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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 #include <linux/byteorder/generic.h>
93
94 #include <net/net_namespace.h>
95 #include <net/arp.h>
96 #include <net/ip.h>
97 #include <net/protocol.h>
98 #include <net/route.h>
99 #include <net/sock.h>
100 #include <net/checksum.h>
101 #include <net/inet_common.h>
102 #include <linux/netfilter_ipv4.h>
103 #ifdef CONFIG_IP_MROUTE
104 #include <linux/mroute.h>
105 #endif
106 #ifdef CONFIG_PROC_FS
107 #include <linux/proc_fs.h>
108 #include <linux/seq_file.h>
109 #endif
110
111 #ifdef CONFIG_IP_MULTICAST
112 /* Parameter names and values are taken from igmp-v2-06 draft */
113
114 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
115 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
116 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
117 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
118 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
119 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
120
121
122 #define IGMP_INITIAL_REPORT_DELAY (1)
123
124 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
125 * IGMP specs require to report membership immediately after
126 * joining a group, but we delay the first report by a
127 * small interval. It seems more natural and still does not
128 * contradict to specs provided this delay is small enough.
129 */
130
131 #define IGMP_V1_SEEN(in_dev) \
132 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
134 ((in_dev)->mr_v1_seen && \
135 time_before(jiffies, (in_dev)->mr_v1_seen)))
136 #define IGMP_V2_SEEN(in_dev) \
137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
139 ((in_dev)->mr_v2_seen && \
140 time_before(jiffies, (in_dev)->mr_v2_seen)))
141
142 static int unsolicited_report_interval(struct in_device *in_dev)
143 {
144 int interval_ms, interval_jiffies;
145
146 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
147 interval_ms = IN_DEV_CONF_GET(
148 in_dev,
149 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
150 else /* v3 */
151 interval_ms = IN_DEV_CONF_GET(
152 in_dev,
153 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
154
155 interval_jiffies = msecs_to_jiffies(interval_ms);
156
157 /* _timer functions can't handle a delay of 0 jiffies so ensure
158 * we always return a positive value.
159 */
160 if (interval_jiffies <= 0)
161 interval_jiffies = 1;
162 return interval_jiffies;
163 }
164
165 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
166 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
167 static void igmpv3_clear_delrec(struct in_device *in_dev);
168 static int sf_setstate(struct ip_mc_list *pmc);
169 static void sf_markstate(struct ip_mc_list *pmc);
170 #endif
171 static void ip_mc_clear_src(struct ip_mc_list *pmc);
172 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
173 int sfcount, __be32 *psfsrc, int delta);
174
175 static void ip_ma_put(struct ip_mc_list *im)
176 {
177 if (refcount_dec_and_test(&im->refcnt)) {
178 in_dev_put(im->interface);
179 kfree_rcu(im, rcu);
180 }
181 }
182
183 #define for_each_pmc_rcu(in_dev, pmc) \
184 for (pmc = rcu_dereference(in_dev->mc_list); \
185 pmc != NULL; \
186 pmc = rcu_dereference(pmc->next_rcu))
187
188 #define for_each_pmc_rtnl(in_dev, pmc) \
189 for (pmc = rtnl_dereference(in_dev->mc_list); \
190 pmc != NULL; \
191 pmc = rtnl_dereference(pmc->next_rcu))
192
193 #ifdef CONFIG_IP_MULTICAST
194
195 /*
196 * Timer management
197 */
198
199 static void igmp_stop_timer(struct ip_mc_list *im)
200 {
201 spin_lock_bh(&im->lock);
202 if (del_timer(&im->timer))
203 refcount_dec(&im->refcnt);
204 im->tm_running = 0;
205 im->reporter = 0;
206 im->unsolicit_count = 0;
207 spin_unlock_bh(&im->lock);
208 }
209
210 /* It must be called with locked im->lock */
211 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
212 {
213 int tv = prandom_u32() % max_delay;
214
215 im->tm_running = 1;
216 if (!mod_timer(&im->timer, jiffies+tv+2))
217 refcount_inc(&im->refcnt);
218 }
219
220 static void igmp_gq_start_timer(struct in_device *in_dev)
221 {
222 int tv = prandom_u32() % in_dev->mr_maxdelay;
223 unsigned long exp = jiffies + tv + 2;
224
225 if (in_dev->mr_gq_running &&
226 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
227 return;
228
229 in_dev->mr_gq_running = 1;
230 if (!mod_timer(&in_dev->mr_gq_timer, exp))
231 in_dev_hold(in_dev);
232 }
233
234 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
235 {
236 int tv = prandom_u32() % delay;
237
238 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
239 in_dev_hold(in_dev);
240 }
241
242 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
243 {
244 spin_lock_bh(&im->lock);
245 im->unsolicit_count = 0;
246 if (del_timer(&im->timer)) {
247 if ((long)(im->timer.expires-jiffies) < max_delay) {
248 add_timer(&im->timer);
249 im->tm_running = 1;
250 spin_unlock_bh(&im->lock);
251 return;
252 }
253 refcount_dec(&im->refcnt);
254 }
255 igmp_start_timer(im, max_delay);
256 spin_unlock_bh(&im->lock);
257 }
258
259
260 /*
261 * Send an IGMP report.
262 */
263
264 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
265
266
267 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
268 int gdeleted, int sdeleted)
269 {
270 switch (type) {
271 case IGMPV3_MODE_IS_INCLUDE:
272 case IGMPV3_MODE_IS_EXCLUDE:
273 if (gdeleted || sdeleted)
274 return 0;
275 if (!(pmc->gsquery && !psf->sf_gsresp)) {
276 if (pmc->sfmode == MCAST_INCLUDE)
277 return 1;
278 /* don't include if this source is excluded
279 * in all filters
280 */
281 if (psf->sf_count[MCAST_INCLUDE])
282 return type == IGMPV3_MODE_IS_INCLUDE;
283 return pmc->sfcount[MCAST_EXCLUDE] ==
284 psf->sf_count[MCAST_EXCLUDE];
285 }
286 return 0;
287 case IGMPV3_CHANGE_TO_INCLUDE:
288 if (gdeleted || sdeleted)
289 return 0;
290 return psf->sf_count[MCAST_INCLUDE] != 0;
291 case IGMPV3_CHANGE_TO_EXCLUDE:
292 if (gdeleted || sdeleted)
293 return 0;
294 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
295 psf->sf_count[MCAST_INCLUDE])
296 return 0;
297 return pmc->sfcount[MCAST_EXCLUDE] ==
298 psf->sf_count[MCAST_EXCLUDE];
299 case IGMPV3_ALLOW_NEW_SOURCES:
300 if (gdeleted || !psf->sf_crcount)
301 return 0;
302 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
303 case IGMPV3_BLOCK_OLD_SOURCES:
304 if (pmc->sfmode == MCAST_INCLUDE)
305 return gdeleted || (psf->sf_crcount && sdeleted);
306 return psf->sf_crcount && !gdeleted && !sdeleted;
307 }
308 return 0;
309 }
310
311 static int
312 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
313 {
314 struct ip_sf_list *psf;
315 int scount = 0;
316
317 for (psf = pmc->sources; psf; psf = psf->sf_next) {
318 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
319 continue;
320 scount++;
321 }
322 return scount;
323 }
324
325 /* source address selection per RFC 3376 section 4.2.13 */
326 static __be32 igmpv3_get_srcaddr(struct net_device *dev,
327 const struct flowi4 *fl4)
328 {
329 struct in_device *in_dev = __in_dev_get_rcu(dev);
330
331 if (!in_dev)
332 return htonl(INADDR_ANY);
333
334 for_ifa(in_dev) {
335 if (fl4->saddr == ifa->ifa_local)
336 return fl4->saddr;
337 } endfor_ifa(in_dev);
338
339 return htonl(INADDR_ANY);
340 }
341
342 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
343 {
344 struct sk_buff *skb;
345 struct rtable *rt;
346 struct iphdr *pip;
347 struct igmpv3_report *pig;
348 struct net *net = dev_net(dev);
349 struct flowi4 fl4;
350 int hlen = LL_RESERVED_SPACE(dev);
351 int tlen = dev->needed_tailroom;
352 unsigned int size = mtu;
353
354 while (1) {
355 skb = alloc_skb(size + hlen + tlen,
356 GFP_ATOMIC | __GFP_NOWARN);
357 if (skb)
358 break;
359 size >>= 1;
360 if (size < 256)
361 return NULL;
362 }
363 skb->priority = TC_PRIO_CONTROL;
364
365 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
366 0, 0,
367 IPPROTO_IGMP, 0, dev->ifindex);
368 if (IS_ERR(rt)) {
369 kfree_skb(skb);
370 return NULL;
371 }
372
373 skb_dst_set(skb, &rt->dst);
374 skb->dev = dev;
375
376 skb_reserve(skb, hlen);
377 skb_tailroom_reserve(skb, mtu, tlen);
378
379 skb_reset_network_header(skb);
380 pip = ip_hdr(skb);
381 skb_put(skb, sizeof(struct iphdr) + 4);
382
383 pip->version = 4;
384 pip->ihl = (sizeof(struct iphdr)+4)>>2;
385 pip->tos = 0xc0;
386 pip->frag_off = htons(IP_DF);
387 pip->ttl = 1;
388 pip->daddr = fl4.daddr;
389
390 rcu_read_lock();
391 pip->saddr = igmpv3_get_srcaddr(dev, &fl4);
392 rcu_read_unlock();
393
394 pip->protocol = IPPROTO_IGMP;
395 pip->tot_len = 0; /* filled in later */
396 ip_select_ident(net, skb, NULL);
397 ((u8 *)&pip[1])[0] = IPOPT_RA;
398 ((u8 *)&pip[1])[1] = 4;
399 ((u8 *)&pip[1])[2] = 0;
400 ((u8 *)&pip[1])[3] = 0;
401
402 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
403 skb_put(skb, sizeof(*pig));
404 pig = igmpv3_report_hdr(skb);
405 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
406 pig->resv1 = 0;
407 pig->csum = 0;
408 pig->resv2 = 0;
409 pig->ngrec = 0;
410 return skb;
411 }
412
413 static int igmpv3_sendpack(struct sk_buff *skb)
414 {
415 struct igmphdr *pig = igmp_hdr(skb);
416 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
417
418 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
419
420 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
421 }
422
423 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
424 {
425 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
426 }
427
428 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
429 int type, struct igmpv3_grec **ppgr, unsigned int mtu)
430 {
431 struct net_device *dev = pmc->interface->dev;
432 struct igmpv3_report *pih;
433 struct igmpv3_grec *pgr;
434
435 if (!skb) {
436 skb = igmpv3_newpack(dev, mtu);
437 if (!skb)
438 return NULL;
439 }
440 pgr = skb_put(skb, sizeof(struct igmpv3_grec));
441 pgr->grec_type = type;
442 pgr->grec_auxwords = 0;
443 pgr->grec_nsrcs = 0;
444 pgr->grec_mca = pmc->multiaddr;
445 pih = igmpv3_report_hdr(skb);
446 pih->ngrec = htons(ntohs(pih->ngrec)+1);
447 *ppgr = pgr;
448 return skb;
449 }
450
451 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
452
453 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
454 int type, int gdeleted, int sdeleted)
455 {
456 struct net_device *dev = pmc->interface->dev;
457 struct net *net = dev_net(dev);
458 struct igmpv3_report *pih;
459 struct igmpv3_grec *pgr = NULL;
460 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
461 int scount, stotal, first, isquery, truncate;
462 unsigned int mtu;
463
464 if (pmc->multiaddr == IGMP_ALL_HOSTS)
465 return skb;
466 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
467 return skb;
468
469 mtu = READ_ONCE(dev->mtu);
470 if (mtu < IPV4_MIN_MTU)
471 return skb;
472
473 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
474 type == IGMPV3_MODE_IS_EXCLUDE;
475 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
476 type == IGMPV3_CHANGE_TO_EXCLUDE;
477
478 stotal = scount = 0;
479
480 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
481
482 if (!*psf_list)
483 goto empty_source;
484
485 pih = skb ? igmpv3_report_hdr(skb) : NULL;
486
487 /* EX and TO_EX get a fresh packet, if needed */
488 if (truncate) {
489 if (pih && pih->ngrec &&
490 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
491 if (skb)
492 igmpv3_sendpack(skb);
493 skb = igmpv3_newpack(dev, mtu);
494 }
495 }
496 first = 1;
497 psf_prev = NULL;
498 for (psf = *psf_list; psf; psf = psf_next) {
499 __be32 *psrc;
500
501 psf_next = psf->sf_next;
502
503 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
504 psf_prev = psf;
505 continue;
506 }
507
508 /* Based on RFC3376 5.1. Should not send source-list change
509 * records when there is a filter mode change.
