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   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
  12  *
  13  *      Authors:
  14  *              Alan Cox <Alan.Cox@linux.org>
  15  *
  16  *      This program is free software; you can redistribute it and/or
  17  *      modify it under the terms of the GNU General Public License
  18  *      as published by the Free Software Foundation; either version
  19  *      2 of the License, or (at your option) any later version.
  20  *
  21  *      Fixes:
  22  *
  23  *              Alan Cox        :       Added lots of __inline__ to optimise
  24  *                                      the memory usage of all the tiny little
  25  *                                      functions.
  26  *              Alan Cox        :       Dumped the header building experiment.
  27  *              Alan Cox        :       Minor tweaks ready for multicast routing
  28  *                                      and extended IGMP protocol.
  29  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  30  *                                      writes utterly bogus code otherwise (sigh)
  31  *                                      fixed IGMP loopback to behave in the manner
  32  *                                      desired by mrouted, fixed the fact it has been
  33  *                                      broken since 1.3.6 and cleaned up a few minor
  34  *                                      points.
  35  *
  36  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  37  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  38  *                                      The enhancements are mainly based on Steve Deering's
  39  *                                      ipmulti-3.5 source code.
  40  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  41  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  42  *                                      the mrouted version on that device.
  43  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  44  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  45  *                                      to identify the multicast router version
  46  *                                      and do what the IGMP version 2 specified.
  47  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  48  *              Tsu-Sheng Tsao          if the specified time expired.
  49  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  50  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  51  *              Christian Daudt :       igmp timer wasn't set for local group
  52  *                                      memberships but was being deleted,
  53  *                                      which caused a "del_timer() called
  54  *                                      from %p with timer not initialized\n"
  55  *                                      message (960131).
  56  *              Christian Daudt :       removed del_timer from
  57  *                                      igmp_timer_expire function (960205).
  58  *             Christian Daudt :       igmp_heard_report now only calls
  59  *                                     igmp_timer_expire if tm->running is
  60  *                                     true (960216).
  61  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  62  *                                      igmp_heard_query never trigger. Expiry
  63  *                                      miscalculation fixed in igmp_heard_query
  64  *                                      and random() made to return unsigned to
  65  *                                      prevent negative expiry times.
  66  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  67  *                                      fix from pending 2.1.x patches.
  68  *              Alan Cox:               Forget to enable FDDI support earlier.
  69  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  70  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  71  *              David L Stevens:        IGMPv3 support, with help from
  72  *                                      Vinay Kulkarni
  73  */
  74
  75 #include <linux/module.h>
  76 #include <asm/uaccess.h>
  77 #include <asm/system.h>
  78 #include <linux/types.h>
  79 #include <linux/kernel.h>
  80 #include <linux/jiffies.h>
  81 #include <linux/string.h>
  82 #include <linux/socket.h>
  83 #include <linux/sockios.h>
  84 #include <linux/in.h>
  85 #include <linux/inet.h>
  86 #include <linux/netdevice.h>
  87 #include <linux/skbuff.h>
  88 #include <linux/inetdevice.h>
  89 #include <linux/igmp.h>
  90 #include <linux/if_arp.h>
  91 #include <linux/rtnetlink.h>
  92 #include <linux/times.h>
  93
  94 #include <net/arp.h>
  95 #include <net/ip.h>
  96 #include <net/protocol.h>
  97 #include <net/route.h>
  98 #include <net/sock.h>
  99 #include <net/checksum.h>
 100 #include <linux/netfilter_ipv4.h>
 101 #ifdef CONFIG_IP_MROUTE
 102 #include <linux/mroute.h>
 103 #endif
 104 #ifdef CONFIG_PROC_FS
 105 #include <linux/proc_fs.h>
 106 #include <linux/seq_file.h>
 107 #endif
 108
 109 #define IP_MAX_MEMBERSHIPS      20
 110 #define IP_MAX_MSF              10
 111
 112 #ifdef CONFIG_IP_MULTICAST
 113 /* Parameter names and values are taken from igmp-v2-06 draft */
 114
 115 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 116 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 117 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 118 #define IGMP_Query_Response_Interval            (10*HZ)
 119 #define IGMP_Unsolicited_Report_Count           2
 120
 121
 122 #define IGMP_Initial_Report_Delay               (1)
 123
 124 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 125  * IGMP specs require to report membership immediately after
 126  * joining a group, but we delay the first report by a
 127  * small interval. It seems more natural and still does not
 128  * contradict to specs provided this delay is small enough.
 129  */
 130
 131 #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \
 132                 (in_dev)->cnf.force_igmp_version == 1 || \
 133                 ((in_dev)->mr_v1_seen && \
 134                 time_before(jiffies, (in_dev)->mr_v1_seen)))
 135 #define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \
 136                 (in_dev)->cnf.force_igmp_version == 2 || \
 137                 ((in_dev)->mr_v2_seen && \
 138                 time_before(jiffies, (in_dev)->mr_v2_seen)))
 139
 140 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 141 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 142 static void igmpv3_clear_delrec(struct in_device *in_dev);
 143 static int sf_setstate(struct ip_mc_list *pmc);
 144 static void sf_markstate(struct ip_mc_list *pmc);
 145 #endif
 146 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 147 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 148                          int sfcount, __be32 *psfsrc, int delta);
 149
 150 static void ip_ma_put(struct ip_mc_list *im)
 151 {
 152         if (atomic_dec_and_test(&im->refcnt)) {
 153                 in_dev_put(im->interface);
 154                 kfree(im);
 155         }
 156 }
 157
 158 #ifdef CONFIG_IP_MULTICAST
 159
 160 /*
 161  *      Timer management
 162  */
 163
 164 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 165 {
 166         spin_lock_bh(&im->lock);
 167         if (del_timer(&im->timer))
 168                 atomic_dec(&im->refcnt);
 169         im->tm_running=0;
 170         im->reporter = 0;
 171         im->unsolicit_count = 0;
 172         spin_unlock_bh(&im->lock);
 173 }
 174
 175 /* It must be called with locked im->lock */
 176 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 177 {
 178         int tv=net_random() % max_delay;
 179
 180         im->tm_running=1;
 181         if (!mod_timer(&im->timer, jiffies+tv+2))
 182                 atomic_inc(&im->refcnt);
 183 }
 184
 185 static void igmp_gq_start_timer(struct in_device *in_dev)
 186 {
 187         int tv = net_random() % in_dev->mr_maxdelay;
 188
 189         in_dev->mr_gq_running = 1;
 190         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 191                 in_dev_hold(in_dev);
 192 }
 193
 194 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 195 {
 196         int tv = net_random() % delay;
 197
 198         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 199                 in_dev_hold(in_dev);
 200 }
 201
 202 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 203 {
 204         spin_lock_bh(&im->lock);
 205         im->unsolicit_count = 0;
 206         if (del_timer(&im->timer)) {
 207                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 208                         add_timer(&im->timer);
 209                         im->tm_running=1;
 210                         spin_unlock_bh(&im->lock);
 211                         return;
 212                 }
 213                 atomic_dec(&im->refcnt);
 214         }
 215         igmp_start_timer(im, max_delay);
 216         spin_unlock_bh(&im->lock);
 217 }
 218
 219
 220 /*
 221  *      Send an IGMP report.
