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 1.46 2001/07/27 09:27:29 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
76 #include <linux/config.h>
77 #include <asm/uaccess.h>
78 #include <asm/system.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/sched.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 <net/ip.h>
94 #include <net/protocol.h>
95 #include <net/route.h>
96 #include <net/sock.h>
97 #include <net/checksum.h>
98 #include <linux/netfilter_ipv4.h>
99 #ifdef CONFIG_IP_MROUTE
100 #include <linux/mroute.h>
101 #endif
102
103
104 #define IP_MAX_MEMBERSHIPS 20
105 #define IP_MAX_MSF 10
106
107 #ifdef CONFIG_IP_MULTICAST
108 /* Parameter names and values are taken from igmp-v2-06 draft */
109
110 #define IGMP_V1_Router_Present_Timeout (400*HZ)
111 #define IGMP_V2_Router_Present_Timeout (400*HZ)
112 #define IGMP_Unsolicited_Report_Interval (10*HZ)
113 #define IGMP_Query_Response_Interval (10*HZ)
114 #define IGMP_Unsolicited_Report_Count 2
115
116
117 #define IGMP_Initial_Report_Delay (1)
118
119 /* IGMP_Initial_Report_Delay is not from IGMP specs!
120 * IGMP specs require to report membership immediately after
121 * joining a group, but we delay the first report by a
122 * small interval. It seems more natural and still does not
123 * contradict to specs provided this delay is small enough.
124 */
125
126 #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \
127 (in_dev)->cnf.force_igmp_version == 1 || \
128 ((in_dev)->mr_v1_seen && \
129 time_before(jiffies, (in_dev)->mr_v1_seen)))
130 #define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \
131 (in_dev)->cnf.force_igmp_version == 2 || \
132 ((in_dev)->mr_v2_seen && \
133 time_before(jiffies, (in_dev)->mr_v2_seen)))
134
135 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
136 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr);
137 static void igmpv3_clear_delrec(struct in_device *in_dev);
138 static int sf_setstate(struct ip_mc_list *pmc);
139 static void sf_markstate(struct ip_mc_list *pmc);
140 #endif
141 static void ip_mc_clear_src(struct ip_mc_list *pmc);
142 int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
143 int sfcount, __u32 *psfsrc, int delta);
144
ip_ma_put(struct ip_mc_list * im)145 static void ip_ma_put(struct ip_mc_list *im)
146 {
147 if (atomic_dec_and_test(&im->refcnt)) {
148 in_dev_put(im->interface);
149 kfree(im);
150 }
151 }
152
153 #ifdef CONFIG_IP_MULTICAST
154
155 /*
156 * Timer management
157 */
158
igmp_stop_timer(struct ip_mc_list * im)159 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
160 {
161 spin_lock_bh(&im->lock);
162 if (del_timer(&im->timer))
163 atomic_dec(&im->refcnt);
164 im->tm_running=0;
165 im->reporter = 0;
166 im->unsolicit_count = 0;
167 spin_unlock_bh(&im->lock);
168 }
169
170 /* It must be called with locked im->lock */
igmp_start_timer(struct ip_mc_list * im,int max_delay)171 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
172 {
173 int tv=net_random() % max_delay;
174
175 im->tm_running=1;
176 if (!mod_timer(&im->timer, jiffies+tv+2))
177 atomic_inc(&im->refcnt);
178 }
179
igmp_gq_start_timer(struct in_device * in_dev)180 static void igmp_gq_start_timer(struct in_device *in_dev)
181 {
182 int tv = net_random() % in_dev->mr_maxdelay;
183
184 in_dev->mr_gq_running = 1;
185 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
186 in_dev_hold(in_dev);
187 }
188
igmp_ifc_start_timer(struct in_device * in_dev,int delay)189 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
190 {
191 int tv = net_random() % delay;
192
193 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
194 in_dev_hold(in_dev);
195 }
196
igmp_mod_timer(struct ip_mc_list * im,int max_delay)197 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
198 {
199 spin_lock_bh(&im->lock);
200 im->unsolicit_count = 0;
201 if (del_timer(&im->timer)) {
202 if ((long)(im->timer.expires-jiffies) < max_delay) {
203 add_timer(&im->timer);
204 im->tm_running=1;
205 spin_unlock_bh(&im->lock);
206 return;
207 }
208 atomic_dec(&im->refcnt);
209 }
210 igmp_start_timer(im, max_delay);
211 spin_unlock_bh(&im->lock);
212 }
213
214
215 /*
216 * Send an IGMP report.
217 */
218
219 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
220
221 /* Don't just hand NF_HOOK skb->dst->output, in case netfilter hook
222 changes route */
223 static inline int
output_maybe_reroute(struct sk_buff * skb)224 output_maybe_reroute(struct sk_buff *skb)
225 {
226 return skb->dst->output(skb);
227 }
228
229
is_in(struct ip_mc_list * pmc,struct ip_sf_list * psf,int type,int gdeleted,int sdeleted)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 return !(pmc->gsquery && !psf->sf_gsresp);
239 case IGMPV3_CHANGE_TO_INCLUDE:
240 if (gdeleted || sdeleted)
241 return 0;
242 return psf->sf_count[MCAST_INCLUDE] != 0;
243 case IGMPV3_CHANGE_TO_EXCLUDE:
244 if (gdeleted || sdeleted)
245 return 0;
246 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
247 psf->sf_count[MCAST_INCLUDE])
248 return 0;
249 return pmc->sfcount[MCAST_EXCLUDE] ==
250 psf->sf_count[MCAST_EXCLUDE];
251 case IGMPV3_ALLOW_NEW_SOURCES:
252 if (gdeleted || !psf->sf_crcount)
253 return 0;
254 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
255 case IGMPV3_BLOCK_OLD_SOURCES:
256 if (pmc->sfmode == MCAST_INCLUDE)
257 return gdeleted || (psf->sf_crcount && sdeleted);
258 return psf->sf_crcount && !gdeleted && !sdeleted;
259 }
260 return 0;
261 }
262
263 static int
igmp_scount(struct ip_mc_list * pmc,int type,int gdeleted,int sdeleted)264 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
265 {
266 struct ip_sf_list *psf;
267 int scount = 0;
268
269 for (psf=pmc->sources; psf; psf=psf->sf_next) {
270 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
271 continue;
272 scount++;
273 }
274 return scount;
275 }
276
igmpv3_newpack(struct net_device * dev,int size)277 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
278 {
279 struct sk_buff *skb;
280 struct rtable *rt;
281 struct iphdr *pip;
282 struct igmpv3_report *pig;
283 u32 dst;
284
285 dst = IGMPV3_ALL_MCR;
286 if (ip_route_output(&rt, dst, 0, 0, dev->ifindex))
287 return 0;
288 if (rt->rt_src == 0) {
289 ip_rt_put(rt);
290 return 0;
291 }
292 skb = alloc_skb(size + dev->hard_header_len + 15, GFP_ATOMIC);
293 if (skb == NULL) {
294 ip_rt_put(rt);
295 return 0;
296 }
297
298 skb->dst = &rt->u.dst;
299 skb->dev = dev;
300
301 skb_reserve(skb, (dev->hard_header_len+15)&~15);
302
303 skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
304
305 pip->version = 4;
306 pip->ihl = (sizeof(struct iphdr)+4)>>2;
307 pip->tos = 0xc0;
308 pip->frag_off = htons(IP_DF);
309 pip->ttl = 1;
310 pip->daddr = rt->rt_dst;
311 pip->saddr = rt->rt_src;
312 pip->protocol = IPPROTO_IGMP;
313 pip->tot_len = 0; /* filled in later */
314 ip_select_ident(pip, &rt->u.dst, NULL);
315 ((u8*)&pip[1])[0] = IPOPT_RA;
316 ((u8*)&pip[1])[1] = 4;
317 ((u8*)&pip[1])[2] = 0;
318 ((u8*)&pip[1])[3] = 0;
319
320 pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig));
321 skb->h.igmph = (struct igmphdr *)pig;
322 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
323 pig->resv1 = 0;
324 pig->csum = 0;
325 pig->resv2 = 0;
326 pig->ngrec = 0;
327 return skb;
328 }
329
igmpv3_sendpack(struct sk_buff * skb)330 static int igmpv3_sendpack(struct sk_buff *skb)
331 {
332 struct iphdr *pip = skb->nh.iph;
333 struct igmphdr *pig = skb->h.igmph;
334 int iplen, igmplen;
335
336 iplen = skb->tail - (unsigned char *)skb->nh.iph;
337 pip->tot_len = htons(iplen);
338 ip_send_check(pip);
339
340 igmplen = skb->tail - (unsigned char *)skb->h.igmph;
341 pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen);
342
343 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
344 output_maybe_reroute);
345 }
346
grec_size(struct ip_mc_list * pmc,int type,int gdel,int sdel)347 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
348 {
349 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
350 }
351
add_grhead(struct sk_buff * skb,struct ip_mc_list * pmc,int type,struct igmpv3_grec ** ppgr)352 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
353 int type, struct igmpv3_grec **ppgr)
354 {
355 struct net_device *dev = pmc->interface->dev;
356 struct igmpv3_report *pih;
357 struct igmpv3_grec *pgr;
358
359 if (!skb)
360 skb = igmpv3_newpack(dev, dev->mtu);
361 if (!skb)
362 return 0;
363 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
364 pgr->grec_type = type;
365 pgr->grec_auxwords = 0;
366 pgr->grec_nsrcs = 0;
367 pgr->grec_mca = pmc->multiaddr;
368 pih = (struct igmpv3_report *)skb->h.igmph;
369 pih->ngrec = htons(ntohs(pih->ngrec)+1);
370 *ppgr = pgr;
371 return skb;
372 }
373
374 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
375 skb_tailroom(skb)) : 0)
376
add_grec(struct sk_buff * skb,struct ip_mc_list * pmc,int type,int gdeleted,int sdeleted)377 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
378 int type, int gdeleted, int sdeleted)
379 {
380 struct net_device *dev = pmc->interface->dev;
381 struct igmpv3_report *pih;
382 struct igmpv3_grec *pgr = 0;
383 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
384 int scount, first, isquery, truncate;
385
386 if (pmc->multiaddr == IGMP_ALL_HOSTS)
387 return skb;
388
389 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
390 type == IGMPV3_MODE_IS_EXCLUDE;
391 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
392 type == IGMPV3_CHANGE_TO_EXCLUDE;
393
394 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
395
396 if (!*psf_list) {
397 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
398 type == IGMPV3_BLOCK_OLD_SOURCES)
399 return skb;
400 if (pmc->crcount || isquery) {
401 /* make sure we have room for group header and at
402 * least one source.
