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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
LT		 75#include <asm/uaccess.h>
76#include <asm/system.h>
77#include <linux/types.h>
78#include <linux/kernel.h>
79#include <linux/jiffies.h>
80#include <linux/string.h>
81#include <linux/socket.h>
82#include <linux/sockios.h>
83#include <linux/in.h>
84#include <linux/inet.h>
85#include <linux/netdevice.h>
86#include <linux/skbuff.h>
87#include <linux/inetdevice.h>
88#include <linux/igmp.h>
89#include <linux/if_arp.h>
90#include <linux/rtnetlink.h>
91#include <linux/times.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)
117#define IGMP_Unsolicited_Report_Interval (10*HZ)
118#define IGMP_Query_Response_Interval (10*HZ)
119#define IGMP_Unsolicited_Report_Count 2
120
121
122#define IGMP_Initial_Report_Delay (1)
123
124/* IGMP_Initial_Report_Delay is not from IGMP specs!
125 * IGMP specs require to report membership immediately after
126 * joining a group, but we delay the first report by a
127 * small interval. It seems more natural and still does not
128 * contradict to specs provided this delay is small enough.
129 */
130
42f811b8 131#define IGMP_V1_SEEN(in_dev) \
c346dca1 132 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
42f811b8
HX		 133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
134 ((in_dev)->mr_v1_seen && \
135 time_before(jiffies, (in_dev)->mr_v1_seen)))
136#define IGMP_V2_SEEN(in_dev) \
c346dca1 137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
42f811b8
HX		 138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
139 ((in_dev)->mr_v2_seen && \
140 time_before(jiffies, (in_dev)->mr_v2_seen)))
1da177e4
LT		 141
142static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
63007727 143static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
1da177e4
LT		 144static void igmpv3_clear_delrec(struct in_device *in_dev);
145static int sf_setstate(struct ip_mc_list *pmc);
146static void sf_markstate(struct ip_mc_list *pmc);
147#endif
148static void ip_mc_clear_src(struct ip_mc_list *pmc);
8f935bbd
AV		 149static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
150 int sfcount, __be32 *psfsrc, int delta);
1da177e4 151
1d7138de
ED		 152
153static void ip_mc_list_reclaim(struct rcu_head *head)
154{
155 kfree(container_of(head, struct ip_mc_list, rcu));
156}
157
1da177e4
LT		 158static void ip_ma_put(struct ip_mc_list *im)
159{
160 if (atomic_dec_and_test(&im->refcnt)) {
161 in_dev_put(im->interface);
1d7138de 162 call_rcu(&im->rcu, ip_mc_list_reclaim);
1da177e4
LT		 163 }
164}
165
d9aa9380
DM		 166#define for_each_pmc_rcu(in_dev, pmc) \
167 for (pmc = rcu_dereference(in_dev->mc_list); \
168 pmc != NULL; \
169 pmc = rcu_dereference(pmc->next_rcu))
170
171#define for_each_pmc_rtnl(in_dev, pmc) \
172 for (pmc = rtnl_dereference(in_dev->mc_list); \
173 pmc != NULL; \
174 pmc = rtnl_dereference(pmc->next_rcu))
175
1da177e4
LT		 176#ifdef CONFIG_IP_MULTICAST
177
178/*
179 * Timer management
180 */
181
1d7138de 182static void igmp_stop_timer(struct ip_mc_list *im)
1da177e4
LT		 183{
184 spin_lock_bh(&im->lock);
185 if (del_timer(&im->timer))
186 atomic_dec(&im->refcnt);
a7e9ff73 187 im->tm_running = 0;
1da177e4
LT		 188 im->reporter = 0;
189 im->unsolicit_count = 0;
190 spin_unlock_bh(&im->lock);
191}
192
193/* It must be called with locked im->lock */
194static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
195{
a7e9ff73 196 int tv = net_random() % max_delay;
1da177e4 197
a7e9ff73 198 im->tm_running = 1;
1da177e4
LT		 199 if (!mod_timer(&im->timer, jiffies+tv+2))
200 atomic_inc(&im->refcnt);
201}
202
203static void igmp_gq_start_timer(struct in_device *in_dev)
204{
205 int tv = net_random() % in_dev->mr_maxdelay;
206
207 in_dev->mr_gq_running = 1;
208 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
209 in_dev_hold(in_dev);
210}
211
212static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
213{
214 int tv = net_random() % delay;
215
216 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
217 in_dev_hold(in_dev);
218}
219
220static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
221{
222 spin_lock_bh(&im->lock);
223 im->unsolicit_count = 0;
224 if (del_timer(&im->timer)) {
225 if ((long)(im->timer.expires-jiffies) < max_delay) {
226 add_timer(&im->timer);
a7e9ff73 227 im->tm_running = 1;
1da177e4
LT		 228 spin_unlock_bh(&im->lock);
229 return;
230 }
231 atomic_dec(&im->refcnt);
232 }
233 igmp_start_timer(im, max_delay);
234 spin_unlock_bh(&im->lock);
235}
236
237
238/*
239 * Send an IGMP report.
240 */
241
242#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
243
244
245static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
246 int gdeleted, int sdeleted)
247{
248 switch (type) {
249 case IGMPV3_MODE_IS_INCLUDE:
250 case IGMPV3_MODE_IS_EXCLUDE:
251 if (gdeleted || sdeleted)
252 return 0;
ad12583f
DS		 253 if (!(pmc->gsquery && !psf->sf_gsresp)) {
254 if (pmc->sfmode == MCAST_INCLUDE)
255 return 1;
256 /* don't include if this source is excluded
257 * in all filters
258 */
259 if (psf->sf_count[MCAST_INCLUDE])
260 return type == IGMPV3_MODE_IS_INCLUDE;
261 return pmc->sfcount[MCAST_EXCLUDE] ==
262 psf->sf_count[MCAST_EXCLUDE];
263 }
264 return 0;
1da177e4
LT		 265 case IGMPV3_CHANGE_TO_INCLUDE:
266 if (gdeleted || sdeleted)
267 return 0;
268 return psf->sf_count[MCAST_INCLUDE] != 0;
269 case IGMPV3_CHANGE_TO_EXCLUDE:
270 if (gdeleted || sdeleted)
271 return 0;
272 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
273 psf->sf_count[MCAST_INCLUDE])
274 return 0;
275 return pmc->sfcount[MCAST_EXCLUDE] ==
276 psf->sf_count[MCAST_EXCLUDE];
277 case IGMPV3_ALLOW_NEW_SOURCES:
278 if (gdeleted || !psf->sf_crcount)
279 return 0;
280 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
281 case IGMPV3_BLOCK_OLD_SOURCES:
282 if (pmc->sfmode == MCAST_INCLUDE)
283 return gdeleted || (psf->sf_crcount && sdeleted);
284 return psf->sf_crcount && !gdeleted && !sdeleted;
285 }
286 return 0;
287}
288
289static int
290igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
291{
292 struct ip_sf_list *psf;
293 int scount = 0;
294
295 for (psf=pmc->sources; psf; psf=psf->sf_next) {
296 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
297 continue;
298 scount++;
299 }
300 return scount;
301}
302
303static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
304{
305 struct sk_buff *skb;
306 struct rtable *rt;
307 struct iphdr *pip;
308 struct igmpv3_report *pig;
877acedc 309 struct net *net = dev_net(dev);
1da177e4 310
f5184d26 311 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
1da177e4
LT		 312 if (skb == NULL)
313 return NULL;
314
315 {
316 struct flowi fl = { .oif = dev->ifindex,
5811662b 317 .fl4_dst = IGMPV3_ALL_MCR,
1da177e4 318 .proto = IPPROTO_IGMP };
877acedc 319 if (ip_route_output_key(net, &rt, &fl)) {
1da177e4
LT		 320 kfree_skb(skb);
321 return NULL;
322 }
323 }
324 if (rt->rt_src == 0) {
325 kfree_skb(skb);
326 ip_rt_put(rt);
327 return NULL;
328 }
329
d8d1f30b 330 skb_dst_set(skb, &rt->dst);
1da177e4
LT		 331 skb->dev = dev;
332
333 skb_reserve(skb, LL_RESERVED_SPACE(dev));
334
7e28ecc2 335 skb_reset_network_header(skb);
eddc9ec5 336 pip = ip_hdr(skb);
7e28ecc2 337 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 338
339 pip->version = 4;
340 pip->ihl = (sizeof(struct iphdr)+4)>>2;
341 pip->tos = 0xc0;
342 pip->frag_off = htons(IP_DF);
343 pip->ttl = 1;
344 pip->daddr = rt->rt_dst;
345 pip->saddr = rt->rt_src;
346 pip->protocol = IPPROTO_IGMP;
347 pip->tot_len = 0; /* filled in later */
d8d1f30b 348 ip_select_ident(pip, &rt->dst, NULL);
1da177e4
LT		 349 ((u8*)&pip[1])[0] = IPOPT_RA;
350 ((u8*)&pip[1])[1] = 4;
351 ((u8*)&pip[1])[2] = 0;
352 ((u8*)&pip[1])[3] = 0;
353
b0e380b1 354 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
d10ba34b 355 skb_put(skb, sizeof(*pig));
d9edf9e2 356 pig = igmpv3_report_hdr(skb);
1da177e4
LT		 357 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
358 pig->resv1 = 0;
359 pig->csum = 0;
360 pig->resv2 = 0;
361 pig->ngrec = 0;
362 return skb;
363}
364
365static int igmpv3_sendpack(struct sk_buff *skb)
366{
d9edf9e2 367 struct igmphdr *pig = igmp_hdr(skb);
27a884dc 368 const int igmplen = skb->tail - skb->transport_header;
1da177e4 369
d9edf9e2 370 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
1da177e4 371
c439cb2e 372 return ip_local_out(skb);
1da177e4
LT		 373}
374
375static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
376{
a7e9ff73 377 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
1da177e4
LT		 378}
379
380static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
381 int type, struct igmpv3_grec **ppgr)
382{
383 struct net_device *dev = pmc->interface->dev;
384 struct igmpv3_report *pih;
385 struct igmpv3_grec *pgr;
386
387 if (!skb)
388 skb = igmpv3_newpack(dev, dev->mtu);
389 if (!skb)
390 return NULL;
391 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
392 pgr->grec_type = type;
393 pgr->grec_auxwords = 0;
394 pgr->grec_nsrcs = 0;
395 pgr->grec_mca = pmc->multiaddr;
d9edf9e2 396 pih = igmpv3_report_hdr(skb);
1da177e4
LT		 397 pih->ngrec = htons(ntohs(pih->ngrec)+1);
398 *ppgr = pgr;
399 return skb;
400}
401
402#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
403 skb_tailroom(skb)) : 0)
