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73#include <linux/module.h>
74#include <linux/slab.h>
75#include <asm/uaccess.h>
76#include <linux/types.h>
77#include <linux/kernel.h>
78#include <linux/jiffies.h>
79#include <linux/string.h>
80#include <linux/socket.h>
81#include <linux/sockios.h>
82#include <linux/in.h>
83#include <linux/inet.h>
84#include <linux/netdevice.h>
85#include <linux/skbuff.h>
86#include <linux/inetdevice.h>
87#include <linux/igmp.h>
88#include <linux/if_arp.h>
89#include <linux/rtnetlink.h>
90#include <linux/times.h>
91#include <linux/pkt_sched.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 <net/inet_common.h>
101#include <linux/netfilter_ipv4.h>
102#ifdef CONFIG_IP_MROUTE
103#include <linux/mroute.h>
104#endif
105#ifdef CONFIG_PROC_FS
106#include <linux/proc_fs.h>
107#include <linux/seq_file.h>
108#endif
109
110#define IP_MAX_MEMBERSHIPS 20
111#define IP_MAX_MSF 10
112
113#ifdef CONFIG_IP_MULTICAST
114
115
116#define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
117#define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
118#define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
119#define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
120#define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
121#define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
122
123
124#define IGMP_INITIAL_REPORT_DELAY (1)
125
126
127
128
129
130
131
132
133#define IGMP_V1_SEEN(in_dev) \
134 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
135 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
136 ((in_dev)->mr_v1_seen && \
137 time_before(jiffies, (in_dev)->mr_v1_seen)))
138#define IGMP_V2_SEEN(in_dev) \
139 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
140 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
141 ((in_dev)->mr_v2_seen && \
142 time_before(jiffies, (in_dev)->mr_v2_seen)))
143
144static int unsolicited_report_interval(struct in_device *in_dev)
145{
146 int interval_ms, interval_jiffies;
147
148 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
149 interval_ms = IN_DEV_CONF_GET(
150 in_dev,
151 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
152 else
153 interval_ms = IN_DEV_CONF_GET(
154 in_dev,
155 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
156
157 interval_jiffies = msecs_to_jiffies(interval_ms);
158
159
160
161
162 if (interval_jiffies <= 0)
163 interval_jiffies = 1;
164 return interval_jiffies;
165}
166
167static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
168static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
169static void igmpv3_clear_delrec(struct in_device *in_dev);
170static int sf_setstate(struct ip_mc_list *pmc);
171static void sf_markstate(struct ip_mc_list *pmc);
172#endif
173static void ip_mc_clear_src(struct ip_mc_list *pmc);
174static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
175 int sfcount, __be32 *psfsrc, int delta);
176
177static void ip_ma_put(struct ip_mc_list *im)
178{
179 if (atomic_dec_and_test(&im->refcnt)) {
180 in_dev_put(im->interface);
181 kfree_rcu(im, rcu);
182 }
183}
184
185#define for_each_pmc_rcu(in_dev, pmc) \
186 for (pmc = rcu_dereference(in_dev->mc_list); \
187 pmc != NULL; \
188 pmc = rcu_dereference(pmc->next_rcu))
189
190#define for_each_pmc_rtnl(in_dev, pmc) \
191 for (pmc = rtnl_dereference(in_dev->mc_list); \
192 pmc != NULL; \
193 pmc = rtnl_dereference(pmc->next_rcu))
194
195#ifdef CONFIG_IP_MULTICAST
196
197
198
199
200
201static void igmp_stop_timer(struct ip_mc_list *im)
202{
203 spin_lock_bh(&im->lock);
204 if (del_timer(&im->timer))
205 atomic_dec(&im->refcnt);
206 im->tm_running = 0;
207 im->reporter = 0;
208 im->unsolicit_count = 0;
209 spin_unlock_bh(&im->lock);
210}
211
212
213static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
214{
215 int tv = prandom_u32() % max_delay;
216
217 im->tm_running = 1;
218 if (!mod_timer(&im->timer, jiffies+tv+2))
219 atomic_inc(&im->refcnt);
220}
221
222static void igmp_gq_start_timer(struct in_device *in_dev)
223{
224 int tv = prandom_u32() % in_dev->mr_maxdelay;
225
226 in_dev->mr_gq_running = 1;
227 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
228 in_dev_hold(in_dev);
229}
230
231static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
232{
233 int tv = prandom_u32() % delay;
234
235 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
236 in_dev_hold(in_dev);
237}
238
239static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
240{
241 spin_lock_bh(&im->lock);
242 im->unsolicit_count = 0;
243 if (del_timer(&im->timer)) {
244 if ((long)(im->timer.expires-jiffies) < max_delay) {
245 add_timer(&im->timer);
246 im->tm_running = 1;
247 spin_unlock_bh(&im->lock);
248 return;
249 }
250 atomic_dec(&im->refcnt);
251 }
252 igmp_start_timer(im, max_delay);
253 spin_unlock_bh(&im->lock);
254}
255
256
257
258
259
260
261#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
262
263
264static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
265 int gdeleted, int sdeleted)
266{
267 switch (type) {
268 case IGMPV3_MODE_IS_INCLUDE:
269 case IGMPV3_MODE_IS_EXCLUDE:
270 if (gdeleted || sdeleted)
271 return 0;
272 if (!(pmc->gsquery && !psf->sf_gsresp)) {
273 if (pmc->sfmode == MCAST_INCLUDE)
274 return 1;
275
276
277
278 if (psf->sf_count[MCAST_INCLUDE])
279 return type == IGMPV3_MODE_IS_INCLUDE;
280 return pmc->sfcount[MCAST_EXCLUDE] ==
281 psf->sf_count[MCAST_EXCLUDE];
282 }
283 return 0;
284 case IGMPV3_CHANGE_TO_INCLUDE:
285 if (gdeleted || sdeleted)
286 return 0;
287 return psf->sf_count[MCAST_INCLUDE] != 0;
288 case IGMPV3_CHANGE_TO_EXCLUDE:
289 if (gdeleted || sdeleted)
290 return 0;
291 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
292 psf->sf_count[MCAST_INCLUDE])
293 return 0;
294 return pmc->sfcount[MCAST_EXCLUDE] ==
295 psf->sf_count[MCAST_EXCLUDE];
296 case IGMPV3_ALLOW_NEW_SOURCES:
297 if (gdeleted || !psf->sf_crcount)
298 return 0;
299 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
300 case IGMPV3_BLOCK_OLD_SOURCES:
301 if (pmc->sfmode == MCAST_INCLUDE)
302 return gdeleted || (psf->sf_crcount && sdeleted);
303 return psf->sf_crcount && !gdeleted && !sdeleted;
304 }
305 return 0;
306}
307
308static int
309igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
310{
311 struct ip_sf_list *psf;
312 int scount = 0;
313
314 for (psf = pmc->sources; psf; psf = psf->sf_next) {
315 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
316 continue;
317 scount++;
318 }
319 return scount;
320}
321
322static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
323{
324 struct sk_buff *skb;
325 struct rtable *rt;
326 struct iphdr *pip;
327 struct igmpv3_report *pig;
328 struct net *net = dev_net(dev);
329 struct flowi4 fl4;
330 int hlen = LL_RESERVED_SPACE(dev);
331 int tlen = dev->needed_tailroom;
332 unsigned int size = mtu;
333
334 while (1) {
335 skb = alloc_skb(size + hlen + tlen,
336 GFP_ATOMIC | __GFP_NOWARN);
337 if (skb)
338 break;
339 size >>= 1;
340 if (size < 256)
341 return NULL;
342 }
343 skb->priority = TC_PRIO_CONTROL;
344
345 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
346 0, 0,
347 IPPROTO_IGMP, 0, dev->ifindex);
348 if (IS_ERR(rt)) {
349 kfree_skb(skb);
350 return NULL;
351 }
352
353 skb_dst_set(skb, &rt->dst);
354 skb->dev = dev;
355
356 skb->reserved_tailroom = skb_end_offset(skb) -
357 min(mtu, skb_end_offset(skb));
358 skb_reserve(skb, hlen);
359
360 skb_reset_network_header(skb);
361 pip = ip_hdr(skb);
362 skb_put(skb, sizeof(struct iphdr) + 4);
363
364 pip->version = 4;
365 pip->ihl = (sizeof(struct iphdr)+4)>>2;
366 pip->tos = 0xc0;
367 pip->frag_off = htons(IP_DF);
368 pip->ttl = 1;
369 pip->daddr = fl4.daddr;
370 pip->saddr = fl4.saddr;
371 pip->protocol = IPPROTO_IGMP;
372 pip->tot_len = 0;
373 ip_select_ident(net, skb, NULL);
374 ((u8 *)&pip[1])[0] = IPOPT_RA;
375 ((u8 *)&pip[1])[1] = 4;
376 ((u8 *)&pip[1])[2] = 0;
377 ((u8 *)&pip[1])[3] = 0;
378
379 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
380 skb_put(skb, sizeof(*pig));
381 pig = igmpv3_report_hdr(skb);
382 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
383 pig->resv1 = 0;
384 pig->csum = 0;
385 pig->resv2 = 0;
386 pig->ngrec = 0;
387 return skb;
388}
389
390static int igmpv3_sendpack(struct sk_buff *skb)
