dev_put(idev);
836 return -ENOMEM;
837 }
838
839 memset(mc, 0, sizeof(struct ifmcaddr6));
840 mc->mca_timer.function = igmp6_timer_handler;
841 mc->mca_timer.data = (unsigned long) mc;
842
843 memcpy(&mc->mca_addr, addr, sizeof(struct in6_addr));
844 mc->idev = idev;
845 mc->mca_users = 1;
846 atomic_set(&mc->mca_refcnt, 2);
847 mc->mca_lock = SPIN_LOCK_UNLOCKED;
848
849 /* initial mode is (EX, empty) */
850 mc->mca_sfmode = MCAST_EXCLUDE;
851 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
852
853 if (ipv6_addr_cmp(&mc->mca_addr, &all_nodes_addr) == 0 ||
854 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
855 mc->mca_flags |= MAF_NOREPORT;
856
857 mc->next = idev->mc_list;
858 idev->mc_list = mc;
859 write_unlock_bh(&idev->lock);
860
861 mld_del_delrec(idev, &mc->mca_addr);
862 igmp6_group_added(mc);
863 ma_put(mc);
864 return 0;
865 }
866
867 /*
868 * device multicast group del
869 */
__ipv6_dev_mc_dec(struct net_device * dev,struct inet6_dev * idev,struct in6_addr * addr)870 static int __ipv6_dev_mc_dec(struct net_device *dev, struct inet6_dev *idev, struct in6_addr *addr)
871 {
872 struct ifmcaddr6 *ma, **map;
873
874 write_lock_bh(&idev->lock);
875 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
876 if (ipv6_addr_cmp(&ma->mca_addr, addr) == 0) {
877 if (--ma->mca_users == 0) {
878 *map = ma->next;
879 write_unlock_bh(&idev->lock);
880
881 igmp6_group_dropped(ma);
882
883 ma_put(ma);
884 return 0;
885 }
886 write_unlock_bh(&idev->lock);
887 return 0;
888 }
889 }
890 write_unlock_bh(&idev->lock);
891
892 return -ENOENT;
893 }
894
ipv6_dev_mc_dec(struct net_device * dev,struct in6_addr * addr)895 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
896 {
897 struct inet6_dev *idev = in6_dev_get(dev);
898 int err;
899
900 if (!idev)
901 return -ENODEV;
902
903 err = __ipv6_dev_mc_dec(dev, idev, addr);
904
905 in6_dev_put(idev);
906
907 return err;
908 }
909
910 /*
911 * check if the interface/address pair is valid
912 */
ipv6_chk_mcast_addr(struct net_device * dev,struct in6_addr * group,struct in6_addr * src_addr)913 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
914 struct in6_addr *src_addr)
915 {
916 struct inet6_dev *idev;
917 struct ifmcaddr6 *mc;
918 int rv = 0;
919
920 idev = in6_dev_get(dev);
921 if (idev) {
922 read_lock_bh(&idev->lock);
923 for (mc = idev->mc_list; mc; mc=mc->next) {
924 if (ipv6_addr_cmp(&mc->mca_addr, group) == 0)
925 break;
926 }
927 if (mc) {
928 if (!ipv6_addr_any(src_addr)) {
929 struct ip6_sf_list *psf;
930
931 spin_lock_bh(&mc->mca_lock);
932 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
933 if (ipv6_addr_cmp(&psf->sf_addr,
934 src_addr) == 0)
935 break;
936 }
937 if (psf)
938 rv = psf->sf_count[MCAST_INCLUDE] ||
939 psf->sf_count[MCAST_EXCLUDE] !=
940 mc->mca_sfcount[MCAST_EXCLUDE];
941 else
942 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
943 spin_unlock_bh(&mc->mca_lock);
944 } else
945 rv = 1; /* don't filter unspecified source */
946 }
947 read_unlock_bh(&idev->lock);
948 in6_dev_put(idev);
949 }
950 return rv;
951 }
952
mld_gq_start_timer(struct inet6_dev * idev)953 static void mld_gq_start_timer(struct inet6_dev *idev)
954 {
955 int tv = net_random() % idev->mc_maxdelay;
956
957 idev->mc_gq_running = 1;
958 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
959 in6_dev_hold(idev);
960 }
961
mld_ifc_start_timer(struct inet6_dev * idev,int delay)962 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
963 {
964 int tv = net_random() % delay;
965
966 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
967 in6_dev_hold(idev);
968 }
969
970 /*
971 * IGMP handling (alias multicast ICMPv6 messages)
972 */
973
igmp6_group_queried(struct ifmcaddr6 * ma,unsigned long resptime)974 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
975 {
976 unsigned long delay = resptime;
977
978 /* Do not start timer for these addresses */
979 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
980 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
981 return;
982
983 if (del_timer(&ma->mca_timer)) {
984 atomic_dec(&ma->mca_refcnt);
985 delay = ma->mca_timer.expires - jiffies;
986 }
987
988 if (delay >= resptime) {
989 if (resptime)
990 delay = net_random() % resptime;
991 else
992 delay = 1;
993 }
994
995 ma->mca_timer.expires = jiffies + delay;
996 if (!mod_timer(&ma->mca_timer, jiffies + delay))
997 atomic_inc(&ma->mca_refcnt);
998 ma->mca_flags |= MAF_TIMER_RUNNING;
999 spin_unlock(&ma->mca_lock);
1000 }
1001
mld_marksources(struct ifmcaddr6 * pmc,int nsrcs,struct in6_addr * srcs)1002 static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1003 struct in6_addr *srcs)
1004 {
1005 struct ip6_sf_list *psf;
1006 int i, scount;
1007
1008 scount = 0;
1009 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1010 if (scount == nsrcs)
1011 break;
1012 for (i=0; i<nsrcs; i++)
1013 if (ipv6_addr_cmp(&srcs[i], &psf->sf_addr) == 0) {
1014 psf->sf_gsresp = 1;
1015 scount++;
1016 break;
1017 }
1018 }
1019 }
1020
igmp6_event_query(struct sk_buff * skb)1021 int igmp6_event_query(struct sk_buff *skb)
1022 {
1023 struct mld2_query *mlh2 = (struct mld2_query *) skb->h.raw;
1024 struct ifmcaddr6 *ma;
1025 struct in6_addr *group;
1026 unsigned long max_delay;
1027 struct inet6_dev *idev;