404
405static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
406 int type, int gdeleted, int sdeleted)
407{
408 struct net_device *dev = pmc->interface->dev;
409 struct igmpv3_report *pih;
410 struct igmpv3_grec *pgr = NULL;
411 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
ad12583f 412 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 413
414 if (pmc->multiaddr == IGMP_ALL_HOSTS)
415 return skb;
416
417 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
418 type == IGMPV3_MODE_IS_EXCLUDE;
419 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
420 type == IGMPV3_CHANGE_TO_EXCLUDE;
421
ad12583f
DS		 422 stotal = scount = 0;
423
1da177e4
LT		 424 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
425
ad12583f
DS		 426 if (!*psf_list)
427 goto empty_source;
428
d9edf9e2 429 pih = skb ? igmpv3_report_hdr(skb) : NULL;
1da177e4
LT		 430
431 /* EX and TO_EX get a fresh packet, if needed */
432 if (truncate) {
433 if (pih && pih->ngrec &&
434 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
435 if (skb)
436 igmpv3_sendpack(skb);
437 skb = igmpv3_newpack(dev, dev->mtu);
438 }
439 }
440 first = 1;
1da177e4
LT		 441 psf_prev = NULL;
442 for (psf=*psf_list; psf; psf=psf_next) {
ea4d9e72 443 __be32 *psrc;
1da177e4
LT		 444
445 psf_next = psf->sf_next;
446
447 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
448 psf_prev = psf;
449 continue;
450 }
451
452 /* clear marks on query responses */
453 if (isquery)
454 psf->sf_gsresp = 0;
455
63007727 456 if (AVAILABLE(skb) < sizeof(__be32) +
1da177e4
LT		 457 first*sizeof(struct igmpv3_grec)) {
458 if (truncate && !first)
459 break; /* truncate these */
460 if (pgr)
461 pgr->grec_nsrcs = htons(scount);
462 if (skb)
463 igmpv3_sendpack(skb);
464 skb = igmpv3_newpack(dev, dev->mtu);
465 first = 1;
466 scount = 0;
467 }
468 if (first) {
469 skb = add_grhead(skb, pmc, type, &pgr);
470 first = 0;
471 }
cc63f70b
AD		 472 if (!skb)
473 return NULL;
63007727 474 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
1da177e4 475 *psrc = psf->sf_inaddr;
ad12583f 476 scount++; stotal++;
1da177e4
LT		 477 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
478 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
479 psf->sf_crcount--;
480 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
481 if (psf_prev)
482 psf_prev->sf_next = psf->sf_next;
483 else
484 *psf_list = psf->sf_next;
485 kfree(psf);
486 continue;
487 }
488 }
489 psf_prev = psf;
490 }
ad12583f
DS		 491
492empty_source:
493 if (!stotal) {
494 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
495 type == IGMPV3_BLOCK_OLD_SOURCES)
496 return skb;
497 if (pmc->crcount || isquery) {
498 /* make sure we have room for group header */
499 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
500 igmpv3_sendpack(skb);
501 skb = NULL; /* add_grhead will get a new one */
502 }
503 skb = add_grhead(skb, pmc, type, &pgr);
504 }
505 }
1da177e4
LT		 506 if (pgr)
507 pgr->grec_nsrcs = htons(scount);
508
509 if (isquery)
510 pmc->gsquery = 0; /* clear query state on report */
511 return skb;
512}
513
514static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
515{
516 struct sk_buff *skb = NULL;
517 int type;
518
519 if (!pmc) {
1d7138de
ED		 520 rcu_read_lock();
521 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 522 if (pmc->multiaddr == IGMP_ALL_HOSTS)
523 continue;
524 spin_lock_bh(&pmc->lock);
525 if (pmc->sfcount[MCAST_EXCLUDE])
526 type = IGMPV3_MODE_IS_EXCLUDE;
527 else
528 type = IGMPV3_MODE_IS_INCLUDE;
529 skb = add_grec(skb, pmc, type, 0, 0);
530 spin_unlock_bh(&pmc->lock);
531 }
1d7138de 532 rcu_read_unlock();
1da177e4
LT		 533 } else {
534 spin_lock_bh(&pmc->lock);
535 if (pmc->sfcount[MCAST_EXCLUDE])
536 type = IGMPV3_MODE_IS_EXCLUDE;
537 else
538 type = IGMPV3_MODE_IS_INCLUDE;
539 skb = add_grec(skb, pmc, type, 0, 0);
540 spin_unlock_bh(&pmc->lock);
541 }
542 if (!skb)
543 return 0;
544 return igmpv3_sendpack(skb);
545}
546
547/*
548 * remove zero-count source records from a source filter list
549 */
550static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
551{
552 struct ip_sf_list *psf_prev, *psf_next, *psf;
553
554 psf_prev = NULL;
555 for (psf=*ppsf; psf; psf = psf_next) {
556 psf_next = psf->sf_next;
557 if (psf->sf_crcount == 0) {
558 if (psf_prev)
559 psf_prev->sf_next = psf->sf_next;
560 else
561 *ppsf = psf->sf_next;
562 kfree(psf);
563 } else
564 psf_prev = psf;
565 }
566}
567
568static void igmpv3_send_cr(struct in_device *in_dev)
569{
570 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
571 struct sk_buff *skb = NULL;
572 int type, dtype;
573
1d7138de 574 rcu_read_lock();
1da177e4
LT		 575 spin_lock_bh(&in_dev->mc_tomb_lock);
576
577 /* deleted MCA's */
578 pmc_prev = NULL;
579 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
580 pmc_next = pmc->next;
581 if (pmc->sfmode == MCAST_INCLUDE) {
582 type = IGMPV3_BLOCK_OLD_SOURCES;
583 dtype = IGMPV3_BLOCK_OLD_SOURCES;
584 skb = add_grec(skb, pmc, type, 1, 0);
585 skb = add_grec(skb, pmc, dtype, 1, 1);
586 }
587 if (pmc->crcount) {
1da177e4
LT		 588 if (pmc->sfmode == MCAST_EXCLUDE) {
589 type = IGMPV3_CHANGE_TO_INCLUDE;
590 skb = add_grec(skb, pmc, type, 1, 0);
591 }
ad12583f 592 pmc->crcount--;
1da177e4
LT		 593 if (pmc->crcount == 0) {
594 igmpv3_clear_zeros(&pmc->tomb);
595 igmpv3_clear_zeros(&pmc->sources);
596 }
597 }
598 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
599 if (pmc_prev)
600 pmc_prev->next = pmc_next;
601 else
602 in_dev->mc_tomb = pmc_next;
603 in_dev_put(pmc->interface);
604 kfree(pmc);
605 } else
606 pmc_prev = pmc;
607 }
608 spin_unlock_bh(&in_dev->mc_tomb_lock);
609
610 /* change recs */
1d7138de 611 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 612 spin_lock_bh(&pmc->lock);
613 if (pmc->sfcount[MCAST_EXCLUDE]) {
614 type = IGMPV3_BLOCK_OLD_SOURCES;
615 dtype = IGMPV3_ALLOW_NEW_SOURCES;
616 } else {
617 type = IGMPV3_ALLOW_NEW_SOURCES;
618 dtype = IGMPV3_BLOCK_OLD_SOURCES;
619 }
620 skb = add_grec(skb, pmc, type, 0, 0);
621 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
622
623 /* filter mode changes */
624 if (pmc->crcount) {
1da177e4
LT		 625 if (pmc->sfmode == MCAST_EXCLUDE)
626 type = IGMPV3_CHANGE_TO_EXCLUDE;
627 else
628 type = IGMPV3_CHANGE_TO_INCLUDE;
629 skb = add_grec(skb, pmc, type, 0, 0);
ad12583f 630 pmc->crcount--;
1da177e4
LT		 631 }
632 spin_unlock_bh(&pmc->lock);
633 }
1d7138de 634 rcu_read_unlock();
1da177e4
LT		 635
636 if (!skb)
637 return;
638 (void) igmpv3_sendpack(skb);
639}
640
641static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
642 int type)
643{
644 struct sk_buff *skb;
645 struct iphdr *iph;
646 struct igmphdr *ih;
647 struct rtable *rt;
648 struct net_device *dev = in_dev->dev;
877acedc 649 struct net *net = dev_net(dev);
63007727
AV		 650 __be32 group = pmc ? pmc->multiaddr : 0;
651 __be32 dst;
1da177e4
LT		 652
653 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
654 return igmpv3_send_report(in_dev, pmc);
655 else if (type == IGMP_HOST_LEAVE_MESSAGE)
656 dst = IGMP_ALL_ROUTER;
657 else
658 dst = group;
659
660 {
661 struct flowi fl = { .oif = dev->ifindex,
5811662b 662 .fl4_dst = dst,
1da177e4 663 .proto = IPPROTO_IGMP };
877acedc 664 if (ip_route_output_key(net, &rt, &fl))
1da177e4
LT		 665 return -1;
666 }
667 if (rt->rt_src == 0) {
668 ip_rt_put(rt);
669 return -1;
670 }
671
a7e9ff73 672 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
1da177e4
LT		 673 if (skb == NULL) {
674 ip_rt_put(rt);
675 return -1;
676 }
677
d8d1f30b 678 skb_dst_set(skb, &rt->dst);
1da177e4
LT		 679
680 skb_reserve(skb, LL_RESERVED_SPACE(dev));
681
7e28ecc2 682 skb_reset_network_header(skb);
eddc9ec5 683 iph = ip_hdr(skb);
7e28ecc2 684 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 685
686 iph->version = 4;
687 iph->ihl = (sizeof(struct iphdr)+4)>>2;
688 iph->tos = 0xc0;
689 iph->frag_off = htons(IP_DF);
690 iph->ttl = 1;
691 iph->daddr = dst;
692 iph->saddr = rt->rt_src;
693 iph->protocol = IPPROTO_IGMP;
d8d1f30b 694 ip_select_ident(iph, &rt->dst, NULL);
1da177e4
LT		 695 ((u8*)&iph[1])[0] = IPOPT_RA;
696 ((u8*)&iph[1])[1] = 4;
697 ((u8*)&iph[1])[2] = 0;
698 ((u8*)&iph[1])[3] = 0;
1da177e4
LT		 699
700 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
a7e9ff73
JK		 701 ih->type = type;
702 ih->code = 0;
703 ih->csum = 0;
704 ih->group = group;
705 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
1da177e4 706
c439cb2e 707 return ip_local_out(skb);
1da177e4
LT		 708}
709
710static void igmp_gq_timer_expire(unsigned long data)
711{
712 struct in_device *in_dev = (struct in_device *)data;
713
714 in_dev->mr_gq_running = 0;
715 igmpv3_send_report(in_dev, NULL);
716 __in_dev_put(in_dev);
717}
718
719static void igmp_ifc_timer_expire(unsigned long data)
720{
721 struct in_device *in_dev = (struct in_device *)data;
722
723 igmpv3_send_cr(in_dev);
724 if (in_dev->mr_ifc_count) {
725 in_dev->mr_ifc_count--;
726 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
727 }
728 __in_dev_put(in_dev);
729}
730
731static void igmp_ifc_event(struct in_device *in_dev)
732{
733 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
734 return;
e905a9ed 735 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 736 IGMP_Unsolicited_Report_Count;
737 igmp_ifc_start_timer(in_dev, 1);
