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Merge remote-tracking branch 'regulator/fix/max77802' into regulator-linus
[mirror_ubuntu-artful-kernel.git] / net / ipv4 / igmp.c
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_init(&pmc->lock);
1116 spin_lock_bh(&im->lock);
1117 pmc->interface = im->interface;
1118 in_dev_hold(in_dev);
1119 pmc->multiaddr = im->multiaddr;
1120 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1121 pmc->sfmode = im->sfmode;
1122 if (pmc->sfmode == MCAST_INCLUDE) {
1123 struct ip_sf_list *psf;
1124
1125 pmc->tomb = im->tomb;
1126 pmc->sources = im->sources;
1127 im->tomb = im->sources = NULL;
1128 for (psf = pmc->sources; psf; psf = psf->sf_next)
1129 psf->sf_crcount = pmc->crcount;
1130 }
1131 spin_unlock_bh(&im->lock);
1132
1133 spin_lock_bh(&in_dev->mc_tomb_lock);
1134 pmc->next = in_dev->mc_tomb;
1135 in_dev->mc_tomb = pmc;
1136 spin_unlock_bh(&in_dev->mc_tomb_lock);
1137 }
1138
1139 /*
1140 * restore ip_mc_list deleted records
1141 */
1142 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1143 {
1144 struct ip_mc_list *pmc, *pmc_prev;
1145 struct ip_sf_list *psf;
1146 struct net *net = dev_net(in_dev->dev);
1147 __be32 multiaddr = im->multiaddr;
1148
1149 spin_lock_bh(&in_dev->mc_tomb_lock);
1150 pmc_prev = NULL;
1151 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1152 if (pmc->multiaddr == multiaddr)
1153 break;
1154 pmc_prev = pmc;
1155 }
1156 if (pmc) {
1157 if (pmc_prev)
1158 pmc_prev->next = pmc->next;
1159 else
1160 in_dev->mc_tomb = pmc->next;
1161 }
1162 spin_unlock_bh(&in_dev->mc_tomb_lock);
1163
1164 spin_lock_bh(&im->lock);
1165 if (pmc) {
1166 im->interface = pmc->interface;
1167 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1168 im->sfmode = pmc->sfmode;
1169 if (pmc->sfmode == MCAST_INCLUDE) {
1170 im->tomb = pmc->tomb;
1171 im->sources = pmc->sources;
1172 for (psf = im->sources; psf; psf = psf->sf_next)
1173 psf->sf_crcount = im->crcount;
1174 }
1175 in_dev_put(pmc->interface);
1176 kfree(pmc);
1177 }
1178 spin_unlock_bh(&im->lock);
1179 }
1180
1181 /*
1182 * flush ip_mc_list deleted records
1183 */
1184 static void igmpv3_clear_delrec(struct in_device *in_dev)
1185 {
1186 struct ip_mc_list *pmc, *nextpmc;
1187
1188 spin_lock_bh(&in_dev->mc_tomb_lock);
1189 pmc = in_dev->mc_tomb;
1190 in_dev->mc_tomb = NULL;
1191 spin_unlock_bh(&in_dev->mc_tomb_lock);
1192
1193 for (; pmc; pmc = nextpmc) {
1194 nextpmc = pmc->next;
1195 ip_mc_clear_src(pmc);
1196 in_dev_put(pmc->interface);
1197 kfree(pmc);
1198 }
1199 /* clear dead sources, too */
1200 rcu_read_lock();
1201 for_each_pmc_rcu(in_dev, pmc) {
1202 struct ip_sf_list *psf, *psf_next;
1203
1204 spin_lock_bh(&pmc->lock);
1205 psf = pmc->tomb;
1206 pmc->tomb = NULL;
1207 spin_unlock_bh(&pmc->lock);
1208 for (; psf; psf = psf_next) {
1209 psf_next = psf->sf_next;
1210 kfree(psf);
1211 }
1212 }
1213 rcu_read_unlock();
1214 }
1215 #endif
1216
1217 static void igmp_group_dropped(struct ip_mc_list *im)
1218 {
1219 struct in_device *in_dev = im->interface;
1220 #ifdef CONFIG_IP_MULTICAST
1221 struct net *net = dev_net(in_dev->dev);
1222 int reporter;
1223 #endif
1224
1225 if (im->loaded) {
1226 im->loaded = 0;
1227 ip_mc_filter_del(in_dev, im->multiaddr);
1228 }
1229
1230 #ifdef CONFIG_IP_MULTICAST
1231 if (im->multiaddr == IGMP_ALL_HOSTS)
1232 return;
1233 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1234 return;
1235
1236 reporter = im->reporter;
1237 igmp_stop_timer(im);
1238
1239 if (!in_dev->dead) {
1240 if (IGMP_V1_SEEN(in_dev))
1241 return;
1242 if (IGMP_V2_SEEN(in_dev)) {
1243 if (reporter)
1244 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1245 return;
1246 }
1247 /* IGMPv3 */
1248 igmpv3_add_delrec(in_dev, im);
1249
1250 igmp_ifc_event(in_dev);
1251 }
1252 #endif
1253 }
1254
1255 static void igmp_group_added(struct ip_mc_list *im)
1256 {
1257 struct in_device *in_dev = im->interface;
1258 #ifdef CONFIG_IP_MULTICAST
1259 struct net *net = dev_net(in_dev->dev);
1260 #endif
1261
1262 if (im->loaded == 0) {
1263 im->loaded = 1;
1264 ip_mc_filter_add(in_dev, im->multiaddr);
1265 }
1266
1267 #ifdef CONFIG_IP_MULTICAST
1268 if (im->multiaddr == IGMP_ALL_HOSTS)
1269 return;
1270 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1271 return;
1272
1273 if (in_dev->dead)
1274 return;
1275 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1276 spin_lock_bh(&im->lock);
1277 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1278 spin_unlock_bh(&im->lock);
1279 return;
1280 }
1281 /* else, v3 */
1282
1283 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1284 igmp_ifc_event(in_dev);
1285 #endif
1286 }
1287
1288
1289 /*
1290 * Multicast list managers
1291 */
1292
1293 static u32 ip_mc_hash(const struct ip_mc_list *im)
1294 {
1295 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1296 }
1297
1298 static void ip_mc_hash_add(struct in_device *in_dev,
1299 struct ip_mc_list *im)
1300 {
1301 struct ip_mc_list __rcu **mc_hash;
1302 u32 hash;
1303
1304 mc_hash = rtnl_dereference(in_dev->mc_hash);
1305 if (mc_hash) {
1306 hash = ip_mc_hash(im);
1307 im->next_hash = mc_hash[hash];
1308 rcu_assign_pointer(mc_hash[hash], im);
1309 return;
1310 }
1311
1312 /* do not use a hash table for small number of items */
1313 if (in_dev->mc_count < 4)
1314 return;
1315
1316 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1317 GFP_KERNEL);
1318 if (!mc_hash)
1319 return;
1320
1321 for_each_pmc_rtnl(in_dev, im) {
1322 hash = ip_mc_hash(im);
1323 im->next_hash = mc_hash[hash];
1324 RCU_INIT_POINTER(mc_hash[hash], im);
1325 }
1326
1327 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1328 }
1329
1330 static void ip_mc_hash_remove(struct in_device *in_dev,
1331 struct ip_mc_list *im)
1332 {
1333 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1334 struct ip_mc_list *aux;
1335
1336 if (!mc_hash)
1337 return;
1338 mc_hash += ip_mc_hash(im);
1339 while ((aux = rtnl_dereference(*mc_hash)) != im)
1340 mc_hash = &aux->next_hash;
1341 *mc_hash = im->next_hash;
1342 }
1343
1344
1345 /*
1346 * A socket has joined a multicast group on device dev.
