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[net-next-2.6.git] / net / ipv4 / igmp.c
CommitLineData
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
b0e380b1 336 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
d10ba34b 337 skb_put(skb, sizeof(*pig));
d9edf9e2 338 pig = igmpv3_report_hdr(skb);
1da177e4
LT		 339 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
340 pig->resv1 = 0;
341 pig->csum = 0;
342 pig->resv2 = 0;
343 pig->ngrec = 0;
344 return skb;
345}
346
347static int igmpv3_sendpack(struct sk_buff *skb)
348{
eddc9ec5 349 struct iphdr *pip = ip_hdr(skb);
d9edf9e2 350 struct igmphdr *pig = igmp_hdr(skb);
27a884dc
ACM		 351 const int iplen = skb->tail - skb->network_header;
352 const int igmplen = skb->tail - skb->transport_header;
1da177e4 353
1da177e4
LT		 354 pip->tot_len = htons(iplen);
355 ip_send_check(pip);
d9edf9e2 356 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
1da177e4
LT		 357
358 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
359 dst_output);
360}
361
362static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
363{
364 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
365}
366
367static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
368 int type, struct igmpv3_grec **ppgr)
369{
370 struct net_device *dev = pmc->interface->dev;
371 struct igmpv3_report *pih;
372 struct igmpv3_grec *pgr;
373
374 if (!skb)
375 skb = igmpv3_newpack(dev, dev->mtu);
376 if (!skb)
377 return NULL;
378 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
379 pgr->grec_type = type;
380 pgr->grec_auxwords = 0;
381 pgr->grec_nsrcs = 0;
382 pgr->grec_mca = pmc->multiaddr;
d9edf9e2 383 pih = igmpv3_report_hdr(skb);
1da177e4
LT		 384 pih->ngrec = htons(ntohs(pih->ngrec)+1);
385 *ppgr = pgr;
386 return skb;
387}
388
389#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
390 skb_tailroom(skb)) : 0)
391
392static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
393 int type, int gdeleted, int sdeleted)
394{
395 struct net_device *dev = pmc->interface->dev;
396 struct igmpv3_report *pih;
397 struct igmpv3_grec *pgr = NULL;
398 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
ad12583f 399 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 400
401 if (pmc->multiaddr == IGMP_ALL_HOSTS)
402 return skb;
403
404 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
405 type == IGMPV3_MODE_IS_EXCLUDE;
406 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
407 type == IGMPV3_CHANGE_TO_EXCLUDE;
408
ad12583f
DS		 409 stotal = scount = 0;
410
1da177e4
LT		 411 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
412
ad12583f
DS		 413 if (!*psf_list)
414 goto empty_source;
415
d9edf9e2 416 pih = skb ? igmpv3_report_hdr(skb) : NULL;
1da177e4
LT		 417
418 /* EX and TO_EX get a fresh packet, if needed */
419 if (truncate) {
420 if (pih && pih->ngrec &&
421 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
422 if (skb)
423 igmpv3_sendpack(skb);
424 skb = igmpv3_newpack(dev, dev->mtu);
425 }
426 }
427 first = 1;
1da177e4
LT		 428 psf_prev = NULL;
429 for (psf=*psf_list; psf; psf=psf_next) {
ea4d9e72 430 __be32 *psrc;
1da177e4
LT		 431
432 psf_next = psf->sf_next;
433
434 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
435 psf_prev = psf;
436 continue;
437 }
438
439 /* clear marks on query responses */
440 if (isquery)
441 psf->sf_gsresp = 0;
442
63007727 443 if (AVAILABLE(skb) < sizeof(__be32) +
1da177e4
LT		 444 first*sizeof(struct igmpv3_grec)) {
445 if (truncate && !first)
446 break; /* truncate these */
447 if (pgr)
448 pgr->grec_nsrcs = htons(scount);
449 if (skb)
450 igmpv3_sendpack(skb);
451 skb = igmpv3_newpack(dev, dev->mtu);
452 first = 1;
453 scount = 0;
454 }
455 if (first) {
456 skb = add_grhead(skb, pmc, type, &pgr);
457 first = 0;
458 }
cc63f70b
AD		 459 if (!skb)
460 return NULL;
63007727 461 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
1da177e4 462 *psrc = psf->sf_inaddr;
ad12583f 463 scount++; stotal++;
1da177e4
LT		 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 }
ad12583f
DS		 478
479empty_source:
480 if (!stotal) {
481 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
482 type == IGMPV3_BLOCK_OLD_SOURCES)
483 return skb;
484 if (pmc->crcount || isquery) {
485 /* make sure we have room for group header */
486 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
487 igmpv3_sendpack(skb);
488 skb = NULL; /* add_grhead will get a new one */
489 }
490 skb = add_grhead(skb, pmc, type, &pgr);
491 }
492 }
1da177e4
LT		 493 if (pgr)
494 pgr->grec_nsrcs = htons(scount);
495
496 if (isquery)
497 pmc->gsquery = 0; /* clear query state on report */
498 return skb;
499}
500
501static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
502{
503 struct sk_buff *skb = NULL;
504 int type;
505
506 if (!pmc) {
507 read_lock(&in_dev->mc_list_lock);
508 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
509 if (pmc->multiaddr == IGMP_ALL_HOSTS)
510 continue;
511 spin_lock_bh(&pmc->lock);
512 if (pmc->sfcount[MCAST_EXCLUDE])
513 type = IGMPV3_MODE_IS_EXCLUDE;
514 else
515 type = IGMPV3_MODE_IS_INCLUDE;
516 skb = add_grec(skb, pmc, type, 0, 0);
517 spin_unlock_bh(&pmc->lock);
518 }
519 read_unlock(&in_dev->mc_list_lock);
520 } else {
521 spin_lock_bh(&pmc->lock);
522 if (pmc->sfcount[MCAST_EXCLUDE])
523 type = IGMPV3_MODE_IS_EXCLUDE;
524 else
525 type = IGMPV3_MODE_IS_INCLUDE;
526 skb = add_grec(skb, pmc, type, 0, 0);
527 spin_unlock_bh(&pmc->lock);
528 }
529 if (!skb)
530 return 0;
531 return igmpv3_sendpack(skb);
532}
533
534/*
535 * remove zero-count source records from a source filter list
536 */
537static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
538{
539 struct ip_sf_list *psf_prev, *psf_next, *psf;
540
541 psf_prev = NULL;
542 for (psf=*ppsf; psf; psf = psf_next) {
543 psf_next = psf->sf_next;
544 if (psf->sf_crcount == 0) {
545 if (psf_prev)
546 psf_prev->sf_next = psf->sf_next;
547 else
548 *ppsf = psf->sf_next;
549 kfree(psf);
550 } else
551 psf_prev = psf;
552 }
553}
554
555static void igmpv3_send_cr(struct in_device *in_dev)
556{
557 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
558 struct sk_buff *skb = NULL;
559 int type, dtype;
560
561 read_lock(&in_dev->mc_list_lock);
562 spin_lock_bh(&in_dev->mc_tomb_lock);
563
564 /* deleted MCA's */
565 pmc_prev = NULL;
566 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
567 pmc_next = pmc->next;
568 if (pmc->sfmode == MCAST_INCLUDE) {
569 type = IGMPV3_BLOCK_OLD_SOURCES;
570 dtype = IGMPV3_BLOCK_OLD_SOURCES;
571 skb = add_grec(skb, pmc, type, 1, 0);
572 skb = add_grec(skb, pmc, dtype, 1, 1);
573 }
574 if (pmc->crcount) {
1da177e4
LT		 575 if (pmc->sfmode == MCAST_EXCLUDE) {
576 type = IGMPV3_CHANGE_TO_INCLUDE;
577 skb = add_grec(skb, pmc, type, 1, 0);
578 }
ad12583f 579 pmc->crcount--;
1da177e4
LT		 580 if (pmc->crcount == 0) {
581 igmpv3_clear_zeros(&pmc->tomb);
582 igmpv3_clear_zeros(&pmc->sources);
583 }
584 }
585 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
586 if (pmc_prev)
587 pmc_prev->next = pmc_next;
588 else
589 in_dev->mc_tomb = pmc_next;
590 in_dev_put(pmc->interface);
591 kfree(pmc);
592 } else
593 pmc_prev = pmc;
594 }
595 spin_unlock_bh(&in_dev->mc_tomb_lock);
596
597 /* change recs */
598 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
599 spin_lock_bh(&pmc->lock);
600 if (pmc->sfcount[MCAST_EXCLUDE]) {
601 type = IGMPV3_BLOCK_OLD_SOURCES;
602 dtype = IGMPV3_ALLOW_NEW_SOURCES;
603 } else {
604 type = IGMPV3_ALLOW_NEW_SOURCES;
605 dtype = IGMPV3_BLOCK_OLD_SOURCES;
606 }
607 skb = add_grec(skb, pmc, type, 0, 0);
608 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
609
610 /* filter mode changes */
