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vfio/pci: Fix typos in comments
[deliverable/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 #ifdef CONFIG_IP_MULTICAST
111 /* Parameter names and values are taken from igmp-v2-06 draft */
112
113 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
114 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
115 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
116 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
117 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
118 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
119
120
121 #define IGMP_INITIAL_REPORT_DELAY (1)
122
123 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
128 */
129
130 #define IGMP_V1_SEEN(in_dev) \
131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135 #define IGMP_V2_SEEN(in_dev) \
136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
140
141 static int unsolicited_report_interval(struct in_device *in_dev)
142 {
143 int interval_ms, interval_jiffies;
144
145 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
146 interval_ms = IN_DEV_CONF_GET(
147 in_dev,
148 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
149 else /* v3 */
150 interval_ms = IN_DEV_CONF_GET(
151 in_dev,
152 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
153
154 interval_jiffies = msecs_to_jiffies(interval_ms);
155
156 /* _timer functions can't handle a delay of 0 jiffies so ensure
157 * we always return a positive value.
158 */
159 if (interval_jiffies <= 0)
160 interval_jiffies = 1;
161 return interval_jiffies;
162 }
163
164 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
165 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
166 static void igmpv3_clear_delrec(struct in_device *in_dev);
167 static int sf_setstate(struct ip_mc_list *pmc);
168 static void sf_markstate(struct ip_mc_list *pmc);
169 #endif
170 static void ip_mc_clear_src(struct ip_mc_list *pmc);
171 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
172 int sfcount, __be32 *psfsrc, int delta);
173
174 static void ip_ma_put(struct ip_mc_list *im)
175 {
176 if (atomic_dec_and_test(&im->refcnt)) {
177 in_dev_put(im->interface);
178 kfree_rcu(im, rcu);
179 }
180 }
181
182 #define for_each_pmc_rcu(in_dev, pmc) \
183 for (pmc = rcu_dereference(in_dev->mc_list); \
184 pmc != NULL; \
185 pmc = rcu_dereference(pmc->next_rcu))
186
187 #define for_each_pmc_rtnl(in_dev, pmc) \
188 for (pmc = rtnl_dereference(in_dev->mc_list); \
189 pmc != NULL; \
190 pmc = rtnl_dereference(pmc->next_rcu))
191
192 #ifdef CONFIG_IP_MULTICAST
193
194 /*
195 * Timer management
196 */
197
198 static void igmp_stop_timer(struct ip_mc_list *im)
199 {
200 spin_lock_bh(&im->lock);
201 if (del_timer(&im->timer))
202 atomic_dec(&im->refcnt);
203 im->tm_running = 0;
204 im->reporter = 0;
205 im->unsolicit_count = 0;
206 spin_unlock_bh(&im->lock);
207 }
208
209 /* It must be called with locked im->lock */
210 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
211 {
212 int tv = prandom_u32() % max_delay;
213
214 im->tm_running = 1;
215 if (!mod_timer(&im->timer, jiffies+tv+2))
216 atomic_inc(&im->refcnt);
217 }
218
219 static void igmp_gq_start_timer(struct in_device *in_dev)
220 {
221 int tv = prandom_u32() % in_dev->mr_maxdelay;
222
223 in_dev->mr_gq_running = 1;
224 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
225 in_dev_hold(in_dev);
226 }
227
228 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
229 {
230 int tv = prandom_u32() % delay;
231
232 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
233 in_dev_hold(in_dev);
234 }
235
236 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
237 {
238 spin_lock_bh(&im->lock);
239 im->unsolicit_count = 0;
240 if (del_timer(&im->timer)) {
241 if ((long)(im->timer.expires-jiffies) < max_delay) {
242 add_timer(&im->timer);
243 im->tm_running = 1;
244 spin_unlock_bh(&im->lock);
245 return;
246 }
247 atomic_dec(&im->refcnt);
248 }
249 igmp_start_timer(im, max_delay);
250 spin_unlock_bh(&im->lock);
251 }
252
253
254 /*
255 * Send an IGMP report.
256 */
257
258 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
259
260
261 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
262 int gdeleted, int sdeleted)
263 {
264 switch (type) {
265 case IGMPV3_MODE_IS_INCLUDE:
266 case IGMPV3_MODE_IS_EXCLUDE:
267 if (gdeleted || sdeleted)
268 return 0;
269 if (!(pmc->gsquery && !psf->sf_gsresp)) {
270 if (pmc->sfmode == MCAST_INCLUDE)
271 return 1;
272 /* don't include if this source is excluded
273 * in all filters
274 */
275 if (psf->sf_count[MCAST_INCLUDE])
276 return type == IGMPV3_MODE_IS_INCLUDE;
277 return pmc->sfcount[MCAST_EXCLUDE] ==
278 psf->sf_count[MCAST_EXCLUDE];
279 }
280 return 0;
281 case IGMPV3_CHANGE_TO_INCLUDE:
282 if (gdeleted || sdeleted)
283 return 0;
284 return psf->sf_count[MCAST_INCLUDE] != 0;
285 case IGMPV3_CHANGE_TO_EXCLUDE:
286 if (gdeleted || sdeleted)
287 return 0;
288 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
289 psf->sf_count[MCAST_INCLUDE])
290 return 0;
291 return pmc->sfcount[MCAST_EXCLUDE] ==
292 psf->sf_count[MCAST_EXCLUDE];
293 case IGMPV3_ALLOW_NEW_SOURCES:
294 if (gdeleted || !psf->sf_crcount)
295 return 0;
296 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
297 case IGMPV3_BLOCK_OLD_SOURCES:
298 if (pmc->sfmode == MCAST_INCLUDE)
299 return gdeleted || (psf->sf_crcount && sdeleted);
300 return psf->sf_crcount && !gdeleted && !sdeleted;
301 }
302 return 0;
303 }
304
305 static int
306 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
307 {
308 struct ip_sf_list *psf;
309 int scount = 0;
310
311 for (psf = pmc->sources; psf; psf = psf->sf_next) {
312 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
313 continue;
314 scount++;
315 }
316 return scount;
317 }
318
319 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
320 {
321 struct sk_buff *skb;
322 struct rtable *rt;
323 struct iphdr *pip;
324 struct igmpv3_report *pig;
325 struct net *net = dev_net(dev);
326 struct flowi4 fl4;
327 int hlen = LL_RESERVED_SPACE(dev);
328 int tlen = dev->needed_tailroom;
329 unsigned int size = mtu;
330
331 while (1) {
332 skb = alloc_skb(size + hlen + tlen,
333 GFP_ATOMIC | __GFP_NOWARN);
334 if (skb)
335 break;
336 size >>= 1;
337 if (size < 256)
338 return NULL;
339 }
340 skb->priority = TC_PRIO_CONTROL;
341
342 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
343 0, 0,
344 IPPROTO_IGMP, 0, dev->ifindex);
345 if (IS_ERR(rt)) {
346 kfree_skb(skb);
347 return NULL;
348 }
349
350 skb_dst_set(skb, &rt->dst);
351 skb->dev = dev;
352
353 skb_reserve(skb, hlen);
354 skb_tailroom_reserve(skb, mtu, tlen);
355
356 skb_reset_network_header(skb);
357 pip = ip_hdr(skb);
358 skb_put(skb, sizeof(struct iphdr) + 4);
359
360 pip->version = 4;
361 pip->ihl = (sizeof(struct iphdr)+4)>>2;
362 pip->tos = 0xc0;
363 pip->frag_off = htons(IP_DF);
364 pip->ttl = 1;
365 pip->daddr = fl4.daddr;
366 pip->saddr = fl4.saddr;
367 pip->protocol = IPPROTO_IGMP;
368 pip->tot_len = 0; /* filled in later */
369 ip_select_ident(net, skb, NULL);
370 ((u8 *)&pip[1])[0] = IPOPT_RA;
371 ((u8 *)&pip[1])[1] = 4;
372 ((u8 *)&pip[1])[2] = 0;
373 ((u8 *)&pip[1])[3] = 0;
374
375 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
376 skb_put(skb, sizeof(*pig));
377 pig = igmpv3_report_hdr(skb);
378 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
379 pig->resv1 = 0;
380 pig->csum = 0;
381 pig->resv2 = 0;
382 pig->ngrec = 0;
383 return skb;
384 }
385
386 static int igmpv3_sendpack(struct sk_buff *skb)
387 {
388 struct igmphdr *pig = igmp_hdr(skb);
389 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
390
391 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
392
393 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
394 }
395
396 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
397 {
398 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
399 }
400
401 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
402 int type, struct igmpv3_grec **ppgr)
403 {
404 struct net_device *dev = pmc->interface->dev;
405 struct igmpv3_report *pih;
406 struct igmpv3_grec *pgr;
407
408 if (!skb)
409 skb = igmpv3_newpack(dev, dev->mtu);
410 if (!skb)
411 return NULL;
412 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
413 pgr->grec_type = type;
414 pgr->grec_auxwords = 0;
415 pgr->grec_nsrcs = 0;
416 pgr->grec_mca = pmc->multiaddr;
417 pih = igmpv3_report_hdr(skb);
418 pih->ngrec = htons(ntohs(pih->ngrec)+1);
419 *ppgr = pgr;
420 return skb;
421 }
422
423 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
424
425 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
426 int type, int gdeleted, int sdeleted)
427 {
428 struct net_device *dev = pmc->interface->dev;
429 struct net *net = dev_net(dev);
430 struct igmpv3_report *pih;
431 struct igmpv3_grec *pgr = NULL;
432 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
433 int scount, stotal, first, isquery, truncate;
434
435 if (pmc->multiaddr == IGMP_ALL_HOSTS)
436 return skb;
437 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
438 return skb;
439
440 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
441 type == IGMPV3_MODE_IS_EXCLUDE;
442 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
443 type == IGMPV3_CHANGE_TO_EXCLUDE;
444
445 stotal = scount = 0;
446
447 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
448
449 if (!*psf_list)
450 goto empty_source;
451
452 pih = skb ? igmpv3_report_hdr(skb) : NULL;
453
454 /* EX and TO_EX get a fresh packet, if needed */
455 if (truncate) {
456 if (pih && pih->ngrec &&
457 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
458 if (skb)
459 igmpv3_sendpack(skb);
460 skb = igmpv3_newpack(dev, dev->mtu);
461 }
462 }
463 first = 1;
464 psf_prev = NULL;
465 for (psf = *psf_list; psf; psf = psf_next) {
466 __be32 *psrc;
467
468 psf_next = psf->sf_next;
469
470 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
471 psf_prev = psf;
472 continue;
473 }
474
475 /* clear marks on query responses */
476 if (isquery)
477 psf->sf_gsresp = 0;
478
479 if (AVAILABLE(skb) < sizeof(__be32) +
480 first*sizeof(struct igmpv3_grec)) {
481 if (truncate && !first)
482 break; /* truncate these */
483 if (pgr)
484 pgr->grec_nsrcs = htons(scount);
485 if (skb)
486 igmpv3_sendpack(skb);
487 skb = igmpv3_newpack(dev, dev->mtu);
488 first = 1;
489 scount = 0;
490 }
491 if (first) {
492 skb = add_grhead(skb, pmc, type, &pgr);
493 first = 0;
494 }
495 if (!skb)
496 return NULL;
497 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
498 *psrc = psf->sf_inaddr;
499 scount++; stotal++;
500 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
501 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
502 psf->sf_crcount--;
503 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
