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[NET]: network dev read_mostly
[GitHub/mt8127/android_kernel_alcatel_ttab.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
ACM		 317 skb_reset_network_header(skb);
318 pip = skb->nh.iph;
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{
348 struct iphdr *pip = skb->nh.iph;
349 struct igmphdr *pig = skb->h.igmph;
350 int iplen, igmplen;
351
352 iplen = skb->tail - (unsigned char *)skb->nh.iph;
353 pip->tot_len = htons(iplen);
354 ip_send_check(pip);
355
356 igmplen = skb->tail - (unsigned char *)skb->h.igmph;
357 pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen);
358
359 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
360 dst_output);
361}
362
363static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
364{
365 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
366}
367
368static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
369 int type, struct igmpv3_grec **ppgr)
370{
371 struct net_device *dev = pmc->interface->dev;
372 struct igmpv3_report *pih;
373 struct igmpv3_grec *pgr;
374
375 if (!skb)
376 skb = igmpv3_newpack(dev, dev->mtu);
377 if (!skb)
378 return NULL;
379 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
380 pgr->grec_type = type;
381 pgr->grec_auxwords = 0;
382 pgr->grec_nsrcs = 0;
383 pgr->grec_mca = pmc->multiaddr;
384 pih = (struct igmpv3_report *)skb->h.igmph;
385 pih->ngrec = htons(ntohs(pih->ngrec)+1);
386 *ppgr = pgr;
387 return skb;
388}
389
390#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
391 skb_tailroom(skb)) : 0)
392
393static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
394 int type, int gdeleted, int sdeleted)
395{
396 struct net_device *dev = pmc->interface->dev;
397 struct igmpv3_report *pih;
398 struct igmpv3_grec *pgr = NULL;
399 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
ad12583f 400 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 401
402 if (pmc->multiaddr == IGMP_ALL_HOSTS)
403 return skb;
404
405 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
406 type == IGMPV3_MODE_IS_EXCLUDE;
407 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
408 type == IGMPV3_CHANGE_TO_EXCLUDE;
409
ad12583f
DS		 410 stotal = scount = 0;
411
1da177e4
LT		 412 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
413
ad12583f
DS		 414 if (!*psf_list)
415 goto empty_source;
416
1da177e4
LT		 417 pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL;
418
419 /* EX and TO_EX get a fresh packet, if needed */
420 if (truncate) {
421 if (pih && pih->ngrec &&
422 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
423 if (skb)
424 igmpv3_sendpack(skb);
425 skb = igmpv3_newpack(dev, dev->mtu);
426 }
427 }
428 first = 1;
1da177e4
LT		 429 psf_prev = NULL;
430 for (psf=*psf_list; psf; psf=psf_next) {
ea4d9e72 431 __be32 *psrc;
1da177e4
LT		 432
433 psf_next = psf->sf_next;
434
435 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
436 psf_prev = psf;
437 continue;
438 }
439
440 /* clear marks on query responses */
441 if (isquery)
442 psf->sf_gsresp = 0;
443
63007727 444 if (AVAILABLE(skb) < sizeof(__be32) +
1da177e4
LT		 445 first*sizeof(struct igmpv3_grec)) {
446 if (truncate && !first)
447 break; /* truncate these */
448 if (pgr)
449 pgr->grec_nsrcs = htons(scount);
450 if (skb)
451 igmpv3_sendpack(skb);
452 skb = igmpv3_newpack(dev, dev->mtu);
453 first = 1;
454 scount = 0;
455 }
456 if (first) {
457 skb = add_grhead(skb, pmc, type, &pgr);
458 first = 0;
459 }
cc63f70b
AD		 460 if (!skb)
461 return NULL;
63007727 462 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
1da177e4 463 *psrc = psf->sf_inaddr;
ad12583f 464 scount++; stotal++;
1da177e4
LT		 465 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
466 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
467 psf->sf_crcount--;
468 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
469 if (psf_prev)
470 psf_prev->sf_next = psf->sf_next;
471 else
472 *psf_list = psf->sf_next;
473 kfree(psf);
474 continue;
475 }
476 }
477 psf_prev = psf;
478 }
ad12583f
DS		 479
480empty_source:
481 if (!stotal) {
482 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
483 type == IGMPV3_BLOCK_OLD_SOURCES)
484 return skb;
485 if (pmc->crcount || isquery) {
486 /* make sure we have room for group header */
487 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
488 igmpv3_sendpack(skb);
489 skb = NULL; /* add_grhead will get a new one */
490 }
491 skb = add_grhead(skb, pmc, type, &pgr);
492 }
493 }
1da177e4
LT		 494 if (pgr)
495 pgr->grec_nsrcs = htons(scount);
496
497 if (isquery)
498 pmc->gsquery = 0; /* clear query state on report */
499 return skb;
500}
501
502static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
503{
504 struct sk_buff *skb = NULL;
505 int type;
506
507 if (!pmc) {
508 read_lock(&in_dev->mc_list_lock);
509 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
510 if (pmc->multiaddr == IGMP_ALL_HOSTS)
511 continue;
512 spin_lock_bh(&pmc->lock);
513 if (pmc->sfcount[MCAST_EXCLUDE])
514 type = IGMPV3_MODE_IS_EXCLUDE;
515 else
516 type = IGMPV3_MODE_IS_INCLUDE;
517 skb = add_grec(skb, pmc, type, 0, 0);
518 spin_unlock_bh(&pmc->lock);
519 }
520 read_unlock(&in_dev->mc_list_lock);
521 } else {
522 spin_lock_bh(&pmc->lock);
523 if (pmc->sfcount[MCAST_EXCLUDE])
524 type = IGMPV3_MODE_IS_EXCLUDE;
525 else
526 type = IGMPV3_MODE_IS_INCLUDE;
527 skb = add_grec(skb, pmc, type, 0, 0);
528 spin_unlock_bh(&pmc->lock);
529 }
530 if (!skb)
531 return 0;
532 return igmpv3_sendpack(skb);
533}
534
535/*
536 * remove zero-count source records from a source filter list
537 */
538static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
539{
540 struct ip_sf_list *psf_prev, *psf_next, *psf;
541
542 psf_prev = NULL;
543 for (psf=*ppsf; psf; psf = psf_next) {
544 psf_next = psf->sf_next;
545 if (psf->sf_crcount == 0) {
546 if (psf_prev)
547 psf_prev->sf_next = psf->sf_next;
548 else
549 *ppsf = psf->sf_next;
550 kfree(psf);
551 } else
552 psf_prev = psf;
553 }
554}
555
556static void igmpv3_send_cr(struct in_device *in_dev)
557{
558 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
559 struct sk_buff *skb = NULL;
560 int type, dtype;
561
562 read_lock(&in_dev->mc_list_lock);
563 spin_lock_bh(&in_dev->mc_tomb_lock);
564
565 /* deleted MCA's */
566 pmc_prev = NULL;
567 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
568 pmc_next = pmc->next;
569 if (pmc->sfmode == MCAST_INCLUDE) {
570 type = IGMPV3_BLOCK_OLD_SOURCES;
571 dtype = IGMPV3_BLOCK_OLD_SOURCES;
572 skb = add_grec(skb, pmc, type, 1, 0);
573 skb = add_grec(skb, pmc, dtype, 1, 1);
574 }
575 if (pmc->crcount) {
1da177e4
LT		 576 if (pmc->sfmode == MCAST_EXCLUDE) {
577 type = IGMPV3_CHANGE_TO_INCLUDE;
578 skb = add_grec(skb, pmc, type, 1, 0);
579 }
ad12583f 580 pmc->crcount--;
1da177e4
LT		 581 if (pmc->crcount == 0) {
582 igmpv3_clear_zeros(&pmc->tomb);
583 igmpv3_clear_zeros(&pmc->sources);
584 }
585 }
586 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
587 if (pmc_prev)
588 pmc_prev->next = pmc_next;
589 else
590 in_dev->mc_tomb = pmc_next;
591 in_dev_put(pmc->interface);
592 kfree(pmc);
593 } else
594 pmc_prev = pmc;
595 }
596 spin_unlock_bh(&in_dev->mc_tomb_lock);
597
598 /* change recs */
599 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
600 spin_lock_bh(&pmc->lock);
601 if (pmc->sfcount[MCAST_EXCLUDE]) {
602 type = IGMPV3_BLOCK_OLD_SOURCES;
603 dtype = IGMPV3_ALLOW_NEW_SOURCES;
604 } else {
605 type = IGMPV3_ALLOW_NEW_SOURCES;
606 dtype = IGMPV3_BLOCK_OLD_SOURCES;
607 }
608 skb = add_grec(skb, pmc, type, 0, 0);
609 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
610
611 /* filter mode changes */
