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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 <linux/uaccess.h>
76 #include <linux/types.h>
77 #include <linux/kernel.h>
78 #include <linux/jiffies.h>
79 #include <linux/string.h>
80 #include <linux/socket.h>
81 #include <linux/sockios.h>
82 #include <linux/in.h>
83 #include <linux/inet.h>
84 #include <linux/netdevice.h>
85 #include <linux/skbuff.h>
86 #include <linux/inetdevice.h>
87 #include <linux/igmp.h>
88 #include <linux/if_arp.h>
89 #include <linux/rtnetlink.h>
90 #include <linux/times.h>
91 #include <linux/pkt_sched.h>
92
93 #include <net/net_namespace.h>
94 #include <net/arp.h>
95 #include <net/ip.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
98 #include <net/sock.h>
99 #include <net/checksum.h>
100 #include <net/inet_common.h>
101 #include <linux/netfilter_ipv4.h>
102 #ifdef CONFIG_IP_MROUTE
103 #include <linux/mroute.h>
104 #endif
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
108 #endif
109
110 #ifdef CONFIG_IP_MULTICAST
111 /* Parameter names and values are taken from igmp-v2-06 draft */
112
113 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
114 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
115 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
116 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
117 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
118 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
119
120
121 #define IGMP_INITIAL_REPORT_DELAY (1)
122
123 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
128 */
129
130 #define IGMP_V1_SEEN(in_dev) \
131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135 #define IGMP_V2_SEEN(in_dev) \
136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
140
141 static int unsolicited_report_interval(struct in_device *in_dev)
142 {
143 int interval_ms, interval_jiffies;
144
145 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
146 interval_ms = IN_DEV_CONF_GET(
147 in_dev,
148 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
149 else /* v3 */
150 interval_ms = IN_DEV_CONF_GET(
151 in_dev,
152 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
153
154 interval_jiffies = msecs_to_jiffies(interval_ms);
155
156 /* _timer functions can't handle a delay of 0 jiffies so ensure
157 * we always return a positive value.
158 */
159 if (interval_jiffies <= 0)
160 interval_jiffies = 1;
161 return interval_jiffies;
162 }
163
164 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
165 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
166 static void igmpv3_clear_delrec(struct in_device *in_dev);
167 static int sf_setstate(struct ip_mc_list *pmc);
168 static void sf_markstate(struct ip_mc_list *pmc);
169 #endif
170 static void ip_mc_clear_src(struct ip_mc_list *pmc);
171 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
172 int sfcount, __be32 *psfsrc, int delta);
173
174 static void ip_ma_put(struct ip_mc_list *im)
175 {
176 if (atomic_dec_and_test(&im->refcnt)) {
177 in_dev_put(im->interface);
178 kfree_rcu(im, rcu);
179 }
180 }
181
182 #define for_each_pmc_rcu(in_dev, pmc) \
183 for (pmc = rcu_dereference(in_dev->mc_list); \
184 pmc != NULL; \
185 pmc = rcu_dereference(pmc->next_rcu))
186
187 #define for_each_pmc_rtnl(in_dev, pmc) \
188 for (pmc = rtnl_dereference(in_dev->mc_list); \
189 pmc != NULL; \
190 pmc = rtnl_dereference(pmc->next_rcu))
191
192 #ifdef CONFIG_IP_MULTICAST
193
194 /*
195 * Timer management
196 */
197
198 static void igmp_stop_timer(struct ip_mc_list *im)
199 {
200 spin_lock_bh(&im->lock);
201 if (del_timer(&im->timer))
202 atomic_dec(&im->refcnt);
203 im->tm_running = 0;
204 im->reporter = 0;
205 im->unsolicit_count = 0;
206 spin_unlock_bh(&im->lock);
207 }
208
209 /* It must be called with locked im->lock */
210 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
211 {
212 int tv = prandom_u32() % max_delay;
213
214 im->tm_running = 1;
215 if (!mod_timer(&im->timer, jiffies+tv+2))
216 atomic_inc(&im->refcnt);
217 }
218
219 static void igmp_gq_start_timer(struct in_device *in_dev)
220 {
221 int tv = prandom_u32() % in_dev->mr_maxdelay;
222 unsigned long exp = jiffies + tv + 2;
223
224 if (in_dev->mr_gq_running &&
225 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
226 return;
227
228 in_dev->mr_gq_running = 1;
229 if (!mod_timer(&in_dev->mr_gq_timer, exp))
230 in_dev_hold(in_dev);
231 }
232
233 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
234 {
235 int tv = prandom_u32() % delay;
236
237 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
238 in_dev_hold(in_dev);
239 }
240
241 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
242 {
243 spin_lock_bh(&im->lock);
244 im->unsolicit_count = 0;
245 if (del_timer(&im->timer)) {
246 if ((long)(im->timer.expires-jiffies) < max_delay) {
247 add_timer(&im->timer);
248 im->tm_running = 1;
249 spin_unlock_bh(&im->lock);
250 return;
251 }
252 atomic_dec(&im->refcnt);
253 }
254 igmp_start_timer(im, max_delay);
255 spin_unlock_bh(&im->lock);
256 }
257
258
259 /*
260 * Send an IGMP report.
261 */
262
263 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
264
265
266 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
267 int gdeleted, int sdeleted)
268 {
269 switch (type) {
270 case IGMPV3_MODE_IS_INCLUDE:
271 case IGMPV3_MODE_IS_EXCLUDE:
272 if (gdeleted || sdeleted)
273 return 0;
274 if (!(pmc->gsquery && !psf->sf_gsresp)) {
275 if (pmc->sfmode == MCAST_INCLUDE)
276 return 1;
277 /* don't include if this source is excluded
278 * in all filters
279 */
280 if (psf->sf_count[MCAST_INCLUDE])
281 return type == IGMPV3_MODE_IS_INCLUDE;
282 return pmc->sfcount[MCAST_EXCLUDE] ==
283 psf->sf_count[MCAST_EXCLUDE];
284 }
285 return 0;
286 case IGMPV3_CHANGE_TO_INCLUDE:
287 if (gdeleted || sdeleted)
288 return 0;
289 return psf->sf_count[MCAST_INCLUDE] != 0;
290 case IGMPV3_CHANGE_TO_EXCLUDE:
291 if (gdeleted || sdeleted)
292 return 0;
293 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
294 psf->sf_count[MCAST_INCLUDE])
295 return 0;
296 return pmc->sfcount[MCAST_EXCLUDE] ==
297 psf->sf_count[MCAST_EXCLUDE];
298 case IGMPV3_ALLOW_NEW_SOURCES:
299 if (gdeleted || !psf->sf_crcount)
300 return 0;
301 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
302 case IGMPV3_BLOCK_OLD_SOURCES:
303 if (pmc->sfmode == MCAST_INCLUDE)
304 return gdeleted || (psf->sf_crcount && sdeleted);
305 return psf->sf_crcount && !gdeleted && !sdeleted;
306 }
307 return 0;
308 }
309
310 static int
311 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
312 {
313 struct ip_sf_list *psf;
314 int scount = 0;
315
316 for (psf = pmc->sources; psf; psf = psf->sf_next) {
317 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
318 continue;
319 scount++;
320 }
321 return scount;
322 }
323
324 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
325 {
326 struct sk_buff *skb;
327 struct rtable *rt;
328 struct iphdr *pip;
329 struct igmpv3_report *pig;
330 struct net *net = dev_net(dev);
331 struct flowi4 fl4;
332 int hlen = LL_RESERVED_SPACE(dev);
333 int tlen = dev->needed_tailroom;
334 unsigned int size = mtu;
335
336 while (1) {
337 skb = alloc_skb(size + hlen + tlen,
338 GFP_ATOMIC | __GFP_NOWARN);
339 if (skb)
340 break;
341 size >>= 1;
342 if (size < 256)
343 return NULL;
344 }
345 skb->priority = TC_PRIO_CONTROL;
346
347 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
348 0, 0,
349 IPPROTO_IGMP, 0, dev->ifindex);
350 if (IS_ERR(rt)) {
351 kfree_skb(skb);
352 return NULL;
353 }
354
355 skb_dst_set(skb, &rt->dst);
356 skb->dev = dev;
357
358 skb_reserve(skb, hlen);
359 skb_tailroom_reserve(skb, mtu, tlen);
360
361 skb_reset_network_header(skb);
362 pip = ip_hdr(skb);
363 skb_put(skb, sizeof(struct iphdr) + 4);
364
365 pip->version = 4;
366 pip->ihl = (sizeof(struct iphdr)+4)>>2;
367 pip->tos = 0xc0;
368 pip->frag_off = htons(IP_DF);
369 pip->ttl = 1;
370 pip->daddr = fl4.daddr;
371 pip->saddr = fl4.saddr;
372 pip->protocol = IPPROTO_IGMP;
373 pip->tot_len = 0; /* filled in later */
374 ip_select_ident(net, skb, NULL);
375 ((u8 *)&pip[1])[0] = IPOPT_RA;
376 ((u8 *)&pip[1])[1] = 4;
377 ((u8 *)&pip[1])[2] = 0;
378 ((u8 *)&pip[1])[3] = 0;
379
380 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
381 skb_put(skb, sizeof(*pig));
382 pig = igmpv3_report_hdr(skb);
383 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
384 pig->resv1 = 0;
385 pig->csum = 0;
386 pig->resv2 = 0;
387 pig->ngrec = 0;
388 return skb;
389 }
390
391 static int igmpv3_sendpack(struct sk_buff *skb)
392 {
393 struct igmphdr *pig = igmp_hdr(skb);
394 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
395
396 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
397
398 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
399 }
400
401 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
402 {
403 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
404 }
405
406 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
407 int type, struct igmpv3_grec **ppgr)
408 {
409 struct net_device *dev = pmc->interface->dev;
410 struct igmpv3_report *pih;
411 struct igmpv3_grec *pgr;
412
413 if (!skb)
414 skb = igmpv3_newpack(dev, dev->mtu);
415 if (!skb)
416 return NULL;
417 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
418 pgr->grec_type = type;
419 pgr->grec_auxwords = 0;
420 pgr->grec_nsrcs = 0;
421 pgr->grec_mca = pmc->multiaddr;
422 pih = igmpv3_report_hdr(skb);
423 pih->ngrec = htons(ntohs(pih->ngrec)+1);
424 *ppgr = pgr;
425 return skb;
426 }
427
428 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
429
430 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
431 int type, int gdeleted, int sdeleted)
432 {
433 struct net_device *dev = pmc->interface->dev;
434 struct net *net = dev_net(dev);
435 struct igmpv3_report *pih;
436 struct igmpv3_grec *pgr = NULL;
437 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
438 int scount, stotal, first, isquery, truncate;
439
440 if (pmc->multiaddr == IGMP_ALL_HOSTS)
441 return skb;
442 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
443 return skb;
444
445 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
446 type == IGMPV3_MODE_IS_EXCLUDE;
447 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
448 type == IGMPV3_CHANGE_TO_EXCLUDE;
449
450 stotal = scount = 0;
451
452 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
453
454 if (!*psf_list)
455 goto empty_source;
456
457 pih = skb ? igmpv3_report_hdr(skb) : NULL;
458
459 /* EX and TO_EX get a fresh packet, if needed */
460 if (truncate) {
461 if (pih && pih->ngrec &&
462 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
463 if (skb)
464 igmpv3_sendpack(skb);
465 skb = igmpv3_newpack(dev, dev->mtu);
466 }
467 }
468 first = 1;
469 psf_prev = NULL;
470 for (psf = *psf_list; psf; psf = psf_next) {
471 __be32 *psrc;
472
473 psf_next = psf->sf_next;
474
475 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
476 psf_prev = psf;
477 continue;
478 }
479
480 /* Based on RFC3376 5.1. Should not send source-list change
481 * records when there is a filter mode change.
