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   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
  12  *
  13  *      Authors:
  14  *              Alan Cox <Alan.Cox@linux.org>
  15  *
  16  *      This program is free software; you can redistribute it and/or
  17  *      modify it under the terms of the GNU General Public License
  18  *      as published by the Free Software Foundation; either version
  19  *      2 of the License, or (at your option) any later version.
  20  *
  21  *      Fixes:
  22  *
  23  *              Alan Cox        :       Added lots of __inline__ to optimise
  24  *                                      the memory usage of all the tiny little
  25  *                                      functions.
  26  *              Alan Cox        :       Dumped the header building experiment.
  27  *              Alan Cox        :       Minor tweaks ready for multicast routing
  28  *                                      and extended IGMP protocol.
  29  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  30  *                                      writes utterly bogus code otherwise (sigh)
  31  *                                      fixed IGMP loopback to behave in the manner
  32  *                                      desired by mrouted, fixed the fact it has been
  33  *                                      broken since 1.3.6 and cleaned up a few minor
  34  *                                      points.
  35  *
  36  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  37  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  38  *                                      The enhancements are mainly based on Steve Deering's
  39  *                                      ipmulti-3.5 source code.
  40  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  41  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  42  *                                      the mrouted version on that device.
  43  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  44  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  45  *                                      to identify the multicast router version
  46  *                                      and do what the IGMP version 2 specified.
  47  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  48  *              Tsu-Sheng Tsao          if the specified time expired.
  49  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  50  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  51  *              Christian Daudt :       igmp timer wasn't set for local group
  52  *                                      memberships but was being deleted,
  53  *                                      which caused a "del_timer() called
  54  *                                      from %p with timer not initialized\n"
  55  *                                      message (960131).
  56  *              Christian Daudt :       removed del_timer from
  57  *                                      igmp_timer_expire function (960205).
  58  *             Christian Daudt :       igmp_heard_report now only calls
  59  *                                     igmp_timer_expire if tm->running is
  60  *                                     true (960216).
  61  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  62  *                                      igmp_heard_query never trigger. Expiry
  63  *                                      miscalculation fixed in igmp_heard_query
  64  *                                      and random() made to return unsigned to
  65  *                                      prevent negative expiry times.
  66  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  67  *                                      fix from pending 2.1.x patches.
  68  *              Alan Cox:               Forget to enable FDDI support earlier.
  69  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  70  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  71  *              David L Stevens:        IGMPv3 support, with help from
  72  *                                      Vinay Kulkarni
  73  */
  74
  75 #include <linux/module.h>
  76 #include <asm/uaccess.h>
  77 #include <asm/system.h>
  78 #include <linux/types.h>
  79 #include <linux/kernel.h>
  80 #include <linux/jiffies.h>
  81 #include <linux/string.h>
  82 #include <linux/socket.h>
  83 #include <linux/sockios.h>
  84 #include <linux/in.h>
  85 #include <linux/inet.h>
  86 #include <linux/netdevice.h>
  87 #include <linux/skbuff.h>
  88 #include <linux/inetdevice.h>
  89 #include <linux/igmp.h>
  90 #include <linux/if_arp.h>
  91 #include <linux/rtnetlink.h>
  92 #include <linux/times.h>
  93
  94 #include <net/net_namespace.h>
  95 #include <net/arp.h>
  96 #include <net/ip.h>
  97 #include <net/protocol.h>
  98 #include <net/route.h>
  99 #include <net/sock.h>
 100 #include <net/checksum.h>
 101 #include <linux/netfilter_ipv4.h>
 102 #ifdef CONFIG_IP_MROUTE
 103 #include <linux/mroute.h>
 104 #endif
 105 #ifdef CONFIG_PROC_FS
 106 #include <linux/proc_fs.h>
 107 #include <linux/seq_file.h>
 108 #endif
 109
 110 #define IP_MAX_MEMBERSHIPS      20
 111 #define IP_MAX_MSF              10
 112
 113 #ifdef CONFIG_IP_MULTICAST
 114 /* Parameter names and values are taken from igmp-v2-06 draft */
 115
 116 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 117 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 118 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 119 #define IGMP_Query_Response_Interval            (10*HZ)
 120 #define IGMP_Unsolicited_Report_Count           2
 121
 122
 123 #define IGMP_Initial_Report_Delay               (1)
 124
 125 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 126  * IGMP specs require to report membership immediately after
 127  * joining a group, but we delay the first report by a
 128  * small interval. It seems more natural and still does not
 129  * contradict to specs provided this delay is small enough.
 130  */
 131
 132 #define IGMP_V1_SEEN(in_dev) \
 133         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 134          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 135          ((in_dev)->mr_v1_seen && \
 136           time_before(jiffies, (in_dev)->mr_v1_seen)))
 137 #define IGMP_V2_SEEN(in_dev) \
 138         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 139          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 140          ((in_dev)->mr_v2_seen && \
 141           time_before(jiffies, (in_dev)->mr_v2_seen)))
 142
 143 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 144 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 145 static void igmpv3_clear_delrec(struct in_device *in_dev);
 146 static int sf_setstate(struct ip_mc_list *pmc);
 147 static void sf_markstate(struct ip_mc_list *pmc);
 148 #endif
 149 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 150 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 151                          int sfcount, __be32 *psfsrc, int delta);
 152
 153 static void ip_ma_put(struct ip_mc_list *im)
 154 {
 155         if (atomic_dec_and_test(&im->refcnt)) {
 156                 in_dev_put(im->interface);
 157                 kfree(im);
 158         }
 159 }
 160
 161 #ifdef CONFIG_IP_MULTICAST
 162
 163 /*
 164  *      Timer management
 165  */
 166
 167 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 168 {
 169         spin_lock_bh(&im->lock);
 170         if (del_timer(&im->timer))
 171                 atomic_dec(&im->refcnt);
 172         im->tm_running=0;
 173         im->reporter = 0;
 174         im->unsolicit_count = 0;
 175         spin_unlock_bh(&im->lock);
 176 }
 177
 178 /* It must be called with locked im->lock */
 179 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 180 {
 181         int tv=net_random() % max_delay;
 182
 183         im->tm_running=1;
 184         if (!mod_timer(&im->timer, jiffies+tv+2))
 185                 atomic_inc(&im->refcnt);
 186 }
 187
 188 static void igmp_gq_start_timer(struct in_device *in_dev)
 189 {
 190         int tv = net_random() % in_dev->mr_maxdelay;
 191
 192         in_dev->mr_gq_running = 1;
 193         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 194                 in_dev_hold(in_dev);
 195 }
 196
 197 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 198 {
 199         int tv = net_random() % delay;
 200
 201         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 202                 in_dev_hold(in_dev);
 203 }
 204
 205 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 206 {
 207         spin_lock_bh(&im->lock);
 208         im->unsolicit_count = 0;
 209         if (del_timer(&im->timer)) {
 210                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 211                         add_timer(&im->timer);
 212                         im->tm_running=1;
 213                         spin_unlock_bh(&im->lock);
 214                         return;
 215                 }
 216                 atomic_dec(&im->refcnt);
 217         }
 218         igmp_start_timer(im, max_delay);
 219         spin_unlock_bh(&im->lock);
 220 }
 221
 222
 223 /*
 224  *      Send an IGMP report.
