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[IPSEC]: Merge common code into xfrm_bundle_create
[linux-2.6.git] / net / ipv4 / igmp.c
blob701558564e96863d0d3b01ee679687aa72f1c8e9
1 /*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
11 * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
12 *
13 * Authors:
14 * Alan Cox <Alan.Cox@linux.org>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 *
21 * Fixes:
22 *
23 * Alan Cox : Added lots of __inline__ to optimise
24 * the memory usage of all the tiny little
25 * functions.
26 * Alan Cox : Dumped the header building experiment.
27 * Alan Cox : Minor tweaks ready for multicast routing
28 * and extended IGMP protocol.
29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
30 * writes utterly bogus code otherwise (sigh)
31 * fixed IGMP loopback to behave in the manner
32 * desired by mrouted, fixed the fact it has been
33 * broken since 1.3.6 and cleaned up a few minor
34 * points.
35 *
36 * Chih-Jen Chang : Tried to revise IGMP to Version 2
37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
38 * The enhancements are mainly based on Steve Deering's
39 * ipmulti-3.5 source code.
40 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
41 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
42 * the mrouted version on that device.
43 * Chih-Jen Chang : Added the max_resp_time parameter to
44 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
45 * to identify the multicast router version
46 * and do what the IGMP version 2 specified.
47 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
48 * Tsu-Sheng Tsao if the specified time expired.
49 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
50 * Alan Cox : Use GFP_ATOMIC in the right places.
51 * Christian Daudt : igmp timer wasn't set for local group
52 * memberships but was being deleted,
53 * which caused a "del_timer() called
54 * from %p with timer not initialized\n"
55 * message (960131).
56 * Christian Daudt : removed del_timer from
57 * igmp_timer_expire function (960205).
58 * Christian Daudt : igmp_heard_report now only calls
59 * igmp_timer_expire if tm->running is
60 * true (960216).
61 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
62 * igmp_heard_query never trigger. Expiry
63 * miscalculation fixed in igmp_heard_query
64 * and random() made to return unsigned to
65 * prevent negative expiry times.
66 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
67 * fix from pending 2.1.x patches.
68 * Alan Cox: Forget to enable FDDI support earlier.
69 * Alexey Kuznetsov: Fixed leaving groups on device down.
70 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
71 * David L Stevens: IGMPv3 support, with help from
72 * Vinay Kulkarni
73 */
74
75 #include <linux/module.h>
76 #include <asm/uaccess.h>
77 #include <asm/system.h>
78 #include <linux/types.h>
79 #include <linux/kernel.h>
80 #include <linux/jiffies.h>
81 #include <linux/string.h>
82 #include <linux/socket.h>
83 #include <linux/sockios.h>
84 #include <linux/in.h>
85 #include <linux/inet.h>
86 #include <linux/netdevice.h>
87 #include <linux/skbuff.h>
88 #include <linux/inetdevice.h>
89 #include <linux/igmp.h>
90 #include <linux/if_arp.h>
91 #include <linux/rtnetlink.h>
92 #include <linux/times.h>
93
94 #include <net/net_namespace.h>
95 #include <net/arp.h>
96 #include <net/ip.h>
97 #include <net/protocol.h>
98 #include <net/route.h>
99 #include <net/sock.h>
100 #include <net/checksum.h>
101 #include <linux/netfilter_ipv4.h>
102 #ifdef CONFIG_IP_MROUTE
103 #include <linux/mroute.h>
104 #endif
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
108 #endif
109
110 #define IP_MAX_MEMBERSHIPS 20
111 #define IP_MAX_MSF 10
112
113 #ifdef CONFIG_IP_MULTICAST
114 /* Parameter names and values are taken from igmp-v2-06 draft */
115
116 #define IGMP_V1_Router_Present_Timeout (400*HZ)
117 #define IGMP_V2_Router_Present_Timeout (400*HZ)
118 #define IGMP_Unsolicited_Report_Interval (10*HZ)
119 #define IGMP_Query_Response_Interval (10*HZ)
120 #define IGMP_Unsolicited_Report_Count 2
121
122
123 #define IGMP_Initial_Report_Delay (1)
124
125 /* IGMP_Initial_Report_Delay is not from IGMP specs!
126 * IGMP specs require to report membership immediately after
127 * joining a group, but we delay the first report by a
128 * small interval. It seems more natural and still does not
129 * contradict to specs provided this delay is small enough.
130 */
131
132 #define IGMP_V1_SEEN(in_dev) \
133 (IPV4_DEVCONF_ALL(FORCE_IGMP_VERSION) == 1 || \
134 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
135 ((in_dev)->mr_v1_seen && \
136 time_before(jiffies, (in_dev)->mr_v1_seen)))
137 #define IGMP_V2_SEEN(in_dev) \
138 (IPV4_DEVCONF_ALL(FORCE_IGMP_VERSION) == 2 || \
139 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
140 ((in_dev)->mr_v2_seen && \
141 time_before(jiffies, (in_dev)->mr_v2_seen)))
142
143 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
144 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
145 static void igmpv3_clear_delrec(struct in_device *in_dev);
146 static int sf_setstate(struct ip_mc_list *pmc);
147 static void sf_markstate(struct ip_mc_list *pmc);
148 #endif
149 static void ip_mc_clear_src(struct ip_mc_list *pmc);
150 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
151 int sfcount, __be32 *psfsrc, int delta);
152
153 static void ip_ma_put(struct ip_mc_list *im)
154 {
155 if (atomic_dec_and_test(&im->refcnt)) {
156 in_dev_put(im->interface);
157 kfree(im);
158 }
159 }
160
161 #ifdef CONFIG_IP_MULTICAST
162
163 /*
164 * Timer management
165 */
166
167 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
168 {
169 spin_lock_bh(&im->lock);
170 if (del_timer(&im->timer))
171 atomic_dec(&im->refcnt);
172 im->tm_running=0;
173 im->reporter = 0;
174 im->unsolicit_count = 0;
175 spin_unlock_bh(&im->lock);
176 }
177
178 /* It must be called with locked im->lock */
179 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
180 {
181 int tv=net_random() % max_delay;
182
183 im->tm_running=1;
184 if (!mod_timer(&im->timer, jiffies+tv+2))
185 atomic_inc(&im->refcnt);
186 }
187
188 static void igmp_gq_start_timer(struct in_device *in_dev)
189 {
190 int tv = net_random() % in_dev->mr_maxdelay;
191
192 in_dev->mr_gq_running = 1;
193 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
194 in_dev_hold(in_dev);
195 }
196
197 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
198 {
199 int tv = net_random() % delay;
200
201 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
202 in_dev_hold(in_dev);
203 }
204
205 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
206 {
207 spin_lock_bh(&im->lock);
208 im->unsolicit_count = 0;
209 if (del_timer(&im->timer)) {
210 if ((long)(im->timer.expires-jiffies) < max_delay) {
211 add_timer(&im->timer);
212 im->tm_running=1;
213 spin_unlock_bh(&im->lock);
214 return;
215 }
216 atomic_dec(&im->refcnt);
217 }
218 igmp_start_timer(im, max_delay);
219 spin_unlock_bh(&im->lock);
220 }
221
222
223 /*
224 * Send an IGMP report.
