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Linux 3.8-rc7
[cris-mirror.git] / net / ipv4 / igmp.c
blob736ab70fd17981c95085ee0fad163aaeca39133c
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 * Authors:
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
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
36 * The enhancements are mainly based on Steve Deering's
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
50 * memberships but was being deleted,
51 * which caused a "del_timer() called
52 * from %p with timer not initialized\n"
53 * message (960131).
54 * Christian Daudt : removed del_timer from
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
73 #include <linux/module.h>
74 #include <linux/slab.h>
75 #include <asm/uaccess.h>
76 #include <linux/types.h>
77 #include <linux/kernel.h>
78 #include <linux/jiffies.h>
79 #include <linux/string.h>
80 #include <linux/socket.h>
81 #include <linux/sockios.h>
82 #include <linux/in.h>
83 #include <linux/inet.h>
84 #include <linux/netdevice.h>
85 #include <linux/skbuff.h>
86 #include <linux/inetdevice.h>
87 #include <linux/igmp.h>
88 #include <linux/if_arp.h>
89 #include <linux/rtnetlink.h>
90 #include <linux/times.h>
91
92 #include <net/net_namespace.h>
93 #include <net/arp.h>
94 #include <net/ip.h>
95 #include <net/protocol.h>
96 #include <net/route.h>
97 #include <net/sock.h>
98 #include <net/checksum.h>
99 #include <linux/netfilter_ipv4.h>
100 #ifdef CONFIG_IP_MROUTE
101 #include <linux/mroute.h>
102 #endif
103 #ifdef CONFIG_PROC_FS
104 #include <linux/proc_fs.h>
105 #include <linux/seq_file.h>
106 #endif
107
108 #define IP_MAX_MEMBERSHIPS 20
109 #define IP_MAX_MSF 10
110
111 #ifdef CONFIG_IP_MULTICAST
112 /* Parameter names and values are taken from igmp-v2-06 draft */
113
114 #define IGMP_V1_Router_Present_Timeout (400*HZ)
115 #define IGMP_V2_Router_Present_Timeout (400*HZ)
116 #define IGMP_Unsolicited_Report_Interval (10*HZ)
117 #define IGMP_Query_Response_Interval (10*HZ)
118 #define IGMP_Unsolicited_Report_Count 2
119
120
121 #define IGMP_Initial_Report_Delay (1)
122
123 /* IGMP_Initial_Report_Delay is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
128 */
129
130 #define IGMP_V1_SEEN(in_dev) \
131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135 #define IGMP_V2_SEEN(in_dev) \
136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
140
141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
143 static void igmpv3_clear_delrec(struct in_device *in_dev);
144 static int sf_setstate(struct ip_mc_list *pmc);
145 static void sf_markstate(struct ip_mc_list *pmc);
146 #endif
147 static void ip_mc_clear_src(struct ip_mc_list *pmc);
148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
149 int sfcount, __be32 *psfsrc, int delta);
150
151 static void ip_ma_put(struct ip_mc_list *im)
152 {
153 if (atomic_dec_and_test(&im->refcnt)) {
154 in_dev_put(im->interface);
155 kfree_rcu(im, rcu);
156 }
157 }
158
159 #define for_each_pmc_rcu(in_dev, pmc) \
160 for (pmc = rcu_dereference(in_dev->mc_list); \
161 pmc != NULL; \
162 pmc = rcu_dereference(pmc->next_rcu))
163
164 #define for_each_pmc_rtnl(in_dev, pmc) \
165 for (pmc = rtnl_dereference(in_dev->mc_list); \
166 pmc != NULL; \
167 pmc = rtnl_dereference(pmc->next_rcu))
168
169 #ifdef CONFIG_IP_MULTICAST
170
171 /*
172 * Timer management
173 */
174
175 static void igmp_stop_timer(struct ip_mc_list *im)
176 {
177 spin_lock_bh(&im->lock);
178 if (del_timer(&im->timer))
179 atomic_dec(&im->refcnt);
180 im->tm_running = 0;
181 im->reporter = 0;
182 im->unsolicit_count = 0;
183 spin_unlock_bh(&im->lock);
184 }
185
186 /* It must be called with locked im->lock */
187 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
188 {
189 int tv = net_random() % max_delay;
190
191 im->tm_running = 1;
192 if (!mod_timer(&im->timer, jiffies+tv+2))
193 atomic_inc(&im->refcnt);
194 }
195
196 static void igmp_gq_start_timer(struct in_device *in_dev)
197 {
198 int tv = net_random() % in_dev->mr_maxdelay;
199
200 in_dev->mr_gq_running = 1;
201 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
202 in_dev_hold(in_dev);
203 }
204
205 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
206 {
207 int tv = net_random() % delay;
208
209 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
210 in_dev_hold(in_dev);
211 }
212
213 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
214 {
215 spin_lock_bh(&im->lock);
216 im->unsolicit_count = 0;
217 if (del_timer(&im->timer)) {
218 if ((long)(im->timer.expires-jiffies) < max_delay) {
219 add_timer(&im->timer);
220 im->tm_running = 1;
221 spin_unlock_bh(&im->lock);
222 return;
223 }
224 atomic_dec(&im->refcnt);
225 }
226 igmp_start_timer(im, max_delay);
227 spin_unlock_bh(&im->lock);
228 }
229
230
231 /*
232 * Send an IGMP report.
233 */
234
235 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
236
237
238 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
239 int gdeleted, int sdeleted)
240 {
241 switch (type) {
242 case IGMPV3_MODE_IS_INCLUDE:
243 case IGMPV3_MODE_IS_EXCLUDE:
244 if (gdeleted || sdeleted)
245 return 0;
246 if (!(pmc->gsquery && !psf->sf_gsresp)) {
247 if (pmc->sfmode == MCAST_INCLUDE)
248 return 1;
249 /* don't include if this source is excluded
250 * in all filters
251 */
252 if (psf->sf_count[MCAST_INCLUDE])
253 return type == IGMPV3_MODE_IS_INCLUDE;
254 return pmc->sfcount[MCAST_EXCLUDE] ==
255 psf->sf_count[MCAST_EXCLUDE];
256 }
257 return 0;
258 case IGMPV3_CHANGE_TO_INCLUDE:
259 if (gdeleted || sdeleted)
260 return 0;
261 return psf->sf_count[MCAST_INCLUDE] != 0;
262 case IGMPV3_CHANGE_TO_EXCLUDE:
263 if (gdeleted || sdeleted)
264 return 0;
265 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
266 psf->sf_count[MCAST_INCLUDE])
267 return 0;
268 return pmc->sfcount[MCAST_EXCLUDE] ==
269 psf->sf_count[MCAST_EXCLUDE];
270 case IGMPV3_ALLOW_NEW_SOURCES:
271 if (gdeleted || !psf->sf_crcount)
272 return 0;
273 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
274 case IGMPV3_BLOCK_OLD_SOURCES:
275 if (pmc->sfmode == MCAST_INCLUDE)
276 return gdeleted || (psf->sf_crcount && sdeleted);
277 return psf->sf_crcount && !gdeleted && !sdeleted;
278 }
279 return 0;
280 }
281
282 static int
283 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
284 {
285 struct ip_sf_list *psf;
286 int scount = 0;
287
288 for (psf=pmc->sources; psf; psf=psf->sf_next) {
289 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
290 continue;
291 scount++;
292 }
293 return scount;
294 }
295
296 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
297
298 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
299 {
300 struct sk_buff *skb;
301 struct rtable *rt;
302 struct iphdr *pip;
303 struct igmpv3_report *pig;
304 struct net *net = dev_net(dev);
305 struct flowi4 fl4;
306 int hlen = LL_RESERVED_SPACE(dev);
307 int tlen = dev->needed_tailroom;
308
309 while (1) {
310 skb = alloc_skb(size + hlen + tlen,
311 GFP_ATOMIC | __GFP_NOWARN);
312 if (skb)
313 break;
314 size >>= 1;
315 if (size < 256)
316 return NULL;
317 }
318 igmp_skb_size(skb) = size;
319
320 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
321 0, 0,
322 IPPROTO_IGMP, 0, dev->ifindex);
323 if (IS_ERR(rt)) {
324 kfree_skb(skb);
325 return NULL;
326 }
327
328 skb_dst_set(skb, &rt->dst);
329 skb->dev = dev;
330
331 skb_reserve(skb, hlen);
332
333 skb_reset_network_header(skb);
334 pip = ip_hdr(skb);
335 skb_put(skb, sizeof(struct iphdr) + 4);
336
337 pip->version = 4;
338 pip->ihl = (sizeof(struct iphdr)+4)>>2;
339 pip->tos = 0xc0;
340 pip->frag_off = htons(IP_DF);
341 pip->ttl = 1;
342 pip->daddr = fl4.daddr;
343 pip->saddr = fl4.saddr;
344 pip->protocol = IPPROTO_IGMP;
345 pip->tot_len = 0; /* filled in later */
346 ip_select_ident(pip, &rt->dst, NULL);
347 ((u8 *)&pip[1])[0] = IPOPT_RA;
348 ((u8 *)&pip[1])[1] = 4;
349 ((u8 *)&pip[1])[2] = 0;
350 ((u8 *)&pip[1])[3] = 0;
351
352 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
353 skb_put(skb, sizeof(*pig));
354 pig = igmpv3_report_hdr(skb);
355 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
356 pig->resv1 = 0;
357 pig->csum = 0;
358 pig->resv2 = 0;
359 pig->ngrec = 0;
360 return skb;
361 }
362
363 static int igmpv3_sendpack(struct sk_buff *skb)
364 {
365 struct igmphdr *pig = igmp_hdr(skb);
366 const int igmplen = skb->tail - skb->transport_header;
367
368 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
369
370 return ip_local_out(skb);
371 }
372
373 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
374 {
375 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
376 }
377
378 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
379 int type, struct igmpv3_grec **ppgr)
380 {
381 struct net_device *dev = pmc->interface->dev;
382 struct igmpv3_report *pih;
383 struct igmpv3_grec *pgr;
384
385 if (!skb)
386 skb = igmpv3_newpack(dev, dev->mtu);