403 */
404 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)+
405 sizeof(__u32)) {
406 igmpv3_sendpack(skb);
407 skb = 0; /* add_grhead will get a new one */
408 }
409 skb = add_grhead(skb, pmc, type, &pgr);
410 }
411 return skb;
412 }
413 pih = skb ? (struct igmpv3_report *)skb->h.igmph : 0;
414
415 /* EX and TO_EX get a fresh packet, if needed */
416 if (truncate) {
417 if (pih && pih->ngrec &&
418 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
419 if (skb)
420 igmpv3_sendpack(skb);
421 skb = igmpv3_newpack(dev, dev->mtu);
422 }
423 }
424 first = 1;
425 scount = 0;
426 psf_prev = 0;
427 for (psf=*psf_list; psf; psf=psf_next) {
428 u32 *psrc;
429
430 psf_next = psf->sf_next;
431
432 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
433 psf_prev = psf;
434 continue;
435 }
436
437 /* clear marks on query responses */
438 if (isquery)
439 psf->sf_gsresp = 0;
440
441 if (AVAILABLE(skb) < sizeof(u32) +
442 first*sizeof(struct igmpv3_grec)) {
443 if (truncate && !first)
444 break; /* truncate these */
445 if (pgr)
446 pgr->grec_nsrcs = htons(scount);
447 if (skb)
448 igmpv3_sendpack(skb);
449 skb = igmpv3_newpack(dev, dev->mtu);
450 first = 1;
451 scount = 0;
452 }
453 if (first) {
454 skb = add_grhead(skb, pmc, type, &pgr);
455 first = 0;
456 }
457 psrc = (u32 *)skb_put(skb, sizeof(u32));
458 *psrc = psf->sf_inaddr;
459 scount++;
460 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
461 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
462 psf->sf_crcount--;
463 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
464 if (psf_prev)
465 psf_prev->sf_next = psf->sf_next;
466 else
467 *psf_list = psf->sf_next;
468 kfree(psf);
469 continue;
470 }
471 }
472 psf_prev = psf;
473 }
474 if (pgr)
475 pgr->grec_nsrcs = htons(scount);
476
477 if (isquery)
478 pmc->gsquery = 0; /* clear query state on report */
479 return skb;
480 }
481
igmpv3_send_report(struct in_device * in_dev,struct ip_mc_list * pmc)482 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
483 {
484 struct sk_buff *skb = 0;
485 int type;
486
487 if (!pmc) {
488 read_lock(&in_dev->lock);
489 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
490 if (pmc->multiaddr == IGMP_ALL_HOSTS)
491 continue;
492 spin_lock_bh(&pmc->lock);
493 if (pmc->sfcount[MCAST_EXCLUDE])
494 type = IGMPV3_MODE_IS_EXCLUDE;
495 else
496 type = IGMPV3_MODE_IS_INCLUDE;
497 skb = add_grec(skb, pmc, type, 0, 0);
498 spin_unlock_bh(&pmc->lock);
499 }
500 read_unlock(&in_dev->lock);
501 } else {
502 spin_lock_bh(&pmc->lock);
503 if (pmc->sfcount[MCAST_EXCLUDE])
504 type = IGMPV3_MODE_IS_EXCLUDE;
505 else
506 type = IGMPV3_MODE_IS_INCLUDE;
507 skb = add_grec(skb, pmc, type, 0, 0);
508 spin_unlock_bh(&pmc->lock);
509 }
510 if (!skb)
511 return 0;
512 return igmpv3_sendpack(skb);
513 }
514
515 /*
516 * remove zero-count source records from a source filter list
517 */
igmpv3_clear_zeros(struct ip_sf_list ** ppsf)518 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
519 {
520 struct ip_sf_list *psf_prev, *psf_next, *psf;
521
522 psf_prev = 0;
523 for (psf=*ppsf; psf; psf = psf_next) {
524 psf_next = psf->sf_next;
525 if (psf->sf_crcount == 0) {
526 if (psf_prev)
527 psf_prev->sf_next = psf->sf_next;
528 else
529 *ppsf = psf->sf_next;
530 kfree(psf);
531 } else
532 psf_prev = psf;
533 }
534 }
535
igmpv3_send_cr(struct in_device * in_dev)536 static void igmpv3_send_cr(struct in_device *in_dev)
537 {
538 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
539 struct sk_buff *skb = 0;
540 int type, dtype;
541
542 read_lock(&in_dev->lock);
543 write_lock_bh(&in_dev->mc_lock);
544
545 /* deleted MCA's */
546 pmc_prev = 0;
547 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
548 pmc_next = pmc->next;
549 if (pmc->sfmode == MCAST_INCLUDE) {
550 type = IGMPV3_BLOCK_OLD_SOURCES;
551 dtype = IGMPV3_BLOCK_OLD_SOURCES;
552 skb = add_grec(skb, pmc, type, 1, 0);
553 skb = add_grec(skb, pmc, dtype, 1, 1);
554 }
555 if (pmc->crcount) {
556 pmc->crcount--;
557 if (pmc->sfmode == MCAST_EXCLUDE) {
558 type = IGMPV3_CHANGE_TO_INCLUDE;
559 skb = add_grec(skb, pmc, type, 1, 0);
560 }
561 if (pmc->crcount == 0) {
562 igmpv3_clear_zeros(&pmc->tomb);
563 igmpv3_clear_zeros(&pmc->sources);
564 }
565 }
566 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
567 if (pmc_prev)
568 pmc_prev->next = pmc_next;
569 else
570 in_dev->mc_tomb = pmc_next;
571 in_dev_put(pmc->interface);
572 kfree(pmc);
573 } else
574 pmc_prev = pmc;
575 }
576 write_unlock_bh(&in_dev->mc_lock);
577
578 /* change recs */
579 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
580 spin_lock_bh(&pmc->lock);
581 if (pmc->sfcount[MCAST_EXCLUDE]) {
582 type = IGMPV3_BLOCK_OLD_SOURCES;
583 dtype = IGMPV3_ALLOW_NEW_SOURCES;
584 } else {
585 type = IGMPV3_ALLOW_NEW_SOURCES;
586 dtype = IGMPV3_BLOCK_OLD_SOURCES;
587 }
588 skb = add_grec(skb, pmc, type, 0, 0);
589 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
590
591 /* filter mode changes */
592 if (pmc->crcount) {
593 pmc->crcount--;
594 if (pmc->sfmode == MCAST_EXCLUDE)
595 type = IGMPV3_CHANGE_TO_EXCLUDE;
596 else
597 type = IGMPV3_CHANGE_TO_INCLUDE;
598 skb = add_grec(skb, pmc, type, 0, 0);
599 }
600 spin_unlock_bh(&pmc->lock);
601 }
602 read_unlock(&in_dev->lock);
603 if (!skb)
604 return;
605 (void) igmpv3_sendpack(skb);
606 }
607
igmp_send_report(struct in_device * in_dev,struct ip_mc_list * pmc,int type)608 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
609 int type)
610 {
611 struct sk_buff *skb;
612 struct iphdr *iph;
613 struct igmphdr *ih;
614 struct rtable *rt;
615 struct net_device *dev = in_dev->dev;
616 u32 group = pmc ? pmc->multiaddr : 0;
617 u32 dst;
618
619 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
620 return igmpv3_send_report(in_dev, pmc);
621 else if (type == IGMP_HOST_LEAVE_MESSAGE)
622 dst = IGMP_ALL_ROUTER;
623 else
624 dst = group;
625
626 if (ip_route_output(&rt, dst, 0, 0, dev->ifindex))
627 return -1;
628 if (rt->rt_src == 0) {
629 ip_rt_put(rt);
630 return -1;
631 }
632
633 skb=alloc_skb(IGMP_SIZE+dev->hard_header_len+15, GFP_ATOMIC);
634 if (skb == NULL) {
635 ip_rt_put(rt);
636 return -1;
637 }
638
639 skb->dst = &rt->u.dst;
640
641 skb_reserve(skb, (dev->hard_header_len+15)&~15);
642
643 skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
644
645 iph->version = 4;
646 iph->ihl = (sizeof(struct iphdr)+4)>>2;
647 iph->tos = 0xc0;
648 iph->frag_off = htons(IP_DF);
649 iph->ttl = 1;
650 iph->daddr = dst;
651 iph->saddr = rt->rt_src;
652 iph->protocol = IPPROTO_IGMP;
653 iph->tot_len = htons(IGMP_SIZE);
654 ip_select_ident(iph, &rt->u.dst, NULL);
655 ((u8*)&iph[1])[0] = IPOPT_RA;
656 ((u8*)&iph[1])[1] = 4;
657 ((u8*)&iph[1])[2] = 0;
658 ((u8*)&iph[1])[3] = 0;
659 ip_send_check(iph);
660
661 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
662 ih->type=type;
663 ih->code=0;
664 ih->csum=0;
665 ih->group=group;
666 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
667
668 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
669 output_maybe_reroute);
670 }
671
igmp_gq_timer_expire(unsigned long data)672 static void igmp_gq_timer_expire(unsigned long data)
673 {
674 struct in_device *in_dev = (struct in_device *)data;
675
676 in_dev->mr_gq_running = 0;
677 igmpv3_send_report(in_dev, 0);
678 __in_dev_put(in_dev);
679 }
680
igmp_ifc_timer_expire(unsigned long data)681 static void igmp_ifc_timer_expire(unsigned long data)
682 {
683 struct in_device *in_dev = (struct in_device *)data;
684
685 igmpv3_send_cr(in_dev);
686 if (in_dev->mr_ifc_count) {
687 in_dev->mr_ifc_count--;
688 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