 225  */
 226
 227 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 228
 229
 230 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 231         int gdeleted, int sdeleted)
 232 {
 233         switch (type) {
 234         case IGMPV3_MODE_IS_INCLUDE:
 235         case IGMPV3_MODE_IS_EXCLUDE:
 236                 if (gdeleted || sdeleted)
 237                         return 0;
 238                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 239                         if (pmc->sfmode == MCAST_INCLUDE)
 240                                 return 1;
 241                         /* don't include if this source is excluded
 242                          * in all filters
 243                          */
 244                         if (psf->sf_count[MCAST_INCLUDE])
 245                                 return type == IGMPV3_MODE_IS_INCLUDE;
 246                         return pmc->sfcount[MCAST_EXCLUDE] ==
 247                                 psf->sf_count[MCAST_EXCLUDE];
 248                 }
 249                 return 0;
 250         case IGMPV3_CHANGE_TO_INCLUDE:
 251                 if (gdeleted || sdeleted)
 252                         return 0;
 253                 return psf->sf_count[MCAST_INCLUDE] != 0;
 254         case IGMPV3_CHANGE_TO_EXCLUDE:
 255                 if (gdeleted || sdeleted)
 256                         return 0;
 257                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 258                     psf->sf_count[MCAST_INCLUDE])
 259                         return 0;
 260                 return pmc->sfcount[MCAST_EXCLUDE] ==
 261                         psf->sf_count[MCAST_EXCLUDE];
 262         case IGMPV3_ALLOW_NEW_SOURCES:
 263                 if (gdeleted || !psf->sf_crcount)
 264                         return 0;
 265                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 266         case IGMPV3_BLOCK_OLD_SOURCES:
 267                 if (pmc->sfmode == MCAST_INCLUDE)
 268                         return gdeleted || (psf->sf_crcount && sdeleted);
 269                 return psf->sf_crcount && !gdeleted && !sdeleted;
 270         }
 271         return 0;
 272 }
 273
 274 static int
 275 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 276 {
 277         struct ip_sf_list *psf;
 278         int scount = 0;
 279
 280         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 281                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 282                         continue;
 283                 scount++;
 284         }
 285         return scount;
 286 }
 287
 288 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 289 {
 290         struct sk_buff *skb;
 291         struct rtable *rt;
 292         struct iphdr *pip;
 293         struct igmpv3_report *pig;
 294
 295         skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 296         if (skb == NULL)
 297                 return NULL;
 298
 299         {
 300                 struct flowi fl = { .oif = dev->ifindex,
 301                                     .nl_u = { .ip4_u = {
 302                                     .daddr = IGMPV3_ALL_MCR } },
 303                                     .proto = IPPROTO_IGMP };
 304                 if (ip_route_output_key(&init_net, &rt, &fl)) {
 305                         kfree_skb(skb);
 306                         return NULL;
 307                 }
 308         }
 309         if (rt->rt_src == 0) {
 310                 kfree_skb(skb);
 311                 ip_rt_put(rt);
 312                 return NULL;
 313         }
 314
 315         skb->dst = &rt->u.dst;
 316         skb->dev = dev;
 317
 318         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 319
 320         skb_reset_network_header(skb);
 321         pip = ip_hdr(skb);
 322         skb_put(skb, sizeof(struct iphdr) + 4);
 323
 324         pip->version  = 4;
 325         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 326         pip->tos      = 0xc0;
 327         pip->frag_off = htons(IP_DF);
 328         pip->ttl      = 1;
 329         pip->daddr    = rt->rt_dst;
 330         pip->saddr    = rt->rt_src;
 331         pip->protocol = IPPROTO_IGMP;
 332         pip->tot_len  = 0;      /* filled in later */
 333         ip_select_ident(pip, &rt->u.dst, NULL);
 334         ((u8*)&pip[1])[0] = IPOPT_RA;
 335         ((u8*)&pip[1])[1] = 4;
 336         ((u8*)&pip[1])[2] = 0;
 337         ((u8*)&pip[1])[3] = 0;
 338
 339         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 340         skb_put(skb, sizeof(*pig));
 341         pig = igmpv3_report_hdr(skb);
 342         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 343         pig->resv1 = 0;
 344         pig->csum = 0;
 345         pig->resv2 = 0;
 346         pig->ngrec = 0;
 347         return skb;
 348 }
 349
 350 static int igmpv3_sendpack(struct sk_buff *skb)
 351 {
 352         struct igmphdr *pig = igmp_hdr(skb);
 353         const int igmplen = skb->tail - skb->transport_header;
 354
 355         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 356
 357         return ip_local_out(skb);
 358 }
 359
 360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 361 {
 362         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
 363 }
 364
 365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 366         int type, struct igmpv3_grec **ppgr)
 367 {
 368         struct net_device *dev = pmc->interface->dev;
 369         struct igmpv3_report *pih;
 370         struct igmpv3_grec *pgr;
 371
 372         if (!skb)
 373                 skb = igmpv3_newpack(dev, dev->mtu);
 374         if (!skb)
 375                 return NULL;
 376         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 377         pgr->grec_type = type;
 378         pgr->grec_auxwords = 0;
 379         pgr->grec_nsrcs = 0;
 380         pgr->grec_mca = pmc->multiaddr;
 381         pih = igmpv3_report_hdr(skb);
 382         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 383         *ppgr = pgr;
 384         return skb;
 385 }
 386
 387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 388         skb_tailroom(skb)) : 0)
 389
 390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 391         int type, int gdeleted, int sdeleted)
 392 {
 393         struct net_device *dev = pmc->interface->dev;
 394         struct igmpv3_report *pih;
 395         struct igmpv3_grec *pgr = NULL;
 396         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 397         int scount, stotal, first, isquery, truncate;
 398
 399         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 400                 return skb;
 401
 402         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 403                   type == IGMPV3_MODE_IS_EXCLUDE;
 404         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 405                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 406
 407         stotal = scount = 0;
 408
 409         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 410
 411         if (!*psf_list)
 412                 goto empty_source;
 413
 414         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 415
 416         /* EX and TO_EX get a fresh packet, if needed */
 417         if (truncate) {
 418                 if (pih && pih->ngrec &&
 419                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 420                         if (skb)
 421                                 igmpv3_sendpack(skb);
 422                         skb = igmpv3_newpack(dev, dev->mtu);
 423                 }
 424         }
 425         first = 1;
 426         psf_prev = NULL;
 427         for (psf=*psf_list; psf; psf=psf_next) {
 428                 __be32 *psrc;
 429
 430                 psf_next = psf->sf_next;
 431
 432                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 433                         psf_prev = psf;
 434                         continue;
 435                 }
 436
 437                 /* clear marks on query responses */
 438                 if (isquery)
 439                         psf->sf_gsresp = 0;
 440
 441                 if (AVAILABLE(skb) < sizeof(__be32) +
 442                     first*sizeof(struct igmpv3_grec)) {
 443                         if (truncate && !first)
 444                                 break;   /* truncate these */
 445                         if (pgr)
 446                                 pgr->grec_nsrcs = htons(scount);
 447                         if (skb)
 448                                 igmpv3_sendpack(skb);
 449                         skb = igmpv3_newpack(dev, dev->mtu);
 450                         first = 1;
 451                         scount = 0;
 452                 }
 453                 if (first) {
 454                         skb = add_grhead(skb, pmc, type, &pgr);
 455                         first = 0;
 456                 }
 457                 if (!skb)
 458                         return NULL;
 459                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 460                 *psrc = psf->sf_inaddr;
 461                 scount++; stotal++;
