[IPSEC]: Make callers of xfrm_lookup to use XFRM_LOOKUP_WAIT
[linux-2.6] / 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  *      Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
12  *
13  *      Authors:
14  *              Alan Cox <Alan.Cox@linux.org>
15  *
16  *      This program is free software; you can redistribute it and/or
17  *      modify it under the terms of the GNU General Public License
18  *      as published by the Free Software Foundation; either version
19  *      2 of the License, or (at your option) any later version.
20  *
21  *      Fixes:
22  *
23  *              Alan Cox        :       Added lots of __inline__ to optimise
24  *                                      the memory usage of all the tiny little
25  *                                      functions.
26  *              Alan Cox        :       Dumped the header building experiment.
27  *              Alan Cox        :       Minor tweaks ready for multicast routing
28  *                                      and extended IGMP protocol.
29  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
30  *                                      writes utterly bogus code otherwise (sigh)
31  *                                      fixed IGMP loopback to behave in the manner
32  *                                      desired by mrouted, fixed the fact it has been
33  *                                      broken since 1.3.6 and cleaned up a few minor
34  *                                      points.
35  *
36  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
37  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
38  *                                      The enhancements are mainly based on Steve Deering's
39  *                                      ipmulti-3.5 source code.
40  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
41  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
42  *                                      the mrouted version on that device.
43  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
44  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
45  *                                      to identify the multicast router version
46  *                                      and do what the IGMP version 2 specified.
47  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
48  *              Tsu-Sheng Tsao          if the specified time expired.
49  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
50  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
51  *              Christian Daudt :       igmp timer wasn't set for local group
52  *                                      memberships but was being deleted,
53  *                                      which caused a "del_timer() called
54  *                                      from %p with timer not initialized\n"
55  *                                      message (960131).
56  *              Christian Daudt :       removed del_timer from
57  *                                      igmp_timer_expire function (960205).
58  *             Christian Daudt :       igmp_heard_report now only calls
59  *                                     igmp_timer_expire if tm->running is
60  *                                     true (960216).
61  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
62  *                                      igmp_heard_query never trigger. Expiry
63  *                                      miscalculation fixed in igmp_heard_query
64  *                                      and random() made to return unsigned to
65  *                                      prevent negative expiry times.
66  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
67  *                                      fix from pending 2.1.x patches.
68  *              Alan Cox:               Forget to enable FDDI support earlier.
69  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
70  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
71  *              David L Stevens:        IGMPv3 support, with help from
72  *                                      Vinay Kulkarni
73  */
74
75 #include <linux/module.h>
76 #include <asm/uaccess.h>
77 #include <asm/system.h>
78 #include <linux/types.h>
79 #include <linux/kernel.h>
80 #include <linux/jiffies.h>
81 #include <linux/string.h>
82 #include <linux/socket.h>
83 #include <linux/sockios.h>
84 #include <linux/in.h>
85 #include <linux/inet.h>
86 #include <linux/netdevice.h>
87 #include <linux/skbuff.h>
88 #include <linux/inetdevice.h>
89 #include <linux/igmp.h>
90 #include <linux/if_arp.h>
91 #include <linux/rtnetlink.h>
92 #include <linux/times.h>
93
94 #include <net/net_namespace.h>
95 #include <net/arp.h>
96 #include <net/ip.h>
97 #include <net/protocol.h>
98 #include <net/route.h>
99 #include <net/sock.h>
100 #include <net/checksum.h>
101 #include <linux/netfilter_ipv4.h>
102 #ifdef CONFIG_IP_MROUTE
103 #include <linux/mroute.h>
104 #endif
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
108 #endif
109
110 #define IP_MAX_MEMBERSHIPS      20
111 #define IP_MAX_MSF              10
112
113 #ifdef CONFIG_IP_MULTICAST
114 /* Parameter names and values are taken from igmp-v2-06 draft */
115
116 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
117 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
118 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
119 #define IGMP_Query_Response_Interval            (10*HZ)
120 #define IGMP_Unsolicited_Report_Count           2
121
122
123 #define IGMP_Initial_Report_Delay               (1)
124
125 /* IGMP_Initial_Report_Delay is not from IGMP specs!
126  * IGMP specs require to report membership immediately after
127  * joining a group, but we delay the first report by a
128  * small interval. It seems more natural and still does not
129  * contradict to specs provided this delay is small enough.
130  */
131
132 #define IGMP_V1_SEEN(in_dev) \
133         (IPV4_DEVCONF_ALL(FORCE_IGMP_VERSION) == 1 || \
134          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
135          ((in_dev)->mr_v1_seen && \
136           time_before(jiffies, (in_dev)->mr_v1_seen)))
137 #define IGMP_V2_SEEN(in_dev) \
138         (IPV4_DEVCONF_ALL(FORCE_IGMP_VERSION) == 2 || \
139          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
140          ((in_dev)->mr_v2_seen && \
141           time_before(jiffies, (in_dev)->mr_v2_seen)))
142
143 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
144 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
145 static void igmpv3_clear_delrec(struct in_device *in_dev);
146 static int sf_setstate(struct ip_mc_list *pmc);
147 static void sf_markstate(struct ip_mc_list *pmc);
148 #endif
149 static void ip_mc_clear_src(struct ip_mc_list *pmc);
150 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
151                          int sfcount, __be32 *psfsrc, int delta);
152
153 static void ip_ma_put(struct ip_mc_list *im)
154 {
155         if (atomic_dec_and_test(&im->refcnt)) {
156                 in_dev_put(im->interface);
157                 kfree(im);
158         }
159 }
160
161 #ifdef CONFIG_IP_MULTICAST
162
163 /*
164  *      Timer management
165  */
166
167 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
168 {
169         spin_lock_bh(&im->lock);
170         if (del_timer(&im->timer))
171                 atomic_dec(&im->refcnt);
172         im->tm_running=0;
173         im->reporter = 0;
174         im->unsolicit_count = 0;
175         spin_unlock_bh(&im->lock);
176 }
177
178 /* It must be called with locked im->lock */
179 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
180 {
181         int tv=net_random() % max_delay;
182
183         im->tm_running=1;
184         if (!mod_timer(&im->timer, jiffies+tv+2))
185                 atomic_inc(&im->refcnt);
186 }
187
188 static void igmp_gq_start_timer(struct in_device *in_dev)
189 {
190         int tv = net_random() % in_dev->mr_maxdelay;
191
192         in_dev->mr_gq_running = 1;
193         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
194                 in_dev_hold(in_dev);
195 }
196
197 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
198 {
199         int tv = net_random() % delay;
200
201         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
202                 in_dev_hold(in_dev);
203 }
204
205 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
206 {
207         spin_lock_bh(&im->lock);
208         im->unsolicit_count = 0;
209         if (del_timer(&im->timer)) {
210                 if ((long)(im->timer.expires-jiffies) < max_delay) {
211                         add_timer(&im->timer);
212                         im->tm_running=1;
213                         spin_unlock_bh(&im->lock);
214                         return;
215                 }
216                 atomic_dec(&im->refcnt);
217         }
218         igmp_start_timer(im, max_delay);
219         spin_unlock_bh(&im->lock);
220 }
221
222
223 /*
224  *      Send an IGMP report.
