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[PATCH] DVB: Documentation and Kconfig updazes
[linux-2.6/history.git] / net / ipv4 / igmp.c
blob9e8bafa72335758abf6a69c5e3a1b75308a3890d
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
139 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
140 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr);
141 static void igmpv3_clear_delrec(struct in_device *in_dev);
142 static int sf_setstate(struct ip_mc_list *pmc);
143 static void sf_markstate(struct ip_mc_list *pmc);
144 #endif
145 static void ip_mc_clear_src(struct ip_mc_list *pmc);
146 int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
147 int sfcount, __u32 *psfsrc, int delta);
148
149 static 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
163 static __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 */
175 static 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
184 static 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
193 static 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
201 static 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
226 static 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
259 static int
260 igmp_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
273 static 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 0;
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 0;
292 }
293 }
294 if (rt->rt_src == 0) {
295 ip_rt_put(rt);
296 return 0;
297 }
298
299 skb->dst = &rt->u.dst;
300 skb->dev = dev;
301
302 skb_reserve(skb, LL_RESERVED_SPACE(dev));
303
304 skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
305
306 pip->version = 4;
307 pip->ihl = (sizeof(struct iphdr)+4)>>2;
308 pip->tos = 0xc0;
309 pip->frag_off = htons(IP_DF);
310 pip->ttl = 1;
311 pip->daddr = rt->rt_dst;
312 pip->saddr = rt->rt_src;
313 pip->protocol = IPPROTO_IGMP;
314 pip->tot_len = 0; /* filled in later */
315 ip_select_ident(pip, &rt->u.dst, NULL);
316 ((u8*)&pip[1])[0] = IPOPT_RA;
317 ((u8*)&pip[1])[1] = 4;
318 ((u8*)&pip[1])[2] = 0;
319 ((u8*)&pip[1])[3] = 0;
320
321 pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig));
322 skb->h.igmph = (struct igmphdr *)pig;
323 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
324 pig->resv1 = 0;
325 pig->csum = 0;
326 pig->resv2 = 0;
327 pig->ngrec = 0;
328 return skb;
329 }
330
331 static int igmpv3_sendpack(struct sk_buff *skb)
332 {
333 struct iphdr *pip = skb->nh.iph;
334 struct igmphdr *pig = skb->h.igmph;
335 int iplen, igmplen;
336
337 iplen = skb->tail - (unsigned char *)skb->nh.iph;
338 pip->tot_len = htons(iplen);
339 ip_send_check(pip);
340
341 igmplen = skb->tail - (unsigned char *)skb->h.igmph;
342 pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen);
343
344 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
345 dst_output);
346 }
347
348 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
349 {
350 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
351 }
352
353 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
354 int type, struct igmpv3_grec **ppgr)
355 {
356 struct net_device *dev = pmc->interface->dev;
357 struct igmpv3_report *pih;
358 struct igmpv3_grec *pgr;
359
360 if (!skb)
361 skb = igmpv3_newpack(dev, dev->mtu);
362 if (!skb)
363 return 0;
364 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
365 pgr->grec_type = type;
366 pgr->grec_auxwords = 0;
367 pgr->grec_nsrcs = 0;
368 pgr->grec_mca = pmc->multiaddr;
369 pih = (struct igmpv3_report *)skb->h.igmph;
370 pih->ngrec = htons(ntohs(pih->ngrec)+1);
371 *ppgr = pgr;
372 return skb;
373 }
374
375 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
376 skb_tailroom(skb)) : 0)
377
378 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
379 int type, int gdeleted, int sdeleted)
380 {
381 struct net_device *dev = pmc->interface->dev;
382 struct igmpv3_report *pih;
383 struct igmpv3_grec *pgr = 0;
384 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
385 int scount, first, isquery, truncate;
386
387 if (pmc->multiaddr == IGMP_ALL_HOSTS)
388 return skb;
389
390 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
391 type == IGMPV3_MODE_IS_EXCLUDE;
392 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
393 type == IGMPV3_CHANGE_TO_EXCLUDE;
394
395 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
396
397 if (!*psf_list) {
398 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
399 type == IGMPV3_BLOCK_OLD_SOURCES)
400 return skb;
401 if (pmc->crcount || isquery) {
402 /* make sure we have room for group header and at
403 * least one source.
404 */
405 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)+
406 sizeof(__u32)) {
407 igmpv3_sendpack(skb);
408 skb = 0; /* add_grhead will get a new one */
409 }
410 skb = add_grhead(skb, pmc, type, &pgr);
411 }
412 return skb;
413 }
414 pih = skb ? (struct igmpv3_report *)skb->h.igmph : 0;
415
416 /* EX and TO_EX get a fresh packet, if needed */
417 if (truncate) {
418 if (pih && pih->ngrec &&
419 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
420 if (skb)
421 igmpv3_sendpack(skb);
422 skb = igmpv3_newpack(dev, dev->mtu);
423 }
424 }
425 first = 1;
426 scount = 0;
427 psf_prev = 0;
428 for (psf=*psf_list; psf; psf=psf_next) {
429 u32 *psrc;
430
431 psf_next = psf->sf_next;
432
433 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
434 psf_prev = psf;
435 continue;
436 }
437
438 /* clear marks on query responses */
439 if (isquery)
440 psf->sf_gsresp = 0;
441
442 if (AVAILABLE(skb) < sizeof(u32) +
443 first*sizeof(struct igmpv3_grec)) {
444 if (truncate && !first)
445 break; /* truncate these */
446 if (pgr)
447 pgr->grec_nsrcs = htons(scount);
448 if (skb)
449 igmpv3_sendpack(skb);
450 skb = igmpv3_newpack(dev, dev->mtu);
451 first = 1;
452 scount = 0;
453 }
454 if (first) {
455 skb = add_grhead(skb, pmc, type, &pgr);
456 first = 0;
457 }
458 psrc = (u32 *)skb_put(skb, sizeof(u32));
459 *psrc = psf->sf_inaddr;
460 scount++;
461 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
462 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
463 psf->sf_crcount--;
464 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
465 if (psf_prev)
466 psf_prev->sf_next = psf->sf_next;
467 else
468 *psf_list = psf->sf_next;
469 kfree(psf);
470 continue;
471 }
472 }
473 psf_prev = psf;
474 }
475 if (pgr)
476 pgr->grec_nsrcs = htons(scount);
477
478 if (isquery)
479 pmc->gsquery = 0; /* clear query state on report */
480 return skb;
481 }
482
483 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
484 {
485 struct sk_buff *skb = 0;
486 int type;
487
488 if (!pmc) {
489 read_lock(&in_dev->lock);
490 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
491 if (pmc->multiaddr == IGMP_ALL_HOSTS)
492 continue;
493 spin_lock_bh(&pmc->lock);
494 if (pmc->sfcount[MCAST_EXCLUDE])
495 type = IGMPV3_MODE_IS_EXCLUDE;
496 else
497 type = IGMPV3_MODE_IS_INCLUDE;
498 skb = add_grec(skb, pmc, type, 0, 0);
499 spin_unlock_bh(&pmc->lock);
500 }
501 read_unlock(&in_dev->lock);
502 } else {
503 spin_lock_bh(&pmc->lock);
504 if (pmc->sfcount[MCAST_EXCLUDE])
505 type = IGMPV3_MODE_IS_EXCLUDE;
506 else
507 type = IGMPV3_MODE_IS_INCLUDE;
508 skb = add_grec(skb, pmc, type, 0, 0);
509 spin_unlock_bh(&pmc->lock);
510 }
511 if (!skb)
512 return 0;
513 return igmpv3_sendpack(skb);
514 }
515
516 /*
517 * remove zero-count source records from a source filter list
518 */
519 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
520 {
521 struct ip_sf_list *psf_prev, *psf_next, *psf;
522
523 psf_prev = 0;
524 for (psf=*ppsf; psf; psf = psf_next) {
525 psf_next = psf->sf_next;
526 if (psf->sf_crcount == 0) {
527 if (psf_prev)
528 psf_prev->sf_next = psf->sf_next;
529 else
530 *ppsf = psf->sf_next;
531 kfree(psf);
532 } else
533 psf_prev = psf;
534 }
535 }
536
537 static void igmpv3_send_cr(struct in_device *in_dev)
538 {
539 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