1347 */
1348
1349 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1350 {
1351 struct ip_mc_list *im;
1352 #ifdef CONFIG_IP_MULTICAST
1353 struct net *net = dev_net(in_dev->dev);
1354 #endif
1355
1356 ASSERT_RTNL();
1357
1358 for_each_pmc_rtnl(in_dev, im) {
1359 if (im->multiaddr == addr) {
1360 im->users++;
1361 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1362 goto out;
1363 }
1364 }
1365
1366 im = kzalloc(sizeof(*im), GFP_KERNEL);
1367 if (!im)
1368 goto out;
1369
1370 im->users = 1;
1371 im->interface = in_dev;
1372 in_dev_hold(in_dev);
1373 im->multiaddr = addr;
1374 /* initial mode is (EX, empty) */
1375 im->sfmode = MCAST_EXCLUDE;
1376 im->sfcount[MCAST_EXCLUDE] = 1;
1377 atomic_set(&im->refcnt, 1);
1378 spin_lock_init(&im->lock);
1379 #ifdef CONFIG_IP_MULTICAST
1380 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1381 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1382 #endif
1383
1384 im->next_rcu = in_dev->mc_list;
1385 in_dev->mc_count++;
1386 rcu_assign_pointer(in_dev->mc_list, im);
1387
1388 ip_mc_hash_add(in_dev, im);
1389
1390 #ifdef CONFIG_IP_MULTICAST
1391 igmpv3_del_delrec(in_dev, im);
1392 #endif
1393 igmp_group_added(im);
1394 if (!in_dev->dead)
1395 ip_rt_multicast_event(in_dev);
1396 out:
1397 return;
1398 }
1399 EXPORT_SYMBOL(ip_mc_inc_group);
1400
1401 static int ip_mc_check_iphdr(struct sk_buff *skb)
1402 {
1403 const struct iphdr *iph;
1404 unsigned int len;
1405 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1406
1407 if (!pskb_may_pull(skb, offset))
1408 return -EINVAL;
1409
1410 iph = ip_hdr(skb);
1411
1412 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1413 return -EINVAL;
1414
1415 offset += ip_hdrlen(skb) - sizeof(*iph);
1416
1417 if (!pskb_may_pull(skb, offset))
1418 return -EINVAL;
1419
1420 iph = ip_hdr(skb);
1421
1422 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1423 return -EINVAL;
1424
1425 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1426 if (skb->len < len || len < offset)
1427 return -EINVAL;
1428
1429 skb_set_transport_header(skb, offset);
1430
1431 return 0;
1432 }
1433
1434 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1435 {
1436 unsigned int len = skb_transport_offset(skb);
1437
1438 len += sizeof(struct igmpv3_report);
1439
1440 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1441 }
1442
1443 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1444 {
1445 unsigned int len = skb_transport_offset(skb);
1446
1447 len += sizeof(struct igmphdr);
1448 if (skb->len < len)
1449 return -EINVAL;
1450
1451 /* IGMPv{1,2}? */
1452 if (skb->len != len) {
1453 /* or IGMPv3? */
1454 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1455 if (skb->len < len || !pskb_may_pull(skb, len))
1456 return -EINVAL;
1457 }
1458
1459 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1460 * all-systems destination addresses (224.0.0.1) for general queries
1461 */
1462 if (!igmp_hdr(skb)->group &&
1463 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1464 return -EINVAL;
1465
1466 return 0;
1467 }
1468
1469 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1470 {
1471 switch (igmp_hdr(skb)->type) {
1472 case IGMP_HOST_LEAVE_MESSAGE:
1473 case IGMP_HOST_MEMBERSHIP_REPORT:
1474 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1475 /* fall through */
1476 return 0;
1477 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1478 return ip_mc_check_igmp_reportv3(skb);
1479 case IGMP_HOST_MEMBERSHIP_QUERY:
1480 return ip_mc_check_igmp_query(skb);
1481 default:
1482 return -ENOMSG;
1483 }
1484 }
1485
1486 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1487 {
1488 return skb_checksum_simple_validate(skb);
1489 }
1490
1491 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1492
1493 {
1494 struct sk_buff *skb_chk;
1495 unsigned int transport_len;
1496 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1497 int ret = -EINVAL;
1498
1499 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1500
1501 skb_chk = skb_checksum_trimmed(skb, transport_len,
1502 ip_mc_validate_checksum);
1503 if (!skb_chk)
1504 goto err;
1505
1506 if (!pskb_may_pull(skb_chk, len))
1507 goto err;
1508
1509 ret = ip_mc_check_igmp_msg(skb_chk);
1510 if (ret)
1511 goto err;
1512
1513 if (skb_trimmed)
1514 *skb_trimmed = skb_chk;
1515 /* free now unneeded clone */
1516 else if (skb_chk != skb)
1517 kfree_skb(skb_chk);
1518
1519 ret = 0;
1520
1521 err:
1522 if (ret && skb_chk && skb_chk != skb)
1523 kfree_skb(skb_chk);
1524
1525 return ret;
1526 }
1527
1528 /**
1529 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1530 * @skb: the skb to validate
1531 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1532 *
1533 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1534 * skb transport header accordingly and returns zero.
1535 *
1536 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1537 * standard
1538 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1539 * -ENOMEM: A memory allocation failure happened.
1540 *
1541 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1542 * to NULL): After parsing an IGMP packet successfully it will point to
1543 * an skb which has its tail aligned to the IP packet end. This might
1544 * either be the originally provided skb or a trimmed, cloned version if
1545 * the skb frame had data beyond the IP packet. A cloned skb allows us
1546 * to leave the original skb and its full frame unchanged (which might be
1547 * desirable for layer 2 frame jugglers).
1548 *
1549 * Caller needs to set the skb network header and free any returned skb if it
1550 * differs from the provided skb.
1551 */
1552 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1553 {
1554 int ret = ip_mc_check_iphdr(skb);
1555
1556 if (ret < 0)
1557 return ret;
1558
1559 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1560 return -ENOMSG;
1561
1562 return __ip_mc_check_igmp(skb, skb_trimmed);
1563 }
1564 EXPORT_SYMBOL(ip_mc_check_igmp);
1565
1566 /*
1567 * Resend IGMP JOIN report; used by netdev notifier.
