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[SOCK]: Introduce sk_receive_skb
[deliverable/linux.git] / net / ipv4 / igmp.c
CommitLineData
1da177e4
LT		 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/config.h>
76#include <linux/module.h>
77#include <asm/uaccess.h>
78#include <asm/system.h>
79#include <linux/types.h>
80#include <linux/kernel.h>
81#include <linux/jiffies.h>
82#include <linux/string.h>
83#include <linux/socket.h>
84#include <linux/sockios.h>
85#include <linux/in.h>
86#include <linux/inet.h>
87#include <linux/netdevice.h>
88#include <linux/skbuff.h>
89#include <linux/inetdevice.h>
90#include <linux/igmp.h>
91#include <linux/if_arp.h>
92#include <linux/rtnetlink.h>
93#include <linux/times.h>
94#include <net/ip.h>
95#include <net/protocol.h>
96#include <net/route.h>
97#include <net/sock.h>
98#include <net/checksum.h>
99#include <linux/netfilter_ipv4.h>
100#ifdef CONFIG_IP_MROUTE
101#include <linux/mroute.h>
102#endif
103#ifdef CONFIG_PROC_FS
104#include <linux/proc_fs.h>
105#include <linux/seq_file.h>
106#endif
107
108#define IP_MAX_MEMBERSHIPS 20
109#define IP_MAX_MSF 10
110
111#ifdef CONFIG_IP_MULTICAST
112/* Parameter names and values are taken from igmp-v2-06 draft */
113
114#define IGMP_V1_Router_Present_Timeout (400*HZ)
115#define IGMP_V2_Router_Present_Timeout (400*HZ)
116#define IGMP_Unsolicited_Report_Interval (10*HZ)
117#define IGMP_Query_Response_Interval (10*HZ)
118#define IGMP_Unsolicited_Report_Count 2
119
120
121#define IGMP_Initial_Report_Delay (1)
122
123/* IGMP_Initial_Report_Delay is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
128 */
129
130#define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \
131 (in_dev)->cnf.force_igmp_version == 1 || \
132 ((in_dev)->mr_v1_seen && \
133 time_before(jiffies, (in_dev)->mr_v1_seen)))
134#define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \
135 (in_dev)->cnf.force_igmp_version == 2 || \
136 ((in_dev)->mr_v2_seen && \
137 time_before(jiffies, (in_dev)->mr_v2_seen)))
138
139static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
140static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr);
141static void igmpv3_clear_delrec(struct in_device *in_dev);
142static int sf_setstate(struct ip_mc_list *pmc);
143static void sf_markstate(struct ip_mc_list *pmc);
144#endif
145static void ip_mc_clear_src(struct ip_mc_list *pmc);
146static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
147 int sfcount, __u32 *psfsrc, int delta);
148
149static void ip_ma_put(struct ip_mc_list *im)
150{
151 if (atomic_dec_and_test(&im->refcnt)) {
152 in_dev_put(im->interface);
153 kfree(im);
154 }
155}
156
157#ifdef CONFIG_IP_MULTICAST
158
159/*
160 * Timer management
161 */
162
163static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
164{
165 spin_lock_bh(&im->lock);
166 if (del_timer(&im->timer))
167 atomic_dec(&im->refcnt);
168 im->tm_running=0;
169 im->reporter = 0;
170 im->unsolicit_count = 0;
171 spin_unlock_bh(&im->lock);
172}
173
174/* It must be called with locked im->lock */
175static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
176{
177 int tv=net_random() % max_delay;
178
179 im->tm_running=1;
180 if (!mod_timer(&im->timer, jiffies+tv+2))
181 atomic_inc(&im->refcnt);
182}
183
184static void igmp_gq_start_timer(struct in_device *in_dev)
185{
186 int tv = net_random() % in_dev->mr_maxdelay;
187
188 in_dev->mr_gq_running = 1;
189 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
190 in_dev_hold(in_dev);
191}
192
193static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
194{
195 int tv = net_random() % delay;
196
197 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
198 in_dev_hold(in_dev);
199}
200
201static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
202{
203 spin_lock_bh(&im->lock);
204 im->unsolicit_count = 0;
205 if (del_timer(&im->timer)) {
206 if ((long)(im->timer.expires-jiffies) < max_delay) {
207 add_timer(&im->timer);
208 im->tm_running=1;
209 spin_unlock_bh(&im->lock);
210 return;
211 }
212 atomic_dec(&im->refcnt);
213 }
214 igmp_start_timer(im, max_delay);
215 spin_unlock_bh(&im->lock);
216}
217
218
219/*
220 * Send an IGMP report.
221 */
222
223#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
224
225
226static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
227 int gdeleted, int sdeleted)
228{
229 switch (type) {
230 case IGMPV3_MODE_IS_INCLUDE:
231 case IGMPV3_MODE_IS_EXCLUDE:
232 if (gdeleted || sdeleted)
233 return 0;
234 return !(pmc->gsquery && !psf->sf_gsresp);
235 case IGMPV3_CHANGE_TO_INCLUDE:
236 if (gdeleted || sdeleted)
237 return 0;
238 return psf->sf_count[MCAST_INCLUDE] != 0;
239 case IGMPV3_CHANGE_TO_EXCLUDE:
240 if (gdeleted || sdeleted)
241 return 0;
242 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
243 psf->sf_count[MCAST_INCLUDE])
244 return 0;
245 return pmc->sfcount[MCAST_EXCLUDE] ==
246 psf->sf_count[MCAST_EXCLUDE];
247 case IGMPV3_ALLOW_NEW_SOURCES:
248 if (gdeleted || !psf->sf_crcount)
249 return 0;
250 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
251 case IGMPV3_BLOCK_OLD_SOURCES:
252 if (pmc->sfmode == MCAST_INCLUDE)
253 return gdeleted || (psf->sf_crcount && sdeleted);
254 return psf->sf_crcount && !gdeleted && !sdeleted;
255 }
256 return 0;
257}
258
259static int
260igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
261{
262 struct ip_sf_list *psf;
263 int scount = 0;
264
265 for (psf=pmc->sources; psf; psf=psf->sf_next) {
266 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
267 continue;
268 scount++;
269 }
270 return scount;
271}
272
273static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
274{
275 struct sk_buff *skb;
276 struct rtable *rt;
277 struct iphdr *pip;
278 struct igmpv3_report *pig;
279
280 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
281 if (skb == NULL)
282 return NULL;
283
284 {
285 struct flowi fl = { .oif = dev->ifindex,
286 .nl_u = { .ip4_u = {
287 .daddr = IGMPV3_ALL_MCR } },
288 .proto = IPPROTO_IGMP };
289 if (ip_route_output_key(&rt, &fl)) {
290 kfree_skb(skb);
291 return NULL;
292 }
293 }
294 if (rt->rt_src == 0) {
295 kfree_skb(skb);
296 ip_rt_put(rt);
297 return NULL;
298 }
299
300 skb->dst = &rt->u.dst;
301 skb->dev = dev;
302
303 skb_reserve(skb, LL_RESERVED_SPACE(dev));
304
305 skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
306
307 pip->version = 4;
308 pip->ihl = (sizeof(struct iphdr)+4)>>2;
309 pip->tos = 0xc0;
310 pip->frag_off = htons(IP_DF);
311 pip->ttl = 1;
312 pip->daddr = rt->rt_dst;
313 pip->saddr = rt->rt_src;
314 pip->protocol = IPPROTO_IGMP;
315 pip->tot_len = 0; /* filled in later */
316 ip_select_ident(pip, &rt->u.dst, NULL);
317 ((u8*)&pip[1])[0] = IPOPT_RA;
318 ((u8*)&pip[1])[1] = 4;
319 ((u8*)&pip[1])[2] = 0;
320 ((u8*)&pip[1])[3] = 0;
321
322 pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig));
323 skb->h.igmph = (struct igmphdr *)pig;
324 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
325 pig->resv1 = 0;
326 pig->csum = 0;
327 pig->resv2 = 0;
328 pig->ngrec = 0;
329 return skb;
330}
331
332static int igmpv3_sendpack(struct sk_buff *skb)
333{
334 struct iphdr *pip = skb->nh.iph;
335 struct igmphdr *pig = skb->h.igmph;
336 int iplen, igmplen;
337
338 iplen = skb->tail - (unsigned char *)skb->nh.iph;
339 pip->tot_len = htons(iplen);
340 ip_send_check(pip);
341
342 igmplen = skb->tail - (unsigned char *)skb->h.igmph;
343 pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen);
344
345 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
346 dst_output);
347}
348
349static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
350{
351 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
352}
353
354static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
355 int type, struct igmpv3_grec **ppgr)
356{
357 struct net_device *dev = pmc->interface->dev;
358 struct igmpv3_report *pih;
359 struct igmpv3_grec *pgr;
360
361 if (!skb)
362 skb = igmpv3_newpack(dev, dev->mtu);
363 if (!skb)
364 return NULL;
365 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
366 pgr->grec_type = type;
367 pgr->grec_auxwords = 0;
368 pgr->grec_nsrcs = 0;
369 pgr->grec_mca = pmc->multiaddr;
370 pih = (struct igmpv3_report *)skb->h.igmph;
371 pih->ngrec = htons(ntohs(pih->ngrec)+1);
372 *ppgr = pgr;
373 return skb;
374}
375
376#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
377 skb_tailroom(skb)) : 0)
378
379static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
380 int type, int gdeleted, int sdeleted)
381{
382 struct net_device *dev = pmc->interface->dev;
383 struct igmpv3_report *pih;
384 struct igmpv3_grec *pgr = NULL;
385 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
386 int scount, first, isquery, truncate;
387
388 if (pmc->multiaddr == IGMP_ALL_HOSTS)
389 return skb;
390
391 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
392 type == IGMPV3_MODE_IS_EXCLUDE;
393 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
394 type == IGMPV3_CHANGE_TO_EXCLUDE;
395
396 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
397
398 if (!*psf_list) {
399 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
400 type == IGMPV3_BLOCK_OLD_SOURCES)
401 return skb;
402 if (pmc->crcount || isquery) {
403 /* make sure we have room for group header and at
404 * least one source.