 222  */
 223
 224 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 225
 226
 227 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 228         int gdeleted, int sdeleted)
 229 {
 230         switch (type) {
 231         case IGMPV3_MODE_IS_INCLUDE:
 232         case IGMPV3_MODE_IS_EXCLUDE:
 233                 if (gdeleted || sdeleted)
 234                         return 0;
 235                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 236                         if (pmc->sfmode == MCAST_INCLUDE)
 237                                 return 1;
 238                         /* don't include if this source is excluded
 239                          * in all filters
 240                          */
 241                         if (psf->sf_count[MCAST_INCLUDE])
 242                                 return type == IGMPV3_MODE_IS_INCLUDE;
 243                         return pmc->sfcount[MCAST_EXCLUDE] ==
 244                                 psf->sf_count[MCAST_EXCLUDE];
 245                 }
 246                 return 0;
 247         case IGMPV3_CHANGE_TO_INCLUDE:
 248                 if (gdeleted || sdeleted)
 249                         return 0;
 250                 return psf->sf_count[MCAST_INCLUDE] != 0;
 251         case IGMPV3_CHANGE_TO_EXCLUDE:
 252                 if (gdeleted || sdeleted)
 253                         return 0;
 254                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 255                     psf->sf_count[MCAST_INCLUDE])
 256                         return 0;
 257                 return pmc->sfcount[MCAST_EXCLUDE] ==
 258                         psf->sf_count[MCAST_EXCLUDE];
 259         case IGMPV3_ALLOW_NEW_SOURCES:
 260                 if (gdeleted || !psf->sf_crcount)
 261                         return 0;
 262                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 263         case IGMPV3_BLOCK_OLD_SOURCES:
 264                 if (pmc->sfmode == MCAST_INCLUDE)
 265                         return gdeleted || (psf->sf_crcount && sdeleted);
 266                 return psf->sf_crcount && !gdeleted && !sdeleted;
 267         }
 268         return 0;
 269 }
 270
 271 static int
 272 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 273 {
 274         struct ip_sf_list *psf;
 275         int scount = 0;
 276
 277         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 278                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 279                         continue;
 280                 scount++;
 281         }
 282         return scount;
 283 }
 284
 285 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 286 {
 287         struct sk_buff *skb;
 288         struct rtable *rt;
 289         struct iphdr *pip;
 290         struct igmpv3_report *pig;
 291
 292         skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 293         if (skb == NULL)
 294                 return NULL;
 295
 296         {
 297                 struct flowi fl = { .oif = dev->ifindex,
 298                                     .nl_u = { .ip4_u = {
 299                                     .daddr = IGMPV3_ALL_MCR } },
 300                                     .proto = IPPROTO_IGMP };
 301                 if (ip_route_output_key(&rt, &fl)) {
 302                         kfree_skb(skb);
 303                         return NULL;
 304                 }
 305         }
 306         if (rt->rt_src == 0) {
 307                 kfree_skb(skb);
 308                 ip_rt_put(rt);
 309                 return NULL;
 310         }
 311
 312         skb->dst = &rt->u.dst;
 313         skb->dev = dev;
 314
 315         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 316
 317         skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
 318
 319         pip->version  = 4;
 320         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 321         pip->tos      = 0xc0;
 322         pip->frag_off = htons(IP_DF);
 323         pip->ttl      = 1;
 324         pip->daddr    = rt->rt_dst;
 325         pip->saddr    = rt->rt_src;
 326         pip->protocol = IPPROTO_IGMP;
 327         pip->tot_len  = 0;      /* filled in later */
 328         ip_select_ident(pip, &rt->u.dst, NULL);
 329         ((u8*)&pip[1])[0] = IPOPT_RA;
 330         ((u8*)&pip[1])[1] = 4;
 331         ((u8*)&pip[1])[2] = 0;
 332         ((u8*)&pip[1])[3] = 0;
 333
 334         pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig));
 335         skb->h.igmph = (struct igmphdr *)pig;
 336         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 337         pig->resv1 = 0;
 338         pig->csum = 0;
 339         pig->resv2 = 0;
 340         pig->ngrec = 0;
 341         return skb;
 342 }
 343
 344 static int igmpv3_sendpack(struct sk_buff *skb)
 345 {
 346         struct iphdr *pip = skb->nh.iph;
 347         struct igmphdr *pig = skb->h.igmph;
 348         int iplen, igmplen;
 349
 350         iplen = skb->tail - (unsigned char *)skb->nh.iph;
 351         pip->tot_len = htons(iplen);
 352         ip_send_check(pip);
 353
 354         igmplen = skb->tail - (unsigned char *)skb->h.igmph;
 355         pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen);
 356
 357         return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
 358                        dst_output);
 359 }
 360
 361 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 362 {
 363         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
 364 }
 365
 366 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 367         int type, struct igmpv3_grec **ppgr)
 368 {
 369         struct net_device *dev = pmc->interface->dev;
 370         struct igmpv3_report *pih;
 371         struct igmpv3_grec *pgr;
 372
 373         if (!skb)
 374                 skb = igmpv3_newpack(dev, dev->mtu);
 375         if (!skb)
 376                 return NULL;
 377         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 378         pgr->grec_type = type;
 379         pgr->grec_auxwords = 0;
 380         pgr->grec_nsrcs = 0;
 381         pgr->grec_mca = pmc->multiaddr;
 382         pih = (struct igmpv3_report *)skb->h.igmph;
 383         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 384         *ppgr = pgr;
 385         return skb;
 386 }
 387
 388 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 389         skb_tailroom(skb)) : 0)
 390
 391 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 392         int type, int gdeleted, int sdeleted)
 393 {
 394         struct net_device *dev = pmc->interface->dev;
 395         struct igmpv3_report *pih;
 396         struct igmpv3_grec *pgr = NULL;
 397         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 398         int scount, stotal, first, isquery, truncate;
 399
 400         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 401                 return skb;
 402
 403         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 404                   type == IGMPV3_MODE_IS_EXCLUDE;
 405         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 406                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 407
 408         stotal = scount = 0;
 409
 410         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 411
 412         if (!*psf_list)
 413                 goto empty_source;
 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         psf_prev = NULL;
 428         for (psf=*psf_list; psf; psf=psf_next) {
 429                 __be32 *psrc;
 430
 431                 psf_next = psf->sf_next;
 432
 433                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 434                         psf_prev = psf;
 435                         continue;
 436                 }
 437
 438                 /* clear marks on query responses */
 439                 if (isquery)
 440                         psf->sf_gsresp = 0;
 441
 442                 if (AVAILABLE(skb) < sizeof(__be32) +
 443                     first*sizeof(struct igmpv3_grec)) {
 444                         if (truncate && !first)
 445                                 break;   /* truncate these */
 446                         if (pgr)
 447                                 pgr->grec_nsrcs = htons(scount);
 448                         if (skb)
 449                                 igmpv3_sendpack(skb);
 450                         skb = igmpv3_newpack(dev, dev->mtu);
 451                         first = 1;
 452                         scount = 0;
 453                 }
 454                 if (first) {
 455                         skb = add_grhead(skb, pmc, type, &pgr);
 456                         first = 0;
 457                 }
 458                 if (!skb)
 459                         return NULL;
 460                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 461                 *psrc = psf->sf_inaddr;
 462                 scount++; stotal++;
 463                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 464                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 465                         psf->sf_crcount--;
 466                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 467                                 if (psf_prev)
 468                                         psf_prev->sf_next = psf->sf_next;
 469                                 else
 470                                         *psf_list = psf->sf_next;
 471                                 kfree(psf);
 472                                 continue;
 473                         }
 474                 }
 475                 psf_prev = psf;
 476         }
 477
 478 empty_source:
 479         if (!stotal) {
 480                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 481                     type == IGMPV3_BLOCK_OLD_SOURCES)
 482                         return skb;
 483                 if (pmc->crcount || isquery) {
 484                         /* make sure we have room for group header */
 485                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 486                                 igmpv3_sendpack(skb);
 487                                 skb = NULL; /* add_grhead will get a new one */
 488                         }
 489                         skb = add_grhead(skb, pmc, type, &pgr);
 490                 }
 491         }
 492         if (pgr)
 493                 pgr->grec_nsrcs = htons(scount);
 494
 495         if (isquery)
 496                 pmc->gsquery = 0;       /* clear query state on report */
 497         return skb;
 498 }
 499
 500 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 501 {
 502         struct sk_buff *skb = NULL;
 503         int type;
 504
 505         if (!pmc) {
 506                 read_lock(&in_dev->mc_list_lock);
 507                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 508                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 509                                 continue;
 510                         spin_lock_bh(&pmc->lock);
 511                         if (pmc->sfcount[MCAST_EXCLUDE])
 512                                 type = IGMPV3_MODE_IS_EXCLUDE;
 513                         else
 514                                 type = IGMPV3_MODE_IS_INCLUDE;
 515                         skb = add_grec(skb, pmc, type, 0, 0);
 516                         spin_unlock_bh(&pmc->lock);
 517                 }
 518                 read_unlock(&in_dev->mc_list_lock);
 519         } else {
 520                 spin_lock_bh(&pmc->lock);
 521                 if (pmc->sfcount[MCAST_EXCLUDE])
 522                         type = IGMPV3_MODE_IS_EXCLUDE;
 523                 else
 524                         type = IGMPV3_MODE_IS_INCLUDE;
 525                 skb = add_grec(skb, pmc, type, 0, 0);
 526                 spin_unlock_bh(&pmc->lock);
 527         }
 528         if (!skb)
 529                 return 0;
 530         return igmpv3_sendpack(skb);
 531 }
 532
 533 /*
 534  * remove zero-count source records from a source filter list
 535  */
 536 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 537 {
 538         struct ip_sf_list *psf_prev, *psf_next, *psf;
 539
 540         psf_prev = NULL;
 541         for (psf=*ppsf; psf; psf = psf_next) {
 542                 psf_next = psf->sf_next;
 543                 if (psf->sf_crcount == 0) {
 544                         if (psf_prev)
 545                                 psf_prev->sf_next = psf->sf_next;
 546                         else
 547                                 *ppsf = psf->sf_next;
 548                         kfree(psf);
 549                 } else
 550                         psf_prev = psf;
 551         }
 552 }
 553
 554 static void igmpv3_send_cr(struct in_device *in_dev)
 555 {
 556         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 557         struct sk_buff *skb = NULL;
 558         int type, dtype;
 559
 560         read_lock(&in_dev->mc_list_lock);
 561         spin_lock_bh(&in_dev->mc_tomb_lock);
 562
 563         /* deleted MCA's */
 564         pmc_prev = NULL;
