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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  *      Authors:
  12  *              Alan Cox <alan@lxorguk.ukuu.org.uk>
  13  *
  14  *      This program is free software; you can redistribute it and/or
  15  *      modify it under the terms of the GNU General Public License
  16  *      as published by the Free Software Foundation; either version
  17  *      2 of the License, or (at your option) any later version.
  18  *
  19  *      Fixes:
  20  *
  21  *              Alan Cox        :       Added lots of __inline__ to optimise
  22  *                                      the memory usage of all the tiny little
  23  *                                      functions.
  24  *              Alan Cox        :       Dumped the header building experiment.
  25  *              Alan Cox        :       Minor tweaks ready for multicast routing
  26  *                                      and extended IGMP protocol.
  27  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  28  *                                      writes utterly bogus code otherwise (sigh)
  29  *                                      fixed IGMP loopback to behave in the manner
  30  *                                      desired by mrouted, fixed the fact it has been
  31  *                                      broken since 1.3.6 and cleaned up a few minor
  32  *                                      points.
  33  *
  34  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  35  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  36  *                                      The enhancements are mainly based on Steve Deering's
  37  *                                      ipmulti-3.5 source code.
  38  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  39  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  40  *                                      the mrouted version on that device.
  41  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  42  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  43  *                                      to identify the multicast router version
  44  *                                      and do what the IGMP version 2 specified.
  45  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  46  *              Tsu-Sheng Tsao          if the specified time expired.
  47  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  48  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  49  *              Christian Daudt :       igmp timer wasn't set for local group
  50  *                                      memberships but was being deleted,
  51  *                                      which caused a "del_timer() called
  52  *                                      from %p with timer not initialized\n"
  53  *                                      message (960131).
  54  *              Christian Daudt :       removed del_timer from
  55  *                                      igmp_timer_expire function (960205).
  56  *             Christian Daudt :       igmp_heard_report now only calls
  57  *                                     igmp_timer_expire if tm->running is
  58  *                                     true (960216).
  59  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  60  *                                      igmp_heard_query never trigger. Expiry
  61  *                                      miscalculation fixed in igmp_heard_query
  62  *                                      and random() made to return unsigned to
  63  *                                      prevent negative expiry times.
  64  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  65  *                                      fix from pending 2.1.x patches.
  66  *              Alan Cox:               Forget to enable FDDI support earlier.
  67  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  68  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  69  *              David L Stevens:        IGMPv3 support, with help from
  70  *                                      Vinay Kulkarni
  71  */
  72
  73 #include <linux/module.h>
  74 #include <asm/uaccess.h>
  75 #include <asm/system.h>
  76 #include <linux/types.h>
  77 #include <linux/kernel.h>
  78 #include <linux/jiffies.h>
  79 #include <linux/string.h>
  80 #include <linux/socket.h>
  81 #include <linux/sockios.h>
  82 #include <linux/in.h>
  83 #include <linux/inet.h>
  84 #include <linux/netdevice.h>
  85 #include <linux/skbuff.h>
  86 #include <linux/inetdevice.h>
  87 #include <linux/igmp.h>
  88 #include <linux/if_arp.h>
  89 #include <linux/rtnetlink.h>
  90 #include <linux/times.h>
  91
  92 #include <net/net_namespace.h>
  93 #include <net/arp.h>
  94 #include <net/ip.h>
  95 #include <net/protocol.h>
  96 #include <net/route.h>
  97 #include <net/sock.h>
  98 #include <net/checksum.h>
  99 #include <linux/netfilter_ipv4.h>
 100 #ifdef CONFIG_IP_MROUTE
 101 #include <linux/mroute.h>
 102 #endif
 103 #ifdef CONFIG_PROC_FS
 104 #include <linux/proc_fs.h>
 105 #include <linux/seq_file.h>
 106 #endif
 107
 108 #define IP_MAX_MEMBERSHIPS      20
 109 #define IP_MAX_MSF              10
 110
 111 #ifdef CONFIG_IP_MULTICAST
 112 /* Parameter names and values are taken from igmp-v2-06 draft */
 113
 114 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 115 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 116 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 117 #define IGMP_Query_Response_Interval            (10*HZ)
 118 #define IGMP_Unsolicited_Report_Count           2
 119
 120
 121 #define IGMP_Initial_Report_Delay               (1)
 122
 123 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 124  * IGMP specs require to report membership immediately after
 125  * joining a group, but we delay the first report by a
 126  * small interval. It seems more natural and still does not
 127  * contradict to specs provided this delay is small enough.
 128  */
 129
 130 #define IGMP_V1_SEEN(in_dev) \
 131         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 132          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 133          ((in_dev)->mr_v1_seen && \
 134           time_before(jiffies, (in_dev)->mr_v1_seen)))
 135 #define IGMP_V2_SEEN(in_dev) \
 136         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 137          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 138          ((in_dev)->mr_v2_seen && \
 139           time_before(jiffies, (in_dev)->mr_v2_seen)))
 140
 141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 143 static void igmpv3_clear_delrec(struct in_device *in_dev);
 144 static int sf_setstate(struct ip_mc_list *pmc);
 145 static void sf_markstate(struct ip_mc_list *pmc);
 146 #endif
 147 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 149                          int sfcount, __be32 *psfsrc, int delta);
 150
 151 static void ip_ma_put(struct ip_mc_list *im)
 152 {
 153         if (atomic_dec_and_test(&im->refcnt)) {
 154                 in_dev_put(im->interface);
 155                 kfree(im);
 156         }
 157 }
 158
 159 #ifdef CONFIG_IP_MULTICAST
 160
 161 /*
 162  *      Timer management
 163  */
 164
 165 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 166 {
 167         spin_lock_bh(&im->lock);
 168         if (del_timer(&im->timer))
 169                 atomic_dec(&im->refcnt);
 170         im->tm_running = 0;
 171         im->reporter = 0;
 172         im->unsolicit_count = 0;
 173         spin_unlock_bh(&im->lock);
 174 }
 175
 176 /* It must be called with locked im->lock */
 177 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 178 {
 179         int tv = net_random() % max_delay;
 180
 181         im->tm_running = 1;
 182         if (!mod_timer(&im->timer, jiffies+tv+2))
 183                 atomic_inc(&im->refcnt);
 184 }
 185
 186 static void igmp_gq_start_timer(struct in_device *in_dev)
 187 {
 188         int tv = net_random() % in_dev->mr_maxdelay;
 189
 190         in_dev->mr_gq_running = 1;
 191         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 192                 in_dev_hold(in_dev);
 193 }
 194
 195 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 196 {
 197         int tv = net_random() % delay;
 198
 199         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 200                 in_dev_hold(in_dev);
 201 }
 202
 203 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 204 {
 205         spin_lock_bh(&im->lock);
 206         im->unsolicit_count = 0;
 207         if (del_timer(&im->timer)) {
 208                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 209                         add_timer(&im->timer);
 210                         im->tm_running = 1;
 211                         spin_unlock_bh(&im->lock);
 212                         return;
 213                 }
 214                 atomic_dec(&im->refcnt);
 215         }
 216         igmp_start_timer(im, max_delay);
 217         spin_unlock_bh(&im->lock);
 218 }
 219
 220
 221 /*
 222  *      Send an IGMP report.