225 */
226
227 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
228
229
230 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
231 int gdeleted, int sdeleted)
232 {
233 switch (type) {
234 case IGMPV3_MODE_IS_INCLUDE:
235 case IGMPV3_MODE_IS_EXCLUDE:
236 if (gdeleted || sdeleted)
237 return 0;
238 if (!(pmc->gsquery && !psf->sf_gsresp)) {
239 if (pmc->sfmode == MCAST_INCLUDE)
240 return 1;
241 /* don't include if this source is excluded
242 * in all filters
243 */
244 if (psf->sf_count[MCAST_INCLUDE])
245 return type == IGMPV3_MODE_IS_INCLUDE;
246 return pmc->sfcount[MCAST_EXCLUDE] ==
247 psf->sf_count[MCAST_EXCLUDE];
248 }
249 return 0;
250 case IGMPV3_CHANGE_TO_INCLUDE:
251 if (gdeleted || sdeleted)
252 return 0;
253 return psf->sf_count[MCAST_INCLUDE] != 0;
254 case IGMPV3_CHANGE_TO_EXCLUDE:
255 if (gdeleted || sdeleted)
256 return 0;
257 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
258 psf->sf_count[MCAST_INCLUDE])
259 return 0;
260 return pmc->sfcount[MCAST_EXCLUDE] ==
261 psf->sf_count[MCAST_EXCLUDE];
262 case IGMPV3_ALLOW_NEW_SOURCES:
263 if (gdeleted || !psf->sf_crcount)
264 return 0;
265 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
266 case IGMPV3_BLOCK_OLD_SOURCES:
267 if (pmc->sfmode == MCAST_INCLUDE)
268 return gdeleted || (psf->sf_crcount && sdeleted);
269 return psf->sf_crcount && !gdeleted && !sdeleted;
270 }
271 return 0;
272 }
273
274 static int
275 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
276 {
277 struct ip_sf_list *psf;
278 int scount = 0;
279
280 for (psf=pmc->sources; psf; psf=psf->sf_next) {
281 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
282 continue;
283 scount++;
284 }
285 return scount;
286 }
287
288 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
289 {
290 struct sk_buff *skb;
291 struct rtable *rt;
292 struct iphdr *pip;
293 struct igmpv3_report *pig;
294
295 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
296 if (skb == NULL)
297 return NULL;
298
299 {
300 struct flowi fl = { .oif = dev->ifindex,
301 .nl_u = { .ip4_u = {
302 .daddr = IGMPV3_ALL_MCR } },
303 .proto = IPPROTO_IGMP };
304 if (ip_route_output_key(&rt, &fl)) {
305 kfree_skb(skb);
306 return NULL;
307 }
308 }
309 if (rt->rt_src == 0) {
310 kfree_skb(skb);
311 ip_rt_put(rt);
312 return NULL;
313 }
314
315 skb->dst = &rt->u.dst;
316 skb->dev = dev;
317
318 skb_reserve(skb, LL_RESERVED_SPACE(dev));
319
320 skb_reset_network_header(skb);
321 pip = ip_hdr(skb);
322 skb_put(skb, sizeof(struct iphdr) + 4);
323
324 pip->version = 4;
325 pip->ihl = (sizeof(struct iphdr)+4)>>2;
326 pip->tos = 0xc0;
327 pip->frag_off = htons(IP_DF);
328 pip->ttl = 1;
329 pip->daddr = rt->rt_dst;
330 pip->saddr = rt->rt_src;
331 pip->protocol = IPPROTO_IGMP;
332 pip->tot_len = 0; /* filled in later */
333 ip_select_ident(pip, &rt->u.dst, NULL);
334 ((u8*)&pip[1])[0] = IPOPT_RA;
335 ((u8*)&pip[1])[1] = 4;
336 ((u8*)&pip[1])[2] = 0;
337 ((u8*)&pip[1])[3] = 0;
338
339 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
340 skb_put(skb, sizeof(*pig));
341 pig = igmpv3_report_hdr(skb);
342 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
343 pig->resv1 = 0;
344 pig->csum = 0;
345 pig->resv2 = 0;
346 pig->ngrec = 0;
347 return skb;
348 }
349
350 static int igmpv3_sendpack(struct sk_buff *skb)
351 {
352 struct iphdr *pip = ip_hdr(skb);
353 struct igmphdr *pig = igmp_hdr(skb);
354 const int iplen = skb->tail - skb->network_header;
355 const int igmplen = skb->tail - skb->transport_header;
356
357 pip->tot_len = htons(iplen);
358 ip_send_check(pip);
359 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
360
361 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
362 dst_output);
363 }
364
365 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
366 {
367 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
368 }
369
370 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
371 int type, struct igmpv3_grec **ppgr)
372 {
373 struct net_device *dev = pmc->interface->dev;
374 struct igmpv3_report *pih;
375 struct igmpv3_grec *pgr;
376
377 if (!skb)
378 skb = igmpv3_newpack(dev, dev->mtu);
379 if (!skb)
380 return NULL;
381 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
382 pgr->grec_type = type;
383 pgr->grec_auxwords = 0;
384 pgr->grec_nsrcs = 0;
385 pgr->grec_mca = pmc->multiaddr;
386 pih = igmpv3_report_hdr(skb);
387 pih->ngrec = htons(ntohs(pih->ngrec)+1);
388 *ppgr = pgr;
389 return skb;
390 }
391
392 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
393 skb_tailroom(skb)) : 0)
394
395 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
396 int type, int gdeleted, int sdeleted)
397 {
398 struct net_device *dev = pmc->interface->dev;
399 struct igmpv3_report *pih;
400 struct igmpv3_grec *pgr = NULL;
401 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
402 int scount, stotal, first, isquery, truncate;
403
404 if (pmc->multiaddr == IGMP_ALL_HOSTS)
405 return skb;
406
407 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
408 type == IGMPV3_MODE_IS_EXCLUDE;
409 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
410 type == IGMPV3_CHANGE_TO_EXCLUDE;
411
412 stotal = scount = 0;
413
414 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
415
416 if (!*psf_list)
417 goto empty_source;
418
419 pih = skb ? igmpv3_report_hdr(skb) : NULL;
420
421 /* EX and TO_EX get a fresh packet, if needed */
422 if (truncate) {
423 if (pih && pih->ngrec &&
424 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
425 if (skb)
426 igmpv3_sendpack(skb);
427 skb = igmpv3_newpack(dev, dev->mtu);
428 }
429 }
430 first = 1;
431 psf_prev = NULL;
432 for (psf=*psf_list; psf; psf=psf_next) {
433 __be32 *psrc;
434
435 psf_next = psf->sf_next;
436
437 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
438 psf_prev = psf;
439 continue;
440 }
441
442 /* clear marks on query responses */
443 if (isquery)
444 psf->sf_gsresp = 0;
445
446 if (AVAILABLE(skb) < sizeof(__be32) +
447 first*sizeof(struct igmpv3_grec)) {
448 if (truncate && !first)
449 break; /* truncate these */
450 if (pgr)
451 pgr->grec_nsrcs = htons(scount);
452 if (skb)
453 igmpv3_sendpack(skb);
454 skb = igmpv3_newpack(dev, dev->mtu);
455 first = 1;
456 scount = 0;
457 }
458 if (first) {
459 skb = add_grhead(skb, pmc, type, &pgr);
460 first = 0;
461 }
462 if (!skb)
463 return NULL;
464 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
465 *psrc = psf->sf_inaddr;
466 scount++; stotal++;
467 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
468 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
469 psf->sf_crcount--;
470 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
471 if (psf_prev)
472 psf_prev->sf_next = psf->sf_next;
473 else
474 *psf_list = psf->sf_next;
475 kfree(psf);
476 continue;
477 }
478 }
479 psf_prev = psf;
480 }
481
482 empty_source:
483 if (!stotal) {
484 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
485 type == IGMPV3_BLOCK_OLD_SOURCES)
486 return skb;
487 if (pmc->crcount || isquery) {
488 /* make sure we have room for group header */
489 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
490 igmpv3_sendpack(skb);
491 skb = NULL; /* add_grhead will get a new one */
492 }
493 skb = add_grhead(skb, pmc, type, &pgr);
494 }
495 }
496 if (pgr)
497 pgr->grec_nsrcs = htons(scount);
498
499 if (isquery)
500 pmc->gsquery = 0; /* clear query state on report */
501 return skb;
502 }
503
504 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
505 {
506 struct sk_buff *skb = NULL;
507 int type;
508
509 if (!pmc) {
510 read_lock(&in_dev->mc_list_lock);
511 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
512 if (pmc->multiaddr == IGMP_ALL_HOSTS)
513 continue;
514 spin_lock_bh(&pmc->lock);
515 if (pmc->sfcount[MCAST_EXCLUDE])
516 type = IGMPV3_MODE_IS_EXCLUDE;
517 else
518 type = IGMPV3_MODE_IS_INCLUDE;
519 skb = add_grec(skb, pmc, type, 0, 0);
520 spin_unlock_bh(&pmc->lock);
521 }
522 read_unlock(&in_dev->mc_list_lock);
523 } else {
524 spin_lock_bh(&pmc->lock);
525 if (pmc->sfcount[MCAST_EXCLUDE])
526 type = IGMPV3_MODE_IS_EXCLUDE;
527 else
528 type = IGMPV3_MODE_IS_INCLUDE;
529 skb = add_grec(skb, pmc, type, 0, 0);
530 spin_unlock_bh(&pmc->lock);
531 }
532 if (!skb)
533 return 0;
534 return igmpv3_sendpack(skb);
535 }
536
537 /*
538 * remove zero-count source records from a source filter list
539 */
540 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
541 {
542 struct ip_sf_list *psf_prev, *psf_next, *psf;
543
544 psf_prev = NULL;
545 for (psf=*ppsf; psf; psf = psf_next) {
546 psf_next = psf->sf_next;
547 if (psf->sf_crcount == 0) {
548 if (psf_prev)
549 psf_prev->sf_next = psf->sf_next;
550 else
551 *ppsf = psf->sf_next;
552 kfree(psf);
553 } else
554 psf_prev = psf;
555 }
556 }
557
558 static void igmpv3_send_cr(struct in_device *in_dev)
559 {
560 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
