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igmp.c
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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 <[email protected]>
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: [email protected] and [email protected]
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 - skb->transport_header;
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 
1221 /*
1222  * A socket has joined a multicast group on device dev.
1223  */
1224 
1225 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1226 {
1227  struct ip_mc_list *im;
1228 
1229  ASSERT_RTNL();
1230 
1231  for_each_pmc_rtnl(in_dev, im) {
1232  if (im->multiaddr == addr) {
1233  im->users++;
1234  ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1235  goto out;
1236  }
1237  }
1238 
1239  im = kzalloc(sizeof(*im), GFP_KERNEL);
1240  if (!im)
1241  goto out;
1242 
1243  im->users = 1;
1244  im->interface = in_dev;
1245  in_dev_hold(in_dev);
1246  im->multiaddr = addr;
1247  /* initial mode is (EX, empty) */
1248  im->sfmode = MCAST_EXCLUDE;
1249  im->sfcount[MCAST_EXCLUDE] = 1;
1250  atomic_set(&im->refcnt, 1);
1251  spin_lock_init(&im->lock);
1252 #ifdef CONFIG_IP_MULTICAST
1253  setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1254  im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1255 #endif
1256 
1257  im->next_rcu = in_dev->mc_list;
1258  in_dev->mc_count++;
1259  rcu_assign_pointer(in_dev->mc_list, im);
1260 
1261 #ifdef CONFIG_IP_MULTICAST
1262  igmpv3_del_delrec(in_dev, im->multiaddr);
1263 #endif
1264  igmp_group_added(im);
1265  if (!in_dev->dead)
1266  ip_rt_multicast_event(in_dev);
1267 out:
1268  return;
1269 }
1270 EXPORT_SYMBOL(ip_mc_inc_group);
1271 
1272 /*
1273  * Resend IGMP JOIN report; used for bonding.
1274  * Called with rcu_read_lock()
1275  */
1276 void ip_mc_rejoin_groups(struct in_device *in_dev)
1277 {
1278 #ifdef CONFIG_IP_MULTICAST
1279  struct ip_mc_list *im;
1280  int type;
1281 
1282  for_each_pmc_rcu(in_dev, im) {
1283  if (im->multiaddr == IGMP_ALL_HOSTS)
1284  continue;
1285 
1286  /* a failover is happening and switches
1287  * must be notified immediately
1288  */
1289  if (IGMP_V1_SEEN(in_dev))
1290  type = IGMP_HOST_MEMBERSHIP_REPORT;
1291  else if (IGMP_V2_SEEN(in_dev))
1292  type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1293  else
1294  type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1295  igmp_send_report(in_dev, im, type);
1296  }
1297 #endif
1298 }
1299 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1300 
1301 /*
1302  * A socket has left a multicast group on device dev
1303  */
1304 
1305 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1306 {
1307  struct ip_mc_list *i;
1308  struct ip_mc_list __rcu **ip;
1309 
1310  ASSERT_RTNL();
1311 
1312  for (ip = &in_dev->mc_list;
1313  (i = rtnl_dereference(*ip)) != NULL;
1314  ip = &i->next_rcu) {
1315  if (i->multiaddr == addr) {
1316  if (--i->users == 0) {
1317  *ip = i->next_rcu;
1318  in_dev->mc_count--;
1319  igmp_group_dropped(i);
1320  ip_mc_clear_src(i);
1321 
1322  if (!in_dev->dead)
1323  ip_rt_multicast_event(in_dev);
1324 
1325  ip_ma_put(i);
1326  return;
1327  }
1328  break;
1329  }
1330  }
1331 }
1332 EXPORT_SYMBOL(ip_mc_dec_group);
1333 
1334 /* Device changing type */
1335 
1336 void ip_mc_unmap(struct in_device *in_dev)
1337 {
1338  struct ip_mc_list *pmc;
1339 
1340  ASSERT_RTNL();
1341 
1342  for_each_pmc_rtnl(in_dev, pmc)
1343  igmp_group_dropped(pmc);
1344 }
1345 
1346 void ip_mc_remap(struct in_device *in_dev)
1347 {
1348  struct ip_mc_list *pmc;
1349 
1350  ASSERT_RTNL();
1351 
1352  for_each_pmc_rtnl(in_dev, pmc)
1353  igmp_group_added(pmc);
1354 }
1355 
1356 /* Device going down */
1357 
1358 void ip_mc_down(struct in_device *in_dev)
1359 {
1360  struct ip_mc_list *pmc;
1361 
1362  ASSERT_RTNL();
1363 
1364  for_each_pmc_rtnl(in_dev, pmc)
1365  igmp_group_dropped(pmc);
1366 
1367 #ifdef CONFIG_IP_MULTICAST
1368  in_dev->mr_ifc_count = 0;
1369  if (del_timer(&in_dev->mr_ifc_timer))
1370  __in_dev_put(in_dev);
1371  in_dev->mr_gq_running = 0;
1372  if (del_timer(&in_dev->mr_gq_timer))
1373  __in_dev_put(in_dev);
1374  igmpv3_clear_delrec(in_dev);
1375 #endif
1376 
1377  ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1378 }
1379 
1380 void ip_mc_init_dev(struct in_device *in_dev)
1381 {
1382  ASSERT_RTNL();
1383 
1384  in_dev->mc_tomb = NULL;
1385 #ifdef CONFIG_IP_MULTICAST
1386  in_dev->mr_gq_running = 0;
1387  setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1388  (unsigned long)in_dev);
1389  in_dev->mr_ifc_count = 0;
1390  in_dev->mc_count = 0;
1391  setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1392  (unsigned long)in_dev);
1393  in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1394 #endif
1395 
1396  spin_lock_init(&in_dev->mc_tomb_lock);
1397 }
1398 
1399 /* Device going up */
1400 
1401 void ip_mc_up(struct in_device *in_dev)
1402 {
1403  struct ip_mc_list *pmc;
1404 
1405  ASSERT_RTNL();
1406 
1407  ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1408 
1409  for_each_pmc_rtnl(in_dev, pmc)
1410  igmp_group_added(pmc);
1411 }
1412 
1413 /*
1414  * Device is about to be destroyed: clean up.