510 */
511 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
512 (!gdeleted && pmc->crcount)) &&
513 (type == IGMPV3_ALLOW_NEW_SOURCES ||
514 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
515 goto decrease_sf_crcount;
516
517 /* clear marks on query responses */
518 if (isquery)
519 psf->sf_gsresp = 0;
520
521 if (AVAILABLE(skb) < sizeof(__be32) +
522 first*sizeof(struct igmpv3_grec)) {
523 if (truncate && !first)
524 break; /* truncate these */
525 if (pgr)
526 pgr->grec_nsrcs = htons(scount);
527 if (skb)
528 igmpv3_sendpack(skb);
529 skb = igmpv3_newpack(dev, mtu);
530 first = 1;
531 scount = 0;
532 }
533 if (first) {
534 skb = add_grhead(skb, pmc, type, &pgr, mtu);
535 first = 0;
536 }
537 if (!skb)
538 return NULL;
539 psrc = skb_put(skb, sizeof(__be32));
540 *psrc = psf->sf_inaddr;
541 scount++; stotal++;
542 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
543 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
544 decrease_sf_crcount:
545 psf->sf_crcount--;
546 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
547 if (psf_prev)
548 psf_prev->sf_next = psf->sf_next;
549 else
550 *psf_list = psf->sf_next;
551 kfree(psf);
552 continue;
553 }
554 }
555 psf_prev = psf;
556 }
557
558 empty_source:
559 if (!stotal) {
560 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
561 type == IGMPV3_BLOCK_OLD_SOURCES)
562 return skb;
563 if (pmc->crcount || isquery) {
564 /* make sure we have room for group header */
565 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
566 igmpv3_sendpack(skb);
567 skb = NULL; /* add_grhead will get a new one */
568 }
569 skb = add_grhead(skb, pmc, type, &pgr, mtu);
570 }
571 }
572 if (pgr)
573 pgr->grec_nsrcs = htons(scount);
574
575 if (isquery)
576 pmc->gsquery = 0; /* clear query state on report */
577 return skb;
578 }
579
580 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
581 {
582 struct sk_buff *skb = NULL;
583 struct net *net = dev_net(in_dev->dev);
584 int type;
585
586 if (!pmc) {
587 rcu_read_lock();
588 for_each_pmc_rcu(in_dev, pmc) {
589 if (pmc->multiaddr == IGMP_ALL_HOSTS)
590 continue;
591 if (ipv4_is_local_multicast(pmc->multiaddr) &&
592 !net->ipv4.sysctl_igmp_llm_reports)
593 continue;
594 spin_lock_bh(&pmc->lock);
595 if (pmc->sfcount[MCAST_EXCLUDE])
596 type = IGMPV3_MODE_IS_EXCLUDE;
597 else
598 type = IGMPV3_MODE_IS_INCLUDE;
599 skb = add_grec(skb, pmc, type, 0, 0);
600 spin_unlock_bh(&pmc->lock);
601 }
602 rcu_read_unlock();
603 } else {
604 spin_lock_bh(&pmc->lock);
605 if (pmc->sfcount[MCAST_EXCLUDE])
606 type = IGMPV3_MODE_IS_EXCLUDE;
607 else
608 type = IGMPV3_MODE_IS_INCLUDE;
609 skb = add_grec(skb, pmc, type, 0, 0);
610 spin_unlock_bh(&pmc->lock);
611 }
612 if (!skb)
613 return 0;
614 return igmpv3_sendpack(skb);
615 }
616
617 /*
618 * remove zero-count source records from a source filter list
619 */
620 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
621 {
622 struct ip_sf_list *psf_prev, *psf_next, *psf;
623
624 psf_prev = NULL;
625 for (psf = *ppsf; psf; psf = psf_next) {
626 psf_next = psf->sf_next;
627 if (psf->sf_crcount == 0) {
628 if (psf_prev)
629 psf_prev->sf_next = psf->sf_next;
630 else
631 *ppsf = psf->sf_next;
632 kfree(psf);
633 } else
634 psf_prev = psf;
635 }
636 }
637
638 static void igmpv3_send_cr(struct in_device *in_dev)
639 {
640 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
641 struct sk_buff *skb = NULL;
642 int type, dtype;
643
644 rcu_read_lock();
645 spin_lock_bh(&in_dev->mc_tomb_lock);
646
647 /* deleted MCA's */
648 pmc_prev = NULL;
649 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
650 pmc_next = pmc->next;
651 if (pmc->sfmode == MCAST_INCLUDE) {
652 type = IGMPV3_BLOCK_OLD_SOURCES;
653 dtype = IGMPV3_BLOCK_OLD_SOURCES;
654 skb = add_grec(skb, pmc, type, 1, 0);
655 skb = add_grec(skb, pmc, dtype, 1, 1);
656 }
657 if (pmc->crcount) {
658 if (pmc->sfmode == MCAST_EXCLUDE) {
659 type = IGMPV3_CHANGE_TO_INCLUDE;
660 skb = add_grec(skb, pmc, type, 1, 0);
661 }
662 pmc->crcount--;
663 if (pmc->crcount == 0) {
664 igmpv3_clear_zeros(&pmc->tomb);
665 igmpv3_clear_zeros(&pmc->sources);
666 }
667 }
668 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
669 if (pmc_prev)
670 pmc_prev->next = pmc_next;
671 else
672 in_dev->mc_tomb = pmc_next;
673 in_dev_put(pmc->interface);
674 kfree(pmc);
675 } else
676 pmc_prev = pmc;
677 }
678 spin_unlock_bh(&in_dev->mc_tomb_lock);
679
680 /* change recs */
681 for_each_pmc_rcu(in_dev, pmc) {
682 spin_lock_bh(&pmc->lock);
683 if (pmc->sfcount[MCAST_EXCLUDE]) {
684 type = IGMPV3_BLOCK_OLD_SOURCES;
685 dtype = IGMPV3_ALLOW_NEW_SOURCES;
686 } else {
687 type = IGMPV3_ALLOW_NEW_SOURCES;
688 dtype = IGMPV3_BLOCK_OLD_SOURCES;
689 }
690 skb = add_grec(skb, pmc, type, 0, 0);
691 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
692
693 /* filter mode changes */
694 if (pmc->crcount) {
695 if (pmc->sfmode == MCAST_EXCLUDE)
696 type = IGMPV3_CHANGE_TO_EXCLUDE;
697 else
698 type = IGMPV3_CHANGE_TO_INCLUDE;
699 skb = add_grec(skb, pmc, type, 0, 0);
700 pmc->crcount--;
701 }
702 spin_unlock_bh(&pmc->lock);
703 }
704 rcu_read_unlock();
705
706 if (!skb)
707 return;
708 (void) igmpv3_sendpack(skb);
709 }
710
711 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
712 int type)
713 {
714 struct sk_buff *skb;
715 struct iphdr *iph;
716 struct igmphdr *ih;
717 struct rtable *rt;
718 struct net_device *dev = in_dev->dev;
719 struct net *net = dev_net(dev);
720 __be32 group = pmc ? pmc->multiaddr : 0;
721 struct flowi4 fl4;
722 __be32 dst;
723 int hlen, tlen;
724
725 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
726 return igmpv3_send_report(in_dev, pmc);
727
728 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
729 return 0;
730
731 if (type == IGMP_HOST_LEAVE_MESSAGE)
732 dst = IGMP_ALL_ROUTER;
733 else
734 dst = group;
735
736 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
737 0, 0,
738 IPPROTO_IGMP, 0, dev->ifindex);
739 if (IS_ERR(rt))
740 return -1;
741
742 hlen = LL_RESERVED_SPACE(dev);
743 tlen = dev->needed_tailroom;
744 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
745 if (!skb) {
746 ip_rt_put(rt);
747 return -1;
748 }
749 skb->priority = TC_PRIO_CONTROL;
750
751 skb_dst_set(skb, &rt->dst);
752
753 skb_reserve(skb, hlen);
754
755 skb_reset_network_header(skb);
756 iph = ip_hdr(skb);
757 skb_put(skb, sizeof(struct iphdr) + 4);
758
759 iph->version = 4;
760 iph->ihl = (sizeof(struct iphdr)+4)>>2;
761 iph->tos = 0xc0;
762 iph->frag_off = htons(IP_DF);
763 iph->ttl = 1;
764 iph->daddr = dst;
765 iph->saddr = fl4.saddr;
766 iph->protocol = IPPROTO_IGMP;
767 ip_select_ident(net, skb, NULL);
768 ((u8 *)&iph[1])[0] = IPOPT_RA;
769 ((u8 *)&iph[1])[1] = 4;
770 ((u8 *)&iph[1])[2] = 0;
771 ((u8 *)&iph[1])[3] = 0;
772
773 ih = skb_put(skb, sizeof(struct igmphdr));
774 ih->type = type;
775 ih->code = 0;
776 ih->csum = 0;
777 ih->group = group;
778 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
779
780 return ip_local_out(net, skb->sk, skb);
781 }
782
783 static void igmp_gq_timer_expire(struct timer_list *t)
784 {
785 struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer);
786
787 in_dev->mr_gq_running = 0;
788 igmpv3_send_report(in_dev, NULL);
789 in_dev_put(in_dev);
790 }
791
792 static void igmp_ifc_timer_expire(struct timer_list *t)
793 {
794 struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer);
795
796 igmpv3_send_cr(in_dev);
797 if (in_dev->mr_ifc_count) {
798 in_dev->mr_ifc_count--;
799 igmp_ifc_start_timer(in_dev,
800 unsolicited_report_interval(in_dev));
801 }
802 in_dev_put(in_dev);
803 }
804
805 static void igmp_ifc_event(struct in_device *in_dev)
806 {
807 struct net *net = dev_net(in_dev->dev);
808 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
809 return;
810 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
811 igmp_ifc_start_timer(in_dev, 1);
812 }
813
814
815 static void igmp_timer_expire(struct timer_list *t)
816 {
817 struct ip_mc_list *im = from_timer(im, t, timer);
818 struct in_device *in_dev = im->interface;
819
820 spin_lock(&im->lock);
821 im->tm_running = 0;
822
823 if (im->unsolicit_count) {
824 im->unsolicit_count--;
825 igmp_start_timer(im, unsolicited_report_interval(in_dev));
826 }
827 im->reporter = 1;
828 spin_unlock(&im->lock);
829
830 if (IGMP_V1_SEEN(in_dev))
831 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
832 else if (IGMP_V2_SEEN(in_dev))
833 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
834 else
835 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
