1 /*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
11 * Version: $Id: igmp.c,v 1.41 2000/08/31 23:39:12 davem Exp $
12 *
13 * Authors:
14 * Alan Cox <Alan.Cox@linux.org>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 *
21 * Fixes:
22 *
23 * Alan Cox : Added lots of __inline__ to optimise
24 * the memory usage of all the tiny little
25 * functions.
26 * Alan Cox : Dumped the header building experiment.
27 * Alan Cox : Minor tweaks ready for multicast routing
28 * and extended IGMP protocol.
29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
30 * writes utterly bogus code otherwise (sigh)
31 * fixed IGMP loopback to behave in the manner
32 * desired by mrouted, fixed the fact it has been
33 * broken since 1.3.6 and cleaned up a few minor
34 * points.
35 *
36 * Chih-Jen Chang : Tried to revise IGMP to Version 2
37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
38 * The enhancements are mainly based on Steve Deering's
39 * ipmulti-3.5 source code.
40 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
41 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
42 * the mrouted version on that device.
43 * Chih-Jen Chang : Added the max_resp_time parameter to
44 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
45 * to identify the multicast router version
46 * and do what the IGMP version 2 specified.
47 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
48 * Tsu-Sheng Tsao if the specified time expired.
49 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
50 * Alan Cox : Use GFP_ATOMIC in the right places.
51 * Christian Daudt : igmp timer wasn't set for local group
52 * memberships but was being deleted,
53 * which caused a "del_timer() called
54 * from %p with timer not initialized\n"
55 * message (960131).
56 * Christian Daudt : removed del_timer from
57 * igmp_timer_expire function (960205).
58 * Christian Daudt : igmp_heard_report now only calls
59 * igmp_timer_expire if tm->running is
60 * true (960216).
61 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
62 * igmp_heard_query never trigger. Expiry
63 * miscalculation fixed in igmp_heard_query
64 * and random() made to return unsigned to
65 * prevent negative expiry times.
66 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
67 * fix from pending 2.1.x patches.
68 * Alan Cox: Forget to enable FDDI support earlier.
69 * Alexey Kuznetsov: Fixed leaving groups on device down.
70 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
71 */
72
73
74 #include <linux/config.h>
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/types.h>
78 #include <linux/kernel.h>
79 #include <linux/sched.h>
80 #include <linux/string.h>
81 #include <linux/socket.h>
82 #include <linux/sockios.h>
83 #include <linux/in.h>
84 #include <linux/inet.h>
85 #include <linux/netdevice.h>
86 #include <linux/skbuff.h>
87 #include <linux/inetdevice.h>
88 #include <linux/igmp.h>
89 #include <linux/if_arp.h>
90 #include <linux/rtnetlink.h>
91 #include <net/ip.h>
92 #include <net/protocol.h>
93 #include <net/route.h>
94 #include <net/sock.h>
95 #include <net/checksum.h>
96 #include <linux/netfilter_ipv4.h>
97 #ifdef CONFIG_IP_MROUTE
98 #include <linux/mroute.h>
99 #endif
100
101
102 #define IP_MAX_MEMBERSHIPS 20
103
104 #ifdef CONFIG_IP_MULTICAST
105
106
107 /* Parameter names and values are taken from igmp-v2-06 draft */
108
109 #define IGMP_V1_Router_Present_Timeout (400*HZ)
110 #define IGMP_Unsolicited_Report_Interval (10*HZ)
111 #define IGMP_Query_Response_Interval (10*HZ)
112 #define IGMP_Unsolicited_Report_Count 2
113
114
115 #define IGMP_Initial_Report_Delay (1*HZ)
116
117 /* IGMP_Initial_Report_Delay is not from IGMP specs!
118 * IGMP specs require to report membership immediately after
119 * joining a group, but we delay the first report by a
120 * small interval. It seems more natural and still does not
121 * contradict to specs provided this delay is small enough.
