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   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
  12  *
  13  *      Authors:
  14  *              Alan Cox <Alan.Cox@linux.org>
  15  *
  16  *      This program is free software; you can redistribute it and/or
  17  *      modify it under the terms of the GNU General Public License
  18  *      as published by the Free Software Foundation; either version
  19  *      2 of the License, or (at your option) any later version.
  20  *
  21  *      Fixes:
  22  *
  23  *              Alan Cox        :       Added lots of __inline__ to optimise
  24  *                                      the memory usage of all the tiny little
  25  *                                      functions.
  26  *              Alan Cox        :       Dumped the header building experiment.
  27  *              Alan Cox        :       Minor tweaks ready for multicast routing
  28  *                                      and extended IGMP protocol.
  29  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  30  *                                      writes utterly bogus code otherwise (sigh)
  31  *                                      fixed IGMP loopback to behave in the manner
  32  *                                      desired by mrouted, fixed the fact it has been
  33  *                                      broken since 1.3.6 and cleaned up a few minor
  34  *                                      points.
  35  *
  36  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  37  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  38  *                                      The enhancements are mainly based on Steve Deering's
  39  *                                      ipmulti-3.5 source code.
  40  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  41  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  42  *                                      the mrouted version on that device.
  43  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  44  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  45  *                                      to identify the multicast router version
  46  *                                      and do what the IGMP version 2 specified.
  47  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  48  *              Tsu-Sheng Tsao          if the specified time expired.
  49  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  50  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  51  *              Christian Daudt :       igmp timer wasn't set for local group
  52  *                                      memberships but was being deleted,
  53  *                                      which caused a "del_timer() called
  54  *                                      from %p with timer not initialized\n"
  55  *                                      message (960131).
  56  *              Christian Daudt :       removed del_timer from
  57  *                                      igmp_timer_expire function (960205).
  58  *             Christian Daudt :       igmp_heard_report now only calls
  59  *                                     igmp_timer_expire if tm->running is
  60  *                                     true (960216).
  61  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  62  *                                      igmp_heard_query never trigger. Expiry
  63  *                                      miscalculation fixed in igmp_heard_query
  64  *                                      and random() made to return unsigned to
  65  *                                      prevent negative expiry times.
  66  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  67  *                                      fix from pending 2.1.x patches.
  68  *              Alan Cox:               Forget to enable FDDI support earlier.
  69  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  70  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  71  *              David L Stevens:        IGMPv3 support, with help from
  72  *                                      Vinay Kulkarni
  73  */
  74
  75 #include <linux/config.h>
  76 #include <linux/module.h>
  77 #include <asm/uaccess.h>
  78 #include <asm/system.h>
  79 #include <linux/types.h>
  80 #include <linux/kernel.h>
  81 #include <linux/jiffies.h>
  82 #include <linux/string.h>
  83 #include <linux/socket.h>
  84 #include <linux/sockios.h>
  85 #include <linux/in.h>
  86 #include <linux/inet.h>
  87 #include <linux/netdevice.h>
  88 #include <linux/skbuff.h>
  89 #include <linux/inetdevice.h>
  90 #include <linux/igmp.h>
  91 #include <linux/if_arp.h>
  92 #include <linux/rtnetlink.h>
  93 #include <linux/times.h>
  94
  95 #include <net/arp.h>
  96 #include <net/ip.h>
  97 #include <net/protocol.h>
  98 #include <net/route.h>
  99 #include <net/sock.h>
 100 #include <net/checksum.h>
 101 #include <linux/netfilter_ipv4.h>
 102 #ifdef CONFIG_IP_MROUTE
 103 #include <linux/mroute.h>
 104 #endif
 105 #ifdef CONFIG_PROC_FS
 106 #include <linux/proc_fs.h>
 107 #include <linux/seq_file.h>
 108 #endif
 109
 110 #define IP_MAX_MEMBERSHIPS      20
 111 #define IP_MAX_MSF              10
 112
 113 #ifdef CONFIG_IP_MULTICAST
 114 /* Parameter names and values are taken from igmp-v2-06 draft */
 115
 116 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 117 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 118 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 119 #define IGMP_Query_Response_Interval            (10*HZ)
 120 #define IGMP_Unsolicited_Report_Count           2
 121
 122
 123 #define IGMP_Initial_Report_Delay               (1)
 124
 125 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 126  * IGMP specs require to report membership immediately after
 127  * joining a group, but we delay the first report by a
 128  * small interval. It seems more natural and still does not
 129  * contradict to specs provided this delay is small enough.
 130  */
 131
 132 #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \
 133                 (in_dev)->cnf.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) (ipv4_devconf.force_igmp_version == 2 || \
 137                 (in_dev)->cnf.force_igmp_version == 2 || \
 138                 ((in_dev)->mr_v2_seen && \
 139                 time_before(jiffies, (in_dev)->mr_v2_seen)))
 140
 141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 142 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr);
 143 static void igmpv3_clear_delrec(struct in_device *in_dev);
 144 static int sf_setstate(struct ip_mc_list *pmc);
 145 static void sf_markstate(struct ip_mc_list *pmc);
 146 #endif
 147 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 148 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
 149                          int sfcount, __u32 *psfsrc, int delta);
 150
 151 static void ip_ma_put(struct ip_mc_list *im)
 152 {
 153         if (atomic_dec_and_test(&im->refcnt)) {
 154                 in_dev_put(im->interface);
 155                 kfree(im);
 156         }
 157 }
 158
 159 #ifdef CONFIG_IP_MULTICAST
 160
 161 /*
 162  *      Timer management
 163  */
 164
 165 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 166 {
 167         spin_lock_bh(&im->lock);
 168         if (del_timer(&im->timer))
 169                 atomic_dec(&im->refcnt);
 170         im->tm_running=0;
 171         im->reporter = 0;
 172         im->unsolicit_count = 0;
 173         spin_unlock_bh(&im->lock);
 174 }
 175
 176 /* It must be called with locked im->lock */
 177 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 178 {
 179         int tv=net_random() % max_delay;
 180
 181         im->tm_running=1;
 182         if (!mod_timer(&im->timer, jiffies+tv+2))
 183                 atomic_inc(&im->refcnt);
 184 }
 185
 186 static void igmp_gq_start_timer(struct in_device *in_dev)
 187 {
 188         int tv = net_random() % in_dev->mr_maxdelay;
 189
 190         in_dev->mr_gq_running = 1;
 191         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 192                 in_dev_hold(in_dev);
 193 }
 194
 195 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 196 {
 197         int tv = net_random() % delay;
 198
 199         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 200                 in_dev_hold(in_dev);
 201 }
 202
 203 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 204 {
 205         spin_lock_bh(&im->lock);
 206         im->unsolicit_count = 0;
 207         if (del_timer(&im->timer)) {
 208                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 209                         add_timer(&im->timer);
 210                         im->tm_running=1;
 211                         spin_unlock_bh(&im->lock);
 212                         return;
 213                 }
 214                 atomic_dec(&im->refcnt);
 215         }
 216         igmp_start_timer(im, max_delay);
 217         spin_unlock_bh(&im->lock);
 218 }
 219
 220
 221 /*
 222  *      Send an IGMP report.
