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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
223 in_dev->mr_gq_running = 1;
224 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
225 in_dev_hold(in_dev);
226 }
227
228 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
229 {
230 int tv = prandom_u32() % delay;
231
232 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
233 in_dev_hold(in_dev);
234 }
235
236 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
237 {
238 spin_lock_bh(&im->lock);
239 im->unsolicit_count = 0;
240 if (del_timer(&im->timer)) {
241 if ((long)(im->timer.expires-jiffies) < max_delay) {
242 add_timer(&im->timer);
243 im->tm_running = 1;
244 spin_unlock_bh(&im->lock);
245 return;
246 }
247 atomic_dec(&im->refcnt);
248 }
249 igmp_start_timer(im, max_delay);
250 spin_unlock_bh(&im->lock);
251 }
252
253
254 /*
255 * Send an IGMP report.
256 */
257
258 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
259
260
261 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
262 int gdeleted, int sdeleted)
263 {
264 switch (type) {
265 case IGMPV3_MODE_IS_INCLUDE:
266 case IGMPV3_MODE_IS_EXCLUDE:
267 if (gdeleted || sdeleted)
268 return 0;
269 if (!(pmc->gsquery && !psf->sf_gsresp)) {
270 if (pmc->sfmode == MCAST_INCLUDE)
271 return 1;
272 /* don't include if this source is excluded
273 * in all filters
274 */
275 if (psf->sf_count[MCAST_INCLUDE])
276 return type == IGMPV3_MODE_IS_INCLUDE;
277 return pmc->sfcount[MCAST_EXCLUDE] ==
278 psf->sf_count[MCAST_EXCLUDE];
279 }
280 return 0;
281 case IGMPV3_CHANGE_TO_INCLUDE:
282 if (gdeleted || sdeleted)
283 return 0;
284 return psf->sf_count[MCAST_INCLUDE] != 0;
285 case IGMPV3_CHANGE_TO_EXCLUDE:
286 if (gdeleted || sdeleted)
287 return 0;
288 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
289 psf->sf_count[MCAST_INCLUDE])
290 return 0;
291 return pmc->sfcount[MCAST_EXCLUDE] ==
292 psf->sf_count[MCAST_EXCLUDE];
293 case IGMPV3_ALLOW_NEW_SOURCES:
294 if (gdeleted || !psf->sf_crcount)
295 return 0;
296 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
297 case IGMPV3_BLOCK_OLD_SOURCES:
298 if (pmc->sfmode == MCAST_INCLUDE)
299 return gdeleted || (psf->sf_crcount && sdeleted);
300 return psf->sf_crcount && !gdeleted && !sdeleted;
301 }
302 return 0;
303 }
304
305 static int
306 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
307 {
308 struct ip_sf_list *psf;
309 int scount = 0;
310
311 for (psf = pmc->sources; psf; psf = psf->sf_next) {
312 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
313 continue;
314 scount++;
315 }
316 return scount;
317 }
318
319 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
320 {
321 struct sk_buff *skb;
322 struct rtable *rt;
323 struct iphdr *pip;
324 struct igmpv3_report *pig;
325 struct net *net = dev_net(dev);
326 struct flowi4 fl4;
327 int hlen = LL_RESERVED_SPACE(dev);
328 int tlen = dev->needed_tailroom;
329 unsigned int size = mtu;
330
331 while (1) {
332 skb = alloc_skb(size + hlen + tlen,
333 GFP_ATOMIC | __GFP_NOWARN);
334 if (skb)
335 break;
336 size >>= 1;
337 if (size < 256)
338 return NULL;
339 }
340 skb->priority = TC_PRIO_CONTROL;
341
342 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
343 0, 0,
344 IPPROTO_IGMP, 0, dev->ifindex);
345 if (IS_ERR(rt)) {
346 kfree_skb(skb);
347 return NULL;
348 }
349
350 skb_dst_set(skb, &rt->dst);
351 skb->dev = dev;
352
353 skb_reserve(skb, hlen);
354 skb_tailroom_reserve(skb, mtu, tlen);
355
356 skb_reset_network_header(skb);
357 pip = ip_hdr(skb);
358 skb_put(skb, sizeof(struct iphdr) + 4);
359
360 pip->version = 4;
361 pip->ihl = (sizeof(struct iphdr)+4)>>2;
362 pip->tos = 0xc0;
363 pip->frag_off = htons(IP_DF);
364 pip->ttl = 1;
365 pip->daddr = fl4.daddr;
366 pip->saddr = fl4.saddr;
367 pip->protocol = IPPROTO_IGMP;
368 pip->tot_len = 0; /* filled in later */
369 ip_select_ident(net, skb, NULL);
370 ((u8 *)&pip[1])[0] = IPOPT_RA;
371 ((u8 *)&pip[1])[1] = 4;
372 ((u8 *)&pip[1])[2] = 0;
373 ((u8 *)&pip[1])[3] = 0;
374
375 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
376 skb_put(skb, sizeof(*pig));
377 pig = igmpv3_report_hdr(skb);
378 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
379 pig->resv1 = 0;
380 pig->csum = 0;
381 pig->resv2 = 0;
382 pig->ngrec = 0;
383 return skb;
384 }
385
386 static int igmpv3_sendpack(struct sk_buff *skb)
387 {
388 struct igmphdr *pig = igmp_hdr(skb);
389 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
390
391 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
392
393 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
394 }
395
396 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
397 {
398 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
399 }
400
401 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
402 int type, struct igmpv3_grec **ppgr)
403 {
404 struct net_device *dev = pmc->interface->dev;
405 struct igmpv3_report *pih;
406 struct igmpv3_grec *pgr;
407
408 if (!skb)
409 skb = igmpv3_newpack(dev, dev->mtu);
410 if (!skb)
411 return NULL;
412 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
413 pgr->grec_type = type;
414 pgr->grec_auxwords = 0;
415 pgr->grec_nsrcs = 0;
416 pgr->grec_mca = pmc->multiaddr;
417 pih = igmpv3_report_hdr(skb);
418 pih->ngrec = htons(ntohs(pih->ngrec)+1);
419 *ppgr = pgr;
420 return skb;
421 }
422
423 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
424
425 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
426 int type, int gdeleted, int sdeleted)
427 {
428 struct net_device *dev = pmc->interface->dev;
429 struct net *net = dev_net(dev);
430 struct igmpv3_report *pih;
431 struct igmpv3_grec *pgr = NULL;
432 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
433 int scount, stotal, first, isquery, truncate;
434
435 if (pmc->multiaddr == IGMP_ALL_HOSTS)
436 return skb;
437 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
438 return skb;
439
440 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
441 type == IGMPV3_MODE_IS_EXCLUDE;
442 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
443 type == IGMPV3_CHANGE_TO_EXCLUDE;
444
445 stotal = scount = 0;
446
447 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
448
449 if (!*psf_list)
450 goto empty_source;
451
452 pih = skb ? igmpv3_report_hdr(skb) : NULL;
453
454 /* EX and TO_EX get a fresh packet, if needed */
455 if (truncate) {
456 if (pih && pih->ngrec &&
457 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
458 if (skb)
459 igmpv3_sendpack(skb);
460 skb = igmpv3_newpack(dev, dev->mtu);
461 }
462 }
463 first = 1;
464 psf_prev = NULL;
465 for (psf = *psf_list; psf; psf = psf_next) {
466 __be32 *psrc;
467
468 psf_next = psf->sf_next;
469
470 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
471 psf_prev = psf;
472 continue;
473 }
474
475 /* Based on RFC3376 5.1. Should not send source-list change
476 * records when there is a filter mode change.