836
837 ip_ma_put(im);
838 }
839
840 /* mark EXCLUDE-mode sources */
841 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
842 {
843 struct ip_sf_list *psf;
844 int i, scount;
845
846 scount = 0;
847 for (psf = pmc->sources; psf; psf = psf->sf_next) {
848 if (scount == nsrcs)
849 break;
850 for (i = 0; i < nsrcs; i++) {
851 /* skip inactive filters */
852 if (psf->sf_count[MCAST_INCLUDE] ||
853 pmc->sfcount[MCAST_EXCLUDE] !=
854 psf->sf_count[MCAST_EXCLUDE])
855 break;
856 if (srcs[i] == psf->sf_inaddr) {
857 scount++;
858 break;
859 }
860 }
861 }
862 pmc->gsquery = 0;
863 if (scount == nsrcs) /* all sources excluded */
864 return 0;
865 return 1;
866 }
867
868 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
869 {
870 struct ip_sf_list *psf;
871 int i, scount;
872
873 if (pmc->sfmode == MCAST_EXCLUDE)
874 return igmp_xmarksources(pmc, nsrcs, srcs);
875
876 /* mark INCLUDE-mode sources */
877 scount = 0;
878 for (psf = pmc->sources; psf; psf = psf->sf_next) {
879 if (scount == nsrcs)
880 break;
881 for (i = 0; i < nsrcs; i++)
882 if (srcs[i] == psf->sf_inaddr) {
883 psf->sf_gsresp = 1;
884 scount++;
885 break;
886 }
887 }
888 if (!scount) {
889 pmc->gsquery = 0;
890 return 0;
891 }
892 pmc->gsquery = 1;
893 return 1;
894 }
895
896 /* return true if packet was dropped */
897 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
898 {
899 struct ip_mc_list *im;
900 struct net *net = dev_net(in_dev->dev);
901
902 /* Timers are only set for non-local groups */
903
904 if (group == IGMP_ALL_HOSTS)
905 return false;
906 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
907 return false;
908
909 rcu_read_lock();
910 for_each_pmc_rcu(in_dev, im) {
911 if (im->multiaddr == group) {
912 igmp_stop_timer(im);
913 break;
914 }
915 }
916 rcu_read_unlock();
917 return false;
918 }
919
920 /* return true if packet was dropped */
921 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
922 int len)
923 {
924 struct igmphdr *ih = igmp_hdr(skb);
925 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
926 struct ip_mc_list *im;
927 __be32 group = ih->group;
928 int max_delay;
929 int mark = 0;
930 struct net *net = dev_net(in_dev->dev);
931
932
933 if (len == 8) {
934 if (ih->code == 0) {
935 /* Alas, old v1 router presents here. */
936
937 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
938 in_dev->mr_v1_seen = jiffies +
939 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
940 group = 0;
941 } else {
942 /* v2 router present */
943 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
944 in_dev->mr_v2_seen = jiffies +
945 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
946 }
947 /* cancel the interface change timer */
948 in_dev->mr_ifc_count = 0;
949 if (del_timer(&in_dev->mr_ifc_timer))
950 __in_dev_put(in_dev);
951 /* clear deleted report items */
952 igmpv3_clear_delrec(in_dev);
953 } else if (len < 12) {
954 return true; /* ignore bogus packet; freed by caller */
955 } else if (IGMP_V1_SEEN(in_dev)) {
956 /* This is a v3 query with v1 queriers present */
957 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
958 group = 0;
959 } else if (IGMP_V2_SEEN(in_dev)) {
960 /* this is a v3 query with v2 queriers present;
961 * Interpretation of the max_delay code is problematic here.
962 * A real v2 host would use ih_code directly, while v3 has a
963 * different encoding. We use the v3 encoding as more likely
964 * to be intended in a v3 query.
965 */
966 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
967 if (!max_delay)
968 max_delay = 1; /* can't mod w/ 0 */
969 } else { /* v3 */
970 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
971 return true;
972
973 ih3 = igmpv3_query_hdr(skb);
974 if (ih3->nsrcs) {
975 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
976 + ntohs(ih3->nsrcs)*sizeof(__be32)))
977 return true;
978 ih3 = igmpv3_query_hdr(skb);
979 }
980
981 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
982 if (!max_delay)
983 max_delay = 1; /* can't mod w/ 0 */
984 in_dev->mr_maxdelay = max_delay;
985 if (ih3->qrv)
986 in_dev->mr_qrv = ih3->qrv;
987 if (!group) { /* general query */
988 if (ih3->nsrcs)
989 return true; /* no sources allowed */
990 igmp_gq_start_timer(in_dev);
991 return false;
992 }
993 /* mark sources to include, if group & source-specific */
994 mark = ih3->nsrcs != 0;
995 }
996
997 /*
998 * - Start the timers in all of our membership records
999 * that the query applies to for the interface on
1000 * which the query arrived excl. those that belong
1001 * to a "local" group (224.0.0.X)
1002 * - For timers already running check if they need to
1003 * be reset.
1004 * - Use the igmp->igmp_code field as the maximum
1005 * delay possible
1006 */
1007 rcu_read_lock();
1008 for_each_pmc_rcu(in_dev, im) {
1009 int changed;
1010
1011 if (group && group != im->multiaddr)
1012 continue;
1013 if (im->multiaddr == IGMP_ALL_HOSTS)
1014 continue;
1015 if (ipv4_is_local_multicast(im->multiaddr) &&
1016 !net->ipv4.sysctl_igmp_llm_reports)
1017 continue;
1018 spin_lock_bh(&im->lock);
1019 if (im->tm_running)
1020 im->gsquery = im->gsquery && mark;
1021 else
1022 im->gsquery = mark;
1023 changed = !im->gsquery ||
1024 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1025 spin_unlock_bh(&im->lock);
1026 if (changed)
1027 igmp_mod_timer(im, max_delay);
1028 }
1029 rcu_read_unlock();
1030 return false;
1031 }
1032
1033 /* called in rcu_read_lock() section */
1034 int igmp_rcv(struct sk_buff *skb)
1035 {
1036 /* This basically follows the spec line by line -- see RFC1112 */
1037 struct igmphdr *ih;
1038 struct net_device *dev = skb->dev;
1039 struct in_device *in_dev;
1040 int len = skb->len;
1041 bool dropped = true;
1042
1043 if (netif_is_l3_master(dev)) {
1044 dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif);
1045 if (!dev)
1046 goto drop;
1047 }
1048
1049 in_dev = __in_dev_get_rcu(dev);
1050 if (!in_dev)
1051 goto drop;
1052
1053 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1054 goto drop;
1055
1056 if (skb_checksum_simple_validate(skb))
1057 goto drop;
1058
1059 ih = igmp_hdr(skb);
1060 switch (ih->type) {
1061 case IGMP_HOST_MEMBERSHIP_QUERY:
1062 dropped = igmp_heard_query(in_dev, skb, len);
1063 break;
1064 case IGMP_HOST_MEMBERSHIP_REPORT:
1065 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1066 /* Is it our report looped back? */
1067 if (rt_is_output_route(skb_rtable(skb)))
1068 break;
1069 /* don't rely on MC router hearing unicast reports */
1070 if (skb->pkt_type == PACKET_MULTICAST ||
1071 skb->pkt_type == PACKET_BROADCAST)
1072 dropped = igmp_heard_report(in_dev, ih->group);
1073 break;
1074 case IGMP_PIM:
1075 #ifdef CONFIG_IP_PIMSM_V1
1076 return pim_rcv_v1(skb);
1077 #endif
1078 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1079 case IGMP_DVMRP:
1080 case IGMP_TRACE:
1081 case IGMP_HOST_LEAVE_MESSAGE:
1082 case IGMP_MTRACE:
1083 case IGMP_MTRACE_RESP:
1084 break;
1085 default:
1086 break;
1087 }
1088
1089 drop:
1090 if (dropped)
1091 kfree_skb(skb);
1092 else
1093 consume_skb(skb);
1094 return 0;
1095 }
1096
1097 #endif
1098
1099
1100 /*
1101 * Add a filter to a device
1102 */
1103
1104 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1105 {
1106 char buf[MAX_ADDR_LEN];
1107 struct net_device *dev = in_dev->dev;
1108
1109 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1110 We will get multicast token leakage, when IFF_MULTICAST
1111 is changed. This check should be done in ndo_set_rx_mode
1112 routine. Something sort of:
1113 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1114 --ANK
1115 */
1116 if (arp_mc_map(addr, buf, dev, 0) == 0)
1117 dev_mc_add(dev, buf);
1118 }
1119
1120 /*
1121 * Remove a filter from a device
1122 */
1123
1124 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1125 {
1126 char buf[MAX_ADDR_LEN];
1127 struct net_device *dev = in_dev->dev;
1128
1129 if (arp_mc_map(addr, buf, dev, 0) == 0)
1130 dev_mc_del(dev, buf);
1131 }
1132
1133 #ifdef CONFIG_IP_MULTICAST
1134 /*
1135 * deleted ip_mc_list manipulation
1136 */
1137 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1138 {
1139 struct ip_mc_list *pmc;
1140 struct net *net = dev_net(in_dev->dev);
1141
1142 /* this is an "ip_mc_list" for convenience; only the fields below
1143 * are actually used. In particular, the refcnt and users are not
1144 * used for management of the delete list. Using the same structure
1145 * for deleted items allows change reports to use common code with
1146 * non-deleted or query-response MCA's.
