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[mirror_ubuntu-zesty-kernel.git] / net / ipv4 / igmp.c
1 /*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
11 * Authors:
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 * Fixes:
20 *
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
23 * functions.
24 * Alan Cox : Dumped the header building experiment.
25 * Alan Cox : Minor tweaks ready for multicast routing
26 * and extended IGMP protocol.
27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
28 * writes utterly bogus code otherwise (sigh)
29 * fixed IGMP loopback to behave in the manner
30 * desired by mrouted, fixed the fact it has been
31 * broken since 1.3.6 and cleaned up a few minor
32 * points.
33 *
34 * Chih-Jen Chang : Tried to revise IGMP to Version 2
35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
36 * The enhancements are mainly based on Steve Deering's
37 * ipmulti-3.5 source code.
38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
40 * the mrouted version on that device.
41 * Chih-Jen Chang : Added the max_resp_time parameter to
42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
43 * to identify the multicast router version
44 * and do what the IGMP version 2 specified.
45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
46 * Tsu-Sheng Tsao if the specified time expired.
47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
48 * Alan Cox : Use GFP_ATOMIC in the right places.
49 * Christian Daudt : igmp timer wasn't set for local group
50 * memberships but was being deleted,
51 * which caused a "del_timer() called
52 * from %p with timer not initialized\n"
53 * message (960131).
54 * Christian Daudt : removed del_timer from
55 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
58 * true (960216).
59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
60 * igmp_heard_query never trigger. Expiry
61 * miscalculation fixed in igmp_heard_query
62 * and random() made to return unsigned to
63 * prevent negative expiry times.
64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
65 * fix from pending 2.1.x patches.
66 * Alan Cox: Forget to enable FDDI support earlier.
67 * Alexey Kuznetsov: Fixed leaving groups on device down.
68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
69 * David L Stevens: IGMPv3 support, with help from
70 * Vinay Kulkarni
71 */
72
73 #include <linux/module.h>
74 #include <linux/slab.h>
75 #include <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 unsigned long exp = jiffies + tv + 2;
229
230 if (in_dev->mr_gq_running &&
231 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
232 return;
233
234 in_dev->mr_gq_running = 1;
235 if (!mod_timer(&in_dev->mr_gq_timer, exp))
236 in_dev_hold(in_dev);
237 }
238
239 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
240 {
241 int tv = prandom_u32() % delay;
242
243 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
244 in_dev_hold(in_dev);
245 }
246
247 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
248 {
249 spin_lock_bh(&im->lock);
250 im->unsolicit_count = 0;
251 if (del_timer(&im->timer)) {
252 if ((long)(im->timer.expires-jiffies) < max_delay) {
253 add_timer(&im->timer);
254 im->tm_running = 1;
255 spin_unlock_bh(&im->lock);
256 return;
257 }
258 atomic_dec(&im->refcnt);
259 }
260 igmp_start_timer(im, max_delay);
261 spin_unlock_bh(&im->lock);
262 }
263
264
265 /*
266 * Send an IGMP report.
267 */
268
269 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
270
271
272 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
273 int gdeleted, int sdeleted)
274 {
275 switch (type) {
276 case IGMPV3_MODE_IS_INCLUDE:
277 case IGMPV3_MODE_IS_EXCLUDE:
278 if (gdeleted || sdeleted)
279 return 0;
280 if (!(pmc->gsquery && !psf->sf_gsresp)) {
281 if (pmc->sfmode == MCAST_INCLUDE)
282 return 1;
283 /* don't include if this source is excluded
284 * in all filters
285 */
286 if (psf->sf_count[MCAST_INCLUDE])
287 return type == IGMPV3_MODE_IS_INCLUDE;
288 return pmc->sfcount[MCAST_EXCLUDE] ==
289 psf->sf_count[MCAST_EXCLUDE];
290 }
291 return 0;
292 case IGMPV3_CHANGE_TO_INCLUDE:
293 if (gdeleted || sdeleted)
294 return 0;
295 return psf->sf_count[MCAST_INCLUDE] != 0;
296 case IGMPV3_CHANGE_TO_EXCLUDE:
297 if (gdeleted || sdeleted)
298 return 0;
299 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
300 psf->sf_count[MCAST_INCLUDE])
301 return 0;
302 return pmc->sfcount[MCAST_EXCLUDE] ==
303 psf->sf_count[MCAST_EXCLUDE];
304 case IGMPV3_ALLOW_NEW_SOURCES:
305 if (gdeleted || !psf->sf_crcount)
306 return 0;
307 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
308 case IGMPV3_BLOCK_OLD_SOURCES:
309 if (pmc->sfmode == MCAST_INCLUDE)
310 return gdeleted || (psf->sf_crcount && sdeleted);
311 return psf->sf_crcount && !gdeleted && !sdeleted;
312 }
313 return 0;
314 }
315
316 static int
317 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
318 {
319 struct ip_sf_list *psf;
320 int scount = 0;
321
322 for (psf = pmc->sources; psf; psf = psf->sf_next) {
323 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
324 continue;
325 scount++;
326 }
327 return scount;
328 }
329
330 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
331 {
332 struct sk_buff *skb;
333 struct rtable *rt;
334 struct iphdr *pip;
335 struct igmpv3_report *pig;
336 struct net *net = dev_net(dev);
337 struct flowi4 fl4;
338 int hlen = LL_RESERVED_SPACE(dev);
339 int tlen = dev->needed_tailroom;
340 unsigned int size = mtu;
341
342 while (1) {
343 skb = alloc_skb(size + hlen + tlen,
344 GFP_ATOMIC | __GFP_NOWARN);
345 if (skb)
346 break;
347 size >>= 1;
348 if (size < 256)
349 return NULL;
350 }
351 skb->priority = TC_PRIO_CONTROL;
352
353 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
354 0, 0,
355 IPPROTO_IGMP, 0, dev->ifindex);
356 if (IS_ERR(rt)) {
357 kfree_skb(skb);
358 return NULL;
359 }
360
361 skb_dst_set(skb, &rt->dst);
362 skb->dev = dev;
363
364 skb_reserve(skb, hlen);
365 skb_tailroom_reserve(skb, mtu, tlen);
366
367 skb_reset_network_header(skb);
368 pip = ip_hdr(skb);
369 skb_put(skb, sizeof(struct iphdr) + 4);
370
371 pip->version = 4;
372 pip->ihl = (sizeof(struct iphdr)+4)>>2;
373 pip->tos = 0xc0;
374 pip->frag_off = htons(IP_DF);
375 pip->ttl = 1;
376 pip->daddr = fl4.daddr;
377 pip->saddr = fl4.saddr;
378 pip->protocol = IPPROTO_IGMP;
379 pip->tot_len = 0; /* filled in later */
380 ip_select_ident(net, skb, NULL);
381 ((u8 *)&pip[1])[0] = IPOPT_RA;
382 ((u8 *)&pip[1])[1] = 4;
383 ((u8 *)&pip[1])[2] = 0;
384 ((u8 *)&pip[1])[3] = 0;
385
386 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
387 skb_put(skb, sizeof(*pig));
388 pig = igmpv3_report_hdr(skb);
389 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
390 pig->resv1 = 0;
391 pig->csum = 0;
392 pig->resv2 = 0;
393 pig->ngrec = 0;
394 return skb;
395 }
396
397 static int igmpv3_sendpack(struct sk_buff *skb)
398 {
399 struct igmphdr *pig = igmp_hdr(skb);
400 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
401
402 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
403
404 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
405 }
406
407 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
408 {
409 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
410 }
411
412 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
413 int type, struct igmpv3_grec **ppgr)
414 {
415 struct net_device *dev = pmc->interface->dev;
416 struct igmpv3_report *pih;
417 struct igmpv3_grec *pgr;
418
419 if (!skb)
420 skb = igmpv3_newpack(dev, dev->mtu);
421 if (!skb)
422 return NULL;
423 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
424 pgr->grec_type = type;
425 pgr->grec_auxwords = 0;
426 pgr->grec_nsrcs = 0;
427 pgr->grec_mca = pmc->multiaddr;
428 pih = igmpv3_report_hdr(skb);
429 pih->ngrec = htons(ntohs(pih->ngrec)+1);
430 *ppgr = pgr;
431 return skb;
432 }
433
434 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
435
436 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
437 int type, int gdeleted, int sdeleted)
438 {
439 struct net_device *dev = pmc->interface->dev;
440 struct igmpv3_report *pih;
441 struct igmpv3_grec *pgr = NULL;
442 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
443 int scount, stotal, first, isquery, truncate;
444
445 if (pmc->multiaddr == IGMP_ALL_HOSTS)
446 return skb;
447 if (ipv4_is_local_multicast(pmc->multiaddr) && !sysctl_igmp_llm_reports)
448 return skb;
449
450 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
451 type == IGMPV3_MODE_IS_EXCLUDE;
452 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
453 type == IGMPV3_CHANGE_TO_EXCLUDE;
454
455 stotal = scount = 0;
456
457 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
458
459 if (!*psf_list)
460 goto empty_source;
461
462 pih = skb ? igmpv3_report_hdr(skb) : NULL;
463
464 /* EX and TO_EX get a fresh packet, if needed */
465 if (truncate) {
466 if (pih && pih->ngrec &&
467 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
468 if (skb)
469 igmpv3_sendpack(skb);
470 skb = igmpv3_newpack(dev, dev->mtu);
471 }
472 }
473 first = 1;
474 psf_prev = NULL;
475 for (psf = *psf_list; psf; psf = psf_next) {
476 __be32 *psrc;
477
478 psf_next = psf->sf_next;
479
480 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
481 psf_prev = psf;
482 continue;
483 }
484
485 /* clear marks on query responses */
486 if (isquery)
487 psf->sf_gsresp = 0;
488
489 if (AVAILABLE(skb) < sizeof(__be32) +
490 first*sizeof(struct igmpv3_grec)) {
491 if (truncate && !first)
492 break; /* truncate these */
493 if (pgr)
494 pgr->grec_nsrcs = htons(scount);
495 if (skb)
496 igmpv3_sendpack(skb);
497 skb = igmpv3_newpack(dev, dev->mtu);
498 first = 1;
499 scount = 0;
500 }
501 if (first) {
502 skb = add_grhead(skb, pmc, type, &pgr);
503 first = 0;
504 }
505 if (!skb)
506 return NULL;
507 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
508 *psrc = psf->sf_inaddr;
509 scount++; stotal++;
510 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
511 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
512 psf->sf_crcount--;
513 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
514 if (psf_prev)
515 psf_prev->sf_next = psf->sf_next;
516 else
517 *psf_list = psf->sf_next;
518 kfree(psf);
519 continue;
520 }
521 }
522 psf_prev = psf;
523 }
524
525 empty_source:
526 if (!stotal) {
