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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Linux NET3: Internet Group Management Protocol [IGMP]
4 *
5 * This code implements the IGMP protocol as defined in RFC1112. There has
6 * been a further revision of this protocol since which is now supported.
7 *
8 * If you have trouble with this module be careful what gcc you have used,
9 * the older version didn't come out right using gcc 2.5.8, the newer one
10 * seems to fall out with gcc 2.6.2.
11 *
12 * Authors:
13 * Alan Cox <alan@lxorguk.ukuu.org.uk>
14 *
15 * Fixes:
16 *
17 * Alan Cox : Added lots of __inline__ to optimise
18 * the memory usage of all the tiny little
19 * functions.
20 * Alan Cox : Dumped the header building experiment.
21 * Alan Cox : Minor tweaks ready for multicast routing
22 * and extended IGMP protocol.
23 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
24 * writes utterly bogus code otherwise (sigh)
25 * fixed IGMP loopback to behave in the manner
26 * desired by mrouted, fixed the fact it has been
27 * broken since 1.3.6 and cleaned up a few minor
28 * points.
29 *
30 * Chih-Jen Chang : Tried to revise IGMP to Version 2
31 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
32 * The enhancements are mainly based on Steve Deering's
33 * ipmulti-3.5 source code.
34 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
35 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
36 * the mrouted version on that device.
37 * Chih-Jen Chang : Added the max_resp_time parameter to
38 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
39 * to identify the multicast router version
40 * and do what the IGMP version 2 specified.
41 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
42 * Tsu-Sheng Tsao if the specified time expired.
43 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
44 * Alan Cox : Use GFP_ATOMIC in the right places.
45 * Christian Daudt : igmp timer wasn't set for local group
46 * memberships but was being deleted,
47 * which caused a "del_timer() called
48 * from %p with timer not initialized\n"
49 * message (960131).
50 * Christian Daudt : removed del_timer from
51 * igmp_timer_expire function (960205).
52 * Christian Daudt : igmp_heard_report now only calls
53 * igmp_timer_expire if tm->running is
54 * true (960216).
55 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
56 * igmp_heard_query never trigger. Expiry
57 * miscalculation fixed in igmp_heard_query
58 * and random() made to return unsigned to
59 * prevent negative expiry times.
60 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
61 * fix from pending 2.1.x patches.
62 * Alan Cox: Forget to enable FDDI support earlier.
63 * Alexey Kuznetsov: Fixed leaving groups on device down.
64 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
65 * David L Stevens: IGMPv3 support, with help from
66 * Vinay Kulkarni
67 */
68
69#include <linux/module.h>
70#include <linux/slab.h>
71#include <linux/uaccess.h>
72#include <linux/types.h>
73#include <linux/kernel.h>
74#include <linux/jiffies.h>
75#include <linux/string.h>
76#include <linux/socket.h>
77#include <linux/sockios.h>
78#include <linux/in.h>
79#include <linux/inet.h>
80#include <linux/netdevice.h>
81#include <linux/skbuff.h>
82#include <linux/inetdevice.h>
83#include <linux/igmp.h>
84#include <linux/if_arp.h>
85#include <linux/rtnetlink.h>
86#include <linux/times.h>
87#include <linux/pkt_sched.h>
88#include <linux/byteorder/generic.h>
89
90#include <net/net_namespace.h>
91#include <net/arp.h>
92#include <net/ip.h>
93#include <net/protocol.h>
94#include <net/route.h>
95#include <net/sock.h>
96#include <net/checksum.h>
97#include <net/inet_common.h>
98#include <linux/netfilter_ipv4.h>
99#ifdef CONFIG_IP_MROUTE
100#include <linux/mroute.h>
101#endif
102#ifdef CONFIG_PROC_FS
103#include <linux/proc_fs.h>
104#include <linux/seq_file.h>
105#endif
106
107#ifdef CONFIG_IP_MULTICAST
108/* Parameter names and values are taken from igmp-v2-06 draft */
109
110#define IGMP_QUERY_INTERVAL (125*HZ)
111#define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
112
113#define IGMP_INITIAL_REPORT_DELAY (1)
114
115/* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
116 * IGMP specs require to report membership immediately after
117 * joining a group, but we delay the first report by a
118 * small interval. It seems more natural and still does not
119 * contradict to specs provided this delay is small enough.
120 */
121
122#define IGMP_V1_SEEN(in_dev) \
123 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
124 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
125 ((in_dev)->mr_v1_seen && \
126 time_before(jiffies, (in_dev)->mr_v1_seen)))
127#define IGMP_V2_SEEN(in_dev) \
128 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
129 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
130 ((in_dev)->mr_v2_seen && \
131 time_before(jiffies, (in_dev)->mr_v2_seen)))
132
133static int unsolicited_report_interval(struct in_device *in_dev)
134{
135 int interval_ms, interval_jiffies;
136
137 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
138 interval_ms = IN_DEV_CONF_GET(
139 in_dev,
140 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
141 else /* v3 */
142 interval_ms = IN_DEV_CONF_GET(
143 in_dev,
144 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
145
146 interval_jiffies = msecs_to_jiffies(interval_ms);
147
148 /* _timer functions can't handle a delay of 0 jiffies so ensure
149 * we always return a positive value.
150 */
151 if (interval_jiffies <= 0)
152 interval_jiffies = 1;
153 return interval_jiffies;
154}
155
156static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
157 gfp_t gfp);
158static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
159static void igmpv3_clear_delrec(struct in_device *in_dev);
160static int sf_setstate(struct ip_mc_list *pmc);
161static void sf_markstate(struct ip_mc_list *pmc);
162#endif
163static void ip_mc_clear_src(struct ip_mc_list *pmc);
164static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
165 int sfcount, __be32 *psfsrc, int delta);
166
167static void ip_ma_put(struct ip_mc_list *im)
168{
169 if (refcount_dec_and_test(&im->refcnt)) {
170 in_dev_put(im->interface);
171 kfree_rcu(im, rcu);
172 }
173}
174
175#define for_each_pmc_rcu(in_dev, pmc) \
176 for (pmc = rcu_dereference(in_dev->mc_list); \
177 pmc != NULL; \
178 pmc = rcu_dereference(pmc->next_rcu))
179
180#define for_each_pmc_rtnl(in_dev, pmc) \
181 for (pmc = rtnl_dereference(in_dev->mc_list); \
182 pmc != NULL; \
183 pmc = rtnl_dereference(pmc->next_rcu))
184
185static void ip_sf_list_clear_all(struct ip_sf_list *psf)
186{
187 struct ip_sf_list *next;
188
189 while (psf) {
190 next = psf->sf_next;
191 kfree(psf);
192 psf = next;
193 }
194}
195
196#ifdef CONFIG_IP_MULTICAST
197
198/*
199 * Timer management
200 */
201
202static void igmp_stop_timer(struct ip_mc_list *im)
203{
204 spin_lock_bh(&im->lock);
205 if (del_timer(&im->timer))
206 refcount_dec(&im->refcnt);
207 im->tm_running = 0;
208 im->reporter = 0;
209 im->unsolicit_count = 0;
210 spin_unlock_bh(&im->lock);
211}
212
213/* It must be called with locked im->lock */
214static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
215{
216 int tv = prandom_u32() % max_delay;
217
218 im->tm_running = 1;
219 if (!mod_timer(&im->timer, jiffies+tv+2))
220 refcount_inc(&im->refcnt);
221}
222
223static void igmp_gq_start_timer(struct in_device *in_dev)
224{
225 int tv = prandom_u32() % in_dev->mr_maxdelay;
226 unsigned long exp = jiffies + tv + 2;
227
228 if (in_dev->mr_gq_running &&
229 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
230 return;
231
232 in_dev->mr_gq_running = 1;
233 if (!mod_timer(&in_dev->mr_gq_timer, exp))
234 in_dev_hold(in_dev);
235}
236
237static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
238{
239 int tv = prandom_u32() % delay;
240
241 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
242 in_dev_hold(in_dev);
243}
244
245static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
246{
247 spin_lock_bh(&im->lock);
248 im->unsolicit_count = 0;
249 if (del_timer(&im->timer)) {
250 if ((long)(im->timer.expires-jiffies) < max_delay) {
251 add_timer(&im->timer);
252 im->tm_running = 1;
253 spin_unlock_bh(&im->lock);
254 return;
255 }
256 refcount_dec(&im->refcnt);
257 }
258 igmp_start_timer(im, max_delay);
259 spin_unlock_bh(&im->lock);
260}
261
262
263/*
264 * Send an IGMP report.
265 */
266
267#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
268
269
270static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
271 int gdeleted, int sdeleted)
272{
273 switch (type) {
274 case IGMPV3_MODE_IS_INCLUDE:
275 case IGMPV3_MODE_IS_EXCLUDE:
276 if (gdeleted || sdeleted)
277 return 0;
278 if (!(pmc->gsquery && !psf->sf_gsresp)) {
279 if (pmc->sfmode == MCAST_INCLUDE)
280 return 1;
281 /* don't include if this source is excluded
282 * in all filters
283 */
284 if (psf->sf_count[MCAST_INCLUDE])
285 return type == IGMPV3_MODE_IS_INCLUDE;
286 return pmc->sfcount[MCAST_EXCLUDE] ==
287 psf->sf_count[MCAST_EXCLUDE];
288 }
289 return 0;
290 case IGMPV3_CHANGE_TO_INCLUDE:
291 if (gdeleted || sdeleted)
292 return 0;
293 return psf->sf_count[MCAST_INCLUDE] != 0;
294 case IGMPV3_CHANGE_TO_EXCLUDE:
295 if (gdeleted || sdeleted)
296 return 0;
297 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
298 psf->sf_count[MCAST_INCLUDE])
299 return 0;
300 return pmc->sfcount[MCAST_EXCLUDE] ==
301 psf->sf_count[MCAST_EXCLUDE];
302 case IGMPV3_ALLOW_NEW_SOURCES:
303 if (gdeleted || !psf->sf_crcount)
304 return 0;
305 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
306 case IGMPV3_BLOCK_OLD_SOURCES:
307 if (pmc->sfmode == MCAST_INCLUDE)
308 return gdeleted || (psf->sf_crcount && sdeleted);
309 return psf->sf_crcount && !gdeleted && !sdeleted;
310 }
311 return 0;
312}
313
314static int
315igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
316{
317 struct ip_sf_list *psf;
318 int scount = 0;
319
320 for (psf = pmc->sources; psf; psf = psf->sf_next) {
321 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
322 continue;
323 scount++;
324 }
325 return scount;
326}
327
328/* source address selection per RFC 3376 section 4.2.13 */
329static __be32 igmpv3_get_srcaddr(struct net_device *dev,
330 const struct flowi4 *fl4)
331{
332 struct in_device *in_dev = __in_dev_get_rcu(dev);
333 const struct in_ifaddr *ifa;
334
335 if (!in_dev)
336 return htonl(INADDR_ANY);
337
338 in_dev_for_each_ifa_rcu(ifa, in_dev) {
339 if (fl4->saddr == ifa->ifa_local)
340 return fl4->saddr;
341 }
342
343 return htonl(INADDR_ANY);
344}
345
346static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
347{
348 struct sk_buff *skb;
349 struct rtable *rt;
350 struct iphdr *pip;
351 struct igmpv3_report *pig;
352 struct net *net = dev_net(dev);
353 struct flowi4 fl4;
354 int hlen = LL_RESERVED_SPACE(dev);
355 int tlen = dev->needed_tailroom;
356 unsigned int size = mtu;
357
358 while (1) {
359 skb = alloc_skb(size + hlen + tlen,
360 GFP_ATOMIC | __GFP_NOWARN);
361 if (skb)
362 break;
363 size >>= 1;
364 if (size < 256)
365 return NULL;
366 }
367 skb->priority = TC_PRIO_CONTROL;
368
369 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
370 0, 0,
371 IPPROTO_IGMP, 0, dev->ifindex);
372 if (IS_ERR(rt)) {
373 kfree_skb(skb);
374 return NULL;
375 }
376
377 skb_dst_set(skb, &rt->dst);
378 skb->dev = dev;
379
380 skb_reserve(skb, hlen);
381 skb_tailroom_reserve(skb, mtu, tlen);
382
383 skb_reset_network_header(skb);
384 pip = ip_hdr(skb);
385 skb_put(skb, sizeof(struct iphdr) + 4);
386
387 pip->version = 4;
388 pip->ihl = (sizeof(struct iphdr)+4)>>2;
389 pip->tos = 0xc0;
390 pip->frag_off = htons(IP_DF);
391 pip->ttl = 1;
392 pip->daddr = fl4.daddr;
393
394 rcu_read_lock();
395 pip->saddr = igmpv3_get_srcaddr(dev, &fl4);
396 rcu_read_unlock();
397
398 pip->protocol = IPPROTO_IGMP;
399 pip->tot_len = 0; /* filled in later */
400 ip_select_ident(net, skb, NULL);
401 ((u8 *)&pip[1])[0] = IPOPT_RA;
402 ((u8 *)&pip[1])[1] = 4;
403 ((u8 *)&pip[1])[2] = 0;
404 ((u8 *)&pip[1])[3] = 0;
405
406 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
407 skb_put(skb, sizeof(*pig));
408 pig = igmpv3_report_hdr(skb);
409 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
410 pig->resv1 = 0;
411 pig->csum = 0;
412 pig->resv2 = 0;
413 pig->ngrec = 0;
414 return skb;
415}
416
417static int igmpv3_sendpack(struct sk_buff *skb)
418{
419 struct igmphdr *pig = igmp_hdr(skb);
420 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
421
422 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
423
424 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
425}
426
427static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
428{
429 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
430}
431
432static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
433 int type, struct igmpv3_grec **ppgr, unsigned int mtu)
434{
435 struct net_device *dev = pmc->interface->dev;
436 struct igmpv3_report *pih;
437 struct igmpv3_grec *pgr;
438
439 if (!skb) {
440 skb = igmpv3_newpack(dev, mtu);
441 if (!skb)
442 return NULL;
443 }
444 pgr = skb_put(skb, sizeof(struct igmpv3_grec));
445 pgr->grec_type = type;
446 pgr->grec_auxwords = 0;
447 pgr->grec_nsrcs = 0;
448 pgr->grec_mca = pmc->multiaddr;
449 pih = igmpv3_report_hdr(skb);
450 pih->ngrec = htons(ntohs(pih->ngrec)+1);
451 *ppgr = pgr;
452 return skb;
453}
454
455#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
456
457static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
458 int type, int gdeleted, int sdeleted)
459{
460 struct net_device *dev = pmc->interface->dev;
461 struct net *net = dev_net(dev);
462 struct igmpv3_report *pih;
463 struct igmpv3_grec *pgr = NULL;
464 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
465 int scount, stotal, first, isquery, truncate;
466 unsigned int mtu;
467
468 if (pmc->multiaddr == IGMP_ALL_HOSTS)
469 return skb;
470 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
471 return skb;
472
473 mtu = READ_ONCE(dev->mtu);
474 if (mtu < IPV4_MIN_MTU)
475 return skb;
476
477 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
478 type == IGMPV3_MODE_IS_EXCLUDE;
479 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
480 type == IGMPV3_CHANGE_TO_EXCLUDE;
481
482 stotal = scount = 0;
483
484 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
485
486 if (!*psf_list)
487 goto empty_source;
488
489 pih = skb ? igmpv3_report_hdr(skb) : NULL;
490
491 /* EX and TO_EX get a fresh packet, if needed */
492 if (truncate) {
493 if (pih && pih->ngrec &&
494 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
495 if (skb)
496 igmpv3_sendpack(skb);
497 skb = igmpv3_newpack(dev, mtu);
498 }
499 }
500 first = 1;
501 psf_prev = NULL;
502 for (psf = *psf_list; psf; psf = psf_next) {
503 __be32 *psrc;
504
505 psf_next = psf->sf_next;
506
507 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
508 psf_prev = psf;
509 continue;
510 }
511
512 /* Based on RFC3376 5.1. Should not send source-list change
513 * records when there is a filter mode change.