611 if (pmc->crcount) {
1da177e4
LT		 612 if (pmc->sfmode == MCAST_EXCLUDE)
613 type = IGMPV3_CHANGE_TO_EXCLUDE;
614 else
615 type = IGMPV3_CHANGE_TO_INCLUDE;
616 skb = add_grec(skb, pmc, type, 0, 0);
ad12583f 617 pmc->crcount--;
1da177e4
LT		 618 }
619 spin_unlock_bh(&pmc->lock);
620 }
621 read_unlock(&in_dev->mc_list_lock);
622
623 if (!skb)
624 return;
625 (void) igmpv3_sendpack(skb);
626}
627
628static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
629 int type)
630{
631 struct sk_buff *skb;
632 struct iphdr *iph;
633 struct igmphdr *ih;
634 struct rtable *rt;
635 struct net_device *dev = in_dev->dev;
63007727
AV		 636 __be32 group = pmc ? pmc->multiaddr : 0;
637 __be32 dst;
1da177e4
LT		 638
639 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
640 return igmpv3_send_report(in_dev, pmc);
641 else if (type == IGMP_HOST_LEAVE_MESSAGE)
642 dst = IGMP_ALL_ROUTER;
643 else
644 dst = group;
645
646 {
647 struct flowi fl = { .oif = dev->ifindex,
648 .nl_u = { .ip4_u = { .daddr = dst } },
649 .proto = IPPROTO_IGMP };
650 if (ip_route_output_key(&rt, &fl))
651 return -1;
652 }
653 if (rt->rt_src == 0) {
654 ip_rt_put(rt);
655 return -1;
656 }
657
658 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
659 if (skb == NULL) {
660 ip_rt_put(rt);
661 return -1;
662 }
663
664 skb->dst = &rt->u.dst;
665
666 skb_reserve(skb, LL_RESERVED_SPACE(dev));
667
7e28ecc2 668 skb_reset_network_header(skb);
eddc9ec5 669 iph = ip_hdr(skb);
7e28ecc2 670 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 671
672 iph->version = 4;
673 iph->ihl = (sizeof(struct iphdr)+4)>>2;
674 iph->tos = 0xc0;
675 iph->frag_off = htons(IP_DF);
676 iph->ttl = 1;
677 iph->daddr = dst;
678 iph->saddr = rt->rt_src;
679 iph->protocol = IPPROTO_IGMP;
680 iph->tot_len = htons(IGMP_SIZE);
681 ip_select_ident(iph, &rt->u.dst, NULL);
682 ((u8*)&iph[1])[0] = IPOPT_RA;
683 ((u8*)&iph[1])[1] = 4;
684 ((u8*)&iph[1])[2] = 0;
685 ((u8*)&iph[1])[3] = 0;
686 ip_send_check(iph);
687
688 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
689 ih->type=type;
690 ih->code=0;
691 ih->csum=0;
692 ih->group=group;
693 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
694
695 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
696 dst_output);
697}
698
699static void igmp_gq_timer_expire(unsigned long data)
700{
701 struct in_device *in_dev = (struct in_device *)data;
702
703 in_dev->mr_gq_running = 0;
704 igmpv3_send_report(in_dev, NULL);
705 __in_dev_put(in_dev);
706}
707
708static void igmp_ifc_timer_expire(unsigned long data)
709{
710 struct in_device *in_dev = (struct in_device *)data;
711
712 igmpv3_send_cr(in_dev);
713 if (in_dev->mr_ifc_count) {
714 in_dev->mr_ifc_count--;
715 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
716 }
717 __in_dev_put(in_dev);
718}
719
720static void igmp_ifc_event(struct in_device *in_dev)
721{
722 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
723 return;
e905a9ed 724 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 725 IGMP_Unsolicited_Report_Count;
726 igmp_ifc_start_timer(in_dev, 1);
727}
728
729
730static void igmp_timer_expire(unsigned long data)
731{
732 struct ip_mc_list *im=(struct ip_mc_list *)data;
733 struct in_device *in_dev = im->interface;
734
735 spin_lock(&im->lock);
736 im->tm_running=0;
737
738 if (im->unsolicit_count) {
739 im->unsolicit_count--;
740 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
741 }
742 im->reporter = 1;
743 spin_unlock(&im->lock);
744
745 if (IGMP_V1_SEEN(in_dev))
746 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
747 else if (IGMP_V2_SEEN(in_dev))
748 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
749 else
750 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
751
752 ip_ma_put(im);
753}
754
ad12583f 755/* mark EXCLUDE-mode sources */
ea4d9e72 756static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 757{
758 struct ip_sf_list *psf;
759 int i, scount;
760
ad12583f
DS		 761 scount = 0;
762 for (psf=pmc->sources; psf; psf=psf->sf_next) {
763 if (scount == nsrcs)
764 break;
765 for (i=0; i<nsrcs; i++) {
766 /* skip inactive filters */
767 if (pmc->sfcount[MCAST_INCLUDE] ||
768 pmc->sfcount[MCAST_EXCLUDE] !=
769 psf->sf_count[MCAST_EXCLUDE])
770 continue;
771 if (srcs[i] == psf->sf_inaddr) {
772 scount++;
773 break;
774 }
775 }
776 }
777 pmc->gsquery = 0;
778 if (scount == nsrcs) /* all sources excluded */
779 return 0;
780 return 1;
781}
782
ea4d9e72 783static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 784{
785 struct ip_sf_list *psf;
786 int i, scount;
787
788 if (pmc->sfmode == MCAST_EXCLUDE)
789 return igmp_xmarksources(pmc, nsrcs, srcs);
790
791 /* mark INCLUDE-mode sources */
1da177e4
LT		 792 scount = 0;
793 for (psf=pmc->sources; psf; psf=psf->sf_next) {
794 if (scount == nsrcs)
795 break;
796 for (i=0; i<nsrcs; i++)
797 if (srcs[i] == psf->sf_inaddr) {
798 psf->sf_gsresp = 1;
799 scount++;
800 break;
801 }
802 }
ad12583f
DS		 803 if (!scount) {
804 pmc->gsquery = 0;
805 return 0;
806 }
807 pmc->gsquery = 1;
808 return 1;
1da177e4
LT		 809}
810
63007727 811static void igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 812{
813 struct ip_mc_list *im;
814
815 /* Timers are only set for non-local groups */
816
817 if (group == IGMP_ALL_HOSTS)
818 return;
819
820 read_lock(&in_dev->mc_list_lock);
821 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
822 if (im->multiaddr == group) {
823 igmp_stop_timer(im);
824 break;
825 }
826 }
827 read_unlock(&in_dev->mc_list_lock);
828}
829
830static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
831 int len)
832{
d9edf9e2
ACM		 833 struct igmphdr *ih = igmp_hdr(skb);
834 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
1da177e4 835 struct ip_mc_list *im;
63007727 836 __be32 group = ih->group;
1da177e4
LT		 837 int max_delay;
838 int mark = 0;
839
840
841 if (len == 8) {
842 if (ih->code == 0) {
843 /* Alas, old v1 router presents here. */
e905a9ed 844
1da177e4
LT		 845 max_delay = IGMP_Query_Response_Interval;
846 in_dev->mr_v1_seen = jiffies +
847 IGMP_V1_Router_Present_Timeout;
848 group = 0;
849 } else {
850 /* v2 router present */
851 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
852 in_dev->mr_v2_seen = jiffies +
853 IGMP_V2_Router_Present_Timeout;
854 }
855 /* cancel the interface change timer */
856 in_dev->mr_ifc_count = 0;
857 if (del_timer(&in_dev->mr_ifc_timer))
858 __in_dev_put(in_dev);
859 /* clear deleted report items */
860 igmpv3_clear_delrec(in_dev);
861 } else if (len < 12) {
862 return; /* ignore bogus packet; freed by caller */
863 } else { /* v3 */
864 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
865 return;
e905a9ed 866
d9edf9e2 867 ih3 = igmpv3_query_hdr(skb);
1da177e4 868 if (ih3->nsrcs) {
e905a9ed 869 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 870 + ntohs(ih3->nsrcs)*sizeof(__be32)))
1da177e4 871 return;
d9edf9e2 872 ih3 = igmpv3_query_hdr(skb);
1da177e4
LT		 873 }
874
875 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
876 if (!max_delay)
877 max_delay = 1; /* can't mod w/ 0 */
878 in_dev->mr_maxdelay = max_delay;
879 if (ih3->qrv)
880 in_dev->mr_qrv = ih3->qrv;
881 if (!group) { /* general query */
882 if (ih3->nsrcs)
883 return; /* no sources allowed */
884 igmp_gq_start_timer(in_dev);
885 return;
886 }
887 /* mark sources to include, if group & source-specific */
888 mark = ih3->nsrcs != 0;
889 }
890
891 /*
892 * - Start the timers in all of our membership records
893 * that the query applies to for the interface on
894 * which the query arrived excl. those that belong
895 * to a "local" group (224.0.0.X)
896 * - For timers already running check if they need to
897 * be reset.
