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[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 #define IP_MAX_MEMBERSHIPS 20
111 #define IP_MAX_MSF 10
112
113 /* IGMP reports for link-local multicast groups are enabled by default */
114 int sysctl_igmp_llm_reports __read_mostly = 1;
115
116 #ifdef CONFIG_IP_MULTICAST
117 /* Parameter names and values are taken from igmp-v2-06 draft */
118
119 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
120 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
121 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
122 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
123 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
124 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
125
126
127 #define IGMP_INITIAL_REPORT_DELAY (1)
128
129 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
130 * IGMP specs require to report membership immediately after
131 * joining a group, but we delay the first report by a
132 * small interval. It seems more natural and still does not
133 * contradict to specs provided this delay is small enough.
134 */
135
136 #define IGMP_V1_SEEN(in_dev) \
137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
139 ((in_dev)->mr_v1_seen && \
140 time_before(jiffies, (in_dev)->mr_v1_seen)))
141 #define IGMP_V2_SEEN(in_dev) \
142 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
143 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
144 ((in_dev)->mr_v2_seen && \
145 time_before(jiffies, (in_dev)->mr_v2_seen)))
146
147 static int unsolicited_report_interval(struct in_device *in_dev)
148 {
149 int interval_ms, interval_jiffies;
150
151 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
152 interval_ms = IN_DEV_CONF_GET(
153 in_dev,
154 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
155 else /* v3 */
156 interval_ms = IN_DEV_CONF_GET(
157 in_dev,
158 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
159
160 interval_jiffies = msecs_to_jiffies(interval_ms);
161
162 /* _timer functions can't handle a delay of 0 jiffies so ensure
163 * we always return a positive value.
164 */
165 if (interval_jiffies <= 0)
166 interval_jiffies = 1;
167 return interval_jiffies;
168 }
169
170 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
171 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
172 static void igmpv3_clear_delrec(struct in_device *in_dev);
173 static int sf_setstate(struct ip_mc_list *pmc);
174 static void sf_markstate(struct ip_mc_list *pmc);
175 #endif
176 static void ip_mc_clear_src(struct ip_mc_list *pmc);
177 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
178 int sfcount, __be32 *psfsrc, int delta);
179
180 static void ip_ma_put(struct ip_mc_list *im)
181 {
182 if (atomic_dec_and_test(&im->refcnt)) {
183 in_dev_put(im->interface);
184 kfree_rcu(im, rcu);
185 }
186 }
187
188 #define for_each_pmc_rcu(in_dev, pmc) \
189 for (pmc = rcu_dereference(in_dev->mc_list); \
190 pmc != NULL; \
191 pmc = rcu_dereference(pmc->next_rcu))
192
193 #define for_each_pmc_rtnl(in_dev, pmc) \
194 for (pmc = rtnl_dereference(in_dev->mc_list); \
195 pmc != NULL; \
196 pmc = rtnl_dereference(pmc->next_rcu))
197
198 #ifdef CONFIG_IP_MULTICAST
199
200 /*
201 * Timer management
202 */
203
204 static void igmp_stop_timer(struct ip_mc_list *im)
205 {
206 spin_lock_bh(&im->lock);
207 if (del_timer(&im->timer))
208 atomic_dec(&im->refcnt);
209 im->tm_running = 0;
210 im->reporter = 0;
211 im->unsolicit_count = 0;
212 spin_unlock_bh(&im->lock);
213 }
214
215 /* It must be called with locked im->lock */
216 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
217 {
218 int tv = prandom_u32() % max_delay;
219
220 im->tm_running = 1;
221 if (!mod_timer(&im->timer, jiffies+tv+2))
222 atomic_inc(&im->refcnt);
223 }
224
225 static void igmp_gq_start_timer(struct in_device *in_dev)
226 {
227 int tv = prandom_u32() % in_dev->mr_maxdelay;
228
229 in_dev->mr_gq_running = 1;
230 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
231 in_dev_hold(in_dev);
232 }
233
234 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
235 {
236 int tv = prandom_u32() % delay;
237
238 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
239 in_dev_hold(in_dev);
240 }
241
242 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
243 {
244 spin_lock_bh(&im->lock);
245 im->unsolicit_count = 0;
246 if (del_timer(&im->timer)) {
247 if ((long)(im->timer.expires-jiffies) < max_delay) {
248 add_timer(&im->timer);
249 im->tm_running = 1;
250 spin_unlock_bh(&im->lock);
251 return;
252 }
253 atomic_dec(&im->refcnt);
254 }
255 igmp_start_timer(im, max_delay);
256 spin_unlock_bh(&im->lock);
257 }
258
259
260 /*
261 * Send an IGMP report.
262 */
263
264 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
265
266
267 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
268 int gdeleted, int sdeleted)
269 {
270 switch (type) {
271 case IGMPV3_MODE_IS_INCLUDE:
272 case IGMPV3_MODE_IS_EXCLUDE:
273 if (gdeleted || sdeleted)
274 return 0;
275 if (!(pmc->gsquery && !psf->sf_gsresp)) {
276 if (pmc->sfmode == MCAST_INCLUDE)
277 return 1;
278 /* don't include if this source is excluded
279 * in all filters
280 */
281 if (psf->sf_count[MCAST_INCLUDE])
282 return type == IGMPV3_MODE_IS_INCLUDE;
283 return pmc->sfcount[MCAST_EXCLUDE] ==
284 psf->sf_count[MCAST_EXCLUDE];
285 }
286 return 0;
287 case IGMPV3_CHANGE_TO_INCLUDE:
288 if (gdeleted || sdeleted)
289 return 0;
290 return psf->sf_count[MCAST_INCLUDE] != 0;
291 case IGMPV3_CHANGE_TO_EXCLUDE:
292 if (gdeleted || sdeleted)
293 return 0;
294 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
295 psf->sf_count[MCAST_INCLUDE])
296 return 0;
297 return pmc->sfcount[MCAST_EXCLUDE] ==
298 psf->sf_count[MCAST_EXCLUDE];
299 case IGMPV3_ALLOW_NEW_SOURCES:
300 if (gdeleted || !psf->sf_crcount)
301 return 0;
302 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
303 case IGMPV3_BLOCK_OLD_SOURCES:
304 if (pmc->sfmode == MCAST_INCLUDE)
305 return gdeleted || (psf->sf_crcount && sdeleted);
306 return psf->sf_crcount && !gdeleted && !sdeleted;
307 }
308 return 0;
309 }
310
311 static int
312 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
313 {
314 struct ip_sf_list *psf;
315 int scount = 0;
316
317 for (psf = pmc->sources; psf; psf = psf->sf_next) {
318 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
319 continue;
320 scount++;
321 }
322 return scount;
323 }
324
325 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
326 {
327 struct sk_buff *skb;
328 struct rtable *rt;
329 struct iphdr *pip;
330 struct igmpv3_report *pig;
331 struct net *net = dev_net(dev);
332 struct flowi4 fl4;
333 int hlen = LL_RESERVED_SPACE(dev);
334 int tlen = dev->needed_tailroom;
335 unsigned int size = mtu;
336
337 while (1) {
338 skb = alloc_skb(size + hlen + tlen,
339 GFP_ATOMIC | __GFP_NOWARN);
340 if (skb)
341 break;
342 size >>= 1;
343 if (size < 256)
344 return NULL;
345 }
346 skb->priority = TC_PRIO_CONTROL;
347
348 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
349 0, 0,
350 IPPROTO_IGMP, 0, dev->ifindex);
351 if (IS_ERR(rt)) {
352 kfree_skb(skb);
353 return NULL;
354 }
355
356 skb_dst_set(skb, &rt->dst);
357 skb->dev = dev;
358
359 skb_reserve(skb, hlen);
360 skb_tailroom_reserve(skb, mtu, tlen);
361
362 skb_reset_network_header(skb);
363 pip = ip_hdr(skb);
364 skb_put(skb, sizeof(struct iphdr) + 4);
365
366 pip->version = 4;
367 pip->ihl = (sizeof(struct iphdr)+4)>>2;
368 pip->tos = 0xc0;
369 pip->frag_off = htons(IP_DF);
370 pip->ttl = 1;
371 pip->daddr = fl4.daddr;
372 pip->saddr = fl4.saddr;
373 pip->protocol = IPPROTO_IGMP;
374 pip->tot_len = 0; /* filled in later */
375 ip_select_ident(net, skb, NULL);
376 ((u8 *)&pip[1])[0] = IPOPT_RA;
377 ((u8 *)&pip[1])[1] = 4;
378 ((u8 *)&pip[1])[2] = 0;
379 ((u8 *)&pip[1])[3] = 0;
380
381 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
382 skb_put(skb, sizeof(*pig));
383 pig = igmpv3_report_hdr(skb);
384 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
385 pig->resv1 = 0;
386 pig->csum = 0;
387 pig->resv2 = 0;
388 pig->ngrec = 0;
389 return skb;
390 }
391
392 static int igmpv3_sendpack(struct sk_buff *skb)
393 {
394 struct igmphdr *pig = igmp_hdr(skb);
395 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
396
397 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
398
399 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
400 }
401
402 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
403 {
404 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
405 }
406
407 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
408 int type, struct igmpv3_grec **ppgr)
409 {
410 struct net_device *dev = pmc->interface->dev;
411 struct igmpv3_report *pih;
412 struct igmpv3_grec *pgr;
413
414 if (!skb)
415 skb = igmpv3_newpack(dev, dev->mtu);
416 if (!skb)
417 return NULL;
418 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
419 pgr->grec_type = type;
420 pgr->grec_auxwords = 0;
421 pgr->grec_nsrcs = 0;
422 pgr->grec_mca = pmc->multiaddr;
423 pih = igmpv3_report_hdr(skb);
424 pih->ngrec = htons(ntohs(pih->ngrec)+1);
425 *ppgr = pgr;
426 return skb;
427 }
428
429 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
430
431 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
432 int type, int gdeleted, int sdeleted)
433 {
434 struct net_device *dev = pmc->interface->dev;
435 struct igmpv3_report *pih;
436 struct igmpv3_grec *pgr = NULL;
437 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
438 int scount, stotal, first, isquery, truncate;
439
440 if (pmc->multiaddr == IGMP_ALL_HOSTS)
441 return skb;
442 if (ipv4_is_local_multicast(pmc->multiaddr) && !sysctl_igmp_llm_reports)
443 return skb;
444
445 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
446 type == IGMPV3_MODE_IS_EXCLUDE;
447 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
