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ARM: dts: STi: Fix pinconf setup for STiH416 serial2
[linux-2.6.git] / net / ipv4 / igmp.c
blobcd71190d29625c11fe25aa603026cc98e0e2c34b
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
92 #include <net/net_namespace.h>
93 #include <net/arp.h>
94 #include <net/ip.h>
95 #include <net/protocol.h>
96 #include <net/route.h>
97 #include <net/sock.h>
98 #include <net/checksum.h>
99 #include <linux/netfilter_ipv4.h>
100 #ifdef CONFIG_IP_MROUTE
101 #include <linux/mroute.h>
102 #endif
103 #ifdef CONFIG_PROC_FS
104 #include <linux/proc_fs.h>
105 #include <linux/seq_file.h>
106 #endif
107
108 #define IP_MAX_MEMBERSHIPS 20
109 #define IP_MAX_MSF 10
110
111 #ifdef CONFIG_IP_MULTICAST
112 /* Parameter names and values are taken from igmp-v2-06 draft */
113
114 #define IGMP_V1_Router_Present_Timeout (400*HZ)
115 #define IGMP_V2_Router_Present_Timeout (400*HZ)
116 #define IGMP_Unsolicited_Report_Interval (10*HZ)
117 #define IGMP_Query_Response_Interval (10*HZ)
118 #define IGMP_Unsolicited_Report_Count 2
119
120
121 #define IGMP_Initial_Report_Delay (1)
122
123 /* IGMP_Initial_Report_Delay is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
128 */
129
130 #define IGMP_V1_SEEN(in_dev) \
131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135 #define IGMP_V2_SEEN(in_dev) \
136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
140
141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
143 static void igmpv3_clear_delrec(struct in_device *in_dev);
144 static int sf_setstate(struct ip_mc_list *pmc);
145 static void sf_markstate(struct ip_mc_list *pmc);
146 #endif
147 static void ip_mc_clear_src(struct ip_mc_list *pmc);
148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
149 int sfcount, __be32 *psfsrc, int delta);
150
151 static void ip_ma_put(struct ip_mc_list *im)
152 {
153 if (atomic_dec_and_test(&im->refcnt)) {
154 in_dev_put(im->interface);
155 kfree_rcu(im, rcu);
156 }
157 }
158
159 #define for_each_pmc_rcu(in_dev, pmc) \
160 for (pmc = rcu_dereference(in_dev->mc_list); \
161 pmc != NULL; \
162 pmc = rcu_dereference(pmc->next_rcu))
163
164 #define for_each_pmc_rtnl(in_dev, pmc) \
165 for (pmc = rtnl_dereference(in_dev->mc_list); \
166 pmc != NULL; \
167 pmc = rtnl_dereference(pmc->next_rcu))
168
169 #ifdef CONFIG_IP_MULTICAST
170
171 /*
172 * Timer management
173 */
174
175 static void igmp_stop_timer(struct ip_mc_list *im)
176 {
177 spin_lock_bh(&im->lock);
178 if (del_timer(&im->timer))
179 atomic_dec(&im->refcnt);
180 im->tm_running = 0;
181 im->reporter = 0;
182 im->unsolicit_count = 0;
183 spin_unlock_bh(&im->lock);
184 }
185
186 /* It must be called with locked im->lock */
187 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
188 {
189 int tv = net_random() % max_delay;
190
191 im->tm_running = 1;
192 if (!mod_timer(&im->timer, jiffies+tv+2))
193 atomic_inc(&im->refcnt);
194 }
195
196 static void igmp_gq_start_timer(struct in_device *in_dev)
197 {
198 int tv = net_random() % in_dev->mr_maxdelay;
199
200 in_dev->mr_gq_running = 1;
201 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
202 in_dev_hold(in_dev);
203 }
204
205 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
206 {
207 int tv = net_random() % delay;
208
209 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
210 in_dev_hold(in_dev);
211 }
212
213 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
214 {
215 spin_lock_bh(&im->lock);
216 im->unsolicit_count = 0;
217 if (del_timer(&im->timer)) {
218 if ((long)(im->timer.expires-jiffies) < max_delay) {
219 add_timer(&im->timer);
220 im->tm_running = 1;
221 spin_unlock_bh(&im->lock);
222 return;
223 }
224 atomic_dec(&im->refcnt);
225 }
226 igmp_start_timer(im, max_delay);
227 spin_unlock_bh(&im->lock);
228 }
229
230
231 /*
232 * Send an IGMP report.
233 */
234
235 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
236
237
238 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
239 int gdeleted, int sdeleted)
240 {
241 switch (type) {
242 case IGMPV3_MODE_IS_INCLUDE:
243 case IGMPV3_MODE_IS_EXCLUDE:
244 if (gdeleted || sdeleted)
245 return 0;
246 if (!(pmc->gsquery && !psf->sf_gsresp)) {
247 if (pmc->sfmode == MCAST_INCLUDE)
248 return 1;
249 /* don't include if this source is excluded
250 * in all filters
251 */
252 if (psf->sf_count[MCAST_INCLUDE])
253 return type == IGMPV3_MODE_IS_INCLUDE;
254 return pmc->sfcount[MCAST_EXCLUDE] ==
255 psf->sf_count[MCAST_EXCLUDE];
256 }
257 return 0;
258 case IGMPV3_CHANGE_TO_INCLUDE:
259 if (gdeleted || sdeleted)
260 return 0;
261 return psf->sf_count[MCAST_INCLUDE] != 0;
262 case IGMPV3_CHANGE_TO_EXCLUDE:
263 if (gdeleted || sdeleted)
264 return 0;
265 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
266 psf->sf_count[MCAST_INCLUDE])
267 return 0;
268 return pmc->sfcount[MCAST_EXCLUDE] ==
269 psf->sf_count[MCAST_EXCLUDE];
270 case IGMPV3_ALLOW_NEW_SOURCES:
271 if (gdeleted || !psf->sf_crcount)
272 return 0;
273 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
274 case IGMPV3_BLOCK_OLD_SOURCES:
275 if (pmc->sfmode == MCAST_INCLUDE)
276 return gdeleted || (psf->sf_crcount && sdeleted);
277 return psf->sf_crcount && !gdeleted && !sdeleted;
278 }
279 return 0;
280 }
281
282 static int
283 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
284 {
285 struct ip_sf_list *psf;
286 int scount = 0;
287
288 for (psf=pmc->sources; psf; psf=psf->sf_next) {
289 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
290 continue;
291 scount++;
292 }
293 return scount;
294 }
295
296 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
297
298 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
299 {
300 struct sk_buff *skb;
301 struct rtable *rt;
302 struct iphdr *pip;
303 struct igmpv3_report *pig;
304 struct net *net = dev_net(dev);
305 struct flowi4 fl4;
306 int hlen = LL_RESERVED_SPACE(dev);
307 int tlen = dev->needed_tailroom;
308
309 while (1) {
310 skb = alloc_skb(size + hlen + tlen,
311 GFP_ATOMIC | __GFP_NOWARN);
312 if (skb)
313 break;
314 size >>= 1;
315 if (size < 256)
316 return NULL;
317 }
318 igmp_skb_size(skb) = size;
319
320 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
321 0, 0,
322 IPPROTO_IGMP, 0, dev->ifindex);
323 if (IS_ERR(rt)) {
324 kfree_skb(skb);
325 return NULL;
326 }
327
328 skb_dst_set(skb, &rt->dst);
329 skb->dev = dev;
330
331 skb_reserve(skb, hlen);
332
333 skb_reset_network_header(skb);
334 pip = ip_hdr(skb);
335 skb_put(skb, sizeof(struct iphdr) + 4);
336
337 pip->version = 4;
338 pip->ihl = (sizeof(struct iphdr)+4)>>2;
339 pip->tos = 0xc0;
340 pip->frag_off = htons(IP_DF);
341 pip->ttl = 1;
342 pip->daddr = fl4.daddr;
343 pip->saddr = fl4.saddr;
344 pip->protocol = IPPROTO_IGMP;
345 pip->tot_len = 0; /* filled in later */
346 ip_select_ident(pip, &rt->dst, NULL);
347 ((u8 *)&pip[1])[0] = IPOPT_RA;
348 ((u8 *)&pip[1])[1] = 4;
349 ((u8 *)&pip[1])[2] = 0;
350 ((u8 *)&pip[1])[3] = 0;
351
352 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
353 skb_put(skb, sizeof(*pig));
354 pig = igmpv3_report_hdr(skb);
355 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
356 pig->resv1 = 0;
357 pig->csum = 0;
358 pig->resv2 = 0;
359 pig->ngrec = 0;
360 return skb;
361 }
362
363 static int igmpv3_sendpack(struct sk_buff *skb)
364 {
365 struct igmphdr *pig = igmp_hdr(skb);
366 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
367
368 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
369
370 return ip_local_out(skb);
371 }
372
373 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
374 {
375 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
376 }
377
378 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
379 int type, struct igmpv3_grec **ppgr)
380 {
381 struct net_device *dev = pmc->interface->dev;
382 struct igmpv3_report *pih;
383 struct igmpv3_grec *pgr;
384
385 if (!skb)
386 skb = igmpv3_newpack(dev, dev->mtu);
387 if (!skb)
388 return NULL;
389 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
390 pgr->grec_type = type;
391 pgr->grec_auxwords = 0;
392 pgr->grec_nsrcs = 0;
393 pgr->grec_mca = pmc->multiaddr;
394 pih = igmpv3_report_hdr(skb);
395 pih->ngrec = htons(ntohs(pih->ngrec)+1);
396 *ppgr = pgr;
397 return skb;
398 }
399
400 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
401 skb_tailroom(skb)) : 0)
402
403 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
404 int type, int gdeleted, int sdeleted)
405 {
406 struct net_device *dev = pmc->interface->dev;
407 struct igmpv3_report *pih;
408 struct igmpv3_grec *pgr = NULL;