504 if (psf_prev)
505 psf_prev->sf_next = psf->sf_next;
506 else
507 *psf_list = psf->sf_next;
508 kfree(psf);
509 continue;
510 }
511 }
512 psf_prev = psf;
513 }
514
515 empty_source:
516 if (!stotal) {
517 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
518 type == IGMPV3_BLOCK_OLD_SOURCES)
519 return skb;
520 if (pmc->crcount || isquery) {
521 /* make sure we have room for group header */
522 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
523 igmpv3_sendpack(skb);
524 skb = NULL; /* add_grhead will get a new one */
525 }
526 skb = add_grhead(skb, pmc, type, &pgr);
527 }
528 }
529 if (pgr)
530 pgr->grec_nsrcs = htons(scount);
531
532 if (isquery)
533 pmc->gsquery = 0; /* clear query state on report */
534 return skb;
535 }
536
537 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
538 {
539 struct sk_buff *skb = NULL;
540 struct net *net = dev_net(in_dev->dev);
541 int type;
542
543 if (!pmc) {
544 rcu_read_lock();
545 for_each_pmc_rcu(in_dev, pmc) {
546 if (pmc->multiaddr == IGMP_ALL_HOSTS)
547 continue;
548 if (ipv4_is_local_multicast(pmc->multiaddr) &&
549 !net->ipv4.sysctl_igmp_llm_reports)
550 continue;
551 spin_lock_bh(&pmc->lock);
552 if (pmc->sfcount[MCAST_EXCLUDE])
553 type = IGMPV3_MODE_IS_EXCLUDE;
554 else
555 type = IGMPV3_MODE_IS_INCLUDE;
556 skb = add_grec(skb, pmc, type, 0, 0);
557 spin_unlock_bh(&pmc->lock);
558 }
559 rcu_read_unlock();
560 } else {
561 spin_lock_bh(&pmc->lock);
562 if (pmc->sfcount[MCAST_EXCLUDE])
563 type = IGMPV3_MODE_IS_EXCLUDE;
564 else
565 type = IGMPV3_MODE_IS_INCLUDE;
566 skb = add_grec(skb, pmc, type, 0, 0);
567 spin_unlock_bh(&pmc->lock);
568 }
569 if (!skb)
570 return 0;
571 return igmpv3_sendpack(skb);
572 }
573
574 /*
575 * remove zero-count source records from a source filter list
576 */
577 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
578 {
579 struct ip_sf_list *psf_prev, *psf_next, *psf;
580
581 psf_prev = NULL;
582 for (psf = *ppsf; psf; psf = psf_next) {
583 psf_next = psf->sf_next;
584 if (psf->sf_crcount == 0) {
585 if (psf_prev)
586 psf_prev->sf_next = psf->sf_next;
587 else
588 *ppsf = psf->sf_next;
589 kfree(psf);
590 } else
591 psf_prev = psf;
592 }
593 }
594
595 static void igmpv3_send_cr(struct in_device *in_dev)
596 {
597 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
598 struct sk_buff *skb = NULL;
599 int type, dtype;
600
601 rcu_read_lock();
602 spin_lock_bh(&in_dev->mc_tomb_lock);
603
604 /* deleted MCA's */
605 pmc_prev = NULL;
606 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
607 pmc_next = pmc->next;
608 if (pmc->sfmode == MCAST_INCLUDE) {
609 type = IGMPV3_BLOCK_OLD_SOURCES;
610 dtype = IGMPV3_BLOCK_OLD_SOURCES;
611 skb = add_grec(skb, pmc, type, 1, 0);
612 skb = add_grec(skb, pmc, dtype, 1, 1);
613 }
614 if (pmc->crcount) {
615 if (pmc->sfmode == MCAST_EXCLUDE) {
616 type = IGMPV3_CHANGE_TO_INCLUDE;
617 skb = add_grec(skb, pmc, type, 1, 0);
618 }
619 pmc->crcount--;
620 if (pmc->crcount == 0) {
621 igmpv3_clear_zeros(&pmc->tomb);
622 igmpv3_clear_zeros(&pmc->sources);
623 }
624 }
625 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
626 if (pmc_prev)
627 pmc_prev->next = pmc_next;
628 else
629 in_dev->mc_tomb = pmc_next;
630 in_dev_put(pmc->interface);
631 kfree(pmc);
632 } else
633 pmc_prev = pmc;
634 }
635 spin_unlock_bh(&in_dev->mc_tomb_lock);
636
637 /* change recs */
638 for_each_pmc_rcu(in_dev, pmc) {
639 spin_lock_bh(&pmc->lock);
640 if (pmc->sfcount[MCAST_EXCLUDE]) {
641 type = IGMPV3_BLOCK_OLD_SOURCES;
642 dtype = IGMPV3_ALLOW_NEW_SOURCES;
643 } else {
644 type = IGMPV3_ALLOW_NEW_SOURCES;
645 dtype = IGMPV3_BLOCK_OLD_SOURCES;
646 }
647 skb = add_grec(skb, pmc, type, 0, 0);
648 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
649
650 /* filter mode changes */
651 if (pmc->crcount) {
652 if (pmc->sfmode == MCAST_EXCLUDE)
653 type = IGMPV3_CHANGE_TO_EXCLUDE;
654 else
655 type = IGMPV3_CHANGE_TO_INCLUDE;
656 skb = add_grec(skb, pmc, type, 0, 0);
657 pmc->crcount--;
658 }
659 spin_unlock_bh(&pmc->lock);
660 }
661 rcu_read_unlock();
662
663 if (!skb)
664 return;
665 (void) igmpv3_sendpack(skb);
666 }
667
668 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
669 int type)
670 {
671 struct sk_buff *skb;
672 struct iphdr *iph;
673 struct igmphdr *ih;
674 struct rtable *rt;
675 struct net_device *dev = in_dev->dev;
676 struct net *net = dev_net(dev);
677 __be32 group = pmc ? pmc->multiaddr : 0;
678 struct flowi4 fl4;
679 __be32 dst;
680 int hlen, tlen;
681
682 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
683 return igmpv3_send_report(in_dev, pmc);
684
685 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
686 return 0;
687
688 if (type == IGMP_HOST_LEAVE_MESSAGE)
689 dst = IGMP_ALL_ROUTER;
690 else
691 dst = group;
692
693 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
694 0, 0,
695 IPPROTO_IGMP, 0, dev->ifindex);
696 if (IS_ERR(rt))
697 return -1;
698
699 hlen = LL_RESERVED_SPACE(dev);
700 tlen = dev->needed_tailroom;
701 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
702 if (!skb) {
703 ip_rt_put(rt);
704 return -1;
705 }
706 skb->priority = TC_PRIO_CONTROL;
707
708 skb_dst_set(skb, &rt->dst);
709
710 skb_reserve(skb, hlen);
711
712 skb_reset_network_header(skb);
713 iph = ip_hdr(skb);
714 skb_put(skb, sizeof(struct iphdr) + 4);
715
716 iph->version = 4;
717 iph->ihl = (sizeof(struct iphdr)+4)>>2;
718 iph->tos = 0xc0;
719 iph->frag_off = htons(IP_DF);
720 iph->ttl = 1;
721 iph->daddr = dst;
722 iph->saddr = fl4.saddr;
723 iph->protocol = IPPROTO_IGMP;
724 ip_select_ident(net, skb, NULL);
725 ((u8 *)&iph[1])[0] = IPOPT_RA;
726 ((u8 *)&iph[1])[1] = 4;
727 ((u8 *)&iph[1])[2] = 0;
728 ((u8 *)&iph[1])[3] = 0;
729
730 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
731 ih->type = type;
732 ih->code = 0;
733 ih->csum = 0;
734 ih->group = group;
735 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
736
737 return ip_local_out(net, skb->sk, skb);
738 }
739
740 static void igmp_gq_timer_expire(unsigned long data)
741 {
742 struct in_device *in_dev = (struct in_device *)data;
743
744 in_dev->mr_gq_running = 0;
745 igmpv3_send_report(in_dev, NULL);
746 in_dev_put(in_dev);
747 }
748
749 static void igmp_ifc_timer_expire(unsigned long data)
750 {
751 struct in_device *in_dev = (struct in_device *)data;
752
753 igmpv3_send_cr(in_dev);
754 if (in_dev->mr_ifc_count) {
755 in_dev->mr_ifc_count--;
756 igmp_ifc_start_timer(in_dev,
757 unsolicited_report_interval(in_dev));
758 }
759 in_dev_put(in_dev);
760 }
761
762 static void igmp_ifc_event(struct in_device *in_dev)
763 {
764 struct net *net = dev_net(in_dev->dev);
765 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
766 return;
767 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
768 igmp_ifc_start_timer(in_dev, 1);
769 }
770
771
772 static void igmp_timer_expire(unsigned long data)
773 {
774 struct ip_mc_list *im = (struct ip_mc_list *)data;
775 struct in_device *in_dev = im->interface;
776
777 spin_lock(&im->lock);
778 im->tm_running = 0;
779
780 if (im->unsolicit_count) {
781 im->unsolicit_count--;
782 igmp_start_timer(im, unsolicited_report_interval(in_dev));
783 }
784 im->reporter = 1;
785 spin_unlock(&im->lock);
786
787 if (IGMP_V1_SEEN(in_dev))
788 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
789 else if (IGMP_V2_SEEN(in_dev))
790 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
791 else
792 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
793
794 ip_ma_put(im);
795 }
796
797 /* mark EXCLUDE-mode sources */
798 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
799 {
800 struct ip_sf_list *psf;
801 int i, scount;
802
803 scount = 0;
804 for (psf = pmc->sources; psf; psf = psf->sf_next) {
805 if (scount == nsrcs)
806 break;
807 for (i = 0; i < nsrcs; i++) {
808 /* skip inactive filters */
809 if (psf->sf_count[MCAST_INCLUDE] ||
810 pmc->sfcount[MCAST_EXCLUDE] !=
811 psf->sf_count[MCAST_EXCLUDE])
812 break;
813 if (srcs[i] == psf->sf_inaddr) {
814 scount++;
815 break;
816 }
817 }
818 }
819 pmc->gsquery = 0;
820 if (scount == nsrcs) /* all sources excluded */
821 return 0;
822 return 1;
823 }
824
825 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
826 {
827 struct ip_sf_list *psf;
828 int i, scount;
829
830 if (pmc->sfmode == MCAST_EXCLUDE)
831 return igmp_xmarksources(pmc, nsrcs, srcs);
832
833 /* mark INCLUDE-mode sources */
834 scount = 0;
835 for (psf = pmc->sources; psf; psf = psf->sf_next) {
836 if (scount == nsrcs)
837 break;
838 for (i = 0; i < nsrcs; i++)
839 if (srcs[i] == psf->sf_inaddr) {
840 psf->sf_gsresp = 1;
841 scount++;
842 break;
843 }
844 }
845 if (!scount) {
846 pmc->gsquery = 0;
847 return 0;
848 }
849 pmc->gsquery = 1;
850 return 1;
851 }
852
853 /* return true if packet was dropped */
854 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
855 {
856 struct ip_mc_list *im;
857 struct net *net = dev_net(in_dev->dev);
858
859 /* Timers are only set for non-local groups */
860
861 if (group == IGMP_ALL_HOSTS)
862 return false;
863 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
864 return false;
865
866 rcu_read_lock();
867 for_each_pmc_rcu(in_dev, im) {
868 if (im->multiaddr == group) {
869 igmp_stop_timer(im);
870 break;
871 }
872 }
873 rcu_read_unlock();
874 return false;
875 }
876
877 /* return true if packet was dropped */
878 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
879 int len)
880 {
881 struct igmphdr *ih = igmp_hdr(skb);
882 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
883 struct ip_mc_list *im;
884 __be32 group = ih->group;
885 int max_delay;
886 int mark = 0;
887 struct net *net = dev_net(in_dev->dev);
888
889
890 if (len == 8) {
891 if (ih->code == 0) {
892 /* Alas, old v1 router presents here. */
893
894 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
895 in_dev->mr_v1_seen = jiffies +
896 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
897 group = 0;
898 } else {
899 /* v2 router present */
900 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
901 in_dev->mr_v2_seen = jiffies +
902 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
903 }
904 /* cancel the interface change timer */
905 in_dev->mr_ifc_count = 0;
906 if (del_timer(&in_dev->mr_ifc_timer))
907 __in_dev_put(in_dev);
908 /* clear deleted report items */
909 igmpv3_clear_delrec(in_dev);
910 } else if (len < 12) {
911 return true; /* ignore bogus packet; freed by caller */
912 } else if (IGMP_V1_SEEN(in_dev)) {
913 /* This is a v3 query with v1 queriers present */
914 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
915 group = 0;
916 } else if (IGMP_V2_SEEN(in_dev)) {
917 /* this is a v3 query with v2 queriers present;
918 * Interpretation of the max_delay code is problematic here.
