Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
[linux-2.6.git] / net / ipv4 / igmp.c
1 /*
2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
3  *
4  *      This code implements the IGMP protocol as defined in RFC1112. There has
5  *      been a further revision of this protocol since which is now supported.
6  *
7  *      If you have trouble with this module be careful what gcc you have used,
8  *      the older version didn't come out right using gcc 2.5.8, the newer one
9  *      seems to fall out with gcc 2.6.2.
10  *
11  *      Authors:
12  *              Alan Cox <alan@lxorguk.ukuu.org.uk>
13  *
14  *      This program is free software; you can redistribute it and/or
15  *      modify it under the terms of the GNU General Public License
16  *      as published by the Free Software Foundation; either version
17  *      2 of the License, or (at your option) any later version.
18  *
19  *      Fixes:
20  *
21  *              Alan Cox        :       Added lots of __inline__ to optimise
22  *                                      the memory usage of all the tiny little
23  *                                      functions.
24  *              Alan Cox        :       Dumped the header building experiment.
25  *              Alan Cox        :       Minor tweaks ready for multicast routing
26  *                                      and extended IGMP protocol.
27  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
28  *                                      writes utterly bogus code otherwise (sigh)
29  *                                      fixed IGMP loopback to behave in the manner
30  *                                      desired by mrouted, fixed the fact it has been
31  *                                      broken since 1.3.6 and cleaned up a few minor
32  *                                      points.
33  *
34  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
35  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
36  *                                      The enhancements are mainly based on Steve Deering's
37  *                                      ipmulti-3.5 source code.
38  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
39  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
40  *                                      the mrouted version on that device.
41  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
42  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
43  *                                      to identify the multicast router version
44  *                                      and do what the IGMP version 2 specified.
45  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
46  *              Tsu-Sheng Tsao          if the specified time expired.
47  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
48  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
49  *              Christian Daudt :       igmp timer wasn't set for local group
50  *                                      memberships but was being deleted,
51  *                                      which caused a "del_timer() called
52  *                                      from %p with timer not initialized\n"
53  *                                      message (960131).
54  *              Christian Daudt :       removed del_timer from
55  *                                      igmp_timer_expire function (960205).
56  *             Christian Daudt :       igmp_heard_report now only calls
57  *                                     igmp_timer_expire if tm->running is
58  *                                     true (960216).
59  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
60  *                                      igmp_heard_query never trigger. Expiry
61  *                                      miscalculation fixed in igmp_heard_query
62  *                                      and random() made to return unsigned to
63  *                                      prevent negative expiry times.
64  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
65  *                                      fix from pending 2.1.x patches.
66  *              Alan Cox:               Forget to enable FDDI support earlier.
67  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
68  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
69  *              David L Stevens:        IGMPv3 support, with help from
70  *                                      Vinay Kulkarni
71  */
72
73 #include <linux/module.h>
74 #include <linux/slab.h>
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/types.h>
78 #include <linux/kernel.h>
79 #include <linux/jiffies.h>
80 #include <linux/string.h>
81 #include <linux/socket.h>
82 #include <linux/sockios.h>
83 #include <linux/in.h>
84 #include <linux/inet.h>
85 #include <linux/netdevice.h>
86 #include <linux/skbuff.h>
87 #include <linux/inetdevice.h>
88 #include <linux/igmp.h>
89 #include <linux/if_arp.h>
90 #include <linux/rtnetlink.h>
91 #include <linux/times.h>
92
93 #include <net/net_namespace.h>
94 #include <net/arp.h>
95 #include <net/ip.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
98 #include <net/sock.h>
99 #include <net/checksum.h>
100 #include <linux/netfilter_ipv4.h>
101 #ifdef CONFIG_IP_MROUTE
102 #include <linux/mroute.h>
103 #endif
104 #ifdef CONFIG_PROC_FS
105 #include <linux/proc_fs.h>
106 #include <linux/seq_file.h>
107 #endif
108
109 #define IP_MAX_MEMBERSHIPS      20
110 #define IP_MAX_MSF              10
111
112 #ifdef CONFIG_IP_MULTICAST
113 /* Parameter names and values are taken from igmp-v2-06 draft */
114
115 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
116 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
117 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
118 #define IGMP_Query_Response_Interval            (10*HZ)
119 #define IGMP_Unsolicited_Report_Count           2
120
121
122 #define IGMP_Initial_Report_Delay               (1)
123
124 /* IGMP_Initial_Report_Delay is not from IGMP specs!
125  * IGMP specs require to report membership immediately after
126  * joining a group, but we delay the first report by a
127  * small interval. It seems more natural and still does not
128  * contradict to specs provided this delay is small enough.
129  */
130
131 #define IGMP_V1_SEEN(in_dev) \
132         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
133          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
134          ((in_dev)->mr_v1_seen && \
135           time_before(jiffies, (in_dev)->mr_v1_seen)))
136 #define IGMP_V2_SEEN(in_dev) \
137         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
138          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
139          ((in_dev)->mr_v2_seen && \
140           time_before(jiffies, (in_dev)->mr_v2_seen)))
141
142 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
143 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
144 static void igmpv3_clear_delrec(struct in_device *in_dev);
145 static int sf_setstate(struct ip_mc_list *pmc);
146 static void sf_markstate(struct ip_mc_list *pmc);
147 #endif
148 static void ip_mc_clear_src(struct ip_mc_list *pmc);
149 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
150                          int sfcount, __be32 *psfsrc, int delta);
151
152 static void ip_ma_put(struct ip_mc_list *im)
153 {
154         if (atomic_dec_and_test(&im->refcnt)) {
155                 in_dev_put(im->interface);
156                 kfree(im);
157         }
158 }
159
160 #ifdef CONFIG_IP_MULTICAST
161
162 /*
163  *      Timer management
164  */
165
166 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
167 {
168         spin_lock_bh(&im->lock);
169         if (del_timer(&im->timer))
170                 atomic_dec(&im->refcnt);
171         im->tm_running = 0;
172         im->reporter = 0;
173         im->unsolicit_count = 0;
174         spin_unlock_bh(&im->lock);
175 }
176
177 /* It must be called with locked im->lock */
178 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
179 {
180         int tv = net_random() % max_delay;
181
182         im->tm_running = 1;
183         if (!mod_timer(&im->timer, jiffies+tv+2))
184                 atomic_inc(&im->refcnt);
185 }
186
187 static void igmp_gq_start_timer(struct in_device *in_dev)
188 {
189         int tv = net_random() % in_dev->mr_maxdelay;
190
191         in_dev->mr_gq_running = 1;
192         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
193                 in_dev_hold(in_dev);
194 }
195
196 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
197 {
198         int tv = net_random() % delay;
199
200         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
201                 in_dev_hold(in_dev);
202 }
203
204 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
205 {
206         spin_lock_bh(&im->lock);
207         im->unsolicit_count = 0;
208         if (del_timer(&im->timer)) {
209                 if ((long)(im->timer.expires-jiffies) < max_delay) {
210                         add_timer(&im->timer);
211                         im->tm_running = 1;
212                         spin_unlock_bh(&im->lock);
213                         return;
214                 }
215                 atomic_dec(&im->refcnt);
216         }
217         igmp_start_timer(im, max_delay);
218         spin_unlock_bh(&im->lock);
219 }
220
221
222 /*
223  *      Send an IGMP report.