 223  */
 224
 225 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 226
 227
 228 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 229         int gdeleted, int sdeleted)
 230 {
 231         switch (type) {
 232         case IGMPV3_MODE_IS_INCLUDE:
 233         case IGMPV3_MODE_IS_EXCLUDE:
 234                 if (gdeleted || sdeleted)
 235                         return 0;
 236                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 237                         if (pmc->sfmode == MCAST_INCLUDE)
 238                                 return 1;
 239                         /* don't include if this source is excluded
 240                          * in all filters
 241                          */
 242                         if (psf->sf_count[MCAST_INCLUDE])
 243                                 return type == IGMPV3_MODE_IS_INCLUDE;
 244                         return pmc->sfcount[MCAST_EXCLUDE] ==
 245                                 psf->sf_count[MCAST_EXCLUDE];
 246                 }
 247                 return 0;
 248         case IGMPV3_CHANGE_TO_INCLUDE:
 249                 if (gdeleted || sdeleted)
 250                         return 0;
 251                 return psf->sf_count[MCAST_INCLUDE] != 0;
 252         case IGMPV3_CHANGE_TO_EXCLUDE:
 253                 if (gdeleted || sdeleted)
 254                         return 0;
 255                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 256                     psf->sf_count[MCAST_INCLUDE])
 257                         return 0;
 258                 return pmc->sfcount[MCAST_EXCLUDE] ==
 259                         psf->sf_count[MCAST_EXCLUDE];
 260         case IGMPV3_ALLOW_NEW_SOURCES:
 261                 if (gdeleted || !psf->sf_crcount)
 262                         return 0;
 263                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 264         case IGMPV3_BLOCK_OLD_SOURCES:
 265                 if (pmc->sfmode == MCAST_INCLUDE)
 266                         return gdeleted || (psf->sf_crcount && sdeleted);
 267                 return psf->sf_crcount && !gdeleted && !sdeleted;
 268         }
 269         return 0;
 270 }
 271
 272 static int
 273 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 274 {
 275         struct ip_sf_list *psf;
 276         int scount = 0;
 277
 278         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 279                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 280                         continue;
 281                 scount++;
 282         }
 283         return scount;
 284 }
 285
 286 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 287 {
 288         struct sk_buff *skb;
 289         struct rtable *rt;
 290         struct iphdr *pip;
 291         struct igmpv3_report *pig;
 292         struct net *net = dev_net(dev);
 293
 294         skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 295         if (skb == NULL)
 296                 return NULL;
 297
 298         {
 299                 struct flowi fl = { .oif = dev->ifindex,
 300                                     .nl_u = { .ip4_u = {
 301                                     .daddr = IGMPV3_ALL_MCR } },
 302                                     .proto = IPPROTO_IGMP };
 303                 if (ip_route_output_key(net, &rt, &fl)) {
 304                         kfree_skb(skb);
 305                         return NULL;
 306                 }
 307         }
 308         if (rt->rt_src == 0) {
 309                 kfree_skb(skb);
 310                 ip_rt_put(rt);
 311                 return NULL;
 312         }
 313
 314         skb->dst = &rt->u.dst;
 315         skb->dev = dev;
 316
 317         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 318
 319         skb_reset_network_header(skb);
 320         pip = ip_hdr(skb);
 321         skb_put(skb, sizeof(struct iphdr) + 4);
 322
 323         pip->version  = 4;
 324         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 325         pip->tos      = 0xc0;
 326         pip->frag_off = htons(IP_DF);
 327         pip->ttl      = 1;
 328         pip->daddr    = rt->rt_dst;
 329         pip->saddr    = rt->rt_src;
 330         pip->protocol = IPPROTO_IGMP;
 331         pip->tot_len  = 0;      /* filled in later */
 332         ip_select_ident(pip, &rt->u.dst, NULL);
 333         ((u8*)&pip[1])[0] = IPOPT_RA;
 334         ((u8*)&pip[1])[1] = 4;
 335         ((u8*)&pip[1])[2] = 0;
 336         ((u8*)&pip[1])[3] = 0;
 337
 338         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 339         skb_put(skb, sizeof(*pig));
 340         pig = igmpv3_report_hdr(skb);
 341         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 342         pig->resv1 = 0;
 343         pig->csum = 0;
 344         pig->resv2 = 0;
 345         pig->ngrec = 0;
 346         return skb;
 347 }
 348
 349 static int igmpv3_sendpack(struct sk_buff *skb)
 350 {
 351         struct igmphdr *pig = igmp_hdr(skb);
 352         const int igmplen = skb->tail - skb->transport_header;
 353
 354         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 355
 356         return ip_local_out(skb);
 357 }
 358
 359 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 360 {
 361         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
 362 }
 363
 364 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 365         int type, struct igmpv3_grec **ppgr)
 366 {
 367         struct net_device *dev = pmc->interface->dev;
 368         struct igmpv3_report *pih;
 369         struct igmpv3_grec *pgr;
 370
 371         if (!skb)
 372                 skb = igmpv3_newpack(dev, dev->mtu);
 373         if (!skb)
 374                 return NULL;
 375         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 376         pgr->grec_type = type;
 377         pgr->grec_auxwords = 0;
 378         pgr->grec_nsrcs = 0;
 379         pgr->grec_mca = pmc->multiaddr;
 380         pih = igmpv3_report_hdr(skb);
 381         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 382         *ppgr = pgr;
 383         return skb;
 384 }
 385
 386 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 387         skb_tailroom(skb)) : 0)
 388
 389 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 390         int type, int gdeleted, int sdeleted)
 391 {
 392         struct net_device *dev = pmc->interface->dev;
 393         struct igmpv3_report *pih;
 394         struct igmpv3_grec *pgr = NULL;
 395         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 396         int scount, stotal, first, isquery, truncate;
 397
 398         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 399                 return skb;
 400
 401         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 402                   type == IGMPV3_MODE_IS_EXCLUDE;
 403         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 404                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 405
 406         stotal = scount = 0;
 407
 408         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 409
 410         if (!*psf_list)
 411                 goto empty_source;
 412
 413         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 414
 415         /* EX and TO_EX get a fresh packet, if needed */
 416         if (truncate) {
 417                 if (pih && pih->ngrec &&
 418                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 419                         if (skb)
 420                                 igmpv3_sendpack(skb);
 421                         skb = igmpv3_newpack(dev, dev->mtu);
 422                 }
 423         }
 424         first = 1;
 425         psf_prev = NULL;
 426         for (psf=*psf_list; psf; psf=psf_next) {
 427                 __be32 *psrc;
 428
 429                 psf_next = psf->sf_next;
 430
 431                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 432                         psf_prev = psf;
 433                         continue;
 434                 }
 435
 436                 /* clear marks on query responses */
 437                 if (isquery)
 438                         psf->sf_gsresp = 0;
 439
 440                 if (AVAILABLE(skb) < sizeof(__be32) +
 441                     first*sizeof(struct igmpv3_grec)) {
 442                         if (truncate && !first)
 443                                 break;   /* truncate these */
 444                         if (pgr)
 445                                 pgr->grec_nsrcs = htons(scount);
 446                         if (skb)
 447                                 igmpv3_sendpack(skb);
 448                         skb = igmpv3_newpack(dev, dev->mtu);
 449                         first = 1;
 450                         scount = 0;
 451                 }
 452                 if (first) {
 453                         skb = add_grhead(skb, pmc, type, &pgr);
 454                         first = 0;
 455                 }
 456                 if (!skb)
 457                         return NULL;
 458                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 459                 *psrc = psf->sf_inaddr;
 460                 scount++; stotal++;
 461                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 462                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 463                         psf->sf_crcount--;
 464                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 465                                 if (psf_prev)
 466                                         psf_prev->sf_next = psf->sf_next;
 467                                 else
 468                                         *psf_list = psf->sf_next;
 469                                 kfree(psf);
 470                                 continue;
 471                         }
 472                 }
 473                 psf_prev = psf;
 474         }
 475
 476 empty_source:
 477         if (!stotal) {
 478                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 479                     type == IGMPV3_BLOCK_OLD_SOURCES)
 480                         return skb;
 481                 if (pmc->crcount || isquery) {
 482                         /* make sure we have room for group header */
 483                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 484                                 igmpv3_sendpack(skb);
 485                                 skb = NULL; /* add_grhead will get a new one */
 486                         }
 487                         skb = add_grhead(skb, pmc, type, &pgr);
 488                 }
 489         }
 490         if (pgr)
 491                 pgr->grec_nsrcs = htons(scount);
 492
 493         if (isquery)
 494                 pmc->gsquery = 0;       /* clear query state on report */
 495         return skb;
 496 }
 497
 498 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 499 {
 500         struct sk_buff *skb = NULL;
 501         int type;
 502
 503         if (!pmc) {
 504                 read_lock(&in_dev->mc_list_lock);
 505                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 506                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 507                                 continue;
 508                         spin_lock_bh(&pmc->lock);
 509                         if (pmc->sfcount[MCAST_EXCLUDE])
 510                                 type = IGMPV3_MODE_IS_EXCLUDE;
 511                         else
 512                                 type = IGMPV3_MODE_IS_INCLUDE;
 513                         skb = add_grec(skb, pmc, type, 0, 0);
 514                         spin_unlock_bh(&pmc->lock);
 515                 }
 516                 read_unlock(&in_dev->mc_list_lock);
 517         } else {
 518                 spin_lock_bh(&pmc->lock);
 519                 if (pmc->sfcount[MCAST_EXCLUDE])
 520                         type = IGMPV3_MODE_IS_EXCLUDE;
 521                 else
 522                         type = IGMPV3_MODE_IS_INCLUDE;
 523                 skb = add_grec(skb, pmc, type, 0, 0);
 524                 spin_unlock_bh(&pmc->lock);
 525         }
 526         if (!skb)
 527                 return 0;
 528         return igmpv3_sendpack(skb);
 529 }
 530
 531 /*
 532  * remove zero-count source records from a source filter list
 533  */
 534 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 535 {
 536         struct ip_sf_list *psf_prev, *psf_next, *psf;
 537
 538         psf_prev = NULL;
 539         for (psf=*ppsf; psf; psf = psf_next) {
 540                 psf_next = psf->sf_next;
 541                 if (psf->sf_crcount == 0) {
 542                         if (psf_prev)
 543                                 psf_prev->sf_next = psf->sf_next;
 544                         else
 545                                 *ppsf = psf->sf_next;
 546                         kfree(psf);
 547                 } else
 548                         psf_prev = psf;
 549         }
 550 }
 551
 552 static void igmpv3_send_cr(struct in_device *in_dev)
 553 {
 554         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 555         struct sk_buff *skb = NULL;
 556         int type, dtype;
 557