540 struct sk_buff *skb = 0;
541 int type, dtype;
542
543 read_lock(&in_dev->lock);
544 write_lock_bh(&in_dev->mc_lock);
545
546 /* deleted MCA's */
547 pmc_prev = 0;
548 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
549 pmc_next = pmc->next;
550 if (pmc->sfmode == MCAST_INCLUDE) {
551 type = IGMPV3_BLOCK_OLD_SOURCES;
552 dtype = IGMPV3_BLOCK_OLD_SOURCES;
553 skb = add_grec(skb, pmc, type, 1, 0);
554 skb = add_grec(skb, pmc, dtype, 1, 1);
555 }
556 if (pmc->crcount) {
557 pmc->crcount--;
558 if (pmc->sfmode == MCAST_EXCLUDE) {
559 type = IGMPV3_CHANGE_TO_INCLUDE;
560 skb = add_grec(skb, pmc, type, 1, 0);
561 }
562 if (pmc->crcount == 0) {
563 igmpv3_clear_zeros(&pmc->tomb);
564 igmpv3_clear_zeros(&pmc->sources);
565 }
566 }
567 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
568 if (pmc_prev)
569 pmc_prev->next = pmc_next;
570 else
571 in_dev->mc_tomb = pmc_next;
572 in_dev_put(pmc->interface);
573 kfree(pmc);
574 } else
575 pmc_prev = pmc;
576 }
577 write_unlock_bh(&in_dev->mc_lock);
578
579 /* change recs */
580 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
581 spin_lock_bh(&pmc->lock);
582 if (pmc->sfcount[MCAST_EXCLUDE]) {
583 type = IGMPV3_BLOCK_OLD_SOURCES;
584 dtype = IGMPV3_ALLOW_NEW_SOURCES;
585 } else {
586 type = IGMPV3_ALLOW_NEW_SOURCES;
587 dtype = IGMPV3_BLOCK_OLD_SOURCES;
588 }
589 skb = add_grec(skb, pmc, type, 0, 0);
590 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
591
592 /* filter mode changes */
593 if (pmc->crcount) {
594 pmc->crcount--;
595 if (pmc->sfmode == MCAST_EXCLUDE)
596 type = IGMPV3_CHANGE_TO_EXCLUDE;
597 else
598 type = IGMPV3_CHANGE_TO_INCLUDE;
599 skb = add_grec(skb, pmc, type, 0, 0);
600 }
601 spin_unlock_bh(&pmc->lock);
602 }
603 read_unlock(&in_dev->lock);
604 if (!skb)
605 return;
606 (void) igmpv3_sendpack(skb);
607 }
608
609 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
610 int type)
611 {
612 struct sk_buff *skb;
613 struct iphdr *iph;
614 struct igmphdr *ih;
615 struct rtable *rt;
616 struct net_device *dev = in_dev->dev;
617 u32 group = pmc ? pmc->multiaddr : 0;
618 u32 dst;
619
620 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
621 return igmpv3_send_report(in_dev, pmc);
622 else if (type == IGMP_HOST_LEAVE_MESSAGE)
623 dst = IGMP_ALL_ROUTER;
624 else
625 dst = group;
626
627 {
628 struct flowi fl = { .oif = dev->ifindex,
629 .nl_u = { .ip4_u = { .daddr = dst } },
630 .proto = IPPROTO_IGMP };
631 if (ip_route_output_key(&rt, &fl))
632 return -1;
633 }
634 if (rt->rt_src == 0) {
635 ip_rt_put(rt);
636 return -1;
637 }
638
639 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
640 if (skb == NULL) {
641 ip_rt_put(rt);
642 return -1;
643 }
644
645 skb->dst = &rt->u.dst;
646
647 skb_reserve(skb, LL_RESERVED_SPACE(dev));
648
649 skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
650
651 iph->version = 4;
652 iph->ihl = (sizeof(struct iphdr)+4)>>2;
653 iph->tos = 0xc0;
654 iph->frag_off = htons(IP_DF);
655 iph->ttl = 1;
656 iph->daddr = dst;
657 iph->saddr = rt->rt_src;
658 iph->protocol = IPPROTO_IGMP;
659 iph->tot_len = htons(IGMP_SIZE);
660 ip_select_ident(iph, &rt->u.dst, NULL);
661 ((u8*)&iph[1])[0] = IPOPT_RA;
662 ((u8*)&iph[1])[1] = 4;
663 ((u8*)&iph[1])[2] = 0;
664 ((u8*)&iph[1])[3] = 0;
665 ip_send_check(iph);
666
667 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
668 ih->type=type;
669 ih->code=0;
670 ih->csum=0;
671 ih->group=group;
672 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
673
674 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
675 dst_output);
676 }
677
678 static void igmp_gq_timer_expire(unsigned long data)
679 {
680 struct in_device *in_dev = (struct in_device *)data;
681
682 in_dev->mr_gq_running = 0;
683 igmpv3_send_report(in_dev, 0);
684 __in_dev_put(in_dev);
685 }
686
687 static void igmp_ifc_timer_expire(unsigned long data)
688 {
689 struct in_device *in_dev = (struct in_device *)data;
690
691 igmpv3_send_cr(in_dev);
692 if (in_dev->mr_ifc_count) {
693 in_dev->mr_ifc_count--;
694 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
695 }
696 __in_dev_put(in_dev);
697 }
698
699 static void igmp_ifc_event(struct in_device *in_dev)
700 {
701 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
702 return;
703 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
704 IGMP_Unsolicited_Report_Count;
705 igmp_ifc_start_timer(in_dev, 1);
706 }
707
708
709 static void igmp_timer_expire(unsigned long data)
710 {
711 struct ip_mc_list *im=(struct ip_mc_list *)data;
712 struct in_device *in_dev = im->interface;
713
714 spin_lock(&im->lock);
715 im->tm_running=0;
716
717 if (im->unsolicit_count) {
718 im->unsolicit_count--;
719 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
720 }
721 im->reporter = 1;
722 spin_unlock(&im->lock);
723
724 if (IGMP_V1_SEEN(in_dev))
725 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
726 else if (IGMP_V2_SEEN(in_dev))
727 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
728 else
729 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
730
731 ip_ma_put(im);
732 }
733
734 static void igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs)
735 {
736 struct ip_sf_list *psf;
737 int i, scount;
738
739 scount = 0;
740 for (psf=pmc->sources; psf; psf=psf->sf_next) {
741 if (scount == nsrcs)
742 break;
743 for (i=0; i<nsrcs; i++)
744 if (srcs[i] == psf->sf_inaddr) {
745 psf->sf_gsresp = 1;
746 scount++;
747 break;
748 }
749 }
750 }
751
752 static void igmp_heard_report(struct in_device *in_dev, u32 group)
753 {
754 struct ip_mc_list *im;
755
756 /* Timers are only set for non-local groups */
757
758 if (group == IGMP_ALL_HOSTS)
759 return;
760
761 read_lock(&in_dev->lock);
762 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
763 if (im->multiaddr == group) {
764 igmp_stop_timer(im);
765 break;
766 }
767 }
768 read_unlock(&in_dev->lock);
769 }
770
771 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
772 int len)
773 {
774 struct igmphdr *ih = skb->h.igmph;
775 struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
776 struct ip_mc_list *im;
777 u32 group = ih->group;
778 int max_delay;
779 int mark = 0;
780
781
782 if (len == 8) {
783 if (ih->code == 0) {
784 /* Alas, old v1 router presents here. */
785
786 max_delay = IGMP_Query_Response_Interval;
787 in_dev->mr_v1_seen = jiffies +
788 IGMP_V1_Router_Present_Timeout;
789 group = 0;
790 } else {
791 /* v2 router present */
792 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
793 in_dev->mr_v2_seen = jiffies +
794 IGMP_V2_Router_Present_Timeout;
795 }
796 /* cancel the interface change timer */
797 in_dev->mr_ifc_count = 0;
798 if (del_timer(&in_dev->mr_ifc_timer))
799 __in_dev_put(in_dev);
800 /* clear deleted report items */
801 igmpv3_clear_delrec(in_dev);
802 } else if (len < 12) {
803 return; /* ignore bogus packet; freed by caller */
804 } else { /* v3 */
805 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
806 return;
807
808 ih3 = (struct igmpv3_query *) skb->h.raw;
809 if (ih3->nsrcs) {
810 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
811 + ntohs(ih3->nsrcs)*sizeof(__u32)))
812 return;
813 ih3 = (struct igmpv3_query *) skb->h.raw;
814 }
815
816 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
817 if (!max_delay)
818 max_delay = 1; /* can't mod w/ 0 */
819 in_dev->mr_maxdelay = max_delay;
820 if (ih3->qrv)
821 in_dev->mr_qrv = ih3->qrv;
822 if (!group) { /* general query */
823 if (ih3->nsrcs)
824 return; /* no sources allowed */
825 igmp_gq_start_timer(in_dev);
826 return;
827 }
828 /* mark sources to include, if group & source-specific */
829 mark = ih3->nsrcs != 0;
830 }
831
832 /*
833 * - Start the timers in all of our membership records
834 * that the query applies to for the interface on
835 * which the query arrived excl. those that belong
836 * to a "local" group (224.0.0.X)
837 * - For timers already running check if they need to
838 * be reset.