919 * A real v2 host would use ih_code directly, while v3 has a
920 * different encoding. We use the v3 encoding as more likely
921 * to be intended in a v3 query.
922 */
923 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
924 if (!max_delay)
925 max_delay = 1; /* can't mod w/ 0 */
926 } else { /* v3 */
927 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
928 return true;
929
930 ih3 = igmpv3_query_hdr(skb);
931 if (ih3->nsrcs) {
932 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
933 + ntohs(ih3->nsrcs)*sizeof(__be32)))
934 return true;
935 ih3 = igmpv3_query_hdr(skb);
936 }
937
938 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
939 if (!max_delay)
940 max_delay = 1; /* can't mod w/ 0 */
941 in_dev->mr_maxdelay = max_delay;
942 if (ih3->qrv)
943 in_dev->mr_qrv = ih3->qrv;
944 if (!group) { /* general query */
945 if (ih3->nsrcs)
946 return true; /* no sources allowed */
947 igmp_gq_start_timer(in_dev);
948 return false;
949 }
950 /* mark sources to include, if group & source-specific */
951 mark = ih3->nsrcs != 0;
952 }
953
954 /*
955 * - Start the timers in all of our membership records
956 * that the query applies to for the interface on
957 * which the query arrived excl. those that belong
958 * to a "local" group (224.0.0.X)
959 * - For timers already running check if they need to
960 * be reset.
961 * - Use the igmp->igmp_code field as the maximum
962 * delay possible
963 */
964 rcu_read_lock();
965 for_each_pmc_rcu(in_dev, im) {
966 int changed;
967
968 if (group && group != im->multiaddr)
969 continue;
970 if (im->multiaddr == IGMP_ALL_HOSTS)
971 continue;
972 if (ipv4_is_local_multicast(im->multiaddr) &&
973 !net->ipv4.sysctl_igmp_llm_reports)
974 continue;
975 spin_lock_bh(&im->lock);
976 if (im->tm_running)
977 im->gsquery = im->gsquery && mark;
978 else
979 im->gsquery = mark;
980 changed = !im->gsquery ||
981 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
982 spin_unlock_bh(&im->lock);
983 if (changed)
984 igmp_mod_timer(im, max_delay);
985 }
986 rcu_read_unlock();
987 return false;
988 }
989
990 /* called in rcu_read_lock() section */
991 int igmp_rcv(struct sk_buff *skb)
992 {
993 /* This basically follows the spec line by line -- see RFC1112 */
994 struct igmphdr *ih;
995 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
996 int len = skb->len;
997 bool dropped = true;
998
999 if (!in_dev)
1000 goto drop;
1001
1002 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1003 goto drop;
1004
1005 if (skb_checksum_simple_validate(skb))
1006 goto drop;
1007
1008 ih = igmp_hdr(skb);
1009 switch (ih->type) {
1010 case IGMP_HOST_MEMBERSHIP_QUERY:
1011 dropped = igmp_heard_query(in_dev, skb, len);
1012 break;
1013 case IGMP_HOST_MEMBERSHIP_REPORT:
1014 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1015 /* Is it our report looped back? */
1016 if (rt_is_output_route(skb_rtable(skb)))
1017 break;
1018 /* don't rely on MC router hearing unicast reports */
1019 if (skb->pkt_type == PACKET_MULTICAST ||
1020 skb->pkt_type == PACKET_BROADCAST)
1021 dropped = igmp_heard_report(in_dev, ih->group);
1022 break;
1023 case IGMP_PIM:
1024 #ifdef CONFIG_IP_PIMSM_V1
1025 return pim_rcv_v1(skb);
1026 #endif
1027 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1028 case IGMP_DVMRP:
1029 case IGMP_TRACE:
1030 case IGMP_HOST_LEAVE_MESSAGE:
1031 case IGMP_MTRACE:
1032 case IGMP_MTRACE_RESP:
1033 break;
1034 default:
1035 break;
1036 }
1037
1038 drop:
1039 if (dropped)
1040 kfree_skb(skb);
1041 else
1042 consume_skb(skb);
1043 return 0;
1044 }
1045
1046 #endif
1047
1048
1049 /*
1050 * Add a filter to a device
1051 */
1052
1053 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1054 {
1055 char buf[MAX_ADDR_LEN];
1056 struct net_device *dev = in_dev->dev;
1057
1058 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1059 We will get multicast token leakage, when IFF_MULTICAST
1060 is changed. This check should be done in ndo_set_rx_mode
1061 routine. Something sort of:
1062 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1063 --ANK
1064 */
1065 if (arp_mc_map(addr, buf, dev, 0) == 0)
1066 dev_mc_add(dev, buf);
1067 }
1068
1069 /*
1070 * Remove a filter from a device
1071 */
1072
1073 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1074 {
1075 char buf[MAX_ADDR_LEN];
1076 struct net_device *dev = in_dev->dev;
1077
1078 if (arp_mc_map(addr, buf, dev, 0) == 0)
1079 dev_mc_del(dev, buf);
1080 }
1081
1082 #ifdef CONFIG_IP_MULTICAST
1083 /*
1084 * deleted ip_mc_list manipulation
1085 */
1086 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1087 {
1088 struct ip_mc_list *pmc;
1089 struct net *net = dev_net(in_dev->dev);
1090
1091 /* this is an "ip_mc_list" for convenience; only the fields below
1092 * are actually used. In particular, the refcnt and users are not
1093 * used for management of the delete list. Using the same structure
1094 * for deleted items allows change reports to use common code with
1095 * non-deleted or query-response MCA's.
