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[net-next-2.6.git] / net / ipv4 / igmp.c
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1da177e4
LT		 1/*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
11 * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
12 *
13 * Authors:
14 * Alan Cox <Alan.Cox@linux.org>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 *
21 * Fixes:
22 *
23 * Alan Cox : Added lots of __inline__ to optimise
24 * the memory usage of all the tiny little
25 * functions.
26 * Alan Cox : Dumped the header building experiment.
27 * Alan Cox : Minor tweaks ready for multicast routing
28 * and extended IGMP protocol.
29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
30 * writes utterly bogus code otherwise (sigh)
31 * fixed IGMP loopback to behave in the manner
32 * desired by mrouted, fixed the fact it has been
33 * broken since 1.3.6 and cleaned up a few minor
34 * points.
35 *
36 * Chih-Jen Chang : Tried to revise IGMP to Version 2
37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
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 93
457c4cbc 94#include <net/net_namespace.h>
14c85021 95#include <net/arp.h>
1da177e4
LT		 96#include <net/ip.h>
97#include <net/protocol.h>
98#include <net/route.h>
99#include <net/sock.h>
100#include <net/checksum.h>
101#include <linux/netfilter_ipv4.h>
102#ifdef CONFIG_IP_MROUTE
103#include <linux/mroute.h>
104#endif
105#ifdef CONFIG_PROC_FS
106#include <linux/proc_fs.h>
107#include <linux/seq_file.h>
108#endif
109
110#define IP_MAX_MEMBERSHIPS 20
111#define IP_MAX_MSF 10
112
113#ifdef CONFIG_IP_MULTICAST
114/* Parameter names and values are taken from igmp-v2-06 draft */
115
116#define IGMP_V1_Router_Present_Timeout (400*HZ)
117#define IGMP_V2_Router_Present_Timeout (400*HZ)
118#define IGMP_Unsolicited_Report_Interval (10*HZ)
119#define IGMP_Query_Response_Interval (10*HZ)
120#define IGMP_Unsolicited_Report_Count 2
121
122
123#define IGMP_Initial_Report_Delay (1)
124
125/* IGMP_Initial_Report_Delay is not from IGMP specs!
126 * IGMP specs require to report membership immediately after
127 * joining a group, but we delay the first report by a
128 * small interval. It seems more natural and still does not
129 * contradict to specs provided this delay is small enough.
130 */
131
42f811b8 132#define IGMP_V1_SEEN(in_dev) \
586f1211 133 (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, FORCE_IGMP_VERSION) == 1 || \
42f811b8
HX		 134 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
135 ((in_dev)->mr_v1_seen && \
136 time_before(jiffies, (in_dev)->mr_v1_seen)))
137#define IGMP_V2_SEEN(in_dev) \
586f1211 138 (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, FORCE_IGMP_VERSION) == 2 || \
42f811b8
HX		 139 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
140 ((in_dev)->mr_v2_seen && \
141 time_before(jiffies, (in_dev)->mr_v2_seen)))
1da177e4
LT		 142
143static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
63007727 144static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
1da177e4
LT		 145static void igmpv3_clear_delrec(struct in_device *in_dev);
146static int sf_setstate(struct ip_mc_list *pmc);
147static void sf_markstate(struct ip_mc_list *pmc);
148#endif
149static void ip_mc_clear_src(struct ip_mc_list *pmc);
8f935bbd
AV		 150static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
151 int sfcount, __be32 *psfsrc, int delta);
1da177e4
LT		 152
153static void ip_ma_put(struct ip_mc_list *im)
154{
155 if (atomic_dec_and_test(&im->refcnt)) {
156 in_dev_put(im->interface);
157 kfree(im);
158 }
159}
160
161#ifdef CONFIG_IP_MULTICAST
162
163/*
164 * Timer management
165 */
166
167static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
168{
169 spin_lock_bh(&im->lock);
170 if (del_timer(&im->timer))
171 atomic_dec(&im->refcnt);
172 im->tm_running=0;
173 im->reporter = 0;
174 im->unsolicit_count = 0;
175 spin_unlock_bh(&im->lock);
176}
177
178/* It must be called with locked im->lock */
179static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
180{
181 int tv=net_random() % max_delay;
182
183 im->tm_running=1;
184 if (!mod_timer(&im->timer, jiffies+tv+2))
185 atomic_inc(&im->refcnt);
186}
187
188static void igmp_gq_start_timer(struct in_device *in_dev)
189{
190 int tv = net_random() % in_dev->mr_maxdelay;
191
192 in_dev->mr_gq_running = 1;
193 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
194 in_dev_hold(in_dev);
195}
196
197static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
198{
199 int tv = net_random() % delay;
200
201 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
202 in_dev_hold(in_dev);
203}
204
205static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
206{
207 spin_lock_bh(&im->lock);
208 im->unsolicit_count = 0;
209 if (del_timer(&im->timer)) {
210 if ((long)(im->timer.expires-jiffies) < max_delay) {
211 add_timer(&im->timer);
212 im->tm_running=1;
213 spin_unlock_bh(&im->lock);
214 return;
215 }
216 atomic_dec(&im->refcnt);
217 }
218 igmp_start_timer(im, max_delay);
219 spin_unlock_bh(&im->lock);
220}
221
222
223/*
224 * Send an IGMP report.
225 */
226
227#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
228
229
230static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
231 int gdeleted, int sdeleted)
232{
233 switch (type) {
234 case IGMPV3_MODE_IS_INCLUDE:
235 case IGMPV3_MODE_IS_EXCLUDE:
236 if (gdeleted || sdeleted)
237 return 0;
ad12583f
DS		 238 if (!(pmc->gsquery && !psf->sf_gsresp)) {
239 if (pmc->sfmode == MCAST_INCLUDE)
240 return 1;
241 /* don't include if this source is excluded
242 * in all filters
243 */
244 if (psf->sf_count[MCAST_INCLUDE])
245 return type == IGMPV3_MODE_IS_INCLUDE;
246 return pmc->sfcount[MCAST_EXCLUDE] ==
247 psf->sf_count[MCAST_EXCLUDE];
248 }
249 return 0;
1da177e4
LT		 250 case IGMPV3_CHANGE_TO_INCLUDE:
251 if (gdeleted || sdeleted)
252 return 0;
253 return psf->sf_count[MCAST_INCLUDE] != 0;
254 case IGMPV3_CHANGE_TO_EXCLUDE:
255 if (gdeleted || sdeleted)
256 return 0;
257 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
258 psf->sf_count[MCAST_INCLUDE])
259 return 0;
260 return pmc->sfcount[MCAST_EXCLUDE] ==
261 psf->sf_count[MCAST_EXCLUDE];
262 case IGMPV3_ALLOW_NEW_SOURCES:
263 if (gdeleted || !psf->sf_crcount)
264 return 0;
265 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
266 case IGMPV3_BLOCK_OLD_SOURCES:
267 if (pmc->sfmode == MCAST_INCLUDE)
268 return gdeleted || (psf->sf_crcount && sdeleted);
269 return psf->sf_crcount && !gdeleted && !sdeleted;
270 }
271 return 0;
272}
273
274static int
275igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
276{
277 struct ip_sf_list *psf;
278 int scount = 0;
279
280 for (psf=pmc->sources; psf; psf=psf->sf_next) {
281 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
282 continue;
283 scount++;
284 }
285 return scount;
286}
287
288static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
289{
290 struct sk_buff *skb;
291 struct rtable *rt;
292 struct iphdr *pip;
293 struct igmpv3_report *pig;
294
295 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
296 if (skb == NULL)
297 return NULL;
298
299 {
300 struct flowi fl = { .oif = dev->ifindex,
301 .nl_u = { .ip4_u = {
302 .daddr = IGMPV3_ALL_MCR } },
303 .proto = IPPROTO_IGMP };
f206351a 304 if (ip_route_output_key(&init_net, &rt, &fl)) {
1da177e4
LT		 305 kfree_skb(skb);
306 return NULL;
307 }
308 }
309 if (rt->rt_src == 0) {
310 kfree_skb(skb);
311 ip_rt_put(rt);
312 return NULL;
313 }
314
315 skb->dst = &rt->u.dst;
316 skb->dev = dev;
317
318 skb_reserve(skb, LL_RESERVED_SPACE(dev));
319
7e28ecc2 320 skb_reset_network_header(skb);
eddc9ec5 321 pip = ip_hdr(skb);
7e28ecc2 322 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 323
324 pip->version = 4;
325 pip->ihl = (sizeof(struct iphdr)+4)>>2;
326 pip->tos = 0xc0;
327 pip->frag_off = htons(IP_DF);
328 pip->ttl = 1;
329 pip->daddr = rt->rt_dst;
330 pip->saddr = rt->rt_src;
331 pip->protocol = IPPROTO_IGMP;
332 pip->tot_len = 0; /* filled in later */
333 ip_select_ident(pip, &rt->u.dst, NULL);
334 ((u8*)&pip[1])[0] = IPOPT_RA;
335 ((u8*)&pip[1])[1] = 4;
336 ((u8*)&pip[1])[2] = 0;
337 ((u8*)&pip[1])[3] = 0;
338
b0e380b1 339 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
d10ba34b 340 skb_put(skb, sizeof(*pig));
d9edf9e2 341 pig = igmpv3_report_hdr(skb);
1da177e4
LT		 342 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
343 pig->resv1 = 0;
344 pig->csum = 0;
345 pig->resv2 = 0;
346 pig->ngrec = 0;
347 return skb;
348}
349
350static int igmpv3_sendpack(struct sk_buff *skb)
351{
d9edf9e2 352 struct igmphdr *pig = igmp_hdr(skb);
27a884dc 353 const int igmplen = skb->tail - skb->transport_header;
1da177e4 354
d9edf9e2 355 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
1da177e4 356
c439cb2e 357 return ip_local_out(skb);
1da177e4
LT		 358}
359
360static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
361{
362 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
363}
364
365static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
366 int type, struct igmpv3_grec **ppgr)
367{