 558         read_lock(&in_dev->mc_list_lock);
 559         spin_lock_bh(&in_dev->mc_tomb_lock);
 560
 561         /* deleted MCA's */
 562         pmc_prev = NULL;
 563         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 564                 pmc_next = pmc->next;
 565                 if (pmc->sfmode == MCAST_INCLUDE) {
 566                         type = IGMPV3_BLOCK_OLD_SOURCES;
 567                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 568                         skb = add_grec(skb, pmc, type, 1, 0);
 569                         skb = add_grec(skb, pmc, dtype, 1, 1);
 570                 }
 571                 if (pmc->crcount) {
 572                         if (pmc->sfmode == MCAST_EXCLUDE) {
 573                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 574                                 skb = add_grec(skb, pmc, type, 1, 0);
 575                         }
 576                         pmc->crcount--;
 577                         if (pmc->crcount == 0) {
 578                                 igmpv3_clear_zeros(&pmc->tomb);
 579                                 igmpv3_clear_zeros(&pmc->sources);
 580                         }
 581                 }
 582                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 583                         if (pmc_prev)
 584                                 pmc_prev->next = pmc_next;
 585                         else
 586                                 in_dev->mc_tomb = pmc_next;
 587                         in_dev_put(pmc->interface);
 588                         kfree(pmc);
 589                 } else
 590                         pmc_prev = pmc;
 591         }
 592         spin_unlock_bh(&in_dev->mc_tomb_lock);
 593
 594         /* change recs */
 595         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 596                 spin_lock_bh(&pmc->lock);
 597                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 598                         type = IGMPV3_BLOCK_OLD_SOURCES;
 599                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 600                 } else {
 601                         type = IGMPV3_ALLOW_NEW_SOURCES;
 602                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 603                 }
 604                 skb = add_grec(skb, pmc, type, 0, 0);
 605                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 606
 607                 /* filter mode changes */
 608                 if (pmc->crcount) {
 609                         if (pmc->sfmode == MCAST_EXCLUDE)
 610                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 611                         else
 612                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 613                         skb = add_grec(skb, pmc, type, 0, 0);
 614                         pmc->crcount--;
 615                 }
 616                 spin_unlock_bh(&pmc->lock);
 617         }
 618         read_unlock(&in_dev->mc_list_lock);
 619
 620         if (!skb)
 621                 return;
 622         (void) igmpv3_sendpack(skb);
 623 }
 624
 625 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 626         int type)
 627 {
 628         struct sk_buff *skb;
 629         struct iphdr *iph;
 630         struct igmphdr *ih;
 631         struct rtable *rt;
 632         struct net_device *dev = in_dev->dev;
 633         struct net *net = dev_net(dev);
 634         __be32  group = pmc ? pmc->multiaddr : 0;
 635         __be32  dst;
 636
 637         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 638                 return igmpv3_send_report(in_dev, pmc);
 639         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 640                 dst = IGMP_ALL_ROUTER;
 641         else
 642                 dst = group;
 643
 644         {
 645                 struct flowi fl = { .oif = dev->ifindex,
 646                                     .nl_u = { .ip4_u = { .daddr = dst } },
 647                                     .proto = IPPROTO_IGMP };
 648                 if (ip_route_output_key(net, &rt, &fl))
 649                         return -1;
 650         }
 651         if (rt->rt_src == 0) {
 652                 ip_rt_put(rt);
 653                 return -1;
 654         }
 655
 656         skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 657         if (skb == NULL) {
 658                 ip_rt_put(rt);
 659                 return -1;
 660         }
 661
 662         skb->dst = &rt->u.dst;
 663
 664         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 665
 666         skb_reset_network_header(skb);
 667         iph = ip_hdr(skb);
 668         skb_put(skb, sizeof(struct iphdr) + 4);
 669
 670         iph->version  = 4;
 671         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 672         iph->tos      = 0xc0;
 673         iph->frag_off = htons(IP_DF);
 674         iph->ttl      = 1;
 675         iph->daddr    = dst;
 676         iph->saddr    = rt->rt_src;
 677         iph->protocol = IPPROTO_IGMP;
 678         ip_select_ident(iph, &rt->u.dst, NULL);
 679         ((u8*)&iph[1])[0] = IPOPT_RA;
 680         ((u8*)&iph[1])[1] = 4;
 681         ((u8*)&iph[1])[2] = 0;
 682         ((u8*)&iph[1])[3] = 0;
 683
 684         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 685         ih->type = type;
 686         ih->code = 0;
 687         ih->csum = 0;
 688         ih->group = group;
 689         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 690
 691         return ip_local_out(skb);
 692 }
 693
 694 static void igmp_gq_timer_expire(unsigned long data)
 695 {
 696         struct in_device *in_dev = (struct in_device *)data;
 697
 698         in_dev->mr_gq_running = 0;
 699         igmpv3_send_report(in_dev, NULL);
 700         __in_dev_put(in_dev);
 701 }
 702
 703 static void igmp_ifc_timer_expire(unsigned long data)
 704 {
 705         struct in_device *in_dev = (struct in_device *)data;
 706
 707         igmpv3_send_cr(in_dev);
 708         if (in_dev->mr_ifc_count) {
 709                 in_dev->mr_ifc_count--;
 710                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 711         }
 712         __in_dev_put(in_dev);
 713 }
 714
 715 static void igmp_ifc_event(struct in_device *in_dev)
 716 {
 717         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 718                 return;
 719         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 720                 IGMP_Unsolicited_Report_Count;
 721         igmp_ifc_start_timer(in_dev, 1);
 722 }
 723
 724
 725 static void igmp_timer_expire(unsigned long data)
 726 {
 727         struct ip_mc_list *im=(struct ip_mc_list *)data;
 728         struct in_device *in_dev = im->interface;
 729
 730         spin_lock(&im->lock);
 731         im->tm_running = 0;
 732
 733         if (im->unsolicit_count) {
 734                 im->unsolicit_count--;
 735                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 736         }
 737         im->reporter = 1;
 738         spin_unlock(&im->lock);
 739
 740         if (IGMP_V1_SEEN(in_dev))
 741                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 742         else if (IGMP_V2_SEEN(in_dev))
 743                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 744         else
 745                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 746
 747         ip_ma_put(im);
 748 }
 749
 750 /* mark EXCLUDE-mode sources */
 751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 752 {
 753         struct ip_sf_list *psf;
 754         int i, scount;
 755
 756         scount = 0;
 757         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 758                 if (scount == nsrcs)
 759                         break;
 760                 for (i=0; i<nsrcs; i++) {
 761                         /* skip inactive filters */
 762                         if (pmc->sfcount[MCAST_INCLUDE] ||
 763                             pmc->sfcount[MCAST_EXCLUDE] !=
 764                             psf->sf_count[MCAST_EXCLUDE])
 765                                 continue;
 766                         if (srcs[i] == psf->sf_inaddr) {
 767                                 scount++;
 768                                 break;
 769                         }
 770                 }
 771         }
 772         pmc->gsquery = 0;
 773         if (scount == nsrcs)    /* all sources excluded */
 774                 return 0;
 775         return 1;
 776 }
 777
 778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 779 {
 780         struct ip_sf_list *psf;
 781         int i, scount;
 782
 783         if (pmc->sfmode == MCAST_EXCLUDE)
 784                 return igmp_xmarksources(pmc, nsrcs, srcs);
 785
 786         /* mark INCLUDE-mode sources */
 787         scount = 0;
 788         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 789                 if (scount == nsrcs)
 790                         break;
 791                 for (i=0; i<nsrcs; i++)
 792                         if (srcs[i] == psf->sf_inaddr) {
 793                                 psf->sf_gsresp = 1;
 794                                 scount++;
 795                                 break;
 796                         }
 797         }
 798         if (!scount) {
 799                 pmc->gsquery = 0;
 800                 return 0;
 801         }
 802         pmc->gsquery = 1;
 803         return 1;
 804 }
 805
 806 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 807 {
 808         struct ip_mc_list *im;
 809
 810         /* Timers are only set for non-local groups */
 811
 812         if (group == IGMP_ALL_HOSTS)
 813                 return;
 814
 815         read_lock(&in_dev->mc_list_lock);
 816         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 817                 if (im->multiaddr == group) {
 818                         igmp_stop_timer(im);
 819                         break;
 820                 }
 821         }
 822         read_unlock(&in_dev->mc_list_lock);
 823 }
 824
 825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 826         int len)
 827 {
 828         struct igmphdr          *ih = igmp_hdr(skb);
 829         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 830         struct ip_mc_list       *im;
 831         __be32                  group = ih->group;
 832         int                     max_delay;
 833         int                     mark = 0;
 834
 835
 836         if (len == 8) {
 837                 if (ih->code == 0) {
 838                         /* Alas, old v1 router presents here. */
 839
 840                         max_delay = IGMP_Query_Response_Interval;
 841                         in_dev->mr_v1_seen = jiffies +
 842                                 IGMP_V1_Router_Present_Timeout;
 843                         group = 0;
 844                 } else {
 845                         /* v2 router present */
 846                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 847                         in_dev->mr_v2_seen = jiffies +
 848                                 IGMP_V2_Router_Present_Timeout;
 849                 }
 850                 /* cancel the interface change timer */
 851                 in_dev->mr_ifc_count = 0;
 852                 if (del_timer(&in_dev->mr_ifc_timer))
 853                         __in_dev_put(in_dev);
 854                 /* clear deleted report items */
 855                 igmpv3_clear_delrec(in_dev);
 856         } else if (len < 12) {
 857                 return; /* ignore bogus packet; freed by caller */
 858         } else { /* v3 */
 859                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 860                         return;
 861
 862                 ih3 = igmpv3_query_hdr(skb);
 863                 if (ih3->nsrcs) {
 864                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 865                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 866                                 return;
 867                         ih3 = igmpv3_query_hdr(skb);
 868                 }
 869
 870                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 871                 if (!max_delay)
 872                         max_delay = 1;  /* can't mod w/ 0 */
 873                 in_dev->mr_maxdelay = max_delay;
 874                 if (ih3->qrv)
 875                         in_dev->mr_qrv = ih3->qrv;
 876                 if (!group) { /* general query */
 877                         if (ih3->nsrcs)
 878                                 return; /* no sources allowed */
 879                         igmp_gq_start_timer(in_dev);
 880                         return;
 881                 }
 882                 /* mark sources to include, if group & source-specific */
 883                 mark = ih3->nsrcs != 0;
 884         }
 885
 886         /*
 887          * - Start the timers in all of our membership records
 888          *   that the query applies to for the interface on
 889          *   which the query arrived excl. those that belong
 890          *   to a "local" group (224.0.0.X)
 891          * - For timers already running check if they need to
 892          *   be reset.