1568 */
1569 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1570 {
1571 #ifdef CONFIG_IP_MULTICAST
1572 struct ip_mc_list *im;
1573 int type;
1574 struct net *net = dev_net(in_dev->dev);
1575
1576 ASSERT_RTNL();
1577
1578 for_each_pmc_rtnl(in_dev, im) {
1579 if (im->multiaddr == IGMP_ALL_HOSTS)
1580 continue;
1581 if (ipv4_is_local_multicast(im->multiaddr) &&
1582 !net->ipv4.sysctl_igmp_llm_reports)
1583 continue;
1584
1585 /* a failover is happening and switches
1586 * must be notified immediately
1587 */
1588 if (IGMP_V1_SEEN(in_dev))
1589 type = IGMP_HOST_MEMBERSHIP_REPORT;
1590 else if (IGMP_V2_SEEN(in_dev))
1591 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1592 else
1593 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1594 igmp_send_report(in_dev, im, type);
1595 }
1596 #endif
1597 }
1598
1599 /*
1600 * A socket has left a multicast group on device dev
1601 */
1602
1603 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1604 {
1605 struct ip_mc_list *i;
1606 struct ip_mc_list __rcu **ip;
1607
1608 ASSERT_RTNL();
1609
1610 for (ip = &in_dev->mc_list;
1611 (i = rtnl_dereference(*ip)) != NULL;
1612 ip = &i->next_rcu) {
1613 if (i->multiaddr == addr) {
1614 if (--i->users == 0) {
1615 ip_mc_hash_remove(in_dev, i);
1616 *ip = i->next_rcu;
1617 in_dev->mc_count--;
1618 igmp_group_dropped(i);
1619 ip_mc_clear_src(i);
1620
1621 if (!in_dev->dead)
1622 ip_rt_multicast_event(in_dev);
1623
1624 ip_ma_put(i);
1625 return;
1626 }
1627 break;
1628 }
1629 }
1630 }
1631 EXPORT_SYMBOL(ip_mc_dec_group);
1632
1633 /* Device changing type */
1634
1635 void ip_mc_unmap(struct in_device *in_dev)
1636 {
1637 struct ip_mc_list *pmc;
1638
1639 ASSERT_RTNL();
1640
1641 for_each_pmc_rtnl(in_dev, pmc)
1642 igmp_group_dropped(pmc);
1643 }
1644
1645 void ip_mc_remap(struct in_device *in_dev)
1646 {
1647 struct ip_mc_list *pmc;
1648
1649 ASSERT_RTNL();
1650
1651 for_each_pmc_rtnl(in_dev, pmc) {
1652 #ifdef CONFIG_IP_MULTICAST
1653 igmpv3_del_delrec(in_dev, pmc);
1654 #endif
1655 igmp_group_added(pmc);
1656 }
1657 }
1658
1659 /* Device going down */
1660
1661 void ip_mc_down(struct in_device *in_dev)
1662 {
1663 struct ip_mc_list *pmc;
1664
1665 ASSERT_RTNL();
1666
1667 for_each_pmc_rtnl(in_dev, pmc)
1668 igmp_group_dropped(pmc);
1669
1670 #ifdef CONFIG_IP_MULTICAST
1671 in_dev->mr_ifc_count = 0;
1672 if (del_timer(&in_dev->mr_ifc_timer))
1673 __in_dev_put(in_dev);
1674 in_dev->mr_gq_running = 0;
1675 if (del_timer(&in_dev->mr_gq_timer))
1676 __in_dev_put(in_dev);
1677 #endif
1678
1679 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1680 }
1681
1682 void ip_mc_init_dev(struct in_device *in_dev)
1683 {
1684 #ifdef CONFIG_IP_MULTICAST
1685 struct net *net = dev_net(in_dev->dev);
1686 #endif
1687 ASSERT_RTNL();
1688
1689 #ifdef CONFIG_IP_MULTICAST
1690 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1691 (unsigned long)in_dev);
1692 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1693 (unsigned long)in_dev);
1694 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1695 #endif
1696
1697 spin_lock_init(&in_dev->mc_tomb_lock);
1698 }
1699
1700 /* Device going up */
1701
1702 void ip_mc_up(struct in_device *in_dev)
1703 {
1704 struct ip_mc_list *pmc;
1705 #ifdef CONFIG_IP_MULTICAST
1706 struct net *net = dev_net(in_dev->dev);
1707 #endif
1708
1709 ASSERT_RTNL();
1710
1711 #ifdef CONFIG_IP_MULTICAST
1712 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1713 #endif
1714 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1715
1716 for_each_pmc_rtnl(in_dev, pmc) {
1717 #ifdef CONFIG_IP_MULTICAST
1718 igmpv3_del_delrec(in_dev, pmc);
1719 #endif
1720 igmp_group_added(pmc);
1721 }
1722 }
1723
1724 /*
1725 * Device is about to be destroyed: clean up.
1726 */
1727
1728 void ip_mc_destroy_dev(struct in_device *in_dev)
1729 {
1730 struct ip_mc_list *i;
1731
1732 ASSERT_RTNL();
1733
1734 /* Deactivate timers */
1735 ip_mc_down(in_dev);
1736 #ifdef CONFIG_IP_MULTICAST
1737 igmpv3_clear_delrec(in_dev);
1738 #endif
1739
1740 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1741 in_dev->mc_list = i->next_rcu;
1742 in_dev->mc_count--;
1743 ip_ma_put(i);
1744 }
1745 }
1746
1747 /* RTNL is locked */
1748 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1749 {
1750 struct net_device *dev = NULL;
1751 struct in_device *idev = NULL;
1752
1753 if (imr->imr_ifindex) {
1754 idev = inetdev_by_index(net, imr->imr_ifindex);
1755 return idev;
1756 }
1757 if (imr->imr_address.s_addr) {
1758 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1759 if (!dev)
1760 return NULL;
1761 }
1762
1763 if (!dev) {
1764 struct rtable *rt = ip_route_output(net,
1765 imr->imr_multiaddr.s_addr,
1766 0, 0, 0);
1767 if (!IS_ERR(rt)) {
1768 dev = rt->dst.dev;
1769 ip_rt_put(rt);
1770 }
1771 }
1772 if (dev) {
1773 imr->imr_ifindex = dev->ifindex;
1774 idev = __in_dev_get_rtnl(dev);
1775 }
1776 return idev;
1777 }
1778
1779 /*
1780 * Join a socket to a group
1781 */
1782
1783 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1784 __be32 *psfsrc)
1785 {
1786 struct ip_sf_list *psf, *psf_prev;
1787 int rv = 0;
1788
1789 psf_prev = NULL;
1790 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1791 if (psf->sf_inaddr == *psfsrc)
1792 break;
1793 psf_prev = psf;
1794 }
1795 if (!psf || psf->sf_count[sfmode] == 0) {
1796 /* source filter not found, or count wrong => bug */
1797 return -ESRCH;
1798 }
1799 psf->sf_count[sfmode]--;
1800 if (psf->sf_count[sfmode] == 0) {
1801 ip_rt_multicast_event(pmc->interface);
1802 }
1803 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1804 #ifdef CONFIG_IP_MULTICAST
1805 struct in_device *in_dev = pmc->interface;
1806 struct net *net = dev_net(in_dev->dev);
1807 #endif
1808
1809 /* no more filters for this source */
1810 if (psf_prev)
1811 psf_prev->sf_next = psf->sf_next;
1812 else
1813 pmc->sources = psf->sf_next;
1814 #ifdef CONFIG_IP_MULTICAST
1815 if (psf->sf_oldin &&
1816 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1817 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1818 psf->sf_next = pmc->tomb;
1819 pmc->tomb = psf;
1820 rv = 1;
1821 } else
1822 #endif
1823 kfree(psf);
1824 }
1825 return rv;
1826 }
1827
1828 #ifndef CONFIG_IP_MULTICAST
1829 #define igmp_ifc_event(x) do { } while (0)
1830 #endif
1831
1832 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1833 int sfcount, __be32 *psfsrc, int delta)
1834 {
1835 struct ip_mc_list *pmc;
1836 int changerec = 0;
1837 int i, err;
1838
1839 if (!in_dev)
1840 return -ENODEV;
1841 rcu_read_lock();
1842 for_each_pmc_rcu(in_dev, pmc) {
1843 if (*pmca == pmc->multiaddr)
1844 break;
1845 }
1846 if (!pmc) {
1847 /* MCA not found?? bug */
1848 rcu_read_unlock();
1849 return -ESRCH;
1850 }
1851 spin_lock_bh(&pmc->lock);
