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[net-next-2.6.git] / net / ipv4 / igmp.c
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1da177e4
LT		 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 1.47 2002/02/01 22:01:03 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 * David L Stevens: IGMPv3 support, with help from
72 * Vinay Kulkarni
73 */
74
75#include <linux/config.h>
76#include <linux/module.h>
77#include <asm/uaccess.h>
78#include <asm/system.h>
79#include <linux/types.h>
80#include <linux/kernel.h>
81#include <linux/jiffies.h>
82#include <linux/string.h>
83#include <linux/socket.h>
84#include <linux/sockios.h>
85#include <linux/in.h>
86#include <linux/inet.h>
87#include <linux/netdevice.h>
88#include <linux/skbuff.h>
89#include <linux/inetdevice.h>
90#include <linux/igmp.h>
91#include <linux/if_arp.h>
92#include <linux/rtnetlink.h>
93#include <linux/times.h>
14c85021
ACM		 94
95#include <net/arp.h>
1da177e4
LT		 96#include <net/ip.h>
97#include <net/protocol.h>
98#include <net/route.h>
99#include <net/sock.h>
100#include <net/checksum.h>
101#include <linux/netfilter_ipv4.h>
102#ifdef CONFIG_IP_MROUTE
103#include <linux/mroute.h>
104#endif
105#ifdef CONFIG_PROC_FS
106#include <linux/proc_fs.h>
107#include <linux/seq_file.h>
108#endif
109
110#define IP_MAX_MEMBERSHIPS 20
111#define IP_MAX_MSF 10
112
113#ifdef CONFIG_IP_MULTICAST
114/* Parameter names and values are taken from igmp-v2-06 draft */
115
116#define IGMP_V1_Router_Present_Timeout (400*HZ)
117#define IGMP_V2_Router_Present_Timeout (400*HZ)
118#define IGMP_Unsolicited_Report_Interval (10*HZ)
119#define IGMP_Query_Response_Interval (10*HZ)
120#define IGMP_Unsolicited_Report_Count 2
121
122
123#define IGMP_Initial_Report_Delay (1)
124
125/* IGMP_Initial_Report_Delay is not from IGMP specs!
126 * IGMP specs require to report membership immediately after
127 * joining a group, but we delay the first report by a
128 * small interval. It seems more natural and still does not
129 * contradict to specs provided this delay is small enough.
130 */
131
132#define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \
133 (in_dev)->cnf.force_igmp_version == 1 || \
134 ((in_dev)->mr_v1_seen && \
135 time_before(jiffies, (in_dev)->mr_v1_seen)))
136#define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \
137 (in_dev)->cnf.force_igmp_version == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
140
141static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
142static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr);
143static void igmpv3_clear_delrec(struct in_device *in_dev);
144static int sf_setstate(struct ip_mc_list *pmc);
145static void sf_markstate(struct ip_mc_list *pmc);
146#endif
147static void ip_mc_clear_src(struct ip_mc_list *pmc);
148static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
149 int sfcount, __u32 *psfsrc, int delta);
150
151static void ip_ma_put(struct ip_mc_list *im)
152{
153 if (atomic_dec_and_test(&im->refcnt)) {
154 in_dev_put(im->interface);
155 kfree(im);
156 }
157}
158
159#ifdef CONFIG_IP_MULTICAST
160
161/*
162 * Timer management
163 */
164
165static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
166{
167 spin_lock_bh(&im->lock);
168 if (del_timer(&im->timer))
169 atomic_dec(&im->refcnt);
170 im->tm_running=0;
171 im->reporter = 0;
172 im->unsolicit_count = 0;
173 spin_unlock_bh(&im->lock);
174}
175
176/* It must be called with locked im->lock */
177static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
178{
179 int tv=net_random() % max_delay;
180
181 im->tm_running=1;
182 if (!mod_timer(&im->timer, jiffies+tv+2))
183 atomic_inc(&im->refcnt);
184}
185
186static void igmp_gq_start_timer(struct in_device *in_dev)
187{
188 int tv = net_random() % in_dev->mr_maxdelay;
189
190 in_dev->mr_gq_running = 1;
191 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
192 in_dev_hold(in_dev);
193}
194
195static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
196{
197 int tv = net_random() % delay;
198
199 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
200 in_dev_hold(in_dev);
201}
202
203static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
204{
205 spin_lock_bh(&im->lock);
206 im->unsolicit_count = 0;
207 if (del_timer(&im->timer)) {
208 if ((long)(im->timer.expires-jiffies) < max_delay) {
209 add_timer(&im->timer);
210 im->tm_running=1;
211 spin_unlock_bh(&im->lock);
212 return;
213 }
214 atomic_dec(&im->refcnt);
215 }
216 igmp_start_timer(im, max_delay);
217 spin_unlock_bh(&im->lock);
218}
219
220
221/*
222 * Send an IGMP report.
223 */
224
225#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
226
227
228static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
229 int gdeleted, int sdeleted)
230{
231 switch (type) {
232 case IGMPV3_MODE_IS_INCLUDE:
233 case IGMPV3_MODE_IS_EXCLUDE:
234 if (gdeleted || sdeleted)
235 return 0;
236 return !(pmc->gsquery && !psf->sf_gsresp);
237 case IGMPV3_CHANGE_TO_INCLUDE:
238 if (gdeleted || sdeleted)
239 return 0;
240 return psf->sf_count[MCAST_INCLUDE] != 0;
241 case IGMPV3_CHANGE_TO_EXCLUDE:
242 if (gdeleted || sdeleted)
243 return 0;
244 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
245 psf->sf_count[MCAST_INCLUDE])
246 return 0;
247 return pmc->sfcount[MCAST_EXCLUDE] ==
248 psf->sf_count[MCAST_EXCLUDE];
249 case IGMPV3_ALLOW_NEW_SOURCES:
250 if (gdeleted || !psf->sf_crcount)
251 return 0;
252 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
253 case IGMPV3_BLOCK_OLD_SOURCES:
254 if (pmc->sfmode == MCAST_INCLUDE)
255 return gdeleted || (psf->sf_crcount && sdeleted);
256 return psf->sf_crcount && !gdeleted && !sdeleted;
257 }
258 return 0;
259}
260
261static int
262igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
263{
264 struct ip_sf_list *psf;
265 int scount = 0;
266
267 for (psf=pmc->sources; psf; psf=psf->sf_next) {
268 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
269 continue;
270 scount++;
271 }
272 return scount;
273}
274
275static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
276{
277 struct sk_buff *skb;
278 struct rtable *rt;
279 struct iphdr *pip;
280 struct igmpv3_report *pig;
281
282 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
283 if (skb == NULL)
284 return NULL;
285
286 {
287 struct flowi fl = { .oif = dev->ifindex,
288 .nl_u = { .ip4_u = {
289 .daddr = IGMPV3_ALL_MCR } },
290 .proto = IPPROTO_IGMP };
291 if (ip_route_output_key(&rt, &fl)) {
292 kfree_skb(skb);
293 return NULL;
294 }
295 }
296 if (rt->rt_src == 0) {
297 kfree_skb(skb);
298 ip_rt_put(rt);
299 return NULL;
300 }
301
302 skb->dst = &rt->u.dst;
303 skb->dev = dev;
304
305 skb_reserve(skb, LL_RESERVED_SPACE(dev));
306
307 skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
308
309 pip->version = 4;
310 pip->ihl = (sizeof(struct iphdr)+4)>>2;
311 pip->tos = 0xc0;
312 pip->frag_off = htons(IP_DF);
313 pip->ttl = 1;
314 pip->daddr = rt->rt_dst;
315 pip->saddr = rt->rt_src;
316 pip->protocol = IPPROTO_IGMP;
317 pip->tot_len = 0; /* filled in later */
318 ip_select_ident(pip, &rt->u.dst, NULL);
319 ((u8*)&pip[1])[0] = IPOPT_RA;
320 ((u8*)&pip[1])[1] = 4;
321 ((u8*)&pip[1])[2] = 0;
322 ((u8*)&pip[1])[3] = 0;
323
324 pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig));
325 skb->h.igmph = (struct igmphdr *)pig;
326 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
327 pig->resv1 = 0;
328 pig->csum = 0;
329 pig->resv2 = 0;
330 pig->ngrec = 0;
331 return skb;
332}
333
334static int igmpv3_sendpack(struct sk_buff *skb)
335{
336 struct iphdr *pip = skb->nh.iph;
337 struct igmphdr *pig = skb->h.igmph;
338 int iplen, igmplen;
339
340 iplen = skb->tail - (unsigned char *)skb->nh.iph;
341 pip->tot_len = htons(iplen);
342 ip_send_check(pip);
343
344 igmplen = skb->tail - (unsigned char *)skb->h.igmph;
345 pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen);
346
347 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
348 dst_output);
349}
350
351static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
352{
353 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
354}
355
356static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
357 int type, struct igmpv3_grec **ppgr)
358{
359 struct net_device *dev = pmc->interface->dev;
360 struct igmpv3_report *pih;
361 struct igmpv3_grec *pgr;
362
363 if (!skb)
364 skb = igmpv3_newpack(dev, dev->mtu);
365 if (!skb)
366 return NULL;
367 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
368 pgr->grec_type = type;
369 pgr->grec_auxwords = 0;
370 pgr->grec_nsrcs = 0;
371 pgr->grec_mca = pmc->multiaddr;
372 pih = (struct igmpv3_report *)skb->h.igmph;
373 pih->ngrec = htons(ntohs(pih->ngrec)+1);
374 *ppgr = pgr;
375 return skb;
376}
377
378#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
379 skb_tailroom(skb)) : 0)
380
381static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
382 int type, int gdeleted, int sdeleted)
383{
384 struct net_device *dev = pmc->interface->dev;
385 struct igmpv3_report *pih;
386 struct igmpv3_grec *pgr = NULL;
387 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
388 int scount, first, isquery, truncate;
389
390 if (pmc->multiaddr == IGMP_ALL_HOSTS)
391 return skb;
392
393 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
394 type == IGMPV3_MODE_IS_EXCLUDE;
395 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
396 type == IGMPV3_CHANGE_TO_EXCLUDE;
397
398 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
399
400 if (!*psf_list) {
401 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
402 type == IGMPV3_BLOCK_OLD_SOURCES)
403 return skb;
404 if (pmc->crcount || isquery) {
405 /* make sure we have room for group header and at
406 * least one source.
