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scripts/gdb: define maintainer
[linux/fpc-iii.git] / net / ipv4 / igmp.c
blob666cf364df86dffbab3cd2b7b1ea66e72d3ac7a8
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 * Authors:
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 * Fixes:
20 *
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
23 * functions.
24 * Alan Cox : Dumped the header building experiment.
25 * Alan Cox : Minor tweaks ready for multicast routing
26 * and extended IGMP protocol.
27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
28 * writes utterly bogus code otherwise (sigh)
29 * fixed IGMP loopback to behave in the manner
30 * desired by mrouted, fixed the fact it has been
31 * broken since 1.3.6 and cleaned up a few minor
32 * points.
33 *
34 * Chih-Jen Chang : Tried to revise IGMP to Version 2
35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
36 * The enhancements are mainly based on Steve Deering's
37 * ipmulti-3.5 source code.
38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
40 * the mrouted version on that device.
41 * Chih-Jen Chang : Added the max_resp_time parameter to
42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
43 * to identify the multicast router version
44 * and do what the IGMP version 2 specified.
45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
46 * Tsu-Sheng Tsao if the specified time expired.
47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
48 * Alan Cox : Use GFP_ATOMIC in the right places.
49 * Christian Daudt : igmp timer wasn't set for local group
50 * memberships but was being deleted,
51 * which caused a "del_timer() called
52 * from %p with timer not initialized\n"
53 * message (960131).
54 * Christian Daudt : removed del_timer from
55 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
58 * true (960216).
59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
60 * igmp_heard_query never trigger. Expiry
61 * miscalculation fixed in igmp_heard_query
62 * and random() made to return unsigned to
63 * prevent negative expiry times.
64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
65 * fix from pending 2.1.x patches.
66 * Alan Cox: Forget to enable FDDI support earlier.
67 * Alexey Kuznetsov: Fixed leaving groups on device down.
68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
69 * David L Stevens: IGMPv3 support, with help from
70 * Vinay Kulkarni
71 */
72
73 #include <linux/module.h>
74 #include <linux/slab.h>
75 #include <asm/uaccess.h>
76 #include <linux/types.h>
77 #include <linux/kernel.h>
78 #include <linux/jiffies.h>
79 #include <linux/string.h>
80 #include <linux/socket.h>
81 #include <linux/sockios.h>
82 #include <linux/in.h>
83 #include <linux/inet.h>
84 #include <linux/netdevice.h>
85 #include <linux/skbuff.h>
86 #include <linux/inetdevice.h>
87 #include <linux/igmp.h>
88 #include <linux/if_arp.h>
89 #include <linux/rtnetlink.h>
90 #include <linux/times.h>
91 #include <linux/pkt_sched.h>
92
93 #include <net/net_namespace.h>
94 #include <net/arp.h>
95 #include <net/ip.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
98 #include <net/sock.h>
99 #include <net/checksum.h>
100 #include <linux/netfilter_ipv4.h>
101 #ifdef CONFIG_IP_MROUTE
102 #include <linux/mroute.h>
103 #endif
104 #ifdef CONFIG_PROC_FS
105 #include <linux/proc_fs.h>
106 #include <linux/seq_file.h>
107 #endif
108
109 #define IP_MAX_MEMBERSHIPS 20
110 #define IP_MAX_MSF 10
111
112 #ifdef CONFIG_IP_MULTICAST
113 /* Parameter names and values are taken from igmp-v2-06 draft */
114
115 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
116 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
117 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
118 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
119 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
120 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 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(dev_net(in_dev->dev), 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(dev_net(in_dev->dev), 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 int unsolicited_report_interval(struct in_device *in_dev)
144 {
145 int interval_ms, interval_jiffies;
146
147 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
148 interval_ms = IN_DEV_CONF_GET(
149 in_dev,
150 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
151 else /* v3 */
152 interval_ms = IN_DEV_CONF_GET(
153 in_dev,
154 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
155
156 interval_jiffies = msecs_to_jiffies(interval_ms);
157
158 /* _timer functions can't handle a delay of 0 jiffies so ensure
159 * we always return a positive value.
160 */
161 if (interval_jiffies <= 0)
162 interval_jiffies = 1;
163 return interval_jiffies;
164 }
165
166 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
167 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
168 static void igmpv3_clear_delrec(struct in_device *in_dev);
169 static int sf_setstate(struct ip_mc_list *pmc);
170 static void sf_markstate(struct ip_mc_list *pmc);
171 #endif
172 static void ip_mc_clear_src(struct ip_mc_list *pmc);
173 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
174 int sfcount, __be32 *psfsrc, int delta);
175
176 static void ip_ma_put(struct ip_mc_list *im)
177 {
178 if (atomic_dec_and_test(&im->refcnt)) {
179 in_dev_put(im->interface);
180 kfree_rcu(im, rcu);
181 }
182 }
183
184 #define for_each_pmc_rcu(in_dev, pmc) \
185 for (pmc = rcu_dereference(in_dev->mc_list); \
186 pmc != NULL; \
187 pmc = rcu_dereference(pmc->next_rcu))
188
189 #define for_each_pmc_rtnl(in_dev, pmc) \
190 for (pmc = rtnl_dereference(in_dev->mc_list); \
191 pmc != NULL; \
192 pmc = rtnl_dereference(pmc->next_rcu))
193
194 #ifdef CONFIG_IP_MULTICAST
195
196 /*
197 * Timer management
198 */
199
200 static void igmp_stop_timer(struct ip_mc_list *im)
201 {
202 spin_lock_bh(&im->lock);
203 if (del_timer(&im->timer))
204 atomic_dec(&im->refcnt);
205 im->tm_running = 0;
206 im->reporter = 0;
207 im->unsolicit_count = 0;
208 spin_unlock_bh(&im->lock);
209 }
210
211 /* It must be called with locked im->lock */
212 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
213 {
214 int tv = prandom_u32() % max_delay;
215
216 im->tm_running = 1;
217 if (!mod_timer(&im->timer, jiffies+tv+2))
218 atomic_inc(&im->refcnt);
219 }
220
221 static void igmp_gq_start_timer(struct in_device *in_dev)
222 {
223 int tv = prandom_u32() % in_dev->mr_maxdelay;
224
225 in_dev->mr_gq_running = 1;
226 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
227 in_dev_hold(in_dev);
228 }
229
230 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
231 {
232 int tv = prandom_u32() % delay;
233
234 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
235 in_dev_hold(in_dev);
236 }
237
238 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
239 {
240 spin_lock_bh(&im->lock);
241 im->unsolicit_count = 0;
242 if (del_timer(&im->timer)) {
243 if ((long)(im->timer.expires-jiffies) < max_delay) {
244 add_timer(&im->timer);
245 im->tm_running = 1;
246 spin_unlock_bh(&im->lock);
247 return;
248 }
249 atomic_dec(&im->refcnt);
250 }
251 igmp_start_timer(im, max_delay);
252 spin_unlock_bh(&im->lock);
253 }
254
255
256 /*
257 * Send an IGMP report.
258 */
259
260 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
261
262
263 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
264 int gdeleted, int sdeleted)
265 {
266 switch (type) {
267 case IGMPV3_MODE_IS_INCLUDE:
268 case IGMPV3_MODE_IS_EXCLUDE:
269 if (gdeleted || sdeleted)
270 return 0;
271 if (!(pmc->gsquery && !psf->sf_gsresp)) {
272 if (pmc->sfmode == MCAST_INCLUDE)
273 return 1;
274 /* don't include if this source is excluded
275 * in all filters
276 */
277 if (psf->sf_count[MCAST_INCLUDE])
278 return type == IGMPV3_MODE_IS_INCLUDE;
279 return pmc->sfcount[MCAST_EXCLUDE] ==
280 psf->sf_count[MCAST_EXCLUDE];
281 }
282 return 0;
283 case IGMPV3_CHANGE_TO_INCLUDE:
284 if (gdeleted || sdeleted)
285 return 0;
286 return psf->sf_count[MCAST_INCLUDE] != 0;
287 case IGMPV3_CHANGE_TO_EXCLUDE:
288 if (gdeleted || sdeleted)
289 return 0;
290 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
291 psf->sf_count[MCAST_INCLUDE])
292 return 0;
293 return pmc->sfcount[MCAST_EXCLUDE] ==
294 psf->sf_count[MCAST_EXCLUDE];
295 case IGMPV3_ALLOW_NEW_SOURCES:
296 if (gdeleted || !psf->sf_crcount)
297 return 0;
298 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
299 case IGMPV3_BLOCK_OLD_SOURCES:
300 if (pmc->sfmode == MCAST_INCLUDE)
301 return gdeleted || (psf->sf_crcount && sdeleted);
302 return psf->sf_crcount && !gdeleted && !sdeleted;
303 }
304 return 0;
305 }
306
307 static int
308 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
309 {
310 struct ip_sf_list *psf;
311 int scount = 0;
312
313 for (psf = pmc->sources; psf; psf = psf->sf_next) {
314 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
315 continue;
316 scount++;
317 }
318 return scount;
319 }
320
321 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
322 {
323 struct sk_buff *skb;
324 struct rtable *rt;
325 struct iphdr *pip;
326 struct igmpv3_report *pig;
327 struct net *net = dev_net(dev);
328 struct flowi4 fl4;
329 int hlen = LL_RESERVED_SPACE(dev);
330 int tlen = dev->needed_tailroom;
331 unsigned int size = mtu;
332
333 while (1) {
334 skb = alloc_skb(size + hlen + tlen,
335 GFP_ATOMIC | __GFP_NOWARN);
336 if (skb)
337 break;
338 size >>= 1;
339 if (size < 256)
340 return NULL;
341 }
342 skb->priority = TC_PRIO_CONTROL;
343
344 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
345 0, 0,
346 IPPROTO_IGMP, 0, dev->ifindex);
347 if (IS_ERR(rt)) {