122 */
123
124 #define IGMP_V1_SEEN(in_dev) ((in_dev)->mr_v1_seen && (long)(jiffies - (in_dev)->mr_v1_seen) < 0)
125
126 #endif
127
128 static void ip_ma_put(struct ip_mc_list *im)
129 {
130 if (atomic_dec_and_test(&im->refcnt)) {
131 in_dev_put(im->interface);
132 kfree(im);
133 }
134 }
135
136 #ifdef CONFIG_IP_MULTICAST
137
138 /*
139 * Timer management
140 */
141
142 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
143 {
144 spin_lock_bh(&im->lock);
145 if (del_timer(&im->timer))
146 atomic_dec(&im->refcnt);
147 im->tm_running=0;
148 im->reporter = 0;
149 im->unsolicit_count = 0;
150 spin_unlock_bh(&im->lock);
151 }
152
153 /* It must be called with locked im->lock */
154 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
155 {
156 int tv=net_random() % max_delay;
157
158 im->tm_running=1;
159 if (!mod_timer(&im->timer, jiffies+tv+2))
160 atomic_inc(&im->refcnt);
161 }
162
163 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
164 {
165 spin_lock_bh(&im->lock);
166 im->unsolicit_count = 0;
167 if (del_timer(&im->timer)) {
168 if ((long)(im->timer.expires-jiffies) < max_delay) {
169 add_timer(&im->timer);
170 im->tm_running=1;
171 spin_unlock_bh(&im->lock);
172 return;
173 }
174 atomic_dec(&im->refcnt);
175 }
176 igmp_start_timer(im, max_delay);
177 spin_unlock_bh(&im->lock);
178 }
179
180
181 /*
182 * Send an IGMP report.
183 */
184
185 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
186
187 /* Don't just hand NF_HOOK skb->dst->output, in case netfilter hook
188 changes route */
189 static inline int
190 output_maybe_reroute(struct sk_buff *skb)
191 {
192 return skb->dst->output(skb);
193 }
194
195 static int igmp_send_report(struct net_device *dev, u32 group, int type)
196 {
197 struct sk_buff *skb;
198 struct iphdr *iph;
199 struct igmphdr *ih;
200 struct rtable *rt;
201 u32 dst;
202
203 /* According to IGMPv2 specs, LEAVE messages are
204 * sent to all-routers group.
205 */
206 dst = group;
207 if (type == IGMP_HOST_LEAVE_MESSAGE)
208 dst = IGMP_ALL_ROUTER;
209
210 if (ip_route_output(&rt, dst, 0, 0, dev->ifindex))
211 return -1;
212 if (rt->rt_src == 0) {
213 ip_rt_put(rt);
214 return -1;
215 }
216
217 skb=alloc_skb(IGMP_SIZE+dev->hard_header_len+15, GFP_ATOMIC);
218 if (skb == NULL) {
219 ip_rt_put(rt);
220 return -1;
221 }
222
223 skb->dst = &rt->u.dst;
224
225 skb_reserve(skb, (dev->hard_header_len+15)&~15);
226
227 skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
228
229 iph->version = 4;
230 iph->ihl = (sizeof(struct iphdr)+4)>>2;
231 iph->tos = 0;
232 iph->frag_off = __constant_htons(IP_DF);
233 iph->ttl = 1;
234 iph->daddr = dst;
235 iph->saddr = rt->rt_src;
236 iph->protocol = IPPROTO_IGMP;
237 iph->tot_len = htons(IGMP_SIZE);
238 ip_select_ident(iph, &rt->u.dst);
239 ((u8*)&iph[1])[0] = IPOPT_RA;
240 ((u8*)&iph[1])[1] = 4;
241 ((u8*)&iph[1])[2] = 0;
242 ((u8*)&iph[1])[3] = 0;
243 ip_send_check(iph);
244
245 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
246 ih->type=type;
247 ih->code=0;
248 ih->csum=0;
249 ih->group=group;
250 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
251
252 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
253 output_maybe_reroute);
254 }
255
256
257 static void igmp_timer_expire(unsigned long data)
258 {
259 struct ip_mc_list *im=(struct ip_mc_list *)data;
260 struct in_device *in_dev = im->interface;
261 int err;
262
263 spin_lock(&im->lock);
264 im->tm_running=0;
265
266 if (IGMP_V1_SEEN(in_dev))
267 err = igmp_send_report(in_dev->dev, im->multiaddr, IGMP_HOST_MEMBERSHIP_REPORT);
268 else
269 err = igmp_send_report(in_dev->dev, im->multiaddr, IGMP_HOST_NEW_MEMBERSHIP_REPORT);
270
271 /* Failed. Retry later. */