405 */
406 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)+
407 sizeof(__u32)) {
408 igmpv3_sendpack(skb);
409 skb = NULL; /* add_grhead will get a new one */
410 }
411 skb = add_grhead(skb, pmc, type, &pgr);
412 }
413 return skb;
414 }
415 pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL;
416
417 /* EX and TO_EX get a fresh packet, if needed */
418 if (truncate) {
419 if (pih && pih->ngrec &&
420 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
421 if (skb)
422 igmpv3_sendpack(skb);
423 skb = igmpv3_newpack(dev, dev->mtu);
424 }
425 }
426 first = 1;
427 scount = 0;
428 psf_prev = NULL;
429 for (psf=*psf_list; psf; psf=psf_next) {
430 u32 *psrc;
431
432 psf_next = psf->sf_next;
433
434 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
435 psf_prev = psf;
436 continue;
437 }
438
439 /* clear marks on query responses */
440 if (isquery)
441 psf->sf_gsresp = 0;
442
443 if (AVAILABLE(skb) < sizeof(u32) +
444 first*sizeof(struct igmpv3_grec)) {
445 if (truncate && !first)
446 break; /* truncate these */
447 if (pgr)
448 pgr->grec_nsrcs = htons(scount);
449 if (skb)
450 igmpv3_sendpack(skb);
451 skb = igmpv3_newpack(dev, dev->mtu);
452 first = 1;
453 scount = 0;
454 }
455 if (first) {
456 skb = add_grhead(skb, pmc, type, &pgr);
457 first = 0;
458 }
459 psrc = (u32 *)skb_put(skb, sizeof(u32));
460 *psrc = psf->sf_inaddr;
461 scount++;
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 if (pgr)
477 pgr->grec_nsrcs = htons(scount);
478
479 if (isquery)
480 pmc->gsquery = 0; /* clear query state on report */
481 return skb;
482}
483
484static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
485{
486 struct sk_buff *skb = NULL;
487 int type;
488
489 if (!pmc) {
490 read_lock(&in_dev->mc_list_lock);
491 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
492 if (pmc->multiaddr == IGMP_ALL_HOSTS)
493 continue;
494 spin_lock_bh(&pmc->lock);
495 if (pmc->sfcount[MCAST_EXCLUDE])
496 type = IGMPV3_MODE_IS_EXCLUDE;
497 else
498 type = IGMPV3_MODE_IS_INCLUDE;
499 skb = add_grec(skb, pmc, type, 0, 0);
500 spin_unlock_bh(&pmc->lock);
501 }
502 read_unlock(&in_dev->mc_list_lock);
503 } else {
504 spin_lock_bh(&pmc->lock);
505 if (pmc->sfcount[MCAST_EXCLUDE])
506 type = IGMPV3_MODE_IS_EXCLUDE;
507 else
508 type = IGMPV3_MODE_IS_INCLUDE;
509 skb = add_grec(skb, pmc, type, 0, 0);
510 spin_unlock_bh(&pmc->lock);
511 }
512 if (!skb)
513 return 0;
514 return igmpv3_sendpack(skb);
515}
516
517/*
518 * remove zero-count source records from a source filter list
519 */
520static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
521{
522 struct ip_sf_list *psf_prev, *psf_next, *psf;
523
524 psf_prev = NULL;
525 for (psf=*ppsf; psf; psf = psf_next) {
526 psf_next = psf->sf_next;
527 if (psf->sf_crcount == 0) {
528 if (psf_prev)
529 psf_prev->sf_next = psf->sf_next;
530 else
531 *ppsf = psf->sf_next;
532 kfree(psf);
533 } else
534 psf_prev = psf;
535 }
536}
537
538static void igmpv3_send_cr(struct in_device *in_dev)
539{
540 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
541 struct sk_buff *skb = NULL;
542 int type, dtype;
543
544 read_lock(&in_dev->mc_list_lock);
545 spin_lock_bh(&in_dev->mc_tomb_lock);
546
547 /* deleted MCA's */
548 pmc_prev = NULL;
549 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
550 pmc_next = pmc->next;
551 if (pmc->sfmode == MCAST_INCLUDE) {
552 type = IGMPV3_BLOCK_OLD_SOURCES;
553 dtype = IGMPV3_BLOCK_OLD_SOURCES;
554 skb = add_grec(skb, pmc, type, 1, 0);
555 skb = add_grec(skb, pmc, dtype, 1, 1);
556 }
557 if (pmc->crcount) {
558 pmc->crcount--;
559 if (pmc->sfmode == MCAST_EXCLUDE) {
560 type = IGMPV3_CHANGE_TO_INCLUDE;
561 skb = add_grec(skb, pmc, type, 1, 0);
562 }
563 if (pmc->crcount == 0) {
564 igmpv3_clear_zeros(&pmc->tomb);
565 igmpv3_clear_zeros(&pmc->sources);
566 }
567 }
568 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
569 if (pmc_prev)
570 pmc_prev->next = pmc_next;
571 else
572 in_dev->mc_tomb = pmc_next;
573 in_dev_put(pmc->interface);
574 kfree(pmc);
575 } else
576 pmc_prev = pmc;
577 }
578 spin_unlock_bh(&in_dev->mc_tomb_lock);
579
580 /* change recs */
581 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
582 spin_lock_bh(&pmc->lock);
583 if (pmc->sfcount[MCAST_EXCLUDE]) {
584 type = IGMPV3_BLOCK_OLD_SOURCES;
585 dtype = IGMPV3_ALLOW_NEW_SOURCES;
586 } else {
587 type = IGMPV3_ALLOW_NEW_SOURCES;
588 dtype = IGMPV3_BLOCK_OLD_SOURCES;
589 }
590 skb = add_grec(skb, pmc, type, 0, 0);
591 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
592
593 /* filter mode changes */
594 if (pmc->crcount) {
595 pmc->crcount--;
596 if (pmc->sfmode == MCAST_EXCLUDE)
597 type = IGMPV3_CHANGE_TO_EXCLUDE;
598 else
599 type = IGMPV3_CHANGE_TO_INCLUDE;
600 skb = add_grec(skb, pmc, type, 0, 0);
601 }
602 spin_unlock_bh(&pmc->lock);
603 }
604 read_unlock(&in_dev->mc_list_lock);
605
606 if (!skb)
607 return;
608 (void) igmpv3_sendpack(skb);
609}
610
611static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
612 int type)
613{
614 struct sk_buff *skb;
615 struct iphdr *iph;
616 struct igmphdr *ih;
617 struct rtable *rt;
618 struct net_device *dev = in_dev->dev;
619 u32 group = pmc ? pmc->multiaddr : 0;
620 u32 dst;
621
622 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
623 return igmpv3_send_report(in_dev, pmc);
624 else if (type == IGMP_HOST_LEAVE_MESSAGE)
625 dst = IGMP_ALL_ROUTER;
626 else
627 dst = group;
628
629 {
630 struct flowi fl = { .oif = dev->ifindex,
631 .nl_u = { .ip4_u = { .daddr = dst } },
632 .proto = IPPROTO_IGMP };
633 if (ip_route_output_key(&rt, &fl))
634 return -1;
635 }
636 if (rt->rt_src == 0) {
637 ip_rt_put(rt);
638 return -1;
639 }
640
641 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
642 if (skb == NULL) {
643 ip_rt_put(rt);
644 return -1;
645 }
646
647 skb->dst = &rt->u.dst;
648
649 skb_reserve(skb, LL_RESERVED_SPACE(dev));
650
651 skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
652
653 iph->version = 4;
654 iph->ihl = (sizeof(struct iphdr)+4)>>2;
655 iph->tos = 0xc0;
656 iph->frag_off = htons(IP_DF);
657 iph->ttl = 1;
658 iph->daddr = dst;
659 iph->saddr = rt->rt_src;
660 iph->protocol = IPPROTO_IGMP;
661 iph->tot_len = htons(IGMP_SIZE);
662 ip_select_ident(iph, &rt->u.dst, NULL);
663 ((u8*)&iph[1])[0] = IPOPT_RA;
664 ((u8*)&iph[1])[1] = 4;
665 ((u8*)&iph[1])[2] = 0;
666 ((u8*)&iph[1])[3] = 0;
667 ip_send_check(iph);
668
669 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
670 ih->type=type;
671 ih->code=0;
672 ih->csum=0;
673 ih->group=group;
674 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
675
676 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
677 dst_output);
678}
679
680static void igmp_gq_timer_expire(unsigned long data)
681{
682 struct in_device *in_dev = (struct in_device *)data;
683
684 in_dev->mr_gq_running = 0;
685 igmpv3_send_report(in_dev, NULL);
686 __in_dev_put(in_dev);
687}
688
689static void igmp_ifc_timer_expire(unsigned long data)
690{
691 struct in_device *in_dev = (struct in_device *)data;
692
693 igmpv3_send_cr(in_dev);
694 if (in_dev->mr_ifc_count) {
695 in_dev->mr_ifc_count--;
696 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
697 }
698 __in_dev_put(in_dev);
699}
700
701static void igmp_ifc_event(struct in_device *in_dev)
702{
703 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
704 return;