 462                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 463                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 464                         psf->sf_crcount--;
 465                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 466                                 if (psf_prev)
 467                                         psf_prev->sf_next = psf->sf_next;
 468                                 else
 469                                         *psf_list = psf->sf_next;
 470                                 kfree(psf);
 471                                 continue;
 472                         }
 473                 }
 474                 psf_prev = psf;
 475         }
 476
 477 empty_source:
 478         if (!stotal) {
 479                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 480                     type == IGMPV3_BLOCK_OLD_SOURCES)
 481                         return skb;
 482                 if (pmc->crcount || isquery) {
 483                         /* make sure we have room for group header */
 484                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 485                                 igmpv3_sendpack(skb);
 486                                 skb = NULL; /* add_grhead will get a new one */
 487                         }
 488                         skb = add_grhead(skb, pmc, type, &pgr);
 489                 }
 490         }
 491         if (pgr)
 492                 pgr->grec_nsrcs = htons(scount);
 493
 494         if (isquery)
 495                 pmc->gsquery = 0;       /* clear query state on report */
 496         return skb;
 497 }
 498
 499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 500 {
 501         struct sk_buff *skb = NULL;
 502         int type;
 503
 504         if (!pmc) {
 505                 read_lock(&in_dev->mc_list_lock);
 506                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 507                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 508                                 continue;
 509                         spin_lock_bh(&pmc->lock);
 510                         if (pmc->sfcount[MCAST_EXCLUDE])
 511                                 type = IGMPV3_MODE_IS_EXCLUDE;
 512                         else
 513                                 type = IGMPV3_MODE_IS_INCLUDE;
 514                         skb = add_grec(skb, pmc, type, 0, 0);
 515                         spin_unlock_bh(&pmc->lock);
 516                 }
 517                 read_unlock(&in_dev->mc_list_lock);
 518         } else {
 519                 spin_lock_bh(&pmc->lock);
 520                 if (pmc->sfcount[MCAST_EXCLUDE])
 521                         type = IGMPV3_MODE_IS_EXCLUDE;
 522                 else
 523                         type = IGMPV3_MODE_IS_INCLUDE;
 524                 skb = add_grec(skb, pmc, type, 0, 0);
 525                 spin_unlock_bh(&pmc->lock);
 526         }
 527         if (!skb)
 528                 return 0;
 529         return igmpv3_sendpack(skb);
 530 }
 531
 532 /*
 533  * remove zero-count source records from a source filter list
 534  */
 535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 536 {
 537         struct ip_sf_list *psf_prev, *psf_next, *psf;
 538
 539         psf_prev = NULL;
 540         for (psf=*ppsf; psf; psf = psf_next) {
 541                 psf_next = psf->sf_next;
 542                 if (psf->sf_crcount == 0) {
 543                         if (psf_prev)
 544                                 psf_prev->sf_next = psf->sf_next;
 545                         else
 546                                 *ppsf = psf->sf_next;
 547                         kfree(psf);
 548                 } else
 549                         psf_prev = psf;
 550         }
 551 }
 552
 553 static void igmpv3_send_cr(struct in_device *in_dev)
 554 {
 555         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 556         struct sk_buff *skb = NULL;
 557         int type, dtype;
 558
 559         read_lock(&in_dev->mc_list_lock);
 560         spin_lock_bh(&in_dev->mc_tomb_lock);
 561
 562         /* deleted MCA's */
 563         pmc_prev = NULL;
 564         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 565                 pmc_next = pmc->next;
 566                 if (pmc->sfmode == MCAST_INCLUDE) {
 567                         type = IGMPV3_BLOCK_OLD_SOURCES;
 568                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 569                         skb = add_grec(skb, pmc, type, 1, 0);
 570                         skb = add_grec(skb, pmc, dtype, 1, 1);
 571                 }
 572                 if (pmc->crcount) {
 573                         if (pmc->sfmode == MCAST_EXCLUDE) {
 574                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 575                                 skb = add_grec(skb, pmc, type, 1, 0);
 576                         }
 577                         pmc->crcount--;
 578                         if (pmc->crcount == 0) {
 579                                 igmpv3_clear_zeros(&pmc->tomb);
 580                                 igmpv3_clear_zeros(&pmc->sources);
 581                         }
 582                 }
 583                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 584                         if (pmc_prev)
 585                                 pmc_prev->next = pmc_next;
 586                         else
 587                                 in_dev->mc_tomb = pmc_next;
 588                         in_dev_put(pmc->interface);
 589                         kfree(pmc);
 590                 } else
 591                         pmc_prev = pmc;
 592         }
 593         spin_unlock_bh(&in_dev->mc_tomb_lock);
 594
 595         /* change recs */
 596         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 597                 spin_lock_bh(&pmc->lock);
 598                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 599                         type = IGMPV3_BLOCK_OLD_SOURCES;
 600                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 601                 } else {
 602                         type = IGMPV3_ALLOW_NEW_SOURCES;
 603                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 604                 }
 605                 skb = add_grec(skb, pmc, type, 0, 0);
 606                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 607
 608                 /* filter mode changes */
 609                 if (pmc->crcount) {
 610                         if (pmc->sfmode == MCAST_EXCLUDE)
 611                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 612                         else
 613                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 614                         skb = add_grec(skb, pmc, type, 0, 0);
 615                         pmc->crcount--;
 616                 }
 617                 spin_unlock_bh(&pmc->lock);
 618         }
 619         read_unlock(&in_dev->mc_list_lock);
 620
 621         if (!skb)
 622                 return;
 623         (void) igmpv3_sendpack(skb);
 624 }
 625
 626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 627         int type)
 628 {
 629         struct sk_buff *skb;
 630         struct iphdr *iph;
 631         struct igmphdr *ih;
 632         struct rtable *rt;
 633         struct net_device *dev = in_dev->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(&init_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         if (dev_net(in_dev->dev) != &init_net)
1202                 return;
1203
1204         for (im=in_dev->mc_list; im; im=im->next) {
1205                 if (im->multiaddr == addr) {
1206                         im->users++;
1207                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1208                         goto out;
1209                 }
1210         }
1211
1212         im = kmalloc(sizeof(*im), GFP_KERNEL);
1213         if (!im)
1214                 goto out;
1215
1216         im->users=1;
1217         im->interface=in_dev;
1218         in_dev_hold(in_dev);
1219         im->multiaddr=addr;
1220         /* initial mode is (EX, empty) */
1221         im->sfmode = MCAST_EXCLUDE;
1222         im->sfcount[MCAST_INCLUDE] = 0;
1223         im->sfcount[MCAST_EXCLUDE] = 1;
1224         im->sources = NULL;
1225         im->tomb = NULL;
1226         im->crcount = 0;
1227         atomic_set(&im->refcnt, 1);
1228         spin_lock_init(&im->lock);
1229 #ifdef CONFIG_IP_MULTICAST
1230         im->tm_running=0;
1231         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1232         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1233         im->reporter = 0;
1234         im->gsquery = 0;
1235 #endif
1236         im->loaded = 0;
1237         write_lock_bh(&in_dev->mc_list_lock);
1238         im->next=in_dev->mc_list;
1239         in_dev->mc_list=im;
1240         write_unlock_bh(&in_dev->mc_list_lock);
1241 #ifdef CONFIG_IP_MULTICAST
1242         igmpv3_del_delrec(in_dev, im->multiaddr);
1243 #endif
1244         igmp_group_added(im);
1245         if (!in_dev->dead)
1246                 ip_rt_multicast_event(in_dev);
1247 out:
1248         return;
1249 }
1250
1251 /*
1252  *      Resend IGMP JOIN report; used for bonding.
