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Merge tag 'v3.10.107' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv4 / igmp.c
CommitLineData
1da177e4
LT		 1/*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
1da177e4 11 * Authors:
113aa838 12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
1da177e4
LT		 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 73#include <linux/module.h>
5a0e3ad6 74#include <linux/slab.h>
1da177e4 75#include <asm/uaccess.h>
1da177e4
LT		 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);
42ea299d 155 kfree_rcu(im, rcu);
1da177e4
LT		 156 }
157}
158
d9aa9380
DM		 159#define for_each_pmc_rcu(in_dev, pmc) \
160 for (pmc = rcu_dereference(in_dev->mc_list); \
161 pmc != NULL; \
162 pmc = rcu_dereference(pmc->next_rcu))
163
164#define for_each_pmc_rtnl(in_dev, pmc) \
165 for (pmc = rtnl_dereference(in_dev->mc_list); \
166 pmc != NULL; \
167 pmc = rtnl_dereference(pmc->next_rcu))
168
1da177e4
LT		 169#ifdef CONFIG_IP_MULTICAST
170
171/*
172 * Timer management
173 */
174
1d7138de 175static void igmp_stop_timer(struct ip_mc_list *im)
1da177e4
LT		 176{
177 spin_lock_bh(&im->lock);
178 if (del_timer(&im->timer))
179 atomic_dec(&im->refcnt);
a7e9ff73 180 im->tm_running = 0;
1da177e4
LT		 181 im->reporter = 0;
182 im->unsolicit_count = 0;
183 spin_unlock_bh(&im->lock);
184}
185
186/* It must be called with locked im->lock */
187static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
188{
a7e9ff73 189 int tv = net_random() % max_delay;
1da177e4 190
a7e9ff73 191 im->tm_running = 1;
1da177e4
LT		 192 if (!mod_timer(&im->timer, jiffies+tv+2))
193 atomic_inc(&im->refcnt);
194}
195
196static void igmp_gq_start_timer(struct in_device *in_dev)
197{
198 int tv = net_random() % in_dev->mr_maxdelay;
461527f7
MT		 199 unsigned long exp = jiffies + tv + 2;
200
201 if (in_dev->mr_gq_running &&
202 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
203 return;
1da177e4
LT		 204
205 in_dev->mr_gq_running = 1;
461527f7 206 if (!mod_timer(&in_dev->mr_gq_timer, exp))
1da177e4
LT		 207 in_dev_hold(in_dev);
208}
209
210static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
211{
212 int tv = net_random() % delay;
213
214 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
215 in_dev_hold(in_dev);
216}
217
218static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
219{
220 spin_lock_bh(&im->lock);
221 im->unsolicit_count = 0;
222 if (del_timer(&im->timer)) {
223 if ((long)(im->timer.expires-jiffies) < max_delay) {
224 add_timer(&im->timer);
a7e9ff73 225 im->tm_running = 1;
1da177e4
LT		 226 spin_unlock_bh(&im->lock);
227 return;
228 }
229 atomic_dec(&im->refcnt);
230 }
231 igmp_start_timer(im, max_delay);
232 spin_unlock_bh(&im->lock);
233}
234
235
236/*
237 * Send an IGMP report.
238 */
239
240#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
241
242
243static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
244 int gdeleted, int sdeleted)
245{
246 switch (type) {
247 case IGMPV3_MODE_IS_INCLUDE:
248 case IGMPV3_MODE_IS_EXCLUDE:
249 if (gdeleted || sdeleted)
250 return 0;
ad12583f
DS		 251 if (!(pmc->gsquery && !psf->sf_gsresp)) {
252 if (pmc->sfmode == MCAST_INCLUDE)
253 return 1;
254 /* don't include if this source is excluded
255 * in all filters
256 */
257 if (psf->sf_count[MCAST_INCLUDE])
258 return type == IGMPV3_MODE_IS_INCLUDE;
259 return pmc->sfcount[MCAST_EXCLUDE] ==
260 psf->sf_count[MCAST_EXCLUDE];
261 }
262 return 0;
1da177e4
LT		 263 case IGMPV3_CHANGE_TO_INCLUDE:
264 if (gdeleted || sdeleted)
265 return 0;
266 return psf->sf_count[MCAST_INCLUDE] != 0;
267 case IGMPV3_CHANGE_TO_EXCLUDE:
268 if (gdeleted || sdeleted)
269 return 0;
270 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
271 psf->sf_count[MCAST_INCLUDE])
272 return 0;
273 return pmc->sfcount[MCAST_EXCLUDE] ==
274 psf->sf_count[MCAST_EXCLUDE];
275 case IGMPV3_ALLOW_NEW_SOURCES:
276 if (gdeleted || !psf->sf_crcount)
277 return 0;
278 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
279 case IGMPV3_BLOCK_OLD_SOURCES:
280 if (pmc->sfmode == MCAST_INCLUDE)
281 return gdeleted || (psf->sf_crcount && sdeleted);
282 return psf->sf_crcount && !gdeleted && !sdeleted;
283 }
284 return 0;
285}
286
287static int
288igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
289{
290 struct ip_sf_list *psf;
291 int scount = 0;
292
293 for (psf=pmc->sources; psf; psf=psf->sf_next) {
294 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
295 continue;
296 scount++;
297 }
298 return scount;
299}
300
57e1ab6e
ED		 301#define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
302
1da177e4
LT		 303static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
304{
305 struct sk_buff *skb;
306 struct rtable *rt;
307 struct iphdr *pip;
308 struct igmpv3_report *pig;
877acedc 309 struct net *net = dev_net(dev);
31e4543d 310 struct flowi4 fl4;
66088243
HX		 311 int hlen = LL_RESERVED_SPACE(dev);
312 int tlen = dev->needed_tailroom;
1da177e4 313
57e1ab6e 314 while (1) {
66088243 315 skb = alloc_skb(size + hlen + tlen,
57e1ab6e
ED		 316 GFP_ATOMIC | __GFP_NOWARN);
317 if (skb)
318 break;
319 size >>= 1;
320 if (size < 256)
321 return NULL;
322 }
323 igmp_skb_size(skb) = size;
1da177e4 324
31e4543d 325 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
78fbfd8a
DM		 326 0, 0,
327 IPPROTO_IGMP, 0, dev->ifindex);
328 if (IS_ERR(rt)) {
329 kfree_skb(skb);
330 return NULL;
1da177e4 331 }
1da177e4 332
d8d1f30b 333 skb_dst_set(skb, &rt->dst);
1da177e4
LT		 334 skb->dev = dev;
335
66088243 336 skb_reserve(skb, hlen);
1da177e4 337
7e28ecc2 338 skb_reset_network_header(skb);
eddc9ec5 339 pip = ip_hdr(skb);
7e28ecc2 340 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 341
342 pip->version = 4;
343 pip->ihl = (sizeof(struct iphdr)+4)>>2;
344 pip->tos = 0xc0;
345 pip->frag_off = htons(IP_DF);
346 pip->ttl = 1;
492f64ce
DM		 347 pip->daddr = fl4.daddr;
348 pip->saddr = fl4.saddr;
1da177e4
LT		 349 pip->protocol = IPPROTO_IGMP;
350 pip->tot_len = 0; /* filled in later */
ff1f69a8 351 ip_select_ident(skb, NULL);
5e73ea1a
DB		 352 ((u8 *)&pip[1])[0] = IPOPT_RA;
353 ((u8 *)&pip[1])[1] = 4;
354 ((u8 *)&pip[1])[2] = 0;
355 ((u8 *)&pip[1])[3] = 0;
1da177e4 356
b0e380b1 357 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
d10ba34b 358 skb_put(skb, sizeof(*pig));
d9edf9e2 359 pig = igmpv3_report_hdr(skb);
1da177e4
LT		 360 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
361 pig->resv1 = 0;
362 pig->csum = 0;
363 pig->resv2 = 0;
364 pig->ngrec = 0;
365 return skb;
366}
367
368static int igmpv3_sendpack(struct sk_buff *skb)
369{
d9edf9e2 370 struct igmphdr *pig = igmp_hdr(skb);
27a884dc 371 const int igmplen = skb->tail - skb->transport_header;
1da177e4 372
d9edf9e2 373 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
1da177e4 374
c439cb2e 375 return ip_local_out(skb);
1da177e4
LT		 376}
377
378static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
379{
a7e9ff73 380 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
1da177e4
LT		 381}
382
383static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
384 int type, struct igmpv3_grec **ppgr)
385{
386 struct net_device *dev = pmc->interface->dev;
387 struct igmpv3_report *pih;
388 struct igmpv3_grec *pgr;
389
390 if (!skb)
391 skb = igmpv3_newpack(dev, dev->mtu);
392 if (!skb)
393 return NULL;
394 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
395 pgr->grec_type = type;
396 pgr->grec_auxwords = 0;
397 pgr->grec_nsrcs = 0;
398 pgr->grec_mca = pmc->multiaddr;
d9edf9e2 399 pih = igmpv3_report_hdr(skb);
1da177e4
LT		 400 pih->ngrec = htons(ntohs(pih->ngrec)+1);
401 *ppgr = pgr;
402 return skb;
403}
404
57e1ab6e 405#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
1da177e4
LT		 406 skb_tailroom(skb)) : 0)
407
408static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
409 int type, int gdeleted, int sdeleted)
410{
411 struct net_device *dev = pmc->interface->dev;
412 struct igmpv3_report *pih;
413 struct igmpv3_grec *pgr = NULL;
414 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
ad12583f 415 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 416
417 if (pmc->multiaddr == IGMP_ALL_HOSTS)
418 return skb;
419
420 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
421 type == IGMPV3_MODE_IS_EXCLUDE;
422 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
423 type == IGMPV3_CHANGE_TO_EXCLUDE;
424
ad12583f
DS		 425 stotal = scount = 0;
426
1da177e4
LT		 427 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
428
ad12583f
DS		 429 if (!*psf_list)
430 goto empty_source;
431
d9edf9e2 432 pih = skb ? igmpv3_report_hdr(skb) : NULL;
1da177e4
LT		 433
434 /* EX and TO_EX get a fresh packet, if needed */
435 if (truncate) {
436 if (pih && pih->ngrec &&
437 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
438 if (skb)
439 igmpv3_sendpack(skb);
440 skb = igmpv3_newpack(dev, dev->mtu);
441 }
442 }
443 first = 1;
1da177e4
LT		 444 psf_prev = NULL;
445 for (psf=*psf_list; psf; psf=psf_next) {