387 if (!skb)
388 return NULL;
389 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
390 pgr->grec_type = type;
391 pgr->grec_auxwords = 0;
392 pgr->grec_nsrcs = 0;
393 pgr->grec_mca = pmc->multiaddr;
394 pih = igmpv3_report_hdr(skb);
395 pih->ngrec = htons(ntohs(pih->ngrec)+1);
396 *ppgr = pgr;
397 return skb;
398 }
399
400 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
401 skb_tailroom(skb)) : 0)
402
403 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
404 int type, int gdeleted, int sdeleted)
405 {
406 struct net_device *dev = pmc->interface->dev;
407 struct igmpv3_report *pih;
408 struct igmpv3_grec *pgr = NULL;
409 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
410 int scount, stotal, first, isquery, truncate;
411
412 if (pmc->multiaddr == IGMP_ALL_HOSTS)
413 return skb;
414
415 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
416 type == IGMPV3_MODE_IS_EXCLUDE;
417 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
418 type == IGMPV3_CHANGE_TO_EXCLUDE;
419
420 stotal = scount = 0;
421
422 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
423
424 if (!*psf_list)
425 goto empty_source;
426
427 pih = skb ? igmpv3_report_hdr(skb) : NULL;
428
429 /* EX and TO_EX get a fresh packet, if needed */
430 if (truncate) {
431 if (pih && pih->ngrec &&
432 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
433 if (skb)
434 igmpv3_sendpack(skb);
435 skb = igmpv3_newpack(dev, dev->mtu);
436 }
437 }
438 first = 1;
439 psf_prev = NULL;
440 for (psf=*psf_list; psf; psf=psf_next) {
441 __be32 *psrc;
442
443 psf_next = psf->sf_next;
444
445 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
446 psf_prev = psf;
447 continue;
448 }
449
450 /* clear marks on query responses */
451 if (isquery)
452 psf->sf_gsresp = 0;
453
454 if (AVAILABLE(skb) < sizeof(__be32) +
455 first*sizeof(struct igmpv3_grec)) {
456 if (truncate && !first)
457 break; /* truncate these */
458 if (pgr)
459 pgr->grec_nsrcs = htons(scount);
460 if (skb)
461 igmpv3_sendpack(skb);
462 skb = igmpv3_newpack(dev, dev->mtu);
463 first = 1;
464 scount = 0;
465 }
466 if (first) {
467 skb = add_grhead(skb, pmc, type, &pgr);
468 first = 0;
469 }
470 if (!skb)
471 return NULL;
472 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
473 *psrc = psf->sf_inaddr;
474 scount++; stotal++;
475 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
476 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
477 psf->sf_crcount--;
478 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
479 if (psf_prev)
480 psf_prev->sf_next = psf->sf_next;
481 else
482 *psf_list = psf->sf_next;
483 kfree(psf);
484 continue;
485 }
486 }
487 psf_prev = psf;
488 }
489
490 empty_source:
491 if (!stotal) {
492 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
493 type == IGMPV3_BLOCK_OLD_SOURCES)
494 return skb;
495 if (pmc->crcount || isquery) {
496 /* make sure we have room for group header */
497 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
498 igmpv3_sendpack(skb);
499 skb = NULL; /* add_grhead will get a new one */
500 }
501 skb = add_grhead(skb, pmc, type, &pgr);
502 }
503 }
504 if (pgr)
505 pgr->grec_nsrcs = htons(scount);
506
507 if (isquery)
508 pmc->gsquery = 0; /* clear query state on report */
509 return skb;
510 }
511
512 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
513 {
514 struct sk_buff *skb = NULL;
515 int type;
516
517 if (!pmc) {
518 rcu_read_lock();
519 for_each_pmc_rcu(in_dev, pmc) {
520 if (pmc->multiaddr == IGMP_ALL_HOSTS)
521 continue;
522 spin_lock_bh(&pmc->lock);
523 if (pmc->sfcount[MCAST_EXCLUDE])
524 type = IGMPV3_MODE_IS_EXCLUDE;
525 else
526 type = IGMPV3_MODE_IS_INCLUDE;
527 skb = add_grec(skb, pmc, type, 0, 0);
528 spin_unlock_bh(&pmc->lock);
529 }
530 rcu_read_unlock();
531 } else {
532 spin_lock_bh(&pmc->lock);
533 if (pmc->sfcount[MCAST_EXCLUDE])
534 type = IGMPV3_MODE_IS_EXCLUDE;
535 else
536 type = IGMPV3_MODE_IS_INCLUDE;
537 skb = add_grec(skb, pmc, type, 0, 0);
538 spin_unlock_bh(&pmc->lock);
539 }
540 if (!skb)
541 return 0;
542 return igmpv3_sendpack(skb);
543 }
544
545 /*
546 * remove zero-count source records from a source filter list
547 */
548 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
549 {
550 struct ip_sf_list *psf_prev, *psf_next, *psf;
551
552 psf_prev = NULL;
553 for (psf=*ppsf; psf; psf = psf_next) {
554 psf_next = psf->sf_next;
555 if (psf->sf_crcount == 0) {
556 if (psf_prev)
557 psf_prev->sf_next = psf->sf_next;
558 else
559 *ppsf = psf->sf_next;
560 kfree(psf);
561 } else
562 psf_prev = psf;
563 }
564 }
565
566 static void igmpv3_send_cr(struct in_device *in_dev)
567 {
568 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
569 struct sk_buff *skb = NULL;
570 int type, dtype;
571
572 rcu_read_lock();
573 spin_lock_bh(&in_dev->mc_tomb_lock);
574
575 /* deleted MCA's */
576 pmc_prev = NULL;
577 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
578 pmc_next = pmc->next;
579 if (pmc->sfmode == MCAST_INCLUDE) {
580 type = IGMPV3_BLOCK_OLD_SOURCES;
581 dtype = IGMPV3_BLOCK_OLD_SOURCES;
582 skb = add_grec(skb, pmc, type, 1, 0);
583 skb = add_grec(skb, pmc, dtype, 1, 1);
584 }
585 if (pmc->crcount) {
586 if (pmc->sfmode == MCAST_EXCLUDE) {
587 type = IGMPV3_CHANGE_TO_INCLUDE;
588 skb = add_grec(skb, pmc, type, 1, 0);
589 }
590 pmc->crcount--;
591 if (pmc->crcount == 0) {
592 igmpv3_clear_zeros(&pmc->tomb);
593 igmpv3_clear_zeros(&pmc->sources);
594 }
595 }
596 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
597 if (pmc_prev)
598 pmc_prev->next = pmc_next;
599 else
600 in_dev->mc_tomb = pmc_next;
601 in_dev_put(pmc->interface);
602 kfree(pmc);
603 } else
604 pmc_prev = pmc;
605 }
606 spin_unlock_bh(&in_dev->mc_tomb_lock);
607
608 /* change recs */
609 for_each_pmc_rcu(in_dev, pmc) {
610 spin_lock_bh(&pmc->lock);
611 if (pmc->sfcount[MCAST_EXCLUDE]) {
612 type = IGMPV3_BLOCK_OLD_SOURCES;
613 dtype = IGMPV3_ALLOW_NEW_SOURCES;
614 } else {
615 type = IGMPV3_ALLOW_NEW_SOURCES;
616 dtype = IGMPV3_BLOCK_OLD_SOURCES;
617 }
618 skb = add_grec(skb, pmc, type, 0, 0);
619 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
620
621 /* filter mode changes */
622 if (pmc->crcount) {
623 if (pmc->sfmode == MCAST_EXCLUDE)
624 type = IGMPV3_CHANGE_TO_EXCLUDE;
625 else
626 type = IGMPV3_CHANGE_TO_INCLUDE;
627 skb = add_grec(skb, pmc, type, 0, 0);
628 pmc->crcount--;
629 }
630 spin_unlock_bh(&pmc->lock);
631 }
632 rcu_read_unlock();
633
634 if (!skb)
635 return;
636 (void) igmpv3_sendpack(skb);
637 }
638
639 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
640 int type)
641 {
642 struct sk_buff *skb;
643 struct iphdr *iph;
644 struct igmphdr *ih;
645 struct rtable *rt;
646 struct net_device *dev = in_dev->dev;
647 struct net *net = dev_net(dev);
648 __be32 group = pmc ? pmc->multiaddr : 0;
649 struct flowi4 fl4;
650 __be32 dst;
651 int hlen, tlen;
652
653 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
654 return igmpv3_send_report(in_dev, pmc);
655 else if (type == IGMP_HOST_LEAVE_MESSAGE)
656 dst = IGMP_ALL_ROUTER;
657 else
658 dst = group;
659
660 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
661 0, 0,
662 IPPROTO_IGMP, 0, dev->ifindex);
663 if (IS_ERR(rt))
664 return -1;
665
666 hlen = LL_RESERVED_SPACE(dev);
667 tlen = dev->needed_tailroom;
668 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
669 if (skb == NULL) {
670 ip_rt_put(rt);
671 return -1;
672 }
673
674 skb_dst_set(skb, &rt->dst);
675
676 skb_reserve(skb, hlen);
677
678 skb_reset_network_header(skb);
679 iph = ip_hdr(skb);
680 skb_put(skb, sizeof(struct iphdr) + 4);
681
682 iph->version = 4;
683 iph->ihl = (sizeof(struct iphdr)+4)>>2;
684 iph->tos = 0xc0;
685 iph->frag_off = htons(IP_DF);
686 iph->ttl = 1;
687 iph->daddr = dst;
688 iph->saddr = fl4.saddr;
689 iph->protocol = IPPROTO_IGMP;
690 ip_select_ident(iph, &rt->dst, NULL);
691 ((u8 *)&iph[1])[0] = IPOPT_RA;
692 ((u8 *)&iph[1])[1] = 4;
693 ((u8 *)&iph[1])[2] = 0;
694 ((u8 *)&iph[1])[3] = 0;
695
696 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
697 ih->type = type;
698 ih->code = 0;
699 ih->csum = 0;
700 ih->group = group;
701 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
702
703 return ip_local_out(skb);
704 }
705
706 static void igmp_gq_timer_expire(unsigned long data)
707 {
708 struct in_device *in_dev = (struct in_device *)data;
709
710 in_dev->mr_gq_running = 0;
711 igmpv3_send_report(in_dev, NULL);
712 __in_dev_put(in_dev);
713 }
714
715 static void igmp_ifc_timer_expire(unsigned long data)
716 {
717 struct in_device *in_dev = (struct in_device *)data;
718
719 igmpv3_send_cr(in_dev);
720 if (in_dev->mr_ifc_count) {
721 in_dev->mr_ifc_count--;
722 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
723 }
724 __in_dev_put(in_dev);
725 }
726
727 static void igmp_ifc_event(struct in_device *in_dev)
728 {