225  */
226
227 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
228
229
230 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
231         int gdeleted, int sdeleted)
232 {
233         switch (type) {
234         case IGMPV3_MODE_IS_INCLUDE:
235         case IGMPV3_MODE_IS_EXCLUDE:
236                 if (gdeleted || sdeleted)
237                         return 0;
238                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
239                         if (pmc->sfmode == MCAST_INCLUDE)
240                                 return 1;
241                         /* don't include if this source is excluded
242                          * in all filters
243                          */
244                         if (psf->sf_count[MCAST_INCLUDE])
245                                 return type == IGMPV3_MODE_IS_INCLUDE;
246                         return pmc->sfcount[MCAST_EXCLUDE] ==
247                                 psf->sf_count[MCAST_EXCLUDE];
248                 }
249                 return 0;
250         case IGMPV3_CHANGE_TO_INCLUDE:
251                 if (gdeleted || sdeleted)
252                         return 0;
253                 return psf->sf_count[MCAST_INCLUDE] != 0;
254         case IGMPV3_CHANGE_TO_EXCLUDE:
255                 if (gdeleted || sdeleted)
256                         return 0;
257                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
258                     psf->sf_count[MCAST_INCLUDE])
259                         return 0;
260                 return pmc->sfcount[MCAST_EXCLUDE] ==
261                         psf->sf_count[MCAST_EXCLUDE];
262         case IGMPV3_ALLOW_NEW_SOURCES:
263                 if (gdeleted || !psf->sf_crcount)
264                         return 0;
265                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
266         case IGMPV3_BLOCK_OLD_SOURCES:
267                 if (pmc->sfmode == MCAST_INCLUDE)
268                         return gdeleted || (psf->sf_crcount && sdeleted);
269                 return psf->sf_crcount && !gdeleted && !sdeleted;
270         }
271         return 0;
272 }
273
274 static int
275 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
276 {
277         struct ip_sf_list *psf;
278         int scount = 0;
279
280         for (psf=pmc->sources; psf; psf=psf->sf_next) {
281                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
282                         continue;
283                 scount++;
284         }
285         return scount;
286 }
287
288 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
289 {
290         struct sk_buff *skb;
291         struct rtable *rt;
292         struct iphdr *pip;
293         struct igmpv3_report *pig;
294
295         skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
296         if (skb == NULL)
297                 return NULL;
298
299         {
300                 struct flowi fl = { .oif = dev->ifindex,
301                                     .nl_u = { .ip4_u = {
302                                     .daddr = IGMPV3_ALL_MCR } },
303                                     .proto = IPPROTO_IGMP };
304                 if (ip_route_output_key(&rt, &fl)) {
305                         kfree_skb(skb);
306                         return NULL;
307                 }
308         }
309         if (rt->rt_src == 0) {
310                 kfree_skb(skb);
311                 ip_rt_put(rt);
312                 return NULL;
313         }
314
315         skb->dst = &rt->u.dst;
316         skb->dev = dev;
317
318         skb_reserve(skb, LL_RESERVED_SPACE(dev));
319
320         skb_reset_network_header(skb);
321         pip = ip_hdr(skb);
322         skb_put(skb, sizeof(struct iphdr) + 4);
323
324         pip->version  = 4;
325         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
326         pip->tos      = 0xc0;
327         pip->frag_off = htons(IP_DF);
328         pip->ttl      = 1;
329         pip->daddr    = rt->rt_dst;
330         pip->saddr    = rt->rt_src;
331         pip->protocol = IPPROTO_IGMP;
332         pip->tot_len  = 0;      /* filled in later */
333         ip_select_ident(pip, &rt->u.dst, NULL);
334         ((u8*)&pip[1])[0] = IPOPT_RA;
335         ((u8*)&pip[1])[1] = 4;
336         ((u8*)&pip[1])[2] = 0;
337         ((u8*)&pip[1])[3] = 0;
338
339         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
340         skb_put(skb, sizeof(*pig));
341         pig = igmpv3_report_hdr(skb);
342         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
343         pig->resv1 = 0;
344         pig->csum = 0;
345         pig->resv2 = 0;
346         pig->ngrec = 0;
347         return skb;
348 }
349
350 static int igmpv3_sendpack(struct sk_buff *skb)
351 {
352         struct igmphdr *pig = igmp_hdr(skb);
353         const int igmplen = skb->tail - skb->transport_header;
354
355         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
356
357         return ip_local_out(skb);
358 }
359
360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
361 {
362         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
363 }
364
365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
366         int type, struct igmpv3_grec **ppgr)
367 {
368         struct net_device *dev = pmc->interface->dev;
369         struct igmpv3_report *pih;
370         struct igmpv3_grec *pgr;
371
372         if (!skb)
373                 skb = igmpv3_newpack(dev, dev->mtu);
374         if (!skb)
375                 return NULL;
376         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
377         pgr->grec_type = type;
378         pgr->grec_auxwords = 0;
379         pgr->grec_nsrcs = 0;
380         pgr->grec_mca = pmc->multiaddr;
381         pih = igmpv3_report_hdr(skb);
382         pih->ngrec = htons(ntohs(pih->ngrec)+1);
383         *ppgr = pgr;
384         return skb;
385 }
386
387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
388         skb_tailroom(skb)) : 0)
389
390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
391         int type, int gdeleted, int sdeleted)
392 {
393         struct net_device *dev = pmc->interface->dev;
394         struct igmpv3_report *pih;
395         struct igmpv3_grec *pgr = NULL;
396         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
397         int scount, stotal, first, isquery, truncate;
398
399         if (pmc->multiaddr == IGMP_ALL_HOSTS)
400                 return skb;
401
402         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
403                   type == IGMPV3_MODE_IS_EXCLUDE;
404         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
405                     type == IGMPV3_CHANGE_TO_EXCLUDE;
406
407         stotal = scount = 0;
408
409         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
410
411         if (!*psf_list)
412                 goto empty_source;
413
414         pih = skb ? igmpv3_report_hdr(skb) : NULL;
415
416         /* EX and TO_EX get a fresh packet, if needed */
417         if (truncate) {
418                 if (pih && pih->ngrec &&
419                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
420                         if (skb)
421                                 igmpv3_sendpack(skb);
422                         skb = igmpv3_newpack(dev, dev->mtu);
423                 }
424         }
425         first = 1;
426         psf_prev = NULL;
427         for (psf=*psf_list; psf; psf=psf_next) {
428                 __be32 *psrc;
429
430                 psf_next = psf->sf_next;
431
432                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
433                         psf_prev = psf;
434                         continue;
435                 }
436
437                 /* clear marks on query responses */
438                 if (isquery)
439                         psf->sf_gsresp = 0;
440
441                 if (AVAILABLE(skb) < sizeof(__be32) +
442                     first*sizeof(struct igmpv3_grec)) {
443                         if (truncate && !first)
444                                 break;   /* truncate these */
445                         if (pgr)
446                                 pgr->grec_nsrcs = htons(scount);
447                         if (skb)
448                                 igmpv3_sendpack(skb);
449                         skb = igmpv3_newpack(dev, dev->mtu);
450                         first = 1;
451                         scount = 0;
452                 }
453                 if (first) {
454                         skb = add_grhead(skb, pmc, type, &pgr);
455                         first = 0;
456                 }
457                 if (!skb)
458                         return NULL;
459                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
460                 *psrc = psf->sf_inaddr;
461                 scount++; stotal++;
462                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
463                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
464                         psf->sf_crcount--;
465                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
466                                 if (psf_prev)
467                                         psf_prev->sf_next = psf->sf_next;
468                                 else
469                                         *psf_list = psf->sf_next;
470                                 kfree(psf);
471                                 continue;
472                         }
473                 }
474                 psf_prev = psf;
475         }
476
477 empty_source:
478         if (!stotal) {
479                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
480                     type == IGMPV3_BLOCK_OLD_SOURCES)
481                         return skb;
482                 if (pmc->crcount || isquery) {
483                         /* make sure we have room for group header */
484                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
485                                 igmpv3_sendpack(skb);
486                                 skb = NULL; /* add_grhead will get a new one */
487                         }
488                         skb = add_grhead(skb, pmc, type, &pgr);
489                 }
490         }
491         if (pgr)
492                 pgr->grec_nsrcs = htons(scount);
493
494         if (isquery)
495                 pmc->gsquery = 0;       /* clear query state on report */
496         return skb;
497 }
498
499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
500 {
501         struct sk_buff *skb = NULL;
502         int type;
503
504         if (!pmc) {
505                 read_lock(&in_dev->mc_list_lock);
506                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
507                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
508                                 continue;
509                         spin_lock_bh(&pmc->lock);
510                         if (pmc->sfcount[MCAST_EXCLUDE])
511                                 type = IGMPV3_MODE_IS_EXCLUDE;
512                         else
513                                 type = IGMPV3_MODE_IS_INCLUDE;
514                         skb = add_grec(skb, pmc, type, 0, 0);
515                         spin_unlock_bh(&pmc->lock);
516                 }
517                 read_unlock(&in_dev->mc_list_lock);
518         } else {
519                 spin_lock_bh(&pmc->lock);
520                 if (pmc->sfcount[MCAST_EXCLUDE])
521                         type = IGMPV3_MODE_IS_EXCLUDE;
522                 else
523                         type = IGMPV3_MODE_IS_INCLUDE;
524                 skb = add_grec(skb, pmc, type, 0, 0);
525                 spin_unlock_bh(&pmc->lock);
526         }
527         if (!skb)
528                 return 0;
529         return igmpv3_sendpack(skb);
530 }
531
532 /*
533  * remove zero-count source records from a source filter list
534  */
535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
536 {
537         struct ip_sf_list *psf_prev, *psf_next, *psf;
538
539         psf_prev = NULL;
540         for (psf=*ppsf; psf; psf = psf_next) {
541                 psf_next = psf->sf_next;
542                 if (psf->sf_crcount == 0) {
543                         if (psf_prev)
544                                 psf_prev->sf_next = psf->sf_next;
545                         else
546                                 *ppsf = psf->sf_next;
547                         kfree(psf);
548                 } else
549                         psf_prev = psf;
550         }
551 }
552
553 static void igmpv3_send_cr(struct in_device *in_dev)
554 {
555         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
556         struct sk_buff *skb = NULL;
557         int type, dtype;
558