1147 */
1148 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1149 if (!pmc)
1150 return;
1151 spin_lock_init(&pmc->lock);
1152 spin_lock_bh(&im->lock);
1153 pmc->interface = im->interface;
1154 in_dev_hold(in_dev);
1155 pmc->multiaddr = im->multiaddr;
1156 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1157 pmc->sfmode = im->sfmode;
1158 if (pmc->sfmode == MCAST_INCLUDE) {
1159 struct ip_sf_list *psf;
1160
1161 pmc->tomb = im->tomb;
1162 pmc->sources = im->sources;
1163 im->tomb = im->sources = NULL;
1164 for (psf = pmc->sources; psf; psf = psf->sf_next)
1165 psf->sf_crcount = pmc->crcount;
1166 }
1167 spin_unlock_bh(&im->lock);
1168
1169 spin_lock_bh(&in_dev->mc_tomb_lock);
1170 pmc->next = in_dev->mc_tomb;
1171 in_dev->mc_tomb = pmc;
1172 spin_unlock_bh(&in_dev->mc_tomb_lock);
1173 }
1174
1175 /*
1176 * restore ip_mc_list deleted records
1177 */
1178 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1179 {
1180 struct ip_mc_list *pmc, *pmc_prev;
1181 struct ip_sf_list *psf;
1182 struct net *net = dev_net(in_dev->dev);
1183 __be32 multiaddr = im->multiaddr;
1184
1185 spin_lock_bh(&in_dev->mc_tomb_lock);
1186 pmc_prev = NULL;
1187 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1188 if (pmc->multiaddr == multiaddr)
1189 break;
1190 pmc_prev = pmc;
1191 }
1192 if (pmc) {
1193 if (pmc_prev)
1194 pmc_prev->next = pmc->next;
1195 else
1196 in_dev->mc_tomb = pmc->next;
1197 }
1198 spin_unlock_bh(&in_dev->mc_tomb_lock);
1199
1200 spin_lock_bh(&im->lock);
1201 if (pmc) {
1202 im->interface = pmc->interface;
1203 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1204 im->sfmode = pmc->sfmode;
1205 if (pmc->sfmode == MCAST_INCLUDE) {
1206 im->tomb = pmc->tomb;
1207 im->sources = pmc->sources;
1208 for (psf = im->sources; psf; psf = psf->sf_next)
1209 psf->sf_crcount = im->crcount;
1210 }
1211 in_dev_put(pmc->interface);
1212 kfree(pmc);
1213 }
1214 spin_unlock_bh(&im->lock);
1215 }
1216
1217 /*
1218 * flush ip_mc_list deleted records
1219 */
1220 static void igmpv3_clear_delrec(struct in_device *in_dev)
1221 {
1222 struct ip_mc_list *pmc, *nextpmc;
1223
1224 spin_lock_bh(&in_dev->mc_tomb_lock);
1225 pmc = in_dev->mc_tomb;
1226 in_dev->mc_tomb = NULL;
1227 spin_unlock_bh(&in_dev->mc_tomb_lock);
1228
1229 for (; pmc; pmc = nextpmc) {
1230 nextpmc = pmc->next;
1231 ip_mc_clear_src(pmc);
1232 in_dev_put(pmc->interface);
1233 kfree(pmc);
1234 }
1235 /* clear dead sources, too */
1236 rcu_read_lock();
1237 for_each_pmc_rcu(in_dev, pmc) {
1238 struct ip_sf_list *psf, *psf_next;
1239
1240 spin_lock_bh(&pmc->lock);
1241 psf = pmc->tomb;
1242 pmc->tomb = NULL;
1243 spin_unlock_bh(&pmc->lock);
1244 for (; psf; psf = psf_next) {
1245 psf_next = psf->sf_next;
1246 kfree(psf);
1247 }
1248 }
1249 rcu_read_unlock();
1250 }
1251 #endif
1252
1253 static void igmp_group_dropped(struct ip_mc_list *im)
1254 {
1255 struct in_device *in_dev = im->interface;
1256 #ifdef CONFIG_IP_MULTICAST
1257 struct net *net = dev_net(in_dev->dev);
1258 int reporter;
1259 #endif
1260
1261 if (im->loaded) {
1262 im->loaded = 0;
1263 ip_mc_filter_del(in_dev, im->multiaddr);
1264 }
1265
1266 #ifdef CONFIG_IP_MULTICAST
1267 if (im->multiaddr == IGMP_ALL_HOSTS)
1268 return;
1269 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1270 return;
1271
1272 reporter = im->reporter;
1273 igmp_stop_timer(im);
1274
1275 if (!in_dev->dead) {
1276 if (IGMP_V1_SEEN(in_dev))
1277 return;
1278 if (IGMP_V2_SEEN(in_dev)) {
1279 if (reporter)
1280 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1281 return;
1282 }
1283 /* IGMPv3 */
1284 igmpv3_add_delrec(in_dev, im);
1285
1286 igmp_ifc_event(in_dev);
1287 }
1288 #endif
1289 }
1290
1291 static void igmp_group_added(struct ip_mc_list *im)
1292 {
1293 struct in_device *in_dev = im->interface;
1294 #ifdef CONFIG_IP_MULTICAST
1295 struct net *net = dev_net(in_dev->dev);
1296 #endif
1297
1298 if (im->loaded == 0) {
1299 im->loaded = 1;
1300 ip_mc_filter_add(in_dev, im->multiaddr);
1301 }
1302
1303 #ifdef CONFIG_IP_MULTICAST
1304 if (im->multiaddr == IGMP_ALL_HOSTS)
1305 return;
1306 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1307 return;
1308
1309 if (in_dev->dead)
1310 return;
1311 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1312 spin_lock_bh(&im->lock);
1313 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1314 spin_unlock_bh(&im->lock);
1315 return;
1316 }
1317 /* else, v3 */
1318
1319 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1320 igmp_ifc_event(in_dev);
1321 #endif
1322 }
1323
1324
1325 /*
1326 * Multicast list managers
1327 */
1328
1329 static u32 ip_mc_hash(const struct ip_mc_list *im)
1330 {
1331 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1332 }
1333
1334 static void ip_mc_hash_add(struct in_device *in_dev,
1335 struct ip_mc_list *im)
1336 {
1337 struct ip_mc_list __rcu **mc_hash;
1338 u32 hash;
1339
1340 mc_hash = rtnl_dereference(in_dev->mc_hash);
1341 if (mc_hash) {
1342 hash = ip_mc_hash(im);
1343 im->next_hash = mc_hash[hash];
1344 rcu_assign_pointer(mc_hash[hash], im);
1345 return;
1346 }
1347
1348 /* do not use a hash table for small number of items */
1349 if (in_dev->mc_count < 4)
1350 return;
1351
1352 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1353 GFP_KERNEL);
1354 if (!mc_hash)
1355 return;
1356
1357 for_each_pmc_rtnl(in_dev, im) {
1358 hash = ip_mc_hash(im);
1359 im->next_hash = mc_hash[hash];
1360 RCU_INIT_POINTER(mc_hash[hash], im);
1361 }
1362
1363 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1364 }
1365
1366 static void ip_mc_hash_remove(struct in_device *in_dev,
1367 struct ip_mc_list *im)
1368 {
1369 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1370 struct ip_mc_list *aux;
1371
1372 if (!mc_hash)
1373 return;
1374 mc_hash += ip_mc_hash(im);
1375 while ((aux = rtnl_dereference(*mc_hash)) != im)
1376 mc_hash = &aux->next_hash;
1377 *mc_hash = im->next_hash;
1378 }
1379
1380
1381 /*
1382 * A socket has joined a multicast group on device dev.
1383 */
1384
1385 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1386 {
1387 struct ip_mc_list *im;
1388 #ifdef CONFIG_IP_MULTICAST
1389 struct net *net = dev_net(in_dev->dev);
1390 #endif
1391
1392 ASSERT_RTNL();
1393
1394 for_each_pmc_rtnl(in_dev, im) {
1395 if (im->multiaddr == addr) {
1396 im->users++;
1397 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1398 goto out;
1399 }
1400 }
1401
1402 im = kzalloc(sizeof(*im), GFP_KERNEL);
1403 if (!im)
1404 goto out;
1405
1406 im->users = 1;
1407 im->interface = in_dev;
1408 in_dev_hold(in_dev);
1409 im->multiaddr = addr;
1410 /* initial mode is (EX, empty) */
1411 im->sfmode = MCAST_EXCLUDE;
1412 im->sfcount[MCAST_EXCLUDE] = 1;
1413 refcount_set(&im->refcnt, 1);
1414 spin_lock_init(&im->lock);
1415 #ifdef CONFIG_IP_MULTICAST
1416 timer_setup(&im->timer, igmp_timer_expire, 0);
1417 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1418 #endif
1419
1420 im->next_rcu = in_dev->mc_list;
1421 in_dev->mc_count++;
1422 rcu_assign_pointer(in_dev->mc_list, im);
1423
1424 ip_mc_hash_add(in_dev, im);
1425
1426 #ifdef CONFIG_IP_MULTICAST
1427 igmpv3_del_delrec(in_dev, im);
1428 #endif
1429 igmp_group_added(im);
1430 if (!in_dev->dead)
1431 ip_rt_multicast_event(in_dev);
1432 out:
1433 return;
1434 }
1435 EXPORT_SYMBOL(ip_mc_inc_group);
1436
1437 static int ip_mc_check_iphdr(struct sk_buff *skb)
1438 {
1439 const struct iphdr *iph;
1440 unsigned int len;
1441 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1442
1443 if (!pskb_may_pull(skb, offset))
1444 return -EINVAL;
1445
1446 iph = ip_hdr(skb);
1447
1448 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1449 return -EINVAL;
1450
1451 offset += ip_hdrlen(skb) - sizeof(*iph);
1452
1453 if (!pskb_may_pull(skb, offset))
1454 return -EINVAL;
1455
1456 iph = ip_hdr(skb);
1457
1458 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1459 return -EINVAL;
1460
1461 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1462 if (skb->len < len || len < offset)
1463 return -EINVAL;
1464
1465 skb_set_transport_header(skb, offset);
1466
1467 return 0;
1468 }
1469
1470 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1471 {
1472 unsigned int len = skb_transport_offset(skb);
1473
1474 len += sizeof(struct igmpv3_report);
1475
1476 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1477 }
1478
1479 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1480 {
1481 unsigned int len = skb_transport_offset(skb);
1482
1483 len += sizeof(struct igmphdr);
1484 if (skb->len < len)
1485 return -EINVAL;
1486
1487 /* IGMPv{1,2}? */
1488 if (skb->len != len) {
1489 /* or IGMPv3? */
1490 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1491 if (skb->len < len || !pskb_may_pull(skb, len))
1492 return -EINVAL;
1493 }
1494
1495 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1496 * all-systems destination addresses (224.0.0.1) for general queries
1497 */
1498 if (!igmp_hdr(skb)->group &&
1499 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1500 return -EINVAL;
1501
1502 return 0;
1503 }
1504
1505 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1506 {
1507 switch (igmp_hdr(skb)->type) {
1508 case IGMP_HOST_LEAVE_MESSAGE:
1509 case IGMP_HOST_MEMBERSHIP_REPORT:
1510 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1511 /* fall through */
1512 return 0;
1513 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1514 return ip_mc_check_igmp_reportv3(skb);
1515 case IGMP_HOST_MEMBERSHIP_QUERY:
1516 return ip_mc_check_igmp_query(skb);
1517 default:
1518 return -ENOMSG;
1519 }
1520 }
1521
1522 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1523 {
1524 return skb_checksum_simple_validate(skb);
1525 }
1526
1527 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1528
1529 {
1530 struct sk_buff *skb_chk;
1531 unsigned int transport_len;
1532 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1533 int ret = -EINVAL;
1534
1535 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1536
1537 skb_chk = skb_checksum_trimmed(skb, transport_len,
1538 ip_mc_validate_checksum);
1539 if (!skb_chk)
1540 goto err;
1541
1542 if (!pskb_may_pull(skb_chk, len))
1543 goto err;
1544
1545 ret = ip_mc_check_igmp_msg(skb_chk);
1546 if (ret)
1547 goto err;
1548
1549 if (skb_trimmed)
1550 *skb_trimmed = skb_chk;
1551 /* free now unneeded clone */
1552 else if (skb_chk != skb)
1553 kfree_skb(skb_chk);
1554
1555 ret = 0;
1556
1557 err:
1558 if (ret && skb_chk && skb_chk != skb)
1559 kfree_skb(skb_chk);
1560
1561 return ret;
1562 }
1563
1564 /**
1565 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1566 * @skb: the skb to validate
1567 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1568 *
1569 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1570 * skb transport header accordingly and returns zero.