1253  */
1254 void ip_mc_rejoin_group(struct ip_mc_list *im)
1255 {
1256 #ifdef CONFIG_IP_MULTICAST
1257         struct in_device *in_dev = im->interface;
1258
1259         if (im->multiaddr == IGMP_ALL_HOSTS)
1260                 return;
1261
1262         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1263                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1264                 return;
1265         }
1266         /* else, v3 */
1267         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1268                 IGMP_Unsolicited_Report_Count;
1269         igmp_ifc_event(in_dev);
1270 #endif
1271 }
1272
1273 /*
1274  *      A socket has left a multicast group on device dev
1275  */
1276
1277 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1278 {
1279         struct ip_mc_list *i, **ip;
1280
1281         ASSERT_RTNL();
1282
1283         if (dev_net(in_dev->dev) != &init_net)
1284                 return;
1285
1286         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1287                 if (i->multiaddr==addr) {
1288                         if (--i->users == 0) {
1289                                 write_lock_bh(&in_dev->mc_list_lock);
1290                                 *ip = i->next;
1291                                 write_unlock_bh(&in_dev->mc_list_lock);
1292                                 igmp_group_dropped(i);
1293
1294                                 if (!in_dev->dead)
1295                                         ip_rt_multicast_event(in_dev);
1296
1297                                 ip_ma_put(i);
1298                                 return;
1299                         }
1300                         break;
1301                 }
1302         }
1303 }
1304
1305 /* Device going down */
1306
1307 void ip_mc_down(struct in_device *in_dev)
1308 {
1309         struct ip_mc_list *i;
1310
1311         ASSERT_RTNL();
1312
1313         if (dev_net(in_dev->dev) != &init_net)
1314                 return;
1315
1316         for (i=in_dev->mc_list; i; i=i->next)
1317                 igmp_group_dropped(i);
1318
1319 #ifdef CONFIG_IP_MULTICAST
1320         in_dev->mr_ifc_count = 0;
1321         if (del_timer(&in_dev->mr_ifc_timer))
1322                 __in_dev_put(in_dev);
1323         in_dev->mr_gq_running = 0;
1324         if (del_timer(&in_dev->mr_gq_timer))
1325                 __in_dev_put(in_dev);
1326         igmpv3_clear_delrec(in_dev);
1327 #endif
1328
1329         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1330 }
1331
1332 void ip_mc_init_dev(struct in_device *in_dev)
1333 {
1334         ASSERT_RTNL();
1335
1336         if (dev_net(in_dev->dev) != &init_net)
1337                 return;
1338
1339         in_dev->mc_tomb = NULL;
1340 #ifdef CONFIG_IP_MULTICAST
1341         in_dev->mr_gq_running = 0;
1342         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1343                         (unsigned long)in_dev);
1344         in_dev->mr_ifc_count = 0;
1345         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1346                         (unsigned long)in_dev);
1347         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1348 #endif
1349
1350         rwlock_init(&in_dev->mc_list_lock);
1351         spin_lock_init(&in_dev->mc_tomb_lock);
1352 }
1353
1354 /* Device going up */
1355
1356 void ip_mc_up(struct in_device *in_dev)
1357 {
1358         struct ip_mc_list *i;
1359
1360         ASSERT_RTNL();
1361
1362         if (dev_net(in_dev->dev) != &init_net)
1363                 return;
1364
1365         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1366
1367         for (i=in_dev->mc_list; i; i=i->next)
1368                 igmp_group_added(i);
1369 }
1370
1371 /*
1372  *      Device is about to be destroyed: clean up.
1373  */
1374
1375 void ip_mc_destroy_dev(struct in_device *in_dev)
1376 {
1377         struct ip_mc_list *i;
1378
1379         ASSERT_RTNL();
1380
1381         if (dev_net(in_dev->dev) != &init_net)
1382                 return;
1383
1384         /* Deactivate timers */
1385         ip_mc_down(in_dev);
1386
1387         write_lock_bh(&in_dev->mc_list_lock);
1388         while ((i = in_dev->mc_list) != NULL) {
1389                 in_dev->mc_list = i->next;
1390                 write_unlock_bh(&in_dev->mc_list_lock);
1391
1392                 igmp_group_dropped(i);
1393                 ip_ma_put(i);
1394
1395                 write_lock_bh(&in_dev->mc_list_lock);
1396         }
1397         write_unlock_bh(&in_dev->mc_list_lock);
1398 }
1399
1400 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1401 {
1402         struct flowi fl = { .nl_u = { .ip4_u =
1403                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1404         struct rtable *rt;
1405         struct net_device *dev = NULL;
1406         struct in_device *idev = NULL;
1407
1408         if (imr->imr_ifindex) {
1409                 idev = inetdev_by_index(&init_net, imr->imr_ifindex);
1410                 if (idev)
1411                         __in_dev_put(idev);
1412                 return idev;
1413         }
1414         if (imr->imr_address.s_addr) {
1415                 dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
1416                 if (!dev)
1417                         return NULL;
1418                 dev_put(dev);
1419         }
1420
1421         if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) {
1422                 dev = rt->u.dst.dev;
1423                 ip_rt_put(rt);
1424         }
1425         if (dev) {
1426                 imr->imr_ifindex = dev->ifindex;
1427                 idev = __in_dev_get_rtnl(dev);
1428         }
1429         return idev;
1430 }
1431
1432 /*
1433  *      Join a socket to a group
1434  */
1435 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1436 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1437
1438
1439 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1440         __be32 *psfsrc)
1441 {
1442         struct ip_sf_list *psf, *psf_prev;
1443         int rv = 0;
1444
1445         psf_prev = NULL;
1446         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1447                 if (psf->sf_inaddr == *psfsrc)
1448                         break;
1449                 psf_prev = psf;
1450         }
1451         if (!psf || psf->sf_count[sfmode] == 0) {
1452                 /* source filter not found, or count wrong =>  bug */
1453                 return -ESRCH;
1454         }
1455         psf->sf_count[sfmode]--;
1456         if (psf->sf_count[sfmode] == 0) {
1457                 ip_rt_multicast_event(pmc->interface);
1458         }
1459         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1460 #ifdef CONFIG_IP_MULTICAST
1461                 struct in_device *in_dev = pmc->interface;
1462 #endif
1463
1464                 /* no more filters for this source */
1465                 if (psf_prev)
1466                         psf_prev->sf_next = psf->sf_next;
1467                 else
1468                         pmc->sources = psf->sf_next;
1469 #ifdef CONFIG_IP_MULTICAST
1470                 if (psf->sf_oldin &&
1471                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1472                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1473                                 IGMP_Unsolicited_Report_Count;
1474                         psf->sf_next = pmc->tomb;
1475                         pmc->tomb = psf;
1476                         rv = 1;
1477                 } else
1478 #endif
1479                         kfree(psf);
1480         }
1481         return rv;
1482 }
1483
1484 #ifndef CONFIG_IP_MULTICAST
1485 #define igmp_ifc_event(x)       do { } while (0)
1486 #endif
1487
1488 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1489                          int sfcount, __be32 *psfsrc, int delta)
1490 {
1491         struct ip_mc_list *pmc;
1492         int     changerec = 0;
1493         int     i, err;
1494
1495         if (!in_dev)
1496                 return -ENODEV;
1497         read_lock(&in_dev->mc_list_lock);
1498         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1499                 if (*pmca == pmc->multiaddr)
1500                         break;
1501         }
1502         if (!pmc) {
1503                 /* MCA not found?? bug */
1504                 read_unlock(&in_dev->mc_list_lock);
1505                 return -ESRCH;
1506         }
1507         spin_lock_bh(&pmc->lock);
1508         read_unlock(&in_dev->mc_list_lock);
1509 #ifdef CONFIG_IP_MULTICAST
1510         sf_markstate(pmc);
1511 #endif
1512         if (!delta) {
1513                 err = -EINVAL;
1514                 if (!pmc->sfcount[sfmode])
1515                         goto out_unlock;
1516                 pmc->sfcount[sfmode]--;
1517         }
1518         err = 0;
1519         for (i=0; i<sfcount; i++) {
1520                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1521
1522                 changerec |= rv > 0;
1523                 if (!err && rv < 0)
1524                         err = rv;
1525         }
1526         if (pmc->sfmode == MCAST_EXCLUDE &&
1527             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1528             pmc->sfcount[MCAST_INCLUDE]) {
1529 #ifdef CONFIG_IP_MULTICAST
1530                 struct ip_sf_list *psf;
1531 #endif
1532
1533                 /* filter mode change */
1534                 pmc->sfmode = MCAST_INCLUDE;
1535 #ifdef CONFIG_IP_MULTICAST
1536                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1537                         IGMP_Unsolicited_Report_Count;
1538                 in_dev->mr_ifc_count = pmc->crcount;
1539                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1540                         psf->sf_crcount = 0;
1541                 igmp_ifc_event(pmc->interface);
1542         } else if (sf_setstate(pmc) || changerec) {
1543                 igmp_ifc_event(pmc->interface);
1544 #endif
1545         }
1546 out_unlock:
1547         spin_unlock_bh(&pmc->lock);
1548         return err;
1549 }
1550
1551 /*
1552  * Add multicast single-source filter to the interface list
1553  */
1554 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1555         __be32 *psfsrc, int delta)