689 }
690 __in_dev_put(in_dev);
691 }
692
igmp_ifc_event(struct in_device * in_dev)693 static void igmp_ifc_event(struct in_device *in_dev)
694 {
695 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
696 return;
697 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
698 IGMP_Unsolicited_Report_Count;
699 igmp_ifc_start_timer(in_dev, 1);
700 }
701
702
igmp_timer_expire(unsigned long data)703 static void igmp_timer_expire(unsigned long data)
704 {
705 struct ip_mc_list *im=(struct ip_mc_list *)data;
706 struct in_device *in_dev = im->interface;
707
708 spin_lock(&im->lock);
709 im->tm_running=0;
710
711 if (im->unsolicit_count) {
712 im->unsolicit_count--;
713 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
714 }
715 im->reporter = 1;
716 spin_unlock(&im->lock);
717
718 if (IGMP_V1_SEEN(in_dev))
719 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
720 else if (IGMP_V2_SEEN(in_dev))
721 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
722 else
723 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
724
725 ip_ma_put(im);
726 }
727
igmp_marksources(struct ip_mc_list * pmc,int nsrcs,__u32 * srcs)728 static void igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs)
729 {
730 struct ip_sf_list *psf;
731 int i, scount;
732
733 scount = 0;
734 for (psf=pmc->sources; psf; psf=psf->sf_next) {
735 if (scount == nsrcs)
736 break;
737 for (i=0; i<nsrcs; i++)
738 if (srcs[i] == psf->sf_inaddr) {
739 psf->sf_gsresp = 1;
740 scount++;
741 break;
742 }
743 }
744 }
745
igmp_heard_report(struct in_device * in_dev,u32 group)746 static void igmp_heard_report(struct in_device *in_dev, u32 group)
747 {
748 struct ip_mc_list *im;
749
750 /* Timers are only set for non-local groups */
751
752 if (group == IGMP_ALL_HOSTS)
753 return;
754
755 read_lock(&in_dev->lock);
756 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
757 if (im->multiaddr == group) {
758 igmp_stop_timer(im);
759 break;
760 }
761 }
762 read_unlock(&in_dev->lock);
763 }
764
igmp_heard_query(struct in_device * in_dev,struct igmphdr * ih,int len)765 static void igmp_heard_query(struct in_device *in_dev, struct igmphdr *ih,
766 int len)
767 {
768 struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
769 struct ip_mc_list *im;
770 u32 group = ih->group;
771 int max_delay;
772 int mark = 0;
773
774
775 if (len == 8) {
776 if (ih->code == 0) {
777 /* Alas, old v1 router presents here. */
778
779 max_delay = IGMP_Query_Response_Interval;
780 in_dev->mr_v1_seen = jiffies +
781 IGMP_V1_Router_Present_Timeout;
782 group = 0;
783 } else {
784 /* v2 router present */
785 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
786 in_dev->mr_v2_seen = jiffies +
787 IGMP_V2_Router_Present_Timeout;
788 }
789 /* cancel the interface change timer */
790 in_dev->mr_ifc_count = 0;
791 if (del_timer(&in_dev->mr_ifc_timer))
792 __in_dev_put(in_dev);
793 /* clear deleted report items */
794 igmpv3_clear_delrec(in_dev);
795 } else if (len < 12) {
796 return; /* ignore bogus packet; freed by caller */
797 } else { /* v3 */
798 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
799 if (!max_delay)
800 max_delay = 1; /* can't mod w/ 0 */
801 in_dev->mr_maxdelay = max_delay;
802 if (ih3->qrv)
803 in_dev->mr_qrv = ih3->qrv;
804 if (!group) { /* general query */
805 if (ih3->nsrcs)
806 return; /* no sources allowed */
807 igmp_gq_start_timer(in_dev);
808 return;
809 }
810 /* mark sources to include, if group & source-specific */
811 mark = ih3->nsrcs != 0;
812 }
813
814 /*
815 * - Start the timers in all of our membership records
816 * that the query applies to for the interface on
817 * which the query arrived excl. those that belong
818 * to a "local" group (224.0.0.X)
819 * - For timers already running check if they need to
820 * be reset.
821 * - Use the igmp->igmp_code field as the maximum
822 * delay possible
823 */
824 read_lock(&in_dev->lock);
825 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
826 if (group && group != im->multiaddr)
827 continue;
828 if (im->multiaddr == IGMP_ALL_HOSTS)
829 continue;
830 spin_lock_bh(&im->lock);
831 if (im->tm_running)
832 im->gsquery = im->gsquery && mark;
833 else
834 im->gsquery = mark;
835 if (im->gsquery)
836 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
837 spin_unlock_bh(&im->lock);
838 igmp_mod_timer(im, max_delay);
839 }
840 read_unlock(&in_dev->lock);
841 }
842
igmp_rcv(struct sk_buff * skb)843 int igmp_rcv(struct sk_buff *skb)
844 {
845 /* This basically follows the spec line by line -- see RFC1112 */
846 struct igmphdr *ih = skb->h.igmph;
847 struct in_device *in_dev = in_dev_get(skb->dev);
848 int len = skb->len;
849
850 if (in_dev==NULL) {
851 kfree_skb(skb);
852 return 0;
853 }
854
855 if (skb_is_nonlinear(skb)) {
856 if (skb_linearize(skb, GFP_ATOMIC) != 0) {
857 kfree_skb(skb);
858 return -ENOMEM;
859 }
860 ih = skb->h.igmph;
861 }
862
863 if (len < sizeof(struct igmphdr) || ip_compute_csum((void *)ih, len)) {
864 in_dev_put(in_dev);
865 kfree_skb(skb);
866 return 0;
867 }
868
869 switch (ih->type) {
870 case IGMP_HOST_MEMBERSHIP_QUERY:
871 igmp_heard_query(in_dev, ih, len);
872 break;
873 case IGMP_HOST_MEMBERSHIP_REPORT:
874 case IGMPV2_HOST_MEMBERSHIP_REPORT:
875 case IGMPV3_HOST_MEMBERSHIP_REPORT:
876 /* Is it our report looped back? */
877 if (((struct rtable*)skb->dst)->key.iif == 0)
878 break;
879 /* don't rely on MC router hearing unicast reports */
880 if (skb->pkt_type == PACKET_MULTICAST ||
881 skb->pkt_type == PACKET_BROADCAST)
882 igmp_heard_report(in_dev, ih->group);
883 igmp_heard_report(in_dev, ih->group);
884 break;
885 case IGMP_PIM:
886 #ifdef CONFIG_IP_PIMSM_V1
887 in_dev_put(in_dev);
888 return pim_rcv_v1(skb);
889 #endif
890 case IGMP_DVMRP:
891 case IGMP_TRACE:
892 case IGMP_HOST_LEAVE_MESSAGE:
893 case IGMP_MTRACE:
894 case IGMP_MTRACE_RESP:
895 break;
896 default:
897 NETDEBUG(printk(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type));
898 }
899 in_dev_put(in_dev);
900 kfree_skb(skb);
901 return 0;
902 }
903
904 #endif
905
906
907 /*
908 * Add a filter to a device
909 */
910
ip_mc_filter_add(struct in_device * in_dev,u32 addr)911 static void ip_mc_filter_add(struct in_device *in_dev, u32 addr)
912 {
913 char buf[MAX_ADDR_LEN];
914 struct net_device *dev = in_dev->dev;
915
916 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
917 We will get multicast token leakage, when IFF_MULTICAST
918 is changed. This check should be done in dev->set_multicast_list
919 routine. Something sort of:
920 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
921 --ANK
922 */
923 if (arp_mc_map(addr, buf, dev, 0) == 0)
924 dev_mc_add(dev,buf,dev->addr_len,0);
925 }
926
927 /*
928 * Remove a filter from a device
929 */
930
ip_mc_filter_del(struct in_device * in_dev,u32 addr)931 static void ip_mc_filter_del(struct in_device *in_dev, u32 addr)
932 {
933 char buf[MAX_ADDR_LEN];
934 struct net_device *dev = in_dev->dev;
935
936 if (arp_mc_map(addr, buf, dev, 0) == 0)
937 dev_mc_delete(dev,buf,dev->addr_len,0);
938 }
939
940 #ifdef CONFIG_IP_MULTICAST
941 /*
942 * deleted ip_mc_list manipulation
943 */
igmpv3_add_delrec(struct in_device * in_dev,struct ip_mc_list * im)944 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
945 {
946 struct ip_mc_list *pmc;
947
948 /* this is an "ip_mc_list" for convenience; only the fields below
949 * are actually used. In particular, the refcnt and users are not
950 * used for management of the delete list. Using the same structure
951 * for deleted items allows change reports to use common code with
952 * non-deleted or query-response MCA's.
