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Merge tag 'v3.10.106' 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;
199
200 in_dev->mr_gq_running = 1;
201 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
202 in_dev_hold(in_dev);
203}
204
205static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
206{
207 int tv = net_random() % delay;
208
209 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
210 in_dev_hold(in_dev);
211}
212
213static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
214{
215 spin_lock_bh(&im->lock);
216 im->unsolicit_count = 0;
217 if (del_timer(&im->timer)) {
218 if ((long)(im->timer.expires-jiffies) < max_delay) {
219 add_timer(&im->timer);
a7e9ff73 220 im->tm_running = 1;
1da177e4
LT		 221 spin_unlock_bh(&im->lock);
222 return;
223 }
224 atomic_dec(&im->refcnt);
225 }
226 igmp_start_timer(im, max_delay);
227 spin_unlock_bh(&im->lock);
228}
229
230
231/*
232 * Send an IGMP report.
233 */
234
235#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
236
237
238static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
239 int gdeleted, int sdeleted)
240{
241 switch (type) {
242 case IGMPV3_MODE_IS_INCLUDE:
243 case IGMPV3_MODE_IS_EXCLUDE:
244 if (gdeleted || sdeleted)
245 return 0;
ad12583f
DS		 246 if (!(pmc->gsquery && !psf->sf_gsresp)) {
247 if (pmc->sfmode == MCAST_INCLUDE)
248 return 1;
249 /* don't include if this source is excluded
250 * in all filters
251 */
252 if (psf->sf_count[MCAST_INCLUDE])
253 return type == IGMPV3_MODE_IS_INCLUDE;
254 return pmc->sfcount[MCAST_EXCLUDE] ==
255 psf->sf_count[MCAST_EXCLUDE];
256 }
257 return 0;
1da177e4
LT		 258 case IGMPV3_CHANGE_TO_INCLUDE:
259 if (gdeleted || sdeleted)
260 return 0;
261 return psf->sf_count[MCAST_INCLUDE] != 0;
262 case IGMPV3_CHANGE_TO_EXCLUDE:
263 if (gdeleted || sdeleted)
264 return 0;
265 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
266 psf->sf_count[MCAST_INCLUDE])
267 return 0;
268 return pmc->sfcount[MCAST_EXCLUDE] ==
269 psf->sf_count[MCAST_EXCLUDE];
270 case IGMPV3_ALLOW_NEW_SOURCES:
271 if (gdeleted || !psf->sf_crcount)
272 return 0;
273 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
274 case IGMPV3_BLOCK_OLD_SOURCES:
275 if (pmc->sfmode == MCAST_INCLUDE)
276 return gdeleted || (psf->sf_crcount && sdeleted);
277 return psf->sf_crcount && !gdeleted && !sdeleted;
278 }
279 return 0;
280}
281
282static int
283igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
284{
285 struct ip_sf_list *psf;
286 int scount = 0;
287
288 for (psf=pmc->sources; psf; psf=psf->sf_next) {
289 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
290 continue;
291 scount++;
292 }
293 return scount;
294}
295
57e1ab6e
ED		 296#define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
297
1da177e4
LT		 298static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
299{
300 struct sk_buff *skb;
301 struct rtable *rt;
302 struct iphdr *pip;
303 struct igmpv3_report *pig;
877acedc 304 struct net *net = dev_net(dev);
31e4543d 305 struct flowi4 fl4;
66088243
HX		 306 int hlen = LL_RESERVED_SPACE(dev);
307 int tlen = dev->needed_tailroom;
1da177e4 308
57e1ab6e 309 while (1) {
66088243 310 skb = alloc_skb(size + hlen + tlen,
57e1ab6e
ED		 311 GFP_ATOMIC | __GFP_NOWARN);
312 if (skb)
313 break;
314 size >>= 1;
315 if (size < 256)
316 return NULL;
317 }
318 igmp_skb_size(skb) = size;
1da177e4 319
31e4543d 320 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
78fbfd8a
DM		 321 0, 0,
322 IPPROTO_IGMP, 0, dev->ifindex);
323 if (IS_ERR(rt)) {
324 kfree_skb(skb);
325 return NULL;
1da177e4 326 }
1da177e4 327
d8d1f30b 328 skb_dst_set(skb, &rt->dst);
1da177e4
LT		 329 skb->dev = dev;
330
66088243 331 skb_reserve(skb, hlen);
1da177e4 332
7e28ecc2 333 skb_reset_network_header(skb);
eddc9ec5 334 pip = ip_hdr(skb);
7e28ecc2 335 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 336
337 pip->version = 4;
338 pip->ihl = (sizeof(struct iphdr)+4)>>2;
339 pip->tos = 0xc0;
340 pip->frag_off = htons(IP_DF);
341 pip->ttl = 1;
492f64ce
DM		 342 pip->daddr = fl4.daddr;
343 pip->saddr = fl4.saddr;
1da177e4
LT		 344 pip->protocol = IPPROTO_IGMP;
345 pip->tot_len = 0; /* filled in later */
ff1f69a8 346 ip_select_ident(skb, NULL);
5e73ea1a
DB		 347 ((u8 *)&pip[1])[0] = IPOPT_RA;
348 ((u8 *)&pip[1])[1] = 4;
349 ((u8 *)&pip[1])[2] = 0;
350 ((u8 *)&pip[1])[3] = 0;
1da177e4 351
b0e380b1 352 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
d10ba34b 353 skb_put(skb, sizeof(*pig));
d9edf9e2 354 pig = igmpv3_report_hdr(skb);
1da177e4
LT		 355 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
356 pig->resv1 = 0;
357 pig->csum = 0;
358 pig->resv2 = 0;
359 pig->ngrec = 0;
360 return skb;
361}
362
363static int igmpv3_sendpack(struct sk_buff *skb)
364{
d9edf9e2 365 struct igmphdr *pig = igmp_hdr(skb);
27a884dc 366 const int igmplen = skb->tail - skb->transport_header;
1da177e4 367
d9edf9e2 368 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
1da177e4 369
c439cb2e 370 return ip_local_out(skb);
1da177e4
LT		 371}
372
373static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
374{
a7e9ff73 375 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
1da177e4
LT		 376}
377
378static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
379 int type, struct igmpv3_grec **ppgr)
380{
381 struct net_device *dev = pmc->interface->dev;
382 struct igmpv3_report *pih;
383 struct igmpv3_grec *pgr;
384
385 if (!skb)
386 skb = igmpv3_newpack(dev, dev->mtu);
387 if (!skb)
388 return NULL;
389 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
390 pgr->grec_type = type;
391 pgr->grec_auxwords = 0;
392 pgr->grec_nsrcs = 0;
393 pgr->grec_mca = pmc->multiaddr;
d9edf9e2 394 pih = igmpv3_report_hdr(skb);
1da177e4
LT		 395 pih->ngrec = htons(ntohs(pih->ngrec)+1);
396 *ppgr = pgr;
397 return skb;
398}
399
57e1ab6e 400#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
1da177e4
LT		 401 skb_tailroom(skb)) : 0)
402
403static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
404 int type, int gdeleted, int sdeleted)
405{
406 struct net_device *dev = pmc->interface->dev;
407 struct igmpv3_report *pih;
408 struct igmpv3_grec *pgr = NULL;
409 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
ad12583f 410 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 411
412 if (pmc->multiaddr == IGMP_ALL_HOSTS)
413 return skb;
414
415 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
416 type == IGMPV3_MODE_IS_EXCLUDE;
417 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
418 type == IGMPV3_CHANGE_TO_EXCLUDE;
419
ad12583f
DS		 420 stotal = scount = 0;
421
1da177e4
LT		 422 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
423
ad12583f
DS		 424 if (!*psf_list)
425 goto empty_source;
426
d9edf9e2 427 pih = skb ? igmpv3_report_hdr(skb) : NULL;
1da177e4
LT		 428
429 /* EX and TO_EX get a fresh packet, if needed */
430 if (truncate) {
431 if (pih && pih->ngrec &&
432 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
433 if (skb)
434 igmpv3_sendpack(skb);
435 skb = igmpv3_newpack(dev, dev->mtu);
436 }
437 }
438 first = 1;
1da177e4
LT		 439 psf_prev = NULL;
440 for (psf=*psf_list; psf; psf=psf_next) {
ea4d9e72 441 __be32 *psrc;
1da177e4
LT		 442
443 psf_next = psf->sf_next;
444
445 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
446 psf_prev = psf;
447 continue;
448 }
449
450 /* clear marks on query responses */
451 if (isquery)
452 psf->sf_gsresp = 0;
453
63007727 454 if (AVAILABLE(skb) < sizeof(__be32) +
1da177e4
LT		 455 first*sizeof(struct igmpv3_grec)) {
456 if (truncate && !first)
457 break; /* truncate these */
458 if (pgr)
459 pgr->grec_nsrcs = htons(scount);
460 if (skb)
461 igmpv3_sendpack(skb);
462 skb = igmpv3_newpack(dev, dev->mtu);
463 first = 1;
464 scount = 0;
465 }
466 if (first) {
467 skb = add_grhead(skb, pmc, type, &pgr);
468 first = 0;
469 }
cc63f70b
AD		 470 if (!skb)
471 return NULL;
63007727 472 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
1da177e4 473 *psrc = psf->sf_inaddr;
ad12583f 474 scount++; stotal++;
1da177e4
LT		 475 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
476 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
477 psf->sf_crcount--;
478 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
479 if (psf_prev)
480 psf_prev->sf_next = psf->sf_next;
481 else
482 *psf_list = psf->sf_next;
483 kfree(psf);
484 continue;
485 }
486 }
487 psf_prev = psf;
488 }
ad12583f
DS		 489
490empty_source:
491 if (!stotal) {
492 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
493 type == IGMPV3_BLOCK_OLD_SOURCES)
494 return skb;
495 if (pmc->crcount || isquery) {
496 /* make sure we have room for group header */
497 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
498 igmpv3_sendpack(skb);
499 skb = NULL; /* add_grhead will get a new one */
500 }
501 skb = add_grhead(skb, pmc, type, &pgr);
502 }
503 }
1da177e4
LT		 504 if (pgr)
505 pgr->grec_nsrcs = htons(scount);
506
507 if (isquery)
508 pmc->gsquery = 0; /* clear query state on report */
509 return skb;
510}
511
512static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
513{
514 struct sk_buff *skb = NULL;
515 int type;
516
517 if (!pmc) {
1d7138de
ED		 518 rcu_read_lock();
519 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 520 if (pmc->multiaddr == IGMP_ALL_HOSTS)
521 continue;
522 spin_lock_bh(&pmc->lock);
523 if (pmc->sfcount[MCAST_EXCLUDE])
524 type = IGMPV3_MODE_IS_EXCLUDE;
525 else
526 type = IGMPV3_MODE_IS_INCLUDE;
527 skb = add_grec(skb, pmc, type, 0, 0);
528 spin_unlock_bh(&pmc->lock);
529 }
1d7138de 530 rcu_read_unlock();
1da177e4
LT		 531 } else {
532 spin_lock_bh(&pmc->lock);
533 if (pmc->sfcount[MCAST_EXCLUDE])
534 type = IGMPV3_MODE_IS_EXCLUDE;
535 else
