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[IPV4]: route: fix crash ip_route_input
[linux-2.6/sactl.git] / net / ipv4 / igmp.c
blob994648be80ab7e3e4a60abdb3e1a28e4aae290ca
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 kfree_skb(skb);
927 return 0;
928 }
929
930 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
931 goto drop;
932
933 switch (skb->ip_summed) {
934 case CHECKSUM_COMPLETE:
935 if (!csum_fold(skb->csum))
936 break;
937 /* fall through */
938 case CHECKSUM_NONE:
939 skb->csum = 0;
940 if (__skb_checksum_complete(skb))
941 goto drop;
942 }
943
944 ih = igmp_hdr(skb);
945 switch (ih->type) {
946 case IGMP_HOST_MEMBERSHIP_QUERY:
947 igmp_heard_query(in_dev, skb, len);
948 break;
949 case IGMP_HOST_MEMBERSHIP_REPORT:
950 case IGMPV2_HOST_MEMBERSHIP_REPORT:
951 case IGMPV3_HOST_MEMBERSHIP_REPORT:
952 /* Is it our report looped back? */
953 if (((struct rtable*)skb->dst)->fl.iif == 0)
954 break;
955 /* don't rely on MC router hearing unicast reports */
956 if (skb->pkt_type == PACKET_MULTICAST ||
957 skb->pkt_type == PACKET_BROADCAST)
958 igmp_heard_report(in_dev, ih->group);
959 break;
960 case IGMP_PIM:
961 #ifdef CONFIG_IP_PIMSM_V1
962 in_dev_put(in_dev);
963 return pim_rcv_v1(skb);
964 #endif
965 case IGMP_DVMRP:
966 case IGMP_TRACE:
967 case IGMP_HOST_LEAVE_MESSAGE:
968 case IGMP_MTRACE:
969 case IGMP_MTRACE_RESP:
970 break;
971 default:
972 break;
973 }
974
975 drop:
976 in_dev_put(in_dev);
977 kfree_skb(skb);
978 return 0;
979 }
980
981 #endif
982
983
984 /*
985 * Add a filter to a device
986 */
987
988 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
989 {
990 char buf[MAX_ADDR_LEN];
991 struct net_device *dev = in_dev->dev;
992
993 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
994 We will get multicast token leakage, when IFF_MULTICAST
995 is changed. This check should be done in dev->set_multicast_list
996 routine. Something sort of:
997 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
998 --ANK
999 */
1000 if (arp_mc_map(addr, buf, dev, 0) == 0)
1001 dev_mc_add(dev,buf,dev->addr_len,0);
1002 }
1003
1004 /*
1005 * Remove a filter from a device
1006 */
1007
1008 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1009 {
1010 char buf[MAX_ADDR_LEN];
1011 struct net_device *dev = in_dev->dev;
1012
1013 if (arp_mc_map(addr, buf, dev, 0) == 0)
1014 dev_mc_delete(dev,buf,dev->addr_len,0);
1015 }
1016
1017 #ifdef CONFIG_IP_MULTICAST
1018 /*
1019 * deleted ip_mc_list manipulation
1020 */
1021 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1022 {
1023 struct ip_mc_list *pmc;
1024
1025 /* this is an "ip_mc_list" for convenience; only the fields below
1026 * are actually used. In particular, the refcnt and users are not
1027 * used for management of the delete list. Using the same structure
1028 * for deleted items allows change reports to use common code with
1029 * non-deleted or query-response MCA's.
1030 */
1031 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1032 if (!pmc)
1033 return;
1034 spin_lock_bh(&im->lock);
1035 pmc->interface = im->interface;
1036 in_dev_hold(in_dev);
1037 pmc->multiaddr = im->multiaddr;
1038 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1039 IGMP_Unsolicited_Report_Count;
1040 pmc->sfmode = im->sfmode;
1041 if (pmc->sfmode == MCAST_INCLUDE) {
1042 struct ip_sf_list *psf;
1043
1044 pmc->tomb = im->tomb;
1045 pmc->sources = im->sources;
1046 im->tomb = im->sources = NULL;
1047 for (psf=pmc->sources; psf; psf=psf->sf_next)
1048 psf->sf_crcount = pmc->crcount;
1049 }
1050 spin_unlock_bh(&im->lock);
1051
1052 spin_lock_bh(&in_dev->mc_tomb_lock);
1053 pmc->next = in_dev->mc_tomb;
1054 in_dev->mc_tomb = pmc;
1055 spin_unlock_bh(&in_dev->mc_tomb_lock);
1056 }
1057
1058 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1059 {
1060 struct ip_mc_list *pmc, *pmc_prev;
1061 struct ip_sf_list *psf, *psf_next;
1062
1063 spin_lock_bh(&in_dev->mc_tomb_lock);
1064 pmc_prev = NULL;
1065 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1066 if (pmc->multiaddr == multiaddr)
1067 break;
1068 pmc_prev = pmc;
1069 }
1070 if (pmc) {
1071 if (pmc_prev)
1072 pmc_prev->next = pmc->next;
1073 else
1074 in_dev->mc_tomb = pmc->next;
1075 }
1076 spin_unlock_bh(&in_dev->mc_tomb_lock);
1077 if (pmc) {
1078 for (psf=pmc->tomb; psf; psf=psf_next) {
1079 psf_next = psf->sf_next;
1080 kfree(psf);
1081 }
1082 in_dev_put(pmc->interface);
1083 kfree(pmc);
1084 }
1085 }
1086
1087 static void igmpv3_clear_delrec(struct in_device *in_dev)
1088 {
1089 struct ip_mc_list *pmc, *nextpmc;
1090
1091 spin_lock_bh(&in_dev->mc_tomb_lock);
1092 pmc = in_dev->mc_tomb;
1093 in_dev->mc_tomb = NULL;
1094 spin_unlock_bh(&in_dev->mc_tomb_lock);
1095
1096 for (; pmc; pmc = nextpmc) {
1097 nextpmc = pmc->next;
1098 ip_mc_clear_src(pmc);
1099 in_dev_put(pmc->interface);
1100 kfree(pmc);
1101 }
1102 /* clear dead sources, too */
1103 read_lock(&in_dev->mc_list_lock);
1104 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1105 struct ip_sf_list *psf, *psf_next;
1106
1107 spin_lock_bh(&pmc->lock);
1108 psf = pmc->tomb;
1109 pmc->tomb = NULL;
1110 spin_unlock_bh(&pmc->lock);
1111 for (; psf; psf=psf_next) {
1112 psf_next = psf->sf_next;
1113 kfree(psf);
1114 }
1115 }
1116 read_unlock(&in_dev->mc_list_lock);
1117 }
1118 #endif
1119
1120 static void igmp_group_dropped(struct ip_mc_list *im)
1121 {
1122 struct in_device *in_dev = im->interface;
1123 #ifdef CONFIG_IP_MULTICAST
1124 int reporter;
1125 #endif
1126
1127 if (im->loaded) {