477 */
478 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
479 (!gdeleted && pmc->crcount)) &&
480 (type == IGMPV3_ALLOW_NEW_SOURCES ||
481 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
482 goto decrease_sf_crcount;
483
484 /* clear marks on query responses */
485 if (isquery)
486 psf->sf_gsresp = 0;
487
488 if (AVAILABLE(skb) < sizeof(__be32) +
489 first*sizeof(struct igmpv3_grec)) {
490 if (truncate && !first)
491 break; /* truncate these */
492 if (pgr)
493 pgr->grec_nsrcs = htons(scount);
494 if (skb)
495 igmpv3_sendpack(skb);
496 skb = igmpv3_newpack(dev, dev->mtu);
497 first = 1;
498 scount = 0;
499 }
500 if (first) {
501 skb = add_grhead(skb, pmc, type, &pgr);
502 first = 0;
503 }
504 if (!skb)
505 return NULL;
506 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
507 *psrc = psf->sf_inaddr;
508 scount++; stotal++;
509 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
510 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
511 decrease_sf_crcount:
512 psf->sf_crcount--;
513 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
514 if (psf_prev)
515 psf_prev->sf_next = psf->sf_next;
516 else
517 *psf_list = psf->sf_next;
518 kfree(psf);
519 continue;
520 }
521 }
522 psf_prev = psf;
523 }
524
525 empty_source:
526 if (!stotal) {
527 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
528 type == IGMPV3_BLOCK_OLD_SOURCES)
529 return skb;
530 if (pmc->crcount || isquery) {
531 /* make sure we have room for group header */
532 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
533 igmpv3_sendpack(skb);
534 skb = NULL; /* add_grhead will get a new one */
535 }
536 skb = add_grhead(skb, pmc, type, &pgr);
537 }
538 }
539 if (pgr)
540 pgr->grec_nsrcs = htons(scount);
541
542 if (isquery)
543 pmc->gsquery = 0; /* clear query state on report */
544 return skb;
545 }
546
547 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
548 {
549 struct sk_buff *skb = NULL;
550 struct net *net = dev_net(in_dev->dev);
551 int type;
552
553 if (!pmc) {
554 rcu_read_lock();
555 for_each_pmc_rcu(in_dev, pmc) {
556 if (pmc->multiaddr == IGMP_ALL_HOSTS)
557 continue;
558 if (ipv4_is_local_multicast(pmc->multiaddr) &&
559 !net->ipv4.sysctl_igmp_llm_reports)
560 continue;
561 spin_lock_bh(&pmc->lock);
562 if (pmc->sfcount[MCAST_EXCLUDE])
563 type = IGMPV3_MODE_IS_EXCLUDE;
564 else
565 type = IGMPV3_MODE_IS_INCLUDE;
566 skb = add_grec(skb, pmc, type, 0, 0);
567 spin_unlock_bh(&pmc->lock);
568 }
569 rcu_read_unlock();
570 } else {
571 spin_lock_bh(&pmc->lock);
572 if (pmc->sfcount[MCAST_EXCLUDE])
573 type = IGMPV3_MODE_IS_EXCLUDE;
574 else
575 type = IGMPV3_MODE_IS_INCLUDE;
576 skb = add_grec(skb, pmc, type, 0, 0);
577 spin_unlock_bh(&pmc->lock);
578 }
579 if (!skb)
580 return 0;
581 return igmpv3_sendpack(skb);
582 }
583
584 /*
585 * remove zero-count source records from a source filter list
586 */
587 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
588 {
589 struct ip_sf_list *psf_prev, *psf_next, *psf;
590
591 psf_prev = NULL;
592 for (psf = *ppsf; psf; psf = psf_next) {
593 psf_next = psf->sf_next;
594 if (psf->sf_crcount == 0) {
595 if (psf_prev)
596 psf_prev->sf_next = psf->sf_next;
597 else
598 *ppsf = psf->sf_next;
599 kfree(psf);
600 } else
601 psf_prev = psf;
602 }
603 }
604
605 static void igmpv3_send_cr(struct in_device *in_dev)
606 {
607 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
608 struct sk_buff *skb = NULL;
609 int type, dtype;
610
611 rcu_read_lock();
612 spin_lock_bh(&in_dev->mc_tomb_lock);
613
614 /* deleted MCA's */
615 pmc_prev = NULL;
616 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
617 pmc_next = pmc->next;
618 if (pmc->sfmode == MCAST_INCLUDE) {
619 type = IGMPV3_BLOCK_OLD_SOURCES;
620 dtype = IGMPV3_BLOCK_OLD_SOURCES;
621 skb = add_grec(skb, pmc, type, 1, 0);
622 skb = add_grec(skb, pmc, dtype, 1, 1);
623 }
624 if (pmc->crcount) {
625 if (pmc->sfmode == MCAST_EXCLUDE) {
626 type = IGMPV3_CHANGE_TO_INCLUDE;
627 skb = add_grec(skb, pmc, type, 1, 0);
628 }
629 pmc->crcount--;
630 if (pmc->crcount == 0) {
631 igmpv3_clear_zeros(&pmc->tomb);
632 igmpv3_clear_zeros(&pmc->sources);
633 }
634 }
635 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
636 if (pmc_prev)
637 pmc_prev->next = pmc_next;
638 else
639 in_dev->mc_tomb = pmc_next;
640 in_dev_put(pmc->interface);
641 kfree(pmc);
642 } else
643 pmc_prev = pmc;
644 }
645 spin_unlock_bh(&in_dev->mc_tomb_lock);
646
647 /* change recs */
648 for_each_pmc_rcu(in_dev, pmc) {
649 spin_lock_bh(&pmc->lock);
650 if (pmc->sfcount[MCAST_EXCLUDE]) {
651 type = IGMPV3_BLOCK_OLD_SOURCES;
652 dtype = IGMPV3_ALLOW_NEW_SOURCES;
653 } else {
654 type = IGMPV3_ALLOW_NEW_SOURCES;
655 dtype = IGMPV3_BLOCK_OLD_SOURCES;
656 }
657 skb = add_grec(skb, pmc, type, 0, 0);
658 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
659
660 /* filter mode changes */
661 if (pmc->crcount) {
662 if (pmc->sfmode == MCAST_EXCLUDE)
663 type = IGMPV3_CHANGE_TO_EXCLUDE;
664 else
665 type = IGMPV3_CHANGE_TO_INCLUDE;
666 skb = add_grec(skb, pmc, type, 0, 0);
667 pmc->crcount--;
668 }
669 spin_unlock_bh(&pmc->lock);
670 }
671 rcu_read_unlock();
672
673 if (!skb)
674 return;
675 (void) igmpv3_sendpack(skb);
676 }
677
678 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
679 int type)
680 {
681 struct sk_buff *skb;
682 struct iphdr *iph;
683 struct igmphdr *ih;
684 struct rtable *rt;
685 struct net_device *dev = in_dev->dev;
686 struct net *net = dev_net(dev);
687 __be32 group = pmc ? pmc->multiaddr : 0;
688 struct flowi4 fl4;
689 __be32 dst;
690 int hlen, tlen;
691
692 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
693 return igmpv3_send_report(in_dev, pmc);
694
695 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
696 return 0;
697
698 if (type == IGMP_HOST_LEAVE_MESSAGE)
699 dst = IGMP_ALL_ROUTER;
700 else
701 dst = group;
702
703 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
704 0, 0,
705 IPPROTO_IGMP, 0, dev->ifindex);
706 if (IS_ERR(rt))
707 return -1;
708
709 hlen = LL_RESERVED_SPACE(dev);
710 tlen = dev->needed_tailroom;
711 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
712 if (!skb) {
713 ip_rt_put(rt);
714 return -1;
715 }
716 skb->priority = TC_PRIO_CONTROL;
717
718 skb_dst_set(skb, &rt->dst);
719
720 skb_reserve(skb, hlen);
721
722 skb_reset_network_header(skb);
723 iph = ip_hdr(skb);
724 skb_put(skb, sizeof(struct iphdr) + 4);
725
726 iph->version = 4;
727 iph->ihl = (sizeof(struct iphdr)+4)>>2;
728 iph->tos = 0xc0;
729 iph->frag_off = htons(IP_DF);
730 iph->ttl = 1;
731 iph->daddr = dst;
732 iph->saddr = fl4.saddr;
733 iph->protocol = IPPROTO_IGMP;
734 ip_select_ident(net, skb, NULL);
735 ((u8 *)&iph[1])[0] = IPOPT_RA;
736 ((u8 *)&iph[1])[1] = 4;
737 ((u8 *)&iph[1])[2] = 0;
738 ((u8 *)&iph[1])[3] = 0;
739
740 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
741 ih->type = type;
742 ih->code = 0;
743 ih->csum = 0;
744 ih->group = group;
745 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
746
747 return ip_local_out(net, skb->sk, skb);
748 }
749
750 static void igmp_gq_timer_expire(unsigned long data)
751 {
752 struct in_device *in_dev = (struct in_device *)data;
753
754 in_dev->mr_gq_running = 0;
755 igmpv3_send_report(in_dev, NULL);
756 in_dev_put(in_dev);
757 }
758
759 static void igmp_ifc_timer_expire(unsigned long data)
760 {
761 struct in_device *in_dev = (struct in_device *)data;
762
763 igmpv3_send_cr(in_dev);
764 if (in_dev->mr_ifc_count) {
765 in_dev->mr_ifc_count--;
766 igmp_ifc_start_timer(in_dev,
767 unsolicited_report_interval(in_dev));
768 }
769 in_dev_put(in_dev);
770 }
771
772 static void igmp_ifc_event(struct in_device *in_dev)
773 {
774 struct net *net = dev_net(in_dev->dev);
775 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
776 return;
777 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
778 igmp_ifc_start_timer(in_dev, 1);
779 }
780
781
782 static void igmp_timer_expire(unsigned long data)
783 {
784 struct ip_mc_list *im = (struct ip_mc_list *)data;
785 struct in_device *in_dev = im->interface;
786
787 spin_lock(&im->lock);
788 im->tm_running = 0;
789
790 if (im->unsolicit_count) {
791 im->unsolicit_count--;
792 igmp_start_timer(im, unsolicited_report_interval(in_dev));
793 }
794 im->reporter = 1;
795 spin_unlock(&im->lock);
796
797 if (IGMP_V1_SEEN(in_dev))
798 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
799 else if (IGMP_V2_SEEN(in_dev))
800 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
801 else
802 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
803
804 ip_ma_put(im);
805 }
806
807 /* mark EXCLUDE-mode sources */
808 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
809 {
810 struct ip_sf_list *psf;
811 int i, scount;
812
813 scount = 0;
814 for (psf = pmc->sources; psf; psf = psf->sf_next) {
815 if (scount == nsrcs)
816 break;
817 for (i = 0; i < nsrcs; i++) {
818 /* skip inactive filters */
819 if (psf->sf_count[MCAST_INCLUDE] ||
820 pmc->sfcount[MCAST_EXCLUDE] !=
821 psf->sf_count[MCAST_EXCLUDE])
822 break;
823 if (srcs[i] == psf->sf_inaddr) {
824 scount++;
825 break;
826 }
827 }
828 }
829 pmc->gsquery = 0;
830 if (scount == nsrcs) /* all sources excluded */
831 return 0;
832 return 1;
833 }
834
835 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
836 {
837 struct ip_sf_list *psf;
838 int i, scount;
839
840 if (pmc->sfmode == MCAST_EXCLUDE)
841 return igmp_xmarksources(pmc, nsrcs, srcs);
842
843 /* mark INCLUDE-mode sources */
844 scount = 0;
845 for (psf = pmc->sources; psf; psf = psf->sf_next) {
846 if (scount == nsrcs)
847 break;
848 for (i = 0; i < nsrcs; i++)
849 if (srcs[i] == psf->sf_inaddr) {
850 psf->sf_gsresp = 1;
851 scount++;
852 break;
853 }
854 }
855 if (!scount) {
856 pmc->gsquery = 0;
857 return 0;
858 }
859 pmc->gsquery = 1;
860 return 1;
861 }
862
863 /* return true if packet was dropped */
864 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
865 {
866 struct ip_mc_list *im;
867 struct net *net = dev_net(in_dev->dev);
868
869 /* Timers are only set for non-local groups */
870
871 if (group == IGMP_ALL_HOSTS)
872 return false;
873 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
874 return false;
875
876 rcu_read_lock();
877 for_each_pmc_rcu(in_dev, im) {
878 if (im->multiaddr == group) {
879 igmp_stop_timer(im);
880 break;
881 }
882 }
883 rcu_read_unlock();
884 return false;
885 }
886
887 /* return true if packet was dropped */
888 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
889 int len)
890 {
891 struct igmphdr *ih = igmp_hdr(skb);
892 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
893 struct ip_mc_list *im;
894 __be32 group = ih->group;
895 int max_delay;
896 int mark = 0;
897 struct net *net = dev_net(in_dev->dev);
898
899
900 if (len == 8) {
901 if (ih->code == 0) {
902 /* Alas, old v1 router presents here. */
903
904 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
905 in_dev->mr_v1_seen = jiffies +
906 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
907 group = 0;
908 } else {
909 /* v2 router present */
910 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
911 in_dev->mr_v2_seen = jiffies +
912 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
913 }
914 /* cancel the interface change timer */
915 in_dev->mr_ifc_count = 0;
916 if (del_timer(&in_dev->mr_ifc_timer))
917 __in_dev_put(in_dev);
918 /* clear deleted report items */
919 igmpv3_clear_delrec(in_dev);
920 } else if (len < 12) {
921 return true; /* ignore bogus packet; freed by caller */
922 } else if (IGMP_V1_SEEN(in_dev)) {
923 /* This is a v3 query with v1 queriers present */
924 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
925 group = 0;
926 } else if (IGMP_V2_SEEN(in_dev)) {
927 /* this is a v3 query with v2 queriers present;
928 * Interpretation of the max_delay code is problematic here.
