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-rw-r--r--net/ipv4/igmp.c2473
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diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
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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
875 if (!pskb_may_pull(skb, sizeof(struct igmphdr)) ||
876 (u16)csum_fold(skb_checksum(skb, 0, len, 0))) {
877 in_dev_put(in_dev);
878 kfree_skb(skb);
879 return 0;
880 }
881
882 ih = skb->h.igmph;
883 switch (ih->type) {
884 case IGMP_HOST_MEMBERSHIP_QUERY:
885 igmp_heard_query(in_dev, skb, len);
886 break;
887 case IGMP_HOST_MEMBERSHIP_REPORT:
888 case IGMPV2_HOST_MEMBERSHIP_REPORT:
889 case IGMPV3_HOST_MEMBERSHIP_REPORT:
890 /* Is it our report looped back? */
891 if (((struct rtable*)skb->dst)->fl.iif == 0)
892 break;
893 igmp_heard_report(in_dev, ih->group);
894 break;
895 case IGMP_PIM:
896#ifdef CONFIG_IP_PIMSM_V1
897 in_dev_put(in_dev);
898 return pim_rcv_v1(skb);
899#endif
900 case IGMP_DVMRP:
901 case IGMP_TRACE:
902 case IGMP_HOST_LEAVE_MESSAGE:
903 case IGMP_MTRACE:
904 case IGMP_MTRACE_RESP:
905 break;
906 default:
907 NETDEBUG(printk(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type));
908 }
909 in_dev_put(in_dev);
910 kfree_skb(skb);
911 return 0;
912}
913
914#endif
915
916
917/*
918 * Add a filter to a device
919 */
920
921static void ip_mc_filter_add(struct in_device *in_dev, u32 addr)
922{
923 char buf[MAX_ADDR_LEN];
924 struct net_device *dev = in_dev->dev;
925
926 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
927 We will get multicast token leakage, when IFF_MULTICAST
928 is changed. This check should be done in dev->set_multicast_list
929 routine. Something sort of:
930 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
931 --ANK
932 */
933 if (arp_mc_map(addr, buf, dev, 0) == 0)
934 dev_mc_add(dev,buf,dev->addr_len,0);
935}
936
937/*
938 * Remove a filter from a device
939 */
940
941static void ip_mc_filter_del(struct in_device *in_dev, u32 addr)
942{
943 char buf[MAX_ADDR_LEN];
944 struct net_device *dev = in_dev->dev;
945
946 if (arp_mc_map(addr, buf, dev, 0) == 0)
947 dev_mc_delete(dev,buf,dev->addr_len,0);
948}
949
950#ifdef CONFIG_IP_MULTICAST
951/*
952 * deleted ip_mc_list manipulation
953 */
954static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
955{
956 struct ip_mc_list *pmc;
957
958 /* this is an "ip_mc_list" for convenience; only the fields below
959 * are actually used. In particular, the refcnt and users are not
960 * used for management of the delete list. Using the same structure
961 * for deleted items allows change reports to use common code with
962 * non-deleted or query-response MCA's.
963 */
964 pmc = (struct ip_mc_list *)kmalloc(sizeof(*pmc), GFP_KERNEL);
965 if (!pmc)
966 return;
967 memset(pmc, 0, sizeof(*pmc));
968 spin_lock_bh(&im->lock);
969 pmc->interface = im->interface;
970 in_dev_hold(in_dev);
971 pmc->multiaddr = im->multiaddr;
972 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
973 IGMP_Unsolicited_Report_Count;
974 pmc->sfmode = im->sfmode;
975 if (pmc->sfmode == MCAST_INCLUDE) {
976 struct ip_sf_list *psf;
977
978 pmc->tomb = im->tomb;
979 pmc->sources = im->sources;
980 im->tomb = im->sources = NULL;
981 for (psf=pmc->sources; psf; psf=psf->sf_next)
982 psf->sf_crcount = pmc->crcount;
983 }
984 spin_unlock_bh(&im->lock);
985
986 spin_lock_bh(&in_dev->mc_tomb_lock);
987 pmc->next = in_dev->mc_tomb;
988 in_dev->mc_tomb = pmc;
989 spin_unlock_bh(&in_dev->mc_tomb_lock);
990}
991
992static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr)
993{
994 struct ip_mc_list *pmc, *pmc_prev;
995 struct ip_sf_list *psf, *psf_next;
996
997 spin_lock_bh(&in_dev->mc_tomb_lock);
998 pmc_prev = NULL;
999 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1000 if (pmc->multiaddr == multiaddr)
1001 break;
1002 pmc_prev = pmc;
1003 }
1004 if (pmc) {
1005 if (pmc_prev)
1006 pmc_prev->next = pmc->next;
1007 else
1008 in_dev->mc_tomb = pmc->next;
1009 }
1010 spin_unlock_bh(&in_dev->mc_tomb_lock);
1011 if (pmc) {
1012 for (psf=pmc->tomb; psf; psf=psf_next) {
1013 psf_next = psf->sf_next;
1014 kfree(psf);
1015 }
1016 in_dev_put(pmc->interface);
1017 kfree(pmc);
1018 }
1019}
1020
1021static void igmpv3_clear_delrec(struct in_device *in_dev)
1022{
1023 struct ip_mc_list *pmc, *nextpmc;
1024
1025 spin_lock_bh(&in_dev->mc_tomb_lock);
1026 pmc = in_dev->mc_tomb;
1027 in_dev->mc_tomb = NULL;
1028 spin_unlock_bh(&in_dev->mc_tomb_lock);
1029
1030 for (; pmc; pmc = nextpmc) {
1031 nextpmc = pmc->next;
1032 ip_mc_clear_src(pmc);
1033 in_dev_put(pmc->interface);
1034 kfree(pmc);
1035 }
1036 /* clear dead sources, too */
1037 read_lock(&in_dev->mc_list_lock);
1038 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1039 struct ip_sf_list *psf, *psf_next;
1040
1041 spin_lock_bh(&pmc->lock);
1042 psf = pmc->tomb;
1043 pmc->tomb = NULL;
1044 spin_unlock_bh(&pmc->lock);
1045 for (; psf; psf=psf_next) {
1046 psf_next = psf->sf_next;
1047 kfree(psf);
1048 }
1049 }
1050 read_unlock(&in_dev->mc_list_lock);
1051}
1052#endif
1053
1054static void igmp_group_dropped(struct ip_mc_list *im)
1055{
1056 struct in_device *in_dev = im->interface;
