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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[people/ms/linux.git] / net / ipv4 / igmp.c
1 /*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
11 * Authors:
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 * Fixes:
20 *
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
23 * functions.
24 * Alan Cox : Dumped the header building experiment.
25 * Alan Cox : Minor tweaks ready for multicast routing
26 * and extended IGMP protocol.
27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
28 * writes utterly bogus code otherwise (sigh)
29 * fixed IGMP loopback to behave in the manner
30 * desired by mrouted, fixed the fact it has been
31 * broken since 1.3.6 and cleaned up a few minor
32 * points.
33 *
34 * Chih-Jen Chang : Tried to revise IGMP to Version 2
35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
36 * The enhancements are mainly based on Steve Deering's
37 * ipmulti-3.5 source code.
38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
40 * the mrouted version on that device.
41 * Chih-Jen Chang : Added the max_resp_time parameter to
42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
43 * to identify the multicast router version
44 * and do what the IGMP version 2 specified.
45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
46 * Tsu-Sheng Tsao if the specified time expired.
47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
48 * Alan Cox : Use GFP_ATOMIC in the right places.
49 * Christian Daudt : igmp timer wasn't set for local group
50 * memberships but was being deleted,
51 * which caused a "del_timer() called
52 * from %p with timer not initialized\n"
53 * message (960131).
54 * Christian Daudt : removed del_timer from
55 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
58 * true (960216).
59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
60 * igmp_heard_query never trigger. Expiry
61 * miscalculation fixed in igmp_heard_query
62 * and random() made to return unsigned to
63 * prevent negative expiry times.
64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
65 * fix from pending 2.1.x patches.
66 * Alan Cox: Forget to enable FDDI support earlier.
67 * Alexey Kuznetsov: Fixed leaving groups on device down.
68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
69 * David L Stevens: IGMPv3 support, with help from
70 * Vinay Kulkarni
71 */
72
73 #include <linux/module.h>
74 #include <linux/slab.h>
75 #include <asm/uaccess.h>
76 #include <linux/types.h>
77 #include <linux/kernel.h>
78 #include <linux/jiffies.h>
79 #include <linux/string.h>
80 #include <linux/socket.h>
81 #include <linux/sockios.h>
82 #include <linux/in.h>
83 #include <linux/inet.h>
84 #include <linux/netdevice.h>
85 #include <linux/skbuff.h>
86 #include <linux/inetdevice.h>
87 #include <linux/igmp.h>
88 #include <linux/if_arp.h>
89 #include <linux/rtnetlink.h>
90 #include <linux/times.h>
91 #include <linux/pkt_sched.h>
92
93 #include <net/net_namespace.h>
94 #include <net/arp.h>
95 #include <net/ip.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
98 #include <net/sock.h>
99 #include <net/checksum.h>
100 #include <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 #define IP_MAX_MEMBERSHIPS 20
111 #define IP_MAX_MSF 10
112
113 /* IGMP reports for link-local multicast groups are enabled by default */
114 int sysctl_igmp_llm_reports __read_mostly = 1;
115
116 #ifdef CONFIG_IP_MULTICAST
117 /* Parameter names and values are taken from igmp-v2-06 draft */
118
119 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
120 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
121 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
122 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
123 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
124 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
125
126
127 #define IGMP_INITIAL_REPORT_DELAY (1)
128
129 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
130 * IGMP specs require to report membership immediately after
131 * joining a group, but we delay the first report by a
132 * small interval. It seems more natural and still does not
133 * contradict to specs provided this delay is small enough.
134 */
135
136 #define IGMP_V1_SEEN(in_dev) \
137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
139 ((in_dev)->mr_v1_seen && \
140 time_before(jiffies, (in_dev)->mr_v1_seen)))
141 #define IGMP_V2_SEEN(in_dev) \
142 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
143 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
144 ((in_dev)->mr_v2_seen && \
145 time_before(jiffies, (in_dev)->mr_v2_seen)))
146
147 static int unsolicited_report_interval(struct in_device *in_dev)
148 {
149 int interval_ms, interval_jiffies;
150
151 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
152 interval_ms = IN_DEV_CONF_GET(
153 in_dev,
154 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
155 else /* v3 */
156 interval_ms = IN_DEV_CONF_GET(
157 in_dev,
158 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
159
160 interval_jiffies = msecs_to_jiffies(interval_ms);
161
162 /* _timer functions can't handle a delay of 0 jiffies so ensure
163 * we always return a positive value.
164 */
165 if (interval_jiffies <= 0)
166 interval_jiffies = 1;
167 return interval_jiffies;
168 }
169
170 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
171 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
172 static void igmpv3_clear_delrec(struct in_device *in_dev);
173 static int sf_setstate(struct ip_mc_list *pmc);
174 static void sf_markstate(struct ip_mc_list *pmc);
175 #endif
176 static void ip_mc_clear_src(struct ip_mc_list *pmc);
177 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
178 int sfcount, __be32 *psfsrc, int delta);
179
180 static void ip_ma_put(struct ip_mc_list *im)
181 {
182 if (atomic_dec_and_test(&im->refcnt)) {
183 in_dev_put(im->interface);
184 kfree_rcu(im, rcu);
185 }
186 }
187
188 #define for_each_pmc_rcu(in_dev, pmc) \
189 for (pmc = rcu_dereference(in_dev->mc_list); \
190 pmc != NULL; \
191 pmc = rcu_dereference(pmc->next_rcu))
192
193 #define for_each_pmc_rtnl(in_dev, pmc) \
194 for (pmc = rtnl_dereference(in_dev->mc_list); \
195 pmc != NULL; \
196 pmc = rtnl_dereference(pmc->next_rcu))
197
198 #ifdef CONFIG_IP_MULTICAST
199
200 /*
201 * Timer management
202 */
203
204 static void igmp_stop_timer(struct ip_mc_list *im)
205 {
206 spin_lock_bh(&im->lock);
207 if (del_timer(&im->timer))
208 atomic_dec(&im->refcnt);
209 im->tm_running = 0;
210 im->reporter = 0;
211 im->unsolicit_count = 0;
212 spin_unlock_bh(&im->lock);
213 }
214
215 /* It must be called with locked im->lock */
216 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
217 {
218 int tv = prandom_u32() % max_delay;
219
220 im->tm_running = 1;
221 if (!mod_timer(&im->timer, jiffies+tv+2))
222 atomic_inc(&im->refcnt);
223 }
224
225 static void igmp_gq_start_timer(struct in_device *in_dev)
226 {
227 int tv = prandom_u32() % in_dev->mr_maxdelay;
228
229 in_dev->mr_gq_running = 1;
230 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
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 atomic_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 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
326 {
327 struct sk_buff *skb;
328 struct rtable *rt;
329 struct iphdr *pip;
330 struct igmpv3_report *pig;
331 struct net *net = dev_net(dev);
332 struct flowi4 fl4;
333 int hlen = LL_RESERVED_SPACE(dev);
334 int tlen = dev->needed_tailroom;
335 unsigned int size = mtu;
336
337 while (1) {
338 skb = alloc_skb(size + hlen + tlen,
339 GFP_ATOMIC | __GFP_NOWARN);
340 if (skb)
341 break;
342 size >>= 1;
343 if (size < 256)
344 return NULL;
345 }
346 skb->priority = TC_PRIO_CONTROL;
347
348 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
349 0, 0,
350 IPPROTO_IGMP, 0, dev->ifindex);
351 if (IS_ERR(rt)) {
352 kfree_skb(skb);
353 return NULL;
354 }
355
356 skb_dst_set(skb, &rt->dst);
357 skb->dev = dev;
358
359 skb->reserved_tailroom = skb_end_offset(skb) -
360 min(mtu, skb_end_offset(skb));
361 skb_reserve(skb, hlen);
362
363 skb_reset_network_header(skb);
364 pip = ip_hdr(skb);
365 skb_put(skb, sizeof(struct iphdr) + 4);
366
367 pip->version = 4;
368 pip->ihl = (sizeof(struct iphdr)+4)>>2;
369 pip->tos = 0xc0;
370 pip->frag_off = htons(IP_DF);
371 pip->ttl = 1;
372 pip->daddr = fl4.daddr;
373 pip->saddr = fl4.saddr;
374 pip->protocol = IPPROTO_IGMP;
375 pip->tot_len = 0; /* filled in later */
376 ip_select_ident(net, skb, NULL);
377 ((u8 *)&pip[1])[0] = IPOPT_RA;
378 ((u8 *)&pip[1])[1] = 4;
379 ((u8 *)&pip[1])[2] = 0;
380 ((u8 *)&pip[1])[3] = 0;
381
382 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
383 skb_put(skb, sizeof(*pig));
384 pig = igmpv3_report_hdr(skb);
385 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
386 pig->resv1 = 0;
387 pig->csum = 0;
388 pig->resv2 = 0;
389 pig->ngrec = 0;
390 return skb;
391 }
392
393 static int igmpv3_sendpack(struct sk_buff *skb)
394 {
395 struct igmphdr *pig = igmp_hdr(skb);
396 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
397
398 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
399
400 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
401 }
402
403 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
404 {
405 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
406 }
407
408 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
409 int type, struct igmpv3_grec **ppgr)
410 {
411 struct net_device *dev = pmc->interface->dev;
412 struct igmpv3_report *pih;
413 struct igmpv3_grec *pgr;
414
415 if (!skb)
416 skb = igmpv3_newpack(dev, dev->mtu);
417 if (!skb)
418 return NULL;
419 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
420 pgr->grec_type = type;
421 pgr->grec_auxwords = 0;
422 pgr->grec_nsrcs = 0;
423 pgr->grec_mca = pmc->multiaddr;
424 pih = igmpv3_report_hdr(skb);
425 pih->ngrec = htons(ntohs(pih->ngrec)+1);
426 *ppgr = pgr;
427 return skb;
428 }
429
430 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
431
432 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
433 int type, int gdeleted, int sdeleted)
434 {
435 struct net_device *dev = pmc->interface->dev;
436 struct igmpv3_report *pih;
437 struct igmpv3_grec *pgr = NULL;
438 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
439 int scount, stotal, first, isquery, truncate;
440
441 if (pmc->multiaddr == IGMP_ALL_HOSTS)
442 return skb;
443 if (ipv4_is_local_multicast(pmc->multiaddr) && !sysctl_igmp_llm_reports)
444 return skb;
445
446 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
447 type == IGMPV3_MODE_IS_EXCLUDE;
448 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
449 type == IGMPV3_CHANGE_TO_EXCLUDE;
450
451 stotal = scount = 0;
452
453 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
454
455 if (!*psf_list)
456 goto empty_source;
457
458 pih = skb ? igmpv3_report_hdr(skb) : NULL;
459
460 /* EX and TO_EX get a fresh packet, if needed */
461 if (truncate) {
462 if (pih && pih->ngrec &&
463 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
464 if (skb)
465 igmpv3_sendpack(skb);
466 skb = igmpv3_newpack(dev, dev->mtu);
467 }
468 }
469 first = 1;
470 psf_prev = NULL;
471 for (psf = *psf_list; psf; psf = psf_next) {
472 __be32 *psrc;
473
474 psf_next = psf->sf_next;
475
476 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