536 type = IGMPV3_MODE_IS_INCLUDE;
537 skb = add_grec(skb, pmc, type, 0, 0);
538 spin_unlock_bh(&pmc->lock);
539 }
540 if (!skb)
541 return 0;
542 return igmpv3_sendpack(skb);
543}
544
545/*
546 * remove zero-count source records from a source filter list
547 */
548static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
549{
550 struct ip_sf_list *psf_prev, *psf_next, *psf;
551
552 psf_prev = NULL;
553 for (psf=*ppsf; psf; psf = psf_next) {
554 psf_next = psf->sf_next;
555 if (psf->sf_crcount == 0) {
556 if (psf_prev)
557 psf_prev->sf_next = psf->sf_next;
558 else
559 *ppsf = psf->sf_next;
560 kfree(psf);
561 } else
562 psf_prev = psf;
563 }
564}
565
566static void igmpv3_send_cr(struct in_device *in_dev)
567{
568 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
569 struct sk_buff *skb = NULL;
570 int type, dtype;
571
1d7138de 572 rcu_read_lock();
1da177e4
LT		 573 spin_lock_bh(&in_dev->mc_tomb_lock);
574
575 /* deleted MCA's */
576 pmc_prev = NULL;
577 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
578 pmc_next = pmc->next;
579 if (pmc->sfmode == MCAST_INCLUDE) {
580 type = IGMPV3_BLOCK_OLD_SOURCES;
581 dtype = IGMPV3_BLOCK_OLD_SOURCES;
582 skb = add_grec(skb, pmc, type, 1, 0);
583 skb = add_grec(skb, pmc, dtype, 1, 1);
584 }
585 if (pmc->crcount) {
1da177e4
LT		 586 if (pmc->sfmode == MCAST_EXCLUDE) {
587 type = IGMPV3_CHANGE_TO_INCLUDE;
588 skb = add_grec(skb, pmc, type, 1, 0);
589 }
ad12583f 590 pmc->crcount--;
1da177e4
LT		 591 if (pmc->crcount == 0) {
592 igmpv3_clear_zeros(&pmc->tomb);
593 igmpv3_clear_zeros(&pmc->sources);
594 }
595 }
596 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
597 if (pmc_prev)
598 pmc_prev->next = pmc_next;
599 else
600 in_dev->mc_tomb = pmc_next;
601 in_dev_put(pmc->interface);
602 kfree(pmc);
603 } else
604 pmc_prev = pmc;
605 }
606 spin_unlock_bh(&in_dev->mc_tomb_lock);
607
608 /* change recs */
1d7138de 609 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 610 spin_lock_bh(&pmc->lock);
611 if (pmc->sfcount[MCAST_EXCLUDE]) {
612 type = IGMPV3_BLOCK_OLD_SOURCES;
613 dtype = IGMPV3_ALLOW_NEW_SOURCES;
614 } else {
615 type = IGMPV3_ALLOW_NEW_SOURCES;
616 dtype = IGMPV3_BLOCK_OLD_SOURCES;
617 }
618 skb = add_grec(skb, pmc, type, 0, 0);
619 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
620
621 /* filter mode changes */
622 if (pmc->crcount) {
1da177e4
LT		 623 if (pmc->sfmode == MCAST_EXCLUDE)
624 type = IGMPV3_CHANGE_TO_EXCLUDE;
625 else
626 type = IGMPV3_CHANGE_TO_INCLUDE;
627 skb = add_grec(skb, pmc, type, 0, 0);
ad12583f 628 pmc->crcount--;
1da177e4
LT		 629 }
630 spin_unlock_bh(&pmc->lock);
631 }
1d7138de 632 rcu_read_unlock();
1da177e4
LT		 633
634 if (!skb)
635 return;
636 (void) igmpv3_sendpack(skb);
637}
638
639static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
640 int type)
641{
642 struct sk_buff *skb;
643 struct iphdr *iph;
644 struct igmphdr *ih;
645 struct rtable *rt;
646 struct net_device *dev = in_dev->dev;
877acedc 647 struct net *net = dev_net(dev);
63007727 648 __be32 group = pmc ? pmc->multiaddr : 0;
31e4543d 649 struct flowi4 fl4;
63007727 650 __be32 dst;
66088243 651 int hlen, tlen;
1da177e4
LT		 652
653 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
654 return igmpv3_send_report(in_dev, pmc);
655 else if (type == IGMP_HOST_LEAVE_MESSAGE)
656 dst = IGMP_ALL_ROUTER;
657 else
658 dst = group;
659
31e4543d 660 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
78fbfd8a
DM		 661 0, 0,
662 IPPROTO_IGMP, 0, dev->ifindex);
663 if (IS_ERR(rt))
664 return -1;
665
66088243
HX		 666 hlen = LL_RESERVED_SPACE(dev);
667 tlen = dev->needed_tailroom;
668 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
1da177e4
LT		 669 if (skb == NULL) {
670 ip_rt_put(rt);
671 return -1;
672 }
673
d8d1f30b 674 skb_dst_set(skb, &rt->dst);
1da177e4 675
66088243 676 skb_reserve(skb, hlen);
1da177e4 677
7e28ecc2 678 skb_reset_network_header(skb);
eddc9ec5 679 iph = ip_hdr(skb);
7e28ecc2 680 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 681
682 iph->version = 4;
683 iph->ihl = (sizeof(struct iphdr)+4)>>2;
684 iph->tos = 0xc0;
685 iph->frag_off = htons(IP_DF);
686 iph->ttl = 1;
687 iph->daddr = dst;
492f64ce 688 iph->saddr = fl4.saddr;
1da177e4 689 iph->protocol = IPPROTO_IGMP;
ff1f69a8 690 ip_select_ident(skb, NULL);
5e73ea1a
DB		 691 ((u8 *)&iph[1])[0] = IPOPT_RA;
692 ((u8 *)&iph[1])[1] = 4;
693 ((u8 *)&iph[1])[2] = 0;
694 ((u8 *)&iph[1])[3] = 0;
1da177e4
LT		 695
696 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
a7e9ff73
JK		 697 ih->type = type;
698 ih->code = 0;
699 ih->csum = 0;
700 ih->group = group;
701 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
1da177e4 702
c439cb2e 703 return ip_local_out(skb);
1da177e4
LT		 704}
705
706static void igmp_gq_timer_expire(unsigned long data)
707{
708 struct in_device *in_dev = (struct in_device *)data;
709
710 in_dev->mr_gq_running = 0;
711 igmpv3_send_report(in_dev, NULL);
fbf96d75 712 in_dev_put(in_dev);
1da177e4
LT		 713}
714
715static void igmp_ifc_timer_expire(unsigned long data)
716{
717 struct in_device *in_dev = (struct in_device *)data;
718
719 igmpv3_send_cr(in_dev);
720 if (in_dev->mr_ifc_count) {
721 in_dev->mr_ifc_count--;
722 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
723 }
fbf96d75 724 in_dev_put(in_dev);
1da177e4
LT		 725}
726
727static void igmp_ifc_event(struct in_device *in_dev)
728{
729 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
730 return;
e905a9ed 731 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 732 IGMP_Unsolicited_Report_Count;
733 igmp_ifc_start_timer(in_dev, 1);
734}
735
736
737static void igmp_timer_expire(unsigned long data)
738{
739 struct ip_mc_list *im=(struct ip_mc_list *)data;
740 struct in_device *in_dev = im->interface;
741
742 spin_lock(&im->lock);
a7e9ff73 743 im->tm_running = 0;
1da177e4
LT		 744
745 if (im->unsolicit_count) {
746 im->unsolicit_count--;
747 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
748 }
749 im->reporter = 1;
750 spin_unlock(&im->lock);
751
752 if (IGMP_V1_SEEN(in_dev))
753 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
754 else if (IGMP_V2_SEEN(in_dev))
755 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
756 else
757 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
758
759 ip_ma_put(im);
760}
761
ad12583f 762/* mark EXCLUDE-mode sources */
ea4d9e72 763static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 764{
765 struct ip_sf_list *psf;
766 int i, scount;
767
ad12583f
DS		 768 scount = 0;
769 for (psf=pmc->sources; psf; psf=psf->sf_next) {
770 if (scount == nsrcs)
771 break;
772 for (i=0; i<nsrcs; i++) {
773 /* skip inactive filters */
e05c4ad3 774 if (psf->sf_count[MCAST_INCLUDE] ||
ad12583f
DS		 775 pmc->sfcount[MCAST_EXCLUDE] !=
776 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 777 break;
ad12583f
DS		 778 if (srcs[i] == psf->sf_inaddr) {
779 scount++;
780 break;
781 }
782 }
783 }
784 pmc->gsquery = 0;
785 if (scount == nsrcs) /* all sources excluded */
786 return 0;
787 return 1;
788}
789
ea4d9e72 790static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 791{
792 struct ip_sf_list *psf;
793 int i, scount;
794
795 if (pmc->sfmode == MCAST_EXCLUDE)
796 return igmp_xmarksources(pmc, nsrcs, srcs);
797
798 /* mark INCLUDE-mode sources */
1da177e4
LT		 799 scount = 0;
800 for (psf=pmc->sources; psf; psf=psf->sf_next) {
801 if (scount == nsrcs)
802 break;
803 for (i=0; i<nsrcs; i++)
804 if (srcs[i] == psf->sf_inaddr) {
805 psf->sf_gsresp = 1;
806 scount++;
807 break;
808 }
809 }
ad12583f
DS		 810 if (!scount) {
811 pmc->gsquery = 0;
812 return 0;
813 }
814 pmc->gsquery = 1;
815 return 1;
1da177e4
LT		 816}
817
d679c532
ED		 818/* return true if packet was dropped */
819static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 820{
821 struct ip_mc_list *im;
822
823 /* Timers are only set for non-local groups */
824
825 if (group == IGMP_ALL_HOSTS)
d679c532 826 return false;
1da177e4 827
1d7138de
ED		 828 rcu_read_lock();
829 for_each_pmc_rcu(in_dev, im) {
1da177e4
LT		 830 if (im->multiaddr == group) {
831 igmp_stop_timer(im);
832 break;
833 }
834 }
1d7138de 835 rcu_read_unlock();
d679c532 836 return false;
1da177e4
LT		 837}
838
d679c532
ED		 839/* return true if packet was dropped */
840static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
1da177e4
LT		 841 int len)
842{
d9edf9e2
ACM		 843 struct igmphdr *ih = igmp_hdr(skb);
844 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
1da177e4 845 struct ip_mc_list *im;
63007727 846 __be32 group = ih->group;
1da177e4
LT		 847 int max_delay;
848 int mark = 0;
849
850
5b7c8406 851 if (len == 8) {
1da177e4
LT		 852 if (ih->code == 0) {
853 /* Alas, old v1 router presents here. */
e905a9ed 854
1da177e4
LT		 855 max_delay = IGMP_Query_Response_Interval;
856 in_dev->mr_v1_seen = jiffies +
857 IGMP_V1_Router_Present_Timeout;
858 group = 0;
859 } else {
860 /* v2 router present */
861 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
862 in_dev->mr_v2_seen = jiffies +
863 IGMP_V2_Router_Present_Timeout;
864 }
865 /* cancel the interface change timer */
866 in_dev->mr_ifc_count = 0;
867 if (del_timer(&in_dev->mr_ifc_timer))
868 __in_dev_put(in_dev);
869 /* clear deleted report items */
870 igmpv3_clear_delrec(in_dev);
871 } else if (len < 12) {
d679c532 872 return true; /* ignore bogus packet; freed by caller */
5b7c8406
DS		 873 } else if (IGMP_V1_SEEN(in_dev)) {
874 /* This is a v3 query with v1 queriers present */
875 max_delay = IGMP_Query_Response_Interval;
876 group = 0;
877 } else if (IGMP_V2_SEEN(in_dev)) {
878 /* this is a v3 query with v2 queriers present;
879 * Interpretation of the max_delay code is problematic here.