ea4d9e72 446 __be32 *psrc;
1da177e4
LT		 447
448 psf_next = psf->sf_next;
449
450 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
451 psf_prev = psf;
452 continue;
453 }
454
455 /* clear marks on query responses */
456 if (isquery)
457 psf->sf_gsresp = 0;
458
63007727 459 if (AVAILABLE(skb) < sizeof(__be32) +
1da177e4
LT		 460 first*sizeof(struct igmpv3_grec)) {
461 if (truncate && !first)
462 break; /* truncate these */
463 if (pgr)
464 pgr->grec_nsrcs = htons(scount);
465 if (skb)
466 igmpv3_sendpack(skb);
467 skb = igmpv3_newpack(dev, dev->mtu);
468 first = 1;
469 scount = 0;
470 }
471 if (first) {
472 skb = add_grhead(skb, pmc, type, &pgr);
473 first = 0;
474 }
cc63f70b
AD		 475 if (!skb)
476 return NULL;
63007727 477 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
1da177e4 478 *psrc = psf->sf_inaddr;
ad12583f 479 scount++; stotal++;
1da177e4
LT		 480 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
481 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
482 psf->sf_crcount--;
483 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
484 if (psf_prev)
485 psf_prev->sf_next = psf->sf_next;
486 else
487 *psf_list = psf->sf_next;
488 kfree(psf);
489 continue;
490 }
491 }
492 psf_prev = psf;
493 }
ad12583f
DS		 494
495empty_source:
496 if (!stotal) {
497 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
498 type == IGMPV3_BLOCK_OLD_SOURCES)
499 return skb;
500 if (pmc->crcount || isquery) {
501 /* make sure we have room for group header */
502 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
503 igmpv3_sendpack(skb);
504 skb = NULL; /* add_grhead will get a new one */
505 }
506 skb = add_grhead(skb, pmc, type, &pgr);
507 }
508 }
1da177e4
LT		 509 if (pgr)
510 pgr->grec_nsrcs = htons(scount);
511
512 if (isquery)
513 pmc->gsquery = 0; /* clear query state on report */
514 return skb;
515}
516
517static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
518{
519 struct sk_buff *skb = NULL;
520 int type;
521
522 if (!pmc) {
1d7138de
ED		 523 rcu_read_lock();
524 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 525 if (pmc->multiaddr == IGMP_ALL_HOSTS)
526 continue;
527 spin_lock_bh(&pmc->lock);
528 if (pmc->sfcount[MCAST_EXCLUDE])
529 type = IGMPV3_MODE_IS_EXCLUDE;
530 else
531 type = IGMPV3_MODE_IS_INCLUDE;
532 skb = add_grec(skb, pmc, type, 0, 0);
533 spin_unlock_bh(&pmc->lock);
534 }
1d7138de 535 rcu_read_unlock();
1da177e4
LT		 536 } else {
537 spin_lock_bh(&pmc->lock);
538 if (pmc->sfcount[MCAST_EXCLUDE])
539 type = IGMPV3_MODE_IS_EXCLUDE;
540 else
541 type = IGMPV3_MODE_IS_INCLUDE;
542 skb = add_grec(skb, pmc, type, 0, 0);
543 spin_unlock_bh(&pmc->lock);
544 }
545 if (!skb)
546 return 0;
547 return igmpv3_sendpack(skb);
548}
549
550/*
551 * remove zero-count source records from a source filter list
552 */
553static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
554{
555 struct ip_sf_list *psf_prev, *psf_next, *psf;
556
557 psf_prev = NULL;
558 for (psf=*ppsf; psf; psf = psf_next) {
559 psf_next = psf->sf_next;
560 if (psf->sf_crcount == 0) {
561 if (psf_prev)
562 psf_prev->sf_next = psf->sf_next;
563 else
564 *ppsf = psf->sf_next;
565 kfree(psf);
566 } else
567 psf_prev = psf;
568 }
569}
570
571static void igmpv3_send_cr(struct in_device *in_dev)
572{
573 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
574 struct sk_buff *skb = NULL;
575 int type, dtype;
576
1d7138de 577 rcu_read_lock();
1da177e4
LT		 578 spin_lock_bh(&in_dev->mc_tomb_lock);
579
580 /* deleted MCA's */
581 pmc_prev = NULL;
582 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
583 pmc_next = pmc->next;
584 if (pmc->sfmode == MCAST_INCLUDE) {
585 type = IGMPV3_BLOCK_OLD_SOURCES;
586 dtype = IGMPV3_BLOCK_OLD_SOURCES;
587 skb = add_grec(skb, pmc, type, 1, 0);
588 skb = add_grec(skb, pmc, dtype, 1, 1);
589 }
590 if (pmc->crcount) {
1da177e4
LT		 591 if (pmc->sfmode == MCAST_EXCLUDE) {
592 type = IGMPV3_CHANGE_TO_INCLUDE;
593 skb = add_grec(skb, pmc, type, 1, 0);
594 }
ad12583f 595 pmc->crcount--;
1da177e4
LT		 596 if (pmc->crcount == 0) {
597 igmpv3_clear_zeros(&pmc->tomb);
598 igmpv3_clear_zeros(&pmc->sources);
599 }
600 }
601 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
602 if (pmc_prev)
603 pmc_prev->next = pmc_next;
604 else
605 in_dev->mc_tomb = pmc_next;
606 in_dev_put(pmc->interface);
607 kfree(pmc);
608 } else
609 pmc_prev = pmc;
610 }
611 spin_unlock_bh(&in_dev->mc_tomb_lock);
612
613 /* change recs */
1d7138de 614 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 615 spin_lock_bh(&pmc->lock);
616 if (pmc->sfcount[MCAST_EXCLUDE]) {
617 type = IGMPV3_BLOCK_OLD_SOURCES;
618 dtype = IGMPV3_ALLOW_NEW_SOURCES;
619 } else {
620 type = IGMPV3_ALLOW_NEW_SOURCES;
621 dtype = IGMPV3_BLOCK_OLD_SOURCES;
622 }
623 skb = add_grec(skb, pmc, type, 0, 0);
624 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
625
626 /* filter mode changes */
627 if (pmc->crcount) {
1da177e4
LT		 628 if (pmc->sfmode == MCAST_EXCLUDE)
629 type = IGMPV3_CHANGE_TO_EXCLUDE;
630 else
631 type = IGMPV3_CHANGE_TO_INCLUDE;
632 skb = add_grec(skb, pmc, type, 0, 0);
ad12583f 633 pmc->crcount--;
1da177e4
LT		 634 }
635 spin_unlock_bh(&pmc->lock);
636 }
1d7138de 637 rcu_read_unlock();
1da177e4
LT		 638
639 if (!skb)
640 return;
641 (void) igmpv3_sendpack(skb);
642}
643
644static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
645 int type)
646{
647 struct sk_buff *skb;
648 struct iphdr *iph;
649 struct igmphdr *ih;
650 struct rtable *rt;
651 struct net_device *dev = in_dev->dev;
877acedc 652 struct net *net = dev_net(dev);
63007727 653 __be32 group = pmc ? pmc->multiaddr : 0;
31e4543d 654 struct flowi4 fl4;
63007727 655 __be32 dst;
66088243 656 int hlen, tlen;
1da177e4
LT		 657
658 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
659 return igmpv3_send_report(in_dev, pmc);
660 else if (type == IGMP_HOST_LEAVE_MESSAGE)
661 dst = IGMP_ALL_ROUTER;
662 else
663 dst = group;
664
31e4543d 665 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
78fbfd8a
DM		 666 0, 0,
667 IPPROTO_IGMP, 0, dev->ifindex);
668 if (IS_ERR(rt))
669 return -1;
670
66088243
HX		 671 hlen = LL_RESERVED_SPACE(dev);
672 tlen = dev->needed_tailroom;
673 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
1da177e4
LT		 674 if (skb == NULL) {
675 ip_rt_put(rt);
676 return -1;
677 }
678
d8d1f30b 679 skb_dst_set(skb, &rt->dst);
1da177e4 680
66088243 681 skb_reserve(skb, hlen);
1da177e4 682
7e28ecc2 683 skb_reset_network_header(skb);
eddc9ec5 684 iph = ip_hdr(skb);
7e28ecc2 685 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 686
687 iph->version = 4;
688 iph->ihl = (sizeof(struct iphdr)+4)>>2;
689 iph->tos = 0xc0;
690 iph->frag_off = htons(IP_DF);
691 iph->ttl = 1;
692 iph->daddr = dst;
492f64ce 693 iph->saddr = fl4.saddr;
1da177e4 694 iph->protocol = IPPROTO_IGMP;
ff1f69a8 695 ip_select_ident(skb, NULL);
5e73ea1a
DB		 696 ((u8 *)&iph[1])[0] = IPOPT_RA;
697 ((u8 *)&iph[1])[1] = 4;
698 ((u8 *)&iph[1])[2] = 0;
699 ((u8 *)&iph[1])[3] = 0;
1da177e4
LT		 700
701 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
a7e9ff73
JK		 702 ih->type = type;
703 ih->code = 0;
704 ih->csum = 0;
705 ih->group = group;
706 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
1da177e4 707
c439cb2e 708 return ip_local_out(skb);
1da177e4
LT		 709}
710
711static void igmp_gq_timer_expire(unsigned long data)
712{
713 struct in_device *in_dev = (struct in_device *)data;
714
715 in_dev->mr_gq_running = 0;
716 igmpv3_send_report(in_dev, NULL);
fbf96d75 717 in_dev_put(in_dev);
1da177e4
LT		 718}
719
720static void igmp_ifc_timer_expire(unsigned long data)
721{
722 struct in_device *in_dev = (struct in_device *)data;
723
724 igmpv3_send_cr(in_dev);
725 if (in_dev->mr_ifc_count) {
726 in_dev->mr_ifc_count--;
727 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
728 }
fbf96d75 729 in_dev_put(in_dev);
1da177e4
LT		 730}
731
732static void igmp_ifc_event(struct in_device *in_dev)
733{
734 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
735 return;
e905a9ed 736 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 737 IGMP_Unsolicited_Report_Count;
738 igmp_ifc_start_timer(in_dev, 1);
739}
740
741
742static void igmp_timer_expire(unsigned long data)
743{
744 struct ip_mc_list *im=(struct ip_mc_list *)data;
745 struct in_device *in_dev = im->interface;
746
747 spin_lock(&im->lock);
a7e9ff73 748 im->tm_running = 0;
1da177e4
LT		 749
750 if (im->unsolicit_count) {
751 im->unsolicit_count--;
752 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
753 }
754 im->reporter = 1;
755 spin_unlock(&im->lock);
756
757 if (IGMP_V1_SEEN(in_dev))
758 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
759 else if (IGMP_V2_SEEN(in_dev))
760 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
761 else
762 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
763
764 ip_ma_put(im);
765}
766
ad12583f 767/* mark EXCLUDE-mode sources */
ea4d9e72 768static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 769{
770 struct ip_sf_list *psf;