1415  */
1416 
1417 void ip_mc_destroy_dev(struct in_device *in_dev)
1418 {
1419  struct ip_mc_list *i;
1420 
1421  ASSERT_RTNL();
1422 
1423  /* Deactivate timers */
1424  ip_mc_down(in_dev);
1425 
1426  while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1427  in_dev->mc_list = i->next_rcu;
1428  in_dev->mc_count--;
1429 
1430  /* We've dropped the groups in ip_mc_down already */
1431  ip_mc_clear_src(i);
1432  ip_ma_put(i);
1433  }
1434 }
1435 
1436 /* RTNL is locked */
1437 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1438 {
1439  struct net_device *dev = NULL;
1440  struct in_device *idev = NULL;
1441 
1442  if (imr->imr_ifindex) {
1443  idev = inetdev_by_index(net, imr->imr_ifindex);
1444  return idev;
1445  }
1446  if (imr->imr_address.s_addr) {
1447  dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1448  if (!dev)
1449  return NULL;
1450  }
1451 
1452  if (!dev) {
1453  struct rtable *rt = ip_route_output(net,
1454  imr->imr_multiaddr.s_addr,
1455  0, 0, 0);
1456  if (!IS_ERR(rt)) {
1457  dev = rt->dst.dev;
1458  ip_rt_put(rt);
1459  }
1460  }
1461  if (dev) {
1462  imr->imr_ifindex = dev->ifindex;
1463  idev = __in_dev_get_rtnl(dev);
1464  }
1465  return idev;
1466 }
1467 
1468 /*
1469  * Join a socket to a group
1470  */
1471 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1472 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1473 
1474 
1475 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1476  __be32 *psfsrc)
1477 {
1478  struct ip_sf_list *psf, *psf_prev;
1479  int rv = 0;
1480 
1481  psf_prev = NULL;
1482  for (psf=pmc->sources; psf; psf=psf->sf_next) {
1483  if (psf->sf_inaddr == *psfsrc)
1484  break;
1485  psf_prev = psf;
1486  }
1487  if (!psf || psf->sf_count[sfmode] == 0) {
1488  /* source filter not found, or count wrong => bug */
1489  return -ESRCH;
1490  }
1491  psf->sf_count[sfmode]--;
1492  if (psf->sf_count[sfmode] == 0) {
1493  ip_rt_multicast_event(pmc->interface);
1494  }
1495  if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1496 #ifdef CONFIG_IP_MULTICAST
1497  struct in_device *in_dev = pmc->interface;
1498 #endif
1499 
1500  /* no more filters for this source */
1501  if (psf_prev)
1502  psf_prev->sf_next = psf->sf_next;
1503  else
1504  pmc->sources = psf->sf_next;
1505 #ifdef CONFIG_IP_MULTICAST
1506  if (psf->sf_oldin &&
1507  !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1508  psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1509  IGMP_Unsolicited_Report_Count;
1510  psf->sf_next = pmc->tomb;
1511  pmc->tomb = psf;
1512  rv = 1;
1513  } else
1514 #endif
1515  kfree(psf);
1516  }
1517  return rv;
1518 }
1519 
1520 #ifndef CONFIG_IP_MULTICAST
1521 #define igmp_ifc_event(x) do { } while (0)
1522 #endif
1523 
1524 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1525  int sfcount, __be32 *psfsrc, int delta)
1526 {
1527  struct ip_mc_list *pmc;
1528  int changerec = 0;
1529  int i, err;
1530 
1531  if (!in_dev)
1532  return -ENODEV;
1533  rcu_read_lock();
1534  for_each_pmc_rcu(in_dev, pmc) {
1535  if (*pmca == pmc->multiaddr)
1536  break;
1537  }
1538  if (!pmc) {
1539  /* MCA not found?? bug */
1540  rcu_read_unlock();
1541  return -ESRCH;
1542  }
1543  spin_lock_bh(&pmc->lock);
1544  rcu_read_unlock();
1545 #ifdef CONFIG_IP_MULTICAST
1546  sf_markstate(pmc);
1547 #endif
1548  if (!delta) {
1549  err = -EINVAL;
1550  if (!pmc->sfcount[sfmode])
1551  goto out_unlock;
1552  pmc->sfcount[sfmode]--;
1553  }
1554  err = 0;
1555  for (i=0; i<sfcount; i++) {
1556  int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1557 
1558  changerec |= rv > 0;
1559  if (!err && rv < 0)
1560  err = rv;
1561  }
1562  if (pmc->sfmode == MCAST_EXCLUDE &&
1563  pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1564  pmc->sfcount[MCAST_INCLUDE]) {
1565 #ifdef CONFIG_IP_MULTICAST
1566  struct ip_sf_list *psf;
1567 #endif
1568 
1569  /* filter mode change */
1570  pmc->sfmode = MCAST_INCLUDE;
1571 #ifdef CONFIG_IP_MULTICAST
1572  pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1573  IGMP_Unsolicited_Report_Count;
1574  in_dev->mr_ifc_count = pmc->crcount;
1575  for (psf=pmc->sources; psf; psf = psf->sf_next)
1576  psf->sf_crcount = 0;
1577  igmp_ifc_event(pmc->interface);
1578  } else if (sf_setstate(pmc) || changerec) {
1579  igmp_ifc_event(pmc->interface);
1580 #endif
1581  }
1582 out_unlock:
1583  spin_unlock_bh(&pmc->lock);
1584  return err;
1585 }
1586 
1587 /*
1588  * Add multicast single-source filter to the interface list
1589  */
1590 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1591  __be32 *psfsrc)
1592 {
1593  struct ip_sf_list *psf, *psf_prev;
1594 
1595  psf_prev = NULL;
1596  for (psf=pmc->sources; psf; psf=psf->sf_next) {
1597  if (psf->sf_inaddr == *psfsrc)
1598  break;
1599  psf_prev = psf;
1600  }
1601  if (!psf) {