391{
392 struct igmphdr *pig = igmp_hdr(skb);
393 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
394
395 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
396
397 return ip_local_out(skb);
398}
399
400static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
401{
402 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
403}
404
405static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
406 int type, struct igmpv3_grec **ppgr)
407{
408 struct net_device *dev = pmc->interface->dev;
409 struct igmpv3_report *pih;
410 struct igmpv3_grec *pgr;
411
412 if (!skb)
413 skb = igmpv3_newpack(dev, dev->mtu);
414 if (!skb)
415 return NULL;
416 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
417 pgr->grec_type = type;
418 pgr->grec_auxwords = 0;
419 pgr->grec_nsrcs = 0;
420 pgr->grec_mca = pmc->multiaddr;
421 pih = igmpv3_report_hdr(skb);
422 pih->ngrec = htons(ntohs(pih->ngrec)+1);
423 *ppgr = pgr;
424 return skb;
425}
426
427#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
428
429static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
430 int type, int gdeleted, int sdeleted)
431{
432 struct net_device *dev = pmc->interface->dev;
433 struct igmpv3_report *pih;
434 struct igmpv3_grec *pgr = NULL;
435 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
436 int scount, stotal, first, isquery, truncate;
437
438 if (pmc->multiaddr == IGMP_ALL_HOSTS)
439 return skb;
440
441 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
442 type == IGMPV3_MODE_IS_EXCLUDE;
443 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
444 type == IGMPV3_CHANGE_TO_EXCLUDE;
445
446 stotal = scount = 0;
447
448 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
449
450 if (!*psf_list)
451 goto empty_source;
452
453 pih = skb ? igmpv3_report_hdr(skb) : NULL;
454
455
456 if (truncate) {
457 if (pih && pih->ngrec &&
458 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
459 if (skb)
460 igmpv3_sendpack(skb);
461 skb = igmpv3_newpack(dev, dev->mtu);
462 }
463 }
464 first = 1;
465 psf_prev = NULL;
466 for (psf = *psf_list; psf; psf = psf_next) {
467 __be32 *psrc;
468
469 psf_next = psf->sf_next;
470
471 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
472 psf_prev = psf;
473 continue;
474 }
475
476
477 if (isquery)
478 psf->sf_gsresp = 0;
479
480 if (AVAILABLE(skb) < sizeof(__be32) +
481 first*sizeof(struct igmpv3_grec)) {
482 if (truncate && !first)
483 break;
484 if (pgr)
485 pgr->grec_nsrcs = htons(scount);
486 if (skb)
487 igmpv3_sendpack(skb);
488 skb = igmpv3_newpack(dev, dev->mtu);
489 first = 1;
490 scount = 0;
491 }
492 if (first) {
493 skb = add_grhead(skb, pmc, type, &pgr);
494 first = 0;
495 }
496 if (!skb)
497 return NULL;
498 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
499 *psrc = psf->sf_inaddr;
500 scount++; stotal++;
501 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
502 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
503 psf->sf_crcount--;
504 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
505 if (psf_prev)
506 psf_prev->sf_next = psf->sf_next;
507 else
508 *psf_list = psf->sf_next;
509 kfree(psf);
510 continue;
511 }
512 }
513 psf_prev = psf;
514 }
515
516empty_source:
517 if (!stotal) {
518 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
519 type == IGMPV3_BLOCK_OLD_SOURCES)
520 return skb;
521 if (pmc->crcount || isquery) {
522
523 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
524 igmpv3_sendpack(skb);
525 skb = NULL;
526 }
527 skb = add_grhead(skb, pmc, type, &pgr);
528 }
529 }
530 if (pgr)
531 pgr->grec_nsrcs = htons(scount);
532
533 if (isquery)
534 pmc->gsquery = 0;
535 return skb;
536}
537
538static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
539{
540 struct sk_buff *skb = NULL;
541 int type;
542
543 if (!pmc) {
544 rcu_read_lock();
545 for_each_pmc_rcu(in_dev, pmc) {
546 if (pmc->multiaddr == IGMP_ALL_HOSTS)
547 continue;
548 spin_lock_bh(&pmc->lock);
549 if (pmc->sfcount[MCAST_EXCLUDE])
550 type = IGMPV3_MODE_IS_EXCLUDE;
551 else
552 type = IGMPV3_MODE_IS_INCLUDE;
553 skb = add_grec(skb, pmc, type, 0, 0);
554 spin_unlock_bh(&pmc->lock);
555 }
556 rcu_read_unlock();
557 } else {
558 spin_lock_bh(&pmc->lock);
559 if (pmc->sfcount[MCAST_EXCLUDE])
560 type = IGMPV3_MODE_IS_EXCLUDE;
561 else
562 type = IGMPV3_MODE_IS_INCLUDE;
563 skb = add_grec(skb, pmc, type, 0, 0);
564 spin_unlock_bh(&pmc->lock);
565 }
566 if (!skb)
567 return 0;
568 return igmpv3_sendpack(skb);
569}
570
571
572
573
574static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
575{
576 struct ip_sf_list *psf_prev, *psf_next, *psf;
577
578 psf_prev = NULL;
579 for (psf = *ppsf; psf; psf = psf_next) {
580 psf_next = psf->sf_next;
581 if (psf->sf_crcount == 0) {
582 if (psf_prev)
583 psf_prev->sf_next = psf->sf_next;
584 else
585 *ppsf = psf->sf_next;
586 kfree(psf);
587 } else
588 psf_prev = psf;
589 }
590}
591
592static void igmpv3_send_cr(struct in_device *in_dev)
593{
594 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
595 struct sk_buff *skb = NULL;
596 int type, dtype;
597
598 rcu_read_lock();
599 spin_lock_bh(&in_dev->mc_tomb_lock);
600
601
602 pmc_prev = NULL;
603 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
604 pmc_next = pmc->next;
605 if (pmc->sfmode == MCAST_INCLUDE) {
606 type = IGMPV3_BLOCK_OLD_SOURCES;
607 dtype = IGMPV3_BLOCK_OLD_SOURCES;
608 skb = add_grec(skb, pmc, type, 1, 0);
609 skb = add_grec(skb, pmc, dtype, 1, 1);
610 }
611 if (pmc->crcount) {
612 if (pmc->sfmode == MCAST_EXCLUDE) {
613 type = IGMPV3_CHANGE_TO_INCLUDE;
614 skb = add_grec(skb, pmc, type, 1, 0);
615 }
616 pmc->crcount--;
617 if (pmc->crcount == 0) {
618 igmpv3_clear_zeros(&pmc->tomb);
619 igmpv3_clear_zeros(&pmc->sources);
620 }
621 }
622 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
623 if (pmc_prev)
624 pmc_prev->next = pmc_next;
625 else
626 in_dev->mc_tomb = pmc_next;
627 in_dev_put(pmc->interface);
628 kfree(pmc);
629 } else
630 pmc_prev = pmc;
631 }
632 spin_unlock_bh(&in_dev->mc_tomb_lock);
633
634
635 for_each_pmc_rcu(in_dev, pmc) {
636 spin_lock_bh(&pmc->lock);
637 if (pmc->sfcount[MCAST_EXCLUDE]) {
638 type = IGMPV3_BLOCK_OLD_SOURCES;
639 dtype = IGMPV3_ALLOW_NEW_SOURCES;
640 } else {
641 type = IGMPV3_ALLOW_NEW_SOURCES;
642 dtype = IGMPV3_BLOCK_OLD_SOURCES;
643 }
644 skb = add_grec(skb, pmc, type, 0, 0);
645 skb = add_grec(skb, pmc, dtype, 0, 1);
646
647
648 if (pmc->crcount) {
649 if (pmc->sfmode == MCAST_EXCLUDE)
650 type = IGMPV3_CHANGE_TO_EXCLUDE;
651 else
652 type = IGMPV3_CHANGE_TO_INCLUDE;
653 skb = add_grec(skb, pmc, type, 0, 0);
654 pmc->crcount--;
655 }
656 spin_unlock_bh(&pmc->lock);
657 }
658 rcu_read_unlock();
659
660 if (!skb)
661 return;
662 (void) igmpv3_sendpack(skb);
663}
664
665static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
666 int type)
667{
668 struct sk_buff *skb;
669 struct iphdr *iph;
670 struct igmphdr *ih;
671 struct rtable *rt;
672 struct net_device *dev = in_dev->dev;
673 struct net *net = dev_net(dev);
674 __be32 group = pmc ? pmc->multiaddr : 0;
675 struct flowi4 fl4;
676 __be32 dst;
677 int hlen, tlen;
678
679 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
680 return igmpv3_send_report(in_dev, pmc);
681 else if (type == IGMP_HOST_LEAVE_MESSAGE)
682 dst = IGMP_ALL_ROUTER;
683 else
684 dst = group;
685
686 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
687 0, 0,
688 IPPROTO_IGMP, 0, dev->ifindex);
689 if (IS_ERR(rt))
690 return -1;
691
692 hlen = LL_RESERVED_SPACE(dev);
693 tlen = dev->needed_tailroom;
694 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
695 if (!skb) {
696 ip_rt_put(rt);
697 return -1;
698 }
699 skb->priority = TC_PRIO_CONTROL;
700
701 skb_dst_set(skb, &rt->dst);
702
703 skb_reserve(skb, hlen);
704
705 skb_reset_network_header(skb);
706 iph = ip_hdr(skb);
707 skb_put(skb, sizeof(struct iphdr) + 4);
708
709 iph->version = 4;
710 iph->ihl = (sizeof(struct iphdr)+4)>>2;
711 iph->tos = 0xc0;
712 iph->frag_off = htons(IP_DF);
713 iph->ttl = 1;
714 iph->daddr = dst;
715 iph->saddr = fl4.saddr;
716 iph->protocol = IPPROTO_IGMP;
717 ip_select_ident(net, skb, NULL);
718 ((u8 *)&iph[1])[0] = IPOPT_RA;
719 ((u8 *)&iph[1])[1] = 4;
720 ((u8 *)&iph[1])[2] = 0;
721 ((u8 *)&iph[1])[3] = 0;
722
723 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