407 */
408 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)+
409 sizeof(__u32)) {
410 igmpv3_sendpack(skb);
411 skb = NULL; /* add_grhead will get a new one */
412 }
413 skb = add_grhead(skb, pmc, type, &pgr);
414 }
415 return skb;
416 }
417 pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL;
418
419 /* EX and TO_EX get a fresh packet, if needed */
420 if (truncate) {
421 if (pih && pih->ngrec &&
422 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
423 if (skb)
424 igmpv3_sendpack(skb);
425 skb = igmpv3_newpack(dev, dev->mtu);
426 }
427 }
428 first = 1;
429 scount = 0;
430 psf_prev = NULL;
431 for (psf=*psf_list; psf; psf=psf_next) {
432 u32 *psrc;
433
434 psf_next = psf->sf_next;
435
436 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
437 psf_prev = psf;
438 continue;
439 }
440
441 /* clear marks on query responses */
442 if (isquery)
443 psf->sf_gsresp = 0;
444
445 if (AVAILABLE(skb) < sizeof(u32) +
446 first*sizeof(struct igmpv3_grec)) {
447 if (truncate && !first)
448 break; /* truncate these */
449 if (pgr)
450 pgr->grec_nsrcs = htons(scount);
451 if (skb)
452 igmpv3_sendpack(skb);
453 skb = igmpv3_newpack(dev, dev->mtu);
454 first = 1;
455 scount = 0;
456 }
457 if (first) {
458 skb = add_grhead(skb, pmc, type, &pgr);
459 first = 0;
460 }
461 psrc = (u32 *)skb_put(skb, sizeof(u32));
462 *psrc = psf->sf_inaddr;
463 scount++;
464 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
465 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
466 psf->sf_crcount--;
467 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
468 if (psf_prev)
469 psf_prev->sf_next = psf->sf_next;
470 else
471 *psf_list = psf->sf_next;
472 kfree(psf);
473 continue;
474 }
475 }
476 psf_prev = psf;
477 }
478 if (pgr)
479 pgr->grec_nsrcs = htons(scount);
480
481 if (isquery)
482 pmc->gsquery = 0; /* clear query state on report */
483 return skb;
484}
485
486static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
487{
488 struct sk_buff *skb = NULL;
489 int type;
490
491 if (!pmc) {
492 read_lock(&in_dev->mc_list_lock);
493 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
494 if (pmc->multiaddr == IGMP_ALL_HOSTS)
495 continue;
496 spin_lock_bh(&pmc->lock);
497 if (pmc->sfcount[MCAST_EXCLUDE])
498 type = IGMPV3_MODE_IS_EXCLUDE;
499 else
500 type = IGMPV3_MODE_IS_INCLUDE;
501 skb = add_grec(skb, pmc, type, 0, 0);
502 spin_unlock_bh(&pmc->lock);
503 }
504 read_unlock(&in_dev->mc_list_lock);
505 } else {
506 spin_lock_bh(&pmc->lock);
507 if (pmc->sfcount[MCAST_EXCLUDE])
508 type = IGMPV3_MODE_IS_EXCLUDE;
509 else
510 type = IGMPV3_MODE_IS_INCLUDE;
511 skb = add_grec(skb, pmc, type, 0, 0);
512 spin_unlock_bh(&pmc->lock);
513 }
514 if (!skb)
515 return 0;
516 return igmpv3_sendpack(skb);
517}
518
519/*
520 * remove zero-count source records from a source filter list
521 */
522static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
523{
524 struct ip_sf_list *psf_prev, *psf_next, *psf;
525
526 psf_prev = NULL;
527 for (psf=*ppsf; psf; psf = psf_next) {
528 psf_next = psf->sf_next;
529 if (psf->sf_crcount == 0) {
530 if (psf_prev)
531 psf_prev->sf_next = psf->sf_next;
532 else
533 *ppsf = psf->sf_next;
534 kfree(psf);
535 } else
536 psf_prev = psf;
537 }
538}
539
540static void igmpv3_send_cr(struct in_device *in_dev)
541{
542 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
543 struct sk_buff *skb = NULL;
544 int type, dtype;
545
546 read_lock(&in_dev->mc_list_lock);
547 spin_lock_bh(&in_dev->mc_tomb_lock);
548
549 /* deleted MCA's */
550 pmc_prev = NULL;
551 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
552 pmc_next = pmc->next;
553 if (pmc->sfmode == MCAST_INCLUDE) {
554 type = IGMPV3_BLOCK_OLD_SOURCES;
555 dtype = IGMPV3_BLOCK_OLD_SOURCES;
556 skb = add_grec(skb, pmc, type, 1, 0);
557 skb = add_grec(skb, pmc, dtype, 1, 1);
558 }
559 if (pmc->crcount) {
560 pmc->crcount--;
561 if (pmc->sfmode == MCAST_EXCLUDE) {
562 type = IGMPV3_CHANGE_TO_INCLUDE;
563 skb = add_grec(skb, pmc, type, 1, 0);
564 }
565 if (pmc->crcount == 0) {
566 igmpv3_clear_zeros(&pmc->tomb);
567 igmpv3_clear_zeros(&pmc->sources);
568 }
569 }
570 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
571 if (pmc_prev)
572 pmc_prev->next = pmc_next;
573 else
574 in_dev->mc_tomb = pmc_next;
575 in_dev_put(pmc->interface);
576 kfree(pmc);
577 } else
578 pmc_prev = pmc;
579 }
580 spin_unlock_bh(&in_dev->mc_tomb_lock);
581
582 /* change recs */
583 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
584 spin_lock_bh(&pmc->lock);
585 if (pmc->sfcount[MCAST_EXCLUDE]) {
586 type = IGMPV3_BLOCK_OLD_SOURCES;
587 dtype = IGMPV3_ALLOW_NEW_SOURCES;
588 } else {
589 type = IGMPV3_ALLOW_NEW_SOURCES;
590 dtype = IGMPV3_BLOCK_OLD_SOURCES;
591 }
592 skb = add_grec(skb, pmc, type, 0, 0);
593 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
594
595 /* filter mode changes */
596 if (pmc->crcount) {
597 pmc->crcount--;
598 if (pmc->sfmode == MCAST_EXCLUDE)
599 type = IGMPV3_CHANGE_TO_EXCLUDE;
600 else
601 type = IGMPV3_CHANGE_TO_INCLUDE;
602 skb = add_grec(skb, pmc, type, 0, 0);
603 }
604 spin_unlock_bh(&pmc->lock);
605 }
606 read_unlock(&in_dev->mc_list_lock);
607
608 if (!skb)
609 return;
610 (void) igmpv3_sendpack(skb);
611}
612
613static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
614 int type)
615{
616 struct sk_buff *skb;
617 struct iphdr *iph;
618 struct igmphdr *ih;
619 struct rtable *rt;
620 struct net_device *dev = in_dev->dev;
621 u32 group = pmc ? pmc->multiaddr : 0;
622 u32 dst;
623
624 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
625 return igmpv3_send_report(in_dev, pmc);
626 else if (type == IGMP_HOST_LEAVE_MESSAGE)
627 dst = IGMP_ALL_ROUTER;
628 else
629 dst = group;
630
631 {
632 struct flowi fl = { .oif = dev->ifindex,
633 .nl_u = { .ip4_u = { .daddr = dst } },
634 .proto = IPPROTO_IGMP };
635 if (ip_route_output_key(&rt, &fl))
636 return -1;
637 }
638 if (rt->rt_src == 0) {
639 ip_rt_put(rt);
640 return -1;
641 }
642
643 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
644 if (skb == NULL) {
645 ip_rt_put(rt);
646 return -1;
647 }
648
649 skb->dst = &rt->u.dst;
650
651 skb_reserve(skb, LL_RESERVED_SPACE(dev));
652
653 skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
654
655 iph->version = 4;
656 iph->ihl = (sizeof(struct iphdr)+4)>>2;
657 iph->tos = 0xc0;
658 iph->frag_off = htons(IP_DF);
659 iph->ttl = 1;
660 iph->daddr = dst;
661 iph->saddr = rt->rt_src;
662 iph->protocol = IPPROTO_IGMP;
663 iph->tot_len = htons(IGMP_SIZE);
664 ip_select_ident(iph, &rt->u.dst, NULL);
665 ((u8*)&iph[1])[0] = IPOPT_RA;
666 ((u8*)&iph[1])[1] = 4;
667 ((u8*)&iph[1])[2] = 0;
668 ((u8*)&iph[1])[3] = 0;
669 ip_send_check(iph);
670
671 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
672 ih->type=type;
673 ih->code=0;
674 ih->csum=0;
675 ih->group=group;
676 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
677
678 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
679 dst_output);
680}
681
682static void igmp_gq_timer_expire(unsigned long data)
683{
684 struct in_device *in_dev = (struct in_device *)data;
685
686 in_dev->mr_gq_running = 0;
687 igmpv3_send_report(in_dev, NULL);
688 __in_dev_put(in_dev);
689}
690
691static void igmp_ifc_timer_expire(unsigned long data)
692{
693 struct in_device *in_dev = (struct in_device *)data;
694
695 igmpv3_send_cr(in_dev);
696 if (in_dev->mr_ifc_count) {
697 in_dev->mr_ifc_count--;
698 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
699 }
700 __in_dev_put(in_dev);
701}
702