 565         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 566                 pmc_next = pmc->next;
 567                 if (pmc->sfmode == MCAST_INCLUDE) {
 568                         type = IGMPV3_BLOCK_OLD_SOURCES;
 569                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 570                         skb = add_grec(skb, pmc, type, 1, 0);
 571                         skb = add_grec(skb, pmc, dtype, 1, 1);
 572                 }
 573                 if (pmc->crcount) {
 574                         if (pmc->sfmode == MCAST_EXCLUDE) {
 575                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 576                                 skb = add_grec(skb, pmc, type, 1, 0);
 577                         }
 578                         pmc->crcount--;
 579                         if (pmc->crcount == 0) {
 580                                 igmpv3_clear_zeros(&pmc->tomb);
 581                                 igmpv3_clear_zeros(&pmc->sources);
 582                         }
 583                 }
 584                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 585                         if (pmc_prev)
 586                                 pmc_prev->next = pmc_next;
 587                         else
 588                                 in_dev->mc_tomb = pmc_next;
 589                         in_dev_put(pmc->interface);
 590                         kfree(pmc);
 591                 } else
 592                         pmc_prev = pmc;
 593         }
 594         spin_unlock_bh(&in_dev->mc_tomb_lock);
 595
 596         /* change recs */
 597         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 598                 spin_lock_bh(&pmc->lock);
 599                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 600                         type = IGMPV3_BLOCK_OLD_SOURCES;
 601                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 602                 } else {
 603                         type = IGMPV3_ALLOW_NEW_SOURCES;
 604                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 605                 }
 606                 skb = add_grec(skb, pmc, type, 0, 0);
 607                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 608
 609                 /* filter mode changes */
 610                 if (pmc->crcount) {
 611                         if (pmc->sfmode == MCAST_EXCLUDE)
 612                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 613                         else
 614                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 615                         skb = add_grec(skb, pmc, type, 0, 0);
 616                         pmc->crcount--;
 617                 }
 618                 spin_unlock_bh(&pmc->lock);
 619         }
 620         read_unlock(&in_dev->mc_list_lock);
 621
 622         if (!skb)
 623                 return;
 624         (void) igmpv3_sendpack(skb);
 625 }
 626
 627 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 628         int type)
 629 {
 630         struct sk_buff *skb;
 631         struct iphdr *iph;
 632         struct igmphdr *ih;
 633         struct rtable *rt;
 634         struct net_device *dev = in_dev->dev;
 635         __be32  group = pmc ? pmc->multiaddr : 0;
 636         __be32  dst;
 637
 638         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 639                 return igmpv3_send_report(in_dev, pmc);
 640         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 641                 dst = IGMP_ALL_ROUTER;
 642         else
 643                 dst = group;
 644
 645         {
 646                 struct flowi fl = { .oif = dev->ifindex,
 647                                     .nl_u = { .ip4_u = { .daddr = dst } },
 648                                     .proto = IPPROTO_IGMP };
 649                 if (ip_route_output_key(&rt, &fl))
 650                         return -1;
 651         }
 652         if (rt->rt_src == 0) {
 653                 ip_rt_put(rt);
 654                 return -1;
 655         }
 656
 657         skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 658         if (skb == NULL) {
 659                 ip_rt_put(rt);
 660                 return -1;
 661         }
 662
 663         skb->dst = &rt->u.dst;
 664
 665         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 666
 667         skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
 668
 669         iph->version  = 4;
 670         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 671         iph->tos      = 0xc0;
 672         iph->frag_off = htons(IP_DF);
 673         iph->ttl      = 1;
 674         iph->daddr    = dst;
 675         iph->saddr    = rt->rt_src;
 676         iph->protocol = IPPROTO_IGMP;
 677         iph->tot_len  = htons(IGMP_SIZE);
 678         ip_select_ident(iph, &rt->u.dst, NULL);
 679         ((u8*)&iph[1])[0] = IPOPT_RA;
 680         ((u8*)&iph[1])[1] = 4;
 681         ((u8*)&iph[1])[2] = 0;
 682         ((u8*)&iph[1])[3] = 0;
 683         ip_send_check(iph);
 684
 685         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 686         ih->type=type;
 687         ih->code=0;
 688         ih->csum=0;
 689         ih->group=group;
 690         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 691
 692         return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
 693                        dst_output);
 694 }
 695
 696 static void igmp_gq_timer_expire(unsigned long data)
 697 {
 698         struct in_device *in_dev = (struct in_device *)data;
 699
 700         in_dev->mr_gq_running = 0;
 701         igmpv3_send_report(in_dev, NULL);
 702         __in_dev_put(in_dev);
 703 }
 704
 705 static void igmp_ifc_timer_expire(unsigned long data)
 706 {
 707         struct in_device *in_dev = (struct in_device *)data;
 708
 709         igmpv3_send_cr(in_dev);
 710         if (in_dev->mr_ifc_count) {
 711                 in_dev->mr_ifc_count--;
 712                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 713         }
 714         __in_dev_put(in_dev);
 715 }
 716
 717 static void igmp_ifc_event(struct in_device *in_dev)
 718 {
 719         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 720                 return;
 721         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 722                 IGMP_Unsolicited_Report_Count;
 723         igmp_ifc_start_timer(in_dev, 1);
 724 }
 725
 726
 727 static void igmp_timer_expire(unsigned long data)
 728 {
 729         struct ip_mc_list *im=(struct ip_mc_list *)data;
 730         struct in_device *in_dev = im->interface;
 731
 732         spin_lock(&im->lock);
 733         im->tm_running=0;
 734
 735         if (im->unsolicit_count) {
 736                 im->unsolicit_count--;
 737                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 738         }
 739         im->reporter = 1;
 740         spin_unlock(&im->lock);
 741
 742         if (IGMP_V1_SEEN(in_dev))
 743                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 744         else if (IGMP_V2_SEEN(in_dev))
 745                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 746         else
 747                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 748
 749         ip_ma_put(im);
 750 }
 751
 752 /* mark EXCLUDE-mode sources */
 753 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 754 {
 755         struct ip_sf_list *psf;
 756         int i, scount;
 757
 758         scount = 0;
 759         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 760                 if (scount == nsrcs)
 761                         break;
 762                 for (i=0; i<nsrcs; i++) {
 763                         /* skip inactive filters */
 764                         if (pmc->sfcount[MCAST_INCLUDE] ||
 765                             pmc->sfcount[MCAST_EXCLUDE] !=
 766                             psf->sf_count[MCAST_EXCLUDE])
 767                                 continue;
 768                         if (srcs[i] == psf->sf_inaddr) {
 769                                 scount++;
 770                                 break;
 771                         }
 772                 }
 773         }
 774         pmc->gsquery = 0;
 775         if (scount == nsrcs)    /* all sources excluded */
 776                 return 0;
 777         return 1;
 778 }
 779
 780 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 781 {
 782         struct ip_sf_list *psf;
 783         int i, scount;
 784
 785         if (pmc->sfmode == MCAST_EXCLUDE)
 786                 return igmp_xmarksources(pmc, nsrcs, srcs);
 787
 788         /* mark INCLUDE-mode sources */
 789         scount = 0;
 790         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 791                 if (scount == nsrcs)
 792                         break;
 793                 for (i=0; i<nsrcs; i++)
 794                         if (srcs[i] == psf->sf_inaddr) {
 795                                 psf->sf_gsresp = 1;
 796                                 scount++;
 797                                 break;
 798                         }
 799         }
 800         if (!scount) {
 801                 pmc->gsquery = 0;
 802                 return 0;
 803         }
 804         pmc->gsquery = 1;
 805         return 1;
 806 }
 807
 808 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 809 {
 810         struct ip_mc_list *im;
 811
 812         /* Timers are only set for non-local groups */
 813
 814         if (group == IGMP_ALL_HOSTS)
 815                 return;
 816
 817         read_lock(&in_dev->mc_list_lock);
 818         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 819                 if (im->multiaddr == group) {
 820                         igmp_stop_timer(im);
 821                         break;
 822                 }
 823         }
 824         read_unlock(&in_dev->mc_list_lock);
 825 }
 826
 827 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 828         int len)
 829 {
 830         struct igmphdr          *ih = skb->h.igmph;
 831         struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
 832         struct ip_mc_list       *im;
 833         __be32                  group = ih->group;
 834         int                     max_delay;
 835         int                     mark = 0;
 836
 837
 838         if (len == 8) {
 839                 if (ih->code == 0) {
 840                         /* Alas, old v1 router presents here. */
 841
 842                         max_delay = IGMP_Query_Response_Interval;
 843                         in_dev->mr_v1_seen = jiffies +
 844                                 IGMP_V1_Router_Present_Timeout;
 845                         group = 0;
 846                 } else {
 847                         /* v2 router present */
 848                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 849                         in_dev->mr_v2_seen = jiffies +
 850                                 IGMP_V2_Router_Present_Timeout;
 851                 }
 852                 /* cancel the interface change timer */
 853                 in_dev->mr_ifc_count = 0;
 854                 if (del_timer(&in_dev->mr_ifc_timer))
 855                         __in_dev_put(in_dev);
 856                 /* clear deleted report items */
 857                 igmpv3_clear_delrec(in_dev);
 858         } else if (len < 12) {
 859                 return; /* ignore bogus packet; freed by caller */
 860         } else { /* v3 */
 861                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 862                         return;
 863
 864                 ih3 = (struct igmpv3_query *) skb->h.raw;
 865                 if (ih3->nsrcs) {
 866                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 867                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 868                                 return;
 869                         ih3 = (struct igmpv3_query *) skb->h.raw;
 870                 }
 871
 872                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 873                 if (!max_delay)
 874                         max_delay = 1;  /* can't mod w/ 0 */
 875                 in_dev->mr_maxdelay = max_delay;
 876                 if (ih3->qrv)
 877                         in_dev->mr_qrv = ih3->qrv;
 878                 if (!group) { /* general query */
 879                         if (ih3->nsrcs)
 880                                 return; /* no sources allowed */
 881                         igmp_gq_start_timer(in_dev);
 882                         return;
 883                 }
 884                 /* mark sources to include, if group & source-specific */
 885                 mark = ih3->nsrcs != 0;
 886         }
 887
 888         /*
 889          * - Start the timers in all of our membership records
 890          *   that the query applies to for the interface on
 891          *   which the query arrived excl. those that belong
 892          *   to a "local" group (224.0.0.X)
 893          * - For timers already running check if they need to
 894          *   be reset.