1852 rcu_read_unlock();
1853 #ifdef CONFIG_IP_MULTICAST
1854 sf_markstate(pmc);
1855 #endif
1856 if (!delta) {
1857 err = -EINVAL;
1858 if (!pmc->sfcount[sfmode])
1859 goto out_unlock;
1860 pmc->sfcount[sfmode]--;
1861 }
1862 err = 0;
1863 for (i = 0; i < sfcount; i++) {
1864 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1865
1866 changerec |= rv > 0;
1867 if (!err && rv < 0)
1868 err = rv;
1869 }
1870 if (pmc->sfmode == MCAST_EXCLUDE &&
1871 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1872 pmc->sfcount[MCAST_INCLUDE]) {
1873 #ifdef CONFIG_IP_MULTICAST
1874 struct ip_sf_list *psf;
1875 struct net *net = dev_net(in_dev->dev);
1876 #endif
1877
1878 /* filter mode change */
1879 pmc->sfmode = MCAST_INCLUDE;
1880 #ifdef CONFIG_IP_MULTICAST
1881 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1882 in_dev->mr_ifc_count = pmc->crcount;
1883 for (psf = pmc->sources; psf; psf = psf->sf_next)
1884 psf->sf_crcount = 0;
1885 igmp_ifc_event(pmc->interface);
1886 } else if (sf_setstate(pmc) || changerec) {
1887 igmp_ifc_event(pmc->interface);
1888 #endif
1889 }
1890 out_unlock:
1891 spin_unlock_bh(&pmc->lock);
1892 return err;
1893 }
1894
1895 /*
1896 * Add multicast single-source filter to the interface list
1897 */
1898 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1899 __be32 *psfsrc)
1900 {
1901 struct ip_sf_list *psf, *psf_prev;
1902
1903 psf_prev = NULL;
1904 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1905 if (psf->sf_inaddr == *psfsrc)
1906 break;
1907 psf_prev = psf;
1908 }
1909 if (!psf) {
1910 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1911 if (!psf)
1912 return -ENOBUFS;
1913 psf->sf_inaddr = *psfsrc;
1914 if (psf_prev) {
1915 psf_prev->sf_next = psf;
1916 } else
1917 pmc->sources = psf;
1918 }
1919 psf->sf_count[sfmode]++;
1920 if (psf->sf_count[sfmode] == 1) {
1921 ip_rt_multicast_event(pmc->interface);
1922 }
1923 return 0;
1924 }
1925
1926 #ifdef CONFIG_IP_MULTICAST
1927 static void sf_markstate(struct ip_mc_list *pmc)
1928 {
1929 struct ip_sf_list *psf;
1930 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1931
1932 for (psf = pmc->sources; psf; psf = psf->sf_next)
1933 if (pmc->sfcount[MCAST_EXCLUDE]) {
1934 psf->sf_oldin = mca_xcount ==
1935 psf->sf_count[MCAST_EXCLUDE] &&
1936 !psf->sf_count[MCAST_INCLUDE];
1937 } else
1938 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1939 }
1940
1941 static int sf_setstate(struct ip_mc_list *pmc)
1942 {
1943 struct ip_sf_list *psf, *dpsf;
1944 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1945 int qrv = pmc->interface->mr_qrv;
1946 int new_in, rv;
1947
1948 rv = 0;
1949 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1950 if (pmc->sfcount[MCAST_EXCLUDE]) {
1951 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1952 !psf->sf_count[MCAST_INCLUDE];
1953 } else
1954 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1955 if (new_in) {
1956 if (!psf->sf_oldin) {
1957 struct ip_sf_list *prev = NULL;
1958
1959 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1960 if (dpsf->sf_inaddr == psf->sf_inaddr)
1961 break;
1962 prev = dpsf;
1963 }
1964 if (dpsf) {
1965 if (prev)
1966 prev->sf_next = dpsf->sf_next;
1967 else
1968 pmc->tomb = dpsf->sf_next;
1969 kfree(dpsf);
1970 }
1971 psf->sf_crcount = qrv;
1972 rv++;
1973 }
1974 } else if (psf->sf_oldin) {
1975
1976 psf->sf_crcount = 0;
1977 /*
1978 * add or update "delete" records if an active filter
1979 * is now inactive
1980 */
1981 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1982 if (dpsf->sf_inaddr == psf->sf_inaddr)
1983 break;
1984 if (!dpsf) {
1985 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1986 if (!dpsf)
1987 continue;
1988 *dpsf = *psf;
1989 /* pmc->lock held by callers */
1990 dpsf->sf_next = pmc->tomb;
1991 pmc->tomb = dpsf;
1992 }
1993 dpsf->sf_crcount = qrv;
1994 rv++;
1995 }
1996 }
1997 return rv;
1998 }
1999 #endif
2000
2001 /*
2002 * Add multicast source filter list to the interface list
2003 */
2004 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2005 int sfcount, __be32 *psfsrc, int delta)
2006 {
2007 struct ip_mc_list *pmc;
2008 int isexclude;
2009 int i, err;
2010
2011 if (!in_dev)
2012 return -ENODEV;
2013 rcu_read_lock();
2014 for_each_pmc_rcu(in_dev, pmc) {
2015 if (*pmca == pmc->multiaddr)
2016 break;
2017 }
2018 if (!pmc) {
2019 /* MCA not found?? bug */
2020 rcu_read_unlock();
2021 return -ESRCH;
2022 }
2023 spin_lock_bh(&pmc->lock);
2024 rcu_read_unlock();
2025
2026 #ifdef CONFIG_IP_MULTICAST
2027 sf_markstate(pmc);
2028 #endif
2029 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2030 if (!delta)
2031 pmc->sfcount[sfmode]++;
2032 err = 0;
2033 for (i = 0; i < sfcount; i++) {
2034 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2035 if (err)
2036 break;
2037 }
2038 if (err) {
2039 int j;
2040
2041 if (!delta)
2042 pmc->sfcount[sfmode]--;
2043 for (j = 0; j < i; j++)
2044 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2045 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2046 #ifdef CONFIG_IP_MULTICAST
2047 struct ip_sf_list *psf;
2048 struct net *net = dev_net(pmc->interface->dev);
2049 in_dev = pmc->interface;
2050 #endif
2051
2052 /* filter mode change */
2053 if (pmc->sfcount[MCAST_EXCLUDE])
2054 pmc->sfmode = MCAST_EXCLUDE;
2055 else if (pmc->sfcount[MCAST_INCLUDE])
2056 pmc->sfmode = MCAST_INCLUDE;
2057 #ifdef CONFIG_IP_MULTICAST
2058 /* else no filters; keep old mode for reports */
2059
2060 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2061 in_dev->mr_ifc_count = pmc->crcount;
2062 for (psf = pmc->sources; psf; psf = psf->sf_next)
2063 psf->sf_crcount = 0;
2064 igmp_ifc_event(in_dev);
2065 } else if (sf_setstate(pmc)) {
2066 igmp_ifc_event(in_dev);
2067 #endif
2068 }
2069 spin_unlock_bh(&pmc->lock);
2070 return err;
2071 }
2072
2073 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2074 {
2075 struct ip_sf_list *psf, *nextpsf, *tomb, *sources;
2076
2077 spin_lock_bh(&pmc->lock);
2078 tomb = pmc->tomb;
2079 pmc->tomb = NULL;
2080 sources = pmc->sources;
2081 pmc->sources = NULL;
2082 pmc->sfmode = MCAST_EXCLUDE;
2083 pmc->sfcount[MCAST_INCLUDE] = 0;
2084 pmc->sfcount[MCAST_EXCLUDE] = 1;
2085 spin_unlock_bh(&pmc->lock);
2086
2087 for (psf = tomb; psf; psf = nextpsf) {
2088 nextpsf = psf->sf_next;
2089 kfree(psf);
2090 }
2091 for (psf = sources; psf; psf = nextpsf) {
2092 nextpsf = psf->sf_next;
2093 kfree(psf);
2094 }
2095 }
2096
2097 /* Join a multicast group
2098 */
2099
2100 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2101 {
2102 __be32 addr = imr->imr_multiaddr.s_addr;
2103 struct ip_mc_socklist *iml, *i;
2104 struct in_device *in_dev;
2105 struct inet_sock *inet = inet_sk(sk);
2106 struct net *net = sock_net(sk);
2107 int ifindex;
2108 int count = 0;
