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Cache xtime every call to update_wall_time
[usb.git] / net / ipv4 / igmp.c
bloba646409c2d068040ac0054b9f2cf3a29472a495d
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 *
11 * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
12 *
13 * Authors:
14 * Alan Cox <Alan.Cox@linux.org>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 *
21 * Fixes:
22 *
23 * Alan Cox : Added lots of __inline__ to optimise
24 * the memory usage of all the tiny little
25 * functions.
26 * Alan Cox : Dumped the header building experiment.
27 * Alan Cox : Minor tweaks ready for multicast routing
28 * and extended IGMP protocol.
29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
30 * writes utterly bogus code otherwise (sigh)
31 * fixed IGMP loopback to behave in the manner
32 * desired by mrouted, fixed the fact it has been
33 * broken since 1.3.6 and cleaned up a few minor
34 * points.
35 *
36 * Chih-Jen Chang : Tried to revise IGMP to Version 2
37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
38 * The enhancements are mainly based on Steve Deering's
39 * ipmulti-3.5 source code.
40 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
41 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
42 * the mrouted version on that device.
43 * Chih-Jen Chang : Added the max_resp_time parameter to
44 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
45 * to identify the multicast router version
46 * and do what the IGMP version 2 specified.
47 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
48 * Tsu-Sheng Tsao if the specified time expired.
49 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
50 * Alan Cox : Use GFP_ATOMIC in the right places.
51 * Christian Daudt : igmp timer wasn't set for local group
52 * memberships but was being deleted,
53 * which caused a "del_timer() called
54 * from %p with timer not initialized\n"
55 * message (960131).
56 * Christian Daudt : removed del_timer from
57 * igmp_timer_expire function (960205).
58 * Christian Daudt : igmp_heard_report now only calls
59 * igmp_timer_expire if tm->running is
60 * true (960216).
61 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
62 * igmp_heard_query never trigger. Expiry
63 * miscalculation fixed in igmp_heard_query
64 * and random() made to return unsigned to
65 * prevent negative expiry times.
66 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
67 * fix from pending 2.1.x patches.
68 * Alan Cox: Forget to enable FDDI support earlier.
69 * Alexey Kuznetsov: Fixed leaving groups on device down.
70 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
71 * David L Stevens: IGMPv3 support, with help from
72 * Vinay Kulkarni
73 */
74
75 #include <linux/module.h>
76 #include <asm/uaccess.h>
77 #include <asm/system.h>
78 #include <linux/types.h>
79 #include <linux/kernel.h>
80 #include <linux/jiffies.h>
81 #include <linux/string.h>
82 #include <linux/socket.h>
83 #include <linux/sockios.h>
84 #include <linux/in.h>
85 #include <linux/inet.h>
86 #include <linux/netdevice.h>
87 #include <linux/skbuff.h>
88 #include <linux/inetdevice.h>
89 #include <linux/igmp.h>
90 #include <linux/if_arp.h>
91 #include <linux/rtnetlink.h>
92 #include <linux/times.h>
93
94 #include <net/arp.h>
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
131 #define IGMP_V1_SEEN(in_dev) \
132 (IPV4_DEVCONF_ALL(FORCE_IGMP_VERSION) == 1 || \
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) \
137 (IPV4_DEVCONF_ALL(FORCE_IGMP_VERSION) == 2 || \
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)))
141
142 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
143 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
144 static void igmpv3_clear_delrec(struct in_device *in_dev);
145 static int sf_setstate(struct ip_mc_list *pmc);
146 static void sf_markstate(struct ip_mc_list *pmc);
147 #endif
148 static void ip_mc_clear_src(struct ip_mc_list *pmc);
149 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
150 int sfcount, __be32 *psfsrc, int delta);
151
152 static 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
166 static __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);
171 im->tm_running=0;
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 */
178 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
179 {
180 int tv=net_random() % max_delay;
181
182 im->tm_running=1;
183 if (!mod_timer(&im->timer, jiffies+tv+2))
184 atomic_inc(&im->refcnt);
185 }
186
187 static 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
196 static 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
204 static 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);
211 im->tm_running=1;
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
229 static 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;
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;
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
273 static int
274 igmp_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
287 static 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;
293
294 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
295 if (skb == NULL)
296 return NULL;
297
298 {
299 struct flowi fl = { .oif = dev->ifindex,
300 .nl_u = { .ip4_u = {
301 .daddr = IGMPV3_ALL_MCR } },
302 .proto = IPPROTO_IGMP };
303 if (ip_route_output_key(&rt, &fl)) {
304 kfree_skb(skb);
305 return NULL;
306 }
307 }
308 if (rt->rt_src == 0) {
309 kfree_skb(skb);
310 ip_rt_put(rt);
311 return NULL;
312 }
313
314 skb->dst = &rt->u.dst;
315 skb->dev = dev;
316
317 skb_reserve(skb, LL_RESERVED_SPACE(dev));
318
319 skb_reset_network_header(skb);
320 pip = ip_hdr(skb);
321 skb_put(skb, sizeof(struct iphdr) + 4);
322
323 pip->version = 4;
324 pip->ihl = (sizeof(struct iphdr)+4)>>2;
325 pip->tos = 0xc0;
326 pip->frag_off = htons(IP_DF);
327 pip->ttl = 1;
328 pip->daddr = rt->rt_dst;
329 pip->saddr = rt->rt_src;
330 pip->protocol = IPPROTO_IGMP;
331 pip->tot_len = 0; /* filled in later */
332 ip_select_ident(pip, &rt->u.dst, NULL);
333 ((u8*)&pip[1])[0] = IPOPT_RA;
334 ((u8*)&pip[1])[1] = 4;
335 ((u8*)&pip[1])[2] = 0;
336 ((u8*)&pip[1])[3] = 0;
337
338 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
339 skb_put(skb, sizeof(*pig));
340 pig = igmpv3_report_hdr(skb);
341 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
342 pig->resv1 = 0;
343 pig->csum = 0;
344 pig->resv2 = 0;
345 pig->ngrec = 0;
346 return skb;
347 }
348
349 static int igmpv3_sendpack(struct sk_buff *skb)
350 {
351 struct iphdr *pip = ip_hdr(skb);
352 struct igmphdr *pig = igmp_hdr(skb);
353 const int iplen = skb->tail - skb->network_header;
354 const int igmplen = skb->tail - skb->transport_header;
355
356 pip->tot_len = htons(iplen);
357 ip_send_check(pip);
358 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
359
360 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
361 dst_output);
362 }
363
364 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
365 {
366 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
367 }
368
369 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
370 int type, struct igmpv3_grec **ppgr)
371 {
372 struct net_device *dev = pmc->interface->dev;
373 struct igmpv3_report *pih;
374 struct igmpv3_grec *pgr;
375
376 if (!skb)
377 skb = igmpv3_newpack(dev, dev->mtu);
378 if (!skb)
379 return NULL;
380 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
381 pgr->grec_type = type;
382 pgr->grec_auxwords = 0;
383 pgr->grec_nsrcs = 0;
384 pgr->grec_mca = pmc->multiaddr;
385 pih = igmpv3_report_hdr(skb);
386 pih->ngrec = htons(ntohs(pih->ngrec)+1);
387 *ppgr = pgr;
388 return skb;
389 }
390
391 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
392 skb_tailroom(skb)) : 0)
393
394 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
395 int type, int gdeleted, int sdeleted)
396 {
397 struct net_device *dev = pmc->interface->dev;
398 struct igmpv3_report *pih;
399 struct igmpv3_grec *pgr = NULL;
400 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
401 int scount, stotal, first, isquery, truncate;
402
403 if (pmc->multiaddr == IGMP_ALL_HOSTS)
404 return skb;
405
