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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
e905a9ed 38 * The enhancements are mainly based on Steve Deering's
1da177e4
LT		 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
e905a9ed
YH		 52 * memberships but was being deleted,
53 * which caused a "del_timer() called
1da177e4
LT		 54 * from %p with timer not initialized\n"
55 * message (960131).
e905a9ed 56 * Christian Daudt : removed del_timer from
1da177e4
LT		 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
1da177e4
LT		 75#include <linux/module.h>
76#include <asm/uaccess.h>
77#include <asm/system.h>
78#include <linux/types.h>
79#include <linux/kernel.h>
80#include <linux/jiffies.h>
81#include <linux/string.h>
82#include <linux/socket.h>
83#include <linux/sockios.h>
84#include <linux/in.h>
85#include <linux/inet.h>
86#include <linux/netdevice.h>
87#include <linux/skbuff.h>
88#include <linux/inetdevice.h>
89#include <linux/igmp.h>
90#include <linux/if_arp.h>
91#include <linux/rtnetlink.h>
92#include <linux/times.h>
14c85021
ACM		 93
94#include <net/arp.h>
1da177e4
LT		 95#include <net/ip.h>
96#include <net/protocol.h>
97#include <net/route.h>
98#include <net/sock.h>
99#include <net/checksum.h>
100#include <linux/netfilter_ipv4.h>
101#ifdef CONFIG_IP_MROUTE
102#include <linux/mroute.h>
103#endif
104#ifdef CONFIG_PROC_FS
105#include <linux/proc_fs.h>
106#include <linux/seq_file.h>
107#endif
108
109#define IP_MAX_MEMBERSHIPS 20
110#define IP_MAX_MSF 10
111
112#ifdef CONFIG_IP_MULTICAST
113/* Parameter names and values are taken from igmp-v2-06 draft */
114
115#define IGMP_V1_Router_Present_Timeout (400*HZ)
116#define IGMP_V2_Router_Present_Timeout (400*HZ)
117#define IGMP_Unsolicited_Report_Interval (10*HZ)
118#define IGMP_Query_Response_Interval (10*HZ)
119#define IGMP_Unsolicited_Report_Count 2
120
121
122#define IGMP_Initial_Report_Delay (1)
123
124/* IGMP_Initial_Report_Delay is not from IGMP specs!
125 * IGMP specs require to report membership immediately after
126 * joining a group, but we delay the first report by a
127 * small interval. It seems more natural and still does not
128 * contradict to specs provided this delay is small enough.
129 */
130
131#define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \
132 (in_dev)->cnf.force_igmp_version == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135#define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \
136 (in_dev)->cnf.force_igmp_version == 2 || \
137 ((in_dev)->mr_v2_seen && \
138 time_before(jiffies, (in_dev)->mr_v2_seen)))
139
140static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
63007727 141static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
1da177e4
LT		 142static void igmpv3_clear_delrec(struct in_device *in_dev);
143static int sf_setstate(struct ip_mc_list *pmc);
144static void sf_markstate(struct ip_mc_list *pmc);
145#endif
146static void ip_mc_clear_src(struct ip_mc_list *pmc);
8f935bbd
AV		 147static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
148 int sfcount, __be32 *psfsrc, int delta);
1da177e4
LT		 149
150static void ip_ma_put(struct ip_mc_list *im)
151{
152 if (atomic_dec_and_test(&im->refcnt)) {
153 in_dev_put(im->interface);
154 kfree(im);
155 }
156}
157
158#ifdef CONFIG_IP_MULTICAST
159
160/*
161 * Timer management
162 */
163
164static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
165{
166 spin_lock_bh(&im->lock);
167 if (del_timer(&im->timer))
168 atomic_dec(&im->refcnt);
169 im->tm_running=0;
170 im->reporter = 0;
171 im->unsolicit_count = 0;
172 spin_unlock_bh(&im->lock);
173}
174
175/* It must be called with locked im->lock */
176static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
177{
178 int tv=net_random() % max_delay;
179
180 im->tm_running=1;
181 if (!mod_timer(&im->timer, jiffies+tv+2))
182 atomic_inc(&im->refcnt);
183}
184
185static void igmp_gq_start_timer(struct in_device *in_dev)
186{
187 int tv = net_random() % in_dev->mr_maxdelay;
188
189 in_dev->mr_gq_running = 1;
190 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
191 in_dev_hold(in_dev);
192}
193
194static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
195{
196 int tv = net_random() % delay;
197
198 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
199 in_dev_hold(in_dev);
200}
201
202static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
203{
204 spin_lock_bh(&im->lock);
205 im->unsolicit_count = 0;
206 if (del_timer(&im->timer)) {
207 if ((long)(im->timer.expires-jiffies) < max_delay) {
208 add_timer(&im->timer);
209 im->tm_running=1;
210 spin_unlock_bh(&im->lock);
211 return;
212 }
213 atomic_dec(&im->refcnt);
214 }
215 igmp_start_timer(im, max_delay);
216 spin_unlock_bh(&im->lock);
217}
218
219
220/*
221 * Send an IGMP report.
222 */
223
224#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
225
226
227static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
228 int gdeleted, int sdeleted)
229{
230 switch (type) {
231 case IGMPV3_MODE_IS_INCLUDE:
232 case IGMPV3_MODE_IS_EXCLUDE:
233 if (gdeleted || sdeleted)
234 return 0;
ad12583f
DS		 235 if (!(pmc->gsquery && !psf->sf_gsresp)) {
236 if (pmc->sfmode == MCAST_INCLUDE)
237 return 1;
238 /* don't include if this source is excluded
239 * in all filters
240 */
241 if (psf->sf_count[MCAST_INCLUDE])
242 return type == IGMPV3_MODE_IS_INCLUDE;
243 return pmc->sfcount[MCAST_EXCLUDE] ==
244 psf->sf_count[MCAST_EXCLUDE];
245 }
246 return 0;
1da177e4
LT		 247 case IGMPV3_CHANGE_TO_INCLUDE:
248 if (gdeleted || sdeleted)
249 return 0;
250 return psf->sf_count[MCAST_INCLUDE] != 0;
251 case IGMPV3_CHANGE_TO_EXCLUDE:
252 if (gdeleted || sdeleted)
253 return 0;
254 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
255 psf->sf_count[MCAST_INCLUDE])
256 return 0;
257 return pmc->sfcount[MCAST_EXCLUDE] ==
258 psf->sf_count[MCAST_EXCLUDE];
259 case IGMPV3_ALLOW_NEW_SOURCES:
260 if (gdeleted || !psf->sf_crcount)
261 return 0;
262 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
263 case IGMPV3_BLOCK_OLD_SOURCES:
264 if (pmc->sfmode == MCAST_INCLUDE)
265 return gdeleted || (psf->sf_crcount && sdeleted);
266 return psf->sf_crcount && !gdeleted && !sdeleted;
267 }
268 return 0;
269}
270
271static int
272igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
273{
274 struct ip_sf_list *psf;
275 int scount = 0;
276
277 for (psf=pmc->sources; psf; psf=psf->sf_next) {
278 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
279 continue;
280 scount++;
281 }
282 return scount;
283}
284
285static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
286{
287 struct sk_buff *skb;
288 struct rtable *rt;
289 struct iphdr *pip;
290 struct igmpv3_report *pig;
291
292 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
293 if (skb == NULL)
294 return NULL;
295
296 {
297 struct flowi fl = { .oif = dev->ifindex,
298 .nl_u = { .ip4_u = {
299 .daddr = IGMPV3_ALL_MCR } },
300 .proto = IPPROTO_IGMP };
301 if (ip_route_output_key(&rt, &fl)) {
302 kfree_skb(skb);
303 return NULL;
304 }
305 }
306 if (rt->rt_src == 0) {
307 kfree_skb(skb);
308 ip_rt_put(rt);
309 return NULL;
310 }
311
312 skb->dst = &rt->u.dst;
313 skb->dev = dev;
314
315 skb_reserve(skb, LL_RESERVED_SPACE(dev));
316
7e28ecc2 317 skb_reset_network_header(skb);
eddc9ec5 318 pip = ip_hdr(skb);
7e28ecc2 319 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 320
321 pip->version = 4;
322 pip->ihl = (sizeof(struct iphdr)+4)>>2;
323 pip->tos = 0xc0;
324 pip->frag_off = htons(IP_DF);
325 pip->ttl = 1;
326 pip->daddr = rt->rt_dst;
327 pip->saddr = rt->rt_src;
328 pip->protocol = IPPROTO_IGMP;
329 pip->tot_len = 0; /* filled in later */
330 ip_select_ident(pip, &rt->u.dst, NULL);
331 ((u8*)&pip[1])[0] = IPOPT_RA;
332 ((u8*)&pip[1])[1] = 4;
333 ((u8*)&pip[1])[2] = 0;
334 ((u8*)&pip[1])[3] = 0;
335
336 pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig));
337 skb->h.igmph = (struct igmphdr *)pig;
338 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
339 pig->resv1 = 0;
340 pig->csum = 0;
341 pig->resv2 = 0;
342 pig->ngrec = 0;
343 return skb;
344}
345
346static int igmpv3_sendpack(struct sk_buff *skb)
347{
eddc9ec5 348 struct iphdr *pip = ip_hdr(skb);
1da177e4 349 struct igmphdr *pig = skb->h.igmph;
eddc9ec5
ACM		 350 const int iplen = skb->tail - skb->nh.raw;
351 const int igmplen = skb->tail - skb->h.raw;
1da177e4 352
1da177e4
LT		 353 pip->tot_len = htons(iplen);
354 ip_send_check(pip);
eddc9ec5 355 pig->csum = ip_compute_csum(skb->h.igmph, igmplen);
1da177e4
LT		 356
357 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
358 dst_output);
359}
360
361static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
362{
363 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
364}
365
366static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
367 int type, struct igmpv3_grec **ppgr)
368{
369 struct net_device *dev = pmc->interface->dev;
370 struct igmpv3_report *pih;
371 struct igmpv3_grec *pgr;
372
373 if (!skb)
374 skb = igmpv3_newpack(dev, dev->mtu);