729 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
730 return;
731 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
732 IGMP_Unsolicited_Report_Count;
733 igmp_ifc_start_timer(in_dev, 1);
734 }
735
736
737 static void igmp_timer_expire(unsigned long data)
738 {
739 struct ip_mc_list *im=(struct ip_mc_list *)data;
740 struct in_device *in_dev = im->interface;
741
742 spin_lock(&im->lock);
743 im->tm_running = 0;
744
745 if (im->unsolicit_count) {
746 im->unsolicit_count--;
747 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
748 }
749 im->reporter = 1;
750 spin_unlock(&im->lock);
751
752 if (IGMP_V1_SEEN(in_dev))
753 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
754 else if (IGMP_V2_SEEN(in_dev))
755 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
756 else
757 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
758
759 ip_ma_put(im);
760 }
761
762 /* mark EXCLUDE-mode sources */
763 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
764 {
765 struct ip_sf_list *psf;
766 int i, scount;
767
768 scount = 0;
769 for (psf=pmc->sources; psf; psf=psf->sf_next) {
770 if (scount == nsrcs)
771 break;
772 for (i=0; i<nsrcs; i++) {
773 /* skip inactive filters */
774 if (psf->sf_count[MCAST_INCLUDE] ||
775 pmc->sfcount[MCAST_EXCLUDE] !=
776 psf->sf_count[MCAST_EXCLUDE])
777 break;
778 if (srcs[i] == psf->sf_inaddr) {
779 scount++;
780 break;
781 }
782 }
783 }
784 pmc->gsquery = 0;
785 if (scount == nsrcs) /* all sources excluded */
786 return 0;
787 return 1;
788 }
789
790 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
791 {
792 struct ip_sf_list *psf;
793 int i, scount;
794
795 if (pmc->sfmode == MCAST_EXCLUDE)
796 return igmp_xmarksources(pmc, nsrcs, srcs);
797
798 /* mark INCLUDE-mode sources */
799 scount = 0;
800 for (psf=pmc->sources; psf; psf=psf->sf_next) {
801 if (scount == nsrcs)
802 break;
803 for (i=0; i<nsrcs; i++)
804 if (srcs[i] == psf->sf_inaddr) {
805 psf->sf_gsresp = 1;
806 scount++;
807 break;
808 }
809 }
810 if (!scount) {
811 pmc->gsquery = 0;
812 return 0;
813 }
814 pmc->gsquery = 1;
815 return 1;
816 }
817
818 /* return true if packet was dropped */
819 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
820 {
821 struct ip_mc_list *im;
822
823 /* Timers are only set for non-local groups */
824
825 if (group == IGMP_ALL_HOSTS)
826 return false;
827
828 rcu_read_lock();
829 for_each_pmc_rcu(in_dev, im) {
830 if (im->multiaddr == group) {
831 igmp_stop_timer(im);
832 break;
833 }
834 }
835 rcu_read_unlock();
836 return false;
837 }
838
839 /* return true if packet was dropped */
840 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
841 int len)
842 {
843 struct igmphdr *ih = igmp_hdr(skb);
844 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
845 struct ip_mc_list *im;
846 __be32 group = ih->group;
847 int max_delay;
848 int mark = 0;
849
850
851 if (len == 8) {
852 if (ih->code == 0) {
853 /* Alas, old v1 router presents here. */
854
855 max_delay = IGMP_Query_Response_Interval;
856 in_dev->mr_v1_seen = jiffies +
857 IGMP_V1_Router_Present_Timeout;
858 group = 0;
859 } else {
860 /* v2 router present */
861 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
862 in_dev->mr_v2_seen = jiffies +
863 IGMP_V2_Router_Present_Timeout;
864 }
865 /* cancel the interface change timer */
866 in_dev->mr_ifc_count = 0;
867 if (del_timer(&in_dev->mr_ifc_timer))
868 __in_dev_put(in_dev);
869 /* clear deleted report items */
870 igmpv3_clear_delrec(in_dev);
871 } else if (len < 12) {
872 return true; /* ignore bogus packet; freed by caller */
873 } else if (IGMP_V1_SEEN(in_dev)) {
874 /* This is a v3 query with v1 queriers present */
875 max_delay = IGMP_Query_Response_Interval;
876 group = 0;
877 } else if (IGMP_V2_SEEN(in_dev)) {
878 /* this is a v3 query with v2 queriers present;
879 * Interpretation of the max_delay code is problematic here.
880 * A real v2 host would use ih_code directly, while v3 has a
881 * different encoding. We use the v3 encoding as more likely
882 * to be intended in a v3 query.
883 */
884 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
885 if (!max_delay)
886 max_delay = 1; /* can't mod w/ 0 */
887 } else { /* v3 */
888 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
889 return true;
890
891 ih3 = igmpv3_query_hdr(skb);
892 if (ih3->nsrcs) {
893 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
894 + ntohs(ih3->nsrcs)*sizeof(__be32)))
895 return true;
896 ih3 = igmpv3_query_hdr(skb);
897 }
898
899 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
900 if (!max_delay)
901 max_delay = 1; /* can't mod w/ 0 */
902 in_dev->mr_maxdelay = max_delay;
903 if (ih3->qrv)
904 in_dev->mr_qrv = ih3->qrv;
905 if (!group) { /* general query */
906 if (ih3->nsrcs)
907 return false; /* no sources allowed */
908 igmp_gq_start_timer(in_dev);
909 return false;
910 }
911 /* mark sources to include, if group & source-specific */
912 mark = ih3->nsrcs != 0;
913 }
914
915 /*
916 * - Start the timers in all of our membership records
917 * that the query applies to for the interface on
918 * which the query arrived excl. those that belong
919 * to a "local" group (224.0.0.X)
920 * - For timers already running check if they need to
921 * be reset.
922 * - Use the igmp->igmp_code field as the maximum
923 * delay possible
924 */
925 rcu_read_lock();
926 for_each_pmc_rcu(in_dev, im) {
927 int changed;
928
929 if (group && group != im->multiaddr)
930 continue;
931 if (im->multiaddr == IGMP_ALL_HOSTS)
932 continue;
933 spin_lock_bh(&im->lock);
934 if (im->tm_running)
935 im->gsquery = im->gsquery && mark;
936 else
937 im->gsquery = mark;
938 changed = !im->gsquery ||
939 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
940 spin_unlock_bh(&im->lock);
941 if (changed)
942 igmp_mod_timer(im, max_delay);
943 }
944 rcu_read_unlock();
945 return false;
946 }
947
948 /* called in rcu_read_lock() section */
949 int igmp_rcv(struct sk_buff *skb)
950 {
951 /* This basically follows the spec line by line -- see RFC1112 */
952 struct igmphdr *ih;
953 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
954 int len = skb->len;
955 bool dropped = true;
956
957 if (in_dev == NULL)
958 goto drop;
959
960 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
961 goto drop;
962
963 switch (skb->ip_summed) {
964 case CHECKSUM_COMPLETE:
965 if (!csum_fold(skb->csum))
966 break;
967 /* fall through */
968 case CHECKSUM_NONE:
969 skb->csum = 0;
970 if (__skb_checksum_complete(skb))
971 goto drop;
972 }
973
974 ih = igmp_hdr(skb);
975 switch (ih->type) {
976 case IGMP_HOST_MEMBERSHIP_QUERY:
977 dropped = igmp_heard_query(in_dev, skb, len);
978 break;
979 case IGMP_HOST_MEMBERSHIP_REPORT:
980 case IGMPV2_HOST_MEMBERSHIP_REPORT:
981 /* Is it our report looped back? */
982 if (rt_is_output_route(skb_rtable(skb)))
983 break;
984 /* don't rely on MC router hearing unicast reports */
985 if (skb->pkt_type == PACKET_MULTICAST ||
986 skb->pkt_type == PACKET_BROADCAST)
987 dropped = igmp_heard_report(in_dev, ih->group);
988 break;
989 case IGMP_PIM:
990 #ifdef CONFIG_IP_PIMSM_V1
991 return pim_rcv_v1(skb);
992 #endif
993 case IGMPV3_HOST_MEMBERSHIP_REPORT:
994 case IGMP_DVMRP:
995 case IGMP_TRACE:
996 case IGMP_HOST_LEAVE_MESSAGE:
997 case IGMP_MTRACE:
998 case IGMP_MTRACE_RESP:
999 break;
1000 default:
1001 break;
1002 }
1003
1004 drop:
1005 if (dropped)
1006 kfree_skb(skb);
1007 else
1008 consume_skb(skb);
1009 return 0;
1010 }
1011
1012 #endif
1013
1014
1015 /*
1016 * Add a filter to a device
1017 */
1018
1019 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1020 {
1021 char buf[MAX_ADDR_LEN];
1022 struct net_device *dev = in_dev->dev;
1023
1024 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1025 We will get multicast token leakage, when IFF_MULTICAST
1026 is changed. This check should be done in ndo_set_rx_mode
1027 routine. Something sort of:
1028 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1029 --ANK
1030 */
1031 if (arp_mc_map(addr, buf, dev, 0) == 0)
1032 dev_mc_add(dev, buf);
1033 }
1034
1035 /*
1036 * Remove a filter from a device
1037 */
1038
1039 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1040 {
1041 char buf[MAX_ADDR_LEN];
1042 struct net_device *dev = in_dev->dev;
1043
1044 if (arp_mc_map(addr, buf, dev, 0) == 0)
1045 dev_mc_del(dev, buf);
1046 }
1047
1048 #ifdef CONFIG_IP_MULTICAST
1049 /*
1050 * deleted ip_mc_list manipulation
1051 */
1052 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1053 {
1054 struct ip_mc_list *pmc;
1055
1056 /* this is an "ip_mc_list" for convenience; only the fields below
1057 * are actually used. In particular, the refcnt and users are not
1058 * used for management of the delete list. Using the same structure
1059 * for deleted items allows change reports to use common code with
1060 * non-deleted or query-response MCA's.
