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USB: Add USB-ID for Multiplex RC serial adapter to cp210x.c
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv4 / igmp.c
blobb2ca095cb9dab36a4eb6e8da7308c4e55a6437cc
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 (psf->sf_count[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 ndo_set_rx_mode
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 return;
1159 if (IGMP_V2_SEEN(in_dev)) {
1160 if (reporter)
1161 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1162 return;
1163 }
1164 /* IGMPv3 */
1165 igmpv3_add_delrec(in_dev, im);
1166
1167 igmp_ifc_event(in_dev);
1168 }
1169 #endif
1170 }
1171
1172 static void igmp_group_added(struct ip_mc_list *im)
1173 {
1174 struct in_device *in_dev = im->interface;
1175
1176 if (im->loaded == 0) {
1177 im->loaded = 1;
1178 ip_mc_filter_add(in_dev, im->multiaddr);
1179 }
1180
1181 #ifdef CONFIG_IP_MULTICAST
1182 if (im->multiaddr == IGMP_ALL_HOSTS)
1183 return;
1184
1185 if (in_dev->dead)
1186 return;
1187 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1188 spin_lock_bh(&im->lock);
1189 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1190 spin_unlock_bh(&im->lock);
1191 return;
1192 }
1193 /* else, v3 */
1194
1195 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1196 IGMP_Unsolicited_Report_Count;
1197 igmp_ifc_event(in_dev);
1198 #endif
1199 }
1200
1201
1202 /*
1203 * Multicast list managers
1204 */
1205
1206
1207 /*
1208 * A socket has joined a multicast group on device dev.
1209 */
1210
1211 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1212 {
1213 struct ip_mc_list *im;
1214
1215 ASSERT_RTNL();
1216
1217 for_each_pmc_rtnl(in_dev, im) {
1218 if (im->multiaddr == addr) {
1219 im->users++;
1220 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1221 goto out;
1222 }
1223 }
1224
1225 im = kzalloc(sizeof(*im), GFP_KERNEL);
1226 if (!im)
1227 goto out;
1228
1229 im->users = 1;
1230 im->interface = in_dev;
1231 in_dev_hold(in_dev);
1232 im->multiaddr = addr;
1233 /* initial mode is (EX, empty) */
1234 im->sfmode = MCAST_EXCLUDE;
1235 im->sfcount[MCAST_EXCLUDE] = 1;
1236 atomic_set(&im->refcnt, 1);
1237 spin_lock_init(&im->lock);
1238 #ifdef CONFIG_IP_MULTICAST
1239 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1240 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1241 #endif
1242
1243 im->next_rcu = in_dev->mc_list;
1244 in_dev->mc_count++;
1245 RCU_INIT_POINTER(in_dev->mc_list, im);
1246
1247 #ifdef CONFIG_IP_MULTICAST
1248 igmpv3_del_delrec(in_dev, im->multiaddr);
1249 #endif
1250 igmp_group_added(im);
1251 if (!in_dev->dead)
1252 ip_rt_multicast_event(in_dev);
1253 out:
1254 return;
1255 }
1256 EXPORT_SYMBOL(ip_mc_inc_group);
1257
1258 /*
1259 * Resend IGMP JOIN report; used for bonding.