559         read_lock(&in_dev->mc_list_lock);
560         spin_lock_bh(&in_dev->mc_tomb_lock);
561
562         /* deleted MCA's */
563         pmc_prev = NULL;
564         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
565                 pmc_next = pmc->next;
566                 if (pmc->sfmode == MCAST_INCLUDE) {
567                         type = IGMPV3_BLOCK_OLD_SOURCES;
568                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
569                         skb = add_grec(skb, pmc, type, 1, 0);
570                         skb = add_grec(skb, pmc, dtype, 1, 1);
571                 }
572                 if (pmc->crcount) {
573                         if (pmc->sfmode == MCAST_EXCLUDE) {
574                                 type = IGMPV3_CHANGE_TO_INCLUDE;
575                                 skb = add_grec(skb, pmc, type, 1, 0);
576                         }
577                         pmc->crcount--;
578                         if (pmc->crcount == 0) {
579                                 igmpv3_clear_zeros(&pmc->tomb);
580                                 igmpv3_clear_zeros(&pmc->sources);
581                         }
582                 }
583                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
584                         if (pmc_prev)
585                                 pmc_prev->next = pmc_next;
586                         else
587                                 in_dev->mc_tomb = pmc_next;
588                         in_dev_put(pmc->interface);
589                         kfree(pmc);
590                 } else
591                         pmc_prev = pmc;
592         }
593         spin_unlock_bh(&in_dev->mc_tomb_lock);
594
595         /* change recs */
596         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
597                 spin_lock_bh(&pmc->lock);
598                 if (pmc->sfcount[MCAST_EXCLUDE]) {
599                         type = IGMPV3_BLOCK_OLD_SOURCES;
600                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
601                 } else {
602                         type = IGMPV3_ALLOW_NEW_SOURCES;
603                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
604                 }
605                 skb = add_grec(skb, pmc, type, 0, 0);
606                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
607
608                 /* filter mode changes */
609                 if (pmc->crcount) {
610                         if (pmc->sfmode == MCAST_EXCLUDE)
611                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
612                         else
613                                 type = IGMPV3_CHANGE_TO_INCLUDE;
614                         skb = add_grec(skb, pmc, type, 0, 0);
615                         pmc->crcount--;
616                 }
617                 spin_unlock_bh(&pmc->lock);
618         }
619         read_unlock(&in_dev->mc_list_lock);
620
621         if (!skb)
622                 return;
623         (void) igmpv3_sendpack(skb);
624 }
625
626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
627         int type)
628 {
629         struct sk_buff *skb;
630         struct iphdr *iph;
631         struct igmphdr *ih;
632         struct rtable *rt;
633         struct net_device *dev = in_dev->dev;
634         __be32  group = pmc ? pmc->multiaddr : 0;
635         __be32  dst;
636
637         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
638                 return igmpv3_send_report(in_dev, pmc);
639         else if (type == IGMP_HOST_LEAVE_MESSAGE)
640                 dst = IGMP_ALL_ROUTER;
641         else
642                 dst = group;
643
644         {
645                 struct flowi fl = { .oif = dev->ifindex,
646                                     .nl_u = { .ip4_u = { .daddr = dst } },
647                                     .proto = IPPROTO_IGMP };
648                 if (ip_route_output_key(&rt, &fl))
649                         return -1;
650         }
651         if (rt->rt_src == 0) {
652                 ip_rt_put(rt);
653                 return -1;
654         }
655
656         skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
657         if (skb == NULL) {
658                 ip_rt_put(rt);
659                 return -1;
660         }
661
662         skb->dst = &rt->u.dst;
663
664         skb_reserve(skb, LL_RESERVED_SPACE(dev));
665
666         skb_reset_network_header(skb);
667         iph = ip_hdr(skb);
668         skb_put(skb, sizeof(struct iphdr) + 4);
669
670         iph->version  = 4;
671         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
672         iph->tos      = 0xc0;
673         iph->frag_off = htons(IP_DF);
674         iph->ttl      = 1;
675         iph->daddr    = dst;
676         iph->saddr    = rt->rt_src;
677         iph->protocol = IPPROTO_IGMP;
678         ip_select_ident(iph, &rt->u.dst, NULL);
679         ((u8*)&iph[1])[0] = IPOPT_RA;
680         ((u8*)&iph[1])[1] = 4;
681         ((u8*)&iph[1])[2] = 0;
682         ((u8*)&iph[1])[3] = 0;
683
684         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
685         ih->type=type;
686         ih->code=0;
687         ih->csum=0;
688         ih->group=group;
689         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
690
691         return ip_local_out(skb);
692 }
693
694 static void igmp_gq_timer_expire(unsigned long data)
695 {
696         struct in_device *in_dev = (struct in_device *)data;
697
698         in_dev->mr_gq_running = 0;
699         igmpv3_send_report(in_dev, NULL);
700         __in_dev_put(in_dev);
701 }
702
703 static void igmp_ifc_timer_expire(unsigned long data)
704 {
705         struct in_device *in_dev = (struct in_device *)data;
706
707         igmpv3_send_cr(in_dev);
708         if (in_dev->mr_ifc_count) {
709                 in_dev->mr_ifc_count--;
710                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
711         }
712         __in_dev_put(in_dev);
713 }
714
715 static void igmp_ifc_event(struct in_device *in_dev)
716 {
717         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
718                 return;
719         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
720                 IGMP_Unsolicited_Report_Count;
721         igmp_ifc_start_timer(in_dev, 1);
722 }
723
724
725 static void igmp_timer_expire(unsigned long data)
726 {
727         struct ip_mc_list *im=(struct ip_mc_list *)data;
728         struct in_device *in_dev = im->interface;
729
730         spin_lock(&im->lock);
731         im->tm_running=0;
732
733         if (im->unsolicit_count) {
734                 im->unsolicit_count--;
735                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
736         }
737         im->reporter = 1;
738         spin_unlock(&im->lock);
739
740         if (IGMP_V1_SEEN(in_dev))
741                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
742         else if (IGMP_V2_SEEN(in_dev))
743                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
744         else
745                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
746
747         ip_ma_put(im);
748 }
749
750 /* mark EXCLUDE-mode sources */
751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
752 {
753         struct ip_sf_list *psf;
754         int i, scount;
755
756         scount = 0;
757         for (psf=pmc->sources; psf; psf=psf->sf_next) {
758                 if (scount == nsrcs)
759                         break;
760                 for (i=0; i<nsrcs; i++) {
761                         /* skip inactive filters */
762                         if (pmc->sfcount[MCAST_INCLUDE] ||
763                             pmc->sfcount[MCAST_EXCLUDE] !=
764                             psf->sf_count[MCAST_EXCLUDE])
765                                 continue;
766                         if (srcs[i] == psf->sf_inaddr) {
767                                 scount++;
768                                 break;
769                         }
770                 }
771         }
772         pmc->gsquery = 0;
773         if (scount == nsrcs)    /* all sources excluded */
774                 return 0;
775         return 1;
776 }
777
778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
779 {
780         struct ip_sf_list *psf;
781         int i, scount;
782
783         if (pmc->sfmode == MCAST_EXCLUDE)
784                 return igmp_xmarksources(pmc, nsrcs, srcs);
785
786         /* mark INCLUDE-mode sources */
787         scount = 0;
788         for (psf=pmc->sources; psf; psf=psf->sf_next) {
789                 if (scount == nsrcs)
790                         break;
791                 for (i=0; i<nsrcs; i++)
792                         if (srcs[i] == psf->sf_inaddr) {
793                                 psf->sf_gsresp = 1;
794                                 scount++;
795                                 break;
796                         }
797         }
798         if (!scount) {
799                 pmc->gsquery = 0;
800                 return 0;
801         }
802         pmc->gsquery = 1;
803         return 1;
804 }
805
806 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
807 {
808         struct ip_mc_list *im;
809
810         /* Timers are only set for non-local groups */
811
812         if (group == IGMP_ALL_HOSTS)
813                 return;
814
815         read_lock(&in_dev->mc_list_lock);
816         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
817                 if (im->multiaddr == group) {
818                         igmp_stop_timer(im);
819                         break;
820                 }
821         }
822         read_unlock(&in_dev->mc_list_lock);
823 }
824
825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
826         int len)
827 {
828         struct igmphdr          *ih = igmp_hdr(skb);
829         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
830         struct ip_mc_list       *im;
831         __be32                  group = ih->group;
832         int                     max_delay;
833         int                     mark = 0;
834
835
836         if (len == 8) {
837                 if (ih->code == 0) {
838                         /* Alas, old v1 router presents here. */
839
840                         max_delay = IGMP_Query_Response_Interval;
841                         in_dev->mr_v1_seen = jiffies +
842                                 IGMP_V1_Router_Present_Timeout;
843                         group = 0;
844                 } else {
845                         /* v2 router present */
846                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
847                         in_dev->mr_v2_seen = jiffies +
848                                 IGMP_V2_Router_Present_Timeout;
849                 }
850                 /* cancel the interface change timer */
851                 in_dev->mr_ifc_count = 0;
852                 if (del_timer(&in_dev->mr_ifc_timer))
853                         __in_dev_put(in_dev);
854                 /* clear deleted report items */
855                 igmpv3_clear_delrec(in_dev);
856         } else if (len < 12) {
857                 return; /* ignore bogus packet; freed by caller */
858         } else { /* v3 */
859                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
860                         return;
861
862                 ih3 = igmpv3_query_hdr(skb);
863                 if (ih3->nsrcs) {
864                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
865                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
866                                 return;
867                         ih3 = igmpv3_query_hdr(skb);
868                 }
869
870                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
871                 if (!max_delay)
872                         max_delay = 1;  /* can't mod w/ 0 */
873                 in_dev->mr_maxdelay = max_delay;
874                 if (ih3->qrv)
875                         in_dev->mr_qrv = ih3->qrv;
876                 if (!group) { /* general query */
877                         if (ih3->nsrcs)
878                                 return; /* no sources allowed */
879                         igmp_gq_start_timer(in_dev);
880                         return;
881                 }
882                 /* mark sources to include, if group & source-specific */
883                 mark = ih3->nsrcs != 0;
884         }
885
886         /*
887          * - Start the timers in all of our membership records
888          *   that the query applies to for the interface on
889          *   which the query arrived excl. those that belong
890          *   to a "local" group (224.0.0.X)
891          * - For timers already running check if they need to
892          *   be reset.