929 * A real v2 host would use ih_code directly, while v3 has a
930 * different encoding. We use the v3 encoding as more likely
931 * to be intended in a v3 query.
932 */
933 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
934 if (!max_delay)
935 max_delay = 1; /* can't mod w/ 0 */
936 } else { /* v3 */
937 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
938 return true;
939
940 ih3 = igmpv3_query_hdr(skb);
941 if (ih3->nsrcs) {
942 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
943 + ntohs(ih3->nsrcs)*sizeof(__be32)))
944 return true;
945 ih3 = igmpv3_query_hdr(skb);
946 }
947
948 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
949 if (!max_delay)
950 max_delay = 1; /* can't mod w/ 0 */
951 in_dev->mr_maxdelay = max_delay;
952 if (ih3->qrv)
953 in_dev->mr_qrv = ih3->qrv;
954 if (!group) { /* general query */
955 if (ih3->nsrcs)
956 return true; /* no sources allowed */
957 igmp_gq_start_timer(in_dev);
958 return false;
959 }
960 /* mark sources to include, if group & source-specific */
961 mark = ih3->nsrcs != 0;
962 }
963
964 /*
965 * - Start the timers in all of our membership records
966 * that the query applies to for the interface on
967 * which the query arrived excl. those that belong
968 * to a "local" group (224.0.0.X)
969 * - For timers already running check if they need to
970 * be reset.
971 * - Use the igmp->igmp_code field as the maximum
972 * delay possible
973 */
974 rcu_read_lock();
975 for_each_pmc_rcu(in_dev, im) {
976 int changed;
977
978 if (group && group != im->multiaddr)
979 continue;
980 if (im->multiaddr == IGMP_ALL_HOSTS)
981 continue;
982 if (ipv4_is_local_multicast(im->multiaddr) &&
983 !net->ipv4.sysctl_igmp_llm_reports)
984 continue;
985 spin_lock_bh(&im->lock);
986 if (im->tm_running)
987 im->gsquery = im->gsquery && mark;
988 else
989 im->gsquery = mark;
990 changed = !im->gsquery ||
991 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
992 spin_unlock_bh(&im->lock);
993 if (changed)
994 igmp_mod_timer(im, max_delay);
995 }
996 rcu_read_unlock();
997 return false;
998 }
999
1000 /* called in rcu_read_lock() section */
1001 int igmp_rcv(struct sk_buff *skb)
1002 {
1003 /* This basically follows the spec line by line -- see RFC1112 */
1004 struct igmphdr *ih;
1005 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1006 int len = skb->len;
1007 bool dropped = true;
1008
1009 if (!in_dev)
1010 goto drop;
1011
1012 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1013 goto drop;
1014
1015 if (skb_checksum_simple_validate(skb))
1016 goto drop;
1017
1018 ih = igmp_hdr(skb);
1019 switch (ih->type) {
1020 case IGMP_HOST_MEMBERSHIP_QUERY:
1021 dropped = igmp_heard_query(in_dev, skb, len);
1022 break;
1023 case IGMP_HOST_MEMBERSHIP_REPORT:
1024 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1025 /* Is it our report looped back? */
1026 if (rt_is_output_route(skb_rtable(skb)))
1027 break;
1028 /* don't rely on MC router hearing unicast reports */
1029 if (skb->pkt_type == PACKET_MULTICAST ||
1030 skb->pkt_type == PACKET_BROADCAST)
1031 dropped = igmp_heard_report(in_dev, ih->group);
1032 break;
1033 case IGMP_PIM:
1034 #ifdef CONFIG_IP_PIMSM_V1
1035 return pim_rcv_v1(skb);
1036 #endif
1037 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1038 case IGMP_DVMRP:
1039 case IGMP_TRACE:
1040 case IGMP_HOST_LEAVE_MESSAGE:
1041 case IGMP_MTRACE:
1042 case IGMP_MTRACE_RESP:
1043 break;
1044 default:
1045 break;
1046 }
1047
1048 drop:
1049 if (dropped)
1050 kfree_skb(skb);
1051 else
1052 consume_skb(skb);
1053 return 0;
1054 }
1055
1056 #endif
1057
1058
1059 /*
1060 * Add a filter to a device
1061 */
1062
1063 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1064 {
1065 char buf[MAX_ADDR_LEN];
1066 struct net_device *dev = in_dev->dev;
1067
1068 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1069 We will get multicast token leakage, when IFF_MULTICAST
1070 is changed. This check should be done in ndo_set_rx_mode
1071 routine. Something sort of:
1072 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1073 --ANK
1074 */
1075 if (arp_mc_map(addr, buf, dev, 0) == 0)
1076 dev_mc_add(dev, buf);
1077 }
1078
1079 /*
1080 * Remove a filter from a device
1081 */
1082
1083 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1084 {
1085 char buf[MAX_ADDR_LEN];
1086 struct net_device *dev = in_dev->dev;
1087
1088 if (arp_mc_map(addr, buf, dev, 0) == 0)
1089 dev_mc_del(dev, buf);
1090 }
1091
1092 #ifdef CONFIG_IP_MULTICAST
1093 /*
1094 * deleted ip_mc_list manipulation
1095 */
1096 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1097 {
1098 struct ip_mc_list *pmc;
1099 struct net *net = dev_net(in_dev->dev);
1100
1101 /* this is an "ip_mc_list" for convenience; only the fields below
1102 * are actually used. In particular, the refcnt and users are not
1103 * used for management of the delete list. Using the same structure
1104 * for deleted items allows change reports to use common code with
1105 * non-deleted or query-response MCA's.
1106 */
1107 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1108 if (!pmc)
1109 return;
1110 spin_lock_bh(&im->lock);
1111 pmc->interface = im->interface;
1112 in_dev_hold(in_dev);
1113 pmc->multiaddr = im->multiaddr;
1114 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1115 pmc->sfmode = im->sfmode;
1116 if (pmc->sfmode == MCAST_INCLUDE) {
1117 struct ip_sf_list *psf;
1118
1119 pmc->tomb = im->tomb;
1120 pmc->sources = im->sources;
1121 im->tomb = im->sources = NULL;
1122 for (psf = pmc->sources; psf; psf = psf->sf_next)
1123 psf->sf_crcount = pmc->crcount;
1124 }
1125 spin_unlock_bh(&im->lock);
1126
1127 spin_lock_bh(&in_dev->mc_tomb_lock);
1128 pmc->next = in_dev->mc_tomb;
1129 in_dev->mc_tomb = pmc;
1130 spin_unlock_bh(&in_dev->mc_tomb_lock);
1131 }
1132
1133 /*
1134 * restore ip_mc_list deleted records
1135 */
1136 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1137 {
1138 struct ip_mc_list *pmc, *pmc_prev;
1139 struct ip_sf_list *psf;
1140 struct net *net = dev_net(in_dev->dev);
1141 __be32 multiaddr = im->multiaddr;
1142
1143 spin_lock_bh(&in_dev->mc_tomb_lock);
1144 pmc_prev = NULL;
1145 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1146 if (pmc->multiaddr == multiaddr)
1147 break;
1148 pmc_prev = pmc;
1149 }
1150 if (pmc) {
1151 if (pmc_prev)
1152 pmc_prev->next = pmc->next;
1153 else
1154 in_dev->mc_tomb = pmc->next;
1155 }
1156 spin_unlock_bh(&in_dev->mc_tomb_lock);
1157
1158 spin_lock_bh(&im->lock);
1159 if (pmc) {
1160 im->interface = pmc->interface;
1161 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1162 im->sfmode = pmc->sfmode;
1163 if (pmc->sfmode == MCAST_INCLUDE) {
1164 im->tomb = pmc->tomb;
1165 im->sources = pmc->sources;
1166 for (psf = im->sources; psf; psf = psf->sf_next)
1167 psf->sf_crcount = im->crcount;
1168 }
1169 in_dev_put(pmc->interface);
1170 }
1171 spin_unlock_bh(&im->lock);
1172 }
1173
1174 /*
1175 * flush ip_mc_list deleted records
1176 */
1177 static void igmpv3_clear_delrec(struct in_device *in_dev)
1178 {
1179 struct ip_mc_list *pmc, *nextpmc;
1180
1181 spin_lock_bh(&in_dev->mc_tomb_lock);
1182 pmc = in_dev->mc_tomb;
1183 in_dev->mc_tomb = NULL;
1184 spin_unlock_bh(&in_dev->mc_tomb_lock);
1185
1186 for (; pmc; pmc = nextpmc) {
1187 nextpmc = pmc->next;
1188 ip_mc_clear_src(pmc);
1189 in_dev_put(pmc->interface);
1190 kfree(pmc);
1191 }
1192 /* clear dead sources, too */
1193 rcu_read_lock();
1194 for_each_pmc_rcu(in_dev, pmc) {
1195 struct ip_sf_list *psf, *psf_next;
1196
1197 spin_lock_bh(&pmc->lock);
1198 psf = pmc->tomb;
1199 pmc->tomb = NULL;
1200 spin_unlock_bh(&pmc->lock);
1201 for (; psf; psf = psf_next) {
1202 psf_next = psf->sf_next;
1203 kfree(psf);
1204 }
1205 }
1206 rcu_read_unlock();
1207 }
1208 #endif
1209
1210 static void igmp_group_dropped(struct ip_mc_list *im)
1211 {
1212 struct in_device *in_dev = im->interface;
1213 #ifdef CONFIG_IP_MULTICAST
1214 struct net *net = dev_net(in_dev->dev);
1215 int reporter;
1216 #endif
1217
1218 if (im->loaded) {
1219 im->loaded = 0;
1220 ip_mc_filter_del(in_dev, im->multiaddr);
1221 }
1222
1223 #ifdef CONFIG_IP_MULTICAST
1224 if (im->multiaddr == IGMP_ALL_HOSTS)
1225 return;
1226 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1227 return;
1228
1229 reporter = im->reporter;
1230 igmp_stop_timer(im);
1231
1232 if (!in_dev->dead) {
1233 if (IGMP_V1_SEEN(in_dev))
1234 return;
1235 if (IGMP_V2_SEEN(in_dev)) {
1236 if (reporter)
1237 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1238 return;
1239 }
1240 /* IGMPv3 */
1241 igmpv3_add_delrec(in_dev, im);
1242
1243 igmp_ifc_event(in_dev);
1244 }
1245 #endif
1246 }
1247
1248 static void igmp_group_added(struct ip_mc_list *im)
1249 {
1250 struct in_device *in_dev = im->interface;
1251 #ifdef CONFIG_IP_MULTICAST
1252 struct net *net = dev_net(in_dev->dev);
1253 #endif
1254
1255 if (im->loaded == 0) {
1256 im->loaded = 1;
1257 ip_mc_filter_add(in_dev, im->multiaddr);
1258 }
1259
1260 #ifdef CONFIG_IP_MULTICAST
1261 if (im->multiaddr == IGMP_ALL_HOSTS)
1262 return;
1263 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1264 return;
1265
1266 if (in_dev->dead)
1267 return;
1268 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1269 spin_lock_bh(&im->lock);
1270 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1271 spin_unlock_bh(&im->lock);
1272 return;
1273 }
1274 /* else, v3 */
1275
1276 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1277 igmp_ifc_event(in_dev);
1278 #endif
1279 }
1280
1281
1282 /*
1283 * Multicast list managers
1284 */
1285
1286 static u32 ip_mc_hash(const struct ip_mc_list *im)
1287 {
1288 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1289 }
1290
1291 static void ip_mc_hash_add(struct in_device *in_dev,
1292 struct ip_mc_list *im)
1293 {
1294 struct ip_mc_list __rcu **mc_hash;
1295 u32 hash;
1296
1297 mc_hash = rtnl_dereference(in_dev->mc_hash);
1298 if (mc_hash) {
1299 hash = ip_mc_hash(im);
1300 im->next_hash = mc_hash[hash];
1301 rcu_assign_pointer(mc_hash[hash], im);
1302 return;
1303 }
1304
1305 /* do not use a hash table for small number of items */
1306 if (in_dev->mc_count < 4)
1307 return;
1308
1309 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1310 GFP_KERNEL);
1311 if (!mc_hash)
1312 return;
1313
1314 for_each_pmc_rtnl(in_dev, im) {
1315 hash = ip_mc_hash(im);
1316 im->next_hash = mc_hash[hash];
1317 RCU_INIT_POINTER(mc_hash[hash], im);
1318 }
1319
1320 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1321 }
1322
1323 static void ip_mc_hash_remove(struct in_device *in_dev,
1324 struct ip_mc_list *im)
1325 {
1326 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1327 struct ip_mc_list *aux;
1328
1329 if (!mc_hash)
1330 return;
1331 mc_hash += ip_mc_hash(im);
1332 while ((aux = rtnl_dereference(*mc_hash)) != im)
1333 mc_hash = &aux->next_hash;
1334 *mc_hash = im->next_hash;
1335 }
1336
1337
1338 /*
1339 * A socket has joined a multicast group on device dev.
