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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / net / ipv4 / igmp.c
blob218abf9fb1ed91d91cef124bd46216151104c910
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 <net/inet_common.h>
101 #include <linux/netfilter_ipv4.h>
102 #ifdef CONFIG_IP_MROUTE
103 #include <linux/mroute.h>
104 #endif
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
108 #endif
109
110 #define IP_MAX_MEMBERSHIPS 20
111 #define IP_MAX_MSF 10
112
113 #ifdef CONFIG_IP_MULTICAST
114 /* Parameter names and values are taken from igmp-v2-06 draft */
115
116 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
117 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
118 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
119 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
120 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
121 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
122
123
124 #define IGMP_INITIAL_REPORT_DELAY (1)
125
126 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
127 * IGMP specs require to report membership immediately after
128 * joining a group, but we delay the first report by a
129 * small interval. It seems more natural and still does not
130 * contradict to specs provided this delay is small enough.
131 */
132
133 #define IGMP_V1_SEEN(in_dev) \
134 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
135 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
136 ((in_dev)->mr_v1_seen && \
137 time_before(jiffies, (in_dev)->mr_v1_seen)))
138 #define IGMP_V2_SEEN(in_dev) \
139 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
140 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
141 ((in_dev)->mr_v2_seen && \
142 time_before(jiffies, (in_dev)->mr_v2_seen)))
143
144 static int unsolicited_report_interval(struct in_device *in_dev)
145 {
146 int interval_ms, interval_jiffies;
147
148 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
149 interval_ms = IN_DEV_CONF_GET(
150 in_dev,
151 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
152 else /* v3 */
153 interval_ms = IN_DEV_CONF_GET(
154 in_dev,
155 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
156
157 interval_jiffies = msecs_to_jiffies(interval_ms);
158
159 /* _timer functions can't handle a delay of 0 jiffies so ensure
160 * we always return a positive value.
161 */
162 if (interval_jiffies <= 0)
163 interval_jiffies = 1;
164 return interval_jiffies;
165 }
166
167 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
168 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
169 static void igmpv3_clear_delrec(struct in_device *in_dev);
170 static int sf_setstate(struct ip_mc_list *pmc);
171 static void sf_markstate(struct ip_mc_list *pmc);
172 #endif
173 static void ip_mc_clear_src(struct ip_mc_list *pmc);
174 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
175 int sfcount, __be32 *psfsrc, int delta);
176
177 static void ip_ma_put(struct ip_mc_list *im)
178 {
179 if (atomic_dec_and_test(&im->refcnt)) {
180 in_dev_put(im->interface);
181 kfree_rcu(im, rcu);
182 }
183 }
184
185 #define for_each_pmc_rcu(in_dev, pmc) \
186 for (pmc = rcu_dereference(in_dev->mc_list); \
187 pmc != NULL; \
188 pmc = rcu_dereference(pmc->next_rcu))
189
190 #define for_each_pmc_rtnl(in_dev, pmc) \
191 for (pmc = rtnl_dereference(in_dev->mc_list); \
192 pmc != NULL; \
193 pmc = rtnl_dereference(pmc->next_rcu))
194
195 #ifdef CONFIG_IP_MULTICAST
196
197 /*
198 * Timer management
199 */
200
201 static void igmp_stop_timer(struct ip_mc_list *im)
202 {
203 spin_lock_bh(&im->lock);
204 if (del_timer(&im->timer))
205 atomic_dec(&im->refcnt);
206 im->tm_running = 0;
207 im->reporter = 0;
208 im->unsolicit_count = 0;
209 spin_unlock_bh(&im->lock);
210 }
211
212 /* It must be called with locked im->lock */
213 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
214 {
215 int tv = prandom_u32() % max_delay;
216
217 im->tm_running = 1;
218 if (!mod_timer(&im->timer, jiffies+tv+2))
219 atomic_inc(&im->refcnt);
220 }
221
222 static void igmp_gq_start_timer(struct in_device *in_dev)
223 {
224 int tv = prandom_u32() % in_dev->mr_maxdelay;
225
226 in_dev->mr_gq_running = 1;
227 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
228 in_dev_hold(in_dev);
229 }
230
231 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
232 {
233 int tv = prandom_u32() % delay;
234
235 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
236 in_dev_hold(in_dev);
237 }
238
239 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
240 {
241 spin_lock_bh(&im->lock);
242 im->unsolicit_count = 0;
243 if (del_timer(&im->timer)) {
244 if ((long)(im->timer.expires-jiffies) < max_delay) {
245 add_timer(&im->timer);
246 im->tm_running = 1;
247 spin_unlock_bh(&im->lock);
248 return;
249 }
250 atomic_dec(&im->refcnt);
251 }
252 igmp_start_timer(im, max_delay);
253 spin_unlock_bh(&im->lock);
254 }
255
256
257 /*
258 * Send an IGMP report.