1028 struct icmp6hdr *hdr;
1029 int group_type;
1030 int mark = 0;
1031 int len;
1032
1033 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1034 return -EINVAL;
1035
1036 len = ntohs(skb->nh.ipv6h->payload_len);
1037
1038 /* Drop queries with not link local source */
1039 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1040 return -EINVAL;
1041
1042 idev = in6_dev_get(skb->dev);
1043
1044 if (idev == NULL)
1045 return 0;
1046
1047 hdr = (struct icmp6hdr *) skb->h.raw;
1048 group = (struct in6_addr *) (hdr + 1);
1049 group_type = ipv6_addr_type(group);
1050
1051 if (group_type != IPV6_ADDR_ANY &&
1052 !(group_type&IPV6_ADDR_MULTICAST)) {
1053 in6_dev_put(idev);
1054 return -EINVAL;
1055 }
1056
1057 if (len == 24) {
1058 int switchback;
1059 /* MLDv1 router present */
1060
1061 /* Translate milliseconds to jiffies */
1062 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1063
1064 switchback = (idev->mc_qrv + 1) * max_delay;
1065 idev->mc_v1_seen = jiffies + switchback;
1066
1067 /* cancel the interface change timer */
1068 idev->mc_ifc_count = 0;
1069 if (del_timer(&idev->mc_ifc_timer))
1070 __in6_dev_put(idev);
1071 /* clear deleted report items */
1072 mld_clear_delrec(idev);
1073 } else if (len >= 28) {
1074 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1075 if (!max_delay)
1076 max_delay = 1;
1077 idev->mc_maxdelay = max_delay;
1078 if (mlh2->qrv)
1079 idev->mc_qrv = mlh2->qrv;
1080 if (group_type == IPV6_ADDR_ANY) { /* general query */
1081 if (mlh2->nsrcs) {
1082 in6_dev_put(idev);
1083 return -EINVAL; /* no sources allowed */
1084 }
1085 mld_gq_start_timer(idev);
1086 in6_dev_put(idev);
1087 return 0;
1088 }
1089 /* mark sources to include, if group & source-specific */
1090 mark = mlh2->nsrcs != 0;
1091 } else {
1092 in6_dev_put(idev);
1093 return -EINVAL;
1094 }
1095
1096 read_lock_bh(&idev->lock);
1097 if (group_type == IPV6_ADDR_ANY) {
1098 for (ma = idev->mc_list; ma; ma=ma->next) {
1099 spin_lock_bh(&ma->mca_lock);
1100 igmp6_group_queried(ma, max_delay);
1101 spin_unlock_bh(&ma->mca_lock);
1102 }
1103 } else {
1104 for (ma = idev->mc_list; ma; ma=ma->next) {
1105 if (group_type != IPV6_ADDR_ANY &&
1106 ipv6_addr_cmp(group, &ma->mca_addr) != 0)
1107 continue;
1108 spin_lock_bh(&ma->mca_lock);
1109 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1110 /* gsquery <- gsquery && mark */
1111 if (!mark)
1112 ma->mca_flags &= ~MAF_GSQUERY;
1113 } else {
1114 /* gsquery <- mark */
1115 if (mark)
1116 ma->mca_flags |= MAF_GSQUERY;
1117 else
1118 ma->mca_flags &= ~MAF_GSQUERY;
1119 }
1120 if (ma->mca_flags & MAF_GSQUERY)
1121 mld_marksources(ma, ntohs(mlh2->nsrcs),
1122 mlh2->srcs);
1123 igmp6_group_queried(ma, max_delay);
1124 spin_unlock_bh(&ma->mca_lock);
1125 if (group_type != IPV6_ADDR_ANY)
1126 break;
1127 }
1128 }
1129 read_unlock_bh(&idev->lock);
1130 in6_dev_put(idev);
1131
1132 return 0;
1133 }
1134
1135
igmp6_event_report(struct sk_buff * skb)1136 int igmp6_event_report(struct sk_buff *skb)
1137 {
1138 struct ifmcaddr6 *ma;
1139 struct in6_addr *addrp;
1140 struct inet6_dev *idev;
1141 struct icmp6hdr *hdr;
1142 int addr_type;
1143
1144 /* Our own report looped back. Ignore it. */
1145 if (skb->pkt_type == PACKET_LOOPBACK)
1146 return 0;
1147
1148 /* send our report if the MC router may not have heard this report */
1149 if (skb->pkt_type != PACKET_MULTICAST &&
1150 skb->pkt_type != PACKET_BROADCAST)
1151 return 0;
1152
1153 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1154 return -EINVAL;
1155
1156 hdr = (struct icmp6hdr*) skb->h.raw;
1157
1158 /* Drop reports with not link local source */
1159 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1160 if (addr_type != IPV6_ADDR_ANY &&
1161 !(addr_type&IPV6_ADDR_LINKLOCAL))
1162 return -EINVAL;
1163
1164 addrp = (struct in6_addr *) (hdr + 1);
1165
1166 idev = in6_dev_get(skb->dev);
1167 if (idev == NULL)
1168 return -ENODEV;
1169
1170 /*
1171 * Cancel the timer for this group
1172 */
1173
1174 read_lock_bh(&idev->lock);
1175 for (ma = idev->mc_list; ma; ma=ma->next) {
1176 if (ipv6_addr_cmp(&ma->mca_addr, addrp) == 0) {
1177 spin_lock(&ma->mca_lock);
1178 if (del_timer(&ma->mca_timer))
1179 atomic_dec(&ma->mca_refcnt);
1180 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1181 spin_unlock(&ma->mca_lock);
1182 break;
1183 }
1184 }
1185 read_unlock_bh(&idev->lock);
1186 in6_dev_put(idev);
1187 return 0;
1188 }
1189
is_in(struct ifmcaddr6 * pmc,struct ip6_sf_list * psf,int type,int gdeleted,int sdeleted)1190 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1191 int gdeleted, int sdeleted)
1192 {
1193 switch (type) {
1194 case MLD2_MODE_IS_INCLUDE:
1195 case MLD2_MODE_IS_EXCLUDE:
1196 if (gdeleted || sdeleted)
1197 return 0;
1198 return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
1199 case MLD2_CHANGE_TO_INCLUDE:
1200 if (gdeleted || sdeleted)
1201 return 0;
1202 return psf->sf_count[MCAST_INCLUDE] != 0;
1203 case MLD2_CHANGE_TO_EXCLUDE:
1204 if (gdeleted || sdeleted)
1205 return 0;
1206 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1207 psf->sf_count[MCAST_INCLUDE])
1208 return 0;
1209 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1210 psf->sf_count[MCAST_EXCLUDE];
1211 case MLD2_ALLOW_NEW_SOURCES:
1212 if (gdeleted || !psf->sf_crcount)
