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ipv4,ipv6: grab rtnl before locking the socket
[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>
93a714d6 100#include <net/inet_common.h>
1da177e4
LT		 101#include <linux/netfilter_ipv4.h>
102#ifdef CONFIG_IP_MROUTE
103#include <linux/mroute.h>
104#endif
105#ifdef CONFIG_PROC_FS
106#include <linux/proc_fs.h>
107#include <linux/seq_file.h>
108#endif
109
110#define IP_MAX_MEMBERSHIPS 20
111#define IP_MAX_MSF 10
112
113#ifdef CONFIG_IP_MULTICAST
114/* Parameter names and values are taken from igmp-v2-06 draft */
115
436f7c20
FF		 116#define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
117#define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
118#define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
119#define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
120#define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
121#define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
1da177e4
LT		 122
123
436f7c20 124#define IGMP_INITIAL_REPORT_DELAY (1)
1da177e4 125
436f7c20 126/* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
1da177e4
LT		 127 * IGMP specs require to report membership immediately after
128 * joining a group, but we delay the first report by a
129 * small interval. It seems more natural and still does not
130 * contradict to specs provided this delay is small enough.
131 */
132
42f811b8 133#define IGMP_V1_SEEN(in_dev) \
c346dca1 134 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
42f811b8
HX		 135 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
136 ((in_dev)->mr_v1_seen && \
137 time_before(jiffies, (in_dev)->mr_v1_seen)))
138#define IGMP_V2_SEEN(in_dev) \
c346dca1 139 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
42f811b8
HX		 140 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
141 ((in_dev)->mr_v2_seen && \
142 time_before(jiffies, (in_dev)->mr_v2_seen)))
1da177e4 143
cab70040
WM		 144static int unsolicited_report_interval(struct in_device *in_dev)
145{
2690048c
WM		 146 int interval_ms, interval_jiffies;
147
cab70040 148 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
2690048c
WM		 149 interval_ms = IN_DEV_CONF_GET(
150 in_dev,
151 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
cab70040 152 else /* v3 */
2690048c
WM		 153 interval_ms = IN_DEV_CONF_GET(
154 in_dev,
155 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
156
157 interval_jiffies = msecs_to_jiffies(interval_ms);
158
159 /* _timer functions can't handle a delay of 0 jiffies so ensure
160 * we always return a positive value.
161 */
162 if (interval_jiffies <= 0)
163 interval_jiffies = 1;
164 return interval_jiffies;
cab70040
WM		 165}
166
1da177e4 167static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
63007727 168static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
1da177e4
LT		 169static void igmpv3_clear_delrec(struct in_device *in_dev);
170static int sf_setstate(struct ip_mc_list *pmc);
171static void sf_markstate(struct ip_mc_list *pmc);
172#endif
173static void ip_mc_clear_src(struct ip_mc_list *pmc);
8f935bbd
AV		 174static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
175 int sfcount, __be32 *psfsrc, int delta);
1da177e4
LT		 176
177static void ip_ma_put(struct ip_mc_list *im)
178{
179 if (atomic_dec_and_test(&im->refcnt)) {
180 in_dev_put(im->interface);
42ea299d 181 kfree_rcu(im, rcu);
1da177e4
LT		 182 }
183}
184
d9aa9380
DM		 185#define for_each_pmc_rcu(in_dev, pmc) \
186 for (pmc = rcu_dereference(in_dev->mc_list); \
187 pmc != NULL; \
188 pmc = rcu_dereference(pmc->next_rcu))
189
190#define for_each_pmc_rtnl(in_dev, pmc) \
191 for (pmc = rtnl_dereference(in_dev->mc_list); \
192 pmc != NULL; \
193 pmc = rtnl_dereference(pmc->next_rcu))
194
1da177e4
LT		 195#ifdef CONFIG_IP_MULTICAST
196
197/*
198 * Timer management
199 */
200
1d7138de 201static void igmp_stop_timer(struct ip_mc_list *im)
1da177e4
LT		 202{
203 spin_lock_bh(&im->lock);
204 if (del_timer(&im->timer))
205 atomic_dec(&im->refcnt);
a7e9ff73 206 im->tm_running = 0;
1da177e4
LT		 207 im->reporter = 0;
208 im->unsolicit_count = 0;
209 spin_unlock_bh(&im->lock);
210}
211
212/* It must be called with locked im->lock */
213static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
214{
63862b5b 215 int tv = prandom_u32() % max_delay;
1da177e4 216
a7e9ff73 217 im->tm_running = 1;
1da177e4
LT		 218 if (!mod_timer(&im->timer, jiffies+tv+2))
219 atomic_inc(&im->refcnt);
220}
221
222static void igmp_gq_start_timer(struct in_device *in_dev)
223{
63862b5b 224 int tv = prandom_u32() % in_dev->mr_maxdelay;
1da177e4
LT		 225
226 in_dev->mr_gq_running = 1;
227 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
228 in_dev_hold(in_dev);
229}
230
231static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
232{
63862b5b 233 int tv = prandom_u32() % delay;
1da177e4
LT		 234
235 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
236 in_dev_hold(in_dev);
237}
238
239static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
240{
241 spin_lock_bh(&im->lock);
242 im->unsolicit_count = 0;
243 if (del_timer(&im->timer)) {
244 if ((long)(im->timer.expires-jiffies) < max_delay) {
245 add_timer(&im->timer);
a7e9ff73 246 im->tm_running = 1;
1da177e4
LT		 247 spin_unlock_bh(&im->lock);
248 return;
249 }
250 atomic_dec(&im->refcnt);
251 }
252 igmp_start_timer(im, max_delay);
253 spin_unlock_bh(&im->lock);
254}
255
256
257/*
258 * Send an IGMP report.
259 */
260
261#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
262
263
264static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
265 int gdeleted, int sdeleted)
266{
267 switch (type) {
268 case IGMPV3_MODE_IS_INCLUDE:
269 case IGMPV3_MODE_IS_EXCLUDE:
270 if (gdeleted || sdeleted)
271 return 0;
ad12583f
DS		 272 if (!(pmc->gsquery && !psf->sf_gsresp)) {
273 if (pmc->sfmode == MCAST_INCLUDE)
274 return 1;
275 /* don't include if this source is excluded
276 * in all filters
277 */
278 if (psf->sf_count[MCAST_INCLUDE])
279 return type == IGMPV3_MODE_IS_INCLUDE;
280 return pmc->sfcount[MCAST_EXCLUDE] ==
281 psf->sf_count[MCAST_EXCLUDE];
282 }
283 return 0;
1da177e4
LT		 284 case IGMPV3_CHANGE_TO_INCLUDE:
285 if (gdeleted || sdeleted)
286 return 0;
287 return psf->sf_count[MCAST_INCLUDE] != 0;
288 case IGMPV3_CHANGE_TO_EXCLUDE:
289 if (gdeleted || sdeleted)
290 return 0;
291 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
292 psf->sf_count[MCAST_INCLUDE])
293 return 0;
294 return pmc->sfcount[MCAST_EXCLUDE] ==
295 psf->sf_count[MCAST_EXCLUDE];
296 case IGMPV3_ALLOW_NEW_SOURCES:
297 if (gdeleted || !psf->sf_crcount)
298 return 0;
299 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
300 case IGMPV3_BLOCK_OLD_SOURCES:
301 if (pmc->sfmode == MCAST_INCLUDE)
302 return gdeleted || (psf->sf_crcount && sdeleted);
303 return psf->sf_crcount && !gdeleted && !sdeleted;
304 }
305 return 0;
306}
307
308static int
309igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
310{
311 struct ip_sf_list *psf;
312 int scount = 0;
313
c71151f0 314 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 315 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
316 continue;
317 scount++;
318 }
319 return scount;
320}
321
4c672e4b 322static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
1da177e4
LT		 323{
324 struct sk_buff *skb;
325 struct rtable *rt;
326 struct iphdr *pip;
327 struct igmpv3_report *pig;
877acedc 328 struct net *net = dev_net(dev);
31e4543d 329 struct flowi4 fl4;
66088243
HX		 330 int hlen = LL_RESERVED_SPACE(dev);
331 int tlen = dev->needed_tailroom;
4c672e4b 332 unsigned int size = mtu;
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;
1da177e4 344
31e4543d 345 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
78fbfd8a
DM		 346 0, 0,
347 IPPROTO_IGMP, 0, dev->ifindex);
348 if (IS_ERR(rt)) {
349 kfree_skb(skb);
350 return NULL;
1da177e4 351 }
1da177e4 352
d8d1f30b 353 skb_dst_set(skb, &rt->dst);
1da177e4
LT		 354 skb->dev = dev;
355
4c672e4b
DB		 356 skb->reserved_tailroom = skb_end_offset(skb) -
357 min(mtu, skb_end_offset(skb));
66088243 358 skb_reserve(skb, hlen);
1da177e4 359
7e28ecc2 360 skb_reset_network_header(skb);
eddc9ec5 361 pip = ip_hdr(skb);
7e28ecc2 362 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 363
364 pip->version = 4;
365 pip->ihl = (sizeof(struct iphdr)+4)>>2;
366 pip->tos = 0xc0;
367 pip->frag_off = htons(IP_DF);
368 pip->ttl = 1;
492f64ce
DM		 369 pip->daddr = fl4.daddr;
370 pip->saddr = fl4.saddr;
1da177e4
LT		 371 pip->protocol = IPPROTO_IGMP;
372 pip->tot_len = 0; /* filled in later */
73f156a6 373 ip_select_ident(skb, NULL);
5e73ea1a
DB		 374 ((u8 *)&pip[1])[0] = IPOPT_RA;
375 ((u8 *)&pip[1])[1] = 4;
376 ((u8 *)&pip[1])[2] = 0;
377 ((u8 *)&pip[1])[3] = 0;
1da177e4 378
b0e380b1 379 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
d10ba34b 380 skb_put(skb, sizeof(*pig));
d9edf9e2 381 pig = igmpv3_report_hdr(skb);
1da177e4
LT		 382 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
383 pig->resv1 = 0;
384 pig->csum = 0;
385 pig->resv2 = 0;
386 pig->ngrec = 0;
387 return skb;
388}
389
390static int igmpv3_sendpack(struct sk_buff *skb)
391{
d9edf9e2 392 struct igmphdr *pig = igmp_hdr(skb);
f7c0c2ae 393 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
1da177e4 394
d9edf9e2 395 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
1da177e4 396
c439cb2e 397 return ip_local_out(skb);
1da177e4
LT		 398}
399
400static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
401{
a7e9ff73 402 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
1da177e4
LT		 403}
404
405static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
406 int type, struct igmpv3_grec **ppgr)
407{
408 struct net_device *dev = pmc->interface->dev;
409 struct igmpv3_report *pih;
410 struct igmpv3_grec *pgr;
411
412 if (!skb)
413 skb = igmpv3_newpack(dev, dev->mtu);
414 if (!skb)
415 return NULL;
416 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
417 pgr->grec_type = type;
418 pgr->grec_auxwords = 0;
419 pgr->grec_nsrcs = 0;
420 pgr->grec_mca = pmc->multiaddr;
d9edf9e2 421 pih = igmpv3_report_hdr(skb);
1da177e4
LT		 422 pih->ngrec = htons(ntohs(pih->ngrec)+1);
423 *ppgr = pgr;
424 return skb;
425}
426
