net/ipv4/igmp.c

   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Authors:
  12  *              Alan Cox <Alan.Cox@linux.org>
  13  *
  14  *      This program is free software; you can redistribute it and/or
  15  *      modify it under the terms of the GNU General Public License
  16  *      as published by the Free Software Foundation; either version
  17  *      2 of the License, or (at your option) any later version.
  18  *
  19  *      Fixes:
  20  *
  21  *              Alan Cox        :       Added lots of __inline__ to optimise
  22  *                                      the memory usage of all the tiny little
  23  *                                      functions.
  24  *              Alan Cox        :       Dumped the header building experiment.
  25  *              Alan Cox        :       Minor tweaks ready for multicast routing
  26  *                                      and extended IGMP protocol.
  27  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  28  *                                      writes utterly bogus code otherwise (sigh)
  29  *                                      fixed IGMP loopback to behave in the manner
  30  *                                      desired by mrouted, fixed the fact it has been
  31  *                                      broken since 1.3.6 and cleaned up a few minor
  32  *                                      points.
  33  *
  34  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  35  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  36  *                                      The enhancements are mainly based on Steve Deering's
  37  *                                      ipmulti-3.5 source code.
  38  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  39  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  40  *                                      the mrouted version on that device.
  41  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  42  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  43  *                                      to identify the multicast router version
  44  *                                      and do what the IGMP version 2 specified.
  45  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  46  *              Tsu-Sheng Tsao          if the specified time expired.
  47  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  48  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  49  *              Christian Daudt :       igmp timer wasn't set for local group
  50  *                                      memberships but was being deleted,
  51  *                                      which caused a "del_timer() called
  52  *                                      from %p with timer not initialized\n"
  53  *                                      message (960131).
  54  *              Christian Daudt :       removed del_timer from
  55  *                                      igmp_timer_expire function (960205).
  56  *             Christian Daudt :       igmp_heard_report now only calls
  57  *                                     igmp_timer_expire if tm->running is
  58  *                                     true (960216).
  59  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  60  *                                      igmp_heard_query never trigger. Expiry
  61  *                                      miscalculation fixed in igmp_heard_query
  62  *                                      and random() made to return unsigned to
  63  *                                      prevent negative expiry times.
  64  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  65  *                                      fix from pending 2.1.x patches.
  66  *              Alan Cox:               Forget to enable FDDI support earlier.
  67  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  68  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  69  *              David L Stevens:        IGMPv3 support, with help from
  70  *                                      Vinay Kulkarni
  71  */
  72
  73 #include <linux/module.h>
  74 #include <asm/uaccess.h>
  75 #include <asm/system.h>
  76 #include <linux/types.h>
  77 #include <linux/kernel.h>
  78 #include <linux/jiffies.h>
  79 #include <linux/string.h>
  80 #include <linux/socket.h>
  81 #include <linux/sockios.h>
  82 #include <linux/in.h>
  83 #include <linux/inet.h>
  84 #include <linux/netdevice.h>
  85 #include <linux/skbuff.h>
  86 #include <linux/inetdevice.h>
  87 #include <linux/igmp.h>
  88 #include <linux/if_arp.h>
  89 #include <linux/rtnetlink.h>
  90 #include <linux/times.h>
  91
  92 #include <net/net_namespace.h>
  93 #include <net/arp.h>
  94 #include <net/ip.h>
  95 #include <net/protocol.h>
  96 #include <net/route.h>
  97 #include <net/sock.h>
  98 #include <net/checksum.h>
  99 #include <linux/netfilter_ipv4.h>
 100 #ifdef CONFIG_IP_MROUTE
 101 #include <linux/mroute.h>
 102 #endif
 103 #ifdef CONFIG_PROC_FS
 104 #include <linux/proc_fs.h>
 105 #include <linux/seq_file.h>
 106 #endif
 107
 108 #define IP_MAX_MEMBERSHIPS      20
 109 #define IP_MAX_MSF              10
 110
 111 #ifdef CONFIG_IP_MULTICAST
 112 /* Parameter names and values are taken from igmp-v2-06 draft */
 113
 114 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 115 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 116 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 117 #define IGMP_Query_Response_Interval            (10*HZ)
 118 #define IGMP_Unsolicited_Report_Count           2
 119
 120
 121 #define IGMP_Initial_Report_Delay               (1)
 122
 123 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 124  * IGMP specs require to report membership immediately after
 125  * joining a group, but we delay the first report by a
 126  * small interval. It seems more natural and still does not
 127  * contradict to specs provided this delay is small enough.