409 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
410 int scount, stotal, first, isquery, truncate;
411
412 if (pmc->multiaddr == IGMP_ALL_HOSTS)
413 return skb;
414
415 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
416 type == IGMPV3_MODE_IS_EXCLUDE;
417 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
418 type == IGMPV3_CHANGE_TO_EXCLUDE;
419
420 stotal = scount = 0;
421
422 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
423
424 if (!*psf_list)
425 goto empty_source;
426
427 pih = skb ? igmpv3_report_hdr(skb) : NULL;
428
429 /* EX and TO_EX get a fresh packet, if needed */
430 if (truncate) {
431 if (pih && pih->ngrec &&
432 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
433 if (skb)
434 igmpv3_sendpack(skb);
435 skb = igmpv3_newpack(dev, dev->mtu);
436 }
437 }
438 first = 1;
439 psf_prev = NULL;
440 for (psf=*psf_list; psf; psf=psf_next) {
441 __be32 *psrc;
442
443 psf_next = psf->sf_next;
444
445 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
446 psf_prev = psf;
447 continue;
448 }
449
450 /* clear marks on query responses */
451 if (isquery)
452 psf->sf_gsresp = 0;
453
454 if (AVAILABLE(skb) < sizeof(__be32) +
455 first*sizeof(struct igmpv3_grec)) {
456 if (truncate && !first)
457 break; /* truncate these */
458 if (pgr)
459 pgr->grec_nsrcs = htons(scount);
460 if (skb)
461 igmpv3_sendpack(skb);
462 skb = igmpv3_newpack(dev, dev->mtu);
463 first = 1;
464 scount = 0;
465 }
466 if (first) {
467 skb = add_grhead(skb, pmc, type, &pgr);
468 first = 0;
469 }
470 if (!skb)
471 return NULL;
472 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
473 *psrc = psf->sf_inaddr;
474 scount++; stotal++;
475 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
476 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
477 psf->sf_crcount--;
478 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
479 if (psf_prev)
480 psf_prev->sf_next = psf->sf_next;
481 else
482 *psf_list = psf->sf_next;
483 kfree(psf);
484 continue;
485 }
486 }
487 psf_prev = psf;
488 }
489
490 empty_source:
491 if (!stotal) {
492 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
493 type == IGMPV3_BLOCK_OLD_SOURCES)
494 return skb;
495 if (pmc->crcount || isquery) {
496 /* make sure we have room for group header */
497 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
498 igmpv3_sendpack(skb);
499 skb = NULL; /* add_grhead will get a new one */
500 }
501 skb = add_grhead(skb, pmc, type, &pgr);
502 }
503 }
504 if (pgr)
505 pgr->grec_nsrcs = htons(scount);
506
507 if (isquery)
508 pmc->gsquery = 0; /* clear query state on report */
509 return skb;
510 }
511
512 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
513 {
514 struct sk_buff *skb = NULL;
515 int type;
516
517 if (!pmc) {
518 rcu_read_lock();
519 for_each_pmc_rcu(in_dev, pmc) {
520 if (pmc->multiaddr == IGMP_ALL_HOSTS)
521 continue;
522 spin_lock_bh(&pmc->lock);
523 if (pmc->sfcount[MCAST_EXCLUDE])
524 type = IGMPV3_MODE_IS_EXCLUDE;
525 else
526 type = IGMPV3_MODE_IS_INCLUDE;
527 skb = add_grec(skb, pmc, type, 0, 0);
528 spin_unlock_bh(&pmc->lock);
529 }
530 rcu_read_unlock();
531 } else {
532 spin_lock_bh(&pmc->lock);
533 if (pmc->sfcount[MCAST_EXCLUDE])
534 type = IGMPV3_MODE_IS_EXCLUDE;
535 else
536 type = IGMPV3_MODE_IS_INCLUDE;
537 skb = add_grec(skb, pmc, type, 0, 0);
538 spin_unlock_bh(&pmc->lock);
539 }
540 if (!skb)
541 return 0;
542 return igmpv3_sendpack(skb);
543 }
544
545 /*
546 * remove zero-count source records from a source filter list
547 */
548 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
549 {
550 struct ip_sf_list *psf_prev, *psf_next, *psf;
551
552 psf_prev = NULL;
553 for (psf=*ppsf; psf; psf = psf_next) {
554 psf_next = psf->sf_next;
555 if (psf->sf_crcount == 0) {
556 if (psf_prev)
557 psf_prev->sf_next = psf->sf_next;
558 else
559 *ppsf = psf->sf_next;
560 kfree(psf);
561 } else
562 psf_prev = psf;
563 }
564 }
565
566 static void igmpv3_send_cr(struct in_device *in_dev)
567 {
568 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
569 struct sk_buff *skb = NULL;
570 int type, dtype;
571
572 rcu_read_lock();
573 spin_lock_bh(&in_dev->mc_tomb_lock);
574
575 /* deleted MCA's */
576 pmc_prev = NULL;
577 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
578 pmc_next = pmc->next;
579 if (pmc->sfmode == MCAST_INCLUDE) {
580 type = IGMPV3_BLOCK_OLD_SOURCES;
581 dtype = IGMPV3_BLOCK_OLD_SOURCES;
582 skb = add_grec(skb, pmc, type, 1, 0);
583 skb = add_grec(skb, pmc, dtype, 1, 1);
584 }
585 if (pmc->crcount) {
586 if (pmc->sfmode == MCAST_EXCLUDE) {
587 type = IGMPV3_CHANGE_TO_INCLUDE;
588 skb = add_grec(skb, pmc, type, 1, 0);
589 }
590 pmc->crcount--;
591 if (pmc->crcount == 0) {
592 igmpv3_clear_zeros(&pmc->tomb);
593 igmpv3_clear_zeros(&pmc->sources);
594 }
595 }
596 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
597 if (pmc_prev)
598 pmc_prev->next = pmc_next;
599 else
600 in_dev->mc_tomb = pmc_next;
601 in_dev_put(pmc->interface);
602 kfree(pmc);
603 } else
604 pmc_prev = pmc;
605 }
606 spin_unlock_bh(&in_dev->mc_tomb_lock);
607
608 /* change recs */
609 for_each_pmc_rcu(in_dev, pmc) {
610 spin_lock_bh(&pmc->lock);
611 if (pmc->sfcount[MCAST_EXCLUDE]) {
612 type = IGMPV3_BLOCK_OLD_SOURCES;
613 dtype = IGMPV3_ALLOW_NEW_SOURCES;
614 } else {
615 type = IGMPV3_ALLOW_NEW_SOURCES;
616 dtype = IGMPV3_BLOCK_OLD_SOURCES;
617 }
618 skb = add_grec(skb, pmc, type, 0, 0);
619 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
620
621 /* filter mode changes */
622 if (pmc->crcount) {
623 if (pmc->sfmode == MCAST_EXCLUDE)
624 type = IGMPV3_CHANGE_TO_EXCLUDE;
625 else
626 type = IGMPV3_CHANGE_TO_INCLUDE;
627 skb = add_grec(skb, pmc, type, 0, 0);
628 pmc->crcount--;
629 }
630 spin_unlock_bh(&pmc->lock);
631 }
632 rcu_read_unlock();
633
634 if (!skb)
635 return;
636 (void) igmpv3_sendpack(skb);
637 }
638
639 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
640 int type)
641 {
642 struct sk_buff *skb;
643 struct iphdr *iph;
644 struct igmphdr *ih;
645 struct rtable *rt;
646 struct net_device *dev = in_dev->dev;
647 struct net *net = dev_net(dev);
648 __be32 group = pmc ? pmc->multiaddr : 0;
649 struct flowi4 fl4;
650 __be32 dst;
651 int hlen, tlen;
652
653 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
654 return igmpv3_send_report(in_dev, pmc);
655 else if (type == IGMP_HOST_LEAVE_MESSAGE)
656 dst = IGMP_ALL_ROUTER;
657 else
658 dst = group;
659
660 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
661 0, 0,
662 IPPROTO_IGMP, 0, dev->ifindex);
663 if (IS_ERR(rt))
664 return -1;
665
666 hlen = LL_RESERVED_SPACE(dev);
667 tlen = dev->needed_tailroom;
668 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
669 if (skb == NULL) {
670 ip_rt_put(rt);
671 return -1;
672 }
673
674 skb_dst_set(skb, &rt->dst);
675
676 skb_reserve(skb, hlen);
677
678 skb_reset_network_header(skb);
679 iph = ip_hdr(skb);
680 skb_put(skb, sizeof(struct iphdr) + 4);
681
682 iph->version = 4;
683 iph->ihl = (sizeof(struct iphdr)+4)>>2;
684 iph->tos = 0xc0;
685 iph->frag_off = htons(IP_DF);
686 iph->ttl = 1;
687 iph->daddr = dst;
688 iph->saddr = fl4.saddr;
689 iph->protocol = IPPROTO_IGMP;
690 ip_select_ident(iph, &rt->dst, NULL);
691 ((u8 *)&iph[1])[0] = IPOPT_RA;
692 ((u8 *)&iph[1])[1] = 4;
693 ((u8 *)&iph[1])[2] = 0;
694 ((u8 *)&iph[1])[3] = 0;
695
696 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
697 ih->type = type;
698 ih->code = 0;
699 ih->csum = 0;
700 ih->group = group;
701 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
702
703 return ip_local_out(skb);
704 }
705
706 static void igmp_gq_timer_expire(unsigned long data)
707 {
708 struct in_device *in_dev = (struct in_device *)data;
709
710 in_dev->mr_gq_running = 0;
711 igmpv3_send_report(in_dev, NULL);
712 __in_dev_put(in_dev);
713 }
714
715 static void igmp_ifc_timer_expire(unsigned long data)
716 {
717 struct in_device *in_dev = (struct in_device *)data;
718
719 igmpv3_send_cr(in_dev);
720 if (in_dev->mr_ifc_count) {
721 in_dev->mr_ifc_count--;
722 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
723 }
724 __in_dev_put(in_dev);
725 }
726
727 static void igmp_ifc_event(struct in_device *in_dev)
728 {
729 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
730 return;
731 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
732 IGMP_Unsolicited_Report_Count;
733 igmp_ifc_start_timer(in_dev, 1);
734 }
735
736
737 static void igmp_timer_expire(unsigned long data)
738 {
739 struct ip_mc_list *im=(struct ip_mc_list *)data;