4c672e4b 427#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1da177e4
LT		 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;
73f156a6 717 ip_select_ident(skb, 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;
a9fe8e29 759 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1da177e4
LT		 760 igmp_ifc_start_timer(in_dev, 1);
761}
762
763
764static void igmp_timer_expire(unsigned long data)
765{
c71151f0 766 struct ip_mc_list *im = (struct ip_mc_list *)data;
1da177e4
LT		 767 struct in_device *in_dev = im->interface;
768
769 spin_lock(&im->lock);
a7e9ff73 770 im->tm_running = 0;
1da177e4
LT		 771
772 if (im->unsolicit_count) {
773 im->unsolicit_count--;
cab70040 774 igmp_start_timer(im, unsolicited_report_interval(in_dev));
1da177e4
LT		 775 }
776 im->reporter = 1;
777 spin_unlock(&im->lock);
778
779 if (IGMP_V1_SEEN(in_dev))
780 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
781 else if (IGMP_V2_SEEN(in_dev))
782 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
783 else
784 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
785
786 ip_ma_put(im);
787}
788
ad12583f 789/* mark EXCLUDE-mode sources */
ea4d9e72 790static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 791{
792 struct ip_sf_list *psf;
793 int i, scount;
794
ad12583f 795 scount = 0;
c71151f0 796 for (psf = pmc->sources; psf; psf = psf->sf_next) {
ad12583f
DS		 797 if (scount == nsrcs)
798 break;
c71151f0 799 for (i = 0; i < nsrcs; i++) {
ad12583f 800 /* skip inactive filters */
e05c4ad3 801 if (psf->sf_count[MCAST_INCLUDE] ||
ad12583f
DS		 802 pmc->sfcount[MCAST_EXCLUDE] !=
803 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 804 break;
ad12583f
DS		 805 if (srcs[i] == psf->sf_inaddr) {
806 scount++;
807 break;
808 }
809 }
810 }
811 pmc->gsquery = 0;
812 if (scount == nsrcs) /* all sources excluded */
813 return 0;
814 return 1;
815}
816
ea4d9e72 817static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 818{
819 struct ip_sf_list *psf;
820 int i, scount;
821
822 if (pmc->sfmode == MCAST_EXCLUDE)
823 return igmp_xmarksources(pmc, nsrcs, srcs);
824
825 /* mark INCLUDE-mode sources */
1da177e4 826 scount = 0;
c71151f0 827 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 828 if (scount == nsrcs)
829 break;
c71151f0 830 for (i = 0; i < nsrcs; i++)
1da177e4
LT		 831 if (srcs[i] == psf->sf_inaddr) {
832 psf->sf_gsresp = 1;
833 scount++;
834 break;
835 }
836 }
ad12583f
DS		 837 if (!scount) {
838 pmc->gsquery = 0;
839 return 0;
840 }
841 pmc->gsquery = 1;
842 return 1;
1da177e4
LT		 843}
844
d679c532
ED		 845/* return true if packet was dropped */
846static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 847{
848 struct ip_mc_list *im;
849
850 /* Timers are only set for non-local groups */
851
852 if (group == IGMP_ALL_HOSTS)
d679c532 853 return false;
1da177e4 854
1d7138de
ED		 855 rcu_read_lock();
856 for_each_pmc_rcu(in_dev, im) {
1da177e4
LT		 857 if (im->multiaddr == group) {
858 igmp_stop_timer(im);
859 break;
860 }
861 }
1d7138de 862 rcu_read_unlock();
d679c532 863 return false;
1da177e4
LT		 864}
865
d679c532
ED		 866/* return true if packet was dropped */
867static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
1da177e4
LT		 868 int len)
869{
d9edf9e2
ACM		 870 struct igmphdr *ih = igmp_hdr(skb);
871 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
1da177e4 872 struct ip_mc_list *im;
63007727 873 __be32 group = ih->group;
1da177e4
LT		 874 int max_delay;
875 int mark = 0;
876
877
5b7c8406 878 if (len == 8) {
1da177e4
LT		 879 if (ih->code == 0) {
880 /* Alas, old v1 router presents here. */
e905a9ed 881
436f7c20 882 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
1da177e4 883 in_dev->mr_v1_seen = jiffies +
436f7c20 884 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
1da177e4
LT		 885 group = 0;
886 } else {
887 /* v2 router present */
888 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
889 in_dev->mr_v2_seen = jiffies +
436f7c20 890 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
1da177e4
LT		 891 }
892 /* cancel the interface change timer */
893 in_dev->mr_ifc_count = 0;
894 if (del_timer(&in_dev->mr_ifc_timer))
895 __in_dev_put(in_dev);
896 /* clear deleted report items */
897 igmpv3_clear_delrec(in_dev);
898 } else if (len < 12) {
d679c532 899 return true; /* ignore bogus packet; freed by caller */
5b7c8406
DS		 900 } else if (IGMP_V1_SEEN(in_dev)) {
901 /* This is a v3 query with v1 queriers present */
436f7c20 902 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
5b7c8406
DS		 903 group = 0;
904 } else if (IGMP_V2_SEEN(in_dev)) {
905 /* this is a v3 query with v2 queriers present;
906 * Interpretation of the max_delay code is problematic here.
907 * A real v2 host would use ih_code directly, while v3 has a
908 * different encoding. We use the v3 encoding as more likely
909 * to be intended in a v3 query.
910 */
911 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
a8c1f65c
BH		 912 if (!max_delay)
913 max_delay = 1; /* can't mod w/ 0 */
1da177e4
LT		 914 } else { /* v3 */
915 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
d679c532 916 return true;
e905a9ed 917
d9edf9e2 918 ih3 = igmpv3_query_hdr(skb);
1da177e4 919 if (ih3->nsrcs) {
e905a9ed 920 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 921 + ntohs(ih3->nsrcs)*sizeof(__be32)))
d679c532 922 return true;
d9edf9e2 923 ih3 = igmpv3_query_hdr(skb);
1da177e4
LT		 924 }
925
926 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
927 if (!max_delay)
928 max_delay = 1; /* can't mod w/ 0 */
929 in_dev->mr_maxdelay = max_delay;
930 if (ih3->qrv)
931 in_dev->mr_qrv = ih3->qrv;
932 if (!group) { /* general query */
933 if (ih3->nsrcs)
b47bd8d2 934 return true; /* no sources allowed */
1da177e4 935 igmp_gq_start_timer(in_dev);
d679c532 936 return false;
1da177e4
LT		 937 }
938 /* mark sources to include, if group & source-specific */
939 mark = ih3->nsrcs != 0;
940 }
941
942 /*
943 * - Start the timers in all of our membership records
944 * that the query applies to for the interface on
945 * which the query arrived excl. those that belong
946 * to a "local" group (224.0.0.X)
947 * - For timers already running check if they need to
948 * be reset.
949 * - Use the igmp->igmp_code field as the maximum
950 * delay possible
951 */
1d7138de
ED		 952 rcu_read_lock();
953 for_each_pmc_rcu(in_dev, im) {
ad12583f
DS		 954 int changed;
955
1da177e4
LT		 956 if (group && group != im->multiaddr)
957 continue;
958 if (im->multiaddr == IGMP_ALL_HOSTS)
959 continue;
960 spin_lock_bh(&im->lock);
961 if (im->tm_running)
962 im->gsquery = im->gsquery && mark;
963 else
964 im->gsquery = mark;
ad12583f 965 changed = !im->gsquery ||
e905a9ed 966 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 967 spin_unlock_bh(&im->lock);
ad12583f
DS		 968 if (changed)
969 igmp_mod_timer(im, max_delay);
1da177e4 970 }
1d7138de 971 rcu_read_unlock();
d679c532 972 return false;
1da177e4
LT		 973}
974
9a57a9d2 975/* called in rcu_read_lock() section */
1da177e4
LT		 976int igmp_rcv(struct sk_buff *skb)
977{
978 /* This basically follows the spec line by line -- see RFC1112 */
979 struct igmphdr *ih;
9a57a9d2 980 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1da177e4 981 int len = skb->len;
d679c532 982 bool dropped = true;
1da177e4 983
cd557bc1
DL		 984 if (in_dev == NULL)
985 goto drop;
1da177e4 986
fb286bb2 987 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
9a57a9d2 988 goto drop;
fb286bb2 989
de08dc1a
TH		 990 if (skb_checksum_simple_validate(skb))
991 goto drop;
1da177e4 992
d9edf9e2 993 ih = igmp_hdr(skb);
1da177e4
LT		 994 switch (ih->type) {
995 case IGMP_HOST_MEMBERSHIP_QUERY:
d679c532 996 dropped = igmp_heard_query(in_dev, skb, len);
1da177e4
LT		 997 break;
998 case IGMP_HOST_MEMBERSHIP_REPORT:
999 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1da177e4 1000 /* Is it our report looped back? */
c7537967 1001 if (rt_is_output_route(skb_rtable(skb)))
1da177e4 1002 break;
24c69275
DS		 1003 /* don't rely on MC router hearing unicast reports */
1004 if (skb->pkt_type == PACKET_MULTICAST ||
1005 skb->pkt_type == PACKET_BROADCAST)
d679c532 1006 dropped = igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 1007 break;
1008 case IGMP_PIM:
1009#ifdef CONFIG_IP_PIMSM_V1
1da177e4
LT		 1010 return pim_rcv_v1(skb);
1011#endif
c6b471e6 1012 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1da177e4
LT		 1013 case IGMP_DVMRP:
1014 case IGMP_TRACE:
1015 case IGMP_HOST_LEAVE_MESSAGE:
1016 case IGMP_MTRACE:
1017 case IGMP_MTRACE_RESP:
1018 break;
1019 default:
dd1c1853 1020 break;
1da177e4 1021 }
fb286bb2 1022
cd557bc1 1023drop:
d679c532
ED		 1024 if (dropped)
1025 kfree_skb(skb);
1026 else
1027 consume_skb(skb);
1da177e4
LT		 1028 return 0;
1029}
1030
1031#endif
1032
1033
1034/*
1035 * Add a filter to a device
1036 */
1037
63007727 1038static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1039{
1040 char buf[MAX_ADDR_LEN];
1041 struct net_device *dev = in_dev->dev;
1042
1043 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1044 We will get multicast token leakage, when IFF_MULTICAST
b81693d9 1045 is changed. This check should be done in ndo_set_rx_mode
1da177e4
LT		 1046 routine. Something sort of:
1047 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1048 --ANK
1049 */
1050 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1051 dev_mc_add(dev, buf);
1da177e4
LT		 1052}
1053
1054/*
1055 * Remove a filter from a device
1056 */
1057
63007727 1058static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1059{
1060 char buf[MAX_ADDR_LEN];
1061 struct net_device *dev = in_dev->dev;
1062
1063 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1064 dev_mc_del(dev, buf);
1da177e4
LT		 1065}
1066
1067#ifdef CONFIG_IP_MULTICAST
1068/*
1069 * deleted ip_mc_list manipulation
1070 */
1071static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1072{
1073 struct ip_mc_list *pmc;
1074
1075 /* this is an "ip_mc_list" for convenience; only the fields below
1076 * are actually used. In particular, the refcnt and users are not
1077 * used for management of the delete list. Using the same structure
1078 * for deleted items allows change reports to use common code with
1079 * non-deleted or query-response MCA's.