 223  */
 224
 225 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 226
 227
 228 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 229         int gdeleted, int sdeleted)
 230 {
 231         switch (type) {
 232         case IGMPV3_MODE_IS_INCLUDE:
 233         case IGMPV3_MODE_IS_EXCLUDE:
 234                 if (gdeleted || sdeleted)
 235                         return 0;
 236                 return !(pmc->gsquery && !psf->sf_gsresp);
 237         case IGMPV3_CHANGE_TO_INCLUDE:
 238                 if (gdeleted || sdeleted)
 239                         return 0;
 240                 return psf->sf_count[MCAST_INCLUDE] != 0;
 241         case IGMPV3_CHANGE_TO_EXCLUDE:
 242                 if (gdeleted || sdeleted)
 243                         return 0;
 244                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 245                     psf->sf_count[MCAST_INCLUDE])
 246                         return 0;
 247                 return pmc->sfcount[MCAST_EXCLUDE] ==
 248                         psf->sf_count[MCAST_EXCLUDE];
 249         case IGMPV3_ALLOW_NEW_SOURCES:
 250                 if (gdeleted || !psf->sf_crcount)
 251                         return 0;
 252                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 253         case IGMPV3_BLOCK_OLD_SOURCES:
 254                 if (pmc->sfmode == MCAST_INCLUDE)
 255                         return gdeleted || (psf->sf_crcount && sdeleted);
 256                 return psf->sf_crcount && !gdeleted && !sdeleted;
 257         }
 258         return 0;
 259 }
 260
 261 static int
 262 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 263 {
 264         struct ip_sf_list *psf;
 265         int scount = 0;
 266
 267         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 268                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 269                         continue;
 270                 scount++;
 271         }
 272         return scount;
 273 }
 274
 275 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 276 {
 277         struct sk_buff *skb;
 278         struct rtable *rt;
 279         struct iphdr *pip;
 280         struct igmpv3_report *pig;
 281
 282         skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 283         if (skb == NULL)
 284                 return NULL;
 285
 286         {
 287                 struct flowi fl = { .oif = dev->ifindex,
 288                                     .nl_u = { .ip4_u = {
 289                                     .daddr = IGMPV3_ALL_MCR } },
 290                                     .proto = IPPROTO_IGMP };
 291                 if (ip_route_output_key(&rt, &fl)) {
 292                         kfree_skb(skb);
 293                         return NULL;
 294                 }
 295         }
 296         if (rt->rt_src == 0) {
 297                 kfree_skb(skb);
 298                 ip_rt_put(rt);
 299                 return NULL;
 300         }
 301
 302         skb->dst = &rt->u.dst;
 303         skb->dev = dev;
 304
 305         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 306
 307         skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
 308
 309         pip->version  = 4;
 310         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 311         pip->tos      = 0xc0;
 312         pip->frag_off = htons(IP_DF);
 313         pip->ttl      = 1;
 314         pip->daddr    = rt->rt_dst;
 315         pip->saddr    = rt->rt_src;
 316         pip->protocol = IPPROTO_IGMP;
 317         pip->tot_len  = 0;      /* filled in later */
 318         ip_select_ident(pip, &rt->u.dst, NULL);
 319         ((u8*)&pip[1])[0] = IPOPT_RA;
 320         ((u8*)&pip[1])[1] = 4;
 321         ((u8*)&pip[1])[2] = 0;
 322         ((u8*)&pip[1])[3] = 0;
 323
 324         pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig));
 325         skb->h.igmph = (struct igmphdr *)pig;
 326         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 327         pig->resv1 = 0;
 328         pig->csum = 0;
 329         pig->resv2 = 0;
 330         pig->ngrec = 0;
 331         return skb;
 332 }
 333
 334 static int igmpv3_sendpack(struct sk_buff *skb)
 335 {
 336         struct iphdr *pip = skb->nh.iph;
 337         struct igmphdr *pig = skb->h.igmph;
 338         int iplen, igmplen;
 339
 340         iplen = skb->tail - (unsigned char *)skb->nh.iph;
 341         pip->tot_len = htons(iplen);
 342         ip_send_check(pip);
 343
 344         igmplen = skb->tail - (unsigned char *)skb->h.igmph;
 345         pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen);
 346
 347         return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
 348                        dst_output);
 349 }
 350
 351 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 352 {
 353         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
 354 }
 355
 356 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 357         int type, struct igmpv3_grec **ppgr)
 358 {
 359         struct net_device *dev = pmc->interface->dev;
 360         struct igmpv3_report *pih;
 361         struct igmpv3_grec *pgr;
 362
 363         if (!skb)
 364                 skb = igmpv3_newpack(dev, dev->mtu);
 365         if (!skb)
 366                 return NULL;
 367         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 368         pgr->grec_type = type;
 369         pgr->grec_auxwords = 0;
 370         pgr->grec_nsrcs = 0;
 371         pgr->grec_mca = pmc->multiaddr;
 372         pih = (struct igmpv3_report *)skb->h.igmph;
 373         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 374         *ppgr = pgr;
 375         return skb;
 376 }
 377
 378 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 379         skb_tailroom(skb)) : 0)
 380
 381 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 382         int type, int gdeleted, int sdeleted)
 383 {
 384         struct net_device *dev = pmc->interface->dev;
 385         struct igmpv3_report *pih;
 386         struct igmpv3_grec *pgr = NULL;
 387         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 388         int scount, first, isquery, truncate;
 389
 390         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 391                 return skb;
 392
 393         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 394                   type == IGMPV3_MODE_IS_EXCLUDE;
 395         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 396                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 397
 398         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 399
 400         if (!*psf_list) {
 401                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 402                     type == IGMPV3_BLOCK_OLD_SOURCES)
 403                         return skb;
 404                 if (pmc->crcount || isquery) {
 405                         /* make sure we have room for group header and at
 406                          * least one source.
 407                          */
 408                         if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)+
 409                             sizeof(__u32)) {
 410                                 igmpv3_sendpack(skb);
 411                                 skb = NULL; /* add_grhead will get a new one */
 412                         }
 413                         skb = add_grhead(skb, pmc, type, &pgr);
 414                 }
 415                 return skb;
 416         }
 417         pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL;
 418
 419         /* EX and TO_EX get a fresh packet, if needed */
 420         if (truncate) {
 421                 if (pih && pih->ngrec &&
 422                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 423                         if (skb)
 424                                 igmpv3_sendpack(skb);
 425                         skb = igmpv3_newpack(dev, dev->mtu);
 426                 }
 427         }
 428         first = 1;
 429         scount = 0;
 430         psf_prev = NULL;
 431         for (psf=*psf_list; psf; psf=psf_next) {
 432                 u32 *psrc;
 433
 434                 psf_next = psf->sf_next;
 435
 436                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 437                         psf_prev = psf;
 438                         continue;
 439                 }
 440
 441                 /* clear marks on query responses */
 442                 if (isquery)
 443                         psf->sf_gsresp = 0;
 444
 445                 if (AVAILABLE(skb) < sizeof(u32) +
 446                     first*sizeof(struct igmpv3_grec)) {
 447                         if (truncate && !first)
 448                                 break;   /* truncate these */
 449                         if (pgr)
 450                                 pgr->grec_nsrcs = htons(scount);
 451                         if (skb)
 452                                 igmpv3_sendpack(skb);
 453                         skb = igmpv3_newpack(dev, dev->mtu);
 454                         first = 1;
 455                         scount = 0;
 456                 }
 457                 if (first) {
 458                         skb = add_grhead(skb, pmc, type, &pgr);
 459                         first = 0;
 460                 }
 461                 psrc = (u32 *)skb_put(skb, sizeof(u32));
 462                 *psrc = psf->sf_inaddr;
 463                 scount++;
 464                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 465                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 466                         psf->sf_crcount--;
 467                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 468                                 if (psf_prev)
 469                                         psf_prev->sf_next = psf->sf_next;
 470                                 else
 471                                         *psf_list = psf->sf_next;
 472                                 kfree(psf);
 473                                 continue;
 474                         }
 475                 }
 476                 psf_prev = psf;
 477         }
 478         if (pgr)
 479                 pgr->grec_nsrcs = htons(scount);
 480
 481         if (isquery)
 482                 pmc->gsquery = 0;       /* clear query state on report */
 483         return skb;
 484 }
 485
 486 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 487 {
 488         struct sk_buff *skb = NULL;
 489         int type;
 490
 491         if (!pmc) {
 492                 read_lock(&in_dev->mc_list_lock);
 493                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 494                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 495                                 continue;
 496                         spin_lock_bh(&pmc->lock);
 497                         if (pmc->sfcount[MCAST_EXCLUDE])
 498                                 type = IGMPV3_MODE_IS_EXCLUDE;
 499                         else
 500                                 type = IGMPV3_MODE_IS_INCLUDE;
 501                         skb = add_grec(skb, pmc, type, 0, 0);
 502                         spin_unlock_bh(&pmc->lock);
 503                 }
 504                 read_unlock(&in_dev->mc_list_lock);
 505         } else {
 506                 spin_lock_bh(&pmc->lock);
 507                 if (pmc->sfcount[MCAST_EXCLUDE])
 508                         type = IGMPV3_MODE_IS_EXCLUDE;
 509                 else
 510                         type = IGMPV3_MODE_IS_INCLUDE;
 511                 skb = add_grec(skb, pmc, type, 0, 0);
 512                 spin_unlock_bh(&pmc->lock);
 513         }
 514         if (!skb)
 515                 return 0;
 516         return igmpv3_sendpack(skb);
 517 }
 518
 519 /*
 520  * remove zero-count source records from a source filter list
 521  */
 522 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 523 {
 524         struct ip_sf_list *psf_prev, *psf_next, *psf;
 525
 526         psf_prev = NULL;
 527         for (psf=*ppsf; psf; psf = psf_next) {
 528                 psf_next = psf->sf_next;
 529                 if (psf->sf_crcount == 0) {
 530                         if (psf_prev)
 531                                 psf_prev->sf_next = psf->sf_next;
 532                         else
 533                                 *ppsf = psf->sf_next;
 534                         kfree(psf);
 535                 } else
 536                         psf_prev = psf;
 537         }
 538 }
 539
 540 static void igmpv3_send_cr(struct in_device *in_dev)
 541 {
 542         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 543         struct sk_buff *skb = NULL;
 544         int type, dtype;
 545
 546         read_lock(&in_dev->mc_list_lock);
 547         spin_lock_bh(&in_dev->mc_tomb_lock);
 548
 549         /* deleted MCA's */
 550         pmc_prev = NULL;
 551         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 552                 pmc_next = pmc->next;
 553                 if (pmc->sfmode == MCAST_INCLUDE) {
 554                         type = IGMPV3_BLOCK_OLD_SOURCES;
 555                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 556                         skb = add_grec(skb, pmc, type, 1, 0);
 557                         skb = add_grec(skb, pmc, dtype, 1, 1);
 558                 }
 559                 if (pmc->crcount) {
 560                         pmc->crcount--;
 561                         if (pmc->sfmode == MCAST_EXCLUDE) {
 562                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 563                                 skb = add_grec(skb, pmc, type, 1, 0);
 564                         }
 565                         if (pmc->crcount == 0) {
 566                                 igmpv3_clear_zeros(&pmc->tomb);
 567                                 igmpv3_clear_zeros(&pmc->sources);
 568                         }
 569                 }
 570                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 571                         if (pmc_prev)
 572                                 pmc_prev->next = pmc_next;
 573                         else
 574                                 in_dev->mc_tomb = pmc_next;
 575                         in_dev_put(pmc->interface);
 576                         kfree(pmc);
 577                 } else
 578                         pmc_prev = pmc;
 579         }
 580         spin_unlock_bh(&in_dev->mc_tomb_lock);
 581
 582         /* change recs */
 583         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 584                 spin_lock_bh(&pmc->lock);
 585                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 586                         type = IGMPV3_BLOCK_OLD_SOURCES;