1556 {
1557         struct ip_sf_list *psf, *psf_prev;
1558
1559         psf_prev = NULL;
1560         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1561                 if (psf->sf_inaddr == *psfsrc)
1562                         break;
1563                 psf_prev = psf;
1564         }
1565         if (!psf) {
1566                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1567                 if (!psf)
1568                         return -ENOBUFS;
1569                 psf->sf_inaddr = *psfsrc;
1570                 if (psf_prev) {
1571                         psf_prev->sf_next = psf;
1572                 } else
1573                         pmc->sources = psf;
1574         }
1575         psf->sf_count[sfmode]++;
1576         if (psf->sf_count[sfmode] == 1) {
1577                 ip_rt_multicast_event(pmc->interface);
1578         }
1579         return 0;
1580 }
1581
1582 #ifdef CONFIG_IP_MULTICAST
1583 static void sf_markstate(struct ip_mc_list *pmc)
1584 {
1585         struct ip_sf_list *psf;
1586         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1587
1588         for (psf=pmc->sources; psf; psf=psf->sf_next)
1589                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1590                         psf->sf_oldin = mca_xcount ==
1591                                 psf->sf_count[MCAST_EXCLUDE] &&
1592                                 !psf->sf_count[MCAST_INCLUDE];
1593                 } else
1594                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1595 }
1596
1597 static int sf_setstate(struct ip_mc_list *pmc)
1598 {
1599         struct ip_sf_list *psf, *dpsf;
1600         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1601         int qrv = pmc->interface->mr_qrv;
1602         int new_in, rv;
1603
1604         rv = 0;
1605         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1606                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1607                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1608                                 !psf->sf_count[MCAST_INCLUDE];
1609                 } else
1610                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1611                 if (new_in) {
1612                         if (!psf->sf_oldin) {
1613                                 struct ip_sf_list *prev = NULL;
1614
1615                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1616                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1617                                                 break;
1618                                         prev = dpsf;
1619                                 }
1620                                 if (dpsf) {
1621                                         if (prev)
1622                                                 prev->sf_next = dpsf->sf_next;
1623                                         else
1624                                                 pmc->tomb = dpsf->sf_next;
1625                                         kfree(dpsf);
1626                                 }
1627                                 psf->sf_crcount = qrv;
1628                                 rv++;
1629                         }
1630                 } else if (psf->sf_oldin) {
1631
1632                         psf->sf_crcount = 0;
1633                         /*
1634                          * add or update "delete" records if an active filter
1635                          * is now inactive
1636                          */
1637                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1638                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1639                                         break;
1640                         if (!dpsf) {
1641                                 dpsf = (struct ip_sf_list *)
1642                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1643                                 if (!dpsf)
1644                                         continue;
1645                                 *dpsf = *psf;
1646                                 /* pmc->lock held by callers */
1647                                 dpsf->sf_next = pmc->tomb;
1648                                 pmc->tomb = dpsf;
1649                         }
1650                         dpsf->sf_crcount = qrv;
1651                         rv++;
1652                 }
1653         }
1654         return rv;
1655 }
1656 #endif
1657
1658 /*
1659  * Add multicast source filter list to the interface list
1660  */
1661 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1662                          int sfcount, __be32 *psfsrc, int delta)
1663 {
1664         struct ip_mc_list *pmc;
1665         int     isexclude;
1666         int     i, err;
1667
1668         if (!in_dev)
1669                 return -ENODEV;
1670         read_lock(&in_dev->mc_list_lock);
1671         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1672                 if (*pmca == pmc->multiaddr)
1673                         break;
1674         }
1675         if (!pmc) {
1676                 /* MCA not found?? bug */
1677                 read_unlock(&in_dev->mc_list_lock);
1678                 return -ESRCH;
1679         }
1680         spin_lock_bh(&pmc->lock);
1681         read_unlock(&in_dev->mc_list_lock);
1682
1683 #ifdef CONFIG_IP_MULTICAST
1684         sf_markstate(pmc);
1685 #endif
1686         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1687         if (!delta)
1688                 pmc->sfcount[sfmode]++;
1689         err = 0;
1690         for (i=0; i<sfcount; i++) {
1691                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1692                 if (err)
1693                         break;
1694         }
1695         if (err) {
1696                 int j;
1697
1698                 pmc->sfcount[sfmode]--;
1699                 for (j=0; j<i; j++)
1700                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1701         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1702 #ifdef CONFIG_IP_MULTICAST
1703                 struct ip_sf_list *psf;
1704                 in_dev = pmc->interface;
1705 #endif
1706
1707                 /* filter mode change */
1708                 if (pmc->sfcount[MCAST_EXCLUDE])
1709                         pmc->sfmode = MCAST_EXCLUDE;
1710                 else if (pmc->sfcount[MCAST_INCLUDE])
1711                         pmc->sfmode = MCAST_INCLUDE;
1712 #ifdef CONFIG_IP_MULTICAST
1713                 /* else no filters; keep old mode for reports */
1714
1715                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1716                         IGMP_Unsolicited_Report_Count;
1717                 in_dev->mr_ifc_count = pmc->crcount;
1718                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1719                         psf->sf_crcount = 0;
1720                 igmp_ifc_event(in_dev);
1721         } else if (sf_setstate(pmc)) {
1722                 igmp_ifc_event(in_dev);
1723 #endif
1724         }
1725         spin_unlock_bh(&pmc->lock);
1726         return err;
1727 }
1728
1729 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1730 {
1731         struct ip_sf_list *psf, *nextpsf;
1732
1733         for (psf=pmc->tomb; psf; psf=nextpsf) {
1734                 nextpsf = psf->sf_next;
1735                 kfree(psf);
1736         }
1737         pmc->tomb = NULL;
1738         for (psf=pmc->sources; psf; psf=nextpsf) {
1739                 nextpsf = psf->sf_next;
1740                 kfree(psf);
1741         }
1742         pmc->sources = NULL;
1743         pmc->sfmode = MCAST_EXCLUDE;
1744         pmc->sfcount[MCAST_INCLUDE] = 0;
1745         pmc->sfcount[MCAST_EXCLUDE] = 1;
1746 }
1747
1748
1749 /*
1750  * Join a multicast group
1751  */
1752 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1753 {
1754         int err;
1755         __be32 addr = imr->imr_multiaddr.s_addr;
1756         struct ip_mc_socklist *iml=NULL, *i;
1757         struct in_device *in_dev;
1758         struct inet_sock *inet = inet_sk(sk);
1759         int ifindex;
1760         int count = 0;
1761
1762         if (!ipv4_is_multicast(addr))
1763                 return -EINVAL;
1764
1765         if (sock_net(sk) != &init_net)
1766                 return -EPROTONOSUPPORT;
1767
1768         rtnl_lock();
1769
1770         in_dev = ip_mc_find_dev(imr);
1771
1772         if (!in_dev) {
1773                 iml = NULL;
1774                 err = -ENODEV;
1775                 goto done;
1776         }
1777
1778         err = -EADDRINUSE;
1779         ifindex = imr->imr_ifindex;
1780         for (i = inet->mc_list; i; i = i->next) {
1781                 if (i->multi.imr_multiaddr.s_addr == addr &&
1782                     i->multi.imr_ifindex == ifindex)
1783                         goto done;
1784                 count++;
1785         }
1786         err = -ENOBUFS;
1787         if (count >= sysctl_igmp_max_memberships)
1788                 goto done;
1789         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1790         if (iml == NULL)
1791                 goto done;
1792
1793         memcpy(&iml->multi, imr, sizeof(*imr));
1794         iml->next = inet->mc_list;
1795         iml->sflist = NULL;
1796         iml->sfmode = MCAST_EXCLUDE;
1797         inet->mc_list = iml;
1798         ip_mc_inc_group(in_dev, addr);
1799         err = 0;
1800 done:
1801         rtnl_unlock();
1802         return err;
1803 }
1804
1805 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1806                            struct in_device *in_dev)
1807 {
1808         int err;
1809
1810         if (iml->sflist == NULL) {
1811                 /* any-source empty exclude case */
1812                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1813                         iml->sfmode, 0, NULL, 0);
1814         }
1815         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1816                         iml->sfmode, iml->sflist->sl_count,
1817                         iml->sflist->sl_addr, 0);
1818         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1819         iml->sflist = NULL;
1820         return err;
1821 }
1822
1823 /*
1824  *      Ask a socket to leave a group.