348 kfree_skb(skb);
349 return NULL;
350 }
351
352 skb_dst_set(skb, &rt->dst);
353 skb->dev = dev;
354
355 skb->reserved_tailroom = skb_end_offset(skb) -
356 min(mtu, skb_end_offset(skb));
357 skb_reserve(skb, hlen);
358
359 skb_reset_network_header(skb);
360 pip = ip_hdr(skb);
361 skb_put(skb, sizeof(struct iphdr) + 4);
362
363 pip->version = 4;
364 pip->ihl = (sizeof(struct iphdr)+4)>>2;
365 pip->tos = 0xc0;
366 pip->frag_off = htons(IP_DF);
367 pip->ttl = 1;
368 pip->daddr = fl4.daddr;
369 pip->saddr = fl4.saddr;
370 pip->protocol = IPPROTO_IGMP;
371 pip->tot_len = 0; /* filled in later */
372 ip_select_ident(skb, NULL);
373 ((u8 *)&pip[1])[0] = IPOPT_RA;
374 ((u8 *)&pip[1])[1] = 4;
375 ((u8 *)&pip[1])[2] = 0;
376 ((u8 *)&pip[1])[3] = 0;
377
378 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
379 skb_put(skb, sizeof(*pig));
380 pig = igmpv3_report_hdr(skb);
381 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
382 pig->resv1 = 0;
383 pig->csum = 0;
384 pig->resv2 = 0;
385 pig->ngrec = 0;
386 return skb;
387 }
388
389 static int igmpv3_sendpack(struct sk_buff *skb)
390 {
391 struct igmphdr *pig = igmp_hdr(skb);
392 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
393
394 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
395
396 return ip_local_out(skb);
397 }
398
399 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
400 {
401 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
402 }
403
404 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
405 int type, struct igmpv3_grec **ppgr)
406 {
407 struct net_device *dev = pmc->interface->dev;
408 struct igmpv3_report *pih;
409 struct igmpv3_grec *pgr;
410
411 if (!skb)
412 skb = igmpv3_newpack(dev, dev->mtu);
413 if (!skb)
414 return NULL;
415 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
416 pgr->grec_type = type;
417 pgr->grec_auxwords = 0;
418 pgr->grec_nsrcs = 0;
419 pgr->grec_mca = pmc->multiaddr;
420 pih = igmpv3_report_hdr(skb);
421 pih->ngrec = htons(ntohs(pih->ngrec)+1);
422 *ppgr = pgr;
423 return skb;
424 }
425
426 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
427
428 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
429 int type, int gdeleted, int sdeleted)
430 {
431 struct net_device *dev = pmc->interface->dev;
432 struct igmpv3_report *pih;
433 struct igmpv3_grec *pgr = NULL;
434 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
435 int scount, stotal, first, isquery, truncate;
436
437 if (pmc->multiaddr == IGMP_ALL_HOSTS)
438 return skb;
439
440 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
441 type == IGMPV3_MODE_IS_EXCLUDE;
442 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
443 type == IGMPV3_CHANGE_TO_EXCLUDE;
444
445 stotal = scount = 0;
446
447 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
448
449 if (!*psf_list)
450 goto empty_source;
451
452 pih = skb ? igmpv3_report_hdr(skb) : NULL;
453
454 /* EX and TO_EX get a fresh packet, if needed */
455 if (truncate) {
456 if (pih && pih->ngrec &&
457 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
458 if (skb)
459 igmpv3_sendpack(skb);
460 skb = igmpv3_newpack(dev, dev->mtu);
461 }
462 }
463 first = 1;
464 psf_prev = NULL;
465 for (psf = *psf_list; psf; psf = psf_next) {
466 __be32 *psrc;
467
468 psf_next = psf->sf_next;
469
470 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
471 psf_prev = psf;
472 continue;
473 }
474
475 /* clear marks on query responses */
476 if (isquery)
477 psf->sf_gsresp = 0;
478
479 if (AVAILABLE(skb) < sizeof(__be32) +
480 first*sizeof(struct igmpv3_grec)) {
481 if (truncate && !first)
482 break; /* truncate these */
483 if (pgr)
484 pgr->grec_nsrcs = htons(scount);
485 if (skb)
486 igmpv3_sendpack(skb);
487 skb = igmpv3_newpack(dev, dev->mtu);
488 first = 1;
489 scount = 0;
490 }
491 if (first) {
492 skb = add_grhead(skb, pmc, type, &pgr);
493 first = 0;
494 }
495 if (!skb)
496 return NULL;
497 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
498 *psrc = psf->sf_inaddr;
499 scount++; stotal++;
500 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
501 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
502 psf->sf_crcount--;
503 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
504 if (psf_prev)
505 psf_prev->sf_next = psf->sf_next;
506 else
507 *psf_list = psf->sf_next;
508 kfree(psf);
509 continue;
510 }
511 }
512 psf_prev = psf;
513 }
514
515 empty_source:
516 if (!stotal) {
517 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
518 type == IGMPV3_BLOCK_OLD_SOURCES)
519 return skb;
520 if (pmc->crcount || isquery) {
521 /* make sure we have room for group header */
522 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
523 igmpv3_sendpack(skb);
524 skb = NULL; /* add_grhead will get a new one */
525 }
526 skb = add_grhead(skb, pmc, type, &pgr);
527 }
528 }
529 if (pgr)
530 pgr->grec_nsrcs = htons(scount);
531
532 if (isquery)
533 pmc->gsquery = 0; /* clear query state on report */
534 return skb;
535 }
536
537 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
538 {
539 struct sk_buff *skb = NULL;
540 int type;
541
542 if (!pmc) {
543 rcu_read_lock();
544 for_each_pmc_rcu(in_dev, pmc) {
545 if (pmc->multiaddr == IGMP_ALL_HOSTS)
546 continue;
547 spin_lock_bh(&pmc->lock);
548 if (pmc->sfcount[MCAST_EXCLUDE])
549 type = IGMPV3_MODE_IS_EXCLUDE;
550 else
551 type = IGMPV3_MODE_IS_INCLUDE;
552 skb = add_grec(skb, pmc, type, 0, 0);
553 spin_unlock_bh(&pmc->lock);
554 }
555 rcu_read_unlock();
556 } else {
557 spin_lock_bh(&pmc->lock);
558 if (pmc->sfcount[MCAST_EXCLUDE])
559 type = IGMPV3_MODE_IS_EXCLUDE;
560 else
561 type = IGMPV3_MODE_IS_INCLUDE;
562 skb = add_grec(skb, pmc, type, 0, 0);
563 spin_unlock_bh(&pmc->lock);
564 }
565 if (!skb)
566 return 0;
567 return igmpv3_sendpack(skb);
568 }
569
570 /*
571 * remove zero-count source records from a source filter list
572 */
573 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
574 {
575 struct ip_sf_list *psf_prev, *psf_next, *psf;
576
577 psf_prev = NULL;
578 for (psf = *ppsf; psf; psf = psf_next) {
579 psf_next = psf->sf_next;
580 if (psf->sf_crcount == 0) {
581 if (psf_prev)
582 psf_prev->sf_next = psf->sf_next;
583 else
584 *ppsf = psf->sf_next;
585 kfree(psf);
586 } else
587 psf_prev = psf;
588 }
589 }
590
591 static void igmpv3_send_cr(struct in_device *in_dev)
592 {
593 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
594 struct sk_buff *skb = NULL;
595 int type, dtype;
596
597 rcu_read_lock();
598 spin_lock_bh(&in_dev->mc_tomb_lock);
599
600 /* deleted MCA's */
601 pmc_prev = NULL;
602 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
603 pmc_next = pmc->next;
604 if (pmc->sfmode == MCAST_INCLUDE) {
605 type = IGMPV3_BLOCK_OLD_SOURCES;
606 dtype = IGMPV3_BLOCK_OLD_SOURCES;
607 skb = add_grec(skb, pmc, type, 1, 0);
608 skb = add_grec(skb, pmc, dtype, 1, 1);
609 }
610 if (pmc->crcount) {
611 if (pmc->sfmode == MCAST_EXCLUDE) {
612 type = IGMPV3_CHANGE_TO_INCLUDE;
613 skb = add_grec(skb, pmc, type, 1, 0);
614 }
615 pmc->crcount--;
616 if (pmc->crcount == 0) {
617 igmpv3_clear_zeros(&pmc->tomb);
618 igmpv3_clear_zeros(&pmc->sources);
619 }
620 }
621 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
622 if (pmc_prev)
623 pmc_prev->next = pmc_next;
624 else
625 in_dev->mc_tomb = pmc_next;
626 in_dev_put(pmc->interface);
627 kfree(pmc);
628 } else
629 pmc_prev = pmc;
630 }
631 spin_unlock_bh(&in_dev->mc_tomb_lock);
632
633 /* change recs */
634 for_each_pmc_rcu(in_dev, pmc) {
635 spin_lock_bh(&pmc->lock);
636 if (pmc->sfcount[MCAST_EXCLUDE]) {
637 type = IGMPV3_BLOCK_OLD_SOURCES;
638 dtype = IGMPV3_ALLOW_NEW_SOURCES;
639 } else {
640 type = IGMPV3_ALLOW_NEW_SOURCES;
641 dtype = IGMPV3_BLOCK_OLD_SOURCES;
642 }
643 skb = add_grec(skb, pmc, type, 0, 0);
644 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
645
646 /* filter mode changes */
647 if (pmc->crcount) {
648 if (pmc->sfmode == MCAST_EXCLUDE)
649 type = IGMPV3_CHANGE_TO_EXCLUDE;
650 else
651 type = IGMPV3_CHANGE_TO_INCLUDE;
652 skb = add_grec(skb, pmc, type, 0, 0);
653 pmc->crcount--;
654 }
655 spin_unlock_bh(&pmc->lock);
656 }
657 rcu_read_unlock();
658
659 if (!skb)
660 return;
661 (void) igmpv3_sendpack(skb);
662 }
663
664 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
665 int type)
666 {
667 struct sk_buff *skb;
668 struct iphdr *iph;
669 struct igmphdr *ih;
670 struct rtable *rt;
671 struct net_device *dev = in_dev->dev;
672 struct net *net = dev_net(dev);
673 __be32 group = pmc ? pmc->multiaddr : 0;
674 struct flowi4 fl4;
675 __be32 dst;
676 int hlen, tlen;
677
678 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
679 return igmpv3_send_report(in_dev, pmc);
680 else if (type == IGMP_HOST_LEAVE_MESSAGE)
681 dst = IGMP_ALL_ROUTER;
682 else
683 dst = group;
684
685 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
686 0, 0,
687 IPPROTO_IGMP, 0, dev->ifindex);
688 if (IS_ERR(rt))
689 return -1;
690
691 hlen = LL_RESERVED_SPACE(dev);
692 tlen = dev->needed_tailroom;
693 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
694 if (skb == NULL) {
695 ip_rt_put(rt);
696 return -1;
697 }
698 skb->priority = TC_PRIO_CONTROL;
699
700 skb_dst_set(skb, &rt->dst);
701
702 skb_reserve(skb, hlen);
703
704 skb_reset_network_header(skb);
705 iph = ip_hdr(skb);
706 skb_put(skb, sizeof(struct iphdr) + 4);
707
708 iph->version = 4;
709 iph->ihl = (sizeof(struct iphdr)+4)>>2;
710 iph->tos = 0xc0;
711 iph->frag_off = htons(IP_DF);
712 iph->ttl = 1;
713 iph->daddr = dst;
714 iph->saddr = fl4.saddr;
715 iph->protocol = IPPROTO_IGMP;
716 ip_select_ident(skb, NULL);
717 ((u8 *)&iph[1])[0] = IPOPT_RA;
718 ((u8 *)&iph[1])[1] = 4;
719 ((u8 *)&iph[1])[2] = 0;