1061 */
1062 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1063 if (!pmc)
1064 return;
1065 spin_lock_bh(&im->lock);
1066 pmc->interface = im->interface;
1067 in_dev_hold(in_dev);
1068 pmc->multiaddr = im->multiaddr;
1069 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1070 IGMP_Unsolicited_Report_Count;
1071 pmc->sfmode = im->sfmode;
1072 if (pmc->sfmode == MCAST_INCLUDE) {
1073 struct ip_sf_list *psf;
1074
1075 pmc->tomb = im->tomb;
1076 pmc->sources = im->sources;
1077 im->tomb = im->sources = NULL;
1078 for (psf=pmc->sources; psf; psf=psf->sf_next)
1079 psf->sf_crcount = pmc->crcount;
1080 }
1081 spin_unlock_bh(&im->lock);
1082
1083 spin_lock_bh(&in_dev->mc_tomb_lock);
1084 pmc->next = in_dev->mc_tomb;
1085 in_dev->mc_tomb = pmc;
1086 spin_unlock_bh(&in_dev->mc_tomb_lock);
1087 }
1088
1089 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1090 {
1091 struct ip_mc_list *pmc, *pmc_prev;
1092 struct ip_sf_list *psf, *psf_next;
1093
1094 spin_lock_bh(&in_dev->mc_tomb_lock);
1095 pmc_prev = NULL;
1096 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1097 if (pmc->multiaddr == multiaddr)
1098 break;
1099 pmc_prev = pmc;
1100 }
1101 if (pmc) {
1102 if (pmc_prev)
1103 pmc_prev->next = pmc->next;
1104 else
1105 in_dev->mc_tomb = pmc->next;
1106 }
1107 spin_unlock_bh(&in_dev->mc_tomb_lock);
1108 if (pmc) {
1109 for (psf=pmc->tomb; psf; psf=psf_next) {
1110 psf_next = psf->sf_next;
1111 kfree(psf);
1112 }
1113 in_dev_put(pmc->interface);
1114 kfree(pmc);
1115 }
1116 }
1117
1118 static void igmpv3_clear_delrec(struct in_device *in_dev)
1119 {
1120 struct ip_mc_list *pmc, *nextpmc;
1121
1122 spin_lock_bh(&in_dev->mc_tomb_lock);
1123 pmc = in_dev->mc_tomb;
1124 in_dev->mc_tomb = NULL;
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1126
1127 for (; pmc; pmc = nextpmc) {
1128 nextpmc = pmc->next;
1129 ip_mc_clear_src(pmc);
1130 in_dev_put(pmc->interface);
1131 kfree(pmc);
1132 }
1133 /* clear dead sources, too */
1134 rcu_read_lock();
1135 for_each_pmc_rcu(in_dev, pmc) {
1136 struct ip_sf_list *psf, *psf_next;
1137
1138 spin_lock_bh(&pmc->lock);
1139 psf = pmc->tomb;
1140 pmc->tomb = NULL;
1141 spin_unlock_bh(&pmc->lock);
1142 for (; psf; psf=psf_next) {
1143 psf_next = psf->sf_next;
1144 kfree(psf);
1145 }
1146 }
1147 rcu_read_unlock();
1148 }
1149 #endif
1150
1151 static void igmp_group_dropped(struct ip_mc_list *im)
1152 {
1153 struct in_device *in_dev = im->interface;
1154 #ifdef CONFIG_IP_MULTICAST
1155 int reporter;
1156 #endif
1157
1158 if (im->loaded) {
1159 im->loaded = 0;
1160 ip_mc_filter_del(in_dev, im->multiaddr);
1161 }
1162
1163 #ifdef CONFIG_IP_MULTICAST
1164 if (im->multiaddr == IGMP_ALL_HOSTS)
1165 return;
1166
1167 reporter = im->reporter;
1168 igmp_stop_timer(im);
1169
1170 if (!in_dev->dead) {
1171 if (IGMP_V1_SEEN(in_dev))
1172 return;
1173 if (IGMP_V2_SEEN(in_dev)) {
1174 if (reporter)
1175 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1176 return;
1177 }
1178 /* IGMPv3 */
1179 igmpv3_add_delrec(in_dev, im);
1180
1181 igmp_ifc_event(in_dev);
1182 }
1183 #endif
1184 }
1185
1186 static void igmp_group_added(struct ip_mc_list *im)
1187 {
1188 struct in_device *in_dev = im->interface;
1189
1190 if (im->loaded == 0) {
1191 im->loaded = 1;
1192 ip_mc_filter_add(in_dev, im->multiaddr);
1193 }
1194
1195 #ifdef CONFIG_IP_MULTICAST
1196 if (im->multiaddr == IGMP_ALL_HOSTS)
1197 return;
1198
1199 if (in_dev->dead)
1200 return;
1201 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1202 spin_lock_bh(&im->lock);
1203 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1204 spin_unlock_bh(&im->lock);
1205 return;
1206 }
1207 /* else, v3 */
1208
1209 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1210 IGMP_Unsolicited_Report_Count;
1211 igmp_ifc_event(in_dev);
1212 #endif
1213 }
1214
1215
1216 /*
1217 * Multicast list managers
1218 */
1219
1220
1221 /*
1222 * A socket has joined a multicast group on device dev.
1223 */
1224
1225 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1226 {
1227 struct ip_mc_list *im;
1228
1229 ASSERT_RTNL();
1230
1231 for_each_pmc_rtnl(in_dev, im) {
1232 if (im->multiaddr == addr) {
1233 im->users++;
1234 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1235 goto out;
1236 }
1237 }
1238
1239 im = kzalloc(sizeof(*im), GFP_KERNEL);
1240 if (!im)
1241 goto out;
1242
1243 im->users = 1;
1244 im->interface = in_dev;
1245 in_dev_hold(in_dev);
1246 im->multiaddr = addr;
1247 /* initial mode is (EX, empty) */
1248 im->sfmode = MCAST_EXCLUDE;
1249 im->sfcount[MCAST_EXCLUDE] = 1;
1250 atomic_set(&im->refcnt, 1);
1251 spin_lock_init(&im->lock);
1252 #ifdef CONFIG_IP_MULTICAST
1253 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1254 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1255 #endif
1256
1257 im->next_rcu = in_dev->mc_list;
1258 in_dev->mc_count++;
1259 rcu_assign_pointer(in_dev->mc_list, im);
1260
1261 #ifdef CONFIG_IP_MULTICAST
1262 igmpv3_del_delrec(in_dev, im->multiaddr);
1263 #endif
1264 igmp_group_added(im);
1265 if (!in_dev->dead)
1266 ip_rt_multicast_event(in_dev);
1267 out:
1268 return;
1269 }
1270 EXPORT_SYMBOL(ip_mc_inc_group);
1271
1272 /*
1273 * Resend IGMP JOIN report; used for bonding.