 895          * - Use the igmp->igmp_code field as the maximum
 896          *   delay possible
 897          */
 898         read_lock(&in_dev->mc_list_lock);
 899         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 900                 int changed;
 901
 902                 if (group && group != im->multiaddr)
 903                         continue;
 904                 if (im->multiaddr == IGMP_ALL_HOSTS)
 905                         continue;
 906                 spin_lock_bh(&im->lock);
 907                 if (im->tm_running)
 908                         im->gsquery = im->gsquery && mark;
 909                 else
 910                         im->gsquery = mark;
 911                 changed = !im->gsquery ||
 912                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 913                 spin_unlock_bh(&im->lock);
 914                 if (changed)
 915                         igmp_mod_timer(im, max_delay);
 916         }
 917         read_unlock(&in_dev->mc_list_lock);
 918 }
 919
 920 int igmp_rcv(struct sk_buff *skb)
 921 {
 922         /* This basically follows the spec line by line -- see RFC1112 */
 923         struct igmphdr *ih;
 924         struct in_device *in_dev = in_dev_get(skb->dev);
 925         int len = skb->len;
 926
 927         if (in_dev==NULL) {
 928                 kfree_skb(skb);
 929                 return 0;
 930         }
 931
 932         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 933                 goto drop;
 934
 935         switch (skb->ip_summed) {
 936         case CHECKSUM_COMPLETE:
 937                 if (!csum_fold(skb->csum))
 938                         break;
 939                 /* fall through */
 940         case CHECKSUM_NONE:
 941                 skb->csum = 0;
 942                 if (__skb_checksum_complete(skb))
 943                         goto drop;
 944         }
 945
 946         ih = skb->h.igmph;
 947         switch (ih->type) {
 948         case IGMP_HOST_MEMBERSHIP_QUERY:
 949                 igmp_heard_query(in_dev, skb, len);
 950                 break;
 951         case IGMP_HOST_MEMBERSHIP_REPORT:
 952         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 953         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 954                 /* Is it our report looped back? */
 955                 if (((struct rtable*)skb->dst)->fl.iif == 0)
 956                         break;
 957                 /* don't rely on MC router hearing unicast reports */
 958                 if (skb->pkt_type == PACKET_MULTICAST ||
 959                     skb->pkt_type == PACKET_BROADCAST)
 960                         igmp_heard_report(in_dev, ih->group);
 961                 break;
 962         case IGMP_PIM:
 963 #ifdef CONFIG_IP_PIMSM_V1
 964                 in_dev_put(in_dev);
 965                 return pim_rcv_v1(skb);
 966 #endif
 967         case IGMP_DVMRP:
 968         case IGMP_TRACE:
 969         case IGMP_HOST_LEAVE_MESSAGE:
 970         case IGMP_MTRACE:
 971         case IGMP_MTRACE_RESP:
 972                 break;
 973         default:
 974                 break;
 975         }
 976
 977 drop:
 978         in_dev_put(in_dev);
 979         kfree_skb(skb);
 980         return 0;
 981 }
 982
 983 #endif
 984
 985
 986 /*
 987  *      Add a filter to a device
 988  */
 989
 990 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 991 {
 992         char buf[MAX_ADDR_LEN];
 993         struct net_device *dev = in_dev->dev;
 994
 995         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 996            We will get multicast token leakage, when IFF_MULTICAST
 997            is changed. This check should be done in dev->set_multicast_list
 998            routine. Something sort of:
 999            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1000            --ANK
1001            */
1002         if (arp_mc_map(addr, buf, dev, 0) == 0)
1003                 dev_mc_add(dev,buf,dev->addr_len,0);
1004 }
1005
1006 /*
1007  *      Remove a filter from a device
1008  */
1009
1010 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1011 {
1012         char buf[MAX_ADDR_LEN];
1013         struct net_device *dev = in_dev->dev;
1014
1015         if (arp_mc_map(addr, buf, dev, 0) == 0)
1016                 dev_mc_delete(dev,buf,dev->addr_len,0);
1017 }
1018
1019 #ifdef CONFIG_IP_MULTICAST
1020 /*
1021  * deleted ip_mc_list manipulation
1022  */
1023 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1024 {
1025         struct ip_mc_list *pmc;
1026
1027         /* this is an "ip_mc_list" for convenience; only the fields below
1028          * are actually used. In particular, the refcnt and users are not
1029          * used for management of the delete list. Using the same structure
1030          * for deleted items allows change reports to use common code with
1031          * non-deleted or query-response MCA's.
1032          */
1033         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1034         if (!pmc)
1035                 return;
1036         spin_lock_bh(&im->lock);
1037         pmc->interface = im->interface;
1038         in_dev_hold(in_dev);
1039         pmc->multiaddr = im->multiaddr;
1040         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1041                 IGMP_Unsolicited_Report_Count;
1042         pmc->sfmode = im->sfmode;
1043         if (pmc->sfmode == MCAST_INCLUDE) {
1044                 struct ip_sf_list *psf;
1045
1046                 pmc->tomb = im->tomb;
1047                 pmc->sources = im->sources;
1048                 im->tomb = im->sources = NULL;
1049                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1050                         psf->sf_crcount = pmc->crcount;
1051         }
1052         spin_unlock_bh(&im->lock);
1053
1054         spin_lock_bh(&in_dev->mc_tomb_lock);
1055         pmc->next = in_dev->mc_tomb;
1056         in_dev->mc_tomb = pmc;
1057         spin_unlock_bh(&in_dev->mc_tomb_lock);
1058 }
1059
1060 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1061 {
1062         struct ip_mc_list *pmc, *pmc_prev;
1063         struct ip_sf_list *psf, *psf_next;
1064
1065         spin_lock_bh(&in_dev->mc_tomb_lock);
1066         pmc_prev = NULL;
1067         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1068                 if (pmc->multiaddr == multiaddr)
1069                         break;
1070                 pmc_prev = pmc;
1071         }
1072         if (pmc) {
1073                 if (pmc_prev)
1074                         pmc_prev->next = pmc->next;
1075                 else
1076                         in_dev->mc_tomb = pmc->next;
1077         }
1078         spin_unlock_bh(&in_dev->mc_tomb_lock);
1079         if (pmc) {
1080                 for (psf=pmc->tomb; psf; psf=psf_next) {
1081                         psf_next = psf->sf_next;
1082                         kfree(psf);
1083                 }
1084                 in_dev_put(pmc->interface);
1085                 kfree(pmc);
1086         }
1087 }
1088
1089 static void igmpv3_clear_delrec(struct in_device *in_dev)
1090 {
1091         struct ip_mc_list *pmc, *nextpmc;
1092
1093         spin_lock_bh(&in_dev->mc_tomb_lock);
1094         pmc = in_dev->mc_tomb;
1095         in_dev->mc_tomb = NULL;
1096         spin_unlock_bh(&in_dev->mc_tomb_lock);
1097
1098         for (; pmc; pmc = nextpmc) {
1099                 nextpmc = pmc->next;
1100                 ip_mc_clear_src(pmc);
1101                 in_dev_put(pmc->interface);
1102                 kfree(pmc);
1103         }
1104         /* clear dead sources, too */
1105         read_lock(&in_dev->mc_list_lock);
1106         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1107                 struct ip_sf_list *psf, *psf_next;
1108
1109                 spin_lock_bh(&pmc->lock);
1110                 psf = pmc->tomb;
1111                 pmc->tomb = NULL;
1112                 spin_unlock_bh(&pmc->lock);
1113                 for (; psf; psf=psf_next) {
1114                         psf_next = psf->sf_next;
1115                         kfree(psf);
1116                 }
1117         }
1118         read_unlock(&in_dev->mc_list_lock);
1119 }
1120 #endif
1121
1122 static void igmp_group_dropped(struct ip_mc_list *im)
1123 {
1124         struct in_device *in_dev = im->interface;
1125 #ifdef CONFIG_IP_MULTICAST
1126         int reporter;
1127 #endif
1128
1129         if (im->loaded) {
1130                 im->loaded = 0;
1131                 ip_mc_filter_del(in_dev, im->multiaddr);
1132         }
1133
1134 #ifdef CONFIG_IP_MULTICAST
1135         if (im->multiaddr == IGMP_ALL_HOSTS)
1136                 return;
1137
1138         reporter = im->reporter;
1139         igmp_stop_timer(im);
1140
1141         if (!in_dev->dead) {
1142                 if (IGMP_V1_SEEN(in_dev))
1143                         goto done;
1144                 if (IGMP_V2_SEEN(in_dev)) {
1145                         if (reporter)
1146                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1147                         goto done;
1148                 }
1149                 /* IGMPv3 */
1150                 igmpv3_add_delrec(in_dev, im);
1151
1152                 igmp_ifc_event(in_dev);
1153         }
1154 done:
1155 #endif
1156         ip_mc_clear_src(im);
1157 }
1158
1159 static void igmp_group_added(struct ip_mc_list *im)
1160 {
1161         struct in_device *in_dev = im->interface;
1162
1163         if (im->loaded == 0) {
1164                 im->loaded = 1;
1165                 ip_mc_filter_add(in_dev, im->multiaddr);
1166         }
1167
1168 #ifdef CONFIG_IP_MULTICAST
1169         if (im->multiaddr == IGMP_ALL_HOSTS)
1170                 return;
1171
1172         if (in_dev->dead)
1173                 return;
1174         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1175                 spin_lock_bh(&im->lock);
1176                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1177                 spin_unlock_bh(&im->lock);
1178                 return;
1179         }
1180         /* else, v3 */
1181
1182         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1183                 IGMP_Unsolicited_Report_Count;
1184         igmp_ifc_event(in_dev);
1185 #endif
1186 }
1187
1188
1189 /*
1190  *      Multicast list managers
1191  */
1192
1193
1194 /*
1195  *      A socket has joined a multicast group on device dev.