880 * A real v2 host would use ih_code directly, while v3 has a
881 * different encoding. We use the v3 encoding as more likely
882 * to be intended in a v3 query.
883 */
884 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
a8c1f65c
BH		 885 if (!max_delay)
886 max_delay = 1; /* can't mod w/ 0 */
1da177e4
LT		 887 } else { /* v3 */
888 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
d679c532 889 return true;
e905a9ed 890
d9edf9e2 891 ih3 = igmpv3_query_hdr(skb);
1da177e4 892 if (ih3->nsrcs) {
e905a9ed 893 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 894 + ntohs(ih3->nsrcs)*sizeof(__be32)))
d679c532 895 return true;
d9edf9e2 896 ih3 = igmpv3_query_hdr(skb);
1da177e4
LT		 897 }
898
899 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
900 if (!max_delay)
901 max_delay = 1; /* can't mod w/ 0 */
902 in_dev->mr_maxdelay = max_delay;
903 if (ih3->qrv)
904 in_dev->mr_qrv = ih3->qrv;
905 if (!group) { /* general query */
906 if (ih3->nsrcs)
d679c532 907 return false; /* no sources allowed */
1da177e4 908 igmp_gq_start_timer(in_dev);
d679c532 909 return false;
1da177e4
LT		 910 }
911 /* mark sources to include, if group & source-specific */
912 mark = ih3->nsrcs != 0;
913 }
914
915 /*
916 * - Start the timers in all of our membership records
917 * that the query applies to for the interface on
918 * which the query arrived excl. those that belong
919 * to a "local" group (224.0.0.X)
920 * - For timers already running check if they need to
921 * be reset.
922 * - Use the igmp->igmp_code field as the maximum
923 * delay possible
924 */
1d7138de
ED		 925 rcu_read_lock();
926 for_each_pmc_rcu(in_dev, im) {
ad12583f
DS		 927 int changed;
928
1da177e4
LT		 929 if (group && group != im->multiaddr)
930 continue;
931 if (im->multiaddr == IGMP_ALL_HOSTS)
932 continue;
933 spin_lock_bh(&im->lock);
934 if (im->tm_running)
935 im->gsquery = im->gsquery && mark;
936 else
937 im->gsquery = mark;
ad12583f 938 changed = !im->gsquery ||
e905a9ed 939 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 940 spin_unlock_bh(&im->lock);
ad12583f
DS		 941 if (changed)
942 igmp_mod_timer(im, max_delay);
1da177e4 943 }
1d7138de 944 rcu_read_unlock();
d679c532 945 return false;
1da177e4
LT		 946}
947
9a57a9d2 948/* called in rcu_read_lock() section */
1da177e4
LT		 949int igmp_rcv(struct sk_buff *skb)
950{
951 /* This basically follows the spec line by line -- see RFC1112 */
952 struct igmphdr *ih;
9a57a9d2 953 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1da177e4 954 int len = skb->len;
d679c532 955 bool dropped = true;
1da177e4 956
cd557bc1
DL		 957 if (in_dev == NULL)
958 goto drop;
1da177e4 959
fb286bb2 960 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
9a57a9d2 961 goto drop;
fb286bb2
HX		 962
963 switch (skb->ip_summed) {
84fa7933 964 case CHECKSUM_COMPLETE:
d3bc23e7 965 if (!csum_fold(skb->csum))
fb286bb2
HX		 966 break;
967 /* fall through */
968 case CHECKSUM_NONE:
969 skb->csum = 0;
970 if (__skb_checksum_complete(skb))
9a57a9d2 971 goto drop;
1da177e4
LT		 972 }
973
d9edf9e2 974 ih = igmp_hdr(skb);
1da177e4
LT		 975 switch (ih->type) {
976 case IGMP_HOST_MEMBERSHIP_QUERY:
d679c532 977 dropped = igmp_heard_query(in_dev, skb, len);
1da177e4
LT		 978 break;
979 case IGMP_HOST_MEMBERSHIP_REPORT:
980 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1da177e4 981 /* Is it our report looped back? */
c7537967 982 if (rt_is_output_route(skb_rtable(skb)))
1da177e4 983 break;
24c69275
DS		 984 /* don't rely on MC router hearing unicast reports */
985 if (skb->pkt_type == PACKET_MULTICAST ||
986 skb->pkt_type == PACKET_BROADCAST)
d679c532 987 dropped = igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 988 break;
989 case IGMP_PIM:
990#ifdef CONFIG_IP_PIMSM_V1
1da177e4
LT		 991 return pim_rcv_v1(skb);
992#endif
c6b471e6 993 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1da177e4
LT		 994 case IGMP_DVMRP:
995 case IGMP_TRACE:
996 case IGMP_HOST_LEAVE_MESSAGE:
997 case IGMP_MTRACE:
998 case IGMP_MTRACE_RESP:
999 break;
1000 default:
dd1c1853 1001 break;
1da177e4 1002 }
fb286bb2 1003
cd557bc1 1004drop:
d679c532
ED		 1005 if (dropped)
1006 kfree_skb(skb);
1007 else
1008 consume_skb(skb);
1da177e4
LT		 1009 return 0;
1010}
1011
1012#endif
1013
1014
1015/*
1016 * Add a filter to a device
1017 */
1018
63007727 1019static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1020{
1021 char buf[MAX_ADDR_LEN];
1022 struct net_device *dev = in_dev->dev;
1023
1024 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1025 We will get multicast token leakage, when IFF_MULTICAST
b81693d9 1026 is changed. This check should be done in ndo_set_rx_mode
1da177e4
LT		 1027 routine. Something sort of:
1028 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1029 --ANK
1030 */
1031 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1032 dev_mc_add(dev, buf);
1da177e4
LT		 1033}
1034
1035/*
1036 * Remove a filter from a device
1037 */
1038
63007727 1039static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1040{
1041 char buf[MAX_ADDR_LEN];
1042 struct net_device *dev = in_dev->dev;
1043
1044 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1045 dev_mc_del(dev, buf);
1da177e4
LT		 1046}
1047
1048#ifdef CONFIG_IP_MULTICAST
1049/*
1050 * deleted ip_mc_list manipulation
1051 */
1052static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1053{
1054 struct ip_mc_list *pmc;
1055
1056 /* this is an "ip_mc_list" for convenience; only the fields below
1057 * are actually used. In particular, the refcnt and users are not
1058 * used for management of the delete list. Using the same structure
1059 * for deleted items allows change reports to use common code with
1060 * non-deleted or query-response MCA's.