375 if (!skb)
376 return NULL;
377 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
378 pgr->grec_type = type;
379 pgr->grec_auxwords = 0;
380 pgr->grec_nsrcs = 0;
381 pgr->grec_mca = pmc->multiaddr;
382 pih = (struct igmpv3_report *)skb->h.igmph;
383 pih->ngrec = htons(ntohs(pih->ngrec)+1);
384 *ppgr = pgr;
385 return skb;
386}
387
388#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
389 skb_tailroom(skb)) : 0)
390
391static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
392 int type, int gdeleted, int sdeleted)
393{
394 struct net_device *dev = pmc->interface->dev;
395 struct igmpv3_report *pih;
396 struct igmpv3_grec *pgr = NULL;
397 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
ad12583f 398 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 399
400 if (pmc->multiaddr == IGMP_ALL_HOSTS)
401 return skb;
402
403 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
404 type == IGMPV3_MODE_IS_EXCLUDE;
405 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
406 type == IGMPV3_CHANGE_TO_EXCLUDE;
407
ad12583f
DS		 408 stotal = scount = 0;
409
1da177e4
LT		 410 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
411
ad12583f
DS		 412 if (!*psf_list)
413 goto empty_source;
414
1da177e4
LT		 415 pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL;
416
417 /* EX and TO_EX get a fresh packet, if needed */
418 if (truncate) {
419 if (pih && pih->ngrec &&
420 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
421 if (skb)
422 igmpv3_sendpack(skb);
423 skb = igmpv3_newpack(dev, dev->mtu);
424 }
425 }
426 first = 1;
1da177e4
LT		 427 psf_prev = NULL;
428 for (psf=*psf_list; psf; psf=psf_next) {
ea4d9e72 429 __be32 *psrc;
1da177e4
LT		 430
431 psf_next = psf->sf_next;
432
433 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
434 psf_prev = psf;
435 continue;
436 }
437
438 /* clear marks on query responses */
439 if (isquery)
440 psf->sf_gsresp = 0;
441
63007727 442 if (AVAILABLE(skb) < sizeof(__be32) +
1da177e4
LT		 443 first*sizeof(struct igmpv3_grec)) {
444 if (truncate && !first)
445 break; /* truncate these */
446 if (pgr)
447 pgr->grec_nsrcs = htons(scount);
448 if (skb)
449 igmpv3_sendpack(skb);
450 skb = igmpv3_newpack(dev, dev->mtu);
451 first = 1;
452 scount = 0;
453 }
454 if (first) {
455 skb = add_grhead(skb, pmc, type, &pgr);
456 first = 0;
457 }
cc63f70b
AD		 458 if (!skb)
459 return NULL;
63007727 460 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
1da177e4 461 *psrc = psf->sf_inaddr;
ad12583f 462 scount++; stotal++;
1da177e4
LT		 463 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
464 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
465 psf->sf_crcount--;
466 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
467 if (psf_prev)
468 psf_prev->sf_next = psf->sf_next;
469 else
470 *psf_list = psf->sf_next;
471 kfree(psf);
472 continue;
473 }
474 }
475 psf_prev = psf;
476 }
ad12583f
DS		 477
478empty_source:
479 if (!stotal) {
480 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
481 type == IGMPV3_BLOCK_OLD_SOURCES)
482 return skb;
483 if (pmc->crcount || isquery) {
484 /* make sure we have room for group header */
485 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
486 igmpv3_sendpack(skb);
487 skb = NULL; /* add_grhead will get a new one */
488 }
489 skb = add_grhead(skb, pmc, type, &pgr);
490 }
491 }
1da177e4
LT		 492 if (pgr)
493 pgr->grec_nsrcs = htons(scount);
494
495 if (isquery)
496 pmc->gsquery = 0; /* clear query state on report */
497 return skb;
498}
499
500static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
501{
502 struct sk_buff *skb = NULL;
503 int type;
504
505 if (!pmc) {
506 read_lock(&in_dev->mc_list_lock);
507 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
508 if (pmc->multiaddr == IGMP_ALL_HOSTS)
509 continue;
510 spin_lock_bh(&pmc->lock);
511 if (pmc->sfcount[MCAST_EXCLUDE])
512 type = IGMPV3_MODE_IS_EXCLUDE;
513 else
514 type = IGMPV3_MODE_IS_INCLUDE;
515 skb = add_grec(skb, pmc, type, 0, 0);
516 spin_unlock_bh(&pmc->lock);
517 }
518 read_unlock(&in_dev->mc_list_lock);
519 } else {
520 spin_lock_bh(&pmc->lock);
521 if (pmc->sfcount[MCAST_EXCLUDE])
522 type = IGMPV3_MODE_IS_EXCLUDE;
523 else
524 type = IGMPV3_MODE_IS_INCLUDE;
525 skb = add_grec(skb, pmc, type, 0, 0);
526 spin_unlock_bh(&pmc->lock);
527 }
528 if (!skb)
529 return 0;
530 return igmpv3_sendpack(skb);
531}
532
533/*
534 * remove zero-count source records from a source filter list
535 */
536static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
537{
538 struct ip_sf_list *psf_prev, *psf_next, *psf;
539
540 psf_prev = NULL;
541 for (psf=*ppsf; psf; psf = psf_next) {
542 psf_next = psf->sf_next;
543 if (psf->sf_crcount == 0) {
544 if (psf_prev)
545 psf_prev->sf_next = psf->sf_next;
546 else
547 *ppsf = psf->sf_next;
548 kfree(psf);
549 } else
550 psf_prev = psf;
551 }
552}
553
554static void igmpv3_send_cr(struct in_device *in_dev)
555{
556 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
557 struct sk_buff *skb = NULL;
558 int type, dtype;
559
560 read_lock(&in_dev->mc_list_lock);
561 spin_lock_bh(&in_dev->mc_tomb_lock);
562
563 /* deleted MCA's */
564 pmc_prev = NULL;
565 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
566 pmc_next = pmc->next;
567 if (pmc->sfmode == MCAST_INCLUDE) {
568 type = IGMPV3_BLOCK_OLD_SOURCES;
569 dtype = IGMPV3_BLOCK_OLD_SOURCES;
570 skb = add_grec(skb, pmc, type, 1, 0);
571 skb = add_grec(skb, pmc, dtype, 1, 1);
572 }
573 if (pmc->crcount) {
1da177e4
LT		 574 if (pmc->sfmode == MCAST_EXCLUDE) {
575 type = IGMPV3_CHANGE_TO_INCLUDE;
576 skb = add_grec(skb, pmc, type, 1, 0);
577 }
ad12583f 578 pmc->crcount--;
1da177e4
LT		 579 if (pmc->crcount == 0) {
580 igmpv3_clear_zeros(&pmc->tomb);
581 igmpv3_clear_zeros(&pmc->sources);
582 }
583 }
584 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
585 if (pmc_prev)
586 pmc_prev->next = pmc_next;
587 else
588 in_dev->mc_tomb = pmc_next;
589 in_dev_put(pmc->interface);
590 kfree(pmc);
591 } else
592 pmc_prev = pmc;
593 }
594 spin_unlock_bh(&in_dev->mc_tomb_lock);
595
596 /* change recs */
597 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
598 spin_lock_bh(&pmc->lock);
599 if (pmc->sfcount[MCAST_EXCLUDE]) {
600 type = IGMPV3_BLOCK_OLD_SOURCES;
601 dtype = IGMPV3_ALLOW_NEW_SOURCES;
602 } else {
603 type = IGMPV3_ALLOW_NEW_SOURCES;
604 dtype = IGMPV3_BLOCK_OLD_SOURCES;
605 }
606 skb = add_grec(skb, pmc, type, 0, 0);
607 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
608
609 /* filter mode changes */
610 if (pmc->crcount) {
1da177e4
LT		 611 if (pmc->sfmode == MCAST_EXCLUDE)
612 type = IGMPV3_CHANGE_TO_EXCLUDE;
613 else
614 type = IGMPV3_CHANGE_TO_INCLUDE;
615 skb = add_grec(skb, pmc, type, 0, 0);
ad12583f 616 pmc->crcount--;
1da177e4
LT		 617 }
618 spin_unlock_bh(&pmc->lock);
619 }
620 read_unlock(&in_dev->mc_list_lock);
621
622 if (!skb)
623 return;
624 (void) igmpv3_sendpack(skb);
625}
626
627static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
628 int type)
629{
630 struct sk_buff *skb;
631 struct iphdr *iph;
632 struct igmphdr *ih;
633 struct rtable *rt;
634 struct net_device *dev = in_dev->dev;
63007727
AV		 635 __be32 group = pmc ? pmc->multiaddr : 0;
636 __be32 dst;
1da177e4
LT		 637
638 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
639 return igmpv3_send_report(in_dev, pmc);
640 else if (type == IGMP_HOST_LEAVE_MESSAGE)
641 dst = IGMP_ALL_ROUTER;
642 else
643 dst = group;
644
645 {
646 struct flowi fl = { .oif = dev->ifindex,
647 .nl_u = { .ip4_u = { .daddr = dst } },
648 .proto = IPPROTO_IGMP };
649 if (ip_route_output_key(&rt, &fl))
650 return -1;
651 }
652 if (rt->rt_src == 0) {
653 ip_rt_put(rt);
654 return -1;
655 }
656
657 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
658 if (skb == NULL) {
659 ip_rt_put(rt);
660 return -1;
661 }
662
663 skb->dst = &rt->u.dst;
664
665 skb_reserve(skb, LL_RESERVED_SPACE(dev));
666
7e28ecc2 667 skb_reset_network_header(skb);
eddc9ec5 668 iph = ip_hdr(skb);
7e28ecc2 669 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 670
671 iph->version = 4;
672 iph->ihl = (sizeof(struct iphdr)+4)>>2;
673 iph->tos = 0xc0;
674 iph->frag_off = htons(IP_DF);
675 iph->ttl = 1;
676 iph->daddr = dst;
677 iph->saddr = rt->rt_src;
678 iph->protocol = IPPROTO_IGMP;
679 iph->tot_len = htons(IGMP_SIZE);
680 ip_select_ident(iph, &rt->u.dst, NULL);
681 ((u8*)&iph[1])[0] = IPOPT_RA;
682 ((u8*)&iph[1])[1] = 4;
683 ((u8*)&iph[1])[2] = 0;
684 ((u8*)&iph[1])[3] = 0;
685 ip_send_check(iph);
686
687 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
688 ih->type=type;
689 ih->code=0;
690 ih->csum=0;
691 ih->group=group;
692 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
693
694 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
695 dst_output);
696}
697
698static void igmp_gq_timer_expire(unsigned long data)
699{
700 struct in_device *in_dev = (struct in_device *)data;
701
702 in_dev->mr_gq_running = 0;
703 igmpv3_send_report(in_dev, NULL);
704 __in_dev_put(in_dev);
