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Revert "pkt_sched: sch_sfq: dump a real number of flows"
[deliverable/linux.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 *
1da177e4
LT		 11 * Authors:
12 * Alan Cox <Alan.Cox@linux.org>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 * Fixes:
20 *
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
23 * functions.
24 * Alan Cox : Dumped the header building experiment.
25 * Alan Cox : Minor tweaks ready for multicast routing
26 * and extended IGMP protocol.
27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
28 * writes utterly bogus code otherwise (sigh)
29 * fixed IGMP loopback to behave in the manner
30 * desired by mrouted, fixed the fact it has been
31 * broken since 1.3.6 and cleaned up a few minor
32 * points.
33 *
34 * Chih-Jen Chang : Tried to revise IGMP to Version 2
35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
e905a9ed 36 * The enhancements are mainly based on Steve Deering's
1da177e4
LT		 37 * ipmulti-3.5 source code.
38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
40 * the mrouted version on that device.
41 * Chih-Jen Chang : Added the max_resp_time parameter to
42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
43 * to identify the multicast router version
44 * and do what the IGMP version 2 specified.
45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
46 * Tsu-Sheng Tsao if the specified time expired.
47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
48 * Alan Cox : Use GFP_ATOMIC in the right places.
49 * Christian Daudt : igmp timer wasn't set for local group
e905a9ed
YH		 50 * memberships but was being deleted,
51 * which caused a "del_timer() called
1da177e4
LT		 52 * from %p with timer not initialized\n"
53 * message (960131).
e905a9ed 54 * Christian Daudt : removed del_timer from
1da177e4
LT		 55 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
58 * true (960216).
59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
60 * igmp_heard_query never trigger. Expiry
61 * miscalculation fixed in igmp_heard_query
62 * and random() made to return unsigned to
63 * prevent negative expiry times.
64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
65 * fix from pending 2.1.x patches.
66 * Alan Cox: Forget to enable FDDI support earlier.
67 * Alexey Kuznetsov: Fixed leaving groups on device down.
68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
69 * David L Stevens: IGMPv3 support, with help from
70 * Vinay Kulkarni
71 */
72
1da177e4
LT		 73#include <linux/module.h>
74#include <asm/uaccess.h>
75#include <asm/system.h>
76#include <linux/types.h>
77#include <linux/kernel.h>
78#include <linux/jiffies.h>
79#include <linux/string.h>
80#include <linux/socket.h>
81#include <linux/sockios.h>
82#include <linux/in.h>
83#include <linux/inet.h>
84#include <linux/netdevice.h>
85#include <linux/skbuff.h>
86#include <linux/inetdevice.h>
87#include <linux/igmp.h>
88#include <linux/if_arp.h>
89#include <linux/rtnetlink.h>
90#include <linux/times.h>
14c85021 91
457c4cbc 92#include <net/net_namespace.h>
14c85021 93#include <net/arp.h>
1da177e4
LT		 94#include <net/ip.h>
95#include <net/protocol.h>
96#include <net/route.h>
97#include <net/sock.h>
98#include <net/checksum.h>
99#include <linux/netfilter_ipv4.h>
100#ifdef CONFIG_IP_MROUTE
101#include <linux/mroute.h>
102#endif
103#ifdef CONFIG_PROC_FS
104#include <linux/proc_fs.h>
105#include <linux/seq_file.h>
106#endif
107
108#define IP_MAX_MEMBERSHIPS 20
109#define IP_MAX_MSF 10
110
111#ifdef CONFIG_IP_MULTICAST
112/* Parameter names and values are taken from igmp-v2-06 draft */
113
114#define IGMP_V1_Router_Present_Timeout (400*HZ)
115#define IGMP_V2_Router_Present_Timeout (400*HZ)
116#define IGMP_Unsolicited_Report_Interval (10*HZ)
117#define IGMP_Query_Response_Interval (10*HZ)
118#define IGMP_Unsolicited_Report_Count 2
119
120
121#define IGMP_Initial_Report_Delay (1)
122
123/* IGMP_Initial_Report_Delay is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
128 */
129
42f811b8 130#define IGMP_V1_SEEN(in_dev) \
c346dca1 131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
42f811b8
HX		 132 IN_DEV_CONF_GET((in_dev), 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) \
c346dca1 136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
42f811b8
HX		 137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
1da177e4
LT		 140
141static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
63007727 142static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
1da177e4
LT		 143static void igmpv3_clear_delrec(struct in_device *in_dev);
144static int sf_setstate(struct ip_mc_list *pmc);
145static void sf_markstate(struct ip_mc_list *pmc);
146#endif
147static void ip_mc_clear_src(struct ip_mc_list *pmc);
8f935bbd
AV		 148static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
149 int sfcount, __be32 *psfsrc, int delta);
1da177e4
LT		 150
151static void ip_ma_put(struct ip_mc_list *im)
152{
153 if (atomic_dec_and_test(&im->refcnt)) {
154 in_dev_put(im->interface);
155 kfree(im);
156 }
157}
158
159#ifdef CONFIG_IP_MULTICAST
160
161/*
162 * Timer management
163 */
164
165static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
166{
167 spin_lock_bh(&im->lock);
168 if (del_timer(&im->timer))
169 atomic_dec(&im->refcnt);
170 im->tm_running=0;
171 im->reporter = 0;
172 im->unsolicit_count = 0;
173 spin_unlock_bh(&im->lock);
174}
175
176/* It must be called with locked im->lock */
177static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
178{
179 int tv=net_random() % max_delay;
180
181 im->tm_running=1;
182 if (!mod_timer(&im->timer, jiffies+tv+2))
183 atomic_inc(&im->refcnt);
184}
185
186static void igmp_gq_start_timer(struct in_device *in_dev)
187{
188 int tv = net_random() % in_dev->mr_maxdelay;
189
190 in_dev->mr_gq_running = 1;
191 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
192 in_dev_hold(in_dev);
193}
194
195static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
196{
197 int tv = net_random() % delay;
198
199 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
200 in_dev_hold(in_dev);
201}
202
203static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
204{
205 spin_lock_bh(&im->lock);
206 im->unsolicit_count = 0;
207 if (del_timer(&im->timer)) {
208 if ((long)(im->timer.expires-jiffies) < max_delay) {
209 add_timer(&im->timer);
210 im->tm_running=1;
211 spin_unlock_bh(&im->lock);
212 return;
213 }
214 atomic_dec(&im->refcnt);
215 }
216 igmp_start_timer(im, max_delay);
217 spin_unlock_bh(&im->lock);
218}
219
220
221/*
222 * Send an IGMP report.
223 */
224
225#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
226
227
228static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
229 int gdeleted, int sdeleted)
230{
231 switch (type) {
232 case IGMPV3_MODE_IS_INCLUDE:
233 case IGMPV3_MODE_IS_EXCLUDE:
234 if (gdeleted || sdeleted)
235 return 0;
ad12583f
DS		 236 if (!(pmc->gsquery && !psf->sf_gsresp)) {
237 if (pmc->sfmode == MCAST_INCLUDE)
238 return 1;
239 /* don't include if this source is excluded
240 * in all filters
241 */
242 if (psf->sf_count[MCAST_INCLUDE])
243 return type == IGMPV3_MODE_IS_INCLUDE;
244 return pmc->sfcount[MCAST_EXCLUDE] ==
245 psf->sf_count[MCAST_EXCLUDE];
246 }
247 return 0;
1da177e4
LT		 248 case IGMPV3_CHANGE_TO_INCLUDE:
249 if (gdeleted || sdeleted)
250 return 0;
251 return psf->sf_count[MCAST_INCLUDE] != 0;
252 case IGMPV3_CHANGE_TO_EXCLUDE:
253 if (gdeleted || sdeleted)
254 return 0;
255 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
256 psf->sf_count[MCAST_INCLUDE])
257 return 0;
258 return pmc->sfcount[MCAST_EXCLUDE] ==
259 psf->sf_count[MCAST_EXCLUDE];
260 case IGMPV3_ALLOW_NEW_SOURCES:
261 if (gdeleted || !psf->sf_crcount)
262 return 0;
263 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
264 case IGMPV3_BLOCK_OLD_SOURCES:
265 if (pmc->sfmode == MCAST_INCLUDE)
266 return gdeleted || (psf->sf_crcount && sdeleted);
267 return psf->sf_crcount && !gdeleted && !sdeleted;
268 }
269 return 0;
270}
271
272static int
273igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
274{
275 struct ip_sf_list *psf;
276 int scount = 0;
277
278 for (psf=pmc->sources; psf; psf=psf->sf_next) {
279 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
280 continue;
281 scount++;
282 }
283 return scount;