527 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
528 type == IGMPV3_BLOCK_OLD_SOURCES)
529 return skb;
530 if (pmc->crcount || isquery) {
531 /* make sure we have room for group header */
532 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
533 igmpv3_sendpack(skb);
534 skb = NULL; /* add_grhead will get a new one */
535 }
536 skb = add_grhead(skb, pmc, type, &pgr);
537 }
538 }
539 if (pgr)
540 pgr->grec_nsrcs = htons(scount);
541
542 if (isquery)
543 pmc->gsquery = 0; /* clear query state on report */
544 return skb;
545 }
546
547 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
548 {
549 struct sk_buff *skb = NULL;
550 int type;
551
552 if (!pmc) {
553 rcu_read_lock();
554 for_each_pmc_rcu(in_dev, pmc) {
555 if (pmc->multiaddr == IGMP_ALL_HOSTS)
556 continue;
557 if (ipv4_is_local_multicast(pmc->multiaddr) &&
558 !sysctl_igmp_llm_reports)
559 continue;
560 spin_lock_bh(&pmc->lock);
561 if (pmc->sfcount[MCAST_EXCLUDE])
562 type = IGMPV3_MODE_IS_EXCLUDE;
563 else
564 type = IGMPV3_MODE_IS_INCLUDE;
565 skb = add_grec(skb, pmc, type, 0, 0);
566 spin_unlock_bh(&pmc->lock);
567 }
568 rcu_read_unlock();
569 } else {
570 spin_lock_bh(&pmc->lock);
571 if (pmc->sfcount[MCAST_EXCLUDE])
572 type = IGMPV3_MODE_IS_EXCLUDE;
573 else
574 type = IGMPV3_MODE_IS_INCLUDE;
575 skb = add_grec(skb, pmc, type, 0, 0);
576 spin_unlock_bh(&pmc->lock);
577 }
578 if (!skb)
579 return 0;
580 return igmpv3_sendpack(skb);
581 }
582
583 /*
584 * remove zero-count source records from a source filter list
585 */
586 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
587 {
588 struct ip_sf_list *psf_prev, *psf_next, *psf;
589
590 psf_prev = NULL;
591 for (psf = *ppsf; psf; psf = psf_next) {
592 psf_next = psf->sf_next;
593 if (psf->sf_crcount == 0) {
594 if (psf_prev)
595 psf_prev->sf_next = psf->sf_next;
596 else
597 *ppsf = psf->sf_next;
598 kfree(psf);
599 } else
600 psf_prev = psf;
601 }
602 }
603
604 static void igmpv3_send_cr(struct in_device *in_dev)
605 {
606 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
607 struct sk_buff *skb = NULL;
608 int type, dtype;
609
610 rcu_read_lock();
611 spin_lock_bh(&in_dev->mc_tomb_lock);
612
613 /* deleted MCA's */
614 pmc_prev = NULL;
615 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
616 pmc_next = pmc->next;
617 if (pmc->sfmode == MCAST_INCLUDE) {
618 type = IGMPV3_BLOCK_OLD_SOURCES;
619 dtype = IGMPV3_BLOCK_OLD_SOURCES;
620 skb = add_grec(skb, pmc, type, 1, 0);
621 skb = add_grec(skb, pmc, dtype, 1, 1);
622 }
623 if (pmc->crcount) {
624 if (pmc->sfmode == MCAST_EXCLUDE) {
625 type = IGMPV3_CHANGE_TO_INCLUDE;
626 skb = add_grec(skb, pmc, type, 1, 0);
627 }
628 pmc->crcount--;
629 if (pmc->crcount == 0) {
630 igmpv3_clear_zeros(&pmc->tomb);
631 igmpv3_clear_zeros(&pmc->sources);
632 }
633 }
634 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
635 if (pmc_prev)
636 pmc_prev->next = pmc_next;
637 else
638 in_dev->mc_tomb = pmc_next;
639 in_dev_put(pmc->interface);
640 kfree(pmc);
641 } else
642 pmc_prev = pmc;
643 }
644 spin_unlock_bh(&in_dev->mc_tomb_lock);
645
646 /* change recs */
647 for_each_pmc_rcu(in_dev, pmc) {
648 spin_lock_bh(&pmc->lock);
649 if (pmc->sfcount[MCAST_EXCLUDE]) {
650 type = IGMPV3_BLOCK_OLD_SOURCES;
651 dtype = IGMPV3_ALLOW_NEW_SOURCES;
652 } else {
653 type = IGMPV3_ALLOW_NEW_SOURCES;
654 dtype = IGMPV3_BLOCK_OLD_SOURCES;
655 }
656 skb = add_grec(skb, pmc, type, 0, 0);
657 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
658
659 /* filter mode changes */
660 if (pmc->crcount) {
661 if (pmc->sfmode == MCAST_EXCLUDE)
662 type = IGMPV3_CHANGE_TO_EXCLUDE;
663 else
664 type = IGMPV3_CHANGE_TO_INCLUDE;
665 skb = add_grec(skb, pmc, type, 0, 0);
666 pmc->crcount--;
667 }
668 spin_unlock_bh(&pmc->lock);
669 }
670 rcu_read_unlock();
671
672 if (!skb)
673 return;
674 (void) igmpv3_sendpack(skb);
675 }
676
677 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
678 int type)
679 {
680 struct sk_buff *skb;
681 struct iphdr *iph;
682 struct igmphdr *ih;
683 struct rtable *rt;
684 struct net_device *dev = in_dev->dev;
685 struct net *net = dev_net(dev);
686 __be32 group = pmc ? pmc->multiaddr : 0;
687 struct flowi4 fl4;
688 __be32 dst;
689 int hlen, tlen;
690
691 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
692 return igmpv3_send_report(in_dev, pmc);
693
694 if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
695 return 0;
696
697 if (type == IGMP_HOST_LEAVE_MESSAGE)
698 dst = IGMP_ALL_ROUTER;
699 else
700 dst = group;
701
702 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
703 0, 0,
704 IPPROTO_IGMP, 0, dev->ifindex);
705 if (IS_ERR(rt))
706 return -1;
707
708 hlen = LL_RESERVED_SPACE(dev);
709 tlen = dev->needed_tailroom;
710 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
711 if (!skb) {
712 ip_rt_put(rt);
713 return -1;
714 }
715 skb->priority = TC_PRIO_CONTROL;
716
717 skb_dst_set(skb, &rt->dst);
718
719 skb_reserve(skb, hlen);
720
721 skb_reset_network_header(skb);
722 iph = ip_hdr(skb);
723 skb_put(skb, sizeof(struct iphdr) + 4);
724
725 iph->version = 4;
726 iph->ihl = (sizeof(struct iphdr)+4)>>2;
727 iph->tos = 0xc0;
728 iph->frag_off = htons(IP_DF);
729 iph->ttl = 1;
730 iph->daddr = dst;
731 iph->saddr = fl4.saddr;
732 iph->protocol = IPPROTO_IGMP;
733 ip_select_ident(net, skb, NULL);
734 ((u8 *)&iph[1])[0] = IPOPT_RA;
735 ((u8 *)&iph[1])[1] = 4;
736 ((u8 *)&iph[1])[2] = 0;
737 ((u8 *)&iph[1])[3] = 0;
738
739 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
740 ih->type = type;
741 ih->code = 0;
742 ih->csum = 0;
743 ih->group = group;
744 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
745
746 return ip_local_out(net, skb->sk, skb);
747 }
748
749 static void igmp_gq_timer_expire(unsigned long data)
750 {
751 struct in_device *in_dev = (struct in_device *)data;
752
753 in_dev->mr_gq_running = 0;
754 igmpv3_send_report(in_dev, NULL);
755 in_dev_put(in_dev);
756 }
757
758 static void igmp_ifc_timer_expire(unsigned long data)
759 {
760 struct in_device *in_dev = (struct in_device *)data;
761
762 igmpv3_send_cr(in_dev);
763 if (in_dev->mr_ifc_count) {
764 in_dev->mr_ifc_count--;
765 igmp_ifc_start_timer(in_dev,
766 unsolicited_report_interval(in_dev));
767 }
768 in_dev_put(in_dev);
769 }
770
771 static void igmp_ifc_event(struct in_device *in_dev)
772 {
773 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
774 return;
775 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
776 igmp_ifc_start_timer(in_dev, 1);
777 }
778
779
780 static void igmp_timer_expire(unsigned long data)
781 {
782 struct ip_mc_list *im = (struct ip_mc_list *)data;
783 struct in_device *in_dev = im->interface;
784
785 spin_lock(&im->lock);
786 im->tm_running = 0;
787
788 if (im->unsolicit_count) {
789 im->unsolicit_count--;
790 igmp_start_timer(im, unsolicited_report_interval(in_dev));
791 }
792 im->reporter = 1;
793 spin_unlock(&im->lock);
794
795 if (IGMP_V1_SEEN(in_dev))
796 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
797 else if (IGMP_V2_SEEN(in_dev))
798 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
799 else
800 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
801
802 ip_ma_put(im);
803 }
804
805 /* mark EXCLUDE-mode sources */
806 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
807 {
808 struct ip_sf_list *psf;
809 int i, scount;
810
811 scount = 0;
812 for (psf = pmc->sources; psf; psf = psf->sf_next) {
813 if (scount == nsrcs)
814 break;
815 for (i = 0; i < nsrcs; i++) {
816 /* skip inactive filters */
817 if (psf->sf_count[MCAST_INCLUDE] ||
818 pmc->sfcount[MCAST_EXCLUDE] !=
819 psf->sf_count[MCAST_EXCLUDE])
820 break;
821 if (srcs[i] == psf->sf_inaddr) {
822 scount++;
823 break;
824 }
825 }
826 }
827 pmc->gsquery = 0;
828 if (scount == nsrcs) /* all sources excluded */
829 return 0;
830 return 1;
831 }
832
833 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
834 {
835 struct ip_sf_list *psf;
836 int i, scount;
837
838 if (pmc->sfmode == MCAST_EXCLUDE)
839 return igmp_xmarksources(pmc, nsrcs, srcs);
840
841 /* mark INCLUDE-mode sources */
842 scount = 0;
843 for (psf = pmc->sources; psf; psf = psf->sf_next) {
844 if (scount == nsrcs)
845 break;
846 for (i = 0; i < nsrcs; i++)
847 if (srcs[i] == psf->sf_inaddr) {
848 psf->sf_gsresp = 1;
849 scount++;
850 break;
851 }
852 }
853 if (!scount) {
854 pmc->gsquery = 0;
855 return 0;
856 }
857 pmc->gsquery = 1;
858 return 1;
859 }
860
861 /* return true if packet was dropped */
862 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
863 {
864 struct ip_mc_list *im;
865
866 /* Timers are only set for non-local groups */
867
868 if (group == IGMP_ALL_HOSTS)
869 return false;
870 if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
871 return false;
872
873 rcu_read_lock();
874 for_each_pmc_rcu(in_dev, im) {
875 if (im->multiaddr == group) {
876 igmp_stop_timer(im);
877 break;
878 }
879 }
880 rcu_read_unlock();
881 return false;
882 }
883
884 /* return true if packet was dropped */
885 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
886 int len)
887 {
888 struct igmphdr *ih = igmp_hdr(skb);
889 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
890 struct ip_mc_list *im;
891 __be32 group = ih->group;
892 int max_delay;
893 int mark = 0;
894
895
896 if (len == 8) {
897 if (ih->code == 0) {
898 /* Alas, old v1 router presents here. */
899
900 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
901 in_dev->mr_v1_seen = jiffies +
902 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
903 group = 0;
904 } else {
905 /* v2 router present */
906 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
907 in_dev->mr_v2_seen = jiffies +
908 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
909 }
910 /* cancel the interface change timer */
911 in_dev->mr_ifc_count = 0;
912 if (del_timer(&in_dev->mr_ifc_timer))
913 __in_dev_put(in_dev);
914 /* clear deleted report items */
915 igmpv3_clear_delrec(in_dev);
916 } else if (len < 12) {
917 return true; /* ignore bogus packet; freed by caller */
918 } else if (IGMP_V1_SEEN(in_dev)) {
919 /* This is a v3 query with v1 queriers present */
920 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
921 group = 0;
922 } else if (IGMP_V2_SEEN(in_dev)) {
923 /* this is a v3 query with v2 queriers present;
924 * Interpretation of the max_delay code is problematic here.