898 * - Use the igmp->igmp_code field as the maximum
899 * delay possible
900 */
901 read_lock(&in_dev->mc_list_lock);
902 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
ad12583f
DS		 903 int changed;
904
1da177e4
LT		 905 if (group && group != im->multiaddr)
906 continue;
907 if (im->multiaddr == IGMP_ALL_HOSTS)
908 continue;
909 spin_lock_bh(&im->lock);
910 if (im->tm_running)
911 im->gsquery = im->gsquery && mark;
912 else
913 im->gsquery = mark;
ad12583f 914 changed = !im->gsquery ||
e905a9ed 915 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 916 spin_unlock_bh(&im->lock);
ad12583f
DS		 917 if (changed)
918 igmp_mod_timer(im, max_delay);
1da177e4
LT		 919 }
920 read_unlock(&in_dev->mc_list_lock);
921}
922
923int igmp_rcv(struct sk_buff *skb)
924{
925 /* This basically follows the spec line by line -- see RFC1112 */
926 struct igmphdr *ih;
927 struct in_device *in_dev = in_dev_get(skb->dev);
928 int len = skb->len;
929
930 if (in_dev==NULL) {
931 kfree_skb(skb);
932 return 0;
933 }
934
fb286bb2
HX		 935 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
936 goto drop;
937
938 switch (skb->ip_summed) {
84fa7933 939 case CHECKSUM_COMPLETE:
d3bc23e7 940 if (!csum_fold(skb->csum))
fb286bb2
HX		 941 break;
942 /* fall through */
943 case CHECKSUM_NONE:
944 skb->csum = 0;
945 if (__skb_checksum_complete(skb))
946 goto drop;
1da177e4
LT		 947 }
948
d9edf9e2 949 ih = igmp_hdr(skb);
1da177e4
LT		 950 switch (ih->type) {
951 case IGMP_HOST_MEMBERSHIP_QUERY:
952 igmp_heard_query(in_dev, skb, len);
953 break;
954 case IGMP_HOST_MEMBERSHIP_REPORT:
955 case IGMPV2_HOST_MEMBERSHIP_REPORT:
956 case IGMPV3_HOST_MEMBERSHIP_REPORT:
957 /* Is it our report looped back? */
958 if (((struct rtable*)skb->dst)->fl.iif == 0)
959 break;
24c69275
DS		 960 /* don't rely on MC router hearing unicast reports */
961 if (skb->pkt_type == PACKET_MULTICAST ||
962 skb->pkt_type == PACKET_BROADCAST)
963 igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 964 break;
965 case IGMP_PIM:
966#ifdef CONFIG_IP_PIMSM_V1
967 in_dev_put(in_dev);
968 return pim_rcv_v1(skb);
969#endif
970 case IGMP_DVMRP:
971 case IGMP_TRACE:
972 case IGMP_HOST_LEAVE_MESSAGE:
973 case IGMP_MTRACE:
974 case IGMP_MTRACE_RESP:
975 break;
976 default:
dd1c1853 977 break;
1da177e4 978 }
fb286bb2
HX		 979
980drop:
1da177e4
LT		 981 in_dev_put(in_dev);
982 kfree_skb(skb);
983 return 0;
984}
985
986#endif
987
988
989/*
990 * Add a filter to a device
991 */
992
63007727 993static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 994{
995 char buf[MAX_ADDR_LEN];
996 struct net_device *dev = in_dev->dev;
997
998 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
999 We will get multicast token leakage, when IFF_MULTICAST
1000 is changed. This check should be done in dev->set_multicast_list
1001 routine. Something sort of:
1002 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1003 --ANK
1004 */
1005 if (arp_mc_map(addr, buf, dev, 0) == 0)
1006 dev_mc_add(dev,buf,dev->addr_len,0);
1007}
1008
1009/*
1010 * Remove a filter from a device
1011 */
1012
63007727 1013static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1014{
1015 char buf[MAX_ADDR_LEN];
1016 struct net_device *dev = in_dev->dev;
1017
1018 if (arp_mc_map(addr, buf, dev, 0) == 0)
1019 dev_mc_delete(dev,buf,dev->addr_len,0);
1020}
1021
1022#ifdef CONFIG_IP_MULTICAST
1023/*
1024 * deleted ip_mc_list manipulation
1025 */
1026static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1027{
1028 struct ip_mc_list *pmc;
1029
1030 /* this is an "ip_mc_list" for convenience; only the fields below
1031 * are actually used. In particular, the refcnt and users are not
1032 * used for management of the delete list. Using the same structure
1033 * for deleted items allows change reports to use common code with
1034 * non-deleted or query-response MCA's.
1035 */
0da974f4 1036 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1037 if (!pmc)
1038 return;
1da177e4
LT		 1039 spin_lock_bh(&im->lock);
1040 pmc->interface = im->interface;
1041 in_dev_hold(in_dev);
1042 pmc->multiaddr = im->multiaddr;
1043 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1044 IGMP_Unsolicited_Report_Count;
1045 pmc->sfmode = im->sfmode;
1046 if (pmc->sfmode == MCAST_INCLUDE) {
1047 struct ip_sf_list *psf;
1048
1049 pmc->tomb = im->tomb;
1050 pmc->sources = im->sources;
1051 im->tomb = im->sources = NULL;
1052 for (psf=pmc->sources; psf; psf=psf->sf_next)
1053 psf->sf_crcount = pmc->crcount;
1054 }
1055 spin_unlock_bh(&im->lock);
1056
1057 spin_lock_bh(&in_dev->mc_tomb_lock);
1058 pmc->next = in_dev->mc_tomb;
1059 in_dev->mc_tomb = pmc;
1060 spin_unlock_bh(&in_dev->mc_tomb_lock);
1061}
1062
63007727 1063static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1064{
1065 struct ip_mc_list *pmc, *pmc_prev;
1066 struct ip_sf_list *psf, *psf_next;
1067
1068 spin_lock_bh(&in_dev->mc_tomb_lock);
1069 pmc_prev = NULL;
1070 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1071 if (pmc->multiaddr == multiaddr)
1072 break;
1073 pmc_prev = pmc;
1074 }
1075 if (pmc) {
1076 if (pmc_prev)
1077 pmc_prev->next = pmc->next;
1078 else
1079 in_dev->mc_tomb = pmc->next;
1080 }
1081 spin_unlock_bh(&in_dev->mc_tomb_lock);
1082 if (pmc) {
1083 for (psf=pmc->tomb; psf; psf=psf_next) {
1084 psf_next = psf->sf_next;
1085 kfree(psf);
1086 }
1087 in_dev_put(pmc->interface);
1088 kfree(pmc);
1089 }
1090}
1091
1092static void igmpv3_clear_delrec(struct in_device *in_dev)
1093{
1094 struct ip_mc_list *pmc, *nextpmc;
1095
1096 spin_lock_bh(&in_dev->mc_tomb_lock);
1097 pmc = in_dev->mc_tomb;
1098 in_dev->mc_tomb = NULL;
1099 spin_unlock_bh(&in_dev->mc_tomb_lock);
1100
1101 for (; pmc; pmc = nextpmc) {
1102 nextpmc = pmc->next;
1103 ip_mc_clear_src(pmc);
1104 in_dev_put(pmc->interface);
1105 kfree(pmc);
1106 }
1107 /* clear dead sources, too */
1108 read_lock(&in_dev->mc_list_lock);
1109 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1110 struct ip_sf_list *psf, *psf_next;
1111
1112 spin_lock_bh(&pmc->lock);
1113 psf = pmc->tomb;
1114 pmc->tomb = NULL;
1115 spin_unlock_bh(&pmc->lock);
1116 for (; psf; psf=psf_next) {
1117 psf_next = psf->sf_next;
1118 kfree(psf);
1119 }
1120 }
1121 read_unlock(&in_dev->mc_list_lock);
1122}
1123#endif
1124
1125static void igmp_group_dropped(struct ip_mc_list *im)
1126{
1127 struct in_device *in_dev = im->interface;
1128#ifdef CONFIG_IP_MULTICAST
1129 int reporter;
1130#endif
1131
1132 if (im->loaded) {
1133 im->loaded = 0;
1134 ip_mc_filter_del(in_dev, im->multiaddr);
1135 }
1136
1137#ifdef CONFIG_IP_MULTICAST
1138 if (im->multiaddr == IGMP_ALL_HOSTS)
1139 return;
1140
1141 reporter = im->reporter;
1142 igmp_stop_timer(im);
1143
1144 if (!in_dev->dead) {
1145 if (IGMP_V1_SEEN(in_dev))
1146 goto done;
1147 if (IGMP_V2_SEEN(in_dev)) {
1148 if (reporter)
1149 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1150 goto done;
1151 }
1152 /* IGMPv3 */
1153 igmpv3_add_delrec(in_dev, im);
1154
1155 igmp_ifc_event(in_dev);
1156 }
1157done:
1158#endif
1159 ip_mc_clear_src(im);
1160}
1161
1162static void igmp_group_added(struct ip_mc_list *im)
1163{
1164 struct in_device *in_dev = im->interface;
1165
1166 if (im->loaded == 0) {
1167 im->loaded = 1;
1168 ip_mc_filter_add(in_dev, im->multiaddr);
1169 }
1170
1171#ifdef CONFIG_IP_MULTICAST
1172 if (im->multiaddr == IGMP_ALL_HOSTS)
1173 return;
1174
1175 if (in_dev->dead)
1176 return;
1177 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1178 spin_lock_bh(&im->lock);
1179 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1180 spin_unlock_bh(&im->lock);
1181 return;
1182 }
1183 /* else, v3 */
1184
1185 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1186 IGMP_Unsolicited_Report_Count;
1187 igmp_ifc_event(in_dev);
1188#endif
1189}
1190
1191
1192/*
1193 * Multicast list managers
1194 */
1195
1196
1197/*
1198 * A socket has joined a multicast group on device dev.