1128 im->loaded = 0;
1129 ip_mc_filter_del(in_dev, im->multiaddr);
1130 }
1131
1132 #ifdef CONFIG_IP_MULTICAST
1133 if (im->multiaddr == IGMP_ALL_HOSTS)
1134 return;
1135
1136 reporter = im->reporter;
1137 igmp_stop_timer(im);
1138
1139 if (!in_dev->dead) {
1140 if (IGMP_V1_SEEN(in_dev))
1141 goto done;
1142 if (IGMP_V2_SEEN(in_dev)) {
1143 if (reporter)
1144 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1145 goto done;
1146 }
1147 /* IGMPv3 */
1148 igmpv3_add_delrec(in_dev, im);
1149
1150 igmp_ifc_event(in_dev);
1151 }
1152 done:
1153 #endif
1154 ip_mc_clear_src(im);
1155 }
1156
1157 static void igmp_group_added(struct ip_mc_list *im)
1158 {
1159 struct in_device *in_dev = im->interface;
1160
1161 if (im->loaded == 0) {
1162 im->loaded = 1;
1163 ip_mc_filter_add(in_dev, im->multiaddr);
1164 }
1165
1166 #ifdef CONFIG_IP_MULTICAST
1167 if (im->multiaddr == IGMP_ALL_HOSTS)
1168 return;
1169
1170 if (in_dev->dead)
1171 return;
1172 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1173 spin_lock_bh(&im->lock);
1174 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1175 spin_unlock_bh(&im->lock);
1176 return;
1177 }
1178 /* else, v3 */
1179
1180 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1181 IGMP_Unsolicited_Report_Count;
1182 igmp_ifc_event(in_dev);
1183 #endif
1184 }
1185
1186
1187 /*
1188 * Multicast list managers
1189 */
1190
1191
1192 /*
1193 * A socket has joined a multicast group on device dev.
1194 */
1195
1196 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1197 {
1198 struct ip_mc_list *im;
1199
1200 ASSERT_RTNL();
1201
1202 for (im=in_dev->mc_list; im; im=im->next) {
1203 if (im->multiaddr == addr) {
1204 im->users++;
1205 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1206 goto out;
1207 }
1208 }
1209
1210 im = kmalloc(sizeof(*im), GFP_KERNEL);
1211 if (!im)
1212 goto out;
1213
1214 im->users=1;
1215 im->interface=in_dev;
1216 in_dev_hold(in_dev);
1217 im->multiaddr=addr;
1218 /* initial mode is (EX, empty) */
1219 im->sfmode = MCAST_EXCLUDE;
1220 im->sfcount[MCAST_INCLUDE] = 0;
1221 im->sfcount[MCAST_EXCLUDE] = 1;
1222 im->sources = NULL;
1223 im->tomb = NULL;
1224 im->crcount = 0;
1225 atomic_set(&im->refcnt, 1);
1226 spin_lock_init(&im->lock);
1227 #ifdef CONFIG_IP_MULTICAST
1228 im->tm_running=0;
1229 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1230 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1231 im->reporter = 0;
1232 im->gsquery = 0;
1233 #endif
1234 im->loaded = 0;
1235 write_lock_bh(&in_dev->mc_list_lock);
1236 im->next=in_dev->mc_list;
1237 in_dev->mc_list=im;
1238 write_unlock_bh(&in_dev->mc_list_lock);
1239 #ifdef CONFIG_IP_MULTICAST
1240 igmpv3_del_delrec(in_dev, im->multiaddr);
1241 #endif
1242 igmp_group_added(im);
1243 if (!in_dev->dead)
1244 ip_rt_multicast_event(in_dev);
1245 out:
1246 return;
1247 }
1248
1249 /*
1250 * Resend IGMP JOIN report; used for bonding.
1251 */
1252 void ip_mc_rejoin_group(struct ip_mc_list *im)
1253 {
1254 #ifdef CONFIG_IP_MULTICAST
1255 struct in_device *in_dev = im->interface;
1256
1257 if (im->multiaddr == IGMP_ALL_HOSTS)
1258 return;
1259
1260 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1261 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1262 return;
1263 }
1264 /* else, v3 */
1265 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1266 IGMP_Unsolicited_Report_Count;
1267 igmp_ifc_event(in_dev);
1268 #endif
1269 }
1270
1271 /*
1272 * A socket has left a multicast group on device dev
1273 */
1274
1275 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1276 {
1277 struct ip_mc_list *i, **ip;
1278
1279 ASSERT_RTNL();
1280
1281 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1282 if (i->multiaddr==addr) {
1283 if (--i->users == 0) {
1284 write_lock_bh(&in_dev->mc_list_lock);
1285 *ip = i->next;
1286 write_unlock_bh(&in_dev->mc_list_lock);
1287 igmp_group_dropped(i);
1288
1289 if (!in_dev->dead)
1290 ip_rt_multicast_event(in_dev);
1291
1292 ip_ma_put(i);
1293 return;
1294 }
1295 break;
1296 }
1297 }
1298 }
1299
1300 /* Device going down */
1301
1302 void ip_mc_down(struct in_device *in_dev)
1303 {
1304 struct ip_mc_list *i;
1305
1306 ASSERT_RTNL();
1307
1308 for (i=in_dev->mc_list; i; i=i->next)
1309 igmp_group_dropped(i);
1310
1311 #ifdef CONFIG_IP_MULTICAST
1312 in_dev->mr_ifc_count = 0;
1313 if (del_timer(&in_dev->mr_ifc_timer))
1314 __in_dev_put(in_dev);
1315 in_dev->mr_gq_running = 0;
1316 if (del_timer(&in_dev->mr_gq_timer))
1317 __in_dev_put(in_dev);
1318 igmpv3_clear_delrec(in_dev);
1319 #endif
1320
1321 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1322 }
1323
1324 void ip_mc_init_dev(struct in_device *in_dev)
1325 {
1326 ASSERT_RTNL();
1327
1328 in_dev->mc_tomb = NULL;
1329 #ifdef CONFIG_IP_MULTICAST
1330 in_dev->mr_gq_running = 0;
1331 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1332 (unsigned long)in_dev);
1333 in_dev->mr_ifc_count = 0;
1334 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1335 (unsigned long)in_dev);
1336 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1337 #endif
1338
1339 rwlock_init(&in_dev->mc_list_lock);
1340 spin_lock_init(&in_dev->mc_tomb_lock);
1341 }
1342
1343 /* Device going up */
1344
1345 void ip_mc_up(struct in_device *in_dev)
1346 {
1347 struct ip_mc_list *i;
1348
1349 ASSERT_RTNL();
1350
1351 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1352
1353 for (i=in_dev->mc_list; i; i=i->next)
1354 igmp_group_added(i);
1355 }
1356
1357 /*
1358 * Device is about to be destroyed: clean up.
