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Merge branch 'netdev_tracing'
[deliverable/linux.git] / net / ipv4 / igmp.c
CommitLineData
1da177e4
LT		 1/*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
1da177e4 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>
9d4a0314 91#include <linux/pkt_sched.h>
14c85021 92
457c4cbc 93#include <net/net_namespace.h>
14c85021 94#include <net/arp.h>
1da177e4
LT		 95#include <net/ip.h>
96#include <net/protocol.h>
97#include <net/route.h>
98#include <net/sock.h>
99#include <net/checksum.h>
100#include <linux/netfilter_ipv4.h>
101#ifdef CONFIG_IP_MROUTE
102#include <linux/mroute.h>
103#endif
104#ifdef CONFIG_PROC_FS
105#include <linux/proc_fs.h>
106#include <linux/seq_file.h>
107#endif
108
109#define IP_MAX_MEMBERSHIPS 20
110#define IP_MAX_MSF 10
111
112#ifdef CONFIG_IP_MULTICAST
113/* Parameter names and values are taken from igmp-v2-06 draft */
114
115#define IGMP_V1_Router_Present_Timeout (400*HZ)
116#define IGMP_V2_Router_Present_Timeout (400*HZ)
cab70040
WM		 117#define IGMP_V2_Unsolicited_Report_Interval (10*HZ)
118#define IGMP_V3_Unsolicited_Report_Interval (1*HZ)
1da177e4
LT		 119#define IGMP_Query_Response_Interval (10*HZ)
120#define IGMP_Unsolicited_Report_Count 2
121
122
123#define IGMP_Initial_Report_Delay (1)
124
125/* IGMP_Initial_Report_Delay is not from IGMP specs!
126 * IGMP specs require to report membership immediately after
127 * joining a group, but we delay the first report by a
128 * small interval. It seems more natural and still does not
129 * contradict to specs provided this delay is small enough.
130 */
131
42f811b8 132#define IGMP_V1_SEEN(in_dev) \
c346dca1 133 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
42f811b8
HX		 134 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
135 ((in_dev)->mr_v1_seen && \
136 time_before(jiffies, (in_dev)->mr_v1_seen)))
137#define IGMP_V2_SEEN(in_dev) \
c346dca1 138 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
42f811b8
HX		 139 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
140 ((in_dev)->mr_v2_seen && \
141 time_before(jiffies, (in_dev)->mr_v2_seen)))
1da177e4 142
cab70040
WM		 143static int unsolicited_report_interval(struct in_device *in_dev)
144{
2690048c
WM		 145 int interval_ms, interval_jiffies;
146
cab70040 147 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
2690048c
WM		 148 interval_ms = IN_DEV_CONF_GET(
149 in_dev,
150 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
cab70040 151 else /* v3 */
2690048c
WM		 152 interval_ms = IN_DEV_CONF_GET(
153 in_dev,
154 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
155
156 interval_jiffies = msecs_to_jiffies(interval_ms);
157
158 /* _timer functions can't handle a delay of 0 jiffies so ensure
159 * we always return a positive value.
160 */
161 if (interval_jiffies <= 0)
162 interval_jiffies = 1;
163 return interval_jiffies;
cab70040
WM		 164}
165
1da177e4 166static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
63007727 167static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
1da177e4
LT		 168static void igmpv3_clear_delrec(struct in_device *in_dev);
169static int sf_setstate(struct ip_mc_list *pmc);
170static void sf_markstate(struct ip_mc_list *pmc);
171#endif
172static void ip_mc_clear_src(struct ip_mc_list *pmc);
8f935bbd
AV		 173static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
174 int sfcount, __be32 *psfsrc, int delta);
1da177e4
LT		 175
176static void ip_ma_put(struct ip_mc_list *im)
177{
178 if (atomic_dec_and_test(&im->refcnt)) {
179 in_dev_put(im->interface);
42ea299d 180 kfree_rcu(im, rcu);
1da177e4
LT		 181 }
182}
183
d9aa9380
DM		 184#define for_each_pmc_rcu(in_dev, pmc) \
185 for (pmc = rcu_dereference(in_dev->mc_list); \
186 pmc != NULL; \
187 pmc = rcu_dereference(pmc->next_rcu))
188
189#define for_each_pmc_rtnl(in_dev, pmc) \
190 for (pmc = rtnl_dereference(in_dev->mc_list); \
191 pmc != NULL; \
192 pmc = rtnl_dereference(pmc->next_rcu))
193
1da177e4
LT		 194#ifdef CONFIG_IP_MULTICAST
195
196/*
197 * Timer management
198 */
199
1d7138de 200static void igmp_stop_timer(struct ip_mc_list *im)
1da177e4
LT		 201{
202 spin_lock_bh(&im->lock);
203 if (del_timer(&im->timer))
204 atomic_dec(&im->refcnt);
a7e9ff73 205 im->tm_running = 0;
1da177e4
LT		 206 im->reporter = 0;
207 im->unsolicit_count = 0;
208 spin_unlock_bh(&im->lock);
209}
210
211/* It must be called with locked im->lock */
212static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
213{
a7e9ff73 214 int tv = net_random() % max_delay;
1da177e4 215
a7e9ff73 216 im->tm_running = 1;
1da177e4
LT		 217 if (!mod_timer(&im->timer, jiffies+tv+2))
218 atomic_inc(&im->refcnt);
219}
220
221static void igmp_gq_start_timer(struct in_device *in_dev)
222{
223 int tv = net_random() % in_dev->mr_maxdelay;
224
225 in_dev->mr_gq_running = 1;
226 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
227 in_dev_hold(in_dev);
228}
229
230static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
231{
232 int tv = net_random() % delay;
233
234 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
235 in_dev_hold(in_dev);
236}
237
238static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
239{
240 spin_lock_bh(&im->lock);
241 im->unsolicit_count = 0;
242 if (del_timer(&im->timer)) {
243 if ((long)(im->timer.expires-jiffies) < max_delay) {
244 add_timer(&im->timer);
a7e9ff73 245 im->tm_running = 1;
1da177e4
LT		 246 spin_unlock_bh(&im->lock);
247 return;
248 }
249 atomic_dec(&im->refcnt);
250 }
251 igmp_start_timer(im, max_delay);
252 spin_unlock_bh(&im->lock);
253}
254
255
256/*
257 * Send an IGMP report.
258 */
259
260#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
261
262
263static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
264 int gdeleted, int sdeleted)
265{
266 switch (type) {
267 case IGMPV3_MODE_IS_INCLUDE:
268 case IGMPV3_MODE_IS_EXCLUDE:
269 if (gdeleted || sdeleted)
270 return 0;
ad12583f
DS		 271 if (!(pmc->gsquery && !psf->sf_gsresp)) {
272 if (pmc->sfmode == MCAST_INCLUDE)
273 return 1;
274 /* don't include if this source is excluded
275 * in all filters
276 */
277 if (psf->sf_count[MCAST_INCLUDE])
278 return type == IGMPV3_MODE_IS_INCLUDE;
279 return pmc->sfcount[MCAST_EXCLUDE] ==
280 psf->sf_count[MCAST_EXCLUDE];
281 }
282 return 0;
1da177e4
LT		 283 case IGMPV3_CHANGE_TO_INCLUDE:
284 if (gdeleted || sdeleted)
285 return 0;
286 return psf->sf_count[MCAST_INCLUDE] != 0;
287 case IGMPV3_CHANGE_TO_EXCLUDE:
288 if (gdeleted || sdeleted)
289 return 0;
290 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
291 psf->sf_count[MCAST_INCLUDE])
292 return 0;
293 return pmc->sfcount[MCAST_EXCLUDE] ==
294 psf->sf_count[MCAST_EXCLUDE];
295 case IGMPV3_ALLOW_NEW_SOURCES:
296 if (gdeleted || !psf->sf_crcount)
297 return 0;
298 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
299 case IGMPV3_BLOCK_OLD_SOURCES:
300 if (pmc->sfmode == MCAST_INCLUDE)
301 return gdeleted || (psf->sf_crcount && sdeleted);
302 return psf->sf_crcount && !gdeleted && !sdeleted;
303 }
304 return 0;
305}
306
307static int
308igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
309{
310 struct ip_sf_list *psf;
311 int scount = 0;
312
c71151f0 313 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 314 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
315 continue;
316 scount++;
317 }
318 return scount;
319}
320
57e1ab6e
ED		 321#define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
322
1da177e4
LT		 323static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
324{
325 struct sk_buff *skb;
326 struct rtable *rt;
327 struct iphdr *pip;
328 struct igmpv3_report *pig;
877acedc 329 struct net *net = dev_net(dev);
31e4543d 330 struct flowi4 fl4;
66088243
HX		 331 int hlen = LL_RESERVED_SPACE(dev);
332 int tlen = dev->needed_tailroom;
1da177e4 333
57e1ab6e 334 while (1) {
66088243 335 skb = alloc_skb(size + hlen + tlen,
57e1ab6e
ED		 336 GFP_ATOMIC | __GFP_NOWARN);
337 if (skb)
338 break;
339 size >>= 1;
340 if (size < 256)
341 return NULL;
342 }
9d4a0314 343 skb->priority = TC_PRIO_CONTROL;
57e1ab6e 344 igmp_skb_size(skb) = size;
1da177e4 345
31e4543d 346 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
78fbfd8a
DM		 347 0, 0,
348 IPPROTO_IGMP, 0, dev->ifindex);
349 if (IS_ERR(rt)) {
350 kfree_skb(skb);
351 return NULL;
1da177e4 352 }
1da177e4 353
d8d1f30b 354 skb_dst_set(skb, &rt->dst);
1da177e4
LT		 355 skb->dev = dev;
356
66088243 357 skb_reserve(skb, hlen);
1da177e4 358
7e28ecc2 359 skb_reset_network_header(skb);
eddc9ec5 360 pip = ip_hdr(skb);
7e28ecc2 361 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 362
363 pip->version = 4;
364 pip->ihl = (sizeof(struct iphdr)+4)>>2;
365 pip->tos = 0xc0;
366 pip->frag_off = htons(IP_DF);
367 pip->ttl = 1;
492f64ce
DM		 368 pip->daddr = fl4.daddr;
369 pip->saddr = fl4.saddr;
1da177e4
LT		 370 pip->protocol = IPPROTO_IGMP;
371 pip->tot_len = 0; /* filled in later */
703133de 372 ip_select_ident(skb, &rt->dst, NULL);
5e73ea1a
DB		 373 ((u8 *)&pip[1])[0] = IPOPT_RA;
374 ((u8 *)&pip[1])[1] = 4;
375 ((u8 *)&pip[1])[2] = 0;
376 ((u8 *)&pip[1])[3] = 0;
1da177e4 377
b0e380b1 378 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
d10ba34b 379 skb_put(skb, sizeof(*pig));
d9edf9e2 380 pig = igmpv3_report_hdr(skb);
1da177e4
LT		 381 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
382 pig->resv1 = 0;
383 pig->csum = 0;
384 pig->resv2 = 0;
385 pig->ngrec = 0;
386 return skb;
387}
388
389static int igmpv3_sendpack(struct sk_buff *skb)
390{
d9edf9e2 391 struct igmphdr *pig = igmp_hdr(skb);
f7c0c2ae 392 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
1da177e4 393
d9edf9e2 394 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
1da177e4 395
c439cb2e 396 return ip_local_out(skb);
1da177e4
LT		 397}
398
399static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
400{
a7e9ff73 401 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
1da177e4
LT		 402}
403
404static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
405 int type, struct igmpv3_grec **ppgr)
406{
407 struct net_device *dev = pmc->interface->dev;