477 psf_prev = psf;
478 continue;
479 }
480
481 /* clear marks on query responses */
482 if (isquery)
483 psf->sf_gsresp = 0;
484
485 if (AVAILABLE(skb) < sizeof(__be32) +
486 first*sizeof(struct igmpv3_grec)) {
487 if (truncate && !first)
488 break; /* truncate these */
489 if (pgr)
490 pgr->grec_nsrcs = htons(scount);
491 if (skb)
492 igmpv3_sendpack(skb);
493 skb = igmpv3_newpack(dev, dev->mtu);
494 first = 1;
495 scount = 0;
496 }
497 if (first) {
498 skb = add_grhead(skb, pmc, type, &pgr);
499 first = 0;
500 }
501 if (!skb)
502 return NULL;
503 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
504 *psrc = psf->sf_inaddr;
505 scount++; stotal++;
506 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
507 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
508 psf->sf_crcount--;
509 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
510 if (psf_prev)
511 psf_prev->sf_next = psf->sf_next;
512 else
513 *psf_list = psf->sf_next;
514 kfree(psf);
515 continue;
516 }
517 }
518 psf_prev = psf;
519 }
520
521 empty_source:
522 if (!stotal) {
523 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
524 type == IGMPV3_BLOCK_OLD_SOURCES)
525 return skb;
526 if (pmc->crcount || isquery) {
527 /* make sure we have room for group header */
528 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
529 igmpv3_sendpack(skb);
530 skb = NULL; /* add_grhead will get a new one */
531 }
532 skb = add_grhead(skb, pmc, type, &pgr);
533 }
534 }
535 if (pgr)
536 pgr->grec_nsrcs = htons(scount);
537
538 if (isquery)
539 pmc->gsquery = 0; /* clear query state on report */
540 return skb;
541 }
542
543 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
544 {
545 struct sk_buff *skb = NULL;
546 int type;
547
548 if (!pmc) {
549 rcu_read_lock();
550 for_each_pmc_rcu(in_dev, pmc) {
551 if (pmc->multiaddr == IGMP_ALL_HOSTS)
552 continue;
553 if (ipv4_is_local_multicast(pmc->multiaddr) &&
554 !sysctl_igmp_llm_reports)
555 continue;
556 spin_lock_bh(&pmc->lock);
557 if (pmc->sfcount[MCAST_EXCLUDE])
558 type = IGMPV3_MODE_IS_EXCLUDE;
559 else
560 type = IGMPV3_MODE_IS_INCLUDE;
561 skb = add_grec(skb, pmc, type, 0, 0);
562 spin_unlock_bh(&pmc->lock);
563 }
564 rcu_read_unlock();
565 } else {
566 spin_lock_bh(&pmc->lock);
567 if (pmc->sfcount[MCAST_EXCLUDE])
568 type = IGMPV3_MODE_IS_EXCLUDE;
569 else
570 type = IGMPV3_MODE_IS_INCLUDE;
571 skb = add_grec(skb, pmc, type, 0, 0);
572 spin_unlock_bh(&pmc->lock);
573 }
574 if (!skb)
575 return 0;
576 return igmpv3_sendpack(skb);
577 }
578
579 /*
580 * remove zero-count source records from a source filter list
581 */
582 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
583 {
584 struct ip_sf_list *psf_prev, *psf_next, *psf;
585
586 psf_prev = NULL;
587 for (psf = *ppsf; psf; psf = psf_next) {
588 psf_next = psf->sf_next;
589 if (psf->sf_crcount == 0) {
590 if (psf_prev)
591 psf_prev->sf_next = psf->sf_next;
592 else
593 *ppsf = psf->sf_next;
594 kfree(psf);
595 } else
596 psf_prev = psf;
597 }
598 }
599
600 static void igmpv3_send_cr(struct in_device *in_dev)
601 {
602 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
603 struct sk_buff *skb = NULL;
604 int type, dtype;
605
606 rcu_read_lock();
607 spin_lock_bh(&in_dev->mc_tomb_lock);
608
609 /* deleted MCA's */
610 pmc_prev = NULL;
611 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
612 pmc_next = pmc->next;
613 if (pmc->sfmode == MCAST_INCLUDE) {
614 type = IGMPV3_BLOCK_OLD_SOURCES;
615 dtype = IGMPV3_BLOCK_OLD_SOURCES;
616 skb = add_grec(skb, pmc, type, 1, 0);
617 skb = add_grec(skb, pmc, dtype, 1, 1);
618 }
619 if (pmc->crcount) {
620 if (pmc->sfmode == MCAST_EXCLUDE) {
621 type = IGMPV3_CHANGE_TO_INCLUDE;
622 skb = add_grec(skb, pmc, type, 1, 0);
623 }
624 pmc->crcount--;
625 if (pmc->crcount == 0) {
626 igmpv3_clear_zeros(&pmc->tomb);
627 igmpv3_clear_zeros(&pmc->sources);
628 }
629 }
630 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
631 if (pmc_prev)
632 pmc_prev->next = pmc_next;
633 else
634 in_dev->mc_tomb = pmc_next;
635 in_dev_put(pmc->interface);
636 kfree(pmc);
637 } else
638 pmc_prev = pmc;
639 }
640 spin_unlock_bh(&in_dev->mc_tomb_lock);
641
642 /* change recs */
643 for_each_pmc_rcu(in_dev, pmc) {
644 spin_lock_bh(&pmc->lock);
645 if (pmc->sfcount[MCAST_EXCLUDE]) {
646 type = IGMPV3_BLOCK_OLD_SOURCES;
647 dtype = IGMPV3_ALLOW_NEW_SOURCES;
648 } else {
649 type = IGMPV3_ALLOW_NEW_SOURCES;
650 dtype = IGMPV3_BLOCK_OLD_SOURCES;
651 }
652 skb = add_grec(skb, pmc, type, 0, 0);
653 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
654
655 /* filter mode changes */
656 if (pmc->crcount) {
657 if (pmc->sfmode == MCAST_EXCLUDE)
658 type = IGMPV3_CHANGE_TO_EXCLUDE;
659 else
660 type = IGMPV3_CHANGE_TO_INCLUDE;
661 skb = add_grec(skb, pmc, type, 0, 0);
662 pmc->crcount--;
663 }
664 spin_unlock_bh(&pmc->lock);
665 }
666 rcu_read_unlock();
667
668 if (!skb)
669 return;
670 (void) igmpv3_sendpack(skb);
671 }
672
673 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
674 int type)
675 {
676 struct sk_buff *skb;
677 struct iphdr *iph;
678 struct igmphdr *ih;
679 struct rtable *rt;
680 struct net_device *dev = in_dev->dev;
681 struct net *net = dev_net(dev);
682 __be32 group = pmc ? pmc->multiaddr : 0;
683 struct flowi4 fl4;
684 __be32 dst;
685 int hlen, tlen;
686
687 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
688 return igmpv3_send_report(in_dev, pmc);
689
690 if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
691 return 0;
692
693 if (type == IGMP_HOST_LEAVE_MESSAGE)
694 dst = IGMP_ALL_ROUTER;
695 else
696 dst = group;
697
698 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
699 0, 0,
700 IPPROTO_IGMP, 0, dev->ifindex);
701 if (IS_ERR(rt))
702 return -1;
703
704 hlen = LL_RESERVED_SPACE(dev);
705 tlen = dev->needed_tailroom;
706 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
707 if (!skb) {
708 ip_rt_put(rt);
709 return -1;
710 }
711 skb->priority = TC_PRIO_CONTROL;
712
713 skb_dst_set(skb, &rt->dst);
714
715 skb_reserve(skb, hlen);
716
717 skb_reset_network_header(skb);
718 iph = ip_hdr(skb);
719 skb_put(skb, sizeof(struct iphdr) + 4);
720
721 iph->version = 4;
722 iph->ihl = (sizeof(struct iphdr)+4)>>2;
723 iph->tos = 0xc0;
724 iph->frag_off = htons(IP_DF);
725 iph->ttl = 1;
726 iph->daddr = dst;
727 iph->saddr = fl4.saddr;
728 iph->protocol = IPPROTO_IGMP;
729 ip_select_ident(net, skb, NULL);
730 ((u8 *)&iph[1])[0] = IPOPT_RA;
731 ((u8 *)&iph[1])[1] = 4;
732 ((u8 *)&iph[1])[2] = 0;
733 ((u8 *)&iph[1])[3] = 0;
734
735 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
736 ih->type = type;
737 ih->code = 0;
738 ih->csum = 0;
739 ih->group = group;
740 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
741
742 return ip_local_out(net, skb->sk, skb);
743 }
744
745 static void igmp_gq_timer_expire(unsigned long data)
746 {
747 struct in_device *in_dev = (struct in_device *)data;
748
749 in_dev->mr_gq_running = 0;
750 igmpv3_send_report(in_dev, NULL);
751 in_dev_put(in_dev);
752 }
753
754 static void igmp_ifc_timer_expire(unsigned long data)
755 {
756 struct in_device *in_dev = (struct in_device *)data;
757
758 igmpv3_send_cr(in_dev);
759 if (in_dev->mr_ifc_count) {
760 in_dev->mr_ifc_count--;
761 igmp_ifc_start_timer(in_dev,
762 unsolicited_report_interval(in_dev));
763 }
764 in_dev_put(in_dev);
765 }
766
767 static void igmp_ifc_event(struct in_device *in_dev)
768 {
769 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
770 return;
771 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
772 igmp_ifc_start_timer(in_dev, 1);
773 }
774
775
776 static void igmp_timer_expire(unsigned long data)
777 {
778 struct ip_mc_list *im = (struct ip_mc_list *)data;
779 struct in_device *in_dev = im->interface;
780
781 spin_lock(&im->lock);
782 im->tm_running = 0;
783
784 if (im->unsolicit_count) {
785 im->unsolicit_count--;
786 igmp_start_timer(im, unsolicited_report_interval(in_dev));
787 }
788 im->reporter = 1;
789 spin_unlock(&im->lock);
790
791 if (IGMP_V1_SEEN(in_dev))
792 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
793 else if (IGMP_V2_SEEN(in_dev))
794 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
795 else
796 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
797
798 ip_ma_put(im);
799 }
800
801 /* mark EXCLUDE-mode sources */
802 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
803 {
804 struct ip_sf_list *psf;
805 int i, scount;
806
807 scount = 0;
808 for (psf = pmc->sources; psf; psf = psf->sf_next) {
809 if (scount == nsrcs)
810 break;
811 for (i = 0; i < nsrcs; i++) {
812 /* skip inactive filters */
813 if (psf->sf_count[MCAST_INCLUDE] ||
814 pmc->sfcount[MCAST_EXCLUDE] !=
815 psf->sf_count[MCAST_EXCLUDE])
816 break;
817 if (srcs[i] == psf->sf_inaddr) {
818 scount++;
819 break;
820 }
821 }
822 }
823 pmc->gsquery = 0;
824 if (scount == nsrcs) /* all sources excluded */
825 return 0;
826 return 1;
827 }
828
829 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
830 {
831 struct ip_sf_list *psf;
832 int i, scount;
833
834 if (pmc->sfmode == MCAST_EXCLUDE)
835 return igmp_xmarksources(pmc, nsrcs, srcs);
836
837 /* mark INCLUDE-mode sources */
838 scount = 0;
839 for (psf = pmc->sources; psf; psf = psf->sf_next) {
840 if (scount == nsrcs)
841 break;
842 for (i = 0; i < nsrcs; i++)
843 if (srcs[i] == psf->sf_inaddr) {
844 psf->sf_gsresp = 1;
845 scount++;
846 break;
847 }
848 }
849 if (!scount) {
850 pmc->gsquery = 0;
851 return 0;
852 }
853 pmc->gsquery = 1;
854 return 1;
855 }
856
857 /* return true if packet was dropped */
858 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
859 {
860 struct ip_mc_list *im;
861
862 /* Timers are only set for non-local groups */
863
864 if (group == IGMP_ALL_HOSTS)
865 return false;
866 if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
867 return false;
868
869 rcu_read_lock();
870 for_each_pmc_rcu(in_dev, im) {
871 if (im->multiaddr == group) {
872 igmp_stop_timer(im);
873 break;
874 }
875 }
876 rcu_read_unlock();
877 return false;
878 }
879
880 /* return true if packet was dropped */
881 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
882 int len)
883 {
884 struct igmphdr *ih = igmp_hdr(skb);
885 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
886 struct ip_mc_list *im;
887 __be32 group = ih->group;
888 int max_delay;
889 int mark = 0;
890
891
892 if (len == 8) {
893 if (ih->code == 0) {
894 /* Alas, old v1 router presents here. */
895
896 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
897 in_dev->mr_v1_seen = jiffies +
898 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
899 group = 0;
900 } else {
901 /* v2 router present */
902 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
903 in_dev->mr_v2_seen = jiffies +
904 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
905 }
906 /* cancel the interface change timer */
907 in_dev->mr_ifc_count = 0;
908 if (del_timer(&in_dev->mr_ifc_timer))
909 __in_dev_put(in_dev);
910 /* clear deleted report items */
911 igmpv3_clear_delrec(in_dev);
912 } else if (len < 12) {
913 return true; /* ignore bogus packet; freed by caller */
914 } else if (IGMP_V1_SEEN(in_dev)) {
915 /* This is a v3 query with v1 queriers present */
916 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
917 group = 0;
918 } else if (IGMP_V2_SEEN(in_dev)) {
919 /* this is a v3 query with v2 queriers present;
920 * Interpretation of the max_delay code is problematic here.