612 if (pmc->crcount) {
1da177e4
LT		 613 if (pmc->sfmode == MCAST_EXCLUDE)
614 type = IGMPV3_CHANGE_TO_EXCLUDE;
615 else
616 type = IGMPV3_CHANGE_TO_INCLUDE;
617 skb = add_grec(skb, pmc, type, 0, 0);
ad12583f 618 pmc->crcount--;
1da177e4
LT		 619 }
620 spin_unlock_bh(&pmc->lock);
621 }
622 read_unlock(&in_dev->mc_list_lock);
623
624 if (!skb)
625 return;
626 (void) igmpv3_sendpack(skb);
627}
628
629static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
630 int type)
631{
632 struct sk_buff *skb;
633 struct iphdr *iph;
634 struct igmphdr *ih;
635 struct rtable *rt;
636 struct net_device *dev = in_dev->dev;
63007727
AV		 637 __be32 group = pmc ? pmc->multiaddr : 0;
638 __be32 dst;
1da177e4
LT		 639
640 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
641 return igmpv3_send_report(in_dev, pmc);
642 else if (type == IGMP_HOST_LEAVE_MESSAGE)
643 dst = IGMP_ALL_ROUTER;
644 else
645 dst = group;
646
647 {
648 struct flowi fl = { .oif = dev->ifindex,
649 .nl_u = { .ip4_u = { .daddr = dst } },
650 .proto = IPPROTO_IGMP };
651 if (ip_route_output_key(&rt, &fl))
652 return -1;
653 }
654 if (rt->rt_src == 0) {
655 ip_rt_put(rt);
656 return -1;
657 }
658
659 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
660 if (skb == NULL) {
661 ip_rt_put(rt);
662 return -1;
663 }
664
665 skb->dst = &rt->u.dst;
666
667 skb_reserve(skb, LL_RESERVED_SPACE(dev));
668
7e28ecc2
ACM		 669 skb_reset_network_header(skb);
670 iph = skb->nh.iph;
671 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 672
673 iph->version = 4;
674 iph->ihl = (sizeof(struct iphdr)+4)>>2;
675 iph->tos = 0xc0;
676 iph->frag_off = htons(IP_DF);
677 iph->ttl = 1;
678 iph->daddr = dst;
679 iph->saddr = rt->rt_src;
680 iph->protocol = IPPROTO_IGMP;
681 iph->tot_len = htons(IGMP_SIZE);
682 ip_select_ident(iph, &rt->u.dst, NULL);
683 ((u8*)&iph[1])[0] = IPOPT_RA;
684 ((u8*)&iph[1])[1] = 4;
685 ((u8*)&iph[1])[2] = 0;
686 ((u8*)&iph[1])[3] = 0;
687 ip_send_check(iph);
688
689 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
690 ih->type=type;
691 ih->code=0;
692 ih->csum=0;
693 ih->group=group;
694 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
695
696 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
697 dst_output);
698}
699
700static void igmp_gq_timer_expire(unsigned long data)
701{
702 struct in_device *in_dev = (struct in_device *)data;
703
704 in_dev->mr_gq_running = 0;
705 igmpv3_send_report(in_dev, NULL);
706 __in_dev_put(in_dev);
707}
708
709static void igmp_ifc_timer_expire(unsigned long data)
710{
711 struct in_device *in_dev = (struct in_device *)data;
712
713 igmpv3_send_cr(in_dev);
714 if (in_dev->mr_ifc_count) {
715 in_dev->mr_ifc_count--;
716 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
717 }
718 __in_dev_put(in_dev);
719}
720
721static void igmp_ifc_event(struct in_device *in_dev)
722{
723 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
724 return;
e905a9ed 725 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 726 IGMP_Unsolicited_Report_Count;
727 igmp_ifc_start_timer(in_dev, 1);
728}
729
730
731static void igmp_timer_expire(unsigned long data)
732{
733 struct ip_mc_list *im=(struct ip_mc_list *)data;
734 struct in_device *in_dev = im->interface;
735
736 spin_lock(&im->lock);
737 im->tm_running=0;
738
739 if (im->unsolicit_count) {
740 im->unsolicit_count--;
741 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
742 }
743 im->reporter = 1;
744 spin_unlock(&im->lock);
745
746 if (IGMP_V1_SEEN(in_dev))
747 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
748 else if (IGMP_V2_SEEN(in_dev))
749 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
750 else
751 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
752
753 ip_ma_put(im);
754}
755
ad12583f 756/* mark EXCLUDE-mode sources */
ea4d9e72 757static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 758{
759 struct ip_sf_list *psf;
760 int i, scount;
761
ad12583f
DS		 762 scount = 0;
763 for (psf=pmc->sources; psf; psf=psf->sf_next) {
764 if (scount == nsrcs)
765 break;
766 for (i=0; i<nsrcs; i++) {
767 /* skip inactive filters */
768 if (pmc->sfcount[MCAST_INCLUDE] ||
769 pmc->sfcount[MCAST_EXCLUDE] !=
770 psf->sf_count[MCAST_EXCLUDE])
771 continue;
772 if (srcs[i] == psf->sf_inaddr) {
773 scount++;
774 break;
775 }
776 }
777 }
778 pmc->gsquery = 0;
779 if (scount == nsrcs) /* all sources excluded */
780 return 0;
781 return 1;
782}
783
ea4d9e72 784static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 785{
786 struct ip_sf_list *psf;
787 int i, scount;
788
789 if (pmc->sfmode == MCAST_EXCLUDE)
790 return igmp_xmarksources(pmc, nsrcs, srcs);
791
792 /* mark INCLUDE-mode sources */
1da177e4
LT		 793 scount = 0;
794 for (psf=pmc->sources; psf; psf=psf->sf_next) {
795 if (scount == nsrcs)
796 break;
797 for (i=0; i<nsrcs; i++)
798 if (srcs[i] == psf->sf_inaddr) {
799 psf->sf_gsresp = 1;
800 scount++;
801 break;
802 }
803 }
ad12583f
DS		 804 if (!scount) {
805 pmc->gsquery = 0;
806 return 0;
807 }
808 pmc->gsquery = 1;
809 return 1;
1da177e4
LT		 810}
811
63007727 812static void igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 813{
814 struct ip_mc_list *im;
815
816 /* Timers are only set for non-local groups */
817
818 if (group == IGMP_ALL_HOSTS)
819 return;
820
821 read_lock(&in_dev->mc_list_lock);
822 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
823 if (im->multiaddr == group) {
824 igmp_stop_timer(im);
825 break;
826 }
827 }
828 read_unlock(&in_dev->mc_list_lock);
829}
830
831static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
832 int len)
833{
834 struct igmphdr *ih = skb->h.igmph;
835 struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
836 struct ip_mc_list *im;
63007727 837 __be32 group = ih->group;
1da177e4
LT		 838 int max_delay;
839 int mark = 0;
840
841
842 if (len == 8) {
843 if (ih->code == 0) {
844 /* Alas, old v1 router presents here. */
e905a9ed 845
1da177e4
LT		 846 max_delay = IGMP_Query_Response_Interval;
847 in_dev->mr_v1_seen = jiffies +
848 IGMP_V1_Router_Present_Timeout;
849 group = 0;
850 } else {
851 /* v2 router present */
852 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
853 in_dev->mr_v2_seen = jiffies +
854 IGMP_V2_Router_Present_Timeout;
855 }
856 /* cancel the interface change timer */
857 in_dev->mr_ifc_count = 0;
858 if (del_timer(&in_dev->mr_ifc_timer))
859 __in_dev_put(in_dev);
860 /* clear deleted report items */
861 igmpv3_clear_delrec(in_dev);
862 } else if (len < 12) {
863 return; /* ignore bogus packet; freed by caller */
864 } else { /* v3 */
865 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
866 return;
e905a9ed 867
1da177e4
LT		 868 ih3 = (struct igmpv3_query *) skb->h.raw;
869 if (ih3->nsrcs) {
e905a9ed 870 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 871 + ntohs(ih3->nsrcs)*sizeof(__be32)))
1da177e4
LT		 872 return;
873 ih3 = (struct igmpv3_query *) skb->h.raw;
874 }
875
876 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
877 if (!max_delay)
878 max_delay = 1; /* can't mod w/ 0 */
879 in_dev->mr_maxdelay = max_delay;
880 if (ih3->qrv)
881 in_dev->mr_qrv = ih3->qrv;
882 if (!group) { /* general query */
883 if (ih3->nsrcs)
884 return; /* no sources allowed */
885 igmp_gq_start_timer(in_dev);
886 return;
887 }
888 /* mark sources to include, if group & source-specific */
889 mark = ih3->nsrcs != 0;
890 }
891
892 /*
893 * - Start the timers in all of our membership records
894 * that the query applies to for the interface on
895 * which the query arrived excl. those that belong
896 * to a "local" group (224.0.0.X)
897 * - For timers already running check if they need to
898 * be reset.