953 */
954 pmc = (struct ip_mc_list *)kmalloc(sizeof(*pmc), GFP_KERNEL);
955 if (!pmc)
956 return;
957 memset(pmc, 0, sizeof(*pmc));
958 spin_lock_bh(&im->lock);
959 pmc->interface = im->interface;
960 in_dev_hold(in_dev);
961 pmc->multiaddr = im->multiaddr;
962 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
963 IGMP_Unsolicited_Report_Count;
964 pmc->sfmode = im->sfmode;
965 if (pmc->sfmode == MCAST_INCLUDE) {
966 struct ip_sf_list *psf;
967
968 pmc->tomb = im->tomb;
969 pmc->sources = im->sources;
970 im->tomb = im->sources = 0;
971 for (psf=pmc->sources; psf; psf=psf->sf_next)
972 psf->sf_crcount = pmc->crcount;
973 }
974 spin_unlock_bh(&im->lock);
975
976 write_lock_bh(&in_dev->mc_lock);
977 pmc->next = in_dev->mc_tomb;
978 in_dev->mc_tomb = pmc;
979 write_unlock_bh(&in_dev->mc_lock);
980 }
981
igmpv3_del_delrec(struct in_device * in_dev,__u32 multiaddr)982 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr)
983 {
984 struct ip_mc_list *pmc, *pmc_prev;
985 struct ip_sf_list *psf, *psf_next;
986
987 write_lock_bh(&in_dev->mc_lock);
988 pmc_prev = 0;
989 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
990 if (pmc->multiaddr == multiaddr)
991 break;
992 pmc_prev = pmc;
993 }
994 if (pmc) {
995 if (pmc_prev)
996 pmc_prev->next = pmc->next;
997 else
998 in_dev->mc_tomb = pmc->next;
999 }
1000 write_unlock_bh(&in_dev->mc_lock);
1001 if (pmc) {
1002 for (psf=pmc->tomb; psf; psf=psf_next) {
1003 psf_next = psf->sf_next;
1004 kfree(psf);
1005 }
1006 in_dev_put(pmc->interface);
1007 kfree(pmc);
1008 }
1009 }
1010
igmpv3_clear_delrec(struct in_device * in_dev)1011 static void igmpv3_clear_delrec(struct in_device *in_dev)
1012 {
1013 struct ip_mc_list *pmc, *nextpmc;
1014
1015 write_lock_bh(&in_dev->mc_lock);
1016 pmc = in_dev->mc_tomb;
1017 in_dev->mc_tomb = 0;
1018 write_unlock_bh(&in_dev->mc_lock);
1019
1020 for (; pmc; pmc = nextpmc) {
1021 nextpmc = pmc->next;
1022 ip_mc_clear_src(pmc);
1023 in_dev_put(pmc->interface);
1024 kfree(pmc);
1025 }
1026 /* clear dead sources, too */
1027 read_lock(&in_dev->lock);
1028 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1029 struct ip_sf_list *psf, *psf_next;
1030
1031 spin_lock_bh(&pmc->lock);
1032 psf = pmc->tomb;
1033 pmc->tomb = 0;
1034 spin_unlock_bh(&pmc->lock);
1035 for (; psf; psf=psf_next) {
1036 psf_next = psf->sf_next;
1037 kfree(psf);
1038 }
1039 }
1040 read_unlock(&in_dev->lock);
1041 }
1042 #endif
1043
igmp_group_dropped(struct ip_mc_list * im)1044 static void igmp_group_dropped(struct ip_mc_list *im)
1045 {
1046 struct in_device *in_dev = im->interface;
1047 #ifdef CONFIG_IP_MULTICAST
1048 int reporter;
1049 #endif
1050
1051 if (im->loaded) {
1052 im->loaded = 0;
1053 ip_mc_filter_del(in_dev, im->multiaddr);
1054 }
1055
1056 #ifdef CONFIG_IP_MULTICAST
1057 if (im->multiaddr == IGMP_ALL_HOSTS)
1058 return;
1059
1060 reporter = im->reporter;
1061 igmp_stop_timer(im);
1062
1063 if (!in_dev->dead) {
1064 if (IGMP_V1_SEEN(in_dev))
1065 goto done;
1066 if (IGMP_V2_SEEN(in_dev)) {
1067 if (reporter)
1068 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1069 goto done;
1070 }
1071 /* IGMPv3 */
1072 igmpv3_add_delrec(in_dev, im);
1073
1074 igmp_ifc_event(in_dev);
1075 }
1076 done:
1077 #endif
1078 ip_mc_clear_src(im);
1079 }
1080
igmp_group_added(struct ip_mc_list * im)1081 static void igmp_group_added(struct ip_mc_list *im)
1082 {
1083 struct in_device *in_dev = im->interface;
1084
1085 if (im->loaded == 0) {
1086 im->loaded = 1;
1087 ip_mc_filter_add(in_dev, im->multiaddr);
1088 }
1089
1090 #ifdef CONFIG_IP_MULTICAST
1091 if (im->multiaddr == IGMP_ALL_HOSTS)
1092 return;
1093
1094 if (in_dev->dead)
1095 return;
1096 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1097 spin_lock_bh(&im->lock);
1098 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1099 spin_unlock_bh(&im->lock);
1100 return;
1101 }
1102 /* else, v3 */
1103
1104 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1105 IGMP_Unsolicited_Report_Count;
1106 igmp_ifc_event(in_dev);
1107 #endif
1108 }
1109
1110
1111 /*
1112 * Multicast list managers
1113 */
1114
1115
1116 /*
1117 * A socket has joined a multicast group on device dev.