 587                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 588                 } else {
 589                         type = IGMPV3_ALLOW_NEW_SOURCES;
 590                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 591                 }
 592                 skb = add_grec(skb, pmc, type, 0, 0);
 593                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 594
 595                 /* filter mode changes */
 596                 if (pmc->crcount) {
 597                         pmc->crcount--;
 598                         if (pmc->sfmode == MCAST_EXCLUDE)
 599                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 600                         else
 601                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 602                         skb = add_grec(skb, pmc, type, 0, 0);
 603                 }
 604                 spin_unlock_bh(&pmc->lock);
 605         }
 606         read_unlock(&in_dev->mc_list_lock);
 607
 608         if (!skb)
 609                 return;
 610         (void) igmpv3_sendpack(skb);
 611 }
 612
 613 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 614         int type)
 615 {
 616         struct sk_buff *skb;
 617         struct iphdr *iph;
 618         struct igmphdr *ih;
 619         struct rtable *rt;
 620         struct net_device *dev = in_dev->dev;
 621         u32     group = pmc ? pmc->multiaddr : 0;
 622         u32     dst;
 623
 624         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 625                 return igmpv3_send_report(in_dev, pmc);
 626         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 627                 dst = IGMP_ALL_ROUTER;
 628         else
 629                 dst = group;
 630
 631         {
 632                 struct flowi fl = { .oif = dev->ifindex,
 633                                     .nl_u = { .ip4_u = { .daddr = dst } },
 634                                     .proto = IPPROTO_IGMP };
 635                 if (ip_route_output_key(&rt, &fl))
 636                         return -1;
 637         }
 638         if (rt->rt_src == 0) {
 639                 ip_rt_put(rt);
 640                 return -1;
 641         }
 642
 643         skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 644         if (skb == NULL) {
 645                 ip_rt_put(rt);
 646                 return -1;
 647         }
 648
 649         skb->dst = &rt->u.dst;
 650
 651         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 652
 653         skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
 654
 655         iph->version  = 4;
 656         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 657         iph->tos      = 0xc0;
 658         iph->frag_off = htons(IP_DF);
 659         iph->ttl      = 1;
 660         iph->daddr    = dst;
 661         iph->saddr    = rt->rt_src;
 662         iph->protocol = IPPROTO_IGMP;
 663         iph->tot_len  = htons(IGMP_SIZE);
 664         ip_select_ident(iph, &rt->u.dst, NULL);
 665         ((u8*)&iph[1])[0] = IPOPT_RA;
 666         ((u8*)&iph[1])[1] = 4;
 667         ((u8*)&iph[1])[2] = 0;
 668         ((u8*)&iph[1])[3] = 0;
 669         ip_send_check(iph);
 670
 671         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 672         ih->type=type;
 673         ih->code=0;
 674         ih->csum=0;
 675         ih->group=group;
 676         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 677
 678         return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
 679                        dst_output);
 680 }
 681
 682 static void igmp_gq_timer_expire(unsigned long data)
 683 {
 684         struct in_device *in_dev = (struct in_device *)data;
 685
 686         in_dev->mr_gq_running = 0;
 687         igmpv3_send_report(in_dev, NULL);
 688         __in_dev_put(in_dev);
 689 }
 690
 691 static void igmp_ifc_timer_expire(unsigned long data)
 692 {
 693         struct in_device *in_dev = (struct in_device *)data;
 694
 695         igmpv3_send_cr(in_dev);
 696         if (in_dev->mr_ifc_count) {
 697                 in_dev->mr_ifc_count--;
 698                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 699         }
 700         __in_dev_put(in_dev);
 701 }
 702
 703 static void igmp_ifc_event(struct in_device *in_dev)
 704 {
 705         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 706                 return;
 707         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 708                 IGMP_Unsolicited_Report_Count;
 709         igmp_ifc_start_timer(in_dev, 1);
 710 }
 711
 712
 713 static void igmp_timer_expire(unsigned long data)
 714 {
 715         struct ip_mc_list *im=(struct ip_mc_list *)data;
 716         struct in_device *in_dev = im->interface;
 717
 718         spin_lock(&im->lock);
 719         im->tm_running=0;
 720
 721         if (im->unsolicit_count) {
 722                 im->unsolicit_count--;
 723                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 724         }
 725         im->reporter = 1;
 726         spin_unlock(&im->lock);
 727
 728         if (IGMP_V1_SEEN(in_dev))
 729                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 730         else if (IGMP_V2_SEEN(in_dev))
 731                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 732         else
 733                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 734
 735         ip_ma_put(im);
 736 }
 737
 738 static void igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs)
 739 {
 740         struct ip_sf_list *psf;
 741         int i, scount;
 742
 743         scount = 0;
 744         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 745                 if (scount == nsrcs)
 746                         break;
 747                 for (i=0; i<nsrcs; i++)
 748                         if (srcs[i] == psf->sf_inaddr) {
 749                                 psf->sf_gsresp = 1;
 750                                 scount++;
 751                                 break;
 752                         }
 753         }
 754 }
 755
 756 static void igmp_heard_report(struct in_device *in_dev, u32 group)
 757 {
 758         struct ip_mc_list *im;
 759
 760         /* Timers are only set for non-local groups */
 761
 762         if (group == IGMP_ALL_HOSTS)
 763                 return;
 764
 765         read_lock(&in_dev->mc_list_lock);
 766         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 767                 if (im->multiaddr == group) {
 768                         igmp_stop_timer(im);
 769                         break;
 770                 }
 771         }
 772         read_unlock(&in_dev->mc_list_lock);
 773 }
 774
 775 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 776         int len)
 777 {
 778         struct igmphdr          *ih = skb->h.igmph;
 779         struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
 780         struct ip_mc_list       *im;
 781         u32                     group = ih->group;
 782         int                     max_delay;
 783         int                     mark = 0;
 784
 785
 786         if (len == 8) {
 787                 if (ih->code == 0) {
 788                         /* Alas, old v1 router presents here. */
 789
 790                         max_delay = IGMP_Query_Response_Interval;
 791                         in_dev->mr_v1_seen = jiffies +
 792                                 IGMP_V1_Router_Present_Timeout;
 793                         group = 0;
 794                 } else {
 795                         /* v2 router present */
 796                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 797                         in_dev->mr_v2_seen = jiffies +
 798                                 IGMP_V2_Router_Present_Timeout;
 799                 }
 800                 /* cancel the interface change timer */
 801                 in_dev->mr_ifc_count = 0;
 802                 if (del_timer(&in_dev->mr_ifc_timer))
 803                         __in_dev_put(in_dev);
 804                 /* clear deleted report items */
 805                 igmpv3_clear_delrec(in_dev);
 806         } else if (len < 12) {
 807                 return; /* ignore bogus packet; freed by caller */
 808         } else { /* v3 */
 809                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 810                         return;
 811
 812                 ih3 = (struct igmpv3_query *) skb->h.raw;
 813                 if (ih3->nsrcs) {
 814                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 815                                            + ntohs(ih3->nsrcs)*sizeof(__u32)))
 816                                 return;
 817                         ih3 = (struct igmpv3_query *) skb->h.raw;
 818                 }
 819
 820                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 821                 if (!max_delay)
 822                         max_delay = 1;  /* can't mod w/ 0 */
 823                 in_dev->mr_maxdelay = max_delay;
 824                 if (ih3->qrv)
 825                         in_dev->mr_qrv = ih3->qrv;
 826                 if (!group) { /* general query */
 827                         if (ih3->nsrcs)
 828                                 return; /* no sources allowed */
 829                         igmp_gq_start_timer(in_dev);
 830                         return;
 831                 }
 832                 /* mark sources to include, if group & source-specific */
 833                 mark = ih3->nsrcs != 0;
 834         }
 835
 836         /*
 837          * - Start the timers in all of our membership records
 838          *   that the query applies to for the interface on
 839          *   which the query arrived excl. those that belong
 840          *   to a "local" group (224.0.0.X)
 841          * - For timers already running check if they need to
 842          *   be reset.
 843          * - Use the igmp->igmp_code field as the maximum
 844          *   delay possible
 845          */
 846         read_lock(&in_dev->mc_list_lock);
 847         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 848                 if (group && group != im->multiaddr)
 849                         continue;
 850                 if (im->multiaddr == IGMP_ALL_HOSTS)
 851                         continue;
 852                 spin_lock_bh(&im->lock);
 853                 if (im->tm_running)
 854                         im->gsquery = im->gsquery && mark;
 855                 else
 856                         im->gsquery = mark;
 857                 if (im->gsquery)
 858                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 859                 spin_unlock_bh(&im->lock);
 860                 igmp_mod_timer(im, max_delay);
 861         }
 862         read_unlock(&in_dev->mc_list_lock);
 863 }
 864
 865 int igmp_rcv(struct sk_buff *skb)
 866 {
 867         /* This basically follows the spec line by line -- see RFC1112 */
 868         struct igmphdr *ih;
 869         struct in_device *in_dev = in_dev_get(skb->dev);
 870         int len = skb->len;
 871
 872         if (in_dev==NULL) {
 873                 kfree_skb(skb);
 874                 return 0;
 875         }
 876
 877         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 878                 goto drop;
 879
 880         switch (skb->ip_summed) {
 881         case CHECKSUM_HW:
 882                 if (!(u16)csum_fold(skb->csum))
 883                         break;
 884                 /* fall through */
 885         case CHECKSUM_NONE:
 886                 skb->csum = 0;
 887                 if (__skb_checksum_complete(skb))
 888                         goto drop;
 889         }
 890
 891         ih = skb->h.igmph;
 892         switch (ih->type) {
 893         case IGMP_HOST_MEMBERSHIP_QUERY:
 894                 igmp_heard_query(in_dev, skb, len);
 895                 break;
 896         case IGMP_HOST_MEMBERSHIP_REPORT:
 897         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 898         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 899                 /* Is it our report looped back? */
 900                 if (((struct rtable*)skb->dst)->fl.iif == 0)
 901                         break;
 902                 /* don't rely on MC router hearing unicast reports */
 903                 if (skb->pkt_type == PACKET_MULTICAST ||
 904                     skb->pkt_type == PACKET_BROADCAST)
 905                         igmp_heard_report(in_dev, ih->group);
 906                 break;
 907         case IGMP_PIM:
 908 #ifdef CONFIG_IP_PIMSM_V1
 909                 in_dev_put(in_dev);
 910                 return pim_rcv_v1(skb);
 911 #endif
 912         case IGMP_DVMRP:
 913         case IGMP_TRACE:
 914         case IGMP_HOST_LEAVE_MESSAGE:
 915         case IGMP_MTRACE:
 916         case IGMP_MTRACE_RESP:
 917                 break;
 918         default:
 919                 NETDEBUG(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type);
 920         }
 921
 922 drop:
 923         in_dev_put(in_dev);
 924         kfree_skb(skb);
 925         return 0;
 926 }
 927
 928 #endif
 929
 930
 931 /*
 932  *      Add a filter to a device
 933  */
 934
 935 static void ip_mc_filter_add(struct in_device *in_dev, u32 addr)
 936 {
 937         char buf[MAX_ADDR_LEN];
 938         struct net_device *dev = in_dev->dev;
 939
 940         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 941            We will get multicast token leakage, when IFF_MULTICAST
 942            is changed. This check should be done in dev->set_multicast_list
 943            routine. Something sort of:
 944            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 945            --ANK
 946            */
 947         if (arp_mc_map(addr, buf, dev, 0) == 0)
 948                 dev_mc_add(dev,buf,dev->addr_len,0);
 949 }
 950
 951 /*
 952  *      Remove a filter from a device
 953  */
 954
 955 static void ip_mc_filter_del(struct in_device *in_dev, u32 addr)
 956 {
 957         char buf[MAX_ADDR_LEN];
 958         struct net_device *dev = in_dev->dev;
 959
 960         if (arp_mc_map(addr, buf, dev, 0) == 0)
 961                 dev_mc_delete(dev,buf,dev->addr_len,0);
 962 }
 963
 964 #ifdef CONFIG_IP_MULTICAST
 965 /*
 966  * deleted ip_mc_list manipulation
 967  */
 968 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
 969 {
 970         struct ip_mc_list *pmc;
 971
 972         /* this is an "ip_mc_list" for convenience; only the fields below
 973          * are actually used. In particular, the refcnt and users are not
 974          * used for management of the delete list. Using the same structure
 975          * for deleted items allows change reports to use common code with
 976          * non-deleted or query-response MCA's.