1096 */
1097 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1098 if (!pmc)
1099 return;
1100 spin_lock_bh(&im->lock);
1101 pmc->interface = im->interface;
1102 in_dev_hold(in_dev);
1103 pmc->multiaddr = im->multiaddr;
1104 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1105 pmc->sfmode = im->sfmode;
1106 if (pmc->sfmode == MCAST_INCLUDE) {
1107 struct ip_sf_list *psf;
1108
1109 pmc->tomb = im->tomb;
1110 pmc->sources = im->sources;
1111 im->tomb = im->sources = NULL;
1112 for (psf = pmc->sources; psf; psf = psf->sf_next)
1113 psf->sf_crcount = pmc->crcount;
1114 }
1115 spin_unlock_bh(&im->lock);
1116
1117 spin_lock_bh(&in_dev->mc_tomb_lock);
1118 pmc->next = in_dev->mc_tomb;
1119 in_dev->mc_tomb = pmc;
1120 spin_unlock_bh(&in_dev->mc_tomb_lock);
1121 }
1122
1123 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1124 {
1125 struct ip_mc_list *pmc, *pmc_prev;
1126 struct ip_sf_list *psf, *psf_next;
1127
1128 spin_lock_bh(&in_dev->mc_tomb_lock);
1129 pmc_prev = NULL;
1130 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1131 if (pmc->multiaddr == multiaddr)
1132 break;
1133 pmc_prev = pmc;
1134 }
1135 if (pmc) {
1136 if (pmc_prev)
1137 pmc_prev->next = pmc->next;
1138 else
1139 in_dev->mc_tomb = pmc->next;
1140 }
1141 spin_unlock_bh(&in_dev->mc_tomb_lock);
1142 if (pmc) {
1143 for (psf = pmc->tomb; psf; psf = psf_next) {
1144 psf_next = psf->sf_next;
1145 kfree(psf);
1146 }
1147 in_dev_put(pmc->interface);
1148 kfree(pmc);
1149 }
1150 }
1151
1152 static void igmpv3_clear_delrec(struct in_device *in_dev)
1153 {
1154 struct ip_mc_list *pmc, *nextpmc;
1155
1156 spin_lock_bh(&in_dev->mc_tomb_lock);
1157 pmc = in_dev->mc_tomb;
1158 in_dev->mc_tomb = NULL;
1159 spin_unlock_bh(&in_dev->mc_tomb_lock);
1160
1161 for (; pmc; pmc = nextpmc) {
1162 nextpmc = pmc->next;
1163 ip_mc_clear_src(pmc);
1164 in_dev_put(pmc->interface);
1165 kfree(pmc);
1166 }
1167 /* clear dead sources, too */
1168 rcu_read_lock();
1169 for_each_pmc_rcu(in_dev, pmc) {
1170 struct ip_sf_list *psf, *psf_next;
1171
1172 spin_lock_bh(&pmc->lock);
1173 psf = pmc->tomb;
1174 pmc->tomb = NULL;
1175 spin_unlock_bh(&pmc->lock);
1176 for (; psf; psf = psf_next) {
1177 psf_next = psf->sf_next;
1178 kfree(psf);
1179 }
1180 }
1181 rcu_read_unlock();
1182 }
1183 #endif
1184
1185 static void igmp_group_dropped(struct ip_mc_list *im)
1186 {
1187 struct in_device *in_dev = im->interface;
1188 #ifdef CONFIG_IP_MULTICAST
1189 struct net *net = dev_net(in_dev->dev);
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) && !net->ipv4.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 #ifdef CONFIG_IP_MULTICAST
1227 struct net *net = dev_net(in_dev->dev);
1228 #endif
1229
1230 if (im->loaded == 0) {
1231 im->loaded = 1;
1232 ip_mc_filter_add(in_dev, im->multiaddr);
1233 }
1234
1235 #ifdef CONFIG_IP_MULTICAST
1236 if (im->multiaddr == IGMP_ALL_HOSTS)
1237 return;
1238 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1239 return;
1240
1241 if (in_dev->dead)
1242 return;
1243 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1244 spin_lock_bh(&im->lock);
1245 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1246 spin_unlock_bh(&im->lock);
1247 return;
1248 }
1249 /* else, v3 */
1250
1251 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1252 igmp_ifc_event(in_dev);
1253 #endif
1254 }
1255
1256
1257 /*
1258 * Multicast list managers
1259 */
1260
1261 static u32 ip_mc_hash(const struct ip_mc_list *im)
1262 {
1263 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1264 }
1265
1266 static void ip_mc_hash_add(struct in_device *in_dev,
1267 struct ip_mc_list *im)
1268 {
1269 struct ip_mc_list __rcu **mc_hash;
1270 u32 hash;
1271
1272 mc_hash = rtnl_dereference(in_dev->mc_hash);
1273 if (mc_hash) {
1274 hash = ip_mc_hash(im);
1275 im->next_hash = mc_hash[hash];
1276 rcu_assign_pointer(mc_hash[hash], im);
1277 return;
1278 }
1279
1280 /* do not use a hash table for small number of items */
1281 if (in_dev->mc_count < 4)
1282 return;
1283
1284 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1285 GFP_KERNEL);
1286 if (!mc_hash)
1287 return;
1288
1289 for_each_pmc_rtnl(in_dev, im) {
1290 hash = ip_mc_hash(im);
1291 im->next_hash = mc_hash[hash];
1292 RCU_INIT_POINTER(mc_hash[hash], im);
1293 }
1294
1295 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1296 }
1297
1298 static void ip_mc_hash_remove(struct in_device *in_dev,
1299 struct ip_mc_list *im)
1300 {
1301 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1302 struct ip_mc_list *aux;
1303
1304 if (!mc_hash)
1305 return;
1306 mc_hash += ip_mc_hash(im);
1307 while ((aux = rtnl_dereference(*mc_hash)) != im)
1308 mc_hash = &aux->next_hash;
1309 *mc_hash = im->next_hash;
1310 }
1311
1312
1313 /*
1314 * A socket has joined a multicast group on device dev.
1315 */
1316
1317 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1318 {
1319 struct ip_mc_list *im;
1320 #ifdef CONFIG_IP_MULTICAST
1321 struct net *net = dev_net(in_dev->dev);
1322 #endif
1323
1324 ASSERT_RTNL();
1325
1326 for_each_pmc_rtnl(in_dev, im) {
1327 if (im->multiaddr == addr) {
1328 im->users++;
1329 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1330 goto out;
1331 }
1332 }
1333
1334 im = kzalloc(sizeof(*im), GFP_KERNEL);
1335 if (!im)
1336 goto out;
1337
1338 im->users = 1;
1339 im->interface = in_dev;
1340 in_dev_hold(in_dev);
1341 im->multiaddr = addr;
1342 /* initial mode is (EX, empty) */
1343 im->sfmode = MCAST_EXCLUDE;
1344 im->sfcount[MCAST_EXCLUDE] = 1;
1345 atomic_set(&im->refcnt, 1);
1346 spin_lock_init(&im->lock);
1347 #ifdef CONFIG_IP_MULTICAST
1348 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1349 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1350 #endif
1351
1352 im->next_rcu = in_dev->mc_list;
1353 in_dev->mc_count++;
1354 rcu_assign_pointer(in_dev->mc_list, im);
1355
1356 ip_mc_hash_add(in_dev, im);
1357
1358 #ifdef CONFIG_IP_MULTICAST
1359 igmpv3_del_delrec(in_dev, im->multiaddr);
1360 #endif
1361 igmp_group_added(im);
1362 if (!in_dev->dead)
1363 ip_rt_multicast_event(in_dev);
1364 out:
1365 return;
1366 }
1367 EXPORT_SYMBOL(ip_mc_inc_group);
1368
1369 static int ip_mc_check_iphdr(struct sk_buff *skb)
1370 {
1371 const struct iphdr *iph;
1372 unsigned int len;
1373 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1374
1375 if (!pskb_may_pull(skb, offset))
1376 return -EINVAL;
1377
1378 iph = ip_hdr(skb);
1379
1380 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1381 return -EINVAL;
1382
1383 offset += ip_hdrlen(skb) - sizeof(*iph);
1384
1385 if (!pskb_may_pull(skb, offset))
1386 return -EINVAL;
1387
1388 iph = ip_hdr(skb);
1389
1390 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1391 return -EINVAL;
1392
1393 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1394 if (skb->len < len || len < offset)
1395 return -EINVAL;
1396
1397 skb_set_transport_header(skb, offset);
1398
1399 return 0;
1400 }
1401
1402 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1403 {
1404 unsigned int len = skb_transport_offset(skb);
1405
1406 len += sizeof(struct igmpv3_report);
1407
1408 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1409 }
1410
1411 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1412 {
1413 unsigned int len = skb_transport_offset(skb);
1414
1415 len += sizeof(struct igmphdr);
1416 if (skb->len < len)
1417 return -EINVAL;
1418
1419 /* IGMPv{1,2}? */
1420 if (skb->len != len) {
1421 /* or IGMPv3? */
1422 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1423 if (skb->len < len || !pskb_may_pull(skb, len))
1424 return -EINVAL;
1425 }
1426
1427 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1428 * all-systems destination addresses (224.0.0.1) for general queries
1429 */
1430 if (!igmp_hdr(skb)->group &&
1431 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1432 return -EINVAL;
1433
1434 return 0;
1435 }
1436
1437 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1438 {
1439 switch (igmp_hdr(skb)->type) {
1440 case IGMP_HOST_LEAVE_MESSAGE:
1441 case IGMP_HOST_MEMBERSHIP_REPORT:
1442 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1443 /* fall through */
1444 return 0;
1445 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1446 return ip_mc_check_igmp_reportv3(skb);
1447 case IGMP_HOST_MEMBERSHIP_QUERY:
1448 return ip_mc_check_igmp_query(skb);
1449 default:
1450 return -ENOMSG;
1451 }
1452 }
1453
1454 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1455 {
1456 return skb_checksum_simple_validate(skb);
1457 }
1458
1459 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1460
1461 {
1462 struct sk_buff *skb_chk;
1463 unsigned int transport_len;
1464 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1465 int ret = -EINVAL;
1466
1467 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1468
1469 skb_chk = skb_checksum_trimmed(skb, transport_len,
1470 ip_mc_validate_checksum);
1471 if (!skb_chk)
1472 goto err;
1473
1474 if (!pskb_may_pull(skb_chk, len))
1475 goto err;
1476
1477 ret = ip_mc_check_igmp_msg(skb_chk);
1478 if (ret)
1479 goto err;
1480
1481 if (skb_trimmed)
1482 *skb_trimmed = skb_chk;
1483 /* free now unneeded clone */
1484 else if (skb_chk != skb)
1485 kfree_skb(skb_chk);
1486
1487 ret = 0;
1488
1489 err:
1490 if (ret && skb_chk && skb_chk != skb)
1491 kfree_skb(skb_chk);
1492
1493 return ret;
1494 }
1495
1496 /**
1497 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1498 * @skb: the skb to validate
1499 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1500 *
1501 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1502 * skb transport header accordingly and returns zero.
1503 *
1504 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1505 * standard
1506 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1507 * -ENOMEM: A memory allocation failure happened.
1508 *
1509 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1510 * to NULL): After parsing an IGMP packet successfully it will point to
1511 * an skb which has its tail aligned to the IP packet end. This might
1512 * either be the originally provided skb or a trimmed, cloned version if
1513 * the skb frame had data beyond the IP packet. A cloned skb allows us
1514 * to leave the original skb and its full frame unchanged (which might be
1515 * desirable for layer 2 frame jugglers).
1516 *
1517 * Caller needs to set the skb network header and free any returned skb if it
1518 * differs from the provided skb.
1519 */
1520 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1521 {
1522 int ret = ip_mc_check_iphdr(skb);
1523
1524 if (ret < 0)
1525 return ret;
1526
1527 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1528 return -ENOMSG;
1529
1530 return __ip_mc_check_igmp(skb, skb_trimmed);
1531 }
1532 EXPORT_SYMBOL(ip_mc_check_igmp);
1533
1534 /*
1535 * Resend IGMP JOIN report; used by netdev notifier.
