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Merge branch 'dccp' of git://eden-feed.erg.abdn.ac.uk/net-next-2.6
[net-next-2.6.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
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
LT		 151
152static void ip_ma_put(struct ip_mc_list *im)
153{
154 if (atomic_dec_and_test(&im->refcnt)) {
155 in_dev_put(im->interface);
156 kfree(im);
157 }
158}
159
160#ifdef CONFIG_IP_MULTICAST
161
162/*
163 * Timer management
164 */
165
166static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
167{
168 spin_lock_bh(&im->lock);
169 if (del_timer(&im->timer))
170 atomic_dec(&im->refcnt);
a7e9ff73 171 im->tm_running = 0;
1da177e4
LT		 172 im->reporter = 0;
173 im->unsolicit_count = 0;
174 spin_unlock_bh(&im->lock);
175}
176
177/* It must be called with locked im->lock */
178static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
179{
a7e9ff73 180 int tv = net_random() % max_delay;
1da177e4 181
a7e9ff73 182 im->tm_running = 1;
1da177e4
LT		 183 if (!mod_timer(&im->timer, jiffies+tv+2))
184 atomic_inc(&im->refcnt);
185}
186
187static void igmp_gq_start_timer(struct in_device *in_dev)
188{
189 int tv = net_random() % in_dev->mr_maxdelay;
190
191 in_dev->mr_gq_running = 1;
192 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
193 in_dev_hold(in_dev);
194}
195
196static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
197{
198 int tv = net_random() % delay;
199
200 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
201 in_dev_hold(in_dev);
202}
203
204static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
205{
206 spin_lock_bh(&im->lock);
207 im->unsolicit_count = 0;
208 if (del_timer(&im->timer)) {
209 if ((long)(im->timer.expires-jiffies) < max_delay) {
210 add_timer(&im->timer);
a7e9ff73 211 im->tm_running = 1;
1da177e4
LT		 212 spin_unlock_bh(&im->lock);
213 return;
214 }
215 atomic_dec(&im->refcnt);
216 }
217 igmp_start_timer(im, max_delay);
218 spin_unlock_bh(&im->lock);
219}
220
221
222/*
223 * Send an IGMP report.
224 */
225
226#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
227
228
229static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
230 int gdeleted, int sdeleted)
231{
232 switch (type) {
233 case IGMPV3_MODE_IS_INCLUDE:
234 case IGMPV3_MODE_IS_EXCLUDE:
235 if (gdeleted || sdeleted)
236 return 0;
ad12583f
DS		 237 if (!(pmc->gsquery && !psf->sf_gsresp)) {
238 if (pmc->sfmode == MCAST_INCLUDE)
239 return 1;
240 /* don't include if this source is excluded
241 * in all filters
242 */
243 if (psf->sf_count[MCAST_INCLUDE])
244 return type == IGMPV3_MODE_IS_INCLUDE;
245 return pmc->sfcount[MCAST_EXCLUDE] ==
246 psf->sf_count[MCAST_EXCLUDE];
247 }
248 return 0;
1da177e4
LT		 249 case IGMPV3_CHANGE_TO_INCLUDE:
250 if (gdeleted || sdeleted)
251 return 0;
252 return psf->sf_count[MCAST_INCLUDE] != 0;
253 case IGMPV3_CHANGE_TO_EXCLUDE:
254 if (gdeleted || sdeleted)
255 return 0;
256 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
257 psf->sf_count[MCAST_INCLUDE])
258 return 0;
259 return pmc->sfcount[MCAST_EXCLUDE] ==
260 psf->sf_count[MCAST_EXCLUDE];
261 case IGMPV3_ALLOW_NEW_SOURCES:
262 if (gdeleted || !psf->sf_crcount)
263 return 0;
264 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
265 case IGMPV3_BLOCK_OLD_SOURCES:
266 if (pmc->sfmode == MCAST_INCLUDE)
267 return gdeleted || (psf->sf_crcount && sdeleted);
268 return psf->sf_crcount && !gdeleted && !sdeleted;
269 }
270 return 0;
271}
272
273static int
274igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
275{
276 struct ip_sf_list *psf;
277 int scount = 0;
278
279 for (psf=pmc->sources; psf; psf=psf->sf_next) {
280 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
281 continue;
282 scount++;
283 }
284 return scount;
285}
286
287static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
288{
289 struct sk_buff *skb;
290 struct rtable *rt;
291 struct iphdr *pip;
292 struct igmpv3_report *pig;
877acedc 293 struct net *net = dev_net(dev);
1da177e4 294
f5184d26 295 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
1da177e4
LT		 296 if (skb == NULL)
297 return NULL;
298
299 {
300 struct flowi fl = { .oif = dev->ifindex,
301 .nl_u = { .ip4_u = {
302 .daddr = IGMPV3_ALL_MCR } },
303 .proto = IPPROTO_IGMP };
877acedc 304 if (ip_route_output_key(net, &rt, &fl)) {
1da177e4
LT		 305 kfree_skb(skb);
306 return NULL;
307 }
308 }
309 if (rt->rt_src == 0) {
310 kfree_skb(skb);
311 ip_rt_put(rt);
312 return NULL;
313 }
314
d8d1f30b 315 skb_dst_set(skb, &rt->dst);
1da177e4
LT		 316 skb->dev = dev;
317
318 skb_reserve(skb, LL_RESERVED_SPACE(dev));
319
7e28ecc2 320 skb_reset_network_header(skb);
eddc9ec5 321 pip = ip_hdr(skb);
7e28ecc2 322 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 323
324 pip->version = 4;
325 pip->ihl = (sizeof(struct iphdr)+4)>>2;
326 pip->tos = 0xc0;
327 pip->frag_off = htons(IP_DF);
328 pip->ttl = 1;
329 pip->daddr = rt->rt_dst;
330 pip->saddr = rt->rt_src;
331 pip->protocol = IPPROTO_IGMP;
332 pip->tot_len = 0; /* filled in later */
d8d1f30b 333 ip_select_ident(pip, &rt->dst, NULL);
1da177e4
LT		 334 ((u8*)&pip[1])[0] = IPOPT_RA;
335 ((u8*)&pip[1])[1] = 4;
336 ((u8*)&pip[1])[2] = 0;
337 ((u8*)&pip[1])[3] = 0;
338
b0e380b1 339 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
d10ba34b 340 skb_put(skb, sizeof(*pig));
d9edf9e2 341 pig = igmpv3_report_hdr(skb);
1da177e4
LT		 342 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
343 pig->resv1 = 0;
344 pig->csum = 0;
345 pig->resv2 = 0;
346 pig->ngrec = 0;
347 return skb;
348}
349
350static int igmpv3_sendpack(struct sk_buff *skb)
351{
d9edf9e2 352 struct igmphdr *pig = igmp_hdr(skb);
27a884dc 353 const int igmplen = skb->tail - skb->transport_header;
1da177e4 354
d9edf9e2 355 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
1da177e4 356
c439cb2e 357 return ip_local_out(skb);
1da177e4
LT		 358}
359
360static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
361{
a7e9ff73 362 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
1da177e4
LT		 363}
364
365static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
366 int type, struct igmpv3_grec **ppgr)
367{
368 struct net_device *dev = pmc->interface->dev;
369 struct igmpv3_report *pih;
370 struct igmpv3_grec *pgr;
371
372 if (!skb)
373 skb = igmpv3_newpack(dev, dev->mtu);
374 if (!skb)
375 return NULL;
376 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
377 pgr->grec_type = type;
378 pgr->grec_auxwords = 0;
379 pgr->grec_nsrcs = 0;
380 pgr->grec_mca = pmc->multiaddr;
d9edf9e2 381 pih = igmpv3_report_hdr(skb);
1da177e4
LT		 382 pih->ngrec = htons(ntohs(pih->ngrec)+1);
383 *ppgr = pgr;
384 return skb;
385}
386
387#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
388 skb_tailroom(skb)) : 0)
389
390static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
391 int type, int gdeleted, int sdeleted)
392{
393 struct net_device *dev = pmc->interface->dev;
394 struct igmpv3_report *pih;
395 struct igmpv3_grec *pgr = NULL;
396 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
ad12583f 397 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 398
399 if (pmc->multiaddr == IGMP_ALL_HOSTS)
400 return skb;
401
402 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
403 type == IGMPV3_MODE_IS_EXCLUDE;
404 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
405 type == IGMPV3_CHANGE_TO_EXCLUDE;
406
ad12583f
DS		 407 stotal = scount = 0;
408
1da177e4
LT		 409 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
410
ad12583f
DS		 411 if (!*psf_list)
412 goto empty_source;
413
d9edf9e2 414 pih = skb ? igmpv3_report_hdr(skb) : NULL;
1da177e4
LT		 415
416 /* EX and TO_EX get a fresh packet, if needed */
417 if (truncate) {
418 if (pih && pih->ngrec &&
419 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
420 if (skb)
421 igmpv3_sendpack(skb);
422 skb = igmpv3_newpack(dev, dev->mtu);
423 }
424 }
425 first = 1;
1da177e4
LT		 426 psf_prev = NULL;
427 for (psf=*psf_list; psf; psf=psf_next) {
ea4d9e72 428 __be32 *psrc;
1da177e4
LT		 429
430 psf_next = psf->sf_next;
431
432 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
433 psf_prev = psf;
434 continue;
435 }
436
437 /* clear marks on query responses */
438 if (isquery)
439 psf->sf_gsresp = 0;
440
63007727 441 if (AVAILABLE(skb) < sizeof(__be32) +
1da177e4
LT		 442 first*sizeof(struct igmpv3_grec)) {
443 if (truncate && !first)
444 break; /* truncate these */
445 if (pgr)
446 pgr->grec_nsrcs = htons(scount);
447 if (skb)
448 igmpv3_sendpack(skb);
449 skb = igmpv3_newpack(dev, dev->mtu);
450 first = 1;
451 scount = 0;
452 }
453 if (first) {
454 skb = add_grhead(skb, pmc, type, &pgr);
455 first = 0;
456 }
cc63f70b
AD		 457 if (!skb)
458 return NULL;
63007727 459 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
1da177e4 460 *psrc = psf->sf_inaddr;
ad12583f 461 scount++; stotal++;
1da177e4
LT		 462 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
463 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
464 psf->sf_crcount--;
465 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
466 if (psf_prev)
467 psf_prev->sf_next = psf->sf_next;
468 else
469 *psf_list = psf->sf_next;
470 kfree(psf);
471 continue;
472 }
473 }
474 psf_prev = psf;
475 }
ad12583f
DS		 476
477empty_source:
478 if (!stotal) {
479 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
480 type == IGMPV3_BLOCK_OLD_SOURCES)
481 return skb;
482 if (pmc->crcount || isquery) {
483 /* make sure we have room for group header */
484 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
485 igmpv3_sendpack(skb);
486 skb = NULL; /* add_grhead will get a new one */
487 }
488 skb = add_grhead(skb, pmc, type, &pgr);
489 }
490 }
1da177e4
LT		 491 if (pgr)
492 pgr->grec_nsrcs = htons(scount);
493
494 if (isquery)
495 pmc->gsquery = 0; /* clear query state on report */
496 return skb;
497}
498
499static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
500{
501 struct sk_buff *skb = NULL;
502 int type;
503
504 if (!pmc) {