368 struct net_device *dev = pmc->interface->dev;
369 struct igmpv3_report *pih;
370 struct igmpv3_grec *pgr;
371
372 if (!skb)
373 skb = igmpv3_newpack(dev, dev->mtu);
374 if (!skb)
375 return NULL;
376 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
377 pgr->grec_type = type;
378 pgr->grec_auxwords = 0;
379 pgr->grec_nsrcs = 0;
380 pgr->grec_mca = pmc->multiaddr;
d9edf9e2 381 pih = igmpv3_report_hdr(skb);
1da177e4
LT		 382 pih->ngrec = htons(ntohs(pih->ngrec)+1);
383 *ppgr = pgr;
384 return skb;
385}
386
387#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
388 skb_tailroom(skb)) : 0)
389
390static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
391 int type, int gdeleted, int sdeleted)
392{
393 struct net_device *dev = pmc->interface->dev;
394 struct igmpv3_report *pih;
395 struct igmpv3_grec *pgr = NULL;
396 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
ad12583f 397 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 398
399 if (pmc->multiaddr == IGMP_ALL_HOSTS)
400 return skb;
401
402 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
403 type == IGMPV3_MODE_IS_EXCLUDE;
404 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
405 type == IGMPV3_CHANGE_TO_EXCLUDE;
406
ad12583f
DS		 407 stotal = scount = 0;
408
1da177e4
LT		 409 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
410
ad12583f
DS		 411 if (!*psf_list)
412 goto empty_source;
413
d9edf9e2 414 pih = skb ? igmpv3_report_hdr(skb) : NULL;
1da177e4
LT		 415
416 /* EX and TO_EX get a fresh packet, if needed */
417 if (truncate) {
418 if (pih && pih->ngrec &&
419 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
420 if (skb)
421 igmpv3_sendpack(skb);
422 skb = igmpv3_newpack(dev, dev->mtu);
423 }
424 }
425 first = 1;
1da177e4
LT		 426 psf_prev = NULL;
427 for (psf=*psf_list; psf; psf=psf_next) {
ea4d9e72 428 __be32 *psrc;
1da177e4
LT		 429
430 psf_next = psf->sf_next;
431
432 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
433 psf_prev = psf;
434 continue;
435 }
436
437 /* clear marks on query responses */
438 if (isquery)
439 psf->sf_gsresp = 0;
440
63007727 441 if (AVAILABLE(skb) < sizeof(__be32) +
1da177e4
LT		 442 first*sizeof(struct igmpv3_grec)) {
443 if (truncate && !first)
444 break; /* truncate these */
445 if (pgr)
446 pgr->grec_nsrcs = htons(scount);
447 if (skb)
448 igmpv3_sendpack(skb);
449 skb = igmpv3_newpack(dev, dev->mtu);
450 first = 1;
451 scount = 0;
452 }
453 if (first) {
454 skb = add_grhead(skb, pmc, type, &pgr);
455 first = 0;
456 }
cc63f70b
AD		 457 if (!skb)
458 return NULL;
63007727 459 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
1da177e4 460 *psrc = psf->sf_inaddr;
ad12583f 461 scount++; stotal++;
1da177e4
LT		 462 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
463 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
464 psf->sf_crcount--;
465 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
466 if (psf_prev)
467 psf_prev->sf_next = psf->sf_next;
468 else
469 *psf_list = psf->sf_next;
470 kfree(psf);
471 continue;
472 }
473 }
474 psf_prev = psf;
475 }
ad12583f
DS		 476
477empty_source:
478 if (!stotal) {
479 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
480 type == IGMPV3_BLOCK_OLD_SOURCES)
481 return skb;
482 if (pmc->crcount || isquery) {
483 /* make sure we have room for group header */
484 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
485 igmpv3_sendpack(skb);
486 skb = NULL; /* add_grhead will get a new one */
487 }
488 skb = add_grhead(skb, pmc, type, &pgr);
489 }
490 }
1da177e4
LT		 491 if (pgr)
492 pgr->grec_nsrcs = htons(scount);
493
494 if (isquery)
495 pmc->gsquery = 0; /* clear query state on report */
496 return skb;
497}
498
499static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
500{
501 struct sk_buff *skb = NULL;
502 int type;
503
504 if (!pmc) {
505 read_lock(&in_dev->mc_list_lock);
506 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
507 if (pmc->multiaddr == IGMP_ALL_HOSTS)
508 continue;
509 spin_lock_bh(&pmc->lock);
510 if (pmc->sfcount[MCAST_EXCLUDE])
511 type = IGMPV3_MODE_IS_EXCLUDE;
512 else
513 type = IGMPV3_MODE_IS_INCLUDE;
514 skb = add_grec(skb, pmc, type, 0, 0);
515 spin_unlock_bh(&pmc->lock);
516 }
517 read_unlock(&in_dev->mc_list_lock);
518 } else {
519 spin_lock_bh(&pmc->lock);
520 if (pmc->sfcount[MCAST_EXCLUDE])
521 type = IGMPV3_MODE_IS_EXCLUDE;
522 else
523 type = IGMPV3_MODE_IS_INCLUDE;
524 skb = add_grec(skb, pmc, type, 0, 0);
525 spin_unlock_bh(&pmc->lock);
526 }
527 if (!skb)
528 return 0;
529 return igmpv3_sendpack(skb);
530}
531
532/*
533 * remove zero-count source records from a source filter list
534 */
535static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
536{
537 struct ip_sf_list *psf_prev, *psf_next, *psf;
538
539 psf_prev = NULL;
540 for (psf=*ppsf; psf; psf = psf_next) {
541 psf_next = psf->sf_next;
542 if (psf->sf_crcount == 0) {
543 if (psf_prev)
544 psf_prev->sf_next = psf->sf_next;
545 else
546 *ppsf = psf->sf_next;
547 kfree(psf);
548 } else
549 psf_prev = psf;
550 }
551}
552
553static void igmpv3_send_cr(struct in_device *in_dev)
554{
555 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
556 struct sk_buff *skb = NULL;
557 int type, dtype;
558
559 read_lock(&in_dev->mc_list_lock);
560 spin_lock_bh(&in_dev->mc_tomb_lock);
561
562 /* deleted MCA's */
563 pmc_prev = NULL;
564 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
565 pmc_next = pmc->next;
566 if (pmc->sfmode == MCAST_INCLUDE) {
567 type = IGMPV3_BLOCK_OLD_SOURCES;
568 dtype = IGMPV3_BLOCK_OLD_SOURCES;
569 skb = add_grec(skb, pmc, type, 1, 0);
570 skb = add_grec(skb, pmc, dtype, 1, 1);
571 }
572 if (pmc->crcount) {
1da177e4
LT		 573 if (pmc->sfmode == MCAST_EXCLUDE) {
574 type = IGMPV3_CHANGE_TO_INCLUDE;
575 skb = add_grec(skb, pmc, type, 1, 0);
576 }
ad12583f 577 pmc->crcount--;
1da177e4
LT		 578 if (pmc->crcount == 0) {
579 igmpv3_clear_zeros(&pmc->tomb);
580 igmpv3_clear_zeros(&pmc->sources);
581 }
582 }
583 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
584 if (pmc_prev)
585 pmc_prev->next = pmc_next;
586 else
587 in_dev->mc_tomb = pmc_next;
588 in_dev_put(pmc->interface);
589 kfree(pmc);
590 } else
591 pmc_prev = pmc;
592 }
593 spin_unlock_bh(&in_dev->mc_tomb_lock);
594
595 /* change recs */
596 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
597 spin_lock_bh(&pmc->lock);
598 if (pmc->sfcount[MCAST_EXCLUDE]) {
599 type = IGMPV3_BLOCK_OLD_SOURCES;
600 dtype = IGMPV3_ALLOW_NEW_SOURCES;
601 } else {
602 type = IGMPV3_ALLOW_NEW_SOURCES;
603 dtype = IGMPV3_BLOCK_OLD_SOURCES;
604 }
605 skb = add_grec(skb, pmc, type, 0, 0);
606 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
607
608 /* filter mode changes */
609 if (pmc->crcount) {
1da177e4
LT		 610 if (pmc->sfmode == MCAST_EXCLUDE)
611 type = IGMPV3_CHANGE_TO_EXCLUDE;
612 else
613 type = IGMPV3_CHANGE_TO_INCLUDE;
614 skb = add_grec(skb, pmc, type, 0, 0);
ad12583f 615 pmc->crcount--;
1da177e4
LT		 616 }
617 spin_unlock_bh(&pmc->lock);
618 }
619 read_unlock(&in_dev->mc_list_lock);
620
621 if (!skb)
622 return;
623 (void) igmpv3_sendpack(skb);
624}
625
626static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
627 int type)
628{
629 struct sk_buff *skb;
630 struct iphdr *iph;
631 struct igmphdr *ih;
632 struct rtable *rt;
633 struct net_device *dev = in_dev->dev;
63007727
AV		 634 __be32 group = pmc ? pmc->multiaddr : 0;
635 __be32 dst;
1da177e4
LT		 636
637 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
638 return igmpv3_send_report(in_dev, pmc);
639 else if (type == IGMP_HOST_LEAVE_MESSAGE)
640 dst = IGMP_ALL_ROUTER;
641 else
642 dst = group;
643
644 {
645 struct flowi fl = { .oif = dev->ifindex,
646 .nl_u = { .ip4_u = { .daddr = dst } },
647 .proto = IPPROTO_IGMP };
f206351a 648 if (ip_route_output_key(&init_net, &rt, &fl))
1da177e4
LT		 649 return -1;
650 }
651 if (rt->rt_src == 0) {
652 ip_rt_put(rt);
653 return -1;
654 }
655
656 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
657 if (skb == NULL) {
658 ip_rt_put(rt);
659 return -1;
660 }
661
662 skb->dst = &rt->u.dst;
663
664 skb_reserve(skb, LL_RESERVED_SPACE(dev));
665
7e28ecc2 666 skb_reset_network_header(skb);
eddc9ec5 667 iph = ip_hdr(skb);
7e28ecc2 668 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 669
670 iph->version = 4;
671 iph->ihl = (sizeof(struct iphdr)+4)>>2;
672 iph->tos = 0xc0;
673 iph->frag_off = htons(IP_DF);
674 iph->ttl = 1;
675 iph->daddr = dst;
676 iph->saddr = rt->rt_src;
677 iph->protocol = IPPROTO_IGMP;
1da177e4
LT		 678 ip_select_ident(iph, &rt->u.dst, NULL);
679 ((u8*)&iph[1])[0] = IPOPT_RA;
680 ((u8*)&iph[1])[1] = 4;
681 ((u8*)&iph[1])[2] = 0;
682 ((u8*)&iph[1])[3] = 0;
1da177e4
LT		 683
684 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
685 ih->type=type;
686 ih->code=0;
687 ih->csum=0;
688 ih->group=group;
689 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
690
c439cb2e 691 return ip_local_out(skb);
1da177e4
LT		 692}
693
694static void igmp_gq_timer_expire(unsigned long data)
695{
696 struct in_device *in_dev = (struct in_device *)data;
697
698 in_dev->mr_gq_running = 0;