284}
285
286static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
287{
288 struct sk_buff *skb;
289 struct rtable *rt;
290 struct iphdr *pip;
291 struct igmpv3_report *pig;
292
f5184d26 293 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
1da177e4
LT		 294 if (skb == NULL)
295 return NULL;
296
297 {
298 struct flowi fl = { .oif = dev->ifindex,
299 .nl_u = { .ip4_u = {
300 .daddr = IGMPV3_ALL_MCR } },
301 .proto = IPPROTO_IGMP };
f206351a 302 if (ip_route_output_key(&init_net, &rt, &fl)) {
1da177e4
LT		 303 kfree_skb(skb);
304 return NULL;
305 }
306 }
307 if (rt->rt_src == 0) {
308 kfree_skb(skb);
309 ip_rt_put(rt);
310 return NULL;
311 }
312
313 skb->dst = &rt->u.dst;
314 skb->dev = dev;
315
316 skb_reserve(skb, LL_RESERVED_SPACE(dev));
317
7e28ecc2 318 skb_reset_network_header(skb);
eddc9ec5 319 pip = ip_hdr(skb);
7e28ecc2 320 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 321
322 pip->version = 4;
323 pip->ihl = (sizeof(struct iphdr)+4)>>2;
324 pip->tos = 0xc0;
325 pip->frag_off = htons(IP_DF);
326 pip->ttl = 1;
327 pip->daddr = rt->rt_dst;
328 pip->saddr = rt->rt_src;
329 pip->protocol = IPPROTO_IGMP;
330 pip->tot_len = 0; /* filled in later */
331 ip_select_ident(pip, &rt->u.dst, NULL);
332 ((u8*)&pip[1])[0] = IPOPT_RA;
333 ((u8*)&pip[1])[1] = 4;
334 ((u8*)&pip[1])[2] = 0;
335 ((u8*)&pip[1])[3] = 0;
336
b0e380b1 337 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
d10ba34b 338 skb_put(skb, sizeof(*pig));
d9edf9e2 339 pig = igmpv3_report_hdr(skb);
1da177e4
LT		 340 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
341 pig->resv1 = 0;
342 pig->csum = 0;
343 pig->resv2 = 0;
344 pig->ngrec = 0;
345 return skb;
346}
347
348static int igmpv3_sendpack(struct sk_buff *skb)
349{
d9edf9e2 350 struct igmphdr *pig = igmp_hdr(skb);
27a884dc 351 const int igmplen = skb->tail - skb->transport_header;
1da177e4 352
d9edf9e2 353 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
1da177e4 354
c439cb2e 355 return ip_local_out(skb);
1da177e4
LT		 356}
357
358static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
359{
360 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
361}
362
363static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
364 int type, struct igmpv3_grec **ppgr)
365{
366 struct net_device *dev = pmc->interface->dev;
367 struct igmpv3_report *pih;
368 struct igmpv3_grec *pgr;
369
370 if (!skb)
371 skb = igmpv3_newpack(dev, dev->mtu);
372 if (!skb)
373 return NULL;
374 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
375 pgr->grec_type = type;
376 pgr->grec_auxwords = 0;
377 pgr->grec_nsrcs = 0;
378 pgr->grec_mca = pmc->multiaddr;
d9edf9e2 379 pih = igmpv3_report_hdr(skb);
1da177e4
LT		 380 pih->ngrec = htons(ntohs(pih->ngrec)+1);
381 *ppgr = pgr;
382 return skb;
383}
384
385#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
386 skb_tailroom(skb)) : 0)
387
388static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
389 int type, int gdeleted, int sdeleted)
390{
391 struct net_device *dev = pmc->interface->dev;
392 struct igmpv3_report *pih;
393 struct igmpv3_grec *pgr = NULL;
394 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
ad12583f 395 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 396
397 if (pmc->multiaddr == IGMP_ALL_HOSTS)
398 return skb;
399
400 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
401 type == IGMPV3_MODE_IS_EXCLUDE;
402 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
403 type == IGMPV3_CHANGE_TO_EXCLUDE;
404
ad12583f
DS		 405 stotal = scount = 0;
406
1da177e4
LT		 407 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
408
ad12583f
DS		 409 if (!*psf_list)
410 goto empty_source;
411
d9edf9e2 412 pih = skb ? igmpv3_report_hdr(skb) : NULL;
1da177e4
LT		 413
414 /* EX and TO_EX get a fresh packet, if needed */
415 if (truncate) {
416 if (pih && pih->ngrec &&
417 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
418 if (skb)
419 igmpv3_sendpack(skb);
420 skb = igmpv3_newpack(dev, dev->mtu);
421 }
422 }
423 first = 1;
1da177e4
LT		 424 psf_prev = NULL;
425 for (psf=*psf_list; psf; psf=psf_next) {
ea4d9e72 426 __be32 *psrc;
1da177e4
LT		 427
428 psf_next = psf->sf_next;
429
430 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
431 psf_prev = psf;
432 continue;
433 }
434
435 /* clear marks on query responses */
436 if (isquery)
437 psf->sf_gsresp = 0;
438
63007727 439 if (AVAILABLE(skb) < sizeof(__be32) +
1da177e4
LT		 440 first*sizeof(struct igmpv3_grec)) {
441 if (truncate && !first)
442 break; /* truncate these */
443 if (pgr)
444 pgr->grec_nsrcs = htons(scount);
445 if (skb)
446 igmpv3_sendpack(skb);
447 skb = igmpv3_newpack(dev, dev->mtu);
448 first = 1;
449 scount = 0;
450 }
451 if (first) {
452 skb = add_grhead(skb, pmc, type, &pgr);
453 first = 0;
454 }
cc63f70b
AD		 455 if (!skb)
456 return NULL;
63007727 457 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
1da177e4 458 *psrc = psf->sf_inaddr;
ad12583f 459 scount++; stotal++;
1da177e4
LT		 460 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
461 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
462 psf->sf_crcount--;
463 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
464 if (psf_prev)
465 psf_prev->sf_next = psf->sf_next;
466 else
467 *psf_list = psf->sf_next;
468 kfree(psf);
469 continue;
470 }
471 }
472 psf_prev = psf;
473 }
ad12583f
DS		 474
475empty_source:
476 if (!stotal) {
477 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
478 type == IGMPV3_BLOCK_OLD_SOURCES)
479 return skb;
480 if (pmc->crcount || isquery) {
481 /* make sure we have room for group header */
482 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
483 igmpv3_sendpack(skb);
484 skb = NULL; /* add_grhead will get a new one */
485 }
486 skb = add_grhead(skb, pmc, type, &pgr);
487 }
488 }
1da177e4
LT		 489 if (pgr)
490 pgr->grec_nsrcs = htons(scount);
491
492 if (isquery)
493 pmc->gsquery = 0; /* clear query state on report */
494 return skb;
495}
496
497static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
498{
499 struct sk_buff *skb = NULL;
500 int type;
501
502 if (!pmc) {
503 read_lock(&in_dev->mc_list_lock);
504 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
505 if (pmc->multiaddr == IGMP_ALL_HOSTS)
506 continue;
507 spin_lock_bh(&pmc->lock);
508 if (pmc->sfcount[MCAST_EXCLUDE])
509 type = IGMPV3_MODE_IS_EXCLUDE;
510 else
511 type = IGMPV3_MODE_IS_INCLUDE;
512 skb = add_grec(skb, pmc, type, 0, 0);
513 spin_unlock_bh(&pmc->lock);
514 }
515 read_unlock(&in_dev->mc_list_lock);
516 } else {
517 spin_lock_bh(&pmc->lock);
518 if (pmc->sfcount[MCAST_EXCLUDE])
519 type = IGMPV3_MODE_IS_EXCLUDE;
520 else
521 type = IGMPV3_MODE_IS_INCLUDE;
522 skb = add_grec(skb, pmc, type, 0, 0);
523 spin_unlock_bh(&pmc->lock);
524 }
525 if (!skb)
526 return 0;
527 return igmpv3_sendpack(skb);
528}
529
530/*
531 * remove zero-count source records from a source filter list
532 */
533static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
534{
535 struct ip_sf_list *psf_prev, *psf_next, *psf;
536
537 psf_prev = NULL;
538 for (psf=*ppsf; psf; psf = psf_next) {
539 psf_next = psf->sf_next;
540 if (psf->sf_crcount == 0) {
541 if (psf_prev)
542 psf_prev->sf_next = psf->sf_next;
543 else
544 *ppsf = psf->sf_next;
545 kfree(psf);
546 } else
547 psf_prev = psf;
548 }
549}
550
551static void igmpv3_send_cr(struct in_device *in_dev)
552{
553 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
554 struct sk_buff *skb = NULL;
555 int type, dtype;
556
557 read_lock(&in_dev->mc_list_lock);
558 spin_lock_bh(&in_dev->mc_tomb_lock);
559
560 /* deleted MCA's */
561 pmc_prev = NULL;
562 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
563 pmc_next = pmc->next;
564 if (pmc->sfmode == MCAST_INCLUDE) {
565 type = IGMPV3_BLOCK_OLD_SOURCES;
566 dtype = IGMPV3_BLOCK_OLD_SOURCES;
567 skb = add_grec(skb, pmc, type, 1, 0);
568 skb = add_grec(skb, pmc, dtype, 1, 1);
569 }
570 if (pmc->crcount) {
1da177e4
LT		 571 if (pmc->sfmode == MCAST_EXCLUDE) {
572 type = IGMPV3_CHANGE_TO_INCLUDE;
573 skb = add_grec(skb, pmc, type, 1, 0);
574 }
ad12583f 575 pmc->crcount--;
1da177e4
LT		 576 if (pmc->crcount == 0) {
577 igmpv3_clear_zeros(&pmc->tomb);
578 igmpv3_clear_zeros(&pmc->sources);
579 }
580 }
581 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
582 if (pmc_prev)
583 pmc_prev->next = pmc_next;