740 struct in_device *in_dev = im->interface;
741
742 spin_lock(&im->lock);
743 im->tm_running = 0;
744
745 if (im->unsolicit_count) {
746 im->unsolicit_count--;
747 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
748 }
749 im->reporter = 1;
750 spin_unlock(&im->lock);
751
752 if (IGMP_V1_SEEN(in_dev))
753 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
754 else if (IGMP_V2_SEEN(in_dev))
755 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
756 else
757 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
758
759 ip_ma_put(im);
760 }
761
762 /* mark EXCLUDE-mode sources */
763 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
764 {
765 struct ip_sf_list *psf;
766 int i, scount;
767
768 scount = 0;
769 for (psf=pmc->sources; psf; psf=psf->sf_next) {
770 if (scount == nsrcs)
771 break;
772 for (i=0; i<nsrcs; i++) {
773 /* skip inactive filters */
774 if (psf->sf_count[MCAST_INCLUDE] ||
775 pmc->sfcount[MCAST_EXCLUDE] !=
776 psf->sf_count[MCAST_EXCLUDE])
777 break;
778 if (srcs[i] == psf->sf_inaddr) {
779 scount++;
780 break;
781 }
782 }
783 }
784 pmc->gsquery = 0;
785 if (scount == nsrcs) /* all sources excluded */
786 return 0;
787 return 1;
788 }
789
790 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
791 {
792 struct ip_sf_list *psf;
793 int i, scount;
794
795 if (pmc->sfmode == MCAST_EXCLUDE)
796 return igmp_xmarksources(pmc, nsrcs, srcs);
797
798 /* mark INCLUDE-mode sources */
799 scount = 0;
800 for (psf=pmc->sources; psf; psf=psf->sf_next) {
801 if (scount == nsrcs)
802 break;
803 for (i=0; i<nsrcs; i++)
804 if (srcs[i] == psf->sf_inaddr) {
805 psf->sf_gsresp = 1;
806 scount++;
807 break;
808 }
809 }
810 if (!scount) {
811 pmc->gsquery = 0;
812 return 0;
813 }
814 pmc->gsquery = 1;
815 return 1;
816 }
817
818 /* return true if packet was dropped */
819 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
820 {
821 struct ip_mc_list *im;
822
823 /* Timers are only set for non-local groups */
824
825 if (group == IGMP_ALL_HOSTS)
826 return false;
827
828 rcu_read_lock();
829 for_each_pmc_rcu(in_dev, im) {
830 if (im->multiaddr == group) {
831 igmp_stop_timer(im);
832 break;
833 }
834 }
835 rcu_read_unlock();
836 return false;
837 }
838
839 /* return true if packet was dropped */
840 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
841 int len)
842 {
843 struct igmphdr *ih = igmp_hdr(skb);
844 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
845 struct ip_mc_list *im;
846 __be32 group = ih->group;
847 int max_delay;
848 int mark = 0;
849
850
851 if (len == 8) {
852 if (ih->code == 0) {
853 /* Alas, old v1 router presents here. */
854
855 max_delay = IGMP_Query_Response_Interval;
856 in_dev->mr_v1_seen = jiffies +
857 IGMP_V1_Router_Present_Timeout;
858 group = 0;
859 } else {
860 /* v2 router present */
861 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
862 in_dev->mr_v2_seen = jiffies +
863 IGMP_V2_Router_Present_Timeout;
864 }
865 /* cancel the interface change timer */
866 in_dev->mr_ifc_count = 0;
867 if (del_timer(&in_dev->mr_ifc_timer))
868 __in_dev_put(in_dev);
869 /* clear deleted report items */
870 igmpv3_clear_delrec(in_dev);
871 } else if (len < 12) {
872 return true; /* ignore bogus packet; freed by caller */
873 } else if (IGMP_V1_SEEN(in_dev)) {
874 /* This is a v3 query with v1 queriers present */
875 max_delay = IGMP_Query_Response_Interval;
876 group = 0;
877 } else if (IGMP_V2_SEEN(in_dev)) {
878 /* this is a v3 query with v2 queriers present;
879 * Interpretation of the max_delay code is problematic here.
880 * A real v2 host would use ih_code directly, while v3 has a
881 * different encoding. We use the v3 encoding as more likely
882 * to be intended in a v3 query.
883 */
884 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
885 if (!max_delay)
886 max_delay = 1; /* can't mod w/ 0 */
887 } else { /* v3 */
888 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
889 return true;
890
891 ih3 = igmpv3_query_hdr(skb);
892 if (ih3->nsrcs) {
893 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
894 + ntohs(ih3->nsrcs)*sizeof(__be32)))
895 return true;
896 ih3 = igmpv3_query_hdr(skb);
897 }
898
899 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
900 if (!max_delay)
901 max_delay = 1; /* can't mod w/ 0 */
902 in_dev->mr_maxdelay = max_delay;
903 if (ih3->qrv)
904 in_dev->mr_qrv = ih3->qrv;
905 if (!group) { /* general query */
906 if (ih3->nsrcs)
907 return false; /* no sources allowed */
908 igmp_gq_start_timer(in_dev);
909 return false;
910 }
911 /* mark sources to include, if group & source-specific */
912 mark = ih3->nsrcs != 0;
913 }
914
915 /*
916 * - Start the timers in all of our membership records
917 * that the query applies to for the interface on
918 * which the query arrived excl. those that belong
919 * to a "local" group (224.0.0.X)
920 * - For timers already running check if they need to
921 * be reset.
922 * - Use the igmp->igmp_code field as the maximum
923 * delay possible
924 */
925 rcu_read_lock();
926 for_each_pmc_rcu(in_dev, im) {
927 int changed;
928
929 if (group && group != im->multiaddr)
930 continue;
931 if (im->multiaddr == IGMP_ALL_HOSTS)
932 continue;
933 spin_lock_bh(&im->lock);
934 if (im->tm_running)
935 im->gsquery = im->gsquery && mark;
936 else
937 im->gsquery = mark;
938 changed = !im->gsquery ||
939 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
940 spin_unlock_bh(&im->lock);
941 if (changed)
942 igmp_mod_timer(im, max_delay);
943 }
944 rcu_read_unlock();
945 return false;
946 }
947
948 /* called in rcu_read_lock() section */
949 int igmp_rcv(struct sk_buff *skb)
950 {
951 /* This basically follows the spec line by line -- see RFC1112 */
952 struct igmphdr *ih;
953 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
954 int len = skb->len;
955 bool dropped = true;
956
957 if (in_dev == NULL)
958 goto drop;
959
960 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
961 goto drop;
962
963 switch (skb->ip_summed) {
964 case CHECKSUM_COMPLETE:
965 if (!csum_fold(skb->csum))
966 break;
967 /* fall through */
968 case CHECKSUM_NONE:
969 skb->csum = 0;
970 if (__skb_checksum_complete(skb))
971 goto drop;
972 }
973
974 ih = igmp_hdr(skb);
975 switch (ih->type) {
976 case IGMP_HOST_MEMBERSHIP_QUERY:
977 dropped = igmp_heard_query(in_dev, skb, len);
978 break;
979 case IGMP_HOST_MEMBERSHIP_REPORT:
980 case IGMPV2_HOST_MEMBERSHIP_REPORT:
981 /* Is it our report looped back? */
982 if (rt_is_output_route(skb_rtable(skb)))
983 break;
984 /* don't rely on MC router hearing unicast reports */
985 if (skb->pkt_type == PACKET_MULTICAST ||
986 skb->pkt_type == PACKET_BROADCAST)
987 dropped = igmp_heard_report(in_dev, ih->group);
988 break;
989 case IGMP_PIM:
990 #ifdef CONFIG_IP_PIMSM_V1
991 return pim_rcv_v1(skb);
992 #endif
993 case IGMPV3_HOST_MEMBERSHIP_REPORT:
994 case IGMP_DVMRP:
995 case IGMP_TRACE:
996 case IGMP_HOST_LEAVE_MESSAGE:
997 case IGMP_MTRACE:
998 case IGMP_MTRACE_RESP:
999 break;
1000 default:
1001 break;
1002 }
1003
1004 drop:
1005 if (dropped)
1006 kfree_skb(skb);
1007 else
1008 consume_skb(skb);
1009 return 0;
1010 }
1011
1012 #endif
1013
1014
1015 /*
1016 * Add a filter to a device
1017 */
1018
1019 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1020 {
1021 char buf[MAX_ADDR_LEN];
1022 struct net_device *dev = in_dev->dev;
1023
1024 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1025 We will get multicast token leakage, when IFF_MULTICAST
1026 is changed. This check should be done in ndo_set_rx_mode
1027 routine. Something sort of:
1028 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1029 --ANK
1030 */
1031 if (arp_mc_map(addr, buf, dev, 0) == 0)
1032 dev_mc_add(dev, buf);
1033 }
1034
1035 /*
1036 * Remove a filter from a device
1037 */
1038
1039 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1040 {
1041 char buf[MAX_ADDR_LEN];
1042 struct net_device *dev = in_dev->dev;
1043
1044 if (arp_mc_map(addr, buf, dev, 0) == 0)
1045 dev_mc_del(dev, buf);
1046 }
1047
1048 #ifdef CONFIG_IP_MULTICAST
1049 /*
1050 * deleted ip_mc_list manipulation
1051 */
1052 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1053 {
1054 struct ip_mc_list *pmc;
1055
1056 /* this is an "ip_mc_list" for convenience; only the fields below
1057 * are actually used. In particular, the refcnt and users are not
1058 * used for management of the delete list. Using the same structure
1059 * for deleted items allows change reports to use common code with
1060 * non-deleted or query-response MCA's.