259 */
260
261 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
262
263
264 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
265 int gdeleted, int sdeleted)
266 {
267 switch (type) {
268 case IGMPV3_MODE_IS_INCLUDE:
269 case IGMPV3_MODE_IS_EXCLUDE:
270 if (gdeleted || sdeleted)
271 return 0;
272 if (!(pmc->gsquery && !psf->sf_gsresp)) {
273 if (pmc->sfmode == MCAST_INCLUDE)
274 return 1;
275 /* don't include if this source is excluded
276 * in all filters
277 */
278 if (psf->sf_count[MCAST_INCLUDE])
279 return type == IGMPV3_MODE_IS_INCLUDE;
280 return pmc->sfcount[MCAST_EXCLUDE] ==
281 psf->sf_count[MCAST_EXCLUDE];
282 }
283 return 0;
284 case IGMPV3_CHANGE_TO_INCLUDE:
285 if (gdeleted || sdeleted)
286 return 0;
287 return psf->sf_count[MCAST_INCLUDE] != 0;
288 case IGMPV3_CHANGE_TO_EXCLUDE:
289 if (gdeleted || sdeleted)
290 return 0;
291 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
292 psf->sf_count[MCAST_INCLUDE])
293 return 0;
294 return pmc->sfcount[MCAST_EXCLUDE] ==
295 psf->sf_count[MCAST_EXCLUDE];
296 case IGMPV3_ALLOW_NEW_SOURCES:
297 if (gdeleted || !psf->sf_crcount)
298 return 0;
299 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
300 case IGMPV3_BLOCK_OLD_SOURCES:
301 if (pmc->sfmode == MCAST_INCLUDE)
302 return gdeleted || (psf->sf_crcount && sdeleted);
303 return psf->sf_crcount && !gdeleted && !sdeleted;
304 }
305 return 0;
306 }
307
308 static int
309 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
310 {
311 struct ip_sf_list *psf;
312 int scount = 0;
313
314 for (psf = pmc->sources; psf; psf = psf->sf_next) {
315 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
316 continue;
317 scount++;
318 }
319 return scount;
320 }
321
322 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
323 {
324 struct sk_buff *skb;
325 struct rtable *rt;
326 struct iphdr *pip;
327 struct igmpv3_report *pig;
328 struct net *net = dev_net(dev);
329 struct flowi4 fl4;
330 int hlen = LL_RESERVED_SPACE(dev);
331 int tlen = dev->needed_tailroom;
332 unsigned int size = mtu;
333
334 while (1) {
335 skb = alloc_skb(size + hlen + tlen,
336 GFP_ATOMIC | __GFP_NOWARN);
337 if (skb)
338 break;
339 size >>= 1;
340 if (size < 256)
341 return NULL;
342 }
343 skb->priority = TC_PRIO_CONTROL;
344
345 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
346 0, 0,
347 IPPROTO_IGMP, 0, dev->ifindex);
348 if (IS_ERR(rt)) {
349 kfree_skb(skb);
350 return NULL;
351 }
352
353 skb_dst_set(skb, &rt->dst);
354 skb->dev = dev;
355
356 skb_reserve(skb, hlen);
357 skb_tailroom_reserve(skb, mtu, tlen);
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(net, 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) {
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(net, 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)
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 /* Join a multicast group
1853 */
1854
1855 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
1856 {
1857 __be32 addr = imr->imr_multiaddr.s_addr;
1858 struct ip_mc_socklist *iml, *i;
1859 struct in_device *in_dev;
1860 struct inet_sock *inet = inet_sk(sk);
1861 struct net *net = sock_net(sk);
1862 int ifindex;
1863 int count = 0;
1864 int err;
1865
1866 ASSERT_RTNL();
1867
1868 if (!ipv4_is_multicast(addr))
1869 return -EINVAL;
1870
1871 in_dev = ip_mc_find_dev(net, imr);
1872
1873 if (!in_dev) {
1874 err = -ENODEV;
1875 goto done;
1876 }
1877
1878 err = -EADDRINUSE;
1879 ifindex = imr->imr_ifindex;
1880 for_each_pmc_rtnl(inet, i) {
1881 if (i->multi.imr_multiaddr.s_addr == addr &&
1882 i->multi.imr_ifindex == ifindex)
1883 goto done;
1884 count++;
1885 }
1886 err = -ENOBUFS;
1887 if (count >= sysctl_igmp_max_memberships)
1888 goto done;
1889 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1890 if (!iml)
1891 goto done;
1892
1893 memcpy(&iml->multi, imr, sizeof(*imr));
1894 iml->next_rcu = inet->mc_list;
1895 iml->sflist = NULL;
1896 iml->sfmode = MCAST_EXCLUDE;
1897 rcu_assign_pointer(inet->mc_list, iml);
1898 ip_mc_inc_group(in_dev, addr);
1899 err = 0;
1900 done:
1901 return err;
1902 }
1903 EXPORT_SYMBOL(ip_mc_join_group);
1904
1905 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1906 struct in_device *in_dev)