 128  */
 129
 130 #define IGMP_V1_SEEN(in_dev) \
 131         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 132          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 133          ((in_dev)->mr_v1_seen && \
 134           time_before(jiffies, (in_dev)->mr_v1_seen)))
 135 #define IGMP_V2_SEEN(in_dev) \
 136         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 137          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 138          ((in_dev)->mr_v2_seen && \
 139           time_before(jiffies, (in_dev)->mr_v2_seen)))
 140
 141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 143 static void igmpv3_clear_delrec(struct in_device *in_dev);
 144 static int sf_setstate(struct ip_mc_list *pmc);
 145 static void sf_markstate(struct ip_mc_list *pmc);
 146 #endif
 147 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 149                          int sfcount, __be32 *psfsrc, int delta);
 150
 151 static void ip_ma_put(struct ip_mc_list *im)
 152 {
 153         if (atomic_dec_and_test(&im->refcnt)) {
 154                 in_dev_put(im->interface);
 155                 kfree(im);
 156         }
 157 }
 158
 159 #ifdef CONFIG_IP_MULTICAST
 160
 161 /*
 162  *      Timer management
 163  */
 164
 165 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 166 {
 167         spin_lock_bh(&im->lock);
 168         if (del_timer(&im->timer))
 169                 atomic_dec(&im->refcnt);
 170         im->tm_running=0;
 171         im->reporter = 0;
 172         im->unsolicit_count = 0;
 173         spin_unlock_bh(&im->lock);
 174 }
 175
 176 /* It must be called with locked im->lock */
 177 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 178 {
 179         int tv=net_random() % max_delay;
 180
 181         im->tm_running=1;
 182         if (!mod_timer(&im->timer, jiffies+tv+2))
 183                 atomic_inc(&im->refcnt);
 184 }
 185
 186 static void igmp_gq_start_timer(struct in_device *in_dev)
 187 {
 188         int tv = net_random() % in_dev->mr_maxdelay;
 189
 190         in_dev->mr_gq_running = 1;
 191         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 192                 in_dev_hold(in_dev);
 193 }
 194
 195 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 196 {
 197         int tv = net_random() % delay;
 198
 199         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 200                 in_dev_hold(in_dev);
 201 }
 202
 203 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 204 {
 205         spin_lock_bh(&im->lock);
 206         im->unsolicit_count = 0;
 207         if (del_timer(&im->timer)) {
 208                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 209                         add_timer(&im->timer);
 210                         im->tm_running=1;
 211                         spin_unlock_bh(&im->lock);
 212                         return;
 213                 }
 214                 atomic_dec(&im->refcnt);
 215         }
 216         igmp_start_timer(im, max_delay);
 217         spin_unlock_bh(&im->lock);
 218 }
 219
 220
 221 /*
 222  *      Send an IGMP report.