 977          */
 978         pmc = kmalloc(sizeof(*pmc), GFP_KERNEL);
 979         if (!pmc)
 980                 return;
 981         memset(pmc, 0, sizeof(*pmc));
 982         spin_lock_bh(&im->lock);
 983         pmc->interface = im->interface;
 984         in_dev_hold(in_dev);
 985         pmc->multiaddr = im->multiaddr;
 986         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
 987                 IGMP_Unsolicited_Report_Count;
 988         pmc->sfmode = im->sfmode;
 989         if (pmc->sfmode == MCAST_INCLUDE) {
 990                 struct ip_sf_list *psf;
 991
 992                 pmc->tomb = im->tomb;
 993                 pmc->sources = im->sources;
 994                 im->tomb = im->sources = NULL;
 995                 for (psf=pmc->sources; psf; psf=psf->sf_next)
 996                         psf->sf_crcount = pmc->crcount;
 997         }
 998         spin_unlock_bh(&im->lock);
 999
1000         spin_lock_bh(&in_dev->mc_tomb_lock);
1001         pmc->next = in_dev->mc_tomb;
1002         in_dev->mc_tomb = pmc;
1003         spin_unlock_bh(&in_dev->mc_tomb_lock);
1004 }
1005
1006 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr)
1007 {
1008         struct ip_mc_list *pmc, *pmc_prev;
1009         struct ip_sf_list *psf, *psf_next;
1010
1011         spin_lock_bh(&in_dev->mc_tomb_lock);
1012         pmc_prev = NULL;
1013         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1014                 if (pmc->multiaddr == multiaddr)
1015                         break;
1016                 pmc_prev = pmc;
1017         }
1018         if (pmc) {
1019                 if (pmc_prev)
1020                         pmc_prev->next = pmc->next;
1021                 else
1022                         in_dev->mc_tomb = pmc->next;
1023         }
1024         spin_unlock_bh(&in_dev->mc_tomb_lock);
1025         if (pmc) {
1026                 for (psf=pmc->tomb; psf; psf=psf_next) {
1027                         psf_next = psf->sf_next;
1028                         kfree(psf);
1029                 }
1030                 in_dev_put(pmc->interface);
1031                 kfree(pmc);
1032         }
1033 }
1034
1035 static void igmpv3_clear_delrec(struct in_device *in_dev)
1036 {
1037         struct ip_mc_list *pmc, *nextpmc;
1038
1039         spin_lock_bh(&in_dev->mc_tomb_lock);
1040         pmc = in_dev->mc_tomb;
1041         in_dev->mc_tomb = NULL;
1042         spin_unlock_bh(&in_dev->mc_tomb_lock);
1043
1044         for (; pmc; pmc = nextpmc) {
1045                 nextpmc = pmc->next;
1046                 ip_mc_clear_src(pmc);
1047                 in_dev_put(pmc->interface);
1048                 kfree(pmc);
1049         }
1050         /* clear dead sources, too */
1051         read_lock(&in_dev->mc_list_lock);
1052         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1053                 struct ip_sf_list *psf, *psf_next;
1054
1055                 spin_lock_bh(&pmc->lock);
1056                 psf = pmc->tomb;
1057                 pmc->tomb = NULL;
1058                 spin_unlock_bh(&pmc->lock);
1059                 for (; psf; psf=psf_next) {
1060                         psf_next = psf->sf_next;
1061                         kfree(psf);
1062                 }
1063         }
1064         read_unlock(&in_dev->mc_list_lock);
1065 }
1066 #endif
1067
1068 static void igmp_group_dropped(struct ip_mc_list *im)
1069 {
1070         struct in_device *in_dev = im->interface;
1071 #ifdef CONFIG_IP_MULTICAST
1072         int reporter;
1073 #endif
1074
1075         if (im->loaded) {
1076                 im->loaded = 0;
1077                 ip_mc_filter_del(in_dev, im->multiaddr);
1078         }
1079
1080 #ifdef CONFIG_IP_MULTICAST
1081         if (im->multiaddr == IGMP_ALL_HOSTS)
1082                 return;
1083
1084         reporter = im->reporter;
1085         igmp_stop_timer(im);
1086
1087         if (!in_dev->dead) {
1088                 if (IGMP_V1_SEEN(in_dev))
1089                         goto done;
1090                 if (IGMP_V2_SEEN(in_dev)) {
1091                         if (reporter)
1092                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1093                         goto done;
1094                 }
1095                 /* IGMPv3 */
1096                 igmpv3_add_delrec(in_dev, im);
1097
1098                 igmp_ifc_event(in_dev);
1099         }
1100 done:
1101 #endif
1102         ip_mc_clear_src(im);
1103 }
1104
1105 static void igmp_group_added(struct ip_mc_list *im)
1106 {
1107         struct in_device *in_dev = im->interface;
1108
1109         if (im->loaded == 0) {
1110                 im->loaded = 1;
1111                 ip_mc_filter_add(in_dev, im->multiaddr);
1112         }
1113
1114 #ifdef CONFIG_IP_MULTICAST
1115         if (im->multiaddr == IGMP_ALL_HOSTS)
1116                 return;
1117
1118         if (in_dev->dead)
1119                 return;
1120         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1121                 spin_lock_bh(&im->lock);
1122                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1123                 spin_unlock_bh(&im->lock);
1124                 return;
1125         }
1126         /* else, v3 */
1127
1128         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1129                 IGMP_Unsolicited_Report_Count;
1130         igmp_ifc_event(in_dev);
1131 #endif
1132 }
1133
1134
1135 /*
1136  *      Multicast list managers
1137  */
1138
1139
1140 /*
1141  *      A socket has joined a multicast group on device dev.