482 */
483 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
484 (!gdeleted && pmc->crcount)) &&
485 (type == IGMPV3_ALLOW_NEW_SOURCES ||
486 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
487 goto decrease_sf_crcount;
488
489 /* clear marks on query responses */
490 if (isquery)
491 psf->sf_gsresp = 0;
492
493 if (AVAILABLE(skb) < sizeof(__be32) +
494 first*sizeof(struct igmpv3_grec)) {
495 if (truncate && !first)
496 break; /* truncate these */
497 if (pgr)
498 pgr->grec_nsrcs = htons(scount);
499 if (skb)
500 igmpv3_sendpack(skb);
501 skb = igmpv3_newpack(dev, dev->mtu);
502 first = 1;
503 scount = 0;
504 }
505 if (first) {
506 skb = add_grhead(skb, pmc, type, &pgr);
507 first = 0;
508 }
509 if (!skb)
510 return NULL;
511 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
512 *psrc = psf->sf_inaddr;
513 scount++; stotal++;
514 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
515 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
516 decrease_sf_crcount:
517 psf->sf_crcount--;
518 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
519 if (psf_prev)
520 psf_prev->sf_next = psf->sf_next;
521 else
522 *psf_list = psf->sf_next;
523 kfree(psf);
524 continue;
525 }
526 }
527 psf_prev = psf;
528 }
529
530 empty_source:
531 if (!stotal) {
532 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
533 type == IGMPV3_BLOCK_OLD_SOURCES)
534 return skb;
535 if (pmc->crcount || isquery) {
536 /* make sure we have room for group header */
537 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
538 igmpv3_sendpack(skb);
539 skb = NULL; /* add_grhead will get a new one */
540 }
541 skb = add_grhead(skb, pmc, type, &pgr);
542 }
543 }
544 if (pgr)
545 pgr->grec_nsrcs = htons(scount);
546
547 if (isquery)
548 pmc->gsquery = 0; /* clear query state on report */
549 return skb;
550 }
551
552 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
553 {
554 struct sk_buff *skb = NULL;
555 struct net *net = dev_net(in_dev->dev);
556 int type;
557
558 if (!pmc) {
559 rcu_read_lock();
560 for_each_pmc_rcu(in_dev, pmc) {
561 if (pmc->multiaddr == IGMP_ALL_HOSTS)
562 continue;
563 if (ipv4_is_local_multicast(pmc->multiaddr) &&
564 !net->ipv4.sysctl_igmp_llm_reports)
565 continue;
566 spin_lock_bh(&pmc->lock);
567 if (pmc->sfcount[MCAST_EXCLUDE])
568 type = IGMPV3_MODE_IS_EXCLUDE;
569 else
570 type = IGMPV3_MODE_IS_INCLUDE;
571 skb = add_grec(skb, pmc, type, 0, 0);
572 spin_unlock_bh(&pmc->lock);
573 }
574 rcu_read_unlock();
575 } else {
576 spin_lock_bh(&pmc->lock);
577 if (pmc->sfcount[MCAST_EXCLUDE])
578 type = IGMPV3_MODE_IS_EXCLUDE;
579 else
580 type = IGMPV3_MODE_IS_INCLUDE;
581 skb = add_grec(skb, pmc, type, 0, 0);
582 spin_unlock_bh(&pmc->lock);
583 }
584 if (!skb)
585 return 0;
586 return igmpv3_sendpack(skb);
587 }
588
589 /*
590 * remove zero-count source records from a source filter list
591 */
592 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
593 {
594 struct ip_sf_list *psf_prev, *psf_next, *psf;
595
596 psf_prev = NULL;
597 for (psf = *ppsf; psf; psf = psf_next) {
598 psf_next = psf->sf_next;
599 if (psf->sf_crcount == 0) {
600 if (psf_prev)
601 psf_prev->sf_next = psf->sf_next;
602 else
603 *ppsf = psf->sf_next;
604 kfree(psf);
605 } else
606 psf_prev = psf;
607 }
608 }
609
610 static void igmpv3_send_cr(struct in_device *in_dev)
611 {
612 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
613 struct sk_buff *skb = NULL;
614 int type, dtype;
615
616 rcu_read_lock();
617 spin_lock_bh(&in_dev->mc_tomb_lock);
618
619 /* deleted MCA's */
620 pmc_prev = NULL;
621 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
622 pmc_next = pmc->next;
623 if (pmc->sfmode == MCAST_INCLUDE) {
624 type = IGMPV3_BLOCK_OLD_SOURCES;
625 dtype = IGMPV3_BLOCK_OLD_SOURCES;
626 skb = add_grec(skb, pmc, type, 1, 0);
627 skb = add_grec(skb, pmc, dtype, 1, 1);
628 }
629 if (pmc->crcount) {
630 if (pmc->sfmode == MCAST_EXCLUDE) {
631 type = IGMPV3_CHANGE_TO_INCLUDE;
632 skb = add_grec(skb, pmc, type, 1, 0);
633 }
634 pmc->crcount--;
635 if (pmc->crcount == 0) {
636 igmpv3_clear_zeros(&pmc->tomb);
637 igmpv3_clear_zeros(&pmc->sources);
638 }
639 }
640 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
641 if (pmc_prev)
642 pmc_prev->next = pmc_next;
643 else
644 in_dev->mc_tomb = pmc_next;
645 in_dev_put(pmc->interface);
646 kfree(pmc);
647 } else
648 pmc_prev = pmc;
649 }
650 spin_unlock_bh(&in_dev->mc_tomb_lock);
651
652 /* change recs */
653 for_each_pmc_rcu(in_dev, pmc) {
654 spin_lock_bh(&pmc->lock);
655 if (pmc->sfcount[MCAST_EXCLUDE]) {
656 type = IGMPV3_BLOCK_OLD_SOURCES;
657 dtype = IGMPV3_ALLOW_NEW_SOURCES;
658 } else {
659 type = IGMPV3_ALLOW_NEW_SOURCES;
660 dtype = IGMPV3_BLOCK_OLD_SOURCES;
661 }
662 skb = add_grec(skb, pmc, type, 0, 0);
663 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
664
665 /* filter mode changes */
666 if (pmc->crcount) {
667 if (pmc->sfmode == MCAST_EXCLUDE)
668 type = IGMPV3_CHANGE_TO_EXCLUDE;
669 else
670 type = IGMPV3_CHANGE_TO_INCLUDE;
671 skb = add_grec(skb, pmc, type, 0, 0);
672 pmc->crcount--;
673 }
674 spin_unlock_bh(&pmc->lock);
675 }
676 rcu_read_unlock();
677
678 if (!skb)
679 return;
680 (void) igmpv3_sendpack(skb);
681 }
682
683 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
684 int type)
685 {
686 struct sk_buff *skb;
687 struct iphdr *iph;
688 struct igmphdr *ih;
689 struct rtable *rt;
690 struct net_device *dev = in_dev->dev;
691 struct net *net = dev_net(dev);
692 __be32 group = pmc ? pmc->multiaddr : 0;
693 struct flowi4 fl4;
694 __be32 dst;
695 int hlen, tlen;
696
697 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
698 return igmpv3_send_report(in_dev, pmc);
699
700 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
701 return 0;
702
703 if (type == IGMP_HOST_LEAVE_MESSAGE)
704 dst = IGMP_ALL_ROUTER;
705 else
706 dst = group;
707
708 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
709 0, 0,
710 IPPROTO_IGMP, 0, dev->ifindex);
711 if (IS_ERR(rt))
712 return -1;
713
714 hlen = LL_RESERVED_SPACE(dev);
715 tlen = dev->needed_tailroom;
716 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
717 if (!skb) {
718 ip_rt_put(rt);
719 return -1;
720 }
721 skb->priority = TC_PRIO_CONTROL;
722
723 skb_dst_set(skb, &rt->dst);
724
725 skb_reserve(skb, hlen);
726
727 skb_reset_network_header(skb);
728 iph = ip_hdr(skb);
729 skb_put(skb, sizeof(struct iphdr) + 4);
730
731 iph->version = 4;
732 iph->ihl = (sizeof(struct iphdr)+4)>>2;
733 iph->tos = 0xc0;
734 iph->frag_off = htons(IP_DF);
735 iph->ttl = 1;
736 iph->daddr = dst;
737 iph->saddr = fl4.saddr;
738 iph->protocol = IPPROTO_IGMP;
739 ip_select_ident(net, skb, NULL);
740 ((u8 *)&iph[1])[0] = IPOPT_RA;
741 ((u8 *)&iph[1])[1] = 4;
742 ((u8 *)&iph[1])[2] = 0;
743 ((u8 *)&iph[1])[3] = 0;
744
745 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
746 ih->type = type;
747 ih->code = 0;
748 ih->csum = 0;
749 ih->group = group;
750 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
751
752 return ip_local_out(net, skb->sk, skb);
753 }
754
755 static void igmp_gq_timer_expire(unsigned long data)
756 {
757 struct in_device *in_dev = (struct in_device *)data;
758
759 in_dev->mr_gq_running = 0;
760 igmpv3_send_report(in_dev, NULL);
761 in_dev_put(in_dev);
762 }
763
764 static void igmp_ifc_timer_expire(unsigned long data)
765 {
766 struct in_device *in_dev = (struct in_device *)data;
767
768 igmpv3_send_cr(in_dev);
769 if (in_dev->mr_ifc_count) {
770 in_dev->mr_ifc_count--;
771 igmp_ifc_start_timer(in_dev,
772 unsolicited_report_interval(in_dev));
773 }
774 in_dev_put(in_dev);
775 }
776
777 static void igmp_ifc_event(struct in_device *in_dev)
778 {
779 struct net *net = dev_net(in_dev->dev);
780 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
781 return;
782 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
783 igmp_ifc_start_timer(in_dev, 1);
784 }
785
786
787 static void igmp_timer_expire(unsigned long data)
788 {
789 struct ip_mc_list *im = (struct ip_mc_list *)data;
790 struct in_device *in_dev = im->interface;
791
792 spin_lock(&im->lock);
793 im->tm_running = 0;
794
795 if (im->unsolicit_count) {
796 im->unsolicit_count--;
797 igmp_start_timer(im, unsolicited_report_interval(in_dev));
798 }
799 im->reporter = 1;
800 spin_unlock(&im->lock);
801
802 if (IGMP_V1_SEEN(in_dev))
803 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
804 else if (IGMP_V2_SEEN(in_dev))