1061 */
1062 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1063 if (!pmc)
1064 return;
1065 spin_lock_bh(&im->lock);
1066 pmc->interface = im->interface;
1067 in_dev_hold(in_dev);
1068 pmc->multiaddr = im->multiaddr;
1069 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1070 IGMP_Unsolicited_Report_Count;
1071 pmc->sfmode = im->sfmode;
1072 if (pmc->sfmode == MCAST_INCLUDE) {
1073 struct ip_sf_list *psf;
1074
1075 pmc->tomb = im->tomb;
1076 pmc->sources = im->sources;
1077 im->tomb = im->sources = NULL;
1078 for (psf=pmc->sources; psf; psf=psf->sf_next)
1079 psf->sf_crcount = pmc->crcount;
1080 }
1081 spin_unlock_bh(&im->lock);
1082
1083 spin_lock_bh(&in_dev->mc_tomb_lock);
1084 pmc->next = in_dev->mc_tomb;
1085 in_dev->mc_tomb = pmc;
1086 spin_unlock_bh(&in_dev->mc_tomb_lock);
1087 }
1088
1089 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1090 {
1091 struct ip_mc_list *pmc, *pmc_prev;
1092 struct ip_sf_list *psf, *psf_next;
1093
1094 spin_lock_bh(&in_dev->mc_tomb_lock);
1095 pmc_prev = NULL;
1096 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1097 if (pmc->multiaddr == multiaddr)
1098 break;
1099 pmc_prev = pmc;
1100 }
1101 if (pmc) {
1102 if (pmc_prev)
1103 pmc_prev->next = pmc->next;
1104 else
1105 in_dev->mc_tomb = pmc->next;
1106 }
1107 spin_unlock_bh(&in_dev->mc_tomb_lock);
1108 if (pmc) {
1109 for (psf=pmc->tomb; psf; psf=psf_next) {
1110 psf_next = psf->sf_next;
1111 kfree(psf);
1112 }
1113 in_dev_put(pmc->interface);
1114 kfree(pmc);
1115 }
1116 }
1117
1118 static void igmpv3_clear_delrec(struct in_device *in_dev)
1119 {
1120 struct ip_mc_list *pmc, *nextpmc;
1121
1122 spin_lock_bh(&in_dev->mc_tomb_lock);
1123 pmc = in_dev->mc_tomb;
1124 in_dev->mc_tomb = NULL;
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1126
1127 for (; pmc; pmc = nextpmc) {
1128 nextpmc = pmc->next;
1129 ip_mc_clear_src(pmc);
1130 in_dev_put(pmc->interface);
1131 kfree(pmc);
1132 }
1133 /* clear dead sources, too */
1134 rcu_read_lock();
1135 for_each_pmc_rcu(in_dev, pmc) {
1136 struct ip_sf_list *psf, *psf_next;
1137
1138 spin_lock_bh(&pmc->lock);
1139 psf = pmc->tomb;
1140 pmc->tomb = NULL;
1141 spin_unlock_bh(&pmc->lock);
1142 for (; psf; psf=psf_next) {
1143 psf_next = psf->sf_next;
1144 kfree(psf);
1145 }
1146 }
1147 rcu_read_unlock();
1148 }
1149 #endif
1150
1151 static void igmp_group_dropped(struct ip_mc_list *im)
1152 {
1153 struct in_device *in_dev = im->interface;
1154 #ifdef CONFIG_IP_MULTICAST
1155 int reporter;
1156 #endif
1157
1158 if (im->loaded) {
1159 im->loaded = 0;
1160 ip_mc_filter_del(in_dev, im->multiaddr);
1161 }
1162
1163 #ifdef CONFIG_IP_MULTICAST
1164 if (im->multiaddr == IGMP_ALL_HOSTS)
1165 return;
1166
1167 reporter = im->reporter;
1168 igmp_stop_timer(im);
1169
1170 if (!in_dev->dead) {
1171 if (IGMP_V1_SEEN(in_dev))
1172 return;
1173 if (IGMP_V2_SEEN(in_dev)) {
1174 if (reporter)
1175 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1176 return;
1177 }
1178 /* IGMPv3 */
1179 igmpv3_add_delrec(in_dev, im);
1180
1181 igmp_ifc_event(in_dev);
1182 }
1183 #endif
1184 }
1185
1186 static void igmp_group_added(struct ip_mc_list *im)
1187 {
1188 struct in_device *in_dev = im->interface;
1189
1190 if (im->loaded == 0) {
1191 im->loaded = 1;
1192 ip_mc_filter_add(in_dev, im->multiaddr);
1193 }
1194
1195 #ifdef CONFIG_IP_MULTICAST
1196 if (im->multiaddr == IGMP_ALL_HOSTS)
1197 return;
1198
1199 if (in_dev->dead)
1200 return;
1201 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1202 spin_lock_bh(&im->lock);
1203 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1204 spin_unlock_bh(&im->lock);
1205 return;
1206 }
1207 /* else, v3 */
1208
1209 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1210 IGMP_Unsolicited_Report_Count;
1211 igmp_ifc_event(in_dev);
1212 #endif
1213 }
1214
1215
1216 /*
1217 * Multicast list managers
1218 */
1219
1220 static u32 ip_mc_hash(const struct ip_mc_list *im)
1221 {
1222 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1223 }
1224
1225 static void ip_mc_hash_add(struct in_device *in_dev,
1226 struct ip_mc_list *im)
1227 {
1228 struct ip_mc_list __rcu **mc_hash;
1229 u32 hash;
1230
1231 mc_hash = rtnl_dereference(in_dev->mc_hash);
1232 if (mc_hash) {
1233 hash = ip_mc_hash(im);
1234 im->next_hash = mc_hash[hash];
1235 rcu_assign_pointer(mc_hash[hash], im);
1236 return;
1237 }
1238
1239 /* do not use a hash table for small number of items */
1240 if (in_dev->mc_count < 4)
1241 return;
1242
1243 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1244 GFP_KERNEL);
1245 if (!mc_hash)
1246 return;
1247
1248 for_each_pmc_rtnl(in_dev, im) {
1249 hash = ip_mc_hash(im);
1250 im->next_hash = mc_hash[hash];
1251 RCU_INIT_POINTER(mc_hash[hash], im);
1252 }
1253
1254 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1255 }
1256
1257 static void ip_mc_hash_remove(struct in_device *in_dev,
1258 struct ip_mc_list *im)
1259 {
1260 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1261 struct ip_mc_list *aux;
1262
1263 if (!mc_hash)
1264 return;
1265 mc_hash += ip_mc_hash(im);
1266 while ((aux = rtnl_dereference(*mc_hash)) != im)
1267 mc_hash = &aux->next_hash;
1268 *mc_hash = im->next_hash;
1269 }
1270
1271
1272 /*
1273 * A socket has joined a multicast group on device dev.
1274 */
1275
1276 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1277 {
1278 struct ip_mc_list *im;
1279
1280 ASSERT_RTNL();
1281
1282 for_each_pmc_rtnl(in_dev, im) {
1283 if (im->multiaddr == addr) {
1284 im->users++;
1285 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1286 goto out;
1287 }
1288 }
1289
1290 im = kzalloc(sizeof(*im), GFP_KERNEL);
1291 if (!im)
1292 goto out;
1293
1294 im->users = 1;
1295 im->interface = in_dev;
1296 in_dev_hold(in_dev);
1297 im->multiaddr = addr;
1298 /* initial mode is (EX, empty) */
1299 im->sfmode = MCAST_EXCLUDE;
1300 im->sfcount[MCAST_EXCLUDE] = 1;
1301 atomic_set(&im->refcnt, 1);
1302 spin_lock_init(&im->lock);
1303 #ifdef CONFIG_IP_MULTICAST
1304 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1305 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1306 #endif
1307
1308 im->next_rcu = in_dev->mc_list;
1309 in_dev->mc_count++;
1310 rcu_assign_pointer(in_dev->mc_list, im);
1311
1312 ip_mc_hash_add(in_dev, im);
1313
1314 #ifdef CONFIG_IP_MULTICAST
1315 igmpv3_del_delrec(in_dev, im->multiaddr);
1316 #endif
1317 igmp_group_added(im);
1318 if (!in_dev->dead)
1319 ip_rt_multicast_event(in_dev);
1320 out:
1321 return;
1322 }
1323 EXPORT_SYMBOL(ip_mc_inc_group);
1324
1325 /*
1326 * Resend IGMP JOIN report; used for bonding.