1142  */
1143
1144 void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
1145 {
1146         struct ip_mc_list *im;
1147
1148         ASSERT_RTNL();
1149
1150         for (im=in_dev->mc_list; im; im=im->next) {
1151                 if (im->multiaddr == addr) {
1152                         im->users++;
1153                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1154                         goto out;
1155                 }
1156         }
1157
1158         im = kmalloc(sizeof(*im), GFP_KERNEL);
1159         if (!im)
1160                 goto out;
1161
1162         im->users=1;
1163         im->interface=in_dev;
1164         in_dev_hold(in_dev);
1165         im->multiaddr=addr;
1166         /* initial mode is (EX, empty) */
1167         im->sfmode = MCAST_EXCLUDE;
1168         im->sfcount[MCAST_INCLUDE] = 0;
1169         im->sfcount[MCAST_EXCLUDE] = 1;
1170         im->sources = NULL;
1171         im->tomb = NULL;
1172         im->crcount = 0;
1173         atomic_set(&im->refcnt, 1);
1174         spin_lock_init(&im->lock);
1175 #ifdef CONFIG_IP_MULTICAST
1176         im->tm_running=0;
1177         init_timer(&im->timer);
1178         im->timer.data=(unsigned long)im;
1179         im->timer.function=&igmp_timer_expire;
1180         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1181         im->reporter = 0;
1182         im->gsquery = 0;
1183 #endif
1184         im->loaded = 0;
1185         write_lock_bh(&in_dev->mc_list_lock);
1186         im->next=in_dev->mc_list;
1187         in_dev->mc_list=im;
1188         write_unlock_bh(&in_dev->mc_list_lock);
1189 #ifdef CONFIG_IP_MULTICAST
1190         igmpv3_del_delrec(in_dev, im->multiaddr);
1191 #endif
1192         igmp_group_added(im);
1193         if (!in_dev->dead)
1194                 ip_rt_multicast_event(in_dev);
1195 out:
1196         return;
1197 }
1198
1199 /*
1200  *      A socket has left a multicast group on device dev
1201  */
1202
1203 void ip_mc_dec_group(struct in_device *in_dev, u32 addr)
1204 {
1205         struct ip_mc_list *i, **ip;
1206
1207         ASSERT_RTNL();
1208
1209         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1210                 if (i->multiaddr==addr) {
1211                         if (--i->users == 0) {
1212                                 write_lock_bh(&in_dev->mc_list_lock);
1213                                 *ip = i->next;
1214                                 write_unlock_bh(&in_dev->mc_list_lock);
1215                                 igmp_group_dropped(i);
1216
1217                                 if (!in_dev->dead)
1218                                         ip_rt_multicast_event(in_dev);
1219
1220                                 ip_ma_put(i);
1221                                 return;
1222                         }
1223                         break;
1224                 }
1225         }
1226 }
1227
1228 /* Device going down */
1229
1230 void ip_mc_down(struct in_device *in_dev)
1231 {
1232         struct ip_mc_list *i;
1233
1234         ASSERT_RTNL();
1235
1236         for (i=in_dev->mc_list; i; i=i->next)
1237                 igmp_group_dropped(i);
1238
1239 #ifdef CONFIG_IP_MULTICAST
1240         in_dev->mr_ifc_count = 0;
1241         if (del_timer(&in_dev->mr_ifc_timer))
1242                 __in_dev_put(in_dev);
1243         in_dev->mr_gq_running = 0;
1244         if (del_timer(&in_dev->mr_gq_timer))
1245                 __in_dev_put(in_dev);
1246         igmpv3_clear_delrec(in_dev);
1247 #endif
1248
1249         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1250 }
1251
1252 void ip_mc_init_dev(struct in_device *in_dev)
1253 {
1254         ASSERT_RTNL();
1255
1256         in_dev->mc_tomb = NULL;
1257 #ifdef CONFIG_IP_MULTICAST
1258         in_dev->mr_gq_running = 0;
1259         init_timer(&in_dev->mr_gq_timer);
1260         in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1261         in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1262         in_dev->mr_ifc_count = 0;
1263         init_timer(&in_dev->mr_ifc_timer);
1264         in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1265         in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1266         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1267 #endif
1268
1269         rwlock_init(&in_dev->mc_list_lock);
1270         spin_lock_init(&in_dev->mc_tomb_lock);
1271 }
1272
1273 /* Device going up */
1274
1275 void ip_mc_up(struct in_device *in_dev)
1276 {
1277         struct ip_mc_list *i;
1278
1279         ASSERT_RTNL();
1280
1281         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1282
1283         for (i=in_dev->mc_list; i; i=i->next)
1284                 igmp_group_added(i);
1285 }
1286
1287 /*
1288  *      Device is about to be destroyed: clean up.
1289  */
1290
1291 void ip_mc_destroy_dev(struct in_device *in_dev)
1292 {
1293         struct ip_mc_list *i;
1294
1295         ASSERT_RTNL();
1296
1297         /* Deactivate timers */
1298         ip_mc_down(in_dev);
1299
1300         write_lock_bh(&in_dev->mc_list_lock);
1301         while ((i = in_dev->mc_list) != NULL) {
1302                 in_dev->mc_list = i->next;
1303                 write_unlock_bh(&in_dev->mc_list_lock);
1304
1305                 igmp_group_dropped(i);
1306                 ip_ma_put(i);
1307
1308                 write_lock_bh(&in_dev->mc_list_lock);
1309         }
1310         write_unlock_bh(&in_dev->mc_list_lock);
1311 }
1312
1313 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1314 {
1315         struct flowi fl = { .nl_u = { .ip4_u =
1316                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1317         struct rtable *rt;
1318         struct net_device *dev = NULL;
1319         struct in_device *idev = NULL;
1320
1321         if (imr->imr_ifindex) {
1322                 idev = inetdev_by_index(imr->imr_ifindex);
1323                 if (idev)
1324                         __in_dev_put(idev);
1325                 return idev;
1326         }
1327         if (imr->imr_address.s_addr) {
1328                 dev = ip_dev_find(imr->imr_address.s_addr);
1329                 if (!dev)
1330                         return NULL;
1331                 __dev_put(dev);
1332         }
1333
1334         if (!dev && !ip_route_output_key(&rt, &fl)) {
1335                 dev = rt->u.dst.dev;
1336                 ip_rt_put(rt);
1337         }
1338         if (dev) {
1339                 imr->imr_ifindex = dev->ifindex;
1340                 idev = __in_dev_get_rtnl(dev);
1341         }
1342         return idev;
1343 }
1344
1345 /*
1346  *      Join a socket to a group
1347  */
1348 int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS;
1349 int sysctl_igmp_max_msf = IP_MAX_MSF;
1350
1351
1352 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1353         __u32 *psfsrc)
1354 {
1355         struct ip_sf_list *psf, *psf_prev;
1356         int rv = 0;
1357
1358         psf_prev = NULL;
1359         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1360                 if (psf->sf_inaddr == *psfsrc)
1361                         break;
1362                 psf_prev = psf;
1363         }
1364         if (!psf || psf->sf_count[sfmode] == 0) {
1365                 /* source filter not found, or count wrong =>  bug */
1366                 return -ESRCH;
1367         }
1368         psf->sf_count[sfmode]--;
1369         if (psf->sf_count[sfmode] == 0) {
1370                 ip_rt_multicast_event(pmc->interface);
1371         }
1372         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1373 #ifdef CONFIG_IP_MULTICAST
1374                 struct in_device *in_dev = pmc->interface;
1375 #endif
1376
1377                 /* no more filters for this source */
1378                 if (psf_prev)
1379                         psf_prev->sf_next = psf->sf_next;
1380                 else
1381                         pmc->sources = psf->sf_next;
1382 #ifdef CONFIG_IP_MULTICAST
1383                 if (psf->sf_oldin &&
1384                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1385                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1386                                 IGMP_Unsolicited_Report_Count;
1387                         psf->sf_next = pmc->tomb;
1388                         pmc->tomb = psf;
1389                         rv = 1;
1390                 } else
1391 #endif
1392                         kfree(psf);
1393         }
1394         return rv;
1395 }
1396
1397 #ifndef CONFIG_IP_MULTICAST
1398 #define igmp_ifc_event(x)       do { } while (0)
1399 #endif
1400
1401 static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1402                          int sfcount, __u32 *psfsrc, int delta)
1403 {
1404         struct ip_mc_list *pmc;
1405         int     changerec = 0;
1406         int     i, err;
1407
1408         if (!in_dev)
1409                 return -ENODEV;
1410         read_lock(&in_dev->mc_list_lock);
1411         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1412                 if (*pmca == pmc->multiaddr)
1413                         break;
1414         }
1415         if (!pmc) {
1416                 /* MCA not found?? bug */
1417                 read_unlock(&in_dev->mc_list_lock);
1418                 return -ESRCH;
1419         }
1420         spin_lock_bh(&pmc->lock);
1421         read_unlock(&in_dev->mc_list_lock);
1422 #ifdef CONFIG_IP_MULTICAST
1423         sf_markstate(pmc);
1424 #endif
1425         if (!delta) {
1426                 err = -EINVAL;
1427                 if (!pmc->sfcount[sfmode])
1428                         goto out_unlock;
1429                 pmc->sfcount[sfmode]--;
1430         }
1431         err = 0;
1432         for (i=0; i<sfcount; i++) {
1433                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1434
1435                 changerec |= rv > 0;
1436                 if (!err && rv < 0)
1437                         err = rv;
1438         }
1439         if (pmc->sfmode == MCAST_EXCLUDE &&
1440             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1441             pmc->sfcount[MCAST_INCLUDE]) {
1442 #ifdef CONFIG_IP_MULTICAST
1443                 struct ip_sf_list *psf;
1444 #endif
1445
1446                 /* filter mode change */
1447                 pmc->sfmode = MCAST_INCLUDE;
1448 #ifdef CONFIG_IP_MULTICAST
1449                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1450                         IGMP_Unsolicited_Report_Count;
1451                 in_dev->mr_ifc_count = pmc->crcount;
1452                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1453                         psf->sf_crcount = 0;
1454                 igmp_ifc_event(pmc->interface);
1455         } else if (sf_setstate(pmc) || changerec) {
1456                 igmp_ifc_event(pmc->interface);
1457 #endif
1458         }
1459 out_unlock:
1460         spin_unlock_bh(&pmc->lock);
1461         return err;
1462 }
1463
1464 /*
1465  * Add multicast single-source filter to the interface list
1466  */
1467 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1468         __u32 *psfsrc, int delta)
1469 {
1470         struct ip_sf_list *psf, *psf_prev;
1471
1472         psf_prev = NULL;
1473         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1474                 if (psf->sf_inaddr == *psfsrc)
1475                         break;
1476                 psf_prev = psf;
1477         }
1478         if (!psf) {
1479                 psf = kmalloc(sizeof(*psf), GFP_ATOMIC);
1480                 if (!psf)