 223  */
 224
 225 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 226
 227
 228 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 229         int gdeleted, int sdeleted)
 230 {
 231         switch (type) {
 232         case IGMPV3_MODE_IS_INCLUDE:
 233         case IGMPV3_MODE_IS_EXCLUDE:
 234                 if (gdeleted || sdeleted)
 235                         return 0;
 236                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 237                         if (pmc->sfmode == MCAST_INCLUDE)
 238                                 return 1;
 239                         /* don't include if this source is excluded
 240                          * in all filters
 241                          */
 242                         if (psf->sf_count[MCAST_INCLUDE])
 243                                 return type == IGMPV3_MODE_IS_INCLUDE;
 244                         return pmc->sfcount[MCAST_EXCLUDE] ==
 245                                 psf->sf_count[MCAST_EXCLUDE];
 246                 }
 247                 return 0;
 248         case IGMPV3_CHANGE_TO_INCLUDE:
 249                 if (gdeleted || sdeleted)
 250                         return 0;
 251                 return psf->sf_count[MCAST_INCLUDE] != 0;
 252         case IGMPV3_CHANGE_TO_EXCLUDE:
 253                 if (gdeleted || sdeleted)
 254                         return 0;
 255                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 256                     psf->sf_count[MCAST_INCLUDE])
 257                         return 0;
 258                 return pmc->sfcount[MCAST_EXCLUDE] ==
 259                         psf->sf_count[MCAST_EXCLUDE];
 260         case IGMPV3_ALLOW_NEW_SOURCES:
 261                 if (gdeleted || !psf->sf_crcount)
 262                         return 0;
 263                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 264         case IGMPV3_BLOCK_OLD_SOURCES:
 265                 if (pmc->sfmode == MCAST_INCLUDE)
 266                         return gdeleted || (psf->sf_crcount && sdeleted);
 267                 return psf->sf_crcount && !gdeleted && !sdeleted;
 268         }
 269         return 0;
 270 }
 271
 272 static int
 273 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 274 {
 275         struct ip_sf_list *psf;
 276         int scount = 0;
 277
 278         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 279                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 280                         continue;
 281                 scount++;
 282         }
 283         return scount;
 284 }
 285
 286 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 287 {
 288         struct sk_buff *skb;
 289         struct rtable *rt;
 290         struct iphdr *pip;
 291         struct igmpv3_report *pig;
 292
 293         skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 294         if (skb == NULL)
 295                 return NULL;
 296
 297         {
 298                 struct flowi fl = { .oif = dev->ifindex,
 299                                     .nl_u = { .ip4_u = {
 300                                     .daddr = IGMPV3_ALL_MCR } },
 301                                     .proto = IPPROTO_IGMP };
 302                 if (ip_route_output_key(&init_net, &rt, &fl)) {
 303                         kfree_skb(skb);
 304                         return NULL;
 305                 }
 306         }
 307         if (rt->rt_src == 0) {
 308                 kfree_skb(skb);
 309                 ip_rt_put(rt);
 310                 return NULL;
 311         }
 312
 313         skb->dst = &rt->u.dst;
 314         skb->dev = dev;
 315
 316         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 317
 318         skb_reset_network_header(skb);
 319         pip = ip_hdr(skb);
 320         skb_put(skb, sizeof(struct iphdr) + 4);
 321
 322         pip->version  = 4;
 323         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 324         pip->tos      = 0xc0;
 325         pip->frag_off = htons(IP_DF);
 326         pip->ttl      = 1;
 327         pip->daddr    = rt->rt_dst;
 328         pip->saddr    = rt->rt_src;
 329         pip->protocol = IPPROTO_IGMP;
 330         pip->tot_len  = 0;      /* filled in later */
 331         ip_select_ident(pip, &rt->u.dst, NULL);
 332         ((u8*)&pip[1])[0] = IPOPT_RA;
 333         ((u8*)&pip[1])[1] = 4;
 334         ((u8*)&pip[1])[2] = 0;
 335         ((u8*)&pip[1])[3] = 0;
 336
 337         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 338         skb_put(skb, sizeof(*pig));
 339         pig = igmpv3_report_hdr(skb);
 340         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 341         pig->resv1 = 0;
 342         pig->csum = 0;
 343         pig->resv2 = 0;
 344         pig->ngrec = 0;
 345         return skb;