705 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
706 IGMP_Unsolicited_Report_Count;
707 igmp_ifc_start_timer(in_dev, 1);
708}
709
710
711static void igmp_timer_expire(unsigned long data)
712{
713 struct ip_mc_list *im=(struct ip_mc_list *)data;
714 struct in_device *in_dev = im->interface;
715
716 spin_lock(&im->lock);
717 im->tm_running=0;
718
719 if (im->unsolicit_count) {
720 im->unsolicit_count--;
721 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
722 }
723 im->reporter = 1;
724 spin_unlock(&im->lock);
725
726 if (IGMP_V1_SEEN(in_dev))
727 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
728 else if (IGMP_V2_SEEN(in_dev))
729 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
730 else
731 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
732
733 ip_ma_put(im);
734}
735
736static void igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs)
737{
738 struct ip_sf_list *psf;
739 int i, scount;
740
741 scount = 0;
742 for (psf=pmc->sources; psf; psf=psf->sf_next) {
743 if (scount == nsrcs)
744 break;
745 for (i=0; i<nsrcs; i++)
746 if (srcs[i] == psf->sf_inaddr) {
747 psf->sf_gsresp = 1;
748 scount++;
749 break;
750 }
751 }
752}
753
754static void igmp_heard_report(struct in_device *in_dev, u32 group)
755{
756 struct ip_mc_list *im;
757
758 /* Timers are only set for non-local groups */
759
760 if (group == IGMP_ALL_HOSTS)
761 return;
762
763 read_lock(&in_dev->mc_list_lock);
764 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
765 if (im->multiaddr == group) {
766 igmp_stop_timer(im);
767 break;
768 }
769 }
770 read_unlock(&in_dev->mc_list_lock);
771}
772
773static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
774 int len)
775{
776 struct igmphdr *ih = skb->h.igmph;
777 struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
778 struct ip_mc_list *im;
779 u32 group = ih->group;
780 int max_delay;
781 int mark = 0;
782
783
784 if (len == 8) {
785 if (ih->code == 0) {
786 /* Alas, old v1 router presents here. */
787
788 max_delay = IGMP_Query_Response_Interval;
789 in_dev->mr_v1_seen = jiffies +
790 IGMP_V1_Router_Present_Timeout;
791 group = 0;
792 } else {
793 /* v2 router present */
794 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
795 in_dev->mr_v2_seen = jiffies +
796 IGMP_V2_Router_Present_Timeout;
797 }
798 /* cancel the interface change timer */
799 in_dev->mr_ifc_count = 0;
800 if (del_timer(&in_dev->mr_ifc_timer))
801 __in_dev_put(in_dev);
802 /* clear deleted report items */
803 igmpv3_clear_delrec(in_dev);
804 } else if (len < 12) {
805 return; /* ignore bogus packet; freed by caller */
806 } else { /* v3 */
807 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
808 return;
809
810 ih3 = (struct igmpv3_query *) skb->h.raw;
811 if (ih3->nsrcs) {
812 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
813 + ntohs(ih3->nsrcs)*sizeof(__u32)))
814 return;
815 ih3 = (struct igmpv3_query *) skb->h.raw;
816 }
817
818 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
819 if (!max_delay)
820 max_delay = 1; /* can't mod w/ 0 */
821 in_dev->mr_maxdelay = max_delay;
822 if (ih3->qrv)
823 in_dev->mr_qrv = ih3->qrv;
824 if (!group) { /* general query */
825 if (ih3->nsrcs)
826 return; /* no sources allowed */
827 igmp_gq_start_timer(in_dev);
828 return;
829 }
830 /* mark sources to include, if group & source-specific */
831 mark = ih3->nsrcs != 0;
832 }
833
834 /*
835 * - Start the timers in all of our membership records
836 * that the query applies to for the interface on
837 * which the query arrived excl. those that belong
838 * to a "local" group (224.0.0.X)
839 * - For timers already running check if they need to
840 * be reset.
841 * - Use the igmp->igmp_code field as the maximum
842 * delay possible
843 */
844 read_lock(&in_dev->mc_list_lock);
845 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
846 if (group && group != im->multiaddr)
847 continue;
848 if (im->multiaddr == IGMP_ALL_HOSTS)
849 continue;
850 spin_lock_bh(&im->lock);
851 if (im->tm_running)
852 im->gsquery = im->gsquery && mark;
853 else
854 im->gsquery = mark;
855 if (im->gsquery)
856 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
857 spin_unlock_bh(&im->lock);
858 igmp_mod_timer(im, max_delay);
859 }
860 read_unlock(&in_dev->mc_list_lock);
861}
862
863int igmp_rcv(struct sk_buff *skb)
864{
865 /* This basically follows the spec line by line -- see RFC1112 */
866 struct igmphdr *ih;
867 struct in_device *in_dev = in_dev_get(skb->dev);
868 int len = skb->len;
869
870 if (in_dev==NULL) {
871 kfree_skb(skb);
872 return 0;
873 }
874
fb286bb2
HX		 875 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
876 goto drop;
877
878 switch (skb->ip_summed) {
879 case CHECKSUM_HW:
880 if (!(u16)csum_fold(skb->csum))
881 break;
882 /* fall through */
883 case CHECKSUM_NONE:
884 skb->csum = 0;
885 if (__skb_checksum_complete(skb))
886 goto drop;
1da177e4
LT		 887 }
888
889 ih = skb->h.igmph;
890 switch (ih->type) {
891 case IGMP_HOST_MEMBERSHIP_QUERY:
892 igmp_heard_query(in_dev, skb, len);
893 break;
894 case IGMP_HOST_MEMBERSHIP_REPORT:
895 case IGMPV2_HOST_MEMBERSHIP_REPORT:
896 case IGMPV3_HOST_MEMBERSHIP_REPORT:
897 /* Is it our report looped back? */
898 if (((struct rtable*)skb->dst)->fl.iif == 0)
899 break;
24c69275
DS		 900 /* don't rely on MC router hearing unicast reports */
901 if (skb->pkt_type == PACKET_MULTICAST ||
902 skb->pkt_type == PACKET_BROADCAST)
903 igmp_heard_report(in_dev, ih->group);
1da177e4
LT		 904 break;
905 case IGMP_PIM:
906#ifdef CONFIG_IP_PIMSM_V1
907 in_dev_put(in_dev);
908 return pim_rcv_v1(skb);
909#endif
910 case IGMP_DVMRP:
911 case IGMP_TRACE:
912 case IGMP_HOST_LEAVE_MESSAGE:
913 case IGMP_MTRACE:
914 case IGMP_MTRACE_RESP:
915 break;
916 default:
64ce2073 917 NETDEBUG(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type);
1da177e4 918 }
fb286bb2
HX		 919
920drop:
1da177e4
LT		 921 in_dev_put(in_dev);
922 kfree_skb(skb);
923 return 0;
924}
925
926#endif
927
928
929/*
930 * Add a filter to a device
931 */
932
933static void ip_mc_filter_add(struct in_device *in_dev, u32 addr)
934{
935 char buf[MAX_ADDR_LEN];
936 struct net_device *dev = in_dev->dev;
937
938 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
939 We will get multicast token leakage, when IFF_MULTICAST
940 is changed. This check should be done in dev->set_multicast_list
941 routine. Something sort of:
942 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
943 --ANK
944 */
945 if (arp_mc_map(addr, buf, dev, 0) == 0)
946 dev_mc_add(dev,buf,dev->addr_len,0);
947}
948
949/*
950 * Remove a filter from a device
951 */
952
953static void ip_mc_filter_del(struct in_device *in_dev, u32 addr)
954{
955 char buf[MAX_ADDR_LEN];
956 struct net_device *dev = in_dev->dev;
957
958 if (arp_mc_map(addr, buf, dev, 0) == 0)
959 dev_mc_delete(dev,buf,dev->addr_len,0);
960}
961
962#ifdef CONFIG_IP_MULTICAST
963/*
964 * deleted ip_mc_list manipulation
965 */
966static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
967{
968 struct ip_mc_list *pmc;
969
970 /* this is an "ip_mc_list" for convenience; only the fields below
971 * are actually used. In particular, the refcnt and users are not
972 * used for management of the delete list. Using the same structure
973 * for deleted items allows change reports to use common code with
974 * non-deleted or query-response MCA's.