703static void igmp_ifc_event(struct in_device *in_dev)
704{
705 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
706 return;
707 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
708 IGMP_Unsolicited_Report_Count;
709 igmp_ifc_start_timer(in_dev, 1);
710}
711
712
713static void igmp_timer_expire(unsigned long data)
714{
715 struct ip_mc_list *im=(struct ip_mc_list *)data;
716 struct in_device *in_dev = im->interface;
717
718 spin_lock(&im->lock);
719 im->tm_running=0;
720
721 if (im->unsolicit_count) {
722 im->unsolicit_count--;
723 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
724 }
725 im->reporter = 1;
726 spin_unlock(&im->lock);
727
728 if (IGMP_V1_SEEN(in_dev))
729 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
730 else if (IGMP_V2_SEEN(in_dev))
731 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
732 else
733 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
734
735 ip_ma_put(im);
736}
737
738static void igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs)
739{
740 struct ip_sf_list *psf;
741 int i, scount;
742
743 scount = 0;
744 for (psf=pmc->sources; psf; psf=psf->sf_next) {
745 if (scount == nsrcs)
746 break;
747 for (i=0; i<nsrcs; i++)
748 if (srcs[i] == psf->sf_inaddr) {
749 psf->sf_gsresp = 1;
750 scount++;
751 break;
752 }
753 }
754}
755
756static void igmp_heard_report(struct in_device *in_dev, u32 group)
757{
758 struct ip_mc_list *im;
759
760 /* Timers are only set for non-local groups */
761
762 if (group == IGMP_ALL_HOSTS)
763 return;
764
765 read_lock(&in_dev->mc_list_lock);
766 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
767 if (im->multiaddr == group) {
768 igmp_stop_timer(im);
769 break;
770 }
771 }
772 read_unlock(&in_dev->mc_list_lock);
773}
774
775static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
776 int len)
777{
778 struct igmphdr *ih = skb->h.igmph;
779 struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
780 struct ip_mc_list *im;
781 u32 group = ih->group;
782 int max_delay;
783 int mark = 0;
784
785
786 if (len == 8) {
787 if (ih->code == 0) {
788 /* Alas, old v1 router presents here. */
789
790 max_delay = IGMP_Query_Response_Interval;
791 in_dev->mr_v1_seen = jiffies +
792 IGMP_V1_Router_Present_Timeout;
793 group = 0;
794 } else {
795 /* v2 router present */
796 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
797 in_dev->mr_v2_seen = jiffies +
798 IGMP_V2_Router_Present_Timeout;
799 }
800 /* cancel the interface change timer */
801 in_dev->mr_ifc_count = 0;
802 if (del_timer(&in_dev->mr_ifc_timer))
803 __in_dev_put(in_dev);
804 /* clear deleted report items */
805 igmpv3_clear_delrec(in_dev);
806 } else if (len < 12) {
807 return; /* ignore bogus packet; freed by caller */
808 } else { /* v3 */
809 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
810 return;
811
812 ih3 = (struct igmpv3_query *) skb->h.raw;
813 if (ih3->nsrcs) {
814 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
815 + ntohs(ih3->nsrcs)*sizeof(__u32)))
816 return;
817 ih3 = (struct igmpv3_query *) skb->h.raw;
818 }
819
820 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
821 if (!max_delay)
822 max_delay = 1; /* can't mod w/ 0 */
823 in_dev->mr_maxdelay = max_delay;
824 if (ih3->qrv)
825 in_dev->mr_qrv = ih3->qrv;
826 if (!group) { /* general query */
827 if (ih3->nsrcs)
828 return; /* no sources allowed */
829 igmp_gq_start_timer(in_dev);
830 return;
831 }
832 /* mark sources to include, if group & source-specific */
833 mark = ih3->nsrcs != 0;
834 }
835
836 /*
837 * - Start the timers in all of our membership records
838 * that the query applies to for the interface on
839 * which the query arrived excl. those that belong
840 * to a "local" group (224.0.0.X)
841 * - For timers already running check if they need to
842 * be reset.
843 * - Use the igmp->igmp_code field as the maximum
844 * delay possible
845 */
846 read_lock(&in_dev->mc_list_lock);
847 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
848 if (group && group != im->multiaddr)
849 continue;
850 if (im->multiaddr == IGMP_ALL_HOSTS)
851 continue;
852 spin_lock_bh(&im->lock);
853 if (im->tm_running)
854 im->gsquery = im->gsquery && mark;
855 else
856 im->gsquery = mark;
857 if (im->gsquery)
858 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
859 spin_unlock_bh(&im->lock);
860 igmp_mod_timer(im, max_delay);
861 }
862 read_unlock(&in_dev->mc_list_lock);
863}
864
865int igmp_rcv(struct sk_buff *skb)
866{
867 /* This basically follows the spec line by line -- see RFC1112 */
868 struct igmphdr *ih;
869 struct in_device *in_dev = in_dev_get(skb->dev);
870 int len = skb->len;
871
872 if (in_dev==NULL) {
873 kfree_skb(skb);
874 return 0;
875 }
876
fb286bb2
HX		 877 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
878 goto drop;
879
880 switch (skb->ip_summed) {
881 case CHECKSUM_HW:
882 if (!(u16)csum_fold(skb->csum))
883 break;
884 /* fall through */
885 case CHECKSUM_NONE:
886 skb->csum = 0;
887 if (__skb_checksum_complete(skb))
888 goto drop;
1da177e4
LT		 889 }
890
891 ih = skb->h.igmph;
892 switch (ih->type) {
893 case IGMP_HOST_MEMBERSHIP_QUERY:
894 igmp_heard_query(in_dev, skb, len);
895 break;
896 case IGMP_HOST_MEMBERSHIP_REPORT:
897 case IGMPV2_HOST_MEMBERSHIP_REPORT:
898 case IGMPV3_HOST_MEMBERSHIP_REPORT:
899 /* Is it our report looped back? */
900 if (((struct rtable*)skb->dst)->fl.iif == 0)
901 break;
24c69275
DS		 902 /* don't rely on MC router hearing unicast reports */
903 if (skb->pkt_type == PACKET_MULTICAST ||
904 skb->pkt_type == PACKET_BROADCAST)
905 igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 906 break;
907 case IGMP_PIM:
908#ifdef CONFIG_IP_PIMSM_V1
909 in_dev_put(in_dev);
910 return pim_rcv_v1(skb);
911#endif
912 case IGMP_DVMRP:
913 case IGMP_TRACE:
914 case IGMP_HOST_LEAVE_MESSAGE:
915 case IGMP_MTRACE:
916 case IGMP_MTRACE_RESP:
917 break;
918 default:
64ce2073 919 NETDEBUG(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type);
1da177e4 920 }
fb286bb2
HX		 921
922drop:
1da177e4
LT		 923 in_dev_put(in_dev);
924 kfree_skb(skb);
925 return 0;
926}
927
928#endif
929
930
931/*
932 * Add a filter to a device
933 */
934
935static void ip_mc_filter_add(struct in_device *in_dev, u32 addr)
936{
937 char buf[MAX_ADDR_LEN];
938 struct net_device *dev = in_dev->dev;
939
940 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
941 We will get multicast token leakage, when IFF_MULTICAST
942 is changed. This check should be done in dev->set_multicast_list
943 routine. Something sort of:
944 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
945 --ANK
946 */
947 if (arp_mc_map(addr, buf, dev, 0) == 0)
948 dev_mc_add(dev,buf,dev->addr_len,0);
949}
950
951/*
952 * Remove a filter from a device
953 */
954
955static void ip_mc_filter_del(struct in_device *in_dev, u32 addr)
956{
957 char buf[MAX_ADDR_LEN];
958 struct net_device *dev = in_dev->dev;
959
960 if (arp_mc_map(addr, buf, dev, 0) == 0)
961 dev_mc_delete(dev,buf,dev->addr_len,0);
962}
963
964#ifdef CONFIG_IP_MULTICAST
965/*
966 * deleted ip_mc_list manipulation
967 */
968static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
969{
970 struct ip_mc_list *pmc;
971
972 /* this is an "ip_mc_list" for convenience; only the fields below
973 * are actually used. In particular, the refcnt and users are not
974 * used for management of the delete list. Using the same structure
975 * for deleted items allows change reports to use common code with
976 * non-deleted or query-response MCA's.