1340 */
1341
1342 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1343 {
1344 struct ip_mc_list *im;
1345 #ifdef CONFIG_IP_MULTICAST
1346 struct net *net = dev_net(in_dev->dev);
1347 #endif
1348
1349 ASSERT_RTNL();
1350
1351 for_each_pmc_rtnl(in_dev, im) {
1352 if (im->multiaddr == addr) {
1353 im->users++;
1354 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1355 goto out;
1356 }
1357 }
1358
1359 im = kzalloc(sizeof(*im), GFP_KERNEL);
1360 if (!im)
1361 goto out;
1362
1363 im->users = 1;
1364 im->interface = in_dev;
1365 in_dev_hold(in_dev);
1366 im->multiaddr = addr;
1367 /* initial mode is (EX, empty) */
1368 im->sfmode = MCAST_EXCLUDE;
1369 im->sfcount[MCAST_EXCLUDE] = 1;
1370 atomic_set(&im->refcnt, 1);
1371 spin_lock_init(&im->lock);
1372 #ifdef CONFIG_IP_MULTICAST
1373 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1374 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1375 #endif
1376
1377 im->next_rcu = in_dev->mc_list;
1378 in_dev->mc_count++;
1379 rcu_assign_pointer(in_dev->mc_list, im);
1380
1381 ip_mc_hash_add(in_dev, im);
1382
1383 #ifdef CONFIG_IP_MULTICAST
1384 igmpv3_del_delrec(in_dev, im);
1385 #endif
1386 igmp_group_added(im);
1387 if (!in_dev->dead)
1388 ip_rt_multicast_event(in_dev);
1389 out:
1390 return;
1391 }
1392 EXPORT_SYMBOL(ip_mc_inc_group);
1393
1394 static int ip_mc_check_iphdr(struct sk_buff *skb)
1395 {
1396 const struct iphdr *iph;
1397 unsigned int len;
1398 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1399
1400 if (!pskb_may_pull(skb, offset))
1401 return -EINVAL;
1402
1403 iph = ip_hdr(skb);
1404
1405 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1406 return -EINVAL;
1407
1408 offset += ip_hdrlen(skb) - sizeof(*iph);
1409
1410 if (!pskb_may_pull(skb, offset))
1411 return -EINVAL;
1412
1413 iph = ip_hdr(skb);
1414
1415 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1416 return -EINVAL;
1417
1418 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1419 if (skb->len < len || len < offset)
1420 return -EINVAL;
1421
1422 skb_set_transport_header(skb, offset);
1423
1424 return 0;
1425 }
1426
1427 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1428 {
1429 unsigned int len = skb_transport_offset(skb);
1430
1431 len += sizeof(struct igmpv3_report);
1432
1433 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1434 }
1435
1436 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1437 {
1438 unsigned int len = skb_transport_offset(skb);
1439
1440 len += sizeof(struct igmphdr);
1441 if (skb->len < len)
1442 return -EINVAL;
1443
1444 /* IGMPv{1,2}? */
1445 if (skb->len != len) {
1446 /* or IGMPv3? */
1447 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1448 if (skb->len < len || !pskb_may_pull(skb, len))
1449 return -EINVAL;
1450 }
1451
1452 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1453 * all-systems destination addresses (224.0.0.1) for general queries
1454 */
1455 if (!igmp_hdr(skb)->group &&
1456 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1457 return -EINVAL;
1458
1459 return 0;
1460 }
1461
1462 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1463 {
1464 switch (igmp_hdr(skb)->type) {
1465 case IGMP_HOST_LEAVE_MESSAGE:
1466 case IGMP_HOST_MEMBERSHIP_REPORT:
1467 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1468 /* fall through */
1469 return 0;
1470 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1471 return ip_mc_check_igmp_reportv3(skb);
1472 case IGMP_HOST_MEMBERSHIP_QUERY:
1473 return ip_mc_check_igmp_query(skb);
1474 default:
1475 return -ENOMSG;
1476 }
1477 }
1478
1479 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1480 {
1481 return skb_checksum_simple_validate(skb);
1482 }
1483
1484 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1485
1486 {
1487 struct sk_buff *skb_chk;
1488 unsigned int transport_len;
1489 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1490 int ret = -EINVAL;
1491
1492 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1493
1494 skb_chk = skb_checksum_trimmed(skb, transport_len,
1495 ip_mc_validate_checksum);
1496 if (!skb_chk)
1497 goto err;
1498
1499 if (!pskb_may_pull(skb_chk, len))
1500 goto err;
1501
1502 ret = ip_mc_check_igmp_msg(skb_chk);
1503 if (ret)
1504 goto err;
1505
1506 if (skb_trimmed)
1507 *skb_trimmed = skb_chk;
1508 /* free now unneeded clone */
1509 else if (skb_chk != skb)
1510 kfree_skb(skb_chk);
1511
1512 ret = 0;
1513
1514 err:
1515 if (ret && skb_chk && skb_chk != skb)
1516 kfree_skb(skb_chk);
1517
1518 return ret;
1519 }
1520
1521 /**
1522 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1523 * @skb: the skb to validate
1524 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1525 *
1526 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1527 * skb transport header accordingly and returns zero.
1528 *
1529 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1530 * standard
1531 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1532 * -ENOMEM: A memory allocation failure happened.
1533 *
1534 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1535 * to NULL): After parsing an IGMP packet successfully it will point to
1536 * an skb which has its tail aligned to the IP packet end. This might
1537 * either be the originally provided skb or a trimmed, cloned version if
1538 * the skb frame had data beyond the IP packet. A cloned skb allows us
1539 * to leave the original skb and its full frame unchanged (which might be
1540 * desirable for layer 2 frame jugglers).
1541 *
1542 * Caller needs to set the skb network header and free any returned skb if it
1543 * differs from the provided skb.
1544 */
1545 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1546 {
1547 int ret = ip_mc_check_iphdr(skb);
1548
1549 if (ret < 0)
1550 return ret;
1551
1552 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1553 return -ENOMSG;
1554
1555 return __ip_mc_check_igmp(skb, skb_trimmed);
1556 }
1557 EXPORT_SYMBOL(ip_mc_check_igmp);
1558
1559 /*
1560 * Resend IGMP JOIN report; used by netdev notifier.