720 ((u8 *)&iph[1])[3] = 0;
721
722 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
723 ih->type = type;
724 ih->code = 0;
725 ih->csum = 0;
726 ih->group = group;
727 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
728
729 return ip_local_out(skb);
730 }
731
732 static void igmp_gq_timer_expire(unsigned long data)
733 {
734 struct in_device *in_dev = (struct in_device *)data;
735
736 in_dev->mr_gq_running = 0;
737 igmpv3_send_report(in_dev, NULL);
738 in_dev_put(in_dev);
739 }
740
741 static void igmp_ifc_timer_expire(unsigned long data)
742 {
743 struct in_device *in_dev = (struct in_device *)data;
744
745 igmpv3_send_cr(in_dev);
746 if (in_dev->mr_ifc_count) {
747 in_dev->mr_ifc_count--;
748 igmp_ifc_start_timer(in_dev,
749 unsolicited_report_interval(in_dev));
750 }
751 in_dev_put(in_dev);
752 }
753
754 static void igmp_ifc_event(struct in_device *in_dev)
755 {
756 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
757 return;
758 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
759 igmp_ifc_start_timer(in_dev, 1);
760 }
761
762
763 static void igmp_timer_expire(unsigned long data)
764 {
765 struct ip_mc_list *im = (struct ip_mc_list *)data;
766 struct in_device *in_dev = im->interface;
767
768 spin_lock(&im->lock);
769 im->tm_running = 0;
770
771 if (im->unsolicit_count) {
772 im->unsolicit_count--;
773 igmp_start_timer(im, unsolicited_report_interval(in_dev));
774 }
775 im->reporter = 1;
776 spin_unlock(&im->lock);
777
778 if (IGMP_V1_SEEN(in_dev))
779 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
780 else if (IGMP_V2_SEEN(in_dev))
781 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
782 else
783 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
784
785 ip_ma_put(im);
786 }
787
788 /* mark EXCLUDE-mode sources */
789 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
790 {
791 struct ip_sf_list *psf;
792 int i, scount;
793
794 scount = 0;
795 for (psf = pmc->sources; psf; psf = psf->sf_next) {
796 if (scount == nsrcs)
797 break;
798 for (i = 0; i < nsrcs; i++) {
799 /* skip inactive filters */
800 if (psf->sf_count[MCAST_INCLUDE] ||
801 pmc->sfcount[MCAST_EXCLUDE] !=
802 psf->sf_count[MCAST_EXCLUDE])
803 break;
804 if (srcs[i] == psf->sf_inaddr) {
805 scount++;
806 break;
807 }
808 }
809 }
810 pmc->gsquery = 0;
811 if (scount == nsrcs) /* all sources excluded */
812 return 0;
813 return 1;
814 }
815
816 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
817 {
818 struct ip_sf_list *psf;
819 int i, scount;
820
821 if (pmc->sfmode == MCAST_EXCLUDE)
822 return igmp_xmarksources(pmc, nsrcs, srcs);
823
824 /* mark INCLUDE-mode sources */
825 scount = 0;
826 for (psf = pmc->sources; psf; psf = psf->sf_next) {
827 if (scount == nsrcs)
828 break;
829 for (i = 0; i < nsrcs; i++)
830 if (srcs[i] == psf->sf_inaddr) {
831 psf->sf_gsresp = 1;
832 scount++;
833 break;
834 }
835 }
836 if (!scount) {
837 pmc->gsquery = 0;
838 return 0;
839 }
840 pmc->gsquery = 1;
841 return 1;
842 }
843
844 /* return true if packet was dropped */
845 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
846 {
847 struct ip_mc_list *im;
848
849 /* Timers are only set for non-local groups */
850
851 if (group == IGMP_ALL_HOSTS)
852 return false;
853
854 rcu_read_lock();
855 for_each_pmc_rcu(in_dev, im) {
856 if (im->multiaddr == group) {
857 igmp_stop_timer(im);
858 break;
859 }
860 }
861 rcu_read_unlock();
862 return false;
863 }
864
865 /* return true if packet was dropped */
866 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
867 int len)
868 {
869 struct igmphdr *ih = igmp_hdr(skb);
870 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
871 struct ip_mc_list *im;
872 __be32 group = ih->group;
873 int max_delay;
874 int mark = 0;
875
876
877 if (len == 8) {
878 if (ih->code == 0) {
879 /* Alas, old v1 router presents here. */
880
881 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
882 in_dev->mr_v1_seen = jiffies +
883 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
884 group = 0;
885 } else {
886 /* v2 router present */
887 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
888 in_dev->mr_v2_seen = jiffies +
889 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
890 }
891 /* cancel the interface change timer */
892 in_dev->mr_ifc_count = 0;
893 if (del_timer(&in_dev->mr_ifc_timer))
894 __in_dev_put(in_dev);
895 /* clear deleted report items */
896 igmpv3_clear_delrec(in_dev);
897 } else if (len < 12) {
898 return true; /* ignore bogus packet; freed by caller */
899 } else if (IGMP_V1_SEEN(in_dev)) {
900 /* This is a v3 query with v1 queriers present */
901 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
902 group = 0;
903 } else if (IGMP_V2_SEEN(in_dev)) {
904 /* this is a v3 query with v2 queriers present;
905 * Interpretation of the max_delay code is problematic here.
906 * A real v2 host would use ih_code directly, while v3 has a
907 * different encoding. We use the v3 encoding as more likely
908 * to be intended in a v3 query.
909 */
910 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
911 if (!max_delay)
912 max_delay = 1; /* can't mod w/ 0 */
913 } else { /* v3 */
914 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
915 return true;
916
917 ih3 = igmpv3_query_hdr(skb);
918 if (ih3->nsrcs) {
919 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
920 + ntohs(ih3->nsrcs)*sizeof(__be32)))
921 return true;
922 ih3 = igmpv3_query_hdr(skb);
923 }
924
925 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
926 if (!max_delay)
927 max_delay = 1; /* can't mod w/ 0 */
928 in_dev->mr_maxdelay = max_delay;
929 if (ih3->qrv)
930 in_dev->mr_qrv = ih3->qrv;
931 if (!group) { /* general query */
932 if (ih3->nsrcs)
933 return true; /* no sources allowed */
934 igmp_gq_start_timer(in_dev);
935 return false;
936 }
937 /* mark sources to include, if group & source-specific */
938 mark = ih3->nsrcs != 0;
939 }
940
941 /*
942 * - Start the timers in all of our membership records
943 * that the query applies to for the interface on
944 * which the query arrived excl. those that belong
945 * to a "local" group (224.0.0.X)
946 * - For timers already running check if they need to
947 * be reset.
948 * - Use the igmp->igmp_code field as the maximum
949 * delay possible
950 */
951 rcu_read_lock();
952 for_each_pmc_rcu(in_dev, im) {
953 int changed;
954
955 if (group && group != im->multiaddr)
956 continue;
957 if (im->multiaddr == IGMP_ALL_HOSTS)
958 continue;
959 spin_lock_bh(&im->lock);
960 if (im->tm_running)
961 im->gsquery = im->gsquery && mark;
962 else
963 im->gsquery = mark;
964 changed = !im->gsquery ||
965 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
966 spin_unlock_bh(&im->lock);
967 if (changed)
968 igmp_mod_timer(im, max_delay);
969 }
970 rcu_read_unlock();
971 return false;
972 }
973
974 /* called in rcu_read_lock() section */
975 int igmp_rcv(struct sk_buff *skb)
976 {
977 /* This basically follows the spec line by line -- see RFC1112 */
978 struct igmphdr *ih;
979 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
980 int len = skb->len;
981 bool dropped = true;
982
983 if (in_dev == NULL)
984 goto drop;
985
986 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
987 goto drop;
988
989 if (skb_checksum_simple_validate(skb))
990 goto drop;
991
992 ih = igmp_hdr(skb);
993 switch (ih->type) {
994 case IGMP_HOST_MEMBERSHIP_QUERY:
995 dropped = igmp_heard_query(in_dev, skb, len);
996 break;
997 case IGMP_HOST_MEMBERSHIP_REPORT:
998 case IGMPV2_HOST_MEMBERSHIP_REPORT:
999 /* Is it our report looped back? */
1000 if (rt_is_output_route(skb_rtable(skb)))
1001 break;
1002 /* don't rely on MC router hearing unicast reports */
1003 if (skb->pkt_type == PACKET_MULTICAST ||
1004 skb->pkt_type == PACKET_BROADCAST)
1005 dropped = igmp_heard_report(in_dev, ih->group);
1006 break;
1007 case IGMP_PIM:
1008 #ifdef CONFIG_IP_PIMSM_V1
1009 return pim_rcv_v1(skb);
1010 #endif
1011 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1012 case IGMP_DVMRP:
1013 case IGMP_TRACE:
1014 case IGMP_HOST_LEAVE_MESSAGE:
1015 case IGMP_MTRACE:
1016 case IGMP_MTRACE_RESP:
1017 break;
1018 default:
1019 break;
1020 }
1021
1022 drop:
1023 if (dropped)
1024 kfree_skb(skb);
1025 else
1026 consume_skb(skb);
1027 return 0;
1028 }
1029
1030 #endif
1031
1032
1033 /*
1034 * Add a filter to a device
1035 */
1036
1037 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1038 {
1039 char buf[MAX_ADDR_LEN];
1040 struct net_device *dev = in_dev->dev;
1041
1042 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1043 We will get multicast token leakage, when IFF_MULTICAST
1044 is changed. This check should be done in ndo_set_rx_mode
1045 routine. Something sort of:
1046 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1047 --ANK
1048 */
1049 if (arp_mc_map(addr, buf, dev, 0) == 0)
1050 dev_mc_add(dev, buf);
1051 }
1052
1053 /*
1054 * Remove a filter from a device
1055 */
1056
1057 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1058 {
1059 char buf[MAX_ADDR_LEN];
1060 struct net_device *dev = in_dev->dev;
1061
1062 if (arp_mc_map(addr, buf, dev, 0) == 0)
1063 dev_mc_del(dev, buf);
1064 }
1065
1066 #ifdef CONFIG_IP_MULTICAST
1067 /*
1068 * deleted ip_mc_list manipulation
1069 */
1070 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1071 {
1072 struct ip_mc_list *pmc;
1073
1074 /* this is an "ip_mc_list" for convenience; only the fields below
1075 * are actually used. In particular, the refcnt and users are not
1076 * used for management of the delete list. Using the same structure
1077 * for deleted items allows change reports to use common code with
1078 * non-deleted or query-response MCA's.