1274 * Called with rcu_read_lock()
1275 */
1276 void ip_mc_rejoin_groups(struct in_device *in_dev)
1277 {
1278 #ifdef CONFIG_IP_MULTICAST
1279 struct ip_mc_list *im;
1280 int type;
1281
1282 for_each_pmc_rcu(in_dev, im) {
1283 if (im->multiaddr == IGMP_ALL_HOSTS)
1284 continue;
1285
1286 /* a failover is happening and switches
1287 * must be notified immediately
1288 */
1289 if (IGMP_V1_SEEN(in_dev))
1290 type = IGMP_HOST_MEMBERSHIP_REPORT;
1291 else if (IGMP_V2_SEEN(in_dev))
1292 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1293 else
1294 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1295 igmp_send_report(in_dev, im, type);
1296 }
1297 #endif
1298 }
1299 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1300
1301 /*
1302 * A socket has left a multicast group on device dev
1303 */
1304
1305 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1306 {
1307 struct ip_mc_list *i;
1308 struct ip_mc_list __rcu **ip;
1309
1310 ASSERT_RTNL();
1311
1312 for (ip = &in_dev->mc_list;
1313 (i = rtnl_dereference(*ip)) != NULL;
1314 ip = &i->next_rcu) {
1315 if (i->multiaddr == addr) {
1316 if (--i->users == 0) {
1317 *ip = i->next_rcu;
1318 in_dev->mc_count--;
1319 igmp_group_dropped(i);
1320 ip_mc_clear_src(i);
1321
1322 if (!in_dev->dead)
1323 ip_rt_multicast_event(in_dev);
1324
1325 ip_ma_put(i);
1326 return;
1327 }
1328 break;
1329 }
1330 }
1331 }
1332 EXPORT_SYMBOL(ip_mc_dec_group);
1333
1334 /* Device changing type */
1335
1336 void ip_mc_unmap(struct in_device *in_dev)
1337 {
1338 struct ip_mc_list *pmc;
1339
1340 ASSERT_RTNL();
1341
1342 for_each_pmc_rtnl(in_dev, pmc)
1343 igmp_group_dropped(pmc);
1344 }
1345
1346 void ip_mc_remap(struct in_device *in_dev)
1347 {
1348 struct ip_mc_list *pmc;
1349
1350 ASSERT_RTNL();
1351
1352 for_each_pmc_rtnl(in_dev, pmc)
1353 igmp_group_added(pmc);
1354 }
1355
1356 /* Device going down */
1357
1358 void ip_mc_down(struct in_device *in_dev)
1359 {
1360 struct ip_mc_list *pmc;
1361
1362 ASSERT_RTNL();
1363
1364 for_each_pmc_rtnl(in_dev, pmc)
1365 igmp_group_dropped(pmc);
1366
1367 #ifdef CONFIG_IP_MULTICAST
1368 in_dev->mr_ifc_count = 0;
1369 if (del_timer(&in_dev->mr_ifc_timer))
1370 __in_dev_put(in_dev);
1371 in_dev->mr_gq_running = 0;
1372 if (del_timer(&in_dev->mr_gq_timer))
1373 __in_dev_put(in_dev);
1374 igmpv3_clear_delrec(in_dev);
1375 #endif
1376
1377 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1378 }
1379
1380 void ip_mc_init_dev(struct in_device *in_dev)
1381 {
1382 ASSERT_RTNL();
1383
1384 in_dev->mc_tomb = NULL;
1385 #ifdef CONFIG_IP_MULTICAST
1386 in_dev->mr_gq_running = 0;
1387 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1388 (unsigned long)in_dev);
1389 in_dev->mr_ifc_count = 0;
1390 in_dev->mc_count = 0;
1391 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1392 (unsigned long)in_dev);
1393 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1394 #endif
1395
1396 spin_lock_init(&in_dev->mc_tomb_lock);
1397 }
1398
1399 /* Device going up */
1400
1401 void ip_mc_up(struct in_device *in_dev)
1402 {
1403 struct ip_mc_list *pmc;
1404
1405 ASSERT_RTNL();
1406
1407 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1408
1409 for_each_pmc_rtnl(in_dev, pmc)
1410 igmp_group_added(pmc);
1411 }
1412
1413 /*
1414 * Device is about to be destroyed: clean up.
1415 */
1416
1417 void ip_mc_destroy_dev(struct in_device *in_dev)
1418 {
1419 struct ip_mc_list *i;
1420
1421 ASSERT_RTNL();
1422
1423 /* Deactivate timers */
1424 ip_mc_down(in_dev);
1425
1426 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1427 in_dev->mc_list = i->next_rcu;
1428 in_dev->mc_count--;
1429
1430 /* We've dropped the groups in ip_mc_down already */
1431 ip_mc_clear_src(i);
1432 ip_ma_put(i);
1433 }
1434 }
1435
1436 /* RTNL is locked */
1437 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1438 {
1439 struct net_device *dev = NULL;
1440 struct in_device *idev = NULL;
1441
1442 if (imr->imr_ifindex) {
1443 idev = inetdev_by_index(net, imr->imr_ifindex);
1444 return idev;
1445 }
1446 if (imr->imr_address.s_addr) {
1447 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1448 if (!dev)
1449 return NULL;
1450 }
1451
1452 if (!dev) {
1453 struct rtable *rt = ip_route_output(net,
1454 imr->imr_multiaddr.s_addr,
1455 0, 0, 0);
1456 if (!IS_ERR(rt)) {
1457 dev = rt->dst.dev;
1458 ip_rt_put(rt);
1459 }
1460 }
1461 if (dev) {
1462 imr->imr_ifindex = dev->ifindex;
1463 idev = __in_dev_get_rtnl(dev);
1464 }
1465 return idev;
1466 }
1467
1468 /*
1469 * Join a socket to a group
1470 */
1471 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1472 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1473
1474
1475 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1476 __be32 *psfsrc)
1477 {
1478 struct ip_sf_list *psf, *psf_prev;
1479 int rv = 0;
1480
1481 psf_prev = NULL;
1482 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1483 if (psf->sf_inaddr == *psfsrc)
1484 break;
1485 psf_prev = psf;
1486 }
1487 if (!psf || psf->sf_count[sfmode] == 0) {
1488 /* source filter not found, or count wrong => bug */
1489 return -ESRCH;
1490 }
1491 psf->sf_count[sfmode]--;
1492 if (psf->sf_count[sfmode] == 0) {
1493 ip_rt_multicast_event(pmc->interface);
1494 }
1495 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1496 #ifdef CONFIG_IP_MULTICAST
1497 struct in_device *in_dev = pmc->interface;
1498 #endif
1499
1500 /* no more filters for this source */
1501 if (psf_prev)
1502 psf_prev->sf_next = psf->sf_next;
1503 else
1504 pmc->sources = psf->sf_next;
1505 #ifdef CONFIG_IP_MULTICAST
1506 if (psf->sf_oldin &&
1507 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1508 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1509 IGMP_Unsolicited_Report_Count;
1510 psf->sf_next = pmc->tomb;
1511 pmc->tomb = psf;
1512 rv = 1;
1513 } else
1514 #endif
1515 kfree(psf);
1516 }
1517 return rv;
1518 }
1519
1520 #ifndef CONFIG_IP_MULTICAST
1521 #define igmp_ifc_event(x) do { } while (0)
1522 #endif
1523
1524 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1525 int sfcount, __be32 *psfsrc, int delta)
1526 {
1527 struct ip_mc_list *pmc;
1528 int changerec = 0;
1529 int i, err;
1530
1531 if (!in_dev)
1532 return -ENODEV;
1533 rcu_read_lock();
1534 for_each_pmc_rcu(in_dev, pmc) {
1535 if (*pmca == pmc->multiaddr)
1536 break;
1537 }
1538 if (!pmc) {
1539 /* MCA not found?? bug */
1540 rcu_read_unlock();
1541 return -ESRCH;
1542 }
1543 spin_lock_bh(&pmc->lock);
1544 rcu_read_unlock();
1545 #ifdef CONFIG_IP_MULTICAST
1546 sf_markstate(pmc);
1547 #endif
1548 if (!delta) {
1549 err = -EINVAL;
1550 if (!pmc->sfcount[sfmode])
1551 goto out_unlock;
1552 pmc->sfcount[sfmode]--;
1553 }
1554 err = 0;
1555 for (i=0; i<sfcount; i++) {
1556 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1557
1558 changerec |= rv > 0;
1559 if (!err && rv < 0)
1560 err = rv;
1561 }
1562 if (pmc->sfmode == MCAST_EXCLUDE &&
1563 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1564 pmc->sfcount[MCAST_INCLUDE]) {
1565 #ifdef CONFIG_IP_MULTICAST
1566 struct ip_sf_list *psf;
1567 #endif
1568
1569 /* filter mode change */
1570 pmc->sfmode = MCAST_INCLUDE;
1571 #ifdef CONFIG_IP_MULTICAST
1572 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1573 IGMP_Unsolicited_Report_Count;
1574 in_dev->mr_ifc_count = pmc->crcount;
1575 for (psf=pmc->sources; psf; psf = psf->sf_next)
1576 psf->sf_crcount = 0;
1577 igmp_ifc_event(pmc->interface);
1578 } else if (sf_setstate(pmc) || changerec) {
1579 igmp_ifc_event(pmc->interface);
1580 #endif
1581 }
1582 out_unlock:
1583 spin_unlock_bh(&pmc->lock);
1584 return err;
1585 }
1586
1587 /*
1588 * Add multicast single-source filter to the interface list
1589 */
1590 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1591 __be32 *psfsrc)
1592 {
1593 struct ip_sf_list *psf, *psf_prev;
1594
1595 psf_prev = NULL;
1596 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1597 if (psf->sf_inaddr == *psfsrc)
1598 break;
1599 psf_prev = psf;
1600 }
1601 if (!psf) {
1602 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1603 if (!psf)
1604 return -ENOBUFS;
1605 psf->sf_inaddr = *psfsrc;
1606 if (psf_prev) {
1607 psf_prev->sf_next = psf;
1608 } else
1609 pmc->sources = psf;
1610 }
1611 psf->sf_count[sfmode]++;
1612 if (psf->sf_count[sfmode] == 1) {
1613 ip_rt_multicast_event(pmc->interface);
1614 }
1615 return 0;
1616 }
1617
1618 #ifdef CONFIG_IP_MULTICAST
1619 static void sf_markstate(struct ip_mc_list *pmc)
1620 {
1621 struct ip_sf_list *psf;
1622 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1623
1624 for (psf=pmc->sources; psf; psf=psf->sf_next)
1625 if (pmc->sfcount[MCAST_EXCLUDE]) {
1626 psf->sf_oldin = mca_xcount ==
1627 psf->sf_count[MCAST_EXCLUDE] &&
1628 !psf->sf_count[MCAST_INCLUDE];
1629 } else
1630 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1631 }
1632
1633 static int sf_setstate(struct ip_mc_list *pmc)
1634 {
1635 struct ip_sf_list *psf, *dpsf;