1327 * Called with rcu_read_lock()
1328 */
1329 void ip_mc_rejoin_groups(struct in_device *in_dev)
1330 {
1331 #ifdef CONFIG_IP_MULTICAST
1332 struct ip_mc_list *im;
1333 int type;
1334
1335 for_each_pmc_rcu(in_dev, im) {
1336 if (im->multiaddr == IGMP_ALL_HOSTS)
1337 continue;
1338
1339 /* a failover is happening and switches
1340 * must be notified immediately
1341 */
1342 if (IGMP_V1_SEEN(in_dev))
1343 type = IGMP_HOST_MEMBERSHIP_REPORT;
1344 else if (IGMP_V2_SEEN(in_dev))
1345 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1346 else
1347 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1348 igmp_send_report(in_dev, im, type);
1349 }
1350 #endif
1351 }
1352 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1353
1354 /*
1355 * A socket has left a multicast group on device dev
1356 */
1357
1358 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1359 {
1360 struct ip_mc_list *i;
1361 struct ip_mc_list __rcu **ip;
1362
1363 ASSERT_RTNL();
1364
1365 for (ip = &in_dev->mc_list;
1366 (i = rtnl_dereference(*ip)) != NULL;
1367 ip = &i->next_rcu) {
1368 if (i->multiaddr == addr) {
1369 if (--i->users == 0) {
1370 ip_mc_hash_remove(in_dev, i);
1371 *ip = i->next_rcu;
1372 in_dev->mc_count--;
1373 igmp_group_dropped(i);
1374 ip_mc_clear_src(i);
1375
1376 if (!in_dev->dead)
1377 ip_rt_multicast_event(in_dev);
1378
1379 ip_ma_put(i);
1380 return;
1381 }
1382 break;
1383 }
1384 }
1385 }
1386 EXPORT_SYMBOL(ip_mc_dec_group);
1387
1388 /* Device changing type */
1389
1390 void ip_mc_unmap(struct in_device *in_dev)
1391 {
1392 struct ip_mc_list *pmc;
1393
1394 ASSERT_RTNL();
1395
1396 for_each_pmc_rtnl(in_dev, pmc)
1397 igmp_group_dropped(pmc);
1398 }
1399
1400 void ip_mc_remap(struct in_device *in_dev)
1401 {
1402 struct ip_mc_list *pmc;
1403
1404 ASSERT_RTNL();
1405
1406 for_each_pmc_rtnl(in_dev, pmc)
1407 igmp_group_added(pmc);
1408 }
1409
1410 /* Device going down */
1411
1412 void ip_mc_down(struct in_device *in_dev)
1413 {
1414 struct ip_mc_list *pmc;
1415
1416 ASSERT_RTNL();
1417
1418 for_each_pmc_rtnl(in_dev, pmc)
1419 igmp_group_dropped(pmc);
1420
1421 #ifdef CONFIG_IP_MULTICAST
1422 in_dev->mr_ifc_count = 0;
1423 if (del_timer(&in_dev->mr_ifc_timer))
1424 __in_dev_put(in_dev);
1425 in_dev->mr_gq_running = 0;
1426 if (del_timer(&in_dev->mr_gq_timer))
1427 __in_dev_put(in_dev);
1428 igmpv3_clear_delrec(in_dev);
1429 #endif
1430
1431 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1432 }
1433
1434 void ip_mc_init_dev(struct in_device *in_dev)
1435 {
1436 ASSERT_RTNL();
1437
1438 #ifdef CONFIG_IP_MULTICAST
1439 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1440 (unsigned long)in_dev);
1441 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1442 (unsigned long)in_dev);
1443 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1444 #endif
1445
1446 spin_lock_init(&in_dev->mc_tomb_lock);
1447 }
1448
1449 /* Device going up */
1450
1451 void ip_mc_up(struct in_device *in_dev)
1452 {
1453 struct ip_mc_list *pmc;
1454
1455 ASSERT_RTNL();
1456
1457 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1458
1459 for_each_pmc_rtnl(in_dev, pmc)
1460 igmp_group_added(pmc);
1461 }
1462
1463 /*
1464 * Device is about to be destroyed: clean up.
1465 */
1466
1467 void ip_mc_destroy_dev(struct in_device *in_dev)
1468 {
1469 struct ip_mc_list *i;
1470
1471 ASSERT_RTNL();
1472
1473 /* Deactivate timers */
1474 ip_mc_down(in_dev);
1475
1476 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1477 in_dev->mc_list = i->next_rcu;
1478 in_dev->mc_count--;
1479
1480 /* We've dropped the groups in ip_mc_down already */
1481 ip_mc_clear_src(i);
1482 ip_ma_put(i);
1483 }
1484 }
1485
1486 /* RTNL is locked */
1487 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1488 {
1489 struct net_device *dev = NULL;
1490 struct in_device *idev = NULL;
1491
1492 if (imr->imr_ifindex) {
1493 idev = inetdev_by_index(net, imr->imr_ifindex);
1494 return idev;
1495 }
1496 if (imr->imr_address.s_addr) {
1497 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1498 if (!dev)
1499 return NULL;
1500 }
1501
1502 if (!dev) {
1503 struct rtable *rt = ip_route_output(net,
1504 imr->imr_multiaddr.s_addr,
1505 0, 0, 0);
1506 if (!IS_ERR(rt)) {
1507 dev = rt->dst.dev;
1508 ip_rt_put(rt);
1509 }
1510 }
1511 if (dev) {
1512 imr->imr_ifindex = dev->ifindex;
1513 idev = __in_dev_get_rtnl(dev);
1514 }
1515 return idev;
1516 }
1517
1518 /*
1519 * Join a socket to a group
1520 */
1521 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1522 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1523
1524
1525 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1526 __be32 *psfsrc)
1527 {
1528 struct ip_sf_list *psf, *psf_prev;
1529 int rv = 0;
1530
1531 psf_prev = NULL;
1532 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1533 if (psf->sf_inaddr == *psfsrc)
1534 break;
1535 psf_prev = psf;
1536 }
1537 if (!psf || psf->sf_count[sfmode] == 0) {
1538 /* source filter not found, or count wrong => bug */
1539 return -ESRCH;
1540 }
1541 psf->sf_count[sfmode]--;
1542 if (psf->sf_count[sfmode] == 0) {
1543 ip_rt_multicast_event(pmc->interface);
1544 }
1545 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1546 #ifdef CONFIG_IP_MULTICAST
1547 struct in_device *in_dev = pmc->interface;
1548 #endif
1549
1550 /* no more filters for this source */
1551 if (psf_prev)
1552 psf_prev->sf_next = psf->sf_next;
1553 else
1554 pmc->sources = psf->sf_next;
1555 #ifdef CONFIG_IP_MULTICAST
1556 if (psf->sf_oldin &&
1557 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1558 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1559 IGMP_Unsolicited_Report_Count;
1560 psf->sf_next = pmc->tomb;
1561 pmc->tomb = psf;
1562 rv = 1;
1563 } else
1564 #endif
1565 kfree(psf);
1566 }
1567 return rv;
1568 }
1569
1570 #ifndef CONFIG_IP_MULTICAST
1571 #define igmp_ifc_event(x) do { } while (0)
1572 #endif
1573
1574 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1575 int sfcount, __be32 *psfsrc, int delta)
1576 {
1577 struct ip_mc_list *pmc;
1578 int changerec = 0;
1579 int i, err;
1580
1581 if (!in_dev)
1582 return -ENODEV;
1583 rcu_read_lock();
1584 for_each_pmc_rcu(in_dev, pmc) {
1585 if (*pmca == pmc->multiaddr)
1586 break;
1587 }
1588 if (!pmc) {
1589 /* MCA not found?? bug */
1590 rcu_read_unlock();
1591 return -ESRCH;
1592 }
1593 spin_lock_bh(&pmc->lock);
1594 rcu_read_unlock();
1595 #ifdef CONFIG_IP_MULTICAST
1596 sf_markstate(pmc);
1597 #endif
1598 if (!delta) {
1599 err = -EINVAL;
1600 if (!pmc->sfcount[sfmode])
1601 goto out_unlock;
1602 pmc->sfcount[sfmode]--;
1603 }
1604 err = 0;
1605 for (i=0; i<sfcount; i++) {
1606 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1607
1608 changerec |= rv > 0;
1609 if (!err && rv < 0)
1610 err = rv;
1611 }
1612 if (pmc->sfmode == MCAST_EXCLUDE &&
1613 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1614 pmc->sfcount[MCAST_INCLUDE]) {
1615 #ifdef CONFIG_IP_MULTICAST
1616 struct ip_sf_list *psf;
1617 #endif
1618
1619 /* filter mode change */
1620 pmc->sfmode = MCAST_INCLUDE;
1621 #ifdef CONFIG_IP_MULTICAST
1622 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1623 IGMP_Unsolicited_Report_Count;
1624 in_dev->mr_ifc_count = pmc->crcount;
1625 for (psf=pmc->sources; psf; psf = psf->sf_next)
1626 psf->sf_crcount = 0;
1627 igmp_ifc_event(pmc->interface);
1628 } else if (sf_setstate(pmc) || changerec) {
1629 igmp_ifc_event(pmc->interface);
1630 #endif
1631 }
1632 out_unlock:
1633 spin_unlock_bh(&pmc->lock);
1634 return err;
1635 }
1636
1637 /*
1638 * Add multicast single-source filter to the interface list
1639 */
1640 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1641 __be32 *psfsrc)
1642 {
1643 struct ip_sf_list *psf, *psf_prev;
1644
1645 psf_prev = NULL;
1646 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1647 if (psf->sf_inaddr == *psfsrc)
1648 break;
1649 psf_prev = psf;
1650 }
1651 if (!psf) {
1652 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1653 if (!psf)
1654 return -ENOBUFS;
1655 psf->sf_inaddr = *psfsrc;
1656 if (psf_prev) {
1657 psf_prev->sf_next = psf;
1658 } else
1659 pmc->sources = psf;
1660 }
1661 psf->sf_count[sfmode]++;
1662 if (psf->sf_count[sfmode] == 1) {
1663 ip_rt_multicast_event(pmc->interface);
1664 }
1665 return 0;
1666 }
1667
1668 #ifdef CONFIG_IP_MULTICAST
1669 static void sf_markstate(struct ip_mc_list *pmc)
1670 {
1671 struct ip_sf_list *psf;
1672 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1673
1674 for (psf=pmc->sources; psf; psf=psf->sf_next)
1675 if (pmc->sfcount[MCAST_EXCLUDE]) {
1676 psf->sf_oldin = mca_xcount ==
1677 psf->sf_count[MCAST_EXCLUDE] &&
1678 !psf->sf_count[MCAST_INCLUDE];
1679 } else
1680 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1681 }
1682
1683 static int sf_setstate(struct ip_mc_list *pmc)
1684 {
1685 struct ip_sf_list *psf, *dpsf;