1825  */
1826
1827 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1828 {
1829         struct inet_sock *inet = inet_sk(sk);
1830         struct ip_mc_socklist *iml, **imlp;
1831         struct in_device *in_dev;
1832         __be32 group = imr->imr_multiaddr.s_addr;
1833         u32 ifindex;
1834         int ret = -EADDRNOTAVAIL;
1835
1836         if (sock_net(sk) != &init_net)
1837                 return -EPROTONOSUPPORT;
1838
1839         rtnl_lock();
1840         in_dev = ip_mc_find_dev(imr);
1841         ifindex = imr->imr_ifindex;
1842         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1843                 if (iml->multi.imr_multiaddr.s_addr != group)
1844                         continue;
1845                 if (ifindex) {
1846                         if (iml->multi.imr_ifindex != ifindex)
1847                                 continue;
1848                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1849                                 iml->multi.imr_address.s_addr)
1850                         continue;
1851
1852                 (void) ip_mc_leave_src(sk, iml, in_dev);
1853
1854                 *imlp = iml->next;
1855
1856                 if (in_dev)
1857                         ip_mc_dec_group(in_dev, group);
1858                 rtnl_unlock();
1859                 sock_kfree_s(sk, iml, sizeof(*iml));
1860                 return 0;
1861         }
1862         if (!in_dev)
1863                 ret = -ENODEV;
1864         rtnl_unlock();
1865         return ret;
1866 }
1867
1868 int ip_mc_source(int add, int omode, struct sock *sk, struct
1869         ip_mreq_source *mreqs, int ifindex)
1870 {
1871         int err;
1872         struct ip_mreqn imr;
1873         __be32 addr = mreqs->imr_multiaddr;
1874         struct ip_mc_socklist *pmc;
1875         struct in_device *in_dev = NULL;
1876         struct inet_sock *inet = inet_sk(sk);
1877         struct ip_sf_socklist *psl;
1878         int leavegroup = 0;
1879         int i, j, rv;
1880
1881         if (!ipv4_is_multicast(addr))
1882                 return -EINVAL;
1883
1884         if (sock_net(sk) != &init_net)
1885                 return -EPROTONOSUPPORT;
1886
1887         rtnl_lock();
1888
1889         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1890         imr.imr_address.s_addr = mreqs->imr_interface;
1891         imr.imr_ifindex = ifindex;
1892         in_dev = ip_mc_find_dev(&imr);
1893
1894         if (!in_dev) {
1895                 err = -ENODEV;
1896                 goto done;
1897         }
1898         err = -EADDRNOTAVAIL;
1899
1900         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1901                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1902                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1903                         break;
1904         }
1905         if (!pmc) {             /* must have a prior join */
1906                 err = -EINVAL;
1907                 goto done;
1908         }
1909         /* if a source filter was set, must be the same mode as before */
1910         if (pmc->sflist) {
1911                 if (pmc->sfmode != omode) {
1912                         err = -EINVAL;
1913                         goto done;
1914                 }
1915         } else if (pmc->sfmode != omode) {
1916                 /* allow mode switches for empty-set filters */
1917                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1918                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1919                         NULL, 0);
1920                 pmc->sfmode = omode;
1921         }
1922
1923         psl = pmc->sflist;
1924         if (!add) {
1925                 if (!psl)
1926                         goto done;      /* err = -EADDRNOTAVAIL */
1927                 rv = !0;
1928                 for (i=0; i<psl->sl_count; i++) {
1929                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1930                                 sizeof(__be32));
1931                         if (rv == 0)
1932                                 break;
1933                 }
1934                 if (rv)         /* source not found */
1935                         goto done;      /* err = -EADDRNOTAVAIL */
1936
1937                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1938                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1939                         leavegroup = 1;
1940                         goto done;
1941                 }
1942
1943                 /* update the interface filter */
1944                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1945                         &mreqs->imr_sourceaddr, 1);
1946
1947                 for (j=i+1; j<psl->sl_count; j++)
1948                         psl->sl_addr[j-1] = psl->sl_addr[j];
1949                 psl->sl_count--;
1950                 err = 0;
1951                 goto done;
1952         }
1953         /* else, add a new source to the filter */
1954
1955         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1956                 err = -ENOBUFS;
1957                 goto done;
1958         }
1959         if (!psl || psl->sl_count == psl->sl_max) {
1960                 struct ip_sf_socklist *newpsl;
1961                 int count = IP_SFBLOCK;
1962
1963                 if (psl)
1964                         count += psl->sl_max;
1965                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1966                 if (!newpsl) {
1967                         err = -ENOBUFS;
1968                         goto done;
1969                 }
1970                 newpsl->sl_max = count;
1971                 newpsl->sl_count = count - IP_SFBLOCK;
1972                 if (psl) {
1973                         for (i=0; i<psl->sl_count; i++)
1974                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1975                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1976                 }
1977                 pmc->sflist = psl = newpsl;
1978         }
1979         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1980         for (i=0; i<psl->sl_count; i++) {
1981                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1982                         sizeof(__be32));
1983                 if (rv == 0)
1984                         break;
1985         }
1986         if (rv == 0)            /* address already there is an error */
1987                 goto done;
1988         for (j=psl->sl_count-1; j>=i; j--)
1989                 psl->sl_addr[j+1] = psl->sl_addr[j];
1990         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1991         psl->sl_count++;
1992         err = 0;
1993         /* update the interface list */
1994         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1995                 &mreqs->imr_sourceaddr, 1);
1996 done:
1997         rtnl_unlock();
1998         if (leavegroup)
1999                 return ip_mc_leave_group(sk, &imr);
2000         return err;
2001 }
2002
2003 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2004 {
2005         int err = 0;
2006         struct ip_mreqn imr;
2007         __be32 addr = msf->imsf_multiaddr;
2008         struct ip_mc_socklist *pmc;
2009         struct in_device *in_dev;
2010         struct inet_sock *inet = inet_sk(sk);
2011         struct ip_sf_socklist *newpsl, *psl;
2012         int leavegroup = 0;
2013
2014         if (!ipv4_is_multicast(addr))
2015                 return -EINVAL;
2016         if (msf->imsf_fmode != MCAST_INCLUDE &&
2017             msf->imsf_fmode != MCAST_EXCLUDE)
2018                 return -EINVAL;
2019
2020         if (sock_net(sk) != &init_net)
2021                 return -EPROTONOSUPPORT;
2022
2023         rtnl_lock();
2024
2025         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2026         imr.imr_address.s_addr = msf->imsf_interface;
2027         imr.imr_ifindex = ifindex;
2028         in_dev = ip_mc_find_dev(&imr);
2029
2030         if (!in_dev) {
2031                 err = -ENODEV;
2032                 goto done;
2033         }
2034
2035         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2036         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2037                 leavegroup = 1;
2038                 goto done;
2039         }
2040
2041         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2042                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2043                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2044                         break;
2045         }
2046         if (!pmc) {             /* must have a prior join */
2047                 err = -EINVAL;
2048                 goto done;
2049         }
2050         if (msf->imsf_numsrc) {
2051                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2052                                                            GFP_KERNEL);
2053                 if (!newpsl) {
2054                         err = -ENOBUFS;
2055                         goto done;
2056                 }
2057                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2058                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2059                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2060                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2061                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2062                 if (err) {
2063                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2064                         goto done;
2065                 }
2066         } else {
2067                 newpsl = NULL;
2068                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2069                                      msf->imsf_fmode, 0, NULL, 0);
2070         }
2071         psl = pmc->sflist;
2072         if (psl) {
2073                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2074                         psl->sl_count, psl->sl_addr, 0);
2075                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2076         } else
2077                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2078                         0, NULL, 0);
2079         pmc->sflist = newpsl;
2080         pmc->sfmode = msf->imsf_fmode;
2081         err = 0;
2082 done:
2083         rtnl_unlock();
2084         if (leavegroup)
2085                 err = ip_mc_leave_group(sk, &imr);
2086         return err;
2087 }
2088
2089 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2090         struct ip_msfilter __user *optval, int __user *optlen)
2091 {
2092         int err, len, count, copycount;
2093         struct ip_mreqn imr;
2094         __be32 addr = msf->imsf_multiaddr;
2095         struct ip_mc_socklist *pmc;
2096         struct in_device *in_dev;
2097         struct inet_sock *inet = inet_sk(sk);
2098         struct ip_sf_socklist *psl;
2099
2100         if (!ipv4_is_multicast(addr))
2101                 return -EINVAL;
2102
2103         if (sock_net(sk) != &init_net)
2104                 return -EPROTONOSUPPORT;
2105
2106         rtnl_lock();
2107
2108         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2109         imr.imr_address.s_addr = msf->imsf_interface;
2110         imr.imr_ifindex = 0;
2111         in_dev = ip_mc_find_dev(&imr);
2112
2113         if (!in_dev) {
2114                 err = -ENODEV;