 346 }
 347
 348 static int igmpv3_sendpack(struct sk_buff *skb)
 349 {
 350         struct igmphdr *pig = igmp_hdr(skb);
 351         const int igmplen = skb->tail - skb->transport_header;
 352
 353         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 354
 355         return ip_local_out(skb);
 356 }
 357
 358 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 359 {
 360         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
 361 }
 362
 363 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 364         int type, struct igmpv3_grec **ppgr)
 365 {
 366         struct net_device *dev = pmc->interface->dev;
 367         struct igmpv3_report *pih;
 368         struct igmpv3_grec *pgr;
 369
 370         if (!skb)
 371                 skb = igmpv3_newpack(dev, dev->mtu);
 372         if (!skb)
 373                 return NULL;
 374         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 375         pgr->grec_type = type;
 376         pgr->grec_auxwords = 0;
 377         pgr->grec_nsrcs = 0;
 378         pgr->grec_mca = pmc->multiaddr;
 379         pih = igmpv3_report_hdr(skb);
 380         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 381         *ppgr = pgr;
 382         return skb;
 383 }
 384
 385 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 386         skb_tailroom(skb)) : 0)
 387
 388 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 389         int type, int gdeleted, int sdeleted)
 390 {
 391         struct net_device *dev = pmc->interface->dev;
 392         struct igmpv3_report *pih;
 393         struct igmpv3_grec *pgr = NULL;
 394         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 395         int scount, stotal, first, isquery, truncate;
 396
 397         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 398                 return skb;
 399
 400         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 401                   type == IGMPV3_MODE_IS_EXCLUDE;
 402         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 403                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 404
 405         stotal = scount = 0;
 406
 407         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 408
 409         if (!*psf_list)
 410                 goto empty_source;
 411
 412         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 413
 414         /* EX and TO_EX get a fresh packet, if needed */
 415         if (truncate) {
 416                 if (pih && pih->ngrec &&
 417                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 418                         if (skb)
 419                                 igmpv3_sendpack(skb);
 420                         skb = igmpv3_newpack(dev, dev->mtu);
 421                 }
 422         }
 423         first = 1;
 424         psf_prev = NULL;
 425         for (psf=*psf_list; psf; psf=psf_next) {
 426                 __be32 *psrc;
 427
 428                 psf_next = psf->sf_next;
 429
 430                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 431                         psf_prev = psf;
 432                         continue;
 433                 }
 434
 435                 /* clear marks on query responses */
 436                 if (isquery)
 437                         psf->sf_gsresp = 0;
 438
 439                 if (AVAILABLE(skb) < sizeof(__be32) +
 440                     first*sizeof(struct igmpv3_grec)) {
 441                         if (truncate && !first)
 442                                 break;   /* truncate these */
 443                         if (pgr)
 444                                 pgr->grec_nsrcs = htons(scount);
 445                         if (skb)
 446                                 igmpv3_sendpack(skb);
 447                         skb = igmpv3_newpack(dev, dev->mtu);
 448                         first = 1;
 449                         scount = 0;
 450                 }
 451                 if (first) {
 452                         skb = add_grhead(skb, pmc, type, &pgr);
 453                         first = 0;
 454                 }
 455                 if (!skb)
 456                         return NULL;
 457                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 458                 *psrc = psf->sf_inaddr;
 459                 scount++; stotal++;
 460                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 461                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 462                         psf->sf_crcount--;
 463                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 464                                 if (psf_prev)
 465                                         psf_prev->sf_next = psf->sf_next;
 466                                 else
 467                                         *psf_list = psf->sf_next;