975 */
976 pmc = (struct ip_mc_list *)kmalloc(sizeof(*pmc), GFP_KERNEL);
977 if (!pmc)
978 return;
979 memset(pmc, 0, sizeof(*pmc));
980 spin_lock_bh(&im->lock);
981 pmc->interface = im->interface;
982 in_dev_hold(in_dev);
983 pmc->multiaddr = im->multiaddr;
984 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
985 IGMP_Unsolicited_Report_Count;
986 pmc->sfmode = im->sfmode;
987 if (pmc->sfmode == MCAST_INCLUDE) {
988 struct ip_sf_list *psf;
989
990 pmc->tomb = im->tomb;
991 pmc->sources = im->sources;
992 im->tomb = im->sources = NULL;
993 for (psf=pmc->sources; psf; psf=psf->sf_next)
994 psf->sf_crcount = pmc->crcount;
995 }
996 spin_unlock_bh(&im->lock);
997
998 spin_lock_bh(&in_dev->mc_tomb_lock);
999 pmc->next = in_dev->mc_tomb;
1000 in_dev->mc_tomb = pmc;
1001 spin_unlock_bh(&in_dev->mc_tomb_lock);
1002}
1003
1004static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr)
1005{
1006 struct ip_mc_list *pmc, *pmc_prev;
1007 struct ip_sf_list *psf, *psf_next;
1008
1009 spin_lock_bh(&in_dev->mc_tomb_lock);
1010 pmc_prev = NULL;
1011 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1012 if (pmc->multiaddr == multiaddr)
1013 break;
1014 pmc_prev = pmc;
1015 }
1016 if (pmc) {
1017 if (pmc_prev)
1018 pmc_prev->next = pmc->next;
1019 else
1020 in_dev->mc_tomb = pmc->next;
1021 }
1022 spin_unlock_bh(&in_dev->mc_tomb_lock);
1023 if (pmc) {
1024 for (psf=pmc->tomb; psf; psf=psf_next) {
1025 psf_next = psf->sf_next;
1026 kfree(psf);
1027 }
1028 in_dev_put(pmc->interface);
1029 kfree(pmc);
1030 }
1031}
1032
1033static void igmpv3_clear_delrec(struct in_device *in_dev)
1034{
1035 struct ip_mc_list *pmc, *nextpmc;
1036
1037 spin_lock_bh(&in_dev->mc_tomb_lock);
1038 pmc = in_dev->mc_tomb;
1039 in_dev->mc_tomb = NULL;
1040 spin_unlock_bh(&in_dev->mc_tomb_lock);
1041
1042 for (; pmc; pmc = nextpmc) {
1043 nextpmc = pmc->next;
1044 ip_mc_clear_src(pmc);
1045 in_dev_put(pmc->interface);
1046 kfree(pmc);
1047 }
1048 /* clear dead sources, too */
1049 read_lock(&in_dev->mc_list_lock);
1050 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1051 struct ip_sf_list *psf, *psf_next;
1052
1053 spin_lock_bh(&pmc->lock);
1054 psf = pmc->tomb;
1055 pmc->tomb = NULL;
1056 spin_unlock_bh(&pmc->lock);
1057 for (; psf; psf=psf_next) {
1058 psf_next = psf->sf_next;
1059 kfree(psf);
1060 }
1061 }
1062 read_unlock(&in_dev->mc_list_lock);
1063}
1064#endif
1065
1066static void igmp_group_dropped(struct ip_mc_list *im)
1067{
1068 struct in_device *in_dev = im->interface;
1069#ifdef CONFIG_IP_MULTICAST
1070 int reporter;
1071#endif
1072
1073 if (im->loaded) {
1074 im->loaded = 0;
1075 ip_mc_filter_del(in_dev, im->multiaddr);
1076 }
1077
1078#ifdef CONFIG_IP_MULTICAST
1079 if (im->multiaddr == IGMP_ALL_HOSTS)
1080 return;
1081
1082 reporter = im->reporter;
1083 igmp_stop_timer(im);
1084
1085 if (!in_dev->dead) {
1086 if (IGMP_V1_SEEN(in_dev))
1087 goto done;
1088 if (IGMP_V2_SEEN(in_dev)) {
1089 if (reporter)
1090 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1091 goto done;
1092 }
1093 /* IGMPv3 */
1094 igmpv3_add_delrec(in_dev, im);
1095
1096 igmp_ifc_event(in_dev);
1097 }
1098done:
1099#endif
1100 ip_mc_clear_src(im);
1101}
1102
1103static void igmp_group_added(struct ip_mc_list *im)
1104{
1105 struct in_device *in_dev = im->interface;
1106
1107 if (im->loaded == 0) {
1108 im->loaded = 1;
1109 ip_mc_filter_add(in_dev, im->multiaddr);
1110 }
1111
1112#ifdef CONFIG_IP_MULTICAST
1113 if (im->multiaddr == IGMP_ALL_HOSTS)
1114 return;
1115
1116 if (in_dev->dead)
1117 return;
1118 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1119 spin_lock_bh(&im->lock);
1120 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1121 spin_unlock_bh(&im->lock);
1122 return;
1123 }
1124 /* else, v3 */
1125
1126 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1127 IGMP_Unsolicited_Report_Count;
1128 igmp_ifc_event(in_dev);
1129#endif
1130}
1131
1132
1133/*
1134 * Multicast list managers
1135 */
1136
1137
1138/*
1139 * A socket has joined a multicast group on device dev.
1140 */
1141
1142void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
1143{
1144 struct ip_mc_list *im;
1145
1146 ASSERT_RTNL();
1147
1148 for (im=in_dev->mc_list; im; im=im->next) {
1149 if (im->multiaddr == addr) {
1150 im->users++;
1151 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1152 goto out;
1153 }
1154 }
1155
1156 im = (struct ip_mc_list *)kmalloc(sizeof(*im), GFP_KERNEL);
1157 if (!im)
1158 goto out;
1159
1160 im->users=1;
1161 im->interface=in_dev;
1162 in_dev_hold(in_dev);
1163 im->multiaddr=addr;
1164 /* initial mode is (EX, empty) */
1165 im->sfmode = MCAST_EXCLUDE;
1166 im->sfcount[MCAST_INCLUDE] = 0;
1167 im->sfcount[MCAST_EXCLUDE] = 1;
1168 im->sources = NULL;
1169 im->tomb = NULL;
1170 im->crcount = 0;
1171 atomic_set(&im->refcnt, 1);
1172 spin_lock_init(&im->lock);
1173#ifdef CONFIG_IP_MULTICAST
1174 im->tm_running=0;
1175 init_timer(&im->timer);
1176 im->timer.data=(unsigned long)im;
1177 im->timer.function=&igmp_timer_expire;
1178 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1179 im->reporter = 0;
1180 im->gsquery = 0;
1181#endif
1182 im->loaded = 0;
1183 write_lock_bh(&in_dev->mc_list_lock);
1184 im->next=in_dev->mc_list;
1185 in_dev->mc_list=im;
1186 write_unlock_bh(&in_dev->mc_list_lock);
1187#ifdef CONFIG_IP_MULTICAST
1188 igmpv3_del_delrec(in_dev, im->multiaddr);
1189#endif
1190 igmp_group_added(im);
1191 if (!in_dev->dead)
1192 ip_rt_multicast_event(in_dev);
1193out:
1194 return;
1195}
1196
1197/*
1198 * A socket has left a multicast group on device dev
1199 */
1200
1201void ip_mc_dec_group(struct in_device *in_dev, u32 addr)
1202{
1203 struct ip_mc_list *i, **ip;
1204
1205 ASSERT_RTNL();
1206
1207 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1208 if (i->multiaddr==addr) {
1209 if (--i->users == 0) {
1210 write_lock_bh(&in_dev->mc_list_lock);
1211 *ip = i->next;
1212 write_unlock_bh(&in_dev->mc_list_lock);
1213 igmp_group_dropped(i);
1214
1215 if (!in_dev->dead)
1216 ip_rt_multicast_event(in_dev);
1217
1218 ip_ma_put(i);
1219 return;
1220 }
1221 break;
1222 }
1223 }
1224}
1225
1226/* Device going down */
1227
1228void ip_mc_down(struct in_device *in_dev)
1229{
1230 struct ip_mc_list *i;
1231
1232 ASSERT_RTNL();
1233
1234 for (i=in_dev->mc_list; i; i=i->next)
1235 igmp_group_dropped(i);
1236
1237#ifdef CONFIG_IP_MULTICAST
1238 in_dev->mr_ifc_count = 0;
1239 if (del_timer(&in_dev->mr_ifc_timer))
1240 __in_dev_put(in_dev);
1241 in_dev->mr_gq_running = 0;
1242 if (del_timer(&in_dev->mr_gq_timer))
1243 __in_dev_put(in_dev);
1244 igmpv3_clear_delrec(in_dev);
1245#endif
1246
1247 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1248}
1249
1250void ip_mc_init_dev(struct in_device *in_dev)
1251{
1252 ASSERT_RTNL();
1253
1254 in_dev->mc_tomb = NULL;
1255#ifdef CONFIG_IP_MULTICAST
1256 in_dev->mr_gq_running = 0;
1257 init_timer(&in_dev->mr_gq_timer);
1258 in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1259 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1260 in_dev->mr_ifc_count = 0;
1261 init_timer(&in_dev->mr_ifc_timer);
1262 in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1263 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1264 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1265#endif
1266
1267 rwlock_init(&in_dev->mc_list_lock);
1268 spin_lock_init(&in_dev->mc_tomb_lock);
1269}
1270
1271/* Device going up */
1272
1273void ip_mc_up(struct in_device *in_dev)
1274{
1275 struct ip_mc_list *i;
1276
1277 ASSERT_RTNL();
1278
1279 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1280
1281 for (i=in_dev->mc_list; i; i=i->next)
1282 igmp_group_added(i);
1283}
1284
1285/*
1286 * Device is about to be destroyed: clean up.