1079 */
1080 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1081 if (!pmc)
1082 return;
1083 spin_lock_bh(&im->lock);
1084 pmc->interface = im->interface;
1085 in_dev_hold(in_dev);
1086 pmc->multiaddr = im->multiaddr;
1087 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1088 pmc->sfmode = im->sfmode;
1089 if (pmc->sfmode == MCAST_INCLUDE) {
1090 struct ip_sf_list *psf;
1091
1092 pmc->tomb = im->tomb;
1093 pmc->sources = im->sources;
1094 im->tomb = im->sources = NULL;
1095 for (psf = pmc->sources; psf; psf = psf->sf_next)
1096 psf->sf_crcount = pmc->crcount;
1097 }
1098 spin_unlock_bh(&im->lock);
1099
1100 spin_lock_bh(&in_dev->mc_tomb_lock);
1101 pmc->next = in_dev->mc_tomb;
1102 in_dev->mc_tomb = pmc;
1103 spin_unlock_bh(&in_dev->mc_tomb_lock);
1104 }
1105
1106 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1107 {
1108 struct ip_mc_list *pmc, *pmc_prev;
1109 struct ip_sf_list *psf, *psf_next;
1110
1111 spin_lock_bh(&in_dev->mc_tomb_lock);
1112 pmc_prev = NULL;
1113 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1114 if (pmc->multiaddr == multiaddr)
1115 break;
1116 pmc_prev = pmc;
1117 }
1118 if (pmc) {
1119 if (pmc_prev)
1120 pmc_prev->next = pmc->next;
1121 else
1122 in_dev->mc_tomb = pmc->next;
1123 }
1124 spin_unlock_bh(&in_dev->mc_tomb_lock);
1125 if (pmc) {
1126 for (psf = pmc->tomb; psf; psf = psf_next) {
1127 psf_next = psf->sf_next;
1128 kfree(psf);
1129 }
1130 in_dev_put(pmc->interface);
1131 kfree(pmc);
1132 }
1133 }
1134
1135 static void igmpv3_clear_delrec(struct in_device *in_dev)
1136 {
1137 struct ip_mc_list *pmc, *nextpmc;
1138
1139 spin_lock_bh(&in_dev->mc_tomb_lock);
1140 pmc = in_dev->mc_tomb;
1141 in_dev->mc_tomb = NULL;
1142 spin_unlock_bh(&in_dev->mc_tomb_lock);
1143
1144 for (; pmc; pmc = nextpmc) {
1145 nextpmc = pmc->next;
1146 ip_mc_clear_src(pmc);
1147 in_dev_put(pmc->interface);
1148 kfree(pmc);
1149 }
1150 /* clear dead sources, too */
1151 rcu_read_lock();
1152 for_each_pmc_rcu(in_dev, pmc) {
1153 struct ip_sf_list *psf, *psf_next;
1154
1155 spin_lock_bh(&pmc->lock);
1156 psf = pmc->tomb;
1157 pmc->tomb = NULL;
1158 spin_unlock_bh(&pmc->lock);
1159 for (; psf; psf = psf_next) {
1160 psf_next = psf->sf_next;
1161 kfree(psf);
1162 }
1163 }
1164 rcu_read_unlock();
1165 }
1166 #endif
1167
1168 static void igmp_group_dropped(struct ip_mc_list *im)
1169 {
1170 struct in_device *in_dev = im->interface;
1171 #ifdef CONFIG_IP_MULTICAST
1172 int reporter;
1173 #endif
1174
1175 if (im->loaded) {
1176 im->loaded = 0;
1177 ip_mc_filter_del(in_dev, im->multiaddr);
1178 }
1179
1180 #ifdef CONFIG_IP_MULTICAST
1181 if (im->multiaddr == IGMP_ALL_HOSTS)
1182 return;
1183
1184 reporter = im->reporter;
1185 igmp_stop_timer(im);
1186
1187 if (!in_dev->dead) {
1188 if (IGMP_V1_SEEN(in_dev))
1189 return;
1190 if (IGMP_V2_SEEN(in_dev)) {
1191 if (reporter)
1192 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1193 return;
1194 }
1195 /* IGMPv3 */
1196 igmpv3_add_delrec(in_dev, im);
1197
1198 igmp_ifc_event(in_dev);
1199 }
1200 #endif
1201 }
1202
1203 static void igmp_group_added(struct ip_mc_list *im)
1204 {
1205 struct in_device *in_dev = im->interface;
1206
1207 if (im->loaded == 0) {
1208 im->loaded = 1;
1209 ip_mc_filter_add(in_dev, im->multiaddr);
1210 }
1211
1212 #ifdef CONFIG_IP_MULTICAST
1213 if (im->multiaddr == IGMP_ALL_HOSTS)
1214 return;
1215
1216 if (in_dev->dead)
1217 return;
1218 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1219 spin_lock_bh(&im->lock);
1220 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1221 spin_unlock_bh(&im->lock);
1222 return;
1223 }
1224 /* else, v3 */
1225
1226 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1227 igmp_ifc_event(in_dev);
1228 #endif
1229 }
1230
1231
1232 /*
1233 * Multicast list managers
1234 */
1235
1236 static u32 ip_mc_hash(const struct ip_mc_list *im)
1237 {
1238 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1239 }
1240
1241 static void ip_mc_hash_add(struct in_device *in_dev,
1242 struct ip_mc_list *im)
1243 {
1244 struct ip_mc_list __rcu **mc_hash;
1245 u32 hash;
1246
1247 mc_hash = rtnl_dereference(in_dev->mc_hash);
1248 if (mc_hash) {
1249 hash = ip_mc_hash(im);
1250 im->next_hash = mc_hash[hash];
1251 rcu_assign_pointer(mc_hash[hash], im);
1252 return;
1253 }
1254
1255 /* do not use a hash table for small number of items */
1256 if (in_dev->mc_count < 4)
1257 return;
1258
1259 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1260 GFP_KERNEL);
1261 if (!mc_hash)
1262 return;
1263
1264 for_each_pmc_rtnl(in_dev, im) {
1265 hash = ip_mc_hash(im);
1266 im->next_hash = mc_hash[hash];
1267 RCU_INIT_POINTER(mc_hash[hash], im);
1268 }
1269
1270 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1271 }
1272
1273 static void ip_mc_hash_remove(struct in_device *in_dev,
1274 struct ip_mc_list *im)
1275 {
1276 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1277 struct ip_mc_list *aux;
1278
1279 if (!mc_hash)
1280 return;
1281 mc_hash += ip_mc_hash(im);
1282 while ((aux = rtnl_dereference(*mc_hash)) != im)
1283 mc_hash = &aux->next_hash;
1284 *mc_hash = im->next_hash;
1285 }
1286
1287
1288 /*
1289 * A socket has joined a multicast group on device dev.
1290 */
1291
1292 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1293 {
1294 struct ip_mc_list *im;
1295
1296 ASSERT_RTNL();
1297
1298 for_each_pmc_rtnl(in_dev, im) {
1299 if (im->multiaddr == addr) {
1300 im->users++;
1301 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1302 goto out;
1303 }
1304 }
1305
1306 im = kzalloc(sizeof(*im), GFP_KERNEL);
1307 if (!im)
1308 goto out;
1309
1310 im->users = 1;
1311 im->interface = in_dev;
1312 in_dev_hold(in_dev);
1313 im->multiaddr = addr;
1314 /* initial mode is (EX, empty) */
1315 im->sfmode = MCAST_EXCLUDE;
1316 im->sfcount[MCAST_EXCLUDE] = 1;
1317 atomic_set(&im->refcnt, 1);
1318 spin_lock_init(&im->lock);
1319 #ifdef CONFIG_IP_MULTICAST
1320 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1321 im->unsolicit_count = sysctl_igmp_qrv;
1322 #endif
1323
1324 im->next_rcu = in_dev->mc_list;
1325 in_dev->mc_count++;
1326 rcu_assign_pointer(in_dev->mc_list, im);
1327
1328 ip_mc_hash_add(in_dev, im);
1329
1330 #ifdef CONFIG_IP_MULTICAST
1331 igmpv3_del_delrec(in_dev, im->multiaddr);
1332 #endif
1333 igmp_group_added(im);
1334 if (!in_dev->dead)
1335 ip_rt_multicast_event(in_dev);
1336 out:
1337 return;
1338 }
1339 EXPORT_SYMBOL(ip_mc_inc_group);
1340
1341 /*
1342 * Resend IGMP JOIN report; used by netdev notifier.