1359 */
1360
1361 void ip_mc_destroy_dev(struct in_device *in_dev)
1362 {
1363 struct ip_mc_list *i;
1364
1365 ASSERT_RTNL();
1366
1367 /* Deactivate timers */
1368 ip_mc_down(in_dev);
1369
1370 write_lock_bh(&in_dev->mc_list_lock);
1371 while ((i = in_dev->mc_list) != NULL) {
1372 in_dev->mc_list = i->next;
1373 write_unlock_bh(&in_dev->mc_list_lock);
1374
1375 igmp_group_dropped(i);
1376 ip_ma_put(i);
1377
1378 write_lock_bh(&in_dev->mc_list_lock);
1379 }
1380 write_unlock_bh(&in_dev->mc_list_lock);
1381 }
1382
1383 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1384 {
1385 struct flowi fl = { .nl_u = { .ip4_u =
1386 { .daddr = imr->imr_multiaddr.s_addr } } };
1387 struct rtable *rt;
1388 struct net_device *dev = NULL;
1389 struct in_device *idev = NULL;
1390
1391 if (imr->imr_ifindex) {
1392 idev = inetdev_by_index(&init_net, imr->imr_ifindex);
1393 if (idev)
1394 __in_dev_put(idev);
1395 return idev;
1396 }
1397 if (imr->imr_address.s_addr) {
1398 dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
1399 if (!dev)
1400 return NULL;
1401 dev_put(dev);
1402 }
1403
1404 if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) {
1405 dev = rt->u.dst.dev;
1406 ip_rt_put(rt);
1407 }
1408 if (dev) {
1409 imr->imr_ifindex = dev->ifindex;
1410 idev = __in_dev_get_rtnl(dev);
1411 }
1412 return idev;
1413 }
1414
1415 /*
1416 * Join a socket to a group
1417 */
1418 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1419 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1420
1421
1422 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1423 __be32 *psfsrc)
1424 {
1425 struct ip_sf_list *psf, *psf_prev;
1426 int rv = 0;
1427
1428 psf_prev = NULL;
1429 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1430 if (psf->sf_inaddr == *psfsrc)
1431 break;
1432 psf_prev = psf;
1433 }
1434 if (!psf || psf->sf_count[sfmode] == 0) {
1435 /* source filter not found, or count wrong => bug */
1436 return -ESRCH;
1437 }
1438 psf->sf_count[sfmode]--;
1439 if (psf->sf_count[sfmode] == 0) {
1440 ip_rt_multicast_event(pmc->interface);
1441 }
1442 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1443 #ifdef CONFIG_IP_MULTICAST
1444 struct in_device *in_dev = pmc->interface;
1445 #endif
1446
1447 /* no more filters for this source */
1448 if (psf_prev)
1449 psf_prev->sf_next = psf->sf_next;
1450 else
1451 pmc->sources = psf->sf_next;
1452 #ifdef CONFIG_IP_MULTICAST
1453 if (psf->sf_oldin &&
1454 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1455 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1456 IGMP_Unsolicited_Report_Count;
1457 psf->sf_next = pmc->tomb;
1458 pmc->tomb = psf;
1459 rv = 1;
1460 } else
1461 #endif
1462 kfree(psf);
1463 }
1464 return rv;
1465 }
1466
1467 #ifndef CONFIG_IP_MULTICAST
1468 #define igmp_ifc_event(x) do { } while (0)
1469 #endif
1470
1471 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1472 int sfcount, __be32 *psfsrc, int delta)
1473 {
1474 struct ip_mc_list *pmc;
1475 int changerec = 0;
1476 int i, err;
1477
1478 if (!in_dev)
1479 return -ENODEV;
1480 read_lock(&in_dev->mc_list_lock);
1481 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1482 if (*pmca == pmc->multiaddr)
1483 break;
1484 }
1485 if (!pmc) {
1486 /* MCA not found?? bug */
1487 read_unlock(&in_dev->mc_list_lock);
1488 return -ESRCH;
1489 }
1490 spin_lock_bh(&pmc->lock);
1491 read_unlock(&in_dev->mc_list_lock);
1492 #ifdef CONFIG_IP_MULTICAST
1493 sf_markstate(pmc);
1494 #endif
1495 if (!delta) {
1496 err = -EINVAL;
1497 if (!pmc->sfcount[sfmode])
1498 goto out_unlock;
1499 pmc->sfcount[sfmode]--;
1500 }
1501 err = 0;
1502 for (i=0; i<sfcount; i++) {
1503 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1504
1505 changerec |= rv > 0;
1506 if (!err && rv < 0)
1507 err = rv;
1508 }
1509 if (pmc->sfmode == MCAST_EXCLUDE &&
1510 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1511 pmc->sfcount[MCAST_INCLUDE]) {
1512 #ifdef CONFIG_IP_MULTICAST
1513 struct ip_sf_list *psf;
1514 #endif
1515
1516 /* filter mode change */
1517 pmc->sfmode = MCAST_INCLUDE;
1518 #ifdef CONFIG_IP_MULTICAST
1519 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1520 IGMP_Unsolicited_Report_Count;
1521 in_dev->mr_ifc_count = pmc->crcount;
1522 for (psf=pmc->sources; psf; psf = psf->sf_next)
1523 psf->sf_crcount = 0;
1524 igmp_ifc_event(pmc->interface);
1525 } else if (sf_setstate(pmc) || changerec) {
1526 igmp_ifc_event(pmc->interface);
1527 #endif
1528 }
1529 out_unlock:
1530 spin_unlock_bh(&pmc->lock);
1531 return err;
1532 }
1533
1534 /*
1535 * Add multicast single-source filter to the interface list
1536 */
1537 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1538 __be32 *psfsrc, int delta)
1539 {
1540 struct ip_sf_list *psf, *psf_prev;
1541
1542 psf_prev = NULL;
1543 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1544 if (psf->sf_inaddr == *psfsrc)
1545 break;
1546 psf_prev = psf;
1547 }
1548 if (!psf) {
1549 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1550 if (!psf)
1551 return -ENOBUFS;
1552 psf->sf_inaddr = *psfsrc;
1553 if (psf_prev) {
1554 psf_prev->sf_next = psf;
1555 } else
1556 pmc->sources = psf;
1557 }
1558 psf->sf_count[sfmode]++;
1559 if (psf->sf_count[sfmode] == 1) {
1560 ip_rt_multicast_event(pmc->interface);
1561 }
1562 return 0;
1563 }
1564
1565 #ifdef CONFIG_IP_MULTICAST
1566 static void sf_markstate(struct ip_mc_list *pmc)
1567 {
1568 struct ip_sf_list *psf;
1569 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1570
1571 for (psf=pmc->sources; psf; psf=psf->sf_next)
1572 if (pmc->sfcount[MCAST_EXCLUDE]) {
1573 psf->sf_oldin = mca_xcount ==
1574 psf->sf_count[MCAST_EXCLUDE] &&
1575 !psf->sf_count[MCAST_INCLUDE];
