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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6
[linux-2.6/next.git] / net / ipv4 / igmp.c
blob672e476c8c8a824a98c99fee9c3cabe765411c72
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 <asm/system.h>
77 #include <linux/types.h>
78 #include <linux/kernel.h>
79 #include <linux/jiffies.h>
80 #include <linux/string.h>
81 #include <linux/socket.h>
82 #include <linux/sockios.h>
83 #include <linux/in.h>
84 #include <linux/inet.h>
85 #include <linux/netdevice.h>
86 #include <linux/skbuff.h>
87 #include <linux/inetdevice.h>
88 #include <linux/igmp.h>
89 #include <linux/if_arp.h>
90 #include <linux/rtnetlink.h>
91 #include <linux/times.h>
92
93 #include <net/net_namespace.h>
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(dev_net(in_dev->dev), 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(dev_net(in_dev->dev), 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_rcu(im, rcu);
157 }
158 }
159
160 #define for_each_pmc_rcu(in_dev, pmc) \
161 for (pmc = rcu_dereference(in_dev->mc_list); \
162 pmc != NULL; \
163 pmc = rcu_dereference(pmc->next_rcu))
164
165 #define for_each_pmc_rtnl(in_dev, pmc) \
166 for (pmc = rtnl_dereference(in_dev->mc_list); \
167 pmc != NULL; \
168 pmc = rtnl_dereference(pmc->next_rcu))
169
170 #ifdef CONFIG_IP_MULTICAST
171
172 /*
173 * Timer management
174 */
175
176 static void igmp_stop_timer(struct ip_mc_list *im)
177 {
178 spin_lock_bh(&im->lock);
179 if (del_timer(&im->timer))
180 atomic_dec(&im->refcnt);
181 im->tm_running = 0;
182 im->reporter = 0;
183 im->unsolicit_count = 0;
184 spin_unlock_bh(&im->lock);
185 }
186
187 /* It must be called with locked im->lock */
188 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
189 {
190 int tv = net_random() % max_delay;
191
192 im->tm_running = 1;
193 if (!mod_timer(&im->timer, jiffies+tv+2))
194 atomic_inc(&im->refcnt);
195 }
196
197 static void igmp_gq_start_timer(struct in_device *in_dev)
198 {
199 int tv = net_random() % in_dev->mr_maxdelay;
200
201 in_dev->mr_gq_running = 1;
202 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
203 in_dev_hold(in_dev);
204 }
205
206 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
207 {
208 int tv = net_random() % delay;
209
210 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
211 in_dev_hold(in_dev);
212 }
213
214 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
215 {
216 spin_lock_bh(&im->lock);
217 im->unsolicit_count = 0;
218 if (del_timer(&im->timer)) {
219 if ((long)(im->timer.expires-jiffies) < max_delay) {
220 add_timer(&im->timer);
221 im->tm_running = 1;
222 spin_unlock_bh(&im->lock);
223 return;
224 }
225 atomic_dec(&im->refcnt);
226 }
227 igmp_start_timer(im, max_delay);
228 spin_unlock_bh(&im->lock);
229 }
230
231
232 /*
233 * Send an IGMP report.
234 */
235
236 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
237
238
239 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
240 int gdeleted, int sdeleted)
241 {
242 switch (type) {
243 case IGMPV3_MODE_IS_INCLUDE:
244 case IGMPV3_MODE_IS_EXCLUDE:
245 if (gdeleted || sdeleted)
246 return 0;
247 if (!(pmc->gsquery && !psf->sf_gsresp)) {
248 if (pmc->sfmode == MCAST_INCLUDE)
249 return 1;
250 /* don't include if this source is excluded
251 * in all filters
252 */
253 if (psf->sf_count[MCAST_INCLUDE])
254 return type == IGMPV3_MODE_IS_INCLUDE;
255 return pmc->sfcount[MCAST_EXCLUDE] ==
256 psf->sf_count[MCAST_EXCLUDE];
257 }
258 return 0;
259 case IGMPV3_CHANGE_TO_INCLUDE:
260 if (gdeleted || sdeleted)
261 return 0;
262 return psf->sf_count[MCAST_INCLUDE] != 0;
263 case IGMPV3_CHANGE_TO_EXCLUDE:
264 if (gdeleted || sdeleted)
265 return 0;
266 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
267 psf->sf_count[MCAST_INCLUDE])
268 return 0;
269 return pmc->sfcount[MCAST_EXCLUDE] ==
270 psf->sf_count[MCAST_EXCLUDE];
271 case IGMPV3_ALLOW_NEW_SOURCES:
272 if (gdeleted || !psf->sf_crcount)
273 return 0;
274 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
275 case IGMPV3_BLOCK_OLD_SOURCES:
276 if (pmc->sfmode == MCAST_INCLUDE)
277 return gdeleted || (psf->sf_crcount && sdeleted);
278 return psf->sf_crcount && !gdeleted && !sdeleted;
279 }
280 return 0;
281 }
282
283 static int
284 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
285 {
286 struct ip_sf_list *psf;
287 int scount = 0;
288
289 for (psf=pmc->sources; psf; psf=psf->sf_next) {
290 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
291 continue;
292 scount++;
293 }
294 return scount;
295 }
296
297 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
298
299 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
300 {
301 struct sk_buff *skb;
302 struct rtable *rt;
303 struct iphdr *pip;
304 struct igmpv3_report *pig;
305 struct net *net = dev_net(dev);
306 struct flowi4 fl4;
307
308 while (1) {
309 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev),
310 GFP_ATOMIC | __GFP_NOWARN);
311 if (skb)
312 break;
313 size >>= 1;
314 if (size < 256)
315 return NULL;
316 }
317 igmp_skb_size(skb) = size;
318
319 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
320 0, 0,
321 IPPROTO_IGMP, 0, dev->ifindex);
322 if (IS_ERR(rt)) {
323 kfree_skb(skb);
324 return NULL;
325 }
326
327 skb_dst_set(skb, &rt->dst);
328 skb->dev = dev;
329
330 skb_reserve(skb, LL_RESERVED_SPACE(dev));
331
332 skb_reset_network_header(skb);
333 pip = ip_hdr(skb);
334 skb_put(skb, sizeof(struct iphdr) + 4);
335
336 pip->version = 4;
337 pip->ihl = (sizeof(struct iphdr)+4)>>2;
338 pip->tos = 0xc0;
339 pip->frag_off = htons(IP_DF);
340 pip->ttl = 1;
341 pip->daddr = fl4.daddr;
342 pip->saddr = fl4.saddr;
343 pip->protocol = IPPROTO_IGMP;
344 pip->tot_len = 0; /* filled in later */
345 ip_select_ident(pip, &rt->dst, NULL);
346 ((u8*)&pip[1])[0] = IPOPT_RA;
347 ((u8*)&pip[1])[1] = 4;
348 ((u8*)&pip[1])[2] = 0;
349 ((u8*)&pip[1])[3] = 0;
350
351 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
352 skb_put(skb, sizeof(*pig));
353 pig = igmpv3_report_hdr(skb);
354 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
355 pig->resv1 = 0;
356 pig->csum = 0;
357 pig->resv2 = 0;
358 pig->ngrec = 0;
359 return skb;
360 }
361
362 static int igmpv3_sendpack(struct sk_buff *skb)
363 {
364 struct igmphdr *pig = igmp_hdr(skb);
365 const int igmplen = skb->tail - skb->transport_header;
366
367 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
368
369 return ip_local_out(skb);
370 }
371
372 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
373 {
374 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
375 }
376
377 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
378 int type, struct igmpv3_grec **ppgr)
379 {
380 struct net_device *dev = pmc->interface->dev;
381 struct igmpv3_report *pih;
382 struct igmpv3_grec *pgr;
383
384 if (!skb)
385 skb = igmpv3_newpack(dev, dev->mtu);
386 if (!skb)
387 return NULL;
388 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
389 pgr->grec_type = type;
390 pgr->grec_auxwords = 0;
391 pgr->grec_nsrcs = 0;
392 pgr->grec_mca = pmc->multiaddr;
393 pih = igmpv3_report_hdr(skb);
394 pih->ngrec = htons(ntohs(pih->ngrec)+1);
395 *ppgr = pgr;
396 return skb;
397 }
398
399 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
400 skb_tailroom(skb)) : 0)
401
402 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
403 int type, int gdeleted, int sdeleted)
404 {
405 struct net_device *dev = pmc->interface->dev;
406 struct igmpv3_report *pih;
407 struct igmpv3_grec *pgr = NULL;
408 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
409 int scount, stotal, first, isquery, truncate;
410
411 if (pmc->multiaddr == IGMP_ALL_HOSTS)
412 return skb;
413
414 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
415 type == IGMPV3_MODE_IS_EXCLUDE;
416 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
417 type == IGMPV3_CHANGE_TO_EXCLUDE;
418
419 stotal = scount = 0;
420
421 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
422
423 if (!*psf_list)
424 goto empty_source;
425
426 pih = skb ? igmpv3_report_hdr(skb) : NULL;
