net/ipv4/igmp.c

   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Authors:
  12  *              Alan Cox <alan@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_set(skb, &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_set(skb, &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(skb)->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 changing type */
1302
1303 void ip_mc_unmap(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
1313 void ip_mc_remap(struct in_device *in_dev)
1314 {
1315         struct ip_mc_list *i;
1316
1317         ASSERT_RTNL();
1318
1319         for (i = in_dev->mc_list; i; i = i->next)
1320                 igmp_group_added(i);
1321 }
1322
1323 /* Device going down */
1324
1325 void ip_mc_down(struct in_device *in_dev)
1326 {
1327         struct ip_mc_list *i;
1328
1329         ASSERT_RTNL();
1330
1331         for (i=in_dev->mc_list; i; i=i->next)
1332                 igmp_group_dropped(i);
1333
1334 #ifdef CONFIG_IP_MULTICAST
1335         in_dev->mr_ifc_count = 0;
1336         if (del_timer(&in_dev->mr_ifc_timer))
1337                 __in_dev_put(in_dev);
1338         in_dev->mr_gq_running = 0;
1339         if (del_timer(&in_dev->mr_gq_timer))
1340                 __in_dev_put(in_dev);
1341         igmpv3_clear_delrec(in_dev);
1342 #endif
1343
1344         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1345 }
1346
1347 void ip_mc_init_dev(struct in_device *in_dev)
1348 {
1349         ASSERT_RTNL();
1350
1351         in_dev->mc_tomb = NULL;
1352 #ifdef CONFIG_IP_MULTICAST
1353         in_dev->mr_gq_running = 0;
1354         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1355                         (unsigned long)in_dev);
1356         in_dev->mr_ifc_count = 0;
1357         in_dev->mc_count     = 0;
1358         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1359                         (unsigned long)in_dev);
1360         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1361 #endif
1362
1363         rwlock_init(&in_dev->mc_list_lock);
1364         spin_lock_init(&in_dev->mc_tomb_lock);
1365 }
1366
1367 /* Device going up */
1368
1369 void ip_mc_up(struct in_device *in_dev)
1370 {
1371         struct ip_mc_list *i;
1372
1373         ASSERT_RTNL();
1374
1375         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1376
1377         for (i=in_dev->mc_list; i; i=i->next)
1378                 igmp_group_added(i);
1379 }
1380
1381 /*
1382  *      Device is about to be destroyed: clean up.
1383  */
1384
1385 void ip_mc_destroy_dev(struct in_device *in_dev)
1386 {
1387         struct ip_mc_list *i;
1388
1389         ASSERT_RTNL();
1390
1391         /* Deactivate timers */
1392         ip_mc_down(in_dev);
1393
1394         write_lock_bh(&in_dev->mc_list_lock);
1395         while ((i = in_dev->mc_list) != NULL) {
1396                 in_dev->mc_list = i->next;
1397                 in_dev->mc_count--;
1398                 write_unlock_bh(&in_dev->mc_list_lock);
1399                 igmp_group_dropped(i);
1400                 ip_ma_put(i);
1401
1402                 write_lock_bh(&in_dev->mc_list_lock);
1403         }
1404         write_unlock_bh(&in_dev->mc_list_lock);
1405 }
1406
1407 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1408 {
1409         struct flowi fl = { .nl_u = { .ip4_u =
1410                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1411         struct rtable *rt;
1412         struct net_device *dev = NULL;
1413         struct in_device *idev = NULL;
1414
1415         if (imr->imr_ifindex) {
1416                 idev = inetdev_by_index(net, imr->imr_ifindex);
1417                 if (idev)
1418                         __in_dev_put(idev);
1419                 return idev;
1420         }
1421         if (imr->imr_address.s_addr) {
1422                 dev = ip_dev_find(net, imr->imr_address.s_addr);
1423                 if (!dev)
1424                         return NULL;
1425                 dev_put(dev);
1426         }
1427
1428         if (!dev && !ip_route_output_key(net, &rt, &fl)) {
1429                 dev = rt->u.dst.dev;
1430                 ip_rt_put(rt);
1431         }
1432         if (dev) {
1433                 imr->imr_ifindex = dev->ifindex;
1434                 idev = __in_dev_get_rtnl(dev);
1435         }
1436         return idev;
1437 }
1438
1439 /*
1440  *      Join a socket to a group
1441  */
1442 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1443 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1444
1445
1446 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1447         __be32 *psfsrc)
1448 {
1449         struct ip_sf_list *psf, *psf_prev;
1450         int rv = 0;
1451
1452         psf_prev = NULL;
1453         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1454                 if (psf->sf_inaddr == *psfsrc)
1455                         break;
1456                 psf_prev = psf;
1457         }
1458         if (!psf || psf->sf_count[sfmode] == 0) {
1459                 /* source filter not found, or count wrong =>  bug */
1460                 return -ESRCH;
1461         }
1462         psf->sf_count[sfmode]--;
1463         if (psf->sf_count[sfmode] == 0) {
1464                 ip_rt_multicast_event(pmc->interface);
1465         }
1466         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1467 #ifdef CONFIG_IP_MULTICAST
1468                 struct in_device *in_dev = pmc->interface;
1469 #endif
1470
1471                 /* no more filters for this source */
1472                 if (psf_prev)
1473                         psf_prev->sf_next = psf->sf_next;
1474                 else
1475                         pmc->sources = psf->sf_next;
1476 #ifdef CONFIG_IP_MULTICAST
1477                 if (psf->sf_oldin &&
1478                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1479                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1480                                 IGMP_Unsolicited_Report_Count;
1481                         psf->sf_next = pmc->tomb;
1482                         pmc->tomb = psf;
1483                         rv = 1;
1484                 } else
1485 #endif
1486                         kfree(psf);
1487         }
1488         return rv;
1489 }
1490
1491 #ifndef CONFIG_IP_MULTICAST
1492 #define igmp_ifc_event(x)       do { } while (0)
1493 #endif
1494