1561 */
1562 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1563 {
1564 #ifdef CONFIG_IP_MULTICAST
1565 struct ip_mc_list *im;
1566 int type;
1567 struct net *net = dev_net(in_dev->dev);
1568
1569 ASSERT_RTNL();
1570
1571 for_each_pmc_rtnl(in_dev, im) {
1572 if (im->multiaddr == IGMP_ALL_HOSTS)
1573 continue;
1574 if (ipv4_is_local_multicast(im->multiaddr) &&
1575 !net->ipv4.sysctl_igmp_llm_reports)
1576 continue;
1577
1578 /* a failover is happening and switches
1579 * must be notified immediately
1580 */
1581 if (IGMP_V1_SEEN(in_dev))
1582 type = IGMP_HOST_MEMBERSHIP_REPORT;
1583 else if (IGMP_V2_SEEN(in_dev))
1584 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1585 else
1586 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1587 igmp_send_report(in_dev, im, type);
1588 }
1589 #endif
1590 }
1591
1592 /*
1593 * A socket has left a multicast group on device dev
1594 */
1595
1596 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1597 {
1598 struct ip_mc_list *i;
1599 struct ip_mc_list __rcu **ip;
1600
1601 ASSERT_RTNL();
1602
1603 for (ip = &in_dev->mc_list;
1604 (i = rtnl_dereference(*ip)) != NULL;
1605 ip = &i->next_rcu) {
1606 if (i->multiaddr == addr) {
1607 if (--i->users == 0) {
1608 ip_mc_hash_remove(in_dev, i);
1609 *ip = i->next_rcu;
1610 in_dev->mc_count--;
1611 igmp_group_dropped(i);
1612 ip_mc_clear_src(i);
1613
1614 if (!in_dev->dead)
1615 ip_rt_multicast_event(in_dev);
1616
1617 ip_ma_put(i);
1618 return;
1619 }
1620 break;
1621 }
1622 }
1623 }
1624 EXPORT_SYMBOL(ip_mc_dec_group);
1625
1626 /* Device changing type */
1627
1628 void ip_mc_unmap(struct in_device *in_dev)
1629 {
1630 struct ip_mc_list *pmc;
1631
1632 ASSERT_RTNL();
1633
1634 for_each_pmc_rtnl(in_dev, pmc)
1635 igmp_group_dropped(pmc);
1636 }
1637
1638 void ip_mc_remap(struct in_device *in_dev)
1639 {
1640 struct ip_mc_list *pmc;
1641
1642 ASSERT_RTNL();
1643
1644 for_each_pmc_rtnl(in_dev, pmc) {
1645 #ifdef CONFIG_IP_MULTICAST
1646 igmpv3_del_delrec(in_dev, pmc);
1647 #endif
1648 igmp_group_added(pmc);
1649 }
1650 }
1651
1652 /* Device going down */
1653
1654 void ip_mc_down(struct in_device *in_dev)
1655 {
1656 struct ip_mc_list *pmc;
1657
1658 ASSERT_RTNL();
1659
1660 for_each_pmc_rtnl(in_dev, pmc)
1661 igmp_group_dropped(pmc);
1662
1663 #ifdef CONFIG_IP_MULTICAST
1664 in_dev->mr_ifc_count = 0;
1665 if (del_timer(&in_dev->mr_ifc_timer))
1666 __in_dev_put(in_dev);
1667 in_dev->mr_gq_running = 0;
1668 if (del_timer(&in_dev->mr_gq_timer))
1669 __in_dev_put(in_dev);
1670 #endif
1671
1672 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1673 }
1674
1675 void ip_mc_init_dev(struct in_device *in_dev)
1676 {
1677 #ifdef CONFIG_IP_MULTICAST
1678 struct net *net = dev_net(in_dev->dev);
1679 #endif
1680 ASSERT_RTNL();
1681
1682 #ifdef CONFIG_IP_MULTICAST
1683 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1684 (unsigned long)in_dev);
1685 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1686 (unsigned long)in_dev);
1687 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1688 #endif
1689
1690 spin_lock_init(&in_dev->mc_tomb_lock);
1691 }
1692
1693 /* Device going up */
1694
1695 void ip_mc_up(struct in_device *in_dev)
1696 {
1697 struct ip_mc_list *pmc;
1698 #ifdef CONFIG_IP_MULTICAST
1699 struct net *net = dev_net(in_dev->dev);
1700 #endif
1701
1702 ASSERT_RTNL();
1703
1704 #ifdef CONFIG_IP_MULTICAST
1705 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1706 #endif
1707 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1708
1709 for_each_pmc_rtnl(in_dev, pmc) {
1710 #ifdef CONFIG_IP_MULTICAST
1711 igmpv3_del_delrec(in_dev, pmc);
1712 #endif
1713 igmp_group_added(pmc);
1714 }
1715 }
1716
1717 /*
1718 * Device is about to be destroyed: clean up.
1719 */
1720
1721 void ip_mc_destroy_dev(struct in_device *in_dev)
1722 {
1723 struct ip_mc_list *i;
1724
1725 ASSERT_RTNL();
1726
1727 /* Deactivate timers */
1728 ip_mc_down(in_dev);
1729 #ifdef CONFIG_IP_MULTICAST
1730 igmpv3_clear_delrec(in_dev);
1731 #endif
1732
1733 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1734 in_dev->mc_list = i->next_rcu;
1735 in_dev->mc_count--;
1736 ip_ma_put(i);
1737 }
1738 }
1739
1740 /* RTNL is locked */
1741 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1742 {
1743 struct net_device *dev = NULL;
1744 struct in_device *idev = NULL;
1745
1746 if (imr->imr_ifindex) {
1747 idev = inetdev_by_index(net, imr->imr_ifindex);
1748 return idev;
1749 }
1750 if (imr->imr_address.s_addr) {
1751 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1752 if (!dev)
1753 return NULL;
1754 }
1755
1756 if (!dev) {
1757 struct rtable *rt = ip_route_output(net,
1758 imr->imr_multiaddr.s_addr,
1759 0, 0, 0);
1760 if (!IS_ERR(rt)) {
1761 dev = rt->dst.dev;
1762 ip_rt_put(rt);
1763 }
1764 }
1765 if (dev) {
1766 imr->imr_ifindex = dev->ifindex;
1767 idev = __in_dev_get_rtnl(dev);
1768 }
1769 return idev;
1770 }
1771
1772 /*
1773 * Join a socket to a group
1774 */
1775
1776 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1777 __be32 *psfsrc)
1778 {
1779 struct ip_sf_list *psf, *psf_prev;
1780 int rv = 0;
1781
1782 psf_prev = NULL;
1783 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1784 if (psf->sf_inaddr == *psfsrc)
1785 break;
1786 psf_prev = psf;
1787 }
1788 if (!psf || psf->sf_count[sfmode] == 0) {
1789 /* source filter not found, or count wrong => bug */
1790 return -ESRCH;
1791 }
1792 psf->sf_count[sfmode]--;
1793 if (psf->sf_count[sfmode] == 0) {
1794 ip_rt_multicast_event(pmc->interface);
1795 }
1796 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1797 #ifdef CONFIG_IP_MULTICAST
1798 struct in_device *in_dev = pmc->interface;
1799 struct net *net = dev_net(in_dev->dev);
1800 #endif
1801
1802 /* no more filters for this source */
1803 if (psf_prev)
1804 psf_prev->sf_next = psf->sf_next;
1805 else
1806 pmc->sources = psf->sf_next;
1807 #ifdef CONFIG_IP_MULTICAST
1808 if (psf->sf_oldin &&
1809 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1810 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1811 psf->sf_next = pmc->tomb;
1812 pmc->tomb = psf;
1813 rv = 1;
1814 } else
1815 #endif
1816 kfree(psf);
1817 }
1818 return rv;
1819 }
1820
1821 #ifndef CONFIG_IP_MULTICAST
1822 #define igmp_ifc_event(x) do { } while (0)
1823 #endif
1824
1825 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1826 int sfcount, __be32 *psfsrc, int delta)
1827 {
1828 struct ip_mc_list *pmc;
1829 int changerec = 0;
1830 int i, err;
1831
1832 if (!in_dev)
1833 return -ENODEV;
1834 rcu_read_lock();
1835 for_each_pmc_rcu(in_dev, pmc) {
1836 if (*pmca == pmc->multiaddr)
1837 break;
1838 }
1839 if (!pmc) {
1840 /* MCA not found?? bug */
1841 rcu_read_unlock();
1842 return -ESRCH;
1843 }
1844 spin_lock_bh(&pmc->lock);
1845 rcu_read_unlock();
1846 #ifdef CONFIG_IP_MULTICAST
1847 sf_markstate(pmc);
1848 #endif
1849 if (!delta) {
1850 err = -EINVAL;
1851 if (!pmc->sfcount[sfmode])
1852 goto out_unlock;
1853 pmc->sfcount[sfmode]--;
1854 }
1855 err = 0;
1856 for (i = 0; i < sfcount; i++) {
1857 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1858
1859 changerec |= rv > 0;
1860 if (!err && rv < 0)
1861 err = rv;
1862 }
1863 if (pmc->sfmode == MCAST_EXCLUDE &&
1864 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1865 pmc->sfcount[MCAST_INCLUDE]) {
1866 #ifdef CONFIG_IP_MULTICAST
1867 struct ip_sf_list *psf;
1868 struct net *net = dev_net(in_dev->dev);
1869 #endif
1870
1871 /* filter mode change */
1872 pmc->sfmode = MCAST_INCLUDE;
1873 #ifdef CONFIG_IP_MULTICAST
1874 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1875 in_dev->mr_ifc_count = pmc->crcount;
1876 for (psf = pmc->sources; psf; psf = psf->sf_next)
1877 psf->sf_crcount = 0;
1878 igmp_ifc_event(pmc->interface);
1879 } else if (sf_setstate(pmc) || changerec) {
1880 igmp_ifc_event(pmc->interface);
1881 #endif
1882 }
1883 out_unlock:
1884 spin_unlock_bh(&pmc->lock);
1885 return err;
1886 }
1887
1888 /*
1889 * Add multicast single-source filter to the interface list
1890 */
1891 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1892 __be32 *psfsrc)
1893 {
1894 struct ip_sf_list *psf, *psf_prev;
1895
1896 psf_prev = NULL;
1897 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1898 if (psf->sf_inaddr == *psfsrc)
1899 break;
1900 psf_prev = psf;
1901 }
1902 if (!psf) {
1903 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1904 if (!psf)
1905 return -ENOBUFS;
1906 psf->sf_inaddr = *psfsrc;
1907 if (psf_prev) {
1908 psf_prev->sf_next = psf;
1909 } else
1910 pmc->sources = psf;
1911 }
1912 psf->sf_count[sfmode]++;
1913 if (psf->sf_count[sfmode] == 1) {
1914 ip_rt_multicast_event(pmc->interface);
1915 }
1916 return 0;
1917 }
1918
1919 #ifdef CONFIG_IP_MULTICAST
1920 static void sf_markstate(struct ip_mc_list *pmc)
1921 {
1922 struct ip_sf_list *psf;
1923 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1924
1925 for (psf = pmc->sources; psf; psf = psf->sf_next)
1926 if (pmc->sfcount[MCAST_EXCLUDE]) {