1686 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1687 int qrv = pmc->interface->mr_qrv;
1688 int new_in, rv;
1689
1690 rv = 0;
1691 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1692 if (pmc->sfcount[MCAST_EXCLUDE]) {
1693 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1694 !psf->sf_count[MCAST_INCLUDE];
1695 } else
1696 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1697 if (new_in) {
1698 if (!psf->sf_oldin) {
1699 struct ip_sf_list *prev = NULL;
1700
1701 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1702 if (dpsf->sf_inaddr == psf->sf_inaddr)
1703 break;
1704 prev = dpsf;
1705 }
1706 if (dpsf) {
1707 if (prev)
1708 prev->sf_next = dpsf->sf_next;
1709 else
1710 pmc->tomb = dpsf->sf_next;
1711 kfree(dpsf);
1712 }
1713 psf->sf_crcount = qrv;
1714 rv++;
1715 }
1716 } else if (psf->sf_oldin) {
1717
1718 psf->sf_crcount = 0;
1719 /*
1720 * add or update "delete" records if an active filter
1721 * is now inactive
1722 */
1723 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1724 if (dpsf->sf_inaddr == psf->sf_inaddr)
1725 break;
1726 if (!dpsf) {
1727 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1728 if (!dpsf)
1729 continue;
1730 *dpsf = *psf;
1731 /* pmc->lock held by callers */
1732 dpsf->sf_next = pmc->tomb;
1733 pmc->tomb = dpsf;
1734 }
1735 dpsf->sf_crcount = qrv;
1736 rv++;
1737 }
1738 }
1739 return rv;
1740 }
1741 #endif
1742
1743 /*
1744 * Add multicast source filter list to the interface list
1745 */
1746 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1747 int sfcount, __be32 *psfsrc, int delta)
1748 {
1749 struct ip_mc_list *pmc;
1750 int isexclude;
1751 int i, err;
1752
1753 if (!in_dev)
1754 return -ENODEV;
1755 rcu_read_lock();
1756 for_each_pmc_rcu(in_dev, pmc) {
1757 if (*pmca == pmc->multiaddr)
1758 break;
1759 }
1760 if (!pmc) {
1761 /* MCA not found?? bug */
1762 rcu_read_unlock();
1763 return -ESRCH;
1764 }
1765 spin_lock_bh(&pmc->lock);
1766 rcu_read_unlock();
1767
1768 #ifdef CONFIG_IP_MULTICAST
1769 sf_markstate(pmc);
1770 #endif
1771 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1772 if (!delta)
1773 pmc->sfcount[sfmode]++;
1774 err = 0;
1775 for (i=0; i<sfcount; i++) {
1776 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1777 if (err)
1778 break;
1779 }
1780 if (err) {
1781 int j;
1782
1783 if (!delta)
1784 pmc->sfcount[sfmode]--;
1785 for (j=0; j<i; j++)
1786 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1787 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1788 #ifdef CONFIG_IP_MULTICAST
1789 struct ip_sf_list *psf;
1790 in_dev = pmc->interface;
1791 #endif
1792
1793 /* filter mode change */
1794 if (pmc->sfcount[MCAST_EXCLUDE])
1795 pmc->sfmode = MCAST_EXCLUDE;
1796 else if (pmc->sfcount[MCAST_INCLUDE])
1797 pmc->sfmode = MCAST_INCLUDE;
1798 #ifdef CONFIG_IP_MULTICAST
1799 /* else no filters; keep old mode for reports */
1800
1801 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1802 IGMP_Unsolicited_Report_Count;
1803 in_dev->mr_ifc_count = pmc->crcount;
1804 for (psf=pmc->sources; psf; psf = psf->sf_next)
1805 psf->sf_crcount = 0;
1806 igmp_ifc_event(in_dev);
1807 } else if (sf_setstate(pmc)) {
1808 igmp_ifc_event(in_dev);
1809 #endif
1810 }
1811 spin_unlock_bh(&pmc->lock);
1812 return err;
1813 }
1814
1815 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1816 {
1817 struct ip_sf_list *psf, *nextpsf;
1818
1819 for (psf=pmc->tomb; psf; psf=nextpsf) {
1820 nextpsf = psf->sf_next;
1821 kfree(psf);
1822 }
1823 pmc->tomb = NULL;
1824 for (psf=pmc->sources; psf; psf=nextpsf) {
1825 nextpsf = psf->sf_next;
1826 kfree(psf);
1827 }
1828 pmc->sources = NULL;
1829 pmc->sfmode = MCAST_EXCLUDE;
1830 pmc->sfcount[MCAST_INCLUDE] = 0;
1831 pmc->sfcount[MCAST_EXCLUDE] = 1;
1832 }
1833
1834
1835 /*
1836 * Join a multicast group
1837 */
1838 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1839 {
1840 int err;
1841 __be32 addr = imr->imr_multiaddr.s_addr;
1842 struct ip_mc_socklist *iml = NULL, *i;
1843 struct in_device *in_dev;
1844 struct inet_sock *inet = inet_sk(sk);
1845 struct net *net = sock_net(sk);
1846 int ifindex;
1847 int count = 0;
1848
1849 if (!ipv4_is_multicast(addr))
1850 return -EINVAL;
1851
1852 rtnl_lock();
1853
1854 in_dev = ip_mc_find_dev(net, imr);
1855
1856 if (!in_dev) {
1857 iml = NULL;
1858 err = -ENODEV;
1859 goto done;
1860 }
1861
1862 err = -EADDRINUSE;
1863 ifindex = imr->imr_ifindex;
1864 for_each_pmc_rtnl(inet, i) {
1865 if (i->multi.imr_multiaddr.s_addr == addr &&
1866 i->multi.imr_ifindex == ifindex)
1867 goto done;
1868 count++;
1869 }
1870 err = -ENOBUFS;
1871 if (count >= sysctl_igmp_max_memberships)
1872 goto done;
1873 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1874 if (iml == NULL)
1875 goto done;
1876
1877 memcpy(&iml->multi, imr, sizeof(*imr));
1878 iml->next_rcu = inet->mc_list;
1879 iml->sflist = NULL;
1880 iml->sfmode = MCAST_EXCLUDE;
1881 rcu_assign_pointer(inet->mc_list, iml);
1882 ip_mc_inc_group(in_dev, addr);
1883 err = 0;
1884 done:
1885 rtnl_unlock();
1886 return err;
1887 }
1888 EXPORT_SYMBOL(ip_mc_join_group);
1889
1890 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1891 struct in_device *in_dev)
1892 {
1893 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1894 int err;
1895
1896 if (psf == NULL) {
1897 /* any-source empty exclude case */
1898 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1899 iml->sfmode, 0, NULL, 0);
1900 }
1901 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1902 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1903 RCU_INIT_POINTER(iml->sflist, NULL);
1904 /* decrease mem now to avoid the memleak warning */
1905 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1906 kfree_rcu(psf, rcu);
1907 return err;
1908 }
1909
1910 /*
1911 * Ask a socket to leave a group.
1912 */
1913
1914 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1915 {
1916 struct inet_sock *inet = inet_sk(sk);
1917 struct ip_mc_socklist *iml;
1918 struct ip_mc_socklist __rcu **imlp;
1919 struct in_device *in_dev;
1920 struct net *net = sock_net(sk);
1921 __be32 group = imr->imr_multiaddr.s_addr;
1922 u32 ifindex;
1923 int ret = -EADDRNOTAVAIL;
1924
1925 rtnl_lock();
1926 in_dev = ip_mc_find_dev(net, imr);
1927 ifindex = imr->imr_ifindex;
1928 for (imlp = &inet->mc_list;
1929 (iml = rtnl_dereference(*imlp)) != NULL;
1930 imlp = &iml->next_rcu) {
1931 if (iml->multi.imr_multiaddr.s_addr != group)
1932 continue;
1933 if (ifindex) {
1934 if (iml->multi.imr_ifindex != ifindex)
1935 continue;
1936 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1937 iml->multi.imr_address.s_addr)
1938 continue;
1939
1940 (void) ip_mc_leave_src(sk, iml, in_dev);
1941
1942 *imlp = iml->next_rcu;
1943
1944 if (in_dev)
1945 ip_mc_dec_group(in_dev, group);
1946 rtnl_unlock();
1947 /* decrease mem now to avoid the memleak warning */
1948 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1949 kfree_rcu(iml, rcu);
1950 return 0;
1951 }
1952 if (!in_dev)
1953 ret = -ENODEV;
1954 rtnl_unlock();
1955 return ret;
1956 }
1957 EXPORT_SYMBOL(ip_mc_leave_group);
1958
1959 int ip_mc_source(int add, int omode, struct sock *sk, struct
1960 ip_mreq_source *mreqs, int ifindex)
1961 {
1962 int err;
1963 struct ip_mreqn imr;
1964 __be32 addr = mreqs->imr_multiaddr;
1965 struct ip_mc_socklist *pmc;
1966 struct in_device *in_dev = NULL;
1967 struct inet_sock *inet = inet_sk(sk);
1968 struct ip_sf_socklist *psl;
1969 struct net *net = sock_net(sk);
1970 int leavegroup = 0;
1971 int i, j, rv;
1972
1973 if (!ipv4_is_multicast(addr))
1974 return -EINVAL;
1975
1976 rtnl_lock();
1977
1978 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1979 imr.imr_address.s_addr = mreqs->imr_interface;
1980 imr.imr_ifindex = ifindex;
1981 in_dev = ip_mc_find_dev(net, &imr);
1982
1983 if (!in_dev) {
1984 err = -ENODEV;
1985 goto done;
1986 }
1987 err = -EADDRNOTAVAIL;
1988
1989 for_each_pmc_rtnl(inet, pmc) {
1990 if ((pmc->multi.imr_multiaddr.s_addr ==
1991 imr.imr_multiaddr.s_addr) &&
1992 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1993 break;
1994 }
1995 if (!pmc) { /* must have a prior join */
1996 err = -EINVAL;
1997 goto done;
1998 }
1999 /* if a source filter was set, must be the same mode as before */
2000 if (pmc->sflist) {
2001 if (pmc->sfmode != omode) {
2002 err = -EINVAL;
2003 goto done;
2004 }
2005 } else if (pmc->sfmode != omode) {
2006 /* allow mode switches for empty-set filters */
2007 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2008 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2009 NULL, 0);
2010 pmc->sfmode = omode;
2011 }
2012
2013 psl = rtnl_dereference(pmc->sflist);
2014 if (!add) {
2015 if (!psl)
2016 goto done; /* err = -EADDRNOTAVAIL */
2017 rv = !0;
2018 for (i=0; i<psl->sl_count; i++) {
2019 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2020 sizeof(__be32));
2021 if (rv == 0)
2022 break;
2023 }
2024 if (rv) /* source not found */