1602  psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1603  if (!psf)
1604  return -ENOBUFS;
1605  psf->sf_inaddr = *psfsrc;
1606  if (psf_prev) {
1607  psf_prev->sf_next = psf;
1608  } else
1609  pmc->sources = psf;
1610  }
1611  psf->sf_count[sfmode]++;
1612  if (psf->sf_count[sfmode] == 1) {
1613  ip_rt_multicast_event(pmc->interface);
1614  }
1615  return 0;
1616 }
1617 
1618 #ifdef CONFIG_IP_MULTICAST
1619 static void sf_markstate(struct ip_mc_list *pmc)
1620 {
1621  struct ip_sf_list *psf;
1622  int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1623 
1624  for (psf=pmc->sources; psf; psf=psf->sf_next)
1625  if (pmc->sfcount[MCAST_EXCLUDE]) {
1626  psf->sf_oldin = mca_xcount ==
1627  psf->sf_count[MCAST_EXCLUDE] &&
1628  !psf->sf_count[MCAST_INCLUDE];
1629  } else
1630  psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1631 }
1632 
1633 static int sf_setstate(struct ip_mc_list *pmc)
1634 {
1635  struct ip_sf_list *psf, *dpsf;
1636  int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1637  int qrv = pmc->interface->mr_qrv;
1638  int new_in, rv;
1639 
1640  rv = 0;
1641  for (psf=pmc->sources; psf; psf=psf->sf_next) {
1642  if (pmc->sfcount[MCAST_EXCLUDE]) {
1643  new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1644  !psf->sf_count[MCAST_INCLUDE];
1645  } else
1646  new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1647  if (new_in) {
1648  if (!psf->sf_oldin) {
1649  struct ip_sf_list *prev = NULL;
1650 
1651  for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1652  if (dpsf->sf_inaddr == psf->sf_inaddr)
1653  break;
1654  prev = dpsf;
1655  }
1656  if (dpsf) {
1657  if (prev)
1658  prev->sf_next = dpsf->sf_next;
1659  else
1660  pmc->tomb = dpsf->sf_next;
1661  kfree(dpsf);
1662  }
1663  psf->sf_crcount = qrv;
1664  rv++;
1665  }
1666  } else if (psf->sf_oldin) {
1667 
1668  psf->sf_crcount = 0;
1669  /*
1670  * add or update "delete" records if an active filter
1671  * is now inactive
1672  */
1673  for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1674  if (dpsf->sf_inaddr == psf->sf_inaddr)
1675  break;
1676  if (!dpsf) {
1677  dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1678  if (!dpsf)
1679  continue;
1680  *dpsf = *psf;
1681  /* pmc->lock held by callers */
1682  dpsf->sf_next = pmc->tomb;
1683  pmc->tomb = dpsf;
1684  }
1685  dpsf->sf_crcount = qrv;
1686  rv++;
1687  }
1688  }
1689  return rv;
1690 }
1691 #endif
1692 
1693 /*
1694  * Add multicast source filter list to the interface list
1695  */
1696 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1697  int sfcount, __be32 *psfsrc, int delta)
1698 {
1699  struct ip_mc_list *pmc;
1700  int isexclude;
1701  int i, err;
1702 
1703  if (!in_dev)
1704  return -ENODEV;
1705  rcu_read_lock();
1706  for_each_pmc_rcu(in_dev, pmc) {
1707  if (*pmca == pmc->multiaddr)
1708  break;
1709  }
1710  if (!pmc) {
1711  /* MCA not found?? bug */
1712  rcu_read_unlock();
1713  return -ESRCH;
1714  }
1715  spin_lock_bh(&pmc->lock);
1716  rcu_read_unlock();
1717 
1718 #ifdef CONFIG_IP_MULTICAST
1719  sf_markstate(pmc);
1720 #endif
1721  isexclude = pmc->sfmode == MCAST_EXCLUDE;
1722  if (!delta)
1723  pmc->sfcount[sfmode]++;
1724  err = 0;
1725  for (i=0; i<sfcount; i++) {
1726  err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1727  if (err)
1728  break;
1729  }
1730  if (err) {
1731  int j;
1732 
1733  if (!delta)
1734  pmc->sfcount[sfmode]--;
1735  for (j=0; j<i; j++)
1736  (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1737  } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1738 #ifdef CONFIG_IP_MULTICAST
1739  struct ip_sf_list *psf;
1740  in_dev = pmc->interface;
1741 #endif
1742 
1743  /* filter mode change */
1744  if (pmc->sfcount[MCAST_EXCLUDE])
1745  pmc->sfmode = MCAST_EXCLUDE;
1746  else if (pmc->sfcount[MCAST_INCLUDE])
1747  pmc->sfmode = MCAST_INCLUDE;
1748 #ifdef CONFIG_IP_MULTICAST
1749  /* else no filters; keep old mode for reports */
1750 
1751  pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1752  IGMP_Unsolicited_Report_Count;
1753  in_dev->mr_ifc_count = pmc->crcount;
1754  for (psf=pmc->sources; psf; psf = psf->sf_next)
1755  psf->sf_crcount = 0;
1756  igmp_ifc_event(in_dev);
1757  } else if (sf_setstate(pmc)) {
1758  igmp_ifc_event(in_dev);
1759 #endif
1760  }
1761  spin_unlock_bh(&pmc->lock);
1762  return err;
1763 }
1764 
1765 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1766 {
1767  struct ip_sf_list *psf, *nextpsf;
1768 
1769  for (psf=pmc->tomb; psf; psf=nextpsf) {
1770  nextpsf = psf->sf_next;
1771  kfree(psf);
1772  }
1773  pmc->tomb = NULL;
1774  for (psf=pmc->sources; psf; psf=nextpsf) {
1775  nextpsf = psf->sf_next;
1776  kfree(psf);
1777  }
1778  pmc->sources = NULL;
1779  pmc->sfmode = MCAST_EXCLUDE;
1780  pmc->sfcount[MCAST_INCLUDE] = 0;
1781  pmc->sfcount[MCAST_EXCLUDE] = 1;
1782 }
1783 