514 */
515 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
516 (!gdeleted && pmc->crcount)) &&
517 (type == IGMPV3_ALLOW_NEW_SOURCES ||
518 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
519 goto decrease_sf_crcount;
520
521 /* clear marks on query responses */
522 if (isquery)
523 psf->sf_gsresp = 0;
524
525 if (AVAILABLE(skb) < sizeof(__be32) +
526 first*sizeof(struct igmpv3_grec)) {
527 if (truncate && !first)
528 break; /* truncate these */
529 if (pgr)
530 pgr->grec_nsrcs = htons(scount);
531 if (skb)
532 igmpv3_sendpack(skb);
533 skb = igmpv3_newpack(dev, mtu);
534 first = 1;
535 scount = 0;
536 }
537 if (first) {
538 skb = add_grhead(skb, pmc, type, &pgr, mtu);
539 first = 0;
540 }
541 if (!skb)
542 return NULL;
543 psrc = skb_put(skb, sizeof(__be32));
544 *psrc = psf->sf_inaddr;
545 scount++; stotal++;
546 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
547 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
548decrease_sf_crcount:
549 psf->sf_crcount--;
550 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
551 if (psf_prev)
552 psf_prev->sf_next = psf->sf_next;
553 else
554 *psf_list = psf->sf_next;
555 kfree(psf);
556 continue;
557 }
558 }
559 psf_prev = psf;
560 }
561
562empty_source:
563 if (!stotal) {
564 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
565 type == IGMPV3_BLOCK_OLD_SOURCES)
566 return skb;
567 if (pmc->crcount || isquery) {
568 /* make sure we have room for group header */
569 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
570 igmpv3_sendpack(skb);
571 skb = NULL; /* add_grhead will get a new one */
572 }
573 skb = add_grhead(skb, pmc, type, &pgr, mtu);
574 }
575 }
576 if (pgr)
577 pgr->grec_nsrcs = htons(scount);
578
579 if (isquery)
580 pmc->gsquery = 0; /* clear query state on report */
581 return skb;
582}
583
584static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
585{
586 struct sk_buff *skb = NULL;
587 struct net *net = dev_net(in_dev->dev);
588 int type;
589
590 if (!pmc) {
591 rcu_read_lock();
592 for_each_pmc_rcu(in_dev, pmc) {
593 if (pmc->multiaddr == IGMP_ALL_HOSTS)
594 continue;
595 if (ipv4_is_local_multicast(pmc->multiaddr) &&
596 !net->ipv4.sysctl_igmp_llm_reports)
597 continue;
598 spin_lock_bh(&pmc->lock);
599 if (pmc->sfcount[MCAST_EXCLUDE])
600 type = IGMPV3_MODE_IS_EXCLUDE;
601 else
602 type = IGMPV3_MODE_IS_INCLUDE;
603 skb = add_grec(skb, pmc, type, 0, 0);
604 spin_unlock_bh(&pmc->lock);
605 }
606 rcu_read_unlock();
607 } else {
608 spin_lock_bh(&pmc->lock);
609 if (pmc->sfcount[MCAST_EXCLUDE])
610 type = IGMPV3_MODE_IS_EXCLUDE;
611 else
612 type = IGMPV3_MODE_IS_INCLUDE;
613 skb = add_grec(skb, pmc, type, 0, 0);
614 spin_unlock_bh(&pmc->lock);
615 }
616 if (!skb)
617 return 0;
618 return igmpv3_sendpack(skb);
619}
620
621/*
622 * remove zero-count source records from a source filter list
623 */
624static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
625{
626 struct ip_sf_list *psf_prev, *psf_next, *psf;
627
628 psf_prev = NULL;
629 for (psf = *ppsf; psf; psf = psf_next) {
630 psf_next = psf->sf_next;
631 if (psf->sf_crcount == 0) {
632 if (psf_prev)
633 psf_prev->sf_next = psf->sf_next;
634 else
635 *ppsf = psf->sf_next;
636 kfree(psf);
637 } else
638 psf_prev = psf;
639 }
640}
641
642static void kfree_pmc(struct ip_mc_list *pmc)
643{
644 ip_sf_list_clear_all(pmc->sources);
645 ip_sf_list_clear_all(pmc->tomb);
646 kfree(pmc);
647}
648
649static void igmpv3_send_cr(struct in_device *in_dev)
650{
651 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
652 struct sk_buff *skb = NULL;
653 int type, dtype;
654
655 rcu_read_lock();
656 spin_lock_bh(&in_dev->mc_tomb_lock);
657
658 /* deleted MCA's */
659 pmc_prev = NULL;
660 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
661 pmc_next = pmc->next;
662 if (pmc->sfmode == MCAST_INCLUDE) {
663 type = IGMPV3_BLOCK_OLD_SOURCES;
664 dtype = IGMPV3_BLOCK_OLD_SOURCES;
665 skb = add_grec(skb, pmc, type, 1, 0);
666 skb = add_grec(skb, pmc, dtype, 1, 1);
667 }
668 if (pmc->crcount) {
669 if (pmc->sfmode == MCAST_EXCLUDE) {
670 type = IGMPV3_CHANGE_TO_INCLUDE;
671 skb = add_grec(skb, pmc, type, 1, 0);
672 }
673 pmc->crcount--;
674 if (pmc->crcount == 0) {
675 igmpv3_clear_zeros(&pmc->tomb);
676 igmpv3_clear_zeros(&pmc->sources);
677 }
678 }
679 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
680 if (pmc_prev)
681 pmc_prev->next = pmc_next;
682 else
683 in_dev->mc_tomb = pmc_next;
684 in_dev_put(pmc->interface);
685 kfree_pmc(pmc);
686 } else
687 pmc_prev = pmc;
688 }
689 spin_unlock_bh(&in_dev->mc_tomb_lock);
690
691 /* change recs */
692 for_each_pmc_rcu(in_dev, pmc) {
693 spin_lock_bh(&pmc->lock);
694 if (pmc->sfcount[MCAST_EXCLUDE]) {
695 type = IGMPV3_BLOCK_OLD_SOURCES;
696 dtype = IGMPV3_ALLOW_NEW_SOURCES;
697 } else {
698 type = IGMPV3_ALLOW_NEW_SOURCES;
699 dtype = IGMPV3_BLOCK_OLD_SOURCES;
700 }
701 skb = add_grec(skb, pmc, type, 0, 0);
702 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
703
704 /* filter mode changes */
705 if (pmc->crcount) {
706 if (pmc->sfmode == MCAST_EXCLUDE)
707 type = IGMPV3_CHANGE_TO_EXCLUDE;
708 else
709 type = IGMPV3_CHANGE_TO_INCLUDE;
710 skb = add_grec(skb, pmc, type, 0, 0);
711 pmc->crcount--;
712 }
713 spin_unlock_bh(&pmc->lock);
714 }
715 rcu_read_unlock();
716
717 if (!skb)
718 return;
719 (void) igmpv3_sendpack(skb);
720}
721
722static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
723 int type)
724{
725 struct sk_buff *skb;
726 struct iphdr *iph;
727 struct igmphdr *ih;
728 struct rtable *rt;
729 struct net_device *dev = in_dev->dev;
730 struct net *net = dev_net(dev);
731 __be32 group = pmc ? pmc->multiaddr : 0;
732 struct flowi4 fl4;
733 __be32 dst;
734 int hlen, tlen;
735
736 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
737 return igmpv3_send_report(in_dev, pmc);
738
739 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
740 return 0;
741
742 if (type == IGMP_HOST_LEAVE_MESSAGE)
743 dst = IGMP_ALL_ROUTER;
744 else
745 dst = group;
746
747 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
748 0, 0,
749 IPPROTO_IGMP, 0, dev->ifindex);
750 if (IS_ERR(rt))
751 return -1;
752
753 hlen = LL_RESERVED_SPACE(dev);
754 tlen = dev->needed_tailroom;
755 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
756 if (!skb) {
757 ip_rt_put(rt);
758 return -1;
759 }
760 skb->priority = TC_PRIO_CONTROL;
761
762 skb_dst_set(skb, &rt->dst);
763
764 skb_reserve(skb, hlen);
765
766 skb_reset_network_header(skb);
767 iph = ip_hdr(skb);
768 skb_put(skb, sizeof(struct iphdr) + 4);
769
770 iph->version = 4;
771 iph->ihl = (sizeof(struct iphdr)+4)>>2;
772 iph->tos = 0xc0;
773 iph->frag_off = htons(IP_DF);
774 iph->ttl = 1;
775 iph->daddr = dst;
776 iph->saddr = fl4.saddr;
777 iph->protocol = IPPROTO_IGMP;
778 ip_select_ident(net, skb, NULL);
779 ((u8 *)&iph[1])[0] = IPOPT_RA;
780 ((u8 *)&iph[1])[1] = 4;
781 ((u8 *)&iph[1])[2] = 0;
782 ((u8 *)&iph[1])[3] = 0;
783
784 ih = skb_put(skb, sizeof(struct igmphdr));
785 ih->type = type;
786 ih->code = 0;
787 ih->csum = 0;
788 ih->group = group;
789 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
790
791 return ip_local_out(net, skb->sk, skb);
792}
793
794static void igmp_gq_timer_expire(struct timer_list *t)
795{
796 struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer);
797
798 in_dev->mr_gq_running = 0;
799 igmpv3_send_report(in_dev, NULL);
800 in_dev_put(in_dev);
801}
802
803static void igmp_ifc_timer_expire(struct timer_list *t)
804{
805 struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer);
806 u32 mr_ifc_count;
807
808 igmpv3_send_cr(in_dev);
809restart:
810 mr_ifc_count = READ_ONCE(in_dev->mr_ifc_count);
811
812 if (mr_ifc_count) {
813 if (cmpxchg(&in_dev->mr_ifc_count,
814 mr_ifc_count,
815 mr_ifc_count - 1) != mr_ifc_count)
816 goto restart;
817 igmp_ifc_start_timer(in_dev,
818 unsolicited_report_interval(in_dev));
819 }
820 in_dev_put(in_dev);
821}
822
823static void igmp_ifc_event(struct in_device *in_dev)
824{
825 struct net *net = dev_net(in_dev->dev);
826 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
827 return;
828 WRITE_ONCE(in_dev->mr_ifc_count, in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv);
829 igmp_ifc_start_timer(in_dev, 1);
830}
831
832
833static void igmp_timer_expire(struct timer_list *t)
834{
835 struct ip_mc_list *im = from_timer(im, t, timer);
836 struct in_device *in_dev = im->interface;
837
838 spin_lock(&im->lock);
839 im->tm_running = 0;
840
841 if (im->unsolicit_count && --im->unsolicit_count)
842 igmp_start_timer(im, unsolicited_report_interval(in_dev));
843
844 im->reporter = 1;
845 spin_unlock(&im->lock);
846
847 if (IGMP_V1_SEEN(in_dev))
848 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
849 else if (IGMP_V2_SEEN(in_dev))
850 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
851 else
852 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
853
854 ip_ma_put(im);
855}
856
857/* mark EXCLUDE-mode sources */
858static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
859{
860 struct ip_sf_list *psf;
861 int i, scount;
862
863 scount = 0;
864 for (psf = pmc->sources; psf; psf = psf->sf_next) {
865 if (scount == nsrcs)
866 break;
867 for (i = 0; i < nsrcs; i++) {
868 /* skip inactive filters */
869 if (psf->sf_count[MCAST_INCLUDE] ||
870 pmc->sfcount[MCAST_EXCLUDE] !=
871 psf->sf_count[MCAST_EXCLUDE])
872 break;
873 if (srcs[i] == psf->sf_inaddr) {
874 scount++;
875 break;
876 }
877 }
878 }
879 pmc->gsquery = 0;
880 if (scount == nsrcs) /* all sources excluded */
881 return 0;
882 return 1;
883}
884
885static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
886{
887 struct ip_sf_list *psf;
888 int i, scount;
889
890 if (pmc->sfmode == MCAST_EXCLUDE)
891 return igmp_xmarksources(pmc, nsrcs, srcs);
892
893 /* mark INCLUDE-mode sources */
894 scount = 0;
895 for (psf = pmc->sources; psf; psf = psf->sf_next) {
896 if (scount == nsrcs)
897 break;
898 for (i = 0; i < nsrcs; i++)
899 if (srcs[i] == psf->sf_inaddr) {
900 psf->sf_gsresp = 1;
901 scount++;
902 break;
903 }
904 }
905 if (!scount) {
906 pmc->gsquery = 0;
907 return 0;
908 }
909 pmc->gsquery = 1;
910 return 1;
911}
912
913/* return true if packet was dropped */
914static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
915{
916 struct ip_mc_list *im;
917 struct net *net = dev_net(in_dev->dev);
918
919 /* Timers are only set for non-local groups */
920
921 if (group == IGMP_ALL_HOSTS)
922 return false;
923 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
924 return false;
925
926 rcu_read_lock();
927 for_each_pmc_rcu(in_dev, im) {
928 if (im->multiaddr == group) {
929 igmp_stop_timer(im);
930 break;
931 }
932 }
933 rcu_read_unlock();
934 return false;
935}
936
937/* return true if packet was dropped */
938static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
939 int len)
940{
941 struct igmphdr *ih = igmp_hdr(skb);
942 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
943 struct ip_mc_list *im;
944 __be32 group = ih->group;
945 int max_delay;
946 int mark = 0;
947 struct net *net = dev_net(in_dev->dev);
948
949
950 if (len == 8) {
951 if (ih->code == 0) {
952 /* Alas, old v1 router presents here. */
953
954 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
955 in_dev->mr_v1_seen = jiffies +
956 (in_dev->mr_qrv * in_dev->mr_qi) +
957 in_dev->mr_qri;
958 group = 0;
959 } else {
960 /* v2 router present */
961 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
962 in_dev->mr_v2_seen = jiffies +
963 (in_dev->mr_qrv * in_dev->mr_qi) +
964 in_dev->mr_qri;
965 }
966 /* cancel the interface change timer */
967 WRITE_ONCE(in_dev->mr_ifc_count, 0);
968 if (del_timer(&in_dev->mr_ifc_timer))
969 __in_dev_put(in_dev);
970 /* clear deleted report items */
971 igmpv3_clear_delrec(in_dev);
972 } else if (len < 12) {
973 return true; /* ignore bogus packet; freed by caller */
974 } else if (IGMP_V1_SEEN(in_dev)) {
975 /* This is a v3 query with v1 queriers present */
976 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
977 group = 0;
978 } else if (IGMP_V2_SEEN(in_dev)) {
979 /* this is a v3 query with v2 queriers present;
980 * Interpretation of the max_delay code is problematic here.
981 * A real v2 host would use ih_code directly, while v3 has a
982 * different encoding. We use the v3 encoding as more likely
983 * to be intended in a v3 query.
984 */
985 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
986 if (!max_delay)
987 max_delay = 1; /* can't mod w/ 0 */
988 } else { /* v3 */
989 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
990 return true;
991
992 ih3 = igmpv3_query_hdr(skb);
993 if (ih3->nsrcs) {
994 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
995 + ntohs(ih3->nsrcs)*sizeof(__be32)))
996 return true;
997 ih3 = igmpv3_query_hdr(skb);
998 }
999
1000 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
1001 if (!max_delay)
1002 max_delay = 1; /* can't mod w/ 0 */
1003 in_dev->mr_maxdelay = max_delay;
1004
1005 /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently
1006 * received value was zero, use the default or statically
1007 * configured value.
1008 */
1009 in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv;
1010 in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL;
1011
1012 /* RFC3376, 8.3. Query Response Interval:
1013 * The number of seconds represented by the [Query Response
1014 * Interval] must be less than the [Query Interval].
1015 */
1016 if (in_dev->mr_qri >= in_dev->mr_qi)
1017 in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ;
1018
1019 if (!group) { /* general query */
1020 if (ih3->nsrcs)
1021 return true; /* no sources allowed */
1022 igmp_gq_start_timer(in_dev);
1023 return false;
1024 }
1025 /* mark sources to include, if group & source-specific */
1026 mark = ih3->nsrcs != 0;
1027 }
1028
1029 /*
1030 * - Start the timers in all of our membership records
1031 * that the query applies to for the interface on
1032 * which the query arrived excl. those that belong
1033 * to a "local" group (224.0.0.X)
1034 * - For timers already running check if they need to
1035 * be reset.
1036 * - Use the igmp->igmp_code field as the maximum
1037 * delay possible
1038 */
1039 rcu_read_lock();
1040 for_each_pmc_rcu(in_dev, im) {
1041 int changed;
1042
1043 if (group && group != im->multiaddr)
1044 continue;
1045 if (im->multiaddr == IGMP_ALL_HOSTS)
1046 continue;
1047 if (ipv4_is_local_multicast(im->multiaddr) &&
1048 !net->ipv4.sysctl_igmp_llm_reports)
1049 continue;
1050 spin_lock_bh(&im->lock);
1051 if (im->tm_running)
1052 im->gsquery = im->gsquery && mark;
1053 else
1054 im->gsquery = mark;
1055 changed = !im->gsquery ||
1056 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1057 spin_unlock_bh(&im->lock);
1058 if (changed)
1059 igmp_mod_timer(im, max_delay);
1060 }
1061 rcu_read_unlock();
1062 return false;
1063}
1064
1065/* called in rcu_read_lock() section */
1066int igmp_rcv(struct sk_buff *skb)
1067{
1068 /* This basically follows the spec line by line -- see RFC1112 */
1069 struct igmphdr *ih;
1070 struct net_device *dev = skb->dev;
1071 struct in_device *in_dev;
1072 int len = skb->len;
1073 bool dropped = true;
1074
1075 if (netif_is_l3_master(dev)) {
1076 dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif);
1077 if (!dev)
1078 goto drop;
1079 }
1080
1081 in_dev = __in_dev_get_rcu(dev);
1082 if (!in_dev)
1083 goto drop;
1084
1085 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1086 goto drop;
1087
1088 if (skb_checksum_simple_validate(skb))
1089 goto drop;
1090
1091 ih = igmp_hdr(skb);
1092 switch (ih->type) {
1093 case IGMP_HOST_MEMBERSHIP_QUERY:
1094 dropped = igmp_heard_query(in_dev, skb, len);
1095 break;
1096 case IGMP_HOST_MEMBERSHIP_REPORT:
1097 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1098 /* Is it our report looped back? */
1099 if (rt_is_output_route(skb_rtable(skb)))
1100 break;
1101 /* don't rely on MC router hearing unicast reports */
1102 if (skb->pkt_type == PACKET_MULTICAST ||
1103 skb->pkt_type == PACKET_BROADCAST)
1104 dropped = igmp_heard_report(in_dev, ih->group);
1105 break;
1106 case IGMP_PIM:
1107#ifdef CONFIG_IP_PIMSM_V1
1108 return pim_rcv_v1(skb);
1109#endif
1110 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1111 case IGMP_DVMRP:
1112 case IGMP_TRACE:
1113 case IGMP_HOST_LEAVE_MESSAGE:
1114 case IGMP_MTRACE:
1115 case IGMP_MTRACE_RESP:
1116 break;
1117 default:
1118 break;
1119 }
1120
1121drop:
1122 if (dropped)
1123 kfree_skb(skb);
1124 else
1125 consume_skb(skb);
1126 return 0;
1127}
1128
1129#endif
1130
1131
1132/*
1133 * Add a filter to a device
1134 */
1135
1136static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1137{
1138 char buf[MAX_ADDR_LEN];
1139 struct net_device *dev = in_dev->dev;
1140
1141 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1142 We will get multicast token leakage, when IFF_MULTICAST
1143 is changed. This check should be done in ndo_set_rx_mode
1144 routine. Something sort of:
1145 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1146 --ANK
1147 */
1148 if (arp_mc_map(addr, buf, dev, 0) == 0)
1149 dev_mc_add(dev, buf);
1150}
1151
1152/*
1153 * Remove a filter from a device
1154 */
1155
1156static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1157{
1158 char buf[MAX_ADDR_LEN];
1159 struct net_device *dev = in_dev->dev;
1160
1161 if (arp_mc_map(addr, buf, dev, 0) == 0)
1162 dev_mc_del(dev, buf);
1163}
1164
1165#ifdef CONFIG_IP_MULTICAST
1166/*
1167 * deleted ip_mc_list manipulation
1168 */
1169static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
1170 gfp_t gfp)
1171{
1172 struct ip_mc_list *pmc;
1173 struct net *net = dev_net(in_dev->dev);
1174
1175 /* this is an "ip_mc_list" for convenience; only the fields below
1176 * are actually used. In particular, the refcnt and users are not
1177 * used for management of the delete list. Using the same structure
1178 * for deleted items allows change reports to use common code with
1179 * non-deleted or query-response MCA's.
1180 */
1181 pmc = kzalloc(sizeof(*pmc), gfp);
1182 if (!pmc)
1183 return;
1184 spin_lock_init(&pmc->lock);
1185 spin_lock_bh(&im->lock);
1186 pmc->interface = im->interface;
1187 in_dev_hold(in_dev);
1188 pmc->multiaddr = im->multiaddr;
1189 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1190 pmc->sfmode = im->sfmode;
1191 if (pmc->sfmode == MCAST_INCLUDE) {
1192 struct ip_sf_list *psf;
1193
1194 pmc->tomb = im->tomb;
1195 pmc->sources = im->sources;
1196 im->tomb = im->sources = NULL;
1197 for (psf = pmc->sources; psf; psf = psf->sf_next)
1198 psf->sf_crcount = pmc->crcount;
1199 }
1200 spin_unlock_bh(&im->lock);
1201
1202 spin_lock_bh(&in_dev->mc_tomb_lock);
1203 pmc->next = in_dev->mc_tomb;
1204 in_dev->mc_tomb = pmc;
1205 spin_unlock_bh(&in_dev->mc_tomb_lock);
1206}
1207
1208/*
1209 * restore ip_mc_list deleted records
1210 */
1211static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1212{
1213 struct ip_mc_list *pmc, *pmc_prev;
1214 struct ip_sf_list *psf;
1215 struct net *net = dev_net(in_dev->dev);
1216 __be32 multiaddr = im->multiaddr;
1217
1218 spin_lock_bh(&in_dev->mc_tomb_lock);
1219 pmc_prev = NULL;
1220 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1221 if (pmc->multiaddr == multiaddr)
1222 break;
1223 pmc_prev = pmc;
1224 }
1225 if (pmc) {
1226 if (pmc_prev)
1227 pmc_prev->next = pmc->next;
1228 else
1229 in_dev->mc_tomb = pmc->next;
1230 }
1231 spin_unlock_bh(&in_dev->mc_tomb_lock);
1232
1233 spin_lock_bh(&im->lock);
1234 if (pmc) {
1235 im->interface = pmc->interface;
1236 if (im->sfmode == MCAST_INCLUDE) {
1237 swap(im->tomb, pmc->tomb);
1238 swap(im->sources, pmc->sources);
1239 for (psf = im->sources; psf; psf = psf->sf_next)
1240 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1241 } else {
1242 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1243 }
1244 in_dev_put(pmc->interface);
1245 kfree_pmc(pmc);
1246 }
1247 spin_unlock_bh(&im->lock);
1248}
1249
1250/*
1251 * flush ip_mc_list deleted records
1252 */
1253static void igmpv3_clear_delrec(struct in_device *in_dev)
1254{
1255 struct ip_mc_list *pmc, *nextpmc;
1256
1257 spin_lock_bh(&in_dev->mc_tomb_lock);
1258 pmc = in_dev->mc_tomb;
1259 in_dev->mc_tomb = NULL;
1260 spin_unlock_bh(&in_dev->mc_tomb_lock);
1261
1262 for (; pmc; pmc = nextpmc) {
1263 nextpmc = pmc->next;
1264 ip_mc_clear_src(pmc);
1265 in_dev_put(pmc->interface);
1266 kfree_pmc(pmc);
1267 }
1268 /* clear dead sources, too */
1269 rcu_read_lock();
1270 for_each_pmc_rcu(in_dev, pmc) {
1271 struct ip_sf_list *psf;
1272
1273 spin_lock_bh(&pmc->lock);
1274 psf = pmc->tomb;
1275 pmc->tomb = NULL;
1276 spin_unlock_bh(&pmc->lock);
1277 ip_sf_list_clear_all(psf);
1278 }
1279 rcu_read_unlock();
1280}
1281#endif
1282
1283static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp)
1284{
1285 struct in_device *in_dev = im->interface;
1286#ifdef CONFIG_IP_MULTICAST
1287 struct net *net = dev_net(in_dev->dev);
1288 int reporter;
1289#endif
1290
1291 if (im->loaded) {
1292 im->loaded = 0;
1293 ip_mc_filter_del(in_dev, im->multiaddr);
1294 }
1295
1296#ifdef CONFIG_IP_MULTICAST
1297 if (im->multiaddr == IGMP_ALL_HOSTS)
1298 return;
1299 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1300 return;
1301
1302 reporter = im->reporter;
1303 igmp_stop_timer(im);
1304
1305 if (!in_dev->dead) {
1306 if (IGMP_V1_SEEN(in_dev))
1307 return;
1308 if (IGMP_V2_SEEN(in_dev)) {
1309 if (reporter)
1310 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1311 return;
1312 }
1313 /* IGMPv3 */
1314 igmpv3_add_delrec(in_dev, im, gfp);
1315
1316 igmp_ifc_event(in_dev);
1317 }
1318#endif
1319}
1320
1321static void igmp_group_dropped(struct ip_mc_list *im)
1322{
1323 __igmp_group_dropped(im, GFP_KERNEL);
1324}
1325
1326static void igmp_group_added(struct ip_mc_list *im)
1327{
1328 struct in_device *in_dev = im->interface;
1329#ifdef CONFIG_IP_MULTICAST
1330 struct net *net = dev_net(in_dev->dev);
1331#endif
1332
1333 if (im->loaded == 0) {
1334 im->loaded = 1;
1335 ip_mc_filter_add(in_dev, im->multiaddr);
1336 }
1337
1338#ifdef CONFIG_IP_MULTICAST
1339 if (im->multiaddr == IGMP_ALL_HOSTS)
1340 return;
1341 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1342 return;
1343
1344 if (in_dev->dead)
1345 return;
1346
1347 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1348 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1349 spin_lock_bh(&im->lock);
1350 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1351 spin_unlock_bh(&im->lock);
1352 return;
1353 }
1354 /* else, v3 */
1355
1356 /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should
1357 * not send filter-mode change record as the mode should be from
1358 * IN() to IN(A).