1636 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1637 int qrv = pmc->interface->mr_qrv;
1638 int new_in, rv;
1639
1640 rv = 0;
1641 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1642 if (pmc->sfcount[MCAST_EXCLUDE]) {
1643 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1644 !psf->sf_count[MCAST_INCLUDE];
1645 } else
1646 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1647 if (new_in) {
1648 if (!psf->sf_oldin) {
1649 struct ip_sf_list *prev = NULL;
1650
1651 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1652 if (dpsf->sf_inaddr == psf->sf_inaddr)
1653 break;
1654 prev = dpsf;
1655 }
1656 if (dpsf) {
1657 if (prev)
1658 prev->sf_next = dpsf->sf_next;
1659 else
1660 pmc->tomb = dpsf->sf_next;
1661 kfree(dpsf);
1662 }
1663 psf->sf_crcount = qrv;
1664 rv++;
1665 }
1666 } else if (psf->sf_oldin) {
1667
1668 psf->sf_crcount = 0;
1669 /*
1670 * add or update "delete" records if an active filter
1671 * is now inactive
1672 */
1673 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1674 if (dpsf->sf_inaddr == psf->sf_inaddr)
1675 break;
1676 if (!dpsf) {
1677 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1678 if (!dpsf)
1679 continue;
1680 *dpsf = *psf;
1681 /* pmc->lock held by callers */
1682 dpsf->sf_next = pmc->tomb;
1683 pmc->tomb = dpsf;
1684 }
1685 dpsf->sf_crcount = qrv;
1686 rv++;
1687 }
1688 }
1689 return rv;
1690 }
1691 #endif
1692
1693 /*
1694 * Add multicast source filter list to the interface list
1695 */
1696 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1697 int sfcount, __be32 *psfsrc, int delta)
1698 {
1699 struct ip_mc_list *pmc;
1700 int isexclude;
1701 int i, err;
1702
1703 if (!in_dev)
1704 return -ENODEV;
1705 rcu_read_lock();
1706 for_each_pmc_rcu(in_dev, pmc) {
1707 if (*pmca == pmc->multiaddr)
1708 break;
1709 }
1710 if (!pmc) {
1711 /* MCA not found?? bug */
1712 rcu_read_unlock();
1713 return -ESRCH;
1714 }
1715 spin_lock_bh(&pmc->lock);
1716 rcu_read_unlock();
1717
1718 #ifdef CONFIG_IP_MULTICAST
1719 sf_markstate(pmc);
1720 #endif
1721 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1722 if (!delta)
1723 pmc->sfcount[sfmode]++;
1724 err = 0;
1725 for (i=0; i<sfcount; i++) {
1726 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1727 if (err)
1728 break;
1729 }
1730 if (err) {
1731 int j;
1732
1733 if (!delta)
1734 pmc->sfcount[sfmode]--;
1735 for (j=0; j<i; j++)
1736 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1737 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1738 #ifdef CONFIG_IP_MULTICAST
1739 struct ip_sf_list *psf;
1740 in_dev = pmc->interface;
1741 #endif
1742
1743 /* filter mode change */
1744 if (pmc->sfcount[MCAST_EXCLUDE])
1745 pmc->sfmode = MCAST_EXCLUDE;
1746 else if (pmc->sfcount[MCAST_INCLUDE])
1747 pmc->sfmode = MCAST_INCLUDE;
1748 #ifdef CONFIG_IP_MULTICAST
1749 /* else no filters; keep old mode for reports */
1750
1751 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1752 IGMP_Unsolicited_Report_Count;
1753 in_dev->mr_ifc_count = pmc->crcount;
1754 for (psf=pmc->sources; psf; psf = psf->sf_next)
1755 psf->sf_crcount = 0;
1756 igmp_ifc_event(in_dev);
1757 } else if (sf_setstate(pmc)) {
1758 igmp_ifc_event(in_dev);
1759 #endif
1760 }
1761 spin_unlock_bh(&pmc->lock);
1762 return err;
1763 }
1764
1765 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1766 {
1767 struct ip_sf_list *psf, *nextpsf;
1768
1769 for (psf=pmc->tomb; psf; psf=nextpsf) {
1770 nextpsf = psf->sf_next;
1771 kfree(psf);
1772 }
1773 pmc->tomb = NULL;
1774 for (psf=pmc->sources; psf; psf=nextpsf) {
1775 nextpsf = psf->sf_next;
1776 kfree(psf);
1777 }
1778 pmc->sources = NULL;
1779 pmc->sfmode = MCAST_EXCLUDE;
1780 pmc->sfcount[MCAST_INCLUDE] = 0;
1781 pmc->sfcount[MCAST_EXCLUDE] = 1;
1782 }
1783
1784
1785 /*
1786 * Join a multicast group
1787 */
1788 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1789 {
1790 int err;
1791 __be32 addr = imr->imr_multiaddr.s_addr;
1792 struct ip_mc_socklist *iml = NULL, *i;
1793 struct in_device *in_dev;
1794 struct inet_sock *inet = inet_sk(sk);
1795 struct net *net = sock_net(sk);
1796 int ifindex;
1797 int count = 0;
1798
1799 if (!ipv4_is_multicast(addr))
1800 return -EINVAL;
1801
1802 rtnl_lock();
1803
1804 in_dev = ip_mc_find_dev(net, imr);
1805
1806 if (!in_dev) {
1807 iml = NULL;
1808 err = -ENODEV;
1809 goto done;
1810 }
1811
1812 err = -EADDRINUSE;
1813 ifindex = imr->imr_ifindex;
1814 for_each_pmc_rtnl(inet, i) {
1815 if (i->multi.imr_multiaddr.s_addr == addr &&
1816 i->multi.imr_ifindex == ifindex)
1817 goto done;
1818 count++;
1819 }
1820 err = -ENOBUFS;
1821 if (count >= sysctl_igmp_max_memberships)
1822 goto done;
1823 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1824 if (iml == NULL)
1825 goto done;
1826
1827 memcpy(&iml->multi, imr, sizeof(*imr));
1828 iml->next_rcu = inet->mc_list;
1829 iml->sflist = NULL;
1830 iml->sfmode = MCAST_EXCLUDE;
1831 rcu_assign_pointer(inet->mc_list, iml);
1832 ip_mc_inc_group(in_dev, addr);
1833 err = 0;
1834 done:
1835 rtnl_unlock();
1836 return err;
1837 }
1838 EXPORT_SYMBOL(ip_mc_join_group);
1839
1840 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1841 struct in_device *in_dev)
1842 {
1843 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1844 int err;
1845
1846 if (psf == NULL) {
1847 /* any-source empty exclude case */
1848 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1849 iml->sfmode, 0, NULL, 0);
1850 }
1851 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1852 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1853 RCU_INIT_POINTER(iml->sflist, NULL);
1854 /* decrease mem now to avoid the memleak warning */
1855 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1856 kfree_rcu(psf, rcu);
1857 return err;
1858 }
1859
1860 /*
1861 * Ask a socket to leave a group.
1862 */
1863
1864 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1865 {
1866 struct inet_sock *inet = inet_sk(sk);
1867 struct ip_mc_socklist *iml;
1868 struct ip_mc_socklist __rcu **imlp;
1869 struct in_device *in_dev;
1870 struct net *net = sock_net(sk);
1871 __be32 group = imr->imr_multiaddr.s_addr;
1872 u32 ifindex;
1873 int ret = -EADDRNOTAVAIL;
1874
1875 rtnl_lock();
1876 in_dev = ip_mc_find_dev(net, imr);
1877 ifindex = imr->imr_ifindex;
1878 for (imlp = &inet->mc_list;
1879 (iml = rtnl_dereference(*imlp)) != NULL;
1880 imlp = &iml->next_rcu) {
1881 if (iml->multi.imr_multiaddr.s_addr != group)
1882 continue;
1883 if (ifindex) {
1884 if (iml->multi.imr_ifindex != ifindex)
1885 continue;
1886 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1887 iml->multi.imr_address.s_addr)
1888 continue;
1889
1890 (void) ip_mc_leave_src(sk, iml, in_dev);
1891
1892 *imlp = iml->next_rcu;
1893
1894 if (in_dev)
1895 ip_mc_dec_group(in_dev, group);
1896 rtnl_unlock();
1897 /* decrease mem now to avoid the memleak warning */
1898 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1899 kfree_rcu(iml, rcu);
1900 return 0;
1901 }
1902 if (!in_dev)
1903 ret = -ENODEV;
1904 rtnl_unlock();
1905 return ret;
1906 }
1907 EXPORT_SYMBOL(ip_mc_leave_group);
1908
1909 int ip_mc_source(int add, int omode, struct sock *sk, struct
1910 ip_mreq_source *mreqs, int ifindex)
1911 {
1912 int err;
1913 struct ip_mreqn imr;
1914 __be32 addr = mreqs->imr_multiaddr;
1915 struct ip_mc_socklist *pmc;
1916 struct in_device *in_dev = NULL;
1917 struct inet_sock *inet = inet_sk(sk);
1918 struct ip_sf_socklist *psl;
1919 struct net *net = sock_net(sk);
1920 int leavegroup = 0;
1921 int i, j, rv;
1922
1923 if (!ipv4_is_multicast(addr))
1924 return -EINVAL;
1925
1926 rtnl_lock();
1927
1928 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1929 imr.imr_address.s_addr = mreqs->imr_interface;
1930 imr.imr_ifindex = ifindex;
1931 in_dev = ip_mc_find_dev(net, &imr);
1932
1933 if (!in_dev) {
1934 err = -ENODEV;
1935 goto done;
1936 }
1937 err = -EADDRNOTAVAIL;
1938
1939 for_each_pmc_rtnl(inet, pmc) {
1940 if ((pmc->multi.imr_multiaddr.s_addr ==
1941 imr.imr_multiaddr.s_addr) &&
1942 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1943 break;
1944 }
1945 if (!pmc) { /* must have a prior join */
1946 err = -EINVAL;
1947 goto done;
1948 }
1949 /* if a source filter was set, must be the same mode as before */
1950 if (pmc->sflist) {
1951 if (pmc->sfmode != omode) {
1952 err = -EINVAL;
1953 goto done;
1954 }
1955 } else if (pmc->sfmode != omode) {
1956 /* allow mode switches for empty-set filters */
1957 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1958 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1959 NULL, 0);
1960 pmc->sfmode = omode;
1961 }
1962
1963 psl = rtnl_dereference(pmc->sflist);
1964 if (!add) {
1965 if (!psl)
1966 goto done; /* err = -EADDRNOTAVAIL */
1967 rv = !0;
1968 for (i=0; i<psl->sl_count; i++) {
1969 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1970 sizeof(__be32));
1971 if (rv == 0)
1972 break;