699 igmpv3_send_report(in_dev, NULL);
700 __in_dev_put(in_dev);
701}
702
703static void igmp_ifc_timer_expire(unsigned long data)
704{
705 struct in_device *in_dev = (struct in_device *)data;
706
707 igmpv3_send_cr(in_dev);
708 if (in_dev->mr_ifc_count) {
709 in_dev->mr_ifc_count--;
710 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
711 }
712 __in_dev_put(in_dev);
713}
714
715static void igmp_ifc_event(struct in_device *in_dev)
716{
717 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
718 return;
e905a9ed 719 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 720 IGMP_Unsolicited_Report_Count;
721 igmp_ifc_start_timer(in_dev, 1);
722}
723
724
725static void igmp_timer_expire(unsigned long data)
726{
727 struct ip_mc_list *im=(struct ip_mc_list *)data;
728 struct in_device *in_dev = im->interface;
729
730 spin_lock(&im->lock);
731 im->tm_running=0;
732
733 if (im->unsolicit_count) {
734 im->unsolicit_count--;
735 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
736 }
737 im->reporter = 1;
738 spin_unlock(&im->lock);
739
740 if (IGMP_V1_SEEN(in_dev))
741 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
742 else if (IGMP_V2_SEEN(in_dev))
743 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
744 else
745 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
746
747 ip_ma_put(im);
748}
749
ad12583f 750/* mark EXCLUDE-mode sources */
ea4d9e72 751static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 752{
753 struct ip_sf_list *psf;
754 int i, scount;
755
ad12583f
DS		 756 scount = 0;
757 for (psf=pmc->sources; psf; psf=psf->sf_next) {
758 if (scount == nsrcs)
759 break;
760 for (i=0; i<nsrcs; i++) {
761 /* skip inactive filters */
762 if (pmc->sfcount[MCAST_INCLUDE] ||
763 pmc->sfcount[MCAST_EXCLUDE] !=
764 psf->sf_count[MCAST_EXCLUDE])
765 continue;
766 if (srcs[i] == psf->sf_inaddr) {
767 scount++;
768 break;
769 }
770 }
771 }
772 pmc->gsquery = 0;
773 if (scount == nsrcs) /* all sources excluded */
774 return 0;
775 return 1;
776}
777
ea4d9e72 778static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 779{
780 struct ip_sf_list *psf;
781 int i, scount;
782
783 if (pmc->sfmode == MCAST_EXCLUDE)
784 return igmp_xmarksources(pmc, nsrcs, srcs);
785
786 /* mark INCLUDE-mode sources */
1da177e4
LT		 787 scount = 0;
788 for (psf=pmc->sources; psf; psf=psf->sf_next) {
789 if (scount == nsrcs)
790 break;
791 for (i=0; i<nsrcs; i++)
792 if (srcs[i] == psf->sf_inaddr) {
793 psf->sf_gsresp = 1;
794 scount++;
795 break;
796 }
797 }
ad12583f
DS		 798 if (!scount) {
799 pmc->gsquery = 0;
800 return 0;
801 }
802 pmc->gsquery = 1;
803 return 1;
1da177e4
LT		 804}
805
63007727 806static void igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 807{
808 struct ip_mc_list *im;
809
810 /* Timers are only set for non-local groups */
811
812 if (group == IGMP_ALL_HOSTS)
813 return;
814
815 read_lock(&in_dev->mc_list_lock);
816 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
817 if (im->multiaddr == group) {
818 igmp_stop_timer(im);
819 break;
820 }
821 }
822 read_unlock(&in_dev->mc_list_lock);
823}
824
825static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
826 int len)
827{
d9edf9e2
ACM		 828 struct igmphdr *ih = igmp_hdr(skb);
829 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
1da177e4 830 struct ip_mc_list *im;
63007727 831 __be32 group = ih->group;
1da177e4
LT		 832 int max_delay;
833 int mark = 0;
834
835
836 if (len == 8) {
837 if (ih->code == 0) {
838 /* Alas, old v1 router presents here. */
e905a9ed 839
1da177e4
LT		 840 max_delay = IGMP_Query_Response_Interval;
841 in_dev->mr_v1_seen = jiffies +
842 IGMP_V1_Router_Present_Timeout;
843 group = 0;
844 } else {
845 /* v2 router present */
846 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
847 in_dev->mr_v2_seen = jiffies +
848 IGMP_V2_Router_Present_Timeout;
849 }
850 /* cancel the interface change timer */
851 in_dev->mr_ifc_count = 0;
852 if (del_timer(&in_dev->mr_ifc_timer))
853 __in_dev_put(in_dev);
854 /* clear deleted report items */
855 igmpv3_clear_delrec(in_dev);
856 } else if (len < 12) {
857 return; /* ignore bogus packet; freed by caller */
858 } else { /* v3 */
859 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
860 return;
e905a9ed 861
d9edf9e2 862 ih3 = igmpv3_query_hdr(skb);
1da177e4 863 if (ih3->nsrcs) {
e905a9ed 864 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 865 + ntohs(ih3->nsrcs)*sizeof(__be32)))
1da177e4 866 return;
d9edf9e2 867 ih3 = igmpv3_query_hdr(skb);
1da177e4
LT		 868 }
869
870 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
871 if (!max_delay)
872 max_delay = 1; /* can't mod w/ 0 */
873 in_dev->mr_maxdelay = max_delay;
874 if (ih3->qrv)
875 in_dev->mr_qrv = ih3->qrv;
876 if (!group) { /* general query */
877 if (ih3->nsrcs)
878 return; /* no sources allowed */
879 igmp_gq_start_timer(in_dev);
880 return;
881 }
882 /* mark sources to include, if group & source-specific */
883 mark = ih3->nsrcs != 0;
884 }
885
886 /*
887 * - Start the timers in all of our membership records
888 * that the query applies to for the interface on
889 * which the query arrived excl. those that belong
890 * to a "local" group (224.0.0.X)
891 * - For timers already running check if they need to
892 * be reset.
893 * - Use the igmp->igmp_code field as the maximum
894 * delay possible
895 */
896 read_lock(&in_dev->mc_list_lock);
897 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
ad12583f
DS		 898 int changed;
899
1da177e4
LT		 900 if (group && group != im->multiaddr)
901 continue;
902 if (im->multiaddr == IGMP_ALL_HOSTS)
903 continue;
904 spin_lock_bh(&im->lock);
905 if (im->tm_running)
906 im->gsquery = im->gsquery && mark;
907 else
908 im->gsquery = mark;
ad12583f 909 changed = !im->gsquery ||
e905a9ed 910 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 911 spin_unlock_bh(&im->lock);
ad12583f
DS		 912 if (changed)
913 igmp_mod_timer(im, max_delay);
1da177e4
LT		 914 }
915 read_unlock(&in_dev->mc_list_lock);
916}
917
918int igmp_rcv(struct sk_buff *skb)
919{
920 /* This basically follows the spec line by line -- see RFC1112 */
921 struct igmphdr *ih;
922 struct in_device *in_dev = in_dev_get(skb->dev);
923 int len = skb->len;
924
925 if (in_dev==NULL) {
926 kfree_skb(skb);
927 return 0;
928 }
929
fb286bb2
HX		 930 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
931 goto drop;
932
933 switch (skb->ip_summed) {
84fa7933 934 case CHECKSUM_COMPLETE:
d3bc23e7 935 if (!csum_fold(skb->csum))
fb286bb2
HX		 936 break;
937 /* fall through */
938 case CHECKSUM_NONE:
939 skb->csum = 0;
940 if (__skb_checksum_complete(skb))
941 goto drop;
1da177e4
LT		 942 }
943
d9edf9e2 944 ih = igmp_hdr(skb);
1da177e4
LT		 945 switch (ih->type) {
946 case IGMP_HOST_MEMBERSHIP_QUERY:
947 igmp_heard_query(in_dev, skb, len);
948 break;
949 case IGMP_HOST_MEMBERSHIP_REPORT:
950 case IGMPV2_HOST_MEMBERSHIP_REPORT:
951 case IGMPV3_HOST_MEMBERSHIP_REPORT:
952 /* Is it our report looped back? */
953 if (((struct rtable*)skb->dst)->fl.iif == 0)
954 break;
24c69275
DS		 955 /* don't rely on MC router hearing unicast reports */
956 if (skb->pkt_type == PACKET_MULTICAST ||
957 skb->pkt_type == PACKET_BROADCAST)
958 igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 959 break;
960 case IGMP_PIM:
961#ifdef CONFIG_IP_PIMSM_V1
962 in_dev_put(in_dev);
963 return pim_rcv_v1(skb);
964#endif
965 case IGMP_DVMRP:
966 case IGMP_TRACE:
967 case IGMP_HOST_LEAVE_MESSAGE:
968 case IGMP_MTRACE:
969 case IGMP_MTRACE_RESP:
970 break;
971 default:
dd1c1853 972 break;
1da177e4 973 }
fb286bb2
HX		 974
975drop:
1da177e4
LT		 976 in_dev_put(in_dev);
977 kfree_skb(skb);
978 return 0;
979}
980
981#endif
982
983
984/*
985 * Add a filter to a device
986 */
987
63007727 988static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 989{
990 char buf[MAX_ADDR_LEN];
991 struct net_device *dev = in_dev->dev;
992
993 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
994 We will get multicast token leakage, when IFF_MULTICAST
995 is changed. This check should be done in dev->set_multicast_list
996 routine. Something sort of:
997 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
998 --ANK
999 */
1000 if (arp_mc_map(addr, buf, dev, 0) == 0)
1001 dev_mc_add(dev,buf,dev->addr_len,0);
1002}
1003
1004/*
1005 * Remove a filter from a device
1006 */
1007
63007727 1008static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1009{
1010 char buf[MAX_ADDR_LEN];
1011 struct net_device *dev = in_dev->dev;
1012
1013 if (arp_mc_map(addr, buf, dev, 0) == 0)
1014 dev_mc_delete(dev,buf,dev->addr_len,0);
1015}
1016
1017#ifdef CONFIG_IP_MULTICAST
1018/*
1019 * deleted ip_mc_list manipulation
1020 */
1021static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1022{
1023 struct ip_mc_list *pmc;
1024
1025 /* this is an "ip_mc_list" for convenience; only the fields below
1026 * are actually used. In particular, the refcnt and users are not
1027 * used for management of the delete list. Using the same structure
1028 * for deleted items allows change reports to use common code with
1029 * non-deleted or query-response MCA's.