1495 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1496                          int sfcount, __be32 *psfsrc, int delta)
1497 {
1498         struct ip_mc_list *pmc;
1499         int     changerec = 0;
1500         int     i, err;
1501
1502         if (!in_dev)
1503                 return -ENODEV;
1504         read_lock(&in_dev->mc_list_lock);
1505         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1506                 if (*pmca == pmc->multiaddr)
1507                         break;
1508         }
1509         if (!pmc) {
1510                 /* MCA not found?? bug */
1511                 read_unlock(&in_dev->mc_list_lock);
1512                 return -ESRCH;
1513         }
1514         spin_lock_bh(&pmc->lock);
1515         read_unlock(&in_dev->mc_list_lock);
1516 #ifdef CONFIG_IP_MULTICAST
1517         sf_markstate(pmc);
1518 #endif
1519         if (!delta) {
1520                 err = -EINVAL;
1521                 if (!pmc->sfcount[sfmode])
1522                         goto out_unlock;
1523                 pmc->sfcount[sfmode]--;
1524         }
1525         err = 0;
1526         for (i=0; i<sfcount; i++) {
1527                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1528
1529                 changerec |= rv > 0;
1530                 if (!err && rv < 0)
1531                         err = rv;
1532         }
1533         if (pmc->sfmode == MCAST_EXCLUDE &&
1534             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1535             pmc->sfcount[MCAST_INCLUDE]) {
1536 #ifdef CONFIG_IP_MULTICAST
1537                 struct ip_sf_list *psf;
1538 #endif
1539
1540                 /* filter mode change */
1541                 pmc->sfmode = MCAST_INCLUDE;
1542 #ifdef CONFIG_IP_MULTICAST
1543                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1544                         IGMP_Unsolicited_Report_Count;
1545                 in_dev->mr_ifc_count = pmc->crcount;
1546                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1547                         psf->sf_crcount = 0;
1548                 igmp_ifc_event(pmc->interface);
1549         } else if (sf_setstate(pmc) || changerec) {
1550                 igmp_ifc_event(pmc->interface);
1551 #endif
1552         }
1553 out_unlock:
1554         spin_unlock_bh(&pmc->lock);
1555         return err;
1556 }
1557
1558 /*
1559  * Add multicast single-source filter to the interface list
1560  */
1561 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1562         __be32 *psfsrc, int delta)
1563 {
1564         struct ip_sf_list *psf, *psf_prev;
1565
1566         psf_prev = NULL;
1567         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1568                 if (psf->sf_inaddr == *psfsrc)
1569                         break;
1570                 psf_prev = psf;
1571         }
1572         if (!psf) {
1573                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1574                 if (!psf)
1575                         return -ENOBUFS;
1576                 psf->sf_inaddr = *psfsrc;
1577                 if (psf_prev) {
1578                         psf_prev->sf_next = psf;
1579                 } else
1580                         pmc->sources = psf;
1581         }
1582         psf->sf_count[sfmode]++;
1583         if (psf->sf_count[sfmode] == 1) {
1584                 ip_rt_multicast_event(pmc->interface);
1585         }
1586         return 0;
1587 }
1588
1589 #ifdef CONFIG_IP_MULTICAST
1590 static void sf_markstate(struct ip_mc_list *pmc)
1591 {
1592         struct ip_sf_list *psf;
1593         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1594
1595         for (psf=pmc->sources; psf; psf=psf->sf_next)
1596                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1597                         psf->sf_oldin = mca_xcount ==
1598                                 psf->sf_count[MCAST_EXCLUDE] &&
1599                                 !psf->sf_count[MCAST_INCLUDE];
1600                 } else
1601                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1602 }
1603
1604 static int sf_setstate(struct ip_mc_list *pmc)
1605 {
1606         struct ip_sf_list *psf, *dpsf;
1607         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1608         int qrv = pmc->interface->mr_qrv;
1609         int new_in, rv;
1610
1611         rv = 0;
1612         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1613                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1614                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1615                                 !psf->sf_count[MCAST_INCLUDE];
1616                 } else
1617                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1618                 if (new_in) {
1619                         if (!psf->sf_oldin) {
1620                                 struct ip_sf_list *prev = NULL;
1621
1622                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1623                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1624                                                 break;
1625                                         prev = dpsf;
1626                                 }
1627                                 if (dpsf) {
1628                                         if (prev)
1629                                                 prev->sf_next = dpsf->sf_next;
1630                                         else
1631                                                 pmc->tomb = dpsf->sf_next;
1632                                         kfree(dpsf);
1633                                 }
1634                                 psf->sf_crcount = qrv;
1635                                 rv++;
1636                         }
1637                 } else if (psf->sf_oldin) {
1638
1639                         psf->sf_crcount = 0;
1640                         /*
1641                          * add or update "delete" records if an active filter
1642                          * is now inactive
1643                          */
1644                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1645                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1646                                         break;
1647                         if (!dpsf) {
1648                                 dpsf = (struct ip_sf_list *)