1287 */
1288
1289void ip_mc_destroy_dev(struct in_device *in_dev)
1290{
1291 struct ip_mc_list *i;
1292
1293 ASSERT_RTNL();
1294
1295 /* Deactivate timers */
1296 ip_mc_down(in_dev);
1297
1298 write_lock_bh(&in_dev->mc_list_lock);
1299 while ((i = in_dev->mc_list) != NULL) {
1300 in_dev->mc_list = i->next;
1301 write_unlock_bh(&in_dev->mc_list_lock);
1302
1303 igmp_group_dropped(i);
1304 ip_ma_put(i);
1305
1306 write_lock_bh(&in_dev->mc_list_lock);
1307 }
1308 write_unlock_bh(&in_dev->mc_list_lock);
1309}
1310
1311static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1312{
1313 struct flowi fl = { .nl_u = { .ip4_u =
1314 { .daddr = imr->imr_multiaddr.s_addr } } };
1315 struct rtable *rt;
1316 struct net_device *dev = NULL;
1317 struct in_device *idev = NULL;
1318
1319 if (imr->imr_ifindex) {
1320 idev = inetdev_by_index(imr->imr_ifindex);
1321 if (idev)
1322 __in_dev_put(idev);
1323 return idev;
1324 }
1325 if (imr->imr_address.s_addr) {
1326 dev = ip_dev_find(imr->imr_address.s_addr);
1327 if (!dev)
1328 return NULL;
1329 __dev_put(dev);
1330 }
1331
1332 if (!dev && !ip_route_output_key(&rt, &fl)) {
1333 dev = rt->u.dst.dev;
1334 ip_rt_put(rt);
1335 }
1336 if (dev) {
1337 imr->imr_ifindex = dev->ifindex;
e5ed6399 1338 idev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1339 }
1340 return idev;
1341}
1342
1343/*
1344 * Join a socket to a group
1345 */
1346int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS;
1347int sysctl_igmp_max_msf = IP_MAX_MSF;
1348
1349
1350static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1351 __u32 *psfsrc)
1352{
1353 struct ip_sf_list *psf, *psf_prev;
1354 int rv = 0;
1355
1356 psf_prev = NULL;
1357 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1358 if (psf->sf_inaddr == *psfsrc)
1359 break;
1360 psf_prev = psf;
1361 }
1362 if (!psf || psf->sf_count[sfmode] == 0) {
1363 /* source filter not found, or count wrong => bug */
1364 return -ESRCH;
1365 }
1366 psf->sf_count[sfmode]--;
1367 if (psf->sf_count[sfmode] == 0) {
1368 ip_rt_multicast_event(pmc->interface);
1369 }
1370 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1371#ifdef CONFIG_IP_MULTICAST
1372 struct in_device *in_dev = pmc->interface;
1373#endif
1374
1375 /* no more filters for this source */
1376 if (psf_prev)
1377 psf_prev->sf_next = psf->sf_next;
1378 else
1379 pmc->sources = psf->sf_next;
1380#ifdef CONFIG_IP_MULTICAST
1381 if (psf->sf_oldin &&
1382 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1383 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1384 IGMP_Unsolicited_Report_Count;
1385 psf->sf_next = pmc->tomb;
1386 pmc->tomb = psf;
1387 rv = 1;
1388 } else
1389#endif
1390 kfree(psf);
1391 }
1392 return rv;
1393}
1394
1395#ifndef CONFIG_IP_MULTICAST
1396#define igmp_ifc_event(x) do { } while (0)
1397#endif
1398
1399static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1400 int sfcount, __u32 *psfsrc, int delta)
1401{
1402 struct ip_mc_list *pmc;
1403 int changerec = 0;
1404 int i, err;
1405
1406 if (!in_dev)
1407 return -ENODEV;
1408 read_lock(&in_dev->mc_list_lock);
1409 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1410 if (*pmca == pmc->multiaddr)
1411 break;
1412 }
1413 if (!pmc) {
1414 /* MCA not found?? bug */
1415 read_unlock(&in_dev->mc_list_lock);
1416 return -ESRCH;
1417 }
1418 spin_lock_bh(&pmc->lock);
1419 read_unlock(&in_dev->mc_list_lock);
1420#ifdef CONFIG_IP_MULTICAST
1421 sf_markstate(pmc);
1422#endif
1423 if (!delta) {
1424 err = -EINVAL;
1425 if (!pmc->sfcount[sfmode])
1426 goto out_unlock;
1427 pmc->sfcount[sfmode]--;
1428 }
1429 err = 0;
1430 for (i=0; i<sfcount; i++) {
1431 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1432
1433 changerec |= rv > 0;
1434 if (!err && rv < 0)
1435 err = rv;
1436 }
1437 if (pmc->sfmode == MCAST_EXCLUDE &&
1438 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1439 pmc->sfcount[MCAST_INCLUDE]) {
1440#ifdef CONFIG_IP_MULTICAST
1441 struct ip_sf_list *psf;
1442#endif
1443
1444 /* filter mode change */
1445 pmc->sfmode = MCAST_INCLUDE;
1446#ifdef CONFIG_IP_MULTICAST
1447 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1448 IGMP_Unsolicited_Report_Count;
1449 in_dev->mr_ifc_count = pmc->crcount;
1450 for (psf=pmc->sources; psf; psf = psf->sf_next)
1451 psf->sf_crcount = 0;
1452 igmp_ifc_event(pmc->interface);
1453 } else if (sf_setstate(pmc) || changerec) {
1454 igmp_ifc_event(pmc->interface);
1455#endif
1456 }
1457out_unlock:
1458 spin_unlock_bh(&pmc->lock);
1459 return err;
1460}
1461
1462/*
1463 * Add multicast single-source filter to the interface list
1464 */
1465static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1466 __u32 *psfsrc, int delta)
1467{
1468 struct ip_sf_list *psf, *psf_prev;
1469
1470 psf_prev = NULL;
1471 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1472 if (psf->sf_inaddr == *psfsrc)
1473 break;
1474 psf_prev = psf;
1475 }
1476 if (!psf) {
1477 psf = (struct ip_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1478 if (!psf)
1479 return -ENOBUFS;
1480 memset(psf, 0, sizeof(*psf));
1481 psf->sf_inaddr = *psfsrc;
1482 if (psf_prev) {
1483 psf_prev->sf_next = psf;
1484 } else
1485 pmc->sources = psf;
1486 }
1487 psf->sf_count[sfmode]++;
1488 if (psf->sf_count[sfmode] == 1) {
1489 ip_rt_multicast_event(pmc->interface);
1490 }
1491 return 0;
1492}
1493
1494#ifdef CONFIG_IP_MULTICAST
1495static void sf_markstate(struct ip_mc_list *pmc)
1496{
1497 struct ip_sf_list *psf;
1498 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1499
1500 for (psf=pmc->sources; psf; psf=psf->sf_next)
1501 if (pmc->sfcount[MCAST_EXCLUDE]) {
1502 psf->sf_oldin = mca_xcount ==
1503 psf->sf_count[MCAST_EXCLUDE] &&
1504 !psf->sf_count[MCAST_INCLUDE];
1505 } else
1506 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1507}
1508
1509static int sf_setstate(struct ip_mc_list *pmc)
1510{
1511 struct ip_sf_list *psf;
1512 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1513 int qrv = pmc->interface->mr_qrv;
1514 int new_in, rv;
1515
1516 rv = 0;
1517 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1518 if (pmc->sfcount[MCAST_EXCLUDE]) {
1519 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1520 !psf->sf_count[MCAST_INCLUDE];
1521 } else
1522 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1523 if (new_in != psf->sf_oldin) {
1524 psf->sf_crcount = qrv;
1525 rv++;
1526 }
1527 }
1528 return rv;
1529}
1530#endif
1531
1532/*
1533 * Add multicast source filter list to the interface list
1534 */
1535static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1536 int sfcount, __u32 *psfsrc, int delta)
1537{
1538 struct ip_mc_list *pmc;
1539 int isexclude;
1540 int i, err;
1541
1542 if (!in_dev)
1543 return -ENODEV;
1544 read_lock(&in_dev->mc_list_lock);
1545 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1546 if (*pmca == pmc->multiaddr)
1547 break;
1548 }
1549 if (!pmc) {
1550 /* MCA not found?? bug */
1551 read_unlock(&in_dev->mc_list_lock);
1552 return -ESRCH;
1553 }
1554 spin_lock_bh(&pmc->lock);
1555 read_unlock(&in_dev->mc_list_lock);
1556
1557#ifdef CONFIG_IP_MULTICAST
1558 sf_markstate(pmc);
1559#endif
1560 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1561 if (!delta)
1562 pmc->sfcount[sfmode]++;
1563 err = 0;
1564 for (i=0; i<sfcount; i++) {
1565 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1566 if (err)
1567 break;
1568 }
1569 if (err) {
1570 int j;
1571
1572 pmc->sfcount[sfmode]--;
1573 for (j=0; j<i; j++)
1574 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1575 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1576#ifdef CONFIG_IP_MULTICAST