561 struct sk_buff *skb = NULL;
562 int type, dtype;
563
564 read_lock(&in_dev->mc_list_lock);
565 spin_lock_bh(&in_dev->mc_tomb_lock);
566
567 /* deleted MCA's */
568 pmc_prev = NULL;
569 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
570 pmc_next = pmc->next;
571 if (pmc->sfmode == MCAST_INCLUDE) {
572 type = IGMPV3_BLOCK_OLD_SOURCES;
573 dtype = IGMPV3_BLOCK_OLD_SOURCES;
574 skb = add_grec(skb, pmc, type, 1, 0);
575 skb = add_grec(skb, pmc, dtype, 1, 1);
576 }
577 if (pmc->crcount) {
578 if (pmc->sfmode == MCAST_EXCLUDE) {
579 type = IGMPV3_CHANGE_TO_INCLUDE;
580 skb = add_grec(skb, pmc, type, 1, 0);
581 }
582 pmc->crcount--;
583 if (pmc->crcount == 0) {
584 igmpv3_clear_zeros(&pmc->tomb);
585 igmpv3_clear_zeros(&pmc->sources);
586 }
587 }
588 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
589 if (pmc_prev)
590 pmc_prev->next = pmc_next;
591 else
592 in_dev->mc_tomb = pmc_next;
593 in_dev_put(pmc->interface);
594 kfree(pmc);
595 } else
596 pmc_prev = pmc;
597 }
598 spin_unlock_bh(&in_dev->mc_tomb_lock);
599
600 /* change recs */
601 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
602 spin_lock_bh(&pmc->lock);
603 if (pmc->sfcount[MCAST_EXCLUDE]) {
604 type = IGMPV3_BLOCK_OLD_SOURCES;
605 dtype = IGMPV3_ALLOW_NEW_SOURCES;
606 } else {
607 type = IGMPV3_ALLOW_NEW_SOURCES;
608 dtype = IGMPV3_BLOCK_OLD_SOURCES;
609 }
610 skb = add_grec(skb, pmc, type, 0, 0);
611 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
612
613 /* filter mode changes */
614 if (pmc->crcount) {
615 if (pmc->sfmode == MCAST_EXCLUDE)
616 type = IGMPV3_CHANGE_TO_EXCLUDE;
617 else
618 type = IGMPV3_CHANGE_TO_INCLUDE;
619 skb = add_grec(skb, pmc, type, 0, 0);
620 pmc->crcount--;
621 }
622 spin_unlock_bh(&pmc->lock);
623 }
624 read_unlock(&in_dev->mc_list_lock);
625
626 if (!skb)
627 return;
628 (void) igmpv3_sendpack(skb);
629 }
630
631 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
632 int type)
633 {
634 struct sk_buff *skb;
635 struct iphdr *iph;
636 struct igmphdr *ih;
637 struct rtable *rt;
638 struct net_device *dev = in_dev->dev;
639 __be32 group = pmc ? pmc->multiaddr : 0;
640 __be32 dst;
641
642 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
643 return igmpv3_send_report(in_dev, pmc);
644 else if (type == IGMP_HOST_LEAVE_MESSAGE)
645 dst = IGMP_ALL_ROUTER;
646 else
647 dst = group;
648
649 {
650 struct flowi fl = { .oif = dev->ifindex,
651 .nl_u = { .ip4_u = { .daddr = dst } },
652 .proto = IPPROTO_IGMP };
653 if (ip_route_output_key(&rt, &fl))
654 return -1;
655 }
656 if (rt->rt_src == 0) {
657 ip_rt_put(rt);
658 return -1;
659 }
660
661 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
662 if (skb == NULL) {
663 ip_rt_put(rt);
664 return -1;
665 }
666
667 skb->dst = &rt->u.dst;
668
669 skb_reserve(skb, LL_RESERVED_SPACE(dev));
670
671 skb_reset_network_header(skb);
672 iph = ip_hdr(skb);
673 skb_put(skb, sizeof(struct iphdr) + 4);
674
675 iph->version = 4;
676 iph->ihl = (sizeof(struct iphdr)+4)>>2;
677 iph->tos = 0xc0;
678 iph->frag_off = htons(IP_DF);
679 iph->ttl = 1;
680 iph->daddr = dst;
681 iph->saddr = rt->rt_src;
682 iph->protocol = IPPROTO_IGMP;
683 iph->tot_len = htons(IGMP_SIZE);
684 ip_select_ident(iph, &rt->u.dst, NULL);
685 ((u8*)&iph[1])[0] = IPOPT_RA;
686 ((u8*)&iph[1])[1] = 4;
687 ((u8*)&iph[1])[2] = 0;
688 ((u8*)&iph[1])[3] = 0;
689 ip_send_check(iph);
690
691 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
692 ih->type=type;
693 ih->code=0;
694 ih->csum=0;
695 ih->group=group;
696 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
697
698 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
699 dst_output);
700 }
701
702 static void igmp_gq_timer_expire(unsigned long data)
703 {
704 struct in_device *in_dev = (struct in_device *)data;
705
706 in_dev->mr_gq_running = 0;
707 igmpv3_send_report(in_dev, NULL);
708 __in_dev_put(in_dev);
709 }
710
711 static void igmp_ifc_timer_expire(unsigned long data)
712 {
713 struct in_device *in_dev = (struct in_device *)data;
714
715 igmpv3_send_cr(in_dev);
716 if (in_dev->mr_ifc_count) {
717 in_dev->mr_ifc_count--;
718 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
719 }
720 __in_dev_put(in_dev);
721 }
722
723 static void igmp_ifc_event(struct in_device *in_dev)
724 {
725 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
726 return;
727 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
728 IGMP_Unsolicited_Report_Count;
729 igmp_ifc_start_timer(in_dev, 1);
730 }
731
732
733 static void igmp_timer_expire(unsigned long data)
734 {
735 struct ip_mc_list *im=(struct ip_mc_list *)data;
736 struct in_device *in_dev = im->interface;
737
738 spin_lock(&im->lock);
739 im->tm_running=0;
740
741 if (im->unsolicit_count) {
742 im->unsolicit_count--;
743 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
744 }
745 im->reporter = 1;
746 spin_unlock(&im->lock);
747
748 if (IGMP_V1_SEEN(in_dev))
749 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
750 else if (IGMP_V2_SEEN(in_dev))
751 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
752 else
753 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
754
755 ip_ma_put(im);
756 }
757
758 /* mark EXCLUDE-mode sources */
759 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
760 {
761 struct ip_sf_list *psf;
762 int i, scount;
763
764 scount = 0;
765 for (psf=pmc->sources; psf; psf=psf->sf_next) {
766 if (scount == nsrcs)
767 break;
768 for (i=0; i<nsrcs; i++) {
769 /* skip inactive filters */
770 if (pmc->sfcount[MCAST_INCLUDE] ||
771 pmc->sfcount[MCAST_EXCLUDE] !=
772 psf->sf_count[MCAST_EXCLUDE])
773 continue;
774 if (srcs[i] == psf->sf_inaddr) {
775 scount++;
776 break;
777 }
778 }
779 }
780 pmc->gsquery = 0;
781 if (scount == nsrcs) /* all sources excluded */
782 return 0;
783 return 1;
784 }
785
786 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
787 {
788 struct ip_sf_list *psf;
789 int i, scount;
790
791 if (pmc->sfmode == MCAST_EXCLUDE)
792 return igmp_xmarksources(pmc, nsrcs, srcs);
793
794 /* mark INCLUDE-mode sources */
795 scount = 0;
796 for (psf=pmc->sources; psf; psf=psf->sf_next) {
797 if (scount == nsrcs)
798 break;
799 for (i=0; i<nsrcs; i++)
800 if (srcs[i] == psf->sf_inaddr) {
801 psf->sf_gsresp = 1;
802 scount++;
803 break;
804 }
805 }
806 if (!scount) {
807 pmc->gsquery = 0;
808 return 0;
809 }
810 pmc->gsquery = 1;
811 return 1;
812 }
813
814 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
815 {
816 struct ip_mc_list *im;
817
818 /* Timers are only set for non-local groups */
819
820 if (group == IGMP_ALL_HOSTS)
821 return;
822
823 read_lock(&in_dev->mc_list_lock);
824 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
825 if (im->multiaddr == group) {
826 igmp_stop_timer(im);
827 break;
828 }
829 }
830 read_unlock(&in_dev->mc_list_lock);
831 }
832
833 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
834 int len)
835 {
836 struct igmphdr *ih = igmp_hdr(skb);
837 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
838 struct ip_mc_list *im;
839 __be32 group = ih->group;
840 int max_delay;
841 int mark = 0;
842
843
844 if (len == 8) {
845 if (ih->code == 0) {
846 /* Alas, old v1 router presents here. */
847
848 max_delay = IGMP_Query_Response_Interval;
849 in_dev->mr_v1_seen = jiffies +
850 IGMP_V1_Router_Present_Timeout;
851 group = 0;
852 } else {
853 /* v2 router present */
854 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
855 in_dev->mr_v2_seen = jiffies +
856 IGMP_V2_Router_Present_Timeout;
857 }
858 /* cancel the interface change timer */
859 in_dev->mr_ifc_count = 0;
860 if (del_timer(&in_dev->mr_ifc_timer))
861 __in_dev_put(in_dev);
862 /* clear deleted report items */
863 igmpv3_clear_delrec(in_dev);
864 } else if (len < 12) {
865 return; /* ignore bogus packet; freed by caller */
866 } else { /* v3 */
867 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
868 return;
869
870 ih3 = igmpv3_query_hdr(skb);
871 if (ih3->nsrcs) {
872 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
873 + ntohs(ih3->nsrcs)*sizeof(__be32)))
874 return;
875 ih3 = igmpv3_query_hdr(skb);
876 }
877
878 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
879 if (!max_delay)
880 max_delay = 1; /* can't mod w/ 0 */
881 in_dev->mr_maxdelay = max_delay;
882 if (ih3->qrv)
883 in_dev->mr_qrv = ih3->qrv;
884 if (!group) { /* general query */
885 if (ih3->nsrcs)
886 return; /* no sources allowed */
887 igmp_gq_start_timer(in_dev);
888 return;
889 }
890 /* mark sources to include, if group & source-specific */
891 mark = ih3->nsrcs != 0;
892 }
893
894 /*
895 * - Start the timers in all of our membership records
896 * that the query applies to for the interface on
897 * which the query arrived excl. those that belong
898 * to a "local" group (224.0.0.X)
899 * - For timers already running check if they need to
900 * be reset.