224  */
225
226 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
227
228
229 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
230         int gdeleted, int sdeleted)
231 {
232         switch (type) {
233         case IGMPV3_MODE_IS_INCLUDE:
234         case IGMPV3_MODE_IS_EXCLUDE:
235                 if (gdeleted || sdeleted)
236                         return 0;
237                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
238                         if (pmc->sfmode == MCAST_INCLUDE)
239                                 return 1;
240                         /* don't include if this source is excluded
241                          * in all filters
242                          */
243                         if (psf->sf_count[MCAST_INCLUDE])
244                                 return type == IGMPV3_MODE_IS_INCLUDE;
245                         return pmc->sfcount[MCAST_EXCLUDE] ==
246                                 psf->sf_count[MCAST_EXCLUDE];
247                 }
248                 return 0;
249         case IGMPV3_CHANGE_TO_INCLUDE:
250                 if (gdeleted || sdeleted)
251                         return 0;
252                 return psf->sf_count[MCAST_INCLUDE] != 0;
253         case IGMPV3_CHANGE_TO_EXCLUDE:
254                 if (gdeleted || sdeleted)
255                         return 0;
256                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
257                     psf->sf_count[MCAST_INCLUDE])
258                         return 0;
259                 return pmc->sfcount[MCAST_EXCLUDE] ==
260                         psf->sf_count[MCAST_EXCLUDE];
261         case IGMPV3_ALLOW_NEW_SOURCES:
262                 if (gdeleted || !psf->sf_crcount)
263                         return 0;
264                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
265         case IGMPV3_BLOCK_OLD_SOURCES:
266                 if (pmc->sfmode == MCAST_INCLUDE)
267                         return gdeleted || (psf->sf_crcount && sdeleted);
268                 return psf->sf_crcount && !gdeleted && !sdeleted;
269         }
270         return 0;
271 }
272
273 static int
274 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
275 {
276         struct ip_sf_list *psf;
277         int scount = 0;
278
279         for (psf=pmc->sources; psf; psf=psf->sf_next) {
280                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
281                         continue;
282                 scount++;
283         }
284         return scount;
285 }
286
287 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
288 {
289         struct sk_buff *skb;
290         struct rtable *rt;
291         struct iphdr *pip;
292         struct igmpv3_report *pig;
293         struct net *net = dev_net(dev);
294
295         skb = alloc_skb(size + LL_ALLOCATED_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(net, &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_set(skb, &rt->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->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         struct net *net = dev_net(dev);
635         __be32  group = pmc ? pmc->multiaddr : 0;
636         __be32  dst;
637
638         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
639                 return igmpv3_send_report(in_dev, pmc);
640         else if (type == IGMP_HOST_LEAVE_MESSAGE)
641                 dst = IGMP_ALL_ROUTER;
642         else
643                 dst = group;
644
645         {
646                 struct flowi fl = { .oif = dev->ifindex,
647                                     .nl_u = { .ip4_u = { .daddr = dst } },
648                                     .proto = IPPROTO_IGMP };
649                 if (ip_route_output_key(net, &rt, &fl))
650                         return -1;
651         }
652         if (rt->rt_src == 0) {
653                 ip_rt_put(rt);
654                 return -1;
655         }
656
657         skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
658         if (skb == NULL) {
659                 ip_rt_put(rt);
660                 return -1;
661         }
662
663         skb_dst_set(skb, &rt->dst);
664
665         skb_reserve(skb, LL_RESERVED_SPACE(dev));
666
667         skb_reset_network_header(skb);
668         iph = ip_hdr(skb);
669         skb_put(skb, sizeof(struct iphdr) + 4);
670
671         iph->version  = 4;
672         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
673         iph->tos      = 0xc0;
674         iph->frag_off = htons(IP_DF);
675         iph->ttl      = 1;
676         iph->daddr    = dst;
677         iph->saddr    = rt->rt_src;
678         iph->protocol = IPPROTO_IGMP;
679         ip_select_ident(iph, &rt->dst, NULL);
680         ((u8*)&iph[1])[0] = IPOPT_RA;
681         ((u8*)&iph[1])[1] = 4;
682         ((u8*)&iph[1])[2] = 0;
683         ((u8*)&iph[1])[3] = 0;
684
685         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
686         ih->type = type;
687         ih->code = 0;
688         ih->csum = 0;
689         ih->group = group;
690         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
691
692         return ip_local_out(skb);
693 }
694
695 static void igmp_gq_timer_expire(unsigned long data)
696 {
697         struct in_device *in_dev = (struct in_device *)data;
698
699         in_dev->mr_gq_running = 0;
700         igmpv3_send_report(in_dev, NULL);
701         __in_dev_put(in_dev);
702 }
703
704 static void igmp_ifc_timer_expire(unsigned long data)
705 {
706         struct in_device *in_dev = (struct in_device *)data;
707
708         igmpv3_send_cr(in_dev);
709         if (in_dev->mr_ifc_count) {
710                 in_dev->mr_ifc_count--;
711                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
712         }
713         __in_dev_put(in_dev);
714 }
715
716 static void igmp_ifc_event(struct in_device *in_dev)
717 {
718         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
719                 return;
720         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
721                 IGMP_Unsolicited_Report_Count;
722         igmp_ifc_start_timer(in_dev, 1);
723 }
724
725
726 static void igmp_timer_expire(unsigned long data)
727 {
728         struct ip_mc_list *im=(struct ip_mc_list *)data;
729         struct in_device *in_dev = im->interface;
730
731         spin_lock(&im->lock);
732         im->tm_running = 0;
733
734         if (im->unsolicit_count) {
735                 im->unsolicit_count--;
736                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
737         }
738         im->reporter = 1;
739         spin_unlock(&im->lock);
740
741         if (IGMP_V1_SEEN(in_dev))
742                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
743         else if (IGMP_V2_SEEN(in_dev))
744                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
745         else
746                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
747
748         ip_ma_put(im);
749 }
750
751 /* mark EXCLUDE-mode sources */
752 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
753 {
754         struct ip_sf_list *psf;
755         int i, scount;
756
757         scount = 0;
758         for (psf=pmc->sources; psf; psf=psf->sf_next) {
759                 if (scount == nsrcs)
760                         break;
761                 for (i=0; i<nsrcs; i++) {
762                         /* skip inactive filters */
763                         if (pmc->sfcount[MCAST_INCLUDE] ||
764                             pmc->sfcount[MCAST_EXCLUDE] !=
765                             psf->sf_count[MCAST_EXCLUDE])
766                                 continue;
767                         if (srcs[i] == psf->sf_inaddr) {
768                                 scount++;
769                                 break;
770                         }
771                 }
772         }
773         pmc->gsquery = 0;
774         if (scount == nsrcs)    /* all sources excluded */
775                 return 0;
776         return 1;
777 }
778
779 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
780 {
781         struct ip_sf_list *psf;
782         int i, scount;
783
784         if (pmc->sfmode == MCAST_EXCLUDE)
785                 return igmp_xmarksources(pmc, nsrcs, srcs);
786
787         /* mark INCLUDE-mode sources */
788         scount = 0;
789         for (psf=pmc->sources; psf; psf=psf->sf_next) {
790                 if (scount == nsrcs)
791                         break;
792                 for (i=0; i<nsrcs; i++)
793                         if (srcs[i] == psf->sf_inaddr) {
794                                 psf->sf_gsresp = 1;
795                                 scount++;
796                                 break;
797                         }
798         }
799         if (!scount) {
800                 pmc->gsquery = 0;
801                 return 0;
802         }
803         pmc->gsquery = 1;
804         return 1;
805 }
806
807 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
808 {
809         struct ip_mc_list *im;
810
811         /* Timers are only set for non-local groups */
812
813         if (group == IGMP_ALL_HOSTS)
814                 return;
815
816         read_lock(&in_dev->mc_list_lock);
817         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
818                 if (im->multiaddr == group) {
819                         igmp_stop_timer(im);
820                         break;
821                 }
822         }
823         read_unlock(&in_dev->mc_list_lock);
824 }
825
826 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
827         int len)
828 {
829         struct igmphdr          *ih = igmp_hdr(skb);
830         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
831         struct ip_mc_list       *im;
832         __be32                  group = ih->group;
833         int                     max_delay;
834         int                     mark = 0;
835
836
837         if (len == 8) {
838                 if (ih->code == 0) {
839                         /* Alas, old v1 router presents here. */
840
841                         max_delay = IGMP_Query_Response_Interval;
842                         in_dev->mr_v1_seen = jiffies +
843                                 IGMP_V1_Router_Present_Timeout;
844                         group = 0;
845                 } else {
846                         /* v2 router present */
847                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
848                         in_dev->mr_v2_seen = jiffies +
849                                 IGMP_V2_Router_Present_Timeout;
850                 }
851                 /* cancel the interface change timer */
852                 in_dev->mr_ifc_count = 0;
853                 if (del_timer(&in_dev->mr_ifc_timer))
854                         __in_dev_put(in_dev);
855                 /* clear deleted report items */
856                 igmpv3_clear_delrec(in_dev);
857         } else if (len < 12) {
858                 return; /* ignore bogus packet; freed by caller */
859         } else if (IGMP_V1_SEEN(in_dev)) {
860                 /* This is a v3 query with v1 queriers present */
861                 max_delay = IGMP_Query_Response_Interval;
862                 group = 0;
863         } else if (IGMP_V2_SEEN(in_dev)) {
864                 /* this is a v3 query with v2 queriers present;
865                  * Interpretation of the max_delay code is problematic here.
866                  * A real v2 host would use ih_code directly, while v3 has a
867                  * different encoding. We use the v3 encoding as more likely
868                  * to be intended in a v3 query.
869                  */
870                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
871         } else { /* v3 */
872                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
873                         return;
874
875                 ih3 = igmpv3_query_hdr(skb);
876                 if (ih3->nsrcs) {
877                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
878                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
879                                 return;
880                         ih3 = igmpv3_query_hdr(skb);
881                 }
882
883                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
884                 if (!max_delay)
885                         max_delay = 1;  /* can't mod w/ 0 */
886                 in_dev->mr_maxdelay = max_delay;
887                 if (ih3->qrv)
888                         in_dev->mr_qrv = ih3->qrv;
889                 if (!group) { /* general query */
890                         if (ih3->nsrcs)
891                                 return; /* no sources allowed */
892                         igmp_gq_start_timer(in_dev);
893                         return;
894                 }
895                 /* mark sources to include, if group & source-specific */
896                 mark = ih3->nsrcs != 0;
897         }
898
899         /*
900          * - Start the timers in all of our membership records
901          *   that the query applies to for the interface on
902          *   which the query arrived excl. those that belong
903          *   to a "local" group (224.0.0.X)
904          * - For timers already running check if they need to
905          *   be reset.