771 int i, scount;
772
ad12583f
DS		 773 scount = 0;
774 for (psf=pmc->sources; psf; psf=psf->sf_next) {
775 if (scount == nsrcs)
776 break;
777 for (i=0; i<nsrcs; i++) {
778 /* skip inactive filters */
e05c4ad3 779 if (psf->sf_count[MCAST_INCLUDE] ||
ad12583f
DS		 780 pmc->sfcount[MCAST_EXCLUDE] !=
781 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 782 break;
ad12583f
DS		 783 if (srcs[i] == psf->sf_inaddr) {
784 scount++;
785 break;
786 }
787 }
788 }
789 pmc->gsquery = 0;
790 if (scount == nsrcs) /* all sources excluded */
791 return 0;
792 return 1;
793}
794
ea4d9e72 795static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 796{
797 struct ip_sf_list *psf;
798 int i, scount;
799
800 if (pmc->sfmode == MCAST_EXCLUDE)
801 return igmp_xmarksources(pmc, nsrcs, srcs);
802
803 /* mark INCLUDE-mode sources */
1da177e4
LT		 804 scount = 0;
805 for (psf=pmc->sources; psf; psf=psf->sf_next) {
806 if (scount == nsrcs)
807 break;
808 for (i=0; i<nsrcs; i++)
809 if (srcs[i] == psf->sf_inaddr) {
810 psf->sf_gsresp = 1;
811 scount++;
812 break;
813 }
814 }
ad12583f
DS		 815 if (!scount) {
816 pmc->gsquery = 0;
817 return 0;
818 }
819 pmc->gsquery = 1;
820 return 1;
1da177e4
LT		 821}
822
d679c532
ED		 823/* return true if packet was dropped */
824static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 825{
826 struct ip_mc_list *im;
827
828 /* Timers are only set for non-local groups */
829
830 if (group == IGMP_ALL_HOSTS)
d679c532 831 return false;
1da177e4 832
1d7138de
ED		 833 rcu_read_lock();
834 for_each_pmc_rcu(in_dev, im) {
1da177e4
LT		 835 if (im->multiaddr == group) {
836 igmp_stop_timer(im);
837 break;
838 }
839 }
1d7138de 840 rcu_read_unlock();
d679c532 841 return false;
1da177e4
LT		 842}
843
d679c532
ED		 844/* return true if packet was dropped */
845static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
1da177e4
LT		 846 int len)
847{
d9edf9e2
ACM		 848 struct igmphdr *ih = igmp_hdr(skb);
849 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
1da177e4 850 struct ip_mc_list *im;
63007727 851 __be32 group = ih->group;
1da177e4
LT		 852 int max_delay;
853 int mark = 0;
854
855
5b7c8406 856 if (len == 8) {
1da177e4
LT		 857 if (ih->code == 0) {
858 /* Alas, old v1 router presents here. */
e905a9ed 859
1da177e4
LT		 860 max_delay = IGMP_Query_Response_Interval;
861 in_dev->mr_v1_seen = jiffies +
862 IGMP_V1_Router_Present_Timeout;
863 group = 0;
864 } else {
865 /* v2 router present */
866 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
867 in_dev->mr_v2_seen = jiffies +
868 IGMP_V2_Router_Present_Timeout;
869 }
870 /* cancel the interface change timer */
871 in_dev->mr_ifc_count = 0;
872 if (del_timer(&in_dev->mr_ifc_timer))
873 __in_dev_put(in_dev);
874 /* clear deleted report items */
875 igmpv3_clear_delrec(in_dev);
876 } else if (len < 12) {
d679c532 877 return true; /* ignore bogus packet; freed by caller */
5b7c8406
DS		 878 } else if (IGMP_V1_SEEN(in_dev)) {
879 /* This is a v3 query with v1 queriers present */
880 max_delay = IGMP_Query_Response_Interval;
881 group = 0;
882 } else if (IGMP_V2_SEEN(in_dev)) {
883 /* this is a v3 query with v2 queriers present;
884 * Interpretation of the max_delay code is problematic here.
885 * A real v2 host would use ih_code directly, while v3 has a
886 * different encoding. We use the v3 encoding as more likely
887 * to be intended in a v3 query.
888 */
889 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
a8c1f65c
BH		 890 if (!max_delay)
891 max_delay = 1; /* can't mod w/ 0 */
1da177e4
LT		 892 } else { /* v3 */
893 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
d679c532 894 return true;
e905a9ed 895
d9edf9e2 896 ih3 = igmpv3_query_hdr(skb);
1da177e4 897 if (ih3->nsrcs) {
e905a9ed 898 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 899 + ntohs(ih3->nsrcs)*sizeof(__be32)))
d679c532 900 return true;
d9edf9e2 901 ih3 = igmpv3_query_hdr(skb);
1da177e4
LT		 902 }
903
904 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
905 if (!max_delay)
906 max_delay = 1; /* can't mod w/ 0 */
907 in_dev->mr_maxdelay = max_delay;
908 if (ih3->qrv)
909 in_dev->mr_qrv = ih3->qrv;
910 if (!group) { /* general query */
911 if (ih3->nsrcs)
d679c532 912 return false; /* no sources allowed */
1da177e4 913 igmp_gq_start_timer(in_dev);
d679c532 914 return false;
1da177e4
LT		 915 }
916 /* mark sources to include, if group & source-specific */
917 mark = ih3->nsrcs != 0;
918 }
919
920 /*
921 * - Start the timers in all of our membership records
922 * that the query applies to for the interface on
923 * which the query arrived excl. those that belong
924 * to a "local" group (224.0.0.X)
925 * - For timers already running check if they need to
926 * be reset.
927 * - Use the igmp->igmp_code field as the maximum
928 * delay possible
929 */
1d7138de
ED		 930 rcu_read_lock();
931 for_each_pmc_rcu(in_dev, im) {
ad12583f
DS		 932 int changed;
933
1da177e4
LT		 934 if (group && group != im->multiaddr)
935 continue;
936 if (im->multiaddr == IGMP_ALL_HOSTS)
937 continue;
938 spin_lock_bh(&im->lock);
939 if (im->tm_running)
940 im->gsquery = im->gsquery && mark;
941 else
942 im->gsquery = mark;
ad12583f 943 changed = !im->gsquery ||
e905a9ed 944 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 945 spin_unlock_bh(&im->lock);
ad12583f
DS		 946 if (changed)
947 igmp_mod_timer(im, max_delay);
1da177e4 948 }
1d7138de 949 rcu_read_unlock();
d679c532 950 return false;
1da177e4
LT		 951}
952
9a57a9d2 953/* called in rcu_read_lock() section */
1da177e4
LT		 954int igmp_rcv(struct sk_buff *skb)
955{
956 /* This basically follows the spec line by line -- see RFC1112 */
957 struct igmphdr *ih;
9a57a9d2 958 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1da177e4 959 int len = skb->len;
d679c532 960 bool dropped = true;
1da177e4 961
cd557bc1
DL		 962 if (in_dev == NULL)
963 goto drop;
1da177e4 964
fb286bb2 965 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
9a57a9d2 966 goto drop;
fb286bb2
HX		 967
968 switch (skb->ip_summed) {
84fa7933 969 case CHECKSUM_COMPLETE:
d3bc23e7 970 if (!csum_fold(skb->csum))
fb286bb2
HX		 971 break;
972 /* fall through */
973 case CHECKSUM_NONE:
974 skb->csum = 0;
975 if (__skb_checksum_complete(skb))
9a57a9d2 976 goto drop;
1da177e4
LT		 977 }
978
d9edf9e2 979 ih = igmp_hdr(skb);
1da177e4
LT		 980 switch (ih->type) {
981 case IGMP_HOST_MEMBERSHIP_QUERY:
d679c532 982 dropped = igmp_heard_query(in_dev, skb, len);
1da177e4
LT		 983 break;
984 case IGMP_HOST_MEMBERSHIP_REPORT:
985 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1da177e4 986 /* Is it our report looped back? */
c7537967 987 if (rt_is_output_route(skb_rtable(skb)))
1da177e4 988 break;
24c69275
DS		 989 /* don't rely on MC router hearing unicast reports */
990 if (skb->pkt_type == PACKET_MULTICAST ||
991 skb->pkt_type == PACKET_BROADCAST)
d679c532 992 dropped = igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 993 break;
994 case IGMP_PIM:
995#ifdef CONFIG_IP_PIMSM_V1
1da177e4
LT		 996 return pim_rcv_v1(skb);
997#endif
c6b471e6 998 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1da177e4
LT		 999 case IGMP_DVMRP:
1000 case IGMP_TRACE:
1001 case IGMP_HOST_LEAVE_MESSAGE:
1002 case IGMP_MTRACE:
1003 case IGMP_MTRACE_RESP:
1004 break;
1005 default:
dd1c1853 1006 break;
1da177e4 1007 }
fb286bb2 1008
cd557bc1 1009drop:
d679c532
ED		 1010 if (dropped)
1011 kfree_skb(skb);
1012 else
1013 consume_skb(skb);
1da177e4
LT		 1014 return 0;
1015}
1016
1017#endif
1018
1019
1020/*
1021 * Add a filter to a device
1022 */
1023
63007727 1024static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1025{
1026 char buf[MAX_ADDR_LEN];
1027 struct net_device *dev = in_dev->dev;
1028
1029 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1030 We will get multicast token leakage, when IFF_MULTICAST
b81693d9 1031 is changed. This check should be done in ndo_set_rx_mode
1da177e4
LT		 1032 routine. Something sort of:
1033 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1034 --ANK
1035 */
1036 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1037 dev_mc_add(dev, buf);
1da177e4
LT		 1038}
1039
1040/*
1041 * Remove a filter from a device
1042 */
1043
63007727 1044static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1045{
1046 char buf[MAX_ADDR_LEN];
1047 struct net_device *dev = in_dev->dev;
1048
1049 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1050 dev_mc_del(dev, buf);
1da177e4
LT		 1051}
1052
1053#ifdef CONFIG_IP_MULTICAST
1054/*
1055 * deleted ip_mc_list manipulation
1056 */
1057static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1058{
1059 struct ip_mc_list *pmc;
1060
1061 /* this is an "ip_mc_list" for convenience; only the fields below
1062 * are actually used. In particular, the refcnt and users are not
1063 * used for management of the delete list. Using the same structure
1064 * for deleted items allows change reports to use common code with
1065 * non-deleted or query-response MCA's.