2109 int err;
2110
2111 ASSERT_RTNL();
2112
2113 if (!ipv4_is_multicast(addr))
2114 return -EINVAL;
2115
2116 in_dev = ip_mc_find_dev(net, imr);
2117
2118 if (!in_dev) {
2119 err = -ENODEV;
2120 goto done;
2121 }
2122
2123 err = -EADDRINUSE;
2124 ifindex = imr->imr_ifindex;
2125 for_each_pmc_rtnl(inet, i) {
2126 if (i->multi.imr_multiaddr.s_addr == addr &&
2127 i->multi.imr_ifindex == ifindex)
2128 goto done;
2129 count++;
2130 }
2131 err = -ENOBUFS;
2132 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2133 goto done;
2134 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2135 if (!iml)
2136 goto done;
2137
2138 memcpy(&iml->multi, imr, sizeof(*imr));
2139 iml->next_rcu = inet->mc_list;
2140 iml->sflist = NULL;
2141 iml->sfmode = MCAST_EXCLUDE;
2142 rcu_assign_pointer(inet->mc_list, iml);
2143 ip_mc_inc_group(in_dev, addr);
2144 err = 0;
2145 done:
2146 return err;
2147 }
2148 EXPORT_SYMBOL(ip_mc_join_group);
2149
2150 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2151 struct in_device *in_dev)
2152 {
2153 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2154 int err;
2155
2156 if (!psf) {
2157 /* any-source empty exclude case */
2158 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2159 iml->sfmode, 0, NULL, 0);
2160 }
2161 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2162 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2163 RCU_INIT_POINTER(iml->sflist, NULL);
2164 /* decrease mem now to avoid the memleak warning */
2165 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2166 kfree_rcu(psf, rcu);
2167 return err;
2168 }
2169
2170 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2171 {
2172 struct inet_sock *inet = inet_sk(sk);
2173 struct ip_mc_socklist *iml;
2174 struct ip_mc_socklist __rcu **imlp;
2175 struct in_device *in_dev;
2176 struct net *net = sock_net(sk);
2177 __be32 group = imr->imr_multiaddr.s_addr;
2178 u32 ifindex;
2179 int ret = -EADDRNOTAVAIL;
2180
2181 ASSERT_RTNL();
2182
2183 in_dev = ip_mc_find_dev(net, imr);
2184 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2185 ret = -ENODEV;
2186 goto out;
2187 }
2188 ifindex = imr->imr_ifindex;
2189 for (imlp = &inet->mc_list;
2190 (iml = rtnl_dereference(*imlp)) != NULL;
2191 imlp = &iml->next_rcu) {
2192 if (iml->multi.imr_multiaddr.s_addr != group)
2193 continue;
2194 if (ifindex) {
2195 if (iml->multi.imr_ifindex != ifindex)
2196 continue;
2197 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2198 iml->multi.imr_address.s_addr)
2199 continue;
2200
2201 (void) ip_mc_leave_src(sk, iml, in_dev);
2202
2203 *imlp = iml->next_rcu;
2204
2205 if (in_dev)
2206 ip_mc_dec_group(in_dev, group);
2207
2208 /* decrease mem now to avoid the memleak warning */
2209 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2210 kfree_rcu(iml, rcu);
2211 return 0;
2212 }
2213 out:
2214 return ret;
2215 }
2216 EXPORT_SYMBOL(ip_mc_leave_group);
2217
2218 int ip_mc_source(int add, int omode, struct sock *sk, struct
2219 ip_mreq_source *mreqs, int ifindex)
2220 {
2221 int err;
2222 struct ip_mreqn imr;
2223 __be32 addr = mreqs->imr_multiaddr;
2224 struct ip_mc_socklist *pmc;
2225 struct in_device *in_dev = NULL;
2226 struct inet_sock *inet = inet_sk(sk);
2227 struct ip_sf_socklist *psl;
2228 struct net *net = sock_net(sk);
2229 int leavegroup = 0;
2230 int i, j, rv;
2231
2232 if (!ipv4_is_multicast(addr))
2233 return -EINVAL;
2234
2235 ASSERT_RTNL();
2236
2237 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2238 imr.imr_address.s_addr = mreqs->imr_interface;
2239 imr.imr_ifindex = ifindex;
2240 in_dev = ip_mc_find_dev(net, &imr);
2241
2242 if (!in_dev) {
2243 err = -ENODEV;
2244 goto done;
2245 }
2246 err = -EADDRNOTAVAIL;
2247
2248 for_each_pmc_rtnl(inet, pmc) {
2249 if ((pmc->multi.imr_multiaddr.s_addr ==
2250 imr.imr_multiaddr.s_addr) &&
2251 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2252 break;
2253 }
2254 if (!pmc) { /* must have a prior join */
2255 err = -EINVAL;
2256 goto done;
2257 }
2258 /* if a source filter was set, must be the same mode as before */
2259 if (pmc->sflist) {
2260 if (pmc->sfmode != omode) {
2261 err = -EINVAL;
2262 goto done;
2263 }
2264 } else if (pmc->sfmode != omode) {
2265 /* allow mode switches for empty-set filters */
2266 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2267 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2268 NULL, 0);
2269 pmc->sfmode = omode;
2270 }
2271
2272 psl = rtnl_dereference(pmc->sflist);
2273 if (!add) {
2274 if (!psl)
2275 goto done; /* err = -EADDRNOTAVAIL */
2276 rv = !0;
2277 for (i = 0; i < psl->sl_count; i++) {
2278 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2279 sizeof(__be32));
2280 if (rv == 0)
2281 break;
2282 }
2283 if (rv) /* source not found */
2284 goto done; /* err = -EADDRNOTAVAIL */
2285
2286 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2287 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2288 leavegroup = 1;
2289 goto done;
2290 }
2291
2292 /* update the interface filter */
2293 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2294 &mreqs->imr_sourceaddr, 1);
2295
2296 for (j = i+1; j < psl->sl_count; j++)
2297 psl->sl_addr[j-1] = psl->sl_addr[j];
2298 psl->sl_count--;
2299 err = 0;
2300 goto done;
2301 }
2302 /* else, add a new source to the filter */
2303
2304 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2305 err = -ENOBUFS;
2306 goto done;
2307 }
2308 if (!psl || psl->sl_count == psl->sl_max) {
2309 struct ip_sf_socklist *newpsl;
2310 int count = IP_SFBLOCK;
2311
2312 if (psl)
2313 count += psl->sl_max;
2314 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2315 if (!newpsl) {
2316 err = -ENOBUFS;
2317 goto done;
2318 }
2319 newpsl->sl_max = count;
2320 newpsl->sl_count = count - IP_SFBLOCK;
2321 if (psl) {
2322 for (i = 0; i < psl->sl_count; i++)
2323 newpsl->sl_addr[i] = psl->sl_addr[i];
2324 /* decrease mem now to avoid the memleak warning */
2325 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2326 kfree_rcu(psl, rcu);
2327 }
2328 rcu_assign_pointer(pmc->sflist, newpsl);
2329 psl = newpsl;
2330 }
2331 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2332 for (i = 0; i < psl->sl_count; i++) {
2333 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2334 sizeof(__be32));
2335 if (rv == 0)
2336 break;
2337 }
2338 if (rv == 0) /* address already there is an error */
2339 goto done;
2340 for (j = psl->sl_count-1; j >= i; j--)
2341 psl->sl_addr[j+1] = psl->sl_addr[j];
2342 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2343 psl->sl_count++;
2344 err = 0;
2345 /* update the interface list */
2346 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2347 &mreqs->imr_sourceaddr, 1);
2348 done:
2349 if (leavegroup)
2350 err = ip_mc_leave_group(sk, &imr);
