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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / net / ipv4 / igmp.c
blob732cd07e6071bdc0aa9b514286bdd80ec934183d
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 * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
12 *
13 * Authors:
14 * Alan Cox <Alan.Cox@linux.org>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 *
21 * Fixes:
22 *
23 * Alan Cox : Added lots of __inline__ to optimise
24 * the memory usage of all the tiny little
25 * functions.
26 * Alan Cox : Dumped the header building experiment.
27 * Alan Cox : Minor tweaks ready for multicast routing
28 * and extended IGMP protocol.
29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
30 * writes utterly bogus code otherwise (sigh)
31 * fixed IGMP loopback to behave in the manner
32 * desired by mrouted, fixed the fact it has been
33 * broken since 1.3.6 and cleaned up a few minor
34 * points.
35 *
36 * Chih-Jen Chang : Tried to revise IGMP to Version 2
37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
38 * The enhancements are mainly based on Steve Deering's
39 * ipmulti-3.5 source code.
40 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
41 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
42 * the mrouted version on that device.
43 * Chih-Jen Chang : Added the max_resp_time parameter to
44 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
45 * to identify the multicast router version
46 * and do what the IGMP version 2 specified.
47 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
48 * Tsu-Sheng Tsao if the specified time expired.
49 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
50 * Alan Cox : Use GFP_ATOMIC in the right places.
51 * Christian Daudt : igmp timer wasn't set for local group
52 * memberships but was being deleted,
53 * which caused a "del_timer() called
54 * from %p with timer not initialized\n"
55 * message (960131).
56 * Christian Daudt : removed del_timer from
57 * igmp_timer_expire function (960205).
58 * Christian Daudt : igmp_heard_report now only calls
59 * igmp_timer_expire if tm->running is
60 * true (960216).
61 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
62 * igmp_heard_query never trigger. Expiry
63 * miscalculation fixed in igmp_heard_query
64 * and random() made to return unsigned to
65 * prevent negative expiry times.
66 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
67 * fix from pending 2.1.x patches.
68 * Alan Cox: Forget to enable FDDI support earlier.
69 * Alexey Kuznetsov: Fixed leaving groups on device down.
70 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
71 * David L Stevens: IGMPv3 support, with help from
72 * Vinay Kulkarni
73 */
74
75 #include <linux/module.h>
76 #include <asm/uaccess.h>
77 #include <asm/system.h>
78 #include <linux/types.h>
79 #include <linux/kernel.h>
80 #include <linux/jiffies.h>
81 #include <linux/string.h>
82 #include <linux/socket.h>
83 #include <linux/sockios.h>
84 #include <linux/in.h>
85 #include <linux/inet.h>
86 #include <linux/netdevice.h>
87 #include <linux/skbuff.h>
88 #include <linux/inetdevice.h>
89 #include <linux/igmp.h>
90 #include <linux/if_arp.h>
91 #include <linux/rtnetlink.h>
92 #include <linux/times.h>
93
94 #include <net/net_namespace.h>
95 #include <net/arp.h>
96 #include <net/ip.h>
97 #include <net/protocol.h>
98 #include <net/route.h>
99 #include <net/sock.h>
100 #include <net/checksum.h>
101 #include <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 #ifdef CONFIG_IP_MULTICAST
114 /* Parameter names and values are taken from igmp-v2-06 draft */
115
116 #define IGMP_V1_Router_Present_Timeout (400*HZ)
117 #define IGMP_V2_Router_Present_Timeout (400*HZ)
118 #define IGMP_Unsolicited_Report_Interval (10*HZ)
119 #define IGMP_Query_Response_Interval (10*HZ)
120 #define IGMP_Unsolicited_Report_Count 2
121
122
123 #define IGMP_Initial_Report_Delay (1)
124
125 /* IGMP_Initial_Report_Delay is not from IGMP specs!
126 * IGMP specs require to report membership immediately after
127 * joining a group, but we delay the first report by a
128 * small interval. It seems more natural and still does not
129 * contradict to specs provided this delay is small enough.
130 */
131
132 #define IGMP_V1_SEEN(in_dev) \
133 (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, FORCE_IGMP_VERSION) == 1 || \
134 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
135 ((in_dev)->mr_v1_seen && \
136 time_before(jiffies, (in_dev)->mr_v1_seen)))
137 #define IGMP_V2_SEEN(in_dev) \
138 (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, FORCE_IGMP_VERSION) == 2 || \
139 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
140 ((in_dev)->mr_v2_seen && \
141 time_before(jiffies, (in_dev)->mr_v2_seen)))
142
143 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
144 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
145 static void igmpv3_clear_delrec(struct in_device *in_dev);
146 static int sf_setstate(struct ip_mc_list *pmc);
147 static void sf_markstate(struct ip_mc_list *pmc);
148 #endif
149 static void ip_mc_clear_src(struct ip_mc_list *pmc);
150 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
151 int sfcount, __be32 *psfsrc, int delta);
152
153 static void ip_ma_put(struct ip_mc_list *im)
154 {
155 if (atomic_dec_and_test(&im->refcnt)) {
156 in_dev_put(im->interface);
157 kfree(im);
158 }
159 }
160
161 #ifdef CONFIG_IP_MULTICAST
162
163 /*
164 * Timer management
165 */
166
167 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
168 {
169 spin_lock_bh(&im->lock);
170 if (del_timer(&im->timer))
171 atomic_dec(&im->refcnt);
172 im->tm_running=0;
173 im->reporter = 0;
174 im->unsolicit_count = 0;
175 spin_unlock_bh(&im->lock);
176 }
177
178 /* It must be called with locked im->lock */
179 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
180 {
181 int tv=net_random() % max_delay;
182
183 im->tm_running=1;
184 if (!mod_timer(&im->timer, jiffies+tv+2))
185 atomic_inc(&im->refcnt);
186 }
187
188 static void igmp_gq_start_timer(struct in_device *in_dev)
189 {
190 int tv = net_random() % in_dev->mr_maxdelay;
191
192 in_dev->mr_gq_running = 1;
193 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
194 in_dev_hold(in_dev);
195 }
196
197 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
198 {
199 int tv = net_random() % delay;
200
201 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
202 in_dev_hold(in_dev);
203 }
204
205 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
206 {
207 spin_lock_bh(&im->lock);
208 im->unsolicit_count = 0;
209 if (del_timer(&im->timer)) {
210 if ((long)(im->timer.expires-jiffies) < max_delay) {
211 add_timer(&im->timer);
212 im->tm_running=1;
213 spin_unlock_bh(&im->lock);
214 return;
215 }
216 atomic_dec(&im->refcnt);
217 }
218 igmp_start_timer(im, max_delay);
219 spin_unlock_bh(&im->lock);
220 }
221
222
223 /*
224 * Send an IGMP report.
225 */
226
227 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
228
229
230 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
231 int gdeleted, int sdeleted)
232 {
233 switch (type) {
234 case IGMPV3_MODE_IS_INCLUDE:
235 case IGMPV3_MODE_IS_EXCLUDE:
236 if (gdeleted || sdeleted)
237 return 0;
238 if (!(pmc->gsquery && !psf->sf_gsresp)) {
239 if (pmc->sfmode == MCAST_INCLUDE)
240 return 1;
241 /* don't include if this source is excluded
242 * in all filters
243 */
244 if (psf->sf_count[MCAST_INCLUDE])
245 return type == IGMPV3_MODE_IS_INCLUDE;
246 return pmc->sfcount[MCAST_EXCLUDE] ==
247 psf->sf_count[MCAST_EXCLUDE];
248 }
249 return 0;
250 case IGMPV3_CHANGE_TO_INCLUDE:
251 if (gdeleted || sdeleted)
252 return 0;
253 return psf->sf_count[MCAST_INCLUDE] != 0;
254 case IGMPV3_CHANGE_TO_EXCLUDE:
255 if (gdeleted || sdeleted)
256 return 0;
257 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
258 psf->sf_count[MCAST_INCLUDE])
259 return 0;
260 return pmc->sfcount[MCAST_EXCLUDE] ==
261 psf->sf_count[MCAST_EXCLUDE];
262 case IGMPV3_ALLOW_NEW_SOURCES:
263 if (gdeleted || !psf->sf_crcount)
264 return 0;
265 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
266 case IGMPV3_BLOCK_OLD_SOURCES:
267 if (pmc->sfmode == MCAST_INCLUDE)
268 return gdeleted || (psf->sf_crcount && sdeleted);
269 return psf->sf_crcount && !gdeleted && !sdeleted;
270 }
271 return 0;
272 }
273
274 static int
275 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
276 {
277 struct ip_sf_list *psf;
278 int scount = 0;
279
280 for (psf=pmc->sources; psf; psf=psf->sf_next) {
281 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
282 continue;
283 scount++;
284 }
285 return scount;
286 }
287
288 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
289 {
290 struct sk_buff *skb;
291 struct rtable *rt;
292 struct iphdr *pip;
293 struct igmpv3_report *pig;
294
295 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
296 if (skb == NULL)
297 return NULL;
298
299 {
300 struct flowi fl = { .oif = dev->ifindex,
301 .nl_u = { .ip4_u = {
302 .daddr = IGMPV3_ALL_MCR } },
303 .proto = IPPROTO_IGMP };
304 if (ip_route_output_key(&init_net, &rt, &fl)) {
305 kfree_skb(skb);
306 return NULL;
307 }
308 }
309 if (rt->rt_src == 0) {
310 kfree_skb(skb);
311 ip_rt_put(rt);
312 return NULL;
313 }
314
315 skb->dst = &rt->u.dst;
316 skb->dev = dev;
317