1196  */
1197
1198 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1199 {
1200         struct ip_mc_list *im;
1201
1202         ASSERT_RTNL();
1203
1204         for (im=in_dev->mc_list; im; im=im->next) {
1205                 if (im->multiaddr == addr) {
1206                         im->users++;
1207                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1208                         goto out;
1209                 }
1210         }
1211
1212         im = kmalloc(sizeof(*im), GFP_KERNEL);
1213         if (!im)
1214                 goto out;
1215
1216         im->users=1;
1217         im->interface=in_dev;
1218         in_dev_hold(in_dev);
1219         im->multiaddr=addr;
1220         /* initial mode is (EX, empty) */
1221         im->sfmode = MCAST_EXCLUDE;
1222         im->sfcount[MCAST_INCLUDE] = 0;
1223         im->sfcount[MCAST_EXCLUDE] = 1;
1224         im->sources = NULL;
1225         im->tomb = NULL;
1226         im->crcount = 0;
1227         atomic_set(&im->refcnt, 1);
1228         spin_lock_init(&im->lock);
1229 #ifdef CONFIG_IP_MULTICAST
1230         im->tm_running=0;
1231         init_timer(&im->timer);
1232         im->timer.data=(unsigned long)im;
1233         im->timer.function=&igmp_timer_expire;
1234         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1235         im->reporter = 0;
1236         im->gsquery = 0;
1237 #endif
1238         im->loaded = 0;
1239         write_lock_bh(&in_dev->mc_list_lock);
1240         im->next=in_dev->mc_list;
1241         in_dev->mc_list=im;
1242         write_unlock_bh(&in_dev->mc_list_lock);
1243 #ifdef CONFIG_IP_MULTICAST
1244         igmpv3_del_delrec(in_dev, im->multiaddr);
1245 #endif
1246         igmp_group_added(im);
1247         if (!in_dev->dead)
1248                 ip_rt_multicast_event(in_dev);
1249 out:
1250         return;
1251 }
1252
1253 /*
1254  *      A socket has left a multicast group on device dev
1255  */
1256
1257 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1258 {
1259         struct ip_mc_list *i, **ip;
1260
1261         ASSERT_RTNL();
1262
1263         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1264                 if (i->multiaddr==addr) {
1265                         if (--i->users == 0) {
1266                                 write_lock_bh(&in_dev->mc_list_lock);
1267                                 *ip = i->next;
1268                                 write_unlock_bh(&in_dev->mc_list_lock);
1269                                 igmp_group_dropped(i);
1270
1271                                 if (!in_dev->dead)
1272                                         ip_rt_multicast_event(in_dev);
1273
1274                                 ip_ma_put(i);
1275                                 return;
1276                         }
1277                         break;
1278                 }
1279         }
1280 }
1281
1282 /* Device going down */
1283
1284 void ip_mc_down(struct in_device *in_dev)
1285 {
1286         struct ip_mc_list *i;
1287
1288         ASSERT_RTNL();
1289
1290         for (i=in_dev->mc_list; i; i=i->next)
1291                 igmp_group_dropped(i);
1292
1293 #ifdef CONFIG_IP_MULTICAST
1294         in_dev->mr_ifc_count = 0;
1295         if (del_timer(&in_dev->mr_ifc_timer))
1296                 __in_dev_put(in_dev);
1297         in_dev->mr_gq_running = 0;
1298         if (del_timer(&in_dev->mr_gq_timer))
1299                 __in_dev_put(in_dev);
1300         igmpv3_clear_delrec(in_dev);
1301 #endif
1302
1303         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1304 }
1305
1306 void ip_mc_init_dev(struct in_device *in_dev)
1307 {
1308         ASSERT_RTNL();
1309
1310         in_dev->mc_tomb = NULL;
1311 #ifdef CONFIG_IP_MULTICAST
1312         in_dev->mr_gq_running = 0;
1313         init_timer(&in_dev->mr_gq_timer);
1314         in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1315         in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1316         in_dev->mr_ifc_count = 0;
1317         init_timer(&in_dev->mr_ifc_timer);
1318         in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1319         in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1320         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1321 #endif
1322
1323         rwlock_init(&in_dev->mc_list_lock);
1324         spin_lock_init(&in_dev->mc_tomb_lock);
1325 }
1326
1327 /* Device going up */
1328
1329 void ip_mc_up(struct in_device *in_dev)
1330 {
1331         struct ip_mc_list *i;
1332
1333         ASSERT_RTNL();
1334
1335         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1336
1337         for (i=in_dev->mc_list; i; i=i->next)
1338                 igmp_group_added(i);
1339 }
1340
1341 /*
1342  *      Device is about to be destroyed: clean up.
1343  */
1344
1345 void ip_mc_destroy_dev(struct in_device *in_dev)
1346 {
1347         struct ip_mc_list *i;
1348
1349         ASSERT_RTNL();
1350
1351         /* Deactivate timers */
1352         ip_mc_down(in_dev);
1353
1354         write_lock_bh(&in_dev->mc_list_lock);
1355         while ((i = in_dev->mc_list) != NULL) {
1356                 in_dev->mc_list = i->next;
1357                 write_unlock_bh(&in_dev->mc_list_lock);
1358
1359                 igmp_group_dropped(i);
1360                 ip_ma_put(i);
1361
1362                 write_lock_bh(&in_dev->mc_list_lock);
1363         }
1364         write_unlock_bh(&in_dev->mc_list_lock);
1365 }
1366
1367 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1368 {
1369         struct flowi fl = { .nl_u = { .ip4_u =
1370                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1371         struct rtable *rt;
1372         struct net_device *dev = NULL;
1373         struct in_device *idev = NULL;
1374
1375         if (imr->imr_ifindex) {
1376                 idev = inetdev_by_index(imr->imr_ifindex);
1377                 if (idev)
1378                         __in_dev_put(idev);
1379                 return idev;
1380         }
1381         if (imr->imr_address.s_addr) {
1382                 dev = ip_dev_find(imr->imr_address.s_addr);
1383                 if (!dev)
1384                         return NULL;
1385                 dev_put(dev);
1386         }
1387
1388         if (!dev && !ip_route_output_key(&rt, &fl)) {
1389                 dev = rt->u.dst.dev;
1390                 ip_rt_put(rt);
1391         }
1392         if (dev) {
1393                 imr->imr_ifindex = dev->ifindex;
1394                 idev = __in_dev_get_rtnl(dev);
1395         }
1396         return idev;
1397 }
1398
1399 /*
1400  *      Join a socket to a group
1401  */
1402 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1403 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1404
1405
1406 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1407         __be32 *psfsrc)
1408 {
1409         struct ip_sf_list *psf, *psf_prev;
1410         int rv = 0;
1411
1412         psf_prev = NULL;
1413         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1414                 if (psf->sf_inaddr == *psfsrc)
1415                         break;
1416                 psf_prev = psf;
1417         }
1418         if (!psf || psf->sf_count[sfmode] == 0) {
1419                 /* source filter not found, or count wrong =>  bug */
1420                 return -ESRCH;
1421         }
1422         psf->sf_count[sfmode]--;
1423         if (psf->sf_count[sfmode] == 0) {
1424                 ip_rt_multicast_event(pmc->interface);
1425         }
1426         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1427 #ifdef CONFIG_IP_MULTICAST
1428                 struct in_device *in_dev = pmc->interface;
1429 #endif
1430
1431                 /* no more filters for this source */
1432                 if (psf_prev)
1433                         psf_prev->sf_next = psf->sf_next;
1434                 else
1435                         pmc->sources = psf->sf_next;
1436 #ifdef CONFIG_IP_MULTICAST
1437                 if (psf->sf_oldin &&
1438                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1439                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1440                                 IGMP_Unsolicited_Report_Count;
1441                         psf->sf_next = pmc->tomb;
1442                         pmc->tomb = psf;
1443                         rv = 1;
1444                 } else
1445 #endif
1446                         kfree(psf);
1447         }
1448         return rv;
1449 }
1450
1451 #ifndef CONFIG_IP_MULTICAST
1452 #define igmp_ifc_event(x)       do { } while (0)
1453 #endif
1454
1455 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1456                          int sfcount, __be32 *psfsrc, int delta)
1457 {
1458         struct ip_mc_list *pmc;
1459         int     changerec = 0;
1460         int     i, err;
1461
1462         if (!in_dev)
1463                 return -ENODEV;
1464         read_lock(&in_dev->mc_list_lock);
1465         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1466                 if (*pmca == pmc->multiaddr)
1467                         break;
1468         }
1469         if (!pmc) {
1470                 /* MCA not found?? bug */
1471                 read_unlock(&in_dev->mc_list_lock);
1472                 return -ESRCH;
1473         }
1474         spin_lock_bh(&pmc->lock);
1475         read_unlock(&in_dev->mc_list_lock);
1476 #ifdef CONFIG_IP_MULTICAST
1477         sf_markstate(pmc);
1478 #endif
1479         if (!delta) {
1480                 err = -EINVAL;
1481                 if (!pmc->sfcount[sfmode])
1482                         goto out_unlock;
1483                 pmc->sfcount[sfmode]--;
1484         }
1485         err = 0;
1486         for (i=0; i<sfcount; i++) {
1487                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1488
1489                 changerec |= rv > 0;
1490                 if (!err && rv < 0)
1491                         err = rv;
1492         }
1493         if (pmc->sfmode == MCAST_EXCLUDE &&
1494             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1495             pmc->sfcount[MCAST_INCLUDE]) {
1496 #ifdef CONFIG_IP_MULTICAST
1497                 struct ip_sf_list *psf;
1498 #endif
1499
1500                 /* filter mode change */
1501                 pmc->sfmode = MCAST_INCLUDE;
1502 #ifdef CONFIG_IP_MULTICAST
1503                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1504                         IGMP_Unsolicited_Report_Count;
1505                 in_dev->mr_ifc_count = pmc->crcount;
1506                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1507                         psf->sf_crcount = 0;
1508                 igmp_ifc_event(pmc->interface);
1509         } else if (sf_setstate(pmc) || changerec) {
1510                 igmp_ifc_event(pmc->interface);
1511 #endif
1512         }
1513 out_unlock:
1514         spin_unlock_bh(&pmc->lock);
1515         return err;
1516 }
1517
1518 /*
1519  * Add multicast single-source filter to the interface list
1520  */
1521 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1522         __be32 *psfsrc, int delta)
1523 {
1524         struct ip_sf_list *psf, *psf_prev;
1525
1526         psf_prev = NULL;
1527         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1528                 if (psf->sf_inaddr == *psfsrc)
1529                         break;
1530                 psf_prev = psf;
1531         }
1532         if (!psf) {
1533                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1534                 if (!psf)
1535                         return -ENOBUFS;
1536                 psf->sf_inaddr = *psfsrc;
1537                 if (psf_prev) {
1538                         psf_prev->sf_next = psf;
1539                 } else
1540                         pmc->sources = psf;
1541         }
1542         psf->sf_count[sfmode]++;
1543         if (psf->sf_count[sfmode] == 1) {
1544                 ip_rt_multicast_event(pmc->interface);
1545         }
1546         return 0;
1547 }
1548
1549 #ifdef CONFIG_IP_MULTICAST
1550 static void sf_markstate(struct ip_mc_list *pmc)
1551 {
1552         struct ip_sf_list *psf;
1553         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1554
1555         for (psf=pmc->sources; psf; psf=psf->sf_next)