427
428 /* EX and TO_EX get a fresh packet, if needed */
429 if (truncate) {
430 if (pih && pih->ngrec &&
431 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
432 if (skb)
433 igmpv3_sendpack(skb);
434 skb = igmpv3_newpack(dev, dev->mtu);
435 }
436 }
437 first = 1;
438 psf_prev = NULL;
439 for (psf=*psf_list; psf; psf=psf_next) {
440 __be32 *psrc;
441
442 psf_next = psf->sf_next;
443
444 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
445 psf_prev = psf;
446 continue;
447 }
448
449 /* clear marks on query responses */
450 if (isquery)
451 psf->sf_gsresp = 0;
452
453 if (AVAILABLE(skb) < sizeof(__be32) +
454 first*sizeof(struct igmpv3_grec)) {
455 if (truncate && !first)
456 break; /* truncate these */
457 if (pgr)
458 pgr->grec_nsrcs = htons(scount);
459 if (skb)
460 igmpv3_sendpack(skb);
461 skb = igmpv3_newpack(dev, dev->mtu);
462 first = 1;
463 scount = 0;
464 }
465 if (first) {
466 skb = add_grhead(skb, pmc, type, &pgr);
467 first = 0;
468 }
469 if (!skb)
470 return NULL;
471 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
472 *psrc = psf->sf_inaddr;
473 scount++; stotal++;
474 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
475 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
476 psf->sf_crcount--;
477 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
478 if (psf_prev)
479 psf_prev->sf_next = psf->sf_next;
480 else
481 *psf_list = psf->sf_next;
482 kfree(psf);
483 continue;
484 }
485 }
486 psf_prev = psf;
487 }
488
489 empty_source:
490 if (!stotal) {
491 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
492 type == IGMPV3_BLOCK_OLD_SOURCES)
493 return skb;
494 if (pmc->crcount || isquery) {
495 /* make sure we have room for group header */
496 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
497 igmpv3_sendpack(skb);
498 skb = NULL; /* add_grhead will get a new one */
499 }
500 skb = add_grhead(skb, pmc, type, &pgr);
501 }
502 }
503 if (pgr)
504 pgr->grec_nsrcs = htons(scount);
505
506 if (isquery)
507 pmc->gsquery = 0; /* clear query state on report */
508 return skb;
509 }
510
511 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
512 {
513 struct sk_buff *skb = NULL;
514 int type;
515
516 if (!pmc) {
517 rcu_read_lock();
518 for_each_pmc_rcu(in_dev, pmc) {
519 if (pmc->multiaddr == IGMP_ALL_HOSTS)
520 continue;
521 spin_lock_bh(&pmc->lock);
522 if (pmc->sfcount[MCAST_EXCLUDE])
523 type = IGMPV3_MODE_IS_EXCLUDE;
524 else
525 type = IGMPV3_MODE_IS_INCLUDE;
526 skb = add_grec(skb, pmc, type, 0, 0);
527 spin_unlock_bh(&pmc->lock);
528 }
529 rcu_read_unlock();
530 } else {
531 spin_lock_bh(&pmc->lock);
532 if (pmc->sfcount[MCAST_EXCLUDE])
533 type = IGMPV3_MODE_IS_EXCLUDE;
534 else
535 type = IGMPV3_MODE_IS_INCLUDE;
536 skb = add_grec(skb, pmc, type, 0, 0);
537 spin_unlock_bh(&pmc->lock);
538 }
539 if (!skb)
540 return 0;
541 return igmpv3_sendpack(skb);
542 }
543
544 /*
545 * remove zero-count source records from a source filter list
546 */
547 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
548 {
549 struct ip_sf_list *psf_prev, *psf_next, *psf;
550
551 psf_prev = NULL;
552 for (psf=*ppsf; psf; psf = psf_next) {
553 psf_next = psf->sf_next;
554 if (psf->sf_crcount == 0) {
555 if (psf_prev)
556 psf_prev->sf_next = psf->sf_next;
557 else
558 *ppsf = psf->sf_next;
559 kfree(psf);
560 } else
561 psf_prev = psf;
562 }
563 }
564
565 static void igmpv3_send_cr(struct in_device *in_dev)
566 {
567 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
568 struct sk_buff *skb = NULL;
569 int type, dtype;
570
571 rcu_read_lock();
572 spin_lock_bh(&in_dev->mc_tomb_lock);
573
574 /* deleted MCA's */
575 pmc_prev = NULL;
576 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
577 pmc_next = pmc->next;
578 if (pmc->sfmode == MCAST_INCLUDE) {
579 type = IGMPV3_BLOCK_OLD_SOURCES;
580 dtype = IGMPV3_BLOCK_OLD_SOURCES;
581 skb = add_grec(skb, pmc, type, 1, 0);
582 skb = add_grec(skb, pmc, dtype, 1, 1);
583 }
584 if (pmc->crcount) {
585 if (pmc->sfmode == MCAST_EXCLUDE) {
586 type = IGMPV3_CHANGE_TO_INCLUDE;
587 skb = add_grec(skb, pmc, type, 1, 0);
588 }
589 pmc->crcount--;
590 if (pmc->crcount == 0) {
591 igmpv3_clear_zeros(&pmc->tomb);
592 igmpv3_clear_zeros(&pmc->sources);
593 }
594 }
595 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
596 if (pmc_prev)
597 pmc_prev->next = pmc_next;
598 else
599 in_dev->mc_tomb = pmc_next;
600 in_dev_put(pmc->interface);
601 kfree(pmc);
602 } else
603 pmc_prev = pmc;
604 }
605 spin_unlock_bh(&in_dev->mc_tomb_lock);
606
607 /* change recs */
608 for_each_pmc_rcu(in_dev, pmc) {
609 spin_lock_bh(&pmc->lock);
610 if (pmc->sfcount[MCAST_EXCLUDE]) {
611 type = IGMPV3_BLOCK_OLD_SOURCES;
612 dtype = IGMPV3_ALLOW_NEW_SOURCES;
613 } else {
614 type = IGMPV3_ALLOW_NEW_SOURCES;
615 dtype = IGMPV3_BLOCK_OLD_SOURCES;
616 }
617 skb = add_grec(skb, pmc, type, 0, 0);
618 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
619
620 /* filter mode changes */
621 if (pmc->crcount) {
622 if (pmc->sfmode == MCAST_EXCLUDE)
623 type = IGMPV3_CHANGE_TO_EXCLUDE;
624 else
625 type = IGMPV3_CHANGE_TO_INCLUDE;
626 skb = add_grec(skb, pmc, type, 0, 0);
627 pmc->crcount--;
628 }
629 spin_unlock_bh(&pmc->lock);
630 }
631 rcu_read_unlock();
632
633 if (!skb)
634 return;
635 (void) igmpv3_sendpack(skb);
636 }
637
638 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
639 int type)
640 {
641 struct sk_buff *skb;
642 struct iphdr *iph;
643 struct igmphdr *ih;
644 struct rtable *rt;
645 struct net_device *dev = in_dev->dev;
646 struct net *net = dev_net(dev);
647 __be32 group = pmc ? pmc->multiaddr : 0;
648 struct flowi4 fl4;
649 __be32 dst;
650
651 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
652 return igmpv3_send_report(in_dev, pmc);
653 else if (type == IGMP_HOST_LEAVE_MESSAGE)
654 dst = IGMP_ALL_ROUTER;
655 else
656 dst = group;
657
658 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
659 0, 0,
660 IPPROTO_IGMP, 0, dev->ifindex);
661 if (IS_ERR(rt))
662 return -1;
663
664 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
665 if (skb == NULL) {
666 ip_rt_put(rt);
667 return -1;
668 }
669
670 skb_dst_set(skb, &rt->dst);
671
672 skb_reserve(skb, LL_RESERVED_SPACE(dev));
673
674 skb_reset_network_header(skb);
675 iph = ip_hdr(skb);
676 skb_put(skb, sizeof(struct iphdr) + 4);
677
678 iph->version = 4;
679 iph->ihl = (sizeof(struct iphdr)+4)>>2;
680 iph->tos = 0xc0;
681 iph->frag_off = htons(IP_DF);
682 iph->ttl = 1;
683 iph->daddr = dst;
684 iph->saddr = fl4.saddr;
685 iph->protocol = IPPROTO_IGMP;
686 ip_select_ident(iph, &rt->dst, NULL);
687 ((u8*)&iph[1])[0] = IPOPT_RA;
688 ((u8*)&iph[1])[1] = 4;
689 ((u8*)&iph[1])[2] = 0;
690 ((u8*)&iph[1])[3] = 0;
691
692 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
693 ih->type = type;
694 ih->code = 0;
695 ih->csum = 0;
696 ih->group = group;
697 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
698
699 return ip_local_out(skb);
700 }
701
702 static void igmp_gq_timer_expire(unsigned long data)
703 {
704 struct in_device *in_dev = (struct in_device *)data;
705
706 in_dev->mr_gq_running = 0;
707 igmpv3_send_report(in_dev, NULL);
708 __in_dev_put(in_dev);
709 }
710
711 static void igmp_ifc_timer_expire(unsigned long data)
712 {
713 struct in_device *in_dev = (struct in_device *)data;
714
715 igmpv3_send_cr(in_dev);
716 if (in_dev->mr_ifc_count) {
717 in_dev->mr_ifc_count--;
718 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
719 }
720 __in_dev_put(in_dev);
721 }
722
723 static void igmp_ifc_event(struct in_device *in_dev)
724 {
725 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
726 return;
727 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
728 IGMP_Unsolicited_Report_Count;
729 igmp_ifc_start_timer(in_dev, 1);
730 }
731
732
733 static void igmp_timer_expire(unsigned long data)
734 {
735 struct ip_mc_list *im=(struct ip_mc_list *)data;
736 struct in_device *in_dev = im->interface;
737
738 spin_lock(&im->lock);
739 im->tm_running = 0;
740
741 if (im->unsolicit_count) {
742 im->unsolicit_count--;