1784 
1785 /*
1786  * Join a multicast group
1787  */
1788 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1789 {
1790  int err;
1791  __be32 addr = imr->imr_multiaddr.s_addr;
1792  struct ip_mc_socklist *iml = NULL, *i;
1793  struct in_device *in_dev;
1794  struct inet_sock *inet = inet_sk(sk);
1795  struct net *net = sock_net(sk);
1796  int ifindex;
1797  int count = 0;
1798 
1799  if (!ipv4_is_multicast(addr))
1800  return -EINVAL;
1801 
1802  rtnl_lock();
1803 
1804  in_dev = ip_mc_find_dev(net, imr);
1805 
1806  if (!in_dev) {
1807  iml = NULL;
1808  err = -ENODEV;
1809  goto done;
1810  }
1811 
1812  err = -EADDRINUSE;
1813  ifindex = imr->imr_ifindex;
1814  for_each_pmc_rtnl(inet, i) {
1815  if (i->multi.imr_multiaddr.s_addr == addr &&
1816  i->multi.imr_ifindex == ifindex)
1817  goto done;
1818  count++;
1819  }
1820  err = -ENOBUFS;
1821  if (count >= sysctl_igmp_max_memberships)
1822  goto done;
1823  iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1824  if (iml == NULL)
1825  goto done;
1826 
1827  memcpy(&iml->multi, imr, sizeof(*imr));
1828  iml->next_rcu = inet->mc_list;
1829  iml->sflist = NULL;
1830  iml->sfmode = MCAST_EXCLUDE;
1831  rcu_assign_pointer(inet->mc_list, iml);
1832  ip_mc_inc_group(in_dev, addr);
1833  err = 0;
1834 done:
1835  rtnl_unlock();
1836  return err;
1837 }
1838 EXPORT_SYMBOL(ip_mc_join_group);
1839 
1840 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1841  struct in_device *in_dev)
1842 {
1843  struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1844  int err;
1845 
1846  if (psf == NULL) {
1847  /* any-source empty exclude case */
1848  return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1849  iml->sfmode, 0, NULL, 0);
1850  }
1851  err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1852  iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1853  RCU_INIT_POINTER(iml->sflist, NULL);
1854  /* decrease mem now to avoid the memleak warning */
1855  atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1856  kfree_rcu(psf, rcu);
1857  return err;
1858 }
1859 
1860 /*
1861  * Ask a socket to leave a group.
1862  */
1863 
1864 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1865 {
1866  struct inet_sock *inet = inet_sk(sk);
1867  struct ip_mc_socklist *iml;
1868  struct ip_mc_socklist __rcu **imlp;
1869  struct in_device *in_dev;
1870  struct net *net = sock_net(sk);
1871  __be32 group = imr->imr_multiaddr.s_addr;
1872  u32 ifindex;
1873  int ret = -EADDRNOTAVAIL;
1874 
1875  rtnl_lock();
1876  in_dev = ip_mc_find_dev(net, imr);
1877  ifindex = imr->imr_ifindex;
1878  for (imlp = &inet->mc_list;
1879  (iml = rtnl_dereference(*imlp)) != NULL;
1880  imlp = &iml->next_rcu) {
1881  if (iml->multi.imr_multiaddr.s_addr != group)
1882  continue;
1883  if (ifindex) {
1884  if (iml->multi.imr_ifindex != ifindex)
1885  continue;
1886  } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1887  iml->multi.imr_address.s_addr)
1888  continue;
1889 
1890  (void) ip_mc_leave_src(sk, iml, in_dev);
1891 
1892  *imlp = iml->next_rcu;
1893 
1894  if (in_dev)
1895  ip_mc_dec_group(in_dev, group);
1896  rtnl_unlock();
1897  /* decrease mem now to avoid the memleak warning */
1898  atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1899  kfree_rcu(iml, rcu);
1900  return 0;
1901  }
1902  if (!in_dev)
1903  ret = -ENODEV;
1904  rtnl_unlock();
1905  return ret;
1906 }
1907 EXPORT_SYMBOL(ip_mc_leave_group);
1908 
1909 int ip_mc_source(int add, int omode, struct sock *sk, struct
1910  ip_mreq_source *mreqs, int ifindex)
1911 {
1912  int err;
1913  struct ip_mreqn imr;
1914  __be32 addr = mreqs->imr_multiaddr;
1915  struct ip_mc_socklist *pmc;
1916  struct in_device *in_dev = NULL;
1917  struct inet_sock *inet = inet_sk(sk);
1918  struct ip_sf_socklist *psl;
1919  struct net *net = sock_net(sk);
1920  int leavegroup = 0;
1921  int i, j, rv;
1922 
1923  if (!ipv4_is_multicast(addr))
1924  return -EINVAL;
1925 
1926  rtnl_lock();
1927 
1928  imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1929  imr.imr_address.s_addr = mreqs->imr_interface;
1930  imr.imr_ifindex = ifindex;
1931  in_dev = ip_mc_find_dev(net, &imr);
1932 
1933  if (!in_dev) {
1934  err = -ENODEV;
1935  goto done;
1936  }
1937  err = -EADDRNOTAVAIL;
1938 
1939  for_each_pmc_rtnl(inet, pmc) {
1940  if ((pmc->multi.imr_multiaddr.s_addr ==
1941  imr.imr_multiaddr.s_addr) &&
1942  (pmc->multi.imr_ifindex == imr.imr_ifindex))
1943  break;
1944  }
1945  if (!pmc) { /* must have a prior join */
1946  err = -EINVAL;
1947  goto done;
1948  }
1949  /* if a source filter was set, must be the same mode as before */
1950  if (pmc->sflist) {
1951  if (pmc->sfmode != omode) {
1952  err = -EINVAL;
1953  goto done;
1954  }
1955  } else if (pmc->sfmode != omode) {
1956  /* allow mode switches for empty-set filters */