1481                         return -ENOBUFS;
1482                 memset(psf, 0, sizeof(*psf));
1483                 psf->sf_inaddr = *psfsrc;
1484                 if (psf_prev) {
1485                         psf_prev->sf_next = psf;
1486                 } else
1487                         pmc->sources = psf;
1488         }
1489         psf->sf_count[sfmode]++;
1490         if (psf->sf_count[sfmode] == 1) {
1491                 ip_rt_multicast_event(pmc->interface);
1492         }
1493         return 0;
1494 }
1495
1496 #ifdef CONFIG_IP_MULTICAST
1497 static void sf_markstate(struct ip_mc_list *pmc)
1498 {
1499         struct ip_sf_list *psf;
1500         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1501
1502         for (psf=pmc->sources; psf; psf=psf->sf_next)
1503                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1504                         psf->sf_oldin = mca_xcount ==
1505                                 psf->sf_count[MCAST_EXCLUDE] &&
1506                                 !psf->sf_count[MCAST_INCLUDE];
1507                 } else
1508                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1509 }
1510
1511 static int sf_setstate(struct ip_mc_list *pmc)
1512 {
1513         struct ip_sf_list *psf;
1514         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1515         int qrv = pmc->interface->mr_qrv;
1516         int new_in, rv;
1517
1518         rv = 0;
1519         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1520                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1521                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1522                                 !psf->sf_count[MCAST_INCLUDE];
1523                 } else
1524                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1525                 if (new_in != psf->sf_oldin) {
1526                         psf->sf_crcount = qrv;
1527                         rv++;
1528                 }
1529         }
1530         return rv;
1531 }
1532 #endif
1533
1534 /*
1535  * Add multicast source filter list to the interface list
1536  */
1537 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1538                          int sfcount, __u32 *psfsrc, int delta)
1539 {
1540         struct ip_mc_list *pmc;
1541         int     isexclude;
1542         int     i, err;
1543
1544         if (!in_dev)
1545                 return -ENODEV;
1546         read_lock(&in_dev->mc_list_lock);
1547         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1548                 if (*pmca == pmc->multiaddr)
1549                         break;
1550         }
1551         if (!pmc) {
1552                 /* MCA not found?? bug */
1553                 read_unlock(&in_dev->mc_list_lock);
1554                 return -ESRCH;
1555         }
1556         spin_lock_bh(&pmc->lock);
1557         read_unlock(&in_dev->mc_list_lock);
1558
1559 #ifdef CONFIG_IP_MULTICAST
1560         sf_markstate(pmc);
1561 #endif
1562         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1563         if (!delta)
1564                 pmc->sfcount[sfmode]++;
1565         err = 0;
1566         for (i=0; i<sfcount; i++) {
1567                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1568                 if (err)
1569                         break;
1570         }
1571         if (err) {
1572                 int j;
1573
1574                 pmc->sfcount[sfmode]--;
1575                 for (j=0; j<i; j++)
1576                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1577         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1578 #ifdef CONFIG_IP_MULTICAST
1579                 struct in_device *in_dev = pmc->interface;
1580                 struct ip_sf_list *psf;
1581 #endif
1582
1583                 /* filter mode change */
1584                 if (pmc->sfcount[MCAST_EXCLUDE])
1585                         pmc->sfmode = MCAST_EXCLUDE;
1586                 else if (pmc->sfcount[MCAST_INCLUDE])
1587                         pmc->sfmode = MCAST_INCLUDE;
1588 #ifdef CONFIG_IP_MULTICAST
1589                 /* else no filters; keep old mode for reports */
1590
1591                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1592                         IGMP_Unsolicited_Report_Count;
1593                 in_dev->mr_ifc_count = pmc->crcount;
1594                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1595                         psf->sf_crcount = 0;
1596                 igmp_ifc_event(in_dev);
1597         } else if (sf_setstate(pmc)) {
1598                 igmp_ifc_event(in_dev);
1599 #endif
1600         }
1601         spin_unlock_bh(&pmc->lock);
1602         return err;
1603 }
1604
1605 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1606 {
1607         struct ip_sf_list *psf, *nextpsf;
1608
1609         for (psf=pmc->tomb; psf; psf=nextpsf) {
1610                 nextpsf = psf->sf_next;
1611                 kfree(psf);
1612         }
1613         pmc->tomb = NULL;
1614         for (psf=pmc->sources; psf; psf=nextpsf) {
1615                 nextpsf = psf->sf_next;
1616                 kfree(psf);
1617         }
1618         pmc->sources = NULL;
1619         pmc->sfmode = MCAST_EXCLUDE;
1620         pmc->sfcount[MCAST_INCLUDE] = 0;
1621         pmc->sfcount[MCAST_EXCLUDE] = 1;
1622 }
1623
1624
1625 /*
1626  * Join a multicast group
1627  */
1628 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1629 {
1630         int err;
1631         u32 addr = imr->imr_multiaddr.s_addr;
1632         struct ip_mc_socklist *iml=NULL, *i;
1633         struct in_device *in_dev;
1634         struct inet_sock *inet = inet_sk(sk);
1635         int ifindex;
1636         int count = 0;
1637
1638         if (!MULTICAST(addr))
1639                 return -EINVAL;
1640
1641         rtnl_shlock();
1642
1643         in_dev = ip_mc_find_dev(imr);
1644
1645         if (!in_dev) {
1646                 iml = NULL;
1647                 err = -ENODEV;
1648                 goto done;
1649         }
1650
1651         err = -EADDRINUSE;
1652         ifindex = imr->imr_ifindex;
1653         for (i = inet->mc_list; i; i = i->next) {
1654                 if (i->multi.imr_multiaddr.s_addr == addr &&
1655                     i->multi.imr_ifindex == ifindex)
1656                         goto done;
1657                 count++;
1658         }
1659         err = -ENOBUFS;
1660         if (count >= sysctl_igmp_max_memberships)
1661                 goto done;
1662         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1663         if (iml == NULL)
1664                 goto done;
1665
1666         memcpy(&iml->multi, imr, sizeof(*imr));
1667         iml->next = inet->mc_list;
1668         iml->sflist = NULL;
1669         iml->sfmode = MCAST_EXCLUDE;
1670         inet->mc_list = iml;
1671         ip_mc_inc_group(in_dev, addr);
1672         err = 0;
1673 done:
1674         rtnl_shunlock();
1675         return err;
1676 }
1677
1678 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1679                            struct in_device *in_dev)
1680 {
1681         int err;
1682
1683         if (iml->sflist == 0) {
1684                 /* any-source empty exclude case */
1685                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1686                         iml->sfmode, 0, NULL, 0);
1687         }
1688         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1689                         iml->sfmode, iml->sflist->sl_count,
1690                         iml->sflist->sl_addr, 0);
1691         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1692         iml->sflist = NULL;
1693         return err;
1694 }
1695
1696 /*
1697  *      Ask a socket to leave a group.
1698  */
1699
1700 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1701 {
1702         struct inet_sock *inet = inet_sk(sk);
1703         struct ip_mc_socklist *iml, **imlp;
1704         struct in_device *in_dev;
1705         u32 group = imr->imr_multiaddr.s_addr;
1706         u32 ifindex;
1707
1708         rtnl_lock();
1709         in_dev = ip_mc_find_dev(imr);
1710         if (!in_dev) {
1711                 rtnl_unlock();
1712                 return -ENODEV;
1713         }
1714         ifindex = imr->imr_ifindex;
1715         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1716                 if (iml->multi.imr_multiaddr.s_addr == group &&
1717                     iml->multi.imr_ifindex == ifindex) {
1718                         (void) ip_mc_leave_src(sk, iml, in_dev);
1719
1720                         *imlp = iml->next;
1721
1722                         ip_mc_dec_group(in_dev, group);
1723                         rtnl_unlock();
1724                         sock_kfree_s(sk, iml, sizeof(*iml));
1725                         return 0;
1726                 }
1727         }
1728         rtnl_unlock();
1729         return -EADDRNOTAVAIL;
1730 }
1731
1732 int ip_mc_source(int add, int omode, struct sock *sk, struct
1733         ip_mreq_source *mreqs, int ifindex)
1734 {
1735         int err;
1736         struct ip_mreqn imr;
1737         u32 addr = mreqs->imr_multiaddr;
1738         struct ip_mc_socklist *pmc;
1739         struct in_device *in_dev = NULL;
1740         struct inet_sock *inet = inet_sk(sk);
1741         struct ip_sf_socklist *psl;
1742         int leavegroup = 0;
1743         int i, j, rv;
1744
1745         if (!MULTICAST(addr))
1746                 return -EINVAL;
1747
1748         rtnl_shlock();
1749
1750         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1751         imr.imr_address.s_addr = mreqs->imr_interface;
1752         imr.imr_ifindex = ifindex;
1753         in_dev = ip_mc_find_dev(&imr);
1754
1755         if (!in_dev) {
1756                 err = -ENODEV;
1757                 goto done;
1758         }
1759         err = -EADDRNOTAVAIL;
1760
1761         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1762                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1763                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1764                         break;
1765         }
1766         if (!pmc) {             /* must have a prior join */
1767                 err = -EINVAL;
1768                 goto done;
1769         }
1770         /* if a source filter was set, must be the same mode as before */
1771         if (pmc->sflist) {
1772                 if (pmc->sfmode != omode) {
1773                         err = -EINVAL;
1774                         goto done;
1775                 }
1776         } else if (pmc->sfmode != omode) {
1777                 /* allow mode switches for empty-set filters */
1778                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1779                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1780                         NULL, 0);
1781                 pmc->sfmode = omode;
1782         }
1783
1784         psl = pmc->sflist;
1785         if (!add) {
1786                 if (!psl)
1787                         goto done;      /* err = -EADDRNOTAVAIL */
1788                 rv = !0;
1789                 for (i=0; i<psl->sl_count; i++) {
1790                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1791                                 sizeof(__u32));
1792                         if (rv == 0)
1793                                 break;
1794                 }
1795                 if (rv)         /* source not found */
1796                         goto done;      /* err = -EADDRNOTAVAIL */
1797