406 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
407 type == IGMPV3_MODE_IS_EXCLUDE;
408 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
409 type == IGMPV3_CHANGE_TO_EXCLUDE;
410
411 stotal = scount = 0;
412
413 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
414
415 if (!*psf_list)
416 goto empty_source;
417
418 pih = skb ? igmpv3_report_hdr(skb) : NULL;
419
420 /* EX and TO_EX get a fresh packet, if needed */
421 if (truncate) {
422 if (pih && pih->ngrec &&
423 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
424 if (skb)
425 igmpv3_sendpack(skb);
426 skb = igmpv3_newpack(dev, dev->mtu);
427 }
428 }
429 first = 1;
430 psf_prev = NULL;
431 for (psf=*psf_list; psf; psf=psf_next) {
432 __be32 *psrc;
433
434 psf_next = psf->sf_next;
435
436 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
437 psf_prev = psf;
438 continue;
439 }
440
441 /* clear marks on query responses */
442 if (isquery)
443 psf->sf_gsresp = 0;
444
445 if (AVAILABLE(skb) < sizeof(__be32) +
446 first*sizeof(struct igmpv3_grec)) {
447 if (truncate && !first)
448 break; /* truncate these */
449 if (pgr)
450 pgr->grec_nsrcs = htons(scount);
451 if (skb)
452 igmpv3_sendpack(skb);
453 skb = igmpv3_newpack(dev, dev->mtu);
454 first = 1;
455 scount = 0;
456 }
457 if (first) {
458 skb = add_grhead(skb, pmc, type, &pgr);
459 first = 0;
460 }
461 if (!skb)
462 return NULL;
463 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
464 *psrc = psf->sf_inaddr;
465 scount++; stotal++;
466 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
467 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
468 psf->sf_crcount--;
469 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
470 if (psf_prev)
471 psf_prev->sf_next = psf->sf_next;
472 else
473 *psf_list = psf->sf_next;
474 kfree(psf);
475 continue;
476 }
477 }
478 psf_prev = psf;
479 }
480
481 empty_source:
482 if (!stotal) {
483 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
484 type == IGMPV3_BLOCK_OLD_SOURCES)
485 return skb;
486 if (pmc->crcount || isquery) {
487 /* make sure we have room for group header */
488 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
489 igmpv3_sendpack(skb);
490 skb = NULL; /* add_grhead will get a new one */
491 }
492 skb = add_grhead(skb, pmc, type, &pgr);
493 }
494 }
495 if (pgr)
496 pgr->grec_nsrcs = htons(scount);
497
498 if (isquery)
499 pmc->gsquery = 0; /* clear query state on report */
500 return skb;
501 }
502
503 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
504 {
505 struct sk_buff *skb = NULL;
506 int type;
507
508 if (!pmc) {
509 read_lock(&in_dev->mc_list_lock);
510 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
511 if (pmc->multiaddr == IGMP_ALL_HOSTS)
512 continue;
513 spin_lock_bh(&pmc->lock);
514 if (pmc->sfcount[MCAST_EXCLUDE])
515 type = IGMPV3_MODE_IS_EXCLUDE;
516 else
517 type = IGMPV3_MODE_IS_INCLUDE;
518 skb = add_grec(skb, pmc, type, 0, 0);
519 spin_unlock_bh(&pmc->lock);
520 }
521 read_unlock(&in_dev->mc_list_lock);
522 } else {
523 spin_lock_bh(&pmc->lock);
524 if (pmc->sfcount[MCAST_EXCLUDE])
525 type = IGMPV3_MODE_IS_EXCLUDE;
526 else
527 type = IGMPV3_MODE_IS_INCLUDE;
528 skb = add_grec(skb, pmc, type, 0, 0);
529 spin_unlock_bh(&pmc->lock);
530 }
531 if (!skb)
532 return 0;
533 return igmpv3_sendpack(skb);
534 }
535
536 /*
537 * remove zero-count source records from a source filter list
538 */
539 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
540 {
541 struct ip_sf_list *psf_prev, *psf_next, *psf;
542
543 psf_prev = NULL;
544 for (psf=*ppsf; psf; psf = psf_next) {
545 psf_next = psf->sf_next;
546 if (psf->sf_crcount == 0) {
547 if (psf_prev)
548 psf_prev->sf_next = psf->sf_next;
549 else
550 *ppsf = psf->sf_next;
551 kfree(psf);
552 } else
553 psf_prev = psf;
554 }
555 }
556
557 static void igmpv3_send_cr(struct in_device *in_dev)
558 {
559 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
560 struct sk_buff *skb = NULL;
561 int type, dtype;
562
563 read_lock(&in_dev->mc_list_lock);
564 spin_lock_bh(&in_dev->mc_tomb_lock);
565
566 /* deleted MCA's */
567 pmc_prev = NULL;
568 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
569 pmc_next = pmc->next;
570 if (pmc->sfmode == MCAST_INCLUDE) {
571 type = IGMPV3_BLOCK_OLD_SOURCES;
572 dtype = IGMPV3_BLOCK_OLD_SOURCES;
573 skb = add_grec(skb, pmc, type, 1, 0);
574 skb = add_grec(skb, pmc, dtype, 1, 1);
575 }
576 if (pmc->crcount) {
577 if (pmc->sfmode == MCAST_EXCLUDE) {
578 type = IGMPV3_CHANGE_TO_INCLUDE;
579 skb = add_grec(skb, pmc, type, 1, 0);
580 }
581 pmc->crcount--;
582 if (pmc->crcount == 0) {
583 igmpv3_clear_zeros(&pmc->tomb);
584 igmpv3_clear_zeros(&pmc->sources);
585 }
586 }
587 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
588 if (pmc_prev)
589 pmc_prev->next = pmc_next;
590 else
591 in_dev->mc_tomb = pmc_next;
592 in_dev_put(pmc->interface);
593 kfree(pmc);
594 } else
595 pmc_prev = pmc;
596 }
597 spin_unlock_bh(&in_dev->mc_tomb_lock);
598
599 /* change recs */
600 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
601 spin_lock_bh(&pmc->lock);
602 if (pmc->sfcount[MCAST_EXCLUDE]) {
603 type = IGMPV3_BLOCK_OLD_SOURCES;
604 dtype = IGMPV3_ALLOW_NEW_SOURCES;
605 } else {
606 type = IGMPV3_ALLOW_NEW_SOURCES;
607 dtype = IGMPV3_BLOCK_OLD_SOURCES;
608 }
609 skb = add_grec(skb, pmc, type, 0, 0);
610 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
611
612 /* filter mode changes */
613 if (pmc->crcount) {
614 if (pmc->sfmode == MCAST_EXCLUDE)
615 type = IGMPV3_CHANGE_TO_EXCLUDE;
616 else
617 type = IGMPV3_CHANGE_TO_INCLUDE;
618 skb = add_grec(skb, pmc, type, 0, 0);
619 pmc->crcount--;
620 }
621 spin_unlock_bh(&pmc->lock);
622 }
623 read_unlock(&in_dev->mc_list_lock);
624
625 if (!skb)
626 return;
627 (void) igmpv3_sendpack(skb);
628 }
629
630 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
631 int type)
632 {
633 struct sk_buff *skb;
634 struct iphdr *iph;
635 struct igmphdr *ih;
636 struct rtable *rt;
637 struct net_device *dev = in_dev->dev;
638 __be32 group = pmc ? pmc->multiaddr : 0;
639 __be32 dst;
640
641 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
642 return igmpv3_send_report(in_dev, pmc);
643 else if (type == IGMP_HOST_LEAVE_MESSAGE)
644 dst = IGMP_ALL_ROUTER;
645 else
646 dst = group;
647
648 {
649 struct flowi fl = { .oif = dev->ifindex,
650 .nl_u = { .ip4_u = { .daddr = dst } },
651 .proto = IPPROTO_IGMP };
652 if (ip_route_output_key(&rt, &fl))
653 return -1;
654 }
655 if (rt->rt_src == 0) {
656 ip_rt_put(rt);
657 return -1;
658 }
659
660 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
661 if (skb == NULL) {
662 ip_rt_put(rt);
663 return -1;
664 }
665
666 skb->dst = &rt->u.dst;
667
668 skb_reserve(skb, LL_RESERVED_SPACE(dev));
669
670 skb_reset_network_header(skb);
671 iph = ip_hdr(skb);
672 skb_put(skb, sizeof(struct iphdr) + 4);
673
674 iph->version = 4;
675 iph->ihl = (sizeof(struct iphdr)+4)>>2;
676 iph->tos = 0xc0;
677 iph->frag_off = htons(IP_DF);
678 iph->ttl = 1;
679 iph->daddr = dst;
680 iph->saddr = rt->rt_src;
681 iph->protocol = IPPROTO_IGMP;
682 iph->tot_len = htons(IGMP_SIZE);
683 ip_select_ident(iph, &rt->u.dst, NULL);
684 ((u8*)&iph[1])[0] = IPOPT_RA;
685 ((u8*)&iph[1])[1] = 4;
686 ((u8*)&iph[1])[2] = 0;
687 ((u8*)&iph[1])[3] = 0;
688 ip_send_check(iph);
689
690 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
691 ih->type=type;
692 ih->code=0;
693 ih->csum=0;
694 ih->group=group;
695 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
696
697 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
698 dst_output);
699 }
700
701 static void igmp_gq_timer_expire(unsigned long data)
702 {
703 struct in_device *in_dev = (struct in_device *)data;
704
705 in_dev->mr_gq_running = 0;
706 igmpv3_send_report(in_dev, NULL);
707 __in_dev_put(in_dev);
708 }
709
710 static void igmp_ifc_timer_expire(unsigned long data)
711 {
712 struct in_device *in_dev = (struct in_device *)data;
713
714 igmpv3_send_cr(in_dev);
715 if (in_dev->mr_ifc_count) {
716 in_dev->mr_ifc_count--;
717 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
718 }
719 __in_dev_put(in_dev);
720 }
721
722 static void igmp_ifc_event(struct in_device *in_dev)
723 {
