d577199eabd5c3f179acd8e3d7f6602837fb8b5b
[linux-2.6.git] / net / ipv4 / igmp.c
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 <asm/system.h>
77 #include <linux/types.h>
78 #include <linux/kernel.h>
79 #include <linux/jiffies.h>
80 #include <linux/string.h>
81 #include <linux/socket.h>
82 #include <linux/sockios.h>
83 #include <linux/in.h>
84 #include <linux/inet.h>
85 #include <linux/netdevice.h>
86 #include <linux/skbuff.h>
87 #include <linux/inetdevice.h>
88 #include <linux/igmp.h>
89 #include <linux/if_arp.h>
90 #include <linux/rtnetlink.h>
91 #include <linux/times.h>
92
93 #include <net/net_namespace.h>
94 #include <net/arp.h>
95 #include <net/ip.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
98 #include <net/sock.h>
99 #include <net/checksum.h>
100 #include <linux/netfilter_ipv4.h>
101 #ifdef CONFIG_IP_MROUTE
102 #include <linux/mroute.h>
103 #endif
104 #ifdef CONFIG_PROC_FS
105 #include <linux/proc_fs.h>
106 #include <linux/seq_file.h>
107 #endif
108
109 #define IP_MAX_MEMBERSHIPS      20
110 #define IP_MAX_MSF              10
111
112 #ifdef CONFIG_IP_MULTICAST
113 /* Parameter names and values are taken from igmp-v2-06 draft */
114
115 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
116 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
117 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
118 #define IGMP_Query_Response_Interval            (10*HZ)
119 #define IGMP_Unsolicited_Report_Count           2
120
121
122 #define IGMP_Initial_Report_Delay               (1)
123
124 /* IGMP_Initial_Report_Delay is not from IGMP specs!
125  * IGMP specs require to report membership immediately after
126  * joining a group, but we delay the first report by a
127  * small interval. It seems more natural and still does not
128  * contradict to specs provided this delay is small enough.
129  */
130
131 #define IGMP_V1_SEEN(in_dev) \
132         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
133          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
134          ((in_dev)->mr_v1_seen && \
135           time_before(jiffies, (in_dev)->mr_v1_seen)))
136 #define IGMP_V2_SEEN(in_dev) \
137         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
138          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
139          ((in_dev)->mr_v2_seen && \
140           time_before(jiffies, (in_dev)->mr_v2_seen)))
141
142 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
143 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
144 static void igmpv3_clear_delrec(struct in_device *in_dev);
145 static int sf_setstate(struct ip_mc_list *pmc);
146 static void sf_markstate(struct ip_mc_list *pmc);
147 #endif
148 static void ip_mc_clear_src(struct ip_mc_list *pmc);
149 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
150                          int sfcount, __be32 *psfsrc, int delta);
151
152 static void ip_ma_put(struct ip_mc_list *im)
153 {
154         if (atomic_dec_and_test(&im->refcnt)) {
155                 in_dev_put(im->interface);
156                 kfree_rcu(im, rcu);
157         }
158 }
159
160 #define for_each_pmc_rcu(in_dev, pmc)                           \
161         for (pmc = rcu_dereference(in_dev->mc_list);            \
162              pmc != NULL;                                       \
163              pmc = rcu_dereference(pmc->next_rcu))
164
165 #define for_each_pmc_rtnl(in_dev, pmc)                          \
166         for (pmc = rtnl_dereference(in_dev->mc_list);           \
167              pmc != NULL;                                       \
168              pmc = rtnl_dereference(pmc->next_rcu))
169
170 #ifdef CONFIG_IP_MULTICAST
171
172 /*
173  *      Timer management
174  */
175
176 static void igmp_stop_timer(struct ip_mc_list *im)
177 {
178         spin_lock_bh(&im->lock);
179         if (del_timer(&im->timer))
180                 atomic_dec(&im->refcnt);
181         im->tm_running = 0;
182         im->reporter = 0;
183         im->unsolicit_count = 0;
184         spin_unlock_bh(&im->lock);
185 }
186
187 /* It must be called with locked im->lock */
188 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
189 {
190         int tv = net_random() % max_delay;
191
192         im->tm_running = 1;
193         if (!mod_timer(&im->timer, jiffies+tv+2))
194                 atomic_inc(&im->refcnt);
195 }
196
197 static void igmp_gq_start_timer(struct in_device *in_dev)
198 {
199         int tv = net_random() % in_dev->mr_maxdelay;
200
201         in_dev->mr_gq_running = 1;
202         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
203                 in_dev_hold(in_dev);
204 }
205
206 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
207 {
208         int tv = net_random() % delay;
209
210         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
211                 in_dev_hold(in_dev);
212 }
213
214 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
215 {
216         spin_lock_bh(&im->lock);
217         im->unsolicit_count = 0;
218         if (del_timer(&im->timer)) {
219                 if ((long)(im->timer.expires-jiffies) < max_delay) {
220                         add_timer(&im->timer);
221                         im->tm_running = 1;
222                         spin_unlock_bh(&im->lock);
223                         return;
224                 }
225                 atomic_dec(&im->refcnt);
226         }
227         igmp_start_timer(im, max_delay);
228         spin_unlock_bh(&im->lock);
229 }
230
231
232 /*
233  *      Send an IGMP report.
234  */
235
236 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
237
238
239 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
240         int gdeleted, int sdeleted)
241 {
242         switch (type) {
243         case IGMPV3_MODE_IS_INCLUDE:
244         case IGMPV3_MODE_IS_EXCLUDE:
245                 if (gdeleted || sdeleted)
246                         return 0;
247                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
248                         if (pmc->sfmode == MCAST_INCLUDE)
249                                 return 1;
250                         /* don't include if this source is excluded
251                          * in all filters
252                          */
253                         if (psf->sf_count[MCAST_INCLUDE])
254                                 return type == IGMPV3_MODE_IS_INCLUDE;
255                         return pmc->sfcount[MCAST_EXCLUDE] ==
256                                 psf->sf_count[MCAST_EXCLUDE];
257                 }
258                 return 0;
259         case IGMPV3_CHANGE_TO_INCLUDE:
260                 if (gdeleted || sdeleted)
261                         return 0;
262                 return psf->sf_count[MCAST_INCLUDE] != 0;
263         case IGMPV3_CHANGE_TO_EXCLUDE:
264                 if (gdeleted || sdeleted)
265                         return 0;
266                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
267                     psf->sf_count[MCAST_INCLUDE])
268                         return 0;
269                 return pmc->sfcount[MCAST_EXCLUDE] ==
270                         psf->sf_count[MCAST_EXCLUDE];
271         case IGMPV3_ALLOW_NEW_SOURCES:
272                 if (gdeleted || !psf->sf_crcount)
273                         return 0;
274                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
275         case IGMPV3_BLOCK_OLD_SOURCES:
276                 if (pmc->sfmode == MCAST_INCLUDE)
277                         return gdeleted || (psf->sf_crcount && sdeleted);
278                 return psf->sf_crcount && !gdeleted && !sdeleted;
279         }
280         return 0;
281 }
282
283 static int
284 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
285 {
286         struct ip_sf_list *psf;
287         int scount = 0;
288
289         for (psf=pmc->sources; psf; psf=psf->sf_next) {
290                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
291                         continue;
292                 scount++;
293         }
294         return scount;
295 }
296
297 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
298
299 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
300 {
301         struct sk_buff *skb;
302         struct rtable *rt;
303         struct iphdr *pip;
304         struct igmpv3_report *pig;
305         struct net *net = dev_net(dev);
306         struct flowi4 fl4;
307
308         while (1) {
309                 skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev),
310                                 GFP_ATOMIC | __GFP_NOWARN);
311                 if (skb)
312                         break;
313                 size >>= 1;
314                 if (size < 256)
315                         return NULL;
316         }
317         igmp_skb_size(skb) = size;
318
319         rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
320                                    0, 0,
321                                    IPPROTO_IGMP, 0, dev->ifindex);
322         if (IS_ERR(rt)) {
323                 kfree_skb(skb);
324                 return NULL;
325         }
326
327         skb_dst_set(skb, &rt->dst);
328         skb->dev = dev;
329
330         skb_reserve(skb, LL_RESERVED_SPACE(dev));
331
332         skb_reset_network_header(skb);
333         pip = ip_hdr(skb);
334         skb_put(skb, sizeof(struct iphdr) + 4);
335
336         pip->version  = 4;
337         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
338         pip->tos      = 0xc0;
339         pip->frag_off = htons(IP_DF);
340         pip->ttl      = 1;
341         pip->daddr    = fl4.daddr;
342         pip->saddr    = fl4.saddr;
343         pip->protocol = IPPROTO_IGMP;
344         pip->tot_len  = 0;      /* filled in later */
345         ip_select_ident(pip, &rt->dst, NULL);
346         ((u8*)&pip[1])[0] = IPOPT_RA;
347         ((u8*)&pip[1])[1] = 4;
348         ((u8*)&pip[1])[2] = 0;
349         ((u8*)&pip[1])[3] = 0;
350
351         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
352         skb_put(skb, sizeof(*pig));
353         pig = igmpv3_report_hdr(skb);
354         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
355         pig->resv1 = 0;
356         pig->csum = 0;
357         pig->resv2 = 0;
358         pig->ngrec = 0;
359         return skb;
360 }
361
362 static int igmpv3_sendpack(struct sk_buff *skb)
363 {
364         struct igmphdr *pig = igmp_hdr(skb);
365         const int igmplen = skb->tail - skb->transport_header;
366
367         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
368
369         return ip_local_out(skb);
370 }
371
372 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
373 {
374         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
375 }
376
377 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
378         int type, struct igmpv3_grec **ppgr)
379 {
380         struct net_device *dev = pmc->interface->dev;
381         struct igmpv3_report *pih;
382         struct igmpv3_grec *pgr;
383
384         if (!skb)
385                 skb = igmpv3_newpack(dev, dev->mtu);
386         if (!skb)
387                 return NULL;
388         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
389         pgr->grec_type = type;
390         pgr->grec_auxwords = 0;
391         pgr->grec_nsrcs = 0;
392         pgr->grec_mca = pmc->multiaddr;
393         pih = igmpv3_report_hdr(skb);
394         pih->ngrec = htons(ntohs(pih->ngrec)+1);
395         *ppgr = pgr;
396         return skb;
397 }
398
399 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
400         skb_tailroom(skb)) : 0)
401
402 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
403         int type, int gdeleted, int sdeleted)
404 {
405         struct net_device *dev = pmc->interface->dev;
406         struct igmpv3_report *pih;
407         struct igmpv3_grec *pgr = NULL;
408         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
409         int scount, stotal, first, isquery, truncate;
410
411         if (pmc->multiaddr == IGMP_ALL_HOSTS)
412                 return skb;
413