1343 */
1344 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1345 {
1346 #ifdef CONFIG_IP_MULTICAST
1347 struct ip_mc_list *im;
1348 int type;
1349
1350 ASSERT_RTNL();
1351
1352 for_each_pmc_rtnl(in_dev, im) {
1353 if (im->multiaddr == IGMP_ALL_HOSTS)
1354 continue;
1355
1356 /* a failover is happening and switches
1357 * must be notified immediately
1358 */
1359 if (IGMP_V1_SEEN(in_dev))
1360 type = IGMP_HOST_MEMBERSHIP_REPORT;
1361 else if (IGMP_V2_SEEN(in_dev))
1362 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1363 else
1364 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1365 igmp_send_report(in_dev, im, type);
1366 }
1367 #endif
1368 }
1369
1370 /*
1371 * A socket has left a multicast group on device dev
1372 */
1373
1374 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1375 {
1376 struct ip_mc_list *i;
1377 struct ip_mc_list __rcu **ip;
1378
1379 ASSERT_RTNL();
1380
1381 for (ip = &in_dev->mc_list;
1382 (i = rtnl_dereference(*ip)) != NULL;
1383 ip = &i->next_rcu) {
1384 if (i->multiaddr == addr) {
1385 if (--i->users == 0) {
1386 ip_mc_hash_remove(in_dev, i);
1387 *ip = i->next_rcu;
1388 in_dev->mc_count--;
1389 igmp_group_dropped(i);
1390 ip_mc_clear_src(i);
1391
1392 if (!in_dev->dead)
1393 ip_rt_multicast_event(in_dev);
1394
1395 ip_ma_put(i);
1396 return;
1397 }
1398 break;
1399 }
1400 }
1401 }
1402 EXPORT_SYMBOL(ip_mc_dec_group);
1403
1404 /* Device changing type */
1405
1406 void ip_mc_unmap(struct in_device *in_dev)
1407 {
1408 struct ip_mc_list *pmc;
1409
1410 ASSERT_RTNL();
1411
1412 for_each_pmc_rtnl(in_dev, pmc)
1413 igmp_group_dropped(pmc);
1414 }
1415
1416 void ip_mc_remap(struct in_device *in_dev)
1417 {
1418 struct ip_mc_list *pmc;
1419
1420 ASSERT_RTNL();
1421
1422 for_each_pmc_rtnl(in_dev, pmc)
1423 igmp_group_added(pmc);
1424 }
1425
1426 /* Device going down */
1427
1428 void ip_mc_down(struct in_device *in_dev)
1429 {
1430 struct ip_mc_list *pmc;
1431
1432 ASSERT_RTNL();
1433
1434 for_each_pmc_rtnl(in_dev, pmc)
1435 igmp_group_dropped(pmc);
1436
1437 #ifdef CONFIG_IP_MULTICAST
1438 in_dev->mr_ifc_count = 0;
1439 if (del_timer(&in_dev->mr_ifc_timer))
1440 __in_dev_put(in_dev);
1441 in_dev->mr_gq_running = 0;
1442 if (del_timer(&in_dev->mr_gq_timer))
1443 __in_dev_put(in_dev);
1444 igmpv3_clear_delrec(in_dev);
1445 #endif
1446
1447 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1448 }
1449
1450 void ip_mc_init_dev(struct in_device *in_dev)
1451 {
1452 ASSERT_RTNL();
1453
1454 #ifdef CONFIG_IP_MULTICAST
1455 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1456 (unsigned long)in_dev);
1457 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1458 (unsigned long)in_dev);
1459 in_dev->mr_qrv = sysctl_igmp_qrv;
1460 #endif
1461
1462 spin_lock_init(&in_dev->mc_tomb_lock);
1463 }
1464
1465 /* Device going up */
1466
1467 void ip_mc_up(struct in_device *in_dev)
1468 {
1469 struct ip_mc_list *pmc;
1470
1471 ASSERT_RTNL();
1472
1473 #ifdef CONFIG_IP_MULTICAST
1474 in_dev->mr_qrv = sysctl_igmp_qrv;
1475 #endif
1476 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1477
1478 for_each_pmc_rtnl(in_dev, pmc)
1479 igmp_group_added(pmc);
1480 }
1481
1482 /*
1483 * Device is about to be destroyed: clean up.
1484 */
1485
1486 void ip_mc_destroy_dev(struct in_device *in_dev)
1487 {
1488 struct ip_mc_list *i;
1489
1490 ASSERT_RTNL();
1491
1492 /* Deactivate timers */
1493 ip_mc_down(in_dev);
1494
1495 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1496 in_dev->mc_list = i->next_rcu;
1497 in_dev->mc_count--;
1498
1499 /* We've dropped the groups in ip_mc_down already */
1500 ip_mc_clear_src(i);
1501 ip_ma_put(i);
1502 }
1503 }
1504
1505 /* RTNL is locked */
1506 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1507 {
1508 struct net_device *dev = NULL;
1509 struct in_device *idev = NULL;
1510
1511 if (imr->imr_ifindex) {
1512 idev = inetdev_by_index(net, imr->imr_ifindex);
1513 return idev;
1514 }
1515 if (imr->imr_address.s_addr) {
1516 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1517 if (!dev)
1518 return NULL;
1519 }
1520
1521 if (!dev) {
1522 struct rtable *rt = ip_route_output(net,
1523 imr->imr_multiaddr.s_addr,
1524 0, 0, 0);
1525 if (!IS_ERR(rt)) {
1526 dev = rt->dst.dev;
1527 ip_rt_put(rt);
1528 }
1529 }
1530 if (dev) {
1531 imr->imr_ifindex = dev->ifindex;
1532 idev = __in_dev_get_rtnl(dev);
1533 }
1534 return idev;
1535 }
1536
1537 /*
1538 * Join a socket to a group
1539 */
1540 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1541 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1542 #ifdef CONFIG_IP_MULTICAST
1543 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
1544 #endif
1545
1546 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1547 __be32 *psfsrc)
1548 {
1549 struct ip_sf_list *psf, *psf_prev;
1550 int rv = 0;
1551
1552 psf_prev = NULL;
1553 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1554 if (psf->sf_inaddr == *psfsrc)
1555 break;
1556 psf_prev = psf;
1557 }
1558 if (!psf || psf->sf_count[sfmode] == 0) {
1559 /* source filter not found, or count wrong => bug */
1560 return -ESRCH;
1561 }
1562 psf->sf_count[sfmode]--;
1563 if (psf->sf_count[sfmode] == 0) {
1564 ip_rt_multicast_event(pmc->interface);
1565 }
1566 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1567 #ifdef CONFIG_IP_MULTICAST
1568 struct in_device *in_dev = pmc->interface;
1569 #endif
1570
1571 /* no more filters for this source */
1572 if (psf_prev)
1573 psf_prev->sf_next = psf->sf_next;
1574 else
1575 pmc->sources = psf->sf_next;
1576 #ifdef CONFIG_IP_MULTICAST
1577 if (psf->sf_oldin &&
1578 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1579 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1580 psf->sf_next = pmc->tomb;
1581 pmc->tomb = psf;
1582 rv = 1;
1583 } else
1584 #endif
1585 kfree(psf);
1586 }
1587 return rv;
1588 }
1589
1590 #ifndef CONFIG_IP_MULTICAST
1591 #define igmp_ifc_event(x) do { } while (0)
1592 #endif
1593
1594 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1595 int sfcount, __be32 *psfsrc, int delta)
1596 {
1597 struct ip_mc_list *pmc;
1598 int changerec = 0;
1599 int i, err;
1600
1601 if (!in_dev)
1602 return -ENODEV;
1603 rcu_read_lock();
1604 for_each_pmc_rcu(in_dev, pmc) {
1605 if (*pmca == pmc->multiaddr)
1606 break;
1607 }
1608 if (!pmc) {
1609 /* MCA not found?? bug */
1610 rcu_read_unlock();
1611 return -ESRCH;
1612 }
1613 spin_lock_bh(&pmc->lock);
1614 rcu_read_unlock();
1615 #ifdef CONFIG_IP_MULTICAST
1616 sf_markstate(pmc);
1617 #endif
1618 if (!delta) {
1619 err = -EINVAL;
1620 if (!pmc->sfcount[sfmode])
1621 goto out_unlock;
1622 pmc->sfcount[sfmode]--;
1623 }
1624 err = 0;
1625 for (i = 0; i < sfcount; i++) {
1626 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1627
1628 changerec |= rv > 0;
1629 if (!err && rv < 0)
1630 err = rv;
1631 }
1632 if (pmc->sfmode == MCAST_EXCLUDE &&
1633 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1634 pmc->sfcount[MCAST_INCLUDE]) {
1635 #ifdef CONFIG_IP_MULTICAST
1636 struct ip_sf_list *psf;
1637 #endif
1638
1639 /* filter mode change */
1640 pmc->sfmode = MCAST_INCLUDE;
1641 #ifdef CONFIG_IP_MULTICAST
1642 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1643 in_dev->mr_ifc_count = pmc->crcount;
1644 for (psf = pmc->sources; psf; psf = psf->sf_next)
1645 psf->sf_crcount = 0;
1646 igmp_ifc_event(pmc->interface);
1647 } else if (sf_setstate(pmc) || changerec) {
1648 igmp_ifc_event(pmc->interface);
1649 #endif
1650 }
1651 out_unlock:
1652 spin_unlock_bh(&pmc->lock);
1653 return err;
1654 }
1655
1656 /*
1657 * Add multicast single-source filter to the interface list
1658 */
1659 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1660 __be32 *psfsrc)
1661 {
1662 struct ip_sf_list *psf, *psf_prev;
1663
1664 psf_prev = NULL;
1665 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1666 if (psf->sf_inaddr == *psfsrc)
1667 break;
1668 psf_prev = psf;
1669 }
1670 if (!psf) {
1671 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1672 if (!psf)
1673 return -ENOBUFS;
1674 psf->sf_inaddr = *psfsrc;
1675 if (psf_prev) {
1676 psf_prev->sf_next = psf;
1677 } else
1678 pmc->sources = psf;
1679 }
1680 psf->sf_count[sfmode]++;
1681 if (psf->sf_count[sfmode] == 1) {
1682 ip_rt_multicast_event(pmc->interface);
1683 }
1684 return 0;
1685 }
1686
1687 #ifdef CONFIG_IP_MULTICAST
1688 static void sf_markstate(struct ip_mc_list *pmc)
1689 {
1690 struct ip_sf_list *psf;
1691 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1692
1693 for (psf = pmc->sources; psf; psf = psf->sf_next)
1694 if (pmc->sfcount[MCAST_EXCLUDE]) {
1695 psf->sf_oldin = mca_xcount ==
1696 psf->sf_count[MCAST_EXCLUDE] &&
1697 !psf->sf_count[MCAST_INCLUDE];
1698 } else
1699 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1700 }
1701
1702 static int sf_setstate(struct ip_mc_list *pmc)
1703 {
1704 struct ip_sf_list *psf, *dpsf;