705}
706
707static void igmp_ifc_timer_expire(unsigned long data)
708{
709 struct in_device *in_dev = (struct in_device *)data;
710
711 igmpv3_send_cr(in_dev);
712 if (in_dev->mr_ifc_count) {
713 in_dev->mr_ifc_count--;
714 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
715 }
716 __in_dev_put(in_dev);
717}
718
719static void igmp_ifc_event(struct in_device *in_dev)
720{
721 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
722 return;
e905a9ed 723 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 724 IGMP_Unsolicited_Report_Count;
725 igmp_ifc_start_timer(in_dev, 1);
726}
727
728
729static void igmp_timer_expire(unsigned long data)
730{
731 struct ip_mc_list *im=(struct ip_mc_list *)data;
732 struct in_device *in_dev = im->interface;
733
734 spin_lock(&im->lock);
735 im->tm_running=0;
736
737 if (im->unsolicit_count) {
738 im->unsolicit_count--;
739 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
740 }
741 im->reporter = 1;
742 spin_unlock(&im->lock);
743
744 if (IGMP_V1_SEEN(in_dev))
745 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
746 else if (IGMP_V2_SEEN(in_dev))
747 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
748 else
749 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
750
751 ip_ma_put(im);
752}
753
ad12583f 754/* mark EXCLUDE-mode sources */
ea4d9e72 755static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 756{
757 struct ip_sf_list *psf;
758 int i, scount;
759
ad12583f
DS		 760 scount = 0;
761 for (psf=pmc->sources; psf; psf=psf->sf_next) {
762 if (scount == nsrcs)
763 break;
764 for (i=0; i<nsrcs; i++) {
765 /* skip inactive filters */
766 if (pmc->sfcount[MCAST_INCLUDE] ||
767 pmc->sfcount[MCAST_EXCLUDE] !=
768 psf->sf_count[MCAST_EXCLUDE])
769 continue;
770 if (srcs[i] == psf->sf_inaddr) {
771 scount++;
772 break;
773 }
774 }
775 }
776 pmc->gsquery = 0;
777 if (scount == nsrcs) /* all sources excluded */
778 return 0;
779 return 1;
780}
781
ea4d9e72 782static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 783{
784 struct ip_sf_list *psf;
785 int i, scount;
786
787 if (pmc->sfmode == MCAST_EXCLUDE)
788 return igmp_xmarksources(pmc, nsrcs, srcs);
789
790 /* mark INCLUDE-mode sources */
1da177e4
LT		 791 scount = 0;
792 for (psf=pmc->sources; psf; psf=psf->sf_next) {
793 if (scount == nsrcs)
794 break;
795 for (i=0; i<nsrcs; i++)
796 if (srcs[i] == psf->sf_inaddr) {
797 psf->sf_gsresp = 1;
798 scount++;
799 break;
800 }
801 }
ad12583f
DS		 802 if (!scount) {
803 pmc->gsquery = 0;
804 return 0;
805 }
806 pmc->gsquery = 1;
807 return 1;
1da177e4
LT		 808}
809
63007727 810static void igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 811{
812 struct ip_mc_list *im;
813
814 /* Timers are only set for non-local groups */
815
816 if (group == IGMP_ALL_HOSTS)
817 return;
818
819 read_lock(&in_dev->mc_list_lock);
820 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
821 if (im->multiaddr == group) {
822 igmp_stop_timer(im);
823 break;
824 }
825 }
826 read_unlock(&in_dev->mc_list_lock);
827}
828
829static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
830 int len)
831{
832 struct igmphdr *ih = skb->h.igmph;
833 struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
834 struct ip_mc_list *im;
63007727 835 __be32 group = ih->group;
1da177e4
LT		 836 int max_delay;
837 int mark = 0;
838
839
840 if (len == 8) {
841 if (ih->code == 0) {
842 /* Alas, old v1 router presents here. */
e905a9ed 843
1da177e4
LT		 844 max_delay = IGMP_Query_Response_Interval;
845 in_dev->mr_v1_seen = jiffies +
846 IGMP_V1_Router_Present_Timeout;
847 group = 0;
848 } else {
849 /* v2 router present */
850 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
851 in_dev->mr_v2_seen = jiffies +
852 IGMP_V2_Router_Present_Timeout;
853 }
854 /* cancel the interface change timer */
855 in_dev->mr_ifc_count = 0;
856 if (del_timer(&in_dev->mr_ifc_timer))
857 __in_dev_put(in_dev);
858 /* clear deleted report items */
859 igmpv3_clear_delrec(in_dev);
860 } else if (len < 12) {
861 return; /* ignore bogus packet; freed by caller */
862 } else { /* v3 */
863 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
864 return;
e905a9ed 865
1da177e4
LT		 866 ih3 = (struct igmpv3_query *) skb->h.raw;
867 if (ih3->nsrcs) {
e905a9ed 868 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 869 + ntohs(ih3->nsrcs)*sizeof(__be32)))
1da177e4
LT		 870 return;
871 ih3 = (struct igmpv3_query *) skb->h.raw;
872 }
873
874 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
875 if (!max_delay)
876 max_delay = 1; /* can't mod w/ 0 */
877 in_dev->mr_maxdelay = max_delay;
878 if (ih3->qrv)
879 in_dev->mr_qrv = ih3->qrv;
880 if (!group) { /* general query */
881 if (ih3->nsrcs)
882 return; /* no sources allowed */
883 igmp_gq_start_timer(in_dev);
884 return;
885 }
886 /* mark sources to include, if group & source-specific */
887 mark = ih3->nsrcs != 0;
888 }
889
890 /*
891 * - Start the timers in all of our membership records
892 * that the query applies to for the interface on
893 * which the query arrived excl. those that belong
894 * to a "local" group (224.0.0.X)
895 * - For timers already running check if they need to
896 * be reset.
897 * - Use the igmp->igmp_code field as the maximum
898 * delay possible
899 */
900 read_lock(&in_dev->mc_list_lock);
901 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
ad12583f
DS		 902 int changed;
903
1da177e4
LT		 904 if (group && group != im->multiaddr)
905 continue;
906 if (im->multiaddr == IGMP_ALL_HOSTS)
907 continue;
908 spin_lock_bh(&im->lock);
909 if (im->tm_running)
910 im->gsquery = im->gsquery && mark;
911 else
912 im->gsquery = mark;
ad12583f 913 changed = !im->gsquery ||
e905a9ed 914 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 915 spin_unlock_bh(&im->lock);
ad12583f
DS		 916 if (changed)
917 igmp_mod_timer(im, max_delay);
1da177e4
LT		 918 }
919 read_unlock(&in_dev->mc_list_lock);
920}
921
922int igmp_rcv(struct sk_buff *skb)
923{
924 /* This basically follows the spec line by line -- see RFC1112 */
925 struct igmphdr *ih;
926 struct in_device *in_dev = in_dev_get(skb->dev);
927 int len = skb->len;
928
929 if (in_dev==NULL) {
930 kfree_skb(skb);
931 return 0;
932 }
933
fb286bb2
HX		 934 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
935 goto drop;
936
937 switch (skb->ip_summed) {
84fa7933 938 case CHECKSUM_COMPLETE:
d3bc23e7 939 if (!csum_fold(skb->csum))
fb286bb2
HX		 940 break;
941 /* fall through */
942 case CHECKSUM_NONE:
943 skb->csum = 0;
944 if (__skb_checksum_complete(skb))
945 goto drop;
1da177e4
LT		 946 }
947
948 ih = skb->h.igmph;
949 switch (ih->type) {
950 case IGMP_HOST_MEMBERSHIP_QUERY:
951 igmp_heard_query(in_dev, skb, len);
952 break;
953 case IGMP_HOST_MEMBERSHIP_REPORT:
954 case IGMPV2_HOST_MEMBERSHIP_REPORT:
955 case IGMPV3_HOST_MEMBERSHIP_REPORT:
956 /* Is it our report looped back? */
957 if (((struct rtable*)skb->dst)->fl.iif == 0)
958 break;
24c69275
DS		 959 /* don't rely on MC router hearing unicast reports */
960 if (skb->pkt_type == PACKET_MULTICAST ||
961 skb->pkt_type == PACKET_BROADCAST)
962 igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 963 break;
964 case IGMP_PIM:
965#ifdef CONFIG_IP_PIMSM_V1
966 in_dev_put(in_dev);
967 return pim_rcv_v1(skb);
968#endif
969 case IGMP_DVMRP:
970 case IGMP_TRACE:
971 case IGMP_HOST_LEAVE_MESSAGE:
972 case IGMP_MTRACE:
973 case IGMP_MTRACE_RESP:
974 break;
975 default:
dd1c1853 976 break;
1da177e4 977 }
fb286bb2
HX		 978
979drop:
1da177e4
LT		 980 in_dev_put(in_dev);
981 kfree_skb(skb);
982 return 0;
983}
984
985#endif
986
987
988/*
989 * Add a filter to a device
990 */
991
63007727 992static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 993{
994 char buf[MAX_ADDR_LEN];
995 struct net_device *dev = in_dev->dev;
996
997 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
998 We will get multicast token leakage, when IFF_MULTICAST
999 is changed. This check should be done in dev->set_multicast_list
1000 routine. Something sort of:
1001 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1002 --ANK
1003 */
1004 if (arp_mc_map(addr, buf, dev, 0) == 0)
1005 dev_mc_add(dev,buf,dev->addr_len,0);
1006}
1007
1008/*
1009 * Remove a filter from a device
1010 */
1011
63007727 1012static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1013{
1014 char buf[MAX_ADDR_LEN];
1015 struct net_device *dev = in_dev->dev;
1016
1017 if (arp_mc_map(addr, buf, dev, 0) == 0)
1018 dev_mc_delete(dev,buf,dev->addr_len,0);
1019}
1020
1021#ifdef CONFIG_IP_MULTICAST
1022/*
1023 * deleted ip_mc_list manipulation
1024 */
1025static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1026{
1027 struct ip_mc_list *pmc;
1028
1029 /* this is an "ip_mc_list" for convenience; only the fields below
1030 * are actually used. In particular, the refcnt and users are not
1031 * used for management of the delete list. Using the same structure
1032 * for deleted items allows change reports to use common code with
1033 * non-deleted or query-response MCA's.