414         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
415                   type == IGMPV3_MODE_IS_EXCLUDE;
416         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
417                     type == IGMPV3_CHANGE_TO_EXCLUDE;
418
419         stotal = scount = 0;
420
421         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
422
423         if (!*psf_list)
424                 goto empty_source;
425
426         pih = skb ? igmpv3_report_hdr(skb) : NULL;
427
428         /* EX and TO_EX get a fresh packet, if needed */
429         if (truncate) {
430                 if (pih && pih->ngrec &&
431                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
432                         if (skb)
433                                 igmpv3_sendpack(skb);
434                         skb = igmpv3_newpack(dev, dev->mtu);
435                 }
436         }
437         first = 1;
438         psf_prev = NULL;
439         for (psf=*psf_list; psf; psf=psf_next) {
440                 __be32 *psrc;
441
442                 psf_next = psf->sf_next;
443
444                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
445                         psf_prev = psf;
446                         continue;
447                 }
448
449                 /* clear marks on query responses */
450                 if (isquery)
451                         psf->sf_gsresp = 0;
452
453                 if (AVAILABLE(skb) < sizeof(__be32) +
454                     first*sizeof(struct igmpv3_grec)) {
455                         if (truncate && !first)
456                                 break;   /* truncate these */
457                         if (pgr)
458                                 pgr->grec_nsrcs = htons(scount);
459                         if (skb)
460                                 igmpv3_sendpack(skb);
461                         skb = igmpv3_newpack(dev, dev->mtu);
462                         first = 1;
463                         scount = 0;
464                 }
465                 if (first) {
466                         skb = add_grhead(skb, pmc, type, &pgr);
467                         first = 0;
468                 }
469                 if (!skb)
470                         return NULL;
471                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
472                 *psrc = psf->sf_inaddr;
473                 scount++; stotal++;
474                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
475                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
476                         psf->sf_crcount--;
477                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
478                                 if (psf_prev)
479                                         psf_prev->sf_next = psf->sf_next;
480                                 else
481                                         *psf_list = psf->sf_next;
482                                 kfree(psf);
483                                 continue;
484                         }
485                 }
486                 psf_prev = psf;
487         }
488
489 empty_source:
490         if (!stotal) {
491                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
492                     type == IGMPV3_BLOCK_OLD_SOURCES)
493                         return skb;
494                 if (pmc->crcount || isquery) {
495                         /* make sure we have room for group header */
496                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
497                                 igmpv3_sendpack(skb);
498                                 skb = NULL; /* add_grhead will get a new one */
499                         }
500                         skb = add_grhead(skb, pmc, type, &pgr);
501                 }
502         }
503         if (pgr)
504                 pgr->grec_nsrcs = htons(scount);
505
506         if (isquery)
507                 pmc->gsquery = 0;       /* clear query state on report */
508         return skb;
509 }
510
511 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
512 {
513         struct sk_buff *skb = NULL;
514         int type;
515
516         if (!pmc) {
517                 rcu_read_lock();
518                 for_each_pmc_rcu(in_dev, pmc) {
519                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
520                                 continue;
521                         spin_lock_bh(&pmc->lock);
522                         if (pmc->sfcount[MCAST_EXCLUDE])
523                                 type = IGMPV3_MODE_IS_EXCLUDE;
524                         else
525                                 type = IGMPV3_MODE_IS_INCLUDE;
526                         skb = add_grec(skb, pmc, type, 0, 0);
527                         spin_unlock_bh(&pmc->lock);
528                 }
529                 rcu_read_unlock();
530         } else {
531                 spin_lock_bh(&pmc->lock);
532                 if (pmc->sfcount[MCAST_EXCLUDE])
533                         type = IGMPV3_MODE_IS_EXCLUDE;
534                 else
535                         type = IGMPV3_MODE_IS_INCLUDE;
536                 skb = add_grec(skb, pmc, type, 0, 0);
537                 spin_unlock_bh(&pmc->lock);
538         }
539         if (!skb)
540                 return 0;
541         return igmpv3_sendpack(skb);
542 }
543
544 /*
545  * remove zero-count source records from a source filter list
546  */
547 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
548 {
549         struct ip_sf_list *psf_prev, *psf_next, *psf;
550
551         psf_prev = NULL;
552         for (psf=*ppsf; psf; psf = psf_next) {
553                 psf_next = psf->sf_next;
554                 if (psf->sf_crcount == 0) {
555                         if (psf_prev)
556                                 psf_prev->sf_next = psf->sf_next;
557                         else
558                                 *ppsf = psf->sf_next;
559                         kfree(psf);
560                 } else
561                         psf_prev = psf;
562         }
563 }
564
565 static void igmpv3_send_cr(struct in_device *in_dev)
566 {
567         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
568         struct sk_buff *skb = NULL;
569         int type, dtype;
570
571         rcu_read_lock();
572         spin_lock_bh(&in_dev->mc_tomb_lock);
573
574         /* deleted MCA's */
575         pmc_prev = NULL;
576         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
577                 pmc_next = pmc->next;
578                 if (pmc->sfmode == MCAST_INCLUDE) {
579                         type = IGMPV3_BLOCK_OLD_SOURCES;
580                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
581                         skb = add_grec(skb, pmc, type, 1, 0);
582                         skb = add_grec(skb, pmc, dtype, 1, 1);
583                 }
584                 if (pmc->crcount) {
585                         if (pmc->sfmode == MCAST_EXCLUDE) {
586                                 type = IGMPV3_CHANGE_TO_INCLUDE;
587                                 skb = add_grec(skb, pmc, type, 1, 0);
588                         }
589                         pmc->crcount--;
590                         if (pmc->crcount == 0) {
591                                 igmpv3_clear_zeros(&pmc->tomb);
592                                 igmpv3_clear_zeros(&pmc->sources);
593                         }
594                 }
595                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
596                         if (pmc_prev)
597                                 pmc_prev->next = pmc_next;
598                         else
599                                 in_dev->mc_tomb = pmc_next;
600                         in_dev_put(pmc->interface);
601                         kfree(pmc);
602                 } else
603                         pmc_prev = pmc;
604         }
605         spin_unlock_bh(&in_dev->mc_tomb_lock);
606
607         /* change recs */
608         for_each_pmc_rcu(in_dev, pmc) {
609                 spin_lock_bh(&pmc->lock);
610                 if (pmc->sfcount[MCAST_EXCLUDE]) {
611                         type = IGMPV3_BLOCK_OLD_SOURCES;
612                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
613                 } else {
614                         type = IGMPV3_ALLOW_NEW_SOURCES;
615                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
616                 }
617                 skb = add_grec(skb, pmc, type, 0, 0);
618                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
619
620                 /* filter mode changes */
621                 if (pmc->crcount) {
622                         if (pmc->sfmode == MCAST_EXCLUDE)
623                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
624                         else
625                                 type = IGMPV3_CHANGE_TO_INCLUDE;
626                         skb = add_grec(skb, pmc, type, 0, 0);
627                         pmc->crcount--;
628                 }
629                 spin_unlock_bh(&pmc->lock);
630         }
631         rcu_read_unlock();
632
633         if (!skb)
634                 return;
635         (void) igmpv3_sendpack(skb);
636 }
637
638 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
639         int type)
640 {
641         struct sk_buff *skb;
642         struct iphdr *iph;
643         struct igmphdr *ih;
644         struct rtable *rt;
645         struct net_device *dev = in_dev->dev;
646         struct net *net = dev_net(dev);
647         __be32  group = pmc ? pmc->multiaddr : 0;
648         struct flowi4 fl4;
649         __be32  dst;
650
651         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
652                 return igmpv3_send_report(in_dev, pmc);
653         else if (type == IGMP_HOST_LEAVE_MESSAGE)
654                 dst = IGMP_ALL_ROUTER;
655         else
656                 dst = group;
657
658         rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
659                                    0, 0,
660                                    IPPROTO_IGMP, 0, dev->ifindex);
661         if (IS_ERR(rt))
662                 return -1;
663
664         skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
665         if (skb == NULL) {
666                 ip_rt_put(rt);
667                 return -1;
668         }
669
670         skb_dst_set(skb, &rt->dst);
671
672         skb_reserve(skb, LL_RESERVED_SPACE(dev));
673
674         skb_reset_network_header(skb);
675         iph = ip_hdr(skb);
676         skb_put(skb, sizeof(struct iphdr) + 4);
677
678         iph->version  = 4;
679         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
680         iph->tos      = 0xc0;
681         iph->frag_off = htons(IP_DF);
682         iph->ttl      = 1;
683         iph->daddr    = dst;
684         iph->saddr    = fl4.saddr;
685         iph->protocol = IPPROTO_IGMP;
686         ip_select_ident(iph, &rt->dst, NULL);
687         ((u8*)&iph[1])[0] = IPOPT_RA;
688         ((u8*)&iph[1])[1] = 4;
689         ((u8*)&iph[1])[2] = 0;
690         ((u8*)&iph[1])[3] = 0;
691
692         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
693         ih->type = type;
694         ih->code = 0;
695         ih->csum = 0;
696         ih->group = group;
697         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
698
699         return ip_local_out(skb);
700 }
701
702 static void igmp_gq_timer_expire(unsigned long data)
703 {
704         struct in_device *in_dev = (struct in_device *)data;
705
706         in_dev->mr_gq_running = 0;
707         igmpv3_send_report(in_dev, NULL);
708         __in_dev_put(in_dev);
709 }
710
711 static void igmp_ifc_timer_expire(unsigned long data)
712 {
713         struct in_device *in_dev = (struct in_device *)data;
714
715         igmpv3_send_cr(in_dev);
716         if (in_dev->mr_ifc_count) {
717                 in_dev->mr_ifc_count--;
718                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
719         }
720         __in_dev_put(in_dev);
721 }
722
723 static void igmp_ifc_event(struct in_device *in_dev)