1057#ifdef CONFIG_IP_MULTICAST
1058 int reporter;
1059#endif
1060
1061 if (im->loaded) {
1062 im->loaded = 0;
1063 ip_mc_filter_del(in_dev, im->multiaddr);
1064 }
1065
1066#ifdef CONFIG_IP_MULTICAST
1067 if (im->multiaddr == IGMP_ALL_HOSTS)
1068 return;
1069
1070 reporter = im->reporter;
1071 igmp_stop_timer(im);
1072
1073 if (!in_dev->dead) {
1074 if (IGMP_V1_SEEN(in_dev))
1075 goto done;
1076 if (IGMP_V2_SEEN(in_dev)) {
1077 if (reporter)
1078 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1079 goto done;
1080 }
1081 /* IGMPv3 */
1082 igmpv3_add_delrec(in_dev, im);
1083
1084 igmp_ifc_event(in_dev);
1085 }
1086done:
1087#endif
1088 ip_mc_clear_src(im);
1089}
1090
1091static void igmp_group_added(struct ip_mc_list *im)
1092{
1093 struct in_device *in_dev = im->interface;
1094
1095 if (im->loaded == 0) {
1096 im->loaded = 1;
1097 ip_mc_filter_add(in_dev, im->multiaddr);
1098 }
1099
1100#ifdef CONFIG_IP_MULTICAST
1101 if (im->multiaddr == IGMP_ALL_HOSTS)
1102 return;
1103
1104 if (in_dev->dead)
1105 return;
1106 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1107 spin_lock_bh(&im->lock);
1108 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1109 spin_unlock_bh(&im->lock);
1110 return;
1111 }
1112 /* else, v3 */
1113
1114 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1115 IGMP_Unsolicited_Report_Count;
1116 igmp_ifc_event(in_dev);
1117#endif
1118}
1119
1120
1121/*
1122 * Multicast list managers
1123 */
1124
1125
1126/*
1127 * A socket has joined a multicast group on device dev.
1128 */
1129
1130void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
1131{
1132 struct ip_mc_list *im;
1133
1134 ASSERT_RTNL();
1135
1136 for (im=in_dev->mc_list; im; im=im->next) {
1137 if (im->multiaddr == addr) {
1138 im->users++;
1139 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1140 goto out;
1141 }
1142 }
1143
1144 im = (struct ip_mc_list *)kmalloc(sizeof(*im), GFP_KERNEL);
1145 if (!im)
1146 goto out;
1147
1148 im->users=1;
1149 im->interface=in_dev;
1150 in_dev_hold(in_dev);
1151 im->multiaddr=addr;
1152 /* initial mode is (EX, empty) */
1153 im->sfmode = MCAST_EXCLUDE;
1154 im->sfcount[MCAST_INCLUDE] = 0;
1155 im->sfcount[MCAST_EXCLUDE] = 1;
1156 im->sources = NULL;
1157 im->tomb = NULL;
1158 im->crcount = 0;
1159 atomic_set(&im->refcnt, 1);
1160 spin_lock_init(&im->lock);
1161#ifdef CONFIG_IP_MULTICAST
1162 im->tm_running=0;
1163 init_timer(&im->timer);
1164 im->timer.data=(unsigned long)im;
1165 im->timer.function=&igmp_timer_expire;
1166 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1167 im->reporter = 0;
1168 im->gsquery = 0;
1169#endif
1170 im->loaded = 0;
1171 write_lock_bh(&in_dev->mc_list_lock);
1172 im->next=in_dev->mc_list;
1173 in_dev->mc_list=im;
1174 write_unlock_bh(&in_dev->mc_list_lock);
1175#ifdef CONFIG_IP_MULTICAST
1176 igmpv3_del_delrec(in_dev, im->multiaddr);
1177#endif
1178 igmp_group_added(im);
1179 if (!in_dev->dead)
1180 ip_rt_multicast_event(in_dev);
1181out:
1182 return;
1183}
1184
1185/*
1186 * A socket has left a multicast group on device dev
1187 */
1188
1189void ip_mc_dec_group(struct in_device *in_dev, u32 addr)
1190{
1191 struct ip_mc_list *i, **ip;
1192
1193 ASSERT_RTNL();
1194
1195 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1196 if (i->multiaddr==addr) {
1197 if (--i->users == 0) {
1198 write_lock_bh(&in_dev->mc_list_lock);
1199 *ip = i->next;
1200 write_unlock_bh(&in_dev->mc_list_lock);
1201 igmp_group_dropped(i);
1202
1203 if (!in_dev->dead)
1204 ip_rt_multicast_event(in_dev);
1205
1206 ip_ma_put(i);
1207 return;
1208 }
1209 break;
1210 }
1211 }
1212}
1213
1214/* Device going down */
1215
1216void ip_mc_down(struct in_device *in_dev)
1217{
1218 struct ip_mc_list *i;
1219
1220 ASSERT_RTNL();
1221
1222 for (i=in_dev->mc_list; i; i=i->next)
1223 igmp_group_dropped(i);
1224
1225#ifdef CONFIG_IP_MULTICAST
1226 in_dev->mr_ifc_count = 0;
1227 if (del_timer(&in_dev->mr_ifc_timer))
1228 __in_dev_put(in_dev);
1229 in_dev->mr_gq_running = 0;
1230 if (del_timer(&in_dev->mr_gq_timer))
1231 __in_dev_put(in_dev);
1232 igmpv3_clear_delrec(in_dev);
1233#endif
1234
1235 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1236}
1237
1238void ip_mc_init_dev(struct in_device *in_dev)
1239{
1240 ASSERT_RTNL();
1241
1242 in_dev->mc_tomb = NULL;
1243#ifdef CONFIG_IP_MULTICAST
1244 in_dev->mr_gq_running = 0;
1245 init_timer(&in_dev->mr_gq_timer);
1246 in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1247 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1248 in_dev->mr_ifc_count = 0;
1249 init_timer(&in_dev->mr_ifc_timer);
1250 in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1251 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1252 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1253#endif
1254
1255 rwlock_init(&in_dev->mc_list_lock);
1256 spin_lock_init(&in_dev->mc_tomb_lock);
1257}
1258
1259/* Device going up */
1260
1261void ip_mc_up(struct in_device *in_dev)
1262{
1263 struct ip_mc_list *i;
1264
1265 ASSERT_RTNL();
1266
1267 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1268
1269 for (i=in_dev->mc_list; i; i=i->next)
1270 igmp_group_added(i);
1271}
1272
1273/*
1274 * Device is about to be destroyed: clean up.