906          * - Use the igmp->igmp_code field as the maximum
907          *   delay possible
908          */
909         read_lock(&in_dev->mc_list_lock);
910         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
911                 int changed;
912
913                 if (group && group != im->multiaddr)
914                         continue;
915                 if (im->multiaddr == IGMP_ALL_HOSTS)
916                         continue;
917                 spin_lock_bh(&im->lock);
918                 if (im->tm_running)
919                         im->gsquery = im->gsquery && mark;
920                 else
921                         im->gsquery = mark;
922                 changed = !im->gsquery ||
923                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
924                 spin_unlock_bh(&im->lock);
925                 if (changed)
926                         igmp_mod_timer(im, max_delay);
927         }
928         read_unlock(&in_dev->mc_list_lock);
929 }
930
931 /* called in rcu_read_lock() section */
932 int igmp_rcv(struct sk_buff *skb)
933 {
934         /* This basically follows the spec line by line -- see RFC1112 */
935         struct igmphdr *ih;
936         struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
937         int len = skb->len;
938
939         if (in_dev == NULL)
940                 goto drop;
941
942         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
943                 goto drop;
944
945         switch (skb->ip_summed) {
946         case CHECKSUM_COMPLETE:
947                 if (!csum_fold(skb->csum))
948                         break;
949                 /* fall through */
950         case CHECKSUM_NONE:
951                 skb->csum = 0;
952                 if (__skb_checksum_complete(skb))
953                         goto drop;
954         }
955
956         ih = igmp_hdr(skb);
957         switch (ih->type) {
958         case IGMP_HOST_MEMBERSHIP_QUERY:
959                 igmp_heard_query(in_dev, skb, len);
960                 break;
961         case IGMP_HOST_MEMBERSHIP_REPORT:
962         case IGMPV2_HOST_MEMBERSHIP_REPORT:
963                 /* Is it our report looped back? */
964                 if (skb_rtable(skb)->fl.iif == 0)
965                         break;
966                 /* don't rely on MC router hearing unicast reports */
967                 if (skb->pkt_type == PACKET_MULTICAST ||
968                     skb->pkt_type == PACKET_BROADCAST)
969                         igmp_heard_report(in_dev, ih->group);
970                 break;
971         case IGMP_PIM:
972 #ifdef CONFIG_IP_PIMSM_V1
973                 return pim_rcv_v1(skb);
974 #endif
975         case IGMPV3_HOST_MEMBERSHIP_REPORT:
976         case IGMP_DVMRP:
977         case IGMP_TRACE:
978         case IGMP_HOST_LEAVE_MESSAGE:
979         case IGMP_MTRACE:
980         case IGMP_MTRACE_RESP:
981                 break;
982         default:
983                 break;
984         }
985
986 drop:
987         kfree_skb(skb);
988         return 0;
989 }
990
991 #endif
992
993
994 /*
995  *      Add a filter to a device
996  */
997
998 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
999 {
1000         char buf[MAX_ADDR_LEN];
1001         struct net_device *dev = in_dev->dev;
1002
1003         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1004            We will get multicast token leakage, when IFF_MULTICAST
1005            is changed. This check should be done in dev->set_multicast_list
1006            routine. Something sort of:
1007            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1008            --ANK
1009            */
1010         if (arp_mc_map(addr, buf, dev, 0) == 0)
1011                 dev_mc_add(dev, buf);
1012 }
1013
1014 /*
1015  *      Remove a filter from a device
1016  */
1017
1018 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1019 {
1020         char buf[MAX_ADDR_LEN];
1021         struct net_device *dev = in_dev->dev;
1022
1023         if (arp_mc_map(addr, buf, dev, 0) == 0)
1024                 dev_mc_del(dev, buf);
1025 }
1026
1027 #ifdef CONFIG_IP_MULTICAST
1028 /*
1029  * deleted ip_mc_list manipulation
1030  */
1031 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1032 {
1033         struct ip_mc_list *pmc;
1034
1035         /* this is an "ip_mc_list" for convenience; only the fields below
1036          * are actually used. In particular, the refcnt and users are not
1037          * used for management of the delete list. Using the same structure
1038          * for deleted items allows change reports to use common code with
1039          * non-deleted or query-response MCA's.
1040          */
1041         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1042         if (!pmc)
1043                 return;
1044         spin_lock_bh(&im->lock);
1045         pmc->interface = im->interface;
1046         in_dev_hold(in_dev);
1047         pmc->multiaddr = im->multiaddr;
1048         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1049                 IGMP_Unsolicited_Report_Count;
1050         pmc->sfmode = im->sfmode;
1051         if (pmc->sfmode == MCAST_INCLUDE) {
1052                 struct ip_sf_list *psf;
1053
1054                 pmc->tomb = im->tomb;
1055                 pmc->sources = im->sources;
1056                 im->tomb = im->sources = NULL;
1057                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1058                         psf->sf_crcount = pmc->crcount;
1059         }
1060         spin_unlock_bh(&im->lock);
1061
1062         spin_lock_bh(&in_dev->mc_tomb_lock);
1063         pmc->next = in_dev->mc_tomb;
1064         in_dev->mc_tomb = pmc;
1065         spin_unlock_bh(&in_dev->mc_tomb_lock);
1066 }
1067
1068 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1069 {
1070         struct ip_mc_list *pmc, *pmc_prev;
1071         struct ip_sf_list *psf, *psf_next;
1072
1073         spin_lock_bh(&in_dev->mc_tomb_lock);
1074         pmc_prev = NULL;
1075         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1076                 if (pmc->multiaddr == multiaddr)
1077                         break;
1078                 pmc_prev = pmc;
1079         }
1080         if (pmc) {
1081                 if (pmc_prev)
1082                         pmc_prev->next = pmc->next;
1083                 else
1084                         in_dev->mc_tomb = pmc->next;
1085         }
1086         spin_unlock_bh(&in_dev->mc_tomb_lock);
1087         if (pmc) {
1088                 for (psf=pmc->tomb; psf; psf=psf_next) {
1089                         psf_next = psf->sf_next;
1090                         kfree(psf);
1091                 }
1092                 in_dev_put(pmc->interface);
1093                 kfree(pmc);
1094         }
1095 }
1096
1097 static void igmpv3_clear_delrec(struct in_device *in_dev)
1098 {
1099         struct ip_mc_list *pmc, *nextpmc;
1100
1101         spin_lock_bh(&in_dev->mc_tomb_lock);
1102         pmc = in_dev->mc_tomb;
1103         in_dev->mc_tomb = NULL;
1104         spin_unlock_bh(&in_dev->mc_tomb_lock);
1105
1106         for (; pmc; pmc = nextpmc) {
1107                 nextpmc = pmc->next;
1108                 ip_mc_clear_src(pmc);
1109                 in_dev_put(pmc->interface);
1110                 kfree(pmc);
1111         }
1112         /* clear dead sources, too */
1113         read_lock(&in_dev->mc_list_lock);
1114         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1115                 struct ip_sf_list *psf, *psf_next;
1116
1117                 spin_lock_bh(&pmc->lock);
1118                 psf = pmc->tomb;
1119                 pmc->tomb = NULL;
1120                 spin_unlock_bh(&pmc->lock);
1121                 for (; psf; psf=psf_next) {
1122                         psf_next = psf->sf_next;
1123                         kfree(psf);
1124                 }
1125         }
1126         read_unlock(&in_dev->mc_list_lock);
1127 }
1128 #endif
1129
1130 static void igmp_group_dropped(struct ip_mc_list *im)
1131 {
1132         struct in_device *in_dev = im->interface;
1133 #ifdef CONFIG_IP_MULTICAST
1134         int reporter;
1135 #endif
1136
1137         if (im->loaded) {
1138                 im->loaded = 0;
1139                 ip_mc_filter_del(in_dev, im->multiaddr);
1140         }
1141
1142 #ifdef CONFIG_IP_MULTICAST
1143         if (im->multiaddr == IGMP_ALL_HOSTS)
1144                 return;
1145
1146         reporter = im->reporter;
1147         igmp_stop_timer(im);
1148
1149         if (!in_dev->dead) {
1150                 if (IGMP_V1_SEEN(in_dev))
1151                         goto done;
1152                 if (IGMP_V2_SEEN(in_dev)) {
1153                         if (reporter)
1154                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1155                         goto done;
1156                 }
1157                 /* IGMPv3 */
1158                 igmpv3_add_delrec(in_dev, im);
1159
1160                 igmp_ifc_event(in_dev);
1161         }
1162 done:
1163 #endif
1164         ip_mc_clear_src(im);
1165 }
1166
1167 static void igmp_group_added(struct ip_mc_list *im)
1168 {
1169         struct in_device *in_dev = im->interface;
1170
1171         if (im->loaded == 0) {
1172                 im->loaded = 1;
1173                 ip_mc_filter_add(in_dev, im->multiaddr);
1174         }
1175
1176 #ifdef CONFIG_IP_MULTICAST
1177         if (im->multiaddr == IGMP_ALL_HOSTS)
1178                 return;
1179
1180         if (in_dev->dead)
1181                 return;
1182         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1183                 spin_lock_bh(&im->lock);
1184                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1185                 spin_unlock_bh(&im->lock);
1186                 return;
1187         }
1188         /* else, v3 */
1189
1190         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1191                 IGMP_Unsolicited_Report_Count;
1192         igmp_ifc_event(in_dev);
1193 #endif
1194 }
1195
1196
1197 /*
1198  *      Multicast list managers
1199  */
1200
1201
1202 /*
1203  *      A socket has joined a multicast group on device dev.