925 * A real v2 host would use ih_code directly, while v3 has a
926 * different encoding. We use the v3 encoding as more likely
927 * to be intended in a v3 query.
928 */
929 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
930 if (!max_delay)
931 max_delay = 1; /* can't mod w/ 0 */
932 } else { /* v3 */
933 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
934 return true;
935
936 ih3 = igmpv3_query_hdr(skb);
937 if (ih3->nsrcs) {
938 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
939 + ntohs(ih3->nsrcs)*sizeof(__be32)))
940 return true;
941 ih3 = igmpv3_query_hdr(skb);
942 }
943
944 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
945 if (!max_delay)
946 max_delay = 1; /* can't mod w/ 0 */
947 in_dev->mr_maxdelay = max_delay;
948 if (ih3->qrv)
949 in_dev->mr_qrv = ih3->qrv;
950 if (!group) { /* general query */
951 if (ih3->nsrcs)
952 return true; /* no sources allowed */
953 igmp_gq_start_timer(in_dev);
954 return false;
955 }
956 /* mark sources to include, if group & source-specific */
957 mark = ih3->nsrcs != 0;
958 }
959
960 /*
961 * - Start the timers in all of our membership records
962 * that the query applies to for the interface on
963 * which the query arrived excl. those that belong
964 * to a "local" group (224.0.0.X)
965 * - For timers already running check if they need to
966 * be reset.
967 * - Use the igmp->igmp_code field as the maximum
968 * delay possible
969 */
970 rcu_read_lock();
971 for_each_pmc_rcu(in_dev, im) {
972 int changed;
973
974 if (group && group != im->multiaddr)
975 continue;
976 if (im->multiaddr == IGMP_ALL_HOSTS)
977 continue;
978 if (ipv4_is_local_multicast(im->multiaddr) &&
979 !sysctl_igmp_llm_reports)
980 continue;
981 spin_lock_bh(&im->lock);
982 if (im->tm_running)
983 im->gsquery = im->gsquery && mark;
984 else
985 im->gsquery = mark;
986 changed = !im->gsquery ||
987 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
988 spin_unlock_bh(&im->lock);
989 if (changed)
990 igmp_mod_timer(im, max_delay);
991 }
992 rcu_read_unlock();
993 return false;
994 }
995
996 /* called in rcu_read_lock() section */
997 int igmp_rcv(struct sk_buff *skb)
998 {
999 /* This basically follows the spec line by line -- see RFC1112 */
1000 struct igmphdr *ih;
1001 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1002 int len = skb->len;
1003 bool dropped = true;
1004
1005 if (!in_dev)
1006 goto drop;
1007
1008 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1009 goto drop;
1010
1011 if (skb_checksum_simple_validate(skb))
1012 goto drop;
1013
1014 ih = igmp_hdr(skb);
1015 switch (ih->type) {
1016 case IGMP_HOST_MEMBERSHIP_QUERY:
1017 dropped = igmp_heard_query(in_dev, skb, len);
1018 break;
1019 case IGMP_HOST_MEMBERSHIP_REPORT:
1020 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1021 /* Is it our report looped back? */
1022 if (rt_is_output_route(skb_rtable(skb)))
1023 break;
1024 /* don't rely on MC router hearing unicast reports */
1025 if (skb->pkt_type == PACKET_MULTICAST ||
1026 skb->pkt_type == PACKET_BROADCAST)
1027 dropped = igmp_heard_report(in_dev, ih->group);
1028 break;
1029 case IGMP_PIM:
1030 #ifdef CONFIG_IP_PIMSM_V1
1031 return pim_rcv_v1(skb);
1032 #endif
1033 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1034 case IGMP_DVMRP:
1035 case IGMP_TRACE:
1036 case IGMP_HOST_LEAVE_MESSAGE:
1037 case IGMP_MTRACE:
1038 case IGMP_MTRACE_RESP:
1039 break;
1040 default:
1041 break;
1042 }
1043
1044 drop:
1045 if (dropped)
1046 kfree_skb(skb);
1047 else
1048 consume_skb(skb);
1049 return 0;
1050 }
1051
1052 #endif
1053
1054
1055 /*
1056 * Add a filter to a device
1057 */
1058
1059 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1060 {
1061 char buf[MAX_ADDR_LEN];
1062 struct net_device *dev = in_dev->dev;
1063
1064 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1065 We will get multicast token leakage, when IFF_MULTICAST
1066 is changed. This check should be done in ndo_set_rx_mode
1067 routine. Something sort of:
1068 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1069 --ANK
1070 */
1071 if (arp_mc_map(addr, buf, dev, 0) == 0)
1072 dev_mc_add(dev, buf);
1073 }
1074
1075 /*
1076 * Remove a filter from a device
1077 */
1078
1079 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1080 {
1081 char buf[MAX_ADDR_LEN];
1082 struct net_device *dev = in_dev->dev;
1083
1084 if (arp_mc_map(addr, buf, dev, 0) == 0)
1085 dev_mc_del(dev, buf);
1086 }
1087
1088 #ifdef CONFIG_IP_MULTICAST
1089 /*
1090 * deleted ip_mc_list manipulation
1091 */
1092 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1093 {
1094 struct ip_mc_list *pmc;
1095
1096 /* this is an "ip_mc_list" for convenience; only the fields below
1097 * are actually used. In particular, the refcnt and users are not
1098 * used for management of the delete list. Using the same structure
1099 * for deleted items allows change reports to use common code with
1100 * non-deleted or query-response MCA's.