448 type == IGMPV3_CHANGE_TO_EXCLUDE;
449
450 stotal = scount = 0;
451
452 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
453
454 if (!*psf_list)
455 goto empty_source;
456
457 pih = skb ? igmpv3_report_hdr(skb) : NULL;
458
459 /* EX and TO_EX get a fresh packet, if needed */
460 if (truncate) {
461 if (pih && pih->ngrec &&
462 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
463 if (skb)
464 igmpv3_sendpack(skb);
465 skb = igmpv3_newpack(dev, dev->mtu);
466 }
467 }
468 first = 1;
469 psf_prev = NULL;
470 for (psf = *psf_list; psf; psf = psf_next) {
471 __be32 *psrc;
472
473 psf_next = psf->sf_next;
474
475 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
476 psf_prev = psf;
477 continue;
478 }
479
480 /* clear marks on query responses */
481 if (isquery)
482 psf->sf_gsresp = 0;
483
484 if (AVAILABLE(skb) < sizeof(__be32) +
485 first*sizeof(struct igmpv3_grec)) {
486 if (truncate && !first)
487 break; /* truncate these */
488 if (pgr)
489 pgr->grec_nsrcs = htons(scount);
490 if (skb)
491 igmpv3_sendpack(skb);
492 skb = igmpv3_newpack(dev, dev->mtu);
493 first = 1;
494 scount = 0;
495 }
496 if (first) {
497 skb = add_grhead(skb, pmc, type, &pgr);
498 first = 0;
499 }
500 if (!skb)
501 return NULL;
502 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
503 *psrc = psf->sf_inaddr;
504 scount++; stotal++;
505 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
506 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
507 psf->sf_crcount--;
508 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
509 if (psf_prev)
510 psf_prev->sf_next = psf->sf_next;
511 else
512 *psf_list = psf->sf_next;
513 kfree(psf);
514 continue;
515 }
516 }
517 psf_prev = psf;
518 }
519
520 empty_source:
521 if (!stotal) {
522 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
523 type == IGMPV3_BLOCK_OLD_SOURCES)
524 return skb;
525 if (pmc->crcount || isquery) {
526 /* make sure we have room for group header */
527 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
528 igmpv3_sendpack(skb);
529 skb = NULL; /* add_grhead will get a new one */
530 }
531 skb = add_grhead(skb, pmc, type, &pgr);
532 }
533 }
534 if (pgr)
535 pgr->grec_nsrcs = htons(scount);
536
537 if (isquery)
538 pmc->gsquery = 0; /* clear query state on report */
539 return skb;
540 }
541
542 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
543 {
544 struct sk_buff *skb = NULL;
545 int type;
546
547 if (!pmc) {
548 rcu_read_lock();
549 for_each_pmc_rcu(in_dev, pmc) {
550 if (pmc->multiaddr == IGMP_ALL_HOSTS)
551 continue;
552 if (ipv4_is_local_multicast(pmc->multiaddr) &&
553 !sysctl_igmp_llm_reports)
554 continue;
555 spin_lock_bh(&pmc->lock);
556 if (pmc->sfcount[MCAST_EXCLUDE])
557 type = IGMPV3_MODE_IS_EXCLUDE;
558 else
559 type = IGMPV3_MODE_IS_INCLUDE;
560 skb = add_grec(skb, pmc, type, 0, 0);
561 spin_unlock_bh(&pmc->lock);
562 }
563 rcu_read_unlock();
564 } else {
565 spin_lock_bh(&pmc->lock);
566 if (pmc->sfcount[MCAST_EXCLUDE])
567 type = IGMPV3_MODE_IS_EXCLUDE;
568 else
569 type = IGMPV3_MODE_IS_INCLUDE;
570 skb = add_grec(skb, pmc, type, 0, 0);
571 spin_unlock_bh(&pmc->lock);
572 }
573 if (!skb)
574 return 0;
575 return igmpv3_sendpack(skb);
576 }
577
578 /*
579 * remove zero-count source records from a source filter list
580 */
581 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
582 {
583 struct ip_sf_list *psf_prev, *psf_next, *psf;
584
585 psf_prev = NULL;
586 for (psf = *ppsf; psf; psf = psf_next) {
587 psf_next = psf->sf_next;
588 if (psf->sf_crcount == 0) {
589 if (psf_prev)
590 psf_prev->sf_next = psf->sf_next;
591 else
592 *ppsf = psf->sf_next;
593 kfree(psf);
594 } else
595 psf_prev = psf;
596 }
597 }
598
599 static void igmpv3_send_cr(struct in_device *in_dev)
600 {
601 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
602 struct sk_buff *skb = NULL;
603 int type, dtype;
604
605 rcu_read_lock();
606 spin_lock_bh(&in_dev->mc_tomb_lock);
607
608 /* deleted MCA's */
609 pmc_prev = NULL;
610 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
611 pmc_next = pmc->next;
612 if (pmc->sfmode == MCAST_INCLUDE) {
613 type = IGMPV3_BLOCK_OLD_SOURCES;
614 dtype = IGMPV3_BLOCK_OLD_SOURCES;
615 skb = add_grec(skb, pmc, type, 1, 0);
616 skb = add_grec(skb, pmc, dtype, 1, 1);
617 }
618 if (pmc->crcount) {
619 if (pmc->sfmode == MCAST_EXCLUDE) {
620 type = IGMPV3_CHANGE_TO_INCLUDE;
621 skb = add_grec(skb, pmc, type, 1, 0);
622 }
623 pmc->crcount--;
624 if (pmc->crcount == 0) {
625 igmpv3_clear_zeros(&pmc->tomb);
626 igmpv3_clear_zeros(&pmc->sources);
627 }
628 }
629 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
630 if (pmc_prev)
631 pmc_prev->next = pmc_next;
632 else
633 in_dev->mc_tomb = pmc_next;
634 in_dev_put(pmc->interface);
635 kfree(pmc);
636 } else
637 pmc_prev = pmc;
638 }
639 spin_unlock_bh(&in_dev->mc_tomb_lock);
640
641 /* change recs */
642 for_each_pmc_rcu(in_dev, pmc) {
643 spin_lock_bh(&pmc->lock);
644 if (pmc->sfcount[MCAST_EXCLUDE]) {
645 type = IGMPV3_BLOCK_OLD_SOURCES;
646 dtype = IGMPV3_ALLOW_NEW_SOURCES;
647 } else {
648 type = IGMPV3_ALLOW_NEW_SOURCES;
649 dtype = IGMPV3_BLOCK_OLD_SOURCES;
650 }
651 skb = add_grec(skb, pmc, type, 0, 0);
652 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
653
654 /* filter mode changes */
655 if (pmc->crcount) {
656 if (pmc->sfmode == MCAST_EXCLUDE)
657 type = IGMPV3_CHANGE_TO_EXCLUDE;
658 else
659 type = IGMPV3_CHANGE_TO_INCLUDE;
660 skb = add_grec(skb, pmc, type, 0, 0);
661 pmc->crcount--;
662 }
663 spin_unlock_bh(&pmc->lock);
664 }
665 rcu_read_unlock();
666
667 if (!skb)
668 return;
669 (void) igmpv3_sendpack(skb);
670 }
671
672 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
673 int type)
674 {
675 struct sk_buff *skb;
676 struct iphdr *iph;
677 struct igmphdr *ih;
678 struct rtable *rt;
679 struct net_device *dev = in_dev->dev;
680 struct net *net = dev_net(dev);
681 __be32 group = pmc ? pmc->multiaddr : 0;
682 struct flowi4 fl4;
683 __be32 dst;
684 int hlen, tlen;
685
686 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
687 return igmpv3_send_report(in_dev, pmc);
688
689 if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
690 return 0;
691
692 if (type == IGMP_HOST_LEAVE_MESSAGE)
693 dst = IGMP_ALL_ROUTER;
694 else
695 dst = group;
696
697 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
698 0, 0,
699 IPPROTO_IGMP, 0, dev->ifindex);
700 if (IS_ERR(rt))
701 return -1;
702
703 hlen = LL_RESERVED_SPACE(dev);
704 tlen = dev->needed_tailroom;
705 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
706 if (!skb) {
707 ip_rt_put(rt);
708 return -1;
709 }
710 skb->priority = TC_PRIO_CONTROL;
711
712 skb_dst_set(skb, &rt->dst);
713
714 skb_reserve(skb, hlen);
715
716 skb_reset_network_header(skb);
717 iph = ip_hdr(skb);
718 skb_put(skb, sizeof(struct iphdr) + 4);
719
720 iph->version = 4;
721 iph->ihl = (sizeof(struct iphdr)+4)>>2;
722 iph->tos = 0xc0;
723 iph->frag_off = htons(IP_DF);
724 iph->ttl = 1;
725 iph->daddr = dst;
726 iph->saddr = fl4.saddr;
727 iph->protocol = IPPROTO_IGMP;
728 ip_select_ident(net, skb, NULL);
729 ((u8 *)&iph[1])[0] = IPOPT_RA;
730 ((u8 *)&iph[1])[1] = 4;
731 ((u8 *)&iph[1])[2] = 0;
732 ((u8 *)&iph[1])[3] = 0;
733
734 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
735 ih->type = type;
736 ih->code = 0;
737 ih->csum = 0;
738 ih->group = group;
739 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
740
741 return ip_local_out(net, skb->sk, skb);
742 }
743
744 static void igmp_gq_timer_expire(unsigned long data)
745 {
746 struct in_device *in_dev = (struct in_device *)data;
747
748 in_dev->mr_gq_running = 0;
749 igmpv3_send_report(in_dev, NULL);
750 in_dev_put(in_dev);
751 }
752
753 static void igmp_ifc_timer_expire(unsigned long data)
754 {
755 struct in_device *in_dev = (struct in_device *)data;
756
757 igmpv3_send_cr(in_dev);
758 if (in_dev->mr_ifc_count) {
759 in_dev->mr_ifc_count--;
760 igmp_ifc_start_timer(in_dev,
761 unsolicited_report_interval(in_dev));
762 }
763 in_dev_put(in_dev);
764 }
765
766 static void igmp_ifc_event(struct in_device *in_dev)
767 {
768 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
769 return;
770 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
771 igmp_ifc_start_timer(in_dev, 1);
772 }
773
774
775 static void igmp_timer_expire(unsigned long data)
776 {
777 struct ip_mc_list *im = (struct ip_mc_list *)data;
778 struct in_device *in_dev = im->interface;
779
780 spin_lock(&im->lock);
781 im->tm_running = 0;
782
783 if (im->unsolicit_count) {
784 im->unsolicit_count--;
785 igmp_start_timer(im, unsolicited_report_interval(in_dev));
786 }
787 im->reporter = 1;
788 spin_unlock(&im->lock);
789
790 if (IGMP_V1_SEEN(in_dev))
791 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
792 else if (IGMP_V2_SEEN(in_dev))
793 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
794 else
795 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
796
797 ip_ma_put(im);
798 }
799
800 /* mark EXCLUDE-mode sources */
801 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
802 {
803 struct ip_sf_list *psf;
804 int i, scount;
805
806 scount = 0;
807 for (psf = pmc->sources; psf; psf = psf->sf_next) {
808 if (scount == nsrcs)
809 break;
810 for (i = 0; i < nsrcs; i++) {
811 /* skip inactive filters */
812 if (psf->sf_count[MCAST_INCLUDE] ||
813 pmc->sfcount[MCAST_EXCLUDE] !=
814 psf->sf_count[MCAST_EXCLUDE])
815 break;
816 if (srcs[i] == psf->sf_inaddr) {
817 scount++;
818 break;
819 }
820 }
821 }
822 pmc->gsquery = 0;
823 if (scount == nsrcs) /* all sources excluded */
824 return 0;
825 return 1;
826 }
827
828 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
829 {
830 struct ip_sf_list *psf;
831 int i, scount;
832
833 if (pmc->sfmode == MCAST_EXCLUDE)
834 return igmp_xmarksources(pmc, nsrcs, srcs);
835
836 /* mark INCLUDE-mode sources */
837 scount = 0;
838 for (psf = pmc->sources; psf; psf = psf->sf_next) {