724 {
725         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
726                 return;
727         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
728                 IGMP_Unsolicited_Report_Count;
729         igmp_ifc_start_timer(in_dev, 1);
730 }
731
732
733 static void igmp_timer_expire(unsigned long data)
734 {
735         struct ip_mc_list *im=(struct ip_mc_list *)data;
736         struct in_device *in_dev = im->interface;
737
738         spin_lock(&im->lock);
739         im->tm_running = 0;
740
741         if (im->unsolicit_count) {
742                 im->unsolicit_count--;
743                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
744         }
745         im->reporter = 1;
746         spin_unlock(&im->lock);
747
748         if (IGMP_V1_SEEN(in_dev))
749                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
750         else if (IGMP_V2_SEEN(in_dev))
751                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
752         else
753                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
754
755         ip_ma_put(im);
756 }
757
758 /* mark EXCLUDE-mode sources */
759 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
760 {
761         struct ip_sf_list *psf;
762         int i, scount;
763
764         scount = 0;
765         for (psf=pmc->sources; psf; psf=psf->sf_next) {
766                 if (scount == nsrcs)
767                         break;
768                 for (i=0; i<nsrcs; i++) {
769                         /* skip inactive filters */
770                         if (psf->sf_count[MCAST_INCLUDE] ||
771                             pmc->sfcount[MCAST_EXCLUDE] !=
772                             psf->sf_count[MCAST_EXCLUDE])
773                                 continue;
774                         if (srcs[i] == psf->sf_inaddr) {
775                                 scount++;
776                                 break;
777                         }
778                 }
779         }
780         pmc->gsquery = 0;
781         if (scount == nsrcs)    /* all sources excluded */
782                 return 0;
783         return 1;
784 }
785
786 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
787 {
788         struct ip_sf_list *psf;
789         int i, scount;
790
791         if (pmc->sfmode == MCAST_EXCLUDE)
792                 return igmp_xmarksources(pmc, nsrcs, srcs);
793
794         /* mark INCLUDE-mode sources */
795         scount = 0;
796         for (psf=pmc->sources; psf; psf=psf->sf_next) {
797                 if (scount == nsrcs)
798                         break;
799                 for (i=0; i<nsrcs; i++)
800                         if (srcs[i] == psf->sf_inaddr) {
801                                 psf->sf_gsresp = 1;
802                                 scount++;
803                                 break;
804                         }
805         }
806         if (!scount) {
807                 pmc->gsquery = 0;
808                 return 0;
809         }
810         pmc->gsquery = 1;
811         return 1;
812 }
813
814 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
815 {
816         struct ip_mc_list *im;
817
818         /* Timers are only set for non-local groups */
819
820         if (group == IGMP_ALL_HOSTS)
821                 return;
822
823         rcu_read_lock();
824         for_each_pmc_rcu(in_dev, im) {
825                 if (im->multiaddr == group) {
826                         igmp_stop_timer(im);
827                         break;
828                 }
829         }
830         rcu_read_unlock();
831 }
832
833 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
834         int len)
835 {
836         struct igmphdr          *ih = igmp_hdr(skb);
837         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
838         struct ip_mc_list       *im;
839         __be32                  group = ih->group;
840         int                     max_delay;
841         int                     mark = 0;
842
843
844         if (len == 8) {
845                 if (ih->code == 0) {
846                         /* Alas, old v1 router presents here. */
847
848                         max_delay = IGMP_Query_Response_Interval;
849                         in_dev->mr_v1_seen = jiffies +
850                                 IGMP_V1_Router_Present_Timeout;
851                         group = 0;
852                 } else {
853                         /* v2 router present */
854                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
855                         in_dev->mr_v2_seen = jiffies +
856                                 IGMP_V2_Router_Present_Timeout;
857                 }
858                 /* cancel the interface change timer */
859                 in_dev->mr_ifc_count = 0;
860                 if (del_timer(&in_dev->mr_ifc_timer))
861                         __in_dev_put(in_dev);
862                 /* clear deleted report items */
863                 igmpv3_clear_delrec(in_dev);
864         } else if (len < 12) {
865                 return; /* ignore bogus packet; freed by caller */
866         } else if (IGMP_V1_SEEN(in_dev)) {
867                 /* This is a v3 query with v1 queriers present */
868                 max_delay = IGMP_Query_Response_Interval;
869                 group = 0;
870         } else if (IGMP_V2_SEEN(in_dev)) {
871                 /* this is a v3 query with v2 queriers present;
872                  * Interpretation of the max_delay code is problematic here.
873                  * A real v2 host would use ih_code directly, while v3 has a
874                  * different encoding. We use the v3 encoding as more likely
875                  * to be intended in a v3 query.
876                  */
877                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
878         } else { /* v3 */
879                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
880                         return;
881
882                 ih3 = igmpv3_query_hdr(skb);
883                 if (ih3->nsrcs) {
884                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
885                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
886                                 return;
887                         ih3 = igmpv3_query_hdr(skb);
888                 }
889
890                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
891                 if (!max_delay)
892                         max_delay = 1;  /* can't mod w/ 0 */
893                 in_dev->mr_maxdelay = max_delay;
894                 if (ih3->qrv)
895                         in_dev->mr_qrv = ih3->qrv;
896                 if (!group) { /* general query */
897                         if (ih3->nsrcs)
898                                 return; /* no sources allowed */
899                         igmp_gq_start_timer(in_dev);
900                         return;
901                 }
902                 /* mark sources to include, if group & source-specific */
903                 mark = ih3->nsrcs != 0;
904         }
905
906         /*
907          * - Start the timers in all of our membership records
908          *   that the query applies to for the interface on
909          *   which the query arrived excl. those that belong
910          *   to a "local" group (224.0.0.X)
911          * - For timers already running check if they need to
912          *   be reset.
913          * - Use the igmp->igmp_code field as the maximum
914          *   delay possible
915          */
916         rcu_read_lock();
917         for_each_pmc_rcu(in_dev, im) {
918                 int changed;
919
920                 if (group && group != im->multiaddr)
921                         continue;
922                 if (im->multiaddr == IGMP_ALL_HOSTS)
923                         continue;
924                 spin_lock_bh(&im->lock);
925                 if (im->tm_running)
926                         im->gsquery = im->gsquery && mark;
927                 else
928                         im->gsquery = mark;
929                 changed = !im->gsquery ||
930                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
931                 spin_unlock_bh(&im->lock);
932                 if (changed)
933                         igmp_mod_timer(im, max_delay);
934         }
935         rcu_read_unlock();
936 }
937
938 /* called in rcu_read_lock() section */
939 int igmp_rcv(struct sk_buff *skb)
940 {
941         /* This basically follows the spec line by line -- see RFC1112 */
942         struct igmphdr *ih;
943         struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
944         int len = skb->len;
945
946         if (in_dev == NULL)
947                 goto drop;
948
949         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
950                 goto drop;
951
952         switch (skb->ip_summed) {
953         case CHECKSUM_COMPLETE:
954                 if (!csum_fold(skb->csum))
955                         break;
956                 /* fall through */
957         case CHECKSUM_NONE:
958                 skb->csum = 0;
959                 if (__skb_checksum_complete(skb))
960                         goto drop;
961         }
962
963         ih = igmp_hdr(skb);
964         switch (ih->type) {
965         case IGMP_HOST_MEMBERSHIP_QUERY:
966                 igmp_heard_query(in_dev, skb, len);
967                 break;
968         case IGMP_HOST_MEMBERSHIP_REPORT:
969         case IGMPV2_HOST_MEMBERSHIP_REPORT:
970                 /* Is it our report looped back? */
971                 if (rt_is_output_route(skb_rtable(skb)))
972                         break;
973                 /* don't rely on MC router hearing unicast reports */
974                 if (skb->pkt_type == PACKET_MULTICAST ||
975                     skb->pkt_type == PACKET_BROADCAST)
976                         igmp_heard_report(in_dev, ih->group);
977                 break;
978         case IGMP_PIM:
979 #ifdef CONFIG_IP_PIMSM_V1
980                 return pim_rcv_v1(skb);
981 #endif
982         case IGMPV3_HOST_MEMBERSHIP_REPORT:
983         case IGMP_DVMRP:
984         case IGMP_TRACE:
985         case IGMP_HOST_LEAVE_MESSAGE:
986         case IGMP_MTRACE:
987         case IGMP_MTRACE_RESP:
988                 break;
989         default:
990                 break;
991         }
992
993 drop:
994         kfree_skb(skb);
995         return 0;
996 }
997
998 #endif
999
1000
1001 /*
1002  *      Add a filter to a device
1003  */
1004
1005 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1006 {
1007         char buf[MAX_ADDR_LEN];
1008         struct net_device *dev = in_dev->dev;
1009
1010         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1011            We will get multicast token leakage, when IFF_MULTICAST
1012            is changed. This check should be done in dev->set_multicast_list
1013            routine. Something sort of:
1014            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1015            --ANK
1016            */
1017         if (arp_mc_map(addr, buf, dev, 0) == 0)
1018                 dev_mc_add(dev, buf);
1019 }
1020
1021 /*
1022  *      Remove a filter from a device
1023  */
1024
1025 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1026 {
1027         char buf[MAX_ADDR_LEN];
1028         struct net_device *dev = in_dev->dev;
1029
1030         if (arp_mc_map(addr, buf, dev, 0) == 0)
1031                 dev_mc_del(dev, buf);
1032 }
1033
1034 #ifdef CONFIG_IP_MULTICAST
1035 /*
1036  * deleted ip_mc_list manipulation
1037  */
1038 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1039 {
1040         struct ip_mc_list *pmc;
1041
1042         /* this is an "ip_mc_list" for convenience; only the fields below
1043          * are actually used. In particular, the refcnt and users are not
1044          * used for management of the delete list. Using the same structure
1045          * for deleted items allows change reports to use common code with
1046          * non-deleted or query-response MCA's.