1118 */
1119
ip_mc_inc_group(struct in_device * in_dev,u32 addr)1120 void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
1121 {
1122 struct ip_mc_list *im;
1123
1124 ASSERT_RTNL();
1125
1126 for (im=in_dev->mc_list; im; im=im->next) {
1127 if (im->multiaddr == addr) {
1128 im->users++;
1129 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, 0, 0);
1130 goto out;
1131 }
1132 }
1133
1134 im = (struct ip_mc_list *)kmalloc(sizeof(*im), GFP_KERNEL);
1135 if (!im)
1136 goto out;
1137
1138 im->users=1;
1139 im->interface=in_dev;
1140 in_dev_hold(in_dev);
1141 im->multiaddr=addr;
1142 /* initial mode is (EX, empty) */
1143 im->sfmode = MCAST_EXCLUDE;
1144 im->sfcount[MCAST_INCLUDE] = 0;
1145 im->sfcount[MCAST_EXCLUDE] = 1;
1146 im->sources = 0;
1147 im->tomb = 0;
1148 im->crcount = 0;
1149 atomic_set(&im->refcnt, 1);
1150 spin_lock_init(&im->lock);
1151 #ifdef CONFIG_IP_MULTICAST
1152 im->tm_running=0;
1153 init_timer(&im->timer);
1154 im->timer.data=(unsigned long)im;
1155 im->timer.function=&igmp_timer_expire;
1156 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1157 im->reporter = 0;
1158 im->gsquery = 0;
1159 #endif
1160 im->loaded = 0;
1161 write_lock_bh(&in_dev->lock);
1162 im->next=in_dev->mc_list;
1163 in_dev->mc_list=im;
1164 write_unlock_bh(&in_dev->lock);
1165 #ifdef CONFIG_IP_MULTICAST
1166 igmpv3_del_delrec(in_dev, im->multiaddr);
1167 #endif
1168 igmp_group_added(im);
1169 if (!in_dev->dead)
1170 ip_rt_multicast_event(in_dev);
1171 out:
1172 return;
1173 }
1174
1175 /*
1176 * A socket has left a multicast group on device dev
1177 */
1178
ip_mc_dec_group(struct in_device * in_dev,u32 addr)1179 void ip_mc_dec_group(struct in_device *in_dev, u32 addr)
1180 {
1181 struct ip_mc_list *i, **ip;
1182
1183 ASSERT_RTNL();
1184
1185 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1186 if (i->multiaddr==addr) {
1187 if (--i->users == 0) {
1188 write_lock_bh(&in_dev->lock);
1189 *ip = i->next;
1190 write_unlock_bh(&in_dev->lock);
1191 igmp_group_dropped(i);
1192
1193 if (!in_dev->dead)
1194 ip_rt_multicast_event(in_dev);
1195
1196 ip_ma_put(i);
1197 return;
1198 }
1199 break;
1200 }
1201 }
1202 }
1203
1204 /* Device going down */
1205
ip_mc_down(struct in_device * in_dev)1206 void ip_mc_down(struct in_device *in_dev)
1207 {
1208 struct ip_mc_list *i;
1209
1210 ASSERT_RTNL();
1211
1212 for (i=in_dev->mc_list; i; i=i->next)
1213 igmp_group_dropped(i);
1214
1215 #ifdef CONFIG_IP_MULTICAST
1216 in_dev->mr_ifc_count = 0;
1217 if (del_timer(&in_dev->mr_ifc_timer))
1218 __in_dev_put(in_dev);
1219 in_dev->mr_gq_running = 0;
1220 if (del_timer(&in_dev->mr_gq_timer))
1221 __in_dev_put(in_dev);
1222 igmpv3_clear_delrec(in_dev);
1223 #endif
1224
1225 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1226 }
1227
ip_mc_init_dev(struct in_device * in_dev)1228 void ip_mc_init_dev(struct in_device *in_dev)
1229 {
1230 ASSERT_RTNL();
1231
1232 in_dev->mc_tomb = 0;
1233 #ifdef CONFIG_IP_MULTICAST
1234 in_dev->mr_gq_running = 0;
1235 init_timer(&in_dev->mr_gq_timer);
1236 in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1237 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1238 in_dev->mr_ifc_count = 0;
1239 init_timer(&in_dev->mr_ifc_timer);
1240 in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1241 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1242 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1243 #endif
1244
1245 in_dev->mc_lock = RW_LOCK_UNLOCKED;
1246 }
1247
1248 /* Device going up */
1249
ip_mc_up(struct in_device * in_dev)1250 void ip_mc_up(struct in_device *in_dev)
1251 {
1252 struct ip_mc_list *i;
1253
1254 ASSERT_RTNL();
1255
1256 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1257
1258 for (i=in_dev->mc_list; i; i=i->next)
1259 igmp_group_added(i);
1260 }
1261
1262 /*
1263 * Device is about to be destroyed: clean up.
1264 */
1265
ip_mc_destroy_dev(struct in_device * in_dev)1266 void ip_mc_destroy_dev(struct in_device *in_dev)
1267 {
1268 struct ip_mc_list *i;
1269
1270 ASSERT_RTNL();
1271
1272 /* Deactivate timers */
1273 ip_mc_down(in_dev);
1274
1275 write_lock_bh(&in_dev->lock);
1276 while ((i = in_dev->mc_list) != NULL) {
1277 in_dev->mc_list = i->next;
1278 write_unlock_bh(&in_dev->lock);
1279
1280 igmp_group_dropped(i);
1281 ip_ma_put(i);
1282
1283 write_lock_bh(&in_dev->lock);
1284 }
1285 write_unlock_bh(&in_dev->lock);
1286 }
1287
ip_mc_find_dev(struct ip_mreqn * imr)1288 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1289 {
1290 struct rtable *rt;
1291 struct net_device *dev = NULL;
1292 struct in_device *idev = NULL;
1293
1294 if (imr->imr_ifindex) {
1295 idev = inetdev_by_index(imr->imr_ifindex);
1296 if (idev)
1297 __in_dev_put(idev);
1298 return idev;
1299 }
1300 if (imr->imr_address.s_addr) {
1301 dev = ip_dev_find(imr->imr_address.s_addr);
1302 if (!dev)
1303 return NULL;
1304 __dev_put(dev);
1305 }
1306
1307 if (!dev && !ip_route_output(&rt, imr->imr_multiaddr.s_addr, 0, 0, 0)) {
1308 dev = rt->u.dst.dev;
1309 ip_rt_put(rt);
1310 }
1311 if (dev) {
1312 imr->imr_ifindex = dev->ifindex;
1313 idev = __in_dev_get(dev);
1314 }
1315 return idev;
1316 }
1317
1318 /*
1319 * Join a socket to a group
1320 */
1321 int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS;
1322 int sysctl_igmp_max_msf = IP_MAX_MSF;
1323
1324
ip_mc_del1_src(struct ip_mc_list * pmc,int sfmode,__u32 * psfsrc)1325 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1326 __u32 *psfsrc)
1327 {
1328 struct ip_sf_list *psf, *psf_prev;
1329 int rv = 0;
1330
1331 psf_prev = 0;
1332 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1333 if (psf->sf_inaddr == *psfsrc)
1334 break;
1335 psf_prev = psf;
1336 }
1337 if (!psf || psf->sf_count[sfmode] == 0) {
1338 /* source filter not found, or count wrong => bug */
1339 return -ESRCH;
1340 }
1341 psf->sf_count[sfmode]--;
1342 if (psf->sf_count[sfmode] == 0) {
1343 ip_rt_multicast_event(pmc->interface);
1344 }
1345 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1346 #ifdef CONFIG_IP_MULTICAST
1347 struct in_device *in_dev = pmc->interface;
1348 #endif
1349
1350 /* no more filters for this source */
1351 if (psf_prev)
1352 psf_prev->sf_next = psf->sf_next;
1353 else
1354 pmc->sources = psf->sf_next;
1355 #ifdef CONFIG_IP_MULTICAST
1356 if (psf->sf_oldin &&
1357 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1358 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1359 IGMP_Unsolicited_Report_Count;
1360 psf->sf_next = pmc->tomb;
1361 pmc->tomb = psf;
1362 rv = 1;
1363 } else
1364 #endif
1365 kfree(psf);
1366 }
1367 return rv;
1368 }
1369
ip_mc_del_src(struct in_device * in_dev,__u32 * pmca,int sfmode,int sfcount,__u32 * psfsrc,int delta)1370 int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1371 int sfcount, __u32 *psfsrc, int delta)
1372 {
1373 struct ip_mc_list *pmc;
1374 int changerec = 0;
1375 int i, err;
1376
1377 if (!in_dev)
1378 return -ENODEV;
1379 read_lock(&in_dev->lock);
1380 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1381 if (*pmca == pmc->multiaddr)
1382 break;
1383 }
1384 if (!pmc) {
1385 /* MCA not found?? bug */
1386 read_unlock(&in_dev->lock);
1387 return -ESRCH;
1388 }
1389 spin_lock_bh(&pmc->lock);
1390 read_unlock(&in_dev->lock);
1391 #ifdef CONFIG_IP_MULTICAST
1392 sf_markstate(pmc);
1393 #endif
1394 if (!delta) {
1395 err = -EINVAL;
1396 if (!pmc->sfcount[sfmode])
1397 goto out_unlock;
1398 pmc->sfcount[sfmode]--;
1399 }
1400 err = 0;
1401 for (i=0; i<sfcount; i++) {
1402 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1403