1536 */
1537 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1538 {
1539 #ifdef CONFIG_IP_MULTICAST
1540 struct ip_mc_list *im;
1541 int type;
1542 struct net *net = dev_net(in_dev->dev);
1543
1544 ASSERT_RTNL();
1545
1546 for_each_pmc_rtnl(in_dev, im) {
1547 if (im->multiaddr == IGMP_ALL_HOSTS)
1548 continue;
1549 if (ipv4_is_local_multicast(im->multiaddr) &&
1550 !net->ipv4.sysctl_igmp_llm_reports)
1551 continue;
1552
1553 /* a failover is happening and switches
1554 * must be notified immediately
1555 */
1556 if (IGMP_V1_SEEN(in_dev))
1557 type = IGMP_HOST_MEMBERSHIP_REPORT;
1558 else if (IGMP_V2_SEEN(in_dev))
1559 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1560 else
1561 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1562 igmp_send_report(in_dev, im, type);
1563 }
1564 #endif
1565 }
1566
1567 /*
1568 * A socket has left a multicast group on device dev
1569 */
1570
1571 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1572 {
1573 struct ip_mc_list *i;
1574 struct ip_mc_list __rcu **ip;
1575
1576 ASSERT_RTNL();
1577
1578 for (ip = &in_dev->mc_list;
1579 (i = rtnl_dereference(*ip)) != NULL;
1580 ip = &i->next_rcu) {
1581 if (i->multiaddr == addr) {
1582 if (--i->users == 0) {
1583 ip_mc_hash_remove(in_dev, i);
1584 *ip = i->next_rcu;
1585 in_dev->mc_count--;
1586 igmp_group_dropped(i);
1587 ip_mc_clear_src(i);
1588
1589 if (!in_dev->dead)
1590 ip_rt_multicast_event(in_dev);
1591
1592 ip_ma_put(i);
1593 return;
1594 }
1595 break;
1596 }
1597 }
1598 }
1599 EXPORT_SYMBOL(ip_mc_dec_group);
1600
1601 /* Device changing type */
1602
1603 void ip_mc_unmap(struct in_device *in_dev)
1604 {
1605 struct ip_mc_list *pmc;
1606
1607 ASSERT_RTNL();
1608
1609 for_each_pmc_rtnl(in_dev, pmc)
1610 igmp_group_dropped(pmc);
1611 }
1612
1613 void ip_mc_remap(struct in_device *in_dev)
1614 {
1615 struct ip_mc_list *pmc;
1616
1617 ASSERT_RTNL();
1618
1619 for_each_pmc_rtnl(in_dev, pmc)
1620 igmp_group_added(pmc);
1621 }
1622
1623 /* Device going down */
1624
1625 void ip_mc_down(struct in_device *in_dev)
1626 {
1627 struct ip_mc_list *pmc;
1628
1629 ASSERT_RTNL();
1630
1631 for_each_pmc_rtnl(in_dev, pmc)
1632 igmp_group_dropped(pmc);
1633
1634 #ifdef CONFIG_IP_MULTICAST
1635 in_dev->mr_ifc_count = 0;
1636 if (del_timer(&in_dev->mr_ifc_timer))
1637 __in_dev_put(in_dev);
1638 in_dev->mr_gq_running = 0;
1639 if (del_timer(&in_dev->mr_gq_timer))
1640 __in_dev_put(in_dev);
1641 igmpv3_clear_delrec(in_dev);
1642 #endif
1643
1644 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1645 }
1646
1647 void ip_mc_init_dev(struct in_device *in_dev)
1648 {
1649 #ifdef CONFIG_IP_MULTICAST
1650 struct net *net = dev_net(in_dev->dev);
1651 #endif
1652 ASSERT_RTNL();
1653
1654 #ifdef CONFIG_IP_MULTICAST
1655 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1656 (unsigned long)in_dev);
1657 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1658 (unsigned long)in_dev);
1659 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1660 #endif
1661
1662 spin_lock_init(&in_dev->mc_tomb_lock);
1663 }
1664
1665 /* Device going up */
1666
1667 void ip_mc_up(struct in_device *in_dev)
1668 {
1669 struct ip_mc_list *pmc;
1670 #ifdef CONFIG_IP_MULTICAST
1671 struct net *net = dev_net(in_dev->dev);
1672 #endif
1673
1674 ASSERT_RTNL();
1675
1676 #ifdef CONFIG_IP_MULTICAST
1677 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1678 #endif
1679 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1680
1681 for_each_pmc_rtnl(in_dev, pmc)
1682 igmp_group_added(pmc);
1683 }
1684
1685 /*
1686 * Device is about to be destroyed: clean up.
1687 */
1688
1689 void ip_mc_destroy_dev(struct in_device *in_dev)
1690 {
1691 struct ip_mc_list *i;
1692
1693 ASSERT_RTNL();
1694
1695 /* Deactivate timers */
1696 ip_mc_down(in_dev);
1697
1698 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1699 in_dev->mc_list = i->next_rcu;
1700 in_dev->mc_count--;
1701
1702 /* We've dropped the groups in ip_mc_down already */
1703 ip_mc_clear_src(i);
1704 ip_ma_put(i);
1705 }
1706 }
1707
1708 /* RTNL is locked */
1709 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1710 {
1711 struct net_device *dev = NULL;
1712 struct in_device *idev = NULL;
1713
1714 if (imr->imr_ifindex) {
1715 idev = inetdev_by_index(net, imr->imr_ifindex);
1716 return idev;
1717 }
1718 if (imr->imr_address.s_addr) {
1719 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1720 if (!dev)
1721 return NULL;
1722 }
1723
1724 if (!dev) {
1725 struct rtable *rt = ip_route_output(net,
1726 imr->imr_multiaddr.s_addr,
1727 0, 0, 0);
1728 if (!IS_ERR(rt)) {
1729 dev = rt->dst.dev;
1730 ip_rt_put(rt);
1731 }
1732 }
1733 if (dev) {
1734 imr->imr_ifindex = dev->ifindex;
1735 idev = __in_dev_get_rtnl(dev);
1736 }
1737 return idev;
1738 }
1739
1740 /*
1741 * Join a socket to a group
1742 */
1743
1744 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1745 __be32 *psfsrc)
1746 {
1747 struct ip_sf_list *psf, *psf_prev;
1748 int rv = 0;
1749
1750 psf_prev = NULL;
1751 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1752 if (psf->sf_inaddr == *psfsrc)
1753 break;
1754 psf_prev = psf;
1755 }
1756 if (!psf || psf->sf_count[sfmode] == 0) {
1757 /* source filter not found, or count wrong => bug */
1758 return -ESRCH;
1759 }
1760 psf->sf_count[sfmode]--;
1761 if (psf->sf_count[sfmode] == 0) {
1762 ip_rt_multicast_event(pmc->interface);
1763 }
1764 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1765 #ifdef CONFIG_IP_MULTICAST
1766 struct in_device *in_dev = pmc->interface;
1767 struct net *net = dev_net(in_dev->dev);
1768 #endif
1769
1770 /* no more filters for this source */
1771 if (psf_prev)
1772 psf_prev->sf_next = psf->sf_next;
1773 else
1774 pmc->sources = psf->sf_next;
1775 #ifdef CONFIG_IP_MULTICAST
1776 if (psf->sf_oldin &&
1777 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1778 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1779 psf->sf_next = pmc->tomb;
1780 pmc->tomb = psf;
1781 rv = 1;
1782 } else
1783 #endif
1784 kfree(psf);
1785 }
1786 return rv;
1787 }
1788
1789 #ifndef CONFIG_IP_MULTICAST
1790 #define igmp_ifc_event(x) do { } while (0)
1791 #endif
1792
1793 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1794 int sfcount, __be32 *psfsrc, int delta)
1795 {
1796 struct ip_mc_list *pmc;
1797 int changerec = 0;
1798 int i, err;
1799
1800 if (!in_dev)
1801 return -ENODEV;
1802 rcu_read_lock();
1803 for_each_pmc_rcu(in_dev, pmc) {
1804 if (*pmca == pmc->multiaddr)
1805 break;
1806 }
1807 if (!pmc) {
1808 /* MCA not found?? bug */
1809 rcu_read_unlock();
1810 return -ESRCH;
1811 }
1812 spin_lock_bh(&pmc->lock);
1813 rcu_read_unlock();
1814 #ifdef CONFIG_IP_MULTICAST
1815 sf_markstate(pmc);
1816 #endif
1817 if (!delta) {
1818 err = -EINVAL;
1819 if (!pmc->sfcount[sfmode])
1820 goto out_unlock;
1821 pmc->sfcount[sfmode]--;
1822 }
1823 err = 0;
1824 for (i = 0; i < sfcount; i++) {
1825 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1826
1827 changerec |= rv > 0;
1828 if (!err && rv < 0)
1829 err = rv;
1830 }
1831 if (pmc->sfmode == MCAST_EXCLUDE &&
1832 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1833 pmc->sfcount[MCAST_INCLUDE]) {
1834 #ifdef CONFIG_IP_MULTICAST
1835 struct ip_sf_list *psf;
1836 struct net *net = dev_net(in_dev->dev);
1837 #endif
1838
1839 /* filter mode change */
1840 pmc->sfmode = MCAST_INCLUDE;
1841 #ifdef CONFIG_IP_MULTICAST
1842 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1843 in_dev->mr_ifc_count = pmc->crcount;
1844 for (psf = pmc->sources; psf; psf = psf->sf_next)
1845 psf->sf_crcount = 0;
1846 igmp_ifc_event(pmc->interface);
1847 } else if (sf_setstate(pmc) || changerec) {
1848 igmp_ifc_event(pmc->interface);
1849 #endif
1850 }
1851 out_unlock:
1852 spin_unlock_bh(&pmc->lock);
1853 return err;
1854 }
1855
1856 /*
1857 * Add multicast single-source filter to the interface list
1858 */
1859 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1860 __be32 *psfsrc)
1861 {
1862 struct ip_sf_list *psf, *psf_prev;
1863
1864 psf_prev = NULL;
1865 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1866 if (psf->sf_inaddr == *psfsrc)
1867 break;
1868 psf_prev = psf;
1869 }
1870 if (!psf) {
1871 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1872 if (!psf)
1873 return -ENOBUFS;
1874 psf->sf_inaddr = *psfsrc;
1875 if (psf_prev) {
1876 psf_prev->sf_next = psf;
1877 } else
1878 pmc->sources = psf;
1879 }
1880 psf->sf_count[sfmode]++;
1881 if (psf->sf_count[sfmode] == 1) {
1882 ip_rt_multicast_event(pmc->interface);
1883 }
1884 return 0;
1885 }
1886
1887 #ifdef CONFIG_IP_MULTICAST
1888 static void sf_markstate(struct ip_mc_list *pmc)
1889 {
1890 struct ip_sf_list *psf;
1891 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1892
1893 for (psf = pmc->sources; psf; psf = psf->sf_next)
1894 if (pmc->sfcount[MCAST_EXCLUDE]) {
1895 psf->sf_oldin = mca_xcount ==
1896 psf->sf_count[MCAST_EXCLUDE] &&
1897 !psf->sf_count[MCAST_INCLUDE];