839 if (scount == nsrcs)
840 break;
841 for (i = 0; i < nsrcs; i++)
842 if (srcs[i] == psf->sf_inaddr) {
843 psf->sf_gsresp = 1;
844 scount++;
845 break;
846 }
847 }
848 if (!scount) {
849 pmc->gsquery = 0;
850 return 0;
851 }
852 pmc->gsquery = 1;
853 return 1;
854 }
855
856 /* return true if packet was dropped */
857 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
858 {
859 struct ip_mc_list *im;
860
861 /* Timers are only set for non-local groups */
862
863 if (group == IGMP_ALL_HOSTS)
864 return false;
865 if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
866 return false;
867
868 rcu_read_lock();
869 for_each_pmc_rcu(in_dev, im) {
870 if (im->multiaddr == group) {
871 igmp_stop_timer(im);
872 break;
873 }
874 }
875 rcu_read_unlock();
876 return false;
877 }
878
879 /* return true if packet was dropped */
880 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
881 int len)
882 {
883 struct igmphdr *ih = igmp_hdr(skb);
884 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
885 struct ip_mc_list *im;
886 __be32 group = ih->group;
887 int max_delay;
888 int mark = 0;
889
890
891 if (len == 8) {
892 if (ih->code == 0) {
893 /* Alas, old v1 router presents here. */
894
895 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
896 in_dev->mr_v1_seen = jiffies +
897 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
898 group = 0;
899 } else {
900 /* v2 router present */
901 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
902 in_dev->mr_v2_seen = jiffies +
903 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
904 }
905 /* cancel the interface change timer */
906 in_dev->mr_ifc_count = 0;
907 if (del_timer(&in_dev->mr_ifc_timer))
908 __in_dev_put(in_dev);
909 /* clear deleted report items */
910 igmpv3_clear_delrec(in_dev);
911 } else if (len < 12) {
912 return true; /* ignore bogus packet; freed by caller */
913 } else if (IGMP_V1_SEEN(in_dev)) {
914 /* This is a v3 query with v1 queriers present */
915 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
916 group = 0;
917 } else if (IGMP_V2_SEEN(in_dev)) {
918 /* this is a v3 query with v2 queriers present;
919 * Interpretation of the max_delay code is problematic here.
920 * A real v2 host would use ih_code directly, while v3 has a
921 * different encoding. We use the v3 encoding as more likely
922 * to be intended in a v3 query.
923 */
924 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
925 if (!max_delay)
926 max_delay = 1; /* can't mod w/ 0 */
927 } else { /* v3 */
928 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
929 return true;
930
931 ih3 = igmpv3_query_hdr(skb);
932 if (ih3->nsrcs) {
933 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
934 + ntohs(ih3->nsrcs)*sizeof(__be32)))
935 return true;
936 ih3 = igmpv3_query_hdr(skb);
937 }
938
939 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
940 if (!max_delay)
941 max_delay = 1; /* can't mod w/ 0 */
942 in_dev->mr_maxdelay = max_delay;
943 if (ih3->qrv)
944 in_dev->mr_qrv = ih3->qrv;
945 if (!group) { /* general query */
946 if (ih3->nsrcs)
947 return true; /* no sources allowed */
948 igmp_gq_start_timer(in_dev);
949 return false;
950 }
951 /* mark sources to include, if group & source-specific */
952 mark = ih3->nsrcs != 0;
953 }
954
955 /*
956 * - Start the timers in all of our membership records
957 * that the query applies to for the interface on
958 * which the query arrived excl. those that belong
959 * to a "local" group (224.0.0.X)
960 * - For timers already running check if they need to
961 * be reset.
962 * - Use the igmp->igmp_code field as the maximum
963 * delay possible
964 */
965 rcu_read_lock();
966 for_each_pmc_rcu(in_dev, im) {
967 int changed;
968
969 if (group && group != im->multiaddr)
970 continue;
971 if (im->multiaddr == IGMP_ALL_HOSTS)
972 continue;
973 if (ipv4_is_local_multicast(im->multiaddr) &&
974 !sysctl_igmp_llm_reports)
975 continue;
976 spin_lock_bh(&im->lock);
977 if (im->tm_running)
978 im->gsquery = im->gsquery && mark;
979 else
980 im->gsquery = mark;
981 changed = !im->gsquery ||
982 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
983 spin_unlock_bh(&im->lock);
984 if (changed)
985 igmp_mod_timer(im, max_delay);
986 }
987 rcu_read_unlock();
988 return false;
989 }
990
991 /* called in rcu_read_lock() section */
992 int igmp_rcv(struct sk_buff *skb)
993 {
994 /* This basically follows the spec line by line -- see RFC1112 */
995 struct igmphdr *ih;
996 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
997 int len = skb->len;
998 bool dropped = true;
999
1000 if (!in_dev)
1001 goto drop;
1002
1003 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1004 goto drop;
1005
1006 if (skb_checksum_simple_validate(skb))
1007 goto drop;
1008
1009 ih = igmp_hdr(skb);
1010 switch (ih->type) {
1011 case IGMP_HOST_MEMBERSHIP_QUERY:
1012 dropped = igmp_heard_query(in_dev, skb, len);
1013 break;
1014 case IGMP_HOST_MEMBERSHIP_REPORT:
1015 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1016 /* Is it our report looped back? */
1017 if (rt_is_output_route(skb_rtable(skb)))
1018 break;
1019 /* don't rely on MC router hearing unicast reports */
1020 if (skb->pkt_type == PACKET_MULTICAST ||
1021 skb->pkt_type == PACKET_BROADCAST)
1022 dropped = igmp_heard_report(in_dev, ih->group);
1023 break;
1024 case IGMP_PIM:
1025 #ifdef CONFIG_IP_PIMSM_V1
1026 return pim_rcv_v1(skb);
1027 #endif
1028 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1029 case IGMP_DVMRP:
1030 case IGMP_TRACE:
1031 case IGMP_HOST_LEAVE_MESSAGE:
1032 case IGMP_MTRACE:
1033 case IGMP_MTRACE_RESP:
1034 break;
1035 default:
1036 break;
1037 }
1038
1039 drop:
1040 if (dropped)
1041 kfree_skb(skb);
1042 else
1043 consume_skb(skb);
1044 return 0;
1045 }
1046
1047 #endif
1048
1049
1050 /*
1051 * Add a filter to a device
1052 */
1053
1054 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1055 {
1056 char buf[MAX_ADDR_LEN];
1057 struct net_device *dev = in_dev->dev;
1058
1059 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1060 We will get multicast token leakage, when IFF_MULTICAST
1061 is changed. This check should be done in ndo_set_rx_mode
1062 routine. Something sort of:
1063 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1064 --ANK
1065 */
1066 if (arp_mc_map(addr, buf, dev, 0) == 0)
1067 dev_mc_add(dev, buf);
1068 }
1069
1070 /*
1071 * Remove a filter from a device
1072 */
1073
1074 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1075 {
1076 char buf[MAX_ADDR_LEN];
1077 struct net_device *dev = in_dev->dev;
1078
1079 if (arp_mc_map(addr, buf, dev, 0) == 0)
1080 dev_mc_del(dev, buf);
1081 }
1082
1083 #ifdef CONFIG_IP_MULTICAST
1084 /*
1085 * deleted ip_mc_list manipulation
1086 */
1087 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1088 {
1089 struct ip_mc_list *pmc;
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 ?: 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 int reporter;
1190 #endif
1191
1192 if (im->loaded) {
1193 im->loaded = 0;
1194 ip_mc_filter_del(in_dev, im->multiaddr);
1195 }
1196
1197 #ifdef CONFIG_IP_MULTICAST
1198 if (im->multiaddr == IGMP_ALL_HOSTS)
1199 return;
1200 if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports)
1201 return;
1202
1203 reporter = im->reporter;
1204 igmp_stop_timer(im);
1205
1206 if (!in_dev->dead) {
1207 if (IGMP_V1_SEEN(in_dev))
1208 return;
1209 if (IGMP_V2_SEEN(in_dev)) {
1210 if (reporter)
1211 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1212 return;
1213 }
1214 /* IGMPv3 */
1215 igmpv3_add_delrec(in_dev, im);
1216
1217 igmp_ifc_event(in_dev);
1218 }
1219 #endif
1220 }
1221
1222 static void igmp_group_added(struct ip_mc_list *im)
1223 {
1224 struct in_device *in_dev = im->interface;
1225
1226 if (im->loaded == 0) {
1227 im->loaded = 1;
1228 ip_mc_filter_add(in_dev, im->multiaddr);
1229 }
1230
1231 #ifdef CONFIG_IP_MULTICAST
1232 if (im->multiaddr == IGMP_ALL_HOSTS)
1233 return;
1234 if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports)
1235 return;
1236
1237 if (in_dev->dead)
1238 return;
1239 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1240 spin_lock_bh(&im->lock);
1241 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1242 spin_unlock_bh(&im->lock);
1243 return;
1244 }
1245 /* else, v3 */
1246
1247 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1248 igmp_ifc_event(in_dev);
1249 #endif
1250 }
1251
1252
1253 /*
1254 * Multicast list managers
1255 */
1256
1257 static u32 ip_mc_hash(const struct ip_mc_list *im)
1258 {
1259 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1260 }
1261
1262 static void ip_mc_hash_add(struct in_device *in_dev,
1263 struct ip_mc_list *im)
1264 {
1265 struct ip_mc_list __rcu **mc_hash;
1266 u32 hash;
1267
1268 mc_hash = rtnl_dereference(in_dev->mc_hash);
1269 if (mc_hash) {
1270 hash = ip_mc_hash(im);
1271 im->next_hash = mc_hash[hash];
1272 rcu_assign_pointer(mc_hash[hash], im);
1273 return;
1274 }
1275
1276 /* do not use a hash table for small number of items */
1277 if (in_dev->mc_count < 4)
1278 return;
1279
1280 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1281 GFP_KERNEL);
1282 if (!mc_hash)
1283 return;
1284
1285 for_each_pmc_rtnl(in_dev, im) {
1286 hash = ip_mc_hash(im);
1287 im->next_hash = mc_hash[hash];
1288 RCU_INIT_POINTER(mc_hash[hash], im);
1289 }
1290
1291 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1292 }
1293
1294 static void ip_mc_hash_remove(struct in_device *in_dev,
1295 struct ip_mc_list *im)
1296 {
1297 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1298 struct ip_mc_list *aux;
1299
1300 if (!mc_hash)
1301 return;
1302 mc_hash += ip_mc_hash(im);
1303 while ((aux = rtnl_dereference(*mc_hash)) != im)
1304 mc_hash = &aux->next_hash;
1305 *mc_hash = im->next_hash;
1306 }
1307
1308
1309 /*
1310 * A socket has joined a multicast group on device dev.