2025 goto done; /* err = -EADDRNOTAVAIL */
2026
2027 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2028 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2029 leavegroup = 1;
2030 goto done;
2031 }
2032
2033 /* update the interface filter */
2034 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2035 &mreqs->imr_sourceaddr, 1);
2036
2037 for (j=i+1; j<psl->sl_count; j++)
2038 psl->sl_addr[j-1] = psl->sl_addr[j];
2039 psl->sl_count--;
2040 err = 0;
2041 goto done;
2042 }
2043 /* else, add a new source to the filter */
2044
2045 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2046 err = -ENOBUFS;
2047 goto done;
2048 }
2049 if (!psl || psl->sl_count == psl->sl_max) {
2050 struct ip_sf_socklist *newpsl;
2051 int count = IP_SFBLOCK;
2052
2053 if (psl)
2054 count += psl->sl_max;
2055 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2056 if (!newpsl) {
2057 err = -ENOBUFS;
2058 goto done;
2059 }
2060 newpsl->sl_max = count;
2061 newpsl->sl_count = count - IP_SFBLOCK;
2062 if (psl) {
2063 for (i=0; i<psl->sl_count; i++)
2064 newpsl->sl_addr[i] = psl->sl_addr[i];
2065 /* decrease mem now to avoid the memleak warning */
2066 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2067 kfree_rcu(psl, rcu);
2068 }
2069 rcu_assign_pointer(pmc->sflist, newpsl);
2070 psl = newpsl;
2071 }
2072 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2073 for (i=0; i<psl->sl_count; i++) {
2074 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2075 sizeof(__be32));
2076 if (rv == 0)
2077 break;
2078 }
2079 if (rv == 0) /* address already there is an error */
2080 goto done;
2081 for (j=psl->sl_count-1; j>=i; j--)
2082 psl->sl_addr[j+1] = psl->sl_addr[j];
2083 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2084 psl->sl_count++;
2085 err = 0;
2086 /* update the interface list */
2087 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2088 &mreqs->imr_sourceaddr, 1);
2089 done:
2090 rtnl_unlock();
2091 if (leavegroup)
2092 return ip_mc_leave_group(sk, &imr);
2093 return err;
2094 }
2095
2096 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2097 {
2098 int err = 0;
2099 struct ip_mreqn imr;
2100 __be32 addr = msf->imsf_multiaddr;
2101 struct ip_mc_socklist *pmc;
2102 struct in_device *in_dev;
2103 struct inet_sock *inet = inet_sk(sk);
2104 struct ip_sf_socklist *newpsl, *psl;
2105 struct net *net = sock_net(sk);
2106 int leavegroup = 0;
2107
2108 if (!ipv4_is_multicast(addr))
2109 return -EINVAL;
2110 if (msf->imsf_fmode != MCAST_INCLUDE &&
2111 msf->imsf_fmode != MCAST_EXCLUDE)
2112 return -EINVAL;
2113
2114 rtnl_lock();
2115
2116 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2117 imr.imr_address.s_addr = msf->imsf_interface;
2118 imr.imr_ifindex = ifindex;
2119 in_dev = ip_mc_find_dev(net, &imr);
2120
2121 if (!in_dev) {
2122 err = -ENODEV;
2123 goto done;
2124 }
2125
2126 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2127 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2128 leavegroup = 1;
2129 goto done;
2130 }
2131
2132 for_each_pmc_rtnl(inet, pmc) {
2133 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2134 pmc->multi.imr_ifindex == imr.imr_ifindex)
2135 break;
2136 }
2137 if (!pmc) { /* must have a prior join */
2138 err = -EINVAL;
2139 goto done;
2140 }
2141 if (msf->imsf_numsrc) {
2142 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2143 GFP_KERNEL);
2144 if (!newpsl) {
2145 err = -ENOBUFS;
2146 goto done;
2147 }
2148 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2149 memcpy(newpsl->sl_addr, msf->imsf_slist,
2150 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2151 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2152 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2153 if (err) {
2154 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2155 goto done;
2156 }
2157 } else {
2158 newpsl = NULL;
2159 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2160 msf->imsf_fmode, 0, NULL, 0);
2161 }
2162 psl = rtnl_dereference(pmc->sflist);
2163 if (psl) {
2164 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2165 psl->sl_count, psl->sl_addr, 0);
2166 /* decrease mem now to avoid the memleak warning */
2167 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2168 kfree_rcu(psl, rcu);
2169 } else
2170 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2171 0, NULL, 0);
2172 rcu_assign_pointer(pmc->sflist, newpsl);
2173 pmc->sfmode = msf->imsf_fmode;
2174 err = 0;
2175 done:
2176 rtnl_unlock();
2177 if (leavegroup)
2178 err = ip_mc_leave_group(sk, &imr);
2179 return err;
2180 }
2181
2182 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2183 struct ip_msfilter __user *optval, int __user *optlen)
2184 {
2185 int err, len, count, copycount;
2186 struct ip_mreqn imr;
2187 __be32 addr = msf->imsf_multiaddr;
2188 struct ip_mc_socklist *pmc;
2189 struct in_device *in_dev;
2190 struct inet_sock *inet = inet_sk(sk);
2191 struct ip_sf_socklist *psl;
2192 struct net *net = sock_net(sk);
2193
2194 if (!ipv4_is_multicast(addr))
2195 return -EINVAL;
2196
2197 rtnl_lock();
2198
2199 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2200 imr.imr_address.s_addr = msf->imsf_interface;
2201 imr.imr_ifindex = 0;
2202 in_dev = ip_mc_find_dev(net, &imr);
2203
2204 if (!in_dev) {
2205 err = -ENODEV;
2206 goto done;
2207 }
2208 err = -EADDRNOTAVAIL;
2209
2210 for_each_pmc_rtnl(inet, pmc) {
2211 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2212 pmc->multi.imr_ifindex == imr.imr_ifindex)
2213 break;
2214 }
2215 if (!pmc) /* must have a prior join */
2216 goto done;
2217 msf->imsf_fmode = pmc->sfmode;
2218 psl = rtnl_dereference(pmc->sflist);
2219 rtnl_unlock();
2220 if (!psl) {
2221 len = 0;
2222 count = 0;
2223 } else {
2224 count = psl->sl_count;
2225 }
2226 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2227 len = copycount * sizeof(psl->sl_addr[0]);
2228 msf->imsf_numsrc = count;
2229 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2230 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2231 return -EFAULT;
2232 }
2233 if (len &&
2234 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2235 return -EFAULT;
2236 return 0;
2237 done:
2238 rtnl_unlock();
2239 return err;
2240 }
2241
2242 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2243 struct group_filter __user *optval, int __user *optlen)
2244 {
2245 int err, i, count, copycount;
2246 struct sockaddr_in *psin;
2247 __be32 addr;
2248 struct ip_mc_socklist *pmc;
2249 struct inet_sock *inet = inet_sk(sk);
2250 struct ip_sf_socklist *psl;
2251
2252 psin = (struct sockaddr_in *)&gsf->gf_group;
2253 if (psin->sin_family != AF_INET)
2254 return -EINVAL;
2255 addr = psin->sin_addr.s_addr;
2256 if (!ipv4_is_multicast(addr))
2257 return -EINVAL;
2258
2259 rtnl_lock();
2260
2261 err = -EADDRNOTAVAIL;
2262
2263 for_each_pmc_rtnl(inet, pmc) {
2264 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2265 pmc->multi.imr_ifindex == gsf->gf_interface)
2266 break;
2267 }
2268 if (!pmc) /* must have a prior join */
2269 goto done;
2270 gsf->gf_fmode = pmc->sfmode;
2271 psl = rtnl_dereference(pmc->sflist);
2272 rtnl_unlock();
2273 count = psl ? psl->sl_count : 0;
2274 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2275 gsf->gf_numsrc = count;
2276 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2277 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2278 return -EFAULT;
2279 }
2280 for (i=0; i<copycount; i++) {
2281 struct sockaddr_storage ss;
2282
2283 psin = (struct sockaddr_in *)&ss;
2284 memset(&ss, 0, sizeof(ss));
2285 psin->sin_family = AF_INET;
2286 psin->sin_addr.s_addr = psl->sl_addr[i];
2287 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2288 return -EFAULT;
2289 }
2290 return 0;
2291 done:
2292 rtnl_unlock();
2293 return err;
2294 }
2295
2296 /*
2297 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2298 */
2299 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2300 {
2301 struct inet_sock *inet = inet_sk(sk);
2302 struct ip_mc_socklist *pmc;
2303 struct ip_sf_socklist *psl;
2304 int i;
2305 int ret;
2306
2307 ret = 1;
2308 if (!ipv4_is_multicast(loc_addr))
2309 goto out;
2310
2311 rcu_read_lock();
2312 for_each_pmc_rcu(inet, pmc) {
2313 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2314 pmc->multi.imr_ifindex == dif)
2315 break;
2316 }
2317 ret = inet->mc_all;
2318 if (!pmc)
2319 goto unlock;
2320 psl = rcu_dereference(pmc->sflist);
2321 ret = (pmc->sfmode == MCAST_EXCLUDE);
2322 if (!psl)
2323 goto unlock;
2324
2325 for (i=0; i<psl->sl_count; i++) {
2326 if (psl->sl_addr[i] == rmt_addr)
2327 break;
2328 }
2329 ret = 0;
2330 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2331 goto unlock;
2332 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2333 goto unlock;
2334 ret = 1;
2335 unlock:
2336 rcu_read_unlock();
2337 out:
2338 return ret;
2339 }
2340
2341 /*
2342 * A socket is closing.