1898 } else
1899 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1900 }
1901
1902 static int sf_setstate(struct ip_mc_list *pmc)
1903 {
1904 struct ip_sf_list *psf, *dpsf;
1905 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1906 int qrv = pmc->interface->mr_qrv;
1907 int new_in, rv;
1908
1909 rv = 0;
1910 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1911 if (pmc->sfcount[MCAST_EXCLUDE]) {
1912 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1913 !psf->sf_count[MCAST_INCLUDE];
1914 } else
1915 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1916 if (new_in) {
1917 if (!psf->sf_oldin) {
1918 struct ip_sf_list *prev = NULL;
1919
1920 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1921 if (dpsf->sf_inaddr == psf->sf_inaddr)
1922 break;
1923 prev = dpsf;
1924 }
1925 if (dpsf) {
1926 if (prev)
1927 prev->sf_next = dpsf->sf_next;
1928 else
1929 pmc->tomb = dpsf->sf_next;
1930 kfree(dpsf);
1931 }
1932 psf->sf_crcount = qrv;
1933 rv++;
1934 }
1935 } else if (psf->sf_oldin) {
1936
1937 psf->sf_crcount = 0;
1938 /*
1939 * add or update "delete" records if an active filter
1940 * is now inactive
1941 */
1942 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1943 if (dpsf->sf_inaddr == psf->sf_inaddr)
1944 break;
1945 if (!dpsf) {
1946 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1947 if (!dpsf)
1948 continue;
1949 *dpsf = *psf;
1950 /* pmc->lock held by callers */
1951 dpsf->sf_next = pmc->tomb;
1952 pmc->tomb = dpsf;
1953 }
1954 dpsf->sf_crcount = qrv;
1955 rv++;
1956 }
1957 }
1958 return rv;
1959 }
1960 #endif
1961
1962 /*
1963 * Add multicast source filter list to the interface list
1964 */
1965 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1966 int sfcount, __be32 *psfsrc, int delta)
1967 {
1968 struct ip_mc_list *pmc;
1969 int isexclude;
1970 int i, err;
1971
1972 if (!in_dev)
1973 return -ENODEV;
1974 rcu_read_lock();
1975 for_each_pmc_rcu(in_dev, pmc) {
1976 if (*pmca == pmc->multiaddr)
1977 break;
1978 }
1979 if (!pmc) {
1980 /* MCA not found?? bug */
1981 rcu_read_unlock();
1982 return -ESRCH;
1983 }
1984 spin_lock_bh(&pmc->lock);
1985 rcu_read_unlock();
1986
1987 #ifdef CONFIG_IP_MULTICAST
1988 sf_markstate(pmc);
1989 #endif
1990 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1991 if (!delta)
1992 pmc->sfcount[sfmode]++;
1993 err = 0;
1994 for (i = 0; i < sfcount; i++) {
1995 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1996 if (err)
1997 break;
1998 }
1999 if (err) {
2000 int j;
2001
2002 if (!delta)
2003 pmc->sfcount[sfmode]--;
2004 for (j = 0; j < i; j++)
2005 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2006 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2007 #ifdef CONFIG_IP_MULTICAST
2008 struct ip_sf_list *psf;
2009 struct net *net = dev_net(pmc->interface->dev);
2010 in_dev = pmc->interface;
2011 #endif
2012
2013 /* filter mode change */
2014 if (pmc->sfcount[MCAST_EXCLUDE])
2015 pmc->sfmode = MCAST_EXCLUDE;
2016 else if (pmc->sfcount[MCAST_INCLUDE])
2017 pmc->sfmode = MCAST_INCLUDE;
2018 #ifdef CONFIG_IP_MULTICAST
2019 /* else no filters; keep old mode for reports */
2020
2021 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2022 in_dev->mr_ifc_count = pmc->crcount;
2023 for (psf = pmc->sources; psf; psf = psf->sf_next)
2024 psf->sf_crcount = 0;
2025 igmp_ifc_event(in_dev);
2026 } else if (sf_setstate(pmc)) {
2027 igmp_ifc_event(in_dev);
2028 #endif
2029 }
2030 spin_unlock_bh(&pmc->lock);
2031 return err;
2032 }
2033
2034 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2035 {
2036 struct ip_sf_list *psf, *nextpsf;
2037
2038 for (psf = pmc->tomb; psf; psf = nextpsf) {
2039 nextpsf = psf->sf_next;
2040 kfree(psf);
2041 }
2042 pmc->tomb = NULL;
2043 for (psf = pmc->sources; psf; psf = nextpsf) {
2044 nextpsf = psf->sf_next;
2045 kfree(psf);
2046 }
2047 pmc->sources = NULL;
2048 pmc->sfmode = MCAST_EXCLUDE;
2049 pmc->sfcount[MCAST_INCLUDE] = 0;
2050 pmc->sfcount[MCAST_EXCLUDE] = 1;
2051 }
2052
2053 /* Join a multicast group
2054 */
2055
2056 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2057 {
2058 __be32 addr = imr->imr_multiaddr.s_addr;
2059 struct ip_mc_socklist *iml, *i;
2060 struct in_device *in_dev;
2061 struct inet_sock *inet = inet_sk(sk);
2062 struct net *net = sock_net(sk);
2063 int ifindex;
2064 int count = 0;
2065 int err;
2066
2067 ASSERT_RTNL();
2068
2069 if (!ipv4_is_multicast(addr))
2070 return -EINVAL;
2071
2072 in_dev = ip_mc_find_dev(net, imr);
2073
2074 if (!in_dev) {
2075 err = -ENODEV;
2076 goto done;
2077 }
2078
2079 err = -EADDRINUSE;
2080 ifindex = imr->imr_ifindex;
2081 for_each_pmc_rtnl(inet, i) {
2082 if (i->multi.imr_multiaddr.s_addr == addr &&
2083 i->multi.imr_ifindex == ifindex)
2084 goto done;
2085 count++;
2086 }
2087 err = -ENOBUFS;
2088 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2089 goto done;
2090 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2091 if (!iml)
2092 goto done;
2093
2094 memcpy(&iml->multi, imr, sizeof(*imr));
2095 iml->next_rcu = inet->mc_list;
2096 iml->sflist = NULL;
2097 iml->sfmode = MCAST_EXCLUDE;
2098 rcu_assign_pointer(inet->mc_list, iml);
2099 ip_mc_inc_group(in_dev, addr);
2100 err = 0;
2101 done:
2102 return err;
2103 }
2104 EXPORT_SYMBOL(ip_mc_join_group);
2105
2106 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2107 struct in_device *in_dev)
2108 {
2109 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2110 int err;
2111
2112 if (!psf) {
2113 /* any-source empty exclude case */
2114 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2115 iml->sfmode, 0, NULL, 0);
2116 }
2117 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2118 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2119 RCU_INIT_POINTER(iml->sflist, NULL);
2120 /* decrease mem now to avoid the memleak warning */
2121 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2122 kfree_rcu(psf, rcu);
2123 return err;
2124 }
2125
2126 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2127 {
2128 struct inet_sock *inet = inet_sk(sk);
2129 struct ip_mc_socklist *iml;
2130 struct ip_mc_socklist __rcu **imlp;
2131 struct in_device *in_dev;
2132 struct net *net = sock_net(sk);
2133 __be32 group = imr->imr_multiaddr.s_addr;
2134 u32 ifindex;
2135 int ret = -EADDRNOTAVAIL;
2136
2137 ASSERT_RTNL();
2138
2139 in_dev = ip_mc_find_dev(net, imr);
2140 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2141 ret = -ENODEV;
2142 goto out;
2143 }
2144 ifindex = imr->imr_ifindex;
2145 for (imlp = &inet->mc_list;
2146 (iml = rtnl_dereference(*imlp)) != NULL;
2147 imlp = &iml->next_rcu) {
2148 if (iml->multi.imr_multiaddr.s_addr != group)
2149 continue;
2150 if (ifindex) {
2151 if (iml->multi.imr_ifindex != ifindex)
2152 continue;
2153 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2154 iml->multi.imr_address.s_addr)
2155 continue;
2156
2157 (void) ip_mc_leave_src(sk, iml, in_dev);
2158
2159 *imlp = iml->next_rcu;
2160
2161 if (in_dev)
2162 ip_mc_dec_group(in_dev, group);
2163
2164 /* decrease mem now to avoid the memleak warning */
2165 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2166 kfree_rcu(iml, rcu);
2167 return 0;
2168 }
2169 out:
2170 return ret;
2171 }
2172 EXPORT_SYMBOL(ip_mc_leave_group);
2173
2174 int ip_mc_source(int add, int omode, struct sock *sk, struct
2175 ip_mreq_source *mreqs, int ifindex)
2176 {
2177 int err;
2178 struct ip_mreqn imr;
2179 __be32 addr = mreqs->imr_multiaddr;
2180 struct ip_mc_socklist *pmc;
2181 struct in_device *in_dev = NULL;
2182 struct inet_sock *inet = inet_sk(sk);
2183 struct ip_sf_socklist *psl;
2184 struct net *net = sock_net(sk);
2185 int leavegroup = 0;
2186 int i, j, rv;
2187
2188 if (!ipv4_is_multicast(addr))
2189 return -EINVAL;
2190
2191 ASSERT_RTNL();
2192
2193 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2194 imr.imr_address.s_addr = mreqs->imr_interface;
2195 imr.imr_ifindex = ifindex;
2196 in_dev = ip_mc_find_dev(net, &imr);
2197
2198 if (!in_dev) {
2199 err = -ENODEV;
2200 goto done;
2201 }
2202 err = -EADDRNOTAVAIL;
2203
2204 for_each_pmc_rtnl(inet, pmc) {
2205 if ((pmc->multi.imr_multiaddr.s_addr ==
2206 imr.imr_multiaddr.s_addr) &&
2207 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2208 break;
2209 }
2210 if (!pmc) { /* must have a prior join */
2211 err = -EINVAL;
2212 goto done;
2213 }
2214 /* if a source filter was set, must be the same mode as before */
2215 if (pmc->sflist) {
2216 if (pmc->sfmode != omode) {
2217 err = -EINVAL;
2218 goto done;
2219 }
2220 } else if (pmc->sfmode != omode) {
2221 /* allow mode switches for empty-set filters */
2222 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2223 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2224 NULL, 0);
2225 pmc->sfmode = omode;
2226 }
2227
2228 psl = rtnl_dereference(pmc->sflist);
2229 if (!add) {
2230 if (!psl)
2231 goto done; /* err = -EADDRNOTAVAIL */
2232 rv = !0;
2233 for (i = 0; i < psl->sl_count; i++) {