408 struct igmpv3_report *pih;
409 struct igmpv3_grec *pgr;
410
411 if (!skb)
412 skb = igmpv3_newpack(dev, dev->mtu);
413 if (!skb)
414 return NULL;
415 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
416 pgr->grec_type = type;
417 pgr->grec_auxwords = 0;
418 pgr->grec_nsrcs = 0;
419 pgr->grec_mca = pmc->multiaddr;
d9edf9e2 420 pih = igmpv3_report_hdr(skb);
1da177e4
LT		 421 pih->ngrec = htons(ntohs(pih->ngrec)+1);
422 *ppgr = pgr;
423 return skb;
424}
425
57e1ab6e 426#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
1da177e4
LT		 427 skb_tailroom(skb)) : 0)
428
429static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
430 int type, int gdeleted, int sdeleted)
431{
432 struct net_device *dev = pmc->interface->dev;
433 struct igmpv3_report *pih;
434 struct igmpv3_grec *pgr = NULL;
435 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
ad12583f 436 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 437
438 if (pmc->multiaddr == IGMP_ALL_HOSTS)
439 return skb;
440
441 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
442 type == IGMPV3_MODE_IS_EXCLUDE;
443 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
444 type == IGMPV3_CHANGE_TO_EXCLUDE;
445
ad12583f
DS		 446 stotal = scount = 0;
447
1da177e4
LT		 448 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
449
ad12583f
DS		 450 if (!*psf_list)
451 goto empty_source;
452
d9edf9e2 453 pih = skb ? igmpv3_report_hdr(skb) : NULL;
1da177e4
LT		 454
455 /* EX and TO_EX get a fresh packet, if needed */
456 if (truncate) {
457 if (pih && pih->ngrec &&
458 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
459 if (skb)
460 igmpv3_sendpack(skb);
461 skb = igmpv3_newpack(dev, dev->mtu);
462 }
463 }
464 first = 1;
1da177e4 465 psf_prev = NULL;
c71151f0 466 for (psf = *psf_list; psf; psf = psf_next) {
ea4d9e72 467 __be32 *psrc;
1da177e4
LT		 468
469 psf_next = psf->sf_next;
470
471 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
472 psf_prev = psf;
473 continue;
474 }
475
476 /* clear marks on query responses */
477 if (isquery)
478 psf->sf_gsresp = 0;
479
63007727 480 if (AVAILABLE(skb) < sizeof(__be32) +
1da177e4
LT		 481 first*sizeof(struct igmpv3_grec)) {
482 if (truncate && !first)
483 break; /* truncate these */
484 if (pgr)
485 pgr->grec_nsrcs = htons(scount);
486 if (skb)
487 igmpv3_sendpack(skb);
488 skb = igmpv3_newpack(dev, dev->mtu);
489 first = 1;
490 scount = 0;
491 }
492 if (first) {
493 skb = add_grhead(skb, pmc, type, &pgr);
494 first = 0;
495 }
cc63f70b
AD		 496 if (!skb)
497 return NULL;
63007727 498 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
1da177e4 499 *psrc = psf->sf_inaddr;
ad12583f 500 scount++; stotal++;
1da177e4
LT		 501 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
502 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
503 psf->sf_crcount--;
504 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
505 if (psf_prev)
506 psf_prev->sf_next = psf->sf_next;
507 else
508 *psf_list = psf->sf_next;
509 kfree(psf);
510 continue;
511 }
512 }
513 psf_prev = psf;
514 }
ad12583f
DS		 515
516empty_source:
517 if (!stotal) {
518 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
519 type == IGMPV3_BLOCK_OLD_SOURCES)
520 return skb;
521 if (pmc->crcount || isquery) {
522 /* make sure we have room for group header */
c71151f0 523 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
ad12583f
DS		 524 igmpv3_sendpack(skb);
525 skb = NULL; /* add_grhead will get a new one */
526 }
527 skb = add_grhead(skb, pmc, type, &pgr);
528 }
529 }
1da177e4
LT		 530 if (pgr)
531 pgr->grec_nsrcs = htons(scount);
532
533 if (isquery)
534 pmc->gsquery = 0; /* clear query state on report */
535 return skb;
536}
537
538static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
539{
540 struct sk_buff *skb = NULL;
541 int type;
542
543 if (!pmc) {
1d7138de
ED		 544 rcu_read_lock();
545 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 546 if (pmc->multiaddr == IGMP_ALL_HOSTS)
547 continue;
548 spin_lock_bh(&pmc->lock);
549 if (pmc->sfcount[MCAST_EXCLUDE])
550 type = IGMPV3_MODE_IS_EXCLUDE;
551 else
552 type = IGMPV3_MODE_IS_INCLUDE;
553 skb = add_grec(skb, pmc, type, 0, 0);
554 spin_unlock_bh(&pmc->lock);
555 }
1d7138de 556 rcu_read_unlock();
1da177e4
LT		 557 } else {
558 spin_lock_bh(&pmc->lock);
559 if (pmc->sfcount[MCAST_EXCLUDE])
560 type = IGMPV3_MODE_IS_EXCLUDE;
561 else
562 type = IGMPV3_MODE_IS_INCLUDE;
563 skb = add_grec(skb, pmc, type, 0, 0);
564 spin_unlock_bh(&pmc->lock);
565 }
566 if (!skb)
567 return 0;
568 return igmpv3_sendpack(skb);
569}
570
571/*
572 * remove zero-count source records from a source filter list
573 */
574static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
575{
576 struct ip_sf_list *psf_prev, *psf_next, *psf;
577
578 psf_prev = NULL;
c71151f0 579 for (psf = *ppsf; psf; psf = psf_next) {
1da177e4
LT		 580 psf_next = psf->sf_next;
581 if (psf->sf_crcount == 0) {
582 if (psf_prev)
583 psf_prev->sf_next = psf->sf_next;
584 else
585 *ppsf = psf->sf_next;
586 kfree(psf);
587 } else
588 psf_prev = psf;
589 }
590}
591
592static void igmpv3_send_cr(struct in_device *in_dev)
593{
594 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
595 struct sk_buff *skb = NULL;
596 int type, dtype;
597
1d7138de 598 rcu_read_lock();
1da177e4
LT		 599 spin_lock_bh(&in_dev->mc_tomb_lock);
600
601 /* deleted MCA's */
602 pmc_prev = NULL;
c71151f0 603 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
1da177e4
LT		 604 pmc_next = pmc->next;
605 if (pmc->sfmode == MCAST_INCLUDE) {
606 type = IGMPV3_BLOCK_OLD_SOURCES;
607 dtype = IGMPV3_BLOCK_OLD_SOURCES;
608 skb = add_grec(skb, pmc, type, 1, 0);
609 skb = add_grec(skb, pmc, dtype, 1, 1);
610 }
611 if (pmc->crcount) {
1da177e4
LT		 612 if (pmc->sfmode == MCAST_EXCLUDE) {
613 type = IGMPV3_CHANGE_TO_INCLUDE;
614 skb = add_grec(skb, pmc, type, 1, 0);
615 }
ad12583f 616 pmc->crcount--;
1da177e4
LT		 617 if (pmc->crcount == 0) {
618 igmpv3_clear_zeros(&pmc->tomb);
619 igmpv3_clear_zeros(&pmc->sources);
620 }
621 }
622 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
623 if (pmc_prev)
624 pmc_prev->next = pmc_next;
625 else
626 in_dev->mc_tomb = pmc_next;
627 in_dev_put(pmc->interface);
628 kfree(pmc);
629 } else
630 pmc_prev = pmc;
631 }
632 spin_unlock_bh(&in_dev->mc_tomb_lock);
633
634 /* change recs */
1d7138de 635 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 636 spin_lock_bh(&pmc->lock);
637 if (pmc->sfcount[MCAST_EXCLUDE]) {
638 type = IGMPV3_BLOCK_OLD_SOURCES;
639 dtype = IGMPV3_ALLOW_NEW_SOURCES;
640 } else {
641 type = IGMPV3_ALLOW_NEW_SOURCES;
642 dtype = IGMPV3_BLOCK_OLD_SOURCES;
643 }
644 skb = add_grec(skb, pmc, type, 0, 0);
645 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
646
647 /* filter mode changes */
648 if (pmc->crcount) {
1da177e4
LT		 649 if (pmc->sfmode == MCAST_EXCLUDE)
650 type = IGMPV3_CHANGE_TO_EXCLUDE;
651 else
652 type = IGMPV3_CHANGE_TO_INCLUDE;
653 skb = add_grec(skb, pmc, type, 0, 0);
ad12583f 654 pmc->crcount--;
1da177e4
LT		 655 }
656 spin_unlock_bh(&pmc->lock);
657 }
1d7138de 658 rcu_read_unlock();
1da177e4
LT		 659
660 if (!skb)
661 return;
662 (void) igmpv3_sendpack(skb);
663}
664
665static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
666 int type)
667{
668 struct sk_buff *skb;
669 struct iphdr *iph;
670 struct igmphdr *ih;
671 struct rtable *rt;
672 struct net_device *dev = in_dev->dev;
877acedc 673 struct net *net = dev_net(dev);
63007727 674 __be32 group = pmc ? pmc->multiaddr : 0;
31e4543d 675 struct flowi4 fl4;
63007727 676 __be32 dst;
66088243 677 int hlen, tlen;
1da177e4
LT		 678
679 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
680 return igmpv3_send_report(in_dev, pmc);
681 else if (type == IGMP_HOST_LEAVE_MESSAGE)
682 dst = IGMP_ALL_ROUTER;
683 else
684 dst = group;
685
31e4543d 686 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
78fbfd8a
DM		 687 0, 0,
688 IPPROTO_IGMP, 0, dev->ifindex);
689 if (IS_ERR(rt))
690 return -1;
691
66088243
HX		 692 hlen = LL_RESERVED_SPACE(dev);
693 tlen = dev->needed_tailroom;
694 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
1da177e4
LT		 695 if (skb == NULL) {
696 ip_rt_put(rt);
697 return -1;
698 }
9d4a0314 699 skb->priority = TC_PRIO_CONTROL;
1da177e4 700
d8d1f30b 701 skb_dst_set(skb, &rt->dst);
1da177e4 702
66088243 703 skb_reserve(skb, hlen);
1da177e4 704
7e28ecc2 705 skb_reset_network_header(skb);
eddc9ec5 706 iph = ip_hdr(skb);
7e28ecc2 707 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 708
709 iph->version = 4;
710 iph->ihl = (sizeof(struct iphdr)+4)>>2;
711 iph->tos = 0xc0;
712 iph->frag_off = htons(IP_DF);
713 iph->ttl = 1;
714 iph->daddr = dst;
492f64ce 715 iph->saddr = fl4.saddr;
1da177e4 716 iph->protocol = IPPROTO_IGMP;
703133de 717 ip_select_ident(skb, &rt->dst, NULL);
5e73ea1a
DB		 718 ((u8 *)&iph[1])[0] = IPOPT_RA;
719 ((u8 *)&iph[1])[1] = 4;
720 ((u8 *)&iph[1])[2] = 0;
721 ((u8 *)&iph[1])[3] = 0;
1da177e4
LT		 722
723 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
a7e9ff73
JK		 724 ih->type = type;
725 ih->code = 0;
726 ih->csum = 0;
727 ih->group = group;
728 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
1da177e4 729
c439cb2e 730 return ip_local_out(skb);
1da177e4
LT		 731}
732
733static void igmp_gq_timer_expire(unsigned long data)
734{
735 struct in_device *in_dev = (struct in_device *)data;
736
737 in_dev->mr_gq_running = 0;
738 igmpv3_send_report(in_dev, NULL);
e2401654 739 in_dev_put(in_dev);
1da177e4
LT		 740}
741
742static void igmp_ifc_timer_expire(unsigned long data)
743{
744 struct in_device *in_dev = (struct in_device *)data;
745
746 igmpv3_send_cr(in_dev);
747 if (in_dev->mr_ifc_count) {
748 in_dev->mr_ifc_count--;
cab70040
WM		 749 igmp_ifc_start_timer(in_dev,
750 unsolicited_report_interval(in_dev));
1da177e4 751 }
e2401654 752 in_dev_put(in_dev);
1da177e4
LT		 753}
754
755static void igmp_ifc_event(struct in_device *in_dev)
756{
757 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
758 return;
e905a9ed 759 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 760 IGMP_Unsolicited_Report_Count;