1927 psf->sf_oldin = mca_xcount ==
1928 psf->sf_count[MCAST_EXCLUDE] &&
1929 !psf->sf_count[MCAST_INCLUDE];
1930 } else
1931 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1932 }
1933
1934 static int sf_setstate(struct ip_mc_list *pmc)
1935 {
1936 struct ip_sf_list *psf, *dpsf;
1937 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1938 int qrv = pmc->interface->mr_qrv;
1939 int new_in, rv;
1940
1941 rv = 0;
1942 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1943 if (pmc->sfcount[MCAST_EXCLUDE]) {
1944 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1945 !psf->sf_count[MCAST_INCLUDE];
1946 } else
1947 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1948 if (new_in) {
1949 if (!psf->sf_oldin) {
1950 struct ip_sf_list *prev = NULL;
1951
1952 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1953 if (dpsf->sf_inaddr == psf->sf_inaddr)
1954 break;
1955 prev = dpsf;
1956 }
1957 if (dpsf) {
1958 if (prev)
1959 prev->sf_next = dpsf->sf_next;
1960 else
1961 pmc->tomb = dpsf->sf_next;
1962 kfree(dpsf);
1963 }
1964 psf->sf_crcount = qrv;
1965 rv++;
1966 }
1967 } else if (psf->sf_oldin) {
1968
1969 psf->sf_crcount = 0;
1970 /*
1971 * add or update "delete" records if an active filter
1972 * is now inactive
1973 */
1974 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1975 if (dpsf->sf_inaddr == psf->sf_inaddr)
1976 break;
1977 if (!dpsf) {
1978 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1979 if (!dpsf)
1980 continue;
1981 *dpsf = *psf;
1982 /* pmc->lock held by callers */
1983 dpsf->sf_next = pmc->tomb;
1984 pmc->tomb = dpsf;
1985 }
1986 dpsf->sf_crcount = qrv;
1987 rv++;
1988 }
1989 }
1990 return rv;
1991 }
1992 #endif
1993
1994 /*
1995 * Add multicast source filter list to the interface list
1996 */
1997 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1998 int sfcount, __be32 *psfsrc, int delta)
1999 {
2000 struct ip_mc_list *pmc;
2001 int isexclude;
2002 int i, err;
2003
2004 if (!in_dev)
2005 return -ENODEV;
2006 rcu_read_lock();
2007 for_each_pmc_rcu(in_dev, pmc) {
2008 if (*pmca == pmc->multiaddr)
2009 break;
2010 }
2011 if (!pmc) {
2012 /* MCA not found?? bug */
2013 rcu_read_unlock();
2014 return -ESRCH;
2015 }
2016 spin_lock_bh(&pmc->lock);
2017 rcu_read_unlock();
2018
2019 #ifdef CONFIG_IP_MULTICAST
2020 sf_markstate(pmc);
2021 #endif
2022 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2023 if (!delta)
2024 pmc->sfcount[sfmode]++;
2025 err = 0;
2026 for (i = 0; i < sfcount; i++) {
2027 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2028 if (err)
2029 break;
2030 }
2031 if (err) {
2032 int j;
2033
2034 if (!delta)
2035 pmc->sfcount[sfmode]--;
2036 for (j = 0; j < i; j++)
2037 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2038 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2039 #ifdef CONFIG_IP_MULTICAST
2040 struct ip_sf_list *psf;
2041 struct net *net = dev_net(pmc->interface->dev);
2042 in_dev = pmc->interface;
2043 #endif
2044
2045 /* filter mode change */
2046 if (pmc->sfcount[MCAST_EXCLUDE])
2047 pmc->sfmode = MCAST_EXCLUDE;
2048 else if (pmc->sfcount[MCAST_INCLUDE])
2049 pmc->sfmode = MCAST_INCLUDE;
2050 #ifdef CONFIG_IP_MULTICAST
2051 /* else no filters; keep old mode for reports */
2052
2053 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2054 in_dev->mr_ifc_count = pmc->crcount;
2055 for (psf = pmc->sources; psf; psf = psf->sf_next)
2056 psf->sf_crcount = 0;
2057 igmp_ifc_event(in_dev);
2058 } else if (sf_setstate(pmc)) {
2059 igmp_ifc_event(in_dev);
2060 #endif
2061 }
2062 spin_unlock_bh(&pmc->lock);
2063 return err;
2064 }
2065
2066 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2067 {
2068 struct ip_sf_list *psf, *nextpsf;
2069
2070 for (psf = pmc->tomb; psf; psf = nextpsf) {
2071 nextpsf = psf->sf_next;
2072 kfree(psf);
2073 }
2074 pmc->tomb = NULL;
2075 for (psf = pmc->sources; psf; psf = nextpsf) {
2076 nextpsf = psf->sf_next;
2077 kfree(psf);
2078 }
2079 pmc->sources = NULL;
2080 pmc->sfmode = MCAST_EXCLUDE;
2081 pmc->sfcount[MCAST_INCLUDE] = 0;
2082 pmc->sfcount[MCAST_EXCLUDE] = 1;
2083 }
2084
2085 /* Join a multicast group
2086 */
2087
2088 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2089 {
2090 __be32 addr = imr->imr_multiaddr.s_addr;
2091 struct ip_mc_socklist *iml, *i;
2092 struct in_device *in_dev;
2093 struct inet_sock *inet = inet_sk(sk);
2094 struct net *net = sock_net(sk);
2095 int ifindex;
2096 int count = 0;
2097 int err;
2098
2099 ASSERT_RTNL();
2100
2101 if (!ipv4_is_multicast(addr))
2102 return -EINVAL;
2103
2104 in_dev = ip_mc_find_dev(net, imr);
2105
2106 if (!in_dev) {
2107 err = -ENODEV;
2108 goto done;
2109 }
2110
2111 err = -EADDRINUSE;
2112 ifindex = imr->imr_ifindex;
2113 for_each_pmc_rtnl(inet, i) {
2114 if (i->multi.imr_multiaddr.s_addr == addr &&
2115 i->multi.imr_ifindex == ifindex)
2116 goto done;
2117 count++;
2118 }
2119 err = -ENOBUFS;
2120 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2121 goto done;
2122 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2123 if (!iml)
2124 goto done;
2125
2126 memcpy(&iml->multi, imr, sizeof(*imr));
2127 iml->next_rcu = inet->mc_list;
2128 iml->sflist = NULL;
2129 iml->sfmode = MCAST_EXCLUDE;
2130 rcu_assign_pointer(inet->mc_list, iml);
2131 ip_mc_inc_group(in_dev, addr);
2132 err = 0;
2133 done:
2134 return err;
2135 }
2136 EXPORT_SYMBOL(ip_mc_join_group);
2137
2138 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2139 struct in_device *in_dev)
2140 {
2141 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2142 int err;
2143
2144 if (!psf) {
2145 /* any-source empty exclude case */
2146 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2147 iml->sfmode, 0, NULL, 0);
2148 }
2149 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2150 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2151 RCU_INIT_POINTER(iml->sflist, NULL);
2152 /* decrease mem now to avoid the memleak warning */
2153 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2154 kfree_rcu(psf, rcu);
2155 return err;
2156 }
2157
2158 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2159 {
2160 struct inet_sock *inet = inet_sk(sk);
2161 struct ip_mc_socklist *iml;
2162 struct ip_mc_socklist __rcu **imlp;
2163 struct in_device *in_dev;
2164 struct net *net = sock_net(sk);
2165 __be32 group = imr->imr_multiaddr.s_addr;
2166 u32 ifindex;
2167 int ret = -EADDRNOTAVAIL;
2168
2169 ASSERT_RTNL();
2170
2171 in_dev = ip_mc_find_dev(net, imr);
2172 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2173 ret = -ENODEV;
2174 goto out;
2175 }
2176 ifindex = imr->imr_ifindex;
2177 for (imlp = &inet->mc_list;
2178 (iml = rtnl_dereference(*imlp)) != NULL;
2179 imlp = &iml->next_rcu) {
2180 if (iml->multi.imr_multiaddr.s_addr != group)
2181 continue;
2182 if (ifindex) {
2183 if (iml->multi.imr_ifindex != ifindex)
2184 continue;
2185 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2186 iml->multi.imr_address.s_addr)
2187 continue;
2188
2189 (void) ip_mc_leave_src(sk, iml, in_dev);
2190
2191 *imlp = iml->next_rcu;
2192
2193 if (in_dev)
2194 ip_mc_dec_group(in_dev, group);
2195
2196 /* decrease mem now to avoid the memleak warning */
2197 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2198 kfree_rcu(iml, rcu);
2199 return 0;
2200 }
2201 out:
2202 return ret;
2203 }
2204 EXPORT_SYMBOL(ip_mc_leave_group);
2205
2206 int ip_mc_source(int add, int omode, struct sock *sk, struct
2207 ip_mreq_source *mreqs, int ifindex)
2208 {
2209 int err;
2210 struct ip_mreqn imr;
2211 __be32 addr = mreqs->imr_multiaddr;
2212 struct ip_mc_socklist *pmc;
2213 struct in_device *in_dev = NULL;
2214 struct inet_sock *inet = inet_sk(sk);
2215 struct ip_sf_socklist *psl;
2216 struct net *net = sock_net(sk);
2217 int leavegroup = 0;
2218 int i, j, rv;
2219
2220 if (!ipv4_is_multicast(addr))
2221 return -EINVAL;
2222
2223 ASSERT_RTNL();
2224
2225 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2226 imr.imr_address.s_addr = mreqs->imr_interface;
2227 imr.imr_ifindex = ifindex;
2228 in_dev = ip_mc_find_dev(net, &imr);
2229
2230 if (!in_dev) {
2231 err = -ENODEV;
2232 goto done;
2233 }
2234 err = -EADDRNOTAVAIL;
2235
2236 for_each_pmc_rtnl(inet, pmc) {
2237 if ((pmc->multi.imr_multiaddr.s_addr ==
2238 imr.imr_multiaddr.s_addr) &&
2239 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2240 break;
2241 }
2242 if (!pmc) { /* must have a prior join */
2243 err = -EINVAL;
2244 goto done;
2245 }
2246 /* if a source filter was set, must be the same mode as before */
2247 if (pmc->sflist) {
2248 if (pmc->sfmode != omode) {
2249 err = -EINVAL;
2250 goto done;
2251 }
2252 } else if (pmc->sfmode != omode) {
2253 /* allow mode switches for empty-set filters */
2254 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2255 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2256 NULL, 0);
2257 pmc->sfmode = omode;
2258 }
2259
2260 psl = rtnl_dereference(pmc->sflist);
2261 if (!add) {
2262 if (!psl)
2263 goto done; /* err = -EADDRNOTAVAIL */
2264 rv = !0;