1213 return 0;
1214 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1215 case MLD2_BLOCK_OLD_SOURCES:
1216 if (pmc->mca_sfmode == MCAST_INCLUDE)
1217 return gdeleted || (psf->sf_crcount && sdeleted);
1218 return psf->sf_crcount && !gdeleted && !sdeleted;
1219 }
1220 return 0;
1221 }
1222
1223 static int
mld_scount(struct ifmcaddr6 * pmc,int type,int gdeleted,int sdeleted)1224 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1225 {
1226 struct ip6_sf_list *psf;
1227 int scount = 0;
1228
1229 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1230 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1231 continue;
1232 scount++;
1233 }
1234 return scount;
1235 }
1236
mld_newpack(struct net_device * dev,int size)1237 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1238 {
1239 struct sock *sk = igmp6_socket->sk;
1240 struct sk_buff *skb;
1241 struct mld2_report *pmr;
1242 struct in6_addr addr_buf;
1243 int err;
1244 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1245 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1246 IPV6_TLV_PADN, 0 };
1247
1248 skb = sock_alloc_send_skb(sk, size + dev->hard_header_len+15, 1, &err);
1249
1250 if (skb == 0)
1251 return 0;
1252
1253 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1254
1255 if (ipv6_get_lladdr(dev, &addr_buf)) {
1256 /* <draft-ietf-magma-mld-source-02.txt>:
1257 * use unspecified address as the source address
1258 * when a valid link-local address is not available.
1259 */
1260 memset(&addr_buf, 0, sizeof(addr_buf));
1261 }
1262
1263 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1264
1265 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1266
1267 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1268 skb->h.raw = (unsigned char *)pmr;
1269 pmr->type = ICMPV6_MLD2_REPORT;
1270 pmr->resv1 = 0;
1271 pmr->csum = 0;
1272 pmr->resv2 = 0;
1273 pmr->ngrec = 0;
1274 return skb;
1275 }
1276
mld_dev_queue_xmit2(struct sk_buff * skb)1277 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1278 {
1279 struct net_device *dev = skb->dev;
1280
1281 if (dev->hard_header) {
1282 unsigned char ha[MAX_ADDR_LEN];
1283 int err;
1284
1285 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1286 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1287 if (err < 0) {
1288 kfree_skb(skb);
1289 return err;
1290 }
1291 }
1292 return dev_queue_xmit(skb);
1293 }
1294
mld_dev_queue_xmit(struct sk_buff * skb)1295 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1296 {
1297 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1298 mld_dev_queue_xmit2);
1299 }
1300
mld_sendpack(struct sk_buff * skb)1301 static void mld_sendpack(struct sk_buff *skb)
1302 {
1303 struct ipv6hdr *pip6 = skb->nh.ipv6h;
1304 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1305 int payload_len, mldlen, err;
1306
1307 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1308 sizeof(struct ipv6hdr);
1309 mldlen = skb->tail - skb->h.raw;
1310 pip6->payload_len = htons(payload_len);
1311
1312 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1313 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1314 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1315 mld_dev_queue_xmit);
1316 if (!err)
1317 ICMP6_INC_STATS(Icmp6OutMsgs);
1318 }
1319
grec_size(struct ifmcaddr6 * pmc,int type,int gdel,int sdel)1320 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1321 {
1322 return sizeof(struct mld2_grec) + 4*mld_scount(pmc,type,gdel,sdel);
1323 }
1324
add_grhead(struct sk_buff * skb,struct ifmcaddr6 * pmc,int type,struct mld2_grec ** ppgr)1325 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1326 int type, struct mld2_grec **ppgr)
1327 {
1328 struct net_device *dev = pmc->idev->dev;
1329 struct mld2_report *pmr;
1330 struct mld2_grec *pgr;
1331
1332 if (!skb)
1333 skb = mld_newpack(dev, dev->mtu);
1334 if (!skb)
1335 return 0;
1336 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1337 pgr->grec_type = type;
1338 pgr->grec_auxwords = 0;
1339 pgr->grec_nsrcs = 0;
1340 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1341 pmr = (struct mld2_report *)skb->h.raw;
1342 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1343 *ppgr = pgr;
1344 return skb;
1345 }
1346
1347 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1348 skb_tailroom(skb)) : 0)
1349
add_grec(struct sk_buff * skb,struct ifmcaddr6 * pmc,int type,int gdeleted,int sdeleted)1350 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1351 int type, int gdeleted, int sdeleted)
1352 {
1353 struct net_device *dev = pmc->idev->dev;
1354 struct mld2_report *pmr;
1355 struct mld2_grec *pgr = 0;
1356 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1357 int scount, first, isquery, truncate;
1358
1359 if (pmc->mca_flags & MAF_NOREPORT)
1360 return skb;
1361
1362 isquery = type == MLD2_MODE_IS_INCLUDE ||
1363 type == MLD2_MODE_IS_EXCLUDE;
1364 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1365 type == MLD2_CHANGE_TO_EXCLUDE;
1366
1367 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1368
1369 if (!*psf_list) {
1370 if (type == MLD2_ALLOW_NEW_SOURCES ||
1371 type == MLD2_BLOCK_OLD_SOURCES)
1372 return skb;
1373 if (pmc->mca_crcount || isquery) {
1374 /* make sure we have room for group header and at
1375 * least one source.