805 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
806 else
807 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
808
809 ip_ma_put(im);
810 }
811
812 /* mark EXCLUDE-mode sources */
813 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
814 {
815 struct ip_sf_list *psf;
816 int i, scount;
817
818 scount = 0;
819 for (psf = pmc->sources; psf; psf = psf->sf_next) {
820 if (scount == nsrcs)
821 break;
822 for (i = 0; i < nsrcs; i++) {
823 /* skip inactive filters */
824 if (psf->sf_count[MCAST_INCLUDE] ||
825 pmc->sfcount[MCAST_EXCLUDE] !=
826 psf->sf_count[MCAST_EXCLUDE])
827 break;
828 if (srcs[i] == psf->sf_inaddr) {
829 scount++;
830 break;
831 }
832 }
833 }
834 pmc->gsquery = 0;
835 if (scount == nsrcs) /* all sources excluded */
836 return 0;
837 return 1;
838 }
839
840 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
841 {
842 struct ip_sf_list *psf;
843 int i, scount;
844
845 if (pmc->sfmode == MCAST_EXCLUDE)
846 return igmp_xmarksources(pmc, nsrcs, srcs);
847
848 /* mark INCLUDE-mode sources */
849 scount = 0;
850 for (psf = pmc->sources; psf; psf = psf->sf_next) {
851 if (scount == nsrcs)
852 break;
853 for (i = 0; i < nsrcs; i++)
854 if (srcs[i] == psf->sf_inaddr) {
855 psf->sf_gsresp = 1;
856 scount++;
857 break;
858 }
859 }
860 if (!scount) {
861 pmc->gsquery = 0;
862 return 0;
863 }
864 pmc->gsquery = 1;
865 return 1;
866 }
867
868 /* return true if packet was dropped */
869 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
870 {
871 struct ip_mc_list *im;
872 struct net *net = dev_net(in_dev->dev);
873
874 /* Timers are only set for non-local groups */
875
876 if (group == IGMP_ALL_HOSTS)
877 return false;
878 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
879 return false;
880
881 rcu_read_lock();
882 for_each_pmc_rcu(in_dev, im) {
883 if (im->multiaddr == group) {
884 igmp_stop_timer(im);
885 break;
886 }
887 }
888 rcu_read_unlock();
889 return false;
890 }
891
892 /* return true if packet was dropped */
893 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
894 int len)
895 {
896 struct igmphdr *ih = igmp_hdr(skb);
897 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
898 struct ip_mc_list *im;
899 __be32 group = ih->group;
900 int max_delay;
901 int mark = 0;
902 struct net *net = dev_net(in_dev->dev);
903
904
905 if (len == 8) {
906 if (ih->code == 0) {
907 /* Alas, old v1 router presents here. */
908
909 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
910 in_dev->mr_v1_seen = jiffies +
911 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
912 group = 0;
913 } else {
914 /* v2 router present */
915 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
916 in_dev->mr_v2_seen = jiffies +
917 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
918 }
919 /* cancel the interface change timer */
920 in_dev->mr_ifc_count = 0;
921 if (del_timer(&in_dev->mr_ifc_timer))
922 __in_dev_put(in_dev);
923 /* clear deleted report items */
924 igmpv3_clear_delrec(in_dev);
925 } else if (len < 12) {
926 return true; /* ignore bogus packet; freed by caller */
927 } else if (IGMP_V1_SEEN(in_dev)) {
928 /* This is a v3 query with v1 queriers present */
929 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
930 group = 0;
931 } else if (IGMP_V2_SEEN(in_dev)) {
932 /* this is a v3 query with v2 queriers present;
933 * Interpretation of the max_delay code is problematic here.
934 * A real v2 host would use ih_code directly, while v3 has a
935 * different encoding. We use the v3 encoding as more likely
936 * to be intended in a v3 query.
937 */
938 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
939 if (!max_delay)
940 max_delay = 1; /* can't mod w/ 0 */
941 } else { /* v3 */
942 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
943 return true;
944
945 ih3 = igmpv3_query_hdr(skb);
946 if (ih3->nsrcs) {
947 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
948 + ntohs(ih3->nsrcs)*sizeof(__be32)))
949 return true;
950 ih3 = igmpv3_query_hdr(skb);
951 }
952
953 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
954 if (!max_delay)
955 max_delay = 1; /* can't mod w/ 0 */
956 in_dev->mr_maxdelay = max_delay;
957 if (ih3->qrv)
958 in_dev->mr_qrv = ih3->qrv;
959 if (!group) { /* general query */
960 if (ih3->nsrcs)
961 return true; /* no sources allowed */
962 igmp_gq_start_timer(in_dev);
963 return false;
964 }
965 /* mark sources to include, if group & source-specific */
966 mark = ih3->nsrcs != 0;
967 }
968
969 /*
970 * - Start the timers in all of our membership records
971 * that the query applies to for the interface on
972 * which the query arrived excl. those that belong
973 * to a "local" group (224.0.0.X)
974 * - For timers already running check if they need to
975 * be reset.
976 * - Use the igmp->igmp_code field as the maximum
977 * delay possible
978 */
979 rcu_read_lock();
980 for_each_pmc_rcu(in_dev, im) {
981 int changed;
982
983 if (group && group != im->multiaddr)
984 continue;
985 if (im->multiaddr == IGMP_ALL_HOSTS)
986 continue;
987 if (ipv4_is_local_multicast(im->multiaddr) &&
988 !net->ipv4.sysctl_igmp_llm_reports)
989 continue;
990 spin_lock_bh(&im->lock);
991 if (im->tm_running)
992 im->gsquery = im->gsquery && mark;
993 else
994 im->gsquery = mark;
995 changed = !im->gsquery ||
996 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
997 spin_unlock_bh(&im->lock);
998 if (changed)
999 igmp_mod_timer(im, max_delay);
1000 }
1001 rcu_read_unlock();
1002 return false;
1003 }
1004
1005 /* called in rcu_read_lock() section */
1006 int igmp_rcv(struct sk_buff *skb)
1007 {
1008 /* This basically follows the spec line by line -- see RFC1112 */
1009 struct igmphdr *ih;
1010 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1011 int len = skb->len;
1012 bool dropped = true;
1013
1014 if (!in_dev)
1015 goto drop;
1016
1017 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1018 goto drop;
1019
1020 if (skb_checksum_simple_validate(skb))
1021 goto drop;
1022
1023 ih = igmp_hdr(skb);
1024 switch (ih->type) {
1025 case IGMP_HOST_MEMBERSHIP_QUERY:
1026 dropped = igmp_heard_query(in_dev, skb, len);
1027 break;
1028 case IGMP_HOST_MEMBERSHIP_REPORT:
1029 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1030 /* Is it our report looped back? */
1031 if (rt_is_output_route(skb_rtable(skb)))
1032 break;
1033 /* don't rely on MC router hearing unicast reports */
1034 if (skb->pkt_type == PACKET_MULTICAST ||
1035 skb->pkt_type == PACKET_BROADCAST)
1036 dropped = igmp_heard_report(in_dev, ih->group);
1037 break;
1038 case IGMP_PIM:
1039 #ifdef CONFIG_IP_PIMSM_V1
1040 return pim_rcv_v1(skb);
1041 #endif
1042 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1043 case IGMP_DVMRP:
1044 case IGMP_TRACE:
1045 case IGMP_HOST_LEAVE_MESSAGE:
1046 case IGMP_MTRACE:
1047 case IGMP_MTRACE_RESP:
1048 break;
1049 default:
1050 break;
1051 }
1052
1053 drop:
1054 if (dropped)
1055 kfree_skb(skb);
1056 else
1057 consume_skb(skb);
1058 return 0;
1059 }
1060
1061 #endif
1062
1063
1064 /*
1065 * Add a filter to a device
1066 */
1067
1068 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1069 {
1070 char buf[MAX_ADDR_LEN];
1071 struct net_device *dev = in_dev->dev;
1072
1073 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1074 We will get multicast token leakage, when IFF_MULTICAST
1075 is changed. This check should be done in ndo_set_rx_mode
1076 routine. Something sort of:
1077 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1078 --ANK
1079 */
1080 if (arp_mc_map(addr, buf, dev, 0) == 0)
1081 dev_mc_add(dev, buf);
1082 }
1083
1084 /*
1085 * Remove a filter from a device
1086 */
1087
1088 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1089 {
1090 char buf[MAX_ADDR_LEN];
1091 struct net_device *dev = in_dev->dev;
1092
1093 if (arp_mc_map(addr, buf, dev, 0) == 0)
1094 dev_mc_del(dev, buf);
1095 }
1096
1097 #ifdef CONFIG_IP_MULTICAST
1098 /*
1099 * deleted ip_mc_list manipulation
1100 */
1101 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1102 {
1103 struct ip_mc_list *pmc;
1104 struct net *net = dev_net(in_dev->dev);
1105
1106 /* this is an "ip_mc_list" for convenience; only the fields below
1107 * are actually used. In particular, the refcnt and users are not
1108 * used for management of the delete list. Using the same structure
1109 * for deleted items allows change reports to use common code with
1110 * non-deleted or query-response MCA's.