1204  */
1205
1206 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1207 {
1208         struct ip_mc_list *im;
1209
1210         ASSERT_RTNL();
1211
1212         for (im=in_dev->mc_list; im; im=im->next) {
1213                 if (im->multiaddr == addr) {
1214                         im->users++;
1215                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1216                         goto out;
1217                 }
1218         }
1219
1220         im = kmalloc(sizeof(*im), GFP_KERNEL);
1221         if (!im)
1222                 goto out;
1223
1224         im->users = 1;
1225         im->interface = in_dev;
1226         in_dev_hold(in_dev);
1227         im->multiaddr = addr;
1228         /* initial mode is (EX, empty) */
1229         im->sfmode = MCAST_EXCLUDE;
1230         im->sfcount[MCAST_INCLUDE] = 0;
1231         im->sfcount[MCAST_EXCLUDE] = 1;
1232         im->sources = NULL;
1233         im->tomb = NULL;
1234         im->crcount = 0;
1235         atomic_set(&im->refcnt, 1);
1236         spin_lock_init(&im->lock);
1237 #ifdef CONFIG_IP_MULTICAST
1238         im->tm_running = 0;
1239         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1240         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1241         im->reporter = 0;
1242         im->gsquery = 0;
1243 #endif
1244         im->loaded = 0;
1245         write_lock_bh(&in_dev->mc_list_lock);
1246         im->next = in_dev->mc_list;
1247         in_dev->mc_list = im;
1248         in_dev->mc_count++;
1249         write_unlock_bh(&in_dev->mc_list_lock);
1250 #ifdef CONFIG_IP_MULTICAST
1251         igmpv3_del_delrec(in_dev, im->multiaddr);
1252 #endif
1253         igmp_group_added(im);
1254         if (!in_dev->dead)
1255                 ip_rt_multicast_event(in_dev);
1256 out:
1257         return;
1258 }
1259 EXPORT_SYMBOL(ip_mc_inc_group);
1260
1261 /*
1262  *      Resend IGMP JOIN report; used for bonding.
1263  */
1264 void ip_mc_rejoin_group(struct ip_mc_list *im)
1265 {
1266 #ifdef CONFIG_IP_MULTICAST
1267         struct in_device *in_dev = im->interface;
1268
1269         if (im->multiaddr == IGMP_ALL_HOSTS)
1270                 return;
1271
1272         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1273                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1274                 return;
1275         }
1276         /* else, v3 */
1277         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1278                 IGMP_Unsolicited_Report_Count;
1279         igmp_ifc_event(in_dev);
1280 #endif
1281 }
1282 EXPORT_SYMBOL(ip_mc_rejoin_group);
1283
1284 /*
1285  *      A socket has left a multicast group on device dev
1286  */
1287
1288 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1289 {
1290         struct ip_mc_list *i, **ip;
1291
1292         ASSERT_RTNL();
1293
1294         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1295                 if (i->multiaddr == addr) {
1296                         if (--i->users == 0) {
1297                                 write_lock_bh(&in_dev->mc_list_lock);
1298                                 *ip = i->next;
1299                                 in_dev->mc_count--;
1300                                 write_unlock_bh(&in_dev->mc_list_lock);
1301                                 igmp_group_dropped(i);
1302
1303                                 if (!in_dev->dead)
1304                                         ip_rt_multicast_event(in_dev);
1305
1306                                 ip_ma_put(i);
1307                                 return;
1308                         }
1309                         break;
1310                 }
1311         }
1312 }
1313 EXPORT_SYMBOL(ip_mc_dec_group);
1314
1315 /* Device changing type */
1316
1317 void ip_mc_unmap(struct in_device *in_dev)
1318 {
1319         struct ip_mc_list *i;
1320
1321         ASSERT_RTNL();
1322
1323         for (i = in_dev->mc_list; i; i = i->next)
1324                 igmp_group_dropped(i);
1325 }
1326
1327 void ip_mc_remap(struct in_device *in_dev)
1328 {
1329         struct ip_mc_list *i;
1330
1331         ASSERT_RTNL();
1332
1333         for (i = in_dev->mc_list; i; i = i->next)
1334                 igmp_group_added(i);
1335 }
1336
1337 /* Device going down */
1338
1339 void ip_mc_down(struct in_device *in_dev)
1340 {
1341         struct ip_mc_list *i;
1342
1343         ASSERT_RTNL();
1344
1345         for (i=in_dev->mc_list; i; i=i->next)
1346                 igmp_group_dropped(i);
1347
1348 #ifdef CONFIG_IP_MULTICAST
1349         in_dev->mr_ifc_count = 0;
1350         if (del_timer(&in_dev->mr_ifc_timer))
1351                 __in_dev_put(in_dev);
1352         in_dev->mr_gq_running = 0;
1353         if (del_timer(&in_dev->mr_gq_timer))
1354                 __in_dev_put(in_dev);
1355         igmpv3_clear_delrec(in_dev);
1356 #endif
1357
1358         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1359 }
1360
1361 void ip_mc_init_dev(struct in_device *in_dev)
1362 {
1363         ASSERT_RTNL();
1364
1365         in_dev->mc_tomb = NULL;
1366 #ifdef CONFIG_IP_MULTICAST
1367         in_dev->mr_gq_running = 0;
1368         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1369                         (unsigned long)in_dev);
1370         in_dev->mr_ifc_count = 0;
1371         in_dev->mc_count     = 0;
1372         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1373                         (unsigned long)in_dev);
1374         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1375 #endif
1376
1377         rwlock_init(&in_dev->mc_list_lock);
1378         spin_lock_init(&in_dev->mc_tomb_lock);
1379 }
1380
1381 /* Device going up */
1382
1383 void ip_mc_up(struct in_device *in_dev)
1384 {
1385         struct ip_mc_list *i;
1386
1387         ASSERT_RTNL();
1388
1389         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1390
1391         for (i=in_dev->mc_list; i; i=i->next)
1392                 igmp_group_added(i);
1393 }
1394
1395 /*
1396  *      Device is about to be destroyed: clean up.
1397  */
1398
1399 void ip_mc_destroy_dev(struct in_device *in_dev)
1400 {
1401         struct ip_mc_list *i;
1402
1403         ASSERT_RTNL();
1404
1405         /* Deactivate timers */
1406         ip_mc_down(in_dev);
1407
1408         write_lock_bh(&in_dev->mc_list_lock);
1409         while ((i = in_dev->mc_list) != NULL) {
1410                 in_dev->mc_list = i->next;
1411                 in_dev->mc_count--;
1412                 write_unlock_bh(&in_dev->mc_list_lock);
1413                 igmp_group_dropped(i);
1414                 ip_ma_put(i);
1415
1416                 write_lock_bh(&in_dev->mc_list_lock);
1417         }
1418         write_unlock_bh(&in_dev->mc_list_lock);
1419 }
1420
1421 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1422 {
1423         struct flowi fl = { .nl_u = { .ip4_u =
1424                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1425         struct rtable *rt;
1426         struct net_device *dev = NULL;
1427         struct in_device *idev = NULL;
1428
1429         if (imr->imr_ifindex) {
1430                 idev = inetdev_by_index(net, imr->imr_ifindex);
1431                 if (idev)
1432                         __in_dev_put(idev);
1433                 return idev;
1434         }
1435         if (imr->imr_address.s_addr) {
1436                 dev = ip_dev_find(net, imr->imr_address.s_addr);
1437                 if (!dev)
1438                         return NULL;
1439                 dev_put(dev);
1440         }
1441
1442         if (!dev && !ip_route_output_key(net, &rt, &fl)) {
1443                 dev = rt->dst.dev;
1444                 ip_rt_put(rt);
1445         }
1446         if (dev) {
1447                 imr->imr_ifindex = dev->ifindex;
1448                 idev = __in_dev_get_rtnl(dev);
1449         }
1450         return idev;
1451 }
1452
1453 /*
1454  *      Join a socket to a group
1455  */
1456 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1457 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1458
1459
1460 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1461         __be32 *psfsrc)
1462 {
1463         struct ip_sf_list *psf, *psf_prev;
1464         int rv = 0;
1465
1466         psf_prev = NULL;
1467         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1468                 if (psf->sf_inaddr == *psfsrc)
1469                         break;
1470                 psf_prev = psf;
1471         }
1472         if (!psf || psf->sf_count[sfmode] == 0) {
1473                 /* source filter not found, or count wrong =>  bug */
1474                 return -ESRCH;
1475         }
1476         psf->sf_count[sfmode]--;
1477         if (psf->sf_count[sfmode] == 0) {
1478                 ip_rt_multicast_event(pmc->interface);
1479         }
1480         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1481 #ifdef CONFIG_IP_MULTICAST
1482                 struct in_device *in_dev = pmc->interface;
1483 #endif
1484
1485                 /* no more filters for this source */
1486                 if (psf_prev)
1487                         psf_prev->sf_next = psf->sf_next;
1488                 else
1489                         pmc->sources = psf->sf_next;
1490 #ifdef CONFIG_IP_MULTICAST
1491                 if (psf->sf_oldin &&
1492                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1493                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1494                                 IGMP_Unsolicited_Report_Count;
1495                         psf->sf_next = pmc->tomb;
1496                         pmc->tomb = psf;
1497                         rv = 1;
1498                 } else
1499 #endif
1500                         kfree(psf);
1501         }
1502         return rv;
1503 }
1504
1505 #ifndef CONFIG_IP_MULTICAST
1506 #define igmp_ifc_event(x)       do { } while (0)
1507 #endif
1508
1509 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1510                          int sfcount, __be32 *psfsrc, int delta)