2234 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2235 sizeof(__be32));
2236 if (rv == 0)
2237 break;
2238 }
2239 if (rv) /* source not found */
2240 goto done; /* err = -EADDRNOTAVAIL */
2241
2242 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2243 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2244 leavegroup = 1;
2245 goto done;
2246 }
2247
2248 /* update the interface filter */
2249 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2250 &mreqs->imr_sourceaddr, 1);
2251
2252 for (j = i+1; j < psl->sl_count; j++)
2253 psl->sl_addr[j-1] = psl->sl_addr[j];
2254 psl->sl_count--;
2255 err = 0;
2256 goto done;
2257 }
2258 /* else, add a new source to the filter */
2259
2260 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2261 err = -ENOBUFS;
2262 goto done;
2263 }
2264 if (!psl || psl->sl_count == psl->sl_max) {
2265 struct ip_sf_socklist *newpsl;
2266 int count = IP_SFBLOCK;
2267
2268 if (psl)
2269 count += psl->sl_max;
2270 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2271 if (!newpsl) {
2272 err = -ENOBUFS;
2273 goto done;
2274 }
2275 newpsl->sl_max = count;
2276 newpsl->sl_count = count - IP_SFBLOCK;
2277 if (psl) {
2278 for (i = 0; i < psl->sl_count; i++)
2279 newpsl->sl_addr[i] = psl->sl_addr[i];
2280 /* decrease mem now to avoid the memleak warning */
2281 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2282 kfree_rcu(psl, rcu);
2283 }
2284 rcu_assign_pointer(pmc->sflist, newpsl);
2285 psl = newpsl;
2286 }
2287 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2288 for (i = 0; i < psl->sl_count; i++) {
2289 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2290 sizeof(__be32));
2291 if (rv == 0)
2292 break;
2293 }
2294 if (rv == 0) /* address already there is an error */
2295 goto done;
2296 for (j = psl->sl_count-1; j >= i; j--)
2297 psl->sl_addr[j+1] = psl->sl_addr[j];
2298 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2299 psl->sl_count++;
2300 err = 0;
2301 /* update the interface list */
2302 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2303 &mreqs->imr_sourceaddr, 1);
2304 done:
2305 if (leavegroup)
2306 err = ip_mc_leave_group(sk, &imr);
2307 return err;
2308 }
2309
2310 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2311 {
2312 int err = 0;
2313 struct ip_mreqn imr;
2314 __be32 addr = msf->imsf_multiaddr;
2315 struct ip_mc_socklist *pmc;
2316 struct in_device *in_dev;
2317 struct inet_sock *inet = inet_sk(sk);
2318 struct ip_sf_socklist *newpsl, *psl;
2319 struct net *net = sock_net(sk);
2320 int leavegroup = 0;
2321
2322 if (!ipv4_is_multicast(addr))
2323 return -EINVAL;
2324 if (msf->imsf_fmode != MCAST_INCLUDE &&
2325 msf->imsf_fmode != MCAST_EXCLUDE)
2326 return -EINVAL;
2327
2328 ASSERT_RTNL();
2329
2330 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2331 imr.imr_address.s_addr = msf->imsf_interface;
2332 imr.imr_ifindex = ifindex;
2333 in_dev = ip_mc_find_dev(net, &imr);
2334
2335 if (!in_dev) {
2336 err = -ENODEV;
2337 goto done;
2338 }
2339
2340 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2341 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2342 leavegroup = 1;
2343 goto done;
2344 }
2345
2346 for_each_pmc_rtnl(inet, pmc) {
2347 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2348 pmc->multi.imr_ifindex == imr.imr_ifindex)
2349 break;
2350 }
2351 if (!pmc) { /* must have a prior join */
2352 err = -EINVAL;
2353 goto done;
2354 }
2355 if (msf->imsf_numsrc) {
2356 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2357 GFP_KERNEL);
2358 if (!newpsl) {
2359 err = -ENOBUFS;
2360 goto done;
2361 }
2362 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2363 memcpy(newpsl->sl_addr, msf->imsf_slist,
2364 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2365 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2366 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2367 if (err) {
2368 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2369 goto done;
2370 }
2371 } else {
2372 newpsl = NULL;
2373 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2374 msf->imsf_fmode, 0, NULL, 0);
2375 }
2376 psl = rtnl_dereference(pmc->sflist);
2377 if (psl) {
2378 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2379 psl->sl_count, psl->sl_addr, 0);
2380 /* decrease mem now to avoid the memleak warning */
2381 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2382 kfree_rcu(psl, rcu);
2383 } else
2384 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2385 0, NULL, 0);
2386 rcu_assign_pointer(pmc->sflist, newpsl);
2387 pmc->sfmode = msf->imsf_fmode;
2388 err = 0;
2389 done:
2390 if (leavegroup)
2391 err = ip_mc_leave_group(sk, &imr);
2392 return err;
2393 }
2394
2395 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2396 struct ip_msfilter __user *optval, int __user *optlen)
2397 {
2398 int err, len, count, copycount;
2399 struct ip_mreqn imr;
2400 __be32 addr = msf->imsf_multiaddr;
2401 struct ip_mc_socklist *pmc;
2402 struct in_device *in_dev;
2403 struct inet_sock *inet = inet_sk(sk);
2404 struct ip_sf_socklist *psl;
2405 struct net *net = sock_net(sk);
2406
2407 ASSERT_RTNL();
2408
2409 if (!ipv4_is_multicast(addr))
2410 return -EINVAL;
2411
2412 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2413 imr.imr_address.s_addr = msf->imsf_interface;
2414 imr.imr_ifindex = 0;
2415 in_dev = ip_mc_find_dev(net, &imr);
2416
2417 if (!in_dev) {
2418 err = -ENODEV;
2419 goto done;
2420 }
2421 err = -EADDRNOTAVAIL;
2422
2423 for_each_pmc_rtnl(inet, pmc) {
2424 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2425 pmc->multi.imr_ifindex == imr.imr_ifindex)
2426 break;
2427 }
2428 if (!pmc) /* must have a prior join */
2429 goto done;
2430 msf->imsf_fmode = pmc->sfmode;
2431 psl = rtnl_dereference(pmc->sflist);
2432 if (!psl) {
2433 len = 0;
2434 count = 0;
2435 } else {
2436 count = psl->sl_count;
2437 }
2438 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2439 len = copycount * sizeof(psl->sl_addr[0]);
2440 msf->imsf_numsrc = count;
2441 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2442 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2443 return -EFAULT;
2444 }
2445 if (len &&
2446 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2447 return -EFAULT;
2448 return 0;
2449 done:
2450 return err;
2451 }
2452
2453 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2454 struct group_filter __user *optval, int __user *optlen)
2455 {
2456 int err, i, count, copycount;
2457 struct sockaddr_in *psin;
2458 __be32 addr;
2459 struct ip_mc_socklist *pmc;
2460 struct inet_sock *inet = inet_sk(sk);
2461 struct ip_sf_socklist *psl;
2462
2463 ASSERT_RTNL();
2464
2465 psin = (struct sockaddr_in *)&gsf->gf_group;
2466 if (psin->sin_family != AF_INET)
2467 return -EINVAL;
2468 addr = psin->sin_addr.s_addr;
2469 if (!ipv4_is_multicast(addr))
2470 return -EINVAL;
2471
2472 err = -EADDRNOTAVAIL;
2473
2474 for_each_pmc_rtnl(inet, pmc) {
2475 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2476 pmc->multi.imr_ifindex == gsf->gf_interface)
2477 break;
2478 }
2479 if (!pmc) /* must have a prior join */
2480 goto done;
2481 gsf->gf_fmode = pmc->sfmode;
2482 psl = rtnl_dereference(pmc->sflist);
2483 count = psl ? psl->sl_count : 0;
2484 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2485 gsf->gf_numsrc = count;
2486 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2487 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2488 return -EFAULT;
2489 }
2490 for (i = 0; i < copycount; i++) {
2491 struct sockaddr_storage ss;
2492
2493 psin = (struct sockaddr_in *)&ss;
2494 memset(&ss, 0, sizeof(ss));
2495 psin->sin_family = AF_INET;
2496 psin->sin_addr.s_addr = psl->sl_addr[i];
2497 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2498 return -EFAULT;
2499 }
2500 return 0;
2501 done:
2502 return err;
2503 }
2504
2505 /*
2506 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2507 */
2508 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2509 {
2510 struct inet_sock *inet = inet_sk(sk);
2511 struct ip_mc_socklist *pmc;
2512 struct ip_sf_socklist *psl;
2513 int i;
2514 int ret;
2515
2516 ret = 1;
2517 if (!ipv4_is_multicast(loc_addr))
2518 goto out;
2519
2520 rcu_read_lock();
2521 for_each_pmc_rcu(inet, pmc) {
2522 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2523 pmc->multi.imr_ifindex == dif)
2524 break;
2525 }
2526 ret = inet->mc_all;
2527 if (!pmc)
2528 goto unlock;
2529 psl = rcu_dereference(pmc->sflist);
2530 ret = (pmc->sfmode == MCAST_EXCLUDE);
2531 if (!psl)
2532 goto unlock;
2533
2534 for (i = 0; i < psl->sl_count; i++) {
2535 if (psl->sl_addr[i] == rmt_addr)
2536 break;
2537 }
2538 ret = 0;
2539 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2540 goto unlock;
2541 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2542 goto unlock;
2543 ret = 1;
2544 unlock:
2545 rcu_read_unlock();
2546 out:
2547 return ret;
2548 }
2549
2550 /*
2551 * A socket is closing.