 893          * - Use the igmp->igmp_code field as the maximum
 894          *   delay possible
 895          */
 896         read_lock(&in_dev->mc_list_lock);
 897         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 898                 int changed;
 899
 900                 if (group && group != im->multiaddr)
 901                         continue;
 902                 if (im->multiaddr == IGMP_ALL_HOSTS)
 903                         continue;
 904                 spin_lock_bh(&im->lock);
 905                 if (im->tm_running)
 906                         im->gsquery = im->gsquery && mark;
 907                 else
 908                         im->gsquery = mark;
 909                 changed = !im->gsquery ||
 910                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 911                 spin_unlock_bh(&im->lock);
 912                 if (changed)
 913                         igmp_mod_timer(im, max_delay);
 914         }
 915         read_unlock(&in_dev->mc_list_lock);
 916 }
 917
 918 int igmp_rcv(struct sk_buff *skb)
 919 {
 920         /* This basically follows the spec line by line -- see RFC1112 */
 921         struct igmphdr *ih;
 922         struct in_device *in_dev = in_dev_get(skb->dev);
 923         int len = skb->len;
 924
 925         if (in_dev == NULL)
 926                 goto drop;
 927
 928         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 929                 goto drop_ref;
 930
 931         switch (skb->ip_summed) {
 932         case CHECKSUM_COMPLETE:
 933                 if (!csum_fold(skb->csum))
 934                         break;
 935                 /* fall through */
 936         case CHECKSUM_NONE:
 937                 skb->csum = 0;
 938                 if (__skb_checksum_complete(skb))
 939                         goto drop_ref;
 940         }
 941
 942         ih = igmp_hdr(skb);
 943         switch (ih->type) {
 944         case IGMP_HOST_MEMBERSHIP_QUERY:
 945                 igmp_heard_query(in_dev, skb, len);
 946                 break;
 947         case IGMP_HOST_MEMBERSHIP_REPORT:
 948         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 949         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 950                 /* Is it our report looped back? */
 951                 if (skb->rtable->fl.iif == 0)
 952                         break;
 953                 /* don't rely on MC router hearing unicast reports */
 954                 if (skb->pkt_type == PACKET_MULTICAST ||
 955                     skb->pkt_type == PACKET_BROADCAST)
 956                         igmp_heard_report(in_dev, ih->group);
 957                 break;
 958         case IGMP_PIM:
 959 #ifdef CONFIG_IP_PIMSM_V1
 960                 in_dev_put(in_dev);
 961                 return pim_rcv_v1(skb);
 962 #endif
 963         case IGMP_DVMRP:
 964         case IGMP_TRACE:
 965         case IGMP_HOST_LEAVE_MESSAGE:
 966         case IGMP_MTRACE:
 967         case IGMP_MTRACE_RESP:
 968                 break;
 969         default:
 970                 break;
 971         }
 972
 973 drop_ref:
 974         in_dev_put(in_dev);
 975 drop:
 976         kfree_skb(skb);
 977         return 0;
 978 }
 979
 980 #endif
 981
 982
 983 /*
 984  *      Add a filter to a device
 985  */
 986
 987 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 988 {
 989         char buf[MAX_ADDR_LEN];
 990         struct net_device *dev = in_dev->dev;
 991
 992         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 993            We will get multicast token leakage, when IFF_MULTICAST
 994            is changed. This check should be done in dev->set_multicast_list
 995            routine. Something sort of:
 996            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 997            --ANK
 998            */
 999         if (arp_mc_map(addr, buf, dev, 0) == 0)
1000                 dev_mc_add(dev, buf, dev->addr_len, 0);
1001 }
1002
1003 /*
1004  *      Remove a filter from a device
1005  */
1006
1007 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1008 {
1009         char buf[MAX_ADDR_LEN];
1010         struct net_device *dev = in_dev->dev;
1011
1012         if (arp_mc_map(addr, buf, dev, 0) == 0)
1013                 dev_mc_delete(dev, buf, dev->addr_len, 0);
1014 }
1015
1016 #ifdef CONFIG_IP_MULTICAST
1017 /*
1018  * deleted ip_mc_list manipulation
1019  */
1020 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1021 {
1022         struct ip_mc_list *pmc;
1023
1024         /* this is an "ip_mc_list" for convenience; only the fields below
1025          * are actually used. In particular, the refcnt and users are not
1026          * used for management of the delete list. Using the same structure
1027          * for deleted items allows change reports to use common code with
1028          * non-deleted or query-response MCA's.
1029          */
1030         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1031         if (!pmc)
1032                 return;
1033         spin_lock_bh(&im->lock);
1034         pmc->interface = im->interface;
1035         in_dev_hold(in_dev);
1036         pmc->multiaddr = im->multiaddr;
1037         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1038                 IGMP_Unsolicited_Report_Count;
1039         pmc->sfmode = im->sfmode;
1040         if (pmc->sfmode == MCAST_INCLUDE) {
1041                 struct ip_sf_list *psf;
1042
1043                 pmc->tomb = im->tomb;
1044                 pmc->sources = im->sources;
1045                 im->tomb = im->sources = NULL;
1046                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1047                         psf->sf_crcount = pmc->crcount;
1048         }
1049         spin_unlock_bh(&im->lock);
1050
1051         spin_lock_bh(&in_dev->mc_tomb_lock);
1052         pmc->next = in_dev->mc_tomb;
1053         in_dev->mc_tomb = pmc;
1054         spin_unlock_bh(&in_dev->mc_tomb_lock);
1055 }
1056
1057 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1058 {
1059         struct ip_mc_list *pmc, *pmc_prev;
1060         struct ip_sf_list *psf, *psf_next;
1061
1062         spin_lock_bh(&in_dev->mc_tomb_lock);
1063         pmc_prev = NULL;
1064         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1065                 if (pmc->multiaddr == multiaddr)
1066                         break;
1067                 pmc_prev = pmc;
1068         }
1069         if (pmc) {
1070                 if (pmc_prev)
1071                         pmc_prev->next = pmc->next;
1072                 else
1073                         in_dev->mc_tomb = pmc->next;
1074         }
1075         spin_unlock_bh(&in_dev->mc_tomb_lock);
1076         if (pmc) {
1077                 for (psf=pmc->tomb; psf; psf=psf_next) {
1078                         psf_next = psf->sf_next;
1079                         kfree(psf);
1080                 }
1081                 in_dev_put(pmc->interface);
1082                 kfree(pmc);
1083         }
1084 }
1085
1086 static void igmpv3_clear_delrec(struct in_device *in_dev)
1087 {
1088         struct ip_mc_list *pmc, *nextpmc;
1089
1090         spin_lock_bh(&in_dev->mc_tomb_lock);
1091         pmc = in_dev->mc_tomb;
1092         in_dev->mc_tomb = NULL;
1093         spin_unlock_bh(&in_dev->mc_tomb_lock);
1094
1095         for (; pmc; pmc = nextpmc) {
1096                 nextpmc = pmc->next;
1097                 ip_mc_clear_src(pmc);
1098                 in_dev_put(pmc->interface);
1099                 kfree(pmc);
1100         }
1101         /* clear dead sources, too */
1102         read_lock(&in_dev->mc_list_lock);
1103         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1104                 struct ip_sf_list *psf, *psf_next;
1105
1106                 spin_lock_bh(&pmc->lock);
1107                 psf = pmc->tomb;
1108                 pmc->tomb = NULL;
1109                 spin_unlock_bh(&pmc->lock);
1110                 for (; psf; psf=psf_next) {
1111                         psf_next = psf->sf_next;
1112                         kfree(psf);
1113                 }
1114         }
1115         read_unlock(&in_dev->mc_list_lock);
1116 }
1117 #endif
1118
1119 static void igmp_group_dropped(struct ip_mc_list *im)
1120 {
1121         struct in_device *in_dev = im->interface;
1122 #ifdef CONFIG_IP_MULTICAST
1123         int reporter;
1124 #endif
1125
1126         if (im->loaded) {
1127                 im->loaded = 0;
1128                 ip_mc_filter_del(in_dev, im->multiaddr);
1129         }
1130
1131 #ifdef CONFIG_IP_MULTICAST
1132         if (im->multiaddr == IGMP_ALL_HOSTS)
1133                 return;
1134
1135         reporter = im->reporter;
1136         igmp_stop_timer(im);
1137
1138         if (!in_dev->dead) {
1139                 if (IGMP_V1_SEEN(in_dev))
1140                         goto done;
1141                 if (IGMP_V2_SEEN(in_dev)) {
1142                         if (reporter)
1143                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1144                         goto done;
1145                 }
1146                 /* IGMPv3 */
1147                 igmpv3_add_delrec(in_dev, im);
1148
1149                 igmp_ifc_event(in_dev);
1150         }
1151 done:
1152 #endif
1153         ip_mc_clear_src(im);
1154 }
1155
1156 static void igmp_group_added(struct ip_mc_list *im)
1157 {
1158         struct in_device *in_dev = im->interface;
1159
1160         if (im->loaded == 0) {
1161                 im->loaded = 1;
1162                 ip_mc_filter_add(in_dev, im->multiaddr);
1163         }
1164
1165 #ifdef CONFIG_IP_MULTICAST
1166         if (im->multiaddr == IGMP_ALL_HOSTS)
1167                 return;
1168
1169         if (in_dev->dead)
1170                 return;
1171         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1172                 spin_lock_bh(&im->lock);
1173                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1174                 spin_unlock_bh(&im->lock);
1175                 return;
1176         }
1177         /* else, v3 */
1178
1179         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1180                 IGMP_Unsolicited_Report_Count;
1181         igmp_ifc_event(in_dev);
1182 #endif
1183 }
1184
1185
1186 /*
1187  *      Multicast list managers
1188  */
1189
1190
1191 /*
1192  *      A socket has joined a multicast group on device dev.
1193  */
1194
1195 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1196 {
1197         struct ip_mc_list *im;
1198
1199         ASSERT_RTNL();
1200
1201         for (im=in_dev->mc_list; im; im=im->next) {
1202                 if (im->multiaddr == addr) {
1203                         im->users++;
1204                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1205                         goto out;
1206                 }
1207         }
1208
1209         im = kmalloc(sizeof(*im), GFP_KERNEL);
1210         if (!im)
1211                 goto out;
1212
1213         im->users = 1;
1214         im->interface = in_dev;
1215         in_dev_hold(in_dev);
1216         im->multiaddr = addr;
1217         /* initial mode is (EX, empty) */
1218         im->sfmode = MCAST_EXCLUDE;
1219         im->sfcount[MCAST_INCLUDE] = 0;
1220         im->sfcount[MCAST_EXCLUDE] = 1;
1221         im->sources = NULL;
1222         im->tomb = NULL;
1223         im->crcount = 0;
1224         atomic_set(&im->refcnt, 1);
1225         spin_lock_init(&im->lock);
1226 #ifdef CONFIG_IP_MULTICAST
1227         im->tm_running = 0;
1228         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1229         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1230         im->reporter = 0;
1231         im->gsquery = 0;
1232 #endif
1233         im->loaded = 0;
1234         write_lock_bh(&in_dev->mc_list_lock);
1235         im->next = in_dev->mc_list;
1236         in_dev->mc_list = im;
1237         in_dev->mc_count++;
1238         write_unlock_bh(&in_dev->mc_list_lock);
1239 #ifdef CONFIG_IP_MULTICAST
1240         igmpv3_del_delrec(in_dev, im->multiaddr);
1241 #endif
1242         igmp_group_added(im);
1243         if (!in_dev->dead)
1244                 ip_rt_multicast_event(in_dev);
1245 out:
1246         return;
1247 }
1248
1249 /*
1250  *      Resend IGMP JOIN report; used for bonding.