1511 {
1512         struct ip_mc_list *pmc;
1513         int     changerec = 0;
1514         int     i, err;
1515
1516         if (!in_dev)
1517                 return -ENODEV;
1518         read_lock(&in_dev->mc_list_lock);
1519         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1520                 if (*pmca == pmc->multiaddr)
1521                         break;
1522         }
1523         if (!pmc) {
1524                 /* MCA not found?? bug */
1525                 read_unlock(&in_dev->mc_list_lock);
1526                 return -ESRCH;
1527         }
1528         spin_lock_bh(&pmc->lock);
1529         read_unlock(&in_dev->mc_list_lock);
1530 #ifdef CONFIG_IP_MULTICAST
1531         sf_markstate(pmc);
1532 #endif
1533         if (!delta) {
1534                 err = -EINVAL;
1535                 if (!pmc->sfcount[sfmode])
1536                         goto out_unlock;
1537                 pmc->sfcount[sfmode]--;
1538         }
1539         err = 0;
1540         for (i=0; i<sfcount; i++) {
1541                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1542
1543                 changerec |= rv > 0;
1544                 if (!err && rv < 0)
1545                         err = rv;
1546         }
1547         if (pmc->sfmode == MCAST_EXCLUDE &&
1548             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1549             pmc->sfcount[MCAST_INCLUDE]) {
1550 #ifdef CONFIG_IP_MULTICAST
1551                 struct ip_sf_list *psf;
1552 #endif
1553
1554                 /* filter mode change */
1555                 pmc->sfmode = MCAST_INCLUDE;
1556 #ifdef CONFIG_IP_MULTICAST
1557                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1558                         IGMP_Unsolicited_Report_Count;
1559                 in_dev->mr_ifc_count = pmc->crcount;
1560                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1561                         psf->sf_crcount = 0;
1562                 igmp_ifc_event(pmc->interface);
1563         } else if (sf_setstate(pmc) || changerec) {
1564                 igmp_ifc_event(pmc->interface);
1565 #endif
1566         }
1567 out_unlock:
1568         spin_unlock_bh(&pmc->lock);
1569         return err;
1570 }
1571
1572 /*
1573  * Add multicast single-source filter to the interface list
1574  */
1575 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1576         __be32 *psfsrc, int delta)
1577 {
1578         struct ip_sf_list *psf, *psf_prev;
1579
1580         psf_prev = NULL;
1581         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1582                 if (psf->sf_inaddr == *psfsrc)
1583                         break;
1584                 psf_prev = psf;
1585         }
1586         if (!psf) {
1587                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1588                 if (!psf)
1589                         return -ENOBUFS;
1590                 psf->sf_inaddr = *psfsrc;
1591                 if (psf_prev) {
1592                         psf_prev->sf_next = psf;
1593                 } else
1594                         pmc->sources = psf;
1595         }
1596         psf->sf_count[sfmode]++;
1597         if (psf->sf_count[sfmode] == 1) {
1598                 ip_rt_multicast_event(pmc->interface);
1599         }
1600         return 0;
1601 }
1602
1603 #ifdef CONFIG_IP_MULTICAST
1604 static void sf_markstate(struct ip_mc_list *pmc)
1605 {
1606         struct ip_sf_list *psf;
1607         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1608
1609         for (psf=pmc->sources; psf; psf=psf->sf_next)
1610                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1611                         psf->sf_oldin = mca_xcount ==
1612                                 psf->sf_count[MCAST_EXCLUDE] &&
1613                                 !psf->sf_count[MCAST_INCLUDE];
1614                 } else
1615                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1616 }
1617
1618 static int sf_setstate(struct ip_mc_list *pmc)
1619 {
1620         struct ip_sf_list *psf, *dpsf;
1621         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1622         int qrv = pmc->interface->mr_qrv;
1623         int new_in, rv;
1624
1625         rv = 0;
1626         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1627                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1628                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1629                                 !psf->sf_count[MCAST_INCLUDE];
1630                 } else
1631                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1632                 if (new_in) {
1633                         if (!psf->sf_oldin) {
1634                                 struct ip_sf_list *prev = NULL;
1635
1636                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1637                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1638                                                 break;
1639                                         prev = dpsf;
1640                                 }
1641                                 if (dpsf) {
1642                                         if (prev)
1643                                                 prev->sf_next = dpsf->sf_next;
1644                                         else
1645                                                 pmc->tomb = dpsf->sf_next;
1646                                         kfree(dpsf);
1647                                 }
1648                                 psf->sf_crcount = qrv;
1649                                 rv++;
1650                         }
1651                 } else if (psf->sf_oldin) {
1652
1653                         psf->sf_crcount = 0;
1654                         /*
1655                          * add or update "delete" records if an active filter
1656                          * is now inactive
1657                          */
1658                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1659                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1660                                         break;
1661                         if (!dpsf) {
1662                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1663                                 if (!dpsf)
1664                                         continue;
1665                                 *dpsf = *psf;
1666                                 /* pmc->lock held by callers */
1667                                 dpsf->sf_next = pmc->tomb;
1668                                 pmc->tomb = dpsf;
1669                         }
1670                         dpsf->sf_crcount = qrv;
1671                         rv++;
1672                 }
1673         }
1674         return rv;
1675 }
1676 #endif
1677
1678 /*
1679  * Add multicast source filter list to the interface list
1680  */
1681 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1682                          int sfcount, __be32 *psfsrc, int delta)
1683 {
1684         struct ip_mc_list *pmc;
1685         int     isexclude;
1686         int     i, err;
1687
1688         if (!in_dev)
1689                 return -ENODEV;
1690         read_lock(&in_dev->mc_list_lock);
1691         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1692                 if (*pmca == pmc->multiaddr)
1693                         break;
1694         }
1695         if (!pmc) {
1696                 /* MCA not found?? bug */
1697                 read_unlock(&in_dev->mc_list_lock);
1698                 return -ESRCH;
1699         }
1700         spin_lock_bh(&pmc->lock);
1701         read_unlock(&in_dev->mc_list_lock);
1702
1703 #ifdef CONFIG_IP_MULTICAST
1704         sf_markstate(pmc);
1705 #endif
1706         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1707         if (!delta)
1708                 pmc->sfcount[sfmode]++;
1709         err = 0;
1710         for (i=0; i<sfcount; i++) {
1711                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1712                 if (err)
1713                         break;
1714         }
1715         if (err) {
1716                 int j;
1717
1718                 pmc->sfcount[sfmode]--;
1719                 for (j=0; j<i; j++)
1720                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1721         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1722 #ifdef CONFIG_IP_MULTICAST
1723                 struct ip_sf_list *psf;
1724                 in_dev = pmc->interface;
1725 #endif
1726
1727                 /* filter mode change */
1728                 if (pmc->sfcount[MCAST_EXCLUDE])
1729                         pmc->sfmode = MCAST_EXCLUDE;
1730                 else if (pmc->sfcount[MCAST_INCLUDE])
1731                         pmc->sfmode = MCAST_INCLUDE;
1732 #ifdef CONFIG_IP_MULTICAST
1733                 /* else no filters; keep old mode for reports */
1734
1735                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1736                         IGMP_Unsolicited_Report_Count;
1737                 in_dev->mr_ifc_count = pmc->crcount;
1738                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1739                         psf->sf_crcount = 0;
1740                 igmp_ifc_event(in_dev);
1741         } else if (sf_setstate(pmc)) {
1742                 igmp_ifc_event(in_dev);
1743 #endif
1744         }
1745         spin_unlock_bh(&pmc->lock);
1746         return err;
1747 }
1748
1749 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1750 {
1751         struct ip_sf_list *psf, *nextpsf;
1752
1753         for (psf=pmc->tomb; psf; psf=nextpsf) {
1754                 nextpsf = psf->sf_next;
1755                 kfree(psf);
1756         }
1757         pmc->tomb = NULL;
1758         for (psf=pmc->sources; psf; psf=nextpsf) {
1759                 nextpsf = psf->sf_next;
1760                 kfree(psf);
1761         }
1762         pmc->sources = NULL;
1763         pmc->sfmode = MCAST_EXCLUDE;