 468                                 kfree(psf);
 469                                 continue;
 470                         }
 471                 }
 472                 psf_prev = psf;
 473         }
 474
 475 empty_source:
 476         if (!stotal) {
 477                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 478                     type == IGMPV3_BLOCK_OLD_SOURCES)
 479                         return skb;
 480                 if (pmc->crcount || isquery) {
 481                         /* make sure we have room for group header */
 482                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 483                                 igmpv3_sendpack(skb);
 484                                 skb = NULL; /* add_grhead will get a new one */
 485                         }
 486                         skb = add_grhead(skb, pmc, type, &pgr);
 487                 }
 488         }
 489         if (pgr)
 490                 pgr->grec_nsrcs = htons(scount);
 491
 492         if (isquery)
 493                 pmc->gsquery = 0;       /* clear query state on report */
 494         return skb;
 495 }
 496
 497 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 498 {
 499         struct sk_buff *skb = NULL;
 500         int type;
 501
 502         if (!pmc) {
 503                 read_lock(&in_dev->mc_list_lock);
 504                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 505                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 506                                 continue;
 507                         spin_lock_bh(&pmc->lock);
 508                         if (pmc->sfcount[MCAST_EXCLUDE])
 509                                 type = IGMPV3_MODE_IS_EXCLUDE;
 510                         else
 511                                 type = IGMPV3_MODE_IS_INCLUDE;
 512                         skb = add_grec(skb, pmc, type, 0, 0);
 513                         spin_unlock_bh(&pmc->lock);
 514                 }
 515                 read_unlock(&in_dev->mc_list_lock);
 516         } else {
 517                 spin_lock_bh(&pmc->lock);
 518                 if (pmc->sfcount[MCAST_EXCLUDE])
 519                         type = IGMPV3_MODE_IS_EXCLUDE;
 520                 else
 521                         type = IGMPV3_MODE_IS_INCLUDE;
 522                 skb = add_grec(skb, pmc, type, 0, 0);
 523                 spin_unlock_bh(&pmc->lock);
 524         }
 525         if (!skb)
 526                 return 0;
 527         return igmpv3_sendpack(skb);
 528 }
 529
 530 /*
 531  * remove zero-count source records from a source filter list
 532  */
 533 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 534 {
 535         struct ip_sf_list *psf_prev, *psf_next, *psf;
 536
 537         psf_prev = NULL;
 538         for (psf=*ppsf; psf; psf = psf_next) {
 539                 psf_next = psf->sf_next;
 540                 if (psf->sf_crcount == 0) {
 541                         if (psf_prev)
 542                                 psf_prev->sf_next = psf->sf_next;
 543                         else
 544                                 *ppsf = psf->sf_next;
 545                         kfree(psf);
 546                 } else
 547                         psf_prev = psf;
 548         }
 549 }
 550
 551 static void igmpv3_send_cr(struct in_device *in_dev)
 552 {
 553         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 554         struct sk_buff *skb = NULL;
 555         int type, dtype;
 556
 557         read_lock(&in_dev->mc_list_lock);
 558         spin_lock_bh(&in_dev->mc_tomb_lock);
 559
 560         /* deleted MCA's */
 561         pmc_prev = NULL;
 562         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 563                 pmc_next = pmc->next;
 564                 if (pmc->sfmode == MCAST_INCLUDE) {
 565                         type = IGMPV3_BLOCK_OLD_SOURCES;
 566                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 567                         skb = add_grec(skb, pmc, type, 1, 0);
 568                         skb = add_grec(skb, pmc, dtype, 1, 1);
 569                 }
 570                 if (pmc->crcount) {
 571                         if (pmc->sfmode == MCAST_EXCLUDE) {
 572                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 573                                 skb = add_grec(skb, pmc, type, 1, 0);
 574                         }
 575                         pmc->crcount--;
 576                         if (pmc->crcount == 0) {
 577                                 igmpv3_clear_zeros(&pmc->tomb);
 578                                 igmpv3_clear_zeros(&pmc->sources);
 579                         }
 580                 }
 581                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 582                         if (pmc_prev)