1080 */
0da974f4 1081 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1082 if (!pmc)
1083 return;
1da177e4
LT		 1084 spin_lock_bh(&im->lock);
1085 pmc->interface = im->interface;
1086 in_dev_hold(in_dev);
1087 pmc->multiaddr = im->multiaddr;
a9fe8e29 1088 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1da177e4
LT		 1089 pmc->sfmode = im->sfmode;
1090 if (pmc->sfmode == MCAST_INCLUDE) {
1091 struct ip_sf_list *psf;
1092
1093 pmc->tomb = im->tomb;
1094 pmc->sources = im->sources;
1095 im->tomb = im->sources = NULL;
c71151f0 1096 for (psf = pmc->sources; psf; psf = psf->sf_next)
1da177e4
LT		 1097 psf->sf_crcount = pmc->crcount;
1098 }
1099 spin_unlock_bh(&im->lock);
1100
1101 spin_lock_bh(&in_dev->mc_tomb_lock);
1102 pmc->next = in_dev->mc_tomb;
1103 in_dev->mc_tomb = pmc;
1104 spin_unlock_bh(&in_dev->mc_tomb_lock);
1105}
1106
63007727 1107static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1108{
1109 struct ip_mc_list *pmc, *pmc_prev;
1110 struct ip_sf_list *psf, *psf_next;
1111
1112 spin_lock_bh(&in_dev->mc_tomb_lock);
1113 pmc_prev = NULL;
c71151f0 1114 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1da177e4
LT		 1115 if (pmc->multiaddr == multiaddr)
1116 break;
1117 pmc_prev = pmc;
1118 }
1119 if (pmc) {
1120 if (pmc_prev)
1121 pmc_prev->next = pmc->next;
1122 else
1123 in_dev->mc_tomb = pmc->next;
1124 }
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1126 if (pmc) {
c71151f0 1127 for (psf = pmc->tomb; psf; psf = psf_next) {
1da177e4
LT		 1128 psf_next = psf->sf_next;
1129 kfree(psf);
1130 }
1131 in_dev_put(pmc->interface);
1132 kfree(pmc);
1133 }
1134}
1135
1136static void igmpv3_clear_delrec(struct in_device *in_dev)
1137{
1138 struct ip_mc_list *pmc, *nextpmc;
1139
1140 spin_lock_bh(&in_dev->mc_tomb_lock);
1141 pmc = in_dev->mc_tomb;
1142 in_dev->mc_tomb = NULL;
1143 spin_unlock_bh(&in_dev->mc_tomb_lock);
1144
1145 for (; pmc; pmc = nextpmc) {
1146 nextpmc = pmc->next;
1147 ip_mc_clear_src(pmc);
1148 in_dev_put(pmc->interface);
1149 kfree(pmc);
1150 }
1151 /* clear dead sources, too */
1d7138de
ED		 1152 rcu_read_lock();
1153 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1154 struct ip_sf_list *psf, *psf_next;
1155
1156 spin_lock_bh(&pmc->lock);
1157 psf = pmc->tomb;
1158 pmc->tomb = NULL;
1159 spin_unlock_bh(&pmc->lock);
c71151f0 1160 for (; psf; psf = psf_next) {
1da177e4
LT		 1161 psf_next = psf->sf_next;
1162 kfree(psf);
1163 }
1164 }
1d7138de 1165 rcu_read_unlock();
1da177e4
LT		 1166}
1167#endif
1168
1169static void igmp_group_dropped(struct ip_mc_list *im)
1170{
1171 struct in_device *in_dev = im->interface;
1172#ifdef CONFIG_IP_MULTICAST
1173 int reporter;
1174#endif
1175
1176 if (im->loaded) {
1177 im->loaded = 0;
1178 ip_mc_filter_del(in_dev, im->multiaddr);
1179 }
1180
1181#ifdef CONFIG_IP_MULTICAST
1182 if (im->multiaddr == IGMP_ALL_HOSTS)
1183 return;
1184
1185 reporter = im->reporter;
1186 igmp_stop_timer(im);
1187
1188 if (!in_dev->dead) {
1189 if (IGMP_V1_SEEN(in_dev))
24cf3af3 1190 return;
1da177e4
LT		 1191 if (IGMP_V2_SEEN(in_dev)) {
1192 if (reporter)
1193 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
24cf3af3 1194 return;
1da177e4
LT		 1195 }
1196 /* IGMPv3 */
1197 igmpv3_add_delrec(in_dev, im);
1198
1199 igmp_ifc_event(in_dev);
1200 }
1da177e4 1201#endif
1da177e4
LT		 1202}
1203
1204static void igmp_group_added(struct ip_mc_list *im)
1205{
1206 struct in_device *in_dev = im->interface;
1207
1208 if (im->loaded == 0) {
1209 im->loaded = 1;
1210 ip_mc_filter_add(in_dev, im->multiaddr);
1211 }
1212
1213#ifdef CONFIG_IP_MULTICAST
1214 if (im->multiaddr == IGMP_ALL_HOSTS)
1215 return;
1216
1217 if (in_dev->dead)
1218 return;
1219 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1220 spin_lock_bh(&im->lock);
436f7c20 1221 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1da177e4
LT		 1222 spin_unlock_bh(&im->lock);
1223 return;
1224 }
1225 /* else, v3 */
1226
a9fe8e29 1227 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1da177e4
LT		 1228 igmp_ifc_event(in_dev);
1229#endif
1230}
1231
1232
1233/*
1234 * Multicast list managers
1235 */
1236
e9897071
ED		 1237static u32 ip_mc_hash(const struct ip_mc_list *im)
1238{
c70eba74 1239 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
e9897071
ED		 1240}
1241
1242static void ip_mc_hash_add(struct in_device *in_dev,
1243 struct ip_mc_list *im)
1244{
1245 struct ip_mc_list __rcu **mc_hash;
1246 u32 hash;
1247
1248 mc_hash = rtnl_dereference(in_dev->mc_hash);
1249 if (mc_hash) {
1250 hash = ip_mc_hash(im);
c70eba74 1251 im->next_hash = mc_hash[hash];
e9897071
ED		 1252 rcu_assign_pointer(mc_hash[hash], im);
1253 return;
1254 }
1255
1256 /* do not use a hash table for small number of items */
1257 if (in_dev->mc_count < 4)
1258 return;
1259
1260 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1261 GFP_KERNEL);
1262 if (!mc_hash)
1263 return;
1264
1265 for_each_pmc_rtnl(in_dev, im) {
1266 hash = ip_mc_hash(im);
c70eba74 1267 im->next_hash = mc_hash[hash];
e9897071
ED		 1268 RCU_INIT_POINTER(mc_hash[hash], im);
1269 }
1270
1271 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1272}
1273
1274static void ip_mc_hash_remove(struct in_device *in_dev,
1275 struct ip_mc_list *im)
1276{
1277 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1278 struct ip_mc_list *aux;
1279
1280 if (!mc_hash)
1281 return;
1282 mc_hash += ip_mc_hash(im);
1283 while ((aux = rtnl_dereference(*mc_hash)) != im)
1284 mc_hash = &aux->next_hash;
1285 *mc_hash = im->next_hash;
1286}
1287
1da177e4
LT		 1288
1289/*
1290 * A socket has joined a multicast group on device dev.