921 * A real v2 host would use ih_code directly, while v3 has a
922 * different encoding. We use the v3 encoding as more likely
923 * to be intended in a v3 query.
924 */
925 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
926 if (!max_delay)
927 max_delay = 1; /* can't mod w/ 0 */
928 } else { /* v3 */
929 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
930 return true;
931
932 ih3 = igmpv3_query_hdr(skb);
933 if (ih3->nsrcs) {
934 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
935 + ntohs(ih3->nsrcs)*sizeof(__be32)))
936 return true;
937 ih3 = igmpv3_query_hdr(skb);
938 }
939
940 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
941 if (!max_delay)
942 max_delay = 1; /* can't mod w/ 0 */
943 in_dev->mr_maxdelay = max_delay;
944 if (ih3->qrv)
945 in_dev->mr_qrv = ih3->qrv;
946 if (!group) { /* general query */
947 if (ih3->nsrcs)
948 return true; /* no sources allowed */
949 igmp_gq_start_timer(in_dev);
950 return false;
951 }
952 /* mark sources to include, if group & source-specific */
953 mark = ih3->nsrcs != 0;
954 }
955
956 /*
957 * - Start the timers in all of our membership records
958 * that the query applies to for the interface on
959 * which the query arrived excl. those that belong
960 * to a "local" group (224.0.0.X)
961 * - For timers already running check if they need to
962 * be reset.
963 * - Use the igmp->igmp_code field as the maximum
964 * delay possible
965 */
966 rcu_read_lock();
967 for_each_pmc_rcu(in_dev, im) {
968 int changed;
969
970 if (group && group != im->multiaddr)
971 continue;
972 if (im->multiaddr == IGMP_ALL_HOSTS)
973 continue;
974 if (ipv4_is_local_multicast(im->multiaddr) &&
975 !sysctl_igmp_llm_reports)
976 continue;
977 spin_lock_bh(&im->lock);
978 if (im->tm_running)
979 im->gsquery = im->gsquery && mark;
980 else
981 im->gsquery = mark;
982 changed = !im->gsquery ||
983 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
984 spin_unlock_bh(&im->lock);
985 if (changed)
986 igmp_mod_timer(im, max_delay);
987 }
988 rcu_read_unlock();
989 return false;
990 }
991
992 /* called in rcu_read_lock() section */
993 int igmp_rcv(struct sk_buff *skb)
994 {
995 /* This basically follows the spec line by line -- see RFC1112 */
996 struct igmphdr *ih;
997 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
998 int len = skb->len;
999 bool dropped = true;
1000
1001 if (!in_dev)
1002 goto drop;
1003
1004 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1005 goto drop;
1006
1007 if (skb_checksum_simple_validate(skb))
1008 goto drop;
1009
1010 ih = igmp_hdr(skb);
1011 switch (ih->type) {
1012 case IGMP_HOST_MEMBERSHIP_QUERY:
1013 dropped = igmp_heard_query(in_dev, skb, len);
1014 break;
1015 case IGMP_HOST_MEMBERSHIP_REPORT:
1016 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1017 /* Is it our report looped back? */
1018 if (rt_is_output_route(skb_rtable(skb)))
1019 break;
1020 /* don't rely on MC router hearing unicast reports */
1021 if (skb->pkt_type == PACKET_MULTICAST ||
1022 skb->pkt_type == PACKET_BROADCAST)
1023 dropped = igmp_heard_report(in_dev, ih->group);
1024 break;
1025 case IGMP_PIM:
1026 #ifdef CONFIG_IP_PIMSM_V1
1027 return pim_rcv_v1(skb);
1028 #endif
1029 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1030 case IGMP_DVMRP:
1031 case IGMP_TRACE:
1032 case IGMP_HOST_LEAVE_MESSAGE:
1033 case IGMP_MTRACE:
1034 case IGMP_MTRACE_RESP:
1035 break;
1036 default:
1037 break;
1038 }
1039
1040 drop:
1041 if (dropped)
1042 kfree_skb(skb);
1043 else
1044 consume_skb(skb);
1045 return 0;
1046 }
1047
1048 #endif
1049
1050
1051 /*
1052 * Add a filter to a device
1053 */
1054
1055 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1056 {
1057 char buf[MAX_ADDR_LEN];
1058 struct net_device *dev = in_dev->dev;
1059
1060 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1061 We will get multicast token leakage, when IFF_MULTICAST
1062 is changed. This check should be done in ndo_set_rx_mode
1063 routine. Something sort of:
1064 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1065 --ANK
1066 */
1067 if (arp_mc_map(addr, buf, dev, 0) == 0)
1068 dev_mc_add(dev, buf);
1069 }
1070
1071 /*
1072 * Remove a filter from a device
1073 */
1074
1075 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1076 {
1077 char buf[MAX_ADDR_LEN];
1078 struct net_device *dev = in_dev->dev;
1079
1080 if (arp_mc_map(addr, buf, dev, 0) == 0)
1081 dev_mc_del(dev, buf);
1082 }
1083
1084 #ifdef CONFIG_IP_MULTICAST
1085 /*
1086 * deleted ip_mc_list manipulation
1087 */
1088 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1089 {
1090 struct ip_mc_list *pmc;
1091
1092 /* this is an "ip_mc_list" for convenience; only the fields below
1093 * are actually used. In particular, the refcnt and users are not
1094 * used for management of the delete list. Using the same structure
1095 * for deleted items allows change reports to use common code with
1096 * non-deleted or query-response MCA's.