505 read_lock(&in_dev->mc_list_lock);
506 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
507 if (pmc->multiaddr == IGMP_ALL_HOSTS)
508 continue;
509 spin_lock_bh(&pmc->lock);
510 if (pmc->sfcount[MCAST_EXCLUDE])
511 type = IGMPV3_MODE_IS_EXCLUDE;
512 else
513 type = IGMPV3_MODE_IS_INCLUDE;
514 skb = add_grec(skb, pmc, type, 0, 0);
515 spin_unlock_bh(&pmc->lock);
516 }
517 read_unlock(&in_dev->mc_list_lock);
518 } else {
519 spin_lock_bh(&pmc->lock);
520 if (pmc->sfcount[MCAST_EXCLUDE])
521 type = IGMPV3_MODE_IS_EXCLUDE;
522 else
523 type = IGMPV3_MODE_IS_INCLUDE;
524 skb = add_grec(skb, pmc, type, 0, 0);
525 spin_unlock_bh(&pmc->lock);
526 }
527 if (!skb)
528 return 0;
529 return igmpv3_sendpack(skb);
530}
531
532/*
533 * remove zero-count source records from a source filter list
534 */
535static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
536{
537 struct ip_sf_list *psf_prev, *psf_next, *psf;
538
539 psf_prev = NULL;
540 for (psf=*ppsf; psf; psf = psf_next) {
541 psf_next = psf->sf_next;
542 if (psf->sf_crcount == 0) {
543 if (psf_prev)
544 psf_prev->sf_next = psf->sf_next;
545 else
546 *ppsf = psf->sf_next;
547 kfree(psf);
548 } else
549 psf_prev = psf;
550 }
551}
552
553static void igmpv3_send_cr(struct in_device *in_dev)
554{
555 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
556 struct sk_buff *skb = NULL;
557 int type, dtype;
558
559 read_lock(&in_dev->mc_list_lock);
560 spin_lock_bh(&in_dev->mc_tomb_lock);
561
562 /* deleted MCA's */
563 pmc_prev = NULL;
564 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
565 pmc_next = pmc->next;
566 if (pmc->sfmode == MCAST_INCLUDE) {
567 type = IGMPV3_BLOCK_OLD_SOURCES;
568 dtype = IGMPV3_BLOCK_OLD_SOURCES;
569 skb = add_grec(skb, pmc, type, 1, 0);
570 skb = add_grec(skb, pmc, dtype, 1, 1);
571 }
572 if (pmc->crcount) {
1da177e4
LT		 573 if (pmc->sfmode == MCAST_EXCLUDE) {
574 type = IGMPV3_CHANGE_TO_INCLUDE;
575 skb = add_grec(skb, pmc, type, 1, 0);
576 }
ad12583f 577 pmc->crcount--;
1da177e4
LT		 578 if (pmc->crcount == 0) {
579 igmpv3_clear_zeros(&pmc->tomb);
580 igmpv3_clear_zeros(&pmc->sources);
581 }
582 }
583 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
584 if (pmc_prev)
585 pmc_prev->next = pmc_next;
586 else
587 in_dev->mc_tomb = pmc_next;
588 in_dev_put(pmc->interface);
589 kfree(pmc);
590 } else
591 pmc_prev = pmc;
592 }
593 spin_unlock_bh(&in_dev->mc_tomb_lock);
594
595 /* change recs */
596 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
597 spin_lock_bh(&pmc->lock);
598 if (pmc->sfcount[MCAST_EXCLUDE]) {
599 type = IGMPV3_BLOCK_OLD_SOURCES;
600 dtype = IGMPV3_ALLOW_NEW_SOURCES;
601 } else {
602 type = IGMPV3_ALLOW_NEW_SOURCES;
603 dtype = IGMPV3_BLOCK_OLD_SOURCES;
604 }
605 skb = add_grec(skb, pmc, type, 0, 0);
606 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
607
608 /* filter mode changes */
609 if (pmc->crcount) {
1da177e4
LT		 610 if (pmc->sfmode == MCAST_EXCLUDE)
611 type = IGMPV3_CHANGE_TO_EXCLUDE;
612 else
613 type = IGMPV3_CHANGE_TO_INCLUDE;
614 skb = add_grec(skb, pmc, type, 0, 0);
ad12583f 615 pmc->crcount--;
1da177e4
LT		 616 }
617 spin_unlock_bh(&pmc->lock);
618 }
619 read_unlock(&in_dev->mc_list_lock);
620
621 if (!skb)
622 return;
623 (void) igmpv3_sendpack(skb);
624}
625
626static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
627 int type)
628{
629 struct sk_buff *skb;
630 struct iphdr *iph;
631 struct igmphdr *ih;
632 struct rtable *rt;
633 struct net_device *dev = in_dev->dev;
877acedc 634 struct net *net = dev_net(dev);
63007727
AV		 635 __be32 group = pmc ? pmc->multiaddr : 0;
636 __be32 dst;
1da177e4
LT		 637
638 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
639 return igmpv3_send_report(in_dev, pmc);
640 else if (type == IGMP_HOST_LEAVE_MESSAGE)
641 dst = IGMP_ALL_ROUTER;
642 else
643 dst = group;
644
645 {
646 struct flowi fl = { .oif = dev->ifindex,
647 .nl_u = { .ip4_u = { .daddr = dst } },
648 .proto = IPPROTO_IGMP };
877acedc 649 if (ip_route_output_key(net, &rt, &fl))
1da177e4
LT		 650 return -1;
651 }
652 if (rt->rt_src == 0) {
653 ip_rt_put(rt);
654 return -1;
655 }
656
a7e9ff73 657 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
1da177e4
LT		 658 if (skb == NULL) {
659 ip_rt_put(rt);
660 return -1;
661 }
662
d8d1f30b 663 skb_dst_set(skb, &rt->dst);
1da177e4
LT		 664
665 skb_reserve(skb, LL_RESERVED_SPACE(dev));
666
7e28ecc2 667 skb_reset_network_header(skb);
eddc9ec5 668 iph = ip_hdr(skb);
7e28ecc2 669 skb_put(skb, sizeof(struct iphdr) + 4);
1da177e4
LT		 670
671 iph->version = 4;
672 iph->ihl = (sizeof(struct iphdr)+4)>>2;
673 iph->tos = 0xc0;
674 iph->frag_off = htons(IP_DF);
675 iph->ttl = 1;
676 iph->daddr = dst;
677 iph->saddr = rt->rt_src;
678 iph->protocol = IPPROTO_IGMP;
d8d1f30b 679 ip_select_ident(iph, &rt->dst, NULL);
1da177e4
LT		 680 ((u8*)&iph[1])[0] = IPOPT_RA;
681 ((u8*)&iph[1])[1] = 4;
682 ((u8*)&iph[1])[2] = 0;
683 ((u8*)&iph[1])[3] = 0;
1da177e4
LT		 684
685 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
a7e9ff73
JK		 686 ih->type = type;
687 ih->code = 0;
688 ih->csum = 0;
689 ih->group = group;
690 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
1da177e4 691
c439cb2e 692 return ip_local_out(skb);
1da177e4
LT		 693}
694
695static void igmp_gq_timer_expire(unsigned long data)
696{
697 struct in_device *in_dev = (struct in_device *)data;
698
699 in_dev->mr_gq_running = 0;
700 igmpv3_send_report(in_dev, NULL);
701 __in_dev_put(in_dev);
702}
703
704static void igmp_ifc_timer_expire(unsigned long data)
705{
706 struct in_device *in_dev = (struct in_device *)data;
707
708 igmpv3_send_cr(in_dev);
709 if (in_dev->mr_ifc_count) {
710 in_dev->mr_ifc_count--;
711 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
712 }
713 __in_dev_put(in_dev);
714}
715
716static void igmp_ifc_event(struct in_device *in_dev)
717{
718 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
719 return;
e905a9ed 720 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 721 IGMP_Unsolicited_Report_Count;
722 igmp_ifc_start_timer(in_dev, 1);
723}
724
725
726static void igmp_timer_expire(unsigned long data)
727{
728 struct ip_mc_list *im=(struct ip_mc_list *)data;
729 struct in_device *in_dev = im->interface;
730
731 spin_lock(&im->lock);
a7e9ff73 732 im->tm_running = 0;
1da177e4
LT		 733
734 if (im->unsolicit_count) {
735 im->unsolicit_count--;
736 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
737 }
738 im->reporter = 1;
739 spin_unlock(&im->lock);
740
741 if (IGMP_V1_SEEN(in_dev))
742 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
743 else if (IGMP_V2_SEEN(in_dev))
744 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
745 else
746 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
747
748 ip_ma_put(im);
749}
750
ad12583f 751/* mark EXCLUDE-mode sources */
ea4d9e72 752static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
1da177e4
LT		 753{
754 struct ip_sf_list *psf;
755 int i, scount;
756
ad12583f
DS		 757 scount = 0;
758 for (psf=pmc->sources; psf; psf=psf->sf_next) {
759 if (scount == nsrcs)
760 break;
761 for (i=0; i<nsrcs; i++) {
762 /* skip inactive filters */
763 if (pmc->sfcount[MCAST_INCLUDE] ||
764 pmc->sfcount[MCAST_EXCLUDE] !=
765 psf->sf_count[MCAST_EXCLUDE])
766 continue;
767 if (srcs[i] == psf->sf_inaddr) {
768 scount++;
769 break;
770 }
771 }
772 }
773 pmc->gsquery = 0;
774 if (scount == nsrcs) /* all sources excluded */
775 return 0;
776 return 1;
777}
778
ea4d9e72 779static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
ad12583f
DS		 780{
781 struct ip_sf_list *psf;
782 int i, scount;
783
784 if (pmc->sfmode == MCAST_EXCLUDE)
785 return igmp_xmarksources(pmc, nsrcs, srcs);
786
787 /* mark INCLUDE-mode sources */
1da177e4
LT		 788 scount = 0;
789 for (psf=pmc->sources; psf; psf=psf->sf_next) {
790 if (scount == nsrcs)
791 break;
792 for (i=0; i<nsrcs; i++)
793 if (srcs[i] == psf->sf_inaddr) {
794 psf->sf_gsresp = 1;
795 scount++;
796 break;
797 }
798 }
ad12583f
DS		 799 if (!scount) {
800 pmc->gsquery = 0;
801 return 0;
802 }
803 pmc->gsquery = 1;
804 return 1;
1da177e4
LT		 805}
806
63007727 807static void igmp_heard_report(struct in_device *in_dev, __be32 group)
1da177e4
LT		 808{
809 struct ip_mc_list *im;
810
811 /* Timers are only set for non-local groups */
812
813 if (group == IGMP_ALL_HOSTS)
814 return;
815
816 read_lock(&in_dev->mc_list_lock);
817 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
818 if (im->multiaddr == group) {
819 igmp_stop_timer(im);
820 break;
821 }
822 }
823 read_unlock(&in_dev->mc_list_lock);
824}
825
826static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
827 int len)
828{
d9edf9e2
ACM		 829 struct igmphdr *ih = igmp_hdr(skb);
830 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
1da177e4 831 struct ip_mc_list *im;
63007727 832 __be32 group = ih->group;
1da177e4
LT		 833 int max_delay;
834 int mark = 0;
835
836
5b7c8406 837 if (len == 8) {
1da177e4
LT		 838 if (ih->code == 0) {
839 /* Alas, old v1 router presents here. */
e905a9ed 840
1da177e4
LT		 841 max_delay = IGMP_Query_Response_Interval;
842 in_dev->mr_v1_seen = jiffies +
843 IGMP_V1_Router_Present_Timeout;
844 group = 0;
845 } else {
846 /* v2 router present */
847 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
848 in_dev->mr_v2_seen = jiffies +
849 IGMP_V2_Router_Present_Timeout;
850 }
851 /* cancel the interface change timer */
852 in_dev->mr_ifc_count = 0;
853 if (del_timer(&in_dev->mr_ifc_timer))
854 __in_dev_put(in_dev);
855 /* clear deleted report items */
856 igmpv3_clear_delrec(in_dev);
857 } else if (len < 12) {
858 return; /* ignore bogus packet; freed by caller */
5b7c8406
DS		 859 } else if (IGMP_V1_SEEN(in_dev)) {
860 /* This is a v3 query with v1 queriers present */
861 max_delay = IGMP_Query_Response_Interval;
862 group = 0;
863 } else if (IGMP_V2_SEEN(in_dev)) {
864 /* this is a v3 query with v2 queriers present;
865 * Interpretation of the max_delay code is problematic here.