1907 {
1908 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1909 int err;
1910
1911 if (!psf) {
1912 /* any-source empty exclude case */
1913 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1914 iml->sfmode, 0, NULL, 0);
1915 }
1916 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1917 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1918 RCU_INIT_POINTER(iml->sflist, NULL);
1919 /* decrease mem now to avoid the memleak warning */
1920 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1921 kfree_rcu(psf, rcu);
1922 return err;
1923 }
1924
1925 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1926 {
1927 struct inet_sock *inet = inet_sk(sk);
1928 struct ip_mc_socklist *iml;
1929 struct ip_mc_socklist __rcu **imlp;
1930 struct in_device *in_dev;
1931 struct net *net = sock_net(sk);
1932 __be32 group = imr->imr_multiaddr.s_addr;
1933 u32 ifindex;
1934 int ret = -EADDRNOTAVAIL;
1935
1936 ASSERT_RTNL();
1937
1938 in_dev = ip_mc_find_dev(net, imr);
1939 if (!in_dev) {
1940 ret = -ENODEV;
1941 goto out;
1942 }
1943 ifindex = imr->imr_ifindex;
1944 for (imlp = &inet->mc_list;
1945 (iml = rtnl_dereference(*imlp)) != NULL;
1946 imlp = &iml->next_rcu) {
1947 if (iml->multi.imr_multiaddr.s_addr != group)
1948 continue;
1949 if (ifindex) {
1950 if (iml->multi.imr_ifindex != ifindex)
1951 continue;
1952 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1953 iml->multi.imr_address.s_addr)
1954 continue;
1955
1956 (void) ip_mc_leave_src(sk, iml, in_dev);
1957
1958 *imlp = iml->next_rcu;
1959
1960 ip_mc_dec_group(in_dev, group);
1961
1962 /* decrease mem now to avoid the memleak warning */
1963 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1964 kfree_rcu(iml, rcu);
1965 return 0;
1966 }
1967 out:
1968 return ret;
1969 }
1970 EXPORT_SYMBOL(ip_mc_leave_group);
1971
1972 int ip_mc_source(int add, int omode, struct sock *sk, struct
1973 ip_mreq_source *mreqs, int ifindex)
1974 {
1975 int err;
1976 struct ip_mreqn imr;
1977 __be32 addr = mreqs->imr_multiaddr;
1978 struct ip_mc_socklist *pmc;
1979 struct in_device *in_dev = NULL;
1980 struct inet_sock *inet = inet_sk(sk);
1981 struct ip_sf_socklist *psl;
1982 struct net *net = sock_net(sk);
1983 int leavegroup = 0;
1984 int i, j, rv;
1985
1986 if (!ipv4_is_multicast(addr))
1987 return -EINVAL;
1988
1989 ASSERT_RTNL();
1990
1991 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1992 imr.imr_address.s_addr = mreqs->imr_interface;
1993 imr.imr_ifindex = ifindex;
1994 in_dev = ip_mc_find_dev(net, &imr);
1995
1996 if (!in_dev) {
1997 err = -ENODEV;
1998 goto done;
1999 }
2000 err = -EADDRNOTAVAIL;
2001
2002 for_each_pmc_rtnl(inet, pmc) {
2003 if ((pmc->multi.imr_multiaddr.s_addr ==
2004 imr.imr_multiaddr.s_addr) &&
2005 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2006 break;
2007 }
2008 if (!pmc) { /* must have a prior join */
2009 err = -EINVAL;
2010 goto done;
2011 }
2012 /* if a source filter was set, must be the same mode as before */
2013 if (pmc->sflist) {
2014 if (pmc->sfmode != omode) {
2015 err = -EINVAL;
2016 goto done;
2017 }
2018 } else if (pmc->sfmode != omode) {
2019 /* allow mode switches for empty-set filters */
2020 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2021 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2022 NULL, 0);
2023 pmc->sfmode = omode;
2024 }
2025
2026 psl = rtnl_dereference(pmc->sflist);
2027 if (!add) {
2028 if (!psl)
2029 goto done; /* err = -EADDRNOTAVAIL */
2030 rv = !0;
2031 for (i = 0; i < psl->sl_count; i++) {
2032 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2033 sizeof(__be32));
2034 if (rv == 0)
2035 break;
2036 }
2037 if (rv) /* source not found */
2038 goto done; /* err = -EADDRNOTAVAIL */
2039
2040 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2041 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2042 leavegroup = 1;
2043 goto done;
2044 }
2045
2046 /* update the interface filter */
2047 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2048 &mreqs->imr_sourceaddr, 1);
2049
2050 for (j = i+1; j < psl->sl_count; j++)
2051 psl->sl_addr[j-1] = psl->sl_addr[j];
2052 psl->sl_count--;
2053 err = 0;
2054 goto done;