318 skb_reserve(skb, LL_RESERVED_SPACE(dev));
319
320 skb_reset_network_header(skb);
321 pip = ip_hdr(skb);
322 skb_put(skb, sizeof(struct iphdr) + 4);
323
324 pip->version = 4;
325 pip->ihl = (sizeof(struct iphdr)+4)>>2;
326 pip->tos = 0xc0;
327 pip->frag_off = htons(IP_DF);
328 pip->ttl = 1;
329 pip->daddr = rt->rt_dst;
330 pip->saddr = rt->rt_src;
331 pip->protocol = IPPROTO_IGMP;
332 pip->tot_len = 0; /* filled in later */
333 ip_select_ident(pip, &rt->u.dst, NULL);
334 ((u8*)&pip[1])[0] = IPOPT_RA;
335 ((u8*)&pip[1])[1] = 4;
336 ((u8*)&pip[1])[2] = 0;
337 ((u8*)&pip[1])[3] = 0;
338
339 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
340 skb_put(skb, sizeof(*pig));
341 pig = igmpv3_report_hdr(skb);
342 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
343 pig->resv1 = 0;
344 pig->csum = 0;
345 pig->resv2 = 0;
346 pig->ngrec = 0;
347 return skb;
348 }
349
350 static int igmpv3_sendpack(struct sk_buff *skb)
351 {
352 struct igmphdr *pig = igmp_hdr(skb);
353 const int igmplen = skb->tail - skb->transport_header;
354
355 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
356
357 return ip_local_out(skb);
358 }
359
360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
361 {
362 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
363 }
364
365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
366 int type, struct igmpv3_grec **ppgr)
367 {
368 struct net_device *dev = pmc->interface->dev;
369 struct igmpv3_report *pih;
370 struct igmpv3_grec *pgr;
371
372 if (!skb)
373 skb = igmpv3_newpack(dev, dev->mtu);
374 if (!skb)
375 return NULL;
376 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
377 pgr->grec_type = type;
378 pgr->grec_auxwords = 0;
379 pgr->grec_nsrcs = 0;
380 pgr->grec_mca = pmc->multiaddr;
381 pih = igmpv3_report_hdr(skb);
382 pih->ngrec = htons(ntohs(pih->ngrec)+1);
383 *ppgr = pgr;
384 return skb;
385 }
386
387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
388 skb_tailroom(skb)) : 0)
389
390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
391 int type, int gdeleted, int sdeleted)
392 {
393 struct net_device *dev = pmc->interface->dev;
394 struct igmpv3_report *pih;
395 struct igmpv3_grec *pgr = NULL;
396 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
397 int scount, stotal, first, isquery, truncate;
398
399 if (pmc->multiaddr == IGMP_ALL_HOSTS)
400 return skb;
401
402 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
403 type == IGMPV3_MODE_IS_EXCLUDE;
404 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
405 type == IGMPV3_CHANGE_TO_EXCLUDE;
406
407 stotal = scount = 0;
408
409 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
410
411 if (!*psf_list)
412 goto empty_source;
413
414 pih = skb ? igmpv3_report_hdr(skb) : NULL;
415
416 /* EX and TO_EX get a fresh packet, if needed */
417 if (truncate) {
418 if (pih && pih->ngrec &&
419 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
420 if (skb)
421 igmpv3_sendpack(skb);
422 skb = igmpv3_newpack(dev, dev->mtu);
423 }
424 }
425 first = 1;
426 psf_prev = NULL;
427 for (psf=*psf_list; psf; psf=psf_next) {
428 __be32 *psrc;
429
430 psf_next = psf->sf_next;
431
432 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
433 psf_prev = psf;
434 continue;
435 }
436
437 /* clear marks on query responses */
438 if (isquery)
439 psf->sf_gsresp = 0;
440
441 if (AVAILABLE(skb) < sizeof(__be32) +
442 first*sizeof(struct igmpv3_grec)) {
443 if (truncate && !first)
444 break; /* truncate these */
445 if (pgr)
446 pgr->grec_nsrcs = htons(scount);
447 if (skb)
448 igmpv3_sendpack(skb);
449 skb = igmpv3_newpack(dev, dev->mtu);
450 first = 1;
451 scount = 0;
452 }
453 if (first) {
454 skb = add_grhead(skb, pmc, type, &pgr);
455 first = 0;
456 }
457 if (!skb)
458 return NULL;
459 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
460 *psrc = psf->sf_inaddr;
461 scount++; stotal++;
462 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
463 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
464 psf->sf_crcount--;
465 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
466 if (psf_prev)
467 psf_prev->sf_next = psf->sf_next;
468 else
469 *psf_list = psf->sf_next;
470 kfree(psf);
471 continue;
472 }
473 }
474 psf_prev = psf;
475 }
476
477 empty_source:
478 if (!stotal) {
479 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
480 type == IGMPV3_BLOCK_OLD_SOURCES)
481 return skb;
482 if (pmc->crcount || isquery) {
483 /* make sure we have room for group header */
484 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
485 igmpv3_sendpack(skb);
486 skb = NULL; /* add_grhead will get a new one */
487 }
488 skb = add_grhead(skb, pmc, type, &pgr);
489 }
490 }
491 if (pgr)
492 pgr->grec_nsrcs = htons(scount);
493
494 if (isquery)
495 pmc->gsquery = 0; /* clear query state on report */
496 return skb;
497 }
498
499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
500 {
501 struct sk_buff *skb = NULL;
502 int type;
503
504 if (!pmc) {
505 read_lock(&in_dev->mc_list_lock);
506 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
507 if (pmc->multiaddr == IGMP_ALL_HOSTS)
508 continue;
509 spin_lock_bh(&pmc->lock);
510 if (pmc->sfcount[MCAST_EXCLUDE])
511 type = IGMPV3_MODE_IS_EXCLUDE;
512 else
513 type = IGMPV3_MODE_IS_INCLUDE;
514 skb = add_grec(skb, pmc, type, 0, 0);
515 spin_unlock_bh(&pmc->lock);
516 }
517 read_unlock(&in_dev->mc_list_lock);
518 } else {
519 spin_lock_bh(&pmc->lock);
520 if (pmc->sfcount[MCAST_EXCLUDE])
521 type = IGMPV3_MODE_IS_EXCLUDE;
522 else
523 type = IGMPV3_MODE_IS_INCLUDE;
524 skb = add_grec(skb, pmc, type, 0, 0);
525 spin_unlock_bh(&pmc->lock);
526 }
527 if (!skb)
528 return 0;
529 return igmpv3_sendpack(skb);
530 }
531
532 /*
533 * remove zero-count source records from a source filter list
534 */
535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
536 {
537 struct ip_sf_list *psf_prev, *psf_next, *psf;
538
539 psf_prev = NULL;
540 for (psf=*ppsf; psf; psf = psf_next) {
541 psf_next = psf->sf_next;
542 if (psf->sf_crcount == 0) {
543 if (psf_prev)
544 psf_prev->sf_next = psf->sf_next;
545 else
546 *ppsf = psf->sf_next;
547 kfree(psf);
548 } else
549 psf_prev = psf;
550 }
551 }
552
553 static void igmpv3_send_cr(struct in_device *in_dev)
554 {
555 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
556 struct sk_buff *skb = NULL;
557 int type, dtype;
558
559 read_lock(&in_dev->mc_list_lock);
560 spin_lock_bh(&in_dev->mc_tomb_lock);
561
562 /* deleted MCA's */
563 pmc_prev = NULL;
564 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
565 pmc_next = pmc->next;
566 if (pmc->sfmode == MCAST_INCLUDE) {
567 type = IGMPV3_BLOCK_OLD_SOURCES;
568 dtype = IGMPV3_BLOCK_OLD_SOURCES;
569 skb = add_grec(skb, pmc, type, 1, 0);
570 skb = add_grec(skb, pmc, dtype, 1, 1);
571 }
572 if (pmc->crcount) {
573 if (pmc->sfmode == MCAST_EXCLUDE) {
574 type = IGMPV3_CHANGE_TO_INCLUDE;
575 skb = add_grec(skb, pmc, type, 1, 0);
576 }
577 pmc->crcount--;
578 if (pmc->crcount == 0) {
579 igmpv3_clear_zeros(&pmc->tomb);
580 igmpv3_clear_zeros(&pmc->sources);
581 }
582 }
583 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
584 if (pmc_prev)
585 pmc_prev->next = pmc_next;
586 else
587 in_dev->mc_tomb = pmc_next;
588 in_dev_put(pmc->interface);
589 kfree(pmc);
590 } else
591 pmc_prev = pmc;
592 }
593 spin_unlock_bh(&in_dev->mc_tomb_lock);
594
595 /* change recs */
596 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
597 spin_lock_bh(&pmc->lock);
598 if (pmc->sfcount[MCAST_EXCLUDE]) {
599 type = IGMPV3_BLOCK_OLD_SOURCES;
600 dtype = IGMPV3_ALLOW_NEW_SOURCES;
601 } else {
602 type = IGMPV3_ALLOW_NEW_SOURCES;
603 dtype = IGMPV3_BLOCK_OLD_SOURCES;
604 }
605 skb = add_grec(skb, pmc, type, 0, 0);
606 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
607
608 /* filter mode changes */
609 if (pmc->crcount) {
610 if (pmc->sfmode == MCAST_EXCLUDE)
611 type = IGMPV3_CHANGE_TO_EXCLUDE;
612 else
613 type = IGMPV3_CHANGE_TO_INCLUDE;
614 skb = add_grec(skb, pmc, type, 0, 0);
615 pmc->crcount--;
616 }
617 spin_unlock_bh(&pmc->lock);
618 }
619 read_unlock(&in_dev->mc_list_lock);
620
621 if (!skb)
622 return;
623 (void) igmpv3_sendpack(skb);
624 }
625
626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
627 int type)
628 {
629 struct sk_buff *skb;
630 struct iphdr *iph;
631 struct igmphdr *ih;
632 struct rtable *rt;
633 struct net_device *dev = in_dev->dev;
634 __be32 group = pmc ? pmc->multiaddr : 0;
635 __be32 dst;
636
637 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
638 return igmpv3_send_report(in_dev, pmc);
639 else if (type == IGMP_HOST_LEAVE_MESSAGE)
640 dst = IGMP_ALL_ROUTER;
641 else
642 dst = group;
643
644 {
645 struct flowi fl = { .oif = dev->ifindex,
646 .nl_u = { .ip4_u = { .daddr = dst } },
647 .proto = IPPROTO_IGMP };
648 if (ip_route_output_key(&init_net, &rt, &fl))
649 return -1;
650 }
651 if (rt->rt_src == 0) {
652 ip_rt_put(rt);
653 return -1;
654 }
655
656 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
657 if (skb == NULL) {
658 ip_rt_put(rt);
659 return -1;
660 }
661
662 skb->dst = &rt->u.dst;
663
664 skb_reserve(skb, LL_RESERVED_SPACE(dev));
665
666 skb_reset_network_header(skb);
667 iph = ip_hdr(skb);
668 skb_put(skb, sizeof(struct iphdr) + 4);
669
670 iph->version = 4;
671 iph->ihl = (sizeof(struct iphdr)+4)>>2;
672 iph->tos = 0xc0;