899 * - Use the igmp->igmp_code field as the maximum
900 * delay possible
901 */
902 read_lock(&in_dev->mc_list_lock);
903 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
ad12583f
DS		 904 int changed;
905
1da177e4
LT		 906 if (group && group != im->multiaddr)
907 continue;
908 if (im->multiaddr == IGMP_ALL_HOSTS)
909 continue;
910 spin_lock_bh(&im->lock);
911 if (im->tm_running)
912 im->gsquery = im->gsquery && mark;
913 else
914 im->gsquery = mark;
ad12583f 915 changed = !im->gsquery ||
e905a9ed 916 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 917 spin_unlock_bh(&im->lock);
ad12583f
DS		 918 if (changed)
919 igmp_mod_timer(im, max_delay);
1da177e4
LT		 920 }
921 read_unlock(&in_dev->mc_list_lock);
922}
923
924int igmp_rcv(struct sk_buff *skb)
925{
926 /* This basically follows the spec line by line -- see RFC1112 */
927 struct igmphdr *ih;
928 struct in_device *in_dev = in_dev_get(skb->dev);
929 int len = skb->len;
930
931 if (in_dev==NULL) {
932 kfree_skb(skb);
933 return 0;
934 }
935
fb286bb2
HX		 936 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
937 goto drop;
938
939 switch (skb->ip_summed) {
84fa7933 940 case CHECKSUM_COMPLETE:
d3bc23e7 941 if (!csum_fold(skb->csum))
fb286bb2
HX		 942 break;
943 /* fall through */
944 case CHECKSUM_NONE:
945 skb->csum = 0;
946 if (__skb_checksum_complete(skb))
947 goto drop;
1da177e4
LT		 948 }
949
950 ih = skb->h.igmph;
951 switch (ih->type) {
952 case IGMP_HOST_MEMBERSHIP_QUERY:
953 igmp_heard_query(in_dev, skb, len);
954 break;
955 case IGMP_HOST_MEMBERSHIP_REPORT:
956 case IGMPV2_HOST_MEMBERSHIP_REPORT:
957 case IGMPV3_HOST_MEMBERSHIP_REPORT:
958 /* Is it our report looped back? */
959 if (((struct rtable*)skb->dst)->fl.iif == 0)
960 break;
24c69275
DS		 961 /* don't rely on MC router hearing unicast reports */
962 if (skb->pkt_type == PACKET_MULTICAST ||
963 skb->pkt_type == PACKET_BROADCAST)
964 igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 965 break;
966 case IGMP_PIM:
967#ifdef CONFIG_IP_PIMSM_V1
968 in_dev_put(in_dev);
969 return pim_rcv_v1(skb);
970#endif
971 case IGMP_DVMRP:
972 case IGMP_TRACE:
973 case IGMP_HOST_LEAVE_MESSAGE:
974 case IGMP_MTRACE:
975 case IGMP_MTRACE_RESP:
976 break;
977 default:
dd1c1853 978 break;
1da177e4 979 }
fb286bb2
HX		 980
981drop:
1da177e4
LT		 982 in_dev_put(in_dev);
983 kfree_skb(skb);
984 return 0;
985}
986
987#endif
988
989
990/*
991 * Add a filter to a device
992 */
993
63007727 994static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 995{
996 char buf[MAX_ADDR_LEN];
997 struct net_device *dev = in_dev->dev;
998
999 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1000 We will get multicast token leakage, when IFF_MULTICAST
1001 is changed. This check should be done in dev->set_multicast_list
1002 routine. Something sort of:
1003 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1004 --ANK
1005 */
1006 if (arp_mc_map(addr, buf, dev, 0) == 0)
1007 dev_mc_add(dev,buf,dev->addr_len,0);
1008}
1009
1010/*
1011 * Remove a filter from a device
1012 */
1013
63007727 1014static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1015{
1016 char buf[MAX_ADDR_LEN];
1017 struct net_device *dev = in_dev->dev;
1018
1019 if (arp_mc_map(addr, buf, dev, 0) == 0)
1020 dev_mc_delete(dev,buf,dev->addr_len,0);
1021}
1022
1023#ifdef CONFIG_IP_MULTICAST
1024/*
1025 * deleted ip_mc_list manipulation
1026 */
1027static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1028{
1029 struct ip_mc_list *pmc;
1030
1031 /* this is an "ip_mc_list" for convenience; only the fields below
1032 * are actually used. In particular, the refcnt and users are not
1033 * used for management of the delete list. Using the same structure
1034 * for deleted items allows change reports to use common code with
1035 * non-deleted or query-response MCA's.
1036 */
0da974f4 1037 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1038 if (!pmc)
1039 return;
1da177e4
LT		 1040 spin_lock_bh(&im->lock);
1041 pmc->interface = im->interface;
1042 in_dev_hold(in_dev);
1043 pmc->multiaddr = im->multiaddr;
1044 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1045 IGMP_Unsolicited_Report_Count;
1046 pmc->sfmode = im->sfmode;
1047 if (pmc->sfmode == MCAST_INCLUDE) {
1048 struct ip_sf_list *psf;
1049
1050 pmc->tomb = im->tomb;
1051 pmc->sources = im->sources;
1052 im->tomb = im->sources = NULL;
1053 for (psf=pmc->sources; psf; psf=psf->sf_next)
1054 psf->sf_crcount = pmc->crcount;
1055 }
1056 spin_unlock_bh(&im->lock);
1057
1058 spin_lock_bh(&in_dev->mc_tomb_lock);
1059 pmc->next = in_dev->mc_tomb;
1060 in_dev->mc_tomb = pmc;
1061 spin_unlock_bh(&in_dev->mc_tomb_lock);
1062}
1063
63007727 1064static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1065{
1066 struct ip_mc_list *pmc, *pmc_prev;
1067 struct ip_sf_list *psf, *psf_next;
1068
1069 spin_lock_bh(&in_dev->mc_tomb_lock);
1070 pmc_prev = NULL;
1071 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1072 if (pmc->multiaddr == multiaddr)
1073 break;
1074 pmc_prev = pmc;
1075 }
1076 if (pmc) {
1077 if (pmc_prev)
1078 pmc_prev->next = pmc->next;
1079 else
1080 in_dev->mc_tomb = pmc->next;
1081 }
1082 spin_unlock_bh(&in_dev->mc_tomb_lock);
1083 if (pmc) {
1084 for (psf=pmc->tomb; psf; psf=psf_next) {
1085 psf_next = psf->sf_next;
1086 kfree(psf);
1087 }
1088 in_dev_put(pmc->interface);
1089 kfree(pmc);
1090 }
1091}
1092
1093static void igmpv3_clear_delrec(struct in_device *in_dev)
1094{
1095 struct ip_mc_list *pmc, *nextpmc;
1096
1097 spin_lock_bh(&in_dev->mc_tomb_lock);
1098 pmc = in_dev->mc_tomb;
1099 in_dev->mc_tomb = NULL;
1100 spin_unlock_bh(&in_dev->mc_tomb_lock);
1101
1102 for (; pmc; pmc = nextpmc) {
1103 nextpmc = pmc->next;
1104 ip_mc_clear_src(pmc);
1105 in_dev_put(pmc->interface);
1106 kfree(pmc);
1107 }
1108 /* clear dead sources, too */
1109 read_lock(&in_dev->mc_list_lock);
1110 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1111 struct ip_sf_list *psf, *psf_next;
1112
1113 spin_lock_bh(&pmc->lock);
1114 psf = pmc->tomb;
1115 pmc->tomb = NULL;
1116 spin_unlock_bh(&pmc->lock);
1117 for (; psf; psf=psf_next) {
1118 psf_next = psf->sf_next;
1119 kfree(psf);
1120 }
1121 }
1122 read_unlock(&in_dev->mc_list_lock);
1123}
1124#endif
1125
1126static void igmp_group_dropped(struct ip_mc_list *im)
1127{
1128 struct in_device *in_dev = im->interface;
1129#ifdef CONFIG_IP_MULTICAST
1130 int reporter;
1131#endif
1132
1133 if (im->loaded) {
1134 im->loaded = 0;
1135 ip_mc_filter_del(in_dev, im->multiaddr);
1136 }
1137
1138#ifdef CONFIG_IP_MULTICAST
1139 if (im->multiaddr == IGMP_ALL_HOSTS)
1140 return;
1141
1142 reporter = im->reporter;
1143 igmp_stop_timer(im);
1144
1145 if (!in_dev->dead) {
1146 if (IGMP_V1_SEEN(in_dev))
1147 goto done;
1148 if (IGMP_V2_SEEN(in_dev)) {
1149 if (reporter)
1150 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1151 goto done;
1152 }
1153 /* IGMPv3 */
1154 igmpv3_add_delrec(in_dev, im);
1155
1156 igmp_ifc_event(in_dev);
1157 }
1158done:
1159#endif
1160 ip_mc_clear_src(im);
1161}
1162
1163static void igmp_group_added(struct ip_mc_list *im)
1164{
1165 struct in_device *in_dev = im->interface;
1166
1167 if (im->loaded == 0) {
1168 im->loaded = 1;
1169 ip_mc_filter_add(in_dev, im->multiaddr);
1170 }
1171
1172#ifdef CONFIG_IP_MULTICAST
1173 if (im->multiaddr == IGMP_ALL_HOSTS)
1174 return;
1175
1176 if (in_dev->dead)
1177 return;
1178 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1179 spin_lock_bh(&im->lock);
1180 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1181 spin_unlock_bh(&im->lock);
1182 return;
1183 }
1184 /* else, v3 */
1185
1186 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1187 IGMP_Unsolicited_Report_Count;
1188 igmp_ifc_event(in_dev);
1189#endif
1190}
1191
1192
1193/*
1194 * Multicast list managers
1195 */
1196
1197
1198/*
1199 * A socket has joined a multicast group on device dev.