977 */
8b3a7005 978 pmc = kmalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 979 if (!pmc)
980 return;
981 memset(pmc, 0, sizeof(*pmc));
982 spin_lock_bh(&im->lock);
983 pmc->interface = im->interface;
984 in_dev_hold(in_dev);
985 pmc->multiaddr = im->multiaddr;
986 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
987 IGMP_Unsolicited_Report_Count;
988 pmc->sfmode = im->sfmode;
989 if (pmc->sfmode == MCAST_INCLUDE) {
990 struct ip_sf_list *psf;
991
992 pmc->tomb = im->tomb;
993 pmc->sources = im->sources;
994 im->tomb = im->sources = NULL;
995 for (psf=pmc->sources; psf; psf=psf->sf_next)
996 psf->sf_crcount = pmc->crcount;
997 }
998 spin_unlock_bh(&im->lock);
999
1000 spin_lock_bh(&in_dev->mc_tomb_lock);
1001 pmc->next = in_dev->mc_tomb;
1002 in_dev->mc_tomb = pmc;
1003 spin_unlock_bh(&in_dev->mc_tomb_lock);
1004}
1005
1006static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr)
1007{
1008 struct ip_mc_list *pmc, *pmc_prev;
1009 struct ip_sf_list *psf, *psf_next;
1010
1011 spin_lock_bh(&in_dev->mc_tomb_lock);
1012 pmc_prev = NULL;
1013 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1014 if (pmc->multiaddr == multiaddr)
1015 break;
1016 pmc_prev = pmc;
1017 }
1018 if (pmc) {
1019 if (pmc_prev)
1020 pmc_prev->next = pmc->next;
1021 else
1022 in_dev->mc_tomb = pmc->next;
1023 }
1024 spin_unlock_bh(&in_dev->mc_tomb_lock);
1025 if (pmc) {
1026 for (psf=pmc->tomb; psf; psf=psf_next) {
1027 psf_next = psf->sf_next;
1028 kfree(psf);
1029 }
1030 in_dev_put(pmc->interface);
1031 kfree(pmc);
1032 }
1033}
1034
1035static void igmpv3_clear_delrec(struct in_device *in_dev)
1036{
1037 struct ip_mc_list *pmc, *nextpmc;
1038
1039 spin_lock_bh(&in_dev->mc_tomb_lock);
1040 pmc = in_dev->mc_tomb;
1041 in_dev->mc_tomb = NULL;
1042 spin_unlock_bh(&in_dev->mc_tomb_lock);
1043
1044 for (; pmc; pmc = nextpmc) {
1045 nextpmc = pmc->next;
1046 ip_mc_clear_src(pmc);
1047 in_dev_put(pmc->interface);
1048 kfree(pmc);
1049 }
1050 /* clear dead sources, too */
1051 read_lock(&in_dev->mc_list_lock);
1052 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1053 struct ip_sf_list *psf, *psf_next;
1054
1055 spin_lock_bh(&pmc->lock);
1056 psf = pmc->tomb;
1057 pmc->tomb = NULL;
1058 spin_unlock_bh(&pmc->lock);
1059 for (; psf; psf=psf_next) {
1060 psf_next = psf->sf_next;
1061 kfree(psf);
1062 }
1063 }
1064 read_unlock(&in_dev->mc_list_lock);
1065}
1066#endif
1067
1068static void igmp_group_dropped(struct ip_mc_list *im)
1069{
1070 struct in_device *in_dev = im->interface;
1071#ifdef CONFIG_IP_MULTICAST
1072 int reporter;
1073#endif
1074
1075 if (im->loaded) {
1076 im->loaded = 0;
1077 ip_mc_filter_del(in_dev, im->multiaddr);
1078 }
1079
1080#ifdef CONFIG_IP_MULTICAST
1081 if (im->multiaddr == IGMP_ALL_HOSTS)
1082 return;
1083
1084 reporter = im->reporter;
1085 igmp_stop_timer(im);
1086
1087 if (!in_dev->dead) {
1088 if (IGMP_V1_SEEN(in_dev))
1089 goto done;
1090 if (IGMP_V2_SEEN(in_dev)) {
1091 if (reporter)
1092 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1093 goto done;
1094 }
1095 /* IGMPv3 */
1096 igmpv3_add_delrec(in_dev, im);
1097
1098 igmp_ifc_event(in_dev);
1099 }
1100done:
1101#endif
1102 ip_mc_clear_src(im);
1103}
1104
1105static void igmp_group_added(struct ip_mc_list *im)
1106{
1107 struct in_device *in_dev = im->interface;
1108
1109 if (im->loaded == 0) {
1110 im->loaded = 1;
1111 ip_mc_filter_add(in_dev, im->multiaddr);
1112 }
1113
1114#ifdef CONFIG_IP_MULTICAST
1115 if (im->multiaddr == IGMP_ALL_HOSTS)
1116 return;
1117
1118 if (in_dev->dead)
1119 return;
1120 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1121 spin_lock_bh(&im->lock);
1122 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1123 spin_unlock_bh(&im->lock);
1124 return;
1125 }
1126 /* else, v3 */
1127
1128 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1129 IGMP_Unsolicited_Report_Count;
1130 igmp_ifc_event(in_dev);
1131#endif
1132}
1133
1134
1135/*
1136 * Multicast list managers
1137 */
1138
1139
1140/*
1141 * A socket has joined a multicast group on device dev.
1142 */
1143
1144void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
1145{
1146 struct ip_mc_list *im;
1147
1148 ASSERT_RTNL();
1149
1150 for (im=in_dev->mc_list; im; im=im->next) {
1151 if (im->multiaddr == addr) {
1152 im->users++;
1153 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1154 goto out;
1155 }
1156 }
1157
8b3a7005 1158 im = kmalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1159 if (!im)
1160 goto out;
1161
1162 im->users=1;
1163 im->interface=in_dev;
1164 in_dev_hold(in_dev);
1165 im->multiaddr=addr;
1166 /* initial mode is (EX, empty) */
1167 im->sfmode = MCAST_EXCLUDE;
1168 im->sfcount[MCAST_INCLUDE] = 0;
1169 im->sfcount[MCAST_EXCLUDE] = 1;
1170 im->sources = NULL;
1171 im->tomb = NULL;
1172 im->crcount = 0;
1173 atomic_set(&im->refcnt, 1);
1174 spin_lock_init(&im->lock);
1175#ifdef CONFIG_IP_MULTICAST
1176 im->tm_running=0;
1177 init_timer(&im->timer);
1178 im->timer.data=(unsigned long)im;
1179 im->timer.function=&igmp_timer_expire;
1180 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1181 im->reporter = 0;
1182 im->gsquery = 0;
1183#endif
1184 im->loaded = 0;
1185 write_lock_bh(&in_dev->mc_list_lock);
1186 im->next=in_dev->mc_list;
1187 in_dev->mc_list=im;
1188 write_unlock_bh(&in_dev->mc_list_lock);
1189#ifdef CONFIG_IP_MULTICAST
1190 igmpv3_del_delrec(in_dev, im->multiaddr);
1191#endif
1192 igmp_group_added(im);
1193 if (!in_dev->dead)
1194 ip_rt_multicast_event(in_dev);
1195out:
1196 return;
1197}
1198
1199/*
1200 * A socket has left a multicast group on device dev
1201 */
1202
1203void ip_mc_dec_group(struct in_device *in_dev, u32 addr)
1204{
1205 struct ip_mc_list *i, **ip;
1206
1207 ASSERT_RTNL();
1208
1209 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1210 if (i->multiaddr==addr) {
1211 if (--i->users == 0) {
1212 write_lock_bh(&in_dev->mc_list_lock);
1213 *ip = i->next;
1214 write_unlock_bh(&in_dev->mc_list_lock);
1215 igmp_group_dropped(i);
1216
1217 if (!in_dev->dead)
1218 ip_rt_multicast_event(in_dev);
1219
1220 ip_ma_put(i);
1221 return;
1222 }
1223 break;
1224 }
1225 }
1226}
1227
1228/* Device going down */
1229
1230void ip_mc_down(struct in_device *in_dev)
1231{
1232 struct ip_mc_list *i;
1233
1234 ASSERT_RTNL();
1235
1236 for (i=in_dev->mc_list; i; i=i->next)
1237 igmp_group_dropped(i);
1238
1239#ifdef CONFIG_IP_MULTICAST
1240 in_dev->mr_ifc_count = 0;
1241 if (del_timer(&in_dev->mr_ifc_timer))
1242 __in_dev_put(in_dev);
1243 in_dev->mr_gq_running = 0;
1244 if (del_timer(&in_dev->mr_gq_timer))
1245 __in_dev_put(in_dev);
1246 igmpv3_clear_delrec(in_dev);
1247#endif
1248
1249 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1250}
1251
1252void ip_mc_init_dev(struct in_device *in_dev)
1253{
1254 ASSERT_RTNL();
1255
1256 in_dev->mc_tomb = NULL;
1257#ifdef CONFIG_IP_MULTICAST
1258 in_dev->mr_gq_running = 0;
1259 init_timer(&in_dev->mr_gq_timer);
1260 in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1261 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1262 in_dev->mr_ifc_count = 0;
1263 init_timer(&in_dev->mr_ifc_timer);
1264 in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1265 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1266 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1267#endif
1268
1269 rwlock_init(&in_dev->mc_list_lock);
1270 spin_lock_init(&in_dev->mc_tomb_lock);
1271}
1272
1273/* Device going up */
1274
1275void ip_mc_up(struct in_device *in_dev)
1276{
1277 struct ip_mc_list *i;
1278
1279 ASSERT_RTNL();
1280
1281 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1282
1283 for (i=in_dev->mc_list; i; i=i->next)
1284 igmp_group_added(i);
1285}
1286
1287/*
1288 * Device is about to be destroyed: clean up.