1571 *
1572 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1573 * standard
1574 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1575 * -ENOMEM: A memory allocation failure happened.
1576 *
1577 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1578 * to NULL): After parsing an IGMP packet successfully it will point to
1579 * an skb which has its tail aligned to the IP packet end. This might
1580 * either be the originally provided skb or a trimmed, cloned version if
1581 * the skb frame had data beyond the IP packet. A cloned skb allows us
1582 * to leave the original skb and its full frame unchanged (which might be
1583 * desirable for layer 2 frame jugglers).
1584 *
1585 * Caller needs to set the skb network header and free any returned skb if it
1586 * differs from the provided skb.
1587 */
1588 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1589 {
1590 int ret = ip_mc_check_iphdr(skb);
1591
1592 if (ret < 0)
1593 return ret;
1594
1595 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1596 return -ENOMSG;
1597
1598 return __ip_mc_check_igmp(skb, skb_trimmed);
1599 }
1600 EXPORT_SYMBOL(ip_mc_check_igmp);
1601
1602 /*
1603 * Resend IGMP JOIN report; used by netdev notifier.
1604 */
1605 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1606 {
1607 #ifdef CONFIG_IP_MULTICAST
1608 struct ip_mc_list *im;
1609 int type;
1610 struct net *net = dev_net(in_dev->dev);
1611
1612 ASSERT_RTNL();
1613
1614 for_each_pmc_rtnl(in_dev, im) {
1615 if (im->multiaddr == IGMP_ALL_HOSTS)
1616 continue;
1617 if (ipv4_is_local_multicast(im->multiaddr) &&
1618 !net->ipv4.sysctl_igmp_llm_reports)
1619 continue;
1620
1621 /* a failover is happening and switches
1622 * must be notified immediately
1623 */
1624 if (IGMP_V1_SEEN(in_dev))
1625 type = IGMP_HOST_MEMBERSHIP_REPORT;
1626 else if (IGMP_V2_SEEN(in_dev))
1627 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1628 else
1629 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1630 igmp_send_report(in_dev, im, type);
1631 }
1632 #endif
1633 }
1634
1635 /*
1636 * A socket has left a multicast group on device dev
1637 */
1638
1639 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1640 {
1641 struct ip_mc_list *i;
1642 struct ip_mc_list __rcu **ip;
1643
1644 ASSERT_RTNL();
1645
1646 for (ip = &in_dev->mc_list;
1647 (i = rtnl_dereference(*ip)) != NULL;
1648 ip = &i->next_rcu) {
1649 if (i->multiaddr == addr) {
1650 if (--i->users == 0) {
1651 ip_mc_hash_remove(in_dev, i);
1652 *ip = i->next_rcu;
1653 in_dev->mc_count--;
1654 igmp_group_dropped(i);
1655 ip_mc_clear_src(i);
1656
1657 if (!in_dev->dead)
1658 ip_rt_multicast_event(in_dev);
1659
1660 ip_ma_put(i);
1661 return;
1662 }
1663 break;
1664 }
1665 }
1666 }
1667 EXPORT_SYMBOL(ip_mc_dec_group);
1668
1669 /* Device changing type */
1670
1671 void ip_mc_unmap(struct in_device *in_dev)
1672 {
1673 struct ip_mc_list *pmc;
1674
1675 ASSERT_RTNL();
1676
1677 for_each_pmc_rtnl(in_dev, pmc)
1678 igmp_group_dropped(pmc);
1679 }
1680
1681 void ip_mc_remap(struct in_device *in_dev)
1682 {
1683 struct ip_mc_list *pmc;
1684
1685 ASSERT_RTNL();
1686
1687 for_each_pmc_rtnl(in_dev, pmc) {
1688 #ifdef CONFIG_IP_MULTICAST
1689 igmpv3_del_delrec(in_dev, pmc);
1690 #endif
1691 igmp_group_added(pmc);
1692 }
1693 }
1694
1695 /* Device going down */
1696
1697 void ip_mc_down(struct in_device *in_dev)
1698 {
1699 struct ip_mc_list *pmc;
1700
1701 ASSERT_RTNL();
1702
1703 for_each_pmc_rtnl(in_dev, pmc)
1704 igmp_group_dropped(pmc);
1705
1706 #ifdef CONFIG_IP_MULTICAST
1707 in_dev->mr_ifc_count = 0;
1708 if (del_timer(&in_dev->mr_ifc_timer))
1709 __in_dev_put(in_dev);
1710 in_dev->mr_gq_running = 0;
1711 if (del_timer(&in_dev->mr_gq_timer))
1712 __in_dev_put(in_dev);
1713 #endif
1714
1715 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1716 }
1717
1718 void ip_mc_init_dev(struct in_device *in_dev)
1719 {
1720 #ifdef CONFIG_IP_MULTICAST
1721 struct net *net = dev_net(in_dev->dev);
1722 #endif
1723 ASSERT_RTNL();
1724
1725 #ifdef CONFIG_IP_MULTICAST
1726 timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0);
1727 timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0);
1728 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1729 #endif
1730
1731 spin_lock_init(&in_dev->mc_tomb_lock);
1732 }
1733
1734 /* Device going up */
1735
1736 void ip_mc_up(struct in_device *in_dev)
1737 {
1738 struct ip_mc_list *pmc;
1739 #ifdef CONFIG_IP_MULTICAST
1740 struct net *net = dev_net(in_dev->dev);
1741 #endif
1742
1743 ASSERT_RTNL();
1744
1745 #ifdef CONFIG_IP_MULTICAST
1746 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1747 #endif
1748 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1749
1750 for_each_pmc_rtnl(in_dev, pmc) {
1751 #ifdef CONFIG_IP_MULTICAST
1752 igmpv3_del_delrec(in_dev, pmc);
1753 #endif
1754 igmp_group_added(pmc);
1755 }
1756 }
1757
1758 /*
1759 * Device is about to be destroyed: clean up.
1760 */
1761
1762 void ip_mc_destroy_dev(struct in_device *in_dev)
1763 {
1764 struct ip_mc_list *i;
1765
1766 ASSERT_RTNL();
1767
1768 /* Deactivate timers */
1769 ip_mc_down(in_dev);
1770 #ifdef CONFIG_IP_MULTICAST
1771 igmpv3_clear_delrec(in_dev);
1772 #endif
1773
1774 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1775 in_dev->mc_list = i->next_rcu;
1776 in_dev->mc_count--;
1777 ip_ma_put(i);
1778 }
1779 }
1780
1781 /* RTNL is locked */
1782 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1783 {
1784 struct net_device *dev = NULL;
1785 struct in_device *idev = NULL;
1786
1787 if (imr->imr_ifindex) {
1788 idev = inetdev_by_index(net, imr->imr_ifindex);
1789 return idev;
1790 }
1791 if (imr->imr_address.s_addr) {
1792 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1793 if (!dev)
1794 return NULL;
1795 }
1796
1797 if (!dev) {
1798 struct rtable *rt = ip_route_output(net,
1799 imr->imr_multiaddr.s_addr,
1800 0, 0, 0);
1801 if (!IS_ERR(rt)) {
1802 dev = rt->dst.dev;
1803 ip_rt_put(rt);
1804 }
1805 }
1806 if (dev) {
1807 imr->imr_ifindex = dev->ifindex;
1808 idev = __in_dev_get_rtnl(dev);
1809 }
1810 return idev;
1811 }
1812
1813 /*
1814 * Join a socket to a group
1815 */
1816
1817 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1818 __be32 *psfsrc)
1819 {
1820 struct ip_sf_list *psf, *psf_prev;
1821 int rv = 0;
1822
1823 psf_prev = NULL;
1824 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1825 if (psf->sf_inaddr == *psfsrc)
1826 break;
1827 psf_prev = psf;
1828 }
1829 if (!psf || psf->sf_count[sfmode] == 0) {
1830 /* source filter not found, or count wrong => bug */
1831 return -ESRCH;
1832 }
1833 psf->sf_count[sfmode]--;
1834 if (psf->sf_count[sfmode] == 0) {
1835 ip_rt_multicast_event(pmc->interface);
1836 }
1837 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1838 #ifdef CONFIG_IP_MULTICAST
1839 struct in_device *in_dev = pmc->interface;
1840 struct net *net = dev_net(in_dev->dev);
1841 #endif
1842
1843 /* no more filters for this source */
1844 if (psf_prev)
1845 psf_prev->sf_next = psf->sf_next;
1846 else
1847 pmc->sources = psf->sf_next;
1848 #ifdef CONFIG_IP_MULTICAST
1849 if (psf->sf_oldin &&
1850 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1851 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1852 psf->sf_next = pmc->tomb;
1853 pmc->tomb = psf;
1854 rv = 1;
1855 } else
1856 #endif
1857 kfree(psf);
1858 }
1859 return rv;
1860 }
1861
1862 #ifndef CONFIG_IP_MULTICAST
1863 #define igmp_ifc_event(x) do { } while (0)
1864 #endif
1865
1866 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1867 int sfcount, __be32 *psfsrc, int delta)
1868 {
1869 struct ip_mc_list *pmc;
1870 int changerec = 0;
1871 int i, err;
1872
1873 if (!in_dev)
1874 return -ENODEV;
1875 rcu_read_lock();
1876 for_each_pmc_rcu(in_dev, pmc) {
1877 if (*pmca == pmc->multiaddr)
1878 break;
1879 }
1880 if (!pmc) {
1881 /* MCA not found?? bug */
1882 rcu_read_unlock();
1883 return -ESRCH;
1884 }
1885 spin_lock_bh(&pmc->lock);
1886 rcu_read_unlock();
1887 #ifdef CONFIG_IP_MULTICAST
1888 sf_markstate(pmc);
1889 #endif
1890 if (!delta) {
1891 err = -EINVAL;
1892 if (!pmc->sfcount[sfmode])
1893 goto out_unlock;
1894 pmc->sfcount[sfmode]--;
1895 }
1896 err = 0;
1897 for (i = 0; i < sfcount; i++) {
1898 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1899
1900 changerec |= rv > 0;
1901 if (!err && rv < 0)
1902 err = rv;
1903 }
1904 if (pmc->sfmode == MCAST_EXCLUDE &&
1905 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1906 pmc->sfcount[MCAST_INCLUDE]) {
1907 #ifdef CONFIG_IP_MULTICAST
1908 struct ip_sf_list *psf;
1909 struct net *net = dev_net(in_dev->dev);
1910 #endif
1911
1912 /* filter mode change */
1913 pmc->sfmode = MCAST_INCLUDE;
1914 #ifdef CONFIG_IP_MULTICAST
1915 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1916 in_dev->mr_ifc_count = pmc->crcount;
1917 for (psf = pmc->sources; psf; psf = psf->sf_next)
1918 psf->sf_crcount = 0;
1919 igmp_ifc_event(pmc->interface);
1920 } else if (sf_setstate(pmc) || changerec) {
1921 igmp_ifc_event(pmc->interface);
1922 #endif
1923 }
1924 out_unlock:
1925 spin_unlock_bh(&pmc->lock);
1926 return err;
1927 }
1928
1929 /*
1930 * Add multicast single-source filter to the interface list
1931 */
1932 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1933 __be32 *psfsrc)
1934 {
1935 struct ip_sf_list *psf, *psf_prev;
1936
1937 psf_prev = NULL;
1938 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1939 if (psf->sf_inaddr == *psfsrc)
1940 break;