839 * - Use the igmp->igmp_code field as the maximum
840 * delay possible
841 */
842 read_lock(&in_dev->lock);
843 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
844 if (group && group != im->multiaddr)
845 continue;
846 if (im->multiaddr == IGMP_ALL_HOSTS)
847 continue;
848 spin_lock_bh(&im->lock);
849 if (im->tm_running)
850 im->gsquery = im->gsquery && mark;
851 else
852 im->gsquery = mark;
853 if (im->gsquery)
854 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
855 spin_unlock_bh(&im->lock);
856 igmp_mod_timer(im, max_delay);
857 }
858 read_unlock(&in_dev->lock);
859 }
860
861 int igmp_rcv(struct sk_buff *skb)
862 {
863 /* This basically follows the spec line by line -- see RFC1112 */
864 struct igmphdr *ih;
865 struct in_device *in_dev = in_dev_get(skb->dev);
866 int len = skb->len;
867
868 if (in_dev==NULL) {
869 kfree_skb(skb);
870 return 0;
871 }
872
873 if (!pskb_may_pull(skb, sizeof(struct igmphdr)) ||
874 (u16)csum_fold(skb_checksum(skb, 0, len, 0))) {
875 in_dev_put(in_dev);
876 kfree_skb(skb);
877 return 0;
878 }
879
880 ih = skb->h.igmph;
881 switch (ih->type) {
882 case IGMP_HOST_MEMBERSHIP_QUERY:
883 igmp_heard_query(in_dev, skb, len);
884 break;
885 case IGMP_HOST_MEMBERSHIP_REPORT:
886 case IGMPV2_HOST_MEMBERSHIP_REPORT:
887 case IGMPV3_HOST_MEMBERSHIP_REPORT:
888 /* Is it our report looped back? */
889 if (((struct rtable*)skb->dst)->fl.iif == 0)
890 break;
891 igmp_heard_report(in_dev, ih->group);
892 break;
893 case IGMP_PIM:
894 #ifdef CONFIG_IP_PIMSM_V1
895 in_dev_put(in_dev);
896 return pim_rcv_v1(skb);
897 #endif
898 case IGMP_DVMRP:
899 case IGMP_TRACE:
900 case IGMP_HOST_LEAVE_MESSAGE:
901 case IGMP_MTRACE:
902 case IGMP_MTRACE_RESP:
903 break;
904 default:
905 NETDEBUG(printk(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type));
906 }
907 in_dev_put(in_dev);
908 kfree_skb(skb);
909 return 0;
910 }
911
912 #endif
913
914
915 /*
916 * Add a filter to a device
917 */
918
919 static void ip_mc_filter_add(struct in_device *in_dev, u32 addr)
920 {
921 char buf[MAX_ADDR_LEN];
922 struct net_device *dev = in_dev->dev;
923
924 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
925 We will get multicast token leakage, when IFF_MULTICAST
926 is changed. This check should be done in dev->set_multicast_list
927 routine. Something sort of:
928 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
929 --ANK
930 */
931 if (arp_mc_map(addr, buf, dev, 0) == 0)
932 dev_mc_add(dev,buf,dev->addr_len,0);
933 }
934
935 /*
936 * Remove a filter from a device
937 */
938
939 static void ip_mc_filter_del(struct in_device *in_dev, u32 addr)
940 {
941 char buf[MAX_ADDR_LEN];
942 struct net_device *dev = in_dev->dev;
943
944 if (arp_mc_map(addr, buf, dev, 0) == 0)
945 dev_mc_delete(dev,buf,dev->addr_len,0);
946 }
947
948 #ifdef CONFIG_IP_MULTICAST
949 /*
950 * deleted ip_mc_list manipulation
951 */
952 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
953 {
954 struct ip_mc_list *pmc;
955
956 /* this is an "ip_mc_list" for convenience; only the fields below
957 * are actually used. In particular, the refcnt and users are not
958 * used for management of the delete list. Using the same structure
959 * for deleted items allows change reports to use common code with
960 * non-deleted or query-response MCA's.
961 */
962 pmc = (struct ip_mc_list *)kmalloc(sizeof(*pmc), GFP_KERNEL);
963 if (!pmc)
964 return;
965 memset(pmc, 0, sizeof(*pmc));
966 spin_lock_bh(&im->lock);
967 pmc->interface = im->interface;
968 in_dev_hold(in_dev);
969 pmc->multiaddr = im->multiaddr;
970 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
971 IGMP_Unsolicited_Report_Count;
972 pmc->sfmode = im->sfmode;
973 if (pmc->sfmode == MCAST_INCLUDE) {
974 struct ip_sf_list *psf;
975
976 pmc->tomb = im->tomb;
977 pmc->sources = im->sources;
978 im->tomb = im->sources = 0;
979 for (psf=pmc->sources; psf; psf=psf->sf_next)
980 psf->sf_crcount = pmc->crcount;
981 }
982 spin_unlock_bh(&im->lock);
983
984 write_lock_bh(&in_dev->mc_lock);
985 pmc->next = in_dev->mc_tomb;
986 in_dev->mc_tomb = pmc;
987 write_unlock_bh(&in_dev->mc_lock);
988 }
989
990 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr)
991 {
992 struct ip_mc_list *pmc, *pmc_prev;
993 struct ip_sf_list *psf, *psf_next;
994
995 write_lock_bh(&in_dev->mc_lock);
996 pmc_prev = 0;
997 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
998 if (pmc->multiaddr == multiaddr)
999 break;
1000 pmc_prev = pmc;
1001 }
1002 if (pmc) {
1003 if (pmc_prev)
1004 pmc_prev->next = pmc->next;
1005 else
1006 in_dev->mc_tomb = pmc->next;
1007 }
1008 write_unlock_bh(&in_dev->mc_lock);
1009 if (pmc) {
1010 for (psf=pmc->tomb; psf; psf=psf_next) {
1011 psf_next = psf->sf_next;
1012 kfree(psf);
1013 }
1014 in_dev_put(pmc->interface);
1015 kfree(pmc);
1016 }
1017 }
1018
1019 static void igmpv3_clear_delrec(struct in_device *in_dev)
1020 {
1021 struct ip_mc_list *pmc, *nextpmc;
1022
1023 write_lock_bh(&in_dev->mc_lock);
1024 pmc = in_dev->mc_tomb;
1025 in_dev->mc_tomb = 0;
1026 write_unlock_bh(&in_dev->mc_lock);
1027
1028 for (; pmc; pmc = nextpmc) {
1029 nextpmc = pmc->next;
1030 ip_mc_clear_src(pmc);
1031 in_dev_put(pmc->interface);
1032 kfree(pmc);
1033 }
1034 /* clear dead sources, too */
1035 read_lock(&in_dev->lock);
1036 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1037 struct ip_sf_list *psf, *psf_next;
1038
1039 spin_lock_bh(&pmc->lock);
1040 psf = pmc->tomb;
1041 pmc->tomb = 0;
1042 spin_unlock_bh(&pmc->lock);
1043 for (; psf; psf=psf_next) {
1044 psf_next = psf->sf_next;
1045 kfree(psf);
1046 }
1047 }
1048 read_unlock(&in_dev->lock);
1049 }
1050 #endif
1051
1052 static void igmp_group_dropped(struct ip_mc_list *im)
1053 {
1054 struct in_device *in_dev = im->interface;
1055 #ifdef CONFIG_IP_MULTICAST
1056 int reporter;
1057 #endif
1058
1059 if (im->loaded) {
1060 im->loaded = 0;
1061 ip_mc_filter_del(in_dev, im->multiaddr);
1062 }
1063
1064 #ifdef CONFIG_IP_MULTICAST
1065 if (im->multiaddr == IGMP_ALL_HOSTS)
1066 return;
1067
1068 reporter = im->reporter;
1069 igmp_stop_timer(im);
1070
1071 if (!in_dev->dead) {
1072 if (IGMP_V1_SEEN(in_dev))
1073 goto done;
1074 if (IGMP_V2_SEEN(in_dev)) {
1075 if (reporter)
1076 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1077 goto done;
1078 }
1079 /* IGMPv3 */
1080 igmpv3_add_delrec(in_dev, im);
1081
1082 igmp_ifc_event(in_dev);
1083 }
1084 done:
1085 #endif
1086 ip_mc_clear_src(im);
1087 }
1088
1089 static void igmp_group_added(struct ip_mc_list *im)
1090 {
1091 struct in_device *in_dev = im->interface;
1092
1093 if (im->loaded == 0) {
1094 im->loaded = 1;
1095 ip_mc_filter_add(in_dev, im->multiaddr);
1096 }
1097
1098 #ifdef CONFIG_IP_MULTICAST
1099 if (im->multiaddr == IGMP_ALL_HOSTS)
1100 return;
1101
1102 if (in_dev->dead)
1103 return;
1104 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1105 spin_lock_bh(&im->lock);
1106 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1107 spin_unlock_bh(&im->lock);
1108 return;
1109 }
1110 /* else, v3 */
1111
1112 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1113 IGMP_Unsolicited_Report_Count;
1114 igmp_ifc_event(in_dev);
1115 #endif
1116 }
1117
1118
1119 /*
1120 * Multicast list managers
1121 */
1122
1123
1124 /*
1125 * A socket has joined a multicast group on device dev.