 583                                 pmc_prev->next = pmc_next;
 584                         else
 585                                 in_dev->mc_tomb = pmc_next;
 586                         in_dev_put(pmc->interface);
 587                         kfree(pmc);
 588                 } else
 589                         pmc_prev = pmc;
 590         }
 591         spin_unlock_bh(&in_dev->mc_tomb_lock);
 592
 593         /* change recs */
 594         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 595                 spin_lock_bh(&pmc->lock);
 596                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 597                         type = IGMPV3_BLOCK_OLD_SOURCES;
 598                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 599                 } else {
 600                         type = IGMPV3_ALLOW_NEW_SOURCES;
 601                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 602                 }
 603                 skb = add_grec(skb, pmc, type, 0, 0);
 604                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 605
 606                 /* filter mode changes */
 607                 if (pmc->crcount) {
 608                         if (pmc->sfmode == MCAST_EXCLUDE)
 609                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 610                         else
 611                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 612                         skb = add_grec(skb, pmc, type, 0, 0);
 613                         pmc->crcount--;
 614                 }
 615                 spin_unlock_bh(&pmc->lock);
 616         }
 617         read_unlock(&in_dev->mc_list_lock);
 618
 619         if (!skb)
 620                 return;
 621         (void) igmpv3_sendpack(skb);
 622 }
 623
 624 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 625         int type)
 626 {
 627         struct sk_buff *skb;
 628         struct iphdr *iph;
 629         struct igmphdr *ih;
 630         struct rtable *rt;
 631         struct net_device *dev = in_dev->dev;
 632         __be32  group = pmc ? pmc->multiaddr : 0;
 633         __be32  dst;
 634
 635         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 636                 return igmpv3_send_report(in_dev, pmc);
 637         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 638                 dst = IGMP_ALL_ROUTER;
 639         else
 640                 dst = group;
 641
 642         {
 643                 struct flowi fl = { .oif = dev->ifindex,
 644                                     .nl_u = { .ip4_u = { .daddr = dst } },
 645                                     .proto = IPPROTO_IGMP };
 646                 if (ip_route_output_key(&init_net, &rt, &fl))
 647                         return -1;
 648         }
 649         if (rt->rt_src == 0) {
 650                 ip_rt_put(rt);
 651                 return -1;
 652         }
 653
 654         skb=alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 655         if (skb == NULL) {
 656                 ip_rt_put(rt);
 657                 return -1;
 658         }
 659
 660         skb->dst = &rt->u.dst;
 661
 662         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 663
 664         skb_reset_network_header(skb);
 665         iph = ip_hdr(skb);
 666         skb_put(skb, sizeof(struct iphdr) + 4);
 667
 668         iph->version  = 4;
 669         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 670         iph->tos      = 0xc0;
 671         iph->frag_off = htons(IP_DF);
 672         iph->ttl      = 1;
 673         iph->daddr    = dst;
 674         iph->saddr    = rt->rt_src;
 675         iph->protocol = IPPROTO_IGMP;
 676         ip_select_ident(iph, &rt->u.dst, NULL);
 677         ((u8*)&iph[1])[0] = IPOPT_RA;
 678         ((u8*)&iph[1])[1] = 4;
 679         ((u8*)&iph[1])[2] = 0;
 680         ((u8*)&iph[1])[3] = 0;
 681
 682         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 683         ih->type=type;
 684         ih->code=0;
 685         ih->csum=0;
 686         ih->group=group;
 687         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 688
 689         return ip_local_out(skb);
 690 }
 691
 692 static void igmp_gq_timer_expire(unsigned long data)
 693 {
 694         struct in_device *in_dev = (struct in_device *)data;
 695
 696         in_dev->mr_gq_running = 0;
 697         igmpv3_send_report(in_dev, NULL);
 698         __in_dev_put(in_dev);
 699 }
 700
 701 static void igmp_ifc_timer_expire(unsigned long data)
 702 {
 703         struct in_device *in_dev = (struct in_device *)data;
 704
 705         igmpv3_send_cr(in_dev);
 706         if (in_dev->mr_ifc_count) {
 707                 in_dev->mr_ifc_count--;
 708                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 709         }