1649                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1650                                 if (!dpsf)
1651                                         continue;
1652                                 *dpsf = *psf;
1653                                 /* pmc->lock held by callers */
1654                                 dpsf->sf_next = pmc->tomb;
1655                                 pmc->tomb = dpsf;
1656                         }
1657                         dpsf->sf_crcount = qrv;
1658                         rv++;
1659                 }
1660         }
1661         return rv;
1662 }
1663 #endif
1664
1665 /*
1666  * Add multicast source filter list to the interface list
1667  */
1668 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1669                          int sfcount, __be32 *psfsrc, int delta)
1670 {
1671         struct ip_mc_list *pmc;
1672         int     isexclude;
1673         int     i, err;
1674
1675         if (!in_dev)
1676                 return -ENODEV;
1677         read_lock(&in_dev->mc_list_lock);
1678         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1679                 if (*pmca == pmc->multiaddr)
1680                         break;
1681         }
1682         if (!pmc) {
1683                 /* MCA not found?? bug */
1684                 read_unlock(&in_dev->mc_list_lock);
1685                 return -ESRCH;
1686         }
1687         spin_lock_bh(&pmc->lock);
1688         read_unlock(&in_dev->mc_list_lock);
1689
1690 #ifdef CONFIG_IP_MULTICAST
1691         sf_markstate(pmc);
1692 #endif
1693         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1694         if (!delta)
1695                 pmc->sfcount[sfmode]++;
1696         err = 0;
1697         for (i=0; i<sfcount; i++) {
1698                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1699                 if (err)
1700                         break;
1701         }
1702         if (err) {
1703                 int j;
1704
1705                 pmc->sfcount[sfmode]--;
1706                 for (j=0; j<i; j++)
1707                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1708         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1709 #ifdef CONFIG_IP_MULTICAST
1710                 struct ip_sf_list *psf;
1711                 in_dev = pmc->interface;
1712 #endif
1713
1714                 /* filter mode change */
1715                 if (pmc->sfcount[MCAST_EXCLUDE])
1716                         pmc->sfmode = MCAST_EXCLUDE;
1717                 else if (pmc->sfcount[MCAST_INCLUDE])
1718                         pmc->sfmode = MCAST_INCLUDE;
1719 #ifdef CONFIG_IP_MULTICAST
1720                 /* else no filters; keep old mode for reports */
1721
1722                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1723                         IGMP_Unsolicited_Report_Count;
1724                 in_dev->mr_ifc_count = pmc->crcount;
1725                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1726                         psf->sf_crcount = 0;
1727                 igmp_ifc_event(in_dev);
1728         } else if (sf_setstate(pmc)) {
1729                 igmp_ifc_event(in_dev);
1730 #endif
1731         }
1732         spin_unlock_bh(&pmc->lock);
1733         return err;
1734 }
1735
1736 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1737 {
1738         struct ip_sf_list *psf, *nextpsf;
1739
1740         for (psf=pmc->tomb; psf; psf=nextpsf) {
1741                 nextpsf = psf->sf_next;
1742                 kfree(psf);
1743         }
1744         pmc->tomb = NULL;
1745         for (psf=pmc->sources; psf; psf=nextpsf) {
1746                 nextpsf = psf->sf_next;
1747                 kfree(psf);
1748         }
1749         pmc->sources = NULL;
1750         pmc->sfmode = MCAST_EXCLUDE;
1751         pmc->sfcount[MCAST_INCLUDE] = 0;
1752         pmc->sfcount[MCAST_EXCLUDE] = 1;
1753 }
1754
1755
1756 /*
1757  * Join a multicast group
1758  */
1759 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1760 {
1761         int err;
1762         __be32 addr = imr->imr_multiaddr.s_addr;
1763         struct ip_mc_socklist *iml = NULL, *i;
1764         struct in_device *in_dev;
1765         struct inet_sock *inet = inet_sk(sk);
1766         struct net *net = sock_net(sk);
1767         int ifindex;
1768         int count = 0;
1769
1770         if (!ipv4_is_multicast(addr))
1771                 return -EINVAL;
1772
1773         rtnl_lock();
1774
1775         in_dev = ip_mc_find_dev(net, imr);
1776
1777         if (!in_dev) {
1778                 iml = NULL;
1779                 err = -ENODEV;
1780                 goto done;
1781         }
1782
1783         err = -EADDRINUSE;
1784         ifindex = imr->imr_ifindex;
1785         for (i = inet->mc_list; i; i = i->next) {
1786                 if (i->multi.imr_multiaddr.s_addr == addr &&
1787                     i->multi.imr_ifindex == ifindex)
1788                         goto done;
1789                 count++;
1790         }
1791         err = -ENOBUFS;
1792         if (count >= sysctl_igmp_max_memberships)
1793                 goto done;
1794         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1795         if (iml == NULL)
1796                 goto done;
1797
1798         memcpy(&iml->multi, imr, sizeof(*imr));
1799         iml->next = inet->mc_list;
1800         iml->sflist = NULL;
1801         iml->sfmode = MCAST_EXCLUDE;
1802         inet->mc_list = iml;
1803         ip_mc_inc_group(in_dev, addr);
1804         err = 0;
1805 done:
1806         rtnl_unlock();
1807         return err;
1808 }
1809
1810 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1811                            struct in_device *in_dev)
1812 {
1813         int err;
1814
1815         if (iml->sflist == NULL) {
1816                 /* any-source empty exclude case */
1817                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1818                         iml->sfmode, 0, NULL, 0);
1819         }
1820         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1821                         iml->sfmode, iml->sflist->sl_count,
1822                         iml->sflist->sl_addr, 0);
1823         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1824         iml->sflist = NULL;
1825         return err;
1826 }
1827
1828 /*
1829  *      Ask a socket to leave a group.