1576 } else
1577 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1578 }
1579
1580 static int sf_setstate(struct ip_mc_list *pmc)
1581 {
1582 struct ip_sf_list *psf, *dpsf;
1583 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1584 int qrv = pmc->interface->mr_qrv;
1585 int new_in, rv;
1586
1587 rv = 0;
1588 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1589 if (pmc->sfcount[MCAST_EXCLUDE]) {
1590 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1591 !psf->sf_count[MCAST_INCLUDE];
1592 } else
1593 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1594 if (new_in) {
1595 if (!psf->sf_oldin) {
1596 struct ip_sf_list *prev = NULL;
1597
1598 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1599 if (dpsf->sf_inaddr == psf->sf_inaddr)
1600 break;
1601 prev = dpsf;
1602 }
1603 if (dpsf) {
1604 if (prev)
1605 prev->sf_next = dpsf->sf_next;
1606 else
1607 pmc->tomb = dpsf->sf_next;
1608 kfree(dpsf);
1609 }
1610 psf->sf_crcount = qrv;
1611 rv++;
1612 }
1613 } else if (psf->sf_oldin) {
1614
1615 psf->sf_crcount = 0;
1616 /*
1617 * add or update "delete" records if an active filter
1618 * is now inactive
1619 */
1620 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1621 if (dpsf->sf_inaddr == psf->sf_inaddr)
1622 break;
1623 if (!dpsf) {
1624 dpsf = (struct ip_sf_list *)
1625 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1626 if (!dpsf)
1627 continue;
1628 *dpsf = *psf;
1629 /* pmc->lock held by callers */
1630 dpsf->sf_next = pmc->tomb;
1631 pmc->tomb = dpsf;
1632 }
1633 dpsf->sf_crcount = qrv;
1634 rv++;
1635 }
1636 }
1637 return rv;
1638 }
1639 #endif
1640
1641 /*
1642 * Add multicast source filter list to the interface list
1643 */
1644 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1645 int sfcount, __be32 *psfsrc, int delta)
1646 {
1647 struct ip_mc_list *pmc;
1648 int isexclude;
1649 int i, err;
1650
1651 if (!in_dev)
1652 return -ENODEV;
1653 read_lock(&in_dev->mc_list_lock);
1654 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1655 if (*pmca == pmc->multiaddr)
1656 break;
1657 }
1658 if (!pmc) {
1659 /* MCA not found?? bug */
1660 read_unlock(&in_dev->mc_list_lock);
1661 return -ESRCH;
1662 }
1663 spin_lock_bh(&pmc->lock);
1664 read_unlock(&in_dev->mc_list_lock);
1665
1666 #ifdef CONFIG_IP_MULTICAST
1667 sf_markstate(pmc);
1668 #endif
1669 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1670 if (!delta)
1671 pmc->sfcount[sfmode]++;
1672 err = 0;
1673 for (i=0; i<sfcount; i++) {
1674 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1675 if (err)
1676 break;
1677 }
1678 if (err) {
1679 int j;
1680
1681 pmc->sfcount[sfmode]--;
1682 for (j=0; j<i; j++)
1683 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1684 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1685 #ifdef CONFIG_IP_MULTICAST
1686 struct ip_sf_list *psf;
1687 in_dev = pmc->interface;
1688 #endif
1689
1690 /* filter mode change */
1691 if (pmc->sfcount[MCAST_EXCLUDE])
1692 pmc->sfmode = MCAST_EXCLUDE;
1693 else if (pmc->sfcount[MCAST_INCLUDE])
1694 pmc->sfmode = MCAST_INCLUDE;
1695 #ifdef CONFIG_IP_MULTICAST
1696 /* else no filters; keep old mode for reports */
1697
1698 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1699 IGMP_Unsolicited_Report_Count;
1700 in_dev->mr_ifc_count = pmc->crcount;
1701 for (psf=pmc->sources; psf; psf = psf->sf_next)
1702 psf->sf_crcount = 0;
1703 igmp_ifc_event(in_dev);
1704 } else if (sf_setstate(pmc)) {
1705 igmp_ifc_event(in_dev);
1706 #endif
1707 }
1708 spin_unlock_bh(&pmc->lock);
1709 return err;
1710 }
1711
1712 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1713 {
1714 struct ip_sf_list *psf, *nextpsf;
1715
1716 for (psf=pmc->tomb; psf; psf=nextpsf) {
1717 nextpsf = psf->sf_next;
1718 kfree(psf);
1719 }
1720 pmc->tomb = NULL;
1721 for (psf=pmc->sources; psf; psf=nextpsf) {
1722 nextpsf = psf->sf_next;
1723 kfree(psf);
1724 }
1725 pmc->sources = NULL;
1726 pmc->sfmode = MCAST_EXCLUDE;
1727 pmc->sfcount[MCAST_INCLUDE] = 0;
1728 pmc->sfcount[MCAST_EXCLUDE] = 1;
1729 }
1730
1731
1732 /*
1733 * Join a multicast group
1734 */
1735 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1736 {
1737 int err;
1738 __be32 addr = imr->imr_multiaddr.s_addr;
1739 struct ip_mc_socklist *iml=NULL, *i;
1740 struct in_device *in_dev;
1741 struct inet_sock *inet = inet_sk(sk);
1742 int ifindex;
1743 int count = 0;
1744
1745 if (!ipv4_is_multicast(addr))
1746 return -EINVAL;
1747
1748 rtnl_lock();
1749
1750 in_dev = ip_mc_find_dev(imr);
1751
1752 if (!in_dev) {
1753 iml = NULL;
1754 err = -ENODEV;
1755 goto done;
1756 }
1757
1758 err = -EADDRINUSE;
1759 ifindex = imr->imr_ifindex;
1760 for (i = inet->mc_list; i; i = i->next) {
1761 if (i->multi.imr_multiaddr.s_addr == addr &&
1762 i->multi.imr_ifindex == ifindex)
1763 goto done;
1764 count++;
1765 }
1766 err = -ENOBUFS;
1767 if (count >= sysctl_igmp_max_memberships)
1768 goto done;
1769 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1770 if (iml == NULL)
1771 goto done;
1772
1773 memcpy(&iml->multi, imr, sizeof(*imr));
1774 iml->next = inet->mc_list;
1775 iml->sflist = NULL;
1776 iml->sfmode = MCAST_EXCLUDE;
1777 inet->mc_list = iml;
1778 ip_mc_inc_group(in_dev, addr);
1779 err = 0;
1780 done:
1781 rtnl_unlock();
1782 return err;
1783 }
1784
1785 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1786 struct in_device *in_dev)
1787 {
1788 int err;
1789
1790 if (iml->sflist == NULL) {
1791 /* any-source empty exclude case */
1792 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1793 iml->sfmode, 0, NULL, 0);
1794 }
1795 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1796 iml->sfmode, iml->sflist->sl_count,
1797 iml->sflist->sl_addr, 0);