724 ih->type = type;
725 ih->code = 0;
726 ih->csum = 0;
727 ih->group = group;
728 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
729
730 return ip_local_out(skb);
731}
732
733static void igmp_gq_timer_expire(unsigned long data)
734{
735 struct in_device *in_dev = (struct in_device *)data;
736
737 in_dev->mr_gq_running = 0;
738 igmpv3_send_report(in_dev, NULL);
739 in_dev_put(in_dev);
740}
741
742static void igmp_ifc_timer_expire(unsigned long data)
743{
744 struct in_device *in_dev = (struct in_device *)data;
745
746 igmpv3_send_cr(in_dev);
747 if (in_dev->mr_ifc_count) {
748 in_dev->mr_ifc_count--;
749 igmp_ifc_start_timer(in_dev,
750 unsolicited_report_interval(in_dev));
751 }
752 in_dev_put(in_dev);
753}
754
755static void igmp_ifc_event(struct in_device *in_dev)
756{
757 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
758 return;
759 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
760 igmp_ifc_start_timer(in_dev, 1);
761}
762
763
764static void igmp_timer_expire(unsigned long data)
765{
766 struct ip_mc_list *im = (struct ip_mc_list *)data;
767 struct in_device *in_dev = im->interface;
768
769 spin_lock(&im->lock);
770 im->tm_running = 0;
771
772 if (im->unsolicit_count) {
773 im->unsolicit_count--;
774 igmp_start_timer(im, unsolicited_report_interval(in_dev));
775 }
776 im->reporter = 1;
777 spin_unlock(&im->lock);
778
779 if (IGMP_V1_SEEN(in_dev))
780 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
781 else if (IGMP_V2_SEEN(in_dev))
782 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
783 else
784 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
785
786 ip_ma_put(im);
787}
788
789
790static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
791{
792 struct ip_sf_list *psf;
793 int i, scount;
794
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
801 if (psf->sf_count[MCAST_INCLUDE] ||
802 pmc->sfcount[MCAST_EXCLUDE] !=
803 psf->sf_count[MCAST_EXCLUDE])
804 break;
805 if (srcs[i] == psf->sf_inaddr) {
806 scount++;
807 break;
808 }
809 }
810 }
811 pmc->gsquery = 0;
812 if (scount == nsrcs)
813 return 0;
814 return 1;
815}
816
817static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
818{
819 struct ip_sf_list *psf;
820 int i, scount;
821
822 if (pmc->sfmode == MCAST_EXCLUDE)
823 return igmp_xmarksources(pmc, nsrcs, srcs);
824
825
826 scount = 0;
827 for (psf = pmc->sources; psf; psf = psf->sf_next) {
828 if (scount == nsrcs)
829 break;
830 for (i = 0; i < nsrcs; i++)
831 if (srcs[i] == psf->sf_inaddr) {
832 psf->sf_gsresp = 1;
833 scount++;
834 break;
835 }
836 }
837 if (!scount) {
838 pmc->gsquery = 0;
839 return 0;
840 }
841 pmc->gsquery = 1;
842 return 1;
843}
844
845
846static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
847{
848 struct ip_mc_list *im;
849
850
851
852 if (group == IGMP_ALL_HOSTS)
853 return false;
854
855 rcu_read_lock();
856 for_each_pmc_rcu(in_dev, im) {
857 if (im->multiaddr == group) {
858 igmp_stop_timer(im);
859 break;
860 }
861 }
862 rcu_read_unlock();
863 return false;
864}
865
866
867static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
868 int len)
869{
870 struct igmphdr *ih = igmp_hdr(skb);
871 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
872 struct ip_mc_list *im;
873 __be32 group = ih->group;
874 int max_delay;
875 int mark = 0;
876
877
878 if (len == 8) {
879 if (ih->code == 0) {
880
881
882 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
883 in_dev->mr_v1_seen = jiffies +
884 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
885 group = 0;
886 } else {
887
888 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
889 in_dev->mr_v2_seen = jiffies +
890 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
891 }
892
893 in_dev->mr_ifc_count = 0;
894 if (del_timer(&in_dev->mr_ifc_timer))
895 __in_dev_put(in_dev);
896
897 igmpv3_clear_delrec(in_dev);
898 } else if (len < 12) {
899 return true;
900 } else if (IGMP_V1_SEEN(in_dev)) {
901
902 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
903 group = 0;
904 } else if (IGMP_V2_SEEN(in_dev)) {
905
906
907
908
909
910
911 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
912 if (!max_delay)
913 max_delay = 1;
914 } else {
915 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
916 return true;
917
918 ih3 = igmpv3_query_hdr(skb);
919 if (ih3->nsrcs) {
920 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
921 + ntohs(ih3->nsrcs)*sizeof(__be32)))
922 return true;
923 ih3 = igmpv3_query_hdr(skb);
924 }
925
926 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
927 if (!max_delay)
928 max_delay = 1;
929 in_dev->mr_maxdelay = max_delay;
930 if (ih3->qrv)
931 in_dev->mr_qrv = ih3->qrv;
932 if (!group) {
933 if (ih3->nsrcs)
934 return true;
935 igmp_gq_start_timer(in_dev);
936 return false;
937 }
938
939 mark = ih3->nsrcs != 0;
940 }
941
942
943
944
945
946
947
948
949
950
951
952 rcu_read_lock();
953 for_each_pmc_rcu(in_dev, im) {
954 int changed;
955
956 if (group && group != im->multiaddr)
957 continue;
958 if (im->multiaddr == IGMP_ALL_HOSTS)
959 continue;
960 spin_lock_bh(&im->lock);
961 if (im->tm_running)
962 im->gsquery = im->gsquery && mark;
963 else
964 im->gsquery = mark;
965 changed = !im->gsquery ||
966 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
967 spin_unlock_bh(&im->lock);
968 if (changed)
969 igmp_mod_timer(im, max_delay);
970 }
971 rcu_read_unlock();
972 return false;
973}
974
975
976int igmp_rcv(struct sk_buff *skb)
977{
978
979 struct igmphdr *ih;
980 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
981 int len = skb->len;
982 bool dropped = true;
983
984 if (!in_dev)
985 goto drop;
986
987 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
988 goto drop;
989
990 if (skb_checksum_simple_validate(skb))
991 goto drop;
992
993 ih = igmp_hdr(skb);
994 switch (ih->type) {
995 case IGMP_HOST_MEMBERSHIP_QUERY:
996 dropped = igmp_heard_query(in_dev, skb, len);
997 break;
998 case IGMP_HOST_MEMBERSHIP_REPORT:
999 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1000
1001 if (rt_is_output_route(skb_rtable(skb)))
1002 break;
1003
1004 if (skb->pkt_type == PACKET_MULTICAST ||
1005 skb->pkt_type == PACKET_BROADCAST)
1006 dropped = igmp_heard_report(in_dev, ih->group);
1007 break;
1008 case IGMP_PIM:
1009#ifdef CONFIG_IP_PIMSM_V1
1010 return pim_rcv_v1(skb);
1011#endif
1012 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1013 case IGMP_DVMRP:
1014 case IGMP_TRACE:
1015 case IGMP_HOST_LEAVE_MESSAGE:
1016 case IGMP_MTRACE:
1017 case IGMP_MTRACE_RESP:
1018 break;
1019 default:
1020 break;
1021 }
1022
1023drop:
1024 if (dropped)
1025 kfree_skb(skb);
1026 else
1027 consume_skb(skb);
1028 return 0;
1029}
1030
1031#endif
1032
1033
1034
1035
1036
1037
1038static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1039{
1040 char buf[MAX_ADDR_LEN];
1041 struct net_device *dev = in_dev->dev;
1042
1043
1044
1045
1046
1047
1048
1049
1050 if (arp_mc_map(addr, buf, dev, 0) == 0)
1051 dev_mc_add(dev, buf);
1052}
1053
1054
1055
1056
1057
1058static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1059{
1060 char buf[MAX_ADDR_LEN];
1061 struct net_device *dev = in_dev->dev;
1062
1063 if (arp_mc_map(addr, buf, dev, 0) == 0)
1064 dev_mc_del(dev, buf);
1065}
1066
1067#ifdef CONFIG_IP_MULTICAST
1068
1069
1070
1071static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1072{
1073 struct ip_mc_list *pmc;
1074
1075
1076
1077
1078
1079
1080
1081 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1082 if (!pmc)
1083 return;
1084 spin_lock_bh(&im->lock);
1085 pmc->interface = im->interface;
1086 in_dev_hold(in_dev);
1087 pmc->multiaddr = im->multiaddr;
1088 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1089 pmc->sfmode = im->sfmode;
1090 if (pmc->sfmode == MCAST_INCLUDE) {
1091 struct ip_sf_list *psf;
1092
1093 pmc->tomb = im->tomb;
1094 pmc->sources = im->sources;
1095 im->tomb = im->sources = NULL;
1096 for (psf = pmc->sources; psf; psf = psf->sf_next)
1097 psf->sf_crcount = pmc->crcount;
1098 }
1099 spin_unlock_bh(&im->lock);
1100
1101 spin_lock_bh(&in_dev->mc_tomb_lock);
1102 pmc->next = in_dev->mc_tomb;
1103 in_dev->mc_tomb = pmc;
1104 spin_unlock_bh(&in_dev->mc_tomb_lock);
1105}
1106
1107static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1108{