1097 */
1098 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1099 if (!pmc)
1100 return;
1101 spin_lock_bh(&im->lock);
1102 pmc->interface = im->interface;
1103 in_dev_hold(in_dev);
1104 pmc->multiaddr = im->multiaddr;
1105 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1106 pmc->sfmode = im->sfmode;
1107 if (pmc->sfmode == MCAST_INCLUDE) {
1108 struct ip_sf_list *psf;
1109
1110 pmc->tomb = im->tomb;
1111 pmc->sources = im->sources;
1112 im->tomb = im->sources = NULL;
1113 for (psf = pmc->sources; psf; psf = psf->sf_next)
1114 psf->sf_crcount = pmc->crcount;
1115 }
1116 spin_unlock_bh(&im->lock);
1117
1118 spin_lock_bh(&in_dev->mc_tomb_lock);
1119 pmc->next = in_dev->mc_tomb;
1120 in_dev->mc_tomb = pmc;
1121 spin_unlock_bh(&in_dev->mc_tomb_lock);
1122 }
1123
1124 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1125 {
1126 struct ip_mc_list *pmc, *pmc_prev;
1127 struct ip_sf_list *psf, *psf_next;
1128
1129 spin_lock_bh(&in_dev->mc_tomb_lock);
1130 pmc_prev = NULL;
1131 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1132 if (pmc->multiaddr == multiaddr)
1133 break;
1134 pmc_prev = pmc;
1135 }
1136 if (pmc) {
1137 if (pmc_prev)
1138 pmc_prev->next = pmc->next;
1139 else
1140 in_dev->mc_tomb = pmc->next;
1141 }
1142 spin_unlock_bh(&in_dev->mc_tomb_lock);
1143 if (pmc) {
1144 for (psf = pmc->tomb; psf; psf = psf_next) {
1145 psf_next = psf->sf_next;
1146 kfree(psf);
1147 }
1148 in_dev_put(pmc->interface);
1149 kfree(pmc);
1150 }
1151 }
1152
1153 static void igmpv3_clear_delrec(struct in_device *in_dev)
1154 {
1155 struct ip_mc_list *pmc, *nextpmc;
1156
1157 spin_lock_bh(&in_dev->mc_tomb_lock);
1158 pmc = in_dev->mc_tomb;
1159 in_dev->mc_tomb = NULL;
1160 spin_unlock_bh(&in_dev->mc_tomb_lock);
1161
1162 for (; pmc; pmc = nextpmc) {
1163 nextpmc = pmc->next;
1164 ip_mc_clear_src(pmc);
1165 in_dev_put(pmc->interface);
1166 kfree(pmc);
1167 }
1168 /* clear dead sources, too */
1169 rcu_read_lock();
1170 for_each_pmc_rcu(in_dev, pmc) {
1171 struct ip_sf_list *psf, *psf_next;
1172
1173 spin_lock_bh(&pmc->lock);
1174 psf = pmc->tomb;
1175 pmc->tomb = NULL;
1176 spin_unlock_bh(&pmc->lock);
1177 for (; psf; psf = psf_next) {
1178 psf_next = psf->sf_next;
1179 kfree(psf);
1180 }
1181 }
1182 rcu_read_unlock();
1183 }
1184 #endif
1185
1186 static void igmp_group_dropped(struct ip_mc_list *im)
1187 {
1188 struct in_device *in_dev = im->interface;
1189 #ifdef CONFIG_IP_MULTICAST
1190 int reporter;
1191 #endif
1192
1193 if (im->loaded) {
1194 im->loaded = 0;
1195 ip_mc_filter_del(in_dev, im->multiaddr);
1196 }
1197
1198 #ifdef CONFIG_IP_MULTICAST
1199 if (im->multiaddr == IGMP_ALL_HOSTS)
1200 return;
1201 if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports)
1202 return;
1203
1204 reporter = im->reporter;
1205 igmp_stop_timer(im);
1206
1207 if (!in_dev->dead) {
1208 if (IGMP_V1_SEEN(in_dev))
1209 return;
1210 if (IGMP_V2_SEEN(in_dev)) {
1211 if (reporter)
1212 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1213 return;
1214 }
1215 /* IGMPv3 */
1216 igmpv3_add_delrec(in_dev, im);
1217
1218 igmp_ifc_event(in_dev);
1219 }
1220 #endif
1221 }
1222
1223 static void igmp_group_added(struct ip_mc_list *im)
1224 {
1225 struct in_device *in_dev = im->interface;
1226
1227 if (im->loaded == 0) {
1228 im->loaded = 1;
1229 ip_mc_filter_add(in_dev, im->multiaddr);
1230 }
1231
1232 #ifdef CONFIG_IP_MULTICAST
1233 if (im->multiaddr == IGMP_ALL_HOSTS)
1234 return;
1235 if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports)
1236 return;
1237
1238 if (in_dev->dead)
1239 return;
1240 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1241 spin_lock_bh(&im->lock);
1242 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1243 spin_unlock_bh(&im->lock);
1244 return;
1245 }
1246 /* else, v3 */
1247
1248 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1249 igmp_ifc_event(in_dev);
1250 #endif
1251 }
1252
1253
1254 /*
1255 * Multicast list managers
1256 */
1257
1258 static u32 ip_mc_hash(const struct ip_mc_list *im)
1259 {
1260 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1261 }
1262
1263 static void ip_mc_hash_add(struct in_device *in_dev,
1264 struct ip_mc_list *im)
1265 {
1266 struct ip_mc_list __rcu **mc_hash;
1267 u32 hash;
1268
1269 mc_hash = rtnl_dereference(in_dev->mc_hash);
1270 if (mc_hash) {
1271 hash = ip_mc_hash(im);
1272 im->next_hash = mc_hash[hash];
1273 rcu_assign_pointer(mc_hash[hash], im);
1274 return;
1275 }
1276
1277 /* do not use a hash table for small number of items */
1278 if (in_dev->mc_count < 4)
1279 return;
1280
1281 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1282 GFP_KERNEL);
1283 if (!mc_hash)
1284 return;
1285
1286 for_each_pmc_rtnl(in_dev, im) {
1287 hash = ip_mc_hash(im);
1288 im->next_hash = mc_hash[hash];
1289 RCU_INIT_POINTER(mc_hash[hash], im);
1290 }
1291
1292 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1293 }
1294
1295 static void ip_mc_hash_remove(struct in_device *in_dev,
1296 struct ip_mc_list *im)
1297 {
1298 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1299 struct ip_mc_list *aux;
1300
1301 if (!mc_hash)
1302 return;
1303 mc_hash += ip_mc_hash(im);
1304 while ((aux = rtnl_dereference(*mc_hash)) != im)
1305 mc_hash = &aux->next_hash;
1306 *mc_hash = im->next_hash;
1307 }
1308
1309
1310 /*
1311 * A socket has joined a multicast group on device dev.
1312 */
1313
1314 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1315 {
1316 struct ip_mc_list *im;
1317
1318 ASSERT_RTNL();
1319
1320 for_each_pmc_rtnl(in_dev, im) {
1321 if (im->multiaddr == addr) {
1322 im->users++;
1323 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1324 goto out;
1325 }
1326 }
1327
1328 im = kzalloc(sizeof(*im), GFP_KERNEL);
1329 if (!im)
1330 goto out;
1331
1332 im->users = 1;
1333 im->interface = in_dev;
1334 in_dev_hold(in_dev);
1335 im->multiaddr = addr;
1336 /* initial mode is (EX, empty) */
1337 im->sfmode = MCAST_EXCLUDE;
1338 im->sfcount[MCAST_EXCLUDE] = 1;
1339 atomic_set(&im->refcnt, 1);
1340 spin_lock_init(&im->lock);
1341 #ifdef CONFIG_IP_MULTICAST
1342 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1343 im->unsolicit_count = sysctl_igmp_qrv;
1344 #endif
1345
1346 im->next_rcu = in_dev->mc_list;
1347 in_dev->mc_count++;
1348 rcu_assign_pointer(in_dev->mc_list, im);
1349
1350 ip_mc_hash_add(in_dev, im);
1351
1352 #ifdef CONFIG_IP_MULTICAST
1353 igmpv3_del_delrec(in_dev, im->multiaddr);
1354 #endif
1355 igmp_group_added(im);
1356 if (!in_dev->dead)
1357 ip_rt_multicast_event(in_dev);
1358 out:
1359 return;
1360 }
1361 EXPORT_SYMBOL(ip_mc_inc_group);
1362
1363 static int ip_mc_check_iphdr(struct sk_buff *skb)
1364 {
1365 const struct iphdr *iph;
1366 unsigned int len;
1367 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1368
1369 if (!pskb_may_pull(skb, offset))
1370 return -EINVAL;
1371
1372 iph = ip_hdr(skb);
1373
1374 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1375 return -EINVAL;
1376
1377 offset += ip_hdrlen(skb) - sizeof(*iph);
1378
1379 if (!pskb_may_pull(skb, offset))
1380 return -EINVAL;
1381
1382 iph = ip_hdr(skb);
1383
1384 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1385 return -EINVAL;
1386
1387 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1388 if (skb->len < len || len < offset)
1389 return -EINVAL;
1390
1391 skb_set_transport_header(skb, offset);
1392
1393 return 0;
1394 }
1395
1396 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1397 {
1398 unsigned int len = skb_transport_offset(skb);
1399
1400 len += sizeof(struct igmpv3_report);
1401
1402 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1403 }
1404
1405 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1406 {
1407 unsigned int len = skb_transport_offset(skb);
1408
1409 len += sizeof(struct igmphdr);
1410 if (skb->len < len)
1411 return -EINVAL;
1412
1413 /* IGMPv{1,2}? */
1414 if (skb->len != len) {
1415 /* or IGMPv3? */
1416 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1417 if (skb->len < len || !pskb_may_pull(skb, len))
1418 return -EINVAL;
1419 }
1420
1421 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1422 * all-systems destination addresses (224.0.0.1) for general queries
1423 */
1424 if (!igmp_hdr(skb)->group &&
1425 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1426 return -EINVAL;
1427
1428 return 0;
1429 }
1430
1431 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1432 {
1433 switch (igmp_hdr(skb)->type) {
1434 case IGMP_HOST_LEAVE_MESSAGE:
1435 case IGMP_HOST_MEMBERSHIP_REPORT:
1436 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1437 /* fall through */
1438 return 0;
1439 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1440 return ip_mc_check_igmp_reportv3(skb);
1441 case IGMP_HOST_MEMBERSHIP_QUERY:
1442 return ip_mc_check_igmp_query(skb);
1443 default:
1444 return -ENOMSG;
1445 }
1446 }
1447
1448 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1449 {
1450 return skb_checksum_simple_validate(skb);
1451 }
1452
1453 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1454
1455 {
1456 struct sk_buff *skb_chk;
1457 unsigned int transport_len;
1458 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1459 int ret = -EINVAL;
1460
1461 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1462
1463 skb_chk = skb_checksum_trimmed(skb, transport_len,
1464 ip_mc_validate_checksum);
1465 if (!skb_chk)
1466 goto err;
1467
1468 if (!pskb_may_pull(skb_chk, len))
1469 goto err;
1470
1471 ret = ip_mc_check_igmp_msg(skb_chk);
1472 if (ret)
1473 goto err;
1474
1475 if (skb_trimmed)
1476 *skb_trimmed = skb_chk;
1477 /* free now unneeded clone */
1478 else if (skb_chk != skb)
1479 kfree_skb(skb_chk);
1480
1481 ret = 0;
1482
1483 err:
1484 if (ret && skb_chk && skb_chk != skb)
1485 kfree_skb(skb_chk);
1486
1487 return ret;
1488 }
1489
1490 /**
1491 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1492 * @skb: the skb to validate
1493 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1494 *
1495 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1496 * skb transport header accordingly and returns zero.
1497 *
1498 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1499 * standard
1500 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1501 * -ENOMEM: A memory allocation failure happened.
1502 *
1503 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1504 * to NULL): After parsing an IGMP packet successfully it will point to
1505 * an skb which has its tail aligned to the IP packet end. This might
1506 * either be the originally provided skb or a trimmed, cloned version if
1507 * the skb frame had data beyond the IP packet. A cloned skb allows us
1508 * to leave the original skb and its full frame unchanged (which might be
1509 * desirable for layer 2 frame jugglers).
1510 *
1511 * Caller needs to set the skb network header and free any returned skb if it
1512 * differs from the provided skb.
1513 */
1514 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1515 {
1516 int ret = ip_mc_check_iphdr(skb);
1517
1518 if (ret < 0)
1519 return ret;
1520
1521 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1522 return -ENOMSG;
1523
1524 return __ip_mc_check_igmp(skb, skb_trimmed);
1525 }
1526 EXPORT_SYMBOL(ip_mc_check_igmp);
1527
1528 /*
1529 * Resend IGMP JOIN report; used by netdev notifier.