1260 * Called with rcu_read_lock()
1261 */
1262 void ip_mc_rejoin_groups(struct in_device *in_dev)
1263 {
1264 #ifdef CONFIG_IP_MULTICAST
1265 struct ip_mc_list *im;
1266 int type;
1267
1268 for_each_pmc_rcu(in_dev, im) {
1269 if (im->multiaddr == IGMP_ALL_HOSTS)
1270 continue;
1271
1272 /* a failover is happening and switches
1273 * must be notified immediately
1274 */
1275 if (IGMP_V1_SEEN(in_dev))
1276 type = IGMP_HOST_MEMBERSHIP_REPORT;
1277 else if (IGMP_V2_SEEN(in_dev))
1278 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1279 else
1280 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1281 igmp_send_report(in_dev, im, type);
1282 }
1283 #endif
1284 }
1285 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1286
1287 /*
1288 * A socket has left a multicast group on device dev
1289 */
1290
1291 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1292 {
1293 struct ip_mc_list *i;
1294 struct ip_mc_list __rcu **ip;
1295
1296 ASSERT_RTNL();
1297
1298 for (ip = &in_dev->mc_list;
1299 (i = rtnl_dereference(*ip)) != NULL;
1300 ip = &i->next_rcu) {
1301 if (i->multiaddr == addr) {
1302 if (--i->users == 0) {
1303 *ip = i->next_rcu;
1304 in_dev->mc_count--;
1305 igmp_group_dropped(i);
1306 ip_mc_clear_src(i);
1307
1308 if (!in_dev->dead)
1309 ip_rt_multicast_event(in_dev);
1310
1311 ip_ma_put(i);
1312 return;
1313 }
1314 break;
1315 }
1316 }
1317 }
1318 EXPORT_SYMBOL(ip_mc_dec_group);
1319
1320 /* Device changing type */
1321
1322 void ip_mc_unmap(struct in_device *in_dev)
1323 {
1324 struct ip_mc_list *pmc;
1325
1326 ASSERT_RTNL();
1327
1328 for_each_pmc_rtnl(in_dev, pmc)
1329 igmp_group_dropped(pmc);
1330 }
1331
1332 void ip_mc_remap(struct in_device *in_dev)
1333 {
1334 struct ip_mc_list *pmc;
1335
1336 ASSERT_RTNL();
1337
1338 for_each_pmc_rtnl(in_dev, pmc)
1339 igmp_group_added(pmc);
1340 }
1341
1342 /* Device going down */
1343
1344 void ip_mc_down(struct in_device *in_dev)
1345 {
1346 struct ip_mc_list *pmc;
1347
1348 ASSERT_RTNL();
1349
1350 for_each_pmc_rtnl(in_dev, pmc)
1351 igmp_group_dropped(pmc);
1352
1353 #ifdef CONFIG_IP_MULTICAST
1354 in_dev->mr_ifc_count = 0;
1355 if (del_timer(&in_dev->mr_ifc_timer))
1356 __in_dev_put(in_dev);
1357 in_dev->mr_gq_running = 0;
1358 if (del_timer(&in_dev->mr_gq_timer))
1359 __in_dev_put(in_dev);
1360 igmpv3_clear_delrec(in_dev);
1361 #endif
1362
1363 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1364 }
1365
1366 void ip_mc_init_dev(struct in_device *in_dev)
1367 {
1368 ASSERT_RTNL();
1369
1370 in_dev->mc_tomb = NULL;
1371 #ifdef CONFIG_IP_MULTICAST
1372 in_dev->mr_gq_running = 0;
1373 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1374 (unsigned long)in_dev);
1375 in_dev->mr_ifc_count = 0;
1376 in_dev->mc_count = 0;
1377 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1378 (unsigned long)in_dev);
1379 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1380 #endif
1381
1382 spin_lock_init(&in_dev->mc_tomb_lock);
1383 }
1384
1385 /* Device going up */
1386
1387 void ip_mc_up(struct in_device *in_dev)
1388 {
1389 struct ip_mc_list *pmc;
1390
1391 ASSERT_RTNL();
1392
1393 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1394
1395 for_each_pmc_rtnl(in_dev, pmc)
1396 igmp_group_added(pmc);
1397 }
1398
1399 /*
1400 * Device is about to be destroyed: clean up.
1401 */
1402
1403 void ip_mc_destroy_dev(struct in_device *in_dev)
1404 {
1405 struct ip_mc_list *i;
1406
1407 ASSERT_RTNL();
1408
1409 /* Deactivate timers */
1410 ip_mc_down(in_dev);
1411
1412 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1413 in_dev->mc_list = i->next_rcu;
1414 in_dev->mc_count--;
1415
1416 /* We've dropped the groups in ip_mc_down already */
1417 ip_mc_clear_src(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 if (!delta)
1720 pmc->sfcount[sfmode]--;
1721 for (j=0; j<i; j++)
1722 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1723 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1724 #ifdef CONFIG_IP_MULTICAST
1725 struct ip_sf_list *psf;
1726 in_dev = pmc->interface;
1727 #endif
1728
1729 /* filter mode change */
1730 if (pmc->sfcount[MCAST_EXCLUDE])
1731 pmc->sfmode = MCAST_EXCLUDE;
1732 else if (pmc->sfcount[MCAST_INCLUDE])