1047          */
1048         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1049         if (!pmc)
1050                 return;
1051         spin_lock_bh(&im->lock);
1052         pmc->interface = im->interface;
1053         in_dev_hold(in_dev);
1054         pmc->multiaddr = im->multiaddr;
1055         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1056                 IGMP_Unsolicited_Report_Count;
1057         pmc->sfmode = im->sfmode;
1058         if (pmc->sfmode == MCAST_INCLUDE) {
1059                 struct ip_sf_list *psf;
1060
1061                 pmc->tomb = im->tomb;
1062                 pmc->sources = im->sources;
1063                 im->tomb = im->sources = NULL;
1064                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1065                         psf->sf_crcount = pmc->crcount;
1066         }
1067         spin_unlock_bh(&im->lock);
1068
1069         spin_lock_bh(&in_dev->mc_tomb_lock);
1070         pmc->next = in_dev->mc_tomb;
1071         in_dev->mc_tomb = pmc;
1072         spin_unlock_bh(&in_dev->mc_tomb_lock);
1073 }
1074
1075 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1076 {
1077         struct ip_mc_list *pmc, *pmc_prev;
1078         struct ip_sf_list *psf, *psf_next;
1079
1080         spin_lock_bh(&in_dev->mc_tomb_lock);
1081         pmc_prev = NULL;
1082         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1083                 if (pmc->multiaddr == multiaddr)
1084                         break;
1085                 pmc_prev = pmc;
1086         }
1087         if (pmc) {
1088                 if (pmc_prev)
1089                         pmc_prev->next = pmc->next;
1090                 else
1091                         in_dev->mc_tomb = pmc->next;
1092         }
1093         spin_unlock_bh(&in_dev->mc_tomb_lock);
1094         if (pmc) {
1095                 for (psf=pmc->tomb; psf; psf=psf_next) {
1096                         psf_next = psf->sf_next;
1097                         kfree(psf);
1098                 }
1099                 in_dev_put(pmc->interface);
1100                 kfree(pmc);
1101         }
1102 }
1103
1104 static void igmpv3_clear_delrec(struct in_device *in_dev)
1105 {
1106         struct ip_mc_list *pmc, *nextpmc;
1107
1108         spin_lock_bh(&in_dev->mc_tomb_lock);
1109         pmc = in_dev->mc_tomb;
1110         in_dev->mc_tomb = NULL;
1111         spin_unlock_bh(&in_dev->mc_tomb_lock);
1112
1113         for (; pmc; pmc = nextpmc) {
1114                 nextpmc = pmc->next;
1115                 ip_mc_clear_src(pmc);
1116                 in_dev_put(pmc->interface);
1117                 kfree(pmc);
1118         }
1119         /* clear dead sources, too */
1120         rcu_read_lock();
1121         for_each_pmc_rcu(in_dev, pmc) {
1122                 struct ip_sf_list *psf, *psf_next;
1123
1124                 spin_lock_bh(&pmc->lock);
1125                 psf = pmc->tomb;
1126                 pmc->tomb = NULL;
1127                 spin_unlock_bh(&pmc->lock);
1128                 for (; psf; psf=psf_next) {
1129                         psf_next = psf->sf_next;
1130                         kfree(psf);
1131                 }
1132         }
1133         rcu_read_unlock();
1134 }
1135 #endif
1136
1137 static void igmp_group_dropped(struct ip_mc_list *im)
1138 {
1139         struct in_device *in_dev = im->interface;
1140 #ifdef CONFIG_IP_MULTICAST
1141         int reporter;
1142 #endif
1143
1144         if (im->loaded) {
1145                 im->loaded = 0;
1146                 ip_mc_filter_del(in_dev, im->multiaddr);
1147         }
1148
1149 #ifdef CONFIG_IP_MULTICAST
1150         if (im->multiaddr == IGMP_ALL_HOSTS)
1151                 return;
1152
1153         reporter = im->reporter;
1154         igmp_stop_timer(im);
1155
1156         if (!in_dev->dead) {
1157                 if (IGMP_V1_SEEN(in_dev))
1158                         return;
1159                 if (IGMP_V2_SEEN(in_dev)) {
1160                         if (reporter)
1161                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1162                         return;
1163                 }
1164                 /* IGMPv3 */
1165                 igmpv3_add_delrec(in_dev, im);
1166
1167                 igmp_ifc_event(in_dev);
1168         }
1169 #endif
1170 }
1171
1172 static void igmp_group_added(struct ip_mc_list *im)
1173 {
1174         struct in_device *in_dev = im->interface;
1175
1176         if (im->loaded == 0) {
1177                 im->loaded = 1;
1178                 ip_mc_filter_add(in_dev, im->multiaddr);
1179         }
1180
1181 #ifdef CONFIG_IP_MULTICAST
1182         if (im->multiaddr == IGMP_ALL_HOSTS)
1183                 return;
1184
1185         if (in_dev->dead)
1186                 return;
1187         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1188                 spin_lock_bh(&im->lock);
1189                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1190                 spin_unlock_bh(&im->lock);
1191                 return;
1192         }
1193         /* else, v3 */
1194
1195         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1196                 IGMP_Unsolicited_Report_Count;
1197         igmp_ifc_event(in_dev);
1198 #endif
1199 }
1200
1201
1202 /*
1203  *      Multicast list managers
1204  */
1205
1206
1207 /*
1208  *      A socket has joined a multicast group on device dev.
1209  */
1210
1211 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1212 {
1213         struct ip_mc_list *im;
1214
1215         ASSERT_RTNL();
1216
1217         for_each_pmc_rtnl(in_dev, im) {
1218                 if (im->multiaddr == addr) {
1219                         im->users++;
1220                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1221                         goto out;
1222                 }
1223         }
1224
1225         im = kzalloc(sizeof(*im), GFP_KERNEL);
1226         if (!im)
1227                 goto out;
1228
1229         im->users = 1;
1230         im->interface = in_dev;
1231         in_dev_hold(in_dev);
1232         im->multiaddr = addr;
1233         /* initial mode is (EX, empty) */
1234         im->sfmode = MCAST_EXCLUDE;
1235         im->sfcount[MCAST_EXCLUDE] = 1;
1236         atomic_set(&im->refcnt, 1);
1237         spin_lock_init(&im->lock);
1238 #ifdef CONFIG_IP_MULTICAST
1239         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1240         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1241 #endif
1242
1243         im->next_rcu = in_dev->mc_list;
1244         in_dev->mc_count++;
1245         rcu_assign_pointer(in_dev->mc_list, im);
1246
1247 #ifdef CONFIG_IP_MULTICAST
1248         igmpv3_del_delrec(in_dev, im->multiaddr);
1249 #endif
1250         igmp_group_added(im);
1251         if (!in_dev->dead)
1252                 ip_rt_multicast_event(in_dev);
1253 out:
1254         return;
1255 }
1256 EXPORT_SYMBOL(ip_mc_inc_group);
1257
1258 /*
1259  *      Resend IGMP JOIN report; used for bonding.
1260  *      Called with rcu_read_lock()
1261  */
1262 void ip_mc_rejoin_groups(struct in_device *in_dev)
1263 {
1264 #ifdef CONFIG_IP_MULTICAST
1265         struct ip_mc_list *im;
1266         int type;
1267
1268         for_each_pmc_rcu(in_dev, im) {
1269                 if (im->multiaddr == IGMP_ALL_HOSTS)
1270                         continue;
1271
1272                 /* a failover is happening and switches
1273                  * must be notified immediately
1274                  */
1275                 if (IGMP_V1_SEEN(in_dev))
1276                         type = IGMP_HOST_MEMBERSHIP_REPORT;
1277                 else if (IGMP_V2_SEEN(in_dev))
1278                         type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1279                 else
1280                         type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1281                 igmp_send_report(in_dev, im, type);
1282         }
1283 #endif
1284 }
1285 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1286
1287 /*
1288  *      A socket has left a multicast group on device dev
1289  */
1290
1291 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1292 {
1293         struct ip_mc_list *i;
1294         struct ip_mc_list __rcu **ip;
1295
1296         ASSERT_RTNL();
1297
1298         for (ip = &in_dev->mc_list;
1299              (i = rtnl_dereference(*ip)) != NULL;
1300              ip = &i->next_rcu) {
1301                 if (i->multiaddr == addr) {
1302                         if (--i->users == 0) {
1303                                 *ip = i->next_rcu;
1304                                 in_dev->mc_count--;
1305                                 igmp_group_dropped(i);
1306                                 ip_mc_clear_src(i);
1307
1308                                 if (!in_dev->dead)
1309                                         ip_rt_multicast_event(in_dev);
1310
1311                                 ip_ma_put(i);
1312                                 return;
1313                         }
1314                         break;
1315                 }
1316         }
1317 }
1318 EXPORT_SYMBOL(ip_mc_dec_group);
1319
1320 /* Device changing type */
1321
1322 void ip_mc_unmap(struct in_device *in_dev)
1323 {
1324         struct ip_mc_list *pmc;
1325
1326         ASSERT_RTNL();
1327
1328         for_each_pmc_rtnl(in_dev, pmc)
1329                 igmp_group_dropped(pmc);
1330 }
1331
1332 void ip_mc_remap(struct in_device *in_dev)
1333 {
1334         struct ip_mc_list *pmc;
1335
1336         ASSERT_RTNL();
1337
1338         for_each_pmc_rtnl(in_dev, pmc)
1339                 igmp_group_added(pmc);
1340 }
1341
1342 /* Device going down */
1343
1344 void ip_mc_down(struct in_device *in_dev)
1345 {
1346         struct ip_mc_list *pmc;
1347
1348         ASSERT_RTNL();
1349
1350         for_each_pmc_rtnl(in_dev, pmc)
1351                 igmp_group_dropped(pmc);
1352
1353 #ifdef CONFIG_IP_MULTICAST
1354         in_dev->mr_ifc_count = 0;
1355         if (del_timer(&in_dev->mr_ifc_timer))
1356                 __in_dev_put(in_dev);
1357         in_dev->mr_gq_running = 0;
1358         if (del_timer(&in_dev->mr_gq_timer))
1359                 __in_dev_put(in_dev);
1360         igmpv3_clear_delrec(in_dev);
1361 #endif
1362
1363         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1364 }
1365
1366 void ip_mc_init_dev(struct in_device *in_dev)
1367 {
1368         ASSERT_RTNL();
1369
1370         in_dev->mc_tomb = NULL;
1371 #ifdef CONFIG_IP_MULTICAST
1372         in_dev->mr_gq_running = 0;
1373         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1374                         (unsigned long)in_dev);
1375         in_dev->mr_ifc_count = 0;
1376         in_dev->mc_count     = 0;
1377         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1378                         (unsigned long)in_dev);
1379         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1380 #endif
1381
1382         spin_lock_init(&in_dev->mc_tomb_lock);
1383 }
1384
1385 /* Device going up */
1386
1387 void ip_mc_up(struct in_device *in_dev)
1388 {
1389         struct ip_mc_list *pmc;
1390
1391         ASSERT_RTNL();
1392
1393         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1394
1395         for_each_pmc_rtnl(in_dev, pmc)
1396                 igmp_group_added(pmc);
1397 }
1398
1399 /*
1400  *      Device is about to be destroyed: clean up.