673 iph->frag_off = htons(IP_DF);
674 iph->ttl = 1;
675 iph->daddr = dst;
676 iph->saddr = rt->rt_src;
677 iph->protocol = IPPROTO_IGMP;
678 ip_select_ident(iph, &rt->u.dst, NULL);
679 ((u8*)&iph[1])[0] = IPOPT_RA;
680 ((u8*)&iph[1])[1] = 4;
681 ((u8*)&iph[1])[2] = 0;
682 ((u8*)&iph[1])[3] = 0;
683
684 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
685 ih->type=type;
686 ih->code=0;
687 ih->csum=0;
688 ih->group=group;
689 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
690
691 return ip_local_out(skb);
692 }
693
694 static void igmp_gq_timer_expire(unsigned long data)
695 {
696 struct in_device *in_dev = (struct in_device *)data;
697
698 in_dev->mr_gq_running = 0;
699 igmpv3_send_report(in_dev, NULL);
700 __in_dev_put(in_dev);
701 }
702
703 static void igmp_ifc_timer_expire(unsigned long data)
704 {
705 struct in_device *in_dev = (struct in_device *)data;
706
707 igmpv3_send_cr(in_dev);
708 if (in_dev->mr_ifc_count) {
709 in_dev->mr_ifc_count--;
710 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
711 }
712 __in_dev_put(in_dev);
713 }
714
715 static void igmp_ifc_event(struct in_device *in_dev)
716 {
717 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
718 return;
719 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
720 IGMP_Unsolicited_Report_Count;
721 igmp_ifc_start_timer(in_dev, 1);
722 }
723
724
725 static void igmp_timer_expire(unsigned long data)
726 {
727 struct ip_mc_list *im=(struct ip_mc_list *)data;
728 struct in_device *in_dev = im->interface;
729
730 spin_lock(&im->lock);
731 im->tm_running=0;
732
733 if (im->unsolicit_count) {
734 im->unsolicit_count--;
735 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
736 }
737 im->reporter = 1;
738 spin_unlock(&im->lock);
739
740 if (IGMP_V1_SEEN(in_dev))
741 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
742 else if (IGMP_V2_SEEN(in_dev))
743 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
744 else
745 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
746
747 ip_ma_put(im);
748 }
749
750 /* mark EXCLUDE-mode sources */
751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
752 {
753 struct ip_sf_list *psf;
754 int i, scount;
755
756 scount = 0;
757 for (psf=pmc->sources; psf; psf=psf->sf_next) {
758 if (scount == nsrcs)
759 break;
760 for (i=0; i<nsrcs; i++) {
761 /* skip inactive filters */
762 if (pmc->sfcount[MCAST_INCLUDE] ||
763 pmc->sfcount[MCAST_EXCLUDE] !=
764 psf->sf_count[MCAST_EXCLUDE])
765 continue;
766 if (srcs[i] == psf->sf_inaddr) {
767 scount++;
768 break;
769 }
770 }
771 }
772 pmc->gsquery = 0;
773 if (scount == nsrcs) /* all sources excluded */
774 return 0;
775 return 1;
776 }
777
778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
779 {
780 struct ip_sf_list *psf;
781 int i, scount;
782
783 if (pmc->sfmode == MCAST_EXCLUDE)
784 return igmp_xmarksources(pmc, nsrcs, srcs);
785
786 /* mark INCLUDE-mode sources */
787 scount = 0;
788 for (psf=pmc->sources; psf; psf=psf->sf_next) {
789 if (scount == nsrcs)
790 break;
791 for (i=0; i<nsrcs; i++)
792 if (srcs[i] == psf->sf_inaddr) {
793 psf->sf_gsresp = 1;
794 scount++;
795 break;
796 }
797 }
798 if (!scount) {
799 pmc->gsquery = 0;
800 return 0;
801 }
802 pmc->gsquery = 1;
803 return 1;
804 }
805
806 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
807 {
808 struct ip_mc_list *im;
809
810 /* Timers are only set for non-local groups */
811
812 if (group == IGMP_ALL_HOSTS)
813 return;
814
815 read_lock(&in_dev->mc_list_lock);
816 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
817 if (im->multiaddr == group) {
818 igmp_stop_timer(im);
819 break;
820 }
821 }
822 read_unlock(&in_dev->mc_list_lock);
823 }
824
825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
826 int len)
827 {
828 struct igmphdr *ih = igmp_hdr(skb);
829 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
830 struct ip_mc_list *im;
831 __be32 group = ih->group;
832 int max_delay;
833 int mark = 0;
834
835
836 if (len == 8) {
837 if (ih->code == 0) {
838 /* Alas, old v1 router presents here. */
839
840 max_delay = IGMP_Query_Response_Interval;
841 in_dev->mr_v1_seen = jiffies +
842 IGMP_V1_Router_Present_Timeout;
843 group = 0;
844 } else {
845 /* v2 router present */
846 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
847 in_dev->mr_v2_seen = jiffies +
848 IGMP_V2_Router_Present_Timeout;
849 }
850 /* cancel the interface change timer */
851 in_dev->mr_ifc_count = 0;
852 if (del_timer(&in_dev->mr_ifc_timer))
853 __in_dev_put(in_dev);
854 /* clear deleted report items */
855 igmpv3_clear_delrec(in_dev);
856 } else if (len < 12) {
857 return; /* ignore bogus packet; freed by caller */
858 } else { /* v3 */
859 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
860 return;
861
862 ih3 = igmpv3_query_hdr(skb);
863 if (ih3->nsrcs) {
864 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
865 + ntohs(ih3->nsrcs)*sizeof(__be32)))
866 return;
867 ih3 = igmpv3_query_hdr(skb);
868 }
869
870 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
871 if (!max_delay)
872 max_delay = 1; /* can't mod w/ 0 */
873 in_dev->mr_maxdelay = max_delay;
874 if (ih3->qrv)
875 in_dev->mr_qrv = ih3->qrv;
876 if (!group) { /* general query */
877 if (ih3->nsrcs)
878 return; /* no sources allowed */
879 igmp_gq_start_timer(in_dev);
880 return;
881 }
882 /* mark sources to include, if group & source-specific */
883 mark = ih3->nsrcs != 0;
884 }
885
886 /*
887 * - Start the timers in all of our membership records
888 * that the query applies to for the interface on
889 * which the query arrived excl. those that belong
890 * to a "local" group (224.0.0.X)
891 * - For timers already running check if they need to
892 * be reset.
893 * - Use the igmp->igmp_code field as the maximum
894 * delay possible
895 */
896 read_lock(&in_dev->mc_list_lock);
897 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
898 int changed;
899
900 if (group && group != im->multiaddr)
901 continue;
902 if (im->multiaddr == IGMP_ALL_HOSTS)
903 continue;
904 spin_lock_bh(&im->lock);
905 if (im->tm_running)
906 im->gsquery = im->gsquery && mark;
907 else
908 im->gsquery = mark;
909 changed = !im->gsquery ||
910 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
911 spin_unlock_bh(&im->lock);
912 if (changed)
913 igmp_mod_timer(im, max_delay);
914 }
915 read_unlock(&in_dev->mc_list_lock);
916 }
917
918 int igmp_rcv(struct sk_buff *skb)
919 {
920 /* This basically follows the spec line by line -- see RFC1112 */
921 struct igmphdr *ih;
922 struct in_device *in_dev = in_dev_get(skb->dev);
923 int len = skb->len;
924
925 if (in_dev == NULL)
926 goto drop;
927
928 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
929 goto drop_ref;
930
931 switch (skb->ip_summed) {
932 case CHECKSUM_COMPLETE:
933 if (!csum_fold(skb->csum))
934 break;
935 /* fall through */
936 case CHECKSUM_NONE:
937 skb->csum = 0;
938 if (__skb_checksum_complete(skb))
939 goto drop_ref;
940 }
941
942 ih = igmp_hdr(skb);
943 switch (ih->type) {
944 case IGMP_HOST_MEMBERSHIP_QUERY:
945 igmp_heard_query(in_dev, skb, len);
946 break;
947 case IGMP_HOST_MEMBERSHIP_REPORT:
948 case IGMPV2_HOST_MEMBERSHIP_REPORT:
949 case IGMPV3_HOST_MEMBERSHIP_REPORT:
950 /* Is it our report looped back? */
951 if (((struct rtable*)skb->dst)->fl.iif == 0)
952 break;
953 /* don't rely on MC router hearing unicast reports */
954 if (skb->pkt_type == PACKET_MULTICAST ||
955 skb->pkt_type == PACKET_BROADCAST)
956 igmp_heard_report(in_dev, ih->group);
957 break;
958 case IGMP_PIM:
959 #ifdef CONFIG_IP_PIMSM_V1
960 in_dev_put(in_dev);
961 return pim_rcv_v1(skb);
962 #endif
963 case IGMP_DVMRP:
964 case IGMP_TRACE:
965 case IGMP_HOST_LEAVE_MESSAGE:
966 case IGMP_MTRACE:
967 case IGMP_MTRACE_RESP:
968 break;
969 default:
970 break;
971 }
972
973 drop_ref:
974 in_dev_put(in_dev);
975 drop:
976 kfree_skb(skb);
977 return 0;
978 }
979
980 #endif
981
982
983 /*
984 * Add a filter to a device
985 */
986
987 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
988 {
989 char buf[MAX_ADDR_LEN];
990 struct net_device *dev = in_dev->dev;
991
992 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
993 We will get multicast token leakage, when IFF_MULTICAST
994 is changed. This check should be done in dev->set_multicast_list
995 routine. Something sort of:
996 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
997 --ANK
998 */
999 if (arp_mc_map(addr, buf, dev, 0) == 0)
1000 dev_mc_add(dev,buf,dev->addr_len,0);
1001 }
1002
1003 /*
1004 * Remove a filter from a device
1005 */
1006
1007 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1008 {
1009 char buf[MAX_ADDR_LEN];
1010 struct net_device *dev = in_dev->dev;
1011
1012 if (arp_mc_map(addr, buf, dev, 0) == 0)
1013 dev_mc_delete(dev,buf,dev->addr_len,0);
1014 }
1015
1016 #ifdef CONFIG_IP_MULTICAST
1017 /*
1018 * deleted ip_mc_list manipulation
1019 */
1020 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1021 {
1022 struct ip_mc_list *pmc;
1023
1024 /* this is an "ip_mc_list" for convenience; only the fields below
1025 * are actually used. In particular, the refcnt and users are not
1026 * used for management of the delete list. Using the same structure
1027 * for deleted items allows change reports to use common code with
1028 * non-deleted or query-response MCA's.