761 igmp_ifc_start_timer(in_dev, 1);
762}
763
764
765static void igmp_timer_expire(unsigned long data)
766{
c71151f0 767 struct ip_mc_list *im = (struct ip_mc_list *)data;
1da177e4
LT		 768 struct in_device *in_dev = im->interface;
769
770 spin_lock(&im->lock);
a7e9ff73 771 im->tm_running = 0;
1da177e4
LT		 772
773 if (im->unsolicit_count) {
774 im->unsolicit_count--;
cab70040 775 igmp_start_timer(im, unsolicited_report_interval(in_dev));
1da177e4
LT		 776 }
777 im->reporter = 1;
778 spin_unlock(&im->lock);
779
780 if (IGMP_V1_SEEN(in_dev))
781 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
782 else if (IGMP_V2_SEEN(in_dev))
783 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
784 else
785 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
786
787 ip_ma_put(im);
788}
789
ad12583f 790/* mark EXCLUDE-mode sources */
ea4d9e72 791static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 792{
793 struct ip_sf_list *psf;
794 int i, scount;
795
ad12583f 796 scount = 0;
c71151f0 797 for (psf = pmc->sources; psf; psf = psf->sf_next) {
ad12583f
DS		 798 if (scount == nsrcs)
799 break;
c71151f0 800 for (i = 0; i < nsrcs; i++) {
ad12583f 801 /* skip inactive filters */
e05c4ad3 802 if (psf->sf_count[MCAST_INCLUDE] ||
ad12583f
DS		 803 pmc->sfcount[MCAST_EXCLUDE] !=
804 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 805 break;
ad12583f
DS		 806 if (srcs[i] == psf->sf_inaddr) {
807 scount++;
808 break;
809 }
810 }
811 }
812 pmc->gsquery = 0;
813 if (scount == nsrcs) /* all sources excluded */
814 return 0;
815 return 1;
816}
817
ea4d9e72 818static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 819{
820 struct ip_sf_list *psf;
821 int i, scount;
822
823 if (pmc->sfmode == MCAST_EXCLUDE)
824 return igmp_xmarksources(pmc, nsrcs, srcs);
825
826 /* mark INCLUDE-mode sources */
1da177e4 827 scount = 0;
c71151f0 828 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 829 if (scount == nsrcs)
830 break;
c71151f0 831 for (i = 0; i < nsrcs; i++)
1da177e4
LT		 832 if (srcs[i] == psf->sf_inaddr) {
833 psf->sf_gsresp = 1;
834 scount++;
835 break;
836 }
837 }
ad12583f
DS		 838 if (!scount) {
839 pmc->gsquery = 0;
840 return 0;
841 }
842 pmc->gsquery = 1;
843 return 1;
1da177e4
LT		 844}
845
d679c532
ED		 846/* return true if packet was dropped */
847static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 848{
849 struct ip_mc_list *im;
850
851 /* Timers are only set for non-local groups */
852
853 if (group == IGMP_ALL_HOSTS)
d679c532 854 return false;
1da177e4 855
1d7138de
ED		 856 rcu_read_lock();
857 for_each_pmc_rcu(in_dev, im) {
1da177e4
LT		 858 if (im->multiaddr == group) {
859 igmp_stop_timer(im);
860 break;
861 }
862 }
1d7138de 863 rcu_read_unlock();
d679c532 864 return false;
1da177e4
LT		 865}
866
d679c532
ED		 867/* return true if packet was dropped */
868static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
1da177e4
LT		 869 int len)
870{
d9edf9e2
ACM		 871 struct igmphdr *ih = igmp_hdr(skb);
872 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
1da177e4 873 struct ip_mc_list *im;
63007727 874 __be32 group = ih->group;
1da177e4
LT		 875 int max_delay;
876 int mark = 0;
877
878
5b7c8406 879 if (len == 8) {
1da177e4
LT		 880 if (ih->code == 0) {
881 /* Alas, old v1 router presents here. */
e905a9ed 882
1da177e4
LT		 883 max_delay = IGMP_Query_Response_Interval;
884 in_dev->mr_v1_seen = jiffies +
885 IGMP_V1_Router_Present_Timeout;
886 group = 0;
887 } else {
888 /* v2 router present */
889 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
890 in_dev->mr_v2_seen = jiffies +
891 IGMP_V2_Router_Present_Timeout;
892 }
893 /* cancel the interface change timer */
894 in_dev->mr_ifc_count = 0;
895 if (del_timer(&in_dev->mr_ifc_timer))
896 __in_dev_put(in_dev);
897 /* clear deleted report items */
898 igmpv3_clear_delrec(in_dev);
899 } else if (len < 12) {
d679c532 900 return true; /* ignore bogus packet; freed by caller */
5b7c8406
DS		 901 } else if (IGMP_V1_SEEN(in_dev)) {
902 /* This is a v3 query with v1 queriers present */
903 max_delay = IGMP_Query_Response_Interval;
904 group = 0;
905 } else if (IGMP_V2_SEEN(in_dev)) {
906 /* this is a v3 query with v2 queriers present;
907 * Interpretation of the max_delay code is problematic here.
908 * A real v2 host would use ih_code directly, while v3 has a
909 * different encoding. We use the v3 encoding as more likely
910 * to be intended in a v3 query.
911 */
912 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
a8c1f65c
BH		 913 if (!max_delay)
914 max_delay = 1; /* can't mod w/ 0 */
1da177e4
LT		 915 } else { /* v3 */
916 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
d679c532 917 return true;
e905a9ed 918
d9edf9e2 919 ih3 = igmpv3_query_hdr(skb);
1da177e4 920 if (ih3->nsrcs) {
e905a9ed 921 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 922 + ntohs(ih3->nsrcs)*sizeof(__be32)))
d679c532 923 return true;
d9edf9e2 924 ih3 = igmpv3_query_hdr(skb);
1da177e4
LT		 925 }
926
927 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
928 if (!max_delay)
929 max_delay = 1; /* can't mod w/ 0 */
930 in_dev->mr_maxdelay = max_delay;
931 if (ih3->qrv)
932 in_dev->mr_qrv = ih3->qrv;
933 if (!group) { /* general query */
934 if (ih3->nsrcs)
d679c532 935 return false; /* no sources allowed */
1da177e4 936 igmp_gq_start_timer(in_dev);
d679c532 937 return false;
1da177e4
LT		 938 }
939 /* mark sources to include, if group & source-specific */
940 mark = ih3->nsrcs != 0;
941 }
942
943 /*
944 * - Start the timers in all of our membership records
945 * that the query applies to for the interface on
946 * which the query arrived excl. those that belong
947 * to a "local" group (224.0.0.X)
948 * - For timers already running check if they need to
949 * be reset.
950 * - Use the igmp->igmp_code field as the maximum
951 * delay possible
952 */
1d7138de
ED		 953 rcu_read_lock();
954 for_each_pmc_rcu(in_dev, im) {
ad12583f
DS		 955 int changed;
956
1da177e4
LT		 957 if (group && group != im->multiaddr)
958 continue;
959 if (im->multiaddr == IGMP_ALL_HOSTS)
960 continue;
961 spin_lock_bh(&im->lock);
962 if (im->tm_running)
963 im->gsquery = im->gsquery && mark;
964 else
965 im->gsquery = mark;
ad12583f 966 changed = !im->gsquery ||
e905a9ed 967 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 968 spin_unlock_bh(&im->lock);
ad12583f
DS		 969 if (changed)
970 igmp_mod_timer(im, max_delay);
1da177e4 971 }
1d7138de 972 rcu_read_unlock();
d679c532 973 return false;
1da177e4
LT		 974}
975
9a57a9d2 976/* called in rcu_read_lock() section */
1da177e4
LT		 977int igmp_rcv(struct sk_buff *skb)
978{
979 /* This basically follows the spec line by line -- see RFC1112 */
980 struct igmphdr *ih;
9a57a9d2 981 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1da177e4 982 int len = skb->len;
d679c532 983 bool dropped = true;
1da177e4 984
cd557bc1
DL		 985 if (in_dev == NULL)
986 goto drop;
1da177e4 987
fb286bb2 988 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
9a57a9d2 989 goto drop;
fb286bb2
HX		 990
991 switch (skb->ip_summed) {
84fa7933 992 case CHECKSUM_COMPLETE:
d3bc23e7 993 if (!csum_fold(skb->csum))
fb286bb2
HX		 994 break;
995 /* fall through */
996 case CHECKSUM_NONE:
997 skb->csum = 0;
998 if (__skb_checksum_complete(skb))
9a57a9d2 999 goto drop;
1da177e4
LT		 1000 }
1001
d9edf9e2 1002 ih = igmp_hdr(skb);
1da177e4
LT		 1003 switch (ih->type) {
1004 case IGMP_HOST_MEMBERSHIP_QUERY:
d679c532 1005 dropped = igmp_heard_query(in_dev, skb, len);
1da177e4
LT		 1006 break;
1007 case IGMP_HOST_MEMBERSHIP_REPORT:
1008 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1da177e4 1009 /* Is it our report looped back? */
c7537967 1010 if (rt_is_output_route(skb_rtable(skb)))
1da177e4 1011 break;
24c69275
DS		 1012 /* don't rely on MC router hearing unicast reports */
1013 if (skb->pkt_type == PACKET_MULTICAST ||
1014 skb->pkt_type == PACKET_BROADCAST)
d679c532 1015 dropped = igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 1016 break;
1017 case IGMP_PIM:
1018#ifdef CONFIG_IP_PIMSM_V1
1da177e4
LT		 1019 return pim_rcv_v1(skb);
1020#endif
c6b471e6 1021 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1da177e4
LT		 1022 case IGMP_DVMRP:
1023 case IGMP_TRACE:
1024 case IGMP_HOST_LEAVE_MESSAGE:
1025 case IGMP_MTRACE:
1026 case IGMP_MTRACE_RESP:
1027 break;
1028 default:
dd1c1853 1029 break;
1da177e4 1030 }
fb286bb2 1031
cd557bc1 1032drop:
d679c532
ED		 1033 if (dropped)
1034 kfree_skb(skb);
1035 else
1036 consume_skb(skb);
1da177e4
LT		 1037 return 0;
1038}
1039
1040#endif
1041
1042
1043/*
1044 * Add a filter to a device
1045 */
1046
63007727 1047static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1048{
1049 char buf[MAX_ADDR_LEN];
1050 struct net_device *dev = in_dev->dev;
1051
1052 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1053 We will get multicast token leakage, when IFF_MULTICAST
b81693d9 1054 is changed. This check should be done in ndo_set_rx_mode
1da177e4
LT		 1055 routine. Something sort of:
1056 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1057 --ANK
1058 */
1059 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1060 dev_mc_add(dev, buf);
1da177e4
LT		 1061}
1062
1063/*
1064 * Remove a filter from a device
1065 */
1066
63007727 1067static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1068{
1069 char buf[MAX_ADDR_LEN];
1070 struct net_device *dev = in_dev->dev;
1071
1072 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1073 dev_mc_del(dev, buf);
1da177e4
LT		 1074}
1075
1076#ifdef CONFIG_IP_MULTICAST
1077/*
1078 * deleted ip_mc_list manipulation
1079 */
1080static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1081{
1082 struct ip_mc_list *pmc;
1083
1084 /* this is an "ip_mc_list" for convenience; only the fields below
1085 * are actually used. In particular, the refcnt and users are not
1086 * used for management of the delete list. Using the same structure
1087 * for deleted items allows change reports to use common code with
1088 * non-deleted or query-response MCA's.