1251  */
1252 void ip_mc_rejoin_group(struct ip_mc_list *im)
1253 {
1254 #ifdef CONFIG_IP_MULTICAST
1255         struct in_device *in_dev = im->interface;
1256
1257         if (im->multiaddr == IGMP_ALL_HOSTS)
1258                 return;
1259
1260         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1261                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1262                 return;
1263         }
1264         /* else, v3 */
1265         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1266                 IGMP_Unsolicited_Report_Count;
1267         igmp_ifc_event(in_dev);
1268 #endif
1269 }
1270
1271 /*
1272  *      A socket has left a multicast group on device dev
1273  */
1274
1275 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1276 {
1277         struct ip_mc_list *i, **ip;
1278
1279         ASSERT_RTNL();
1280
1281         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1282                 if (i->multiaddr == addr) {
1283                         if (--i->users == 0) {
1284                                 write_lock_bh(&in_dev->mc_list_lock);
1285                                 *ip = i->next;
1286                                 in_dev->mc_count--;
1287                                 write_unlock_bh(&in_dev->mc_list_lock);
1288                                 igmp_group_dropped(i);
1289
1290                                 if (!in_dev->dead)
1291                                         ip_rt_multicast_event(in_dev);
1292
1293                                 ip_ma_put(i);
1294                                 return;
1295                         }
1296                         break;
1297                 }
1298         }
1299 }
1300
1301 /* Device going down */
1302
1303 void ip_mc_down(struct in_device *in_dev)
1304 {
1305         struct ip_mc_list *i;
1306
1307         ASSERT_RTNL();
1308
1309         for (i=in_dev->mc_list; i; i=i->next)
1310                 igmp_group_dropped(i);
1311
1312 #ifdef CONFIG_IP_MULTICAST
1313         in_dev->mr_ifc_count = 0;
1314         if (del_timer(&in_dev->mr_ifc_timer))
1315                 __in_dev_put(in_dev);
1316         in_dev->mr_gq_running = 0;
1317         if (del_timer(&in_dev->mr_gq_timer))
1318                 __in_dev_put(in_dev);
1319         igmpv3_clear_delrec(in_dev);
1320 #endif
1321
1322         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1323 }
1324
1325 void ip_mc_init_dev(struct in_device *in_dev)
1326 {
1327         ASSERT_RTNL();
1328
1329         in_dev->mc_tomb = NULL;
1330 #ifdef CONFIG_IP_MULTICAST
1331         in_dev->mr_gq_running = 0;
1332         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1333                         (unsigned long)in_dev);
1334         in_dev->mr_ifc_count = 0;
1335         in_dev->mc_count     = 0;
1336         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1337                         (unsigned long)in_dev);
1338         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1339 #endif
1340
1341         rwlock_init(&in_dev->mc_list_lock);
1342         spin_lock_init(&in_dev->mc_tomb_lock);
1343 }
1344
1345 /* Device going up */
1346
1347 void ip_mc_up(struct in_device *in_dev)
1348 {
1349         struct ip_mc_list *i;
1350
1351         ASSERT_RTNL();
1352
1353         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1354
1355         for (i=in_dev->mc_list; i; i=i->next)
1356                 igmp_group_added(i);
1357 }
1358
1359 /*
1360  *      Device is about to be destroyed: clean up.
1361  */
1362
1363 void ip_mc_destroy_dev(struct in_device *in_dev)
1364 {
1365         struct ip_mc_list *i;
1366
1367         ASSERT_RTNL();
1368
1369         /* Deactivate timers */
1370         ip_mc_down(in_dev);
1371
1372         write_lock_bh(&in_dev->mc_list_lock);
1373         while ((i = in_dev->mc_list) != NULL) {
1374                 in_dev->mc_list = i->next;
1375                 in_dev->mc_count--;
1376                 write_unlock_bh(&in_dev->mc_list_lock);
1377                 igmp_group_dropped(i);
1378                 ip_ma_put(i);
1379
1380                 write_lock_bh(&in_dev->mc_list_lock);
1381         }
1382         write_unlock_bh(&in_dev->mc_list_lock);
1383 }
1384
1385 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1386 {
1387         struct flowi fl = { .nl_u = { .ip4_u =
1388                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1389         struct rtable *rt;
1390         struct net_device *dev = NULL;
1391         struct in_device *idev = NULL;
1392
1393         if (imr->imr_ifindex) {
1394                 idev = inetdev_by_index(net, imr->imr_ifindex);
1395                 if (idev)
1396                         __in_dev_put(idev);
1397                 return idev;
1398         }
1399         if (imr->imr_address.s_addr) {
1400                 dev = ip_dev_find(net, imr->imr_address.s_addr);
1401                 if (!dev)
1402                         return NULL;
1403                 dev_put(dev);
1404         }
1405
1406         if (!dev && !ip_route_output_key(net, &rt, &fl)) {
1407                 dev = rt->u.dst.dev;
1408                 ip_rt_put(rt);
1409         }
1410         if (dev) {
1411                 imr->imr_ifindex = dev->ifindex;
1412                 idev = __in_dev_get_rtnl(dev);
1413         }
1414         return idev;
1415 }
1416
1417 /*
1418  *      Join a socket to a group
1419  */
1420 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1421 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1422
1423
1424 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1425         __be32 *psfsrc)
1426 {
1427         struct ip_sf_list *psf, *psf_prev;
1428         int rv = 0;
1429
1430         psf_prev = NULL;
1431         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1432                 if (psf->sf_inaddr == *psfsrc)
1433                         break;
1434                 psf_prev = psf;
1435         }
1436         if (!psf || psf->sf_count[sfmode] == 0) {
1437                 /* source filter not found, or count wrong =>  bug */
1438                 return -ESRCH;
1439         }
1440         psf->sf_count[sfmode]--;
1441         if (psf->sf_count[sfmode] == 0) {
1442                 ip_rt_multicast_event(pmc->interface);
1443         }
1444         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1445 #ifdef CONFIG_IP_MULTICAST
1446                 struct in_device *in_dev = pmc->interface;
1447 #endif
1448
1449                 /* no more filters for this source */
1450                 if (psf_prev)
1451                         psf_prev->sf_next = psf->sf_next;
1452                 else
1453                         pmc->sources = psf->sf_next;
1454 #ifdef CONFIG_IP_MULTICAST
1455                 if (psf->sf_oldin &&
1456                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1457                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1458                                 IGMP_Unsolicited_Report_Count;
1459                         psf->sf_next = pmc->tomb;
1460                         pmc->tomb = psf;
1461                         rv = 1;
1462                 } else
1463 #endif
1464                         kfree(psf);
1465         }
1466         return rv;
1467 }
1468
1469 #ifndef CONFIG_IP_MULTICAST
1470 #define igmp_ifc_event(x)       do { } while (0)
1471 #endif
1472
1473 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1474                          int sfcount, __be32 *psfsrc, int delta)
1475 {
1476         struct ip_mc_list *pmc;
1477         int     changerec = 0;
1478         int     i, err;
1479
1480         if (!in_dev)
1481                 return -ENODEV;
1482         read_lock(&in_dev->mc_list_lock);
1483         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1484                 if (*pmca == pmc->multiaddr)
1485                         break;
1486         }
1487         if (!pmc) {
1488                 /* MCA not found?? bug */
1489                 read_unlock(&in_dev->mc_list_lock);
1490                 return -ESRCH;
1491         }
1492         spin_lock_bh(&pmc->lock);
1493         read_unlock(&in_dev->mc_list_lock);
1494 #ifdef CONFIG_IP_MULTICAST
1495         sf_markstate(pmc);
1496 #endif
1497         if (!delta) {
1498                 err = -EINVAL;
1499                 if (!pmc->sfcount[sfmode])
1500                         goto out_unlock;
1501                 pmc->sfcount[sfmode]--;
1502         }
1503         err = 0;
1504         for (i=0; i<sfcount; i++) {
1505                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1506
1507                 changerec |= rv > 0;
1508                 if (!err && rv < 0)
1509                         err = rv;
1510         }
1511         if (pmc->sfmode == MCAST_EXCLUDE &&
1512             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1513             pmc->sfcount[MCAST_INCLUDE]) {
1514 #ifdef CONFIG_IP_MULTICAST
1515                 struct ip_sf_list *psf;
1516 #endif
1517
1518                 /* filter mode change */
1519                 pmc->sfmode = MCAST_INCLUDE;
1520 #ifdef CONFIG_IP_MULTICAST
1521                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1522                         IGMP_Unsolicited_Report_Count;
1523                 in_dev->mr_ifc_count = pmc->crcount;
1524                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1525                         psf->sf_crcount = 0;
1526                 igmp_ifc_event(pmc->interface);
1527         } else if (sf_setstate(pmc) || changerec) {
1528                 igmp_ifc_event(pmc->interface);
1529 #endif
1530         }
1531 out_unlock:
1532         spin_unlock_bh(&pmc->lock);
1533         return err;
1534 }
1535
1536 /*
1537  * Add multicast single-source filter to the interface list
1538  */
1539 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1540         __be32 *psfsrc, int delta)
1541 {
1542         struct ip_sf_list *psf, *psf_prev;
1543
1544         psf_prev = NULL;
1545         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1546                 if (psf->sf_inaddr == *psfsrc)
1547                         break;
1548                 psf_prev = psf;
1549         }
1550         if (!psf) {
1551                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1552                 if (!psf)
1553                         return -ENOBUFS;
1554                 psf->sf_inaddr = *psfsrc;
1555                 if (psf_prev) {
1556                         psf_prev->sf_next = psf;
1557                 } else
1558                         pmc->sources = psf;
1559         }
1560         psf->sf_count[sfmode]++;
1561         if (psf->sf_count[sfmode] == 1) {
1562                 ip_rt_multicast_event(pmc->interface);
1563         }
1564         return 0;
1565 }
1566
1567 #ifdef CONFIG_IP_MULTICAST
1568 static void sf_markstate(struct ip_mc_list *pmc)
1569 {
1570         struct ip_sf_list *psf;
1571         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1572
1573         for (psf=pmc->sources; psf; psf=psf->sf_next)
1574                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1575                         psf->sf_oldin = mca_xcount ==
1576                                 psf->sf_count[MCAST_EXCLUDE] &&
1577                                 !psf->sf_count[MCAST_INCLUDE];
1578                 } else
1579                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1580 }
1581
1582 static int sf_setstate(struct ip_mc_list *pmc)
1583 {
1584         struct ip_sf_list *psf, *dpsf;
1585         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1586         int qrv = pmc->interface->mr_qrv;
1587         int new_in, rv;
1588
1589         rv = 0;
1590         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1591                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1592                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1593                                 !psf->sf_count[MCAST_INCLUDE];