1359 */
1360 if (im->sfmode == MCAST_EXCLUDE)
1361 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1362
1363 igmp_ifc_event(in_dev);
1364#endif
1365}
1366
1367
1368/*
1369 * Multicast list managers
1370 */
1371
1372static u32 ip_mc_hash(const struct ip_mc_list *im)
1373{
1374 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1375}
1376
1377static void ip_mc_hash_add(struct in_device *in_dev,
1378 struct ip_mc_list *im)
1379{
1380 struct ip_mc_list __rcu **mc_hash;
1381 u32 hash;
1382
1383 mc_hash = rtnl_dereference(in_dev->mc_hash);
1384 if (mc_hash) {
1385 hash = ip_mc_hash(im);
1386 im->next_hash = mc_hash[hash];
1387 rcu_assign_pointer(mc_hash[hash], im);
1388 return;
1389 }
1390
1391 /* do not use a hash table for small number of items */
1392 if (in_dev->mc_count < 4)
1393 return;
1394
1395 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1396 GFP_KERNEL);
1397 if (!mc_hash)
1398 return;
1399
1400 for_each_pmc_rtnl(in_dev, im) {
1401 hash = ip_mc_hash(im);
1402 im->next_hash = mc_hash[hash];
1403 RCU_INIT_POINTER(mc_hash[hash], im);
1404 }
1405
1406 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1407}
1408
1409static void ip_mc_hash_remove(struct in_device *in_dev,
1410 struct ip_mc_list *im)
1411{
1412 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1413 struct ip_mc_list *aux;
1414
1415 if (!mc_hash)
1416 return;
1417 mc_hash += ip_mc_hash(im);
1418 while ((aux = rtnl_dereference(*mc_hash)) != im)
1419 mc_hash = &aux->next_hash;
1420 *mc_hash = im->next_hash;
1421}
1422
1423
1424/*
1425 * A socket has joined a multicast group on device dev.
1426 */
1427static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr,
1428 unsigned int mode, gfp_t gfp)
1429{
1430 struct ip_mc_list *im;
1431
1432 ASSERT_RTNL();
1433
1434 for_each_pmc_rtnl(in_dev, im) {
1435 if (im->multiaddr == addr) {
1436 im->users++;
1437 ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0);
1438 goto out;
1439 }
1440 }
1441
1442 im = kzalloc(sizeof(*im), gfp);
1443 if (!im)
1444 goto out;
1445
1446 im->users = 1;
1447 im->interface = in_dev;
1448 in_dev_hold(in_dev);
1449 im->multiaddr = addr;
1450 /* initial mode is (EX, empty) */
1451 im->sfmode = mode;
1452 im->sfcount[mode] = 1;
1453 refcount_set(&im->refcnt, 1);
1454 spin_lock_init(&im->lock);
1455#ifdef CONFIG_IP_MULTICAST
1456 timer_setup(&im->timer, igmp_timer_expire, 0);
1457#endif
1458
1459 im->next_rcu = in_dev->mc_list;
1460 in_dev->mc_count++;
1461 rcu_assign_pointer(in_dev->mc_list, im);
1462
1463 ip_mc_hash_add(in_dev, im);
1464
1465#ifdef CONFIG_IP_MULTICAST
1466 igmpv3_del_delrec(in_dev, im);
1467#endif
1468 igmp_group_added(im);
1469 if (!in_dev->dead)
1470 ip_rt_multicast_event(in_dev);
1471out:
1472 return;
1473}
1474
1475void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
1476{
1477 ____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp);
1478}
1479EXPORT_SYMBOL(__ip_mc_inc_group);
1480
1481void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1482{
1483 __ip_mc_inc_group(in_dev, addr, GFP_KERNEL);
1484}
1485EXPORT_SYMBOL(ip_mc_inc_group);
1486
1487static int ip_mc_check_iphdr(struct sk_buff *skb)
1488{
1489 const struct iphdr *iph;
1490 unsigned int len;
1491 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1492
1493 if (!pskb_may_pull(skb, offset))
1494 return -EINVAL;
1495
1496 iph = ip_hdr(skb);
1497
1498 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1499 return -EINVAL;
1500
1501 offset += ip_hdrlen(skb) - sizeof(*iph);
1502
1503 if (!pskb_may_pull(skb, offset))
1504 return -EINVAL;
1505
1506 iph = ip_hdr(skb);
1507
1508 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1509 return -EINVAL;
1510
1511 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1512 if (skb->len < len || len < offset)
1513 return -EINVAL;
1514
1515 skb_set_transport_header(skb, offset);
1516
1517 return 0;
1518}
1519
1520static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1521{
1522 unsigned int len = skb_transport_offset(skb);
1523
1524 len += sizeof(struct igmpv3_report);
1525
1526 return ip_mc_may_pull(skb, len) ? 0 : -EINVAL;
1527}
1528
1529static int ip_mc_check_igmp_query(struct sk_buff *skb)
1530{
1531 unsigned int transport_len = ip_transport_len(skb);
1532 unsigned int len;
1533
1534 /* IGMPv{1,2}? */
1535 if (transport_len != sizeof(struct igmphdr)) {
1536 /* or IGMPv3? */
1537 if (transport_len < sizeof(struct igmpv3_query))
1538 return -EINVAL;
1539
1540 len = skb_transport_offset(skb) + sizeof(struct igmpv3_query);
1541 if (!ip_mc_may_pull(skb, len))
1542 return -EINVAL;
1543 }
1544
1545 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1546 * all-systems destination addresses (224.0.0.1) for general queries
1547 */
1548 if (!igmp_hdr(skb)->group &&
1549 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1550 return -EINVAL;
1551
1552 return 0;
1553}
1554
1555static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1556{
1557 switch (igmp_hdr(skb)->type) {
1558 case IGMP_HOST_LEAVE_MESSAGE:
1559 case IGMP_HOST_MEMBERSHIP_REPORT:
1560 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1561 return 0;
1562 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1563 return ip_mc_check_igmp_reportv3(skb);
1564 case IGMP_HOST_MEMBERSHIP_QUERY:
1565 return ip_mc_check_igmp_query(skb);
1566 default:
1567 return -ENOMSG;
1568 }
1569}
1570
1571static __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1572{
1573 return skb_checksum_simple_validate(skb);
1574}
1575
1576static int ip_mc_check_igmp_csum(struct sk_buff *skb)
1577{
1578 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1579 unsigned int transport_len = ip_transport_len(skb);
1580 struct sk_buff *skb_chk;
1581
1582 if (!ip_mc_may_pull(skb, len))
1583 return -EINVAL;
1584
1585 skb_chk = skb_checksum_trimmed(skb, transport_len,
1586 ip_mc_validate_checksum);
1587 if (!skb_chk)
1588 return -EINVAL;
1589
1590 if (skb_chk != skb)
1591 kfree_skb(skb_chk);
1592
1593 return 0;
1594}
1595
1596/**
1597 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1598 * @skb: the skb to validate
1599 *
1600 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1601 * skb transport header accordingly and returns zero.
1602 *
1603 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1604 * standard
1605 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1606 * -ENOMEM: A memory allocation failure happened.
1607 *
1608 * Caller needs to set the skb network header and free any returned skb if it
1609 * differs from the provided skb.
1610 */
1611int ip_mc_check_igmp(struct sk_buff *skb)
1612{
1613 int ret = ip_mc_check_iphdr(skb);
1614
1615 if (ret < 0)
1616 return ret;
1617
1618 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1619 return -ENOMSG;
1620
1621 ret = ip_mc_check_igmp_csum(skb);
1622 if (ret < 0)
1623 return ret;
1624
1625 return ip_mc_check_igmp_msg(skb);
1626}
1627EXPORT_SYMBOL(ip_mc_check_igmp);
1628
1629/*
1630 * Resend IGMP JOIN report; used by netdev notifier.
1631 */
1632static void ip_mc_rejoin_groups(struct in_device *in_dev)
1633{
1634#ifdef CONFIG_IP_MULTICAST
1635 struct ip_mc_list *im;
1636 int type;
1637 struct net *net = dev_net(in_dev->dev);
1638
1639 ASSERT_RTNL();
1640
1641 for_each_pmc_rtnl(in_dev, im) {
1642 if (im->multiaddr == IGMP_ALL_HOSTS)
1643 continue;
1644 if (ipv4_is_local_multicast(im->multiaddr) &&
1645 !net->ipv4.sysctl_igmp_llm_reports)
1646 continue;
1647
1648 /* a failover is happening and switches
1649 * must be notified immediately
1650 */
1651 if (IGMP_V1_SEEN(in_dev))
1652 type = IGMP_HOST_MEMBERSHIP_REPORT;
1653 else if (IGMP_V2_SEEN(in_dev))
1654 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1655 else
1656 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1657 igmp_send_report(in_dev, im, type);
1658 }
1659#endif
1660}
1661
1662/*
1663 * A socket has left a multicast group on device dev
1664 */
1665
1666void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
1667{
1668 struct ip_mc_list *i;
1669 struct ip_mc_list __rcu **ip;
1670
1671 ASSERT_RTNL();
1672
1673 for (ip = &in_dev->mc_list;
1674 (i = rtnl_dereference(*ip)) != NULL;
1675 ip = &i->next_rcu) {
1676 if (i->multiaddr == addr) {
1677 if (--i->users == 0) {
1678 ip_mc_hash_remove(in_dev, i);
1679 *ip = i->next_rcu;
1680 in_dev->mc_count--;
1681 __igmp_group_dropped(i, gfp);
1682 ip_mc_clear_src(i);
1683
1684 if (!in_dev->dead)
1685 ip_rt_multicast_event(in_dev);
1686
1687 ip_ma_put(i);
1688 return;
1689 }
1690 break;
1691 }
1692 }
1693}
1694EXPORT_SYMBOL(__ip_mc_dec_group);
1695
1696/* Device changing type */
1697
1698void ip_mc_unmap(struct in_device *in_dev)
1699{
1700 struct ip_mc_list *pmc;
1701
1702 ASSERT_RTNL();
1703
1704 for_each_pmc_rtnl(in_dev, pmc)
1705 igmp_group_dropped(pmc);
1706}
1707
1708void ip_mc_remap(struct in_device *in_dev)
1709{
1710 struct ip_mc_list *pmc;
1711
1712 ASSERT_RTNL();
1713
1714 for_each_pmc_rtnl(in_dev, pmc) {
1715#ifdef CONFIG_IP_MULTICAST
1716 igmpv3_del_delrec(in_dev, pmc);
1717#endif
1718 igmp_group_added(pmc);
1719 }
1720}
1721
1722/* Device going down */
1723
1724void ip_mc_down(struct in_device *in_dev)
1725{
1726 struct ip_mc_list *pmc;
1727
1728 ASSERT_RTNL();
1729
1730 for_each_pmc_rtnl(in_dev, pmc)
1731 igmp_group_dropped(pmc);
1732
1733#ifdef CONFIG_IP_MULTICAST
1734 WRITE_ONCE(in_dev->mr_ifc_count, 0);
1735 if (del_timer(&in_dev->mr_ifc_timer))
1736 __in_dev_put(in_dev);
1737 in_dev->mr_gq_running = 0;
1738 if (del_timer(&in_dev->mr_gq_timer))
1739 __in_dev_put(in_dev);
1740#endif
1741
1742 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1743}
1744
1745#ifdef CONFIG_IP_MULTICAST
1746static void ip_mc_reset(struct in_device *in_dev)
1747{
1748 struct net *net = dev_net(in_dev->dev);
1749
1750 in_dev->mr_qi = IGMP_QUERY_INTERVAL;
1751 in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL;
1752 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1753}
1754#else
1755static void ip_mc_reset(struct in_device *in_dev)
1756{
1757}
1758#endif
1759
1760void ip_mc_init_dev(struct in_device *in_dev)
1761{
1762 ASSERT_RTNL();
1763
1764#ifdef CONFIG_IP_MULTICAST
1765 timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0);
1766 timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0);
1767#endif
1768 ip_mc_reset(in_dev);
1769
1770 spin_lock_init(&in_dev->mc_tomb_lock);
1771}
1772
1773/* Device going up */
1774
1775void ip_mc_up(struct in_device *in_dev)
1776{
1777 struct ip_mc_list *pmc;
1778
1779 ASSERT_RTNL();
1780
1781 ip_mc_reset(in_dev);
1782 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1783
1784 for_each_pmc_rtnl(in_dev, pmc) {
1785#ifdef CONFIG_IP_MULTICAST
1786 igmpv3_del_delrec(in_dev, pmc);
1787#endif
1788 igmp_group_added(pmc);
1789 }
1790}
1791
1792/*
1793 * Device is about to be destroyed: clean up.
1794 */
1795
1796void ip_mc_destroy_dev(struct in_device *in_dev)
1797{
1798 struct ip_mc_list *i;
1799
1800 ASSERT_RTNL();
1801
1802 /* Deactivate timers */
1803 ip_mc_down(in_dev);
1804#ifdef CONFIG_IP_MULTICAST
1805 igmpv3_clear_delrec(in_dev);
1806#endif
1807
1808 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1809 in_dev->mc_list = i->next_rcu;
1810 in_dev->mc_count--;
1811 ip_mc_clear_src(i);
1812 ip_ma_put(i);
1813 }
1814}
1815
1816/* RTNL is locked */
1817static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1818{
1819 struct net_device *dev = NULL;
1820 struct in_device *idev = NULL;
1821
1822 if (imr->imr_ifindex) {
1823 idev = inetdev_by_index(net, imr->imr_ifindex);
1824 return idev;
1825 }
1826 if (imr->imr_address.s_addr) {
1827 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1828 if (!dev)
1829 return NULL;
1830 }
1831
1832 if (!dev) {
1833 struct rtable *rt = ip_route_output(net,
1834 imr->imr_multiaddr.s_addr,
1835 0, 0, 0);
1836 if (!IS_ERR(rt)) {
1837 dev = rt->dst.dev;
1838 ip_rt_put(rt);
1839 }
1840 }
1841 if (dev) {
1842 imr->imr_ifindex = dev->ifindex;
1843 idev = __in_dev_get_rtnl(dev);
1844 }
1845 return idev;
1846}
1847
1848/*
1849 * Join a socket to a group
1850 */
1851
1852static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1853 __be32 *psfsrc)
1854{
1855 struct ip_sf_list *psf, *psf_prev;
1856 int rv = 0;
1857
1858 psf_prev = NULL;
1859 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1860 if (psf->sf_inaddr == *psfsrc)
1861 break;
1862 psf_prev = psf;
1863 }
1864 if (!psf || psf->sf_count[sfmode] == 0) {
1865 /* source filter not found, or count wrong => bug */
1866 return -ESRCH;
1867 }
1868 psf->sf_count[sfmode]--;
1869 if (psf->sf_count[sfmode] == 0) {
1870 ip_rt_multicast_event(pmc->interface);
1871 }
1872 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1873#ifdef CONFIG_IP_MULTICAST
1874 struct in_device *in_dev = pmc->interface;
1875 struct net *net = dev_net(in_dev->dev);
1876#endif
1877
1878 /* no more filters for this source */
1879 if (psf_prev)
1880 psf_prev->sf_next = psf->sf_next;
1881 else
1882 pmc->sources = psf->sf_next;
1883#ifdef CONFIG_IP_MULTICAST
1884 if (psf->sf_oldin &&
1885 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1886 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1887 psf->sf_next = pmc->tomb;
1888 pmc->tomb = psf;
1889 rv = 1;
1890 } else
1891#endif
1892 kfree(psf);
1893 }
1894 return rv;
1895}
1896
1897#ifndef CONFIG_IP_MULTICAST
1898#define igmp_ifc_event(x) do { } while (0)
1899#endif
1900
1901static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1902 int sfcount, __be32 *psfsrc, int delta)
1903{
1904 struct ip_mc_list *pmc;
1905 int changerec = 0;
1906 int i, err;
1907
1908 if (!in_dev)
1909 return -ENODEV;
1910 rcu_read_lock();
1911 for_each_pmc_rcu(in_dev, pmc) {
1912 if (*pmca == pmc->multiaddr)
1913 break;
1914 }
1915 if (!pmc) {
1916 /* MCA not found?? bug */
1917 rcu_read_unlock();
1918 return -ESRCH;
1919 }
1920 spin_lock_bh(&pmc->lock);
1921 rcu_read_unlock();
1922#ifdef CONFIG_IP_MULTICAST
1923 sf_markstate(pmc);
1924#endif
1925 if (!delta) {
1926 err = -EINVAL;
1927 if (!pmc->sfcount[sfmode])
1928 goto out_unlock;
1929 pmc->sfcount[sfmode]--;
1930 }
1931 err = 0;
1932 for (i = 0; i < sfcount; i++) {
1933 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1934
1935 changerec |= rv > 0;
1936 if (!err && rv < 0)
1937 err = rv;
1938 }
1939 if (pmc->sfmode == MCAST_EXCLUDE &&
1940 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1941 pmc->sfcount[MCAST_INCLUDE]) {
1942#ifdef CONFIG_IP_MULTICAST
1943 struct ip_sf_list *psf;
1944 struct net *net = dev_net(in_dev->dev);
1945#endif
1946
1947 /* filter mode change */
1948 pmc->sfmode = MCAST_INCLUDE;
1949#ifdef CONFIG_IP_MULTICAST
1950 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1951 WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount);
1952 for (psf = pmc->sources; psf; psf = psf->sf_next)
1953 psf->sf_crcount = 0;
1954 igmp_ifc_event(pmc->interface);
1955 } else if (sf_setstate(pmc) || changerec) {
1956 igmp_ifc_event(pmc->interface);
1957#endif
1958 }
1959out_unlock:
1960 spin_unlock_bh(&pmc->lock);
1961 return err;
1962}
1963
1964/*
1965 * Add multicast single-source filter to the interface list
1966 */
1967static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1968 __be32 *psfsrc)
1969{
1970 struct ip_sf_list *psf, *psf_prev;
1971
1972 psf_prev = NULL;
1973 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1974 if (psf->sf_inaddr == *psfsrc)
1975 break;
1976 psf_prev = psf;
1977 }
1978 if (!psf) {
1979 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1980 if (!psf)
1981 return -ENOBUFS;
1982 psf->sf_inaddr = *psfsrc;
1983 if (psf_prev) {
1984 psf_prev->sf_next = psf;
1985 } else
1986 pmc->sources = psf;
1987 }
1988 psf->sf_count[sfmode]++;
1989 if (psf->sf_count[sfmode] == 1) {
1990 ip_rt_multicast_event(pmc->interface);
1991 }
1992 return 0;
1993}
1994
1995#ifdef CONFIG_IP_MULTICAST
1996static void sf_markstate(struct ip_mc_list *pmc)
1997{
1998 struct ip_sf_list *psf;
1999 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
2000
2001 for (psf = pmc->sources; psf; psf = psf->sf_next)
2002 if (pmc->sfcount[MCAST_EXCLUDE]) {
2003 psf->sf_oldin = mca_xcount ==
2004 psf->sf_count[MCAST_EXCLUDE] &&
2005 !psf->sf_count[MCAST_INCLUDE];
2006 } else
2007 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2008}
2009
2010static int sf_setstate(struct ip_mc_list *pmc)
2011{
2012 struct ip_sf_list *psf, *dpsf;
2013 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
2014 int qrv = pmc->interface->mr_qrv;
2015 int new_in, rv;
2016
2017 rv = 0;
2018 for (psf = pmc->sources; psf; psf = psf->sf_next) {
2019 if (pmc->sfcount[MCAST_EXCLUDE]) {
2020 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2021 !psf->sf_count[MCAST_INCLUDE];
2022 } else
2023 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2024 if (new_in) {
2025 if (!psf->sf_oldin) {
2026 struct ip_sf_list *prev = NULL;
2027
2028 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
2029 if (dpsf->sf_inaddr == psf->sf_inaddr)
2030 break;
2031 prev = dpsf;
2032 }
2033 if (dpsf) {
2034 if (prev)
2035 prev->sf_next = dpsf->sf_next;
2036 else
2037 pmc->tomb = dpsf->sf_next;
2038 kfree(dpsf);
2039 }
2040 psf->sf_crcount = qrv;
2041 rv++;
2042 }