1089 */
0da974f4 1090 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1091 if (!pmc)
1092 return;
1da177e4
LT		 1093 spin_lock_bh(&im->lock);
1094 pmc->interface = im->interface;
1095 in_dev_hold(in_dev);
1096 pmc->multiaddr = im->multiaddr;
1097 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1098 IGMP_Unsolicited_Report_Count;
1099 pmc->sfmode = im->sfmode;
1100 if (pmc->sfmode == MCAST_INCLUDE) {
1101 struct ip_sf_list *psf;
1102
1103 pmc->tomb = im->tomb;
1104 pmc->sources = im->sources;
1105 im->tomb = im->sources = NULL;
c71151f0 1106 for (psf = pmc->sources; psf; psf = psf->sf_next)
1da177e4
LT		 1107 psf->sf_crcount = pmc->crcount;
1108 }
1109 spin_unlock_bh(&im->lock);
1110
1111 spin_lock_bh(&in_dev->mc_tomb_lock);
1112 pmc->next = in_dev->mc_tomb;
1113 in_dev->mc_tomb = pmc;
1114 spin_unlock_bh(&in_dev->mc_tomb_lock);
1115}
1116
63007727 1117static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1118{
1119 struct ip_mc_list *pmc, *pmc_prev;
1120 struct ip_sf_list *psf, *psf_next;
1121
1122 spin_lock_bh(&in_dev->mc_tomb_lock);
1123 pmc_prev = NULL;
c71151f0 1124 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1da177e4
LT		 1125 if (pmc->multiaddr == multiaddr)
1126 break;
1127 pmc_prev = pmc;
1128 }
1129 if (pmc) {
1130 if (pmc_prev)
1131 pmc_prev->next = pmc->next;
1132 else
1133 in_dev->mc_tomb = pmc->next;
1134 }
1135 spin_unlock_bh(&in_dev->mc_tomb_lock);
1136 if (pmc) {
c71151f0 1137 for (psf = pmc->tomb; psf; psf = psf_next) {
1da177e4
LT		 1138 psf_next = psf->sf_next;
1139 kfree(psf);
1140 }
1141 in_dev_put(pmc->interface);
1142 kfree(pmc);
1143 }
1144}
1145
1146static void igmpv3_clear_delrec(struct in_device *in_dev)
1147{
1148 struct ip_mc_list *pmc, *nextpmc;
1149
1150 spin_lock_bh(&in_dev->mc_tomb_lock);
1151 pmc = in_dev->mc_tomb;
1152 in_dev->mc_tomb = NULL;
1153 spin_unlock_bh(&in_dev->mc_tomb_lock);
1154
1155 for (; pmc; pmc = nextpmc) {
1156 nextpmc = pmc->next;
1157 ip_mc_clear_src(pmc);
1158 in_dev_put(pmc->interface);
1159 kfree(pmc);
1160 }
1161 /* clear dead sources, too */
1d7138de
ED		 1162 rcu_read_lock();
1163 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1164 struct ip_sf_list *psf, *psf_next;
1165
1166 spin_lock_bh(&pmc->lock);
1167 psf = pmc->tomb;
1168 pmc->tomb = NULL;
1169 spin_unlock_bh(&pmc->lock);
c71151f0 1170 for (; psf; psf = psf_next) {
1da177e4
LT		 1171 psf_next = psf->sf_next;
1172 kfree(psf);
1173 }
1174 }
1d7138de 1175 rcu_read_unlock();
1da177e4
LT		 1176}
1177#endif
1178
1179static void igmp_group_dropped(struct ip_mc_list *im)
1180{
1181 struct in_device *in_dev = im->interface;
1182#ifdef CONFIG_IP_MULTICAST
1183 int reporter;
1184#endif
1185
1186 if (im->loaded) {
1187 im->loaded = 0;
1188 ip_mc_filter_del(in_dev, im->multiaddr);
1189 }
1190
1191#ifdef CONFIG_IP_MULTICAST
1192 if (im->multiaddr == IGMP_ALL_HOSTS)
1193 return;
1194
1195 reporter = im->reporter;
1196 igmp_stop_timer(im);
1197
1198 if (!in_dev->dead) {
1199 if (IGMP_V1_SEEN(in_dev))
24cf3af3 1200 return;
1da177e4
LT		 1201 if (IGMP_V2_SEEN(in_dev)) {
1202 if (reporter)
1203 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
24cf3af3 1204 return;
1da177e4
LT		 1205 }
1206 /* IGMPv3 */
1207 igmpv3_add_delrec(in_dev, im);
1208
1209 igmp_ifc_event(in_dev);
1210 }
1da177e4 1211#endif
1da177e4
LT		 1212}
1213
1214static void igmp_group_added(struct ip_mc_list *im)
1215{
1216 struct in_device *in_dev = im->interface;
1217
1218 if (im->loaded == 0) {
1219 im->loaded = 1;
1220 ip_mc_filter_add(in_dev, im->multiaddr);
1221 }
1222
1223#ifdef CONFIG_IP_MULTICAST
1224 if (im->multiaddr == IGMP_ALL_HOSTS)
1225 return;
1226
1227 if (in_dev->dead)
1228 return;
1229 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1230 spin_lock_bh(&im->lock);
1231 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1232 spin_unlock_bh(&im->lock);
1233 return;
1234 }
1235 /* else, v3 */
1236
1237 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1238 IGMP_Unsolicited_Report_Count;
1239 igmp_ifc_event(in_dev);
1240#endif
1241}
1242
1243
1244/*
1245 * Multicast list managers
1246 */
1247
e9897071
ED		 1248static u32 ip_mc_hash(const struct ip_mc_list *im)
1249{
c70eba74 1250 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
e9897071
ED		 1251}
1252
1253static void ip_mc_hash_add(struct in_device *in_dev,
1254 struct ip_mc_list *im)
1255{
1256 struct ip_mc_list __rcu **mc_hash;
1257 u32 hash;
1258
1259 mc_hash = rtnl_dereference(in_dev->mc_hash);
1260 if (mc_hash) {
1261 hash = ip_mc_hash(im);
c70eba74 1262 im->next_hash = mc_hash[hash];
e9897071
ED		 1263 rcu_assign_pointer(mc_hash[hash], im);
1264 return;
1265 }
1266
1267 /* do not use a hash table for small number of items */
1268 if (in_dev->mc_count < 4)
1269 return;
1270
1271 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1272 GFP_KERNEL);
1273 if (!mc_hash)
1274 return;
1275
1276 for_each_pmc_rtnl(in_dev, im) {
1277 hash = ip_mc_hash(im);
c70eba74 1278 im->next_hash = mc_hash[hash];
e9897071
ED		 1279 RCU_INIT_POINTER(mc_hash[hash], im);
1280 }
1281
1282 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1283}
1284
1285static void ip_mc_hash_remove(struct in_device *in_dev,
1286 struct ip_mc_list *im)
1287{
1288 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1289 struct ip_mc_list *aux;
1290
1291 if (!mc_hash)
1292 return;
1293 mc_hash += ip_mc_hash(im);
1294 while ((aux = rtnl_dereference(*mc_hash)) != im)
1295 mc_hash = &aux->next_hash;
1296 *mc_hash = im->next_hash;
1297}
1298
1da177e4
LT		 1299
1300/*
1301 * A socket has joined a multicast group on device dev.
1302 */
1303
8f935bbd 1304void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1305{
1306 struct ip_mc_list *im;
1307
1308 ASSERT_RTNL();
1309
1d7138de 1310 for_each_pmc_rtnl(in_dev, im) {
1da177e4
LT		 1311 if (im->multiaddr == addr) {
1312 im->users++;
1313 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1314 goto out;
1315 }
1316 }
1317
1d7138de 1318 im = kzalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1319 if (!im)
1320 goto out;
1321
a7e9ff73
JK		 1322 im->users = 1;
1323 im->interface = in_dev;
1da177e4 1324 in_dev_hold(in_dev);
a7e9ff73 1325 im->multiaddr = addr;
1da177e4
LT		 1326 /* initial mode is (EX, empty) */
1327 im->sfmode = MCAST_EXCLUDE;
1da177e4 1328 im->sfcount[MCAST_EXCLUDE] = 1;
1da177e4
LT		 1329 atomic_set(&im->refcnt, 1);
1330 spin_lock_init(&im->lock);
1331#ifdef CONFIG_IP_MULTICAST
b24b8a24 1332 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1da177e4 1333 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1da177e4 1334#endif
1d7138de
ED		 1335
1336 im->next_rcu = in_dev->mc_list;
b8bae41e 1337 in_dev->mc_count++;
cf778b00 1338 rcu_assign_pointer(in_dev->mc_list, im);
1d7138de 1339
e9897071
ED		 1340 ip_mc_hash_add(in_dev, im);
1341
1da177e4
LT		 1342#ifdef CONFIG_IP_MULTICAST
1343 igmpv3_del_delrec(in_dev, im->multiaddr);
1344#endif
1345 igmp_group_added(im);
1346 if (!in_dev->dead)
1347 ip_rt_multicast_event(in_dev);
1348out:
1349 return;
1350}
4bc2f18b 1351EXPORT_SYMBOL(ip_mc_inc_group);
1da177e4 1352
a816c7c7 1353/*
4aa5dee4 1354 * Resend IGMP JOIN report; used by netdev notifier.