1101 */
1102 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1103 if (!pmc)
1104 return;
1105 spin_lock_bh(&im->lock);
1106 pmc->interface = im->interface;
1107 in_dev_hold(in_dev);
1108 pmc->multiaddr = im->multiaddr;
1109 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1110 pmc->sfmode = im->sfmode;
1111 if (pmc->sfmode == MCAST_INCLUDE) {
1112 struct ip_sf_list *psf;
1113
1114 pmc->tomb = im->tomb;
1115 pmc->sources = im->sources;
1116 im->tomb = im->sources = NULL;
1117 for (psf = pmc->sources; psf; psf = psf->sf_next)
1118 psf->sf_crcount = pmc->crcount;
1119 }
1120 spin_unlock_bh(&im->lock);
1121
1122 spin_lock_bh(&in_dev->mc_tomb_lock);
1123 pmc->next = in_dev->mc_tomb;
1124 in_dev->mc_tomb = pmc;
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1126 }
1127
1128 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1129 {
1130 struct ip_mc_list *pmc, *pmc_prev;
1131 struct ip_sf_list *psf, *psf_next;
1132
1133 spin_lock_bh(&in_dev->mc_tomb_lock);
1134 pmc_prev = NULL;
1135 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1136 if (pmc->multiaddr == multiaddr)
1137 break;
1138 pmc_prev = pmc;
1139 }
1140 if (pmc) {
1141 if (pmc_prev)
1142 pmc_prev->next = pmc->next;
1143 else
1144 in_dev->mc_tomb = pmc->next;
1145 }
1146 spin_unlock_bh(&in_dev->mc_tomb_lock);
1147 if (pmc) {
1148 for (psf = pmc->tomb; psf; psf = psf_next) {
1149 psf_next = psf->sf_next;
1150 kfree(psf);
1151 }
1152 in_dev_put(pmc->interface);
1153 kfree(pmc);
1154 }
1155 }
1156
1157 static void igmpv3_clear_delrec(struct in_device *in_dev)
1158 {
1159 struct ip_mc_list *pmc, *nextpmc;
1160
1161 spin_lock_bh(&in_dev->mc_tomb_lock);
1162 pmc = in_dev->mc_tomb;
1163 in_dev->mc_tomb = NULL;
1164 spin_unlock_bh(&in_dev->mc_tomb_lock);
1165
1166 for (; pmc; pmc = nextpmc) {
1167 nextpmc = pmc->next;
1168 ip_mc_clear_src(pmc);
1169 in_dev_put(pmc->interface);
1170 kfree(pmc);
1171 }
1172 /* clear dead sources, too */
1173 rcu_read_lock();
1174 for_each_pmc_rcu(in_dev, pmc) {
1175 struct ip_sf_list *psf, *psf_next;
1176
1177 spin_lock_bh(&pmc->lock);
1178 psf = pmc->tomb;
1179 pmc->tomb = NULL;
1180 spin_unlock_bh(&pmc->lock);
1181 for (; psf; psf = psf_next) {
1182 psf_next = psf->sf_next;
1183 kfree(psf);
1184 }
1185 }
1186 rcu_read_unlock();
1187 }
1188 #endif
1189
1190 static void igmp_group_dropped(struct ip_mc_list *im)
1191 {
1192 struct in_device *in_dev = im->interface;
1193 #ifdef CONFIG_IP_MULTICAST
1194 int reporter;
1195 #endif
1196
1197 if (im->loaded) {
1198 im->loaded = 0;
1199 ip_mc_filter_del(in_dev, im->multiaddr);
1200 }
1201
1202 #ifdef CONFIG_IP_MULTICAST
1203 if (im->multiaddr == IGMP_ALL_HOSTS)
1204 return;
1205 if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports)
1206 return;
1207
1208 reporter = im->reporter;
1209 igmp_stop_timer(im);
1210
1211 if (!in_dev->dead) {
1212 if (IGMP_V1_SEEN(in_dev))
1213 return;
1214 if (IGMP_V2_SEEN(in_dev)) {
1215 if (reporter)
1216 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1217 return;
1218 }
1219 /* IGMPv3 */
1220 igmpv3_add_delrec(in_dev, im);
1221
1222 igmp_ifc_event(in_dev);
1223 }
1224 #endif
1225 }
1226
1227 static void igmp_group_added(struct ip_mc_list *im)
1228 {
1229 struct in_device *in_dev = im->interface;
1230
1231 if (im->loaded == 0) {
1232 im->loaded = 1;
1233 ip_mc_filter_add(in_dev, im->multiaddr);
1234 }
1235
1236 #ifdef CONFIG_IP_MULTICAST
1237 if (im->multiaddr == IGMP_ALL_HOSTS)
1238 return;
1239 if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports)
1240 return;
1241
1242 if (in_dev->dead)
1243 return;
1244 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1245 spin_lock_bh(&im->lock);
1246 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1247 spin_unlock_bh(&im->lock);
1248 return;
1249 }
1250 /* else, v3 */
1251
1252 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1253 igmp_ifc_event(in_dev);
1254 #endif
1255 }
1256
1257
1258 /*
1259 * Multicast list managers
1260 */
1261
1262 static u32 ip_mc_hash(const struct ip_mc_list *im)
1263 {
1264 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1265 }
1266
1267 static void ip_mc_hash_add(struct in_device *in_dev,
1268 struct ip_mc_list *im)
1269 {
1270 struct ip_mc_list __rcu **mc_hash;
1271 u32 hash;
1272
1273 mc_hash = rtnl_dereference(in_dev->mc_hash);
1274 if (mc_hash) {
1275 hash = ip_mc_hash(im);
1276 im->next_hash = mc_hash[hash];
1277 rcu_assign_pointer(mc_hash[hash], im);
1278 return;
1279 }
1280
1281 /* do not use a hash table for small number of items */
1282 if (in_dev->mc_count < 4)
1283 return;
1284
1285 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1286 GFP_KERNEL);
1287 if (!mc_hash)
1288 return;
1289
1290 for_each_pmc_rtnl(in_dev, im) {
1291 hash = ip_mc_hash(im);
1292 im->next_hash = mc_hash[hash];
1293 RCU_INIT_POINTER(mc_hash[hash], im);
1294 }
1295
1296 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1297 }
1298
1299 static void ip_mc_hash_remove(struct in_device *in_dev,
1300 struct ip_mc_list *im)
1301 {
1302 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1303 struct ip_mc_list *aux;
1304
1305 if (!mc_hash)
1306 return;
1307 mc_hash += ip_mc_hash(im);
1308 while ((aux = rtnl_dereference(*mc_hash)) != im)
1309 mc_hash = &aux->next_hash;
1310 *mc_hash = im->next_hash;
1311 }
1312
1313
1314 /*
1315 * A socket has joined a multicast group on device dev.
1316 */
1317
1318 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1319 {
1320 struct ip_mc_list *im;
1321
1322 ASSERT_RTNL();
1323
1324 for_each_pmc_rtnl(in_dev, im) {
1325 if (im->multiaddr == addr) {
1326 im->users++;
1327 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1328 goto out;
1329 }
1330 }
1331
1332 im = kzalloc(sizeof(*im), GFP_KERNEL);
1333 if (!im)
1334 goto out;
1335
1336 im->users = 1;
1337 im->interface = in_dev;
1338 in_dev_hold(in_dev);
1339 im->multiaddr = addr;
1340 /* initial mode is (EX, empty) */
1341 im->sfmode = MCAST_EXCLUDE;
1342 im->sfcount[MCAST_EXCLUDE] = 1;
1343 atomic_set(&im->refcnt, 1);
1344 spin_lock_init(&im->lock);
1345 #ifdef CONFIG_IP_MULTICAST
1346 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1347 im->unsolicit_count = sysctl_igmp_qrv;
1348 #endif
1349
1350 im->next_rcu = in_dev->mc_list;
1351 in_dev->mc_count++;
1352 rcu_assign_pointer(in_dev->mc_list, im);
1353
1354 ip_mc_hash_add(in_dev, im);
1355
1356 #ifdef CONFIG_IP_MULTICAST
1357 igmpv3_del_delrec(in_dev, im->multiaddr);
1358 #endif
1359 igmp_group_added(im);
1360 if (!in_dev->dead)
1361 ip_rt_multicast_event(in_dev);
1362 out:
1363 return;
1364 }
1365 EXPORT_SYMBOL(ip_mc_inc_group);
1366
1367 static int ip_mc_check_iphdr(struct sk_buff *skb)
1368 {
1369 const struct iphdr *iph;
1370 unsigned int len;
1371 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1372
1373 if (!pskb_may_pull(skb, offset))
1374 return -EINVAL;
1375
1376 iph = ip_hdr(skb);
1377
1378 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1379 return -EINVAL;
1380
1381 offset += ip_hdrlen(skb) - sizeof(*iph);
1382
1383 if (!pskb_may_pull(skb, offset))
1384 return -EINVAL;
1385
1386 iph = ip_hdr(skb);
1387
1388 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1389 return -EINVAL;
1390
1391 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1392 if (skb->len < len || len < offset)
1393 return -EINVAL;
1394
1395 skb_set_transport_header(skb, offset);
1396
1397 return 0;
1398 }
1399
1400 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1401 {
1402 unsigned int len = skb_transport_offset(skb);
1403
1404 len += sizeof(struct igmpv3_report);
1405
1406 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1407 }
1408
1409 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1410 {
1411 unsigned int len = skb_transport_offset(skb);
1412
1413 len += sizeof(struct igmphdr);
1414 if (skb->len < len)
1415 return -EINVAL;
1416
1417 /* IGMPv{1,2}? */
1418 if (skb->len != len) {
1419 /* or IGMPv3? */
1420 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1421 if (skb->len < len || !pskb_may_pull(skb, len))
1422 return -EINVAL;
1423 }
1424
1425 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1426 * all-systems destination addresses (224.0.0.1) for general queries
1427 */
1428 if (!igmp_hdr(skb)->group &&
1429 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1430 return -EINVAL;
1431
1432 return 0;
1433 }
1434
1435 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1436 {
1437 switch (igmp_hdr(skb)->type) {
1438 case IGMP_HOST_LEAVE_MESSAGE:
1439 case IGMP_HOST_MEMBERSHIP_REPORT:
1440 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1441 /* fall through */
1442 return 0;
1443 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1444 return ip_mc_check_igmp_reportv3(skb);
1445 case IGMP_HOST_MEMBERSHIP_QUERY:
1446 return ip_mc_check_igmp_query(skb);
1447 default:
1448 return -ENOMSG;
1449 }
1450 }
1451
1452 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1453 {
1454 return skb_checksum_simple_validate(skb);
1455 }
1456
1457 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1458
1459 {
1460 struct sk_buff *skb_chk;
1461 unsigned int transport_len;
1462 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1463 int ret = -EINVAL;
1464
1465 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1466
1467 skb_chk = skb_checksum_trimmed(skb, transport_len,
1468 ip_mc_validate_checksum);
1469 if (!skb_chk)
1470 goto err;
1471
1472 if (!pskb_may_pull(skb_chk, len))
1473 goto err;
1474
1475 ret = ip_mc_check_igmp_msg(skb_chk);
1476 if (ret)
1477 goto err;
1478
1479 if (skb_trimmed)
1480 *skb_trimmed = skb_chk;
1481 /* free now unneeded clone */
1482 else if (skb_chk != skb)
1483 kfree_skb(skb_chk);
1484
1485 ret = 0;
1486
1487 err:
1488 if (ret && skb_chk && skb_chk != skb)
1489 kfree_skb(skb_chk);
1490
1491 return ret;
1492 }
1493
1494 /**
1495 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1496 * @skb: the skb to validate
1497 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1498 *
1499 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1500 * skb transport header accordingly and returns zero.
1501 *
1502 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1503 * standard
1504 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1505 * -ENOMEM: A memory allocation failure happened.
1506 *
1507 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1508 * to NULL): After parsing an IGMP packet successfully it will point to
1509 * an skb which has its tail aligned to the IP packet end. This might
1510 * either be the originally provided skb or a trimmed, cloned version if
1511 * the skb frame had data beyond the IP packet. A cloned skb allows us
1512 * to leave the original skb and its full frame unchanged (which might be
1513 * desirable for layer 2 frame jugglers).
1514 *
1515 * Caller needs to set the skb network header and free any returned skb if it
1516 * differs from the provided skb.
1517 */
1518 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1519 {
1520 int ret = ip_mc_check_iphdr(skb);
1521
1522 if (ret < 0)
1523 return ret;
1524
1525 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1526 return -ENOMSG;
1527
1528 return __ip_mc_check_igmp(skb, skb_trimmed);
1529 }
1530 EXPORT_SYMBOL(ip_mc_check_igmp);
1531
1532 /*
1533 * Resend IGMP JOIN report; used by netdev notifier.