1126 */
1127
1128 void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
1129 {
1130 struct ip_mc_list *im;
1131
1132 ASSERT_RTNL();
1133
1134 for (im=in_dev->mc_list; im; im=im->next) {
1135 if (im->multiaddr == addr) {
1136 im->users++;
1137 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, 0, 0);
1138 goto out;
1139 }
1140 }
1141
1142 im = (struct ip_mc_list *)kmalloc(sizeof(*im), GFP_KERNEL);
1143 if (!im)
1144 goto out;
1145
1146 im->users=1;
1147 im->interface=in_dev;
1148 in_dev_hold(in_dev);
1149 im->multiaddr=addr;
1150 /* initial mode is (EX, empty) */
1151 im->sfmode = MCAST_EXCLUDE;
1152 im->sfcount[MCAST_INCLUDE] = 0;
1153 im->sfcount[MCAST_EXCLUDE] = 1;
1154 im->sources = 0;
1155 im->tomb = 0;
1156 im->crcount = 0;
1157 atomic_set(&im->refcnt, 1);
1158 spin_lock_init(&im->lock);
1159 #ifdef CONFIG_IP_MULTICAST
1160 im->tm_running=0;
1161 init_timer(&im->timer);
1162 im->timer.data=(unsigned long)im;
1163 im->timer.function=&igmp_timer_expire;
1164 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1165 im->reporter = 0;
1166 im->gsquery = 0;
1167 #endif
1168 im->loaded = 0;
1169 write_lock_bh(&in_dev->lock);
1170 im->next=in_dev->mc_list;
1171 in_dev->mc_list=im;
1172 write_unlock_bh(&in_dev->lock);
1173 #ifdef CONFIG_IP_MULTICAST
1174 igmpv3_del_delrec(in_dev, im->multiaddr);
1175 #endif
1176 igmp_group_added(im);
1177 if (!in_dev->dead)
1178 ip_rt_multicast_event(in_dev);
1179 out:
1180 return;
1181 }
1182
1183 /*
1184 * A socket has left a multicast group on device dev
1185 */
1186
1187 void ip_mc_dec_group(struct in_device *in_dev, u32 addr)
1188 {
1189 struct ip_mc_list *i, **ip;
1190
1191 ASSERT_RTNL();
1192
1193 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1194 if (i->multiaddr==addr) {
1195 if (--i->users == 0) {
1196 write_lock_bh(&in_dev->lock);
1197 *ip = i->next;
1198 write_unlock_bh(&in_dev->lock);
1199 igmp_group_dropped(i);
1200
1201 if (!in_dev->dead)
1202 ip_rt_multicast_event(in_dev);
1203
1204 ip_ma_put(i);
1205 return;
1206 }
1207 break;
1208 }
1209 }
1210 }
1211
1212 /* Device going down */
1213
1214 void ip_mc_down(struct in_device *in_dev)
1215 {
1216 struct ip_mc_list *i;
1217
1218 ASSERT_RTNL();
1219
1220 for (i=in_dev->mc_list; i; i=i->next)
1221 igmp_group_dropped(i);
1222
1223 #ifdef CONFIG_IP_MULTICAST
1224 in_dev->mr_ifc_count = 0;
1225 if (del_timer(&in_dev->mr_ifc_timer))
1226 __in_dev_put(in_dev);
1227 in_dev->mr_gq_running = 0;
1228 if (del_timer(&in_dev->mr_gq_timer))
1229 __in_dev_put(in_dev);
1230 igmpv3_clear_delrec(in_dev);
1231 #endif
1232
1233 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1234 }
1235
1236 void ip_mc_init_dev(struct in_device *in_dev)
1237 {
1238 ASSERT_RTNL();
1239
1240 in_dev->mc_tomb = 0;
1241 #ifdef CONFIG_IP_MULTICAST
1242 in_dev->mr_gq_running = 0;
1243 init_timer(&in_dev->mr_gq_timer);
1244 in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1245 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1246 in_dev->mr_ifc_count = 0;
1247 init_timer(&in_dev->mr_ifc_timer);
1248 in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1249 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1250 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1251 #endif
1252
1253 in_dev->mc_lock = RW_LOCK_UNLOCKED;
1254 }
1255
1256 /* Device going up */
1257
1258 void ip_mc_up(struct in_device *in_dev)
1259 {
1260 struct ip_mc_list *i;
1261
1262 ASSERT_RTNL();
1263
1264 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1265
1266 for (i=in_dev->mc_list; i; i=i->next)
1267 igmp_group_added(i);
1268 }
1269
1270 /*
1271 * Device is about to be destroyed: clean up.