1291 */
1292
8f935bbd 1293void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1294{
1295 struct ip_mc_list *im;
1296
1297 ASSERT_RTNL();
1298
1d7138de 1299 for_each_pmc_rtnl(in_dev, im) {
1da177e4
LT		 1300 if (im->multiaddr == addr) {
1301 im->users++;
1302 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1303 goto out;
1304 }
1305 }
1306
1d7138de 1307 im = kzalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1308 if (!im)
1309 goto out;
1310
a7e9ff73
JK		 1311 im->users = 1;
1312 im->interface = in_dev;
1da177e4 1313 in_dev_hold(in_dev);
a7e9ff73 1314 im->multiaddr = addr;
1da177e4
LT		 1315 /* initial mode is (EX, empty) */
1316 im->sfmode = MCAST_EXCLUDE;
1da177e4 1317 im->sfcount[MCAST_EXCLUDE] = 1;
1da177e4
LT		 1318 atomic_set(&im->refcnt, 1);
1319 spin_lock_init(&im->lock);
1320#ifdef CONFIG_IP_MULTICAST
179542a5 1321 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
a9fe8e29 1322 im->unsolicit_count = sysctl_igmp_qrv;
1da177e4 1323#endif
1d7138de
ED		 1324
1325 im->next_rcu = in_dev->mc_list;
b8bae41e 1326 in_dev->mc_count++;
cf778b00 1327 rcu_assign_pointer(in_dev->mc_list, im);
1d7138de 1328
e9897071
ED		 1329 ip_mc_hash_add(in_dev, im);
1330
1da177e4
LT		 1331#ifdef CONFIG_IP_MULTICAST
1332 igmpv3_del_delrec(in_dev, im->multiaddr);
1333#endif
1334 igmp_group_added(im);
1335 if (!in_dev->dead)
1336 ip_rt_multicast_event(in_dev);
1337out:
1338 return;
1339}
4bc2f18b 1340EXPORT_SYMBOL(ip_mc_inc_group);
1da177e4 1341
a816c7c7 1342/*
4aa5dee4 1343 * Resend IGMP JOIN report; used by netdev notifier.
a816c7c7 1344 */
4aa5dee4 1345static void ip_mc_rejoin_groups(struct in_device *in_dev)
a816c7c7 1346{
08882669 1347#ifdef CONFIG_IP_MULTICAST
866f3b25
ED		 1348 struct ip_mc_list *im;
1349 int type;
a816c7c7 1350
4aa5dee4
JP		 1351 ASSERT_RTNL();
1352
1353 for_each_pmc_rtnl(in_dev, im) {
866f3b25
ED		 1354 if (im->multiaddr == IGMP_ALL_HOSTS)
1355 continue;
a816c7c7 1356
866f3b25
ED		 1357 /* a failover is happening and switches
1358 * must be notified immediately
1359 */
1360 if (IGMP_V1_SEEN(in_dev))
1361 type = IGMP_HOST_MEMBERSHIP_REPORT;
1362 else if (IGMP_V2_SEEN(in_dev))
1363 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1364 else
1365 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1366 igmp_send_report(in_dev, im, type);
1367 }
a816c7c7
JV		 1368#endif
1369}
1370
1da177e4
LT		 1371/*
1372 * A socket has left a multicast group on device dev
1373 */
1374
8f935bbd 1375void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1da177e4 1376{
1d7138de
ED		 1377 struct ip_mc_list *i;
1378 struct ip_mc_list __rcu **ip;
e905a9ed 1379
1da177e4 1380 ASSERT_RTNL();
e905a9ed 1381
1d7138de
ED		 1382 for (ip = &in_dev->mc_list;
1383 (i = rtnl_dereference(*ip)) != NULL;
1384 ip = &i->next_rcu) {
a7e9ff73 1385 if (i->multiaddr == addr) {
1da177e4 1386 if (--i->users == 0) {
e9897071 1387 ip_mc_hash_remove(in_dev, i);
1d7138de 1388 *ip = i->next_rcu;
b8bae41e 1389 in_dev->mc_count--;
1da177e4 1390 igmp_group_dropped(i);
24cf3af3 1391 ip_mc_clear_src(i);
1da177e4
LT		 1392
1393 if (!in_dev->dead)
1394 ip_rt_multicast_event(in_dev);
1395
1396 ip_ma_put(i);
1397 return;
1398 }
1399 break;
1400 }
1401 }
1402}
4bc2f18b 1403EXPORT_SYMBOL(ip_mc_dec_group);
1da177e4 1404
75c78500
MS		 1405/* Device changing type */
1406
1407void ip_mc_unmap(struct in_device *in_dev)
1408{
1d7138de 1409 struct ip_mc_list *pmc;
75c78500
MS		 1410
1411 ASSERT_RTNL();
1412
1d7138de
ED		 1413 for_each_pmc_rtnl(in_dev, pmc)
1414 igmp_group_dropped(pmc);
75c78500
MS		 1415}
1416
1417void ip_mc_remap(struct in_device *in_dev)
1418{
1d7138de 1419 struct ip_mc_list *pmc;
75c78500
MS		 1420
1421 ASSERT_RTNL();
1422
1d7138de
ED		 1423 for_each_pmc_rtnl(in_dev, pmc)
1424 igmp_group_added(pmc);
75c78500
MS		 1425}
1426
1da177e4
LT		 1427/* Device going down */
1428
1429void ip_mc_down(struct in_device *in_dev)
1430{
1d7138de 1431 struct ip_mc_list *pmc;
1da177e4
LT		 1432
1433 ASSERT_RTNL();
1434
1d7138de
ED		 1435 for_each_pmc_rtnl(in_dev, pmc)
1436 igmp_group_dropped(pmc);
1da177e4
LT		 1437
1438#ifdef CONFIG_IP_MULTICAST
1439 in_dev->mr_ifc_count = 0;
1440 if (del_timer(&in_dev->mr_ifc_timer))
1441 __in_dev_put(in_dev);
1442 in_dev->mr_gq_running = 0;
1443 if (del_timer(&in_dev->mr_gq_timer))
1444 __in_dev_put(in_dev);
1445 igmpv3_clear_delrec(in_dev);
1446#endif
1447
1448 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1449}
1450
1451void ip_mc_init_dev(struct in_device *in_dev)
1452{
1453 ASSERT_RTNL();
1454
1da177e4 1455#ifdef CONFIG_IP_MULTICAST
b24b8a24
PE		 1456 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1457 (unsigned long)in_dev);
b24b8a24
PE		 1458 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1459 (unsigned long)in_dev);
a9fe8e29 1460 in_dev->mr_qrv = sysctl_igmp_qrv;
1da177e4
LT		 1461#endif
1462
1da177e4
LT		 1463 spin_lock_init(&in_dev->mc_tomb_lock);
1464}
1465
1466/* Device going up */
1467
1468void ip_mc_up(struct in_device *in_dev)
1469{
1d7138de 1470 struct ip_mc_list *pmc;
1da177e4
LT		 1471
1472 ASSERT_RTNL();
1473
a9fe8e29
HFS		 1474#ifdef CONFIG_IP_MULTICAST
1475 in_dev->mr_qrv = sysctl_igmp_qrv;
1476#endif
1da177e4
LT		 1477 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1478
1d7138de
ED		 1479 for_each_pmc_rtnl(in_dev, pmc)
1480 igmp_group_added(pmc);
1da177e4
LT		 1481}
1482
1483/*
1484 * Device is about to be destroyed: clean up.
1485 */
1486
1487void ip_mc_destroy_dev(struct in_device *in_dev)
1488{
1489 struct ip_mc_list *i;
1490
1491 ASSERT_RTNL();
1492
1493 /* Deactivate timers */
1494 ip_mc_down(in_dev);
1495
1d7138de
ED		 1496 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1497 in_dev->mc_list = i->next_rcu;
b8bae41e 1498 in_dev->mc_count--;
1d7138de 1499
24cf3af3
VF		 1500 /* We've dropped the groups in ip_mc_down already */
1501 ip_mc_clear_src(i);
1da177e4 1502 ip_ma_put(i);
1da177e4 1503 }
1da177e4
LT		 1504}
1505
9e917dca 1506/* RTNL is locked */
877acedc 1507static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1da177e4 1508{
1da177e4
LT		 1509 struct net_device *dev = NULL;
1510 struct in_device *idev = NULL;
1511
1512 if (imr->imr_ifindex) {
877acedc 1513 idev = inetdev_by_index(net, imr->imr_ifindex);
1da177e4
LT		 1514 return idev;
1515 }
1516 if (imr->imr_address.s_addr) {
9e917dca 1517 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1da177e4
LT		 1518 if (!dev)
1519 return NULL;
1da177e4
LT		 1520 }
1521
b23dd4fe 1522 if (!dev) {
78fbfd8a
DM		 1523 struct rtable *rt = ip_route_output(net,
1524 imr->imr_multiaddr.s_addr,
1525 0, 0, 0);
b23dd4fe
DM		 1526 if (!IS_ERR(rt)) {
1527 dev = rt->dst.dev;
1528 ip_rt_put(rt);
1529 }
1da177e4
LT		 1530 }
1531 if (dev) {
1532 imr->imr_ifindex = dev->ifindex;
e5ed6399 1533 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1534 }
1535 return idev;
1536}
1537
1538/*
1539 * Join a socket to a group
1540 */
ab32ea5d
BH		 1541int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1542int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
a9fe8e29 1543#ifdef CONFIG_IP_MULTICAST
436f7c20 1544int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
a9fe8e29 1545#endif
1da177e4
LT		 1546
1547static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1548 __be32 *psfsrc)
1da177e4
LT		 1549{
1550 struct ip_sf_list *psf, *psf_prev;
1551 int rv = 0;
1552
1553 psf_prev = NULL;
c71151f0 1554 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 1555 if (psf->sf_inaddr == *psfsrc)
1556 break;
1557 psf_prev = psf;
1558 }
1559 if (!psf || psf->sf_count[sfmode] == 0) {
1560 /* source filter not found, or count wrong => bug */
1561 return -ESRCH;
1562 }
1563 psf->sf_count[sfmode]--;
1564 if (psf->sf_count[sfmode] == 0) {
1565 ip_rt_multicast_event(pmc->interface);
1566 }
1567 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1568#ifdef CONFIG_IP_MULTICAST
1569 struct in_device *in_dev = pmc->interface;
1570#endif
1571
1572 /* no more filters for this source */
1573 if (psf_prev)
1574 psf_prev->sf_next = psf->sf_next;
1575 else
1576 pmc->sources = psf->sf_next;
1577#ifdef CONFIG_IP_MULTICAST
1578 if (psf->sf_oldin &&
1579 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
a9fe8e29 1580 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1da177e4
LT		 1581 psf->sf_next = pmc->tomb;
1582 pmc->tomb = psf;
1583 rv = 1;
1584 } else
1585#endif
1586 kfree(psf);
1587 }
1588 return rv;
1589}
1590
1591#ifndef CONFIG_IP_MULTICAST
1592#define igmp_ifc_event(x) do { } while (0)
1593#endif
1594
8f935bbd
AV		 1595static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1596 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1597{
1598 struct ip_mc_list *pmc;
1599 int changerec = 0;
1600 int i, err;
1601
1602 if (!in_dev)
1603 return -ENODEV;
1d7138de
ED		 1604 rcu_read_lock();
1605 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1606 if (*pmca == pmc->multiaddr)
1607 break;
1608 }
1609 if (!pmc) {
1610 /* MCA not found?? bug */
1d7138de 1611 rcu_read_unlock();
1da177e4
LT		 1612 return -ESRCH;
1613 }
1614 spin_lock_bh(&pmc->lock);
1d7138de 1615 rcu_read_unlock();
1da177e4
LT		 1616#ifdef CONFIG_IP_MULTICAST