1705 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1706 int qrv = pmc->interface->mr_qrv;
1707 int new_in, rv;
1708
1709 rv = 0;
1710 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1711 if (pmc->sfcount[MCAST_EXCLUDE]) {
1712 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1713 !psf->sf_count[MCAST_INCLUDE];
1714 } else
1715 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1716 if (new_in) {
1717 if (!psf->sf_oldin) {
1718 struct ip_sf_list *prev = NULL;
1719
1720 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1721 if (dpsf->sf_inaddr == psf->sf_inaddr)
1722 break;
1723 prev = dpsf;
1724 }
1725 if (dpsf) {
1726 if (prev)
1727 prev->sf_next = dpsf->sf_next;
1728 else
1729 pmc->tomb = dpsf->sf_next;
1730 kfree(dpsf);
1731 }
1732 psf->sf_crcount = qrv;
1733 rv++;
1734 }
1735 } else if (psf->sf_oldin) {
1736
1737 psf->sf_crcount = 0;
1738 /*
1739 * add or update "delete" records if an active filter
1740 * is now inactive
1741 */
1742 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1743 if (dpsf->sf_inaddr == psf->sf_inaddr)
1744 break;
1745 if (!dpsf) {
1746 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1747 if (!dpsf)
1748 continue;
1749 *dpsf = *psf;
1750 /* pmc->lock held by callers */
1751 dpsf->sf_next = pmc->tomb;
1752 pmc->tomb = dpsf;
1753 }
1754 dpsf->sf_crcount = qrv;
1755 rv++;
1756 }
1757 }
1758 return rv;
1759 }
1760 #endif
1761
1762 /*
1763 * Add multicast source filter list to the interface list
1764 */
1765 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1766 int sfcount, __be32 *psfsrc, int delta)
1767 {
1768 struct ip_mc_list *pmc;
1769 int isexclude;
1770 int i, err;
1771
1772 if (!in_dev)
1773 return -ENODEV;
1774 rcu_read_lock();
1775 for_each_pmc_rcu(in_dev, pmc) {
1776 if (*pmca == pmc->multiaddr)
1777 break;
1778 }
1779 if (!pmc) {
1780 /* MCA not found?? bug */
1781 rcu_read_unlock();
1782 return -ESRCH;
1783 }
1784 spin_lock_bh(&pmc->lock);
1785 rcu_read_unlock();
1786
1787 #ifdef CONFIG_IP_MULTICAST
1788 sf_markstate(pmc);
1789 #endif
1790 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1791 if (!delta)
1792 pmc->sfcount[sfmode]++;
1793 err = 0;
1794 for (i = 0; i < sfcount; i++) {
1795 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1796 if (err)
1797 break;
1798 }
1799 if (err) {
1800 int j;
1801
1802 if (!delta)
1803 pmc->sfcount[sfmode]--;
1804 for (j = 0; j < i; j++)
1805 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1806 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1807 #ifdef CONFIG_IP_MULTICAST
1808 struct ip_sf_list *psf;
1809 in_dev = pmc->interface;
1810 #endif
1811
1812 /* filter mode change */
1813 if (pmc->sfcount[MCAST_EXCLUDE])
1814 pmc->sfmode = MCAST_EXCLUDE;
1815 else if (pmc->sfcount[MCAST_INCLUDE])
1816 pmc->sfmode = MCAST_INCLUDE;
1817 #ifdef CONFIG_IP_MULTICAST
1818 /* else no filters; keep old mode for reports */
1819
1820 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1821 in_dev->mr_ifc_count = pmc->crcount;
1822 for (psf = pmc->sources; psf; psf = psf->sf_next)
1823 psf->sf_crcount = 0;
1824 igmp_ifc_event(in_dev);
1825 } else if (sf_setstate(pmc)) {
1826 igmp_ifc_event(in_dev);
1827 #endif
1828 }
1829 spin_unlock_bh(&pmc->lock);
1830 return err;
1831 }
1832
1833 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1834 {
1835 struct ip_sf_list *psf, *nextpsf;
1836
1837 for (psf = pmc->tomb; psf; psf = nextpsf) {
1838 nextpsf = psf->sf_next;
1839 kfree(psf);
1840 }
1841 pmc->tomb = NULL;
1842 for (psf = pmc->sources; psf; psf = nextpsf) {
1843 nextpsf = psf->sf_next;
1844 kfree(psf);
1845 }
1846 pmc->sources = NULL;
1847 pmc->sfmode = MCAST_EXCLUDE;
1848 pmc->sfcount[MCAST_INCLUDE] = 0;
1849 pmc->sfcount[MCAST_EXCLUDE] = 1;
1850 }
1851
1852
1853 /*
1854 * Join a multicast group
1855 */
1856 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1857 {
1858 int err;
1859 __be32 addr = imr->imr_multiaddr.s_addr;
1860 struct ip_mc_socklist *iml = NULL, *i;
1861 struct in_device *in_dev;
1862 struct inet_sock *inet = inet_sk(sk);
1863 struct net *net = sock_net(sk);
1864 int ifindex;
1865 int count = 0;
1866
1867 if (!ipv4_is_multicast(addr))
1868 return -EINVAL;
1869
1870 rtnl_lock();
1871
1872 in_dev = ip_mc_find_dev(net, imr);
1873
1874 if (!in_dev) {
1875 iml = NULL;
1876 err = -ENODEV;
1877 goto done;
1878 }
1879
1880 err = -EADDRINUSE;
1881 ifindex = imr->imr_ifindex;
1882 for_each_pmc_rtnl(inet, i) {
1883 if (i->multi.imr_multiaddr.s_addr == addr &&
1884 i->multi.imr_ifindex == ifindex)
1885 goto done;
1886 count++;
1887 }
1888 err = -ENOBUFS;
1889 if (count >= sysctl_igmp_max_memberships)
1890 goto done;
1891 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1892 if (iml == NULL)
1893 goto done;
1894
1895 memcpy(&iml->multi, imr, sizeof(*imr));
1896 iml->next_rcu = inet->mc_list;
1897 iml->sflist = NULL;
1898 iml->sfmode = MCAST_EXCLUDE;
1899 rcu_assign_pointer(inet->mc_list, iml);
1900 ip_mc_inc_group(in_dev, addr);
1901 err = 0;
1902 done:
1903 rtnl_unlock();
1904 return err;
1905 }
1906 EXPORT_SYMBOL(ip_mc_join_group);
1907
1908 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1909 struct in_device *in_dev)
1910 {
1911 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1912 int err;
1913
1914 if (psf == NULL) {
1915 /* any-source empty exclude case */
1916 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1917 iml->sfmode, 0, NULL, 0);
1918 }
1919 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1920 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1921 RCU_INIT_POINTER(iml->sflist, NULL);
1922 /* decrease mem now to avoid the memleak warning */
1923 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1924 kfree_rcu(psf, rcu);
1925 return err;
1926 }
1927
1928 /*
1929 * Ask a socket to leave a group.
1930 */
1931
1932 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1933 {
1934 struct inet_sock *inet = inet_sk(sk);
1935 struct ip_mc_socklist *iml;
1936 struct ip_mc_socklist __rcu **imlp;
1937 struct in_device *in_dev;
1938 struct net *net = sock_net(sk);
1939 __be32 group = imr->imr_multiaddr.s_addr;
1940 u32 ifindex;
1941 int ret = -EADDRNOTAVAIL;
1942
1943 rtnl_lock();
1944 in_dev = ip_mc_find_dev(net, imr);
1945 if (!in_dev) {
1946 ret = -ENODEV;
1947 goto out;
1948 }
1949 ifindex = imr->imr_ifindex;
1950 for (imlp = &inet->mc_list;
1951 (iml = rtnl_dereference(*imlp)) != NULL;
1952 imlp = &iml->next_rcu) {
1953 if (iml->multi.imr_multiaddr.s_addr != group)
1954 continue;
1955 if (ifindex) {
1956 if (iml->multi.imr_ifindex != ifindex)
1957 continue;
1958 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1959 iml->multi.imr_address.s_addr)
1960 continue;
1961
1962 (void) ip_mc_leave_src(sk, iml, in_dev);
1963
1964 *imlp = iml->next_rcu;
1965
1966 ip_mc_dec_group(in_dev, group);
1967 rtnl_unlock();
1968 /* decrease mem now to avoid the memleak warning */
1969 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1970 kfree_rcu(iml, rcu);
1971 return 0;
1972 }
1973 out:
1974 rtnl_unlock();
1975 return ret;
1976 }
1977 EXPORT_SYMBOL(ip_mc_leave_group);
1978
1979 int ip_mc_source(int add, int omode, struct sock *sk, struct
1980 ip_mreq_source *mreqs, int ifindex)
1981 {
1982 int err;
1983 struct ip_mreqn imr;
1984 __be32 addr = mreqs->imr_multiaddr;
1985 struct ip_mc_socklist *pmc;
1986 struct in_device *in_dev = NULL;
1987 struct inet_sock *inet = inet_sk(sk);
1988 struct ip_sf_socklist *psl;
1989 struct net *net = sock_net(sk);
1990 int leavegroup = 0;
1991 int i, j, rv;
1992
1993 if (!ipv4_is_multicast(addr))
1994 return -EINVAL;
1995
1996 rtnl_lock();
1997
1998 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1999 imr.imr_address.s_addr = mreqs->imr_interface;
2000 imr.imr_ifindex = ifindex;
2001 in_dev = ip_mc_find_dev(net, &imr);
2002
2003 if (!in_dev) {
2004 err = -ENODEV;
2005 goto done;
2006 }
2007 err = -EADDRNOTAVAIL;
2008
2009 for_each_pmc_rtnl(inet, pmc) {
2010 if ((pmc->multi.imr_multiaddr.s_addr ==
2011 imr.imr_multiaddr.s_addr) &&
2012 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2013 break;
2014 }
2015 if (!pmc) { /* must have a prior join */
2016 err = -EINVAL;
2017 goto done;
2018 }
2019 /* if a source filter was set, must be the same mode as before */
2020 if (pmc->sflist) {
2021 if (pmc->sfmode != omode) {
2022 err = -EINVAL;
2023 goto done;
2024 }
2025 } else if (pmc->sfmode != omode) {
2026 /* allow mode switches for empty-set filters */
2027 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2028 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2029 NULL, 0);
2030 pmc->sfmode = omode;
2031 }
2032
2033 psl = rtnl_dereference(pmc->sflist);
2034 if (!add) {
2035 if (!psl)
2036 goto done; /* err = -EADDRNOTAVAIL */
2037 rv = !0;
2038 for (i = 0; i < psl->sl_count; i++) {
2039 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2040 sizeof(__be32));
2041 if (rv == 0)
2042 break;
2043 }
2044 if (rv) /* source not found */