2055 }
2056 /* else, add a new source to the filter */
2057
2058 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2059 err = -ENOBUFS;
2060 goto done;
2061 }
2062 if (!psl || psl->sl_count == psl->sl_max) {
2063 struct ip_sf_socklist *newpsl;
2064 int count = IP_SFBLOCK;
2065
2066 if (psl)
2067 count += psl->sl_max;
2068 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2069 if (!newpsl) {
2070 err = -ENOBUFS;
2071 goto done;
2072 }
2073 newpsl->sl_max = count;
2074 newpsl->sl_count = count - IP_SFBLOCK;
2075 if (psl) {
2076 for (i = 0; i < psl->sl_count; i++)
2077 newpsl->sl_addr[i] = psl->sl_addr[i];
2078 /* decrease mem now to avoid the memleak warning */
2079 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2080 kfree_rcu(psl, rcu);
2081 }
2082 rcu_assign_pointer(pmc->sflist, newpsl);
2083 psl = newpsl;
2084 }
2085 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2086 for (i = 0; i < psl->sl_count; i++) {
2087 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2088 sizeof(__be32));
2089 if (rv == 0)
2090 break;
2091 }
2092 if (rv == 0) /* address already there is an error */
2093 goto done;
2094 for (j = psl->sl_count-1; j >= i; j--)
2095 psl->sl_addr[j+1] = psl->sl_addr[j];
2096 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2097 psl->sl_count++;
2098 err = 0;
2099 /* update the interface list */
2100 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2101 &mreqs->imr_sourceaddr, 1);
2102 done:
2103 if (leavegroup)
2104 err = ip_mc_leave_group(sk, &imr);
2105 return err;
2106 }
2107
2108 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2109 {
2110 int err = 0;
2111 struct ip_mreqn imr;
2112 __be32 addr = msf->imsf_multiaddr;
2113 struct ip_mc_socklist *pmc;
2114 struct in_device *in_dev;
2115 struct inet_sock *inet = inet_sk(sk);
2116 struct ip_sf_socklist *newpsl, *psl;
2117 struct net *net = sock_net(sk);
2118 int leavegroup = 0;
2119
2120 if (!ipv4_is_multicast(addr))
2121 return -EINVAL;
2122 if (msf->imsf_fmode != MCAST_INCLUDE &&
2123 msf->imsf_fmode != MCAST_EXCLUDE)
2124 return -EINVAL;
2125
2126 ASSERT_RTNL();
2127
2128 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2129 imr.imr_address.s_addr = msf->imsf_interface;
2130 imr.imr_ifindex = ifindex;
2131 in_dev = ip_mc_find_dev(net, &imr);
2132
2133 if (!in_dev) {
2134 err = -ENODEV;
2135 goto done;
2136 }
2137
2138 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2139 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2140 leavegroup = 1;
2141 goto done;
2142 }
2143
2144 for_each_pmc_rtnl(inet, pmc) {
2145 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2146 pmc->multi.imr_ifindex == imr.imr_ifindex)
2147 break;
2148 }
2149 if (!pmc) { /* must have a prior join */
2150 err = -EINVAL;
2151 goto done;
2152 }
2153 if (msf->imsf_numsrc) {
2154 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2155 GFP_KERNEL);
2156 if (!newpsl) {
2157 err = -ENOBUFS;
2158 goto done;
2159 }
2160 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2161 memcpy(newpsl->sl_addr, msf->imsf_slist,
2162 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2163 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2164 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2165 if (err) {
2166 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2167 goto done;
2168 }
2169 } else {
2170 newpsl = NULL;
2171 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2172 msf->imsf_fmode, 0, NULL, 0);
2173 }
2174 psl = rtnl_dereference(pmc->sflist);
2175 if (psl) {
2176 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2177 psl->sl_count, psl->sl_addr, 0);
2178 /* decrease mem now to avoid the memleak warning */
2179 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2180 kfree_rcu(psl, rcu);
2181 } else
2182 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2183 0, NULL, 0);
2184 rcu_assign_pointer(pmc->sflist, newpsl);
2185 pmc->sfmode = msf->imsf_fmode;
2186 err = 0;
2187 done:
2188 if (leavegroup)
2189 err = ip_mc_leave_group(sk, &imr);
2190 return err;
2191 }
2192
2193 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2194 struct ip_msfilter __user *optval, int __user *optlen)
2195 {