1272 */
1273
1274 void ip_mc_destroy_dev(struct in_device *in_dev)
1275 {
1276 struct ip_mc_list *i;
1277
1278 ASSERT_RTNL();
1279
1280 /* Deactivate timers */
1281 ip_mc_down(in_dev);
1282
1283 write_lock_bh(&in_dev->lock);
1284 while ((i = in_dev->mc_list) != NULL) {
1285 in_dev->mc_list = i->next;
1286 write_unlock_bh(&in_dev->lock);
1287
1288 igmp_group_dropped(i);
1289 ip_ma_put(i);
1290
1291 write_lock_bh(&in_dev->lock);
1292 }
1293 write_unlock_bh(&in_dev->lock);
1294 }
1295
1296 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1297 {
1298 struct flowi fl = { .nl_u = { .ip4_u =
1299 { .daddr = imr->imr_multiaddr.s_addr } } };
1300 struct rtable *rt;
1301 struct net_device *dev = NULL;
1302 struct in_device *idev = NULL;
1303
1304 if (imr->imr_ifindex) {
1305 idev = inetdev_by_index(imr->imr_ifindex);
1306 if (idev)
1307 __in_dev_put(idev);
1308 return idev;
1309 }
1310 if (imr->imr_address.s_addr) {
1311 dev = ip_dev_find(imr->imr_address.s_addr);
1312 if (!dev)
1313 return NULL;
1314 __dev_put(dev);
1315 }
1316
1317 if (!dev && !ip_route_output_key(&rt, &fl)) {
1318 dev = rt->u.dst.dev;
1319 ip_rt_put(rt);
1320 }
1321 if (dev) {
1322 imr->imr_ifindex = dev->ifindex;
1323 idev = __in_dev_get(dev);
1324 }
1325 return idev;
1326 }
1327
1328 /*
1329 * Join a socket to a group
1330 */
1331 int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS;
1332 int sysctl_igmp_max_msf = IP_MAX_MSF;
1333
1334
1335 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1336 __u32 *psfsrc)
1337 {
1338 struct ip_sf_list *psf, *psf_prev;
1339 int rv = 0;
1340
1341 psf_prev = 0;
1342 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1343 if (psf->sf_inaddr == *psfsrc)
1344 break;
1345 psf_prev = psf;
1346 }
1347 if (!psf || psf->sf_count[sfmode] == 0) {
1348 /* source filter not found, or count wrong => bug */
1349 return -ESRCH;
1350 }
1351 psf->sf_count[sfmode]--;
1352 if (psf->sf_count[sfmode] == 0) {
1353 ip_rt_multicast_event(pmc->interface);
1354 }
1355 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1356 #ifdef CONFIG_IP_MULTICAST
1357 struct in_device *in_dev = pmc->interface;
1358 #endif
1359
1360 /* no more filters for this source */
1361 if (psf_prev)
1362 psf_prev->sf_next = psf->sf_next;
1363 else
1364 pmc->sources = psf->sf_next;
1365 #ifdef CONFIG_IP_MULTICAST
1366 if (psf->sf_oldin &&
1367 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1368 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1369 IGMP_Unsolicited_Report_Count;
1370 psf->sf_next = pmc->tomb;
1371 pmc->tomb = psf;
1372 rv = 1;
1373 } else
1374 #endif
1375 kfree(psf);
1376 }
1377 return rv;
1378 }
1379
1380 #ifndef CONFIG_IP_MULTICAST
1381 #define igmp_ifc_event(x) do { } while (0)
1382 #endif
1383
1384 int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1385 int sfcount, __u32 *psfsrc, int delta)
1386 {
1387 struct ip_mc_list *pmc;
1388 int changerec = 0;
1389 int i, err;
1390
1391 if (!in_dev)
1392 return -ENODEV;
1393 read_lock(&in_dev->lock);
1394 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1395 if (*pmca == pmc->multiaddr)
1396 break;
1397 }
1398 if (!pmc) {
1399 /* MCA not found?? bug */
1400 read_unlock(&in_dev->lock);
1401 return -ESRCH;
1402 }
1403 spin_lock_bh(&pmc->lock);
1404 read_unlock(&in_dev->lock);
1405 #ifdef CONFIG_IP_MULTICAST
1406 sf_markstate(pmc);
1407 #endif
1408 if (!delta) {
1409 err = -EINVAL;
1410 if (!pmc->sfcount[sfmode])
1411 goto out_unlock;
1412 pmc->sfcount[sfmode]--;
1413 }
1414 err = 0;
1415 for (i=0; i<sfcount; i++) {
1416 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1417
1418 changerec |= rv > 0;
1419 if (!err && rv < 0)
1420 err = rv;
1421 }
1422 if (pmc->sfmode == MCAST_EXCLUDE &&
1423 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1424 pmc->sfcount[MCAST_INCLUDE]) {
1425 #ifdef CONFIG_IP_MULTICAST
1426 struct ip_sf_list *psf;
1427 #endif
1428
1429 /* filter mode change */
1430 pmc->sfmode = MCAST_INCLUDE;
1431 #ifdef CONFIG_IP_MULTICAST
1432 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1433 IGMP_Unsolicited_Report_Count;
1434 in_dev->mr_ifc_count = pmc->crcount;
1435 for (psf=pmc->sources; psf; psf = psf->sf_next)
1436 psf->sf_crcount = 0;
1437 igmp_ifc_event(pmc->interface);
1438 } else if (sf_setstate(pmc) || changerec) {
1439 igmp_ifc_event(pmc->interface);
1440 #endif
1441 }
1442 out_unlock:
1443 spin_unlock_bh(&pmc->lock);
1444 return err;
1445 }
1446
1447 /*
1448 * Add multicast single-source filter to the interface list
1449 */
1450 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1451 __u32 *psfsrc, int delta)
1452 {
1453 struct ip_sf_list *psf, *psf_prev;
1454
1455 psf_prev = 0;
1456 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1457 if (psf->sf_inaddr == *psfsrc)
1458 break;
1459 psf_prev = psf;
1460 }
1461 if (!psf) {
1462 psf = (struct ip_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1463 if (!psf)
1464 return -ENOBUFS;
1465 memset(psf, 0, sizeof(*psf));
1466 psf->sf_inaddr = *psfsrc;
1467 if (psf_prev) {
1468 psf_prev->sf_next = psf;
1469 } else
1470 pmc->sources = psf;
1471 }
1472 psf->sf_count[sfmode]++;
1473 if (psf->sf_count[sfmode] == 1) {
1474 ip_rt_multicast_event(pmc->interface);
1475 }
1476 return 0;
1477 }
1478
1479 #ifdef CONFIG_IP_MULTICAST
1480 static void sf_markstate(struct ip_mc_list *pmc)
1481 {
1482 struct ip_sf_list *psf;
1483 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1484
1485 for (psf=pmc->sources; psf; psf=psf->sf_next)
1486 if (pmc->sfcount[MCAST_EXCLUDE]) {
1487 psf->sf_oldin = mca_xcount ==
1488 psf->sf_count[MCAST_EXCLUDE] &&
1489 !psf->sf_count[MCAST_INCLUDE];
1490 } else
1491 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1492 }
1493
1494 static int sf_setstate(struct ip_mc_list *pmc)
1495 {
1496 struct ip_sf_list *psf;
1497 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1498 int qrv = pmc->interface->mr_qrv;
1499 int new_in, rv;
1500
1501 rv = 0;
1502 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1503 if (pmc->sfcount[MCAST_EXCLUDE]) {
1504 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1505 !psf->sf_count[MCAST_INCLUDE];
1506 } else
1507 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1508 if (new_in != psf->sf_oldin) {
1509 psf->sf_crcount = qrv;
1510 rv++;
1511 }
1512 }
1513 return rv;
1514 }
1515 #endif
1516
1517 /*
1518 * Add multicast source filter list to the interface list
1519 */
1520 int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1521 int sfcount, __u32 *psfsrc, int delta)
1522 {
1523 struct ip_mc_list *pmc;
1524 int isexclude;
1525 int i, err;
1526
1527 if (!in_dev)
1528 return -ENODEV;
1529 read_lock(&in_dev->lock);
1530 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1531 if (*pmca == pmc->multiaddr)
1532 break;
1533 }
1534 if (!pmc) {
1535 /* MCA not found?? bug */
1536 read_unlock(&in_dev->lock);
1537 return -ESRCH;
1538 }
1539 spin_lock_bh(&pmc->lock);
1540 read_unlock(&in_dev->lock);
1541
1542 #ifdef CONFIG_IP_MULTICAST
1543 sf_markstate(pmc);
1544 #endif
1545 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1546 if (!delta)
1547 pmc->sfcount[sfmode]++;
1548 err = 0;
1549 for (i=0; i<sfcount; i++) {
1550 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1551 if (err)
1552 break;
1553 }
1554 if (err) {
1555 int j;
1556
1557 pmc->sfcount[sfmode]--;
1558 for (j=0; j<i; j++)
1559 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1560 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1561 #ifdef CONFIG_IP_MULTICAST
1562 struct in_device *in_dev = pmc->interface;
1563 struct ip_sf_list *psf;
1564 #endif
1565
1566 /* filter mode change */
1567 if (pmc->sfcount[MCAST_EXCLUDE])
1568 pmc->sfmode = MCAST_EXCLUDE;
1569 else if (pmc->sfcount[MCAST_INCLUDE])
1570 pmc->sfmode = MCAST_INCLUDE;
1571 #ifdef CONFIG_IP_MULTICAST
1572 /* else no filters; keep old mode for reports */
1573
1574 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1575 IGMP_Unsolicited_Report_Count;
1576 in_dev->mr_ifc_count = pmc->crcount;
1577 for (psf=pmc->sources; psf; psf = psf->sf_next)
1578 psf->sf_crcount = 0;
1579 igmp_ifc_event(in_dev);
1580 } else if (sf_setstate(pmc)) {
1581 igmp_ifc_event(in_dev);
1582 #endif
1583 }
1584 spin_unlock_bh(&pmc->lock);
1585 return err;
1586 }
1587
1588 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1589 {
1590 struct ip_sf_list *psf, *nextpsf;
1591
1592 for (psf=pmc->tomb; psf; psf=nextpsf) {
1593 nextpsf = psf->sf_next;
1594 kfree(psf);
1595 }
1596 pmc->tomb = 0;
1597 for (psf=pmc->sources; psf; psf=nextpsf) {
1598 nextpsf = psf->sf_next;
1599 kfree(psf);
1600 }
1601 pmc->sources = 0;
1602 pmc->sfmode = MCAST_EXCLUDE;
1603 pmc->sfcount[MCAST_EXCLUDE] = 0;
1604 pmc->sfcount[MCAST_EXCLUDE] = 1;
1605 }
1606
1607
1608 /*
1609 * Join a multicast group
1610 */
1611 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1612 {
1613 int err;
1614 u32 addr = imr->imr_multiaddr.s_addr;
1615 struct ip_mc_socklist *iml, *i;
1616 struct in_device *in_dev;
1617 struct inet_opt *inet = inet_sk(sk);
1618 int count = 0;
1619
1620 if (!MULTICAST(addr))
1621 return -EINVAL;
1622
1623 rtnl_shlock();
1624
1625 in_dev = ip_mc_find_dev(imr);
1626
1627 if (!in_dev) {
1628 iml = NULL;
1629 err = -ENODEV;
1630 goto done;
1631 }
1632
1633 iml = (struct ip_mc_socklist *)sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1634
1635 err = -EADDRINUSE;
1636 for (i = inet->mc_list; i; i = i->next) {
1637 if (memcmp(&i->multi, imr, sizeof(*imr)) == 0) {
1638 /* New style additions are reference counted */
1639 if (imr->imr_address.s_addr == 0) {
1640 i->count++;
1641 err = 0;
1642 }
1643 goto done;
1644 }
1645 count++;
1646 }
1647 err = -ENOBUFS;
1648 if (iml == NULL || count >= sysctl_igmp_max_memberships)
1649 goto done;
1650 memcpy(&iml->multi, imr, sizeof(*imr));
1651 iml->next = inet->mc_list;
1652 iml->count = 1;
1653 iml->sflist = NULL;
1654 iml->sfmode = MCAST_EXCLUDE;
1655 inet->mc_list = iml;
1656 ip_mc_inc_group(in_dev, addr);
1657 iml = NULL;
1658 err = 0;
1659
1660 done:
1661 rtnl_shunlock();
1662 if (iml)
1663 sock_kfree_s(sk, iml, sizeof(*iml));
1664 return err;
1665 }
1666
1667 int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1668 struct in_device *in_dev)
1669 {
1670 int err;
1671
1672 if (iml->sflist == 0) {
1673 /* any-source empty exclude case */
1674 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1675 iml->sfmode, 0, 0, 0);
1676 }
1677 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1678 iml->sfmode, iml->sflist->sl_count,
1679 iml->sflist->sl_addr, 0);
1680 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1681 iml->sflist = 0;
1682 return err;
1683 }
1684
1685 /*
1686 * Ask a socket to leave a group.