738}
739
740
741static void igmp_timer_expire(unsigned long data)
742{
743 struct ip_mc_list *im=(struct ip_mc_list *)data;
744 struct in_device *in_dev = im->interface;
745
746 spin_lock(&im->lock);
a7e9ff73 747 im->tm_running = 0;
1da177e4
LT		 748
749 if (im->unsolicit_count) {
750 im->unsolicit_count--;
751 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
752 }
753 im->reporter = 1;
754 spin_unlock(&im->lock);
755
756 if (IGMP_V1_SEEN(in_dev))
757 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
758 else if (IGMP_V2_SEEN(in_dev))
759 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
760 else
761 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
762
763 ip_ma_put(im);
764}
765
ad12583f 766/* mark EXCLUDE-mode sources */
ea4d9e72 767static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 768{
769 struct ip_sf_list *psf;
770 int i, scount;
771
ad12583f
DS		 772 scount = 0;
773 for (psf=pmc->sources; psf; psf=psf->sf_next) {
774 if (scount == nsrcs)
775 break;
776 for (i=0; i<nsrcs; i++) {
777 /* skip inactive filters */
778 if (pmc->sfcount[MCAST_INCLUDE] ||
779 pmc->sfcount[MCAST_EXCLUDE] !=
780 psf->sf_count[MCAST_EXCLUDE])
781 continue;
782 if (srcs[i] == psf->sf_inaddr) {
783 scount++;
784 break;
785 }
786 }
787 }
788 pmc->gsquery = 0;
789 if (scount == nsrcs) /* all sources excluded */
790 return 0;
791 return 1;
792}
793
ea4d9e72 794static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 795{
796 struct ip_sf_list *psf;
797 int i, scount;
798
799 if (pmc->sfmode == MCAST_EXCLUDE)
800 return igmp_xmarksources(pmc, nsrcs, srcs);
801
802 /* mark INCLUDE-mode sources */
1da177e4
LT		 803 scount = 0;
804 for (psf=pmc->sources; psf; psf=psf->sf_next) {
805 if (scount == nsrcs)
806 break;
807 for (i=0; i<nsrcs; i++)
808 if (srcs[i] == psf->sf_inaddr) {
809 psf->sf_gsresp = 1;
810 scount++;
811 break;
812 }
813 }
ad12583f
DS		 814 if (!scount) {
815 pmc->gsquery = 0;
816 return 0;
817 }
818 pmc->gsquery = 1;
819 return 1;
1da177e4
LT		 820}
821
63007727 822static void igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 823{
824 struct ip_mc_list *im;
825
826 /* Timers are only set for non-local groups */
827
828 if (group == IGMP_ALL_HOSTS)
829 return;
830
1d7138de
ED		 831 rcu_read_lock();
832 for_each_pmc_rcu(in_dev, im) {
1da177e4
LT		 833 if (im->multiaddr == group) {
834 igmp_stop_timer(im);
835 break;
836 }
837 }
1d7138de 838 rcu_read_unlock();
1da177e4
LT		 839}
840
841static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
842 int len)
843{
d9edf9e2
ACM		 844 struct igmphdr *ih = igmp_hdr(skb);
845 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
1da177e4 846 struct ip_mc_list *im;
63007727 847 __be32 group = ih->group;
1da177e4
LT		 848 int max_delay;
849 int mark = 0;
850
851
5b7c8406 852 if (len == 8) {
1da177e4
LT		 853 if (ih->code == 0) {
854 /* Alas, old v1 router presents here. */
e905a9ed 855
1da177e4
LT		 856 max_delay = IGMP_Query_Response_Interval;
857 in_dev->mr_v1_seen = jiffies +
858 IGMP_V1_Router_Present_Timeout;
859 group = 0;
860 } else {
861 /* v2 router present */
862 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
863 in_dev->mr_v2_seen = jiffies +
864 IGMP_V2_Router_Present_Timeout;
865 }
866 /* cancel the interface change timer */
867 in_dev->mr_ifc_count = 0;
868 if (del_timer(&in_dev->mr_ifc_timer))
869 __in_dev_put(in_dev);
870 /* clear deleted report items */
871 igmpv3_clear_delrec(in_dev);
872 } else if (len < 12) {
873 return; /* ignore bogus packet; freed by caller */
5b7c8406
DS		 874 } else if (IGMP_V1_SEEN(in_dev)) {
875 /* This is a v3 query with v1 queriers present */
876 max_delay = IGMP_Query_Response_Interval;
877 group = 0;
878 } else if (IGMP_V2_SEEN(in_dev)) {
879 /* this is a v3 query with v2 queriers present;
880 * Interpretation of the max_delay code is problematic here.
881 * A real v2 host would use ih_code directly, while v3 has a
882 * different encoding. We use the v3 encoding as more likely
883 * to be intended in a v3 query.
884 */
885 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
1da177e4
LT		 886 } else { /* v3 */
887 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
888 return;
e905a9ed 889
d9edf9e2 890 ih3 = igmpv3_query_hdr(skb);
1da177e4 891 if (ih3->nsrcs) {
e905a9ed 892 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 893 + ntohs(ih3->nsrcs)*sizeof(__be32)))
1da177e4 894 return;
d9edf9e2 895 ih3 = igmpv3_query_hdr(skb);
1da177e4
LT		 896 }
897
898 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
899 if (!max_delay)
900 max_delay = 1; /* can't mod w/ 0 */
901 in_dev->mr_maxdelay = max_delay;
902 if (ih3->qrv)
903 in_dev->mr_qrv = ih3->qrv;
904 if (!group) { /* general query */
905 if (ih3->nsrcs)
906 return; /* no sources allowed */
907 igmp_gq_start_timer(in_dev);
908 return;
909 }
910 /* mark sources to include, if group & source-specific */
911 mark = ih3->nsrcs != 0;
912 }
913
914 /*
915 * - Start the timers in all of our membership records
916 * that the query applies to for the interface on
917 * which the query arrived excl. those that belong
918 * to a "local" group (224.0.0.X)
919 * - For timers already running check if they need to
920 * be reset.
921 * - Use the igmp->igmp_code field as the maximum
922 * delay possible
923 */
1d7138de
ED		 924 rcu_read_lock();
925 for_each_pmc_rcu(in_dev, im) {
ad12583f
DS		 926 int changed;
927
1da177e4
LT		 928 if (group && group != im->multiaddr)
929 continue;
930 if (im->multiaddr == IGMP_ALL_HOSTS)
931 continue;
932 spin_lock_bh(&im->lock);
933 if (im->tm_running)
934 im->gsquery = im->gsquery && mark;
935 else
936 im->gsquery = mark;
ad12583f 937 changed = !im->gsquery ||
e905a9ed 938 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 939 spin_unlock_bh(&im->lock);
ad12583f
DS		 940 if (changed)
941 igmp_mod_timer(im, max_delay);
1da177e4 942 }
1d7138de 943 rcu_read_unlock();
1da177e4
LT		 944}
945
9a57a9d2 946/* called in rcu_read_lock() section */
1da177e4
LT		 947int igmp_rcv(struct sk_buff *skb)
948{
949 /* This basically follows the spec line by line -- see RFC1112 */
950 struct igmphdr *ih;
9a57a9d2 951 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1da177e4
LT		 952 int len = skb->len;
953
cd557bc1
DL		 954 if (in_dev == NULL)
955 goto drop;
1da177e4 956
fb286bb2 957 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
9a57a9d2 958 goto drop;
fb286bb2
HX		 959
960 switch (skb->ip_summed) {
84fa7933 961 case CHECKSUM_COMPLETE:
d3bc23e7 962 if (!csum_fold(skb->csum))
fb286bb2
HX		 963 break;
964 /* fall through */
965 case CHECKSUM_NONE:
966 skb->csum = 0;
967 if (__skb_checksum_complete(skb))
9a57a9d2 968 goto drop;
1da177e4
LT		 969 }
970
d9edf9e2 971 ih = igmp_hdr(skb);
1da177e4
LT		 972 switch (ih->type) {
973 case IGMP_HOST_MEMBERSHIP_QUERY:
974 igmp_heard_query(in_dev, skb, len);
975 break;
976 case IGMP_HOST_MEMBERSHIP_REPORT:
977 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1da177e4 978 /* Is it our report looped back? */
c7537967 979 if (rt_is_output_route(skb_rtable(skb)))
1da177e4 980 break;
24c69275
DS		 981 /* don't rely on MC router hearing unicast reports */
982 if (skb->pkt_type == PACKET_MULTICAST ||
983 skb->pkt_type == PACKET_BROADCAST)
984 igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 985 break;
986 case IGMP_PIM:
987#ifdef CONFIG_IP_PIMSM_V1
1da177e4
LT		 988 return pim_rcv_v1(skb);
989#endif
c6b471e6 990 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1da177e4
LT		 991 case IGMP_DVMRP:
992 case IGMP_TRACE:
993 case IGMP_HOST_LEAVE_MESSAGE:
994 case IGMP_MTRACE:
995 case IGMP_MTRACE_RESP:
996 break;
997 default:
dd1c1853 998 break;
1da177e4 999 }
fb286bb2 1000
cd557bc1 1001drop:
1da177e4
LT		 1002 kfree_skb(skb);
1003 return 0;
1004}
1005
1006#endif
1007
1008
1009/*
1010 * Add a filter to a device
1011 */
1012
63007727 1013static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1014{
1015 char buf[MAX_ADDR_LEN];
1016 struct net_device *dev = in_dev->dev;
1017
1018 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1019 We will get multicast token leakage, when IFF_MULTICAST
1020 is changed. This check should be done in dev->set_multicast_list
1021 routine. Something sort of:
1022 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1023 --ANK
1024 */
1025 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1026 dev_mc_add(dev, buf);
1da177e4
LT		 1027}
1028
1029/*
1030 * Remove a filter from a device
1031 */
1032
63007727 1033static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1034{
1035 char buf[MAX_ADDR_LEN];
1036 struct net_device *dev = in_dev->dev;
1037
1038 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1039 dev_mc_del(dev, buf);
1da177e4
LT		 1040}
1041
1042#ifdef CONFIG_IP_MULTICAST
1043/*
1044 * deleted ip_mc_list manipulation
1045 */
1046static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1047{
1048 struct ip_mc_list *pmc;
1049
1050 /* this is an "ip_mc_list" for convenience; only the fields below
1051 * are actually used. In particular, the refcnt and users are not
1052 * used for management of the delete list. Using the same structure
1053 * for deleted items allows change reports to use common code with
1054 * non-deleted or query-response MCA's.