1061 */
0da974f4 1062 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1063 if (!pmc)
1064 return;
1da177e4
LT		 1065 spin_lock_bh(&im->lock);
1066 pmc->interface = im->interface;
1067 in_dev_hold(in_dev);
1068 pmc->multiaddr = im->multiaddr;
1069 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1070 IGMP_Unsolicited_Report_Count;
1071 pmc->sfmode = im->sfmode;
1072 if (pmc->sfmode == MCAST_INCLUDE) {
1073 struct ip_sf_list *psf;
1074
1075 pmc->tomb = im->tomb;
1076 pmc->sources = im->sources;
1077 im->tomb = im->sources = NULL;
1078 for (psf=pmc->sources; psf; psf=psf->sf_next)
1079 psf->sf_crcount = pmc->crcount;
1080 }
1081 spin_unlock_bh(&im->lock);
1082
1083 spin_lock_bh(&in_dev->mc_tomb_lock);
1084 pmc->next = in_dev->mc_tomb;
1085 in_dev->mc_tomb = pmc;
1086 spin_unlock_bh(&in_dev->mc_tomb_lock);
1087}
1088
63007727 1089static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1090{
1091 struct ip_mc_list *pmc, *pmc_prev;
1092 struct ip_sf_list *psf, *psf_next;
1093
1094 spin_lock_bh(&in_dev->mc_tomb_lock);
1095 pmc_prev = NULL;
1096 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1097 if (pmc->multiaddr == multiaddr)
1098 break;
1099 pmc_prev = pmc;
1100 }
1101 if (pmc) {
1102 if (pmc_prev)
1103 pmc_prev->next = pmc->next;
1104 else
1105 in_dev->mc_tomb = pmc->next;
1106 }
1107 spin_unlock_bh(&in_dev->mc_tomb_lock);
1108 if (pmc) {
1109 for (psf=pmc->tomb; psf; psf=psf_next) {
1110 psf_next = psf->sf_next;
1111 kfree(psf);
1112 }
1113 in_dev_put(pmc->interface);
1114 kfree(pmc);
1115 }
1116}
1117
1118static void igmpv3_clear_delrec(struct in_device *in_dev)
1119{
1120 struct ip_mc_list *pmc, *nextpmc;
1121
1122 spin_lock_bh(&in_dev->mc_tomb_lock);
1123 pmc = in_dev->mc_tomb;
1124 in_dev->mc_tomb = NULL;
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1126
1127 for (; pmc; pmc = nextpmc) {
1128 nextpmc = pmc->next;
1129 ip_mc_clear_src(pmc);
1130 in_dev_put(pmc->interface);
1131 kfree(pmc);
1132 }
1133 /* clear dead sources, too */
1d7138de
ED		 1134 rcu_read_lock();
1135 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1136 struct ip_sf_list *psf, *psf_next;
1137
1138 spin_lock_bh(&pmc->lock);
1139 psf = pmc->tomb;
1140 pmc->tomb = NULL;
1141 spin_unlock_bh(&pmc->lock);
1142 for (; psf; psf=psf_next) {
1143 psf_next = psf->sf_next;
1144 kfree(psf);
1145 }
1146 }
1d7138de 1147 rcu_read_unlock();
1da177e4
LT		 1148}
1149#endif
1150
1151static void igmp_group_dropped(struct ip_mc_list *im)
1152{
1153 struct in_device *in_dev = im->interface;
1154#ifdef CONFIG_IP_MULTICAST
1155 int reporter;
1156#endif
1157
1158 if (im->loaded) {
1159 im->loaded = 0;
1160 ip_mc_filter_del(in_dev, im->multiaddr);
1161 }
1162
1163#ifdef CONFIG_IP_MULTICAST
1164 if (im->multiaddr == IGMP_ALL_HOSTS)
1165 return;
1166
1167 reporter = im->reporter;
1168 igmp_stop_timer(im);
1169
1170 if (!in_dev->dead) {
1171 if (IGMP_V1_SEEN(in_dev))
24cf3af3 1172 return;
1da177e4
LT		 1173 if (IGMP_V2_SEEN(in_dev)) {
1174 if (reporter)
1175 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
24cf3af3 1176 return;
1da177e4
LT		 1177 }
1178 /* IGMPv3 */
1179 igmpv3_add_delrec(in_dev, im);
1180
1181 igmp_ifc_event(in_dev);
1182 }
1da177e4 1183#endif
1da177e4
LT		 1184}
1185
1186static void igmp_group_added(struct ip_mc_list *im)
1187{
1188 struct in_device *in_dev = im->interface;
1189
1190 if (im->loaded == 0) {
1191 im->loaded = 1;
1192 ip_mc_filter_add(in_dev, im->multiaddr);
1193 }
1194
1195#ifdef CONFIG_IP_MULTICAST
1196 if (im->multiaddr == IGMP_ALL_HOSTS)
1197 return;
1198
1199 if (in_dev->dead)
1200 return;
1201 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1202 spin_lock_bh(&im->lock);
1203 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1204 spin_unlock_bh(&im->lock);
1205 return;
1206 }
1207 /* else, v3 */
1208
1209 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1210 IGMP_Unsolicited_Report_Count;
1211 igmp_ifc_event(in_dev);
1212#endif
1213}
1214
1215
1216/*
1217 * Multicast list managers
1218 */
1219
1220
1221/*
1222 * A socket has joined a multicast group on device dev.
1223 */
1224
8f935bbd 1225void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1226{
1227 struct ip_mc_list *im;
1228
1229 ASSERT_RTNL();
1230
1d7138de 1231 for_each_pmc_rtnl(in_dev, im) {
1da177e4
LT		 1232 if (im->multiaddr == addr) {
1233 im->users++;
1234 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1235 goto out;
1236 }
1237 }
1238
1d7138de 1239 im = kzalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1240 if (!im)
1241 goto out;
1242
a7e9ff73
JK		 1243 im->users = 1;
1244 im->interface = in_dev;
1da177e4 1245 in_dev_hold(in_dev);
a7e9ff73 1246 im->multiaddr = addr;
1da177e4
LT		 1247 /* initial mode is (EX, empty) */
1248 im->sfmode = MCAST_EXCLUDE;
1da177e4 1249 im->sfcount[MCAST_EXCLUDE] = 1;
1da177e4
LT		 1250 atomic_set(&im->refcnt, 1);
1251 spin_lock_init(&im->lock);
1252#ifdef CONFIG_IP_MULTICAST
b24b8a24 1253 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1da177e4 1254 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1da177e4 1255#endif
1d7138de
ED		 1256
1257 im->next_rcu = in_dev->mc_list;
b8bae41e 1258 in_dev->mc_count++;
cf778b00 1259 rcu_assign_pointer(in_dev->mc_list, im);
1d7138de 1260
1da177e4
LT		 1261#ifdef CONFIG_IP_MULTICAST
1262 igmpv3_del_delrec(in_dev, im->multiaddr);
1263#endif
1264 igmp_group_added(im);
1265 if (!in_dev->dead)
1266 ip_rt_multicast_event(in_dev);
1267out:
1268 return;
1269}
4bc2f18b 1270EXPORT_SYMBOL(ip_mc_inc_group);
1da177e4 1271
a816c7c7
JV		 1272/*
1273 * Resend IGMP JOIN report; used for bonding.
866f3b25 1274 * Called with rcu_read_lock()
a816c7c7 1275 */
866f3b25 1276void ip_mc_rejoin_groups(struct in_device *in_dev)
a816c7c7 1277{
08882669 1278#ifdef CONFIG_IP_MULTICAST
866f3b25
ED		 1279 struct ip_mc_list *im;
1280 int type;
a816c7c7 1281
866f3b25
ED		 1282 for_each_pmc_rcu(in_dev, im) {
1283 if (im->multiaddr == IGMP_ALL_HOSTS)
1284 continue;
a816c7c7 1285
866f3b25
ED		 1286 /* a failover is happening and switches
1287 * must be notified immediately
1288 */
1289 if (IGMP_V1_SEEN(in_dev))
1290 type = IGMP_HOST_MEMBERSHIP_REPORT;
1291 else if (IGMP_V2_SEEN(in_dev))
1292 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1293 else
1294 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1295 igmp_send_report(in_dev, im, type);
1296 }
a816c7c7
JV		 1297#endif
1298}
866f3b25 1299EXPORT_SYMBOL(ip_mc_rejoin_groups);
a816c7c7 1300
1da177e4
LT		 1301/*
1302 * A socket has left a multicast group on device dev
1303 */
1304
8f935bbd 1305void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1da177e4 1306{
1d7138de
ED		 1307 struct ip_mc_list *i;
1308 struct ip_mc_list __rcu **ip;
e905a9ed 1309
1da177e4 1310 ASSERT_RTNL();
e905a9ed 1311
1d7138de
ED		 1312 for (ip = &in_dev->mc_list;
1313 (i = rtnl_dereference(*ip)) != NULL;
1314 ip = &i->next_rcu) {
a7e9ff73 1315 if (i->multiaddr == addr) {
1da177e4 1316 if (--i->users == 0) {
1d7138de 1317 *ip = i->next_rcu;
b8bae41e 1318 in_dev->mc_count--;
1da177e4 1319 igmp_group_dropped(i);
24cf3af3 1320 ip_mc_clear_src(i);
1da177e4
LT		 1321
1322 if (!in_dev->dead)
1323 ip_rt_multicast_event(in_dev);
1324
1325 ip_ma_put(i);
1326 return;
1327 }
1328 break;
1329 }
1330 }
1331}
4bc2f18b 1332EXPORT_SYMBOL(ip_mc_dec_group);
1da177e4 1333
75c78500
MS		 1334/* Device changing type */
1335
1336void ip_mc_unmap(struct in_device *in_dev)
1337{
1d7138de 1338 struct ip_mc_list *pmc;
75c78500
MS		 1339
1340 ASSERT_RTNL();
1341
1d7138de
ED		 1342 for_each_pmc_rtnl(in_dev, pmc)
1343 igmp_group_dropped(pmc);
75c78500
MS		 1344}
1345
1346void ip_mc_remap(struct in_device *in_dev)
1347{
1d7138de 1348 struct ip_mc_list *pmc;
75c78500
MS		 1349
1350 ASSERT_RTNL();
1351
1d7138de
ED		 1352 for_each_pmc_rtnl(in_dev, pmc)
1353 igmp_group_added(pmc);
75c78500
MS		 1354}
1355
1da177e4
LT		 1356/* Device going down */
1357
1358void ip_mc_down(struct in_device *in_dev)
1359{
1d7138de 1360 struct ip_mc_list *pmc;
1da177e4
LT		 1361
1362 ASSERT_RTNL();
1363
1d7138de
ED		 1364 for_each_pmc_rtnl(in_dev, pmc)
1365 igmp_group_dropped(pmc);
1da177e4
LT		 1366
1367#ifdef CONFIG_IP_MULTICAST
1368 in_dev->mr_ifc_count = 0;
1369 if (del_timer(&in_dev->mr_ifc_timer))
1370 __in_dev_put(in_dev);
1371 in_dev->mr_gq_running = 0;
1372 if (del_timer(&in_dev->mr_gq_timer))
1373 __in_dev_put(in_dev);
1374 igmpv3_clear_delrec(in_dev);
1375#endif
1376
1377 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1378}
1379
1380void ip_mc_init_dev(struct in_device *in_dev)
1381{
1382 ASSERT_RTNL();
1383
1384 in_dev->mc_tomb = NULL;
1385#ifdef CONFIG_IP_MULTICAST
1386 in_dev->mr_gq_running = 0;
b24b8a24
PE		 1387 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1388 (unsigned long)in_dev);
1da177e4 1389 in_dev->mr_ifc_count = 0;
b8bae41e 1390 in_dev->mc_count = 0;
b24b8a24
PE		 1391 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1392 (unsigned long)in_dev);
1da177e4
LT		 1393 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1394#endif
1395
1da177e4
LT		 1396 spin_lock_init(&in_dev->mc_tomb_lock);
1397}
1398
1399/* Device going up */
1400
1401void ip_mc_up(struct in_device *in_dev)
1402{
1d7138de 1403 struct ip_mc_list *pmc;
1da177e4
LT		 1404
1405 ASSERT_RTNL();
1406
1407 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1408
1d7138de
ED		 1409 for_each_pmc_rtnl(in_dev, pmc)
1410 igmp_group_added(pmc);
1da177e4
LT		 1411}
1412
1413/*
1414 * Device is about to be destroyed: clean up.