2045 goto done; /* err = -EADDRNOTAVAIL */
2046
2047 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2048 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2049 leavegroup = 1;
2050 goto done;
2051 }
2052
2053 /* update the interface filter */
2054 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2055 &mreqs->imr_sourceaddr, 1);
2056
2057 for (j = i+1; j < psl->sl_count; j++)
2058 psl->sl_addr[j-1] = psl->sl_addr[j];
2059 psl->sl_count--;
2060 err = 0;
2061 goto done;
2062 }
2063 /* else, add a new source to the filter */
2064
2065 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2066 err = -ENOBUFS;
2067 goto done;
2068 }
2069 if (!psl || psl->sl_count == psl->sl_max) {
2070 struct ip_sf_socklist *newpsl;
2071 int count = IP_SFBLOCK;
2072
2073 if (psl)
2074 count += psl->sl_max;
2075 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2076 if (!newpsl) {
2077 err = -ENOBUFS;
2078 goto done;
2079 }
2080 newpsl->sl_max = count;
2081 newpsl->sl_count = count - IP_SFBLOCK;
2082 if (psl) {
2083 for (i = 0; i < psl->sl_count; i++)
2084 newpsl->sl_addr[i] = psl->sl_addr[i];
2085 /* decrease mem now to avoid the memleak warning */
2086 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2087 kfree_rcu(psl, rcu);
2088 }
2089 rcu_assign_pointer(pmc->sflist, newpsl);
2090 psl = newpsl;
2091 }
2092 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2093 for (i = 0; i < psl->sl_count; i++) {
2094 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2095 sizeof(__be32));
2096 if (rv == 0)
2097 break;
2098 }
2099 if (rv == 0) /* address already there is an error */
2100 goto done;
2101 for (j = psl->sl_count-1; j >= i; j--)
2102 psl->sl_addr[j+1] = psl->sl_addr[j];
2103 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2104 psl->sl_count++;
2105 err = 0;
2106 /* update the interface list */
2107 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2108 &mreqs->imr_sourceaddr, 1);
2109 done:
2110 rtnl_unlock();
2111 if (leavegroup)
2112 return ip_mc_leave_group(sk, &imr);
2113 return err;
2114 }
2115
2116 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2117 {
2118 int err = 0;
2119 struct ip_mreqn imr;
2120 __be32 addr = msf->imsf_multiaddr;
2121 struct ip_mc_socklist *pmc;
2122 struct in_device *in_dev;
2123 struct inet_sock *inet = inet_sk(sk);
2124 struct ip_sf_socklist *newpsl, *psl;
2125 struct net *net = sock_net(sk);
2126 int leavegroup = 0;
2127
2128 if (!ipv4_is_multicast(addr))
2129 return -EINVAL;
2130 if (msf->imsf_fmode != MCAST_INCLUDE &&
2131 msf->imsf_fmode != MCAST_EXCLUDE)
2132 return -EINVAL;
2133
2134 rtnl_lock();
2135
2136 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2137 imr.imr_address.s_addr = msf->imsf_interface;
2138 imr.imr_ifindex = ifindex;
2139 in_dev = ip_mc_find_dev(net, &imr);
2140
2141 if (!in_dev) {
2142 err = -ENODEV;
2143 goto done;
2144 }
2145
2146 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2147 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2148 leavegroup = 1;
2149 goto done;
2150 }
2151
2152 for_each_pmc_rtnl(inet, pmc) {
2153 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2154 pmc->multi.imr_ifindex == imr.imr_ifindex)
2155 break;
2156 }
2157 if (!pmc) { /* must have a prior join */
2158 err = -EINVAL;
2159 goto done;
2160 }
2161 if (msf->imsf_numsrc) {
2162 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2163 GFP_KERNEL);
2164 if (!newpsl) {
2165 err = -ENOBUFS;
2166 goto done;
2167 }
2168 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2169 memcpy(newpsl->sl_addr, msf->imsf_slist,
2170 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2171 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2172 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2173 if (err) {
2174 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2175 goto done;
2176 }
2177 } else {
2178 newpsl = NULL;
2179 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2180 msf->imsf_fmode, 0, NULL, 0);
2181 }
2182 psl = rtnl_dereference(pmc->sflist);
2183 if (psl) {
2184 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2185 psl->sl_count, psl->sl_addr, 0);
2186 /* decrease mem now to avoid the memleak warning */
2187 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2188 kfree_rcu(psl, rcu);
2189 } else
2190 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2191 0, NULL, 0);
2192 rcu_assign_pointer(pmc->sflist, newpsl);
2193 pmc->sfmode = msf->imsf_fmode;
2194 err = 0;
2195 done:
2196 rtnl_unlock();
2197 if (leavegroup)
2198 err = ip_mc_leave_group(sk, &imr);
2199 return err;
2200 }
2201
2202 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2203 struct ip_msfilter __user *optval, int __user *optlen)
2204 {
2205 int err, len, count, copycount;
2206 struct ip_mreqn imr;
2207 __be32 addr = msf->imsf_multiaddr;
2208 struct ip_mc_socklist *pmc;
2209 struct in_device *in_dev;
2210 struct inet_sock *inet = inet_sk(sk);
2211 struct ip_sf_socklist *psl;
2212 struct net *net = sock_net(sk);
2213
2214 if (!ipv4_is_multicast(addr))
2215 return -EINVAL;
2216
2217 rtnl_lock();
2218
2219 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2220 imr.imr_address.s_addr = msf->imsf_interface;
2221 imr.imr_ifindex = 0;
2222 in_dev = ip_mc_find_dev(net, &imr);
2223
2224 if (!in_dev) {
2225 err = -ENODEV;
2226 goto done;
2227 }
2228 err = -EADDRNOTAVAIL;
2229
2230 for_each_pmc_rtnl(inet, pmc) {
2231 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2232 pmc->multi.imr_ifindex == imr.imr_ifindex)
2233 break;
2234 }
2235 if (!pmc) /* must have a prior join */
2236 goto done;
2237 msf->imsf_fmode = pmc->sfmode;
2238 psl = rtnl_dereference(pmc->sflist);
2239 rtnl_unlock();
2240 if (!psl) {
2241 len = 0;
2242 count = 0;
2243 } else {
2244 count = psl->sl_count;
2245 }
2246 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2247 len = copycount * sizeof(psl->sl_addr[0]);
2248 msf->imsf_numsrc = count;
2249 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2250 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2251 return -EFAULT;
2252 }
2253 if (len &&
2254 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2255 return -EFAULT;
2256 return 0;
2257 done:
2258 rtnl_unlock();
2259 return err;
2260 }
2261
2262 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2263 struct group_filter __user *optval, int __user *optlen)
2264 {
2265 int err, i, count, copycount;
2266 struct sockaddr_in *psin;
2267 __be32 addr;
2268 struct ip_mc_socklist *pmc;
2269 struct inet_sock *inet = inet_sk(sk);
2270 struct ip_sf_socklist *psl;
2271
2272 psin = (struct sockaddr_in *)&gsf->gf_group;
2273 if (psin->sin_family != AF_INET)
2274 return -EINVAL;
2275 addr = psin->sin_addr.s_addr;
2276 if (!ipv4_is_multicast(addr))
2277 return -EINVAL;
2278
2279 rtnl_lock();
2280
2281 err = -EADDRNOTAVAIL;
2282
2283 for_each_pmc_rtnl(inet, pmc) {
2284 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2285 pmc->multi.imr_ifindex == gsf->gf_interface)
2286 break;
2287 }
2288 if (!pmc) /* must have a prior join */
2289 goto done;
2290 gsf->gf_fmode = pmc->sfmode;
2291 psl = rtnl_dereference(pmc->sflist);
2292 rtnl_unlock();
2293 count = psl ? psl->sl_count : 0;
2294 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2295 gsf->gf_numsrc = count;
2296 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2297 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2298 return -EFAULT;
2299 }
2300 for (i = 0; i < copycount; i++) {
2301 struct sockaddr_storage ss;
2302
2303 psin = (struct sockaddr_in *)&ss;
2304 memset(&ss, 0, sizeof(ss));
2305 psin->sin_family = AF_INET;
2306 psin->sin_addr.s_addr = psl->sl_addr[i];
2307 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2308 return -EFAULT;
2309 }
2310 return 0;
2311 done:
2312 rtnl_unlock();
2313 return err;
2314 }
2315
2316 /*
2317 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2318 */
2319 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2320 {
2321 struct inet_sock *inet = inet_sk(sk);
2322 struct ip_mc_socklist *pmc;
2323 struct ip_sf_socklist *psl;
2324 int i;
2325 int ret;
2326
2327 ret = 1;
2328 if (!ipv4_is_multicast(loc_addr))
2329 goto out;
2330
2331 rcu_read_lock();
2332 for_each_pmc_rcu(inet, pmc) {
2333 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2334 pmc->multi.imr_ifindex == dif)
2335 break;
2336 }
2337 ret = inet->mc_all;
2338 if (!pmc)
2339 goto unlock;
2340 psl = rcu_dereference(pmc->sflist);
2341 ret = (pmc->sfmode == MCAST_EXCLUDE);
2342 if (!psl)
2343 goto unlock;
2344
2345 for (i = 0; i < psl->sl_count; i++) {
2346 if (psl->sl_addr[i] == rmt_addr)
2347 break;
2348 }
2349 ret = 0;
2350 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2351 goto unlock;
2352 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2353 goto unlock;
2354 ret = 1;
2355 unlock:
2356 rcu_read_unlock();
2357 out:
2358 return ret;
2359 }
2360
2361 /*
2362 * A socket is closing.