1941 psf_prev = psf;
1942 }
1943 if (!psf) {
1944 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1945 if (!psf)
1946 return -ENOBUFS;
1947 psf->sf_inaddr = *psfsrc;
1948 if (psf_prev) {
1949 psf_prev->sf_next = psf;
1950 } else
1951 pmc->sources = psf;
1952 }
1953 psf->sf_count[sfmode]++;
1954 if (psf->sf_count[sfmode] == 1) {
1955 ip_rt_multicast_event(pmc->interface);
1956 }
1957 return 0;
1958 }
1959
1960 #ifdef CONFIG_IP_MULTICAST
1961 static void sf_markstate(struct ip_mc_list *pmc)
1962 {
1963 struct ip_sf_list *psf;
1964 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1965
1966 for (psf = pmc->sources; psf; psf = psf->sf_next)
1967 if (pmc->sfcount[MCAST_EXCLUDE]) {
1968 psf->sf_oldin = mca_xcount ==
1969 psf->sf_count[MCAST_EXCLUDE] &&
1970 !psf->sf_count[MCAST_INCLUDE];
1971 } else
1972 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1973 }
1974
1975 static int sf_setstate(struct ip_mc_list *pmc)
1976 {
1977 struct ip_sf_list *psf, *dpsf;
1978 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1979 int qrv = pmc->interface->mr_qrv;
1980 int new_in, rv;
1981
1982 rv = 0;
1983 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1984 if (pmc->sfcount[MCAST_EXCLUDE]) {
1985 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1986 !psf->sf_count[MCAST_INCLUDE];
1987 } else
1988 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1989 if (new_in) {
1990 if (!psf->sf_oldin) {
1991 struct ip_sf_list *prev = NULL;
1992
1993 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1994 if (dpsf->sf_inaddr == psf->sf_inaddr)
1995 break;
1996 prev = dpsf;
1997 }
1998 if (dpsf) {
1999 if (prev)
2000 prev->sf_next = dpsf->sf_next;
2001 else
2002 pmc->tomb = dpsf->sf_next;
2003 kfree(dpsf);
2004 }
2005 psf->sf_crcount = qrv;
2006 rv++;
2007 }
2008 } else if (psf->sf_oldin) {
2009
2010 psf->sf_crcount = 0;
2011 /*
2012 * add or update "delete" records if an active filter
2013 * is now inactive
2014 */
2015 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
2016 if (dpsf->sf_inaddr == psf->sf_inaddr)
2017 break;
2018 if (!dpsf) {
2019 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2020 if (!dpsf)
2021 continue;
2022 *dpsf = *psf;
2023 /* pmc->lock held by callers */
2024 dpsf->sf_next = pmc->tomb;
2025 pmc->tomb = dpsf;
2026 }
2027 dpsf->sf_crcount = qrv;
2028 rv++;
2029 }
2030 }
2031 return rv;
2032 }
2033 #endif
2034
2035 /*
2036 * Add multicast source filter list to the interface list
2037 */
2038 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2039 int sfcount, __be32 *psfsrc, int delta)
2040 {
2041 struct ip_mc_list *pmc;
2042 int isexclude;
2043 int i, err;
2044
2045 if (!in_dev)
2046 return -ENODEV;
2047 rcu_read_lock();
2048 for_each_pmc_rcu(in_dev, pmc) {
2049 if (*pmca == pmc->multiaddr)
2050 break;
2051 }
2052 if (!pmc) {
2053 /* MCA not found?? bug */
2054 rcu_read_unlock();
2055 return -ESRCH;
2056 }
2057 spin_lock_bh(&pmc->lock);
2058 rcu_read_unlock();
2059
2060 #ifdef CONFIG_IP_MULTICAST
2061 sf_markstate(pmc);
2062 #endif
2063 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2064 if (!delta)
2065 pmc->sfcount[sfmode]++;
2066 err = 0;
2067 for (i = 0; i < sfcount; i++) {
2068 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2069 if (err)
2070 break;
2071 }
2072 if (err) {
2073 int j;
2074
2075 if (!delta)
2076 pmc->sfcount[sfmode]--;
2077 for (j = 0; j < i; j++)
2078 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2079 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2080 #ifdef CONFIG_IP_MULTICAST
2081 struct ip_sf_list *psf;
2082 struct net *net = dev_net(pmc->interface->dev);
2083 in_dev = pmc->interface;
2084 #endif
2085
2086 /* filter mode change */
2087 if (pmc->sfcount[MCAST_EXCLUDE])
2088 pmc->sfmode = MCAST_EXCLUDE;
2089 else if (pmc->sfcount[MCAST_INCLUDE])
2090 pmc->sfmode = MCAST_INCLUDE;
2091 #ifdef CONFIG_IP_MULTICAST
2092 /* else no filters; keep old mode for reports */
2093
2094 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2095 in_dev->mr_ifc_count = pmc->crcount;
2096 for (psf = pmc->sources; psf; psf = psf->sf_next)
2097 psf->sf_crcount = 0;
2098 igmp_ifc_event(in_dev);
2099 } else if (sf_setstate(pmc)) {
2100 igmp_ifc_event(in_dev);
2101 #endif
2102 }
2103 spin_unlock_bh(&pmc->lock);
2104 return err;
2105 }
2106
2107 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2108 {
2109 struct ip_sf_list *psf, *nextpsf, *tomb, *sources;
2110
2111 spin_lock_bh(&pmc->lock);
2112 tomb = pmc->tomb;
2113 pmc->tomb = NULL;
2114 sources = pmc->sources;
2115 pmc->sources = NULL;
2116 pmc->sfmode = MCAST_EXCLUDE;
2117 pmc->sfcount[MCAST_INCLUDE] = 0;
2118 pmc->sfcount[MCAST_EXCLUDE] = 1;
2119 spin_unlock_bh(&pmc->lock);
2120
2121 for (psf = tomb; psf; psf = nextpsf) {
2122 nextpsf = psf->sf_next;
2123 kfree(psf);
2124 }
2125 for (psf = sources; psf; psf = nextpsf) {
2126 nextpsf = psf->sf_next;
2127 kfree(psf);
2128 }
2129 }
2130
2131 /* Join a multicast group
2132 */
2133
2134 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2135 {
2136 __be32 addr = imr->imr_multiaddr.s_addr;
2137 struct ip_mc_socklist *iml, *i;
2138 struct in_device *in_dev;
2139 struct inet_sock *inet = inet_sk(sk);
2140 struct net *net = sock_net(sk);
2141 int ifindex;
2142 int count = 0;
2143 int err;
2144
2145 ASSERT_RTNL();
2146
2147 if (!ipv4_is_multicast(addr))
2148 return -EINVAL;
2149
2150 in_dev = ip_mc_find_dev(net, imr);
2151
2152 if (!in_dev) {
2153 err = -ENODEV;
2154 goto done;
2155 }
2156
2157 err = -EADDRINUSE;
2158 ifindex = imr->imr_ifindex;
2159 for_each_pmc_rtnl(inet, i) {
2160 if (i->multi.imr_multiaddr.s_addr == addr &&
2161 i->multi.imr_ifindex == ifindex)
2162 goto done;
2163 count++;
2164 }
2165 err = -ENOBUFS;
2166 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2167 goto done;
2168 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2169 if (!iml)
2170 goto done;
2171
2172 memcpy(&iml->multi, imr, sizeof(*imr));
2173 iml->next_rcu = inet->mc_list;
2174 iml->sflist = NULL;
2175 iml->sfmode = MCAST_EXCLUDE;
2176 rcu_assign_pointer(inet->mc_list, iml);
2177 ip_mc_inc_group(in_dev, addr);
2178 err = 0;
2179 done:
2180 return err;
2181 }
2182 EXPORT_SYMBOL(ip_mc_join_group);
2183
2184 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2185 struct in_device *in_dev)
2186 {
2187 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2188 int err;
2189
2190 if (!psf) {
2191 /* any-source empty exclude case */
2192 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2193 iml->sfmode, 0, NULL, 0);
2194 }
2195 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2196 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2197 RCU_INIT_POINTER(iml->sflist, NULL);
2198 /* decrease mem now to avoid the memleak warning */
2199 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2200 kfree_rcu(psf, rcu);
2201 return err;
2202 }
2203
2204 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2205 {
2206 struct inet_sock *inet = inet_sk(sk);
2207 struct ip_mc_socklist *iml;
2208 struct ip_mc_socklist __rcu **imlp;
2209 struct in_device *in_dev;
2210 struct net *net = sock_net(sk);
2211 __be32 group = imr->imr_multiaddr.s_addr;
2212 u32 ifindex;
2213 int ret = -EADDRNOTAVAIL;
2214
2215 ASSERT_RTNL();
2216
2217 in_dev = ip_mc_find_dev(net, imr);
2218 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2219 ret = -ENODEV;
2220 goto out;
2221 }
2222 ifindex = imr->imr_ifindex;
2223 for (imlp = &inet->mc_list;
2224 (iml = rtnl_dereference(*imlp)) != NULL;
2225 imlp = &iml->next_rcu) {
2226 if (iml->multi.imr_multiaddr.s_addr != group)
2227 continue;
2228 if (ifindex) {
2229 if (iml->multi.imr_ifindex != ifindex)
2230 continue;
2231 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2232 iml->multi.imr_address.s_addr)
2233 continue;
2234
2235 (void) ip_mc_leave_src(sk, iml, in_dev);
2236
2237 *imlp = iml->next_rcu;
2238
2239 if (in_dev)
2240 ip_mc_dec_group(in_dev, group);
2241
2242 /* decrease mem now to avoid the memleak warning */
2243 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2244 kfree_rcu(iml, rcu);
2245 return 0;
2246 }
2247 out:
2248 return ret;
2249 }
2250 EXPORT_SYMBOL(ip_mc_leave_group);
2251
2252 int ip_mc_source(int add, int omode, struct sock *sk, struct
2253 ip_mreq_source *mreqs, int ifindex)
2254 {
2255 int err;
2256 struct ip_mreqn imr;
2257 __be32 addr = mreqs->imr_multiaddr;
2258 struct ip_mc_socklist *pmc;
2259 struct in_device *in_dev = NULL;
2260 struct inet_sock *inet = inet_sk(sk);
2261 struct ip_sf_socklist *psl;
2262 struct net *net = sock_net(sk);
2263 int leavegroup = 0;
2264 int i, j, rv;
2265
2266 if (!ipv4_is_multicast(addr))
2267 return -EINVAL;
2268
2269 ASSERT_RTNL();
2270
2271 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2272 imr.imr_address.s_addr = mreqs->imr_interface;
2273 imr.imr_ifindex = ifindex;
2274 in_dev = ip_mc_find_dev(net, &imr);
2275
2276 if (!in_dev) {
2277 err = -ENODEV;
2278 goto done;
2279 }
2280 err = -EADDRNOTAVAIL;
2281
2282 for_each_pmc_rtnl(inet, pmc) {
2283 if ((pmc->multi.imr_multiaddr.s_addr ==
2284 imr.imr_multiaddr.s_addr) &&
2285 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2286 break;
2287 }
2288 if (!pmc) { /* must have a prior join */
2289 err = -EINVAL;
2290 goto done;
2291 }
2292 /* if a source filter was set, must be the same mode as before */
2293 if (pmc->sflist) {
2294 if (pmc->sfmode != omode) {
2295 err = -EINVAL;
2296 goto done;
2297 }