1556                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1557                         psf->sf_oldin = mca_xcount ==
1558                                 psf->sf_count[MCAST_EXCLUDE] &&
1559                                 !psf->sf_count[MCAST_INCLUDE];
1560                 } else
1561                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1562 }
1563
1564 static int sf_setstate(struct ip_mc_list *pmc)
1565 {
1566         struct ip_sf_list *psf, *dpsf;
1567         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1568         int qrv = pmc->interface->mr_qrv;
1569         int new_in, rv;
1570
1571         rv = 0;
1572         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1573                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1574                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1575                                 !psf->sf_count[MCAST_INCLUDE];
1576                 } else
1577                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1578                 if (new_in) {
1579                         if (!psf->sf_oldin) {
1580                                 struct ip_sf_list *prev = NULL;
1581
1582                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1583                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1584                                                 break;
1585                                         prev = dpsf;
1586                                 }
1587                                 if (dpsf) {
1588                                         if (prev)
1589                                                 prev->sf_next = dpsf->sf_next;
1590                                         else
1591                                                 pmc->tomb = dpsf->sf_next;
1592                                         kfree(dpsf);
1593                                 }
1594                                 psf->sf_crcount = qrv;
1595                                 rv++;
1596                         }
1597                 } else if (psf->sf_oldin) {
1598
1599                         psf->sf_crcount = 0;
1600                         /*
1601                          * add or update "delete" records if an active filter
1602                          * is now inactive
1603                          */
1604                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1605                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1606                                         break;
1607                         if (!dpsf) {
1608                                 dpsf = (struct ip_sf_list *)
1609                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1610                                 if (!dpsf)
1611                                         continue;
1612                                 *dpsf = *psf;
1613                                 /* pmc->lock held by callers */
1614                                 dpsf->sf_next = pmc->tomb;
1615                                 pmc->tomb = dpsf;
1616                         }
1617                         dpsf->sf_crcount = qrv;
1618                         rv++;
1619                 }
1620         }
1621         return rv;
1622 }
1623 #endif
1624
1625 /*
1626  * Add multicast source filter list to the interface list
1627  */
1628 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1629                          int sfcount, __be32 *psfsrc, int delta)
1630 {
1631         struct ip_mc_list *pmc;
1632         int     isexclude;
1633         int     i, err;
1634
1635         if (!in_dev)
1636                 return -ENODEV;
1637         read_lock(&in_dev->mc_list_lock);
1638         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1639                 if (*pmca == pmc->multiaddr)
1640                         break;
1641         }
1642         if (!pmc) {
1643                 /* MCA not found?? bug */
1644                 read_unlock(&in_dev->mc_list_lock);
1645                 return -ESRCH;
1646         }
1647         spin_lock_bh(&pmc->lock);
1648         read_unlock(&in_dev->mc_list_lock);
1649
1650 #ifdef CONFIG_IP_MULTICAST
1651         sf_markstate(pmc);
1652 #endif
1653         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1654         if (!delta)
1655                 pmc->sfcount[sfmode]++;
1656         err = 0;
1657         for (i=0; i<sfcount; i++) {
1658                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1659                 if (err)
1660                         break;
1661         }
1662         if (err) {
1663                 int j;
1664
1665                 pmc->sfcount[sfmode]--;
1666                 for (j=0; j<i; j++)
1667                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1668         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1669 #ifdef CONFIG_IP_MULTICAST
1670                 struct in_device *in_dev = pmc->interface;
1671                 struct ip_sf_list *psf;
1672 #endif
1673
1674                 /* filter mode change */
1675                 if (pmc->sfcount[MCAST_EXCLUDE])
1676                         pmc->sfmode = MCAST_EXCLUDE;
1677                 else if (pmc->sfcount[MCAST_INCLUDE])
1678                         pmc->sfmode = MCAST_INCLUDE;
1679 #ifdef CONFIG_IP_MULTICAST
1680                 /* else no filters; keep old mode for reports */
1681
1682                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1683                         IGMP_Unsolicited_Report_Count;
1684                 in_dev->mr_ifc_count = pmc->crcount;
1685                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1686                         psf->sf_crcount = 0;
1687                 igmp_ifc_event(in_dev);
1688         } else if (sf_setstate(pmc)) {
1689                 igmp_ifc_event(in_dev);
1690 #endif
1691         }
1692         spin_unlock_bh(&pmc->lock);
1693         return err;
1694 }
1695
1696 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1697 {
1698         struct ip_sf_list *psf, *nextpsf;
1699
1700         for (psf=pmc->tomb; psf; psf=nextpsf) {
1701                 nextpsf = psf->sf_next;
1702                 kfree(psf);
1703         }
1704         pmc->tomb = NULL;
1705         for (psf=pmc->sources; psf; psf=nextpsf) {
1706                 nextpsf = psf->sf_next;
1707                 kfree(psf);
1708         }
1709         pmc->sources = NULL;
1710         pmc->sfmode = MCAST_EXCLUDE;
1711         pmc->sfcount[MCAST_INCLUDE] = 0;
1712         pmc->sfcount[MCAST_EXCLUDE] = 1;
1713 }
1714
1715
1716 /*
1717  * Join a multicast group
1718  */
1719 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1720 {
1721         int err;
1722         __be32 addr = imr->imr_multiaddr.s_addr;
1723         struct ip_mc_socklist *iml=NULL, *i;
1724         struct in_device *in_dev;
1725         struct inet_sock *inet = inet_sk(sk);
1726         int ifindex;
1727         int count = 0;
1728
1729         if (!MULTICAST(addr))
1730                 return -EINVAL;
1731
1732         rtnl_lock();
1733
1734         in_dev = ip_mc_find_dev(imr);
1735
1736         if (!in_dev) {
1737                 iml = NULL;
1738                 err = -ENODEV;
1739                 goto done;
1740         }
1741
1742         err = -EADDRINUSE;
1743         ifindex = imr->imr_ifindex;
1744         for (i = inet->mc_list; i; i = i->next) {
1745                 if (i->multi.imr_multiaddr.s_addr == addr &&
1746                     i->multi.imr_ifindex == ifindex)
1747                         goto done;
1748                 count++;
1749         }
1750         err = -ENOBUFS;
1751         if (count >= sysctl_igmp_max_memberships)
1752                 goto done;
1753         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1754         if (iml == NULL)
1755                 goto done;
1756
1757         memcpy(&iml->multi, imr, sizeof(*imr));
1758         iml->next = inet->mc_list;
1759         iml->sflist = NULL;
1760         iml->sfmode = MCAST_EXCLUDE;
1761         inet->mc_list = iml;
1762         ip_mc_inc_group(in_dev, addr);
1763         err = 0;
1764 done:
1765         rtnl_unlock();
1766         return err;
1767 }
1768
1769 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1770                            struct in_device *in_dev)
1771 {
1772         int err;
1773
1774         if (iml->sflist == 0) {
1775                 /* any-source empty exclude case */
1776                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1777                         iml->sfmode, 0, NULL, 0);
1778         }
1779         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1780                         iml->sfmode, iml->sflist->sl_count,
1781                         iml->sflist->sl_addr, 0);
1782         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1783         iml->sflist = NULL;
1784         return err;
1785 }
1786
1787 /*
1788  *      Ask a socket to leave a group.
1789  */
1790
1791 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1792 {
1793         struct inet_sock *inet = inet_sk(sk);
1794         struct ip_mc_socklist *iml, **imlp;
1795         struct in_device *in_dev;
1796         __be32 group = imr->imr_multiaddr.s_addr;
1797         u32 ifindex;
1798         int ret = -EADDRNOTAVAIL;
1799
1800         rtnl_lock();
1801         in_dev = ip_mc_find_dev(imr);
1802         ifindex = imr->imr_ifindex;
1803         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1804                 if (iml->multi.imr_multiaddr.s_addr != group)
1805                         continue;
1806                 if (ifindex) {
1807                         if (iml->multi.imr_ifindex != ifindex)
1808                                 continue;
1809                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1810                                 iml->multi.imr_address.s_addr)
1811                         continue;
1812
1813                 (void) ip_mc_leave_src(sk, iml, in_dev);
1814
1815                 *imlp = iml->next;
1816
1817                 if (in_dev)
1818                         ip_mc_dec_group(in_dev, group);
1819                 rtnl_unlock();
1820                 sock_kfree_s(sk, iml, sizeof(*iml));
1821                 return 0;
1822         }
1823         if (!in_dev)
1824                 ret = -ENODEV;
1825         rtnl_unlock();
1826         return ret;
1827 }
1828
1829 int ip_mc_source(int add, int omode, struct sock *sk, struct
1830         ip_mreq_source *mreqs, int ifindex)
1831 {
1832         int err;
1833         struct ip_mreqn imr;
1834         __be32 addr = mreqs->imr_multiaddr;
1835         struct ip_mc_socklist *pmc;
1836         struct in_device *in_dev = NULL;
1837         struct inet_sock *inet = inet_sk(sk);
1838         struct ip_sf_socklist *psl;
1839         int leavegroup = 0;
1840         int i, j, rv;
1841
1842         if (!MULTICAST(addr))
1843                 return -EINVAL;
1844
1845         rtnl_lock();
1846
1847         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1848         imr.imr_address.s_addr = mreqs->imr_interface;
1849         imr.imr_ifindex = ifindex;
1850         in_dev = ip_mc_find_dev(&imr);
1851
1852         if (!in_dev) {
1853                 err = -ENODEV;
1854                 goto done;
1855         }
1856         err = -EADDRNOTAVAIL;
1857
1858         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1859                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1860                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1861                         break;
1862         }
1863         if (!pmc) {             /* must have a prior join */
1864                 err = -EINVAL;
1865                 goto done;
1866         }
1867         /* if a source filter was set, must be the same mode as before */
1868         if (pmc->sflist) {
1869                 if (pmc->sfmode != omode) {
1870                         err = -EINVAL;
1871                         goto done;
1872                 }
1873         } else if (pmc->sfmode != omode) {
1874                 /* allow mode switches for empty-set filters */
1875                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1876                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1877                         NULL, 0);