1376 */
1377 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
1378 sizeof(struct in6_addr)) {
1379 mld_sendpack(skb);
1380 skb = 0; /* add_grhead will get a new one */
1381 }
1382 skb = add_grhead(skb, pmc, type, &pgr);
1383 }
1384 return skb;
1385 }
1386 pmr = skb ? (struct mld2_report *)skb->h.raw : 0;
1387
1388 /* EX and TO_EX get a fresh packet, if needed */
1389 if (truncate) {
1390 if (pmr && pmr->ngrec &&
1391 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1392 if (skb)
1393 mld_sendpack(skb);
1394 skb = mld_newpack(dev, dev->mtu);
1395 }
1396 }
1397 first = 1;
1398 scount = 0;
1399 psf_prev = 0;
1400 for (psf=*psf_list; psf; psf=psf_next) {
1401 struct in6_addr *psrc;
1402
1403 psf_next = psf->sf_next;
1404
1405 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1406 psf_prev = psf;
1407 continue;
1408 }
1409
1410 /* clear marks on query responses */
1411 if (isquery)
1412 psf->sf_gsresp = 0;
1413
1414 if (AVAILABLE(skb) < sizeof(*psrc) +
1415 first*sizeof(struct mld2_grec)) {
1416 if (truncate && !first)
1417 break; /* truncate these */
1418 if (pgr)
1419 pgr->grec_nsrcs = htons(scount);
1420 if (skb)
1421 mld_sendpack(skb);
1422 skb = mld_newpack(dev, dev->mtu);
1423 first = 1;
1424 scount = 0;
1425 }
1426 if (first) {
1427 skb = add_grhead(skb, pmc, type, &pgr);
1428 first = 0;
1429 }
1430 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1431 *psrc = psf->sf_addr;
1432 scount++;
1433 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1434 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1435 psf->sf_crcount--;
1436 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1437 if (psf_prev)
1438 psf_prev->sf_next = psf->sf_next;
1439 else
1440 *psf_list = psf->sf_next;
1441 kfree(psf);
1442 continue;
1443 }
1444 }
1445 psf_prev = psf;
1446 }
1447 if (pgr)
1448 pgr->grec_nsrcs = htons(scount);
1449
1450 if (isquery)
1451 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1452 return skb;
1453 }
1454
mld_send_report(struct inet6_dev * idev,struct ifmcaddr6 * pmc)1455 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1456 {
1457 struct sk_buff *skb = 0;
1458 int type;
1459
1460 if (!pmc) {
1461 read_lock_bh(&idev->lock);
1462 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1463 if (pmc->mca_flags & MAF_NOREPORT)
1464 continue;
1465 spin_lock_bh(&pmc->mca_lock);
1466 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1467 type = MLD2_MODE_IS_EXCLUDE;
1468 else
1469 type = MLD2_MODE_IS_INCLUDE;
1470 skb = add_grec(skb, pmc, type, 0, 0);
1471 spin_unlock_bh(&pmc->mca_lock);
1472 }
1473 read_unlock_bh(&idev->lock);
1474 } else {
1475 spin_lock_bh(&pmc->mca_lock);
1476 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1477 type = MLD2_MODE_IS_EXCLUDE;
1478 else
1479 type = MLD2_MODE_IS_INCLUDE;
1480 skb = add_grec(skb, pmc, type, 0, 0);
1481 spin_unlock_bh(&pmc->mca_lock);
1482 }
1483 if (skb)
1484 mld_sendpack(skb);
1485 }
1486
1487 /*
1488 * remove zero-count source records from a source filter list
1489 */
mld_clear_zeros(struct ip6_sf_list ** ppsf)1490 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1491 {
1492 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1493
1494 psf_prev = 0;
1495 for (psf=*ppsf; psf; psf = psf_next) {
1496 psf_next = psf->sf_next;
1497 if (psf->sf_crcount == 0) {
1498 if (psf_prev)
1499 psf_prev->sf_next = psf->sf_next;
1500 else
1501 *ppsf = psf->sf_next;
1502 kfree(psf);
1503 } else
1504 psf_prev = psf;
1505 }
1506 }
1507
mld_send_cr(struct inet6_dev * idev)1508 static void mld_send_cr(struct inet6_dev *idev)
1509 {
1510 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1511 struct sk_buff *skb = 0;
1512 int type, dtype;
1513
1514 read_lock_bh(&idev->lock);
1515 write_lock_bh(&idev->mc_lock);
1516
1517 /* deleted MCA's */
1518 pmc_prev = 0;
1519 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1520 pmc_next = pmc->next;
1521 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1522 type = MLD2_BLOCK_OLD_SOURCES;
1523 dtype = MLD2_BLOCK_OLD_SOURCES;
1524 skb = add_grec(skb, pmc, type, 1, 0);
1525 skb = add_grec(skb, pmc, dtype, 1, 1);
1526 }
1527 if (pmc->mca_crcount) {
1528 pmc->mca_crcount--;
1529 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1530 type = MLD2_CHANGE_TO_INCLUDE;
1531 skb = add_grec(skb, pmc, type, 1, 0);
1532 }
1533 if (pmc->mca_crcount == 0) {
1534 mld_clear_zeros(&pmc->mca_tomb);
1535 mld_clear_zeros(&pmc->mca_sources);
1536 }
1537 }
1538 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1539 !pmc->mca_sources) {
1540 if (pmc_prev)
1541 pmc_prev->next = pmc_next;
1542 else
1543 idev->mc_tomb = pmc_next;
1544 in6_dev_put(pmc->idev);
1545 kfree(pmc);
1546 } else
1547 pmc_prev = pmc;
1548 }
1549 write_unlock_bh(&idev->mc_lock);
1550
1551 /* change recs */
1552 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1553 spin_lock_bh(&pmc->mca_lock);
1554 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1555 type = MLD2_BLOCK_OLD_SOURCES;
1556 dtype = MLD2_ALLOW_NEW_SOURCES;
1557 } else {
1558 type = MLD2_ALLOW_NEW_SOURCES;
1559 dtype = MLD2_BLOCK_OLD_SOURCES;
1560 }
1561 skb = add_grec(skb, pmc, type, 0, 0);
1562 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1563
1564 /* filter mode changes */
1565 if (pmc->mca_crcount) {
1566 pmc->mca_crcount--;
1567 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1568 type = MLD2_CHANGE_TO_EXCLUDE;
1569 else
1570 type = MLD2_CHANGE_TO_INCLUDE;
1571 skb = add_grec(skb, pmc, type, 0, 0);
1572 }
1573 spin_unlock_bh(&pmc->mca_lock);
1574 }
1575 read_unlock_bh(&idev->lock);
1576 if (!skb)
1577 return;
1578 (void) mld_sendpack(skb);
1579 }
1580
igmp6_send(struct in6_addr * addr,struct net_device * dev,int type)1581 void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1582 {
1583 struct sock *sk = igmp6_socket->sk;
1584 struct sk_buff *skb;
1585 struct icmp6hdr *hdr;
1586 struct in6_addr *snd_addr;
1587 struct in6_addr *addrp;
1588 struct in6_addr addr_buf;
1589 struct in6_addr all_routers;
1590 int err, len, payload_len, full_len;
1591 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1592 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1593 IPV6_TLV_PADN, 0 };
1594
1595 snd_addr = addr;
1596 if (type == ICMPV6_MGM_REDUCTION) {
1597 snd_addr = &all_routers;
1598 ipv6_addr_all_routers(&all_routers);
1599 }
1600
1601 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1602 payload_len = len + sizeof(ra);
1603 full_len = sizeof(struct ipv6hdr) + payload_len;
1604
1605 skb = sock_alloc_send_skb(sk, dev->hard_header_len + full_len + 15, 1, &err);
1606
1607 if (skb == NULL)
1608 return;
1609
1610 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1611
1612 if (ipv6_get_lladdr(dev, &addr_buf)) {
1613 /* <draft-ietf-magma-mld-source-02.txt>:
1614 * use unspecified address as the source address
1615 * when a valid link-local address is not available.