1957  ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1958  ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1959  NULL, 0);
1960  pmc->sfmode = omode;
1961  }
1962 
1963  psl = rtnl_dereference(pmc->sflist);
1964  if (!add) {
1965  if (!psl)
1966  goto done; /* err = -EADDRNOTAVAIL */
1967  rv = !0;
1968  for (i=0; i<psl->sl_count; i++) {
1969  rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1970  sizeof(__be32));
1971  if (rv == 0)
1972  break;
1973  }
1974  if (rv) /* source not found */
1975  goto done; /* err = -EADDRNOTAVAIL */
1976 
1977  /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1978  if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1979  leavegroup = 1;
1980  goto done;
1981  }
1982 
1983  /* update the interface filter */
1984  ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1985  &mreqs->imr_sourceaddr, 1);
1986 
1987  for (j=i+1; j<psl->sl_count; j++)
1988  psl->sl_addr[j-1] = psl->sl_addr[j];
1989  psl->sl_count--;
1990  err = 0;
1991  goto done;
1992  }
1993  /* else, add a new source to the filter */
1994 
1995  if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1996  err = -ENOBUFS;
1997  goto done;
1998  }
1999  if (!psl || psl->sl_count == psl->sl_max) {
2000  struct ip_sf_socklist *newpsl;
2001  int count = IP_SFBLOCK;
2002 
2003  if (psl)
2004  count += psl->sl_max;
2005  newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2006  if (!newpsl) {
2007  err = -ENOBUFS;
2008  goto done;
2009  }
2010  newpsl->sl_max = count;
2011  newpsl->sl_count = count - IP_SFBLOCK;
2012  if (psl) {
2013  for (i=0; i<psl->sl_count; i++)
2014  newpsl->sl_addr[i] = psl->sl_addr[i];
2015  /* decrease mem now to avoid the memleak warning */
2016  atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2017  kfree_rcu(psl, rcu);
2018  }
2019  rcu_assign_pointer(pmc->sflist, newpsl);
2020  psl = newpsl;
2021  }
2022  rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2023  for (i=0; i<psl->sl_count; i++) {
2024  rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2025  sizeof(__be32));
2026  if (rv == 0)
2027  break;
2028  }
2029  if (rv == 0) /* address already there is an error */
2030  goto done;
2031  for (j=psl->sl_count-1; j>=i; j--)
2032  psl->sl_addr[j+1] = psl->sl_addr[j];
2033  psl->sl_addr[i] = mreqs->imr_sourceaddr;
2034  psl->sl_count++;
2035  err = 0;
2036  /* update the interface list */
2037  ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2038  &mreqs->imr_sourceaddr, 1);
2039 done:
2040  rtnl_unlock();
2041  if (leavegroup)
2042  return ip_mc_leave_group(sk, &imr);
2043  return err;
2044 }
2045 
2046 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2047 {
2048  int err = 0;
2049  struct ip_mreqn imr;
2050  __be32 addr = msf->imsf_multiaddr;
2051  struct ip_mc_socklist *pmc;
2052  struct in_device *in_dev;
2053  struct inet_sock *inet = inet_sk(sk);
2054  struct ip_sf_socklist *newpsl, *psl;
2055  struct net *net = sock_net(sk);
2056  int leavegroup = 0;
2057 
2058  if (!ipv4_is_multicast(addr))
2059  return -EINVAL;
2060  if (msf->imsf_fmode != MCAST_INCLUDE &&
2061  msf->imsf_fmode != MCAST_EXCLUDE)
2062  return -EINVAL;
2063 
2064  rtnl_lock();
2065 
2066  imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2067  imr.imr_address.s_addr = msf->imsf_interface;
2068  imr.imr_ifindex = ifindex;
2069  in_dev = ip_mc_find_dev(net, &imr);
2070 
2071  if (!in_dev) {
2072  err = -ENODEV;
2073  goto done;
2074  }
2075 
2076  /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2077  if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2078  leavegroup = 1;
2079  goto done;
2080  }
2081 
2082  for_each_pmc_rtnl(inet, pmc) {
2083  if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2084  pmc->multi.imr_ifindex == imr.imr_ifindex)
2085  break;
2086  }
2087  if (!pmc) { /* must have a prior join */
2088  err = -EINVAL;
2089  goto done;
2090  }
2091  if (msf->imsf_numsrc) {
2092  newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2093  GFP_KERNEL);
2094  if (!newpsl) {
2095  err = -ENOBUFS;
2096  goto done;
2097  }
2098  newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2099  memcpy(newpsl->sl_addr, msf->imsf_slist,
2100  msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2101  err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2102  msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2103  if (err) {
2104  sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2105  goto done;
2106  }
2107  } else {
2108  newpsl = NULL;
2109  (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2110  msf->imsf_fmode, 0, NULL, 0);
2111  }
2112  psl = rtnl_dereference(pmc->sflist);
2113  if (psl) {
2114  (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2115  psl->sl_count, psl->sl_addr, 0);
2116  /* decrease mem now to avoid the memleak warning */