1055 */
0da974f4 1056 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1057 if (!pmc)
1058 return;
1da177e4
LT		 1059 spin_lock_bh(&im->lock);
1060 pmc->interface = im->interface;
1061 in_dev_hold(in_dev);
1062 pmc->multiaddr = im->multiaddr;
1063 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1064 IGMP_Unsolicited_Report_Count;
1065 pmc->sfmode = im->sfmode;
1066 if (pmc->sfmode == MCAST_INCLUDE) {
1067 struct ip_sf_list *psf;
1068
1069 pmc->tomb = im->tomb;
1070 pmc->sources = im->sources;
1071 im->tomb = im->sources = NULL;
1072 for (psf=pmc->sources; psf; psf=psf->sf_next)
1073 psf->sf_crcount = pmc->crcount;
1074 }
1075 spin_unlock_bh(&im->lock);
1076
1077 spin_lock_bh(&in_dev->mc_tomb_lock);
1078 pmc->next = in_dev->mc_tomb;
1079 in_dev->mc_tomb = pmc;
1080 spin_unlock_bh(&in_dev->mc_tomb_lock);
1081}
1082
63007727 1083static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1084{
1085 struct ip_mc_list *pmc, *pmc_prev;
1086 struct ip_sf_list *psf, *psf_next;
1087
1088 spin_lock_bh(&in_dev->mc_tomb_lock);
1089 pmc_prev = NULL;
1090 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1091 if (pmc->multiaddr == multiaddr)
1092 break;
1093 pmc_prev = pmc;
1094 }
1095 if (pmc) {
1096 if (pmc_prev)
1097 pmc_prev->next = pmc->next;
1098 else
1099 in_dev->mc_tomb = pmc->next;
1100 }
1101 spin_unlock_bh(&in_dev->mc_tomb_lock);
1102 if (pmc) {
1103 for (psf=pmc->tomb; psf; psf=psf_next) {
1104 psf_next = psf->sf_next;
1105 kfree(psf);
1106 }
1107 in_dev_put(pmc->interface);
1108 kfree(pmc);
1109 }
1110}
1111
1112static void igmpv3_clear_delrec(struct in_device *in_dev)
1113{
1114 struct ip_mc_list *pmc, *nextpmc;
1115
1116 spin_lock_bh(&in_dev->mc_tomb_lock);
1117 pmc = in_dev->mc_tomb;
1118 in_dev->mc_tomb = NULL;
1119 spin_unlock_bh(&in_dev->mc_tomb_lock);
1120
1121 for (; pmc; pmc = nextpmc) {
1122 nextpmc = pmc->next;
1123 ip_mc_clear_src(pmc);
1124 in_dev_put(pmc->interface);
1125 kfree(pmc);
1126 }
1127 /* clear dead sources, too */
1d7138de
ED		 1128 rcu_read_lock();
1129 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1130 struct ip_sf_list *psf, *psf_next;
1131
1132 spin_lock_bh(&pmc->lock);
1133 psf = pmc->tomb;
1134 pmc->tomb = NULL;
1135 spin_unlock_bh(&pmc->lock);
1136 for (; psf; psf=psf_next) {
1137 psf_next = psf->sf_next;
1138 kfree(psf);
1139 }
1140 }
1d7138de 1141 rcu_read_unlock();
1da177e4
LT		 1142}
1143#endif
1144
1145static void igmp_group_dropped(struct ip_mc_list *im)
1146{
1147 struct in_device *in_dev = im->interface;
1148#ifdef CONFIG_IP_MULTICAST
1149 int reporter;
1150#endif
1151
1152 if (im->loaded) {
1153 im->loaded = 0;
1154 ip_mc_filter_del(in_dev, im->multiaddr);
1155 }
1156
1157#ifdef CONFIG_IP_MULTICAST
1158 if (im->multiaddr == IGMP_ALL_HOSTS)
1159 return;
1160
1161 reporter = im->reporter;
1162 igmp_stop_timer(im);
1163
1164 if (!in_dev->dead) {
1165 if (IGMP_V1_SEEN(in_dev))
1166 goto done;
1167 if (IGMP_V2_SEEN(in_dev)) {
1168 if (reporter)
1169 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1170 goto done;
1171 }
1172 /* IGMPv3 */
1173 igmpv3_add_delrec(in_dev, im);
1174
1175 igmp_ifc_event(in_dev);
1176 }
1177done:
1178#endif
1179 ip_mc_clear_src(im);
1180}
1181
1182static void igmp_group_added(struct ip_mc_list *im)
1183{
1184 struct in_device *in_dev = im->interface;
1185
1186 if (im->loaded == 0) {
1187 im->loaded = 1;
1188 ip_mc_filter_add(in_dev, im->multiaddr);
1189 }
1190
1191#ifdef CONFIG_IP_MULTICAST
1192 if (im->multiaddr == IGMP_ALL_HOSTS)
1193 return;
1194
1195 if (in_dev->dead)
1196 return;
1197 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1198 spin_lock_bh(&im->lock);
1199 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1200 spin_unlock_bh(&im->lock);
1201 return;
1202 }
1203 /* else, v3 */
1204
1205 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1206 IGMP_Unsolicited_Report_Count;
1207 igmp_ifc_event(in_dev);
1208#endif
1209}
1210
1211
1212/*
1213 * Multicast list managers
1214 */
1215
1216
1217/*
1218 * A socket has joined a multicast group on device dev.
1219 */
1220
8f935bbd 1221void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1222{
1223 struct ip_mc_list *im;
1224
1225 ASSERT_RTNL();
1226
1d7138de 1227 for_each_pmc_rtnl(in_dev, im) {
1da177e4
LT		 1228 if (im->multiaddr == addr) {
1229 im->users++;
1230 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1231 goto out;
1232 }
1233 }
1234
1d7138de 1235 im = kzalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1236 if (!im)
1237 goto out;
1238
a7e9ff73
JK		 1239 im->users = 1;
1240 im->interface = in_dev;
1da177e4 1241 in_dev_hold(in_dev);
a7e9ff73 1242 im->multiaddr = addr;
1da177e4
LT		 1243 /* initial mode is (EX, empty) */
1244 im->sfmode = MCAST_EXCLUDE;
1da177e4 1245 im->sfcount[MCAST_EXCLUDE] = 1;
1da177e4
LT		 1246 atomic_set(&im->refcnt, 1);
1247 spin_lock_init(&im->lock);
1248#ifdef CONFIG_IP_MULTICAST
b24b8a24 1249 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1da177e4 1250 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1da177e4 1251#endif
1d7138de
ED		 1252
1253 im->next_rcu = in_dev->mc_list;
b8bae41e 1254 in_dev->mc_count++;
1d7138de
ED		 1255 rcu_assign_pointer(in_dev->mc_list, im);
1256
1da177e4
LT		 1257#ifdef CONFIG_IP_MULTICAST
1258 igmpv3_del_delrec(in_dev, im->multiaddr);
1259#endif
1260 igmp_group_added(im);
1261 if (!in_dev->dead)
1262 ip_rt_multicast_event(in_dev);
1263out:
1264 return;
1265}
4bc2f18b 1266EXPORT_SYMBOL(ip_mc_inc_group);
1da177e4 1267
a816c7c7
JV		 1268/*
1269 * Resend IGMP JOIN report; used for bonding.
1270 */
1271void ip_mc_rejoin_group(struct ip_mc_list *im)
1272{
08882669 1273#ifdef CONFIG_IP_MULTICAST
a816c7c7
JV		 1274 struct in_device *in_dev = im->interface;
1275
a816c7c7
JV		 1276 if (im->multiaddr == IGMP_ALL_HOSTS)
1277 return;
1278
e12b4539
FL		 1279 /* a failover is happening and switches
1280 * must be notified immediately */
1281 if (IGMP_V1_SEEN(in_dev))
1282 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
1283 else if (IGMP_V2_SEEN(in_dev))
1284 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
1285 else
1286 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
a816c7c7
JV		 1287#endif
1288}
4bc2f18b 1289EXPORT_SYMBOL(ip_mc_rejoin_group);
a816c7c7 1290
1da177e4
LT		 1291/*
1292 * A socket has left a multicast group on device dev
1293 */
1294
8f935bbd 1295void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1da177e4 1296{
1d7138de
ED		 1297 struct ip_mc_list *i;
1298 struct ip_mc_list __rcu **ip;
e905a9ed 1299
1da177e4 1300 ASSERT_RTNL();
e905a9ed 1301
1d7138de
ED		 1302 for (ip = &in_dev->mc_list;
1303 (i = rtnl_dereference(*ip)) != NULL;
1304 ip = &i->next_rcu) {
a7e9ff73 1305 if (i->multiaddr == addr) {
1da177e4 1306 if (--i->users == 0) {
1d7138de 1307 *ip = i->next_rcu;
b8bae41e 1308 in_dev->mc_count--;
1da177e4
LT		 1309 igmp_group_dropped(i);
1310
1311 if (!in_dev->dead)
1312 ip_rt_multicast_event(in_dev);
1313
1314 ip_ma_put(i);
1315 return;
1316 }
1317 break;
1318 }
1319 }
1320}
4bc2f18b 1321EXPORT_SYMBOL(ip_mc_dec_group);
1da177e4 1322
75c78500
MS		 1323/* Device changing type */
1324
1325void ip_mc_unmap(struct in_device *in_dev)
1326{
1d7138de 1327 struct ip_mc_list *pmc;
75c78500
MS		 1328
1329 ASSERT_RTNL();
1330
1d7138de
ED		 1331 for_each_pmc_rtnl(in_dev, pmc)
1332 igmp_group_dropped(pmc);
75c78500
MS		 1333}
1334
1335void ip_mc_remap(struct in_device *in_dev)
1336{
1d7138de 1337 struct ip_mc_list *pmc;
75c78500
MS		 1338
1339 ASSERT_RTNL();
1340
1d7138de
ED		 1341 for_each_pmc_rtnl(in_dev, pmc)
1342 igmp_group_added(pmc);
75c78500
MS		 1343}
1344
1da177e4
LT		 1345/* Device going down */
1346
1347void ip_mc_down(struct in_device *in_dev)
1348{
1d7138de 1349 struct ip_mc_list *pmc;
1da177e4
LT		 1350
1351 ASSERT_RTNL();
1352
1d7138de
ED		 1353 for_each_pmc_rtnl(in_dev, pmc)
1354 igmp_group_dropped(pmc);
1da177e4
LT		 1355
1356#ifdef CONFIG_IP_MULTICAST
1357 in_dev->mr_ifc_count = 0;
1358 if (del_timer(&in_dev->mr_ifc_timer))
1359 __in_dev_put(in_dev);
1360 in_dev->mr_gq_running = 0;
1361 if (del_timer(&in_dev->mr_gq_timer))
1362 __in_dev_put(in_dev);
1363 igmpv3_clear_delrec(in_dev);
1364#endif
1365
1366 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1367}
1368
1369void ip_mc_init_dev(struct in_device *in_dev)
1370{
1371 ASSERT_RTNL();
1372
1373 in_dev->mc_tomb = NULL;
1374#ifdef CONFIG_IP_MULTICAST
1375 in_dev->mr_gq_running = 0;
b24b8a24
PE		 1376 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1377 (unsigned long)in_dev);
1da177e4 1378 in_dev->mr_ifc_count = 0;
b8bae41e 1379 in_dev->mc_count = 0;
b24b8a24
PE		 1380 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1381 (unsigned long)in_dev);
1da177e4
LT		 1382 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1383#endif
1384
1da177e4
LT		 1385 spin_lock_init(&in_dev->mc_tomb_lock);
1386}
1387
1388/* Device going up */
1389
1390void ip_mc_up(struct in_device *in_dev)
1391{
1d7138de 1392 struct ip_mc_list *pmc;
1da177e4
LT		 1393
1394 ASSERT_RTNL();
1395
1396 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1397
1d7138de
ED		 1398 for_each_pmc_rtnl(in_dev, pmc)
1399 igmp_group_added(pmc);
1da177e4
LT		 1400}
1401
1402/*
1403 * Device is about to be destroyed: clean up.