1109 struct ip_mc_list *pmc, *pmc_prev;
1110 struct ip_sf_list *psf, *psf_next;
1111
1112 spin_lock_bh(&in_dev->mc_tomb_lock);
1113 pmc_prev = NULL;
1114 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1115 if (pmc->multiaddr == multiaddr)
1116 break;
1117 pmc_prev = pmc;
1118 }
1119 if (pmc) {
1120 if (pmc_prev)
1121 pmc_prev->next = pmc->next;
1122 else
1123 in_dev->mc_tomb = pmc->next;
1124 }
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1126 if (pmc) {
1127 for (psf = pmc->tomb; psf; psf = psf_next) {
1128 psf_next = psf->sf_next;
1129 kfree(psf);
1130 }
1131 in_dev_put(pmc->interface);
1132 kfree(pmc);
1133 }
1134}
1135
1136static void igmpv3_clear_delrec(struct in_device *in_dev)
1137{
1138 struct ip_mc_list *pmc, *nextpmc;
1139
1140 spin_lock_bh(&in_dev->mc_tomb_lock);
1141 pmc = in_dev->mc_tomb;
1142 in_dev->mc_tomb = NULL;
1143 spin_unlock_bh(&in_dev->mc_tomb_lock);
1144
1145 for (; pmc; pmc = nextpmc) {
1146 nextpmc = pmc->next;
1147 ip_mc_clear_src(pmc);
1148 in_dev_put(pmc->interface);
1149 kfree(pmc);
1150 }
1151
1152 rcu_read_lock();
1153 for_each_pmc_rcu(in_dev, pmc) {
1154 struct ip_sf_list *psf, *psf_next;
1155
1156 spin_lock_bh(&pmc->lock);
1157 psf = pmc->tomb;
1158 pmc->tomb = NULL;
1159 spin_unlock_bh(&pmc->lock);
1160 for (; psf; psf = psf_next) {
1161 psf_next = psf->sf_next;
1162 kfree(psf);
1163 }
1164 }
1165 rcu_read_unlock();
1166}
1167#endif
1168
1169static void igmp_group_dropped(struct ip_mc_list *im)
1170{
1171 struct in_device *in_dev = im->interface;
1172#ifdef CONFIG_IP_MULTICAST
1173 int reporter;
1174#endif
1175
1176 if (im->loaded) {
1177 im->loaded = 0;
1178 ip_mc_filter_del(in_dev, im->multiaddr);
1179 }
1180
1181#ifdef CONFIG_IP_MULTICAST
1182 if (im->multiaddr == IGMP_ALL_HOSTS)
1183 return;
1184
1185 reporter = im->reporter;
1186 igmp_stop_timer(im);
1187
1188 if (!in_dev->dead) {
1189 if (IGMP_V1_SEEN(in_dev))
1190 return;
1191 if (IGMP_V2_SEEN(in_dev)) {
1192 if (reporter)
1193 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1194 return;
1195 }
1196
1197 igmpv3_add_delrec(in_dev, im);
1198
1199 igmp_ifc_event(in_dev);
1200 }
1201#endif
1202}
1203
1204static void igmp_group_added(struct ip_mc_list *im)
1205{
1206 struct in_device *in_dev = im->interface;
1207
1208 if (im->loaded == 0) {
1209 im->loaded = 1;
1210 ip_mc_filter_add(in_dev, im->multiaddr);
1211 }
1212
1213#ifdef CONFIG_IP_MULTICAST
1214 if (im->multiaddr == IGMP_ALL_HOSTS)
1215 return;
1216
1217 if (in_dev->dead)
1218 return;
1219 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1220 spin_lock_bh(&im->lock);
1221 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1222 spin_unlock_bh(&im->lock);
1223 return;
1224 }
1225
1226
1227 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1228 igmp_ifc_event(in_dev);
1229#endif
1230}
1231
1232
1233
1234
1235
1236
1237static u32 ip_mc_hash(const struct ip_mc_list *im)
1238{
1239 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1240}
1241
1242static void ip_mc_hash_add(struct in_device *in_dev,
1243 struct ip_mc_list *im)
1244{
1245 struct ip_mc_list __rcu **mc_hash;
1246 u32 hash;
1247
1248 mc_hash = rtnl_dereference(in_dev->mc_hash);
1249 if (mc_hash) {
1250 hash = ip_mc_hash(im);
1251 im->next_hash = mc_hash[hash];
1252 rcu_assign_pointer(mc_hash[hash], im);
1253 return;
1254 }
1255
1256
1257 if (in_dev->mc_count < 4)
1258 return;
1259
1260 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1261 GFP_KERNEL);
1262 if (!mc_hash)
1263 return;
1264
1265 for_each_pmc_rtnl(in_dev, im) {
1266 hash = ip_mc_hash(im);
1267 im->next_hash = mc_hash[hash];
1268 RCU_INIT_POINTER(mc_hash[hash], im);
1269 }
1270
1271 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1272}
1273
1274static void ip_mc_hash_remove(struct in_device *in_dev,
1275 struct ip_mc_list *im)
1276{
1277 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1278 struct ip_mc_list *aux;
1279
1280 if (!mc_hash)
1281 return;
1282 mc_hash += ip_mc_hash(im);
1283 while ((aux = rtnl_dereference(*mc_hash)) != im)
1284 mc_hash = &aux->next_hash;
1285 *mc_hash = im->next_hash;
1286}
1287
1288
1289
1290
1291
1292
1293void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1294{
1295 struct ip_mc_list *im;
1296
1297 ASSERT_RTNL();
1298
1299 for_each_pmc_rtnl(in_dev, im) {
1300 if (im->multiaddr == addr) {
1301 im->users++;
1302 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1303 goto out;
1304 }
1305 }
1306
1307 im = kzalloc(sizeof(*im), GFP_KERNEL);
1308 if (!im)
1309 goto out;
1310
1311 im->users = 1;
1312 im->interface = in_dev;
1313 in_dev_hold(in_dev);
1314 im->multiaddr = addr;
1315
1316 im->sfmode = MCAST_EXCLUDE;
1317 im->sfcount[MCAST_EXCLUDE] = 1;
1318 atomic_set(&im->refcnt, 1);
1319 spin_lock_init(&im->lock);
1320#ifdef CONFIG_IP_MULTICAST
1321 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1322 im->unsolicit_count = sysctl_igmp_qrv;
1323#endif
1324
1325 im->next_rcu = in_dev->mc_list;
1326 in_dev->mc_count++;
1327 rcu_assign_pointer(in_dev->mc_list, im);
1328
1329 ip_mc_hash_add(in_dev, im);
1330
1331#ifdef CONFIG_IP_MULTICAST
1332 igmpv3_del_delrec(in_dev, im->multiaddr);
1333#endif
1334 igmp_group_added(im);
1335 if (!in_dev->dead)
1336 ip_rt_multicast_event(in_dev);
1337out:
1338 return;
1339}
1340EXPORT_SYMBOL(ip_mc_inc_group);
1341
1342
1343
1344
1345static void ip_mc_rejoin_groups(struct in_device *in_dev)
1346{
1347#ifdef CONFIG_IP_MULTICAST
1348 struct ip_mc_list *im;
1349 int type;
1350
1351 ASSERT_RTNL();
1352
1353 for_each_pmc_rtnl(in_dev, im) {
1354 if (im->multiaddr == IGMP_ALL_HOSTS)
1355 continue;
1356
1357
1358
1359
1360 if (IGMP_V1_SEEN(in_dev))
1361 type = IGMP_HOST_MEMBERSHIP_REPORT;
1362 else if (IGMP_V2_SEEN(in_dev))
1363 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1364 else
1365 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1366 igmp_send_report(in_dev, im, type);
1367 }
1368#endif
1369}
1370
1371
1372
1373
1374
1375void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1376{
1377 struct ip_mc_list *i;
1378 struct ip_mc_list __rcu **ip;
1379
1380 ASSERT_RTNL();
1381
1382 for (ip = &in_dev->mc_list;
1383 (i = rtnl_dereference(*ip)) != NULL;
1384 ip = &i->next_rcu) {
1385 if (i->multiaddr == addr) {
1386 if (--i->users == 0) {
1387 ip_mc_hash_remove(in_dev, i);
1388 *ip = i->next_rcu;
1389 in_dev->mc_count--;
1390 igmp_group_dropped(i);
1391 ip_mc_clear_src(i);
1392
1393 if (!in_dev->dead)
1394 ip_rt_multicast_event(in_dev);
1395
1396 ip_ma_put(i);
1397 return;
1398 }
1399 break;
1400 }
1401 }
1402}
1403EXPORT_SYMBOL(ip_mc_dec_group);
1404
1405
1406
1407void ip_mc_unmap(struct in_device *in_dev)
1408{
1409 struct ip_mc_list *pmc;
1410
1411 ASSERT_RTNL();
1412
1413 for_each_pmc_rtnl(in_dev, pmc)
1414 igmp_group_dropped(pmc);
1415}
1416
1417void ip_mc_remap(struct in_device *in_dev)
1418{
1419 struct ip_mc_list *pmc;
1420
1421 ASSERT_RTNL();
1422
1423 for_each_pmc_rtnl(in_dev, pmc)
1424 igmp_group_added(pmc);
1425}
1426
1427
1428
1429void ip_mc_down(struct in_device *in_dev)
1430{
1431 struct ip_mc_list *pmc;
1432
1433 ASSERT_RTNL();
1434
1435 for_each_pmc_rtnl(in_dev, pmc)
1436 igmp_group_dropped(pmc);
1437
1438#ifdef CONFIG_IP_MULTICAST
1439 in_dev->mr_ifc_count = 0;
1440 if (del_timer(&in_dev->mr_ifc_timer))
1441 __in_dev_put(in_dev);
1442 in_dev->mr_gq_running = 0;
1443 if (del_timer(&in_dev->mr_gq_timer))
1444 __in_dev_put(in_dev);
1445 igmpv3_clear_delrec(in_dev);
1446#endif
1447
1448 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1449}
1450
1451void ip_mc_init_dev(struct in_device *in_dev)
1452{
1453 ASSERT_RTNL();
1454
1455#ifdef CONFIG_IP_MULTICAST
1456 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1457 (unsigned long)in_dev);
1458 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1459 (unsigned long)in_dev);
1460 in_dev->mr_qrv = sysctl_igmp_qrv;
1461#endif
1462
1463 spin_lock_init(&in_dev->mc_tomb_lock);
1464}
1465
1466
1467
1468void ip_mc_up(struct in_device *in_dev)
1469{
1470 struct ip_mc_list *pmc;
1471
1472 ASSERT_RTNL();
1473
1474#ifdef CONFIG_IP_MULTICAST
1475 in_dev->mr_qrv = sysctl_igmp_qrv;
1476#endif
1477 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1478
1479 for_each_pmc_rtnl(in_dev, pmc)
1480 igmp_group_added(pmc);