1200 */
1201
8f935bbd 1202void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1203{
1204 struct ip_mc_list *im;
1205
1206 ASSERT_RTNL();
1207
1208 for (im=in_dev->mc_list; im; im=im->next) {
1209 if (im->multiaddr == addr) {
1210 im->users++;
1211 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1212 goto out;
1213 }
1214 }
1215
8b3a7005 1216 im = kmalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1217 if (!im)
1218 goto out;
1219
1220 im->users=1;
1221 im->interface=in_dev;
1222 in_dev_hold(in_dev);
1223 im->multiaddr=addr;
1224 /* initial mode is (EX, empty) */
1225 im->sfmode = MCAST_EXCLUDE;
1226 im->sfcount[MCAST_INCLUDE] = 0;
1227 im->sfcount[MCAST_EXCLUDE] = 1;
1228 im->sources = NULL;
1229 im->tomb = NULL;
1230 im->crcount = 0;
1231 atomic_set(&im->refcnt, 1);
1232 spin_lock_init(&im->lock);
1233#ifdef CONFIG_IP_MULTICAST
1234 im->tm_running=0;
1235 init_timer(&im->timer);
1236 im->timer.data=(unsigned long)im;
1237 im->timer.function=&igmp_timer_expire;
1238 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1239 im->reporter = 0;
1240 im->gsquery = 0;
1241#endif
1242 im->loaded = 0;
1243 write_lock_bh(&in_dev->mc_list_lock);
1244 im->next=in_dev->mc_list;
1245 in_dev->mc_list=im;
1246 write_unlock_bh(&in_dev->mc_list_lock);
1247#ifdef CONFIG_IP_MULTICAST
1248 igmpv3_del_delrec(in_dev, im->multiaddr);
1249#endif
1250 igmp_group_added(im);
1251 if (!in_dev->dead)
1252 ip_rt_multicast_event(in_dev);
1253out:
1254 return;
1255}
1256
a816c7c7
JV		 1257/*
1258 * Resend IGMP JOIN report; used for bonding.
1259 */
1260void ip_mc_rejoin_group(struct ip_mc_list *im)
1261{
08882669 1262#ifdef CONFIG_IP_MULTICAST
a816c7c7
JV		 1263 struct in_device *in_dev = im->interface;
1264
a816c7c7
JV		 1265 if (im->multiaddr == IGMP_ALL_HOSTS)
1266 return;
1267
1268 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1269 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1270 return;
1271 }
1272 /* else, v3 */
1273 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1274 IGMP_Unsolicited_Report_Count;
1275 igmp_ifc_event(in_dev);
1276#endif
1277}
1278
1da177e4
LT		 1279/*
1280 * A socket has left a multicast group on device dev
1281 */
1282
8f935bbd 1283void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1284{
1285 struct ip_mc_list *i, **ip;
e905a9ed 1286
1da177e4 1287 ASSERT_RTNL();
e905a9ed 1288
1da177e4
LT		 1289 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1290 if (i->multiaddr==addr) {
1291 if (--i->users == 0) {
1292 write_lock_bh(&in_dev->mc_list_lock);
1293 *ip = i->next;
1294 write_unlock_bh(&in_dev->mc_list_lock);
1295 igmp_group_dropped(i);
1296
1297 if (!in_dev->dead)
1298 ip_rt_multicast_event(in_dev);
1299
1300 ip_ma_put(i);
1301 return;
1302 }
1303 break;
1304 }
1305 }
1306}
1307
1308/* Device going down */
1309
1310void ip_mc_down(struct in_device *in_dev)
1311{
1312 struct ip_mc_list *i;
1313
1314 ASSERT_RTNL();
1315
1316 for (i=in_dev->mc_list; i; i=i->next)
1317 igmp_group_dropped(i);
1318
1319#ifdef CONFIG_IP_MULTICAST
1320 in_dev->mr_ifc_count = 0;
1321 if (del_timer(&in_dev->mr_ifc_timer))
1322 __in_dev_put(in_dev);
1323 in_dev->mr_gq_running = 0;
1324 if (del_timer(&in_dev->mr_gq_timer))
1325 __in_dev_put(in_dev);
1326 igmpv3_clear_delrec(in_dev);
1327#endif
1328
1329 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1330}
1331
1332void ip_mc_init_dev(struct in_device *in_dev)
1333{
1334 ASSERT_RTNL();
1335
1336 in_dev->mc_tomb = NULL;
1337#ifdef CONFIG_IP_MULTICAST
1338 in_dev->mr_gq_running = 0;
1339 init_timer(&in_dev->mr_gq_timer);
1340 in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1341 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1342 in_dev->mr_ifc_count = 0;
1343 init_timer(&in_dev->mr_ifc_timer);
1344 in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1345 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1346 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1347#endif
1348
1349 rwlock_init(&in_dev->mc_list_lock);
1350 spin_lock_init(&in_dev->mc_tomb_lock);
1351}
1352
1353/* Device going up */
1354
1355void ip_mc_up(struct in_device *in_dev)
1356{
1357 struct ip_mc_list *i;
1358
1359 ASSERT_RTNL();
1360
1361 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1362
1363 for (i=in_dev->mc_list; i; i=i->next)
1364 igmp_group_added(i);
1365}
1366
1367/*
1368 * Device is about to be destroyed: clean up.
1369 */
1370
1371void ip_mc_destroy_dev(struct in_device *in_dev)
1372{
1373 struct ip_mc_list *i;
1374
1375 ASSERT_RTNL();
1376
1377 /* Deactivate timers */
1378 ip_mc_down(in_dev);
1379
1380 write_lock_bh(&in_dev->mc_list_lock);
1381 while ((i = in_dev->mc_list) != NULL) {
1382 in_dev->mc_list = i->next;
1383 write_unlock_bh(&in_dev->mc_list_lock);
1384
1385 igmp_group_dropped(i);
1386 ip_ma_put(i);
1387
1388 write_lock_bh(&in_dev->mc_list_lock);
1389 }
1390 write_unlock_bh(&in_dev->mc_list_lock);
1391}
1392
1393static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1394{
1395 struct flowi fl = { .nl_u = { .ip4_u =
1396 { .daddr = imr->imr_multiaddr.s_addr } } };
1397 struct rtable *rt;
1398 struct net_device *dev = NULL;
1399 struct in_device *idev = NULL;
1400
1401 if (imr->imr_ifindex) {
1402 idev = inetdev_by_index(imr->imr_ifindex);
1403 if (idev)
1404 __in_dev_put(idev);
1405 return idev;
1406 }
1407 if (imr->imr_address.s_addr) {
1408 dev = ip_dev_find(imr->imr_address.s_addr);
1409 if (!dev)
1410 return NULL;
15333061 1411 dev_put(dev);
1da177e4
LT		 1412 }
1413
1414 if (!dev && !ip_route_output_key(&rt, &fl)) {
1415 dev = rt->u.dst.dev;
1416 ip_rt_put(rt);
1417 }
1418 if (dev) {
1419 imr->imr_ifindex = dev->ifindex;
e5ed6399 1420 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1421 }
1422 return idev;
1423}
1424
1425/*
1426 * Join a socket to a group
1427 */
ab32ea5d
BH		 1428int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1429int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1da177e4
LT		 1430
1431
1432static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1433 __be32 *psfsrc)
1da177e4
LT		 1434{
1435 struct ip_sf_list *psf, *psf_prev;
1436 int rv = 0;
1437
1438 psf_prev = NULL;
1439 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1440 if (psf->sf_inaddr == *psfsrc)
1441 break;
1442 psf_prev = psf;
1443 }
1444 if (!psf || psf->sf_count[sfmode] == 0) {
1445 /* source filter not found, or count wrong => bug */
1446 return -ESRCH;
1447 }
1448 psf->sf_count[sfmode]--;
1449 if (psf->sf_count[sfmode] == 0) {
1450 ip_rt_multicast_event(pmc->interface);
1451 }
1452 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1453#ifdef CONFIG_IP_MULTICAST
1454 struct in_device *in_dev = pmc->interface;
1455#endif
1456
1457 /* no more filters for this source */
1458 if (psf_prev)
1459 psf_prev->sf_next = psf->sf_next;
1460 else
1461 pmc->sources = psf->sf_next;
1462#ifdef CONFIG_IP_MULTICAST
1463 if (psf->sf_oldin &&
1464 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
e905a9ed 1465 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1466 IGMP_Unsolicited_Report_Count;
1467 psf->sf_next = pmc->tomb;
1468 pmc->tomb = psf;
1469 rv = 1;
1470 } else
1471#endif
1472 kfree(psf);
1473 }
1474 return rv;
1475}
1476
1477#ifndef CONFIG_IP_MULTICAST
1478#define igmp_ifc_event(x) do { } while (0)
1479#endif
1480
8f935bbd
AV		 1481static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1482 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1483{
1484 struct ip_mc_list *pmc;
1485 int changerec = 0;
1486 int i, err;
1487
1488 if (!in_dev)
1489 return -ENODEV;
1490 read_lock(&in_dev->mc_list_lock);
1491 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1492 if (*pmca == pmc->multiaddr)
1493 break;
1494 }
1495 if (!pmc) {
1496 /* MCA not found?? bug */
1497 read_unlock(&in_dev->mc_list_lock);
1498 return -ESRCH;
1499 }
1500 spin_lock_bh(&pmc->lock);
1501 read_unlock(&in_dev->mc_list_lock);
1502#ifdef CONFIG_IP_MULTICAST
1503 sf_markstate(pmc);
1504#endif
1505 if (!delta) {
1506 err = -EINVAL;
1507 if (!pmc->sfcount[sfmode])
1508 goto out_unlock;
1509 pmc->sfcount[sfmode]--;
1510 }
1511 err = 0;
1512 for (i=0; i<sfcount; i++) {
1513 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1514
1515 changerec |= rv > 0;