1733 pmc->sfmode = MCAST_INCLUDE;
1734 #ifdef CONFIG_IP_MULTICAST
1735 /* else no filters; keep old mode for reports */
1736
1737 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1738 IGMP_Unsolicited_Report_Count;
1739 in_dev->mr_ifc_count = pmc->crcount;
1740 for (psf=pmc->sources; psf; psf = psf->sf_next)
1741 psf->sf_crcount = 0;
1742 igmp_ifc_event(in_dev);
1743 } else if (sf_setstate(pmc)) {
1744 igmp_ifc_event(in_dev);
1745 #endif
1746 }
1747 spin_unlock_bh(&pmc->lock);
1748 return err;
1749 }
1750
1751 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1752 {
1753 struct ip_sf_list *psf, *nextpsf;
1754
1755 for (psf=pmc->tomb; psf; psf=nextpsf) {
1756 nextpsf = psf->sf_next;
1757 kfree(psf);
1758 }
1759 pmc->tomb = NULL;
1760 for (psf=pmc->sources; psf; psf=nextpsf) {
1761 nextpsf = psf->sf_next;
1762 kfree(psf);
1763 }
1764 pmc->sources = NULL;
1765 pmc->sfmode = MCAST_EXCLUDE;
1766 pmc->sfcount[MCAST_INCLUDE] = 0;
1767 pmc->sfcount[MCAST_EXCLUDE] = 1;
1768 }
1769
1770
1771 /*
1772 * Join a multicast group
1773 */
1774 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1775 {
1776 int err;
1777 __be32 addr = imr->imr_multiaddr.s_addr;
1778 struct ip_mc_socklist *iml = NULL, *i;
1779 struct in_device *in_dev;
1780 struct inet_sock *inet = inet_sk(sk);
1781 struct net *net = sock_net(sk);
1782 int ifindex;
1783 int count = 0;
1784
1785 if (!ipv4_is_multicast(addr))
1786 return -EINVAL;
1787
1788 rtnl_lock();
1789
1790 in_dev = ip_mc_find_dev(net, imr);
1791
1792 if (!in_dev) {
1793 iml = NULL;
1794 err = -ENODEV;
1795 goto done;
1796 }
1797
1798 err = -EADDRINUSE;
1799 ifindex = imr->imr_ifindex;
1800 for_each_pmc_rtnl(inet, i) {
1801 if (i->multi.imr_multiaddr.s_addr == addr &&
1802 i->multi.imr_ifindex == ifindex)
1803 goto done;
1804 count++;
1805 }
1806 err = -ENOBUFS;
1807 if (count >= sysctl_igmp_max_memberships)
1808 goto done;
1809 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1810 if (iml == NULL)
1811 goto done;
1812
1813 memcpy(&iml->multi, imr, sizeof(*imr));
1814 iml->next_rcu = inet->mc_list;
1815 iml->sflist = NULL;
1816 iml->sfmode = MCAST_EXCLUDE;
1817 RCU_INIT_POINTER(inet->mc_list, iml);
1818 ip_mc_inc_group(in_dev, addr);
1819 err = 0;
1820 done:
1821 rtnl_unlock();
1822 return err;
1823 }
1824 EXPORT_SYMBOL(ip_mc_join_group);
1825
1826 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1827 struct in_device *in_dev)
1828 {
1829 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1830 int err;
1831
1832 if (psf == NULL) {
1833 /* any-source empty exclude case */
1834 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1835 iml->sfmode, 0, NULL, 0);
1836 }
1837 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1838 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1839 RCU_INIT_POINTER(iml->sflist, NULL);
1840 /* decrease mem now to avoid the memleak warning */
1841 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1842 kfree_rcu(psf, rcu);
1843 return err;
1844 }
1845
1846 /*
1847 * Ask a socket to leave a group.
1848 */
1849
1850 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1851 {
1852 struct inet_sock *inet = inet_sk(sk);
1853 struct ip_mc_socklist *iml;
1854 struct ip_mc_socklist __rcu **imlp;
1855 struct in_device *in_dev;
1856 struct net *net = sock_net(sk);
1857 __be32 group = imr->imr_multiaddr.s_addr;
1858 u32 ifindex;
1859 int ret = -EADDRNOTAVAIL;
1860
1861 rtnl_lock();
1862 in_dev = ip_mc_find_dev(net, imr);
1863 ifindex = imr->imr_ifindex;
1864 for (imlp = &inet->mc_list;
1865 (iml = rtnl_dereference(*imlp)) != NULL;
1866 imlp = &iml->next_rcu) {
1867 if (iml->multi.imr_multiaddr.s_addr != group)
1868 continue;
1869 if (ifindex) {
1870 if (iml->multi.imr_ifindex != ifindex)
1871 continue;
1872 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1873 iml->multi.imr_address.s_addr)
1874 continue;
1875
1876 (void) ip_mc_leave_src(sk, iml, in_dev);
1877
1878 *imlp = iml->next_rcu;
1879
1880 if (in_dev)
1881 ip_mc_dec_group(in_dev, group);
1882 rtnl_unlock();
1883 /* decrease mem now to avoid the memleak warning */
1884 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1885 kfree_rcu(iml, rcu);