1404 changerec |= rv > 0;
1405 if (!err && rv < 0)
1406 err = rv;
1407 }
1408 if (pmc->sfmode == MCAST_EXCLUDE &&
1409 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1410 pmc->sfcount[MCAST_INCLUDE]) {
1411 #ifdef CONFIG_IP_MULTICAST
1412 struct ip_sf_list *psf;
1413 #endif
1414
1415 /* filter mode change */
1416 pmc->sfmode = MCAST_INCLUDE;
1417 #ifdef CONFIG_IP_MULTICAST
1418 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1419 IGMP_Unsolicited_Report_Count;
1420 in_dev->mr_ifc_count = pmc->crcount;
1421 for (psf=pmc->sources; psf; psf = psf->sf_next)
1422 psf->sf_crcount = 0;
1423 igmp_ifc_event(pmc->interface);
1424 } else if (sf_setstate(pmc) || changerec) {
1425 igmp_ifc_event(pmc->interface);
1426 #endif
1427 }
1428 out_unlock:
1429 spin_unlock_bh(&pmc->lock);
1430 return err;
1431 }
1432
1433 /*
1434 * Add multicast single-source filter to the interface list
1435 */
ip_mc_add1_src(struct ip_mc_list * pmc,int sfmode,__u32 * psfsrc,int delta)1436 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1437 __u32 *psfsrc, int delta)
1438 {
1439 struct ip_sf_list *psf, *psf_prev;
1440
1441 psf_prev = 0;
1442 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1443 if (psf->sf_inaddr == *psfsrc)
1444 break;
1445 psf_prev = psf;
1446 }
1447 if (!psf) {
1448 psf = (struct ip_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1449 if (!psf)
1450 return -ENOBUFS;
1451 memset(psf, 0, sizeof(*psf));
1452 psf->sf_inaddr = *psfsrc;
1453 if (psf_prev) {
1454 psf_prev->sf_next = psf;
1455 } else
1456 pmc->sources = psf;
1457 }
1458 psf->sf_count[sfmode]++;
1459 if (psf->sf_count[sfmode] == 1) {
1460 ip_rt_multicast_event(pmc->interface);
1461 }
1462 return 0;
1463 }
1464
1465 #ifdef CONFIG_IP_MULTICAST
sf_markstate(struct ip_mc_list * pmc)1466 static void sf_markstate(struct ip_mc_list *pmc)
1467 {
1468 struct ip_sf_list *psf;
1469 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1470
1471 for (psf=pmc->sources; psf; psf=psf->sf_next)
1472 if (pmc->sfcount[MCAST_EXCLUDE]) {
1473 psf->sf_oldin = mca_xcount ==
1474 psf->sf_count[MCAST_EXCLUDE] &&
1475 !psf->sf_count[MCAST_INCLUDE];
1476 } else
1477 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1478 }
1479
sf_setstate(struct ip_mc_list * pmc)1480 static int sf_setstate(struct ip_mc_list *pmc)
1481 {
1482 struct ip_sf_list *psf;
1483 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1484 int qrv = pmc->interface->mr_qrv;
1485 int new_in, rv;
1486
1487 rv = 0;
1488 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1489 if (pmc->sfcount[MCAST_EXCLUDE]) {
1490 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1491 !psf->sf_count[MCAST_INCLUDE];
1492 } else
1493 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1494 if (new_in != psf->sf_oldin) {
1495 psf->sf_crcount = qrv;
1496 rv++;
1497 }
1498 }
1499 return rv;
1500 }
1501 #endif
1502
1503 /*
1504 * Add multicast source filter list to the interface list
1505 */
ip_mc_add_src(struct in_device * in_dev,__u32 * pmca,int sfmode,int sfcount,__u32 * psfsrc,int delta)1506 int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1507 int sfcount, __u32 *psfsrc, int delta)
1508 {
1509 struct ip_mc_list *pmc;
1510 int isexclude;
1511 int i, err;
1512
1513 if (!in_dev)
1514 return -ENODEV;
1515 read_lock(&in_dev->lock);
1516 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1517 if (*pmca == pmc->multiaddr)
1518 break;
1519 }
1520 if (!pmc) {
1521 /* MCA not found?? bug */
1522 read_unlock(&in_dev->lock);
1523 return -ESRCH;
1524 }
1525 spin_lock_bh(&pmc->lock);
1526 read_unlock(&in_dev->lock);
1527
1528 #ifdef CONFIG_IP_MULTICAST
1529 sf_markstate(pmc);
1530 #endif
1531 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1532 if (!delta)
1533 pmc->sfcount[sfmode]++;
1534 err = 0;
1535 for (i=0; i<sfcount; i++) {
1536 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1537 if (err)
1538 break;
1539 }
1540 if (err) {
1541 int j;
1542
1543 pmc->sfcount[sfmode]--;
1544 for (j=0; j<i; j++)
1545 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1546 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1547 #ifdef CONFIG_IP_MULTICAST
1548 struct in_device *in_dev = pmc->interface;
1549 struct ip_sf_list *psf;
1550 #endif
1551
1552 /* filter mode change */
1553 if (pmc->sfcount[MCAST_EXCLUDE])
1554 pmc->sfmode = MCAST_EXCLUDE;
1555 else if (pmc->sfcount[MCAST_INCLUDE])
1556 pmc->sfmode = MCAST_INCLUDE;
1557 #ifdef CONFIG_IP_MULTICAST
1558 /* else no filters; keep old mode for reports */
1559
1560 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1561 IGMP_Unsolicited_Report_Count;
1562 in_dev->mr_ifc_count = pmc->crcount;
1563 for (psf=pmc->sources; psf; psf = psf->sf_next)
1564 psf->sf_crcount = 0;
1565 igmp_ifc_event(in_dev);
1566 } else if (sf_setstate(pmc)) {
1567 igmp_ifc_event(in_dev);
1568 #endif
1569 }
1570 spin_unlock_bh(&pmc->lock);
1571 return err;
1572 }
1573
ip_mc_clear_src(struct ip_mc_list * pmc)1574 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1575 {
1576 struct ip_sf_list *psf, *nextpsf;
1577
1578 for (psf=pmc->tomb; psf; psf=nextpsf) {
1579 nextpsf = psf->sf_next;
1580 kfree(psf);
1581 }
1582 pmc->tomb = 0;
1583 for (psf=pmc->sources; psf; psf=nextpsf) {
1584 nextpsf = psf->sf_next;
1585 kfree(psf);
1586 }
1587 pmc->sources = 0;
1588 pmc->sfmode = MCAST_EXCLUDE;
1589 pmc->sfcount[MCAST_INCLUDE] = 0;
1590 pmc->sfcount[MCAST_EXCLUDE] = 1;
1591 }
1592
1593
1594 /*
1595 * Join a multicast group
1596 */
ip_mc_join_group(struct sock * sk,struct ip_mreqn * imr)1597 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1598 {
1599 int err;
1600 u32 addr = imr->imr_multiaddr.s_addr;
1601 struct ip_mc_socklist *iml, *i;
1602 struct in_device *in_dev;
1603 struct inet_opt *inet = &sk->protinfo.af_inet;
1604 int count = 0;
1605
1606 if (!MULTICAST(addr))
1607 return -EINVAL;
1608
1609 rtnl_shlock();
1610
1611 in_dev = ip_mc_find_dev(imr);
1612
1613 if (!in_dev) {
1614 iml = NULL;
1615 err = -ENODEV;
1616 goto done;
1617 }
1618
1619 iml = (struct ip_mc_socklist *)sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1620
1621 err = -EADDRINUSE;
1622 for (i = inet->mc_list; i; i = i->next) {
1623 if (memcmp(&i->multi, imr, sizeof(*imr)) == 0) {
1624 /* New style additions are reference counted */
1625 if (imr->imr_address.s_addr == 0) {
1626 i->count++;
1627 err = 0;
1628 }
1629 goto done;
1630 }
1631 count++;
1632 }
1633 err = -ENOBUFS;
1634 if (iml == NULL || count >= sysctl_igmp_max_memberships)
1635 goto done;
1636 memcpy(&iml->multi, imr, sizeof(*imr));
1637 iml->next = sk->protinfo.af_inet.mc_list;
1638 iml->count = 1;
1639 iml->sflist = NULL;
1640 iml->sfmode = MCAST_EXCLUDE;
1641 inet->mc_list = iml;
1642 ip_mc_inc_group(in_dev, addr);
1643 iml = NULL;
1644 err = 0;
1645
1646 done:
1647 rtnl_shunlock();
1648 if (iml)
1649 sock_kfree_s(sk, iml, sizeof(*iml));
1650 return err;
1651 }
1652
ip_mc_leave_src(struct sock * sk,struct ip_mc_socklist * iml,struct in_device * in_dev)1653 int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1654 struct in_device *in_dev)
1655 {
1656 int err;
1657
1658 if (iml->sflist == 0) {
1659 /* any-source empty exclude case */
1660 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1661 iml->sfmode, 0, 0, 0);
1662 }
1663 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1664 iml->sfmode, iml->sflist->sl_count,
1665 iml->sflist->sl_addr, 0);
1666 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1667 iml->sflist = 0;
1668 return err;
1669 }
1670
1671 /*
1672 * Ask a socket to leave a group.