1764         pmc->sfcount[MCAST_INCLUDE] = 0;
1765         pmc->sfcount[MCAST_EXCLUDE] = 1;
1766 }
1767
1768
1769 /*
1770  * Join a multicast group
1771  */
1772 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1773 {
1774         int err;
1775         __be32 addr = imr->imr_multiaddr.s_addr;
1776         struct ip_mc_socklist *iml = NULL, *i;
1777         struct in_device *in_dev;
1778         struct inet_sock *inet = inet_sk(sk);
1779         struct net *net = sock_net(sk);
1780         int ifindex;
1781         int count = 0;
1782
1783         if (!ipv4_is_multicast(addr))
1784                 return -EINVAL;
1785
1786         rtnl_lock();
1787
1788         in_dev = ip_mc_find_dev(net, imr);
1789
1790         if (!in_dev) {
1791                 iml = NULL;
1792                 err = -ENODEV;
1793                 goto done;
1794         }
1795
1796         err = -EADDRINUSE;
1797         ifindex = imr->imr_ifindex;
1798         for (i = inet->mc_list; i; i = i->next) {
1799                 if (i->multi.imr_multiaddr.s_addr == addr &&
1800                     i->multi.imr_ifindex == ifindex)
1801                         goto done;
1802                 count++;
1803         }
1804         err = -ENOBUFS;
1805         if (count >= sysctl_igmp_max_memberships)
1806                 goto done;
1807         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1808         if (iml == NULL)
1809                 goto done;
1810
1811         memcpy(&iml->multi, imr, sizeof(*imr));
1812         iml->next = inet->mc_list;
1813         iml->sflist = NULL;
1814         iml->sfmode = MCAST_EXCLUDE;
1815         rcu_assign_pointer(inet->mc_list, iml);
1816         ip_mc_inc_group(in_dev, addr);
1817         err = 0;
1818 done:
1819         rtnl_unlock();
1820         return err;
1821 }
1822 EXPORT_SYMBOL(ip_mc_join_group);
1823
1824 static void ip_sf_socklist_reclaim(struct rcu_head *rp)
1825 {
1826         struct ip_sf_socklist *psf;
1827
1828         psf = container_of(rp, struct ip_sf_socklist, rcu);
1829         /* sk_omem_alloc should have been decreased by the caller*/
1830         kfree(psf);
1831 }
1832
1833 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1834                            struct in_device *in_dev)
1835 {
1836         struct ip_sf_socklist *psf = iml->sflist;
1837         int err;
1838
1839         if (psf == NULL) {
1840                 /* any-source empty exclude case */
1841                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1842                         iml->sfmode, 0, NULL, 0);
1843         }
1844         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1845                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1846         rcu_assign_pointer(iml->sflist, NULL);
1847         /* decrease mem now to avoid the memleak warning */
1848         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1849         call_rcu(&psf->rcu, ip_sf_socklist_reclaim);
1850         return err;
1851 }
1852
1853
1854 static void ip_mc_socklist_reclaim(struct rcu_head *rp)
1855 {
1856         struct ip_mc_socklist *iml;
1857
1858         iml = container_of(rp, struct ip_mc_socklist, rcu);
1859         /* sk_omem_alloc should have been decreased by the caller*/
1860         kfree(iml);
1861 }
1862
1863
1864 /*
1865  *      Ask a socket to leave a group.
1866  */
1867
1868 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1869 {
1870         struct inet_sock *inet = inet_sk(sk);
1871         struct ip_mc_socklist *iml, **imlp;
1872         struct in_device *in_dev;
1873         struct net *net = sock_net(sk);
1874         __be32 group = imr->imr_multiaddr.s_addr;
1875         u32 ifindex;
1876         int ret = -EADDRNOTAVAIL;
1877
1878         rtnl_lock();
1879         in_dev = ip_mc_find_dev(net, imr);
1880         ifindex = imr->imr_ifindex;
1881         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1882                 if (iml->multi.imr_multiaddr.s_addr != group)
1883                         continue;
1884                 if (ifindex) {
1885                         if (iml->multi.imr_ifindex != ifindex)
1886                                 continue;
1887                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1888                                 iml->multi.imr_address.s_addr)
1889                         continue;
1890
1891                 (void) ip_mc_leave_src(sk, iml, in_dev);
1892
1893                 rcu_assign_pointer(*imlp, iml->next);
1894
1895                 if (in_dev)
1896                         ip_mc_dec_group(in_dev, group);
1897                 rtnl_unlock();
1898                 /* decrease mem now to avoid the memleak warning */
1899                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1900                 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
1901                 return 0;
1902         }
1903         if (!in_dev)
1904                 ret = -ENODEV;
1905         rtnl_unlock();
1906         return ret;
1907 }
1908
1909 int ip_mc_source(int add, int omode, struct sock *sk, struct
1910         ip_mreq_source *mreqs, int ifindex)
1911 {
1912         int err;
1913         struct ip_mreqn imr;
1914         __be32 addr = mreqs->imr_multiaddr;
1915         struct ip_mc_socklist *pmc;
1916         struct in_device *in_dev = NULL;
1917         struct inet_sock *inet = inet_sk(sk);
1918         struct ip_sf_socklist *psl;
1919         struct net *net = sock_net(sk);
1920         int leavegroup = 0;
1921         int i, j, rv;
1922
1923         if (!ipv4_is_multicast(addr))
1924                 return -EINVAL;
1925
1926         rtnl_lock();
1927
1928         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1929         imr.imr_address.s_addr = mreqs->imr_interface;
1930         imr.imr_ifindex = ifindex;
1931         in_dev = ip_mc_find_dev(net, &imr);
1932
1933         if (!in_dev) {
1934                 err = -ENODEV;
1935                 goto done;
1936         }
1937         err = -EADDRNOTAVAIL;
1938
1939         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1940                 if ((pmc->multi.imr_multiaddr.s_addr ==
1941                      imr.imr_multiaddr.s_addr) &&
1942                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
1943                         break;
1944         }
1945         if (!pmc) {             /* must have a prior join */
1946                 err = -EINVAL;
1947                 goto done;
1948         }
1949         /* if a source filter was set, must be the same mode as before */
1950         if (pmc->sflist) {
1951                 if (pmc->sfmode != omode) {
1952                         err = -EINVAL;
1953                         goto done;
1954                 }
1955         } else if (pmc->sfmode != omode) {
1956                 /* allow mode switches for empty-set filters */
1957                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1958                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1959                         NULL, 0);
1960                 pmc->sfmode = omode;
1961         }
1962
1963         psl = pmc->sflist;
1964         if (!add) {
1965                 if (!psl)
1966                         goto done;      /* err = -EADDRNOTAVAIL */
1967                 rv = !0;
1968                 for (i=0; i<psl->sl_count; i++) {
1969                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1970                                 sizeof(__be32));
1971                         if (rv == 0)
1972                                 break;
1973                 }
1974                 if (rv)         /* source not found */
1975                         goto done;      /* err = -EADDRNOTAVAIL */
1976
1977                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1978                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1979                         leavegroup = 1;
1980                         goto done;
1981                 }
1982
1983                 /* update the interface filter */
1984                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1985                         &mreqs->imr_sourceaddr, 1);
1986
1987                 for (j=i+1; j<psl->sl_count; j++)
1988                         psl->sl_addr[j-1] = psl->sl_addr[j];
1989                 psl->sl_count--;
1990                 err = 0;
1991                 goto done;
1992         }
1993         /* else, add a new source to the filter */
1994
1995         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1996                 err = -ENOBUFS;
1997                 goto done;
1998         }
1999         if (!psl || psl->sl_count == psl->sl_max) {
2000                 struct ip_sf_socklist *newpsl;
2001                 int count = IP_SFBLOCK;
2002
2003                 if (psl)
2004                         count += psl->sl_max;
2005                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2006                 if (!newpsl) {
2007                         err = -ENOBUFS;
2008                         goto done;
2009                 }
2010                 newpsl->sl_max = count;
2011                 newpsl->sl_count = count - IP_SFBLOCK;
2012                 if (psl) {
2013                         for (i=0; i<psl->sl_count; i++)
2014                                 newpsl->sl_addr[i] = psl->sl_addr[i];
2015                         /* decrease mem now to avoid the memleak warning */
2016                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2017                         call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2018                 }
2019                 rcu_assign_pointer(pmc->sflist, newpsl);
2020                 psl = newpsl;
2021         }
2022         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2023         for (i=0; i<psl->sl_count; i++) {
2024                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2025                         sizeof(__be32));
2026                 if (rv == 0)