1516 if (!err && rv < 0)
1517 err = rv;
1518 }
1519 if (pmc->sfmode == MCAST_EXCLUDE &&
1520 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1521 pmc->sfcount[MCAST_INCLUDE]) {
1522#ifdef CONFIG_IP_MULTICAST
1523 struct ip_sf_list *psf;
1524#endif
1525
1526 /* filter mode change */
1527 pmc->sfmode = MCAST_INCLUDE;
1528#ifdef CONFIG_IP_MULTICAST
e905a9ed 1529 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1530 IGMP_Unsolicited_Report_Count;
1531 in_dev->mr_ifc_count = pmc->crcount;
1532 for (psf=pmc->sources; psf; psf = psf->sf_next)
1533 psf->sf_crcount = 0;
1534 igmp_ifc_event(pmc->interface);
1535 } else if (sf_setstate(pmc) || changerec) {
1536 igmp_ifc_event(pmc->interface);
1537#endif
1538 }
1539out_unlock:
1540 spin_unlock_bh(&pmc->lock);
1541 return err;
1542}
1543
1544/*
1545 * Add multicast single-source filter to the interface list
1546 */
1547static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1548 __be32 *psfsrc, int delta)
1da177e4
LT		 1549{
1550 struct ip_sf_list *psf, *psf_prev;
1551
1552 psf_prev = NULL;
1553 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1554 if (psf->sf_inaddr == *psfsrc)
1555 break;
1556 psf_prev = psf;
1557 }
1558 if (!psf) {
0da974f4 1559 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1560 if (!psf)
1561 return -ENOBUFS;
1da177e4
LT		 1562 psf->sf_inaddr = *psfsrc;
1563 if (psf_prev) {
1564 psf_prev->sf_next = psf;
1565 } else
1566 pmc->sources = psf;
1567 }
1568 psf->sf_count[sfmode]++;
1569 if (psf->sf_count[sfmode] == 1) {
1570 ip_rt_multicast_event(pmc->interface);
1571 }
1572 return 0;
1573}
1574
1575#ifdef CONFIG_IP_MULTICAST
1576static void sf_markstate(struct ip_mc_list *pmc)
1577{
1578 struct ip_sf_list *psf;
1579 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1580
1581 for (psf=pmc->sources; psf; psf=psf->sf_next)
1582 if (pmc->sfcount[MCAST_EXCLUDE]) {
1583 psf->sf_oldin = mca_xcount ==
1584 psf->sf_count[MCAST_EXCLUDE] &&
1585 !psf->sf_count[MCAST_INCLUDE];
1586 } else
1587 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1588}
1589
1590static int sf_setstate(struct ip_mc_list *pmc)
1591{
ad12583f 1592 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1593 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1594 int qrv = pmc->interface->mr_qrv;
1595 int new_in, rv;
1596
1597 rv = 0;
1598 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1599 if (pmc->sfcount[MCAST_EXCLUDE]) {
1600 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1601 !psf->sf_count[MCAST_INCLUDE];
1602 } else
1603 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1604 if (new_in) {
1605 if (!psf->sf_oldin) {
76edc605 1606 struct ip_sf_list *prev = NULL;
ad12583f
DS		 1607
1608 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1609 if (dpsf->sf_inaddr == psf->sf_inaddr)
1610 break;
1611 prev = dpsf;
1612 }
1613 if (dpsf) {
1614 if (prev)
1615 prev->sf_next = dpsf->sf_next;
1616 else
1617 pmc->tomb = dpsf->sf_next;
1618 kfree(dpsf);
1619 }
1620 psf->sf_crcount = qrv;
1621 rv++;
1622 }
1623 } else if (psf->sf_oldin) {
1624
1625 psf->sf_crcount = 0;
1626 /*
1627 * add or update "delete" records if an active filter
1628 * is now inactive
1629 */
1630 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1631 if (dpsf->sf_inaddr == psf->sf_inaddr)
1632 break;
1633 if (!dpsf) {
1634 dpsf = (struct ip_sf_list *)
1635 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1636 if (!dpsf)
1637 continue;
1638 *dpsf = *psf;
1639 /* pmc->lock held by callers */
1640 dpsf->sf_next = pmc->tomb;
1641 pmc->tomb = dpsf;
1642 }
1643 dpsf->sf_crcount = qrv;
1da177e4
LT		 1644 rv++;
1645 }
1646 }
1647 return rv;
1648}
1649#endif
1650
1651/*
1652 * Add multicast source filter list to the interface list
1653 */
8f935bbd
AV		 1654static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1655 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1656{
1657 struct ip_mc_list *pmc;
1658 int isexclude;
1659 int i, err;
1660
1661 if (!in_dev)
1662 return -ENODEV;
1663 read_lock(&in_dev->mc_list_lock);
1664 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1665 if (*pmca == pmc->multiaddr)
1666 break;
1667 }
1668 if (!pmc) {
1669 /* MCA not found?? bug */
1670 read_unlock(&in_dev->mc_list_lock);
1671 return -ESRCH;
1672 }
1673 spin_lock_bh(&pmc->lock);
1674 read_unlock(&in_dev->mc_list_lock);
1675
1676#ifdef CONFIG_IP_MULTICAST
1677 sf_markstate(pmc);
1678#endif
1679 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1680 if (!delta)
1681 pmc->sfcount[sfmode]++;
1682 err = 0;
1683 for (i=0; i<sfcount; i++) {
1684 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1685 if (err)
1686 break;
1687 }
1688 if (err) {
1689 int j;
1690
1691 pmc->sfcount[sfmode]--;
1692 for (j=0; j<i; j++)
1693 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1694 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1695#ifdef CONFIG_IP_MULTICAST
1696 struct in_device *in_dev = pmc->interface;
1697 struct ip_sf_list *psf;
1698#endif
1699
1700 /* filter mode change */
1701 if (pmc->sfcount[MCAST_EXCLUDE])
1702 pmc->sfmode = MCAST_EXCLUDE;
1703 else if (pmc->sfcount[MCAST_INCLUDE])
1704 pmc->sfmode = MCAST_INCLUDE;
1705#ifdef CONFIG_IP_MULTICAST
1706 /* else no filters; keep old mode for reports */
1707
e905a9ed 1708 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1709 IGMP_Unsolicited_Report_Count;
1710 in_dev->mr_ifc_count = pmc->crcount;
1711 for (psf=pmc->sources; psf; psf = psf->sf_next)
1712 psf->sf_crcount = 0;
1713 igmp_ifc_event(in_dev);
1714 } else if (sf_setstate(pmc)) {
1715 igmp_ifc_event(in_dev);
1716#endif
1717 }
1718 spin_unlock_bh(&pmc->lock);
1719 return err;
1720}
1721
1722static void ip_mc_clear_src(struct ip_mc_list *pmc)
1723{
1724 struct ip_sf_list *psf, *nextpsf;
1725
1726 for (psf=pmc->tomb; psf; psf=nextpsf) {
1727 nextpsf = psf->sf_next;
1728 kfree(psf);
1729 }
1730 pmc->tomb = NULL;
1731 for (psf=pmc->sources; psf; psf=nextpsf) {
1732 nextpsf = psf->sf_next;
1733 kfree(psf);
1734 }
1735 pmc->sources = NULL;
1736 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1737 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1738 pmc->sfcount[MCAST_EXCLUDE] = 1;
1739}
1740
1741
1742/*
1743 * Join a multicast group
1744 */
1745int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1746{
1747 int err;
8f935bbd 1748 __be32 addr = imr->imr_multiaddr.s_addr;
ca9b907d 1749 struct ip_mc_socklist *iml=NULL, *i;
1da177e4
LT		 1750 struct in_device *in_dev;
1751 struct inet_sock *inet = inet_sk(sk);
ca9b907d 1752 int ifindex;
1da177e4
LT		 1753 int count = 0;
1754
1755 if (!MULTICAST(addr))
1756 return -EINVAL;
1757
6756ae4b 1758 rtnl_lock();
1da177e4
LT		 1759
1760 in_dev = ip_mc_find_dev(imr);
1761
1762 if (!in_dev) {
1763 iml = NULL;
1764 err = -ENODEV;
1765 goto done;
1766 }
1767
1da177e4 1768 err = -EADDRINUSE;
ca9b907d 1769 ifindex = imr->imr_ifindex;
1da177e4 1770 for (i = inet->mc_list; i; i = i->next) {
ca9b907d
DS		 1771 if (i->multi.imr_multiaddr.s_addr == addr &&
1772 i->multi.imr_ifindex == ifindex)
1da177e4 1773 goto done;
1da177e4
LT		 1774 count++;
1775 }
1776 err = -ENOBUFS;
ca9b907d
DS		 1777 if (count >= sysctl_igmp_max_memberships)
1778 goto done;
8b3a7005 1779 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
ca9b907d 1780 if (iml == NULL)
1da177e4 1781 goto done;
ca9b907d 1782
1da177e4
LT		 1783 memcpy(&iml->multi, imr, sizeof(*imr));
1784 iml->next = inet->mc_list;
1da177e4
LT		 1785 iml->sflist = NULL;
1786 iml->sfmode = MCAST_EXCLUDE;
1787 inet->mc_list = iml;
1788 ip_mc_inc_group(in_dev, addr);
1da177e4 1789 err = 0;
1da177e4 1790done:
6756ae4b 1791 rtnl_unlock();
1da177e4
LT		 1792 return err;
1793}
1794
1795static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1796 struct in_device *in_dev)
1797{
1798 int err;
1799
1800 if (iml->sflist == 0) {
1801 /* any-source empty exclude case */
1802 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1803 iml->sfmode, 0, NULL, 0);
1804 }
1805 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1806 iml->sfmode, iml->sflist->sl_count,
1807 iml->sflist->sl_addr, 0);
1808 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1809 iml->sflist = NULL;
1810 return err;
1811}
1812
1813/*
1814 * Ask a socket to leave a group.