1617 sf_markstate(pmc);
1618#endif
1619 if (!delta) {
1620 err = -EINVAL;
1621 if (!pmc->sfcount[sfmode])
1622 goto out_unlock;
1623 pmc->sfcount[sfmode]--;
1624 }
1625 err = 0;
c71151f0 1626 for (i = 0; i < sfcount; i++) {
1da177e4
LT		 1627 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1628
1629 changerec |= rv > 0;
1630 if (!err && rv < 0)
1631 err = rv;
1632 }
1633 if (pmc->sfmode == MCAST_EXCLUDE &&
1634 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1635 pmc->sfcount[MCAST_INCLUDE]) {
1636#ifdef CONFIG_IP_MULTICAST
1637 struct ip_sf_list *psf;
1638#endif
1639
1640 /* filter mode change */
1641 pmc->sfmode = MCAST_INCLUDE;
1642#ifdef CONFIG_IP_MULTICAST
a9fe8e29 1643 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1da177e4 1644 in_dev->mr_ifc_count = pmc->crcount;
c71151f0 1645 for (psf = pmc->sources; psf; psf = psf->sf_next)
1da177e4
LT		 1646 psf->sf_crcount = 0;
1647 igmp_ifc_event(pmc->interface);
1648 } else if (sf_setstate(pmc) || changerec) {
1649 igmp_ifc_event(pmc->interface);
1650#endif
1651 }
1652out_unlock:
1653 spin_unlock_bh(&pmc->lock);
1654 return err;
1655}
1656
1657/*
1658 * Add multicast single-source filter to the interface list
1659 */
1660static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
5eb81e89 1661 __be32 *psfsrc)
1da177e4
LT		 1662{
1663 struct ip_sf_list *psf, *psf_prev;
1664
1665 psf_prev = NULL;
c71151f0 1666 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 1667 if (psf->sf_inaddr == *psfsrc)
1668 break;
1669 psf_prev = psf;
1670 }
1671 if (!psf) {
0da974f4 1672 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1673 if (!psf)
1674 return -ENOBUFS;
1da177e4
LT		 1675 psf->sf_inaddr = *psfsrc;
1676 if (psf_prev) {
1677 psf_prev->sf_next = psf;
1678 } else
1679 pmc->sources = psf;
1680 }
1681 psf->sf_count[sfmode]++;
1682 if (psf->sf_count[sfmode] == 1) {
1683 ip_rt_multicast_event(pmc->interface);
1684 }
1685 return 0;
1686}
1687
1688#ifdef CONFIG_IP_MULTICAST
1689static void sf_markstate(struct ip_mc_list *pmc)
1690{
1691 struct ip_sf_list *psf;
1692 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1693
c71151f0 1694 for (psf = pmc->sources; psf; psf = psf->sf_next)
1da177e4
LT		 1695 if (pmc->sfcount[MCAST_EXCLUDE]) {
1696 psf->sf_oldin = mca_xcount ==
1697 psf->sf_count[MCAST_EXCLUDE] &&
1698 !psf->sf_count[MCAST_INCLUDE];
1699 } else
1700 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1701}
1702
1703static int sf_setstate(struct ip_mc_list *pmc)
1704{
ad12583f 1705 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1706 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1707 int qrv = pmc->interface->mr_qrv;
1708 int new_in, rv;
1709
1710 rv = 0;
c71151f0 1711 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 1712 if (pmc->sfcount[MCAST_EXCLUDE]) {
1713 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1714 !psf->sf_count[MCAST_INCLUDE];
1715 } else
1716 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1717 if (new_in) {
1718 if (!psf->sf_oldin) {
76edc605 1719 struct ip_sf_list *prev = NULL;
ad12583f 1720
c71151f0 1721 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
ad12583f
DS		 1722 if (dpsf->sf_inaddr == psf->sf_inaddr)
1723 break;
1724 prev = dpsf;
1725 }
1726 if (dpsf) {
1727 if (prev)
1728 prev->sf_next = dpsf->sf_next;
1729 else
1730 pmc->tomb = dpsf->sf_next;
1731 kfree(dpsf);
1732 }
1733 psf->sf_crcount = qrv;
1734 rv++;
1735 }
1736 } else if (psf->sf_oldin) {
1737
1738 psf->sf_crcount = 0;
1739 /*
1740 * add or update "delete" records if an active filter
1741 * is now inactive
1742 */
c71151f0 1743 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
ad12583f
DS		 1744 if (dpsf->sf_inaddr == psf->sf_inaddr)
1745 break;
1746 if (!dpsf) {
3ed37a6f 1747 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
ad12583f
DS		 1748 if (!dpsf)
1749 continue;
1750 *dpsf = *psf;
1751 /* pmc->lock held by callers */
1752 dpsf->sf_next = pmc->tomb;
1753 pmc->tomb = dpsf;
1754 }
1755 dpsf->sf_crcount = qrv;
1da177e4
LT		 1756 rv++;
1757 }
1758 }
1759 return rv;
1760}
1761#endif
1762
1763/*
1764 * Add multicast source filter list to the interface list
1765 */
8f935bbd
AV		 1766static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1767 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1768{
1769 struct ip_mc_list *pmc;
1770 int isexclude;
1771 int i, err;
1772
1773 if (!in_dev)
1774 return -ENODEV;
1d7138de
ED		 1775 rcu_read_lock();
1776 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1777 if (*pmca == pmc->multiaddr)
1778 break;
1779 }
1780 if (!pmc) {
1781 /* MCA not found?? bug */
1d7138de 1782 rcu_read_unlock();
1da177e4
LT		 1783 return -ESRCH;
1784 }
1785 spin_lock_bh(&pmc->lock);
1d7138de 1786 rcu_read_unlock();
1da177e4
LT		 1787
1788#ifdef CONFIG_IP_MULTICAST
1789 sf_markstate(pmc);
1790#endif
1791 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1792 if (!delta)
1793 pmc->sfcount[sfmode]++;
1794 err = 0;
c71151f0 1795 for (i = 0; i < sfcount; i++) {
5eb81e89 1796 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT		 1797 if (err)
1798 break;
1799 }
1800 if (err) {
1801 int j;
1802
685f94e6
JZ		 1803 if (!delta)
1804 pmc->sfcount[sfmode]--;
c71151f0 1805 for (j = 0; j < i; j++)
a1889c0d 1806 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4
LT		 1807 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1808#ifdef CONFIG_IP_MULTICAST
1da177e4 1809 struct ip_sf_list *psf;
cfcabdcc 1810 in_dev = pmc->interface;
1da177e4
LT		 1811#endif
1812
1813 /* filter mode change */
1814 if (pmc->sfcount[MCAST_EXCLUDE])
1815 pmc->sfmode = MCAST_EXCLUDE;
1816 else if (pmc->sfcount[MCAST_INCLUDE])
1817 pmc->sfmode = MCAST_INCLUDE;
1818#ifdef CONFIG_IP_MULTICAST
1819 /* else no filters; keep old mode for reports */
1820
a9fe8e29 1821 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1da177e4 1822 in_dev->mr_ifc_count = pmc->crcount;
c71151f0 1823 for (psf = pmc->sources; psf; psf = psf->sf_next)
1da177e4
LT		 1824 psf->sf_crcount = 0;
1825 igmp_ifc_event(in_dev);
1826 } else if (sf_setstate(pmc)) {
1827 igmp_ifc_event(in_dev);
1828#endif
1829 }
1830 spin_unlock_bh(&pmc->lock);
1831 return err;
1832}
1833
1834static void ip_mc_clear_src(struct ip_mc_list *pmc)
1835{
1836 struct ip_sf_list *psf, *nextpsf;
1837
c71151f0 1838 for (psf = pmc->tomb; psf; psf = nextpsf) {
1da177e4
LT		 1839 nextpsf = psf->sf_next;
1840 kfree(psf);
1841 }
1842 pmc->tomb = NULL;
c71151f0 1843 for (psf = pmc->sources; psf; psf = nextpsf) {
1da177e4
LT		 1844 nextpsf = psf->sf_next;
1845 kfree(psf);
1846 }
1847 pmc->sources = NULL;
1848 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1849 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1850 pmc->sfcount[MCAST_EXCLUDE] = 1;
1851}
1852
959d10f6 1853int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
1da177e4 1854{
8f935bbd 1855 __be32 addr = imr->imr_multiaddr.s_addr;
959d10f6 1856 struct ip_mc_socklist *iml, *i;
1da177e4
LT		 1857 struct in_device *in_dev;
1858 struct inet_sock *inet = inet_sk(sk);
877acedc 1859 struct net *net = sock_net(sk);
ca9b907d 1860 int ifindex;
1da177e4 1861 int count = 0;
959d10f6
ED		 1862 int err;
1863
1864 ASSERT_RTNL();
1da177e4 1865
f97c1e0c 1866 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1867 return -EINVAL;
1868
877acedc 1869 in_dev = ip_mc_find_dev(net, imr);
1da177e4
LT		 1870
1871 if (!in_dev) {
1da177e4
LT		 1872 err = -ENODEV;
1873 goto done;
1874 }
1875
1da177e4 1876 err = -EADDRINUSE;
ca9b907d 1877 ifindex = imr->imr_ifindex;
1d7138de 1878 for_each_pmc_rtnl(inet, i) {
ca9b907d
DS		 1879 if (i->multi.imr_multiaddr.s_addr == addr &&
1880 i->multi.imr_ifindex == ifindex)
1da177e4 1881 goto done;
1da177e4
LT		 1882 count++;
1883 }
1884 err = -ENOBUFS;
ca9b907d
DS		 1885 if (count >= sysctl_igmp_max_memberships)
1886 goto done;
a7e9ff73 1887 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
ca9b907d 1888 if (iml == NULL)
1da177e4 1889 goto done;
ca9b907d 1890
1da177e4 1891 memcpy(&iml->multi, imr, sizeof(*imr));
1d7138de 1892 iml->next_rcu = inet->mc_list;
1da177e4
LT		 1893 iml->sflist = NULL;
1894 iml->sfmode = MCAST_EXCLUDE;
cf778b00 1895 rcu_assign_pointer(inet->mc_list, iml);
1da177e4 1896 ip_mc_inc_group(in_dev, addr);
1da177e4 1897 err = 0;
1da177e4 1898done:
1da177e4
LT		 1899 return err;
1900}
959d10f6
ED		 1901EXPORT_SYMBOL(__ip_mc_join_group);
1902
1903/* Join a multicast group
1904 */
1905int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
1906{
1907 int ret;
1908
1909 rtnl_lock();
1910 ret = __ip_mc_join_group(sk, imr);
1911 rtnl_unlock();
1912
1913 return ret;
1914}
4bc2f18b 1915EXPORT_SYMBOL(ip_mc_join_group);
1da177e4
LT		 1916
1917static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1918 struct in_device *in_dev)
1919{
1d7138de 1920 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1da177e4
LT		 1921 int err;
1922
c85bb41e 1923 if (psf == NULL) {
1da177e4
LT		 1924 /* any-source empty exclude case */
1925 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1926 iml->sfmode, 0, NULL, 0);
1927 }
1928 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