1798                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1799                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1800                         leavegroup = 1;
1801                         goto done;
1802                 }
1803
1804                 /* update the interface filter */
1805                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1806                         &mreqs->imr_sourceaddr, 1);
1807
1808                 for (j=i+1; j<psl->sl_count; j++)
1809                         psl->sl_addr[j-1] = psl->sl_addr[j];
1810                 psl->sl_count--;
1811                 err = 0;
1812                 goto done;
1813         }
1814         /* else, add a new source to the filter */
1815
1816         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1817                 err = -ENOBUFS;
1818                 goto done;
1819         }
1820         if (!psl || psl->sl_count == psl->sl_max) {
1821                 struct ip_sf_socklist *newpsl;
1822                 int count = IP_SFBLOCK;
1823
1824                 if (psl)
1825                         count += psl->sl_max;
1826                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1827                 if (!newpsl) {
1828                         err = -ENOBUFS;
1829                         goto done;
1830                 }
1831                 newpsl->sl_max = count;
1832                 newpsl->sl_count = count - IP_SFBLOCK;
1833                 if (psl) {
1834                         for (i=0; i<psl->sl_count; i++)
1835                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1836                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1837                 }
1838                 pmc->sflist = psl = newpsl;
1839         }
1840         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1841         for (i=0; i<psl->sl_count; i++) {
1842                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1843                         sizeof(__u32));
1844                 if (rv == 0)
1845                         break;
1846         }
1847         if (rv == 0)            /* address already there is an error */
1848                 goto done;
1849         for (j=psl->sl_count-1; j>=i; j--)
1850                 psl->sl_addr[j+1] = psl->sl_addr[j];
1851         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1852         psl->sl_count++;
1853         err = 0;
1854         /* update the interface list */
1855         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1856                 &mreqs->imr_sourceaddr, 1);
1857 done:
1858         rtnl_shunlock();
1859         if (leavegroup)
1860                 return ip_mc_leave_group(sk, &imr);
1861         return err;
1862 }
1863
1864 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1865 {
1866         int err = 0;
1867         struct ip_mreqn imr;
1868         u32 addr = msf->imsf_multiaddr;
1869         struct ip_mc_socklist *pmc;
1870         struct in_device *in_dev;
1871         struct inet_sock *inet = inet_sk(sk);
1872         struct ip_sf_socklist *newpsl, *psl;
1873         int leavegroup = 0;
1874
1875         if (!MULTICAST(addr))
1876                 return -EINVAL;
1877         if (msf->imsf_fmode != MCAST_INCLUDE &&
1878             msf->imsf_fmode != MCAST_EXCLUDE)
1879                 return -EINVAL;
1880
1881         rtnl_shlock();
1882
1883         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1884         imr.imr_address.s_addr = msf->imsf_interface;
1885         imr.imr_ifindex = ifindex;
1886         in_dev = ip_mc_find_dev(&imr);
1887
1888         if (!in_dev) {
1889                 err = -ENODEV;
1890                 goto done;
1891         }
1892
1893         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1894         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
1895                 leavegroup = 1;
1896                 goto done;
1897         }
1898
1899         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1900                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1901                     pmc->multi.imr_ifindex == imr.imr_ifindex)
1902                         break;
1903         }
1904         if (!pmc) {             /* must have a prior join */
1905                 err = -EINVAL;
1906                 goto done;
1907         }
1908         if (msf->imsf_numsrc) {
1909                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
1910                                                            GFP_KERNEL);
1911                 if (!newpsl) {
1912                         err = -ENOBUFS;
1913                         goto done;
1914                 }
1915                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
1916                 memcpy(newpsl->sl_addr, msf->imsf_slist,
1917                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
1918                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1919                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
1920                 if (err) {
1921                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
1922                         goto done;
1923                 }
1924         } else {
1925                 newpsl = NULL;
1926                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
1927                                      msf->imsf_fmode, 0, NULL, 0);
1928         }
1929         psl = pmc->sflist;
1930         if (psl) {
1931                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1932                         psl->sl_count, psl->sl_addr, 0);
1933                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1934         } else
1935                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
1936                         0, NULL, 0);
1937         pmc->sflist = newpsl;
1938         pmc->sfmode = msf->imsf_fmode;
1939         err = 0;
1940 done:
1941         rtnl_shunlock();
1942         if (leavegroup)
1943                 err = ip_mc_leave_group(sk, &imr);
1944         return err;
1945 }
1946
1947 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
1948         struct ip_msfilter __user *optval, int __user *optlen)
1949 {
1950         int err, len, count, copycount;
1951         struct ip_mreqn imr;
1952         u32 addr = msf->imsf_multiaddr;
1953         struct ip_mc_socklist *pmc;
1954         struct in_device *in_dev;
1955         struct inet_sock *inet = inet_sk(sk);
1956         struct ip_sf_socklist *psl;
1957
1958         if (!MULTICAST(addr))
1959                 return -EINVAL;
1960
1961         rtnl_shlock();
1962
1963         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1964         imr.imr_address.s_addr = msf->imsf_interface;
1965         imr.imr_ifindex = 0;
1966         in_dev = ip_mc_find_dev(&imr);
1967
1968         if (!in_dev) {
1969                 err = -ENODEV;
1970                 goto done;
1971         }
1972         err = -EADDRNOTAVAIL;
1973
1974         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1975                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1976                     pmc->multi.imr_ifindex == imr.imr_ifindex)
1977                         break;
1978         }
1979         if (!pmc)               /* must have a prior join */
1980                 goto done;
1981         msf->imsf_fmode = pmc->sfmode;
1982         psl = pmc->sflist;
1983         rtnl_shunlock();
1984         if (!psl) {
1985                 len = 0;
1986                 count = 0;
1987         } else {
1988                 count = psl->sl_count;
1989         }
1990         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
1991         len = copycount * sizeof(psl->sl_addr[0]);
1992         msf->imsf_numsrc = count;
1993         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
1994             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
1995                 return -EFAULT;
1996         }
1997         if (len &&
1998             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
1999                 return -EFAULT;
2000         return 0;
2001 done:
2002         rtnl_shunlock();
2003         return err;
2004 }
2005
2006 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2007         struct group_filter __user *optval, int __user *optlen)
2008 {
2009         int err, i, count, copycount;
2010         struct sockaddr_in *psin;
2011         u32 addr;
2012         struct ip_mc_socklist *pmc;
2013         struct inet_sock *inet = inet_sk(sk);
2014         struct ip_sf_socklist *psl;
2015
2016         psin = (struct sockaddr_in *)&gsf->gf_group;
2017         if (psin->sin_family != AF_INET)
2018                 return -EINVAL;
2019         addr = psin->sin_addr.s_addr;
2020         if (!MULTICAST(addr))
2021                 return -EINVAL;
2022
2023         rtnl_shlock();
2024
2025         err = -EADDRNOTAVAIL;
2026
2027         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2028                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2029                     pmc->multi.imr_ifindex == gsf->gf_interface)
2030                         break;
2031         }
2032         if (!pmc)               /* must have a prior join */
2033                 goto done;
2034         gsf->gf_fmode = pmc->sfmode;
2035         psl = pmc->sflist;
2036         rtnl_shunlock();
2037         count = psl ? psl->sl_count : 0;
2038         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2039         gsf->gf_numsrc = count;
2040         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2041             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2042                 return -EFAULT;
2043         }
2044         for (i=0; i<copycount; i++) {
2045                 struct sockaddr_in *psin;
2046                 struct sockaddr_storage ss;
2047
2048                 psin = (struct sockaddr_in *)&ss;
2049                 memset(&ss, 0, sizeof(ss));
2050                 psin->sin_family = AF_INET;
2051                 psin->sin_addr.s_addr = psl->sl_addr[i];
2052                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2053                         return -EFAULT;
2054         }
2055         return 0;
2056 done:
2057         rtnl_shunlock();
2058         return err;
2059 }
2060
2061 /*
2062  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2063  */
2064 int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
2065 {
2066         struct inet_sock *inet = inet_sk(sk);
2067         struct ip_mc_socklist *pmc;
2068         struct ip_sf_socklist *psl;
2069         int i;
2070
2071         if (!MULTICAST(loc_addr))
2072                 return 1;
2073
2074         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2075                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2076                     pmc->multi.imr_ifindex == dif)
2077                         break;
2078         }
2079         if (!pmc)
2080                 return 1;
2081         psl = pmc->sflist;
2082         if (!psl)
2083                 return pmc->sfmode == MCAST_EXCLUDE;
2084
2085         for (i=0; i<psl->sl_count; i++) {
2086                 if (psl->sl_addr[i] == rmt_addr)
2087                         break;
2088         }
2089         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2090                 return 0;
2091         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2092                 return 0;
2093         return 1;
2094 }
2095
2096 /*
2097  *      A socket is closing.