1973 }
1974 if (rv) /* source not found */
1975 goto done; /* err = -EADDRNOTAVAIL */
1976
1977 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1978 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1979 leavegroup = 1;
1980 goto done;
1981 }
1982
1983 /* update the interface filter */
1984 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1985 &mreqs->imr_sourceaddr, 1);
1986
1987 for (j=i+1; j<psl->sl_count; j++)
1988 psl->sl_addr[j-1] = psl->sl_addr[j];
1989 psl->sl_count--;
1990 err = 0;
1991 goto done;
1992 }
1993 /* else, add a new source to the filter */
1994
1995 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1996 err = -ENOBUFS;
1997 goto done;
1998 }
1999 if (!psl || psl->sl_count == psl->sl_max) {
2000 struct ip_sf_socklist *newpsl;
2001 int count = IP_SFBLOCK;
2002
2003 if (psl)
2004 count += psl->sl_max;
2005 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2006 if (!newpsl) {
2007 err = -ENOBUFS;
2008 goto done;
2009 }
2010 newpsl->sl_max = count;
2011 newpsl->sl_count = count - IP_SFBLOCK;
2012 if (psl) {
2013 for (i=0; i<psl->sl_count; i++)
2014 newpsl->sl_addr[i] = psl->sl_addr[i];
2015 /* decrease mem now to avoid the memleak warning */
2016 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2017 kfree_rcu(psl, rcu);
2018 }
2019 rcu_assign_pointer(pmc->sflist, newpsl);
2020 psl = newpsl;
2021 }
2022 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2023 for (i=0; i<psl->sl_count; i++) {
2024 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2025 sizeof(__be32));
2026 if (rv == 0)
2027 break;
2028 }
2029 if (rv == 0) /* address already there is an error */
2030 goto done;
2031 for (j=psl->sl_count-1; j>=i; j--)
2032 psl->sl_addr[j+1] = psl->sl_addr[j];
2033 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2034 psl->sl_count++;
2035 err = 0;
2036 /* update the interface list */
2037 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2038 &mreqs->imr_sourceaddr, 1);
2039 done:
2040 rtnl_unlock();
2041 if (leavegroup)
2042 return ip_mc_leave_group(sk, &imr);
2043 return err;
2044 }
2045
2046 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2047 {
2048 int err = 0;
2049 struct ip_mreqn imr;
2050 __be32 addr = msf->imsf_multiaddr;
2051 struct ip_mc_socklist *pmc;
2052 struct in_device *in_dev;
2053 struct inet_sock *inet = inet_sk(sk);
2054 struct ip_sf_socklist *newpsl, *psl;
2055 struct net *net = sock_net(sk);
2056 int leavegroup = 0;
2057
2058 if (!ipv4_is_multicast(addr))
2059 return -EINVAL;
2060 if (msf->imsf_fmode != MCAST_INCLUDE &&
2061 msf->imsf_fmode != MCAST_EXCLUDE)
2062 return -EINVAL;
2063
2064 rtnl_lock();
2065
2066 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2067 imr.imr_address.s_addr = msf->imsf_interface;
2068 imr.imr_ifindex = ifindex;
2069 in_dev = ip_mc_find_dev(net, &imr);
2070
2071 if (!in_dev) {
2072 err = -ENODEV;
2073 goto done;
2074 }
2075
2076 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2077 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2078 leavegroup = 1;
2079 goto done;
2080 }
2081
2082 for_each_pmc_rtnl(inet, pmc) {
2083 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2084 pmc->multi.imr_ifindex == imr.imr_ifindex)
2085 break;
2086 }
2087 if (!pmc) { /* must have a prior join */
2088 err = -EINVAL;
2089 goto done;
2090 }
2091 if (msf->imsf_numsrc) {
2092 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2093 GFP_KERNEL);
2094 if (!newpsl) {
2095 err = -ENOBUFS;
2096 goto done;
2097 }
2098 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2099 memcpy(newpsl->sl_addr, msf->imsf_slist,
2100 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2101 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2102 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2103 if (err) {
2104 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2105 goto done;
2106 }
2107 } else {
2108 newpsl = NULL;
2109 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2110 msf->imsf_fmode, 0, NULL, 0);
2111 }
2112 psl = rtnl_dereference(pmc->sflist);
2113 if (psl) {
2114 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2115 psl->sl_count, psl->sl_addr, 0);
2116 /* decrease mem now to avoid the memleak warning */
2117 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2118 kfree_rcu(psl, rcu);
2119 } else
2120 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2121 0, NULL, 0);
2122 rcu_assign_pointer(pmc->sflist, newpsl);
2123 pmc->sfmode = msf->imsf_fmode;
2124 err = 0;
2125 done:
2126 rtnl_unlock();
2127 if (leavegroup)
2128 err = ip_mc_leave_group(sk, &imr);
2129 return err;
2130 }
2131
2132 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2133 struct ip_msfilter __user *optval, int __user *optlen)
2134 {
2135 int err, len, count, copycount;
2136 struct ip_mreqn imr;
2137 __be32 addr = msf->imsf_multiaddr;
2138 struct ip_mc_socklist *pmc;
2139 struct in_device *in_dev;
2140 struct inet_sock *inet = inet_sk(sk);
2141 struct ip_sf_socklist *psl;
2142 struct net *net = sock_net(sk);
2143
2144 if (!ipv4_is_multicast(addr))
2145 return -EINVAL;
2146
2147 rtnl_lock();
2148
2149 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2150 imr.imr_address.s_addr = msf->imsf_interface;
2151 imr.imr_ifindex = 0;
2152 in_dev = ip_mc_find_dev(net, &imr);
2153
2154 if (!in_dev) {
2155 err = -ENODEV;
2156 goto done;
2157 }
2158 err = -EADDRNOTAVAIL;
2159
2160 for_each_pmc_rtnl(inet, pmc) {
2161 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2162 pmc->multi.imr_ifindex == imr.imr_ifindex)
2163 break;
2164 }
2165 if (!pmc) /* must have a prior join */
2166 goto done;
2167 msf->imsf_fmode = pmc->sfmode;
2168 psl = rtnl_dereference(pmc->sflist);
2169 rtnl_unlock();
2170 if (!psl) {
2171 len = 0;
2172 count = 0;
2173 } else {
2174 count = psl->sl_count;
2175 }
2176 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2177 len = copycount * sizeof(psl->sl_addr[0]);
2178 msf->imsf_numsrc = count;
2179 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2180 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2181 return -EFAULT;
2182 }
2183 if (len &&
2184 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2185 return -EFAULT;
2186 return 0;
2187 done:
2188 rtnl_unlock();
2189 return err;
2190 }
2191
2192 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2193 struct group_filter __user *optval, int __user *optlen)
2194 {
2195 int err, i, count, copycount;
2196 struct sockaddr_in *psin;
2197 __be32 addr;
2198 struct ip_mc_socklist *pmc;
2199 struct inet_sock *inet = inet_sk(sk);
2200 struct ip_sf_socklist *psl;
2201
2202 psin = (struct sockaddr_in *)&gsf->gf_group;
2203 if (psin->sin_family != AF_INET)
2204 return -EINVAL;
2205 addr = psin->sin_addr.s_addr;
2206 if (!ipv4_is_multicast(addr))
2207 return -EINVAL;
2208
2209 rtnl_lock();
2210
2211 err = -EADDRNOTAVAIL;
2212
2213 for_each_pmc_rtnl(inet, pmc) {
2214 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2215 pmc->multi.imr_ifindex == gsf->gf_interface)
2216 break;
2217 }
2218 if (!pmc) /* must have a prior join */
2219 goto done;
2220 gsf->gf_fmode = pmc->sfmode;
2221 psl = rtnl_dereference(pmc->sflist);
2222 rtnl_unlock();
2223 count = psl ? psl->sl_count : 0;
2224 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2225 gsf->gf_numsrc = count;
2226 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2227 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2228 return -EFAULT;
2229 }
2230 for (i=0; i<copycount; i++) {
2231 struct sockaddr_storage ss;
2232
2233 psin = (struct sockaddr_in *)&ss;
2234 memset(&ss, 0, sizeof(ss));
2235 psin->sin_family = AF_INET;
2236 psin->sin_addr.s_addr = psl->sl_addr[i];
2237 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2238 return -EFAULT;
2239 }
2240 return 0;
2241 done:
2242 rtnl_unlock();
2243 return err;
2244 }
2245
2246 /*
2247 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2248 */
2249 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2250 {
2251 struct inet_sock *inet = inet_sk(sk);
2252 struct ip_mc_socklist *pmc;
2253 struct ip_sf_socklist *psl;
2254 int i;
2255 int ret;
2256
2257 ret = 1;
2258 if (!ipv4_is_multicast(loc_addr))
2259 goto out;
2260
2261 rcu_read_lock();
2262 for_each_pmc_rcu(inet, pmc) {
2263 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2264 pmc->multi.imr_ifindex == dif)
2265 break;
2266 }
2267 ret = inet->mc_all;
2268 if (!pmc)
2269 goto unlock;
2270 psl = rcu_dereference(pmc->sflist);
2271 ret = (pmc->sfmode == MCAST_EXCLUDE);
2272 if (!psl)
2273 goto unlock;
2274
2275 for (i=0; i<psl->sl_count; i++) {
2276 if (psl->sl_addr[i] == rmt_addr)
2277 break;
2278 }
2279 ret = 0;
2280 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2281 goto unlock;
2282 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2283 goto unlock;
2284 ret = 1;
2285 unlock:
2286 rcu_read_unlock();
2287 out:
2288 return ret;
2289 }
2290
2291 /*
2292 * A socket is closing.