1111 */
1112 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1113 if (!pmc)
1114 return;
1115 spin_lock_bh(&im->lock);
1116 pmc->interface = im->interface;
1117 in_dev_hold(in_dev);
1118 pmc->multiaddr = im->multiaddr;
1119 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1120 pmc->sfmode = im->sfmode;
1121 if (pmc->sfmode == MCAST_INCLUDE) {
1122 struct ip_sf_list *psf;
1123
1124 pmc->tomb = im->tomb;
1125 pmc->sources = im->sources;
1126 im->tomb = im->sources = NULL;
1127 for (psf = pmc->sources; psf; psf = psf->sf_next)
1128 psf->sf_crcount = pmc->crcount;
1129 }
1130 spin_unlock_bh(&im->lock);
1131
1132 spin_lock_bh(&in_dev->mc_tomb_lock);
1133 pmc->next = in_dev->mc_tomb;
1134 in_dev->mc_tomb = pmc;
1135 spin_unlock_bh(&in_dev->mc_tomb_lock);
1136 }
1137
1138 /*
1139 * restore ip_mc_list deleted records
1140 */
1141 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1142 {
1143 struct ip_mc_list *pmc, *pmc_prev;
1144 struct ip_sf_list *psf;
1145 struct net *net = dev_net(in_dev->dev);
1146 __be32 multiaddr = im->multiaddr;
1147
1148 spin_lock_bh(&in_dev->mc_tomb_lock);
1149 pmc_prev = NULL;
1150 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1151 if (pmc->multiaddr == multiaddr)
1152 break;
1153 pmc_prev = pmc;
1154 }
1155 if (pmc) {
1156 if (pmc_prev)
1157 pmc_prev->next = pmc->next;
1158 else
1159 in_dev->mc_tomb = pmc->next;
1160 }
1161 spin_unlock_bh(&in_dev->mc_tomb_lock);
1162
1163 spin_lock_bh(&im->lock);
1164 if (pmc) {
1165 im->interface = pmc->interface;
1166 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1167 im->sfmode = pmc->sfmode;
1168 if (pmc->sfmode == MCAST_INCLUDE) {
1169 im->tomb = pmc->tomb;
1170 im->sources = pmc->sources;
1171 for (psf = im->sources; psf; psf = psf->sf_next)
1172 psf->sf_crcount = im->crcount;
1173 }
1174 in_dev_put(pmc->interface);
1175 }
1176 spin_unlock_bh(&im->lock);
1177 }
1178
1179 /*
1180 * flush ip_mc_list deleted records
1181 */
1182 static void igmpv3_clear_delrec(struct in_device *in_dev)
1183 {
1184 struct ip_mc_list *pmc, *nextpmc;
1185
1186 spin_lock_bh(&in_dev->mc_tomb_lock);
1187 pmc = in_dev->mc_tomb;
1188 in_dev->mc_tomb = NULL;
1189 spin_unlock_bh(&in_dev->mc_tomb_lock);
1190
1191 for (; pmc; pmc = nextpmc) {
1192 nextpmc = pmc->next;
1193 ip_mc_clear_src(pmc);
1194 in_dev_put(pmc->interface);
1195 kfree(pmc);
1196 }
1197 /* clear dead sources, too */
1198 rcu_read_lock();
1199 for_each_pmc_rcu(in_dev, pmc) {
1200 struct ip_sf_list *psf, *psf_next;
1201
1202 spin_lock_bh(&pmc->lock);
1203 psf = pmc->tomb;
1204 pmc->tomb = NULL;
1205 spin_unlock_bh(&pmc->lock);
1206 for (; psf; psf = psf_next) {
1207 psf_next = psf->sf_next;
1208 kfree(psf);
1209 }
1210 }
1211 rcu_read_unlock();
1212 }
1213 #endif
1214
1215 static void igmp_group_dropped(struct ip_mc_list *im)
1216 {
1217 struct in_device *in_dev = im->interface;
1218 #ifdef CONFIG_IP_MULTICAST
1219 struct net *net = dev_net(in_dev->dev);
1220 int reporter;
1221 #endif
1222
1223 if (im->loaded) {
1224 im->loaded = 0;
1225 ip_mc_filter_del(in_dev, im->multiaddr);
1226 }
1227
1228 #ifdef CONFIG_IP_MULTICAST
1229 if (im->multiaddr == IGMP_ALL_HOSTS)
1230 return;
1231 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1232 return;
1233
1234 reporter = im->reporter;
1235 igmp_stop_timer(im);
1236
1237 if (!in_dev->dead) {
1238 if (IGMP_V1_SEEN(in_dev))
1239 return;
1240 if (IGMP_V2_SEEN(in_dev)) {
1241 if (reporter)
1242 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1243 return;
1244 }
1245 /* IGMPv3 */
1246 igmpv3_add_delrec(in_dev, im);
1247
1248 igmp_ifc_event(in_dev);
1249 }
1250 #endif
1251 }
1252
1253 static void igmp_group_added(struct ip_mc_list *im)
1254 {
1255 struct in_device *in_dev = im->interface;
1256 #ifdef CONFIG_IP_MULTICAST
1257 struct net *net = dev_net(in_dev->dev);
1258 #endif
1259
1260 if (im->loaded == 0) {
1261 im->loaded = 1;
1262 ip_mc_filter_add(in_dev, im->multiaddr);
1263 }
1264
1265 #ifdef CONFIG_IP_MULTICAST
1266 if (im->multiaddr == IGMP_ALL_HOSTS)
1267 return;
1268 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1269 return;
1270
1271 if (in_dev->dead)
1272 return;
1273 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1274 spin_lock_bh(&im->lock);
1275 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1276 spin_unlock_bh(&im->lock);
1277 return;
1278 }
1279 /* else, v3 */
1280
1281 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1282 igmp_ifc_event(in_dev);
1283 #endif
1284 }
1285
1286
1287 /*
1288 * Multicast list managers
1289 */
1290
1291 static u32 ip_mc_hash(const struct ip_mc_list *im)
1292 {
1293 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1294 }
1295
1296 static void ip_mc_hash_add(struct in_device *in_dev,
1297 struct ip_mc_list *im)
1298 {
1299 struct ip_mc_list __rcu **mc_hash;
1300 u32 hash;
1301
1302 mc_hash = rtnl_dereference(in_dev->mc_hash);
1303 if (mc_hash) {
1304 hash = ip_mc_hash(im);
1305 im->next_hash = mc_hash[hash];
1306 rcu_assign_pointer(mc_hash[hash], im);
1307 return;
1308 }
1309
1310 /* do not use a hash table for small number of items */
1311 if (in_dev->mc_count < 4)
1312 return;
1313
1314 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1315 GFP_KERNEL);
1316 if (!mc_hash)
1317 return;
1318
1319 for_each_pmc_rtnl(in_dev, im) {
1320 hash = ip_mc_hash(im);
1321 im->next_hash = mc_hash[hash];
1322 RCU_INIT_POINTER(mc_hash[hash], im);
1323 }
1324
1325 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1326 }
1327
1328 static void ip_mc_hash_remove(struct in_device *in_dev,
1329 struct ip_mc_list *im)
1330 {
1331 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1332 struct ip_mc_list *aux;
1333
1334 if (!mc_hash)
1335 return;
1336 mc_hash += ip_mc_hash(im);
1337 while ((aux = rtnl_dereference(*mc_hash)) != im)
1338 mc_hash = &aux->next_hash;
1339 *mc_hash = im->next_hash;
1340 }
1341
1342
1343 /*
1344 * A socket has joined a multicast group on device dev.
1345 */
1346
1347 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1348 {
1349 struct ip_mc_list *im;
1350 #ifdef CONFIG_IP_MULTICAST
1351 struct net *net = dev_net(in_dev->dev);
1352 #endif
1353
1354 ASSERT_RTNL();
1355
1356 for_each_pmc_rtnl(in_dev, im) {
1357 if (im->multiaddr == addr) {
1358 im->users++;
1359 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1360 goto out;
1361 }
1362 }
1363
1364 im = kzalloc(sizeof(*im), GFP_KERNEL);
1365 if (!im)
1366 goto out;
1367
1368 im->users = 1;
1369 im->interface = in_dev;
1370 in_dev_hold(in_dev);
1371 im->multiaddr = addr;
1372 /* initial mode is (EX, empty) */
1373 im->sfmode = MCAST_EXCLUDE;
1374 im->sfcount[MCAST_EXCLUDE] = 1;
1375 atomic_set(&im->refcnt, 1);
1376 spin_lock_init(&im->lock);
1377 #ifdef CONFIG_IP_MULTICAST
1378 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1379 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1380 #endif
1381
1382 im->next_rcu = in_dev->mc_list;
1383 in_dev->mc_count++;
1384 rcu_assign_pointer(in_dev->mc_list, im);
1385
1386 ip_mc_hash_add(in_dev, im);
1387
1388 #ifdef CONFIG_IP_MULTICAST
1389 igmpv3_del_delrec(in_dev, im);
1390 #endif
1391 igmp_group_added(im);
1392 if (!in_dev->dead)
1393 ip_rt_multicast_event(in_dev);
1394 out:
1395 return;
1396 }
1397 EXPORT_SYMBOL(ip_mc_inc_group);
1398
1399 static int ip_mc_check_iphdr(struct sk_buff *skb)
1400 {
1401 const struct iphdr *iph;
1402 unsigned int len;
1403 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1404
1405 if (!pskb_may_pull(skb, offset))
1406 return -EINVAL;
1407
1408 iph = ip_hdr(skb);
1409
1410 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1411 return -EINVAL;
1412
1413 offset += ip_hdrlen(skb) - sizeof(*iph);
1414
1415 if (!pskb_may_pull(skb, offset))
1416 return -EINVAL;
1417
1418 iph = ip_hdr(skb);
1419
1420 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1421 return -EINVAL;
1422
1423 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1424 if (skb->len < len || len < offset)
1425 return -EINVAL;
1426
1427 skb_set_transport_header(skb, offset);
1428
1429 return 0;
1430 }
1431
1432 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1433 {
1434 unsigned int len = skb_transport_offset(skb);
1435
1436 len += sizeof(struct igmpv3_report);
1437
1438 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1439 }
1440
1441 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1442 {
1443 unsigned int len = skb_transport_offset(skb);
1444
1445 len += sizeof(struct igmphdr);
1446 if (skb->len < len)
1447 return -EINVAL;
1448
1449 /* IGMPv{1,2}? */
1450 if (skb->len != len) {
1451 /* or IGMPv3? */
1452 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1453 if (skb->len < len || !pskb_may_pull(skb, len))
1454 return -EINVAL;
1455 }
1456
1457 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1458 * all-systems destination addresses (224.0.0.1) for general queries
1459 */
1460 if (!igmp_hdr(skb)->group &&
1461 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1462 return -EINVAL;
1463
1464 return 0;
1465 }
1466
1467 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1468 {
1469 switch (igmp_hdr(skb)->type) {
1470 case IGMP_HOST_LEAVE_MESSAGE:
1471 case IGMP_HOST_MEMBERSHIP_REPORT:
1472 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1473 /* fall through */
1474 return 0;
1475 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1476 return ip_mc_check_igmp_reportv3(skb);
1477 case IGMP_HOST_MEMBERSHIP_QUERY:
1478 return ip_mc_check_igmp_query(skb);
1479 default:
1480 return -ENOMSG;
1481 }
1482 }
1483
1484 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1485 {
1486 return skb_checksum_simple_validate(skb);
1487 }
1488
1489 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1490
1491 {
1492 struct sk_buff *skb_chk;
1493 unsigned int transport_len;
1494 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1495 int ret = -EINVAL;
1496
1497 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1498
1499 skb_chk = skb_checksum_trimmed(skb, transport_len,
1500 ip_mc_validate_checksum);
1501 if (!skb_chk)
1502 goto err;
1503
1504 if (!pskb_may_pull(skb_chk, len))
1505 goto err;
1506
1507 ret = ip_mc_check_igmp_msg(skb_chk);
1508 if (ret)
1509 goto err;
1510
1511 if (skb_trimmed)
1512 *skb_trimmed = skb_chk;
1513 /* free now unneeded clone */
1514 else if (skb_chk != skb)
1515 kfree_skb(skb_chk);
1516
1517 ret = 0;
1518
1519 err:
1520 if (ret && skb_chk && skb_chk != skb)
1521 kfree_skb(skb_chk);
1522
1523 return ret;
1524 }
1525
1526 /**
1527 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1528 * @skb: the skb to validate
1529 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1530 *
1531 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1532 * skb transport header accordingly and returns zero.
1533 *
1534 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1535 * standard
1536 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1537 * -ENOMEM: A memory allocation failure happened.
1538 *
1539 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1540 * to NULL): After parsing an IGMP packet successfully it will point to
1541 * an skb which has its tail aligned to the IP packet end. This might
1542 * either be the originally provided skb or a trimmed, cloned version if
1543 * the skb frame had data beyond the IP packet. A cloned skb allows us
1544 * to leave the original skb and its full frame unchanged (which might be
1545 * desirable for layer 2 frame jugglers).