c85bb41e 1929 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
a9b3cd7f 1930 RCU_INIT_POINTER(iml->sflist, NULL);
c85bb41e
FL		 1931 /* decrease mem now to avoid the memleak warning */
1932 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
7519cce4 1933 kfree_rcu(psf, rcu);
1da177e4
LT		 1934 return err;
1935}
1936
959d10f6 1937int __ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1da177e4
LT		 1938{
1939 struct inet_sock *inet = inet_sk(sk);
1d7138de
ED		 1940 struct ip_mc_socklist *iml;
1941 struct ip_mc_socklist __rcu **imlp;
84b42bae 1942 struct in_device *in_dev;
877acedc 1943 struct net *net = sock_net(sk);
8f935bbd 1944 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1945 u32 ifindex;
acd6e00b 1946 int ret = -EADDRNOTAVAIL;
1da177e4 1947
959d10f6
ED		 1948 ASSERT_RTNL();
1949
877acedc 1950 in_dev = ip_mc_find_dev(net, imr);
52ad353a 1951 if (!in_dev) {
1952 ret = -ENODEV;
1953 goto out;
1954 }
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 1971
52ad353a 1972 ip_mc_dec_group(in_dev, group);
959d10f6 1973
c85bb41e
FL		 1974 /* decrease mem now to avoid the memleak warning */
1975 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
10d50e74 1976 kfree_rcu(iml, rcu);
acd6e00b 1977 return 0;
1da177e4 1978 }
52ad353a 1979out:
959d10f6
ED		 1980 return ret;
1981}
1982EXPORT_SYMBOL(__ip_mc_leave_group);
1983
1984int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1985{
1986 int ret;
1987
1988 rtnl_lock();
1989 ret = __ip_mc_leave_group(sk, imr);
1da177e4 1990 rtnl_unlock();
959d10f6 1991
acd6e00b 1992 return ret;
1da177e4 1993}
193ba924 1994EXPORT_SYMBOL(ip_mc_leave_group);
1da177e4
LT		 1995
1996int ip_mc_source(int add, int omode, struct sock *sk, struct
1997 ip_mreq_source *mreqs, int ifindex)
1998{
1999 int err;
2000 struct ip_mreqn imr;
63007727 2001 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 2002 struct ip_mc_socklist *pmc;
2003 struct in_device *in_dev = NULL;
2004 struct inet_sock *inet = inet_sk(sk);
2005 struct ip_sf_socklist *psl;
877acedc 2006 struct net *net = sock_net(sk);
8cdaaa15 2007 int leavegroup = 0;
1da177e4
LT		 2008 int i, j, rv;
2009
f97c1e0c 2010 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2011 return -EINVAL;
2012
6756ae4b 2013 rtnl_lock();
1da177e4
LT		 2014
2015 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2016 imr.imr_address.s_addr = mreqs->imr_interface;
2017 imr.imr_ifindex = ifindex;
877acedc 2018 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2019
2020 if (!in_dev) {
2021 err = -ENODEV;
2022 goto done;
2023 }
2024 err = -EADDRNOTAVAIL;
2025
1d7138de 2026 for_each_pmc_rtnl(inet, pmc) {
f64f9e71
JP		 2027 if ((pmc->multi.imr_multiaddr.s_addr ==
2028 imr.imr_multiaddr.s_addr) &&
2029 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1da177e4
LT		 2030 break;
2031 }
917f2f10
DS		 2032 if (!pmc) { /* must have a prior join */
2033 err = -EINVAL;
1da177e4 2034 goto done;
917f2f10 2035 }
1da177e4
LT		 2036 /* if a source filter was set, must be the same mode as before */
2037 if (pmc->sflist) {
917f2f10
DS		 2038 if (pmc->sfmode != omode) {
2039 err = -EINVAL;
1da177e4 2040 goto done;
917f2f10 2041 }
1da177e4
LT		 2042 } else if (pmc->sfmode != omode) {
2043 /* allow mode switches for empty-set filters */
2044 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 2045 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 2046 NULL, 0);
2047 pmc->sfmode = omode;
2048 }
2049
1d7138de 2050 psl = rtnl_dereference(pmc->sflist);
1da177e4
LT		 2051 if (!add) {
2052 if (!psl)
917f2f10 2053 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 2054 rv = !0;
c71151f0 2055 for (i = 0; i < psl->sl_count; i++) {
1da177e4 2056 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 2057 sizeof(__be32));
1da177e4
LT		 2058 if (rv == 0)
2059 break;
2060 }
2061 if (rv) /* source not found */
917f2f10 2062 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 2063
8cdaaa15
DS		 2064 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2065 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2066 leavegroup = 1;
2067 goto done;
2068 }
2069
1da177e4 2070 /* update the interface filter */
e905a9ed 2071 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 2072 &mreqs->imr_sourceaddr, 1);
2073
c71151f0 2074 for (j = i+1; j < psl->sl_count; j++)
1da177e4
LT		 2075 psl->sl_addr[j-1] = psl->sl_addr[j];
2076 psl->sl_count--;
2077 err = 0;
2078 goto done;
2079 }
2080 /* else, add a new source to the filter */
2081
2082 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2083 err = -ENOBUFS;
2084 goto done;
2085 }
2086 if (!psl || psl->sl_count == psl->sl_max) {
2087 struct ip_sf_socklist *newpsl;
2088 int count = IP_SFBLOCK;
2089
2090 if (psl)
2091 count += psl->sl_max;
8b3a7005 2092 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 2093 if (!newpsl) {
2094 err = -ENOBUFS;
2095 goto done;
2096 }
2097 newpsl->sl_max = count;
2098 newpsl->sl_count = count - IP_SFBLOCK;
2099 if (psl) {
c71151f0 2100 for (i = 0; i < psl->sl_count; i++)
1da177e4 2101 newpsl->sl_addr[i] = psl->sl_addr[i];
c85bb41e
FL		 2102 /* decrease mem now to avoid the memleak warning */
2103 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
7519cce4 2104 kfree_rcu(psl, rcu);
1da177e4 2105 }
cf778b00 2106 rcu_assign_pointer(pmc->sflist, newpsl);
c85bb41e 2107 psl = newpsl;
1da177e4
LT		 2108 }
2109 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
c71151f0 2110 for (i = 0; i < psl->sl_count; i++) {
1da177e4 2111 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 2112 sizeof(__be32));
1da177e4
LT		 2113 if (rv == 0)
2114 break;
2115 }
2116 if (rv == 0) /* address already there is an error */
2117 goto done;
c71151f0 2118 for (j = psl->sl_count-1; j >= i; j--)
1da177e4
LT		 2119 psl->sl_addr[j+1] = psl->sl_addr[j];
2120 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2121 psl->sl_count++;
2122 err = 0;
2123 /* update the interface list */
e905a9ed 2124 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 2125 &mreqs->imr_sourceaddr, 1);
2126done:
6756ae4b 2127 rtnl_unlock();
8cdaaa15
DS		 2128 if (leavegroup)
2129 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2130 return err;
2131}
2132
2133int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2134{
9951f036 2135 int err = 0;
1da177e4 2136 struct ip_mreqn imr;
63007727 2137 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2138 struct ip_mc_socklist *pmc;
2139 struct in_device *in_dev;
2140 struct inet_sock *inet = inet_sk(sk);
2141 struct ip_sf_socklist *newpsl, *psl;
877acedc 2142 struct net *net = sock_net(sk);
9951f036 2143 int leavegroup = 0;
1da177e4 2144
f97c1e0c 2145 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2146 return -EINVAL;
2147 if (msf->imsf_fmode != MCAST_INCLUDE &&
2148 msf->imsf_fmode != MCAST_EXCLUDE)
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 = ifindex;
877acedc 2156 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2157
2158 if (!in_dev) {
2159 err = -ENODEV;
2160 goto done;
2161 }
1da177e4 2162
9951f036
DS		 2163 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2164 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2165 leavegroup = 1;
2166 goto done;
2167 }
2168
1d7138de 2169 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2170 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2171 pmc->multi.imr_ifindex == imr.imr_ifindex)
2172 break;
2173 }
917f2f10
DS		 2174 if (!pmc) { /* must have a prior join */
2175 err = -EINVAL;
1da177e4 2176 goto done;
917f2f10 2177 }
1da177e4 2178 if (msf->imsf_numsrc) {
8b3a7005
KK		 2179 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2180 GFP_KERNEL);
1da177e4
LT		 2181 if (!newpsl) {
2182 err = -ENOBUFS;
2183 goto done;
2184 }
2185 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2186 memcpy(newpsl->sl_addr, msf->imsf_slist,
2187 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2188 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2189 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2190 if (err) {
2191 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2192 goto done;
2193 }
8713dbf0 2194 } else {
1da177e4 2195 newpsl = NULL;
8713dbf0
YZ		 2196 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2197 msf->imsf_fmode, 0, NULL, 0);
2198 }
1d7138de 2199 psl = rtnl_dereference(pmc->sflist);
1da177e4
LT		 2200 if (psl) {
2201 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2202 psl->sl_count, psl->sl_addr, 0);
c85bb41e
FL		 2203 /* decrease mem now to avoid the memleak warning */
2204 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
7519cce4 2205 kfree_rcu(psl, rcu);
1da177e4
LT		 2206 } else
2207 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2208 0, NULL, 0);
cf778b00 2209 rcu_assign_pointer(pmc->sflist, newpsl);
1da177e4 2210 pmc->sfmode = msf->imsf_fmode;
917f2f10 2211 err = 0;
1da177e4 2212done:
6756ae4b 2213 rtnl_unlock();
9951f036
DS		 2214 if (leavegroup)
2215 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2216 return err;
2217}
2218
2219int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2220 struct ip_msfilter __user *optval, int __user *optlen)