1878                 pmc->sfmode = omode;
1879         }
1880
1881         psl = pmc->sflist;
1882         if (!add) {
1883                 if (!psl)
1884                         goto done;      /* err = -EADDRNOTAVAIL */
1885                 rv = !0;
1886                 for (i=0; i<psl->sl_count; i++) {
1887                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1888                                 sizeof(__be32));
1889                         if (rv == 0)
1890                                 break;
1891                 }
1892                 if (rv)         /* source not found */
1893                         goto done;      /* err = -EADDRNOTAVAIL */
1894
1895                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1896                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1897                         leavegroup = 1;
1898                         goto done;
1899                 }
1900
1901                 /* update the interface filter */
1902                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1903                         &mreqs->imr_sourceaddr, 1);
1904
1905                 for (j=i+1; j<psl->sl_count; j++)
1906                         psl->sl_addr[j-1] = psl->sl_addr[j];
1907                 psl->sl_count--;
1908                 err = 0;
1909                 goto done;
1910         }
1911         /* else, add a new source to the filter */
1912
1913         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1914                 err = -ENOBUFS;
1915                 goto done;
1916         }
1917         if (!psl || psl->sl_count == psl->sl_max) {
1918                 struct ip_sf_socklist *newpsl;
1919                 int count = IP_SFBLOCK;
1920
1921                 if (psl)
1922                         count += psl->sl_max;
1923                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1924                 if (!newpsl) {
1925                         err = -ENOBUFS;
1926                         goto done;
1927                 }
1928                 newpsl->sl_max = count;
1929                 newpsl->sl_count = count - IP_SFBLOCK;
1930                 if (psl) {
1931                         for (i=0; i<psl->sl_count; i++)
1932                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1933                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1934                 }
1935                 pmc->sflist = psl = newpsl;
1936         }
1937         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1938         for (i=0; i<psl->sl_count; i++) {
1939                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1940                         sizeof(__be32));
1941                 if (rv == 0)
1942                         break;
1943         }
1944         if (rv == 0)            /* address already there is an error */
1945                 goto done;
1946         for (j=psl->sl_count-1; j>=i; j--)
1947                 psl->sl_addr[j+1] = psl->sl_addr[j];
1948         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1949         psl->sl_count++;
1950         err = 0;
1951         /* update the interface list */
1952         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1953                 &mreqs->imr_sourceaddr, 1);
1954 done:
1955         rtnl_unlock();
1956         if (leavegroup)
1957                 return ip_mc_leave_group(sk, &imr);
1958         return err;
1959 }
1960
1961 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1962 {
1963         int err = 0;
1964         struct ip_mreqn imr;
1965         __be32 addr = msf->imsf_multiaddr;
1966         struct ip_mc_socklist *pmc;
1967         struct in_device *in_dev;
1968         struct inet_sock *inet = inet_sk(sk);
1969         struct ip_sf_socklist *newpsl, *psl;
1970         int leavegroup = 0;
1971
1972         if (!MULTICAST(addr))
1973                 return -EINVAL;
1974         if (msf->imsf_fmode != MCAST_INCLUDE &&
1975             msf->imsf_fmode != MCAST_EXCLUDE)
1976                 return -EINVAL;
1977
1978         rtnl_lock();
1979
1980         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1981         imr.imr_address.s_addr = msf->imsf_interface;
1982         imr.imr_ifindex = ifindex;
1983         in_dev = ip_mc_find_dev(&imr);
1984
1985         if (!in_dev) {
1986                 err = -ENODEV;
1987                 goto done;
1988         }
1989
1990         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1991         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
1992                 leavegroup = 1;
1993                 goto done;
1994         }
1995
1996         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1997                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1998                     pmc->multi.imr_ifindex == imr.imr_ifindex)
1999                         break;
2000         }
2001         if (!pmc) {             /* must have a prior join */
2002                 err = -EINVAL;
2003                 goto done;
2004         }
2005         if (msf->imsf_numsrc) {
2006                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2007                                                            GFP_KERNEL);
2008                 if (!newpsl) {
2009                         err = -ENOBUFS;
2010                         goto done;
2011                 }
2012                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2013                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2014                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2015                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2016                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2017                 if (err) {
2018                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2019                         goto done;
2020                 }
2021         } else {
2022                 newpsl = NULL;
2023                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2024                                      msf->imsf_fmode, 0, NULL, 0);
2025         }
2026         psl = pmc->sflist;
2027         if (psl) {
2028                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2029                         psl->sl_count, psl->sl_addr, 0);
2030                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2031         } else
2032                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2033                         0, NULL, 0);
2034         pmc->sflist = newpsl;
2035         pmc->sfmode = msf->imsf_fmode;
2036         err = 0;
2037 done:
2038         rtnl_unlock();
2039         if (leavegroup)
2040                 err = ip_mc_leave_group(sk, &imr);
2041         return err;
2042 }
2043
2044 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2045         struct ip_msfilter __user *optval, int __user *optlen)
2046 {
2047         int err, len, count, copycount;
2048         struct ip_mreqn imr;
2049         __be32 addr = msf->imsf_multiaddr;
2050         struct ip_mc_socklist *pmc;
2051         struct in_device *in_dev;
2052         struct inet_sock *inet = inet_sk(sk);
2053         struct ip_sf_socklist *psl;
2054
2055         if (!MULTICAST(addr))
2056                 return -EINVAL;
2057
2058         rtnl_lock();
2059
2060         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2061         imr.imr_address.s_addr = msf->imsf_interface;
2062         imr.imr_ifindex = 0;
2063         in_dev = ip_mc_find_dev(&imr);
2064
2065         if (!in_dev) {
2066                 err = -ENODEV;
2067                 goto done;
2068         }
2069         err = -EADDRNOTAVAIL;
2070
2071         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2072                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2073                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2074                         break;
2075         }
2076         if (!pmc)               /* must have a prior join */
2077                 goto done;
2078         msf->imsf_fmode = pmc->sfmode;
2079         psl = pmc->sflist;
2080         rtnl_unlock();
2081         if (!psl) {
2082                 len = 0;
2083                 count = 0;
2084         } else {
2085                 count = psl->sl_count;
2086         }
2087         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2088         len = copycount * sizeof(psl->sl_addr[0]);
2089         msf->imsf_numsrc = count;
2090         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2091             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2092                 return -EFAULT;
2093         }
2094         if (len &&
2095             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2096                 return -EFAULT;
2097         return 0;
2098 done:
2099         rtnl_unlock();
2100         return err;
2101 }
2102
2103 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2104         struct group_filter __user *optval, int __user *optlen)
2105 {
2106         int err, i, count, copycount;
2107         struct sockaddr_in *psin;
2108         __be32 addr;
2109         struct ip_mc_socklist *pmc;
2110         struct inet_sock *inet = inet_sk(sk);
2111         struct ip_sf_socklist *psl;
2112
2113         psin = (struct sockaddr_in *)&gsf->gf_group;
2114         if (psin->sin_family != AF_INET)
2115                 return -EINVAL;
2116         addr = psin->sin_addr.s_addr;
2117         if (!MULTICAST(addr))
2118                 return -EINVAL;
2119
2120         rtnl_lock();
2121
2122         err = -EADDRNOTAVAIL;
2123
2124         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2125                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2126                     pmc->multi.imr_ifindex == gsf->gf_interface)
2127                         break;
2128         }
2129         if (!pmc)               /* must have a prior join */
2130                 goto done;
2131         gsf->gf_fmode = pmc->sfmode;
2132         psl = pmc->sflist;
2133         rtnl_unlock();
2134         count = psl ? psl->sl_count : 0;
2135         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2136         gsf->gf_numsrc = count;
2137         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2138             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2139                 return -EFAULT;
2140         }
2141         for (i=0; i<copycount; i++) {
2142                 struct sockaddr_in *psin;
2143                 struct sockaddr_storage ss;
2144
2145                 psin = (struct sockaddr_in *)&ss;
2146                 memset(&ss, 0, sizeof(ss));
2147                 psin->sin_family = AF_INET;
2148                 psin->sin_addr.s_addr = psl->sl_addr[i];
2149                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2150                         return -EFAULT;
2151         }
2152         return 0;
2153 done:
2154         rtnl_unlock();
2155         return err;
2156 }
2157
2158 /*
2159  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2160  */
2161 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2162 {
2163         struct inet_sock *inet = inet_sk(sk);
2164         struct ip_mc_socklist *pmc;
2165         struct ip_sf_socklist *psl;
2166         int i;
2167
2168         if (!MULTICAST(loc_addr))
2169                 return 1;
2170
2171         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2172                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2173                     pmc->multi.imr_ifindex == dif)
2174                         break;
2175         }
2176         if (!pmc)
2177                 return 1;
2178         psl = pmc->sflist;
2179         if (!psl)
2180                 return pmc->sfmode == MCAST_EXCLUDE;
2181
2182         for (i=0; i<psl->sl_count; i++) {
2183                 if (psl->sl_addr[i] == rmt_addr)
2184                         break;
2185         }
2186         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2187                 return 0;
2188         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2189                 return 0;
2190         return 1;
2191 }
2192
2193 /*
2194  *      A socket is closing.