724 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
725 return;
726 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
727 IGMP_Unsolicited_Report_Count;
728 igmp_ifc_start_timer(in_dev, 1);
729 }
730
731
732 static void igmp_timer_expire(unsigned long data)
733 {
734 struct ip_mc_list *im=(struct ip_mc_list *)data;
735 struct in_device *in_dev = im->interface;
736
737 spin_lock(&im->lock);
738 im->tm_running=0;
739
740 if (im->unsolicit_count) {
741 im->unsolicit_count--;
742 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
743 }
744 im->reporter = 1;
745 spin_unlock(&im->lock);
746
747 if (IGMP_V1_SEEN(in_dev))
748 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
749 else if (IGMP_V2_SEEN(in_dev))
750 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
751 else
752 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
753
754 ip_ma_put(im);
755 }
756
757 /* mark EXCLUDE-mode sources */
758 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
759 {
760 struct ip_sf_list *psf;
761 int i, scount;
762
763 scount = 0;
764 for (psf=pmc->sources; psf; psf=psf->sf_next) {
765 if (scount == nsrcs)
766 break;
767 for (i=0; i<nsrcs; i++) {
768 /* skip inactive filters */
769 if (pmc->sfcount[MCAST_INCLUDE] ||
770 pmc->sfcount[MCAST_EXCLUDE] !=
771 psf->sf_count[MCAST_EXCLUDE])
772 continue;
773 if (srcs[i] == psf->sf_inaddr) {
774 scount++;
775 break;
776 }
777 }
778 }
779 pmc->gsquery = 0;
780 if (scount == nsrcs) /* all sources excluded */
781 return 0;
782 return 1;
783 }
784
785 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
786 {
787 struct ip_sf_list *psf;
788 int i, scount;
789
790 if (pmc->sfmode == MCAST_EXCLUDE)
791 return igmp_xmarksources(pmc, nsrcs, srcs);
792
793 /* mark INCLUDE-mode sources */
794 scount = 0;
795 for (psf=pmc->sources; psf; psf=psf->sf_next) {
796 if (scount == nsrcs)
797 break;
798 for (i=0; i<nsrcs; i++)
799 if (srcs[i] == psf->sf_inaddr) {
800 psf->sf_gsresp = 1;
801 scount++;
802 break;
803 }
804 }
805 if (!scount) {
806 pmc->gsquery = 0;
807 return 0;
808 }
809 pmc->gsquery = 1;
810 return 1;
811 }
812
813 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
814 {
815 struct ip_mc_list *im;
816
817 /* Timers are only set for non-local groups */
818
819 if (group == IGMP_ALL_HOSTS)
820 return;
821
822 read_lock(&in_dev->mc_list_lock);
823 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
824 if (im->multiaddr == group) {
825 igmp_stop_timer(im);
826 break;
827 }
828 }
829 read_unlock(&in_dev->mc_list_lock);
830 }
831
832 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
833 int len)
834 {
835 struct igmphdr *ih = igmp_hdr(skb);
836 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
837 struct ip_mc_list *im;
838 __be32 group = ih->group;
839 int max_delay;
840 int mark = 0;
841
842
843 if (len == 8) {
844 if (ih->code == 0) {
845 /* Alas, old v1 router presents here. */
846
847 max_delay = IGMP_Query_Response_Interval;
848 in_dev->mr_v1_seen = jiffies +
849 IGMP_V1_Router_Present_Timeout;
850 group = 0;
851 } else {
852 /* v2 router present */
853 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
854 in_dev->mr_v2_seen = jiffies +
855 IGMP_V2_Router_Present_Timeout;
856 }
857 /* cancel the interface change timer */
858 in_dev->mr_ifc_count = 0;
859 if (del_timer(&in_dev->mr_ifc_timer))
860 __in_dev_put(in_dev);
861 /* clear deleted report items */
862 igmpv3_clear_delrec(in_dev);
863 } else if (len < 12) {
864 return; /* ignore bogus packet; freed by caller */
865 } else { /* v3 */
866 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
867 return;
868
869 ih3 = igmpv3_query_hdr(skb);
870 if (ih3->nsrcs) {
871 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
872 + ntohs(ih3->nsrcs)*sizeof(__be32)))
873 return;
874 ih3 = igmpv3_query_hdr(skb);
875 }
876
877 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
878 if (!max_delay)
879 max_delay = 1; /* can't mod w/ 0 */
880 in_dev->mr_maxdelay = max_delay;
881 if (ih3->qrv)
882 in_dev->mr_qrv = ih3->qrv;
883 if (!group) { /* general query */
884 if (ih3->nsrcs)
885 return; /* no sources allowed */
886 igmp_gq_start_timer(in_dev);
887 return;
888 }
889 /* mark sources to include, if group & source-specific */
890 mark = ih3->nsrcs != 0;
891 }
892
893 /*
894 * - Start the timers in all of our membership records
895 * that the query applies to for the interface on
896 * which the query arrived excl. those that belong
897 * to a "local" group (224.0.0.X)
898 * - For timers already running check if they need to
899 * be reset.
900 * - Use the igmp->igmp_code field as the maximum
901 * delay possible
902 */
903 read_lock(&in_dev->mc_list_lock);
904 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
905 int changed;
906
907 if (group && group != im->multiaddr)
908 continue;
909 if (im->multiaddr == IGMP_ALL_HOSTS)
910 continue;
911 spin_lock_bh(&im->lock);
912 if (im->tm_running)
913 im->gsquery = im->gsquery && mark;
914 else
915 im->gsquery = mark;
916 changed = !im->gsquery ||
917 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
918 spin_unlock_bh(&im->lock);
919 if (changed)
920 igmp_mod_timer(im, max_delay);
921 }
922 read_unlock(&in_dev->mc_list_lock);
923 }
924
925 int igmp_rcv(struct sk_buff *skb)
926 {
927 /* This basically follows the spec line by line -- see RFC1112 */
928 struct igmphdr *ih;
929 struct in_device *in_dev = in_dev_get(skb->dev);
930 int len = skb->len;
931
932 if (in_dev==NULL) {
933 kfree_skb(skb);
934 return 0;
935 }
936
937 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
938 goto drop;
939
940 switch (skb->ip_summed) {
941 case CHECKSUM_COMPLETE:
942 if (!csum_fold(skb->csum))
943 break;
944 /* fall through */
945 case CHECKSUM_NONE:
946 skb->csum = 0;
947 if (__skb_checksum_complete(skb))
948 goto drop;
949 }
950
951 ih = igmp_hdr(skb);
952 switch (ih->type) {
953 case IGMP_HOST_MEMBERSHIP_QUERY:
954 igmp_heard_query(in_dev, skb, len);
955 break;
956 case IGMP_HOST_MEMBERSHIP_REPORT:
957 case IGMPV2_HOST_MEMBERSHIP_REPORT:
958 case IGMPV3_HOST_MEMBERSHIP_REPORT:
959 /* Is it our report looped back? */
960 if (((struct rtable*)skb->dst)->fl.iif == 0)
961 break;
962 /* don't rely on MC router hearing unicast reports */
963 if (skb->pkt_type == PACKET_MULTICAST ||
964 skb->pkt_type == PACKET_BROADCAST)
965 igmp_heard_report(in_dev, ih->group);
966 break;
967 case IGMP_PIM:
968 #ifdef CONFIG_IP_PIMSM_V1
969 in_dev_put(in_dev);
970 return pim_rcv_v1(skb);
971 #endif
972 case IGMP_DVMRP:
973 case IGMP_TRACE:
974 case IGMP_HOST_LEAVE_MESSAGE:
975 case IGMP_MTRACE:
976 case IGMP_MTRACE_RESP:
977 break;
978 default:
979 break;
980 }
981
982 drop:
983 in_dev_put(in_dev);
984 kfree_skb(skb);
985 return 0;
986 }
987
988 #endif
989
990
991 /*
992 * Add a filter to a device
993 */
994
995 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
996 {
997 char buf[MAX_ADDR_LEN];
998 struct net_device *dev = in_dev->dev;
999
1000 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1001 We will get multicast token leakage, when IFF_MULTICAST
1002 is changed. This check should be done in dev->set_multicast_list
1003 routine. Something sort of:
1004 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1005 --ANK
1006 */
1007 if (arp_mc_map(addr, buf, dev, 0) == 0)
1008 dev_mc_add(dev,buf,dev->addr_len,0);
1009 }
1010
1011 /*
1012 * Remove a filter from a device
1013 */
1014
1015 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1016 {
1017 char buf[MAX_ADDR_LEN];
1018 struct net_device *dev = in_dev->dev;
1019
1020 if (arp_mc_map(addr, buf, dev, 0) == 0)
1021 dev_mc_delete(dev,buf,dev->addr_len,0);
1022 }
1023
1024 #ifdef CONFIG_IP_MULTICAST
1025 /*
1026 * deleted ip_mc_list manipulation
1027 */
1028 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1029 {
1030 struct ip_mc_list *pmc;
1031
1032 /* this is an "ip_mc_list" for convenience; only the fields below
1033 * are actually used. In particular, the refcnt and users are not
1034 * used for management of the delete list. Using the same structure
1035 * for deleted items allows change reports to use common code with
1036 * non-deleted or query-response MCA's.