901 * - Use the igmp->igmp_code field as the maximum
902 * delay possible
903 */
904 read_lock(&in_dev->mc_list_lock);
905 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
906 int changed;
907
908 if (group && group != im->multiaddr)
909 continue;
910 if (im->multiaddr == IGMP_ALL_HOSTS)
911 continue;
912 spin_lock_bh(&im->lock);
913 if (im->tm_running)
914 im->gsquery = im->gsquery && mark;
915 else
916 im->gsquery = mark;
917 changed = !im->gsquery ||
918 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
919 spin_unlock_bh(&im->lock);
920 if (changed)
921 igmp_mod_timer(im, max_delay);
922 }
923 read_unlock(&in_dev->mc_list_lock);
924 }
925
926 int igmp_rcv(struct sk_buff *skb)
927 {
928 /* This basically follows the spec line by line -- see RFC1112 */
929 struct igmphdr *ih;
930 struct in_device *in_dev = in_dev_get(skb->dev);
931 int len = skb->len;
932
933 if (in_dev==NULL) {
934 kfree_skb(skb);
935 return 0;
936 }
937
938 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
939 goto drop;
940
941 switch (skb->ip_summed) {
942 case CHECKSUM_COMPLETE:
943 if (!csum_fold(skb->csum))
944 break;
945 /* fall through */
946 case CHECKSUM_NONE:
947 skb->csum = 0;
948 if (__skb_checksum_complete(skb))
949 goto drop;
950 }
951
952 ih = igmp_hdr(skb);
953 switch (ih->type) {
954 case IGMP_HOST_MEMBERSHIP_QUERY:
955 igmp_heard_query(in_dev, skb, len);
956 break;
957 case IGMP_HOST_MEMBERSHIP_REPORT:
958 case IGMPV2_HOST_MEMBERSHIP_REPORT:
959 case IGMPV3_HOST_MEMBERSHIP_REPORT:
960 /* Is it our report looped back? */
961 if (((struct rtable*)skb->dst)->fl.iif == 0)
962 break;
963 /* don't rely on MC router hearing unicast reports */
964 if (skb->pkt_type == PACKET_MULTICAST ||
965 skb->pkt_type == PACKET_BROADCAST)
966 igmp_heard_report(in_dev, ih->group);
967 break;
968 case IGMP_PIM:
969 #ifdef CONFIG_IP_PIMSM_V1
970 in_dev_put(in_dev);
971 return pim_rcv_v1(skb);
972 #endif
973 case IGMP_DVMRP:
974 case IGMP_TRACE:
975 case IGMP_HOST_LEAVE_MESSAGE:
976 case IGMP_MTRACE:
977 case IGMP_MTRACE_RESP:
978 break;
979 default:
980 break;
981 }
982
983 drop:
984 in_dev_put(in_dev);
985 kfree_skb(skb);
986 return 0;
987 }
988
989 #endif
990
991
992 /*
993 * Add a filter to a device
994 */
995
996 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
997 {
998 char buf[MAX_ADDR_LEN];
999 struct net_device *dev = in_dev->dev;
1000
1001 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1002 We will get multicast token leakage, when IFF_MULTICAST
1003 is changed. This check should be done in dev->set_multicast_list
1004 routine. Something sort of:
1005 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1006 --ANK
1007 */
1008 if (arp_mc_map(addr, buf, dev, 0) == 0)
1009 dev_mc_add(dev,buf,dev->addr_len,0);
1010 }
1011
1012 /*
1013 * Remove a filter from a device
1014 */
1015
1016 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1017 {
1018 char buf[MAX_ADDR_LEN];
1019 struct net_device *dev = in_dev->dev;
1020
1021 if (arp_mc_map(addr, buf, dev, 0) == 0)
1022 dev_mc_delete(dev,buf,dev->addr_len,0);
1023 }
1024
1025 #ifdef CONFIG_IP_MULTICAST
1026 /*
1027 * deleted ip_mc_list manipulation
1028 */
1029 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1030 {
1031 struct ip_mc_list *pmc;
1032
1033 /* this is an "ip_mc_list" for convenience; only the fields below
1034 * are actually used. In particular, the refcnt and users are not
1035 * used for management of the delete list. Using the same structure
1036 * for deleted items allows change reports to use common code with
1037 * non-deleted or query-response MCA's.
1038 */
1039 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1040 if (!pmc)
1041 return;
1042 spin_lock_bh(&im->lock);
1043 pmc->interface = im->interface;
1044 in_dev_hold(in_dev);
1045 pmc->multiaddr = im->multiaddr;
1046 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1047 IGMP_Unsolicited_Report_Count;
1048 pmc->sfmode = im->sfmode;
1049 if (pmc->sfmode == MCAST_INCLUDE) {
1050 struct ip_sf_list *psf;
1051
1052 pmc->tomb = im->tomb;
1053 pmc->sources = im->sources;
1054 im->tomb = im->sources = NULL;
1055 for (psf=pmc->sources; psf; psf=psf->sf_next)
1056 psf->sf_crcount = pmc->crcount;
1057 }
1058 spin_unlock_bh(&im->lock);
1059
1060 spin_lock_bh(&in_dev->mc_tomb_lock);
1061 pmc->next = in_dev->mc_tomb;
1062 in_dev->mc_tomb = pmc;
1063 spin_unlock_bh(&in_dev->mc_tomb_lock);
1064 }
1065
1066 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1067 {
1068 struct ip_mc_list *pmc, *pmc_prev;
1069 struct ip_sf_list *psf, *psf_next;
1070
1071 spin_lock_bh(&in_dev->mc_tomb_lock);
1072 pmc_prev = NULL;
1073 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1074 if (pmc->multiaddr == multiaddr)
1075 break;
1076 pmc_prev = pmc;
1077 }
1078 if (pmc) {
1079 if (pmc_prev)
1080 pmc_prev->next = pmc->next;
1081 else
1082 in_dev->mc_tomb = pmc->next;
1083 }
1084 spin_unlock_bh(&in_dev->mc_tomb_lock);
1085 if (pmc) {
1086 for (psf=pmc->tomb; psf; psf=psf_next) {
1087 psf_next = psf->sf_next;
1088 kfree(psf);
1089 }
1090 in_dev_put(pmc->interface);
1091 kfree(pmc);
1092 }
1093 }
1094
1095 static void igmpv3_clear_delrec(struct in_device *in_dev)
1096 {
1097 struct ip_mc_list *pmc, *nextpmc;
1098
1099 spin_lock_bh(&in_dev->mc_tomb_lock);
1100 pmc = in_dev->mc_tomb;
1101 in_dev->mc_tomb = NULL;
1102 spin_unlock_bh(&in_dev->mc_tomb_lock);
1103
1104 for (; pmc; pmc = nextpmc) {
1105 nextpmc = pmc->next;
1106 ip_mc_clear_src(pmc);
1107 in_dev_put(pmc->interface);
1108 kfree(pmc);
1109 }
1110 /* clear dead sources, too */
1111 read_lock(&in_dev->mc_list_lock);
1112 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1113 struct ip_sf_list *psf, *psf_next;
1114
1115 spin_lock_bh(&pmc->lock);
1116 psf = pmc->tomb;
1117 pmc->tomb = NULL;
1118 spin_unlock_bh(&pmc->lock);
1119 for (; psf; psf=psf_next) {
1120 psf_next = psf->sf_next;
1121 kfree(psf);
1122 }
1123 }
1124 read_unlock(&in_dev->mc_list_lock);
1125 }
1126 #endif
1127
1128 static void igmp_group_dropped(struct ip_mc_list *im)
1129 {
1130 struct in_device *in_dev = im->interface;
1131 #ifdef CONFIG_IP_MULTICAST
1132 int reporter;
1133 #endif
1134
1135 if (im->loaded) {
1136 im->loaded = 0;
1137 ip_mc_filter_del(in_dev, im->multiaddr);
1138 }
1139
1140 #ifdef CONFIG_IP_MULTICAST
1141 if (im->multiaddr == IGMP_ALL_HOSTS)
1142 return;
1143
1144 reporter = im->reporter;
1145 igmp_stop_timer(im);
1146
1147 if (!in_dev->dead) {
1148 if (IGMP_V1_SEEN(in_dev))
1149 goto done;
1150 if (IGMP_V2_SEEN(in_dev)) {
1151 if (reporter)
1152 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1153 goto done;
1154 }
1155 /* IGMPv3 */
1156 igmpv3_add_delrec(in_dev, im);
1157
1158 igmp_ifc_event(in_dev);
1159 }
1160 done:
1161 #endif
1162 ip_mc_clear_src(im);
1163 }
1164
1165 static void igmp_group_added(struct ip_mc_list *im)
1166 {
1167 struct in_device *in_dev = im->interface;
1168
1169 if (im->loaded == 0) {
1170 im->loaded = 1;
1171 ip_mc_filter_add(in_dev, im->multiaddr);
1172 }
1173
1174 #ifdef CONFIG_IP_MULTICAST
1175 if (im->multiaddr == IGMP_ALL_HOSTS)
1176 return;
1177
1178 if (in_dev->dead)
1179 return;
1180 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1181 spin_lock_bh(&im->lock);
1182 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1183 spin_unlock_bh(&im->lock);
1184 return;
1185 }
1186 /* else, v3 */
1187
1188 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1189 IGMP_Unsolicited_Report_Count;
1190 igmp_ifc_event(in_dev);
1191 #endif
1192 }
1193
1194
1195 /*
1196 * Multicast list managers
1197 */
1198
1199
1200 /*
1201 * A socket has joined a multicast group on device dev.
1202 */
1203
1204 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1205 {
1206 struct ip_mc_list *im;
1207
1208 ASSERT_RTNL();
1209
1210 for (im=in_dev->mc_list; im; im=im->next) {
1211 if (im->multiaddr == addr) {
1212 im->users++;
1213 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1214 goto out;
1215 }
1216 }
1217
1218 im = kmalloc(sizeof(*im), GFP_KERNEL);
1219 if (!im)
1220 goto out;
1221
1222 im->users=1;
1223 im->interface=in_dev;
1224 in_dev_hold(in_dev);
1225 im->multiaddr=addr;
1226 /* initial mode is (EX, empty) */
1227 im->sfmode = MCAST_EXCLUDE;
1228 im->sfcount[MCAST_INCLUDE] = 0;
1229 im->sfcount[MCAST_EXCLUDE] = 1;
1230 im->sources = NULL;
1231 im->tomb = NULL;
1232 im->crcount = 0;
1233 atomic_set(&im->refcnt, 1);
1234 spin_lock_init(&im->lock);
1235 #ifdef CONFIG_IP_MULTICAST
1236 im->tm_running=0;
1237 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1238 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1239 im->reporter = 0;
1240 im->gsquery = 0;
1241 #endif
1242 im->loaded = 0;
1243 write_lock_bh(&in_dev->mc_list_lock);
1244 im->next=in_dev->mc_list;
1245 in_dev->mc_list=im;
1246 write_unlock_bh(&in_dev->mc_list_lock);
1247 #ifdef CONFIG_IP_MULTICAST
1248 igmpv3_del_delrec(in_dev, im->multiaddr);
1249 #endif
1250 igmp_group_added(im);
1251 if (!in_dev->dead)
1252 ip_rt_multicast_event(in_dev);
1253 out:
1254 return;
1255 }
1256
1257 /*
1258 * Resend IGMP JOIN report; used for bonding.