584 else
585 in_dev->mc_tomb = pmc_next;
586 in_dev_put(pmc->interface);
587 kfree(pmc);
588 } else
589 pmc_prev = pmc;
590 }
591 spin_unlock_bh(&in_dev->mc_tomb_lock);
592
593 /* change recs */
594 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
595 spin_lock_bh(&pmc->lock);
596 if (pmc->sfcount[MCAST_EXCLUDE]) {
597 type = IGMPV3_BLOCK_OLD_SOURCES;
598 dtype = IGMPV3_ALLOW_NEW_SOURCES;
599 } else {
600 type = IGMPV3_ALLOW_NEW_SOURCES;
601 dtype = IGMPV3_BLOCK_OLD_SOURCES;
602 }
603 skb = add_grec(skb, pmc, type, 0, 0);
604 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
605
606 /* filter mode changes */
607 if (pmc->crcount) {
1da177e4
LT		 608 if (pmc->sfmode == MCAST_EXCLUDE)
609 type = IGMPV3_CHANGE_TO_EXCLUDE;
610 else
611 type = IGMPV3_CHANGE_TO_INCLUDE;
612 skb = add_grec(skb, pmc, type, 0, 0);
ad12583f 613 pmc->crcount--;
1da177e4
LT		 614 }
615 spin_unlock_bh(&pmc->lock);
616 }
617 read_unlock(&in_dev->mc_list_lock);
618
619 if (!skb)
620 return;
621 (void) igmpv3_sendpack(skb);
622}
623
624static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
625 int type)
626{
627 struct sk_buff *skb;
628 struct iphdr *iph;
629 struct igmphdr *ih;
630 struct rtable *rt;
631 struct net_device *dev = in_dev->dev;
63007727
AV		 632 __be32 group = pmc ? pmc->multiaddr : 0;
633 __be32 dst;
1da177e4
LT		 634
635 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
636 return igmpv3_send_report(in_dev, pmc);
637 else if (type == IGMP_HOST_LEAVE_MESSAGE)
638 dst = IGMP_ALL_ROUTER;
639 else
640 dst = group;
641
642 {
643 struct flowi fl = { .oif = dev->ifindex,
644 .nl_u = { .ip4_u = { .daddr = dst } },
645 .proto = IPPROTO_IGMP };
f206351a 646 if (ip_route_output_key(&init_net, &rt, &fl))
1da177e4
LT		 647 return -1;
648 }
649 if (rt->rt_src == 0) {
650 ip_rt_put(rt);
651 return -1;
652 }
653
f5184d26 654 skb=alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
1da177e4
LT		 655 if (skb == NULL) {
656 ip_rt_put(rt);
657 return -1;
658 }
659
660 skb->dst = &rt->u.dst;
661
662 skb_reserve(skb, LL_RESERVED_SPACE(dev));
663
7e28ecc2 664 skb_reset_network_header(skb);
eddc9ec5 665 iph = ip_hdr(skb);
7e28ecc2 666 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 667
668 iph->version = 4;
669 iph->ihl = (sizeof(struct iphdr)+4)>>2;
670 iph->tos = 0xc0;
671 iph->frag_off = htons(IP_DF);
672 iph->ttl = 1;
673 iph->daddr = dst;
674 iph->saddr = rt->rt_src;
675 iph->protocol = IPPROTO_IGMP;
1da177e4
LT		 676 ip_select_ident(iph, &rt->u.dst, NULL);
677 ((u8*)&iph[1])[0] = IPOPT_RA;
678 ((u8*)&iph[1])[1] = 4;
679 ((u8*)&iph[1])[2] = 0;
680 ((u8*)&iph[1])[3] = 0;
1da177e4
LT		 681
682 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
683 ih->type=type;
684 ih->code=0;
685 ih->csum=0;
686 ih->group=group;
687 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
688
c439cb2e 689 return ip_local_out(skb);
1da177e4
LT		 690}
691
692static void igmp_gq_timer_expire(unsigned long data)
693{
694 struct in_device *in_dev = (struct in_device *)data;
695
696 in_dev->mr_gq_running = 0;
697 igmpv3_send_report(in_dev, NULL);
698 __in_dev_put(in_dev);
699}
700
701static void igmp_ifc_timer_expire(unsigned long data)
702{
703 struct in_device *in_dev = (struct in_device *)data;
704
705 igmpv3_send_cr(in_dev);
706 if (in_dev->mr_ifc_count) {
707 in_dev->mr_ifc_count--;
708 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
709 }
710 __in_dev_put(in_dev);
711}
712
713static void igmp_ifc_event(struct in_device *in_dev)
714{
715 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
716 return;
e905a9ed 717 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 718 IGMP_Unsolicited_Report_Count;
719 igmp_ifc_start_timer(in_dev, 1);
720}
721
722
723static void igmp_timer_expire(unsigned long data)
724{
725 struct ip_mc_list *im=(struct ip_mc_list *)data;
726 struct in_device *in_dev = im->interface;
727
728 spin_lock(&im->lock);
729 im->tm_running=0;
730
731 if (im->unsolicit_count) {
732 im->unsolicit_count--;
733 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
734 }
735 im->reporter = 1;
736 spin_unlock(&im->lock);
737
738 if (IGMP_V1_SEEN(in_dev))
739 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
740 else if (IGMP_V2_SEEN(in_dev))
741 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
742 else
743 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
744
745 ip_ma_put(im);
746}
747
ad12583f 748/* mark EXCLUDE-mode sources */
ea4d9e72 749static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 750{
751 struct ip_sf_list *psf;
752 int i, scount;
753
ad12583f
DS		 754 scount = 0;
755 for (psf=pmc->sources; psf; psf=psf->sf_next) {
756 if (scount == nsrcs)
757 break;
758 for (i=0; i<nsrcs; i++) {
759 /* skip inactive filters */
760 if (pmc->sfcount[MCAST_INCLUDE] ||
761 pmc->sfcount[MCAST_EXCLUDE] !=
762 psf->sf_count[MCAST_EXCLUDE])
763 continue;
764 if (srcs[i] == psf->sf_inaddr) {
765 scount++;
766 break;
767 }
768 }
769 }
770 pmc->gsquery = 0;
771 if (scount == nsrcs) /* all sources excluded */
772 return 0;
773 return 1;
774}
775
ea4d9e72 776static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 777{
778 struct ip_sf_list *psf;
779 int i, scount;
780
781 if (pmc->sfmode == MCAST_EXCLUDE)
782 return igmp_xmarksources(pmc, nsrcs, srcs);
783
784 /* mark INCLUDE-mode sources */
1da177e4
LT		 785 scount = 0;
786 for (psf=pmc->sources; psf; psf=psf->sf_next) {
787 if (scount == nsrcs)
788 break;
789 for (i=0; i<nsrcs; i++)
790 if (srcs[i] == psf->sf_inaddr) {
791 psf->sf_gsresp = 1;
792 scount++;
793 break;
794 }
795 }
ad12583f
DS		 796 if (!scount) {
797 pmc->gsquery = 0;
798 return 0;
799 }
800 pmc->gsquery = 1;
801 return 1;
1da177e4
LT		 802}
803
63007727 804static void igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 805{
806 struct ip_mc_list *im;
807
808 /* Timers are only set for non-local groups */
809
810 if (group == IGMP_ALL_HOSTS)
811 return;
812
813 read_lock(&in_dev->mc_list_lock);
814 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
815 if (im->multiaddr == group) {
816 igmp_stop_timer(im);
817 break;
818 }
819 }
820 read_unlock(&in_dev->mc_list_lock);
821}
822
823static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
824 int len)
825{
d9edf9e2
ACM		 826 struct igmphdr *ih = igmp_hdr(skb);
827 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
1da177e4 828 struct ip_mc_list *im;
63007727 829 __be32 group = ih->group;
1da177e4
LT		 830 int max_delay;
831 int mark = 0;
832
833
834 if (len == 8) {
835 if (ih->code == 0) {
836 /* Alas, old v1 router presents here. */
e905a9ed 837
1da177e4
LT		 838 max_delay = IGMP_Query_Response_Interval;
839 in_dev->mr_v1_seen = jiffies +
840 IGMP_V1_Router_Present_Timeout;
841 group = 0;
842 } else {
843 /* v2 router present */
844 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
845 in_dev->mr_v2_seen = jiffies +
846 IGMP_V2_Router_Present_Timeout;
847 }
848 /* cancel the interface change timer */
849 in_dev->mr_ifc_count = 0;
850 if (del_timer(&in_dev->mr_ifc_timer))
851 __in_dev_put(in_dev);
852 /* clear deleted report items */
853 igmpv3_clear_delrec(in_dev);
854 } else if (len < 12) {
855 return; /* ignore bogus packet; freed by caller */
856 } else { /* v3 */
857 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
858 return;
e905a9ed 859
d9edf9e2 860 ih3 = igmpv3_query_hdr(skb);
1da177e4 861 if (ih3->nsrcs) {
e905a9ed 862 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 863 + ntohs(ih3->nsrcs)*sizeof(__be32)))
1da177e4 864 return;
d9edf9e2 865 ih3 = igmpv3_query_hdr(skb);
1da177e4
LT		 866 }
867
868 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
869 if (!max_delay)
870 max_delay = 1; /* can't mod w/ 0 */
871 in_dev->mr_maxdelay = max_delay;
872 if (ih3->qrv)
873 in_dev->mr_qrv = ih3->qrv;
874 if (!group) { /* general query */
875 if (ih3->nsrcs)
876 return; /* no sources allowed */
877 igmp_gq_start_timer(in_dev);
878 return;
879 }
880 /* mark sources to include, if group & source-specific */
881 mark = ih3->nsrcs != 0;
882 }
883
884 /*
885 * - Start the timers in all of our membership records
886 * that the query applies to for the interface on
887 * which the query arrived excl. those that belong
888 * to a "local" group (224.0.0.X)
889 * - For timers already running check if they need to
890 * be reset.