1311 */
1312
1313 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1314 {
1315 struct ip_mc_list *im;
1316
1317 ASSERT_RTNL();
1318
1319 for_each_pmc_rtnl(in_dev, im) {
1320 if (im->multiaddr == addr) {
1321 im->users++;
1322 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1323 goto out;
1324 }
1325 }
1326
1327 im = kzalloc(sizeof(*im), GFP_KERNEL);
1328 if (!im)
1329 goto out;
1330
1331 im->users = 1;
1332 im->interface = in_dev;
1333 in_dev_hold(in_dev);
1334 im->multiaddr = addr;
1335 /* initial mode is (EX, empty) */
1336 im->sfmode = MCAST_EXCLUDE;
1337 im->sfcount[MCAST_EXCLUDE] = 1;
1338 atomic_set(&im->refcnt, 1);
1339 spin_lock_init(&im->lock);
1340 #ifdef CONFIG_IP_MULTICAST
1341 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1342 im->unsolicit_count = sysctl_igmp_qrv;
1343 #endif
1344
1345 im->next_rcu = in_dev->mc_list;
1346 in_dev->mc_count++;
1347 rcu_assign_pointer(in_dev->mc_list, im);
1348
1349 ip_mc_hash_add(in_dev, im);
1350
1351 #ifdef CONFIG_IP_MULTICAST
1352 igmpv3_del_delrec(in_dev, im->multiaddr);
1353 #endif
1354 igmp_group_added(im);
1355 if (!in_dev->dead)
1356 ip_rt_multicast_event(in_dev);
1357 out:
1358 return;
1359 }
1360 EXPORT_SYMBOL(ip_mc_inc_group);
1361
1362 static int ip_mc_check_iphdr(struct sk_buff *skb)
1363 {
1364 const struct iphdr *iph;
1365 unsigned int len;
1366 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1367
1368 if (!pskb_may_pull(skb, offset))
1369 return -EINVAL;
1370
1371 iph = ip_hdr(skb);
1372
1373 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1374 return -EINVAL;
1375
1376 offset += ip_hdrlen(skb) - sizeof(*iph);
1377
1378 if (!pskb_may_pull(skb, offset))
1379 return -EINVAL;
1380
1381 iph = ip_hdr(skb);
1382
1383 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1384 return -EINVAL;
1385
1386 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1387 if (skb->len < len || len < offset)
1388 return -EINVAL;
1389
1390 skb_set_transport_header(skb, offset);
1391
1392 return 0;
1393 }
1394
1395 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1396 {
1397 unsigned int len = skb_transport_offset(skb);
1398
1399 len += sizeof(struct igmpv3_report);
1400
1401 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1402 }
1403
1404 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1405 {
1406 unsigned int len = skb_transport_offset(skb);
1407
1408 len += sizeof(struct igmphdr);
1409 if (skb->len < len)
1410 return -EINVAL;
1411
1412 /* IGMPv{1,2}? */
1413 if (skb->len != len) {
1414 /* or IGMPv3? */
1415 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1416 if (skb->len < len || !pskb_may_pull(skb, len))
1417 return -EINVAL;
1418 }
1419
1420 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1421 * all-systems destination addresses (224.0.0.1) for general queries
1422 */
1423 if (!igmp_hdr(skb)->group &&
1424 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1425 return -EINVAL;
1426
1427 return 0;
1428 }
1429
1430 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1431 {
1432 switch (igmp_hdr(skb)->type) {
1433 case IGMP_HOST_LEAVE_MESSAGE:
1434 case IGMP_HOST_MEMBERSHIP_REPORT:
1435 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1436 /* fall through */
1437 return 0;
1438 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1439 return ip_mc_check_igmp_reportv3(skb);
1440 case IGMP_HOST_MEMBERSHIP_QUERY:
1441 return ip_mc_check_igmp_query(skb);
1442 default:
1443 return -ENOMSG;
1444 }
1445 }
1446
1447 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1448 {
1449 return skb_checksum_simple_validate(skb);
1450 }
1451
1452 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1453
1454 {
1455 struct sk_buff *skb_chk;
1456 unsigned int transport_len;
1457 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1458 int ret = -EINVAL;
1459
1460 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1461
1462 skb_chk = skb_checksum_trimmed(skb, transport_len,
1463 ip_mc_validate_checksum);
1464 if (!skb_chk)
1465 goto err;
1466
1467 if (!pskb_may_pull(skb_chk, len))
1468 goto err;
1469
1470 ret = ip_mc_check_igmp_msg(skb_chk);
1471 if (ret)
1472 goto err;
1473
1474 if (skb_trimmed)
1475 *skb_trimmed = skb_chk;
1476 /* free now unneeded clone */
1477 else if (skb_chk != skb)
1478 kfree_skb(skb_chk);
1479
1480 ret = 0;
1481
1482 err:
1483 if (ret && skb_chk && skb_chk != skb)
1484 kfree_skb(skb_chk);
1485
1486 return ret;
1487 }
1488
1489 /**
1490 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1491 * @skb: the skb to validate
1492 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1493 *
1494 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1495 * skb transport header accordingly and returns zero.
1496 *
1497 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1498 * standard
1499 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1500 * -ENOMEM: A memory allocation failure happened.
1501 *
1502 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1503 * to NULL): After parsing an IGMP packet successfully it will point to
1504 * an skb which has its tail aligned to the IP packet end. This might
1505 * either be the originally provided skb or a trimmed, cloned version if
1506 * the skb frame had data beyond the IP packet. A cloned skb allows us
1507 * to leave the original skb and its full frame unchanged (which might be
1508 * desirable for layer 2 frame jugglers).
1509 *
1510 * Caller needs to set the skb network header and free any returned skb if it
1511 * differs from the provided skb.
1512 */
1513 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1514 {
1515 int ret = ip_mc_check_iphdr(skb);
1516
1517 if (ret < 0)
1518 return ret;
1519
1520 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1521 return -ENOMSG;
1522
1523 return __ip_mc_check_igmp(skb, skb_trimmed);
1524 }
1525 EXPORT_SYMBOL(ip_mc_check_igmp);
1526
1527 /*
1528 * Resend IGMP JOIN report; used by netdev notifier.