866 * A real v2 host would use ih_code directly, while v3 has a
867 * different encoding. We use the v3 encoding as more likely
868 * to be intended in a v3 query.
869 */
870 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
1da177e4
LT		 871 } else { /* v3 */
872 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
873 return;
e905a9ed 874
d9edf9e2 875 ih3 = igmpv3_query_hdr(skb);
1da177e4 876 if (ih3->nsrcs) {
e905a9ed 877 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
63007727 878 + ntohs(ih3->nsrcs)*sizeof(__be32)))
1da177e4 879 return;
d9edf9e2 880 ih3 = igmpv3_query_hdr(skb);
1da177e4
LT		 881 }
882
883 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
884 if (!max_delay)
885 max_delay = 1; /* can't mod w/ 0 */
886 in_dev->mr_maxdelay = max_delay;
887 if (ih3->qrv)
888 in_dev->mr_qrv = ih3->qrv;
889 if (!group) { /* general query */
890 if (ih3->nsrcs)
891 return; /* no sources allowed */
892 igmp_gq_start_timer(in_dev);
893 return;
894 }
895 /* mark sources to include, if group & source-specific */
896 mark = ih3->nsrcs != 0;
897 }
898
899 /*
900 * - Start the timers in all of our membership records
901 * that the query applies to for the interface on
902 * which the query arrived excl. those that belong
903 * to a "local" group (224.0.0.X)
904 * - For timers already running check if they need to
905 * be reset.
906 * - Use the igmp->igmp_code field as the maximum
907 * delay possible
908 */
909 read_lock(&in_dev->mc_list_lock);
910 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
ad12583f
DS		 911 int changed;
912
1da177e4
LT		 913 if (group && group != im->multiaddr)
914 continue;
915 if (im->multiaddr == IGMP_ALL_HOSTS)
916 continue;
917 spin_lock_bh(&im->lock);
918 if (im->tm_running)
919 im->gsquery = im->gsquery && mark;
920 else
921 im->gsquery = mark;
ad12583f 922 changed = !im->gsquery ||
e905a9ed 923 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1da177e4 924 spin_unlock_bh(&im->lock);
ad12583f
DS		 925 if (changed)
926 igmp_mod_timer(im, max_delay);
1da177e4
LT		 927 }
928 read_unlock(&in_dev->mc_list_lock);
929}
930
9a57a9d2 931/* called in rcu_read_lock() section */
1da177e4
LT		 932int igmp_rcv(struct sk_buff *skb)
933{
934 /* This basically follows the spec line by line -- see RFC1112 */
935 struct igmphdr *ih;
9a57a9d2 936 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1da177e4
LT		 937 int len = skb->len;
938
cd557bc1
DL		 939 if (in_dev == NULL)
940 goto drop;
1da177e4 941
fb286bb2 942 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
9a57a9d2 943 goto drop;
fb286bb2
HX		 944
945 switch (skb->ip_summed) {
84fa7933 946 case CHECKSUM_COMPLETE:
d3bc23e7 947 if (!csum_fold(skb->csum))
fb286bb2
HX		 948 break;
949 /* fall through */
950 case CHECKSUM_NONE:
951 skb->csum = 0;
952 if (__skb_checksum_complete(skb))
9a57a9d2 953 goto drop;
1da177e4
LT		 954 }
955
d9edf9e2 956 ih = igmp_hdr(skb);
1da177e4
LT		 957 switch (ih->type) {
958 case IGMP_HOST_MEMBERSHIP_QUERY:
959 igmp_heard_query(in_dev, skb, len);
960 break;
961 case IGMP_HOST_MEMBERSHIP_REPORT:
962 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1da177e4 963 /* Is it our report looped back? */
511c3f92 964 if (skb_rtable(skb)->fl.iif == 0)
1da177e4 965 break;
24c69275
DS		 966 /* don't rely on MC router hearing unicast reports */
967 if (skb->pkt_type == PACKET_MULTICAST ||
968 skb->pkt_type == PACKET_BROADCAST)
969 igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 970 break;
971 case IGMP_PIM:
972#ifdef CONFIG_IP_PIMSM_V1
1da177e4
LT		 973 return pim_rcv_v1(skb);
974#endif
c6b471e6 975 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1da177e4
LT		 976 case IGMP_DVMRP:
977 case IGMP_TRACE:
978 case IGMP_HOST_LEAVE_MESSAGE:
979 case IGMP_MTRACE:
980 case IGMP_MTRACE_RESP:
981 break;
982 default:
dd1c1853 983 break;
1da177e4 984 }
fb286bb2 985
cd557bc1 986drop:
1da177e4
LT		 987 kfree_skb(skb);
988 return 0;
989}
990
991#endif
992
993
994/*
995 * Add a filter to a device
996 */
997
63007727 998static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 999{
1000 char buf[MAX_ADDR_LEN];
1001 struct net_device *dev = in_dev->dev;
1002
1003 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1004 We will get multicast token leakage, when IFF_MULTICAST
1005 is changed. This check should be done in dev->set_multicast_list
1006 routine. Something sort of:
1007 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1008 --ANK
1009 */
1010 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1011 dev_mc_add(dev, buf);
1da177e4
LT		 1012}
1013
1014/*
1015 * Remove a filter from a device
1016 */
1017
63007727 1018static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1019{
1020 char buf[MAX_ADDR_LEN];
1021 struct net_device *dev = in_dev->dev;
1022
1023 if (arp_mc_map(addr, buf, dev, 0) == 0)
22bedad3 1024 dev_mc_del(dev, buf);
1da177e4
LT		 1025}
1026
1027#ifdef CONFIG_IP_MULTICAST
1028/*
1029 * deleted ip_mc_list manipulation
1030 */
1031static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1032{
1033 struct ip_mc_list *pmc;
1034
1035 /* this is an "ip_mc_list" for convenience; only the fields below
1036 * are actually used. In particular, the refcnt and users are not
1037 * used for management of the delete list. Using the same structure
1038 * for deleted items allows change reports to use common code with
1039 * non-deleted or query-response MCA's.