2043 } else if (psf->sf_oldin) {
2044
2045 psf->sf_crcount = 0;
2046 /*
2047 * add or update "delete" records if an active filter
2048 * is now inactive
2049 */
2050 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
2051 if (dpsf->sf_inaddr == psf->sf_inaddr)
2052 break;
2053 if (!dpsf) {
2054 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2055 if (!dpsf)
2056 continue;
2057 *dpsf = *psf;
2058 /* pmc->lock held by callers */
2059 dpsf->sf_next = pmc->tomb;
2060 pmc->tomb = dpsf;
2061 }
2062 dpsf->sf_crcount = qrv;
2063 rv++;
2064 }
2065 }
2066 return rv;
2067}
2068#endif
2069
2070/*
2071 * Add multicast source filter list to the interface list
2072 */
2073static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2074 int sfcount, __be32 *psfsrc, int delta)
2075{
2076 struct ip_mc_list *pmc;
2077 int isexclude;
2078 int i, err;
2079
2080 if (!in_dev)
2081 return -ENODEV;
2082 rcu_read_lock();
2083 for_each_pmc_rcu(in_dev, pmc) {
2084 if (*pmca == pmc->multiaddr)
2085 break;
2086 }
2087 if (!pmc) {
2088 /* MCA not found?? bug */
2089 rcu_read_unlock();
2090 return -ESRCH;
2091 }
2092 spin_lock_bh(&pmc->lock);
2093 rcu_read_unlock();
2094
2095#ifdef CONFIG_IP_MULTICAST
2096 sf_markstate(pmc);
2097#endif
2098 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2099 if (!delta)
2100 pmc->sfcount[sfmode]++;
2101 err = 0;
2102 for (i = 0; i < sfcount; i++) {
2103 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2104 if (err)
2105 break;
2106 }
2107 if (err) {
2108 int j;
2109
2110 if (!delta)
2111 pmc->sfcount[sfmode]--;
2112 for (j = 0; j < i; j++)
2113 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2114 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2115#ifdef CONFIG_IP_MULTICAST
2116 struct ip_sf_list *psf;
2117 struct net *net = dev_net(pmc->interface->dev);
2118 in_dev = pmc->interface;
2119#endif
2120
2121 /* filter mode change */
2122 if (pmc->sfcount[MCAST_EXCLUDE])
2123 pmc->sfmode = MCAST_EXCLUDE;
2124 else if (pmc->sfcount[MCAST_INCLUDE])
2125 pmc->sfmode = MCAST_INCLUDE;
2126#ifdef CONFIG_IP_MULTICAST
2127 /* else no filters; keep old mode for reports */
2128
2129 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2130 WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount);
2131 for (psf = pmc->sources; psf; psf = psf->sf_next)
2132 psf->sf_crcount = 0;
2133 igmp_ifc_event(in_dev);
2134 } else if (sf_setstate(pmc)) {
2135 igmp_ifc_event(in_dev);
2136#endif
2137 }
2138 spin_unlock_bh(&pmc->lock);
2139 return err;
2140}
2141
2142static void ip_mc_clear_src(struct ip_mc_list *pmc)
2143{
2144 struct ip_sf_list *tomb, *sources;
2145
2146 spin_lock_bh(&pmc->lock);
2147 tomb = pmc->tomb;
2148 pmc->tomb = NULL;
2149 sources = pmc->sources;
2150 pmc->sources = NULL;
2151 pmc->sfmode = MCAST_EXCLUDE;
2152 pmc->sfcount[MCAST_INCLUDE] = 0;
2153 pmc->sfcount[MCAST_EXCLUDE] = 1;
2154 spin_unlock_bh(&pmc->lock);
2155
2156 ip_sf_list_clear_all(tomb);
2157 ip_sf_list_clear_all(sources);
2158}
2159
2160/* Join a multicast group
2161 */
2162static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr,
2163 unsigned int mode)
2164{
2165 __be32 addr = imr->imr_multiaddr.s_addr;
2166 struct ip_mc_socklist *iml, *i;
2167 struct in_device *in_dev;
2168 struct inet_sock *inet = inet_sk(sk);
2169 struct net *net = sock_net(sk);
2170 int ifindex;
2171 int count = 0;
2172 int err;
2173
2174 ASSERT_RTNL();
2175
2176 if (!ipv4_is_multicast(addr))
2177 return -EINVAL;
2178
2179 in_dev = ip_mc_find_dev(net, imr);
2180
2181 if (!in_dev) {
2182 err = -ENODEV;
2183 goto done;
2184 }
2185
2186 err = -EADDRINUSE;
2187 ifindex = imr->imr_ifindex;
2188 for_each_pmc_rtnl(inet, i) {
2189 if (i->multi.imr_multiaddr.s_addr == addr &&
2190 i->multi.imr_ifindex == ifindex)
2191 goto done;
2192 count++;
2193 }
2194 err = -ENOBUFS;
2195 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2196 goto done;
2197 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2198 if (!iml)
2199 goto done;
2200
2201 memcpy(&iml->multi, imr, sizeof(*imr));
2202 iml->next_rcu = inet->mc_list;
2203 iml->sflist = NULL;
2204 iml->sfmode = mode;
2205 rcu_assign_pointer(inet->mc_list, iml);
2206 ____ip_mc_inc_group(in_dev, addr, mode, GFP_KERNEL);
2207 err = 0;
2208done:
2209 return err;
2210}
2211
2212/* Join ASM (Any-Source Multicast) group
2213 */
2214int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2215{
2216 return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE);
2217}
2218EXPORT_SYMBOL(ip_mc_join_group);
2219
2220/* Join SSM (Source-Specific Multicast) group
2221 */
2222int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
2223 unsigned int mode)
2224{
2225 return __ip_mc_join_group(sk, imr, mode);
2226}
2227
2228static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2229 struct in_device *in_dev)
2230{
2231 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2232 int err;
2233
2234 if (!psf) {
2235 /* any-source empty exclude case */
2236 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2237 iml->sfmode, 0, NULL, 0);
2238 }
2239 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2240 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2241 RCU_INIT_POINTER(iml->sflist, NULL);
2242 /* decrease mem now to avoid the memleak warning */
2243 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2244 kfree_rcu(psf, rcu);
2245 return err;
2246}
2247
2248int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2249{
2250 struct inet_sock *inet = inet_sk(sk);
2251 struct ip_mc_socklist *iml;
2252 struct ip_mc_socklist __rcu **imlp;
2253 struct in_device *in_dev;
2254 struct net *net = sock_net(sk);
2255 __be32 group = imr->imr_multiaddr.s_addr;
2256 u32 ifindex;
2257 int ret = -EADDRNOTAVAIL;
2258
2259 ASSERT_RTNL();
2260
2261 in_dev = ip_mc_find_dev(net, imr);
2262 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2263 ret = -ENODEV;
2264 goto out;
2265 }
2266 ifindex = imr->imr_ifindex;
2267 for (imlp = &inet->mc_list;
2268 (iml = rtnl_dereference(*imlp)) != NULL;
2269 imlp = &iml->next_rcu) {
2270 if (iml->multi.imr_multiaddr.s_addr != group)
2271 continue;
2272 if (ifindex) {
2273 if (iml->multi.imr_ifindex != ifindex)
2274 continue;
2275 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2276 iml->multi.imr_address.s_addr)
2277 continue;
2278
2279 (void) ip_mc_leave_src(sk, iml, in_dev);
2280
2281 *imlp = iml->next_rcu;
2282
2283 if (in_dev)
2284 ip_mc_dec_group(in_dev, group);
2285
2286 /* decrease mem now to avoid the memleak warning */
2287 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2288 kfree_rcu(iml, rcu);
2289 return 0;
2290 }
2291out:
2292 return ret;
2293}
2294EXPORT_SYMBOL(ip_mc_leave_group);
2295
2296int ip_mc_source(int add, int omode, struct sock *sk, struct
2297 ip_mreq_source *mreqs, int ifindex)
2298{
2299 int err;
2300 struct ip_mreqn imr;
2301 __be32 addr = mreqs->imr_multiaddr;
2302 struct ip_mc_socklist *pmc;
2303 struct in_device *in_dev = NULL;
2304 struct inet_sock *inet = inet_sk(sk);
2305 struct ip_sf_socklist *psl;
2306 struct net *net = sock_net(sk);
2307 int leavegroup = 0;
2308 int i, j, rv;
2309
2310 if (!ipv4_is_multicast(addr))
2311 return -EINVAL;
2312
2313 ASSERT_RTNL();
2314
2315 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2316 imr.imr_address.s_addr = mreqs->imr_interface;
2317 imr.imr_ifindex = ifindex;
2318 in_dev = ip_mc_find_dev(net, &imr);
2319
2320 if (!in_dev) {
2321 err = -ENODEV;
2322 goto done;
2323 }
2324 err = -EADDRNOTAVAIL;
2325
2326 for_each_pmc_rtnl(inet, pmc) {
2327 if ((pmc->multi.imr_multiaddr.s_addr ==
2328 imr.imr_multiaddr.s_addr) &&
2329 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2330 break;
2331 }
2332 if (!pmc) { /* must have a prior join */
2333 err = -EINVAL;
2334 goto done;
2335 }
2336 /* if a source filter was set, must be the same mode as before */
2337 if (pmc->sflist) {
2338 if (pmc->sfmode != omode) {
2339 err = -EINVAL;
2340 goto done;
2341 }
2342 } else if (pmc->sfmode != omode) {
2343 /* allow mode switches for empty-set filters */
2344 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2345 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2346 NULL, 0);
2347 pmc->sfmode = omode;
2348 }
2349
2350 psl = rtnl_dereference(pmc->sflist);
2351 if (!add) {
2352 if (!psl)
2353 goto done; /* err = -EADDRNOTAVAIL */
2354 rv = !0;
2355 for (i = 0; i < psl->sl_count; i++) {
2356 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2357 sizeof(__be32));
2358 if (rv == 0)
2359 break;
2360 }
2361 if (rv) /* source not found */
2362 goto done; /* err = -EADDRNOTAVAIL */
2363
2364 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2365 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2366 leavegroup = 1;
2367 goto done;
2368 }
2369
2370 /* update the interface filter */
2371 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2372 &mreqs->imr_sourceaddr, 1);
2373
2374 for (j = i+1; j < psl->sl_count; j++)
2375 psl->sl_addr[j-1] = psl->sl_addr[j];
2376 psl->sl_count--;
2377 err = 0;
2378 goto done;
2379 }
2380 /* else, add a new source to the filter */
2381
2382 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2383 err = -ENOBUFS;
2384 goto done;
2385 }
2386 if (!psl || psl->sl_count == psl->sl_max) {
2387 struct ip_sf_socklist *newpsl;
2388 int count = IP_SFBLOCK;
2389
2390 if (psl)
2391 count += psl->sl_max;
2392 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2393 if (!newpsl) {
2394 err = -ENOBUFS;
2395 goto done;
2396 }
2397 newpsl->sl_max = count;
2398 newpsl->sl_count = count - IP_SFBLOCK;
2399 if (psl) {
2400 for (i = 0; i < psl->sl_count; i++)
2401 newpsl->sl_addr[i] = psl->sl_addr[i];
2402 /* decrease mem now to avoid the memleak warning */
2403 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2404 kfree_rcu(psl, rcu);
2405 }
2406 rcu_assign_pointer(pmc->sflist, newpsl);
2407 psl = newpsl;
2408 }
2409 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2410 for (i = 0; i < psl->sl_count; i++) {
2411 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2412 sizeof(__be32));
2413 if (rv == 0)
2414 break;
2415 }
2416 if (rv == 0) /* address already there is an error */
2417 goto done;
2418 for (j = psl->sl_count-1; j >= i; j--)
2419 psl->sl_addr[j+1] = psl->sl_addr[j];
2420 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2421 psl->sl_count++;
2422 err = 0;
2423 /* update the interface list */
2424 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2425 &mreqs->imr_sourceaddr, 1);
2426done:
2427 if (leavegroup)
2428 err = ip_mc_leave_group(sk, &imr);
2429 return err;
2430}
2431
2432int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2433{
2434 int err = 0;
2435 struct ip_mreqn imr;
2436 __be32 addr = msf->imsf_multiaddr;
2437 struct ip_mc_socklist *pmc;
2438 struct in_device *in_dev;
2439 struct inet_sock *inet = inet_sk(sk);
2440 struct ip_sf_socklist *newpsl, *psl;
2441 struct net *net = sock_net(sk);
2442 int leavegroup = 0;
2443
2444 if (!ipv4_is_multicast(addr))
2445 return -EINVAL;
2446 if (msf->imsf_fmode != MCAST_INCLUDE &&
2447 msf->imsf_fmode != MCAST_EXCLUDE)
2448 return -EINVAL;
2449
2450 ASSERT_RTNL();
2451
2452 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2453 imr.imr_address.s_addr = msf->imsf_interface;
2454 imr.imr_ifindex = ifindex;
2455 in_dev = ip_mc_find_dev(net, &imr);
2456
2457 if (!in_dev) {
2458 err = -ENODEV;
2459 goto done;
2460 }
2461
2462 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2463 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2464 leavegroup = 1;
2465 goto done;
2466 }
2467
2468 for_each_pmc_rtnl(inet, pmc) {
2469 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2470 pmc->multi.imr_ifindex == imr.imr_ifindex)
2471 break;
2472 }
2473 if (!pmc) { /* must have a prior join */
2474 err = -EINVAL;
2475 goto done;
2476 }
2477 if (msf->imsf_numsrc) {
2478 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2479 GFP_KERNEL);
2480 if (!newpsl) {
2481 err = -ENOBUFS;
2482 goto done;
2483 }
2484 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2485 memcpy(newpsl->sl_addr, msf->imsf_slist,
2486 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2487 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2488 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2489 if (err) {
2490 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2491 goto done;
2492 }
2493 } else {
2494 newpsl = NULL;
2495 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2496 msf->imsf_fmode, 0, NULL, 0);
2497 }
2498 psl = rtnl_dereference(pmc->sflist);
2499 if (psl) {
2500 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2501 psl->sl_count, psl->sl_addr, 0);
2502 /* decrease mem now to avoid the memleak warning */
2503 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2504 kfree_rcu(psl, rcu);
2505 } else
2506 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2507 0, NULL, 0);
2508 rcu_assign_pointer(pmc->sflist, newpsl);
2509 pmc->sfmode = msf->imsf_fmode;
2510 err = 0;
2511done:
2512 if (leavegroup)
2513 err = ip_mc_leave_group(sk, &imr);
2514 return err;
2515}
2516
2517int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2518 struct ip_msfilter __user *optval, int __user *optlen)
2519{
2520 int err, len, count, copycount;
2521 struct ip_mreqn imr;
2522 __be32 addr = msf->imsf_multiaddr;
2523 struct ip_mc_socklist *pmc;
2524 struct in_device *in_dev;
2525 struct inet_sock *inet = inet_sk(sk);
2526 struct ip_sf_socklist *psl;
2527 struct net *net = sock_net(sk);
2528
2529 ASSERT_RTNL();
2530
2531 if (!ipv4_is_multicast(addr))
2532 return -EINVAL;
2533
2534 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2535 imr.imr_address.s_addr = msf->imsf_interface;
2536 imr.imr_ifindex = 0;
2537 in_dev = ip_mc_find_dev(net, &imr);
2538
2539 if (!in_dev) {
2540 err = -ENODEV;
2541 goto done;
2542 }
2543 err = -EADDRNOTAVAIL;
2544
2545 for_each_pmc_rtnl(inet, pmc) {
2546 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2547 pmc->multi.imr_ifindex == imr.imr_ifindex)
2548 break;
2549 }
2550 if (!pmc) /* must have a prior join */
2551 goto done;
2552 msf->imsf_fmode = pmc->sfmode;
2553 psl = rtnl_dereference(pmc->sflist);
2554 if (!psl) {
2555 len = 0;
2556 count = 0;
2557 } else {
2558 count = psl->sl_count;
2559 }
2560 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2561 len = copycount * sizeof(psl->sl_addr[0]);
2562 msf->imsf_numsrc = count;
2563 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2564 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2565 return -EFAULT;
2566 }
2567 if (len &&
2568 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2569 return -EFAULT;
2570 return 0;
2571done:
2572 return err;
2573}
2574
2575int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2576 struct sockaddr_storage __user *p)
2577{
2578 int i, count, copycount;
2579 struct sockaddr_in *psin;
2580 __be32 addr;
2581 struct ip_mc_socklist *pmc;
2582 struct inet_sock *inet = inet_sk(sk);
2583 struct ip_sf_socklist *psl;
2584
2585 ASSERT_RTNL();
2586
2587 psin = (struct sockaddr_in *)&gsf->gf_group;
2588 if (psin->sin_family != AF_INET)
2589 return -EINVAL;
2590 addr = psin->sin_addr.s_addr;
2591 if (!ipv4_is_multicast(addr))
2592 return -EINVAL;
2593
2594 for_each_pmc_rtnl(inet, pmc) {
2595 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2596 pmc->multi.imr_ifindex == gsf->gf_interface)
2597 break;
2598 }
2599 if (!pmc) /* must have a prior join */
2600 return -EADDRNOTAVAIL;
2601 gsf->gf_fmode = pmc->sfmode;
2602 psl = rtnl_dereference(pmc->sflist);
2603 count = psl ? psl->sl_count : 0;
2604 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2605 gsf->gf_numsrc = count;
2606 for (i = 0; i < copycount; i++, p++) {
2607 struct sockaddr_storage ss;
2608
2609 psin = (struct sockaddr_in *)&ss;
2610 memset(&ss, 0, sizeof(ss));
2611 psin->sin_family = AF_INET;
2612 psin->sin_addr.s_addr = psl->sl_addr[i];
2613 if (copy_to_user(p, &ss, sizeof(ss)))
2614 return -EFAULT;
2615 }
2616 return 0;
2617}
2618
2619/*
2620 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2621 */
2622int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr,
2623 int dif, int sdif)
2624{
2625 struct inet_sock *inet = inet_sk(sk);
2626 struct ip_mc_socklist *pmc;
2627 struct ip_sf_socklist *psl;
2628 int i;
2629 int ret;
2630
2631 ret = 1;
2632 if (!ipv4_is_multicast(loc_addr))
2633 goto out;
2634
2635 rcu_read_lock();
2636 for_each_pmc_rcu(inet, pmc) {
2637 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2638 (pmc->multi.imr_ifindex == dif ||
2639 (sdif && pmc->multi.imr_ifindex == sdif)))
2640 break;
2641 }
2642 ret = inet->mc_all;
2643 if (!pmc)
2644 goto unlock;
2645 psl = rcu_dereference(pmc->sflist);
2646 ret = (pmc->sfmode == MCAST_EXCLUDE);
2647 if (!psl)
2648 goto unlock;
2649
2650 for (i = 0; i < psl->sl_count; i++) {
2651 if (psl->sl_addr[i] == rmt_addr)
2652 break;
2653 }
2654 ret = 0;
2655 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2656 goto unlock;
2657 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2658 goto unlock;
2659 ret = 1;
2660unlock:
2661 rcu_read_unlock();
2662out:
2663 return ret;
2664}
2665
2666/*
2667 * A socket is closing.