1415 */
1416
1417void ip_mc_destroy_dev(struct in_device *in_dev)
1418{
1419 struct ip_mc_list *i;
1420
1421 ASSERT_RTNL();
1422
1423 /* Deactivate timers */
1424 ip_mc_down(in_dev);
1425
1d7138de
ED		 1426 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1427 in_dev->mc_list = i->next_rcu;
b8bae41e 1428 in_dev->mc_count--;
1d7138de 1429
24cf3af3
VF		 1430 /* We've dropped the groups in ip_mc_down already */
1431 ip_mc_clear_src(i);
1da177e4 1432 ip_ma_put(i);
1da177e4 1433 }
1da177e4
LT		 1434}
1435
9e917dca 1436/* RTNL is locked */
877acedc 1437static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1da177e4 1438{
1da177e4
LT		 1439 struct net_device *dev = NULL;
1440 struct in_device *idev = NULL;
1441
1442 if (imr->imr_ifindex) {
877acedc 1443 idev = inetdev_by_index(net, imr->imr_ifindex);
1da177e4
LT		 1444 return idev;
1445 }
1446 if (imr->imr_address.s_addr) {
9e917dca 1447 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1da177e4
LT		 1448 if (!dev)
1449 return NULL;
1da177e4
LT		 1450 }
1451
b23dd4fe 1452 if (!dev) {
78fbfd8a
DM		 1453 struct rtable *rt = ip_route_output(net,
1454 imr->imr_multiaddr.s_addr,
1455 0, 0, 0);
b23dd4fe
DM		 1456 if (!IS_ERR(rt)) {
1457 dev = rt->dst.dev;
1458 ip_rt_put(rt);
1459 }
1da177e4
LT		 1460 }
1461 if (dev) {
1462 imr->imr_ifindex = dev->ifindex;
e5ed6399 1463 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1464 }
1465 return idev;
1466}
1467
1468/*
1469 * Join a socket to a group
1470 */
ab32ea5d
BH		 1471int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1472int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1da177e4
LT		 1473
1474
1475static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1476 __be32 *psfsrc)
1da177e4
LT		 1477{
1478 struct ip_sf_list *psf, *psf_prev;
1479 int rv = 0;
1480
1481 psf_prev = NULL;
1482 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1483 if (psf->sf_inaddr == *psfsrc)
1484 break;
1485 psf_prev = psf;
1486 }
1487 if (!psf || psf->sf_count[sfmode] == 0) {
1488 /* source filter not found, or count wrong => bug */
1489 return -ESRCH;
1490 }
1491 psf->sf_count[sfmode]--;
1492 if (psf->sf_count[sfmode] == 0) {
1493 ip_rt_multicast_event(pmc->interface);
1494 }
1495 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1496#ifdef CONFIG_IP_MULTICAST
1497 struct in_device *in_dev = pmc->interface;
1498#endif
1499
1500 /* no more filters for this source */
1501 if (psf_prev)
1502 psf_prev->sf_next = psf->sf_next;
1503 else
1504 pmc->sources = psf->sf_next;
1505#ifdef CONFIG_IP_MULTICAST
1506 if (psf->sf_oldin &&
1507 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
e905a9ed 1508 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1509 IGMP_Unsolicited_Report_Count;
1510 psf->sf_next = pmc->tomb;
1511 pmc->tomb = psf;
1512 rv = 1;
1513 } else
1514#endif
1515 kfree(psf);
1516 }
1517 return rv;
1518}
1519
1520#ifndef CONFIG_IP_MULTICAST
1521#define igmp_ifc_event(x) do { } while (0)
1522#endif
1523
8f935bbd
AV		 1524static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1525 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1526{
1527 struct ip_mc_list *pmc;
1528 int changerec = 0;
1529 int i, err;
1530
1531 if (!in_dev)
1532 return -ENODEV;
1d7138de
ED		 1533 rcu_read_lock();
1534 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1535 if (*pmca == pmc->multiaddr)
1536 break;
1537 }
1538 if (!pmc) {
1539 /* MCA not found?? bug */
1d7138de 1540 rcu_read_unlock();
1da177e4
LT		 1541 return -ESRCH;
1542 }
1543 spin_lock_bh(&pmc->lock);
1d7138de 1544 rcu_read_unlock();
1da177e4
LT		 1545#ifdef CONFIG_IP_MULTICAST
1546 sf_markstate(pmc);
1547#endif
1548 if (!delta) {
1549 err = -EINVAL;
1550 if (!pmc->sfcount[sfmode])
1551 goto out_unlock;
1552 pmc->sfcount[sfmode]--;
1553 }
1554 err = 0;
1555 for (i=0; i<sfcount; i++) {
1556 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1557
1558 changerec |= rv > 0;
1559 if (!err && rv < 0)
1560 err = rv;
1561 }
1562 if (pmc->sfmode == MCAST_EXCLUDE &&
1563 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1564 pmc->sfcount[MCAST_INCLUDE]) {
1565#ifdef CONFIG_IP_MULTICAST
1566 struct ip_sf_list *psf;
1567#endif
1568
1569 /* filter mode change */
1570 pmc->sfmode = MCAST_INCLUDE;
1571#ifdef CONFIG_IP_MULTICAST
e905a9ed 1572 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1573 IGMP_Unsolicited_Report_Count;
1574 in_dev->mr_ifc_count = pmc->crcount;
1575 for (psf=pmc->sources; psf; psf = psf->sf_next)
1576 psf->sf_crcount = 0;
1577 igmp_ifc_event(pmc->interface);
1578 } else if (sf_setstate(pmc) || changerec) {
1579 igmp_ifc_event(pmc->interface);
1580#endif
1581 }
1582out_unlock:
1583 spin_unlock_bh(&pmc->lock);
1584 return err;
1585}
1586
1587/*
1588 * Add multicast single-source filter to the interface list
1589 */
1590static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
5eb81e89 1591 __be32 *psfsrc)
1da177e4
LT		 1592{
1593 struct ip_sf_list *psf, *psf_prev;
1594
1595 psf_prev = NULL;
1596 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1597 if (psf->sf_inaddr == *psfsrc)
1598 break;
1599 psf_prev = psf;
1600 }
1601 if (!psf) {
0da974f4 1602 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1603 if (!psf)
1604 return -ENOBUFS;
1da177e4
LT		 1605 psf->sf_inaddr = *psfsrc;
1606 if (psf_prev) {
1607 psf_prev->sf_next = psf;
1608 } else
1609 pmc->sources = psf;
1610 }
1611 psf->sf_count[sfmode]++;
1612 if (psf->sf_count[sfmode] == 1) {
1613 ip_rt_multicast_event(pmc->interface);
1614 }
1615 return 0;
1616}
1617
1618#ifdef CONFIG_IP_MULTICAST
1619static void sf_markstate(struct ip_mc_list *pmc)
1620{
1621 struct ip_sf_list *psf;
1622 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1623
1624 for (psf=pmc->sources; psf; psf=psf->sf_next)
1625 if (pmc->sfcount[MCAST_EXCLUDE]) {
1626 psf->sf_oldin = mca_xcount ==
1627 psf->sf_count[MCAST_EXCLUDE] &&
1628 !psf->sf_count[MCAST_INCLUDE];
1629 } else
1630 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1631}
1632
1633static int sf_setstate(struct ip_mc_list *pmc)
1634{
ad12583f 1635 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1636 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1637 int qrv = pmc->interface->mr_qrv;
1638 int new_in, rv;
1639
1640 rv = 0;
1641 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1642 if (pmc->sfcount[MCAST_EXCLUDE]) {
1643 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1644 !psf->sf_count[MCAST_INCLUDE];
1645 } else
1646 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1647 if (new_in) {
1648 if (!psf->sf_oldin) {
76edc605 1649 struct ip_sf_list *prev = NULL;
ad12583f
DS		 1650
1651 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1652 if (dpsf->sf_inaddr == psf->sf_inaddr)
1653 break;
1654 prev = dpsf;
1655 }
1656 if (dpsf) {
1657 if (prev)
1658 prev->sf_next = dpsf->sf_next;
1659 else
1660 pmc->tomb = dpsf->sf_next;
1661 kfree(dpsf);
1662 }
1663 psf->sf_crcount = qrv;
1664 rv++;
1665 }
1666 } else if (psf->sf_oldin) {
1667
1668 psf->sf_crcount = 0;
1669 /*
1670 * add or update "delete" records if an active filter
1671 * is now inactive
1672 */
1673 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1674 if (dpsf->sf_inaddr == psf->sf_inaddr)
1675 break;
1676 if (!dpsf) {
3ed37a6f 1677 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
ad12583f
DS		 1678 if (!dpsf)
1679 continue;
1680 *dpsf = *psf;
1681 /* pmc->lock held by callers */
1682 dpsf->sf_next = pmc->tomb;
1683 pmc->tomb = dpsf;
1684 }
1685 dpsf->sf_crcount = qrv;
1da177e4
LT		 1686 rv++;
1687 }
1688 }
1689 return rv;
1690}
1691#endif
1692
1693/*
1694 * Add multicast source filter list to the interface list
1695 */
8f935bbd
AV		 1696static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1697 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1698{
1699 struct ip_mc_list *pmc;
1700 int isexclude;
1701 int i, err;
1702
1703 if (!in_dev)
1704 return -ENODEV;
1d7138de
ED		 1705 rcu_read_lock();
1706 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1707 if (*pmca == pmc->multiaddr)
1708 break;
1709 }
1710 if (!pmc) {
1711 /* MCA not found?? bug */
1d7138de 1712 rcu_read_unlock();
1da177e4
LT		 1713 return -ESRCH;
1714 }
1715 spin_lock_bh(&pmc->lock);
1d7138de 1716 rcu_read_unlock();
1da177e4
LT		 1717
1718#ifdef CONFIG_IP_MULTICAST
1719 sf_markstate(pmc);
1720#endif
1721 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1722 if (!delta)
1723 pmc->sfcount[sfmode]++;
1724 err = 0;
1725 for (i=0; i<sfcount; i++) {
5eb81e89 1726 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT		 1727 if (err)
1728 break;
1729 }
1730 if (err) {
1731 int j;
1732
685f94e6
JZ		 1733 if (!delta)
1734 pmc->sfcount[sfmode]--;
1da177e4 1735 for (j=0; j<i; j++)
a1889c0d 1736 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4
LT		 1737 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1738#ifdef CONFIG_IP_MULTICAST