1259 */
1260 void ip_mc_rejoin_group(struct ip_mc_list *im)
1261 {
1262 #ifdef CONFIG_IP_MULTICAST
1263 struct in_device *in_dev = im->interface;
1264
1265 if (im->multiaddr == IGMP_ALL_HOSTS)
1266 return;
1267
1268 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1269 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1270 return;
1271 }
1272 /* else, v3 */
1273 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1274 IGMP_Unsolicited_Report_Count;
1275 igmp_ifc_event(in_dev);
1276 #endif
1277 }
1278
1279 /*
1280 * A socket has left a multicast group on device dev
1281 */
1282
1283 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1284 {
1285 struct ip_mc_list *i, **ip;
1286
1287 ASSERT_RTNL();
1288
1289 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1290 if (i->multiaddr==addr) {
1291 if (--i->users == 0) {
1292 write_lock_bh(&in_dev->mc_list_lock);
1293 *ip = i->next;
1294 write_unlock_bh(&in_dev->mc_list_lock);
1295 igmp_group_dropped(i);
1296
1297 if (!in_dev->dead)
1298 ip_rt_multicast_event(in_dev);
1299
1300 ip_ma_put(i);
1301 return;
1302 }
1303 break;
1304 }
1305 }
1306 }
1307
1308 /* Device going down */
1309
1310 void ip_mc_down(struct in_device *in_dev)
1311 {
1312 struct ip_mc_list *i;
1313
1314 ASSERT_RTNL();
1315
1316 for (i=in_dev->mc_list; i; i=i->next)
1317 igmp_group_dropped(i);
1318
1319 #ifdef CONFIG_IP_MULTICAST
1320 in_dev->mr_ifc_count = 0;
1321 if (del_timer(&in_dev->mr_ifc_timer))
1322 __in_dev_put(in_dev);
1323 in_dev->mr_gq_running = 0;
1324 if (del_timer(&in_dev->mr_gq_timer))
1325 __in_dev_put(in_dev);
1326 igmpv3_clear_delrec(in_dev);
1327 #endif
1328
1329 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1330 }
1331
1332 void ip_mc_init_dev(struct in_device *in_dev)
1333 {
1334 ASSERT_RTNL();
1335
1336 in_dev->mc_tomb = NULL;
1337 #ifdef CONFIG_IP_MULTICAST
1338 in_dev->mr_gq_running = 0;
1339 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1340 (unsigned long)in_dev);
1341 in_dev->mr_ifc_count = 0;
1342 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1343 (unsigned long)in_dev);
1344 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1345 #endif
1346
1347 rwlock_init(&in_dev->mc_list_lock);
1348 spin_lock_init(&in_dev->mc_tomb_lock);
1349 }
1350
1351 /* Device going up */
1352
1353 void ip_mc_up(struct in_device *in_dev)
1354 {
1355 struct ip_mc_list *i;
1356
1357 ASSERT_RTNL();
1358
1359 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1360
1361 for (i=in_dev->mc_list; i; i=i->next)
1362 igmp_group_added(i);
1363 }
1364
1365 /*
1366 * Device is about to be destroyed: clean up.
1367 */
1368
1369 void ip_mc_destroy_dev(struct in_device *in_dev)
1370 {
1371 struct ip_mc_list *i;
1372
1373 ASSERT_RTNL();
1374
1375 /* Deactivate timers */
1376 ip_mc_down(in_dev);
1377
1378 write_lock_bh(&in_dev->mc_list_lock);
1379 while ((i = in_dev->mc_list) != NULL) {
1380 in_dev->mc_list = i->next;
1381 write_unlock_bh(&in_dev->mc_list_lock);
1382
1383 igmp_group_dropped(i);
1384 ip_ma_put(i);
1385
1386 write_lock_bh(&in_dev->mc_list_lock);
1387 }
1388 write_unlock_bh(&in_dev->mc_list_lock);
1389 }
1390
1391 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1392 {
1393 struct flowi fl = { .nl_u = { .ip4_u =
1394 { .daddr = imr->imr_multiaddr.s_addr } } };
1395 struct rtable *rt;
1396 struct net_device *dev = NULL;
1397 struct in_device *idev = NULL;
1398
1399 if (imr->imr_ifindex) {
1400 idev = inetdev_by_index(imr->imr_ifindex);
1401 if (idev)
1402 __in_dev_put(idev);
1403 return idev;
1404 }
1405 if (imr->imr_address.s_addr) {
1406 dev = ip_dev_find(imr->imr_address.s_addr);
1407 if (!dev)
1408 return NULL;
1409 dev_put(dev);
1410 }
1411
1412 if (!dev && !ip_route_output_key(&rt, &fl)) {
1413 dev = rt->u.dst.dev;
1414 ip_rt_put(rt);
1415 }
1416 if (dev) {
1417 imr->imr_ifindex = dev->ifindex;
1418 idev = __in_dev_get_rtnl(dev);
1419 }
1420 return idev;
1421 }
1422
1423 /*
1424 * Join a socket to a group
1425 */
1426 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1427 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1428
1429
1430 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1431 __be32 *psfsrc)
1432 {
1433 struct ip_sf_list *psf, *psf_prev;
1434 int rv = 0;
1435
1436 psf_prev = NULL;
1437 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1438 if (psf->sf_inaddr == *psfsrc)
1439 break;
1440 psf_prev = psf;
1441 }
1442 if (!psf || psf->sf_count[sfmode] == 0) {
1443 /* source filter not found, or count wrong => bug */
1444 return -ESRCH;
1445 }
1446 psf->sf_count[sfmode]--;
1447 if (psf->sf_count[sfmode] == 0) {
1448 ip_rt_multicast_event(pmc->interface);
1449 }
1450 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1451 #ifdef CONFIG_IP_MULTICAST
1452 struct in_device *in_dev = pmc->interface;
1453 #endif
1454
1455 /* no more filters for this source */
1456 if (psf_prev)
1457 psf_prev->sf_next = psf->sf_next;
1458 else
1459 pmc->sources = psf->sf_next;
1460 #ifdef CONFIG_IP_MULTICAST
1461 if (psf->sf_oldin &&
1462 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1463 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1464 IGMP_Unsolicited_Report_Count;
1465 psf->sf_next = pmc->tomb;
1466 pmc->tomb = psf;
1467 rv = 1;
1468 } else
1469 #endif
1470 kfree(psf);
1471 }
1472 return rv;
1473 }
1474
1475 #ifndef CONFIG_IP_MULTICAST
1476 #define igmp_ifc_event(x) do { } while (0)
1477 #endif
1478
1479 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1480 int sfcount, __be32 *psfsrc, int delta)
1481 {
1482 struct ip_mc_list *pmc;
1483 int changerec = 0;
1484 int i, err;
1485
1486 if (!in_dev)
1487 return -ENODEV;
1488 read_lock(&in_dev->mc_list_lock);
1489 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1490 if (*pmca == pmc->multiaddr)
1491 break;
1492 }
1493 if (!pmc) {
1494 /* MCA not found?? bug */
1495 read_unlock(&in_dev->mc_list_lock);
1496 return -ESRCH;
1497 }
1498 spin_lock_bh(&pmc->lock);
1499 read_unlock(&in_dev->mc_list_lock);
1500 #ifdef CONFIG_IP_MULTICAST
1501 sf_markstate(pmc);
1502 #endif
1503 if (!delta) {
1504 err = -EINVAL;
1505 if (!pmc->sfcount[sfmode])
1506 goto out_unlock;
1507 pmc->sfcount[sfmode]--;
1508 }
1509 err = 0;
1510 for (i=0; i<sfcount; i++) {
1511 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1512
1513 changerec |= rv > 0;
1514 if (!err && rv < 0)
1515 err = rv;
1516 }
1517 if (pmc->sfmode == MCAST_EXCLUDE &&
1518 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1519 pmc->sfcount[MCAST_INCLUDE]) {
1520 #ifdef CONFIG_IP_MULTICAST
1521 struct ip_sf_list *psf;
1522 #endif
1523
1524 /* filter mode change */
1525 pmc->sfmode = MCAST_INCLUDE;
1526 #ifdef CONFIG_IP_MULTICAST
1527 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1528 IGMP_Unsolicited_Report_Count;
1529 in_dev->mr_ifc_count = pmc->crcount;
1530 for (psf=pmc->sources; psf; psf = psf->sf_next)
1531 psf->sf_crcount = 0;
1532 igmp_ifc_event(pmc->interface);
1533 } else if (sf_setstate(pmc) || changerec) {
1534 igmp_ifc_event(pmc->interface);
1535 #endif
1536 }
1537 out_unlock:
