net/ipv4/igmp.c

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