2195  */
2196
2197 void ip_mc_drop_socket(struct sock *sk)
2198 {
2199         struct inet_sock *inet = inet_sk(sk);
2200         struct ip_mc_socklist *iml;
2201
2202         if (inet->mc_list == NULL)
2203                 return;
2204
2205         rtnl_lock();
2206         while ((iml = inet->mc_list) != NULL) {
2207                 struct in_device *in_dev;
2208                 inet->mc_list = iml->next;
2209
2210                 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
2211                 (void) ip_mc_leave_src(sk, iml, in_dev);
2212                 if (in_dev != NULL) {
2213                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2214                         in_dev_put(in_dev);
2215                 }
2216                 sock_kfree_s(sk, iml, sizeof(*iml));
2217         }
2218         rtnl_unlock();
2219 }
2220
2221 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2222 {
2223         struct ip_mc_list *im;
2224         struct ip_sf_list *psf;
2225         int rv = 0;
2226
2227         read_lock(&in_dev->mc_list_lock);
2228         for (im=in_dev->mc_list; im; im=im->next) {
2229                 if (im->multiaddr == mc_addr)
2230                         break;
2231         }
2232         if (im && proto == IPPROTO_IGMP) {
2233                 rv = 1;
2234         } else if (im) {
2235                 if (src_addr) {
2236                         for (psf=im->sources; psf; psf=psf->sf_next) {
2237                                 if (psf->sf_inaddr == src_addr)
2238                                         break;
2239                         }
2240                         if (psf)
2241                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2242                                         psf->sf_count[MCAST_EXCLUDE] !=
2243                                         im->sfcount[MCAST_EXCLUDE];
2244                         else
2245                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2246                 } else
2247                         rv = 1; /* unspecified source; tentatively allow */
2248         }
2249         read_unlock(&in_dev->mc_list_lock);
2250         return rv;
2251 }
2252
2253 #if defined(CONFIG_PROC_FS)
2254 struct igmp_mc_iter_state {
2255         struct net_device *dev;
2256         struct in_device *in_dev;
2257 };
2258
2259 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2260
2261 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2262 {
2263         struct ip_mc_list *im = NULL;
2264         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2265
2266         for (state->dev = dev_base, state->in_dev = NULL;
2267              state->dev;
2268              state->dev = state->dev->next) {
2269                 struct in_device *in_dev;
2270                 in_dev = in_dev_get(state->dev);
2271                 if (!in_dev)
2272                         continue;
2273                 read_lock(&in_dev->mc_list_lock);
2274                 im = in_dev->mc_list;
2275                 if (im) {
2276                         state->in_dev = in_dev;
2277                         break;
2278                 }
2279                 read_unlock(&in_dev->mc_list_lock);
2280                 in_dev_put(in_dev);
2281         }
2282         return im;
2283 }
2284
2285 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2286 {
2287         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2288         im = im->next;
2289         while (!im) {
2290                 if (likely(state->in_dev != NULL)) {
2291                         read_unlock(&state->in_dev->mc_list_lock);
2292                         in_dev_put(state->in_dev);
2293                 }
2294                 state->dev = state->dev->next;
2295                 if (!state->dev) {
2296                         state->in_dev = NULL;
2297                         break;
2298                 }
2299                 state->in_dev = in_dev_get(state->dev);
2300                 if (!state->in_dev)
2301                         continue;
2302                 read_lock(&state->in_dev->mc_list_lock);
2303                 im = state->in_dev->mc_list;
2304         }
2305         return im;
2306 }
2307
2308 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2309 {
2310         struct ip_mc_list *im = igmp_mc_get_first(seq);
2311         if (im)
2312                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2313                         --pos;
2314         return pos ? NULL : im;
2315 }
2316
2317 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2318 {
2319         read_lock(&dev_base_lock);
2320         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2321 }
2322
2323 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2324 {
2325         struct ip_mc_list *im;
2326         if (v == SEQ_START_TOKEN)
2327                 im = igmp_mc_get_first(seq);
2328         else
2329                 im = igmp_mc_get_next(seq, v);
2330         ++*pos;
2331         return im;
2332 }
2333
2334 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2335 {
2336         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2337         if (likely(state->in_dev != NULL)) {
2338                 read_unlock(&state->in_dev->mc_list_lock);
2339                 in_dev_put(state->in_dev);
2340                 state->in_dev = NULL;
2341         }
2342         state->dev = NULL;
2343         read_unlock(&dev_base_lock);
2344 }
2345
2346 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2347 {
2348         if (v == SEQ_START_TOKEN)
2349                 seq_puts(seq,
2350                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2351         else {
2352                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2353                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2354                 char   *querier;
2355 #ifdef CONFIG_IP_MULTICAST
2356                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2357                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2358                           "V3";
2359 #else
2360                 querier = "NONE";
2361 #endif
2362
2363                 if (state->in_dev->mc_list == im) {
2364                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2365                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2366                 }
2367
2368                 seq_printf(seq,
2369                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2370                            im->multiaddr, im->users,
2371                            im->tm_running, im->tm_running ?
2372                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2373                            im->reporter);
2374         }
2375         return 0;
2376 }
2377
2378 static struct seq_operations igmp_mc_seq_ops = {
2379         .start  =       igmp_mc_seq_start,
2380         .next   =       igmp_mc_seq_next,
2381         .stop   =       igmp_mc_seq_stop,
2382         .show   =       igmp_mc_seq_show,
2383 };
2384
2385 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2386 {
2387         struct seq_file *seq;
2388         int rc = -ENOMEM;
2389         struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2390
2391         if (!s)
2392                 goto out;
2393         rc = seq_open(file, &igmp_mc_seq_ops);
2394         if (rc)
2395                 goto out_kfree;
2396
2397         seq = file->private_data;
2398         seq->private = s;
2399 out:
2400         return rc;
2401 out_kfree:
2402         kfree(s);
2403         goto out;
2404 }
2405
2406 static const struct file_operations igmp_mc_seq_fops = {
2407         .owner          =       THIS_MODULE,
2408         .open           =       igmp_mc_seq_open,
2409         .read           =       seq_read,
2410         .llseek         =       seq_lseek,
2411         .release        =       seq_release_private,
2412 };
2413
2414 struct igmp_mcf_iter_state {
2415         struct net_device *dev;
2416         struct in_device *idev;
2417         struct ip_mc_list *im;
2418 };
2419
2420 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2421
2422 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2423 {
2424         struct ip_sf_list *psf = NULL;
2425         struct ip_mc_list *im = NULL;
2426         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2427
2428         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2429              state->dev;
2430              state->dev = state->dev->next) {
2431                 struct in_device *idev;
2432                 idev = in_dev_get(state->dev);
2433                 if (unlikely(idev == NULL))
2434                         continue;
2435                 read_lock(&idev->mc_list_lock);
2436                 im = idev->mc_list;
2437                 if (likely(im != NULL)) {
2438                         spin_lock_bh(&im->lock);
2439                         psf = im->sources;
2440                         if (likely(psf != NULL)) {
2441                                 state->im = im;
2442                                 state->idev = idev;
2443                                 break;
2444                         }
2445                         spin_unlock_bh(&im->lock);
2446                 }
2447                 read_unlock(&idev->mc_list_lock);
2448                 in_dev_put(idev);
2449         }
2450         return psf;
2451 }
2452
2453 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2454 {
2455         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2456
2457         psf = psf->sf_next;
2458         while (!psf) {
2459                 spin_unlock_bh(&state->im->lock);
2460                 state->im = state->im->next;
2461                 while (!state->im) {
2462                         if (likely(state->idev != NULL)) {
2463                                 read_unlock(&state->idev->mc_list_lock);
2464                                 in_dev_put(state->idev);
2465                         }
2466                         state->dev = state->dev->next;
2467                         if (!state->dev) {
2468                                 state->idev = NULL;
2469                                 goto out;
2470                         }
2471                         state->idev = in_dev_get(state->dev);
2472                         if (!state->idev)
2473                                 continue;
2474                         read_lock(&state->idev->mc_list_lock);
2475                         state->im = state->idev->mc_list;
2476                 }
2477                 if (!state->im)
2478                         break;
2479                 spin_lock_bh(&state->im->lock);
2480                 psf = state->im->sources;
2481         }
2482 out:
2483         return psf;
2484 }
2485
2486 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2487 {
2488         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2489         if (psf)
2490                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2491                         --pos;
2492         return pos ? NULL : psf;
2493 }
2494
2495 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2496 {
2497         read_lock(&dev_base_lock);
2498         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2499 }
2500
2501 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2502 {
2503         struct ip_sf_list *psf;
2504         if (v == SEQ_START_TOKEN)
2505                 psf = igmp_mcf_get_first(seq);
2506         else
2507                 psf = igmp_mcf_get_next(seq, v);
2508         ++*pos;
2509         return psf;
2510 }
2511
2512 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2513 {
2514         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2515         if (likely(state->im != NULL)) {
2516                 spin_unlock_bh(&state->im->lock);
2517                 state->im = NULL;
2518         }
2519         if (likely(state->idev != NULL)) {
2520                 read_unlock(&state->idev->mc_list_lock);
2521                 in_dev_put(state->idev);
2522                 state->idev = NULL;
2523         }
2524         state->dev = NULL;
2525         read_unlock(&dev_base_lock);
2526 }
2527
2528 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2529 {
2530         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2531         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2532
2533         if (v == SEQ_START_TOKEN) {
2534                 seq_printf(seq,
2535                            "%3s %6s "
2536                            "%10s %10s %6s %6s\n", "Idx",
2537                            "Device", "MCA",
2538                            "SRC", "INC", "EXC");
2539         } else {
2540                 seq_printf(seq,
2541                            "%3d %6.6s 0x%08x "
2542                            "0x%08x %6lu %6lu\n",
2543                            state->dev->ifindex, state->dev->name,
2544                            ntohl(state->im->multiaddr),
2545                            ntohl(psf->sf_inaddr),
2546                            psf->sf_count[MCAST_INCLUDE],
2547                            psf->sf_count[MCAST_EXCLUDE]);
2548         }
2549         return 0;
2550 }
2551
2552 static struct seq_operations igmp_mcf_seq_ops = {
2553         .start  =       igmp_mcf_seq_start,
2554         .next   =       igmp_mcf_seq_next,
2555         .stop   =       igmp_mcf_seq_stop,
2556         .show   =       igmp_mcf_seq_show,
2557 };
2558
2559 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2560 {
2561         struct seq_file *seq;
2562         int rc = -ENOMEM;
2563         struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2564
2565         if (!s)
2566                 goto out;
2567         rc = seq_open(file, &igmp_mcf_seq_ops);
2568         if (rc)
2569                 goto out_kfree;
2570
2571         seq = file->private_data;
2572         seq->private = s;
2573 out:
2574         return rc;
2575 out_kfree:
2576         kfree(s);
2577         goto out;
2578 }
2579
2580 static const struct file_operations igmp_mcf_seq_fops = {
2581         .owner          =       THIS_MODULE,
2582         .open           =       igmp_mcf_seq_open,
2583         .read           =       seq_read,
2584         .llseek         =       seq_lseek,
2585         .release        =       seq_release_private,
2586 };
2587
2588 int __init igmp_mc_proc_init(void)
2589 {
2590         proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2591         proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2592         return 0;
2593 }
2594 #endif
2595
2596 EXPORT_SYMBOL(ip_mc_dec_group);
2597 EXPORT_SYMBOL(ip_mc_inc_group);
2598 EXPORT_SYMBOL(ip_mc_join_group);