a816c7c7 1355 */
4aa5dee4 1356static void ip_mc_rejoin_groups(struct in_device *in_dev)
a816c7c7 1357{
08882669 1358#ifdef CONFIG_IP_MULTICAST
866f3b25
ED		 1359 struct ip_mc_list *im;
1360 int type;
a816c7c7 1361
4aa5dee4
JP		 1362 ASSERT_RTNL();
1363
1364 for_each_pmc_rtnl(in_dev, im) {
866f3b25
ED		 1365 if (im->multiaddr == IGMP_ALL_HOSTS)
1366 continue;
a816c7c7 1367
866f3b25
ED		 1368 /* a failover is happening and switches
1369 * must be notified immediately
1370 */
1371 if (IGMP_V1_SEEN(in_dev))
1372 type = IGMP_HOST_MEMBERSHIP_REPORT;
1373 else if (IGMP_V2_SEEN(in_dev))
1374 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1375 else
1376 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1377 igmp_send_report(in_dev, im, type);
1378 }
a816c7c7
JV		 1379#endif
1380}
1381
1da177e4
LT		 1382/*
1383 * A socket has left a multicast group on device dev
1384 */
1385
8f935bbd 1386void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1da177e4 1387{
1d7138de
ED		 1388 struct ip_mc_list *i;
1389 struct ip_mc_list __rcu **ip;
e905a9ed 1390
1da177e4 1391 ASSERT_RTNL();
e905a9ed 1392
1d7138de
ED		 1393 for (ip = &in_dev->mc_list;
1394 (i = rtnl_dereference(*ip)) != NULL;
1395 ip = &i->next_rcu) {
a7e9ff73 1396 if (i->multiaddr == addr) {
1da177e4 1397 if (--i->users == 0) {
e9897071 1398 ip_mc_hash_remove(in_dev, i);
1d7138de 1399 *ip = i->next_rcu;
b8bae41e 1400 in_dev->mc_count--;
1da177e4 1401 igmp_group_dropped(i);
24cf3af3 1402 ip_mc_clear_src(i);
1da177e4
LT		 1403
1404 if (!in_dev->dead)
1405 ip_rt_multicast_event(in_dev);
1406
1407 ip_ma_put(i);
1408 return;
1409 }
1410 break;
1411 }
1412 }
1413}
4bc2f18b 1414EXPORT_SYMBOL(ip_mc_dec_group);
1da177e4 1415
75c78500
MS		 1416/* Device changing type */
1417
1418void ip_mc_unmap(struct in_device *in_dev)
1419{
1d7138de 1420 struct ip_mc_list *pmc;
75c78500
MS		 1421
1422 ASSERT_RTNL();
1423
1d7138de
ED		 1424 for_each_pmc_rtnl(in_dev, pmc)
1425 igmp_group_dropped(pmc);
75c78500
MS		 1426}
1427
1428void ip_mc_remap(struct in_device *in_dev)
1429{
1d7138de 1430 struct ip_mc_list *pmc;
75c78500
MS		 1431
1432 ASSERT_RTNL();
1433
1d7138de
ED		 1434 for_each_pmc_rtnl(in_dev, pmc)
1435 igmp_group_added(pmc);
75c78500
MS		 1436}
1437
1da177e4
LT		 1438/* Device going down */
1439
1440void ip_mc_down(struct in_device *in_dev)
1441{
1d7138de 1442 struct ip_mc_list *pmc;
1da177e4
LT		 1443
1444 ASSERT_RTNL();
1445
1d7138de
ED		 1446 for_each_pmc_rtnl(in_dev, pmc)
1447 igmp_group_dropped(pmc);
1da177e4
LT		 1448
1449#ifdef CONFIG_IP_MULTICAST
1450 in_dev->mr_ifc_count = 0;
1451 if (del_timer(&in_dev->mr_ifc_timer))
1452 __in_dev_put(in_dev);
1453 in_dev->mr_gq_running = 0;
1454 if (del_timer(&in_dev->mr_gq_timer))
1455 __in_dev_put(in_dev);
1456 igmpv3_clear_delrec(in_dev);
1457#endif
1458
1459 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1460}
1461
1462void ip_mc_init_dev(struct in_device *in_dev)
1463{
1464 ASSERT_RTNL();
1465
1da177e4 1466#ifdef CONFIG_IP_MULTICAST
b24b8a24
PE		 1467 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1468 (unsigned long)in_dev);
b24b8a24
PE		 1469 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1470 (unsigned long)in_dev);
1da177e4
LT		 1471 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1472#endif
1473
1da177e4
LT		 1474 spin_lock_init(&in_dev->mc_tomb_lock);
1475}
1476
1477/* Device going up */
1478
1479void ip_mc_up(struct in_device *in_dev)
1480{
1d7138de 1481 struct ip_mc_list *pmc;
1da177e4
LT		 1482
1483 ASSERT_RTNL();
1484
1485 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1486
1d7138de
ED		 1487 for_each_pmc_rtnl(in_dev, pmc)
1488 igmp_group_added(pmc);
1da177e4
LT		 1489}
1490
1491/*
1492 * Device is about to be destroyed: clean up.
1493 */
1494
1495void ip_mc_destroy_dev(struct in_device *in_dev)
1496{
1497 struct ip_mc_list *i;
1498
1499 ASSERT_RTNL();
1500
1501 /* Deactivate timers */
1502 ip_mc_down(in_dev);
1503
1d7138de
ED		 1504 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1505 in_dev->mc_list = i->next_rcu;
b8bae41e 1506 in_dev->mc_count--;
1d7138de 1507
24cf3af3
VF		 1508 /* We've dropped the groups in ip_mc_down already */
1509 ip_mc_clear_src(i);
1da177e4 1510 ip_ma_put(i);
1da177e4 1511 }
1da177e4
LT		 1512}
1513
9e917dca 1514/* RTNL is locked */
877acedc 1515static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1da177e4 1516{
1da177e4
LT		 1517 struct net_device *dev = NULL;
1518 struct in_device *idev = NULL;
1519
1520 if (imr->imr_ifindex) {
877acedc 1521 idev = inetdev_by_index(net, imr->imr_ifindex);
1da177e4
LT		 1522 return idev;
1523 }
1524 if (imr->imr_address.s_addr) {
9e917dca 1525 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1da177e4
LT		 1526 if (!dev)
1527 return NULL;
1da177e4
LT		 1528 }
1529
b23dd4fe 1530 if (!dev) {
78fbfd8a
DM		 1531 struct rtable *rt = ip_route_output(net,
1532 imr->imr_multiaddr.s_addr,
1533 0, 0, 0);
b23dd4fe
DM		 1534 if (!IS_ERR(rt)) {
1535 dev = rt->dst.dev;
1536 ip_rt_put(rt);
1537 }
1da177e4
LT		 1538 }
1539 if (dev) {
1540 imr->imr_ifindex = dev->ifindex;
e5ed6399 1541 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1542 }
1543 return idev;
1544}
1545
1546/*
1547 * Join a socket to a group
1548 */
ab32ea5d
BH		 1549int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1550int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1da177e4
LT		 1551
1552
1553static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1554 __be32 *psfsrc)
1da177e4
LT		 1555{
1556 struct ip_sf_list *psf, *psf_prev;
1557 int rv = 0;
1558
1559 psf_prev = NULL;
c71151f0 1560 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 1561 if (psf->sf_inaddr == *psfsrc)
1562 break;
1563 psf_prev = psf;
1564 }
1565 if (!psf || psf->sf_count[sfmode] == 0) {
1566 /* source filter not found, or count wrong => bug */
1567 return -ESRCH;
1568 }
1569 psf->sf_count[sfmode]--;
1570 if (psf->sf_count[sfmode] == 0) {
1571 ip_rt_multicast_event(pmc->interface);
1572 }
1573 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1574#ifdef CONFIG_IP_MULTICAST
1575 struct in_device *in_dev = pmc->interface;
1576#endif
1577
1578 /* no more filters for this source */
1579 if (psf_prev)
1580 psf_prev->sf_next = psf->sf_next;
1581 else
1582 pmc->sources = psf->sf_next;
1583#ifdef CONFIG_IP_MULTICAST
1584 if (psf->sf_oldin &&
1585 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
e905a9ed 1586 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1587 IGMP_Unsolicited_Report_Count;
1588 psf->sf_next = pmc->tomb;
1589 pmc->tomb = psf;
1590 rv = 1;
1591 } else
1592#endif
1593 kfree(psf);
1594 }
1595 return rv;
1596}
1597
1598#ifndef CONFIG_IP_MULTICAST
1599#define igmp_ifc_event(x) do { } while (0)
1600#endif
1601
8f935bbd
AV		 1602static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1603 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1604{
1605 struct ip_mc_list *pmc;
1606 int changerec = 0;
1607 int i, err;
1608
1609 if (!in_dev)
1610 return -ENODEV;
1d7138de
ED		 1611 rcu_read_lock();
1612 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1613 if (*pmca == pmc->multiaddr)
1614 break;
1615 }
1616 if (!pmc) {
1617 /* MCA not found?? bug */
1d7138de 1618 rcu_read_unlock();
1da177e4
LT		 1619 return -ESRCH;
1620 }
1621 spin_lock_bh(&pmc->lock);
1d7138de 1622 rcu_read_unlock();
1da177e4
LT		 1623#ifdef CONFIG_IP_MULTICAST
1624 sf_markstate(pmc);
1625#endif
1626 if (!delta) {
1627 err = -EINVAL;
1628 if (!pmc->sfcount[sfmode])
1629 goto out_unlock;
1630 pmc->sfcount[sfmode]--;
1631 }
1632 err = 0;
c71151f0 1633 for (i = 0; i < sfcount; i++) {
1da177e4
LT		 1634 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1635
1636 changerec |= rv > 0;
1637 if (!err && rv < 0)
1638 err = rv;
1639 }
1640 if (pmc->sfmode == MCAST_EXCLUDE &&
1641 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1642 pmc->sfcount[MCAST_INCLUDE]) {
1643#ifdef CONFIG_IP_MULTICAST
1644 struct ip_sf_list *psf;
1645#endif
1646
1647 /* filter mode change */
1648 pmc->sfmode = MCAST_INCLUDE;
1649#ifdef CONFIG_IP_MULTICAST
e905a9ed 1650 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1651 IGMP_Unsolicited_Report_Count;
1652 in_dev->mr_ifc_count = pmc->crcount;
c71151f0 1653 for (psf = pmc->sources; psf; psf = psf->sf_next)
1da177e4
LT		 1654 psf->sf_crcount = 0;
1655 igmp_ifc_event(pmc->interface);
1656 } else if (sf_setstate(pmc) || changerec) {
1657 igmp_ifc_event(pmc->interface);
1658#endif
1659 }
1660out_unlock:
1661 spin_unlock_bh(&pmc->lock);
1662 return err;
1663}
1664
1665/*
1666 * Add multicast single-source filter to the interface list
1667 */
1668static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
5eb81e89 1669 __be32 *psfsrc)
1da177e4
LT		 1670{
1671 struct ip_sf_list *psf, *psf_prev;
1672
1673 psf_prev = NULL;
c71151f0 1674 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 1675 if (psf->sf_inaddr == *psfsrc)
1676 break;
1677 psf_prev = psf;
1678 }
1679 if (!psf) {
0da974f4 1680 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1681 if (!psf)
1682 return -ENOBUFS;
1da177e4
LT		 1683 psf->sf_inaddr = *psfsrc;
1684 if (psf_prev) {
1685 psf_prev->sf_next = psf;
1686 } else
1687 pmc->sources = psf;
1688 }
1689 psf->sf_count[sfmode]++;
1690 if (psf->sf_count[sfmode] == 1) {
1691 ip_rt_multicast_event(pmc->interface);
1692 }
1693 return 0;
1694}
1695
1696#ifdef CONFIG_IP_MULTICAST
1697static void sf_markstate(struct ip_mc_list *pmc)
1698{
1699 struct ip_sf_list *psf;
1700 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1701
c71151f0 1702 for (psf = pmc->sources; psf; psf = psf->sf_next)
1da177e4
LT		 1703 if (pmc->sfcount[MCAST_EXCLUDE]) {
1704 psf->sf_oldin = mca_xcount ==
1705 psf->sf_count[MCAST_EXCLUDE] &&
1706 !psf->sf_count[MCAST_INCLUDE];
1707 } else
1708 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1709}
1710
1711static int sf_setstate(struct ip_mc_list *pmc)
1712{
ad12583f 1713 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1714 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1715 int qrv = pmc->interface->mr_qrv;
1716 int new_in, rv;
1717
1718 rv = 0;
c71151f0 1719 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 1720 if (pmc->sfcount[MCAST_EXCLUDE]) {