1040 */
0da974f4 1041 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1da177e4
LT		 1042 if (!pmc)
1043 return;
1da177e4
LT		 1044 spin_lock_bh(&im->lock);
1045 pmc->interface = im->interface;
1046 in_dev_hold(in_dev);
1047 pmc->multiaddr = im->multiaddr;
1048 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1049 IGMP_Unsolicited_Report_Count;
1050 pmc->sfmode = im->sfmode;
1051 if (pmc->sfmode == MCAST_INCLUDE) {
1052 struct ip_sf_list *psf;
1053
1054 pmc->tomb = im->tomb;
1055 pmc->sources = im->sources;
1056 im->tomb = im->sources = NULL;
1057 for (psf=pmc->sources; psf; psf=psf->sf_next)
1058 psf->sf_crcount = pmc->crcount;
1059 }
1060 spin_unlock_bh(&im->lock);
1061
1062 spin_lock_bh(&in_dev->mc_tomb_lock);
1063 pmc->next = in_dev->mc_tomb;
1064 in_dev->mc_tomb = pmc;
1065 spin_unlock_bh(&in_dev->mc_tomb_lock);
1066}
1067
63007727 1068static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1da177e4
LT		 1069{
1070 struct ip_mc_list *pmc, *pmc_prev;
1071 struct ip_sf_list *psf, *psf_next;
1072
1073 spin_lock_bh(&in_dev->mc_tomb_lock);
1074 pmc_prev = NULL;
1075 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1076 if (pmc->multiaddr == multiaddr)
1077 break;
1078 pmc_prev = pmc;
1079 }
1080 if (pmc) {
1081 if (pmc_prev)
1082 pmc_prev->next = pmc->next;
1083 else
1084 in_dev->mc_tomb = pmc->next;
1085 }
1086 spin_unlock_bh(&in_dev->mc_tomb_lock);
1087 if (pmc) {
1088 for (psf=pmc->tomb; psf; psf=psf_next) {
1089 psf_next = psf->sf_next;
1090 kfree(psf);
1091 }
1092 in_dev_put(pmc->interface);
1093 kfree(pmc);
1094 }
1095}
1096
1097static void igmpv3_clear_delrec(struct in_device *in_dev)
1098{
1099 struct ip_mc_list *pmc, *nextpmc;
1100
1101 spin_lock_bh(&in_dev->mc_tomb_lock);
1102 pmc = in_dev->mc_tomb;
1103 in_dev->mc_tomb = NULL;
1104 spin_unlock_bh(&in_dev->mc_tomb_lock);
1105
1106 for (; pmc; pmc = nextpmc) {
1107 nextpmc = pmc->next;
1108 ip_mc_clear_src(pmc);
1109 in_dev_put(pmc->interface);
1110 kfree(pmc);
1111 }
1112 /* clear dead sources, too */
1113 read_lock(&in_dev->mc_list_lock);
1114 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1115 struct ip_sf_list *psf, *psf_next;
1116
1117 spin_lock_bh(&pmc->lock);
1118 psf = pmc->tomb;
1119 pmc->tomb = NULL;
1120 spin_unlock_bh(&pmc->lock);
1121 for (; psf; psf=psf_next) {
1122 psf_next = psf->sf_next;
1123 kfree(psf);
1124 }
1125 }
1126 read_unlock(&in_dev->mc_list_lock);
1127}
1128#endif
1129
1130static void igmp_group_dropped(struct ip_mc_list *im)
1131{
1132 struct in_device *in_dev = im->interface;
1133#ifdef CONFIG_IP_MULTICAST
1134 int reporter;
1135#endif
1136
1137 if (im->loaded) {
1138 im->loaded = 0;
1139 ip_mc_filter_del(in_dev, im->multiaddr);
1140 }
1141
1142#ifdef CONFIG_IP_MULTICAST
1143 if (im->multiaddr == IGMP_ALL_HOSTS)
1144 return;
1145
1146 reporter = im->reporter;
1147 igmp_stop_timer(im);
1148
1149 if (!in_dev->dead) {
1150 if (IGMP_V1_SEEN(in_dev))
1151 goto done;
1152 if (IGMP_V2_SEEN(in_dev)) {
1153 if (reporter)
1154 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1155 goto done;
1156 }
1157 /* IGMPv3 */
1158 igmpv3_add_delrec(in_dev, im);
1159
1160 igmp_ifc_event(in_dev);
1161 }
1162done:
1163#endif
1164 ip_mc_clear_src(im);
1165}
1166
1167static void igmp_group_added(struct ip_mc_list *im)
1168{
1169 struct in_device *in_dev = im->interface;
1170
1171 if (im->loaded == 0) {
1172 im->loaded = 1;
1173 ip_mc_filter_add(in_dev, im->multiaddr);
1174 }
1175
1176#ifdef CONFIG_IP_MULTICAST
1177 if (im->multiaddr == IGMP_ALL_HOSTS)
1178 return;
1179
1180 if (in_dev->dead)
1181 return;
1182 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1183 spin_lock_bh(&im->lock);
1184 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1185 spin_unlock_bh(&im->lock);
1186 return;
1187 }
1188 /* else, v3 */
1189
1190 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1191 IGMP_Unsolicited_Report_Count;
1192 igmp_ifc_event(in_dev);
1193#endif
1194}
1195
1196
1197/*
1198 * Multicast list managers
1199 */
1200
1201
1202/*
1203 * A socket has joined a multicast group on device dev.
1204 */
1205
8f935bbd 1206void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1207{
1208 struct ip_mc_list *im;
1209
1210 ASSERT_RTNL();
1211
1212 for (im=in_dev->mc_list; im; im=im->next) {
1213 if (im->multiaddr == addr) {
1214 im->users++;
1215 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1216 goto out;
1217 }
1218 }
1219
8b3a7005 1220 im = kmalloc(sizeof(*im), GFP_KERNEL);
1da177e4
LT		 1221 if (!im)
1222 goto out;
1223
a7e9ff73
JK		 1224 im->users = 1;
1225 im->interface = in_dev;
1da177e4 1226 in_dev_hold(in_dev);
a7e9ff73 1227 im->multiaddr = addr;
1da177e4
LT		 1228 /* initial mode is (EX, empty) */
1229 im->sfmode = MCAST_EXCLUDE;
1230 im->sfcount[MCAST_INCLUDE] = 0;
1231 im->sfcount[MCAST_EXCLUDE] = 1;
1232 im->sources = NULL;
1233 im->tomb = NULL;
1234 im->crcount = 0;
1235 atomic_set(&im->refcnt, 1);
1236 spin_lock_init(&im->lock);
1237#ifdef CONFIG_IP_MULTICAST
a7e9ff73 1238 im->tm_running = 0;
b24b8a24 1239 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1da177e4
LT		 1240 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1241 im->reporter = 0;
1242 im->gsquery = 0;
1243#endif
1244 im->loaded = 0;
1245 write_lock_bh(&in_dev->mc_list_lock);
a7e9ff73
JK		 1246 im->next = in_dev->mc_list;
1247 in_dev->mc_list = im;
b8bae41e 1248 in_dev->mc_count++;
1da177e4
LT		 1249 write_unlock_bh(&in_dev->mc_list_lock);
1250#ifdef CONFIG_IP_MULTICAST
1251 igmpv3_del_delrec(in_dev, im->multiaddr);
1252#endif
1253 igmp_group_added(im);
1254 if (!in_dev->dead)
1255 ip_rt_multicast_event(in_dev);
1256out:
1257 return;
1258}
4bc2f18b 1259EXPORT_SYMBOL(ip_mc_inc_group);
1da177e4 1260
a816c7c7
JV		 1261/*
1262 * Resend IGMP JOIN report; used for bonding.
1263 */
1264void ip_mc_rejoin_group(struct ip_mc_list *im)
1265{
08882669 1266#ifdef CONFIG_IP_MULTICAST
a816c7c7
JV		 1267 struct in_device *in_dev = im->interface;
1268
a816c7c7
JV		 1269 if (im->multiaddr == IGMP_ALL_HOSTS)
1270 return;
1271
e12b4539
FL		 1272 /* a failover is happening and switches
1273 * must be notified immediately */
1274 if (IGMP_V1_SEEN(in_dev))
1275 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
1276 else if (IGMP_V2_SEEN(in_dev))
1277 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
1278 else
1279 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
a816c7c7
JV		 1280#endif
1281}
4bc2f18b 1282EXPORT_SYMBOL(ip_mc_rejoin_group);
a816c7c7 1283
1da177e4
LT		 1284/*
1285 * A socket has left a multicast group on device dev
1286 */
1287
8f935bbd 1288void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1da177e4
LT		 1289{
1290 struct ip_mc_list *i, **ip;
e905a9ed 1291
1da177e4 1292 ASSERT_RTNL();
e905a9ed 1293
1da177e4 1294 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
a7e9ff73 1295 if (i->multiaddr == addr) {
1da177e4
LT		 1296 if (--i->users == 0) {
1297 write_lock_bh(&in_dev->mc_list_lock);
1298 *ip = i->next;
b8bae41e 1299 in_dev->mc_count--;
1da177e4
LT		 1300 write_unlock_bh(&in_dev->mc_list_lock);
1301 igmp_group_dropped(i);
1302
1303 if (!in_dev->dead)
1304 ip_rt_multicast_event(in_dev);
1305
1306 ip_ma_put(i);
1307 return;
1308 }
1309 break;
1310 }
1311 }
1312}
4bc2f18b 1313EXPORT_SYMBOL(ip_mc_dec_group);
1da177e4 1314
75c78500
MS		 1315/* Device changing type */
1316
1317void ip_mc_unmap(struct in_device *in_dev)
1318{
1319 struct ip_mc_list *i;
1320
1321 ASSERT_RTNL();
1322
1323 for (i = in_dev->mc_list; i; i = i->next)
1324 igmp_group_dropped(i);
1325}
1326
1327void ip_mc_remap(struct in_device *in_dev)
1328{
1329 struct ip_mc_list *i;
1330
1331 ASSERT_RTNL();
1332
1333 for (i = in_dev->mc_list; i; i = i->next)
1334 igmp_group_added(i);
1335}
1336
1da177e4
LT		 1337/* Device going down */
1338
1339void ip_mc_down(struct in_device *in_dev)
1340{
1341 struct ip_mc_list *i;
1342
1343 ASSERT_RTNL();
1344
1345 for (i=in_dev->mc_list; i; i=i->next)
1346 igmp_group_dropped(i);
1347
1348#ifdef CONFIG_IP_MULTICAST
1349 in_dev->mr_ifc_count = 0;
1350 if (del_timer(&in_dev->mr_ifc_timer))
1351 __in_dev_put(in_dev);
1352 in_dev->mr_gq_running = 0;
1353 if (del_timer(&in_dev->mr_gq_timer))
1354 __in_dev_put(in_dev);
1355 igmpv3_clear_delrec(in_dev);
1356#endif
1357
1358 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1359}
1360
1361void ip_mc_init_dev(struct in_device *in_dev)
1362{
1363 ASSERT_RTNL();
1364
1365 in_dev->mc_tomb = NULL;
1366#ifdef CONFIG_IP_MULTICAST
1367 in_dev->mr_gq_running = 0;
b24b8a24
PE		 1368 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1369 (unsigned long)in_dev);
1da177e4 1370 in_dev->mr_ifc_count = 0;
b8bae41e 1371 in_dev->mc_count = 0;
b24b8a24
PE		 1372 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1373 (unsigned long)in_dev);
1da177e4
LT		 1374 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1375#endif
1376
1377 rwlock_init(&in_dev->mc_list_lock);
1378 spin_lock_init(&in_dev->mc_tomb_lock);
1379}
1380
1381/* Device going up */
1382
1383void ip_mc_up(struct in_device *in_dev)
1384{
1385 struct ip_mc_list *i;
1386
1387 ASSERT_RTNL();
1388
1389 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1390
1391 for (i=in_dev->mc_list; i; i=i->next)
1392 igmp_group_added(i);
1393}
1394
1395/*
1396 * Device is about to be destroyed: clean up.