1546 *
1547 * Caller needs to set the skb network header and free any returned skb if it
1548 * differs from the provided skb.
1549 */
1550 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1551 {
1552 int ret = ip_mc_check_iphdr(skb);
1553
1554 if (ret < 0)
1555 return ret;
1556
1557 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1558 return -ENOMSG;
1559
1560 return __ip_mc_check_igmp(skb, skb_trimmed);
1561 }
1562 EXPORT_SYMBOL(ip_mc_check_igmp);
1563
1564 /*
1565 * Resend IGMP JOIN report; used by netdev notifier.
1566 */
1567 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1568 {
1569 #ifdef CONFIG_IP_MULTICAST
1570 struct ip_mc_list *im;
1571 int type;
1572 struct net *net = dev_net(in_dev->dev);
1573
1574 ASSERT_RTNL();
1575
1576 for_each_pmc_rtnl(in_dev, im) {
1577 if (im->multiaddr == IGMP_ALL_HOSTS)
1578 continue;
1579 if (ipv4_is_local_multicast(im->multiaddr) &&
1580 !net->ipv4.sysctl_igmp_llm_reports)
1581 continue;
1582
1583 /* a failover is happening and switches
1584 * must be notified immediately
1585 */
1586 if (IGMP_V1_SEEN(in_dev))
1587 type = IGMP_HOST_MEMBERSHIP_REPORT;
1588 else if (IGMP_V2_SEEN(in_dev))
1589 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1590 else
1591 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1592 igmp_send_report(in_dev, im, type);
1593 }
1594 #endif
1595 }
1596
1597 /*
1598 * A socket has left a multicast group on device dev
1599 */
1600
1601 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1602 {
1603 struct ip_mc_list *i;
1604 struct ip_mc_list __rcu **ip;
1605
1606 ASSERT_RTNL();
1607
1608 for (ip = &in_dev->mc_list;
1609 (i = rtnl_dereference(*ip)) != NULL;
1610 ip = &i->next_rcu) {
1611 if (i->multiaddr == addr) {
1612 if (--i->users == 0) {
1613 ip_mc_hash_remove(in_dev, i);
1614 *ip = i->next_rcu;
1615 in_dev->mc_count--;
1616 igmp_group_dropped(i);
1617 ip_mc_clear_src(i);
1618
1619 if (!in_dev->dead)
1620 ip_rt_multicast_event(in_dev);
1621
1622 ip_ma_put(i);
1623 return;
1624 }
1625 break;
1626 }
1627 }
1628 }
1629 EXPORT_SYMBOL(ip_mc_dec_group);
1630
1631 /* Device changing type */
1632
1633 void ip_mc_unmap(struct in_device *in_dev)
1634 {
1635 struct ip_mc_list *pmc;
1636
1637 ASSERT_RTNL();
1638
1639 for_each_pmc_rtnl(in_dev, pmc)
1640 igmp_group_dropped(pmc);
1641 }
1642
1643 void ip_mc_remap(struct in_device *in_dev)
1644 {
1645 struct ip_mc_list *pmc;
1646
1647 ASSERT_RTNL();
1648
1649 for_each_pmc_rtnl(in_dev, pmc) {
1650 #ifdef CONFIG_IP_MULTICAST
1651 igmpv3_del_delrec(in_dev, pmc);
1652 #endif
1653 igmp_group_added(pmc);
1654 }
1655 }
1656
1657 /* Device going down */
1658
1659 void ip_mc_down(struct in_device *in_dev)
1660 {
1661 struct ip_mc_list *pmc;
1662
1663 ASSERT_RTNL();
1664
1665 for_each_pmc_rtnl(in_dev, pmc)
1666 igmp_group_dropped(pmc);
1667
1668 #ifdef CONFIG_IP_MULTICAST
1669 in_dev->mr_ifc_count = 0;
1670 if (del_timer(&in_dev->mr_ifc_timer))
1671 __in_dev_put(in_dev);
1672 in_dev->mr_gq_running = 0;
1673 if (del_timer(&in_dev->mr_gq_timer))
1674 __in_dev_put(in_dev);
1675 #endif
1676
1677 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1678 }
1679
1680 void ip_mc_init_dev(struct in_device *in_dev)
1681 {
1682 #ifdef CONFIG_IP_MULTICAST
1683 struct net *net = dev_net(in_dev->dev);
1684 #endif
1685 ASSERT_RTNL();
1686
1687 #ifdef CONFIG_IP_MULTICAST
1688 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1689 (unsigned long)in_dev);
1690 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1691 (unsigned long)in_dev);
1692 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1693 #endif
1694
1695 spin_lock_init(&in_dev->mc_tomb_lock);
1696 }
1697
1698 /* Device going up */
1699
1700 void ip_mc_up(struct in_device *in_dev)
1701 {
1702 struct ip_mc_list *pmc;
1703 #ifdef CONFIG_IP_MULTICAST
1704 struct net *net = dev_net(in_dev->dev);
1705 #endif
1706
1707 ASSERT_RTNL();
1708
1709 #ifdef CONFIG_IP_MULTICAST
1710 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1711 #endif
1712 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
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 /*
1723 * Device is about to be destroyed: clean up.
1724 */
1725
1726 void ip_mc_destroy_dev(struct in_device *in_dev)
1727 {
1728 struct ip_mc_list *i;
1729
1730 ASSERT_RTNL();
1731
1732 /* Deactivate timers */
1733 ip_mc_down(in_dev);
1734 #ifdef CONFIG_IP_MULTICAST
1735 igmpv3_clear_delrec(in_dev);
1736 #endif
1737
1738 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1739 in_dev->mc_list = i->next_rcu;
1740 in_dev->mc_count--;
1741 ip_ma_put(i);
1742 }
1743 }
1744
1745 /* RTNL is locked */
1746 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1747 {
1748 struct net_device *dev = NULL;
1749 struct in_device *idev = NULL;
1750
1751 if (imr->imr_ifindex) {
1752 idev = inetdev_by_index(net, imr->imr_ifindex);
1753 return idev;
1754 }
1755 if (imr->imr_address.s_addr) {
1756 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1757 if (!dev)
1758 return NULL;
1759 }
1760
1761 if (!dev) {
1762 struct rtable *rt = ip_route_output(net,
1763 imr->imr_multiaddr.s_addr,
1764 0, 0, 0);
1765 if (!IS_ERR(rt)) {
1766 dev = rt->dst.dev;
1767 ip_rt_put(rt);
1768 }
1769 }
1770 if (dev) {
1771 imr->imr_ifindex = dev->ifindex;
1772 idev = __in_dev_get_rtnl(dev);
1773 }
1774 return idev;
1775 }
1776
1777 /*
1778 * Join a socket to a group
1779 */
1780
1781 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1782 __be32 *psfsrc)
1783 {
1784 struct ip_sf_list *psf, *psf_prev;
1785 int rv = 0;
1786
1787 psf_prev = NULL;
1788 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1789 if (psf->sf_inaddr == *psfsrc)
1790 break;
1791 psf_prev = psf;
1792 }
1793 if (!psf || psf->sf_count[sfmode] == 0) {
1794 /* source filter not found, or count wrong => bug */
1795 return -ESRCH;
1796 }
1797 psf->sf_count[sfmode]--;
1798 if (psf->sf_count[sfmode] == 0) {
1799 ip_rt_multicast_event(pmc->interface);
1800 }
1801 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1802 #ifdef CONFIG_IP_MULTICAST
1803 struct in_device *in_dev = pmc->interface;
1804 struct net *net = dev_net(in_dev->dev);
1805 #endif
1806
1807 /* no more filters for this source */
1808 if (psf_prev)
1809 psf_prev->sf_next = psf->sf_next;
1810 else
1811 pmc->sources = psf->sf_next;
1812 #ifdef CONFIG_IP_MULTICAST
1813 if (psf->sf_oldin &&
1814 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1815 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1816 psf->sf_next = pmc->tomb;
1817 pmc->tomb = psf;
1818 rv = 1;
1819 } else
1820 #endif
1821 kfree(psf);
1822 }
1823 return rv;
1824 }
1825
1826 #ifndef CONFIG_IP_MULTICAST
1827 #define igmp_ifc_event(x) do { } while (0)
1828 #endif
1829
1830 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1831 int sfcount, __be32 *psfsrc, int delta)
1832 {
1833 struct ip_mc_list *pmc;
1834 int changerec = 0;
1835 int i, err;
1836
1837 if (!in_dev)
1838 return -ENODEV;
1839 rcu_read_lock();
1840 for_each_pmc_rcu(in_dev, pmc) {
1841 if (*pmca == pmc->multiaddr)
1842 break;
1843 }
1844 if (!pmc) {
1845 /* MCA not found?? bug */
1846 rcu_read_unlock();
1847 return -ESRCH;
1848 }
1849 spin_lock_bh(&pmc->lock);
1850 rcu_read_unlock();
1851 #ifdef CONFIG_IP_MULTICAST
1852 sf_markstate(pmc);
1853 #endif
1854 if (!delta) {
1855 err = -EINVAL;
1856 if (!pmc->sfcount[sfmode])
1857 goto out_unlock;
1858 pmc->sfcount[sfmode]--;
1859 }
1860 err = 0;
1861 for (i = 0; i < sfcount; i++) {
1862 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1863
1864 changerec |= rv > 0;
1865 if (!err && rv < 0)
1866 err = rv;
1867 }
1868 if (pmc->sfmode == MCAST_EXCLUDE &&
1869 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1870 pmc->sfcount[MCAST_INCLUDE]) {
1871 #ifdef CONFIG_IP_MULTICAST
1872 struct ip_sf_list *psf;
1873 struct net *net = dev_net(in_dev->dev);
1874 #endif
1875
1876 /* filter mode change */
1877 pmc->sfmode = MCAST_INCLUDE;
1878 #ifdef CONFIG_IP_MULTICAST
1879 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1880 in_dev->mr_ifc_count = pmc->crcount;
1881 for (psf = pmc->sources; psf; psf = psf->sf_next)
1882 psf->sf_crcount = 0;
1883 igmp_ifc_event(pmc->interface);
1884 } else if (sf_setstate(pmc) || changerec) {
1885 igmp_ifc_event(pmc->interface);
1886 #endif
1887 }
1888 out_unlock:
1889 spin_unlock_bh(&pmc->lock);
1890 return err;
1891 }
1892
1893 /*
1894 * Add multicast single-source filter to the interface list
1895 */
1896 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1897 __be32 *psfsrc)
1898 {
1899 struct ip_sf_list *psf, *psf_prev;
1900
1901 psf_prev = NULL;
1902 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1903 if (psf->sf_inaddr == *psfsrc)
1904 break;
1905 psf_prev = psf;
1906 }
1907 if (!psf) {
1908 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1909 if (!psf)
1910 return -ENOBUFS;
1911 psf->sf_inaddr = *psfsrc;
1912 if (psf_prev) {
1913 psf_prev->sf_next = psf;
1914 } else
1915 pmc->sources = psf;
1916 }
1917 psf->sf_count[sfmode]++;
1918 if (psf->sf_count[sfmode] == 1) {
1919 ip_rt_multicast_event(pmc->interface);
1920 }
1921 return 0;
1922 }
1923
1924 #ifdef CONFIG_IP_MULTICAST