1830  */
1831
1832 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1833 {
1834         struct inet_sock *inet = inet_sk(sk);
1835         struct ip_mc_socklist *iml, **imlp;
1836         struct in_device *in_dev;
1837         struct net *net = sock_net(sk);
1838         __be32 group = imr->imr_multiaddr.s_addr;
1839         u32 ifindex;
1840         int ret = -EADDRNOTAVAIL;
1841
1842         rtnl_lock();
1843         in_dev = ip_mc_find_dev(net, imr);
1844         ifindex = imr->imr_ifindex;
1845         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1846                 if (iml->multi.imr_multiaddr.s_addr != group)
1847                         continue;
1848                 if (ifindex) {
1849                         if (iml->multi.imr_ifindex != ifindex)
1850                                 continue;
1851                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1852                                 iml->multi.imr_address.s_addr)
1853                         continue;
1854
1855                 (void) ip_mc_leave_src(sk, iml, in_dev);
1856
1857                 *imlp = iml->next;
1858
1859                 if (in_dev)
1860                         ip_mc_dec_group(in_dev, group);
1861                 rtnl_unlock();
1862                 sock_kfree_s(sk, iml, sizeof(*iml));
1863                 return 0;
1864         }
1865         if (!in_dev)
1866                 ret = -ENODEV;
1867         rtnl_unlock();
1868         return ret;
1869 }
1870
1871 int ip_mc_source(int add, int omode, struct sock *sk, struct
1872         ip_mreq_source *mreqs, int ifindex)
1873 {
1874         int err;
1875         struct ip_mreqn imr;
1876         __be32 addr = mreqs->imr_multiaddr;
1877         struct ip_mc_socklist *pmc;
1878         struct in_device *in_dev = NULL;
1879         struct inet_sock *inet = inet_sk(sk);
1880         struct ip_sf_socklist *psl;
1881         struct net *net = sock_net(sk);
1882         int leavegroup = 0;
1883         int i, j, rv;
1884
1885         if (!ipv4_is_multicast(addr))
1886                 return -EINVAL;
1887
1888         rtnl_lock();
1889
1890         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1891         imr.imr_address.s_addr = mreqs->imr_interface;
1892         imr.imr_ifindex = ifindex;
1893         in_dev = ip_mc_find_dev(net, &imr);
1894
1895         if (!in_dev) {
1896                 err = -ENODEV;
1897                 goto done;
1898         }
1899         err = -EADDRNOTAVAIL;
1900
1901         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1902                 if ((pmc->multi.imr_multiaddr.s_addr ==
1903                      imr.imr_multiaddr.s_addr) &&
1904                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
1905                         break;
1906         }
1907         if (!pmc) {             /* must have a prior join */
1908                 err = -EINVAL;
1909                 goto done;
1910         }
1911         /* if a source filter was set, must be the same mode as before */
1912         if (pmc->sflist) {
1913                 if (pmc->sfmode != omode) {
1914                         err = -EINVAL;
1915                         goto done;
1916                 }
1917         } else if (pmc->sfmode != omode) {
1918                 /* allow mode switches for empty-set filters */
1919                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1920                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1921                         NULL, 0);
1922                 pmc->sfmode = omode;
1923         }
1924
1925         psl = pmc->sflist;
1926         if (!add) {
1927                 if (!psl)
1928                         goto done;      /* err = -EADDRNOTAVAIL */
1929                 rv = !0;
1930                 for (i=0; i<psl->sl_count; i++) {
1931                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1932                                 sizeof(__be32));
1933                         if (rv == 0)
1934                                 break;
1935                 }
1936                 if (rv)         /* source not found */
1937                         goto done;      /* err = -EADDRNOTAVAIL */
1938
1939                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1940                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1941                         leavegroup = 1;
1942                         goto done;
1943                 }
1944
1945                 /* update the interface filter */
1946                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1947                         &mreqs->imr_sourceaddr, 1);
1948
1949                 for (j=i+1; j<psl->sl_count; j++)
1950                         psl->sl_addr[j-1] = psl->sl_addr[j];
1951                 psl->sl_count--;
1952                 err = 0;
1953                 goto done;
1954         }
1955         /* else, add a new source to the filter */
1956
1957         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1958                 err = -ENOBUFS;
1959                 goto done;
1960         }
1961         if (!psl || psl->sl_count == psl->sl_max) {
1962                 struct ip_sf_socklist *newpsl;
1963                 int count = IP_SFBLOCK;
1964
1965                 if (psl)
1966                         count += psl->sl_max;
1967                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1968                 if (!newpsl) {
1969                         err = -ENOBUFS;
1970                         goto done;
1971                 }
1972                 newpsl->sl_max = count;
1973                 newpsl->sl_count = count - IP_SFBLOCK;
1974                 if (psl) {
1975                         for (i=0; i<psl->sl_count; i++)
1976                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1977                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1978                 }
1979                 pmc->sflist = psl = newpsl;
1980         }
1981         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1982         for (i=0; i<psl->sl_count; i++) {