2343 */
2344
2345 void ip_mc_drop_socket(struct sock *sk)
2346 {
2347 struct inet_sock *inet = inet_sk(sk);
2348 struct ip_mc_socklist *iml;
2349 struct net *net = sock_net(sk);
2350
2351 if (inet->mc_list == NULL)
2352 return;
2353
2354 rtnl_lock();
2355 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2356 struct in_device *in_dev;
2357
2358 inet->mc_list = iml->next_rcu;
2359 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2360 (void) ip_mc_leave_src(sk, iml, in_dev);
2361 if (in_dev != NULL)
2362 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2363 /* decrease mem now to avoid the memleak warning */
2364 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2365 kfree_rcu(iml, rcu);
2366 }
2367 rtnl_unlock();
2368 }
2369
2370 /* called with rcu_read_lock() */
2371 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2372 {
2373 struct ip_mc_list *im;
2374 struct ip_mc_list __rcu **mc_hash;
2375 struct ip_sf_list *psf;
2376 int rv = 0;
2377
2378 mc_hash = rcu_dereference(in_dev->mc_hash);
2379 if (mc_hash) {
2380 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2381
2382 for (im = rcu_dereference(mc_hash[hash]);
2383 im != NULL;
2384 im = rcu_dereference(im->next_hash)) {
2385 if (im->multiaddr == mc_addr)
2386 break;
2387 }
2388 } else {
2389 for_each_pmc_rcu(in_dev, im) {
2390 if (im->multiaddr == mc_addr)
2391 break;
2392 }
2393 }
2394 if (im && proto == IPPROTO_IGMP) {
2395 rv = 1;
2396 } else if (im) {
2397 if (src_addr) {
2398 for (psf=im->sources; psf; psf=psf->sf_next) {
2399 if (psf->sf_inaddr == src_addr)
2400 break;
2401 }
2402 if (psf)
2403 rv = psf->sf_count[MCAST_INCLUDE] ||
2404 psf->sf_count[MCAST_EXCLUDE] !=
2405 im->sfcount[MCAST_EXCLUDE];
2406 else
2407 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2408 } else
2409 rv = 1; /* unspecified source; tentatively allow */
2410 }
2411 return rv;
2412 }
2413
2414 #if defined(CONFIG_PROC_FS)
2415 struct igmp_mc_iter_state {
2416 struct seq_net_private p;
2417 struct net_device *dev;
2418 struct in_device *in_dev;
2419 };
2420
2421 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2422
2423 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2424 {
2425 struct net *net = seq_file_net(seq);
2426 struct ip_mc_list *im = NULL;
2427 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2428
2429 state->in_dev = NULL;
2430 for_each_netdev_rcu(net, state->dev) {
2431 struct in_device *in_dev;
2432
2433 in_dev = __in_dev_get_rcu(state->dev);
2434 if (!in_dev)
2435 continue;
2436 im = rcu_dereference(in_dev->mc_list);
2437 if (im) {
2438 state->in_dev = in_dev;
2439 break;
2440 }
2441 }
2442 return im;
2443 }
2444
2445 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2446 {
2447 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2448
2449 im = rcu_dereference(im->next_rcu);
2450 while (!im) {
2451 state->dev = next_net_device_rcu(state->dev);
2452 if (!state->dev) {
2453 state->in_dev = NULL;
2454 break;
2455 }
2456 state->in_dev = __in_dev_get_rcu(state->dev);
2457 if (!state->in_dev)
2458 continue;
2459 im = rcu_dereference(state->in_dev->mc_list);
2460 }
2461 return im;
2462 }
2463
2464 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2465 {
2466 struct ip_mc_list *im = igmp_mc_get_first(seq);
2467 if (im)
2468 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2469 --pos;
2470 return pos ? NULL : im;
2471 }
2472
2473 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2474 __acquires(rcu)
2475 {
2476 rcu_read_lock();
2477 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2478 }
2479
2480 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2481 {
2482 struct ip_mc_list *im;
2483 if (v == SEQ_START_TOKEN)
2484 im = igmp_mc_get_first(seq);
2485 else
2486 im = igmp_mc_get_next(seq, v);
2487 ++*pos;
2488 return im;
2489 }
2490
2491 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2492 __releases(rcu)
2493 {
2494 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2495
2496 state->in_dev = NULL;
2497 state->dev = NULL;
2498 rcu_read_unlock();
2499 }
2500
2501 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2502 {
2503 if (v == SEQ_START_TOKEN)
2504 seq_puts(seq,
2505 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2506 else {
2507 struct ip_mc_list *im = (struct ip_mc_list *)v;
2508 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2509 char *querier;
2510 long delta;
2511
2512 #ifdef CONFIG_IP_MULTICAST
2513 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2514 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2515 "V3";
2516 #else
2517 querier = "NONE";
2518 #endif
2519
2520 if (rcu_dereference(state->in_dev->mc_list) == im) {
2521 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2522 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2523 }
2524
2525 delta = im->timer.expires - jiffies;
2526 seq_printf(seq,
2527 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2528 im->multiaddr, im->users,
2529 im->tm_running,
2530 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2531 im->reporter);
2532 }
2533 return 0;
2534 }
2535
2536 static const struct seq_operations igmp_mc_seq_ops = {
2537 .start = igmp_mc_seq_start,
2538 .next = igmp_mc_seq_next,
2539 .stop = igmp_mc_seq_stop,
2540 .show = igmp_mc_seq_show,
2541 };
2542
2543 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2544 {
2545 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2546 sizeof(struct igmp_mc_iter_state));
2547 }
2548
2549 static const struct file_operations igmp_mc_seq_fops = {
2550 .owner = THIS_MODULE,
2551 .open = igmp_mc_seq_open,
2552 .read = seq_read,
2553 .llseek = seq_lseek,
2554 .release = seq_release_net,
2555 };
2556
2557 struct igmp_mcf_iter_state {
2558 struct seq_net_private p;
2559 struct net_device *dev;
2560 struct in_device *idev;
2561 struct ip_mc_list *im;
2562 };
2563
2564 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2565
2566 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2567 {
2568 struct net *net = seq_file_net(seq);
2569 struct ip_sf_list *psf = NULL;
2570 struct ip_mc_list *im = NULL;
2571 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2572
2573 state->idev = NULL;
2574 state->im = NULL;
2575 for_each_netdev_rcu(net, state->dev) {
2576 struct in_device *idev;
2577 idev = __in_dev_get_rcu(state->dev);
2578 if (unlikely(idev == NULL))
2579 continue;
2580 im = rcu_dereference(idev->mc_list);
2581 if (likely(im != NULL)) {
2582 spin_lock_bh(&im->lock);
2583 psf = im->sources;
2584 if (likely(psf != NULL)) {
2585 state->im = im;
2586 state->idev = idev;
2587 break;
2588 }
2589 spin_unlock_bh(&im->lock);
2590 }
2591 }
2592 return psf;
2593 }
2594
2595 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2596 {
2597 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2598
2599 psf = psf->sf_next;
2600 while (!psf) {
2601 spin_unlock_bh(&state->im->lock);
2602 state->im = state->im->next;
2603 while (!state->im) {
2604 state->dev = next_net_device_rcu(state->dev);
2605 if (!state->dev) {
2606 state->idev = NULL;
2607 goto out;
2608 }
2609 state->idev = __in_dev_get_rcu(state->dev);
2610 if (!state->idev)
2611 continue;
2612 state->im = rcu_dereference(state->idev->mc_list);
2613 }
2614 if (!state->im)
2615 break;
2616 spin_lock_bh(&state->im->lock);
2617 psf = state->im->sources;
2618 }
2619 out:
2620 return psf;
2621 }
2622
2623 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2624 {
2625 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2626 if (psf)
2627 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2628 --pos;
2629 return pos ? NULL : psf;
2630 }
2631
2632 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2633 __acquires(rcu)
2634 {
2635 rcu_read_lock();
2636 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2637 }
2638
2639 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2640 {
2641 struct ip_sf_list *psf;
2642 if (v == SEQ_START_TOKEN)
2643 psf = igmp_mcf_get_first(seq);
2644 else
2645 psf = igmp_mcf_get_next(seq, v);
2646 ++*pos;
2647 return psf;
2648 }
2649
2650 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2651 __releases(rcu)
2652 {
2653 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2654 if (likely(state->im != NULL)) {
2655 spin_unlock_bh(&state->im->lock);
2656 state->im = NULL;
2657 }
2658 state->idev = NULL;
2659 state->dev = NULL;
2660 rcu_read_unlock();
2661 }
2662
2663 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2664 {
2665 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2666 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2667
2668 if (v == SEQ_START_TOKEN) {
2669 seq_printf(seq,
2670 "%3s %6s "
2671 "%10s %10s %6s %6s\n", "Idx",
2672 "Device", "MCA",
2673 "SRC", "INC", "EXC");
2674 } else {
2675 seq_printf(seq,
2676 "%3d %6.6s 0x%08x "
2677 "0x%08x %6lu %6lu\n",
2678 state->dev->ifindex, state->dev->name,
2679 ntohl(state->im->multiaddr),
2680 ntohl(psf->sf_inaddr),
2681 psf->sf_count[MCAST_INCLUDE],
2682 psf->sf_count[MCAST_EXCLUDE]);
2683 }
2684 return 0;
2685 }
2686
2687 static const struct seq_operations igmp_mcf_seq_ops = {
2688 .start = igmp_mcf_seq_start,
2689 .next = igmp_mcf_seq_next,
2690 .stop = igmp_mcf_seq_stop,
2691 .show = igmp_mcf_seq_show,
2692 };
2693
2694 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2695 {
2696 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2697 sizeof(struct igmp_mcf_iter_state));
2698 }
2699
2700 static const struct file_operations igmp_mcf_seq_fops = {
2701 .owner = THIS_MODULE,
2702 .open = igmp_mcf_seq_open,
2703 .read = seq_read,
2704 .llseek = seq_lseek,
2705 .release = seq_release_net,
2706 };
2707
2708 static int __net_init igmp_net_init(struct net *net)
2709 {
2710 struct proc_dir_entry *pde;
2711
2712 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2713 if (!pde)
2714 goto out_igmp;
2715 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2716 &igmp_mcf_seq_fops);
2717 if (!pde)
2718 goto out_mcfilter;
2719 return 0;
2720
2721 out_mcfilter:
2722 remove_proc_entry("igmp", net->proc_net);
2723 out_igmp:
2724 return -ENOMEM;
2725 }
2726
2727 static void __net_exit igmp_net_exit(struct net *net)
2728 {
2729 remove_proc_entry("mcfilter", net->proc_net);
2730 remove_proc_entry("igmp", net->proc_net);
2731 }
2732
2733 static struct pernet_operations igmp_net_ops = {
2734 .init = igmp_net_init,
2735 .exit = igmp_net_exit,
2736 };
2737
2738 int __init igmp_mc_proc_init(void)
2739 {
2740 return register_pernet_subsys(&igmp_net_ops);
2741 }
2742 #endif
Linus' kernel tree