1275 */
1276
1277void ip_mc_destroy_dev(struct in_device *in_dev)
1278{
1279 struct ip_mc_list *i;
1280
1281 ASSERT_RTNL();
1282
1283 /* Deactivate timers */
1284 ip_mc_down(in_dev);
1285
1286 write_lock_bh(&in_dev->mc_list_lock);
1287 while ((i = in_dev->mc_list) != NULL) {
1288 in_dev->mc_list = i->next;
1289 write_unlock_bh(&in_dev->mc_list_lock);
1290
1291 igmp_group_dropped(i);
1292 ip_ma_put(i);
1293
1294 write_lock_bh(&in_dev->mc_list_lock);
1295 }
1296 write_unlock_bh(&in_dev->mc_list_lock);
1297}
1298
1299static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1300{
1301 struct flowi fl = { .nl_u = { .ip4_u =
1302 { .daddr = imr->imr_multiaddr.s_addr } } };
1303 struct rtable *rt;
1304 struct net_device *dev = NULL;
1305 struct in_device *idev = NULL;
1306
1307 if (imr->imr_ifindex) {
1308 idev = inetdev_by_index(imr->imr_ifindex);
1309 if (idev)
1310 __in_dev_put(idev);
1311 return idev;
1312 }
1313 if (imr->imr_address.s_addr) {
1314 dev = ip_dev_find(imr->imr_address.s_addr);
1315 if (!dev)
1316 return NULL;
1317 __dev_put(dev);
1318 }
1319
1320 if (!dev && !ip_route_output_key(&rt, &fl)) {
1321 dev = rt->u.dst.dev;
1322 ip_rt_put(rt);
1323 }
1324 if (dev) {
1325 imr->imr_ifindex = dev->ifindex;
1326 idev = __in_dev_get(dev);
1327 }
1328 return idev;
1329}
1330
1331/*
1332 * Join a socket to a group
1333 */
1334int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS;
1335int sysctl_igmp_max_msf = IP_MAX_MSF;
1336
1337
1338static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1339 __u32 *psfsrc)
1340{
1341 struct ip_sf_list *psf, *psf_prev;
1342 int rv = 0;
1343
1344 psf_prev = NULL;
1345 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1346 if (psf->sf_inaddr == *psfsrc)
1347 break;
1348 psf_prev = psf;
1349 }
1350 if (!psf || psf->sf_count[sfmode] == 0) {
1351 /* source filter not found, or count wrong => bug */
1352 return -ESRCH;
1353 }
1354 psf->sf_count[sfmode]--;
1355 if (psf->sf_count[sfmode] == 0) {
1356 ip_rt_multicast_event(pmc->interface);
1357 }
1358 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1359#ifdef CONFIG_IP_MULTICAST
1360 struct in_device *in_dev = pmc->interface;
1361#endif
1362
1363 /* no more filters for this source */
1364 if (psf_prev)
1365 psf_prev->sf_next = psf->sf_next;
1366 else
1367 pmc->sources = psf->sf_next;
1368#ifdef CONFIG_IP_MULTICAST
1369 if (psf->sf_oldin &&
1370 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1371 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1372 IGMP_Unsolicited_Report_Count;
1373 psf->sf_next = pmc->tomb;
1374 pmc->tomb = psf;
1375 rv = 1;
1376 } else
1377#endif
1378 kfree(psf);
1379 }
1380 return rv;
1381}
1382
1383#ifndef CONFIG_IP_MULTICAST
1384#define igmp_ifc_event(x) do { } while (0)
1385#endif
1386
1387static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1388 int sfcount, __u32 *psfsrc, int delta)
1389{
1390 struct ip_mc_list *pmc;
1391 int changerec = 0;
1392 int i, err;
1393
1394 if (!in_dev)
1395 return -ENODEV;
1396 read_lock(&in_dev->mc_list_lock);
1397 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1398 if (*pmca == pmc->multiaddr)
1399 break;
1400 }
1401 if (!pmc) {
1402 /* MCA not found?? bug */
1403 read_unlock(&in_dev->mc_list_lock);
1404 return -ESRCH;
1405 }
1406 spin_lock_bh(&pmc->lock);
1407 read_unlock(&in_dev->mc_list_lock);
1408#ifdef CONFIG_IP_MULTICAST
1409 sf_markstate(pmc);
1410#endif
1411 if (!delta) {
1412 err = -EINVAL;
1413 if (!pmc->sfcount[sfmode])
1414 goto out_unlock;
1415 pmc->sfcount[sfmode]--;
1416 }
1417 err = 0;
1418 for (i=0; i<sfcount; i++) {
1419 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1420
1421 changerec |= rv > 0;
1422 if (!err && rv < 0)
1423 err = rv;
1424 }
1425 if (pmc->sfmode == MCAST_EXCLUDE &&
1426 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1427 pmc->sfcount[MCAST_INCLUDE]) {
1428#ifdef CONFIG_IP_MULTICAST
1429 struct ip_sf_list *psf;
1430#endif
1431
1432 /* filter mode change */
1433 pmc->sfmode = MCAST_INCLUDE;
1434#ifdef CONFIG_IP_MULTICAST
1435 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1436 IGMP_Unsolicited_Report_Count;
1437 in_dev->mr_ifc_count = pmc->crcount;
1438 for (psf=pmc->sources; psf; psf = psf->sf_next)
1439 psf->sf_crcount = 0;
1440 igmp_ifc_event(pmc->interface);
1441 } else if (sf_setstate(pmc) || changerec) {
1442 igmp_ifc_event(pmc->interface);
1443#endif
1444 }
1445out_unlock:
1446 spin_unlock_bh(&pmc->lock);
1447 return err;
1448}
1449
1450/*
1451 * Add multicast single-source filter to the interface list
1452 */
1453static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1454 __u32 *psfsrc, int delta)
1455{
1456 struct ip_sf_list *psf, *psf_prev;
1457
1458 psf_prev = NULL;
1459 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1460 if (psf->sf_inaddr == *psfsrc)
1461 break;
1462 psf_prev = psf;
1463 }
1464 if (!psf) {
1465 psf = (struct ip_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1466 if (!psf)
1467 return -ENOBUFS;
1468 memset(psf, 0, sizeof(*psf));
1469 psf->sf_inaddr = *psfsrc;
1470 if (psf_prev) {
1471 psf_prev->sf_next = psf;
1472 } else
1473 pmc->sources = psf;
1474 }
1475 psf->sf_count[sfmode]++;
1476 if (psf->sf_count[sfmode] == 1) {
1477 ip_rt_multicast_event(pmc->interface);
1478 }
1479 return 0;
1480}
1481
1482#ifdef CONFIG_IP_MULTICAST
1483static void sf_markstate(struct ip_mc_list *pmc)