1983                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1984                         sizeof(__be32));
1985                 if (rv == 0)
1986                         break;
1987         }
1988         if (rv == 0)            /* address already there is an error */
1989                 goto done;
1990         for (j=psl->sl_count-1; j>=i; j--)
1991                 psl->sl_addr[j+1] = psl->sl_addr[j];
1992         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1993         psl->sl_count++;
1994         err = 0;
1995         /* update the interface list */
1996         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1997                 &mreqs->imr_sourceaddr, 1);
1998 done:
1999         rtnl_unlock();
2000         if (leavegroup)
2001                 return ip_mc_leave_group(sk, &imr);
2002         return err;
2003 }
2004
2005 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2006 {
2007         int err = 0;
2008         struct ip_mreqn imr;
2009         __be32 addr = msf->imsf_multiaddr;
2010         struct ip_mc_socklist *pmc;
2011         struct in_device *in_dev;
2012         struct inet_sock *inet = inet_sk(sk);
2013         struct ip_sf_socklist *newpsl, *psl;
2014         struct net *net = sock_net(sk);
2015         int leavegroup = 0;
2016
2017         if (!ipv4_is_multicast(addr))
2018                 return -EINVAL;
2019         if (msf->imsf_fmode != MCAST_INCLUDE &&
2020             msf->imsf_fmode != MCAST_EXCLUDE)
2021                 return -EINVAL;
2022
2023         rtnl_lock();
2024
2025         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2026         imr.imr_address.s_addr = msf->imsf_interface;
2027         imr.imr_ifindex = ifindex;
2028         in_dev = ip_mc_find_dev(net, &imr);
2029
2030         if (!in_dev) {
2031                 err = -ENODEV;
2032                 goto done;
2033         }
2034
2035         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2036         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2037                 leavegroup = 1;
2038                 goto done;
2039         }
2040
2041         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2042                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2043                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2044                         break;
2045         }
2046         if (!pmc) {             /* must have a prior join */
2047                 err = -EINVAL;
2048                 goto done;
2049         }
2050         if (msf->imsf_numsrc) {
2051                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2052                                                            GFP_KERNEL);
2053                 if (!newpsl) {
2054                         err = -ENOBUFS;
2055                         goto done;
2056                 }
2057                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2058                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2059                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2060                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2061                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2062                 if (err) {
2063                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2064                         goto done;
2065                 }
2066         } else {
2067                 newpsl = NULL;
2068                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2069                                      msf->imsf_fmode, 0, NULL, 0);
2070         }
2071         psl = pmc->sflist;
2072         if (psl) {
2073                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2074                         psl->sl_count, psl->sl_addr, 0);
2075                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2076         } else
2077                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2078                         0, NULL, 0);
2079         pmc->sflist = newpsl;
2080         pmc->sfmode = msf->imsf_fmode;
2081         err = 0;
2082 done:
2083         rtnl_unlock();
2084         if (leavegroup)
2085                 err = ip_mc_leave_group(sk, &imr);
2086         return err;
2087 }
2088
2089 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2090         struct ip_msfilter __user *optval, int __user *optlen)
2091 {
2092         int err, len, count, copycount;
2093         struct ip_mreqn imr;
2094         __be32 addr = msf->imsf_multiaddr;
2095         struct ip_mc_socklist *pmc;
2096         struct in_device *in_dev;
2097         struct inet_sock *inet = inet_sk(sk);
2098         struct ip_sf_socklist *psl;
2099         struct net *net = sock_net(sk);
2100
2101         if (!ipv4_is_multicast(addr))
2102                 return -EINVAL;
2103
2104         rtnl_lock();
2105
2106         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2107         imr.imr_address.s_addr = msf->imsf_interface;
2108         imr.imr_ifindex = 0;
2109         in_dev = ip_mc_find_dev(net, &imr);
2110
2111         if (!in_dev) {
2112                 err = -ENODEV;
2113                 goto done;
2114         }
2115         err = -EADDRNOTAVAIL;
2116
2117         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2118                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2119                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2120                         break;
2121         }
2122         if (!pmc)               /* must have a prior join */
2123                 goto done;
2124         msf->imsf_fmode = pmc->sfmode;
2125         psl = pmc->sflist;
2126         rtnl_unlock();
2127         if (!psl) {
2128                 len = 0;
2129                 count = 0;
2130         } else {
2131                 count = psl->sl_count;
2132         }
2133         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2134         len = copycount * sizeof(psl->sl_addr[0]);
2135         msf->imsf_numsrc = count;