1030 */
0da974f4 1031 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1032 if (!pmc)
1033 return;
1da177e4
LT		 1034 spin_lock_bh(&im->lock);
1035 pmc->interface = im->interface;
1036 in_dev_hold(in_dev);
1037 pmc->multiaddr = im->multiaddr;
1038 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1039 IGMP_Unsolicited_Report_Count;
1040 pmc->sfmode = im->sfmode;
1041 if (pmc->sfmode == MCAST_INCLUDE) {
1042 struct ip_sf_list *psf;
1043
1044 pmc->tomb = im->tomb;
1045 pmc->sources = im->sources;
1046 im->tomb = im->sources = NULL;
1047 for (psf=pmc->sources; psf; psf=psf->sf_next)
1048 psf->sf_crcount = pmc->crcount;
1049 }
1050 spin_unlock_bh(&im->lock);
1051
1052 spin_lock_bh(&in_dev->mc_tomb_lock);
1053 pmc->next = in_dev->mc_tomb;
1054 in_dev->mc_tomb = pmc;
1055 spin_unlock_bh(&in_dev->mc_tomb_lock);
1056}
1057
63007727 1058static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1059{
1060 struct ip_mc_list *pmc, *pmc_prev;
1061 struct ip_sf_list *psf, *psf_next;
1062
1063 spin_lock_bh(&in_dev->mc_tomb_lock);
1064 pmc_prev = NULL;
1065 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1066 if (pmc->multiaddr == multiaddr)
1067 break;
1068 pmc_prev = pmc;
1069 }
1070 if (pmc) {
1071 if (pmc_prev)
1072 pmc_prev->next = pmc->next;
1073 else
1074 in_dev->mc_tomb = pmc->next;
1075 }
1076 spin_unlock_bh(&in_dev->mc_tomb_lock);
1077 if (pmc) {
1078 for (psf=pmc->tomb; psf; psf=psf_next) {
1079 psf_next = psf->sf_next;
1080 kfree(psf);
1081 }
1082 in_dev_put(pmc->interface);
1083 kfree(pmc);
1084 }
1085}
1086
1087static void igmpv3_clear_delrec(struct in_device *in_dev)
1088{
1089 struct ip_mc_list *pmc, *nextpmc;
1090
1091 spin_lock_bh(&in_dev->mc_tomb_lock);
1092 pmc = in_dev->mc_tomb;
1093 in_dev->mc_tomb = NULL;
1094 spin_unlock_bh(&in_dev->mc_tomb_lock);
1095
1096 for (; pmc; pmc = nextpmc) {
1097 nextpmc = pmc->next;
1098 ip_mc_clear_src(pmc);
1099 in_dev_put(pmc->interface);
1100 kfree(pmc);
1101 }
1102 /* clear dead sources, too */
1103 read_lock(&in_dev->mc_list_lock);
1104 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1105 struct ip_sf_list *psf, *psf_next;
1106
1107 spin_lock_bh(&pmc->lock);
1108 psf = pmc->tomb;
1109 pmc->tomb = NULL;
1110 spin_unlock_bh(&pmc->lock);
1111 for (; psf; psf=psf_next) {
1112 psf_next = psf->sf_next;
1113 kfree(psf);
1114 }
1115 }
1116 read_unlock(&in_dev->mc_list_lock);
1117}
1118#endif
1119
1120static void igmp_group_dropped(struct ip_mc_list *im)
1121{
1122 struct in_device *in_dev = im->interface;
1123#ifdef CONFIG_IP_MULTICAST
1124 int reporter;
1125#endif
1126
1127 if (im->loaded) {
1128 im->loaded = 0;
1129 ip_mc_filter_del(in_dev, im->multiaddr);
1130 }
1131
1132#ifdef CONFIG_IP_MULTICAST
1133 if (im->multiaddr == IGMP_ALL_HOSTS)
1134 return;
1135
1136 reporter = im->reporter;
1137 igmp_stop_timer(im);
1138
1139 if (!in_dev->dead) {
1140 if (IGMP_V1_SEEN(in_dev))
1141 goto done;
1142 if (IGMP_V2_SEEN(in_dev)) {
1143 if (reporter)
1144 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1145 goto done;
1146 }
1147 /* IGMPv3 */
1148 igmpv3_add_delrec(in_dev, im);
1149
1150 igmp_ifc_event(in_dev);
1151 }
1152done:
1153#endif
1154 ip_mc_clear_src(im);
1155}
1156
1157static void igmp_group_added(struct ip_mc_list *im)
1158{
1159 struct in_device *in_dev = im->interface;
1160
1161 if (im->loaded == 0) {
1162 im->loaded = 1;
1163 ip_mc_filter_add(in_dev, im->multiaddr);
1164 }
1165
1166#ifdef CONFIG_IP_MULTICAST
1167 if (im->multiaddr == IGMP_ALL_HOSTS)
1168 return;
1169
1170 if (in_dev->dead)
1171 return;
1172 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1173 spin_lock_bh(&im->lock);
1174 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1175 spin_unlock_bh(&im->lock);
1176 return;
1177 }
1178 /* else, v3 */
1179
1180 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1181 IGMP_Unsolicited_Report_Count;
1182 igmp_ifc_event(in_dev);
1183#endif
1184}
1185
1186
1187/*
1188 * Multicast list managers
1189 */
1190
1191
1192/*
1193 * A socket has joined a multicast group on device dev.
1194 */
1195
8f935bbd 1196void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1197{
1198 struct ip_mc_list *im;
1199
1200 ASSERT_RTNL();
1201
1202 for (im=in_dev->mc_list; im; im=im->next) {
1203 if (im->multiaddr == addr) {
1204 im->users++;
1205 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1206 goto out;
1207 }
1208 }
1209
8b3a7005 1210 im = kmalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1211 if (!im)
1212 goto out;
1213
1214 im->users=1;
1215 im->interface=in_dev;
1216 in_dev_hold(in_dev);
1217 im->multiaddr=addr;
1218 /* initial mode is (EX, empty) */
1219 im->sfmode = MCAST_EXCLUDE;
1220 im->sfcount[MCAST_INCLUDE] = 0;
1221 im->sfcount[MCAST_EXCLUDE] = 1;
1222 im->sources = NULL;
1223 im->tomb = NULL;
1224 im->crcount = 0;
1225 atomic_set(&im->refcnt, 1);
1226 spin_lock_init(&im->lock);
1227#ifdef CONFIG_IP_MULTICAST
1228 im->tm_running=0;
b24b8a24 1229 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1da177e4
LT		 1230 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1231 im->reporter = 0;
1232 im->gsquery = 0;
1233#endif
1234 im->loaded = 0;
1235 write_lock_bh(&in_dev->mc_list_lock);
1236 im->next=in_dev->mc_list;
1237 in_dev->mc_list=im;
1238 write_unlock_bh(&in_dev->mc_list_lock);
1239#ifdef CONFIG_IP_MULTICAST
1240 igmpv3_del_delrec(in_dev, im->multiaddr);
1241#endif
1242 igmp_group_added(im);
1243 if (!in_dev->dead)
1244 ip_rt_multicast_event(in_dev);
1245out:
1246 return;
1247}
1248
a816c7c7
JV		 1249/*
1250 * Resend IGMP JOIN report; used for bonding.
1251 */
1252void ip_mc_rejoin_group(struct ip_mc_list *im)
1253{
08882669 1254#ifdef CONFIG_IP_MULTICAST
a816c7c7
JV		 1255 struct in_device *in_dev = im->interface;
1256
a816c7c7
JV		 1257 if (im->multiaddr == IGMP_ALL_HOSTS)
1258 return;
1259
1260 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1261 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1262 return;
1263 }
1264 /* else, v3 */
1265 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1266 IGMP_Unsolicited_Report_Count;
1267 igmp_ifc_event(in_dev);
1268#endif
1269}
1270
1da177e4
LT		 1271/*
1272 * A socket has left a multicast group on device dev
1273 */
1274
8f935bbd 1275void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1276{
1277 struct ip_mc_list *i, **ip;
e905a9ed 1278
1da177e4 1279 ASSERT_RTNL();
e905a9ed 1280
1da177e4
LT		 1281 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1282 if (i->multiaddr==addr) {
1283 if (--i->users == 0) {
1284 write_lock_bh(&in_dev->mc_list_lock);
1285 *ip = i->next;
1286 write_unlock_bh(&in_dev->mc_list_lock);
1287 igmp_group_dropped(i);
1288
1289 if (!in_dev->dead)
1290 ip_rt_multicast_event(in_dev);
1291
1292 ip_ma_put(i);
1293 return;
1294 }
1295 break;
1296 }
1297 }
1298}
1299
1300/* Device going down */
1301
1302void ip_mc_down(struct in_device *in_dev)
1303{
1304 struct ip_mc_list *i;
1305
1306 ASSERT_RTNL();
1307
1308 for (i=in_dev->mc_list; i; i=i->next)
1309 igmp_group_dropped(i);
1310
1311#ifdef CONFIG_IP_MULTICAST
1312 in_dev->mr_ifc_count = 0;
1313 if (del_timer(&in_dev->mr_ifc_timer))
1314 __in_dev_put(in_dev);
1315 in_dev->mr_gq_running = 0;
1316 if (del_timer(&in_dev->mr_gq_timer))
1317 __in_dev_put(in_dev);
1318 igmpv3_clear_delrec(in_dev);
1319#endif
1320
1321 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1322}
1323
1324void ip_mc_init_dev(struct in_device *in_dev)
1325{
1326 ASSERT_RTNL();
1327
1328 in_dev->mc_tomb = NULL;
1329#ifdef CONFIG_IP_MULTICAST
1330 in_dev->mr_gq_running = 0;
b24b8a24
PE		 1331 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1332 (unsigned long)in_dev);
1da177e4 1333 in_dev->mr_ifc_count = 0;
b24b8a24
PE		 1334 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1335 (unsigned long)in_dev);
1da177e4
LT		 1336 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1337#endif
1338
1339 rwlock_init(&in_dev->mc_list_lock);
1340 spin_lock_init(&in_dev->mc_tomb_lock);
1341}
1342
1343/* Device going up */
1344
1345void ip_mc_up(struct in_device *in_dev)
1346{
1347 struct ip_mc_list *i;
1348
1349 ASSERT_RTNL();
1350
1351 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1352
1353 for (i=in_dev->mc_list; i; i=i->next)
1354 igmp_group_added(i);
1355}
1356
1357/*
1358 * Device is about to be destroyed: clean up.