1798 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1799 iml->sflist = NULL;
1800 return err;
1801 }
1802
1803 /*
1804 * Ask a socket to leave a group.
1805 */
1806
1807 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1808 {
1809 struct inet_sock *inet = inet_sk(sk);
1810 struct ip_mc_socklist *iml, **imlp;
1811 struct in_device *in_dev;
1812 __be32 group = imr->imr_multiaddr.s_addr;
1813 u32 ifindex;
1814 int ret = -EADDRNOTAVAIL;
1815
1816 rtnl_lock();
1817 in_dev = ip_mc_find_dev(imr);
1818 ifindex = imr->imr_ifindex;
1819 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1820 if (iml->multi.imr_multiaddr.s_addr != group)
1821 continue;
1822 if (ifindex) {
1823 if (iml->multi.imr_ifindex != ifindex)
1824 continue;
1825 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1826 iml->multi.imr_address.s_addr)
1827 continue;
1828
1829 (void) ip_mc_leave_src(sk, iml, in_dev);
1830
1831 *imlp = iml->next;
1832
1833 if (in_dev)
1834 ip_mc_dec_group(in_dev, group);
1835 rtnl_unlock();
1836 sock_kfree_s(sk, iml, sizeof(*iml));
1837 return 0;
1838 }
1839 if (!in_dev)
1840 ret = -ENODEV;
1841 rtnl_unlock();
1842 return ret;
1843 }
1844
1845 int ip_mc_source(int add, int omode, struct sock *sk, struct
1846 ip_mreq_source *mreqs, int ifindex)
1847 {
1848 int err;
1849 struct ip_mreqn imr;
1850 __be32 addr = mreqs->imr_multiaddr;
1851 struct ip_mc_socklist *pmc;
1852 struct in_device *in_dev = NULL;
1853 struct inet_sock *inet = inet_sk(sk);
1854 struct ip_sf_socklist *psl;
1855 int leavegroup = 0;
1856 int i, j, rv;
1857
1858 if (!ipv4_is_multicast(addr))
1859 return -EINVAL;
1860
1861 rtnl_lock();
1862
1863 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1864 imr.imr_address.s_addr = mreqs->imr_interface;
1865 imr.imr_ifindex = ifindex;
1866 in_dev = ip_mc_find_dev(&imr);
1867
1868 if (!in_dev) {
1869 err = -ENODEV;
1870 goto done;
1871 }
1872 err = -EADDRNOTAVAIL;
1873
1874 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1875 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1876 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1877 break;
1878 }
1879 if (!pmc) { /* must have a prior join */
1880 err = -EINVAL;
1881 goto done;
1882 }
1883 /* if a source filter was set, must be the same mode as before */
1884 if (pmc->sflist) {
1885 if (pmc->sfmode != omode) {
1886 err = -EINVAL;
1887 goto done;
1888 }
1889 } else if (pmc->sfmode != omode) {
1890 /* allow mode switches for empty-set filters */
1891 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1892 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1893 NULL, 0);
1894 pmc->sfmode = omode;
1895 }
1896
1897 psl = pmc->sflist;
1898 if (!add) {
1899 if (!psl)
1900 goto done; /* err = -EADDRNOTAVAIL */
1901 rv = !0;
1902 for (i=0; i<psl->sl_count; i++) {
1903 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1904 sizeof(__be32));
1905 if (rv == 0)
1906 break;
1907 }
1908 if (rv) /* source not found */
1909 goto done; /* err = -EADDRNOTAVAIL */
1910
1911 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1912 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1913 leavegroup = 1;
1914 goto done;
1915 }
1916
1917 /* update the interface filter */
1918 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1919 &mreqs->imr_sourceaddr, 1);
1920
1921 for (j=i+1; j<psl->sl_count; j++)
1922 psl->sl_addr[j-1] = psl->sl_addr[j];
1923 psl->sl_count--;
1924 err = 0;
1925 goto done;
1926 }
1927 /* else, add a new source to the filter */
1928
1929 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1930 err = -ENOBUFS;
1931 goto done;
1932 }
1933 if (!psl || psl->sl_count == psl->sl_max) {
1934 struct ip_sf_socklist *newpsl;
1935 int count = IP_SFBLOCK;
1936
1937 if (psl)
1938 count += psl->sl_max;
1939 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1940 if (!newpsl) {
1941 err = -ENOBUFS;
1942 goto done;
1943 }
1944 newpsl->sl_max = count;
1945 newpsl->sl_count = count - IP_SFBLOCK;
1946 if (psl) {
1947 for (i=0; i<psl->sl_count; i++)
1948 newpsl->sl_addr[i] = psl->sl_addr[i];
1949 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1950 }
1951 pmc->sflist = psl = newpsl;
1952 }
1953 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1954 for (i=0; i<psl->sl_count; i++) {
1955 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1956 sizeof(__be32));
1957 if (rv == 0)
1958 break;
1959 }
1960 if (rv == 0) /* address already there is an error */
1961 goto done;
1962 for (j=psl->sl_count-1; j>=i; j--)
1963 psl->sl_addr[j+1] = psl->sl_addr[j];
1964 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1965 psl->sl_count++;
1966 err = 0;
1967 /* update the interface list */
1968 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1969 &mreqs->imr_sourceaddr, 1);
1970 done:
1971 rtnl_unlock();
1972 if (leavegroup)
1973 return ip_mc_leave_group(sk, &imr);
1974 return err;
1975 }
1976
1977 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1978 {
1979 int err = 0;
1980 struct ip_mreqn imr;
1981 __be32 addr = msf->imsf_multiaddr;
1982 struct ip_mc_socklist *pmc;
1983 struct in_device *in_dev;
1984 struct inet_sock *inet = inet_sk(sk);
1985 struct ip_sf_socklist *newpsl, *psl;
1986 int leavegroup = 0;
1987
1988 if (!ipv4_is_multicast(addr))
1989 return -EINVAL;
1990 if (msf->imsf_fmode != MCAST_INCLUDE &&
1991 msf->imsf_fmode != MCAST_EXCLUDE)
1992 return -EINVAL;
1993
1994 rtnl_lock();
1995
1996 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1997 imr.imr_address.s_addr = msf->imsf_interface;
1998 imr.imr_ifindex = ifindex;
1999 in_dev = ip_mc_find_dev(&imr);
2000
2001 if (!in_dev) {
2002 err = -ENODEV;
2003 goto done;
2004 }
2005