1484{
1485 struct ip_sf_list *psf;
1486 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1487
1488 for (psf=pmc->sources; psf; psf=psf->sf_next)
1489 if (pmc->sfcount[MCAST_EXCLUDE]) {
1490 psf->sf_oldin = mca_xcount ==
1491 psf->sf_count[MCAST_EXCLUDE] &&
1492 !psf->sf_count[MCAST_INCLUDE];
1493 } else
1494 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1495}
1496
1497static int sf_setstate(struct ip_mc_list *pmc)
1498{
1499 struct ip_sf_list *psf;
1500 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1501 int qrv = pmc->interface->mr_qrv;
1502 int new_in, rv;
1503
1504 rv = 0;
1505 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1506 if (pmc->sfcount[MCAST_EXCLUDE]) {
1507 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1508 !psf->sf_count[MCAST_INCLUDE];
1509 } else
1510 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1511 if (new_in != psf->sf_oldin) {
1512 psf->sf_crcount = qrv;
1513 rv++;
1514 }
1515 }
1516 return rv;
1517}
1518#endif
1519
1520/*
1521 * Add multicast source filter list to the interface list
1522 */
1523static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1524 int sfcount, __u32 *psfsrc, int delta)
1525{
1526 struct ip_mc_list *pmc;
1527 int isexclude;
1528 int i, err;
1529
1530 if (!in_dev)
1531 return -ENODEV;
1532 read_lock(&in_dev->mc_list_lock);
1533 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1534 if (*pmca == pmc->multiaddr)
1535 break;
1536 }
1537 if (!pmc) {
1538 /* MCA not found?? bug */
1539 read_unlock(&in_dev->mc_list_lock);
1540 return -ESRCH;
1541 }
1542 spin_lock_bh(&pmc->lock);
1543 read_unlock(&in_dev->mc_list_lock);
1544
1545#ifdef CONFIG_IP_MULTICAST
1546 sf_markstate(pmc);
1547#endif
1548 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1549 if (!delta)
1550 pmc->sfcount[sfmode]++;
1551 err = 0;
1552 for (i=0; i<sfcount; i++) {
1553 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1554 if (err)
1555 break;
1556 }
1557 if (err) {
1558 int j;
1559
1560 pmc->sfcount[sfmode]--;
1561 for (j=0; j<i; j++)
1562 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1563 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1564#ifdef CONFIG_IP_MULTICAST
1565 struct in_device *in_dev = pmc->interface;
1566 struct ip_sf_list *psf;
1567#endif
1568
1569 /* filter mode change */
1570 if (pmc->sfcount[MCAST_EXCLUDE])
1571 pmc->sfmode = MCAST_EXCLUDE;
1572 else if (pmc->sfcount[MCAST_INCLUDE])
1573 pmc->sfmode = MCAST_INCLUDE;
1574#ifdef CONFIG_IP_MULTICAST
1575 /* else no filters; keep old mode for reports */
1576
1577 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1578 IGMP_Unsolicited_Report_Count;
1579 in_dev->mr_ifc_count = pmc->crcount;
1580 for (psf=pmc->sources; psf; psf = psf->sf_next)
1581 psf->sf_crcount = 0;
1582 igmp_ifc_event(in_dev);
1583 } else if (sf_setstate(pmc)) {
1584 igmp_ifc_event(in_dev);
1585#endif
1586 }
1587 spin_unlock_bh(&pmc->lock);
1588 return err;
1589}
1590
1591static void ip_mc_clear_src(struct ip_mc_list *pmc)
1592{
1593 struct ip_sf_list *psf, *nextpsf;
1594
1595 for (psf=pmc->tomb; psf; psf=nextpsf) {
1596 nextpsf = psf->sf_next;
1597 kfree(psf);
1598 }
1599 pmc->tomb = NULL;
1600 for (psf=pmc->sources; psf; psf=nextpsf) {
1601 nextpsf = psf->sf_next;
1602 kfree(psf);
1603 }
1604 pmc->sources = NULL;
1605 pmc->sfmode = MCAST_EXCLUDE;
1606 pmc->sfcount[MCAST_EXCLUDE] = 0;
1607 pmc->sfcount[MCAST_EXCLUDE] = 1;
1608}
1609
1610
1611/*
1612 * Join a multicast group
1613 */
1614int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1615{
1616 int err;
1617 u32 addr = imr->imr_multiaddr.s_addr;
1618 struct ip_mc_socklist *iml, *i;
1619 struct in_device *in_dev;
1620 struct inet_sock *inet = inet_sk(sk);
1621 int count = 0;
1622
1623 if (!MULTICAST(addr))
1624 return -EINVAL;
1625
1626 rtnl_shlock();
1627
1628 in_dev = ip_mc_find_dev(imr);
1629
1630 if (!in_dev) {
1631 iml = NULL;
1632 err = -ENODEV;
1633 goto done;
1634 }
1635
1636 iml = (struct ip_mc_socklist *)sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1637
1638 err = -EADDRINUSE;
1639 for (i = inet->mc_list; i; i = i->next) {
1640 if (memcmp(&i->multi, imr, sizeof(*imr)) == 0) {
1641 /* New style additions are reference counted */
1642 if (imr->imr_address.s_addr == 0) {
1643 i->count++;
1644 err = 0;
1645 }
1646 goto done;
1647 }
1648 count++;
1649 }
1650 err = -ENOBUFS;
1651 if (iml == NULL || count >= sysctl_igmp_max_memberships)
1652 goto done;
1653 memcpy(&iml->multi, imr, sizeof(*imr));
1654 iml->next = inet->mc_list;
1655 iml->count = 1;
1656 iml->sflist = NULL;
1657 iml->sfmode = MCAST_EXCLUDE;
1658 inet->mc_list = iml;
1659 ip_mc_inc_group(in_dev, addr);
1660 iml = NULL;
1661 err = 0;
1662
1663done:
1664 rtnl_shunlock();
1665 if (iml)
1666 sock_kfree_s(sk, iml, sizeof(*iml));
1667 return err;
1668}
1669
1670static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1671 struct in_device *in_dev)
1672{
1673 int err;
1674
1675 if (iml->sflist == 0) {
1676 /* any-source empty exclude case */
1677 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1678 iml->sfmode, 0, NULL, 0);
1679 }
1680 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1681 iml->sfmode, iml->sflist->sl_count,
1682 iml->sflist->sl_addr, 0);
1683 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1684 iml->sflist = NULL;
1685 return err;
1686}
1687
1688/*
1689 * Ask a socket to leave a group.