2298 } else if (pmc->sfmode != omode) {
2299 /* allow mode switches for empty-set filters */
2300 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2301 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2302 NULL, 0);
2303 pmc->sfmode = omode;
2304 }
2305
2306 psl = rtnl_dereference(pmc->sflist);
2307 if (!add) {
2308 if (!psl)
2309 goto done; /* err = -EADDRNOTAVAIL */
2310 rv = !0;
2311 for (i = 0; i < psl->sl_count; i++) {
2312 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2313 sizeof(__be32));
2314 if (rv == 0)
2315 break;
2316 }
2317 if (rv) /* source not found */
2318 goto done; /* err = -EADDRNOTAVAIL */
2319
2320 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2321 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2322 leavegroup = 1;
2323 goto done;
2324 }
2325
2326 /* update the interface filter */
2327 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2328 &mreqs->imr_sourceaddr, 1);
2329
2330 for (j = i+1; j < psl->sl_count; j++)
2331 psl->sl_addr[j-1] = psl->sl_addr[j];
2332 psl->sl_count--;
2333 err = 0;
2334 goto done;
2335 }
2336 /* else, add a new source to the filter */
2337
2338 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2339 err = -ENOBUFS;
2340 goto done;
2341 }
2342 if (!psl || psl->sl_count == psl->sl_max) {
2343 struct ip_sf_socklist *newpsl;
2344 int count = IP_SFBLOCK;
2345
2346 if (psl)
2347 count += psl->sl_max;
2348 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2349 if (!newpsl) {
2350 err = -ENOBUFS;
2351 goto done;
2352 }
2353 newpsl->sl_max = count;
2354 newpsl->sl_count = count - IP_SFBLOCK;
2355 if (psl) {
2356 for (i = 0; i < psl->sl_count; i++)
2357 newpsl->sl_addr[i] = psl->sl_addr[i];
2358 /* decrease mem now to avoid the memleak warning */
2359 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2360 kfree_rcu(psl, rcu);
2361 }
2362 rcu_assign_pointer(pmc->sflist, newpsl);
2363 psl = newpsl;
2364 }
2365 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2366 for (i = 0; i < psl->sl_count; i++) {
2367 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2368 sizeof(__be32));
2369 if (rv == 0)
2370 break;
2371 }
2372 if (rv == 0) /* address already there is an error */
2373 goto done;
2374 for (j = psl->sl_count-1; j >= i; j--)
2375 psl->sl_addr[j+1] = psl->sl_addr[j];
2376 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2377 psl->sl_count++;
2378 err = 0;
2379 /* update the interface list */
2380 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2381 &mreqs->imr_sourceaddr, 1);
2382 done:
2383 if (leavegroup)
2384 err = ip_mc_leave_group(sk, &imr);
2385 return err;
2386 }
2387
2388 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2389 {
2390 int err = 0;
2391 struct ip_mreqn imr;
2392 __be32 addr = msf->imsf_multiaddr;
2393 struct ip_mc_socklist *pmc;
2394 struct in_device *in_dev;
2395 struct inet_sock *inet = inet_sk(sk);
2396 struct ip_sf_socklist *newpsl, *psl;
2397 struct net *net = sock_net(sk);
2398 int leavegroup = 0;
2399
2400 if (!ipv4_is_multicast(addr))
2401 return -EINVAL;
2402 if (msf->imsf_fmode != MCAST_INCLUDE &&
2403 msf->imsf_fmode != MCAST_EXCLUDE)
2404 return -EINVAL;
2405
2406 ASSERT_RTNL();
2407
2408 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2409 imr.imr_address.s_addr = msf->imsf_interface;
2410 imr.imr_ifindex = ifindex;
2411 in_dev = ip_mc_find_dev(net, &imr);
2412
2413 if (!in_dev) {
2414 err = -ENODEV;
2415 goto done;
2416 }
2417
2418 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2419 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2420 leavegroup = 1;
2421 goto done;
2422 }
2423
2424 for_each_pmc_rtnl(inet, pmc) {
2425 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2426 pmc->multi.imr_ifindex == imr.imr_ifindex)
2427 break;
2428 }
2429 if (!pmc) { /* must have a prior join */
2430 err = -EINVAL;
2431 goto done;
2432 }
2433 if (msf->imsf_numsrc) {
2434 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2435 GFP_KERNEL);
2436 if (!newpsl) {
2437 err = -ENOBUFS;
2438 goto done;
2439 }
2440 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2441 memcpy(newpsl->sl_addr, msf->imsf_slist,
2442 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2443 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2444 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2445 if (err) {
2446 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2447 goto done;
2448 }
2449 } else {
2450 newpsl = NULL;
2451 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2452 msf->imsf_fmode, 0, NULL, 0);
2453 }
2454 psl = rtnl_dereference(pmc->sflist);
2455 if (psl) {
2456 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2457 psl->sl_count, psl->sl_addr, 0);
2458 /* decrease mem now to avoid the memleak warning */
2459 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2460 kfree_rcu(psl, rcu);
2461 } else
2462 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2463 0, NULL, 0);
2464 rcu_assign_pointer(pmc->sflist, newpsl);
2465 pmc->sfmode = msf->imsf_fmode;
2466 err = 0;
2467 done:
2468 if (leavegroup)
2469 err = ip_mc_leave_group(sk, &imr);
2470 return err;
2471 }
2472
2473 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2474 struct ip_msfilter __user *optval, int __user *optlen)
2475 {
2476 int err, len, count, copycount;
2477 struct ip_mreqn imr;
2478 __be32 addr = msf->imsf_multiaddr;
2479 struct ip_mc_socklist *pmc;
2480 struct in_device *in_dev;
2481 struct inet_sock *inet = inet_sk(sk);
2482 struct ip_sf_socklist *psl;
2483 struct net *net = sock_net(sk);
2484
2485 ASSERT_RTNL();
2486
2487 if (!ipv4_is_multicast(addr))
2488 return -EINVAL;
2489
2490 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2491 imr.imr_address.s_addr = msf->imsf_interface;
2492 imr.imr_ifindex = 0;
2493 in_dev = ip_mc_find_dev(net, &imr);
2494
2495 if (!in_dev) {
2496 err = -ENODEV;
2497 goto done;
2498 }
2499 err = -EADDRNOTAVAIL;
2500
2501 for_each_pmc_rtnl(inet, pmc) {
2502 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2503 pmc->multi.imr_ifindex == imr.imr_ifindex)
2504 break;
2505 }
2506 if (!pmc) /* must have a prior join */
2507 goto done;
2508 msf->imsf_fmode = pmc->sfmode;
2509 psl = rtnl_dereference(pmc->sflist);
2510 if (!psl) {
2511 len = 0;
2512 count = 0;
2513 } else {
2514 count = psl->sl_count;
2515 }
2516 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2517 len = copycount * sizeof(psl->sl_addr[0]);
2518 msf->imsf_numsrc = count;
2519 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2520 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2521 return -EFAULT;
2522 }
2523 if (len &&
2524 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2525 return -EFAULT;
2526 return 0;
2527 done:
2528 return err;
2529 }
2530
2531 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2532 struct group_filter __user *optval, int __user *optlen)
2533 {
2534 int err, i, count, copycount;
2535 struct sockaddr_in *psin;
2536 __be32 addr;
2537 struct ip_mc_socklist *pmc;
2538 struct inet_sock *inet = inet_sk(sk);
2539 struct ip_sf_socklist *psl;
2540
2541 ASSERT_RTNL();
2542
2543 psin = (struct sockaddr_in *)&gsf->gf_group;
2544 if (psin->sin_family != AF_INET)
2545 return -EINVAL;
2546 addr = psin->sin_addr.s_addr;
2547 if (!ipv4_is_multicast(addr))
2548 return -EINVAL;
2549
2550 err = -EADDRNOTAVAIL;
2551
2552 for_each_pmc_rtnl(inet, pmc) {
2553 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2554 pmc->multi.imr_ifindex == gsf->gf_interface)
2555 break;
2556 }
2557 if (!pmc) /* must have a prior join */
2558 goto done;
2559 gsf->gf_fmode = pmc->sfmode;
2560 psl = rtnl_dereference(pmc->sflist);
2561 count = psl ? psl->sl_count : 0;
2562 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2563 gsf->gf_numsrc = count;
2564 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2565 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2566 return -EFAULT;
2567 }
2568 for (i = 0; i < copycount; i++) {
2569 struct sockaddr_storage ss;
2570
2571 psin = (struct sockaddr_in *)&ss;
2572 memset(&ss, 0, sizeof(ss));
2573 psin->sin_family = AF_INET;
2574 psin->sin_addr.s_addr = psl->sl_addr[i];
2575 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2576 return -EFAULT;
2577 }
2578 return 0;
2579 done:
2580 return err;
2581 }
2582
2583 /*
2584 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2585 */
2586 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr,
2587 int dif, int sdif)
2588 {
2589 struct inet_sock *inet = inet_sk(sk);
2590 struct ip_mc_socklist *pmc;
2591 struct ip_sf_socklist *psl;
2592 int i;
2593 int ret;
2594
2595 ret = 1;
2596 if (!ipv4_is_multicast(loc_addr))
2597 goto out;
2598
2599 rcu_read_lock();
2600 for_each_pmc_rcu(inet, pmc) {
2601 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2602 (pmc->multi.imr_ifindex == dif ||
2603 (sdif && pmc->multi.imr_ifindex == sdif)))
2604 break;
2605 }
2606 ret = inet->mc_all;
2607 if (!pmc)
2608 goto unlock;
2609 psl = rcu_dereference(pmc->sflist);
2610 ret = (pmc->sfmode == MCAST_EXCLUDE);
2611 if (!psl)
2612 goto unlock;
2613
2614 for (i = 0; i < psl->sl_count; i++) {
2615 if (psl->sl_addr[i] == rmt_addr)
2616 break;
2617 }
2618 ret = 0;
2619 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2620 goto unlock;
2621 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2622 goto unlock;
2623 ret = 1;
2624 unlock:
2625 rcu_read_unlock();
2626 out:
2627 return ret;
2628 }
2629
2630 /*
2631 * A socket is closing.