1529 */
1530 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1531 {
1532 #ifdef CONFIG_IP_MULTICAST
1533 struct ip_mc_list *im;
1534 int type;
1535
1536 ASSERT_RTNL();
1537
1538 for_each_pmc_rtnl(in_dev, im) {
1539 if (im->multiaddr == IGMP_ALL_HOSTS)
1540 continue;
1541 if (ipv4_is_local_multicast(im->multiaddr) &&
1542 !sysctl_igmp_llm_reports)
1543 continue;
1544
1545 /* a failover is happening and switches
1546 * must be notified immediately
1547 */
1548 if (IGMP_V1_SEEN(in_dev))
1549 type = IGMP_HOST_MEMBERSHIP_REPORT;
1550 else if (IGMP_V2_SEEN(in_dev))
1551 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1552 else
1553 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1554 igmp_send_report(in_dev, im, type);
1555 }
1556 #endif
1557 }
1558
1559 /*
1560 * A socket has left a multicast group on device dev
1561 */
1562
1563 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1564 {
1565 struct ip_mc_list *i;
1566 struct ip_mc_list __rcu **ip;
1567
1568 ASSERT_RTNL();
1569
1570 for (ip = &in_dev->mc_list;
1571 (i = rtnl_dereference(*ip)) != NULL;
1572 ip = &i->next_rcu) {
1573 if (i->multiaddr == addr) {
1574 if (--i->users == 0) {
1575 ip_mc_hash_remove(in_dev, i);
1576 *ip = i->next_rcu;
1577 in_dev->mc_count--;
1578 igmp_group_dropped(i);
1579 ip_mc_clear_src(i);
1580
1581 if (!in_dev->dead)
1582 ip_rt_multicast_event(in_dev);
1583
1584 ip_ma_put(i);
1585 return;
1586 }
1587 break;
1588 }
1589 }
1590 }
1591 EXPORT_SYMBOL(ip_mc_dec_group);
1592
1593 /* Device changing type */
1594
1595 void ip_mc_unmap(struct in_device *in_dev)
1596 {
1597 struct ip_mc_list *pmc;
1598
1599 ASSERT_RTNL();
1600
1601 for_each_pmc_rtnl(in_dev, pmc)
1602 igmp_group_dropped(pmc);
1603 }
1604
1605 void ip_mc_remap(struct in_device *in_dev)
1606 {
1607 struct ip_mc_list *pmc;
1608
1609 ASSERT_RTNL();
1610
1611 for_each_pmc_rtnl(in_dev, pmc)
1612 igmp_group_added(pmc);
1613 }
1614
1615 /* Device going down */
1616
1617 void ip_mc_down(struct in_device *in_dev)
1618 {
1619 struct ip_mc_list *pmc;
1620
1621 ASSERT_RTNL();
1622
1623 for_each_pmc_rtnl(in_dev, pmc)
1624 igmp_group_dropped(pmc);
1625
1626 #ifdef CONFIG_IP_MULTICAST
1627 in_dev->mr_ifc_count = 0;
1628 if (del_timer(&in_dev->mr_ifc_timer))
1629 __in_dev_put(in_dev);
1630 in_dev->mr_gq_running = 0;
1631 if (del_timer(&in_dev->mr_gq_timer))
1632 __in_dev_put(in_dev);
1633 igmpv3_clear_delrec(in_dev);
1634 #endif
1635
1636 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1637 }
1638
1639 void ip_mc_init_dev(struct in_device *in_dev)
1640 {
1641 ASSERT_RTNL();
1642
1643 #ifdef CONFIG_IP_MULTICAST
1644 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1645 (unsigned long)in_dev);
1646 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1647 (unsigned long)in_dev);
1648 in_dev->mr_qrv = sysctl_igmp_qrv;
1649 #endif
1650
1651 spin_lock_init(&in_dev->mc_tomb_lock);
1652 }
1653
1654 /* Device going up */
1655
1656 void ip_mc_up(struct in_device *in_dev)
1657 {
1658 struct ip_mc_list *pmc;
1659
1660 ASSERT_RTNL();
1661
1662 #ifdef CONFIG_IP_MULTICAST
1663 in_dev->mr_qrv = sysctl_igmp_qrv;
1664 #endif
1665 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1666
1667 for_each_pmc_rtnl(in_dev, pmc)
1668 igmp_group_added(pmc);
1669 }
1670
1671 /*
1672 * Device is about to be destroyed: clean up.
1673 */
1674
1675 void ip_mc_destroy_dev(struct in_device *in_dev)
1676 {
1677 struct ip_mc_list *i;
1678
1679 ASSERT_RTNL();
1680
1681 /* Deactivate timers */
1682 ip_mc_down(in_dev);
1683
1684 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1685 in_dev->mc_list = i->next_rcu;
1686 in_dev->mc_count--;
1687
1688 /* We've dropped the groups in ip_mc_down already */
1689 ip_mc_clear_src(i);
1690 ip_ma_put(i);
1691 }
1692 }
1693
1694 /* RTNL is locked */
1695 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1696 {
1697 struct net_device *dev = NULL;
1698 struct in_device *idev = NULL;
1699
1700 if (imr->imr_ifindex) {
1701 idev = inetdev_by_index(net, imr->imr_ifindex);
1702 return idev;
1703 }
1704 if (imr->imr_address.s_addr) {
1705 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1706 if (!dev)
1707 return NULL;
1708 }
1709
1710 if (!dev) {
1711 struct rtable *rt = ip_route_output(net,
1712 imr->imr_multiaddr.s_addr,
1713 0, 0, 0);
1714 if (!IS_ERR(rt)) {
1715 dev = rt->dst.dev;
1716 ip_rt_put(rt);
1717 }
1718 }
1719 if (dev) {
1720 imr->imr_ifindex = dev->ifindex;
1721 idev = __in_dev_get_rtnl(dev);
1722 }
1723 return idev;
1724 }
1725
1726 /*
1727 * Join a socket to a group
1728 */
1729 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1730 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1731 #ifdef CONFIG_IP_MULTICAST
1732 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
1733 #endif
1734
1735 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1736 __be32 *psfsrc)
1737 {
1738 struct ip_sf_list *psf, *psf_prev;
1739 int rv = 0;
1740
1741 psf_prev = NULL;
1742 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1743 if (psf->sf_inaddr == *psfsrc)
1744 break;
1745 psf_prev = psf;
1746 }
1747 if (!psf || psf->sf_count[sfmode] == 0) {
1748 /* source filter not found, or count wrong => bug */
1749 return -ESRCH;
1750 }
1751 psf->sf_count[sfmode]--;
1752 if (psf->sf_count[sfmode] == 0) {
1753 ip_rt_multicast_event(pmc->interface);
1754 }
1755 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1756 #ifdef CONFIG_IP_MULTICAST
1757 struct in_device *in_dev = pmc->interface;
1758 #endif
1759
1760 /* no more filters for this source */
1761 if (psf_prev)
1762 psf_prev->sf_next = psf->sf_next;
1763 else
1764 pmc->sources = psf->sf_next;
1765 #ifdef CONFIG_IP_MULTICAST
1766 if (psf->sf_oldin &&
1767 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1768 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1769 psf->sf_next = pmc->tomb;
1770 pmc->tomb = psf;
1771 rv = 1;
1772 } else
1773 #endif
1774 kfree(psf);
1775 }
1776 return rv;
1777 }
1778
1779 #ifndef CONFIG_IP_MULTICAST
1780 #define igmp_ifc_event(x) do { } while (0)
1781 #endif
1782
1783 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1784 int sfcount, __be32 *psfsrc, int delta)
1785 {
1786 struct ip_mc_list *pmc;
1787 int changerec = 0;
1788 int i, err;
1789
1790 if (!in_dev)
1791 return -ENODEV;
1792 rcu_read_lock();
1793 for_each_pmc_rcu(in_dev, pmc) {
1794 if (*pmca == pmc->multiaddr)
1795 break;
1796 }
1797 if (!pmc) {
1798 /* MCA not found?? bug */
1799 rcu_read_unlock();
1800 return -ESRCH;
1801 }
1802 spin_lock_bh(&pmc->lock);
1803 rcu_read_unlock();
1804 #ifdef CONFIG_IP_MULTICAST
1805 sf_markstate(pmc);
1806 #endif
1807 if (!delta) {
1808 err = -EINVAL;
1809 if (!pmc->sfcount[sfmode])
1810 goto out_unlock;
1811 pmc->sfcount[sfmode]--;
1812 }
1813 err = 0;
1814 for (i = 0; i < sfcount; i++) {
1815 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1816
1817 changerec |= rv > 0;
1818 if (!err && rv < 0)
1819 err = rv;
1820 }
1821 if (pmc->sfmode == MCAST_EXCLUDE &&
1822 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1823 pmc->sfcount[MCAST_INCLUDE]) {
1824 #ifdef CONFIG_IP_MULTICAST
1825 struct ip_sf_list *psf;
1826 #endif
1827
1828 /* filter mode change */
1829 pmc->sfmode = MCAST_INCLUDE;
1830 #ifdef CONFIG_IP_MULTICAST
1831 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1832 in_dev->mr_ifc_count = pmc->crcount;
1833 for (psf = pmc->sources; psf; psf = psf->sf_next)
1834 psf->sf_crcount = 0;
1835 igmp_ifc_event(pmc->interface);
1836 } else if (sf_setstate(pmc) || changerec) {
1837 igmp_ifc_event(pmc->interface);
1838 #endif
1839 }
1840 out_unlock:
1841 spin_unlock_bh(&pmc->lock);
1842 return err;
1843 }
1844
1845 /*
1846 * Add multicast single-source filter to the interface list
1847 */
1848 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1849 __be32 *psfsrc)
1850 {
1851 struct ip_sf_list *psf, *psf_prev;
1852
1853 psf_prev = NULL;
1854 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1855 if (psf->sf_inaddr == *psfsrc)
1856 break;
1857 psf_prev = psf;
1858 }
1859 if (!psf) {
1860 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1861 if (!psf)
1862 return -ENOBUFS;
1863 psf->sf_inaddr = *psfsrc;
1864 if (psf_prev) {
1865 psf_prev->sf_next = psf;
1866 } else
1867 pmc->sources = psf;
1868 }
1869 psf->sf_count[sfmode]++;
1870 if (psf->sf_count[sfmode] == 1) {
1871 ip_rt_multicast_event(pmc->interface);
1872 }
1873 return 0;
1874 }
1875
1876 #ifdef CONFIG_IP_MULTICAST
1877 static void sf_markstate(struct ip_mc_list *pmc)
1878 {
1879 struct ip_sf_list *psf;
1880 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1881
1882 for (psf = pmc->sources; psf; psf = psf->sf_next)
1883 if (pmc->sfcount[MCAST_EXCLUDE]) {
1884 psf->sf_oldin = mca_xcount ==
1885 psf->sf_count[MCAST_EXCLUDE] &&
1886 !psf->sf_count[MCAST_INCLUDE];
1887 } else
1888 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1889 }