1616 */
1617 memset(&addr_buf, 0, sizeof(addr_buf));
1618 }
1619
1620 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1621
1622 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1623
1624 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1625 memset(hdr, 0, sizeof(struct icmp6hdr));
1626 hdr->icmp6_type = type;
1627
1628 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1629 ipv6_addr_copy(addrp, addr);
1630
1631 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1632 IPPROTO_ICMPV6,
1633 csum_partial((__u8 *) hdr, len, 0));
1634
1635 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1636 mld_dev_queue_xmit);
1637 if (!err) {
1638 if (type == ICMPV6_MGM_REDUCTION)
1639 ICMP6_INC_STATS(Icmp6OutGroupMembReductions);
1640 else
1641 ICMP6_INC_STATS(Icmp6OutGroupMembResponses);
1642 ICMP6_INC_STATS(Icmp6OutMsgs);
1643 }
1644
1645 return;
1646 }
1647
ip6_mc_del1_src(struct ifmcaddr6 * pmc,int sfmode,struct in6_addr * psfsrc)1648 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1649 struct in6_addr *psfsrc)
1650 {
1651 struct ip6_sf_list *psf, *psf_prev;
1652 int rv = 0;
1653
1654 psf_prev = 0;
1655 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1656 if (ipv6_addr_cmp(&psf->sf_addr, psfsrc) == 0)
1657 break;
1658 psf_prev = psf;
1659 }
1660 if (!psf || psf->sf_count[sfmode] == 0) {
1661 /* source filter not found, or count wrong => bug */
1662 return -ESRCH;
1663 }
1664 psf->sf_count[sfmode]--;
1665 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1666 struct inet6_dev *idev = pmc->idev;
1667
1668 /* no more filters for this source */
1669 if (psf_prev)
1670 psf_prev->sf_next = psf->sf_next;
1671 else
1672 pmc->mca_sources = psf->sf_next;
1673 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1674 !MLD_V1_SEEN(idev)) {
1675 psf->sf_crcount = idev->mc_qrv;
1676 psf->sf_next = pmc->mca_tomb;
1677 pmc->mca_tomb = psf;
1678 rv = 1;
1679 } else
1680 kfree(psf);
1681 }
1682 return rv;
1683 }
1684
ip6_mc_del_src(struct inet6_dev * idev,struct in6_addr * pmca,int sfmode,int sfcount,struct in6_addr * psfsrc,int delta)1685 int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, int sfmode,
1686 int sfcount, struct in6_addr *psfsrc, int delta)
1687 {
1688 struct ifmcaddr6 *pmc;
1689 int changerec = 0;
1690 int i, err;
1691
1692 if (!idev)
1693 return -ENODEV;
1694 read_lock_bh(&idev->lock);
1695 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1696 if (ipv6_addr_cmp(pmca, &pmc->mca_addr) == 0)
1697 break;
1698 }
1699 if (!pmc) {
1700 /* MCA not found?? bug */
1701 read_unlock_bh(&idev->lock);
1702 return -ESRCH;
1703 }
1704 spin_lock_bh(&pmc->mca_lock);
1705 sf_markstate(pmc);
1706 if (!delta) {
1707 if (!pmc->mca_sfcount[sfmode]) {
1708 spin_unlock_bh(&pmc->mca_lock);
1709 read_unlock_bh(&idev->lock);
1710 return -EINVAL;
1711 }
1712 pmc->mca_sfcount[sfmode]--;
1713 }
1714 err = 0;
1715 for (i=0; i<sfcount; i++) {
1716 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1717
1718 changerec |= rv > 0;
1719 if (!err && rv < 0)
1720 err = rv;
1721 }
1722 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1723 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1724 pmc->mca_sfcount[MCAST_INCLUDE]) {
1725 struct ip6_sf_list *psf;
1726
1727 /* filter mode change */
1728 pmc->mca_sfmode = MCAST_INCLUDE;
1729 pmc->mca_crcount = idev->mc_qrv;
1730 idev->mc_ifc_count = pmc->mca_crcount;
1731 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1732 psf->sf_crcount = 0;
1733 mld_ifc_event(pmc->idev);
1734 } else if (sf_setstate(pmc) || changerec)
1735 mld_ifc_event(pmc->idev);
1736 spin_unlock_bh(&pmc->mca_lock);
1737 read_unlock_bh(&idev->lock);
1738 return err;
1739 }
1740
1741 /*
1742 * Add multicast single-source filter to the interface list
1743 */
ip6_mc_add1_src(struct ifmcaddr6 * pmc,int sfmode,struct in6_addr * psfsrc,int delta)1744 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1745 struct in6_addr *psfsrc, int delta)
1746 {
1747 struct ip6_sf_list *psf, *psf_prev;
1748
1749 psf_prev = 0;
1750 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1751 if (ipv6_addr_cmp(&psf->sf_addr, psfsrc) == 0)
1752 break;
1753 psf_prev = psf;
1754 }
1755 if (!psf) {
1756 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1757 if (!psf)
1758 return -ENOBUFS;
1759 memset(psf, 0, sizeof(*psf));
1760 psf->sf_addr = *psfsrc;
1761 if (psf_prev) {
1762 psf_prev->sf_next = psf;
1763 } else
1764 pmc->mca_sources = psf;
1765 }
1766 psf->sf_count[sfmode]++;
1767 return 0;
1768 }
1769