2351 return err;
2352 }
2353
2354 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2355 {
2356 int err = 0;
2357 struct ip_mreqn imr;
2358 __be32 addr = msf->imsf_multiaddr;
2359 struct ip_mc_socklist *pmc;
2360 struct in_device *in_dev;
2361 struct inet_sock *inet = inet_sk(sk);
2362 struct ip_sf_socklist *newpsl, *psl;
2363 struct net *net = sock_net(sk);
2364 int leavegroup = 0;
2365
2366 if (!ipv4_is_multicast(addr))
2367 return -EINVAL;
2368 if (msf->imsf_fmode != MCAST_INCLUDE &&
2369 msf->imsf_fmode != MCAST_EXCLUDE)
2370 return -EINVAL;
2371
2372 ASSERT_RTNL();
2373
2374 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2375 imr.imr_address.s_addr = msf->imsf_interface;
2376 imr.imr_ifindex = ifindex;
2377 in_dev = ip_mc_find_dev(net, &imr);
2378
2379 if (!in_dev) {
2380 err = -ENODEV;
2381 goto done;
2382 }
2383
2384 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2385 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2386 leavegroup = 1;
2387 goto done;
2388 }
2389
2390 for_each_pmc_rtnl(inet, pmc) {
2391 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2392 pmc->multi.imr_ifindex == imr.imr_ifindex)
2393 break;
2394 }
2395 if (!pmc) { /* must have a prior join */
2396 err = -EINVAL;
2397 goto done;
2398 }
2399 if (msf->imsf_numsrc) {
2400 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2401 GFP_KERNEL);
2402 if (!newpsl) {
2403 err = -ENOBUFS;
2404 goto done;
2405 }
2406 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2407 memcpy(newpsl->sl_addr, msf->imsf_slist,
2408 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2409 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2410 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2411 if (err) {
2412 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2413 goto done;
2414 }
2415 } else {
2416 newpsl = NULL;
2417 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2418 msf->imsf_fmode, 0, NULL, 0);
2419 }
2420 psl = rtnl_dereference(pmc->sflist);
2421 if (psl) {
2422 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2423 psl->sl_count, psl->sl_addr, 0);
2424 /* decrease mem now to avoid the memleak warning */
2425 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2426 kfree_rcu(psl, rcu);
2427 } else
2428 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2429 0, NULL, 0);
2430 rcu_assign_pointer(pmc->sflist, newpsl);
2431 pmc->sfmode = msf->imsf_fmode;
2432 err = 0;
2433 done:
2434 if (leavegroup)
2435 err = ip_mc_leave_group(sk, &imr);
2436 return err;
2437 }
2438
2439 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2440 struct ip_msfilter __user *optval, int __user *optlen)
2441 {
2442 int err, len, count, copycount;
2443 struct ip_mreqn imr;
2444 __be32 addr = msf->imsf_multiaddr;
2445 struct ip_mc_socklist *pmc;
2446 struct in_device *in_dev;
2447 struct inet_sock *inet = inet_sk(sk);
2448 struct ip_sf_socklist *psl;
2449 struct net *net = sock_net(sk);
2450
2451 ASSERT_RTNL();
2452
2453 if (!ipv4_is_multicast(addr))
2454 return -EINVAL;
2455
2456 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2457 imr.imr_address.s_addr = msf->imsf_interface;
2458 imr.imr_ifindex = 0;
2459 in_dev = ip_mc_find_dev(net, &imr);
2460
2461 if (!in_dev) {
2462 err = -ENODEV;
2463 goto done;
2464 }
2465 err = -EADDRNOTAVAIL;
2466
2467 for_each_pmc_rtnl(inet, pmc) {
2468 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2469 pmc->multi.imr_ifindex == imr.imr_ifindex)
2470 break;
2471 }
2472 if (!pmc) /* must have a prior join */
2473 goto done;
2474 msf->imsf_fmode = pmc->sfmode;
2475 psl = rtnl_dereference(pmc->sflist);
2476 if (!psl) {
2477 len = 0;
2478 count = 0;
2479 } else {
2480 count = psl->sl_count;
2481 }
2482 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2483 len = copycount * sizeof(psl->sl_addr[0]);
2484 msf->imsf_numsrc = count;
2485 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2486 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2487 return -EFAULT;
2488 }
2489 if (len &&
2490 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2491 return -EFAULT;
2492 return 0;
2493 done:
2494 return err;
2495 }
2496
2497 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2498 struct group_filter __user *optval, int __user *optlen)
2499 {
2500 int err, i, count, copycount;
2501 struct sockaddr_in *psin;
2502 __be32 addr;
2503 struct ip_mc_socklist *pmc;
2504 struct inet_sock *inet = inet_sk(sk);
2505 struct ip_sf_socklist *psl;
2506
2507 ASSERT_RTNL();
2508
2509 psin = (struct sockaddr_in *)&gsf->gf_group;
2510 if (psin->sin_family != AF_INET)
2511 return -EINVAL;
2512 addr = psin->sin_addr.s_addr;
2513 if (!ipv4_is_multicast(addr))
2514 return -EINVAL;
2515
2516 err = -EADDRNOTAVAIL;
2517
2518 for_each_pmc_rtnl(inet, pmc) {
2519 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2520 pmc->multi.imr_ifindex == gsf->gf_interface)
2521 break;
2522 }
2523 if (!pmc) /* must have a prior join */
2524 goto done;
2525 gsf->gf_fmode = pmc->sfmode;
2526 psl = rtnl_dereference(pmc->sflist);
2527 count = psl ? psl->sl_count : 0;
2528 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2529 gsf->gf_numsrc = count;
2530 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2531 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2532 return -EFAULT;
2533 }
2534 for (i = 0; i < copycount; i++) {
2535 struct sockaddr_storage ss;
2536
2537 psin = (struct sockaddr_in *)&ss;
2538 memset(&ss, 0, sizeof(ss));
2539 psin->sin_family = AF_INET;
2540 psin->sin_addr.s_addr = psl->sl_addr[i];
2541 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2542 return -EFAULT;
2543 }
2544 return 0;
2545 done:
2546 return err;
2547 }
2548
2549 /*
2550 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2551 */
2552 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2553 {
2554 struct inet_sock *inet = inet_sk(sk);
2555 struct ip_mc_socklist *pmc;
2556 struct ip_sf_socklist *psl;
2557 int i;
2558 int ret;
2559
2560 ret = 1;
2561 if (!ipv4_is_multicast(loc_addr))
2562 goto out;
2563
2564 rcu_read_lock();
2565 for_each_pmc_rcu(inet, pmc) {
2566 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2567 pmc->multi.imr_ifindex == dif)
2568 break;
2569 }
2570 ret = inet->mc_all;
2571 if (!pmc)
2572 goto unlock;
2573 psl = rcu_dereference(pmc->sflist);
2574 ret = (pmc->sfmode == MCAST_EXCLUDE);
2575 if (!psl)
2576 goto unlock;
2577
2578 for (i = 0; i < psl->sl_count; i++) {
2579 if (psl->sl_addr[i] == rmt_addr)
2580 break;
2581 }
2582 ret = 0;
2583 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2584 goto unlock;
2585 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2586 goto unlock;
2587 ret = 1;
2588 unlock:
2589 rcu_read_unlock();
2590 out:
2591 return ret;
2592 }
2593
2594 /*
2595 * A socket is closing.