1397 */
1398
1399void ip_mc_destroy_dev(struct in_device *in_dev)
1400{
1401 struct ip_mc_list *i;
1402
1403 ASSERT_RTNL();
1404
1405 /* Deactivate timers */
1406 ip_mc_down(in_dev);
1407
1408 write_lock_bh(&in_dev->mc_list_lock);
1409 while ((i = in_dev->mc_list) != NULL) {
1410 in_dev->mc_list = i->next;
b8bae41e 1411 in_dev->mc_count--;
1da177e4 1412 write_unlock_bh(&in_dev->mc_list_lock);
1da177e4
LT		 1413 igmp_group_dropped(i);
1414 ip_ma_put(i);
1415
1416 write_lock_bh(&in_dev->mc_list_lock);
1417 }
1418 write_unlock_bh(&in_dev->mc_list_lock);
1419}
1420
9e917dca 1421/* RTNL is locked */
877acedc 1422static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1da177e4
LT		 1423{
1424 struct flowi fl = { .nl_u = { .ip4_u =
1425 { .daddr = imr->imr_multiaddr.s_addr } } };
1426 struct rtable *rt;
1427 struct net_device *dev = NULL;
1428 struct in_device *idev = NULL;
1429
1430 if (imr->imr_ifindex) {
877acedc 1431 idev = inetdev_by_index(net, imr->imr_ifindex);
1da177e4
LT		 1432 return idev;
1433 }
1434 if (imr->imr_address.s_addr) {
9e917dca 1435 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1da177e4
LT		 1436 if (!dev)
1437 return NULL;
1da177e4
LT		 1438 }
1439
877acedc 1440 if (!dev && !ip_route_output_key(net, &rt, &fl)) {
d8d1f30b 1441 dev = rt->dst.dev;
1da177e4
LT		 1442 ip_rt_put(rt);
1443 }
1444 if (dev) {
1445 imr->imr_ifindex = dev->ifindex;
e5ed6399 1446 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1447 }
1448 return idev;
1449}
1450
1451/*
1452 * Join a socket to a group
1453 */
ab32ea5d
BH		 1454int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1455int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1da177e4
LT		 1456
1457
1458static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1459 __be32 *psfsrc)
1da177e4
LT		 1460{
1461 struct ip_sf_list *psf, *psf_prev;
1462 int rv = 0;
1463
1464 psf_prev = NULL;
1465 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1466 if (psf->sf_inaddr == *psfsrc)
1467 break;
1468 psf_prev = psf;
1469 }
1470 if (!psf || psf->sf_count[sfmode] == 0) {
1471 /* source filter not found, or count wrong => bug */
1472 return -ESRCH;
1473 }
1474 psf->sf_count[sfmode]--;
1475 if (psf->sf_count[sfmode] == 0) {
1476 ip_rt_multicast_event(pmc->interface);
1477 }
1478 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1479#ifdef CONFIG_IP_MULTICAST
1480 struct in_device *in_dev = pmc->interface;
1481#endif
1482
1483 /* no more filters for this source */
1484 if (psf_prev)
1485 psf_prev->sf_next = psf->sf_next;
1486 else
1487 pmc->sources = psf->sf_next;
1488#ifdef CONFIG_IP_MULTICAST
1489 if (psf->sf_oldin &&
1490 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
e905a9ed 1491 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1492 IGMP_Unsolicited_Report_Count;
1493 psf->sf_next = pmc->tomb;
1494 pmc->tomb = psf;
1495 rv = 1;
1496 } else
1497#endif
1498 kfree(psf);
1499 }
1500 return rv;
1501}
1502
1503#ifndef CONFIG_IP_MULTICAST
1504#define igmp_ifc_event(x) do { } while (0)
1505#endif
1506
8f935bbd
AV		 1507static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1508 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1509{
1510 struct ip_mc_list *pmc;
1511 int changerec = 0;
1512 int i, err;
1513
1514 if (!in_dev)
1515 return -ENODEV;
1516 read_lock(&in_dev->mc_list_lock);
1517 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1518 if (*pmca == pmc->multiaddr)
1519 break;
1520 }
1521 if (!pmc) {
1522 /* MCA not found?? bug */
1523 read_unlock(&in_dev->mc_list_lock);
1524 return -ESRCH;
1525 }
1526 spin_lock_bh(&pmc->lock);
1527 read_unlock(&in_dev->mc_list_lock);
1528#ifdef CONFIG_IP_MULTICAST
1529 sf_markstate(pmc);
1530#endif
1531 if (!delta) {
1532 err = -EINVAL;
1533 if (!pmc->sfcount[sfmode])
1534 goto out_unlock;
1535 pmc->sfcount[sfmode]--;
1536 }
1537 err = 0;
1538 for (i=0; i<sfcount; i++) {
1539 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1540
1541 changerec |= rv > 0;
1542 if (!err && rv < 0)
1543 err = rv;
1544 }
1545 if (pmc->sfmode == MCAST_EXCLUDE &&
1546 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1547 pmc->sfcount[MCAST_INCLUDE]) {
1548#ifdef CONFIG_IP_MULTICAST
1549 struct ip_sf_list *psf;
1550#endif
1551
1552 /* filter mode change */
1553 pmc->sfmode = MCAST_INCLUDE;
1554#ifdef CONFIG_IP_MULTICAST
e905a9ed 1555 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1556 IGMP_Unsolicited_Report_Count;
1557 in_dev->mr_ifc_count = pmc->crcount;
1558 for (psf=pmc->sources; psf; psf = psf->sf_next)
1559 psf->sf_crcount = 0;
1560 igmp_ifc_event(pmc->interface);
1561 } else if (sf_setstate(pmc) || changerec) {
1562 igmp_ifc_event(pmc->interface);
1563#endif
1564 }
1565out_unlock:
1566 spin_unlock_bh(&pmc->lock);
1567 return err;
1568}
1569
1570/*
1571 * Add multicast single-source filter to the interface list
1572 */
1573static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
8f935bbd 1574 __be32 *psfsrc, int delta)
1da177e4
LT		 1575{
1576 struct ip_sf_list *psf, *psf_prev;
1577
1578 psf_prev = NULL;
1579 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1580 if (psf->sf_inaddr == *psfsrc)
1581 break;
1582 psf_prev = psf;
1583 }
1584 if (!psf) {
0da974f4 1585 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1586 if (!psf)
1587 return -ENOBUFS;
1da177e4
LT		 1588 psf->sf_inaddr = *psfsrc;
1589 if (psf_prev) {
1590 psf_prev->sf_next = psf;
1591 } else
1592 pmc->sources = psf;
1593 }
1594 psf->sf_count[sfmode]++;
1595 if (psf->sf_count[sfmode] == 1) {
1596 ip_rt_multicast_event(pmc->interface);
1597 }
1598 return 0;
1599}
1600
1601#ifdef CONFIG_IP_MULTICAST
1602static void sf_markstate(struct ip_mc_list *pmc)
1603{
1604 struct ip_sf_list *psf;
1605 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1606
1607 for (psf=pmc->sources; psf; psf=psf->sf_next)
1608 if (pmc->sfcount[MCAST_EXCLUDE]) {
1609 psf->sf_oldin = mca_xcount ==
1610 psf->sf_count[MCAST_EXCLUDE] &&
1611 !psf->sf_count[MCAST_INCLUDE];
1612 } else
1613 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1614}
1615
1616static int sf_setstate(struct ip_mc_list *pmc)
1617{
ad12583f 1618 struct ip_sf_list *psf, *dpsf;
1da177e4
LT		 1619 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1620 int qrv = pmc->interface->mr_qrv;
1621 int new_in, rv;
1622
1623 rv = 0;
1624 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1625 if (pmc->sfcount[MCAST_EXCLUDE]) {
1626 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1627 !psf->sf_count[MCAST_INCLUDE];
1628 } else
1629 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
ad12583f
DS		 1630 if (new_in) {
1631 if (!psf->sf_oldin) {
76edc605 1632 struct ip_sf_list *prev = NULL;
ad12583f
DS		 1633
1634 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1635 if (dpsf->sf_inaddr == psf->sf_inaddr)
1636 break;
1637 prev = dpsf;
1638 }
1639 if (dpsf) {
1640 if (prev)
1641 prev->sf_next = dpsf->sf_next;
1642 else
1643 pmc->tomb = dpsf->sf_next;
1644 kfree(dpsf);
1645 }
1646 psf->sf_crcount = qrv;
1647 rv++;
1648 }
1649 } else if (psf->sf_oldin) {
1650
1651 psf->sf_crcount = 0;
1652 /*
1653 * add or update "delete" records if an active filter
1654 * is now inactive
1655 */
1656 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1657 if (dpsf->sf_inaddr == psf->sf_inaddr)
1658 break;
1659 if (!dpsf) {
3ed37a6f 1660 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
ad12583f
DS		 1661 if (!dpsf)
1662 continue;
1663 *dpsf = *psf;
1664 /* pmc->lock held by callers */
1665 dpsf->sf_next = pmc->tomb;
1666 pmc->tomb = dpsf;
1667 }
1668 dpsf->sf_crcount = qrv;
1da177e4
LT		 1669 rv++;
1670 }
1671 }
1672 return rv;
1673}
1674#endif
1675
1676/*
1677 * Add multicast source filter list to the interface list
1678 */
8f935bbd
AV		 1679static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1680 int sfcount, __be32 *psfsrc, int delta)
1da177e4
LT		 1681{
1682 struct ip_mc_list *pmc;
1683 int isexclude;
1684 int i, err;
1685
1686 if (!in_dev)
1687 return -ENODEV;
1688 read_lock(&in_dev->mc_list_lock);
1689 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1690 if (*pmca == pmc->multiaddr)
1691 break;
1692 }
1693 if (!pmc) {
1694 /* MCA not found?? bug */
1695 read_unlock(&in_dev->mc_list_lock);
1696 return -ESRCH;
1697 }
1698 spin_lock_bh(&pmc->lock);
1699 read_unlock(&in_dev->mc_list_lock);
1700
1701#ifdef CONFIG_IP_MULTICAST
1702 sf_markstate(pmc);
1703#endif
1704 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1705 if (!delta)
1706 pmc->sfcount[sfmode]++;
1707 err = 0;
1708 for (i=0; i<sfcount; i++) {
1709 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1710 if (err)
1711 break;
1712 }
1713 if (err) {
1714 int j;
1715
1716 pmc->sfcount[sfmode]--;
1717 for (j=0; j<i; j++)
1718 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1719 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1720#ifdef CONFIG_IP_MULTICAST
1da177e4 1721 struct ip_sf_list *psf;
cfcabdcc 1722 in_dev = pmc->interface;
1da177e4
LT		 1723#endif
1724
1725 /* filter mode change */