1029 */
1030 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1031 if (!pmc)
1032 return;
1033 spin_lock_bh(&im->lock);
1034 pmc->interface = im->interface;
1035 in_dev_hold(in_dev);
1036 pmc->multiaddr = im->multiaddr;
1037 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1038 IGMP_Unsolicited_Report_Count;
1039 pmc->sfmode = im->sfmode;
1040 if (pmc->sfmode == MCAST_INCLUDE) {
1041 struct ip_sf_list *psf;
1042
1043 pmc->tomb = im->tomb;
1044 pmc->sources = im->sources;
1045 im->tomb = im->sources = NULL;
1046 for (psf=pmc->sources; psf; psf=psf->sf_next)
1047 psf->sf_crcount = pmc->crcount;
1048 }
1049 spin_unlock_bh(&im->lock);
1050
1051 spin_lock_bh(&in_dev->mc_tomb_lock);
1052 pmc->next = in_dev->mc_tomb;
1053 in_dev->mc_tomb = pmc;
1054 spin_unlock_bh(&in_dev->mc_tomb_lock);
1055 }
1056
1057 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1058 {
1059 struct ip_mc_list *pmc, *pmc_prev;
1060 struct ip_sf_list *psf, *psf_next;
1061
1062 spin_lock_bh(&in_dev->mc_tomb_lock);
1063 pmc_prev = NULL;
1064 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1065 if (pmc->multiaddr == multiaddr)
1066 break;
1067 pmc_prev = pmc;
1068 }
1069 if (pmc) {
1070 if (pmc_prev)
1071 pmc_prev->next = pmc->next;
1072 else
1073 in_dev->mc_tomb = pmc->next;
1074 }
1075 spin_unlock_bh(&in_dev->mc_tomb_lock);
1076 if (pmc) {
1077 for (psf=pmc->tomb; psf; psf=psf_next) {
1078 psf_next = psf->sf_next;
1079 kfree(psf);
1080 }
1081 in_dev_put(pmc->interface);
1082 kfree(pmc);
1083 }
1084 }
1085
1086 static void igmpv3_clear_delrec(struct in_device *in_dev)
1087 {
1088 struct ip_mc_list *pmc, *nextpmc;
1089
1090 spin_lock_bh(&in_dev->mc_tomb_lock);
1091 pmc = in_dev->mc_tomb;
1092 in_dev->mc_tomb = NULL;
1093 spin_unlock_bh(&in_dev->mc_tomb_lock);
1094
1095 for (; pmc; pmc = nextpmc) {
1096 nextpmc = pmc->next;
1097 ip_mc_clear_src(pmc);
1098 in_dev_put(pmc->interface);
1099 kfree(pmc);
1100 }
1101 /* clear dead sources, too */
1102 read_lock(&in_dev->mc_list_lock);
1103 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1104 struct ip_sf_list *psf, *psf_next;
1105
1106 spin_lock_bh(&pmc->lock);
1107 psf = pmc->tomb;
1108 pmc->tomb = NULL;
1109 spin_unlock_bh(&pmc->lock);
1110 for (; psf; psf=psf_next) {
1111 psf_next = psf->sf_next;
1112 kfree(psf);
1113 }
1114 }
1115 read_unlock(&in_dev->mc_list_lock);
1116 }
1117 #endif
1118
1119 static void igmp_group_dropped(struct ip_mc_list *im)
1120 {
1121 struct in_device *in_dev = im->interface;
1122 #ifdef CONFIG_IP_MULTICAST
1123 int reporter;
1124 #endif
1125
1126 if (im->loaded) {
1127 im->loaded = 0;
1128 ip_mc_filter_del(in_dev, im->multiaddr);
1129 }
1130
1131 #ifdef CONFIG_IP_MULTICAST
1132 if (im->multiaddr == IGMP_ALL_HOSTS)
1133 return;
1134
1135 reporter = im->reporter;
1136 igmp_stop_timer(im);
1137
1138 if (!in_dev->dead) {
1139 if (IGMP_V1_SEEN(in_dev))
1140 goto done;
1141 if (IGMP_V2_SEEN(in_dev)) {
1142 if (reporter)
1143 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1144 goto done;
1145 }
1146 /* IGMPv3 */
1147 igmpv3_add_delrec(in_dev, im);
1148
1149 igmp_ifc_event(in_dev);
1150 }
1151 done:
1152 #endif
1153 ip_mc_clear_src(im);
1154 }
1155
1156 static void igmp_group_added(struct ip_mc_list *im)
1157 {
1158 struct in_device *in_dev = im->interface;
1159
1160 if (im->loaded == 0) {
1161 im->loaded = 1;
1162 ip_mc_filter_add(in_dev, im->multiaddr);
1163 }
1164
1165 #ifdef CONFIG_IP_MULTICAST
1166 if (im->multiaddr == IGMP_ALL_HOSTS)
1167 return;
1168
1169 if (in_dev->dead)
1170 return;
1171 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1172 spin_lock_bh(&im->lock);
1173 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1174 spin_unlock_bh(&im->lock);
1175 return;
1176 }
1177 /* else, v3 */
1178
1179 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1180 IGMP_Unsolicited_Report_Count;
1181 igmp_ifc_event(in_dev);
1182 #endif
1183 }
1184
1185
1186 /*
1187 * Multicast list managers
1188 */
1189
1190
1191 /*
1192 * A socket has joined a multicast group on device dev.
1193 */
1194
1195 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1196 {
1197 struct ip_mc_list *im;
1198
1199 ASSERT_RTNL();
1200
1201 for (im=in_dev->mc_list; im; im=im->next) {
1202 if (im->multiaddr == addr) {
1203 im->users++;
1204 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1205 goto out;
1206 }
1207 }
1208
1209 im = kmalloc(sizeof(*im), GFP_KERNEL);
1210 if (!im)
1211 goto out;
1212
1213 im->users=1;
1214 im->interface=in_dev;
1215 in_dev_hold(in_dev);
1216 im->multiaddr=addr;
1217 /* initial mode is (EX, empty) */
1218 im->sfmode = MCAST_EXCLUDE;
1219 im->sfcount[MCAST_INCLUDE] = 0;
1220 im->sfcount[MCAST_EXCLUDE] = 1;
1221 im->sources = NULL;
1222 im->tomb = NULL;
1223 im->crcount = 0;
1224 atomic_set(&im->refcnt, 1);
1225 spin_lock_init(&im->lock);
1226 #ifdef CONFIG_IP_MULTICAST
1227 im->tm_running=0;
1228 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1229 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1230 im->reporter = 0;
1231 im->gsquery = 0;
1232 #endif
1233 im->loaded = 0;
1234 write_lock_bh(&in_dev->mc_list_lock);
1235 im->next=in_dev->mc_list;
1236 in_dev->mc_list=im;
1237 write_unlock_bh(&in_dev->mc_list_lock);
1238 #ifdef CONFIG_IP_MULTICAST
1239 igmpv3_del_delrec(in_dev, im->multiaddr);
1240 #endif
1241 igmp_group_added(im);
1242 if (!in_dev->dead)
1243 ip_rt_multicast_event(in_dev);
1244 out:
1245 return;
1246 }
1247
1248 /*
1249 * Resend IGMP JOIN report; used for bonding.