1289 */
1290
1291void ip_mc_destroy_dev(struct in_device *in_dev)
1292{
1293 struct ip_mc_list *i;
1294
1295 ASSERT_RTNL();
1296
1297 /* Deactivate timers */
1298 ip_mc_down(in_dev);
1299
1300 write_lock_bh(&in_dev->mc_list_lock);
1301 while ((i = in_dev->mc_list) != NULL) {
1302 in_dev->mc_list = i->next;
1303 write_unlock_bh(&in_dev->mc_list_lock);
1304
1305 igmp_group_dropped(i);
1306 ip_ma_put(i);
1307
1308 write_lock_bh(&in_dev->mc_list_lock);
1309 }
1310 write_unlock_bh(&in_dev->mc_list_lock);
1311}
1312
1313static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1314{
1315 struct flowi fl = { .nl_u = { .ip4_u =
1316 { .daddr = imr->imr_multiaddr.s_addr } } };
1317 struct rtable *rt;
1318 struct net_device *dev = NULL;
1319 struct in_device *idev = NULL;
1320
1321 if (imr->imr_ifindex) {
1322 idev = inetdev_by_index(imr->imr_ifindex);
1323 if (idev)
1324 __in_dev_put(idev);
1325 return idev;
1326 }
1327 if (imr->imr_address.s_addr) {
1328 dev = ip_dev_find(imr->imr_address.s_addr);
1329 if (!dev)
1330 return NULL;
1331 __dev_put(dev);
1332 }
1333
1334 if (!dev && !ip_route_output_key(&rt, &fl)) {
1335 dev = rt->u.dst.dev;
1336 ip_rt_put(rt);
1337 }
1338 if (dev) {
1339 imr->imr_ifindex = dev->ifindex;
e5ed6399 1340 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1341 }
1342 return idev;
1343}
1344
1345/*
1346 * Join a socket to a group
1347 */
1348int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS;
1349int sysctl_igmp_max_msf = IP_MAX_MSF;
1350
1351
1352static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1353 __u32 *psfsrc)
1354{
1355 struct ip_sf_list *psf, *psf_prev;
1356 int rv = 0;
1357
1358 psf_prev = NULL;
1359 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1360 if (psf->sf_inaddr == *psfsrc)
1361 break;
1362 psf_prev = psf;
1363 }
1364 if (!psf || psf->sf_count[sfmode] == 0) {
1365 /* source filter not found, or count wrong => bug */
1366 return -ESRCH;
1367 }
1368 psf->sf_count[sfmode]--;
1369 if (psf->sf_count[sfmode] == 0) {
1370 ip_rt_multicast_event(pmc->interface);
1371 }
1372 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1373#ifdef CONFIG_IP_MULTICAST
1374 struct in_device *in_dev = pmc->interface;
1375#endif
1376
1377 /* no more filters for this source */
1378 if (psf_prev)
1379 psf_prev->sf_next = psf->sf_next;
1380 else
1381 pmc->sources = psf->sf_next;
1382#ifdef CONFIG_IP_MULTICAST
1383 if (psf->sf_oldin &&
1384 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1385 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1386 IGMP_Unsolicited_Report_Count;
1387 psf->sf_next = pmc->tomb;
1388 pmc->tomb = psf;
1389 rv = 1;
1390 } else
1391#endif
1392 kfree(psf);
1393 }
1394 return rv;
1395}
1396
1397#ifndef CONFIG_IP_MULTICAST
1398#define igmp_ifc_event(x) do { } while (0)
1399#endif
1400
1401static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1402 int sfcount, __u32 *psfsrc, int delta)
1403{
1404 struct ip_mc_list *pmc;
1405 int changerec = 0;
1406 int i, err;
1407
1408 if (!in_dev)
1409 return -ENODEV;
1410 read_lock(&in_dev->mc_list_lock);
1411 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1412 if (*pmca == pmc->multiaddr)
1413 break;
1414 }
1415 if (!pmc) {
1416 /* MCA not found?? bug */
1417 read_unlock(&in_dev->mc_list_lock);
1418 return -ESRCH;
1419 }
1420 spin_lock_bh(&pmc->lock);
1421 read_unlock(&in_dev->mc_list_lock);
1422#ifdef CONFIG_IP_MULTICAST
1423 sf_markstate(pmc);
1424#endif
1425 if (!delta) {
1426 err = -EINVAL;
1427 if (!pmc->sfcount[sfmode])
1428 goto out_unlock;
1429 pmc->sfcount[sfmode]--;
1430 }
1431 err = 0;
1432 for (i=0; i<sfcount; i++) {
1433 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1434
1435 changerec |= rv > 0;
1436 if (!err && rv < 0)
1437 err = rv;
1438 }
1439 if (pmc->sfmode == MCAST_EXCLUDE &&
1440 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1441 pmc->sfcount[MCAST_INCLUDE]) {
1442#ifdef CONFIG_IP_MULTICAST
1443 struct ip_sf_list *psf;
1444#endif
1445
1446 /* filter mode change */
1447 pmc->sfmode = MCAST_INCLUDE;
1448#ifdef CONFIG_IP_MULTICAST
1449 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1450 IGMP_Unsolicited_Report_Count;
1451 in_dev->mr_ifc_count = pmc->crcount;
1452 for (psf=pmc->sources; psf; psf = psf->sf_next)
1453 psf->sf_crcount = 0;
1454 igmp_ifc_event(pmc->interface);
1455 } else if (sf_setstate(pmc) || changerec) {
1456 igmp_ifc_event(pmc->interface);
1457#endif
1458 }
1459out_unlock:
1460 spin_unlock_bh(&pmc->lock);
1461 return err;
1462}
1463
1464/*
1465 * Add multicast single-source filter to the interface list
1466 */
1467static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1468 __u32 *psfsrc, int delta)
1469{
1470 struct ip_sf_list *psf, *psf_prev;
1471
1472 psf_prev = NULL;
1473 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1474 if (psf->sf_inaddr == *psfsrc)
1475 break;
1476 psf_prev = psf;
1477 }
1478 if (!psf) {
8b3a7005 1479 psf = kmalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1480 if (!psf)
1481 return -ENOBUFS;
1482 memset(psf, 0, sizeof(*psf));
1483 psf->sf_inaddr = *psfsrc;
1484 if (psf_prev) {
1485 psf_prev->sf_next = psf;
1486 } else
1487 pmc->sources = psf;
1488 }
1489 psf->sf_count[sfmode]++;
1490 if (psf->sf_count[sfmode] == 1) {
1491 ip_rt_multicast_event(pmc->interface);
1492 }
1493 return 0;
1494}
1495
1496#ifdef CONFIG_IP_MULTICAST
1497static void sf_markstate(struct ip_mc_list *pmc)
1498{
1499 struct ip_sf_list *psf;
1500 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1501
1502 for (psf=pmc->sources; psf; psf=psf->sf_next)
1503 if (pmc->sfcount[MCAST_EXCLUDE]) {
1504 psf->sf_oldin = mca_xcount ==
1505 psf->sf_count[MCAST_EXCLUDE] &&
1506 !psf->sf_count[MCAST_INCLUDE];
1507 } else
1508 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1509}
1510
1511static int sf_setstate(struct ip_mc_list *pmc)
1512{
1513 struct ip_sf_list *psf;
1514 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1515 int qrv = pmc->interface->mr_qrv;
1516 int new_in, rv;
1517
1518 rv = 0;
1519 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1520 if (pmc->sfcount[MCAST_EXCLUDE]) {
1521 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1522 !psf->sf_count[MCAST_INCLUDE];
1523 } else
1524 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1525 if (new_in != psf->sf_oldin) {
1526 psf->sf_crcount = qrv;
1527 rv++;
1528 }
1529 }
1530 return rv;
1531}
1532#endif
1533
1534/*
1535 * Add multicast source filter list to the interface list
1536 */
1537static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1538 int sfcount, __u32 *psfsrc, int delta)
1539{
1540 struct ip_mc_list *pmc;
1541 int isexclude;
1542 int i, err;
1543
1544 if (!in_dev)
1545 return -ENODEV;
1546 read_lock(&in_dev->mc_list_lock);
1547 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1548 if (*pmca == pmc->multiaddr)
1549 break;
1550 }
1551 if (!pmc) {
1552 /* MCA not found?? bug */
1553 read_unlock(&in_dev->mc_list_lock);
1554 return -ESRCH;
1555 }
1556 spin_lock_bh(&pmc->lock);
1557 read_unlock(&in_dev->mc_list_lock);
1558
1559#ifdef CONFIG_IP_MULTICAST
1560 sf_markstate(pmc);
1561#endif
1562 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1563 if (!delta)
1564 pmc->sfcount[sfmode]++;
1565 err = 0;
1566 for (i=0; i<sfcount; i++) {
1567 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1568 if (err)
1569 break;
1570 }
1571 if (err) {
1572 int j;
1573
1574 pmc->sfcount[sfmode]--;
1575 for (j=0; j<i; j++)