1890
1891 static int sf_setstate(struct ip_mc_list *pmc)
1892 {
1893 struct ip_sf_list *psf, *dpsf;
1894 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1895 int qrv = pmc->interface->mr_qrv;
1896 int new_in, rv;
1897
1898 rv = 0;
1899 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1900 if (pmc->sfcount[MCAST_EXCLUDE]) {
1901 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1902 !psf->sf_count[MCAST_INCLUDE];
1903 } else
1904 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1905 if (new_in) {
1906 if (!psf->sf_oldin) {
1907 struct ip_sf_list *prev = NULL;
1908
1909 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1910 if (dpsf->sf_inaddr == psf->sf_inaddr)
1911 break;
1912 prev = dpsf;
1913 }
1914 if (dpsf) {
1915 if (prev)
1916 prev->sf_next = dpsf->sf_next;
1917 else
1918 pmc->tomb = dpsf->sf_next;
1919 kfree(dpsf);
1920 }
1921 psf->sf_crcount = qrv;
1922 rv++;
1923 }
1924 } else if (psf->sf_oldin) {
1925
1926 psf->sf_crcount = 0;
1927 /*
1928 * add or update "delete" records if an active filter
1929 * is now inactive
1930 */
1931 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1932 if (dpsf->sf_inaddr == psf->sf_inaddr)
1933 break;
1934 if (!dpsf) {
1935 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1936 if (!dpsf)
1937 continue;
1938 *dpsf = *psf;
1939 /* pmc->lock held by callers */
1940 dpsf->sf_next = pmc->tomb;
1941 pmc->tomb = dpsf;
1942 }
1943 dpsf->sf_crcount = qrv;
1944 rv++;
1945 }
1946 }
1947 return rv;
1948 }
1949 #endif
1950
1951 /*
1952 * Add multicast source filter list to the interface list
1953 */
1954 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1955 int sfcount, __be32 *psfsrc, int delta)
1956 {
1957 struct ip_mc_list *pmc;
1958 int isexclude;
1959 int i, err;
1960
1961 if (!in_dev)
1962 return -ENODEV;
1963 rcu_read_lock();
1964 for_each_pmc_rcu(in_dev, pmc) {
1965 if (*pmca == pmc->multiaddr)
1966 break;
1967 }
1968 if (!pmc) {
1969 /* MCA not found?? bug */
1970 rcu_read_unlock();
1971 return -ESRCH;
1972 }
1973 spin_lock_bh(&pmc->lock);
1974 rcu_read_unlock();
1975
1976 #ifdef CONFIG_IP_MULTICAST
1977 sf_markstate(pmc);
1978 #endif
1979 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1980 if (!delta)
1981 pmc->sfcount[sfmode]++;
1982 err = 0;
1983 for (i = 0; i < sfcount; i++) {
1984 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1985 if (err)
1986 break;
1987 }
1988 if (err) {
1989 int j;
1990
1991 if (!delta)
1992 pmc->sfcount[sfmode]--;
1993 for (j = 0; j < i; j++)
1994 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1995 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1996 #ifdef CONFIG_IP_MULTICAST
1997 struct ip_sf_list *psf;
1998 in_dev = pmc->interface;
1999 #endif
2000
2001 /* filter mode change */
2002 if (pmc->sfcount[MCAST_EXCLUDE])
2003 pmc->sfmode = MCAST_EXCLUDE;
2004 else if (pmc->sfcount[MCAST_INCLUDE])
2005 pmc->sfmode = MCAST_INCLUDE;
2006 #ifdef CONFIG_IP_MULTICAST
2007 /* else no filters; keep old mode for reports */
2008
2009 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
2010 in_dev->mr_ifc_count = pmc->crcount;
2011 for (psf = pmc->sources; psf; psf = psf->sf_next)
2012 psf->sf_crcount = 0;
2013 igmp_ifc_event(in_dev);
2014 } else if (sf_setstate(pmc)) {
2015 igmp_ifc_event(in_dev);
2016 #endif
2017 }
2018 spin_unlock_bh(&pmc->lock);
2019 return err;
2020 }
2021
2022 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2023 {
2024 struct ip_sf_list *psf, *nextpsf;
2025
2026 for (psf = pmc->tomb; psf; psf = nextpsf) {
2027 nextpsf = psf->sf_next;
2028 kfree(psf);
2029 }
2030 pmc->tomb = NULL;
2031 for (psf = pmc->sources; psf; psf = nextpsf) {
2032 nextpsf = psf->sf_next;
2033 kfree(psf);
2034 }
2035 pmc->sources = NULL;
2036 pmc->sfmode = MCAST_EXCLUDE;
2037 pmc->sfcount[MCAST_INCLUDE] = 0;
2038 pmc->sfcount[MCAST_EXCLUDE] = 1;
2039 }
2040
2041 /* Join a multicast group
2042 */
2043
2044 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2045 {
2046 __be32 addr = imr->imr_multiaddr.s_addr;
2047 struct ip_mc_socklist *iml, *i;
2048 struct in_device *in_dev;
2049 struct inet_sock *inet = inet_sk(sk);
2050 struct net *net = sock_net(sk);
2051 int ifindex;
2052 int count = 0;
2053 int err;
2054
2055 ASSERT_RTNL();
2056
2057 if (!ipv4_is_multicast(addr))
2058 return -EINVAL;
2059
2060 in_dev = ip_mc_find_dev(net, imr);
2061
2062 if (!in_dev) {
2063 err = -ENODEV;
2064 goto done;
2065 }
2066
2067 err = -EADDRINUSE;
2068 ifindex = imr->imr_ifindex;
2069 for_each_pmc_rtnl(inet, i) {
2070 if (i->multi.imr_multiaddr.s_addr == addr &&
2071 i->multi.imr_ifindex == ifindex)
2072 goto done;
2073 count++;
2074 }
2075 err = -ENOBUFS;
2076 if (count >= sysctl_igmp_max_memberships)
2077 goto done;
2078 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2079 if (!iml)
2080 goto done;
2081
2082 memcpy(&iml->multi, imr, sizeof(*imr));
2083 iml->next_rcu = inet->mc_list;
2084 iml->sflist = NULL;
2085 iml->sfmode = MCAST_EXCLUDE;
2086 rcu_assign_pointer(inet->mc_list, iml);
2087 ip_mc_inc_group(in_dev, addr);
2088 err = 0;
2089 done:
2090 return err;
2091 }
2092 EXPORT_SYMBOL(ip_mc_join_group);
2093
2094 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2095 struct in_device *in_dev)
2096 {
2097 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2098 int err;
2099
2100 if (!psf) {
2101 /* any-source empty exclude case */
2102 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2103 iml->sfmode, 0, NULL, 0);
2104 }
2105 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2106 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2107 RCU_INIT_POINTER(iml->sflist, NULL);
2108 /* decrease mem now to avoid the memleak warning */
2109 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2110 kfree_rcu(psf, rcu);
2111 return err;
2112 }
2113
2114 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2115 {
2116 struct inet_sock *inet = inet_sk(sk);
2117 struct ip_mc_socklist *iml;
2118 struct ip_mc_socklist __rcu **imlp;
2119 struct in_device *in_dev;
2120 struct net *net = sock_net(sk);
2121 __be32 group = imr->imr_multiaddr.s_addr;
2122 u32 ifindex;
2123 int ret = -EADDRNOTAVAIL;
2124
2125 ASSERT_RTNL();
2126
2127 in_dev = ip_mc_find_dev(net, imr);
2128 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2129 ret = -ENODEV;
2130 goto out;
2131 }
2132 ifindex = imr->imr_ifindex;
2133 for (imlp = &inet->mc_list;
2134 (iml = rtnl_dereference(*imlp)) != NULL;
2135 imlp = &iml->next_rcu) {
2136 if (iml->multi.imr_multiaddr.s_addr != group)
2137 continue;
2138 if (ifindex) {
2139 if (iml->multi.imr_ifindex != ifindex)
2140 continue;
2141 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2142 iml->multi.imr_address.s_addr)
2143 continue;
2144
2145 (void) ip_mc_leave_src(sk, iml, in_dev);
2146
2147 *imlp = iml->next_rcu;
2148
2149 if (in_dev)
2150 ip_mc_dec_group(in_dev, group);
2151
2152 /* decrease mem now to avoid the memleak warning */
2153 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2154 kfree_rcu(iml, rcu);
2155 return 0;
2156 }
2157 out:
2158 return ret;
2159 }
2160 EXPORT_SYMBOL(ip_mc_leave_group);
2161
2162 int ip_mc_source(int add, int omode, struct sock *sk, struct
2163 ip_mreq_source *mreqs, int ifindex)
2164 {
2165 int err;
2166 struct ip_mreqn imr;
2167 __be32 addr = mreqs->imr_multiaddr;
2168 struct ip_mc_socklist *pmc;
2169 struct in_device *in_dev = NULL;
2170 struct inet_sock *inet = inet_sk(sk);
2171 struct ip_sf_socklist *psl;
2172 struct net *net = sock_net(sk);
2173 int leavegroup = 0;
2174 int i, j, rv;
2175
2176 if (!ipv4_is_multicast(addr))
2177 return -EINVAL;
2178
2179 ASSERT_RTNL();
2180
2181 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2182 imr.imr_address.s_addr = mreqs->imr_interface;
2183 imr.imr_ifindex = ifindex;
2184 in_dev = ip_mc_find_dev(net, &imr);
2185
2186 if (!in_dev) {
2187 err = -ENODEV;
2188 goto done;
2189 }
2190 err = -EADDRNOTAVAIL;
2191
2192 for_each_pmc_rtnl(inet, pmc) {
2193 if ((pmc->multi.imr_multiaddr.s_addr ==
2194 imr.imr_multiaddr.s_addr) &&
2195 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2196 break;
2197 }
2198 if (!pmc) { /* must have a prior join */
2199 err = -EINVAL;
2200 goto done;
2201 }
2202 /* if a source filter was set, must be the same mode as before */
2203 if (pmc->sflist) {
2204 if (pmc->sfmode != omode) {
2205 err = -EINVAL;
2206 goto done;
2207 }
2208 } else if (pmc->sfmode != omode) {
2209 /* allow mode switches for empty-set filters */
2210 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2211 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2212 NULL, 0);
2213 pmc->sfmode = omode;
2214 }
2215
2216 psl = rtnl_dereference(pmc->sflist);
2217 if (!add) {
2218 if (!psl)
2219 goto done; /* err = -EADDRNOTAVAIL */
2220 rv = !0;
2221 for (i = 0; i < psl->sl_count; i++) {
2222 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2223 sizeof(__be32));