2265 for (i = 0; i < psl->sl_count; i++) {
2266 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2267 sizeof(__be32));
2268 if (rv == 0)
2269 break;
2270 }
2271 if (rv) /* source not found */
2272 goto done; /* err = -EADDRNOTAVAIL */
2273
2274 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2275 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2276 leavegroup = 1;
2277 goto done;
2278 }
2279
2280 /* update the interface filter */
2281 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2282 &mreqs->imr_sourceaddr, 1);
2283
2284 for (j = i+1; j < psl->sl_count; j++)
2285 psl->sl_addr[j-1] = psl->sl_addr[j];
2286 psl->sl_count--;
2287 err = 0;
2288 goto done;
2289 }
2290 /* else, add a new source to the filter */
2291
2292 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2293 err = -ENOBUFS;
2294 goto done;
2295 }
2296 if (!psl || psl->sl_count == psl->sl_max) {
2297 struct ip_sf_socklist *newpsl;
2298 int count = IP_SFBLOCK;
2299
2300 if (psl)
2301 count += psl->sl_max;
2302 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2303 if (!newpsl) {
2304 err = -ENOBUFS;
2305 goto done;
2306 }
2307 newpsl->sl_max = count;
2308 newpsl->sl_count = count - IP_SFBLOCK;
2309 if (psl) {
2310 for (i = 0; i < psl->sl_count; i++)
2311 newpsl->sl_addr[i] = psl->sl_addr[i];
2312 /* decrease mem now to avoid the memleak warning */
2313 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2314 kfree_rcu(psl, rcu);
2315 }
2316 rcu_assign_pointer(pmc->sflist, newpsl);
2317 psl = newpsl;
2318 }
2319 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2320 for (i = 0; i < psl->sl_count; i++) {
2321 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2322 sizeof(__be32));
2323 if (rv == 0)
2324 break;
2325 }
2326 if (rv == 0) /* address already there is an error */
2327 goto done;
2328 for (j = psl->sl_count-1; j >= i; j--)
2329 psl->sl_addr[j+1] = psl->sl_addr[j];
2330 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2331 psl->sl_count++;
2332 err = 0;
2333 /* update the interface list */
2334 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2335 &mreqs->imr_sourceaddr, 1);
2336 done:
2337 if (leavegroup)
2338 err = ip_mc_leave_group(sk, &imr);
2339 return err;
2340 }
2341
2342 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2343 {
2344 int err = 0;
2345 struct ip_mreqn imr;
2346 __be32 addr = msf->imsf_multiaddr;
2347 struct ip_mc_socklist *pmc;
2348 struct in_device *in_dev;
2349 struct inet_sock *inet = inet_sk(sk);
2350 struct ip_sf_socklist *newpsl, *psl;
2351 struct net *net = sock_net(sk);
2352 int leavegroup = 0;
2353
2354 if (!ipv4_is_multicast(addr))
2355 return -EINVAL;
2356 if (msf->imsf_fmode != MCAST_INCLUDE &&
2357 msf->imsf_fmode != MCAST_EXCLUDE)
2358 return -EINVAL;
2359
2360 ASSERT_RTNL();
2361
2362 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2363 imr.imr_address.s_addr = msf->imsf_interface;
2364 imr.imr_ifindex = ifindex;
2365 in_dev = ip_mc_find_dev(net, &imr);
2366
2367 if (!in_dev) {
2368 err = -ENODEV;
2369 goto done;
2370 }
2371
2372 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2373 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2374 leavegroup = 1;
2375 goto done;
2376 }
2377
2378 for_each_pmc_rtnl(inet, pmc) {
2379 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2380 pmc->multi.imr_ifindex == imr.imr_ifindex)
2381 break;
2382 }
2383 if (!pmc) { /* must have a prior join */
2384 err = -EINVAL;
2385 goto done;
2386 }
2387 if (msf->imsf_numsrc) {
2388 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2389 GFP_KERNEL);
2390 if (!newpsl) {
2391 err = -ENOBUFS;
2392 goto done;
2393 }
2394 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2395 memcpy(newpsl->sl_addr, msf->imsf_slist,
2396 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2397 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2398 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2399 if (err) {
2400 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2401 goto done;
2402 }
2403 } else {
2404 newpsl = NULL;
2405 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2406 msf->imsf_fmode, 0, NULL, 0);
2407 }
2408 psl = rtnl_dereference(pmc->sflist);
2409 if (psl) {
2410 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2411 psl->sl_count, psl->sl_addr, 0);
2412 /* decrease mem now to avoid the memleak warning */
2413 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2414 kfree_rcu(psl, rcu);
2415 } else
2416 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2417 0, NULL, 0);
2418 rcu_assign_pointer(pmc->sflist, newpsl);
2419 pmc->sfmode = msf->imsf_fmode;
2420 err = 0;
2421 done:
2422 if (leavegroup)
2423 err = ip_mc_leave_group(sk, &imr);
2424 return err;
2425 }
2426
2427 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2428 struct ip_msfilter __user *optval, int __user *optlen)
2429 {
2430 int err, len, count, copycount;
2431 struct ip_mreqn imr;
2432 __be32 addr = msf->imsf_multiaddr;
2433 struct ip_mc_socklist *pmc;
2434 struct in_device *in_dev;
2435 struct inet_sock *inet = inet_sk(sk);
2436 struct ip_sf_socklist *psl;
2437 struct net *net = sock_net(sk);
2438
2439 ASSERT_RTNL();
2440
2441 if (!ipv4_is_multicast(addr))
2442 return -EINVAL;
2443
2444 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2445 imr.imr_address.s_addr = msf->imsf_interface;
2446 imr.imr_ifindex = 0;
2447 in_dev = ip_mc_find_dev(net, &imr);
2448
2449 if (!in_dev) {
2450 err = -ENODEV;
2451 goto done;
2452 }
2453 err = -EADDRNOTAVAIL;
2454
2455 for_each_pmc_rtnl(inet, pmc) {
2456 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2457 pmc->multi.imr_ifindex == imr.imr_ifindex)
2458 break;
2459 }
2460 if (!pmc) /* must have a prior join */
2461 goto done;
2462 msf->imsf_fmode = pmc->sfmode;
2463 psl = rtnl_dereference(pmc->sflist);
2464 if (!psl) {
2465 len = 0;
2466 count = 0;
2467 } else {
2468 count = psl->sl_count;
2469 }
2470 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2471 len = copycount * sizeof(psl->sl_addr[0]);
2472 msf->imsf_numsrc = count;
2473 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2474 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2475 return -EFAULT;
2476 }
2477 if (len &&
2478 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2479 return -EFAULT;
2480 return 0;
2481 done:
2482 return err;
2483 }
2484
2485 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2486 struct group_filter __user *optval, int __user *optlen)
2487 {
2488 int err, i, count, copycount;
2489 struct sockaddr_in *psin;
2490 __be32 addr;
2491 struct ip_mc_socklist *pmc;
2492 struct inet_sock *inet = inet_sk(sk);
2493 struct ip_sf_socklist *psl;
2494
2495 ASSERT_RTNL();
2496
2497 psin = (struct sockaddr_in *)&gsf->gf_group;
2498 if (psin->sin_family != AF_INET)
2499 return -EINVAL;
2500 addr = psin->sin_addr.s_addr;
2501 if (!ipv4_is_multicast(addr))
2502 return -EINVAL;
2503
2504 err = -EADDRNOTAVAIL;
2505
2506 for_each_pmc_rtnl(inet, pmc) {
2507 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2508 pmc->multi.imr_ifindex == gsf->gf_interface)
2509 break;
2510 }
2511 if (!pmc) /* must have a prior join */
2512 goto done;
2513 gsf->gf_fmode = pmc->sfmode;
2514 psl = rtnl_dereference(pmc->sflist);
2515 count = psl ? psl->sl_count : 0;
2516 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2517 gsf->gf_numsrc = count;
2518 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2519 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2520 return -EFAULT;
2521 }
2522 for (i = 0; i < copycount; i++) {
2523 struct sockaddr_storage ss;
2524
2525 psin = (struct sockaddr_in *)&ss;
2526 memset(&ss, 0, sizeof(ss));
2527 psin->sin_family = AF_INET;
2528 psin->sin_addr.s_addr = psl->sl_addr[i];
2529 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2530 return -EFAULT;
2531 }
2532 return 0;
2533 done:
2534 return err;
2535 }
2536
2537 /*
2538 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2539 */
2540 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2541 {
2542 struct inet_sock *inet = inet_sk(sk);
2543 struct ip_mc_socklist *pmc;
2544 struct ip_sf_socklist *psl;
2545 int i;
2546 int ret;
2547
2548 ret = 1;
2549 if (!ipv4_is_multicast(loc_addr))
2550 goto out;
2551
2552 rcu_read_lock();
2553 for_each_pmc_rcu(inet, pmc) {
2554 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2555 pmc->multi.imr_ifindex == dif)
2556 break;
2557 }
2558 ret = inet->mc_all;
2559 if (!pmc)
2560 goto unlock;
2561 psl = rcu_dereference(pmc->sflist);
2562 ret = (pmc->sfmode == MCAST_EXCLUDE);
2563 if (!psl)
2564 goto unlock;
2565
2566 for (i = 0; i < psl->sl_count; i++) {
2567 if (psl->sl_addr[i] == rmt_addr)
2568 break;
2569 }
2570 ret = 0;
2571 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2572 goto unlock;
2573 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2574 goto unlock;
2575 ret = 1;
2576 unlock:
2577 rcu_read_unlock();
2578 out:
2579 return ret;
2580 }
2581
2582 /*
2583 * A socket is closing.