1538 spin_unlock_bh(&pmc->lock);
1539 return err;
1540 }
1541
1542 /*
1543 * Add multicast single-source filter to the interface list
1544 */
1545 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1546 __be32 *psfsrc, int delta)
1547 {
1548 struct ip_sf_list *psf, *psf_prev;
1549
1550 psf_prev = NULL;
1551 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1552 if (psf->sf_inaddr == *psfsrc)
1553 break;
1554 psf_prev = psf;
1555 }
1556 if (!psf) {
1557 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1558 if (!psf)
1559 return -ENOBUFS;
1560 psf->sf_inaddr = *psfsrc;
1561 if (psf_prev) {
1562 psf_prev->sf_next = psf;
1563 } else
1564 pmc->sources = psf;
1565 }
1566 psf->sf_count[sfmode]++;
1567 if (psf->sf_count[sfmode] == 1) {
1568 ip_rt_multicast_event(pmc->interface);
1569 }
1570 return 0;
1571 }
1572
1573 #ifdef CONFIG_IP_MULTICAST
1574 static void sf_markstate(struct ip_mc_list *pmc)
1575 {
1576 struct ip_sf_list *psf;
1577 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1578
1579 for (psf=pmc->sources; psf; psf=psf->sf_next)
1580 if (pmc->sfcount[MCAST_EXCLUDE]) {
1581 psf->sf_oldin = mca_xcount ==
1582 psf->sf_count[MCAST_EXCLUDE] &&
1583 !psf->sf_count[MCAST_INCLUDE];
1584 } else
1585 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1586 }
1587
1588 static int sf_setstate(struct ip_mc_list *pmc)
1589 {
1590 struct ip_sf_list *psf, *dpsf;
1591 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1592 int qrv = pmc->interface->mr_qrv;
1593 int new_in, rv;
1594
1595 rv = 0;
1596 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1597 if (pmc->sfcount[MCAST_EXCLUDE]) {
1598 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1599 !psf->sf_count[MCAST_INCLUDE];
1600 } else
1601 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1602 if (new_in) {
1603 if (!psf->sf_oldin) {
1604 struct ip_sf_list *prev = NULL;
1605
1606 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1607 if (dpsf->sf_inaddr == psf->sf_inaddr)
1608 break;
1609 prev = dpsf;
1610 }
1611 if (dpsf) {
1612 if (prev)
1613 prev->sf_next = dpsf->sf_next;
1614 else
1615 pmc->tomb = dpsf->sf_next;
1616 kfree(dpsf);
1617 }
1618 psf->sf_crcount = qrv;
1619 rv++;
1620 }
1621 } else if (psf->sf_oldin) {
1622
1623 psf->sf_crcount = 0;
1624 /*
1625 * add or update "delete" records if an active filter
1626 * is now inactive
1627 */
1628 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1629 if (dpsf->sf_inaddr == psf->sf_inaddr)
1630 break;
1631 if (!dpsf) {
1632 dpsf = (struct ip_sf_list *)
1633 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1634 if (!dpsf)
1635 continue;
1636 *dpsf = *psf;
1637 /* pmc->lock held by callers */
1638 dpsf->sf_next = pmc->tomb;
1639 pmc->tomb = dpsf;
1640 }
1641 dpsf->sf_crcount = qrv;
1642 rv++;
1643 }
1644 }
1645 return rv;
1646 }
1647 #endif
1648
1649 /*
1650 * Add multicast source filter list to the interface list
1651 */
1652 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1653 int sfcount, __be32 *psfsrc, int delta)
1654 {
1655 struct ip_mc_list *pmc;
1656 int isexclude;
1657 int i, err;
1658
1659 if (!in_dev)
1660 return -ENODEV;
1661 read_lock(&in_dev->mc_list_lock);
1662 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1663 if (*pmca == pmc->multiaddr)
1664 break;
1665 }
1666 if (!pmc) {
1667 /* MCA not found?? bug */
1668 read_unlock(&in_dev->mc_list_lock);
1669 return -ESRCH;
1670 }
1671 spin_lock_bh(&pmc->lock);
1672 read_unlock(&in_dev->mc_list_lock);
1673
1674 #ifdef CONFIG_IP_MULTICAST
1675 sf_markstate(pmc);
1676 #endif
1677 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1678 if (!delta)
1679 pmc->sfcount[sfmode]++;
1680 err = 0;
1681 for (i=0; i<sfcount; i++) {
1682 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1683 if (err)
1684 break;
1685 }
1686 if (err) {
1687 int j;
1688
1689 pmc->sfcount[sfmode]--;
1690 for (j=0; j<i; j++)
1691 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1692 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1693 #ifdef CONFIG_IP_MULTICAST
1694 struct ip_sf_list *psf;
1695 in_dev = pmc->interface;
1696 #endif
1697
1698 /* filter mode change */
1699 if (pmc->sfcount[MCAST_EXCLUDE])
1700 pmc->sfmode = MCAST_EXCLUDE;
1701 else if (pmc->sfcount[MCAST_INCLUDE])
1702 pmc->sfmode = MCAST_INCLUDE;
1703 #ifdef CONFIG_IP_MULTICAST
1704 /* else no filters; keep old mode for reports */
1705
1706 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1707 IGMP_Unsolicited_Report_Count;
1708 in_dev->mr_ifc_count = pmc->crcount;
1709 for (psf=pmc->sources; psf; psf = psf->sf_next)
1710 psf->sf_crcount = 0;
1711 igmp_ifc_event(in_dev);
1712 } else if (sf_setstate(pmc)) {
1713 igmp_ifc_event(in_dev);
1714 #endif
1715 }
1716 spin_unlock_bh(&pmc->lock);
1717 return err;
1718 }
1719
1720 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1721 {
1722 struct ip_sf_list *psf, *nextpsf;
1723
1724 for (psf=pmc->tomb; psf; psf=nextpsf) {
1725 nextpsf = psf->sf_next;
1726 kfree(psf);
1727 }
1728 pmc->tomb = NULL;
1729 for (psf=pmc->sources; psf; psf=nextpsf) {
1730 nextpsf = psf->sf_next;
1731 kfree(psf);
1732 }
1733 pmc->sources = NULL;
1734 pmc->sfmode = MCAST_EXCLUDE;
1735 pmc->sfcount[MCAST_INCLUDE] = 0;
1736 pmc->sfcount[MCAST_EXCLUDE] = 1;
1737 }
1738
1739
1740 /*
1741 * Join a multicast group
1742 */
1743 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1744 {
1745 int err;
1746 __be32 addr = imr->imr_multiaddr.s_addr;
1747 struct ip_mc_socklist *iml=NULL, *i;
1748 struct in_device *in_dev;
1749 struct inet_sock *inet = inet_sk(sk);
1750 int ifindex;
1751 int count = 0;
1752
1753 if (!MULTICAST(addr))
1754 return -EINVAL;
1755
1756 rtnl_lock();
1757
1758 in_dev = ip_mc_find_dev(imr);
1759
1760 if (!in_dev) {
1761 iml = NULL;
1762 err = -ENODEV;
1763 goto done;
1764 }
1765
1766 err = -EADDRINUSE;
1767 ifindex = imr->imr_ifindex;
1768 for (i = inet->mc_list; i; i = i->next) {
1769 if (i->multi.imr_multiaddr.s_addr == addr &&
1770 i->multi.imr_ifindex == ifindex)
1771 goto done;
1772 count++;
1773 }
1774 err = -ENOBUFS;
1775 if (count >= sysctl_igmp_max_memberships)
1776 goto done;
1777 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1778 if (iml == NULL)
1779 goto done;
1780
1781 memcpy(&iml->multi, imr, sizeof(*imr));
1782 iml->next = inet->mc_list;
1783 iml->sflist = NULL;
1784 iml->sfmode = MCAST_EXCLUDE;
1785 inet->mc_list = iml;
1786 ip_mc_inc_group(in_dev, addr);
1787 err = 0;
1788 done:
1789 rtnl_unlock();
1790 return err;
1791 }
1792
1793 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1794 struct in_device *in_dev)
1795 {
1796 int err;
1797
1798 if (iml->sflist == NULL) {
1799 /* any-source empty exclude case */
1800 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1801 iml->sfmode, 0, NULL, 0);
1802 }
1803 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1804 iml->sfmode, iml->sflist->sl_count,
1805 iml->sflist->sl_addr, 0);
1806 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1807 iml->sflist = NULL;
1808 return err;
1809 }
1810
1811 /*
1812 * Ask a socket to leave a group.