1034 */
0da974f4 1035 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1036 if (!pmc)
1037 return;
1da177e4
LT		 1038 spin_lock_bh(&im->lock);
1039 pmc->interface = im->interface;
1040 in_dev_hold(in_dev);
1041 pmc->multiaddr = im->multiaddr;
1042 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1043 IGMP_Unsolicited_Report_Count;
1044 pmc->sfmode = im->sfmode;
1045 if (pmc->sfmode == MCAST_INCLUDE) {
1046 struct ip_sf_list *psf;
1047
1048 pmc->tomb = im->tomb;
1049 pmc->sources = im->sources;
1050 im->tomb = im->sources = NULL;
1051 for (psf=pmc->sources; psf; psf=psf->sf_next)
1052 psf->sf_crcount = pmc->crcount;
1053 }
1054 spin_unlock_bh(&im->lock);
1055
1056 spin_lock_bh(&in_dev->mc_tomb_lock);
1057 pmc->next = in_dev->mc_tomb;
1058 in_dev->mc_tomb = pmc;
1059 spin_unlock_bh(&in_dev->mc_tomb_lock);
1060}
1061
63007727 1062static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1063{
1064 struct ip_mc_list *pmc, *pmc_prev;
1065 struct ip_sf_list *psf, *psf_next;
1066
1067 spin_lock_bh(&in_dev->mc_tomb_lock);
1068 pmc_prev = NULL;
1069 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1070 if (pmc->multiaddr == multiaddr)
1071 break;
1072 pmc_prev = pmc;
1073 }
1074 if (pmc) {
1075 if (pmc_prev)
1076 pmc_prev->next = pmc->next;
1077 else
1078 in_dev->mc_tomb = pmc->next;
1079 }
1080 spin_unlock_bh(&in_dev->mc_tomb_lock);
1081 if (pmc) {
1082 for (psf=pmc->tomb; psf; psf=psf_next) {
1083 psf_next = psf->sf_next;
1084 kfree(psf);
1085 }
1086 in_dev_put(pmc->interface);
1087 kfree(pmc);
1088 }
1089}
1090
1091static void igmpv3_clear_delrec(struct in_device *in_dev)
1092{
1093 struct ip_mc_list *pmc, *nextpmc;
1094
1095 spin_lock_bh(&in_dev->mc_tomb_lock);
1096 pmc = in_dev->mc_tomb;
1097 in_dev->mc_tomb = NULL;
1098 spin_unlock_bh(&in_dev->mc_tomb_lock);
1099
1100 for (; pmc; pmc = nextpmc) {
1101 nextpmc = pmc->next;
1102 ip_mc_clear_src(pmc);
1103 in_dev_put(pmc->interface);
1104 kfree(pmc);
1105 }
1106 /* clear dead sources, too */
1107 read_lock(&in_dev->mc_list_lock);
1108 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1109 struct ip_sf_list *psf, *psf_next;
1110
1111 spin_lock_bh(&pmc->lock);
1112 psf = pmc->tomb;
1113 pmc->tomb = NULL;
1114 spin_unlock_bh(&pmc->lock);
1115 for (; psf; psf=psf_next) {
1116 psf_next = psf->sf_next;
1117 kfree(psf);
1118 }
1119 }
1120 read_unlock(&in_dev->mc_list_lock);
1121}
1122#endif
1123
1124static void igmp_group_dropped(struct ip_mc_list *im)
1125{
1126 struct in_device *in_dev = im->interface;
1127#ifdef CONFIG_IP_MULTICAST
1128 int reporter;
1129#endif
1130
1131 if (im->loaded) {
1132 im->loaded = 0;
1133 ip_mc_filter_del(in_dev, im->multiaddr);
1134 }
1135
1136#ifdef CONFIG_IP_MULTICAST
1137 if (im->multiaddr == IGMP_ALL_HOSTS)
1138 return;
1139
1140 reporter = im->reporter;
1141 igmp_stop_timer(im);
1142
1143 if (!in_dev->dead) {
1144 if (IGMP_V1_SEEN(in_dev))
1145 goto done;
1146 if (IGMP_V2_SEEN(in_dev)) {
1147 if (reporter)
1148 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1149 goto done;
1150 }
1151 /* IGMPv3 */
1152 igmpv3_add_delrec(in_dev, im);
1153
1154 igmp_ifc_event(in_dev);
1155 }
1156done:
1157#endif
1158 ip_mc_clear_src(im);
1159}
1160
1161static void igmp_group_added(struct ip_mc_list *im)
1162{
1163 struct in_device *in_dev = im->interface;
1164
1165 if (im->loaded == 0) {
1166 im->loaded = 1;
1167 ip_mc_filter_add(in_dev, im->multiaddr);
1168 }
1169
1170#ifdef CONFIG_IP_MULTICAST
1171 if (im->multiaddr == IGMP_ALL_HOSTS)
1172 return;
1173
1174 if (in_dev->dead)
1175 return;
1176 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1177 spin_lock_bh(&im->lock);
1178 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1179 spin_unlock_bh(&im->lock);
1180 return;
1181 }
1182 /* else, v3 */
1183
1184 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1185 IGMP_Unsolicited_Report_Count;
1186 igmp_ifc_event(in_dev);
1187#endif
1188}
1189
1190
1191/*
1192 * Multicast list managers
1193 */
1194
1195
1196/*
1197 * A socket has joined a multicast group on device dev.
1198 */
1199
8f935bbd 1200void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1201{
1202 struct ip_mc_list *im;
1203
1204 ASSERT_RTNL();
1205
1206 for (im=in_dev->mc_list; im; im=im->next) {
1207 if (im->multiaddr == addr) {
1208 im->users++;
1209 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1210 goto out;
1211 }
1212 }
1213
8b3a7005 1214 im = kmalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1215 if (!im)
1216 goto out;
1217
1218 im->users=1;
1219 im->interface=in_dev;
1220 in_dev_hold(in_dev);
1221 im->multiaddr=addr;
1222 /* initial mode is (EX, empty) */
1223 im->sfmode = MCAST_EXCLUDE;
1224 im->sfcount[MCAST_INCLUDE] = 0;
1225 im->sfcount[MCAST_EXCLUDE] = 1;
1226 im->sources = NULL;
1227 im->tomb = NULL;
1228 im->crcount = 0;
1229 atomic_set(&im->refcnt, 1);
1230 spin_lock_init(&im->lock);
1231#ifdef CONFIG_IP_MULTICAST
1232 im->tm_running=0;
1233 init_timer(&im->timer);
1234 im->timer.data=(unsigned long)im;
1235 im->timer.function=&igmp_timer_expire;
1236 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1237 im->reporter = 0;
1238 im->gsquery = 0;
1239#endif
1240 im->loaded = 0;
1241 write_lock_bh(&in_dev->mc_list_lock);
1242 im->next=in_dev->mc_list;
1243 in_dev->mc_list=im;
1244 write_unlock_bh(&in_dev->mc_list_lock);
1245#ifdef CONFIG_IP_MULTICAST
1246 igmpv3_del_delrec(in_dev, im->multiaddr);
1247#endif
1248 igmp_group_added(im);
1249 if (!in_dev->dead)
1250 ip_rt_multicast_event(in_dev);
1251out:
1252 return;
1253}
1254
a816c7c7
JV		 1255/*
1256 * Resend IGMP JOIN report; used for bonding.
1257 */
1258void ip_mc_rejoin_group(struct ip_mc_list *im)
1259{
08882669 1260#ifdef CONFIG_IP_MULTICAST
a816c7c7
JV		 1261 struct in_device *in_dev = im->interface;
1262
a816c7c7
JV		 1263 if (im->multiaddr == IGMP_ALL_HOSTS)
1264 return;
1265
1266 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1267 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1268 return;
1269 }
1270 /* else, v3 */
1271 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1272 IGMP_Unsolicited_Report_Count;
1273 igmp_ifc_event(in_dev);
1274#endif
1275}
1276
1da177e4
LT		 1277/*
1278 * A socket has left a multicast group on device dev
1279 */
1280
8f935bbd 1281void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1282{
1283 struct ip_mc_list *i, **ip;
e905a9ed 1284
1da177e4 1285 ASSERT_RTNL();
e905a9ed 1286
1da177e4
LT		 1287 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1288 if (i->multiaddr==addr) {
1289 if (--i->users == 0) {
1290 write_lock_bh(&in_dev->mc_list_lock);
1291 *ip = i->next;
1292 write_unlock_bh(&in_dev->mc_list_lock);
1293 igmp_group_dropped(i);
1294
1295 if (!in_dev->dead)
1296 ip_rt_multicast_event(in_dev);
1297
1298 ip_ma_put(i);
1299 return;
1300 }
1301 break;
1302 }
1303 }
1304}
1305
1306/* Device going down */
1307
1308void ip_mc_down(struct in_device *in_dev)
1309{
1310 struct ip_mc_list *i;
1311
1312 ASSERT_RTNL();
1313
1314 for (i=in_dev->mc_list; i; i=i->next)
1315 igmp_group_dropped(i);
1316
1317#ifdef CONFIG_IP_MULTICAST
1318 in_dev->mr_ifc_count = 0;
1319 if (del_timer(&in_dev->mr_ifc_timer))
1320 __in_dev_put(in_dev);
1321 in_dev->mr_gq_running = 0;
1322 if (del_timer(&in_dev->mr_gq_timer))
1323 __in_dev_put(in_dev);
1324 igmpv3_clear_delrec(in_dev);
1325#endif
1326
1327 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1328}
1329
1330void ip_mc_init_dev(struct in_device *in_dev)
1331{
1332 ASSERT_RTNL();
1333
1334 in_dev->mc_tomb = NULL;
1335#ifdef CONFIG_IP_MULTICAST
1336 in_dev->mr_gq_running = 0;
1337 init_timer(&in_dev->mr_gq_timer);
1338 in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1339 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1340 in_dev->mr_ifc_count = 0;
1341 init_timer(&in_dev->mr_ifc_timer);
1342 in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1343 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1344 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1345#endif
1346
1347 rwlock_init(&in_dev->mc_list_lock);
1348 spin_lock_init(&in_dev->mc_tomb_lock);
1349}
1350
1351/* Device going up */
1352
1353void ip_mc_up(struct in_device *in_dev)
1354{
1355 struct ip_mc_list *i;
1356
1357 ASSERT_RTNL();
1358
1359 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1360
1361 for (i=in_dev->mc_list; i; i=i->next)
1362 igmp_group_added(i);
1363}
1364
1365/*
1366 * Device is about to be destroyed: clean up.