2668 */
2669
2670void ip_mc_drop_socket(struct sock *sk)
2671{
2672 struct inet_sock *inet = inet_sk(sk);
2673 struct ip_mc_socklist *iml;
2674 struct net *net = sock_net(sk);
2675
2676 if (!inet->mc_list)
2677 return;
2678
2679 rtnl_lock();
2680 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2681 struct in_device *in_dev;
2682
2683 inet->mc_list = iml->next_rcu;
2684 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2685 (void) ip_mc_leave_src(sk, iml, in_dev);
2686 if (in_dev)
2687 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2688 /* decrease mem now to avoid the memleak warning */
2689 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2690 kfree_rcu(iml, rcu);
2691 }
2692 rtnl_unlock();
2693}
2694
2695/* called with rcu_read_lock() */
2696int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2697{
2698 struct ip_mc_list *im;
2699 struct ip_mc_list __rcu **mc_hash;
2700 struct ip_sf_list *psf;
2701 int rv = 0;
2702
2703 mc_hash = rcu_dereference(in_dev->mc_hash);
2704 if (mc_hash) {
2705 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2706
2707 for (im = rcu_dereference(mc_hash[hash]);
2708 im != NULL;
2709 im = rcu_dereference(im->next_hash)) {
2710 if (im->multiaddr == mc_addr)
2711 break;
2712 }
2713 } else {
2714 for_each_pmc_rcu(in_dev, im) {
2715 if (im->multiaddr == mc_addr)
2716 break;
2717 }
2718 }
2719 if (im && proto == IPPROTO_IGMP) {
2720 rv = 1;
2721 } else if (im) {
2722 if (src_addr) {
2723 spin_lock_bh(&im->lock);
2724 for (psf = im->sources; psf; psf = psf->sf_next) {
2725 if (psf->sf_inaddr == src_addr)
2726 break;
2727 }
2728 if (psf)
2729 rv = psf->sf_count[MCAST_INCLUDE] ||
2730 psf->sf_count[MCAST_EXCLUDE] !=
2731 im->sfcount[MCAST_EXCLUDE];
2732 else
2733 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2734 spin_unlock_bh(&im->lock);
2735 } else
2736 rv = 1; /* unspecified source; tentatively allow */
2737 }
2738 return rv;
2739}
2740
2741#if defined(CONFIG_PROC_FS)
2742struct igmp_mc_iter_state {
2743 struct seq_net_private p;
2744 struct net_device *dev;
2745 struct in_device *in_dev;
2746};
2747
2748#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2749
2750static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2751{
2752 struct net *net = seq_file_net(seq);
2753 struct ip_mc_list *im = NULL;
2754 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2755
2756 state->in_dev = NULL;
2757 for_each_netdev_rcu(net, state->dev) {
2758 struct in_device *in_dev;
2759
2760 in_dev = __in_dev_get_rcu(state->dev);
2761 if (!in_dev)
2762 continue;
2763 im = rcu_dereference(in_dev->mc_list);
2764 if (im) {
2765 state->in_dev = in_dev;
2766 break;
2767 }
2768 }
2769 return im;
2770}
2771
2772static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2773{
2774 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2775
2776 im = rcu_dereference(im->next_rcu);
2777 while (!im) {
2778 state->dev = next_net_device_rcu(state->dev);
2779 if (!state->dev) {
2780 state->in_dev = NULL;
2781 break;
2782 }
2783 state->in_dev = __in_dev_get_rcu(state->dev);
2784 if (!state->in_dev)
2785 continue;
2786 im = rcu_dereference(state->in_dev->mc_list);
2787 }
2788 return im;
2789}
2790
2791static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2792{
2793 struct ip_mc_list *im = igmp_mc_get_first(seq);
2794 if (im)
2795 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2796 --pos;
2797 return pos ? NULL : im;
2798}
2799
2800static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2801 __acquires(rcu)
2802{
2803 rcu_read_lock();
2804 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2805}
2806
2807static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2808{
2809 struct ip_mc_list *im;
2810 if (v == SEQ_START_TOKEN)
2811 im = igmp_mc_get_first(seq);
2812 else
2813 im = igmp_mc_get_next(seq, v);
2814 ++*pos;
2815 return im;
2816}
2817
2818static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2819 __releases(rcu)
2820{
2821 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2822
2823 state->in_dev = NULL;
2824 state->dev = NULL;
2825 rcu_read_unlock();
2826}
2827
2828static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2829{
2830 if (v == SEQ_START_TOKEN)
2831 seq_puts(seq,
2832 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2833 else {
2834 struct ip_mc_list *im = (struct ip_mc_list *)v;
2835 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2836 char *querier;
2837 long delta;
2838
2839#ifdef CONFIG_IP_MULTICAST
2840 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2841 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2842 "V3";
2843#else
2844 querier = "NONE";
2845#endif
2846
2847 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2848 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2849 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2850 }
2851
2852 delta = im->timer.expires - jiffies;
2853 seq_printf(seq,
2854 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2855 im->multiaddr, im->users,
2856 im->tm_running,
2857 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2858 im->reporter);
2859 }
2860 return 0;
2861}
2862
2863static const struct seq_operations igmp_mc_seq_ops = {
2864 .start = igmp_mc_seq_start,
2865 .next = igmp_mc_seq_next,
2866 .stop = igmp_mc_seq_stop,
2867 .show = igmp_mc_seq_show,
2868};
2869
2870struct igmp_mcf_iter_state {
2871 struct seq_net_private p;
2872 struct net_device *dev;
2873 struct in_device *idev;
2874 struct ip_mc_list *im;
2875};
2876
2877#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2878
2879static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2880{
2881 struct net *net = seq_file_net(seq);
2882 struct ip_sf_list *psf = NULL;
2883 struct ip_mc_list *im = NULL;
2884 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2885
2886 state->idev = NULL;
2887 state->im = NULL;
2888 for_each_netdev_rcu(net, state->dev) {
2889 struct in_device *idev;
2890 idev = __in_dev_get_rcu(state->dev);
2891 if (unlikely(!idev))
2892 continue;
2893 im = rcu_dereference(idev->mc_list);
2894 if (likely(im)) {
2895 spin_lock_bh(&im->lock);
2896 psf = im->sources;
2897 if (likely(psf)) {
2898 state->im = im;
2899 state->idev = idev;
2900 break;
2901 }
2902 spin_unlock_bh(&im->lock);
2903 }
2904 }
2905 return psf;
2906}
2907
2908static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2909{
2910 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2911
2912 psf = psf->sf_next;
2913 while (!psf) {
2914 spin_unlock_bh(&state->im->lock);
2915 state->im = state->im->next;
2916 while (!state->im) {
2917 state->dev = next_net_device_rcu(state->dev);
2918 if (!state->dev) {
2919 state->idev = NULL;
2920 goto out;
2921 }
2922 state->idev = __in_dev_get_rcu(state->dev);
2923 if (!state->idev)
2924 continue;
2925 state->im = rcu_dereference(state->idev->mc_list);
2926 }
2927 if (!state->im)
2928 break;
2929 spin_lock_bh(&state->im->lock);
2930 psf = state->im->sources;
2931 }
2932out:
2933 return psf;
2934}
2935
2936static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2937{
2938 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2939 if (psf)
2940 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2941 --pos;
2942 return pos ? NULL : psf;
2943}
2944
2945static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2946 __acquires(rcu)
2947{
2948 rcu_read_lock();
2949 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2950}
2951
2952static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2953{
2954 struct ip_sf_list *psf;
2955 if (v == SEQ_START_TOKEN)
2956 psf = igmp_mcf_get_first(seq);
2957 else
2958 psf = igmp_mcf_get_next(seq, v);
2959 ++*pos;
2960 return psf;
2961}
2962
2963static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2964 __releases(rcu)
2965{
2966 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2967 if (likely(state->im)) {
2968 spin_unlock_bh(&state->im->lock);
2969 state->im = NULL;
2970 }
2971 state->idev = NULL;
2972 state->dev = NULL;
2973 rcu_read_unlock();
2974}
2975
2976static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2977{
2978 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2979 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2980
2981 if (v == SEQ_START_TOKEN) {
2982 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2983 } else {
2984 seq_printf(seq,
2985 "%3d %6.6s 0x%08x "
2986 "0x%08x %6lu %6lu\n",
2987 state->dev->ifindex, state->dev->name,
2988 ntohl(state->im->multiaddr),
2989 ntohl(psf->sf_inaddr),
2990 psf->sf_count[MCAST_INCLUDE],
2991 psf->sf_count[MCAST_EXCLUDE]);
2992 }
2993 return 0;
2994}
2995
2996static const struct seq_operations igmp_mcf_seq_ops = {
2997 .start = igmp_mcf_seq_start,
2998 .next = igmp_mcf_seq_next,
2999 .stop = igmp_mcf_seq_stop,
3000 .show = igmp_mcf_seq_show,
3001};
3002
3003static int __net_init igmp_net_init(struct net *net)
3004{
3005 struct proc_dir_entry *pde;
3006 int err;
3007
3008 pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops,
3009 sizeof(struct igmp_mc_iter_state));
3010 if (!pde)
3011 goto out_igmp;
3012 pde = proc_create_net("mcfilter", 0444, net->proc_net,
3013 &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state));
3014 if (!pde)
3015 goto out_mcfilter;
3016 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
3017 SOCK_DGRAM, 0, net);
3018 if (err < 0) {
3019 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
3020 err);
3021 goto out_sock;
3022 }
3023
3024 return 0;
3025
3026out_sock:
3027 remove_proc_entry("mcfilter", net->proc_net);
3028out_mcfilter:
3029 remove_proc_entry("igmp", net->proc_net);
3030out_igmp:
3031 return -ENOMEM;
3032}
3033
3034static void __net_exit igmp_net_exit(struct net *net)
3035{
3036 remove_proc_entry("mcfilter", net->proc_net);
3037 remove_proc_entry("igmp", net->proc_net);
3038 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
3039}
3040
3041static struct pernet_operations igmp_net_ops = {
3042 .init = igmp_net_init,
3043 .exit = igmp_net_exit,
3044};
3045#endif
3046
3047static int igmp_netdev_event(struct notifier_block *this,
3048 unsigned long event, void *ptr)
3049{
3050 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3051 struct in_device *in_dev;
3052
3053 switch (event) {
3054 case NETDEV_RESEND_IGMP:
3055 in_dev = __in_dev_get_rtnl(dev);
3056 if (in_dev)
3057 ip_mc_rejoin_groups(in_dev);
3058 break;
3059 default:
3060 break;
3061 }
3062 return NOTIFY_DONE;
3063}
3064
3065static struct notifier_block igmp_notifier = {
3066 .notifier_call = igmp_netdev_event,
3067};
3068
3069int __init igmp_mc_init(void)
3070{
3071#if defined(CONFIG_PROC_FS)
3072 int err;
3073
3074 err = register_pernet_subsys(&igmp_net_ops);
3075 if (err)
3076 return err;
3077 err = register_netdevice_notifier(&igmp_notifier);
3078 if (err)
3079 goto reg_notif_fail;
3080 return 0;
3081
3082reg_notif_fail:
3083 unregister_pernet_subsys(&igmp_net_ops);
3084 return err;
3085#else
3086 return register_netdevice_notifier(&igmp_notifier);
3087#endif
3088}
1/*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
11 * Authors:
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 * Fixes:
20 *
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
23 * functions.
24 * Alan Cox : Dumped the header building experiment.
25 * Alan Cox : Minor tweaks ready for multicast routing
26 * and extended IGMP protocol.
27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
28 * writes utterly bogus code otherwise (sigh)
29 * fixed IGMP loopback to behave in the manner
30 * desired by mrouted, fixed the fact it has been
31 * broken since 1.3.6 and cleaned up a few minor
32 * points.
33 *
34 * Chih-Jen Chang : Tried to revise IGMP to Version 2
35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
36 * The enhancements are mainly based on Steve Deering's
37 * ipmulti-3.5 source code.
38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
40 * the mrouted version on that device.
41 * Chih-Jen Chang : Added the max_resp_time parameter to
42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
43 * to identify the multicast router version
44 * and do what the IGMP version 2 specified.
45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
46 * Tsu-Sheng Tsao if the specified time expired.
47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
48 * Alan Cox : Use GFP_ATOMIC in the right places.
49 * Christian Daudt : igmp timer wasn't set for local group
50 * memberships but was being deleted,
51 * which caused a "del_timer() called
52 * from %p with timer not initialized\n"
53 * message (960131).
54 * Christian Daudt : removed del_timer from
55 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
58 * true (960216).
59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
60 * igmp_heard_query never trigger. Expiry
61 * miscalculation fixed in igmp_heard_query
62 * and random() made to return unsigned to
63 * prevent negative expiry times.
64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
65 * fix from pending 2.1.x patches.
66 * Alan Cox: Forget to enable FDDI support earlier.
67 * Alexey Kuznetsov: Fixed leaving groups on device down.
68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
69 * David L Stevens: IGMPv3 support, with help from
70 * Vinay Kulkarni
71 */
72
73#include <linux/module.h>
74#include <linux/slab.h>
75#include <asm/uaccess.h>
76#include <linux/types.h>
77#include <linux/kernel.h>
78#include <linux/jiffies.h>
79#include <linux/string.h>
80#include <linux/socket.h>
81#include <linux/sockios.h>
82#include <linux/in.h>
83#include <linux/inet.h>
84#include <linux/netdevice.h>
85#include <linux/skbuff.h>
86#include <linux/inetdevice.h>
87#include <linux/igmp.h>
88#include <linux/if_arp.h>
89#include <linux/rtnetlink.h>
90#include <linux/times.h>
91#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 <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_V2_Unsolicited_Report_Interval (10*HZ)
118#define IGMP_V3_Unsolicited_Report_Interval (1*HZ)
119#define IGMP_Query_Response_Interval (10*HZ)
120#define IGMP_Unsolicited_Report_Count 2
121
122
123#define IGMP_Initial_Report_Delay (1)
124
125/* IGMP_Initial_Report_Delay is not from IGMP specs!
126 * IGMP specs require to report membership immediately after
127 * joining a group, but we delay the first report by a
128 * small interval. It seems more natural and still does not
129 * contradict to specs provided this delay is small enough.
130 */
131
132#define IGMP_V1_SEEN(in_dev) \
133 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
134 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
135 ((in_dev)->mr_v1_seen && \
136 time_before(jiffies, (in_dev)->mr_v1_seen)))
137#define IGMP_V2_SEEN(in_dev) \
138 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
139 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
140 ((in_dev)->mr_v2_seen && \
141 time_before(jiffies, (in_dev)->mr_v2_seen)))
142
143static int unsolicited_report_interval(struct in_device *in_dev)
144{
145 int interval_ms, interval_jiffies;
146
147 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
148 interval_ms = IN_DEV_CONF_GET(
149 in_dev,
150 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
151 else /* v3 */
152 interval_ms = IN_DEV_CONF_GET(
153 in_dev,
154 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
155
156 interval_jiffies = msecs_to_jiffies(interval_ms);
157
158 /* _timer functions can't handle a delay of 0 jiffies so ensure
159 * we always return a positive value.
160 */
161 if (interval_jiffies <= 0)
162 interval_jiffies = 1;
163 return interval_jiffies;
164}
165
166static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
167static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
168static void igmpv3_clear_delrec(struct in_device *in_dev);
169static int sf_setstate(struct ip_mc_list *pmc);
170static void sf_markstate(struct ip_mc_list *pmc);
171#endif
172static void ip_mc_clear_src(struct ip_mc_list *pmc);
173static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
174 int sfcount, __be32 *psfsrc, int delta);
175
176static void ip_ma_put(struct ip_mc_list *im)
177{
178 if (atomic_dec_and_test(&im->refcnt)) {
179 in_dev_put(im->interface);
180 kfree_rcu(im, rcu);
181 }
182}
183
184#define for_each_pmc_rcu(in_dev, pmc) \
185 for (pmc = rcu_dereference(in_dev->mc_list); \
186 pmc != NULL; \
187 pmc = rcu_dereference(pmc->next_rcu))
188
189#define for_each_pmc_rtnl(in_dev, pmc) \
190 for (pmc = rtnl_dereference(in_dev->mc_list); \
191 pmc != NULL; \
192 pmc = rtnl_dereference(pmc->next_rcu))
193
194#ifdef CONFIG_IP_MULTICAST
195
196/*
197 * Timer management
198 */
199
200static void igmp_stop_timer(struct ip_mc_list *im)
201{
202 spin_lock_bh(&im->lock);
203 if (del_timer(&im->timer))
204 atomic_dec(&im->refcnt);
205 im->tm_running = 0;
206 im->reporter = 0;
207 im->unsolicit_count = 0;
208 spin_unlock_bh(&im->lock);
209}
210
211/* It must be called with locked im->lock */
212static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
213{
214 int tv = prandom_u32() % max_delay;
215
216 im->tm_running = 1;
217 if (!mod_timer(&im->timer, jiffies+tv+2))
218 atomic_inc(&im->refcnt);
219}
220
221static void igmp_gq_start_timer(struct in_device *in_dev)
222{
223 int tv = prandom_u32() % in_dev->mr_maxdelay;
224
225 in_dev->mr_gq_running = 1;
226 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
227 in_dev_hold(in_dev);
228}
229
230static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
231{
232 int tv = prandom_u32() % delay;
233
234 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
235 in_dev_hold(in_dev);
236}
237
238static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
239{
240 spin_lock_bh(&im->lock);
241 im->unsolicit_count = 0;
242 if (del_timer(&im->timer)) {
243 if ((long)(im->timer.expires-jiffies) < max_delay) {
244 add_timer(&im->timer);
245 im->tm_running = 1;
246 spin_unlock_bh(&im->lock);
247 return;
248 }
249 atomic_dec(&im->refcnt);
250 }
251 igmp_start_timer(im, max_delay);
252 spin_unlock_bh(&im->lock);
253}
254
255
256/*
257 * Send an IGMP report.