1481}
1482
1483
1484
1485
1486
1487void ip_mc_destroy_dev(struct in_device *in_dev)
1488{
1489 struct ip_mc_list *i;
1490
1491 ASSERT_RTNL();
1492
1493
1494 ip_mc_down(in_dev);
1495
1496 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1497 in_dev->mc_list = i->next_rcu;
1498 in_dev->mc_count--;
1499
1500
1501 ip_mc_clear_src(i);
1502 ip_ma_put(i);
1503 }
1504}
1505
1506
1507static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1508{
1509 struct net_device *dev = NULL;
1510 struct in_device *idev = NULL;
1511
1512 if (imr->imr_ifindex) {
1513 idev = inetdev_by_index(net, imr->imr_ifindex);
1514 return idev;
1515 }
1516 if (imr->imr_address.s_addr) {
1517 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1518 if (!dev)
1519 return NULL;
1520 }
1521
1522 if (!dev) {
1523 struct rtable *rt = ip_route_output(net,
1524 imr->imr_multiaddr.s_addr,
1525 0, 0, 0);
1526 if (!IS_ERR(rt)) {
1527 dev = rt->dst.dev;
1528 ip_rt_put(rt);
1529 }
1530 }
1531 if (dev) {
1532 imr->imr_ifindex = dev->ifindex;
1533 idev = __in_dev_get_rtnl(dev);
1534 }
1535 return idev;
1536}
1537
1538
1539
1540
1541int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1542int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1543#ifdef CONFIG_IP_MULTICAST
1544int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
1545#endif
1546
1547static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1548 __be32 *psfsrc)
1549{
1550 struct ip_sf_list *psf, *psf_prev;
1551 int rv = 0;
1552
1553 psf_prev = NULL;
1554 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1555 if (psf->sf_inaddr == *psfsrc)
1556 break;
1557 psf_prev = psf;
1558 }
1559 if (!psf || psf->sf_count[sfmode] == 0) {
1560
1561 return -ESRCH;
1562 }
1563 psf->sf_count[sfmode]--;
1564 if (psf->sf_count[sfmode] == 0) {
1565 ip_rt_multicast_event(pmc->interface);
1566 }
1567 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1568#ifdef CONFIG_IP_MULTICAST
1569 struct in_device *in_dev = pmc->interface;
1570#endif
1571
1572
1573 if (psf_prev)
1574 psf_prev->sf_next = psf->sf_next;
1575 else
1576 pmc->sources = psf->sf_next;
1577#ifdef CONFIG_IP_MULTICAST
1578 if (psf->sf_oldin &&
1579 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1580 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1581 psf->sf_next = pmc->tomb;
1582 pmc->tomb = psf;
1583 rv = 1;
1584 } else
1585#endif
1586 kfree(psf);
1587 }
1588 return rv;
1589}
1590
1591#ifndef CONFIG_IP_MULTICAST
1592#define igmp_ifc_event(x) do { } while (0)
1593#endif
1594
1595static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1596 int sfcount, __be32 *psfsrc, int delta)
1597{
1598 struct ip_mc_list *pmc;
1599 int changerec = 0;
1600 int i, err;
1601
1602 if (!in_dev)
1603 return -ENODEV;
1604 rcu_read_lock();
1605 for_each_pmc_rcu(in_dev, pmc) {
1606 if (*pmca == pmc->multiaddr)
1607 break;
1608 }
1609 if (!pmc) {
1610
1611 rcu_read_unlock();
1612 return -ESRCH;
1613 }
1614 spin_lock_bh(&pmc->lock);
1615 rcu_read_unlock();
1616#ifdef CONFIG_IP_MULTICAST
1617 sf_markstate(pmc);
1618#endif
1619 if (!delta) {
1620 err = -EINVAL;
1621 if (!pmc->sfcount[sfmode])
1622 goto out_unlock;
1623 pmc->sfcount[sfmode]--;
1624 }
1625 err = 0;
1626 for (i = 0; i < sfcount; i++) {
1627 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1628
1629 changerec |= rv > 0;
1630 if (!err && rv < 0)
1631 err = rv;
1632 }
1633 if (pmc->sfmode == MCAST_EXCLUDE &&
1634 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1635 pmc->sfcount[MCAST_INCLUDE]) {
1636#ifdef CONFIG_IP_MULTICAST
1637 struct ip_sf_list *psf;
1638#endif
1639
1640
1641 pmc->sfmode = MCAST_INCLUDE;
1642#ifdef CONFIG_IP_MULTICAST
1643 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1644 in_dev->mr_ifc_count = pmc->crcount;
1645 for (psf = pmc->sources; psf; psf = psf->sf_next)
1646 psf->sf_crcount = 0;
1647 igmp_ifc_event(pmc->interface);
1648 } else if (sf_setstate(pmc) || changerec) {
1649 igmp_ifc_event(pmc->interface);
1650#endif
1651 }
1652out_unlock:
1653 spin_unlock_bh(&pmc->lock);
1654 return err;
1655}
1656
1657
1658
1659
1660static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1661 __be32 *psfsrc)
1662{
1663 struct ip_sf_list *psf, *psf_prev;
1664
1665 psf_prev = NULL;
1666 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1667 if (psf->sf_inaddr == *psfsrc)
1668 break;
1669 psf_prev = psf;
1670 }
1671 if (!psf) {
1672 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1673 if (!psf)
1674 return -ENOBUFS;
1675 psf->sf_inaddr = *psfsrc;
1676 if (psf_prev) {
1677 psf_prev->sf_next = psf;
1678 } else
1679 pmc->sources = psf;
1680 }
1681 psf->sf_count[sfmode]++;
1682 if (psf->sf_count[sfmode] == 1) {
1683 ip_rt_multicast_event(pmc->interface);
1684 }
1685 return 0;
1686}
1687
1688#ifdef CONFIG_IP_MULTICAST
1689static void sf_markstate(struct ip_mc_list *pmc)
1690{
1691 struct ip_sf_list *psf;
1692 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1693
1694 for (psf = pmc->sources; psf; psf = psf->sf_next)
1695 if (pmc->sfcount[MCAST_EXCLUDE]) {
1696 psf->sf_oldin = mca_xcount ==
1697 psf->sf_count[MCAST_EXCLUDE] &&
1698 !psf->sf_count[MCAST_INCLUDE];
1699 } else
1700 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1701}
1702
1703static int sf_setstate(struct ip_mc_list *pmc)
1704{
1705 struct ip_sf_list *psf, *dpsf;
1706 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1707 int qrv = pmc->interface->mr_qrv;
1708 int new_in, rv;
1709
1710 rv = 0;
1711 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1712 if (pmc->sfcount[MCAST_EXCLUDE]) {
1713 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1714 !psf->sf_count[MCAST_INCLUDE];
1715 } else
1716 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1717 if (new_in) {
1718 if (!psf->sf_oldin) {
1719 struct ip_sf_list *prev = NULL;
1720
1721 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1722 if (dpsf->sf_inaddr == psf->sf_inaddr)
1723 break;
1724 prev = dpsf;
1725 }
1726 if (dpsf) {
1727 if (prev)
1728 prev->sf_next = dpsf->sf_next;
1729 else
1730 pmc->tomb = dpsf->sf_next;
1731 kfree(dpsf);
1732 }
1733 psf->sf_crcount = qrv;
1734 rv++;
1735 }
1736 } else if (psf->sf_oldin) {
1737
1738 psf->sf_crcount = 0;
1739
1740
1741
1742
1743 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1744 if (dpsf->sf_inaddr == psf->sf_inaddr)
1745 break;
1746 if (!dpsf) {
1747 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1748 if (!dpsf)
1749 continue;
1750 *dpsf = *psf;
1751
1752 dpsf->sf_next = pmc->tomb;
1753 pmc->tomb = dpsf;
1754 }
1755 dpsf->sf_crcount = qrv;
1756 rv++;
1757 }
1758 }
1759 return rv;
1760}
1761#endif
1762
1763
1764
1765
1766static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1767 int sfcount, __be32 *psfsrc, int delta)
1768{
1769 struct ip_mc_list *pmc;
1770 int isexclude;
1771 int i, err;
1772
1773 if (!in_dev)
1774 return -ENODEV;
1775 rcu_read_lock();
1776 for_each_pmc_rcu(in_dev, pmc) {
1777 if (*pmca == pmc->multiaddr)
1778 break;
1779 }
1780 if (!pmc) {
1781
1782 rcu_read_unlock();
1783 return -ESRCH;
1784 }
1785 spin_lock_bh(&pmc->lock);
1786 rcu_read_unlock();
1787
1788#ifdef CONFIG_IP_MULTICAST
1789 sf_markstate(pmc);
1790#endif
1791 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1792 if (!delta)
1793 pmc->sfcount[sfmode]++;
1794 err = 0;
1795 for (i = 0; i < sfcount; i++) {
1796 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1797 if (err)
1798 break;
1799 }
1800 if (err) {
1801 int j;
1802
1803 if (!delta)
1804 pmc->sfcount[sfmode]--;
1805 for (j = 0; j < i; j++)
1806 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1807 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1808#ifdef CONFIG_IP_MULTICAST
1809 struct ip_sf_list *psf;
1810 in_dev = pmc->interface;
1811#endif
1812
1813
1814 if (pmc->sfcount[MCAST_EXCLUDE])
1815 pmc->sfmode = MCAST_EXCLUDE;
1816 else if (pmc->sfcount[MCAST_INCLUDE])
1817 pmc->sfmode = MCAST_INCLUDE;
1818#ifdef CONFIG_IP_MULTICAST
1819
1820
1821 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1822 in_dev->mr_ifc_count = pmc->crcount;
1823 for (psf = pmc->sources; psf; psf = psf->sf_next)
1824 psf->sf_crcount = 0;
1825 igmp_ifc_event(in_dev);
1826 } else if (sf_setstate(pmc)) {
1827 igmp_ifc_event(in_dev);
1828#endif
1829 }
1830 spin_unlock_bh(&pmc->lock);