1925 static void sf_markstate(struct ip_mc_list *pmc)
1926 {
1927 struct ip_sf_list *psf;
1928 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1929
1930 for (psf = pmc->sources; psf; psf = psf->sf_next)
1931 if (pmc->sfcount[MCAST_EXCLUDE]) {
1932 psf->sf_oldin = mca_xcount ==
1933 psf->sf_count[MCAST_EXCLUDE] &&
1934 !psf->sf_count[MCAST_INCLUDE];
1935 } else
1936 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1937 }
1938
1939 static int sf_setstate(struct ip_mc_list *pmc)
1940 {
1941 struct ip_sf_list *psf, *dpsf;
1942 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1943 int qrv = pmc->interface->mr_qrv;
1944 int new_in, rv;
1945
1946 rv = 0;
1947 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1948 if (pmc->sfcount[MCAST_EXCLUDE]) {
1949 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1950 !psf->sf_count[MCAST_INCLUDE];
1951 } else
1952 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1953 if (new_in) {
1954 if (!psf->sf_oldin) {
1955 struct ip_sf_list *prev = NULL;
1956
1957 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1958 if (dpsf->sf_inaddr == psf->sf_inaddr)
1959 break;
1960 prev = dpsf;
1961 }
1962 if (dpsf) {
1963 if (prev)
1964 prev->sf_next = dpsf->sf_next;
1965 else
1966 pmc->tomb = dpsf->sf_next;
1967 kfree(dpsf);
1968 }
1969 psf->sf_crcount = qrv;
1970 rv++;
1971 }
1972 } else if (psf->sf_oldin) {
1973
1974 psf->sf_crcount = 0;
1975 /*
1976 * add or update "delete" records if an active filter
1977 * is now inactive
1978 */
1979 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1980 if (dpsf->sf_inaddr == psf->sf_inaddr)
1981 break;
1982 if (!dpsf) {
1983 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1984 if (!dpsf)
1985 continue;
1986 *dpsf = *psf;
1987 /* pmc->lock held by callers */
1988 dpsf->sf_next = pmc->tomb;
1989 pmc->tomb = dpsf;
1990 }
1991 dpsf->sf_crcount = qrv;
1992 rv++;
1993 }
1994 }
1995 return rv;
1996 }
1997 #endif
1998
1999 /*
2000 * Add multicast source filter list to the interface list
2001 */
2002 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2003 int sfcount, __be32 *psfsrc, int delta)
2004 {
2005 struct ip_mc_list *pmc;
2006 int isexclude;
2007 int i, err;
2008
2009 if (!in_dev)
2010 return -ENODEV;
2011 rcu_read_lock();
2012 for_each_pmc_rcu(in_dev, pmc) {
2013 if (*pmca == pmc->multiaddr)
2014 break;
2015 }
2016 if (!pmc) {
2017 /* MCA not found?? bug */
2018 rcu_read_unlock();
2019 return -ESRCH;
2020 }
2021 spin_lock_bh(&pmc->lock);
2022 rcu_read_unlock();
2023
2024 #ifdef CONFIG_IP_MULTICAST
2025 sf_markstate(pmc);
2026 #endif
2027 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2028 if (!delta)
2029 pmc->sfcount[sfmode]++;
2030 err = 0;
2031 for (i = 0; i < sfcount; i++) {
2032 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2033 if (err)
2034 break;
2035 }
2036 if (err) {
2037 int j;
2038
2039 if (!delta)
2040 pmc->sfcount[sfmode]--;
2041 for (j = 0; j < i; j++)
2042 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2043 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2044 #ifdef CONFIG_IP_MULTICAST
2045 struct ip_sf_list *psf;
2046 struct net *net = dev_net(pmc->interface->dev);
2047 in_dev = pmc->interface;
2048 #endif
2049
2050 /* filter mode change */
2051 if (pmc->sfcount[MCAST_EXCLUDE])
2052 pmc->sfmode = MCAST_EXCLUDE;
2053 else if (pmc->sfcount[MCAST_INCLUDE])
2054 pmc->sfmode = MCAST_INCLUDE;
2055 #ifdef CONFIG_IP_MULTICAST
2056 /* else no filters; keep old mode for reports */
2057
2058 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2059 in_dev->mr_ifc_count = pmc->crcount;
2060 for (psf = pmc->sources; psf; psf = psf->sf_next)
2061 psf->sf_crcount = 0;
2062 igmp_ifc_event(in_dev);
2063 } else if (sf_setstate(pmc)) {
2064 igmp_ifc_event(in_dev);
2065 #endif
2066 }
2067 spin_unlock_bh(&pmc->lock);
2068 return err;
2069 }
2070
2071 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2072 {
2073 struct ip_sf_list *psf, *nextpsf;
2074
2075 for (psf = pmc->tomb; psf; psf = nextpsf) {
2076 nextpsf = psf->sf_next;
2077 kfree(psf);
2078 }
2079 pmc->tomb = NULL;
2080 for (psf = pmc->sources; psf; psf = nextpsf) {
2081 nextpsf = psf->sf_next;
2082 kfree(psf);
2083 }
2084 pmc->sources = NULL;
2085 pmc->sfmode = MCAST_EXCLUDE;
2086 pmc->sfcount[MCAST_INCLUDE] = 0;
2087 pmc->sfcount[MCAST_EXCLUDE] = 1;
2088 }
2089
2090 /* Join a multicast group
2091 */
2092
2093 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2094 {
2095 __be32 addr = imr->imr_multiaddr.s_addr;
2096 struct ip_mc_socklist *iml, *i;
2097 struct in_device *in_dev;
2098 struct inet_sock *inet = inet_sk(sk);
2099 struct net *net = sock_net(sk);
2100 int ifindex;
2101 int count = 0;
2102 int err;
2103
2104 ASSERT_RTNL();
2105
2106 if (!ipv4_is_multicast(addr))
2107 return -EINVAL;
2108
2109 in_dev = ip_mc_find_dev(net, imr);
2110
2111 if (!in_dev) {
2112 err = -ENODEV;
2113 goto done;
2114 }
2115
2116 err = -EADDRINUSE;
2117 ifindex = imr->imr_ifindex;
2118 for_each_pmc_rtnl(inet, i) {
2119 if (i->multi.imr_multiaddr.s_addr == addr &&
2120 i->multi.imr_ifindex == ifindex)
2121 goto done;
2122 count++;
2123 }
2124 err = -ENOBUFS;
2125 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2126 goto done;
2127 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2128 if (!iml)
2129 goto done;
2130
2131 memcpy(&iml->multi, imr, sizeof(*imr));
2132 iml->next_rcu = inet->mc_list;
2133 iml->sflist = NULL;
2134 iml->sfmode = MCAST_EXCLUDE;
2135 rcu_assign_pointer(inet->mc_list, iml);
2136 ip_mc_inc_group(in_dev, addr);
2137 err = 0;
2138 done:
2139 return err;
2140 }
2141 EXPORT_SYMBOL(ip_mc_join_group);
2142
2143 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2144 struct in_device *in_dev)
2145 {
2146 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2147 int err;
2148
2149 if (!psf) {
2150 /* any-source empty exclude case */
2151 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2152 iml->sfmode, 0, NULL, 0);
2153 }
2154 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2155 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2156 RCU_INIT_POINTER(iml->sflist, NULL);
2157 /* decrease mem now to avoid the memleak warning */
2158 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2159 kfree_rcu(psf, rcu);
2160 return err;
2161 }
2162
2163 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2164 {
2165 struct inet_sock *inet = inet_sk(sk);
2166 struct ip_mc_socklist *iml;
2167 struct ip_mc_socklist __rcu **imlp;
2168 struct in_device *in_dev;
2169 struct net *net = sock_net(sk);
2170 __be32 group = imr->imr_multiaddr.s_addr;
2171 u32 ifindex;
2172 int ret = -EADDRNOTAVAIL;
2173
2174 ASSERT_RTNL();
2175
2176 in_dev = ip_mc_find_dev(net, imr);
2177 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2178 ret = -ENODEV;
2179 goto out;
2180 }
2181 ifindex = imr->imr_ifindex;
2182 for (imlp = &inet->mc_list;
2183 (iml = rtnl_dereference(*imlp)) != NULL;
2184 imlp = &iml->next_rcu) {
2185 if (iml->multi.imr_multiaddr.s_addr != group)
2186 continue;
2187 if (ifindex) {
2188 if (iml->multi.imr_ifindex != ifindex)
2189 continue;
2190 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2191 iml->multi.imr_address.s_addr)
2192 continue;
2193
2194 (void) ip_mc_leave_src(sk, iml, in_dev);
2195
2196 *imlp = iml->next_rcu;
2197
2198 if (in_dev)
2199 ip_mc_dec_group(in_dev, group);
2200
2201 /* decrease mem now to avoid the memleak warning */
2202 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2203 kfree_rcu(iml, rcu);
2204 return 0;
2205 }
2206 out:
2207 return ret;
2208 }
2209 EXPORT_SYMBOL(ip_mc_leave_group);
2210
2211 int ip_mc_source(int add, int omode, struct sock *sk, struct
2212 ip_mreq_source *mreqs, int ifindex)
2213 {
2214 int err;
2215 struct ip_mreqn imr;
2216 __be32 addr = mreqs->imr_multiaddr;
2217 struct ip_mc_socklist *pmc;
2218 struct in_device *in_dev = NULL;
2219 struct inet_sock *inet = inet_sk(sk);
2220 struct ip_sf_socklist *psl;
2221 struct net *net = sock_net(sk);
2222 int leavegroup = 0;
2223 int i, j, rv;
2224
2225 if (!ipv4_is_multicast(addr))
2226 return -EINVAL;
2227
2228 ASSERT_RTNL();
2229
2230 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2231 imr.imr_address.s_addr = mreqs->imr_interface;
2232 imr.imr_ifindex = ifindex;
2233 in_dev = ip_mc_find_dev(net, &imr);
2234
2235 if (!in_dev) {
2236 err = -ENODEV;
2237 goto done;
2238 }
2239 err = -EADDRNOTAVAIL;
2240
2241 for_each_pmc_rtnl(inet, pmc) {
2242 if ((pmc->multi.imr_multiaddr.s_addr ==
2243 imr.imr_multiaddr.s_addr) &&
2244 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2245 break;
2246 }
2247 if (!pmc) { /* must have a prior join */
2248 err = -EINVAL;
2249 goto done;
2250 }
2251 /* if a source filter was set, must be the same mode as before */
2252 if (pmc->sflist) {
2253 if (pmc->sfmode != omode) {
2254 err = -EINVAL;
2255 goto done;
2256 }
2257 } else if (pmc->sfmode != omode) {
2258 /* allow mode switches for empty-set filters */
2259 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2260 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2261 NULL, 0);
2262 pmc->sfmode = omode;
