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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, __u32 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, __u32 *pmca, int sfmode,
 148                          int sfcount, __u32 *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                 u32 *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(u32) +
 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                 psrc = (u32 *)skb_put(skb, sizeof(u32));
 459                 *psrc = psf->sf_inaddr;
 460                 scount++; stotal++;
 461                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 462                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 463                         psf->sf_crcount--;
 464                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 465                                 if (psf_prev)
 466                                         psf_prev->sf_next = psf->sf_next;
 467                                 else
 468                                         *psf_list = psf->sf_next;
 469                                 kfree(psf);
 470                                 continue;
 471                         }
 472                 }
 473                 psf_prev = psf;
 474         }
 475
 476 empty_source:
 477         if (!stotal) {
 478                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 479                     type == IGMPV3_BLOCK_OLD_SOURCES)
 480                         return skb;
 481                 if (pmc->crcount || isquery) {
 482                         /* make sure we have room for group header */
 483                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 484                                 igmpv3_sendpack(skb);
 485                                 skb = NULL; /* add_grhead will get a new one */
 486                         }
 487                         skb = add_grhead(skb, pmc, type, &pgr);
 488                 }
 489         }
 490         if (pgr)
 491                 pgr->grec_nsrcs = htons(scount);
 492
 493         if (isquery)
 494                 pmc->gsquery = 0;       /* clear query state on report */
 495         return skb;
 496 }
 497
 498 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 499 {
 500         struct sk_buff *skb = NULL;
 501         int type;
 502
 503         if (!pmc) {
 504                 read_lock(&in_dev->mc_list_lock);
 505                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 506                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 507                                 continue;
 508                         spin_lock_bh(&pmc->lock);
 509                         if (pmc->sfcount[MCAST_EXCLUDE])
 510                                 type = IGMPV3_MODE_IS_EXCLUDE;
 511                         else
 512                                 type = IGMPV3_MODE_IS_INCLUDE;
 513                         skb = add_grec(skb, pmc, type, 0, 0);
 514                         spin_unlock_bh(&pmc->lock);
 515                 }
 516                 read_unlock(&in_dev->mc_list_lock);
 517         } else {
 518                 spin_lock_bh(&pmc->lock);
 519                 if (pmc->sfcount[MCAST_EXCLUDE])
 520                         type = IGMPV3_MODE_IS_EXCLUDE;
 521                 else
 522                         type = IGMPV3_MODE_IS_INCLUDE;
 523                 skb = add_grec(skb, pmc, type, 0, 0);
 524                 spin_unlock_bh(&pmc->lock);
 525         }
 526         if (!skb)
 527                 return 0;
 528         return igmpv3_sendpack(skb);
 529 }
 530
 531 /*
 532  * remove zero-count source records from a source filter list
 533  */
 534 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 535 {
 536         struct ip_sf_list *psf_prev, *psf_next, *psf;
 537
 538         psf_prev = NULL;
 539         for (psf=*ppsf; psf; psf = psf_next) {
 540                 psf_next = psf->sf_next;
 541                 if (psf->sf_crcount == 0) {
 542                         if (psf_prev)
 543                                 psf_prev->sf_next = psf->sf_next;
 544                         else
 545                                 *ppsf = psf->sf_next;
 546                         kfree(psf);
 547                 } else
 548                         psf_prev = psf;
 549         }
 550 }
 551
 552 static void igmpv3_send_cr(struct in_device *in_dev)
 553 {
 554         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 555         struct sk_buff *skb = NULL;
 556         int type, dtype;
 557
 558         read_lock(&in_dev->mc_list_lock);
 559         spin_lock_bh(&in_dev->mc_tomb_lock);
 560
 561         /* deleted MCA's */
 562         pmc_prev = NULL;
 563         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 564                 pmc_next = pmc->next;
 565                 if (pmc->sfmode == MCAST_INCLUDE) {
 566                         type = IGMPV3_BLOCK_OLD_SOURCES;
 567                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 568                         skb = add_grec(skb, pmc, type, 1, 0);
 569                         skb = add_grec(skb, pmc, dtype, 1, 1);
 570                 }
 571                 if (pmc->crcount) {
 572                         if (pmc->sfmode == MCAST_EXCLUDE) {
 573                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 574                                 skb = add_grec(skb, pmc, type, 1, 0);
 575                         }
 576                         pmc->crcount--;
 577                         if (pmc->crcount == 0) {
 578                                 igmpv3_clear_zeros(&pmc->tomb);
 579                                 igmpv3_clear_zeros(&pmc->sources);
 580                         }
 581                 }
 582                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 583                         if (pmc_prev)
 584                                 pmc_prev->next = pmc_next;
 585                         else
 586                                 in_dev->mc_tomb = pmc_next;
 587                         in_dev_put(pmc->interface);
 588                         kfree(pmc);
 589                 } else
 590                         pmc_prev = pmc;
 591         }
 592         spin_unlock_bh(&in_dev->mc_tomb_lock);
 593
 594         /* change recs */
 595         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 596                 spin_lock_bh(&pmc->lock);
 597                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 598                         type = IGMPV3_BLOCK_OLD_SOURCES;
 599                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 600                 } else {
 601                         type = IGMPV3_ALLOW_NEW_SOURCES;
 602                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 603                 }
 604                 skb = add_grec(skb, pmc, type, 0, 0);
 605                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 606
 607                 /* filter mode changes */
 608                 if (pmc->crcount) {
 609                         if (pmc->sfmode == MCAST_EXCLUDE)
 610                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 611                         else
 612                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 613                         skb = add_grec(skb, pmc, type, 0, 0);
 614                         pmc->crcount--;
 615                 }
 616                 spin_unlock_bh(&pmc->lock);
 617         }
 618         read_unlock(&in_dev->mc_list_lock);
 619
 620         if (!skb)
 621                 return;
 622         (void) igmpv3_sendpack(skb);
 623 }
 624
 625 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 626         int type)
 627 {
 628         struct sk_buff *skb;
 629         struct iphdr *iph;
 630         struct igmphdr *ih;
 631         struct rtable *rt;
 632         struct net_device *dev = in_dev->dev;
 633         u32     group = pmc ? pmc->multiaddr : 0;
 634         u32     dst;
 635
 636         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 637                 return igmpv3_send_report(in_dev, pmc);
 638         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 639                 dst = IGMP_ALL_ROUTER;
 640         else
 641                 dst = group;
 642
 643         {
 644                 struct flowi fl = { .oif = dev->ifindex,
 645                                     .nl_u = { .ip4_u = { .daddr = dst } },
 646                                     .proto = IPPROTO_IGMP };
 647                 if (ip_route_output_key(&rt, &fl))
 648                         return -1;
 649         }
 650         if (rt->rt_src == 0) {
 651                 ip_rt_put(rt);
 652                 return -1;
 653         }
 654
 655         skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 656         if (skb == NULL) {
 657                 ip_rt_put(rt);
 658                 return -1;
 659         }
 660
 661         skb->dst = &rt->u.dst;
 662
 663         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 664
 665         skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
 666
 667         iph->version  = 4;
 668         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 669         iph->tos      = 0xc0;
 670         iph->frag_off = htons(IP_DF);
 671         iph->ttl      = 1;
 672         iph->daddr    = dst;
 673         iph->saddr    = rt->rt_src;
 674         iph->protocol = IPPROTO_IGMP;
 675         iph->tot_len  = htons(IGMP_SIZE);
 676         ip_select_ident(iph, &rt->u.dst, NULL);
 677         ((u8*)&iph[1])[0] = IPOPT_RA;
 678         ((u8*)&iph[1])[1] = 4;
 679         ((u8*)&iph[1])[2] = 0;
 680         ((u8*)&iph[1])[3] = 0;
 681         ip_send_check(iph);
 682
 683         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 684         ih->type=type;
 685         ih->code=0;
 686         ih->csum=0;
 687         ih->group=group;
 688         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 689
 690         return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
 691                        dst_output);
 692 }
 693
 694 static void igmp_gq_timer_expire(unsigned long data)
 695 {
 696         struct in_device *in_dev = (struct in_device *)data;
 697
 698         in_dev->mr_gq_running = 0;
 699         igmpv3_send_report(in_dev, NULL);
 700         __in_dev_put(in_dev);
 701 }
 702
 703 static void igmp_ifc_timer_expire(unsigned long data)
 704 {
 705         struct in_device *in_dev = (struct in_device *)data;
 706
 707         igmpv3_send_cr(in_dev);
 708         if (in_dev->mr_ifc_count) {
 709                 in_dev->mr_ifc_count--;
 710                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 711         }
 712         __in_dev_put(in_dev);
 713 }
 714
 715 static void igmp_ifc_event(struct in_device *in_dev)
 716 {
 717         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 718                 return;
 719         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 720                 IGMP_Unsolicited_Report_Count;
 721         igmp_ifc_start_timer(in_dev, 1);
 722 }
 723
 724
 725 static void igmp_timer_expire(unsigned long data)
 726 {
 727         struct ip_mc_list *im=(struct ip_mc_list *)data;
 728         struct in_device *in_dev = im->interface;
 729
 730         spin_lock(&im->lock);
 731         im->tm_running=0;