743 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
744 }
745 im->reporter = 1;
746 spin_unlock(&im->lock);
747
748 if (IGMP_V1_SEEN(in_dev))
749 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
750 else if (IGMP_V2_SEEN(in_dev))
751 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
752 else
753 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
754
755 ip_ma_put(im);
756 }
757
758 /* mark EXCLUDE-mode sources */
759 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
760 {
761 struct ip_sf_list *psf;
762 int i, scount;
763
764 scount = 0;
765 for (psf=pmc->sources; psf; psf=psf->sf_next) {
766 if (scount == nsrcs)
767 break;
768 for (i=0; i<nsrcs; i++) {
769 /* skip inactive filters */
770 if (pmc->sfcount[MCAST_INCLUDE] ||
771 pmc->sfcount[MCAST_EXCLUDE] !=
772 psf->sf_count[MCAST_EXCLUDE])
773 continue;
774 if (srcs[i] == psf->sf_inaddr) {
775 scount++;
776 break;
777 }
778 }
779 }
780 pmc->gsquery = 0;
781 if (scount == nsrcs) /* all sources excluded */
782 return 0;
783 return 1;
784 }
785
786 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
787 {
788 struct ip_sf_list *psf;
789 int i, scount;
790
791 if (pmc->sfmode == MCAST_EXCLUDE)
792 return igmp_xmarksources(pmc, nsrcs, srcs);
793
794 /* mark INCLUDE-mode sources */
795 scount = 0;
796 for (psf=pmc->sources; psf; psf=psf->sf_next) {
797 if (scount == nsrcs)
798 break;
799 for (i=0; i<nsrcs; i++)
800 if (srcs[i] == psf->sf_inaddr) {
801 psf->sf_gsresp = 1;
802 scount++;
803 break;
804 }
805 }
806 if (!scount) {
807 pmc->gsquery = 0;
808 return 0;
809 }
810 pmc->gsquery = 1;
811 return 1;
812 }
813
814 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
815 {
816 struct ip_mc_list *im;
817
818 /* Timers are only set for non-local groups */
819
820 if (group == IGMP_ALL_HOSTS)
821 return;
822
823 rcu_read_lock();
824 for_each_pmc_rcu(in_dev, im) {
825 if (im->multiaddr == group) {
826 igmp_stop_timer(im);
827 break;
828 }
829 }
830 rcu_read_unlock();
831 }
832
833 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
834 int len)
835 {
836 struct igmphdr *ih = igmp_hdr(skb);
837 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
838 struct ip_mc_list *im;
839 __be32 group = ih->group;
840 int max_delay;
841 int mark = 0;
842
843
844 if (len == 8) {
845 if (ih->code == 0) {
846 /* Alas, old v1 router presents here. */
847
848 max_delay = IGMP_Query_Response_Interval;
849 in_dev->mr_v1_seen = jiffies +
850 IGMP_V1_Router_Present_Timeout;
851 group = 0;
852 } else {
853 /* v2 router present */
854 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
855 in_dev->mr_v2_seen = jiffies +
856 IGMP_V2_Router_Present_Timeout;
857 }
858 /* cancel the interface change timer */
859 in_dev->mr_ifc_count = 0;
860 if (del_timer(&in_dev->mr_ifc_timer))
861 __in_dev_put(in_dev);
862 /* clear deleted report items */
863 igmpv3_clear_delrec(in_dev);
864 } else if (len < 12) {
865 return; /* ignore bogus packet; freed by caller */
866 } else if (IGMP_V1_SEEN(in_dev)) {
867 /* This is a v3 query with v1 queriers present */
868 max_delay = IGMP_Query_Response_Interval;
869 group = 0;
870 } else if (IGMP_V2_SEEN(in_dev)) {
871 /* this is a v3 query with v2 queriers present;
872 * Interpretation of the max_delay code is problematic here.
873 * A real v2 host would use ih_code directly, while v3 has a
874 * different encoding. We use the v3 encoding as more likely
875 * to be intended in a v3 query.
876 */
877 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
878 } else { /* v3 */
879 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
880 return;
881
882 ih3 = igmpv3_query_hdr(skb);
883 if (ih3->nsrcs) {
884 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
885 + ntohs(ih3->nsrcs)*sizeof(__be32)))
886 return;
887 ih3 = igmpv3_query_hdr(skb);
888 }
889
890 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
891 if (!max_delay)
892 max_delay = 1; /* can't mod w/ 0 */
893 in_dev->mr_maxdelay = max_delay;
894 if (ih3->qrv)
895 in_dev->mr_qrv = ih3->qrv;
896 if (!group) { /* general query */
897 if (ih3->nsrcs)
898 return; /* no sources allowed */
899 igmp_gq_start_timer(in_dev);
900 return;
901 }
902 /* mark sources to include, if group & source-specific */
903 mark = ih3->nsrcs != 0;
904 }
905
906 /*
907 * - Start the timers in all of our membership records
908 * that the query applies to for the interface on
909 * which the query arrived excl. those that belong
910 * to a "local" group (224.0.0.X)
911 * - For timers already running check if they need to
912 * be reset.
913 * - Use the igmp->igmp_code field as the maximum
914 * delay possible
915 */
916 rcu_read_lock();
917 for_each_pmc_rcu(in_dev, im) {
918 int changed;
919
920 if (group && group != im->multiaddr)
921 continue;
922 if (im->multiaddr == IGMP_ALL_HOSTS)
923 continue;
924 spin_lock_bh(&im->lock);
925 if (im->tm_running)
926 im->gsquery = im->gsquery && mark;
927 else
928 im->gsquery = mark;
929 changed = !im->gsquery ||
930 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
931 spin_unlock_bh(&im->lock);
932 if (changed)
933 igmp_mod_timer(im, max_delay);
934 }
935 rcu_read_unlock();
936 }
937
938 /* called in rcu_read_lock() section */
939 int igmp_rcv(struct sk_buff *skb)
940 {
941 /* This basically follows the spec line by line -- see RFC1112 */
942 struct igmphdr *ih;
943 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
944 int len = skb->len;
945
946 if (in_dev == NULL)
947 goto drop;
948
949 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
950 goto drop;
951
952 switch (skb->ip_summed) {
953 case CHECKSUM_COMPLETE:
954 if (!csum_fold(skb->csum))
955 break;
956 /* fall through */
957 case CHECKSUM_NONE:
958 skb->csum = 0;
959 if (__skb_checksum_complete(skb))
960 goto drop;
961 }
962
963 ih = igmp_hdr(skb);
964 switch (ih->type) {
965 case IGMP_HOST_MEMBERSHIP_QUERY:
966 igmp_heard_query(in_dev, skb, len);
967 break;
968 case IGMP_HOST_MEMBERSHIP_REPORT:
969 case IGMPV2_HOST_MEMBERSHIP_REPORT:
970 /* Is it our report looped back? */
971 if (rt_is_output_route(skb_rtable(skb)))
972 break;
973 /* don't rely on MC router hearing unicast reports */
974 if (skb->pkt_type == PACKET_MULTICAST ||
975 skb->pkt_type == PACKET_BROADCAST)
976 igmp_heard_report(in_dev, ih->group);
977 break;
978 case IGMP_PIM:
979 #ifdef CONFIG_IP_PIMSM_V1
980 return pim_rcv_v1(skb);
981 #endif
982 case IGMPV3_HOST_MEMBERSHIP_REPORT:
983 case IGMP_DVMRP:
984 case IGMP_TRACE:
985 case IGMP_HOST_LEAVE_MESSAGE:
986 case IGMP_MTRACE:
987 case IGMP_MTRACE_RESP:
988 break;
989 default:
990 break;
991 }
992
993 drop:
994 kfree_skb(skb);
995 return 0;
996 }
997
998 #endif
999
1000
1001 /*
1002 * Add a filter to a device
1003 */
1004
1005 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1006 {
1007 char buf[MAX_ADDR_LEN];
1008 struct net_device *dev = in_dev->dev;
1009
1010 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1011 We will get multicast token leakage, when IFF_MULTICAST
1012 is changed. This check should be done in dev->set_multicast_list
1013 routine. Something sort of:
1014 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1015 --ANK
1016 */
1017 if (arp_mc_map(addr, buf, dev, 0) == 0)
1018 dev_mc_add(dev, buf);
1019 }
1020
1021 /*
1022 * Remove a filter from a device
1023 */
1024
1025 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1026 {
1027 char buf[MAX_ADDR_LEN];
1028 struct net_device *dev = in_dev->dev;
1029
1030 if (arp_mc_map(addr, buf, dev, 0) == 0)
1031 dev_mc_del(dev, buf);
1032 }
1033
1034 #ifdef CONFIG_IP_MULTICAST
1035 /*
1036 * deleted ip_mc_list manipulation
1037 */
1038 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1039 {
1040 struct ip_mc_list *pmc;
1041
1042 /* this is an "ip_mc_list" for convenience; only the fields below
1043 * are actually used. In particular, the refcnt and users are not
1044 * used for management of the delete list. Using the same structure
1045 * for deleted items allows change reports to use common code with
1046 * non-deleted or query-response MCA's.