2632 */
2633
2634 void ip_mc_drop_socket(struct sock *sk)
2635 {
2636 struct inet_sock *inet = inet_sk(sk);
2637 struct ip_mc_socklist *iml;
2638 struct net *net = sock_net(sk);
2639
2640 if (!inet->mc_list)
2641 return;
2642
2643 rtnl_lock();
2644 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2645 struct in_device *in_dev;
2646
2647 inet->mc_list = iml->next_rcu;
2648 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2649 (void) ip_mc_leave_src(sk, iml, in_dev);
2650 if (in_dev)
2651 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2652 /* decrease mem now to avoid the memleak warning */
2653 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2654 kfree_rcu(iml, rcu);
2655 }
2656 rtnl_unlock();
2657 }
2658
2659 /* called with rcu_read_lock() */
2660 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2661 {
2662 struct ip_mc_list *im;
2663 struct ip_mc_list __rcu **mc_hash;
2664 struct ip_sf_list *psf;
2665 int rv = 0;
2666
2667 mc_hash = rcu_dereference(in_dev->mc_hash);
2668 if (mc_hash) {
2669 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2670
2671 for (im = rcu_dereference(mc_hash[hash]);
2672 im != NULL;
2673 im = rcu_dereference(im->next_hash)) {
2674 if (im->multiaddr == mc_addr)
2675 break;
2676 }
2677 } else {
2678 for_each_pmc_rcu(in_dev, im) {
2679 if (im->multiaddr == mc_addr)
2680 break;
2681 }
2682 }
2683 if (im && proto == IPPROTO_IGMP) {
2684 rv = 1;
2685 } else if (im) {
2686 if (src_addr) {
2687 for (psf = im->sources; psf; psf = psf->sf_next) {
2688 if (psf->sf_inaddr == src_addr)
2689 break;
2690 }
2691 if (psf)
2692 rv = psf->sf_count[MCAST_INCLUDE] ||
2693 psf->sf_count[MCAST_EXCLUDE] !=
2694 im->sfcount[MCAST_EXCLUDE];
2695 else
2696 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2697 } else
2698 rv = 1; /* unspecified source; tentatively allow */
2699 }
2700 return rv;
2701 }
2702
2703 #if defined(CONFIG_PROC_FS)
2704 struct igmp_mc_iter_state {
2705 struct seq_net_private p;
2706 struct net_device *dev;
2707 struct in_device *in_dev;
2708 };
2709
2710 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2711
2712 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2713 {
2714 struct net *net = seq_file_net(seq);
2715 struct ip_mc_list *im = NULL;
2716 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2717
2718 state->in_dev = NULL;
2719 for_each_netdev_rcu(net, state->dev) {
2720 struct in_device *in_dev;
2721
2722 in_dev = __in_dev_get_rcu(state->dev);
2723 if (!in_dev)
2724 continue;
2725 im = rcu_dereference(in_dev->mc_list);
2726 if (im) {
2727 state->in_dev = in_dev;
2728 break;
2729 }
2730 }
2731 return im;
2732 }
2733
2734 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2735 {
2736 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2737
2738 im = rcu_dereference(im->next_rcu);
2739 while (!im) {
2740 state->dev = next_net_device_rcu(state->dev);
2741 if (!state->dev) {
2742 state->in_dev = NULL;
2743 break;
2744 }
2745 state->in_dev = __in_dev_get_rcu(state->dev);
2746 if (!state->in_dev)
2747 continue;
2748 im = rcu_dereference(state->in_dev->mc_list);
2749 }
2750 return im;
2751 }
2752
2753 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2754 {
2755 struct ip_mc_list *im = igmp_mc_get_first(seq);
2756 if (im)
2757 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2758 --pos;
2759 return pos ? NULL : im;
2760 }
2761
2762 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2763 __acquires(rcu)
2764 {
2765 rcu_read_lock();
2766 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2767 }
2768
2769 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2770 {
2771 struct ip_mc_list *im;
2772 if (v == SEQ_START_TOKEN)
2773 im = igmp_mc_get_first(seq);
2774 else
2775 im = igmp_mc_get_next(seq, v);
2776 ++*pos;
2777 return im;
2778 }
2779
2780 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2781 __releases(rcu)
2782 {
2783 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2784
2785 state->in_dev = NULL;
2786 state->dev = NULL;
2787 rcu_read_unlock();
2788 }
2789
2790 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2791 {
2792 if (v == SEQ_START_TOKEN)
2793 seq_puts(seq,
2794 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2795 else {
2796 struct ip_mc_list *im = (struct ip_mc_list *)v;
2797 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2798 char *querier;
2799 long delta;
2800
2801 #ifdef CONFIG_IP_MULTICAST
2802 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2803 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2804 "V3";
2805 #else
2806 querier = "NONE";
2807 #endif
2808
2809 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2810 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2811 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2812 }
2813
2814 delta = im->timer.expires - jiffies;
2815 seq_printf(seq,
2816 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2817 im->multiaddr, im->users,
2818 im->tm_running,
2819 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2820 im->reporter);
2821 }
2822 return 0;
2823 }
2824
2825 static const struct seq_operations igmp_mc_seq_ops = {
2826 .start = igmp_mc_seq_start,
2827 .next = igmp_mc_seq_next,
2828 .stop = igmp_mc_seq_stop,
2829 .show = igmp_mc_seq_show,
2830 };
2831
2832 struct igmp_mcf_iter_state {
2833 struct seq_net_private p;
2834 struct net_device *dev;
2835 struct in_device *idev;
2836 struct ip_mc_list *im;
2837 };
2838
2839 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2840
2841 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2842 {
2843 struct net *net = seq_file_net(seq);
2844 struct ip_sf_list *psf = NULL;
2845 struct ip_mc_list *im = NULL;
2846 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2847
2848 state->idev = NULL;
2849 state->im = NULL;
2850 for_each_netdev_rcu(net, state->dev) {
2851 struct in_device *idev;
2852 idev = __in_dev_get_rcu(state->dev);
2853 if (unlikely(!idev))
2854 continue;
2855 im = rcu_dereference(idev->mc_list);
2856 if (likely(im)) {
2857 spin_lock_bh(&im->lock);
2858 psf = im->sources;
2859 if (likely(psf)) {
2860 state->im = im;
2861 state->idev = idev;
2862 break;
2863 }
2864 spin_unlock_bh(&im->lock);
2865 }
2866 }
2867 return psf;
2868 }
2869
2870 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2871 {
2872 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2873
2874 psf = psf->sf_next;
2875 while (!psf) {
2876 spin_unlock_bh(&state->im->lock);
2877 state->im = state->im->next;
2878 while (!state->im) {
2879 state->dev = next_net_device_rcu(state->dev);
2880 if (!state->dev) {
2881 state->idev = NULL;
2882 goto out;
2883 }
2884 state->idev = __in_dev_get_rcu(state->dev);
2885 if (!state->idev)
2886 continue;
2887 state->im = rcu_dereference(state->idev->mc_list);
2888 }
2889 if (!state->im)
2890 break;
2891 spin_lock_bh(&state->im->lock);
2892 psf = state->im->sources;
2893 }
2894 out:
2895 return psf;
2896 }
2897
2898 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2899 {
2900 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2901 if (psf)
2902 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2903 --pos;
2904 return pos ? NULL : psf;
2905 }
2906
2907 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2908 __acquires(rcu)
2909 {
2910 rcu_read_lock();
2911 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2912 }
2913
2914 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2915 {
2916 struct ip_sf_list *psf;
2917 if (v == SEQ_START_TOKEN)
2918 psf = igmp_mcf_get_first(seq);
2919 else
2920 psf = igmp_mcf_get_next(seq, v);
2921 ++*pos;
2922 return psf;
2923 }
2924
2925 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2926 __releases(rcu)
2927 {
2928 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2929 if (likely(state->im)) {
2930 spin_unlock_bh(&state->im->lock);
2931 state->im = NULL;
2932 }
2933 state->idev = NULL;
2934 state->dev = NULL;
2935 rcu_read_unlock();
2936 }
2937
2938 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2939 {
2940 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2941 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2942
2943 if (v == SEQ_START_TOKEN) {
2944 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2945 } else {
2946 seq_printf(seq,
2947 "%3d %6.6s 0x%08x "
2948 "0x%08x %6lu %6lu\n",
2949 state->dev->ifindex, state->dev->name,
2950 ntohl(state->im->multiaddr),
2951 ntohl(psf->sf_inaddr),
2952 psf->sf_count[MCAST_INCLUDE],
2953 psf->sf_count[MCAST_EXCLUDE]);
2954 }
2955 return 0;
2956 }
2957
2958 static const struct seq_operations igmp_mcf_seq_ops = {
2959 .start = igmp_mcf_seq_start,
2960 .next = igmp_mcf_seq_next,
2961 .stop = igmp_mcf_seq_stop,
2962 .show = igmp_mcf_seq_show,
2963 };
2964
2965 static int __net_init igmp_net_init(struct net *net)
2966 {
2967 struct proc_dir_entry *pde;
2968 int err;
2969
2970 pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops,
2971 sizeof(struct igmp_mc_iter_state));
2972 if (!pde)
2973 goto out_igmp;
2974 pde = proc_create_net("mcfilter", 0444, net->proc_net,
2975 &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state));
2976 if (!pde)
2977 goto out_mcfilter;
2978 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2979 SOCK_DGRAM, 0, net);
2980 if (err < 0) {
2981 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2982 err);
2983 goto out_sock;
2984 }
2985
2986 return 0;
2987
2988 out_sock:
2989 remove_proc_entry("mcfilter", net->proc_net);
2990 out_mcfilter:
2991 remove_proc_entry("igmp", net->proc_net);
2992 out_igmp:
2993 return -ENOMEM;
2994 }
2995
2996 static void __net_exit igmp_net_exit(struct net *net)
2997 {
2998 remove_proc_entry("mcfilter", net->proc_net);
2999 remove_proc_entry("igmp", net->proc_net);
3000 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
3001 }
3002
3003 static struct pernet_operations igmp_net_ops = {
3004 .init = igmp_net_init,
3005 .exit = igmp_net_exit,
3006 };
3007 #endif
3008
3009 static int igmp_netdev_event(struct notifier_block *this,
3010 unsigned long event, void *ptr)
3011 {
3012 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3013 struct in_device *in_dev;
3014
3015 switch (event) {
3016 case NETDEV_RESEND_IGMP:
3017 in_dev = __in_dev_get_rtnl(dev);
3018 if (in_dev)
3019 ip_mc_rejoin_groups(in_dev);
3020 break;
3021 default:
3022 break;
3023 }
3024 return NOTIFY_DONE;
3025 }
3026
3027 static struct notifier_block igmp_notifier = {
3028 .notifier_call = igmp_netdev_event,
3029 };
3030
3031 int __init igmp_mc_init(void)
3032 {
3033 #if defined(CONFIG_PROC_FS)
3034 int err;
3035
3036 err = register_pernet_subsys(&igmp_net_ops);
3037 if (err)
3038 return err;
3039 err = register_netdevice_notifier(&igmp_notifier);
3040 if (err)
3041 goto reg_notif_fail;
3042 return 0;
3043
3044 reg_notif_fail:
3045 unregister_pernet_subsys(&igmp_net_ops);
3046 return err;
3047 #else
3048 return register_netdevice_notifier(&igmp_notifier);
3049 #endif
3050 }
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