1359 */
1360
1361void ip_mc_destroy_dev(struct in_device *in_dev)
1362{
1363 struct ip_mc_list *i;
1364
1365 ASSERT_RTNL();
1366
1367 /* Deactivate timers */
1368 ip_mc_down(in_dev);
1369
1370 write_lock_bh(&in_dev->mc_list_lock);
1371 while ((i = in_dev->mc_list) != NULL) {
1372 in_dev->mc_list = i->next;
1373 write_unlock_bh(&in_dev->mc_list_lock);
1374
1375 igmp_group_dropped(i);
1376 ip_ma_put(i);
1377
1378 write_lock_bh(&in_dev->mc_list_lock);
1379 }
1380 write_unlock_bh(&in_dev->mc_list_lock);
1381}
1382
1383static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1384{
1385 struct flowi fl = { .nl_u = { .ip4_u =
1386 { .daddr = imr->imr_multiaddr.s_addr } } };
1387 struct rtable *rt;
1388 struct net_device *dev = NULL;
1389 struct in_device *idev = NULL;
1390
1391 if (imr->imr_ifindex) {
7fee0ca2 1392 idev = inetdev_by_index(&init_net, imr->imr_ifindex);
1da177e4
LT		 1393 if (idev)
1394 __in_dev_put(idev);
1395 return idev;
1396 }
1397 if (imr->imr_address.s_addr) {
1ab35276 1398 dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
1da177e4
LT		 1399 if (!dev)
1400 return NULL;
15333061 1401 dev_put(dev);
1da177e4
LT		 1402 }
1403
f206351a 1404 if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) {
1da177e4
LT		 1405 dev = rt->u.dst.dev;
1406 ip_rt_put(rt);
1407 }
1408 if (dev) {
1409 imr->imr_ifindex = dev->ifindex;
e5ed6399 1410 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1411 }
1412 return idev;
1413}
1414
1415/*
1416 * Join a socket to a group
1417 */
ab32ea5d
BH		 1418int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1419int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1da177e4
LT		 1420
1421
1422static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1423 __be32 *psfsrc)
1da177e4
LT		 1424{
1425 struct ip_sf_list *psf, *psf_prev;
1426 int rv = 0;
1427
1428 psf_prev = NULL;
1429 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1430 if (psf->sf_inaddr == *psfsrc)
1431 break;
1432 psf_prev = psf;
1433 }
1434 if (!psf || psf->sf_count[sfmode] == 0) {
1435 /* source filter not found, or count wrong => bug */
1436 return -ESRCH;
1437 }
1438 psf->sf_count[sfmode]--;
1439 if (psf->sf_count[sfmode] == 0) {
1440 ip_rt_multicast_event(pmc->interface);
1441 }
1442 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1443#ifdef CONFIG_IP_MULTICAST
1444 struct in_device *in_dev = pmc->interface;
1445#endif
1446
1447 /* no more filters for this source */
1448 if (psf_prev)
1449 psf_prev->sf_next = psf->sf_next;
1450 else
1451 pmc->sources = psf->sf_next;
1452#ifdef CONFIG_IP_MULTICAST
1453 if (psf->sf_oldin &&
1454 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
e905a9ed 1455 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1456 IGMP_Unsolicited_Report_Count;
1457 psf->sf_next = pmc->tomb;
1458 pmc->tomb = psf;
1459 rv = 1;
1460 } else
1461#endif
1462 kfree(psf);
1463 }
1464 return rv;
1465}
1466
1467#ifndef CONFIG_IP_MULTICAST
1468#define igmp_ifc_event(x) do { } while (0)
1469#endif
1470
8f935bbd
AV		 1471static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1472 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1473{
1474 struct ip_mc_list *pmc;
1475 int changerec = 0;
1476 int i, err;
1477
1478 if (!in_dev)
1479 return -ENODEV;
1480 read_lock(&in_dev->mc_list_lock);
1481 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1482 if (*pmca == pmc->multiaddr)
1483 break;
1484 }
1485 if (!pmc) {
1486 /* MCA not found?? bug */
1487 read_unlock(&in_dev->mc_list_lock);
1488 return -ESRCH;
1489 }
1490 spin_lock_bh(&pmc->lock);
1491 read_unlock(&in_dev->mc_list_lock);
1492#ifdef CONFIG_IP_MULTICAST
1493 sf_markstate(pmc);
1494#endif
1495 if (!delta) {
1496 err = -EINVAL;
1497 if (!pmc->sfcount[sfmode])
1498 goto out_unlock;
1499 pmc->sfcount[sfmode]--;
1500 }
1501 err = 0;
1502 for (i=0; i<sfcount; i++) {
1503 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1504
1505 changerec |= rv > 0;
1506 if (!err && rv < 0)
1507 err = rv;
1508 }
1509 if (pmc->sfmode == MCAST_EXCLUDE &&
1510 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1511 pmc->sfcount[MCAST_INCLUDE]) {
1512#ifdef CONFIG_IP_MULTICAST
1513 struct ip_sf_list *psf;
1514#endif
1515
1516 /* filter mode change */
1517 pmc->sfmode = MCAST_INCLUDE;
1518#ifdef CONFIG_IP_MULTICAST
e905a9ed 1519 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1520 IGMP_Unsolicited_Report_Count;
1521 in_dev->mr_ifc_count = pmc->crcount;
1522 for (psf=pmc->sources; psf; psf = psf->sf_next)
1523 psf->sf_crcount = 0;
1524 igmp_ifc_event(pmc->interface);
1525 } else if (sf_setstate(pmc) || changerec) {
1526 igmp_ifc_event(pmc->interface);
1527#endif
1528 }
1529out_unlock:
1530 spin_unlock_bh(&pmc->lock);
1531 return err;
1532}
1533
1534/*
1535 * Add multicast single-source filter to the interface list
1536 */
1537static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1538 __be32 *psfsrc, int delta)
1da177e4
LT		 1539{
1540 struct ip_sf_list *psf, *psf_prev;
1541
1542 psf_prev = NULL;
1543 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1544 if (psf->sf_inaddr == *psfsrc)
1545 break;
1546 psf_prev = psf;
1547 }
1548 if (!psf) {
0da974f4 1549 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1550 if (!psf)
1551 return -ENOBUFS;
1da177e4
LT		 1552 psf->sf_inaddr = *psfsrc;
1553 if (psf_prev) {
1554 psf_prev->sf_next = psf;
1555 } else
1556 pmc->sources = psf;
1557 }
1558 psf->sf_count[sfmode]++;
1559 if (psf->sf_count[sfmode] == 1) {
1560 ip_rt_multicast_event(pmc->interface);
1561 }
1562 return 0;
1563}
1564
1565#ifdef CONFIG_IP_MULTICAST
1566static void sf_markstate(struct ip_mc_list *pmc)
1567{
1568 struct ip_sf_list *psf;
1569 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1570
1571 for (psf=pmc->sources; psf; psf=psf->sf_next)
1572 if (pmc->sfcount[MCAST_EXCLUDE]) {
1573 psf->sf_oldin = mca_xcount ==
1574 psf->sf_count[MCAST_EXCLUDE] &&
1575 !psf->sf_count[MCAST_INCLUDE];
1576 } else
1577 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1578}
1579
1580static int sf_setstate(struct ip_mc_list *pmc)
1581{
ad12583f 1582 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1583 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1584 int qrv = pmc->interface->mr_qrv;
1585 int new_in, rv;
1586
1587 rv = 0;
1588 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1589 if (pmc->sfcount[MCAST_EXCLUDE]) {
1590 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1591 !psf->sf_count[MCAST_INCLUDE];
1592 } else
1593 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1594 if (new_in) {
1595 if (!psf->sf_oldin) {
76edc605 1596 struct ip_sf_list *prev = NULL;
ad12583f
DS		 1597
1598 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1599 if (dpsf->sf_inaddr == psf->sf_inaddr)
1600 break;
1601 prev = dpsf;
1602 }
1603 if (dpsf) {
1604 if (prev)
1605 prev->sf_next = dpsf->sf_next;
1606 else
1607 pmc->tomb = dpsf->sf_next;
1608 kfree(dpsf);
1609 }
1610 psf->sf_crcount = qrv;
1611 rv++;
1612 }
1613 } else if (psf->sf_oldin) {
1614
1615 psf->sf_crcount = 0;
1616 /*
1617 * add or update "delete" records if an active filter
1618 * is now inactive
1619 */
1620 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1621 if (dpsf->sf_inaddr == psf->sf_inaddr)
1622 break;
1623 if (!dpsf) {
1624 dpsf = (struct ip_sf_list *)
1625 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1626 if (!dpsf)
1627 continue;
1628 *dpsf = *psf;
1629 /* pmc->lock held by callers */
1630 dpsf->sf_next = pmc->tomb;
1631 pmc->tomb = dpsf;
1632 }
1633 dpsf->sf_crcount = qrv;
1da177e4
LT		 1634 rv++;
1635 }
1636 }
1637 return rv;
1638}
1639#endif
1640
1641/*
1642 * Add multicast source filter list to the interface list
1643 */
8f935bbd
AV		 1644static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1645 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1646{
1647 struct ip_mc_list *pmc;
1648 int isexclude;
1649 int i, err;
1650
1651 if (!in_dev)
1652 return -ENODEV;
1653 read_lock(&in_dev->mc_list_lock);
1654 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1655 if (*pmca == pmc->multiaddr)
1656 break;
1657 }
1658 if (!pmc) {
1659 /* MCA not found?? bug */
1660 read_unlock(&in_dev->mc_list_lock);
1661 return -ESRCH;
1662 }
1663 spin_lock_bh(&pmc->lock);