1726 if (pmc->sfcount[MCAST_EXCLUDE])
1727 pmc->sfmode = MCAST_EXCLUDE;
1728 else if (pmc->sfcount[MCAST_INCLUDE])
1729 pmc->sfmode = MCAST_INCLUDE;
1730#ifdef CONFIG_IP_MULTICAST
1731 /* else no filters; keep old mode for reports */
1732
e905a9ed 1733 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1da177e4
LT		 1734 IGMP_Unsolicited_Report_Count;
1735 in_dev->mr_ifc_count = pmc->crcount;
1736 for (psf=pmc->sources; psf; psf = psf->sf_next)
1737 psf->sf_crcount = 0;
1738 igmp_ifc_event(in_dev);
1739 } else if (sf_setstate(pmc)) {
1740 igmp_ifc_event(in_dev);
1741#endif
1742 }
1743 spin_unlock_bh(&pmc->lock);
1744 return err;
1745}
1746
1747static void ip_mc_clear_src(struct ip_mc_list *pmc)
1748{
1749 struct ip_sf_list *psf, *nextpsf;
1750
1751 for (psf=pmc->tomb; psf; psf=nextpsf) {
1752 nextpsf = psf->sf_next;
1753 kfree(psf);
1754 }
1755 pmc->tomb = NULL;
1756 for (psf=pmc->sources; psf; psf=nextpsf) {
1757 nextpsf = psf->sf_next;
1758 kfree(psf);
1759 }
1760 pmc->sources = NULL;
1761 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1762 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1763 pmc->sfcount[MCAST_EXCLUDE] = 1;
1764}
1765
1766
1767/*
1768 * Join a multicast group
1769 */
1770int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1771{
1772 int err;
8f935bbd 1773 __be32 addr = imr->imr_multiaddr.s_addr;
a7e9ff73 1774 struct ip_mc_socklist *iml = NULL, *i;
1da177e4
LT		 1775 struct in_device *in_dev;
1776 struct inet_sock *inet = inet_sk(sk);
877acedc 1777 struct net *net = sock_net(sk);
ca9b907d 1778 int ifindex;
1da177e4
LT		 1779 int count = 0;
1780
f97c1e0c 1781 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1782 return -EINVAL;
1783
6756ae4b 1784 rtnl_lock();
1da177e4 1785
877acedc 1786 in_dev = ip_mc_find_dev(net, imr);
1da177e4
LT		 1787
1788 if (!in_dev) {
1789 iml = NULL;
1790 err = -ENODEV;
1791 goto done;
1792 }
1793
1da177e4 1794 err = -EADDRINUSE;
ca9b907d 1795 ifindex = imr->imr_ifindex;
1da177e4 1796 for (i = inet->mc_list; i; i = i->next) {
ca9b907d
DS		 1797 if (i->multi.imr_multiaddr.s_addr == addr &&
1798 i->multi.imr_ifindex == ifindex)
1da177e4 1799 goto done;
1da177e4
LT		 1800 count++;
1801 }
1802 err = -ENOBUFS;
ca9b907d
DS		 1803 if (count >= sysctl_igmp_max_memberships)
1804 goto done;
a7e9ff73 1805 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
ca9b907d 1806 if (iml == NULL)
1da177e4 1807 goto done;
ca9b907d 1808
1da177e4
LT		 1809 memcpy(&iml->multi, imr, sizeof(*imr));
1810 iml->next = inet->mc_list;
1da177e4
LT		 1811 iml->sflist = NULL;
1812 iml->sfmode = MCAST_EXCLUDE;
c85bb41e 1813 rcu_assign_pointer(inet->mc_list, iml);
1da177e4 1814 ip_mc_inc_group(in_dev, addr);
1da177e4 1815 err = 0;
1da177e4 1816done:
6756ae4b 1817 rtnl_unlock();
1da177e4
LT		 1818 return err;
1819}
4bc2f18b 1820EXPORT_SYMBOL(ip_mc_join_group);
1da177e4 1821
c85bb41e
FL		 1822static void ip_sf_socklist_reclaim(struct rcu_head *rp)
1823{
1824 struct ip_sf_socklist *psf;
1825
1826 psf = container_of(rp, struct ip_sf_socklist, rcu);
1827 /* sk_omem_alloc should have been decreased by the caller*/
1828 kfree(psf);
1829}
1830
1da177e4
LT		 1831static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1832 struct in_device *in_dev)
1833{
c85bb41e 1834 struct ip_sf_socklist *psf = iml->sflist;
1da177e4
LT		 1835 int err;
1836
c85bb41e 1837 if (psf == NULL) {
1da177e4
LT		 1838 /* any-source empty exclude case */
1839 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1840 iml->sfmode, 0, NULL, 0);
1841 }
1842 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
c85bb41e
FL		 1843 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1844 rcu_assign_pointer(iml->sflist, NULL);
1845 /* decrease mem now to avoid the memleak warning */
1846 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1847 call_rcu(&psf->rcu, ip_sf_socklist_reclaim);
1da177e4
LT		 1848 return err;
1849}
1850
c85bb41e
FL		 1851
1852static void ip_mc_socklist_reclaim(struct rcu_head *rp)
1853{
1854 struct ip_mc_socklist *iml;
1855
1856 iml = container_of(rp, struct ip_mc_socklist, rcu);
1857 /* sk_omem_alloc should have been decreased by the caller*/
1858 kfree(iml);
1859}
1860
1861
1da177e4
LT		 1862/*
1863 * Ask a socket to leave a group.
1864 */
1865
1866int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1867{
1868 struct inet_sock *inet = inet_sk(sk);
1869 struct ip_mc_socklist *iml, **imlp;
84b42bae 1870 struct in_device *in_dev;
877acedc 1871 struct net *net = sock_net(sk);
8f935bbd 1872 __be32 group = imr->imr_multiaddr.s_addr;
84b42bae 1873 u32 ifindex;
acd6e00b 1874 int ret = -EADDRNOTAVAIL;
1da177e4
LT		 1875
1876 rtnl_lock();
877acedc 1877 in_dev = ip_mc_find_dev(net, imr);
84b42bae 1878 ifindex = imr->imr_ifindex;
1da177e4 1879 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
acd6e00b
DS		 1880 if (iml->multi.imr_multiaddr.s_addr != group)
1881 continue;
1882 if (ifindex) {
1883 if (iml->multi.imr_ifindex != ifindex)
1884 continue;
1885 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1886 iml->multi.imr_address.s_addr)
1887 continue;
1da177e4 1888
acd6e00b 1889 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4 1890
c85bb41e 1891 rcu_assign_pointer(*imlp, iml->next);
acd6e00b
DS		 1892
1893 if (in_dev)
84b42bae 1894 ip_mc_dec_group(in_dev, group);
acd6e00b 1895 rtnl_unlock();
c85bb41e
FL		 1896 /* decrease mem now to avoid the memleak warning */
1897 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1898 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
acd6e00b 1899 return 0;
1da177e4 1900 }
acd6e00b
DS		 1901 if (!in_dev)
1902 ret = -ENODEV;
1da177e4 1903 rtnl_unlock();
acd6e00b 1904 return ret;
1da177e4
LT		 1905}
1906
1907int ip_mc_source(int add, int omode, struct sock *sk, struct
1908 ip_mreq_source *mreqs, int ifindex)
1909{
1910 int err;
1911 struct ip_mreqn imr;
63007727 1912 __be32 addr = mreqs->imr_multiaddr;
1da177e4
LT		 1913 struct ip_mc_socklist *pmc;
1914 struct in_device *in_dev = NULL;
1915 struct inet_sock *inet = inet_sk(sk);
1916 struct ip_sf_socklist *psl;
877acedc 1917 struct net *net = sock_net(sk);
8cdaaa15 1918 int leavegroup = 0;
1da177e4
LT		 1919 int i, j, rv;
1920
f97c1e0c 1921 if (!ipv4_is_multicast(addr))
1da177e4
LT		 1922 return -EINVAL;
1923
6756ae4b 1924 rtnl_lock();
1da177e4
LT		 1925
1926 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1927 imr.imr_address.s_addr = mreqs->imr_interface;
1928 imr.imr_ifindex = ifindex;
877acedc 1929 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 1930
1931 if (!in_dev) {
1932 err = -ENODEV;
1933 goto done;
1934 }
1935 err = -EADDRNOTAVAIL;
1936
1937 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
f64f9e71
JP		 1938 if ((pmc->multi.imr_multiaddr.s_addr ==
1939 imr.imr_multiaddr.s_addr) &&
1940 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1da177e4
LT		 1941 break;
1942 }
917f2f10
DS		 1943 if (!pmc) { /* must have a prior join */
1944 err = -EINVAL;
1da177e4 1945 goto done;
917f2f10 1946 }
1da177e4
LT		 1947 /* if a source filter was set, must be the same mode as before */
1948 if (pmc->sflist) {
917f2f10
DS		 1949 if (pmc->sfmode != omode) {
1950 err = -EINVAL;
1da177e4 1951 goto done;
917f2f10 1952 }
1da177e4
LT		 1953 } else if (pmc->sfmode != omode) {
1954 /* allow mode switches for empty-set filters */
1955 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
e905a9ed 1956 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1da177e4
LT		 1957 NULL, 0);
1958 pmc->sfmode = omode;
1959 }
1960
1961 psl = pmc->sflist;
1962 if (!add) {
1963 if (!psl)
917f2f10 1964 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1965 rv = !0;
1966 for (i=0; i<psl->sl_count; i++) {
1967 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 1968 sizeof(__be32));
1da177e4
LT		 1969 if (rv == 0)
1970 break;
1971 }
1972 if (rv) /* source not found */
917f2f10 1973 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1974
8cdaaa15
DS		 1975 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1976 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1977 leavegroup = 1;
1978 goto done;
1979 }
1980
1da177e4 1981 /* update the interface filter */
e905a9ed 1982 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 1983 &mreqs->imr_sourceaddr, 1);
1984
1985 for (j=i+1; j<psl->sl_count; j++)
1986 psl->sl_addr[j-1] = psl->sl_addr[j];
1987 psl->sl_count--;
1988 err = 0;
1989 goto done;
1990 }
1991 /* else, add a new source to the filter */
1992
1993 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1994 err = -ENOBUFS;
1995 goto done;
1996 }
1997 if (!psl || psl->sl_count == psl->sl_max) {
1998 struct ip_sf_socklist *newpsl;
1999 int count = IP_SFBLOCK;
2000
2001 if (psl)
2002 count += psl->sl_max;
8b3a7005 2003 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1da177e4
LT		 2004 if (!newpsl) {
2005 err = -ENOBUFS;
2006 goto done;
2007 }
2008 newpsl->sl_max = count;
2009 newpsl->sl_count = count - IP_SFBLOCK;
2010 if (psl) {
2011 for (i=0; i<psl->sl_count; i++)