1037 */
1038 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1039 if (!pmc)
1040 return;
1041 spin_lock_bh(&im->lock);
1042 pmc->interface = im->interface;
1043 in_dev_hold(in_dev);
1044 pmc->multiaddr = im->multiaddr;
1045 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1046 IGMP_Unsolicited_Report_Count;
1047 pmc->sfmode = im->sfmode;
1048 if (pmc->sfmode == MCAST_INCLUDE) {
1049 struct ip_sf_list *psf;
1050
1051 pmc->tomb = im->tomb;
1052 pmc->sources = im->sources;
1053 im->tomb = im->sources = NULL;
1054 for (psf=pmc->sources; psf; psf=psf->sf_next)
1055 psf->sf_crcount = pmc->crcount;
1056 }
1057 spin_unlock_bh(&im->lock);
1058
1059 spin_lock_bh(&in_dev->mc_tomb_lock);
1060 pmc->next = in_dev->mc_tomb;
1061 in_dev->mc_tomb = pmc;
1062 spin_unlock_bh(&in_dev->mc_tomb_lock);
1063 }
1064
1065 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1066 {
1067 struct ip_mc_list *pmc, *pmc_prev;
1068 struct ip_sf_list *psf, *psf_next;
1069
1070 spin_lock_bh(&in_dev->mc_tomb_lock);
1071 pmc_prev = NULL;
1072 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1073 if (pmc->multiaddr == multiaddr)
1074 break;
1075 pmc_prev = pmc;
1076 }
1077 if (pmc) {
1078 if (pmc_prev)
1079 pmc_prev->next = pmc->next;
1080 else
1081 in_dev->mc_tomb = pmc->next;
1082 }
1083 spin_unlock_bh(&in_dev->mc_tomb_lock);
1084 if (pmc) {
1085 for (psf=pmc->tomb; psf; psf=psf_next) {
1086 psf_next = psf->sf_next;
1087 kfree(psf);
1088 }
1089 in_dev_put(pmc->interface);
1090 kfree(pmc);
1091 }
1092 }
1093
1094 static void igmpv3_clear_delrec(struct in_device *in_dev)
1095 {
1096 struct ip_mc_list *pmc, *nextpmc;
1097
1098 spin_lock_bh(&in_dev->mc_tomb_lock);
1099 pmc = in_dev->mc_tomb;
1100 in_dev->mc_tomb = NULL;
1101 spin_unlock_bh(&in_dev->mc_tomb_lock);
1102
1103 for (; pmc; pmc = nextpmc) {
1104 nextpmc = pmc->next;
1105 ip_mc_clear_src(pmc);
1106 in_dev_put(pmc->interface);
1107 kfree(pmc);
1108 }
1109 /* clear dead sources, too */
1110 read_lock(&in_dev->mc_list_lock);
1111 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1112 struct ip_sf_list *psf, *psf_next;
1113
1114 spin_lock_bh(&pmc->lock);
1115 psf = pmc->tomb;
1116 pmc->tomb = NULL;
1117 spin_unlock_bh(&pmc->lock);
1118 for (; psf; psf=psf_next) {
1119 psf_next = psf->sf_next;
1120 kfree(psf);
1121 }
1122 }
1123 read_unlock(&in_dev->mc_list_lock);
1124 }
1125 #endif
1126
1127 static void igmp_group_dropped(struct ip_mc_list *im)
1128 {
1129 struct in_device *in_dev = im->interface;
1130 #ifdef CONFIG_IP_MULTICAST
1131 int reporter;
1132 #endif
1133
1134 if (im->loaded) {
1135 im->loaded = 0;
1136 ip_mc_filter_del(in_dev, im->multiaddr);
1137 }
1138
1139 #ifdef CONFIG_IP_MULTICAST
1140 if (im->multiaddr == IGMP_ALL_HOSTS)
1141 return;
1142
1143 reporter = im->reporter;
1144 igmp_stop_timer(im);
1145
1146 if (!in_dev->dead) {
1147 if (IGMP_V1_SEEN(in_dev))
1148 goto done;
1149 if (IGMP_V2_SEEN(in_dev)) {
1150 if (reporter)
1151 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1152 goto done;
1153 }
1154 /* IGMPv3 */
1155 igmpv3_add_delrec(in_dev, im);
1156
1157 igmp_ifc_event(in_dev);
1158 }
1159 done:
1160 #endif
1161 ip_mc_clear_src(im);
1162 }
1163
1164 static void igmp_group_added(struct ip_mc_list *im)
1165 {
1166 struct in_device *in_dev = im->interface;
1167
1168 if (im->loaded == 0) {
1169 im->loaded = 1;
1170 ip_mc_filter_add(in_dev, im->multiaddr);
1171 }
1172
1173 #ifdef CONFIG_IP_MULTICAST
1174 if (im->multiaddr == IGMP_ALL_HOSTS)
1175 return;
1176
1177 if (in_dev->dead)
1178 return;
1179 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1180 spin_lock_bh(&im->lock);
1181 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1182 spin_unlock_bh(&im->lock);
1183 return;
1184 }
1185 /* else, v3 */
1186
1187 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1188 IGMP_Unsolicited_Report_Count;
1189 igmp_ifc_event(in_dev);
1190 #endif
1191 }
1192
1193
1194 /*
1195 * Multicast list managers
1196 */
1197
1198
1199 /*
1200 * A socket has joined a multicast group on device dev.
1201 */
1202
1203 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1204 {
1205 struct ip_mc_list *im;
1206
1207 ASSERT_RTNL();
1208
1209 for (im=in_dev->mc_list; im; im=im->next) {
1210 if (im->multiaddr == addr) {
1211 im->users++;
1212 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1213 goto out;
1214 }
1215 }
1216
1217 im = kmalloc(sizeof(*im), GFP_KERNEL);
1218 if (!im)
1219 goto out;
1220
1221 im->users=1;
1222 im->interface=in_dev;
1223 in_dev_hold(in_dev);
1224 im->multiaddr=addr;
1225 /* initial mode is (EX, empty) */
1226 im->sfmode = MCAST_EXCLUDE;
1227 im->sfcount[MCAST_INCLUDE] = 0;
1228 im->sfcount[MCAST_EXCLUDE] = 1;
1229 im->sources = NULL;
1230 im->tomb = NULL;
1231 im->crcount = 0;
1232 atomic_set(&im->refcnt, 1);
1233 spin_lock_init(&im->lock);
1234 #ifdef CONFIG_IP_MULTICAST
1235 im->tm_running=0;
1236 init_timer(&im->timer);
1237 im->timer.data=(unsigned long)im;
1238 im->timer.function=&igmp_timer_expire;
1239 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1240 im->reporter = 0;
1241 im->gsquery = 0;
1242 #endif
1243 im->loaded = 0;
1244 write_lock_bh(&in_dev->mc_list_lock);
1245 im->next=in_dev->mc_list;
1246 in_dev->mc_list=im;
1247 write_unlock_bh(&in_dev->mc_list_lock);
1248 #ifdef CONFIG_IP_MULTICAST
1249 igmpv3_del_delrec(in_dev, im->multiaddr);
1250 #endif
1251 igmp_group_added(im);
1252 if (!in_dev->dead)
1253 ip_rt_multicast_event(in_dev);
1254 out:
1255 return;
1256 }
1257
1258 /*
1259 * Resend IGMP JOIN report; used for bonding.
1260 */
1261 void ip_mc_rejoin_group(struct ip_mc_list *im)
1262 {
1263 #ifdef CONFIG_IP_MULTICAST
1264 struct in_device *in_dev = im->interface;
1265
1266 if (im->multiaddr == IGMP_ALL_HOSTS)
1267 return;
1268
1269 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1270 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1271 return;
1272 }
1273 /* else, v3 */
1274 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1275 IGMP_Unsolicited_Report_Count;
1276 igmp_ifc_event(in_dev);
1277 #endif
1278 }
1279
1280 /*
1281 * A socket has left a multicast group on device dev
1282 */
1283
1284 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1285 {
1286 struct ip_mc_list *i, **ip;
1287
1288 ASSERT_RTNL();
1289
1290 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1291 if (i->multiaddr==addr) {
1292 if (--i->users == 0) {
1293 write_lock_bh(&in_dev->mc_list_lock);
1294 *ip = i->next;
1295 write_unlock_bh(&in_dev->mc_list_lock);
1296 igmp_group_dropped(i);
1297
1298 if (!in_dev->dead)
1299 ip_rt_multicast_event(in_dev);
1300
1301 ip_ma_put(i);
1302 return;
1303 }
1304 break;
1305 }
1306 }
1307 }
1308
1309 /* Device going down */
1310
1311 void ip_mc_down(struct in_device *in_dev)
1312 {
1313 struct ip_mc_list *i;
1314
1315 ASSERT_RTNL();
1316
1317 for (i=in_dev->mc_list; i; i=i->next)
1318 igmp_group_dropped(i);
1319
1320 #ifdef CONFIG_IP_MULTICAST
1321 in_dev->mr_ifc_count = 0;
1322 if (del_timer(&in_dev->mr_ifc_timer))
1323 __in_dev_put(in_dev);
1324 in_dev->mr_gq_running = 0;
1325 if (del_timer(&in_dev->mr_gq_timer))
1326 __in_dev_put(in_dev);
1327 igmpv3_clear_delrec(in_dev);
1328 #endif
1329
1330 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1331 }
1332
1333 void ip_mc_init_dev(struct in_device *in_dev)
1334 {
1335 ASSERT_RTNL();
1336
1337 in_dev->mc_tomb = NULL;
1338 #ifdef CONFIG_IP_MULTICAST
1339 in_dev->mr_gq_running = 0;
1340 init_timer(&in_dev->mr_gq_timer);
1341 in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1342 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1343 in_dev->mr_ifc_count = 0;
1344 init_timer(&in_dev->mr_ifc_timer);
1345 in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1346 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1347 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1348 #endif
1349
1350 rwlock_init(&in_dev->mc_list_lock);
1351 spin_lock_init(&in_dev->mc_tomb_lock);
1352 }
1353
1354 /* Device going up */
1355
1356 void ip_mc_up(struct in_device *in_dev)
1357 {
1358 struct ip_mc_list *i;
1359
1360 ASSERT_RTNL();
1361
1362 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1363
1364 for (i=in_dev->mc_list; i; i=i->next)
1365 igmp_group_added(i);
1366 }
1367
1368 /*
1369 * Device is about to be destroyed: clean up.