1831 return err;
1832}
1833
1834static void ip_mc_clear_src(struct ip_mc_list *pmc)
1835{
1836 struct ip_sf_list *psf, *nextpsf;
1837
1838 for (psf = pmc->tomb; psf; psf = nextpsf) {
1839 nextpsf = psf->sf_next;
1840 kfree(psf);
1841 }
1842 pmc->tomb = NULL;
1843 for (psf = pmc->sources; psf; psf = nextpsf) {
1844 nextpsf = psf->sf_next;
1845 kfree(psf);
1846 }
1847 pmc->sources = NULL;
1848 pmc->sfmode = MCAST_EXCLUDE;
1849 pmc->sfcount[MCAST_INCLUDE] = 0;
1850 pmc->sfcount[MCAST_EXCLUDE] = 1;
1851}
1852
1853
1854
1855
1856int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
1857{
1858 __be32 addr = imr->imr_multiaddr.s_addr;
1859 struct ip_mc_socklist *iml, *i;
1860 struct in_device *in_dev;
1861 struct inet_sock *inet = inet_sk(sk);
1862 struct net *net = sock_net(sk);
1863 int ifindex;
1864 int count = 0;
1865 int err;
1866
1867 ASSERT_RTNL();
1868
1869 if (!ipv4_is_multicast(addr))
1870 return -EINVAL;
1871
1872 in_dev = ip_mc_find_dev(net, imr);
1873
1874 if (!in_dev) {
1875 err = -ENODEV;
1876 goto done;
1877 }
1878
1879 err = -EADDRINUSE;
1880 ifindex = imr->imr_ifindex;
1881 for_each_pmc_rtnl(inet, i) {
1882 if (i->multi.imr_multiaddr.s_addr == addr &&
1883 i->multi.imr_ifindex == ifindex)
1884 goto done;
1885 count++;
1886 }
1887 err = -ENOBUFS;
1888 if (count >= sysctl_igmp_max_memberships)
1889 goto done;
1890 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1891 if (!iml)
1892 goto done;
1893
1894 memcpy(&iml->multi, imr, sizeof(*imr));
1895 iml->next_rcu = inet->mc_list;
1896 iml->sflist = NULL;
1897 iml->sfmode = MCAST_EXCLUDE;
1898 rcu_assign_pointer(inet->mc_list, iml);
1899 ip_mc_inc_group(in_dev, addr);
1900 err = 0;
1901done:
1902 return err;
1903}
1904EXPORT_SYMBOL(ip_mc_join_group);
1905
1906static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1907 struct in_device *in_dev)
1908{
1909 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1910 int err;
1911
1912 if (!psf) {
1913
1914 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1915 iml->sfmode, 0, NULL, 0);
1916 }
1917 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1918 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1919 RCU_INIT_POINTER(iml->sflist, NULL);
1920
1921 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1922 kfree_rcu(psf, rcu);
1923 return err;
1924}
1925
1926int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1927{
1928 struct inet_sock *inet = inet_sk(sk);
1929 struct ip_mc_socklist *iml;
1930 struct ip_mc_socklist __rcu **imlp;
1931 struct in_device *in_dev;
1932 struct net *net = sock_net(sk);
1933 __be32 group = imr->imr_multiaddr.s_addr;
1934 u32 ifindex;
1935 int ret = -EADDRNOTAVAIL;
1936
1937 ASSERT_RTNL();
1938
1939 in_dev = ip_mc_find_dev(net, imr);
1940 if (!in_dev) {
1941 ret = -ENODEV;
1942 goto out;
1943 }
1944 ifindex = imr->imr_ifindex;
1945 for (imlp = &inet->mc_list;
1946 (iml = rtnl_dereference(*imlp)) != NULL;
1947 imlp = &iml->next_rcu) {
1948 if (iml->multi.imr_multiaddr.s_addr != group)
1949 continue;
1950 if (ifindex) {
1951 if (iml->multi.imr_ifindex != ifindex)
1952 continue;
1953 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1954 iml->multi.imr_address.s_addr)
1955 continue;
1956
1957 (void) ip_mc_leave_src(sk, iml, in_dev);
1958
1959 *imlp = iml->next_rcu;
1960
1961 ip_mc_dec_group(in_dev, group);
1962
1963
1964 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1965 kfree_rcu(iml, rcu);
1966 return 0;
1967 }
1968out:
1969 return ret;
1970}
1971EXPORT_SYMBOL(ip_mc_leave_group);
1972
1973int ip_mc_source(int add, int omode, struct sock *sk, struct
1974 ip_mreq_source *mreqs, int ifindex)
1975{
1976 int err;
1977 struct ip_mreqn imr;
1978 __be32 addr = mreqs->imr_multiaddr;
1979 struct ip_mc_socklist *pmc;
1980 struct in_device *in_dev = NULL;
1981 struct inet_sock *inet = inet_sk(sk);
1982 struct ip_sf_socklist *psl;
1983 struct net *net = sock_net(sk);
1984 int leavegroup = 0;
1985 int i, j, rv;
1986
1987 if (!ipv4_is_multicast(addr))
1988 return -EINVAL;
1989
1990 ASSERT_RTNL();
1991
1992 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1993 imr.imr_address.s_addr = mreqs->imr_interface;
1994 imr.imr_ifindex = ifindex;
1995 in_dev = ip_mc_find_dev(net, &imr);
1996
1997 if (!in_dev) {
1998 err = -ENODEV;
1999 goto done;
2000 }
2001 err = -EADDRNOTAVAIL;
2002
2003 for_each_pmc_rtnl(inet, pmc) {
2004 if ((pmc->multi.imr_multiaddr.s_addr ==
2005 imr.imr_multiaddr.s_addr) &&
2006 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2007 break;
2008 }
2009 if (!pmc) {
2010 err = -EINVAL;
2011 goto done;
2012 }
2013
2014 if (pmc->sflist) {
2015 if (pmc->sfmode != omode) {
2016 err = -EINVAL;
2017 goto done;
2018 }
2019 } else if (pmc->sfmode != omode) {
2020
2021 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2022 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2023 NULL, 0);
2024 pmc->sfmode = omode;
2025 }
2026
2027 psl = rtnl_dereference(pmc->sflist);
2028 if (!add) {
2029 if (!psl)
2030 goto done;
2031 rv = !0;
2032 for (i = 0; i < psl->sl_count; i++) {
2033 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2034 sizeof(__be32));
2035 if (rv == 0)
2036 break;
2037 }
2038 if (rv)
2039 goto done;
2040
2041
2042 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2043 leavegroup = 1;
2044 goto done;
2045 }
2046
2047
2048 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2049 &mreqs->imr_sourceaddr, 1);
2050
2051 for (j = i+1; j < psl->sl_count; j++)
2052 psl->sl_addr[j-1] = psl->sl_addr[j];
2053 psl->sl_count--;
2054 err = 0;
2055 goto done;
2056 }
2057
2058
2059 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2060 err = -ENOBUFS;
2061 goto done;
2062 }
2063 if (!psl || psl->sl_count == psl->sl_max) {
2064 struct ip_sf_socklist *newpsl;
2065 int count = IP_SFBLOCK;
2066
2067 if (psl)
2068 count += psl->sl_max;
2069 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2070 if (!newpsl) {
2071 err = -ENOBUFS;
2072 goto done;
2073 }
2074 newpsl->sl_max = count;
2075 newpsl->sl_count = count - IP_SFBLOCK;
2076 if (psl) {
2077 for (i = 0; i < psl->sl_count; i++)
2078 newpsl->sl_addr[i] = psl->sl_addr[i];
2079
2080 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2081 kfree_rcu(psl, rcu);
2082 }
2083 rcu_assign_pointer(pmc->sflist, newpsl);
2084 psl = newpsl;
2085 }
2086 rv = 1;
2087 for (i = 0; i < psl->sl_count; i++) {
2088 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2089 sizeof(__be32));
2090 if (rv == 0)
2091 break;
2092 }
2093 if (rv == 0)
2094 goto done;
2095 for (j = psl->sl_count-1; j >= i; j--)
2096 psl->sl_addr[j+1] = psl->sl_addr[j];
2097 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2098 psl->sl_count++;
2099 err = 0;
2100
2101 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2102 &mreqs->imr_sourceaddr, 1);
2103done:
2104 if (leavegroup)
2105 err = ip_mc_leave_group(sk, &imr);
2106 return err;
2107}
2108
2109int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2110{
2111 int err = 0;
2112 struct ip_mreqn imr;
2113 __be32 addr = msf->imsf_multiaddr;
2114 struct ip_mc_socklist *pmc;
2115 struct in_device *in_dev;
2116 struct inet_sock *inet = inet_sk(sk);
2117 struct ip_sf_socklist *newpsl, *psl;
2118 struct net *net = sock_net(sk);
2119 int leavegroup = 0;
2120
2121 if (!ipv4_is_multicast(addr))
2122 return -EINVAL;
2123 if (msf->imsf_fmode != MCAST_INCLUDE &&
2124 msf->imsf_fmode != MCAST_EXCLUDE)
2125 return -EINVAL;
2126
2127 ASSERT_RTNL();
2128
2129 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2130 imr.imr_address.s_addr = msf->imsf_interface;
2131 imr.imr_ifindex = ifindex;
2132 in_dev = ip_mc_find_dev(net, &imr);
2133
2134 if (!in_dev) {
2135 err = -ENODEV;
2136 goto done;
2137 }
2138
2139
2140 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2141 leavegroup = 1;
2142 goto done;
2143 }
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) {
2151 err = -EINVAL;
2152 goto done;
2153 }
2154 if (msf->imsf_numsrc) {
2155 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2156 GFP_KERNEL);
2157 if (!newpsl) {
2158 err = -ENOBUFS;
2159 goto done;
2160 }
2161 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2162 memcpy(newpsl->sl_addr, msf->imsf_slist,