1576 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1577 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1578#ifdef CONFIG_IP_MULTICAST
1579 struct in_device *in_dev = pmc->interface;
1580 struct ip_sf_list *psf;
1581#endif
1582
1583 /* filter mode change */
1584 if (pmc->sfcount[MCAST_EXCLUDE])
1585 pmc->sfmode = MCAST_EXCLUDE;
1586 else if (pmc->sfcount[MCAST_INCLUDE])
1587 pmc->sfmode = MCAST_INCLUDE;
1588#ifdef CONFIG_IP_MULTICAST
1589 /* else no filters; keep old mode for reports */
1590
1591 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1592 IGMP_Unsolicited_Report_Count;
1593 in_dev->mr_ifc_count = pmc->crcount;
1594 for (psf=pmc->sources; psf; psf = psf->sf_next)
1595 psf->sf_crcount = 0;
1596 igmp_ifc_event(in_dev);
1597 } else if (sf_setstate(pmc)) {
1598 igmp_ifc_event(in_dev);
1599#endif
1600 }
1601 spin_unlock_bh(&pmc->lock);
1602 return err;
1603}
1604
1605static void ip_mc_clear_src(struct ip_mc_list *pmc)
1606{
1607 struct ip_sf_list *psf, *nextpsf;
1608
1609 for (psf=pmc->tomb; psf; psf=nextpsf) {
1610 nextpsf = psf->sf_next;
1611 kfree(psf);
1612 }
1613 pmc->tomb = NULL;
1614 for (psf=pmc->sources; psf; psf=nextpsf) {
1615 nextpsf = psf->sf_next;
1616 kfree(psf);
1617 }
1618 pmc->sources = NULL;
1619 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1620 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1621 pmc->sfcount[MCAST_EXCLUDE] = 1;
1622}
1623
1624
1625/*
1626 * Join a multicast group
1627 */
1628int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1629{
1630 int err;
1631 u32 addr = imr->imr_multiaddr.s_addr;
ca9b907d 1632 struct ip_mc_socklist *iml=NULL, *i;
1da177e4
LT		 1633 struct in_device *in_dev;
1634 struct inet_sock *inet = inet_sk(sk);
ca9b907d 1635 int ifindex;
1da177e4
LT		 1636 int count = 0;
1637
1638 if (!MULTICAST(addr))
1639 return -EINVAL;
1640
1641 rtnl_shlock();
1642
1643 in_dev = ip_mc_find_dev(imr);
1644
1645 if (!in_dev) {
1646 iml = NULL;
1647 err = -ENODEV;
1648 goto done;
1649 }
1650
1da177e4 1651 err = -EADDRINUSE;
ca9b907d 1652 ifindex = imr->imr_ifindex;
1da177e4 1653 for (i = inet->mc_list; i; i = i->next) {
ca9b907d
DS		 1654 if (i->multi.imr_multiaddr.s_addr == addr &&
1655 i->multi.imr_ifindex == ifindex)
1da177e4 1656 goto done;
1da177e4
LT		 1657 count++;
1658 }
1659 err = -ENOBUFS;
ca9b907d
DS		 1660 if (count >= sysctl_igmp_max_memberships)
1661 goto done;
8b3a7005 1662 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
ca9b907d 1663 if (iml == NULL)
1da177e4 1664 goto done;
ca9b907d 1665
1da177e4
LT		 1666 memcpy(&iml->multi, imr, sizeof(*imr));
1667 iml->next = inet->mc_list;
1da177e4
LT		 1668 iml->sflist = NULL;
1669 iml->sfmode = MCAST_EXCLUDE;
1670 inet->mc_list = iml;
1671 ip_mc_inc_group(in_dev, addr);
1da177e4 1672 err = 0;
1da177e4
LT		 1673done:
1674 rtnl_shunlock();
1da177e4
LT		 1675 return err;
1676}
1677
1678static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1679 struct in_device *in_dev)
1680{
1681 int err;
1682
1683 if (iml->sflist == 0) {
1684 /* any-source empty exclude case */
1685 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1686 iml->sfmode, 0, NULL, 0);
1687 }
1688 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1689 iml->sfmode, iml->sflist->sl_count,
1690 iml->sflist->sl_addr, 0);
1691 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1692 iml->sflist = NULL;
1693 return err;
1694}
1695
1696/*
1697 * Ask a socket to leave a group.
1698 */
1699
1700int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1701{
1702 struct inet_sock *inet = inet_sk(sk);
1703 struct ip_mc_socklist *iml, **imlp;
84b42bae
DS		 1704 struct in_device *in_dev;
1705 u32 group = imr->imr_multiaddr.s_addr;
1706 u32 ifindex;
1da177e4
LT		 1707
1708 rtnl_lock();
84b42bae
DS		 1709 in_dev = ip_mc_find_dev(imr);
1710 if (!in_dev) {
1711 rtnl_unlock();
1712 return -ENODEV;
1713 }
1714 ifindex = imr->imr_ifindex;
1da177e4 1715 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
84b42bae
DS		 1716 if (iml->multi.imr_multiaddr.s_addr == group &&
1717 iml->multi.imr_ifindex == ifindex) {
1718 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4
LT		 1719
1720 *imlp = iml->next;
1721
84b42bae 1722 ip_mc_dec_group(in_dev, group);
1da177e4
LT		 1723 rtnl_unlock();
1724 sock_kfree_s(sk, iml, sizeof(*iml));
1725 return 0;
1726 }
1727 }
1728 rtnl_unlock();
1729 return -EADDRNOTAVAIL;
1730}
1731
1732int ip_mc_source(int add, int omode, struct sock *sk, struct
1733 ip_mreq_source *mreqs, int ifindex)
1734{
1735 int err;
1736 struct ip_mreqn imr;
1737 u32 addr = mreqs->imr_multiaddr;
1738 struct ip_mc_socklist *pmc;
1739 struct in_device *in_dev = NULL;
1740 struct inet_sock *inet = inet_sk(sk);
1741 struct ip_sf_socklist *psl;
8cdaaa15 1742 int leavegroup = 0;
1da177e4
LT		 1743 int i, j, rv;
1744
1745 if (!MULTICAST(addr))
1746 return -EINVAL;
1747
1748 rtnl_shlock();
1749
1750 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1751 imr.imr_address.s_addr = mreqs->imr_interface;
1752 imr.imr_ifindex = ifindex;
1753 in_dev = ip_mc_find_dev(&imr);
1754
1755 if (!in_dev) {
1756 err = -ENODEV;
1757 goto done;
1758 }
1759 err = -EADDRNOTAVAIL;
1760
1761 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
ca9b907d
DS		 1762 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1763 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1da177e4
LT		 1764 break;
1765 }
917f2f10
DS		 1766 if (!pmc) { /* must have a prior join */
1767 err = -EINVAL;
1da177e4 1768 goto done;
917f2f10 1769 }
1da177e4
LT		 1770 /* if a source filter was set, must be the same mode as before */
1771 if (pmc->sflist) {
917f2f10
DS		 1772 if (pmc->sfmode != omode) {
1773 err = -EINVAL;
1da177e4 1774 goto done;
917f2f10 1775 }
1da177e4
LT		 1776 } else if (pmc->sfmode != omode) {
1777 /* allow mode switches for empty-set filters */
1778 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1779 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1780 NULL, 0);
1781 pmc->sfmode = omode;
1782 }
1783
1784 psl = pmc->sflist;
1785 if (!add) {
1786 if (!psl)
917f2f10 1787 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1788 rv = !0;
1789 for (i=0; i<psl->sl_count; i++) {
1790 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1791 sizeof(__u32));
1792 if (rv == 0)
1793 break;
1794 }
1795 if (rv) /* source not found */
917f2f10 1796 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1797
8cdaaa15
DS		 1798 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1799 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1800 leavegroup = 1;
1801 goto done;
1802 }
1803
1da177e4
LT		 1804 /* update the interface filter */
1805 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1806 &mreqs->imr_sourceaddr, 1);
1807
1808 for (j=i+1; j<psl->sl_count; j++)
1809 psl->sl_addr[j-1] = psl->sl_addr[j];
1810 psl->sl_count--;
1811 err = 0;
1812 goto done;
1813 }
1814 /* else, add a new source to the filter */
1815
1816 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1817 err = -ENOBUFS;
1818 goto done;
1819 }
1820 if (!psl || psl->sl_count == psl->sl_max) {
1821 struct ip_sf_socklist *newpsl;
1822 int count = IP_SFBLOCK;
1823
1824 if (psl)
1825 count += psl->sl_max;
8b3a7005 1826 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 1827 if (!newpsl) {
1828 err = -ENOBUFS;
1829 goto done;
1830 }
1831 newpsl->sl_max = count;
1832 newpsl->sl_count = count - IP_SFBLOCK;
1833 if (psl) {
1834 for (i=0; i<psl->sl_count; i++)
1835 newpsl->sl_addr[i] = psl->sl_addr[i];
1836 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1837 }