2006 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2007 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2008 leavegroup = 1;
2009 goto done;
2010 }
2011
2012 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2013 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2014 pmc->multi.imr_ifindex == imr.imr_ifindex)
2015 break;
2016 }
2017 if (!pmc) { /* must have a prior join */
2018 err = -EINVAL;
2019 goto done;
2020 }
2021 if (msf->imsf_numsrc) {
2022 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2023 GFP_KERNEL);
2024 if (!newpsl) {
2025 err = -ENOBUFS;
2026 goto done;
2027 }
2028 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2029 memcpy(newpsl->sl_addr, msf->imsf_slist,
2030 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2031 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2032 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2033 if (err) {
2034 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2035 goto done;
2036 }
2037 } else {
2038 newpsl = NULL;
2039 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2040 msf->imsf_fmode, 0, NULL, 0);
2041 }
2042 psl = pmc->sflist;
2043 if (psl) {
2044 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2045 psl->sl_count, psl->sl_addr, 0);
2046 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2047 } else
2048 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2049 0, NULL, 0);
2050 pmc->sflist = newpsl;
2051 pmc->sfmode = msf->imsf_fmode;
2052 err = 0;
2053 done:
2054 rtnl_unlock();
2055 if (leavegroup)
2056 err = ip_mc_leave_group(sk, &imr);
2057 return err;
2058 }
2059
2060 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2061 struct ip_msfilter __user *optval, int __user *optlen)
2062 {
2063 int err, len, count, copycount;
2064 struct ip_mreqn imr;
2065 __be32 addr = msf->imsf_multiaddr;
2066 struct ip_mc_socklist *pmc;
2067 struct in_device *in_dev;
2068 struct inet_sock *inet = inet_sk(sk);
2069 struct ip_sf_socklist *psl;
2070
2071 if (!ipv4_is_multicast(addr))
2072 return -EINVAL;
2073
2074 rtnl_lock();
2075
2076 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2077 imr.imr_address.s_addr = msf->imsf_interface;
2078 imr.imr_ifindex = 0;
2079 in_dev = ip_mc_find_dev(&imr);
2080
2081 if (!in_dev) {
2082 err = -ENODEV;
2083 goto done;
2084 }
2085 err = -EADDRNOTAVAIL;
2086
2087 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2088 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2089 pmc->multi.imr_ifindex == imr.imr_ifindex)
2090 break;
2091 }
2092 if (!pmc) /* must have a prior join */
2093 goto done;
2094 msf->imsf_fmode = pmc->sfmode;
2095 psl = pmc->sflist;
2096 rtnl_unlock();
2097 if (!psl) {
2098 len = 0;
2099 count = 0;
2100 } else {
2101 count = psl->sl_count;
2102 }
2103 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2104 len = copycount * sizeof(psl->sl_addr[0]);
2105 msf->imsf_numsrc = count;
2106 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2107 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2108 return -EFAULT;
2109 }
2110 if (len &&
2111 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2112 return -EFAULT;
2113 return 0;
2114 done:
2115 rtnl_unlock();
2116 return err;
2117 }
2118
2119 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2120 struct group_filter __user *optval, int __user *optlen)
2121 {
2122 int err, i, count, copycount;
2123 struct sockaddr_in *psin;
2124 __be32 addr;
2125 struct ip_mc_socklist *pmc;
2126 struct inet_sock *inet = inet_sk(sk);
2127 struct ip_sf_socklist *psl;
2128
2129 psin = (struct sockaddr_in *)&gsf->gf_group;
2130 if (psin->sin_family != AF_INET)
2131 return -EINVAL;
2132 addr = psin->sin_addr.s_addr;
2133 if (!ipv4_is_multicast(addr))
2134 return -EINVAL;
2135
2136 rtnl_lock();
2137
2138 err = -EADDRNOTAVAIL;
2139
2140 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2141 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2142 pmc->multi.imr_ifindex == gsf->gf_interface)
2143 break;
2144 }
2145 if (!pmc) /* must have a prior join */
2146 goto done;
2147 gsf->gf_fmode = pmc->sfmode;
2148 psl = pmc->sflist;
2149 rtnl_unlock();
2150 count = psl ? psl->sl_count : 0;
2151 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2152 gsf->gf_numsrc = count;
2153 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2154 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2155 return -EFAULT;
2156 }
2157 for (i=0; i<copycount; i++) {
2158 struct sockaddr_storage ss;
2159
2160 psin = (struct sockaddr_in *)&ss;
2161 memset(&ss, 0, sizeof(ss));
2162 psin->sin_family = AF_INET;
2163 psin->sin_addr.s_addr = psl->sl_addr[i];
2164 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2165 return -EFAULT;
2166 }
2167 return 0;
2168 done:
2169 rtnl_unlock();
2170 return err;
2171 }
2172
2173 /*
2174 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2175 */
2176 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2177 {
2178 struct inet_sock *inet = inet_sk(sk);
2179 struct ip_mc_socklist *pmc;
2180 struct ip_sf_socklist *psl;
2181 int i;
2182
2183 if (!ipv4_is_multicast(loc_addr))
2184 return 1;
2185
2186 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2187 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2188 pmc->multi.imr_ifindex == dif)
2189 break;
2190 }
2191 if (!pmc)
2192 return 1;
2193 psl = pmc->sflist;
2194 if (!psl)
2195 return pmc->sfmode == MCAST_EXCLUDE;
2196
2197 for (i=0; i<psl->sl_count; i++) {
2198 if (psl->sl_addr[i] == rmt_addr)
2199 break;
2200 }
2201 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2202 return 0;
2203 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2204 return 0;
2205 return 1;
2206 }
2207
2208 /*
2209 * A socket is closing.