1250 */
1251 void ip_mc_rejoin_group(struct ip_mc_list *im)
1252 {
1253 #ifdef CONFIG_IP_MULTICAST
1254 struct in_device *in_dev = im->interface;
1255
1256 if (im->multiaddr == IGMP_ALL_HOSTS)
1257 return;
1258
1259 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1260 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1261 return;
1262 }
1263 /* else, v3 */
1264 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1265 IGMP_Unsolicited_Report_Count;
1266 igmp_ifc_event(in_dev);
1267 #endif
1268 }
1269
1270 /*
1271 * A socket has left a multicast group on device dev
1272 */
1273
1274 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1275 {
1276 struct ip_mc_list *i, **ip;
1277
1278 ASSERT_RTNL();
1279
1280 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1281 if (i->multiaddr==addr) {
1282 if (--i->users == 0) {
1283 write_lock_bh(&in_dev->mc_list_lock);
1284 *ip = i->next;
1285 write_unlock_bh(&in_dev->mc_list_lock);
1286 igmp_group_dropped(i);
1287
1288 if (!in_dev->dead)
1289 ip_rt_multicast_event(in_dev);
1290
1291 ip_ma_put(i);
1292 return;
1293 }
1294 break;
1295 }
1296 }
1297 }
1298
1299 /* Device going down */
1300
1301 void ip_mc_down(struct in_device *in_dev)
1302 {
1303 struct ip_mc_list *i;
1304
1305 ASSERT_RTNL();
1306
1307 for (i=in_dev->mc_list; i; i=i->next)
1308 igmp_group_dropped(i);
1309
1310 #ifdef CONFIG_IP_MULTICAST
1311 in_dev->mr_ifc_count = 0;
1312 if (del_timer(&in_dev->mr_ifc_timer))
1313 __in_dev_put(in_dev);
1314 in_dev->mr_gq_running = 0;
1315 if (del_timer(&in_dev->mr_gq_timer))
1316 __in_dev_put(in_dev);
1317 igmpv3_clear_delrec(in_dev);
1318 #endif
1319
1320 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1321 }
1322
1323 void ip_mc_init_dev(struct in_device *in_dev)
1324 {
1325 ASSERT_RTNL();
1326
1327 in_dev->mc_tomb = NULL;
1328 #ifdef CONFIG_IP_MULTICAST
1329 in_dev->mr_gq_running = 0;
1330 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1331 (unsigned long)in_dev);
1332 in_dev->mr_ifc_count = 0;
1333 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1334 (unsigned long)in_dev);
1335 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1336 #endif
1337
1338 rwlock_init(&in_dev->mc_list_lock);
1339 spin_lock_init(&in_dev->mc_tomb_lock);
1340 }
1341
1342 /* Device going up */
1343
1344 void ip_mc_up(struct in_device *in_dev)
1345 {
1346 struct ip_mc_list *i;
1347
1348 ASSERT_RTNL();
1349
1350 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1351
1352 for (i=in_dev->mc_list; i; i=i->next)
1353 igmp_group_added(i);
1354 }
1355
1356 /*
1357 * Device is about to be destroyed: clean up.
1358 */
1359
1360 void ip_mc_destroy_dev(struct in_device *in_dev)
1361 {
1362 struct ip_mc_list *i;
1363
1364 ASSERT_RTNL();
1365
1366 /* Deactivate timers */
1367 ip_mc_down(in_dev);
1368
1369 write_lock_bh(&in_dev->mc_list_lock);
1370 while ((i = in_dev->mc_list) != NULL) {
1371 in_dev->mc_list = i->next;
1372 write_unlock_bh(&in_dev->mc_list_lock);
1373
1374 igmp_group_dropped(i);
1375 ip_ma_put(i);
1376
1377 write_lock_bh(&in_dev->mc_list_lock);
1378 }
1379 write_unlock_bh(&in_dev->mc_list_lock);
1380 }
1381
1382 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1383 {
1384 struct flowi fl = { .nl_u = { .ip4_u =
1385 { .daddr = imr->imr_multiaddr.s_addr } } };
1386 struct rtable *rt;
1387 struct net_device *dev = NULL;
1388 struct in_device *idev = NULL;
1389
1390 if (imr->imr_ifindex) {
1391 idev = inetdev_by_index(&init_net, imr->imr_ifindex);
1392 if (idev)
1393 __in_dev_put(idev);
1394 return idev;
1395 }
1396 if (imr->imr_address.s_addr) {
1397 dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
1398 if (!dev)
1399 return NULL;
1400 dev_put(dev);
1401 }
1402
1403 if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) {
1404 dev = rt->u.dst.dev;
1405 ip_rt_put(rt);
1406 }
1407 if (dev) {
1408 imr->imr_ifindex = dev->ifindex;
1409 idev = __in_dev_get_rtnl(dev);
1410 }
1411 return idev;
1412 }
1413
1414 /*
1415 * Join a socket to a group
1416 */
1417 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1418 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1419
1420
1421 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1422 __be32 *psfsrc)
1423 {
1424 struct ip_sf_list *psf, *psf_prev;
1425 int rv = 0;
1426
1427 psf_prev = NULL;
1428 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1429 if (psf->sf_inaddr == *psfsrc)
1430 break;
1431 psf_prev = psf;
1432 }
1433 if (!psf || psf->sf_count[sfmode] == 0) {
1434 /* source filter not found, or count wrong => bug */
1435 return -ESRCH;
1436 }
1437 psf->sf_count[sfmode]--;
1438 if (psf->sf_count[sfmode] == 0) {
1439 ip_rt_multicast_event(pmc->interface);
1440 }
1441 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1442 #ifdef CONFIG_IP_MULTICAST
1443 struct in_device *in_dev = pmc->interface;
1444 #endif
1445
1446 /* no more filters for this source */
1447 if (psf_prev)
1448 psf_prev->sf_next = psf->sf_next;
1449 else
1450 pmc->sources = psf->sf_next;
1451 #ifdef CONFIG_IP_MULTICAST
1452 if (psf->sf_oldin &&
1453 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1454 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1455 IGMP_Unsolicited_Report_Count;
1456 psf->sf_next = pmc->tomb;
1457 pmc->tomb = psf;
1458 rv = 1;
1459 } else
1460 #endif
1461 kfree(psf);
1462 }
1463 return rv;
1464 }
1465
1466 #ifndef CONFIG_IP_MULTICAST
1467 #define igmp_ifc_event(x) do { } while (0)
1468 #endif
1469
1470 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1471 int sfcount, __be32 *psfsrc, int delta)
1472 {
1473 struct ip_mc_list *pmc;
1474 int changerec = 0;
1475 int i, err;
1476
1477 if (!in_dev)
1478 return -ENODEV;
1479 read_lock(&in_dev->mc_list_lock);
1480 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1481 if (*pmca == pmc->multiaddr)
1482 break;
1483 }
1484 if (!pmc) {
1485 /* MCA not found?? bug */
1486 read_unlock(&in_dev->mc_list_lock);
1487 return -ESRCH;
1488 }
1489 spin_lock_bh(&pmc->lock);
1490 read_unlock(&in_dev->mc_list_lock);
1491 #ifdef CONFIG_IP_MULTICAST
1492 sf_markstate(pmc);
1493 #endif
1494 if (!delta) {
1495 err = -EINVAL;
1496 if (!pmc->sfcount[sfmode])
1497 goto out_unlock;
1498 pmc->sfcount[sfmode]--;
1499 }
1500 err = 0;
1501 for (i=0; i<sfcount; i++) {
1502 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1503
1504 changerec |= rv > 0;
1505 if (!err && rv < 0)
1506 err = rv;
1507 }
1508 if (pmc->sfmode == MCAST_EXCLUDE &&
1509 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1510 pmc->sfcount[MCAST_INCLUDE]) {
1511 #ifdef CONFIG_IP_MULTICAST
1512 struct ip_sf_list *psf;
1513 #endif
1514
1515 /* filter mode change */
1516 pmc->sfmode = MCAST_INCLUDE;
1517 #ifdef CONFIG_IP_MULTICAST
1518 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1519 IGMP_Unsolicited_Report_Count;
1520 in_dev->mr_ifc_count = pmc->crcount;
1521 for (psf=pmc->sources; psf; psf = psf->sf_next)
1522 psf->sf_crcount = 0;
1523 igmp_ifc_event(pmc->interface);
1524 } else if (sf_setstate(pmc) || changerec) {
1525 igmp_ifc_event(pmc->interface);
1526 #endif
1527 }
1528 out_unlock:
1529 spin_unlock_bh(&pmc->lock);
1530 return err;
1531 }
1532
1533 /*
1534 * Add multicast single-source filter to the interface list
1535 */
1536 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1537 __be32 *psfsrc, int delta)
1538 {
1539 struct ip_sf_list *psf, *psf_prev;
1540
1541 psf_prev = NULL;
1542 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1543 if (psf->sf_inaddr == *psfsrc)
1544 break;
1545 psf_prev = psf;
1546 }
1547 if (!psf) {
1548 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1549 if (!psf)
1550 return -ENOBUFS;
1551 psf->sf_inaddr = *psfsrc;
1552 if (psf_prev) {
1553 psf_prev->sf_next = psf;
1554 } else
1555 pmc->sources = psf;
1556 }
1557 psf->sf_count[sfmode]++;
1558 if (psf->sf_count[sfmode] == 1) {
1559 ip_rt_multicast_event(pmc->interface);
1560 }
1561 return 0;
1562 }
1563
1564 #ifdef CONFIG_IP_MULTICAST
1565 static void sf_markstate(struct ip_mc_list *pmc)
1566 {
1567 struct ip_sf_list *psf;
1568 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1569
1570 for (psf=pmc->sources; psf; psf=psf->sf_next)
1571 if (pmc->sfcount[MCAST_EXCLUDE]) {
1572 psf->sf_oldin = mca_xcount ==
1573 psf->sf_count[MCAST_EXCLUDE] &&
1574 !psf->sf_count[MCAST_INCLUDE];
1575 } else
1576 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1577 }
1578
1579 static int sf_setstate(struct ip_mc_list *pmc)
1580 {