2012 newpsl->sl_addr[i] = psl->sl_addr[i];
c85bb41e
FL		 2013 /* decrease mem now to avoid the memleak warning */
2014 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2015 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
1da177e4 2016 }
c85bb41e
FL		 2017 rcu_assign_pointer(pmc->sflist, newpsl);
2018 psl = newpsl;
1da177e4
LT		 2019 }
2020 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2021 for (i=0; i<psl->sl_count; i++) {
2022 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
63007727 2023 sizeof(__be32));
1da177e4
LT		 2024 if (rv == 0)
2025 break;
2026 }
2027 if (rv == 0) /* address already there is an error */
2028 goto done;
2029 for (j=psl->sl_count-1; j>=i; j--)
2030 psl->sl_addr[j+1] = psl->sl_addr[j];
2031 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2032 psl->sl_count++;
2033 err = 0;
2034 /* update the interface list */
e905a9ed 2035 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1da177e4
LT		 2036 &mreqs->imr_sourceaddr, 1);
2037done:
6756ae4b 2038 rtnl_unlock();
8cdaaa15
DS		 2039 if (leavegroup)
2040 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2041 return err;
2042}
2043
2044int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2045{
9951f036 2046 int err = 0;
1da177e4 2047 struct ip_mreqn imr;
63007727 2048 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2049 struct ip_mc_socklist *pmc;
2050 struct in_device *in_dev;
2051 struct inet_sock *inet = inet_sk(sk);
2052 struct ip_sf_socklist *newpsl, *psl;
877acedc 2053 struct net *net = sock_net(sk);
9951f036 2054 int leavegroup = 0;
1da177e4 2055
f97c1e0c 2056 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2057 return -EINVAL;
2058 if (msf->imsf_fmode != MCAST_INCLUDE &&
2059 msf->imsf_fmode != MCAST_EXCLUDE)
2060 return -EINVAL;
2061
6756ae4b 2062 rtnl_lock();
1da177e4
LT		 2063
2064 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2065 imr.imr_address.s_addr = msf->imsf_interface;
2066 imr.imr_ifindex = ifindex;
877acedc 2067 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2068
2069 if (!in_dev) {
2070 err = -ENODEV;
2071 goto done;
2072 }
1da177e4 2073
9951f036
DS		 2074 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2075 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2076 leavegroup = 1;
2077 goto done;
2078 }
2079
1da177e4
LT		 2080 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2081 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2082 pmc->multi.imr_ifindex == imr.imr_ifindex)
2083 break;
2084 }
917f2f10
DS		 2085 if (!pmc) { /* must have a prior join */
2086 err = -EINVAL;
1da177e4 2087 goto done;
917f2f10 2088 }
1da177e4 2089 if (msf->imsf_numsrc) {
8b3a7005
KK		 2090 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2091 GFP_KERNEL);
1da177e4
LT		 2092 if (!newpsl) {
2093 err = -ENOBUFS;
2094 goto done;
2095 }
2096 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2097 memcpy(newpsl->sl_addr, msf->imsf_slist,
2098 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2099 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2100 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2101 if (err) {
2102 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2103 goto done;
2104 }
8713dbf0 2105 } else {
1da177e4 2106 newpsl = NULL;
8713dbf0
YZ		 2107 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2108 msf->imsf_fmode, 0, NULL, 0);
2109 }
1da177e4
LT		 2110 psl = pmc->sflist;
2111 if (psl) {
2112 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2113 psl->sl_count, psl->sl_addr, 0);
c85bb41e
FL		 2114 /* decrease mem now to avoid the memleak warning */
2115 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2116 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
1da177e4
LT		 2117 } else
2118 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2119 0, NULL, 0);
c85bb41e 2120 rcu_assign_pointer(pmc->sflist, newpsl);
1da177e4 2121 pmc->sfmode = msf->imsf_fmode;
917f2f10 2122 err = 0;
1da177e4 2123done:
6756ae4b 2124 rtnl_unlock();
9951f036
DS		 2125 if (leavegroup)
2126 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 2127 return err;
2128}
2129
2130int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2131 struct ip_msfilter __user *optval, int __user *optlen)
2132{
2133 int err, len, count, copycount;
2134 struct ip_mreqn imr;
63007727 2135 __be32 addr = msf->imsf_multiaddr;
1da177e4
LT		 2136 struct ip_mc_socklist *pmc;
2137 struct in_device *in_dev;
2138 struct inet_sock *inet = inet_sk(sk);
2139 struct ip_sf_socklist *psl;
877acedc 2140 struct net *net = sock_net(sk);
1da177e4 2141
f97c1e0c 2142 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2143 return -EINVAL;
2144
6756ae4b 2145 rtnl_lock();
1da177e4
LT		 2146
2147 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2148 imr.imr_address.s_addr = msf->imsf_interface;
2149 imr.imr_ifindex = 0;
877acedc 2150 in_dev = ip_mc_find_dev(net, &imr);
1da177e4
LT		 2151
2152 if (!in_dev) {
2153 err = -ENODEV;
2154 goto done;
2155 }
2156 err = -EADDRNOTAVAIL;
2157
2158 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2159 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2160 pmc->multi.imr_ifindex == imr.imr_ifindex)
2161 break;
2162 }
2163 if (!pmc) /* must have a prior join */
2164 goto done;
2165 msf->imsf_fmode = pmc->sfmode;
2166 psl = pmc->sflist;
6756ae4b 2167 rtnl_unlock();
1da177e4
LT		 2168 if (!psl) {
2169 len = 0;
2170 count = 0;
2171 } else {
2172 count = psl->sl_count;
2173 }
2174 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2175 len = copycount * sizeof(psl->sl_addr[0]);
2176 msf->imsf_numsrc = count;
2177 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2178 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2179 return -EFAULT;
2180 }
2181 if (len &&
2182 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2183 return -EFAULT;
2184 return 0;
2185done:
6756ae4b 2186 rtnl_unlock();
1da177e4
LT		 2187 return err;
2188}
2189
2190int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2191 struct group_filter __user *optval, int __user *optlen)
2192{
2193 int err, i, count, copycount;
2194 struct sockaddr_in *psin;
63007727 2195 __be32 addr;
1da177e4
LT		 2196 struct ip_mc_socklist *pmc;
2197 struct inet_sock *inet = inet_sk(sk);
2198 struct ip_sf_socklist *psl;
2199
2200 psin = (struct sockaddr_in *)&gsf->gf_group;
2201 if (psin->sin_family != AF_INET)
2202 return -EINVAL;
2203 addr = psin->sin_addr.s_addr;
f97c1e0c 2204 if (!ipv4_is_multicast(addr))
1da177e4
LT		 2205 return -EINVAL;
2206
6756ae4b 2207 rtnl_lock();
1da177e4
LT		 2208
2209 err = -EADDRNOTAVAIL;
2210
2211 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2212 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2213 pmc->multi.imr_ifindex == gsf->gf_interface)
2214 break;
2215 }
2216 if (!pmc) /* must have a prior join */
2217 goto done;
2218 gsf->gf_fmode = pmc->sfmode;
2219 psl = pmc->sflist;
6756ae4b 2220 rtnl_unlock();
1da177e4
LT		 2221 count = psl ? psl->sl_count : 0;
2222 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2223 gsf->gf_numsrc = count;
2224 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2225 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2226 return -EFAULT;
2227 }
2228 for (i=0; i<copycount; i++) {
1da177e4
LT		 2229 struct sockaddr_storage ss;
2230
2231 psin = (struct sockaddr_in *)&ss;
2232 memset(&ss, 0, sizeof(ss));
2233 psin->sin_family = AF_INET;
2234 psin->sin_addr.s_addr = psl->sl_addr[i];
2235 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2236 return -EFAULT;
2237 }
2238 return 0;
2239done:
6756ae4b 2240 rtnl_unlock();
1da177e4
LT		 2241 return err;
2242}
2243
2244/*
2245 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2246 */
c0cda068 2247int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
1da177e4
LT		 2248{
2249 struct inet_sock *inet = inet_sk(sk);
2250 struct ip_mc_socklist *pmc;
2251 struct ip_sf_socklist *psl;
2252 int i;
c85bb41e 2253 int ret;
1da177e4 2254
c85bb41e 2255 ret = 1;
f97c1e0c 2256 if (!ipv4_is_multicast(loc_addr))
c85bb41e 2257 goto out;
1da177e4 2258
c85bb41e
FL		 2259 rcu_read_lock();
2260 for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) {
1da177e4
LT		 2261 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2262 pmc->multi.imr_ifindex == dif)
2263 break;
2264 }
c85bb41e 2265 ret = inet->mc_all;
1da177e4 2266 if (!pmc)
c85bb41e 2267 goto unlock;
1da177e4 2268 psl = pmc->sflist;
c85bb41e 2269 ret = (pmc->sfmode == MCAST_EXCLUDE);
1da177e4 2270 if (!psl)
c85bb41e 2271 goto unlock;
1da177e4
LT		 2272
2273 for (i=0; i<psl->sl_count; i++) {
2274 if (psl->sl_addr[i] == rmt_addr)
2275 break;
2276 }
c85bb41e 2277 ret = 0;
1da177e4 2278 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
c85bb41e 2279 goto unlock;
1da177e4 2280 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
c85bb41e
FL		 2281 goto unlock;
2282 ret = 1;
2283unlock:
2284 rcu_read_unlock();
2285out:
2286 return ret;
1da177e4
LT		 2287}
2288
2289/*
2290 * A socket is closing.