1687 */
1688
1689 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1690 {
1691 struct inet_opt *inet = inet_sk(sk);
1692 struct ip_mc_socklist *iml, **imlp;
1693
1694 rtnl_lock();
1695 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1696 if (iml->multi.imr_multiaddr.s_addr==imr->imr_multiaddr.s_addr &&
1697 iml->multi.imr_address.s_addr==imr->imr_address.s_addr &&
1698 (!imr->imr_ifindex || iml->multi.imr_ifindex==imr->imr_ifindex)) {
1699 struct in_device *in_dev;
1700
1701 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
1702 if (in_dev)
1703 (void) ip_mc_leave_src(sk, iml, in_dev);
1704 if (--iml->count) {
1705 rtnl_unlock();
1706 if (in_dev)
1707 in_dev_put(in_dev);
1708 return 0;
1709 }
1710
1711 *imlp = iml->next;
1712
1713 if (in_dev) {
1714 ip_mc_dec_group(in_dev, imr->imr_multiaddr.s_addr);
1715 in_dev_put(in_dev);
1716 }
1717 rtnl_unlock();
1718 sock_kfree_s(sk, iml, sizeof(*iml));
1719 return 0;
1720 }
1721 }
1722 rtnl_unlock();
1723 return -EADDRNOTAVAIL;
1724 }
1725
1726 int ip_mc_source(int add, int omode, struct sock *sk, struct
1727 ip_mreq_source *mreqs, int ifindex)
1728 {
1729 int err;
1730 struct ip_mreqn imr;
1731 u32 addr = mreqs->imr_multiaddr;
1732 struct ip_mc_socklist *pmc;
1733 struct in_device *in_dev = 0;
1734 struct inet_opt *inet = inet_sk(sk);
1735 struct ip_sf_socklist *psl;
1736 int i, j, rv;
1737
1738 if (!MULTICAST(addr))
1739 return -EINVAL;
1740
1741 rtnl_shlock();
1742
1743 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1744 imr.imr_address.s_addr = mreqs->imr_interface;
1745 imr.imr_ifindex = ifindex;
1746 in_dev = ip_mc_find_dev(&imr);
1747
1748 if (!in_dev) {
1749 err = -ENODEV;
1750 goto done;
1751 }
1752 err = -EADDRNOTAVAIL;
1753
1754 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1755 if (memcmp(&pmc->multi, mreqs, 2*sizeof(__u32)) == 0)
1756 break;
1757 }
1758 if (!pmc) /* must have a prior join */
1759 goto done;
1760 /* if a source filter was set, must be the same mode as before */
1761 if (pmc->sflist) {
1762 if (pmc->sfmode != omode)
1763 goto done;
1764 } else if (pmc->sfmode != omode) {
1765 /* allow mode switches for empty-set filters */
1766 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, 0, 0);
1767 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1768 0, 0);
1769 pmc->sfmode = omode;
1770 }
1771
1772 psl = pmc->sflist;
1773 if (!add) {
1774 if (!psl)
1775 goto done;
1776 rv = !0;
1777 for (i=0; i<psl->sl_count; i++) {
1778 rv = memcmp(&psl->sl_addr, &mreqs->imr_multiaddr,
1779 sizeof(__u32));
1780 if (rv >= 0)
1781 break;
1782 }
1783 if (!rv) /* source not found */
1784 goto done;
1785
1786 /* update the interface filter */
1787 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1788 &mreqs->imr_sourceaddr, 1);
1789
1790 for (j=i+1; j<psl->sl_count; j++)
1791 psl->sl_addr[j-1] = psl->sl_addr[j];
1792 psl->sl_count--;
1793 err = 0;
1794 goto done;
1795 }
1796 /* else, add a new source to the filter */
1797
1798 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1799 err = -ENOBUFS;
1800 goto done;
1801 }
1802 if (!psl || psl->sl_count == psl->sl_max) {
1803 struct ip_sf_socklist *newpsl;
1804 int count = IP_SFBLOCK;
1805
1806 if (psl)
1807 count += psl->sl_max;
1808 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk,
1809 IP_SFLSIZE(count), GFP_KERNEL);
1810 if (!newpsl) {
1811 err = -ENOBUFS;
1812 goto done;
1813 }
1814 newpsl->sl_max = count;
1815 newpsl->sl_count = count - IP_SFBLOCK;
1816 if (psl) {
1817 for (i=0; i<psl->sl_count; i++)
1818 newpsl->sl_addr[i] = psl->sl_addr[i];
1819 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1820 }
1821 pmc->sflist = psl = newpsl;
1822 }
1823 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1824 for (i=0; i<psl->sl_count; i++) {
1825 rv = memcmp(&psl->sl_addr, &mreqs->imr_multiaddr,
1826 sizeof(__u32));
1827 if (rv >= 0)
1828 break;
1829 }
1830 if (rv == 0) /* address already there is an error */
1831 goto done;
1832 for (j=psl->sl_count-1; j>=i; j--)
1833 psl->sl_addr[j+1] = psl->sl_addr[j];
1834 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1835 psl->sl_count++;
1836 err = 0;
1837 /* update the interface list */
1838 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1839 &mreqs->imr_sourceaddr, 1);
1840 done:
1841 rtnl_shunlock();
1842 return err;
1843 }
1844
1845 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1846 {
1847 int err;
1848 struct ip_mreqn imr;
1849 u32 addr = msf->imsf_multiaddr;
1850 struct ip_mc_socklist *pmc;
1851 struct in_device *in_dev;
1852 struct inet_opt *inet = inet_sk(sk);
1853 struct ip_sf_socklist *newpsl, *psl;
1854
1855 if (!MULTICAST(addr))
1856 return -EINVAL;
1857 if (msf->imsf_fmode != MCAST_INCLUDE &&
1858 msf->imsf_fmode != MCAST_EXCLUDE)
1859 return -EINVAL;
1860
1861 rtnl_shlock();
1862
1863 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1864 imr.imr_address.s_addr = msf->imsf_interface;
1865 imr.imr_ifindex = ifindex;
1866 in_dev = ip_mc_find_dev(&imr);
1867
1868 if (!in_dev) {
1869 err = -ENODEV;
1870 goto done;
1871 }
1872 err = -EADDRNOTAVAIL;
1873
1874 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1875 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1876 pmc->multi.imr_ifindex == imr.imr_ifindex)
1877 break;
1878 }
1879 if (!pmc) /* must have a prior join */
1880 goto done;
1881 if (msf->imsf_numsrc) {
1882 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk,
1883 IP_SFLSIZE(msf->imsf_numsrc), GFP_KERNEL);
1884 if (!newpsl) {
1885 err = -ENOBUFS;
1886 goto done;
1887 }
1888 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
1889 memcpy(newpsl->sl_addr, msf->imsf_slist,
1890 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
1891 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1892 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
1893 if (err) {
1894 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
1895 goto done;
1896 }
1897 } else
1898 newpsl = 0;
1899 psl = pmc->sflist;
1900 if (psl) {
1901 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1902 psl->sl_count, psl->sl_addr, 0);
1903 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1904 } else
1905 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1906 0, 0, 0);
1907 pmc->sflist = newpsl;
1908 pmc->sfmode = msf->imsf_fmode;
1909 done:
1910 rtnl_shunlock();
1911 return err;
1912 }
1913
1914 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
1915 struct ip_msfilter *optval, int *optlen)
1916 {
1917 int err, len, count, copycount;
1918 struct ip_mreqn imr;
1919 u32 addr = msf->imsf_multiaddr;
1920 struct ip_mc_socklist *pmc;
1921 struct in_device *in_dev;
1922 struct inet_opt *inet = inet_sk(sk);
1923 struct ip_sf_socklist *psl;
1924
1925 if (!MULTICAST(addr))
1926 return -EINVAL;
1927
1928 rtnl_shlock();
1929
1930 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1931 imr.imr_address.s_addr = msf->imsf_interface;
1932 imr.imr_ifindex = 0;
1933 in_dev = ip_mc_find_dev(&imr);