258 */
259
260#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
261
262
263static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
264 int gdeleted, int sdeleted)
265{
266 switch (type) {
267 case IGMPV3_MODE_IS_INCLUDE:
268 case IGMPV3_MODE_IS_EXCLUDE:
269 if (gdeleted || sdeleted)
270 return 0;
271 if (!(pmc->gsquery && !psf->sf_gsresp)) {
272 if (pmc->sfmode == MCAST_INCLUDE)
273 return 1;
274 /* don't include if this source is excluded
275 * in all filters
276 */
277 if (psf->sf_count[MCAST_INCLUDE])
278 return type == IGMPV3_MODE_IS_INCLUDE;
279 return pmc->sfcount[MCAST_EXCLUDE] ==
280 psf->sf_count[MCAST_EXCLUDE];
281 }
282 return 0;
283 case IGMPV3_CHANGE_TO_INCLUDE:
284 if (gdeleted || sdeleted)
285 return 0;
286 return psf->sf_count[MCAST_INCLUDE] != 0;
287 case IGMPV3_CHANGE_TO_EXCLUDE:
288 if (gdeleted || sdeleted)
289 return 0;
290 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
291 psf->sf_count[MCAST_INCLUDE])
292 return 0;
293 return pmc->sfcount[MCAST_EXCLUDE] ==
294 psf->sf_count[MCAST_EXCLUDE];
295 case IGMPV3_ALLOW_NEW_SOURCES:
296 if (gdeleted || !psf->sf_crcount)
297 return 0;
298 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
299 case IGMPV3_BLOCK_OLD_SOURCES:
300 if (pmc->sfmode == MCAST_INCLUDE)
301 return gdeleted || (psf->sf_crcount && sdeleted);
302 return psf->sf_crcount && !gdeleted && !sdeleted;
303 }
304 return 0;
305}
306
307static int
308igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
309{
310 struct ip_sf_list *psf;
311 int scount = 0;
312
313 for (psf = pmc->sources; psf; psf = psf->sf_next) {
314 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
315 continue;
316 scount++;
317 }
318 return scount;
319}
320
321#define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
322
323static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
324{
325 struct sk_buff *skb;
326 struct rtable *rt;
327 struct iphdr *pip;
328 struct igmpv3_report *pig;
329 struct net *net = dev_net(dev);
330 struct flowi4 fl4;
331 int hlen = LL_RESERVED_SPACE(dev);
332 int tlen = dev->needed_tailroom;
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 igmp_skb_size(skb) = size;
345
346 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
347 0, 0,
348 IPPROTO_IGMP, 0, dev->ifindex);
349 if (IS_ERR(rt)) {
350 kfree_skb(skb);
351 return NULL;
352 }
353
354 skb_dst_set(skb, &rt->dst);
355 skb->dev = dev;
356
357 skb_reserve(skb, hlen);
358
359 skb_reset_network_header(skb);
360 pip = ip_hdr(skb);
361 skb_put(skb, sizeof(struct iphdr) + 4);
362
363 pip->version = 4;
364 pip->ihl = (sizeof(struct iphdr)+4)>>2;
365 pip->tos = 0xc0;
366 pip->frag_off = htons(IP_DF);
367 pip->ttl = 1;
368 pip->daddr = fl4.daddr;
369 pip->saddr = fl4.saddr;
370 pip->protocol = IPPROTO_IGMP;
371 pip->tot_len = 0; /* filled in later */
372 ip_select_ident(skb, &rt->dst, NULL);
373 ((u8 *)&pip[1])[0] = IPOPT_RA;
374 ((u8 *)&pip[1])[1] = 4;
375 ((u8 *)&pip[1])[2] = 0;
376 ((u8 *)&pip[1])[3] = 0;
377
378 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
379 skb_put(skb, sizeof(*pig));
380 pig = igmpv3_report_hdr(skb);
381 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
382 pig->resv1 = 0;
383 pig->csum = 0;
384 pig->resv2 = 0;
385 pig->ngrec = 0;
386 return skb;
387}
388
389static int igmpv3_sendpack(struct sk_buff *skb)
390{
391 struct igmphdr *pig = igmp_hdr(skb);
392 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
393
394 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
395
396 return ip_local_out(skb);
397}
398
399static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
400{
401 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
402}
403
404static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
405 int type, struct igmpv3_grec **ppgr)
406{
407 struct net_device *dev = pmc->interface->dev;
408 struct igmpv3_report *pih;
409 struct igmpv3_grec *pgr;
410
411 if (!skb)
412 skb = igmpv3_newpack(dev, dev->mtu);
413 if (!skb)
414 return NULL;
415 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
416 pgr->grec_type = type;
417 pgr->grec_auxwords = 0;
418 pgr->grec_nsrcs = 0;
419 pgr->grec_mca = pmc->multiaddr;
420 pih = igmpv3_report_hdr(skb);
421 pih->ngrec = htons(ntohs(pih->ngrec)+1);
422 *ppgr = pgr;
423 return skb;
424}
425
426#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
427 skb_tailroom(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 /* EX and TO_EX get a fresh packet, if needed */
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 /* clear marks on query responses */
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; /* truncate these */
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 /* make sure we have room for group header */
523 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
524 igmpv3_sendpack(skb);
525 skb = NULL; /* add_grhead will get a new one */
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; /* clear query state on report */
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 * remove zero-count source records from a source filter list
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 /* deleted MCA's */
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 /* change recs */
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); /* deleted sources */
646
647 /* filter mode changes */
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 == NULL) {
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(skb, &rt->dst, 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 ? in_dev->mr_qrv :
760 IGMP_Unsolicited_Report_Count;
761 igmp_ifc_start_timer(in_dev, 1);
762}
763
764
765static void igmp_timer_expire(unsigned long data)
766{
767 struct ip_mc_list *im = (struct ip_mc_list *)data;
768 struct in_device *in_dev = im->interface;
769
770 spin_lock(&im->lock);
771 im->tm_running = 0;
772
773 if (im->unsolicit_count) {
774 im->unsolicit_count--;
775 igmp_start_timer(im, unsolicited_report_interval(in_dev));
776 }
777 im->reporter = 1;
778 spin_unlock(&im->lock);
779
780 if (IGMP_V1_SEEN(in_dev))
781 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
782 else if (IGMP_V2_SEEN(in_dev))
783 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
784 else
785 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
786
787 ip_ma_put(im);
788}
789
790/* mark EXCLUDE-mode sources */
791static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
792{
793 struct ip_sf_list *psf;
794 int i, scount;
795
796 scount = 0;
797 for (psf = pmc->sources; psf; psf = psf->sf_next) {
798 if (scount == nsrcs)
799 break;
800 for (i = 0; i < nsrcs; i++) {
801 /* skip inactive filters */
802 if (psf->sf_count[MCAST_INCLUDE] ||
803 pmc->sfcount[MCAST_EXCLUDE] !=
804 psf->sf_count[MCAST_EXCLUDE])
805 break;
806 if (srcs[i] == psf->sf_inaddr) {
807 scount++;
808 break;
809 }
810 }
811 }
812 pmc->gsquery = 0;
813 if (scount == nsrcs) /* all sources excluded */
814 return 0;
815 return 1;
816}
817
818static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
819{
820 struct ip_sf_list *psf;
821 int i, scount;
822
823 if (pmc->sfmode == MCAST_EXCLUDE)
824 return igmp_xmarksources(pmc, nsrcs, srcs);
825
826 /* mark INCLUDE-mode sources */
827 scount = 0;
828 for (psf = pmc->sources; psf; psf = psf->sf_next) {
829 if (scount == nsrcs)
830 break;
831 for (i = 0; i < nsrcs; i++)
832 if (srcs[i] == psf->sf_inaddr) {
833 psf->sf_gsresp = 1;
834 scount++;
835 break;
836 }
837 }
838 if (!scount) {
839 pmc->gsquery = 0;
840 return 0;
841 }
842 pmc->gsquery = 1;
843 return 1;
844}
845
846/* return true if packet was dropped */
847static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
848{
849 struct ip_mc_list *im;
850
851 /* Timers are only set for non-local groups */
852
853 if (group == IGMP_ALL_HOSTS)
854 return false;
855
856 rcu_read_lock();
857 for_each_pmc_rcu(in_dev, im) {
858 if (im->multiaddr == group) {
859 igmp_stop_timer(im);
860 break;
861 }
862 }
863 rcu_read_unlock();
864 return false;
865}
866
867/* return true if packet was dropped */
868static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
869 int len)
870{
871 struct igmphdr *ih = igmp_hdr(skb);
872 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
873 struct ip_mc_list *im;
874 __be32 group = ih->group;
875 int max_delay;
876 int mark = 0;
877
878
879 if (len == 8) {
880 if (ih->code == 0) {
881 /* Alas, old v1 router presents here. */
882
883 max_delay = IGMP_Query_Response_Interval;
884 in_dev->mr_v1_seen = jiffies +
885 IGMP_V1_Router_Present_Timeout;
886 group = 0;
887 } else {
888 /* v2 router present */
889 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
890 in_dev->mr_v2_seen = jiffies +
891 IGMP_V2_Router_Present_Timeout;
892 }
893 /* cancel the interface change timer */
894 in_dev->mr_ifc_count = 0;
895 if (del_timer(&in_dev->mr_ifc_timer))
896 __in_dev_put(in_dev);
897 /* clear deleted report items */
898 igmpv3_clear_delrec(in_dev);
899 } else if (len < 12) {
900 return true; /* ignore bogus packet; freed by caller */
901 } else if (IGMP_V1_SEEN(in_dev)) {
902 /* This is a v3 query with v1 queriers present */
903 max_delay = IGMP_Query_Response_Interval;
904 group = 0;
905 } else if (IGMP_V2_SEEN(in_dev)) {
906 /* this is a v3 query with v2 queriers present;
907 * Interpretation of the max_delay code is problematic here.
908 * A real v2 host would use ih_code directly, while v3 has a
909 * different encoding. We use the v3 encoding as more likely
910 * to be intended in a v3 query.
911 */
912 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
913 if (!max_delay)
914 max_delay = 1; /* can't mod w/ 0 */
915 } else { /* v3 */
916 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
917 return true;
918
919 ih3 = igmpv3_query_hdr(skb);
920 if (ih3->nsrcs) {
921 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
922 + ntohs(ih3->nsrcs)*sizeof(__be32)))
923 return true;
924 ih3 = igmpv3_query_hdr(skb);
925 }
926
927 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
928 if (!max_delay)
929 max_delay = 1; /* can't mod w/ 0 */
930 in_dev->mr_maxdelay = max_delay;
931 if (ih3->qrv)
932 in_dev->mr_qrv = ih3->qrv;
933 if (!group) { /* general query */
934 if (ih3->nsrcs)
935 return false; /* no sources allowed */
936 igmp_gq_start_timer(in_dev);
937 return false;
938 }
939 /* mark sources to include, if group & source-specific */
940 mark = ih3->nsrcs != 0;
941 }
942
943 /*
944 * - Start the timers in all of our membership records
945 * that the query applies to for the interface on
946 * which the query arrived excl. those that belong
947 * to a "local" group (224.0.0.X)
948 * - For timers already running check if they need to
949 * be reset.
950 * - Use the igmp->igmp_code field as the maximum
951 * delay possible
952 */
953 rcu_read_lock();
954 for_each_pmc_rcu(in_dev, im) {
955 int changed;
956
957 if (group && group != im->multiaddr)
958 continue;
959 if (im->multiaddr == IGMP_ALL_HOSTS)
960 continue;
961 spin_lock_bh(&im->lock);
962 if (im->tm_running)
963 im->gsquery = im->gsquery && mark;
964 else
965 im->gsquery = mark;
966 changed = !im->gsquery ||
967 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
968 spin_unlock_bh(&im->lock);
969 if (changed)
970 igmp_mod_timer(im, max_delay);
971 }
972 rcu_read_unlock();
973 return false;
974}
975
976/* called in rcu_read_lock() section */
977int igmp_rcv(struct sk_buff *skb)
978{
979 /* This basically follows the spec line by line -- see RFC1112 */
980 struct igmphdr *ih;
981 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
982 int len = skb->len;
983 bool dropped = true;
984
985 if (in_dev == NULL)
986 goto drop;
987
988 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
989 goto drop;
990
991 switch (skb->ip_summed) {
992 case CHECKSUM_COMPLETE:
993 if (!csum_fold(skb->csum))
994 break;
995 /* fall through */
996 case CHECKSUM_NONE:
997 skb->csum = 0;
998 if (__skb_checksum_complete(skb))
999 goto drop;
1000 }
1001
1002 ih = igmp_hdr(skb);
1003 switch (ih->type) {
1004 case IGMP_HOST_MEMBERSHIP_QUERY:
1005 dropped = igmp_heard_query(in_dev, skb, len);
1006 break;
1007 case IGMP_HOST_MEMBERSHIP_REPORT:
1008 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1009 /* Is it our report looped back? */
1010 if (rt_is_output_route(skb_rtable(skb)))
1011 break;
1012 /* don't rely on MC router hearing unicast reports */
1013 if (skb->pkt_type == PACKET_MULTICAST ||
1014 skb->pkt_type == PACKET_BROADCAST)
1015 dropped = igmp_heard_report(in_dev, ih->group);
1016 break;
1017 case IGMP_PIM:
1018#ifdef CONFIG_IP_PIMSM_V1
1019 return pim_rcv_v1(skb);
1020#endif
1021 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1022 case IGMP_DVMRP:
1023 case IGMP_TRACE:
1024 case IGMP_HOST_LEAVE_MESSAGE:
1025 case IGMP_MTRACE:
1026 case IGMP_MTRACE_RESP:
1027 break;
1028 default:
1029 break;
1030 }
1031
1032drop:
1033 if (dropped)
1034 kfree_skb(skb);
1035 else
1036 consume_skb(skb);
1037 return 0;
1038}
1039
1040#endif
1041
1042
1043/*
1044 * Add a filter to a device
1045 */
1046
1047static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1048{
1049 char buf[MAX_ADDR_LEN];
1050 struct net_device *dev = in_dev->dev;
1051
1052 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1053 We will get multicast token leakage, when IFF_MULTICAST
1054 is changed. This check should be done in ndo_set_rx_mode
1055 routine. Something sort of:
1056 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1057 --ANK
1058 */
1059 if (arp_mc_map(addr, buf, dev, 0) == 0)
1060 dev_mc_add(dev, buf);
1061}
1062
1063/*
1064 * Remove a filter from a device
1065 */
1066
1067static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1068{
1069 char buf[MAX_ADDR_LEN];
1070 struct net_device *dev = in_dev->dev;
1071
1072 if (arp_mc_map(addr, buf, dev, 0) == 0)
1073 dev_mc_del(dev, buf);
1074}
1075
1076#ifdef CONFIG_IP_MULTICAST
1077/*
1078 * deleted ip_mc_list manipulation
1079 */
1080static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1081{
1082 struct ip_mc_list *pmc;
1083
1084 /* this is an "ip_mc_list" for convenience; only the fields below
1085 * are actually used. In particular, the refcnt and users are not
1086 * used for management of the delete list. Using the same structure
1087 * for deleted items allows change reports to use common code with
1088 * non-deleted or query-response MCA's.
1089 */
1090 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1091 if (!pmc)
1092 return;
1093 spin_lock_bh(&im->lock);
1094 pmc->interface = im->interface;
1095 in_dev_hold(in_dev);
1096 pmc->multiaddr = im->multiaddr;
1097 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1098 IGMP_Unsolicited_Report_Count;
1099 pmc->sfmode = im->sfmode;
1100 if (pmc->sfmode == MCAST_INCLUDE) {
1101 struct ip_sf_list *psf;
1102
1103 pmc->tomb = im->tomb;
1104 pmc->sources = im->sources;
1105 im->tomb = im->sources = NULL;
1106 for (psf = pmc->sources; psf; psf = psf->sf_next)
1107 psf->sf_crcount = pmc->crcount;
1108 }
1109 spin_unlock_bh(&im->lock);
1110
1111 spin_lock_bh(&in_dev->mc_tomb_lock);
1112 pmc->next = in_dev->mc_tomb;
1113 in_dev->mc_tomb = pmc;
1114 spin_unlock_bh(&in_dev->mc_tomb_lock);
1115}
1116
1117static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1118{
1119 struct ip_mc_list *pmc, *pmc_prev;
1120 struct ip_sf_list *psf, *psf_next;
1121
1122 spin_lock_bh(&in_dev->mc_tomb_lock);
1123 pmc_prev = NULL;
1124 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1125 if (pmc->multiaddr == multiaddr)
1126 break;
1127 pmc_prev = pmc;
1128 }
1129 if (pmc) {
1130 if (pmc_prev)
1131 pmc_prev->next = pmc->next;
1132 else
1133 in_dev->mc_tomb = pmc->next;
1134 }
1135 spin_unlock_bh(&in_dev->mc_tomb_lock);
1136 if (pmc) {
1137 for (psf = pmc->tomb; psf; psf = psf_next) {
1138 psf_next = psf->sf_next;
1139 kfree(psf);
1140 }
1141 in_dev_put(pmc->interface);
1142 kfree(pmc);
1143 }
1144}
1145
1146static void igmpv3_clear_delrec(struct in_device *in_dev)
1147{
1148 struct ip_mc_list *pmc, *nextpmc;
1149
1150 spin_lock_bh(&in_dev->mc_tomb_lock);
1151 pmc = in_dev->mc_tomb;
1152 in_dev->mc_tomb = NULL;
1153 spin_unlock_bh(&in_dev->mc_tomb_lock);
1154
1155 for (; pmc; pmc = nextpmc) {
1156 nextpmc = pmc->next;
1157 ip_mc_clear_src(pmc);
1158 in_dev_put(pmc->interface);
1159 kfree(pmc);
1160 }
1161 /* clear dead sources, too */
1162 rcu_read_lock();
1163 for_each_pmc_rcu(in_dev, pmc) {
1164 struct ip_sf_list *psf, *psf_next;
1165
1166 spin_lock_bh(&pmc->lock);
1167 psf = pmc->tomb;
1168 pmc->tomb = NULL;
1169 spin_unlock_bh(&pmc->lock);
1170 for (; psf; psf = psf_next) {
1171 psf_next = psf->sf_next;
1172 kfree(psf);
1173 }
1174 }
1175 rcu_read_unlock();
1176}
1177#endif
1178
1179static void igmp_group_dropped(struct ip_mc_list *im)
1180{
1181 struct in_device *in_dev = im->interface;
1182#ifdef CONFIG_IP_MULTICAST
1183 int reporter;
1184#endif
1185
1186 if (im->loaded) {
1187 im->loaded = 0;
1188 ip_mc_filter_del(in_dev, im->multiaddr);
1189 }
1190
1191#ifdef CONFIG_IP_MULTICAST
1192 if (im->multiaddr == IGMP_ALL_HOSTS)
1193 return;
1194
1195 reporter = im->reporter;
1196 igmp_stop_timer(im);
1197
1198 if (!in_dev->dead) {
1199 if (IGMP_V1_SEEN(in_dev))
1200 return;
1201 if (IGMP_V2_SEEN(in_dev)) {
1202 if (reporter)
1203 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1204 return;
1205 }
1206 /* IGMPv3 */
1207 igmpv3_add_delrec(in_dev, im);
1208
1209 igmp_ifc_event(in_dev);
1210 }
1211#endif
1212}
1213
1214static void igmp_group_added(struct ip_mc_list *im)
1215{
1216 struct in_device *in_dev = im->interface;
1217
1218 if (im->loaded == 0) {
1219 im->loaded = 1;
1220 ip_mc_filter_add(in_dev, im->multiaddr);
1221 }
1222
1223#ifdef CONFIG_IP_MULTICAST
1224 if (im->multiaddr == IGMP_ALL_HOSTS)
1225 return;
1226
1227 if (in_dev->dead)
1228 return;
1229 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1230 spin_lock_bh(&im->lock);
1231 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1232 spin_unlock_bh(&im->lock);
1233 return;
1234 }
1235 /* else, v3 */
1236
1237 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1238 IGMP_Unsolicited_Report_Count;
1239 igmp_ifc_event(in_dev);
1240#endif
1241}
1242
1243
1244/*
1245 * Multicast list managers
1246 */
1247
1248static u32 ip_mc_hash(const struct ip_mc_list *im)
1249{
1250 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1251}
1252
1253static void ip_mc_hash_add(struct in_device *in_dev,
1254 struct ip_mc_list *im)
1255{
1256 struct ip_mc_list __rcu **mc_hash;
1257 u32 hash;
1258
1259 mc_hash = rtnl_dereference(in_dev->mc_hash);
1260 if (mc_hash) {
1261 hash = ip_mc_hash(im);
1262 im->next_hash = mc_hash[hash];
1263 rcu_assign_pointer(mc_hash[hash], im);
1264 return;
1265 }
1266
1267 /* do not use a hash table for small number of items */
1268 if (in_dev->mc_count < 4)
1269 return;
1270
1271 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1272 GFP_KERNEL);
1273 if (!mc_hash)
1274 return;
1275
1276 for_each_pmc_rtnl(in_dev, im) {
1277 hash = ip_mc_hash(im);
1278 im->next_hash = mc_hash[hash];
1279 RCU_INIT_POINTER(mc_hash[hash], im);
1280 }
1281
1282 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1283}
1284
1285static void ip_mc_hash_remove(struct in_device *in_dev,
1286 struct ip_mc_list *im)
1287{
1288 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1289 struct ip_mc_list *aux;
1290
1291 if (!mc_hash)
1292 return;
1293 mc_hash += ip_mc_hash(im);
1294 while ((aux = rtnl_dereference(*mc_hash)) != im)
1295 mc_hash = &aux->next_hash;
1296 *mc_hash = im->next_hash;
1297}
1298
1299
1300/*
1301 * A socket has joined a multicast group on device dev.
1302 */
1303
1304void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1305{
1306 struct ip_mc_list *im;
1307
1308 ASSERT_RTNL();
1309
1310 for_each_pmc_rtnl(in_dev, im) {
1311 if (im->multiaddr == addr) {
1312 im->users++;
1313 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1314 goto out;
1315 }
1316 }
1317
1318 im = kzalloc(sizeof(*im), GFP_KERNEL);
1319 if (!im)
1320 goto out;
1321
1322 im->users = 1;
1323 im->interface = in_dev;
1324 in_dev_hold(in_dev);
1325 im->multiaddr = addr;
1326 /* initial mode is (EX, empty) */
1327 im->sfmode = MCAST_EXCLUDE;
1328 im->sfcount[MCAST_EXCLUDE] = 1;
1329 atomic_set(&im->refcnt, 1);
1330 spin_lock_init(&im->lock);
1331#ifdef CONFIG_IP_MULTICAST
1332 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1333 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1334#endif
1335
1336 im->next_rcu = in_dev->mc_list;
1337 in_dev->mc_count++;
1338 rcu_assign_pointer(in_dev->mc_list, im);
1339
1340 ip_mc_hash_add(in_dev, im);
1341
1342#ifdef CONFIG_IP_MULTICAST
1343 igmpv3_del_delrec(in_dev, im->multiaddr);
1344#endif
1345 igmp_group_added(im);
1346 if (!in_dev->dead)
1347 ip_rt_multicast_event(in_dev);
1348out:
1349 return;
1350}
1351EXPORT_SYMBOL(ip_mc_inc_group);
1352
1353/*
1354 * Resend IGMP JOIN report; used by netdev notifier.