2221{
2222 int err, len, count, copycount;
2223 struct ip_mreqn imr;
63007727 2224 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2225 struct ip_mc_socklist *pmc;
2226 struct in_device *in_dev;
2227 struct inet_sock *inet = inet_sk(sk);
2228 struct ip_sf_socklist *psl;
877acedc 2229 struct net *net = sock_net(sk);
1da177e4 2230
f97c1e0c 2231 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2232 return -EINVAL;
2233
6756ae4b 2234 rtnl_lock();
1da177e4
LT		 2235
2236 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2237 imr.imr_address.s_addr = msf->imsf_interface;
2238 imr.imr_ifindex = 0;
877acedc 2239 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2240
2241 if (!in_dev) {
2242 err = -ENODEV;
2243 goto done;
2244 }
2245 err = -EADDRNOTAVAIL;
2246
1d7138de 2247 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2248 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2249 pmc->multi.imr_ifindex == imr.imr_ifindex)
2250 break;
2251 }
2252 if (!pmc) /* must have a prior join */
2253 goto done;
2254 msf->imsf_fmode = pmc->sfmode;
1d7138de 2255 psl = rtnl_dereference(pmc->sflist);
6756ae4b 2256 rtnl_unlock();
1da177e4
LT		 2257 if (!psl) {
2258 len = 0;
2259 count = 0;
2260 } else {
2261 count = psl->sl_count;
2262 }
2263 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2264 len = copycount * sizeof(psl->sl_addr[0]);
2265 msf->imsf_numsrc = count;
2266 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2267 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2268 return -EFAULT;
2269 }
2270 if (len &&
2271 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2272 return -EFAULT;
2273 return 0;
2274done:
6756ae4b 2275 rtnl_unlock();
1da177e4
LT		 2276 return err;
2277}
2278
2279int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2280 struct group_filter __user *optval, int __user *optlen)
2281{
2282 int err, i, count, copycount;
2283 struct sockaddr_in *psin;
63007727 2284 __be32 addr;
1da177e4
LT		 2285 struct ip_mc_socklist *pmc;
2286 struct inet_sock *inet = inet_sk(sk);
2287 struct ip_sf_socklist *psl;
2288
2289 psin = (struct sockaddr_in *)&gsf->gf_group;
2290 if (psin->sin_family != AF_INET)
2291 return -EINVAL;
2292 addr = psin->sin_addr.s_addr;
f97c1e0c 2293 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2294 return -EINVAL;
2295
6756ae4b 2296 rtnl_lock();
1da177e4
LT		 2297
2298 err = -EADDRNOTAVAIL;
2299
1d7138de 2300 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2301 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2302 pmc->multi.imr_ifindex == gsf->gf_interface)
2303 break;
2304 }
2305 if (!pmc) /* must have a prior join */
2306 goto done;
2307 gsf->gf_fmode = pmc->sfmode;
1d7138de 2308 psl = rtnl_dereference(pmc->sflist);
6756ae4b 2309 rtnl_unlock();
1da177e4
LT		 2310 count = psl ? psl->sl_count : 0;
2311 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2312 gsf->gf_numsrc = count;
2313 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2314 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2315 return -EFAULT;
2316 }
c71151f0 2317 for (i = 0; i < copycount; i++) {
1da177e4
LT		 2318 struct sockaddr_storage ss;
2319
2320 psin = (struct sockaddr_in *)&ss;
2321 memset(&ss, 0, sizeof(ss));
2322 psin->sin_family = AF_INET;
2323 psin->sin_addr.s_addr = psl->sl_addr[i];
2324 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2325 return -EFAULT;
2326 }
2327 return 0;
2328done:
6756ae4b 2329 rtnl_unlock();
1da177e4
LT		 2330 return err;
2331}
2332
2333/*
2334 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2335 */
c0cda068 2336int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2337{
2338 struct inet_sock *inet = inet_sk(sk);
2339 struct ip_mc_socklist *pmc;
2340 struct ip_sf_socklist *psl;
2341 int i;
c85bb41e 2342 int ret;
1da177e4 2343
c85bb41e 2344 ret = 1;
f97c1e0c 2345 if (!ipv4_is_multicast(loc_addr))
c85bb41e 2346 goto out;
1da177e4 2347
c85bb41e 2348 rcu_read_lock();
1d7138de 2349 for_each_pmc_rcu(inet, pmc) {
1da177e4
LT		 2350 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2351 pmc->multi.imr_ifindex == dif)
2352 break;
2353 }
c85bb41e 2354 ret = inet->mc_all;
1da177e4 2355 if (!pmc)
c85bb41e 2356 goto unlock;
1d7138de 2357 psl = rcu_dereference(pmc->sflist);
c85bb41e 2358 ret = (pmc->sfmode == MCAST_EXCLUDE);
1da177e4 2359 if (!psl)
c85bb41e 2360 goto unlock;
1da177e4 2361
c71151f0 2362 for (i = 0; i < psl->sl_count; i++) {
1da177e4
LT		 2363 if (psl->sl_addr[i] == rmt_addr)
2364 break;
2365 }
c85bb41e 2366 ret = 0;
1da177e4 2367 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
c85bb41e 2368 goto unlock;
1da177e4 2369 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
c85bb41e
FL		 2370 goto unlock;
2371 ret = 1;
2372unlock:
2373 rcu_read_unlock();
2374out:
2375 return ret;
1da177e4
LT		 2376}
2377
2378/*
2379 * A socket is closing.
2380 */
2381
2382void ip_mc_drop_socket(struct sock *sk)
2383{
2384 struct inet_sock *inet = inet_sk(sk);
2385 struct ip_mc_socklist *iml;
877acedc 2386 struct net *net = sock_net(sk);
1da177e4
LT		 2387
2388 if (inet->mc_list == NULL)
2389 return;
2390
2391 rtnl_lock();
1d7138de 2392 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
1da177e4 2393 struct in_device *in_dev;
1da177e4 2394
1d7138de 2395 inet->mc_list = iml->next_rcu;
877acedc 2396 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
bb699cbc 2397 (void) ip_mc_leave_src(sk, iml, in_dev);
18943d29 2398 if (in_dev != NULL)
1da177e4 2399 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
c85bb41e
FL		 2400 /* decrease mem now to avoid the memleak warning */
2401 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
10d50e74 2402 kfree_rcu(iml, rcu);
1da177e4
LT		 2403 }
2404 rtnl_unlock();
2405}
2406
dbdd9a52
DM		 2407/* called with rcu_read_lock() */
2408int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2409{
2410 struct ip_mc_list *im;
e9897071 2411 struct ip_mc_list __rcu **mc_hash;
1da177e4
LT		 2412 struct ip_sf_list *psf;
2413 int rv = 0;
2414
e9897071
ED		 2415 mc_hash = rcu_dereference(in_dev->mc_hash);
2416 if (mc_hash) {
c70eba74 2417 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
e9897071
ED		 2418
2419 for (im = rcu_dereference(mc_hash[hash]);
2420 im != NULL;
2421 im = rcu_dereference(im->next_hash)) {
2422 if (im->multiaddr == mc_addr)
2423 break;
2424 }
2425 } else {
2426 for_each_pmc_rcu(in_dev, im) {
2427 if (im->multiaddr == mc_addr)
2428 break;
2429 }
1da177e4
LT		 2430 }
2431 if (im && proto == IPPROTO_IGMP) {
2432 rv = 1;
2433 } else if (im) {
2434 if (src_addr) {
c71151f0 2435 for (psf = im->sources; psf; psf = psf->sf_next) {
1da177e4
LT		 2436 if (psf->sf_inaddr == src_addr)
2437 break;
2438 }
2439 if (psf)
2440 rv = psf->sf_count[MCAST_INCLUDE] ||
2441 psf->sf_count[MCAST_EXCLUDE] !=
2442 im->sfcount[MCAST_EXCLUDE];
2443 else
2444 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2445 } else
2446 rv = 1; /* unspecified source; tentatively allow */
2447 }
1da177e4
LT		 2448 return rv;
2449}
2450
2451#if defined(CONFIG_PROC_FS)
2452struct igmp_mc_iter_state {
7091e728 2453 struct seq_net_private p;
1da177e4
LT		 2454 struct net_device *dev;
2455 struct in_device *in_dev;
2456};
2457
2458#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2459
2460static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2461{
7091e728 2462 struct net *net = seq_file_net(seq);
1da177e4
LT		 2463 struct ip_mc_list *im = NULL;
2464 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2465
7562f876 2466 state->in_dev = NULL;
61fbab77 2467 for_each_netdev_rcu(net, state->dev) {
1da177e4 2468 struct in_device *in_dev;
6baff150
ED		 2469
2470 in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2471 if (!in_dev)
2472 continue;
1d7138de 2473 im = rcu_dereference(in_dev->mc_list);
1da177e4
LT		 2474 if (im) {
2475 state->in_dev = in_dev;
2476 break;
2477 }
1da177e4
LT		 2478 }
2479 return im;
2480}
2481
2482static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2483{
2484 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
6baff150 2485
1d7138de
ED		 2486 im = rcu_dereference(im->next_rcu);
2487 while (!im) {
6baff150 2488 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2489 if (!state->dev) {
2490 state->in_dev = NULL;
2491 break;
2492 }
6baff150 2493 state->in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2494 if (!state->in_dev)
2495 continue;
1d7138de 2496 im = rcu_dereference(state->in_dev->mc_list);
1da177e4
LT		 2497 }
2498 return im;
2499}
2500
2501static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2502{
2503 struct ip_mc_list *im = igmp_mc_get_first(seq);
2504 if (im)
2505 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2506 --pos;
2507 return pos ? NULL : im;
2508}
2509
2510static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2511 __acquires(rcu)
1da177e4 2512{
61fbab77 2513 rcu_read_lock();
1da177e4
LT		 2514 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2515}
2516
2517static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2518{
2519 struct ip_mc_list *im;
2520 if (v == SEQ_START_TOKEN)
2521 im = igmp_mc_get_first(seq);