1404 */
1405
1406void ip_mc_destroy_dev(struct in_device *in_dev)
1407{
1408 struct ip_mc_list *i;
1409
1410 ASSERT_RTNL();
1411
1412 /* Deactivate timers */
1413 ip_mc_down(in_dev);
1414
1d7138de
ED		 1415 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1416 in_dev->mc_list = i->next_rcu;
b8bae41e 1417 in_dev->mc_count--;
1d7138de 1418
1da177e4
LT		 1419 igmp_group_dropped(i);
1420 ip_ma_put(i);
1da177e4 1421 }
1da177e4
LT		 1422}
1423
9e917dca 1424/* RTNL is locked */
877acedc 1425static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1da177e4 1426{
5811662b 1427 struct flowi fl = { .fl4_dst = imr->imr_multiaddr.s_addr };
1da177e4
LT		 1428 struct rtable *rt;
1429 struct net_device *dev = NULL;
1430 struct in_device *idev = NULL;
1431
1432 if (imr->imr_ifindex) {
877acedc 1433 idev = inetdev_by_index(net, imr->imr_ifindex);
1da177e4
LT		 1434 return idev;
1435 }
1436 if (imr->imr_address.s_addr) {
9e917dca 1437 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1da177e4
LT		 1438 if (!dev)
1439 return NULL;
1da177e4
LT		 1440 }
1441
877acedc 1442 if (!dev && !ip_route_output_key(net, &rt, &fl)) {
d8d1f30b 1443 dev = rt->dst.dev;
1da177e4
LT		 1444 ip_rt_put(rt);
1445 }
1446 if (dev) {
1447 imr->imr_ifindex = dev->ifindex;
e5ed6399 1448 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1449 }
1450 return idev;
1451}
1452
1453/*
1454 * Join a socket to a group
1455 */
ab32ea5d
BH		 1456int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1457int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1da177e4
LT		 1458
1459
1460static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1461 __be32 *psfsrc)
1da177e4
LT		 1462{
1463 struct ip_sf_list *psf, *psf_prev;
1464 int rv = 0;
1465
1466 psf_prev = NULL;
1467 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1468 if (psf->sf_inaddr == *psfsrc)
1469 break;
1470 psf_prev = psf;
1471 }
1472 if (!psf || psf->sf_count[sfmode] == 0) {
1473 /* source filter not found, or count wrong => bug */
1474 return -ESRCH;
1475 }
1476 psf->sf_count[sfmode]--;
1477 if (psf->sf_count[sfmode] == 0) {
1478 ip_rt_multicast_event(pmc->interface);
1479 }
1480 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1481#ifdef CONFIG_IP_MULTICAST
1482 struct in_device *in_dev = pmc->interface;
1483#endif
1484
1485 /* no more filters for this source */
1486 if (psf_prev)
1487 psf_prev->sf_next = psf->sf_next;
1488 else
1489 pmc->sources = psf->sf_next;
1490#ifdef CONFIG_IP_MULTICAST
1491 if (psf->sf_oldin &&
1492 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
e905a9ed 1493 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1494 IGMP_Unsolicited_Report_Count;
1495 psf->sf_next = pmc->tomb;
1496 pmc->tomb = psf;
1497 rv = 1;
1498 } else
1499#endif
1500 kfree(psf);
1501 }
1502 return rv;
1503}
1504
1505#ifndef CONFIG_IP_MULTICAST
1506#define igmp_ifc_event(x) do { } while (0)
1507#endif
1508
8f935bbd
AV		 1509static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1510 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1511{
1512 struct ip_mc_list *pmc;
1513 int changerec = 0;
1514 int i, err;
1515
1516 if (!in_dev)
1517 return -ENODEV;
1d7138de
ED		 1518 rcu_read_lock();
1519 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1520 if (*pmca == pmc->multiaddr)
1521 break;
1522 }
1523 if (!pmc) {
1524 /* MCA not found?? bug */
1d7138de 1525 rcu_read_unlock();
1da177e4
LT		 1526 return -ESRCH;
1527 }
1528 spin_lock_bh(&pmc->lock);
1d7138de 1529 rcu_read_unlock();
1da177e4
LT		 1530#ifdef CONFIG_IP_MULTICAST
1531 sf_markstate(pmc);
1532#endif
1533 if (!delta) {
1534 err = -EINVAL;
1535 if (!pmc->sfcount[sfmode])
1536 goto out_unlock;
1537 pmc->sfcount[sfmode]--;
1538 }
1539 err = 0;
1540 for (i=0; i<sfcount; i++) {
1541 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1542
1543 changerec |= rv > 0;
1544 if (!err && rv < 0)
1545 err = rv;
1546 }
1547 if (pmc->sfmode == MCAST_EXCLUDE &&
1548 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1549 pmc->sfcount[MCAST_INCLUDE]) {
1550#ifdef CONFIG_IP_MULTICAST
1551 struct ip_sf_list *psf;
1552#endif
1553
1554 /* filter mode change */
1555 pmc->sfmode = MCAST_INCLUDE;
1556#ifdef CONFIG_IP_MULTICAST
e905a9ed 1557 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1558 IGMP_Unsolicited_Report_Count;
1559 in_dev->mr_ifc_count = pmc->crcount;
1560 for (psf=pmc->sources; psf; psf = psf->sf_next)
1561 psf->sf_crcount = 0;
1562 igmp_ifc_event(pmc->interface);
1563 } else if (sf_setstate(pmc) || changerec) {
1564 igmp_ifc_event(pmc->interface);
1565#endif
1566 }
1567out_unlock:
1568 spin_unlock_bh(&pmc->lock);
1569 return err;
1570}
1571
1572/*
1573 * Add multicast single-source filter to the interface list
1574 */
1575static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1576 __be32 *psfsrc, int delta)
1da177e4
LT		 1577{
1578 struct ip_sf_list *psf, *psf_prev;
1579
1580 psf_prev = NULL;
1581 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1582 if (psf->sf_inaddr == *psfsrc)
1583 break;
1584 psf_prev = psf;
1585 }
1586 if (!psf) {
0da974f4 1587 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1588 if (!psf)
1589 return -ENOBUFS;
1da177e4
LT		 1590 psf->sf_inaddr = *psfsrc;
1591 if (psf_prev) {
1592 psf_prev->sf_next = psf;
1593 } else
1594 pmc->sources = psf;
1595 }
1596 psf->sf_count[sfmode]++;
1597 if (psf->sf_count[sfmode] == 1) {
1598 ip_rt_multicast_event(pmc->interface);
1599 }
1600 return 0;
1601}
1602
1603#ifdef CONFIG_IP_MULTICAST
1604static void sf_markstate(struct ip_mc_list *pmc)
1605{
1606 struct ip_sf_list *psf;
1607 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1608
1609 for (psf=pmc->sources; psf; psf=psf->sf_next)
1610 if (pmc->sfcount[MCAST_EXCLUDE]) {
1611 psf->sf_oldin = mca_xcount ==
1612 psf->sf_count[MCAST_EXCLUDE] &&
1613 !psf->sf_count[MCAST_INCLUDE];
1614 } else
1615 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1616}
1617
1618static int sf_setstate(struct ip_mc_list *pmc)
1619{
ad12583f 1620 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1621 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1622 int qrv = pmc->interface->mr_qrv;
1623 int new_in, rv;
1624
1625 rv = 0;
1626 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1627 if (pmc->sfcount[MCAST_EXCLUDE]) {
1628 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1629 !psf->sf_count[MCAST_INCLUDE];
1630 } else
1631 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1632 if (new_in) {
1633 if (!psf->sf_oldin) {
76edc605 1634 struct ip_sf_list *prev = NULL;
ad12583f
DS		 1635
1636 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1637 if (dpsf->sf_inaddr == psf->sf_inaddr)
1638 break;
1639 prev = dpsf;
1640 }
1641 if (dpsf) {
1642 if (prev)
1643 prev->sf_next = dpsf->sf_next;
1644 else
1645 pmc->tomb = dpsf->sf_next;
1646 kfree(dpsf);
1647 }
1648 psf->sf_crcount = qrv;
1649 rv++;
1650 }
1651 } else if (psf->sf_oldin) {
1652
1653 psf->sf_crcount = 0;
1654 /*
1655 * add or update "delete" records if an active filter
1656 * is now inactive
1657 */
1658 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1659 if (dpsf->sf_inaddr == psf->sf_inaddr)
1660 break;
1661 if (!dpsf) {
3ed37a6f 1662 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
ad12583f
DS		 1663 if (!dpsf)
1664 continue;
1665 *dpsf = *psf;
1666 /* pmc->lock held by callers */
1667 dpsf->sf_next = pmc->tomb;
1668 pmc->tomb = dpsf;
1669 }
1670 dpsf->sf_crcount = qrv;
1da177e4
LT		 1671 rv++;
1672 }
1673 }
1674 return rv;
1675}
1676#endif
1677
1678/*
1679 * Add multicast source filter list to the interface list
1680 */
8f935bbd
AV		 1681static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1682 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1683{
1684 struct ip_mc_list *pmc;
1685 int isexclude;
1686 int i, err;
1687
1688 if (!in_dev)
1689 return -ENODEV;
1d7138de
ED		 1690 rcu_read_lock();
1691 for_each_pmc_rcu(in_dev, pmc) {
1da177e4
LT		 1692 if (*pmca == pmc->multiaddr)
1693 break;
1694 }
1695 if (!pmc) {
1696 /* MCA not found?? bug */
1d7138de 1697 rcu_read_unlock();
1da177e4
LT		 1698 return -ESRCH;
1699 }
1700 spin_lock_bh(&pmc->lock);
1d7138de 1701 rcu_read_unlock();
1da177e4
LT		 1702
1703#ifdef CONFIG_IP_MULTICAST
1704 sf_markstate(pmc);
1705#endif
1706 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1707 if (!delta)
1708 pmc->sfcount[sfmode]++;
1709 err = 0;
1710 for (i=0; i<sfcount; i++) {
1711 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1712 if (err)
1713 break;
1714 }
1715 if (err) {
1716 int j;
1717
1718 pmc->sfcount[sfmode]--;
1719 for (j=0; j<i; j++)
1720 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1721 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1722#ifdef CONFIG_IP_MULTICAST
1da177e4 1723 struct ip_sf_list *psf;
cfcabdcc 1724 in_dev = pmc->interface;
1da177e4
LT		 1725#endif
1726
1727 /* filter mode change */
1728 if (pmc->sfcount[MCAST_EXCLUDE])
1729 pmc->sfmode = MCAST_EXCLUDE;
1730 else if (pmc->sfcount[MCAST_INCLUDE])