1401  */
1402
1403 void ip_mc_destroy_dev(struct in_device *in_dev)
1404 {
1405         struct ip_mc_list *i;
1406
1407         ASSERT_RTNL();
1408
1409         /* Deactivate timers */
1410         ip_mc_down(in_dev);
1411
1412         while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1413                 in_dev->mc_list = i->next_rcu;
1414                 in_dev->mc_count--;
1415
1416                 /* We've dropped the groups in ip_mc_down already */
1417                 ip_mc_clear_src(i);
1418                 ip_ma_put(i);
1419         }
1420 }
1421
1422 /* RTNL is locked */
1423 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1424 {
1425         struct net_device *dev = NULL;
1426         struct in_device *idev = NULL;
1427
1428         if (imr->imr_ifindex) {
1429                 idev = inetdev_by_index(net, imr->imr_ifindex);
1430                 return idev;
1431         }
1432         if (imr->imr_address.s_addr) {
1433                 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1434                 if (!dev)
1435                         return NULL;
1436         }
1437
1438         if (!dev) {
1439                 struct rtable *rt = ip_route_output(net,
1440                                                     imr->imr_multiaddr.s_addr,
1441                                                     0, 0, 0);
1442                 if (!IS_ERR(rt)) {
1443                         dev = rt->dst.dev;
1444                         ip_rt_put(rt);
1445                 }
1446         }
1447         if (dev) {
1448                 imr->imr_ifindex = dev->ifindex;
1449                 idev = __in_dev_get_rtnl(dev);
1450         }
1451         return idev;
1452 }
1453
1454 /*
1455  *      Join a socket to a group
1456  */
1457 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1458 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1459
1460
1461 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1462         __be32 *psfsrc)
1463 {
1464         struct ip_sf_list *psf, *psf_prev;
1465         int rv = 0;
1466
1467         psf_prev = NULL;
1468         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1469                 if (psf->sf_inaddr == *psfsrc)
1470                         break;
1471                 psf_prev = psf;
1472         }
1473         if (!psf || psf->sf_count[sfmode] == 0) {
1474                 /* source filter not found, or count wrong =>  bug */
1475                 return -ESRCH;
1476         }
1477         psf->sf_count[sfmode]--;
1478         if (psf->sf_count[sfmode] == 0) {
1479                 ip_rt_multicast_event(pmc->interface);
1480         }
1481         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1482 #ifdef CONFIG_IP_MULTICAST
1483                 struct in_device *in_dev = pmc->interface;
1484 #endif
1485
1486                 /* no more filters for this source */
1487                 if (psf_prev)
1488                         psf_prev->sf_next = psf->sf_next;
1489                 else
1490                         pmc->sources = psf->sf_next;
1491 #ifdef CONFIG_IP_MULTICAST
1492                 if (psf->sf_oldin &&
1493                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1494                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1495                                 IGMP_Unsolicited_Report_Count;
1496                         psf->sf_next = pmc->tomb;
1497                         pmc->tomb = psf;
1498                         rv = 1;
1499                 } else
1500 #endif
1501                         kfree(psf);
1502         }
1503         return rv;
1504 }
1505
1506 #ifndef CONFIG_IP_MULTICAST
1507 #define igmp_ifc_event(x)       do { } while (0)
1508 #endif
1509
1510 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1511                          int sfcount, __be32 *psfsrc, int delta)
1512 {
1513         struct ip_mc_list *pmc;
1514         int     changerec = 0;
1515         int     i, err;
1516
1517         if (!in_dev)
1518                 return -ENODEV;
1519         rcu_read_lock();
1520         for_each_pmc_rcu(in_dev, pmc) {
1521                 if (*pmca == pmc->multiaddr)
1522                         break;
1523         }
1524         if (!pmc) {
1525                 /* MCA not found?? bug */
1526                 rcu_read_unlock();
1527                 return -ESRCH;
1528         }
1529         spin_lock_bh(&pmc->lock);
1530         rcu_read_unlock();
1531 #ifdef CONFIG_IP_MULTICAST
1532         sf_markstate(pmc);
1533 #endif
1534         if (!delta) {
1535                 err = -EINVAL;
1536                 if (!pmc->sfcount[sfmode])
1537                         goto out_unlock;
1538                 pmc->sfcount[sfmode]--;
1539         }
1540         err = 0;
1541         for (i=0; i<sfcount; i++) {
1542                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1543
1544                 changerec |= rv > 0;
1545                 if (!err && rv < 0)
1546                         err = rv;
1547         }
1548         if (pmc->sfmode == MCAST_EXCLUDE &&
1549             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1550             pmc->sfcount[MCAST_INCLUDE]) {
1551 #ifdef CONFIG_IP_MULTICAST
1552                 struct ip_sf_list *psf;
1553 #endif
1554
1555                 /* filter mode change */
1556                 pmc->sfmode = MCAST_INCLUDE;
1557 #ifdef CONFIG_IP_MULTICAST
1558                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1559                         IGMP_Unsolicited_Report_Count;
1560                 in_dev->mr_ifc_count = pmc->crcount;
1561                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1562                         psf->sf_crcount = 0;
1563                 igmp_ifc_event(pmc->interface);
1564         } else if (sf_setstate(pmc) || changerec) {
1565                 igmp_ifc_event(pmc->interface);
1566 #endif
1567         }
1568 out_unlock:
1569         spin_unlock_bh(&pmc->lock);
1570         return err;
1571 }
1572
1573 /*
1574  * Add multicast single-source filter to the interface list
1575  */
1576 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1577         __be32 *psfsrc, int delta)
1578 {
1579         struct ip_sf_list *psf, *psf_prev;
1580
1581         psf_prev = NULL;
1582         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1583                 if (psf->sf_inaddr == *psfsrc)
1584                         break;
1585                 psf_prev = psf;
1586         }
1587         if (!psf) {
1588                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1589                 if (!psf)
1590                         return -ENOBUFS;
1591                 psf->sf_inaddr = *psfsrc;
1592                 if (psf_prev) {
1593                         psf_prev->sf_next = psf;
1594                 } else
1595                         pmc->sources = psf;
1596         }
1597         psf->sf_count[sfmode]++;
1598         if (psf->sf_count[sfmode] == 1) {
1599                 ip_rt_multicast_event(pmc->interface);
1600         }
1601         return 0;
1602 }
1603
1604 #ifdef CONFIG_IP_MULTICAST
1605 static void sf_markstate(struct ip_mc_list *pmc)
1606 {
1607         struct ip_sf_list *psf;
1608         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1609
1610         for (psf=pmc->sources; psf; psf=psf->sf_next)
1611                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1612                         psf->sf_oldin = mca_xcount ==
1613                                 psf->sf_count[MCAST_EXCLUDE] &&
1614                                 !psf->sf_count[MCAST_INCLUDE];
1615                 } else
1616                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1617 }
1618
1619 static int sf_setstate(struct ip_mc_list *pmc)
1620 {
1621         struct ip_sf_list *psf, *dpsf;
1622         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1623         int qrv = pmc->interface->mr_qrv;
1624         int new_in, rv;
1625
1626         rv = 0;
1627         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1628                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1629                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1630                                 !psf->sf_count[MCAST_INCLUDE];
1631                 } else
1632                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1633                 if (new_in) {
1634                         if (!psf->sf_oldin) {
1635                                 struct ip_sf_list *prev = NULL;
1636
1637                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1638                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1639                                                 break;
1640                                         prev = dpsf;
1641                                 }
1642                                 if (dpsf) {
1643                                         if (prev)
1644                                                 prev->sf_next = dpsf->sf_next;
1645                                         else
1646                                                 pmc->tomb = dpsf->sf_next;
1647                                         kfree(dpsf);
1648                                 }
1649                                 psf->sf_crcount = qrv;
1650                                 rv++;
1651                         }
1652                 } else if (psf->sf_oldin) {
1653
1654                         psf->sf_crcount = 0;
1655                         /*
1656                          * add or update "delete" records if an active filter
1657                          * is now inactive
1658                          */
1659                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1660                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1661                                         break;
1662                         if (!dpsf) {
1663                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1664                                 if (!dpsf)
1665                                         continue;
1666                                 *dpsf = *psf;
1667                                 /* pmc->lock held by callers */
1668                                 dpsf->sf_next = pmc->tomb;
1669                                 pmc->tomb = dpsf;
1670                         }
1671                         dpsf->sf_crcount = qrv;
1672                         rv++;
1673                 }
1674         }
1675         return rv;
1676 }
1677 #endif
1678
1679 /*
1680  * Add multicast source filter list to the interface list
1681  */
1682 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1683                          int sfcount, __be32 *psfsrc, int delta)
1684 {
1685         struct ip_mc_list *pmc;
1686         int     isexclude;
1687         int     i, err;
1688
1689         if (!in_dev)
1690                 return -ENODEV;
1691         rcu_read_lock();
1692         for_each_pmc_rcu(in_dev, pmc) {