272 if (err) {
273 if (!in_dev->dead)
274 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
275 goto out;
276 }
277
278 if (im->unsolicit_count) {
279 im->unsolicit_count--;
280 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
281 }
282 im->reporter = 1;
283 out:
284 spin_unlock(&im->lock);
285 ip_ma_put(im);
286 }
287
288 static void igmp_heard_report(struct in_device *in_dev, u32 group)
289 {
290 struct ip_mc_list *im;
291
292 /* Timers are only set for non-local groups */
293
294 if (group == IGMP_ALL_HOSTS)
295 return;
296
297 read_lock(&in_dev->lock);
298 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
299 if (im->multiaddr == group) {
300 igmp_stop_timer(im);
301 break;
302 }
303 }
304 read_unlock(&in_dev->lock);
305 }
306
307 static void igmp_heard_query(struct in_device *in_dev, unsigned char max_resp_time,
308 u32 group)
309 {
310 struct ip_mc_list *im;
311 int max_delay;
312
313 max_delay = max_resp_time*(HZ/IGMP_TIMER_SCALE);
314
315 if (max_resp_time == 0) {
316 /* Alas, old v1 router presents here. */
317
318 max_delay = IGMP_Query_Response_Interval;
319 in_dev->mr_v1_seen = jiffies + IGMP_V1_Router_Present_Timeout;
320 group = 0;
321 }
322
323 /*
324 * - Start the timers in all of our membership records
325 * that the query applies to for the interface on
326 * which the query arrived excl. those that belong
327 * to a "local" group (224.0.0.X)
328 * - For timers already running check if they need to
329 * be reset.
330 * - Use the igmp->igmp_code field as the maximum
331 * delay possible
332 */
333 read_lock(&in_dev->lock);
334 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
335 if (group && group != im->multiaddr)
336 continue;
337 if (im->multiaddr == IGMP_ALL_HOSTS)
338 continue;
339 igmp_mod_timer(im, max_delay);
340 }
341 read_unlock(&in_dev->lock);
342 }
343
344 int igmp_rcv(struct sk_buff *skb, unsigned short len)
345 {
346 /* This basically follows the spec line by line -- see RFC1112 */
347 struct igmphdr *ih = skb->h.igmph;
348 struct in_device *in_dev = in_dev_get(skb->dev);
349
350 if (in_dev==NULL) {
351 kfree_skb(skb);
352 return 0;
353 }
354
355 if (len < sizeof(struct igmphdr) || ip_compute_csum((void *)ih, len)) {
356 in_dev_put(in_dev);
357 kfree_skb(skb);
358 return 0;
359 }
360
361 switch (ih->type) {
362 case IGMP_HOST_MEMBERSHIP_QUERY:
363 igmp_heard_query(in_dev, ih->code, ih->group);
364 break;
365 case IGMP_HOST_MEMBERSHIP_REPORT:
366 case IGMP_HOST_NEW_MEMBERSHIP_REPORT:
367 /* Is it our report looped back? */
368 if (((struct rtable*)skb->dst)->key.iif == 0)
369 break;
370 igmp_heard_report(in_dev, ih->group);
371 break;
372 case IGMP_PIM:
373 #ifdef CONFIG_IP_PIMSM_V1
374 in_dev_put(in_dev);
375 return pim_rcv_v1(skb, len);
376 #endif
377 case IGMP_DVMRP:
378 case IGMP_TRACE:
379 case IGMP_HOST_LEAVE_MESSAGE:
380 case IGMP_MTRACE:
381 case IGMP_MTRACE_RESP:
382 break;
383 default:
384 NETDEBUG(printk(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type));
385 }
386 in_dev_put(in_dev);
387 kfree_skb(skb);
388 return 0;
389 }
390
391 #endif
392
393
394 /*
395 * Add a filter to a device
396 */
397
398 static void ip_mc_filter_add(struct in_device *in_dev, u32 addr)
399 {
400 char buf[MAX_ADDR_LEN];
401 struct net_device *dev = in_dev->dev;
402
403 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
404 We will get multicast token leakage, when IFF_MULTICAST
405 is changed. This check should be done in dev->set_multicast_list
406 routine. Something sort of:
407 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
408 --ANK
409 */
410 if (arp_mc_map(addr, buf, dev, 0) == 0)
411 dev_mc_add(dev,buf,dev->addr_len,0);