2293 */
2294
2295 void ip_mc_drop_socket(struct sock *sk)
2296 {
2297 struct inet_sock *inet = inet_sk(sk);
2298 struct ip_mc_socklist *iml;
2299 struct net *net = sock_net(sk);
2300
2301 if (inet->mc_list == NULL)
2302 return;
2303
2304 rtnl_lock();
2305 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2306 struct in_device *in_dev;
2307
2308 inet->mc_list = iml->next_rcu;
2309 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2310 (void) ip_mc_leave_src(sk, iml, in_dev);
2311 if (in_dev != NULL)
2312 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2313 /* decrease mem now to avoid the memleak warning */
2314 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2315 kfree_rcu(iml, rcu);
2316 }
2317 rtnl_unlock();
2318 }
2319
2320 /* called with rcu_read_lock() */
2321 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2322 {
2323 struct ip_mc_list *im;
2324 struct ip_sf_list *psf;
2325 int rv = 0;
2326
2327 for_each_pmc_rcu(in_dev, im) {
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 return rv;
2349 }
2350
2351 #if defined(CONFIG_PROC_FS)
2352 struct igmp_mc_iter_state {
2353 struct seq_net_private p;
2354 struct net_device *dev;
2355 struct in_device *in_dev;
2356 };
2357
2358 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2359
2360 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2361 {
2362 struct net *net = seq_file_net(seq);
2363 struct ip_mc_list *im = NULL;
2364 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2365
2366 state->in_dev = NULL;
2367 for_each_netdev_rcu(net, state->dev) {
2368 struct in_device *in_dev;
2369
2370 in_dev = __in_dev_get_rcu(state->dev);
2371 if (!in_dev)
2372 continue;
2373 im = rcu_dereference(in_dev->mc_list);
2374 if (im) {
2375 state->in_dev = in_dev;
2376 break;
2377 }
2378 }
2379 return im;
2380 }
2381
2382 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2383 {
2384 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2385
2386 im = rcu_dereference(im->next_rcu);
2387 while (!im) {
2388 state->dev = next_net_device_rcu(state->dev);
2389 if (!state->dev) {
2390 state->in_dev = NULL;
2391 break;
2392 }
2393 state->in_dev = __in_dev_get_rcu(state->dev);
2394 if (!state->in_dev)
2395 continue;
2396 im = rcu_dereference(state->in_dev->mc_list);
2397 }
2398 return im;
2399 }
2400
2401 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2402 {
2403 struct ip_mc_list *im = igmp_mc_get_first(seq);
2404 if (im)
2405 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2406 --pos;
2407 return pos ? NULL : im;
2408 }
2409
2410 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2411 __acquires(rcu)
2412 {
2413 rcu_read_lock();
2414 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2415 }
2416
2417 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2418 {
2419 struct ip_mc_list *im;
2420 if (v == SEQ_START_TOKEN)
2421 im = igmp_mc_get_first(seq);
2422 else
2423 im = igmp_mc_get_next(seq, v);
2424 ++*pos;
2425 return im;
2426 }
2427
2428 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2429 __releases(rcu)
2430 {
2431 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2432
2433 state->in_dev = NULL;
2434 state->dev = NULL;
2435 rcu_read_unlock();
2436 }
2437
2438 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2439 {
2440 if (v == SEQ_START_TOKEN)
2441 seq_puts(seq,
2442 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2443 else {
2444 struct ip_mc_list *im = (struct ip_mc_list *)v;
2445 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2446 char *querier;
2447 long delta;
2448
2449 #ifdef CONFIG_IP_MULTICAST
2450 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2451 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2452 "V3";
2453 #else
2454 querier = "NONE";
2455 #endif
2456
2457 if (rcu_dereference(state->in_dev->mc_list) == im) {
2458 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2459 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2460 }
2461
2462 delta = im->timer.expires - jiffies;
2463 seq_printf(seq,
2464 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2465 im->multiaddr, im->users,
2466 im->tm_running,
2467 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2468 im->reporter);
2469 }
2470 return 0;
2471 }
2472
2473 static const struct seq_operations igmp_mc_seq_ops = {
2474 .start = igmp_mc_seq_start,
2475 .next = igmp_mc_seq_next,
2476 .stop = igmp_mc_seq_stop,
2477 .show = igmp_mc_seq_show,
2478 };
2479
2480 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2481 {
2482 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2483 sizeof(struct igmp_mc_iter_state));
2484 }
2485
2486 static const struct file_operations igmp_mc_seq_fops = {
2487 .owner = THIS_MODULE,
2488 .open = igmp_mc_seq_open,
2489 .read = seq_read,
2490 .llseek = seq_lseek,
2491 .release = seq_release_net,
2492 };
2493
2494 struct igmp_mcf_iter_state {
2495 struct seq_net_private p;
2496 struct net_device *dev;
2497 struct in_device *idev;
2498 struct ip_mc_list *im;
2499 };
2500
2501 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2502
2503 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2504 {
2505 struct net *net = seq_file_net(seq);
2506 struct ip_sf_list *psf = NULL;
2507 struct ip_mc_list *im = NULL;
2508 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2509
2510 state->idev = NULL;
2511 state->im = NULL;
2512 for_each_netdev_rcu(net, state->dev) {
2513 struct in_device *idev;
2514 idev = __in_dev_get_rcu(state->dev);
2515 if (unlikely(idev == NULL))
2516 continue;
2517 im = rcu_dereference(idev->mc_list);
2518 if (likely(im != NULL)) {
2519 spin_lock_bh(&im->lock);
2520 psf = im->sources;
2521 if (likely(psf != NULL)) {
2522 state->im = im;
2523 state->idev = idev;
2524 break;
2525 }
2526 spin_unlock_bh(&im->lock);
2527 }
2528 }
2529 return psf;
2530 }
2531
2532 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2533 {
2534 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2535
2536 psf = psf->sf_next;
2537 while (!psf) {
2538 spin_unlock_bh(&state->im->lock);
2539 state->im = state->im->next;
2540 while (!state->im) {
2541 state->dev = next_net_device_rcu(state->dev);
2542 if (!state->dev) {
2543 state->idev = NULL;
2544 goto out;
2545 }
2546 state->idev = __in_dev_get_rcu(state->dev);
2547 if (!state->idev)
2548 continue;
2549 state->im = rcu_dereference(state->idev->mc_list);
2550 }
2551 if (!state->im)
2552 break;
2553 spin_lock_bh(&state->im->lock);
2554 psf = state->im->sources;
2555 }
2556 out:
2557 return psf;
2558 }
2559
2560 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2561 {
2562 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2563 if (psf)
2564 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2565 --pos;
2566 return pos ? NULL : psf;
2567 }
2568
2569 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2570 __acquires(rcu)
2571 {
2572 rcu_read_lock();
2573 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2574 }
2575
2576 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2577 {
2578 struct ip_sf_list *psf;
2579 if (v == SEQ_START_TOKEN)
2580 psf = igmp_mcf_get_first(seq);
2581 else
2582 psf = igmp_mcf_get_next(seq, v);
2583 ++*pos;
2584 return psf;
2585 }
2586
2587 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2588 __releases(rcu)
2589 {
2590 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2591 if (likely(state->im != NULL)) {
2592 spin_unlock_bh(&state->im->lock);
2593 state->im = NULL;
2594 }
2595 state->idev = NULL;
2596 state->dev = NULL;
2597 rcu_read_unlock();
2598 }
2599
2600 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2601 {
2602 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2603 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2604
2605 if (v == SEQ_START_TOKEN) {
2606 seq_printf(seq,
2607 "%3s %6s "
2608 "%10s %10s %6s %6s\n", "Idx",
2609 "Device", "MCA",
2610 "SRC", "INC", "EXC");
2611 } else {
2612 seq_printf(seq,
2613 "%3d %6.6s 0x%08x "
2614 "0x%08x %6lu %6lu\n",
2615 state->dev->ifindex, state->dev->name,
2616 ntohl(state->im->multiaddr),
2617 ntohl(psf->sf_inaddr),
2618 psf->sf_count[MCAST_INCLUDE],
2619 psf->sf_count[MCAST_EXCLUDE]);
2620 }
2621 return 0;
2622 }
2623
2624 static const struct seq_operations igmp_mcf_seq_ops = {
2625 .start = igmp_mcf_seq_start,
2626 .next = igmp_mcf_seq_next,
2627 .stop = igmp_mcf_seq_stop,
2628 .show = igmp_mcf_seq_show,
2629 };
2630
2631 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2632 {
2633 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2634 sizeof(struct igmp_mcf_iter_state));
2635 }
2636
2637 static const struct file_operations igmp_mcf_seq_fops = {
2638 .owner = THIS_MODULE,
2639 .open = igmp_mcf_seq_open,
2640 .read = seq_read,
2641 .llseek = seq_lseek,
2642 .release = seq_release_net,
2643 };
2644
2645 static int __net_init igmp_net_init(struct net *net)
2646 {
2647 struct proc_dir_entry *pde;
2648
2649 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2650 if (!pde)
2651 goto out_igmp;
2652 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2653 if (!pde)
2654 goto out_mcfilter;
2655 return 0;
2656
2657 out_mcfilter:
2658 proc_net_remove(net, "igmp");
2659 out_igmp:
2660 return -ENOMEM;
2661 }
2662
2663 static void __net_exit igmp_net_exit(struct net *net)
2664 {
2665 proc_net_remove(net, "mcfilter");
2666 proc_net_remove(net, "igmp");
2667 }
2668
2669 static struct pernet_operations igmp_net_ops = {
2670 .init = igmp_net_init,
2671 .exit = igmp_net_exit,
2672 };
2673
2674 int __init igmp_mc_proc_init(void)
2675 {
2676 return register_pernet_subsys(&igmp_net_ops);
2677 }
2678 #endif
CRIS linux kernel tree