1047 */
1048 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1049 if (!pmc)
1050 return;
1051 spin_lock_bh(&im->lock);
1052 pmc->interface = im->interface;
1053 in_dev_hold(in_dev);
1054 pmc->multiaddr = im->multiaddr;
1055 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1056 IGMP_Unsolicited_Report_Count;
1057 pmc->sfmode = im->sfmode;
1058 if (pmc->sfmode == MCAST_INCLUDE) {
1059 struct ip_sf_list *psf;
1060
1061 pmc->tomb = im->tomb;
1062 pmc->sources = im->sources;
1063 im->tomb = im->sources = NULL;
1064 for (psf=pmc->sources; psf; psf=psf->sf_next)
1065 psf->sf_crcount = pmc->crcount;
1066 }
1067 spin_unlock_bh(&im->lock);
1068
1069 spin_lock_bh(&in_dev->mc_tomb_lock);
1070 pmc->next = in_dev->mc_tomb;
1071 in_dev->mc_tomb = pmc;
1072 spin_unlock_bh(&in_dev->mc_tomb_lock);
1073 }
1074
1075 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1076 {
1077 struct ip_mc_list *pmc, *pmc_prev;
1078 struct ip_sf_list *psf, *psf_next;
1079
1080 spin_lock_bh(&in_dev->mc_tomb_lock);
1081 pmc_prev = NULL;
1082 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1083 if (pmc->multiaddr == multiaddr)
1084 break;
1085 pmc_prev = pmc;
1086 }
1087 if (pmc) {
1088 if (pmc_prev)
1089 pmc_prev->next = pmc->next;
1090 else
1091 in_dev->mc_tomb = pmc->next;
1092 }
1093 spin_unlock_bh(&in_dev->mc_tomb_lock);
1094 if (pmc) {
1095 for (psf=pmc->tomb; psf; psf=psf_next) {
1096 psf_next = psf->sf_next;
1097 kfree(psf);
1098 }
1099 in_dev_put(pmc->interface);
1100 kfree(pmc);
1101 }
1102 }
1103
1104 static void igmpv3_clear_delrec(struct in_device *in_dev)
1105 {
1106 struct ip_mc_list *pmc, *nextpmc;
1107
1108 spin_lock_bh(&in_dev->mc_tomb_lock);
1109 pmc = in_dev->mc_tomb;
1110 in_dev->mc_tomb = NULL;
1111 spin_unlock_bh(&in_dev->mc_tomb_lock);
1112
1113 for (; pmc; pmc = nextpmc) {
1114 nextpmc = pmc->next;
1115 ip_mc_clear_src(pmc);
1116 in_dev_put(pmc->interface);
1117 kfree(pmc);
1118 }
1119 /* clear dead sources, too */
1120 rcu_read_lock();
1121 for_each_pmc_rcu(in_dev, pmc) {
1122 struct ip_sf_list *psf, *psf_next;
1123
1124 spin_lock_bh(&pmc->lock);
1125 psf = pmc->tomb;
1126 pmc->tomb = NULL;
1127 spin_unlock_bh(&pmc->lock);
1128 for (; psf; psf=psf_next) {
1129 psf_next = psf->sf_next;
1130 kfree(psf);
1131 }
1132 }
1133 rcu_read_unlock();
1134 }
1135 #endif
1136
1137 static void igmp_group_dropped(struct ip_mc_list *im)
1138 {
1139 struct in_device *in_dev = im->interface;
1140 #ifdef CONFIG_IP_MULTICAST
1141 int reporter;
1142 #endif
1143
1144 if (im->loaded) {
1145 im->loaded = 0;
1146 ip_mc_filter_del(in_dev, im->multiaddr);
1147 }
1148
1149 #ifdef CONFIG_IP_MULTICAST
1150 if (im->multiaddr == IGMP_ALL_HOSTS)
1151 return;
1152
1153 reporter = im->reporter;
1154 igmp_stop_timer(im);
1155
1156 if (!in_dev->dead) {
1157 if (IGMP_V1_SEEN(in_dev))
1158 goto done;
1159 if (IGMP_V2_SEEN(in_dev)) {
1160 if (reporter)
1161 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1162 goto done;
1163 }
1164 /* IGMPv3 */
1165 igmpv3_add_delrec(in_dev, im);
1166
1167 igmp_ifc_event(in_dev);
1168 }
1169 done:
1170 #endif
1171 ip_mc_clear_src(im);
1172 }
1173
1174 static void igmp_group_added(struct ip_mc_list *im)
1175 {
1176 struct in_device *in_dev = im->interface;
1177
1178 if (im->loaded == 0) {
1179 im->loaded = 1;
1180 ip_mc_filter_add(in_dev, im->multiaddr);
1181 }
1182
1183 #ifdef CONFIG_IP_MULTICAST
1184 if (im->multiaddr == IGMP_ALL_HOSTS)
1185 return;
1186
1187 if (in_dev->dead)
1188 return;
1189 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1190 spin_lock_bh(&im->lock);
1191 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1192 spin_unlock_bh(&im->lock);
1193 return;
1194 }
1195 /* else, v3 */
1196
1197 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1198 IGMP_Unsolicited_Report_Count;
1199 igmp_ifc_event(in_dev);
1200 #endif
1201 }
1202
1203
1204 /*
1205 * Multicast list managers
1206 */
1207
1208
1209 /*
1210 * A socket has joined a multicast group on device dev.
1211 */
1212
1213 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1214 {
1215 struct ip_mc_list *im;
1216
1217 ASSERT_RTNL();
1218
1219 for_each_pmc_rtnl(in_dev, im) {
1220 if (im->multiaddr == addr) {
1221 im->users++;
1222 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1223 goto out;
1224 }
1225 }
1226
1227 im = kzalloc(sizeof(*im), GFP_KERNEL);
1228 if (!im)
1229 goto out;
1230
1231 im->users = 1;
1232 im->interface = in_dev;
1233 in_dev_hold(in_dev);
1234 im->multiaddr = addr;
1235 /* initial mode is (EX, empty) */
1236 im->sfmode = MCAST_EXCLUDE;
1237 im->sfcount[MCAST_EXCLUDE] = 1;
1238 atomic_set(&im->refcnt, 1);
1239 spin_lock_init(&im->lock);
1240 #ifdef CONFIG_IP_MULTICAST
1241 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1242 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1243 #endif
1244
1245 im->next_rcu = in_dev->mc_list;
1246 in_dev->mc_count++;
1247 rcu_assign_pointer(in_dev->mc_list, im);
1248
1249 #ifdef CONFIG_IP_MULTICAST
1250 igmpv3_del_delrec(in_dev, im->multiaddr);
1251 #endif
1252 igmp_group_added(im);
1253 if (!in_dev->dead)
1254 ip_rt_multicast_event(in_dev);
1255 out:
1256 return;
1257 }
1258 EXPORT_SYMBOL(ip_mc_inc_group);
1259
1260 /*
1261 * Resend IGMP JOIN report; used for bonding.
1262 * Called with rcu_read_lock()
1263 */
1264 void ip_mc_rejoin_groups(struct in_device *in_dev)
1265 {
1266 #ifdef CONFIG_IP_MULTICAST
1267 struct ip_mc_list *im;
1268 int type;
1269
1270 for_each_pmc_rcu(in_dev, im) {
1271 if (im->multiaddr == IGMP_ALL_HOSTS)
1272 continue;
1273
1274 /* a failover is happening and switches
1275 * must be notified immediately
1276 */
1277 if (IGMP_V1_SEEN(in_dev))
1278 type = IGMP_HOST_MEMBERSHIP_REPORT;
1279 else if (IGMP_V2_SEEN(in_dev))
1280 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1281 else
1282 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1283 igmp_send_report(in_dev, im, type);
1284 }
1285 #endif
1286 }
1287 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1288
1289 /*
1290 * A socket has left a multicast group on device dev
1291 */
1292
1293 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1294 {
1295 struct ip_mc_list *i;
1296 struct ip_mc_list __rcu **ip;
1297
1298 ASSERT_RTNL();
1299
1300 for (ip = &in_dev->mc_list;
1301 (i = rtnl_dereference(*ip)) != NULL;
1302 ip = &i->next_rcu) {
1303 if (i->multiaddr == addr) {
1304 if (--i->users == 0) {
1305 *ip = i->next_rcu;
1306 in_dev->mc_count--;
1307 igmp_group_dropped(i);
1308
1309 if (!in_dev->dead)
1310 ip_rt_multicast_event(in_dev);
1311
1312 ip_ma_put(i);
1313 return;
1314 }
1315 break;
1316 }
1317 }
1318 }
1319 EXPORT_SYMBOL(ip_mc_dec_group);
1320
1321 /* Device changing type */
1322
1323 void ip_mc_unmap(struct in_device *in_dev)
1324 {
1325 struct ip_mc_list *pmc;
1326
1327 ASSERT_RTNL();
1328
1329 for_each_pmc_rtnl(in_dev, pmc)
1330 igmp_group_dropped(pmc);
1331 }
1332
1333 void ip_mc_remap(struct in_device *in_dev)
1334 {
1335 struct ip_mc_list *pmc;
1336
1337 ASSERT_RTNL();
1338
1339 for_each_pmc_rtnl(in_dev, pmc)
1340 igmp_group_added(pmc);
1341 }
1342
1343 /* Device going down */
1344
1345 void ip_mc_down(struct in_device *in_dev)
1346 {
1347 struct ip_mc_list *pmc;
1348
1349 ASSERT_RTNL();
1350
1351 for_each_pmc_rtnl(in_dev, pmc)
1352 igmp_group_dropped(pmc);
1353
1354 #ifdef CONFIG_IP_MULTICAST
1355 in_dev->mr_ifc_count = 0;
1356 if (del_timer(&in_dev->mr_ifc_timer))
1357 __in_dev_put(in_dev);
1358 in_dev->mr_gq_running = 0;
1359 if (del_timer(&in_dev->mr_gq_timer))
1360 __in_dev_put(in_dev);
1361 igmpv3_clear_delrec(in_dev);
1362 #endif
1363
1364 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1365 }
1366
1367 void ip_mc_init_dev(struct in_device *in_dev)
1368 {
1369 ASSERT_RTNL();
1370
1371 in_dev->mc_tomb = NULL;
1372 #ifdef CONFIG_IP_MULTICAST
1373 in_dev->mr_gq_running = 0;
1374 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1375 (unsigned long)in_dev);
1376 in_dev->mr_ifc_count = 0;
1377 in_dev->mc_count = 0;
1378 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1379 (unsigned long)in_dev);
1380 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1381 #endif
1382
1383 spin_lock_init(&in_dev->mc_tomb_lock);
1384 }
1385
1386 /* Device going up */
1387
1388 void ip_mc_up(struct in_device *in_dev)
1389 {
1390 struct ip_mc_list *pmc;
1391
1392 ASSERT_RTNL();
1393
1394 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1395
1396 for_each_pmc_rtnl(in_dev, pmc)
1397 igmp_group_added(pmc);
1398 }
1399
1400 /*
1401 * Device is about to be destroyed: clean up.