1530 */
1531 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1532 {
1533 #ifdef CONFIG_IP_MULTICAST
1534 struct ip_mc_list *im;
1535 int type;
1536
1537 ASSERT_RTNL();
1538
1539 for_each_pmc_rtnl(in_dev, im) {
1540 if (im->multiaddr == IGMP_ALL_HOSTS)
1541 continue;
1542 if (ipv4_is_local_multicast(im->multiaddr) &&
1543 !sysctl_igmp_llm_reports)
1544 continue;
1545
1546 /* a failover is happening and switches
1547 * must be notified immediately
1548 */
1549 if (IGMP_V1_SEEN(in_dev))
1550 type = IGMP_HOST_MEMBERSHIP_REPORT;
1551 else if (IGMP_V2_SEEN(in_dev))
1552 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1553 else
1554 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1555 igmp_send_report(in_dev, im, type);
1556 }
1557 #endif
1558 }
1559
1560 /*
1561 * A socket has left a multicast group on device dev
1562 */
1563
1564 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1565 {
1566 struct ip_mc_list *i;
1567 struct ip_mc_list __rcu **ip;
1568
1569 ASSERT_RTNL();
1570
1571 for (ip = &in_dev->mc_list;
1572 (i = rtnl_dereference(*ip)) != NULL;
1573 ip = &i->next_rcu) {
1574 if (i->multiaddr == addr) {
1575 if (--i->users == 0) {
1576 ip_mc_hash_remove(in_dev, i);
1577 *ip = i->next_rcu;
1578 in_dev->mc_count--;
1579 igmp_group_dropped(i);
1580 ip_mc_clear_src(i);
1581
1582 if (!in_dev->dead)
1583 ip_rt_multicast_event(in_dev);
1584
1585 ip_ma_put(i);
1586 return;
1587 }
1588 break;
1589 }
1590 }
1591 }
1592 EXPORT_SYMBOL(ip_mc_dec_group);
1593
1594 /* Device changing type */
1595
1596 void ip_mc_unmap(struct in_device *in_dev)
1597 {
1598 struct ip_mc_list *pmc;
1599
1600 ASSERT_RTNL();
1601
1602 for_each_pmc_rtnl(in_dev, pmc)
1603 igmp_group_dropped(pmc);
1604 }
1605
1606 void ip_mc_remap(struct in_device *in_dev)
1607 {
1608 struct ip_mc_list *pmc;
1609
1610 ASSERT_RTNL();
1611
1612 for_each_pmc_rtnl(in_dev, pmc)
1613 igmp_group_added(pmc);
1614 }
1615
1616 /* Device going down */
1617
1618 void ip_mc_down(struct in_device *in_dev)
1619 {
1620 struct ip_mc_list *pmc;
1621
1622 ASSERT_RTNL();
1623
1624 for_each_pmc_rtnl(in_dev, pmc)
1625 igmp_group_dropped(pmc);
1626
1627 #ifdef CONFIG_IP_MULTICAST
1628 in_dev->mr_ifc_count = 0;
1629 if (del_timer(&in_dev->mr_ifc_timer))
1630 __in_dev_put(in_dev);
1631 in_dev->mr_gq_running = 0;
1632 if (del_timer(&in_dev->mr_gq_timer))
1633 __in_dev_put(in_dev);
1634 igmpv3_clear_delrec(in_dev);
1635 #endif
1636
1637 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1638 }
1639
1640 void ip_mc_init_dev(struct in_device *in_dev)
1641 {
1642 ASSERT_RTNL();
1643
1644 #ifdef CONFIG_IP_MULTICAST
1645 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1646 (unsigned long)in_dev);
1647 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1648 (unsigned long)in_dev);
1649 in_dev->mr_qrv = sysctl_igmp_qrv;
1650 #endif
1651
1652 spin_lock_init(&in_dev->mc_tomb_lock);
1653 }
1654
1655 /* Device going up */
1656
1657 void ip_mc_up(struct in_device *in_dev)
1658 {
1659 struct ip_mc_list *pmc;
1660
1661 ASSERT_RTNL();
1662
1663 #ifdef CONFIG_IP_MULTICAST
1664 in_dev->mr_qrv = sysctl_igmp_qrv;
1665 #endif
1666 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1667
1668 for_each_pmc_rtnl(in_dev, pmc)
1669 igmp_group_added(pmc);
1670 }
1671
1672 /*
1673 * Device is about to be destroyed: clean up.
1674 */
1675
1676 void ip_mc_destroy_dev(struct in_device *in_dev)
1677 {
1678 struct ip_mc_list *i;
1679
1680 ASSERT_RTNL();
1681
1682 /* Deactivate timers */
1683 ip_mc_down(in_dev);
1684
1685 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1686 in_dev->mc_list = i->next_rcu;
1687 in_dev->mc_count--;
1688
1689 /* We've dropped the groups in ip_mc_down already */
1690 ip_mc_clear_src(i);
1691 ip_ma_put(i);
1692 }
1693 }
1694
1695 /* RTNL is locked */
1696 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1697 {
1698 struct net_device *dev = NULL;
1699 struct in_device *idev = NULL;
1700
1701 if (imr->imr_ifindex) {
1702 idev = inetdev_by_index(net, imr->imr_ifindex);
1703 return idev;
1704 }
1705 if (imr->imr_address.s_addr) {
1706 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1707 if (!dev)
1708 return NULL;
1709 }
1710
1711 if (!dev) {
1712 struct rtable *rt = ip_route_output(net,
1713 imr->imr_multiaddr.s_addr,
1714 0, 0, 0);
1715 if (!IS_ERR(rt)) {
1716 dev = rt->dst.dev;
1717 ip_rt_put(rt);
1718 }
1719 }
1720 if (dev) {
1721 imr->imr_ifindex = dev->ifindex;
1722 idev = __in_dev_get_rtnl(dev);
1723 }
1724 return idev;
1725 }
1726
1727 /*
1728 * Join a socket to a group
1729 */
1730 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1731 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1732 #ifdef CONFIG_IP_MULTICAST
1733 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
1734 #endif
1735
1736 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1737 __be32 *psfsrc)
1738 {
1739 struct ip_sf_list *psf, *psf_prev;
1740 int rv = 0;
1741
1742 psf_prev = NULL;
1743 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1744 if (psf->sf_inaddr == *psfsrc)
1745 break;
1746 psf_prev = psf;
1747 }
1748 if (!psf || psf->sf_count[sfmode] == 0) {
1749 /* source filter not found, or count wrong => bug */
1750 return -ESRCH;
1751 }
1752 psf->sf_count[sfmode]--;
1753 if (psf->sf_count[sfmode] == 0) {
1754 ip_rt_multicast_event(pmc->interface);
1755 }
1756 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1757 #ifdef CONFIG_IP_MULTICAST
1758 struct in_device *in_dev = pmc->interface;
1759 #endif
1760
1761 /* no more filters for this source */
1762 if (psf_prev)
1763 psf_prev->sf_next = psf->sf_next;
1764 else
1765 pmc->sources = psf->sf_next;
1766 #ifdef CONFIG_IP_MULTICAST
1767 if (psf->sf_oldin &&
1768 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1769 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1770 psf->sf_next = pmc->tomb;
1771 pmc->tomb = psf;
1772 rv = 1;
1773 } else
1774 #endif
1775 kfree(psf);
1776 }
1777 return rv;
1778 }
1779
1780 #ifndef CONFIG_IP_MULTICAST
1781 #define igmp_ifc_event(x) do { } while (0)
1782 #endif
1783
1784 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1785 int sfcount, __be32 *psfsrc, int delta)
1786 {
1787 struct ip_mc_list *pmc;
1788 int changerec = 0;
1789 int i, err;
1790
1791 if (!in_dev)
1792 return -ENODEV;
1793 rcu_read_lock();
1794 for_each_pmc_rcu(in_dev, pmc) {
1795 if (*pmca == pmc->multiaddr)
1796 break;
1797 }
1798 if (!pmc) {
1799 /* MCA not found?? bug */
1800 rcu_read_unlock();
1801 return -ESRCH;
1802 }
1803 spin_lock_bh(&pmc->lock);
1804 rcu_read_unlock();
1805 #ifdef CONFIG_IP_MULTICAST
1806 sf_markstate(pmc);
1807 #endif
1808 if (!delta) {
1809 err = -EINVAL;
1810 if (!pmc->sfcount[sfmode])
1811 goto out_unlock;
1812 pmc->sfcount[sfmode]--;
1813 }
1814 err = 0;
1815 for (i = 0; i < sfcount; i++) {
1816 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1817
1818 changerec |= rv > 0;
1819 if (!err && rv < 0)
1820 err = rv;
1821 }
1822 if (pmc->sfmode == MCAST_EXCLUDE &&
1823 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1824 pmc->sfcount[MCAST_INCLUDE]) {
1825 #ifdef CONFIG_IP_MULTICAST
1826 struct ip_sf_list *psf;
1827 #endif
1828
1829 /* filter mode change */
1830 pmc->sfmode = MCAST_INCLUDE;
1831 #ifdef CONFIG_IP_MULTICAST
1832 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1833 in_dev->mr_ifc_count = pmc->crcount;
1834 for (psf = pmc->sources; psf; psf = psf->sf_next)
1835 psf->sf_crcount = 0;
1836 igmp_ifc_event(pmc->interface);
1837 } else if (sf_setstate(pmc) || changerec) {
1838 igmp_ifc_event(pmc->interface);
1839 #endif
1840 }
1841 out_unlock:
1842 spin_unlock_bh(&pmc->lock);
1843 return err;
1844 }
1845
1846 /*
1847 * Add multicast single-source filter to the interface list
1848 */
1849 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1850 __be32 *psfsrc)
1851 {
1852 struct ip_sf_list *psf, *psf_prev;
1853
1854 psf_prev = NULL;
1855 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1856 if (psf->sf_inaddr == *psfsrc)
1857 break;
1858 psf_prev = psf;
1859 }
1860 if (!psf) {
1861 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1862 if (!psf)
1863 return -ENOBUFS;
1864 psf->sf_inaddr = *psfsrc;
1865 if (psf_prev) {
1866 psf_prev->sf_next = psf;
1867 } else
1868 pmc->sources = psf;
1869 }
1870 psf->sf_count[sfmode]++;
1871 if (psf->sf_count[sfmode] == 1) {
1872 ip_rt_multicast_event(pmc->interface);
1873 }
1874 return 0;
1875 }
1876
1877 #ifdef CONFIG_IP_MULTICAST
1878 static void sf_markstate(struct ip_mc_list *pmc)
1879 {
1880 struct ip_sf_list *psf;
1881 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1882
1883 for (psf = pmc->sources; psf; psf = psf->sf_next)
1884 if (pmc->sfcount[MCAST_EXCLUDE]) {
1885 psf->sf_oldin = mca_xcount ==
1886 psf->sf_count[MCAST_EXCLUDE] &&
1887 !psf->sf_count[MCAST_INCLUDE];
1888 } else
1889 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1890 }