1934
1935 if (!in_dev) {
1936 err = -ENODEV;
1937 goto done;
1938 }
1939 err = -EADDRNOTAVAIL;
1940
1941 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1942 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1943 pmc->multi.imr_ifindex == imr.imr_ifindex)
1944 break;
1945 }
1946 if (!pmc) /* must have a prior join */
1947 goto done;
1948 msf->imsf_fmode = pmc->sfmode;
1949 psl = pmc->sflist;
1950 rtnl_shunlock();
1951 if (!psl) {
1952 len = 0;
1953 count = 0;
1954 } else {
1955 count = psl->sl_count;
1956 }
1957 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
1958 len = copycount * sizeof(psl->sl_addr[0]);
1959 msf->imsf_numsrc = count;
1960 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
1961 copy_to_user((void *)optval, msf, IP_MSFILTER_SIZE(0))) {
1962 return -EFAULT;
1963 }
1964 if (len &&
1965 copy_to_user((void *)&optval->imsf_slist[0], psl->sl_addr, len))
1966 return -EFAULT;
1967 return 0;
1968 done:
1969 rtnl_shunlock();
1970 return err;
1971 }
1972
1973 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
1974 struct group_filter *optval, int *optlen)
1975 {
1976 int err, i, count, copycount;
1977 struct sockaddr_in *psin;
1978 u32 addr;
1979 struct ip_mc_socklist *pmc;
1980 struct inet_opt *inet = inet_sk(sk);
1981 struct ip_sf_socklist *psl;
1982
1983 psin = (struct sockaddr_in *)&gsf->gf_group;
1984 if (psin->sin_family != AF_INET)
1985 return -EINVAL;
1986 addr = psin->sin_addr.s_addr;
1987 if (!MULTICAST(addr))
1988 return -EINVAL;
1989
1990 rtnl_shlock();
1991
1992 err = -EADDRNOTAVAIL;
1993
1994 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1995 if (pmc->multi.imr_multiaddr.s_addr == addr &&
1996 pmc->multi.imr_ifindex == gsf->gf_interface)
1997 break;
1998 }
1999 if (!pmc) /* must have a prior join */
2000 goto done;
2001 gsf->gf_fmode = pmc->sfmode;
2002 psl = pmc->sflist;
2003 rtnl_shunlock();
2004 count = psl ? psl->sl_count : 0;
2005 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2006 gsf->gf_numsrc = count;
2007 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2008 copy_to_user((void *)optval, gsf, GROUP_FILTER_SIZE(0))) {
2009 return -EFAULT;
2010 }
2011 for (i=0; i<copycount; i++) {
2012 struct sockaddr_in *psin;
2013 struct sockaddr_storage ss;
2014
2015 psin = (struct sockaddr_in *)&ss;
2016 memset(&ss, 0, sizeof(ss));
2017 psin->sin_family = AF_INET;
2018 psin->sin_addr.s_addr = psl->sl_addr[i];
2019 if (copy_to_user((void *)&optval->gf_slist[i], &ss, sizeof(ss)))
2020 return -EFAULT;
2021 }
2022 return 0;
2023 done:
2024 rtnl_shunlock();
2025 return err;
2026 }
2027
2028 /*
2029 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2030 */
2031 int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
2032 {
2033 struct inet_opt *inet = inet_sk(sk);
2034 struct ip_mc_socklist *pmc;
2035 struct ip_sf_socklist *psl;
2036 int i;
2037
2038 if (!MULTICAST(loc_addr))
2039 return 1;
2040
2041 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2042 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2043 pmc->multi.imr_ifindex == dif)
2044 break;
2045 }
2046 if (!pmc)
2047 return 1;
2048 psl = pmc->sflist;
2049 if (!psl)
2050 return pmc->sfmode == MCAST_EXCLUDE;
2051
2052 for (i=0; i<psl->sl_count; i++) {
2053 if (psl->sl_addr[i] == rmt_addr)
2054 break;
2055 }
2056 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2057 return 0;
2058 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2059 return 0;
2060 return 1;
2061 }
2062
2063 /*
2064 * A socket is closing.
2065 */
2066
2067 void ip_mc_drop_socket(struct sock *sk)
2068 {
2069 struct inet_opt *inet = inet_sk(sk);
2070 struct ip_mc_socklist *iml;
2071
2072 if (inet->mc_list == NULL)
2073 return;
2074
2075 rtnl_lock();
2076 while ((iml = inet->mc_list) != NULL) {
2077 struct in_device *in_dev;
2078 inet->mc_list = iml->next;
2079
2080 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) {
2081 (void) ip_mc_leave_src(sk, iml, in_dev);
2082 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2083 in_dev_put(in_dev);
2084 }
2085 sock_kfree_s(sk, iml, sizeof(*iml));
2086
2087 }
2088 rtnl_unlock();
2089 }
2090
2091 int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto)
2092 {
2093 struct ip_mc_list *im;
2094 struct ip_sf_list *psf;
2095 int rv = 0;
2096
2097 read_lock(&in_dev->lock);
2098 for (im=in_dev->mc_list; im; im=im->next) {
2099 if (im->multiaddr == mc_addr)
2100 break;
2101 }
2102 if (im && proto == IPPROTO_IGMP) {
2103 rv = 1;
2104 } else if (im) {
2105 if (src_addr) {
2106 for (psf=im->sources; psf; psf=psf->sf_next) {
2107 if (psf->sf_inaddr == src_addr)
2108 break;
2109 }
2110 if (psf)
2111 rv = psf->sf_count[MCAST_INCLUDE] ||
2112 psf->sf_count[MCAST_EXCLUDE] !=
2113 im->sfcount[MCAST_EXCLUDE];
2114 else
2115 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2116 } else
2117 rv = 1; /* unspecified source; tentatively allow */
2118 }
2119 read_unlock(&in_dev->lock);
2120 return rv;
2121 }
2122
2123 #if defined(CONFIG_PROC_FS)
2124 struct igmp_mc_iter_state {
2125 struct net_device *dev;
2126 struct in_device *in_dev;
2127 };
2128
2129 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2130
2131 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2132 {
2133 struct ip_mc_list *im = NULL;
2134 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2135
2136 for (state->dev = dev_base, state->in_dev = NULL;
2137 state->dev;
2138 state->dev = state->dev->next) {
2139 struct in_device *in_dev;
2140 in_dev = in_dev_get(state->dev);
2141 if (!in_dev)
2142 continue;
2143 read_lock(&in_dev->lock);
2144 im = in_dev->mc_list;
2145 if (im) {
2146 state->in_dev = in_dev;
2147 break;
2148 }
2149 read_unlock(&in_dev->lock);
2150 in_dev_put(in_dev);
2151 }
2152 return im;
2153 }
2154
2155 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2156 {
2157 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2158 im = im->next;
2159 while (!im) {
2160 if (likely(state->in_dev != NULL)) {
2161 read_unlock(&state->in_dev->lock);
2162 in_dev_put(state->in_dev);
2163 }
2164 state->dev = state->dev->next;
2165 if (!state->dev) {
2166 state->in_dev = NULL;
2167 break;
2168 }
2169 state->in_dev = in_dev_get(state->dev);
2170 if (!state->in_dev)
2171 continue;
2172 read_lock(&state->in_dev->lock);
2173 im = state->in_dev->mc_list;
2174 }
2175 return im;
2176 }
2177
2178 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2179 {
2180 struct ip_mc_list *im = igmp_mc_get_first(seq);
2181 if (im)
2182 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2183 --pos;
2184 return pos ? NULL : im;
2185 }
2186
2187 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2188 {
2189 read_lock(&dev_base_lock);
2190 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2191 }
2192
2193 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2194 {
2195 struct ip_mc_list *im;
2196 if (v == SEQ_START_TOKEN)
2197 im = igmp_mc_get_first(seq);
2198 else
2199 im = igmp_mc_get_next(seq, v);