1673 */
1674
ip_mc_leave_group(struct sock * sk,struct ip_mreqn * imr)1675 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1676 {
1677 struct inet_opt *inet = &sk->protinfo.af_inet;
1678 struct ip_mc_socklist *iml, **imlp;
1679
1680 rtnl_lock();
1681 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1682 if (iml->multi.imr_multiaddr.s_addr==imr->imr_multiaddr.s_addr &&
1683 iml->multi.imr_address.s_addr==imr->imr_address.s_addr &&
1684 (!imr->imr_ifindex || iml->multi.imr_ifindex==imr->imr_ifindex)) {
1685 struct in_device *in_dev;
1686
1687 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
1688 if (in_dev)
1689 (void) ip_mc_leave_src(sk, iml, in_dev);
1690 if (--iml->count) {
1691 rtnl_unlock();
1692 if (in_dev)
1693 in_dev_put(in_dev);
1694 return 0;
1695 }
1696
1697 *imlp = iml->next;
1698
1699 if (in_dev) {
1700 ip_mc_dec_group(in_dev, imr->imr_multiaddr.s_addr);
1701 in_dev_put(in_dev);
1702 }
1703 rtnl_unlock();
1704 sock_kfree_s(sk, iml, sizeof(*iml));
1705 return 0;
1706 }
1707 }
1708 rtnl_unlock();
1709 return -EADDRNOTAVAIL;
1710 }
1711
ip_mc_source(int add,int omode,struct sock * sk,struct ip_mreq_source * mreqs,int ifindex)1712 int ip_mc_source(int add, int omode, struct sock *sk, struct
1713 ip_mreq_source *mreqs, int ifindex)
1714 {
1715 int err;
1716 struct ip_mreqn imr;
1717 u32 addr = mreqs->imr_multiaddr;
1718 struct ip_mc_socklist *pmc;
1719 struct in_device *in_dev = 0;
1720 struct inet_opt *inet = &sk->protinfo.af_inet;
1721 struct ip_sf_socklist *psl;
1722 int i, j, rv;
1723
1724 if (!MULTICAST(addr))
1725 return -EINVAL;
1726
1727 rtnl_shlock();
1728
1729 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1730 imr.imr_address.s_addr = mreqs->imr_interface;
1731 imr.imr_ifindex = ifindex;
1732 in_dev = ip_mc_find_dev(&imr);
1733
1734 if (!in_dev) {
1735 err = -ENODEV;
1736 goto done;
1737 }
1738 err = -EADDRNOTAVAIL;
1739
1740 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1741 if (memcmp(&pmc->multi, mreqs, 2*sizeof(__u32)) == 0)
1742 break;
1743 }
1744 if (!pmc) /* must have a prior join */
1745 goto done;
1746 /* if a source filter was set, must be the same mode as before */
1747 if (pmc->sflist) {
1748 if (pmc->sfmode != omode)
1749 goto done;
1750 } else if (pmc->sfmode != omode) {
1751 /* allow mode switches for empty-set filters */
1752 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, 0, 0);
1753 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1754 0, 0);
1755 pmc->sfmode = omode;
1756 }
1757
1758 psl = pmc->sflist;
1759 if (!add) {
1760 if (!psl)
1761 goto done;
1762 rv = !0;
1763 for (i=0; i<psl->sl_count; i++) {
1764 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1765 sizeof(__u32));
1766 if (rv == 0)
1767 break;
1768 }
1769 if (rv) /* source not found */
1770 goto done;
1771
1772 /* update the interface filter */
1773 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1774 &mreqs->imr_sourceaddr, 1);
1775
1776 for (j=i+1; j<psl->sl_count; j++)
1777 psl->sl_addr[j-1] = psl->sl_addr[j];
1778 psl->sl_count--;
1779 err = 0;
1780 goto done;
1781 }
1782 /* else, add a new source to the filter */
1783
1784 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1785 err = -ENOBUFS;
1786 goto done;
1787 }
1788 if (!psl || psl->sl_count == psl->sl_max) {
1789 struct ip_sf_socklist *newpsl;
1790 int count = IP_SFBLOCK;
1791
1792 if (psl)
1793 count += psl->sl_max;
1794 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk,
1795 IP_SFLSIZE(count), GFP_KERNEL);
1796 if (!newpsl) {
1797 err = -ENOBUFS;
1798 goto done;
1799 }
1800 newpsl->sl_max = count;
1801 newpsl->sl_count = count - IP_SFBLOCK;
1802 if (psl) {
1803 for (i=0; i<psl->sl_count; i++)
1804 newpsl->sl_addr[i] = psl->sl_addr[i];
1805 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1806 }
1807 pmc->sflist = psl = newpsl;
1808 }
1809 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1810 for (i=0; i<psl->sl_count; i++) {
1811 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1812 sizeof(__u32));
1813 if (rv == 0)
1814 break;
1815 }
1816 if (rv == 0) /* address already there is an error */
1817 goto done;
1818 for (j=psl->sl_count-1; j>=i; j--)
1819 psl->sl_addr[j+1] = psl->sl_addr[j];
1820 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1821 psl->sl_count++;
1822 err = 0;
1823 /* update the interface list */
1824 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1825 &mreqs->imr_sourceaddr, 1);
1826 done:
1827 rtnl_shunlock();
1828 return err;
1829 }
1830
ip_mc_msfilter(struct sock * sk,struct ip_msfilter * msf,int ifindex)1831 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1832 {
1833 int err;
1834 struct ip_mreqn imr;
1835 u32 addr = msf->imsf_multiaddr;
1836 struct ip_mc_socklist *pmc;
1837 struct in_device *in_dev;
1838 struct inet_opt *inet = &sk->protinfo.af_inet;
1839 struct ip_sf_socklist *newpsl, *psl;
1840
1841 if (!MULTICAST(addr))
1842 return -EINVAL;
1843 if (msf->imsf_fmode != MCAST_INCLUDE &&
1844 msf->imsf_fmode != MCAST_EXCLUDE)
1845 return -EINVAL;
1846
1847 rtnl_shlock();
1848
1849 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1850 imr.imr_address.s_addr = msf->imsf_interface;
1851 imr.imr_ifindex = ifindex;
1852 in_dev = ip_mc_find_dev(&imr);
1853
1854 if (!in_dev) {
1855 err = -ENODEV;
1856 goto done;
1857 }
1858 err = -EADDRNOTAVAIL;
1859
1860 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1861 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1862 pmc->multi.imr_ifindex == imr.imr_ifindex)
1863 break;
1864 }
1865 if (!pmc) /* must have a prior join */
1866 goto done;
1867 if (msf->imsf_numsrc) {
1868 newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk,
1869 IP_SFLSIZE(msf->imsf_numsrc), GFP_KERNEL);
1870 if (!newpsl) {
1871 err = -ENOBUFS;
1872 goto done;
1873 }
1874 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
1875 memcpy(newpsl->sl_addr, msf->imsf_slist,
1876 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
1877 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1878 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
1879 if (err) {
1880 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
1881 goto done;
1882 }
1883 } else {
1884 newpsl = NULL;
1885 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1886 msf->imsf_fmode, 0, NULL, 0);
1887 }
1888 psl = pmc->sflist;
1889 if (psl) {
1890 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1891 psl->sl_count, psl->sl_addr, 0);
1892 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1893 } else
1894 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1895 0, 0, 0);
1896 pmc->sflist = newpsl;
1897 pmc->sfmode = msf->imsf_fmode;
1898 done:
1899 rtnl_shunlock();
1900 return err;
1901 }
1902
ip_mc_msfget(struct sock * sk,struct ip_msfilter * msf,struct ip_msfilter * optval,int * optlen)1903 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
1904 struct ip_msfilter *optval, int *optlen)
1905 {
1906 int err, len, count, copycount;
1907 struct ip_mreqn imr;
1908 u32 addr = msf->imsf_multiaddr;
1909 struct ip_mc_socklist *pmc;
1910 struct in_device *in_dev;
1911 struct inet_opt *inet = &sk->protinfo.af_inet;
1912 struct ip_sf_socklist *psl;
1913
1914 if (!MULTICAST(addr))
1915 return -EINVAL;
1916
1917 rtnl_shlock();
1918
1919 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1920 imr.imr_address.s_addr = msf->imsf_interface;
1921 imr.imr_ifindex = 0;
1922 in_dev = ip_mc_find_dev(&imr);
1923
1924 if (!in_dev) {
1925 err = -ENODEV;
1926 goto done;
1927 }
1928 err = -EADDRNOTAVAIL;
1929
1930 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1931 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1932 pmc->multi.imr_ifindex == imr.imr_ifindex)
1933 break;
1934 }
1935 if (!pmc) /* must have a prior join */
1936 goto done;
1937 msf->imsf_fmode = pmc->sfmode;
1938 psl = pmc->sflist;
1939 rtnl_shunlock();
1940 if (!psl) {
1941 len = 0;
1942 count = 0;
1943 } else {
1944 count = psl->sl_count;
1945 }
1946 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
1947 len = copycount * sizeof(psl->sl_addr[0]);
1948 msf->imsf_numsrc = count;
1949 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
1950 copy_to_user((void *)optval, msf, IP_MSFILTER_SIZE(0))) {
1951 return -EFAULT;
1952 }
1953 if (len &&
1954 copy_to_user((void *)&optval->imsf_slist[0], psl->sl_addr, len))
1955 return -EFAULT;
1956 return 0;
1957 done:
1958 rtnl_shunlock();
1959 return err;
1960 }
1961
ip_mc_gsfget(struct sock * sk,struct group_filter * gsf,struct group_filter * optval,int * optlen)1962 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
1963 struct group_filter *optval, int *optlen)
1964 {
1965 int err, i, count, copycount;
1966 struct sockaddr_in *psin;
1967 u32 addr;
1968 struct ip_mc_socklist *pmc;
1969 struct inet_opt *inet = &sk->protinfo.af_inet;
1970 struct ip_sf_socklist *psl;
1971
1972 psin = (struct sockaddr_in *)&gsf->gf_group;
1973 if (psin->sin_family != AF_INET)
1974 return -EINVAL;
1975 addr = psin->sin_addr.s_addr;
1976 if (!MULTICAST(addr))
1977 return -EINVAL;
1978
1979 rtnl_shlock();
1980
1981 err = -EADDRNOTAVAIL;
1982
1983 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1984 if (pmc->multi.imr_multiaddr.s_addr == addr &&
1985 pmc->multi.imr_ifindex == gsf->gf_interface)
1986 break;
1987 }
1988 if (!pmc) /* must have a prior join */
1989 goto done;
1990 gsf->gf_fmode = pmc->sfmode;
1991 psl = pmc->sflist;
1992 rtnl_shunlock();
1993 count = psl ? psl->sl_count : 0;
1994 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
1995 gsf->gf_numsrc = count;
1996 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
1997 copy_to_user((void *)optval, gsf, GROUP_FILTER_SIZE(0))) {
1998 return -EFAULT;
1999 }
2000 for (i=0; i<copycount; i++) {
2001 struct sockaddr_in *psin;
2002 struct sockaddr_storage ss;
2003
2004 psin = (struct sockaddr_in *)&ss;
2005 memset(&ss, 0, sizeof(ss));
2006 psin->sin_family = AF_INET;
2007 psin->sin_addr.s_addr = psl->sl_addr[i];
2008 if (copy_to_user((void *)&optval->gf_slist[i], &ss, sizeof(ss)))
2009 return -EFAULT;
2010 }
2011 return 0;
2012 done:
2013 rtnl_shunlock();
2014 return err;
2015 }
2016
2017 /*
2018 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2019 */
ip_mc_sf_allow(struct sock * sk,u32 loc_addr,u32 rmt_addr,int dif)2020 int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
2021 {
2022 struct inet_opt *inet = &sk->protinfo.af_inet;
2023 struct ip_mc_socklist *pmc;
2024 struct ip_sf_socklist *psl;
2025 int i;
2026
2027 if (!MULTICAST(loc_addr))
2028 return 1;
2029
2030 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2031 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2032 pmc->multi.imr_ifindex == dif)
2033 break;
2034 }
2035 if (!pmc)
2036 return 1;
2037 psl = pmc->sflist;
2038 if (!psl)
2039 return pmc->sfmode == MCAST_EXCLUDE;
2040
2041 for (i=0; i<psl->sl_count; i++) {
2042 if (psl->sl_addr[i] == rmt_addr)
2043 break;
2044 }
2045 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2046 return 0;
2047 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2048 return 0;
2049 return 1;
2050 }
2051
2052 /*
2053 * A socket is closing.