2136         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2137             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2138                 return -EFAULT;
2139         }
2140         if (len &&
2141             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2142                 return -EFAULT;
2143         return 0;
2144 done:
2145         rtnl_unlock();
2146         return err;
2147 }
2148
2149 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2150         struct group_filter __user *optval, int __user *optlen)
2151 {
2152         int err, i, count, copycount;
2153         struct sockaddr_in *psin;
2154         __be32 addr;
2155         struct ip_mc_socklist *pmc;
2156         struct inet_sock *inet = inet_sk(sk);
2157         struct ip_sf_socklist *psl;
2158
2159         psin = (struct sockaddr_in *)&gsf->gf_group;
2160         if (psin->sin_family != AF_INET)
2161                 return -EINVAL;
2162         addr = psin->sin_addr.s_addr;
2163         if (!ipv4_is_multicast(addr))
2164                 return -EINVAL;
2165
2166         rtnl_lock();
2167
2168         err = -EADDRNOTAVAIL;
2169
2170         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2171                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2172                     pmc->multi.imr_ifindex == gsf->gf_interface)
2173                         break;
2174         }
2175         if (!pmc)               /* must have a prior join */
2176                 goto done;
2177         gsf->gf_fmode = pmc->sfmode;
2178         psl = pmc->sflist;
2179         rtnl_unlock();
2180         count = psl ? psl->sl_count : 0;
2181         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2182         gsf->gf_numsrc = count;
2183         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2184             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2185                 return -EFAULT;
2186         }
2187         for (i=0; i<copycount; i++) {
2188                 struct sockaddr_storage ss;
2189
2190                 psin = (struct sockaddr_in *)&ss;
2191                 memset(&ss, 0, sizeof(ss));
2192                 psin->sin_family = AF_INET;
2193                 psin->sin_addr.s_addr = psl->sl_addr[i];
2194                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2195                         return -EFAULT;
2196         }
2197         return 0;
2198 done:
2199         rtnl_unlock();
2200         return err;
2201 }
2202
2203 /*
2204  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2205  */
2206 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2207 {
2208         struct inet_sock *inet = inet_sk(sk);
2209         struct ip_mc_socklist *pmc;
2210         struct ip_sf_socklist *psl;
2211         int i;
2212
2213         if (!ipv4_is_multicast(loc_addr))
2214                 return 1;
2215
2216         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2217                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2218                     pmc->multi.imr_ifindex == dif)
2219                         break;
2220         }
2221         if (!pmc)
2222                 return inet->mc_all;
2223         psl = pmc->sflist;
2224         if (!psl)
2225                 return pmc->sfmode == MCAST_EXCLUDE;
2226
2227         for (i=0; i<psl->sl_count; i++) {
2228                 if (psl->sl_addr[i] == rmt_addr)
2229                         break;
2230         }
2231         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2232                 return 0;
2233         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2234                 return 0;
2235         return 1;
2236 }
2237
2238 /*
2239  *      A socket is closing.
2240  */
2241
2242 void ip_mc_drop_socket(struct sock *sk)
2243 {
2244         struct inet_sock *inet = inet_sk(sk);
2245         struct ip_mc_socklist *iml;
2246         struct net *net = sock_net(sk);
2247
2248         if (inet->mc_list == NULL)
2249                 return;
2250
2251         rtnl_lock();
2252         while ((iml = inet->mc_list) != NULL) {
2253                 struct in_device *in_dev;
2254                 inet->mc_list = iml->next;
2255
2256                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2257                 (void) ip_mc_leave_src(sk, iml, in_dev);
2258                 if (in_dev != NULL) {
2259                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2260                         in_dev_put(in_dev);
2261                 }
2262                 sock_kfree_s(sk, iml, sizeof(*iml));
2263         }
2264         rtnl_unlock();
2265 }
2266
2267 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2268 {
2269         struct ip_mc_list *im;
2270         struct ip_sf_list *psf;
2271         int rv = 0;
2272
2273         read_lock(&in_dev->mc_list_lock);
2274         for (im=in_dev->mc_list; im; im=im->next) {
2275                 if (im->multiaddr == mc_addr)
2276                         break;
2277         }
2278         if (im && proto == IPPROTO_IGMP) {
2279                 rv = 1;
2280         } else if (im) {
2281                 if (src_addr) {
2282                         for (psf=im->sources; psf; psf=psf->sf_next) {
2283                                 if (psf->sf_inaddr == src_addr)
2284                                         break;
2285                         }
2286                         if (psf)
2287                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2288                                         psf->sf_count[MCAST_EXCLUDE] !=
2289                                         im->sfcount[MCAST_EXCLUDE];
2290                         else
2291                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2292                 } else
2293                         rv = 1; /* unspecified source; tentatively allow */
2294         }
2295         read_unlock(&in_dev->mc_list_lock);
2296         return rv;
2297 }
2298
2299 #if defined(CONFIG_PROC_FS)
2300 struct igmp_mc_iter_state {
2301         struct seq_net_private p;
2302         struct net_device *dev;
2303         struct in_device *in_dev;
2304 };
2305
2306 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2307