1534 */
1535 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1536 {
1537 #ifdef CONFIG_IP_MULTICAST
1538 struct ip_mc_list *im;
1539 int type;
1540
1541 ASSERT_RTNL();
1542
1543 for_each_pmc_rtnl(in_dev, im) {
1544 if (im->multiaddr == IGMP_ALL_HOSTS)
1545 continue;
1546 if (ipv4_is_local_multicast(im->multiaddr) &&
1547 !sysctl_igmp_llm_reports)
1548 continue;
1549
1550 /* a failover is happening and switches
1551 * must be notified immediately
1552 */
1553 if (IGMP_V1_SEEN(in_dev))
1554 type = IGMP_HOST_MEMBERSHIP_REPORT;
1555 else if (IGMP_V2_SEEN(in_dev))
1556 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1557 else
1558 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1559 igmp_send_report(in_dev, im, type);
1560 }
1561 #endif
1562 }
1563
1564 /*
1565 * A socket has left a multicast group on device dev
1566 */
1567
1568 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1569 {
1570 struct ip_mc_list *i;
1571 struct ip_mc_list __rcu **ip;
1572
1573 ASSERT_RTNL();
1574
1575 for (ip = &in_dev->mc_list;
1576 (i = rtnl_dereference(*ip)) != NULL;
1577 ip = &i->next_rcu) {
1578 if (i->multiaddr == addr) {
1579 if (--i->users == 0) {
1580 ip_mc_hash_remove(in_dev, i);
1581 *ip = i->next_rcu;
1582 in_dev->mc_count--;
1583 igmp_group_dropped(i);
1584 ip_mc_clear_src(i);
1585
1586 if (!in_dev->dead)
1587 ip_rt_multicast_event(in_dev);
1588
1589 ip_ma_put(i);
1590 return;
1591 }
1592 break;
1593 }
1594 }
1595 }
1596 EXPORT_SYMBOL(ip_mc_dec_group);
1597
1598 /* Device changing type */
1599
1600 void ip_mc_unmap(struct in_device *in_dev)
1601 {
1602 struct ip_mc_list *pmc;
1603
1604 ASSERT_RTNL();
1605
1606 for_each_pmc_rtnl(in_dev, pmc)
1607 igmp_group_dropped(pmc);
1608 }
1609
1610 void ip_mc_remap(struct in_device *in_dev)
1611 {
1612 struct ip_mc_list *pmc;
1613
1614 ASSERT_RTNL();
1615
1616 for_each_pmc_rtnl(in_dev, pmc)
1617 igmp_group_added(pmc);
1618 }
1619
1620 /* Device going down */
1621
1622 void ip_mc_down(struct in_device *in_dev)
1623 {
1624 struct ip_mc_list *pmc;
1625
1626 ASSERT_RTNL();
1627
1628 for_each_pmc_rtnl(in_dev, pmc)
1629 igmp_group_dropped(pmc);
1630
1631 #ifdef CONFIG_IP_MULTICAST
1632 in_dev->mr_ifc_count = 0;
1633 if (del_timer(&in_dev->mr_ifc_timer))
1634 __in_dev_put(in_dev);
1635 in_dev->mr_gq_running = 0;
1636 if (del_timer(&in_dev->mr_gq_timer))
1637 __in_dev_put(in_dev);
1638 igmpv3_clear_delrec(in_dev);
1639 #endif
1640
1641 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1642 }
1643
1644 void ip_mc_init_dev(struct in_device *in_dev)
1645 {
1646 ASSERT_RTNL();
1647
1648 #ifdef CONFIG_IP_MULTICAST
1649 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1650 (unsigned long)in_dev);
1651 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1652 (unsigned long)in_dev);
1653 in_dev->mr_qrv = sysctl_igmp_qrv;
1654 #endif
1655
1656 spin_lock_init(&in_dev->mc_tomb_lock);
1657 }
1658
1659 /* Device going up */
1660
1661 void ip_mc_up(struct in_device *in_dev)
1662 {
1663 struct ip_mc_list *pmc;
1664
1665 ASSERT_RTNL();
1666
1667 #ifdef CONFIG_IP_MULTICAST
1668 in_dev->mr_qrv = sysctl_igmp_qrv;
1669 #endif
1670 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1671
1672 for_each_pmc_rtnl(in_dev, pmc)
1673 igmp_group_added(pmc);
1674 }
1675
1676 /*
1677 * Device is about to be destroyed: clean up.
1678 */
1679
1680 void ip_mc_destroy_dev(struct in_device *in_dev)
1681 {
1682 struct ip_mc_list *i;
1683
1684 ASSERT_RTNL();
1685
1686 /* Deactivate timers */
1687 ip_mc_down(in_dev);
1688
1689 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1690 in_dev->mc_list = i->next_rcu;
1691 in_dev->mc_count--;
1692
1693 /* We've dropped the groups in ip_mc_down already */
1694 ip_mc_clear_src(i);
1695 ip_ma_put(i);
1696 }
1697 }
1698
1699 /* RTNL is locked */
1700 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1701 {
1702 struct net_device *dev = NULL;
1703 struct in_device *idev = NULL;
1704
1705 if (imr->imr_ifindex) {
1706 idev = inetdev_by_index(net, imr->imr_ifindex);
1707 return idev;
1708 }
1709 if (imr->imr_address.s_addr) {
1710 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1711 if (!dev)
1712 return NULL;
1713 }
1714
1715 if (!dev) {
1716 struct rtable *rt = ip_route_output(net,
1717 imr->imr_multiaddr.s_addr,
1718 0, 0, 0);
1719 if (!IS_ERR(rt)) {
1720 dev = rt->dst.dev;
1721 ip_rt_put(rt);
1722 }
1723 }
1724 if (dev) {
1725 imr->imr_ifindex = dev->ifindex;
1726 idev = __in_dev_get_rtnl(dev);
1727 }
1728 return idev;
1729 }
1730
1731 /*
1732 * Join a socket to a group
1733 */
1734 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1735 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1736 #ifdef CONFIG_IP_MULTICAST
1737 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
1738 #endif
1739
1740 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1741 __be32 *psfsrc)
1742 {
1743 struct ip_sf_list *psf, *psf_prev;
1744 int rv = 0;
1745
1746 psf_prev = NULL;
1747 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1748 if (psf->sf_inaddr == *psfsrc)
1749 break;
1750 psf_prev = psf;
1751 }
1752 if (!psf || psf->sf_count[sfmode] == 0) {
1753 /* source filter not found, or count wrong => bug */
1754 return -ESRCH;
1755 }
1756 psf->sf_count[sfmode]--;
1757 if (psf->sf_count[sfmode] == 0) {
1758 ip_rt_multicast_event(pmc->interface);
1759 }
1760 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1761 #ifdef CONFIG_IP_MULTICAST
1762 struct in_device *in_dev = pmc->interface;
1763 #endif
1764
1765 /* no more filters for this source */
1766 if (psf_prev)
1767 psf_prev->sf_next = psf->sf_next;
1768 else
1769 pmc->sources = psf->sf_next;
1770 #ifdef CONFIG_IP_MULTICAST
1771 if (psf->sf_oldin &&
1772 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1773 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1774 psf->sf_next = pmc->tomb;
1775 pmc->tomb = psf;
1776 rv = 1;
1777 } else
1778 #endif
1779 kfree(psf);
1780 }
1781 return rv;
1782 }
1783
1784 #ifndef CONFIG_IP_MULTICAST
1785 #define igmp_ifc_event(x) do { } while (0)
1786 #endif
1787
1788 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1789 int sfcount, __be32 *psfsrc, int delta)
1790 {
1791 struct ip_mc_list *pmc;
1792 int changerec = 0;
1793 int i, err;
1794
1795 if (!in_dev)
1796 return -ENODEV;
1797 rcu_read_lock();
1798 for_each_pmc_rcu(in_dev, pmc) {
1799 if (*pmca == pmc->multiaddr)
1800 break;
1801 }
1802 if (!pmc) {
1803 /* MCA not found?? bug */
1804 rcu_read_unlock();
1805 return -ESRCH;
1806 }
1807 spin_lock_bh(&pmc->lock);
1808 rcu_read_unlock();
1809 #ifdef CONFIG_IP_MULTICAST
1810 sf_markstate(pmc);
1811 #endif
1812 if (!delta) {
1813 err = -EINVAL;
1814 if (!pmc->sfcount[sfmode])
1815 goto out_unlock;
1816 pmc->sfcount[sfmode]--;
1817 }
1818 err = 0;
1819 for (i = 0; i < sfcount; i++) {
1820 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1821
1822 changerec |= rv > 0;
1823 if (!err && rv < 0)
1824 err = rv;
1825 }
1826 if (pmc->sfmode == MCAST_EXCLUDE &&
1827 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1828 pmc->sfcount[MCAST_INCLUDE]) {
1829 #ifdef CONFIG_IP_MULTICAST
1830 struct ip_sf_list *psf;
1831 #endif
1832
1833 /* filter mode change */
1834 pmc->sfmode = MCAST_INCLUDE;
1835 #ifdef CONFIG_IP_MULTICAST
1836 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1837 in_dev->mr_ifc_count = pmc->crcount;
1838 for (psf = pmc->sources; psf; psf = psf->sf_next)
1839 psf->sf_crcount = 0;
1840 igmp_ifc_event(pmc->interface);
1841 } else if (sf_setstate(pmc) || changerec) {
1842 igmp_ifc_event(pmc->interface);
1843 #endif
1844 }
1845 out_unlock:
1846 spin_unlock_bh(&pmc->lock);
1847 return err;
1848 }
1849
1850 /*
1851 * Add multicast single-source filter to the interface list
1852 */
1853 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1854 __be32 *psfsrc)
1855 {
1856 struct ip_sf_list *psf, *psf_prev;
1857
1858 psf_prev = NULL;
1859 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1860 if (psf->sf_inaddr == *psfsrc)
1861 break;
1862 psf_prev = psf;
1863 }
1864 if (!psf) {
1865 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1866 if (!psf)
1867 return -ENOBUFS;
1868 psf->sf_inaddr = *psfsrc;
1869 if (psf_prev) {
1870 psf_prev->sf_next = psf;
1871 } else
1872 pmc->sources = psf;
1873 }
1874 psf->sf_count[sfmode]++;
1875 if (psf->sf_count[sfmode] == 1) {
1876 ip_rt_multicast_event(pmc->interface);
1877 }
1878 return 0;
1879 }
1880
1881 #ifdef CONFIG_IP_MULTICAST
1882 static void sf_markstate(struct ip_mc_list *pmc)
1883 {
1884 struct ip_sf_list *psf;
1885 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1886
1887 for (psf = pmc->sources; psf; psf = psf->sf_next)
1888 if (pmc->sfcount[MCAST_EXCLUDE]) {
1889 psf->sf_oldin = mca_xcount ==
1890 psf->sf_count[MCAST_EXCLUDE] &&
1891 !psf->sf_count[MCAST_INCLUDE];
1892 } else
1893 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1894 }