1066 */
0da974f4 1067 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1068 if (!pmc)
1069 return;
1da177e4
LT		 1070 spin_lock_bh(&im->lock);
1071 pmc->interface = im->interface;
1072 in_dev_hold(in_dev);
1073 pmc->multiaddr = im->multiaddr;
1074 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1075 IGMP_Unsolicited_Report_Count;
1076 pmc->sfmode = im->sfmode;
1077 if (pmc->sfmode == MCAST_INCLUDE) {
1078 struct ip_sf_list *psf;
1079
1080 pmc->tomb = im->tomb;
1081 pmc->sources = im->sources;
1082 im->tomb = im->sources = NULL;
1083 for (psf=pmc->sources; psf; psf=psf->sf_next)
1084 psf->sf_crcount = pmc->crcount;
1085 }
1086 spin_unlock_bh(&im->lock);
1087
1088 spin_lock_bh(&in_dev->mc_tomb_lock);
1089 pmc->next = in_dev->mc_tomb;
1090 in_dev->mc_tomb = pmc;
1091 spin_unlock_bh(&in_dev->mc_tomb_lock);
1092}
1093
63007727 1094static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1095{
1096 struct ip_mc_list *pmc, *pmc_prev;
1097 struct ip_sf_list *psf, *psf_next;
1098
1099 spin_lock_bh(&in_dev->mc_tomb_lock);
1100 pmc_prev = NULL;
1101 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1102 if (pmc->multiaddr == multiaddr)
1103 break;
1104 pmc_prev = pmc;
1105 }
1106 if (pmc) {
1107 if (pmc_prev)
1108 pmc_prev->next = pmc->next;
1109 else
1110 in_dev->mc_tomb = pmc->next;
1111 }
1112 spin_unlock_bh(&in_dev->mc_tomb_lock);
1113 if (pmc) {
1114 for (psf=pmc->tomb; psf; psf=psf_next) {
1115 psf_next = psf->sf_next;
1116 kfree(psf);
1117 }
1118 in_dev_put(pmc->interface);
1119 kfree(pmc);
1120 }
1121}
1122
1123static void igmpv3_clear_delrec(struct in_device *in_dev)
1124{
1125 struct ip_mc_list *pmc, *nextpmc;
1126
1127 spin_lock_bh(&in_dev->mc_tomb_lock);
1128 pmc = in_dev->mc_tomb;
1129 in_dev->mc_tomb = NULL;
1130 spin_unlock_bh(&in_dev->mc_tomb_lock);
1131
1132 for (; pmc; pmc = nextpmc) {
1133 nextpmc = pmc->next;
1134 ip_mc_clear_src(pmc);
1135 in_dev_put(pmc->interface);
1136 kfree(pmc);
1137 }
1138 /* clear dead sources, too */
1d7138de
ED		 1139 rcu_read_lock();
1140 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1141 struct ip_sf_list *psf, *psf_next;
1142
1143 spin_lock_bh(&pmc->lock);
1144 psf = pmc->tomb;
1145 pmc->tomb = NULL;
1146 spin_unlock_bh(&pmc->lock);
1147 for (; psf; psf=psf_next) {
1148 psf_next = psf->sf_next;
1149 kfree(psf);
1150 }
1151 }
1d7138de 1152 rcu_read_unlock();
1da177e4
LT		 1153}
1154#endif
1155
1156static void igmp_group_dropped(struct ip_mc_list *im)
1157{
1158 struct in_device *in_dev = im->interface;
1159#ifdef CONFIG_IP_MULTICAST
1160 int reporter;
1161#endif
1162
1163 if (im->loaded) {
1164 im->loaded = 0;
1165 ip_mc_filter_del(in_dev, im->multiaddr);
1166 }
1167
1168#ifdef CONFIG_IP_MULTICAST
1169 if (im->multiaddr == IGMP_ALL_HOSTS)
1170 return;
1171
1172 reporter = im->reporter;
1173 igmp_stop_timer(im);
1174
1175 if (!in_dev->dead) {
1176 if (IGMP_V1_SEEN(in_dev))
24cf3af3 1177 return;
1da177e4
LT		 1178 if (IGMP_V2_SEEN(in_dev)) {
1179 if (reporter)
1180 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
24cf3af3 1181 return;
1da177e4
LT		 1182 }
1183 /* IGMPv3 */
1184 igmpv3_add_delrec(in_dev, im);
1185
1186 igmp_ifc_event(in_dev);
1187 }
1da177e4 1188#endif
1da177e4
LT		 1189}
1190
1191static void igmp_group_added(struct ip_mc_list *im)
1192{
1193 struct in_device *in_dev = im->interface;
1194
1195 if (im->loaded == 0) {
1196 im->loaded = 1;
1197 ip_mc_filter_add(in_dev, im->multiaddr);
1198 }
1199
1200#ifdef CONFIG_IP_MULTICAST
1201 if (im->multiaddr == IGMP_ALL_HOSTS)
1202 return;
1203
1204 if (in_dev->dead)
1205 return;
1206 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1207 spin_lock_bh(&im->lock);
1208 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1209 spin_unlock_bh(&im->lock);
1210 return;
1211 }
1212 /* else, v3 */
1213
1214 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1215 IGMP_Unsolicited_Report_Count;
1216 igmp_ifc_event(in_dev);
1217#endif
1218}
1219
1220
1221/*
1222 * Multicast list managers
1223 */
1224
1225
1226/*
1227 * A socket has joined a multicast group on device dev.
1228 */
1229
8f935bbd 1230void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1231{
1232 struct ip_mc_list *im;
1233
1234 ASSERT_RTNL();
1235
1d7138de 1236 for_each_pmc_rtnl(in_dev, im) {
1da177e4
LT		 1237 if (im->multiaddr == addr) {
1238 im->users++;
1239 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1240 goto out;
1241 }
1242 }
1243
1d7138de 1244 im = kzalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1245 if (!im)
1246 goto out;
1247
a7e9ff73
JK		 1248 im->users = 1;
1249 im->interface = in_dev;
1da177e4 1250 in_dev_hold(in_dev);
a7e9ff73 1251 im->multiaddr = addr;
1da177e4
LT		 1252 /* initial mode is (EX, empty) */
1253 im->sfmode = MCAST_EXCLUDE;
1da177e4 1254 im->sfcount[MCAST_EXCLUDE] = 1;
1da177e4
LT		 1255 atomic_set(&im->refcnt, 1);
1256 spin_lock_init(&im->lock);
1257#ifdef CONFIG_IP_MULTICAST
b24b8a24 1258 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1da177e4 1259 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1da177e4 1260#endif
1d7138de
ED		 1261
1262 im->next_rcu = in_dev->mc_list;
b8bae41e 1263 in_dev->mc_count++;
cf778b00 1264 rcu_assign_pointer(in_dev->mc_list, im);
1d7138de 1265
1da177e4
LT		 1266#ifdef CONFIG_IP_MULTICAST
1267 igmpv3_del_delrec(in_dev, im->multiaddr);
1268#endif
1269 igmp_group_added(im);
1270 if (!in_dev->dead)
1271 ip_rt_multicast_event(in_dev);
1272out:
1273 return;
1274}
4bc2f18b 1275EXPORT_SYMBOL(ip_mc_inc_group);
1da177e4 1276
a816c7c7
JV		 1277/*
1278 * Resend IGMP JOIN report; used for bonding.
866f3b25 1279 * Called with rcu_read_lock()
a816c7c7 1280 */
866f3b25 1281void ip_mc_rejoin_groups(struct in_device *in_dev)
a816c7c7 1282{
08882669 1283#ifdef CONFIG_IP_MULTICAST
866f3b25
ED		 1284 struct ip_mc_list *im;
1285 int type;
a816c7c7 1286
866f3b25
ED		 1287 for_each_pmc_rcu(in_dev, im) {
1288 if (im->multiaddr == IGMP_ALL_HOSTS)
1289 continue;
a816c7c7 1290
866f3b25
ED		 1291 /* a failover is happening and switches
1292 * must be notified immediately
1293 */
1294 if (IGMP_V1_SEEN(in_dev))
1295 type = IGMP_HOST_MEMBERSHIP_REPORT;
1296 else if (IGMP_V2_SEEN(in_dev))
1297 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1298 else
1299 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1300 igmp_send_report(in_dev, im, type);
1301 }
a816c7c7
JV		 1302#endif
1303}
866f3b25 1304EXPORT_SYMBOL(ip_mc_rejoin_groups);
a816c7c7 1305
1da177e4
LT		 1306/*
1307 * A socket has left a multicast group on device dev
1308 */
1309
8f935bbd 1310void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1da177e4 1311{
1d7138de
ED		 1312 struct ip_mc_list *i;
1313 struct ip_mc_list __rcu **ip;
e905a9ed 1314
1da177e4 1315 ASSERT_RTNL();
e905a9ed 1316
1d7138de
ED		 1317 for (ip = &in_dev->mc_list;
1318 (i = rtnl_dereference(*ip)) != NULL;
1319 ip = &i->next_rcu) {
a7e9ff73 1320 if (i->multiaddr == addr) {
1da177e4 1321 if (--i->users == 0) {
1d7138de 1322 *ip = i->next_rcu;
b8bae41e 1323 in_dev->mc_count--;
1da177e4 1324 igmp_group_dropped(i);
24cf3af3 1325 ip_mc_clear_src(i);
1da177e4
LT		 1326
1327 if (!in_dev->dead)
1328 ip_rt_multicast_event(in_dev);
1329
1330 ip_ma_put(i);
1331 return;
1332 }
1333 break;
1334 }
1335 }
1336}
4bc2f18b 1337EXPORT_SYMBOL(ip_mc_dec_group);
1da177e4 1338
75c78500
MS		 1339/* Device changing type */
1340
1341void ip_mc_unmap(struct in_device *in_dev)
1342{
1d7138de 1343 struct ip_mc_list *pmc;
75c78500
MS		 1344
1345 ASSERT_RTNL();
1346
1d7138de
ED		 1347 for_each_pmc_rtnl(in_dev, pmc)
1348 igmp_group_dropped(pmc);
75c78500
MS		 1349}
1350
1351void ip_mc_remap(struct in_device *in_dev)
1352{
1d7138de 1353 struct ip_mc_list *pmc;
75c78500
MS		 1354
1355 ASSERT_RTNL();
1356
1d7138de
ED		 1357 for_each_pmc_rtnl(in_dev, pmc)
1358 igmp_group_added(pmc);
75c78500
MS		 1359}
1360
1da177e4
LT		 1361/* Device going down */
1362
1363void ip_mc_down(struct in_device *in_dev)
1364{
1d7138de 1365 struct ip_mc_list *pmc;
1da177e4
LT		 1366
1367 ASSERT_RTNL();
1368
1d7138de
ED		 1369 for_each_pmc_rtnl(in_dev, pmc)
1370 igmp_group_dropped(pmc);
1da177e4
LT		 1371
1372#ifdef CONFIG_IP_MULTICAST
1373 in_dev->mr_ifc_count = 0;
1374 if (del_timer(&in_dev->mr_ifc_timer))
1375 __in_dev_put(in_dev);
1376 in_dev->mr_gq_running = 0;
1377 if (del_timer(&in_dev->mr_gq_timer))
1378 __in_dev_put(in_dev);
1379 igmpv3_clear_delrec(in_dev);
1380#endif
1381
1382 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1383}
1384
1385void ip_mc_init_dev(struct in_device *in_dev)
1386{
1387 ASSERT_RTNL();
1388
1389 in_dev->mc_tomb = NULL;
1390#ifdef CONFIG_IP_MULTICAST
1391 in_dev->mr_gq_running = 0;
b24b8a24
PE		 1392 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1393 (unsigned long)in_dev);
1da177e4 1394 in_dev->mr_ifc_count = 0;
b8bae41e 1395 in_dev->mc_count = 0;
b24b8a24
PE		 1396 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1397 (unsigned long)in_dev);
1da177e4
LT		 1398 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1399#endif
1400
1da177e4
LT		 1401 spin_lock_init(&in_dev->mc_tomb_lock);
1402}
1403
1404/* Device going up */
1405
1406void ip_mc_up(struct in_device *in_dev)
1407{
1d7138de 1408 struct ip_mc_list *pmc;
1da177e4
LT		 1409
1410 ASSERT_RTNL();
1411
1412 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1413
1d7138de
ED		 1414 for_each_pmc_rtnl(in_dev, pmc)
1415 igmp_group_added(pmc);
1da177e4
LT		 1416}
1417
1418/*
1419 * Device is about to be destroyed: clean up.