2596 */
2597
2598 void ip_mc_drop_socket(struct sock *sk)
2599 {
2600 struct inet_sock *inet = inet_sk(sk);
2601 struct ip_mc_socklist *iml;
2602 struct net *net = sock_net(sk);
2603
2604 if (!inet->mc_list)
2605 return;
2606
2607 rtnl_lock();
2608 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2609 struct in_device *in_dev;
2610
2611 inet->mc_list = iml->next_rcu;
2612 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2613 (void) ip_mc_leave_src(sk, iml, in_dev);
2614 if (in_dev)
2615 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2616 /* decrease mem now to avoid the memleak warning */
2617 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2618 kfree_rcu(iml, rcu);
2619 }
2620 rtnl_unlock();
2621 }
2622
2623 /* called with rcu_read_lock() */
2624 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2625 {
2626 struct ip_mc_list *im;
2627 struct ip_mc_list __rcu **mc_hash;
2628 struct ip_sf_list *psf;
2629 int rv = 0;
2630
2631 mc_hash = rcu_dereference(in_dev->mc_hash);
2632 if (mc_hash) {
2633 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2634
2635 for (im = rcu_dereference(mc_hash[hash]);
2636 im != NULL;
2637 im = rcu_dereference(im->next_hash)) {
2638 if (im->multiaddr == mc_addr)
2639 break;
2640 }
2641 } else {
2642 for_each_pmc_rcu(in_dev, im) {
2643 if (im->multiaddr == mc_addr)
2644 break;
2645 }
2646 }
2647 if (im && proto == IPPROTO_IGMP) {
2648 rv = 1;
2649 } else if (im) {
2650 if (src_addr) {
2651 for (psf = im->sources; psf; psf = psf->sf_next) {
2652 if (psf->sf_inaddr == src_addr)
2653 break;
2654 }
2655 if (psf)
2656 rv = psf->sf_count[MCAST_INCLUDE] ||
2657 psf->sf_count[MCAST_EXCLUDE] !=
2658 im->sfcount[MCAST_EXCLUDE];
2659 else
2660 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2661 } else
2662 rv = 1; /* unspecified source; tentatively allow */
2663 }
2664 return rv;
2665 }
2666
2667 #if defined(CONFIG_PROC_FS)
2668 struct igmp_mc_iter_state {
2669 struct seq_net_private p;
2670 struct net_device *dev;
2671 struct in_device *in_dev;
2672 };
2673
2674 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2675
2676 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2677 {
2678 struct net *net = seq_file_net(seq);
2679 struct ip_mc_list *im = NULL;
2680 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2681
2682 state->in_dev = NULL;
2683 for_each_netdev_rcu(net, state->dev) {
2684 struct in_device *in_dev;
2685
2686 in_dev = __in_dev_get_rcu(state->dev);
2687 if (!in_dev)
2688 continue;
2689 im = rcu_dereference(in_dev->mc_list);
2690 if (im) {
2691 state->in_dev = in_dev;
2692 break;
2693 }
2694 }
2695 return im;
2696 }
2697
2698 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2699 {
2700 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2701
2702 im = rcu_dereference(im->next_rcu);
2703 while (!im) {
2704 state->dev = next_net_device_rcu(state->dev);
2705 if (!state->dev) {
2706 state->in_dev = NULL;
2707 break;
2708 }
2709 state->in_dev = __in_dev_get_rcu(state->dev);
2710 if (!state->in_dev)
2711 continue;
2712 im = rcu_dereference(state->in_dev->mc_list);
2713 }
2714 return im;
2715 }
2716
2717 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2718 {
2719 struct ip_mc_list *im = igmp_mc_get_first(seq);
2720 if (im)
2721 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2722 --pos;
2723 return pos ? NULL : im;
2724 }
2725
2726 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2727 __acquires(rcu)
2728 {
2729 rcu_read_lock();
2730 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2731 }
2732
2733 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2734 {
2735 struct ip_mc_list *im;
2736 if (v == SEQ_START_TOKEN)
2737 im = igmp_mc_get_first(seq);
2738 else
2739 im = igmp_mc_get_next(seq, v);
2740 ++*pos;
2741 return im;
2742 }
2743
2744 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2745 __releases(rcu)
2746 {
2747 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2748
2749 state->in_dev = NULL;
2750 state->dev = NULL;
2751 rcu_read_unlock();
2752 }
2753
2754 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2755 {
2756 if (v == SEQ_START_TOKEN)
2757 seq_puts(seq,
2758 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2759 else {
2760 struct ip_mc_list *im = (struct ip_mc_list *)v;
2761 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2762 char *querier;
2763 long delta;
2764
2765 #ifdef CONFIG_IP_MULTICAST
2766 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2767 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2768 "V3";
2769 #else
2770 querier = "NONE";
2771 #endif
2772
2773 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2774 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2775 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2776 }
2777
2778 delta = im->timer.expires - jiffies;
2779 seq_printf(seq,
2780 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2781 im->multiaddr, im->users,
2782 im->tm_running,
2783 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2784 im->reporter);
2785 }
2786 return 0;
2787 }
2788
2789 static const struct seq_operations igmp_mc_seq_ops = {
2790 .start = igmp_mc_seq_start,
2791 .next = igmp_mc_seq_next,
2792 .stop = igmp_mc_seq_stop,
2793 .show = igmp_mc_seq_show,
2794 };
2795
2796 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2797 {
2798 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2799 sizeof(struct igmp_mc_iter_state));
2800 }
2801
2802 static const struct file_operations igmp_mc_seq_fops = {
2803 .owner = THIS_MODULE,
2804 .open = igmp_mc_seq_open,
2805 .read = seq_read,
2806 .llseek = seq_lseek,
2807 .release = seq_release_net,
2808 };
2809
2810 struct igmp_mcf_iter_state {
2811 struct seq_net_private p;
2812 struct net_device *dev;
2813 struct in_device *idev;
2814 struct ip_mc_list *im;
2815 };
2816
2817 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2818
2819 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2820 {
2821 struct net *net = seq_file_net(seq);