1594                 } else
1595                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1596                 if (new_in) {
1597                         if (!psf->sf_oldin) {
1598                                 struct ip_sf_list *prev = NULL;
1599
1600                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1601                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1602                                                 break;
1603                                         prev = dpsf;
1604                                 }
1605                                 if (dpsf) {
1606                                         if (prev)
1607                                                 prev->sf_next = dpsf->sf_next;
1608                                         else
1609                                                 pmc->tomb = dpsf->sf_next;
1610                                         kfree(dpsf);
1611                                 }
1612                                 psf->sf_crcount = qrv;
1613                                 rv++;
1614                         }
1615                 } else if (psf->sf_oldin) {
1616
1617                         psf->sf_crcount = 0;
1618                         /*
1619                          * add or update "delete" records if an active filter
1620                          * is now inactive
1621                          */
1622                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1623                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1624                                         break;
1625                         if (!dpsf) {
1626                                 dpsf = (struct ip_sf_list *)
1627                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1628                                 if (!dpsf)
1629                                         continue;
1630                                 *dpsf = *psf;
1631                                 /* pmc->lock held by callers */
1632                                 dpsf->sf_next = pmc->tomb;
1633                                 pmc->tomb = dpsf;
1634                         }
1635                         dpsf->sf_crcount = qrv;
1636                         rv++;
1637                 }
1638         }
1639         return rv;
1640 }
1641 #endif
1642
1643 /*
1644  * Add multicast source filter list to the interface list
1645  */
1646 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1647                          int sfcount, __be32 *psfsrc, int delta)
1648 {
1649         struct ip_mc_list *pmc;
1650         int     isexclude;
1651         int     i, err;
1652
1653         if (!in_dev)
1654                 return -ENODEV;
1655         read_lock(&in_dev->mc_list_lock);
1656         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1657                 if (*pmca == pmc->multiaddr)
1658                         break;
1659         }
1660         if (!pmc) {
1661                 /* MCA not found?? bug */
1662                 read_unlock(&in_dev->mc_list_lock);
1663                 return -ESRCH;
1664         }
1665         spin_lock_bh(&pmc->lock);
1666         read_unlock(&in_dev->mc_list_lock);
1667
1668 #ifdef CONFIG_IP_MULTICAST
1669         sf_markstate(pmc);
1670 #endif
1671         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1672         if (!delta)
1673                 pmc->sfcount[sfmode]++;
1674         err = 0;
1675         for (i=0; i<sfcount; i++) {
1676                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1677                 if (err)
1678                         break;
1679         }
1680         if (err) {
1681                 int j;
1682
1683                 pmc->sfcount[sfmode]--;
1684                 for (j=0; j<i; j++)
1685                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1686         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1687 #ifdef CONFIG_IP_MULTICAST
1688                 struct ip_sf_list *psf;
1689                 in_dev = pmc->interface;
1690 #endif
1691
1692                 /* filter mode change */
1693                 if (pmc->sfcount[MCAST_EXCLUDE])
1694                         pmc->sfmode = MCAST_EXCLUDE;
1695                 else if (pmc->sfcount[MCAST_INCLUDE])
1696                         pmc->sfmode = MCAST_INCLUDE;
1697 #ifdef CONFIG_IP_MULTICAST
1698                 /* else no filters; keep old mode for reports */
1699
1700                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1701                         IGMP_Unsolicited_Report_Count;
1702                 in_dev->mr_ifc_count = pmc->crcount;
1703                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1704                         psf->sf_crcount = 0;
1705                 igmp_ifc_event(in_dev);
1706         } else if (sf_setstate(pmc)) {
1707                 igmp_ifc_event(in_dev);
1708 #endif
1709         }
1710         spin_unlock_bh(&pmc->lock);
1711         return err;
1712 }
1713
1714 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1715 {
1716         struct ip_sf_list *psf, *nextpsf;
1717
1718         for (psf=pmc->tomb; psf; psf=nextpsf) {
1719                 nextpsf = psf->sf_next;
1720                 kfree(psf);
1721         }
1722         pmc->tomb = NULL;
1723         for (psf=pmc->sources; psf; psf=nextpsf) {
1724                 nextpsf = psf->sf_next;
1725                 kfree(psf);
1726         }
1727         pmc->sources = NULL;
1728         pmc->sfmode = MCAST_EXCLUDE;
1729         pmc->sfcount[MCAST_INCLUDE] = 0;
1730         pmc->sfcount[MCAST_EXCLUDE] = 1;
1731 }
1732
1733
1734 /*
1735  * Join a multicast group
1736  */
1737 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1738 {
1739         int err;
1740         __be32 addr = imr->imr_multiaddr.s_addr;
1741         struct ip_mc_socklist *iml = NULL, *i;
1742         struct in_device *in_dev;
1743         struct inet_sock *inet = inet_sk(sk);
1744         struct net *net = sock_net(sk);
1745         int ifindex;
1746         int count = 0;
1747
1748         if (!ipv4_is_multicast(addr))
1749                 return -EINVAL;
1750
1751         rtnl_lock();
1752
1753         in_dev = ip_mc_find_dev(net, imr);
1754
1755         if (!in_dev) {
1756                 iml = NULL;
1757                 err = -ENODEV;
1758                 goto done;
1759         }
1760
1761         err = -EADDRINUSE;
1762         ifindex = imr->imr_ifindex;
1763         for (i = inet->mc_list; i; i = i->next) {
1764                 if (i->multi.imr_multiaddr.s_addr == addr &&
1765                     i->multi.imr_ifindex == ifindex)
1766                         goto done;
1767                 count++;
1768         }
1769         err = -ENOBUFS;
1770         if (count >= sysctl_igmp_max_memberships)
1771                 goto done;
1772         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1773         if (iml == NULL)
1774                 goto done;
1775
1776         memcpy(&iml->multi, imr, sizeof(*imr));
1777         iml->next = inet->mc_list;
1778         iml->sflist = NULL;
1779         iml->sfmode = MCAST_EXCLUDE;
1780         inet->mc_list = iml;
1781         ip_mc_inc_group(in_dev, addr);
1782         err = 0;
1783 done:
1784         rtnl_unlock();
1785         return err;
1786 }
1787
1788 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1789                            struct in_device *in_dev)
1790 {
1791         int err;
1792
1793         if (iml->sflist == NULL) {
1794                 /* any-source empty exclude case */
1795                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1796                         iml->sfmode, 0, NULL, 0);
1797         }
1798         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1799                         iml->sfmode, iml->sflist->sl_count,
1800                         iml->sflist->sl_addr, 0);
1801         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1802         iml->sflist = NULL;
1803         return err;
1804 }
1805
1806 /*
1807  *      Ask a socket to leave a group.
1808  */
1809
1810 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1811 {
1812         struct inet_sock *inet = inet_sk(sk);
1813         struct ip_mc_socklist *iml, **imlp;
1814         struct in_device *in_dev;
1815         struct net *net = sock_net(sk);
1816         __be32 group = imr->imr_multiaddr.s_addr;
1817         u32 ifindex;
1818         int ret = -EADDRNOTAVAIL;
1819
1820         rtnl_lock();
1821         in_dev = ip_mc_find_dev(net, imr);
1822         ifindex = imr->imr_ifindex;
1823         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1824                 if (iml->multi.imr_multiaddr.s_addr != group)
1825                         continue;
1826                 if (ifindex) {
1827                         if (iml->multi.imr_ifindex != ifindex)
1828                                 continue;
1829                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1830                                 iml->multi.imr_address.s_addr)
1831                         continue;
1832
1833                 (void) ip_mc_leave_src(sk, iml, in_dev);
1834
1835                 *imlp = iml->next;
1836
1837                 if (in_dev)
1838                         ip_mc_dec_group(in_dev, group);
1839                 rtnl_unlock();
1840                 sock_kfree_s(sk, iml, sizeof(*iml));
1841                 return 0;
1842         }
1843         if (!in_dev)
1844                 ret = -ENODEV;
1845         rtnl_unlock();
1846         return ret;
1847 }
1848
1849 int ip_mc_source(int add, int omode, struct sock *sk, struct
1850         ip_mreq_source *mreqs, int ifindex)
1851 {
1852         int err;
1853         struct ip_mreqn imr;
1854         __be32 addr = mreqs->imr_multiaddr;
1855         struct ip_mc_socklist *pmc;
1856         struct in_device *in_dev = NULL;
1857         struct inet_sock *inet = inet_sk(sk);
1858         struct ip_sf_socklist *psl;
1859         struct net *net = sock_net(sk);
1860         int leavegroup = 0;
1861         int i, j, rv;
1862
1863         if (!ipv4_is_multicast(addr))
1864                 return -EINVAL;
1865
1866         rtnl_lock();
1867
1868         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1869         imr.imr_address.s_addr = mreqs->imr_interface;
1870         imr.imr_ifindex = ifindex;
1871         in_dev = ip_mc_find_dev(net, &imr);
1872
1873         if (!in_dev) {
1874                 err = -ENODEV;
1875                 goto done;
1876         }
1877         err = -EADDRNOTAVAIL;
1878
1879         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1880                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1881                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1882                         break;
1883         }
1884         if (!pmc) {             /* must have a prior join */
1885                 err = -EINVAL;
1886                 goto done;
1887         }
1888         /* if a source filter was set, must be the same mode as before */
1889         if (pmc->sflist) {
1890                 if (pmc->sfmode != omode) {
1891                         err = -EINVAL;
1892                         goto done;
1893                 }
1894         } else if (pmc->sfmode != omode) {
1895                 /* allow mode switches for empty-set filters */
1896                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1897                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1898                         NULL, 0);
1899                 pmc->sfmode = omode;
1900         }
1901
1902         psl = pmc->sflist;
1903         if (!add) {
1904                 if (!psl)
1905                         goto done;      /* err = -EADDRNOTAVAIL */
1906                 rv = !0;
1907                 for (i=0; i<psl->sl_count; i++) {