1367 */
1368
1369void ip_mc_destroy_dev(struct in_device *in_dev)
1370{
1371 struct ip_mc_list *i;
1372
1373 ASSERT_RTNL();
1374
1375 /* Deactivate timers */
1376 ip_mc_down(in_dev);
1377
1378 write_lock_bh(&in_dev->mc_list_lock);
1379 while ((i = in_dev->mc_list) != NULL) {
1380 in_dev->mc_list = i->next;
1381 write_unlock_bh(&in_dev->mc_list_lock);
1382
1383 igmp_group_dropped(i);
1384 ip_ma_put(i);
1385
1386 write_lock_bh(&in_dev->mc_list_lock);
1387 }
1388 write_unlock_bh(&in_dev->mc_list_lock);
1389}
1390
1391static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1392{
1393 struct flowi fl = { .nl_u = { .ip4_u =
1394 { .daddr = imr->imr_multiaddr.s_addr } } };
1395 struct rtable *rt;
1396 struct net_device *dev = NULL;
1397 struct in_device *idev = NULL;
1398
1399 if (imr->imr_ifindex) {
1400 idev = inetdev_by_index(imr->imr_ifindex);
1401 if (idev)
1402 __in_dev_put(idev);
1403 return idev;
1404 }
1405 if (imr->imr_address.s_addr) {
1406 dev = ip_dev_find(imr->imr_address.s_addr);
1407 if (!dev)
1408 return NULL;
15333061 1409 dev_put(dev);
1da177e4
LT		 1410 }
1411
1412 if (!dev && !ip_route_output_key(&rt, &fl)) {
1413 dev = rt->u.dst.dev;
1414 ip_rt_put(rt);
1415 }
1416 if (dev) {
1417 imr->imr_ifindex = dev->ifindex;
e5ed6399 1418 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1419 }
1420 return idev;
1421}
1422
1423/*
1424 * Join a socket to a group
1425 */
ab32ea5d
BH		 1426int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1427int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1da177e4
LT		 1428
1429
1430static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1431 __be32 *psfsrc)
1da177e4
LT		 1432{
1433 struct ip_sf_list *psf, *psf_prev;
1434 int rv = 0;
1435
1436 psf_prev = NULL;
1437 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1438 if (psf->sf_inaddr == *psfsrc)
1439 break;
1440 psf_prev = psf;
1441 }
1442 if (!psf || psf->sf_count[sfmode] == 0) {
1443 /* source filter not found, or count wrong => bug */
1444 return -ESRCH;
1445 }
1446 psf->sf_count[sfmode]--;
1447 if (psf->sf_count[sfmode] == 0) {
1448 ip_rt_multicast_event(pmc->interface);
1449 }
1450 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1451#ifdef CONFIG_IP_MULTICAST
1452 struct in_device *in_dev = pmc->interface;
1453#endif
1454
1455 /* no more filters for this source */
1456 if (psf_prev)
1457 psf_prev->sf_next = psf->sf_next;
1458 else
1459 pmc->sources = psf->sf_next;
1460#ifdef CONFIG_IP_MULTICAST
1461 if (psf->sf_oldin &&
1462 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
e905a9ed 1463 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1464 IGMP_Unsolicited_Report_Count;
1465 psf->sf_next = pmc->tomb;
1466 pmc->tomb = psf;
1467 rv = 1;
1468 } else
1469#endif
1470 kfree(psf);
1471 }
1472 return rv;
1473}
1474
1475#ifndef CONFIG_IP_MULTICAST
1476#define igmp_ifc_event(x) do { } while (0)
1477#endif
1478
8f935bbd
AV		 1479static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1480 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1481{
1482 struct ip_mc_list *pmc;
1483 int changerec = 0;
1484 int i, err;
1485
1486 if (!in_dev)
1487 return -ENODEV;
1488 read_lock(&in_dev->mc_list_lock);
1489 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1490 if (*pmca == pmc->multiaddr)
1491 break;
1492 }
1493 if (!pmc) {
1494 /* MCA not found?? bug */
1495 read_unlock(&in_dev->mc_list_lock);
1496 return -ESRCH;
1497 }
1498 spin_lock_bh(&pmc->lock);
1499 read_unlock(&in_dev->mc_list_lock);
1500#ifdef CONFIG_IP_MULTICAST
1501 sf_markstate(pmc);
1502#endif
1503 if (!delta) {
1504 err = -EINVAL;
1505 if (!pmc->sfcount[sfmode])
1506 goto out_unlock;
1507 pmc->sfcount[sfmode]--;
1508 }
1509 err = 0;
1510 for (i=0; i<sfcount; i++) {
1511 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1512
1513 changerec |= rv > 0;
1514 if (!err && rv < 0)
1515 err = rv;
1516 }
1517 if (pmc->sfmode == MCAST_EXCLUDE &&
1518 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1519 pmc->sfcount[MCAST_INCLUDE]) {
1520#ifdef CONFIG_IP_MULTICAST
1521 struct ip_sf_list *psf;
1522#endif
1523
1524 /* filter mode change */
1525 pmc->sfmode = MCAST_INCLUDE;
1526#ifdef CONFIG_IP_MULTICAST
e905a9ed 1527 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1528 IGMP_Unsolicited_Report_Count;
1529 in_dev->mr_ifc_count = pmc->crcount;
1530 for (psf=pmc->sources; psf; psf = psf->sf_next)
1531 psf->sf_crcount = 0;
1532 igmp_ifc_event(pmc->interface);
1533 } else if (sf_setstate(pmc) || changerec) {
1534 igmp_ifc_event(pmc->interface);
1535#endif
1536 }
1537out_unlock:
1538 spin_unlock_bh(&pmc->lock);
1539 return err;
1540}
1541
1542/*
1543 * Add multicast single-source filter to the interface list
1544 */
1545static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1546 __be32 *psfsrc, int delta)
1da177e4
LT		 1547{
1548 struct ip_sf_list *psf, *psf_prev;
1549
1550 psf_prev = NULL;
1551 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1552 if (psf->sf_inaddr == *psfsrc)
1553 break;
1554 psf_prev = psf;
1555 }
1556 if (!psf) {
0da974f4 1557 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1558 if (!psf)
1559 return -ENOBUFS;
1da177e4
LT		 1560 psf->sf_inaddr = *psfsrc;
1561 if (psf_prev) {
1562 psf_prev->sf_next = psf;
1563 } else
1564 pmc->sources = psf;
1565 }
1566 psf->sf_count[sfmode]++;
1567 if (psf->sf_count[sfmode] == 1) {
1568 ip_rt_multicast_event(pmc->interface);
1569 }
1570 return 0;
1571}
1572
1573#ifdef CONFIG_IP_MULTICAST
1574static void sf_markstate(struct ip_mc_list *pmc)
1575{
1576 struct ip_sf_list *psf;
1577 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1578
1579 for (psf=pmc->sources; psf; psf=psf->sf_next)
1580 if (pmc->sfcount[MCAST_EXCLUDE]) {
1581 psf->sf_oldin = mca_xcount ==
1582 psf->sf_count[MCAST_EXCLUDE] &&
1583 !psf->sf_count[MCAST_INCLUDE];
1584 } else
1585 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1586}
1587
1588static int sf_setstate(struct ip_mc_list *pmc)
1589{
ad12583f 1590 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1591 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1592 int qrv = pmc->interface->mr_qrv;
1593 int new_in, rv;
1594
1595 rv = 0;
1596 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1597 if (pmc->sfcount[MCAST_EXCLUDE]) {
1598 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1599 !psf->sf_count[MCAST_INCLUDE];
1600 } else
1601 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1602 if (new_in) {
1603 if (!psf->sf_oldin) {
76edc605 1604 struct ip_sf_list *prev = NULL;
ad12583f
DS		 1605
1606 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1607 if (dpsf->sf_inaddr == psf->sf_inaddr)
1608 break;
1609 prev = dpsf;
1610 }
1611 if (dpsf) {
1612 if (prev)
1613 prev->sf_next = dpsf->sf_next;
1614 else
1615 pmc->tomb = dpsf->sf_next;
1616 kfree(dpsf);
1617 }
1618 psf->sf_crcount = qrv;
1619 rv++;
1620 }
1621 } else if (psf->sf_oldin) {
1622
1623 psf->sf_crcount = 0;
1624 /*
1625 * add or update "delete" records if an active filter
1626 * is now inactive
1627 */
1628 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1629 if (dpsf->sf_inaddr == psf->sf_inaddr)
1630 break;
1631 if (!dpsf) {
1632 dpsf = (struct ip_sf_list *)
1633 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1634 if (!dpsf)
1635 continue;
1636 *dpsf = *psf;
1637 /* pmc->lock held by callers */
1638 dpsf->sf_next = pmc->tomb;
1639 pmc->tomb = dpsf;
1640 }
1641 dpsf->sf_crcount = qrv;
1da177e4
LT		 1642 rv++;
1643 }
1644 }
1645 return rv;
1646}
1647#endif
1648
1649/*
1650 * Add multicast source filter list to the interface list
1651 */
8f935bbd
AV		 1652static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1653 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1654{
1655 struct ip_mc_list *pmc;
1656 int isexclude;
1657 int i, err;
1658
1659 if (!in_dev)
1660 return -ENODEV;
1661 read_lock(&in_dev->mc_list_lock);
1662 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1663 if (*pmca == pmc->multiaddr)
1664 break;
1665 }
1666 if (!pmc) {
1667 /* MCA not found?? bug */
1668 read_unlock(&in_dev->mc_list_lock);
1669 return -ESRCH;
1670 }