1721 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1722 !psf->sf_count[MCAST_INCLUDE];
1723 } else
1724 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1725 if (new_in) {
1726 if (!psf->sf_oldin) {
76edc605 1727 struct ip_sf_list *prev = NULL;
ad12583f 1728
c71151f0 1729 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
ad12583f
DS		 1730 if (dpsf->sf_inaddr == psf->sf_inaddr)
1731 break;
1732 prev = dpsf;
1733 }
1734 if (dpsf) {
1735 if (prev)
1736 prev->sf_next = dpsf->sf_next;
1737 else
1738 pmc->tomb = dpsf->sf_next;
1739 kfree(dpsf);
1740 }
1741 psf->sf_crcount = qrv;
1742 rv++;
1743 }
1744 } else if (psf->sf_oldin) {
1745
1746 psf->sf_crcount = 0;
1747 /*
1748 * add or update "delete" records if an active filter
1749 * is now inactive
1750 */
c71151f0 1751 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
ad12583f
DS		 1752 if (dpsf->sf_inaddr == psf->sf_inaddr)
1753 break;
1754 if (!dpsf) {
3ed37a6f 1755 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
ad12583f
DS		 1756 if (!dpsf)
1757 continue;
1758 *dpsf = *psf;
1759 /* pmc->lock held by callers */
1760 dpsf->sf_next = pmc->tomb;
1761 pmc->tomb = dpsf;
1762 }
1763 dpsf->sf_crcount = qrv;
1da177e4
LT		 1764 rv++;
1765 }
1766 }
1767 return rv;
1768}
1769#endif
1770
1771/*
1772 * Add multicast source filter list to the interface list
1773 */
8f935bbd
AV		 1774static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1775 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1776{
1777 struct ip_mc_list *pmc;
1778 int isexclude;
1779 int i, err;
1780
1781 if (!in_dev)
1782 return -ENODEV;
1d7138de
ED		 1783 rcu_read_lock();
1784 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1785 if (*pmca == pmc->multiaddr)
1786 break;
1787 }
1788 if (!pmc) {
1789 /* MCA not found?? bug */
1d7138de 1790 rcu_read_unlock();
1da177e4
LT		 1791 return -ESRCH;
1792 }
1793 spin_lock_bh(&pmc->lock);
1d7138de 1794 rcu_read_unlock();
1da177e4
LT		 1795
1796#ifdef CONFIG_IP_MULTICAST
1797 sf_markstate(pmc);
1798#endif
1799 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1800 if (!delta)
1801 pmc->sfcount[sfmode]++;
1802 err = 0;
c71151f0 1803 for (i = 0; i < sfcount; i++) {
5eb81e89 1804 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT		 1805 if (err)
1806 break;
1807 }
1808 if (err) {
1809 int j;
1810
685f94e6
JZ		 1811 if (!delta)
1812 pmc->sfcount[sfmode]--;
c71151f0 1813 for (j = 0; j < i; j++)
a1889c0d 1814 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4
LT		 1815 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1816#ifdef CONFIG_IP_MULTICAST
1da177e4 1817 struct ip_sf_list *psf;
cfcabdcc 1818 in_dev = pmc->interface;
1da177e4
LT		 1819#endif
1820
1821 /* filter mode change */
1822 if (pmc->sfcount[MCAST_EXCLUDE])
1823 pmc->sfmode = MCAST_EXCLUDE;
1824 else if (pmc->sfcount[MCAST_INCLUDE])
1825 pmc->sfmode = MCAST_INCLUDE;
1826#ifdef CONFIG_IP_MULTICAST
1827 /* else no filters; keep old mode for reports */
1828
e905a9ed 1829 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1830 IGMP_Unsolicited_Report_Count;
1831 in_dev->mr_ifc_count = pmc->crcount;
c71151f0 1832 for (psf = pmc->sources; psf; psf = psf->sf_next)
1da177e4
LT		 1833 psf->sf_crcount = 0;
1834 igmp_ifc_event(in_dev);
1835 } else if (sf_setstate(pmc)) {
1836 igmp_ifc_event(in_dev);
1837#endif
1838 }
1839 spin_unlock_bh(&pmc->lock);
1840 return err;
1841}
1842
1843static void ip_mc_clear_src(struct ip_mc_list *pmc)
1844{
1845 struct ip_sf_list *psf, *nextpsf;
1846
c71151f0 1847 for (psf = pmc->tomb; psf; psf = nextpsf) {
1da177e4
LT		 1848 nextpsf = psf->sf_next;
1849 kfree(psf);
1850 }
1851 pmc->tomb = NULL;
c71151f0 1852 for (psf = pmc->sources; psf; psf = nextpsf) {
1da177e4
LT		 1853 nextpsf = psf->sf_next;
1854 kfree(psf);
1855 }
1856 pmc->sources = NULL;
1857 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1858 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1859 pmc->sfcount[MCAST_EXCLUDE] = 1;
1860}
1861
1862
1863/*
1864 * Join a multicast group
1865 */
1866int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1867{
1868 int err;
8f935bbd 1869 __be32 addr = imr->imr_multiaddr.s_addr;
a7e9ff73 1870 struct ip_mc_socklist *iml = NULL, *i;
1da177e4
LT		 1871 struct in_device *in_dev;
1872 struct inet_sock *inet = inet_sk(sk);
877acedc 1873 struct net *net = sock_net(sk);
ca9b907d 1874 int ifindex;
1da177e4
LT		 1875 int count = 0;
1876
f97c1e0c 1877 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1878 return -EINVAL;
1879
6756ae4b 1880 rtnl_lock();
1da177e4 1881
877acedc 1882 in_dev = ip_mc_find_dev(net, imr);
1da177e4
LT		 1883
1884 if (!in_dev) {
1885 iml = NULL;
1886 err = -ENODEV;
1887 goto done;
1888 }
1889
1da177e4 1890 err = -EADDRINUSE;
ca9b907d 1891 ifindex = imr->imr_ifindex;
1d7138de 1892 for_each_pmc_rtnl(inet, i) {
ca9b907d
DS		 1893 if (i->multi.imr_multiaddr.s_addr == addr &&
1894 i->multi.imr_ifindex == ifindex)
1da177e4 1895 goto done;
1da177e4
LT		 1896 count++;
1897 }
1898 err = -ENOBUFS;
ca9b907d
DS		 1899 if (count >= sysctl_igmp_max_memberships)
1900 goto done;
a7e9ff73 1901 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
ca9b907d 1902 if (iml == NULL)
1da177e4 1903 goto done;
ca9b907d 1904
1da177e4 1905 memcpy(&iml->multi, imr, sizeof(*imr));
1d7138de 1906 iml->next_rcu = inet->mc_list;
1da177e4
LT		 1907 iml->sflist = NULL;
1908 iml->sfmode = MCAST_EXCLUDE;
cf778b00 1909 rcu_assign_pointer(inet->mc_list, iml);
1da177e4 1910 ip_mc_inc_group(in_dev, addr);
1da177e4 1911 err = 0;
1da177e4 1912done:
6756ae4b 1913 rtnl_unlock();
1da177e4
LT		 1914 return err;
1915}
4bc2f18b 1916EXPORT_SYMBOL(ip_mc_join_group);
1da177e4
LT		 1917
1918static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1919 struct in_device *in_dev)
1920{
1d7138de 1921 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1da177e4
LT		 1922 int err;
1923
c85bb41e 1924 if (psf == NULL) {
1da177e4
LT		 1925 /* any-source empty exclude case */
1926 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1927 iml->sfmode, 0, NULL, 0);
1928 }
1929 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
c85bb41e 1930 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
a9b3cd7f 1931 RCU_INIT_POINTER(iml->sflist, NULL);
c85bb41e
FL		 1932 /* decrease mem now to avoid the memleak warning */
1933 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
7519cce4 1934 kfree_rcu(psf, rcu);
1da177e4
LT		 1935 return err;
1936}
1937
1938/*
1939 * Ask a socket to leave a group.
1940 */
1941
1942int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1943{
1944 struct inet_sock *inet = inet_sk(sk);
1d7138de
ED		 1945 struct ip_mc_socklist *iml;
1946 struct ip_mc_socklist __rcu **imlp;
84b42bae 1947 struct in_device *in_dev;
877acedc 1948 struct net *net = sock_net(sk);
8f935bbd 1949 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1950 u32 ifindex;
acd6e00b 1951 int ret = -EADDRNOTAVAIL;
1da177e4
LT		 1952
1953 rtnl_lock();
877acedc 1954 in_dev = ip_mc_find_dev(net, imr);
84b42bae 1955 ifindex = imr->imr_ifindex;
1d7138de
ED		 1956 for (imlp = &inet->mc_list;
1957 (iml = rtnl_dereference(*imlp)) != NULL;
1958 imlp = &iml->next_rcu) {
acd6e00b
DS		 1959 if (iml->multi.imr_multiaddr.s_addr != group)
1960 continue;
1961 if (ifindex) {
1962 if (iml->multi.imr_ifindex != ifindex)
1963 continue;
1964 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1965 iml->multi.imr_address.s_addr)
1966 continue;
1da177e4 1967
acd6e00b 1968 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4 1969
1d7138de 1970 *imlp = iml->next_rcu;
acd6e00b
DS		 1971
1972 if (in_dev)
84b42bae 1973 ip_mc_dec_group(in_dev, group);
acd6e00b 1974 rtnl_unlock();
c85bb41e
FL		 1975 /* decrease mem now to avoid the memleak warning */
1976 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
10d50e74 1977 kfree_rcu(iml, rcu);
acd6e00b 1978 return 0;
1da177e4 1979 }
acd6e00b
DS		 1980 if (!in_dev)
1981 ret = -ENODEV;
1da177e4 1982 rtnl_unlock();
acd6e00b 1983 return ret;
1da177e4 1984}
193ba924 1985EXPORT_SYMBOL(ip_mc_leave_group);
1da177e4
LT		 1986
1987int ip_mc_source(int add, int omode, struct sock *sk, struct
1988 ip_mreq_source *mreqs, int ifindex)
1989{
1990 int err;
1991 struct ip_mreqn imr;
63007727 1992 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 1993 struct ip_mc_socklist *pmc;
1994 struct in_device *in_dev = NULL;
1995 struct inet_sock *inet = inet_sk(sk);
1996 struct ip_sf_socklist *psl;
877acedc 1997 struct net *net = sock_net(sk);
8cdaaa15 1998 int leavegroup = 0;
1da177e4
LT		 1999 int i, j, rv;
2000
f97c1e0c 2001 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2002 return -EINVAL;
2003
6756ae4b 2004 rtnl_lock();
1da177e4
LT		 2005
2006 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2007 imr.imr_address.s_addr = mreqs->imr_interface;
2008 imr.imr_ifindex = ifindex;
877acedc 2009 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2010
2011 if (!in_dev) {
2012 err = -ENODEV;
2013 goto done;
2014 }
2015 err = -EADDRNOTAVAIL;
2016
1d7138de 2017 for_each_pmc_rtnl(inet, pmc) {
f64f9e71
JP		 2018 if ((pmc->multi.imr_multiaddr.s_addr ==
2019 imr.imr_multiaddr.s_addr) &&
2020 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1da177e4
LT		 2021 break;
2022 }
917f2f10
DS		 2023 if (!pmc) { /* must have a prior join */
2024 err = -EINVAL;
1da177e4 2025 goto done;
917f2f10 2026 }
1da177e4
LT		 2027 /* if a source filter was set, must be the same mode as before */
2028 if (pmc->sflist) {
917f2f10
DS		 2029 if (pmc->sfmode != omode) {
2030 err = -EINVAL;
1da177e4 2031 goto done;
917f2f10 2032 }
1da177e4
LT		 2033 } else if (pmc->sfmode != omode) {
2034 /* allow mode switches for empty-set filters */
2035 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 2036 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 2037 NULL, 0);
2038 pmc->sfmode = omode;
2039 }
2040
1d7138de 2041 psl = rtnl_dereference(pmc->sflist);
1da177e4
LT		 2042 if (!add) {
2043 if (!psl)
917f2f10 2044 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 2045 rv = !0;
c71151f0 2046 for (i = 0; i < psl->sl_count; i++) {
1da177e4 2047 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 2048 sizeof(__be32));
1da177e4
LT		 2049 if (rv == 0)
2050 break;
2051 }
2052 if (rv) /* source not found */