2200 ++*pos;
2201 return im;
2202 }
2203
2204 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2205 {
2206 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2207 if (likely(state->in_dev != NULL)) {
2208 read_unlock(&state->in_dev->lock);
2209 in_dev_put(state->in_dev);
2210 state->in_dev = NULL;
2211 }
2212 state->dev = NULL;
2213 read_unlock(&dev_base_lock);
2214 }
2215
2216 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2217 {
2218 if (v == SEQ_START_TOKEN)
2219 seq_printf(seq,
2220 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2221 else {
2222 struct ip_mc_list *im = (struct ip_mc_list *)v;
2223 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2224 char *querier;
2225 #ifdef CONFIG_IP_MULTICAST
2226 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : "V2";
2227 #else
2228 querier = "NONE";
2229 #endif
2230
2231 if (state->in_dev->mc_list == im) {
2232 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2233 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2234 }
2235
2236 seq_printf(seq,
2237 "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n",
2238 im->multiaddr, im->users,
2239 im->tm_running, jiffies_to_clock_t(im->timer.expires-jiffies), im->reporter);
2240 }
2241 return 0;
2242 }
2243
2244 static struct seq_operations igmp_mc_seq_ops = {
2245 .start = igmp_mc_seq_start,
2246 .next = igmp_mc_seq_next,
2247 .stop = igmp_mc_seq_stop,
2248 .show = igmp_mc_seq_show,
2249 };
2250
2251 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2252 {
2253 struct seq_file *seq;
2254 int rc = -ENOMEM;
2255 struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2256
2257 if (!s)
2258 goto out;
2259 rc = seq_open(file, &igmp_mc_seq_ops);
2260 if (rc)
2261 goto out_kfree;
2262
2263 seq = file->private_data;
2264 seq->private = s;
2265 memset(s, 0, sizeof(*s));
2266 out:
2267 return rc;
2268 out_kfree:
2269 kfree(s);
2270 goto out;
2271 }
2272
2273 static struct file_operations igmp_mc_seq_fops = {
2274 .owner = THIS_MODULE,
2275 .open = igmp_mc_seq_open,
2276 .read = seq_read,
2277 .llseek = seq_lseek,
2278 .release = seq_release_private,
2279 };
2280
2281 struct igmp_mcf_iter_state {
2282 struct net_device *dev;
2283 struct in_device *idev;
2284 struct ip_mc_list *im;
2285 };
2286
2287 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2288
2289 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2290 {
2291 struct ip_sf_list *psf = NULL;
2292 struct ip_mc_list *im = NULL;
2293 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2294
2295 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2296 state->dev;
2297 state->dev = state->dev->next) {
2298 struct in_device *idev;
2299 idev = in_dev_get(state->dev);
2300 if (unlikely(idev == NULL))
2301 continue;
2302 read_lock_bh(&idev->lock);
2303 im = idev->mc_list;
2304 if (likely(im != NULL)) {
2305 spin_lock_bh(&im->lock);
2306 psf = im->sources;
2307 if (likely(psf != NULL)) {
2308 state->im = im;
2309 state->idev = idev;
2310 break;
2311 }
2312 spin_unlock_bh(&im->lock);
2313 }
2314 read_unlock_bh(&idev->lock);
2315 in_dev_put(idev);
2316 }
2317 return psf;
2318 }
2319
2320 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2321 {
2322 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2323
2324 psf = psf->sf_next;
2325 while (!psf) {
2326 spin_unlock_bh(&state->im->lock);
2327 state->im = state->im->next;
2328 while (!state->im) {
2329 if (likely(state->idev != NULL)) {
2330 read_unlock_bh(&state->idev->lock);
2331 in_dev_put(state->idev);
2332 }
2333 state->dev = state->dev->next;
2334 if (!state->dev) {
2335 state->idev = NULL;
2336 goto out;
2337 }
2338 state->idev = in_dev_get(state->dev);
2339 if (!state->idev)
2340 continue;
2341 read_lock_bh(&state->idev->lock);
2342 state->im = state->idev->mc_list;
2343 }
2344 if (!state->im)
2345 break;
2346 spin_lock_bh(&state->im->lock);
2347 psf = state->im->sources;
2348 }
2349 out:
2350 return psf;
2351 }
2352
2353 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2354 {
2355 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2356 if (psf)
2357 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2358 --pos;
2359 return pos ? NULL : psf;
2360 }
2361
2362 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2363 {
2364 read_lock(&dev_base_lock);
2365 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2366 }
2367
2368 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2369 {
2370 struct ip_sf_list *psf;
2371 if (v == SEQ_START_TOKEN)
2372 psf = igmp_mcf_get_first(seq);
2373 else
2374 psf = igmp_mcf_get_next(seq, v);
2375 ++*pos;
2376 return psf;
2377 }
2378
2379 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2380 {
2381 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2382 if (likely(state->im != NULL)) {
2383 spin_unlock_bh(&state->im->lock);
2384 state->im = NULL;
2385 }
2386 if (likely(state->idev != NULL)) {
2387 read_unlock_bh(&state->idev->lock);
2388 in_dev_put(state->idev);
2389 state->idev = NULL;
2390 }
2391 state->dev = NULL;
2392 read_unlock(&dev_base_lock);
2393 }
2394
2395 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2396 {
2397 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2398 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2399
2400 if (v == SEQ_START_TOKEN) {
2401 seq_printf(seq,
2402 "%3s %6s "
2403 "%10s %10s %6s %6s\n", "Idx",
2404 "Device", "MCA",
2405 "SRC", "INC", "EXC");
2406 } else {
2407 seq_printf(seq,
2408 "%3d %6.6s 0x%08x "
2409 "0x%08x %6lu %6lu\n",
2410 state->dev->ifindex, state->dev->name,
2411 ntohl(state->im->multiaddr),
2412 ntohl(psf->sf_inaddr),
2413 psf->sf_count[MCAST_INCLUDE],
2414 psf->sf_count[MCAST_EXCLUDE]);
2415 }
2416 return 0;
2417 }
2418
2419 static struct seq_operations igmp_mcf_seq_ops = {
2420 .start = igmp_mcf_seq_start,
2421 .next = igmp_mcf_seq_next,
2422 .stop = igmp_mcf_seq_stop,
2423 .show = igmp_mcf_seq_show,
2424 };
2425
2426 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2427 {
2428 struct seq_file *seq;
2429 int rc = -ENOMEM;
2430 struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2431
2432 if (!s)
2433 goto out;
2434 rc = seq_open(file, &igmp_mcf_seq_ops);
2435 if (rc)
2436 goto out_kfree;
2437
2438 seq = file->private_data;
2439 seq->private = s;
2440 memset(s, 0, sizeof(*s));
2441 out:
2442 return rc;
2443 out_kfree:
2444 kfree(s);
2445 goto out;
2446 }
2447
2448 static struct file_operations igmp_mcf_seq_fops = {
2449 .owner = THIS_MODULE,
2450 .open = igmp_mcf_seq_open,
2451 .read = seq_read,
2452 .llseek = seq_lseek,
2453 .release = seq_release_private,
2454 };
2455
2456 int __init igmp_mc_proc_init(void)
2457 {
2458 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2459 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2460 return 0;
2461 }
2462 #endif
2463
2464 EXPORT_SYMBOL(ip_mc_dec_group);
2465 EXPORT_SYMBOL(ip_mc_inc_group);
2466 EXPORT_SYMBOL(ip_mc_join_group);
Historical 2.5/2.6 development