1577 struct in_device *in_dev = pmc->interface;
1578 struct ip_sf_list *psf;
1579#endif
1580
1581 /* filter mode change */
1582 if (pmc->sfcount[MCAST_EXCLUDE])
1583 pmc->sfmode = MCAST_EXCLUDE;
1584 else if (pmc->sfcount[MCAST_INCLUDE])
1585 pmc->sfmode = MCAST_INCLUDE;
1586#ifdef CONFIG_IP_MULTICAST
1587 /* else no filters; keep old mode for reports */
1588
1589 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1590 IGMP_Unsolicited_Report_Count;
1591 in_dev->mr_ifc_count = pmc->crcount;
1592 for (psf=pmc->sources; psf; psf = psf->sf_next)
1593 psf->sf_crcount = 0;
1594 igmp_ifc_event(in_dev);
1595 } else if (sf_setstate(pmc)) {
1596 igmp_ifc_event(in_dev);
1597#endif
1598 }
1599 spin_unlock_bh(&pmc->lock);
1600 return err;
1601}
1602
1603static void ip_mc_clear_src(struct ip_mc_list *pmc)
1604{
1605 struct ip_sf_list *psf, *nextpsf;
1606
1607 for (psf=pmc->tomb; psf; psf=nextpsf) {
1608 nextpsf = psf->sf_next;
1609 kfree(psf);
1610 }
1611 pmc->tomb = NULL;
1612 for (psf=pmc->sources; psf; psf=nextpsf) {
1613 nextpsf = psf->sf_next;
1614 kfree(psf);
1615 }
1616 pmc->sources = NULL;
1617 pmc->sfmode = MCAST_EXCLUDE;
de9daad9 1618 pmc->sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1619 pmc->sfcount[MCAST_EXCLUDE] = 1;
1620}
1621
1622
1623/*
1624 * Join a multicast group
1625 */
1626int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1627{
1628 int err;
1629 u32 addr = imr->imr_multiaddr.s_addr;
ca9b907d 1630 struct ip_mc_socklist *iml=NULL, *i;
1da177e4
LT		 1631 struct in_device *in_dev;
1632 struct inet_sock *inet = inet_sk(sk);
ca9b907d 1633 int ifindex;
1da177e4
LT		 1634 int count = 0;
1635
1636 if (!MULTICAST(addr))
1637 return -EINVAL;
1638
1639 rtnl_shlock();
1640
1641 in_dev = ip_mc_find_dev(imr);
1642
1643 if (!in_dev) {
1644 iml = NULL;
1645 err = -ENODEV;
1646 goto done;
1647 }
1648
1da177e4 1649 err = -EADDRINUSE;
ca9b907d 1650 ifindex = imr->imr_ifindex;
1da177e4 1651 for (i = inet->mc_list; i; i = i->next) {
ca9b907d
DS		 1652 if (i->multi.imr_multiaddr.s_addr == addr &&
1653 i->multi.imr_ifindex == ifindex)
1da177e4 1654 goto done;
1da177e4
LT		 1655 count++;
1656 }
1657 err = -ENOBUFS;
ca9b907d
DS		 1658 if (count >= sysctl_igmp_max_memberships)
1659 goto done;
1660 iml = (struct ip_mc_socklist *)sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1661 if (iml == NULL)
1da177e4 1662 goto done;
ca9b907d 1663
1da177e4
LT		 1664 memcpy(&iml->multi, imr, sizeof(*imr));
1665 iml->next = inet->mc_list;
1da177e4
LT		 1666 iml->sflist = NULL;
1667 iml->sfmode = MCAST_EXCLUDE;
1668 inet->mc_list = iml;
1669 ip_mc_inc_group(in_dev, addr);
1da177e4 1670 err = 0;
1da177e4
LT		 1671done:
1672 rtnl_shunlock();
1da177e4
LT		 1673 return err;
1674}
1675
1676static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1677 struct in_device *in_dev)
1678{
1679 int err;
1680
1681 if (iml->sflist == 0) {
1682 /* any-source empty exclude case */
1683 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1684 iml->sfmode, 0, NULL, 0);
1685 }
1686 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1687 iml->sfmode, iml->sflist->sl_count,
1688 iml->sflist->sl_addr, 0);
1689 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1690 iml->sflist = NULL;
1691 return err;
1692}
1693
1694/*
1695 * Ask a socket to leave a group.
1696 */
1697
1698int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1699{
1700 struct inet_sock *inet = inet_sk(sk);
1701 struct ip_mc_socklist *iml, **imlp;
84b42bae
DS		 1702 struct in_device *in_dev;
1703 u32 group = imr->imr_multiaddr.s_addr;
1704 u32 ifindex;
1da177e4
LT		 1705
1706 rtnl_lock();
84b42bae
DS		 1707 in_dev = ip_mc_find_dev(imr);
1708 if (!in_dev) {
1709 rtnl_unlock();
1710 return -ENODEV;
1711 }
1712 ifindex = imr->imr_ifindex;
1da177e4 1713 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
84b42bae
DS		 1714 if (iml->multi.imr_multiaddr.s_addr == group &&
1715 iml->multi.imr_ifindex == ifindex) {
1716 (void) ip_mc_leave_src(sk, iml, in_dev);
1da177e4
LT		 1717
1718 *imlp = iml->next;
1719
84b42bae 1720 ip_mc_dec_group(in_dev, group);
1da177e4
LT		 1721 rtnl_unlock();
1722 sock_kfree_s(sk, iml, sizeof(*iml));
1723 return 0;
1724 }
1725 }
1726 rtnl_unlock();
1727 return -EADDRNOTAVAIL;
1728}
1729
1730int ip_mc_source(int add, int omode, struct sock *sk, struct
1731 ip_mreq_source *mreqs, int ifindex)
1732{
1733 int err;
1734 struct ip_mreqn imr;
1735 u32 addr = mreqs->imr_multiaddr;
1736 struct ip_mc_socklist *pmc;
1737 struct in_device *in_dev = NULL;
1738 struct inet_sock *inet = inet_sk(sk);
1739 struct ip_sf_socklist *psl;
8cdaaa15 1740 int leavegroup = 0;
1da177e4
LT		 1741 int i, j, rv;
1742
1743 if (!MULTICAST(addr))
1744 return -EINVAL;
1745
1746 rtnl_shlock();
1747
1748 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1749 imr.imr_address.s_addr = mreqs->imr_interface;
1750 imr.imr_ifindex = ifindex;
1751 in_dev = ip_mc_find_dev(&imr);
1752
1753 if (!in_dev) {
1754 err = -ENODEV;
1755 goto done;
1756 }
1757 err = -EADDRNOTAVAIL;
1758
1759 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
ca9b907d
DS		 1760 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1761 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1da177e4
LT		 1762 break;
1763 }
917f2f10
DS		 1764 if (!pmc) { /* must have a prior join */
1765 err = -EINVAL;
1da177e4 1766 goto done;
917f2f10 1767 }
1da177e4
LT		 1768 /* if a source filter was set, must be the same mode as before */
1769 if (pmc->sflist) {
917f2f10
DS		 1770 if (pmc->sfmode != omode) {
1771 err = -EINVAL;
1da177e4 1772 goto done;
917f2f10 1773 }
1da177e4
LT		 1774 } else if (pmc->sfmode != omode) {
1775 /* allow mode switches for empty-set filters */
1776 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1777 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1778 NULL, 0);
1779 pmc->sfmode = omode;
1780 }
1781
1782 psl = pmc->sflist;
1783 if (!add) {
1784 if (!psl)
917f2f10 1785 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 1786 rv = !0;
1787 for (i=0; i<psl->sl_count; i++) {
1788 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1789 sizeof(__u32));
1790 if (rv == 0)
1791 break;
1792 }
1793 if (rv) /* source not found */
917f2f10 1794 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 1795
8cdaaa15
DS		 1796 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1797 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1798 leavegroup = 1;
1799 goto done;
1800 }
1801
1da177e4
LT		 1802 /* update the interface filter */
1803 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1804 &mreqs->imr_sourceaddr, 1);
1805
1806 for (j=i+1; j<psl->sl_count; j++)
1807 psl->sl_addr[j-1] = psl->sl_addr[j];
1808 psl->sl_count--;
1809 err = 0;
1810 goto done;
1811 }
1812 /* else, add a new source to the filter */
1813
1814 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1815 err = -ENOBUFS;
1816 goto done;
1817 }
1818 if (!psl || psl->sl_count == psl->sl_max) {
1819 struct ip_sf_socklist *newpsl;
1820 int count = IP_SFBLOCK;
1821
1822 if (psl)
1823 count += psl->sl_max;
1824 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk,
1825 IP_SFLSIZE(count), GFP_KERNEL);
1826 if (!newpsl) {
1827 err = -ENOBUFS;
1828 goto done;
1829 }
1830 newpsl->sl_max = count;
1831 newpsl->sl_count = count - IP_SFBLOCK;
1832 if (psl) {
1833 for (i=0; i<psl->sl_count; i++)
1834 newpsl->sl_addr[i] = psl->sl_addr[i];
1835 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1836 }