891 * - Use the igmp->igmp_code field as the maximum
892 * delay possible
893 */
894 read_lock(&in_dev->mc_list_lock);
895 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
ad12583f
DS		 896 int changed;
897
1da177e4
LT		 898 if (group && group != im->multiaddr)
899 continue;
900 if (im->multiaddr == IGMP_ALL_HOSTS)
901 continue;
902 spin_lock_bh(&im->lock);
903 if (im->tm_running)
904 im->gsquery = im->gsquery && mark;
905 else
906 im->gsquery = mark;
ad12583f 907 changed = !im->gsquery ||
e905a9ed 908 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 909 spin_unlock_bh(&im->lock);
ad12583f
DS		 910 if (changed)
911 igmp_mod_timer(im, max_delay);
1da177e4
LT		 912 }
913 read_unlock(&in_dev->mc_list_lock);
914}
915
916int igmp_rcv(struct sk_buff *skb)
917{
918 /* This basically follows the spec line by line -- see RFC1112 */
919 struct igmphdr *ih;
920 struct in_device *in_dev = in_dev_get(skb->dev);
921 int len = skb->len;
922
cd557bc1
DL		 923 if (in_dev == NULL)
924 goto drop;
1da177e4 925
fb286bb2 926 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
cd557bc1 927 goto drop_ref;
fb286bb2
HX		 928
929 switch (skb->ip_summed) {
84fa7933 930 case CHECKSUM_COMPLETE:
d3bc23e7 931 if (!csum_fold(skb->csum))
fb286bb2
HX		 932 break;
933 /* fall through */
934 case CHECKSUM_NONE:
935 skb->csum = 0;
936 if (__skb_checksum_complete(skb))
cd557bc1 937 goto drop_ref;
1da177e4
LT		 938 }
939
d9edf9e2 940 ih = igmp_hdr(skb);
1da177e4
LT		 941 switch (ih->type) {
942 case IGMP_HOST_MEMBERSHIP_QUERY:
943 igmp_heard_query(in_dev, skb, len);
944 break;
945 case IGMP_HOST_MEMBERSHIP_REPORT:
946 case IGMPV2_HOST_MEMBERSHIP_REPORT:
947 case IGMPV3_HOST_MEMBERSHIP_REPORT:
948 /* Is it our report looped back? */
ee6b9673 949 if (skb->rtable->fl.iif == 0)
1da177e4 950 break;
24c69275
DS		 951 /* don't rely on MC router hearing unicast reports */
952 if (skb->pkt_type == PACKET_MULTICAST ||
953 skb->pkt_type == PACKET_BROADCAST)
954 igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 955 break;
956 case IGMP_PIM:
957#ifdef CONFIG_IP_PIMSM_V1
958 in_dev_put(in_dev);
959 return pim_rcv_v1(skb);
960#endif
961 case IGMP_DVMRP:
962 case IGMP_TRACE:
963 case IGMP_HOST_LEAVE_MESSAGE:
964 case IGMP_MTRACE:
965 case IGMP_MTRACE_RESP:
966 break;
967 default:
dd1c1853 968 break;
1da177e4 969 }
fb286bb2 970
cd557bc1 971drop_ref:
1da177e4 972 in_dev_put(in_dev);
cd557bc1 973drop:
1da177e4
LT		 974 kfree_skb(skb);
975 return 0;
976}
977
978#endif
979
980
981/*
982 * Add a filter to a device
983 */
984
63007727 985static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 986{
987 char buf[MAX_ADDR_LEN];
988 struct net_device *dev = in_dev->dev;
989
990 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
991 We will get multicast token leakage, when IFF_MULTICAST
992 is changed. This check should be done in dev->set_multicast_list
993 routine. Something sort of:
994 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
995 --ANK
996 */
997 if (arp_mc_map(addr, buf, dev, 0) == 0)
998 dev_mc_add(dev,buf,dev->addr_len,0);
999}
1000
1001/*
1002 * Remove a filter from a device
1003 */
1004
63007727 1005static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1006{
1007 char buf[MAX_ADDR_LEN];
1008 struct net_device *dev = in_dev->dev;
1009
1010 if (arp_mc_map(addr, buf, dev, 0) == 0)
1011 dev_mc_delete(dev,buf,dev->addr_len,0);
1012}
1013
1014#ifdef CONFIG_IP_MULTICAST
1015/*
1016 * deleted ip_mc_list manipulation
1017 */
1018static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1019{
1020 struct ip_mc_list *pmc;
1021
1022 /* this is an "ip_mc_list" for convenience; only the fields below
1023 * are actually used. In particular, the refcnt and users are not
1024 * used for management of the delete list. Using the same structure
1025 * for deleted items allows change reports to use common code with
1026 * non-deleted or query-response MCA's.
1027 */
0da974f4 1028 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1029 if (!pmc)
1030 return;
1da177e4
LT		 1031 spin_lock_bh(&im->lock);
1032 pmc->interface = im->interface;
1033 in_dev_hold(in_dev);
1034 pmc->multiaddr = im->multiaddr;
1035 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1036 IGMP_Unsolicited_Report_Count;
1037 pmc->sfmode = im->sfmode;
1038 if (pmc->sfmode == MCAST_INCLUDE) {
1039 struct ip_sf_list *psf;
1040
1041 pmc->tomb = im->tomb;
1042 pmc->sources = im->sources;
1043 im->tomb = im->sources = NULL;
1044 for (psf=pmc->sources; psf; psf=psf->sf_next)
1045 psf->sf_crcount = pmc->crcount;
1046 }
1047 spin_unlock_bh(&im->lock);
1048
1049 spin_lock_bh(&in_dev->mc_tomb_lock);
1050 pmc->next = in_dev->mc_tomb;
1051 in_dev->mc_tomb = pmc;
1052 spin_unlock_bh(&in_dev->mc_tomb_lock);
1053}
1054
63007727 1055static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1056{
1057 struct ip_mc_list *pmc, *pmc_prev;
1058 struct ip_sf_list *psf, *psf_next;
1059
1060 spin_lock_bh(&in_dev->mc_tomb_lock);
1061 pmc_prev = NULL;
1062 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1063 if (pmc->multiaddr == multiaddr)
1064 break;
1065 pmc_prev = pmc;
1066 }
1067 if (pmc) {
1068 if (pmc_prev)
1069 pmc_prev->next = pmc->next;
1070 else
1071 in_dev->mc_tomb = pmc->next;
1072 }
1073 spin_unlock_bh(&in_dev->mc_tomb_lock);
1074 if (pmc) {
1075 for (psf=pmc->tomb; psf; psf=psf_next) {
1076 psf_next = psf->sf_next;
1077 kfree(psf);
1078 }
1079 in_dev_put(pmc->interface);
1080 kfree(pmc);
1081 }
1082}
1083
1084static void igmpv3_clear_delrec(struct in_device *in_dev)
1085{
1086 struct ip_mc_list *pmc, *nextpmc;
1087
1088 spin_lock_bh(&in_dev->mc_tomb_lock);
1089 pmc = in_dev->mc_tomb;
1090 in_dev->mc_tomb = NULL;
1091 spin_unlock_bh(&in_dev->mc_tomb_lock);
1092
1093 for (; pmc; pmc = nextpmc) {
1094 nextpmc = pmc->next;
1095 ip_mc_clear_src(pmc);
1096 in_dev_put(pmc->interface);
1097 kfree(pmc);
1098 }
1099 /* clear dead sources, too */
1100 read_lock(&in_dev->mc_list_lock);
1101 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1102 struct ip_sf_list *psf, *psf_next;
1103
1104 spin_lock_bh(&pmc->lock);
1105 psf = pmc->tomb;
1106 pmc->tomb = NULL;
1107 spin_unlock_bh(&pmc->lock);
1108 for (; psf; psf=psf_next) {
1109 psf_next = psf->sf_next;
1110 kfree(psf);
1111 }
1112 }
1113 read_unlock(&in_dev->mc_list_lock);
1114}
1115#endif
1116
1117static void igmp_group_dropped(struct ip_mc_list *im)
1118{
1119 struct in_device *in_dev = im->interface;
1120#ifdef CONFIG_IP_MULTICAST
1121 int reporter;
1122#endif
1123
1124 if (im->loaded) {
1125 im->loaded = 0;
1126 ip_mc_filter_del(in_dev, im->multiaddr);
1127 }
1128
1129#ifdef CONFIG_IP_MULTICAST
1130 if (im->multiaddr == IGMP_ALL_HOSTS)
1131 return;
1132
1133 reporter = im->reporter;
1134 igmp_stop_timer(im);
1135
1136 if (!in_dev->dead) {
1137 if (IGMP_V1_SEEN(in_dev))
1138 goto done;
1139 if (IGMP_V2_SEEN(in_dev)) {
1140 if (reporter)
1141 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1142 goto done;
1143 }
1144 /* IGMPv3 */
1145 igmpv3_add_delrec(in_dev, im);
1146
1147 igmp_ifc_event(in_dev);
1148 }
1149done:
1150#endif
1151 ip_mc_clear_src(im);
1152}
1153
1154static void igmp_group_added(struct ip_mc_list *im)
1155{
1156 struct in_device *in_dev = im->interface;
1157
1158 if (im->loaded == 0) {
1159 im->loaded = 1;
1160 ip_mc_filter_add(in_dev, im->multiaddr);
1161 }
1162
1163#ifdef CONFIG_IP_MULTICAST
1164 if (im->multiaddr == IGMP_ALL_HOSTS)
1165 return;
1166
1167 if (in_dev->dead)
1168 return;
1169 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1170 spin_lock_bh(&im->lock);
1171 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1172 spin_unlock_bh(&im->lock);
1173 return;
1174 }
1175 /* else, v3 */
1176
1177 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1178 IGMP_Unsolicited_Report_Count;
1179 igmp_ifc_event(in_dev);
1180#endif
1181}
1182
1183
1184/*
1185 * Multicast list managers
1186 */
1187
1188
1189/*
1190 * A socket has joined a multicast group on device dev.
1191 */
1192
8f935bbd 1193void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1194{
1195 struct ip_mc_list *im;
1196
1197 ASSERT_RTNL();
1198
721499e8 1199 if (!net_eq(dev_net(in_dev->dev), &init_net))
2430aa85
DL		 1200 return;
1201
1da177e4
LT		 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
721499e8 1281 if (!net_eq(dev_net(in_dev->dev), &init_net))
2430aa85
DL		 1282 return;
1283
1da177e4
LT		 1284 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1285 if (i->multiaddr==addr) {
1286 if (--i->users == 0) {
1287 write_lock_bh(&in_dev->mc_list_lock);
1288 *ip = i->next;
1289 write_unlock_bh(&in_dev->mc_list_lock);
1290 igmp_group_dropped(i);
1291
1292 if (!in_dev->dead)
1293 ip_rt_multicast_event(in_dev);
1294
1295 ip_ma_put(i);
1296 return;
1297 }
1298 break;
1299 }
1300 }
1301}
1302
1303/* Device going down */
1304
1305void ip_mc_down(struct in_device *in_dev)
1306{
1307 struct ip_mc_list *i;
1308
1309 ASSERT_RTNL();
1310
721499e8 1311 if (!net_eq(dev_net(in_dev->dev), &init_net))
2430aa85
DL		 1312 return;
1313
1da177e4
LT		 1314 for (i=in_dev->mc_list; i; i=i->next)
1315 igmp_group_dropped(i);
1316
1317#ifdef CONFIG_IP_MULTICAST
1318 in_dev->mr_ifc_count = 0;
1319 if (del_timer(&in_dev->mr_ifc_timer))
1320 __in_dev_put(in_dev);
1321 in_dev->mr_gq_running = 0;
1322 if (del_timer(&in_dev->mr_gq_timer))
1323 __in_dev_put(in_dev);
1324 igmpv3_clear_delrec(in_dev);
1325#endif
1326
1327 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1328}
1329
1330void ip_mc_init_dev(struct in_device *in_dev)
1331{
1332 ASSERT_RTNL();
1333
721499e8 1334 if (!net_eq(dev_net(in_dev->dev), &init_net))
2430aa85
DL		 1335 return;
1336
1da177e4
LT		 1337 in_dev->mc_tomb = NULL;
1338#ifdef CONFIG_IP_MULTICAST
1339 in_dev->mr_gq_running = 0;
b24b8a24
PE		 1340 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1341 (unsigned long)in_dev);
1da177e4 1342 in_dev->mr_ifc_count = 0;
b24b8a24
PE		 1343 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1344 (unsigned long)in_dev);
1da177e4
LT		 1345 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1346#endif
1347
1348 rwlock_init(&in_dev->mc_list_lock);
1349 spin_lock_init(&in_dev->mc_tomb_lock);
1350}
1351
1352/* Device going up */
1353
1354void ip_mc_up(struct in_device *in_dev)
1355{
1356 struct ip_mc_list *i;
1357
1358 ASSERT_RTNL();
1359
721499e8 1360 if (!net_eq(dev_net(in_dev->dev), &init_net))
2430aa85
DL		 1361 return;
1362
1da177e4
LT		 1363 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1364
1365 for (i=in_dev->mc_list; i; i=i->next)
1366 igmp_group_added(i);
1367}
1368
1369/*
1370 * Device is about to be destroyed: clean up.