1838 pmc->sflist = psl = newpsl;
1839 }
1840 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1841 for (i=0; i<psl->sl_count; i++) {
1842 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1843 sizeof(__u32));
1844 if (rv == 0)
1845 break;
1846 }
1847 if (rv == 0) /* address already there is an error */
1848 goto done;
1849 for (j=psl->sl_count-1; j>=i; j--)
1850 psl->sl_addr[j+1] = psl->sl_addr[j];
1851 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1852 psl->sl_count++;
1853 err = 0;
1854 /* update the interface list */
1855 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1856 &mreqs->imr_sourceaddr, 1);
1857done:
1858 rtnl_shunlock();
8cdaaa15
DS		 1859 if (leavegroup)
1860 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 1861 return err;
1862}
1863
1864int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1865{
9951f036 1866 int err = 0;
1da177e4
LT		 1867 struct ip_mreqn imr;
1868 u32 addr = msf->imsf_multiaddr;
1869 struct ip_mc_socklist *pmc;
1870 struct in_device *in_dev;
1871 struct inet_sock *inet = inet_sk(sk);
1872 struct ip_sf_socklist *newpsl, *psl;
9951f036 1873 int leavegroup = 0;
1da177e4
LT		 1874
1875 if (!MULTICAST(addr))
1876 return -EINVAL;
1877 if (msf->imsf_fmode != MCAST_INCLUDE &&
1878 msf->imsf_fmode != MCAST_EXCLUDE)
1879 return -EINVAL;
1880
1881 rtnl_shlock();
1882
1883 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1884 imr.imr_address.s_addr = msf->imsf_interface;
1885 imr.imr_ifindex = ifindex;
1886 in_dev = ip_mc_find_dev(&imr);
1887
1888 if (!in_dev) {
1889 err = -ENODEV;
1890 goto done;
1891 }
1da177e4 1892
9951f036
DS		 1893 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1894 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
1895 leavegroup = 1;
1896 goto done;
1897 }
1898
1da177e4
LT		 1899 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1900 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1901 pmc->multi.imr_ifindex == imr.imr_ifindex)
1902 break;
1903 }
917f2f10
DS		 1904 if (!pmc) { /* must have a prior join */
1905 err = -EINVAL;
1da177e4 1906 goto done;
917f2f10 1907 }
1da177e4 1908 if (msf->imsf_numsrc) {
8b3a7005
KK		 1909 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
1910 GFP_KERNEL);
1da177e4
LT		 1911 if (!newpsl) {
1912 err = -ENOBUFS;
1913 goto done;
1914 }
1915 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
1916 memcpy(newpsl->sl_addr, msf->imsf_slist,
1917 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
1918 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1919 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
1920 if (err) {
1921 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
1922 goto done;
1923 }
8713dbf0 1924 } else {
1da177e4 1925 newpsl = NULL;
8713dbf0
YZ		 1926 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1927 msf->imsf_fmode, 0, NULL, 0);
1928 }
1da177e4
LT		 1929 psl = pmc->sflist;
1930 if (psl) {
1931 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1932 psl->sl_count, psl->sl_addr, 0);
1933 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1934 } else
1935 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1936 0, NULL, 0);
1937 pmc->sflist = newpsl;
1938 pmc->sfmode = msf->imsf_fmode;
917f2f10 1939 err = 0;
1da177e4
LT		 1940done:
1941 rtnl_shunlock();
9951f036
DS		 1942 if (leavegroup)
1943 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 1944 return err;
1945}
1946
1947int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
1948 struct ip_msfilter __user *optval, int __user *optlen)
1949{
1950 int err, len, count, copycount;
1951 struct ip_mreqn imr;
1952 u32 addr = msf->imsf_multiaddr;
1953 struct ip_mc_socklist *pmc;
1954 struct in_device *in_dev;
1955 struct inet_sock *inet = inet_sk(sk);
1956 struct ip_sf_socklist *psl;
1957
1958 if (!MULTICAST(addr))
1959 return -EINVAL;
1960
1961 rtnl_shlock();
1962
1963 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1964 imr.imr_address.s_addr = msf->imsf_interface;
1965 imr.imr_ifindex = 0;
1966 in_dev = ip_mc_find_dev(&imr);
1967
1968 if (!in_dev) {
1969 err = -ENODEV;
1970 goto done;
1971 }
1972 err = -EADDRNOTAVAIL;
1973
1974 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1975 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1976 pmc->multi.imr_ifindex == imr.imr_ifindex)
1977 break;
1978 }
1979 if (!pmc) /* must have a prior join */
1980 goto done;
1981 msf->imsf_fmode = pmc->sfmode;
1982 psl = pmc->sflist;
1983 rtnl_shunlock();
1984 if (!psl) {
1985 len = 0;
1986 count = 0;
1987 } else {
1988 count = psl->sl_count;
1989 }
1990 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
1991 len = copycount * sizeof(psl->sl_addr[0]);
1992 msf->imsf_numsrc = count;
1993 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
1994 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
1995 return -EFAULT;
1996 }
1997 if (len &&
1998 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
1999 return -EFAULT;
2000 return 0;
2001done:
2002 rtnl_shunlock();
2003 return err;
2004}
2005
2006int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2007 struct group_filter __user *optval, int __user *optlen)
2008{
2009 int err, i, count, copycount;
2010 struct sockaddr_in *psin;
2011 u32 addr;
2012 struct ip_mc_socklist *pmc;
2013 struct inet_sock *inet = inet_sk(sk);
2014 struct ip_sf_socklist *psl;
2015
2016 psin = (struct sockaddr_in *)&gsf->gf_group;
2017 if (psin->sin_family != AF_INET)
2018 return -EINVAL;
2019 addr = psin->sin_addr.s_addr;
2020 if (!MULTICAST(addr))
2021 return -EINVAL;
2022
2023 rtnl_shlock();
2024
2025 err = -EADDRNOTAVAIL;
2026
2027 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2028 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2029 pmc->multi.imr_ifindex == gsf->gf_interface)
2030 break;
2031 }
2032 if (!pmc) /* must have a prior join */
2033 goto done;
2034 gsf->gf_fmode = pmc->sfmode;
2035 psl = pmc->sflist;
2036 rtnl_shunlock();
2037 count = psl ? psl->sl_count : 0;
2038 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2039 gsf->gf_numsrc = count;
2040 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2041 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2042 return -EFAULT;
2043 }
2044 for (i=0; i<copycount; i++) {
2045 struct sockaddr_in *psin;
2046 struct sockaddr_storage ss;
2047
2048 psin = (struct sockaddr_in *)&ss;
2049 memset(&ss, 0, sizeof(ss));
2050 psin->sin_family = AF_INET;
2051 psin->sin_addr.s_addr = psl->sl_addr[i];
2052 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2053 return -EFAULT;
2054 }
2055 return 0;
2056done:
2057 rtnl_shunlock();
2058 return err;
2059}
2060
2061/*
2062 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2063 */
2064int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
2065{
2066 struct inet_sock *inet = inet_sk(sk);
2067 struct ip_mc_socklist *pmc;
2068 struct ip_sf_socklist *psl;
2069 int i;
2070
2071 if (!MULTICAST(loc_addr))
2072 return 1;
2073
2074 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2075 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2076 pmc->multi.imr_ifindex == dif)
2077 break;
2078 }
2079 if (!pmc)
2080 return 1;
2081 psl = pmc->sflist;
2082 if (!psl)
2083 return pmc->sfmode == MCAST_EXCLUDE;
2084
2085 for (i=0; i<psl->sl_count; i++) {
2086 if (psl->sl_addr[i] == rmt_addr)
2087 break;
2088 }
2089 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2090 return 0;
2091 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2092 return 0;
2093 return 1;
2094}
2095
2096/*
2097 * A socket is closing.