1813 */
1814
1815 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1816 {
1817 struct inet_sock *inet = inet_sk(sk);
1818 struct ip_mc_socklist *iml, **imlp;
1819 struct in_device *in_dev;
1820 __be32 group = imr->imr_multiaddr.s_addr;
1821 u32 ifindex;
1822 int ret = -EADDRNOTAVAIL;
1823
1824 rtnl_lock();
1825 in_dev = ip_mc_find_dev(imr);
1826 ifindex = imr->imr_ifindex;
1827 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1828 if (iml->multi.imr_multiaddr.s_addr != group)
1829 continue;
1830 if (ifindex) {
1831 if (iml->multi.imr_ifindex != ifindex)
1832 continue;
1833 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1834 iml->multi.imr_address.s_addr)
1835 continue;
1836
1837 (void) ip_mc_leave_src(sk, iml, in_dev);
1838
1839 *imlp = iml->next;
1840
1841 if (in_dev)
1842 ip_mc_dec_group(in_dev, group);
1843 rtnl_unlock();
1844 sock_kfree_s(sk, iml, sizeof(*iml));
1845 return 0;
1846 }
1847 if (!in_dev)
1848 ret = -ENODEV;
1849 rtnl_unlock();
1850 return ret;
1851 }
1852
1853 int ip_mc_source(int add, int omode, struct sock *sk, struct
1854 ip_mreq_source *mreqs, int ifindex)
1855 {
1856 int err;
1857 struct ip_mreqn imr;
1858 __be32 addr = mreqs->imr_multiaddr;
1859 struct ip_mc_socklist *pmc;
1860 struct in_device *in_dev = NULL;
1861 struct inet_sock *inet = inet_sk(sk);
1862 struct ip_sf_socklist *psl;
1863 int leavegroup = 0;
1864 int i, j, rv;
1865
1866 if (!MULTICAST(addr))
1867 return -EINVAL;
1868
1869 rtnl_lock();
1870
1871 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1872 imr.imr_address.s_addr = mreqs->imr_interface;
1873 imr.imr_ifindex = ifindex;
1874 in_dev = ip_mc_find_dev(&imr);
1875
1876 if (!in_dev) {
1877 err = -ENODEV;
1878 goto done;
1879 }
1880 err = -EADDRNOTAVAIL;
1881
1882 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1883 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1884 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1885 break;
1886 }
1887 if (!pmc) { /* must have a prior join */
1888 err = -EINVAL;
1889 goto done;
1890 }
1891 /* if a source filter was set, must be the same mode as before */
1892 if (pmc->sflist) {
1893 if (pmc->sfmode != omode) {
1894 err = -EINVAL;
1895 goto done;
1896 }
1897 } else if (pmc->sfmode != omode) {
1898 /* allow mode switches for empty-set filters */
1899 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1900 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1901 NULL, 0);
1902 pmc->sfmode = omode;
1903 }
1904
1905 psl = pmc->sflist;
1906 if (!add) {
1907 if (!psl)
1908 goto done; /* err = -EADDRNOTAVAIL */
1909 rv = !0;
1910 for (i=0; i<psl->sl_count; i++) {
1911 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1912 sizeof(__be32));
1913 if (rv == 0)
1914 break;
1915 }
1916 if (rv) /* source not found */
1917 goto done; /* err = -EADDRNOTAVAIL */
1918
1919 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1920 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1921 leavegroup = 1;
1922 goto done;
1923 }
1924
1925 /* update the interface filter */
1926 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1927 &mreqs->imr_sourceaddr, 1);
1928
1929 for (j=i+1; j<psl->sl_count; j++)
1930 psl->sl_addr[j-1] = psl->sl_addr[j];
1931 psl->sl_count--;
1932 err = 0;
1933 goto done;
1934 }
1935 /* else, add a new source to the filter */
1936
1937 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1938 err = -ENOBUFS;
1939 goto done;
1940 }
1941 if (!psl || psl->sl_count == psl->sl_max) {
1942 struct ip_sf_socklist *newpsl;
1943 int count = IP_SFBLOCK;
1944
1945 if (psl)
1946 count += psl->sl_max;
1947 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1948 if (!newpsl) {
1949 err = -ENOBUFS;
1950 goto done;
1951 }
1952 newpsl->sl_max = count;
1953 newpsl->sl_count = count - IP_SFBLOCK;
1954 if (psl) {
1955 for (i=0; i<psl->sl_count; i++)
1956 newpsl->sl_addr[i] = psl->sl_addr[i];
1957 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1958 }
1959 pmc->sflist = psl = newpsl;
1960 }
1961 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1962 for (i=0; i<psl->sl_count; i++) {
1963 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1964 sizeof(__be32));
1965 if (rv == 0)
1966 break;
1967 }
1968 if (rv == 0) /* address already there is an error */
1969 goto done;
1970 for (j=psl->sl_count-1; j>=i; j--)
1971 psl->sl_addr[j+1] = psl->sl_addr[j];
1972 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1973 psl->sl_count++;
1974 err = 0;
1975 /* update the interface list */
1976 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1977 &mreqs->imr_sourceaddr, 1);
1978 done:
1979 rtnl_unlock();
1980 if (leavegroup)
1981 return ip_mc_leave_group(sk, &imr);
1982 return err;
1983 }
1984
1985 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1986 {
1987 int err = 0;
1988 struct ip_mreqn imr;
1989 __be32 addr = msf->imsf_multiaddr;
1990 struct ip_mc_socklist *pmc;
1991 struct in_device *in_dev;
1992 struct inet_sock *inet = inet_sk(sk);
1993 struct ip_sf_socklist *newpsl, *psl;
1994 int leavegroup = 0;
1995
1996 if (!MULTICAST(addr))
1997 return -EINVAL;
1998 if (msf->imsf_fmode != MCAST_INCLUDE &&
1999 msf->imsf_fmode != MCAST_EXCLUDE)
2000 return -EINVAL;
2001
2002 rtnl_lock();
2003
2004 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2005 imr.imr_address.s_addr = msf->imsf_interface;
2006 imr.imr_ifindex = ifindex;
2007 in_dev = ip_mc_find_dev(&imr);
2008
2009 if (!in_dev) {
2010 err = -ENODEV;
2011 goto done;
2012 }
2013
2014 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2015 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2016 leavegroup = 1;
2017 goto done;
2018 }
2019
2020 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2021 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2022 pmc->multi.imr_ifindex == imr.imr_ifindex)
2023 break;
2024 }
2025 if (!pmc) { /* must have a prior join */
2026 err = -EINVAL;
2027 goto done;
2028 }
2029 if (msf->imsf_numsrc) {
2030 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2031 GFP_KERNEL);
2032 if (!newpsl) {
2033 err = -ENOBUFS;
2034 goto done;
2035 }
2036 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2037 memcpy(newpsl->sl_addr, msf->imsf_slist,
2038 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2039 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2040 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2041 if (err) {
2042 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2043 goto done;
2044 }
2045 } else {
2046 newpsl = NULL;
2047 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2048 msf->imsf_fmode, 0, NULL, 0);
2049 }
2050 psl = pmc->sflist;
2051 if (psl) {
2052 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2053 psl->sl_count, psl->sl_addr, 0);
2054 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2055 } else
2056 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2057 0, NULL, 0);
2058 pmc->sflist = newpsl;
2059 pmc->sfmode = msf->imsf_fmode;
2060 err = 0;
2061 done:
2062 rtnl_unlock();
2063 if (leavegroup)
2064 err = ip_mc_leave_group(sk, &imr);
2065 return err;
2066 }
2067
2068 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2069 struct ip_msfilter __user *optval, int __user *optlen)
2070 {
2071 int err, len, count, copycount;
2072 struct ip_mreqn imr;
2073 __be32 addr = msf->imsf_multiaddr;
2074 struct ip_mc_socklist *pmc;
2075 struct in_device *in_dev;
2076 struct inet_sock *inet = inet_sk(sk);
2077 struct ip_sf_socklist *psl;
2078
2079 if (!MULTICAST(addr))
2080 return -EINVAL;
2081
2082 rtnl_lock();
2083
2084 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2085 imr.imr_address.s_addr = msf->imsf_interface;
2086 imr.imr_ifindex = 0;
2087 in_dev = ip_mc_find_dev(&imr);
2088
2089 if (!in_dev) {
2090 err = -ENODEV;
2091 goto done;
2092 }
2093 err = -EADDRNOTAVAIL;
2094
2095 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2096 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2097 pmc->multi.imr_ifindex == imr.imr_ifindex)
2098 break;
2099 }
2100 if (!pmc) /* must have a prior join */
2101 goto done;
2102 msf->imsf_fmode = pmc->sfmode;
2103 psl = pmc->sflist;
2104 rtnl_unlock();
2105 if (!psl) {
2106 len = 0;
2107 count = 0;
2108 } else {
2109 count = psl->sl_count;
2110 }
2111 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2112 len = copycount * sizeof(psl->sl_addr[0]);
2113 msf->imsf_numsrc = count;
2114 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2115 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2116 return -EFAULT;
2117 }
2118 if (len &&
2119 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2120 return -EFAULT;
2121 return 0;
2122 done:
2123 rtnl_unlock();
2124 return err;
2125 }
2126
2127 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2128 struct group_filter __user *optval, int __user *optlen)
2129 {
2130 int err, i, count, copycount;
2131 struct sockaddr_in *psin;
2132 __be32 addr;
2133 struct ip_mc_socklist *pmc;
2134 struct inet_sock *inet = inet_sk(sk);
2135 struct ip_sf_socklist *psl;
2136
2137 psin = (struct sockaddr_in *)&gsf->gf_group;
2138 if (psin->sin_family != AF_INET)
2139 return -EINVAL;
2140 addr = psin->sin_addr.s_addr;
2141 if (!MULTICAST(addr))
2142 return -EINVAL;
2143
2144 rtnl_lock();
2145
2146 err = -EADDRNOTAVAIL;
2147
2148 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2149 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2150 pmc->multi.imr_ifindex == gsf->gf_interface)
2151 break;
2152 }
2153 if (!pmc) /* must have a prior join */
2154 goto done;
2155 gsf->gf_fmode = pmc->sfmode;
2156 psl = pmc->sflist;
2157 rtnl_unlock();
2158 count = psl ? psl->sl_count : 0;
2159 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2160 gsf->gf_numsrc = count;
2161 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2162 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2163 return -EFAULT;
2164 }
2165 for (i=0; i<copycount; i++) {
2166 struct sockaddr_storage ss;
2167
2168 psin = (struct sockaddr_in *)&ss;
2169 memset(&ss, 0, sizeof(ss));
2170 psin->sin_family = AF_INET;
2171 psin->sin_addr.s_addr = psl->sl_addr[i];
2172 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2173 return -EFAULT;
2174 }
2175 return 0;
2176 done:
2177 rtnl_unlock();
2178 return err;
2179 }
2180
2181 /*
2182 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2183 */
2184 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2185 {
2186 struct inet_sock *inet = inet_sk(sk);
2187 struct ip_mc_socklist *pmc;
2188 struct ip_sf_socklist *psl;
2189 int i;
2190
2191 if (!MULTICAST(loc_addr))
2192 return 1;
2193
2194 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2195 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2196 pmc->multi.imr_ifindex == dif)
2197 break;
2198 }
2199 if (!pmc)
2200 return 1;
2201 psl = pmc->sflist;
2202 if (!psl)
2203 return pmc->sfmode == MCAST_EXCLUDE;
2204
2205 for (i=0; i<psl->sl_count; i++) {
2206 if (psl->sl_addr[i] == rmt_addr)
2207 break;
2208 }
2209 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2210 return 0;
2211 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2212 return 0;
2213 return 1;
2214 }
2215
2216 /*
2217 * A socket is closing.