917f2f10 2053 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 2054
8cdaaa15
DS		 2055 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2056 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2057 leavegroup = 1;
2058 goto done;
2059 }
2060
1da177e4 2061 /* update the interface filter */
e905a9ed 2062 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 2063 &mreqs->imr_sourceaddr, 1);
2064
c71151f0 2065 for (j = i+1; j < psl->sl_count; j++)
1da177e4
LT		 2066 psl->sl_addr[j-1] = psl->sl_addr[j];
2067 psl->sl_count--;
2068 err = 0;
2069 goto done;
2070 }
2071 /* else, add a new source to the filter */
2072
2073 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2074 err = -ENOBUFS;
2075 goto done;
2076 }
2077 if (!psl || psl->sl_count == psl->sl_max) {
2078 struct ip_sf_socklist *newpsl;
2079 int count = IP_SFBLOCK;
2080
2081 if (psl)
2082 count += psl->sl_max;
8b3a7005 2083 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 2084 if (!newpsl) {
2085 err = -ENOBUFS;
2086 goto done;
2087 }
2088 newpsl->sl_max = count;
2089 newpsl->sl_count = count - IP_SFBLOCK;
2090 if (psl) {
c71151f0 2091 for (i = 0; i < psl->sl_count; i++)
1da177e4 2092 newpsl->sl_addr[i] = psl->sl_addr[i];
c85bb41e
FL		 2093 /* decrease mem now to avoid the memleak warning */
2094 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
7519cce4 2095 kfree_rcu(psl, rcu);
1da177e4 2096 }
cf778b00 2097 rcu_assign_pointer(pmc->sflist, newpsl);
c85bb41e 2098 psl = newpsl;
1da177e4
LT		 2099 }
2100 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
c71151f0 2101 for (i = 0; i < psl->sl_count; i++) {
1da177e4 2102 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 2103 sizeof(__be32));
1da177e4
LT		 2104 if (rv == 0)
2105 break;
2106 }
2107 if (rv == 0) /* address already there is an error */
2108 goto done;
c71151f0 2109 for (j = psl->sl_count-1; j >= i; j--)
1da177e4
LT		 2110 psl->sl_addr[j+1] = psl->sl_addr[j];
2111 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2112 psl->sl_count++;
2113 err = 0;
2114 /* update the interface list */
e905a9ed 2115 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 2116 &mreqs->imr_sourceaddr, 1);
2117done:
6756ae4b 2118 rtnl_unlock();
8cdaaa15
DS		 2119 if (leavegroup)
2120 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2121 return err;
2122}
2123
2124int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2125{
9951f036 2126 int err = 0;
1da177e4 2127 struct ip_mreqn imr;
63007727 2128 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2129 struct ip_mc_socklist *pmc;
2130 struct in_device *in_dev;
2131 struct inet_sock *inet = inet_sk(sk);
2132 struct ip_sf_socklist *newpsl, *psl;
877acedc 2133 struct net *net = sock_net(sk);
9951f036 2134 int leavegroup = 0;
1da177e4 2135
f97c1e0c 2136 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2137 return -EINVAL;
2138 if (msf->imsf_fmode != MCAST_INCLUDE &&
2139 msf->imsf_fmode != MCAST_EXCLUDE)
2140 return -EINVAL;
2141
6756ae4b 2142 rtnl_lock();
1da177e4
LT		 2143
2144 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2145 imr.imr_address.s_addr = msf->imsf_interface;
2146 imr.imr_ifindex = ifindex;
877acedc 2147 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2148
2149 if (!in_dev) {
2150 err = -ENODEV;
2151 goto done;
2152 }
1da177e4 2153
9951f036
DS		 2154 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2155 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2156 leavegroup = 1;
2157 goto done;
2158 }
2159
1d7138de 2160 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2161 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2162 pmc->multi.imr_ifindex == imr.imr_ifindex)
2163 break;
2164 }
917f2f10
DS		 2165 if (!pmc) { /* must have a prior join */
2166 err = -EINVAL;
1da177e4 2167 goto done;
917f2f10 2168 }
1da177e4 2169 if (msf->imsf_numsrc) {
8b3a7005
KK		 2170 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2171 GFP_KERNEL);
1da177e4
LT		 2172 if (!newpsl) {
2173 err = -ENOBUFS;
2174 goto done;
2175 }
2176 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2177 memcpy(newpsl->sl_addr, msf->imsf_slist,
2178 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2179 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2180 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2181 if (err) {
2182 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2183 goto done;
2184 }
8713dbf0 2185 } else {
1da177e4 2186 newpsl = NULL;
8713dbf0
YZ		 2187 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2188 msf->imsf_fmode, 0, NULL, 0);
2189 }
1d7138de 2190 psl = rtnl_dereference(pmc->sflist);
1da177e4
LT		 2191 if (psl) {
2192 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2193 psl->sl_count, psl->sl_addr, 0);
c85bb41e
FL		 2194 /* decrease mem now to avoid the memleak warning */
2195 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
7519cce4 2196 kfree_rcu(psl, rcu);
1da177e4
LT		 2197 } else
2198 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2199 0, NULL, 0);
cf778b00 2200 rcu_assign_pointer(pmc->sflist, newpsl);
1da177e4 2201 pmc->sfmode = msf->imsf_fmode;
917f2f10 2202 err = 0;
1da177e4 2203done:
6756ae4b 2204 rtnl_unlock();
9951f036
DS		 2205 if (leavegroup)
2206 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2207 return err;
2208}
2209
2210int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2211 struct ip_msfilter __user *optval, int __user *optlen)
2212{
2213 int err, len, count, copycount;
2214 struct ip_mreqn imr;
63007727 2215 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2216 struct ip_mc_socklist *pmc;
2217 struct in_device *in_dev;
2218 struct inet_sock *inet = inet_sk(sk);
2219 struct ip_sf_socklist *psl;
877acedc 2220 struct net *net = sock_net(sk);
1da177e4 2221
f97c1e0c 2222 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2223 return -EINVAL;
2224
6756ae4b 2225 rtnl_lock();
1da177e4
LT		 2226
2227 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2228 imr.imr_address.s_addr = msf->imsf_interface;
2229 imr.imr_ifindex = 0;
877acedc 2230 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2231
2232 if (!in_dev) {
2233 err = -ENODEV;
2234 goto done;
2235 }
2236 err = -EADDRNOTAVAIL;
2237
1d7138de 2238 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2239 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2240 pmc->multi.imr_ifindex == imr.imr_ifindex)
2241 break;
2242 }
2243 if (!pmc) /* must have a prior join */
2244 goto done;
2245 msf->imsf_fmode = pmc->sfmode;
1d7138de 2246 psl = rtnl_dereference(pmc->sflist);
6756ae4b 2247 rtnl_unlock();
1da177e4
LT		 2248 if (!psl) {
2249 len = 0;
2250 count = 0;
2251 } else {
2252 count = psl->sl_count;
2253 }
2254 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2255 len = copycount * sizeof(psl->sl_addr[0]);
2256 msf->imsf_numsrc = count;
2257 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2258 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2259 return -EFAULT;
2260 }
2261 if (len &&
2262 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2263 return -EFAULT;
2264 return 0;
2265done:
6756ae4b 2266 rtnl_unlock();
1da177e4
LT		 2267 return err;
2268}
2269
2270int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2271 struct group_filter __user *optval, int __user *optlen)
2272{
2273 int err, i, count, copycount;
2274 struct sockaddr_in *psin;
63007727 2275 __be32 addr;
1da177e4
LT		 2276 struct ip_mc_socklist *pmc;
2277 struct inet_sock *inet = inet_sk(sk);
2278 struct ip_sf_socklist *psl;
2279
2280 psin = (struct sockaddr_in *)&gsf->gf_group;
2281 if (psin->sin_family != AF_INET)
2282 return -EINVAL;
2283 addr = psin->sin_addr.s_addr;
f97c1e0c 2284 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2285 return -EINVAL;
2286
6756ae4b 2287 rtnl_lock();
1da177e4
LT		 2288
2289 err = -EADDRNOTAVAIL;
2290
1d7138de 2291 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2292 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2293 pmc->multi.imr_ifindex == gsf->gf_interface)
2294 break;
2295 }
2296 if (!pmc) /* must have a prior join */
2297 goto done;
2298 gsf->gf_fmode = pmc->sfmode;
1d7138de 2299 psl = rtnl_dereference(pmc->sflist);
6756ae4b 2300 rtnl_unlock();
1da177e4
LT		 2301 count = psl ? psl->sl_count : 0;
2302 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2303 gsf->gf_numsrc = count;
2304 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2305 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2306 return -EFAULT;
2307 }
c71151f0 2308 for (i = 0; i < copycount; i++) {
1da177e4
LT		 2309 struct sockaddr_storage ss;
2310
2311 psin = (struct sockaddr_in *)&ss;
2312 memset(&ss, 0, sizeof(ss));
2313 psin->sin_family = AF_INET;
2314 psin->sin_addr.s_addr = psl->sl_addr[i];
2315 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2316 return -EFAULT;
2317 }
2318 return 0;
2319done:
6756ae4b 2320 rtnl_unlock();
1da177e4
LT		 2321 return err;
2322}
2323
2324/*
2325 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2326 */
c0cda068 2327int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2328{
2329 struct inet_sock *inet = inet_sk(sk);
2330 struct ip_mc_socklist *pmc;
2331 struct ip_sf_socklist *psl;
2332 int i;
c85bb41e 2333 int ret;
1da177e4 2334
c85bb41e 2335 ret = 1;
f97c1e0c 2336 if (!ipv4_is_multicast(loc_addr))
c85bb41e 2337 goto out;
1da177e4 2338
c85bb41e 2339 rcu_read_lock();
1d7138de 2340 for_each_pmc_rcu(inet, pmc) {
1da177e4
LT		 2341 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2342 pmc->multi.imr_ifindex == dif)
2343 break;
2344 }
c85bb41e 2345 ret = inet->mc_all;
1da177e4 2346 if (!pmc)
c85bb41e 2347 goto unlock;
1d7138de 2348 psl = rcu_dereference(pmc->sflist);
c85bb41e 2349 ret = (pmc->sfmode == MCAST_EXCLUDE);
1da177e4 2350 if (!psl)
c85bb41e 2351 goto unlock;
1da177e4 2352
c71151f0 2353 for (i = 0; i < psl->sl_count; i++) {
1da177e4
LT		 2354 if (psl->sl_addr[i] == rmt_addr)
2355 break;
2356 }
c85bb41e 2357 ret = 0;
1da177e4 2358 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
c85bb41e 2359 goto unlock;
1da177e4 2360 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
c85bb41e
FL		 2361 goto unlock;
2362 ret = 1;
2363unlock:
2364 rcu_read_unlock();
2365out:
2366 return ret;
1da177e4
LT		 2367}
2368
2369/*
2370 * A socket is closing.