1da177e4 1739 struct ip_sf_list *psf;
cfcabdcc 1740 in_dev = pmc->interface;
1da177e4
LT		 1741#endif
1742
1743 /* filter mode change */
1744 if (pmc->sfcount[MCAST_EXCLUDE])
1745 pmc->sfmode = MCAST_EXCLUDE;
1746 else if (pmc->sfcount[MCAST_INCLUDE])
1747 pmc->sfmode = MCAST_INCLUDE;
1748#ifdef CONFIG_IP_MULTICAST
1749 /* else no filters; keep old mode for reports */
1750
e905a9ed 1751 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1752 IGMP_Unsolicited_Report_Count;
1753 in_dev->mr_ifc_count = pmc->crcount;
1754 for (psf=pmc->sources; psf; psf = psf->sf_next)
1755 psf->sf_crcount = 0;
1756 igmp_ifc_event(in_dev);
1757 } else if (sf_setstate(pmc)) {
1758 igmp_ifc_event(in_dev);
1759#endif
1760 }
1761 spin_unlock_bh(&pmc->lock);
1762 return err;
1763}
1764
1765static void ip_mc_clear_src(struct ip_mc_list *pmc)
1766{
1767 struct ip_sf_list *psf, *nextpsf;
1768
1769 for (psf=pmc->tomb; psf; psf=nextpsf) {
1770 nextpsf = psf->sf_next;
1771 kfree(psf);
1772 }
1773 pmc->tomb = NULL;
1774 for (psf=pmc->sources; psf; psf=nextpsf) {
1775 nextpsf = psf->sf_next;
1776 kfree(psf);
1777 }
1778 pmc->sources = NULL;
1779 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1780 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1781 pmc->sfcount[MCAST_EXCLUDE] = 1;
1782}
1783
1784
1785/*
1786 * Join a multicast group
1787 */
1788int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1789{
1790 int err;
8f935bbd 1791 __be32 addr = imr->imr_multiaddr.s_addr;
a7e9ff73 1792 struct ip_mc_socklist *iml = NULL, *i;
1da177e4
LT		 1793 struct in_device *in_dev;
1794 struct inet_sock *inet = inet_sk(sk);
877acedc 1795 struct net *net = sock_net(sk);
ca9b907d 1796 int ifindex;
1da177e4
LT		 1797 int count = 0;
1798
f97c1e0c 1799 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1800 return -EINVAL;
1801
6756ae4b 1802 rtnl_lock();
1da177e4 1803
877acedc 1804 in_dev = ip_mc_find_dev(net, imr);
1da177e4
LT		 1805
1806 if (!in_dev) {
1807 iml = NULL;
1808 err = -ENODEV;
1809 goto done;
1810 }
1811
1da177e4 1812 err = -EADDRINUSE;
ca9b907d 1813 ifindex = imr->imr_ifindex;
1d7138de 1814 for_each_pmc_rtnl(inet, i) {
ca9b907d
DS		 1815 if (i->multi.imr_multiaddr.s_addr == addr &&
1816 i->multi.imr_ifindex == ifindex)
1da177e4 1817 goto done;
1da177e4
LT		 1818 count++;
1819 }
1820 err = -ENOBUFS;
ca9b907d
DS		 1821 if (count >= sysctl_igmp_max_memberships)
1822 goto done;
a7e9ff73 1823 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
ca9b907d 1824 if (iml == NULL)
1da177e4 1825 goto done;
ca9b907d 1826
1da177e4 1827 memcpy(&iml->multi, imr, sizeof(*imr));
1d7138de 1828 iml->next_rcu = inet->mc_list;
1da177e4
LT		 1829 iml->sflist = NULL;
1830 iml->sfmode = MCAST_EXCLUDE;
cf778b00 1831 rcu_assign_pointer(inet->mc_list, iml);
1da177e4 1832 ip_mc_inc_group(in_dev, addr);
1da177e4 1833 err = 0;
1da177e4 1834done:
6756ae4b 1835 rtnl_unlock();
1da177e4
LT		 1836 return err;
1837}
4bc2f18b 1838EXPORT_SYMBOL(ip_mc_join_group);
1da177e4
LT		 1839
1840static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1841 struct in_device *in_dev)
1842{
1d7138de 1843 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1da177e4
LT		 1844 int err;
1845
c85bb41e 1846 if (psf == NULL) {
1da177e4
LT		 1847 /* any-source empty exclude case */
1848 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1849 iml->sfmode, 0, NULL, 0);
1850 }
1851 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
c85bb41e 1852 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
a9b3cd7f 1853 RCU_INIT_POINTER(iml->sflist, NULL);
c85bb41e
FL		 1854 /* decrease mem now to avoid the memleak warning */
1855 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
7519cce4 1856 kfree_rcu(psf, rcu);
1da177e4
LT		 1857 return err;
1858}
1859
1860/*
1861 * Ask a socket to leave a group.
1862 */
1863
1864int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1865{
1866 struct inet_sock *inet = inet_sk(sk);
1d7138de
ED		 1867 struct ip_mc_socklist *iml;
1868 struct ip_mc_socklist __rcu **imlp;
84b42bae 1869 struct in_device *in_dev;
877acedc 1870 struct net *net = sock_net(sk);
8f935bbd 1871 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1872 u32 ifindex;
acd6e00b 1873 int ret = -EADDRNOTAVAIL;
1da177e4
LT		 1874
1875 rtnl_lock();
877acedc 1876 in_dev = ip_mc_find_dev(net, imr);
4fbf1009 1877 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
48b60bb7 1878 ret = -ENODEV;
1879 goto out;
1880 }
84b42bae 1881 ifindex = imr->imr_ifindex;
1d7138de
ED		 1882 for (imlp = &inet->mc_list;
1883 (iml = rtnl_dereference(*imlp)) != NULL;
1884 imlp = &iml->next_rcu) {
acd6e00b
DS		 1885 if (iml->multi.imr_multiaddr.s_addr != group)
1886 continue;
1887 if (ifindex) {
1888 if (iml->multi.imr_ifindex != ifindex)
1889 continue;
1890 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1891 iml->multi.imr_address.s_addr)
1892 continue;
1da177e4 1893
acd6e00b 1894 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4 1895
1d7138de 1896 *imlp = iml->next_rcu;
acd6e00b 1897
4fbf1009
AL		 1898 if (in_dev)
1899 ip_mc_dec_group(in_dev, group);
acd6e00b 1900 rtnl_unlock();
4fbf1009 1901
c85bb41e
FL		 1902 /* decrease mem now to avoid the memleak warning */
1903 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
10d50e74 1904 kfree_rcu(iml, rcu);
acd6e00b 1905 return 0;
1da177e4 1906 }
48b60bb7 1907out:
1da177e4 1908 rtnl_unlock();
acd6e00b 1909 return ret;
1da177e4 1910}
193ba924 1911EXPORT_SYMBOL(ip_mc_leave_group);
1da177e4
LT		 1912
1913int ip_mc_source(int add, int omode, struct sock *sk, struct
1914 ip_mreq_source *mreqs, int ifindex)
1915{
1916 int err;
1917 struct ip_mreqn imr;
63007727 1918 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 1919 struct ip_mc_socklist *pmc;
1920 struct in_device *in_dev = NULL;
1921 struct inet_sock *inet = inet_sk(sk);
1922 struct ip_sf_socklist *psl;
877acedc 1923 struct net *net = sock_net(sk);
8cdaaa15 1924 int leavegroup = 0;
1da177e4
LT		 1925 int i, j, rv;
1926
f97c1e0c 1927 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1928 return -EINVAL;
1929
6756ae4b 1930 rtnl_lock();
1da177e4
LT		 1931
1932 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1933 imr.imr_address.s_addr = mreqs->imr_interface;
1934 imr.imr_ifindex = ifindex;
877acedc 1935 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 1936
1937 if (!in_dev) {
1938 err = -ENODEV;
1939 goto done;
1940 }
1941 err = -EADDRNOTAVAIL;
1942
1d7138de 1943 for_each_pmc_rtnl(inet, pmc) {
f64f9e71
JP		 1944 if ((pmc->multi.imr_multiaddr.s_addr ==
1945 imr.imr_multiaddr.s_addr) &&
1946 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1da177e4
LT		 1947 break;
1948 }
917f2f10
DS		 1949 if (!pmc) { /* must have a prior join */
1950 err = -EINVAL;
1da177e4 1951 goto done;
917f2f10 1952 }
1da177e4
LT		 1953 /* if a source filter was set, must be the same mode as before */
1954 if (pmc->sflist) {
917f2f10
DS		 1955 if (pmc->sfmode != omode) {
1956 err = -EINVAL;
1da177e4 1957 goto done;
917f2f10 1958 }
1da177e4
LT		 1959 } else if (pmc->sfmode != omode) {
1960 /* allow mode switches for empty-set filters */
1961 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 1962 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 1963 NULL, 0);
1964 pmc->sfmode = omode;
1965 }
1966
1d7138de 1967 psl = rtnl_dereference(pmc->sflist);
1da177e4
LT		 1968 if (!add) {
1969 if (!psl)
917f2f10 1970 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1971 rv = !0;
1972 for (i=0; i<psl->sl_count; i++) {
1973 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1974 sizeof(__be32));
1da177e4
LT		 1975 if (rv == 0)
1976 break;
1977 }
1978 if (rv) /* source not found */
917f2f10 1979 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1980
8cdaaa15
DS		 1981 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1982 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1983 leavegroup = 1;
1984 goto done;
1985 }
1986
1da177e4 1987 /* update the interface filter */
e905a9ed 1988 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1989 &mreqs->imr_sourceaddr, 1);
1990
1991 for (j=i+1; j<psl->sl_count; j++)
1992 psl->sl_addr[j-1] = psl->sl_addr[j];
1993 psl->sl_count--;
1994 err = 0;
1995 goto done;
1996 }
1997 /* else, add a new source to the filter */
1998
1999 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2000 err = -ENOBUFS;
2001 goto done;
2002 }
2003 if (!psl || psl->sl_count == psl->sl_max) {
2004 struct ip_sf_socklist *newpsl;
2005 int count = IP_SFBLOCK;
2006
2007 if (psl)
2008 count += psl->sl_max;
8b3a7005 2009 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 2010 if (!newpsl) {
2011 err = -ENOBUFS;
2012 goto done;
2013 }
2014 newpsl->sl_max = count;
2015 newpsl->sl_count = count - IP_SFBLOCK;
2016 if (psl) {
2017 for (i=0; i<psl->sl_count; i++)
2018 newpsl->sl_addr[i] = psl->sl_addr[i];
c85bb41e
FL		 2019 /* decrease mem now to avoid the memleak warning */