1731 pmc->sfmode = MCAST_INCLUDE;
1732#ifdef CONFIG_IP_MULTICAST
1733 /* else no filters; keep old mode for reports */
1734
e905a9ed 1735 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1736 IGMP_Unsolicited_Report_Count;
1737 in_dev->mr_ifc_count = pmc->crcount;
1738 for (psf=pmc->sources; psf; psf = psf->sf_next)
1739 psf->sf_crcount = 0;
1740 igmp_ifc_event(in_dev);
1741 } else if (sf_setstate(pmc)) {
1742 igmp_ifc_event(in_dev);
1743#endif
1744 }
1745 spin_unlock_bh(&pmc->lock);
1746 return err;
1747}
1748
1749static void ip_mc_clear_src(struct ip_mc_list *pmc)
1750{
1751 struct ip_sf_list *psf, *nextpsf;
1752
1753 for (psf=pmc->tomb; psf; psf=nextpsf) {
1754 nextpsf = psf->sf_next;
1755 kfree(psf);
1756 }
1757 pmc->tomb = NULL;
1758 for (psf=pmc->sources; psf; psf=nextpsf) {
1759 nextpsf = psf->sf_next;
1760 kfree(psf);
1761 }
1762 pmc->sources = NULL;
1763 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1764 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1765 pmc->sfcount[MCAST_EXCLUDE] = 1;
1766}
1767
1768
1769/*
1770 * Join a multicast group
1771 */
1772int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1773{
1774 int err;
8f935bbd 1775 __be32 addr = imr->imr_multiaddr.s_addr;
a7e9ff73 1776 struct ip_mc_socklist *iml = NULL, *i;
1da177e4
LT		 1777 struct in_device *in_dev;
1778 struct inet_sock *inet = inet_sk(sk);
877acedc 1779 struct net *net = sock_net(sk);
ca9b907d 1780 int ifindex;
1da177e4
LT		 1781 int count = 0;
1782
f97c1e0c 1783 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1784 return -EINVAL;
1785
6756ae4b 1786 rtnl_lock();
1da177e4 1787
877acedc 1788 in_dev = ip_mc_find_dev(net, imr);
1da177e4
LT		 1789
1790 if (!in_dev) {
1791 iml = NULL;
1792 err = -ENODEV;
1793 goto done;
1794 }
1795
1da177e4 1796 err = -EADDRINUSE;
ca9b907d 1797 ifindex = imr->imr_ifindex;
1d7138de 1798 for_each_pmc_rtnl(inet, i) {
ca9b907d
DS		 1799 if (i->multi.imr_multiaddr.s_addr == addr &&
1800 i->multi.imr_ifindex == ifindex)
1da177e4 1801 goto done;
1da177e4
LT		 1802 count++;
1803 }
1804 err = -ENOBUFS;
ca9b907d
DS		 1805 if (count >= sysctl_igmp_max_memberships)
1806 goto done;
a7e9ff73 1807 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
ca9b907d 1808 if (iml == NULL)
1da177e4 1809 goto done;
ca9b907d 1810
1da177e4 1811 memcpy(&iml->multi, imr, sizeof(*imr));
1d7138de 1812 iml->next_rcu = inet->mc_list;
1da177e4
LT		 1813 iml->sflist = NULL;
1814 iml->sfmode = MCAST_EXCLUDE;
c85bb41e 1815 rcu_assign_pointer(inet->mc_list, iml);
1da177e4 1816 ip_mc_inc_group(in_dev, addr);
1da177e4 1817 err = 0;
1da177e4 1818done:
6756ae4b 1819 rtnl_unlock();
1da177e4
LT		 1820 return err;
1821}
4bc2f18b 1822EXPORT_SYMBOL(ip_mc_join_group);
1da177e4 1823
c85bb41e
FL		 1824static void ip_sf_socklist_reclaim(struct rcu_head *rp)
1825{
1d7138de 1826 kfree(container_of(rp, struct ip_sf_socklist, rcu));
c85bb41e 1827 /* sk_omem_alloc should have been decreased by the caller*/
c85bb41e
FL		 1828}
1829
1da177e4
LT		 1830static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1831 struct in_device *in_dev)
1832{
1d7138de 1833 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1da177e4
LT		 1834 int err;
1835
c85bb41e 1836 if (psf == NULL) {
1da177e4
LT		 1837 /* any-source empty exclude case */
1838 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1839 iml->sfmode, 0, NULL, 0);
1840 }
1841 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
c85bb41e
FL		 1842 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1843 rcu_assign_pointer(iml->sflist, NULL);
1844 /* decrease mem now to avoid the memleak warning */
1845 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1846 call_rcu(&psf->rcu, ip_sf_socklist_reclaim);
1da177e4
LT		 1847 return err;
1848}
1849
c85bb41e
FL		 1850
1851static void ip_mc_socklist_reclaim(struct rcu_head *rp)
1852{
1d7138de 1853 kfree(container_of(rp, struct ip_mc_socklist, rcu));
c85bb41e 1854 /* sk_omem_alloc should have been decreased by the caller*/
c85bb41e
FL		 1855}
1856
1857
1da177e4
LT		 1858/*
1859 * Ask a socket to leave a group.
1860 */
1861
1862int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1863{
1864 struct inet_sock *inet = inet_sk(sk);
1d7138de
ED		 1865 struct ip_mc_socklist *iml;
1866 struct ip_mc_socklist __rcu **imlp;
84b42bae 1867 struct in_device *in_dev;
877acedc 1868 struct net *net = sock_net(sk);
8f935bbd 1869 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1870 u32 ifindex;
acd6e00b 1871 int ret = -EADDRNOTAVAIL;
1da177e4
LT		 1872
1873 rtnl_lock();
877acedc 1874 in_dev = ip_mc_find_dev(net, imr);
84b42bae 1875 ifindex = imr->imr_ifindex;
1d7138de
ED		 1876 for (imlp = &inet->mc_list;
1877 (iml = rtnl_dereference(*imlp)) != NULL;
1878 imlp = &iml->next_rcu) {
acd6e00b
DS		 1879 if (iml->multi.imr_multiaddr.s_addr != group)
1880 continue;
1881 if (ifindex) {
1882 if (iml->multi.imr_ifindex != ifindex)
1883 continue;
1884 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1885 iml->multi.imr_address.s_addr)
1886 continue;
1da177e4 1887
acd6e00b 1888 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4 1889
1d7138de 1890 *imlp = iml->next_rcu;
acd6e00b
DS		 1891
1892 if (in_dev)
84b42bae 1893 ip_mc_dec_group(in_dev, group);
acd6e00b 1894 rtnl_unlock();
c85bb41e
FL		 1895 /* decrease mem now to avoid the memleak warning */
1896 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1897 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
acd6e00b 1898 return 0;
1da177e4 1899 }
acd6e00b
DS		 1900 if (!in_dev)
1901 ret = -ENODEV;
1da177e4 1902 rtnl_unlock();
acd6e00b 1903 return ret;
1da177e4
LT		 1904}
1905
1906int ip_mc_source(int add, int omode, struct sock *sk, struct
1907 ip_mreq_source *mreqs, int ifindex)
1908{
1909 int err;
1910 struct ip_mreqn imr;
63007727 1911 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 1912 struct ip_mc_socklist *pmc;
1913 struct in_device *in_dev = NULL;
1914 struct inet_sock *inet = inet_sk(sk);
1915 struct ip_sf_socklist *psl;
877acedc 1916 struct net *net = sock_net(sk);
8cdaaa15 1917 int leavegroup = 0;
1da177e4
LT		 1918 int i, j, rv;
1919
f97c1e0c 1920 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1921 return -EINVAL;
1922
6756ae4b 1923 rtnl_lock();
1da177e4
LT		 1924
1925 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1926 imr.imr_address.s_addr = mreqs->imr_interface;
1927 imr.imr_ifindex = ifindex;
877acedc 1928 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 1929
1930 if (!in_dev) {
1931 err = -ENODEV;
1932 goto done;
1933 }
1934 err = -EADDRNOTAVAIL;
1935
1d7138de 1936 for_each_pmc_rtnl(inet, pmc) {
f64f9e71
JP		 1937 if ((pmc->multi.imr_multiaddr.s_addr ==
1938 imr.imr_multiaddr.s_addr) &&
1939 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1da177e4
LT		 1940 break;
1941 }
917f2f10
DS		 1942 if (!pmc) { /* must have a prior join */
1943 err = -EINVAL;
1da177e4 1944 goto done;
917f2f10 1945 }
1da177e4
LT		 1946 /* if a source filter was set, must be the same mode as before */
1947 if (pmc->sflist) {
917f2f10
DS		 1948 if (pmc->sfmode != omode) {
1949 err = -EINVAL;
1da177e4 1950 goto done;
917f2f10 1951 }
1da177e4
LT		 1952 } else if (pmc->sfmode != omode) {
1953 /* allow mode switches for empty-set filters */
1954 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 1955 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 1956 NULL, 0);
1957 pmc->sfmode = omode;
1958 }
1959
1d7138de 1960 psl = rtnl_dereference(pmc->sflist);
1da177e4
LT		 1961 if (!add) {
1962 if (!psl)
917f2f10 1963 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1964 rv = !0;
1965 for (i=0; i<psl->sl_count; i++) {
1966 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1967 sizeof(__be32));
1da177e4
LT		 1968 if (rv == 0)
1969 break;
1970 }
1971 if (rv) /* source not found */
917f2f10 1972 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1973
8cdaaa15
DS		 1974 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1975 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1976 leavegroup = 1;
1977 goto done;
1978 }
1979
1da177e4 1980 /* update the interface filter */
e905a9ed 1981 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1982 &mreqs->imr_sourceaddr, 1);
1983
1984 for (j=i+1; j<psl->sl_count; j++)
1985 psl->sl_addr[j-1] = psl->sl_addr[j];
1986 psl->sl_count--;
1987 err = 0;
1988 goto done;
1989 }
1990 /* else, add a new source to the filter */
1991
1992 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1993 err = -ENOBUFS;
1994 goto done;
1995 }
1996 if (!psl || psl->sl_count == psl->sl_max) {
1997 struct ip_sf_socklist *newpsl;
1998 int count = IP_SFBLOCK;
1999
2000 if (psl)
2001 count += psl->sl_max;
8b3a7005 2002 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 2003 if (!newpsl) {
2004 err = -ENOBUFS;
2005 goto done;
2006 }
2007 newpsl->sl_max = count;
2008 newpsl->sl_count = count - IP_SFBLOCK;
2009 if (psl) {
2010 for (i=0; i<psl->sl_count; i++)
2011 newpsl->sl_addr[i] = psl->sl_addr[i];
c85bb41e