1891
1892 static int sf_setstate(struct ip_mc_list *pmc)
1893 {
1894 struct ip_sf_list *psf, *dpsf;
1895 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1896 int qrv = pmc->interface->mr_qrv;
1897 int new_in, rv;
1898
1899 rv = 0;
1900 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1901 if (pmc->sfcount[MCAST_EXCLUDE]) {
1902 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1903 !psf->sf_count[MCAST_INCLUDE];
1904 } else
1905 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1906 if (new_in) {
1907 if (!psf->sf_oldin) {
1908 struct ip_sf_list *prev = NULL;
1909
1910 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1911 if (dpsf->sf_inaddr == psf->sf_inaddr)
1912 break;
1913 prev = dpsf;
1914 }
1915 if (dpsf) {
1916 if (prev)
1917 prev->sf_next = dpsf->sf_next;
1918 else
1919 pmc->tomb = dpsf->sf_next;
1920 kfree(dpsf);
1921 }
1922 psf->sf_crcount = qrv;
1923 rv++;
1924 }
1925 } else if (psf->sf_oldin) {
1926
1927 psf->sf_crcount = 0;
1928 /*
1929 * add or update "delete" records if an active filter
1930 * is now inactive
1931 */
1932 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1933 if (dpsf->sf_inaddr == psf->sf_inaddr)
1934 break;
1935 if (!dpsf) {
1936 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1937 if (!dpsf)
1938 continue;
1939 *dpsf = *psf;
1940 /* pmc->lock held by callers */
1941 dpsf->sf_next = pmc->tomb;
1942 pmc->tomb = dpsf;
1943 }
1944 dpsf->sf_crcount = qrv;
1945 rv++;
1946 }
1947 }
1948 return rv;
1949 }
1950 #endif
1951
1952 /*
1953 * Add multicast source filter list to the interface list
1954 */
1955 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1956 int sfcount, __be32 *psfsrc, int delta)
1957 {
1958 struct ip_mc_list *pmc;
1959 int isexclude;
1960 int i, err;
1961
1962 if (!in_dev)
1963 return -ENODEV;
1964 rcu_read_lock();
1965 for_each_pmc_rcu(in_dev, pmc) {
1966 if (*pmca == pmc->multiaddr)
1967 break;
1968 }
1969 if (!pmc) {
1970 /* MCA not found?? bug */
1971 rcu_read_unlock();
1972 return -ESRCH;
1973 }
1974 spin_lock_bh(&pmc->lock);
1975 rcu_read_unlock();
1976
1977 #ifdef CONFIG_IP_MULTICAST
1978 sf_markstate(pmc);
1979 #endif
1980 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1981 if (!delta)
1982 pmc->sfcount[sfmode]++;
1983 err = 0;
1984 for (i = 0; i < sfcount; i++) {
1985 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1986 if (err)
1987 break;
1988 }
1989 if (err) {
1990 int j;
1991
1992 if (!delta)
1993 pmc->sfcount[sfmode]--;
1994 for (j = 0; j < i; j++)
1995 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1996 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1997 #ifdef CONFIG_IP_MULTICAST
1998 struct ip_sf_list *psf;
1999 in_dev = pmc->interface;
2000 #endif
2001
2002 /* filter mode change */
2003 if (pmc->sfcount[MCAST_EXCLUDE])
2004 pmc->sfmode = MCAST_EXCLUDE;
2005 else if (pmc->sfcount[MCAST_INCLUDE])
2006 pmc->sfmode = MCAST_INCLUDE;
2007 #ifdef CONFIG_IP_MULTICAST
2008 /* else no filters; keep old mode for reports */
2009
2010 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
2011 in_dev->mr_ifc_count = pmc->crcount;
2012 for (psf = pmc->sources; psf; psf = psf->sf_next)
2013 psf->sf_crcount = 0;
2014 igmp_ifc_event(in_dev);
2015 } else if (sf_setstate(pmc)) {
2016 igmp_ifc_event(in_dev);
2017 #endif
2018 }
2019 spin_unlock_bh(&pmc->lock);
2020 return err;
2021 }
2022
2023 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2024 {
2025 struct ip_sf_list *psf, *nextpsf;
2026
2027 for (psf = pmc->tomb; psf; psf = nextpsf) {
2028 nextpsf = psf->sf_next;
2029 kfree(psf);
2030 }
2031 pmc->tomb = NULL;
2032 for (psf = pmc->sources; psf; psf = nextpsf) {
2033 nextpsf = psf->sf_next;
2034 kfree(psf);
2035 }
2036 pmc->sources = NULL;
2037 pmc->sfmode = MCAST_EXCLUDE;
2038 pmc->sfcount[MCAST_INCLUDE] = 0;
2039 pmc->sfcount[MCAST_EXCLUDE] = 1;
2040 }
2041
2042 /* Join a multicast group
2043 */
2044
2045 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2046 {
2047 __be32 addr = imr->imr_multiaddr.s_addr;
2048 struct ip_mc_socklist *iml, *i;
2049 struct in_device *in_dev;
2050 struct inet_sock *inet = inet_sk(sk);
2051 struct net *net = sock_net(sk);
2052 int ifindex;
2053 int count = 0;
2054 int err;
2055
2056 ASSERT_RTNL();
2057
2058 if (!ipv4_is_multicast(addr))
2059 return -EINVAL;
2060
2061 in_dev = ip_mc_find_dev(net, imr);
2062
2063 if (!in_dev) {
2064 err = -ENODEV;
2065 goto done;
2066 }
2067
2068 err = -EADDRINUSE;
2069 ifindex = imr->imr_ifindex;
2070 for_each_pmc_rtnl(inet, i) {
2071 if (i->multi.imr_multiaddr.s_addr == addr &&
2072 i->multi.imr_ifindex == ifindex)
2073 goto done;
2074 count++;
2075 }
2076 err = -ENOBUFS;
2077 if (count >= sysctl_igmp_max_memberships)
2078 goto done;
2079 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2080 if (!iml)
2081 goto done;
2082
2083 memcpy(&iml->multi, imr, sizeof(*imr));
2084 iml->next_rcu = inet->mc_list;
2085 iml->sflist = NULL;
2086 iml->sfmode = MCAST_EXCLUDE;
2087 rcu_assign_pointer(inet->mc_list, iml);
2088 ip_mc_inc_group(in_dev, addr);
2089 err = 0;
2090 done:
2091 return err;
2092 }
2093 EXPORT_SYMBOL(ip_mc_join_group);
2094
2095 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2096 struct in_device *in_dev)
2097 {
2098 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2099 int err;
2100
2101 if (!psf) {
2102 /* any-source empty exclude case */
2103 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2104 iml->sfmode, 0, NULL, 0);
2105 }
2106 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2107 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2108 RCU_INIT_POINTER(iml->sflist, NULL);
2109 /* decrease mem now to avoid the memleak warning */
2110 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2111 kfree_rcu(psf, rcu);
2112 return err;
2113 }
2114
2115 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2116 {
2117 struct inet_sock *inet = inet_sk(sk);
2118 struct ip_mc_socklist *iml;
2119 struct ip_mc_socklist __rcu **imlp;
2120 struct in_device *in_dev;
2121 struct net *net = sock_net(sk);
2122 __be32 group = imr->imr_multiaddr.s_addr;
2123 u32 ifindex;
2124 int ret = -EADDRNOTAVAIL;
2125
2126 ASSERT_RTNL();
2127
2128 in_dev = ip_mc_find_dev(net, imr);
2129 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2130 ret = -ENODEV;
2131 goto out;
2132 }
2133 ifindex = imr->imr_ifindex;
2134 for (imlp = &inet->mc_list;
2135 (iml = rtnl_dereference(*imlp)) != NULL;
2136 imlp = &iml->next_rcu) {
2137 if (iml->multi.imr_multiaddr.s_addr != group)
2138 continue;
2139 if (ifindex) {
2140 if (iml->multi.imr_ifindex != ifindex)
2141 continue;
2142 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2143 iml->multi.imr_address.s_addr)
2144 continue;
2145
2146 (void) ip_mc_leave_src(sk, iml, in_dev);
2147
2148 *imlp = iml->next_rcu;
2149
2150 if (in_dev)
2151 ip_mc_dec_group(in_dev, group);
2152
2153 /* decrease mem now to avoid the memleak warning */
2154 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2155 kfree_rcu(iml, rcu);
2156 return 0;
2157 }
2158 out:
2159 return ret;
2160 }
2161 EXPORT_SYMBOL(ip_mc_leave_group);
2162
2163 int ip_mc_source(int add, int omode, struct sock *sk, struct
2164 ip_mreq_source *mreqs, int ifindex)
2165 {
2166 int err;
2167 struct ip_mreqn imr;
2168 __be32 addr = mreqs->imr_multiaddr;
2169 struct ip_mc_socklist *pmc;
2170 struct in_device *in_dev = NULL;
2171 struct inet_sock *inet = inet_sk(sk);
2172 struct ip_sf_socklist *psl;
2173 struct net *net = sock_net(sk);
2174 int leavegroup = 0;
2175 int i, j, rv;
2176
2177 if (!ipv4_is_multicast(addr))
2178 return -EINVAL;
2179
2180 ASSERT_RTNL();
2181
2182 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2183 imr.imr_address.s_addr = mreqs->imr_interface;
2184 imr.imr_ifindex = ifindex;
2185 in_dev = ip_mc_find_dev(net, &imr);
2186
2187 if (!in_dev) {
2188 err = -ENODEV;
2189 goto done;
2190 }
2191 err = -EADDRNOTAVAIL;
2192
2193 for_each_pmc_rtnl(inet, pmc) {
2194 if ((pmc->multi.imr_multiaddr.s_addr ==
2195 imr.imr_multiaddr.s_addr) &&
2196 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2197 break;
2198 }
2199 if (!pmc) { /* must have a prior join */
2200 err = -EINVAL;
2201 goto done;
2202 }
2203 /* if a source filter was set, must be the same mode as before */
2204 if (pmc->sflist) {
2205 if (pmc->sfmode != omode) {
2206 err = -EINVAL;
2207 goto done;
2208 }
2209 } else if (pmc->sfmode != omode) {
2210 /* allow mode switches for empty-set filters */
2211 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2212 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2213 NULL, 0);
2214 pmc->sfmode = omode;
2215 }
2216
2217 psl = rtnl_dereference(pmc->sflist);
2218 if (!add) {
2219 if (!psl)
2220 goto done; /* err = -EADDRNOTAVAIL */
2221 rv = !0;
2222 for (i = 0; i < psl->sl_count; i++) {
2223 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2224 sizeof(__be32));