412 }
413
414 /*
415 * Remove a filter from a device
416 */
417
418 static void ip_mc_filter_del(struct in_device *in_dev, u32 addr)
419 {
420 char buf[MAX_ADDR_LEN];
421 struct net_device *dev = in_dev->dev;
422
423 if (arp_mc_map(addr, buf, dev, 0) == 0)
424 dev_mc_delete(dev,buf,dev->addr_len,0);
425 }
426
427 static void igmp_group_dropped(struct ip_mc_list *im)
428 {
429 #ifdef CONFIG_IP_MULTICAST
430 int reporter;
431 #endif
432
433 if (im->loaded) {
434 im->loaded = 0;
435 ip_mc_filter_del(im->interface, im->multiaddr);
436 }
437
438 #ifdef CONFIG_IP_MULTICAST
439 if (im->multiaddr == IGMP_ALL_HOSTS)
440 return;
441
442 reporter = im->reporter;
443 igmp_stop_timer(im);
444
445 if (reporter && !IGMP_V1_SEEN(im->interface))
446 igmp_send_report(im->interface->dev, im->multiaddr, IGMP_HOST_LEAVE_MESSAGE);
447 #endif
448 }
449
450 static void igmp_group_added(struct ip_mc_list *im)
451 {
452 if (im->loaded == 0) {
453 im->loaded = 1;
454 ip_mc_filter_add(im->interface, im->multiaddr);
455 }
456
457 #ifdef CONFIG_IP_MULTICAST
458 if (im->multiaddr == IGMP_ALL_HOSTS)
459 return;
460
461 spin_lock_bh(&im->lock);
462 igmp_start_timer(im, IGMP_Initial_Report_Delay);
463 spin_unlock_bh(&im->lock);
464 #endif
465 }
466
467
468 /*
469 * Multicast list managers
470 */
471
472
473 /*
474 * A socket has joined a multicast group on device dev.
475 */
476
477 void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
478 {
479 struct ip_mc_list *im;
480
481 ASSERT_RTNL();
482
483 for (im=in_dev->mc_list; im; im=im->next) {
484 if (im->multiaddr == addr) {
485 im->users++;
486 goto out;
487 }
488 }
489
490 im = (struct ip_mc_list *)kmalloc(sizeof(*im), GFP_KERNEL);
491 if (!im)
492 goto out;
493
494 im->users=1;
495 im->interface=in_dev;
496 in_dev_hold(in_dev);
497 im->multiaddr=addr;
498 atomic_set(&im->refcnt, 1);
499 spin_lock_init(&im->lock);
500 #ifdef CONFIG_IP_MULTICAST
501 im->tm_running=0;
502 init_timer(&im->timer);
503 im->timer.data=(unsigned long)im;
504 im->timer.function=&igmp_timer_expire;
505 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
506 im->reporter = 0;
507 im->loaded = 0;
508 #endif
509 write_lock_bh(&in_dev->lock);
510 im->next=in_dev->mc_list;
511 in_dev->mc_list=im;
512 write_unlock_bh(&in_dev->lock);
513 igmp_group_added(im);
514 if (in_dev->dev->flags & IFF_UP)
515 ip_rt_multicast_event(in_dev);
516 out:
517 return;
518 }
519
520 /*
521 * A socket has left a multicast group on device dev
522 */
523
524 int ip_mc_dec_group(struct in_device *in_dev, u32 addr)
525 {
526 int err = -ESRCH;
527 struct ip_mc_list *i, **ip;
528
529 ASSERT_RTNL();
530
531 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
532 if (i->multiaddr==addr) {
533 if (--i->users == 0) {
534 write_lock_bh(&in_dev->lock);
535 *ip = i->next;
536 write_unlock_bh(&in_dev->lock);
537 igmp_group_dropped(i);
538
539 if (in_dev->dev->flags & IFF_UP)
540 ip_rt_multicast_event(in_dev);
541
542 ip_ma_put(i);
543 return 0;
544 }
545 err = 0;
546 break;
547 }
548 }
549 return -ESRCH;
550 }
551
552 /* Device going down */
553
554 void ip_mc_down(struct in_device *in_dev)
555 {
556 struct ip_mc_list *i;
557
558 ASSERT_RTNL();
559
560 for (i=in_dev->mc_list; i; i=i->next)
561 igmp_group_dropped(i);
562
563 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
564 }
565
566 /* Device going up */
567
568 void ip_mc_up(struct in_device *in_dev)
569 {
570 struct ip_mc_list *i;
571
572 ASSERT_RTNL();
573
574 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
575
576 for (i=in_dev->mc_list; i; i=i->next)
577 igmp_group_added(i);
578 }
579
580 /*
581 * Device is about to be destroyed: clean up.