2196 int err, len, count, copycount;
2197 struct ip_mreqn imr;
2198 __be32 addr = msf->imsf_multiaddr;
2199 struct ip_mc_socklist *pmc;
2200 struct in_device *in_dev;
2201 struct inet_sock *inet = inet_sk(sk);
2202 struct ip_sf_socklist *psl;
2203 struct net *net = sock_net(sk);
2204
2205 if (!ipv4_is_multicast(addr))
2206 return -EINVAL;
2207
2208 rtnl_lock();
2209
2210 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2211 imr.imr_address.s_addr = msf->imsf_interface;
2212 imr.imr_ifindex = 0;
2213 in_dev = ip_mc_find_dev(net, &imr);
2214
2215 if (!in_dev) {
2216 err = -ENODEV;
2217 goto done;
2218 }
2219 err = -EADDRNOTAVAIL;
2220
2221 for_each_pmc_rtnl(inet, pmc) {
2222 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2223 pmc->multi.imr_ifindex == imr.imr_ifindex)
2224 break;
2225 }
2226 if (!pmc) /* must have a prior join */
2227 goto done;
2228 msf->imsf_fmode = pmc->sfmode;
2229 psl = rtnl_dereference(pmc->sflist);
2230 rtnl_unlock();
2231 if (!psl) {
2232 len = 0;
2233 count = 0;
2234 } else {
2235 count = psl->sl_count;
2236 }
2237 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2238 len = copycount * sizeof(psl->sl_addr[0]);
2239 msf->imsf_numsrc = count;
2240 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2241 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2242 return -EFAULT;
2243 }
2244 if (len &&
2245 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2246 return -EFAULT;
2247 return 0;
2248 done:
2249 rtnl_unlock();
2250 return err;
2251 }
2252
2253 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2254 struct group_filter __user *optval, int __user *optlen)
2255 {
2256 int err, i, count, copycount;
2257 struct sockaddr_in *psin;
2258 __be32 addr;
2259 struct ip_mc_socklist *pmc;
2260 struct inet_sock *inet = inet_sk(sk);
2261 struct ip_sf_socklist *psl;
2262
2263 psin = (struct sockaddr_in *)&gsf->gf_group;
2264 if (psin->sin_family != AF_INET)
2265 return -EINVAL;
2266 addr = psin->sin_addr.s_addr;
2267 if (!ipv4_is_multicast(addr))
2268 return -EINVAL;
2269
2270 rtnl_lock();
2271
2272 err = -EADDRNOTAVAIL;
2273
2274 for_each_pmc_rtnl(inet, pmc) {
2275 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2276 pmc->multi.imr_ifindex == gsf->gf_interface)
2277 break;
2278 }
2279 if (!pmc) /* must have a prior join */
2280 goto done;
2281 gsf->gf_fmode = pmc->sfmode;
2282 psl = rtnl_dereference(pmc->sflist);
2283 rtnl_unlock();
2284 count = psl ? psl->sl_count : 0;
2285 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2286 gsf->gf_numsrc = count;
2287 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2288 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2289 return -EFAULT;
2290 }
2291 for (i = 0; i < copycount; i++) {
2292 struct sockaddr_storage ss;
2293
2294 psin = (struct sockaddr_in *)&ss;
2295 memset(&ss, 0, sizeof(ss));
2296 psin->sin_family = AF_INET;
2297 psin->sin_addr.s_addr = psl->sl_addr[i];
2298 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2299 return -EFAULT;
2300 }
2301 return 0;
2302 done:
2303 rtnl_unlock();
2304 return err;
2305 }
2306
2307 /*
2308 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2309 */
2310 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2311 {
2312 struct inet_sock *inet = inet_sk(sk);
2313 struct ip_mc_socklist *pmc;
2314 struct ip_sf_socklist *psl;
2315 int i;
2316 int ret;
2317
2318 ret = 1;
2319 if (!ipv4_is_multicast(loc_addr))
2320 goto out;
2321
2322 rcu_read_lock();
2323 for_each_pmc_rcu(inet, pmc) {
2324 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2325 pmc->multi.imr_ifindex == dif)
2326 break;
2327 }
2328 ret = inet->mc_all;
2329 if (!pmc)
2330 goto unlock;
2331 psl = rcu_dereference(pmc->sflist);
2332 ret = (pmc->sfmode == MCAST_EXCLUDE);
2333 if (!psl)
2334 goto unlock;
2335
2336 for (i = 0; i < psl->sl_count; i++) {
2337 if (psl->sl_addr[i] == rmt_addr)
2338 break;
2339 }
2340 ret = 0;
2341 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2342 goto unlock;
2343 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2344 goto unlock;
2345 ret = 1;
2346 unlock:
2347 rcu_read_unlock();
2348 out:
2349 return ret;
2350 }
2351
2352 /*
2353 * A socket is closing.