1895
1896 static int sf_setstate(struct ip_mc_list *pmc)
1897 {
1898 struct ip_sf_list *psf, *dpsf;
1899 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1900 int qrv = pmc->interface->mr_qrv;
1901 int new_in, rv;
1902
1903 rv = 0;
1904 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1905 if (pmc->sfcount[MCAST_EXCLUDE]) {
1906 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1907 !psf->sf_count[MCAST_INCLUDE];
1908 } else
1909 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1910 if (new_in) {
1911 if (!psf->sf_oldin) {
1912 struct ip_sf_list *prev = NULL;
1913
1914 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1915 if (dpsf->sf_inaddr == psf->sf_inaddr)
1916 break;
1917 prev = dpsf;
1918 }
1919 if (dpsf) {
1920 if (prev)
1921 prev->sf_next = dpsf->sf_next;
1922 else
1923 pmc->tomb = dpsf->sf_next;
1924 kfree(dpsf);
1925 }
1926 psf->sf_crcount = qrv;
1927 rv++;
1928 }
1929 } else if (psf->sf_oldin) {
1930
1931 psf->sf_crcount = 0;
1932 /*
1933 * add or update "delete" records if an active filter
1934 * is now inactive
1935 */
1936 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1937 if (dpsf->sf_inaddr == psf->sf_inaddr)
1938 break;
1939 if (!dpsf) {
1940 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1941 if (!dpsf)
1942 continue;
1943 *dpsf = *psf;
1944 /* pmc->lock held by callers */
1945 dpsf->sf_next = pmc->tomb;
1946 pmc->tomb = dpsf;
1947 }
1948 dpsf->sf_crcount = qrv;
1949 rv++;
1950 }
1951 }
1952 return rv;
1953 }
1954 #endif
1955
1956 /*
1957 * Add multicast source filter list to the interface list
1958 */
1959 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1960 int sfcount, __be32 *psfsrc, int delta)
1961 {
1962 struct ip_mc_list *pmc;
1963 int isexclude;
1964 int i, err;
1965
1966 if (!in_dev)
1967 return -ENODEV;
1968 rcu_read_lock();
1969 for_each_pmc_rcu(in_dev, pmc) {
1970 if (*pmca == pmc->multiaddr)
1971 break;
1972 }
1973 if (!pmc) {
1974 /* MCA not found?? bug */
1975 rcu_read_unlock();
1976 return -ESRCH;
1977 }
1978 spin_lock_bh(&pmc->lock);
1979 rcu_read_unlock();
1980
1981 #ifdef CONFIG_IP_MULTICAST
1982 sf_markstate(pmc);
1983 #endif
1984 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1985 if (!delta)
1986 pmc->sfcount[sfmode]++;
1987 err = 0;
1988 for (i = 0; i < sfcount; i++) {
1989 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1990 if (err)
1991 break;
1992 }
1993 if (err) {
1994 int j;
1995
1996 if (!delta)
1997 pmc->sfcount[sfmode]--;
1998 for (j = 0; j < i; j++)
1999 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2000 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2001 #ifdef CONFIG_IP_MULTICAST
2002 struct ip_sf_list *psf;
2003 in_dev = pmc->interface;
2004 #endif
2005
2006 /* filter mode change */
2007 if (pmc->sfcount[MCAST_EXCLUDE])
2008 pmc->sfmode = MCAST_EXCLUDE;
2009 else if (pmc->sfcount[MCAST_INCLUDE])
2010 pmc->sfmode = MCAST_INCLUDE;
2011 #ifdef CONFIG_IP_MULTICAST
2012 /* else no filters; keep old mode for reports */
2013
2014 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
2015 in_dev->mr_ifc_count = pmc->crcount;
2016 for (psf = pmc->sources; psf; psf = psf->sf_next)
2017 psf->sf_crcount = 0;
2018 igmp_ifc_event(in_dev);
2019 } else if (sf_setstate(pmc)) {
2020 igmp_ifc_event(in_dev);
2021 #endif
2022 }
2023 spin_unlock_bh(&pmc->lock);
2024 return err;
2025 }
2026
2027 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2028 {
2029 struct ip_sf_list *psf, *nextpsf;
2030
2031 for (psf = pmc->tomb; psf; psf = nextpsf) {
2032 nextpsf = psf->sf_next;
2033 kfree(psf);
2034 }
2035 pmc->tomb = NULL;
2036 for (psf = pmc->sources; psf; psf = nextpsf) {
2037 nextpsf = psf->sf_next;
2038 kfree(psf);
2039 }
2040 pmc->sources = NULL;
2041 pmc->sfmode = MCAST_EXCLUDE;
2042 pmc->sfcount[MCAST_INCLUDE] = 0;
2043 pmc->sfcount[MCAST_EXCLUDE] = 1;
2044 }
2045
2046 /* Join a multicast group
2047 */
2048
2049 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2050 {
2051 __be32 addr = imr->imr_multiaddr.s_addr;
2052 struct ip_mc_socklist *iml, *i;
2053 struct in_device *in_dev;
2054 struct inet_sock *inet = inet_sk(sk);
2055 struct net *net = sock_net(sk);
2056 int ifindex;
2057 int count = 0;
2058 int err;
2059
2060 ASSERT_RTNL();
2061
2062 if (!ipv4_is_multicast(addr))
2063 return -EINVAL;
2064
2065 in_dev = ip_mc_find_dev(net, imr);
2066
2067 if (!in_dev) {
2068 err = -ENODEV;
2069 goto done;
2070 }
2071
2072 err = -EADDRINUSE;
2073 ifindex = imr->imr_ifindex;
2074 for_each_pmc_rtnl(inet, i) {
2075 if (i->multi.imr_multiaddr.s_addr == addr &&
2076 i->multi.imr_ifindex == ifindex)
2077 goto done;
2078 count++;
2079 }
2080 err = -ENOBUFS;
2081 if (count >= sysctl_igmp_max_memberships)
2082 goto done;
2083 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2084 if (!iml)
2085 goto done;
2086
2087 memcpy(&iml->multi, imr, sizeof(*imr));
2088 iml->next_rcu = inet->mc_list;
2089 iml->sflist = NULL;
2090 iml->sfmode = MCAST_EXCLUDE;
2091 rcu_assign_pointer(inet->mc_list, iml);
2092 ip_mc_inc_group(in_dev, addr);
2093 err = 0;
2094 done:
2095 return err;
2096 }
2097 EXPORT_SYMBOL(ip_mc_join_group);
2098
2099 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2100 struct in_device *in_dev)
2101 {
2102 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2103 int err;
2104
2105 if (!psf) {
2106 /* any-source empty exclude case */
2107 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2108 iml->sfmode, 0, NULL, 0);
2109 }
2110 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2111 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2112 RCU_INIT_POINTER(iml->sflist, NULL);
2113 /* decrease mem now to avoid the memleak warning */
2114 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2115 kfree_rcu(psf, rcu);
2116 return err;
2117 }
2118
2119 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2120 {
2121 struct inet_sock *inet = inet_sk(sk);
2122 struct ip_mc_socklist *iml;
2123 struct ip_mc_socklist __rcu **imlp;
2124 struct in_device *in_dev;
2125 struct net *net = sock_net(sk);
2126 __be32 group = imr->imr_multiaddr.s_addr;
2127 u32 ifindex;
2128 int ret = -EADDRNOTAVAIL;
2129
2130 ASSERT_RTNL();
2131
2132 in_dev = ip_mc_find_dev(net, imr);
2133 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2134 ret = -ENODEV;
2135 goto out;
2136 }
2137 ifindex = imr->imr_ifindex;
2138 for (imlp = &inet->mc_list;
2139 (iml = rtnl_dereference(*imlp)) != NULL;
2140 imlp = &iml->next_rcu) {
2141 if (iml->multi.imr_multiaddr.s_addr != group)
2142 continue;
2143 if (ifindex) {
2144 if (iml->multi.imr_ifindex != ifindex)
2145 continue;
2146 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2147 iml->multi.imr_address.s_addr)
2148 continue;
2149
2150 (void) ip_mc_leave_src(sk, iml, in_dev);
2151
2152 *imlp = iml->next_rcu;
2153
2154 if (in_dev)
2155 ip_mc_dec_group(in_dev, group);
2156
2157 /* decrease mem now to avoid the memleak warning */
2158 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2159 kfree_rcu(iml, rcu);
2160 return 0;
2161 }
2162 out:
2163 return ret;
2164 }
2165 EXPORT_SYMBOL(ip_mc_leave_group);
2166
2167 int ip_mc_source(int add, int omode, struct sock *sk, struct
2168 ip_mreq_source *mreqs, int ifindex)
2169 {
2170 int err;
2171 struct ip_mreqn imr;
2172 __be32 addr = mreqs->imr_multiaddr;
2173 struct ip_mc_socklist *pmc;
2174 struct in_device *in_dev = NULL;
2175 struct inet_sock *inet = inet_sk(sk);
2176 struct ip_sf_socklist *psl;
2177 struct net *net = sock_net(sk);
2178 int leavegroup = 0;
2179 int i, j, rv;
2180
2181 if (!ipv4_is_multicast(addr))
2182 return -EINVAL;
2183
2184 ASSERT_RTNL();
2185
2186 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2187 imr.imr_address.s_addr = mreqs->imr_interface;
2188 imr.imr_ifindex = ifindex;
2189 in_dev = ip_mc_find_dev(net, &imr);
2190
2191 if (!in_dev) {
2192 err = -ENODEV;
2193 goto done;
2194 }
2195 err = -EADDRNOTAVAIL;
2196
2197 for_each_pmc_rtnl(inet, pmc) {
2198 if ((pmc->multi.imr_multiaddr.s_addr ==
2199 imr.imr_multiaddr.s_addr) &&
2200 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2201 break;
2202 }
2203 if (!pmc) { /* must have a prior join */
2204 err = -EINVAL;
2205 goto done;
2206 }
2207 /* if a source filter was set, must be the same mode as before */
2208 if (pmc->sflist) {
2209 if (pmc->sfmode != omode) {
2210 err = -EINVAL;
2211 goto done;
2212 }
2213 } else if (pmc->sfmode != omode) {
2214 /* allow mode switches for empty-set filters */
2215 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2216 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2217 NULL, 0);
2218 pmc->sfmode = omode;
2219 }
2220
2221 psl = rtnl_dereference(pmc->sflist);
2222 if (!add) {
2223 if (!psl)
2224 goto done; /* err = -EADDRNOTAVAIL */
2225 rv = !0;
2226 for (i = 0; i < psl->sl_count; i++) {
2227 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2228 sizeof(__be32));