1581 struct ip_sf_list *psf, *dpsf;
1582 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1583 int qrv = pmc->interface->mr_qrv;
1584 int new_in, rv;
1585
1586 rv = 0;
1587 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1588 if (pmc->sfcount[MCAST_EXCLUDE]) {
1589 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1590 !psf->sf_count[MCAST_INCLUDE];
1591 } else
1592 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1593 if (new_in) {
1594 if (!psf->sf_oldin) {
1595 struct ip_sf_list *prev = NULL;
1596
1597 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1598 if (dpsf->sf_inaddr == psf->sf_inaddr)
1599 break;
1600 prev = dpsf;
1601 }
1602 if (dpsf) {
1603 if (prev)
1604 prev->sf_next = dpsf->sf_next;
1605 else
1606 pmc->tomb = dpsf->sf_next;
1607 kfree(dpsf);
1608 }
1609 psf->sf_crcount = qrv;
1610 rv++;
1611 }
1612 } else if (psf->sf_oldin) {
1613
1614 psf->sf_crcount = 0;
1615 /*
1616 * add or update "delete" records if an active filter
1617 * is now inactive
1618 */
1619 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1620 if (dpsf->sf_inaddr == psf->sf_inaddr)
1621 break;
1622 if (!dpsf) {
1623 dpsf = (struct ip_sf_list *)
1624 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1625 if (!dpsf)
1626 continue;
1627 *dpsf = *psf;
1628 /* pmc->lock held by callers */
1629 dpsf->sf_next = pmc->tomb;
1630 pmc->tomb = dpsf;
1631 }
1632 dpsf->sf_crcount = qrv;
1633 rv++;
1634 }
1635 }
1636 return rv;
1637 }
1638 #endif
1639
1640 /*
1641 * Add multicast source filter list to the interface list
1642 */
1643 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1644 int sfcount, __be32 *psfsrc, int delta)
1645 {
1646 struct ip_mc_list *pmc;
1647 int isexclude;
1648 int i, err;
1649
1650 if (!in_dev)
1651 return -ENODEV;
1652 read_lock(&in_dev->mc_list_lock);
1653 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1654 if (*pmca == pmc->multiaddr)
1655 break;
1656 }
1657 if (!pmc) {
1658 /* MCA not found?? bug */
1659 read_unlock(&in_dev->mc_list_lock);
1660 return -ESRCH;
1661 }
1662 spin_lock_bh(&pmc->lock);
1663 read_unlock(&in_dev->mc_list_lock);
1664
1665 #ifdef CONFIG_IP_MULTICAST
1666 sf_markstate(pmc);
1667 #endif
1668 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1669 if (!delta)
1670 pmc->sfcount[sfmode]++;
1671 err = 0;
1672 for (i=0; i<sfcount; i++) {
1673 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1674 if (err)
1675 break;
1676 }
1677 if (err) {
1678 int j;
1679
1680 pmc->sfcount[sfmode]--;
1681 for (j=0; j<i; j++)
1682 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1683 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1684 #ifdef CONFIG_IP_MULTICAST
1685 struct ip_sf_list *psf;
1686 in_dev = pmc->interface;
1687 #endif
1688
1689 /* filter mode change */
1690 if (pmc->sfcount[MCAST_EXCLUDE])
1691 pmc->sfmode = MCAST_EXCLUDE;
1692 else if (pmc->sfcount[MCAST_INCLUDE])
1693 pmc->sfmode = MCAST_INCLUDE;
1694 #ifdef CONFIG_IP_MULTICAST
1695 /* else no filters; keep old mode for reports */
1696
1697 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1698 IGMP_Unsolicited_Report_Count;
1699 in_dev->mr_ifc_count = pmc->crcount;
1700 for (psf=pmc->sources; psf; psf = psf->sf_next)
1701 psf->sf_crcount = 0;
1702 igmp_ifc_event(in_dev);
1703 } else if (sf_setstate(pmc)) {
1704 igmp_ifc_event(in_dev);
1705 #endif
1706 }
1707 spin_unlock_bh(&pmc->lock);
1708 return err;
1709 }
1710
1711 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1712 {
1713 struct ip_sf_list *psf, *nextpsf;
1714
1715 for (psf=pmc->tomb; psf; psf=nextpsf) {
1716 nextpsf = psf->sf_next;
1717 kfree(psf);
1718 }
1719 pmc->tomb = NULL;
1720 for (psf=pmc->sources; psf; psf=nextpsf) {
1721 nextpsf = psf->sf_next;
1722 kfree(psf);
1723 }
1724 pmc->sources = NULL;
1725 pmc->sfmode = MCAST_EXCLUDE;
1726 pmc->sfcount[MCAST_INCLUDE] = 0;
1727 pmc->sfcount[MCAST_EXCLUDE] = 1;
1728 }
1729
1730
1731 /*
1732 * Join a multicast group
1733 */
1734 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1735 {
1736 int err;
1737 __be32 addr = imr->imr_multiaddr.s_addr;
1738 struct ip_mc_socklist *iml=NULL, *i;
1739 struct in_device *in_dev;
1740 struct inet_sock *inet = inet_sk(sk);
1741 int ifindex;
1742 int count = 0;
1743
1744 if (!ipv4_is_multicast(addr))
1745 return -EINVAL;
1746
1747 rtnl_lock();
1748
1749 in_dev = ip_mc_find_dev(imr);
1750
1751 if (!in_dev) {
1752 iml = NULL;
1753 err = -ENODEV;
1754 goto done;
1755 }
1756
1757 err = -EADDRINUSE;
1758 ifindex = imr->imr_ifindex;
1759 for (i = inet->mc_list; i; i = i->next) {
1760 if (i->multi.imr_multiaddr.s_addr == addr &&
1761 i->multi.imr_ifindex == ifindex)
1762 goto done;
1763 count++;
1764 }
1765 err = -ENOBUFS;
1766 if (count >= sysctl_igmp_max_memberships)
1767 goto done;
1768 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1769 if (iml == NULL)
1770 goto done;
1771
1772 memcpy(&iml->multi, imr, sizeof(*imr));
1773 iml->next = inet->mc_list;
1774 iml->sflist = NULL;
1775 iml->sfmode = MCAST_EXCLUDE;
1776 inet->mc_list = iml;
1777 ip_mc_inc_group(in_dev, addr);
1778 err = 0;
1779 done:
1780 rtnl_unlock();
1781 return err;
1782 }
1783
1784 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1785 struct in_device *in_dev)
1786 {
1787 int err;
1788
1789 if (iml->sflist == NULL) {
1790 /* any-source empty exclude case */
1791 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1792 iml->sfmode, 0, NULL, 0);
1793 }
1794 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1795 iml->sfmode, iml->sflist->sl_count,
1796 iml->sflist->sl_addr, 0);
1797 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1798 iml->sflist = NULL;
1799 return err;
1800 }
1801
1802 /*
1803 * Ask a socket to leave a group.
1804 */
1805
1806 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1807 {
1808 struct inet_sock *inet = inet_sk(sk);
1809 struct ip_mc_socklist *iml, **imlp;
1810 struct in_device *in_dev;
1811 __be32 group = imr->imr_multiaddr.s_addr;
1812 u32 ifindex;
1813 int ret = -EADDRNOTAVAIL;
1814
1815 rtnl_lock();
1816 in_dev = ip_mc_find_dev(imr);
1817 ifindex = imr->imr_ifindex;
1818 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1819 if (iml->multi.imr_multiaddr.s_addr != group)
1820 continue;
1821 if (ifindex) {
1822 if (iml->multi.imr_ifindex != ifindex)
1823 continue;
1824 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1825 iml->multi.imr_address.s_addr)
1826 continue;
1827
1828 (void) ip_mc_leave_src(sk, iml, in_dev);
1829
1830 *imlp = iml->next;
1831
1832 if (in_dev)
1833 ip_mc_dec_group(in_dev, group);
1834 rtnl_unlock();
1835 sock_kfree_s(sk, iml, sizeof(*iml));
1836 return 0;
1837 }
1838 if (!in_dev)
1839 ret = -ENODEV;
1840 rtnl_unlock();
1841 return ret;
1842 }
1843
1844 int ip_mc_source(int add, int omode, struct sock *sk, struct
1845 ip_mreq_source *mreqs, int ifindex)
1846 {
1847 int err;
1848 struct ip_mreqn imr;
1849 __be32 addr = mreqs->imr_multiaddr;
1850 struct ip_mc_socklist *pmc;
1851 struct in_device *in_dev = NULL;
1852 struct inet_sock *inet = inet_sk(sk);
1853 struct ip_sf_socklist *psl;
1854 int leavegroup = 0;
1855 int i, j, rv;
1856
1857 if (!ipv4_is_multicast(addr))
1858 return -EINVAL;
1859
1860 rtnl_lock();
1861
1862 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1863 imr.imr_address.s_addr = mreqs->imr_interface;
1864 imr.imr_ifindex = ifindex;
1865 in_dev = ip_mc_find_dev(&imr);
1866
1867 if (!in_dev) {
1868 err = -ENODEV;
1869 goto done;
1870 }
1871 err = -EADDRNOTAVAIL;
1872
1873 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1874 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1875 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1876 break;
1877 }
1878 if (!pmc) { /* must have a prior join */
1879 err = -EINVAL;
1880 goto done;
1881 }
1882 /* if a source filter was set, must be the same mode as before */
1883 if (pmc->sflist) {
1884 if (pmc->sfmode != omode) {
1885 err = -EINVAL;
1886 goto done;
1887 }
1888 } else if (pmc->sfmode != omode) {
1889 /* allow mode switches for empty-set filters */
1890 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1891 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1892 NULL, 0);
1893 pmc->sfmode = omode;
1894 }
1895
1896 psl = pmc->sflist;
1897 if (!add) {
1898 if (!psl)
1899 goto done; /* err = -EADDRNOTAVAIL */
1900 rv = !0;
1901 for (i=0; i<psl->sl_count; i++) {
1902 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1903 sizeof(__be32));
1904 if (rv == 0)
1905 break;