sf_markstate(struct ifmcaddr6 * pmc)1770 static void sf_markstate(struct ifmcaddr6 *pmc)
1771 {
1772 struct ip6_sf_list *psf;
1773 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1774
1775 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1776 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1777 psf->sf_oldin = mca_xcount ==
1778 psf->sf_count[MCAST_EXCLUDE] &&
1779 !psf->sf_count[MCAST_INCLUDE];
1780 } else
1781 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1782 }
1783
sf_setstate(struct ifmcaddr6 * pmc)1784 static int sf_setstate(struct ifmcaddr6 *pmc)
1785 {
1786 struct ip6_sf_list *psf;
1787 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1788 int qrv = pmc->idev->mc_qrv;
1789 int new_in, rv;
1790
1791 rv = 0;
1792 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1793 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1794 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1795 !psf->sf_count[MCAST_INCLUDE];
1796 } else
1797 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1798 if (new_in != psf->sf_oldin) {
1799 psf->sf_crcount = qrv;
1800 rv++;
1801 }
1802 }
1803 return rv;
1804 }
1805
1806 /*
1807 * Add multicast source filter list to the interface list
1808 */
ip6_mc_add_src(struct inet6_dev * idev,struct in6_addr * pmca,int sfmode,int sfcount,struct in6_addr * psfsrc,int delta)1809 int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, int sfmode,
1810 int sfcount, struct in6_addr *psfsrc, int delta)
1811 {
1812 struct ifmcaddr6 *pmc;
1813 int isexclude;
1814 int i, err;
1815
1816 if (!idev)
1817 return -ENODEV;
1818 read_lock_bh(&idev->lock);
1819 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1820 if (ipv6_addr_cmp(pmca, &pmc->mca_addr) == 0)
1821 break;
1822 }
1823 if (!pmc) {
1824 /* MCA not found?? bug */
1825 read_unlock_bh(&idev->lock);
1826 return -ESRCH;
1827 }
1828 spin_lock_bh(&pmc->mca_lock);
1829
1830 sf_markstate(pmc);
1831 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
1832 if (!delta)
1833 pmc->mca_sfcount[sfmode]++;
1834 err = 0;
1835 for (i=0; i<sfcount; i++) {
1836 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1837 if (err)
1838 break;
1839 }
1840 if (err) {
1841 int j;
1842
1843 pmc->mca_sfcount[sfmode]--;
1844 for (j=0; j<i; j++)
1845 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1846 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1847 struct inet6_dev *idev = pmc->idev;
1848 struct ip6_sf_list *psf;
1849
1850 /* filter mode change */
1851 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1852 pmc->mca_sfmode = MCAST_EXCLUDE;
1853 else if (pmc->mca_sfcount[MCAST_INCLUDE])
1854 pmc->mca_sfmode = MCAST_INCLUDE;
1855 /* else no filters; keep old mode for reports */
1856
1857 pmc->mca_crcount = idev->mc_qrv;
1858 idev->mc_ifc_count = pmc->mca_crcount;
1859 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1860 psf->sf_crcount = 0;
1861 mld_ifc_event(idev);
1862 } else if (sf_setstate(pmc))
1863 mld_ifc_event(idev);
1864 spin_unlock_bh(&pmc->mca_lock);
1865 read_unlock_bh(&idev->lock);
1866 return err;
1867 }
1868
ip6_mc_clear_src(struct ifmcaddr6 * pmc)1869 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
1870 {
1871 struct ip6_sf_list *psf, *nextpsf;
1872
1873 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
1874 nextpsf = psf->sf_next;
1875 kfree(psf);
1876 }
1877 pmc->mca_tomb = 0;
1878 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
1879 nextpsf = psf->sf_next;
1880 kfree(psf);
1881 }
1882 pmc->mca_sources = 0;
1883 pmc->mca_sfmode = MCAST_EXCLUDE;
1884 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1885 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
1886 }
1887
igmp6_join_group(struct ifmcaddr6 * ma)1888 static void igmp6_join_group(struct ifmcaddr6 *ma)
1889 {
1890 unsigned long delay;
1891
1892 if (ma->mca_flags & MAF_NOREPORT)
1893 return;
1894
1895 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
1896
1897 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
1898
1899 spin_lock_bh(&ma->mca_lock);
1900 if (del_timer(&ma->mca_timer)) {
1901 atomic_dec(&ma->mca_refcnt);
1902 delay = ma->mca_timer.expires - jiffies;
1903 }
1904
1905 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1906 atomic_inc(&ma->mca_refcnt);
1907 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
1908 spin_unlock_bh(&ma->mca_lock);
1909 }
1910
ip6_mc_leave_src(struct sock * sk,struct ipv6_mc_socklist * iml,struct inet6_dev * idev)1911 int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