1355 */
1356static void ip_mc_rejoin_groups(struct in_device *in_dev)
1357{
1358#ifdef CONFIG_IP_MULTICAST
1359 struct ip_mc_list *im;
1360 int type;
1361
1362 ASSERT_RTNL();
1363
1364 for_each_pmc_rtnl(in_dev, im) {
1365 if (im->multiaddr == IGMP_ALL_HOSTS)
1366 continue;
1367
1368 /* a failover is happening and switches
1369 * must be notified immediately
1370 */
1371 if (IGMP_V1_SEEN(in_dev))
1372 type = IGMP_HOST_MEMBERSHIP_REPORT;
1373 else if (IGMP_V2_SEEN(in_dev))
1374 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1375 else
1376 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1377 igmp_send_report(in_dev, im, type);
1378 }
1379#endif
1380}
1381
1382/*
1383 * A socket has left a multicast group on device dev
1384 */
1385
1386void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1387{
1388 struct ip_mc_list *i;
1389 struct ip_mc_list __rcu **ip;
1390
1391 ASSERT_RTNL();
1392
1393 for (ip = &in_dev->mc_list;
1394 (i = rtnl_dereference(*ip)) != NULL;
1395 ip = &i->next_rcu) {
1396 if (i->multiaddr == addr) {
1397 if (--i->users == 0) {
1398 ip_mc_hash_remove(in_dev, i);
1399 *ip = i->next_rcu;
1400 in_dev->mc_count--;
1401 igmp_group_dropped(i);
1402 ip_mc_clear_src(i);
1403
1404 if (!in_dev->dead)
1405 ip_rt_multicast_event(in_dev);
1406
1407 ip_ma_put(i);
1408 return;
1409 }
1410 break;
1411 }
1412 }
1413}
1414EXPORT_SYMBOL(ip_mc_dec_group);
1415
1416/* Device changing type */
1417
1418void ip_mc_unmap(struct in_device *in_dev)
1419{
1420 struct ip_mc_list *pmc;
1421
1422 ASSERT_RTNL();
1423
1424 for_each_pmc_rtnl(in_dev, pmc)
1425 igmp_group_dropped(pmc);
1426}
1427
1428void ip_mc_remap(struct in_device *in_dev)
1429{
1430 struct ip_mc_list *pmc;
1431
1432 ASSERT_RTNL();
1433
1434 for_each_pmc_rtnl(in_dev, pmc)
1435 igmp_group_added(pmc);
1436}
1437
1438/* Device going down */
1439
1440void ip_mc_down(struct in_device *in_dev)
1441{
1442 struct ip_mc_list *pmc;
1443
1444 ASSERT_RTNL();
1445
1446 for_each_pmc_rtnl(in_dev, pmc)
1447 igmp_group_dropped(pmc);
1448
1449#ifdef CONFIG_IP_MULTICAST
1450 in_dev->mr_ifc_count = 0;
1451 if (del_timer(&in_dev->mr_ifc_timer))
1452 __in_dev_put(in_dev);
1453 in_dev->mr_gq_running = 0;
1454 if (del_timer(&in_dev->mr_gq_timer))
1455 __in_dev_put(in_dev);
1456 igmpv3_clear_delrec(in_dev);
1457#endif
1458
1459 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1460}
1461
1462void ip_mc_init_dev(struct in_device *in_dev)
1463{
1464 ASSERT_RTNL();
1465
1466#ifdef CONFIG_IP_MULTICAST
1467 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1468 (unsigned long)in_dev);
1469 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1470 (unsigned long)in_dev);
1471 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1472#endif
1473
1474 spin_lock_init(&in_dev->mc_tomb_lock);
1475}
1476
1477/* Device going up */
1478
1479void ip_mc_up(struct in_device *in_dev)
1480{
1481 struct ip_mc_list *pmc;
1482
1483 ASSERT_RTNL();
1484
1485 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1486
1487 for_each_pmc_rtnl(in_dev, pmc)
1488 igmp_group_added(pmc);
1489}
1490
1491/*
1492 * Device is about to be destroyed: clean up.
1493 */
1494
1495void ip_mc_destroy_dev(struct in_device *in_dev)
1496{
1497 struct ip_mc_list *i;
1498
1499 ASSERT_RTNL();
1500
1501 /* Deactivate timers */
1502 ip_mc_down(in_dev);
1503
1504 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1505 in_dev->mc_list = i->next_rcu;
1506 in_dev->mc_count--;
1507
1508 /* We've dropped the groups in ip_mc_down already */
1509 ip_mc_clear_src(i);
1510 ip_ma_put(i);
1511 }
1512}
1513
1514/* RTNL is locked */
1515static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1516{
1517 struct net_device *dev = NULL;
1518 struct in_device *idev = NULL;
1519
1520 if (imr->imr_ifindex) {
1521 idev = inetdev_by_index(net, imr->imr_ifindex);
1522 return idev;
1523 }
1524 if (imr->imr_address.s_addr) {
1525 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1526 if (!dev)
1527 return NULL;
1528 }
1529
1530 if (!dev) {
1531 struct rtable *rt = ip_route_output(net,
1532 imr->imr_multiaddr.s_addr,
1533 0, 0, 0);
1534 if (!IS_ERR(rt)) {
1535 dev = rt->dst.dev;
1536 ip_rt_put(rt);
1537 }
1538 }
1539 if (dev) {
1540 imr->imr_ifindex = dev->ifindex;
1541 idev = __in_dev_get_rtnl(dev);
1542 }
1543 return idev;
1544}
1545
1546/*
1547 * Join a socket to a group
1548 */
1549int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1550int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1551
1552
1553static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1554 __be32 *psfsrc)
1555{
1556 struct ip_sf_list *psf, *psf_prev;
1557 int rv = 0;
1558
1559 psf_prev = NULL;
1560 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1561 if (psf->sf_inaddr == *psfsrc)
1562 break;
1563 psf_prev = psf;
1564 }
1565 if (!psf || psf->sf_count[sfmode] == 0) {
1566 /* source filter not found, or count wrong => bug */
1567 return -ESRCH;
1568 }
1569 psf->sf_count[sfmode]--;
1570 if (psf->sf_count[sfmode] == 0) {
1571 ip_rt_multicast_event(pmc->interface);
1572 }
1573 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1574#ifdef CONFIG_IP_MULTICAST
1575 struct in_device *in_dev = pmc->interface;
1576#endif
1577
1578 /* no more filters for this source */
1579 if (psf_prev)
1580 psf_prev->sf_next = psf->sf_next;
1581 else
1582 pmc->sources = psf->sf_next;
1583#ifdef CONFIG_IP_MULTICAST
1584 if (psf->sf_oldin &&
1585 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1586 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1587 IGMP_Unsolicited_Report_Count;
1588 psf->sf_next = pmc->tomb;
1589 pmc->tomb = psf;
1590 rv = 1;
1591 } else
1592#endif
1593 kfree(psf);
1594 }
1595 return rv;
1596}
1597
1598#ifndef CONFIG_IP_MULTICAST
1599#define igmp_ifc_event(x) do { } while (0)
1600#endif
1601
1602static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1603 int sfcount, __be32 *psfsrc, int delta)
1604{
1605 struct ip_mc_list *pmc;
1606 int changerec = 0;
1607 int i, err;
1608
1609 if (!in_dev)
1610 return -ENODEV;
1611 rcu_read_lock();
1612 for_each_pmc_rcu(in_dev, pmc) {
1613 if (*pmca == pmc->multiaddr)
1614 break;
1615 }
1616 if (!pmc) {
1617 /* MCA not found?? bug */
1618 rcu_read_unlock();
1619 return -ESRCH;
1620 }
1621 spin_lock_bh(&pmc->lock);
1622 rcu_read_unlock();
1623#ifdef CONFIG_IP_MULTICAST
1624 sf_markstate(pmc);
1625#endif
1626 if (!delta) {
1627 err = -EINVAL;
1628 if (!pmc->sfcount[sfmode])
1629 goto out_unlock;
1630 pmc->sfcount[sfmode]--;
1631 }
1632 err = 0;
1633 for (i = 0; i < sfcount; i++) {
1634 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1635
1636 changerec |= rv > 0;
1637 if (!err && rv < 0)
1638 err = rv;
1639 }
1640 if (pmc->sfmode == MCAST_EXCLUDE &&
1641 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1642 pmc->sfcount[MCAST_INCLUDE]) {
1643#ifdef CONFIG_IP_MULTICAST
1644 struct ip_sf_list *psf;
1645#endif
1646
1647 /* filter mode change */
1648 pmc->sfmode = MCAST_INCLUDE;
1649#ifdef CONFIG_IP_MULTICAST
1650 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1651 IGMP_Unsolicited_Report_Count;
1652 in_dev->mr_ifc_count = pmc->crcount;
1653 for (psf = pmc->sources; psf; psf = psf->sf_next)
1654 psf->sf_crcount = 0;
1655 igmp_ifc_event(pmc->interface);
1656 } else if (sf_setstate(pmc) || changerec) {
1657 igmp_ifc_event(pmc->interface);
1658#endif
1659 }
1660out_unlock:
1661 spin_unlock_bh(&pmc->lock);
1662 return err;
1663}
1664
1665/*
1666 * Add multicast single-source filter to the interface list
1667 */
1668static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1669 __be32 *psfsrc)
1670{
1671 struct ip_sf_list *psf, *psf_prev;
1672
1673 psf_prev = NULL;
1674 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1675 if (psf->sf_inaddr == *psfsrc)
1676 break;
1677 psf_prev = psf;
1678 }
1679 if (!psf) {
1680 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1681 if (!psf)
1682 return -ENOBUFS;
1683 psf->sf_inaddr = *psfsrc;
1684 if (psf_prev) {
1685 psf_prev->sf_next = psf;
1686 } else
1687 pmc->sources = psf;
1688 }
1689 psf->sf_count[sfmode]++;
1690 if (psf->sf_count[sfmode] == 1) {
1691 ip_rt_multicast_event(pmc->interface);
1692 }
1693 return 0;
1694}
1695
1696#ifdef CONFIG_IP_MULTICAST
1697static void sf_markstate(struct ip_mc_list *pmc)
1698{
1699 struct ip_sf_list *psf;
1700 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1701
1702 for (psf = pmc->sources; psf; psf = psf->sf_next)
1703 if (pmc->sfcount[MCAST_EXCLUDE]) {
1704 psf->sf_oldin = mca_xcount ==
1705 psf->sf_count[MCAST_EXCLUDE] &&
1706 !psf->sf_count[MCAST_INCLUDE];
1707 } else
1708 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1709}
1710
1711static int sf_setstate(struct ip_mc_list *pmc)
1712{
1713 struct ip_sf_list *psf, *dpsf;
1714 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1715 int qrv = pmc->interface->mr_qrv;
1716 int new_in, rv;
1717
1718 rv = 0;
1719 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1720 if (pmc->sfcount[MCAST_EXCLUDE]) {
1721 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1722 !psf->sf_count[MCAST_INCLUDE];
1723 } else
1724 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1725 if (new_in) {
1726 if (!psf->sf_oldin) {
1727 struct ip_sf_list *prev = NULL;
1728
1729 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1730 if (dpsf->sf_inaddr == psf->sf_inaddr)
1731 break;
1732 prev = dpsf;
1733 }
1734 if (dpsf) {
1735 if (prev)
1736 prev->sf_next = dpsf->sf_next;
1737 else
1738 pmc->tomb = dpsf->sf_next;
1739 kfree(dpsf);
1740 }
1741 psf->sf_crcount = qrv;
1742 rv++;
1743 }
1744 } else if (psf->sf_oldin) {
1745
1746 psf->sf_crcount = 0;
1747 /*
1748 * add or update "delete" records if an active filter
1749 * is now inactive
1750 */
1751 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1752 if (dpsf->sf_inaddr == psf->sf_inaddr)
1753 break;
1754 if (!dpsf) {
1755 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1756 if (!dpsf)
1757 continue;
1758 *dpsf = *psf;
1759 /* pmc->lock held by callers */
1760 dpsf->sf_next = pmc->tomb;
1761 pmc->tomb = dpsf;
1762 }
1763 dpsf->sf_crcount = qrv;
1764 rv++;
1765 }
1766 }
1767 return rv;
1768}
1769#endif
1770
1771/*
1772 * Add multicast source filter list to the interface list
1773 */
1774static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1775 int sfcount, __be32 *psfsrc, int delta)
1776{
1777 struct ip_mc_list *pmc;
1778 int isexclude;
1779 int i, err;
1780
1781 if (!in_dev)
1782 return -ENODEV;
1783 rcu_read_lock();
1784 for_each_pmc_rcu(in_dev, pmc) {
1785 if (*pmca == pmc->multiaddr)
1786 break;
1787 }
1788 if (!pmc) {
1789 /* MCA not found?? bug */
1790 rcu_read_unlock();
1791 return -ESRCH;
1792 }
1793 spin_lock_bh(&pmc->lock);
1794 rcu_read_unlock();
1795
1796#ifdef CONFIG_IP_MULTICAST
1797 sf_markstate(pmc);
1798#endif
1799 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1800 if (!delta)
1801 pmc->sfcount[sfmode]++;
1802 err = 0;
1803 for (i = 0; i < sfcount; i++) {
1804 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1805 if (err)
1806 break;
1807 }
1808 if (err) {
1809 int j;
1810
1811 if (!delta)
1812 pmc->sfcount[sfmode]--;
1813 for (j = 0; j < i; j++)
1814 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1815 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1816#ifdef CONFIG_IP_MULTICAST
1817 struct ip_sf_list *psf;
1818 in_dev = pmc->interface;
1819#endif
1820
1821 /* filter mode change */
1822 if (pmc->sfcount[MCAST_EXCLUDE])
1823 pmc->sfmode = MCAST_EXCLUDE;
1824 else if (pmc->sfcount[MCAST_INCLUDE])
1825 pmc->sfmode = MCAST_INCLUDE;
1826#ifdef CONFIG_IP_MULTICAST
1827 /* else no filters; keep old mode for reports */
1828
1829 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1830 IGMP_Unsolicited_Report_Count;
1831 in_dev->mr_ifc_count = pmc->crcount;
1832 for (psf = pmc->sources; psf; psf = psf->sf_next)
1833 psf->sf_crcount = 0;
1834 igmp_ifc_event(in_dev);
1835 } else if (sf_setstate(pmc)) {
1836 igmp_ifc_event(in_dev);
1837#endif
1838 }
1839 spin_unlock_bh(&pmc->lock);
1840 return err;
1841}
1842
1843static void ip_mc_clear_src(struct ip_mc_list *pmc)
1844{
1845 struct ip_sf_list *psf, *nextpsf;
1846
1847 for (psf = pmc->tomb; psf; psf = nextpsf) {
1848 nextpsf = psf->sf_next;
1849 kfree(psf);
1850 }
1851 pmc->tomb = NULL;
1852 for (psf = pmc->sources; psf; psf = nextpsf) {
1853 nextpsf = psf->sf_next;
1854 kfree(psf);
1855 }
1856 pmc->sources = NULL;
1857 pmc->sfmode = MCAST_EXCLUDE;
1858 pmc->sfcount[MCAST_INCLUDE] = 0;
1859 pmc->sfcount[MCAST_EXCLUDE] = 1;
1860}
1861
1862
1863/*
1864 * Join a multicast group
1865 */
1866int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1867{
1868 int err;
1869 __be32 addr = imr->imr_multiaddr.s_addr;
1870 struct ip_mc_socklist *iml = NULL, *i;
1871 struct in_device *in_dev;
1872 struct inet_sock *inet = inet_sk(sk);
1873 struct net *net = sock_net(sk);
1874 int ifindex;
1875 int count = 0;
1876
1877 if (!ipv4_is_multicast(addr))
1878 return -EINVAL;
1879
1880 rtnl_lock();
1881
1882 in_dev = ip_mc_find_dev(net, imr);
1883
1884 if (!in_dev) {
1885 iml = NULL;
1886 err = -ENODEV;
1887 goto done;
1888 }
1889
1890 err = -EADDRINUSE;
1891 ifindex = imr->imr_ifindex;
1892 for_each_pmc_rtnl(inet, i) {
1893 if (i->multi.imr_multiaddr.s_addr == addr &&
1894 i->multi.imr_ifindex == ifindex)
1895 goto done;
1896 count++;
1897 }
1898 err = -ENOBUFS;
1899 if (count >= sysctl_igmp_max_memberships)
1900 goto done;
1901 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1902 if (iml == NULL)
1903 goto done;
1904
1905 memcpy(&iml->multi, imr, sizeof(*imr));
1906 iml->next_rcu = inet->mc_list;
1907 iml->sflist = NULL;
1908 iml->sfmode = MCAST_EXCLUDE;
1909 rcu_assign_pointer(inet->mc_list, iml);
1910 ip_mc_inc_group(in_dev, addr);
1911 err = 0;
1912done:
1913 rtnl_unlock();
1914 return err;
1915}
1916EXPORT_SYMBOL(ip_mc_join_group);
1917
1918static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1919 struct in_device *in_dev)
1920{
1921 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1922 int err;
1923
1924 if (psf == NULL) {
1925 /* any-source empty exclude case */
1926 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1927 iml->sfmode, 0, NULL, 0);
1928 }
1929 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1930 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1931 RCU_INIT_POINTER(iml->sflist, NULL);
1932 /* decrease mem now to avoid the memleak warning */
1933 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1934 kfree_rcu(psf, rcu);
1935 return err;
1936}
1937
1938/*
1939 * Ask a socket to leave a group.