1906 }
1907 if (rv) /* source not found */
1908 goto done; /* err = -EADDRNOTAVAIL */
1909
1910 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1911 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1912 leavegroup = 1;
1913 goto done;
1914 }
1915
1916 /* update the interface filter */
1917 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1918 &mreqs->imr_sourceaddr, 1);
1919
1920 for (j=i+1; j<psl->sl_count; j++)
1921 psl->sl_addr[j-1] = psl->sl_addr[j];
1922 psl->sl_count--;
1923 err = 0;
1924 goto done;
1925 }
1926 /* else, add a new source to the filter */
1927
1928 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1929 err = -ENOBUFS;
1930 goto done;
1931 }
1932 if (!psl || psl->sl_count == psl->sl_max) {
1933 struct ip_sf_socklist *newpsl;
1934 int count = IP_SFBLOCK;
1935
1936 if (psl)
1937 count += psl->sl_max;
1938 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1939 if (!newpsl) {
1940 err = -ENOBUFS;
1941 goto done;
1942 }
1943 newpsl->sl_max = count;
1944 newpsl->sl_count = count - IP_SFBLOCK;
1945 if (psl) {
1946 for (i=0; i<psl->sl_count; i++)
1947 newpsl->sl_addr[i] = psl->sl_addr[i];
1948 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1949 }
1950 pmc->sflist = psl = newpsl;
1951 }
1952 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1953 for (i=0; i<psl->sl_count; i++) {
1954 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1955 sizeof(__be32));
1956 if (rv == 0)
1957 break;
1958 }
1959 if (rv == 0) /* address already there is an error */
1960 goto done;
1961 for (j=psl->sl_count-1; j>=i; j--)
1962 psl->sl_addr[j+1] = psl->sl_addr[j];
1963 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1964 psl->sl_count++;
1965 err = 0;
1966 /* update the interface list */
1967 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1968 &mreqs->imr_sourceaddr, 1);
1969 done:
1970 rtnl_unlock();
1971 if (leavegroup)
1972 return ip_mc_leave_group(sk, &imr);
1973 return err;
1974 }
1975
1976 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1977 {
1978 int err = 0;
1979 struct ip_mreqn imr;
1980 __be32 addr = msf->imsf_multiaddr;
1981 struct ip_mc_socklist *pmc;
1982 struct in_device *in_dev;
1983 struct inet_sock *inet = inet_sk(sk);
1984 struct ip_sf_socklist *newpsl, *psl;
1985 int leavegroup = 0;
1986
1987 if (!ipv4_is_multicast(addr))
1988 return -EINVAL;
1989 if (msf->imsf_fmode != MCAST_INCLUDE &&
1990 msf->imsf_fmode != MCAST_EXCLUDE)
1991 return -EINVAL;
1992
1993 rtnl_lock();
1994
1995 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1996 imr.imr_address.s_addr = msf->imsf_interface;
1997 imr.imr_ifindex = ifindex;
1998 in_dev = ip_mc_find_dev(&imr);
1999
2000 if (!in_dev) {
2001 err = -ENODEV;
2002 goto done;
2003 }
2004
2005 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2006 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2007 leavegroup = 1;
2008 goto done;
2009 }
2010
2011 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2012 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2013 pmc->multi.imr_ifindex == imr.imr_ifindex)
2014 break;
2015 }
2016 if (!pmc) { /* must have a prior join */
2017 err = -EINVAL;
2018 goto done;
2019 }
2020 if (msf->imsf_numsrc) {
2021 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2022 GFP_KERNEL);
2023 if (!newpsl) {
2024 err = -ENOBUFS;
2025 goto done;
2026 }
2027 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2028 memcpy(newpsl->sl_addr, msf->imsf_slist,
2029 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2030 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2031 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2032 if (err) {
2033 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2034 goto done;
2035 }
2036 } else {
2037 newpsl = NULL;
2038 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2039 msf->imsf_fmode, 0, NULL, 0);
2040 }
2041 psl = pmc->sflist;
2042 if (psl) {
2043 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2044 psl->sl_count, psl->sl_addr, 0);
2045 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2046 } else
2047 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2048 0, NULL, 0);
2049 pmc->sflist = newpsl;
2050 pmc->sfmode = msf->imsf_fmode;
2051 err = 0;
2052 done:
2053 rtnl_unlock();
2054 if (leavegroup)
2055 err = ip_mc_leave_group(sk, &imr);
2056 return err;
2057 }
2058
2059 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2060 struct ip_msfilter __user *optval, int __user *optlen)
2061 {
2062 int err, len, count, copycount;
2063 struct ip_mreqn imr;
2064 __be32 addr = msf->imsf_multiaddr;
2065 struct ip_mc_socklist *pmc;
2066 struct in_device *in_dev;
2067 struct inet_sock *inet = inet_sk(sk);
2068 struct ip_sf_socklist *psl;
2069
2070 if (!ipv4_is_multicast(addr))
2071 return -EINVAL;
2072
2073 rtnl_lock();
2074
2075 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2076 imr.imr_address.s_addr = msf->imsf_interface;
2077 imr.imr_ifindex = 0;
2078 in_dev = ip_mc_find_dev(&imr);
2079
2080 if (!in_dev) {
2081 err = -ENODEV;
2082 goto done;
2083 }
2084 err = -EADDRNOTAVAIL;
2085
2086 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2087 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2088 pmc->multi.imr_ifindex == imr.imr_ifindex)
2089 break;
2090 }
2091 if (!pmc) /* must have a prior join */
2092 goto done;
2093 msf->imsf_fmode = pmc->sfmode;
2094 psl = pmc->sflist;
2095 rtnl_unlock();
2096 if (!psl) {
2097 len = 0;
2098 count = 0;
2099 } else {
2100 count = psl->sl_count;
2101 }
2102 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2103 len = copycount * sizeof(psl->sl_addr[0]);
2104 msf->imsf_numsrc = count;
2105 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2106 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2107 return -EFAULT;
2108 }
2109 if (len &&
2110 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2111 return -EFAULT;
2112 return 0;
2113 done:
2114 rtnl_unlock();
2115 return err;
2116 }
2117
2118 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2119 struct group_filter __user *optval, int __user *optlen)
2120 {
2121 int err, i, count, copycount;
2122 struct sockaddr_in *psin;
2123 __be32 addr;
2124 struct ip_mc_socklist *pmc;
2125 struct inet_sock *inet = inet_sk(sk);
2126 struct ip_sf_socklist *psl;
2127
2128 psin = (struct sockaddr_in *)&gsf->gf_group;
2129 if (psin->sin_family != AF_INET)
2130 return -EINVAL;
2131 addr = psin->sin_addr.s_addr;
2132 if (!ipv4_is_multicast(addr))
2133 return -EINVAL;
2134
2135 rtnl_lock();
2136
2137 err = -EADDRNOTAVAIL;
2138
2139 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2140 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2141 pmc->multi.imr_ifindex == gsf->gf_interface)
2142 break;
2143 }
2144 if (!pmc) /* must have a prior join */
2145 goto done;
2146 gsf->gf_fmode = pmc->sfmode;
2147 psl = pmc->sflist;
2148 rtnl_unlock();
2149 count = psl ? psl->sl_count : 0;
2150 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2151 gsf->gf_numsrc = count;
2152 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2153 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2154 return -EFAULT;
2155 }
2156 for (i=0; i<copycount; i++) {
2157 struct sockaddr_storage ss;
2158
2159 psin = (struct sockaddr_in *)&ss;
2160 memset(&ss, 0, sizeof(ss));
2161 psin->sin_family = AF_INET;
2162 psin->sin_addr.s_addr = psl->sl_addr[i];
2163 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2164 return -EFAULT;
2165 }
2166 return 0;
2167 done:
2168 rtnl_unlock();
2169 return err;
2170 }
2171
2172 /*
2173 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2174 */
2175 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2176 {
2177 struct inet_sock *inet = inet_sk(sk);
2178 struct ip_mc_socklist *pmc;
2179 struct ip_sf_socklist *psl;
2180 int i;
2181
2182 if (!ipv4_is_multicast(loc_addr))
2183 return 1;
2184
2185 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2186 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2187 pmc->multi.imr_ifindex == dif)
2188 break;
2189 }
2190 if (!pmc)
2191 return 1;
2192 psl = pmc->sflist;
2193 if (!psl)
2194 return pmc->sfmode == MCAST_EXCLUDE;
2195
2196 for (i=0; i<psl->sl_count; i++) {
2197 if (psl->sl_addr[i] == rmt_addr)
2198 break;
2199 }
2200 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2201 return 0;
2202 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2203 return 0;
2204 return 1;
2205 }
2206
2207 /*
2208 * A socket is closing.