1420 */
1421
1422void ip_mc_destroy_dev(struct in_device *in_dev)
1423{
1424 struct ip_mc_list *i;
1425
1426 ASSERT_RTNL();
1427
1428 /* Deactivate timers */
1429 ip_mc_down(in_dev);
1430
1d7138de
ED		 1431 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1432 in_dev->mc_list = i->next_rcu;
b8bae41e 1433 in_dev->mc_count--;
1d7138de 1434
24cf3af3
VF		 1435 /* We've dropped the groups in ip_mc_down already */
1436 ip_mc_clear_src(i);
1da177e4 1437 ip_ma_put(i);
1da177e4 1438 }
1da177e4
LT		 1439}
1440
9e917dca 1441/* RTNL is locked */
877acedc 1442static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1da177e4 1443{
1da177e4
LT		 1444 struct net_device *dev = NULL;
1445 struct in_device *idev = NULL;
1446
1447 if (imr->imr_ifindex) {
877acedc 1448 idev = inetdev_by_index(net, imr->imr_ifindex);
1da177e4
LT		 1449 return idev;
1450 }
1451 if (imr->imr_address.s_addr) {
9e917dca 1452 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1da177e4
LT		 1453 if (!dev)
1454 return NULL;
1da177e4
LT		 1455 }
1456
b23dd4fe 1457 if (!dev) {
78fbfd8a
DM		 1458 struct rtable *rt = ip_route_output(net,
1459 imr->imr_multiaddr.s_addr,
1460 0, 0, 0);
b23dd4fe
DM		 1461 if (!IS_ERR(rt)) {
1462 dev = rt->dst.dev;
1463 ip_rt_put(rt);
1464 }
1da177e4
LT		 1465 }
1466 if (dev) {
1467 imr->imr_ifindex = dev->ifindex;
e5ed6399 1468 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1469 }
1470 return idev;
1471}
1472
1473/*
1474 * Join a socket to a group
1475 */
ab32ea5d
BH		 1476int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1477int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1da177e4
LT		 1478
1479
1480static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1481 __be32 *psfsrc)
1da177e4
LT		 1482{
1483 struct ip_sf_list *psf, *psf_prev;
1484 int rv = 0;
1485
1486 psf_prev = NULL;
1487 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1488 if (psf->sf_inaddr == *psfsrc)
1489 break;
1490 psf_prev = psf;
1491 }
1492 if (!psf || psf->sf_count[sfmode] == 0) {
1493 /* source filter not found, or count wrong => bug */
1494 return -ESRCH;
1495 }
1496 psf->sf_count[sfmode]--;
1497 if (psf->sf_count[sfmode] == 0) {
1498 ip_rt_multicast_event(pmc->interface);
1499 }
1500 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1501#ifdef CONFIG_IP_MULTICAST
1502 struct in_device *in_dev = pmc->interface;
1503#endif
1504
1505 /* no more filters for this source */
1506 if (psf_prev)
1507 psf_prev->sf_next = psf->sf_next;
1508 else
1509 pmc->sources = psf->sf_next;
1510#ifdef CONFIG_IP_MULTICAST
1511 if (psf->sf_oldin &&
1512 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
e905a9ed 1513 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1514 IGMP_Unsolicited_Report_Count;
1515 psf->sf_next = pmc->tomb;
1516 pmc->tomb = psf;
1517 rv = 1;
1518 } else
1519#endif
1520 kfree(psf);
1521 }
1522 return rv;
1523}
1524
1525#ifndef CONFIG_IP_MULTICAST
1526#define igmp_ifc_event(x) do { } while (0)
1527#endif
1528
8f935bbd
AV		 1529static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1530 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1531{
1532 struct ip_mc_list *pmc;
1533 int changerec = 0;
1534 int i, err;
1535
1536 if (!in_dev)
1537 return -ENODEV;
1d7138de
ED		 1538 rcu_read_lock();
1539 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1540 if (*pmca == pmc->multiaddr)
1541 break;
1542 }
1543 if (!pmc) {
1544 /* MCA not found?? bug */
1d7138de 1545 rcu_read_unlock();
1da177e4
LT		 1546 return -ESRCH;
1547 }
1548 spin_lock_bh(&pmc->lock);
1d7138de 1549 rcu_read_unlock();
1da177e4
LT		 1550#ifdef CONFIG_IP_MULTICAST
1551 sf_markstate(pmc);
1552#endif
1553 if (!delta) {
1554 err = -EINVAL;
1555 if (!pmc->sfcount[sfmode])
1556 goto out_unlock;
1557 pmc->sfcount[sfmode]--;
1558 }
1559 err = 0;
1560 for (i=0; i<sfcount; i++) {
1561 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1562
1563 changerec |= rv > 0;
1564 if (!err && rv < 0)
1565 err = rv;
1566 }
1567 if (pmc->sfmode == MCAST_EXCLUDE &&
1568 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1569 pmc->sfcount[MCAST_INCLUDE]) {
1570#ifdef CONFIG_IP_MULTICAST
1571 struct ip_sf_list *psf;
1572#endif
1573
1574 /* filter mode change */
1575 pmc->sfmode = MCAST_INCLUDE;
1576#ifdef CONFIG_IP_MULTICAST
e905a9ed 1577 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1578 IGMP_Unsolicited_Report_Count;
1579 in_dev->mr_ifc_count = pmc->crcount;
1580 for (psf=pmc->sources; psf; psf = psf->sf_next)
1581 psf->sf_crcount = 0;
1582 igmp_ifc_event(pmc->interface);
1583 } else if (sf_setstate(pmc) || changerec) {
1584 igmp_ifc_event(pmc->interface);
1585#endif
1586 }
1587out_unlock:
1588 spin_unlock_bh(&pmc->lock);
1589 return err;
1590}
1591
1592/*
1593 * Add multicast single-source filter to the interface list
1594 */
1595static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
5eb81e89 1596 __be32 *psfsrc)
1da177e4
LT		 1597{
1598 struct ip_sf_list *psf, *psf_prev;
1599
1600 psf_prev = NULL;
1601 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1602 if (psf->sf_inaddr == *psfsrc)
1603 break;
1604 psf_prev = psf;
1605 }
1606 if (!psf) {
0da974f4 1607 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1608 if (!psf)
1609 return -ENOBUFS;
1da177e4
LT		 1610 psf->sf_inaddr = *psfsrc;
1611 if (psf_prev) {
1612 psf_prev->sf_next = psf;
1613 } else
1614 pmc->sources = psf;
1615 }
1616 psf->sf_count[sfmode]++;
1617 if (psf->sf_count[sfmode] == 1) {
1618 ip_rt_multicast_event(pmc->interface);
1619 }
1620 return 0;
1621}
1622
1623#ifdef CONFIG_IP_MULTICAST
1624static void sf_markstate(struct ip_mc_list *pmc)
1625{
1626 struct ip_sf_list *psf;
1627 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1628
1629 for (psf=pmc->sources; psf; psf=psf->sf_next)
1630 if (pmc->sfcount[MCAST_EXCLUDE]) {
1631 psf->sf_oldin = mca_xcount ==
1632 psf->sf_count[MCAST_EXCLUDE] &&
1633 !psf->sf_count[MCAST_INCLUDE];
1634 } else
1635 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1636}
1637
1638static int sf_setstate(struct ip_mc_list *pmc)
1639{
ad12583f 1640 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1641 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1642 int qrv = pmc->interface->mr_qrv;
1643 int new_in, rv;
1644
1645 rv = 0;
1646 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1647 if (pmc->sfcount[MCAST_EXCLUDE]) {
1648 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1649 !psf->sf_count[MCAST_INCLUDE];
1650 } else
1651 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1652 if (new_in) {
1653 if (!psf->sf_oldin) {
76edc605 1654 struct ip_sf_list *prev = NULL;
ad12583f
DS		 1655
1656 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1657 if (dpsf->sf_inaddr == psf->sf_inaddr)
1658 break;
1659 prev = dpsf;
1660 }
1661 if (dpsf) {
1662 if (prev)
1663 prev->sf_next = dpsf->sf_next;
1664 else
1665 pmc->tomb = dpsf->sf_next;
1666 kfree(dpsf);
1667 }
1668 psf->sf_crcount = qrv;
1669 rv++;
1670 }
1671 } else if (psf->sf_oldin) {
1672
1673 psf->sf_crcount = 0;
1674 /*
1675 * add or update "delete" records if an active filter
1676 * is now inactive
1677 */
1678 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1679 if (dpsf->sf_inaddr == psf->sf_inaddr)
1680 break;
1681 if (!dpsf) {
3ed37a6f 1682 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
ad12583f
DS		 1683 if (!dpsf)
1684 continue;
1685 *dpsf = *psf;
1686 /* pmc->lock held by callers */
1687 dpsf->sf_next = pmc->tomb;
1688 pmc->tomb = dpsf;
1689 }
1690 dpsf->sf_crcount = qrv;
1da177e4
LT		 1691 rv++;
1692 }
1693 }
1694 return rv;
1695}
1696#endif
1697
1698/*
1699 * Add multicast source filter list to the interface list
1700 */
8f935bbd
AV		 1701static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1702 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1703{
1704 struct ip_mc_list *pmc;
1705 int isexclude;
1706 int i, err;
1707
1708 if (!in_dev)
1709 return -ENODEV;
1d7138de
ED		 1710 rcu_read_lock();
1711 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1712 if (*pmca == pmc->multiaddr)
1713 break;
1714 }
1715 if (!pmc) {
1716 /* MCA not found?? bug */
1d7138de 1717 rcu_read_unlock();
1da177e4
LT		 1718 return -ESRCH;
1719 }
1720 spin_lock_bh(&pmc->lock);
1d7138de 1721 rcu_read_unlock();
1da177e4
LT		 1722
1723#ifdef CONFIG_IP_MULTICAST
1724 sf_markstate(pmc);
1725#endif
1726 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1727 if (!delta)
1728 pmc->sfcount[sfmode]++;
1729 err = 0;
1730 for (i=0; i<sfcount; i++) {
5eb81e89 1731 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT		 1732 if (err)
1733 break;
1734 }
1735 if (err) {
1736 int j;
1737
685f94e6
JZ		 1738 if (!delta)
1739 pmc->sfcount[sfmode]--;
1da177e4 1740 for (j=0; j<i; j++)
a1889c0d 1741 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4
LT		 1742 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1743#ifdef CONFIG_IP_MULTICAST