1199 */
1200
8f935bbd 1201void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1202{
1203 struct ip_mc_list *im;
1204
1205 ASSERT_RTNL();
1206
1207 for (im=in_dev->mc_list; im; im=im->next) {
1208 if (im->multiaddr == addr) {
1209 im->users++;
1210 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1211 goto out;
1212 }
1213 }
1214
8b3a7005 1215 im = kmalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1216 if (!im)
1217 goto out;
1218
1219 im->users=1;
1220 im->interface=in_dev;
1221 in_dev_hold(in_dev);
1222 im->multiaddr=addr;
1223 /* initial mode is (EX, empty) */
1224 im->sfmode = MCAST_EXCLUDE;
1225 im->sfcount[MCAST_INCLUDE] = 0;
1226 im->sfcount[MCAST_EXCLUDE] = 1;
1227 im->sources = NULL;
1228 im->tomb = NULL;
1229 im->crcount = 0;
1230 atomic_set(&im->refcnt, 1);
1231 spin_lock_init(&im->lock);
1232#ifdef CONFIG_IP_MULTICAST
1233 im->tm_running=0;
1234 init_timer(&im->timer);
1235 im->timer.data=(unsigned long)im;
1236 im->timer.function=&igmp_timer_expire;
1237 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1238 im->reporter = 0;
1239 im->gsquery = 0;
1240#endif
1241 im->loaded = 0;
1242 write_lock_bh(&in_dev->mc_list_lock);
1243 im->next=in_dev->mc_list;
1244 in_dev->mc_list=im;
1245 write_unlock_bh(&in_dev->mc_list_lock);
1246#ifdef CONFIG_IP_MULTICAST
1247 igmpv3_del_delrec(in_dev, im->multiaddr);
1248#endif
1249 igmp_group_added(im);
1250 if (!in_dev->dead)
1251 ip_rt_multicast_event(in_dev);
1252out:
1253 return;
1254}
1255
a816c7c7
JV		 1256/*
1257 * Resend IGMP JOIN report; used for bonding.
1258 */
1259void ip_mc_rejoin_group(struct ip_mc_list *im)
1260{
08882669 1261#ifdef CONFIG_IP_MULTICAST
a816c7c7
JV		 1262 struct in_device *in_dev = im->interface;
1263
a816c7c7
JV		 1264 if (im->multiaddr == IGMP_ALL_HOSTS)
1265 return;
1266
1267 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1268 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1269 return;
1270 }
1271 /* else, v3 */
1272 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1273 IGMP_Unsolicited_Report_Count;
1274 igmp_ifc_event(in_dev);
1275#endif
1276}
1277
1da177e4
LT		 1278/*
1279 * A socket has left a multicast group on device dev
1280 */
1281
8f935bbd 1282void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1283{
1284 struct ip_mc_list *i, **ip;
e905a9ed 1285
1da177e4 1286 ASSERT_RTNL();
e905a9ed 1287
1da177e4
LT		 1288 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1289 if (i->multiaddr==addr) {
1290 if (--i->users == 0) {
1291 write_lock_bh(&in_dev->mc_list_lock);
1292 *ip = i->next;
1293 write_unlock_bh(&in_dev->mc_list_lock);
1294 igmp_group_dropped(i);
1295
1296 if (!in_dev->dead)
1297 ip_rt_multicast_event(in_dev);
1298
1299 ip_ma_put(i);
1300 return;
1301 }
1302 break;
1303 }
1304 }
1305}
1306
1307/* Device going down */
1308
1309void ip_mc_down(struct in_device *in_dev)
1310{
1311 struct ip_mc_list *i;
1312
1313 ASSERT_RTNL();
1314
1315 for (i=in_dev->mc_list; i; i=i->next)
1316 igmp_group_dropped(i);
1317
1318#ifdef CONFIG_IP_MULTICAST
1319 in_dev->mr_ifc_count = 0;
1320 if (del_timer(&in_dev->mr_ifc_timer))
1321 __in_dev_put(in_dev);
1322 in_dev->mr_gq_running = 0;
1323 if (del_timer(&in_dev->mr_gq_timer))
1324 __in_dev_put(in_dev);
1325 igmpv3_clear_delrec(in_dev);
1326#endif
1327
1328 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1329}
1330
1331void ip_mc_init_dev(struct in_device *in_dev)
1332{
1333 ASSERT_RTNL();
1334
1335 in_dev->mc_tomb = NULL;
1336#ifdef CONFIG_IP_MULTICAST
1337 in_dev->mr_gq_running = 0;
1338 init_timer(&in_dev->mr_gq_timer);
1339 in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1340 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1341 in_dev->mr_ifc_count = 0;
1342 init_timer(&in_dev->mr_ifc_timer);
1343 in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1344 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1345 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1346#endif
1347
1348 rwlock_init(&in_dev->mc_list_lock);
1349 spin_lock_init(&in_dev->mc_tomb_lock);
1350}
1351
1352/* Device going up */
1353
1354void ip_mc_up(struct in_device *in_dev)
1355{
1356 struct ip_mc_list *i;
1357
1358 ASSERT_RTNL();
1359
1360 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1361
1362 for (i=in_dev->mc_list; i; i=i->next)
1363 igmp_group_added(i);
1364}
1365
1366/*
1367 * Device is about to be destroyed: clean up.
1368 */
1369
1370void ip_mc_destroy_dev(struct in_device *in_dev)
1371{
1372 struct ip_mc_list *i;
1373
1374 ASSERT_RTNL();
1375
1376 /* Deactivate timers */
1377 ip_mc_down(in_dev);
1378
1379 write_lock_bh(&in_dev->mc_list_lock);
1380 while ((i = in_dev->mc_list) != NULL) {
1381 in_dev->mc_list = i->next;
1382 write_unlock_bh(&in_dev->mc_list_lock);
1383
1384 igmp_group_dropped(i);
1385 ip_ma_put(i);
1386
1387 write_lock_bh(&in_dev->mc_list_lock);
1388 }
1389 write_unlock_bh(&in_dev->mc_list_lock);
1390}
1391
1392static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1393{
1394 struct flowi fl = { .nl_u = { .ip4_u =
1395 { .daddr = imr->imr_multiaddr.s_addr } } };
1396 struct rtable *rt;
1397 struct net_device *dev = NULL;
1398 struct in_device *idev = NULL;
1399
1400 if (imr->imr_ifindex) {
1401 idev = inetdev_by_index(imr->imr_ifindex);
1402 if (idev)
1403 __in_dev_put(idev);
1404 return idev;
1405 }
1406 if (imr->imr_address.s_addr) {
1407 dev = ip_dev_find(imr->imr_address.s_addr);
1408 if (!dev)
1409 return NULL;
15333061 1410 dev_put(dev);
1da177e4
LT		 1411 }
1412
1413 if (!dev && !ip_route_output_key(&rt, &fl)) {
1414 dev = rt->u.dst.dev;
1415 ip_rt_put(rt);
1416 }
1417 if (dev) {
1418 imr->imr_ifindex = dev->ifindex;
e5ed6399 1419 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1420 }
1421 return idev;
1422}
1423
1424/*
1425 * Join a socket to a group
1426 */
ab32ea5d
BH		 1427int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1428int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1da177e4
LT		 1429
1430
1431static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1432 __be32 *psfsrc)
1da177e4
LT		 1433{
1434 struct ip_sf_list *psf, *psf_prev;
1435 int rv = 0;
1436
1437 psf_prev = NULL;
1438 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1439 if (psf->sf_inaddr == *psfsrc)
1440 break;
1441 psf_prev = psf;
1442 }
1443 if (!psf || psf->sf_count[sfmode] == 0) {
1444 /* source filter not found, or count wrong => bug */
1445 return -ESRCH;
1446 }
1447 psf->sf_count[sfmode]--;
1448 if (psf->sf_count[sfmode] == 0) {
1449 ip_rt_multicast_event(pmc->interface);
1450 }
1451 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1452#ifdef CONFIG_IP_MULTICAST
1453 struct in_device *in_dev = pmc->interface;
1454#endif
1455
1456 /* no more filters for this source */
1457 if (psf_prev)
1458 psf_prev->sf_next = psf->sf_next;
1459 else
1460 pmc->sources = psf->sf_next;
1461#ifdef CONFIG_IP_MULTICAST
1462 if (psf->sf_oldin &&
1463 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
e905a9ed 1464 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1465 IGMP_Unsolicited_Report_Count;
1466 psf->sf_next = pmc->tomb;
1467 pmc->tomb = psf;
1468 rv = 1;
1469 } else
1470#endif
1471 kfree(psf);
1472 }
1473 return rv;
1474}
1475
1476#ifndef CONFIG_IP_MULTICAST
1477#define igmp_ifc_event(x) do { } while (0)
1478#endif
1479
8f935bbd
AV		 1480static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1481 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1482{
1483 struct ip_mc_list *pmc;
1484 int changerec = 0;
1485 int i, err;
1486
1487 if (!in_dev)
1488 return -ENODEV;
1489 read_lock(&in_dev->mc_list_lock);
1490 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1491 if (*pmca == pmc->multiaddr)
1492 break;
1493 }
1494 if (!pmc) {
1495 /* MCA not found?? bug */
1496 read_unlock(&in_dev->mc_list_lock);
1497 return -ESRCH;
1498 }
1499 spin_lock_bh(&pmc->lock);
1500 read_unlock(&in_dev->mc_list_lock);
1501#ifdef CONFIG_IP_MULTICAST
1502 sf_markstate(pmc);
1503#endif
1504 if (!delta) {
1505 err = -EINVAL;
1506 if (!pmc->sfcount[sfmode])
1507 goto out_unlock;
1508 pmc->sfcount[sfmode]--;
1509 }
1510 err = 0;
1511 for (i=0; i<sfcount; i++) {
1512 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1513
1514 changerec |= rv > 0;