2552 */
2553
2554 void ip_mc_drop_socket(struct sock *sk)
2555 {
2556 struct inet_sock *inet = inet_sk(sk);
2557 struct ip_mc_socklist *iml;
2558 struct net *net = sock_net(sk);
2559
2560 if (!inet->mc_list)
2561 return;
2562
2563 rtnl_lock();
2564 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2565 struct in_device *in_dev;
2566
2567 inet->mc_list = iml->next_rcu;
2568 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2569 (void) ip_mc_leave_src(sk, iml, in_dev);
2570 if (in_dev)
2571 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2572 /* decrease mem now to avoid the memleak warning */
2573 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2574 kfree_rcu(iml, rcu);
2575 }
2576 rtnl_unlock();
2577 }
2578
2579 /* called with rcu_read_lock() */
2580 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2581 {
2582 struct ip_mc_list *im;
2583 struct ip_mc_list __rcu **mc_hash;
2584 struct ip_sf_list *psf;
2585 int rv = 0;
2586
2587 mc_hash = rcu_dereference(in_dev->mc_hash);
2588 if (mc_hash) {
2589 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2590
2591 for (im = rcu_dereference(mc_hash[hash]);
2592 im != NULL;
2593 im = rcu_dereference(im->next_hash)) {
2594 if (im->multiaddr == mc_addr)
2595 break;
2596 }
2597 } else {
2598 for_each_pmc_rcu(in_dev, im) {
2599 if (im->multiaddr == mc_addr)
2600 break;
2601 }
2602 }
2603 if (im && proto == IPPROTO_IGMP) {
2604 rv = 1;
2605 } else if (im) {
2606 if (src_addr) {
2607 for (psf = im->sources; psf; psf = psf->sf_next) {
2608 if (psf->sf_inaddr == src_addr)
2609 break;
2610 }
2611 if (psf)
2612 rv = psf->sf_count[MCAST_INCLUDE] ||
2613 psf->sf_count[MCAST_EXCLUDE] !=
2614 im->sfcount[MCAST_EXCLUDE];
2615 else
2616 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2617 } else
2618 rv = 1; /* unspecified source; tentatively allow */
2619 }
2620 return rv;
2621 }
2622
2623 #if defined(CONFIG_PROC_FS)
2624 struct igmp_mc_iter_state {
2625 struct seq_net_private p;
2626 struct net_device *dev;
2627 struct in_device *in_dev;
2628 };
2629
2630 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2631
2632 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2633 {
2634 struct net *net = seq_file_net(seq);
2635 struct ip_mc_list *im = NULL;
2636 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2637
2638 state->in_dev = NULL;
2639 for_each_netdev_rcu(net, state->dev) {
2640 struct in_device *in_dev;
2641
2642 in_dev = __in_dev_get_rcu(state->dev);
2643 if (!in_dev)
2644 continue;
2645 im = rcu_dereference(in_dev->mc_list);
2646 if (im) {
2647 state->in_dev = in_dev;
2648 break;
2649 }
2650 }
2651 return im;
2652 }
2653
2654 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2655 {
2656 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2657
2658 im = rcu_dereference(im->next_rcu);
2659 while (!im) {
2660 state->dev = next_net_device_rcu(state->dev);
2661 if (!state->dev) {
2662 state->in_dev = NULL;
2663 break;
2664 }
2665 state->in_dev = __in_dev_get_rcu(state->dev);
2666 if (!state->in_dev)
2667 continue;
2668 im = rcu_dereference(state->in_dev->mc_list);
2669 }
2670 return im;
2671 }
2672
2673 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2674 {
2675 struct ip_mc_list *im = igmp_mc_get_first(seq);
2676 if (im)
2677 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2678 --pos;
2679 return pos ? NULL : im;
2680 }
2681
2682 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2683 __acquires(rcu)
2684 {
2685 rcu_read_lock();
2686 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2687 }
2688
2689 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2690 {
2691 struct ip_mc_list *im;
2692 if (v == SEQ_START_TOKEN)
2693 im = igmp_mc_get_first(seq);
2694 else
2695 im = igmp_mc_get_next(seq, v);
2696 ++*pos;
2697 return im;
2698 }
2699
2700 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2701 __releases(rcu)
2702 {
2703 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2704
2705 state->in_dev = NULL;
2706 state->dev = NULL;
2707 rcu_read_unlock();
2708 }
2709
2710 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2711 {
2712 if (v == SEQ_START_TOKEN)
2713 seq_puts(seq,
2714 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2715 else {
2716 struct ip_mc_list *im = (struct ip_mc_list *)v;
2717 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2718 char *querier;
2719 long delta;
2720
2721 #ifdef CONFIG_IP_MULTICAST
2722 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2723 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2724 "V3";
2725 #else
2726 querier = "NONE";
2727 #endif
2728
2729 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2730 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2731 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2732 }
2733
2734 delta = im->timer.expires - jiffies;
2735 seq_printf(seq,
2736 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2737 im->multiaddr, im->users,
2738 im->tm_running,
2739 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2740 im->reporter);
2741 }
2742 return 0;
2743 }
2744
2745 static const struct seq_operations igmp_mc_seq_ops = {
2746 .start = igmp_mc_seq_start,
2747 .next = igmp_mc_seq_next,
2748 .stop = igmp_mc_seq_stop,
2749 .show = igmp_mc_seq_show,
2750 };
2751
2752 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2753 {
2754 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2755 sizeof(struct igmp_mc_iter_state));
2756 }
2757
2758 static const struct file_operations igmp_mc_seq_fops = {
2759 .owner = THIS_MODULE,
2760 .open = igmp_mc_seq_open,
2761 .read = seq_read,
2762 .llseek = seq_lseek,
2763 .release = seq_release_net,
2764 };
2765
2766 struct igmp_mcf_iter_state {
2767 struct seq_net_private p;
2768 struct net_device *dev;
2769 struct in_device *idev;
2770 struct ip_mc_list *im;
2771 };
2772
2773 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2774
2775 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2776 {
2777 struct net *net = seq_file_net(seq);
2778 struct ip_sf_list *psf = NULL;
2779 struct ip_mc_list *im = NULL;
2780 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2781
2782 state->idev = NULL;
2783 state->im = NULL;
2784 for_each_netdev_rcu(net, state->dev) {
2785 struct in_device *idev;
2786 idev = __in_dev_get_rcu(state->dev);
2787 if (unlikely(!idev))
2788 continue;
2789 im = rcu_dereference(idev->mc_list);
2790 if (likely(im)) {
2791 spin_lock_bh(&im->lock);
2792 psf = im->sources;
2793 if (likely(psf)) {
2794 state->im = im;
2795 state->idev = idev;
2796 break;
2797 }
2798 spin_unlock_bh(&im->lock);
2799 }
2800 }
2801 return psf;
2802 }
2803
2804 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2805 {
2806 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2807
2808 psf = psf->sf_next;
2809 while (!psf) {
2810 spin_unlock_bh(&state->im->lock);
2811 state->im = state->im->next;
2812 while (!state->im) {
2813 state->dev = next_net_device_rcu(state->dev);
2814 if (!state->dev) {
2815 state->idev = NULL;
2816 goto out;
2817 }
2818 state->idev = __in_dev_get_rcu(state->dev);
2819 if (!state->idev)
2820 continue;
2821 state->im = rcu_dereference(state->idev->mc_list);
2822 }
2823 if (!state->im)
2824 break;
2825 spin_lock_bh(&state->im->lock);
2826 psf = state->im->sources;
2827 }
2828 out:
2829 return psf;
2830 }
2831
2832 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2833 {
2834 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2835 if (psf)
2836 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2837 --pos;
2838 return pos ? NULL : psf;
2839 }
2840
2841 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2842 __acquires(rcu)
2843 {
2844 rcu_read_lock();
2845 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2846 }
2847
2848 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2849 {
2850 struct ip_sf_list *psf;
2851 if (v == SEQ_START_TOKEN)
2852 psf = igmp_mcf_get_first(seq);
2853 else
2854 psf = igmp_mcf_get_next(seq, v);
2855 ++*pos;
2856 return psf;
2857 }
2858
2859 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2860 __releases(rcu)
2861 {
2862 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2863 if (likely(state->im)) {
2864 spin_unlock_bh(&state->im->lock);
2865 state->im = NULL;
2866 }
2867 state->idev = NULL;
2868 state->dev = NULL;
2869 rcu_read_unlock();
2870 }
2871
2872 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2873 {
2874 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2875 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2876
2877 if (v == SEQ_START_TOKEN) {
2878 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2879 } else {
2880 seq_printf(seq,
2881 "%3d %6.6s 0x%08x "
2882 "0x%08x %6lu %6lu\n",
2883 state->dev->ifindex, state->dev->name,
2884 ntohl(state->im->multiaddr),
2885 ntohl(psf->sf_inaddr),
2886 psf->sf_count[MCAST_INCLUDE],
2887 psf->sf_count[MCAST_EXCLUDE]);
2888 }
2889 return 0;
2890 }
2891
2892 static const struct seq_operations igmp_mcf_seq_ops = {
2893 .start = igmp_mcf_seq_start,
2894 .next = igmp_mcf_seq_next,
2895 .stop = igmp_mcf_seq_stop,
2896 .show = igmp_mcf_seq_show,
2897 };
2898
2899 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2900 {
2901 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2902 sizeof(struct igmp_mcf_iter_state));
2903 }
2904
2905 static const struct file_operations igmp_mcf_seq_fops = {
2906 .owner = THIS_MODULE,
2907 .open = igmp_mcf_seq_open,
2908 .read = seq_read,
2909 .llseek = seq_lseek,
2910 .release = seq_release_net,
2911 };
2912
2913 static int __net_init igmp_net_init(struct net *net)
2914 {
2915 struct proc_dir_entry *pde;
2916 int err;
2917
2918 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2919 if (!pde)
2920 goto out_igmp;
2921 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2922 &igmp_mcf_seq_fops);
2923 if (!pde)
2924 goto out_mcfilter;
2925 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2926 SOCK_DGRAM, 0, net);
2927 if (err < 0) {
2928 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2929 err);
2930 goto out_sock;
2931 }
2932
2933 /* Sysctl initialization */
2934 net->ipv4.sysctl_igmp_max_memberships = 20;
2935 net->ipv4.sysctl_igmp_max_msf = 10;
2936 /* IGMP reports for link-local multicast groups are enabled by default */
2937 net->ipv4.sysctl_igmp_llm_reports = 1;
2938 net->ipv4.sysctl_igmp_qrv = 2;
2939 return 0;
2940
2941 out_sock:
2942 remove_proc_entry("mcfilter", net->proc_net);
2943 out_mcfilter:
2944 remove_proc_entry("igmp", net->proc_net);
2945 out_igmp:
2946 return -ENOMEM;
2947 }
2948
2949 static void __net_exit igmp_net_exit(struct net *net)
2950 {
2951 remove_proc_entry("mcfilter", net->proc_net);
2952 remove_proc_entry("igmp", net->proc_net);
2953 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2954 }
2955
2956 static struct pernet_operations igmp_net_ops = {
2957 .init = igmp_net_init,
2958 .exit = igmp_net_exit,
2959 };
2960 #endif
2961
2962 static int igmp_netdev_event(struct notifier_block *this,
2963 unsigned long event, void *ptr)
2964 {
2965 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2966 struct in_device *in_dev;
2967
2968 switch (event) {
2969 case NETDEV_RESEND_IGMP:
2970 in_dev = __in_dev_get_rtnl(dev);
2971 if (in_dev)
2972 ip_mc_rejoin_groups(in_dev);
2973 break;
2974 default:
2975 break;
2976 }
2977 return NOTIFY_DONE;
2978 }
2979
2980 static struct notifier_block igmp_notifier = {
2981 .notifier_call = igmp_netdev_event,
2982 };
2983
2984 int __init igmp_mc_init(void)
2985 {
2986 #if defined(CONFIG_PROC_FS)
2987 int err;
2988
2989 err = register_pernet_subsys(&igmp_net_ops);
2990 if (err)
2991 return err;
2992 err = register_netdevice_notifier(&igmp_notifier);
2993 if (err)
2994 goto reg_notif_fail;
2995 return 0;
2996
2997 reg_notif_fail:
2998 unregister_pernet_subsys(&igmp_net_ops);
2999 return err;
3000 #else
3001 return register_netdevice_notifier(&igmp_notifier);
3002 #endif
3003 }
Linux kernel - Deliverables
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