1671 spin_lock_bh(&pmc->lock);
1672 read_unlock(&in_dev->mc_list_lock);
1673
1674#ifdef CONFIG_IP_MULTICAST
1675 sf_markstate(pmc);
1676#endif
1677 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1678 if (!delta)
1679 pmc->sfcount[sfmode]++;
1680 err = 0;
1681 for (i=0; i<sfcount; i++) {
1682 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1683 if (err)
1684 break;
1685 }
1686 if (err) {
1687 int j;
1688
1689 pmc->sfcount[sfmode]--;
1690 for (j=0; j<i; j++)
1691 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1692 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1693#ifdef CONFIG_IP_MULTICAST
1694 struct in_device *in_dev = pmc->interface;
1695 struct ip_sf_list *psf;
1696#endif
1697
1698 /* filter mode change */
1699 if (pmc->sfcount[MCAST_EXCLUDE])
1700 pmc->sfmode = MCAST_EXCLUDE;
1701 else if (pmc->sfcount[MCAST_INCLUDE])
1702 pmc->sfmode = MCAST_INCLUDE;
1703#ifdef CONFIG_IP_MULTICAST
1704 /* else no filters; keep old mode for reports */
1705
e905a9ed 1706 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1707 IGMP_Unsolicited_Report_Count;
1708 in_dev->mr_ifc_count = pmc->crcount;
1709 for (psf=pmc->sources; psf; psf = psf->sf_next)
1710 psf->sf_crcount = 0;
1711 igmp_ifc_event(in_dev);
1712 } else if (sf_setstate(pmc)) {
1713 igmp_ifc_event(in_dev);
1714#endif
1715 }
1716 spin_unlock_bh(&pmc->lock);
1717 return err;
1718}
1719
1720static void ip_mc_clear_src(struct ip_mc_list *pmc)
1721{
1722 struct ip_sf_list *psf, *nextpsf;
1723
1724 for (psf=pmc->tomb; psf; psf=nextpsf) {
1725 nextpsf = psf->sf_next;
1726 kfree(psf);
1727 }
1728 pmc->tomb = NULL;
1729 for (psf=pmc->sources; psf; psf=nextpsf) {
1730 nextpsf = psf->sf_next;
1731 kfree(psf);
1732 }
1733 pmc->sources = NULL;
1734 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1735 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1736 pmc->sfcount[MCAST_EXCLUDE] = 1;
1737}
1738
1739
1740/*
1741 * Join a multicast group
1742 */
1743int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1744{
1745 int err;
8f935bbd 1746 __be32 addr = imr->imr_multiaddr.s_addr;
ca9b907d 1747 struct ip_mc_socklist *iml=NULL, *i;
1da177e4
LT		 1748 struct in_device *in_dev;
1749 struct inet_sock *inet = inet_sk(sk);
ca9b907d 1750 int ifindex;
1da177e4
LT		 1751 int count = 0;
1752
1753 if (!MULTICAST(addr))
1754 return -EINVAL;
1755
6756ae4b 1756 rtnl_lock();
1da177e4
LT		 1757
1758 in_dev = ip_mc_find_dev(imr);
1759
1760 if (!in_dev) {
1761 iml = NULL;
1762 err = -ENODEV;
1763 goto done;
1764 }
1765
1da177e4 1766 err = -EADDRINUSE;
ca9b907d 1767 ifindex = imr->imr_ifindex;
1da177e4 1768 for (i = inet->mc_list; i; i = i->next) {
ca9b907d
DS		 1769 if (i->multi.imr_multiaddr.s_addr == addr &&
1770 i->multi.imr_ifindex == ifindex)
1da177e4 1771 goto done;
1da177e4
LT		 1772 count++;
1773 }
1774 err = -ENOBUFS;
ca9b907d
DS		 1775 if (count >= sysctl_igmp_max_memberships)
1776 goto done;
8b3a7005 1777 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
ca9b907d 1778 if (iml == NULL)
1da177e4 1779 goto done;
ca9b907d 1780
1da177e4
LT		 1781 memcpy(&iml->multi, imr, sizeof(*imr));
1782 iml->next = inet->mc_list;
1da177e4
LT		 1783 iml->sflist = NULL;
1784 iml->sfmode = MCAST_EXCLUDE;
1785 inet->mc_list = iml;
1786 ip_mc_inc_group(in_dev, addr);
1da177e4 1787 err = 0;
1da177e4 1788done:
6756ae4b 1789 rtnl_unlock();
1da177e4
LT		 1790 return err;
1791}
1792
1793static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1794 struct in_device *in_dev)
1795{
1796 int err;
1797
1798 if (iml->sflist == 0) {
1799 /* any-source empty exclude case */
1800 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1801 iml->sfmode, 0, NULL, 0);
1802 }
1803 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1804 iml->sfmode, iml->sflist->sl_count,
1805 iml->sflist->sl_addr, 0);
1806 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1807 iml->sflist = NULL;
1808 return err;
1809}
1810
1811/*
1812 * Ask a socket to leave a group.
1813 */
1814
1815int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1816{
1817 struct inet_sock *inet = inet_sk(sk);
1818 struct ip_mc_socklist *iml, **imlp;
84b42bae 1819 struct in_device *in_dev;
8f935bbd 1820 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1821 u32 ifindex;
acd6e00b 1822 int ret = -EADDRNOTAVAIL;
1da177e4
LT		 1823
1824 rtnl_lock();
84b42bae 1825 in_dev = ip_mc_find_dev(imr);
84b42bae 1826 ifindex = imr->imr_ifindex;
1da177e4 1827 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
acd6e00b
DS		 1828 if (iml->multi.imr_multiaddr.s_addr != group)
1829 continue;
1830 if (ifindex) {
1831 if (iml->multi.imr_ifindex != ifindex)
1832 continue;
1833 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1834 iml->multi.imr_address.s_addr)
1835 continue;
1da177e4 1836
acd6e00b 1837 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4 1838
acd6e00b
DS		 1839 *imlp = iml->next;
1840
1841 if (in_dev)
84b42bae 1842 ip_mc_dec_group(in_dev, group);
acd6e00b
DS		 1843 rtnl_unlock();
1844 sock_kfree_s(sk, iml, sizeof(*iml));
1845 return 0;
1da177e4 1846 }
acd6e00b
DS		 1847 if (!in_dev)
1848 ret = -ENODEV;
1da177e4 1849 rtnl_unlock();
acd6e00b 1850 return ret;
1da177e4
LT		 1851}
1852
1853int ip_mc_source(int add, int omode, struct sock *sk, struct
1854 ip_mreq_source *mreqs, int ifindex)
1855{
1856 int err;
1857 struct ip_mreqn imr;
63007727 1858 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 1859 struct ip_mc_socklist *pmc;
1860 struct in_device *in_dev = NULL;
1861 struct inet_sock *inet = inet_sk(sk);
1862 struct ip_sf_socklist *psl;
8cdaaa15 1863 int leavegroup = 0;
1da177e4
LT		 1864 int i, j, rv;
1865
1866 if (!MULTICAST(addr))
1867 return -EINVAL;
1868
6756ae4b 1869 rtnl_lock();
1da177e4
LT		 1870
1871 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1872 imr.imr_address.s_addr = mreqs->imr_interface;
1873 imr.imr_ifindex = ifindex;
1874 in_dev = ip_mc_find_dev(&imr);
1875
1876 if (!in_dev) {
1877 err = -ENODEV;
1878 goto done;
1879 }
1880 err = -EADDRNOTAVAIL;
1881
1882 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
ca9b907d
DS		 1883 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1884 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1da177e4
LT		 1885 break;
1886 }
917f2f10
DS		 1887 if (!pmc) { /* must have a prior join */
1888 err = -EINVAL;
1da177e4 1889 goto done;
917f2f10 1890 }
1da177e4
LT		 1891 /* if a source filter was set, must be the same mode as before */
1892 if (pmc->sflist) {
917f2f10
DS		 1893 if (pmc->sfmode != omode) {
1894 err = -EINVAL;
1da177e4 1895 goto done;
917f2f10 1896 }
1da177e4
LT		 1897 } else if (pmc->sfmode != omode) {
1898 /* allow mode switches for empty-set filters */
1899 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 1900 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 1901 NULL, 0);
1902 pmc->sfmode = omode;
1903 }
1904
1905 psl = pmc->sflist;
1906 if (!add) {
1907 if (!psl)
917f2f10 1908 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1909 rv = !0;
1910 for (i=0; i<psl->sl_count; i++) {
1911 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1912 sizeof(__be32));
1da177e4
LT		 1913 if (rv == 0)
1914 break;
1915 }
1916 if (rv) /* source not found */
917f2f10 1917 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1918
8cdaaa15
DS		 1919 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1920 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1921 leavegroup = 1;
1922 goto done;
1923 }
1924
1da177e4 1925 /* update the interface filter */
e905a9ed 1926 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1927 &mreqs->imr_sourceaddr, 1);
1928
1929 for (j=i+1; j<psl->sl_count; j++)
1930 psl->sl_addr[j-1] = psl->sl_addr[j];
1931 psl->sl_count--;
1932 err = 0;
1933 goto done;
1934 }
1935 /* else, add a new source to the filter */
1936
1937 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1938 err = -ENOBUFS;
1939 goto done;
1940 }
1941 if (!psl || psl->sl_count == psl->sl_max) {
1942 struct ip_sf_socklist *newpsl;
1943 int count = IP_SFBLOCK;
1944
1945 if (psl)
1946 count += psl->sl_max;
8b3a7005 1947 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 1948 if (!newpsl) {