893          * - Use the igmp->igmp_code field as the maximum
894          *   delay possible
895          */
896         read_lock(&in_dev->mc_list_lock);
897         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
898                 int changed;
899
900                 if (group && group != im->multiaddr)
901                         continue;
902                 if (im->multiaddr == IGMP_ALL_HOSTS)
903                         continue;
904                 spin_lock_bh(&im->lock);
905                 if (im->tm_running)
906                         im->gsquery = im->gsquery && mark;
907                 else
908                         im->gsquery = mark;
909                 changed = !im->gsquery ||
910                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
911                 spin_unlock_bh(&im->lock);
912                 if (changed)
913                         igmp_mod_timer(im, max_delay);
914         }
915         read_unlock(&in_dev->mc_list_lock);
916 }
917
918 int igmp_rcv(struct sk_buff *skb)
919 {
920         /* This basically follows the spec line by line -- see RFC1112 */
921         struct igmphdr *ih;
922         struct in_device *in_dev = in_dev_get(skb->dev);
923         int len = skb->len;
924
925         if (in_dev==NULL) {
926                 kfree_skb(skb);
927                 return 0;
928         }
929
930         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
931                 goto drop;
932
933         switch (skb->ip_summed) {
934         case CHECKSUM_COMPLETE:
935                 if (!csum_fold(skb->csum))
936                         break;
937                 /* fall through */
938         case CHECKSUM_NONE:
939                 skb->csum = 0;
940                 if (__skb_checksum_complete(skb))
941                         goto drop;
942         }
943
944         ih = igmp_hdr(skb);
945         switch (ih->type) {
946         case IGMP_HOST_MEMBERSHIP_QUERY:
947                 igmp_heard_query(in_dev, skb, len);
948                 break;
949         case IGMP_HOST_MEMBERSHIP_REPORT:
950         case IGMPV2_HOST_MEMBERSHIP_REPORT:
951         case IGMPV3_HOST_MEMBERSHIP_REPORT:
952                 /* Is it our report looped back? */
953                 if (((struct rtable*)skb->dst)->fl.iif == 0)
954                         break;
955                 /* don't rely on MC router hearing unicast reports */
956                 if (skb->pkt_type == PACKET_MULTICAST ||
957                     skb->pkt_type == PACKET_BROADCAST)
958                         igmp_heard_report(in_dev, ih->group);
959                 break;
960         case IGMP_PIM:
961 #ifdef CONFIG_IP_PIMSM_V1
962                 in_dev_put(in_dev);
963                 return pim_rcv_v1(skb);
964 #endif
965         case IGMP_DVMRP:
966         case IGMP_TRACE:
967         case IGMP_HOST_LEAVE_MESSAGE:
968         case IGMP_MTRACE:
969         case IGMP_MTRACE_RESP:
970                 break;
971         default:
972                 break;
973         }
974
975 drop:
976         in_dev_put(in_dev);
977         kfree_skb(skb);
978         return 0;
979 }
980
981 #endif
982
983
984 /*
985  *      Add a filter to a device
986  */
987
988 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
989 {
990         char buf[MAX_ADDR_LEN];
991         struct net_device *dev = in_dev->dev;
992
993         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
994            We will get multicast token leakage, when IFF_MULTICAST
995            is changed. This check should be done in dev->set_multicast_list
996            routine. Something sort of:
997            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
998            --ANK
999            */
1000         if (arp_mc_map(addr, buf, dev, 0) == 0)
1001                 dev_mc_add(dev,buf,dev->addr_len,0);
1002 }
1003
1004 /*
1005  *      Remove a filter from a device
1006  */
1007
1008 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1009 {
1010         char buf[MAX_ADDR_LEN];
1011         struct net_device *dev = in_dev->dev;
1012
1013         if (arp_mc_map(addr, buf, dev, 0) == 0)
1014                 dev_mc_delete(dev,buf,dev->addr_len,0);
1015 }
1016
1017 #ifdef CONFIG_IP_MULTICAST
1018 /*
1019  * deleted ip_mc_list manipulation
1020  */
1021 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1022 {
1023         struct ip_mc_list *pmc;
1024
1025         /* this is an "ip_mc_list" for convenience; only the fields below
1026          * are actually used. In particular, the refcnt and users are not
1027          * used for management of the delete list. Using the same structure
1028          * for deleted items allows change reports to use common code with
1029          * non-deleted or query-response MCA's.
1030          */
1031         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1032         if (!pmc)
1033                 return;
1034         spin_lock_bh(&im->lock);
1035         pmc->interface = im->interface;
1036         in_dev_hold(in_dev);
1037         pmc->multiaddr = im->multiaddr;
1038         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1039                 IGMP_Unsolicited_Report_Count;
1040         pmc->sfmode = im->sfmode;
1041         if (pmc->sfmode == MCAST_INCLUDE) {
1042                 struct ip_sf_list *psf;
1043
1044                 pmc->tomb = im->tomb;
1045                 pmc->sources = im->sources;
1046                 im->tomb = im->sources = NULL;
1047                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1048                         psf->sf_crcount = pmc->crcount;
1049         }
1050         spin_unlock_bh(&im->lock);
1051
1052         spin_lock_bh(&in_dev->mc_tomb_lock);
1053         pmc->next = in_dev->mc_tomb;
1054         in_dev->mc_tomb = pmc;
1055         spin_unlock_bh(&in_dev->mc_tomb_lock);
1056 }
1057
1058 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1059 {
1060         struct ip_mc_list *pmc, *pmc_prev;
1061         struct ip_sf_list *psf, *psf_next;
1062
1063         spin_lock_bh(&in_dev->mc_tomb_lock);
1064         pmc_prev = NULL;
1065         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1066                 if (pmc->multiaddr == multiaddr)
1067                         break;
1068                 pmc_prev = pmc;
1069         }
1070         if (pmc) {
1071                 if (pmc_prev)
1072                         pmc_prev->next = pmc->next;
1073                 else
1074                         in_dev->mc_tomb = pmc->next;
1075         }
1076         spin_unlock_bh(&in_dev->mc_tomb_lock);
1077         if (pmc) {
1078                 for (psf=pmc->tomb; psf; psf=psf_next) {
1079                         psf_next = psf->sf_next;
1080                         kfree(psf);
1081                 }
1082                 in_dev_put(pmc->interface);
1083                 kfree(pmc);
1084         }
1085 }
1086
1087 static void igmpv3_clear_delrec(struct in_device *in_dev)
1088 {
1089         struct ip_mc_list *pmc, *nextpmc;
1090
1091         spin_lock_bh(&in_dev->mc_tomb_lock);
1092         pmc = in_dev->mc_tomb;
1093         in_dev->mc_tomb = NULL;
1094         spin_unlock_bh(&in_dev->mc_tomb_lock);
1095
1096         for (; pmc; pmc = nextpmc) {
1097                 nextpmc = pmc->next;
1098                 ip_mc_clear_src(pmc);
1099                 in_dev_put(pmc->interface);
1100                 kfree(pmc);
1101         }
1102         /* clear dead sources, too */
1103         read_lock(&in_dev->mc_list_lock);
1104         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1105                 struct ip_sf_list *psf, *psf_next;
1106
1107                 spin_lock_bh(&pmc->lock);
1108                 psf = pmc->tomb;
1109                 pmc->tomb = NULL;
1110                 spin_unlock_bh(&pmc->lock);
1111                 for (; psf; psf=psf_next) {
1112                         psf_next = psf->sf_next;
1113                         kfree(psf);
1114                 }
1115         }
1116         read_unlock(&in_dev->mc_list_lock);
1117 }
1118 #endif
1119
1120 static void igmp_group_dropped(struct ip_mc_list *im)
1121 {
1122         struct in_device *in_dev = im->interface;
1123 #ifdef CONFIG_IP_MULTICAST
1124         int reporter;
1125 #endif
1126
1127         if (im->loaded) {
1128                 im->loaded = 0;
1129                 ip_mc_filter_del(in_dev, im->multiaddr);
1130         }
1131
1132 #ifdef CONFIG_IP_MULTICAST
1133         if (im->multiaddr == IGMP_ALL_HOSTS)
1134                 return;
1135
1136         reporter = im->reporter;
1137         igmp_stop_timer(im);
1138
1139         if (!in_dev->dead) {
1140                 if (IGMP_V1_SEEN(in_dev))
1141                         goto done;
1142                 if (IGMP_V2_SEEN(in_dev)) {
1143                         if (reporter)
1144                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1145                         goto done;
1146                 }
1147                 /* IGMPv3 */
1148                 igmpv3_add_delrec(in_dev, im);
1149
1150                 igmp_ifc_event(in_dev);
1151         }
1152 done:
1153 #endif
1154         ip_mc_clear_src(im);
1155 }
1156
1157 static void igmp_group_added(struct ip_mc_list *im)
1158 {
1159         struct in_device *in_dev = im->interface;
1160
1161         if (im->loaded == 0) {
1162                 im->loaded = 1;
1163                 ip_mc_filter_add(in_dev, im->multiaddr);
1164         }
1165
1166 #ifdef CONFIG_IP_MULTICAST
1167         if (im->multiaddr == IGMP_ALL_HOSTS)
1168                 return;
1169
1170         if (in_dev->dead)
1171                 return;
1172         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1173                 spin_lock_bh(&im->lock);
1174                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1175                 spin_unlock_bh(&im->lock);
1176                 return;
1177         }
1178         /* else, v3 */
1179
1180         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1181                 IGMP_Unsolicited_Report_Count;
1182         igmp_ifc_event(in_dev);
1183 #endif
1184 }
1185
1186
1187 /*
1188  *      Multicast list managers
1189  */
1190
1191
1192 /*
1193  *      A socket has joined a multicast group on device dev.
1194  */
1195
1196 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1197 {
1198         struct ip_mc_list *im;
1199
1200         ASSERT_RTNL();
1201
1202         for (im=in_dev->mc_list; im; im=im->next) {
1203                 if (im->multiaddr == addr) {
1204                         im->users++;
1205                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1206                         goto out;
1207                 }
1208         }
1209
1210         im = kmalloc(sizeof(*im), GFP_KERNEL);
1211         if (!im)
1212                 goto out;
1213
1214         im->users=1;
1215         im->interface=in_dev;
1216         in_dev_hold(in_dev);
1217         im->multiaddr=addr;
1218         /* initial mode is (EX, empty) */
1219         im->sfmode = MCAST_EXCLUDE;
1220         im->sfcount[MCAST_INCLUDE] = 0;
1221         im->sfcount[MCAST_EXCLUDE] = 1;
1222         im->sources = NULL;
1223         im->tomb = NULL;
1224         im->crcount = 0;
1225         atomic_set(&im->refcnt, 1);
1226         spin_lock_init(&im->lock);
1227 #ifdef CONFIG_IP_MULTICAST
1228         im->tm_running=0;
1229         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1230         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1231         im->reporter = 0;
1232         im->gsquery = 0;
1233 #endif
1234         im->loaded = 0;
1235         write_lock_bh(&in_dev->mc_list_lock);
1236         im->next=in_dev->mc_list;
1237         in_dev->mc_list=im;
1238         write_unlock_bh(&in_dev->mc_list_lock);
1239 #ifdef CONFIG_IP_MULTICAST
1240         igmpv3_del_delrec(in_dev, im->multiaddr);
1241 #endif
1242         igmp_group_added(im);
1243         if (!in_dev->dead)
1244                 ip_rt_multicast_event(in_dev);
1245 out:
1246         return;
1247 }
1248
1249 /*
1250  *      Resend IGMP JOIN report; used for bonding.