1690 */
1691
1692int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1693{
1694 struct inet_sock *inet = inet_sk(sk);
1695 struct ip_mc_socklist *iml, **imlp;
1696
1697 rtnl_lock();
1698 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1699 if (iml->multi.imr_multiaddr.s_addr==imr->imr_multiaddr.s_addr &&
1700 iml->multi.imr_address.s_addr==imr->imr_address.s_addr &&
1701 (!imr->imr_ifindex || iml->multi.imr_ifindex==imr->imr_ifindex)) {
1702 struct in_device *in_dev;
1703
1704 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
1705 if (in_dev)
1706 (void) ip_mc_leave_src(sk, iml, in_dev);
1707 if (--iml->count) {
1708 rtnl_unlock();
1709 if (in_dev)
1710 in_dev_put(in_dev);
1711 return 0;
1712 }
1713
1714 *imlp = iml->next;
1715
1716 if (in_dev) {
1717 ip_mc_dec_group(in_dev, imr->imr_multiaddr.s_addr);
1718 in_dev_put(in_dev);
1719 }
1720 rtnl_unlock();
1721 sock_kfree_s(sk, iml, sizeof(*iml));
1722 return 0;
1723 }
1724 }
1725 rtnl_unlock();
1726 return -EADDRNOTAVAIL;
1727}
1728
1729int ip_mc_source(int add, int omode, struct sock *sk, struct
1730 ip_mreq_source *mreqs, int ifindex)
1731{
1732 int err;
1733 struct ip_mreqn imr;
1734 u32 addr = mreqs->imr_multiaddr;
1735 struct ip_mc_socklist *pmc;
1736 struct in_device *in_dev = NULL;
1737 struct inet_sock *inet = inet_sk(sk);
1738 struct ip_sf_socklist *psl;
1739 int i, j, rv;
1740
1741 if (!MULTICAST(addr))
1742 return -EINVAL;
1743
1744 rtnl_shlock();
1745
1746 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1747 imr.imr_address.s_addr = mreqs->imr_interface;
1748 imr.imr_ifindex = ifindex;
1749 in_dev = ip_mc_find_dev(&imr);
1750
1751 if (!in_dev) {
1752 err = -ENODEV;
1753 goto done;
1754 }
1755 err = -EADDRNOTAVAIL;
1756
1757 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1758 if (memcmp(&pmc->multi, mreqs, 2*sizeof(__u32)) == 0)
1759 break;
1760 }
1761 if (!pmc) /* must have a prior join */
1762 goto done;
1763 /* if a source filter was set, must be the same mode as before */
1764 if (pmc->sflist) {
1765 if (pmc->sfmode != omode)
1766 goto done;
1767 } else if (pmc->sfmode != omode) {
1768 /* allow mode switches for empty-set filters */
1769 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1770 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1771 NULL, 0);
1772 pmc->sfmode = omode;
1773 }
1774
1775 psl = pmc->sflist;
1776 if (!add) {
1777 if (!psl)
1778 goto done;
1779 rv = !0;
1780 for (i=0; i<psl->sl_count; i++) {
1781 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1782 sizeof(__u32));
1783 if (rv == 0)
1784 break;
1785 }
1786 if (rv) /* source not found */
1787 goto done;
1788
1789 /* update the interface filter */
1790 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1791 &mreqs->imr_sourceaddr, 1);
1792
1793 for (j=i+1; j<psl->sl_count; j++)
1794 psl->sl_addr[j-1] = psl->sl_addr[j];
1795 psl->sl_count--;
1796 err = 0;
1797 goto done;
1798 }
1799 /* else, add a new source to the filter */
1800
1801 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1802 err = -ENOBUFS;
1803 goto done;
1804 }
1805 if (!psl || psl->sl_count == psl->sl_max) {
1806 struct ip_sf_socklist *newpsl;
1807 int count = IP_SFBLOCK;
1808
1809 if (psl)
1810 count += psl->sl_max;
1811 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk,
1812 IP_SFLSIZE(count), GFP_KERNEL);
1813 if (!newpsl) {
1814 err = -ENOBUFS;
1815 goto done;
1816 }
1817 newpsl->sl_max = count;
1818 newpsl->sl_count = count - IP_SFBLOCK;
1819 if (psl) {
1820 for (i=0; i<psl->sl_count; i++)
1821 newpsl->sl_addr[i] = psl->sl_addr[i];
1822 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1823 }
1824 pmc->sflist = psl = newpsl;
1825 }
1826 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1827 for (i=0; i<psl->sl_count; i++) {
1828 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1829 sizeof(__u32));
1830 if (rv == 0)
1831 break;
1832 }
1833 if (rv == 0) /* address already there is an error */
1834 goto done;
1835 for (j=psl->sl_count-1; j>=i; j--)
1836 psl->sl_addr[j+1] = psl->sl_addr[j];
1837 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1838 psl->sl_count++;
1839 err = 0;
1840 /* update the interface list */
1841 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1842 &mreqs->imr_sourceaddr, 1);
1843done:
1844 rtnl_shunlock();
1845 return err;
1846}
1847
1848int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1849{
1850 int err;
1851 struct ip_mreqn imr;
1852 u32 addr = msf->imsf_multiaddr;
1853 struct ip_mc_socklist *pmc;
1854 struct in_device *in_dev;
1855 struct inet_sock *inet = inet_sk(sk);
1856 struct ip_sf_socklist *newpsl, *psl;
1857
1858 if (!MULTICAST(addr))
1859 return -EINVAL;
1860 if (msf->imsf_fmode != MCAST_INCLUDE &&
1861 msf->imsf_fmode != MCAST_EXCLUDE)
1862 return -EINVAL;
1863
1864 rtnl_shlock();
1865
1866 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1867 imr.imr_address.s_addr = msf->imsf_interface;
1868 imr.imr_ifindex = ifindex;
1869 in_dev = ip_mc_find_dev(&imr);
1870
1871 if (!in_dev) {
1872 err = -ENODEV;
1873 goto done;
1874 }
1875 err = -EADDRNOTAVAIL;
1876
1877 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1878 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1879 pmc->multi.imr_ifindex == imr.imr_ifindex)