1402 */
1403
1404 void ip_mc_destroy_dev(struct in_device *in_dev)
1405 {
1406 struct ip_mc_list *i;
1407
1408 ASSERT_RTNL();
1409
1410 /* Deactivate timers */
1411 ip_mc_down(in_dev);
1412
1413 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1414 in_dev->mc_list = i->next_rcu;
1415 in_dev->mc_count--;
1416
1417 igmp_group_dropped(i);
1418 ip_ma_put(i);
1419 }
1420 }
1421
1422 /* RTNL is locked */
1423 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1424 {
1425 struct net_device *dev = NULL;
1426 struct in_device *idev = NULL;
1427
1428 if (imr->imr_ifindex) {
1429 idev = inetdev_by_index(net, imr->imr_ifindex);
1430 return idev;
1431 }
1432 if (imr->imr_address.s_addr) {
1433 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1434 if (!dev)
1435 return NULL;
1436 }
1437
1438 if (!dev) {
1439 struct rtable *rt = ip_route_output(net,
1440 imr->imr_multiaddr.s_addr,
1441 0, 0, 0);
1442 if (!IS_ERR(rt)) {
1443 dev = rt->dst.dev;
1444 ip_rt_put(rt);
1445 }
1446 }
1447 if (dev) {
1448 imr->imr_ifindex = dev->ifindex;
1449 idev = __in_dev_get_rtnl(dev);
1450 }
1451 return idev;
1452 }
1453
1454 /*
1455 * Join a socket to a group
1456 */
1457 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1458 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1459
1460
1461 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1462 __be32 *psfsrc)
1463 {
1464 struct ip_sf_list *psf, *psf_prev;
1465 int rv = 0;
1466
1467 psf_prev = NULL;
1468 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1469 if (psf->sf_inaddr == *psfsrc)
1470 break;
1471 psf_prev = psf;
1472 }
1473 if (!psf || psf->sf_count[sfmode] == 0) {
1474 /* source filter not found, or count wrong => bug */
1475 return -ESRCH;
1476 }
1477 psf->sf_count[sfmode]--;
1478 if (psf->sf_count[sfmode] == 0) {
1479 ip_rt_multicast_event(pmc->interface);
1480 }
1481 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1482 #ifdef CONFIG_IP_MULTICAST
1483 struct in_device *in_dev = pmc->interface;
1484 #endif
1485
1486 /* no more filters for this source */
1487 if (psf_prev)
1488 psf_prev->sf_next = psf->sf_next;
1489 else
1490 pmc->sources = psf->sf_next;
1491 #ifdef CONFIG_IP_MULTICAST
1492 if (psf->sf_oldin &&
1493 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1494 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1495 IGMP_Unsolicited_Report_Count;
1496 psf->sf_next = pmc->tomb;
1497 pmc->tomb = psf;
1498 rv = 1;
1499 } else
1500 #endif
1501 kfree(psf);
1502 }
1503 return rv;
1504 }
1505
1506 #ifndef CONFIG_IP_MULTICAST
1507 #define igmp_ifc_event(x) do { } while (0)
1508 #endif
1509
1510 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1511 int sfcount, __be32 *psfsrc, int delta)
1512 {
1513 struct ip_mc_list *pmc;
1514 int changerec = 0;
1515 int i, err;
1516
1517 if (!in_dev)
1518 return -ENODEV;
1519 rcu_read_lock();
1520 for_each_pmc_rcu(in_dev, pmc) {
1521 if (*pmca == pmc->multiaddr)
1522 break;
1523 }
1524 if (!pmc) {
1525 /* MCA not found?? bug */
1526 rcu_read_unlock();
1527 return -ESRCH;
1528 }
1529 spin_lock_bh(&pmc->lock);
1530 rcu_read_unlock();
1531 #ifdef CONFIG_IP_MULTICAST
1532 sf_markstate(pmc);
1533 #endif
1534 if (!delta) {
1535 err = -EINVAL;
1536 if (!pmc->sfcount[sfmode])
1537 goto out_unlock;
1538 pmc->sfcount[sfmode]--;
1539 }
1540 err = 0;
1541 for (i=0; i<sfcount; i++) {
1542 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1543
1544 changerec |= rv > 0;
1545 if (!err && rv < 0)
1546 err = rv;
1547 }
1548 if (pmc->sfmode == MCAST_EXCLUDE &&
1549 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1550 pmc->sfcount[MCAST_INCLUDE]) {
1551 #ifdef CONFIG_IP_MULTICAST
1552 struct ip_sf_list *psf;
1553 #endif
1554
1555 /* filter mode change */
1556 pmc->sfmode = MCAST_INCLUDE;
1557 #ifdef CONFIG_IP_MULTICAST
1558 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1559 IGMP_Unsolicited_Report_Count;
1560 in_dev->mr_ifc_count = pmc->crcount;
1561 for (psf=pmc->sources; psf; psf = psf->sf_next)
1562 psf->sf_crcount = 0;
1563 igmp_ifc_event(pmc->interface);
1564 } else if (sf_setstate(pmc) || changerec) {
1565 igmp_ifc_event(pmc->interface);
1566 #endif
1567 }
1568 out_unlock:
1569 spin_unlock_bh(&pmc->lock);
1570 return err;
1571 }
1572
1573 /*
1574 * Add multicast single-source filter to the interface list
1575 */
1576 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1577 __be32 *psfsrc, int delta)
1578 {
1579 struct ip_sf_list *psf, *psf_prev;
1580
1581 psf_prev = NULL;
1582 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1583 if (psf->sf_inaddr == *psfsrc)
1584 break;
1585 psf_prev = psf;
1586 }
1587 if (!psf) {
1588 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1589 if (!psf)
1590 return -ENOBUFS;
1591 psf->sf_inaddr = *psfsrc;
1592 if (psf_prev) {
1593 psf_prev->sf_next = psf;
1594 } else
1595 pmc->sources = psf;
1596 }
1597 psf->sf_count[sfmode]++;
1598 if (psf->sf_count[sfmode] == 1) {
1599 ip_rt_multicast_event(pmc->interface);
1600 }
1601 return 0;
1602 }
1603
1604 #ifdef CONFIG_IP_MULTICAST
1605 static void sf_markstate(struct ip_mc_list *pmc)
1606 {
1607 struct ip_sf_list *psf;
1608 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1609
1610 for (psf=pmc->sources; psf; psf=psf->sf_next)
1611 if (pmc->sfcount[MCAST_EXCLUDE]) {
1612 psf->sf_oldin = mca_xcount ==
1613 psf->sf_count[MCAST_EXCLUDE] &&
1614 !psf->sf_count[MCAST_INCLUDE];
1615 } else
1616 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1617 }
1618
1619 static int sf_setstate(struct ip_mc_list *pmc)
1620 {
1621 struct ip_sf_list *psf, *dpsf;
1622 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1623 int qrv = pmc->interface->mr_qrv;
1624 int new_in, rv;
1625
1626 rv = 0;
1627 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1628 if (pmc->sfcount[MCAST_EXCLUDE]) {
1629 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1630 !psf->sf_count[MCAST_INCLUDE];
1631 } else
1632 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1633 if (new_in) {
1634 if (!psf->sf_oldin) {
1635 struct ip_sf_list *prev = NULL;
1636
1637 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1638 if (dpsf->sf_inaddr == psf->sf_inaddr)
1639 break;
1640 prev = dpsf;
1641 }
1642 if (dpsf) {
1643 if (prev)
1644 prev->sf_next = dpsf->sf_next;
1645 else
1646 pmc->tomb = dpsf->sf_next;
1647 kfree(dpsf);
1648 }
1649 psf->sf_crcount = qrv;
1650 rv++;
1651 }
1652 } else if (psf->sf_oldin) {
1653
1654 psf->sf_crcount = 0;
1655 /*
1656 * add or update "delete" records if an active filter
1657 * is now inactive
1658 */
1659 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1660 if (dpsf->sf_inaddr == psf->sf_inaddr)
1661 break;
1662 if (!dpsf) {
1663 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1664 if (!dpsf)
1665 continue;
1666 *dpsf = *psf;
1667 /* pmc->lock held by callers */
1668 dpsf->sf_next = pmc->tomb;
1669 pmc->tomb = dpsf;
1670 }
1671 dpsf->sf_crcount = qrv;
1672 rv++;
1673 }
1674 }
1675 return rv;
1676 }
1677 #endif
1678
1679 /*
1680 * Add multicast source filter list to the interface list
1681 */
1682 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1683 int sfcount, __be32 *psfsrc, int delta)
1684 {
1685 struct ip_mc_list *pmc;
1686 int isexclude;
1687 int i, err;
1688
1689 if (!in_dev)
1690 return -ENODEV;
1691 rcu_read_lock();
1692 for_each_pmc_rcu(in_dev, pmc) {
1693 if (*pmca == pmc->multiaddr)
1694 break;
1695 }
1696 if (!pmc) {
1697 /* MCA not found?? bug */
1698 rcu_read_unlock();
1699 return -ESRCH;
1700 }
1701 spin_lock_bh(&pmc->lock);
1702 rcu_read_unlock();
1703
1704 #ifdef CONFIG_IP_MULTICAST
1705 sf_markstate(pmc);
1706 #endif
1707 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1708 if (!delta)
1709 pmc->sfcount[sfmode]++;
1710 err = 0;
1711 for (i=0; i<sfcount; i++) {