2263 }
2264
2265 psl = rtnl_dereference(pmc->sflist);
2266 if (!add) {
2267 if (!psl)
2268 goto done; /* err = -EADDRNOTAVAIL */
2269 rv = !0;
2270 for (i = 0; i < psl->sl_count; i++) {
2271 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2272 sizeof(__be32));
2273 if (rv == 0)
2274 break;
2275 }
2276 if (rv) /* source not found */
2277 goto done; /* err = -EADDRNOTAVAIL */
2278
2279 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2280 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2281 leavegroup = 1;
2282 goto done;
2283 }
2284
2285 /* update the interface filter */
2286 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2287 &mreqs->imr_sourceaddr, 1);
2288
2289 for (j = i+1; j < psl->sl_count; j++)
2290 psl->sl_addr[j-1] = psl->sl_addr[j];
2291 psl->sl_count--;
2292 err = 0;
2293 goto done;
2294 }
2295 /* else, add a new source to the filter */
2296
2297 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2298 err = -ENOBUFS;
2299 goto done;
2300 }
2301 if (!psl || psl->sl_count == psl->sl_max) {
2302 struct ip_sf_socklist *newpsl;
2303 int count = IP_SFBLOCK;
2304
2305 if (psl)
2306 count += psl->sl_max;
2307 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2308 if (!newpsl) {
2309 err = -ENOBUFS;
2310 goto done;
2311 }
2312 newpsl->sl_max = count;
2313 newpsl->sl_count = count - IP_SFBLOCK;
2314 if (psl) {
2315 for (i = 0; i < psl->sl_count; i++)
2316 newpsl->sl_addr[i] = psl->sl_addr[i];
2317 /* decrease mem now to avoid the memleak warning */
2318 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2319 kfree_rcu(psl, rcu);
2320 }
2321 rcu_assign_pointer(pmc->sflist, newpsl);
2322 psl = newpsl;
2323 }
2324 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2325 for (i = 0; i < psl->sl_count; i++) {
2326 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2327 sizeof(__be32));
2328 if (rv == 0)
2329 break;
2330 }
2331 if (rv == 0) /* address already there is an error */
2332 goto done;
2333 for (j = psl->sl_count-1; j >= i; j--)
2334 psl->sl_addr[j+1] = psl->sl_addr[j];
2335 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2336 psl->sl_count++;
2337 err = 0;
2338 /* update the interface list */
2339 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2340 &mreqs->imr_sourceaddr, 1);
2341 done:
2342 if (leavegroup)
2343 err = ip_mc_leave_group(sk, &imr);
2344 return err;
2345 }
2346
2347 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2348 {
2349 int err = 0;
2350 struct ip_mreqn imr;
2351 __be32 addr = msf->imsf_multiaddr;
2352 struct ip_mc_socklist *pmc;
2353 struct in_device *in_dev;
2354 struct inet_sock *inet = inet_sk(sk);
2355 struct ip_sf_socklist *newpsl, *psl;
2356 struct net *net = sock_net(sk);
2357 int leavegroup = 0;
2358
2359 if (!ipv4_is_multicast(addr))
2360 return -EINVAL;
2361 if (msf->imsf_fmode != MCAST_INCLUDE &&
2362 msf->imsf_fmode != MCAST_EXCLUDE)
2363 return -EINVAL;
2364
2365 ASSERT_RTNL();
2366
2367 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2368 imr.imr_address.s_addr = msf->imsf_interface;
2369 imr.imr_ifindex = ifindex;
2370 in_dev = ip_mc_find_dev(net, &imr);
2371
2372 if (!in_dev) {
2373 err = -ENODEV;
2374 goto done;
2375 }
2376
2377 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2378 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2379 leavegroup = 1;
2380 goto done;
2381 }
2382
2383 for_each_pmc_rtnl(inet, pmc) {
2384 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2385 pmc->multi.imr_ifindex == imr.imr_ifindex)
2386 break;
2387 }
2388 if (!pmc) { /* must have a prior join */
2389 err = -EINVAL;
2390 goto done;
2391 }
2392 if (msf->imsf_numsrc) {
2393 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2394 GFP_KERNEL);
2395 if (!newpsl) {
2396 err = -ENOBUFS;
2397 goto done;
2398 }
2399 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2400 memcpy(newpsl->sl_addr, msf->imsf_slist,
2401 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2402 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2403 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2404 if (err) {
2405 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2406 goto done;
2407 }
2408 } else {
2409 newpsl = NULL;
2410 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2411 msf->imsf_fmode, 0, NULL, 0);
2412 }
2413 psl = rtnl_dereference(pmc->sflist);
2414 if (psl) {
2415 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2416 psl->sl_count, psl->sl_addr, 0);
2417 /* decrease mem now to avoid the memleak warning */
2418 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2419 kfree_rcu(psl, rcu);
2420 } else
2421 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2422 0, NULL, 0);
2423 rcu_assign_pointer(pmc->sflist, newpsl);
2424 pmc->sfmode = msf->imsf_fmode;
2425 err = 0;
2426 done:
2427 if (leavegroup)
2428 err = ip_mc_leave_group(sk, &imr);
2429 return err;
2430 }
2431
2432 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2433 struct ip_msfilter __user *optval, int __user *optlen)
2434 {
2435 int err, len, count, copycount;
2436 struct ip_mreqn imr;
2437 __be32 addr = msf->imsf_multiaddr;
2438 struct ip_mc_socklist *pmc;
2439 struct in_device *in_dev;
2440 struct inet_sock *inet = inet_sk(sk);
2441 struct ip_sf_socklist *psl;
2442 struct net *net = sock_net(sk);
2443
2444 ASSERT_RTNL();
2445
2446 if (!ipv4_is_multicast(addr))
2447 return -EINVAL;
2448
2449 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2450 imr.imr_address.s_addr = msf->imsf_interface;
2451 imr.imr_ifindex = 0;
2452 in_dev = ip_mc_find_dev(net, &imr);
2453
2454 if (!in_dev) {
2455 err = -ENODEV;
2456 goto done;
2457 }
2458 err = -EADDRNOTAVAIL;
2459
2460 for_each_pmc_rtnl(inet, pmc) {
2461 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2462 pmc->multi.imr_ifindex == imr.imr_ifindex)
2463 break;
2464 }
2465 if (!pmc) /* must have a prior join */
2466 goto done;
2467 msf->imsf_fmode = pmc->sfmode;
2468 psl = rtnl_dereference(pmc->sflist);
2469 if (!psl) {
2470 len = 0;
2471 count = 0;
2472 } else {
2473 count = psl->sl_count;
2474 }
2475 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2476 len = copycount * sizeof(psl->sl_addr[0]);
2477 msf->imsf_numsrc = count;
2478 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2479 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2480 return -EFAULT;
2481 }
2482 if (len &&
2483 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2484 return -EFAULT;
2485 return 0;
2486 done:
2487 return err;
2488 }
2489
2490 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2491 struct group_filter __user *optval, int __user *optlen)
2492 {
2493 int err, i, count, copycount;
2494 struct sockaddr_in *psin;
2495 __be32 addr;
2496 struct ip_mc_socklist *pmc;
2497 struct inet_sock *inet = inet_sk(sk);
2498 struct ip_sf_socklist *psl;
2499
2500 ASSERT_RTNL();
2501
2502 psin = (struct sockaddr_in *)&gsf->gf_group;
2503 if (psin->sin_family != AF_INET)
2504 return -EINVAL;
2505 addr = psin->sin_addr.s_addr;
2506 if (!ipv4_is_multicast(addr))
2507 return -EINVAL;
2508
2509 err = -EADDRNOTAVAIL;
2510
2511 for_each_pmc_rtnl(inet, pmc) {
2512 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2513 pmc->multi.imr_ifindex == gsf->gf_interface)
2514 break;
2515 }
2516 if (!pmc) /* must have a prior join */
2517 goto done;
2518 gsf->gf_fmode = pmc->sfmode;
2519 psl = rtnl_dereference(pmc->sflist);
2520 count = psl ? psl->sl_count : 0;
2521 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2522 gsf->gf_numsrc = count;
2523 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2524 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2525 return -EFAULT;
2526 }
2527 for (i = 0; i < copycount; i++) {
2528 struct sockaddr_storage ss;
2529
2530 psin = (struct sockaddr_in *)&ss;
2531 memset(&ss, 0, sizeof(ss));
2532 psin->sin_family = AF_INET;
2533 psin->sin_addr.s_addr = psl->sl_addr[i];
2534 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2535 return -EFAULT;
2536 }
2537 return 0;
2538 done:
2539 return err;
2540 }
2541
2542 /*
2543 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2544 */
2545 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2546 {
2547 struct inet_sock *inet = inet_sk(sk);
2548 struct ip_mc_socklist *pmc;
2549 struct ip_sf_socklist *psl;
2550 int i;
2551 int ret;
2552
2553 ret = 1;
2554 if (!ipv4_is_multicast(loc_addr))
2555 goto out;
2556
2557 rcu_read_lock();
2558 for_each_pmc_rcu(inet, pmc) {
2559 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2560 pmc->multi.imr_ifindex == dif)
2561 break;
2562 }
2563 ret = inet->mc_all;
2564 if (!pmc)
2565 goto unlock;
2566 psl = rcu_dereference(pmc->sflist);
2567 ret = (pmc->sfmode == MCAST_EXCLUDE);
2568 if (!psl)
2569 goto unlock;
2570
2571 for (i = 0; i < psl->sl_count; i++) {
2572 if (psl->sl_addr[i] == rmt_addr)
2573 break;
2574 }
2575 ret = 0;
2576 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2577 goto unlock;
2578 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2579 goto unlock;
2580 ret = 1;
2581 unlock:
2582 rcu_read_unlock();
2583 out:
2584 return ret;
2585 }
2586
2587 /*
2588 * A socket is closing.