1693                 if (*pmca == pmc->multiaddr)
1694                         break;
1695         }
1696         if (!pmc) {
1697                 /* MCA not found?? bug */
1698                 rcu_read_unlock();
1699                 return -ESRCH;
1700         }
1701         spin_lock_bh(&pmc->lock);
1702         rcu_read_unlock();
1703
1704 #ifdef CONFIG_IP_MULTICAST
1705         sf_markstate(pmc);
1706 #endif
1707         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1708         if (!delta)
1709                 pmc->sfcount[sfmode]++;
1710         err = 0;
1711         for (i=0; i<sfcount; i++) {
1712                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1713                 if (err)
1714                         break;
1715         }
1716         if (err) {
1717                 int j;
1718
1719                 pmc->sfcount[sfmode]--;
1720                 for (j=0; j<i; j++)
1721                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1722         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1723 #ifdef CONFIG_IP_MULTICAST
1724                 struct ip_sf_list *psf;
1725                 in_dev = pmc->interface;
1726 #endif
1727
1728                 /* filter mode change */
1729                 if (pmc->sfcount[MCAST_EXCLUDE])
1730                         pmc->sfmode = MCAST_EXCLUDE;
1731                 else if (pmc->sfcount[MCAST_INCLUDE])
1732                         pmc->sfmode = MCAST_INCLUDE;
1733 #ifdef CONFIG_IP_MULTICAST
1734                 /* else no filters; keep old mode for reports */
1735
1736                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1737                         IGMP_Unsolicited_Report_Count;
1738                 in_dev->mr_ifc_count = pmc->crcount;
1739                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1740                         psf->sf_crcount = 0;
1741                 igmp_ifc_event(in_dev);
1742         } else if (sf_setstate(pmc)) {
1743                 igmp_ifc_event(in_dev);
1744 #endif
1745         }
1746         spin_unlock_bh(&pmc->lock);
1747         return err;
1748 }
1749
1750 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1751 {
1752         struct ip_sf_list *psf, *nextpsf;
1753
1754         for (psf=pmc->tomb; psf; psf=nextpsf) {
1755                 nextpsf = psf->sf_next;
1756                 kfree(psf);
1757         }
1758         pmc->tomb = NULL;
1759         for (psf=pmc->sources; psf; psf=nextpsf) {
1760                 nextpsf = psf->sf_next;
1761                 kfree(psf);
1762         }
1763         pmc->sources = NULL;
1764         pmc->sfmode = MCAST_EXCLUDE;
1765         pmc->sfcount[MCAST_INCLUDE] = 0;
1766         pmc->sfcount[MCAST_EXCLUDE] = 1;
1767 }
1768
1769
1770 /*
1771  * Join a multicast group
1772  */
1773 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1774 {
1775         int err;
1776         __be32 addr = imr->imr_multiaddr.s_addr;
1777         struct ip_mc_socklist *iml = NULL, *i;
1778         struct in_device *in_dev;
1779         struct inet_sock *inet = inet_sk(sk);
1780         struct net *net = sock_net(sk);
1781         int ifindex;
1782         int count = 0;
1783
1784         if (!ipv4_is_multicast(addr))
1785                 return -EINVAL;
1786
1787         rtnl_lock();
1788
1789         in_dev = ip_mc_find_dev(net, imr);
1790
1791         if (!in_dev) {
1792                 iml = NULL;
1793                 err = -ENODEV;
1794                 goto done;
1795         }
1796
1797         err = -EADDRINUSE;
1798         ifindex = imr->imr_ifindex;
1799         for_each_pmc_rtnl(inet, i) {
1800                 if (i->multi.imr_multiaddr.s_addr == addr &&
1801                     i->multi.imr_ifindex == ifindex)
1802                         goto done;
1803                 count++;
1804         }
1805         err = -ENOBUFS;
1806         if (count >= sysctl_igmp_max_memberships)
1807                 goto done;
1808         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1809         if (iml == NULL)
1810                 goto done;
1811
1812         memcpy(&iml->multi, imr, sizeof(*imr));
1813         iml->next_rcu = inet->mc_list;
1814         iml->sflist = NULL;
1815         iml->sfmode = MCAST_EXCLUDE;
1816         rcu_assign_pointer(inet->mc_list, iml);
1817         ip_mc_inc_group(in_dev, addr);
1818         err = 0;
1819 done:
1820         rtnl_unlock();
1821         return err;
1822 }
1823 EXPORT_SYMBOL(ip_mc_join_group);
1824
1825 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1826                            struct in_device *in_dev)
1827 {
1828         struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1829         int err;
1830
1831         if (psf == NULL) {
1832                 /* any-source empty exclude case */
1833                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1834                         iml->sfmode, 0, NULL, 0);
1835         }
1836         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1837                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1838         rcu_assign_pointer(iml->sflist, NULL);
1839         /* decrease mem now to avoid the memleak warning */
1840         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1841         kfree_rcu(psf, rcu);
1842         return err;
1843 }
1844
1845 /*
1846  *      Ask a socket to leave a group.
1847  */
1848
1849 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1850 {
1851         struct inet_sock *inet = inet_sk(sk);
1852         struct ip_mc_socklist *iml;
1853         struct ip_mc_socklist __rcu **imlp;
1854         struct in_device *in_dev;
1855         struct net *net = sock_net(sk);
1856         __be32 group = imr->imr_multiaddr.s_addr;
1857         u32 ifindex;
1858         int ret = -EADDRNOTAVAIL;
1859
1860         rtnl_lock();
1861         in_dev = ip_mc_find_dev(net, imr);
1862         ifindex = imr->imr_ifindex;
1863         for (imlp = &inet->mc_list;
1864              (iml = rtnl_dereference(*imlp)) != NULL;
1865              imlp = &iml->next_rcu) {
1866                 if (iml->multi.imr_multiaddr.s_addr != group)
1867                         continue;
1868                 if (ifindex) {
1869                         if (iml->multi.imr_ifindex != ifindex)
1870                                 continue;
1871                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1872                                 iml->multi.imr_address.s_addr)
1873                         continue;
1874
1875                 (void) ip_mc_leave_src(sk, iml, in_dev);
1876
1877                 *imlp = iml->next_rcu;
1878
1879                 if (in_dev)
1880                         ip_mc_dec_group(in_dev, group);
1881                 rtnl_unlock();
1882                 /* decrease mem now to avoid the memleak warning */
1883                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1884                 kfree_rcu(iml, rcu);
1885                 return 0;
1886         }
1887         if (!in_dev)
1888                 ret = -ENODEV;
1889         rtnl_unlock();
1890         return ret;
1891 }
1892
1893 int ip_mc_source(int add, int omode, struct sock *sk, struct
1894         ip_mreq_source *mreqs, int ifindex)
1895 {
1896         int err;
1897         struct ip_mreqn imr;
1898         __be32 addr = mreqs->imr_multiaddr;
1899         struct ip_mc_socklist *pmc;
1900         struct in_device *in_dev = NULL;
1901         struct inet_sock *inet = inet_sk(sk);
1902         struct ip_sf_socklist *psl;
1903         struct net *net = sock_net(sk);
1904         int leavegroup = 0;
1905         int i, j, rv;
1906
1907         if (!ipv4_is_multicast(addr))
1908                 return -EINVAL;
1909
1910         rtnl_lock();
1911
1912         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1913         imr.imr_address.s_addr = mreqs->imr_interface;
1914         imr.imr_ifindex = ifindex;
1915         in_dev = ip_mc_find_dev(net, &imr);
1916
1917         if (!in_dev) {
1918                 err = -ENODEV;
1919                 goto done;
1920         }
1921         err = -EADDRNOTAVAIL;
1922
1923         for_each_pmc_rtnl(inet, pmc) {
1924                 if ((pmc->multi.imr_multiaddr.s_addr ==
1925                      imr.imr_multiaddr.s_addr) &&
1926                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
1927                         break;
1928         }
1929         if (!pmc) {             /* must have a prior join */
1930                 err = -EINVAL;
1931                 goto done;
1932         }
1933         /* if a source filter was set, must be the same mode as before */
1934         if (pmc->sflist) {
1935                 if (pmc->sfmode != omode) {
1936                         err = -EINVAL;
1937                         goto done;
1938                 }
1939         } else if (pmc->sfmode != omode) {
1940                 /* allow mode switches for empty-set filters */
1941                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1942                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1943                         NULL, 0);
1944                 pmc->sfmode = omode;
1945         }
1946
1947         psl = rtnl_dereference(pmc->sflist);
1948         if (!add) {
1949                 if (!psl)
1950                         goto done;      /* err = -EADDRNOTAVAIL */
1951                 rv = !0;
1952                 for (i=0; i<psl->sl_count; i++) {
1953                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1954                                 sizeof(__be32));
1955                         if (rv == 0)
1956                                 break;
1957                 }
1958                 if (rv)         /* source not found */
1959                         goto done;      /* err = -EADDRNOTAVAIL */
1960
1961                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1962                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1963                         leavegroup = 1;
1964                         goto done;
1965                 }
1966
1967                 /* update the interface filter */
1968                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1969                         &mreqs->imr_sourceaddr, 1);
1970
1971                 for (j=i+1; j<psl->sl_count; j++)
1972                         psl->sl_addr[j-1] = psl->sl_addr[j];
1973                 psl->sl_count--;
1974                 err = 0;
1975                 goto done;
1976         }
1977         /* else, add a new source to the filter */
1978
1979         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1980                 err = -ENOBUFS;
1981                 goto done;
1982         }
1983         if (!psl || psl->sl_count == psl->sl_max) {
1984                 struct ip_sf_socklist *newpsl;
1985                 int count = IP_SFBLOCK;
1986
1987                 if (psl)
1988                         count += psl->sl_max;