1815 */
1816
1817int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1818{
1819 struct inet_sock *inet = inet_sk(sk);
1820 struct ip_mc_socklist *iml, **imlp;
84b42bae 1821 struct in_device *in_dev;
8f935bbd 1822 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1823 u32 ifindex;
acd6e00b 1824 int ret = -EADDRNOTAVAIL;
1da177e4
LT		 1825
1826 rtnl_lock();
84b42bae 1827 in_dev = ip_mc_find_dev(imr);
84b42bae 1828 ifindex = imr->imr_ifindex;
1da177e4 1829 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
acd6e00b
DS		 1830 if (iml->multi.imr_multiaddr.s_addr != group)
1831 continue;
1832 if (ifindex) {
1833 if (iml->multi.imr_ifindex != ifindex)
1834 continue;
1835 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1836 iml->multi.imr_address.s_addr)
1837 continue;
1da177e4 1838
acd6e00b 1839 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4 1840
acd6e00b
DS		 1841 *imlp = iml->next;
1842
1843 if (in_dev)
84b42bae 1844 ip_mc_dec_group(in_dev, group);
acd6e00b
DS		 1845 rtnl_unlock();
1846 sock_kfree_s(sk, iml, sizeof(*iml));
1847 return 0;
1da177e4 1848 }
acd6e00b
DS		 1849 if (!in_dev)
1850 ret = -ENODEV;
1da177e4 1851 rtnl_unlock();
acd6e00b 1852 return ret;
1da177e4
LT		 1853}
1854
1855int ip_mc_source(int add, int omode, struct sock *sk, struct
1856 ip_mreq_source *mreqs, int ifindex)
1857{
1858 int err;
1859 struct ip_mreqn imr;
63007727 1860 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 1861 struct ip_mc_socklist *pmc;
1862 struct in_device *in_dev = NULL;
1863 struct inet_sock *inet = inet_sk(sk);
1864 struct ip_sf_socklist *psl;
8cdaaa15 1865 int leavegroup = 0;
1da177e4
LT		 1866 int i, j, rv;
1867
1868 if (!MULTICAST(addr))
1869 return -EINVAL;
1870
6756ae4b 1871 rtnl_lock();
1da177e4
LT		 1872
1873 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1874 imr.imr_address.s_addr = mreqs->imr_interface;
1875 imr.imr_ifindex = ifindex;
1876 in_dev = ip_mc_find_dev(&imr);
1877
1878 if (!in_dev) {
1879 err = -ENODEV;
1880 goto done;
1881 }
1882 err = -EADDRNOTAVAIL;
1883
1884 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
ca9b907d
DS		 1885 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1886 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1da177e4
LT		 1887 break;
1888 }
917f2f10
DS		 1889 if (!pmc) { /* must have a prior join */
1890 err = -EINVAL;
1da177e4 1891 goto done;
917f2f10 1892 }
1da177e4
LT		 1893 /* if a source filter was set, must be the same mode as before */
1894 if (pmc->sflist) {
917f2f10
DS		 1895 if (pmc->sfmode != omode) {
1896 err = -EINVAL;
1da177e4 1897 goto done;
917f2f10 1898 }
1da177e4
LT		 1899 } else if (pmc->sfmode != omode) {
1900 /* allow mode switches for empty-set filters */
1901 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 1902 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 1903 NULL, 0);
1904 pmc->sfmode = omode;
1905 }
1906
1907 psl = pmc->sflist;
1908 if (!add) {
1909 if (!psl)
917f2f10 1910 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1911 rv = !0;
1912 for (i=0; i<psl->sl_count; i++) {
1913 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1914 sizeof(__be32));
1da177e4
LT		 1915 if (rv == 0)
1916 break;
1917 }
1918 if (rv) /* source not found */
917f2f10 1919 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1920
8cdaaa15
DS		 1921 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1922 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1923 leavegroup = 1;
1924 goto done;
1925 }
1926
1da177e4 1927 /* update the interface filter */
e905a9ed 1928 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1929 &mreqs->imr_sourceaddr, 1);
1930
1931 for (j=i+1; j<psl->sl_count; j++)
1932 psl->sl_addr[j-1] = psl->sl_addr[j];
1933 psl->sl_count--;
1934 err = 0;
1935 goto done;
1936 }
1937 /* else, add a new source to the filter */
1938
1939 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1940 err = -ENOBUFS;
1941 goto done;
1942 }
1943 if (!psl || psl->sl_count == psl->sl_max) {
1944 struct ip_sf_socklist *newpsl;
1945 int count = IP_SFBLOCK;
1946
1947 if (psl)
1948 count += psl->sl_max;
8b3a7005 1949 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 1950 if (!newpsl) {
1951 err = -ENOBUFS;
1952 goto done;
1953 }
1954 newpsl->sl_max = count;
1955 newpsl->sl_count = count - IP_SFBLOCK;
1956 if (psl) {
1957 for (i=0; i<psl->sl_count; i++)
1958 newpsl->sl_addr[i] = psl->sl_addr[i];
1959 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1960 }
1961 pmc->sflist = psl = newpsl;
1962 }
1963 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1964 for (i=0; i<psl->sl_count; i++) {
1965 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1966 sizeof(__be32));
1da177e4
LT		 1967 if (rv == 0)
1968 break;
1969 }
1970 if (rv == 0) /* address already there is an error */
1971 goto done;
1972 for (j=psl->sl_count-1; j>=i; j--)
1973 psl->sl_addr[j+1] = psl->sl_addr[j];
1974 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1975 psl->sl_count++;
1976 err = 0;
1977 /* update the interface list */
e905a9ed 1978 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1979 &mreqs->imr_sourceaddr, 1);
1980done:
6756ae4b 1981 rtnl_unlock();
8cdaaa15
DS		 1982 if (leavegroup)
1983 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 1984 return err;
1985}
1986
1987int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1988{
9951f036 1989 int err = 0;
1da177e4 1990 struct ip_mreqn imr;
63007727 1991 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 1992 struct ip_mc_socklist *pmc;
1993 struct in_device *in_dev;
1994 struct inet_sock *inet = inet_sk(sk);
1995 struct ip_sf_socklist *newpsl, *psl;
9951f036 1996 int leavegroup = 0;
1da177e4
LT		 1997
1998 if (!MULTICAST(addr))
1999 return -EINVAL;
2000 if (msf->imsf_fmode != MCAST_INCLUDE &&
2001 msf->imsf_fmode != MCAST_EXCLUDE)
2002 return -EINVAL;
2003
6756ae4b 2004 rtnl_lock();
1da177e4
LT		 2005
2006 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2007 imr.imr_address.s_addr = msf->imsf_interface;
2008 imr.imr_ifindex = ifindex;
2009 in_dev = ip_mc_find_dev(&imr);
2010
2011 if (!in_dev) {
2012 err = -ENODEV;
2013 goto done;