 732
 733         if (im->unsolicit_count) {
 734                 im->unsolicit_count--;
 735                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 736         }
 737         im->reporter = 1;
 738         spin_unlock(&im->lock);
 739
 740         if (IGMP_V1_SEEN(in_dev))
 741                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 742         else if (IGMP_V2_SEEN(in_dev))
 743                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 744         else
 745                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 746
 747         ip_ma_put(im);
 748 }
 749
 750 /* mark EXCLUDE-mode sources */
 751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs)
 752 {
 753         struct ip_sf_list *psf;
 754         int i, scount;
 755
 756         scount = 0;
 757         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 758                 if (scount == nsrcs)
 759                         break;
 760                 for (i=0; i<nsrcs; i++) {
 761                         /* skip inactive filters */
 762                         if (pmc->sfcount[MCAST_INCLUDE] ||
 763                             pmc->sfcount[MCAST_EXCLUDE] !=
 764                             psf->sf_count[MCAST_EXCLUDE])
 765                                 continue;
 766                         if (srcs[i] == psf->sf_inaddr) {
 767                                 scount++;
 768                                 break;
 769                         }
 770                 }
 771         }
 772         pmc->gsquery = 0;
 773         if (scount == nsrcs)    /* all sources excluded */
 774                 return 0;
 775         return 1;
 776 }
 777
 778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs)
 779 {
 780         struct ip_sf_list *psf;
 781         int i, scount;
 782
 783         if (pmc->sfmode == MCAST_EXCLUDE)
 784                 return igmp_xmarksources(pmc, nsrcs, srcs);
 785
 786         /* mark INCLUDE-mode sources */
 787         scount = 0;
 788         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 789                 if (scount == nsrcs)
 790                         break;
 791                 for (i=0; i<nsrcs; i++)
 792                         if (srcs[i] == psf->sf_inaddr) {
 793                                 psf->sf_gsresp = 1;
 794                                 scount++;
 795                                 break;
 796                         }
 797         }
 798         if (!scount) {
 799                 pmc->gsquery = 0;
 800                 return 0;
 801         }
 802         pmc->gsquery = 1;
 803         return 1;
 804 }
 805
 806 static void igmp_heard_report(struct in_device *in_dev, u32 group)
 807 {
 808         struct ip_mc_list *im;
 809
 810         /* Timers are only set for non-local groups */
 811
 812         if (group == IGMP_ALL_HOSTS)
 813                 return;
 814
 815         read_lock(&in_dev->mc_list_lock);
 816         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 817                 if (im->multiaddr == group) {
 818                         igmp_stop_timer(im);
 819                         break;
 820                 }
 821         }
 822         read_unlock(&in_dev->mc_list_lock);
 823 }
 824
 825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 826         int len)
 827 {
 828         struct igmphdr          *ih = skb->h.igmph;
 829         struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
 830         struct ip_mc_list       *im;
 831         u32                     group = ih->group;
 832         int                     max_delay;
 833         int                     mark = 0;
 834
 835
 836         if (len == 8) {
 837                 if (ih->code == 0) {
 838                         /* Alas, old v1 router presents here. */
 839
 840                         max_delay = IGMP_Query_Response_Interval;
 841                         in_dev->mr_v1_seen = jiffies +
 842                                 IGMP_V1_Router_Present_Timeout;
 843                         group = 0;
 844                 } else {
 845                         /* v2 router present */
 846                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 847                         in_dev->mr_v2_seen = jiffies +
 848                                 IGMP_V2_Router_Present_Timeout;
 849                 }
 850                 /* cancel the interface change timer */
 851                 in_dev->mr_ifc_count = 0;
 852                 if (del_timer(&in_dev->mr_ifc_timer))
 853                         __in_dev_put(in_dev);
 854                 /* clear deleted report items */
 855                 igmpv3_clear_delrec(in_dev);
 856         } else if (len < 12) {
 857                 return; /* ignore bogus packet; freed by caller */
 858         } else { /* v3 */
 859                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 860                         return;
 861
 862                 ih3 = (struct igmpv3_query *) skb->h.raw;
 863                 if (ih3->nsrcs) {
 864                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 865                                            + ntohs(ih3->nsrcs)*sizeof(__u32)))
 866                                 return;
 867                         ih3 = (struct igmpv3_query *) skb->h.raw;
 868                 }
 869
 870                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 871                 if (!max_delay)
 872                         max_delay = 1;  /* can't mod w/ 0 */
 873                 in_dev->mr_maxdelay = max_delay;
 874                 if (ih3->qrv)
 875                         in_dev->mr_qrv = ih3->qrv;
 876                 if (!group) { /* general query */
 877                         if (ih3->nsrcs)
 878                                 return; /* no sources allowed */
 879                         igmp_gq_start_timer(in_dev);
 880                         return;
 881                 }
 882                 /* mark sources to include, if group & source-specific */
 883                 mark = ih3->nsrcs != 0;
 884         }
 885
 886         /*
 887          * - Start the timers in all of our membership records
 888          *   that the query applies to for the interface on
 889          *   which the query arrived excl. those that belong
 890          *   to a "local" group (224.0.0.X)
 891          * - For timers already running check if they need to
 892          *   be reset.
 893          * - Use the igmp->igmp_code field as the maximum
 894          *   delay possible
 895          */
 896         read_lock(&in_dev->mc_list_lock);
 897         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 898                 int changed;
 899
 900                 if (group && group != im->multiaddr)
 901                         continue;
 902                 if (im->multiaddr == IGMP_ALL_HOSTS)
 903                         continue;
 904                 spin_lock_bh(&im->lock);
 905                 if (im->tm_running)
 906                         im->gsquery = im->gsquery && mark;
 907                 else
 908                         im->gsquery = mark;
 909                 changed = !im->gsquery ||
 910                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 911                 spin_unlock_bh(&im->lock);
 912                 if (changed)
 913                         igmp_mod_timer(im, max_delay);
 914         }
 915         read_unlock(&in_dev->mc_list_lock);
 916 }
 917
 918 int igmp_rcv(struct sk_buff *skb)
 919 {
 920         /* This basically follows the spec line by line -- see RFC1112 */
 921         struct igmphdr *ih;
 922         struct in_device *in_dev = in_dev_get(skb->dev);
 923         int len = skb->len;
 924
 925         if (in_dev==NULL) {
 926                 kfree_skb(skb);
 927                 return 0;
 928         }
 929
 930         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 931                 goto drop;
 932
 933         switch (skb->ip_summed) {
 934         case CHECKSUM_COMPLETE:
 935                 if (!(u16)csum_fold(skb->csum))
 936                         break;
 937                 /* fall through */
 938         case CHECKSUM_NONE:
 939                 skb->csum = 0;
 940                 if (__skb_checksum_complete(skb))
 941                         goto drop;
 942         }
 943
 944         ih = skb->h.igmph;
 945         switch (ih->type) {
 946         case IGMP_HOST_MEMBERSHIP_QUERY:
 947                 igmp_heard_query(in_dev, skb, len);
 948                 break;
 949         case IGMP_HOST_MEMBERSHIP_REPORT:
 950         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 951         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 952                 /* Is it our report looped back? */
 953                 if (((struct rtable*)skb->dst)->fl.iif == 0)
 954                         break;
 955                 /* don't rely on MC router hearing unicast reports */
 956                 if (skb->pkt_type == PACKET_MULTICAST ||
 957                     skb->pkt_type == PACKET_BROADCAST)
 958                         igmp_heard_report(in_dev, ih->group);
 959                 break;
 960         case IGMP_PIM:
 961 #ifdef CONFIG_IP_PIMSM_V1
 962                 in_dev_put(in_dev);
 963                 return pim_rcv_v1(skb);
 964 #endif
 965         case IGMP_DVMRP:
 966         case IGMP_TRACE:
 967         case IGMP_HOST_LEAVE_MESSAGE:
 968         case IGMP_MTRACE:
 969         case IGMP_MTRACE_RESP:
 970                 break;
 971         default:
 972                 break;
 973         }
 974
 975 drop:
 976         in_dev_put(in_dev);
 977         kfree_skb(skb);
 978         return 0;
 979 }
 980
 981 #endif
 982
 983
 984 /*
 985  *      Add a filter to a device
 986  */
 987
 988 static void ip_mc_filter_add(struct in_device *in_dev, u32 addr)
 989 {
 990         char buf[MAX_ADDR_LEN];
 991         struct net_device *dev = in_dev->dev;
 992
 993         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 994            We will get multicast token leakage, when IFF_MULTICAST
 995            is changed. This check should be done in dev->set_multicast_list
 996            routine. Something sort of:
 997            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 998            --ANK
 999            */
1000         if (arp_mc_map(addr, buf, dev, 0) == 0)
1001                 dev_mc_add(dev,buf,dev->addr_len,0);
1002 }
1003
1004 /*
1005  *      Remove a filter from a device
1006  */
1007
1008 static void ip_mc_filter_del(struct in_device *in_dev, u32 addr)
1009 {
1010         char buf[MAX_ADDR_LEN];
1011         struct net_device *dev = in_dev->dev;
1012
1013         if (arp_mc_map(addr, buf, dev, 0) == 0)
1014                 dev_mc_delete(dev,buf,dev->addr_len,0);
1015 }
1016
1017 #ifdef CONFIG_IP_MULTICAST
1018 /*
1019  * deleted ip_mc_list manipulation
1020  */
1021 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1022 {
1023         struct ip_mc_list *pmc;
1024
1025         /* this is an "ip_mc_list" for convenience; only the fields below
1026          * are actually used. In particular, the refcnt and users are not
1027          * used for management of the delete list. Using the same structure
1028          * for deleted items allows change reports to use common code with
1029          * non-deleted or query-response MCA's.