2522 else
2523 im = igmp_mc_get_next(seq, v);
2524 ++*pos;
2525 return im;
2526}
2527
2528static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
61fbab77 2529 __releases(rcu)
1da177e4
LT		 2530{
2531 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
1d7138de
ED		 2532
2533 state->in_dev = NULL;
1da177e4 2534 state->dev = NULL;
61fbab77 2535 rcu_read_unlock();
1da177e4
LT		 2536}
2537
2538static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2539{
2540 if (v == SEQ_START_TOKEN)
e905a9ed 2541 seq_puts(seq,
1da177e4
LT		 2542 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2543 else {
2544 struct ip_mc_list *im = (struct ip_mc_list *)v;
2545 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2546 char *querier;
a399a805
ED		 2547 long delta;
2548
1da177e4
LT		 2549#ifdef CONFIG_IP_MULTICAST
2550 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2551 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2552 "V3";
2553#else
2554 querier = "NONE";
2555#endif
2556
e6b68883 2557 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
1da177e4 2558 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
b8bae41e 2559 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
1da177e4
LT		 2560 }
2561
a399a805 2562 delta = im->timer.expires - jiffies;
1da177e4 2563 seq_printf(seq,
338fcf98 2564 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4 2565 im->multiaddr, im->users,
a399a805
ED		 2566 im->tm_running,
2567 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
1da177e4
LT		 2568 im->reporter);
2569 }
2570 return 0;
2571}
2572
f690808e 2573static const struct seq_operations igmp_mc_seq_ops = {
1da177e4
LT		 2574 .start = igmp_mc_seq_start,
2575 .next = igmp_mc_seq_next,
2576 .stop = igmp_mc_seq_stop,
2577 .show = igmp_mc_seq_show,
2578};
2579
2580static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2581{
7091e728 2582 return seq_open_net(inode, file, &igmp_mc_seq_ops,
cf7732e4 2583 sizeof(struct igmp_mc_iter_state));
1da177e4
LT		 2584}
2585
9a32144e 2586static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2587 .owner = THIS_MODULE,
2588 .open = igmp_mc_seq_open,
2589 .read = seq_read,
2590 .llseek = seq_lseek,
7091e728 2591 .release = seq_release_net,
1da177e4
LT		 2592};
2593
2594struct igmp_mcf_iter_state {
7091e728 2595 struct seq_net_private p;
1da177e4
LT		 2596 struct net_device *dev;
2597 struct in_device *idev;
2598 struct ip_mc_list *im;
2599};
2600
2601#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2602
2603static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2604{
7091e728 2605 struct net *net = seq_file_net(seq);
1da177e4
LT		 2606 struct ip_sf_list *psf = NULL;
2607 struct ip_mc_list *im = NULL;
2608 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2609
7562f876
PE		 2610 state->idev = NULL;
2611 state->im = NULL;
61fbab77 2612 for_each_netdev_rcu(net, state->dev) {
1da177e4 2613 struct in_device *idev;
6baff150 2614 idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2615 if (unlikely(idev == NULL))
2616 continue;
1d7138de 2617 im = rcu_dereference(idev->mc_list);
1da177e4
LT		 2618 if (likely(im != NULL)) {
2619 spin_lock_bh(&im->lock);
2620 psf = im->sources;
2621 if (likely(psf != NULL)) {
2622 state->im = im;
2623 state->idev = idev;
2624 break;
2625 }
2626 spin_unlock_bh(&im->lock);
2627 }
1da177e4
LT		 2628 }
2629 return psf;
2630}
2631
2632static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2633{
2634 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2635
2636 psf = psf->sf_next;
2637 while (!psf) {
2638 spin_unlock_bh(&state->im->lock);
2639 state->im = state->im->next;
2640 while (!state->im) {
6baff150 2641 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2642 if (!state->dev) {
2643 state->idev = NULL;
2644 goto out;
2645 }
6baff150 2646 state->idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2647 if (!state->idev)
2648 continue;
1d7138de 2649 state->im = rcu_dereference(state->idev->mc_list);
1da177e4
LT		 2650 }
2651 if (!state->im)
2652 break;
2653 spin_lock_bh(&state->im->lock);
2654 psf = state->im->sources;
2655 }
2656out:
2657 return psf;
2658}
2659
2660static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2661{
2662 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2663 if (psf)
2664 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2665 --pos;
2666 return pos ? NULL : psf;
2667}
2668
2669static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2670 __acquires(rcu)
1da177e4 2671{
61fbab77 2672 rcu_read_lock();
1da177e4
LT		 2673 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2674}
2675
2676static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2677{
2678 struct ip_sf_list *psf;
2679 if (v == SEQ_START_TOKEN)
2680 psf = igmp_mcf_get_first(seq);
2681 else
2682 psf = igmp_mcf_get_next(seq, v);
2683 ++*pos;
2684 return psf;
2685}
2686
2687static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
61fbab77 2688 __releases(rcu)
1da177e4
LT		 2689{
2690 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2691 if (likely(state->im != NULL)) {
2692 spin_unlock_bh(&state->im->lock);
2693 state->im = NULL;
2694 }
1d7138de 2695 state->idev = NULL;
1da177e4 2696 state->dev = NULL;
61fbab77 2697 rcu_read_unlock();
1da177e4
LT		 2698}
2699
2700static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2701{
2702 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2703 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2704
2705 if (v == SEQ_START_TOKEN) {
1744bea1 2706 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
1da177e4
LT		 2707 } else {
2708 seq_printf(seq,
2709 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2710 "0x%08x %6lu %6lu\n",
2711 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2712 ntohl(state->im->multiaddr),
2713 ntohl(psf->sf_inaddr),
2714 psf->sf_count[MCAST_INCLUDE],
2715 psf->sf_count[MCAST_EXCLUDE]);
2716 }
2717 return 0;
2718}
2719
f690808e 2720static const struct seq_operations igmp_mcf_seq_ops = {
1da177e4
LT		 2721 .start = igmp_mcf_seq_start,
2722 .next = igmp_mcf_seq_next,
2723 .stop = igmp_mcf_seq_stop,
2724 .show = igmp_mcf_seq_show,
2725};
2726
2727static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2728{
7091e728 2729 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
cf7732e4 2730 sizeof(struct igmp_mcf_iter_state));
1da177e4
LT		 2731}
2732
9a32144e 2733static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2734 .owner = THIS_MODULE,
2735 .open = igmp_mcf_seq_open,
2736 .read = seq_read,
2737 .llseek = seq_lseek,
7091e728 2738 .release = seq_release_net,
1da177e4
LT		 2739};
2740
2c8c1e72 2741static int __net_init igmp_net_init(struct net *net)
1da177e4 2742{
7091e728 2743 struct proc_dir_entry *pde;
93a714d6 2744 int err;
7091e728 2745
d4beaa66 2746 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
7091e728
AD		 2747 if (!pde)
2748 goto out_igmp;
d4beaa66
G		 2749 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2750 &igmp_mcf_seq_fops);
7091e728
AD		 2751 if (!pde)
2752 goto out_mcfilter;
93a714d6
MC		 2753 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2754 SOCK_DGRAM, 0, net);
2755 if (err < 0) {
2756 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2757 err);
2758 goto out_sock;
2759 }
2760
1da177e4 2761 return 0;
7091e728 2762
93a714d6
MC		 2763out_sock:
2764 remove_proc_entry("mcfilter", net->proc_net);
7091e728 2765out_mcfilter:
ece31ffd 2766 remove_proc_entry("igmp", net->proc_net);
7091e728
AD		 2767out_igmp:
2768 return -ENOMEM;
2769}
2770
2c8c1e72 2771static void __net_exit igmp_net_exit(struct net *net)
7091e728 2772{
ece31ffd
G		 2773 remove_proc_entry("mcfilter", net->proc_net);
2774 remove_proc_entry("igmp", net->proc_net);
93a714d6 2775 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
7091e728
AD		 2776}
2777
2778static struct pernet_operations igmp_net_ops = {
2779 .init = igmp_net_init,
2780 .exit = igmp_net_exit,
2781};
72c1d3bd 2782#endif
7091e728 2783
4aa5dee4
JP		 2784static int igmp_netdev_event(struct notifier_block *this,
2785 unsigned long event, void *ptr)
2786{
2787 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2788 struct in_device *in_dev;
2789
2790 switch (event) {
2791 case NETDEV_RESEND_IGMP:
2792 in_dev = __in_dev_get_rtnl(dev);
2793 if (in_dev)
2794 ip_mc_rejoin_groups(in_dev);
2795 break;
2796 default:
2797 break;
2798 }
2799 return NOTIFY_DONE;
2800}
2801
2802static struct notifier_block igmp_notifier = {
2803 .notifier_call = igmp_netdev_event,
2804};
2805
72c1d3bd 2806int __init igmp_mc_init(void)
7091e728 2807{
72c1d3bd 2808#if defined(CONFIG_PROC_FS)
4aa5dee4
JP		 2809 int err;
2810
2811 err = register_pernet_subsys(&igmp_net_ops);
2812 if (err)
2813 return err;
2814 err = register_netdevice_notifier(&igmp_notifier);
2815 if (err)
2816 goto reg_notif_fail;
2817 return 0;
2818
2819reg_notif_fail:
2820 unregister_pernet_subsys(&igmp_net_ops);
2821 return err;
72c1d3bd
WC		 2822#else
2823 return register_netdevice_notifier(&igmp_notifier);
1da177e4 2824#endif
72c1d3bd 2825}
Linux kernel - Deliverables
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