1880 break;
1881 }
1882 if (!pmc) /* must have a prior join */
1883 goto done;
1884 if (msf->imsf_numsrc) {
1885 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk,
1886 IP_SFLSIZE(msf->imsf_numsrc), GFP_KERNEL);
1887 if (!newpsl) {
1888 err = -ENOBUFS;
1889 goto done;
1890 }
1891 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
1892 memcpy(newpsl->sl_addr, msf->imsf_slist,
1893 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
1894 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1895 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
1896 if (err) {
1897 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
1898 goto done;
1899 }
1900 } else
1901 newpsl = NULL;
1902 psl = pmc->sflist;
1903 if (psl) {
1904 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1905 psl->sl_count, psl->sl_addr, 0);
1906 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1907 } else
1908 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1909 0, NULL, 0);
1910 pmc->sflist = newpsl;
1911 pmc->sfmode = msf->imsf_fmode;
1912done:
1913 rtnl_shunlock();
1914 return err;
1915}
1916
1917int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
1918 struct ip_msfilter __user *optval, int __user *optlen)
1919{
1920 int err, len, count, copycount;
1921 struct ip_mreqn imr;
1922 u32 addr = msf->imsf_multiaddr;
1923 struct ip_mc_socklist *pmc;
1924 struct in_device *in_dev;
1925 struct inet_sock *inet = inet_sk(sk);
1926 struct ip_sf_socklist *psl;
1927
1928 if (!MULTICAST(addr))
1929 return -EINVAL;
1930
1931 rtnl_shlock();
1932
1933 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1934 imr.imr_address.s_addr = msf->imsf_interface;
1935 imr.imr_ifindex = 0;
1936 in_dev = ip_mc_find_dev(&imr);
1937
1938 if (!in_dev) {
1939 err = -ENODEV;
1940 goto done;
1941 }
1942 err = -EADDRNOTAVAIL;
1943
1944 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1945 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1946 pmc->multi.imr_ifindex == imr.imr_ifindex)
1947 break;
1948 }
1949 if (!pmc) /* must have a prior join */
1950 goto done;
1951 msf->imsf_fmode = pmc->sfmode;
1952 psl = pmc->sflist;
1953 rtnl_shunlock();
1954 if (!psl) {
1955 len = 0;
1956 count = 0;
1957 } else {
1958 count = psl->sl_count;
1959 }
1960 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
1961 len = copycount * sizeof(psl->sl_addr[0]);
1962 msf->imsf_numsrc = count;
1963 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
1964 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
1965 return -EFAULT;
1966 }
1967 if (len &&
1968 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
1969 return -EFAULT;
1970 return 0;
1971done:
1972 rtnl_shunlock();
1973 return err;
1974}
1975
1976int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
1977 struct group_filter __user *optval, int __user *optlen)
1978{
1979 int err, i, count, copycount;
1980 struct sockaddr_in *psin;
1981 u32 addr;
1982 struct ip_mc_socklist *pmc;
1983 struct inet_sock *inet = inet_sk(sk);
1984 struct ip_sf_socklist *psl;
1985
1986 psin = (struct sockaddr_in *)&gsf->gf_group;
1987 if (psin->sin_family != AF_INET)
1988 return -EINVAL;
1989 addr = psin->sin_addr.s_addr;
1990 if (!MULTICAST(addr))
1991 return -EINVAL;
1992
1993 rtnl_shlock();
1994
1995 err = -EADDRNOTAVAIL;
1996
1997 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1998 if (pmc->multi.imr_multiaddr.s_addr == addr &&
1999 pmc->multi.imr_ifindex == gsf->gf_interface)
2000 break;
2001 }
2002 if (!pmc) /* must have a prior join */
2003 goto done;
2004 gsf->gf_fmode = pmc->sfmode;
2005 psl = pmc->sflist;
2006 rtnl_shunlock();
2007 count = psl ? psl->sl_count : 0;
2008 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2009 gsf->gf_numsrc = count;
2010 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2011 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2012 return -EFAULT;
2013 }
2014 for (i=0; i<copycount; i++) {
2015 struct sockaddr_in *psin;
2016 struct sockaddr_storage ss;
2017
2018 psin = (struct sockaddr_in *)&ss;
2019 memset(&ss, 0, sizeof(ss));
2020 psin->sin_family = AF_INET;
2021 psin->sin_addr.s_addr = psl->sl_addr[i];
2022 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2023 return -EFAULT;
2024 }
2025 return 0;
2026done:
2027 rtnl_shunlock();
2028 return err;
2029}
2030
2031/*
2032 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2033 */
2034int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
2035{
2036 struct inet_sock *inet = inet_sk(sk);
2037 struct ip_mc_socklist *pmc;
2038 struct ip_sf_socklist *psl;
2039 int i;
2040
2041 if (!MULTICAST(loc_addr))
2042 return 1;
2043
2044 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2045 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2046 pmc->multi.imr_ifindex == dif)
2047 break;
2048 }
2049 if (!pmc)
2050 return 1;
2051 psl = pmc->sflist;
2052 if (!psl)
2053 return pmc->sfmode == MCAST_EXCLUDE;
2054
2055 for (i=0; i<psl->sl_count; i++) {
2056 if (psl->sl_addr[i] == rmt_addr)
2057 break;
2058 }
2059 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2060 return 0;
2061 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2062 return 0;
2063 return 1;
2064}
2065
2066/*
2067 * A socket is closing.