2210 */
2211
2212 void ip_mc_drop_socket(struct sock *sk)
2213 {
2214 struct inet_sock *inet = inet_sk(sk);
2215 struct ip_mc_socklist *iml;
2216
2217 if (inet->mc_list == NULL)
2218 return;
2219
2220 rtnl_lock();
2221 while ((iml = inet->mc_list) != NULL) {
2222 struct in_device *in_dev;
2223 inet->mc_list = iml->next;
2224
2225 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex);
2226 (void) ip_mc_leave_src(sk, iml, in_dev);
2227 if (in_dev != NULL) {
2228 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2229 in_dev_put(in_dev);
2230 }
2231 sock_kfree_s(sk, iml, sizeof(*iml));
2232 }
2233 rtnl_unlock();
2234 }
2235
2236 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2237 {
2238 struct ip_mc_list *im;
2239 struct ip_sf_list *psf;
2240 int rv = 0;
2241
2242 read_lock(&in_dev->mc_list_lock);
2243 for (im=in_dev->mc_list; im; im=im->next) {
2244 if (im->multiaddr == mc_addr)
2245 break;
2246 }
2247 if (im && proto == IPPROTO_IGMP) {
2248 rv = 1;
2249 } else if (im) {
2250 if (src_addr) {
2251 for (psf=im->sources; psf; psf=psf->sf_next) {
2252 if (psf->sf_inaddr == src_addr)
2253 break;
2254 }
2255 if (psf)
2256 rv = psf->sf_count[MCAST_INCLUDE] ||
2257 psf->sf_count[MCAST_EXCLUDE] !=
2258 im->sfcount[MCAST_EXCLUDE];
2259 else
2260 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2261 } else
2262 rv = 1; /* unspecified source; tentatively allow */
2263 }
2264 read_unlock(&in_dev->mc_list_lock);
2265 return rv;
2266 }
2267
2268 #if defined(CONFIG_PROC_FS)
2269 struct igmp_mc_iter_state {
2270 struct net_device *dev;
2271 struct in_device *in_dev;
2272 };
2273
2274 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2275
2276 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2277 {
2278 struct ip_mc_list *im = NULL;
2279 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2280
2281 state->in_dev = NULL;
2282 for_each_netdev(&init_net, state->dev) {
2283 struct in_device *in_dev;
2284 in_dev = in_dev_get(state->dev);
2285 if (!in_dev)
2286 continue;
2287 read_lock(&in_dev->mc_list_lock);
2288 im = in_dev->mc_list;
2289 if (im) {
2290 state->in_dev = in_dev;
2291 break;
2292 }
2293 read_unlock(&in_dev->mc_list_lock);
2294 in_dev_put(in_dev);
2295 }
2296 return im;
2297 }
2298
2299 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2300 {
2301 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2302 im = im->next;
2303 while (!im) {
2304 if (likely(state->in_dev != NULL)) {
2305 read_unlock(&state->in_dev->mc_list_lock);
2306 in_dev_put(state->in_dev);
2307 }
2308 state->dev = next_net_device(state->dev);
2309 if (!state->dev) {
2310 state->in_dev = NULL;
2311 break;
2312 }
2313 state->in_dev = in_dev_get(state->dev);
2314 if (!state->in_dev)
2315 continue;
2316 read_lock(&state->in_dev->mc_list_lock);
2317 im = state->in_dev->mc_list;
2318 }
2319 return im;
2320 }
2321
2322 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2323 {
2324 struct ip_mc_list *im = igmp_mc_get_first(seq);
2325 if (im)
2326 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2327 --pos;
2328 return pos ? NULL : im;
2329 }
2330
2331 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2332 __acquires(dev_base_lock)
2333 {
2334 read_lock(&dev_base_lock);
2335 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2336 }
2337
2338 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2339 {
2340 struct ip_mc_list *im;
2341 if (v == SEQ_START_TOKEN)
2342 im = igmp_mc_get_first(seq);
2343 else
2344 im = igmp_mc_get_next(seq, v);
2345 ++*pos;
2346 return im;
2347 }
2348
2349 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2350 __releases(dev_base_lock)
2351 {
2352 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2353 if (likely(state->in_dev != NULL)) {
2354 read_unlock(&state->in_dev->mc_list_lock);
2355 in_dev_put(state->in_dev);
2356 state->in_dev = NULL;
2357 }
2358 state->dev = NULL;
2359 read_unlock(&dev_base_lock);
2360 }
2361
2362 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2363 {
2364 if (v == SEQ_START_TOKEN)
2365 seq_puts(seq,
2366 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2367 else {
2368 struct ip_mc_list *im = (struct ip_mc_list *)v;
2369 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2370 char *querier;
2371 #ifdef CONFIG_IP_MULTICAST
2372 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2373 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2374 "V3";
2375 #else
2376 querier = "NONE";
2377 #endif
2378
2379 if (state->in_dev->mc_list == im) {
2380 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2381 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2382 }
2383
2384 seq_printf(seq,
2385 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2386 im->multiaddr, im->users,
2387 im->tm_running, im->tm_running ?