1886 return 0;
1887 }
1888 if (!in_dev)
1889 ret = -ENODEV;
1890 rtnl_unlock();
1891 return ret;
1892 }
1893
1894 int ip_mc_source(int add, int omode, struct sock *sk, struct
1895 ip_mreq_source *mreqs, int ifindex)
1896 {
1897 int err;
1898 struct ip_mreqn imr;
1899 __be32 addr = mreqs->imr_multiaddr;
1900 struct ip_mc_socklist *pmc;
1901 struct in_device *in_dev = NULL;
1902 struct inet_sock *inet = inet_sk(sk);
1903 struct ip_sf_socklist *psl;
1904 struct net *net = sock_net(sk);
1905 int leavegroup = 0;
1906 int i, j, rv;
1907
1908 if (!ipv4_is_multicast(addr))
1909 return -EINVAL;
1910
1911 rtnl_lock();
1912
1913 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1914 imr.imr_address.s_addr = mreqs->imr_interface;
1915 imr.imr_ifindex = ifindex;
1916 in_dev = ip_mc_find_dev(net, &imr);
1917
1918 if (!in_dev) {
1919 err = -ENODEV;
1920 goto done;
1921 }
1922 err = -EADDRNOTAVAIL;
1923
1924 for_each_pmc_rtnl(inet, pmc) {
1925 if ((pmc->multi.imr_multiaddr.s_addr ==
1926 imr.imr_multiaddr.s_addr) &&
1927 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1928 break;
1929 }
1930 if (!pmc) { /* must have a prior join */
1931 err = -EINVAL;
1932 goto done;
1933 }
1934 /* if a source filter was set, must be the same mode as before */
1935 if (pmc->sflist) {
1936 if (pmc->sfmode != omode) {
1937 err = -EINVAL;
1938 goto done;
1939 }
1940 } else if (pmc->sfmode != omode) {
1941 /* allow mode switches for empty-set filters */
1942 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1943 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1944 NULL, 0);
1945 pmc->sfmode = omode;
1946 }
1947
1948 psl = rtnl_dereference(pmc->sflist);
1949 if (!add) {
1950 if (!psl)
1951 goto done; /* err = -EADDRNOTAVAIL */
1952 rv = !0;
1953 for (i=0; i<psl->sl_count; i++) {
1954 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1955 sizeof(__be32));
1956 if (rv == 0)
1957 break;
1958 }
1959 if (rv) /* source not found */
1960 goto done; /* err = -EADDRNOTAVAIL */
1961
1962 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1963 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1964 leavegroup = 1;
1965 goto done;
1966 }
1967
1968 /* update the interface filter */
1969 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1970 &mreqs->imr_sourceaddr, 1);
1971
1972 for (j=i+1; j<psl->sl_count; j++)
1973 psl->sl_addr[j-1] = psl->sl_addr[j];
1974 psl->sl_count--;
1975 err = 0;
1976 goto done;
1977 }
1978 /* else, add a new source to the filter */
1979
1980 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1981 err = -ENOBUFS;
1982 goto done;
1983 }
1984 if (!psl || psl->sl_count == psl->sl_max) {
1985 struct ip_sf_socklist *newpsl;
1986 int count = IP_SFBLOCK;
1987
1988 if (psl)
1989 count += psl->sl_max;
1990 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1991 if (!newpsl) {
1992 err = -ENOBUFS;
1993 goto done;
1994 }
1995 newpsl->sl_max = count;
1996 newpsl->sl_count = count - IP_SFBLOCK;
1997 if (psl) {
1998 for (i=0; i<psl->sl_count; i++)
1999 newpsl->sl_addr[i] = psl->sl_addr[i];
2000 /* decrease mem now to avoid the memleak warning */
2001 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2002 kfree_rcu(psl, rcu);
2003 }
2004 RCU_INIT_POINTER(pmc->sflist, newpsl);
2005 psl = newpsl;
2006 }
2007 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2008 for (i=0; i<psl->sl_count; i++) {
2009 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2010 sizeof(__be32));
2011 if (rv == 0)
2012 break;
2013 }
2014 if (rv == 0) /* address already there is an error */
2015 goto done;
2016 for (j=psl->sl_count-1; j>=i; j--)
2017 psl->sl_addr[j+1] = psl->sl_addr[j];
2018 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2019 psl->sl_count++;
2020 err = 0;
2021 /* update the interface list */
2022 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2023 &mreqs->imr_sourceaddr, 1);
2024 done:
2025 rtnl_unlock();
2026 if (leavegroup)
2027 return ip_mc_leave_group(sk, &imr);
2028 return err;
2029 }
2030
2031 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2032 {
2033 int err = 0;
2034 struct ip_mreqn imr;
2035 __be32 addr = msf->imsf_multiaddr;
2036 struct ip_mc_socklist *pmc;