2117  atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2118  kfree_rcu(psl, rcu);
2119  } else
2120  (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2121  0, NULL, 0);
2122  rcu_assign_pointer(pmc->sflist, newpsl);
2123  pmc->sfmode = msf->imsf_fmode;
2124  err = 0;
2125 done:
2126  rtnl_unlock();
2127  if (leavegroup)
2128  err = ip_mc_leave_group(sk, &imr);
2129  return err;
2130 }
2131 
2132 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2133  struct ip_msfilter __user *optval, int __user *optlen)
2134 {
2135  int err, len, count, copycount;
2136  struct ip_mreqn imr;
2137  __be32 addr = msf->imsf_multiaddr;
2138  struct ip_mc_socklist *pmc;
2139  struct in_device *in_dev;
2140  struct inet_sock *inet = inet_sk(sk);
2141  struct ip_sf_socklist *psl;
2142  struct net *net = sock_net(sk);
2143 
2144  if (!ipv4_is_multicast(addr))
2145  return -EINVAL;
2146 
2147  rtnl_lock();
2148 
2149  imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2150  imr.imr_address.s_addr = msf->imsf_interface;
2151  imr.imr_ifindex = 0;
2152  in_dev = ip_mc_find_dev(net, &imr);
2153 
2154  if (!in_dev) {
2155  err = -ENODEV;
2156  goto done;
2157  }
2158  err = -EADDRNOTAVAIL;
2159 
2160  for_each_pmc_rtnl(inet, pmc) {
2161  if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2162  pmc->multi.imr_ifindex == imr.imr_ifindex)
2163  break;
2164  }
2165  if (!pmc) /* must have a prior join */
2166  goto done;
2167  msf->imsf_fmode = pmc->sfmode;
2168  psl = rtnl_dereference(pmc->sflist);
2169  rtnl_unlock();
2170  if (!psl) {
2171  len = 0;
2172  count = 0;
2173  } else {
2174  count = psl->sl_count;
2175  }
2176  copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2177  len = copycount * sizeof(psl->sl_addr[0]);
2178  msf->imsf_numsrc = count;
2179  if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2180  copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2181  return -EFAULT;
2182  }
2183  if (len &&
2184  copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2185  return -EFAULT;
2186  return 0;
2187 done:
2188  rtnl_unlock();
2189  return err;
2190 }
2191 
2192 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2193  struct group_filter __user *optval, int __user *optlen)
2194 {
2195  int err, i, count, copycount;
2196  struct sockaddr_in *psin;
2197  __be32 addr;
2198  struct ip_mc_socklist *pmc;
2199  struct inet_sock *inet = inet_sk(sk);
2200  struct ip_sf_socklist *psl;
2201 
2202  psin = (struct sockaddr_in *)&gsf->gf_group;
2203  if (psin->sin_family != AF_INET)
2204  return -EINVAL;
2205  addr = psin->sin_addr.s_addr;
2206  if (!ipv4_is_multicast(addr))
2207  return -EINVAL;
2208 
2209  rtnl_lock();
2210 
2211  err = -EADDRNOTAVAIL;
2212 
2213  for_each_pmc_rtnl(inet, pmc) {
2214  if (pmc->multi.imr_multiaddr.s_addr == addr &&
2215  pmc->multi.imr_ifindex == gsf->gf_interface)
2216  break;
2217  }
2218  if (!pmc) /* must have a prior join */
2219  goto done;
2220  gsf->gf_fmode = pmc->sfmode;
2221  psl = rtnl_dereference(pmc->sflist);
2222  rtnl_unlock();
2223  count = psl ? psl->sl_count : 0;
2224  copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2225  gsf->gf_numsrc = count;
2226  if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2227  copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2228  return -EFAULT;
2229  }
2230  for (i=0; i<copycount; i++) {
2231  struct sockaddr_storage ss;
2232 
2233  psin = (struct sockaddr_in *)&ss;
2234  memset(&ss, 0, sizeof(ss));
2235  psin->sin_family = AF_INET;
2236  psin->sin_addr.s_addr = psl->sl_addr[i];
2237  if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2238  return -EFAULT;
2239  }
2240  return 0;
2241 done:
2242  rtnl_unlock();
2243  return err;
2244 }
2245 
2246 /*
2247  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2248  */
2249 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2250 {
2251  struct inet_sock *inet = inet_sk(sk);
2252  struct ip_mc_socklist *pmc;
2253  struct ip_sf_socklist *psl;
2254  int i;
2255  int ret;
2256 
2257  ret = 1;
2258  if (!ipv4_is_multicast(loc_addr))
2259  goto out;
2260 
2261  rcu_read_lock();
2262  for_each_pmc_rcu(inet, pmc) {
2263  if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2264  pmc->multi.imr_ifindex == dif)
2265  break;
2266  }
2267  ret = inet->mc_all;
2268  if (!pmc)
2269  goto unlock;
2270  psl = rcu_dereference(pmc->sflist);
2271  ret = (pmc->sfmode == MCAST_EXCLUDE);
2272  if (!psl)
2273  goto unlock;
2274 
2275  for (i=0; i<psl->sl_count; i++) {
2276  if (psl->sl_addr[i] == rmt_addr)
2277  break;
2278  }
2279  ret = 0;
2280  if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2281  goto unlock;
2282  if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2283  goto unlock;
2284  ret = 1;
2285 unlock:
2286  rcu_read_unlock();
2287 out:
2288  return ret;
2289 }
2290 
2291 /*
2292  * A socket is closing.