2068 */
2069
2070void ip_mc_drop_socket(struct sock *sk)
2071{
2072 struct inet_sock *inet = inet_sk(sk);
2073 struct ip_mc_socklist *iml;
2074
2075 if (inet->mc_list == NULL)
2076 return;
2077
2078 rtnl_lock();
2079 while ((iml = inet->mc_list) != NULL) {
2080 struct in_device *in_dev;
2081 inet->mc_list = iml->next;
2082
2083 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) {
2084 (void) ip_mc_leave_src(sk, iml, in_dev);
2085 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2086 in_dev_put(in_dev);
2087 }
2088 sock_kfree_s(sk, iml, sizeof(*iml));
2089
2090 }
2091 rtnl_unlock();
2092}
2093
2094int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto)
2095{
2096 struct ip_mc_list *im;
2097 struct ip_sf_list *psf;
2098 int rv = 0;
2099
2100 read_lock(&in_dev->mc_list_lock);
2101 for (im=in_dev->mc_list; im; im=im->next) {
2102 if (im->multiaddr == mc_addr)
2103 break;
2104 }
2105 if (im && proto == IPPROTO_IGMP) {
2106 rv = 1;
2107 } else if (im) {
2108 if (src_addr) {
2109 for (psf=im->sources; psf; psf=psf->sf_next) {
2110 if (psf->sf_inaddr == src_addr)
2111 break;
2112 }
2113 if (psf)
2114 rv = psf->sf_count[MCAST_INCLUDE] ||
2115 psf->sf_count[MCAST_EXCLUDE] !=
2116 im->sfcount[MCAST_EXCLUDE];
2117 else
2118 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2119 } else
2120 rv = 1; /* unspecified source; tentatively allow */
2121 }
2122 read_unlock(&in_dev->mc_list_lock);
2123 return rv;
2124}
2125
2126#if defined(CONFIG_PROC_FS)
2127struct igmp_mc_iter_state {
2128 struct net_device *dev;
2129 struct in_device *in_dev;
2130};
2131
2132#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2133
2134static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2135{
2136 struct ip_mc_list *im = NULL;
2137 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2138
2139 for (state->dev = dev_base, state->in_dev = NULL;
2140 state->dev;
2141 state->dev = state->dev->next) {
2142 struct in_device *in_dev;
2143 in_dev = in_dev_get(state->dev);
2144 if (!in_dev)
2145 continue;
2146 read_lock(&in_dev->mc_list_lock);
2147 im = in_dev->mc_list;
2148 if (im) {
2149 state->in_dev = in_dev;
2150 break;
2151 }
2152 read_unlock(&in_dev->mc_list_lock);
2153 in_dev_put(in_dev);
2154 }
2155 return im;
2156}
2157
2158static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2159{
2160 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2161 im = im->next;
2162 while (!im) {
2163 if (likely(state->in_dev != NULL)) {
2164 read_unlock(&state->in_dev->mc_list_lock);
2165 in_dev_put(state->in_dev);
2166 }
2167 state->dev = state->dev->next;
2168 if (!state->dev) {
2169 state->in_dev = NULL;
2170 break;
2171 }
2172 state->in_dev = in_dev_get(state->dev);
2173 if (!state->in_dev)
2174 continue;
2175 read_lock(&state->in_dev->mc_list_lock);
2176 im = state->in_dev->mc_list;
2177 }
2178 return im;
2179}
2180
2181static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2182{
2183 struct ip_mc_list *im = igmp_mc_get_first(seq);
2184 if (im)
2185 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2186 --pos;
2187 return pos ? NULL : im;
2188}
2189
2190static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2191{
2192 read_lock(&dev_base_lock);
2193 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2194}
2195
2196static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2197{
2198 struct ip_mc_list *im;
2199 if (v == SEQ_START_TOKEN)
2200 im = igmp_mc_get_first(seq);
2201 else
2202 im = igmp_mc_get_next(seq, v);
2203 ++*pos;
2204 return im;
2205}
2206
2207static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2208{
2209 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2210 if (likely(state->in_dev != NULL)) {
2211 read_unlock(&state->in_dev->mc_list_lock);
2212 in_dev_put(state->in_dev);
2213 state->in_dev = NULL;
2214 }
2215 state->dev = NULL;
2216 read_unlock(&dev_base_lock);
2217}
2218
2219static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2220{
2221 if (v == SEQ_START_TOKEN)
2222 seq_puts(seq,
2223 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2224 else {
2225 struct ip_mc_list *im = (struct ip_mc_list *)v;
2226 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2227 char *querier;
2228#ifdef CONFIG_IP_MULTICAST
2229 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2230 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2231 "V3";
2232#else
2233 querier = "NONE";
2234#endif
2235
2236 if (state->in_dev->mc_list == im) {
2237 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2238 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2239 }
2240
2241 seq_printf(seq,
2242 "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n",
2243 im->multiaddr, im->users,
2244 im->tm_running, im->tm_running ?