1251  */
1252 void ip_mc_rejoin_group(struct ip_mc_list *im)
1253 {
1254 #ifdef CONFIG_IP_MULTICAST
1255         struct in_device *in_dev = im->interface;
1256
1257         if (im->multiaddr == IGMP_ALL_HOSTS)
1258                 return;
1259
1260         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1261                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1262                 return;
1263         }
1264         /* else, v3 */
1265         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1266                 IGMP_Unsolicited_Report_Count;
1267         igmp_ifc_event(in_dev);
1268 #endif
1269 }
1270
1271 /*
1272  *      A socket has left a multicast group on device dev
1273  */
1274
1275 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1276 {
1277         struct ip_mc_list *i, **ip;
1278
1279         ASSERT_RTNL();
1280
1281         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1282                 if (i->multiaddr==addr) {
1283                         if (--i->users == 0) {
1284                                 write_lock_bh(&in_dev->mc_list_lock);
1285                                 *ip = i->next;
1286                                 write_unlock_bh(&in_dev->mc_list_lock);
1287                                 igmp_group_dropped(i);
1288
1289                                 if (!in_dev->dead)
1290                                         ip_rt_multicast_event(in_dev);
1291
1292                                 ip_ma_put(i);
1293                                 return;
1294                         }
1295                         break;
1296                 }
1297         }
1298 }
1299
1300 /* Device going down */
1301
1302 void ip_mc_down(struct in_device *in_dev)
1303 {
1304         struct ip_mc_list *i;
1305
1306         ASSERT_RTNL();
1307
1308         for (i=in_dev->mc_list; i; i=i->next)
1309                 igmp_group_dropped(i);
1310
1311 #ifdef CONFIG_IP_MULTICAST
1312         in_dev->mr_ifc_count = 0;
1313         if (del_timer(&in_dev->mr_ifc_timer))
1314                 __in_dev_put(in_dev);
1315         in_dev->mr_gq_running = 0;
1316         if (del_timer(&in_dev->mr_gq_timer))
1317                 __in_dev_put(in_dev);
1318         igmpv3_clear_delrec(in_dev);
1319 #endif
1320
1321         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1322 }
1323
1324 void ip_mc_init_dev(struct in_device *in_dev)
1325 {
1326         ASSERT_RTNL();
1327
1328         in_dev->mc_tomb = NULL;
1329 #ifdef CONFIG_IP_MULTICAST
1330         in_dev->mr_gq_running = 0;
1331         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1332                         (unsigned long)in_dev);
1333         in_dev->mr_ifc_count = 0;
1334         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1335                         (unsigned long)in_dev);
1336         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1337 #endif
1338
1339         rwlock_init(&in_dev->mc_list_lock);
1340         spin_lock_init(&in_dev->mc_tomb_lock);
1341 }
1342
1343 /* Device going up */
1344
1345 void ip_mc_up(struct in_device *in_dev)
1346 {
1347         struct ip_mc_list *i;
1348
1349         ASSERT_RTNL();
1350
1351         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1352
1353         for (i=in_dev->mc_list; i; i=i->next)
1354                 igmp_group_added(i);
1355 }
1356
1357 /*
1358  *      Device is about to be destroyed: clean up.
1359  */
1360
1361 void ip_mc_destroy_dev(struct in_device *in_dev)
1362 {
1363         struct ip_mc_list *i;
1364
1365         ASSERT_RTNL();
1366
1367         /* Deactivate timers */
1368         ip_mc_down(in_dev);
1369
1370         write_lock_bh(&in_dev->mc_list_lock);
1371         while ((i = in_dev->mc_list) != NULL) {
1372                 in_dev->mc_list = i->next;
1373                 write_unlock_bh(&in_dev->mc_list_lock);
1374
1375                 igmp_group_dropped(i);
1376                 ip_ma_put(i);
1377
1378                 write_lock_bh(&in_dev->mc_list_lock);
1379         }
1380         write_unlock_bh(&in_dev->mc_list_lock);
1381 }
1382
1383 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1384 {
1385         struct flowi fl = { .nl_u = { .ip4_u =
1386                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1387         struct rtable *rt;
1388         struct net_device *dev = NULL;
1389         struct in_device *idev = NULL;
1390
1391         if (imr->imr_ifindex) {
1392                 idev = inetdev_by_index(imr->imr_ifindex);
1393                 if (idev)
1394                         __in_dev_put(idev);
1395                 return idev;
1396         }
1397         if (imr->imr_address.s_addr) {
1398                 dev = ip_dev_find(imr->imr_address.s_addr);
1399                 if (!dev)
1400                         return NULL;
1401                 dev_put(dev);
1402         }
1403
1404         if (!dev && !ip_route_output_key(&rt, &fl)) {
1405                 dev = rt->u.dst.dev;
1406                 ip_rt_put(rt);
1407         }
1408         if (dev) {
1409                 imr->imr_ifindex = dev->ifindex;
1410                 idev = __in_dev_get_rtnl(dev);
1411         }
1412         return idev;
1413 }
1414
1415 /*
1416  *      Join a socket to a group
1417  */
1418 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1419 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1420
1421
1422 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1423         __be32 *psfsrc)
1424 {
1425         struct ip_sf_list *psf, *psf_prev;
1426         int rv = 0;
1427
1428         psf_prev = NULL;
1429         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1430                 if (psf->sf_inaddr == *psfsrc)
1431                         break;
1432                 psf_prev = psf;
1433         }
1434         if (!psf || psf->sf_count[sfmode] == 0) {
1435                 /* source filter not found, or count wrong =>  bug */
1436                 return -ESRCH;
1437         }
1438         psf->sf_count[sfmode]--;
1439         if (psf->sf_count[sfmode] == 0) {
1440                 ip_rt_multicast_event(pmc->interface);
1441         }
1442         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1443 #ifdef CONFIG_IP_MULTICAST
1444                 struct in_device *in_dev = pmc->interface;
1445 #endif
1446
1447                 /* no more filters for this source */
1448                 if (psf_prev)
1449                         psf_prev->sf_next = psf->sf_next;
1450                 else
1451                         pmc->sources = psf->sf_next;
1452 #ifdef CONFIG_IP_MULTICAST
1453                 if (psf->sf_oldin &&
1454                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1455                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1456                                 IGMP_Unsolicited_Report_Count;
1457                         psf->sf_next = pmc->tomb;
1458                         pmc->tomb = psf;
1459                         rv = 1;
1460                 } else
1461 #endif
1462                         kfree(psf);
1463         }
1464         return rv;
1465 }
1466
1467 #ifndef CONFIG_IP_MULTICAST
1468 #define igmp_ifc_event(x)       do { } while (0)
1469 #endif
1470
1471 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1472                          int sfcount, __be32 *psfsrc, int delta)
1473 {
1474         struct ip_mc_list *pmc;
1475         int     changerec = 0;
1476         int     i, err;
1477
1478         if (!in_dev)
1479                 return -ENODEV;
1480         read_lock(&in_dev->mc_list_lock);
1481         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1482                 if (*pmca == pmc->multiaddr)
1483                         break;
1484         }
1485         if (!pmc) {
1486                 /* MCA not found?? bug */
1487                 read_unlock(&in_dev->mc_list_lock);
1488                 return -ESRCH;
1489         }
1490         spin_lock_bh(&pmc->lock);
1491         read_unlock(&in_dev->mc_list_lock);
1492 #ifdef CONFIG_IP_MULTICAST
1493         sf_markstate(pmc);
1494 #endif
1495         if (!delta) {
1496                 err = -EINVAL;
1497                 if (!pmc->sfcount[sfmode])
1498                         goto out_unlock;
1499                 pmc->sfcount[sfmode]--;
1500         }
1501         err = 0;
1502         for (i=0; i<sfcount; i++) {
1503                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1504
1505                 changerec |= rv > 0;
1506                 if (!err && rv < 0)
1507                         err = rv;
1508         }
1509         if (pmc->sfmode == MCAST_EXCLUDE &&
1510             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1511             pmc->sfcount[MCAST_INCLUDE]) {
1512 #ifdef CONFIG_IP_MULTICAST
1513                 struct ip_sf_list *psf;
1514 #endif
1515
1516                 /* filter mode change */
1517                 pmc->sfmode = MCAST_INCLUDE;
1518 #ifdef CONFIG_IP_MULTICAST
1519                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1520                         IGMP_Unsolicited_Report_Count;
1521                 in_dev->mr_ifc_count = pmc->crcount;
1522                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1523                         psf->sf_crcount = 0;
1524                 igmp_ifc_event(pmc->interface);
1525         } else if (sf_setstate(pmc) || changerec) {
1526                 igmp_ifc_event(pmc->interface);
1527 #endif
1528         }
1529 out_unlock:
1530         spin_unlock_bh(&pmc->lock);
1531         return err;
1532 }
1533
1534 /*
1535  * Add multicast single-source filter to the interface list
1536  */
1537 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1538         __be32 *psfsrc, int delta)
1539 {
1540         struct ip_sf_list *psf, *psf_prev;
1541
1542         psf_prev = NULL;
1543         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1544                 if (psf->sf_inaddr == *psfsrc)
1545                         break;
1546                 psf_prev = psf;
1547         }
1548         if (!psf) {
1549                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1550                 if (!psf)
1551                         return -ENOBUFS;
1552                 psf->sf_inaddr = *psfsrc;
1553                 if (psf_prev) {
1554                         psf_prev->sf_next = psf;
1555                 } else
1556                         pmc->sources = psf;
1557         }
1558         psf->sf_count[sfmode]++;
1559         if (psf->sf_count[sfmode] == 1) {
1560                 ip_rt_multicast_event(pmc->interface);
1561         }
1562         return 0;
1563 }
1564
1565 #ifdef CONFIG_IP_MULTICAST
1566 static void sf_markstate(struct ip_mc_list *pmc)
1567 {
1568         struct ip_sf_list *psf;
1569         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1570
1571         for (psf=pmc->sources; psf; psf=psf->sf_next)
1572                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1573                         psf->sf_oldin = mca_xcount ==
1574                                 psf->sf_count[MCAST_EXCLUDE] &&
1575                                 !psf->sf_count[MCAST_INCLUDE];
1576                 } else
1577                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1578 }
1579
1580 static int sf_setstate(struct ip_mc_list *pmc)
1581 {
1582         struct ip_sf_list *psf, *dpsf;
1583         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1584         int qrv = pmc->interface->mr_qrv;
1585         int new_in, rv;
1586
1587         rv = 0;
1588         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1589                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1590                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1591                                 !psf->sf_count[MCAST_INCLUDE];