2014 }
1da177e4 2015
9951f036
DS		 2016 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2017 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2018 leavegroup = 1;
2019 goto done;
2020 }
2021
1da177e4
LT		 2022 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2023 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2024 pmc->multi.imr_ifindex == imr.imr_ifindex)
2025 break;
2026 }
917f2f10
DS		 2027 if (!pmc) { /* must have a prior join */
2028 err = -EINVAL;
1da177e4 2029 goto done;
917f2f10 2030 }
1da177e4 2031 if (msf->imsf_numsrc) {
8b3a7005
KK		 2032 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2033 GFP_KERNEL);
1da177e4
LT		 2034 if (!newpsl) {
2035 err = -ENOBUFS;
2036 goto done;
2037 }
2038 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2039 memcpy(newpsl->sl_addr, msf->imsf_slist,
2040 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2041 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2042 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2043 if (err) {
2044 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2045 goto done;
2046 }
8713dbf0 2047 } else {
1da177e4 2048 newpsl = NULL;
8713dbf0
YZ		 2049 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2050 msf->imsf_fmode, 0, NULL, 0);
2051 }
1da177e4
LT		 2052 psl = pmc->sflist;
2053 if (psl) {
2054 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2055 psl->sl_count, psl->sl_addr, 0);
2056 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2057 } else
2058 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2059 0, NULL, 0);
2060 pmc->sflist = newpsl;
2061 pmc->sfmode = msf->imsf_fmode;
917f2f10 2062 err = 0;
1da177e4 2063done:
6756ae4b 2064 rtnl_unlock();
9951f036
DS		 2065 if (leavegroup)
2066 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2067 return err;
2068}
2069
2070int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2071 struct ip_msfilter __user *optval, int __user *optlen)
2072{
2073 int err, len, count, copycount;
2074 struct ip_mreqn imr;
63007727 2075 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2076 struct ip_mc_socklist *pmc;
2077 struct in_device *in_dev;
2078 struct inet_sock *inet = inet_sk(sk);
2079 struct ip_sf_socklist *psl;
2080
2081 if (!MULTICAST(addr))
2082 return -EINVAL;
2083
6756ae4b 2084 rtnl_lock();
1da177e4
LT		 2085
2086 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2087 imr.imr_address.s_addr = msf->imsf_interface;
2088 imr.imr_ifindex = 0;
2089 in_dev = ip_mc_find_dev(&imr);
2090
2091 if (!in_dev) {
2092 err = -ENODEV;
2093 goto done;
2094 }
2095 err = -EADDRNOTAVAIL;
2096
2097 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2098 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2099 pmc->multi.imr_ifindex == imr.imr_ifindex)
2100 break;
2101 }
2102 if (!pmc) /* must have a prior join */
2103 goto done;
2104 msf->imsf_fmode = pmc->sfmode;
2105 psl = pmc->sflist;
6756ae4b 2106 rtnl_unlock();
1da177e4
LT		 2107 if (!psl) {
2108 len = 0;
2109 count = 0;
2110 } else {
2111 count = psl->sl_count;
2112 }
2113 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2114 len = copycount * sizeof(psl->sl_addr[0]);
2115 msf->imsf_numsrc = count;
2116 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2117 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2118 return -EFAULT;
2119 }
2120 if (len &&
2121 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2122 return -EFAULT;
2123 return 0;
2124done:
6756ae4b 2125 rtnl_unlock();
1da177e4
LT		 2126 return err;
2127}
2128
2129int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2130 struct group_filter __user *optval, int __user *optlen)
2131{
2132 int err, i, count, copycount;
2133 struct sockaddr_in *psin;
63007727 2134 __be32 addr;
1da177e4
LT		 2135 struct ip_mc_socklist *pmc;
2136 struct inet_sock *inet = inet_sk(sk);
2137 struct ip_sf_socklist *psl;
2138
2139 psin = (struct sockaddr_in *)&gsf->gf_group;
2140 if (psin->sin_family != AF_INET)
2141 return -EINVAL;
2142 addr = psin->sin_addr.s_addr;
2143 if (!MULTICAST(addr))
2144 return -EINVAL;
2145
6756ae4b 2146 rtnl_lock();
1da177e4
LT		 2147
2148 err = -EADDRNOTAVAIL;
2149
2150 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2151 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2152 pmc->multi.imr_ifindex == gsf->gf_interface)
2153 break;
2154 }
2155 if (!pmc) /* must have a prior join */
2156 goto done;
2157 gsf->gf_fmode = pmc->sfmode;
2158 psl = pmc->sflist;
6756ae4b 2159 rtnl_unlock();
1da177e4
LT		 2160 count = psl ? psl->sl_count : 0;
2161 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2162 gsf->gf_numsrc = count;
2163 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2164 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2165 return -EFAULT;
2166 }
2167 for (i=0; i<copycount; i++) {
2168 struct sockaddr_in *psin;
2169 struct sockaddr_storage ss;
2170
2171 psin = (struct sockaddr_in *)&ss;
2172 memset(&ss, 0, sizeof(ss));
2173 psin->sin_family = AF_INET;
2174 psin->sin_addr.s_addr = psl->sl_addr[i];
2175 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2176 return -EFAULT;
2177 }
2178 return 0;
2179done:
6756ae4b 2180 rtnl_unlock();
1da177e4
LT		 2181 return err;
2182}
2183
2184/*
2185 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2186 */
c0cda068 2187int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2188{
2189 struct inet_sock *inet = inet_sk(sk);
2190 struct ip_mc_socklist *pmc;
2191 struct ip_sf_socklist *psl;
2192 int i;
2193
2194 if (!MULTICAST(loc_addr))
2195 return 1;
2196
2197 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2198 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2199 pmc->multi.imr_ifindex == dif)
2200 break;
2201 }
2202 if (!pmc)
2203 return 1;
2204 psl = pmc->sflist;
2205 if (!psl)
2206 return pmc->sfmode == MCAST_EXCLUDE;
2207
2208 for (i=0; i<psl->sl_count; i++) {
2209 if (psl->sl_addr[i] == rmt_addr)
2210 break;
2211 }
2212 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2213 return 0;
2214 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2215 return 0;
2216 return 1;
2217}
2218
2219/*
2220 * A socket is closing.