2245 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2246 im->reporter);
2247 }
2248 return 0;
2249}
2250
2251static struct seq_operations igmp_mc_seq_ops = {
2252 .start = igmp_mc_seq_start,
2253 .next = igmp_mc_seq_next,
2254 .stop = igmp_mc_seq_stop,
2255 .show = igmp_mc_seq_show,
2256};
2257
2258static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2259{
2260 struct seq_file *seq;
2261 int rc = -ENOMEM;
2262 struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2263
2264 if (!s)
2265 goto out;
2266 rc = seq_open(file, &igmp_mc_seq_ops);
2267 if (rc)
2268 goto out_kfree;
2269
2270 seq = file->private_data;
2271 seq->private = s;
2272 memset(s, 0, sizeof(*s));
2273out:
2274 return rc;
2275out_kfree:
2276 kfree(s);
2277 goto out;
2278}
2279
2280static struct file_operations igmp_mc_seq_fops = {
2281 .owner = THIS_MODULE,
2282 .open = igmp_mc_seq_open,
2283 .read = seq_read,
2284 .llseek = seq_lseek,
2285 .release = seq_release_private,
2286};
2287
2288struct igmp_mcf_iter_state {
2289 struct net_device *dev;
2290 struct in_device *idev;
2291 struct ip_mc_list *im;
2292};
2293
2294#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2295
2296static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2297{
2298 struct ip_sf_list *psf = NULL;
2299 struct ip_mc_list *im = NULL;
2300 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2301
2302 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2303 state->dev;
2304 state->dev = state->dev->next) {
2305 struct in_device *idev;
2306 idev = in_dev_get(state->dev);
2307 if (unlikely(idev == NULL))
2308 continue;
2309 read_lock(&idev->mc_list_lock);
2310 im = idev->mc_list;
2311 if (likely(im != NULL)) {
2312 spin_lock_bh(&im->lock);
2313 psf = im->sources;
2314 if (likely(psf != NULL)) {
2315 state->im = im;
2316 state->idev = idev;
2317 break;
2318 }
2319 spin_unlock_bh(&im->lock);
2320 }
2321 read_unlock(&idev->mc_list_lock);
2322 in_dev_put(idev);
2323 }
2324 return psf;
2325}
2326
2327static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2328{
2329 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2330
2331 psf = psf->sf_next;
2332 while (!psf) {
2333 spin_unlock_bh(&state->im->lock);
2334 state->im = state->im->next;
2335 while (!state->im) {
2336 if (likely(state->idev != NULL)) {
2337 read_unlock(&state->idev->mc_list_lock);
2338 in_dev_put(state->idev);
2339 }
2340 state->dev = state->dev->next;
2341 if (!state->dev) {
2342 state->idev = NULL;
2343 goto out;
2344 }
2345 state->idev = in_dev_get(state->dev);
2346 if (!state->idev)
2347 continue;
2348 read_lock(&state->idev->mc_list_lock);
2349 state->im = state->idev->mc_list;
2350 }
2351 if (!state->im)
2352 break;
2353 spin_lock_bh(&state->im->lock);
2354 psf = state->im->sources;
2355 }
2356out:
2357 return psf;
2358}
2359
2360static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2361{
2362 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2363 if (psf)
2364 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2365 --pos;
2366 return pos ? NULL : psf;
2367}
2368
2369static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2370{
2371 read_lock(&dev_base_lock);
2372 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2373}
2374
2375static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2376{
2377 struct ip_sf_list *psf;
2378 if (v == SEQ_START_TOKEN)
2379 psf = igmp_mcf_get_first(seq);
2380 else
2381 psf = igmp_mcf_get_next(seq, v);
2382 ++*pos;
2383 return psf;
2384}
2385
2386static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2387{
2388 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2389 if (likely(state->im != NULL)) {
2390 spin_unlock_bh(&state->im->lock);
2391 state->im = NULL;
2392 }
2393 if (likely(state->idev != NULL)) {
2394 read_unlock(&state->idev->mc_list_lock);
2395 in_dev_put(state->idev);
2396 state->idev = NULL;
2397 }
2398 state->dev = NULL;
2399 read_unlock(&dev_base_lock);
2400}
2401
2402static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2403{
2404 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2405 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2406
2407 if (v == SEQ_START_TOKEN) {
2408 seq_printf(seq,
2409 "%3s %6s "
2410 "%10s %10s %6s %6s\n", "Idx",
2411 "Device", "MCA",
2412 "SRC", "INC", "EXC");
2413 } else {
2414 seq_printf(seq,
2415 "%3d %6.6s 0x%08x "
2416 "0x%08x %6lu %6lu\n",
2417 state->dev->ifindex, state->dev->name,
2418 ntohl(state->im->multiaddr),
2419 ntohl(psf->sf_inaddr),
2420 psf->sf_count[MCAST_INCLUDE],
2421 psf->sf_count[MCAST_EXCLUDE]);
2422 }
2423 return 0;
2424}
2425
2426static struct seq_operations igmp_mcf_seq_ops = {
2427 .start = igmp_mcf_seq_start,
2428 .next = igmp_mcf_seq_next,
2429 .stop = igmp_mcf_seq_stop,
2430 .show = igmp_mcf_seq_show,
2431};
2432
2433static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2434{
2435 struct seq_file *seq;
2436 int rc = -ENOMEM;
2437 struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2438
2439 if (!s)
2440 goto out;
2441 rc = seq_open(file, &igmp_mcf_seq_ops);
2442 if (rc)
2443 goto out_kfree;
2444
2445 seq = file->private_data;
2446 seq->private = s;
2447 memset(s, 0, sizeof(*s));
2448out:
2449 return rc;
2450out_kfree:
2451 kfree(s);
2452 goto out;
2453}
2454
2455static struct file_operations igmp_mcf_seq_fops = {
2456 .owner = THIS_MODULE,
2457 .open = igmp_mcf_seq_open,
2458 .read = seq_read,
2459 .llseek = seq_lseek,
2460 .release = seq_release_private,
2461};
2462
2463int __init igmp_mc_proc_init(void)
2464{
2465 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2466 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2467 return 0;
2468}
2469#endif
2470
2471EXPORT_SYMBOL(ip_mc_dec_group);
2472EXPORT_SYMBOL(ip_mc_inc_group);
2473EXPORT_SYMBOL(ip_mc_join_group);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 08:45:15 -0500