2020 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
7519cce4 2021 kfree_rcu(psl, rcu);
1da177e4 2022 }
cf778b00 2023 rcu_assign_pointer(pmc->sflist, newpsl);
c85bb41e 2024 psl = newpsl;
1da177e4
LT		 2025 }
2026 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2027 for (i=0; i<psl->sl_count; i++) {
2028 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 2029 sizeof(__be32));
1da177e4
LT		 2030 if (rv == 0)
2031 break;
2032 }
2033 if (rv == 0) /* address already there is an error */
2034 goto done;
2035 for (j=psl->sl_count-1; j>=i; j--)
2036 psl->sl_addr[j+1] = psl->sl_addr[j];
2037 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2038 psl->sl_count++;
2039 err = 0;
2040 /* update the interface list */
e905a9ed 2041 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 2042 &mreqs->imr_sourceaddr, 1);
2043done:
6756ae4b 2044 rtnl_unlock();
8cdaaa15
DS		 2045 if (leavegroup)
2046 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2047 return err;
2048}
2049
2050int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2051{
9951f036 2052 int err = 0;
1da177e4 2053 struct ip_mreqn imr;
63007727 2054 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2055 struct ip_mc_socklist *pmc;
2056 struct in_device *in_dev;
2057 struct inet_sock *inet = inet_sk(sk);
2058 struct ip_sf_socklist *newpsl, *psl;
877acedc 2059 struct net *net = sock_net(sk);
9951f036 2060 int leavegroup = 0;
1da177e4 2061
f97c1e0c 2062 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2063 return -EINVAL;
2064 if (msf->imsf_fmode != MCAST_INCLUDE &&
2065 msf->imsf_fmode != MCAST_EXCLUDE)
2066 return -EINVAL;
2067
6756ae4b 2068 rtnl_lock();
1da177e4
LT		 2069
2070 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2071 imr.imr_address.s_addr = msf->imsf_interface;
2072 imr.imr_ifindex = ifindex;
877acedc 2073 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2074
2075 if (!in_dev) {
2076 err = -ENODEV;
2077 goto done;
2078 }
1da177e4 2079
9951f036
DS		 2080 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2081 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2082 leavegroup = 1;
2083 goto done;
2084 }
2085
1d7138de 2086 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2087 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2088 pmc->multi.imr_ifindex == imr.imr_ifindex)
2089 break;
2090 }
917f2f10
DS		 2091 if (!pmc) { /* must have a prior join */
2092 err = -EINVAL;
1da177e4 2093 goto done;
917f2f10 2094 }
1da177e4 2095 if (msf->imsf_numsrc) {
8b3a7005
KK		 2096 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2097 GFP_KERNEL);
1da177e4
LT		 2098 if (!newpsl) {
2099 err = -ENOBUFS;
2100 goto done;
2101 }
2102 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2103 memcpy(newpsl->sl_addr, msf->imsf_slist,
2104 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2105 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2106 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2107 if (err) {
2108 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2109 goto done;
2110 }
8713dbf0 2111 } else {
1da177e4 2112 newpsl = NULL;
8713dbf0
YZ		 2113 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2114 msf->imsf_fmode, 0, NULL, 0);
2115 }
1d7138de 2116 psl = rtnl_dereference(pmc->sflist);
1da177e4
LT		 2117 if (psl) {
2118 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2119 psl->sl_count, psl->sl_addr, 0);
c85bb41e
FL		 2120 /* decrease mem now to avoid the memleak warning */
2121 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
7519cce4 2122 kfree_rcu(psl, rcu);
1da177e4
LT		 2123 } else
2124 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2125 0, NULL, 0);
cf778b00 2126 rcu_assign_pointer(pmc->sflist, newpsl);
1da177e4 2127 pmc->sfmode = msf->imsf_fmode;
917f2f10 2128 err = 0;
1da177e4 2129done:
6756ae4b 2130 rtnl_unlock();
9951f036
DS		 2131 if (leavegroup)
2132 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2133 return err;
2134}
2135
2136int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2137 struct ip_msfilter __user *optval, int __user *optlen)
2138{
2139 int err, len, count, copycount;
2140 struct ip_mreqn imr;
63007727 2141 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2142 struct ip_mc_socklist *pmc;
2143 struct in_device *in_dev;
2144 struct inet_sock *inet = inet_sk(sk);
2145 struct ip_sf_socklist *psl;
877acedc 2146 struct net *net = sock_net(sk);
1da177e4 2147
f97c1e0c 2148 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2149 return -EINVAL;
2150
6756ae4b 2151 rtnl_lock();
1da177e4
LT		 2152
2153 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2154 imr.imr_address.s_addr = msf->imsf_interface;
2155 imr.imr_ifindex = 0;
877acedc 2156 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2157
2158 if (!in_dev) {
2159 err = -ENODEV;
2160 goto done;
2161 }
2162 err = -EADDRNOTAVAIL;
2163
1d7138de 2164 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2165 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2166 pmc->multi.imr_ifindex == imr.imr_ifindex)
2167 break;
2168 }
2169 if (!pmc) /* must have a prior join */
2170 goto done;
2171 msf->imsf_fmode = pmc->sfmode;
1d7138de 2172 psl = rtnl_dereference(pmc->sflist);
6756ae4b 2173 rtnl_unlock();
1da177e4
LT		 2174 if (!psl) {
2175 len = 0;
2176 count = 0;
2177 } else {
2178 count = psl->sl_count;
2179 }
2180 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2181 len = copycount * sizeof(psl->sl_addr[0]);
2182 msf->imsf_numsrc = count;
2183 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2184 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2185 return -EFAULT;
2186 }
2187 if (len &&
2188 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2189 return -EFAULT;
2190 return 0;
2191done:
6756ae4b 2192 rtnl_unlock();
1da177e4
LT		 2193 return err;
2194}
2195
2196int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2197 struct group_filter __user *optval, int __user *optlen)
2198{
2199 int err, i, count, copycount;
2200 struct sockaddr_in *psin;
63007727 2201 __be32 addr;
1da177e4
LT		 2202 struct ip_mc_socklist *pmc;
2203 struct inet_sock *inet = inet_sk(sk);
2204 struct ip_sf_socklist *psl;
2205
2206 psin = (struct sockaddr_in *)&gsf->gf_group;
2207 if (psin->sin_family != AF_INET)
2208 return -EINVAL;
2209 addr = psin->sin_addr.s_addr;
f97c1e0c 2210 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2211 return -EINVAL;
2212
6756ae4b 2213 rtnl_lock();
1da177e4
LT		 2214
2215 err = -EADDRNOTAVAIL;
2216
1d7138de 2217 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2218 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2219 pmc->multi.imr_ifindex == gsf->gf_interface)
2220 break;
2221 }
2222 if (!pmc) /* must have a prior join */
2223 goto done;
2224 gsf->gf_fmode = pmc->sfmode;
1d7138de 2225 psl = rtnl_dereference(pmc->sflist);
6756ae4b 2226 rtnl_unlock();
1da177e4
LT		 2227 count = psl ? psl->sl_count : 0;
2228 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2229 gsf->gf_numsrc = count;
2230 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2231 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2232 return -EFAULT;
2233 }
2234 for (i=0; i<copycount; i++) {
1da177e4
LT		 2235 struct sockaddr_storage ss;
2236
2237 psin = (struct sockaddr_in *)&ss;
2238 memset(&ss, 0, sizeof(ss));
2239 psin->sin_family = AF_INET;
2240 psin->sin_addr.s_addr = psl->sl_addr[i];
2241 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2242 return -EFAULT;
2243 }
2244 return 0;
2245done:
6756ae4b 2246 rtnl_unlock();
1da177e4
LT		 2247 return err;
2248}
2249
2250/*
2251 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2252 */
c0cda068 2253int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2254{
2255 struct inet_sock *inet = inet_sk(sk);
2256 struct ip_mc_socklist *pmc;
2257 struct ip_sf_socklist *psl;
2258 int i;
c85bb41e 2259 int ret;
1da177e4 2260
c85bb41e 2261 ret = 1;
f97c1e0c 2262 if (!ipv4_is_multicast(loc_addr))
c85bb41e 2263 goto out;
1da177e4 2264
c85bb41e 2265 rcu_read_lock();
1d7138de 2266 for_each_pmc_rcu(inet, pmc) {
1da177e4
LT		 2267 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2268 pmc->multi.imr_ifindex == dif)
2269 break;
2270 }
c85bb41e 2271 ret = inet->mc_all;
1da177e4 2272 if (!pmc)
c85bb41e 2273 goto unlock;
1d7138de 2274 psl = rcu_dereference(pmc->sflist);
c85bb41e 2275 ret = (pmc->sfmode == MCAST_EXCLUDE);
1da177e4 2276 if (!psl)
c85bb41e 2277 goto unlock;
1da177e4
LT		 2278
2279 for (i=0; i<psl->sl_count; i++) {
2280 if (psl->sl_addr[i] == rmt_addr)
2281 break;
2282 }
c85bb41e 2283 ret = 0;
1da177e4 2284 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
c85bb41e 2285 goto unlock;
1da177e4 2286 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
c85bb41e
FL		 2287 goto unlock;
2288 ret = 1;
2289unlock:
2290 rcu_read_unlock();
2291out:
2292 return ret;
1da177e4
LT		 2293}
2294
2295/*
2296 * A socket is closing.