1664 read_unlock(&in_dev->mc_list_lock);
1665
1666#ifdef CONFIG_IP_MULTICAST
1667 sf_markstate(pmc);
1668#endif
1669 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1670 if (!delta)
1671 pmc->sfcount[sfmode]++;
1672 err = 0;
1673 for (i=0; i<sfcount; i++) {
1674 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1675 if (err)
1676 break;
1677 }
1678 if (err) {
1679 int j;
1680
1681 pmc->sfcount[sfmode]--;
1682 for (j=0; j<i; j++)
1683 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1684 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1685#ifdef CONFIG_IP_MULTICAST
1da177e4 1686 struct ip_sf_list *psf;
cfcabdcc 1687 in_dev = pmc->interface;
1da177e4
LT		 1688#endif
1689
1690 /* filter mode change */
1691 if (pmc->sfcount[MCAST_EXCLUDE])
1692 pmc->sfmode = MCAST_EXCLUDE;
1693 else if (pmc->sfcount[MCAST_INCLUDE])
1694 pmc->sfmode = MCAST_INCLUDE;
1695#ifdef CONFIG_IP_MULTICAST
1696 /* else no filters; keep old mode for reports */
1697
e905a9ed 1698 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1699 IGMP_Unsolicited_Report_Count;
1700 in_dev->mr_ifc_count = pmc->crcount;
1701 for (psf=pmc->sources; psf; psf = psf->sf_next)
1702 psf->sf_crcount = 0;
1703 igmp_ifc_event(in_dev);
1704 } else if (sf_setstate(pmc)) {
1705 igmp_ifc_event(in_dev);
1706#endif
1707 }
1708 spin_unlock_bh(&pmc->lock);
1709 return err;
1710}
1711
1712static void ip_mc_clear_src(struct ip_mc_list *pmc)
1713{
1714 struct ip_sf_list *psf, *nextpsf;
1715
1716 for (psf=pmc->tomb; psf; psf=nextpsf) {
1717 nextpsf = psf->sf_next;
1718 kfree(psf);
1719 }
1720 pmc->tomb = NULL;
1721 for (psf=pmc->sources; psf; psf=nextpsf) {
1722 nextpsf = psf->sf_next;
1723 kfree(psf);
1724 }
1725 pmc->sources = NULL;
1726 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1727 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1728 pmc->sfcount[MCAST_EXCLUDE] = 1;
1729}
1730
1731
1732/*
1733 * Join a multicast group
1734 */
1735int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1736{
1737 int err;
8f935bbd 1738 __be32 addr = imr->imr_multiaddr.s_addr;
ca9b907d 1739 struct ip_mc_socklist *iml=NULL, *i;
1da177e4
LT		 1740 struct in_device *in_dev;
1741 struct inet_sock *inet = inet_sk(sk);
ca9b907d 1742 int ifindex;
1da177e4
LT		 1743 int count = 0;
1744
f97c1e0c 1745 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1746 return -EINVAL;
1747
6756ae4b 1748 rtnl_lock();
1da177e4
LT		 1749
1750 in_dev = ip_mc_find_dev(imr);
1751
1752 if (!in_dev) {
1753 iml = NULL;
1754 err = -ENODEV;
1755 goto done;
1756 }
1757
1da177e4 1758 err = -EADDRINUSE;
ca9b907d 1759 ifindex = imr->imr_ifindex;
1da177e4 1760 for (i = inet->mc_list; i; i = i->next) {
ca9b907d
DS		 1761 if (i->multi.imr_multiaddr.s_addr == addr &&
1762 i->multi.imr_ifindex == ifindex)
1da177e4 1763 goto done;
1da177e4
LT		 1764 count++;
1765 }
1766 err = -ENOBUFS;
ca9b907d
DS		 1767 if (count >= sysctl_igmp_max_memberships)
1768 goto done;
8b3a7005 1769 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
ca9b907d 1770 if (iml == NULL)
1da177e4 1771 goto done;
ca9b907d 1772
1da177e4
LT		 1773 memcpy(&iml->multi, imr, sizeof(*imr));
1774 iml->next = inet->mc_list;
1da177e4
LT		 1775 iml->sflist = NULL;
1776 iml->sfmode = MCAST_EXCLUDE;
1777 inet->mc_list = iml;
1778 ip_mc_inc_group(in_dev, addr);
1da177e4 1779 err = 0;
1da177e4 1780done:
6756ae4b 1781 rtnl_unlock();
1da177e4
LT		 1782 return err;
1783}
1784
1785static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1786 struct in_device *in_dev)
1787{
1788 int err;
1789
cfcabdcc 1790 if (iml->sflist == NULL) {
1da177e4
LT		 1791 /* any-source empty exclude case */
1792 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1793 iml->sfmode, 0, NULL, 0);
1794 }
1795 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1796 iml->sfmode, iml->sflist->sl_count,
1797 iml->sflist->sl_addr, 0);
1798 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1799 iml->sflist = NULL;
1800 return err;
1801}
1802
1803/*
1804 * Ask a socket to leave a group.
1805 */
1806
1807int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1808{
1809 struct inet_sock *inet = inet_sk(sk);
1810 struct ip_mc_socklist *iml, **imlp;
84b42bae 1811 struct in_device *in_dev;
8f935bbd 1812 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1813 u32 ifindex;
acd6e00b 1814 int ret = -EADDRNOTAVAIL;
1da177e4
LT		 1815
1816 rtnl_lock();
84b42bae 1817 in_dev = ip_mc_find_dev(imr);
84b42bae 1818 ifindex = imr->imr_ifindex;
1da177e4 1819 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
acd6e00b
DS		 1820 if (iml->multi.imr_multiaddr.s_addr != group)
1821 continue;
1822 if (ifindex) {
1823 if (iml->multi.imr_ifindex != ifindex)
1824 continue;
1825 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1826 iml->multi.imr_address.s_addr)
1827 continue;
1da177e4 1828
acd6e00b 1829 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4 1830
acd6e00b
DS		 1831 *imlp = iml->next;
1832
1833 if (in_dev)
84b42bae 1834 ip_mc_dec_group(in_dev, group);
acd6e00b
DS		 1835 rtnl_unlock();
1836 sock_kfree_s(sk, iml, sizeof(*iml));
1837 return 0;
1da177e4 1838 }
acd6e00b
DS		 1839 if (!in_dev)
1840 ret = -ENODEV;
1da177e4 1841 rtnl_unlock();
acd6e00b 1842 return ret;
1da177e4
LT		 1843}
1844
1845int ip_mc_source(int add, int omode, struct sock *sk, struct
1846 ip_mreq_source *mreqs, int ifindex)
1847{
1848 int err;
1849 struct ip_mreqn imr;
63007727 1850 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 1851 struct ip_mc_socklist *pmc;
1852 struct in_device *in_dev = NULL;
1853 struct inet_sock *inet = inet_sk(sk);
1854 struct ip_sf_socklist *psl;
8cdaaa15 1855 int leavegroup = 0;
1da177e4
LT		 1856 int i, j, rv;
1857
f97c1e0c 1858 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1859 return -EINVAL;
1860
6756ae4b 1861 rtnl_lock();
1da177e4
LT		 1862
1863 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1864 imr.imr_address.s_addr = mreqs->imr_interface;
1865 imr.imr_ifindex = ifindex;
1866 in_dev = ip_mc_find_dev(&imr);
1867
1868 if (!in_dev) {
1869 err = -ENODEV;
1870 goto done;
1871 }
1872 err = -EADDRNOTAVAIL;
1873
1874 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
ca9b907d
DS		 1875 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1876 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1da177e4
LT		 1877 break;
1878 }
917f2f10
DS		 1879 if (!pmc) { /* must have a prior join */
1880 err = -EINVAL;
1da177e4 1881 goto done;
917f2f10 1882 }
1da177e4
LT		 1883 /* if a source filter was set, must be the same mode as before */
1884 if (pmc->sflist) {
917f2f10
DS		 1885 if (pmc->sfmode != omode) {
1886 err = -EINVAL;
1da177e4 1887 goto done;
917f2f10 1888 }
1da177e4
LT		 1889 } else if (pmc->sfmode != omode) {
1890 /* allow mode switches for empty-set filters */
1891 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 1892 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 1893 NULL, 0);
1894 pmc->sfmode = omode;
1895 }
1896
1897 psl = pmc->sflist;
1898 if (!add) {
1899 if (!psl)
917f2f10 1900 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1901 rv = !0;
1902 for (i=0; i<psl->sl_count; i++) {
1903 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1904 sizeof(__be32));
1da177e4
LT		 1905 if (rv == 0)
1906 break;
1907 }
1908 if (rv) /* source not found */
917f2f10 1909 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1910
8cdaaa15
DS		 1911 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1912 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1913 leavegroup = 1;
1914 goto done;
1915 }
1916
1da177e4 1917 /* update the interface filter */
e905a9ed 1918 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1919 &mreqs->imr_sourceaddr, 1);
1920
1921 for (j=i+1; j<psl->sl_count; j++)
1922 psl->sl_addr[j-1] = psl->sl_addr[j];
1923 psl->sl_count--;
1924 err = 0;
1925 goto done;
1926 }
1927 /* else, add a new source to the filter */
1928
1929 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1930 err = -ENOBUFS;
1931 goto done;
1932 }
1933 if (!psl || psl->sl_count == psl->sl_max) {
1934 struct ip_sf_socklist *newpsl;
1935 int count = IP_SFBLOCK;
1936
1937 if (psl)
1938 count += psl->sl_max;
8b3a7005 1939 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 1940 if (!newpsl) {
1941 err = -ENOBUFS;
1942 goto done;
1943 }
1944 newpsl->sl_max = count;
1945 newpsl->sl_count = count - IP_SFBLOCK;
1946 if (psl) {
1947 for (i=0; i<psl->sl_count; i++)
1948 newpsl->sl_addr[i] = psl->sl_addr[i];
1949 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1950 }
1951 pmc->sflist = psl = newpsl;
1952 }
1953 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1954 for (i=0; i<psl->sl_count; i++) {
1955 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1956 sizeof(__be32));
1da177e4
LT		 1957 if (rv == 0)
1958 break;
1959 }
1960 if (rv == 0) /* address already there is an error */
1961 goto done;
1962 for (j=psl->sl_count-1; j>=i; j--)
1963 psl->sl_addr[j+1] = psl->sl_addr[j];
1964 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1965 psl->sl_count++;
1966 err = 0;
1967 /* update the interface list */
e905a9ed 1968 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1969 &mreqs->imr_sourceaddr, 1);
1970done:
6756ae4b 1971 rtnl_unlock();
8cdaaa15
DS		 1972 if (leavegroup)
1973 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 1974 return err;
1975}
1976
1977int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1978{
9951f036 1979 int err = 0;
1da177e4 1980 struct ip_mreqn imr;
63007727 1981 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 1982 struct ip_mc_socklist *pmc;
1983 struct in_device *in_dev;
1984 struct inet_sock *inet = inet_sk(sk);
1985 struct ip_sf_socklist *newpsl, *psl;
9951f036 1986 int leavegroup = 0;
1da177e4 1987
f97c1e0c 1988 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1989 return -EINVAL;
1990 if (msf->imsf_fmode != MCAST_INCLUDE &&
1991 msf->imsf_fmode != MCAST_EXCLUDE)
1992 return -EINVAL;
1993
6756ae4b 1994 rtnl_lock();
1da177e4
LT		 1995
1996 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1997 imr.imr_address.s_addr = msf->imsf_interface;
1998 imr.imr_ifindex = ifindex;
1999 in_dev = ip_mc_find_dev(&imr);
2000
2001 if (!in_dev) {
2002 err = -ENODEV;
2003 goto done;
2004 }
1da177e4 2005
9951f036
DS		 2006 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2007 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2008 leavegroup = 1;
2009 goto done;
2010 }
2011
1da177e4
LT		 2012 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2013 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2014 pmc->multi.imr_ifindex == imr.imr_ifindex)
2015 break;
2016 }
917f2f10
DS		 2017 if (!pmc) { /* must have a prior join */
2018 err = -EINVAL;
1da177e4 2019 goto done;
917f2f10 2020 }
1da177e4 2021 if (msf->imsf_numsrc) {
8b3a7005
KK		 2022 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2023 GFP_KERNEL);
1da177e4
LT		 2024 if (!newpsl) {
2025 err = -ENOBUFS;
2026 goto done;
2027 }
2028 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2029 memcpy(newpsl->sl_addr, msf->imsf_slist,
2030 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2031 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2032 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2033 if (err) {
2034 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2035 goto done;
2036 }
8713dbf0 2037 } else {
1da177e4 2038 newpsl = NULL;
8713dbf0
YZ		 2039 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2040 msf->imsf_fmode, 0, NULL, 0);
2041 }
1da177e4
LT		 2042 psl = pmc->sflist;
2043 if (psl) {
2044 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2045 psl->sl_count, psl->sl_addr, 0);
2046 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2047 } else
2048 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2049 0, NULL, 0);
2050 pmc->sflist = newpsl;
2051 pmc->sfmode = msf->imsf_fmode;
917f2f10 2052 err = 0;
1da177e4 2053done:
6756ae4b 2054 rtnl_unlock();
9951f036
DS		 2055 if (leavegroup)
2056 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2057 return err;
2058}
2059
2060int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2061 struct ip_msfilter __user *optval, int __user *optlen)
2062{
2063 int err, len, count, copycount;
2064 struct ip_mreqn imr;
63007727 2065 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2066 struct ip_mc_socklist *pmc;
2067 struct in_device *in_dev;
2068 struct inet_sock *inet = inet_sk(sk);
2069 struct ip_sf_socklist *psl;
2070
f97c1e0c 2071 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2072 return -EINVAL;
2073
6756ae4b 2074 rtnl_lock();
1da177e4
LT		 2075
2076 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2077 imr.imr_address.s_addr = msf->imsf_interface;
2078 imr.imr_ifindex = 0;
2079 in_dev = ip_mc_find_dev(&imr);
2080
2081 if (!in_dev) {
2082 err = -ENODEV;
2083 goto done;
2084 }
2085 err = -EADDRNOTAVAIL;
2086
2087 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2088 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2089 pmc->multi.imr_ifindex == imr.imr_ifindex)
2090 break;
2091 }
2092 if (!pmc) /* must have a prior join */
2093 goto done;
2094 msf->imsf_fmode = pmc->sfmode;
2095 psl = pmc->sflist;
6756ae4b 2096 rtnl_unlock();
1da177e4
LT		 2097 if (!psl) {
2098 len = 0;
2099 count = 0;
2100 } else {
2101 count = psl->sl_count;
2102 }
2103 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2104 len = copycount * sizeof(psl->sl_addr[0]);
2105 msf->imsf_numsrc = count;
2106 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2107 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2108 return -EFAULT;
2109 }
2110 if (len &&
2111 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2112 return -EFAULT;
2113 return 0;
2114done:
6756ae4b 2115 rtnl_unlock();
1da177e4
LT		 2116 return err;
2117}
2118
2119int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2120 struct group_filter __user *optval, int __user *optlen)
2121{
2122 int err, i, count, copycount;
2123 struct sockaddr_in *psin;
63007727 2124 __be32 addr;
1da177e4
LT		 2125 struct ip_mc_socklist *pmc;
2126 struct inet_sock *inet = inet_sk(sk);
2127 struct ip_sf_socklist *psl;
2128
2129 psin = (struct sockaddr_in *)&gsf->gf_group;
2130 if (psin->sin_family != AF_INET)
2131 return -EINVAL;
2132 addr = psin->sin_addr.s_addr;
f97c1e0c 2133 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2134 return -EINVAL;
2135
6756ae4b 2136 rtnl_lock();
1da177e4
LT		 2137
2138 err = -EADDRNOTAVAIL;
2139
2140 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2141 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2142 pmc->multi.imr_ifindex == gsf->gf_interface)
2143 break;
2144 }
2145 if (!pmc) /* must have a prior join */
2146 goto done;
2147 gsf->gf_fmode = pmc->sfmode;
2148 psl = pmc->sflist;
6756ae4b 2149 rtnl_unlock();
1da177e4
LT		 2150 count = psl ? psl->sl_count : 0;
2151 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2152 gsf->gf_numsrc = count;
2153 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2154 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2155 return -EFAULT;
2156 }
2157 for (i=0; i<copycount; i++) {
1da177e4
LT		 2158 struct sockaddr_storage ss;
2159
2160 psin = (struct sockaddr_in *)&ss;
2161 memset(&ss, 0, sizeof(ss));
2162 psin->sin_family = AF_INET;
2163 psin->sin_addr.s_addr = psl->sl_addr[i];
2164 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2165 return -EFAULT;
2166 }
2167 return 0;
2168done:
6756ae4b 2169 rtnl_unlock();
1da177e4
LT		 2170 return err;
2171}
2172
2173/*
2174 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2175 */
c0cda068 2176int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2177{
2178 struct inet_sock *inet = inet_sk(sk);
2179 struct ip_mc_socklist *pmc;
2180 struct ip_sf_socklist *psl;
2181 int i;
2182
f97c1e0c 2183 if (!ipv4_is_multicast(loc_addr))
1da177e4
LT		 2184 return 1;
2185
2186 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2187 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2188 pmc->multi.imr_ifindex == dif)
2189 break;
2190 }
2191 if (!pmc)
2192 return 1;
2193 psl = pmc->sflist;
2194 if (!psl)
2195 return pmc->sfmode == MCAST_EXCLUDE;
2196
2197 for (i=0; i<psl->sl_count; i++) {
2198 if (psl->sl_addr[i] == rmt_addr)
2199 break;
2200 }
2201 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2202 return 0;
2203 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2204 return 0;
2205 return 1;
2206}
2207
2208/*
2209 * A socket is closing.