1515 if (!err && rv < 0)
1516 err = rv;
1517 }
1518 if (pmc->sfmode == MCAST_EXCLUDE &&
1519 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1520 pmc->sfcount[MCAST_INCLUDE]) {
1521#ifdef CONFIG_IP_MULTICAST
1522 struct ip_sf_list *psf;
1523#endif
1524
1525 /* filter mode change */
1526 pmc->sfmode = MCAST_INCLUDE;
1527#ifdef CONFIG_IP_MULTICAST
e905a9ed 1528 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1529 IGMP_Unsolicited_Report_Count;
1530 in_dev->mr_ifc_count = pmc->crcount;
1531 for (psf=pmc->sources; psf; psf = psf->sf_next)
1532 psf->sf_crcount = 0;
1533 igmp_ifc_event(pmc->interface);
1534 } else if (sf_setstate(pmc) || changerec) {
1535 igmp_ifc_event(pmc->interface);
1536#endif
1537 }
1538out_unlock:
1539 spin_unlock_bh(&pmc->lock);
1540 return err;
1541}
1542
1543/*
1544 * Add multicast single-source filter to the interface list
1545 */
1546static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1547 __be32 *psfsrc, int delta)
1da177e4
LT		 1548{
1549 struct ip_sf_list *psf, *psf_prev;
1550
1551 psf_prev = NULL;
1552 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1553 if (psf->sf_inaddr == *psfsrc)
1554 break;
1555 psf_prev = psf;
1556 }
1557 if (!psf) {
0da974f4 1558 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1559 if (!psf)
1560 return -ENOBUFS;
1da177e4
LT		 1561 psf->sf_inaddr = *psfsrc;
1562 if (psf_prev) {
1563 psf_prev->sf_next = psf;
1564 } else
1565 pmc->sources = psf;
1566 }
1567 psf->sf_count[sfmode]++;
1568 if (psf->sf_count[sfmode] == 1) {
1569 ip_rt_multicast_event(pmc->interface);
1570 }
1571 return 0;
1572}
1573
1574#ifdef CONFIG_IP_MULTICAST
1575static void sf_markstate(struct ip_mc_list *pmc)
1576{
1577 struct ip_sf_list *psf;
1578 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1579
1580 for (psf=pmc->sources; psf; psf=psf->sf_next)
1581 if (pmc->sfcount[MCAST_EXCLUDE]) {
1582 psf->sf_oldin = mca_xcount ==
1583 psf->sf_count[MCAST_EXCLUDE] &&
1584 !psf->sf_count[MCAST_INCLUDE];
1585 } else
1586 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1587}
1588
1589static int sf_setstate(struct ip_mc_list *pmc)
1590{
ad12583f 1591 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1592 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1593 int qrv = pmc->interface->mr_qrv;
1594 int new_in, rv;
1595
1596 rv = 0;
1597 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1598 if (pmc->sfcount[MCAST_EXCLUDE]) {
1599 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1600 !psf->sf_count[MCAST_INCLUDE];
1601 } else
1602 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1603 if (new_in) {
1604 if (!psf->sf_oldin) {
76edc605 1605 struct ip_sf_list *prev = NULL;
ad12583f
DS		 1606
1607 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1608 if (dpsf->sf_inaddr == psf->sf_inaddr)
1609 break;
1610 prev = dpsf;
1611 }
1612 if (dpsf) {
1613 if (prev)
1614 prev->sf_next = dpsf->sf_next;
1615 else
1616 pmc->tomb = dpsf->sf_next;
1617 kfree(dpsf);
1618 }
1619 psf->sf_crcount = qrv;
1620 rv++;
1621 }
1622 } else if (psf->sf_oldin) {
1623
1624 psf->sf_crcount = 0;
1625 /*
1626 * add or update "delete" records if an active filter
1627 * is now inactive
1628 */
1629 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1630 if (dpsf->sf_inaddr == psf->sf_inaddr)
1631 break;
1632 if (!dpsf) {
1633 dpsf = (struct ip_sf_list *)
1634 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1635 if (!dpsf)
1636 continue;
1637 *dpsf = *psf;
1638 /* pmc->lock held by callers */
1639 dpsf->sf_next = pmc->tomb;
1640 pmc->tomb = dpsf;
1641 }
1642 dpsf->sf_crcount = qrv;
1da177e4
LT		 1643 rv++;
1644 }
1645 }
1646 return rv;
1647}
1648#endif
1649
1650/*
1651 * Add multicast source filter list to the interface list
1652 */
8f935bbd
AV		 1653static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1654 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1655{
1656 struct ip_mc_list *pmc;
1657 int isexclude;
1658 int i, err;
1659
1660 if (!in_dev)
1661 return -ENODEV;
1662 read_lock(&in_dev->mc_list_lock);
1663 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1664 if (*pmca == pmc->multiaddr)
1665 break;
1666 }
1667 if (!pmc) {
1668 /* MCA not found?? bug */
1669 read_unlock(&in_dev->mc_list_lock);
1670 return -ESRCH;
1671 }
1672 spin_lock_bh(&pmc->lock);
1673 read_unlock(&in_dev->mc_list_lock);
1674
1675#ifdef CONFIG_IP_MULTICAST
1676 sf_markstate(pmc);
1677#endif
1678 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1679 if (!delta)
1680 pmc->sfcount[sfmode]++;
1681 err = 0;
1682 for (i=0; i<sfcount; i++) {
1683 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1684 if (err)
1685 break;
1686 }
1687 if (err) {
1688 int j;
1689
1690 pmc->sfcount[sfmode]--;
1691 for (j=0; j<i; j++)
1692 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1693 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1694#ifdef CONFIG_IP_MULTICAST
1695 struct in_device *in_dev = pmc->interface;
1696 struct ip_sf_list *psf;
1697#endif
1698
1699 /* filter mode change */
1700 if (pmc->sfcount[MCAST_EXCLUDE])
1701 pmc->sfmode = MCAST_EXCLUDE;
1702 else if (pmc->sfcount[MCAST_INCLUDE])
1703 pmc->sfmode = MCAST_INCLUDE;
1704#ifdef CONFIG_IP_MULTICAST
1705 /* else no filters; keep old mode for reports */
1706
e905a9ed 1707 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1708 IGMP_Unsolicited_Report_Count;
1709 in_dev->mr_ifc_count = pmc->crcount;
1710 for (psf=pmc->sources; psf; psf = psf->sf_next)
1711 psf->sf_crcount = 0;
1712 igmp_ifc_event(in_dev);
1713 } else if (sf_setstate(pmc)) {
1714 igmp_ifc_event(in_dev);
1715#endif
1716 }
1717 spin_unlock_bh(&pmc->lock);
1718 return err;
1719}
1720
1721static void ip_mc_clear_src(struct ip_mc_list *pmc)
1722{
1723 struct ip_sf_list *psf, *nextpsf;
1724
1725 for (psf=pmc->tomb; psf; psf=nextpsf) {
1726 nextpsf = psf->sf_next;
1727 kfree(psf);
1728 }
1729 pmc->tomb = NULL;
1730 for (psf=pmc->sources; psf; psf=nextpsf) {
1731 nextpsf = psf->sf_next;
1732 kfree(psf);
1733 }
1734 pmc->sources = NULL;
1735 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1736 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1737 pmc->sfcount[MCAST_EXCLUDE] = 1;
1738}
1739
1740
1741/*
1742 * Join a multicast group
1743 */
1744int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1745{
1746 int err;
8f935bbd 1747 __be32 addr = imr->imr_multiaddr.s_addr;
ca9b907d 1748 struct ip_mc_socklist *iml=NULL, *i;
1da177e4
LT		 1749 struct in_device *in_dev;
1750 struct inet_sock *inet = inet_sk(sk);
ca9b907d 1751 int ifindex;
1da177e4
LT		 1752 int count = 0;
1753
1754 if (!MULTICAST(addr))
1755 return -EINVAL;
1756
6756ae4b 1757 rtnl_lock();
1da177e4
LT		 1758
1759 in_dev = ip_mc_find_dev(imr);
1760
1761 if (!in_dev) {
1762 iml = NULL;
1763 err = -ENODEV;
1764 goto done;
1765 }
1766
1da177e4 1767 err = -EADDRINUSE;
ca9b907d 1768 ifindex = imr->imr_ifindex;
1da177e4 1769 for (i = inet->mc_list; i; i = i->next) {
ca9b907d
DS		 1770 if (i->multi.imr_multiaddr.s_addr == addr &&
1771 i->multi.imr_ifindex == ifindex)
1da177e4 1772 goto done;
1da177e4
LT		 1773 count++;
1774 }
1775 err = -ENOBUFS;
ca9b907d
DS		 1776 if (count >= sysctl_igmp_max_memberships)
1777 goto done;
8b3a7005 1778 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
ca9b907d 1779 if (iml == NULL)
1da177e4 1780 goto done;
ca9b907d 1781
1da177e4
LT		 1782 memcpy(&iml->multi, imr, sizeof(*imr));
1783 iml->next = inet->mc_list;
1da177e4
LT		 1784 iml->sflist = NULL;
1785 iml->sfmode = MCAST_EXCLUDE;
1786 inet->mc_list = iml;
1787 ip_mc_inc_group(in_dev, addr);
1da177e4 1788 err = 0;
1da177e4 1789done:
6756ae4b 1790 rtnl_unlock();
1da177e4
LT		 1791 return err;
1792}
1793
1794static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1795 struct in_device *in_dev)
1796{
1797 int err;
1798
1799 if (iml->sflist == 0) {
1800 /* any-source empty exclude case */
1801 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1802 iml->sfmode, 0, NULL, 0);
1803 }
1804 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1805 iml->sfmode, iml->sflist->sl_count,
1806 iml->sflist->sl_addr, 0);
1807 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1808 iml->sflist = NULL;
1809 return err;
1810}
1811
1812/*
1813 * Ask a socket to leave a group.