2221 */
2222
2223void ip_mc_drop_socket(struct sock *sk)
2224{
2225 struct inet_sock *inet = inet_sk(sk);
2226 struct ip_mc_socklist *iml;
2227
2228 if (inet->mc_list == NULL)
2229 return;
2230
2231 rtnl_lock();
2232 while ((iml = inet->mc_list) != NULL) {
2233 struct in_device *in_dev;
2234 inet->mc_list = iml->next;
2235
bb699cbc
MR		 2236 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
2237 (void) ip_mc_leave_src(sk, iml, in_dev);
2238 if (in_dev != NULL) {
1da177e4
LT		 2239 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2240 in_dev_put(in_dev);
2241 }
2242 sock_kfree_s(sk, iml, sizeof(*iml));
1da177e4
LT		 2243 }
2244 rtnl_unlock();
2245}
2246
a60c4923 2247int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2248{
2249 struct ip_mc_list *im;
2250 struct ip_sf_list *psf;
2251 int rv = 0;
2252
2253 read_lock(&in_dev->mc_list_lock);
2254 for (im=in_dev->mc_list; im; im=im->next) {
2255 if (im->multiaddr == mc_addr)
2256 break;
2257 }
2258 if (im && proto == IPPROTO_IGMP) {
2259 rv = 1;
2260 } else if (im) {
2261 if (src_addr) {
2262 for (psf=im->sources; psf; psf=psf->sf_next) {
2263 if (psf->sf_inaddr == src_addr)
2264 break;
2265 }
2266 if (psf)
2267 rv = psf->sf_count[MCAST_INCLUDE] ||
2268 psf->sf_count[MCAST_EXCLUDE] !=
2269 im->sfcount[MCAST_EXCLUDE];
2270 else
2271 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2272 } else
2273 rv = 1; /* unspecified source; tentatively allow */
2274 }
2275 read_unlock(&in_dev->mc_list_lock);
2276 return rv;
2277}
2278
2279#if defined(CONFIG_PROC_FS)
2280struct igmp_mc_iter_state {
2281 struct net_device *dev;
2282 struct in_device *in_dev;
2283};
2284
2285#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2286
2287static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2288{
2289 struct ip_mc_list *im = NULL;
2290 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2291
2292 for (state->dev = dev_base, state->in_dev = NULL;
e905a9ed 2293 state->dev;
1da177e4
LT		 2294 state->dev = state->dev->next) {
2295 struct in_device *in_dev;
2296 in_dev = in_dev_get(state->dev);
2297 if (!in_dev)
2298 continue;
2299 read_lock(&in_dev->mc_list_lock);
2300 im = in_dev->mc_list;
2301 if (im) {
2302 state->in_dev = in_dev;
2303 break;
2304 }
2305 read_unlock(&in_dev->mc_list_lock);
2306 in_dev_put(in_dev);
2307 }
2308 return im;
2309}
2310
2311static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2312{
2313 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2314 im = im->next;
2315 while (!im) {
2316 if (likely(state->in_dev != NULL)) {
2317 read_unlock(&state->in_dev->mc_list_lock);
2318 in_dev_put(state->in_dev);
2319 }
2320 state->dev = state->dev->next;
2321 if (!state->dev) {
2322 state->in_dev = NULL;
2323 break;
2324 }
2325 state->in_dev = in_dev_get(state->dev);
2326 if (!state->in_dev)
2327 continue;
2328 read_lock(&state->in_dev->mc_list_lock);
2329 im = state->in_dev->mc_list;
2330 }
2331 return im;
2332}
2333
2334static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2335{
2336 struct ip_mc_list *im = igmp_mc_get_first(seq);
2337 if (im)
2338 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2339 --pos;
2340 return pos ? NULL : im;
2341}
2342
2343static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2344{
2345 read_lock(&dev_base_lock);
2346 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2347}
2348
2349static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2350{
2351 struct ip_mc_list *im;
2352 if (v == SEQ_START_TOKEN)
2353 im = igmp_mc_get_first(seq);
2354 else
2355 im = igmp_mc_get_next(seq, v);
2356 ++*pos;
2357 return im;
2358}
2359
2360static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2361{
2362 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2363 if (likely(state->in_dev != NULL)) {
2364 read_unlock(&state->in_dev->mc_list_lock);
2365 in_dev_put(state->in_dev);
2366 state->in_dev = NULL;
2367 }
2368 state->dev = NULL;
2369 read_unlock(&dev_base_lock);
2370}
2371
2372static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2373{
2374 if (v == SEQ_START_TOKEN)
e905a9ed 2375 seq_puts(seq,
1da177e4
LT		 2376 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2377 else {
2378 struct ip_mc_list *im = (struct ip_mc_list *)v;
2379 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2380 char *querier;
2381#ifdef CONFIG_IP_MULTICAST
2382 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2383 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2384 "V3";
2385#else
2386 querier = "NONE";
2387#endif
2388
2389 if (state->in_dev->mc_list == im) {
2390 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2391 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2392 }
2393
2394 seq_printf(seq,
338fcf98 2395 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4
LT		 2396 im->multiaddr, im->users,
2397 im->tm_running, im->tm_running ?
2398 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2399 im->reporter);
2400 }
2401 return 0;
2402}
2403
2404static struct seq_operations igmp_mc_seq_ops = {
2405 .start = igmp_mc_seq_start,
2406 .next = igmp_mc_seq_next,
2407 .stop = igmp_mc_seq_stop,
2408 .show = igmp_mc_seq_show,
2409};
2410
2411static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2412{
2413 struct seq_file *seq;
2414 int rc = -ENOMEM;
0da974f4 2415 struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2416
2417 if (!s)
2418 goto out;
2419 rc = seq_open(file, &igmp_mc_seq_ops);
2420 if (rc)
2421 goto out_kfree;
2422
2423 seq = file->private_data;
2424 seq->private = s;
1da177e4
LT		 2425out:
2426 return rc;
2427out_kfree:
2428 kfree(s);
2429 goto out;
2430}
2431
9a32144e 2432static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2433 .owner = THIS_MODULE,
2434 .open = igmp_mc_seq_open,
2435 .read = seq_read,
2436 .llseek = seq_lseek,
2437 .release = seq_release_private,
2438};
2439
2440struct igmp_mcf_iter_state {
2441 struct net_device *dev;
2442 struct in_device *idev;
2443 struct ip_mc_list *im;
2444};
2445
2446#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2447
2448static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2449{
2450 struct ip_sf_list *psf = NULL;
2451 struct ip_mc_list *im = NULL;
2452 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2453
2454 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
e905a9ed 2455 state->dev;
1da177e4
LT		 2456 state->dev = state->dev->next) {
2457 struct in_device *idev;
2458 idev = in_dev_get(state->dev);
2459 if (unlikely(idev == NULL))
2460 continue;
2461 read_lock(&idev->mc_list_lock);
2462 im = idev->mc_list;
2463 if (likely(im != NULL)) {
2464 spin_lock_bh(&im->lock);
2465 psf = im->sources;
2466 if (likely(psf != NULL)) {
2467 state->im = im;
2468 state->idev = idev;
2469 break;
2470 }
2471 spin_unlock_bh(&im->lock);
2472 }
2473 read_unlock(&idev->mc_list_lock);
2474 in_dev_put(idev);
2475 }
2476 return psf;
2477}
2478
2479static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2480{
2481 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2482
2483 psf = psf->sf_next;
2484 while (!psf) {
2485 spin_unlock_bh(&state->im->lock);
2486 state->im = state->im->next;
2487 while (!state->im) {
2488 if (likely(state->idev != NULL)) {
2489 read_unlock(&state->idev->mc_list_lock);
2490 in_dev_put(state->idev);
2491 }
2492 state->dev = state->dev->next;
2493 if (!state->dev) {
2494 state->idev = NULL;
2495 goto out;
2496 }
2497 state->idev = in_dev_get(state->dev);
2498 if (!state->idev)
2499 continue;
2500 read_lock(&state->idev->mc_list_lock);
2501 state->im = state->idev->mc_list;
2502 }
2503 if (!state->im)
2504 break;
2505 spin_lock_bh(&state->im->lock);
2506 psf = state->im->sources;
2507 }
2508out:
2509 return psf;
2510}
2511
2512static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2513{
2514 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2515 if (psf)
2516 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2517 --pos;
2518 return pos ? NULL : psf;
2519}
2520
2521static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2522{
2523 read_lock(&dev_base_lock);
2524 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2525}
2526
2527static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2528{
2529 struct ip_sf_list *psf;
2530 if (v == SEQ_START_TOKEN)
2531 psf = igmp_mcf_get_first(seq);
2532 else
2533 psf = igmp_mcf_get_next(seq, v);
2534 ++*pos;
2535 return psf;
2536}
2537
2538static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2539{
2540 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2541 if (likely(state->im != NULL)) {
2542 spin_unlock_bh(&state->im->lock);
2543 state->im = NULL;
2544 }
2545 if (likely(state->idev != NULL)) {
2546 read_unlock(&state->idev->mc_list_lock);
2547 in_dev_put(state->idev);
2548 state->idev = NULL;
2549 }
2550 state->dev = NULL;
2551 read_unlock(&dev_base_lock);
2552}
2553
2554static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2555{
2556 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2557 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2558
2559 if (v == SEQ_START_TOKEN) {
e905a9ed 2560 seq_printf(seq,
1da177e4
LT		 2561 "%3s %6s "
2562 "%10s %10s %6s %6s\n", "Idx",
2563 "Device", "MCA",
2564 "SRC", "INC", "EXC");
2565 } else {
2566 seq_printf(seq,
2567 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2568 "0x%08x %6lu %6lu\n",
2569 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2570 ntohl(state->im->multiaddr),
2571 ntohl(psf->sf_inaddr),
2572 psf->sf_count[MCAST_INCLUDE],
2573 psf->sf_count[MCAST_EXCLUDE]);
2574 }
2575 return 0;
2576}
2577
2578static struct seq_operations igmp_mcf_seq_ops = {
2579 .start = igmp_mcf_seq_start,
2580 .next = igmp_mcf_seq_next,
2581 .stop = igmp_mcf_seq_stop,
2582 .show = igmp_mcf_seq_show,
2583};
2584
2585static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2586{
2587 struct seq_file *seq;
2588 int rc = -ENOMEM;
0da974f4 2589 struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2590
2591 if (!s)
2592 goto out;
2593 rc = seq_open(file, &igmp_mcf_seq_ops);
2594 if (rc)
2595 goto out_kfree;
2596
2597 seq = file->private_data;
2598 seq->private = s;
1da177e4
LT		 2599out:
2600 return rc;
2601out_kfree:
2602 kfree(s);
2603 goto out;
2604}
2605
9a32144e 2606static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2607 .owner = THIS_MODULE,
2608 .open = igmp_mcf_seq_open,
2609 .read = seq_read,
2610 .llseek = seq_lseek,
2611 .release = seq_release_private,
2612};
2613
2614int __init igmp_mc_proc_init(void)
2615{
2616 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2617 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2618 return 0;
2619}
2620#endif
2621
2622EXPORT_SYMBOL(ip_mc_dec_group);
2623EXPORT_SYMBOL(ip_mc_inc_group);
2624EXPORT_SYMBOL(ip_mc_join_group);
a816c7c7 2625EXPORT_SYMBOL(ip_mc_rejoin_group);
kernel source for telekom puls (alcatel/mediatek)