1370 */
1371
1372 void ip_mc_destroy_dev(struct in_device *in_dev)
1373 {
1374 struct ip_mc_list *i;
1375
1376 ASSERT_RTNL();
1377
1378 /* Deactivate timers */
1379 ip_mc_down(in_dev);
1380
1381 write_lock_bh(&in_dev->mc_list_lock);
1382 while ((i = in_dev->mc_list) != NULL) {
1383 in_dev->mc_list = i->next;
1384 write_unlock_bh(&in_dev->mc_list_lock);
1385
1386 igmp_group_dropped(i);
1387 ip_ma_put(i);
1388
1389 write_lock_bh(&in_dev->mc_list_lock);
1390 }
1391 write_unlock_bh(&in_dev->mc_list_lock);
1392 }
1393
1394 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1395 {
1396 struct flowi fl = { .nl_u = { .ip4_u =
1397 { .daddr = imr->imr_multiaddr.s_addr } } };
1398 struct rtable *rt;
1399 struct net_device *dev = NULL;
1400 struct in_device *idev = NULL;
1401
1402 if (imr->imr_ifindex) {
1403 idev = inetdev_by_index(imr->imr_ifindex);
1404 if (idev)
1405 __in_dev_put(idev);
1406 return idev;
1407 }
1408 if (imr->imr_address.s_addr) {
1409 dev = ip_dev_find(imr->imr_address.s_addr);
1410 if (!dev)
1411 return NULL;
1412 dev_put(dev);
1413 }
1414
1415 if (!dev && !ip_route_output_key(&rt, &fl)) {
1416 dev = rt->u.dst.dev;
1417 ip_rt_put(rt);
1418 }
1419 if (dev) {
1420 imr->imr_ifindex = dev->ifindex;
1421 idev = __in_dev_get_rtnl(dev);
1422 }
1423 return idev;
1424 }
1425
1426 /*
1427 * Join a socket to a group
1428 */
1429 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1430 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1431
1432
1433 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1434 __be32 *psfsrc)
1435 {
1436 struct ip_sf_list *psf, *psf_prev;
1437 int rv = 0;
1438
1439 psf_prev = NULL;
1440 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1441 if (psf->sf_inaddr == *psfsrc)
1442 break;
1443 psf_prev = psf;
1444 }
1445 if (!psf || psf->sf_count[sfmode] == 0) {
1446 /* source filter not found, or count wrong => bug */
1447 return -ESRCH;
1448 }
1449 psf->sf_count[sfmode]--;
1450 if (psf->sf_count[sfmode] == 0) {
1451 ip_rt_multicast_event(pmc->interface);
1452 }
1453 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1454 #ifdef CONFIG_IP_MULTICAST
1455 struct in_device *in_dev = pmc->interface;
1456 #endif
1457
1458 /* no more filters for this source */
1459 if (psf_prev)
1460 psf_prev->sf_next = psf->sf_next;
1461 else
1462 pmc->sources = psf->sf_next;
1463 #ifdef CONFIG_IP_MULTICAST
1464 if (psf->sf_oldin &&
1465 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1466 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1467 IGMP_Unsolicited_Report_Count;
1468 psf->sf_next = pmc->tomb;
1469 pmc->tomb = psf;
1470 rv = 1;
1471 } else
1472 #endif
1473 kfree(psf);
1474 }
1475 return rv;
1476 }
1477
1478 #ifndef CONFIG_IP_MULTICAST
1479 #define igmp_ifc_event(x) do { } while (0)
1480 #endif
1481
1482 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1483 int sfcount, __be32 *psfsrc, int delta)
1484 {
1485 struct ip_mc_list *pmc;
1486 int changerec = 0;
1487 int i, err;
1488
1489 if (!in_dev)
1490 return -ENODEV;
1491 read_lock(&in_dev->mc_list_lock);
1492 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1493 if (*pmca == pmc->multiaddr)
1494 break;
1495 }
1496 if (!pmc) {
1497 /* MCA not found?? bug */
1498 read_unlock(&in_dev->mc_list_lock);
1499 return -ESRCH;
1500 }
1501 spin_lock_bh(&pmc->lock);
1502 read_unlock(&in_dev->mc_list_lock);
1503 #ifdef CONFIG_IP_MULTICAST
1504 sf_markstate(pmc);
1505 #endif
1506 if (!delta) {
1507 err = -EINVAL;
1508 if (!pmc->sfcount[sfmode])
1509 goto out_unlock;
1510 pmc->sfcount[sfmode]--;
1511 }
1512 err = 0;
1513 for (i=0; i<sfcount; i++) {
1514 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1515
1516 changerec |= rv > 0;
1517 if (!err && rv < 0)
1518 err = rv;
1519 }
1520 if (pmc->sfmode == MCAST_EXCLUDE &&
1521 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1522 pmc->sfcount[MCAST_INCLUDE]) {
1523 #ifdef CONFIG_IP_MULTICAST
1524 struct ip_sf_list *psf;
1525 #endif
1526
1527 /* filter mode change */
1528 pmc->sfmode = MCAST_INCLUDE;
1529 #ifdef CONFIG_IP_MULTICAST
1530 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1531 IGMP_Unsolicited_Report_Count;
1532 in_dev->mr_ifc_count = pmc->crcount;
1533 for (psf=pmc->sources; psf; psf = psf->sf_next)
1534 psf->sf_crcount = 0;
1535 igmp_ifc_event(pmc->interface);
1536 } else if (sf_setstate(pmc) || changerec) {
1537 igmp_ifc_event(pmc->interface);
1538 #endif
1539 }
1540 out_unlock:
1541 spin_unlock_bh(&pmc->lock);
1542 return err;
1543 }
1544
1545 /*
1546 * Add multicast single-source filter to the interface list
1547 */
1548 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1549 __be32 *psfsrc, int delta)
1550 {
1551 struct ip_sf_list *psf, *psf_prev;
1552
1553 psf_prev = NULL;
1554 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1555 if (psf->sf_inaddr == *psfsrc)
1556 break;
1557 psf_prev = psf;
1558 }
1559 if (!psf) {
1560 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1561 if (!psf)
1562 return -ENOBUFS;
1563 psf->sf_inaddr = *psfsrc;
1564 if (psf_prev) {
1565 psf_prev->sf_next = psf;
1566 } else
1567 pmc->sources = psf;
1568 }
1569 psf->sf_count[sfmode]++;
1570 if (psf->sf_count[sfmode] == 1) {
1571 ip_rt_multicast_event(pmc->interface);
1572 }
1573 return 0;
1574 }
1575
1576 #ifdef CONFIG_IP_MULTICAST
1577 static void sf_markstate(struct ip_mc_list *pmc)
1578 {
1579 struct ip_sf_list *psf;
1580 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1581
1582 for (psf=pmc->sources; psf; psf=psf->sf_next)
1583 if (pmc->sfcount[MCAST_EXCLUDE]) {
1584 psf->sf_oldin = mca_xcount ==
1585 psf->sf_count[MCAST_EXCLUDE] &&
1586 !psf->sf_count[MCAST_INCLUDE];
1587 } else
1588 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1589 }
1590
1591 static int sf_setstate(struct ip_mc_list *pmc)
1592 {
1593 struct ip_sf_list *psf, *dpsf;
1594 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1595 int qrv = pmc->interface->mr_qrv;
1596 int new_in, rv;
1597
1598 rv = 0;
1599 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1600 if (pmc->sfcount[MCAST_EXCLUDE]) {
1601 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1602 !psf->sf_count[MCAST_INCLUDE];
1603 } else
1604 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1605 if (new_in) {
1606 if (!psf->sf_oldin) {
1607 struct ip_sf_list *prev = NULL;
1608
1609 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1610 if (dpsf->sf_inaddr == psf->sf_inaddr)
1611 break;
1612 prev = dpsf;
1613 }
1614 if (dpsf) {
1615 if (prev)
1616 prev->sf_next = dpsf->sf_next;
1617 else
1618 pmc->tomb = dpsf->sf_next;
1619 kfree(dpsf);
1620 }
1621 psf->sf_crcount = qrv;
1622 rv++;
1623 }
1624 } else if (psf->sf_oldin) {
1625
1626 psf->sf_crcount = 0;
1627 /*
1628 * add or update "delete" records if an active filter
1629 * is now inactive
1630 */
1631 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1632 if (dpsf->sf_inaddr == psf->sf_inaddr)
1633 break;
1634 if (!dpsf) {
1635 dpsf = (struct ip_sf_list *)
1636 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1637 if (!dpsf)
1638 continue;
1639 *dpsf = *psf;
1640 /* pmc->lock held by callers */
1641 dpsf->sf_next = pmc->tomb;
1642 pmc->tomb = dpsf;
1643 }
1644 dpsf->sf_crcount = qrv;
1645 rv++;
1646 }
1647 }
1648 return rv;
1649 }
1650 #endif
1651
1652 /*
1653 * Add multicast source filter list to the interface list
1654 */
1655 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1656 int sfcount, __be32 *psfsrc, int delta)
1657 {
1658 struct ip_mc_list *pmc;
1659 int isexclude;
1660 int i, err;
1661
1662 if (!in_dev)
1663 return -ENODEV;