2229 if (rv == 0)
2230 break;
2231 }
2232 if (rv) /* source not found */
2233 goto done; /* err = -EADDRNOTAVAIL */
2234
2235 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2236 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2237 leavegroup = 1;
2238 goto done;
2239 }
2240
2241 /* update the interface filter */
2242 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2243 &mreqs->imr_sourceaddr, 1);
2244
2245 for (j = i+1; j < psl->sl_count; j++)
2246 psl->sl_addr[j-1] = psl->sl_addr[j];
2247 psl->sl_count--;
2248 err = 0;
2249 goto done;
2250 }
2251 /* else, add a new source to the filter */
2252
2253 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2254 err = -ENOBUFS;
2255 goto done;
2256 }
2257 if (!psl || psl->sl_count == psl->sl_max) {
2258 struct ip_sf_socklist *newpsl;
2259 int count = IP_SFBLOCK;
2260
2261 if (psl)
2262 count += psl->sl_max;
2263 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2264 if (!newpsl) {
2265 err = -ENOBUFS;
2266 goto done;
2267 }
2268 newpsl->sl_max = count;
2269 newpsl->sl_count = count - IP_SFBLOCK;
2270 if (psl) {
2271 for (i = 0; i < psl->sl_count; i++)
2272 newpsl->sl_addr[i] = psl->sl_addr[i];
2273 /* decrease mem now to avoid the memleak warning */
2274 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2275 kfree_rcu(psl, rcu);
2276 }
2277 rcu_assign_pointer(pmc->sflist, newpsl);
2278 psl = newpsl;
2279 }
2280 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2281 for (i = 0; i < psl->sl_count; i++) {
2282 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2283 sizeof(__be32));
2284 if (rv == 0)
2285 break;
2286 }
2287 if (rv == 0) /* address already there is an error */
2288 goto done;
2289 for (j = psl->sl_count-1; j >= i; j--)
2290 psl->sl_addr[j+1] = psl->sl_addr[j];
2291 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2292 psl->sl_count++;
2293 err = 0;
2294 /* update the interface list */
2295 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2296 &mreqs->imr_sourceaddr, 1);
2297 done:
2298 if (leavegroup)
2299 err = ip_mc_leave_group(sk, &imr);
2300 return err;
2301 }
2302
2303 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2304 {
2305 int err = 0;
2306 struct ip_mreqn imr;
2307 __be32 addr = msf->imsf_multiaddr;
2308 struct ip_mc_socklist *pmc;
2309 struct in_device *in_dev;
2310 struct inet_sock *inet = inet_sk(sk);
2311 struct ip_sf_socklist *newpsl, *psl;
2312 struct net *net = sock_net(sk);
2313 int leavegroup = 0;
2314
2315 if (!ipv4_is_multicast(addr))
2316 return -EINVAL;
2317 if (msf->imsf_fmode != MCAST_INCLUDE &&
2318 msf->imsf_fmode != MCAST_EXCLUDE)
2319 return -EINVAL;
2320
2321 ASSERT_RTNL();
2322
2323 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2324 imr.imr_address.s_addr = msf->imsf_interface;
2325 imr.imr_ifindex = ifindex;
2326 in_dev = ip_mc_find_dev(net, &imr);
2327
2328 if (!in_dev) {
2329 err = -ENODEV;
2330 goto done;
2331 }
2332
2333 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2334 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2335 leavegroup = 1;
2336 goto done;
2337 }
2338
2339 for_each_pmc_rtnl(inet, pmc) {
2340 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2341 pmc->multi.imr_ifindex == imr.imr_ifindex)
2342 break;
2343 }
2344 if (!pmc) { /* must have a prior join */
2345 err = -EINVAL;
2346 goto done;
2347 }
2348 if (msf->imsf_numsrc) {
2349 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2350 GFP_KERNEL);
2351 if (!newpsl) {
2352 err = -ENOBUFS;
2353 goto done;
2354 }
2355 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2356 memcpy(newpsl->sl_addr, msf->imsf_slist,
2357 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2358 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2359 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2360 if (err) {
2361 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2362 goto done;
2363 }
2364 } else {
2365 newpsl = NULL;
2366 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2367 msf->imsf_fmode, 0, NULL, 0);
2368 }
2369 psl = rtnl_dereference(pmc->sflist);
2370 if (psl) {
2371 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2372 psl->sl_count, psl->sl_addr, 0);
2373 /* decrease mem now to avoid the memleak warning */
2374 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2375 kfree_rcu(psl, rcu);
2376 } else
2377 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2378 0, NULL, 0);
2379 rcu_assign_pointer(pmc->sflist, newpsl);
2380 pmc->sfmode = msf->imsf_fmode;
2381 err = 0;
2382 done:
2383 if (leavegroup)
2384 err = ip_mc_leave_group(sk, &imr);
2385 return err;
2386 }
2387
2388 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2389 struct ip_msfilter __user *optval, int __user *optlen)
2390 {
2391 int err, len, count, copycount;
2392 struct ip_mreqn imr;
2393 __be32 addr = msf->imsf_multiaddr;
2394 struct ip_mc_socklist *pmc;
2395 struct in_device *in_dev;
2396 struct inet_sock *inet = inet_sk(sk);
2397 struct ip_sf_socklist *psl;
2398 struct net *net = sock_net(sk);
2399
2400 ASSERT_RTNL();
2401
2402 if (!ipv4_is_multicast(addr))
2403 return -EINVAL;
2404
2405 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2406 imr.imr_address.s_addr = msf->imsf_interface;
2407 imr.imr_ifindex = 0;
2408 in_dev = ip_mc_find_dev(net, &imr);
2409
2410 if (!in_dev) {
2411 err = -ENODEV;
2412 goto done;
2413 }
2414 err = -EADDRNOTAVAIL;
2415
2416 for_each_pmc_rtnl(inet, pmc) {
2417 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2418 pmc->multi.imr_ifindex == imr.imr_ifindex)
2419 break;
2420 }
2421 if (!pmc) /* must have a prior join */
2422 goto done;
2423 msf->imsf_fmode = pmc->sfmode;
2424 psl = rtnl_dereference(pmc->sflist);
2425 if (!psl) {
2426 len = 0;
2427 count = 0;
2428 } else {
2429 count = psl->sl_count;
2430 }
2431 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2432 len = copycount * sizeof(psl->sl_addr[0]);
2433 msf->imsf_numsrc = count;
2434 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2435 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2436 return -EFAULT;
2437 }
2438 if (len &&
2439 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2440 return -EFAULT;
2441 return 0;
2442 done:
2443 return err;
2444 }
2445
2446 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2447 struct group_filter __user *optval, int __user *optlen)
2448 {
2449 int err, i, count, copycount;
2450 struct sockaddr_in *psin;
2451 __be32 addr;
2452 struct ip_mc_socklist *pmc;
2453 struct inet_sock *inet = inet_sk(sk);
2454 struct ip_sf_socklist *psl;
2455
2456 ASSERT_RTNL();
2457
2458 psin = (struct sockaddr_in *)&gsf->gf_group;
2459 if (psin->sin_family != AF_INET)
2460 return -EINVAL;
2461 addr = psin->sin_addr.s_addr;
2462 if (!ipv4_is_multicast(addr))
2463 return -EINVAL;
2464
2465 err = -EADDRNOTAVAIL;
2466
2467 for_each_pmc_rtnl(inet, pmc) {
2468 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2469 pmc->multi.imr_ifindex == gsf->gf_interface)
2470 break;
2471 }
2472 if (!pmc) /* must have a prior join */
2473 goto done;
2474 gsf->gf_fmode = pmc->sfmode;
2475 psl = rtnl_dereference(pmc->sflist);
2476 count = psl ? psl->sl_count : 0;
2477 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2478 gsf->gf_numsrc = count;
2479 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2480 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2481 return -EFAULT;
2482 }
2483 for (i = 0; i < copycount; i++) {
2484 struct sockaddr_storage ss;
2485
2486 psin = (struct sockaddr_in *)&ss;
2487 memset(&ss, 0, sizeof(ss));
2488 psin->sin_family = AF_INET;
2489 psin->sin_addr.s_addr = psl->sl_addr[i];
2490 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2491 return -EFAULT;
2492 }
2493 return 0;
2494 done:
2495 return err;
2496 }
2497
2498 /*
2499 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2500 */
2501 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2502 {
2503 struct inet_sock *inet = inet_sk(sk);
2504 struct ip_mc_socklist *pmc;
2505 struct ip_sf_socklist *psl;
2506 int i;
2507 int ret;
2508
2509 ret = 1;
2510 if (!ipv4_is_multicast(loc_addr))
2511 goto out;
2512
2513 rcu_read_lock();
2514 for_each_pmc_rcu(inet, pmc) {
2515 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2516 pmc->multi.imr_ifindex == dif)
2517 break;
2518 }
2519 ret = inet->mc_all;
2520 if (!pmc)
2521 goto unlock;
2522 psl = rcu_dereference(pmc->sflist);
2523 ret = (pmc->sfmode == MCAST_EXCLUDE);
2524 if (!psl)
2525 goto unlock;
2526
2527 for (i = 0; i < psl->sl_count; i++) {
2528 if (psl->sl_addr[i] == rmt_addr)
2529 break;
2530 }
2531 ret = 0;
2532 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2533 goto unlock;
2534 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2535 goto unlock;
2536 ret = 1;
2537 unlock:
2538 rcu_read_unlock();
2539 out:
2540 return ret;
2541 }
2542
2543 /*
2544 * A socket is closing.