1814 */
1815
1816int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1817{
1818 struct inet_sock *inet = inet_sk(sk);
1819 struct ip_mc_socklist *iml, **imlp;
84b42bae 1820 struct in_device *in_dev;
8f935bbd 1821 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1822 u32 ifindex;
acd6e00b 1823 int ret = -EADDRNOTAVAIL;
1da177e4
LT		 1824
1825 rtnl_lock();
84b42bae 1826 in_dev = ip_mc_find_dev(imr);
84b42bae 1827 ifindex = imr->imr_ifindex;
1da177e4 1828 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
acd6e00b
DS		 1829 if (iml->multi.imr_multiaddr.s_addr != group)
1830 continue;
1831 if (ifindex) {
1832 if (iml->multi.imr_ifindex != ifindex)
1833 continue;
1834 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1835 iml->multi.imr_address.s_addr)
1836 continue;
1da177e4 1837
acd6e00b 1838 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4 1839
acd6e00b
DS		 1840 *imlp = iml->next;
1841
1842 if (in_dev)
84b42bae 1843 ip_mc_dec_group(in_dev, group);
acd6e00b
DS		 1844 rtnl_unlock();
1845 sock_kfree_s(sk, iml, sizeof(*iml));
1846 return 0;
1da177e4 1847 }
acd6e00b
DS		 1848 if (!in_dev)
1849 ret = -ENODEV;
1da177e4 1850 rtnl_unlock();
acd6e00b 1851 return ret;
1da177e4
LT		 1852}
1853
1854int ip_mc_source(int add, int omode, struct sock *sk, struct
1855 ip_mreq_source *mreqs, int ifindex)
1856{
1857 int err;
1858 struct ip_mreqn imr;
63007727 1859 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 1860 struct ip_mc_socklist *pmc;
1861 struct in_device *in_dev = NULL;
1862 struct inet_sock *inet = inet_sk(sk);
1863 struct ip_sf_socklist *psl;
8cdaaa15 1864 int leavegroup = 0;
1da177e4
LT		 1865 int i, j, rv;
1866
1867 if (!MULTICAST(addr))
1868 return -EINVAL;
1869
6756ae4b 1870 rtnl_lock();
1da177e4
LT		 1871
1872 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1873 imr.imr_address.s_addr = mreqs->imr_interface;
1874 imr.imr_ifindex = ifindex;
1875 in_dev = ip_mc_find_dev(&imr);
1876
1877 if (!in_dev) {
1878 err = -ENODEV;
1879 goto done;
1880 }
1881 err = -EADDRNOTAVAIL;
1882
1883 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
ca9b907d
DS		 1884 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1885 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1da177e4
LT		 1886 break;
1887 }
917f2f10
DS		 1888 if (!pmc) { /* must have a prior join */
1889 err = -EINVAL;
1da177e4 1890 goto done;
917f2f10 1891 }
1da177e4
LT		 1892 /* if a source filter was set, must be the same mode as before */
1893 if (pmc->sflist) {
917f2f10
DS		 1894 if (pmc->sfmode != omode) {
1895 err = -EINVAL;
1da177e4 1896 goto done;
917f2f10 1897 }
1da177e4
LT		 1898 } else if (pmc->sfmode != omode) {
1899 /* allow mode switches for empty-set filters */
1900 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 1901 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 1902 NULL, 0);
1903 pmc->sfmode = omode;
1904 }
1905
1906 psl = pmc->sflist;
1907 if (!add) {
1908 if (!psl)
917f2f10 1909 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1910 rv = !0;
1911 for (i=0; i<psl->sl_count; i++) {
1912 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1913 sizeof(__be32));
1da177e4
LT		 1914 if (rv == 0)
1915 break;
1916 }
1917 if (rv) /* source not found */
917f2f10 1918 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1919
8cdaaa15
DS		 1920 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1921 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1922 leavegroup = 1;
1923 goto done;
1924 }
1925
1da177e4 1926 /* update the interface filter */
e905a9ed 1927 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1928 &mreqs->imr_sourceaddr, 1);
1929
1930 for (j=i+1; j<psl->sl_count; j++)
1931 psl->sl_addr[j-1] = psl->sl_addr[j];
1932 psl->sl_count--;
1933 err = 0;
1934 goto done;
1935 }
1936 /* else, add a new source to the filter */
1937
1938 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1939 err = -ENOBUFS;
1940 goto done;
1941 }
1942 if (!psl || psl->sl_count == psl->sl_max) {
1943 struct ip_sf_socklist *newpsl;
1944 int count = IP_SFBLOCK;
1945
1946 if (psl)
1947 count += psl->sl_max;
8b3a7005 1948 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 1949 if (!newpsl) {
1950 err = -ENOBUFS;
1951 goto done;
1952 }
1953 newpsl->sl_max = count;
1954 newpsl->sl_count = count - IP_SFBLOCK;
1955 if (psl) {
1956 for (i=0; i<psl->sl_count; i++)
1957 newpsl->sl_addr[i] = psl->sl_addr[i];
1958 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1959 }
1960 pmc->sflist = psl = newpsl;
1961 }
1962 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1963 for (i=0; i<psl->sl_count; i++) {
1964 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1965 sizeof(__be32));
1da177e4
LT		 1966 if (rv == 0)
1967 break;
1968 }
1969 if (rv == 0) /* address already there is an error */
1970 goto done;
1971 for (j=psl->sl_count-1; j>=i; j--)
1972 psl->sl_addr[j+1] = psl->sl_addr[j];
1973 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1974 psl->sl_count++;
1975 err = 0;
1976 /* update the interface list */
e905a9ed 1977 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1978 &mreqs->imr_sourceaddr, 1);
1979done:
6756ae4b 1980 rtnl_unlock();
8cdaaa15
DS		 1981 if (leavegroup)
1982 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 1983 return err;
1984}
1985
1986int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1987{
9951f036 1988 int err = 0;
1da177e4 1989 struct ip_mreqn imr;
63007727 1990 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 1991 struct ip_mc_socklist *pmc;
1992 struct in_device *in_dev;
1993 struct inet_sock *inet = inet_sk(sk);
1994 struct ip_sf_socklist *newpsl, *psl;
9951f036 1995 int leavegroup = 0;
1da177e4
LT		 1996
1997 if (!MULTICAST(addr))
1998 return -EINVAL;
1999 if (msf->imsf_fmode != MCAST_INCLUDE &&
2000 msf->imsf_fmode != MCAST_EXCLUDE)
2001 return -EINVAL;
2002
6756ae4b 2003 rtnl_lock();
1da177e4
LT		 2004
2005 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2006 imr.imr_address.s_addr = msf->imsf_interface;
2007 imr.imr_ifindex = ifindex;
2008 in_dev = ip_mc_find_dev(&imr);
2009
2010 if (!in_dev) {
2011 err = -ENODEV;
2012 goto done;