FL		 2012 /* decrease mem now to avoid the memleak warning */
2013 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2014 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
1da177e4 2015 }
c85bb41e
FL		 2016 rcu_assign_pointer(pmc->sflist, newpsl);
2017 psl = newpsl;
1da177e4
LT		 2018 }
2019 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2020 for (i=0; i<psl->sl_count; i++) {
2021 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 2022 sizeof(__be32));
1da177e4
LT		 2023 if (rv == 0)
2024 break;
2025 }
2026 if (rv == 0) /* address already there is an error */
2027 goto done;
2028 for (j=psl->sl_count-1; j>=i; j--)
2029 psl->sl_addr[j+1] = psl->sl_addr[j];
2030 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2031 psl->sl_count++;
2032 err = 0;
2033 /* update the interface list */
e905a9ed 2034 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 2035 &mreqs->imr_sourceaddr, 1);
2036done:
6756ae4b 2037 rtnl_unlock();
8cdaaa15
DS		 2038 if (leavegroup)
2039 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2040 return err;
2041}
2042
2043int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2044{
9951f036 2045 int err = 0;
1da177e4 2046 struct ip_mreqn imr;
63007727 2047 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2048 struct ip_mc_socklist *pmc;
2049 struct in_device *in_dev;
2050 struct inet_sock *inet = inet_sk(sk);
2051 struct ip_sf_socklist *newpsl, *psl;
877acedc 2052 struct net *net = sock_net(sk);
9951f036 2053 int leavegroup = 0;
1da177e4 2054
f97c1e0c 2055 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2056 return -EINVAL;
2057 if (msf->imsf_fmode != MCAST_INCLUDE &&
2058 msf->imsf_fmode != MCAST_EXCLUDE)
2059 return -EINVAL;
2060
6756ae4b 2061 rtnl_lock();
1da177e4
LT		 2062
2063 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2064 imr.imr_address.s_addr = msf->imsf_interface;
2065 imr.imr_ifindex = ifindex;
877acedc 2066 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2067
2068 if (!in_dev) {
2069 err = -ENODEV;
2070 goto done;
2071 }
1da177e4 2072
9951f036
DS		 2073 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2074 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2075 leavegroup = 1;
2076 goto done;
2077 }
2078
1d7138de 2079 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2080 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2081 pmc->multi.imr_ifindex == imr.imr_ifindex)
2082 break;
2083 }
917f2f10
DS		 2084 if (!pmc) { /* must have a prior join */
2085 err = -EINVAL;
1da177e4 2086 goto done;
917f2f10 2087 }
1da177e4 2088 if (msf->imsf_numsrc) {
8b3a7005
KK		 2089 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2090 GFP_KERNEL);
1da177e4
LT		 2091 if (!newpsl) {
2092 err = -ENOBUFS;
2093 goto done;
2094 }
2095 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2096 memcpy(newpsl->sl_addr, msf->imsf_slist,
2097 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2098 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2099 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2100 if (err) {
2101 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2102 goto done;
2103 }
8713dbf0 2104 } else {
1da177e4 2105 newpsl = NULL;
8713dbf0
YZ		 2106 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2107 msf->imsf_fmode, 0, NULL, 0);
2108 }
1d7138de 2109 psl = rtnl_dereference(pmc->sflist);
1da177e4
LT		 2110 if (psl) {
2111 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2112 psl->sl_count, psl->sl_addr, 0);
c85bb41e
FL		 2113 /* decrease mem now to avoid the memleak warning */
2114 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2115 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
1da177e4
LT		 2116 } else
2117 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2118 0, NULL, 0);
c85bb41e 2119 rcu_assign_pointer(pmc->sflist, newpsl);
1da177e4 2120 pmc->sfmode = msf->imsf_fmode;
917f2f10 2121 err = 0;
1da177e4 2122done:
6756ae4b 2123 rtnl_unlock();
9951f036
DS		 2124 if (leavegroup)
2125 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2126 return err;
2127}
2128
2129int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2130 struct ip_msfilter __user *optval, int __user *optlen)
2131{
2132 int err, len, count, copycount;
2133 struct ip_mreqn imr;
63007727 2134 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2135 struct ip_mc_socklist *pmc;
2136 struct in_device *in_dev;
2137 struct inet_sock *inet = inet_sk(sk);
2138 struct ip_sf_socklist *psl;
877acedc 2139 struct net *net = sock_net(sk);
1da177e4 2140
f97c1e0c 2141 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2142 return -EINVAL;
2143
6756ae4b 2144 rtnl_lock();
1da177e4
LT		 2145
2146 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2147 imr.imr_address.s_addr = msf->imsf_interface;
2148 imr.imr_ifindex = 0;
877acedc 2149 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2150
2151 if (!in_dev) {
2152 err = -ENODEV;
2153 goto done;
2154 }
2155 err = -EADDRNOTAVAIL;
2156
1d7138de 2157 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2158 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2159 pmc->multi.imr_ifindex == imr.imr_ifindex)
2160 break;
2161 }
2162 if (!pmc) /* must have a prior join */
2163 goto done;
2164 msf->imsf_fmode = pmc->sfmode;
1d7138de 2165 psl = rtnl_dereference(pmc->sflist);
6756ae4b 2166 rtnl_unlock();
1da177e4
LT		 2167 if (!psl) {
2168 len = 0;
2169 count = 0;
2170 } else {
2171 count = psl->sl_count;
2172 }
2173 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2174 len = copycount * sizeof(psl->sl_addr[0]);
2175 msf->imsf_numsrc = count;
2176 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2177 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2178 return -EFAULT;
2179 }
2180 if (len &&
2181 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2182 return -EFAULT;
2183 return 0;
2184done:
6756ae4b 2185 rtnl_unlock();
1da177e4
LT		 2186 return err;
2187}
2188
2189int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2190 struct group_filter __user *optval, int __user *optlen)
2191{
2192 int err, i, count, copycount;
2193 struct sockaddr_in *psin;
63007727 2194 __be32 addr;
1da177e4
LT		 2195 struct ip_mc_socklist *pmc;
2196 struct inet_sock *inet = inet_sk(sk);
2197 struct ip_sf_socklist *psl;
2198
2199 psin = (struct sockaddr_in *)&gsf->gf_group;
2200 if (psin->sin_family != AF_INET)
2201 return -EINVAL;
2202 addr = psin->sin_addr.s_addr;
f97c1e0c 2203 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2204 return -EINVAL;
2205
6756ae4b 2206 rtnl_lock();
1da177e4
LT		 2207
2208 err = -EADDRNOTAVAIL;
2209
1d7138de 2210 for_each_pmc_rtnl(inet, pmc) {
1da177e4
LT		 2211 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2212 pmc->multi.imr_ifindex == gsf->gf_interface)
2213 break;
2214 }
2215 if (!pmc) /* must have a prior join */
2216 goto done;
2217 gsf->gf_fmode = pmc->sfmode;
1d7138de 2218 psl = rtnl_dereference(pmc->sflist);
6756ae4b 2219 rtnl_unlock();
1da177e4
LT		 2220 count = psl ? psl->sl_count : 0;
2221 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2222 gsf->gf_numsrc = count;
2223 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2224 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2225 return -EFAULT;
2226 }
2227 for (i=0; i<copycount; i++) {
1da177e4
LT		 2228 struct sockaddr_storage ss;
2229
2230 psin = (struct sockaddr_in *)&ss;
2231 memset(&ss, 0, sizeof(ss));
2232 psin->sin_family = AF_INET;
2233 psin->sin_addr.s_addr = psl->sl_addr[i];
2234 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2235 return -EFAULT;
2236 }
2237 return 0;
2238done:
6756ae4b 2239 rtnl_unlock();
1da177e4
LT		 2240 return err;
2241}
2242
2243/*
2244 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2245 */
c0cda068 2246int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2247{
2248 struct inet_sock *inet = inet_sk(sk);
2249 struct ip_mc_socklist *pmc;
2250 struct ip_sf_socklist *psl;
2251 int i;
c85bb41e 2252 int ret;
1da177e4 2253
c85bb41e 2254 ret = 1;
f97c1e0c 2255 if (!ipv4_is_multicast(loc_addr))
c85bb41e 2256 goto out;
1da177e4 2257
c85bb41e 2258 rcu_read_lock();
1d7138de 2259 for_each_pmc_rcu(inet, pmc) {
1da177e4
LT		 2260 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2261 pmc->multi.imr_ifindex == dif)
2262 break;
2263 }
c85bb41e 2264 ret = inet->mc_all;
1da177e4 2265 if (!pmc)
c85bb41e 2266 goto unlock;
1d7138de 2267 psl = rcu_dereference(pmc->sflist);
c85bb41e 2268 ret = (pmc->sfmode == MCAST_EXCLUDE);
1da177e4 2269 if (!psl)
c85bb41e 2270 goto unlock;
1da177e4
LT		 2271
2272 for (i=0; i<psl->sl_count; i++) {
2273 if (psl->sl_addr[i] == rmt_addr)
2274 break;
2275 }
c85bb41e 2276 ret = 0;
1da177e4 2277 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
c85bb41e 2278 goto unlock;
1da177e4 2279 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
c85bb41e
FL		 2280 goto unlock;
2281 ret = 1;
2282unlock:
2283 rcu_read_unlock();
2284out:
2285 return ret;
1da177e4
LT		 2286}
2287
2288/*
2289 * A socket is closing.