2371 */
2372
2373void ip_mc_drop_socket(struct sock *sk)
2374{
2375 struct inet_sock *inet = inet_sk(sk);
2376 struct ip_mc_socklist *iml;
877acedc 2377 struct net *net = sock_net(sk);
1da177e4
LT		 2378
2379 if (inet->mc_list == NULL)
2380 return;
2381
2382 rtnl_lock();
1d7138de 2383 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
1da177e4 2384 struct in_device *in_dev;
1da177e4 2385
1d7138de 2386 inet->mc_list = iml->next_rcu;
877acedc 2387 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
bb699cbc 2388 (void) ip_mc_leave_src(sk, iml, in_dev);
18943d29 2389 if (in_dev != NULL)
1da177e4 2390 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
c85bb41e
FL		 2391 /* decrease mem now to avoid the memleak warning */
2392 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
10d50e74 2393 kfree_rcu(iml, rcu);
1da177e4
LT		 2394 }
2395 rtnl_unlock();
2396}
2397
dbdd9a52
DM		 2398/* called with rcu_read_lock() */
2399int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2400{
2401 struct ip_mc_list *im;
e9897071 2402 struct ip_mc_list __rcu **mc_hash;
1da177e4
LT		 2403 struct ip_sf_list *psf;
2404 int rv = 0;
2405
e9897071
ED		 2406 mc_hash = rcu_dereference(in_dev->mc_hash);
2407 if (mc_hash) {
c70eba74 2408 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
e9897071
ED		 2409
2410 for (im = rcu_dereference(mc_hash[hash]);
2411 im != NULL;
2412 im = rcu_dereference(im->next_hash)) {
2413 if (im->multiaddr == mc_addr)
2414 break;
2415 }
2416 } else {
2417 for_each_pmc_rcu(in_dev, im) {
2418 if (im->multiaddr == mc_addr)
2419 break;
2420 }
1da177e4
LT		 2421 }
2422 if (im && proto == IPPROTO_IGMP) {
2423 rv = 1;
2424 } else if (im) {
2425 if (src_addr) {
c71151f0 2426 for (psf = im->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 2427 if (psf->sf_inaddr == src_addr)
2428 break;
2429 }
2430 if (psf)
2431 rv = psf->sf_count[MCAST_INCLUDE] ||
2432 psf->sf_count[MCAST_EXCLUDE] !=
2433 im->sfcount[MCAST_EXCLUDE];
2434 else
2435 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2436 } else
2437 rv = 1; /* unspecified source; tentatively allow */
2438 }
1da177e4
LT		 2439 return rv;
2440}
2441
2442#if defined(CONFIG_PROC_FS)
2443struct igmp_mc_iter_state {
7091e728 2444 struct seq_net_private p;
1da177e4
LT		 2445 struct net_device *dev;
2446 struct in_device *in_dev;
2447};
2448
2449#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2450
2451static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2452{
7091e728 2453 struct net *net = seq_file_net(seq);
1da177e4
LT		 2454 struct ip_mc_list *im = NULL;
2455 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2456
7562f876 2457 state->in_dev = NULL;
61fbab77 2458 for_each_netdev_rcu(net, state->dev) {
1da177e4 2459 struct in_device *in_dev;
6baff150
ED		 2460
2461 in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2462 if (!in_dev)
2463 continue;
1d7138de 2464 im = rcu_dereference(in_dev->mc_list);
1da177e4
LT		 2465 if (im) {
2466 state->in_dev = in_dev;
2467 break;
2468 }
1da177e4
LT		 2469 }
2470 return im;
2471}
2472
2473static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2474{
2475 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
6baff150 2476
1d7138de
ED		 2477 im = rcu_dereference(im->next_rcu);
2478 while (!im) {
6baff150 2479 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2480 if (!state->dev) {
2481 state->in_dev = NULL;
2482 break;
2483 }
6baff150 2484 state->in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2485 if (!state->in_dev)
2486 continue;
1d7138de 2487 im = rcu_dereference(state->in_dev->mc_list);
1da177e4
LT		 2488 }
2489 return im;
2490}
2491
2492static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2493{
2494 struct ip_mc_list *im = igmp_mc_get_first(seq);
2495 if (im)
2496 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2497 --pos;
2498 return pos ? NULL : im;
2499}
2500
2501static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2502 __acquires(rcu)
1da177e4 2503{
61fbab77 2504 rcu_read_lock();
1da177e4
LT		 2505 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2506}
2507
2508static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2509{
2510 struct ip_mc_list *im;
2511 if (v == SEQ_START_TOKEN)
2512 im = igmp_mc_get_first(seq);
2513 else
2514 im = igmp_mc_get_next(seq, v);
2515 ++*pos;
2516 return im;
2517}
2518
2519static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
61fbab77 2520 __releases(rcu)
1da177e4
LT		 2521{
2522 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
1d7138de
ED		 2523
2524 state->in_dev = NULL;
1da177e4 2525 state->dev = NULL;
61fbab77 2526 rcu_read_unlock();
1da177e4
LT		 2527}
2528
2529static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2530{
2531 if (v == SEQ_START_TOKEN)
e905a9ed 2532 seq_puts(seq,
1da177e4
LT		 2533 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2534 else {
2535 struct ip_mc_list *im = (struct ip_mc_list *)v;
2536 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2537 char *querier;
a399a805
ED		 2538 long delta;
2539
1da177e4
LT		 2540#ifdef CONFIG_IP_MULTICAST
2541 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2542 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2543 "V3";
2544#else
2545 querier = "NONE";
2546#endif
2547
1d7138de 2548 if (rcu_dereference(state->in_dev->mc_list) == im) {
1da177e4 2549 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
b8bae41e 2550 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
1da177e4
LT		 2551 }
2552
a399a805 2553 delta = im->timer.expires - jiffies;
1da177e4 2554 seq_printf(seq,
338fcf98 2555 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4 2556 im->multiaddr, im->users,
a399a805
ED		 2557 im->tm_running,
2558 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
1da177e4
LT		 2559 im->reporter);
2560 }
2561 return 0;
2562}
2563
f690808e 2564static const struct seq_operations igmp_mc_seq_ops = {
1da177e4
LT		 2565 .start = igmp_mc_seq_start,
2566 .next = igmp_mc_seq_next,
2567 .stop = igmp_mc_seq_stop,
2568 .show = igmp_mc_seq_show,
2569};
2570
2571static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2572{
7091e728 2573 return seq_open_net(inode, file, &igmp_mc_seq_ops,
cf7732e4 2574 sizeof(struct igmp_mc_iter_state));
1da177e4
LT		 2575}
2576
9a32144e 2577static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2578 .owner = THIS_MODULE,
2579 .open = igmp_mc_seq_open,
2580 .read = seq_read,
2581 .llseek = seq_lseek,
7091e728 2582 .release = seq_release_net,
1da177e4
LT		 2583};
2584
2585struct igmp_mcf_iter_state {
7091e728 2586 struct seq_net_private p;
1da177e4
LT		 2587 struct net_device *dev;
2588 struct in_device *idev;
2589 struct ip_mc_list *im;
2590};
2591
2592#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2593
2594static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2595{
7091e728 2596 struct net *net = seq_file_net(seq);
1da177e4
LT		 2597 struct ip_sf_list *psf = NULL;
2598 struct ip_mc_list *im = NULL;
2599 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2600
7562f876
PE		 2601 state->idev = NULL;
2602 state->im = NULL;
61fbab77 2603 for_each_netdev_rcu(net, state->dev) {
1da177e4 2604 struct in_device *idev;
6baff150 2605 idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2606 if (unlikely(idev == NULL))
2607 continue;
1d7138de 2608 im = rcu_dereference(idev->mc_list);
1da177e4
LT		 2609 if (likely(im != NULL)) {
2610 spin_lock_bh(&im->lock);
2611 psf = im->sources;
2612 if (likely(psf != NULL)) {
2613 state->im = im;
2614 state->idev = idev;
2615 break;
2616 }
2617 spin_unlock_bh(&im->lock);
2618 }
1da177e4
LT		 2619 }
2620 return psf;
2621}
2622
2623static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2624{
2625 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2626
2627 psf = psf->sf_next;
2628 while (!psf) {
2629 spin_unlock_bh(&state->im->lock);
2630 state->im = state->im->next;
2631 while (!state->im) {
6baff150 2632 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2633 if (!state->dev) {
2634 state->idev = NULL;
2635 goto out;
2636 }
6baff150 2637 state->idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2638 if (!state->idev)
2639 continue;
1d7138de 2640 state->im = rcu_dereference(state->idev->mc_list);
1da177e4
LT		 2641 }
2642 if (!state->im)
2643 break;
2644 spin_lock_bh(&state->im->lock);
2645 psf = state->im->sources;
2646 }
2647out:
2648 return psf;
2649}
2650
2651static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2652{
2653 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2654 if (psf)
2655 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2656 --pos;
2657 return pos ? NULL : psf;
2658}
2659
2660static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2661 __acquires(rcu)
1da177e4 2662{
61fbab77 2663 rcu_read_lock();
1da177e4
LT		 2664 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2665}
2666
2667static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2668{
2669 struct ip_sf_list *psf;
2670 if (v == SEQ_START_TOKEN)
2671 psf = igmp_mcf_get_first(seq);
2672 else
2673 psf = igmp_mcf_get_next(seq, v);
2674 ++*pos;
2675 return psf;
2676}
2677
2678static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
61fbab77 2679 __releases(rcu)
1da177e4
LT		 2680{
2681 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2682 if (likely(state->im != NULL)) {
2683 spin_unlock_bh(&state->im->lock);
2684 state->im = NULL;
2685 }
1d7138de 2686 state->idev = NULL;
1da177e4 2687 state->dev = NULL;
61fbab77 2688 rcu_read_unlock();
1da177e4
LT		 2689}
2690
2691static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2692{
2693 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2694 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2695
2696 if (v == SEQ_START_TOKEN) {
e905a9ed 2697 seq_printf(seq,
1da177e4
LT		 2698 "%3s %6s "
2699 "%10s %10s %6s %6s\n", "Idx",
2700 "Device", "MCA",
2701 "SRC", "INC", "EXC");
2702 } else {
2703 seq_printf(seq,
2704 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2705 "0x%08x %6lu %6lu\n",
2706 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2707 ntohl(state->im->multiaddr),
2708 ntohl(psf->sf_inaddr),
2709 psf->sf_count[MCAST_INCLUDE],
2710 psf->sf_count[MCAST_EXCLUDE]);
2711 }
2712 return 0;
2713}
2714
f690808e 2715static const struct seq_operations igmp_mcf_seq_ops = {
1da177e4
LT		 2716 .start = igmp_mcf_seq_start,
2717 .next = igmp_mcf_seq_next,
2718 .stop = igmp_mcf_seq_stop,
2719 .show = igmp_mcf_seq_show,
2720};
2721
2722static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2723{
7091e728 2724 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
cf7732e4 2725 sizeof(struct igmp_mcf_iter_state));
1da177e4
LT		 2726}
2727
9a32144e 2728static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2729 .owner = THIS_MODULE,
2730 .open = igmp_mcf_seq_open,
2731 .read = seq_read,
2732 .llseek = seq_lseek,
7091e728 2733 .release = seq_release_net,
1da177e4
LT		 2734};
2735
2c8c1e72 2736static int __net_init igmp_net_init(struct net *net)
1da177e4 2737{
7091e728
AD		 2738 struct proc_dir_entry *pde;
2739
d4beaa66 2740 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
7091e728
AD		 2741 if (!pde)
2742 goto out_igmp;
d4beaa66
G		 2743 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2744 &igmp_mcf_seq_fops);
7091e728
AD		 2745 if (!pde)
2746 goto out_mcfilter;
1da177e4 2747 return 0;
7091e728
AD		 2748
2749out_mcfilter:
ece31ffd 2750 remove_proc_entry("igmp", net->proc_net);
7091e728
AD		 2751out_igmp:
2752 return -ENOMEM;
2753}
2754
2c8c1e72 2755static void __net_exit igmp_net_exit(struct net *net)
7091e728 2756{
ece31ffd
G		 2757 remove_proc_entry("mcfilter", net->proc_net);
2758 remove_proc_entry("igmp", net->proc_net);
7091e728
AD		 2759}
2760
2761static struct pernet_operations igmp_net_ops = {
2762 .init = igmp_net_init,
2763 .exit = igmp_net_exit,
2764};
2765
4aa5dee4
JP		 2766static int igmp_netdev_event(struct notifier_block *this,
2767 unsigned long event, void *ptr)
2768{
2769 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2770 struct in_device *in_dev;
2771
2772 switch (event) {
2773 case NETDEV_RESEND_IGMP:
2774 in_dev = __in_dev_get_rtnl(dev);
2775 if (in_dev)
2776 ip_mc_rejoin_groups(in_dev);
2777 break;
2778 default:
2779 break;
2780 }
2781 return NOTIFY_DONE;
2782}
2783
2784static struct notifier_block igmp_notifier = {
2785 .notifier_call = igmp_netdev_event,
2786};
2787
7091e728
AD		 2788int __init igmp_mc_proc_init(void)
2789{
4aa5dee4
JP		 2790 int err;
2791
2792 err = register_pernet_subsys(&igmp_net_ops);
2793 if (err)
2794 return err;
2795 err = register_netdevice_notifier(&igmp_notifier);
2796 if (err)
2797 goto reg_notif_fail;
2798 return 0;
2799
2800reg_notif_fail:
2801 unregister_pernet_subsys(&igmp_net_ops);
2802 return err;
1da177e4
LT		 2803}
2804#endif
Linux kernel - Deliverables
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