1371 */
1372
1373void ip_mc_destroy_dev(struct in_device *in_dev)
1374{
1375 struct ip_mc_list *i;
1376
1377 ASSERT_RTNL();
1378
721499e8 1379 if (!net_eq(dev_net(in_dev->dev), &init_net))
2430aa85
DL		 1380 return;
1381
1da177e4
LT		 1382 /* Deactivate timers */
1383 ip_mc_down(in_dev);
1384
1385 write_lock_bh(&in_dev->mc_list_lock);
1386 while ((i = in_dev->mc_list) != NULL) {
1387 in_dev->mc_list = i->next;
1388 write_unlock_bh(&in_dev->mc_list_lock);
1389
1390 igmp_group_dropped(i);
1391 ip_ma_put(i);
1392
1393 write_lock_bh(&in_dev->mc_list_lock);
1394 }
1395 write_unlock_bh(&in_dev->mc_list_lock);
1396}
1397
1398static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1399{
1400 struct flowi fl = { .nl_u = { .ip4_u =
1401 { .daddr = imr->imr_multiaddr.s_addr } } };
1402 struct rtable *rt;
1403 struct net_device *dev = NULL;
1404 struct in_device *idev = NULL;
1405
1406 if (imr->imr_ifindex) {
7fee0ca2 1407 idev = inetdev_by_index(&init_net, imr->imr_ifindex);
1da177e4
LT		 1408 if (idev)
1409 __in_dev_put(idev);
1410 return idev;
1411 }
1412 if (imr->imr_address.s_addr) {
1ab35276 1413 dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
1da177e4
LT		 1414 if (!dev)
1415 return NULL;
15333061 1416 dev_put(dev);
1da177e4
LT		 1417 }
1418
f206351a 1419 if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) {
1da177e4
LT		 1420 dev = rt->u.dst.dev;
1421 ip_rt_put(rt);
1422 }
1423 if (dev) {
1424 imr->imr_ifindex = dev->ifindex;
e5ed6399 1425 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1426 }
1427 return idev;
1428}
1429
1430/*
1431 * Join a socket to a group
1432 */
ab32ea5d
BH		 1433int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1434int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1da177e4
LT		 1435
1436
1437static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1438 __be32 *psfsrc)
1da177e4
LT		 1439{
1440 struct ip_sf_list *psf, *psf_prev;
1441 int rv = 0;
1442
1443 psf_prev = NULL;
1444 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1445 if (psf->sf_inaddr == *psfsrc)
1446 break;
1447 psf_prev = psf;
1448 }
1449 if (!psf || psf->sf_count[sfmode] == 0) {
1450 /* source filter not found, or count wrong => bug */
1451 return -ESRCH;
1452 }
1453 psf->sf_count[sfmode]--;
1454 if (psf->sf_count[sfmode] == 0) {
1455 ip_rt_multicast_event(pmc->interface);
1456 }
1457 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1458#ifdef CONFIG_IP_MULTICAST
1459 struct in_device *in_dev = pmc->interface;
1460#endif
1461
1462 /* no more filters for this source */
1463 if (psf_prev)
1464 psf_prev->sf_next = psf->sf_next;
1465 else
1466 pmc->sources = psf->sf_next;
1467#ifdef CONFIG_IP_MULTICAST
1468 if (psf->sf_oldin &&
1469 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
e905a9ed 1470 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1471 IGMP_Unsolicited_Report_Count;
1472 psf->sf_next = pmc->tomb;
1473 pmc->tomb = psf;
1474 rv = 1;
1475 } else
1476#endif
1477 kfree(psf);
1478 }
1479 return rv;
1480}
1481
1482#ifndef CONFIG_IP_MULTICAST
1483#define igmp_ifc_event(x) do { } while (0)
1484#endif
1485
8f935bbd
AV		 1486static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1487 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1488{
1489 struct ip_mc_list *pmc;
1490 int changerec = 0;
1491 int i, err;
1492
1493 if (!in_dev)
1494 return -ENODEV;
1495 read_lock(&in_dev->mc_list_lock);
1496 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1497 if (*pmca == pmc->multiaddr)
1498 break;
1499 }
1500 if (!pmc) {
1501 /* MCA not found?? bug */
1502 read_unlock(&in_dev->mc_list_lock);
1503 return -ESRCH;
1504 }
1505 spin_lock_bh(&pmc->lock);
1506 read_unlock(&in_dev->mc_list_lock);
1507#ifdef CONFIG_IP_MULTICAST
1508 sf_markstate(pmc);
1509#endif
1510 if (!delta) {
1511 err = -EINVAL;
1512 if (!pmc->sfcount[sfmode])
1513 goto out_unlock;
1514 pmc->sfcount[sfmode]--;
1515 }
1516 err = 0;
1517 for (i=0; i<sfcount; i++) {
1518 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1519
1520 changerec |= rv > 0;
1521 if (!err && rv < 0)
1522 err = rv;
1523 }
1524 if (pmc->sfmode == MCAST_EXCLUDE &&
1525 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1526 pmc->sfcount[MCAST_INCLUDE]) {
1527#ifdef CONFIG_IP_MULTICAST
1528 struct ip_sf_list *psf;
1529#endif
1530
1531 /* filter mode change */
1532 pmc->sfmode = MCAST_INCLUDE;
1533#ifdef CONFIG_IP_MULTICAST
e905a9ed 1534 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1535 IGMP_Unsolicited_Report_Count;
1536 in_dev->mr_ifc_count = pmc->crcount;
1537 for (psf=pmc->sources; psf; psf = psf->sf_next)
1538 psf->sf_crcount = 0;
1539 igmp_ifc_event(pmc->interface);
1540 } else if (sf_setstate(pmc) || changerec) {
1541 igmp_ifc_event(pmc->interface);
1542#endif
1543 }
1544out_unlock:
1545 spin_unlock_bh(&pmc->lock);
1546 return err;
1547}
1548
1549/*
1550 * Add multicast single-source filter to the interface list
1551 */
1552static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1553 __be32 *psfsrc, int delta)
1da177e4
LT		 1554{
1555 struct ip_sf_list *psf, *psf_prev;
1556
1557 psf_prev = NULL;
1558 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1559 if (psf->sf_inaddr == *psfsrc)
1560 break;
1561 psf_prev = psf;
1562 }
1563 if (!psf) {
0da974f4 1564 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1565 if (!psf)
1566 return -ENOBUFS;
1da177e4
LT		 1567 psf->sf_inaddr = *psfsrc;
1568 if (psf_prev) {
1569 psf_prev->sf_next = psf;
1570 } else
1571 pmc->sources = psf;
1572 }
1573 psf->sf_count[sfmode]++;
1574 if (psf->sf_count[sfmode] == 1) {
1575 ip_rt_multicast_event(pmc->interface);
1576 }
1577 return 0;
1578}
1579
1580#ifdef CONFIG_IP_MULTICAST
1581static void sf_markstate(struct ip_mc_list *pmc)
1582{
1583 struct ip_sf_list *psf;
1584 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1585
1586 for (psf=pmc->sources; psf; psf=psf->sf_next)
1587 if (pmc->sfcount[MCAST_EXCLUDE]) {
1588 psf->sf_oldin = mca_xcount ==
1589 psf->sf_count[MCAST_EXCLUDE] &&
1590 !psf->sf_count[MCAST_INCLUDE];
1591 } else
1592 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1593}
1594
1595static int sf_setstate(struct ip_mc_list *pmc)
1596{
ad12583f 1597 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1598 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1599 int qrv = pmc->interface->mr_qrv;
1600 int new_in, rv;
1601
1602 rv = 0;
1603 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1604 if (pmc->sfcount[MCAST_EXCLUDE]) {
1605 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1606 !psf->sf_count[MCAST_INCLUDE];
1607 } else
1608 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1609 if (new_in) {
1610 if (!psf->sf_oldin) {
76edc605 1611 struct ip_sf_list *prev = NULL;
ad12583f
DS		 1612
1613 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1614 if (dpsf->sf_inaddr == psf->sf_inaddr)
1615 break;
1616 prev = dpsf;
1617 }
1618 if (dpsf) {
1619 if (prev)
1620 prev->sf_next = dpsf->sf_next;
1621 else
1622 pmc->tomb = dpsf->sf_next;
1623 kfree(dpsf);
1624 }
1625 psf->sf_crcount = qrv;
1626 rv++;
1627 }
1628 } else if (psf->sf_oldin) {
1629
1630 psf->sf_crcount = 0;
1631 /*
1632 * add or update "delete" records if an active filter
1633 * is now inactive
1634 */
1635 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1636 if (dpsf->sf_inaddr == psf->sf_inaddr)
1637 break;
1638 if (!dpsf) {
1639 dpsf = (struct ip_sf_list *)
1640 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1641 if (!dpsf)
1642 continue;
1643 *dpsf = *psf;
1644 /* pmc->lock held by callers */
1645 dpsf->sf_next = pmc->tomb;
1646 pmc->tomb = dpsf;
1647 }
1648 dpsf->sf_crcount = qrv;
1da177e4
LT		 1649 rv++;
1650 }
1651 }
1652 return rv;
1653}
1654#endif
1655
1656/*
1657 * Add multicast source filter list to the interface list
1658 */
8f935bbd
AV		 1659static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1660 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1661{
1662 struct ip_mc_list *pmc;
1663 int isexclude;
1664 int i, err;
1665
1666 if (!in_dev)
1667 return -ENODEV;
1668 read_lock(&in_dev->mc_list_lock);
1669 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1670 if (*pmca == pmc->multiaddr)
1671 break;
1672 }
1673 if (!pmc) {
1674 /* MCA not found?? bug */
1675 read_unlock(&in_dev->mc_list_lock);
1676 return -ESRCH;
1677 }
1678 spin_lock_bh(&pmc->lock);
1679 read_unlock(&in_dev->mc_list_lock);
1680
1681#ifdef CONFIG_IP_MULTICAST
1682 sf_markstate(pmc);
1683#endif