1da177e4 1744 struct ip_sf_list *psf;
cfcabdcc 1745 in_dev = pmc->interface;
1da177e4
LT		 1746#endif
1747
1748 /* filter mode change */
1749 if (pmc->sfcount[MCAST_EXCLUDE])
1750 pmc->sfmode = MCAST_EXCLUDE;
1751 else if (pmc->sfcount[MCAST_INCLUDE])
1752 pmc->sfmode = MCAST_INCLUDE;
1753#ifdef CONFIG_IP_MULTICAST
1754 /* else no filters; keep old mode for reports */
1755
e905a9ed 1756 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1757 IGMP_Unsolicited_Report_Count;
1758 in_dev->mr_ifc_count = pmc->crcount;
1759 for (psf=pmc->sources; psf; psf = psf->sf_next)
1760 psf->sf_crcount = 0;
1761 igmp_ifc_event(in_dev);
1762 } else if (sf_setstate(pmc)) {
1763 igmp_ifc_event(in_dev);
1764#endif
1765 }
1766 spin_unlock_bh(&pmc->lock);
1767 return err;
1768}
1769
1770static void ip_mc_clear_src(struct ip_mc_list *pmc)
1771{
1772 struct ip_sf_list *psf, *nextpsf;
1773
1774 for (psf=pmc->tomb; psf; psf=nextpsf) {
1775 nextpsf = psf->sf_next;
1776 kfree(psf);
1777 }
1778 pmc->tomb = NULL;
1779 for (psf=pmc->sources; psf; psf=nextpsf) {
1780 nextpsf = psf->sf_next;
1781 kfree(psf);
1782 }
1783 pmc->sources = NULL;
1784 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1785 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1786 pmc->sfcount[MCAST_EXCLUDE] = 1;
1787}
1788
1789
1790/*
1791 * Join a multicast group
1792 */
1793int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1794{
1795 int err;
8f935bbd 1796 __be32 addr = imr->imr_multiaddr.s_addr;
a7e9ff73 1797 struct ip_mc_socklist *iml = NULL, *i;
1da177e4
LT		 1798 struct in_device *in_dev;
1799 struct inet_sock *inet = inet_sk(sk);
877acedc 1800 struct net *net = sock_net(sk);
ca9b907d 1801 int ifindex;
1da177e4
LT		 1802 int count = 0;
1803
f97c1e0c 1804 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1805 return -EINVAL;
1806
6756ae4b 1807 rtnl_lock();
1da177e4 1808
877acedc 1809 in_dev = ip_mc_find_dev(net, imr);
1da177e4
LT		 1810
1811 if (!in_dev) {
1812 iml = NULL;
1813 err = -ENODEV;
1814 goto done;
1815 }
1816
1da177e4 1817 err = -EADDRINUSE;
ca9b907d 1818 ifindex = imr->imr_ifindex;
1d7138de 1819 for_each_pmc_rtnl(inet, i) {
ca9b907d
DS		 1820 if (i->multi.imr_multiaddr.s_addr == addr &&
1821 i->multi.imr_ifindex == ifindex)
1da177e4 1822 goto done;
1da177e4
LT		 1823 count++;
1824 }
1825 err = -ENOBUFS;
ca9b907d
DS		 1826 if (count >= sysctl_igmp_max_memberships)
1827 goto done;
a7e9ff73 1828 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
ca9b907d 1829 if (iml == NULL)
1da177e4 1830 goto done;
ca9b907d 1831
1da177e4 1832 memcpy(&iml->multi, imr, sizeof(*imr));
1d7138de 1833 iml->next_rcu = inet->mc_list;
1da177e4
LT		 1834 iml->sflist = NULL;
1835 iml->sfmode = MCAST_EXCLUDE;
cf778b00 1836 rcu_assign_pointer(inet->mc_list, iml);
1da177e4 1837 ip_mc_inc_group(in_dev, addr);
1da177e4 1838 err = 0;
1da177e4 1839done:
6756ae4b 1840 rtnl_unlock();
1da177e4
LT		 1841 return err;
1842}
4bc2f18b 1843EXPORT_SYMBOL(ip_mc_join_group);
1da177e4
LT		 1844
1845static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1846 struct in_device *in_dev)
1847{
1d7138de 1848 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1da177e4
LT		 1849 int err;
1850
c85bb41e 1851 if (psf == NULL) {
1da177e4
LT		 1852 /* any-source empty exclude case */
1853 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1854 iml->sfmode, 0, NULL, 0);
1855 }
1856 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
c85bb41e 1857 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
a9b3cd7f 1858 RCU_INIT_POINTER(iml->sflist, NULL);
c85bb41e
FL		 1859 /* decrease mem now to avoid the memleak warning */
1860 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
7519cce4 1861 kfree_rcu(psf, rcu);
1da177e4
LT		 1862 return err;
1863}
1864
1865/*
1866 * Ask a socket to leave a group.
1867 */
1868
1869int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1870{
1871 struct inet_sock *inet = inet_sk(sk);
1d7138de
ED		 1872 struct ip_mc_socklist *iml;
1873 struct ip_mc_socklist __rcu **imlp;
84b42bae 1874 struct in_device *in_dev;
877acedc 1875 struct net *net = sock_net(sk);
8f935bbd 1876 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1877 u32 ifindex;
acd6e00b 1878 int ret = -EADDRNOTAVAIL;
1da177e4
LT		 1879
1880 rtnl_lock();
877acedc 1881 in_dev = ip_mc_find_dev(net, imr);
4fbf1009 1882 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
48b60bb7 1883 ret = -ENODEV;
1884 goto out;
1885 }
84b42bae 1886 ifindex = imr->imr_ifindex;
1d7138de
ED		 1887 for (imlp = &inet->mc_list;
1888 (iml = rtnl_dereference(*imlp)) != NULL;
1889 imlp = &iml->next_rcu) {
acd6e00b
DS		 1890 if (iml->multi.imr_multiaddr.s_addr != group)
1891 continue;
1892 if (ifindex) {
1893 if (iml->multi.imr_ifindex != ifindex)
1894 continue;
1895 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1896 iml->multi.imr_address.s_addr)
1897 continue;
1da177e4 1898
acd6e00b 1899 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4 1900
1d7138de 1901 *imlp = iml->next_rcu;
acd6e00b 1902
4fbf1009
AL		 1903 if (in_dev)
1904 ip_mc_dec_group(in_dev, group);
acd6e00b 1905 rtnl_unlock();
4fbf1009 1906
c85bb41e
FL		 1907 /* decrease mem now to avoid the memleak warning */
1908 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
10d50e74 1909 kfree_rcu(iml, rcu);
acd6e00b 1910 return 0;
1da177e4 1911 }
48b60bb7 1912out:
1da177e4 1913 rtnl_unlock();
acd6e00b 1914 return ret;
1da177e4 1915}
193ba924 1916EXPORT_SYMBOL(ip_mc_leave_group);
1da177e4
LT		 1917
1918int ip_mc_source(int add, int omode, struct sock *sk, struct
1919 ip_mreq_source *mreqs, int ifindex)
1920{
1921 int err;
1922 struct ip_mreqn imr;
63007727 1923 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 1924 struct ip_mc_socklist *pmc;
1925 struct in_device *in_dev = NULL;
1926 struct inet_sock *inet = inet_sk(sk);
1927 struct ip_sf_socklist *psl;
877acedc 1928 struct net *net = sock_net(sk);
8cdaaa15 1929 int leavegroup = 0;
1da177e4
LT		 1930 int i, j, rv;
1931
f97c1e0c 1932 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1933 return -EINVAL;
1934
6756ae4b 1935 rtnl_lock();
1da177e4
LT		 1936
1937 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1938 imr.imr_address.s_addr = mreqs->imr_interface;
1939 imr.imr_ifindex = ifindex;
877acedc 1940 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 1941
1942 if (!in_dev) {
1943 err = -ENODEV;
1944 goto done;
1945 }
1946 err = -EADDRNOTAVAIL;
1947
1d7138de 1948 for_each_pmc_rtnl(inet, pmc) {
f64f9e71
JP		 1949 if ((pmc->multi.imr_multiaddr.s_addr ==
1950 imr.imr_multiaddr.s_addr) &&
1951 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1da177e4
LT		 1952 break;
1953 }
917f2f10
DS		 1954 if (!pmc) { /* must have a prior join */
1955 err = -EINVAL;
1da177e4 1956 goto done;
917f2f10 1957 }
1da177e4
LT		 1958 /* if a source filter was set, must be the same mode as before */
1959 if (pmc->sflist) {
917f2f10
DS		 1960 if (pmc->sfmode != omode) {
1961 err = -EINVAL;
1da177e4 1962 goto done;
917f2f10 1963 }
1da177e4
LT		 1964 } else if (pmc->sfmode != omode) {
1965 /* allow mode switches for empty-set filters */
1966 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 1967 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 1968 NULL, 0);
1969 pmc->sfmode = omode;
1970 }
1971
1d7138de 1972 psl = rtnl_dereference(pmc->sflist);
1da177e4
LT		 1973 if (!add) {
1974 if (!psl)
917f2f10 1975 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1976 rv = !0;
1977 for (i=0; i<psl->sl_count; i++) {
1978 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1979 sizeof(__be32));
1da177e4
LT		 1980 if (rv == 0)
1981 break;
1982 }
1983 if (rv) /* source not found */
917f2f10 1984 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1985
8cdaaa15
DS		 1986 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1987 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1988 leavegroup = 1;
1989 goto done;
1990 }
1991
1da177e4 1992 /* update the interface filter */
e905a9ed 1993 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1994 &mreqs->imr_sourceaddr, 1);
1995
1996 for (j=i+1; j<psl->sl_count; j++)
1997 psl->sl_addr[j-1] = psl->sl_addr[j];
1998 psl->sl_count--;
1999 err = 0;
2000 goto done;
2001 }
2002 /* else, add a new source to the filter */
2003
2004 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2005 err = -ENOBUFS;
2006 goto done;
2007 }
2008 if (!psl || psl->sl_count == psl->sl_max) {
2009 struct ip_sf_socklist *newpsl;
2010 int count = IP_SFBLOCK;
2011
2012 if (psl)
2013 count += psl->sl_max;
8b3a7005 2014 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 2015 if (!newpsl) {
2016 err = -ENOBUFS;
2017 goto done;
2018 }
2019 newpsl->sl_max = count;
2020 newpsl->sl_count = count - IP_SFBLOCK;
2021 if (psl) {
2022 for (i=0; i<psl->sl_count; i++)
2023 newpsl->sl_addr[i] = psl->sl_addr[i];
c85bb41e
FL		 2024 /* decrease mem now to avoid the memleak warning */