1592                 } else
1593                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1594                 if (new_in) {
1595                         if (!psf->sf_oldin) {
1596                                 struct ip_sf_list *prev = NULL;
1597
1598                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1599                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1600                                                 break;
1601                                         prev = dpsf;
1602                                 }
1603                                 if (dpsf) {
1604                                         if (prev)
1605                                                 prev->sf_next = dpsf->sf_next;
1606                                         else
1607                                                 pmc->tomb = dpsf->sf_next;
1608                                         kfree(dpsf);
1609                                 }
1610                                 psf->sf_crcount = qrv;
1611                                 rv++;
1612                         }
1613                 } else if (psf->sf_oldin) {
1614
1615                         psf->sf_crcount = 0;
1616                         /*
1617                          * add or update "delete" records if an active filter
1618                          * is now inactive
1619                          */
1620                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1621                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1622                                         break;
1623                         if (!dpsf) {
1624                                 dpsf = (struct ip_sf_list *)
1625                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1626                                 if (!dpsf)
1627                                         continue;
1628                                 *dpsf = *psf;
1629                                 /* pmc->lock held by callers */
1630                                 dpsf->sf_next = pmc->tomb;
1631                                 pmc->tomb = dpsf;
1632                         }
1633                         dpsf->sf_crcount = qrv;
1634                         rv++;
1635                 }
1636         }
1637         return rv;
1638 }
1639 #endif
1640
1641 /*
1642  * Add multicast source filter list to the interface list
1643  */
1644 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1645                          int sfcount, __be32 *psfsrc, int delta)
1646 {
1647         struct ip_mc_list *pmc;
1648         int     isexclude;
1649         int     i, err;
1650
1651         if (!in_dev)
1652                 return -ENODEV;
1653         read_lock(&in_dev->mc_list_lock);
1654         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1655                 if (*pmca == pmc->multiaddr)
1656                         break;
1657         }
1658         if (!pmc) {
1659                 /* MCA not found?? bug */
1660                 read_unlock(&in_dev->mc_list_lock);
1661                 return -ESRCH;
1662         }
1663         spin_lock_bh(&pmc->lock);
1664         read_unlock(&in_dev->mc_list_lock);
1665
1666 #ifdef CONFIG_IP_MULTICAST
1667         sf_markstate(pmc);
1668 #endif
1669         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1670         if (!delta)
1671                 pmc->sfcount[sfmode]++;
1672         err = 0;
1673         for (i=0; i<sfcount; i++) {
1674                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1675                 if (err)
1676                         break;
1677         }
1678         if (err) {
1679                 int j;
1680
1681                 pmc->sfcount[sfmode]--;
1682                 for (j=0; j<i; j++)
1683                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1684         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1685 #ifdef CONFIG_IP_MULTICAST
1686                 struct ip_sf_list *psf;
1687                 in_dev = pmc->interface;
1688 #endif
1689
1690                 /* filter mode change */
1691                 if (pmc->sfcount[MCAST_EXCLUDE])
1692                         pmc->sfmode = MCAST_EXCLUDE;
1693                 else if (pmc->sfcount[MCAST_INCLUDE])
1694                         pmc->sfmode = MCAST_INCLUDE;
1695 #ifdef CONFIG_IP_MULTICAST
1696                 /* else no filters; keep old mode for reports */
1697
1698                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1699                         IGMP_Unsolicited_Report_Count;
1700                 in_dev->mr_ifc_count = pmc->crcount;
1701                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1702                         psf->sf_crcount = 0;
1703                 igmp_ifc_event(in_dev);
1704         } else if (sf_setstate(pmc)) {
1705                 igmp_ifc_event(in_dev);
1706 #endif
1707         }
1708         spin_unlock_bh(&pmc->lock);
1709         return err;
1710 }
1711
1712 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1713 {
1714         struct ip_sf_list *psf, *nextpsf;
1715
1716         for (psf=pmc->tomb; psf; psf=nextpsf) {
1717                 nextpsf = psf->sf_next;
1718                 kfree(psf);
1719         }
1720         pmc->tomb = NULL;
1721         for (psf=pmc->sources; psf; psf=nextpsf) {
1722                 nextpsf = psf->sf_next;
1723                 kfree(psf);
1724         }
1725         pmc->sources = NULL;
1726         pmc->sfmode = MCAST_EXCLUDE;
1727         pmc->sfcount[MCAST_INCLUDE] = 0;
1728         pmc->sfcount[MCAST_EXCLUDE] = 1;
1729 }
1730
1731
1732 /*
1733  * Join a multicast group
1734  */
1735 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1736 {
1737         int err;
1738         __be32 addr = imr->imr_multiaddr.s_addr;
1739         struct ip_mc_socklist *iml=NULL, *i;
1740         struct in_device *in_dev;
1741         struct inet_sock *inet = inet_sk(sk);
1742         int ifindex;
1743         int count = 0;
1744
1745         if (!MULTICAST(addr))
1746                 return -EINVAL;
1747
1748         rtnl_lock();
1749
1750         in_dev = ip_mc_find_dev(imr);
1751
1752         if (!in_dev) {
1753                 iml = NULL;
1754                 err = -ENODEV;
1755                 goto done;
1756         }
1757
1758         err = -EADDRINUSE;
1759         ifindex = imr->imr_ifindex;
1760         for (i = inet->mc_list; i; i = i->next) {
1761                 if (i->multi.imr_multiaddr.s_addr == addr &&
1762                     i->multi.imr_ifindex == ifindex)
1763                         goto done;
1764                 count++;
1765         }
1766         err = -ENOBUFS;
1767         if (count >= sysctl_igmp_max_memberships)
1768                 goto done;
1769         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1770         if (iml == NULL)
1771                 goto done;
1772
1773         memcpy(&iml->multi, imr, sizeof(*imr));
1774         iml->next = inet->mc_list;
1775         iml->sflist = NULL;
1776         iml->sfmode = MCAST_EXCLUDE;
1777         inet->mc_list = iml;
1778         ip_mc_inc_group(in_dev, addr);
1779         err = 0;
1780 done:
1781         rtnl_unlock();
1782         return err;
1783 }
1784
1785 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1786                            struct in_device *in_dev)
1787 {
1788         int err;
1789
1790         if (iml->sflist == NULL) {
1791                 /* any-source empty exclude case */
1792                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1793                         iml->sfmode, 0, NULL, 0);
1794         }
1795         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1796                         iml->sfmode, iml->sflist->sl_count,
1797                         iml->sflist->sl_addr, 0);
1798         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1799         iml->sflist = NULL;
1800         return err;
1801 }
1802
1803 /*
1804  *      Ask a socket to leave a group.
1805  */
1806
1807 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1808 {
1809         struct inet_sock *inet = inet_sk(sk);
1810         struct ip_mc_socklist *iml, **imlp;
1811         struct in_device *in_dev;
1812         __be32 group = imr->imr_multiaddr.s_addr;
1813         u32 ifindex;
1814         int ret = -EADDRNOTAVAIL;
1815
1816         rtnl_lock();
1817         in_dev = ip_mc_find_dev(imr);
1818         ifindex = imr->imr_ifindex;
1819         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1820                 if (iml->multi.imr_multiaddr.s_addr != group)
1821                         continue;
1822                 if (ifindex) {
1823                         if (iml->multi.imr_ifindex != ifindex)
1824                                 continue;
1825                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1826                                 iml->multi.imr_address.s_addr)
1827                         continue;
1828
1829                 (void) ip_mc_leave_src(sk, iml, in_dev);
1830
1831                 *imlp = iml->next;
1832
1833                 if (in_dev)
1834                         ip_mc_dec_group(in_dev, group);
1835                 rtnl_unlock();
1836                 sock_kfree_s(sk, iml, sizeof(*iml));
1837                 return 0;
1838         }
1839         if (!in_dev)
1840                 ret = -ENODEV;
1841         rtnl_unlock();
1842         return ret;
1843 }
1844
1845 int ip_mc_source(int add, int omode, struct sock *sk, struct
1846         ip_mreq_source *mreqs, int ifindex)
1847 {
1848         int err;
1849         struct ip_mreqn imr;
1850         __be32 addr = mreqs->imr_multiaddr;
1851         struct ip_mc_socklist *pmc;
1852         struct in_device *in_dev = NULL;
1853         struct inet_sock *inet = inet_sk(sk);
1854         struct ip_sf_socklist *psl;
1855         int leavegroup = 0;
1856         int i, j, rv;
1857
1858         if (!MULTICAST(addr))
1859                 return -EINVAL;
1860
1861         rtnl_lock();
1862
1863         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1864         imr.imr_address.s_addr = mreqs->imr_interface;
1865         imr.imr_ifindex = ifindex;
1866         in_dev = ip_mc_find_dev(&imr);
1867
1868         if (!in_dev) {
1869                 err = -ENODEV;
1870                 goto done;
1871         }
1872         err = -EADDRNOTAVAIL;
1873
1874         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1875                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1876                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1877                         break;
1878         }
1879         if (!pmc) {             /* must have a prior join */
1880                 err = -EINVAL;
1881                 goto done;
1882         }
1883         /* if a source filter was set, must be the same mode as before */
1884         if (pmc->sflist) {
1885                 if (pmc->sfmode != omode) {
1886                         err = -EINVAL;
1887                         goto done;
1888                 }
1889         } else if (pmc->sfmode != omode) {
1890                 /* allow mode switches for empty-set filters */
1891                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1892                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1893                         NULL, 0);
1894                 pmc->sfmode = omode;
1895         }
1896
1897         psl = pmc->sflist;
1898         if (!add) {
1899                 if (!psl)
1900                         goto done;      /* err = -EADDRNOTAVAIL */
1901                 rv = !0;
1902                 for (i=0; i<psl->sl_count; i++) {
1903                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1904                                 sizeof(__be32));