2225 if (rv == 0)
2226 break;
2227 }
2228 if (rv) /* source not found */
2229 goto done; /* err = -EADDRNOTAVAIL */
2230
2231 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2232 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2233 leavegroup = 1;
2234 goto done;
2235 }
2236
2237 /* update the interface filter */
2238 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2239 &mreqs->imr_sourceaddr, 1);
2240
2241 for (j = i+1; j < psl->sl_count; j++)
2242 psl->sl_addr[j-1] = psl->sl_addr[j];
2243 psl->sl_count--;
2244 err = 0;
2245 goto done;
2246 }
2247 /* else, add a new source to the filter */
2248
2249 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2250 err = -ENOBUFS;
2251 goto done;
2252 }
2253 if (!psl || psl->sl_count == psl->sl_max) {
2254 struct ip_sf_socklist *newpsl;
2255 int count = IP_SFBLOCK;
2256
2257 if (psl)
2258 count += psl->sl_max;
2259 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2260 if (!newpsl) {
2261 err = -ENOBUFS;
2262 goto done;
2263 }
2264 newpsl->sl_max = count;
2265 newpsl->sl_count = count - IP_SFBLOCK;
2266 if (psl) {
2267 for (i = 0; i < psl->sl_count; i++)
2268 newpsl->sl_addr[i] = psl->sl_addr[i];
2269 /* decrease mem now to avoid the memleak warning */
2270 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2271 kfree_rcu(psl, rcu);
2272 }
2273 rcu_assign_pointer(pmc->sflist, newpsl);
2274 psl = newpsl;
2275 }
2276 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2277 for (i = 0; i < psl->sl_count; i++) {
2278 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2279 sizeof(__be32));
2280 if (rv == 0)
2281 break;
2282 }
2283 if (rv == 0) /* address already there is an error */
2284 goto done;
2285 for (j = psl->sl_count-1; j >= i; j--)
2286 psl->sl_addr[j+1] = psl->sl_addr[j];
2287 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2288 psl->sl_count++;
2289 err = 0;
2290 /* update the interface list */
2291 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2292 &mreqs->imr_sourceaddr, 1);
2293 done:
2294 if (leavegroup)
2295 err = ip_mc_leave_group(sk, &imr);
2296 return err;
2297 }
2298
2299 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2300 {
2301 int err = 0;
2302 struct ip_mreqn imr;
2303 __be32 addr = msf->imsf_multiaddr;
2304 struct ip_mc_socklist *pmc;
2305 struct in_device *in_dev;
2306 struct inet_sock *inet = inet_sk(sk);
2307 struct ip_sf_socklist *newpsl, *psl;
2308 struct net *net = sock_net(sk);
2309 int leavegroup = 0;
2310
2311 if (!ipv4_is_multicast(addr))
2312 return -EINVAL;
2313 if (msf->imsf_fmode != MCAST_INCLUDE &&
2314 msf->imsf_fmode != MCAST_EXCLUDE)
2315 return -EINVAL;
2316
2317 ASSERT_RTNL();
2318
2319 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2320 imr.imr_address.s_addr = msf->imsf_interface;
2321 imr.imr_ifindex = ifindex;
2322 in_dev = ip_mc_find_dev(net, &imr);
2323
2324 if (!in_dev) {
2325 err = -ENODEV;
2326 goto done;
2327 }
2328
2329 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2330 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2331 leavegroup = 1;
2332 goto done;
2333 }
2334
2335 for_each_pmc_rtnl(inet, pmc) {
2336 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2337 pmc->multi.imr_ifindex == imr.imr_ifindex)
2338 break;
2339 }
2340 if (!pmc) { /* must have a prior join */
2341 err = -EINVAL;
2342 goto done;
2343 }
2344 if (msf->imsf_numsrc) {
2345 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2346 GFP_KERNEL);
2347 if (!newpsl) {
2348 err = -ENOBUFS;
2349 goto done;
2350 }
2351 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2352 memcpy(newpsl->sl_addr, msf->imsf_slist,
2353 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2354 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2355 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2356 if (err) {
2357 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2358 goto done;
2359 }
2360 } else {
2361 newpsl = NULL;
2362 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2363 msf->imsf_fmode, 0, NULL, 0);
2364 }
2365 psl = rtnl_dereference(pmc->sflist);
2366 if (psl) {
2367 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2368 psl->sl_count, psl->sl_addr, 0);
2369 /* decrease mem now to avoid the memleak warning */
2370 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2371 kfree_rcu(psl, rcu);
2372 } else
2373 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2374 0, NULL, 0);
2375 rcu_assign_pointer(pmc->sflist, newpsl);
2376 pmc->sfmode = msf->imsf_fmode;
2377 err = 0;
2378 done:
2379 if (leavegroup)
2380 err = ip_mc_leave_group(sk, &imr);
2381 return err;
2382 }
2383
2384 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2385 struct ip_msfilter __user *optval, int __user *optlen)
2386 {
2387 int err, len, count, copycount;
2388 struct ip_mreqn imr;
2389 __be32 addr = msf->imsf_multiaddr;
2390 struct ip_mc_socklist *pmc;
2391 struct in_device *in_dev;
2392 struct inet_sock *inet = inet_sk(sk);
2393 struct ip_sf_socklist *psl;
2394 struct net *net = sock_net(sk);
2395
2396 ASSERT_RTNL();
2397
2398 if (!ipv4_is_multicast(addr))
2399 return -EINVAL;
2400
2401 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2402 imr.imr_address.s_addr = msf->imsf_interface;
2403 imr.imr_ifindex = 0;
2404 in_dev = ip_mc_find_dev(net, &imr);
2405
2406 if (!in_dev) {
2407 err = -ENODEV;
2408 goto done;
2409 }
2410 err = -EADDRNOTAVAIL;
2411
2412 for_each_pmc_rtnl(inet, pmc) {
2413 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2414 pmc->multi.imr_ifindex == imr.imr_ifindex)
2415 break;
2416 }
2417 if (!pmc) /* must have a prior join */
2418 goto done;
2419 msf->imsf_fmode = pmc->sfmode;
2420 psl = rtnl_dereference(pmc->sflist);
2421 if (!psl) {
2422 len = 0;
2423 count = 0;
2424 } else {
2425 count = psl->sl_count;
2426 }
2427 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2428 len = copycount * sizeof(psl->sl_addr[0]);
2429 msf->imsf_numsrc = count;
2430 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2431 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2432 return -EFAULT;
2433 }
2434 if (len &&
2435 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2436 return -EFAULT;
2437 return 0;
2438 done:
2439 return err;
2440 }
2441
2442 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2443 struct group_filter __user *optval, int __user *optlen)
2444 {
2445 int err, i, count, copycount;
2446 struct sockaddr_in *psin;
2447 __be32 addr;
2448 struct ip_mc_socklist *pmc;
2449 struct inet_sock *inet = inet_sk(sk);
2450 struct ip_sf_socklist *psl;
2451
2452 ASSERT_RTNL();
2453
2454 psin = (struct sockaddr_in *)&gsf->gf_group;
2455 if (psin->sin_family != AF_INET)
2456 return -EINVAL;
2457 addr = psin->sin_addr.s_addr;
2458 if (!ipv4_is_multicast(addr))
2459 return -EINVAL;
2460
2461 err = -EADDRNOTAVAIL;
2462
2463 for_each_pmc_rtnl(inet, pmc) {
2464 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2465 pmc->multi.imr_ifindex == gsf->gf_interface)
2466 break;
2467 }
2468 if (!pmc) /* must have a prior join */
2469 goto done;
2470 gsf->gf_fmode = pmc->sfmode;
2471 psl = rtnl_dereference(pmc->sflist);
2472 count = psl ? psl->sl_count : 0;
2473 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2474 gsf->gf_numsrc = count;
2475 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2476 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2477 return -EFAULT;
2478 }
2479 for (i = 0; i < copycount; i++) {
2480 struct sockaddr_storage ss;
2481
2482 psin = (struct sockaddr_in *)&ss;
2483 memset(&ss, 0, sizeof(ss));
2484 psin->sin_family = AF_INET;
2485 psin->sin_addr.s_addr = psl->sl_addr[i];
2486 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2487 return -EFAULT;
2488 }
2489 return 0;
2490 done:
2491 return err;
2492 }
2493
2494 /*
2495 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2496 */
2497 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2498 {
2499 struct inet_sock *inet = inet_sk(sk);
2500 struct ip_mc_socklist *pmc;
2501 struct ip_sf_socklist *psl;
2502 int i;
2503 int ret;
2504
2505 ret = 1;
2506 if (!ipv4_is_multicast(loc_addr))
2507 goto out;
2508
2509 rcu_read_lock();
2510 for_each_pmc_rcu(inet, pmc) {
2511 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2512 pmc->multi.imr_ifindex == dif)
2513 break;
2514 }
2515 ret = inet->mc_all;
2516 if (!pmc)
2517 goto unlock;
2518 psl = rcu_dereference(pmc->sflist);
2519 ret = (pmc->sfmode == MCAST_EXCLUDE);
2520 if (!psl)
2521 goto unlock;
2522
2523 for (i = 0; i < psl->sl_count; i++) {
2524 if (psl->sl_addr[i] == rmt_addr)
2525 break;
2526 }
2527 ret = 0;
2528 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2529 goto unlock;
2530 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2531 goto unlock;
2532 ret = 1;
2533 unlock:
2534 rcu_read_unlock();
2535 out:
2536 return ret;
2537 }
2538
2539 /*
2540 * A socket is closing.