1908                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1909                                 sizeof(__be32));
1910                         if (rv == 0)
1911                                 break;
1912                 }
1913                 if (rv)         /* source not found */
1914                         goto done;      /* err = -EADDRNOTAVAIL */
1915
1916                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1917                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1918                         leavegroup = 1;
1919                         goto done;
1920                 }
1921
1922                 /* update the interface filter */
1923                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1924                         &mreqs->imr_sourceaddr, 1);
1925
1926                 for (j=i+1; j<psl->sl_count; j++)
1927                         psl->sl_addr[j-1] = psl->sl_addr[j];
1928                 psl->sl_count--;
1929                 err = 0;
1930                 goto done;
1931         }
1932         /* else, add a new source to the filter */
1933
1934         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1935                 err = -ENOBUFS;
1936                 goto done;
1937         }
1938         if (!psl || psl->sl_count == psl->sl_max) {
1939                 struct ip_sf_socklist *newpsl;
1940                 int count = IP_SFBLOCK;
1941
1942                 if (psl)
1943                         count += psl->sl_max;
1944                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1945                 if (!newpsl) {
1946                         err = -ENOBUFS;
1947                         goto done;
1948                 }
1949                 newpsl->sl_max = count;
1950                 newpsl->sl_count = count - IP_SFBLOCK;
1951                 if (psl) {
1952                         for (i=0; i<psl->sl_count; i++)
1953                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1954                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1955                 }
1956                 pmc->sflist = psl = newpsl;
1957         }
1958         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1959         for (i=0; i<psl->sl_count; i++) {
1960                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1961                         sizeof(__be32));
1962                 if (rv == 0)
1963                         break;
1964         }
1965         if (rv == 0)            /* address already there is an error */
1966                 goto done;
1967         for (j=psl->sl_count-1; j>=i; j--)
1968                 psl->sl_addr[j+1] = psl->sl_addr[j];
1969         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1970         psl->sl_count++;
1971         err = 0;
1972         /* update the interface list */
1973         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1974                 &mreqs->imr_sourceaddr, 1);
1975 done:
1976         rtnl_unlock();
1977         if (leavegroup)
1978                 return ip_mc_leave_group(sk, &imr);
1979         return err;
1980 }
1981
1982 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1983 {
1984         int err = 0;
1985         struct ip_mreqn imr;
1986         __be32 addr = msf->imsf_multiaddr;
1987         struct ip_mc_socklist *pmc;
1988         struct in_device *in_dev;
1989         struct inet_sock *inet = inet_sk(sk);
1990         struct ip_sf_socklist *newpsl, *psl;
1991         struct net *net = sock_net(sk);
1992         int leavegroup = 0;
1993
1994         if (!ipv4_is_multicast(addr))
1995                 return -EINVAL;
1996         if (msf->imsf_fmode != MCAST_INCLUDE &&
1997             msf->imsf_fmode != MCAST_EXCLUDE)
1998                 return -EINVAL;
1999
2000         rtnl_lock();
2001
2002         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2003         imr.imr_address.s_addr = msf->imsf_interface;
2004         imr.imr_ifindex = ifindex;
2005         in_dev = ip_mc_find_dev(net, &imr);
2006
2007         if (!in_dev) {
2008                 err = -ENODEV;
2009                 goto done;
2010         }
2011
2012         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2013         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2014                 leavegroup = 1;
2015                 goto done;
2016         }
2017
2018         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2019                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2020                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2021                         break;
2022         }
2023         if (!pmc) {             /* must have a prior join */
2024                 err = -EINVAL;
2025                 goto done;
2026         }
2027         if (msf->imsf_numsrc) {
2028                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2029                                                            GFP_KERNEL);
2030                 if (!newpsl) {
2031                         err = -ENOBUFS;
2032                         goto done;
2033                 }
2034                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2035                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2036                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2037                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2038                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2039                 if (err) {
2040                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2041                         goto done;
2042                 }
2043         } else {
2044                 newpsl = NULL;
2045                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2046                                      msf->imsf_fmode, 0, NULL, 0);
2047         }
2048         psl = pmc->sflist;
2049         if (psl) {
2050                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2051                         psl->sl_count, psl->sl_addr, 0);
2052                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2053         } else
2054                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2055                         0, NULL, 0);
2056         pmc->sflist = newpsl;
2057         pmc->sfmode = msf->imsf_fmode;
2058         err = 0;
2059 done:
2060         rtnl_unlock();
2061         if (leavegroup)
2062                 err = ip_mc_leave_group(sk, &imr);
2063         return err;
2064 }
2065
2066 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2067         struct ip_msfilter __user *optval, int __user *optlen)
2068 {
2069         int err, len, count, copycount;
2070         struct ip_mreqn imr;
2071         __be32 addr = msf->imsf_multiaddr;
2072         struct ip_mc_socklist *pmc;
2073         struct in_device *in_dev;
2074         struct inet_sock *inet = inet_sk(sk);
2075         struct ip_sf_socklist *psl;
2076         struct net *net = sock_net(sk);
2077
2078         if (!ipv4_is_multicast(addr))
2079                 return -EINVAL;
2080
2081         rtnl_lock();
2082
2083         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2084         imr.imr_address.s_addr = msf->imsf_interface;
2085         imr.imr_ifindex = 0;
2086         in_dev = ip_mc_find_dev(net, &imr);
2087
2088         if (!in_dev) {
2089                 err = -ENODEV;
2090                 goto done;
2091         }
2092         err = -EADDRNOTAVAIL;
2093
2094         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2095                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2096                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2097                         break;
2098         }
2099         if (!pmc)               /* must have a prior join */
2100                 goto done;
2101         msf->imsf_fmode = pmc->sfmode;
2102         psl = pmc->sflist;
2103         rtnl_unlock();
2104         if (!psl) {
2105                 len = 0;
2106                 count = 0;
2107         } else {
2108                 count = psl->sl_count;
2109         }
2110         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2111         len = copycount * sizeof(psl->sl_addr[0]);
2112         msf->imsf_numsrc = count;
2113         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2114             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2115                 return -EFAULT;
2116         }
2117         if (len &&
2118             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2119                 return -EFAULT;
2120         return 0;
2121 done:
2122         rtnl_unlock();
2123         return err;
2124 }
2125
2126 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2127         struct group_filter __user *optval, int __user *optlen)
2128 {
2129         int err, i, count, copycount;
2130         struct sockaddr_in *psin;
2131         __be32 addr;
2132         struct ip_mc_socklist *pmc;
2133         struct inet_sock *inet = inet_sk(sk);
2134         struct ip_sf_socklist *psl;
2135
2136         psin = (struct sockaddr_in *)&gsf->gf_group;
2137         if (psin->sin_family != AF_INET)
2138                 return -EINVAL;
2139         addr = psin->sin_addr.s_addr;
2140         if (!ipv4_is_multicast(addr))
2141                 return -EINVAL;
2142
2143         rtnl_lock();
2144
2145         err = -EADDRNOTAVAIL;
2146
2147         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2148                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2149                     pmc->multi.imr_ifindex == gsf->gf_interface)
2150                         break;
2151         }
2152         if (!pmc)               /* must have a prior join */
2153                 goto done;
2154         gsf->gf_fmode = pmc->sfmode;
2155         psl = pmc->sflist;
2156         rtnl_unlock();
2157         count = psl ? psl->sl_count : 0;
2158         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2159         gsf->gf_numsrc = count;
2160         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2161             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2162                 return -EFAULT;
2163         }
2164         for (i=0; i<copycount; i++) {
2165                 struct sockaddr_storage ss;
2166
2167                 psin = (struct sockaddr_in *)&ss;
2168                 memset(&ss, 0, sizeof(ss));
2169                 psin->sin_family = AF_INET;
2170                 psin->sin_addr.s_addr = psl->sl_addr[i];
2171                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2172                         return -EFAULT;
2173         }
2174         return 0;
2175 done:
2176         rtnl_unlock();
2177         return err;
2178 }
2179
2180 /*
2181  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2182  */
2183 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2184 {
2185         struct inet_sock *inet = inet_sk(sk);
2186         struct ip_mc_socklist *pmc;
2187         struct ip_sf_socklist *psl;
2188         int i;
2189
2190         if (!ipv4_is_multicast(loc_addr))
2191                 return 1;
2192
2193         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2194                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2195                     pmc->multi.imr_ifindex == dif)
2196                         break;
2197         }
2198         if (!pmc)
2199                 return 1;
2200         psl = pmc->sflist;
2201         if (!psl)
2202                 return pmc->sfmode == MCAST_EXCLUDE;
2203
2204         for (i=0; i<psl->sl_count; i++) {
2205                 if (psl->sl_addr[i] == rmt_addr)
2206                         break;
2207         }
2208         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2209                 return 0;
2210         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2211                 return 0;
2212         return 1;
2213 }
2214
2215 /*
2216  *      A socket is closing.