1949 err = -ENOBUFS;
1950 goto done;
1951 }
1952 newpsl->sl_max = count;
1953 newpsl->sl_count = count - IP_SFBLOCK;
1954 if (psl) {
1955 for (i=0; i<psl->sl_count; i++)
1956 newpsl->sl_addr[i] = psl->sl_addr[i];
1957 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1958 }
1959 pmc->sflist = psl = newpsl;
1960 }
1961 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1962 for (i=0; i<psl->sl_count; i++) {
1963 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1964 sizeof(__be32));
1da177e4
LT		 1965 if (rv == 0)
1966 break;
1967 }
1968 if (rv == 0) /* address already there is an error */
1969 goto done;
1970 for (j=psl->sl_count-1; j>=i; j--)
1971 psl->sl_addr[j+1] = psl->sl_addr[j];
1972 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1973 psl->sl_count++;
1974 err = 0;
1975 /* update the interface list */
e905a9ed 1976 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1977 &mreqs->imr_sourceaddr, 1);
1978done:
6756ae4b 1979 rtnl_unlock();
8cdaaa15
DS		 1980 if (leavegroup)
1981 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 1982 return err;
1983}
1984
1985int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1986{
9951f036 1987 int err = 0;
1da177e4 1988 struct ip_mreqn imr;
63007727 1989 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 1990 struct ip_mc_socklist *pmc;
1991 struct in_device *in_dev;
1992 struct inet_sock *inet = inet_sk(sk);
1993 struct ip_sf_socklist *newpsl, *psl;
9951f036 1994 int leavegroup = 0;
1da177e4
LT		 1995
1996 if (!MULTICAST(addr))
1997 return -EINVAL;
1998 if (msf->imsf_fmode != MCAST_INCLUDE &&
1999 msf->imsf_fmode != MCAST_EXCLUDE)
2000 return -EINVAL;
2001
6756ae4b 2002 rtnl_lock();
1da177e4
LT		 2003
2004 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2005 imr.imr_address.s_addr = msf->imsf_interface;
2006 imr.imr_ifindex = ifindex;
2007 in_dev = ip_mc_find_dev(&imr);
2008
2009 if (!in_dev) {
2010 err = -ENODEV;
2011 goto done;
2012 }
1da177e4 2013
9951f036
DS		 2014 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2015 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2016 leavegroup = 1;
2017 goto done;
2018 }
2019
1da177e4
LT		 2020 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2021 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2022 pmc->multi.imr_ifindex == imr.imr_ifindex)
2023 break;
2024 }
917f2f10
DS		 2025 if (!pmc) { /* must have a prior join */
2026 err = -EINVAL;
1da177e4 2027 goto done;
917f2f10 2028 }
1da177e4 2029 if (msf->imsf_numsrc) {
8b3a7005
KK		 2030 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2031 GFP_KERNEL);
1da177e4
LT		 2032 if (!newpsl) {
2033 err = -ENOBUFS;
2034 goto done;
2035 }
2036 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2037 memcpy(newpsl->sl_addr, msf->imsf_slist,
2038 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2039 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2040 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2041 if (err) {
2042 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2043 goto done;
2044 }
8713dbf0 2045 } else {
1da177e4 2046 newpsl = NULL;
8713dbf0
YZ		 2047 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2048 msf->imsf_fmode, 0, NULL, 0);
2049 }
1da177e4
LT		 2050 psl = pmc->sflist;
2051 if (psl) {
2052 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2053 psl->sl_count, psl->sl_addr, 0);
2054 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2055 } else
2056 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2057 0, NULL, 0);
2058 pmc->sflist = newpsl;
2059 pmc->sfmode = msf->imsf_fmode;
917f2f10 2060 err = 0;
1da177e4 2061done:
6756ae4b 2062 rtnl_unlock();
9951f036
DS		 2063 if (leavegroup)
2064 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2065 return err;
2066}
2067
2068int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2069 struct ip_msfilter __user *optval, int __user *optlen)
2070{
2071 int err, len, count, copycount;
2072 struct ip_mreqn imr;
63007727 2073 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2074 struct ip_mc_socklist *pmc;
2075 struct in_device *in_dev;
2076 struct inet_sock *inet = inet_sk(sk);
2077 struct ip_sf_socklist *psl;
2078
2079 if (!MULTICAST(addr))
2080 return -EINVAL;
2081
6756ae4b 2082 rtnl_lock();
1da177e4
LT		 2083
2084 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2085 imr.imr_address.s_addr = msf->imsf_interface;
2086 imr.imr_ifindex = 0;
2087 in_dev = ip_mc_find_dev(&imr);
2088
2089 if (!in_dev) {
2090 err = -ENODEV;
2091 goto done;
2092 }
2093 err = -EADDRNOTAVAIL;
2094
2095 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2096 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2097 pmc->multi.imr_ifindex == imr.imr_ifindex)
2098 break;
2099 }
2100 if (!pmc) /* must have a prior join */
2101 goto done;
2102 msf->imsf_fmode = pmc->sfmode;
2103 psl = pmc->sflist;
6756ae4b 2104 rtnl_unlock();
1da177e4
LT		 2105 if (!psl) {
2106 len = 0;
2107 count = 0;
2108 } else {
2109 count = psl->sl_count;
2110 }
2111 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2112 len = copycount * sizeof(psl->sl_addr[0]);
2113 msf->imsf_numsrc = count;
2114 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2115 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2116 return -EFAULT;
2117 }
2118 if (len &&
2119 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2120 return -EFAULT;
2121 return 0;
2122done:
6756ae4b 2123 rtnl_unlock();
1da177e4
LT		 2124 return err;
2125}
2126
2127int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2128 struct group_filter __user *optval, int __user *optlen)
2129{
2130 int err, i, count, copycount;
2131 struct sockaddr_in *psin;
63007727 2132 __be32 addr;
1da177e4
LT		 2133 struct ip_mc_socklist *pmc;
2134 struct inet_sock *inet = inet_sk(sk);
2135 struct ip_sf_socklist *psl;
2136
2137 psin = (struct sockaddr_in *)&gsf->gf_group;
2138 if (psin->sin_family != AF_INET)
2139 return -EINVAL;
2140 addr = psin->sin_addr.s_addr;
2141 if (!MULTICAST(addr))
2142 return -EINVAL;
2143
6756ae4b 2144 rtnl_lock();
1da177e4
LT		 2145
2146 err = -EADDRNOTAVAIL;
2147
2148 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2149 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2150 pmc->multi.imr_ifindex == gsf->gf_interface)
2151 break;
2152 }
2153 if (!pmc) /* must have a prior join */
2154 goto done;
2155 gsf->gf_fmode = pmc->sfmode;
2156 psl = pmc->sflist;
6756ae4b 2157 rtnl_unlock();
1da177e4
LT		 2158 count = psl ? psl->sl_count : 0;
2159 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2160 gsf->gf_numsrc = count;
2161 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2162 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2163 return -EFAULT;
2164 }
2165 for (i=0; i<copycount; i++) {
2166 struct sockaddr_in *psin;
2167 struct sockaddr_storage ss;
2168
2169 psin = (struct sockaddr_in *)&ss;
2170 memset(&ss, 0, sizeof(ss));
2171 psin->sin_family = AF_INET;
2172 psin->sin_addr.s_addr = psl->sl_addr[i];
2173 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2174 return -EFAULT;
2175 }
2176 return 0;
2177done:
6756ae4b 2178 rtnl_unlock();
1da177e4
LT		 2179 return err;
2180}
2181
2182/*
2183 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2184 */
c0cda068 2185int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2186{
2187 struct inet_sock *inet = inet_sk(sk);
2188 struct ip_mc_socklist *pmc;
2189 struct ip_sf_socklist *psl;
2190 int i;
2191
2192 if (!MULTICAST(loc_addr))
2193 return 1;
2194
2195 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2196 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2197 pmc->multi.imr_ifindex == dif)
2198 break;
2199 }
2200 if (!pmc)
2201 return 1;
2202 psl = pmc->sflist;
2203 if (!psl)
2204 return pmc->sfmode == MCAST_EXCLUDE;
2205
2206 for (i=0; i<psl->sl_count; i++) {
2207 if (psl->sl_addr[i] == rmt_addr)
2208 break;
2209 }
2210 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2211 return 0;
2212 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2213 return 0;
2214 return 1;
2215}
2216
2217/*
2218 * A socket is closing.