1912 struct inet6_dev *idev)
1913 {
1914 int err;
1915
1916 if (iml->sflist == 0) {
1917 /* any-source empty exclude case */
1918 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, 0, 0);
1919 }
1920 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
1921 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
1922 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
1923 iml->sflist = 0;
1924 return err;
1925 }
1926
igmp6_leave_group(struct ifmcaddr6 * ma)1927 static void igmp6_leave_group(struct ifmcaddr6 *ma)
1928 {
1929 if (MLD_V1_SEEN(ma->idev)) {
1930 if (ma->mca_flags & MAF_LAST_REPORTER)
1931 igmp6_send(&ma->mca_addr, ma->idev->dev,
1932 ICMPV6_MGM_REDUCTION);
1933 } else {
1934 mld_add_delrec(ma->idev, ma);
1935 mld_ifc_event(ma->idev);
1936 }
1937 }
1938
mld_gq_timer_expire(unsigned long data)1939 static void mld_gq_timer_expire(unsigned long data)
1940 {
1941 struct inet6_dev *idev = (struct inet6_dev *)data;
1942
1943 idev->mc_gq_running = 0;
1944 mld_send_report(idev, 0);
1945 __in6_dev_put(idev);
1946 }
1947
mld_ifc_timer_expire(unsigned long data)1948 static void mld_ifc_timer_expire(unsigned long data)
1949 {
1950 struct inet6_dev *idev = (struct inet6_dev *)data;
1951
1952 mld_send_cr(idev);
1953 if (idev->mc_ifc_count) {
1954 idev->mc_ifc_count--;
1955 if (idev->mc_ifc_count)
1956 mld_ifc_start_timer(idev, idev->mc_maxdelay);
1957 }
1958 __in6_dev_put(idev);
1959 }
1960
mld_ifc_event(struct inet6_dev * idev)1961 static void mld_ifc_event(struct inet6_dev *idev)
1962 {
1963 if (MLD_V1_SEEN(idev))
1964 return;
1965 idev->mc_ifc_count = idev->mc_qrv;
1966 mld_ifc_start_timer(idev, 1);
1967 }
1968
1969
igmp6_timer_handler(unsigned long data)1970 static void igmp6_timer_handler(unsigned long data)
1971 {
1972 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
1973
1974 if (MLD_V1_SEEN(ma->idev))
1975 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
1976 else
1977 mld_send_report(ma->idev, ma);
1978
1979 spin_lock(&ma->mca_lock);
1980 ma->mca_flags |= MAF_LAST_REPORTER;
1981 ma->mca_flags &= ~MAF_TIMER_RUNNING;
1982 spin_unlock(&ma->mca_lock);
1983 ma_put(ma);
1984 }
1985
1986 /* Device going down */
1987
ipv6_mc_down(struct inet6_dev * idev)1988 void ipv6_mc_down(struct inet6_dev *idev)
1989 {
1990 struct ifmcaddr6 *i;
1991
1992 /* Withdraw multicast list */
1993
1994 read_lock_bh(&idev->lock);
1995 idev->mc_ifc_count = 0;
1996 if (del_timer(&idev->mc_ifc_timer))
1997 __in6_dev_put(idev);
1998 idev->mc_gq_running = 0;
1999 if (del_timer(&idev->mc_gq_timer))
2000 __in6_dev_put(idev);
2001
2002 for (i = idev->mc_list; i; i=i->next)
2003 igmp6_group_dropped(i);
2004 read_unlock_bh(&idev->lock);
2005
2006 mld_clear_delrec(idev);
2007 }
2008
2009
2010 /* Device going up */
2011
ipv6_mc_up(struct inet6_dev * idev)2012 void ipv6_mc_up(struct inet6_dev *idev)
2013 {
2014 struct ifmcaddr6 *i;
2015
2016 /* Install multicast list, except for all-nodes (already installed) */
2017
2018 read_lock_bh(&idev->lock);
2019 for (i = idev->mc_list; i; i=i->next)
2020 igmp6_group_added(i);
2021 read_unlock_bh(&idev->lock);
2022 }
2023
2024 /* IPv6 device initialization. */
2025
ipv6_mc_init_dev(struct inet6_dev * idev)2026 void ipv6_mc_init_dev(struct inet6_dev *idev)
2027 {
2028 struct in6_addr maddr;
2029
2030 write_lock_bh(&idev->lock);
2031 idev->mc_lock = RW_LOCK_UNLOCKED;
2032 idev->mc_gq_running = 0;
2033 init_timer(&idev->mc_gq_timer);
2034 idev->mc_gq_timer.data = (unsigned long) idev;
2035 idev->mc_gq_timer.function = &mld_gq_timer_expire;
2036 idev->mc_tomb = 0;
2037 idev->mc_ifc_count = 0;
2038 init_timer(&idev->mc_ifc_timer);
2039 idev->mc_ifc_timer.data = (unsigned long) idev;
2040 idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2041 idev->mc_qrv = MLD_QRV_DEFAULT;
2042 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2043 idev->mc_v1_seen = 0;
2044 write_unlock_bh(&idev->lock);
2045
2046 /* Add all-nodes address. */
2047 ipv6_addr_all_nodes(&maddr);
2048 ipv6_dev_mc_inc(idev->dev, &maddr);
2049 }
2050
2051 /*
2052 * Device is about to be destroyed: clean up.
2053 */
2054
ipv6_mc_destroy_dev(struct inet6_dev * idev)2055 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2056 {
2057 struct ifmcaddr6 *i;
2058 struct in6_addr maddr;
2059
2060 /* Deactivate timers */
2061 ipv6_mc_down(idev);
2062
2063 /* Delete all-nodes address. */
2064 ipv6_addr_all_nodes(&maddr);
2065
2066 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2067 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2068 * fail.