2098 */
2099
2100void ip_mc_drop_socket(struct sock *sk)
2101{
2102 struct inet_sock *inet = inet_sk(sk);
2103 struct ip_mc_socklist *iml;
2104
2105 if (inet->mc_list == NULL)
2106 return;
2107
2108 rtnl_lock();
2109 while ((iml = inet->mc_list) != NULL) {
2110 struct in_device *in_dev;
2111 inet->mc_list = iml->next;
2112
2113 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) {
2114 (void) ip_mc_leave_src(sk, iml, in_dev);
2115 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2116 in_dev_put(in_dev);
2117 }
2118 sock_kfree_s(sk, iml, sizeof(*iml));
2119
2120 }
2121 rtnl_unlock();
2122}
2123
2124int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto)
2125{
2126 struct ip_mc_list *im;
2127 struct ip_sf_list *psf;
2128 int rv = 0;
2129
2130 read_lock(&in_dev->mc_list_lock);
2131 for (im=in_dev->mc_list; im; im=im->next) {
2132 if (im->multiaddr == mc_addr)
2133 break;
2134 }
2135 if (im && proto == IPPROTO_IGMP) {
2136 rv = 1;
2137 } else if (im) {
2138 if (src_addr) {
2139 for (psf=im->sources; psf; psf=psf->sf_next) {
2140 if (psf->sf_inaddr == src_addr)
2141 break;
2142 }
2143 if (psf)
2144 rv = psf->sf_count[MCAST_INCLUDE] ||
2145 psf->sf_count[MCAST_EXCLUDE] !=
2146 im->sfcount[MCAST_EXCLUDE];
2147 else
2148 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2149 } else
2150 rv = 1; /* unspecified source; tentatively allow */
2151 }
2152 read_unlock(&in_dev->mc_list_lock);
2153 return rv;
2154}
2155
2156#if defined(CONFIG_PROC_FS)
2157struct igmp_mc_iter_state {
2158 struct net_device *dev;
2159 struct in_device *in_dev;
2160};
2161
2162#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2163
2164static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2165{
2166 struct ip_mc_list *im = NULL;
2167 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2168
2169 for (state->dev = dev_base, state->in_dev = NULL;
2170 state->dev;
2171 state->dev = state->dev->next) {
2172 struct in_device *in_dev;
2173 in_dev = in_dev_get(state->dev);
2174 if (!in_dev)
2175 continue;
2176 read_lock(&in_dev->mc_list_lock);
2177 im = in_dev->mc_list;
2178 if (im) {
2179 state->in_dev = in_dev;
2180 break;
2181 }
2182 read_unlock(&in_dev->mc_list_lock);
2183 in_dev_put(in_dev);
2184 }
2185 return im;
2186}
2187
2188static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2189{
2190 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2191 im = im->next;
2192 while (!im) {
2193 if (likely(state->in_dev != NULL)) {
2194 read_unlock(&state->in_dev->mc_list_lock);
2195 in_dev_put(state->in_dev);
2196 }
2197 state->dev = state->dev->next;
2198 if (!state->dev) {
2199 state->in_dev = NULL;
2200 break;
2201 }
2202 state->in_dev = in_dev_get(state->dev);
2203 if (!state->in_dev)
2204 continue;
2205 read_lock(&state->in_dev->mc_list_lock);
2206 im = state->in_dev->mc_list;
2207 }
2208 return im;
2209}
2210
2211static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2212{
2213 struct ip_mc_list *im = igmp_mc_get_first(seq);
2214 if (im)
2215 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2216 --pos;
2217 return pos ? NULL : im;
2218}
2219
2220static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2221{
2222 read_lock(&dev_base_lock);
2223 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2224}
2225
2226static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2227{
2228 struct ip_mc_list *im;
2229 if (v == SEQ_START_TOKEN)
2230 im = igmp_mc_get_first(seq);
2231 else
2232 im = igmp_mc_get_next(seq, v);
2233 ++*pos;
2234 return im;
2235}
2236
2237static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2238{
2239 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2240 if (likely(state->in_dev != NULL)) {
2241 read_unlock(&state->in_dev->mc_list_lock);
2242 in_dev_put(state->in_dev);
2243 state->in_dev = NULL;
2244 }
2245 state->dev = NULL;
2246 read_unlock(&dev_base_lock);
2247}
2248
2249static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2250{
2251 if (v == SEQ_START_TOKEN)
2252 seq_puts(seq,
2253 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2254 else {
2255 struct ip_mc_list *im = (struct ip_mc_list *)v;
2256 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2257 char *querier;
2258#ifdef CONFIG_IP_MULTICAST
2259 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2260 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2261 "V3";
2262#else
2263 querier = "NONE";
2264#endif
2265
2266 if (state->in_dev->mc_list == im) {
2267 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2268 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2269 }
2270
2271 seq_printf(seq,
2272 "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n",
2273 im->multiaddr, im->users,
2274 im->tm_running, im->tm_running ?
2275 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2276 im->reporter);
2277 }
2278 return 0;
2279}
2280
2281static struct seq_operations igmp_mc_seq_ops = {
2282 .start = igmp_mc_seq_start,
2283 .next = igmp_mc_seq_next,
2284 .stop = igmp_mc_seq_stop,
2285 .show = igmp_mc_seq_show,
2286};
2287
2288static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2289{
2290 struct seq_file *seq;
2291 int rc = -ENOMEM;
2292 struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2293
2294 if (!s)
2295 goto out;
2296 rc = seq_open(file, &igmp_mc_seq_ops);
2297 if (rc)
2298 goto out_kfree;
2299
2300 seq = file->private_data;
2301 seq->private = s;
2302 memset(s, 0, sizeof(*s));
2303out:
2304 return rc;
2305out_kfree:
2306 kfree(s);
2307 goto out;
2308}
2309
2310static struct file_operations igmp_mc_seq_fops = {
2311 .owner = THIS_MODULE,
2312 .open = igmp_mc_seq_open,
2313 .read = seq_read,
2314 .llseek = seq_lseek,
2315 .release = seq_release_private,
2316};
2317
2318struct igmp_mcf_iter_state {
2319 struct net_device *dev;
2320 struct in_device *idev;
2321 struct ip_mc_list *im;
2322};
2323
2324#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2325
2326static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2327{
2328 struct ip_sf_list *psf = NULL;
2329 struct ip_mc_list *im = NULL;
2330 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2331
2332 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2333 state->dev;
2334 state->dev = state->dev->next) {
2335 struct in_device *idev;
2336 idev = in_dev_get(state->dev);
2337 if (unlikely(idev == NULL))
2338 continue;
2339 read_lock(&idev->mc_list_lock);
2340 im = idev->mc_list;
2341 if (likely(im != NULL)) {
2342 spin_lock_bh(&im->lock);
2343 psf = im->sources;
2344 if (likely(psf != NULL)) {
2345 state->im = im;
2346 state->idev = idev;
2347 break;
2348 }
2349 spin_unlock_bh(&im->lock);
2350 }
2351 read_unlock(&idev->mc_list_lock);
2352 in_dev_put(idev);
2353 }
2354 return psf;
2355}
2356
2357static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2358{
2359 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2360
2361 psf = psf->sf_next;
2362 while (!psf) {
2363 spin_unlock_bh(&state->im->lock);
2364 state->im = state->im->next;
2365 while (!state->im) {
2366 if (likely(state->idev != NULL)) {
2367 read_unlock(&state->idev->mc_list_lock);
2368 in_dev_put(state->idev);
2369 }
2370 state->dev = state->dev->next;
2371 if (!state->dev) {
2372 state->idev = NULL;
2373 goto out;
2374 }
2375 state->idev = in_dev_get(state->dev);
2376 if (!state->idev)
2377 continue;
2378 read_lock(&state->idev->mc_list_lock);
2379 state->im = state->idev->mc_list;
2380 }
2381 if (!state->im)
2382 break;
2383 spin_lock_bh(&state->im->lock);
2384 psf = state->im->sources;
2385 }
2386out:
2387 return psf;
2388}
2389
2390static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2391{
2392 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2393 if (psf)
2394 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2395 --pos;
2396 return pos ? NULL : psf;
2397}
2398
2399static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2400{
2401 read_lock(&dev_base_lock);
2402 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2403}
2404
2405static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2406{
2407 struct ip_sf_list *psf;
2408 if (v == SEQ_START_TOKEN)
2409 psf = igmp_mcf_get_first(seq);
2410 else
2411 psf = igmp_mcf_get_next(seq, v);
2412 ++*pos;
2413 return psf;
2414}
2415
2416static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2417{
2418 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2419 if (likely(state->im != NULL)) {
2420 spin_unlock_bh(&state->im->lock);
2421 state->im = NULL;
2422 }
2423 if (likely(state->idev != NULL)) {
2424 read_unlock(&state->idev->mc_list_lock);
2425 in_dev_put(state->idev);
2426 state->idev = NULL;
2427 }
2428 state->dev = NULL;
2429 read_unlock(&dev_base_lock);
2430}
2431
2432static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2433{
2434 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2435 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2436
2437 if (v == SEQ_START_TOKEN) {
2438 seq_printf(seq,
2439 "%3s %6s "
2440 "%10s %10s %6s %6s\n", "Idx",
2441 "Device", "MCA",
2442 "SRC", "INC", "EXC");
2443 } else {
2444 seq_printf(seq,
2445 "%3d %6.6s 0x%08x "
2446 "0x%08x %6lu %6lu\n",
2447 state->dev->ifindex, state->dev->name,
2448 ntohl(state->im->multiaddr),
2449 ntohl(psf->sf_inaddr),
2450 psf->sf_count[MCAST_INCLUDE],
2451 psf->sf_count[MCAST_EXCLUDE]);
2452 }
2453 return 0;
2454}
2455
2456static struct seq_operations igmp_mcf_seq_ops = {
2457 .start = igmp_mcf_seq_start,
2458 .next = igmp_mcf_seq_next,
2459 .stop = igmp_mcf_seq_stop,
2460 .show = igmp_mcf_seq_show,
2461};
2462
2463static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2464{
2465 struct seq_file *seq;
2466 int rc = -ENOMEM;
2467 struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2468
2469 if (!s)
2470 goto out;
2471 rc = seq_open(file, &igmp_mcf_seq_ops);
2472 if (rc)
2473 goto out_kfree;
2474
2475 seq = file->private_data;
2476 seq->private = s;
2477 memset(s, 0, sizeof(*s));
2478out:
2479 return rc;
2480out_kfree:
2481 kfree(s);
2482 goto out;
2483}
2484
2485static struct file_operations igmp_mcf_seq_fops = {
2486 .owner = THIS_MODULE,
2487 .open = igmp_mcf_seq_open,
2488 .read = seq_read,
2489 .llseek = seq_lseek,
2490 .release = seq_release_private,
2491};
2492
2493int __init igmp_mc_proc_init(void)
2494{
2495 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2496 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2497 return 0;
2498}
2499#endif
2500
2501EXPORT_SYMBOL(ip_mc_dec_group);
2502EXPORT_SYMBOL(ip_mc_inc_group);
2503EXPORT_SYMBOL(ip_mc_join_group);
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