2219 */
2220
2221void ip_mc_drop_socket(struct sock *sk)
2222{
2223 struct inet_sock *inet = inet_sk(sk);
2224 struct ip_mc_socklist *iml;
2225
2226 if (inet->mc_list == NULL)
2227 return;
2228
2229 rtnl_lock();
2230 while ((iml = inet->mc_list) != NULL) {
2231 struct in_device *in_dev;
2232 inet->mc_list = iml->next;
2233
bb699cbc
MR		 2234 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
2235 (void) ip_mc_leave_src(sk, iml, in_dev);
2236 if (in_dev != NULL) {
1da177e4
LT		 2237 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2238 in_dev_put(in_dev);
2239 }
2240 sock_kfree_s(sk, iml, sizeof(*iml));
1da177e4
LT		 2241 }
2242 rtnl_unlock();
2243}
2244
a60c4923 2245int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2246{
2247 struct ip_mc_list *im;
2248 struct ip_sf_list *psf;
2249 int rv = 0;
2250
2251 read_lock(&in_dev->mc_list_lock);
2252 for (im=in_dev->mc_list; im; im=im->next) {
2253 if (im->multiaddr == mc_addr)
2254 break;
2255 }
2256 if (im && proto == IPPROTO_IGMP) {
2257 rv = 1;
2258 } else if (im) {
2259 if (src_addr) {
2260 for (psf=im->sources; psf; psf=psf->sf_next) {
2261 if (psf->sf_inaddr == src_addr)
2262 break;
2263 }
2264 if (psf)
2265 rv = psf->sf_count[MCAST_INCLUDE] ||
2266 psf->sf_count[MCAST_EXCLUDE] !=
2267 im->sfcount[MCAST_EXCLUDE];
2268 else
2269 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2270 } else
2271 rv = 1; /* unspecified source; tentatively allow */
2272 }
2273 read_unlock(&in_dev->mc_list_lock);
2274 return rv;
2275}
2276
2277#if defined(CONFIG_PROC_FS)
2278struct igmp_mc_iter_state {
2279 struct net_device *dev;
2280 struct in_device *in_dev;
2281};
2282
2283#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2284
2285static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2286{
2287 struct ip_mc_list *im = NULL;
2288 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2289
2290 for (state->dev = dev_base, state->in_dev = NULL;
e905a9ed 2291 state->dev;
1da177e4
LT		 2292 state->dev = state->dev->next) {
2293 struct in_device *in_dev;
2294 in_dev = in_dev_get(state->dev);
2295 if (!in_dev)
2296 continue;
2297 read_lock(&in_dev->mc_list_lock);
2298 im = in_dev->mc_list;
2299 if (im) {
2300 state->in_dev = in_dev;
2301 break;
2302 }
2303 read_unlock(&in_dev->mc_list_lock);
2304 in_dev_put(in_dev);
2305 }
2306 return im;
2307}
2308
2309static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2310{
2311 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2312 im = im->next;
2313 while (!im) {
2314 if (likely(state->in_dev != NULL)) {
2315 read_unlock(&state->in_dev->mc_list_lock);
2316 in_dev_put(state->in_dev);
2317 }
2318 state->dev = state->dev->next;
2319 if (!state->dev) {
2320 state->in_dev = NULL;
2321 break;
2322 }
2323 state->in_dev = in_dev_get(state->dev);
2324 if (!state->in_dev)
2325 continue;
2326 read_lock(&state->in_dev->mc_list_lock);
2327 im = state->in_dev->mc_list;
2328 }
2329 return im;
2330}
2331
2332static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2333{
2334 struct ip_mc_list *im = igmp_mc_get_first(seq);
2335 if (im)
2336 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2337 --pos;
2338 return pos ? NULL : im;
2339}
2340
2341static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2342{
2343 read_lock(&dev_base_lock);
2344 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2345}
2346
2347static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2348{
2349 struct ip_mc_list *im;
2350 if (v == SEQ_START_TOKEN)
2351 im = igmp_mc_get_first(seq);
2352 else
2353 im = igmp_mc_get_next(seq, v);
2354 ++*pos;
2355 return im;
2356}
2357
2358static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2359{
2360 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2361 if (likely(state->in_dev != NULL)) {
2362 read_unlock(&state->in_dev->mc_list_lock);
2363 in_dev_put(state->in_dev);
2364 state->in_dev = NULL;
2365 }
2366 state->dev = NULL;
2367 read_unlock(&dev_base_lock);
2368}
2369
2370static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2371{
2372 if (v == SEQ_START_TOKEN)
e905a9ed 2373 seq_puts(seq,
1da177e4
LT		 2374 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2375 else {
2376 struct ip_mc_list *im = (struct ip_mc_list *)v;
2377 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2378 char *querier;
2379#ifdef CONFIG_IP_MULTICAST
2380 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2381 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2382 "V3";
2383#else
2384 querier = "NONE";
2385#endif
2386
2387 if (state->in_dev->mc_list == im) {
2388 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2389 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2390 }
2391
2392 seq_printf(seq,
338fcf98 2393 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4
LT		 2394 im->multiaddr, im->users,
2395 im->tm_running, im->tm_running ?
2396 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2397 im->reporter);
2398 }
2399 return 0;
2400}
2401
f690808e 2402static const struct seq_operations igmp_mc_seq_ops = {
1da177e4
LT		 2403 .start = igmp_mc_seq_start,
2404 .next = igmp_mc_seq_next,
2405 .stop = igmp_mc_seq_stop,
2406 .show = igmp_mc_seq_show,
2407};
2408
2409static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2410{
2411 struct seq_file *seq;
2412 int rc = -ENOMEM;
0da974f4 2413 struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2414
2415 if (!s)
2416 goto out;
2417 rc = seq_open(file, &igmp_mc_seq_ops);
2418 if (rc)
2419 goto out_kfree;
2420
2421 seq = file->private_data;
2422 seq->private = s;
1da177e4
LT		 2423out:
2424 return rc;
2425out_kfree:
2426 kfree(s);
2427 goto out;
2428}
2429
9a32144e 2430static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2431 .owner = THIS_MODULE,
2432 .open = igmp_mc_seq_open,
2433 .read = seq_read,
2434 .llseek = seq_lseek,
2435 .release = seq_release_private,
2436};
2437
2438struct igmp_mcf_iter_state {
2439 struct net_device *dev;
2440 struct in_device *idev;
2441 struct ip_mc_list *im;
2442};
2443
2444#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2445
2446static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2447{
2448 struct ip_sf_list *psf = NULL;
2449 struct ip_mc_list *im = NULL;
2450 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2451
2452 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
e905a9ed 2453 state->dev;
1da177e4
LT		 2454 state->dev = state->dev->next) {
2455 struct in_device *idev;
2456 idev = in_dev_get(state->dev);
2457 if (unlikely(idev == NULL))
2458 continue;
2459 read_lock(&idev->mc_list_lock);
2460 im = idev->mc_list;
2461 if (likely(im != NULL)) {
2462 spin_lock_bh(&im->lock);
2463 psf = im->sources;
2464 if (likely(psf != NULL)) {
2465 state->im = im;
2466 state->idev = idev;
2467 break;
2468 }
2469 spin_unlock_bh(&im->lock);
2470 }
2471 read_unlock(&idev->mc_list_lock);
2472 in_dev_put(idev);
2473 }
2474 return psf;
2475}
2476
2477static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2478{
2479 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2480
2481 psf = psf->sf_next;
2482 while (!psf) {
2483 spin_unlock_bh(&state->im->lock);
2484 state->im = state->im->next;
2485 while (!state->im) {
2486 if (likely(state->idev != NULL)) {
2487 read_unlock(&state->idev->mc_list_lock);
2488 in_dev_put(state->idev);
2489 }
2490 state->dev = state->dev->next;
2491 if (!state->dev) {
2492 state->idev = NULL;
2493 goto out;
2494 }
2495 state->idev = in_dev_get(state->dev);
2496 if (!state->idev)
2497 continue;
2498 read_lock(&state->idev->mc_list_lock);
2499 state->im = state->idev->mc_list;
2500 }
2501 if (!state->im)
2502 break;
2503 spin_lock_bh(&state->im->lock);
2504 psf = state->im->sources;
2505 }
2506out:
2507 return psf;
2508}
2509
2510static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2511{
2512 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2513 if (psf)
2514 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2515 --pos;
2516 return pos ? NULL : psf;
2517}
2518
2519static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2520{
2521 read_lock(&dev_base_lock);
2522 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2523}
2524
2525static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2526{
2527 struct ip_sf_list *psf;
2528 if (v == SEQ_START_TOKEN)
2529 psf = igmp_mcf_get_first(seq);
2530 else
2531 psf = igmp_mcf_get_next(seq, v);
2532 ++*pos;
2533 return psf;
2534}
2535
2536static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2537{
2538 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2539 if (likely(state->im != NULL)) {
2540 spin_unlock_bh(&state->im->lock);
2541 state->im = NULL;
2542 }
2543 if (likely(state->idev != NULL)) {
2544 read_unlock(&state->idev->mc_list_lock);
2545 in_dev_put(state->idev);
2546 state->idev = NULL;
2547 }
2548 state->dev = NULL;
2549 read_unlock(&dev_base_lock);
2550}
2551
2552static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2553{
2554 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2555 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2556
2557 if (v == SEQ_START_TOKEN) {
e905a9ed 2558 seq_printf(seq,
1da177e4
LT		 2559 "%3s %6s "
2560 "%10s %10s %6s %6s\n", "Idx",
2561 "Device", "MCA",
2562 "SRC", "INC", "EXC");
2563 } else {
2564 seq_printf(seq,
2565 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2566 "0x%08x %6lu %6lu\n",
2567 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2568 ntohl(state->im->multiaddr),
2569 ntohl(psf->sf_inaddr),
2570 psf->sf_count[MCAST_INCLUDE],
2571 psf->sf_count[MCAST_EXCLUDE]);
2572 }
2573 return 0;
2574}
2575
f690808e 2576static const struct seq_operations igmp_mcf_seq_ops = {
1da177e4
LT		 2577 .start = igmp_mcf_seq_start,
2578 .next = igmp_mcf_seq_next,
2579 .stop = igmp_mcf_seq_stop,
2580 .show = igmp_mcf_seq_show,
2581};
2582
2583static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2584{
2585 struct seq_file *seq;
2586 int rc = -ENOMEM;
0da974f4 2587 struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2588
2589 if (!s)
2590 goto out;
2591 rc = seq_open(file, &igmp_mcf_seq_ops);
2592 if (rc)
2593 goto out_kfree;
2594
2595 seq = file->private_data;
2596 seq->private = s;
1da177e4
LT		 2597out:
2598 return rc;
2599out_kfree:
2600 kfree(s);
2601 goto out;
2602}
2603
9a32144e 2604static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2605 .owner = THIS_MODULE,
2606 .open = igmp_mcf_seq_open,
2607 .read = seq_read,
2608 .llseek = seq_lseek,
2609 .release = seq_release_private,
2610};
2611
2612int __init igmp_mc_proc_init(void)
2613{
2614 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2615 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2616 return 0;
2617}
2618#endif
2619
2620EXPORT_SYMBOL(ip_mc_dec_group);
2621EXPORT_SYMBOL(ip_mc_inc_group);
2622EXPORT_SYMBOL(ip_mc_join_group);
a816c7c7 2623EXPORT_SYMBOL(ip_mc_rejoin_group);
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