2541 */
2542
2543 void ip_mc_drop_socket(struct sock *sk)
2544 {
2545 struct inet_sock *inet = inet_sk(sk);
2546 struct ip_mc_socklist *iml;
2547 struct net *net = sock_net(sk);
2548
2549 if (!inet->mc_list)
2550 return;
2551
2552 rtnl_lock();
2553 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2554 struct in_device *in_dev;
2555
2556 inet->mc_list = iml->next_rcu;
2557 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2558 (void) ip_mc_leave_src(sk, iml, in_dev);
2559 if (in_dev)
2560 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2561 /* decrease mem now to avoid the memleak warning */
2562 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2563 kfree_rcu(iml, rcu);
2564 }
2565 rtnl_unlock();
2566 }
2567
2568 /* called with rcu_read_lock() */
2569 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2570 {
2571 struct ip_mc_list *im;
2572 struct ip_mc_list __rcu **mc_hash;
2573 struct ip_sf_list *psf;
2574 int rv = 0;
2575
2576 mc_hash = rcu_dereference(in_dev->mc_hash);
2577 if (mc_hash) {
2578 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2579
2580 for (im = rcu_dereference(mc_hash[hash]);
2581 im != NULL;
2582 im = rcu_dereference(im->next_hash)) {
2583 if (im->multiaddr == mc_addr)
2584 break;
2585 }
2586 } else {
2587 for_each_pmc_rcu(in_dev, im) {
2588 if (im->multiaddr == mc_addr)
2589 break;
2590 }
2591 }
2592 if (im && proto == IPPROTO_IGMP) {
2593 rv = 1;
2594 } else if (im) {
2595 if (src_addr) {
2596 for (psf = im->sources; psf; psf = psf->sf_next) {
2597 if (psf->sf_inaddr == src_addr)
2598 break;
2599 }
2600 if (psf)
2601 rv = psf->sf_count[MCAST_INCLUDE] ||
2602 psf->sf_count[MCAST_EXCLUDE] !=
2603 im->sfcount[MCAST_EXCLUDE];
2604 else
2605 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2606 } else
2607 rv = 1; /* unspecified source; tentatively allow */
2608 }
2609 return rv;
2610 }
2611
2612 #if defined(CONFIG_PROC_FS)
2613 struct igmp_mc_iter_state {
2614 struct seq_net_private p;
2615 struct net_device *dev;
2616 struct in_device *in_dev;
2617 };
2618
2619 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2620
2621 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2622 {
2623 struct net *net = seq_file_net(seq);
2624 struct ip_mc_list *im = NULL;
2625 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2626
2627 state->in_dev = NULL;
2628 for_each_netdev_rcu(net, state->dev) {
2629 struct in_device *in_dev;
2630
2631 in_dev = __in_dev_get_rcu(state->dev);
2632 if (!in_dev)
2633 continue;
2634 im = rcu_dereference(in_dev->mc_list);
2635 if (im) {
2636 state->in_dev = in_dev;
2637 break;
2638 }
2639 }
2640 return im;
2641 }
2642
2643 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2644 {
2645 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2646
2647 im = rcu_dereference(im->next_rcu);
2648 while (!im) {
2649 state->dev = next_net_device_rcu(state->dev);
2650 if (!state->dev) {
2651 state->in_dev = NULL;
2652 break;
2653 }
2654 state->in_dev = __in_dev_get_rcu(state->dev);
2655 if (!state->in_dev)
2656 continue;
2657 im = rcu_dereference(state->in_dev->mc_list);
2658 }
2659 return im;
2660 }
2661
2662 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2663 {
2664 struct ip_mc_list *im = igmp_mc_get_first(seq);
2665 if (im)
2666 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2667 --pos;
2668 return pos ? NULL : im;
2669 }
2670
2671 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2672 __acquires(rcu)
2673 {
2674 rcu_read_lock();
2675 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2676 }
2677
2678 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2679 {
2680 struct ip_mc_list *im;
2681 if (v == SEQ_START_TOKEN)
2682 im = igmp_mc_get_first(seq);
2683 else
2684 im = igmp_mc_get_next(seq, v);
2685 ++*pos;
2686 return im;
2687 }
2688
2689 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2690 __releases(rcu)
2691 {
2692 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2693
2694 state->in_dev = NULL;
2695 state->dev = NULL;
2696 rcu_read_unlock();
2697 }
2698
2699 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2700 {
2701 if (v == SEQ_START_TOKEN)
2702 seq_puts(seq,
2703 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2704 else {
2705 struct ip_mc_list *im = (struct ip_mc_list *)v;
2706 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2707 char *querier;
2708 long delta;
2709
2710 #ifdef CONFIG_IP_MULTICAST
2711 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2712 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2713 "V3";
2714 #else
2715 querier = "NONE";
2716 #endif
2717
2718 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2719 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2720 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2721 }
2722
2723 delta = im->timer.expires - jiffies;
2724 seq_printf(seq,
2725 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2726 im->multiaddr, im->users,
2727 im->tm_running,
2728 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2729 im->reporter);
2730 }
2731 return 0;
2732 }
2733
2734 static const struct seq_operations igmp_mc_seq_ops = {
2735 .start = igmp_mc_seq_start,
2736 .next = igmp_mc_seq_next,
2737 .stop = igmp_mc_seq_stop,
2738 .show = igmp_mc_seq_show,
2739 };
2740
2741 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2742 {
2743 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2744 sizeof(struct igmp_mc_iter_state));
2745 }
2746
2747 static const struct file_operations igmp_mc_seq_fops = {
2748 .owner = THIS_MODULE,
2749 .open = igmp_mc_seq_open,
2750 .read = seq_read,
2751 .llseek = seq_lseek,
2752 .release = seq_release_net,
2753 };
2754
2755 struct igmp_mcf_iter_state {
2756 struct seq_net_private p;
2757 struct net_device *dev;
2758 struct in_device *idev;
2759 struct ip_mc_list *im;
2760 };
2761
2762 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2763
2764 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2765 {
2766 struct net *net = seq_file_net(seq);
2767 struct ip_sf_list *psf = NULL;
2768 struct ip_mc_list *im = NULL;
2769 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2770
2771 state->idev = NULL;
2772 state->im = NULL;
2773 for_each_netdev_rcu(net, state->dev) {
2774 struct in_device *idev;
2775 idev = __in_dev_get_rcu(state->dev);
2776 if (unlikely(!idev))
2777 continue;
2778 im = rcu_dereference(idev->mc_list);
2779 if (likely(im)) {
2780 spin_lock_bh(&im->lock);
2781 psf = im->sources;
2782 if (likely(psf)) {
2783 state->im = im;
2784 state->idev = idev;
2785 break;
2786 }
2787 spin_unlock_bh(&im->lock);
2788 }
2789 }
2790 return psf;
2791 }
2792
2793 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2794 {
2795 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2796
2797 psf = psf->sf_next;
2798 while (!psf) {
2799 spin_unlock_bh(&state->im->lock);
2800 state->im = state->im->next;
2801 while (!state->im) {
2802 state->dev = next_net_device_rcu(state->dev);
2803 if (!state->dev) {
2804 state->idev = NULL;
2805 goto out;
2806 }
2807 state->idev = __in_dev_get_rcu(state->dev);
2808 if (!state->idev)
2809 continue;
2810 state->im = rcu_dereference(state->idev->mc_list);
2811 }
2812 if (!state->im)
2813 break;
2814 spin_lock_bh(&state->im->lock);
2815 psf = state->im->sources;
2816 }
2817 out:
2818 return psf;
2819 }
2820
2821 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2822 {
2823 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2824 if (psf)
2825 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2826 --pos;
2827 return pos ? NULL : psf;
2828 }
2829
2830 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2831 __acquires(rcu)
2832 {
2833 rcu_read_lock();
2834 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2835 }
2836
2837 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2838 {
2839 struct ip_sf_list *psf;
2840 if (v == SEQ_START_TOKEN)
2841 psf = igmp_mcf_get_first(seq);
2842 else
2843 psf = igmp_mcf_get_next(seq, v);
2844 ++*pos;
2845 return psf;
2846 }
2847
2848 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2849 __releases(rcu)
2850 {
2851 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2852 if (likely(state->im)) {
2853 spin_unlock_bh(&state->im->lock);
2854 state->im = NULL;
2855 }
2856 state->idev = NULL;
2857 state->dev = NULL;
2858 rcu_read_unlock();
2859 }
2860
2861 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2862 {
2863 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2864 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2865
2866 if (v == SEQ_START_TOKEN) {
2867 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2868 } else {
2869 seq_printf(seq,
2870 "%3d %6.6s 0x%08x "
2871 "0x%08x %6lu %6lu\n",
2872 state->dev->ifindex, state->dev->name,
2873 ntohl(state->im->multiaddr),
2874 ntohl(psf->sf_inaddr),
2875 psf->sf_count[MCAST_INCLUDE],
2876 psf->sf_count[MCAST_EXCLUDE]);
2877 }
2878 return 0;
2879 }
2880
2881 static const struct seq_operations igmp_mcf_seq_ops = {
2882 .start = igmp_mcf_seq_start,
2883 .next = igmp_mcf_seq_next,
2884 .stop = igmp_mcf_seq_stop,
2885 .show = igmp_mcf_seq_show,
2886 };
2887
2888 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2889 {
2890 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2891 sizeof(struct igmp_mcf_iter_state));
2892 }
2893
2894 static const struct file_operations igmp_mcf_seq_fops = {
2895 .owner = THIS_MODULE,
2896 .open = igmp_mcf_seq_open,
2897 .read = seq_read,
2898 .llseek = seq_lseek,
2899 .release = seq_release_net,
2900 };
2901
2902 static int __net_init igmp_net_init(struct net *net)
2903 {
2904 struct proc_dir_entry *pde;
2905 int err;
2906
2907 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2908 if (!pde)
2909 goto out_igmp;
2910 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2911 &igmp_mcf_seq_fops);
2912 if (!pde)
2913 goto out_mcfilter;
2914 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2915 SOCK_DGRAM, 0, net);
2916 if (err < 0) {
2917 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2918 err);
2919 goto out_sock;
2920 }
2921
2922 return 0;
2923
2924 out_sock:
2925 remove_proc_entry("mcfilter", net->proc_net);
2926 out_mcfilter:
2927 remove_proc_entry("igmp", net->proc_net);
2928 out_igmp:
2929 return -ENOMEM;
2930 }
2931
2932 static void __net_exit igmp_net_exit(struct net *net)
2933 {
2934 remove_proc_entry("mcfilter", net->proc_net);
2935 remove_proc_entry("igmp", net->proc_net);
2936 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2937 }
2938
2939 static struct pernet_operations igmp_net_ops = {
2940 .init = igmp_net_init,
2941 .exit = igmp_net_exit,
2942 };
2943 #endif
2944
2945 static int igmp_netdev_event(struct notifier_block *this,
2946 unsigned long event, void *ptr)
2947 {
2948 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2949 struct in_device *in_dev;
2950
2951 switch (event) {
2952 case NETDEV_RESEND_IGMP:
2953 in_dev = __in_dev_get_rtnl(dev);
2954 if (in_dev)
2955 ip_mc_rejoin_groups(in_dev);
2956 break;
2957 default:
2958 break;
2959 }
2960 return NOTIFY_DONE;
2961 }
2962
2963 static struct notifier_block igmp_notifier = {
2964 .notifier_call = igmp_netdev_event,
2965 };
2966
2967 int __init igmp_mc_init(void)
2968 {
2969 #if defined(CONFIG_PROC_FS)
2970 int err;
2971
2972 err = register_pernet_subsys(&igmp_net_ops);
2973 if (err)
2974 return err;
2975 err = register_netdevice_notifier(&igmp_notifier);
2976 if (err)
2977 goto reg_notif_fail;
2978 return 0;
2979
2980 reg_notif_fail:
2981 unregister_pernet_subsys(&igmp_net_ops);
2982 return err;
2983 #else
2984 return register_netdevice_notifier(&igmp_notifier);
2985 #endif
2986 }
Michael's Linux tree.