1712 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1713 if (err)
1714 break;
1715 }
1716 if (err) {
1717 int j;
1718
1719 pmc->sfcount[sfmode]--;
1720 for (j=0; j<i; j++)
1721 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1722 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1723 #ifdef CONFIG_IP_MULTICAST
1724 struct ip_sf_list *psf;
1725 in_dev = pmc->interface;
1726 #endif
1727
1728 /* filter mode change */
1729 if (pmc->sfcount[MCAST_EXCLUDE])
1730 pmc->sfmode = MCAST_EXCLUDE;
1731 else if (pmc->sfcount[MCAST_INCLUDE])
1732 pmc->sfmode = MCAST_INCLUDE;
1733 #ifdef CONFIG_IP_MULTICAST
1734 /* else no filters; keep old mode for reports */
1735
1736 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1737 IGMP_Unsolicited_Report_Count;
1738 in_dev->mr_ifc_count = pmc->crcount;
1739 for (psf=pmc->sources; psf; psf = psf->sf_next)
1740 psf->sf_crcount = 0;
1741 igmp_ifc_event(in_dev);
1742 } else if (sf_setstate(pmc)) {
1743 igmp_ifc_event(in_dev);
1744 #endif
1745 }
1746 spin_unlock_bh(&pmc->lock);
1747 return err;
1748 }
1749
1750 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1751 {
1752 struct ip_sf_list *psf, *nextpsf;
1753
1754 for (psf=pmc->tomb; psf; psf=nextpsf) {
1755 nextpsf = psf->sf_next;
1756 kfree(psf);
1757 }
1758 pmc->tomb = NULL;
1759 for (psf=pmc->sources; psf; psf=nextpsf) {
1760 nextpsf = psf->sf_next;
1761 kfree(psf);
1762 }
1763 pmc->sources = NULL;
1764 pmc->sfmode = MCAST_EXCLUDE;
1765 pmc->sfcount[MCAST_INCLUDE] = 0;
1766 pmc->sfcount[MCAST_EXCLUDE] = 1;
1767 }
1768
1769
1770 /*
1771 * Join a multicast group
1772 */
1773 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1774 {
1775 int err;
1776 __be32 addr = imr->imr_multiaddr.s_addr;
1777 struct ip_mc_socklist *iml = NULL, *i;
1778 struct in_device *in_dev;
1779 struct inet_sock *inet = inet_sk(sk);
1780 struct net *net = sock_net(sk);
1781 int ifindex;
1782 int count = 0;
1783
1784 if (!ipv4_is_multicast(addr))
1785 return -EINVAL;
1786
1787 rtnl_lock();
1788
1789 in_dev = ip_mc_find_dev(net, imr);
1790
1791 if (!in_dev) {
1792 iml = NULL;
1793 err = -ENODEV;
1794 goto done;
1795 }
1796
1797 err = -EADDRINUSE;
1798 ifindex = imr->imr_ifindex;
1799 for_each_pmc_rtnl(inet, i) {
1800 if (i->multi.imr_multiaddr.s_addr == addr &&
1801 i->multi.imr_ifindex == ifindex)
1802 goto done;
1803 count++;
1804 }
1805 err = -ENOBUFS;
1806 if (count >= sysctl_igmp_max_memberships)
1807 goto done;
1808 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1809 if (iml == NULL)
1810 goto done;
1811
1812 memcpy(&iml->multi, imr, sizeof(*imr));
1813 iml->next_rcu = inet->mc_list;
1814 iml->sflist = NULL;
1815 iml->sfmode = MCAST_EXCLUDE;
1816 rcu_assign_pointer(inet->mc_list, iml);
1817 ip_mc_inc_group(in_dev, addr);
1818 err = 0;
1819 done:
1820 rtnl_unlock();
1821 return err;
1822 }
1823 EXPORT_SYMBOL(ip_mc_join_group);
1824
1825 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1826 struct in_device *in_dev)
1827 {
1828 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1829 int err;
1830
1831 if (psf == NULL) {
1832 /* any-source empty exclude case */
1833 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1834 iml->sfmode, 0, NULL, 0);
1835 }
1836 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1837 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1838 rcu_assign_pointer(iml->sflist, NULL);
1839 /* decrease mem now to avoid the memleak warning */
1840 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1841 kfree_rcu(psf, rcu);
1842 return err;
1843 }
1844
1845 /*
1846 * Ask a socket to leave a group.
1847 */
1848
1849 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1850 {
1851 struct inet_sock *inet = inet_sk(sk);
1852 struct ip_mc_socklist *iml;
1853 struct ip_mc_socklist __rcu **imlp;
1854 struct in_device *in_dev;
1855 struct net *net = sock_net(sk);
1856 __be32 group = imr->imr_multiaddr.s_addr;
1857 u32 ifindex;
1858 int ret = -EADDRNOTAVAIL;
1859
1860 rtnl_lock();
1861 in_dev = ip_mc_find_dev(net, imr);
1862 ifindex = imr->imr_ifindex;
1863 for (imlp = &inet->mc_list;
1864 (iml = rtnl_dereference(*imlp)) != NULL;
1865 imlp = &iml->next_rcu) {
1866 if (iml->multi.imr_multiaddr.s_addr != group)
1867 continue;
1868 if (ifindex) {
1869 if (iml->multi.imr_ifindex != ifindex)
1870 continue;
1871 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1872 iml->multi.imr_address.s_addr)
1873 continue;
1874
1875 (void) ip_mc_leave_src(sk, iml, in_dev);
1876
1877 *imlp = iml->next_rcu;
1878
1879 if (in_dev)
1880 ip_mc_dec_group(in_dev, group);
1881 rtnl_unlock();
1882 /* decrease mem now to avoid the memleak warning */
1883 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1884 kfree_rcu(iml, rcu);
1885 return 0;
1886 }
1887 if (!in_dev)
1888 ret = -ENODEV;
1889 rtnl_unlock();
1890 return ret;
1891 }
1892
1893 int ip_mc_source(int add, int omode, struct sock *sk, struct
1894 ip_mreq_source *mreqs, int ifindex)
1895 {
1896 int err;
1897 struct ip_mreqn imr;
1898 __be32 addr = mreqs->imr_multiaddr;
1899 struct ip_mc_socklist *pmc;
1900 struct in_device *in_dev = NULL;
1901 struct inet_sock *inet = inet_sk(sk);
1902 struct ip_sf_socklist *psl;
1903 struct net *net = sock_net(sk);
1904 int leavegroup = 0;
1905 int i, j, rv;
1906
1907 if (!ipv4_is_multicast(addr))
1908 return -EINVAL;
1909
1910 rtnl_lock();
1911
1912 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1913 imr.imr_address.s_addr = mreqs->imr_interface;
1914 imr.imr_ifindex = ifindex;
1915 in_dev = ip_mc_find_dev(net, &imr);
1916
1917 if (!in_dev) {
1918 err = -ENODEV;
1919 goto done;
1920 }
1921 err = -EADDRNOTAVAIL;
1922
1923 for_each_pmc_rtnl(inet, pmc) {
1924 if ((pmc->multi.imr_multiaddr.s_addr ==
1925 imr.imr_multiaddr.s_addr) &&
1926 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1927 break;
1928 }
1929 if (!pmc) { /* must have a prior join */
1930 err = -EINVAL;
1931 goto done;
1932 }
1933 /* if a source filter was set, must be the same mode as before */
1934 if (pmc->sflist) {
1935 if (pmc->sfmode != omode) {
1936 err = -EINVAL;
1937 goto done;
1938 }
1939 } else if (pmc->sfmode != omode) {
1940 /* allow mode switches for empty-set filters */
1941 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1942 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1943 NULL, 0);
1944 pmc->sfmode = omode;
1945 }
1946
1947 psl = rtnl_dereference(pmc->sflist);
1948 if (!add) {
1949 if (!psl)
1950 goto done; /* err = -EADDRNOTAVAIL */
1951 rv = !0;
1952 for (i=0; i<psl->sl_count; i++) {
1953 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1954 sizeof(__be32));
1955 if (rv == 0)
1956 break;
1957 }
1958 if (rv) /* source not found */
1959 goto done; /* err = -EADDRNOTAVAIL */
1960
1961 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1962 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1963 leavegroup = 1;
1964 goto done;
1965 }
1966
1967 /* update the interface filter */
1968 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1969 &mreqs->imr_sourceaddr, 1);
1970
1971 for (j=i+1; j<psl->sl_count; j++)
1972 psl->sl_addr[j-1] = psl->sl_addr[j];
1973 psl->sl_count--;
1974 err = 0;
1975 goto done;
1976 }
1977 /* else, add a new source to the filter */
1978
1979 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1980 err = -ENOBUFS;
1981 goto done;
1982 }
1983 if (!psl || psl->sl_count == psl->sl_max) {
1984 struct ip_sf_socklist *newpsl;
1985 int count = IP_SFBLOCK;
1986
1987 if (psl)
1988 count += psl->sl_max;
1989 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1990 if (!newpsl) {
1991 err = -ENOBUFS;
1992 goto done;
1993 }
1994 newpsl->sl_max = count;
1995 newpsl->sl_count = count - IP_SFBLOCK;
1996 if (psl) {
1997 for (i=0; i<psl->sl_count; i++)
1998 newpsl->sl_addr[i] = psl->sl_addr[i];