 710         __in_dev_put(in_dev);
 711 }
 712
 713 static void igmp_ifc_event(struct in_device *in_dev)
 714 {
 715         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 716                 return;
 717         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 718                 IGMP_Unsolicited_Report_Count;
 719         igmp_ifc_start_timer(in_dev, 1);
 720 }
 721
 722
 723 static void igmp_timer_expire(unsigned long data)
 724 {
 725         struct ip_mc_list *im=(struct ip_mc_list *)data;
 726         struct in_device *in_dev = im->interface;
 727
 728         spin_lock(&im->lock);
 729         im->tm_running=0;
 730
 731         if (im->unsolicit_count) {
 732                 im->unsolicit_count--;
 733                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 734         }
 735         im->reporter = 1;
 736         spin_unlock(&im->lock);
 737
 738         if (IGMP_V1_SEEN(in_dev))
 739                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 740         else if (IGMP_V2_SEEN(in_dev))
 741                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 742         else
 743                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 744
 745         ip_ma_put(im);
 746 }
 747
 748 /* mark EXCLUDE-mode sources */
 749 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 750 {
 751         struct ip_sf_list *psf;
 752         int i, scount;
 753
 754         scount = 0;
 755         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 756                 if (scount == nsrcs)
 757                         break;
 758                 for (i=0; i<nsrcs; i++) {
 759                         /* skip inactive filters */
 760                         if (pmc->sfcount[MCAST_INCLUDE] ||
 761                             pmc->sfcount[MCAST_EXCLUDE] !=
 762                             psf->sf_count[MCAST_EXCLUDE])
 763                                 continue;
 764                         if (srcs[i] == psf->sf_inaddr) {
 765                                 scount++;
 766                                 break;
 767                         }
 768                 }
 769         }
 770         pmc->gsquery = 0;
 771         if (scount == nsrcs)    /* all sources excluded */
 772                 return 0;
 773         return 1;
 774 }
 775
 776 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 777 {
 778         struct ip_sf_list *psf;
 779         int i, scount;
 780
 781         if (pmc->sfmode == MCAST_EXCLUDE)
 782                 return igmp_xmarksources(pmc, nsrcs, srcs);
 783
 784         /* mark INCLUDE-mode sources */
 785         scount = 0;
 786         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 787                 if (scount == nsrcs)
 788                         break;
 789                 for (i=0; i<nsrcs; i++)
 790                         if (srcs[i] == psf->sf_inaddr) {
 791                                 psf->sf_gsresp = 1;
 792                                 scount++;
 793                                 break;
 794                         }
 795         }
 796         if (!scount) {
 797                 pmc->gsquery = 0;
 798                 return 0;
 799         }
 800         pmc->gsquery = 1;
 801         return 1;
 802 }
 803
 804 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 805 {
 806         struct ip_mc_list *im;
 807
 808         /* Timers are only set for non-local groups */
 809
 810         if (group == IGMP_ALL_HOSTS)
 811                 return;
 812
 813         read_lock(&in_dev->mc_list_lock);
 814         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 815                 if (im->multiaddr == group) {
 816                         igmp_stop_timer(im);
 817                         break;
 818                 }
 819         }
 820         read_unlock(&in_dev->mc_list_lock);
 821 }
 822
 823 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 824         int len)
 825 {
 826         struct igmphdr          *ih = igmp_hdr(skb);
 827         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 828         struct ip_mc_list       *im;
 829         __be32                  group = ih->group;
 830         int                     max_delay;
 831         int                     mark = 0;
 832
 833
 834         if (len == 8) {
 835                 if (ih->code == 0) {
 836                         /* Alas, old v1 router presents here. */
 837
 838                         max_delay = IGMP_Query_Response_Interval;
 839                         in_dev->mr_v1_seen = jiffies +
 840                                 IGMP_V1_Router_Present_Timeout;
 841                         group = 0;
 842                 } else {
 843                         /* v2 router present */