1837 pmc->sflist = psl = newpsl;
1838 }
1839 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1840 for (i=0; i<psl->sl_count; i++) {
1841 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1842 sizeof(__u32));
1843 if (rv == 0)
1844 break;
1845 }
1846 if (rv == 0) /* address already there is an error */
1847 goto done;
1848 for (j=psl->sl_count-1; j>=i; j--)
1849 psl->sl_addr[j+1] = psl->sl_addr[j];
1850 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1851 psl->sl_count++;
1852 err = 0;
1853 /* update the interface list */
1854 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1855 &mreqs->imr_sourceaddr, 1);
1856done:
1857 rtnl_shunlock();
8cdaaa15
DS		 1858 if (leavegroup)
1859 return ip_mc_leave_group(sk, &imr);
1da177e4
LT		 1860 return err;
1861}
1862
1863int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1864{
9951f036 1865 int err = 0;
1da177e4
LT		 1866 struct ip_mreqn imr;
1867 u32 addr = msf->imsf_multiaddr;
1868 struct ip_mc_socklist *pmc;
1869 struct in_device *in_dev;
1870 struct inet_sock *inet = inet_sk(sk);
1871 struct ip_sf_socklist *newpsl, *psl;
9951f036 1872 int leavegroup = 0;
1da177e4
LT		 1873
1874 if (!MULTICAST(addr))
1875 return -EINVAL;
1876 if (msf->imsf_fmode != MCAST_INCLUDE &&
1877 msf->imsf_fmode != MCAST_EXCLUDE)
1878 return -EINVAL;
1879
1880 rtnl_shlock();
1881
1882 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1883 imr.imr_address.s_addr = msf->imsf_interface;
1884 imr.imr_ifindex = ifindex;
1885 in_dev = ip_mc_find_dev(&imr);
1886
1887 if (!in_dev) {
1888 err = -ENODEV;
1889 goto done;
1890 }
1da177e4 1891
9951f036
DS		 1892 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1893 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
1894 leavegroup = 1;
1895 goto done;
1896 }
1897
1da177e4
LT		 1898 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1899 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1900 pmc->multi.imr_ifindex == imr.imr_ifindex)
1901 break;
1902 }
917f2f10
DS		 1903 if (!pmc) { /* must have a prior join */
1904 err = -EINVAL;
1da177e4 1905 goto done;
917f2f10 1906 }
1da177e4
LT		 1907 if (msf->imsf_numsrc) {
1908 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk,
1909 IP_SFLSIZE(msf->imsf_numsrc), GFP_KERNEL);
1910 if (!newpsl) {
1911 err = -ENOBUFS;
1912 goto done;
1913 }
1914 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
1915 memcpy(newpsl->sl_addr, msf->imsf_slist,
1916 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
1917 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1918 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
1919 if (err) {
1920 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
1921 goto done;
1922 }
8713dbf0 1923 } else {
1da177e4 1924 newpsl = NULL;
8713dbf0
YZ		 1925 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1926 msf->imsf_fmode, 0, NULL, 0);
1927 }
1da177e4
LT		 1928 psl = pmc->sflist;
1929 if (psl) {
1930 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1931 psl->sl_count, psl->sl_addr, 0);
1932 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1933 } else
1934 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1935 0, NULL, 0);
1936 pmc->sflist = newpsl;
1937 pmc->sfmode = msf->imsf_fmode;
917f2f10 1938 err = 0;
1da177e4
LT		 1939done:
1940 rtnl_shunlock();
9951f036
DS		 1941 if (leavegroup)
1942 err = ip_mc_leave_group(sk, &imr);
1da177e4
LT		 1943 return err;
1944}
1945
1946int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
1947 struct ip_msfilter __user *optval, int __user *optlen)
1948{
1949 int err, len, count, copycount;
1950 struct ip_mreqn imr;
1951 u32 addr = msf->imsf_multiaddr;
1952 struct ip_mc_socklist *pmc;
1953 struct in_device *in_dev;
1954 struct inet_sock *inet = inet_sk(sk);
1955 struct ip_sf_socklist *psl;
1956
1957 if (!MULTICAST(addr))
1958 return -EINVAL;
1959
1960 rtnl_shlock();
1961
1962 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1963 imr.imr_address.s_addr = msf->imsf_interface;
1964 imr.imr_ifindex = 0;
1965 in_dev = ip_mc_find_dev(&imr);
1966
1967 if (!in_dev) {
1968 err = -ENODEV;
1969 goto done;
1970 }
1971 err = -EADDRNOTAVAIL;
1972
1973 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1974 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1975 pmc->multi.imr_ifindex == imr.imr_ifindex)
1976 break;
1977 }
1978 if (!pmc) /* must have a prior join */
1979 goto done;
1980 msf->imsf_fmode = pmc->sfmode;
1981 psl = pmc->sflist;
1982 rtnl_shunlock();
1983 if (!psl) {
1984 len = 0;
1985 count = 0;
1986 } else {
1987 count = psl->sl_count;
1988 }
1989 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
1990 len = copycount * sizeof(psl->sl_addr[0]);
1991 msf->imsf_numsrc = count;
1992 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
1993 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
1994 return -EFAULT;
1995 }
1996 if (len &&
1997 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
1998 return -EFAULT;
1999 return 0;
2000done:
2001 rtnl_shunlock();
2002 return err;
2003}
2004
2005int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2006 struct group_filter __user *optval, int __user *optlen)
2007{
2008 int err, i, count, copycount;
2009 struct sockaddr_in *psin;
2010 u32 addr;
2011 struct ip_mc_socklist *pmc;
2012 struct inet_sock *inet = inet_sk(sk);
2013 struct ip_sf_socklist *psl;
2014
2015 psin = (struct sockaddr_in *)&gsf->gf_group;
2016 if (psin->sin_family != AF_INET)
2017 return -EINVAL;
2018 addr = psin->sin_addr.s_addr;
2019 if (!MULTICAST(addr))
2020 return -EINVAL;
2021
2022 rtnl_shlock();
2023
2024 err = -EADDRNOTAVAIL;
2025
2026 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2027 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2028 pmc->multi.imr_ifindex == gsf->gf_interface)
2029 break;
2030 }
2031 if (!pmc) /* must have a prior join */
2032 goto done;
2033 gsf->gf_fmode = pmc->sfmode;
2034 psl = pmc->sflist;
2035 rtnl_shunlock();
2036 count = psl ? psl->sl_count : 0;
2037 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2038 gsf->gf_numsrc = count;
2039 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2040 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2041 return -EFAULT;
2042 }
2043 for (i=0; i<copycount; i++) {
2044 struct sockaddr_in *psin;
2045 struct sockaddr_storage ss;
2046
2047 psin = (struct sockaddr_in *)&ss;
2048 memset(&ss, 0, sizeof(ss));
2049 psin->sin_family = AF_INET;
2050 psin->sin_addr.s_addr = psl->sl_addr[i];
2051 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2052 return -EFAULT;
2053 }
2054 return 0;
2055done:
2056 rtnl_shunlock();
2057 return err;
2058}
2059
2060/*
2061 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2062 */
2063int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
2064{
2065 struct inet_sock *inet = inet_sk(sk);
2066 struct ip_mc_socklist *pmc;
2067 struct ip_sf_socklist *psl;
2068 int i;
2069
2070 if (!MULTICAST(loc_addr))
2071 return 1;
2072
2073 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2074 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2075 pmc->multi.imr_ifindex == dif)
2076 break;
2077 }
2078 if (!pmc)
2079 return 1;
2080 psl = pmc->sflist;
2081 if (!psl)
2082 return pmc->sfmode == MCAST_EXCLUDE;
2083
2084 for (i=0; i<psl->sl_count; i++) {
2085 if (psl->sl_addr[i] == rmt_addr)
2086 break;
2087 }
2088 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2089 return 0;
2090 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2091 return 0;
2092 return 1;
2093}
2094
2095/*
2096 * A socket is closing.