2589 */
2590
2591 void ip_mc_drop_socket(struct sock *sk)
2592 {
2593 struct inet_sock *inet = inet_sk(sk);
2594 struct ip_mc_socklist *iml;
2595 struct net *net = sock_net(sk);
2596
2597 if (!inet->mc_list)
2598 return;
2599
2600 rtnl_lock();
2601 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2602 struct in_device *in_dev;
2603
2604 inet->mc_list = iml->next_rcu;
2605 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2606 (void) ip_mc_leave_src(sk, iml, in_dev);
2607 if (in_dev)
2608 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2609 /* decrease mem now to avoid the memleak warning */
2610 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2611 kfree_rcu(iml, rcu);
2612 }
2613 rtnl_unlock();
2614 }
2615
2616 /* called with rcu_read_lock() */
2617 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2618 {
2619 struct ip_mc_list *im;
2620 struct ip_mc_list __rcu **mc_hash;
2621 struct ip_sf_list *psf;
2622 int rv = 0;
2623
2624 mc_hash = rcu_dereference(in_dev->mc_hash);
2625 if (mc_hash) {
2626 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2627
2628 for (im = rcu_dereference(mc_hash[hash]);
2629 im != NULL;
2630 im = rcu_dereference(im->next_hash)) {
2631 if (im->multiaddr == mc_addr)
2632 break;
2633 }
2634 } else {
2635 for_each_pmc_rcu(in_dev, im) {
2636 if (im->multiaddr == mc_addr)
2637 break;
2638 }
2639 }
2640 if (im && proto == IPPROTO_IGMP) {
2641 rv = 1;
2642 } else if (im) {
2643 if (src_addr) {
2644 for (psf = im->sources; psf; psf = psf->sf_next) {
2645 if (psf->sf_inaddr == src_addr)
2646 break;
2647 }
2648 if (psf)
2649 rv = psf->sf_count[MCAST_INCLUDE] ||
2650 psf->sf_count[MCAST_EXCLUDE] !=
2651 im->sfcount[MCAST_EXCLUDE];
2652 else
2653 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2654 } else
2655 rv = 1; /* unspecified source; tentatively allow */
2656 }
2657 return rv;
2658 }
2659
2660 #if defined(CONFIG_PROC_FS)
2661 struct igmp_mc_iter_state {
2662 struct seq_net_private p;
2663 struct net_device *dev;
2664 struct in_device *in_dev;
2665 };
2666
2667 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2668
2669 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2670 {
2671 struct net *net = seq_file_net(seq);
2672 struct ip_mc_list *im = NULL;
2673 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2674
2675 state->in_dev = NULL;
2676 for_each_netdev_rcu(net, state->dev) {
2677 struct in_device *in_dev;
2678
2679 in_dev = __in_dev_get_rcu(state->dev);
2680 if (!in_dev)
2681 continue;
2682 im = rcu_dereference(in_dev->mc_list);
2683 if (im) {
2684 state->in_dev = in_dev;
2685 break;
2686 }
2687 }
2688 return im;
2689 }
2690
2691 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2692 {
2693 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2694
2695 im = rcu_dereference(im->next_rcu);
2696 while (!im) {
2697 state->dev = next_net_device_rcu(state->dev);
2698 if (!state->dev) {
2699 state->in_dev = NULL;
2700 break;
2701 }
2702 state->in_dev = __in_dev_get_rcu(state->dev);
2703 if (!state->in_dev)
2704 continue;
2705 im = rcu_dereference(state->in_dev->mc_list);
2706 }
2707 return im;
2708 }
2709
2710 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2711 {
2712 struct ip_mc_list *im = igmp_mc_get_first(seq);
2713 if (im)
2714 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2715 --pos;
2716 return pos ? NULL : im;
2717 }
2718
2719 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2720 __acquires(rcu)
2721 {
2722 rcu_read_lock();
2723 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2724 }
2725
2726 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2727 {
2728 struct ip_mc_list *im;
2729 if (v == SEQ_START_TOKEN)
2730 im = igmp_mc_get_first(seq);
2731 else
2732 im = igmp_mc_get_next(seq, v);
2733 ++*pos;
2734 return im;
2735 }
2736
2737 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2738 __releases(rcu)
2739 {
2740 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2741
2742 state->in_dev = NULL;
2743 state->dev = NULL;
2744 rcu_read_unlock();
2745 }
2746
2747 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2748 {
2749 if (v == SEQ_START_TOKEN)
2750 seq_puts(seq,
2751 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2752 else {
2753 struct ip_mc_list *im = (struct ip_mc_list *)v;
2754 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2755 char *querier;
2756 long delta;
2757
2758 #ifdef CONFIG_IP_MULTICAST
2759 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2760 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2761 "V3";
2762 #else
2763 querier = "NONE";
2764 #endif
2765
2766 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2767 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2768 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2769 }
2770
2771 delta = im->timer.expires - jiffies;
2772 seq_printf(seq,
2773 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2774 im->multiaddr, im->users,
2775 im->tm_running,
2776 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2777 im->reporter);
2778 }
2779 return 0;
2780 }
2781
2782 static const struct seq_operations igmp_mc_seq_ops = {
2783 .start = igmp_mc_seq_start,
2784 .next = igmp_mc_seq_next,
2785 .stop = igmp_mc_seq_stop,
2786 .show = igmp_mc_seq_show,
2787 };
2788
2789 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2790 {
2791 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2792 sizeof(struct igmp_mc_iter_state));
2793 }
2794
2795 static const struct file_operations igmp_mc_seq_fops = {
2796 .owner = THIS_MODULE,
2797 .open = igmp_mc_seq_open,
2798 .read = seq_read,
2799 .llseek = seq_lseek,
2800 .release = seq_release_net,
2801 };
2802
2803 struct igmp_mcf_iter_state {
2804 struct seq_net_private p;
2805 struct net_device *dev;
2806 struct in_device *idev;
2807 struct ip_mc_list *im;
2808 };
2809
2810 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2811
2812 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2813 {
2814 struct net *net = seq_file_net(seq);
2815 struct ip_sf_list *psf = NULL;
2816 struct ip_mc_list *im = NULL;
2817 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2818
2819 state->idev = NULL;
2820 state->im = NULL;
2821 for_each_netdev_rcu(net, state->dev) {
2822 struct in_device *idev;
2823 idev = __in_dev_get_rcu(state->dev);
2824 if (unlikely(!idev))
2825 continue;
2826 im = rcu_dereference(idev->mc_list);
2827 if (likely(im)) {
2828 spin_lock_bh(&im->lock);
2829 psf = im->sources;
2830 if (likely(psf)) {
2831 state->im = im;
2832 state->idev = idev;
2833 break;
2834 }
2835 spin_unlock_bh(&im->lock);
2836 }
2837 }
2838 return psf;
2839 }
2840
2841 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2842 {
2843 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2844
2845 psf = psf->sf_next;
2846 while (!psf) {
2847 spin_unlock_bh(&state->im->lock);
2848 state->im = state->im->next;
2849 while (!state->im) {
2850 state->dev = next_net_device_rcu(state->dev);
2851 if (!state->dev) {
2852 state->idev = NULL;
2853 goto out;
2854 }
2855 state->idev = __in_dev_get_rcu(state->dev);
2856 if (!state->idev)
2857 continue;
2858 state->im = rcu_dereference(state->idev->mc_list);
2859 }
2860 if (!state->im)
2861 break;
2862 spin_lock_bh(&state->im->lock);
2863 psf = state->im->sources;
2864 }
2865 out:
2866 return psf;
2867 }
2868
2869 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2870 {
2871 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2872 if (psf)
2873 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2874 --pos;
2875 return pos ? NULL : psf;
2876 }
2877
2878 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2879 __acquires(rcu)
2880 {
2881 rcu_read_lock();
2882 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2883 }
2884
2885 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2886 {
2887 struct ip_sf_list *psf;
2888 if (v == SEQ_START_TOKEN)
2889 psf = igmp_mcf_get_first(seq);
2890 else
2891 psf = igmp_mcf_get_next(seq, v);
2892 ++*pos;
2893 return psf;
2894 }
2895
2896 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2897 __releases(rcu)
2898 {
2899 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2900 if (likely(state->im)) {
2901 spin_unlock_bh(&state->im->lock);
2902 state->im = NULL;
2903 }
2904 state->idev = NULL;
2905 state->dev = NULL;
2906 rcu_read_unlock();
2907 }
2908
2909 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2910 {
2911 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2912 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2913
2914 if (v == SEQ_START_TOKEN) {
2915 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2916 } else {
2917 seq_printf(seq,
2918 "%3d %6.6s 0x%08x "
2919 "0x%08x %6lu %6lu\n",
2920 state->dev->ifindex, state->dev->name,
2921 ntohl(state->im->multiaddr),
2922 ntohl(psf->sf_inaddr),
2923 psf->sf_count[MCAST_INCLUDE],
2924 psf->sf_count[MCAST_EXCLUDE]);
2925 }
2926 return 0;
2927 }
2928
2929 static const struct seq_operations igmp_mcf_seq_ops = {
2930 .start = igmp_mcf_seq_start,
2931 .next = igmp_mcf_seq_next,
2932 .stop = igmp_mcf_seq_stop,
2933 .show = igmp_mcf_seq_show,
2934 };
2935
2936 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2937 {
2938 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2939 sizeof(struct igmp_mcf_iter_state));
2940 }
2941
2942 static const struct file_operations igmp_mcf_seq_fops = {
2943 .owner = THIS_MODULE,
2944 .open = igmp_mcf_seq_open,
2945 .read = seq_read,
2946 .llseek = seq_lseek,
2947 .release = seq_release_net,
2948 };
2949
2950 static int __net_init igmp_net_init(struct net *net)
2951 {
2952 struct proc_dir_entry *pde;
2953 int err;
2954
2955 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2956 if (!pde)
2957 goto out_igmp;
2958 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2959 &igmp_mcf_seq_fops);
2960 if (!pde)
2961 goto out_mcfilter;
2962 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2963 SOCK_DGRAM, 0, net);
2964 if (err < 0) {
2965 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2966 err);
2967 goto out_sock;
2968 }
2969
2970 /* Sysctl initialization */
2971 net->ipv4.sysctl_igmp_max_memberships = 20;
2972 net->ipv4.sysctl_igmp_max_msf = 10;
2973 /* IGMP reports for link-local multicast groups are enabled by default */
2974 net->ipv4.sysctl_igmp_llm_reports = 1;
2975 net->ipv4.sysctl_igmp_qrv = 2;
2976 return 0;
2977
2978 out_sock:
2979 remove_proc_entry("mcfilter", net->proc_net);
2980 out_mcfilter:
2981 remove_proc_entry("igmp", net->proc_net);
2982 out_igmp:
2983 return -ENOMEM;
2984 }
2985
2986 static void __net_exit igmp_net_exit(struct net *net)
2987 {
2988 remove_proc_entry("mcfilter", net->proc_net);
2989 remove_proc_entry("igmp", net->proc_net);
2990 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2991 }
2992
2993 static struct pernet_operations igmp_net_ops = {
2994 .init = igmp_net_init,
2995 .exit = igmp_net_exit,
2996 };
2997 #endif
2998
2999 static int igmp_netdev_event(struct notifier_block *this,
3000 unsigned long event, void *ptr)
3001 {
3002 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3003 struct in_device *in_dev;
3004
3005 switch (event) {
3006 case NETDEV_RESEND_IGMP:
3007 in_dev = __in_dev_get_rtnl(dev);
3008 if (in_dev)
3009 ip_mc_rejoin_groups(in_dev);
3010 break;
3011 default:
3012 break;
3013 }
3014 return NOTIFY_DONE;
3015 }
3016
3017 static struct notifier_block igmp_notifier = {
3018 .notifier_call = igmp_netdev_event,
3019 };
3020
3021 int __init igmp_mc_init(void)
3022 {
3023 #if defined(CONFIG_PROC_FS)
3024 int err;
3025
3026 err = register_pernet_subsys(&igmp_net_ops);
3027 if (err)
3028 return err;
3029 err = register_netdevice_notifier(&igmp_notifier);
3030 if (err)
3031 goto reg_notif_fail;
3032 return 0;
3033
3034 reg_notif_fail:
3035 unregister_pernet_subsys(&igmp_net_ops);
3036 return err;
3037 #else
3038 return register_netdevice_notifier(&igmp_notifier);
3039 #endif
3040 }
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