2037 struct in_device *in_dev;
2038 struct inet_sock *inet = inet_sk(sk);
2039 struct ip_sf_socklist *newpsl, *psl;
2040 struct net *net = sock_net(sk);
2041 int leavegroup = 0;
2042
2043 if (!ipv4_is_multicast(addr))
2044 return -EINVAL;
2045 if (msf->imsf_fmode != MCAST_INCLUDE &&
2046 msf->imsf_fmode != MCAST_EXCLUDE)
2047 return -EINVAL;
2048
2049 rtnl_lock();
2050
2051 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2052 imr.imr_address.s_addr = msf->imsf_interface;
2053 imr.imr_ifindex = ifindex;
2054 in_dev = ip_mc_find_dev(net, &imr);
2055
2056 if (!in_dev) {
2057 err = -ENODEV;
2058 goto done;
2059 }
2060
2061 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2062 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2063 leavegroup = 1;
2064 goto done;
2065 }
2066
2067 for_each_pmc_rtnl(inet, pmc) {
2068 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2069 pmc->multi.imr_ifindex == imr.imr_ifindex)
2070 break;
2071 }
2072 if (!pmc) { /* must have a prior join */
2073 err = -EINVAL;
2074 goto done;
2075 }
2076 if (msf->imsf_numsrc) {
2077 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2078 GFP_KERNEL);
2079 if (!newpsl) {
2080 err = -ENOBUFS;
2081 goto done;
2082 }
2083 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2084 memcpy(newpsl->sl_addr, msf->imsf_slist,
2085 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2086 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2087 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2088 if (err) {
2089 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2090 goto done;
2091 }
2092 } else {
2093 newpsl = NULL;
2094 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2095 msf->imsf_fmode, 0, NULL, 0);
2096 }
2097 psl = rtnl_dereference(pmc->sflist);
2098 if (psl) {
2099 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2100 psl->sl_count, psl->sl_addr, 0);
2101 /* decrease mem now to avoid the memleak warning */
2102 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2103 kfree_rcu(psl, rcu);
2104 } else
2105 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2106 0, NULL, 0);
2107 RCU_INIT_POINTER(pmc->sflist, newpsl);
2108 pmc->sfmode = msf->imsf_fmode;
2109 err = 0;
2110 done:
2111 rtnl_unlock();
2112 if (leavegroup)
2113 err = ip_mc_leave_group(sk, &imr);
2114 return err;
2115 }
2116
2117 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2118 struct ip_msfilter __user *optval, int __user *optlen)
2119 {
2120 int err, len, count, copycount;
2121 struct ip_mreqn imr;
2122 __be32 addr = msf->imsf_multiaddr;
2123 struct ip_mc_socklist *pmc;
2124 struct in_device *in_dev;
2125 struct inet_sock *inet = inet_sk(sk);
2126 struct ip_sf_socklist *psl;
2127 struct net *net = sock_net(sk);
2128
2129 if (!ipv4_is_multicast(addr))
2130 return -EINVAL;
2131
2132 rtnl_lock();
2133
2134 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2135 imr.imr_address.s_addr = msf->imsf_interface;
2136 imr.imr_ifindex = 0;
2137 in_dev = ip_mc_find_dev(net, &imr);
2138
2139 if (!in_dev) {
2140 err = -ENODEV;
2141 goto done;
2142 }
2143 err = -EADDRNOTAVAIL;
2144
2145 for_each_pmc_rtnl(inet, pmc) {
2146 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2147 pmc->multi.imr_ifindex == imr.imr_ifindex)
2148 break;
2149 }
2150 if (!pmc) /* must have a prior join */
2151 goto done;
2152 msf->imsf_fmode = pmc->sfmode;
2153 psl = rtnl_dereference(pmc->sflist);
2154 rtnl_unlock();
2155 if (!psl) {
2156 len = 0;
2157 count = 0;
2158 } else {
2159 count = psl->sl_count;
2160 }
2161 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2162 len = copycount * sizeof(psl->sl_addr[0]);
2163 msf->imsf_numsrc = count;
2164 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2165 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2166 return -EFAULT;
2167 }
2168 if (len &&
2169 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2170 return -EFAULT;
2171 return 0;
2172 done:
2173 rtnl_unlock();
2174 return err;
2175 }
2176
2177 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2178 struct group_filter __user *optval, int __user *optlen)
2179 {
2180 int err, i, count, copycount;
2181 struct sockaddr_in *psin;