1664 read_lock(&in_dev->mc_list_lock);
1665 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1666 if (*pmca == pmc->multiaddr)
1667 break;
1668 }
1669 if (!pmc) {
1670 /* MCA not found?? bug */
1671 read_unlock(&in_dev->mc_list_lock);
1672 return -ESRCH;
1673 }
1674 spin_lock_bh(&pmc->lock);
1675 read_unlock(&in_dev->mc_list_lock);
1676
1677 #ifdef CONFIG_IP_MULTICAST
1678 sf_markstate(pmc);
1679 #endif
1680 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1681 if (!delta)
1682 pmc->sfcount[sfmode]++;
1683 err = 0;
1684 for (i=0; i<sfcount; i++) {
1685 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1686 if (err)
1687 break;
1688 }
1689 if (err) {
1690 int j;
1691
1692 pmc->sfcount[sfmode]--;
1693 for (j=0; j<i; j++)
1694 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1695 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1696 #ifdef CONFIG_IP_MULTICAST
1697 struct in_device *in_dev = pmc->interface;
1698 struct ip_sf_list *psf;
1699 #endif
1700
1701 /* filter mode change */
1702 if (pmc->sfcount[MCAST_EXCLUDE])
1703 pmc->sfmode = MCAST_EXCLUDE;
1704 else if (pmc->sfcount[MCAST_INCLUDE])
1705 pmc->sfmode = MCAST_INCLUDE;
1706 #ifdef CONFIG_IP_MULTICAST
1707 /* else no filters; keep old mode for reports */
1708
1709 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1710 IGMP_Unsolicited_Report_Count;
1711 in_dev->mr_ifc_count = pmc->crcount;
1712 for (psf=pmc->sources; psf; psf = psf->sf_next)
1713 psf->sf_crcount = 0;
1714 igmp_ifc_event(in_dev);
1715 } else if (sf_setstate(pmc)) {
1716 igmp_ifc_event(in_dev);
1717 #endif
1718 }
1719 spin_unlock_bh(&pmc->lock);
1720 return err;
1721 }
1722
1723 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1724 {
1725 struct ip_sf_list *psf, *nextpsf;
1726
1727 for (psf=pmc->tomb; psf; psf=nextpsf) {
1728 nextpsf = psf->sf_next;
1729 kfree(psf);
1730 }
1731 pmc->tomb = NULL;
1732 for (psf=pmc->sources; psf; psf=nextpsf) {
1733 nextpsf = psf->sf_next;
1734 kfree(psf);
1735 }
1736 pmc->sources = NULL;
1737 pmc->sfmode = MCAST_EXCLUDE;
1738 pmc->sfcount[MCAST_INCLUDE] = 0;
1739 pmc->sfcount[MCAST_EXCLUDE] = 1;
1740 }
1741
1742
1743 /*
1744 * Join a multicast group
1745 */
1746 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1747 {
1748 int err;
1749 __be32 addr = imr->imr_multiaddr.s_addr;
1750 struct ip_mc_socklist *iml=NULL, *i;
1751 struct in_device *in_dev;
1752 struct inet_sock *inet = inet_sk(sk);
1753 int ifindex;
1754 int count = 0;
1755
1756 if (!MULTICAST(addr))
1757 return -EINVAL;
1758
1759 rtnl_lock();
1760
1761 in_dev = ip_mc_find_dev(imr);
1762
1763 if (!in_dev) {
1764 iml = NULL;
1765 err = -ENODEV;
1766 goto done;
1767 }
1768
1769 err = -EADDRINUSE;
1770 ifindex = imr->imr_ifindex;
1771 for (i = inet->mc_list; i; i = i->next) {
1772 if (i->multi.imr_multiaddr.s_addr == addr &&
1773 i->multi.imr_ifindex == ifindex)
1774 goto done;
1775 count++;
1776 }
1777 err = -ENOBUFS;
1778 if (count >= sysctl_igmp_max_memberships)
1779 goto done;
1780 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1781 if (iml == NULL)
1782 goto done;
1783
1784 memcpy(&iml->multi, imr, sizeof(*imr));
1785 iml->next = inet->mc_list;
1786 iml->sflist = NULL;
1787 iml->sfmode = MCAST_EXCLUDE;
1788 inet->mc_list = iml;
1789 ip_mc_inc_group(in_dev, addr);
1790 err = 0;
1791 done:
1792 rtnl_unlock();
1793 return err;
1794 }
1795
1796 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1797 struct in_device *in_dev)
1798 {
1799 int err;
1800
1801 if (iml->sflist == 0) {
1802 /* any-source empty exclude case */
1803 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1804 iml->sfmode, 0, NULL, 0);
1805 }
1806 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1807 iml->sfmode, iml->sflist->sl_count,
1808 iml->sflist->sl_addr, 0);
1809 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1810 iml->sflist = NULL;
1811 return err;
1812 }
1813
1814 /*
1815 * Ask a socket to leave a group.
1816 */
1817
1818 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1819 {
1820 struct inet_sock *inet = inet_sk(sk);
1821 struct ip_mc_socklist *iml, **imlp;
1822 struct in_device *in_dev;
1823 __be32 group = imr->imr_multiaddr.s_addr;
1824 u32 ifindex;
1825 int ret = -EADDRNOTAVAIL;
1826
1827 rtnl_lock();
1828 in_dev = ip_mc_find_dev(imr);
1829 ifindex = imr->imr_ifindex;
1830 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1831 if (iml->multi.imr_multiaddr.s_addr != group)
1832 continue;
1833 if (ifindex) {
1834 if (iml->multi.imr_ifindex != ifindex)
1835 continue;
1836 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1837 iml->multi.imr_address.s_addr)
1838 continue;
1839
1840 (void) ip_mc_leave_src(sk, iml, in_dev);
1841
1842 *imlp = iml->next;
1843
1844 if (in_dev)
1845 ip_mc_dec_group(in_dev, group);
1846 rtnl_unlock();
1847 sock_kfree_s(sk, iml, sizeof(*iml));
1848 return 0;
1849 }
1850 if (!in_dev)
1851 ret = -ENODEV;
1852 rtnl_unlock();
1853 return ret;
1854 }
1855
1856 int ip_mc_source(int add, int omode, struct sock *sk, struct
1857 ip_mreq_source *mreqs, int ifindex)
1858 {
1859 int err;
1860 struct ip_mreqn imr;
1861 __be32 addr = mreqs->imr_multiaddr;
1862 struct ip_mc_socklist *pmc;
1863 struct in_device *in_dev = NULL;
1864 struct inet_sock *inet = inet_sk(sk);
1865 struct ip_sf_socklist *psl;
1866 int leavegroup = 0;
1867 int i, j, rv;
1868
1869 if (!MULTICAST(addr))
1870 return -EINVAL;
1871
1872 rtnl_lock();
1873
1874 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1875 imr.imr_address.s_addr = mreqs->imr_interface;
1876 imr.imr_ifindex = ifindex;
1877 in_dev = ip_mc_find_dev(&imr);
1878
1879 if (!in_dev) {
1880 err = -ENODEV;
1881 goto done;
1882 }
1883 err = -EADDRNOTAVAIL;
1884
1885 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1886 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1887 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1888 break;
1889 }
1890 if (!pmc) { /* must have a prior join */
1891 err = -EINVAL;
1892 goto done;
1893 }
1894 /* if a source filter was set, must be the same mode as before */
1895 if (pmc->sflist) {
1896 if (pmc->sfmode != omode) {
1897 err = -EINVAL;
1898 goto done;
1899 }
1900 } else if (pmc->sfmode != omode) {
1901 /* allow mode switches for empty-set filters */
1902 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1903 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1904 NULL, 0);
1905 pmc->sfmode = omode;
1906 }
1907
1908 psl = pmc->sflist;
1909 if (!add) {
1910 if (!psl)
1911 goto done; /* err = -EADDRNOTAVAIL */
1912 rv = !0;
1913 for (i=0; i<psl->sl_count; i++) {
1914 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1915 sizeof(__be32));
1916 if (rv == 0)
1917 break;
1918 }
1919 if (rv) /* source not found */
1920 goto done; /* err = -EADDRNOTAVAIL */
1921
1922 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1923 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1924 leavegroup = 1;
1925 goto done;
1926 }
1927
1928 /* update the interface filter */
1929 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1930 &mreqs->imr_sourceaddr, 1);
1931
1932 for (j=i+1; j<psl->sl_count; j++)
1933 psl->sl_addr[j-1] = psl->sl_addr[j];
1934 psl->sl_count--;
1935 err = 0;
1936 goto done;
1937 }
1938 /* else, add a new source to the filter */
1939
1940 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1941 err = -ENOBUFS;
1942 goto done;
1943 }
1944 if (!psl || psl->sl_count == psl->sl_max) {
1945 struct ip_sf_socklist *newpsl;
1946 int count = IP_SFBLOCK;
1947
1948 if (psl)
1949 count += psl->sl_max;