2218 */
2219
2220 void ip_mc_drop_socket(struct sock *sk)
2221 {
2222 struct inet_sock *inet = inet_sk(sk);
2223 struct ip_mc_socklist *iml;
2224
2225 if (inet->mc_list == NULL)
2226 return;
2227
2228 rtnl_lock();
2229 while ((iml = inet->mc_list) != NULL) {
2230 struct in_device *in_dev;
2231 inet->mc_list = iml->next;
2232
2233 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
2234 (void) ip_mc_leave_src(sk, iml, in_dev);
2235 if (in_dev != NULL) {
2236 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2237 in_dev_put(in_dev);
2238 }
2239 sock_kfree_s(sk, iml, sizeof(*iml));
2240 }
2241 rtnl_unlock();
2242 }
2243
2244 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2245 {
2246 struct ip_mc_list *im;
2247 struct ip_sf_list *psf;
2248 int rv = 0;
2249
2250 read_lock(&in_dev->mc_list_lock);
2251 for (im=in_dev->mc_list; im; im=im->next) {
2252 if (im->multiaddr == mc_addr)
2253 break;
2254 }
2255 if (im && proto == IPPROTO_IGMP) {
2256 rv = 1;
2257 } else if (im) {
2258 if (src_addr) {
2259 for (psf=im->sources; psf; psf=psf->sf_next) {
2260 if (psf->sf_inaddr == src_addr)
2261 break;
2262 }
2263 if (psf)
2264 rv = psf->sf_count[MCAST_INCLUDE] ||
2265 psf->sf_count[MCAST_EXCLUDE] !=
2266 im->sfcount[MCAST_EXCLUDE];
2267 else
2268 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2269 } else
2270 rv = 1; /* unspecified source; tentatively allow */
2271 }
2272 read_unlock(&in_dev->mc_list_lock);
2273 return rv;
2274 }
2275
2276 #if defined(CONFIG_PROC_FS)
2277 struct igmp_mc_iter_state {
2278 struct net_device *dev;
2279 struct in_device *in_dev;
2280 };
2281
2282 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2283
2284 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2285 {
2286 struct ip_mc_list *im = NULL;
2287 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2288
2289 state->in_dev = NULL;
2290 for_each_netdev(&init_net, state->dev) {
2291 struct in_device *in_dev;
2292 in_dev = in_dev_get(state->dev);
2293 if (!in_dev)
2294 continue;
2295 read_lock(&in_dev->mc_list_lock);
2296 im = in_dev->mc_list;
2297 if (im) {
2298 state->in_dev = in_dev;
2299 break;
2300 }
2301 read_unlock(&in_dev->mc_list_lock);
2302 in_dev_put(in_dev);
2303 }
2304 return im;
2305 }
2306
2307 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2308 {
2309 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2310 im = im->next;
2311 while (!im) {
2312 if (likely(state->in_dev != NULL)) {
2313 read_unlock(&state->in_dev->mc_list_lock);
2314 in_dev_put(state->in_dev);
2315 }
2316 state->dev = next_net_device(state->dev);
2317 if (!state->dev) {
2318 state->in_dev = NULL;
2319 break;
2320 }
2321 state->in_dev = in_dev_get(state->dev);
2322 if (!state->in_dev)
2323 continue;
2324 read_lock(&state->in_dev->mc_list_lock);
2325 im = state->in_dev->mc_list;
2326 }
2327 return im;
2328 }
2329
2330 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2331 {
2332 struct ip_mc_list *im = igmp_mc_get_first(seq);
2333 if (im)
2334 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2335 --pos;
2336 return pos ? NULL : im;
2337 }
2338
2339 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2340 {
2341 read_lock(&dev_base_lock);
2342 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2343 }
2344
2345 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2346 {
2347 struct ip_mc_list *im;
2348 if (v == SEQ_START_TOKEN)
2349 im = igmp_mc_get_first(seq);
2350 else
2351 im = igmp_mc_get_next(seq, v);
2352 ++*pos;
2353 return im;
2354 }
2355
2356 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2357 {
2358 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2359 if (likely(state->in_dev != NULL)) {
2360 read_unlock(&state->in_dev->mc_list_lock);
2361 in_dev_put(state->in_dev);
2362 state->in_dev = NULL;
2363 }
2364 state->dev = NULL;
2365 read_unlock(&dev_base_lock);
2366 }
2367
2368 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2369 {
2370 if (v == SEQ_START_TOKEN)
2371 seq_puts(seq,
2372 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2373 else {
2374 struct ip_mc_list *im = (struct ip_mc_list *)v;
2375 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2376 char *querier;
2377 #ifdef CONFIG_IP_MULTICAST
2378 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2379 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2380 "V3";
2381 #else
2382 querier = "NONE";
2383 #endif
2384
2385 if (state->in_dev->mc_list == im) {
2386 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2387 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2388 }
2389
2390 seq_printf(seq,
2391 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2392 im->multiaddr, im->users,
2393 im->tm_running, im->tm_running ?
2394 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2395 im->reporter);
2396 }
2397 return 0;
2398 }
2399
2400 static const struct seq_operations igmp_mc_seq_ops = {
2401 .start = igmp_mc_seq_start,
2402 .next = igmp_mc_seq_next,
2403 .stop = igmp_mc_seq_stop,
2404 .show = igmp_mc_seq_show,
2405 };
2406
2407 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2408 {
2409 return seq_open_private(file, &igmp_mc_seq_ops,
2410 sizeof(struct igmp_mc_iter_state));
2411 }
2412
2413 static const struct file_operations igmp_mc_seq_fops = {
2414 .owner = THIS_MODULE,
2415 .open = igmp_mc_seq_open,
2416 .read = seq_read,
2417 .llseek = seq_lseek,
2418 .release = seq_release_private,
2419 };
2420
2421 struct igmp_mcf_iter_state {
2422 struct net_device *dev;
2423 struct in_device *idev;
2424 struct ip_mc_list *im;
2425 };
2426
2427 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2428
2429 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2430 {
2431 struct ip_sf_list *psf = NULL;
2432 struct ip_mc_list *im = NULL;
2433 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2434
2435 state->idev = NULL;
2436 state->im = NULL;
2437 for_each_netdev(&init_net, state->dev) {
2438 struct in_device *idev;
2439 idev = in_dev_get(state->dev);
2440 if (unlikely(idev == NULL))
2441 continue;
2442 read_lock(&idev->mc_list_lock);
2443 im = idev->mc_list;
2444 if (likely(im != NULL)) {
2445 spin_lock_bh(&im->lock);
2446 psf = im->sources;
2447 if (likely(psf != NULL)) {
2448 state->im = im;
2449 state->idev = idev;
2450 break;
2451 }
2452 spin_unlock_bh(&im->lock);
2453 }
2454 read_unlock(&idev->mc_list_lock);
2455 in_dev_put(idev);
2456 }
2457 return psf;
2458 }
2459
2460 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2461 {
2462 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2463
2464 psf = psf->sf_next;
2465 while (!psf) {
2466 spin_unlock_bh(&state->im->lock);
2467 state->im = state->im->next;
2468 while (!state->im) {
2469 if (likely(state->idev != NULL)) {
2470 read_unlock(&state->idev->mc_list_lock);
2471 in_dev_put(state->idev);
2472 }
2473 state->dev = next_net_device(state->dev);
2474 if (!state->dev) {
2475 state->idev = NULL;
2476 goto out;
2477 }
2478 state->idev = in_dev_get(state->dev);
2479 if (!state->idev)
2480 continue;
2481 read_lock(&state->idev->mc_list_lock);
2482 state->im = state->idev->mc_list;
2483 }
2484 if (!state->im)
2485 break;
2486 spin_lock_bh(&state->im->lock);
2487 psf = state->im->sources;
2488 }
2489 out:
2490 return psf;
2491 }
2492
2493 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2494 {
2495 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2496 if (psf)
2497 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2498 --pos;
2499 return pos ? NULL : psf;
2500 }
2501
2502 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2503 {
2504 read_lock(&dev_base_lock);
2505 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2506 }
2507
2508 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2509 {
2510 struct ip_sf_list *psf;
2511 if (v == SEQ_START_TOKEN)
2512 psf = igmp_mcf_get_first(seq);
2513 else
2514 psf = igmp_mcf_get_next(seq, v);
2515 ++*pos;
2516 return psf;
2517 }
2518
2519 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2520 {
2521 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2522 if (likely(state->im != NULL)) {
2523 spin_unlock_bh(&state->im->lock);
2524 state->im = NULL;
2525 }
2526 if (likely(state->idev != NULL)) {
2527 read_unlock(&state->idev->mc_list_lock);
2528 in_dev_put(state->idev);
2529 state->idev = NULL;
2530 }
2531 state->dev = NULL;
2532 read_unlock(&dev_base_lock);
2533 }
2534
2535 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2536 {
2537 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2538 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2539
2540 if (v == SEQ_START_TOKEN) {
2541 seq_printf(seq,
2542 "%3s %6s "
2543 "%10s %10s %6s %6s\n", "Idx",
2544 "Device", "MCA",
2545 "SRC", "INC", "EXC");
2546 } else {
2547 seq_printf(seq,
2548 "%3d %6.6s 0x%08x "
2549 "0x%08x %6lu %6lu\n",
2550 state->dev->ifindex, state->dev->name,
2551 ntohl(state->im->multiaddr),
2552 ntohl(psf->sf_inaddr),
2553 psf->sf_count[MCAST_INCLUDE],
2554 psf->sf_count[MCAST_EXCLUDE]);
2555 }
2556 return 0;
2557 }
2558
2559 static const struct seq_operations igmp_mcf_seq_ops = {
2560 .start = igmp_mcf_seq_start,
2561 .next = igmp_mcf_seq_next,
2562 .stop = igmp_mcf_seq_stop,
2563 .show = igmp_mcf_seq_show,
2564 };
2565
2566 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2567 {
2568 return seq_open_private(file, &igmp_mcf_seq_ops,
2569 sizeof(struct igmp_mcf_iter_state));
2570 }
2571
2572 static const struct file_operations igmp_mcf_seq_fops = {
2573 .owner = THIS_MODULE,
2574 .open = igmp_mcf_seq_open,
2575 .read = seq_read,
2576 .llseek = seq_lseek,
2577 .release = seq_release_private,
2578 };
2579
2580 int __init igmp_mc_proc_init(void)
2581 {
2582 proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2583 proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2584 return 0;
2585 }
2586 #endif
2587
2588 EXPORT_SYMBOL(ip_mc_dec_group);
2589 EXPORT_SYMBOL(ip_mc_inc_group);
2590 EXPORT_SYMBOL(ip_mc_join_group);
2591 EXPORT_SYMBOL(ip_mc_rejoin_group);
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