2027                         break;
2028         }
2029         if (rv == 0)            /* address already there is an error */
2030                 goto done;
2031         for (j=psl->sl_count-1; j>=i; j--)
2032                 psl->sl_addr[j+1] = psl->sl_addr[j];
2033         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2034         psl->sl_count++;
2035         err = 0;
2036         /* update the interface list */
2037         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2038                 &mreqs->imr_sourceaddr, 1);
2039 done:
2040         rtnl_unlock();
2041         if (leavegroup)
2042                 return ip_mc_leave_group(sk, &imr);
2043         return err;
2044 }
2045
2046 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2047 {
2048         int err = 0;
2049         struct ip_mreqn imr;
2050         __be32 addr = msf->imsf_multiaddr;
2051         struct ip_mc_socklist *pmc;
2052         struct in_device *in_dev;
2053         struct inet_sock *inet = inet_sk(sk);
2054         struct ip_sf_socklist *newpsl, *psl;
2055         struct net *net = sock_net(sk);
2056         int leavegroup = 0;
2057
2058         if (!ipv4_is_multicast(addr))
2059                 return -EINVAL;
2060         if (msf->imsf_fmode != MCAST_INCLUDE &&
2061             msf->imsf_fmode != MCAST_EXCLUDE)
2062                 return -EINVAL;
2063
2064         rtnl_lock();
2065
2066         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2067         imr.imr_address.s_addr = msf->imsf_interface;
2068         imr.imr_ifindex = ifindex;
2069         in_dev = ip_mc_find_dev(net, &imr);
2070
2071         if (!in_dev) {
2072                 err = -ENODEV;
2073                 goto done;
2074         }
2075
2076         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2077         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2078                 leavegroup = 1;
2079                 goto done;
2080         }
2081
2082         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2083                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2084                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2085                         break;
2086         }
2087         if (!pmc) {             /* must have a prior join */
2088                 err = -EINVAL;
2089                 goto done;
2090         }
2091         if (msf->imsf_numsrc) {
2092                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2093                                                            GFP_KERNEL);
2094                 if (!newpsl) {
2095                         err = -ENOBUFS;
2096                         goto done;
2097                 }
2098                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2099                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2100                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2101                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2102                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2103                 if (err) {
2104                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2105                         goto done;
2106                 }
2107         } else {
2108                 newpsl = NULL;
2109                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2110                                      msf->imsf_fmode, 0, NULL, 0);
2111         }
2112         psl = pmc->sflist;
2113         if (psl) {
2114                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2115                         psl->sl_count, psl->sl_addr, 0);
2116                 /* decrease mem now to avoid the memleak warning */
2117                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2118                 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2119         } else
2120                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2121                         0, NULL, 0);
2122         rcu_assign_pointer(pmc->sflist, newpsl);
2123         pmc->sfmode = msf->imsf_fmode;
2124         err = 0;
2125 done:
2126         rtnl_unlock();
2127         if (leavegroup)
2128                 err = ip_mc_leave_group(sk, &imr);
2129         return err;
2130 }
2131
2132 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2133         struct ip_msfilter __user *optval, int __user *optlen)
2134 {
2135         int err, len, count, copycount;
2136         struct ip_mreqn imr;
2137         __be32 addr = msf->imsf_multiaddr;
2138         struct ip_mc_socklist *pmc;
2139         struct in_device *in_dev;
2140         struct inet_sock *inet = inet_sk(sk);
2141         struct ip_sf_socklist *psl;
2142         struct net *net = sock_net(sk);
2143
2144         if (!ipv4_is_multicast(addr))
2145                 return -EINVAL;
2146
2147         rtnl_lock();
2148
2149         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2150         imr.imr_address.s_addr = msf->imsf_interface;
2151         imr.imr_ifindex = 0;
2152         in_dev = ip_mc_find_dev(net, &imr);
2153
2154         if (!in_dev) {
2155                 err = -ENODEV;
2156                 goto done;
2157         }
2158         err = -EADDRNOTAVAIL;
2159
2160         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2161                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2162                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2163                         break;
2164         }
2165         if (!pmc)               /* must have a prior join */
2166                 goto done;
2167         msf->imsf_fmode = pmc->sfmode;
2168         psl = pmc->sflist;
2169         rtnl_unlock();
2170         if (!psl) {
2171                 len = 0;
2172                 count = 0;
2173         } else {
2174                 count = psl->sl_count;
2175         }
2176         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2177         len = copycount * sizeof(psl->sl_addr[0]);
2178         msf->imsf_numsrc = count;
2179         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2180             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2181                 return -EFAULT;
2182         }
2183         if (len &&
2184             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2185                 return -EFAULT;
2186         return 0;
2187 done:
2188         rtnl_unlock();
2189         return err;
2190 }
2191
2192 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2193         struct group_filter __user *optval, int __user *optlen)
2194 {
2195         int err, i, count, copycount;
2196         struct sockaddr_in *psin;
2197         __be32 addr;
2198         struct ip_mc_socklist *pmc;
2199         struct inet_sock *inet = inet_sk(sk);
2200         struct ip_sf_socklist *psl;
2201
2202         psin = (struct sockaddr_in *)&gsf->gf_group;
2203         if (psin->sin_family != AF_INET)
2204                 return -EINVAL;
2205         addr = psin->sin_addr.s_addr;
2206         if (!ipv4_is_multicast(addr))
2207                 return -EINVAL;
2208
2209         rtnl_lock();
2210
2211         err = -EADDRNOTAVAIL;
2212
2213         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2214                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2215                     pmc->multi.imr_ifindex == gsf->gf_interface)
2216                         break;
2217         }
2218         if (!pmc)               /* must have a prior join */
2219                 goto done;
2220         gsf->gf_fmode = pmc->sfmode;
2221         psl = pmc->sflist;
2222         rtnl_unlock();
2223         count = psl ? psl->sl_count : 0;
2224         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2225         gsf->gf_numsrc = count;
2226         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2227             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2228                 return -EFAULT;
2229         }
2230         for (i=0; i<copycount; i++) {
2231                 struct sockaddr_storage ss;
2232
2233                 psin = (struct sockaddr_in *)&ss;
2234                 memset(&ss, 0, sizeof(ss));
2235                 psin->sin_family = AF_INET;
2236                 psin->sin_addr.s_addr = psl->sl_addr[i];
2237                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2238                         return -EFAULT;
2239         }
2240         return 0;
2241 done:
2242         rtnl_unlock();
2243         return err;
2244 }
2245
2246 /*
2247  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2248  */
2249 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2250 {
2251         struct inet_sock *inet = inet_sk(sk);
2252         struct ip_mc_socklist *pmc;
2253         struct ip_sf_socklist *psl;
2254         int i;
2255         int ret;
2256
2257         ret = 1;
2258         if (!ipv4_is_multicast(loc_addr))
2259                 goto out;
2260
2261         rcu_read_lock();
2262         for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) {
2263                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2264                     pmc->multi.imr_ifindex == dif)
2265                         break;
2266         }
2267         ret = inet->mc_all;
2268         if (!pmc)
2269                 goto unlock;
2270         psl = pmc->sflist;
2271         ret = (pmc->sfmode == MCAST_EXCLUDE);
2272         if (!psl)
2273                 goto unlock;
2274
2275         for (i=0; i<psl->sl_count; i++) {
2276                 if (psl->sl_addr[i] == rmt_addr)
2277                         break;
2278         }
2279         ret = 0;
2280         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2281                 goto unlock;
2282         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2283                 goto unlock;
2284         ret = 1;
2285 unlock:
2286         rcu_read_unlock();
2287 out:
2288         return ret;
2289 }
2290
2291 /*
2292  *      A socket is closing.