2291 */
2292
2293void ip_mc_drop_socket(struct sock *sk)
2294{
2295 struct inet_sock *inet = inet_sk(sk);
2296 struct ip_mc_socklist *iml;
877acedc 2297 struct net *net = sock_net(sk);
1da177e4
LT		 2298
2299 if (inet->mc_list == NULL)
2300 return;
2301
2302 rtnl_lock();
2303 while ((iml = inet->mc_list) != NULL) {
2304 struct in_device *in_dev;
c85bb41e 2305 rcu_assign_pointer(inet->mc_list, iml->next);
1da177e4 2306
877acedc 2307 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
bb699cbc
MR		 2308 (void) ip_mc_leave_src(sk, iml, in_dev);
2309 if (in_dev != NULL) {
1da177e4
LT		 2310 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2311 in_dev_put(in_dev);
2312 }
c85bb41e
FL		 2313 /* decrease mem now to avoid the memleak warning */
2314 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2315 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
1da177e4
LT		 2316 }
2317 rtnl_unlock();
2318}
2319
a60c4923 2320int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
1da177e4
LT		 2321{
2322 struct ip_mc_list *im;
2323 struct ip_sf_list *psf;
2324 int rv = 0;
2325
2326 read_lock(&in_dev->mc_list_lock);
2327 for (im=in_dev->mc_list; im; im=im->next) {
2328 if (im->multiaddr == mc_addr)
2329 break;
2330 }
2331 if (im && proto == IPPROTO_IGMP) {
2332 rv = 1;
2333 } else if (im) {
2334 if (src_addr) {
2335 for (psf=im->sources; psf; psf=psf->sf_next) {
2336 if (psf->sf_inaddr == src_addr)
2337 break;
2338 }
2339 if (psf)
2340 rv = psf->sf_count[MCAST_INCLUDE] ||
2341 psf->sf_count[MCAST_EXCLUDE] !=
2342 im->sfcount[MCAST_EXCLUDE];
2343 else
2344 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2345 } else
2346 rv = 1; /* unspecified source; tentatively allow */
2347 }
2348 read_unlock(&in_dev->mc_list_lock);
2349 return rv;
2350}
2351
2352#if defined(CONFIG_PROC_FS)
2353struct igmp_mc_iter_state {
7091e728 2354 struct seq_net_private p;
1da177e4
LT		 2355 struct net_device *dev;
2356 struct in_device *in_dev;
2357};
2358
2359#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2360
2361static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2362{
7091e728 2363 struct net *net = seq_file_net(seq);
1da177e4
LT		 2364 struct ip_mc_list *im = NULL;
2365 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2366
7562f876 2367 state->in_dev = NULL;
61fbab77 2368 for_each_netdev_rcu(net, state->dev) {
1da177e4 2369 struct in_device *in_dev;
6baff150
ED		 2370
2371 in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2372 if (!in_dev)
2373 continue;
2374 read_lock(&in_dev->mc_list_lock);
2375 im = in_dev->mc_list;
2376 if (im) {
2377 state->in_dev = in_dev;
2378 break;
2379 }
2380 read_unlock(&in_dev->mc_list_lock);
1da177e4
LT		 2381 }
2382 return im;
2383}
2384
2385static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2386{
2387 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2388 im = im->next;
2389 while (!im) {
6baff150 2390 if (likely(state->in_dev != NULL))
1da177e4 2391 read_unlock(&state->in_dev->mc_list_lock);
6baff150
ED		 2392
2393 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2394 if (!state->dev) {
2395 state->in_dev = NULL;
2396 break;
2397 }
6baff150 2398 state->in_dev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2399 if (!state->in_dev)
2400 continue;
2401 read_lock(&state->in_dev->mc_list_lock);
2402 im = state->in_dev->mc_list;
2403 }
2404 return im;
2405}
2406
2407static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2408{
2409 struct ip_mc_list *im = igmp_mc_get_first(seq);
2410 if (im)
2411 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2412 --pos;
2413 return pos ? NULL : im;
2414}
2415
2416static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2417 __acquires(rcu)
1da177e4 2418{
61fbab77 2419 rcu_read_lock();
1da177e4
LT		 2420 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2421}
2422
2423static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2424{
2425 struct ip_mc_list *im;
2426 if (v == SEQ_START_TOKEN)
2427 im = igmp_mc_get_first(seq);
2428 else
2429 im = igmp_mc_get_next(seq, v);
2430 ++*pos;
2431 return im;
2432}
2433
2434static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
61fbab77 2435 __releases(rcu)
1da177e4
LT		 2436{
2437 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2438 if (likely(state->in_dev != NULL)) {
2439 read_unlock(&state->in_dev->mc_list_lock);
1da177e4
LT		 2440 state->in_dev = NULL;
2441 }
2442 state->dev = NULL;
61fbab77 2443 rcu_read_unlock();
1da177e4
LT		 2444}
2445
2446static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2447{
2448 if (v == SEQ_START_TOKEN)
e905a9ed 2449 seq_puts(seq,
1da177e4
LT		 2450 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2451 else {
2452 struct ip_mc_list *im = (struct ip_mc_list *)v;
2453 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2454 char *querier;
2455#ifdef CONFIG_IP_MULTICAST
2456 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2457 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2458 "V3";
2459#else
2460 querier = "NONE";
2461#endif
2462
2463 if (state->in_dev->mc_list == im) {
2464 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
b8bae41e 2465 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
1da177e4
LT		 2466 }
2467
2468 seq_printf(seq,
338fcf98 2469 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
1da177e4
LT		 2470 im->multiaddr, im->users,
2471 im->tm_running, im->tm_running ?
2472 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2473 im->reporter);
2474 }
2475 return 0;
2476}
2477
f690808e 2478static const struct seq_operations igmp_mc_seq_ops = {
1da177e4
LT		 2479 .start = igmp_mc_seq_start,
2480 .next = igmp_mc_seq_next,
2481 .stop = igmp_mc_seq_stop,
2482 .show = igmp_mc_seq_show,
2483};
2484
2485static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2486{
7091e728 2487 return seq_open_net(inode, file, &igmp_mc_seq_ops,
cf7732e4 2488 sizeof(struct igmp_mc_iter_state));
1da177e4
LT		 2489}
2490
9a32144e 2491static const struct file_operations igmp_mc_seq_fops = {
1da177e4
LT		 2492 .owner = THIS_MODULE,
2493 .open = igmp_mc_seq_open,
2494 .read = seq_read,
2495 .llseek = seq_lseek,
7091e728 2496 .release = seq_release_net,
1da177e4
LT		 2497};
2498
2499struct igmp_mcf_iter_state {
7091e728 2500 struct seq_net_private p;
1da177e4
LT		 2501 struct net_device *dev;
2502 struct in_device *idev;
2503 struct ip_mc_list *im;
2504};
2505
2506#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2507
2508static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2509{
7091e728 2510 struct net *net = seq_file_net(seq);
1da177e4
LT		 2511 struct ip_sf_list *psf = NULL;
2512 struct ip_mc_list *im = NULL;
2513 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2514
7562f876
PE		 2515 state->idev = NULL;
2516 state->im = NULL;
61fbab77 2517 for_each_netdev_rcu(net, state->dev) {
1da177e4 2518 struct in_device *idev;
6baff150 2519 idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2520 if (unlikely(idev == NULL))
2521 continue;
2522 read_lock(&idev->mc_list_lock);
2523 im = idev->mc_list;
2524 if (likely(im != NULL)) {
2525 spin_lock_bh(&im->lock);
2526 psf = im->sources;
2527 if (likely(psf != NULL)) {
2528 state->im = im;
2529 state->idev = idev;
2530 break;
2531 }
2532 spin_unlock_bh(&im->lock);
2533 }
2534 read_unlock(&idev->mc_list_lock);
1da177e4
LT		 2535 }
2536 return psf;
2537}
2538
2539static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2540{
2541 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2542
2543 psf = psf->sf_next;
2544 while (!psf) {
2545 spin_unlock_bh(&state->im->lock);
2546 state->im = state->im->next;
2547 while (!state->im) {
6baff150 2548 if (likely(state->idev != NULL))
1da177e4 2549 read_unlock(&state->idev->mc_list_lock);
6baff150
ED		 2550
2551 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2552 if (!state->dev) {
2553 state->idev = NULL;
2554 goto out;
2555 }
6baff150 2556 state->idev = __in_dev_get_rcu(state->dev);
1da177e4
LT		 2557 if (!state->idev)
2558 continue;
2559 read_lock(&state->idev->mc_list_lock);
2560 state->im = state->idev->mc_list;
2561 }
2562 if (!state->im)
2563 break;
2564 spin_lock_bh(&state->im->lock);
2565 psf = state->im->sources;
2566 }
2567out:
2568 return psf;
2569}
2570
2571static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2572{
2573 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2574 if (psf)
2575 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2576 --pos;
2577 return pos ? NULL : psf;
2578}
2579
2580static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
61fbab77 2581 __acquires(rcu)
1da177e4 2582{
61fbab77 2583 rcu_read_lock();
1da177e4
LT		 2584 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2585}
2586
2587static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2588{
2589 struct ip_sf_list *psf;
2590 if (v == SEQ_START_TOKEN)
2591 psf = igmp_mcf_get_first(seq);
2592 else
2593 psf = igmp_mcf_get_next(seq, v);
2594 ++*pos;
2595 return psf;
2596}
2597
2598static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
61fbab77 2599 __releases(rcu)
1da177e4
LT		 2600{
2601 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2602 if (likely(state->im != NULL)) {
2603 spin_unlock_bh(&state->im->lock);
2604 state->im = NULL;
2605 }
2606 if (likely(state->idev != NULL)) {
2607 read_unlock(&state->idev->mc_list_lock);
1da177e4
LT		 2608 state->idev = NULL;
2609 }
2610 state->dev = NULL;
61fbab77 2611 rcu_read_unlock();
1da177e4
LT		 2612}
2613
2614static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2615{
2616 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2617 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2618
2619 if (v == SEQ_START_TOKEN) {
e905a9ed 2620 seq_printf(seq,
1da177e4
LT		 2621 "%3s %6s "
2622 "%10s %10s %6s %6s\n", "Idx",
2623 "Device", "MCA",
2624 "SRC", "INC", "EXC");
2625 } else {
2626 seq_printf(seq,
2627 "%3d %6.6s 0x%08x "
e905a9ed
YH		 2628 "0x%08x %6lu %6lu\n",
2629 state->dev->ifindex, state->dev->name,
1da177e4
LT		 2630 ntohl(state->im->multiaddr),
2631 ntohl(psf->sf_inaddr),
2632 psf->sf_count[MCAST_INCLUDE],
2633 psf->sf_count[MCAST_EXCLUDE]);
2634 }
2635 return 0;
2636}
2637
f690808e 2638static const struct seq_operations igmp_mcf_seq_ops = {
1da177e4
LT		 2639 .start = igmp_mcf_seq_start,
2640 .next = igmp_mcf_seq_next,
2641 .stop = igmp_mcf_seq_stop,
2642 .show = igmp_mcf_seq_show,
2643};
2644
2645static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2646{
7091e728 2647 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
cf7732e4 2648 sizeof(struct igmp_mcf_iter_state));
1da177e4
LT		 2649}
2650
9a32144e 2651static const struct file_operations igmp_mcf_seq_fops = {
1da177e4
LT		 2652 .owner = THIS_MODULE,
2653 .open = igmp_mcf_seq_open,
2654 .read = seq_read,
2655 .llseek = seq_lseek,
7091e728 2656 .release = seq_release_net,
1da177e4
LT		 2657};
2658
2c8c1e72 2659static int __net_init igmp_net_init(struct net *net)
1da177e4 2660{
7091e728
AD		 2661 struct proc_dir_entry *pde;
2662
2663 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2664 if (!pde)
2665 goto out_igmp;
2666 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2667 if (!pde)
2668 goto out_mcfilter;
1da177e4 2669 return 0;
7091e728
AD		 2670
2671out_mcfilter:
2672 proc_net_remove(net, "igmp");
2673out_igmp:
2674 return -ENOMEM;
2675}
2676
2c8c1e72 2677static void __net_exit igmp_net_exit(struct net *net)
7091e728
AD		 2678{
2679 proc_net_remove(net, "mcfilter");
2680 proc_net_remove(net, "igmp");
2681}
2682
2683static struct pernet_operations igmp_net_ops = {
2684 .init = igmp_net_init,
2685 .exit = igmp_net_exit,
2686};
2687
2688int __init igmp_mc_proc_init(void)
2689{
2690 return register_pernet_subsys(&igmp_net_ops);
1da177e4
LT		 2691}
2692#endif
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