1940 */
1941
1942int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1943{
1944 struct inet_sock *inet = inet_sk(sk);
1945 struct ip_mc_socklist *iml;
1946 struct ip_mc_socklist __rcu **imlp;
1947 struct in_device *in_dev;
1948 struct net *net = sock_net(sk);
1949 __be32 group = imr->imr_multiaddr.s_addr;
1950 u32 ifindex;
1951 int ret = -EADDRNOTAVAIL;
1952
1953 rtnl_lock();
1954 in_dev = ip_mc_find_dev(net, imr);
1955 ifindex = imr->imr_ifindex;
1956 for (imlp = &inet->mc_list;
1957 (iml = rtnl_dereference(*imlp)) != NULL;
1958 imlp = &iml->next_rcu) {
1959 if (iml->multi.imr_multiaddr.s_addr != group)
1960 continue;
1961 if (ifindex) {
1962 if (iml->multi.imr_ifindex != ifindex)
1963 continue;
1964 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1965 iml->multi.imr_address.s_addr)
1966 continue;
1967
1968 (void) ip_mc_leave_src(sk, iml, in_dev);
1969
1970 *imlp = iml->next_rcu;
1971
1972 if (in_dev)
1973 ip_mc_dec_group(in_dev, group);
1974 rtnl_unlock();
1975 /* decrease mem now to avoid the memleak warning */
1976 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1977 kfree_rcu(iml, rcu);
1978 return 0;
1979 }
1980 if (!in_dev)
1981 ret = -ENODEV;
1982 rtnl_unlock();
1983 return ret;
1984}
1985EXPORT_SYMBOL(ip_mc_leave_group);
1986
1987int ip_mc_source(int add, int omode, struct sock *sk, struct
1988 ip_mreq_source *mreqs, int ifindex)
1989{
1990 int err;
1991 struct ip_mreqn imr;
1992 __be32 addr = mreqs->imr_multiaddr;
1993 struct ip_mc_socklist *pmc;
1994 struct in_device *in_dev = NULL;
1995 struct inet_sock *inet = inet_sk(sk);
1996 struct ip_sf_socklist *psl;
1997 struct net *net = sock_net(sk);
1998 int leavegroup = 0;
1999 int i, j, rv;
2000
2001 if (!ipv4_is_multicast(addr))
2002 return -EINVAL;
2003
2004 rtnl_lock();
2005
2006 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2007 imr.imr_address.s_addr = mreqs->imr_interface;
2008 imr.imr_ifindex = ifindex;
2009 in_dev = ip_mc_find_dev(net, &imr);
2010
2011 if (!in_dev) {
2012 err = -ENODEV;
2013 goto done;
2014 }
2015 err = -EADDRNOTAVAIL;
2016
2017 for_each_pmc_rtnl(inet, pmc) {
2018 if ((pmc->multi.imr_multiaddr.s_addr ==
2019 imr.imr_multiaddr.s_addr) &&
2020 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2021 break;
2022 }
2023 if (!pmc) { /* must have a prior join */
2024 err = -EINVAL;
2025 goto done;
2026 }
2027 /* if a source filter was set, must be the same mode as before */
2028 if (pmc->sflist) {
2029 if (pmc->sfmode != omode) {
2030 err = -EINVAL;
2031 goto done;
2032 }
2033 } else if (pmc->sfmode != omode) {
2034 /* allow mode switches for empty-set filters */
2035 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2036 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2037 NULL, 0);
2038 pmc->sfmode = omode;
2039 }
2040
2041 psl = rtnl_dereference(pmc->sflist);
2042 if (!add) {
2043 if (!psl)
2044 goto done; /* err = -EADDRNOTAVAIL */
2045 rv = !0;
2046 for (i = 0; i < psl->sl_count; i++) {
2047 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2048 sizeof(__be32));
2049 if (rv == 0)
2050 break;
2051 }
2052 if (rv) /* source not found */
2053 goto done; /* err = -EADDRNOTAVAIL */
2054
2055 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2056 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2057 leavegroup = 1;
2058 goto done;
2059 }
2060
2061 /* update the interface filter */
2062 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2063 &mreqs->imr_sourceaddr, 1);
2064
2065 for (j = i+1; j < psl->sl_count; j++)
2066 psl->sl_addr[j-1] = psl->sl_addr[j];
2067 psl->sl_count--;
2068 err = 0;
2069 goto done;
2070 }
2071 /* else, add a new source to the filter */
2072
2073 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2074 err = -ENOBUFS;
2075 goto done;
2076 }
2077 if (!psl || psl->sl_count == psl->sl_max) {
2078 struct ip_sf_socklist *newpsl;
2079 int count = IP_SFBLOCK;
2080
2081 if (psl)
2082 count += psl->sl_max;
2083 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2084 if (!newpsl) {
2085 err = -ENOBUFS;
2086 goto done;
2087 }
2088 newpsl->sl_max = count;
2089 newpsl->sl_count = count - IP_SFBLOCK;
2090 if (psl) {
2091 for (i = 0; i < psl->sl_count; i++)
2092 newpsl->sl_addr[i] = psl->sl_addr[i];
2093 /* decrease mem now to avoid the memleak warning */
2094 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2095 kfree_rcu(psl, rcu);
2096 }
2097 rcu_assign_pointer(pmc->sflist, newpsl);
2098 psl = newpsl;
2099 }
2100 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2101 for (i = 0; i < psl->sl_count; i++) {
2102 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2103 sizeof(__be32));
2104 if (rv == 0)
2105 break;
2106 }
2107 if (rv == 0) /* address already there is an error */
2108 goto done;
2109 for (j = psl->sl_count-1; j >= i; j--)
2110 psl->sl_addr[j+1] = psl->sl_addr[j];
2111 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2112 psl->sl_count++;
2113 err = 0;
2114 /* update the interface list */
2115 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2116 &mreqs->imr_sourceaddr, 1);
2117done:
2118 rtnl_unlock();
2119 if (leavegroup)
2120 return ip_mc_leave_group(sk, &imr);
2121 return err;
2122}
2123
2124int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2125{
2126 int err = 0;
2127 struct ip_mreqn imr;
2128 __be32 addr = msf->imsf_multiaddr;
2129 struct ip_mc_socklist *pmc;
2130 struct in_device *in_dev;
2131 struct inet_sock *inet = inet_sk(sk);
2132 struct ip_sf_socklist *newpsl, *psl;
2133 struct net *net = sock_net(sk);
2134 int leavegroup = 0;
2135
2136 if (!ipv4_is_multicast(addr))
2137 return -EINVAL;
2138 if (msf->imsf_fmode != MCAST_INCLUDE &&
2139 msf->imsf_fmode != MCAST_EXCLUDE)
2140 return -EINVAL;
2141
2142 rtnl_lock();
2143
2144 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2145 imr.imr_address.s_addr = msf->imsf_interface;
2146 imr.imr_ifindex = ifindex;
2147 in_dev = ip_mc_find_dev(net, &imr);
2148
2149 if (!in_dev) {
2150 err = -ENODEV;
2151 goto done;
2152 }
2153
2154 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2155 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2156 leavegroup = 1;
2157 goto done;
2158 }
2159
2160 for_each_pmc_rtnl(inet, pmc) {
2161 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2162 pmc->multi.imr_ifindex == imr.imr_ifindex)
2163 break;
2164 }
2165 if (!pmc) { /* must have a prior join */
2166 err = -EINVAL;
2167 goto done;
2168 }
2169 if (msf->imsf_numsrc) {
2170 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2171 GFP_KERNEL);
2172 if (!newpsl) {
2173 err = -ENOBUFS;
2174 goto done;
2175 }
2176 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2177 memcpy(newpsl->sl_addr, msf->imsf_slist,
2178 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2179 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2180 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2181 if (err) {
2182 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2183 goto done;
2184 }
2185 } else {
2186 newpsl = NULL;
2187 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2188 msf->imsf_fmode, 0, NULL, 0);
2189 }
2190 psl = rtnl_dereference(pmc->sflist);
2191 if (psl) {
2192 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2193 psl->sl_count, psl->sl_addr, 0);
2194 /* decrease mem now to avoid the memleak warning */
2195 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2196 kfree_rcu(psl, rcu);
2197 } else
2198 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2199 0, NULL, 0);
2200 rcu_assign_pointer(pmc->sflist, newpsl);
2201 pmc->sfmode = msf->imsf_fmode;
2202 err = 0;
2203done:
2204 rtnl_unlock();
2205 if (leavegroup)
2206 err = ip_mc_leave_group(sk, &imr);
2207 return err;
2208}
2209
2210int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2211 struct ip_msfilter __user *optval, int __user *optlen)
2212{
2213 int err, len, count, copycount;
2214 struct ip_mreqn imr;
2215 __be32 addr = msf->imsf_multiaddr;
2216 struct ip_mc_socklist *pmc;
2217 struct in_device *in_dev;
2218 struct inet_sock *inet = inet_sk(sk);
2219 struct ip_sf_socklist *psl;
2220 struct net *net = sock_net(sk);
2221
2222 if (!ipv4_is_multicast(addr))
2223 return -EINVAL;
2224
2225 rtnl_lock();
2226
2227 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2228 imr.imr_address.s_addr = msf->imsf_interface;
2229 imr.imr_ifindex = 0;
2230 in_dev = ip_mc_find_dev(net, &imr);
2231
2232 if (!in_dev) {
2233 err = -ENODEV;
2234 goto done;
2235 }
2236 err = -EADDRNOTAVAIL;
2237
2238 for_each_pmc_rtnl(inet, pmc) {
2239 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2240 pmc->multi.imr_ifindex == imr.imr_ifindex)
2241 break;
2242 }
2243 if (!pmc) /* must have a prior join */
2244 goto done;
2245 msf->imsf_fmode = pmc->sfmode;
2246 psl = rtnl_dereference(pmc->sflist);
2247 rtnl_unlock();
2248 if (!psl) {
2249 len = 0;
2250 count = 0;
2251 } else {
2252 count = psl->sl_count;
2253 }
2254 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2255 len = copycount * sizeof(psl->sl_addr[0]);
2256 msf->imsf_numsrc = count;
2257 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2258 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2259 return -EFAULT;
2260 }
2261 if (len &&
2262 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2263 return -EFAULT;
2264 return 0;
2265done:
2266 rtnl_unlock();
2267 return err;
2268}
2269
2270int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2271 struct group_filter __user *optval, int __user *optlen)
2272{
2273 int err, i, count, copycount;
2274 struct sockaddr_in *psin;
2275 __be32 addr;
2276 struct ip_mc_socklist *pmc;
2277 struct inet_sock *inet = inet_sk(sk);
2278 struct ip_sf_socklist *psl;
2279
2280 psin = (struct sockaddr_in *)&gsf->gf_group;
2281 if (psin->sin_family != AF_INET)
2282 return -EINVAL;
2283 addr = psin->sin_addr.s_addr;
2284 if (!ipv4_is_multicast(addr))
2285 return -EINVAL;
2286
2287 rtnl_lock();
2288
2289 err = -EADDRNOTAVAIL;
2290
2291 for_each_pmc_rtnl(inet, pmc) {
2292 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2293 pmc->multi.imr_ifindex == gsf->gf_interface)
2294 break;
2295 }
2296 if (!pmc) /* must have a prior join */
2297 goto done;
2298 gsf->gf_fmode = pmc->sfmode;
2299 psl = rtnl_dereference(pmc->sflist);
2300 rtnl_unlock();
2301 count = psl ? psl->sl_count : 0;
2302 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2303 gsf->gf_numsrc = count;
2304 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2305 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2306 return -EFAULT;
2307 }
2308 for (i = 0; i < copycount; i++) {
2309 struct sockaddr_storage ss;
2310
2311 psin = (struct sockaddr_in *)&ss;
2312 memset(&ss, 0, sizeof(ss));
2313 psin->sin_family = AF_INET;
2314 psin->sin_addr.s_addr = psl->sl_addr[i];
2315 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2316 return -EFAULT;
2317 }
2318 return 0;
2319done:
2320 rtnl_unlock();
2321 return err;
2322}
2323
2324/*
2325 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2326 */
2327int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2328{
2329 struct inet_sock *inet = inet_sk(sk);
2330 struct ip_mc_socklist *pmc;
2331 struct ip_sf_socklist *psl;
2332 int i;
2333 int ret;
2334
2335 ret = 1;
2336 if (!ipv4_is_multicast(loc_addr))
2337 goto out;
2338
2339 rcu_read_lock();
2340 for_each_pmc_rcu(inet, pmc) {
2341 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2342 pmc->multi.imr_ifindex == dif)
2343 break;
2344 }
2345 ret = inet->mc_all;
2346 if (!pmc)
2347 goto unlock;
2348 psl = rcu_dereference(pmc->sflist);
2349 ret = (pmc->sfmode == MCAST_EXCLUDE);
2350 if (!psl)
2351 goto unlock;
2352
2353 for (i = 0; i < psl->sl_count; i++) {
2354 if (psl->sl_addr[i] == rmt_addr)
2355 break;
2356 }
2357 ret = 0;
2358 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2359 goto unlock;
2360 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2361 goto unlock;
2362 ret = 1;
2363unlock:
2364 rcu_read_unlock();
2365out:
2366 return ret;
2367}
2368
2369/*
2370 * A socket is closing.
2371 */
2372
2373void ip_mc_drop_socket(struct sock *sk)
2374{
2375 struct inet_sock *inet = inet_sk(sk);
2376 struct ip_mc_socklist *iml;
2377 struct net *net = sock_net(sk);
2378
2379 if (inet->mc_list == NULL)
2380 return;
2381
2382 rtnl_lock();
2383 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2384 struct in_device *in_dev;
2385
2386 inet->mc_list = iml->next_rcu;
2387 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2388 (void) ip_mc_leave_src(sk, iml, in_dev);
2389 if (in_dev != NULL)
2390 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2391 /* decrease mem now to avoid the memleak warning */
2392 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2393 kfree_rcu(iml, rcu);
2394 }
2395 rtnl_unlock();
2396}
2397
2398/* called with rcu_read_lock() */
2399int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2400{
2401 struct ip_mc_list *im;
2402 struct ip_mc_list __rcu **mc_hash;
2403 struct ip_sf_list *psf;
2404 int rv = 0;
2405
2406 mc_hash = rcu_dereference(in_dev->mc_hash);
2407 if (mc_hash) {
2408 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2409
2410 for (im = rcu_dereference(mc_hash[hash]);
2411 im != NULL;
2412 im = rcu_dereference(im->next_hash)) {
2413 if (im->multiaddr == mc_addr)
2414 break;
2415 }
2416 } else {
2417 for_each_pmc_rcu(in_dev, im) {
2418 if (im->multiaddr == mc_addr)
2419 break;
2420 }
2421 }
2422 if (im && proto == IPPROTO_IGMP) {
2423 rv = 1;
2424 } else if (im) {
2425 if (src_addr) {
2426 for (psf = im->sources; psf; psf = psf->sf_next) {
2427 if (psf->sf_inaddr == src_addr)
2428 break;
2429 }
2430 if (psf)
2431 rv = psf->sf_count[MCAST_INCLUDE] ||
2432 psf->sf_count[MCAST_EXCLUDE] !=
2433 im->sfcount[MCAST_EXCLUDE];
2434 else
2435 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2436 } else
2437 rv = 1; /* unspecified source; tentatively allow */
2438 }
2439 return rv;
2440}
2441
2442#if defined(CONFIG_PROC_FS)
2443struct igmp_mc_iter_state {
2444 struct seq_net_private p;
2445 struct net_device *dev;
2446 struct in_device *in_dev;
2447};
2448
2449#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2450
2451static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2452{
2453 struct net *net = seq_file_net(seq);
2454 struct ip_mc_list *im = NULL;
2455 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2456
2457 state->in_dev = NULL;
2458 for_each_netdev_rcu(net, state->dev) {
2459 struct in_device *in_dev;
2460
2461 in_dev = __in_dev_get_rcu(state->dev);
2462 if (!in_dev)
2463 continue;
2464 im = rcu_dereference(in_dev->mc_list);
2465 if (im) {
2466 state->in_dev = in_dev;
2467 break;
2468 }
2469 }
2470 return im;
2471}
2472
2473static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2474{
2475 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2476
2477 im = rcu_dereference(im->next_rcu);
2478 while (!im) {
2479 state->dev = next_net_device_rcu(state->dev);
2480 if (!state->dev) {
2481 state->in_dev = NULL;
2482 break;
2483 }
2484 state->in_dev = __in_dev_get_rcu(state->dev);
2485 if (!state->in_dev)
2486 continue;
2487 im = rcu_dereference(state->in_dev->mc_list);
2488 }
2489 return im;
2490}
2491
2492static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2493{
2494 struct ip_mc_list *im = igmp_mc_get_first(seq);
2495 if (im)
2496 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2497 --pos;
2498 return pos ? NULL : im;
2499}
2500
2501static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2502 __acquires(rcu)
2503{
2504 rcu_read_lock();
2505 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2506}
2507
2508static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2509{
2510 struct ip_mc_list *im;
2511 if (v == SEQ_START_TOKEN)
2512 im = igmp_mc_get_first(seq);
2513 else
2514 im = igmp_mc_get_next(seq, v);
2515 ++*pos;
2516 return im;
2517}
2518
2519static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2520 __releases(rcu)
2521{
2522 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2523
2524 state->in_dev = NULL;
2525 state->dev = NULL;
2526 rcu_read_unlock();
2527}
2528
2529static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2530{
2531 if (v == SEQ_START_TOKEN)
2532 seq_puts(seq,
2533 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2534 else {
2535 struct ip_mc_list *im = (struct ip_mc_list *)v;
2536 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2537 char *querier;
2538 long delta;
2539
2540#ifdef CONFIG_IP_MULTICAST
2541 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2542 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2543 "V3";
2544#else
2545 querier = "NONE";
2546#endif
2547
2548 if (rcu_dereference(state->in_dev->mc_list) == im) {
2549 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2550 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2551 }
2552
2553 delta = im->timer.expires - jiffies;
2554 seq_printf(seq,
2555 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2556 im->multiaddr, im->users,
2557 im->tm_running,
2558 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2559 im->reporter);
2560 }
2561 return 0;
2562}
2563
2564static const struct seq_operations igmp_mc_seq_ops = {
2565 .start = igmp_mc_seq_start,
2566 .next = igmp_mc_seq_next,
2567 .stop = igmp_mc_seq_stop,
2568 .show = igmp_mc_seq_show,
2569};
2570
2571static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2572{
2573 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2574 sizeof(struct igmp_mc_iter_state));
2575}
2576
2577static const struct file_operations igmp_mc_seq_fops = {
2578 .owner = THIS_MODULE,
2579 .open = igmp_mc_seq_open,
2580 .read = seq_read,
2581 .llseek = seq_lseek,
2582 .release = seq_release_net,
2583};
2584
2585struct igmp_mcf_iter_state {
2586 struct seq_net_private p;
2587 struct net_device *dev;
2588 struct in_device *idev;
2589 struct ip_mc_list *im;
2590};
2591
2592#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2593
2594static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2595{
2596 struct net *net = seq_file_net(seq);
2597 struct ip_sf_list *psf = NULL;
2598 struct ip_mc_list *im = NULL;
2599 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2600
2601 state->idev = NULL;
2602 state->im = NULL;
2603 for_each_netdev_rcu(net, state->dev) {
2604 struct in_device *idev;
2605 idev = __in_dev_get_rcu(state->dev);
2606 if (unlikely(idev == NULL))
2607 continue;
2608 im = rcu_dereference(idev->mc_list);
2609 if (likely(im != NULL)) {
2610 spin_lock_bh(&im->lock);
2611 psf = im->sources;
2612 if (likely(psf != NULL)) {
2613 state->im = im;
2614 state->idev = idev;
2615 break;
2616 }
2617 spin_unlock_bh(&im->lock);
2618 }
2619 }
2620 return psf;
2621}
2622
2623static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2624{
2625 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2626
2627 psf = psf->sf_next;
2628 while (!psf) {
2629 spin_unlock_bh(&state->im->lock);
2630 state->im = state->im->next;
2631 while (!state->im) {
2632 state->dev = next_net_device_rcu(state->dev);
2633 if (!state->dev) {
2634 state->idev = NULL;
2635 goto out;
2636 }
2637 state->idev = __in_dev_get_rcu(state->dev);
2638 if (!state->idev)
2639 continue;
2640 state->im = rcu_dereference(state->idev->mc_list);
2641 }
2642 if (!state->im)
2643 break;
2644 spin_lock_bh(&state->im->lock);
2645 psf = state->im->sources;
2646 }
2647out:
2648 return psf;
2649}
2650
2651static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2652{
2653 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2654 if (psf)
2655 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2656 --pos;
2657 return pos ? NULL : psf;
2658}
2659
2660static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2661 __acquires(rcu)
2662{
2663 rcu_read_lock();
2664 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2665}
2666
2667static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2668{
2669 struct ip_sf_list *psf;
2670 if (v == SEQ_START_TOKEN)
2671 psf = igmp_mcf_get_first(seq);
2672 else
2673 psf = igmp_mcf_get_next(seq, v);
2674 ++*pos;
2675 return psf;
2676}
2677
2678static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2679 __releases(rcu)
2680{
2681 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2682 if (likely(state->im != NULL)) {
2683 spin_unlock_bh(&state->im->lock);
2684 state->im = NULL;
2685 }
2686 state->idev = NULL;
2687 state->dev = NULL;
2688 rcu_read_unlock();
2689}
2690
2691static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2692{
2693 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2694 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2695
2696 if (v == SEQ_START_TOKEN) {
2697 seq_printf(seq,
2698 "%3s %6s "
2699 "%10s %10s %6s %6s\n", "Idx",
2700 "Device", "MCA",
2701 "SRC", "INC", "EXC");
2702 } else {
2703 seq_printf(seq,
2704 "%3d %6.6s 0x%08x "
2705 "0x%08x %6lu %6lu\n",
2706 state->dev->ifindex, state->dev->name,
2707 ntohl(state->im->multiaddr),
2708 ntohl(psf->sf_inaddr),
2709 psf->sf_count[MCAST_INCLUDE],
2710 psf->sf_count[MCAST_EXCLUDE]);
2711 }
2712 return 0;
2713}
2714
2715static const struct seq_operations igmp_mcf_seq_ops = {
2716 .start = igmp_mcf_seq_start,
2717 .next = igmp_mcf_seq_next,
2718 .stop = igmp_mcf_seq_stop,
2719 .show = igmp_mcf_seq_show,
2720};
2721
2722static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2723{
2724 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2725 sizeof(struct igmp_mcf_iter_state));
2726}
2727
2728static const struct file_operations igmp_mcf_seq_fops = {
2729 .owner = THIS_MODULE,
2730 .open = igmp_mcf_seq_open,
2731 .read = seq_read,
2732 .llseek = seq_lseek,
2733 .release = seq_release_net,
2734};
2735
2736static int __net_init igmp_net_init(struct net *net)
2737{
2738 struct proc_dir_entry *pde;
2739
2740 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2741 if (!pde)
2742 goto out_igmp;
2743 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2744 &igmp_mcf_seq_fops);
2745 if (!pde)
2746 goto out_mcfilter;
2747 return 0;
2748
2749out_mcfilter:
2750 remove_proc_entry("igmp", net->proc_net);
2751out_igmp:
2752 return -ENOMEM;
2753}
2754
2755static void __net_exit igmp_net_exit(struct net *net)
2756{
2757 remove_proc_entry("mcfilter", net->proc_net);
2758 remove_proc_entry("igmp", net->proc_net);
2759}
2760
2761static struct pernet_operations igmp_net_ops = {
2762 .init = igmp_net_init,
2763 .exit = igmp_net_exit,
2764};
2765#endif
2766
2767static int igmp_netdev_event(struct notifier_block *this,
2768 unsigned long event, void *ptr)
2769{
2770 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2771 struct in_device *in_dev;
2772
2773 switch (event) {
2774 case NETDEV_RESEND_IGMP:
2775 in_dev = __in_dev_get_rtnl(dev);
2776 if (in_dev)
2777 ip_mc_rejoin_groups(in_dev);
2778 break;
2779 default:
2780 break;
2781 }
2782 return NOTIFY_DONE;
2783}
2784
2785static struct notifier_block igmp_notifier = {
2786 .notifier_call = igmp_netdev_event,
2787};
2788
2789int __init igmp_mc_init(void)
2790{
2791#if defined(CONFIG_PROC_FS)
2792 int err;
2793
2794 err = register_pernet_subsys(&igmp_net_ops);
2795 if (err)
2796 return err;
2797 err = register_netdevice_notifier(&igmp_notifier);
2798 if (err)
2799 goto reg_notif_fail;
2800 return 0;
2801
2802reg_notif_fail:
2803 unregister_pernet_subsys(&igmp_net_ops);
2804 return err;
2805#else
2806 return register_netdevice_notifier(&igmp_notifier);
2807#endif
2808}