2545 */
2546
2547 void ip_mc_drop_socket(struct sock *sk)
2548 {
2549 struct inet_sock *inet = inet_sk(sk);
2550 struct ip_mc_socklist *iml;
2551 struct net *net = sock_net(sk);
2552
2553 if (!inet->mc_list)
2554 return;
2555
2556 rtnl_lock();
2557 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2558 struct in_device *in_dev;
2559
2560 inet->mc_list = iml->next_rcu;
2561 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2562 (void) ip_mc_leave_src(sk, iml, in_dev);
2563 if (in_dev)
2564 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2565 /* decrease mem now to avoid the memleak warning */
2566 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2567 kfree_rcu(iml, rcu);
2568 }
2569 rtnl_unlock();
2570 }
2571
2572 /* called with rcu_read_lock() */
2573 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2574 {
2575 struct ip_mc_list *im;
2576 struct ip_mc_list __rcu **mc_hash;
2577 struct ip_sf_list *psf;
2578 int rv = 0;
2579
2580 mc_hash = rcu_dereference(in_dev->mc_hash);
2581 if (mc_hash) {
2582 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2583
2584 for (im = rcu_dereference(mc_hash[hash]);
2585 im != NULL;
2586 im = rcu_dereference(im->next_hash)) {
2587 if (im->multiaddr == mc_addr)
2588 break;
2589 }
2590 } else {
2591 for_each_pmc_rcu(in_dev, im) {
2592 if (im->multiaddr == mc_addr)
2593 break;
2594 }
2595 }
2596 if (im && proto == IPPROTO_IGMP) {
2597 rv = 1;
2598 } else if (im) {
2599 if (src_addr) {
2600 for (psf = im->sources; psf; psf = psf->sf_next) {
2601 if (psf->sf_inaddr == src_addr)
2602 break;
2603 }
2604 if (psf)
2605 rv = psf->sf_count[MCAST_INCLUDE] ||
2606 psf->sf_count[MCAST_EXCLUDE] !=
2607 im->sfcount[MCAST_EXCLUDE];
2608 else
2609 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2610 } else
2611 rv = 1; /* unspecified source; tentatively allow */
2612 }
2613 return rv;
2614 }
2615
2616 #if defined(CONFIG_PROC_FS)
2617 struct igmp_mc_iter_state {
2618 struct seq_net_private p;
2619 struct net_device *dev;
2620 struct in_device *in_dev;
2621 };
2622
2623 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2624
2625 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2626 {
2627 struct net *net = seq_file_net(seq);
2628 struct ip_mc_list *im = NULL;
2629 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2630
2631 state->in_dev = NULL;
2632 for_each_netdev_rcu(net, state->dev) {
2633 struct in_device *in_dev;
2634
2635 in_dev = __in_dev_get_rcu(state->dev);
2636 if (!in_dev)
2637 continue;
2638 im = rcu_dereference(in_dev->mc_list);
2639 if (im) {
2640 state->in_dev = in_dev;
2641 break;
2642 }
2643 }
2644 return im;
2645 }
2646
2647 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2648 {
2649 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2650
2651 im = rcu_dereference(im->next_rcu);
2652 while (!im) {
2653 state->dev = next_net_device_rcu(state->dev);
2654 if (!state->dev) {
2655 state->in_dev = NULL;
2656 break;
2657 }
2658 state->in_dev = __in_dev_get_rcu(state->dev);
2659 if (!state->in_dev)
2660 continue;
2661 im = rcu_dereference(state->in_dev->mc_list);
2662 }
2663 return im;
2664 }
2665
2666 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2667 {
2668 struct ip_mc_list *im = igmp_mc_get_first(seq);
2669 if (im)
2670 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2671 --pos;
2672 return pos ? NULL : im;
2673 }
2674
2675 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2676 __acquires(rcu)
2677 {
2678 rcu_read_lock();
2679 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2680 }
2681
2682 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2683 {
2684 struct ip_mc_list *im;
2685 if (v == SEQ_START_TOKEN)
2686 im = igmp_mc_get_first(seq);
2687 else
2688 im = igmp_mc_get_next(seq, v);
2689 ++*pos;
2690 return im;
2691 }
2692
2693 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2694 __releases(rcu)
2695 {
2696 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2697
2698 state->in_dev = NULL;
2699 state->dev = NULL;
2700 rcu_read_unlock();
2701 }
2702
2703 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2704 {
2705 if (v == SEQ_START_TOKEN)
2706 seq_puts(seq,
2707 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2708 else {
2709 struct ip_mc_list *im = (struct ip_mc_list *)v;
2710 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2711 char *querier;
2712 long delta;
2713
2714 #ifdef CONFIG_IP_MULTICAST
2715 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2716 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2717 "V3";
2718 #else
2719 querier = "NONE";
2720 #endif
2721
2722 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2723 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2724 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2725 }
2726
2727 delta = im->timer.expires - jiffies;
2728 seq_printf(seq,
2729 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2730 im->multiaddr, im->users,
2731 im->tm_running,
2732 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2733 im->reporter);
2734 }
2735 return 0;
2736 }
2737
2738 static const struct seq_operations igmp_mc_seq_ops = {
2739 .start = igmp_mc_seq_start,
2740 .next = igmp_mc_seq_next,
2741 .stop = igmp_mc_seq_stop,
2742 .show = igmp_mc_seq_show,
2743 };
2744
2745 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2746 {
2747 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2748 sizeof(struct igmp_mc_iter_state));
2749 }
2750
2751 static const struct file_operations igmp_mc_seq_fops = {
2752 .owner = THIS_MODULE,
2753 .open = igmp_mc_seq_open,
2754 .read = seq_read,
2755 .llseek = seq_lseek,
2756 .release = seq_release_net,
2757 };
2758
2759 struct igmp_mcf_iter_state {
2760 struct seq_net_private p;
2761 struct net_device *dev;
2762 struct in_device *idev;
2763 struct ip_mc_list *im;
2764 };
2765
2766 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2767
2768 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2769 {
2770 struct net *net = seq_file_net(seq);
2771 struct ip_sf_list *psf = NULL;
2772 struct ip_mc_list *im = NULL;
2773 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2774
2775 state->idev = NULL;
2776 state->im = NULL;
2777 for_each_netdev_rcu(net, state->dev) {
2778 struct in_device *idev;
2779 idev = __in_dev_get_rcu(state->dev);
2780 if (unlikely(!idev))
2781 continue;
2782 im = rcu_dereference(idev->mc_list);
2783 if (likely(im)) {
2784 spin_lock_bh(&im->lock);
2785 psf = im->sources;
2786 if (likely(psf)) {
2787 state->im = im;
2788 state->idev = idev;
2789 break;
2790 }
2791 spin_unlock_bh(&im->lock);
2792 }
2793 }
2794 return psf;
2795 }
2796
2797 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2798 {
2799 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2800
2801 psf = psf->sf_next;
2802 while (!psf) {
2803 spin_unlock_bh(&state->im->lock);
2804 state->im = state->im->next;
2805 while (!state->im) {
2806 state->dev = next_net_device_rcu(state->dev);
2807 if (!state->dev) {
2808 state->idev = NULL;
2809 goto out;
2810 }
2811 state->idev = __in_dev_get_rcu(state->dev);
2812 if (!state->idev)
2813 continue;
2814 state->im = rcu_dereference(state->idev->mc_list);
2815 }
2816 if (!state->im)
2817 break;
2818 spin_lock_bh(&state->im->lock);
2819 psf = state->im->sources;
2820 }
2821 out:
2822 return psf;
2823 }
2824
2825 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2826 {
2827 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2828 if (psf)
2829 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2830 --pos;
2831 return pos ? NULL : psf;
2832 }
2833
2834 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2835 __acquires(rcu)
2836 {
2837 rcu_read_lock();
2838 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2839 }
2840
2841 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2842 {
2843 struct ip_sf_list *psf;
2844 if (v == SEQ_START_TOKEN)
2845 psf = igmp_mcf_get_first(seq);
2846 else
2847 psf = igmp_mcf_get_next(seq, v);
2848 ++*pos;
2849 return psf;
2850 }
2851
2852 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2853 __releases(rcu)
2854 {
2855 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2856 if (likely(state->im)) {
2857 spin_unlock_bh(&state->im->lock);
2858 state->im = NULL;
2859 }
2860 state->idev = NULL;
2861 state->dev = NULL;
2862 rcu_read_unlock();
2863 }
2864
2865 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2866 {
2867 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2868 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2869
2870 if (v == SEQ_START_TOKEN) {
2871 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2872 } else {
2873 seq_printf(seq,
2874 "%3d %6.6s 0x%08x "
2875 "0x%08x %6lu %6lu\n",
2876 state->dev->ifindex, state->dev->name,
2877 ntohl(state->im->multiaddr),
2878 ntohl(psf->sf_inaddr),
2879 psf->sf_count[MCAST_INCLUDE],
2880 psf->sf_count[MCAST_EXCLUDE]);
2881 }
2882 return 0;
2883 }
2884
2885 static const struct seq_operations igmp_mcf_seq_ops = {
2886 .start = igmp_mcf_seq_start,
2887 .next = igmp_mcf_seq_next,
2888 .stop = igmp_mcf_seq_stop,
2889 .show = igmp_mcf_seq_show,
2890 };
2891
2892 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2893 {
2894 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2895 sizeof(struct igmp_mcf_iter_state));
2896 }
2897
2898 static const struct file_operations igmp_mcf_seq_fops = {
2899 .owner = THIS_MODULE,
2900 .open = igmp_mcf_seq_open,
2901 .read = seq_read,
2902 .llseek = seq_lseek,
2903 .release = seq_release_net,
2904 };
2905
2906 static int __net_init igmp_net_init(struct net *net)
2907 {
2908 struct proc_dir_entry *pde;
2909 int err;
2910
2911 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2912 if (!pde)
2913 goto out_igmp;
2914 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2915 &igmp_mcf_seq_fops);
2916 if (!pde)
2917 goto out_mcfilter;
2918 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2919 SOCK_DGRAM, 0, net);
2920 if (err < 0) {
2921 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2922 err);
2923 goto out_sock;
2924 }
2925
2926 return 0;
2927
2928 out_sock:
2929 remove_proc_entry("mcfilter", net->proc_net);
2930 out_mcfilter:
2931 remove_proc_entry("igmp", net->proc_net);
2932 out_igmp:
2933 return -ENOMEM;
2934 }
2935
2936 static void __net_exit igmp_net_exit(struct net *net)
2937 {
2938 remove_proc_entry("mcfilter", net->proc_net);
2939 remove_proc_entry("igmp", net->proc_net);
2940 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2941 }
2942
2943 static struct pernet_operations igmp_net_ops = {
2944 .init = igmp_net_init,
2945 .exit = igmp_net_exit,
2946 };
2947 #endif
2948
2949 static int igmp_netdev_event(struct notifier_block *this,
2950 unsigned long event, void *ptr)
2951 {
2952 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2953 struct in_device *in_dev;
2954
2955 switch (event) {
2956 case NETDEV_RESEND_IGMP:
2957 in_dev = __in_dev_get_rtnl(dev);
2958 if (in_dev)
2959 ip_mc_rejoin_groups(in_dev);
2960 break;
2961 default:
2962 break;
2963 }
2964 return NOTIFY_DONE;
2965 }
2966
2967 static struct notifier_block igmp_notifier = {
2968 .notifier_call = igmp_netdev_event,
2969 };
2970
2971 int __init igmp_mc_init(void)
2972 {
2973 #if defined(CONFIG_PROC_FS)
2974 int err;
2975
2976 err = register_pernet_subsys(&igmp_net_ops);
2977 if (err)
2978 return err;
2979 err = register_netdevice_notifier(&igmp_notifier);
2980 if (err)
2981 goto reg_notif_fail;
2982 return 0;
2983
2984 reg_notif_fail:
2985 unregister_pernet_subsys(&igmp_net_ops);
2986 return err;
2987 #else
2988 return register_netdevice_notifier(&igmp_notifier);
2989 #endif
2990 }
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