2354 */
2355
2356 void ip_mc_drop_socket(struct sock *sk)
2357 {
2358 struct inet_sock *inet = inet_sk(sk);
2359 struct ip_mc_socklist *iml;
2360 struct net *net = sock_net(sk);
2361
2362 if (!inet->mc_list)
2363 return;
2364
2365 rtnl_lock();
2366 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2367 struct in_device *in_dev;
2368
2369 inet->mc_list = iml->next_rcu;
2370 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2371 (void) ip_mc_leave_src(sk, iml, in_dev);
2372 if (in_dev)
2373 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2374 /* decrease mem now to avoid the memleak warning */
2375 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2376 kfree_rcu(iml, rcu);
2377 }
2378 rtnl_unlock();
2379 }
2380
2381 /* called with rcu_read_lock() */
2382 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2383 {
2384 struct ip_mc_list *im;
2385 struct ip_mc_list __rcu **mc_hash;
2386 struct ip_sf_list *psf;
2387 int rv = 0;
2388
2389 mc_hash = rcu_dereference(in_dev->mc_hash);
2390 if (mc_hash) {
2391 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2392
2393 for (im = rcu_dereference(mc_hash[hash]);
2394 im != NULL;
2395 im = rcu_dereference(im->next_hash)) {
2396 if (im->multiaddr == mc_addr)
2397 break;
2398 }
2399 } else {
2400 for_each_pmc_rcu(in_dev, im) {
2401 if (im->multiaddr == mc_addr)
2402 break;
2403 }
2404 }
2405 if (im && proto == IPPROTO_IGMP) {
2406 rv = 1;
2407 } else if (im) {
2408 if (src_addr) {
2409 for (psf = im->sources; psf; psf = psf->sf_next) {
2410 if (psf->sf_inaddr == src_addr)
2411 break;
2412 }
2413 if (psf)
2414 rv = psf->sf_count[MCAST_INCLUDE] ||
2415 psf->sf_count[MCAST_EXCLUDE] !=
2416 im->sfcount[MCAST_EXCLUDE];
2417 else
2418 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2419 } else
2420 rv = 1; /* unspecified source; tentatively allow */
2421 }
2422 return rv;
2423 }
2424
2425 #if defined(CONFIG_PROC_FS)
2426 struct igmp_mc_iter_state {
2427 struct seq_net_private p;
2428 struct net_device *dev;
2429 struct in_device *in_dev;
2430 };
2431
2432 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2433
2434 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2435 {
2436 struct net *net = seq_file_net(seq);
2437 struct ip_mc_list *im = NULL;
2438 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2439
2440 state->in_dev = NULL;
2441 for_each_netdev_rcu(net, state->dev) {
2442 struct in_device *in_dev;
2443
2444 in_dev = __in_dev_get_rcu(state->dev);
2445 if (!in_dev)
2446 continue;
2447 im = rcu_dereference(in_dev->mc_list);
2448 if (im) {
2449 state->in_dev = in_dev;
2450 break;
2451 }
2452 }
2453 return im;
2454 }
2455
2456 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2457 {
2458 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2459
2460 im = rcu_dereference(im->next_rcu);
2461 while (!im) {
2462 state->dev = next_net_device_rcu(state->dev);
2463 if (!state->dev) {
2464 state->in_dev = NULL;
2465 break;
2466 }
2467 state->in_dev = __in_dev_get_rcu(state->dev);
2468 if (!state->in_dev)
2469 continue;
2470 im = rcu_dereference(state->in_dev->mc_list);
2471 }
2472 return im;
2473 }
2474
2475 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2476 {
2477 struct ip_mc_list *im = igmp_mc_get_first(seq);
2478 if (im)
2479 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2480 --pos;
2481 return pos ? NULL : im;
2482 }
2483
2484 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2485 __acquires(rcu)
2486 {
2487 rcu_read_lock();
2488 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2489 }
2490
2491 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2492 {
2493 struct ip_mc_list *im;
2494 if (v == SEQ_START_TOKEN)
2495 im = igmp_mc_get_first(seq);
2496 else
2497 im = igmp_mc_get_next(seq, v);
2498 ++*pos;
2499 return im;
2500 }
2501
2502 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2503 __releases(rcu)