2182 __be32 addr;
2183 struct ip_mc_socklist *pmc;
2184 struct inet_sock *inet = inet_sk(sk);
2185 struct ip_sf_socklist *psl;
2186
2187 psin = (struct sockaddr_in *)&gsf->gf_group;
2188 if (psin->sin_family != AF_INET)
2189 return -EINVAL;
2190 addr = psin->sin_addr.s_addr;
2191 if (!ipv4_is_multicast(addr))
2192 return -EINVAL;
2193
2194 rtnl_lock();
2195
2196 err = -EADDRNOTAVAIL;
2197
2198 for_each_pmc_rtnl(inet, pmc) {
2199 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2200 pmc->multi.imr_ifindex == gsf->gf_interface)
2201 break;
2202 }
2203 if (!pmc) /* must have a prior join */
2204 goto done;
2205 gsf->gf_fmode = pmc->sfmode;
2206 psl = rtnl_dereference(pmc->sflist);
2207 rtnl_unlock();
2208 count = psl ? psl->sl_count : 0;
2209 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2210 gsf->gf_numsrc = count;
2211 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2212 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2213 return -EFAULT;
2214 }
2215 for (i=0; i<copycount; i++) {
2216 struct sockaddr_storage ss;
2217
2218 psin = (struct sockaddr_in *)&ss;
2219 memset(&ss, 0, sizeof(ss));
2220 psin->sin_family = AF_INET;
2221 psin->sin_addr.s_addr = psl->sl_addr[i];
2222 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2223 return -EFAULT;
2224 }
2225 return 0;
2226 done:
2227 rtnl_unlock();
2228 return err;
2229 }
2230
2231 /*
2232 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2233 */
2234 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2235 {
2236 struct inet_sock *inet = inet_sk(sk);
2237 struct ip_mc_socklist *pmc;
2238 struct ip_sf_socklist *psl;
2239 int i;
2240 int ret;
2241
2242 ret = 1;
2243 if (!ipv4_is_multicast(loc_addr))
2244 goto out;
2245
2246 rcu_read_lock();
2247 for_each_pmc_rcu(inet, pmc) {
2248 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2249 pmc->multi.imr_ifindex == dif)
2250 break;
2251 }
2252 ret = inet->mc_all;
2253 if (!pmc)
2254 goto unlock;
2255 psl = rcu_dereference(pmc->sflist);
2256 ret = (pmc->sfmode == MCAST_EXCLUDE);
2257 if (!psl)
2258 goto unlock;
2259
2260 for (i=0; i<psl->sl_count; i++) {
2261 if (psl->sl_addr[i] == rmt_addr)
2262 break;
2263 }
2264 ret = 0;
2265 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2266 goto unlock;
2267 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2268 goto unlock;
2269 ret = 1;
2270 unlock:
2271 rcu_read_unlock();
2272 out:
2273 return ret;
2274 }
2275
2276 /*
2277 * A socket is closing.
2278 */
2279
2280 void ip_mc_drop_socket(struct sock *sk)
2281 {
2282 struct inet_sock *inet = inet_sk(sk);
2283 struct ip_mc_socklist *iml;
2284 struct net *net = sock_net(sk);
2285
2286 if (inet->mc_list == NULL)
2287 return;
2288
2289 rtnl_lock();
2290 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2291 struct in_device *in_dev;
2292
2293 inet->mc_list = iml->next_rcu;
2294 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2295 (void) ip_mc_leave_src(sk, iml, in_dev);
2296 if (in_dev != NULL)
2297 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2298 /* decrease mem now to avoid the memleak warning */
2299 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2300 kfree_rcu(iml, rcu);
2301 }
2302 rtnl_unlock();
2303 }
2304
2305 /* called with rcu_read_lock() */
2306 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2307 {
2308 struct ip_mc_list *im;
2309 struct ip_sf_list *psf;
2310 int rv = 0;
2311
2312 for_each_pmc_rcu(in_dev, im) {
2313 if (im->multiaddr == mc_addr)
2314 break;
2315 }
2316 if (im && proto == IPPROTO_IGMP) {
2317 rv = 1;
2318 } else if (im) {
2319 if (src_addr) {
2320 for (psf=im->sources; psf; psf=psf->sf_next) {
2321 if (psf->sf_inaddr == src_addr)
2322 break;
2323 }
2324 if (psf)
2325 rv = psf->sf_count[MCAST_INCLUDE] ||
2326 psf->sf_count[MCAST_EXCLUDE] !=
2327 im->sfcount[MCAST_EXCLUDE];
2328 else
2329 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2330 } else
2331 rv = 1; /* unspecified source; tentatively allow */
2332 }
2333 return rv;
2334 }
2335
2336 #if defined(CONFIG_PROC_FS)
2337 struct igmp_mc_iter_state {
2338 struct seq_net_private p;
2339 struct net_device *dev;
2340 struct in_device *in_dev;
2341 };
2342