1989                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1990                 if (!newpsl) {
1991                         err = -ENOBUFS;
1992                         goto done;
1993                 }
1994                 newpsl->sl_max = count;
1995                 newpsl->sl_count = count - IP_SFBLOCK;
1996                 if (psl) {
1997                         for (i=0; i<psl->sl_count; i++)
1998                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1999                         /* decrease mem now to avoid the memleak warning */
2000                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2001                         kfree_rcu(psl, rcu);
2002                 }
2003                 rcu_assign_pointer(pmc->sflist, newpsl);
2004                 psl = newpsl;
2005         }
2006         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2007         for (i=0; i<psl->sl_count; i++) {
2008                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2009                         sizeof(__be32));
2010                 if (rv == 0)
2011                         break;
2012         }
2013         if (rv == 0)            /* address already there is an error */
2014                 goto done;
2015         for (j=psl->sl_count-1; j>=i; j--)
2016                 psl->sl_addr[j+1] = psl->sl_addr[j];
2017         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2018         psl->sl_count++;
2019         err = 0;
2020         /* update the interface list */
2021         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2022                 &mreqs->imr_sourceaddr, 1);
2023 done:
2024         rtnl_unlock();
2025         if (leavegroup)
2026                 return ip_mc_leave_group(sk, &imr);
2027         return err;
2028 }
2029
2030 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2031 {
2032         int err = 0;
2033         struct ip_mreqn imr;
2034         __be32 addr = msf->imsf_multiaddr;
2035         struct ip_mc_socklist *pmc;
2036         struct in_device *in_dev;
2037         struct inet_sock *inet = inet_sk(sk);
2038         struct ip_sf_socklist *newpsl, *psl;
2039         struct net *net = sock_net(sk);
2040         int leavegroup = 0;
2041
2042         if (!ipv4_is_multicast(addr))
2043                 return -EINVAL;
2044         if (msf->imsf_fmode != MCAST_INCLUDE &&
2045             msf->imsf_fmode != MCAST_EXCLUDE)
2046                 return -EINVAL;
2047
2048         rtnl_lock();
2049
2050         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2051         imr.imr_address.s_addr = msf->imsf_interface;
2052         imr.imr_ifindex = ifindex;
2053         in_dev = ip_mc_find_dev(net, &imr);
2054
2055         if (!in_dev) {
2056                 err = -ENODEV;
2057                 goto done;
2058         }
2059
2060         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2061         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2062                 leavegroup = 1;
2063                 goto done;
2064         }
2065
2066         for_each_pmc_rtnl(inet, pmc) {
2067                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2068                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2069                         break;
2070         }
2071         if (!pmc) {             /* must have a prior join */
2072                 err = -EINVAL;
2073                 goto done;
2074         }
2075         if (msf->imsf_numsrc) {
2076                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2077                                                            GFP_KERNEL);
2078                 if (!newpsl) {
2079                         err = -ENOBUFS;
2080                         goto done;
2081                 }
2082                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2083                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2084                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2085                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2086                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2087                 if (err) {
2088                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2089                         goto done;
2090                 }
2091         } else {
2092                 newpsl = NULL;
2093                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2094                                      msf->imsf_fmode, 0, NULL, 0);
2095         }
2096         psl = rtnl_dereference(pmc->sflist);
2097         if (psl) {
2098                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2099                         psl->sl_count, psl->sl_addr, 0);
2100                 /* decrease mem now to avoid the memleak warning */
2101                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2102                 kfree_rcu(psl, rcu);
2103         } else
2104                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2105                         0, NULL, 0);
2106         rcu_assign_pointer(pmc->sflist, newpsl);
2107         pmc->sfmode = msf->imsf_fmode;
2108         err = 0;
2109 done:
2110         rtnl_unlock();
2111         if (leavegroup)
2112                 err = ip_mc_leave_group(sk, &imr);
2113         return err;
2114 }
2115
2116 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2117         struct ip_msfilter __user *optval, int __user *optlen)
2118 {
2119         int err, len, count, copycount;
2120         struct ip_mreqn imr;
2121         __be32 addr = msf->imsf_multiaddr;
2122         struct ip_mc_socklist *pmc;
2123         struct in_device *in_dev;
2124         struct inet_sock *inet = inet_sk(sk);
2125         struct ip_sf_socklist *psl;
2126         struct net *net = sock_net(sk);
2127
2128         if (!ipv4_is_multicast(addr))
2129                 return -EINVAL;
2130
2131         rtnl_lock();
2132
2133         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2134         imr.imr_address.s_addr = msf->imsf_interface;
2135         imr.imr_ifindex = 0;
2136         in_dev = ip_mc_find_dev(net, &imr);
2137
2138         if (!in_dev) {
2139                 err = -ENODEV;
2140                 goto done;
2141         }
2142         err = -EADDRNOTAVAIL;
2143
2144         for_each_pmc_rtnl(inet, pmc) {
2145                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2146                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2147                         break;
2148         }
2149         if (!pmc)               /* must have a prior join */
2150                 goto done;
2151         msf->imsf_fmode = pmc->sfmode;
2152         psl = rtnl_dereference(pmc->sflist);
2153         rtnl_unlock();
2154         if (!psl) {
2155                 len = 0;
2156                 count = 0;
2157         } else {
2158                 count = psl->sl_count;
2159         }
2160         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2161         len = copycount * sizeof(psl->sl_addr[0]);
2162         msf->imsf_numsrc = count;
2163         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2164             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2165                 return -EFAULT;
2166         }
2167         if (len &&
2168             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2169                 return -EFAULT;
2170         return 0;
2171 done:
2172         rtnl_unlock();
2173         return err;
2174 }
2175
2176 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2177         struct group_filter __user *optval, int __user *optlen)
2178 {
2179         int err, i, count, copycount;
2180         struct sockaddr_in *psin;
2181         __be32 addr;
2182         struct ip_mc_socklist *pmc;
2183         struct inet_sock *inet = inet_sk(sk);
2184         struct ip_sf_socklist *psl;
2185
2186         psin = (struct sockaddr_in *)&gsf->gf_group;
2187         if (psin->sin_family != AF_INET)
2188                 return -EINVAL;
2189         addr = psin->sin_addr.s_addr;
2190         if (!ipv4_is_multicast(addr))
2191                 return -EINVAL;
2192
2193         rtnl_lock();
2194
2195         err = -EADDRNOTAVAIL;
2196
2197         for_each_pmc_rtnl(inet, pmc) {
2198                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2199                     pmc->multi.imr_ifindex == gsf->gf_interface)
2200                         break;
2201         }
2202         if (!pmc)               /* must have a prior join */
2203                 goto done;
2204         gsf->gf_fmode = pmc->sfmode;
2205         psl = rtnl_dereference(pmc->sflist);
2206         rtnl_unlock();
2207         count = psl ? psl->sl_count : 0;
2208         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2209         gsf->gf_numsrc = count;
2210         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2211             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2212                 return -EFAULT;
2213         }
2214         for (i=0; i<copycount; i++) {
2215                 struct sockaddr_storage ss;
2216
2217                 psin = (struct sockaddr_in *)&ss;
2218                 memset(&ss, 0, sizeof(ss));
2219                 psin->sin_family = AF_INET;
2220                 psin->sin_addr.s_addr = psl->sl_addr[i];
2221                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2222                         return -EFAULT;
2223         }
2224         return 0;
2225 done:
2226         rtnl_unlock();
2227         return err;
2228 }
2229
2230 /*
2231  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2232  */
2233 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2234 {
2235         struct inet_sock *inet = inet_sk(sk);
2236         struct ip_mc_socklist *pmc;
2237         struct ip_sf_socklist *psl;
2238         int i;
2239         int ret;
2240
2241         ret = 1;
2242         if (!ipv4_is_multicast(loc_addr))
2243                 goto out;
2244
2245         rcu_read_lock();
2246         for_each_pmc_rcu(inet, pmc) {
2247                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2248                     pmc->multi.imr_ifindex == dif)
2249                         break;
2250         }
2251         ret = inet->mc_all;
2252         if (!pmc)
2253                 goto unlock;
2254         psl = rcu_dereference(pmc->sflist);
2255         ret = (pmc->sfmode == MCAST_EXCLUDE);
2256         if (!psl)
2257                 goto unlock;
2258
2259         for (i=0; i<psl->sl_count; i++) {
2260                 if (psl->sl_addr[i] == rmt_addr)
2261                         break;
2262         }
2263         ret = 0;
2264         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2265                 goto unlock;
2266         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2267                 goto unlock;
2268         ret = 1;
2269 unlock:
2270         rcu_read_unlock();
2271 out:
2272         return ret;
2273 }
2274
2275 /*
2276  *      A socket is closing.