2293  */
2294 
2295 void ip_mc_drop_socket(struct sock *sk)
2296 {
2297  struct inet_sock *inet = inet_sk(sk);
2298  struct ip_mc_socklist *iml;
2299  struct net *net = sock_net(sk);
2300 
2301  if (inet->mc_list == NULL)
2302  return;
2303 
2304  rtnl_lock();
2305  while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2306  struct in_device *in_dev;
2307 
2308  inet->mc_list = iml->next_rcu;
2309  in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2310  (void) ip_mc_leave_src(sk, iml, in_dev);
2311  if (in_dev != NULL)
2312  ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2313  /* decrease mem now to avoid the memleak warning */
2314  atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2315  kfree_rcu(iml, rcu);
2316  }
2317  rtnl_unlock();
2318 }
2319 
2320 /* called with rcu_read_lock() */
2321 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2322 {
2323  struct ip_mc_list *im;
2324  struct ip_sf_list *psf;
2325  int rv = 0;
2326 
2327  for_each_pmc_rcu(in_dev, im) {
2328  if (im->multiaddr == mc_addr)
2329  break;
2330  }
2331  if (im && proto == IPPROTO_IGMP) {
2332  rv = 1;
2333  } else if (im) {
2334  if (src_addr) {
2335  for (psf=im->sources; psf; psf=psf->sf_next) {
2336  if (psf->sf_inaddr == src_addr)
2337  break;
2338  }
2339  if (psf)
2340  rv = psf->sf_count[MCAST_INCLUDE] ||
2341  psf->sf_count[MCAST_EXCLUDE] !=
2342  im->sfcount[MCAST_EXCLUDE];
2343  else
2344  rv = im->sfcount[MCAST_EXCLUDE] != 0;
2345  } else
2346  rv = 1; /* unspecified source; tentatively allow */
2347  }
2348  return rv;
2349 }
2350 
2351 #if defined(CONFIG_PROC_FS)
2352 struct igmp_mc_iter_state {
2353  struct seq_net_private p;
2354  struct net_device *dev;
2355  struct in_device *in_dev;
2356 };
2357 
2358 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2359 
2360 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2361 {
2362  struct net *net = seq_file_net(seq);
2363  struct ip_mc_list *im = NULL;
2364  struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2365 
2366  state->in_dev = NULL;
2367  for_each_netdev_rcu(net, state->dev) {
2368  struct in_device *in_dev;
2369 
2370  in_dev = __in_dev_get_rcu(state->dev);
2371  if (!in_dev)
2372  continue;
2373  im = rcu_dereference(in_dev->mc_list);
2374  if (im) {
2375  state->in_dev = in_dev;
2376  break;
2377  }
2378  }
2379  return im;
2380 }
2381 
2382 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2383 {
2384  struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2385 
2386  im = rcu_dereference(im->next_rcu);
2387  while (!im) {
2388  state->dev = next_net_device_rcu(state->dev);
2389  if (!state->dev) {
2390  state->in_dev = NULL;
2391  break;
2392  }
2393  state->in_dev = __in_dev_get_rcu(state->dev);
2394  if (!state->in_dev)
2395  continue;
2396  im = rcu_dereference(state->in_dev->mc_list);
2397  }
2398  return im;
2399 }
2400 
2401 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2402 {
2403  struct ip_mc_list *im = igmp_mc_get_first(seq);
2404  if (im)
2405  while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2406  --pos;
2407  return pos ? NULL : im;
2408 }
2409 
2410 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2411  __acquires(rcu)
2412 {
2413  rcu_read_lock();
2414  return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2415 }
2416 
2417 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2418 {
2419  struct ip_mc_list *im;
2420  if (v == SEQ_START_TOKEN)
2421  im = igmp_mc_get_first(seq);
2422  else
2423  im = igmp_mc_get_next(seq, v);
2424  ++*pos;
2425  return im;
2426 }
2427 
2428 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2429  __releases(rcu)
2430 {
2431  struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2432 
2433  state->in_dev = NULL;
2434  state->dev = NULL;
2435  rcu_read_unlock();
2436 }
2437 
2438 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2439 {
2440  if (v == SEQ_START_TOKEN)
2441  seq_puts(seq,
2442  "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2443  else {
2444  struct ip_mc_list *im = (struct ip_mc_list *)v;
2445  struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2446  char *querier;
2447  long delta;
2448 
2449 #ifdef CONFIG_IP_MULTICAST
2450  querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2451  IGMP_V2_SEEN(state->in_dev) ? "V2" :
2452  "V3";
2453 #else
2454  querier = "NONE";
2455 #endif
2456 
2457  if (rcu_dereference(state->in_dev->mc_list) == im) {
2458  seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2459  state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2460  }
2461 
2462  delta = im->timer.expires - jiffies;
2463  seq_printf(seq,
2464  "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2465  im->multiaddr, im->users,
2466  im->tm_running,
2467  im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2468  im->reporter);
2469  }
2470  return 0;
2471 }
2472 
2473 static const struct seq_operations igmp_mc_seq_ops = {
2474  .start = igmp_mc_seq_start,
2475  .next = igmp_mc_seq_next,
2476  .stop = igmp_mc_seq_stop,
2477  .show = igmp_mc_seq_show,
2478 };
2479 
2480 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2481 {
2482  return seq_open_net(inode, file, &igmp_mc_seq_ops,
2483  sizeof(struct igmp_mc_iter_state));