1030          */
1031         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1032         if (!pmc)
1033                 return;
1034         spin_lock_bh(&im->lock);
1035         pmc->interface = im->interface;
1036         in_dev_hold(in_dev);
1037         pmc->multiaddr = im->multiaddr;
1038         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1039                 IGMP_Unsolicited_Report_Count;
1040         pmc->sfmode = im->sfmode;
1041         if (pmc->sfmode == MCAST_INCLUDE) {
1042                 struct ip_sf_list *psf;
1043
1044                 pmc->tomb = im->tomb;
1045                 pmc->sources = im->sources;
1046                 im->tomb = im->sources = NULL;
1047                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1048                         psf->sf_crcount = pmc->crcount;
1049         }
1050         spin_unlock_bh(&im->lock);
1051
1052         spin_lock_bh(&in_dev->mc_tomb_lock);
1053         pmc->next = in_dev->mc_tomb;
1054         in_dev->mc_tomb = pmc;
1055         spin_unlock_bh(&in_dev->mc_tomb_lock);
1056 }
1057
1058 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr)
1059 {
1060         struct ip_mc_list *pmc, *pmc_prev;
1061         struct ip_sf_list *psf, *psf_next;
1062
1063         spin_lock_bh(&in_dev->mc_tomb_lock);
1064         pmc_prev = NULL;
1065         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1066                 if (pmc->multiaddr == multiaddr)
1067                         break;
1068                 pmc_prev = pmc;
1069         }
1070         if (pmc) {
1071                 if (pmc_prev)
1072                         pmc_prev->next = pmc->next;
1073                 else
1074                         in_dev->mc_tomb = pmc->next;
1075         }
1076         spin_unlock_bh(&in_dev->mc_tomb_lock);
1077         if (pmc) {
1078                 for (psf=pmc->tomb; psf; psf=psf_next) {
1079                         psf_next = psf->sf_next;
1080                         kfree(psf);
1081                 }
1082                 in_dev_put(pmc->interface);
1083                 kfree(pmc);
1084         }
1085 }
1086
1087 static void igmpv3_clear_delrec(struct in_device *in_dev)
1088 {
1089         struct ip_mc_list *pmc, *nextpmc;
1090
1091         spin_lock_bh(&in_dev->mc_tomb_lock);
1092         pmc = in_dev->mc_tomb;
1093         in_dev->mc_tomb = NULL;
1094         spin_unlock_bh(&in_dev->mc_tomb_lock);
1095
1096         for (; pmc; pmc = nextpmc) {
1097                 nextpmc = pmc->next;
1098                 ip_mc_clear_src(pmc);
1099                 in_dev_put(pmc->interface);
1100                 kfree(pmc);
1101         }
1102         /* clear dead sources, too */
1103         read_lock(&in_dev->mc_list_lock);
1104         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1105                 struct ip_sf_list *psf, *psf_next;
1106
1107                 spin_lock_bh(&pmc->lock);
1108                 psf = pmc->tomb;
1109                 pmc->tomb = NULL;
1110                 spin_unlock_bh(&pmc->lock);
1111                 for (; psf; psf=psf_next) {
1112                         psf_next = psf->sf_next;
1113                         kfree(psf);
1114                 }
1115         }
1116         read_unlock(&in_dev->mc_list_lock);
1117 }
1118 #endif
1119
1120 static void igmp_group_dropped(struct ip_mc_list *im)
1121 {
1122         struct in_device *in_dev = im->interface;
1123 #ifdef CONFIG_IP_MULTICAST
1124         int reporter;
1125 #endif
1126
1127         if (im->loaded) {
1128                 im->loaded = 0;
1129                 ip_mc_filter_del(in_dev, im->multiaddr);
1130         }
1131
1132 #ifdef CONFIG_IP_MULTICAST
1133         if (im->multiaddr == IGMP_ALL_HOSTS)
1134                 return;
1135
1136         reporter = im->reporter;
1137         igmp_stop_timer(im);
1138
1139         if (!in_dev->dead) {
1140                 if (IGMP_V1_SEEN(in_dev))
1141                         goto done;
1142                 if (IGMP_V2_SEEN(in_dev)) {
1143                         if (reporter)
1144                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1145                         goto done;
1146                 }
1147                 /* IGMPv3 */
1148                 igmpv3_add_delrec(in_dev, im);
1149
1150                 igmp_ifc_event(in_dev);
1151         }
1152 done:
1153 #endif
1154         ip_mc_clear_src(im);
1155 }
1156
1157 static void igmp_group_added(struct ip_mc_list *im)
1158 {
1159         struct in_device *in_dev = im->interface;
1160
1161         if (im->loaded == 0) {
1162                 im->loaded = 1;
1163                 ip_mc_filter_add(in_dev, im->multiaddr);
1164         }
1165
1166 #ifdef CONFIG_IP_MULTICAST
1167         if (im->multiaddr == IGMP_ALL_HOSTS)
1168                 return;
1169
1170         if (in_dev->dead)
1171                 return;
1172         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1173                 spin_lock_bh(&im->lock);
1174                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1175                 spin_unlock_bh(&im->lock);
1176                 return;
1177         }
1178         /* else, v3 */
1179
1180         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1181                 IGMP_Unsolicited_Report_Count;
1182         igmp_ifc_event(in_dev);
1183 #endif
1184 }
1185
1186
1187 /*
1188  *      Multicast list managers
1189  */
1190
1191
1192 /*
1193  *      A socket has joined a multicast group on device dev.
1194  */
1195
1196 void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
1197 {
1198         struct ip_mc_list *im;
1199
1200         ASSERT_RTNL();
1201
1202         for (im=in_dev->mc_list; im; im=im->next) {
1203                 if (im->multiaddr == addr) {
1204                         im->users++;
1205                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1206                         goto out;
1207                 }
1208         }
1209
1210         im = kmalloc(sizeof(*im), GFP_KERNEL);
1211         if (!im)
1212                 goto out;
1213
1214         im->users=1;
1215         im->interface=in_dev;
1216         in_dev_hold(in_dev);
1217         im->multiaddr=addr;
1218         /* initial mode is (EX, empty) */
1219         im->sfmode = MCAST_EXCLUDE;
1220         im->sfcount[MCAST_INCLUDE] = 0;
1221         im->sfcount[MCAST_EXCLUDE] = 1;
1222         im->sources = NULL;
1223         im->tomb = NULL;
1224         im->crcount = 0;
1225         atomic_set(&im->refcnt, 1);
1226         spin_lock_init(&im->lock);
1227 #ifdef CONFIG_IP_MULTICAST
1228         im->tm_running=0;
1229         init_timer(&im->timer);
1230         im->timer.data=(unsigned long)im;
1231         im->timer.function=&igmp_timer_expire;
1232         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1233         im->reporter = 0;
1234         im->gsquery = 0;
1235 #endif
1236         im->loaded = 0;
1237         write_lock_bh(&in_dev->mc_list_lock);
1238         im->next=in_dev->mc_list;
1239         in_dev->mc_list=im;
1240         write_unlock_bh(&in_dev->mc_list_lock);
1241 #ifdef CONFIG_IP_MULTICAST
1242         igmpv3_del_delrec(in_dev, im->multiaddr);
1243 #endif
1244         igmp_group_added(im);
1245         if (!in_dev->dead)
1246                 ip_rt_multicast_event(in_dev);
1247 out:
1248         return;
1249 }
1250
1251 /*
1252  *      A socket has left a multicast group on device dev
1253  */
1254
1255 void ip_mc_dec_group(struct in_device *in_dev, u32 addr)
1256 {
1257         struct ip_mc_list *i, **ip;
1258
1259         ASSERT_RTNL();
1260
1261         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1262                 if (i->multiaddr==addr) {
1263                         if (--i->users == 0) {
1264                                 write_lock_bh(&in_dev->mc_list_lock);
1265                                 *ip = i->next;
1266                                 write_unlock_bh(&in_dev->mc_list_lock);
1267                                 igmp_group_dropped(i);
1268
1269                                 if (!in_dev->dead)
1270                                         ip_rt_multicast_event(in_dev);
1271
1272                                 ip_ma_put(i);
1273                                 return;
1274                         }
1275                         break;
1276                 }
1277         }
1278 }
1279
1280 /* Device going down */
1281
1282 void ip_mc_down(struct in_device *in_dev)
1283 {
1284         struct ip_mc_list *i;
1285
1286         ASSERT_RTNL();
1287
1288         for (i=in_dev->mc_list; i; i=i->next)
1289                 igmp_group_dropped(i);
1290
1291 #ifdef CONFIG_IP_MULTICAST
1292         in_dev->mr_ifc_count = 0;
1293         if (del_timer(&in_dev->mr_ifc_timer))
1294                 __in_dev_put(in_dev);
1295         in_dev->mr_gq_running = 0;
1296         if (del_timer(&in_dev->mr_gq_timer))
1297                 __in_dev_put(in_dev);
1298         igmpv3_clear_delrec(in_dev);
1299 #endif
1300
1301         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1302 }
1303
1304 void ip_mc_init_dev(struct in_device *in_dev)
1305 {
1306         ASSERT_RTNL();
1307
1308         in_dev->mc_tomb = NULL;
1309 #ifdef CONFIG_IP_MULTICAST
1310         in_dev->mr_gq_running = 0;
1311         init_timer(&in_dev->mr_gq_timer);
1312         in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1313         in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1314         in_dev->mr_ifc_count = 0;
1315         init_timer(&in_dev->mr_ifc_timer);
1316         in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1317         in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1318         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1319 #endif
1320
1321         rwlock_init(&in_dev->mc_list_lock);
1322         spin_lock_init(&in_dev->mc_tomb_lock);
1323 }
1324
1325 /* Device going up */
1326
1327 void ip_mc_up(struct in_device *in_dev)
1328 {
1329         struct ip_mc_list *i;
1330
1331         ASSERT_RTNL();
1332
1333         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1334
1335         for (i=in_dev->mc_list; i; i=i->next)
1336                 igmp_group_added(i);
1337 }
1338
1339 /*
1340  *      Device is about to be destroyed: clean up.
1341  */
1342
1343 void ip_mc_destroy_dev(struct in_device *in_dev)
1344 {
1345         struct ip_mc_list *i;
1346
1347         ASSERT_RTNL();
1348
1349         /* Deactivate timers */
1350         ip_mc_down(in_dev);
1351
1352         write_lock_bh(&in_dev->mc_list_lock);
1353         while ((i = in_dev->mc_list) != NULL) {
1354                 in_dev->mc_list = i->next;
1355                 write_unlock_bh(&in_dev->mc_list_lock);
1356
1357                 igmp_group_dropped(i);
1358                 ip_ma_put(i);
1359
1360                 write_lock_bh(&in_dev->mc_list_lock);
1361         }
1362         write_unlock_bh(&in_dev->mc_list_lock);
1363 }
1364
1365 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1366 {
1367         struct flowi fl = { .nl_u = { .ip4_u =
1368                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1369         struct rtable *rt;
1370         struct net_device *dev = NULL;
1371         struct in_device *idev = NULL;
1372
1373         if (imr->imr_ifindex) {
1374                 idev = inetdev_by_index(imr->imr_ifindex);
1375                 if (idev)
1376                         __in_dev_put(idev);
1377                 return idev;
1378         }
1379         if (imr->imr_address.s_addr) {
1380                 dev = ip_dev_find(imr->imr_address.s_addr);
1381                 if (!dev)
1382                         return NULL;
1383                 dev_put(dev);
1384         }
1385
1386         if (!dev && !ip_route_output_key(&rt, &fl)) {
1387                 dev = rt->u.dst.dev;
1388                 ip_rt_put(rt);
1389         }
1390         if (dev) {
1391                 imr->imr_ifindex = dev->ifindex;
1392                 idev = __in_dev_get_rtnl(dev);
1393         }
1394         return idev;
1395 }
1396
1397 /*
1398  *      Join a socket to a group
1399  */
1400 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1401 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1402
1403
1404 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1405         __u32 *psfsrc)
1406 {
1407         struct ip_sf_list *psf, *psf_prev;
1408         int rv = 0;
1409
1410         psf_prev = NULL;
1411         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1412                 if (psf->sf_inaddr == *psfsrc)
1413                         break;
1414                 psf_prev = psf;
1415         }
1416         if (!psf || psf->sf_count[sfmode] == 0) {
1417                 /* source filter not found, or count wrong =>  bug */
1418                 return -ESRCH;
1419         }
1420         psf->sf_count[sfmode]--;
1421         if (psf->sf_count[sfmode] == 0) {
1422                 ip_rt_multicast_event(pmc->interface);
1423         }
1424         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1425 #ifdef CONFIG_IP_MULTICAST
1426                 struct in_device *in_dev = pmc->interface;
1427 #endif
1428
1429                 /* no more filters for this source */
1430                 if (psf_prev)
1431                         psf_prev->sf_next = psf->sf_next;
1432                 else
1433                         pmc->sources = psf->sf_next;
1434 #ifdef CONFIG_IP_MULTICAST
1435                 if (psf->sf_oldin &&
1436                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1437                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1438                                 IGMP_Unsolicited_Report_Count;
1439                         psf->sf_next = pmc->tomb;
1440                         pmc->tomb = psf;
1441                         rv = 1;
1442                 } else
1443 #endif
1444                         kfree(psf);
1445         }
1446         return rv;
1447 }
1448
1449 #ifndef CONFIG_IP_MULTICAST
1450 #define igmp_ifc_event(x)       do { } while (0)
1451 #endif
1452
1453 static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1454                          int sfcount, __u32 *psfsrc, int delta)
1455 {
1456         struct ip_mc_list *pmc;
1457         int     changerec = 0;
1458         int     i, err;
1459
1460         if (!in_dev)
1461                 return -ENODEV;
1462         read_lock(&in_dev->mc_list_lock);
1463         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1464                 if (*pmca == pmc->multiaddr)
1465                         break;
1466         }
1467         if (!pmc) {
1468                 /* MCA not found?? bug */
1469                 read_unlock(&in_dev->mc_list_lock);
1470                 return -ESRCH;
1471         }
1472         spin_lock_bh(&pmc->lock);
1473         read_unlock(&in_dev->mc_list_lock);
1474 #ifdef CONFIG_IP_MULTICAST
1475         sf_markstate(pmc);
1476 #endif
1477         if (!delta) {
1478                 err = -EINVAL;
1479                 if (!pmc->sfcount[sfmode])
1480                         goto out_unlock;
1481                 pmc->sfcount[sfmode]--;
1482         }
1483         err = 0;
1484         for (i=0; i<sfcount; i++) {
1485                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1486
1487                 changerec |= rv > 0;
1488                 if (!err && rv < 0)
1489                         err = rv;
1490         }
1491         if (pmc->sfmode == MCAST_EXCLUDE &&
1492             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1493             pmc->sfcount[MCAST_INCLUDE]) {
1494 #ifdef CONFIG_IP_MULTICAST
1495                 struct ip_sf_list *psf;
1496 #endif
1497
1498                 /* filter mode change */
1499                 pmc->sfmode = MCAST_INCLUDE;
1500 #ifdef CONFIG_IP_MULTICAST
1501                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1502                         IGMP_Unsolicited_Report_Count;
1503                 in_dev->mr_ifc_count = pmc->crcount;
1504                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1505                         psf->sf_crcount = 0;
1506                 igmp_ifc_event(pmc->interface);
1507         } else if (sf_setstate(pmc) || changerec) {
1508                 igmp_ifc_event(pmc->interface);
1509 #endif
1510         }
1511 out_unlock:
1512         spin_unlock_bh(&pmc->lock);
1513         return err;
1514 }
1515
1516 /*
1517  * Add multicast single-source filter to the interface list
1518  */
1519 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1520         __u32 *psfsrc, int delta)
1521 {
1522         struct ip_sf_list *psf, *psf_prev;
1523
1524         psf_prev = NULL;
1525         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1526                 if (psf->sf_inaddr == *psfsrc)
1527                         break;
1528                 psf_prev = psf;
1529         }
1530         if (!psf) {
1531                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1532                 if (!psf)
1533                         return -ENOBUFS;
1534                 psf->sf_inaddr = *psfsrc;
1535                 if (psf_prev) {
1536                         psf_prev->sf_next = psf;
1537                 } else
1538                         pmc->sources = psf;
1539         }
1540         psf->sf_count[sfmode]++;
1541         if (psf->sf_count[sfmode] == 1) {
1542                 ip_rt_multicast_event(pmc->interface);
1543         }
1544         return 0;
1545 }
1546
1547 #ifdef CONFIG_IP_MULTICAST
1548 static void sf_markstate(struct ip_mc_list *pmc)
1549 {
1550         struct ip_sf_list *psf;
1551         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1552
1553         for (psf=pmc->sources; psf; psf=psf->sf_next)
1554                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1555                         psf->sf_oldin = mca_xcount ==
1556                                 psf->sf_count[MCAST_EXCLUDE] &&
1557                                 !psf->sf_count[MCAST_INCLUDE];
1558                 } else
1559                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1560 }
1561
1562 static int sf_setstate(struct ip_mc_list *pmc)
1563 {
1564         struct ip_sf_list *psf, *dpsf;
1565         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1566         int qrv = pmc->interface->mr_qrv;
1567         int new_in, rv;
1568
1569         rv = 0;
1570         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1571                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1572                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1573                                 !psf->sf_count[MCAST_INCLUDE];
1574                 } else
1575                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1576                 if (new_in) {
1577                         if (!psf->sf_oldin) {
1578                                 struct ip_sf_list *prev = NULL;
1579
1580                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1581                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1582                                                 break;
1583                                         prev = dpsf;
1584                                 }
1585                                 if (dpsf) {
1586                                         if (prev)
1587                                                 prev->sf_next = dpsf->sf_next;
1588                                         else
1589                                                 pmc->tomb = dpsf->sf_next;
1590                                         kfree(dpsf);
1591                                 }
1592                                 psf->sf_crcount = qrv;
1593                                 rv++;
1594                         }
1595                 } else if (psf->sf_oldin) {
1596
1597                         psf->sf_crcount = 0;
1598                         /*
1599                          * add or update "delete" records if an active filter
1600                          * is now inactive
1601                          */
1602                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1603                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1604                                         break;
1605                         if (!dpsf) {
1606                                 dpsf = (struct ip_sf_list *)
1607                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1608                                 if (!dpsf)
1609                                         continue;
1610                                 *dpsf = *psf;
1611                                 /* pmc->lock held by callers */
1612                                 dpsf->sf_next = pmc->tomb;
1613                                 pmc->tomb = dpsf;
1614                         }
1615                         dpsf->sf_crcount = qrv;
1616                         rv++;
1617                 }
1618         }
1619         return rv;
1620 }
1621 #endif
1622
1623 /*
1624  * Add multicast source filter list to the interface list
1625  */
1626 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1627                          int sfcount, __u32 *psfsrc, int delta)
1628 {
1629         struct ip_mc_list *pmc;
1630         int     isexclude;
1631         int     i, err;
1632
1633         if (!in_dev)
1634                 return -ENODEV;
1635         read_lock(&in_dev->mc_list_lock);
1636         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1637                 if (*pmca == pmc->multiaddr)
1638                         break;
1639         }
1640         if (!pmc) {
1641                 /* MCA not found?? bug */
1642                 read_unlock(&in_dev->mc_list_lock);
1643                 return -ESRCH;
1644         }
1645         spin_lock_bh(&pmc->lock);
1646         read_unlock(&in_dev->mc_list_lock);
1647
1648 #ifdef CONFIG_IP_MULTICAST
1649         sf_markstate(pmc);
1650 #endif
1651         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1652         if (!delta)
1653                 pmc->sfcount[sfmode]++;
1654         err = 0;
1655         for (i=0; i<sfcount; i++) {
1656                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1657                 if (err)
1658                         break;
1659         }
1660         if (err) {
1661                 int j;
1662
1663                 pmc->sfcount[sfmode]--;
1664                 for (j=0; j<i; j++)
1665                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1666         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1667 #ifdef CONFIG_IP_MULTICAST
1668                 struct in_device *in_dev = pmc->interface;
1669                 struct ip_sf_list *psf;
1670 #endif
1671
1672                 /* filter mode change */
1673                 if (pmc->sfcount[MCAST_EXCLUDE])
1674                         pmc->sfmode = MCAST_EXCLUDE;
1675                 else if (pmc->sfcount[MCAST_INCLUDE])
1676                         pmc->sfmode = MCAST_INCLUDE;
1677 #ifdef CONFIG_IP_MULTICAST
1678                 /* else no filters; keep old mode for reports */
1679
1680                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1681                         IGMP_Unsolicited_Report_Count;
1682                 in_dev->mr_ifc_count = pmc->crcount;
1683                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1684                         psf->sf_crcount = 0;
1685                 igmp_ifc_event(in_dev);
1686         } else if (sf_setstate(pmc)) {
1687                 igmp_ifc_event(in_dev);
1688 #endif
1689         }
1690         spin_unlock_bh(&pmc->lock);
1691         return err;
1692 }
1693
1694 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1695 {
1696         struct ip_sf_list *psf, *nextpsf;
1697
1698         for (psf=pmc->tomb; psf; psf=nextpsf) {
1699                 nextpsf = psf->sf_next;
1700                 kfree(psf);
1701         }
1702         pmc->tomb = NULL;
1703         for (psf=pmc->sources; psf; psf=nextpsf) {
1704                 nextpsf = psf->sf_next;
1705                 kfree(psf);
1706         }
1707         pmc->sources = NULL;
1708         pmc->sfmode = MCAST_EXCLUDE;
1709         pmc->sfcount[MCAST_INCLUDE] = 0;
1710         pmc->sfcount[MCAST_EXCLUDE] = 1;
1711 }
1712
1713
1714 /*
1715  * Join a multicast group
1716  */
1717 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1718 {
1719         int err;
1720         u32 addr = imr->imr_multiaddr.s_addr;
1721         struct ip_mc_socklist *iml=NULL, *i;
1722         struct in_device *in_dev;
1723         struct inet_sock *inet = inet_sk(sk);
1724         int ifindex;
1725         int count = 0;
1726
1727         if (!MULTICAST(addr))
1728                 return -EINVAL;
1729
1730         rtnl_lock();
1731
1732         in_dev = ip_mc_find_dev(imr);
1733
1734         if (!in_dev) {
1735                 iml = NULL;
1736                 err = -ENODEV;
1737                 goto done;
1738         }
1739
1740         err = -EADDRINUSE;
1741         ifindex = imr->imr_ifindex;
1742         for (i = inet->mc_list; i; i = i->next) {
1743                 if (i->multi.imr_multiaddr.s_addr == addr &&
1744                     i->multi.imr_ifindex == ifindex)
1745                         goto done;
1746                 count++;
1747         }
1748         err = -ENOBUFS;
1749         if (count >= sysctl_igmp_max_memberships)
1750                 goto done;
1751         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1752         if (iml == NULL)
1753                 goto done;
1754
1755         memcpy(&iml->multi, imr, sizeof(*imr));
1756         iml->next = inet->mc_list;
1757         iml->sflist = NULL;
1758         iml->sfmode = MCAST_EXCLUDE;
1759         inet->mc_list = iml;
1760         ip_mc_inc_group(in_dev, addr);
1761         err = 0;
1762 done:
1763         rtnl_unlock();
1764         return err;
1765 }
1766
1767 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1768                            struct in_device *in_dev)
1769 {
1770         int err;
1771
1772         if (iml->sflist == 0) {
1773                 /* any-source empty exclude case */
1774                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1775                         iml->sfmode, 0, NULL, 0);
1776         }
1777         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1778                         iml->sfmode, iml->sflist->sl_count,
1779                         iml->sflist->sl_addr, 0);
1780         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1781         iml->sflist = NULL;
1782         return err;
1783 }
1784
1785 /*
1786  *      Ask a socket to leave a group.
1787  */
1788
1789 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1790 {
1791         struct inet_sock *inet = inet_sk(sk);
1792         struct ip_mc_socklist *iml, **imlp;
1793         struct in_device *in_dev;
1794         u32 group = imr->imr_multiaddr.s_addr;
1795         u32 ifindex;
1796         int ret = -EADDRNOTAVAIL;
1797
1798         rtnl_lock();
1799         in_dev = ip_mc_find_dev(imr);
1800         ifindex = imr->imr_ifindex;
1801         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1802                 if (iml->multi.imr_multiaddr.s_addr != group)
1803                         continue;
1804                 if (ifindex) {
1805                         if (iml->multi.imr_ifindex != ifindex)
1806                                 continue;
1807                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1808                                 iml->multi.imr_address.s_addr)
1809                         continue;
1810
1811                 (void) ip_mc_leave_src(sk, iml, in_dev);
1812
1813                 *imlp = iml->next;
1814
1815                 if (in_dev)
1816                         ip_mc_dec_group(in_dev, group);
1817                 rtnl_unlock();
1818                 sock_kfree_s(sk, iml, sizeof(*iml));
1819                 return 0;
1820         }
1821         if (!in_dev)
1822                 ret = -ENODEV;
1823         rtnl_unlock();
1824         return ret;
1825 }
1826
1827 int ip_mc_source(int add, int omode, struct sock *sk, struct
1828         ip_mreq_source *mreqs, int ifindex)
1829 {
1830         int err;
1831         struct ip_mreqn imr;
1832         u32 addr = mreqs->imr_multiaddr;
1833         struct ip_mc_socklist *pmc;
1834         struct in_device *in_dev = NULL;
1835         struct inet_sock *inet = inet_sk(sk);
1836         struct ip_sf_socklist *psl;
1837         int leavegroup = 0;
1838         int i, j, rv;
1839
1840         if (!MULTICAST(addr))
1841                 return -EINVAL;
1842
1843         rtnl_lock();
1844
1845         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1846         imr.imr_address.s_addr = mreqs->imr_interface;
1847         imr.imr_ifindex = ifindex;
1848         in_dev = ip_mc_find_dev(&imr);
1849
1850         if (!in_dev) {
1851                 err = -ENODEV;
1852                 goto done;
1853         }
1854         err = -EADDRNOTAVAIL;
1855
1856         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1857                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1858                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1859                         break;
1860         }
1861         if (!pmc) {             /* must have a prior join */
1862                 err = -EINVAL;
1863                 goto done;
1864         }
1865         /* if a source filter was set, must be the same mode as before */
1866         if (pmc->sflist) {
1867                 if (pmc->sfmode != omode) {
1868                         err = -EINVAL;
1869                         goto done;
1870                 }
1871         } else if (pmc->sfmode != omode) {
1872                 /* allow mode switches for empty-set filters */
1873                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1874                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1875                         NULL, 0);
1876                 pmc->sfmode = omode;
1877         }
1878
1879         psl = pmc->sflist;
1880         if (!add) {
1881                 if (!psl)
1882                         goto done;      /* err = -EADDRNOTAVAIL */
1883                 rv = !0;
1884                 for (i=0; i<psl->sl_count; i++) {
1885                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1886                                 sizeof(__u32));
1887                         if (rv == 0)
1888                                 break;
1889                 }
1890                 if (rv)         /* source not found */
1891                         goto done;      /* err = -EADDRNOTAVAIL */
1892
1893                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1894                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1895                         leavegroup = 1;
1896                         goto done;
1897                 }
1898
1899                 /* update the interface filter */
1900                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1901                         &mreqs->imr_sourceaddr, 1);
1902
1903                 for (j=i+1; j<psl->sl_count; j++)
1904                         psl->sl_addr[j-1] = psl->sl_addr[j];
1905                 psl->sl_count--;
1906                 err = 0;
1907                 goto done;
1908         }
1909         /* else, add a new source to the filter */
1910
1911         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1912                 err = -ENOBUFS;
1913                 goto done;
1914         }
1915         if (!psl || psl->sl_count == psl->sl_max) {
1916                 struct ip_sf_socklist *newpsl;
1917                 int count = IP_SFBLOCK;
1918
1919                 if (psl)
1920                         count += psl->sl_max;
1921                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1922                 if (!newpsl) {
1923                         err = -ENOBUFS;
1924                         goto done;
1925                 }
1926                 newpsl->sl_max = count;
1927                 newpsl->sl_count = count - IP_SFBLOCK;
1928                 if (psl) {
1929                         for (i=0; i<psl->sl_count; i++)
1930                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1931                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1932                 }
1933                 pmc->sflist = psl = newpsl;
1934         }
1935         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1936         for (i=0; i<psl->sl_count; i++) {
1937                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1938                         sizeof(__u32));
1939                 if (rv == 0)
1940                         break;
1941         }
1942         if (rv == 0)            /* address already there is an error */
1943                 goto done;
1944         for (j=psl->sl_count-1; j>=i; j--)
1945                 psl->sl_addr[j+1] = psl->sl_addr[j];
1946         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1947         psl->sl_count++;
1948         err = 0;
1949         /* update the interface list */
1950         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1951                 &mreqs->imr_sourceaddr, 1);
1952 done:
1953         rtnl_unlock();
1954         if (leavegroup)
1955                 return ip_mc_leave_group(sk, &imr);
1956         return err;
1957 }
1958
1959 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1960 {
1961         int err = 0;
1962         struct ip_mreqn imr;
1963         u32 addr = msf->imsf_multiaddr;
1964         struct ip_mc_socklist *pmc;
1965         struct in_device *in_dev;
1966         struct inet_sock *inet = inet_sk(sk);
1967         struct ip_sf_socklist *newpsl, *psl;
1968         int leavegroup = 0;
1969
1970         if (!MULTICAST(addr))
1971                 return -EINVAL;
1972         if (msf->imsf_fmode != MCAST_INCLUDE &&
1973             msf->imsf_fmode != MCAST_EXCLUDE)
1974                 return -EINVAL;
1975
1976         rtnl_lock();
1977
1978         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1979         imr.imr_address.s_addr = msf->imsf_interface;
1980         imr.imr_ifindex = ifindex;
1981         in_dev = ip_mc_find_dev(&imr);
1982
1983         if (!in_dev) {
1984                 err = -ENODEV;
1985                 goto done;
1986         }
1987
1988         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1989         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
1990                 leavegroup = 1;
1991                 goto done;
1992         }
1993
1994         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1995                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1996                     pmc->multi.imr_ifindex == imr.imr_ifindex)
1997                         break;
1998         }
1999         if (!pmc) {             /* must have a prior join */
2000                 err = -EINVAL;
2001                 goto done;
2002         }
2003         if (msf->imsf_numsrc) {
2004                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2005                                                            GFP_KERNEL);
2006                 if (!newpsl) {
2007                         err = -ENOBUFS;
2008                         goto done;
2009                 }
2010                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2011                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2012                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2013                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2014                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2015                 if (err) {
2016                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2017                         goto done;
2018                 }
2019         } else {
2020                 newpsl = NULL;
2021                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2022                                      msf->imsf_fmode, 0, NULL, 0);
2023         }
2024         psl = pmc->sflist;
2025         if (psl) {
2026                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2027                         psl->sl_count, psl->sl_addr, 0);
2028                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2029         } else
2030                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2031                         0, NULL, 0);
2032         pmc->sflist = newpsl;
2033         pmc->sfmode = msf->imsf_fmode;
2034         err = 0;
2035 done:
2036         rtnl_unlock();
2037         if (leavegroup)
2038                 err = ip_mc_leave_group(sk, &imr);
2039         return err;
2040 }
2041
2042 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2043         struct ip_msfilter __user *optval, int __user *optlen)
2044 {
2045         int err, len, count, copycount;
2046         struct ip_mreqn imr;
2047         u32 addr = msf->imsf_multiaddr;
2048         struct ip_mc_socklist *pmc;
2049         struct in_device *in_dev;
2050         struct inet_sock *inet = inet_sk(sk);
2051         struct ip_sf_socklist *psl;
2052
2053         if (!MULTICAST(addr))
2054                 return -EINVAL;
2055
2056         rtnl_lock();
2057
2058         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2059         imr.imr_address.s_addr = msf->imsf_interface;
2060         imr.imr_ifindex = 0;
2061         in_dev = ip_mc_find_dev(&imr);
2062
2063         if (!in_dev) {
2064                 err = -ENODEV;
2065                 goto done;
2066         }
2067         err = -EADDRNOTAVAIL;
2068
2069         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2070                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2071                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2072                         break;
2073         }
2074         if (!pmc)               /* must have a prior join */
2075                 goto done;
2076         msf->imsf_fmode = pmc->sfmode;
2077         psl = pmc->sflist;
2078         rtnl_unlock();
2079         if (!psl) {
2080                 len = 0;
2081                 count = 0;
2082         } else {
2083                 count = psl->sl_count;
2084         }
2085         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2086         len = copycount * sizeof(psl->sl_addr[0]);
2087         msf->imsf_numsrc = count;
2088         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2089             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2090                 return -EFAULT;
2091         }
2092         if (len &&
2093             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2094                 return -EFAULT;
2095         return 0;
2096 done:
2097         rtnl_unlock();
2098         return err;
2099 }
2100
2101 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2102         struct group_filter __user *optval, int __user *optlen)
2103 {
2104         int err, i, count, copycount;
2105         struct sockaddr_in *psin;
2106         u32 addr;
2107         struct ip_mc_socklist *pmc;
2108         struct inet_sock *inet = inet_sk(sk);
2109         struct ip_sf_socklist *psl;
2110
2111         psin = (struct sockaddr_in *)&gsf->gf_group;
2112         if (psin->sin_family != AF_INET)
2113                 return -EINVAL;
2114         addr = psin->sin_addr.s_addr;
2115         if (!MULTICAST(addr))
2116                 return -EINVAL;
2117
2118         rtnl_lock();
2119
2120         err = -EADDRNOTAVAIL;
2121
2122         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2123                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2124                     pmc->multi.imr_ifindex == gsf->gf_interface)
2125                         break;
2126         }
2127         if (!pmc)               /* must have a prior join */
2128                 goto done;
2129         gsf->gf_fmode = pmc->sfmode;
2130         psl = pmc->sflist;
2131         rtnl_unlock();
2132         count = psl ? psl->sl_count : 0;
2133         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2134         gsf->gf_numsrc = count;
2135         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2136             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2137                 return -EFAULT;
2138         }
2139         for (i=0; i<copycount; i++) {
2140                 struct sockaddr_in *psin;
2141                 struct sockaddr_storage ss;
2142
2143                 psin = (struct sockaddr_in *)&ss;
2144                 memset(&ss, 0, sizeof(ss));
2145                 psin->sin_family = AF_INET;
2146                 psin->sin_addr.s_addr = psl->sl_addr[i];
2147                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2148                         return -EFAULT;
2149         }
2150         return 0;
2151 done:
2152         rtnl_unlock();
2153         return err;
2154 }
2155
2156 /*
2157  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2158  */
2159 int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
2160 {
2161         struct inet_sock *inet = inet_sk(sk);
2162         struct ip_mc_socklist *pmc;
2163         struct ip_sf_socklist *psl;
2164         int i;
2165
2166         if (!MULTICAST(loc_addr))
2167                 return 1;
2168
2169         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2170                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2171                     pmc->multi.imr_ifindex == dif)
2172                         break;
2173         }
2174         if (!pmc)
2175                 return 1;
2176         psl = pmc->sflist;
2177         if (!psl)
2178                 return pmc->sfmode == MCAST_EXCLUDE;
2179
2180         for (i=0; i<psl->sl_count; i++) {
2181                 if (psl->sl_addr[i] == rmt_addr)
2182                         break;
2183         }
2184         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2185                 return 0;
2186         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2187                 return 0;
2188         return 1;
2189 }
2190
2191 /*
2192  *      A socket is closing.
2193  */
2194
2195 void ip_mc_drop_socket(struct sock *sk)
2196 {
2197         struct inet_sock *inet = inet_sk(sk);
2198         struct ip_mc_socklist *iml;
2199
2200         if (inet->mc_list == NULL)
2201                 return;
2202
2203         rtnl_lock();
2204         while ((iml = inet->mc_list) != NULL) {
2205                 struct in_device *in_dev;
2206                 inet->mc_list = iml->next;
2207
2208                 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
2209                 (void) ip_mc_leave_src(sk, iml, in_dev);
2210                 if (in_dev != NULL) {
2211                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2212                         in_dev_put(in_dev);
2213                 }
2214                 sock_kfree_s(sk, iml, sizeof(*iml));
2215         }
2216         rtnl_unlock();
2217 }
2218
2219 int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto)
2220 {
2221         struct ip_mc_list *im;
2222         struct ip_sf_list *psf;
2223         int rv = 0;
2224
2225         read_lock(&in_dev->mc_list_lock);
2226         for (im=in_dev->mc_list; im; im=im->next) {
2227                 if (im->multiaddr == mc_addr)
2228                         break;
2229         }
2230         if (im && proto == IPPROTO_IGMP) {
2231                 rv = 1;
2232         } else if (im) {
2233                 if (src_addr) {
2234                         for (psf=im->sources; psf; psf=psf->sf_next) {
2235                                 if (psf->sf_inaddr == src_addr)
2236                                         break;
2237                         }
2238                         if (psf)
2239                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2240                                         psf->sf_count[MCAST_EXCLUDE] !=
2241                                         im->sfcount[MCAST_EXCLUDE];
2242                         else
2243                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2244                 } else
2245                         rv = 1; /* unspecified source; tentatively allow */
2246         }
2247         read_unlock(&in_dev->mc_list_lock);
2248         return rv;
2249 }
2250
2251 #if defined(CONFIG_PROC_FS)
2252 struct igmp_mc_iter_state {
2253         struct net_device *dev;
2254         struct in_device *in_dev;
2255 };
2256
2257 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2258
2259 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2260 {
2261         struct ip_mc_list *im = NULL;
2262         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2263
2264         for (state->dev = dev_base, state->in_dev = NULL;
2265              state->dev;
2266              state->dev = state->dev->next) {
2267                 struct in_device *in_dev;
2268                 in_dev = in_dev_get(state->dev);
2269                 if (!in_dev)
2270                         continue;
2271                 read_lock(&in_dev->mc_list_lock);
2272                 im = in_dev->mc_list;
2273                 if (im) {
2274                         state->in_dev = in_dev;
2275                         break;
2276                 }
2277                 read_unlock(&in_dev->mc_list_lock);
2278                 in_dev_put(in_dev);
2279         }
2280         return im;
2281 }
2282
2283 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2284 {
2285         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2286         im = im->next;
2287         while (!im) {
2288                 if (likely(state->in_dev != NULL)) {
2289                         read_unlock(&state->in_dev->mc_list_lock);
2290                         in_dev_put(state->in_dev);
2291                 }
2292                 state->dev = state->dev->next;
2293                 if (!state->dev) {
2294                         state->in_dev = NULL;
2295                         break;
2296                 }
2297                 state->in_dev = in_dev_get(state->dev);
2298                 if (!state->in_dev)
2299                         continue;
2300                 read_lock(&state->in_dev->mc_list_lock);
2301                 im = state->in_dev->mc_list;
2302         }
2303         return im;
2304 }
2305
2306 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2307 {
2308         struct ip_mc_list *im = igmp_mc_get_first(seq);
2309         if (im)
2310                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2311                         --pos;
2312         return pos ? NULL : im;
2313 }
2314
2315 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2316 {
2317         read_lock(&dev_base_lock);
2318         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2319 }
2320
2321 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2322 {
2323         struct ip_mc_list *im;
2324         if (v == SEQ_START_TOKEN)
2325                 im = igmp_mc_get_first(seq);
2326         else
2327                 im = igmp_mc_get_next(seq, v);
2328         ++*pos;
2329         return im;
2330 }
2331
2332 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2333 {
2334         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2335         if (likely(state->in_dev != NULL)) {
2336                 read_unlock(&state->in_dev->mc_list_lock);
2337                 in_dev_put(state->in_dev);
2338                 state->in_dev = NULL;
2339         }
2340         state->dev = NULL;
2341         read_unlock(&dev_base_lock);
2342 }
2343
2344 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2345 {
2346         if (v == SEQ_START_TOKEN)
2347                 seq_puts(seq,
2348                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2349         else {
2350                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2351                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2352                 char   *querier;
2353 #ifdef CONFIG_IP_MULTICAST
2354                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2355                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2356                           "V3";
2357 #else
2358                 querier = "NONE";
2359 #endif
2360
2361                 if (state->in_dev->mc_list == im) {
2362                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2363                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2364                 }
2365
2366                 seq_printf(seq,
2367                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2368                            im->multiaddr, im->users,
2369                            im->tm_running, im->tm_running ?