2115                 goto done;
2116         }
2117         err = -EADDRNOTAVAIL;
2118
2119         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2120                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2121                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2122                         break;
2123         }
2124         if (!pmc)               /* must have a prior join */
2125                 goto done;
2126         msf->imsf_fmode = pmc->sfmode;
2127         psl = pmc->sflist;
2128         rtnl_unlock();
2129         if (!psl) {
2130                 len = 0;
2131                 count = 0;
2132         } else {
2133                 count = psl->sl_count;
2134         }
2135         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2136         len = copycount * sizeof(psl->sl_addr[0]);
2137         msf->imsf_numsrc = count;
2138         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2139             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2140                 return -EFAULT;
2141         }
2142         if (len &&
2143             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2144                 return -EFAULT;
2145         return 0;
2146 done:
2147         rtnl_unlock();
2148         return err;
2149 }
2150
2151 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2152         struct group_filter __user *optval, int __user *optlen)
2153 {
2154         int err, i, count, copycount;
2155         struct sockaddr_in *psin;
2156         __be32 addr;
2157         struct ip_mc_socklist *pmc;
2158         struct inet_sock *inet = inet_sk(sk);
2159         struct ip_sf_socklist *psl;
2160
2161         psin = (struct sockaddr_in *)&gsf->gf_group;
2162         if (psin->sin_family != AF_INET)
2163                 return -EINVAL;
2164         addr = psin->sin_addr.s_addr;
2165         if (!ipv4_is_multicast(addr))
2166                 return -EINVAL;
2167
2168         if (sock_net(sk) != &init_net)
2169                 return -EPROTONOSUPPORT;
2170
2171         rtnl_lock();
2172
2173         err = -EADDRNOTAVAIL;
2174
2175         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2176                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2177                     pmc->multi.imr_ifindex == gsf->gf_interface)
2178                         break;
2179         }
2180         if (!pmc)               /* must have a prior join */
2181                 goto done;
2182         gsf->gf_fmode = pmc->sfmode;
2183         psl = pmc->sflist;
2184         rtnl_unlock();
2185         count = psl ? psl->sl_count : 0;
2186         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2187         gsf->gf_numsrc = count;
2188         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2189             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2190                 return -EFAULT;
2191         }
2192         for (i=0; i<copycount; i++) {
2193                 struct sockaddr_storage ss;
2194
2195                 psin = (struct sockaddr_in *)&ss;
2196                 memset(&ss, 0, sizeof(ss));
2197                 psin->sin_family = AF_INET;
2198                 psin->sin_addr.s_addr = psl->sl_addr[i];
2199                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2200                         return -EFAULT;
2201         }
2202         return 0;
2203 done:
2204         rtnl_unlock();
2205         return err;
2206 }
2207
2208 /*
2209  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2210  */
2211 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2212 {
2213         struct inet_sock *inet = inet_sk(sk);
2214         struct ip_mc_socklist *pmc;
2215         struct ip_sf_socklist *psl;
2216         int i;
2217
2218         if (!ipv4_is_multicast(loc_addr))
2219                 return 1;
2220
2221         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2222                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2223                     pmc->multi.imr_ifindex == dif)
2224                         break;
2225         }
2226         if (!pmc)
2227                 return 1;
2228         psl = pmc->sflist;
2229         if (!psl)
2230                 return pmc->sfmode == MCAST_EXCLUDE;
2231
2232         for (i=0; i<psl->sl_count; i++) {
2233                 if (psl->sl_addr[i] == rmt_addr)
2234                         break;
2235         }
2236         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2237                 return 0;
2238         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2239                 return 0;
2240         return 1;
2241 }
2242
2243 /*
2244  *      A socket is closing.
2245  */
2246
2247 void ip_mc_drop_socket(struct sock *sk)
2248 {
2249         struct inet_sock *inet = inet_sk(sk);
2250         struct ip_mc_socklist *iml;
2251
2252         if (inet->mc_list == NULL)
2253                 return;
2254
2255         if (sock_net(sk) != &init_net)
2256                 return;
2257
2258         rtnl_lock();
2259         while ((iml = inet->mc_list) != NULL) {
2260                 struct in_device *in_dev;
2261                 inet->mc_list = iml->next;
2262
2263                 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex);
2264                 (void) ip_mc_leave_src(sk, iml, in_dev);
2265                 if (in_dev != NULL) {
2266                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2267                         in_dev_put(in_dev);
2268                 }
2269                 sock_kfree_s(sk, iml, sizeof(*iml));
2270         }
2271         rtnl_unlock();
2272 }
2273
2274 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2275 {
2276         struct ip_mc_list *im;
2277         struct ip_sf_list *psf;
2278         int rv = 0;
2279
2280         read_lock(&in_dev->mc_list_lock);
2281         for (im=in_dev->mc_list; im; im=im->next) {
2282                 if (im->multiaddr == mc_addr)
2283                         break;
2284         }
2285         if (im && proto == IPPROTO_IGMP) {
2286                 rv = 1;
2287         } else if (im) {
2288                 if (src_addr) {
2289                         for (psf=im->sources; psf; psf=psf->sf_next) {
2290                                 if (psf->sf_inaddr == src_addr)
2291                                         break;
2292                         }
2293                         if (psf)
2294                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2295                                         psf->sf_count[MCAST_EXCLUDE] !=
2296                                         im->sfcount[MCAST_EXCLUDE];
2297                         else
2298                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2299                 } else
2300                         rv = 1; /* unspecified source; tentatively allow */
2301         }
2302         read_unlock(&in_dev->mc_list_lock);
2303         return rv;
2304 }
2305
2306 #if defined(CONFIG_PROC_FS)
2307 struct igmp_mc_iter_state {
2308         struct net_device *dev;
2309         struct in_device *in_dev;
2310 };
2311
2312 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2313
2314 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2315 {
2316         struct ip_mc_list *im = NULL;
2317         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2318
2319         state->in_dev = NULL;
2320         for_each_netdev(&init_net, state->dev) {
2321                 struct in_device *in_dev;
2322                 in_dev = in_dev_get(state->dev);
2323                 if (!in_dev)
2324                         continue;
2325                 read_lock(&in_dev->mc_list_lock);
2326                 im = in_dev->mc_list;
2327                 if (im) {
2328                         state->in_dev = in_dev;
2329                         break;
2330                 }
2331                 read_unlock(&in_dev->mc_list_lock);
2332                 in_dev_put(in_dev);
2333         }
2334         return im;
2335 }
2336
2337 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2338 {
2339         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2340         im = im->next;
2341         while (!im) {
2342                 if (likely(state->in_dev != NULL)) {
2343                         read_unlock(&state->in_dev->mc_list_lock);
2344                         in_dev_put(state->in_dev);
2345                 }
2346                 state->dev = next_net_device(state->dev);
2347                 if (!state->dev) {
2348                         state->in_dev = NULL;
2349                         break;
2350                 }
2351                 state->in_dev = in_dev_get(state->dev);
2352                 if (!state->in_dev)
2353                         continue;
2354                 read_lock(&state->in_dev->mc_list_lock);
2355                 im = state->in_dev->mc_list;
2356         }
2357         return im;
2358 }
2359
2360 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2361 {
2362         struct ip_mc_list *im = igmp_mc_get_first(seq);
2363         if (im)
2364                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2365                         --pos;
2366         return pos ? NULL : im;
2367 }
2368
2369 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2370         __acquires(dev_base_lock)
2371 {
2372         read_lock(&dev_base_lock);
2373         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2374 }
2375
2376 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2377 {
2378         struct ip_mc_list *im;
2379         if (v == SEQ_START_TOKEN)
2380                 im = igmp_mc_get_first(seq);
2381         else
2382                 im = igmp_mc_get_next(seq, v);
2383         ++*pos;
2384         return im;
2385 }
2386
2387 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2388         __releases(dev_base_lock)
2389 {
2390         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2391         if (likely(state->in_dev != NULL)) {
2392                 read_unlock(&state->in_dev->mc_list_lock);
2393                 in_dev_put(state->in_dev);
2394                 state->in_dev = NULL;
2395         }
2396         state->dev = NULL;
2397         read_unlock(&dev_base_lock);
2398 }
2399
2400 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2401 {
2402         if (v == SEQ_START_TOKEN)
2403                 seq_puts(seq,
2404                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2405         else {
2406                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2407                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2408                 char   *querier;
2409 #ifdef CONFIG_IP_MULTICAST
2410                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2411                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2412                           "V3";
2413 #else
2414                 querier = "NONE";
2415 #endif
2416
2417                 if (state->in_dev->mc_list == im) {
2418                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2419                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2420                 }
2421
2422                 seq_printf(seq,
2423                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2424                            im->multiaddr, im->users,
2425                            im->tm_running, im->tm_running ?