1684 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1685 if (!delta)
1686 pmc->sfcount[sfmode]++;
1687 err = 0;
1688 for (i=0; i<sfcount; i++) {
1689 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1690 if (err)
1691 break;
1692 }
1693 if (err) {
1694 int j;
1695
1696 pmc->sfcount[sfmode]--;
1697 for (j=0; j<i; j++)
1698 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1699 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1700#ifdef CONFIG_IP_MULTICAST
1da177e4 1701 struct ip_sf_list *psf;
cfcabdcc 1702 in_dev = pmc->interface;
1da177e4
LT		 1703#endif
1704
1705 /* filter mode change */
1706 if (pmc->sfcount[MCAST_EXCLUDE])
1707 pmc->sfmode = MCAST_EXCLUDE;
1708 else if (pmc->sfcount[MCAST_INCLUDE])
1709 pmc->sfmode = MCAST_INCLUDE;
1710#ifdef CONFIG_IP_MULTICAST
1711 /* else no filters; keep old mode for reports */
1712
e905a9ed 1713 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1714 IGMP_Unsolicited_Report_Count;
1715 in_dev->mr_ifc_count = pmc->crcount;
1716 for (psf=pmc->sources; psf; psf = psf->sf_next)
1717 psf->sf_crcount = 0;
1718 igmp_ifc_event(in_dev);
1719 } else if (sf_setstate(pmc)) {
1720 igmp_ifc_event(in_dev);
1721#endif
1722 }
1723 spin_unlock_bh(&pmc->lock);
1724 return err;
1725}
1726
1727static void ip_mc_clear_src(struct ip_mc_list *pmc)
1728{
1729 struct ip_sf_list *psf, *nextpsf;
1730
1731 for (psf=pmc->tomb; psf; psf=nextpsf) {
1732 nextpsf = psf->sf_next;
1733 kfree(psf);
1734 }
1735 pmc->tomb = NULL;
1736 for (psf=pmc->sources; psf; psf=nextpsf) {
1737 nextpsf = psf->sf_next;
1738 kfree(psf);
1739 }
1740 pmc->sources = NULL;
1741 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1742 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1743 pmc->sfcount[MCAST_EXCLUDE] = 1;
1744}
1745
1746
1747/*
1748 * Join a multicast group
1749 */
1750int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1751{
1752 int err;
8f935bbd 1753 __be32 addr = imr->imr_multiaddr.s_addr;
ca9b907d 1754 struct ip_mc_socklist *iml=NULL, *i;
1da177e4
LT		 1755 struct in_device *in_dev;
1756 struct inet_sock *inet = inet_sk(sk);
ca9b907d 1757 int ifindex;
1da177e4
LT		 1758 int count = 0;
1759
f97c1e0c 1760 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1761 return -EINVAL;
1762
721499e8 1763 if (!net_eq(sock_net(sk), &init_net))
2430aa85
DL		 1764 return -EPROTONOSUPPORT;
1765
6756ae4b 1766 rtnl_lock();
1da177e4
LT		 1767
1768 in_dev = ip_mc_find_dev(imr);
1769
1770 if (!in_dev) {
1771 iml = NULL;
1772 err = -ENODEV;
1773 goto done;
1774 }
1775
1da177e4 1776 err = -EADDRINUSE;
ca9b907d 1777 ifindex = imr->imr_ifindex;
1da177e4 1778 for (i = inet->mc_list; i; i = i->next) {
ca9b907d
DS		 1779 if (i->multi.imr_multiaddr.s_addr == addr &&
1780 i->multi.imr_ifindex == ifindex)
1da177e4 1781 goto done;
1da177e4
LT		 1782 count++;
1783 }
1784 err = -ENOBUFS;
ca9b907d
DS		 1785 if (count >= sysctl_igmp_max_memberships)
1786 goto done;
8b3a7005 1787 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
ca9b907d 1788 if (iml == NULL)
1da177e4 1789 goto done;
ca9b907d 1790
1da177e4
LT		 1791 memcpy(&iml->multi, imr, sizeof(*imr));
1792 iml->next = inet->mc_list;
1da177e4
LT		 1793 iml->sflist = NULL;
1794 iml->sfmode = MCAST_EXCLUDE;
1795 inet->mc_list = iml;
1796 ip_mc_inc_group(in_dev, addr);
1da177e4 1797 err = 0;
1da177e4 1798done:
6756ae4b 1799 rtnl_unlock();
1da177e4
LT		 1800 return err;
1801}
1802
1803static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1804 struct in_device *in_dev)
1805{
1806 int err;
1807
cfcabdcc 1808 if (iml->sflist == NULL) {
1da177e4
LT		 1809 /* any-source empty exclude case */
1810 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1811 iml->sfmode, 0, NULL, 0);
1812 }
1813 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1814 iml->sfmode, iml->sflist->sl_count,
1815 iml->sflist->sl_addr, 0);
1816 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1817 iml->sflist = NULL;
1818 return err;
1819}
1820
1821/*
1822 * Ask a socket to leave a group.
1823 */
1824
1825int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1826{
1827 struct inet_sock *inet = inet_sk(sk);
1828 struct ip_mc_socklist *iml, **imlp;
84b42bae 1829 struct in_device *in_dev;
8f935bbd 1830 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1831 u32 ifindex;
acd6e00b 1832 int ret = -EADDRNOTAVAIL;
1da177e4 1833
721499e8 1834 if (!net_eq(sock_net(sk), &init_net))
2430aa85
DL		 1835 return -EPROTONOSUPPORT;
1836
1da177e4 1837 rtnl_lock();
84b42bae 1838 in_dev = ip_mc_find_dev(imr);
84b42bae 1839 ifindex = imr->imr_ifindex;
1da177e4 1840 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
acd6e00b
DS		 1841 if (iml->multi.imr_multiaddr.s_addr != group)
1842 continue;
1843 if (ifindex) {
1844 if (iml->multi.imr_ifindex != ifindex)
1845 continue;
1846 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1847 iml->multi.imr_address.s_addr)
1848 continue;
1da177e4 1849
acd6e00b 1850 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4 1851
acd6e00b
DS		 1852 *imlp = iml->next;
1853
1854 if (in_dev)
84b42bae 1855 ip_mc_dec_group(in_dev, group);
acd6e00b
DS		 1856 rtnl_unlock();
1857 sock_kfree_s(sk, iml, sizeof(*iml));
1858 return 0;
1da177e4 1859 }
acd6e00b
DS		 1860 if (!in_dev)
1861 ret = -ENODEV;
1da177e4 1862 rtnl_unlock();
acd6e00b 1863 return ret;
1da177e4
LT		 1864}
1865
1866int ip_mc_source(int add, int omode, struct sock *sk, struct
1867 ip_mreq_source *mreqs, int ifindex)
1868{
1869 int err;
1870 struct ip_mreqn imr;
63007727 1871 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 1872 struct ip_mc_socklist *pmc;
1873 struct in_device *in_dev = NULL;
1874 struct inet_sock *inet = inet_sk(sk);
1875 struct ip_sf_socklist *psl;
8cdaaa15 1876 int leavegroup = 0;
1da177e4
LT		 1877 int i, j, rv;
1878
f97c1e0c 1879 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1880 return -EINVAL;
1881
721499e8 1882 if (!net_eq(sock_net(sk), &init_net))
2430aa85
DL		 1883 return -EPROTONOSUPPORT;
1884
6756ae4b 1885 rtnl_lock();
1da177e4
LT		 1886
1887 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1888 imr.imr_address.s_addr = mreqs->imr_interface;
1889 imr.imr_ifindex = ifindex;
1890 in_dev = ip_mc_find_dev(&imr);
1891
1892 if (!in_dev) {
1893 err = -ENODEV;
1894 goto done;
1895 }
1896 err = -EADDRNOTAVAIL;
1897
1898 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
ca9b907d
DS		 1899 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1900 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1da177e4
LT		 1901 break;
1902 }
917f2f10
DS		 1903 if (!pmc) { /* must have a prior join */
1904 err = -EINVAL;
1da177e4 1905 goto done;
917f2f10 1906 }
1da177e4
LT		 1907 /* if a source filter was set, must be the same mode as before */
1908 if (pmc->sflist) {
917f2f10
DS		 1909 if (pmc->sfmode != omode) {
1910 err = -EINVAL;
1da177e4 1911 goto done;
917f2f10 1912 }
1da177e4
LT		 1913 } else if (pmc->sfmode != omode) {
1914 /* allow mode switches for empty-set filters */
1915 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 1916 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 1917 NULL, 0);
1918 pmc->sfmode = omode;
1919 }
1920
1921 psl = pmc->sflist;
1922 if (!add) {
1923 if (!psl)
917f2f10 1924 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1925 rv = !0;
1926 for (i=0; i<psl->sl_count; i++) {
1927 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1928 sizeof(__be32));
1da177e4
LT		 1929 if (rv == 0)
1930 break;
1931 }
1932 if (rv) /* source not found */
917f2f10 1933 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1934
8cdaaa15
DS		 1935 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1936 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1937 leavegroup = 1;
1938 goto done;
1939 }
1940
1da177e4 1941 /* update the interface filter */
e905a9ed 1942 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1943 &mreqs->imr_sourceaddr, 1);
1944
1945 for (j=i+1; j<psl->sl_count; j++)
1946 psl->sl_addr[j-1] = psl->sl_addr[j];
1947 psl->sl_count--;
1948 err = 0;
1949 goto done;
1950 }
1951 /* else, add a new source to the filter */
1952
1953 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1954 err = -ENOBUFS;
1955 goto done;
1956 }
1957 if (!psl || psl->sl_count == psl->sl_max) {
1958 struct ip_sf_socklist *newpsl;
1959 int count = IP_SFBLOCK;
1960
1961 if (psl)
1962 count += psl->sl_max;
8b3a7005 1963 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 1964 if (!newpsl) {
1965 err = -ENOBUFS;
1966 goto done;