1950 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1951 if (!newpsl) {
1952 err = -ENOBUFS;
1953 goto done;
1954 }
1955 newpsl->sl_max = count;
1956 newpsl->sl_count = count - IP_SFBLOCK;
1957 if (psl) {
1958 for (i=0; i<psl->sl_count; i++)
1959 newpsl->sl_addr[i] = psl->sl_addr[i];
1960 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1961 }
1962 pmc->sflist = psl = newpsl;
1963 }
1964 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1965 for (i=0; i<psl->sl_count; i++) {
1966 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1967 sizeof(__be32));
1968 if (rv == 0)
1969 break;
1970 }
1971 if (rv == 0) /* address already there is an error */
1972 goto done;
1973 for (j=psl->sl_count-1; j>=i; j--)
1974 psl->sl_addr[j+1] = psl->sl_addr[j];
1975 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1976 psl->sl_count++;
1977 err = 0;
1978 /* update the interface list */
1979 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1980 &mreqs->imr_sourceaddr, 1);
1981 done:
1982 rtnl_unlock();
1983 if (leavegroup)
1984 return ip_mc_leave_group(sk, &imr);
1985 return err;
1986 }
1987
1988 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1989 {
1990 int err = 0;
1991 struct ip_mreqn imr;
1992 __be32 addr = msf->imsf_multiaddr;
1993 struct ip_mc_socklist *pmc;
1994 struct in_device *in_dev;
1995 struct inet_sock *inet = inet_sk(sk);
1996 struct ip_sf_socklist *newpsl, *psl;
1997 int leavegroup = 0;
1998
1999 if (!MULTICAST(addr))
2000 return -EINVAL;
2001 if (msf->imsf_fmode != MCAST_INCLUDE &&
2002 msf->imsf_fmode != MCAST_EXCLUDE)
2003 return -EINVAL;
2004
2005 rtnl_lock();
2006
2007 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2008 imr.imr_address.s_addr = msf->imsf_interface;
2009 imr.imr_ifindex = ifindex;
2010 in_dev = ip_mc_find_dev(&imr);
2011
2012 if (!in_dev) {
2013 err = -ENODEV;
2014 goto done;
2015 }
2016
2017 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2018 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2019 leavegroup = 1;
2020 goto done;
2021 }
2022
2023 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2024 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2025 pmc->multi.imr_ifindex == imr.imr_ifindex)
2026 break;
2027 }
2028 if (!pmc) { /* must have a prior join */
2029 err = -EINVAL;
2030 goto done;
2031 }
2032 if (msf->imsf_numsrc) {
2033 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2034 GFP_KERNEL);
2035 if (!newpsl) {
2036 err = -ENOBUFS;
2037 goto done;
2038 }
2039 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2040 memcpy(newpsl->sl_addr, msf->imsf_slist,
2041 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2042 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2043 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2044 if (err) {
2045 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2046 goto done;
2047 }
2048 } else {
2049 newpsl = NULL;
2050 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2051 msf->imsf_fmode, 0, NULL, 0);
2052 }
2053 psl = pmc->sflist;
2054 if (psl) {
2055 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2056 psl->sl_count, psl->sl_addr, 0);
2057 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2058 } else
2059 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2060 0, NULL, 0);
2061 pmc->sflist = newpsl;
2062 pmc->sfmode = msf->imsf_fmode;
2063 err = 0;
2064 done:
2065 rtnl_unlock();
2066 if (leavegroup)
2067 err = ip_mc_leave_group(sk, &imr);
2068 return err;
2069 }
2070
2071 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2072 struct ip_msfilter __user *optval, int __user *optlen)
2073 {
2074 int err, len, count, copycount;
2075 struct ip_mreqn imr;
2076 __be32 addr = msf->imsf_multiaddr;
2077 struct ip_mc_socklist *pmc;
2078 struct in_device *in_dev;
2079 struct inet_sock *inet = inet_sk(sk);
2080 struct ip_sf_socklist *psl;
2081
2082 if (!MULTICAST(addr))
2083 return -EINVAL;
2084
2085 rtnl_lock();
2086
2087 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2088 imr.imr_address.s_addr = msf->imsf_interface;
2089 imr.imr_ifindex = 0;
2090 in_dev = ip_mc_find_dev(&imr);
2091
2092 if (!in_dev) {
2093 err = -ENODEV;
2094 goto done;
2095 }
2096 err = -EADDRNOTAVAIL;
2097
2098 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2099 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2100 pmc->multi.imr_ifindex == imr.imr_ifindex)
2101 break;
2102 }
2103 if (!pmc) /* must have a prior join */
2104 goto done;
2105 msf->imsf_fmode = pmc->sfmode;
2106 psl = pmc->sflist;
2107 rtnl_unlock();
2108 if (!psl) {
2109 len = 0;
2110 count = 0;
2111 } else {
2112 count = psl->sl_count;
2113 }
2114 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2115 len = copycount * sizeof(psl->sl_addr[0]);
2116 msf->imsf_numsrc = count;
2117 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2118 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2119 return -EFAULT;
2120 }
2121 if (len &&
2122 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2123 return -EFAULT;
2124 return 0;
2125 done:
2126 rtnl_unlock();
2127 return err;
2128 }
2129
2130 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2131 struct group_filter __user *optval, int __user *optlen)
2132 {
2133 int err, i, count, copycount;
2134 struct sockaddr_in *psin;
2135 __be32 addr;
2136 struct ip_mc_socklist *pmc;
2137 struct inet_sock *inet = inet_sk(sk);
2138 struct ip_sf_socklist *psl;
2139
2140 psin = (struct sockaddr_in *)&gsf->gf_group;
2141 if (psin->sin_family != AF_INET)
2142 return -EINVAL;
2143 addr = psin->sin_addr.s_addr;
2144 if (!MULTICAST(addr))
2145 return -EINVAL;
2146
2147 rtnl_lock();
2148
2149 err = -EADDRNOTAVAIL;
2150
2151 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2152 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2153 pmc->multi.imr_ifindex == gsf->gf_interface)
2154 break;
2155 }
2156 if (!pmc) /* must have a prior join */
2157 goto done;
2158 gsf->gf_fmode = pmc->sfmode;
2159 psl = pmc->sflist;
2160 rtnl_unlock();
2161 count = psl ? psl->sl_count : 0;
2162 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2163 gsf->gf_numsrc = count;
2164 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2165 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2166 return -EFAULT;
2167 }
2168 for (i=0; i<copycount; i++) {
2169 struct sockaddr_in *psin;
2170 struct sockaddr_storage ss;
2171
2172 psin = (struct sockaddr_in *)&ss;
2173 memset(&ss, 0, sizeof(ss));
2174 psin->sin_family = AF_INET;
2175 psin->sin_addr.s_addr = psl->sl_addr[i];
2176 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2177 return -EFAULT;
2178 }
2179 return 0;
2180 done:
2181 rtnl_unlock();
2182 return err;
2183 }
2184
2185 /*
2186 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2187 */
2188 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2189 {
2190 struct inet_sock *inet = inet_sk(sk);
2191 struct ip_mc_socklist *pmc;
2192 struct ip_sf_socklist *psl;
2193 int i;
2194
2195 if (!MULTICAST(loc_addr))
2196 return 1;
2197
2198 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2199 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2200 pmc->multi.imr_ifindex == dif)
2201 break;
2202 }
2203 if (!pmc)
2204 return 1;
2205 psl = pmc->sflist;
2206 if (!psl)
2207 return pmc->sfmode == MCAST_EXCLUDE;
2208
2209 for (i=0; i<psl->sl_count; i++) {
2210 if (psl->sl_addr[i] == rmt_addr)
2211 break;
2212 }
2213 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2214 return 0;
2215 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2216 return 0;
2217 return 1;
2218 }
2219
2220 /*
2221 * A socket is closing.