2013 }
1da177e4 2014
9951f036
DS		 2015 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2016 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2017 leavegroup = 1;
2018 goto done;
2019 }
2020
1da177e4
LT		 2021 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2022 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2023 pmc->multi.imr_ifindex == imr.imr_ifindex)
2024 break;
2025 }
917f2f10
DS		 2026 if (!pmc) { /* must have a prior join */
2027 err = -EINVAL;
1da177e4 2028 goto done;
917f2f10 2029 }
1da177e4 2030 if (msf->imsf_numsrc) {
8b3a7005
KK		 2031 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2032 GFP_KERNEL);
1da177e4
LT		 2033 if (!newpsl) {
2034 err = -ENOBUFS;
2035 goto done;
2036 }
2037 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2038 memcpy(newpsl->sl_addr, msf->imsf_slist,
2039 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2040 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2041 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2042 if (err) {
2043 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2044 goto done;
2045 }
8713dbf0 2046 } else {
1da177e4 2047 newpsl = NULL;
8713dbf0
YZ		 2048 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2049 msf->imsf_fmode, 0, NULL, 0);
2050 }
1da177e4
LT		 2051 psl = pmc->sflist;
2052 if (psl) {
2053 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2054 psl->sl_count, psl->sl_addr, 0);
2055 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2056 } else
2057 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2058 0, NULL, 0);
2059 pmc->sflist = newpsl;
2060 pmc->sfmode = msf->imsf_fmode;
917f2f10 2061 err = 0;
1da177e4 2062done:
6756ae4b 2063 rtnl_unlock();
9951f036
DS		 2064 if (leavegroup)
2065 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2066 return err;
2067}
2068
2069int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2070 struct ip_msfilter __user *optval, int __user *optlen)
2071{
2072 int err, len, count, copycount;
2073 struct ip_mreqn imr;
63007727 2074 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2075 struct ip_mc_socklist *pmc;
2076 struct in_device *in_dev;
2077 struct inet_sock *inet = inet_sk(sk);
2078 struct ip_sf_socklist *psl;
2079
2080 if (!MULTICAST(addr))
2081 return -EINVAL;
2082
6756ae4b 2083 rtnl_lock();
1da177e4
LT		 2084
2085 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2086 imr.imr_address.s_addr = msf->imsf_interface;
2087 imr.imr_ifindex = 0;
2088 in_dev = ip_mc_find_dev(&imr);
2089
2090 if (!in_dev) {
2091 err = -ENODEV;
2092 goto done;
2093 }
2094 err = -EADDRNOTAVAIL;
2095
2096 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2097 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2098 pmc->multi.imr_ifindex == imr.imr_ifindex)
2099 break;
2100 }
2101 if (!pmc) /* must have a prior join */
2102 goto done;
2103 msf->imsf_fmode = pmc->sfmode;
2104 psl = pmc->sflist;
6756ae4b 2105 rtnl_unlock();
1da177e4
LT		 2106 if (!psl) {
2107 len = 0;
2108 count = 0;
2109 } else {
2110 count = psl->sl_count;
2111 }
2112 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2113 len = copycount * sizeof(psl->sl_addr[0]);
2114 msf->imsf_numsrc = count;
2115 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2116 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2117 return -EFAULT;
2118 }
2119 if (len &&
2120 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2121 return -EFAULT;
2122 return 0;
2123done:
6756ae4b 2124 rtnl_unlock();
1da177e4
LT		 2125 return err;
2126}
2127
2128int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2129 struct group_filter __user *optval, int __user *optlen)
2130{
2131 int err, i, count, copycount;
2132 struct sockaddr_in *psin;
63007727 2133 __be32 addr;
1da177e4
LT		 2134 struct ip_mc_socklist *pmc;
2135 struct inet_sock *inet = inet_sk(sk);
2136 struct ip_sf_socklist *psl;
2137
2138 psin = (struct sockaddr_in *)&gsf->gf_group;
2139 if (psin->sin_family != AF_INET)
2140 return -EINVAL;
2141 addr = psin->sin_addr.s_addr;
2142 if (!MULTICAST(addr))
2143 return -EINVAL;
2144
6756ae4b 2145 rtnl_lock();
1da177e4
LT		 2146
2147 err = -EADDRNOTAVAIL;
2148
2149 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2150 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2151 pmc->multi.imr_ifindex == gsf->gf_interface)
2152 break;
2153 }
2154 if (!pmc) /* must have a prior join */
2155 goto done;
2156 gsf->gf_fmode = pmc->sfmode;
2157 psl = pmc->sflist;
6756ae4b 2158 rtnl_unlock();
1da177e4
LT		 2159 count = psl ? psl->sl_count : 0;
2160 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2161 gsf->gf_numsrc = count;
2162 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2163 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2164 return -EFAULT;
2165 }
2166 for (i=0; i<copycount; i++) {
2167 struct sockaddr_in *psin;
2168 struct sockaddr_storage ss;
2169
2170 psin = (struct sockaddr_in *)&ss;
2171 memset(&ss, 0, sizeof(ss));
2172 psin->sin_family = AF_INET;
2173 psin->sin_addr.s_addr = psl->sl_addr[i];
2174 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2175 return -EFAULT;
2176 }
2177 return 0;
2178done:
6756ae4b 2179 rtnl_unlock();
1da177e4
LT		 2180 return err;
2181}
2182
2183/*
2184 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2185 */
c0cda068 2186int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2187{
2188 struct inet_sock *inet = inet_sk(sk);
2189 struct ip_mc_socklist *pmc;
2190 struct ip_sf_socklist *psl;
2191 int i;
2192
2193 if (!MULTICAST(loc_addr))
2194 return 1;
2195
2196 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2197 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2198 pmc->multi.imr_ifindex == dif)
2199 break;
2200 }
2201 if (!pmc)
2202 return 1;
2203 psl = pmc->sflist;
2204 if (!psl)
2205 return pmc->sfmode == MCAST_EXCLUDE;
2206
2207 for (i=0; i<psl->sl_count; i++) {
2208 if (psl->sl_addr[i] == rmt_addr)
2209 break;
2210 }
2211 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2212 return 0;
2213 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2214 return 0;
2215 return 1;
2216}
2217
2218/*
2219 * A socket is closing.