1967 }
1968 newpsl->sl_max = count;
1969 newpsl->sl_count = count - IP_SFBLOCK;
1970 if (psl) {
1971 for (i=0; i<psl->sl_count; i++)
1972 newpsl->sl_addr[i] = psl->sl_addr[i];
1973 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1974 }
1975 pmc->sflist = psl = newpsl;
1976 }
1977 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1978 for (i=0; i<psl->sl_count; i++) {
1979 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1980 sizeof(__be32));
1da177e4
LT		 1981 if (rv == 0)
1982 break;
1983 }
1984 if (rv == 0) /* address already there is an error */
1985 goto done;
1986 for (j=psl->sl_count-1; j>=i; j--)
1987 psl->sl_addr[j+1] = psl->sl_addr[j];
1988 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1989 psl->sl_count++;
1990 err = 0;
1991 /* update the interface list */
e905a9ed 1992 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1993 &mreqs->imr_sourceaddr, 1);
1994done:
6756ae4b 1995 rtnl_unlock();
8cdaaa15
DS		 1996 if (leavegroup)
1997 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 1998 return err;
1999}
2000
2001int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2002{
9951f036 2003 int err = 0;
1da177e4 2004 struct ip_mreqn imr;
63007727 2005 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2006 struct ip_mc_socklist *pmc;
2007 struct in_device *in_dev;
2008 struct inet_sock *inet = inet_sk(sk);
2009 struct ip_sf_socklist *newpsl, *psl;
9951f036 2010 int leavegroup = 0;
1da177e4 2011
f97c1e0c 2012 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2013 return -EINVAL;
2014 if (msf->imsf_fmode != MCAST_INCLUDE &&
2015 msf->imsf_fmode != MCAST_EXCLUDE)
2016 return -EINVAL;
2017
721499e8 2018 if (!net_eq(sock_net(sk), &init_net))
2430aa85
DL		 2019 return -EPROTONOSUPPORT;
2020
6756ae4b 2021 rtnl_lock();
1da177e4
LT		 2022
2023 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2024 imr.imr_address.s_addr = msf->imsf_interface;
2025 imr.imr_ifindex = ifindex;
2026 in_dev = ip_mc_find_dev(&imr);
2027
2028 if (!in_dev) {
2029 err = -ENODEV;
2030 goto done;
2031 }
1da177e4 2032
9951f036
DS		 2033 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2034 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2035 leavegroup = 1;
2036 goto done;
2037 }
2038
1da177e4
LT		 2039 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2040 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2041 pmc->multi.imr_ifindex == imr.imr_ifindex)
2042 break;
2043 }
917f2f10
DS		 2044 if (!pmc) { /* must have a prior join */
2045 err = -EINVAL;
1da177e4 2046 goto done;
917f2f10 2047 }
1da177e4 2048 if (msf->imsf_numsrc) {
8b3a7005
KK		 2049 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2050 GFP_KERNEL);
1da177e4
LT		 2051 if (!newpsl) {
2052 err = -ENOBUFS;
2053 goto done;
2054 }
2055 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2056 memcpy(newpsl->sl_addr, msf->imsf_slist,
2057 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2058 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2059 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2060 if (err) {
2061 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2062 goto done;
2063 }
8713dbf0 2064 } else {
1da177e4 2065 newpsl = NULL;
8713dbf0
YZ		 2066 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2067 msf->imsf_fmode, 0, NULL, 0);
2068 }
1da177e4
LT		 2069 psl = pmc->sflist;
2070 if (psl) {
2071 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2072 psl->sl_count, psl->sl_addr, 0);
2073 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2074 } else
2075 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2076 0, NULL, 0);
2077 pmc->sflist = newpsl;
2078 pmc->sfmode = msf->imsf_fmode;
917f2f10 2079 err = 0;
1da177e4 2080done:
6756ae4b 2081 rtnl_unlock();
9951f036
DS		 2082 if (leavegroup)
2083 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2084 return err;
2085}
2086
2087int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2088 struct ip_msfilter __user *optval, int __user *optlen)
2089{
2090 int err, len, count, copycount;
2091 struct ip_mreqn imr;
63007727 2092 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2093 struct ip_mc_socklist *pmc;
2094 struct in_device *in_dev;
2095 struct inet_sock *inet = inet_sk(sk);
2096 struct ip_sf_socklist *psl;
2097
f97c1e0c 2098 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2099 return -EINVAL;
2100
721499e8 2101 if (!net_eq(sock_net(sk), &init_net))
2430aa85
DL		 2102 return -EPROTONOSUPPORT;
2103
6756ae4b 2104 rtnl_lock();
1da177e4
LT		 2105
2106 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2107 imr.imr_address.s_addr = msf->imsf_interface;
2108 imr.imr_ifindex = 0;
2109 in_dev = ip_mc_find_dev(&imr);
2110
2111 if (!in_dev) {
2112 err = -ENODEV;
2113 goto done;
2114 }
2115 err = -EADDRNOTAVAIL;
2116
2117 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2118 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2119 pmc->multi.imr_ifindex == imr.imr_ifindex)
2120 break;
2121 }
2122 if (!pmc) /* must have a prior join */
2123 goto done;
2124 msf->imsf_fmode = pmc->sfmode;
2125 psl = pmc->sflist;
6756ae4b 2126 rtnl_unlock();
1da177e4
LT		 2127 if (!psl) {
2128 len = 0;
2129 count = 0;
2130 } else {
2131 count = psl->sl_count;
2132 }
2133 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2134 len = copycount * sizeof(psl->sl_addr[0]);
2135 msf->imsf_numsrc = count;
2136 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2137 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2138 return -EFAULT;
2139 }
2140 if (len &&
2141 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2142 return -EFAULT;
2143 return 0;
2144done:
6756ae4b 2145 rtnl_unlock();
1da177e4
LT		 2146 return err;
2147}
2148
2149int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2150 struct group_filter __user *optval, int __user *optlen)
2151{
2152 int err, i, count, copycount;
2153 struct sockaddr_in *psin;
63007727 2154 __be32 addr;
1da177e4
LT		 2155 struct ip_mc_socklist *pmc;
2156 struct inet_sock *inet = inet_sk(sk);
2157 struct ip_sf_socklist *psl;
2158
2159 psin = (struct sockaddr_in *)&gsf->gf_group;
2160 if (psin->sin_family != AF_INET)
2161 return -EINVAL;
2162 addr = psin->sin_addr.s_addr;
f97c1e0c 2163 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2164 return -EINVAL;
2165
721499e8 2166 if (!net_eq(sock_net(sk), &init_net))
2430aa85
DL		 2167 return -EPROTONOSUPPORT;
2168
6756ae4b 2169 rtnl_lock();
1da177e4
LT		 2170
2171 err = -EADDRNOTAVAIL;
2172
2173 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2174 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2175 pmc->multi.imr_ifindex == gsf->gf_interface)
2176 break;
2177 }
2178 if (!pmc) /* must have a prior join */
2179 goto done;
2180 gsf->gf_fmode = pmc->sfmode;
2181 psl = pmc->sflist;
6756ae4b 2182 rtnl_unlock();
1da177e4
LT		 2183 count = psl ? psl->sl_count : 0;
2184 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2185 gsf->gf_numsrc = count;
2186 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2187 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2188 return -EFAULT;
2189 }
2190 for (i=0; i<copycount; i++) {
1da177e4
LT		 2191 struct sockaddr_storage ss;
2192
2193 psin = (struct sockaddr_in *)&ss;
2194 memset(&ss, 0, sizeof(ss));
2195 psin->sin_family = AF_INET;
2196 psin->sin_addr.s_addr = psl->sl_addr[i];
2197 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2198 return -EFAULT;
2199 }
2200 return 0;
2201done:
6756ae4b 2202 rtnl_unlock();
1da177e4
LT		 2203 return err;
2204}
2205
2206/*
2207 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2208 */
c0cda068 2209int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2210{
2211 struct inet_sock *inet = inet_sk(sk);
2212 struct ip_mc_socklist *pmc;
2213 struct ip_sf_socklist *psl;
2214 int i;
2215
f97c1e0c 2216 if (!ipv4_is_multicast(loc_addr))
1da177e4
LT		 2217 return 1;
2218
2219 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2220 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2221 pmc->multi.imr_ifindex == dif)
2222 break;
2223 }
2224 if (!pmc)
2225 return 1;
2226 psl = pmc->sflist;
2227 if (!psl)
2228 return pmc->sfmode == MCAST_EXCLUDE;
2229
2230 for (i=0; i<psl->sl_count; i++) {
2231 if (psl->sl_addr[i] == rmt_addr)
2232 break;
2233 }
2234 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2235 return 0;
2236 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2237 return 0;
2238 return 1;
2239}
2240
2241/*
2242 * A socket is closing.