2025 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
7519cce4 2026 kfree_rcu(psl, rcu);
1da177e4 2027 }
cf778b00 2028 rcu_assign_pointer(pmc->sflist, newpsl);
c85bb41e 2029 psl = newpsl;
1da177e4
LT		 2030 }
2031 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2032 for (i=0; i<psl->sl_count; i++) {
2033 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 2034 sizeof(__be32));
1da177e4
LT		 2035 if (rv == 0)
2036 break;
2037 }
2038 if (rv == 0) /* address already there is an error */
2039 goto done;
2040 for (j=psl->sl_count-1; j>=i; j--)
2041 psl->sl_addr[j+1] = psl->sl_addr[j];
2042 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2043 psl->sl_count++;
2044 err = 0;
2045 /* update the interface list */
e905a9ed 2046 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 2047 &mreqs->imr_sourceaddr, 1);
2048done:
6756ae4b 2049 rtnl_unlock();
8cdaaa15
DS		 2050 if (leavegroup)
2051 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2052 return err;
2053}
2054
2055int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2056{
9951f036 2057 int err = 0;
1da177e4 2058 struct ip_mreqn imr;
63007727 2059 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2060 struct ip_mc_socklist *pmc;
2061 struct in_device *in_dev;
2062 struct inet_sock *inet = inet_sk(sk);
2063 struct ip_sf_socklist *newpsl, *psl;
877acedc 2064 struct net *net = sock_net(sk);
9951f036 2065 int leavegroup = 0;
1da177e4 2066
f97c1e0c 2067 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2068 return -EINVAL;
2069 if (msf->imsf_fmode != MCAST_INCLUDE &&
2070 msf->imsf_fmode != MCAST_EXCLUDE)
2071 return -EINVAL;
2072
6756ae4b 2073 rtnl_lock();
1da177e4
LT		 2074
2075 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2076 imr.imr_address.s_addr = msf->imsf_interface;
2077 imr.imr_ifindex = ifindex;
877acedc 2078 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2079
2080 if (!in_dev) {
2081 err = -ENODEV;
2082 goto done;
2083 }
1da177e4 2084
9951f036
DS		 2085 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2086 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2087 leavegroup = 1;
2088 goto done;
2089 }
2090
1d7138de 2091 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2092 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2093 pmc->multi.imr_ifindex == imr.imr_ifindex)
2094 break;
2095 }
917f2f10
DS		 2096 if (!pmc) { /* must have a prior join */
2097 err = -EINVAL;
1da177e4 2098 goto done;
917f2f10 2099 }
1da177e4 2100 if (msf->imsf_numsrc) {
8b3a7005
KK		 2101 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2102 GFP_KERNEL);
1da177e4
LT		 2103 if (!newpsl) {
2104 err = -ENOBUFS;
2105 goto done;
2106 }
2107 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2108 memcpy(newpsl->sl_addr, msf->imsf_slist,
2109 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2110 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2111 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2112 if (err) {
2113 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2114 goto done;
2115 }
8713dbf0 2116 } else {
1da177e4 2117 newpsl = NULL;
8713dbf0
YZ		 2118 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2119 msf->imsf_fmode, 0, NULL, 0);
2120 }
1d7138de 2121 psl = rtnl_dereference(pmc->sflist);
1da177e4
LT		 2122 if (psl) {
2123 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2124 psl->sl_count, psl->sl_addr, 0);
c85bb41e
FL		 2125 /* decrease mem now to avoid the memleak warning */
2126 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
7519cce4 2127 kfree_rcu(psl, rcu);
1da177e4
LT		 2128 } else
2129 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2130 0, NULL, 0);
cf778b00 2131 rcu_assign_pointer(pmc->sflist, newpsl);
1da177e4 2132 pmc->sfmode = msf->imsf_fmode;
917f2f10 2133 err = 0;
1da177e4 2134done:
6756ae4b 2135 rtnl_unlock();
9951f036
DS		 2136 if (leavegroup)
2137 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2138 return err;
2139}
2140
2141int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2142 struct ip_msfilter __user *optval, int __user *optlen)
2143{
2144 int err, len, count, copycount;
2145 struct ip_mreqn imr;
63007727 2146 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2147 struct ip_mc_socklist *pmc;
2148 struct in_device *in_dev;
2149 struct inet_sock *inet = inet_sk(sk);
2150 struct ip_sf_socklist *psl;
877acedc 2151 struct net *net = sock_net(sk);
1da177e4 2152
f97c1e0c 2153 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2154 return -EINVAL;
2155
6756ae4b 2156 rtnl_lock();
1da177e4
LT		 2157
2158 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2159 imr.imr_address.s_addr = msf->imsf_interface;
2160 imr.imr_ifindex = 0;
877acedc 2161 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2162
2163 if (!in_dev) {
2164 err = -ENODEV;
2165 goto done;
2166 }
2167 err = -EADDRNOTAVAIL;
2168
1d7138de 2169 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2170 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2171 pmc->multi.imr_ifindex == imr.imr_ifindex)
2172 break;
2173 }
2174 if (!pmc) /* must have a prior join */
2175 goto done;
2176 msf->imsf_fmode = pmc->sfmode;
1d7138de 2177 psl = rtnl_dereference(pmc->sflist);
6756ae4b 2178 rtnl_unlock();
1da177e4
LT		 2179 if (!psl) {
2180 len = 0;
2181 count = 0;
2182 } else {
2183 count = psl->sl_count;
2184 }
2185 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2186 len = copycount * sizeof(psl->sl_addr[0]);
2187 msf->imsf_numsrc = count;
2188 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2189 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2190 return -EFAULT;
2191 }
2192 if (len &&
2193 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2194 return -EFAULT;
2195 return 0;
2196done:
6756ae4b 2197 rtnl_unlock();
1da177e4
LT		 2198 return err;
2199}
2200
2201int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2202 struct group_filter __user *optval, int __user *optlen)
2203{
2204 int err, i, count, copycount;
2205 struct sockaddr_in *psin;
63007727 2206 __be32 addr;
1da177e4
LT		 2207 struct ip_mc_socklist *pmc;
2208 struct inet_sock *inet = inet_sk(sk);
2209 struct ip_sf_socklist *psl;
2210
2211 psin = (struct sockaddr_in *)&gsf->gf_group;
2212 if (psin->sin_family != AF_INET)
2213 return -EINVAL;
2214 addr = psin->sin_addr.s_addr;
f97c1e0c 2215 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2216 return -EINVAL;
2217
6756ae4b 2218 rtnl_lock();
1da177e4
LT		 2219
2220 err = -EADDRNOTAVAIL;
2221
1d7138de 2222 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2223 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2224 pmc->multi.imr_ifindex == gsf->gf_interface)
2225 break;
2226 }
2227 if (!pmc) /* must have a prior join */
2228 goto done;
2229 gsf->gf_fmode = pmc->sfmode;
1d7138de 2230 psl = rtnl_dereference(pmc->sflist);
6756ae4b 2231 rtnl_unlock();
1da177e4
LT		 2232 count = psl ? psl->sl_count : 0;
2233 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2234 gsf->gf_numsrc = count;
2235 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2236 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2237 return -EFAULT;
2238 }
2239 for (i=0; i<copycount; i++) {
1da177e4
LT		 2240 struct sockaddr_storage ss;
2241
2242 psin = (struct sockaddr_in *)&ss;
2243 memset(&ss, 0, sizeof(ss));
2244 psin->sin_family = AF_INET;
2245 psin->sin_addr.s_addr = psl->sl_addr[i];
2246 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2247 return -EFAULT;
2248 }
2249 return 0;
2250done:
6756ae4b 2251 rtnl_unlock();
1da177e4
LT		 2252 return err;
2253}
2254
2255/*
2256 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2257 */
c0cda068 2258int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2259{
2260 struct inet_sock *inet = inet_sk(sk);
2261 struct ip_mc_socklist *pmc;
2262 struct ip_sf_socklist *psl;
2263 int i;
c85bb41e 2264 int ret;
1da177e4 2265
c85bb41e 2266 ret = 1;
f97c1e0c 2267 if (!ipv4_is_multicast(loc_addr))
c85bb41e 2268 goto out;
1da177e4 2269
c85bb41e 2270 rcu_read_lock();
1d7138de 2271 for_each_pmc_rcu(inet, pmc) {
1da177e4
LT		 2272 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2273 pmc->multi.imr_ifindex == dif)
2274 break;
2275 }
c85bb41e 2276 ret = inet->mc_all;
1da177e4 2277 if (!pmc)
c85bb41e 2278 goto unlock;
1d7138de 2279 psl = rcu_dereference(pmc->sflist);
c85bb41e 2280 ret = (pmc->sfmode == MCAST_EXCLUDE);
1da177e4 2281 if (!psl)
c85bb41e 2282 goto unlock;
1da177e4
LT		 2283
2284 for (i=0; i<psl->sl_count; i++) {
2285 if (psl->sl_addr[i] == rmt_addr)
2286 break;
2287 }
c85bb41e 2288 ret = 0;
1da177e4 2289 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
c85bb41e 2290 goto unlock;
1da177e4 2291 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
c85bb41e
FL		 2292 goto unlock;
2293 ret = 1;
2294unlock:
2295 rcu_read_unlock();
2296out:
2297 return ret;
1da177e4
LT		 2298}
2299
2300/*
2301 * A socket is closing.