2504 {
2505 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2506
2507 state->in_dev = NULL;
2508 state->dev = NULL;
2509 rcu_read_unlock();
2510 }
2511
2512 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2513 {
2514 if (v == SEQ_START_TOKEN)
2515 seq_puts(seq,
2516 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2517 else {
2518 struct ip_mc_list *im = (struct ip_mc_list *)v;
2519 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2520 char *querier;
2521 long delta;
2522
2523 #ifdef CONFIG_IP_MULTICAST
2524 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2525 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2526 "V3";
2527 #else
2528 querier = "NONE";
2529 #endif
2530
2531 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2532 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2533 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2534 }
2535
2536 delta = im->timer.expires - jiffies;
2537 seq_printf(seq,
2538 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2539 im->multiaddr, im->users,
2540 im->tm_running,
2541 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2542 im->reporter);
2543 }
2544 return 0;
2545 }
2546
2547 static const struct seq_operations igmp_mc_seq_ops = {
2548 .start = igmp_mc_seq_start,
2549 .next = igmp_mc_seq_next,
2550 .stop = igmp_mc_seq_stop,
2551 .show = igmp_mc_seq_show,
2552 };
2553
2554 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2555 {
2556 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2557 sizeof(struct igmp_mc_iter_state));
2558 }
2559
2560 static const struct file_operations igmp_mc_seq_fops = {
2561 .owner = THIS_MODULE,
2562 .open = igmp_mc_seq_open,
2563 .read = seq_read,
2564 .llseek = seq_lseek,
2565 .release = seq_release_net,
2566 };
2567
2568 struct igmp_mcf_iter_state {
2569 struct seq_net_private p;
2570 struct net_device *dev;
2571 struct in_device *idev;
2572 struct ip_mc_list *im;
2573 };
2574
2575 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2576
2577 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2578 {
2579 struct net *net = seq_file_net(seq);
2580 struct ip_sf_list *psf = NULL;
2581 struct ip_mc_list *im = NULL;
2582 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2583
2584 state->idev = NULL;
2585 state->im = NULL;
2586 for_each_netdev_rcu(net, state->dev) {
2587 struct in_device *idev;
2588 idev = __in_dev_get_rcu(state->dev);
2589 if (unlikely(!idev))
2590 continue;
2591 im = rcu_dereference(idev->mc_list);
2592 if (likely(im)) {
2593 spin_lock_bh(&im->lock);
2594 psf = im->sources;
2595 if (likely(psf)) {
2596 state->im = im;
2597 state->idev = idev;
2598 break;
2599 }
2600 spin_unlock_bh(&im->lock);
2601 }
2602 }
2603 return psf;
2604 }
2605
2606 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2607 {
2608 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2609
2610 psf = psf->sf_next;
2611 while (!psf) {
2612 spin_unlock_bh(&state->im->lock);
2613 state->im = state->im->next;
2614 while (!state->im) {
2615 state->dev = next_net_device_rcu(state->dev);
2616 if (!state->dev) {
2617 state->idev = NULL;
2618 goto out;
2619 }
2620 state->idev = __in_dev_get_rcu(state->dev);
2621 if (!state->idev)
2622 continue;
2623 state->im = rcu_dereference(state->idev->mc_list);
2624 }
2625 if (!state->im)
2626 break;
2627 spin_lock_bh(&state->im->lock);
2628 psf = state->im->sources;
2629 }
2630 out:
2631 return psf;
2632 }
2633
2634 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2635 {
2636 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2637 if (psf)
2638 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2639 --pos;
2640 return pos ? NULL : psf;
2641 }
2642
2643 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2644 __acquires(rcu)
2645 {
2646 rcu_read_lock();
2647 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2648 }
2649