2822 struct ip_sf_list *psf = NULL;
2823 struct ip_mc_list *im = NULL;
2824 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2825
2826 state->idev = NULL;
2827 state->im = NULL;
2828 for_each_netdev_rcu(net, state->dev) {
2829 struct in_device *idev;
2830 idev = __in_dev_get_rcu(state->dev);
2831 if (unlikely(!idev))
2832 continue;
2833 im = rcu_dereference(idev->mc_list);
2834 if (likely(im)) {
2835 spin_lock_bh(&im->lock);
2836 psf = im->sources;
2837 if (likely(psf)) {
2838 state->im = im;
2839 state->idev = idev;
2840 break;
2841 }
2842 spin_unlock_bh(&im->lock);
2843 }
2844 }
2845 return psf;
2846 }
2847
2848 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2849 {
2850 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2851
2852 psf = psf->sf_next;
2853 while (!psf) {
2854 spin_unlock_bh(&state->im->lock);
2855 state->im = state->im->next;
2856 while (!state->im) {
2857 state->dev = next_net_device_rcu(state->dev);
2858 if (!state->dev) {
2859 state->idev = NULL;
2860 goto out;
2861 }
2862 state->idev = __in_dev_get_rcu(state->dev);
2863 if (!state->idev)
2864 continue;
2865 state->im = rcu_dereference(state->idev->mc_list);
2866 }
2867 if (!state->im)
2868 break;
2869 spin_lock_bh(&state->im->lock);
2870 psf = state->im->sources;
2871 }
2872 out:
2873 return psf;
2874 }
2875
2876 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2877 {
2878 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2879 if (psf)
2880 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2881 --pos;
2882 return pos ? NULL : psf;
2883 }
2884
2885 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2886 __acquires(rcu)
2887 {
2888 rcu_read_lock();
2889 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2890 }
2891
2892 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2893 {
2894 struct ip_sf_list *psf;
2895 if (v == SEQ_START_TOKEN)
2896 psf = igmp_mcf_get_first(seq);
2897 else
2898 psf = igmp_mcf_get_next(seq, v);
2899 ++*pos;
2900 return psf;
2901 }
2902
2903 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2904 __releases(rcu)
2905 {
2906 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2907 if (likely(state->im)) {
2908 spin_unlock_bh(&state->im->lock);
2909 state->im = NULL;
2910 }
2911 state->idev = NULL;
2912 state->dev = NULL;
2913 rcu_read_unlock();
2914 }
2915
2916 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2917 {
2918 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2919 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2920
2921 if (v == SEQ_START_TOKEN) {
2922 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2923 } else {
2924 seq_printf(seq,
2925 "%3d %6.6s 0x%08x "
2926 "0x%08x %6lu %6lu\n",
2927 state->dev->ifindex, state->dev->name,
2928 ntohl(state->im->multiaddr),
2929 ntohl(psf->sf_inaddr),
2930 psf->sf_count[MCAST_INCLUDE],
2931 psf->sf_count[MCAST_EXCLUDE]);
2932 }
2933 return 0;
2934 }
2935
2936 static const struct seq_operations igmp_mcf_seq_ops = {
2937 .start = igmp_mcf_seq_start,
2938 .next = igmp_mcf_seq_next,
2939 .stop = igmp_mcf_seq_stop,
2940 .show = igmp_mcf_seq_show,
2941 };
2942
2943 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2944 {
2945 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2946 sizeof(struct igmp_mcf_iter_state));
2947 }
2948
2949 static const struct file_operations igmp_mcf_seq_fops = {
2950 .owner = THIS_MODULE,
2951 .open = igmp_mcf_seq_open,
2952 .read = seq_read,
2953 .llseek = seq_lseek,
2954 .release = seq_release_net,
2955 };
2956
2957 static int __net_init igmp_net_init(struct net *net)
2958 {
2959 struct proc_dir_entry *pde;
2960 int err;
2961
2962 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2963 if (!pde)
2964 goto out_igmp;
2965 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2966 &igmp_mcf_seq_fops);
2967 if (!pde)
2968 goto out_mcfilter;
2969 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2970 SOCK_DGRAM, 0, net);
2971 if (err < 0) {
2972 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2973 err);
2974 goto out_sock;
2975 }
2976
2977 /* Sysctl initialization */
2978 net->ipv4.sysctl_igmp_max_memberships = 20;
2979 net->ipv4.sysctl_igmp_max_msf = 10;
2980 /* IGMP reports for link-local multicast groups are enabled by default */
2981 net->ipv4.sysctl_igmp_llm_reports = 1;
2982 net->ipv4.sysctl_igmp_qrv = 2;
2983 return 0;
2984
2985 out_sock:
2986 remove_proc_entry("mcfilter", net->proc_net);
2987 out_mcfilter:
2988 remove_proc_entry("igmp", net->proc_net);
2989 out_igmp:
2990 return -ENOMEM;
2991 }
2992
2993 static void __net_exit igmp_net_exit(struct net *net)
2994 {
2995 remove_proc_entry("mcfilter", net->proc_net);
2996 remove_proc_entry("igmp", net->proc_net);
2997 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2998 }
2999
3000 static struct pernet_operations igmp_net_ops = {
3001 .init = igmp_net_init,
3002 .exit = igmp_net_exit,
3003 };
3004 #endif
3005
3006 static int igmp_netdev_event(struct notifier_block *this,
3007 unsigned long event, void *ptr)
3008 {
3009 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3010 struct in_device *in_dev;
3011
3012 switch (event) {
3013 case NETDEV_RESEND_IGMP:
3014 in_dev = __in_dev_get_rtnl(dev);
3015 if (in_dev)
3016 ip_mc_rejoin_groups(in_dev);
3017 break;
3018 default:
3019 break;
3020 }
3021 return NOTIFY_DONE;
3022 }
3023
3024 static struct notifier_block igmp_notifier = {
3025 .notifier_call = igmp_netdev_event,
3026 };
3027
3028 int __init igmp_mc_init(void)
3029 {
3030 #if defined(CONFIG_PROC_FS)
3031 int err;
3032
3033 err = register_pernet_subsys(&igmp_net_ops);
3034 if (err)
3035 return err;
3036 err = register_netdevice_notifier(&igmp_notifier);
3037 if (err)
3038 goto reg_notif_fail;
3039 return 0;
3040
3041 reg_notif_fail:
3042 unregister_pernet_subsys(&igmp_net_ops);
3043 return err;
3044 #else
3045 return register_netdevice_notifier(&igmp_notifier);
3046 #endif
3047 }
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