2224 if (rv == 0)
2225 break;
2226 }
2227 if (rv) /* source not found */
2228 goto done; /* err = -EADDRNOTAVAIL */
2229
2230 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2231 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2232 leavegroup = 1;
2233 goto done;
2234 }
2235
2236 /* update the interface filter */
2237 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2238 &mreqs->imr_sourceaddr, 1);
2239
2240 for (j = i+1; j < psl->sl_count; j++)
2241 psl->sl_addr[j-1] = psl->sl_addr[j];
2242 psl->sl_count--;
2243 err = 0;
2244 goto done;
2245 }
2246 /* else, add a new source to the filter */
2247
2248 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2249 err = -ENOBUFS;
2250 goto done;
2251 }
2252 if (!psl || psl->sl_count == psl->sl_max) {
2253 struct ip_sf_socklist *newpsl;
2254 int count = IP_SFBLOCK;
2255
2256 if (psl)
2257 count += psl->sl_max;
2258 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2259 if (!newpsl) {
2260 err = -ENOBUFS;
2261 goto done;
2262 }
2263 newpsl->sl_max = count;
2264 newpsl->sl_count = count - IP_SFBLOCK;
2265 if (psl) {
2266 for (i = 0; i < psl->sl_count; i++)
2267 newpsl->sl_addr[i] = psl->sl_addr[i];
2268 /* decrease mem now to avoid the memleak warning */
2269 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2270 kfree_rcu(psl, rcu);
2271 }
2272 rcu_assign_pointer(pmc->sflist, newpsl);
2273 psl = newpsl;
2274 }
2275 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2276 for (i = 0; i < psl->sl_count; i++) {
2277 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2278 sizeof(__be32));
2279 if (rv == 0)
2280 break;
2281 }
2282 if (rv == 0) /* address already there is an error */
2283 goto done;
2284 for (j = psl->sl_count-1; j >= i; j--)
2285 psl->sl_addr[j+1] = psl->sl_addr[j];
2286 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2287 psl->sl_count++;
2288 err = 0;
2289 /* update the interface list */
2290 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2291 &mreqs->imr_sourceaddr, 1);
2292 done:
2293 if (leavegroup)
2294 err = ip_mc_leave_group(sk, &imr);
2295 return err;
2296 }
2297
2298 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2299 {
2300 int err = 0;
2301 struct ip_mreqn imr;
2302 __be32 addr = msf->imsf_multiaddr;
2303 struct ip_mc_socklist *pmc;
2304 struct in_device *in_dev;
2305 struct inet_sock *inet = inet_sk(sk);
2306 struct ip_sf_socklist *newpsl, *psl;
2307 struct net *net = sock_net(sk);
2308 int leavegroup = 0;
2309
2310 if (!ipv4_is_multicast(addr))
2311 return -EINVAL;
2312 if (msf->imsf_fmode != MCAST_INCLUDE &&
2313 msf->imsf_fmode != MCAST_EXCLUDE)
2314 return -EINVAL;
2315
2316 ASSERT_RTNL();
2317
2318 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2319 imr.imr_address.s_addr = msf->imsf_interface;
2320 imr.imr_ifindex = ifindex;
2321 in_dev = ip_mc_find_dev(net, &imr);
2322
2323 if (!in_dev) {
2324 err = -ENODEV;
2325 goto done;
2326 }
2327
2328 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2329 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2330 leavegroup = 1;
2331 goto done;
2332 }
2333
2334 for_each_pmc_rtnl(inet, pmc) {
2335 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2336 pmc->multi.imr_ifindex == imr.imr_ifindex)
2337 break;
2338 }
2339 if (!pmc) { /* must have a prior join */
2340 err = -EINVAL;
2341 goto done;
2342 }
2343 if (msf->imsf_numsrc) {
2344 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2345 GFP_KERNEL);
2346 if (!newpsl) {
2347 err = -ENOBUFS;
2348 goto done;
2349 }
2350 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2351 memcpy(newpsl->sl_addr, msf->imsf_slist,
2352 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2353 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2354 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2355 if (err) {
2356 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2357 goto done;
2358 }
2359 } else {
2360 newpsl = NULL;
2361 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2362 msf->imsf_fmode, 0, NULL, 0);
2363 }
2364 psl = rtnl_dereference(pmc->sflist);
2365 if (psl) {
2366 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2367 psl->sl_count, psl->sl_addr, 0);
2368 /* decrease mem now to avoid the memleak warning */
2369 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2370 kfree_rcu(psl, rcu);
2371 } else
2372 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2373 0, NULL, 0);
2374 rcu_assign_pointer(pmc->sflist, newpsl);
2375 pmc->sfmode = msf->imsf_fmode;
2376 err = 0;
2377 done:
2378 if (leavegroup)
2379 err = ip_mc_leave_group(sk, &imr);
2380 return err;
2381 }
2382
2383 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2384 struct ip_msfilter __user *optval, int __user *optlen)
2385 {
2386 int err, len, count, copycount;
2387 struct ip_mreqn imr;
2388 __be32 addr = msf->imsf_multiaddr;
2389 struct ip_mc_socklist *pmc;
2390 struct in_device *in_dev;
2391 struct inet_sock *inet = inet_sk(sk);
2392 struct ip_sf_socklist *psl;
2393 struct net *net = sock_net(sk);
2394
2395 ASSERT_RTNL();
2396
2397 if (!ipv4_is_multicast(addr))
2398 return -EINVAL;
2399
2400 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2401 imr.imr_address.s_addr = msf->imsf_interface;
2402 imr.imr_ifindex = 0;
2403 in_dev = ip_mc_find_dev(net, &imr);
2404
2405 if (!in_dev) {
2406 err = -ENODEV;
2407 goto done;
2408 }
2409 err = -EADDRNOTAVAIL;
2410
2411 for_each_pmc_rtnl(inet, pmc) {
2412 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2413 pmc->multi.imr_ifindex == imr.imr_ifindex)
2414 break;
2415 }
2416 if (!pmc) /* must have a prior join */
2417 goto done;
2418 msf->imsf_fmode = pmc->sfmode;
2419 psl = rtnl_dereference(pmc->sflist);
2420 if (!psl) {
2421 len = 0;
2422 count = 0;
2423 } else {
2424 count = psl->sl_count;
2425 }
2426 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2427 len = copycount * sizeof(psl->sl_addr[0]);
2428 msf->imsf_numsrc = count;
2429 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2430 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2431 return -EFAULT;
2432 }
2433 if (len &&
2434 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2435 return -EFAULT;
2436 return 0;
2437 done:
2438 return err;
2439 }
2440
2441 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2442 struct group_filter __user *optval, int __user *optlen)
2443 {
2444 int err, i, count, copycount;
2445 struct sockaddr_in *psin;
2446 __be32 addr;
2447 struct ip_mc_socklist *pmc;
2448 struct inet_sock *inet = inet_sk(sk);
2449 struct ip_sf_socklist *psl;
2450
2451 ASSERT_RTNL();
2452
2453 psin = (struct sockaddr_in *)&gsf->gf_group;
2454 if (psin->sin_family != AF_INET)
2455 return -EINVAL;
2456 addr = psin->sin_addr.s_addr;
2457 if (!ipv4_is_multicast(addr))
2458 return -EINVAL;
2459
2460 err = -EADDRNOTAVAIL;
2461
2462 for_each_pmc_rtnl(inet, pmc) {
2463 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2464 pmc->multi.imr_ifindex == gsf->gf_interface)
2465 break;
2466 }
2467 if (!pmc) /* must have a prior join */
2468 goto done;
2469 gsf->gf_fmode = pmc->sfmode;
2470 psl = rtnl_dereference(pmc->sflist);
2471 count = psl ? psl->sl_count : 0;
2472 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2473 gsf->gf_numsrc = count;
2474 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2475 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2476 return -EFAULT;
2477 }
2478 for (i = 0; i < copycount; i++) {
2479 struct sockaddr_storage ss;
2480
2481 psin = (struct sockaddr_in *)&ss;
2482 memset(&ss, 0, sizeof(ss));
2483 psin->sin_family = AF_INET;
2484 psin->sin_addr.s_addr = psl->sl_addr[i];
2485 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2486 return -EFAULT;
2487 }
2488 return 0;
2489 done:
2490 return err;
2491 }
2492
2493 /*
2494 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2495 */
2496 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2497 {
2498 struct inet_sock *inet = inet_sk(sk);
2499 struct ip_mc_socklist *pmc;
2500 struct ip_sf_socklist *psl;
2501 int i;
2502 int ret;
2503
2504 ret = 1;
2505 if (!ipv4_is_multicast(loc_addr))
2506 goto out;
2507
2508 rcu_read_lock();
2509 for_each_pmc_rcu(inet, pmc) {
2510 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2511 pmc->multi.imr_ifindex == dif)
2512 break;
2513 }
2514 ret = inet->mc_all;
2515 if (!pmc)
2516 goto unlock;
2517 psl = rcu_dereference(pmc->sflist);
2518 ret = (pmc->sfmode == MCAST_EXCLUDE);
2519 if (!psl)
2520 goto unlock;
2521
2522 for (i = 0; i < psl->sl_count; i++) {
2523 if (psl->sl_addr[i] == rmt_addr)
2524 break;
2525 }
2526 ret = 0;
2527 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2528 goto unlock;
2529 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2530 goto unlock;
2531 ret = 1;
2532 unlock:
2533 rcu_read_unlock();
2534 out:
2535 return ret;
2536 }
2537
2538 /*
2539 * A socket is closing.