2297 */
2298
2299void ip_mc_drop_socket(struct sock *sk)
2300{
2301 struct inet_sock *inet = inet_sk(sk);
2302 struct ip_mc_socklist *iml;
877acedc 2303 struct net *net = sock_net(sk);
1da177e4
LT		 2304
2305 if (inet->mc_list == NULL)
2306 return;
2307
2308 rtnl_lock();
1d7138de 2309 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
1da177e4 2310 struct in_device *in_dev;
1da177e4 2311
1d7138de 2312 inet->mc_list = iml->next_rcu;
877acedc 2313 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
bb699cbc 2314 (void) ip_mc_leave_src(sk, iml, in_dev);
18943d29 2315 if (in_dev != NULL)
1da177e4 2316 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
c85bb41e
FL		 2317 /* decrease mem now to avoid the memleak warning */
2318 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
10d50e74 2319 kfree_rcu(iml, rcu);
1da177e4
LT		 2320 }
2321 rtnl_unlock();
2322}
2323
dbdd9a52
DM		 2324/* called with rcu_read_lock() */
2325int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2326{
2327 struct ip_mc_list *im;
2328 struct ip_sf_list *psf;
2329 int rv = 0;
2330
1d7138de 2331 for_each_pmc_rcu(in_dev, im) {
1da177e4
LT		 2332 if (im->multiaddr == mc_addr)
2333 break;
2334 }
2335 if (im && proto == IPPROTO_IGMP) {
2336 rv = 1;
2337 } else if (im) {
2338 if (src_addr) {
2339 for (psf=im->sources; psf; psf=psf->sf_next) {
2340 if (psf->sf_inaddr == src_addr)
2341 break;
2342 }
2343 if (psf)
2344 rv = psf->sf_count[MCAST_INCLUDE] ||
2345 psf->sf_count[MCAST_EXCLUDE] !=
2346 im->sfcount[MCAST_EXCLUDE];
2347 else
2348 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2349 } else
2350 rv = 1; /* unspecified source; tentatively allow */
2351 }
1da177e4
LT		 2352 return rv;
2353}
2354
2355#if defined(CONFIG_PROC_FS)
2356struct igmp_mc_iter_state {
7091e728 2357 struct seq_net_private p;
1da177e4
LT		 2358 struct net_device *dev;
2359 struct in_device *in_dev;
2360};
2361
2362#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2363
2364static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2365{
7091e728 2366 struct net *net = seq_file_net(seq);
1da177e4
LT		 2367 struct ip_mc_list *im = NULL;
2368 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2369
7562f876 2370 state->in_dev = NULL;
61fbab77 2371 for_each_netdev_rcu(net, state->dev) {
1da177e4 2372 struct in_device *in_dev;
6baff150
ED		 2373
2374 in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2375 if (!in_dev)
2376 continue;
1d7138de 2377 im = rcu_dereference(in_dev->mc_list);
1da177e4
LT		 2378 if (im) {
2379 state->in_dev = in_dev;
2380 break;
2381 }
1da177e4
LT		 2382 }
2383 return im;
2384}
2385
2386static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2387{
2388 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
6baff150 2389
1d7138de
ED		 2390 im = rcu_dereference(im->next_rcu);
2391 while (!im) {
6baff150 2392 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2393 if (!state->dev) {
2394 state->in_dev = NULL;
2395 break;
2396 }
6baff150 2397 state->in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2398 if (!state->in_dev)
2399 continue;
1d7138de 2400 im = rcu_dereference(state->in_dev->mc_list);
1da177e4
LT		 2401 }
2402 return im;
2403}
2404
2405static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2406{
2407 struct ip_mc_list *im = igmp_mc_get_first(seq);
2408 if (im)
2409 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2410 --pos;
2411 return pos ? NULL : im;
2412}
2413
2414static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2415 __acquires(rcu)
1da177e4 2416{
61fbab77 2417 rcu_read_lock();
1da177e4
LT		 2418 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2419}
2420
2421static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2422{
2423 struct ip_mc_list *im;
2424 if (v == SEQ_START_TOKEN)
2425 im = igmp_mc_get_first(seq);
2426 else
2427 im = igmp_mc_get_next(seq, v);
2428 ++*pos;
2429 return im;
2430}
2431
2432static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
61fbab77 2433 __releases(rcu)
1da177e4
LT		 2434{
2435 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
1d7138de
ED		 2436
2437 state->in_dev = NULL;
1da177e4 2438 state->dev = NULL;
61fbab77 2439 rcu_read_unlock();
1da177e4
LT		 2440}
2441
2442static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2443{
2444 if (v == SEQ_START_TOKEN)
e905a9ed 2445 seq_puts(seq,
1da177e4
LT		 2446 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2447 else {
2448 struct ip_mc_list *im = (struct ip_mc_list *)v;
2449 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2450 char *querier;
a399a805
ED		 2451 long delta;
2452
1da177e4
LT		 2453#ifdef CONFIG_IP_MULTICAST
2454 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2455 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2456 "V3";
2457#else
2458 querier = "NONE";
2459#endif
2460
1d7138de 2461 if (rcu_dereference(state->in_dev->mc_list) == im) {
1da177e4 2462 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
b8bae41e 2463 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
1da177e4
LT		 2464 }
2465
a399a805 2466 delta = im->timer.expires - jiffies;
1da177e4 2467 seq_printf(seq,
338fcf98 2468 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4 2469 im->multiaddr, im->users,
a399a805
ED		 2470 im->tm_running,
2471 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
1da177e4
LT		 2472 im->reporter);
2473 }
2474 return 0;
2475}
2476
f690808e 2477static const struct seq_operations igmp_mc_seq_ops = {
1da177e4
LT		 2478 .start = igmp_mc_seq_start,
2479 .next = igmp_mc_seq_next,
2480 .stop = igmp_mc_seq_stop,
2481 .show = igmp_mc_seq_show,
2482};
2483
2484static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2485{
7091e728 2486 return seq_open_net(inode, file, &igmp_mc_seq_ops,
cf7732e4 2487 sizeof(struct igmp_mc_iter_state));
1da177e4
LT		 2488}
2489
9a32144e 2490static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2491 .owner = THIS_MODULE,
2492 .open = igmp_mc_seq_open,
2493 .read = seq_read,
2494 .llseek = seq_lseek,
7091e728 2495 .release = seq_release_net,
1da177e4
LT		 2496};
2497
2498struct igmp_mcf_iter_state {
7091e728 2499 struct seq_net_private p;
1da177e4
LT		 2500 struct net_device *dev;
2501 struct in_device *idev;
2502 struct ip_mc_list *im;
2503};
2504
2505#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2506
2507static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2508{
7091e728 2509 struct net *net = seq_file_net(seq);
1da177e4
LT		 2510 struct ip_sf_list *psf = NULL;
2511 struct ip_mc_list *im = NULL;
2512 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2513
7562f876
PE		 2514 state->idev = NULL;
2515 state->im = NULL;
61fbab77 2516 for_each_netdev_rcu(net, state->dev) {
1da177e4 2517 struct in_device *idev;
6baff150 2518 idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2519 if (unlikely(idev == NULL))
2520 continue;
1d7138de 2521 im = rcu_dereference(idev->mc_list);
1da177e4
LT		 2522 if (likely(im != NULL)) {
2523 spin_lock_bh(&im->lock);
2524 psf = im->sources;
2525 if (likely(psf != NULL)) {
2526 state->im = im;
2527 state->idev = idev;
2528 break;
2529 }
2530 spin_unlock_bh(&im->lock);
2531 }
1da177e4
LT		 2532 }
2533 return psf;
2534}
2535
2536static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2537{
2538 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2539
2540 psf = psf->sf_next;
2541 while (!psf) {
2542 spin_unlock_bh(&state->im->lock);
2543 state->im = state->im->next;
2544 while (!state->im) {
6baff150 2545 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2546 if (!state->dev) {
2547 state->idev = NULL;
2548 goto out;
2549 }
6baff150 2550 state->idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2551 if (!state->idev)
2552 continue;
1d7138de 2553 state->im = rcu_dereference(state->idev->mc_list);
1da177e4
LT		 2554 }
2555 if (!state->im)
2556 break;
2557 spin_lock_bh(&state->im->lock);
2558 psf = state->im->sources;
2559 }
2560out:
2561 return psf;
2562}
2563
2564static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2565{
2566 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2567 if (psf)
2568 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2569 --pos;
2570 return pos ? NULL : psf;
2571}
2572
2573static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2574 __acquires(rcu)
1da177e4 2575{
61fbab77 2576 rcu_read_lock();
1da177e4
LT		 2577 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2578}
2579
2580static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2581{
2582 struct ip_sf_list *psf;
2583 if (v == SEQ_START_TOKEN)
2584 psf = igmp_mcf_get_first(seq);
2585 else
2586 psf = igmp_mcf_get_next(seq, v);
2587 ++*pos;
2588 return psf;
2589}
2590
2591static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
61fbab77 2592 __releases(rcu)
1da177e4
LT		 2593{
2594 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2595 if (likely(state->im != NULL)) {
2596 spin_unlock_bh(&state->im->lock);
2597 state->im = NULL;
2598 }
1d7138de 2599 state->idev = NULL;
1da177e4 2600 state->dev = NULL;
61fbab77 2601 rcu_read_unlock();
1da177e4
LT		 2602}
2603
2604static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2605{
2606 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2607 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2608
2609 if (v == SEQ_START_TOKEN) {
e905a9ed 2610 seq_printf(seq,
1da177e4
LT		 2611 "%3s %6s "
2612 "%10s %10s %6s %6s\n", "Idx",
2613 "Device", "MCA",
2614 "SRC", "INC", "EXC");
2615 } else {
2616 seq_printf(seq,
2617 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2618 "0x%08x %6lu %6lu\n",
2619 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2620 ntohl(state->im->multiaddr),
2621 ntohl(psf->sf_inaddr),
2622 psf->sf_count[MCAST_INCLUDE],
2623 psf->sf_count[MCAST_EXCLUDE]);
2624 }
2625 return 0;
2626}
2627
f690808e 2628static const struct seq_operations igmp_mcf_seq_ops = {
1da177e4
LT		 2629 .start = igmp_mcf_seq_start,
2630 .next = igmp_mcf_seq_next,
2631 .stop = igmp_mcf_seq_stop,
2632 .show = igmp_mcf_seq_show,
2633};
2634
2635static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2636{
7091e728 2637 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
cf7732e4 2638 sizeof(struct igmp_mcf_iter_state));
1da177e4
LT		 2639}
2640
9a32144e 2641static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2642 .owner = THIS_MODULE,
2643 .open = igmp_mcf_seq_open,
2644 .read = seq_read,
2645 .llseek = seq_lseek,
7091e728 2646 .release = seq_release_net,
1da177e4
LT		 2647};
2648
2c8c1e72 2649static int __net_init igmp_net_init(struct net *net)
1da177e4 2650{
7091e728
AD		 2651 struct proc_dir_entry *pde;
2652
d4beaa66 2653 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
7091e728
AD		 2654 if (!pde)
2655 goto out_igmp;
d4beaa66
G		 2656 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2657 &igmp_mcf_seq_fops);
7091e728
AD		 2658 if (!pde)
2659 goto out_mcfilter;
1da177e4 2660 return 0;
7091e728
AD		 2661
2662out_mcfilter:
ece31ffd 2663 remove_proc_entry("igmp", net->proc_net);
7091e728
AD		 2664out_igmp:
2665 return -ENOMEM;
2666}
2667
2c8c1e72 2668static void __net_exit igmp_net_exit(struct net *net)
7091e728 2669{
ece31ffd
G		 2670 remove_proc_entry("mcfilter", net->proc_net);
2671 remove_proc_entry("igmp", net->proc_net);
7091e728
AD		 2672}
2673
2674static struct pernet_operations igmp_net_ops = {
2675 .init = igmp_net_init,
2676 .exit = igmp_net_exit,
2677};
2678
2679int __init igmp_mc_proc_init(void)
2680{
2681 return register_pernet_subsys(&igmp_net_ops);
1da177e4
LT		 2682}
2683#endif
kernel source for telekom puls (alcatel/mediatek)