2343 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2344
2345 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2346 {
2347 struct net *net = seq_file_net(seq);
2348 struct ip_mc_list *im = NULL;
2349 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2350
2351 state->in_dev = NULL;
2352 for_each_netdev_rcu(net, state->dev) {
2353 struct in_device *in_dev;
2354
2355 in_dev = __in_dev_get_rcu(state->dev);
2356 if (!in_dev)
2357 continue;
2358 im = rcu_dereference(in_dev->mc_list);
2359 if (im) {
2360 state->in_dev = in_dev;
2361 break;
2362 }
2363 }
2364 return im;
2365 }
2366
2367 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2368 {
2369 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2370
2371 im = rcu_dereference(im->next_rcu);
2372 while (!im) {
2373 state->dev = next_net_device_rcu(state->dev);
2374 if (!state->dev) {
2375 state->in_dev = NULL;
2376 break;
2377 }
2378 state->in_dev = __in_dev_get_rcu(state->dev);
2379 if (!state->in_dev)
2380 continue;
2381 im = rcu_dereference(state->in_dev->mc_list);
2382 }
2383 return im;
2384 }
2385
2386 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2387 {
2388 struct ip_mc_list *im = igmp_mc_get_first(seq);
2389 if (im)
2390 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2391 --pos;
2392 return pos ? NULL : im;
2393 }
2394
2395 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2396 __acquires(rcu)
2397 {
2398 rcu_read_lock();
2399 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2400 }
2401
2402 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2403 {
2404 struct ip_mc_list *im;
2405 if (v == SEQ_START_TOKEN)
2406 im = igmp_mc_get_first(seq);
2407 else
2408 im = igmp_mc_get_next(seq, v);
2409 ++*pos;
2410 return im;
2411 }
2412
2413 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2414 __releases(rcu)
2415 {
2416 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2417
2418 state->in_dev = NULL;
2419 state->dev = NULL;
2420 rcu_read_unlock();
2421 }
2422
2423 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2424 {
2425 if (v == SEQ_START_TOKEN)
2426 seq_puts(seq,
2427 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2428 else {
2429 struct ip_mc_list *im = (struct ip_mc_list *)v;
2430 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2431 char *querier;
2432 #ifdef CONFIG_IP_MULTICAST
2433 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2434 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2435 "V3";
2436 #else
2437 querier = "NONE";
2438 #endif
2439
2440 if (rcu_dereference(state->in_dev->mc_list) == im) {
2441 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2442 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2443 }
2444
2445 seq_printf(seq,
2446 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2447 im->multiaddr, im->users,
2448 im->tm_running, im->tm_running ?
2449 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2450 im->reporter);
2451 }
2452 return 0;
2453 }
2454
2455 static const struct seq_operations igmp_mc_seq_ops = {
2456 .start = igmp_mc_seq_start,
2457 .next = igmp_mc_seq_next,
2458 .stop = igmp_mc_seq_stop,
2459 .show = igmp_mc_seq_show,
2460 };
2461
2462 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2463 {
2464 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2465 sizeof(struct igmp_mc_iter_state));
2466 }
2467
2468 static const struct file_operations igmp_mc_seq_fops = {
2469 .owner = THIS_MODULE,
2470 .open = igmp_mc_seq_open,
2471 .read = seq_read,
2472 .llseek = seq_lseek,
2473 .release = seq_release_net,
2474 };
2475
2476 struct igmp_mcf_iter_state {
2477 struct seq_net_private p;
2478 struct net_device *dev;
2479 struct in_device *idev;
2480 struct ip_mc_list *im;
2481 };
2482
2483 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2484
2485 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2486 {
2487 struct net *net = seq_file_net(seq);
2488 struct ip_sf_list *psf = NULL;
2489 struct ip_mc_list *im = NULL;
2490 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2491
2492 state->idev = NULL;
2493 state->im = NULL;
2494 for_each_netdev_rcu(net, state->dev) {
2495 struct in_device *idev;
2496 idev = __in_dev_get_rcu(state->dev);