2097 */
2098
2099void ip_mc_drop_socket(struct sock *sk)
2100{
2101 struct inet_sock *inet = inet_sk(sk);
2102 struct ip_mc_socklist *iml;
2103
2104 if (inet->mc_list == NULL)
2105 return;
2106
2107 rtnl_lock();
2108 while ((iml = inet->mc_list) != NULL) {
2109 struct in_device *in_dev;
2110 inet->mc_list = iml->next;
2111
2112 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) {
2113 (void) ip_mc_leave_src(sk, iml, in_dev);
2114 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2115 in_dev_put(in_dev);
2116 }
2117 sock_kfree_s(sk, iml, sizeof(*iml));
2118
2119 }
2120 rtnl_unlock();
2121}
2122
2123int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto)
2124{
2125 struct ip_mc_list *im;
2126 struct ip_sf_list *psf;
2127 int rv = 0;
2128
2129 read_lock(&in_dev->mc_list_lock);
2130 for (im=in_dev->mc_list; im; im=im->next) {
2131 if (im->multiaddr == mc_addr)
2132 break;
2133 }
2134 if (im && proto == IPPROTO_IGMP) {
2135 rv = 1;
2136 } else if (im) {
2137 if (src_addr) {
2138 for (psf=im->sources; psf; psf=psf->sf_next) {
2139 if (psf->sf_inaddr == src_addr)
2140 break;
2141 }
2142 if (psf)
2143 rv = psf->sf_count[MCAST_INCLUDE] ||
2144 psf->sf_count[MCAST_EXCLUDE] !=
2145 im->sfcount[MCAST_EXCLUDE];
2146 else
2147 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2148 } else
2149 rv = 1; /* unspecified source; tentatively allow */
2150 }
2151 read_unlock(&in_dev->mc_list_lock);
2152 return rv;
2153}
2154
2155#if defined(CONFIG_PROC_FS)
2156struct igmp_mc_iter_state {
2157 struct net_device *dev;
2158 struct in_device *in_dev;
2159};
2160
2161#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2162
2163static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2164{
2165 struct ip_mc_list *im = NULL;
2166 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2167
2168 for (state->dev = dev_base, state->in_dev = NULL;
2169 state->dev;
2170 state->dev = state->dev->next) {
2171 struct in_device *in_dev;
2172 in_dev = in_dev_get(state->dev);
2173 if (!in_dev)
2174 continue;
2175 read_lock(&in_dev->mc_list_lock);
2176 im = in_dev->mc_list;
2177 if (im) {
2178 state->in_dev = in_dev;
2179 break;
2180 }
2181 read_unlock(&in_dev->mc_list_lock);
2182 in_dev_put(in_dev);
2183 }
2184 return im;
2185}
2186
2187static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2188{
2189 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2190 im = im->next;
2191 while (!im) {
2192 if (likely(state->in_dev != NULL)) {
2193 read_unlock(&state->in_dev->mc_list_lock);
2194 in_dev_put(state->in_dev);
2195 }
2196 state->dev = state->dev->next;
2197 if (!state->dev) {
2198 state->in_dev = NULL;
2199 break;
2200 }
2201 state->in_dev = in_dev_get(state->dev);
2202 if (!state->in_dev)
2203 continue;
2204 read_lock(&state->in_dev->mc_list_lock);
2205 im = state->in_dev->mc_list;
2206 }
2207 return im;
2208}
2209
2210static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2211{
2212 struct ip_mc_list *im = igmp_mc_get_first(seq);
2213 if (im)
2214 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2215 --pos;
2216 return pos ? NULL : im;
2217}
2218
2219static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2220{
2221 read_lock(&dev_base_lock);
2222 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2223}
2224
2225static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2226{
2227 struct ip_mc_list *im;
2228 if (v == SEQ_START_TOKEN)
2229 im = igmp_mc_get_first(seq);
2230 else
2231 im = igmp_mc_get_next(seq, v);
2232 ++*pos;
2233 return im;
2234}
2235
2236static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2237{
2238 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2239 if (likely(state->in_dev != NULL)) {
2240 read_unlock(&state->in_dev->mc_list_lock);
2241 in_dev_put(state->in_dev);
2242 state->in_dev = NULL;
2243 }
2244 state->dev = NULL;
2245 read_unlock(&dev_base_lock);
2246}
2247
2248static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2249{
2250 if (v == SEQ_START_TOKEN)
2251 seq_puts(seq,
2252 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2253 else {
2254 struct ip_mc_list *im = (struct ip_mc_list *)v;
2255 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2256 char *querier;
2257#ifdef CONFIG_IP_MULTICAST
2258 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2259 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2260 "V3";
2261#else
2262 querier = "NONE";
2263#endif
2264
2265 if (state->in_dev->mc_list == im) {
2266 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2267 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2268 }
2269
2270 seq_printf(seq,
2271 "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n",
2272 im->multiaddr, im->users,
2273 im->tm_running, im->tm_running ?
2274 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2275 im->reporter);
2276 }
2277 return 0;
2278}
2279
2280static struct seq_operations igmp_mc_seq_ops = {
2281 .start = igmp_mc_seq_start,
2282 .next = igmp_mc_seq_next,
2283 .stop = igmp_mc_seq_stop,
2284 .show = igmp_mc_seq_show,
2285};
2286
2287static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2288{
2289 struct seq_file *seq;
2290 int rc = -ENOMEM;
2291 struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2292
2293 if (!s)
2294 goto out;
2295 rc = seq_open(file, &igmp_mc_seq_ops);
2296 if (rc)
2297 goto out_kfree;
2298
2299 seq = file->private_data;
2300 seq->private = s;
2301 memset(s, 0, sizeof(*s));
2302out:
2303 return rc;
2304out_kfree:
2305 kfree(s);
2306 goto out;
2307}
2308
2309static struct file_operations igmp_mc_seq_fops = {
2310 .owner = THIS_MODULE,
2311 .open = igmp_mc_seq_open,
2312 .read = seq_read,
2313 .llseek = seq_lseek,
2314 .release = seq_release_private,
2315};
2316
2317struct igmp_mcf_iter_state {
2318 struct net_device *dev;
2319 struct in_device *idev;
2320 struct ip_mc_list *im;
2321};
2322
2323#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2324
2325static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2326{
2327 struct ip_sf_list *psf = NULL;
2328 struct ip_mc_list *im = NULL;
2329 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2330
2331 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2332 state->dev;
2333 state->dev = state->dev->next) {
2334 struct in_device *idev;
2335 idev = in_dev_get(state->dev);
2336 if (unlikely(idev == NULL))
2337 continue;
2338 read_lock(&idev->mc_list_lock);
2339 im = idev->mc_list;
2340 if (likely(im != NULL)) {
2341 spin_lock_bh(&im->lock);
2342 psf = im->sources;
2343 if (likely(psf != NULL)) {
2344 state->im = im;
2345 state->idev = idev;
2346 break;
2347 }
2348 spin_unlock_bh(&im->lock);
2349 }
2350 read_unlock(&idev->mc_list_lock);
2351 in_dev_put(idev);
2352 }
2353 return psf;
2354}
2355
2356static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2357{
2358 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2359
2360 psf = psf->sf_next;
2361 while (!psf) {
2362 spin_unlock_bh(&state->im->lock);
2363 state->im = state->im->next;
2364 while (!state->im) {
2365 if (likely(state->idev != NULL)) {
2366 read_unlock(&state->idev->mc_list_lock);
2367 in_dev_put(state->idev);
2368 }
2369 state->dev = state->dev->next;
2370 if (!state->dev) {
2371 state->idev = NULL;
2372 goto out;
2373 }
2374 state->idev = in_dev_get(state->dev);
2375 if (!state->idev)
2376 continue;
2377 read_lock(&state->idev->mc_list_lock);
2378 state->im = state->idev->mc_list;
2379 }
2380 if (!state->im)
2381 break;
2382 spin_lock_bh(&state->im->lock);
2383 psf = state->im->sources;
2384 }
2385out:
2386 return psf;
2387}
2388
2389static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2390{
2391 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2392 if (psf)
2393 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2394 --pos;
2395 return pos ? NULL : psf;
2396}
2397
2398static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2399{
2400 read_lock(&dev_base_lock);
2401 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2402}
2403
2404static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2405{
2406 struct ip_sf_list *psf;
2407 if (v == SEQ_START_TOKEN)
2408 psf = igmp_mcf_get_first(seq);
2409 else
2410 psf = igmp_mcf_get_next(seq, v);
2411 ++*pos;
2412 return psf;
2413}
2414
2415static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2416{
2417 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2418 if (likely(state->im != NULL)) {
2419 spin_unlock_bh(&state->im->lock);
2420 state->im = NULL;
2421 }
2422 if (likely(state->idev != NULL)) {
2423 read_unlock(&state->idev->mc_list_lock);
2424 in_dev_put(state->idev);
2425 state->idev = NULL;
2426 }
2427 state->dev = NULL;
2428 read_unlock(&dev_base_lock);
2429}
2430
2431static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2432{
2433 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2434 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2435
2436 if (v == SEQ_START_TOKEN) {
2437 seq_printf(seq,
2438 "%3s %6s "
2439 "%10s %10s %6s %6s\n", "Idx",
2440 "Device", "MCA",
2441 "SRC", "INC", "EXC");
2442 } else {
2443 seq_printf(seq,
2444 "%3d %6.6s 0x%08x "
2445 "0x%08x %6lu %6lu\n",
2446 state->dev->ifindex, state->dev->name,
2447 ntohl(state->im->multiaddr),
2448 ntohl(psf->sf_inaddr),
2449 psf->sf_count[MCAST_INCLUDE],
2450 psf->sf_count[MCAST_EXCLUDE]);
2451 }
2452 return 0;
2453}
2454
2455static struct seq_operations igmp_mcf_seq_ops = {
2456 .start = igmp_mcf_seq_start,
2457 .next = igmp_mcf_seq_next,
2458 .stop = igmp_mcf_seq_stop,
2459 .show = igmp_mcf_seq_show,
2460};
2461
2462static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2463{
2464 struct seq_file *seq;
2465 int rc = -ENOMEM;
2466 struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2467
2468 if (!s)
2469 goto out;
2470 rc = seq_open(file, &igmp_mcf_seq_ops);
2471 if (rc)
2472 goto out_kfree;
2473
2474 seq = file->private_data;
2475 seq->private = s;
2476 memset(s, 0, sizeof(*s));
2477out:
2478 return rc;
2479out_kfree:
2480 kfree(s);
2481 goto out;
2482}
2483
2484static struct file_operations igmp_mcf_seq_fops = {
2485 .owner = THIS_MODULE,
2486 .open = igmp_mcf_seq_open,
2487 .read = seq_read,
2488 .llseek = seq_lseek,
2489 .release = seq_release_private,
2490};
2491
2492int __init igmp_mc_proc_init(void)
2493{
2494 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2495 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2496 return 0;
2497}
2498#endif
2499
2500EXPORT_SYMBOL(ip_mc_dec_group);
2501EXPORT_SYMBOL(ip_mc_inc_group);
2502EXPORT_SYMBOL(ip_mc_join_group);
Linux kernel - Deliverables
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