2220 */
2221
2222void ip_mc_drop_socket(struct sock *sk)
2223{
2224 struct inet_sock *inet = inet_sk(sk);
2225 struct ip_mc_socklist *iml;
2226
2227 if (inet->mc_list == NULL)
2228 return;
2229
2230 rtnl_lock();
2231 while ((iml = inet->mc_list) != NULL) {
2232 struct in_device *in_dev;
2233 inet->mc_list = iml->next;
2234
bb699cbc
MR		 2235 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
2236 (void) ip_mc_leave_src(sk, iml, in_dev);
2237 if (in_dev != NULL) {
1da177e4
LT		 2238 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2239 in_dev_put(in_dev);
2240 }
2241 sock_kfree_s(sk, iml, sizeof(*iml));
1da177e4
LT		 2242 }
2243 rtnl_unlock();
2244}
2245
a60c4923 2246int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2247{
2248 struct ip_mc_list *im;
2249 struct ip_sf_list *psf;
2250 int rv = 0;
2251
2252 read_lock(&in_dev->mc_list_lock);
2253 for (im=in_dev->mc_list; im; im=im->next) {
2254 if (im->multiaddr == mc_addr)
2255 break;
2256 }
2257 if (im && proto == IPPROTO_IGMP) {
2258 rv = 1;
2259 } else if (im) {
2260 if (src_addr) {
2261 for (psf=im->sources; psf; psf=psf->sf_next) {
2262 if (psf->sf_inaddr == src_addr)
2263 break;
2264 }
2265 if (psf)
2266 rv = psf->sf_count[MCAST_INCLUDE] ||
2267 psf->sf_count[MCAST_EXCLUDE] !=
2268 im->sfcount[MCAST_EXCLUDE];
2269 else
2270 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2271 } else
2272 rv = 1; /* unspecified source; tentatively allow */
2273 }
2274 read_unlock(&in_dev->mc_list_lock);
2275 return rv;
2276}
2277
2278#if defined(CONFIG_PROC_FS)
2279struct igmp_mc_iter_state {
2280 struct net_device *dev;
2281 struct in_device *in_dev;
2282};
2283
2284#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2285
2286static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2287{
2288 struct ip_mc_list *im = NULL;
2289 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2290
2291 for (state->dev = dev_base, state->in_dev = NULL;
e905a9ed 2292 state->dev;
1da177e4
LT		 2293 state->dev = state->dev->next) {
2294 struct in_device *in_dev;
2295 in_dev = in_dev_get(state->dev);
2296 if (!in_dev)
2297 continue;
2298 read_lock(&in_dev->mc_list_lock);
2299 im = in_dev->mc_list;
2300 if (im) {
2301 state->in_dev = in_dev;
2302 break;
2303 }
2304 read_unlock(&in_dev->mc_list_lock);
2305 in_dev_put(in_dev);
2306 }
2307 return im;
2308}
2309
2310static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2311{
2312 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2313 im = im->next;
2314 while (!im) {
2315 if (likely(state->in_dev != NULL)) {
2316 read_unlock(&state->in_dev->mc_list_lock);
2317 in_dev_put(state->in_dev);
2318 }
2319 state->dev = state->dev->next;
2320 if (!state->dev) {
2321 state->in_dev = NULL;
2322 break;
2323 }
2324 state->in_dev = in_dev_get(state->dev);
2325 if (!state->in_dev)
2326 continue;
2327 read_lock(&state->in_dev->mc_list_lock);
2328 im = state->in_dev->mc_list;
2329 }
2330 return im;
2331}
2332
2333static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2334{
2335 struct ip_mc_list *im = igmp_mc_get_first(seq);
2336 if (im)
2337 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2338 --pos;
2339 return pos ? NULL : im;
2340}
2341
2342static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2343{
2344 read_lock(&dev_base_lock);
2345 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2346}
2347
2348static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2349{
2350 struct ip_mc_list *im;
2351 if (v == SEQ_START_TOKEN)
2352 im = igmp_mc_get_first(seq);
2353 else
2354 im = igmp_mc_get_next(seq, v);
2355 ++*pos;
2356 return im;
2357}
2358
2359static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2360{
2361 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2362 if (likely(state->in_dev != NULL)) {
2363 read_unlock(&state->in_dev->mc_list_lock);
2364 in_dev_put(state->in_dev);
2365 state->in_dev = NULL;
2366 }
2367 state->dev = NULL;
2368 read_unlock(&dev_base_lock);
2369}
2370
2371static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2372{
2373 if (v == SEQ_START_TOKEN)
e905a9ed 2374 seq_puts(seq,
1da177e4
LT		 2375 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2376 else {
2377 struct ip_mc_list *im = (struct ip_mc_list *)v;
2378 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2379 char *querier;
2380#ifdef CONFIG_IP_MULTICAST
2381 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2382 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2383 "V3";
2384#else
2385 querier = "NONE";
2386#endif
2387
2388 if (state->in_dev->mc_list == im) {
2389 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2390 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2391 }
2392
2393 seq_printf(seq,
338fcf98 2394 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4
LT		 2395 im->multiaddr, im->users,
2396 im->tm_running, im->tm_running ?
2397 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2398 im->reporter);
2399 }
2400 return 0;
2401}
2402
f690808e 2403static const struct seq_operations igmp_mc_seq_ops = {
1da177e4
LT		 2404 .start = igmp_mc_seq_start,
2405 .next = igmp_mc_seq_next,
2406 .stop = igmp_mc_seq_stop,
2407 .show = igmp_mc_seq_show,
2408};
2409
2410static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2411{
2412 struct seq_file *seq;
2413 int rc = -ENOMEM;
0da974f4 2414 struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2415
2416 if (!s)
2417 goto out;
2418 rc = seq_open(file, &igmp_mc_seq_ops);
2419 if (rc)
2420 goto out_kfree;
2421
2422 seq = file->private_data;
2423 seq->private = s;
1da177e4
LT		 2424out:
2425 return rc;
2426out_kfree:
2427 kfree(s);
2428 goto out;
2429}
2430
9a32144e 2431static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2432 .owner = THIS_MODULE,
2433 .open = igmp_mc_seq_open,
2434 .read = seq_read,
2435 .llseek = seq_lseek,
2436 .release = seq_release_private,
2437};
2438
2439struct igmp_mcf_iter_state {
2440 struct net_device *dev;
2441 struct in_device *idev;
2442 struct ip_mc_list *im;
2443};
2444
2445#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2446
2447static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2448{
2449 struct ip_sf_list *psf = NULL;
2450 struct ip_mc_list *im = NULL;
2451 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2452
2453 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
e905a9ed 2454 state->dev;
1da177e4
LT		 2455 state->dev = state->dev->next) {
2456 struct in_device *idev;
2457 idev = in_dev_get(state->dev);
2458 if (unlikely(idev == NULL))
2459 continue;
2460 read_lock(&idev->mc_list_lock);
2461 im = idev->mc_list;
2462 if (likely(im != NULL)) {
2463 spin_lock_bh(&im->lock);
2464 psf = im->sources;
2465 if (likely(psf != NULL)) {
2466 state->im = im;
2467 state->idev = idev;
2468 break;
2469 }
2470 spin_unlock_bh(&im->lock);
2471 }
2472 read_unlock(&idev->mc_list_lock);
2473 in_dev_put(idev);
2474 }
2475 return psf;
2476}
2477
2478static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2479{
2480 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2481
2482 psf = psf->sf_next;
2483 while (!psf) {
2484 spin_unlock_bh(&state->im->lock);
2485 state->im = state->im->next;
2486 while (!state->im) {
2487 if (likely(state->idev != NULL)) {
2488 read_unlock(&state->idev->mc_list_lock);
2489 in_dev_put(state->idev);
2490 }
2491 state->dev = state->dev->next;
2492 if (!state->dev) {
2493 state->idev = NULL;
2494 goto out;
2495 }
2496 state->idev = in_dev_get(state->dev);
2497 if (!state->idev)
2498 continue;
2499 read_lock(&state->idev->mc_list_lock);
2500 state->im = state->idev->mc_list;
2501 }
2502 if (!state->im)
2503 break;
2504 spin_lock_bh(&state->im->lock);
2505 psf = state->im->sources;
2506 }
2507out:
2508 return psf;
2509}
2510
2511static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2512{
2513 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2514 if (psf)
2515 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2516 --pos;
2517 return pos ? NULL : psf;
2518}
2519
2520static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2521{
2522 read_lock(&dev_base_lock);
2523 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2524}
2525
2526static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2527{
2528 struct ip_sf_list *psf;
2529 if (v == SEQ_START_TOKEN)
2530 psf = igmp_mcf_get_first(seq);
2531 else
2532 psf = igmp_mcf_get_next(seq, v);
2533 ++*pos;
2534 return psf;
2535}
2536
2537static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2538{
2539 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2540 if (likely(state->im != NULL)) {
2541 spin_unlock_bh(&state->im->lock);
2542 state->im = NULL;
2543 }
2544 if (likely(state->idev != NULL)) {
2545 read_unlock(&state->idev->mc_list_lock);
2546 in_dev_put(state->idev);
2547 state->idev = NULL;
2548 }
2549 state->dev = NULL;
2550 read_unlock(&dev_base_lock);
2551}
2552
2553static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2554{
2555 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2556 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2557
2558 if (v == SEQ_START_TOKEN) {
e905a9ed 2559 seq_printf(seq,
1da177e4
LT		 2560 "%3s %6s "
2561 "%10s %10s %6s %6s\n", "Idx",
2562 "Device", "MCA",
2563 "SRC", "INC", "EXC");
2564 } else {
2565 seq_printf(seq,
2566 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2567 "0x%08x %6lu %6lu\n",
2568 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2569 ntohl(state->im->multiaddr),
2570 ntohl(psf->sf_inaddr),
2571 psf->sf_count[MCAST_INCLUDE],
2572 psf->sf_count[MCAST_EXCLUDE]);
2573 }
2574 return 0;
2575}
2576
f690808e 2577static const struct seq_operations igmp_mcf_seq_ops = {
1da177e4
LT		 2578 .start = igmp_mcf_seq_start,
2579 .next = igmp_mcf_seq_next,
2580 .stop = igmp_mcf_seq_stop,
2581 .show = igmp_mcf_seq_show,
2582};
2583
2584static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2585{
2586 struct seq_file *seq;
2587 int rc = -ENOMEM;
0da974f4 2588 struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2589
2590 if (!s)
2591 goto out;
2592 rc = seq_open(file, &igmp_mcf_seq_ops);
2593 if (rc)
2594 goto out_kfree;
2595
2596 seq = file->private_data;
2597 seq->private = s;
1da177e4
LT		 2598out:
2599 return rc;
2600out_kfree:
2601 kfree(s);
2602 goto out;
2603}
2604
9a32144e 2605static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2606 .owner = THIS_MODULE,
2607 .open = igmp_mcf_seq_open,
2608 .read = seq_read,
2609 .llseek = seq_lseek,
2610 .release = seq_release_private,
2611};
2612
2613int __init igmp_mc_proc_init(void)
2614{
2615 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2616 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2617 return 0;
2618}
2619#endif
2620
2621EXPORT_SYMBOL(ip_mc_dec_group);
2622EXPORT_SYMBOL(ip_mc_inc_group);
2623EXPORT_SYMBOL(ip_mc_join_group);
a816c7c7 2624EXPORT_SYMBOL(ip_mc_rejoin_group);
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