2222 */
2223
2224 void ip_mc_drop_socket(struct sock *sk)
2225 {
2226 struct inet_sock *inet = inet_sk(sk);
2227 struct ip_mc_socklist *iml;
2228
2229 if (inet->mc_list == NULL)
2230 return;
2231
2232 rtnl_lock();
2233 while ((iml = inet->mc_list) != NULL) {
2234 struct in_device *in_dev;
2235 inet->mc_list = iml->next;
2236
2237 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
2238 (void) ip_mc_leave_src(sk, iml, in_dev);
2239 if (in_dev != NULL) {
2240 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2241 in_dev_put(in_dev);
2242 }
2243 sock_kfree_s(sk, iml, sizeof(*iml));
2244 }
2245 rtnl_unlock();
2246 }
2247
2248 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2249 {
2250 struct ip_mc_list *im;
2251 struct ip_sf_list *psf;
2252 int rv = 0;
2253
2254 read_lock(&in_dev->mc_list_lock);
2255 for (im=in_dev->mc_list; im; im=im->next) {
2256 if (im->multiaddr == mc_addr)
2257 break;
2258 }
2259 if (im && proto == IPPROTO_IGMP) {
2260 rv = 1;
2261 } else if (im) {
2262 if (src_addr) {
2263 for (psf=im->sources; psf; psf=psf->sf_next) {
2264 if (psf->sf_inaddr == src_addr)
2265 break;
2266 }
2267 if (psf)
2268 rv = psf->sf_count[MCAST_INCLUDE] ||
2269 psf->sf_count[MCAST_EXCLUDE] !=
2270 im->sfcount[MCAST_EXCLUDE];
2271 else
2272 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2273 } else
2274 rv = 1; /* unspecified source; tentatively allow */
2275 }
2276 read_unlock(&in_dev->mc_list_lock);
2277 return rv;
2278 }
2279
2280 #if defined(CONFIG_PROC_FS)
2281 struct igmp_mc_iter_state {
2282 struct net_device *dev;
2283 struct in_device *in_dev;
2284 };
2285
2286 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2287
2288 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2289 {
2290 struct ip_mc_list *im = NULL;
2291 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2292
2293 state->in_dev = NULL;
2294 for_each_netdev(state->dev) {
2295 struct in_device *in_dev;
2296 in_dev = in_dev_get(state->dev);
2297 if (!in_dev)
2298 continue;
2299 read_lock(&in_dev->mc_list_lock);
2300 im = in_dev->mc_list;
2301 if (im) {
2302 state->in_dev = in_dev;
2303 break;
2304 }
2305 read_unlock(&in_dev->mc_list_lock);
2306 in_dev_put(in_dev);
2307 }
2308 return im;
2309 }
2310
2311 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2312 {
2313 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2314 im = im->next;
2315 while (!im) {
2316 if (likely(state->in_dev != NULL)) {
2317 read_unlock(&state->in_dev->mc_list_lock);
2318 in_dev_put(state->in_dev);
2319 }
2320 state->dev = next_net_device(state->dev);
2321 if (!state->dev) {
2322 state->in_dev = NULL;
2323 break;
2324 }
2325 state->in_dev = in_dev_get(state->dev);
2326 if (!state->in_dev)
2327 continue;
2328 read_lock(&state->in_dev->mc_list_lock);
2329 im = state->in_dev->mc_list;
2330 }
2331 return im;
2332 }
2333
2334 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2335 {
2336 struct ip_mc_list *im = igmp_mc_get_first(seq);
2337 if (im)
2338 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2339 --pos;
2340 return pos ? NULL : im;
2341 }
2342
2343 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2344 {
2345 read_lock(&dev_base_lock);
2346 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2347 }
2348
2349 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2350 {
2351 struct ip_mc_list *im;
2352 if (v == SEQ_START_TOKEN)
2353 im = igmp_mc_get_first(seq);
2354 else
2355 im = igmp_mc_get_next(seq, v);
2356 ++*pos;
2357 return im;
2358 }
2359
2360 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2361 {
2362 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2363 if (likely(state->in_dev != NULL)) {
2364 read_unlock(&state->in_dev->mc_list_lock);
2365 in_dev_put(state->in_dev);
2366 state->in_dev = NULL;
2367 }
2368 state->dev = NULL;
2369 read_unlock(&dev_base_lock);
2370 }
2371
2372 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2373 {
2374 if (v == SEQ_START_TOKEN)
2375 seq_puts(seq,
2376 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2377 else {
2378 struct ip_mc_list *im = (struct ip_mc_list *)v;
2379 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2380 char *querier;
2381 #ifdef CONFIG_IP_MULTICAST
2382 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2383 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2384 "V3";
2385 #else
2386 querier = "NONE";
2387 #endif
2388
2389 if (state->in_dev->mc_list == im) {
2390 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2391 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2392 }
2393
2394 seq_printf(seq,
2395 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2396 im->multiaddr, im->users,
2397 im->tm_running, im->tm_running ?
2398 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2399 im->reporter);
2400 }
2401 return 0;
2402 }
2403
2404 static const struct seq_operations igmp_mc_seq_ops = {
2405 .start = igmp_mc_seq_start,
2406 .next = igmp_mc_seq_next,
2407 .stop = igmp_mc_seq_stop,
2408 .show = igmp_mc_seq_show,
2409 };
2410
2411 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2412 {
2413 struct seq_file *seq;
2414 int rc = -ENOMEM;
2415 struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2416
2417 if (!s)
2418 goto out;
2419 rc = seq_open(file, &igmp_mc_seq_ops);
2420 if (rc)
2421 goto out_kfree;
2422
2423 seq = file->private_data;
2424 seq->private = s;
2425 out:
2426 return rc;
2427 out_kfree:
2428 kfree(s);
2429 goto out;
2430 }
2431
2432 static const struct file_operations igmp_mc_seq_fops = {
2433 .owner = THIS_MODULE,
2434 .open = igmp_mc_seq_open,
2435 .read = seq_read,
2436 .llseek = seq_lseek,
2437 .release = seq_release_private,
2438 };
2439
2440 struct igmp_mcf_iter_state {
2441 struct net_device *dev;
2442 struct in_device *idev;
2443 struct ip_mc_list *im;
2444 };
2445
2446 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2447
2448 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2449 {
2450 struct ip_sf_list *psf = NULL;
2451 struct ip_mc_list *im = NULL;
2452 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2453
2454 state->idev = NULL;
2455 state->im = NULL;
2456 for_each_netdev(state->dev) {
2457 struct in_device *idev;
2458 idev = in_dev_get(state->dev);
2459 if (unlikely(idev == NULL))
2460 continue;
2461 read_lock(&idev->mc_list_lock);
2462 im = idev->mc_list;
2463 if (likely(im != NULL)) {
2464 spin_lock_bh(&im->lock);
2465 psf = im->sources;
2466 if (likely(psf != NULL)) {
2467 state->im = im;
2468 state->idev = idev;
2469 break;
2470 }
2471 spin_unlock_bh(&im->lock);
2472 }
2473 read_unlock(&idev->mc_list_lock);
2474 in_dev_put(idev);
2475 }
2476 return psf;
2477 }
2478
2479 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2480 {
2481 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2482
2483 psf = psf->sf_next;
2484 while (!psf) {
2485 spin_unlock_bh(&state->im->lock);
2486 state->im = state->im->next;
2487 while (!state->im) {
2488 if (likely(state->idev != NULL)) {
2489 read_unlock(&state->idev->mc_list_lock);
2490 in_dev_put(state->idev);
2491 }
2492 state->dev = next_net_device(state->dev);
2493 if (!state->dev) {
2494 state->idev = NULL;
2495 goto out;
2496 }
2497 state->idev = in_dev_get(state->dev);
2498 if (!state->idev)
2499 continue;
2500 read_lock(&state->idev->mc_list_lock);
2501 state->im = state->idev->mc_list;
2502 }
2503 if (!state->im)
2504 break;
2505 spin_lock_bh(&state->im->lock);
2506 psf = state->im->sources;
2507 }
2508 out:
2509 return psf;
2510 }
2511
2512 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2513 {
2514 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2515 if (psf)
2516 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2517 --pos;
2518 return pos ? NULL : psf;
2519 }
2520
2521 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2522 {
2523 read_lock(&dev_base_lock);
2524 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2525 }
2526
2527 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2528 {
2529 struct ip_sf_list *psf;
2530 if (v == SEQ_START_TOKEN)
2531 psf = igmp_mcf_get_first(seq);
2532 else
2533 psf = igmp_mcf_get_next(seq, v);
2534 ++*pos;
2535 return psf;
2536 }
2537
2538 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2539 {
2540 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2541 if (likely(state->im != NULL)) {
2542 spin_unlock_bh(&state->im->lock);
2543 state->im = NULL;
2544 }
2545 if (likely(state->idev != NULL)) {
2546 read_unlock(&state->idev->mc_list_lock);
2547 in_dev_put(state->idev);
2548 state->idev = NULL;
2549 }
2550 state->dev = NULL;
2551 read_unlock(&dev_base_lock);
2552 }
2553
2554 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2555 {
2556 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2557 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2558
2559 if (v == SEQ_START_TOKEN) {
2560 seq_printf(seq,
2561 "%3s %6s "
2562 "%10s %10s %6s %6s\n", "Idx",
2563 "Device", "MCA",
2564 "SRC", "INC", "EXC");
2565 } else {
2566 seq_printf(seq,
2567 "%3d %6.6s 0x%08x "
2568 "0x%08x %6lu %6lu\n",
2569 state->dev->ifindex, state->dev->name,
2570 ntohl(state->im->multiaddr),
2571 ntohl(psf->sf_inaddr),
2572 psf->sf_count[MCAST_INCLUDE],
2573 psf->sf_count[MCAST_EXCLUDE]);
2574 }
2575 return 0;
2576 }
2577
2578 static const struct seq_operations igmp_mcf_seq_ops = {
2579 .start = igmp_mcf_seq_start,
2580 .next = igmp_mcf_seq_next,
2581 .stop = igmp_mcf_seq_stop,
2582 .show = igmp_mcf_seq_show,
2583 };
2584
2585 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2586 {
2587 struct seq_file *seq;
2588 int rc = -ENOMEM;
2589 struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2590
2591 if (!s)
2592 goto out;
2593 rc = seq_open(file, &igmp_mcf_seq_ops);
2594 if (rc)
2595 goto out_kfree;
2596
2597 seq = file->private_data;
2598 seq->private = s;
2599 out:
2600 return rc;
2601 out_kfree:
2602 kfree(s);
2603 goto out;
2604 }
2605
2606 static const struct file_operations igmp_mcf_seq_fops = {
2607 .owner = THIS_MODULE,
2608 .open = igmp_mcf_seq_open,
2609 .read = seq_read,
2610 .llseek = seq_lseek,
2611 .release = seq_release_private,
2612 };
2613
2614 int __init igmp_mc_proc_init(void)
2615 {
2616 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2617 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2618 return 0;
2619 }
2620 #endif
2621
2622 EXPORT_SYMBOL(ip_mc_dec_group);
2623 EXPORT_SYMBOL(ip_mc_inc_group);
2624 EXPORT_SYMBOL(ip_mc_join_group);
2625 EXPORT_SYMBOL(ip_mc_rejoin_group);
USB Experimental Work