2290 */
2291
2292void ip_mc_drop_socket(struct sock *sk)
2293{
2294 struct inet_sock *inet = inet_sk(sk);
2295 struct ip_mc_socklist *iml;
877acedc 2296 struct net *net = sock_net(sk);
1da177e4
LT		 2297
2298 if (inet->mc_list == NULL)
2299 return;
2300
2301 rtnl_lock();
1d7138de 2302 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
1da177e4 2303 struct in_device *in_dev;
1da177e4 2304
1d7138de 2305 inet->mc_list = iml->next_rcu;
877acedc 2306 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
bb699cbc 2307 (void) ip_mc_leave_src(sk, iml, in_dev);
18943d29 2308 if (in_dev != NULL)
1da177e4 2309 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
c85bb41e
FL		 2310 /* decrease mem now to avoid the memleak warning */
2311 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2312 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
1da177e4
LT		 2313 }
2314 rtnl_unlock();
2315}
2316
a60c4923 2317int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2318{
2319 struct ip_mc_list *im;
2320 struct ip_sf_list *psf;
2321 int rv = 0;
2322
1d7138de
ED		 2323 rcu_read_lock();
2324 for_each_pmc_rcu(in_dev, im) {
1da177e4
LT		 2325 if (im->multiaddr == mc_addr)
2326 break;
2327 }
2328 if (im && proto == IPPROTO_IGMP) {
2329 rv = 1;
2330 } else if (im) {
2331 if (src_addr) {
2332 for (psf=im->sources; psf; psf=psf->sf_next) {
2333 if (psf->sf_inaddr == src_addr)
2334 break;
2335 }
2336 if (psf)
2337 rv = psf->sf_count[MCAST_INCLUDE] ||
2338 psf->sf_count[MCAST_EXCLUDE] !=
2339 im->sfcount[MCAST_EXCLUDE];
2340 else
2341 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2342 } else
2343 rv = 1; /* unspecified source; tentatively allow */
2344 }
1d7138de 2345 rcu_read_unlock();
1da177e4
LT		 2346 return rv;
2347}
2348
2349#if defined(CONFIG_PROC_FS)
2350struct igmp_mc_iter_state {
7091e728 2351 struct seq_net_private p;
1da177e4
LT		 2352 struct net_device *dev;
2353 struct in_device *in_dev;
2354};
2355
2356#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2357
2358static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2359{
7091e728 2360 struct net *net = seq_file_net(seq);
1da177e4
LT		 2361 struct ip_mc_list *im = NULL;
2362 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2363
7562f876 2364 state->in_dev = NULL;
61fbab77 2365 for_each_netdev_rcu(net, state->dev) {
1da177e4 2366 struct in_device *in_dev;
6baff150
ED		 2367
2368 in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2369 if (!in_dev)
2370 continue;
1d7138de 2371 im = rcu_dereference(in_dev->mc_list);
1da177e4
LT		 2372 if (im) {
2373 state->in_dev = in_dev;
2374 break;
2375 }
1da177e4
LT		 2376 }
2377 return im;
2378}
2379
2380static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2381{
2382 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
6baff150 2383
1d7138de
ED		 2384 im = rcu_dereference(im->next_rcu);
2385 while (!im) {
6baff150 2386 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2387 if (!state->dev) {
2388 state->in_dev = NULL;
2389 break;
2390 }
6baff150 2391 state->in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2392 if (!state->in_dev)
2393 continue;
1d7138de 2394 im = rcu_dereference(state->in_dev->mc_list);
1da177e4
LT		 2395 }
2396 return im;
2397}
2398
2399static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2400{
2401 struct ip_mc_list *im = igmp_mc_get_first(seq);
2402 if (im)
2403 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2404 --pos;
2405 return pos ? NULL : im;
2406}
2407
2408static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2409 __acquires(rcu)
1da177e4 2410{
61fbab77 2411 rcu_read_lock();
1da177e4
LT		 2412 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2413}
2414
2415static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2416{
2417 struct ip_mc_list *im;
2418 if (v == SEQ_START_TOKEN)
2419 im = igmp_mc_get_first(seq);
2420 else
2421 im = igmp_mc_get_next(seq, v);
2422 ++*pos;
2423 return im;
2424}
2425
2426static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
61fbab77 2427 __releases(rcu)
1da177e4
LT		 2428{
2429 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
1d7138de
ED		 2430
2431 state->in_dev = NULL;
1da177e4 2432 state->dev = NULL;
61fbab77 2433 rcu_read_unlock();
1da177e4
LT		 2434}
2435
2436static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2437{
2438 if (v == SEQ_START_TOKEN)
e905a9ed 2439 seq_puts(seq,
1da177e4
LT		 2440 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2441 else {
2442 struct ip_mc_list *im = (struct ip_mc_list *)v;
2443 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2444 char *querier;
2445#ifdef CONFIG_IP_MULTICAST
2446 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2447 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2448 "V3";
2449#else
2450 querier = "NONE";
2451#endif
2452
1d7138de 2453 if (rcu_dereference(state->in_dev->mc_list) == im) {
1da177e4 2454 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
b8bae41e 2455 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
1da177e4
LT		 2456 }
2457
2458 seq_printf(seq,
338fcf98 2459 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4
LT		 2460 im->multiaddr, im->users,
2461 im->tm_running, im->tm_running ?
2462 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2463 im->reporter);
2464 }
2465 return 0;
2466}
2467
f690808e 2468static const struct seq_operations igmp_mc_seq_ops = {
1da177e4
LT		 2469 .start = igmp_mc_seq_start,
2470 .next = igmp_mc_seq_next,
2471 .stop = igmp_mc_seq_stop,
2472 .show = igmp_mc_seq_show,
2473};
2474
2475static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2476{
7091e728 2477 return seq_open_net(inode, file, &igmp_mc_seq_ops,
cf7732e4 2478 sizeof(struct igmp_mc_iter_state));
1da177e4
LT		 2479}
2480
9a32144e 2481static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2482 .owner = THIS_MODULE,
2483 .open = igmp_mc_seq_open,
2484 .read = seq_read,
2485 .llseek = seq_lseek,
7091e728 2486 .release = seq_release_net,
1da177e4
LT		 2487};
2488
2489struct igmp_mcf_iter_state {
7091e728 2490 struct seq_net_private p;
1da177e4
LT		 2491 struct net_device *dev;
2492 struct in_device *idev;
2493 struct ip_mc_list *im;
2494};
2495
2496#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2497
2498static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2499{
7091e728 2500 struct net *net = seq_file_net(seq);
1da177e4
LT		 2501 struct ip_sf_list *psf = NULL;
2502 struct ip_mc_list *im = NULL;
2503 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2504
7562f876
PE		 2505 state->idev = NULL;
2506 state->im = NULL;
61fbab77 2507 for_each_netdev_rcu(net, state->dev) {
1da177e4 2508 struct in_device *idev;
6baff150 2509 idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2510 if (unlikely(idev == NULL))
2511 continue;
1d7138de 2512 im = rcu_dereference(idev->mc_list);
1da177e4
LT		 2513 if (likely(im != NULL)) {
2514 spin_lock_bh(&im->lock);
2515 psf = im->sources;
2516 if (likely(psf != NULL)) {
2517 state->im = im;
2518 state->idev = idev;
2519 break;
2520 }
2521 spin_unlock_bh(&im->lock);
2522 }
1da177e4
LT		 2523 }
2524 return psf;
2525}
2526
2527static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2528{
2529 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2530
2531 psf = psf->sf_next;
2532 while (!psf) {
2533 spin_unlock_bh(&state->im->lock);
2534 state->im = state->im->next;
2535 while (!state->im) {
6baff150 2536 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2537 if (!state->dev) {
2538 state->idev = NULL;
2539 goto out;
2540 }
6baff150 2541 state->idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2542 if (!state->idev)
2543 continue;
1d7138de 2544 state->im = rcu_dereference(state->idev->mc_list);
1da177e4
LT		 2545 }
2546 if (!state->im)
2547 break;
2548 spin_lock_bh(&state->im->lock);
2549 psf = state->im->sources;
2550 }
2551out:
2552 return psf;
2553}
2554
2555static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2556{
2557 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2558 if (psf)
2559 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2560 --pos;
2561 return pos ? NULL : psf;
2562}
2563
2564static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2565 __acquires(rcu)
1da177e4 2566{
61fbab77 2567 rcu_read_lock();
1da177e4
LT		 2568 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2569}
2570
2571static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2572{
2573 struct ip_sf_list *psf;
2574 if (v == SEQ_START_TOKEN)
2575 psf = igmp_mcf_get_first(seq);
2576 else
2577 psf = igmp_mcf_get_next(seq, v);
2578 ++*pos;
2579 return psf;
2580}
2581
2582static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
61fbab77 2583 __releases(rcu)
1da177e4
LT		 2584{
2585 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2586 if (likely(state->im != NULL)) {
2587 spin_unlock_bh(&state->im->lock);
2588 state->im = NULL;
2589 }
1d7138de 2590 state->idev = NULL;
1da177e4 2591 state->dev = NULL;
61fbab77 2592 rcu_read_unlock();
1da177e4
LT		 2593}
2594
2595static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2596{
2597 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2598 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2599
2600 if (v == SEQ_START_TOKEN) {
e905a9ed 2601 seq_printf(seq,
1da177e4
LT		 2602 "%3s %6s "
2603 "%10s %10s %6s %6s\n", "Idx",
2604 "Device", "MCA",
2605 "SRC", "INC", "EXC");
2606 } else {
2607 seq_printf(seq,
2608 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2609 "0x%08x %6lu %6lu\n",
2610 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2611 ntohl(state->im->multiaddr),
2612 ntohl(psf->sf_inaddr),
2613 psf->sf_count[MCAST_INCLUDE],
2614 psf->sf_count[MCAST_EXCLUDE]);
2615 }
2616 return 0;
2617}
2618
f690808e 2619static const struct seq_operations igmp_mcf_seq_ops = {
1da177e4
LT		 2620 .start = igmp_mcf_seq_start,
2621 .next = igmp_mcf_seq_next,
2622 .stop = igmp_mcf_seq_stop,
2623 .show = igmp_mcf_seq_show,
2624};
2625
2626static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2627{
7091e728 2628 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
cf7732e4 2629 sizeof(struct igmp_mcf_iter_state));
1da177e4
LT		 2630}
2631
9a32144e 2632static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2633 .owner = THIS_MODULE,
2634 .open = igmp_mcf_seq_open,
2635 .read = seq_read,
2636 .llseek = seq_lseek,
7091e728 2637 .release = seq_release_net,
1da177e4
LT		 2638};
2639
2c8c1e72 2640static int __net_init igmp_net_init(struct net *net)
1da177e4 2641{
7091e728
AD		 2642 struct proc_dir_entry *pde;
2643
2644 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2645 if (!pde)
2646 goto out_igmp;
2647 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2648 if (!pde)
2649 goto out_mcfilter;
1da177e4 2650 return 0;
7091e728
AD		 2651
2652out_mcfilter:
2653 proc_net_remove(net, "igmp");
2654out_igmp:
2655 return -ENOMEM;
2656}
2657
2c8c1e72 2658static void __net_exit igmp_net_exit(struct net *net)
7091e728
AD		 2659{
2660 proc_net_remove(net, "mcfilter");
2661 proc_net_remove(net, "igmp");
2662}
2663
2664static struct pernet_operations igmp_net_ops = {
2665 .init = igmp_net_init,
2666 .exit = igmp_net_exit,
2667};
2668
2669int __init igmp_mc_proc_init(void)
2670{
2671 return register_pernet_subsys(&igmp_net_ops);
1da177e4
LT		 2672}
2673#endif
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