1999 /* decrease mem now to avoid the memleak warning */
2000 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2001 kfree_rcu(psl, rcu);
2002 }
2003 rcu_assign_pointer(pmc->sflist, newpsl);
2004 psl = newpsl;
2005 }
2006 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2007 for (i=0; i<psl->sl_count; i++) {
2008 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2009 sizeof(__be32));
2010 if (rv == 0)
2011 break;
2012 }
2013 if (rv == 0) /* address already there is an error */
2014 goto done;
2015 for (j=psl->sl_count-1; j>=i; j--)
2016 psl->sl_addr[j+1] = psl->sl_addr[j];
2017 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2018 psl->sl_count++;
2019 err = 0;
2020 /* update the interface list */
2021 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2022 &mreqs->imr_sourceaddr, 1);
2023 done:
2024 rtnl_unlock();
2025 if (leavegroup)
2026 return ip_mc_leave_group(sk, &imr);
2027 return err;
2028 }
2029
2030 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2031 {
2032 int err = 0;
2033 struct ip_mreqn imr;
2034 __be32 addr = msf->imsf_multiaddr;
2035 struct ip_mc_socklist *pmc;
2036 struct in_device *in_dev;
2037 struct inet_sock *inet = inet_sk(sk);
2038 struct ip_sf_socklist *newpsl, *psl;
2039 struct net *net = sock_net(sk);
2040 int leavegroup = 0;
2041
2042 if (!ipv4_is_multicast(addr))
2043 return -EINVAL;
2044 if (msf->imsf_fmode != MCAST_INCLUDE &&
2045 msf->imsf_fmode != MCAST_EXCLUDE)
2046 return -EINVAL;
2047
2048 rtnl_lock();
2049
2050 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2051 imr.imr_address.s_addr = msf->imsf_interface;
2052 imr.imr_ifindex = ifindex;
2053 in_dev = ip_mc_find_dev(net, &imr);
2054
2055 if (!in_dev) {
2056 err = -ENODEV;
2057 goto done;
2058 }
2059
2060 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2061 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2062 leavegroup = 1;
2063 goto done;
2064 }
2065
2066 for_each_pmc_rtnl(inet, pmc) {
2067 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2068 pmc->multi.imr_ifindex == imr.imr_ifindex)
2069 break;
2070 }
2071 if (!pmc) { /* must have a prior join */
2072 err = -EINVAL;
2073 goto done;
2074 }
2075 if (msf->imsf_numsrc) {
2076 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2077 GFP_KERNEL);
2078 if (!newpsl) {
2079 err = -ENOBUFS;
2080 goto done;
2081 }
2082 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2083 memcpy(newpsl->sl_addr, msf->imsf_slist,
2084 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2085 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2086 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2087 if (err) {
2088 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2089 goto done;
2090 }
2091 } else {
2092 newpsl = NULL;
2093 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2094 msf->imsf_fmode, 0, NULL, 0);
2095 }
2096 psl = rtnl_dereference(pmc->sflist);
2097 if (psl) {
2098 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2099 psl->sl_count, psl->sl_addr, 0);
2100 /* decrease mem now to avoid the memleak warning */
2101 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2102 kfree_rcu(psl, rcu);
2103 } else
2104 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2105 0, NULL, 0);
2106 rcu_assign_pointer(pmc->sflist, newpsl);
2107 pmc->sfmode = msf->imsf_fmode;
2108 err = 0;
2109 done:
2110 rtnl_unlock();
2111 if (leavegroup)
2112 err = ip_mc_leave_group(sk, &imr);
2113 return err;
2114 }
2115
2116 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2117 struct ip_msfilter __user *optval, int __user *optlen)
2118 {
2119 int err, len, count, copycount;
2120 struct ip_mreqn imr;
2121 __be32 addr = msf->imsf_multiaddr;
2122 struct ip_mc_socklist *pmc;
2123 struct in_device *in_dev;
2124 struct inet_sock *inet = inet_sk(sk);
2125 struct ip_sf_socklist *psl;
2126 struct net *net = sock_net(sk);
2127
2128 if (!ipv4_is_multicast(addr))
2129 return -EINVAL;
2130
2131 rtnl_lock();
2132
2133 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2134 imr.imr_address.s_addr = msf->imsf_interface;
2135 imr.imr_ifindex = 0;
2136 in_dev = ip_mc_find_dev(net, &imr);
2137
2138 if (!in_dev) {
2139 err = -ENODEV;
2140 goto done;
2141 }
2142 err = -EADDRNOTAVAIL;
2143
2144 for_each_pmc_rtnl(inet, pmc) {
2145 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2146 pmc->multi.imr_ifindex == imr.imr_ifindex)
2147 break;
2148 }
2149 if (!pmc) /* must have a prior join */
2150 goto done;
2151 msf->imsf_fmode = pmc->sfmode;
2152 psl = rtnl_dereference(pmc->sflist);
2153 rtnl_unlock();
2154 if (!psl) {
2155 len = 0;
2156 count = 0;
2157 } else {
2158 count = psl->sl_count;
2159 }
2160 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2161 len = copycount * sizeof(psl->sl_addr[0]);
2162 msf->imsf_numsrc = count;
2163 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2164 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2165 return -EFAULT;
2166 }
2167 if (len &&
2168 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2169 return -EFAULT;
2170 return 0;
2171 done:
2172 rtnl_unlock();
2173 return err;
2174 }
2175
2176 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2177 struct group_filter __user *optval, int __user *optlen)
2178 {
2179 int err, i, count, copycount;
2180 struct sockaddr_in *psin;
2181 __be32 addr;
2182 struct ip_mc_socklist *pmc;
2183 struct inet_sock *inet = inet_sk(sk);
2184 struct ip_sf_socklist *psl;
2185
2186 psin = (struct sockaddr_in *)&gsf->gf_group;
2187 if (psin->sin_family != AF_INET)
2188 return -EINVAL;
2189 addr = psin->sin_addr.s_addr;
2190 if (!ipv4_is_multicast(addr))
2191 return -EINVAL;
2192
2193 rtnl_lock();
2194
2195 err = -EADDRNOTAVAIL;
2196
2197 for_each_pmc_rtnl(inet, pmc) {
2198 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2199 pmc->multi.imr_ifindex == gsf->gf_interface)
2200 break;
2201 }
2202 if (!pmc) /* must have a prior join */
2203 goto done;
2204 gsf->gf_fmode = pmc->sfmode;
2205 psl = rtnl_dereference(pmc->sflist);
2206 rtnl_unlock();
2207 count = psl ? psl->sl_count : 0;
2208 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2209 gsf->gf_numsrc = count;
2210 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2211 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2212 return -EFAULT;
2213 }
2214 for (i=0; i<copycount; i++) {
2215 struct sockaddr_storage ss;
2216
2217 psin = (struct sockaddr_in *)&ss;
2218 memset(&ss, 0, sizeof(ss));
2219 psin->sin_family = AF_INET;
2220 psin->sin_addr.s_addr = psl->sl_addr[i];
2221 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2222 return -EFAULT;
2223 }
2224 return 0;
2225 done:
2226 rtnl_unlock();
2227 return err;
2228 }
2229
2230 /*
2231 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2232 */
2233 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2234 {
2235 struct inet_sock *inet = inet_sk(sk);
2236 struct ip_mc_socklist *pmc;
2237 struct ip_sf_socklist *psl;
2238 int i;
2239 int ret;
2240
2241 ret = 1;
2242 if (!ipv4_is_multicast(loc_addr))
2243 goto out;
2244
2245 rcu_read_lock();
2246 for_each_pmc_rcu(inet, pmc) {
2247 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2248 pmc->multi.imr_ifindex == dif)
2249 break;
2250 }
2251 ret = inet->mc_all;
2252 if (!pmc)
2253 goto unlock;
2254 psl = rcu_dereference(pmc->sflist);
2255 ret = (pmc->sfmode == MCAST_EXCLUDE);
2256 if (!psl)
2257 goto unlock;
2258
2259 for (i=0; i<psl->sl_count; i++) {
2260 if (psl->sl_addr[i] == rmt_addr)
2261 break;
2262 }
2263 ret = 0;
2264 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2265 goto unlock;
2266 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2267 goto unlock;
2268 ret = 1;
2269 unlock:
2270 rcu_read_unlock();
2271 out:
2272 return ret;
2273 }
2274
2275 /*
2276 * A socket is closing.