2497 if (unlikely(idev == NULL))
2498 continue;
2499 im = rcu_dereference(idev->mc_list);
2500 if (likely(im != NULL)) {
2501 spin_lock_bh(&im->lock);
2502 psf = im->sources;
2503 if (likely(psf != NULL)) {
2504 state->im = im;
2505 state->idev = idev;
2506 break;
2507 }
2508 spin_unlock_bh(&im->lock);
2509 }
2510 }
2511 return psf;
2512 }
2513
2514 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2515 {
2516 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2517
2518 psf = psf->sf_next;
2519 while (!psf) {
2520 spin_unlock_bh(&state->im->lock);
2521 state->im = state->im->next;
2522 while (!state->im) {
2523 state->dev = next_net_device_rcu(state->dev);
2524 if (!state->dev) {
2525 state->idev = NULL;
2526 goto out;
2527 }
2528 state->idev = __in_dev_get_rcu(state->dev);
2529 if (!state->idev)
2530 continue;
2531 state->im = rcu_dereference(state->idev->mc_list);
2532 }
2533 if (!state->im)
2534 break;
2535 spin_lock_bh(&state->im->lock);
2536 psf = state->im->sources;
2537 }
2538 out:
2539 return psf;
2540 }
2541
2542 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2543 {
2544 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2545 if (psf)
2546 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2547 --pos;
2548 return pos ? NULL : psf;
2549 }
2550
2551 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2552 __acquires(rcu)
2553 {
2554 rcu_read_lock();
2555 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2556 }
2557
2558 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2559 {
2560 struct ip_sf_list *psf;
2561 if (v == SEQ_START_TOKEN)
2562 psf = igmp_mcf_get_first(seq);
2563 else
2564 psf = igmp_mcf_get_next(seq, v);
2565 ++*pos;
2566 return psf;
2567 }
2568
2569 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2570 __releases(rcu)
2571 {
2572 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2573 if (likely(state->im != NULL)) {
2574 spin_unlock_bh(&state->im->lock);
2575 state->im = NULL;
2576 }
2577 state->idev = NULL;
2578 state->dev = NULL;
2579 rcu_read_unlock();
2580 }
2581
2582 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2583 {
2584 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2585 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2586
2587 if (v == SEQ_START_TOKEN) {
2588 seq_printf(seq,
2589 "%3s %6s "
2590 "%10s %10s %6s %6s\n", "Idx",
2591 "Device", "MCA",
2592 "SRC", "INC", "EXC");
2593 } else {
2594 seq_printf(seq,
2595 "%3d %6.6s 0x%08x "
2596 "0x%08x %6lu %6lu\n",
2597 state->dev->ifindex, state->dev->name,
2598 ntohl(state->im->multiaddr),
2599 ntohl(psf->sf_inaddr),
2600 psf->sf_count[MCAST_INCLUDE],
2601 psf->sf_count[MCAST_EXCLUDE]);
2602 }
2603 return 0;
2604 }
2605
2606 static const struct seq_operations igmp_mcf_seq_ops = {
2607 .start = igmp_mcf_seq_start,
2608 .next = igmp_mcf_seq_next,
2609 .stop = igmp_mcf_seq_stop,
2610 .show = igmp_mcf_seq_show,
2611 };
2612
2613 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2614 {
2615 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2616 sizeof(struct igmp_mcf_iter_state));
2617 }
2618
2619 static const struct file_operations igmp_mcf_seq_fops = {
2620 .owner = THIS_MODULE,
2621 .open = igmp_mcf_seq_open,
2622 .read = seq_read,
2623 .llseek = seq_lseek,
2624 .release = seq_release_net,
2625 };
2626
2627 static int __net_init igmp_net_init(struct net *net)
2628 {
2629 struct proc_dir_entry *pde;
2630
2631 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2632 if (!pde)
2633 goto out_igmp;
2634 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2635 if (!pde)
2636 goto out_mcfilter;
2637 return 0;
2638
2639 out_mcfilter:
2640 proc_net_remove(net, "igmp");
2641 out_igmp:
2642 return -ENOMEM;
2643 }
2644
2645 static void __net_exit igmp_net_exit(struct net *net)
2646 {
2647 proc_net_remove(net, "mcfilter");
2648 proc_net_remove(net, "igmp");
2649 }
2650
2651 static struct pernet_operations igmp_net_ops = {
2652 .init = igmp_net_init,
2653 .exit = igmp_net_exit,
2654 };
2655
2656 int __init igmp_mc_proc_init(void)
2657 {
2658 return register_pernet_subsys(&igmp_net_ops);
2659 }
2660 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree