net/ipv4/igmp.c

   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Authors:
  12  *              Alan Cox <Alan.Cox@linux.org>
  13  *
  14  *      This program is free software; you can redistribute it and/or
  15  *      modify it under the terms of the GNU General Public License
  16  *      as published by the Free Software Foundation; either version
  17  *      2 of the License, or (at your option) any later version.
  18  *
  19  *      Fixes:
  20  *
  21  *              Alan Cox        :       Added lots of __inline__ to optimise
  22  *                                      the memory usage of all the tiny little
  23  *                                      functions.
  24  *              Alan Cox        :       Dumped the header building experiment.
  25  *              Alan Cox        :       Minor tweaks ready for multicast routing
  26  *                                      and extended IGMP protocol.
  27  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  28  *                                      writes utterly bogus code otherwise (sigh)
  29  *                                      fixed IGMP loopback to behave in the manner
  30  *                                      desired by mrouted, fixed the fact it has been
  31  *                                      broken since 1.3.6 and cleaned up a few minor
  32  *                                      points.
  33  *
  34  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  35  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  36  *                                      The enhancements are mainly based on Steve Deering's
  37  *                                      ipmulti-3.5 source code.
  38  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  39  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  40  *                                      the mrouted version on that device.
  41  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  42  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  43  *                                      to identify the multicast router version
  44  *                                      and do what the IGMP version 2 specified.
  45  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  46  *              Tsu-Sheng Tsao          if the specified time expired.
  47  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  48  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  49  *              Christian Daudt :       igmp timer wasn't set for local group
  50  *                                      memberships but was being deleted,
  51  *                                      which caused a "del_timer() called
  52  *                                      from %p with timer not initialized\n"
  53  *                                      message (960131).
  54  *              Christian Daudt :       removed del_timer from
  55  *                                      igmp_timer_expire function (960205).
  56  *             Christian Daudt :       igmp_heard_report now only calls
  57  *                                     igmp_timer_expire if tm->running is
  58  *                                     true (960216).
  59  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  60  *                                      igmp_heard_query never trigger. Expiry
  61  *                                      miscalculation fixed in igmp_heard_query
  62  *                                      and random() made to return unsigned to
  63  *                                      prevent negative expiry times.
  64  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  65  *                                      fix from pending 2.1.x patches.
  66  *              Alan Cox:               Forget to enable FDDI support earlier.
  67  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  68  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  69  *              David L Stevens:        IGMPv3 support, with help from
  70  *                                      Vinay Kulkarni
  71  */
  72
  73 #include <linux/module.h>
  74 #include <asm/uaccess.h>
  75 #include <asm/system.h>
  76 #include <linux/types.h>
  77 #include <linux/kernel.h>
  78 #include <linux/jiffies.h>
  79 #include <linux/string.h>
  80 #include <linux/socket.h>
  81 #include <linux/sockios.h>
  82 #include <linux/in.h>
  83 #include <linux/inet.h>
  84 #include <linux/netdevice.h>
  85 #include <linux/skbuff.h>
  86 #include <linux/inetdevice.h>
  87 #include <linux/igmp.h>
  88 #include <linux/if_arp.h>
  89 #include <linux/rtnetlink.h>
  90 #include <linux/times.h>
  91
  92 #include <net/net_namespace.h>
  93 #include <net/arp.h>
  94 #include <net/ip.h>
  95 #include <net/protocol.h>
  96 #include <net/route.h>
  97 #include <net/sock.h>
  98 #include <net/checksum.h>
  99 #include <linux/netfilter_ipv4.h>
 100 #ifdef CONFIG_IP_MROUTE
 101 #include <linux/mroute.h>
 102 #endif
 103 #ifdef CONFIG_PROC_FS
 104 #include <linux/proc_fs.h>
 105 #include <linux/seq_file.h>
 106 #endif
 107
 108 #define IP_MAX_MEMBERSHIPS      20
 109 #define IP_MAX_MSF              10
 110
 111 #ifdef CONFIG_IP_MULTICAST
 112 /* Parameter names and values are taken from igmp-v2-06 draft */
 113
 114 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 115 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 116 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 117 #define IGMP_Query_Response_Interval            (10*HZ)
 118 #define IGMP_Unsolicited_Report_Count           2
 119
 120
 121 #define IGMP_Initial_Report_Delay               (1)
 122
 123 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 124  * IGMP specs require to report membership immediately after
 125  * joining a group, but we delay the first report by a
 126  * small interval. It seems more natural and still does not
 127  * contradict to specs provided this delay is small enough.
 128  */
 129
 130 #define IGMP_V1_SEEN(in_dev) \
 131         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 132          IN_DEV_CONF_GET((in_dev), 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) \
 136         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 137          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 138          ((in_dev)->mr_v2_seen && \
 139           time_before(jiffies, (in_dev)->mr_v2_seen)))
 140
 141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 143 static void igmpv3_clear_delrec(struct in_device *in_dev);
 144 static int sf_setstate(struct ip_mc_list *pmc);
 145 static void sf_markstate(struct ip_mc_list *pmc);
 146 #endif
 147 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 149                          int sfcount, __be32 *psfsrc, int delta);
 150
 151 static void ip_ma_put(struct ip_mc_list *im)
 152 {
 153         if (atomic_dec_and_test(&im->refcnt)) {
 154                 in_dev_put(im->interface);
 155                 kfree(im);
 156         }
 157 }
 158
 159 #ifdef CONFIG_IP_MULTICAST
 160
 161 /*
 162  *      Timer management
 163  */
 164
 165 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 166 {
 167         spin_lock_bh(&im->lock);
 168         if (del_timer(&im->timer))
 169                 atomic_dec(&im->refcnt);
 170         im->tm_running=0;
 171         im->reporter = 0;
 172         im->unsolicit_count = 0;
 173         spin_unlock_bh(&im->lock);
 174 }
 175
 176 /* It must be called with locked im->lock */
 177 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 178 {
 179         int tv=net_random() % max_delay;
 180
 181         im->tm_running=1;
 182         if (!mod_timer(&im->timer, jiffies+tv+2))
 183                 atomic_inc(&im->refcnt);
 184 }
 185
 186 static void igmp_gq_start_timer(struct in_device *in_dev)
 187 {
 188         int tv = net_random() % in_dev->mr_maxdelay;
 189
 190         in_dev->mr_gq_running = 1;
 191         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 192                 in_dev_hold(in_dev);
 193 }
 194
 195 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 196 {
 197         int tv = net_random() % delay;
 198
 199         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 200                 in_dev_hold(in_dev);
 201 }
 202
 203 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 204 {
 205         spin_lock_bh(&im->lock);
 206         im->unsolicit_count = 0;
 207         if (del_timer(&im->timer)) {
 208                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 209                         add_timer(&im->timer);
 210                         im->tm_running=1;
 211                         spin_unlock_bh(&im->lock);
 212                         return;
 213                 }
 214                 atomic_dec(&im->refcnt);
 215         }
 216         igmp_start_timer(im, max_delay);
 217         spin_unlock_bh(&im->lock);
 218 }
 219
 220
 221 /*
 222  *      Send an IGMP report.
 223  */
 224
 225 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 226
 227
 228 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 229         int gdeleted, int sdeleted)
 230 {
 231         switch (type) {
 232         case IGMPV3_MODE_IS_INCLUDE:
 233         case IGMPV3_MODE_IS_EXCLUDE:
 234                 if (gdeleted || sdeleted)
 235                         return 0;
 236                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 237                         if (pmc->sfmode == MCAST_INCLUDE)
 238                                 return 1;
 239                         /* don't include if this source is excluded
 240                          * in all filters
 241                          */
 242                         if (psf->sf_count[MCAST_INCLUDE])
 243                                 return type == IGMPV3_MODE_IS_INCLUDE;
 244                         return pmc->sfcount[MCAST_EXCLUDE] ==
 245                                 psf->sf_count[MCAST_EXCLUDE];
 246                 }
 247                 return 0;
 248         case IGMPV3_CHANGE_TO_INCLUDE:
 249                 if (gdeleted || sdeleted)
 250                         return 0;
 251                 return psf->sf_count[MCAST_INCLUDE] != 0;
 252         case IGMPV3_CHANGE_TO_EXCLUDE:
 253                 if (gdeleted || sdeleted)
 254                         return 0;
 255                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 256                     psf->sf_count[MCAST_INCLUDE])
 257                         return 0;
 258                 return pmc->sfcount[MCAST_EXCLUDE] ==
 259                         psf->sf_count[MCAST_EXCLUDE];
 260         case IGMPV3_ALLOW_NEW_SOURCES:
 261                 if (gdeleted || !psf->sf_crcount)
 262                         return 0;
 263                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 264         case IGMPV3_BLOCK_OLD_SOURCES:
 265                 if (pmc->sfmode == MCAST_INCLUDE)
 266                         return gdeleted || (psf->sf_crcount && sdeleted);
 267                 return psf->sf_crcount && !gdeleted && !sdeleted;
 268         }
 269         return 0;
 270 }
 271
 272 static int
 273 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 274 {
 275         struct ip_sf_list *psf;
 276         int scount = 0;
 277
 278         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 279                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 280                         continue;
 281                 scount++;
 282         }
 283         return scount;
 284 }
 285
 286 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 287 {
 288         struct sk_buff *skb;
 289         struct rtable *rt;
 290         struct iphdr *pip;
 291         struct igmpv3_report *pig;
 292         struct net *net = dev_net(dev);
 293
 294         skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 295         if (skb == NULL)
 296                 return NULL;
 297
 298         {
 299                 struct flowi fl = { .oif = dev->ifindex,
 300                                     .nl_u = { .ip4_u = {
 301                                     .daddr = IGMPV3_ALL_MCR } },
 302                                     .proto = IPPROTO_IGMP };
 303                 if (ip_route_output_key(net, &rt, &fl)) {
 304                         kfree_skb(skb);
 305                         return NULL;
 306                 }
 307         }
 308         if (rt->rt_src == 0) {
 309                 kfree_skb(skb);
 310                 ip_rt_put(rt);
 311                 return NULL;
 312         }
 313
 314         skb->dst = &rt->u.dst;
 315         skb->dev = dev;
 316
 317         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 318
 319         skb_reset_network_header(skb);
 320         pip = ip_hdr(skb);
 321         skb_put(skb, sizeof(struct iphdr) + 4);
 322
 323         pip->version  = 4;
 324         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 325         pip->tos      = 0xc0;
 326         pip->frag_off = htons(IP_DF);
 327         pip->ttl      = 1;
 328         pip->daddr    = rt->rt_dst;
 329         pip->saddr    = rt->rt_src;
 330         pip->protocol = IPPROTO_IGMP;
 331         pip->tot_len  = 0;      /* filled in later */
 332         ip_select_ident(pip, &rt->u.dst, NULL);
 333         ((u8*)&pip[1])[0] = IPOPT_RA;
 334         ((u8*)&pip[1])[1] = 4;
 335         ((u8*)&pip[1])[2] = 0;
 336         ((u8*)&pip[1])[3] = 0;
 337
 338         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 339         skb_put(skb, sizeof(*pig));
 340         pig = igmpv3_report_hdr(skb);
 341         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 342         pig->resv1 = 0;
 343         pig->csum = 0;
 344         pig->resv2 = 0;
 345         pig->ngrec = 0;
 346         return skb;
 347 }
 348
 349 static int igmpv3_sendpack(struct sk_buff *skb)
 350 {
 351         struct igmphdr *pig = igmp_hdr(skb);
 352         const int igmplen = skb->tail - skb->transport_header;
 353
 354         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 355
 356         return ip_local_out(skb);
 357 }
 358
 359 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 360 {
 361         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
 362 }
 363
 364 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 365         int type, struct igmpv3_grec **ppgr)
 366 {
 367         struct net_device *dev = pmc->interface->dev;
 368         struct igmpv3_report *pih;
 369         struct igmpv3_grec *pgr;
 370
 371         if (!skb)
 372                 skb = igmpv3_newpack(dev, dev->mtu);
 373         if (!skb)
 374                 return NULL;
 375         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 376         pgr->grec_type = type;
 377         pgr->grec_auxwords = 0;
 378         pgr->grec_nsrcs = 0;
 379         pgr->grec_mca = pmc->multiaddr;
 380         pih = igmpv3_report_hdr(skb);
 381         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 382         *ppgr = pgr;
 383         return skb;
 384 }
 385
 386 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 387         skb_tailroom(skb)) : 0)
 388
 389 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 390         int type, int gdeleted, int sdeleted)
 391 {
 392         struct net_device *dev = pmc->interface->dev;
 393         struct igmpv3_report *pih;
 394         struct igmpv3_grec *pgr = NULL;
 395         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 396         int scount, stotal, first, isquery, truncate;
 397
 398         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 399                 return skb;
 400
 401         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 402                   type == IGMPV3_MODE_IS_EXCLUDE;
 403         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 404                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 405
 406         stotal = scount = 0;
 407
 408         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 409
 410         if (!*psf_list)
 411                 goto empty_source;
 412
 413         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 414
 415         /* EX and TO_EX get a fresh packet, if needed */
 416         if (truncate) {
 417                 if (pih && pih->ngrec &&
 418                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 419                         if (skb)
 420                                 igmpv3_sendpack(skb);
 421                         skb = igmpv3_newpack(dev, dev->mtu);
 422                 }
 423         }
 424         first = 1;
 425         psf_prev = NULL;
 426         for (psf=*psf_list; psf; psf=psf_next) {
 427                 __be32 *psrc;
 428
 429                 psf_next = psf->sf_next;
 430
 431                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 432                         psf_prev = psf;
 433                         continue;
 434                 }
 435
 436                 /* clear marks on query responses */
 437                 if (isquery)
 438                         psf->sf_gsresp = 0;
 439
 440                 if (AVAILABLE(skb) < sizeof(__be32) +
 441                     first*sizeof(struct igmpv3_grec)) {
 442                         if (truncate && !first)
 443                                 break;   /* truncate these */
 444                         if (pgr)
 445                                 pgr->grec_nsrcs = htons(scount);
 446                         if (skb)
 447                                 igmpv3_sendpack(skb);
 448                         skb = igmpv3_newpack(dev, dev->mtu);
 449                         first = 1;
 450                         scount = 0;
 451                 }
 452                 if (first) {
 453                         skb = add_grhead(skb, pmc, type, &pgr);
 454                         first = 0;
 455                 }
 456                 if (!skb)
 457                         return NULL;
 458                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 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         struct net *net = dev_net(dev);
 634         __be32  group = pmc ? pmc->multiaddr : 0;
 635         __be32  dst;
 636
 637         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 638                 return igmpv3_send_report(in_dev, pmc);
 639         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 640                 dst = IGMP_ALL_ROUTER;
 641         else
 642                 dst = group;
 643
 644         {
 645                 struct flowi fl = { .oif = dev->ifindex,
 646                                     .nl_u = { .ip4_u = { .daddr = dst } },
 647                                     .proto = IPPROTO_IGMP };
 648                 if (ip_route_output_key(net, &rt, &fl))
 649                         return -1;
 650         }
 651         if (rt->rt_src == 0) {
 652                 ip_rt_put(rt);
 653                 return -1;
 654         }
 655
 656         skb=alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 657         if (skb == NULL) {
 658                 ip_rt_put(rt);
 659                 return -1;
 660         }
 661
 662         skb->dst = &rt->u.dst;
 663
 664         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 665
 666         skb_reset_network_header(skb);
 667         iph = ip_hdr(skb);
 668         skb_put(skb, sizeof(struct iphdr) + 4);
 669
 670         iph->version  = 4;
 671         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 672         iph->tos      = 0xc0;
 673         iph->frag_off = htons(IP_DF);
 674         iph->ttl      = 1;
 675         iph->daddr    = dst;
 676         iph->saddr    = rt->rt_src;
 677         iph->protocol = IPPROTO_IGMP;
 678         ip_select_ident(iph, &rt->u.dst, NULL);
 679         ((u8*)&iph[1])[0] = IPOPT_RA;
 680         ((u8*)&iph[1])[1] = 4;
 681         ((u8*)&iph[1])[2] = 0;
 682         ((u8*)&iph[1])[3] = 0;
 683
 684         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 685         ih->type=type;
 686         ih->code=0;
 687         ih->csum=0;
 688         ih->group=group;
 689         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 690
 691         return ip_local_out(skb);
 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, __be32 *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, __be32 *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, __be32 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 = igmp_hdr(skb);
 829         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 830         struct ip_mc_list       *im;
 831         __be32                  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 = igmpv3_query_hdr(skb);
 863                 if (ih3->nsrcs) {
 864                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 865                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 866                                 return;
 867                         ih3 = igmpv3_query_hdr(skb);
 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                 goto drop;
 927
 928         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 929                 goto drop_ref;
 930
 931         switch (skb->ip_summed) {
 932         case CHECKSUM_COMPLETE:
 933                 if (!csum_fold(skb->csum))
 934                         break;
 935                 /* fall through */
 936         case CHECKSUM_NONE:
 937                 skb->csum = 0;
 938                 if (__skb_checksum_complete(skb))
 939                         goto drop_ref;
 940         }
 941
 942         ih = igmp_hdr(skb);
 943         switch (ih->type) {
 944         case IGMP_HOST_MEMBERSHIP_QUERY:
 945                 igmp_heard_query(in_dev, skb, len);
 946                 break;
 947         case IGMP_HOST_MEMBERSHIP_REPORT:
 948         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 949         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 950                 /* Is it our report looped back? */
 951                 if (skb->rtable->fl.iif == 0)
 952                         break;
 953                 /* don't rely on MC router hearing unicast reports */
 954                 if (skb->pkt_type == PACKET_MULTICAST ||
 955                     skb->pkt_type == PACKET_BROADCAST)
 956                         igmp_heard_report(in_dev, ih->group);
 957                 break;
 958         case IGMP_PIM:
 959 #ifdef CONFIG_IP_PIMSM_V1
 960                 in_dev_put(in_dev);
 961                 return pim_rcv_v1(skb);
 962 #endif
 963         case IGMP_DVMRP:
 964         case IGMP_TRACE:
 965         case IGMP_HOST_LEAVE_MESSAGE:
 966         case IGMP_MTRACE:
 967         case IGMP_MTRACE_RESP:
 968                 break;
 969         default:
 970                 break;
 971         }
 972
 973 drop_ref:
 974         in_dev_put(in_dev);
 975 drop:
 976         kfree_skb(skb);
 977         return 0;
 978 }
 979
 980 #endif
 981
 982
 983 /*
 984  *      Add a filter to a device
 985  */
 986
 987 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 988 {
 989         char buf[MAX_ADDR_LEN];
 990         struct net_device *dev = in_dev->dev;
 991
 992         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 993            We will get multicast token leakage, when IFF_MULTICAST
 994            is changed. This check should be done in dev->set_multicast_list
 995            routine. Something sort of:
 996            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 997            --ANK
 998            */
 999         if (arp_mc_map(addr, buf, dev, 0) == 0)
1000                 dev_mc_add(dev,buf,dev->addr_len,0);
1001 }
1002
1003 /*
1004  *      Remove a filter from a device
1005  */
1006
1007 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1008 {
1009         char buf[MAX_ADDR_LEN];
1010         struct net_device *dev = in_dev->dev;
1011
1012         if (arp_mc_map(addr, buf, dev, 0) == 0)
1013                 dev_mc_delete(dev,buf,dev->addr_len,0);
1014 }
1015
1016 #ifdef CONFIG_IP_MULTICAST
1017 /*
1018  * deleted ip_mc_list manipulation
1019  */
1020 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1021 {
1022         struct ip_mc_list *pmc;
1023
1024         /* this is an "ip_mc_list" for convenience; only the fields below
1025          * are actually used. In particular, the refcnt and users are not
1026          * used for management of the delete list. Using the same structure
1027          * for deleted items allows change reports to use common code with
1028          * non-deleted or query-response MCA's.
1029          */
1030         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1031         if (!pmc)
1032                 return;
1033         spin_lock_bh(&im->lock);
1034         pmc->interface = im->interface;
1035         in_dev_hold(in_dev);
1036         pmc->multiaddr = im->multiaddr;
1037         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1038                 IGMP_Unsolicited_Report_Count;
1039         pmc->sfmode = im->sfmode;
1040         if (pmc->sfmode == MCAST_INCLUDE) {
1041                 struct ip_sf_list *psf;
1042
1043                 pmc->tomb = im->tomb;
1044                 pmc->sources = im->sources;
1045                 im->tomb = im->sources = NULL;
1046                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1047                         psf->sf_crcount = pmc->crcount;
1048         }
1049         spin_unlock_bh(&im->lock);
1050
1051         spin_lock_bh(&in_dev->mc_tomb_lock);
1052         pmc->next = in_dev->mc_tomb;
1053         in_dev->mc_tomb = pmc;
1054         spin_unlock_bh(&in_dev->mc_tomb_lock);
1055 }
1056
1057 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1058 {
1059         struct ip_mc_list *pmc, *pmc_prev;
1060         struct ip_sf_list *psf, *psf_next;
1061
1062         spin_lock_bh(&in_dev->mc_tomb_lock);
1063         pmc_prev = NULL;
1064         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1065                 if (pmc->multiaddr == multiaddr)
1066                         break;
1067                 pmc_prev = pmc;
1068         }
1069         if (pmc) {
1070                 if (pmc_prev)
1071                         pmc_prev->next = pmc->next;
1072                 else
1073                         in_dev->mc_tomb = pmc->next;
1074         }
1075         spin_unlock_bh(&in_dev->mc_tomb_lock);
1076         if (pmc) {
1077                 for (psf=pmc->tomb; psf; psf=psf_next) {
1078                         psf_next = psf->sf_next;
1079                         kfree(psf);
1080                 }
1081                 in_dev_put(pmc->interface);
1082                 kfree(pmc);
1083         }
1084 }
1085
1086 static void igmpv3_clear_delrec(struct in_device *in_dev)
1087 {
1088         struct ip_mc_list *pmc, *nextpmc;
1089
1090         spin_lock_bh(&in_dev->mc_tomb_lock);
1091         pmc = in_dev->mc_tomb;
1092         in_dev->mc_tomb = NULL;
1093         spin_unlock_bh(&in_dev->mc_tomb_lock);
1094
1095         for (; pmc; pmc = nextpmc) {
1096                 nextpmc = pmc->next;
1097                 ip_mc_clear_src(pmc);
1098                 in_dev_put(pmc->interface);
1099                 kfree(pmc);
1100         }
1101         /* clear dead sources, too */
1102         read_lock(&in_dev->mc_list_lock);
1103         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1104                 struct ip_sf_list *psf, *psf_next;
1105
1106                 spin_lock_bh(&pmc->lock);
1107                 psf = pmc->tomb;
1108                 pmc->tomb = NULL;
1109                 spin_unlock_bh(&pmc->lock);
1110                 for (; psf; psf=psf_next) {
1111                         psf_next = psf->sf_next;
1112                         kfree(psf);
1113                 }
1114         }
1115         read_unlock(&in_dev->mc_list_lock);
1116 }
1117 #endif
1118
1119 static void igmp_group_dropped(struct ip_mc_list *im)
1120 {
1121         struct in_device *in_dev = im->interface;
1122 #ifdef CONFIG_IP_MULTICAST
1123         int reporter;
1124 #endif
1125
1126         if (im->loaded) {
1127                 im->loaded = 0;
1128                 ip_mc_filter_del(in_dev, im->multiaddr);
1129         }
1130
1131 #ifdef CONFIG_IP_MULTICAST
1132         if (im->multiaddr == IGMP_ALL_HOSTS)
1133                 return;
1134
1135         reporter = im->reporter;
1136         igmp_stop_timer(im);
1137
1138         if (!in_dev->dead) {
1139                 if (IGMP_V1_SEEN(in_dev))
1140                         goto done;
1141                 if (IGMP_V2_SEEN(in_dev)) {
1142                         if (reporter)
1143                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1144                         goto done;
1145                 }
1146                 /* IGMPv3 */
1147                 igmpv3_add_delrec(in_dev, im);
1148
1149                 igmp_ifc_event(in_dev);
1150         }
1151 done:
1152 #endif
1153         ip_mc_clear_src(im);
1154 }
1155
1156 static void igmp_group_added(struct ip_mc_list *im)
1157 {
1158         struct in_device *in_dev = im->interface;
1159
1160         if (im->loaded == 0) {
1161                 im->loaded = 1;
1162                 ip_mc_filter_add(in_dev, im->multiaddr);
1163         }
1164
1165 #ifdef CONFIG_IP_MULTICAST
1166         if (im->multiaddr == IGMP_ALL_HOSTS)
1167                 return;
1168
1169         if (in_dev->dead)
1170                 return;
1171         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1172                 spin_lock_bh(&im->lock);
1173                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1174                 spin_unlock_bh(&im->lock);
1175                 return;
1176         }
1177         /* else, v3 */
1178
1179         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1180                 IGMP_Unsolicited_Report_Count;
1181         igmp_ifc_event(in_dev);
1182 #endif
1183 }
1184
1185
1186 /*
1187  *      Multicast list managers
1188  */
1189
1190
1191 /*
1192  *      A socket has joined a multicast group on device dev.
1193  */
1194
1195 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1196 {
1197         struct ip_mc_list *im;
1198
1199         ASSERT_RTNL();
1200
1201         for (im=in_dev->mc_list; im; im=im->next) {
1202                 if (im->multiaddr == addr) {
1203                         im->users++;
1204                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1205                         goto out;
1206                 }
1207         }
1208
1209         im = kmalloc(sizeof(*im), GFP_KERNEL);
1210         if (!im)
1211                 goto out;
1212
1213         im->users=1;
1214         im->interface=in_dev;
1215         in_dev_hold(in_dev);
1216         im->multiaddr=addr;
1217         /* initial mode is (EX, empty) */
1218         im->sfmode = MCAST_EXCLUDE;
1219         im->sfcount[MCAST_INCLUDE] = 0;
1220         im->sfcount[MCAST_EXCLUDE] = 1;
1221         im->sources = NULL;
1222         im->tomb = NULL;
1223         im->crcount = 0;
1224         atomic_set(&im->refcnt, 1);
1225         spin_lock_init(&im->lock);
1226 #ifdef CONFIG_IP_MULTICAST
1227         im->tm_running=0;
1228         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1229         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1230         im->reporter = 0;
1231         im->gsquery = 0;
1232 #endif
1233         im->loaded = 0;
1234         write_lock_bh(&in_dev->mc_list_lock);
1235         im->next=in_dev->mc_list;
1236         in_dev->mc_list=im;
1237         write_unlock_bh(&in_dev->mc_list_lock);
1238 #ifdef CONFIG_IP_MULTICAST
1239         igmpv3_del_delrec(in_dev, im->multiaddr);
1240 #endif
1241         igmp_group_added(im);
1242         if (!in_dev->dead)
1243                 ip_rt_multicast_event(in_dev);
1244 out:
1245         return;
1246 }
1247
1248 /*
1249  *      Resend IGMP JOIN report; used for bonding.
1250  */
1251 void ip_mc_rejoin_group(struct ip_mc_list *im)
1252 {
1253 #ifdef CONFIG_IP_MULTICAST
1254         struct in_device *in_dev = im->interface;
1255
1256         if (im->multiaddr == IGMP_ALL_HOSTS)
1257                 return;
1258
1259         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1260                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1261                 return;
1262         }
1263         /* else, v3 */
1264         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1265                 IGMP_Unsolicited_Report_Count;
1266         igmp_ifc_event(in_dev);
1267 #endif
1268 }
1269
1270 /*
1271  *      A socket has left a multicast group on device dev
1272  */
1273
1274 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1275 {
1276         struct ip_mc_list *i, **ip;
1277
1278         ASSERT_RTNL();
1279
1280         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1281                 if (i->multiaddr==addr) {
1282                         if (--i->users == 0) {
1283                                 write_lock_bh(&in_dev->mc_list_lock);
1284                                 *ip = i->next;
1285                                 write_unlock_bh(&in_dev->mc_list_lock);
1286                                 igmp_group_dropped(i);
1287
1288                                 if (!in_dev->dead)
1289                                         ip_rt_multicast_event(in_dev);
1290
1291                                 ip_ma_put(i);
1292                                 return;
1293                         }
1294                         break;
1295                 }
1296         }
1297 }
1298
1299 /* Device going down */
1300
1301 void ip_mc_down(struct in_device *in_dev)
1302 {
1303         struct ip_mc_list *i;
1304
1305         ASSERT_RTNL();
1306
1307         for (i=in_dev->mc_list; i; i=i->next)
1308                 igmp_group_dropped(i);
1309
1310 #ifdef CONFIG_IP_MULTICAST
1311         in_dev->mr_ifc_count = 0;
1312         if (del_timer(&in_dev->mr_ifc_timer))
1313                 __in_dev_put(in_dev);
1314         in_dev->mr_gq_running = 0;
1315         if (del_timer(&in_dev->mr_gq_timer))
1316                 __in_dev_put(in_dev);
1317         igmpv3_clear_delrec(in_dev);
1318 #endif
1319
1320         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1321 }
1322
1323 void ip_mc_init_dev(struct in_device *in_dev)
1324 {
1325         ASSERT_RTNL();
1326
1327         in_dev->mc_tomb = NULL;
1328 #ifdef CONFIG_IP_MULTICAST
1329         in_dev->mr_gq_running = 0;
1330         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1331                         (unsigned long)in_dev);
1332         in_dev->mr_ifc_count = 0;
1333         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1334                         (unsigned long)in_dev);
1335         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1336 #endif
1337
1338         rwlock_init(&in_dev->mc_list_lock);
1339         spin_lock_init(&in_dev->mc_tomb_lock);
1340 }
1341
1342 /* Device going up */
1343
1344 void ip_mc_up(struct in_device *in_dev)
1345 {
1346         struct ip_mc_list *i;
1347
1348         ASSERT_RTNL();
1349
1350         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1351
1352         for (i=in_dev->mc_list; i; i=i->next)
1353                 igmp_group_added(i);
1354 }
1355
1356 /*
1357  *      Device is about to be destroyed: clean up.
1358  */
1359
1360 void ip_mc_destroy_dev(struct in_device *in_dev)
1361 {
1362         struct ip_mc_list *i;
1363
1364         ASSERT_RTNL();
1365
1366         /* Deactivate timers */
1367         ip_mc_down(in_dev);
1368
1369         write_lock_bh(&in_dev->mc_list_lock);
1370         while ((i = in_dev->mc_list) != NULL) {
1371                 in_dev->mc_list = i->next;
1372                 write_unlock_bh(&in_dev->mc_list_lock);
1373
1374                 igmp_group_dropped(i);
1375                 ip_ma_put(i);
1376
1377                 write_lock_bh(&in_dev->mc_list_lock);
1378         }
1379         write_unlock_bh(&in_dev->mc_list_lock);
1380 }
1381
1382 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1383 {
1384         struct flowi fl = { .nl_u = { .ip4_u =
1385                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1386         struct rtable *rt;
1387         struct net_device *dev = NULL;
1388         struct in_device *idev = NULL;
1389
1390         if (imr->imr_ifindex) {
1391                 idev = inetdev_by_index(net, imr->imr_ifindex);
1392                 if (idev)
1393                         __in_dev_put(idev);
1394                 return idev;
1395         }
1396         if (imr->imr_address.s_addr) {
1397                 dev = ip_dev_find(net, imr->imr_address.s_addr);
1398                 if (!dev)
1399                         return NULL;
1400                 dev_put(dev);
1401         }
1402
1403         if (!dev && !ip_route_output_key(net, &rt, &fl)) {
1404                 dev = rt->u.dst.dev;
1405                 ip_rt_put(rt);
1406         }
1407         if (dev) {
1408                 imr->imr_ifindex = dev->ifindex;
1409                 idev = __in_dev_get_rtnl(dev);
1410         }
1411         return idev;
1412 }
1413
1414 /*
1415  *      Join a socket to a group
1416  */
1417 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1418 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1419
1420
1421 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1422         __be32 *psfsrc)
1423 {
1424         struct ip_sf_list *psf, *psf_prev;
1425         int rv = 0;
1426
1427         psf_prev = NULL;
1428         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1429                 if (psf->sf_inaddr == *psfsrc)
1430                         break;
1431                 psf_prev = psf;
1432         }
1433         if (!psf || psf->sf_count[sfmode] == 0) {
1434                 /* source filter not found, or count wrong =>  bug */
1435                 return -ESRCH;
1436         }
1437         psf->sf_count[sfmode]--;
1438         if (psf->sf_count[sfmode] == 0) {
1439                 ip_rt_multicast_event(pmc->interface);
1440         }
1441         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1442 #ifdef CONFIG_IP_MULTICAST
1443                 struct in_device *in_dev = pmc->interface;
1444 #endif
1445
1446                 /* no more filters for this source */
1447                 if (psf_prev)
1448                         psf_prev->sf_next = psf->sf_next;
1449                 else
1450                         pmc->sources = psf->sf_next;
1451 #ifdef CONFIG_IP_MULTICAST
1452                 if (psf->sf_oldin &&
1453                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1454                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1455                                 IGMP_Unsolicited_Report_Count;
1456                         psf->sf_next = pmc->tomb;
1457                         pmc->tomb = psf;
1458                         rv = 1;
1459                 } else
1460 #endif
1461                         kfree(psf);
1462         }
1463         return rv;
1464 }
1465
1466 #ifndef CONFIG_IP_MULTICAST
1467 #define igmp_ifc_event(x)       do { } while (0)
1468 #endif
1469
1470 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1471                          int sfcount, __be32 *psfsrc, int delta)
1472 {
1473         struct ip_mc_list *pmc;
1474         int     changerec = 0;
1475         int     i, err;
1476
1477         if (!in_dev)
1478                 return -ENODEV;
1479         read_lock(&in_dev->mc_list_lock);
1480         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1481                 if (*pmca == pmc->multiaddr)
1482                         break;
1483         }
1484         if (!pmc) {
1485                 /* MCA not found?? bug */
1486                 read_unlock(&in_dev->mc_list_lock);
1487                 return -ESRCH;
1488         }
1489         spin_lock_bh(&pmc->lock);
1490         read_unlock(&in_dev->mc_list_lock);
1491 #ifdef CONFIG_IP_MULTICAST
1492         sf_markstate(pmc);
1493 #endif
1494         if (!delta) {
1495                 err = -EINVAL;
1496                 if (!pmc->sfcount[sfmode])
1497                         goto out_unlock;
1498                 pmc->sfcount[sfmode]--;
1499         }
1500         err = 0;
1501         for (i=0; i<sfcount; i++) {
1502                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1503
1504                 changerec |= rv > 0;
1505                 if (!err && rv < 0)
1506                         err = rv;
1507         }
1508         if (pmc->sfmode == MCAST_EXCLUDE &&
1509             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1510             pmc->sfcount[MCAST_INCLUDE]) {
1511 #ifdef CONFIG_IP_MULTICAST
1512                 struct ip_sf_list *psf;
1513 #endif
1514
1515                 /* filter mode change */
1516                 pmc->sfmode = MCAST_INCLUDE;
1517 #ifdef CONFIG_IP_MULTICAST
1518                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1519                         IGMP_Unsolicited_Report_Count;
1520                 in_dev->mr_ifc_count = pmc->crcount;
1521                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1522                         psf->sf_crcount = 0;
1523                 igmp_ifc_event(pmc->interface);
1524         } else if (sf_setstate(pmc) || changerec) {
1525                 igmp_ifc_event(pmc->interface);
1526 #endif
1527         }
1528 out_unlock:
1529         spin_unlock_bh(&pmc->lock);
1530         return err;
1531 }
1532
1533 /*
1534  * Add multicast single-source filter to the interface list
1535  */
1536 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1537         __be32 *psfsrc, int delta)
1538 {
1539         struct ip_sf_list *psf, *psf_prev;
1540
1541         psf_prev = NULL;
1542         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1543                 if (psf->sf_inaddr == *psfsrc)
1544                         break;
1545                 psf_prev = psf;
1546         }
1547         if (!psf) {
1548                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1549                 if (!psf)
1550                         return -ENOBUFS;
1551                 psf->sf_inaddr = *psfsrc;
1552                 if (psf_prev) {
1553                         psf_prev->sf_next = psf;
1554                 } else
1555                         pmc->sources = psf;
1556         }
1557         psf->sf_count[sfmode]++;
1558         if (psf->sf_count[sfmode] == 1) {
1559                 ip_rt_multicast_event(pmc->interface);
1560         }
1561         return 0;
1562 }
1563
1564 #ifdef CONFIG_IP_MULTICAST
1565 static void sf_markstate(struct ip_mc_list *pmc)
1566 {
1567         struct ip_sf_list *psf;
1568         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1569
1570         for (psf=pmc->sources; psf; psf=psf->sf_next)
1571                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1572                         psf->sf_oldin = mca_xcount ==
1573                                 psf->sf_count[MCAST_EXCLUDE] &&
1574                                 !psf->sf_count[MCAST_INCLUDE];
1575                 } else
1576                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1577 }
1578
1579 static int sf_setstate(struct ip_mc_list *pmc)
1580 {
1581         struct ip_sf_list *psf, *dpsf;
1582         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1583         int qrv = pmc->interface->mr_qrv;
1584         int new_in, rv;
1585
1586         rv = 0;
1587         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1588                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1589                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1590                                 !psf->sf_count[MCAST_INCLUDE];
1591                 } else
1592                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1593                 if (new_in) {
1594                         if (!psf->sf_oldin) {
1595                                 struct ip_sf_list *prev = NULL;
1596
1597                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1598                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1599                                                 break;
1600                                         prev = dpsf;
1601                                 }
1602                                 if (dpsf) {
1603                                         if (prev)
1604                                                 prev->sf_next = dpsf->sf_next;
1605                                         else
1606                                                 pmc->tomb = dpsf->sf_next;
1607                                         kfree(dpsf);
1608                                 }
1609                                 psf->sf_crcount = qrv;
1610                                 rv++;
1611                         }
1612                 } else if (psf->sf_oldin) {
1613
1614                         psf->sf_crcount = 0;
1615                         /*
1616                          * add or update "delete" records if an active filter
1617                          * is now inactive
1618                          */
1619                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1620                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1621                                         break;
1622                         if (!dpsf) {
1623                                 dpsf = (struct ip_sf_list *)
1624                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1625                                 if (!dpsf)
1626                                         continue;
1627                                 *dpsf = *psf;
1628                                 /* pmc->lock held by callers */
1629                                 dpsf->sf_next = pmc->tomb;
1630                                 pmc->tomb = dpsf;
1631                         }
1632                         dpsf->sf_crcount = qrv;
1633                         rv++;
1634                 }
1635         }
1636         return rv;
1637 }
1638 #endif
1639
1640 /*
1641  * Add multicast source filter list to the interface list
1642  */
1643 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1644                          int sfcount, __be32 *psfsrc, int delta)
1645 {
1646         struct ip_mc_list *pmc;
1647         int     isexclude;
1648         int     i, err;
1649
1650         if (!in_dev)
1651                 return -ENODEV;
1652         read_lock(&in_dev->mc_list_lock);
1653         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1654                 if (*pmca == pmc->multiaddr)
1655                         break;
1656         }
1657         if (!pmc) {
1658                 /* MCA not found?? bug */
1659                 read_unlock(&in_dev->mc_list_lock);
1660                 return -ESRCH;
1661         }
1662         spin_lock_bh(&pmc->lock);
1663         read_unlock(&in_dev->mc_list_lock);
1664
1665 #ifdef CONFIG_IP_MULTICAST
1666         sf_markstate(pmc);
1667 #endif
1668         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1669         if (!delta)
1670                 pmc->sfcount[sfmode]++;
1671         err = 0;
1672         for (i=0; i<sfcount; i++) {
1673                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1674                 if (err)
1675                         break;
1676         }
1677         if (err) {
1678                 int j;
1679
1680                 pmc->sfcount[sfmode]--;
1681                 for (j=0; j<i; j++)
1682                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1683         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1684 #ifdef CONFIG_IP_MULTICAST
1685                 struct ip_sf_list *psf;
1686                 in_dev = pmc->interface;
1687 #endif
1688
1689                 /* filter mode change */
1690                 if (pmc->sfcount[MCAST_EXCLUDE])
1691                         pmc->sfmode = MCAST_EXCLUDE;
1692                 else if (pmc->sfcount[MCAST_INCLUDE])
1693                         pmc->sfmode = MCAST_INCLUDE;
1694 #ifdef CONFIG_IP_MULTICAST
1695                 /* else no filters; keep old mode for reports */
1696
1697                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1698                         IGMP_Unsolicited_Report_Count;
1699                 in_dev->mr_ifc_count = pmc->crcount;
1700                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1701                         psf->sf_crcount = 0;
1702                 igmp_ifc_event(in_dev);
1703         } else if (sf_setstate(pmc)) {
1704                 igmp_ifc_event(in_dev);
1705 #endif
1706         }
1707         spin_unlock_bh(&pmc->lock);
1708         return err;
1709 }
1710
1711 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1712 {
1713         struct ip_sf_list *psf, *nextpsf;
1714
1715         for (psf=pmc->tomb; psf; psf=nextpsf) {
1716                 nextpsf = psf->sf_next;
1717                 kfree(psf);
1718         }
1719         pmc->tomb = NULL;
1720         for (psf=pmc->sources; psf; psf=nextpsf) {
1721                 nextpsf = psf->sf_next;
1722                 kfree(psf);
1723         }
1724         pmc->sources = NULL;
1725         pmc->sfmode = MCAST_EXCLUDE;
1726         pmc->sfcount[MCAST_INCLUDE] = 0;
1727         pmc->sfcount[MCAST_EXCLUDE] = 1;
1728 }
1729
1730
1731 /*
1732  * Join a multicast group
1733  */
1734 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1735 {
1736         int err;
1737         __be32 addr = imr->imr_multiaddr.s_addr;
1738         struct ip_mc_socklist *iml=NULL, *i;
1739         struct in_device *in_dev;
1740         struct inet_sock *inet = inet_sk(sk);
1741         struct net *net = sock_net(sk);
1742         int ifindex;
1743         int count = 0;
1744
1745         if (!ipv4_is_multicast(addr))
1746                 return -EINVAL;
1747
1748         rtnl_lock();
1749
1750         in_dev = ip_mc_find_dev(net, imr);
1751
1752         if (!in_dev) {
1753                 iml = NULL;
1754                 err = -ENODEV;
1755                 goto done;
1756         }
1757
1758         err = -EADDRINUSE;
1759         ifindex = imr->imr_ifindex;
1760         for (i = inet->mc_list; i; i = i->next) {
1761                 if (i->multi.imr_multiaddr.s_addr == addr &&
1762                     i->multi.imr_ifindex == ifindex)
1763                         goto done;
1764                 count++;
1765         }
1766         err = -ENOBUFS;
1767         if (count >= sysctl_igmp_max_memberships)
1768                 goto done;
1769         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1770         if (iml == NULL)
1771                 goto done;
1772
1773         memcpy(&iml->multi, imr, sizeof(*imr));
1774         iml->next = inet->mc_list;
1775         iml->sflist = NULL;
1776         iml->sfmode = MCAST_EXCLUDE;
1777         inet->mc_list = iml;
1778         ip_mc_inc_group(in_dev, addr);
1779         err = 0;
1780 done:
1781         rtnl_unlock();
1782         return err;
1783 }
1784
1785 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1786                            struct in_device *in_dev)
1787 {
1788         int err;
1789
1790         if (iml->sflist == NULL) {
1791                 /* any-source empty exclude case */
1792                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1793                         iml->sfmode, 0, NULL, 0);
1794         }
1795         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1796                         iml->sfmode, iml->sflist->sl_count,
1797                         iml->sflist->sl_addr, 0);
1798         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1799         iml->sflist = NULL;
1800         return err;
1801 }
1802
1803 /*
1804  *      Ask a socket to leave a group.
1805  */
1806
1807 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1808 {
1809         struct inet_sock *inet = inet_sk(sk);
1810         struct ip_mc_socklist *iml, **imlp;
1811         struct in_device *in_dev;
1812         struct net *net = sock_net(sk);
1813         __be32 group = imr->imr_multiaddr.s_addr;
1814         u32 ifindex;
1815         int ret = -EADDRNOTAVAIL;
1816
1817         rtnl_lock();
1818         in_dev = ip_mc_find_dev(net, imr);
1819         ifindex = imr->imr_ifindex;
1820         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1821                 if (iml->multi.imr_multiaddr.s_addr != group)
1822                         continue;
1823                 if (ifindex) {
1824                         if (iml->multi.imr_ifindex != ifindex)
1825                                 continue;
1826                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1827                                 iml->multi.imr_address.s_addr)
1828                         continue;
1829
1830                 (void) ip_mc_leave_src(sk, iml, in_dev);
1831
1832                 *imlp = iml->next;
1833
1834                 if (in_dev)
1835                         ip_mc_dec_group(in_dev, group);
1836                 rtnl_unlock();
1837                 sock_kfree_s(sk, iml, sizeof(*iml));
1838                 return 0;
1839         }
1840         if (!in_dev)
1841                 ret = -ENODEV;
1842         rtnl_unlock();
1843         return ret;
1844 }
1845
1846 int ip_mc_source(int add, int omode, struct sock *sk, struct
1847         ip_mreq_source *mreqs, int ifindex)
1848 {
1849         int err;
1850         struct ip_mreqn imr;
1851         __be32 addr = mreqs->imr_multiaddr;
1852         struct ip_mc_socklist *pmc;
1853         struct in_device *in_dev = NULL;
1854         struct inet_sock *inet = inet_sk(sk);
1855         struct ip_sf_socklist *psl;
1856         struct net *net = sock_net(sk);
1857         int leavegroup = 0;
1858         int i, j, rv;
1859
1860         if (!ipv4_is_multicast(addr))
1861                 return -EINVAL;
1862
1863         rtnl_lock();
1864
1865         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1866         imr.imr_address.s_addr = mreqs->imr_interface;
1867         imr.imr_ifindex = ifindex;
1868         in_dev = ip_mc_find_dev(net, &imr);
1869
1870         if (!in_dev) {
1871                 err = -ENODEV;
1872                 goto done;
1873         }
1874         err = -EADDRNOTAVAIL;
1875
1876         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1877                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1878                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1879                         break;
1880         }
1881         if (!pmc) {             /* must have a prior join */
1882                 err = -EINVAL;
1883                 goto done;
1884         }
1885         /* if a source filter was set, must be the same mode as before */
1886         if (pmc->sflist) {
1887                 if (pmc->sfmode != omode) {
1888                         err = -EINVAL;
1889                         goto done;
1890                 }
1891         } else if (pmc->sfmode != omode) {
1892                 /* allow mode switches for empty-set filters */
1893                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1894                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1895                         NULL, 0);
1896                 pmc->sfmode = omode;
1897         }
1898
1899         psl = pmc->sflist;
1900         if (!add) {
1901                 if (!psl)
1902                         goto done;      /* err = -EADDRNOTAVAIL */
1903                 rv = !0;
1904                 for (i=0; i<psl->sl_count; i++) {
1905                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1906                                 sizeof(__be32));
1907                         if (rv == 0)
1908                                 break;
1909                 }
1910                 if (rv)         /* source not found */
1911                         goto done;      /* err = -EADDRNOTAVAIL */
1912
1913                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1914                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1915                         leavegroup = 1;
1916                         goto done;
1917                 }
1918
1919                 /* update the interface filter */
1920                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1921                         &mreqs->imr_sourceaddr, 1);
1922
1923                 for (j=i+1; j<psl->sl_count; j++)
1924                         psl->sl_addr[j-1] = psl->sl_addr[j];
1925                 psl->sl_count--;
1926                 err = 0;
1927                 goto done;
1928         }
1929         /* else, add a new source to the filter */
1930
1931         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1932                 err = -ENOBUFS;
1933                 goto done;
1934         }
1935         if (!psl || psl->sl_count == psl->sl_max) {
1936                 struct ip_sf_socklist *newpsl;
1937                 int count = IP_SFBLOCK;
1938
1939                 if (psl)
1940                         count += psl->sl_max;
1941                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1942                 if (!newpsl) {
1943                         err = -ENOBUFS;
1944                         goto done;
1945                 }
1946                 newpsl->sl_max = count;
1947                 newpsl->sl_count = count - IP_SFBLOCK;
1948                 if (psl) {
1949                         for (i=0; i<psl->sl_count; i++)
1950                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1951                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1952                 }
1953                 pmc->sflist = psl = newpsl;
1954         }
1955         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1956         for (i=0; i<psl->sl_count; i++) {
1957                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1958                         sizeof(__be32));
1959                 if (rv == 0)
1960                         break;
1961         }
1962         if (rv == 0)            /* address already there is an error */
1963                 goto done;
1964         for (j=psl->sl_count-1; j>=i; j--)
1965                 psl->sl_addr[j+1] = psl->sl_addr[j];
1966         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1967         psl->sl_count++;
1968         err = 0;
1969         /* update the interface list */
1970         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1971                 &mreqs->imr_sourceaddr, 1);
1972 done:
1973         rtnl_unlock();
1974         if (leavegroup)
1975                 return ip_mc_leave_group(sk, &imr);
1976         return err;
1977 }
1978
1979 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1980 {
1981         int err = 0;
1982         struct ip_mreqn imr;
1983         __be32 addr = msf->imsf_multiaddr;
1984         struct ip_mc_socklist *pmc;
1985         struct in_device *in_dev;
1986         struct inet_sock *inet = inet_sk(sk);
1987         struct ip_sf_socklist *newpsl, *psl;
1988         struct net *net = sock_net(sk);
1989         int leavegroup = 0;
1990
1991         if (!ipv4_is_multicast(addr))
1992                 return -EINVAL;
1993         if (msf->imsf_fmode != MCAST_INCLUDE &&
1994             msf->imsf_fmode != MCAST_EXCLUDE)
1995                 return -EINVAL;
1996
1997         rtnl_lock();
1998
1999         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2000         imr.imr_address.s_addr = msf->imsf_interface;
2001         imr.imr_ifindex = ifindex;
2002         in_dev = ip_mc_find_dev(net, &imr);
2003
2004         if (!in_dev) {
2005                 err = -ENODEV;
2006                 goto done;
2007         }
2008
2009         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2010         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2011                 leavegroup = 1;
2012                 goto done;
2013         }
2014
2015         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2016                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2017                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2018                         break;
2019         }
2020         if (!pmc) {             /* must have a prior join */
2021                 err = -EINVAL;
2022                 goto done;
2023         }
2024         if (msf->imsf_numsrc) {
2025                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2026                                                            GFP_KERNEL);
2027                 if (!newpsl) {
2028                         err = -ENOBUFS;
2029                         goto done;
2030                 }
2031                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2032                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2033                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2034                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2035                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2036                 if (err) {
2037                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2038                         goto done;
2039                 }
2040         } else {
2041                 newpsl = NULL;
2042                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2043                                      msf->imsf_fmode, 0, NULL, 0);
2044         }
2045         psl = pmc->sflist;
2046         if (psl) {
2047                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2048                         psl->sl_count, psl->sl_addr, 0);
2049                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2050         } else
2051                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2052                         0, NULL, 0);
2053         pmc->sflist = newpsl;
2054         pmc->sfmode = msf->imsf_fmode;
2055         err = 0;
2056 done:
2057         rtnl_unlock();
2058         if (leavegroup)
2059                 err = ip_mc_leave_group(sk, &imr);
2060         return err;
2061 }
2062
2063 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2064         struct ip_msfilter __user *optval, int __user *optlen)
2065 {
2066         int err, len, count, copycount;
2067         struct ip_mreqn imr;
2068         __be32 addr = msf->imsf_multiaddr;
2069         struct ip_mc_socklist *pmc;
2070         struct in_device *in_dev;
2071         struct inet_sock *inet = inet_sk(sk);
2072         struct ip_sf_socklist *psl;
2073         struct net *net = sock_net(sk);
2074
2075         if (!ipv4_is_multicast(addr))
2076                 return -EINVAL;
2077
2078         rtnl_lock();
2079
2080         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2081         imr.imr_address.s_addr = msf->imsf_interface;
2082         imr.imr_ifindex = 0;
2083         in_dev = ip_mc_find_dev(net, &imr);
2084
2085         if (!in_dev) {
2086                 err = -ENODEV;
2087                 goto done;
2088         }
2089         err = -EADDRNOTAVAIL;
2090
2091         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2092                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2093                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2094                         break;
2095         }
2096         if (!pmc)               /* must have a prior join */
2097                 goto done;
2098         msf->imsf_fmode = pmc->sfmode;
2099         psl = pmc->sflist;
2100         rtnl_unlock();
2101         if (!psl) {
2102                 len = 0;
2103                 count = 0;
2104         } else {
2105                 count = psl->sl_count;
2106         }
2107         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2108         len = copycount * sizeof(psl->sl_addr[0]);
2109         msf->imsf_numsrc = count;
2110         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2111             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2112                 return -EFAULT;
2113         }
2114         if (len &&
2115             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2116                 return -EFAULT;
2117         return 0;
2118 done:
2119         rtnl_unlock();
2120         return err;
2121 }
2122
2123 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2124         struct group_filter __user *optval, int __user *optlen)
2125 {
2126         int err, i, count, copycount;
2127         struct sockaddr_in *psin;
2128         __be32 addr;
2129         struct ip_mc_socklist *pmc;
2130         struct inet_sock *inet = inet_sk(sk);
2131         struct ip_sf_socklist *psl;
2132
2133         psin = (struct sockaddr_in *)&gsf->gf_group;
2134         if (psin->sin_family != AF_INET)
2135                 return -EINVAL;
2136         addr = psin->sin_addr.s_addr;
2137         if (!ipv4_is_multicast(addr))
2138                 return -EINVAL;
2139
2140         rtnl_lock();
2141
2142         err = -EADDRNOTAVAIL;
2143
2144         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2145                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2146                     pmc->multi.imr_ifindex == gsf->gf_interface)
2147                         break;
2148         }
2149         if (!pmc)               /* must have a prior join */
2150                 goto done;
2151         gsf->gf_fmode = pmc->sfmode;
2152         psl = pmc->sflist;
2153         rtnl_unlock();
2154         count = psl ? psl->sl_count : 0;
2155         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2156         gsf->gf_numsrc = count;
2157         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2158             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2159                 return -EFAULT;
2160         }
2161         for (i=0; i<copycount; i++) {
2162                 struct sockaddr_storage ss;
2163
2164                 psin = (struct sockaddr_in *)&ss;
2165                 memset(&ss, 0, sizeof(ss));
2166                 psin->sin_family = AF_INET;
2167                 psin->sin_addr.s_addr = psl->sl_addr[i];
2168                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2169                         return -EFAULT;
2170         }
2171         return 0;
2172 done:
2173         rtnl_unlock();
2174         return err;
2175 }
2176
2177 /*
2178  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2179  */
2180 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2181 {
2182         struct inet_sock *inet = inet_sk(sk);
2183         struct ip_mc_socklist *pmc;
2184         struct ip_sf_socklist *psl;
2185         int i;
2186
2187         if (!ipv4_is_multicast(loc_addr))
2188                 return 1;
2189
2190         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2191                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2192                     pmc->multi.imr_ifindex == dif)
2193                         break;
2194         }
2195         if (!pmc)
2196                 return 1;
2197         psl = pmc->sflist;
2198         if (!psl)
2199                 return pmc->sfmode == MCAST_EXCLUDE;
2200
2201         for (i=0; i<psl->sl_count; i++) {
2202                 if (psl->sl_addr[i] == rmt_addr)
2203                         break;
2204         }
2205         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2206                 return 0;
2207         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2208                 return 0;
2209         return 1;
2210 }
2211
2212 /*
2213  *      A socket is closing.
2214  */
2215
2216 void ip_mc_drop_socket(struct sock *sk)
2217 {
2218         struct inet_sock *inet = inet_sk(sk);
2219         struct ip_mc_socklist *iml;
2220         struct net *net = sock_net(sk);
2221
2222         if (inet->mc_list == NULL)
2223                 return;
2224
2225         rtnl_lock();
2226         while ((iml = inet->mc_list) != NULL) {
2227                 struct in_device *in_dev;
2228                 inet->mc_list = iml->next;
2229
2230                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2231                 (void) ip_mc_leave_src(sk, iml, in_dev);
2232                 if (in_dev != NULL) {
2233                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2234                         in_dev_put(in_dev);
2235                 }
2236                 sock_kfree_s(sk, iml, sizeof(*iml));
2237         }
2238         rtnl_unlock();
2239 }
2240
2241 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2242 {
2243         struct ip_mc_list *im;
2244         struct ip_sf_list *psf;
2245         int rv = 0;
2246
2247         read_lock(&in_dev->mc_list_lock);
2248         for (im=in_dev->mc_list; im; im=im->next) {
2249                 if (im->multiaddr == mc_addr)
2250                         break;
2251         }
2252         if (im && proto == IPPROTO_IGMP) {
2253                 rv = 1;
2254         } else if (im) {
2255                 if (src_addr) {
2256                         for (psf=im->sources; psf; psf=psf->sf_next) {
2257                                 if (psf->sf_inaddr == src_addr)
2258                                         break;
2259                         }
2260                         if (psf)
2261                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2262                                         psf->sf_count[MCAST_EXCLUDE] !=
2263                                         im->sfcount[MCAST_EXCLUDE];
2264                         else
2265                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2266                 } else
2267                         rv = 1; /* unspecified source; tentatively allow */
2268         }
2269         read_unlock(&in_dev->mc_list_lock);
2270         return rv;
2271 }
2272
2273 #if defined(CONFIG_PROC_FS)
2274 struct igmp_mc_iter_state {
2275         struct net_device *dev;
2276         struct in_device *in_dev;
2277 };
2278
2279 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2280
2281 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2282 {
2283         struct ip_mc_list *im = NULL;
2284         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2285
2286         state->in_dev = NULL;
2287         for_each_netdev(&init_net, state->dev) {
2288                 struct in_device *in_dev;
2289                 in_dev = in_dev_get(state->dev);
2290                 if (!in_dev)
2291                         continue;
2292                 read_lock(&in_dev->mc_list_lock);
2293                 im = in_dev->mc_list;
2294                 if (im) {
2295                         state->in_dev = in_dev;
2296                         break;
2297                 }
2298                 read_unlock(&in_dev->mc_list_lock);
2299                 in_dev_put(in_dev);
2300         }
2301         return im;
2302 }
2303
2304 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2305 {
2306         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2307         im = im->next;
2308         while (!im) {
2309                 if (likely(state->in_dev != NULL)) {
2310                         read_unlock(&state->in_dev->mc_list_lock);
2311                         in_dev_put(state->in_dev);
2312                 }
2313                 state->dev = next_net_device(state->dev);
2314                 if (!state->dev) {
2315                         state->in_dev = NULL;
2316                         break;
2317                 }
2318                 state->in_dev = in_dev_get(state->dev);
2319                 if (!state->in_dev)
2320                         continue;
2321                 read_lock(&state->in_dev->mc_list_lock);
2322                 im = state->in_dev->mc_list;
2323         }
2324         return im;
2325 }
2326
2327 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2328 {
2329         struct ip_mc_list *im = igmp_mc_get_first(seq);
2330         if (im)
2331                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2332                         --pos;
2333         return pos ? NULL : im;
2334 }
2335
2336 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2337         __acquires(dev_base_lock)
2338 {
2339         read_lock(&dev_base_lock);
2340         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2341 }
2342
2343 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2344 {
2345         struct ip_mc_list *im;
2346         if (v == SEQ_START_TOKEN)
2347                 im = igmp_mc_get_first(seq);
2348         else
2349                 im = igmp_mc_get_next(seq, v);
2350         ++*pos;
2351         return im;
2352 }
2353
2354 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2355         __releases(dev_base_lock)
2356 {
2357         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2358         if (likely(state->in_dev != NULL)) {
2359                 read_unlock(&state->in_dev->mc_list_lock);
2360                 in_dev_put(state->in_dev);
2361                 state->in_dev = NULL;
2362         }
2363         state->dev = NULL;
2364         read_unlock(&dev_base_lock);
2365 }
2366
2367 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2368 {
2369         if (v == SEQ_START_TOKEN)
2370                 seq_puts(seq,
2371                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2372         else {
2373                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2374                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2375                 char   *querier;
2376 #ifdef CONFIG_IP_MULTICAST
2377                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2378                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2379                           "V3";
2380 #else
2381                 querier = "NONE";
2382 #endif
2383
2384                 if (state->in_dev->mc_list == im) {
2385                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2386                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2387                 }
2388
2389                 seq_printf(seq,
2390                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2391                            im->multiaddr, im->users,
2392                            im->tm_running, im->tm_running ?
2393                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2394                            im->reporter);
2395         }
2396         return 0;
2397 }
2398
2399 static const struct seq_operations igmp_mc_seq_ops = {
2400         .start  =       igmp_mc_seq_start,
2401         .next   =       igmp_mc_seq_next,
2402         .stop   =       igmp_mc_seq_stop,
2403         .show   =       igmp_mc_seq_show,
2404 };
2405
2406 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2407 {
2408         return seq_open_private(file, &igmp_mc_seq_ops,
2409                         sizeof(struct igmp_mc_iter_state));
2410 }
2411
2412 static const struct file_operations igmp_mc_seq_fops = {
2413         .owner          =       THIS_MODULE,
2414         .open           =       igmp_mc_seq_open,
2415         .read           =       seq_read,
2416         .llseek         =       seq_lseek,
2417         .release        =       seq_release_private,
2418 };
2419
2420 struct igmp_mcf_iter_state {
2421         struct net_device *dev;
2422         struct in_device *idev;
2423         struct ip_mc_list *im;
2424 };
2425
2426 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2427
2428 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2429 {
2430         struct ip_sf_list *psf = NULL;
2431         struct ip_mc_list *im = NULL;
2432         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2433
2434         state->idev = NULL;
2435         state->im = NULL;
2436         for_each_netdev(&init_net, state->dev) {
2437                 struct in_device *idev;
2438                 idev = in_dev_get(state->dev);
2439                 if (unlikely(idev == NULL))
2440                         continue;
2441                 read_lock(&idev->mc_list_lock);
2442                 im = idev->mc_list;
2443                 if (likely(im != NULL)) {
2444                         spin_lock_bh(&im->lock);
2445                         psf = im->sources;
2446                         if (likely(psf != NULL)) {
2447                                 state->im = im;
2448                                 state->idev = idev;
2449                                 break;
2450                         }
2451                         spin_unlock_bh(&im->lock);
2452                 }
2453                 read_unlock(&idev->mc_list_lock);
2454                 in_dev_put(idev);
2455         }
2456         return psf;
2457 }
2458
2459 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2460 {
2461         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2462
2463         psf = psf->sf_next;
2464         while (!psf) {
2465                 spin_unlock_bh(&state->im->lock);
2466                 state->im = state->im->next;
2467                 while (!state->im) {
2468                         if (likely(state->idev != NULL)) {
2469                                 read_unlock(&state->idev->mc_list_lock);
2470                                 in_dev_put(state->idev);
2471                         }
2472                         state->dev = next_net_device(state->dev);
2473                         if (!state->dev) {
2474                                 state->idev = NULL;
2475                                 goto out;
2476                         }
2477                         state->idev = in_dev_get(state->dev);
2478                         if (!state->idev)
2479                                 continue;
2480                         read_lock(&state->idev->mc_list_lock);
2481                         state->im = state->idev->mc_list;
2482                 }
2483                 if (!state->im)
2484                         break;
2485                 spin_lock_bh(&state->im->lock);
2486                 psf = state->im->sources;
2487         }
2488 out:
2489         return psf;
2490 }
2491
2492 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2493 {
2494         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2495         if (psf)
2496                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2497                         --pos;
2498         return pos ? NULL : psf;
2499 }
2500
2501 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2502 {
2503         read_lock(&dev_base_lock);
2504         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2505 }
2506
2507 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2508 {
2509         struct ip_sf_list *psf;
2510         if (v == SEQ_START_TOKEN)
2511                 psf = igmp_mcf_get_first(seq);
2512         else
2513                 psf = igmp_mcf_get_next(seq, v);
2514         ++*pos;
2515         return psf;
2516 }
2517
2518 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2519 {
2520         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2521         if (likely(state->im != NULL)) {
2522                 spin_unlock_bh(&state->im->lock);
2523                 state->im = NULL;
2524         }
2525         if (likely(state->idev != NULL)) {
2526                 read_unlock(&state->idev->mc_list_lock);
2527                 in_dev_put(state->idev);
2528                 state->idev = NULL;
2529         }
2530         state->dev = NULL;
2531         read_unlock(&dev_base_lock);
2532 }
2533
2534 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2535 {
2536         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2537         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2538
2539         if (v == SEQ_START_TOKEN) {
2540                 seq_printf(seq,
2541                            "%3s %6s "
2542                            "%10s %10s %6s %6s\n", "Idx",
2543                            "Device", "MCA",
2544                            "SRC", "INC", "EXC");
2545         } else {
2546                 seq_printf(seq,
2547                            "%3d %6.6s 0x%08x "
2548                            "0x%08x %6lu %6lu\n",
2549                            state->dev->ifindex, state->dev->name,
2550                            ntohl(state->im->multiaddr),
2551                            ntohl(psf->sf_inaddr),
2552                            psf->sf_count[MCAST_INCLUDE],
2553                            psf->sf_count[MCAST_EXCLUDE]);
2554         }
2555         return 0;
2556 }
2557
2558 static const struct seq_operations igmp_mcf_seq_ops = {
2559         .start  =       igmp_mcf_seq_start,
2560         .next   =       igmp_mcf_seq_next,
2561         .stop   =       igmp_mcf_seq_stop,
2562         .show   =       igmp_mcf_seq_show,
2563 };
2564
2565 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2566 {
2567         return seq_open_private(file, &igmp_mcf_seq_ops,
2568                         sizeof(struct igmp_mcf_iter_state));
2569 }
2570
2571 static const struct file_operations igmp_mcf_seq_fops = {
2572         .owner          =       THIS_MODULE,
2573         .open           =       igmp_mcf_seq_open,
2574         .read           =       seq_read,
2575         .llseek         =       seq_lseek,
2576         .release        =       seq_release_private,
2577 };
2578
2579 int __init igmp_mc_proc_init(void)
2580 {
2581         proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2582         proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2583         return 0;
2584 }
2585 #endif
2586
2587 EXPORT_SYMBOL(ip_mc_dec_group);
2588 EXPORT_SYMBOL(ip_mc_inc_group);
2589 EXPORT_SYMBOL(ip_mc_join_group);
2590 EXPORT_SYMBOL(ip_mc_rejoin_group);