2426                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2427                            im->reporter);
2428         }
2429         return 0;
2430 }
2431
2432 static const struct seq_operations igmp_mc_seq_ops = {
2433         .start  =       igmp_mc_seq_start,
2434         .next   =       igmp_mc_seq_next,
2435         .stop   =       igmp_mc_seq_stop,
2436         .show   =       igmp_mc_seq_show,
2437 };
2438
2439 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2440 {
2441         return seq_open_private(file, &igmp_mc_seq_ops,
2442                         sizeof(struct igmp_mc_iter_state));
2443 }
2444
2445 static const struct file_operations igmp_mc_seq_fops = {
2446         .owner          =       THIS_MODULE,
2447         .open           =       igmp_mc_seq_open,
2448         .read           =       seq_read,
2449         .llseek         =       seq_lseek,
2450         .release        =       seq_release_private,
2451 };
2452
2453 struct igmp_mcf_iter_state {
2454         struct net_device *dev;
2455         struct in_device *idev;
2456         struct ip_mc_list *im;
2457 };
2458
2459 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2460
2461 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2462 {
2463         struct ip_sf_list *psf = NULL;
2464         struct ip_mc_list *im = NULL;
2465         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2466
2467         state->idev = NULL;
2468         state->im = NULL;
2469         for_each_netdev(&init_net, state->dev) {
2470                 struct in_device *idev;
2471                 idev = in_dev_get(state->dev);
2472                 if (unlikely(idev == NULL))
2473                         continue;
2474                 read_lock(&idev->mc_list_lock);
2475                 im = idev->mc_list;
2476                 if (likely(im != NULL)) {
2477                         spin_lock_bh(&im->lock);
2478                         psf = im->sources;
2479                         if (likely(psf != NULL)) {
2480                                 state->im = im;
2481                                 state->idev = idev;
2482                                 break;
2483                         }
2484                         spin_unlock_bh(&im->lock);
2485                 }
2486                 read_unlock(&idev->mc_list_lock);
2487                 in_dev_put(idev);
2488         }
2489         return psf;
2490 }
2491
2492 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2493 {
2494         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2495
2496         psf = psf->sf_next;
2497         while (!psf) {
2498                 spin_unlock_bh(&state->im->lock);
2499                 state->im = state->im->next;
2500                 while (!state->im) {
2501                         if (likely(state->idev != NULL)) {
2502                                 read_unlock(&state->idev->mc_list_lock);
2503                                 in_dev_put(state->idev);
2504                         }
2505                         state->dev = next_net_device(state->dev);
2506                         if (!state->dev) {
2507                                 state->idev = NULL;
2508                                 goto out;
2509                         }
2510                         state->idev = in_dev_get(state->dev);
2511                         if (!state->idev)
2512                                 continue;
2513                         read_lock(&state->idev->mc_list_lock);
2514                         state->im = state->idev->mc_list;
2515                 }
2516                 if (!state->im)
2517                         break;
2518                 spin_lock_bh(&state->im->lock);
2519                 psf = state->im->sources;
2520         }
2521 out:
2522         return psf;
2523 }
2524
2525 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2526 {
2527         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2528         if (psf)
2529                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2530                         --pos;
2531         return pos ? NULL : psf;
2532 }
2533
2534 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2535 {
2536         read_lock(&dev_base_lock);
2537         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2538 }
2539
2540 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2541 {
2542         struct ip_sf_list *psf;
2543         if (v == SEQ_START_TOKEN)
2544                 psf = igmp_mcf_get_first(seq);
2545         else
2546                 psf = igmp_mcf_get_next(seq, v);
2547         ++*pos;
2548         return psf;
2549 }
2550
2551 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2552 {
2553         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2554         if (likely(state->im != NULL)) {
2555                 spin_unlock_bh(&state->im->lock);
2556                 state->im = NULL;
2557         }
2558         if (likely(state->idev != NULL)) {
2559                 read_unlock(&state->idev->mc_list_lock);
2560                 in_dev_put(state->idev);
2561                 state->idev = NULL;
2562         }
2563         state->dev = NULL;
2564         read_unlock(&dev_base_lock);
2565 }
2566
2567 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2568 {
2569         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2570         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2571
2572         if (v == SEQ_START_TOKEN) {
2573                 seq_printf(seq,
2574                            "%3s %6s "
2575                            "%10s %10s %6s %6s\n", "Idx",
2576                            "Device", "MCA",
2577                            "SRC", "INC", "EXC");
2578         } else {
2579                 seq_printf(seq,
2580                            "%3d %6.6s 0x%08x "
2581                            "0x%08x %6lu %6lu\n",
2582                            state->dev->ifindex, state->dev->name,
2583                            ntohl(state->im->multiaddr),
2584                            ntohl(psf->sf_inaddr),
2585                            psf->sf_count[MCAST_INCLUDE],
2586                            psf->sf_count[MCAST_EXCLUDE]);
2587         }
2588         return 0;
2589 }
2590
2591 static const struct seq_operations igmp_mcf_seq_ops = {
2592         .start  =       igmp_mcf_seq_start,
2593         .next   =       igmp_mcf_seq_next,
2594         .stop   =       igmp_mcf_seq_stop,
2595         .show   =       igmp_mcf_seq_show,
2596 };
2597
2598 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2599 {
2600         return seq_open_private(file, &igmp_mcf_seq_ops,
2601                         sizeof(struct igmp_mcf_iter_state));
2602 }
2603
2604 static const struct file_operations igmp_mcf_seq_fops = {
2605         .owner          =       THIS_MODULE,
2606         .open           =       igmp_mcf_seq_open,
2607         .read           =       seq_read,
2608         .llseek         =       seq_lseek,
2609         .release        =       seq_release_private,
2610 };
2611
2612 int __init igmp_mc_proc_init(void)
2613 {
2614         proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2615         proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2616         return 0;
2617 }
2618 #endif
2619
2620 EXPORT_SYMBOL(ip_mc_dec_group);
2621 EXPORT_SYMBOL(ip_mc_inc_group);
2622 EXPORT_SYMBOL(ip_mc_join_group);
2623 EXPORT_SYMBOL(ip_mc_rejoin_group);