2163 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2164 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2165 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2166 if (err) {
2167 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2168 goto done;
2169 }
2170 } else {
2171 newpsl = NULL;
2172 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2173 msf->imsf_fmode, 0, NULL, 0);
2174 }
2175 psl = rtnl_dereference(pmc->sflist);
2176 if (psl) {
2177 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2178 psl->sl_count, psl->sl_addr, 0);
2179
2180 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2181 kfree_rcu(psl, rcu);
2182 } else
2183 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2184 0, NULL, 0);
2185 rcu_assign_pointer(pmc->sflist, newpsl);
2186 pmc->sfmode = msf->imsf_fmode;
2187 err = 0;
2188done:
2189 if (leavegroup)
2190 err = ip_mc_leave_group(sk, &imr);
2191 return err;
2192}
2193
2194int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2195 struct ip_msfilter __user *optval, int __user *optlen)
2196{
2197 int err, len, count, copycount;
2198 struct ip_mreqn imr;
2199 __be32 addr = msf->imsf_multiaddr;
2200 struct ip_mc_socklist *pmc;
2201 struct in_device *in_dev;
2202 struct inet_sock *inet = inet_sk(sk);
2203 struct ip_sf_socklist *psl;
2204 struct net *net = sock_net(sk);
2205
2206 if (!ipv4_is_multicast(addr))
2207 return -EINVAL;
2208
2209 rtnl_lock();
2210
2211 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2212 imr.imr_address.s_addr = msf->imsf_interface;
2213 imr.imr_ifindex = 0;
2214 in_dev = ip_mc_find_dev(net, &imr);
2215
2216 if (!in_dev) {
2217 err = -ENODEV;
2218 goto done;
2219 }
2220 err = -EADDRNOTAVAIL;
2221
2222 for_each_pmc_rtnl(inet, pmc) {
2223 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2224 pmc->multi.imr_ifindex == imr.imr_ifindex)
2225 break;
2226 }
2227 if (!pmc)
2228 goto done;
2229 msf->imsf_fmode = pmc->sfmode;
2230 psl = rtnl_dereference(pmc->sflist);
2231 rtnl_unlock();
2232 if (!psl) {
2233 len = 0;
2234 count = 0;
2235 } else {
2236 count = psl->sl_count;
2237 }
2238 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2239 len = copycount * sizeof(psl->sl_addr[0]);
2240 msf->imsf_numsrc = count;
2241 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2242 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2243 return -EFAULT;
2244 }
2245 if (len &&
2246 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2247 return -EFAULT;
2248 return 0;
2249done:
2250 rtnl_unlock();
2251 return err;
2252}
2253
2254int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2255 struct group_filter __user *optval, int __user *optlen)
2256{
2257 int err, i, count, copycount;
2258 struct sockaddr_in *psin;
2259 __be32 addr;
2260 struct ip_mc_socklist *pmc;
2261 struct inet_sock *inet = inet_sk(sk);
2262 struct ip_sf_socklist *psl;
2263
2264 psin = (struct sockaddr_in *)&gsf->gf_group;
2265 if (psin->sin_family != AF_INET)
2266 return -EINVAL;
2267 addr = psin->sin_addr.s_addr;
2268 if (!ipv4_is_multicast(addr))
2269 return -EINVAL;
2270
2271 rtnl_lock();
2272
2273 err = -EADDRNOTAVAIL;
2274
2275 for_each_pmc_rtnl(inet, pmc) {
2276 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2277 pmc->multi.imr_ifindex == gsf->gf_interface)
2278 break;
2279 }
2280 if (!pmc)
2281 goto done;
2282 gsf->gf_fmode = pmc->sfmode;
2283 psl = rtnl_dereference(pmc->sflist);
2284 rtnl_unlock();
2285 count = psl ? psl->sl_count : 0;
2286 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2287 gsf->gf_numsrc = count;
2288 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2289 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2290 return -EFAULT;
2291 }
2292 for (i = 0; i < copycount; i++) {
2293 struct sockaddr_storage ss;
2294
2295 psin = (struct sockaddr_in *)&ss;
2296 memset(&ss, 0, sizeof(ss));
2297 psin->sin_family = AF_INET;
2298 psin->sin_addr.s_addr = psl->sl_addr[i];
2299 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2300 return -EFAULT;
2301 }
2302 return 0;
2303done:
2304 rtnl_unlock();
2305 return err;
2306}
2307
2308
2309
2310
2311int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2312{
2313 struct inet_sock *inet = inet_sk(sk);
2314 struct ip_mc_socklist *pmc;
2315 struct ip_sf_socklist *psl;
2316 int i;
2317 int ret;
2318
2319 ret = 1;
2320 if (!ipv4_is_multicast(loc_addr))
2321 goto out;
2322
2323 rcu_read_lock();
2324 for_each_pmc_rcu(inet, pmc) {
2325 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2326 pmc->multi.imr_ifindex == dif)
2327 break;
2328 }
2329 ret = inet->mc_all;
2330 if (!pmc)
2331 goto unlock;
2332 psl = rcu_dereference(pmc->sflist);
2333 ret = (pmc->sfmode == MCAST_EXCLUDE);
2334 if (!psl)
2335 goto unlock;
2336
2337 for (i = 0; i < psl->sl_count; i++) {
2338 if (psl->sl_addr[i] == rmt_addr)
2339 break;
2340 }
2341 ret = 0;
2342 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2343 goto unlock;
2344 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2345 goto unlock;
2346 ret = 1;
2347unlock:
2348 rcu_read_unlock();
2349out:
2350 return ret;
2351}
2352
2353
2354
2355
2356
2357void ip_mc_drop_socket(struct sock *sk)
2358{
2359 struct inet_sock *inet = inet_sk(sk);
2360 struct ip_mc_socklist *iml;
2361 struct net *net = sock_net(sk);
2362
2363 if (!inet->mc_list)
2364 return;
2365
2366 rtnl_lock();
2367 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2368 struct in_device *in_dev;
2369
2370 inet->mc_list = iml->next_rcu;
2371 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2372 (void) ip_mc_leave_src(sk, iml, in_dev);
2373 if (in_dev)
2374 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2375
2376 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2377 kfree_rcu(iml, rcu);
2378 }
2379 rtnl_unlock();
2380}
2381
2382
2383int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2384{
2385 struct ip_mc_list *im;
2386 struct ip_mc_list __rcu **mc_hash;
2387 struct ip_sf_list *psf;
2388 int rv = 0;
2389
2390 mc_hash = rcu_dereference(in_dev->mc_hash);
2391 if (mc_hash) {
2392 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2393
2394 for (im = rcu_dereference(mc_hash[hash]);
2395 im != NULL;
2396 im = rcu_dereference(im->next_hash)) {
2397 if (im->multiaddr == mc_addr)
2398 break;
2399 }
2400 } else {
2401 for_each_pmc_rcu(in_dev, im) {
2402 if (im->multiaddr == mc_addr)
2403 break;
2404 }
2405 }
2406 if (im && proto == IPPROTO_IGMP) {
2407 rv = 1;
2408 } else if (im) {
2409 if (src_addr) {
2410 for (psf = im->sources; psf; psf = psf->sf_next) {
2411 if (psf->sf_inaddr == src_addr)
2412 break;
2413 }
2414 if (psf)
2415 rv = psf->sf_count[MCAST_INCLUDE] ||
2416 psf->sf_count[MCAST_EXCLUDE] !=
2417 im->sfcount[MCAST_EXCLUDE];
2418 else
2419 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2420 } else
2421 rv = 1;
2422 }
2423 return rv;
2424}
2425
2426#if defined(CONFIG_PROC_FS)
2427struct igmp_mc_iter_state {
2428 struct seq_net_private p;
2429 struct net_device *dev;
2430 struct in_device *in_dev;
2431};
2432
2433#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2434
2435static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2436{
2437 struct net *net = seq_file_net(seq);
2438 struct ip_mc_list *im = NULL;
2439 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2440
2441 state->in_dev = NULL;
2442 for_each_netdev_rcu(net, state->dev) {
2443 struct in_device *in_dev;
2444
2445 in_dev = __in_dev_get_rcu(state->dev);
2446 if (!in_dev)
2447 continue;
2448 im = rcu_dereference(in_dev->mc_list);
2449 if (im) {
2450 state->in_dev = in_dev;
2451 break;
2452 }
2453 }
2454 return im;
2455}
2456
2457static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2458{
2459 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2460
2461 im = rcu_dereference(im->next_rcu);
2462 while (!im) {
2463 state->dev = next_net_device_rcu(state->dev);
2464 if (!state->dev) {
2465 state->in_dev = NULL;
2466 break;
2467 }
2468 state->in_dev = __in_dev_get_rcu(state->dev);
2469 if (!state->in_dev)
2470 continue;
2471 im = rcu_dereference(state->in_dev->mc_list);
2472 }
2473 return im;
2474}
2475
2476static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2477{
2478 struct ip_mc_list *im = igmp_mc_get_first(seq);
2479 if (im)
2480 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2481 --pos;
2482 return pos ? NULL : im;