2210 */
2211
2212void ip_mc_drop_socket(struct sock *sk)
2213{
2214 struct inet_sock *inet = inet_sk(sk);
2215 struct ip_mc_socklist *iml;
2216
2217 if (inet->mc_list == NULL)
2218 return;
2219
2220 rtnl_lock();
2221 while ((iml = inet->mc_list) != NULL) {
2222 struct in_device *in_dev;
2223 inet->mc_list = iml->next;
2224
7fee0ca2 2225 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex);
bb699cbc
MR		 2226 (void) ip_mc_leave_src(sk, iml, in_dev);
2227 if (in_dev != NULL) {
1da177e4
LT		 2228 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2229 in_dev_put(in_dev);
2230 }
2231 sock_kfree_s(sk, iml, sizeof(*iml));
1da177e4
LT		 2232 }
2233 rtnl_unlock();
2234}
2235
a60c4923 2236int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2237{
2238 struct ip_mc_list *im;
2239 struct ip_sf_list *psf;
2240 int rv = 0;
2241
2242 read_lock(&in_dev->mc_list_lock);
2243 for (im=in_dev->mc_list; im; im=im->next) {
2244 if (im->multiaddr == mc_addr)
2245 break;
2246 }
2247 if (im && proto == IPPROTO_IGMP) {
2248 rv = 1;
2249 } else if (im) {
2250 if (src_addr) {
2251 for (psf=im->sources; psf; psf=psf->sf_next) {
2252 if (psf->sf_inaddr == src_addr)
2253 break;
2254 }
2255 if (psf)
2256 rv = psf->sf_count[MCAST_INCLUDE] ||
2257 psf->sf_count[MCAST_EXCLUDE] !=
2258 im->sfcount[MCAST_EXCLUDE];
2259 else
2260 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2261 } else
2262 rv = 1; /* unspecified source; tentatively allow */
2263 }
2264 read_unlock(&in_dev->mc_list_lock);
2265 return rv;
2266}
2267
2268#if defined(CONFIG_PROC_FS)
2269struct igmp_mc_iter_state {
2270 struct net_device *dev;
2271 struct in_device *in_dev;
2272};
2273
2274#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2275
2276static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2277{
2278 struct ip_mc_list *im = NULL;
2279 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2280
7562f876 2281 state->in_dev = NULL;
881d966b 2282 for_each_netdev(&init_net, state->dev) {
1da177e4
LT		 2283 struct in_device *in_dev;
2284 in_dev = in_dev_get(state->dev);
2285 if (!in_dev)
2286 continue;
2287 read_lock(&in_dev->mc_list_lock);
2288 im = in_dev->mc_list;
2289 if (im) {
2290 state->in_dev = in_dev;
2291 break;
2292 }
2293 read_unlock(&in_dev->mc_list_lock);
2294 in_dev_put(in_dev);
2295 }
2296 return im;
2297}
2298
2299static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2300{
2301 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2302 im = im->next;
2303 while (!im) {
2304 if (likely(state->in_dev != NULL)) {
2305 read_unlock(&state->in_dev->mc_list_lock);
2306 in_dev_put(state->in_dev);
2307 }
7562f876 2308 state->dev = next_net_device(state->dev);
1da177e4
LT		 2309 if (!state->dev) {
2310 state->in_dev = NULL;
2311 break;
2312 }
2313 state->in_dev = in_dev_get(state->dev);
2314 if (!state->in_dev)
2315 continue;
2316 read_lock(&state->in_dev->mc_list_lock);
2317 im = state->in_dev->mc_list;
2318 }
2319 return im;
2320}
2321
2322static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2323{
2324 struct ip_mc_list *im = igmp_mc_get_first(seq);
2325 if (im)
2326 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2327 --pos;
2328 return pos ? NULL : im;
2329}
2330
2331static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
dd329bfa 2332 __acquires(dev_base_lock)
1da177e4
LT		 2333{
2334 read_lock(&dev_base_lock);
2335 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2336}
2337
2338static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2339{
2340 struct ip_mc_list *im;
2341 if (v == SEQ_START_TOKEN)
2342 im = igmp_mc_get_first(seq);
2343 else
2344 im = igmp_mc_get_next(seq, v);
2345 ++*pos;
2346 return im;
2347}
2348
2349static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
dd329bfa 2350 __releases(dev_base_lock)
1da177e4
LT		 2351{
2352 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2353 if (likely(state->in_dev != NULL)) {
2354 read_unlock(&state->in_dev->mc_list_lock);
2355 in_dev_put(state->in_dev);
2356 state->in_dev = NULL;
2357 }
2358 state->dev = NULL;
2359 read_unlock(&dev_base_lock);
2360}
2361
2362static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2363{
2364 if (v == SEQ_START_TOKEN)
e905a9ed 2365 seq_puts(seq,
1da177e4
LT		 2366 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2367 else {
2368 struct ip_mc_list *im = (struct ip_mc_list *)v;
2369 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2370 char *querier;
2371#ifdef CONFIG_IP_MULTICAST
2372 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2373 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2374 "V3";
2375#else
2376 querier = "NONE";
2377#endif
2378
2379 if (state->in_dev->mc_list == im) {
2380 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2381 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2382 }
2383
2384 seq_printf(seq,
338fcf98 2385 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4
LT		 2386 im->multiaddr, im->users,
2387 im->tm_running, im->tm_running ?
2388 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2389 im->reporter);
2390 }
2391 return 0;
2392}
2393
f690808e 2394static const struct seq_operations igmp_mc_seq_ops = {
1da177e4
LT		 2395 .start = igmp_mc_seq_start,
2396 .next = igmp_mc_seq_next,
2397 .stop = igmp_mc_seq_stop,
2398 .show = igmp_mc_seq_show,
2399};
2400
2401static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2402{
cf7732e4
PE		 2403 return seq_open_private(file, &igmp_mc_seq_ops,
2404 sizeof(struct igmp_mc_iter_state));
1da177e4
LT		 2405}
2406
9a32144e 2407static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2408 .owner = THIS_MODULE,
2409 .open = igmp_mc_seq_open,
2410 .read = seq_read,
2411 .llseek = seq_lseek,
2412 .release = seq_release_private,
2413};
2414
2415struct igmp_mcf_iter_state {
2416 struct net_device *dev;
2417 struct in_device *idev;
2418 struct ip_mc_list *im;
2419};
2420
2421#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2422
2423static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2424{
2425 struct ip_sf_list *psf = NULL;
2426 struct ip_mc_list *im = NULL;
2427 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2428
7562f876
PE		 2429 state->idev = NULL;
2430 state->im = NULL;
881d966b 2431 for_each_netdev(&init_net, state->dev) {
1da177e4
LT		 2432 struct in_device *idev;
2433 idev = in_dev_get(state->dev);
2434 if (unlikely(idev == NULL))
2435 continue;
2436 read_lock(&idev->mc_list_lock);
2437 im = idev->mc_list;
2438 if (likely(im != NULL)) {
2439 spin_lock_bh(&im->lock);
2440 psf = im->sources;
2441 if (likely(psf != NULL)) {
2442 state->im = im;
2443 state->idev = idev;
2444 break;
2445 }
2446 spin_unlock_bh(&im->lock);
2447 }
2448 read_unlock(&idev->mc_list_lock);
2449 in_dev_put(idev);
2450 }
2451 return psf;
2452}
2453
2454static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2455{
2456 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2457
2458 psf = psf->sf_next;
2459 while (!psf) {
2460 spin_unlock_bh(&state->im->lock);
2461 state->im = state->im->next;
2462 while (!state->im) {
2463 if (likely(state->idev != NULL)) {
2464 read_unlock(&state->idev->mc_list_lock);
2465 in_dev_put(state->idev);
2466 }
7562f876 2467 state->dev = next_net_device(state->dev);
1da177e4
LT		 2468 if (!state->dev) {
2469 state->idev = NULL;
2470 goto out;
2471 }
2472 state->idev = in_dev_get(state->dev);
2473 if (!state->idev)
2474 continue;
2475 read_lock(&state->idev->mc_list_lock);
2476 state->im = state->idev->mc_list;
2477 }
2478 if (!state->im)
2479 break;
2480 spin_lock_bh(&state->im->lock);
2481 psf = state->im->sources;
2482 }
2483out:
2484 return psf;
2485}
2486
2487static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2488{
2489 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2490 if (psf)
2491 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2492 --pos;
2493 return pos ? NULL : psf;
2494}
2495
2496static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2497{
2498 read_lock(&dev_base_lock);
2499 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2500}
2501
2502static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2503{
2504 struct ip_sf_list *psf;
2505 if (v == SEQ_START_TOKEN)
2506 psf = igmp_mcf_get_first(seq);
2507 else
2508 psf = igmp_mcf_get_next(seq, v);
2509 ++*pos;
2510 return psf;
2511}
2512
2513static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2514{
2515 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2516 if (likely(state->im != NULL)) {
2517 spin_unlock_bh(&state->im->lock);
2518 state->im = NULL;
2519 }
2520 if (likely(state->idev != NULL)) {
2521 read_unlock(&state->idev->mc_list_lock);
2522 in_dev_put(state->idev);
2523 state->idev = NULL;
2524 }
2525 state->dev = NULL;
2526 read_unlock(&dev_base_lock);
2527}
2528
2529static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2530{
2531 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2532 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2533
2534 if (v == SEQ_START_TOKEN) {
e905a9ed 2535 seq_printf(seq,
1da177e4
LT		 2536 "%3s %6s "
2537 "%10s %10s %6s %6s\n", "Idx",
2538 "Device", "MCA",
2539 "SRC", "INC", "EXC");
2540 } else {
2541 seq_printf(seq,
2542 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2543 "0x%08x %6lu %6lu\n",
2544 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2545 ntohl(state->im->multiaddr),
2546 ntohl(psf->sf_inaddr),
2547 psf->sf_count[MCAST_INCLUDE],
2548 psf->sf_count[MCAST_EXCLUDE]);
2549 }
2550 return 0;
2551}
2552
f690808e 2553static const struct seq_operations igmp_mcf_seq_ops = {
1da177e4
LT		 2554 .start = igmp_mcf_seq_start,
2555 .next = igmp_mcf_seq_next,
2556 .stop = igmp_mcf_seq_stop,
2557 .show = igmp_mcf_seq_show,
2558};
2559
2560static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2561{
cf7732e4
PE		 2562 return seq_open_private(file, &igmp_mcf_seq_ops,
2563 sizeof(struct igmp_mcf_iter_state));
1da177e4
LT		 2564}
2565
9a32144e 2566static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2567 .owner = THIS_MODULE,
2568 .open = igmp_mcf_seq_open,
2569 .read = seq_read,
2570 .llseek = seq_lseek,
2571 .release = seq_release_private,
2572};
2573
2574int __init igmp_mc_proc_init(void)
2575{
457c4cbc
EB		 2576 proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2577 proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
1da177e4
LT		 2578 return 0;
2579}
2580#endif
2581
2582EXPORT_SYMBOL(ip_mc_dec_group);
2583EXPORT_SYMBOL(ip_mc_inc_group);
2584EXPORT_SYMBOL(ip_mc_join_group);
a816c7c7 2585EXPORT_SYMBOL(ip_mc_rejoin_group);
Clone of davem's net-next-2.6 tree