2098  */
2099
2100 void ip_mc_drop_socket(struct sock *sk)
2101 {
2102         struct inet_sock *inet = inet_sk(sk);
2103         struct ip_mc_socklist *iml;
2104
2105         if (inet->mc_list == NULL)
2106                 return;
2107
2108         rtnl_lock();
2109         while ((iml = inet->mc_list) != NULL) {
2110                 struct in_device *in_dev;
2111                 inet->mc_list = iml->next;
2112
2113                 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) {
2114                         (void) ip_mc_leave_src(sk, iml, in_dev);
2115                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2116                         in_dev_put(in_dev);
2117                 }
2118                 sock_kfree_s(sk, iml, sizeof(*iml));
2119
2120         }
2121         rtnl_unlock();
2122 }
2123
2124 int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto)
2125 {
2126         struct ip_mc_list *im;
2127         struct ip_sf_list *psf;
2128         int rv = 0;
2129
2130         read_lock(&in_dev->mc_list_lock);
2131         for (im=in_dev->mc_list; im; im=im->next) {
2132                 if (im->multiaddr == mc_addr)
2133                         break;
2134         }
2135         if (im && proto == IPPROTO_IGMP) {
2136                 rv = 1;
2137         } else if (im) {
2138                 if (src_addr) {
2139                         for (psf=im->sources; psf; psf=psf->sf_next) {
2140                                 if (psf->sf_inaddr == src_addr)
2141                                         break;
2142                         }
2143                         if (psf)
2144                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2145                                         psf->sf_count[MCAST_EXCLUDE] !=
2146                                         im->sfcount[MCAST_EXCLUDE];
2147                         else
2148                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2149                 } else
2150                         rv = 1; /* unspecified source; tentatively allow */
2151         }
2152         read_unlock(&in_dev->mc_list_lock);
2153         return rv;
2154 }
2155
2156 #if defined(CONFIG_PROC_FS)
2157 struct igmp_mc_iter_state {
2158         struct net_device *dev;
2159         struct in_device *in_dev;
2160 };
2161
2162 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2163
2164 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2165 {
2166         struct ip_mc_list *im = NULL;
2167         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2168
2169         for (state->dev = dev_base, state->in_dev = NULL;
2170              state->dev;
2171              state->dev = state->dev->next) {
2172                 struct in_device *in_dev;
2173                 in_dev = in_dev_get(state->dev);
2174                 if (!in_dev)
2175                         continue;
2176                 read_lock(&in_dev->mc_list_lock);
2177                 im = in_dev->mc_list;
2178                 if (im) {
2179                         state->in_dev = in_dev;
2180                         break;
2181                 }
2182                 read_unlock(&in_dev->mc_list_lock);
2183                 in_dev_put(in_dev);
2184         }
2185         return im;
2186 }
2187
2188 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2189 {
2190         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2191         im = im->next;
2192         while (!im) {
2193                 if (likely(state->in_dev != NULL)) {
2194                         read_unlock(&state->in_dev->mc_list_lock);
2195                         in_dev_put(state->in_dev);
2196                 }
2197                 state->dev = state->dev->next;
2198                 if (!state->dev) {
2199                         state->in_dev = NULL;
2200                         break;
2201                 }
2202                 state->in_dev = in_dev_get(state->dev);
2203                 if (!state->in_dev)
2204                         continue;
2205                 read_lock(&state->in_dev->mc_list_lock);
2206                 im = state->in_dev->mc_list;
2207         }
2208         return im;
2209 }
2210
2211 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2212 {
2213         struct ip_mc_list *im = igmp_mc_get_first(seq);
2214         if (im)
2215                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2216                         --pos;
2217         return pos ? NULL : im;
2218 }
2219
2220 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2221 {
2222         read_lock(&dev_base_lock);
2223         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2224 }
2225
2226 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2227 {
2228         struct ip_mc_list *im;
2229         if (v == SEQ_START_TOKEN)
2230                 im = igmp_mc_get_first(seq);
2231         else
2232                 im = igmp_mc_get_next(seq, v);
2233         ++*pos;
2234         return im;
2235 }
2236
2237 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2238 {
2239         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2240         if (likely(state->in_dev != NULL)) {
2241                 read_unlock(&state->in_dev->mc_list_lock);
2242                 in_dev_put(state->in_dev);
2243                 state->in_dev = NULL;
2244         }
2245         state->dev = NULL;
2246         read_unlock(&dev_base_lock);
2247 }
2248
2249 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2250 {
2251         if (v == SEQ_START_TOKEN)
2252                 seq_puts(seq,
2253                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2254         else {
2255                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2256                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2257                 char   *querier;
2258 #ifdef CONFIG_IP_MULTICAST
2259                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2260                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2261                           "V3";
2262 #else
2263                 querier = "NONE";
2264 #endif
2265
2266                 if (state->in_dev->mc_list == im) {
2267                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2268                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2269                 }
2270
2271                 seq_printf(seq,
2272                            "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n",
2273                            im->multiaddr, im->users,
2274                            im->tm_running, im->tm_running ?
2275                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2276                            im->reporter);
2277         }
2278         return 0;
2279 }
2280
2281 static struct seq_operations igmp_mc_seq_ops = {
2282         .start  =       igmp_mc_seq_start,
2283         .next   =       igmp_mc_seq_next,
2284         .stop   =       igmp_mc_seq_stop,
2285         .show   =       igmp_mc_seq_show,
2286 };
2287
2288 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2289 {
2290         struct seq_file *seq;
2291         int rc = -ENOMEM;
2292         struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2293
2294         if (!s)
2295                 goto out;
2296         rc = seq_open(file, &igmp_mc_seq_ops);
2297         if (rc)
2298                 goto out_kfree;
2299
2300         seq = file->private_data;
2301         seq->private = s;
2302         memset(s, 0, sizeof(*s));
2303 out:
2304         return rc;
2305 out_kfree:
2306         kfree(s);
2307         goto out;
2308 }
2309
2310 static struct file_operations igmp_mc_seq_fops = {
2311         .owner          =       THIS_MODULE,
2312         .open           =       igmp_mc_seq_open,
2313         .read           =       seq_read,
2314         .llseek         =       seq_lseek,
2315         .release        =       seq_release_private,
2316 };
2317
2318 struct igmp_mcf_iter_state {
2319         struct net_device *dev;
2320         struct in_device *idev;
2321         struct ip_mc_list *im;
2322 };
2323
2324 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2325
2326 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2327 {
2328         struct ip_sf_list *psf = NULL;
2329         struct ip_mc_list *im = NULL;
2330         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2331
2332         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2333              state->dev;
2334              state->dev = state->dev->next) {
2335                 struct in_device *idev;
2336                 idev = in_dev_get(state->dev);
2337                 if (unlikely(idev == NULL))
2338                         continue;
2339                 read_lock(&idev->mc_list_lock);
2340                 im = idev->mc_list;
2341                 if (likely(im != NULL)) {
2342                         spin_lock_bh(&im->lock);
2343                         psf = im->sources;
2344                         if (likely(psf != NULL)) {
2345                                 state->im = im;
2346                                 state->idev = idev;
2347                                 break;
2348                         }
2349                         spin_unlock_bh(&im->lock);
2350                 }
2351                 read_unlock(&idev->mc_list_lock);
2352                 in_dev_put(idev);
2353         }
2354         return psf;
2355 }
2356
2357 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2358 {
2359         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2360
2361         psf = psf->sf_next;
2362         while (!psf) {
2363                 spin_unlock_bh(&state->im->lock);
2364                 state->im = state->im->next;
2365                 while (!state->im) {
2366                         if (likely(state->idev != NULL)) {
2367                                 read_unlock(&state->idev->mc_list_lock);
2368                                 in_dev_put(state->idev);
2369                         }
2370                         state->dev = state->dev->next;
2371                         if (!state->dev) {
2372                                 state->idev = NULL;
2373                                 goto out;
2374                         }
2375                         state->idev = in_dev_get(state->dev);
2376                         if (!state->idev)
2377                                 continue;
2378                         read_lock(&state->idev->mc_list_lock);
2379                         state->im = state->idev->mc_list;
2380                 }
2381                 if (!state->im)
2382                         break;
2383                 spin_lock_bh(&state->im->lock);
2384                 psf = state->im->sources;
2385         }
2386 out:
2387         return psf;
2388 }
2389
2390 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2391 {
2392         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2393         if (psf)
2394                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2395                         --pos;
2396         return pos ? NULL : psf;
2397 }
2398
2399 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2400 {
2401         read_lock(&dev_base_lock);
2402         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2403 }
2404
2405 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2406 {
2407         struct ip_sf_list *psf;
2408         if (v == SEQ_START_TOKEN)
2409                 psf = igmp_mcf_get_first(seq);
2410         else
2411                 psf = igmp_mcf_get_next(seq, v);
2412         ++*pos;
2413         return psf;
2414 }
2415
2416 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2417 {
2418         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2419         if (likely(state->im != NULL)) {
2420                 spin_unlock_bh(&state->im->lock);
2421                 state->im = NULL;
2422         }
2423         if (likely(state->idev != NULL)) {
2424                 read_unlock(&state->idev->mc_list_lock);
2425                 in_dev_put(state->idev);
2426                 state->idev = NULL;
2427         }
2428         state->dev = NULL;
2429         read_unlock(&dev_base_lock);
2430 }
2431
2432 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2433 {
2434         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2435         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2436
2437         if (v == SEQ_START_TOKEN) {
2438                 seq_printf(seq,
2439                            "%3s %6s "
2440                            "%10s %10s %6s %6s\n", "Idx",
2441                            "Device", "MCA",
2442                            "SRC", "INC", "EXC");
2443         } else {
2444                 seq_printf(seq,
2445                            "%3d %6.6s 0x%08x "
2446                            "0x%08x %6lu %6lu\n",
2447                            state->dev->ifindex, state->dev->name,
2448                            ntohl(state->im->multiaddr),
2449                            ntohl(psf->sf_inaddr),
2450                            psf->sf_count[MCAST_INCLUDE],
2451                            psf->sf_count[MCAST_EXCLUDE]);
2452         }
2453         return 0;
2454 }
2455
2456 static struct seq_operations igmp_mcf_seq_ops = {
2457         .start  =       igmp_mcf_seq_start,
2458         .next   =       igmp_mcf_seq_next,
2459         .stop   =       igmp_mcf_seq_stop,
2460         .show   =       igmp_mcf_seq_show,
2461 };
2462
2463 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2464 {
2465         struct seq_file *seq;
2466         int rc = -ENOMEM;
2467         struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2468
2469         if (!s)
2470                 goto out;
2471         rc = seq_open(file, &igmp_mcf_seq_ops);
2472         if (rc)
2473                 goto out_kfree;
2474
2475         seq = file->private_data;
2476         seq->private = s;
2477         memset(s, 0, sizeof(*s));
2478 out:
2479         return rc;
2480 out_kfree:
2481         kfree(s);
2482         goto out;
2483 }
2484
2485 static struct file_operations igmp_mcf_seq_fops = {
2486         .owner          =       THIS_MODULE,
2487         .open           =       igmp_mcf_seq_open,
2488         .read           =       seq_read,
2489         .llseek         =       seq_lseek,
2490         .release        =       seq_release_private,
2491 };
2492
2493 int __init igmp_mc_proc_init(void)
2494 {
2495         proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2496         proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2497         return 0;
2498 }
2499 #endif
2500
2501 EXPORT_SYMBOL(ip_mc_dec_group);
2502 EXPORT_SYMBOL(ip_mc_inc_group);
2503 EXPORT_SYMBOL(ip_mc_join_group);