2540 */
2541
2542 void ip_mc_drop_socket(struct sock *sk)
2543 {
2544 struct inet_sock *inet = inet_sk(sk);
2545 struct ip_mc_socklist *iml;
2546 struct net *net = sock_net(sk);
2547
2548 if (!inet->mc_list)
2549 return;
2550
2551 rtnl_lock();
2552 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2553 struct in_device *in_dev;
2554
2555 inet->mc_list = iml->next_rcu;
2556 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2557 (void) ip_mc_leave_src(sk, iml, in_dev);
2558 if (in_dev)
2559 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2560 /* decrease mem now to avoid the memleak warning */
2561 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2562 kfree_rcu(iml, rcu);
2563 }
2564 rtnl_unlock();
2565 }
2566
2567 /* called with rcu_read_lock() */
2568 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2569 {
2570 struct ip_mc_list *im;
2571 struct ip_mc_list __rcu **mc_hash;
2572 struct ip_sf_list *psf;
2573 int rv = 0;
2574
2575 mc_hash = rcu_dereference(in_dev->mc_hash);
2576 if (mc_hash) {
2577 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2578
2579 for (im = rcu_dereference(mc_hash[hash]);
2580 im != NULL;
2581 im = rcu_dereference(im->next_hash)) {
2582 if (im->multiaddr == mc_addr)
2583 break;
2584 }
2585 } else {
2586 for_each_pmc_rcu(in_dev, im) {
2587 if (im->multiaddr == mc_addr)
2588 break;
2589 }
2590 }
2591 if (im && proto == IPPROTO_IGMP) {
2592 rv = 1;
2593 } else if (im) {
2594 if (src_addr) {
2595 for (psf = im->sources; psf; psf = psf->sf_next) {
2596 if (psf->sf_inaddr == src_addr)
2597 break;
2598 }
2599 if (psf)
2600 rv = psf->sf_count[MCAST_INCLUDE] ||
2601 psf->sf_count[MCAST_EXCLUDE] !=
2602 im->sfcount[MCAST_EXCLUDE];
2603 else
2604 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2605 } else
2606 rv = 1; /* unspecified source; tentatively allow */
2607 }
2608 return rv;
2609 }
2610
2611 #if defined(CONFIG_PROC_FS)
2612 struct igmp_mc_iter_state {
2613 struct seq_net_private p;
2614 struct net_device *dev;
2615 struct in_device *in_dev;
2616 };
2617
2618 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2619
2620 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2621 {
2622 struct net *net = seq_file_net(seq);
2623 struct ip_mc_list *im = NULL;
2624 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2625
2626 state->in_dev = NULL;
2627 for_each_netdev_rcu(net, state->dev) {
2628 struct in_device *in_dev;
2629
2630 in_dev = __in_dev_get_rcu(state->dev);
2631 if (!in_dev)
2632 continue;
2633 im = rcu_dereference(in_dev->mc_list);
2634 if (im) {
2635 state->in_dev = in_dev;
2636 break;
2637 }
2638 }
2639 return im;
2640 }
2641
2642 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2643 {
2644 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2645
2646 im = rcu_dereference(im->next_rcu);
2647 while (!im) {
2648 state->dev = next_net_device_rcu(state->dev);
2649 if (!state->dev) {
2650 state->in_dev = NULL;
2651 break;
2652 }
2653 state->in_dev = __in_dev_get_rcu(state->dev);
2654 if (!state->in_dev)
2655 continue;
2656 im = rcu_dereference(state->in_dev->mc_list);
2657 }
2658 return im;
2659 }
2660
2661 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2662 {
2663 struct ip_mc_list *im = igmp_mc_get_first(seq);
2664 if (im)
2665 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2666 --pos;
2667 return pos ? NULL : im;
2668 }
2669
2670 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2671 __acquires(rcu)
2672 {
2673 rcu_read_lock();
2674 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2675 }
2676
2677 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2678 {
2679 struct ip_mc_list *im;
2680 if (v == SEQ_START_TOKEN)
2681 im = igmp_mc_get_first(seq);
2682 else
2683 im = igmp_mc_get_next(seq, v);
2684 ++*pos;
2685 return im;
2686 }
2687
2688 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2689 __releases(rcu)
2690 {
2691 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2692
2693 state->in_dev = NULL;
2694 state->dev = NULL;
2695 rcu_read_unlock();
2696 }
2697
2698 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2699 {
2700 if (v == SEQ_START_TOKEN)
2701 seq_puts(seq,
2702 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2703 else {
2704 struct ip_mc_list *im = (struct ip_mc_list *)v;
2705 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2706 char *querier;
2707 long delta;
2708
2709 #ifdef CONFIG_IP_MULTICAST
2710 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2711 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2712 "V3";
2713 #else
2714 querier = "NONE";
2715 #endif
2716
2717 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2718 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2719 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2720 }
2721
2722 delta = im->timer.expires - jiffies;
2723 seq_printf(seq,
2724 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2725 im->multiaddr, im->users,
2726 im->tm_running,
2727 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2728 im->reporter);
2729 }
2730 return 0;
2731 }
2732
2733 static const struct seq_operations igmp_mc_seq_ops = {
2734 .start = igmp_mc_seq_start,
2735 .next = igmp_mc_seq_next,
2736 .stop = igmp_mc_seq_stop,
2737 .show = igmp_mc_seq_show,
2738 };
2739
2740 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2741 {
2742 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2743 sizeof(struct igmp_mc_iter_state));
2744 }
2745
2746 static const struct file_operations igmp_mc_seq_fops = {
2747 .owner = THIS_MODULE,
2748 .open = igmp_mc_seq_open,
2749 .read = seq_read,
2750 .llseek = seq_lseek,
2751 .release = seq_release_net,
2752 };
2753
2754 struct igmp_mcf_iter_state {
2755 struct seq_net_private p;
2756 struct net_device *dev;
2757 struct in_device *idev;
2758 struct ip_mc_list *im;
2759 };
2760
2761 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2762
2763 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2764 {
2765 struct net *net = seq_file_net(seq);
2766 struct ip_sf_list *psf = NULL;
2767 struct ip_mc_list *im = NULL;
2768 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2769
2770 state->idev = NULL;
2771 state->im = NULL;
2772 for_each_netdev_rcu(net, state->dev) {
2773 struct in_device *idev;
2774 idev = __in_dev_get_rcu(state->dev);
2775 if (unlikely(!idev))
2776 continue;
2777 im = rcu_dereference(idev->mc_list);
2778 if (likely(im)) {
2779 spin_lock_bh(&im->lock);
2780 psf = im->sources;
2781 if (likely(psf)) {
2782 state->im = im;
2783 state->idev = idev;
2784 break;
2785 }
2786 spin_unlock_bh(&im->lock);
2787 }
2788 }
2789 return psf;
2790 }
2791
2792 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2793 {
2794 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2795
2796 psf = psf->sf_next;
2797 while (!psf) {
2798 spin_unlock_bh(&state->im->lock);
2799 state->im = state->im->next;
2800 while (!state->im) {
2801 state->dev = next_net_device_rcu(state->dev);
2802 if (!state->dev) {
2803 state->idev = NULL;
2804 goto out;
2805 }
2806 state->idev = __in_dev_get_rcu(state->dev);
2807 if (!state->idev)
2808 continue;
2809 state->im = rcu_dereference(state->idev->mc_list);
2810 }
2811 if (!state->im)
2812 break;
2813 spin_lock_bh(&state->im->lock);
2814 psf = state->im->sources;
2815 }
2816 out:
2817 return psf;
2818 }
2819
2820 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2821 {
2822 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2823 if (psf)
2824 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2825 --pos;
2826 return pos ? NULL : psf;
2827 }
2828
2829 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2830 __acquires(rcu)
2831 {
2832 rcu_read_lock();
2833 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2834 }
2835
2836 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2837 {
2838 struct ip_sf_list *psf;
2839 if (v == SEQ_START_TOKEN)
2840 psf = igmp_mcf_get_first(seq);
2841 else
2842 psf = igmp_mcf_get_next(seq, v);
2843 ++*pos;
2844 return psf;
2845 }
2846
2847 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2848 __releases(rcu)
2849 {
2850 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2851 if (likely(state->im)) {
2852 spin_unlock_bh(&state->im->lock);
2853 state->im = NULL;
2854 }
2855 state->idev = NULL;
2856 state->dev = NULL;
2857 rcu_read_unlock();
2858 }
2859
2860 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2861 {
2862 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2863 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2864
2865 if (v == SEQ_START_TOKEN) {
2866 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2867 } else {
2868 seq_printf(seq,
2869 "%3d %6.6s 0x%08x "
2870 "0x%08x %6lu %6lu\n",
2871 state->dev->ifindex, state->dev->name,
2872 ntohl(state->im->multiaddr),
2873 ntohl(psf->sf_inaddr),
2874 psf->sf_count[MCAST_INCLUDE],
2875 psf->sf_count[MCAST_EXCLUDE]);
2876 }
2877 return 0;
2878 }
2879
2880 static const struct seq_operations igmp_mcf_seq_ops = {
2881 .start = igmp_mcf_seq_start,
2882 .next = igmp_mcf_seq_next,
2883 .stop = igmp_mcf_seq_stop,
2884 .show = igmp_mcf_seq_show,
2885 };
2886
2887 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2888 {
2889 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2890 sizeof(struct igmp_mcf_iter_state));
2891 }
2892
2893 static const struct file_operations igmp_mcf_seq_fops = {
2894 .owner = THIS_MODULE,
2895 .open = igmp_mcf_seq_open,
2896 .read = seq_read,
2897 .llseek = seq_lseek,
2898 .release = seq_release_net,
2899 };
2900
2901 static int __net_init igmp_net_init(struct net *net)
2902 {
2903 struct proc_dir_entry *pde;
2904 int err;
2905
2906 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2907 if (!pde)
2908 goto out_igmp;
2909 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2910 &igmp_mcf_seq_fops);
2911 if (!pde)
2912 goto out_mcfilter;
2913 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2914 SOCK_DGRAM, 0, net);
2915 if (err < 0) {
2916 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2917 err);
2918 goto out_sock;
2919 }
2920
2921 return 0;
2922
2923 out_sock:
2924 remove_proc_entry("mcfilter", net->proc_net);
2925 out_mcfilter:
2926 remove_proc_entry("igmp", net->proc_net);
2927 out_igmp:
2928 return -ENOMEM;
2929 }
2930
2931 static void __net_exit igmp_net_exit(struct net *net)
2932 {
2933 remove_proc_entry("mcfilter", net->proc_net);
2934 remove_proc_entry("igmp", net->proc_net);
2935 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2936 }
2937
2938 static struct pernet_operations igmp_net_ops = {
2939 .init = igmp_net_init,
2940 .exit = igmp_net_exit,
2941 };
2942 #endif
2943
2944 static int igmp_netdev_event(struct notifier_block *this,
2945 unsigned long event, void *ptr)
2946 {
2947 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2948 struct in_device *in_dev;
2949
2950 switch (event) {
2951 case NETDEV_RESEND_IGMP:
2952 in_dev = __in_dev_get_rtnl(dev);
2953 if (in_dev)
2954 ip_mc_rejoin_groups(in_dev);
2955 break;
2956 default:
2957 break;
2958 }
2959 return NOTIFY_DONE;
2960 }
2961
2962 static struct notifier_block igmp_notifier = {
2963 .notifier_call = igmp_netdev_event,
2964 };
2965
2966 int __init igmp_mc_init(void)
2967 {
2968 #if defined(CONFIG_PROC_FS)
2969 int err;
2970
2971 err = register_pernet_subsys(&igmp_net_ops);
2972 if (err)
2973 return err;
2974 err = register_netdevice_notifier(&igmp_notifier);
2975 if (err)
2976 goto reg_notif_fail;
2977 return 0;
2978
2979 reg_notif_fail:
2980 unregister_pernet_subsys(&igmp_net_ops);
2981 return err;
2982 #else
2983 return register_netdevice_notifier(&igmp_notifier);
2984 #endif
2985 }
Linux kernel - Deliverables
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