2308 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2309 {
2310         struct net *net = seq_file_net(seq);
2311         struct ip_mc_list *im = NULL;
2312         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2313
2314         state->in_dev = NULL;
2315         for_each_netdev_rcu(net, state->dev) {
2316                 struct in_device *in_dev;
2317
2318                 in_dev = __in_dev_get_rcu(state->dev);
2319                 if (!in_dev)
2320                         continue;
2321                 read_lock(&in_dev->mc_list_lock);
2322                 im = in_dev->mc_list;
2323                 if (im) {
2324                         state->in_dev = in_dev;
2325                         break;
2326                 }
2327                 read_unlock(&in_dev->mc_list_lock);
2328         }
2329         return im;
2330 }
2331
2332 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2333 {
2334         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2335         im = im->next;
2336         while (!im) {
2337                 if (likely(state->in_dev != NULL))
2338                         read_unlock(&state->in_dev->mc_list_lock);
2339
2340                 state->dev = next_net_device_rcu(state->dev);
2341                 if (!state->dev) {
2342                         state->in_dev = NULL;
2343                         break;
2344                 }
2345                 state->in_dev = __in_dev_get_rcu(state->dev);
2346                 if (!state->in_dev)
2347                         continue;
2348                 read_lock(&state->in_dev->mc_list_lock);
2349                 im = state->in_dev->mc_list;
2350         }
2351         return im;
2352 }
2353
2354 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2355 {
2356         struct ip_mc_list *im = igmp_mc_get_first(seq);
2357         if (im)
2358                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2359                         --pos;
2360         return pos ? NULL : im;
2361 }
2362
2363 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2364         __acquires(rcu)
2365 {
2366         rcu_read_lock();
2367         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2368 }
2369
2370 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2371 {
2372         struct ip_mc_list *im;
2373         if (v == SEQ_START_TOKEN)
2374                 im = igmp_mc_get_first(seq);
2375         else
2376                 im = igmp_mc_get_next(seq, v);
2377         ++*pos;
2378         return im;
2379 }
2380
2381 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2382         __releases(rcu)
2383 {
2384         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2385         if (likely(state->in_dev != NULL)) {
2386                 read_unlock(&state->in_dev->mc_list_lock);
2387                 state->in_dev = NULL;
2388         }
2389         state->dev = NULL;
2390         rcu_read_unlock();
2391 }
2392
2393 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2394 {
2395         if (v == SEQ_START_TOKEN)
2396                 seq_puts(seq,
2397                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2398         else {
2399                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2400                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2401                 char   *querier;
2402 #ifdef CONFIG_IP_MULTICAST
2403                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2404                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2405                           "V3";
2406 #else
2407                 querier = "NONE";
2408 #endif
2409
2410                 if (state->in_dev->mc_list == im) {
2411                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2412                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2413                 }
2414
2415                 seq_printf(seq,
2416                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2417                            im->multiaddr, im->users,
2418                            im->tm_running, im->tm_running ?
2419                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2420                            im->reporter);
2421         }
2422         return 0;
2423 }
2424
2425 static const struct seq_operations igmp_mc_seq_ops = {
2426         .start  =       igmp_mc_seq_start,
2427         .next   =       igmp_mc_seq_next,
2428         .stop   =       igmp_mc_seq_stop,
2429         .show   =       igmp_mc_seq_show,
2430 };
2431
2432 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2433 {
2434         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2435                         sizeof(struct igmp_mc_iter_state));
2436 }
2437
2438 static const struct file_operations igmp_mc_seq_fops = {
2439         .owner          =       THIS_MODULE,
2440         .open           =       igmp_mc_seq_open,
2441         .read           =       seq_read,
2442         .llseek         =       seq_lseek,
2443         .release        =       seq_release_net,
2444 };
2445
2446 struct igmp_mcf_iter_state {
2447         struct seq_net_private p;
2448         struct net_device *dev;
2449         struct in_device *idev;
2450         struct ip_mc_list *im;
2451 };
2452
2453 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2454
2455 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2456 {
2457         struct net *net = seq_file_net(seq);
2458         struct ip_sf_list *psf = NULL;
2459         struct ip_mc_list *im = NULL;
2460         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2461
2462         state->idev = NULL;
2463         state->im = NULL;
2464         for_each_netdev_rcu(net, state->dev) {
2465                 struct in_device *idev;
2466                 idev = __in_dev_get_rcu(state->dev);
2467                 if (unlikely(idev == NULL))
2468                         continue;
2469                 read_lock(&idev->mc_list_lock);
2470                 im = idev->mc_list;
2471                 if (likely(im != NULL)) {
2472                         spin_lock_bh(&im->lock);