2388 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2389 im->reporter);
2390 }
2391 return 0;
2392 }
2393
2394 static const struct seq_operations igmp_mc_seq_ops = {
2395 .start = igmp_mc_seq_start,
2396 .next = igmp_mc_seq_next,
2397 .stop = igmp_mc_seq_stop,
2398 .show = igmp_mc_seq_show,
2399 };
2400
2401 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2402 {
2403 return seq_open_private(file, &igmp_mc_seq_ops,
2404 sizeof(struct igmp_mc_iter_state));
2405 }
2406
2407 static const struct file_operations igmp_mc_seq_fops = {
2408 .owner = THIS_MODULE,
2409 .open = igmp_mc_seq_open,
2410 .read = seq_read,
2411 .llseek = seq_lseek,
2412 .release = seq_release_private,
2413 };
2414
2415 struct igmp_mcf_iter_state {
2416 struct net_device *dev;
2417 struct in_device *idev;
2418 struct ip_mc_list *im;
2419 };
2420
2421 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2422
2423 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2424 {
2425 struct ip_sf_list *psf = NULL;
2426 struct ip_mc_list *im = NULL;
2427 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2428
2429 state->idev = NULL;
2430 state->im = NULL;
2431 for_each_netdev(&init_net, state->dev) {
2432 struct in_device *idev;
2433 idev = in_dev_get(state->dev);
2434 if (unlikely(idev == NULL))
2435 continue;
2436 read_lock(&idev->mc_list_lock);
2437 im = idev->mc_list;
2438 if (likely(im != NULL)) {
2439 spin_lock_bh(&im->lock);
2440 psf = im->sources;
2441 if (likely(psf != NULL)) {
2442 state->im = im;
2443 state->idev = idev;
2444 break;
2445 }
2446 spin_unlock_bh(&im->lock);
2447 }
2448 read_unlock(&idev->mc_list_lock);
2449 in_dev_put(idev);
2450 }
2451 return psf;
2452 }
2453
2454 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2455 {
2456 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2457
2458 psf = psf->sf_next;
2459 while (!psf) {
2460 spin_unlock_bh(&state->im->lock);
2461 state->im = state->im->next;
2462 while (!state->im) {
2463 if (likely(state->idev != NULL)) {
2464 read_unlock(&state->idev->mc_list_lock);
2465 in_dev_put(state->idev);
2466 }
2467 state->dev = next_net_device(state->dev);
2468 if (!state->dev) {
2469 state->idev = NULL;
2470 goto out;
2471 }
2472 state->idev = in_dev_get(state->dev);
2473 if (!state->idev)
2474 continue;
2475 read_lock(&state->idev->mc_list_lock);
2476 state->im = state->idev->mc_list;
2477 }
2478 if (!state->im)
2479 break;
2480 spin_lock_bh(&state->im->lock);
2481 psf = state->im->sources;
2482 }
2483 out:
2484 return psf;
2485 }
2486
2487 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2488 {
2489 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2490 if (psf)
2491 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2492 --pos;
2493 return pos ? NULL : psf;
2494 }
2495
2496 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2497 {
2498 read_lock(&dev_base_lock);
2499 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2500 }
2501
2502 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2503 {
2504 struct ip_sf_list *psf;
2505 if (v == SEQ_START_TOKEN)
2506 psf = igmp_mcf_get_first(seq);
2507 else
2508 psf = igmp_mcf_get_next(seq, v);
2509 ++*pos;
2510 return psf;
2511 }
2512
2513 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2514 {
2515 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2516 if (likely(state->im != NULL)) {
2517 spin_unlock_bh(&state->im->lock);
2518 state->im = NULL;
2519 }
2520 if (likely(state->idev != NULL)) {
2521 read_unlock(&state->idev->mc_list_lock);
2522 in_dev_put(state->idev);
2523 state->idev = NULL;
2524 }
2525 state->dev = NULL;
2526 read_unlock(&dev_base_lock);
2527 }
2528
2529 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2530 {
2531 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2532 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2533
2534 if (v == SEQ_START_TOKEN) {
2535 seq_printf(seq,
2536 "%3s %6s "
2537 "%10s %10s %6s %6s\n", "Idx",
2538 "Device", "MCA",
2539 "SRC", "INC", "EXC");
2540 } else {
2541 seq_printf(seq,
2542 "%3d %6.6s 0x%08x "
2543 "0x%08x %6lu %6lu\n",
2544 state->dev->ifindex, state->dev->name,
2545 ntohl(state->im->multiaddr),
2546 ntohl(psf->sf_inaddr),
2547 psf->sf_count[MCAST_INCLUDE],
2548 psf->sf_count[MCAST_EXCLUDE]);
2549 }
2550 return 0;
2551 }
2552
2553 static const struct seq_operations igmp_mcf_seq_ops = {
2554 .start = igmp_mcf_seq_start,
2555 .next = igmp_mcf_seq_next,
2556 .stop = igmp_mcf_seq_stop,
2557 .show = igmp_mcf_seq_show,
2558 };
2559
2560 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2561 {
2562 return seq_open_private(file, &igmp_mcf_seq_ops,
2563 sizeof(struct igmp_mcf_iter_state));
2564 }
2565
2566 static const struct file_operations igmp_mcf_seq_fops = {
2567 .owner = THIS_MODULE,
2568 .open = igmp_mcf_seq_open,
2569 .read = seq_read,
2570 .llseek = seq_lseek,
2571 .release = seq_release_private,
2572 };
2573
2574 int __init igmp_mc_proc_init(void)
2575 {
2576 proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2577 proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2578 return 0;
2579 }
2580 #endif
2581
2582 EXPORT_SYMBOL(ip_mc_dec_group);
2583 EXPORT_SYMBOL(ip_mc_inc_group);
2584 EXPORT_SYMBOL(ip_mc_join_group);
2585 EXPORT_SYMBOL(ip_mc_rejoin_group);
SocketAccessConTroL development