1905                         if (rv == 0)
1906                                 break;
1907                 }
1908                 if (rv)         /* source not found */
1909                         goto done;      /* err = -EADDRNOTAVAIL */
1910
1911                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1912                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1913                         leavegroup = 1;
1914                         goto done;
1915                 }
1916
1917                 /* update the interface filter */
1918                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1919                         &mreqs->imr_sourceaddr, 1);
1920
1921                 for (j=i+1; j<psl->sl_count; j++)
1922                         psl->sl_addr[j-1] = psl->sl_addr[j];
1923                 psl->sl_count--;
1924                 err = 0;
1925                 goto done;
1926         }
1927         /* else, add a new source to the filter */
1928
1929         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1930                 err = -ENOBUFS;
1931                 goto done;
1932         }
1933         if (!psl || psl->sl_count == psl->sl_max) {
1934                 struct ip_sf_socklist *newpsl;
1935                 int count = IP_SFBLOCK;
1936
1937                 if (psl)
1938                         count += psl->sl_max;
1939                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1940                 if (!newpsl) {
1941                         err = -ENOBUFS;
1942                         goto done;
1943                 }
1944                 newpsl->sl_max = count;
1945                 newpsl->sl_count = count - IP_SFBLOCK;
1946                 if (psl) {
1947                         for (i=0; i<psl->sl_count; i++)
1948                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1949                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1950                 }
1951                 pmc->sflist = psl = newpsl;
1952         }
1953         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1954         for (i=0; i<psl->sl_count; i++) {
1955                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1956                         sizeof(__be32));
1957                 if (rv == 0)
1958                         break;
1959         }
1960         if (rv == 0)            /* address already there is an error */
1961                 goto done;
1962         for (j=psl->sl_count-1; j>=i; j--)
1963                 psl->sl_addr[j+1] = psl->sl_addr[j];
1964         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1965         psl->sl_count++;
1966         err = 0;
1967         /* update the interface list */
1968         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1969                 &mreqs->imr_sourceaddr, 1);
1970 done:
1971         rtnl_unlock();
1972         if (leavegroup)
1973                 return ip_mc_leave_group(sk, &imr);
1974         return err;
1975 }
1976
1977 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1978 {
1979         int err = 0;
1980         struct ip_mreqn imr;
1981         __be32 addr = msf->imsf_multiaddr;
1982         struct ip_mc_socklist *pmc;
1983         struct in_device *in_dev;
1984         struct inet_sock *inet = inet_sk(sk);
1985         struct ip_sf_socklist *newpsl, *psl;
1986         int leavegroup = 0;
1987
1988         if (!MULTICAST(addr))
1989                 return -EINVAL;
1990         if (msf->imsf_fmode != MCAST_INCLUDE &&
1991             msf->imsf_fmode != MCAST_EXCLUDE)
1992                 return -EINVAL;
1993
1994         rtnl_lock();
1995
1996         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1997         imr.imr_address.s_addr = msf->imsf_interface;
1998         imr.imr_ifindex = ifindex;
1999         in_dev = ip_mc_find_dev(&imr);
2000
2001         if (!in_dev) {
2002                 err = -ENODEV;
2003                 goto done;
2004         }
2005
2006         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2007         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2008                 leavegroup = 1;
2009                 goto done;
2010         }
2011
2012         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2013                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2014                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2015                         break;
2016         }
2017         if (!pmc) {             /* must have a prior join */
2018                 err = -EINVAL;
2019                 goto done;
2020         }
2021         if (msf->imsf_numsrc) {
2022                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2023                                                            GFP_KERNEL);
2024                 if (!newpsl) {
2025                         err = -ENOBUFS;
2026                         goto done;
2027                 }
2028                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2029                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2030                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2031                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2032                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2033                 if (err) {
2034                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2035                         goto done;
2036                 }
2037         } else {
2038                 newpsl = NULL;
2039                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2040                                      msf->imsf_fmode, 0, NULL, 0);
2041         }
2042         psl = pmc->sflist;
2043         if (psl) {
2044                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2045                         psl->sl_count, psl->sl_addr, 0);
2046                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2047         } else
2048                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2049                         0, NULL, 0);
2050         pmc->sflist = newpsl;
2051         pmc->sfmode = msf->imsf_fmode;
2052         err = 0;
2053 done:
2054         rtnl_unlock();
2055         if (leavegroup)
2056                 err = ip_mc_leave_group(sk, &imr);
2057         return err;
2058 }
2059
2060 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2061         struct ip_msfilter __user *optval, int __user *optlen)
2062 {
2063         int err, len, count, copycount;
2064         struct ip_mreqn imr;
2065         __be32 addr = msf->imsf_multiaddr;
2066         struct ip_mc_socklist *pmc;
2067         struct in_device *in_dev;
2068         struct inet_sock *inet = inet_sk(sk);
2069         struct ip_sf_socklist *psl;
2070
2071         if (!MULTICAST(addr))
2072                 return -EINVAL;
2073
2074         rtnl_lock();
2075
2076         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2077         imr.imr_address.s_addr = msf->imsf_interface;
2078         imr.imr_ifindex = 0;
2079         in_dev = ip_mc_find_dev(&imr);
2080
2081         if (!in_dev) {
2082                 err = -ENODEV;
2083                 goto done;
2084         }
2085         err = -EADDRNOTAVAIL;
2086
2087         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2088                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2089                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2090                         break;
2091         }
2092         if (!pmc)               /* must have a prior join */
2093                 goto done;
2094         msf->imsf_fmode = pmc->sfmode;
2095         psl = pmc->sflist;
2096         rtnl_unlock();
2097         if (!psl) {
2098                 len = 0;
2099                 count = 0;
2100         } else {
2101                 count = psl->sl_count;
2102         }
2103         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2104         len = copycount * sizeof(psl->sl_addr[0]);
2105         msf->imsf_numsrc = count;
2106         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2107             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2108                 return -EFAULT;
2109         }
2110         if (len &&
2111             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2112                 return -EFAULT;
2113         return 0;
2114 done:
2115         rtnl_unlock();
2116         return err;
2117 }
2118
2119 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2120         struct group_filter __user *optval, int __user *optlen)
2121 {
2122         int err, i, count, copycount;
2123         struct sockaddr_in *psin;
2124         __be32 addr;
2125         struct ip_mc_socklist *pmc;
2126         struct inet_sock *inet = inet_sk(sk);
2127         struct ip_sf_socklist *psl;
2128
2129         psin = (struct sockaddr_in *)&gsf->gf_group;
2130         if (psin->sin_family != AF_INET)
2131                 return -EINVAL;
2132         addr = psin->sin_addr.s_addr;
2133         if (!MULTICAST(addr))
2134                 return -EINVAL;
2135
2136         rtnl_lock();
2137
2138         err = -EADDRNOTAVAIL;
2139
2140         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2141                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2142                     pmc->multi.imr_ifindex == gsf->gf_interface)
2143                         break;
2144         }
2145         if (!pmc)               /* must have a prior join */
2146                 goto done;
2147         gsf->gf_fmode = pmc->sfmode;
2148         psl = pmc->sflist;
2149         rtnl_unlock();
2150         count = psl ? psl->sl_count : 0;
2151         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2152         gsf->gf_numsrc = count;
2153         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2154             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2155                 return -EFAULT;
2156         }
2157         for (i=0; i<copycount; i++) {
2158                 struct sockaddr_storage ss;
2159
2160                 psin = (struct sockaddr_in *)&ss;
2161                 memset(&ss, 0, sizeof(ss));
2162                 psin->sin_family = AF_INET;
2163                 psin->sin_addr.s_addr = psl->sl_addr[i];
2164                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2165                         return -EFAULT;
2166         }
2167         return 0;
2168 done:
2169         rtnl_unlock();
2170         return err;
2171 }
2172
2173 /*
2174  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2175  */
2176 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2177 {
2178         struct inet_sock *inet = inet_sk(sk);
2179         struct ip_mc_socklist *pmc;
2180         struct ip_sf_socklist *psl;
2181         int i;
2182
2183         if (!MULTICAST(loc_addr))
2184                 return 1;
2185
2186         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2187                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2188                     pmc->multi.imr_ifindex == dif)
2189                         break;
2190         }
2191         if (!pmc)
2192                 return 1;
2193         psl = pmc->sflist;
2194         if (!psl)
2195                 return pmc->sfmode == MCAST_EXCLUDE;
2196
2197         for (i=0; i<psl->sl_count; i++) {
2198                 if (psl->sl_addr[i] == rmt_addr)
2199                         break;
2200         }
2201         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2202                 return 0;
2203         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2204                 return 0;
2205         return 1;
2206 }
2207
2208 /*
2209  *      A socket is closing.