2473                         psf = im->sources;
2474                         if (likely(psf != NULL)) {
2475                                 state->im = im;
2476                                 state->idev = idev;
2477                                 break;
2478                         }
2479                         spin_unlock_bh(&im->lock);
2480                 }
2481                 read_unlock(&idev->mc_list_lock);
2482         }
2483         return psf;
2484 }
2485
2486 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2487 {
2488         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2489
2490         psf = psf->sf_next;
2491         while (!psf) {
2492                 spin_unlock_bh(&state->im->lock);
2493                 state->im = state->im->next;
2494                 while (!state->im) {
2495                         if (likely(state->idev != NULL))
2496                                 read_unlock(&state->idev->mc_list_lock);
2497
2498                         state->dev = next_net_device_rcu(state->dev);
2499                         if (!state->dev) {
2500                                 state->idev = NULL;
2501                                 goto out;
2502                         }
2503                         state->idev = __in_dev_get_rcu(state->dev);
2504                         if (!state->idev)
2505                                 continue;
2506                         read_lock(&state->idev->mc_list_lock);
2507                         state->im = state->idev->mc_list;
2508                 }
2509                 if (!state->im)
2510                         break;
2511                 spin_lock_bh(&state->im->lock);
2512                 psf = state->im->sources;
2513         }
2514 out:
2515         return psf;
2516 }
2517
2518 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2519 {
2520         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2521         if (psf)
2522                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2523                         --pos;
2524         return pos ? NULL : psf;
2525 }
2526
2527 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2528         __acquires(rcu)
2529 {
2530         rcu_read_lock();
2531         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2532 }
2533
2534 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2535 {
2536         struct ip_sf_list *psf;
2537         if (v == SEQ_START_TOKEN)
2538                 psf = igmp_mcf_get_first(seq);
2539         else
2540                 psf = igmp_mcf_get_next(seq, v);
2541         ++*pos;
2542         return psf;
2543 }
2544
2545 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2546         __releases(rcu)
2547 {
2548         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2549         if (likely(state->im != NULL)) {
2550                 spin_unlock_bh(&state->im->lock);
2551                 state->im = NULL;
2552         }
2553         if (likely(state->idev != NULL)) {
2554                 read_unlock(&state->idev->mc_list_lock);
2555                 state->idev = NULL;
2556         }
2557         state->dev = NULL;
2558         rcu_read_unlock();
2559 }
2560
2561 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2562 {
2563         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2564         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2565
2566         if (v == SEQ_START_TOKEN) {
2567                 seq_printf(seq,
2568                            "%3s %6s "
2569                            "%10s %10s %6s %6s\n", "Idx",
2570                            "Device", "MCA",
2571                            "SRC", "INC", "EXC");
2572         } else {
2573                 seq_printf(seq,
2574                            "%3d %6.6s 0x%08x "
2575                            "0x%08x %6lu %6lu\n",
2576                            state->dev->ifindex, state->dev->name,
2577                            ntohl(state->im->multiaddr),
2578                            ntohl(psf->sf_inaddr),
2579                            psf->sf_count[MCAST_INCLUDE],
2580                            psf->sf_count[MCAST_EXCLUDE]);
2581         }
2582         return 0;
2583 }
2584
2585 static const struct seq_operations igmp_mcf_seq_ops = {
2586         .start  =       igmp_mcf_seq_start,
2587         .next   =       igmp_mcf_seq_next,
2588         .stop   =       igmp_mcf_seq_stop,
2589         .show   =       igmp_mcf_seq_show,
2590 };
2591
2592 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2593 {
2594         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2595                         sizeof(struct igmp_mcf_iter_state));
2596 }
2597
2598 static const struct file_operations igmp_mcf_seq_fops = {
2599         .owner          =       THIS_MODULE,
2600         .open           =       igmp_mcf_seq_open,
2601         .read           =       seq_read,
2602         .llseek         =       seq_lseek,
2603         .release        =       seq_release_net,
2604 };
2605
2606 static int igmp_net_init(struct net *net)
2607 {
2608         struct proc_dir_entry *pde;
2609
2610         pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2611         if (!pde)
2612                 goto out_igmp;
2613         pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2614         if (!pde)
2615                 goto out_mcfilter;
2616         return 0;
2617
2618 out_mcfilter:
2619         proc_net_remove(net, "igmp");
2620 out_igmp:
2621         return -ENOMEM;
2622 }
2623
2624 static void igmp_net_exit(struct net *net)
2625 {
2626         proc_net_remove(net, "mcfilter");
2627         proc_net_remove(net, "igmp");
2628 }
2629
2630 static struct pernet_operations igmp_net_ops = {
2631         .init = igmp_net_init,
2632         .exit = igmp_net_exit,
2633 };
2634
2635 int __init igmp_mc_proc_init(void)
2636 {
2637         return register_pernet_subsys(&igmp_net_ops);
2638 }
2639 #endif
2640
2641 EXPORT_SYMBOL(ip_mc_dec_group);
2642 EXPORT_SYMBOL(ip_mc_inc_group);
2643 EXPORT_SYMBOL(ip_mc_join_group);
2644 EXPORT_SYMBOL(ip_mc_rejoin_group);