2302 */
2303
2304void ip_mc_drop_socket(struct sock *sk)
2305{
2306 struct inet_sock *inet = inet_sk(sk);
2307 struct ip_mc_socklist *iml;
877acedc 2308 struct net *net = sock_net(sk);
1da177e4
LT		 2309
2310 if (inet->mc_list == NULL)
2311 return;
2312
2313 rtnl_lock();
1d7138de 2314 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
1da177e4 2315 struct in_device *in_dev;
1da177e4 2316
1d7138de 2317 inet->mc_list = iml->next_rcu;
877acedc 2318 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
bb699cbc 2319 (void) ip_mc_leave_src(sk, iml, in_dev);
18943d29 2320 if (in_dev != NULL)
1da177e4 2321 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
c85bb41e
FL		 2322 /* decrease mem now to avoid the memleak warning */
2323 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
10d50e74 2324 kfree_rcu(iml, rcu);
1da177e4
LT		 2325 }
2326 rtnl_unlock();
2327}
2328
dbdd9a52
DM		 2329/* called with rcu_read_lock() */
2330int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2331{
2332 struct ip_mc_list *im;
2333 struct ip_sf_list *psf;
2334 int rv = 0;
2335
1d7138de 2336 for_each_pmc_rcu(in_dev, im) {
1da177e4
LT		 2337 if (im->multiaddr == mc_addr)
2338 break;
2339 }
2340 if (im && proto == IPPROTO_IGMP) {
2341 rv = 1;
2342 } else if (im) {
2343 if (src_addr) {
2344 for (psf=im->sources; psf; psf=psf->sf_next) {
2345 if (psf->sf_inaddr == src_addr)
2346 break;
2347 }
2348 if (psf)
2349 rv = psf->sf_count[MCAST_INCLUDE] ||
2350 psf->sf_count[MCAST_EXCLUDE] !=
2351 im->sfcount[MCAST_EXCLUDE];
2352 else
2353 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2354 } else
2355 rv = 1; /* unspecified source; tentatively allow */
2356 }
1da177e4
LT		 2357 return rv;
2358}
2359
2360#if defined(CONFIG_PROC_FS)
2361struct igmp_mc_iter_state {
7091e728 2362 struct seq_net_private p;
1da177e4
LT		 2363 struct net_device *dev;
2364 struct in_device *in_dev;
2365};
2366
2367#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2368
2369static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2370{
7091e728 2371 struct net *net = seq_file_net(seq);
1da177e4
LT		 2372 struct ip_mc_list *im = NULL;
2373 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2374
7562f876 2375 state->in_dev = NULL;
61fbab77 2376 for_each_netdev_rcu(net, state->dev) {
1da177e4 2377 struct in_device *in_dev;
6baff150
ED		 2378
2379 in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2380 if (!in_dev)
2381 continue;
1d7138de 2382 im = rcu_dereference(in_dev->mc_list);
1da177e4
LT		 2383 if (im) {
2384 state->in_dev = in_dev;
2385 break;
2386 }
1da177e4
LT		 2387 }
2388 return im;
2389}
2390
2391static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2392{
2393 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
6baff150 2394
1d7138de
ED		 2395 im = rcu_dereference(im->next_rcu);
2396 while (!im) {
6baff150 2397 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2398 if (!state->dev) {
2399 state->in_dev = NULL;
2400 break;
2401 }
6baff150 2402 state->in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2403 if (!state->in_dev)
2404 continue;
1d7138de 2405 im = rcu_dereference(state->in_dev->mc_list);
1da177e4
LT		 2406 }
2407 return im;
2408}
2409
2410static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2411{
2412 struct ip_mc_list *im = igmp_mc_get_first(seq);
2413 if (im)
2414 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2415 --pos;
2416 return pos ? NULL : im;
2417}
2418
2419static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2420 __acquires(rcu)
1da177e4 2421{
61fbab77 2422 rcu_read_lock();
1da177e4
LT		 2423 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2424}
2425
2426static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2427{
2428 struct ip_mc_list *im;
2429 if (v == SEQ_START_TOKEN)
2430 im = igmp_mc_get_first(seq);
2431 else
2432 im = igmp_mc_get_next(seq, v);
2433 ++*pos;
2434 return im;
2435}
2436
2437static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
61fbab77 2438 __releases(rcu)
1da177e4
LT		 2439{
2440 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
1d7138de
ED		 2441
2442 state->in_dev = NULL;
1da177e4 2443 state->dev = NULL;
61fbab77 2444 rcu_read_unlock();
1da177e4
LT		 2445}
2446
2447static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2448{
2449 if (v == SEQ_START_TOKEN)
e905a9ed 2450 seq_puts(seq,
1da177e4
LT		 2451 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2452 else {
2453 struct ip_mc_list *im = (struct ip_mc_list *)v;
2454 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2455 char *querier;
a399a805
ED		 2456 long delta;
2457
1da177e4
LT		 2458#ifdef CONFIG_IP_MULTICAST
2459 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2460 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2461 "V3";
2462#else
2463 querier = "NONE";
2464#endif
2465
1d7138de 2466 if (rcu_dereference(state->in_dev->mc_list) == im) {
1da177e4 2467 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
b8bae41e 2468 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
1da177e4
LT		 2469 }
2470
a399a805 2471 delta = im->timer.expires - jiffies;
1da177e4 2472 seq_printf(seq,
338fcf98 2473 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4 2474 im->multiaddr, im->users,
a399a805
ED		 2475 im->tm_running,
2476 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
1da177e4
LT		 2477 im->reporter);
2478 }
2479 return 0;
2480}
2481
f690808e 2482static const struct seq_operations igmp_mc_seq_ops = {
1da177e4
LT		 2483 .start = igmp_mc_seq_start,
2484 .next = igmp_mc_seq_next,
2485 .stop = igmp_mc_seq_stop,
2486 .show = igmp_mc_seq_show,
2487};
2488
2489static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2490{
7091e728 2491 return seq_open_net(inode, file, &igmp_mc_seq_ops,
cf7732e4 2492 sizeof(struct igmp_mc_iter_state));
1da177e4
LT		 2493}
2494
9a32144e 2495static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2496 .owner = THIS_MODULE,
2497 .open = igmp_mc_seq_open,
2498 .read = seq_read,
2499 .llseek = seq_lseek,
7091e728 2500 .release = seq_release_net,
1da177e4
LT		 2501};
2502
2503struct igmp_mcf_iter_state {
7091e728 2504 struct seq_net_private p;
1da177e4
LT		 2505 struct net_device *dev;
2506 struct in_device *idev;
2507 struct ip_mc_list *im;
2508};
2509
2510#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2511
2512static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2513{
7091e728 2514 struct net *net = seq_file_net(seq);
1da177e4
LT		 2515 struct ip_sf_list *psf = NULL;
2516 struct ip_mc_list *im = NULL;
2517 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2518
7562f876
PE		 2519 state->idev = NULL;
2520 state->im = NULL;
61fbab77 2521 for_each_netdev_rcu(net, state->dev) {
1da177e4 2522 struct in_device *idev;
6baff150 2523 idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2524 if (unlikely(idev == NULL))
2525 continue;
1d7138de 2526 im = rcu_dereference(idev->mc_list);
1da177e4
LT		 2527 if (likely(im != NULL)) {
2528 spin_lock_bh(&im->lock);
2529 psf = im->sources;
2530 if (likely(psf != NULL)) {
2531 state->im = im;
2532 state->idev = idev;
2533 break;
2534 }
2535 spin_unlock_bh(&im->lock);
2536 }
1da177e4
LT		 2537 }
2538 return psf;
2539}
2540
2541static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2542{
2543 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2544
2545 psf = psf->sf_next;
2546 while (!psf) {
2547 spin_unlock_bh(&state->im->lock);
2548 state->im = state->im->next;
2549 while (!state->im) {
6baff150 2550 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2551 if (!state->dev) {
2552 state->idev = NULL;
2553 goto out;
2554 }
6baff150 2555 state->idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2556 if (!state->idev)
2557 continue;
1d7138de 2558 state->im = rcu_dereference(state->idev->mc_list);
1da177e4
LT		 2559 }
2560 if (!state->im)
2561 break;
2562 spin_lock_bh(&state->im->lock);
2563 psf = state->im->sources;
2564 }
2565out:
2566 return psf;
2567}
2568
2569static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2570{
2571 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2572 if (psf)
2573 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2574 --pos;
2575 return pos ? NULL : psf;
2576}
2577
2578static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2579 __acquires(rcu)
1da177e4 2580{
61fbab77 2581 rcu_read_lock();
1da177e4
LT		 2582 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2583}
2584
2585static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2586{
2587 struct ip_sf_list *psf;
2588 if (v == SEQ_START_TOKEN)
2589 psf = igmp_mcf_get_first(seq);
2590 else
2591 psf = igmp_mcf_get_next(seq, v);
2592 ++*pos;
2593 return psf;
2594}
2595
2596static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
61fbab77 2597 __releases(rcu)
1da177e4
LT		 2598{
2599 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2600 if (likely(state->im != NULL)) {
2601 spin_unlock_bh(&state->im->lock);
2602 state->im = NULL;
2603 }
1d7138de 2604 state->idev = NULL;
1da177e4 2605 state->dev = NULL;
61fbab77 2606 rcu_read_unlock();
1da177e4
LT		 2607}
2608
2609static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2610{
2611 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2612 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2613
2614 if (v == SEQ_START_TOKEN) {
e905a9ed 2615 seq_printf(seq,
1da177e4
LT		 2616 "%3s %6s "
2617 "%10s %10s %6s %6s\n", "Idx",
2618 "Device", "MCA",
2619 "SRC", "INC", "EXC");
2620 } else {
2621 seq_printf(seq,
2622 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2623 "0x%08x %6lu %6lu\n",
2624 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2625 ntohl(state->im->multiaddr),
2626 ntohl(psf->sf_inaddr),
2627 psf->sf_count[MCAST_INCLUDE],
2628 psf->sf_count[MCAST_EXCLUDE]);
2629 }
2630 return 0;
2631}
2632
f690808e 2633static const struct seq_operations igmp_mcf_seq_ops = {
1da177e4
LT		 2634 .start = igmp_mcf_seq_start,
2635 .next = igmp_mcf_seq_next,
2636 .stop = igmp_mcf_seq_stop,
2637 .show = igmp_mcf_seq_show,
2638};
2639
2640static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2641{
7091e728 2642 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
cf7732e4 2643 sizeof(struct igmp_mcf_iter_state));
1da177e4
LT		 2644}
2645
9a32144e 2646static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2647 .owner = THIS_MODULE,
2648 .open = igmp_mcf_seq_open,
2649 .read = seq_read,
2650 .llseek = seq_lseek,
7091e728 2651 .release = seq_release_net,
1da177e4
LT		 2652};
2653
2c8c1e72 2654static int __net_init igmp_net_init(struct net *net)
1da177e4 2655{
7091e728
AD		 2656 struct proc_dir_entry *pde;
2657
d4beaa66 2658 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
7091e728
AD		 2659 if (!pde)
2660 goto out_igmp;
d4beaa66
G		 2661 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2662 &igmp_mcf_seq_fops);
7091e728
AD		 2663 if (!pde)
2664 goto out_mcfilter;
1da177e4 2665 return 0;
7091e728
AD		 2666
2667out_mcfilter:
ece31ffd 2668 remove_proc_entry("igmp", net->proc_net);
7091e728
AD		 2669out_igmp:
2670 return -ENOMEM;
2671}
2672
2c8c1e72 2673static void __net_exit igmp_net_exit(struct net *net)
7091e728 2674{
ece31ffd
G		 2675 remove_proc_entry("mcfilter", net->proc_net);
2676 remove_proc_entry("igmp", net->proc_net);
7091e728
AD		 2677}
2678
2679static struct pernet_operations igmp_net_ops = {
2680 .init = igmp_net_init,
2681 .exit = igmp_net_exit,
2682};
2683
2684int __init igmp_mc_proc_init(void)
2685{
2686 return register_pernet_subsys(&igmp_net_ops);
1da177e4
LT		 2687}
2688#endif
kernel source for telekom puls (alcatel/mediatek)