582 */
583
584 void ip_mc_destroy_dev(struct in_device *in_dev)
585 {
586 struct ip_mc_list *i;
587
588 ASSERT_RTNL();
589
590 write_lock_bh(&in_dev->lock);
591 while ((i = in_dev->mc_list) != NULL) {
592 in_dev->mc_list = i->next;
593 write_unlock_bh(&in_dev->lock);
594
595 igmp_group_dropped(i);
596 ip_ma_put(i);
597
598 write_lock_bh(&in_dev->lock);
599 }
600 write_unlock_bh(&in_dev->lock);
601 }
602
603 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
604 {
605 struct rtable *rt;
606 struct net_device *dev = NULL;
607 struct in_device *idev = NULL;
608
609 if (imr->imr_address.s_addr) {
610 dev = ip_dev_find(imr->imr_address.s_addr);
611 if (!dev)
612 return NULL;
613 __dev_put(dev);
614 }
615
616 if (!dev && !ip_route_output(&rt, imr->imr_multiaddr.s_addr, 0, 0, 0)) {
617 dev = rt->u.dst.dev;
618 ip_rt_put(rt);
619 }
620 if (dev) {
621 imr->imr_ifindex = dev->ifindex;
622 idev = __in_dev_get(dev);
623 }
624 return idev;
625 }
626
627 /*
628 * Join a socket to a group
629 */
630 int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS;
631
632 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
633 {
634 int err;
635 u32 addr = imr->imr_multiaddr.s_addr;
636 struct ip_mc_socklist *iml, *i;
637 struct in_device *in_dev;
638 int count = 0;
639
640 if (!MULTICAST(addr))
641 return -EINVAL;
642
643 rtnl_shlock();
644
645 if (!imr->imr_ifindex)
646 in_dev = ip_mc_find_dev(imr);
647 else {
648 in_dev = inetdev_by_index(imr->imr_ifindex);
649 if (in_dev)
650 __in_dev_put(in_dev);
651 }
652
653 if (!in_dev) {
654 iml = NULL;
655 err = -ENODEV;
656 goto done;
657 }
658
659 iml = (struct ip_mc_socklist *)sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
660
661 err = -EADDRINUSE;
662 for (i=sk->protinfo.af_inet.mc_list; i; i=i->next) {
663 if (memcmp(&i->multi, imr, sizeof(*imr)) == 0) {
664 /* New style additions are reference counted */
665 if (imr->imr_address.s_addr == 0) {
666 i->count++;
667 err = 0;
668 }
669 goto done;
670 }
671 count++;
672 }
673 err = -ENOBUFS;
674 if (iml == NULL || count >= sysctl_igmp_max_memberships)
675 goto done;
676 memcpy(&iml->multi, imr, sizeof(*imr));
677 iml->next = sk->protinfo.af_inet.mc_list;
678 iml->count = 1;
679 sk->protinfo.af_inet.mc_list = iml;
680 ip_mc_inc_group(in_dev, addr);
681 iml = NULL;
682 err = 0;
683
684 done:
685 rtnl_shunlock();
686 if (iml)
687 sock_kfree_s(sk, iml, sizeof(*iml));
688 return err;
689 }
690
691 /*
692 * Ask a socket to leave a group.