2584 */
2585
2586 void ip_mc_drop_socket(struct sock *sk)
2587 {
2588 struct inet_sock *inet = inet_sk(sk);
2589 struct ip_mc_socklist *iml;
2590 struct net *net = sock_net(sk);
2591
2592 if (!inet->mc_list)
2593 return;
2594
2595 rtnl_lock();
2596 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2597 struct in_device *in_dev;
2598
2599 inet->mc_list = iml->next_rcu;
2600 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2601 (void) ip_mc_leave_src(sk, iml, in_dev);
2602 if (in_dev)
2603 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2604 /* decrease mem now to avoid the memleak warning */
2605 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2606 kfree_rcu(iml, rcu);
2607 }
2608 rtnl_unlock();
2609 }
2610
2611 /* called with rcu_read_lock() */
2612 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2613 {
2614 struct ip_mc_list *im;
2615 struct ip_mc_list __rcu **mc_hash;
2616 struct ip_sf_list *psf;
2617 int rv = 0;
2618
2619 mc_hash = rcu_dereference(in_dev->mc_hash);
2620 if (mc_hash) {
2621 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2622
2623 for (im = rcu_dereference(mc_hash[hash]);
2624 im != NULL;
2625 im = rcu_dereference(im->next_hash)) {
2626 if (im->multiaddr == mc_addr)
2627 break;
2628 }
2629 } else {
2630 for_each_pmc_rcu(in_dev, im) {
2631 if (im->multiaddr == mc_addr)
2632 break;
2633 }
2634 }
2635 if (im && proto == IPPROTO_IGMP) {
2636 rv = 1;
2637 } else if (im) {
2638 if (src_addr) {
2639 for (psf = im->sources; psf; psf = psf->sf_next) {
2640 if (psf->sf_inaddr == src_addr)
2641 break;
2642 }
2643 if (psf)
2644 rv = psf->sf_count[MCAST_INCLUDE] ||
2645 psf->sf_count[MCAST_EXCLUDE] !=
2646 im->sfcount[MCAST_EXCLUDE];
2647 else
2648 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2649 } else
2650 rv = 1; /* unspecified source; tentatively allow */
2651 }
2652 return rv;
2653 }
2654
2655 #if defined(CONFIG_PROC_FS)
2656 struct igmp_mc_iter_state {
2657 struct seq_net_private p;
2658 struct net_device *dev;
2659 struct in_device *in_dev;
2660 };
2661
2662 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2663
2664 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2665 {
2666 struct net *net = seq_file_net(seq);
2667 struct ip_mc_list *im = NULL;
2668 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2669
2670 state->in_dev = NULL;
2671 for_each_netdev_rcu(net, state->dev) {
2672 struct in_device *in_dev;
2673
2674 in_dev = __in_dev_get_rcu(state->dev);
2675 if (!in_dev)
2676 continue;
2677 im = rcu_dereference(in_dev->mc_list);
2678 if (im) {
2679 state->in_dev = in_dev;
2680 break;
2681 }
2682 }
2683 return im;
2684 }
2685
2686 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2687 {
2688 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2689
2690 im = rcu_dereference(im->next_rcu);
2691 while (!im) {
2692 state->dev = next_net_device_rcu(state->dev);
2693 if (!state->dev) {
2694 state->in_dev = NULL;
2695 break;
2696 }
2697 state->in_dev = __in_dev_get_rcu(state->dev);
2698 if (!state->in_dev)
2699 continue;
2700 im = rcu_dereference(state->in_dev->mc_list);
2701 }
2702 return im;
2703 }
2704
2705 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2706 {
2707 struct ip_mc_list *im = igmp_mc_get_first(seq);
2708 if (im)
2709 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2710 --pos;
2711 return pos ? NULL : im;
2712 }
2713
2714 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2715 __acquires(rcu)
2716 {
2717 rcu_read_lock();
2718 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2719 }
2720
2721 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2722 {
2723 struct ip_mc_list *im;
2724 if (v == SEQ_START_TOKEN)
2725 im = igmp_mc_get_first(seq);
2726 else
2727 im = igmp_mc_get_next(seq, v);
2728 ++*pos;
2729 return im;
2730 }
2731
2732 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2733 __releases(rcu)
2734 {
2735 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2736
2737 state->in_dev = NULL;
2738 state->dev = NULL;
2739 rcu_read_unlock();
2740 }
2741
2742 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2743 {
2744 if (v == SEQ_START_TOKEN)
2745 seq_puts(seq,
2746 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2747 else {
2748 struct ip_mc_list *im = (struct ip_mc_list *)v;
2749 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2750 char *querier;
2751 long delta;
2752
2753 #ifdef CONFIG_IP_MULTICAST
2754 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2755 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2756 "V3";
2757 #else
2758 querier = "NONE";
2759 #endif
2760
2761 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2762 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2763 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2764 }
2765
2766 delta = im->timer.expires - jiffies;
2767 seq_printf(seq,
2768 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2769 im->multiaddr, im->users,
2770 im->tm_running,
2771 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2772 im->reporter);
2773 }
2774 return 0;
2775 }
2776
2777 static const struct seq_operations igmp_mc_seq_ops = {
2778 .start = igmp_mc_seq_start,
2779 .next = igmp_mc_seq_next,
2780 .stop = igmp_mc_seq_stop,
2781 .show = igmp_mc_seq_show,
2782 };
2783
2784 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2785 {
2786 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2787 sizeof(struct igmp_mc_iter_state));
2788 }
2789
2790 static const struct file_operations igmp_mc_seq_fops = {
2791 .owner = THIS_MODULE,
2792 .open = igmp_mc_seq_open,
2793 .read = seq_read,
2794 .llseek = seq_lseek,
2795 .release = seq_release_net,
2796 };
2797
2798 struct igmp_mcf_iter_state {
2799 struct seq_net_private p;
2800 struct net_device *dev;
2801 struct in_device *idev;
2802 struct ip_mc_list *im;
2803 };
2804
2805 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2806
2807 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2808 {
2809 struct net *net = seq_file_net(seq);
2810 struct ip_sf_list *psf = NULL;
2811 struct ip_mc_list *im = NULL;
2812 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2813
2814 state->idev = NULL;
2815 state->im = NULL;
2816 for_each_netdev_rcu(net, state->dev) {
2817 struct in_device *idev;
2818 idev = __in_dev_get_rcu(state->dev);
2819 if (unlikely(!idev))
2820 continue;
2821 im = rcu_dereference(idev->mc_list);
2822 if (likely(im)) {
2823 spin_lock_bh(&im->lock);
2824 psf = im->sources;
2825 if (likely(psf)) {
2826 state->im = im;
2827 state->idev = idev;
2828 break;
2829 }
2830 spin_unlock_bh(&im->lock);
2831 }
2832 }
2833 return psf;
2834 }
2835
2836 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2837 {
2838 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2839
2840 psf = psf->sf_next;
2841 while (!psf) {
2842 spin_unlock_bh(&state->im->lock);
2843 state->im = state->im->next;
2844 while (!state->im) {
2845 state->dev = next_net_device_rcu(state->dev);
2846 if (!state->dev) {
2847 state->idev = NULL;
2848 goto out;
2849 }
2850 state->idev = __in_dev_get_rcu(state->dev);
2851 if (!state->idev)
2852 continue;
2853 state->im = rcu_dereference(state->idev->mc_list);
2854 }
2855 if (!state->im)
2856 break;
2857 spin_lock_bh(&state->im->lock);
2858 psf = state->im->sources;
2859 }
2860 out:
2861 return psf;
2862 }
2863
2864 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2865 {
2866 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2867 if (psf)
2868 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2869 --pos;
2870 return pos ? NULL : psf;
2871 }
2872
2873 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2874 __acquires(rcu)
2875 {
2876 rcu_read_lock();
2877 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2878 }
2879
2880 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2881 {
2882 struct ip_sf_list *psf;
2883 if (v == SEQ_START_TOKEN)
2884 psf = igmp_mcf_get_first(seq);
2885 else
2886 psf = igmp_mcf_get_next(seq, v);
2887 ++*pos;
2888 return psf;
2889 }
2890
2891 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2892 __releases(rcu)
2893 {
2894 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2895 if (likely(state->im)) {
2896 spin_unlock_bh(&state->im->lock);
2897 state->im = NULL;
2898 }
2899 state->idev = NULL;
2900 state->dev = NULL;
2901 rcu_read_unlock();
2902 }
2903
2904 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2905 {
2906 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2907 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2908
2909 if (v == SEQ_START_TOKEN) {
2910 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2911 } else {
2912 seq_printf(seq,
2913 "%3d %6.6s 0x%08x "
2914 "0x%08x %6lu %6lu\n",
2915 state->dev->ifindex, state->dev->name,
2916 ntohl(state->im->multiaddr),
2917 ntohl(psf->sf_inaddr),
2918 psf->sf_count[MCAST_INCLUDE],
2919 psf->sf_count[MCAST_EXCLUDE]);
2920 }
2921 return 0;
2922 }
2923
2924 static const struct seq_operations igmp_mcf_seq_ops = {
2925 .start = igmp_mcf_seq_start,
2926 .next = igmp_mcf_seq_next,
2927 .stop = igmp_mcf_seq_stop,
2928 .show = igmp_mcf_seq_show,
2929 };
2930
2931 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2932 {
2933 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2934 sizeof(struct igmp_mcf_iter_state));
2935 }
2936
2937 static const struct file_operations igmp_mcf_seq_fops = {
2938 .owner = THIS_MODULE,
2939 .open = igmp_mcf_seq_open,
2940 .read = seq_read,
2941 .llseek = seq_lseek,
2942 .release = seq_release_net,
2943 };
2944
2945 static int __net_init igmp_net_init(struct net *net)
2946 {
2947 struct proc_dir_entry *pde;
2948 int err;
2949
2950 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2951 if (!pde)
2952 goto out_igmp;
2953 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2954 &igmp_mcf_seq_fops);
2955 if (!pde)
2956 goto out_mcfilter;
2957 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2958 SOCK_DGRAM, 0, net);
2959 if (err < 0) {
2960 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2961 err);
2962 goto out_sock;
2963 }
2964
2965 /* Sysctl initialization */
2966 net->ipv4.sysctl_igmp_max_memberships = 20;
2967 net->ipv4.sysctl_igmp_max_msf = 10;
2968 /* IGMP reports for link-local multicast groups are enabled by default */
2969 net->ipv4.sysctl_igmp_llm_reports = 1;
2970 net->ipv4.sysctl_igmp_qrv = 2;
2971 return 0;
2972
2973 out_sock:
2974 remove_proc_entry("mcfilter", net->proc_net);
2975 out_mcfilter:
2976 remove_proc_entry("igmp", net->proc_net);
2977 out_igmp:
2978 return -ENOMEM;
2979 }
2980
2981 static void __net_exit igmp_net_exit(struct net *net)
2982 {
2983 remove_proc_entry("mcfilter", net->proc_net);
2984 remove_proc_entry("igmp", net->proc_net);
2985 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2986 }
2987
2988 static struct pernet_operations igmp_net_ops = {
2989 .init = igmp_net_init,
2990 .exit = igmp_net_exit,
2991 };
2992 #endif
2993
2994 static int igmp_netdev_event(struct notifier_block *this,
2995 unsigned long event, void *ptr)
2996 {
2997 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2998 struct in_device *in_dev;
2999
3000 switch (event) {
3001 case NETDEV_RESEND_IGMP:
3002 in_dev = __in_dev_get_rtnl(dev);
3003 if (in_dev)
3004 ip_mc_rejoin_groups(in_dev);
3005 break;
3006 default:
3007 break;
3008 }
3009 return NOTIFY_DONE;
3010 }
3011
3012 static struct notifier_block igmp_notifier = {
3013 .notifier_call = igmp_netdev_event,
3014 };
3015
3016 int __init igmp_mc_init(void)
3017 {
3018 #if defined(CONFIG_PROC_FS)
3019 int err;
3020
3021 err = register_pernet_subsys(&igmp_net_ops);
3022 if (err)
3023 return err;
3024 err = register_netdevice_notifier(&igmp_notifier);
3025 if (err)
3026 goto reg_notif_fail;
3027 return 0;
3028
3029 reg_notif_fail:
3030 unregister_pernet_subsys(&igmp_net_ops);
3031 return err;
3032 #else
3033 return register_netdevice_notifier(&igmp_notifier);
3034 #endif
3035 }
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