2484 }
2485 
2486 static const struct file_operations igmp_mc_seq_fops = {
2487  .owner = THIS_MODULE,
2488  .open = igmp_mc_seq_open,
2489  .read = seq_read,
2490  .llseek = seq_lseek,
2491  .release = seq_release_net,
2492 };
2493 
2494 struct igmp_mcf_iter_state {
2495  struct seq_net_private p;
2496  struct net_device *dev;
2497  struct in_device *idev;
2498  struct ip_mc_list *im;
2499 };
2500 
2501 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2502 
2503 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2504 {
2505  struct net *net = seq_file_net(seq);
2506  struct ip_sf_list *psf = NULL;
2507  struct ip_mc_list *im = NULL;
2508  struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2509 
2510  state->idev = NULL;
2511  state->im = NULL;
2512  for_each_netdev_rcu(net, state->dev) {
2513  struct in_device *idev;
2514  idev = __in_dev_get_rcu(state->dev);
2515  if (unlikely(idev == NULL))
2516  continue;
2517  im = rcu_dereference(idev->mc_list);
2518  if (likely(im != NULL)) {
2519  spin_lock_bh(&im->lock);
2520  psf = im->sources;
2521  if (likely(psf != NULL)) {
2522  state->im = im;
2523  state->idev = idev;
2524  break;
2525  }
2526  spin_unlock_bh(&im->lock);
2527  }
2528  }
2529  return psf;
2530 }
2531 
2532 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2533 {
2534  struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2535 
2536  psf = psf->sf_next;
2537  while (!psf) {
2538  spin_unlock_bh(&state->im->lock);
2539  state->im = state->im->next;
2540  while (!state->im) {
2541  state->dev = next_net_device_rcu(state->dev);
2542  if (!state->dev) {
2543  state->idev = NULL;
2544  goto out;
2545  }
2546  state->idev = __in_dev_get_rcu(state->dev);
2547  if (!state->idev)
2548  continue;
2549  state->im = rcu_dereference(state->idev->mc_list);
2550  }
2551  if (!state->im)
2552  break;
2553  spin_lock_bh(&state->im->lock);
2554  psf = state->im->sources;
2555  }
2556 out:
2557  return psf;
2558 }
2559 
2560 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2561 {
2562  struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2563  if (psf)
2564  while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2565  --pos;
2566  return pos ? NULL : psf;
2567 }
2568 
2569 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2570  __acquires(rcu)
2571 {
2572  rcu_read_lock();
2573  return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2574 }
2575 
2576 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2577 {
2578  struct ip_sf_list *psf;
2579  if (v == SEQ_START_TOKEN)
2580  psf = igmp_mcf_get_first(seq);
2581  else
2582  psf = igmp_mcf_get_next(seq, v);
2583  ++*pos;
2584  return psf;
2585 }
2586 
2587 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2588  __releases(rcu)
2589 {
2590  struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2591  if (likely(state->im != NULL)) {
2592  spin_unlock_bh(&state->im->lock);
2593  state->im = NULL;
2594  }
2595  state->idev = NULL;
2596  state->dev = NULL;
2597  rcu_read_unlock();
2598 }
2599 
2600 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2601 {
2602  struct ip_sf_list *psf = (struct ip_sf_list *)v;
2603  struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2604 
2605  if (v == SEQ_START_TOKEN) {
2606  seq_printf(seq,
2607  "%3s %6s "
2608  "%10s %10s %6s %6s\n", "Idx",
2609  "Device", "MCA",
2610  "SRC", "INC", "EXC");
2611  } else {
2612  seq_printf(seq,
2613  "%3d %6.6s 0x%08x "
2614  "0x%08x %6lu %6lu\n",
2615  state->dev->ifindex, state->dev->name,
2616  ntohl(state->im->multiaddr),
2617  ntohl(psf->sf_inaddr),
2618  psf->sf_count[MCAST_INCLUDE],
2619  psf->sf_count[MCAST_EXCLUDE]);
2620  }
2621  return 0;
2622 }
2623 
2624 static const struct seq_operations igmp_mcf_seq_ops = {
2625  .start = igmp_mcf_seq_start,
2626  .next = igmp_mcf_seq_next,
2627  .stop = igmp_mcf_seq_stop,
2628  .show = igmp_mcf_seq_show,
2629 };
2630 
2631 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2632 {
2633  return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2634  sizeof(struct igmp_mcf_iter_state));
2635 }
2636 
2637 static const struct file_operations igmp_mcf_seq_fops = {
2638  .owner = THIS_MODULE,
2639  .open = igmp_mcf_seq_open,
2640  .read = seq_read,
2641  .llseek = seq_lseek,
2642  .release = seq_release_net,
2643 };
2644 
2645 static int __net_init igmp_net_init(struct net *net)
2646 {
2647  struct proc_dir_entry *pde;
2648 
2649  pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2650  if (!pde)
2651  goto out_igmp;
2652  pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2653  if (!pde)
2654  goto out_mcfilter;
2655  return 0;
2656 
2657 out_mcfilter:
2658  proc_net_remove(net, "igmp");
2659 out_igmp:
2660  return -ENOMEM;
2661 }
2662 
2663 static void __net_exit igmp_net_exit(struct net *net)
2664 {
2665  proc_net_remove(net, "mcfilter");
2666  proc_net_remove(net, "igmp");
2667 }
2668 
2669 static struct pernet_operations igmp_net_ops = {
2670  .init = igmp_net_init,
2671  .exit = igmp_net_exit,
2672 };
2673 
2674 int __init igmp_mc_proc_init(void)
2675 {
2676  return register_pernet_subsys(&igmp_net_ops);
2677 }
2678 #endif
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