2483}
2484
2485static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2486 __acquires(rcu)
2487{
2488 rcu_read_lock();
2489 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2490}
2491
2492static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2493{
2494 struct ip_mc_list *im;
2495 if (v == SEQ_START_TOKEN)
2496 im = igmp_mc_get_first(seq);
2497 else
2498 im = igmp_mc_get_next(seq, v);
2499 ++*pos;
2500 return im;
2501}
2502
2503static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2504 __releases(rcu)
2505{
2506 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2507
2508 state->in_dev = NULL;
2509 state->dev = NULL;
2510 rcu_read_unlock();
2511}
2512
2513static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2514{
2515 if (v == SEQ_START_TOKEN)
2516 seq_puts(seq,
2517 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2518 else {
2519 struct ip_mc_list *im = (struct ip_mc_list *)v;
2520 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2521 char *querier;
2522 long delta;
2523
2524#ifdef CONFIG_IP_MULTICAST
2525 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2526 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2527 "V3";
2528#else
2529 querier = "NONE";
2530#endif
2531
2532 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2533 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2534 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2535 }
2536
2537 delta = im->timer.expires - jiffies;
2538 seq_printf(seq,
2539 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2540 im->multiaddr, im->users,
2541 im->tm_running,
2542 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2543 im->reporter);
2544 }
2545 return 0;
2546}
2547
2548static const struct seq_operations igmp_mc_seq_ops = {
2549 .start = igmp_mc_seq_start,
2550 .next = igmp_mc_seq_next,
2551 .stop = igmp_mc_seq_stop,
2552 .show = igmp_mc_seq_show,
2553};
2554
2555static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2556{
2557 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2558 sizeof(struct igmp_mc_iter_state));
2559}
2560
2561static const struct file_operations igmp_mc_seq_fops = {
2562 .owner = THIS_MODULE,
2563 .open = igmp_mc_seq_open,
2564 .read = seq_read,
2565 .llseek = seq_lseek,
2566 .release = seq_release_net,
2567};
2568
2569struct igmp_mcf_iter_state {
2570 struct seq_net_private p;
2571 struct net_device *dev;
2572 struct in_device *idev;
2573 struct ip_mc_list *im;
2574};
2575
2576#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2577
2578static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2579{
2580 struct net *net = seq_file_net(seq);
2581 struct ip_sf_list *psf = NULL;
2582 struct ip_mc_list *im = NULL;
2583 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2584
2585 state->idev = NULL;
2586 state->im = NULL;
2587 for_each_netdev_rcu(net, state->dev) {
2588 struct in_device *idev;
2589 idev = __in_dev_get_rcu(state->dev);
2590 if (unlikely(!idev))
2591 continue;
2592 im = rcu_dereference(idev->mc_list);
2593 if (likely(im)) {
2594 spin_lock_bh(&im->lock);
2595 psf = im->sources;
2596 if (likely(psf)) {
2597 state->im = im;
2598 state->idev = idev;
2599 break;
2600 }
2601 spin_unlock_bh(&im->lock);
2602 }
2603 }
2604 return psf;
2605}
2606
2607static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2608{
2609 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2610
2611 psf = psf->sf_next;
2612 while (!psf) {
2613 spin_unlock_bh(&state->im->lock);
2614 state->im = state->im->next;
2615 while (!state->im) {
2616 state->dev = next_net_device_rcu(state->dev);
2617 if (!state->dev) {
2618 state->idev = NULL;
2619 goto out;
2620 }
2621 state->idev = __in_dev_get_rcu(state->dev);
2622 if (!state->idev)
2623 continue;
2624 state->im = rcu_dereference(state->idev->mc_list);
2625 }
2626 if (!state->im)
2627 break;
2628 spin_lock_bh(&state->im->lock);
2629 psf = state->im->sources;
2630 }
2631out:
2632 return psf;
2633}
2634
2635static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2636{
2637 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2638 if (psf)
2639 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2640 --pos;
2641 return pos ? NULL : psf;
2642}
2643
2644static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2645 __acquires(rcu)
2646{
2647 rcu_read_lock();
2648 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2649}
2650
2651static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2652{
2653 struct ip_sf_list *psf;
2654 if (v == SEQ_START_TOKEN)
2655 psf = igmp_mcf_get_first(seq);
2656 else
2657 psf = igmp_mcf_get_next(seq, v);
2658 ++*pos;
2659 return psf;
2660}
2661
2662static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2663 __releases(rcu)
2664{
2665 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2666 if (likely(state->im)) {
2667 spin_unlock_bh(&state->im->lock);
2668 state->im = NULL;
2669 }
2670 state->idev = NULL;
2671 state->dev = NULL;
2672 rcu_read_unlock();
2673}
2674
2675static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2676{
2677 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2678 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2679
2680 if (v == SEQ_START_TOKEN) {
2681 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2682 } else {
2683 seq_printf(seq,
2684 "%3d %6.6s 0x%08x "
2685 "0x%08x %6lu %6lu\n",
2686 state->dev->ifindex, state->dev->name,
2687 ntohl(state->im->multiaddr),
2688 ntohl(psf->sf_inaddr),
2689 psf->sf_count[MCAST_INCLUDE],
2690 psf->sf_count[MCAST_EXCLUDE]);
2691 }
2692 return 0;
2693}
2694
2695static const struct seq_operations igmp_mcf_seq_ops = {
2696 .start = igmp_mcf_seq_start,
2697 .next = igmp_mcf_seq_next,
2698 .stop = igmp_mcf_seq_stop,
2699 .show = igmp_mcf_seq_show,
2700};
2701
2702static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2703{
2704 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2705 sizeof(struct igmp_mcf_iter_state));
2706}
2707
2708static const struct file_operations igmp_mcf_seq_fops = {
2709 .owner = THIS_MODULE,
2710 .open = igmp_mcf_seq_open,
2711 .read = seq_read,
2712 .llseek = seq_lseek,
2713 .release = seq_release_net,
2714};
2715
2716static int __net_init igmp_net_init(struct net *net)
2717{
2718 struct proc_dir_entry *pde;
2719 int err;
2720
2721 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2722 if (!pde)
2723 goto out_igmp;
2724 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2725 &igmp_mcf_seq_fops);
2726 if (!pde)
2727 goto out_mcfilter;
2728 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2729 SOCK_DGRAM, 0, net);
2730 if (err < 0) {
2731 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2732 err);
2733 goto out_sock;
2734 }
2735
2736 return 0;
2737
2738out_sock:
2739 remove_proc_entry("mcfilter", net->proc_net);
2740out_mcfilter:
2741 remove_proc_entry("igmp", net->proc_net);
2742out_igmp:
2743 return -ENOMEM;
2744}
2745
2746static void __net_exit igmp_net_exit(struct net *net)
2747{
2748 remove_proc_entry("mcfilter", net->proc_net);
2749 remove_proc_entry("igmp", net->proc_net);
2750 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2751}
2752
2753static struct pernet_operations igmp_net_ops = {
2754 .init = igmp_net_init,
2755 .exit = igmp_net_exit,
2756};
2757#endif
2758
2759static int igmp_netdev_event(struct notifier_block *this,
2760 unsigned long event, void *ptr)
2761{
2762 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2763 struct in_device *in_dev;
2764
2765 switch (event) {
2766 case NETDEV_RESEND_IGMP:
2767 in_dev = __in_dev_get_rtnl(dev);
2768 if (in_dev)
2769 ip_mc_rejoin_groups(in_dev);
2770 break;
2771 default:
2772 break;
2773 }
2774 return NOTIFY_DONE;
2775}
2776
2777static struct notifier_block igmp_notifier = {
2778 .notifier_call = igmp_netdev_event,
2779};
2780
2781int __init igmp_mc_init(void)
2782{
2783#if defined(CONFIG_PROC_FS)
2784 int err;
2785
2786 err = register_pernet_subsys(&igmp_net_ops);
2787 if (err)
2788 return err;
2789 err = register_netdevice_notifier(&igmp_notifier);
2790 if (err)
2791 goto reg_notif_fail;
2792 return 0;
2793
2794reg_notif_fail:
2795 unregister_pernet_subsys(&igmp_net_ops);
2796 return err;
2797#else
2798 return register_netdevice_notifier(&igmp_notifier);
2799#endif
2800}
2801