2363 */
2364
2365 void ip_mc_drop_socket(struct sock *sk)
2366 {
2367 struct inet_sock *inet = inet_sk(sk);
2368 struct ip_mc_socklist *iml;
2369 struct net *net = sock_net(sk);
2370
2371 if (inet->mc_list == NULL)
2372 return;
2373
2374 rtnl_lock();
2375 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2376 struct in_device *in_dev;
2377
2378 inet->mc_list = iml->next_rcu;
2379 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2380 (void) ip_mc_leave_src(sk, iml, in_dev);
2381 if (in_dev != NULL)
2382 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2383 /* decrease mem now to avoid the memleak warning */
2384 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2385 kfree_rcu(iml, rcu);
2386 }
2387 rtnl_unlock();
2388 }
2389
2390 /* called with rcu_read_lock() */
2391 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2392 {
2393 struct ip_mc_list *im;
2394 struct ip_mc_list __rcu **mc_hash;
2395 struct ip_sf_list *psf;
2396 int rv = 0;
2397
2398 mc_hash = rcu_dereference(in_dev->mc_hash);
2399 if (mc_hash) {
2400 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2401
2402 for (im = rcu_dereference(mc_hash[hash]);
2403 im != NULL;
2404 im = rcu_dereference(im->next_hash)) {
2405 if (im->multiaddr == mc_addr)
2406 break;
2407 }
2408 } else {
2409 for_each_pmc_rcu(in_dev, im) {
2410 if (im->multiaddr == mc_addr)
2411 break;
2412 }
2413 }
2414 if (im && proto == IPPROTO_IGMP) {
2415 rv = 1;
2416 } else if (im) {
2417 if (src_addr) {
2418 for (psf = im->sources; psf; psf = psf->sf_next) {
2419 if (psf->sf_inaddr == src_addr)
2420 break;
2421 }
2422 if (psf)
2423 rv = psf->sf_count[MCAST_INCLUDE] ||
2424 psf->sf_count[MCAST_EXCLUDE] !=
2425 im->sfcount[MCAST_EXCLUDE];
2426 else
2427 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2428 } else
2429 rv = 1; /* unspecified source; tentatively allow */
2430 }
2431 return rv;
2432 }
2433
2434 #if defined(CONFIG_PROC_FS)
2435 struct igmp_mc_iter_state {
2436 struct seq_net_private p;
2437 struct net_device *dev;
2438 struct in_device *in_dev;
2439 };
2440
2441 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2442
2443 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2444 {
2445 struct net *net = seq_file_net(seq);
2446 struct ip_mc_list *im = NULL;
2447 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2448
2449 state->in_dev = NULL;
2450 for_each_netdev_rcu(net, state->dev) {
2451 struct in_device *in_dev;
2452
2453 in_dev = __in_dev_get_rcu(state->dev);
2454 if (!in_dev)
2455 continue;
2456 im = rcu_dereference(in_dev->mc_list);
2457 if (im) {
2458 state->in_dev = in_dev;
2459 break;
2460 }
2461 }
2462 return im;
2463 }
2464
2465 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2466 {
2467 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2468
2469 im = rcu_dereference(im->next_rcu);
2470 while (!im) {
2471 state->dev = next_net_device_rcu(state->dev);
2472 if (!state->dev) {
2473 state->in_dev = NULL;
2474 break;
2475 }
2476 state->in_dev = __in_dev_get_rcu(state->dev);
2477 if (!state->in_dev)
2478 continue;
2479 im = rcu_dereference(state->in_dev->mc_list);
2480 }
2481 return im;
2482 }
2483
2484 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2485 {
2486 struct ip_mc_list *im = igmp_mc_get_first(seq);
2487 if (im)
2488 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2489 --pos;
2490 return pos ? NULL : im;
2491 }
2492
2493 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2494 __acquires(rcu)
2495 {
2496 rcu_read_lock();
2497 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2498 }
2499
2500 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2501 {
2502 struct ip_mc_list *im;
2503 if (v == SEQ_START_TOKEN)
2504 im = igmp_mc_get_first(seq);
2505 else
2506 im = igmp_mc_get_next(seq, v);
2507 ++*pos;
2508 return im;
2509 }
2510
2511 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2512 __releases(rcu)
2513 {
2514 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2515
2516 state->in_dev = NULL;
2517 state->dev = NULL;
2518 rcu_read_unlock();
2519 }
2520
2521 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2522 {
2523 if (v == SEQ_START_TOKEN)
2524 seq_puts(seq,
2525 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2526 else {
2527 struct ip_mc_list *im = (struct ip_mc_list *)v;
2528 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2529 char *querier;
2530 long delta;
2531
2532 #ifdef CONFIG_IP_MULTICAST
2533 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2534 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2535 "V3";
2536 #else
2537 querier = "NONE";
2538 #endif
2539
2540 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2541 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2542 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2543 }
2544
2545 delta = im->timer.expires - jiffies;
2546 seq_printf(seq,
2547 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2548 im->multiaddr, im->users,
2549 im->tm_running,
2550 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2551 im->reporter);
2552 }
2553 return 0;
2554 }
2555
2556 static const struct seq_operations igmp_mc_seq_ops = {
2557 .start = igmp_mc_seq_start,
2558 .next = igmp_mc_seq_next,
2559 .stop = igmp_mc_seq_stop,
2560 .show = igmp_mc_seq_show,
2561 };
2562
2563 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2564 {
2565 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2566 sizeof(struct igmp_mc_iter_state));
2567 }
2568
2569 static const struct file_operations igmp_mc_seq_fops = {
2570 .owner = THIS_MODULE,
2571 .open = igmp_mc_seq_open,
2572 .read = seq_read,
2573 .llseek = seq_lseek,
2574 .release = seq_release_net,
2575 };
2576
2577 struct igmp_mcf_iter_state {
2578 struct seq_net_private p;
2579 struct net_device *dev;
2580 struct in_device *idev;
2581 struct ip_mc_list *im;
2582 };
2583
2584 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2585
2586 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2587 {
2588 struct net *net = seq_file_net(seq);
2589 struct ip_sf_list *psf = NULL;
2590 struct ip_mc_list *im = NULL;
2591 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2592
2593 state->idev = NULL;
2594 state->im = NULL;
2595 for_each_netdev_rcu(net, state->dev) {
2596 struct in_device *idev;
2597 idev = __in_dev_get_rcu(state->dev);
2598 if (unlikely(idev == NULL))
2599 continue;
2600 im = rcu_dereference(idev->mc_list);
2601 if (likely(im != NULL)) {
2602 spin_lock_bh(&im->lock);
2603 psf = im->sources;
2604 if (likely(psf != NULL)) {
2605 state->im = im;
2606 state->idev = idev;
2607 break;
2608 }
2609 spin_unlock_bh(&im->lock);
2610 }
2611 }
2612 return psf;
2613 }
2614
2615 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2616 {
2617 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2618
2619 psf = psf->sf_next;
2620 while (!psf) {
2621 spin_unlock_bh(&state->im->lock);
2622 state->im = state->im->next;
2623 while (!state->im) {
2624 state->dev = next_net_device_rcu(state->dev);
2625 if (!state->dev) {
2626 state->idev = NULL;
2627 goto out;
2628 }
2629 state->idev = __in_dev_get_rcu(state->dev);
2630 if (!state->idev)
2631 continue;
2632 state->im = rcu_dereference(state->idev->mc_list);
2633 }
2634 if (!state->im)
2635 break;
2636 spin_lock_bh(&state->im->lock);
2637 psf = state->im->sources;
2638 }
2639 out:
2640 return psf;
2641 }
2642
2643 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2644 {
2645 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2646 if (psf)
2647 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2648 --pos;
2649 return pos ? NULL : psf;
2650 }
2651
2652 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2653 __acquires(rcu)
2654 {
2655 rcu_read_lock();
2656 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2657 }
2658
2659 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2660 {
2661 struct ip_sf_list *psf;
2662 if (v == SEQ_START_TOKEN)
2663 psf = igmp_mcf_get_first(seq);
2664 else
2665 psf = igmp_mcf_get_next(seq, v);
2666 ++*pos;
2667 return psf;
2668 }
2669
2670 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2671 __releases(rcu)
2672 {
2673 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2674 if (likely(state->im != NULL)) {
2675 spin_unlock_bh(&state->im->lock);
2676 state->im = NULL;
2677 }
2678 state->idev = NULL;
2679 state->dev = NULL;
2680 rcu_read_unlock();
2681 }
2682
2683 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2684 {
2685 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2686 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2687
2688 if (v == SEQ_START_TOKEN) {
2689 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2690 } else {
2691 seq_printf(seq,
2692 "%3d %6.6s 0x%08x "
2693 "0x%08x %6lu %6lu\n",
2694 state->dev->ifindex, state->dev->name,
2695 ntohl(state->im->multiaddr),
2696 ntohl(psf->sf_inaddr),
2697 psf->sf_count[MCAST_INCLUDE],
2698 psf->sf_count[MCAST_EXCLUDE]);
2699 }
2700 return 0;
2701 }
2702
2703 static const struct seq_operations igmp_mcf_seq_ops = {
2704 .start = igmp_mcf_seq_start,
2705 .next = igmp_mcf_seq_next,
2706 .stop = igmp_mcf_seq_stop,
2707 .show = igmp_mcf_seq_show,
2708 };
2709
2710 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2711 {
2712 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2713 sizeof(struct igmp_mcf_iter_state));
2714 }
2715
2716 static const struct file_operations igmp_mcf_seq_fops = {
2717 .owner = THIS_MODULE,
2718 .open = igmp_mcf_seq_open,
2719 .read = seq_read,
2720 .llseek = seq_lseek,
2721 .release = seq_release_net,
2722 };
2723
2724 static int __net_init igmp_net_init(struct net *net)
2725 {
2726 struct proc_dir_entry *pde;
2727
2728 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2729 if (!pde)
2730 goto out_igmp;
2731 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2732 &igmp_mcf_seq_fops);
2733 if (!pde)
2734 goto out_mcfilter;
2735 return 0;
2736
2737 out_mcfilter:
2738 remove_proc_entry("igmp", net->proc_net);
2739 out_igmp:
2740 return -ENOMEM;
2741 }
2742
2743 static void __net_exit igmp_net_exit(struct net *net)
2744 {
2745 remove_proc_entry("mcfilter", net->proc_net);
2746 remove_proc_entry("igmp", net->proc_net);
2747 }
2748
2749 static struct pernet_operations igmp_net_ops = {
2750 .init = igmp_net_init,
2751 .exit = igmp_net_exit,
2752 };
2753 #endif
2754
2755 static int igmp_netdev_event(struct notifier_block *this,
2756 unsigned long event, void *ptr)
2757 {
2758 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2759 struct in_device *in_dev;
2760
2761 switch (event) {
2762 case NETDEV_RESEND_IGMP:
2763 in_dev = __in_dev_get_rtnl(dev);
2764 if (in_dev)
2765 ip_mc_rejoin_groups(in_dev);
2766 break;
2767 default:
2768 break;
2769 }
2770 return NOTIFY_DONE;
2771 }
2772
2773 static struct notifier_block igmp_notifier = {
2774 .notifier_call = igmp_netdev_event,
2775 };
2776
2777 int __init igmp_mc_init(void)
2778 {
2779 #if defined(CONFIG_PROC_FS)
2780 int err;
2781
2782 err = register_pernet_subsys(&igmp_net_ops);
2783 if (err)
2784 return err;
2785 err = register_netdevice_notifier(&igmp_notifier);
2786 if (err)
2787 goto reg_notif_fail;
2788 return 0;
2789
2790 reg_notif_fail:
2791 unregister_pernet_subsys(&igmp_net_ops);
2792 return err;
2793 #else
2794 return register_netdevice_notifier(&igmp_notifier);
2795 #endif
2796 }
Linux with added FPC-III support