2209 */
2210
2211 void ip_mc_drop_socket(struct sock *sk)
2212 {
2213 struct inet_sock *inet = inet_sk(sk);
2214 struct ip_mc_socklist *iml;
2215
2216 if (inet->mc_list == NULL)
2217 return;
2218
2219 rtnl_lock();
2220 while ((iml = inet->mc_list) != NULL) {
2221 struct in_device *in_dev;
2222 inet->mc_list = iml->next;
2223
2224 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex);
2225 (void) ip_mc_leave_src(sk, iml, in_dev);
2226 if (in_dev != NULL) {
2227 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2228 in_dev_put(in_dev);
2229 }
2230 sock_kfree_s(sk, iml, sizeof(*iml));
2231 }
2232 rtnl_unlock();
2233 }
2234
2235 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2236 {
2237 struct ip_mc_list *im;
2238 struct ip_sf_list *psf;
2239 int rv = 0;
2240
2241 read_lock(&in_dev->mc_list_lock);
2242 for (im=in_dev->mc_list; im; im=im->next) {
2243 if (im->multiaddr == mc_addr)
2244 break;
2245 }
2246 if (im && proto == IPPROTO_IGMP) {
2247 rv = 1;
2248 } else if (im) {
2249 if (src_addr) {
2250 for (psf=im->sources; psf; psf=psf->sf_next) {
2251 if (psf->sf_inaddr == src_addr)
2252 break;
2253 }
2254 if (psf)
2255 rv = psf->sf_count[MCAST_INCLUDE] ||
2256 psf->sf_count[MCAST_EXCLUDE] !=
2257 im->sfcount[MCAST_EXCLUDE];
2258 else
2259 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2260 } else
2261 rv = 1; /* unspecified source; tentatively allow */
2262 }
2263 read_unlock(&in_dev->mc_list_lock);
2264 return rv;
2265 }
2266
2267 #if defined(CONFIG_PROC_FS)
2268 struct igmp_mc_iter_state {
2269 struct net_device *dev;
2270 struct in_device *in_dev;
2271 };
2272
2273 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2274
2275 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2276 {
2277 struct ip_mc_list *im = NULL;
2278 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2279
2280 state->in_dev = NULL;
2281 for_each_netdev(&init_net, state->dev) {
2282 struct in_device *in_dev;
2283 in_dev = in_dev_get(state->dev);
2284 if (!in_dev)
2285 continue;
2286 read_lock(&in_dev->mc_list_lock);
2287 im = in_dev->mc_list;
2288 if (im) {
2289 state->in_dev = in_dev;
2290 break;
2291 }
2292 read_unlock(&in_dev->mc_list_lock);
2293 in_dev_put(in_dev);
2294 }
2295 return im;
2296 }
2297
2298 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2299 {
2300 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2301 im = im->next;
2302 while (!im) {
2303 if (likely(state->in_dev != NULL)) {
2304 read_unlock(&state->in_dev->mc_list_lock);
2305 in_dev_put(state->in_dev);
2306 }
2307 state->dev = next_net_device(state->dev);
2308 if (!state->dev) {
2309 state->in_dev = NULL;
2310 break;
2311 }
2312 state->in_dev = in_dev_get(state->dev);
2313 if (!state->in_dev)
2314 continue;
2315 read_lock(&state->in_dev->mc_list_lock);
2316 im = state->in_dev->mc_list;
2317 }
2318 return im;
2319 }
2320
2321 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2322 {
2323 struct ip_mc_list *im = igmp_mc_get_first(seq);
2324 if (im)
2325 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2326 --pos;
2327 return pos ? NULL : im;
2328 }
2329
2330 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2331 __acquires(dev_base_lock)
2332 {
2333 read_lock(&dev_base_lock);
2334 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2335 }
2336
2337 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2338 {
2339 struct ip_mc_list *im;
2340 if (v == SEQ_START_TOKEN)
2341 im = igmp_mc_get_first(seq);
2342 else
2343 im = igmp_mc_get_next(seq, v);
2344 ++*pos;
2345 return im;
2346 }
2347
2348 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2349 __releases(dev_base_lock)
2350 {
2351 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2352 if (likely(state->in_dev != NULL)) {
2353 read_unlock(&state->in_dev->mc_list_lock);
2354 in_dev_put(state->in_dev);
2355 state->in_dev = NULL;
2356 }
2357 state->dev = NULL;
2358 read_unlock(&dev_base_lock);
2359 }
2360
2361 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2362 {
2363 if (v == SEQ_START_TOKEN)
2364 seq_puts(seq,
2365 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2366 else {
2367 struct ip_mc_list *im = (struct ip_mc_list *)v;
2368 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2369 char *querier;
2370 #ifdef CONFIG_IP_MULTICAST
2371 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2372 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2373 "V3";
2374 #else
2375 querier = "NONE";
2376 #endif
2377
2378 if (state->in_dev->mc_list == im) {
2379 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2380 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2381 }
2382
2383 seq_printf(seq,
2384 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2385 im->multiaddr, im->users,
2386 im->tm_running, im->tm_running ?
2387 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2388 im->reporter);
2389 }
2390 return 0;
2391 }
2392
2393 static const struct seq_operations igmp_mc_seq_ops = {
2394 .start = igmp_mc_seq_start,
2395 .next = igmp_mc_seq_next,
2396 .stop = igmp_mc_seq_stop,
2397 .show = igmp_mc_seq_show,
2398 };
2399
2400 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2401 {
2402 return seq_open_private(file, &igmp_mc_seq_ops,
2403 sizeof(struct igmp_mc_iter_state));
2404 }
2405
2406 static const struct file_operations igmp_mc_seq_fops = {
2407 .owner = THIS_MODULE,
2408 .open = igmp_mc_seq_open,
2409 .read = seq_read,
2410 .llseek = seq_lseek,
2411 .release = seq_release_private,
2412 };
2413
2414 struct igmp_mcf_iter_state {
2415 struct net_device *dev;
2416 struct in_device *idev;
2417 struct ip_mc_list *im;
2418 };
2419
2420 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2421
2422 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2423 {
2424 struct ip_sf_list *psf = NULL;
2425 struct ip_mc_list *im = NULL;
2426 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2427
2428 state->idev = NULL;
2429 state->im = NULL;
2430 for_each_netdev(&init_net, state->dev) {
2431 struct in_device *idev;
2432 idev = in_dev_get(state->dev);
2433 if (unlikely(idev == NULL))
2434 continue;
2435 read_lock(&idev->mc_list_lock);
2436 im = idev->mc_list;
2437 if (likely(im != NULL)) {
2438 spin_lock_bh(&im->lock);
2439 psf = im->sources;
2440 if (likely(psf != NULL)) {
2441 state->im = im;
2442 state->idev = idev;
2443 break;
2444 }
2445 spin_unlock_bh(&im->lock);
2446 }
2447 read_unlock(&idev->mc_list_lock);
2448 in_dev_put(idev);
2449 }
2450 return psf;
2451 }
2452
2453 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2454 {
2455 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2456
2457 psf = psf->sf_next;
2458 while (!psf) {
2459 spin_unlock_bh(&state->im->lock);
2460 state->im = state->im->next;
2461 while (!state->im) {
2462 if (likely(state->idev != NULL)) {
2463 read_unlock(&state->idev->mc_list_lock);
2464 in_dev_put(state->idev);
2465 }
2466 state->dev = next_net_device(state->dev);
2467 if (!state->dev) {
2468 state->idev = NULL;
2469 goto out;
2470 }
2471 state->idev = in_dev_get(state->dev);
2472 if (!state->idev)
2473 continue;
2474 read_lock(&state->idev->mc_list_lock);
2475 state->im = state->idev->mc_list;
2476 }
2477 if (!state->im)
2478 break;
2479 spin_lock_bh(&state->im->lock);
2480 psf = state->im->sources;
2481 }
2482 out:
2483 return psf;
2484 }
2485
2486 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2487 {
2488 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2489 if (psf)
2490 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2491 --pos;
2492 return pos ? NULL : psf;
2493 }
2494
2495 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2496 {
2497 read_lock(&dev_base_lock);
2498 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2499 }
2500
2501 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2502 {
2503 struct ip_sf_list *psf;
2504 if (v == SEQ_START_TOKEN)
2505 psf = igmp_mcf_get_first(seq);
2506 else
2507 psf = igmp_mcf_get_next(seq, v);
2508 ++*pos;
2509 return psf;
2510 }
2511
2512 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2513 {
2514 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2515 if (likely(state->im != NULL)) {
2516 spin_unlock_bh(&state->im->lock);
2517 state->im = NULL;
2518 }
2519 if (likely(state->idev != NULL)) {
2520 read_unlock(&state->idev->mc_list_lock);
2521 in_dev_put(state->idev);
2522 state->idev = NULL;
2523 }
2524 state->dev = NULL;
2525 read_unlock(&dev_base_lock);
2526 }
2527
2528 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2529 {
2530 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2531 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2532
2533 if (v == SEQ_START_TOKEN) {
2534 seq_printf(seq,
2535 "%3s %6s "
2536 "%10s %10s %6s %6s\n", "Idx",
2537 "Device", "MCA",
2538 "SRC", "INC", "EXC");
2539 } else {
2540 seq_printf(seq,
2541 "%3d %6.6s 0x%08x "
2542 "0x%08x %6lu %6lu\n",
2543 state->dev->ifindex, state->dev->name,
2544 ntohl(state->im->multiaddr),
2545 ntohl(psf->sf_inaddr),
2546 psf->sf_count[MCAST_INCLUDE],
2547 psf->sf_count[MCAST_EXCLUDE]);
2548 }
2549 return 0;
2550 }
2551
2552 static const struct seq_operations igmp_mcf_seq_ops = {
2553 .start = igmp_mcf_seq_start,
2554 .next = igmp_mcf_seq_next,
2555 .stop = igmp_mcf_seq_stop,
2556 .show = igmp_mcf_seq_show,
2557 };
2558
2559 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2560 {
2561 return seq_open_private(file, &igmp_mcf_seq_ops,
2562 sizeof(struct igmp_mcf_iter_state));
2563 }
2564
2565 static const struct file_operations igmp_mcf_seq_fops = {
2566 .owner = THIS_MODULE,
2567 .open = igmp_mcf_seq_open,
2568 .read = seq_read,
2569 .llseek = seq_lseek,
2570 .release = seq_release_private,
2571 };
2572
2573 int __init igmp_mc_proc_init(void)
2574 {
2575 proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2576 proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2577 return 0;
2578 }
2579 #endif
2580
2581 EXPORT_SYMBOL(ip_mc_dec_group);
2582 EXPORT_SYMBOL(ip_mc_inc_group);
2583 EXPORT_SYMBOL(ip_mc_join_group);
2584 EXPORT_SYMBOL(ip_mc_rejoin_group);
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