2069 */
2070 __ipv6_dev_mc_dec(idev->dev, idev, &maddr);
2071
2072 write_lock_bh(&idev->lock);
2073 while ((i = idev->mc_list) != NULL) {
2074 idev->mc_list = i->next;
2075 write_unlock_bh(&idev->lock);
2076
2077 igmp6_group_dropped(i);
2078 ma_put(i);
2079
2080 write_lock_bh(&idev->lock);
2081 }
2082 write_unlock_bh(&idev->lock);
2083 }
2084
2085 #ifdef CONFIG_PROC_FS
igmp6_read_proc(char * buffer,char ** start,off_t offset,int length,int * eof,void * data)2086 static int igmp6_read_proc(char *buffer, char **start, off_t offset,
2087 int length, int *eof, void *data)
2088 {
2089 off_t pos=0, begin=0;
2090 struct ifmcaddr6 *im;
2091 int len=0;
2092 struct net_device *dev;
2093
2094 read_lock(&dev_base_lock);
2095 for (dev = dev_base; dev; dev = dev->next) {
2096 struct inet6_dev *idev;
2097
2098 if ((idev = in6_dev_get(dev)) == NULL)
2099 continue;
2100
2101 read_lock_bh(&idev->lock);
2102 for (im = idev->mc_list; im; im = im->next) {
2103 int i;
2104
2105 len += sprintf(buffer+len,"%-4d %-15s ", dev->ifindex, dev->name);
2106
2107 for (i=0; i<16; i++)
2108 len += sprintf(buffer+len, "%02x", im->mca_addr.s6_addr[i]);
2109
2110 len+=sprintf(buffer+len,
2111 " %5d %08X %ld\n",
2112 im->mca_users,
2113 im->mca_flags,
2114 (im->mca_flags&MAF_TIMER_RUNNING) ? im->mca_timer.expires-jiffies : 0);
2115
2116 pos=begin+len;
2117 if (pos < offset) {
2118 len=0;
2119 begin=pos;
2120 }
2121 if (pos > offset+length) {
2122 read_unlock_bh(&idev->lock);
2123 in6_dev_put(idev);
2124 goto done;
2125 }
2126 }
2127 read_unlock_bh(&idev->lock);
2128 in6_dev_put(idev);
2129 }
2130 *eof = 1;
2131
2132 done:
2133 read_unlock(&dev_base_lock);
2134
2135 *start=buffer+(offset-begin);
2136 len-=(offset-begin);
2137 if(len>length)
2138 len=length;
2139 if (len<0)
2140 len=0;
2141 return len;
2142 }
2143
ip6_mcf_read_proc(char * buffer,char ** start,off_t offset,int length,int * eof,void * data)2144 static int ip6_mcf_read_proc(char *buffer, char **start, off_t offset,
2145 int length, int *eof, void *data)
2146 {
2147 off_t pos=0, begin=0;
2148 int len=0;
2149 int first=1;
2150 struct net_device *dev;
2151
2152 read_lock(&dev_base_lock);
2153 for (dev=dev_base; dev; dev=dev->next) {
2154 struct inet6_dev *idev = in6_dev_get(dev);
2155 struct ifmcaddr6 *imc;
2156
2157 if (idev == NULL)
2158 continue;
2159
2160 read_lock_bh(&idev->lock);
2161
2162 for (imc=idev->mc_list; imc; imc=imc->next) {
2163 struct ip6_sf_list *psf;
2164 unsigned long i;
2165
2166 spin_lock_bh(&imc->mca_lock);
2167 for (psf=imc->mca_sources; psf; psf=psf->sf_next) {
2168 if (first) {
2169 len += sprintf(buffer+len, "%3s %6s "
2170 "%32s %32s %6s %6s\n", "Idx",
2171 "Device", "Multicast Address",
2172 "Source Address", "INC", "EXC");
2173 first = 0;
2174 }
2175 len += sprintf(buffer+len,"%3d %6.6s ",
2176 dev->ifindex, dev->name);
2177
2178 for (i=0; i<16; i++)
2179 len += sprintf(buffer+len, "%02x",
2180 imc->mca_addr.s6_addr[i]);
2181 buffer[len++] = ' ';
2182 for (i=0; i<16; i++)
2183 len += sprintf(buffer+len, "%02x",
2184 psf->sf_addr.s6_addr[i]);
2185 len += sprintf(buffer+len, " %6lu %6lu\n",
2186 psf->sf_count[MCAST_INCLUDE],
2187 psf->sf_count[MCAST_EXCLUDE]);
2188 pos = begin+len;
2189 if (pos < offset) {
2190 len=0;
2191 begin=pos;
2192 }
2193 if (pos > offset+length) {
2194 spin_unlock_bh(&imc->mca_lock);
2195 read_unlock_bh(&idev->lock);
2196 in6_dev_put(idev);
2197 goto done;
2198 }
2199 }
2200 spin_unlock_bh(&imc->mca_lock);
2201 }
2202 read_unlock_bh(&idev->lock);
2203 in6_dev_put(idev);
2204 }
2205 *eof = 1;
2206
2207 done:
2208 read_unlock(&dev_base_lock);
2209
2210 *start=buffer+(offset-begin);
2211 len-=(offset-begin);
2212 if(len>length)
2213 len=length;
2214 if (len<0)
2215 len=0;
2216 return len;
2217 }
2218 #endif
2219
igmp6_init(struct net_proto_family * ops)2220 int __init igmp6_init(struct net_proto_family *ops)
2221 {
2222 struct sock *sk;
2223 int err;
2224
2225 igmp6_socket = sock_alloc();
2226 if (igmp6_socket == NULL) {
2227 printk(KERN_ERR
2228 "Failed to create the IGMP6 control socket.\n");
2229 return -1;
2230 }
2231 igmp6_socket->inode->i_uid = 0;
2232 igmp6_socket->inode->i_gid = 0;
2233 igmp6_socket->type = SOCK_RAW;
2234
2235 if((err = ops->create(igmp6_socket, IPPROTO_ICMPV6)) < 0) {
2236 printk(KERN_DEBUG
2237 "Failed to initialize the IGMP6 control socket (err %d).\n",
2238 err);
2239 sock_release(igmp6_socket);
2240 igmp6_socket = NULL; /* For safety. */
2241 return err;
2242 }
2243
2244 sk = igmp6_socket->sk;
2245 sk->allocation = GFP_ATOMIC;
2246 sk->prot->unhash(sk);
2247
2248 sk->net_pinfo.af_inet6.hop_limit = 1;
2249 #ifdef CONFIG_PROC_FS
2250 create_proc_read_entry("net/igmp6", 0, 0, igmp6_read_proc, NULL);
2251 create_proc_read_entry("net/mcfilter6", 0, 0, ip6_mcf_read_proc, NULL);
2252 #endif
2253
2254 return 0;
2255 }
2256
igmp6_cleanup(void)2257 void igmp6_cleanup(void)
2258 {
2259 sock_release(igmp6_socket);
2260 igmp6_socket = NULL; /* for safety */
2261 #ifdef CONFIG_PROC_FS
2262 remove_proc_entry("net/igmp6", 0);
2263 #endif
2264 }
2265