2370                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2371                            im->reporter);
2372         }
2373         return 0;
2374 }
2375
2376 static struct seq_operations igmp_mc_seq_ops = {
2377         .start  =       igmp_mc_seq_start,
2378         .next   =       igmp_mc_seq_next,
2379         .stop   =       igmp_mc_seq_stop,
2380         .show   =       igmp_mc_seq_show,
2381 };
2382
2383 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2384 {
2385         struct seq_file *seq;
2386         int rc = -ENOMEM;
2387         struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2388
2389         if (!s)
2390                 goto out;
2391         rc = seq_open(file, &igmp_mc_seq_ops);
2392         if (rc)
2393                 goto out_kfree;
2394
2395         seq = file->private_data;
2396         seq->private = s;
2397 out:
2398         return rc;
2399 out_kfree:
2400         kfree(s);
2401         goto out;
2402 }
2403
2404 static struct file_operations igmp_mc_seq_fops = {
2405         .owner          =       THIS_MODULE,
2406         .open           =       igmp_mc_seq_open,
2407         .read           =       seq_read,
2408         .llseek         =       seq_lseek,
2409         .release        =       seq_release_private,
2410 };
2411
2412 struct igmp_mcf_iter_state {
2413         struct net_device *dev;
2414         struct in_device *idev;
2415         struct ip_mc_list *im;
2416 };
2417
2418 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2419
2420 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2421 {
2422         struct ip_sf_list *psf = NULL;
2423         struct ip_mc_list *im = NULL;
2424         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2425
2426         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2427              state->dev;
2428              state->dev = state->dev->next) {
2429                 struct in_device *idev;
2430                 idev = in_dev_get(state->dev);
2431                 if (unlikely(idev == NULL))
2432                         continue;
2433                 read_lock(&idev->mc_list_lock);
2434                 im = idev->mc_list;
2435                 if (likely(im != NULL)) {
2436                         spin_lock_bh(&im->lock);
2437                         psf = im->sources;
2438                         if (likely(psf != NULL)) {
2439                                 state->im = im;
2440                                 state->idev = idev;
2441                                 break;
2442                         }
2443                         spin_unlock_bh(&im->lock);
2444                 }
2445                 read_unlock(&idev->mc_list_lock);
2446                 in_dev_put(idev);
2447         }
2448         return psf;
2449 }
2450
2451 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2452 {
2453         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2454
2455         psf = psf->sf_next;
2456         while (!psf) {
2457                 spin_unlock_bh(&state->im->lock);
2458                 state->im = state->im->next;
2459                 while (!state->im) {
2460                         if (likely(state->idev != NULL)) {
2461                                 read_unlock(&state->idev->mc_list_lock);
2462                                 in_dev_put(state->idev);
2463                         }
2464                         state->dev = state->dev->next;
2465                         if (!state->dev) {
2466                                 state->idev = NULL;
2467                                 goto out;
2468                         }
2469                         state->idev = in_dev_get(state->dev);
2470                         if (!state->idev)
2471                                 continue;
2472                         read_lock(&state->idev->mc_list_lock);
2473                         state->im = state->idev->mc_list;
2474                 }
2475                 if (!state->im)
2476                         break;
2477                 spin_lock_bh(&state->im->lock);
2478                 psf = state->im->sources;
2479         }
2480 out:
2481         return psf;
2482 }
2483
2484 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2485 {
2486         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2487         if (psf)
2488                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2489                         --pos;
2490         return pos ? NULL : psf;
2491 }
2492
2493 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2494 {
2495         read_lock(&dev_base_lock);
2496         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2497 }
2498
2499 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2500 {
2501         struct ip_sf_list *psf;
2502         if (v == SEQ_START_TOKEN)
2503                 psf = igmp_mcf_get_first(seq);
2504         else
2505                 psf = igmp_mcf_get_next(seq, v);
2506         ++*pos;
2507         return psf;
2508 }
2509
2510 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2511 {
2512         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2513         if (likely(state->im != NULL)) {
2514                 spin_unlock_bh(&state->im->lock);
2515                 state->im = NULL;
2516         }
2517         if (likely(state->idev != NULL)) {
2518                 read_unlock(&state->idev->mc_list_lock);
2519                 in_dev_put(state->idev);
2520                 state->idev = NULL;
2521         }
2522         state->dev = NULL;
2523         read_unlock(&dev_base_lock);
2524 }
2525
2526 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2527 {
2528         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2529         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2530
2531         if (v == SEQ_START_TOKEN) {
2532                 seq_printf(seq,
2533                            "%3s %6s "
2534                            "%10s %10s %6s %6s\n", "Idx",
2535                            "Device", "MCA",
2536                            "SRC", "INC", "EXC");
2537         } else {
2538                 seq_printf(seq,
2539                            "%3d %6.6s 0x%08x "
2540                            "0x%08x %6lu %6lu\n",
2541                            state->dev->ifindex, state->dev->name,
2542                            ntohl(state->im->multiaddr),
2543                            ntohl(psf->sf_inaddr),
2544                            psf->sf_count[MCAST_INCLUDE],
2545                            psf->sf_count[MCAST_EXCLUDE]);
2546         }
2547         return 0;
2548 }
2549
2550 static struct seq_operations igmp_mcf_seq_ops = {
2551         .start  =       igmp_mcf_seq_start,
2552         .next   =       igmp_mcf_seq_next,
2553         .stop   =       igmp_mcf_seq_stop,
2554         .show   =       igmp_mcf_seq_show,
2555 };
2556
2557 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2558 {
2559         struct seq_file *seq;
2560         int rc = -ENOMEM;
2561         struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2562
2563         if (!s)
2564                 goto out;
2565         rc = seq_open(file, &igmp_mcf_seq_ops);
2566         if (rc)
2567                 goto out_kfree;
2568
2569         seq = file->private_data;
2570         seq->private = s;
2571 out:
2572         return rc;
2573 out_kfree:
2574         kfree(s);
2575         goto out;
2576 }
2577
2578 static struct file_operations igmp_mcf_seq_fops = {
2579         .owner          =       THIS_MODULE,
2580         .open           =       igmp_mcf_seq_open,
2581         .read           =       seq_read,
2582         .llseek         =       seq_lseek,
2583         .release        =       seq_release_private,
2584 };
2585
2586 int __init igmp_mc_proc_init(void)
2587 {
2588         proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2589         proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2590         return 0;
2591 }
2592 #endif
2593
2594 EXPORT_SYMBOL(ip_mc_dec_group);
2595 EXPORT_SYMBOL(ip_mc_inc_group);
2596 EXPORT_SYMBOL(ip_mc_join_group);