2650 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2651 {
2652 struct ip_sf_list *psf;
2653 if (v == SEQ_START_TOKEN)
2654 psf = igmp_mcf_get_first(seq);
2655 else
2656 psf = igmp_mcf_get_next(seq, v);
2657 ++*pos;
2658 return psf;
2659 }
2660
2661 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2662 __releases(rcu)
2663 {
2664 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2665 if (likely(state->im)) {
2666 spin_unlock_bh(&state->im->lock);
2667 state->im = NULL;
2668 }
2669 state->idev = NULL;
2670 state->dev = NULL;
2671 rcu_read_unlock();
2672 }
2673
2674 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2675 {
2676 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2677 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2678
2679 if (v == SEQ_START_TOKEN) {
2680 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2681 } else {
2682 seq_printf(seq,
2683 "%3d %6.6s 0x%08x "
2684 "0x%08x %6lu %6lu\n",
2685 state->dev->ifindex, state->dev->name,
2686 ntohl(state->im->multiaddr),
2687 ntohl(psf->sf_inaddr),
2688 psf->sf_count[MCAST_INCLUDE],
2689 psf->sf_count[MCAST_EXCLUDE]);
2690 }
2691 return 0;
2692 }
2693
2694 static const struct seq_operations igmp_mcf_seq_ops = {
2695 .start = igmp_mcf_seq_start,
2696 .next = igmp_mcf_seq_next,
2697 .stop = igmp_mcf_seq_stop,
2698 .show = igmp_mcf_seq_show,
2699 };
2700
2701 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2702 {
2703 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2704 sizeof(struct igmp_mcf_iter_state));
2705 }
2706
2707 static const struct file_operations igmp_mcf_seq_fops = {
2708 .owner = THIS_MODULE,
2709 .open = igmp_mcf_seq_open,
2710 .read = seq_read,
2711 .llseek = seq_lseek,
2712 .release = seq_release_net,
2713 };
2714
2715 static int __net_init igmp_net_init(struct net *net)
2716 {
2717 struct proc_dir_entry *pde;
2718 int err;
2719
2720 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2721 if (!pde)
2722 goto out_igmp;
2723 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2724 &igmp_mcf_seq_fops);
2725 if (!pde)
2726 goto out_mcfilter;
2727 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2728 SOCK_DGRAM, 0, net);
2729 if (err < 0) {
2730 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2731 err);
2732 goto out_sock;
2733 }
2734
2735 return 0;
2736
2737 out_sock:
2738 remove_proc_entry("mcfilter", net->proc_net);
2739 out_mcfilter:
2740 remove_proc_entry("igmp", net->proc_net);
2741 out_igmp:
2742 return -ENOMEM;
2743 }
2744
2745 static void __net_exit igmp_net_exit(struct net *net)
2746 {
2747 remove_proc_entry("mcfilter", net->proc_net);
2748 remove_proc_entry("igmp", net->proc_net);
2749 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2750 }
2751
2752 static struct pernet_operations igmp_net_ops = {
2753 .init = igmp_net_init,
2754 .exit = igmp_net_exit,
2755 };
2756 #endif
2757
2758 static int igmp_netdev_event(struct notifier_block *this,
2759 unsigned long event, void *ptr)
2760 {
2761 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2762 struct in_device *in_dev;
2763
2764 switch (event) {
2765 case NETDEV_RESEND_IGMP:
2766 in_dev = __in_dev_get_rtnl(dev);
2767 if (in_dev)
2768 ip_mc_rejoin_groups(in_dev);
2769 break;
2770 default:
2771 break;
2772 }
2773 return NOTIFY_DONE;
2774 }
2775
2776 static struct notifier_block igmp_notifier = {
2777 .notifier_call = igmp_netdev_event,
2778 };
2779
2780 int __init igmp_mc_init(void)
2781 {
2782 #if defined(CONFIG_PROC_FS)
2783 int err;
2784
2785 err = register_pernet_subsys(&igmp_net_ops);
2786 if (err)
2787 return err;
2788 err = register_netdevice_notifier(&igmp_notifier);
2789 if (err)
2790 goto reg_notif_fail;
2791 return 0;
2792
2793 reg_notif_fail:
2794 unregister_pernet_subsys(&igmp_net_ops);
2795 return err;
2796 #else
2797 return register_netdevice_notifier(&igmp_notifier);
2798 #endif
2799 }
Linux with added FPC-III support