2293  */
2294
2295 void ip_mc_drop_socket(struct sock *sk)
2296 {
2297         struct inet_sock *inet = inet_sk(sk);
2298         struct ip_mc_socklist *iml;
2299         struct net *net = sock_net(sk);
2300
2301         if (inet->mc_list == NULL)
2302                 return;
2303
2304         rtnl_lock();
2305         while ((iml = inet->mc_list) != NULL) {
2306                 struct in_device *in_dev;
2307                 rcu_assign_pointer(inet->mc_list, iml->next);
2308
2309                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2310                 (void) ip_mc_leave_src(sk, iml, in_dev);
2311                 if (in_dev != NULL) {
2312                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2313                         in_dev_put(in_dev);
2314                 }
2315                 /* decrease mem now to avoid the memleak warning */
2316                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2317                 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
2318         }
2319         rtnl_unlock();
2320 }
2321
2322 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2323 {
2324         struct ip_mc_list *im;
2325         struct ip_sf_list *psf;
2326         int rv = 0;
2327
2328         read_lock(&in_dev->mc_list_lock);
2329         for (im=in_dev->mc_list; im; im=im->next) {
2330                 if (im->multiaddr == mc_addr)
2331                         break;
2332         }
2333         if (im && proto == IPPROTO_IGMP) {
2334                 rv = 1;
2335         } else if (im) {
2336                 if (src_addr) {
2337                         for (psf=im->sources; psf; psf=psf->sf_next) {
2338                                 if (psf->sf_inaddr == src_addr)
2339                                         break;
2340                         }
2341                         if (psf)
2342                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2343                                         psf->sf_count[MCAST_EXCLUDE] !=
2344                                         im->sfcount[MCAST_EXCLUDE];
2345                         else
2346                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2347                 } else
2348                         rv = 1; /* unspecified source; tentatively allow */
2349         }
2350         read_unlock(&in_dev->mc_list_lock);
2351         return rv;
2352 }
2353
2354 #if defined(CONFIG_PROC_FS)
2355 struct igmp_mc_iter_state {
2356         struct seq_net_private p;
2357         struct net_device *dev;
2358         struct in_device *in_dev;
2359 };
2360
2361 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2362
2363 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2364 {
2365         struct net *net = seq_file_net(seq);
2366         struct ip_mc_list *im = NULL;
2367         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2368
2369         state->in_dev = NULL;
2370         for_each_netdev_rcu(net, state->dev) {
2371                 struct in_device *in_dev;
2372
2373                 in_dev = __in_dev_get_rcu(state->dev);
2374                 if (!in_dev)
2375                         continue;
2376                 read_lock(&in_dev->mc_list_lock);
2377                 im = in_dev->mc_list;
2378                 if (im) {
2379                         state->in_dev = in_dev;
2380                         break;
2381                 }
2382                 read_unlock(&in_dev->mc_list_lock);
2383         }
2384         return im;
2385 }
2386
2387 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2388 {
2389         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2390         im = im->next;
2391         while (!im) {
2392                 if (likely(state->in_dev != NULL))
2393                         read_unlock(&state->in_dev->mc_list_lock);
2394
2395                 state->dev = next_net_device_rcu(state->dev);
2396                 if (!state->dev) {
2397                         state->in_dev = NULL;
2398                         break;
2399                 }
2400                 state->in_dev = __in_dev_get_rcu(state->dev);
2401                 if (!state->in_dev)
2402                         continue;
2403                 read_lock(&state->in_dev->mc_list_lock);
2404                 im = state->in_dev->mc_list;
2405         }
2406         return im;
2407 }
2408
2409 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2410 {
2411         struct ip_mc_list *im = igmp_mc_get_first(seq);
2412         if (im)
2413                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2414                         --pos;
2415         return pos ? NULL : im;
2416 }
2417
2418 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2419         __acquires(rcu)
2420 {
2421         rcu_read_lock();
2422         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2423 }
2424
2425 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2426 {
2427         struct ip_mc_list *im;
2428         if (v == SEQ_START_TOKEN)
2429                 im = igmp_mc_get_first(seq);
2430         else
2431                 im = igmp_mc_get_next(seq, v);
2432         ++*pos;
2433         return im;
2434 }
2435
2436 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2437         __releases(rcu)
2438 {
2439         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2440         if (likely(state->in_dev != NULL)) {
2441                 read_unlock(&state->in_dev->mc_list_lock);
2442                 state->in_dev = NULL;
2443         }
2444         state->dev = NULL;
2445         rcu_read_unlock();
2446 }
2447
2448 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2449 {
2450         if (v == SEQ_START_TOKEN)
2451                 seq_puts(seq,
2452                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2453         else {
2454                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2455                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2456                 char   *querier;
2457 #ifdef CONFIG_IP_MULTICAST
2458                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2459                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2460                           "V3";
2461 #else
2462                 querier = "NONE";
2463 #endif
2464
2465                 if (state->in_dev->mc_list == im) {
2466                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2467                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2468                 }
2469
2470                 seq_printf(seq,
2471                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2472                            im->multiaddr, im->users,
2473                            im->tm_running, im->tm_running ?
2474                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2475                            im->reporter);
2476         }
2477         return 0;
2478 }
2479
2480 static const struct seq_operations igmp_mc_seq_ops = {
2481         .start  =       igmp_mc_seq_start,
2482         .next   =       igmp_mc_seq_next,
2483         .stop   =       igmp_mc_seq_stop,
2484         .show   =       igmp_mc_seq_show,
2485 };
2486
2487 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2488 {
2489         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2490                         sizeof(struct igmp_mc_iter_state));
2491 }
2492
2493 static const struct file_operations igmp_mc_seq_fops = {
2494         .owner          =       THIS_MODULE,
2495         .open           =       igmp_mc_seq_open,
2496         .read           =       seq_read,
2497         .llseek         =       seq_lseek,
2498         .release        =       seq_release_net,
2499 };
2500
2501 struct igmp_mcf_iter_state {
2502         struct seq_net_private p;
2503         struct net_device *dev;
2504         struct in_device *idev;
2505         struct ip_mc_list *im;
2506 };
2507
2508 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2509
2510 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2511 {
2512         struct net *net = seq_file_net(seq);
2513         struct ip_sf_list *psf = NULL;
2514         struct ip_mc_list *im = NULL;
2515         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2516
2517         state->idev = NULL;
2518         state->im = NULL;
2519         for_each_netdev_rcu(net, state->dev) {
2520                 struct in_device *idev;
2521                 idev = __in_dev_get_rcu(state->dev);
2522                 if (unlikely(idev == NULL))
2523                         continue;
2524                 read_lock(&idev->mc_list_lock);
2525                 im = idev->mc_list;
2526                 if (likely(im != NULL)) {
2527                         spin_lock_bh(&im->lock);
2528                         psf = im->sources;
2529                         if (likely(psf != NULL)) {
2530                                 state->im = im;
2531                                 state->idev = idev;
2532                                 break;
2533                         }
2534                         spin_unlock_bh(&im->lock);
2535                 }
2536                 read_unlock(&idev->mc_list_lock);
2537         }
2538         return psf;
2539 }
2540
2541 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2542 {
2543         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2544
2545         psf = psf->sf_next;
2546         while (!psf) {
2547                 spin_unlock_bh(&state->im->lock);
2548                 state->im = state->im->next;
2549                 while (!state->im) {
2550                         if (likely(state->idev != NULL))
2551                                 read_unlock(&state->idev->mc_list_lock);
2552
2553                         state->dev = next_net_device_rcu(state->dev);
2554                         if (!state->dev) {
2555                                 state->idev = NULL;
2556                                 goto out;
2557                         }
2558                         state->idev = __in_dev_get_rcu(state->dev);
2559                         if (!state->idev)
2560                                 continue;
2561                         read_lock(&state->idev->mc_list_lock);
2562                         state->im = state->idev->mc_list;
2563                 }
2564                 if (!state->im)
2565                         break;
2566                 spin_lock_bh(&state->im->lock);
2567                 psf = state->im->sources;
2568         }
2569 out:
2570         return psf;
2571 }
2572
2573 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2574 {
2575         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2576         if (psf)
2577                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2578                         --pos;
2579         return pos ? NULL : psf;
2580 }
2581
2582 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2583         __acquires(rcu)
2584 {
2585         rcu_read_lock();
2586         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2587 }
2588
2589 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2590 {
2591         struct ip_sf_list *psf;
2592         if (v == SEQ_START_TOKEN)
2593                 psf = igmp_mcf_get_first(seq);
2594         else
2595                 psf = igmp_mcf_get_next(seq, v);
2596         ++*pos;
2597         return psf;
2598 }
2599
2600 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2601         __releases(rcu)
2602 {
2603         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2604         if (likely(state->im != NULL)) {
2605                 spin_unlock_bh(&state->im->lock);
2606                 state->im = NULL;
2607         }
2608         if (likely(state->idev != NULL)) {
2609                 read_unlock(&state->idev->mc_list_lock);
2610                 state->idev = NULL;
2611         }
2612         state->dev = NULL;
2613         rcu_read_unlock();
2614 }
2615
2616 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2617 {
2618         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2619         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2620
2621         if (v == SEQ_START_TOKEN) {
2622                 seq_printf(seq,
2623                            "%3s %6s "
2624                            "%10s %10s %6s %6s\n", "Idx",
2625                            "Device", "MCA",
2626                            "SRC", "INC", "EXC");
2627         } else {
2628                 seq_printf(seq,
2629                            "%3d %6.6s 0x%08x "
2630                            "0x%08x %6lu %6lu\n",
2631                            state->dev->ifindex, state->dev->name,
2632                            ntohl(state->im->multiaddr),
2633                            ntohl(psf->sf_inaddr),
2634                            psf->sf_count[MCAST_INCLUDE],
2635                            psf->sf_count[MCAST_EXCLUDE]);
2636         }
2637         return 0;
2638 }
2639
2640 static const struct seq_operations igmp_mcf_seq_ops = {
2641         .start  =       igmp_mcf_seq_start,
2642         .next   =       igmp_mcf_seq_next,
2643         .stop   =       igmp_mcf_seq_stop,
2644         .show   =       igmp_mcf_seq_show,
2645 };
2646
2647 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2648 {
2649         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2650                         sizeof(struct igmp_mcf_iter_state));
2651 }
2652
2653 static const struct file_operations igmp_mcf_seq_fops = {
2654         .owner          =       THIS_MODULE,
2655         .open           =       igmp_mcf_seq_open,
2656         .read           =       seq_read,
2657         .llseek         =       seq_lseek,
2658         .release        =       seq_release_net,
2659 };
2660
2661 static int __net_init igmp_net_init(struct net *net)
2662 {
2663         struct proc_dir_entry *pde;
2664
2665         pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2666         if (!pde)
2667                 goto out_igmp;
2668         pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2669         if (!pde)
2670                 goto out_mcfilter;
2671         return 0;
2672
2673 out_mcfilter:
2674         proc_net_remove(net, "igmp");
2675 out_igmp:
2676         return -ENOMEM;
2677 }
2678
2679 static void __net_exit igmp_net_exit(struct net *net)
2680 {
2681         proc_net_remove(net, "mcfilter");
2682         proc_net_remove(net, "igmp");
2683 }
2684
2685 static struct pernet_operations igmp_net_ops = {
2686         .init = igmp_net_init,
2687         .exit = igmp_net_exit,
2688 };
2689
2690 int __init igmp_mc_proc_init(void)
2691 {
2692         return register_pernet_subsys(&igmp_net_ops);
2693 }
2694 #endif