2217  */
2218
2219 void ip_mc_drop_socket(struct sock *sk)
2220 {
2221         struct inet_sock *inet = inet_sk(sk);
2222         struct ip_mc_socklist *iml;
2223         struct net *net = sock_net(sk);
2224
2225         if (inet->mc_list == NULL)
2226                 return;
2227
2228         rtnl_lock();
2229         while ((iml = inet->mc_list) != NULL) {
2230                 struct in_device *in_dev;
2231                 inet->mc_list = iml->next;
2232
2233                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2234                 (void) ip_mc_leave_src(sk, iml, in_dev);
2235                 if (in_dev != NULL) {
2236                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2237                         in_dev_put(in_dev);
2238                 }
2239                 sock_kfree_s(sk, iml, sizeof(*iml));
2240         }
2241         rtnl_unlock();
2242 }
2243
2244 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2245 {
2246         struct ip_mc_list *im;
2247         struct ip_sf_list *psf;
2248         int rv = 0;
2249
2250         read_lock(&in_dev->mc_list_lock);
2251         for (im=in_dev->mc_list; im; im=im->next) {
2252                 if (im->multiaddr == mc_addr)
2253                         break;
2254         }
2255         if (im && proto == IPPROTO_IGMP) {
2256                 rv = 1;
2257         } else if (im) {
2258                 if (src_addr) {
2259                         for (psf=im->sources; psf; psf=psf->sf_next) {
2260                                 if (psf->sf_inaddr == src_addr)
2261                                         break;
2262                         }
2263                         if (psf)
2264                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2265                                         psf->sf_count[MCAST_EXCLUDE] !=
2266                                         im->sfcount[MCAST_EXCLUDE];
2267                         else
2268                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2269                 } else
2270                         rv = 1; /* unspecified source; tentatively allow */
2271         }
2272         read_unlock(&in_dev->mc_list_lock);
2273         return rv;
2274 }
2275
2276 #if defined(CONFIG_PROC_FS)
2277 struct igmp_mc_iter_state {
2278         struct seq_net_private p;
2279         struct net_device *dev;
2280         struct in_device *in_dev;
2281 };
2282
2283 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2284
2285 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2286 {
2287         struct net *net = seq_file_net(seq);
2288         struct ip_mc_list *im = NULL;
2289         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2290
2291         state->in_dev = NULL;
2292         for_each_netdev(net, state->dev) {
2293                 struct in_device *in_dev;
2294                 in_dev = in_dev_get(state->dev);
2295                 if (!in_dev)
2296                         continue;
2297                 read_lock(&in_dev->mc_list_lock);
2298                 im = in_dev->mc_list;
2299                 if (im) {
2300                         state->in_dev = in_dev;
2301                         break;
2302                 }
2303                 read_unlock(&in_dev->mc_list_lock);
2304                 in_dev_put(in_dev);
2305         }
2306         return im;
2307 }
2308
2309 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2310 {
2311         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2312         im = im->next;
2313         while (!im) {
2314                 if (likely(state->in_dev != NULL)) {
2315                         read_unlock(&state->in_dev->mc_list_lock);
2316                         in_dev_put(state->in_dev);
2317                 }
2318                 state->dev = next_net_device(state->dev);
2319                 if (!state->dev) {
2320                         state->in_dev = NULL;
2321                         break;
2322                 }
2323                 state->in_dev = in_dev_get(state->dev);
2324                 if (!state->in_dev)
2325                         continue;
2326                 read_lock(&state->in_dev->mc_list_lock);
2327                 im = state->in_dev->mc_list;
2328         }
2329         return im;
2330 }
2331
2332 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2333 {
2334         struct ip_mc_list *im = igmp_mc_get_first(seq);
2335         if (im)
2336                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2337                         --pos;
2338         return pos ? NULL : im;
2339 }
2340
2341 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2342         __acquires(dev_base_lock)
2343 {
2344         read_lock(&dev_base_lock);
2345         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2346 }
2347
2348 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2349 {
2350         struct ip_mc_list *im;
2351         if (v == SEQ_START_TOKEN)
2352                 im = igmp_mc_get_first(seq);
2353         else
2354                 im = igmp_mc_get_next(seq, v);
2355         ++*pos;
2356         return im;
2357 }
2358
2359 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2360         __releases(dev_base_lock)
2361 {
2362         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2363         if (likely(state->in_dev != NULL)) {
2364                 read_unlock(&state->in_dev->mc_list_lock);
2365                 in_dev_put(state->in_dev);
2366                 state->in_dev = NULL;
2367         }
2368         state->dev = NULL;
2369         read_unlock(&dev_base_lock);
2370 }
2371
2372 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2373 {
2374         if (v == SEQ_START_TOKEN)
2375                 seq_puts(seq,
2376                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2377         else {
2378                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2379                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2380                 char   *querier;
2381 #ifdef CONFIG_IP_MULTICAST
2382                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2383                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2384                           "V3";
2385 #else
2386                 querier = "NONE";
2387 #endif
2388
2389                 if (state->in_dev->mc_list == im) {
2390                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2391                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2392                 }
2393
2394                 seq_printf(seq,
2395                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2396                            im->multiaddr, im->users,
2397                            im->tm_running, im->tm_running ?
2398                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2399                            im->reporter);
2400         }
2401         return 0;
2402 }
2403
2404 static const struct seq_operations igmp_mc_seq_ops = {
2405         .start  =       igmp_mc_seq_start,
2406         .next   =       igmp_mc_seq_next,
2407         .stop   =       igmp_mc_seq_stop,
2408         .show   =       igmp_mc_seq_show,
2409 };
2410
2411 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2412 {
2413         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2414                         sizeof(struct igmp_mc_iter_state));
2415 }
2416
2417 static const struct file_operations igmp_mc_seq_fops = {
2418         .owner          =       THIS_MODULE,
2419         .open           =       igmp_mc_seq_open,
2420         .read           =       seq_read,
2421         .llseek         =       seq_lseek,
2422         .release        =       seq_release_net,
2423 };
2424
2425 struct igmp_mcf_iter_state {
2426         struct seq_net_private p;
2427         struct net_device *dev;
2428         struct in_device *idev;
2429         struct ip_mc_list *im;
2430 };
2431
2432 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2433
2434 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2435 {
2436         struct net *net = seq_file_net(seq);
2437         struct ip_sf_list *psf = NULL;
2438         struct ip_mc_list *im = NULL;
2439         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2440
2441         state->idev = NULL;
2442         state->im = NULL;
2443         for_each_netdev(net, state->dev) {
2444                 struct in_device *idev;
2445                 idev = in_dev_get(state->dev);
2446                 if (unlikely(idev == NULL))
2447                         continue;
2448                 read_lock(&idev->mc_list_lock);
2449                 im = idev->mc_list;
2450                 if (likely(im != NULL)) {
2451                         spin_lock_bh(&im->lock);
2452                         psf = im->sources;
2453                         if (likely(psf != NULL)) {
2454                                 state->im = im;
2455                                 state->idev = idev;
2456                                 break;
2457                         }
2458                         spin_unlock_bh(&im->lock);
2459                 }
2460                 read_unlock(&idev->mc_list_lock);
2461                 in_dev_put(idev);
2462         }
2463         return psf;
2464 }
2465
2466 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2467 {
2468         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2469
2470         psf = psf->sf_next;
2471         while (!psf) {
2472                 spin_unlock_bh(&state->im->lock);
2473                 state->im = state->im->next;
2474                 while (!state->im) {
2475                         if (likely(state->idev != NULL)) {
2476                                 read_unlock(&state->idev->mc_list_lock);
2477                                 in_dev_put(state->idev);
2478                         }
2479                         state->dev = next_net_device(state->dev);
2480                         if (!state->dev) {
2481                                 state->idev = NULL;
2482                                 goto out;
2483                         }
2484                         state->idev = in_dev_get(state->dev);
2485                         if (!state->idev)
2486                                 continue;
2487                         read_lock(&state->idev->mc_list_lock);
2488                         state->im = state->idev->mc_list;
2489                 }
2490                 if (!state->im)
2491                         break;
2492                 spin_lock_bh(&state->im->lock);
2493                 psf = state->im->sources;
2494         }
2495 out:
2496         return psf;
2497 }
2498
2499 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2500 {
2501         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2502         if (psf)
2503                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2504                         --pos;
2505         return pos ? NULL : psf;
2506 }
2507
2508 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2509 {
2510         read_lock(&dev_base_lock);
2511         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2512 }
2513
2514 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2515 {
2516         struct ip_sf_list *psf;
2517         if (v == SEQ_START_TOKEN)
2518                 psf = igmp_mcf_get_first(seq);
2519         else
2520                 psf = igmp_mcf_get_next(seq, v);
2521         ++*pos;
2522         return psf;
2523 }
2524
2525 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2526 {
2527         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2528         if (likely(state->im != NULL)) {
2529                 spin_unlock_bh(&state->im->lock);
2530                 state->im = NULL;
2531         }
2532         if (likely(state->idev != NULL)) {
2533                 read_unlock(&state->idev->mc_list_lock);
2534                 in_dev_put(state->idev);
2535                 state->idev = NULL;
2536         }
2537         state->dev = NULL;
2538         read_unlock(&dev_base_lock);
2539 }
2540
2541 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2542 {
2543         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2544         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2545
2546         if (v == SEQ_START_TOKEN) {
2547                 seq_printf(seq,
2548                            "%3s %6s "
2549                            "%10s %10s %6s %6s\n", "Idx",
2550                            "Device", "MCA",
2551                            "SRC", "INC", "EXC");
2552         } else {
2553                 seq_printf(seq,
2554                            "%3d %6.6s 0x%08x "
2555                            "0x%08x %6lu %6lu\n",
2556                            state->dev->ifindex, state->dev->name,
2557                            ntohl(state->im->multiaddr),
2558                            ntohl(psf->sf_inaddr),
2559                            psf->sf_count[MCAST_INCLUDE],
2560                            psf->sf_count[MCAST_EXCLUDE]);
2561         }
2562         return 0;
2563 }
2564
2565 static const struct seq_operations igmp_mcf_seq_ops = {
2566         .start  =       igmp_mcf_seq_start,
2567         .next   =       igmp_mcf_seq_next,
2568         .stop   =       igmp_mcf_seq_stop,
2569         .show   =       igmp_mcf_seq_show,
2570 };
2571
2572 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2573 {
2574         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2575                         sizeof(struct igmp_mcf_iter_state));
2576 }
2577
2578 static const struct file_operations igmp_mcf_seq_fops = {
2579         .owner          =       THIS_MODULE,
2580         .open           =       igmp_mcf_seq_open,
2581         .read           =       seq_read,
2582         .llseek         =       seq_lseek,
2583         .release        =       seq_release_net,
2584 };
2585
2586 static int igmp_net_init(struct net *net)
2587 {
2588         struct proc_dir_entry *pde;
2589
2590         pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2591         if (!pde)
2592                 goto out_igmp;
2593         pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2594         if (!pde)
2595                 goto out_mcfilter;
2596         return 0;
2597
2598 out_mcfilter:
2599         proc_net_remove(net, "igmp");
2600 out_igmp:
2601         return -ENOMEM;
2602 }
2603
2604 static void igmp_net_exit(struct net *net)
2605 {
2606         proc_net_remove(net, "mcfilter");
2607         proc_net_remove(net, "igmp");
2608 }
2609
2610 static struct pernet_operations igmp_net_ops = {
2611         .init = igmp_net_init,
2612         .exit = igmp_net_exit,
2613 };
2614
2615 int __init igmp_mc_proc_init(void)
2616 {
2617         return register_pernet_subsys(&igmp_net_ops);
2618 }
2619 #endif
2620
2621 EXPORT_SYMBOL(ip_mc_dec_group);
2622 EXPORT_SYMBOL(ip_mc_inc_group);
2623 EXPORT_SYMBOL(ip_mc_join_group);
2624 EXPORT_SYMBOL(ip_mc_rejoin_group);