2277  */
2278
2279 void ip_mc_drop_socket(struct sock *sk)
2280 {
2281         struct inet_sock *inet = inet_sk(sk);
2282         struct ip_mc_socklist *iml;
2283         struct net *net = sock_net(sk);
2284
2285         if (inet->mc_list == NULL)
2286                 return;
2287
2288         rtnl_lock();
2289         while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2290                 struct in_device *in_dev;
2291
2292                 inet->mc_list = iml->next_rcu;
2293                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2294                 (void) ip_mc_leave_src(sk, iml, in_dev);
2295                 if (in_dev != NULL)
2296                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2297                 /* decrease mem now to avoid the memleak warning */
2298                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2299                 kfree_rcu(iml, rcu);
2300         }
2301         rtnl_unlock();
2302 }
2303
2304 /* called with rcu_read_lock() */
2305 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2306 {
2307         struct ip_mc_list *im;
2308         struct ip_sf_list *psf;
2309         int rv = 0;
2310
2311         for_each_pmc_rcu(in_dev, im) {
2312                 if (im->multiaddr == mc_addr)
2313                         break;
2314         }
2315         if (im && proto == IPPROTO_IGMP) {
2316                 rv = 1;
2317         } else if (im) {
2318                 if (src_addr) {
2319                         for (psf=im->sources; psf; psf=psf->sf_next) {
2320                                 if (psf->sf_inaddr == src_addr)
2321                                         break;
2322                         }
2323                         if (psf)
2324                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2325                                         psf->sf_count[MCAST_EXCLUDE] !=
2326                                         im->sfcount[MCAST_EXCLUDE];
2327                         else
2328                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2329                 } else
2330                         rv = 1; /* unspecified source; tentatively allow */
2331         }
2332         return rv;
2333 }
2334
2335 #if defined(CONFIG_PROC_FS)
2336 struct igmp_mc_iter_state {
2337         struct seq_net_private p;
2338         struct net_device *dev;
2339         struct in_device *in_dev;
2340 };
2341
2342 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2343
2344 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2345 {
2346         struct net *net = seq_file_net(seq);
2347         struct ip_mc_list *im = NULL;
2348         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2349
2350         state->in_dev = NULL;
2351         for_each_netdev_rcu(net, state->dev) {
2352                 struct in_device *in_dev;
2353
2354                 in_dev = __in_dev_get_rcu(state->dev);
2355                 if (!in_dev)
2356                         continue;
2357                 im = rcu_dereference(in_dev->mc_list);
2358                 if (im) {
2359                         state->in_dev = in_dev;
2360                         break;
2361                 }
2362         }
2363         return im;
2364 }
2365
2366 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2367 {
2368         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2369
2370         im = rcu_dereference(im->next_rcu);
2371         while (!im) {
2372                 state->dev = next_net_device_rcu(state->dev);
2373                 if (!state->dev) {
2374                         state->in_dev = NULL;
2375                         break;
2376                 }
2377                 state->in_dev = __in_dev_get_rcu(state->dev);
2378                 if (!state->in_dev)
2379                         continue;
2380                 im = rcu_dereference(state->in_dev->mc_list);
2381         }
2382         return im;
2383 }
2384
2385 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2386 {
2387         struct ip_mc_list *im = igmp_mc_get_first(seq);
2388         if (im)
2389                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2390                         --pos;
2391         return pos ? NULL : im;
2392 }
2393
2394 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2395         __acquires(rcu)
2396 {
2397         rcu_read_lock();
2398         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2399 }
2400
2401 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2402 {
2403         struct ip_mc_list *im;
2404         if (v == SEQ_START_TOKEN)
2405                 im = igmp_mc_get_first(seq);
2406         else
2407                 im = igmp_mc_get_next(seq, v);
2408         ++*pos;
2409         return im;
2410 }
2411
2412 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2413         __releases(rcu)
2414 {
2415         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2416
2417         state->in_dev = NULL;
2418         state->dev = NULL;
2419         rcu_read_unlock();
2420 }
2421
2422 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2423 {
2424         if (v == SEQ_START_TOKEN)
2425                 seq_puts(seq,
2426                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2427         else {
2428                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2429                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2430                 char   *querier;
2431 #ifdef CONFIG_IP_MULTICAST
2432                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2433                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2434                           "V3";
2435 #else
2436                 querier = "NONE";
2437 #endif
2438
2439                 if (rcu_dereference(state->in_dev->mc_list) == im) {
2440                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2441                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2442                 }
2443
2444                 seq_printf(seq,
2445                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2446                            im->multiaddr, im->users,
2447                            im->tm_running, im->tm_running ?
2448                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2449                            im->reporter);
2450         }
2451         return 0;
2452 }
2453
2454 static const struct seq_operations igmp_mc_seq_ops = {
2455         .start  =       igmp_mc_seq_start,
2456         .next   =       igmp_mc_seq_next,
2457         .stop   =       igmp_mc_seq_stop,
2458         .show   =       igmp_mc_seq_show,
2459 };
2460
2461 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2462 {
2463         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2464                         sizeof(struct igmp_mc_iter_state));
2465 }
2466
2467 static const struct file_operations igmp_mc_seq_fops = {
2468         .owner          =       THIS_MODULE,
2469         .open           =       igmp_mc_seq_open,
2470         .read           =       seq_read,
2471         .llseek         =       seq_lseek,
2472         .release        =       seq_release_net,
2473 };
2474
2475 struct igmp_mcf_iter_state {
2476         struct seq_net_private p;
2477         struct net_device *dev;
2478         struct in_device *idev;
2479         struct ip_mc_list *im;
2480 };
2481
2482 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2483
2484 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2485 {
2486         struct net *net = seq_file_net(seq);
2487         struct ip_sf_list *psf = NULL;
2488         struct ip_mc_list *im = NULL;
2489         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2490
2491         state->idev = NULL;
2492         state->im = NULL;
2493         for_each_netdev_rcu(net, state->dev) {
2494                 struct in_device *idev;
2495                 idev = __in_dev_get_rcu(state->dev);
2496                 if (unlikely(idev == NULL))
2497                         continue;
2498                 im = rcu_dereference(idev->mc_list);
2499                 if (likely(im != NULL)) {
2500                         spin_lock_bh(&im->lock);
2501                         psf = im->sources;
2502                         if (likely(psf != NULL)) {
2503                                 state->im = im;
2504                                 state->idev = idev;
2505                                 break;
2506                         }
2507                         spin_unlock_bh(&im->lock);
2508                 }
2509         }
2510         return psf;
2511 }
2512
2513 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2514 {
2515         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2516
2517         psf = psf->sf_next;
2518         while (!psf) {
2519                 spin_unlock_bh(&state->im->lock);
2520                 state->im = state->im->next;
2521                 while (!state->im) {
2522                         state->dev = next_net_device_rcu(state->dev);
2523                         if (!state->dev) {
2524                                 state->idev = NULL;
2525                                 goto out;
2526                         }
2527                         state->idev = __in_dev_get_rcu(state->dev);
2528                         if (!state->idev)
2529                                 continue;
2530                         state->im = rcu_dereference(state->idev->mc_list);
2531                 }
2532                 if (!state->im)
2533                         break;
2534                 spin_lock_bh(&state->im->lock);
2535                 psf = state->im->sources;
2536         }
2537 out:
2538         return psf;
2539 }
2540
2541 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2542 {
2543         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2544         if (psf)
2545                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2546                         --pos;
2547         return pos ? NULL : psf;
2548 }
2549
2550 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2551         __acquires(rcu)
2552 {
2553         rcu_read_lock();
2554         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2555 }
2556
2557 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2558 {
2559         struct ip_sf_list *psf;
2560         if (v == SEQ_START_TOKEN)
2561                 psf = igmp_mcf_get_first(seq);
2562         else
2563                 psf = igmp_mcf_get_next(seq, v);
2564         ++*pos;
2565         return psf;
2566 }
2567
2568 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2569         __releases(rcu)
2570 {
2571         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2572         if (likely(state->im != NULL)) {
2573                 spin_unlock_bh(&state->im->lock);
2574                 state->im = NULL;
2575         }
2576         state->idev = NULL;
2577         state->dev = NULL;
2578         rcu_read_unlock();
2579 }
2580
2581 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2582 {
2583         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2584         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2585
2586         if (v == SEQ_START_TOKEN) {
2587                 seq_printf(seq,
2588                            "%3s %6s "
2589                            "%10s %10s %6s %6s\n", "Idx",
2590                            "Device", "MCA",
2591                            "SRC", "INC", "EXC");
2592         } else {
2593                 seq_printf(seq,
2594                            "%3d %6.6s 0x%08x "
2595                            "0x%08x %6lu %6lu\n",
2596                            state->dev->ifindex, state->dev->name,
2597                            ntohl(state->im->multiaddr),
2598                            ntohl(psf->sf_inaddr),
2599                            psf->sf_count[MCAST_INCLUDE],
2600                            psf->sf_count[MCAST_EXCLUDE]);
2601         }
2602         return 0;
2603 }
2604
2605 static const struct seq_operations igmp_mcf_seq_ops = {
2606         .start  =       igmp_mcf_seq_start,
2607         .next   =       igmp_mcf_seq_next,
2608         .stop   =       igmp_mcf_seq_stop,
2609         .show   =       igmp_mcf_seq_show,
2610 };
2611
2612 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2613 {
2614         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2615                         sizeof(struct igmp_mcf_iter_state));
2616 }
2617
2618 static const struct file_operations igmp_mcf_seq_fops = {
2619         .owner          =       THIS_MODULE,
2620         .open           =       igmp_mcf_seq_open,
2621         .read           =       seq_read,
2622         .llseek         =       seq_lseek,
2623         .release        =       seq_release_net,
2624 };
2625
2626 static int __net_init igmp_net_init(struct net *net)
2627 {
2628         struct proc_dir_entry *pde;
2629
2630         pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2631         if (!pde)
2632                 goto out_igmp;
2633         pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2634         if (!pde)
2635                 goto out_mcfilter;
2636         return 0;
2637
2638 out_mcfilter:
2639         proc_net_remove(net, "igmp");
2640 out_igmp:
2641         return -ENOMEM;
2642 }
2643
2644 static void __net_exit igmp_net_exit(struct net *net)
2645 {
2646         proc_net_remove(net, "mcfilter");
2647         proc_net_remove(net, "igmp");
2648 }
2649
2650 static struct pernet_operations igmp_net_ops = {
2651         .init = igmp_net_init,
2652         .exit = igmp_net_exit,
2653 };
2654
2655 int __init igmp_mc_proc_init(void)
2656 {
2657         return register_pernet_subsys(&igmp_net_ops);
2658 }
2659 #endif