2054 */
2055
ip_mc_drop_socket(struct sock * sk)2056 void ip_mc_drop_socket(struct sock *sk)
2057 {
2058 struct inet_opt *inet = &sk->protinfo.af_inet;
2059 struct ip_mc_socklist *iml;
2060
2061 if (inet->mc_list == NULL)
2062 return;
2063
2064 rtnl_lock();
2065 while ((iml = inet->mc_list) != NULL) {
2066 struct in_device *in_dev;
2067 inet->mc_list = iml->next;
2068
2069 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) {
2070 (void) ip_mc_leave_src(sk, iml, in_dev);
2071 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2072 in_dev_put(in_dev);
2073 }
2074 sock_kfree_s(sk, iml, sizeof(*iml));
2075
2076 }
2077 rtnl_unlock();
2078 }
2079
ip_check_mc(struct in_device * in_dev,u32 mc_addr,u32 src_addr)2080 int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr)
2081 {
2082 struct ip_mc_list *im;
2083 struct ip_sf_list *psf;
2084 int rv = 0;
2085
2086 read_lock(&in_dev->lock);
2087 for (im=in_dev->mc_list; im; im=im->next) {
2088 if (im->multiaddr == mc_addr)
2089 break;
2090 }
2091 /*
2092 * This should check the protocol and allow all IGMP packets
2093 * here, but it isn't available in the call from ip_route_output()
2094 * in 2.4.x. It shouldn't actually matter, since groups joined
2095 * from within the kernel will have an {exclude, empty} filter.
2096 * Differs from 2.5.x here. +-DLS 4/23/03
2097 */
2098 if (im) {
2099 if (src_addr) {
2100 for (psf=im->sources; psf; psf=psf->sf_next) {
2101 if (psf->sf_inaddr == src_addr)
2102 break;
2103 }
2104 if (psf)
2105 rv = psf->sf_count[MCAST_INCLUDE] ||
2106 psf->sf_count[MCAST_EXCLUDE] !=
2107 im->sfcount[MCAST_EXCLUDE];
2108 else
2109 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2110 } else
2111 rv = 1;
2112 }
2113 read_unlock(&in_dev->lock);
2114 return rv;
2115 }
2116
2117
ip_mc_procinfo(char * buffer,char ** start,off_t offset,int length)2118 int ip_mc_procinfo(char *buffer, char **start, off_t offset, int length)
2119 {
2120 off_t pos=0, begin=0;
2121 struct ip_mc_list *im;
2122 int len=0;
2123 struct net_device *dev;
2124
2125 len=sprintf(buffer,"Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2126
2127 read_lock(&dev_base_lock);
2128 for(dev = dev_base; dev; dev = dev->next) {
2129 struct in_device *in_dev = in_dev_get(dev);
2130 char *querier = "NONE";
2131
2132 if (in_dev == NULL)
2133 continue;
2134
2135 #ifdef CONFIG_IP_MULTICAST
2136 querier = IGMP_V1_SEEN(in_dev) ? "V1" : IGMP_V2_SEEN(in_dev) ?
2137 "V2" : "V3";
2138 #endif
2139
2140 len+=sprintf(buffer+len,"%d\t%-10s: %5d %7s\n",
2141 dev->ifindex, dev->name, dev->mc_count, querier);
2142
2143 read_lock(&in_dev->lock);
2144 for (im = in_dev->mc_list; im; im = im->next) {
2145 len+=sprintf(buffer+len,
2146 "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n",
2147 im->multiaddr, im->users,
2148 im->tm_running, im->tm_running ?
2149 im->timer.expires-jiffies : 0,
2150 im->reporter);
2151
2152 pos=begin+len;
2153 if(pos<offset)
2154 {
2155 len=0;
2156 begin=pos;
2157 }
2158 if(pos>offset+length) {
2159 read_unlock(&in_dev->lock);
2160 in_dev_put(in_dev);
2161 goto done;
2162 }
2163 }
2164 read_unlock(&in_dev->lock);
2165 in_dev_put(in_dev);
2166 }
2167 done:
2168 read_unlock(&dev_base_lock);
2169
2170 *start=buffer+(offset-begin);
2171 len-=(offset-begin);
2172 if(len>length)
2173 len=length;
2174 if(len<0)
2175 len=0;
2176 return len;
2177 }
2178
ip_mcf_procinfo(char * buffer,char ** start,off_t offset,int length)2179 int ip_mcf_procinfo(char *buffer, char **start, off_t offset, int length)
2180 {
2181 off_t pos=0, begin=0;
2182 int len=0;
2183 int first = 1;
2184 struct net_device *dev;
2185
2186 read_lock(&dev_base_lock);
2187 for(dev=dev_base; dev; dev=dev->next) {
2188 struct in_device *in_dev = in_dev_get(dev);
2189 struct ip_mc_list *imc;
2190
2191 if (in_dev == NULL)
2192 continue;
2193
2194 read_lock(&in_dev->lock);
2195
2196 for (imc=in_dev->mc_list; imc; imc=imc->next) {
2197 struct ip_sf_list *psf;
2198
2199 spin_lock_bh(&imc->lock);
2200 for (psf=imc->sources; psf; psf=psf->sf_next) {
2201 if (first) {
2202 len += sprintf(buffer+len, "%3s %6s "
2203 "%10s %10s %6s %6s\n", "Idx",
2204 "Device", "MCA", "SRC", "INC",
2205 "EXC");
2206 first = 0;
2207 }
2208 len += sprintf(buffer+len, "%3d %6.6s 0x%08x "
2209 "0x%08x %6lu %6lu\n", dev->ifindex,
2210 dev->name, ntohl(imc->multiaddr),
2211 ntohl(psf->sf_inaddr),
2212 psf->sf_count[MCAST_INCLUDE],
2213 psf->sf_count[MCAST_EXCLUDE]);
2214 pos=begin+len;
2215 if(pos<offset)
2216 {
2217 len=0;
2218 begin=pos;
2219 }
2220 if(pos>offset+length) {
2221 spin_unlock_bh(&imc->lock);
2222 read_unlock(&in_dev->lock);
2223 in_dev_put(in_dev);
2224 goto done;
2225 }
2226 }
2227 spin_unlock_bh(&imc->lock);
2228 }
2229 read_unlock(&in_dev->lock);
2230 in_dev_put(in_dev);
2231 }
2232 done:
2233 read_unlock(&dev_base_lock);
2234
2235 *start=buffer+(offset-begin);
2236 len-=(offset-begin);
2237 if(len>length)
2238 len=length;
2239 if(len<0)
2240 len=0;
2241 return len;
2242 }
2243
2244