2277 */
2278
2279 void ip_mc_drop_socket(struct sock *sk)
2280 {
2281 struct inet_sock *inet = inet_sk(sk);
2282 struct ip_mc_socklist *iml;
2283 struct net *net = sock_net(sk);
2284
2285 if (inet->mc_list == NULL)
2286 return;
2287
2288 rtnl_lock();
2289 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2290 struct in_device *in_dev;
2291
2292 inet->mc_list = iml->next_rcu;
2293 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2294 (void) ip_mc_leave_src(sk, iml, in_dev);
2295 if (in_dev != NULL)
2296 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2297 /* decrease mem now to avoid the memleak warning */
2298 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2299 kfree_rcu(iml, rcu);
2300 }
2301 rtnl_unlock();
2302 }
2303
2304 /* called with rcu_read_lock() */
2305 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2306 {
2307 struct ip_mc_list *im;
2308 struct ip_sf_list *psf;
2309 int rv = 0;
2310
2311 for_each_pmc_rcu(in_dev, im) {
2312 if (im->multiaddr == mc_addr)
2313 break;
2314 }
2315 if (im && proto == IPPROTO_IGMP) {
2316 rv = 1;
2317 } else if (im) {
2318 if (src_addr) {
2319 for (psf=im->sources; psf; psf=psf->sf_next) {
2320 if (psf->sf_inaddr == src_addr)
2321 break;
2322 }
2323 if (psf)
2324 rv = psf->sf_count[MCAST_INCLUDE] ||
2325 psf->sf_count[MCAST_EXCLUDE] !=
2326 im->sfcount[MCAST_EXCLUDE];
2327 else
2328 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2329 } else
2330 rv = 1; /* unspecified source; tentatively allow */
2331 }
2332 return rv;
2333 }
2334
2335 #if defined(CONFIG_PROC_FS)
2336 struct igmp_mc_iter_state {
2337 struct seq_net_private p;
2338 struct net_device *dev;
2339 struct in_device *in_dev;
2340 };
2341
2342 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2343
2344 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2345 {
2346 struct net *net = seq_file_net(seq);
2347 struct ip_mc_list *im = NULL;
2348 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2349
2350 state->in_dev = NULL;
2351 for_each_netdev_rcu(net, state->dev) {
2352 struct in_device *in_dev;
2353
2354 in_dev = __in_dev_get_rcu(state->dev);
2355 if (!in_dev)
2356 continue;
2357 im = rcu_dereference(in_dev->mc_list);
2358 if (im) {
2359 state->in_dev = in_dev;
2360 break;
2361 }
2362 }
2363 return im;
2364 }
2365
2366 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2367 {
2368 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2369
2370 im = rcu_dereference(im->next_rcu);
2371 while (!im) {
2372 state->dev = next_net_device_rcu(state->dev);
2373 if (!state->dev) {
2374 state->in_dev = NULL;
2375 break;
2376 }
2377 state->in_dev = __in_dev_get_rcu(state->dev);
2378 if (!state->in_dev)
2379 continue;
2380 im = rcu_dereference(state->in_dev->mc_list);
2381 }
2382 return im;
2383 }
2384
2385 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2386 {
2387 struct ip_mc_list *im = igmp_mc_get_first(seq);
2388 if (im)
2389 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2390 --pos;
2391 return pos ? NULL : im;
2392 }
2393
2394 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2395 __acquires(rcu)
2396 {
2397 rcu_read_lock();
2398 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2399 }
2400
2401 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2402 {
2403 struct ip_mc_list *im;
2404 if (v == SEQ_START_TOKEN)
2405 im = igmp_mc_get_first(seq);
2406 else
2407 im = igmp_mc_get_next(seq, v);
2408 ++*pos;
2409 return im;
2410 }
2411
2412 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2413 __releases(rcu)
2414 {
2415 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2416
2417 state->in_dev = NULL;
2418 state->dev = NULL;
2419 rcu_read_unlock();
2420 }
2421
2422 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2423 {
2424 if (v == SEQ_START_TOKEN)
2425 seq_puts(seq,
2426 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2427 else {
2428 struct ip_mc_list *im = (struct ip_mc_list *)v;
2429 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2430 char *querier;
2431 #ifdef CONFIG_IP_MULTICAST
2432 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2433 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2434 "V3";
2435 #else
2436 querier = "NONE";
2437 #endif
2438
2439 if (rcu_dereference(state->in_dev->mc_list) == im) {
2440 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2441 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2442 }
2443
2444 seq_printf(seq,
2445 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2446 im->multiaddr, im->users,
2447 im->tm_running, im->tm_running ?
2448 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2449 im->reporter);
2450 }
2451 return 0;
2452 }
2453
2454 static const struct seq_operations igmp_mc_seq_ops = {
2455 .start = igmp_mc_seq_start,
2456 .next = igmp_mc_seq_next,
2457 .stop = igmp_mc_seq_stop,
2458 .show = igmp_mc_seq_show,
2459 };
2460
2461 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2462 {
2463 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2464 sizeof(struct igmp_mc_iter_state));
2465 }
2466
2467 static const struct file_operations igmp_mc_seq_fops = {
2468 .owner = THIS_MODULE,
2469 .open = igmp_mc_seq_open,
2470 .read = seq_read,
2471 .llseek = seq_lseek,
2472 .release = seq_release_net,
2473 };
2474
2475 struct igmp_mcf_iter_state {
2476 struct seq_net_private p;
2477 struct net_device *dev;
2478 struct in_device *idev;
2479 struct ip_mc_list *im;
2480 };
2481
2482 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2483
2484 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2485 {
2486 struct net *net = seq_file_net(seq);
2487 struct ip_sf_list *psf = NULL;
2488 struct ip_mc_list *im = NULL;
2489 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2490
2491 state->idev = NULL;
2492 state->im = NULL;
2493 for_each_netdev_rcu(net, state->dev) {
2494 struct in_device *idev;
2495 idev = __in_dev_get_rcu(state->dev);
2496 if (unlikely(idev == NULL))
2497 continue;
2498 im = rcu_dereference(idev->mc_list);
2499 if (likely(im != NULL)) {
2500 spin_lock_bh(&im->lock);
2501 psf = im->sources;
2502 if (likely(psf != NULL)) {
2503 state->im = im;
2504 state->idev = idev;
2505 break;
2506 }
2507 spin_unlock_bh(&im->lock);
2508 }
2509 }
2510 return psf;
2511 }
2512
2513 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2514 {
2515 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2516
2517 psf = psf->sf_next;
2518 while (!psf) {
2519 spin_unlock_bh(&state->im->lock);
2520 state->im = state->im->next;
2521 while (!state->im) {
2522 state->dev = next_net_device_rcu(state->dev);
2523 if (!state->dev) {
2524 state->idev = NULL;
2525 goto out;
2526 }
2527 state->idev = __in_dev_get_rcu(state->dev);
2528 if (!state->idev)
2529 continue;
2530 state->im = rcu_dereference(state->idev->mc_list);
2531 }
2532 if (!state->im)
2533 break;
2534 spin_lock_bh(&state->im->lock);
2535 psf = state->im->sources;
2536 }
2537 out:
2538 return psf;
2539 }
2540
2541 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2542 {
2543 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2544 if (psf)
2545 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2546 --pos;
2547 return pos ? NULL : psf;
2548 }
2549
2550 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2551 __acquires(rcu)
2552 {
2553 rcu_read_lock();
2554 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2555 }
2556
2557 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2558 {
2559 struct ip_sf_list *psf;
2560 if (v == SEQ_START_TOKEN)
2561 psf = igmp_mcf_get_first(seq);
2562 else
2563 psf = igmp_mcf_get_next(seq, v);
2564 ++*pos;
2565 return psf;
2566 }
2567
2568 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2569 __releases(rcu)
2570 {
2571 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2572 if (likely(state->im != NULL)) {
2573 spin_unlock_bh(&state->im->lock);
2574 state->im = NULL;
2575 }
2576 state->idev = NULL;
2577 state->dev = NULL;
2578 rcu_read_unlock();
2579 }
2580
2581 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2582 {
2583 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2584 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2585
2586 if (v == SEQ_START_TOKEN) {
2587 seq_printf(seq,
2588 "%3s %6s "
2589 "%10s %10s %6s %6s\n", "Idx",
2590 "Device", "MCA",
2591 "SRC", "INC", "EXC");
2592 } else {
2593 seq_printf(seq,
2594 "%3d %6.6s 0x%08x "
2595 "0x%08x %6lu %6lu\n",
2596 state->dev->ifindex, state->dev->name,
2597 ntohl(state->im->multiaddr),
2598 ntohl(psf->sf_inaddr),
2599 psf->sf_count[MCAST_INCLUDE],
2600 psf->sf_count[MCAST_EXCLUDE]);
2601 }
2602 return 0;
2603 }
2604
2605 static const struct seq_operations igmp_mcf_seq_ops = {
2606 .start = igmp_mcf_seq_start,
2607 .next = igmp_mcf_seq_next,
2608 .stop = igmp_mcf_seq_stop,
2609 .show = igmp_mcf_seq_show,
2610 };
2611
2612 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2613 {
2614 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2615 sizeof(struct igmp_mcf_iter_state));
2616 }
2617
2618 static const struct file_operations igmp_mcf_seq_fops = {
2619 .owner = THIS_MODULE,
2620 .open = igmp_mcf_seq_open,
2621 .read = seq_read,
2622 .llseek = seq_lseek,
2623 .release = seq_release_net,
2624 };
2625
2626 static int __net_init igmp_net_init(struct net *net)
2627 {
2628 struct proc_dir_entry *pde;
2629
2630 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2631 if (!pde)
2632 goto out_igmp;
2633 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2634 if (!pde)
2635 goto out_mcfilter;
2636 return 0;
2637
2638 out_mcfilter:
2639 proc_net_remove(net, "igmp");
2640 out_igmp:
2641 return -ENOMEM;
2642 }
2643
2644 static void __net_exit igmp_net_exit(struct net *net)
2645 {
2646 proc_net_remove(net, "mcfilter");
2647 proc_net_remove(net, "igmp");
2648 }
2649
2650 static struct pernet_operations igmp_net_ops = {
2651 .init = igmp_net_init,
2652 .exit = igmp_net_exit,
2653 };
2654
2655 int __init igmp_mc_proc_init(void)
2656 {
2657 return register_pernet_subsys(&igmp_net_ops);
2658 }
2659 #endif
linux-next