2243 */
2244
2245void ip_mc_drop_socket(struct sock *sk)
2246{
2247 struct inet_sock *inet = inet_sk(sk);
2248 struct ip_mc_socklist *iml;
2249
2250 if (inet->mc_list == NULL)
2251 return;
2252
721499e8 2253 if (!net_eq(sock_net(sk), &init_net))
2430aa85
DL		 2254 return;
2255
1da177e4
LT		 2256 rtnl_lock();
2257 while ((iml = inet->mc_list) != NULL) {
2258 struct in_device *in_dev;
2259 inet->mc_list = iml->next;
2260
7fee0ca2 2261 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex);
bb699cbc
MR		 2262 (void) ip_mc_leave_src(sk, iml, in_dev);
2263 if (in_dev != NULL) {
1da177e4
LT		 2264 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2265 in_dev_put(in_dev);
2266 }
2267 sock_kfree_s(sk, iml, sizeof(*iml));
1da177e4
LT		 2268 }
2269 rtnl_unlock();
2270}
2271
a60c4923 2272int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2273{
2274 struct ip_mc_list *im;
2275 struct ip_sf_list *psf;
2276 int rv = 0;
2277
2278 read_lock(&in_dev->mc_list_lock);
2279 for (im=in_dev->mc_list; im; im=im->next) {
2280 if (im->multiaddr == mc_addr)
2281 break;
2282 }
2283 if (im && proto == IPPROTO_IGMP) {
2284 rv = 1;
2285 } else if (im) {
2286 if (src_addr) {
2287 for (psf=im->sources; psf; psf=psf->sf_next) {
2288 if (psf->sf_inaddr == src_addr)
2289 break;
2290 }
2291 if (psf)
2292 rv = psf->sf_count[MCAST_INCLUDE] ||
2293 psf->sf_count[MCAST_EXCLUDE] !=
2294 im->sfcount[MCAST_EXCLUDE];
2295 else
2296 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2297 } else
2298 rv = 1; /* unspecified source; tentatively allow */
2299 }
2300 read_unlock(&in_dev->mc_list_lock);
2301 return rv;
2302}
2303
2304#if defined(CONFIG_PROC_FS)
2305struct igmp_mc_iter_state {
2306 struct net_device *dev;
2307 struct in_device *in_dev;
2308};
2309
2310#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2311
2312static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2313{
2314 struct ip_mc_list *im = NULL;
2315 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2316
7562f876 2317 state->in_dev = NULL;
881d966b 2318 for_each_netdev(&init_net, state->dev) {
1da177e4
LT		 2319 struct in_device *in_dev;
2320 in_dev = in_dev_get(state->dev);
2321 if (!in_dev)
2322 continue;
2323 read_lock(&in_dev->mc_list_lock);
2324 im = in_dev->mc_list;
2325 if (im) {
2326 state->in_dev = in_dev;
2327 break;
2328 }
2329 read_unlock(&in_dev->mc_list_lock);
2330 in_dev_put(in_dev);
2331 }
2332 return im;
2333}
2334
2335static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2336{
2337 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2338 im = im->next;
2339 while (!im) {
2340 if (likely(state->in_dev != NULL)) {
2341 read_unlock(&state->in_dev->mc_list_lock);
2342 in_dev_put(state->in_dev);
2343 }
7562f876 2344 state->dev = next_net_device(state->dev);
1da177e4
LT		 2345 if (!state->dev) {
2346 state->in_dev = NULL;
2347 break;
2348 }
2349 state->in_dev = in_dev_get(state->dev);
2350 if (!state->in_dev)
2351 continue;
2352 read_lock(&state->in_dev->mc_list_lock);
2353 im = state->in_dev->mc_list;
2354 }
2355 return im;
2356}
2357
2358static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2359{
2360 struct ip_mc_list *im = igmp_mc_get_first(seq);
2361 if (im)
2362 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2363 --pos;
2364 return pos ? NULL : im;
2365}
2366
2367static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
dd329bfa 2368 __acquires(dev_base_lock)
1da177e4
LT		 2369{
2370 read_lock(&dev_base_lock);
2371 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2372}
2373
2374static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2375{
2376 struct ip_mc_list *im;
2377 if (v == SEQ_START_TOKEN)
2378 im = igmp_mc_get_first(seq);
2379 else
2380 im = igmp_mc_get_next(seq, v);
2381 ++*pos;
2382 return im;
2383}
2384
2385static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
dd329bfa 2386 __releases(dev_base_lock)
1da177e4
LT		 2387{
2388 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2389 if (likely(state->in_dev != NULL)) {
2390 read_unlock(&state->in_dev->mc_list_lock);
2391 in_dev_put(state->in_dev);
2392 state->in_dev = NULL;
2393 }
2394 state->dev = NULL;
2395 read_unlock(&dev_base_lock);
2396}
2397
2398static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2399{
2400 if (v == SEQ_START_TOKEN)
e905a9ed 2401 seq_puts(seq,
1da177e4
LT		 2402 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2403 else {
2404 struct ip_mc_list *im = (struct ip_mc_list *)v;
2405 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2406 char *querier;
2407#ifdef CONFIG_IP_MULTICAST
2408 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2409 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2410 "V3";
2411#else
2412 querier = "NONE";
2413#endif
2414
2415 if (state->in_dev->mc_list == im) {
2416 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2417 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2418 }
2419
2420 seq_printf(seq,
338fcf98 2421 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4
LT		 2422 im->multiaddr, im->users,
2423 im->tm_running, im->tm_running ?
2424 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2425 im->reporter);
2426 }
2427 return 0;
2428}
2429
f690808e 2430static const struct seq_operations igmp_mc_seq_ops = {
1da177e4
LT		 2431 .start = igmp_mc_seq_start,
2432 .next = igmp_mc_seq_next,
2433 .stop = igmp_mc_seq_stop,
2434 .show = igmp_mc_seq_show,
2435};
2436
2437static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2438{
cf7732e4
PE		 2439 return seq_open_private(file, &igmp_mc_seq_ops,
2440 sizeof(struct igmp_mc_iter_state));
1da177e4
LT		 2441}
2442
9a32144e 2443static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2444 .owner = THIS_MODULE,
2445 .open = igmp_mc_seq_open,
2446 .read = seq_read,
2447 .llseek = seq_lseek,
2448 .release = seq_release_private,
2449};
2450
2451struct igmp_mcf_iter_state {
2452 struct net_device *dev;
2453 struct in_device *idev;
2454 struct ip_mc_list *im;
2455};
2456
2457#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2458
2459static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2460{
2461 struct ip_sf_list *psf = NULL;
2462 struct ip_mc_list *im = NULL;
2463 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2464
7562f876
PE		 2465 state->idev = NULL;
2466 state->im = NULL;
881d966b 2467 for_each_netdev(&init_net, state->dev) {
1da177e4
LT		 2468 struct in_device *idev;
2469 idev = in_dev_get(state->dev);
2470 if (unlikely(idev == NULL))
2471 continue;
2472 read_lock(&idev->mc_list_lock);
2473 im = idev->mc_list;
2474 if (likely(im != NULL)) {
2475 spin_lock_bh(&im->lock);
2476 psf = im->sources;
2477 if (likely(psf != NULL)) {
2478 state->im = im;
2479 state->idev = idev;
2480 break;
2481 }
2482 spin_unlock_bh(&im->lock);
2483 }
2484 read_unlock(&idev->mc_list_lock);
2485 in_dev_put(idev);
2486 }
2487 return psf;
2488}
2489
2490static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2491{
2492 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2493
2494 psf = psf->sf_next;
2495 while (!psf) {
2496 spin_unlock_bh(&state->im->lock);
2497 state->im = state->im->next;
2498 while (!state->im) {
2499 if (likely(state->idev != NULL)) {
2500 read_unlock(&state->idev->mc_list_lock);
2501 in_dev_put(state->idev);
2502 }
7562f876 2503 state->dev = next_net_device(state->dev);
1da177e4
LT		 2504 if (!state->dev) {
2505 state->idev = NULL;
2506 goto out;
2507 }
2508 state->idev = in_dev_get(state->dev);
2509 if (!state->idev)
2510 continue;
2511 read_lock(&state->idev->mc_list_lock);
2512 state->im = state->idev->mc_list;
2513 }
2514 if (!state->im)
2515 break;
2516 spin_lock_bh(&state->im->lock);
2517 psf = state->im->sources;
2518 }
2519out:
2520 return psf;
2521}
2522
2523static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2524{
2525 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2526 if (psf)
2527 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2528 --pos;
2529 return pos ? NULL : psf;
2530}
2531
2532static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2533{
2534 read_lock(&dev_base_lock);
2535 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2536}
2537
2538static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2539{
2540 struct ip_sf_list *psf;
2541 if (v == SEQ_START_TOKEN)
2542 psf = igmp_mcf_get_first(seq);
2543 else
2544 psf = igmp_mcf_get_next(seq, v);
2545 ++*pos;
2546 return psf;
2547}
2548
2549static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2550{
2551 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2552 if (likely(state->im != NULL)) {
2553 spin_unlock_bh(&state->im->lock);
2554 state->im = NULL;
2555 }
2556 if (likely(state->idev != NULL)) {
2557 read_unlock(&state->idev->mc_list_lock);
2558 in_dev_put(state->idev);
2559 state->idev = NULL;
2560 }
2561 state->dev = NULL;
2562 read_unlock(&dev_base_lock);
2563}
2564
2565static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2566{
2567 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2568 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2569
2570 if (v == SEQ_START_TOKEN) {
e905a9ed 2571 seq_printf(seq,
1da177e4
LT		 2572 "%3s %6s "
2573 "%10s %10s %6s %6s\n", "Idx",
2574 "Device", "MCA",
2575 "SRC", "INC", "EXC");
2576 } else {
2577 seq_printf(seq,
2578 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2579 "0x%08x %6lu %6lu\n",
2580 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2581 ntohl(state->im->multiaddr),
2582 ntohl(psf->sf_inaddr),
2583 psf->sf_count[MCAST_INCLUDE],
2584 psf->sf_count[MCAST_EXCLUDE]);
2585 }
2586 return 0;
2587}
2588
f690808e 2589static const struct seq_operations igmp_mcf_seq_ops = {
1da177e4
LT		 2590 .start = igmp_mcf_seq_start,
2591 .next = igmp_mcf_seq_next,
2592 .stop = igmp_mcf_seq_stop,
2593 .show = igmp_mcf_seq_show,
2594};
2595
2596static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2597{
cf7732e4
PE		 2598 return seq_open_private(file, &igmp_mcf_seq_ops,
2599 sizeof(struct igmp_mcf_iter_state));
1da177e4
LT		 2600}
2601
9a32144e 2602static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2603 .owner = THIS_MODULE,
2604 .open = igmp_mcf_seq_open,
2605 .read = seq_read,
2606 .llseek = seq_lseek,
2607 .release = seq_release_private,
2608};
2609
2610int __init igmp_mc_proc_init(void)
2611{
457c4cbc
EB		 2612 proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2613 proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
1da177e4
LT		 2614 return 0;
2615}
2616#endif
2617
2618EXPORT_SYMBOL(ip_mc_dec_group);
2619EXPORT_SYMBOL(ip_mc_inc_group);
2620EXPORT_SYMBOL(ip_mc_join_group);
a816c7c7 2621EXPORT_SYMBOL(ip_mc_rejoin_group);
Linux kernel - Deliverables
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