2210  */
2211
2212 void ip_mc_drop_socket(struct sock *sk)
2213 {
2214         struct inet_sock *inet = inet_sk(sk);
2215         struct ip_mc_socklist *iml;
2216
2217         if (inet->mc_list == NULL)
2218                 return;
2219
2220         rtnl_lock();
2221         while ((iml = inet->mc_list) != NULL) {
2222                 struct in_device *in_dev;
2223                 inet->mc_list = iml->next;
2224
2225                 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
2226                 (void) ip_mc_leave_src(sk, iml, in_dev);
2227                 if (in_dev != NULL) {
2228                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2229                         in_dev_put(in_dev);
2230                 }
2231                 sock_kfree_s(sk, iml, sizeof(*iml));
2232         }
2233         rtnl_unlock();
2234 }
2235
2236 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2237 {
2238         struct ip_mc_list *im;
2239         struct ip_sf_list *psf;
2240         int rv = 0;
2241
2242         read_lock(&in_dev->mc_list_lock);
2243         for (im=in_dev->mc_list; im; im=im->next) {
2244                 if (im->multiaddr == mc_addr)
2245                         break;
2246         }
2247         if (im && proto == IPPROTO_IGMP) {
2248                 rv = 1;
2249         } else if (im) {
2250                 if (src_addr) {
2251                         for (psf=im->sources; psf; psf=psf->sf_next) {
2252                                 if (psf->sf_inaddr == src_addr)
2253                                         break;
2254                         }
2255                         if (psf)
2256                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2257                                         psf->sf_count[MCAST_EXCLUDE] !=
2258                                         im->sfcount[MCAST_EXCLUDE];
2259                         else
2260                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2261                 } else
2262                         rv = 1; /* unspecified source; tentatively allow */
2263         }
2264         read_unlock(&in_dev->mc_list_lock);
2265         return rv;
2266 }
2267
2268 #if defined(CONFIG_PROC_FS)
2269 struct igmp_mc_iter_state {
2270         struct net_device *dev;
2271         struct in_device *in_dev;
2272 };
2273
2274 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2275
2276 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2277 {
2278         struct ip_mc_list *im = NULL;
2279         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2280
2281         state->in_dev = NULL;
2282         for_each_netdev(&init_net, state->dev) {
2283                 struct in_device *in_dev;
2284                 in_dev = in_dev_get(state->dev);
2285                 if (!in_dev)
2286                         continue;
2287                 read_lock(&in_dev->mc_list_lock);
2288                 im = in_dev->mc_list;
2289                 if (im) {
2290                         state->in_dev = in_dev;
2291                         break;
2292                 }
2293                 read_unlock(&in_dev->mc_list_lock);
2294                 in_dev_put(in_dev);
2295         }
2296         return im;
2297 }
2298
2299 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2300 {
2301         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2302         im = im->next;
2303         while (!im) {
2304                 if (likely(state->in_dev != NULL)) {
2305                         read_unlock(&state->in_dev->mc_list_lock);
2306                         in_dev_put(state->in_dev);
2307                 }
2308                 state->dev = next_net_device(state->dev);
2309                 if (!state->dev) {
2310                         state->in_dev = NULL;
2311                         break;
2312                 }
2313                 state->in_dev = in_dev_get(state->dev);
2314                 if (!state->in_dev)
2315                         continue;
2316                 read_lock(&state->in_dev->mc_list_lock);
2317                 im = state->in_dev->mc_list;
2318         }
2319         return im;
2320 }
2321
2322 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2323 {
2324         struct ip_mc_list *im = igmp_mc_get_first(seq);
2325         if (im)
2326                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2327                         --pos;
2328         return pos ? NULL : im;
2329 }
2330
2331 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2332 {
2333         read_lock(&dev_base_lock);
2334         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2335 }
2336
2337 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2338 {
2339         struct ip_mc_list *im;
2340         if (v == SEQ_START_TOKEN)
2341                 im = igmp_mc_get_first(seq);
2342         else
2343                 im = igmp_mc_get_next(seq, v);
2344         ++*pos;
2345         return im;
2346 }
2347
2348 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2349 {
2350         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2351         if (likely(state->in_dev != NULL)) {
2352                 read_unlock(&state->in_dev->mc_list_lock);
2353                 in_dev_put(state->in_dev);
2354                 state->in_dev = NULL;
2355         }
2356         state->dev = NULL;
2357         read_unlock(&dev_base_lock);
2358 }
2359
2360 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2361 {
2362         if (v == SEQ_START_TOKEN)
2363                 seq_puts(seq,
2364                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2365         else {
2366                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2367                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2368                 char   *querier;
2369 #ifdef CONFIG_IP_MULTICAST
2370                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2371                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2372                           "V3";
2373 #else
2374                 querier = "NONE";
2375 #endif
2376
2377                 if (state->in_dev->mc_list == im) {
2378                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2379                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2380                 }
2381
2382                 seq_printf(seq,
2383                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2384                            im->multiaddr, im->users,
2385                            im->tm_running, im->tm_running ?
2386                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2387                            im->reporter);
2388         }
2389         return 0;
2390 }
2391
2392 static const struct seq_operations igmp_mc_seq_ops = {
2393         .start  =       igmp_mc_seq_start,
2394         .next   =       igmp_mc_seq_next,
2395         .stop   =       igmp_mc_seq_stop,
2396         .show   =       igmp_mc_seq_show,
2397 };
2398
2399 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2400 {
2401         return seq_open_private(file, &igmp_mc_seq_ops,
2402                         sizeof(struct igmp_mc_iter_state));
2403 }
2404
2405 static const struct file_operations igmp_mc_seq_fops = {
2406         .owner          =       THIS_MODULE,
2407         .open           =       igmp_mc_seq_open,
2408         .read           =       seq_read,
2409         .llseek         =       seq_lseek,
2410         .release        =       seq_release_private,
2411 };
2412
2413 struct igmp_mcf_iter_state {
2414         struct net_device *dev;
2415         struct in_device *idev;
2416         struct ip_mc_list *im;
2417 };
2418
2419 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2420
2421 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2422 {
2423         struct ip_sf_list *psf = NULL;
2424         struct ip_mc_list *im = NULL;
2425         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2426
2427         state->idev = NULL;
2428         state->im = NULL;
2429         for_each_netdev(&init_net, state->dev) {
2430                 struct in_device *idev;
2431                 idev = in_dev_get(state->dev);
2432                 if (unlikely(idev == NULL))
2433                         continue;
2434                 read_lock(&idev->mc_list_lock);
2435                 im = idev->mc_list;
2436                 if (likely(im != NULL)) {
2437                         spin_lock_bh(&im->lock);
2438                         psf = im->sources;
2439                         if (likely(psf != NULL)) {
2440                                 state->im = im;
2441                                 state->idev = idev;
2442                                 break;
2443                         }
2444                         spin_unlock_bh(&im->lock);
2445                 }
2446                 read_unlock(&idev->mc_list_lock);
2447                 in_dev_put(idev);
2448         }
2449         return psf;
2450 }
2451
2452 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2453 {
2454         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2455
2456         psf = psf->sf_next;
2457         while (!psf) {
2458                 spin_unlock_bh(&state->im->lock);
2459                 state->im = state->im->next;
2460                 while (!state->im) {
2461                         if (likely(state->idev != NULL)) {
2462                                 read_unlock(&state->idev->mc_list_lock);
2463                                 in_dev_put(state->idev);
2464                         }
2465                         state->dev = next_net_device(state->dev);
2466                         if (!state->dev) {
2467                                 state->idev = NULL;
2468                                 goto out;
2469                         }
2470                         state->idev = in_dev_get(state->dev);
2471                         if (!state->idev)
2472                                 continue;
2473                         read_lock(&state->idev->mc_list_lock);
2474                         state->im = state->idev->mc_list;
2475                 }
2476                 if (!state->im)
2477                         break;
2478                 spin_lock_bh(&state->im->lock);
2479                 psf = state->im->sources;
2480         }
2481 out:
2482         return psf;
2483 }
2484
2485 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2486 {
2487         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2488         if (psf)
2489                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2490                         --pos;
2491         return pos ? NULL : psf;
2492 }
2493
2494 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2495 {
2496         read_lock(&dev_base_lock);
2497         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2498 }
2499
2500 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2501 {
2502         struct ip_sf_list *psf;
2503         if (v == SEQ_START_TOKEN)
2504                 psf = igmp_mcf_get_first(seq);
2505         else
2506                 psf = igmp_mcf_get_next(seq, v);
2507         ++*pos;
2508         return psf;
2509 }
2510
2511 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2512 {
2513         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2514         if (likely(state->im != NULL)) {
2515                 spin_unlock_bh(&state->im->lock);
2516                 state->im = NULL;
2517         }
2518         if (likely(state->idev != NULL)) {
2519                 read_unlock(&state->idev->mc_list_lock);
2520                 in_dev_put(state->idev);
2521                 state->idev = NULL;
2522         }
2523         state->dev = NULL;
2524         read_unlock(&dev_base_lock);
2525 }
2526
2527 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2528 {
2529         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2530         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2531
2532         if (v == SEQ_START_TOKEN) {
2533                 seq_printf(seq,
2534                            "%3s %6s "
2535                            "%10s %10s %6s %6s\n", "Idx",
2536                            "Device", "MCA",
2537                            "SRC", "INC", "EXC");
2538         } else {
2539                 seq_printf(seq,
2540                            "%3d %6.6s 0x%08x "
2541                            "0x%08x %6lu %6lu\n",
2542                            state->dev->ifindex, state->dev->name,
2543                            ntohl(state->im->multiaddr),
2544                            ntohl(psf->sf_inaddr),
2545                            psf->sf_count[MCAST_INCLUDE],
2546                            psf->sf_count[MCAST_EXCLUDE]);
2547         }
2548         return 0;
2549 }
2550
2551 static const struct seq_operations igmp_mcf_seq_ops = {
2552         .start  =       igmp_mcf_seq_start,
2553         .next   =       igmp_mcf_seq_next,
2554         .stop   =       igmp_mcf_seq_stop,
2555         .show   =       igmp_mcf_seq_show,
2556 };
2557
2558 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2559 {
2560         return seq_open_private(file, &igmp_mcf_seq_ops,
2561                         sizeof(struct igmp_mcf_iter_state));
2562 }
2563
2564 static const struct file_operations igmp_mcf_seq_fops = {
2565         .owner          =       THIS_MODULE,
2566         .open           =       igmp_mcf_seq_open,
2567         .read           =       seq_read,
2568         .llseek         =       seq_lseek,
2569         .release        =       seq_release_private,
2570 };
2571
2572 int __init igmp_mc_proc_init(void)
2573 {
2574         proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2575         proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2576         return 0;
2577 }
2578 #endif
2579
2580 EXPORT_SYMBOL(ip_mc_dec_group);
2581 EXPORT_SYMBOL(ip_mc_inc_group);
2582 EXPORT_SYMBOL(ip_mc_join_group);
2583 EXPORT_SYMBOL(ip_mc_rejoin_group);