693 */
694
695 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
696 {
697 struct ip_mc_socklist *iml, **imlp;
698
699 rtnl_lock();
700 for (imlp=&sk->protinfo.af_inet.mc_list; (iml=*imlp)!=NULL; imlp=&iml->next) {
701 if (iml->multi.imr_multiaddr.s_addr==imr->imr_multiaddr.s_addr &&
702 iml->multi.imr_address.s_addr==imr->imr_address.s_addr &&
703 (!imr->imr_ifindex || iml->multi.imr_ifindex==imr->imr_ifindex)) {
704 struct in_device *in_dev;
705 if (--iml->count) {
706 rtnl_unlock();
707 return 0;
708 }
709
710 *imlp = iml->next;
711
712 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
713 if (in_dev) {
714 ip_mc_dec_group(in_dev, imr->imr_multiaddr.s_addr);
715 in_dev_put(in_dev);
716 }
717 rtnl_unlock();
718 sock_kfree_s(sk, iml, sizeof(*iml));
719 return 0;
720 }
721 }
722 rtnl_unlock();
723 return -EADDRNOTAVAIL;
724 }
725
726 /*
727 * A socket is closing.
728 */
729
730 void ip_mc_drop_socket(struct sock *sk)
731 {
732 struct ip_mc_socklist *iml;
733
734 if (sk->protinfo.af_inet.mc_list == NULL)
735 return;
736
737 rtnl_lock();
738 while ((iml=sk->protinfo.af_inet.mc_list) != NULL) {
739 struct in_device *in_dev;
740 sk->protinfo.af_inet.mc_list = iml->next;
741
742 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) {
743 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
744 in_dev_put(in_dev);
745 }
746 sock_kfree_s(sk, iml, sizeof(*iml));
747
748 }
749 rtnl_unlock();
750 }
751
752 int ip_check_mc(struct in_device *in_dev, u32 mc_addr)
753 {
754 struct ip_mc_list *im;
755
756 read_lock(&in_dev->lock);
757 for (im=in_dev->mc_list; im; im=im->next) {
758 if (im->multiaddr == mc_addr) {
759 read_unlock(&in_dev->lock);
760 return 1;
761 }
762 }
763 read_unlock(&in_dev->lock);
764 return 0;
765 }
766
767
768 #ifdef CONFIG_IP_MULTICAST
769
770 int ip_mc_procinfo(char *buffer, char **start, off_t offset, int length)
771 {
772 off_t pos=0, begin=0;
773 struct ip_mc_list *im;
774 int len=0;
775 struct net_device *dev;
776
777 len=sprintf(buffer,"Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
778
779 read_lock(&dev_base_lock);
780 for(dev = dev_base; dev; dev = dev->next) {
781 struct in_device *in_dev = in_dev_get(dev);
782 char *querier = "NONE";
783
784 if (in_dev == NULL)
785 continue;
786
787 querier = IGMP_V1_SEEN(in_dev) ? "V1" : "V2";
788
789 len+=sprintf(buffer+len,"%d\t%-10s: %5d %7s\n",
790 dev->ifindex, dev->name, dev->mc_count, querier);
791
792 read_lock(&in_dev->lock);
793 for (im = in_dev->mc_list; im; im = im->next) {
794 len+=sprintf(buffer+len,
795 "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n",
796 im->multiaddr, im->users,
797 im->tm_running, im->timer.expires-jiffies, im->reporter);
798
799 pos=begin+len;
800 if(pos<offset)
801 {
802 len=0;
803 begin=pos;
804 }
805 if(pos>offset+length) {
806 read_unlock(&in_dev->lock);
807 in_dev_put(in_dev);
808 goto done;
809 }
810 }
811 read_unlock(&in_dev->lock);
812 in_dev_put(in_dev);
813 }
814 done:
815 read_unlock(&dev_base_lock);
816
817 *start=buffer+(offset-begin);
818 len-=(offset-begin);
819 if(len>length)
820 len=length;
821 if(len<0)
822 len=0;
823 return len;
824 }
825 #endif
826
827
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