 844                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 845                         in_dev->mr_v2_seen = jiffies +
 846                                 IGMP_V2_Router_Present_Timeout;
 847                 }
 848                 /* cancel the interface change timer */
 849                 in_dev->mr_ifc_count = 0;
 850                 if (del_timer(&in_dev->mr_ifc_timer))
 851                         __in_dev_put(in_dev);
 852                 /* clear deleted report items */
 853                 igmpv3_clear_delrec(in_dev);
 854         } else if (len < 12) {
 855                 return; /* ignore bogus packet; freed by caller */
 856         } else { /* v3 */
 857                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 858                         return;
 859
 860                 ih3 = igmpv3_query_hdr(skb);
 861                 if (ih3->nsrcs) {
 862                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 863                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 864                                 return;
 865                         ih3 = igmpv3_query_hdr(skb);
 866                 }
 867
 868                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 869                 if (!max_delay)
 870                         max_delay = 1;  /* can't mod w/ 0 */
 871                 in_dev->mr_maxdelay = max_delay;
 872                 if (ih3->qrv)
 873                         in_dev->mr_qrv = ih3->qrv;
 874                 if (!group) { /* general query */
 875                         if (ih3->nsrcs)
 876                                 return; /* no sources allowed */
 877                         igmp_gq_start_timer(in_dev);
 878                         return;
 879                 }
 880                 /* mark sources to include, if group & source-specific */
 881                 mark = ih3->nsrcs != 0;
 882         }
 883
 884         /*
 885          * - Start the timers in all of our membership records
 886          *   that the query applies to for the interface on
 887          *   which the query arrived excl. those that belong
 888          *   to a "local" group (224.0.0.X)
 889          * - For timers already running check if they need to
 890          *   be reset.
 891          * - Use the igmp->igmp_code field as the maximum
 892          *   delay possible
 893          */
 894         read_lock(&in_dev->mc_list_lock);
 895         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 896                 int changed;
 897
 898                 if (group && group != im->multiaddr)
 899                         continue;
 900                 if (im->multiaddr == IGMP_ALL_HOSTS)
 901                         continue;
 902                 spin_lock_bh(&im->lock);
 903                 if (im->tm_running)
 904                         im->gsquery = im->gsquery && mark;
 905                 else
 906                         im->gsquery = mark;
 907                 changed = !im->gsquery ||
 908                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 909                 spin_unlock_bh(&im->lock);
 910                 if (changed)
 911                         igmp_mod_timer(im, max_delay);
 912         }
 913         read_unlock(&in_dev->mc_list_lock);
 914 }
 915
 916 int igmp_rcv(struct sk_buff *skb)
 917 {
 918         /* This basically follows the spec line by line -- see RFC1112 */
 919         struct igmphdr *ih;
 920         struct in_device *in_dev = in_dev_get(skb->dev);
 921         int len = skb->len;
 922
 923         if (in_dev == NULL)
 924                 goto drop;
 925
 926         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 927                 goto drop_ref;
 928
 929         switch (skb->ip_summed) {
 930         case CHECKSUM_COMPLETE:
 931                 if (!csum_fold(skb->csum))
 932                         break;
 933                 /* fall through */
 934         case CHECKSUM_NONE:
 935                 skb->csum = 0;
 936                 if (__skb_checksum_complete(skb))
 937                         goto drop_ref;
 938         }
 939
 940         ih = igmp_hdr(skb);
 941         switch (ih->type) {
 942         case IGMP_HOST_MEMBERSHIP_QUERY:
 943                 igmp_heard_query(in_dev, skb, len);
 944                 break;
 945         case IGMP_HOST_MEMBERSHIP_REPORT:
 946         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 947         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 948                 /* Is it our report looped back? */
 949                 if (skb->rtable->fl.iif == 0)
 950                         break;
 951                 /* don't rely on MC router hearing unicast reports */
 952                 if (skb->pkt_type == PACKET_MULTICAST ||
 953                     skb->pkt_type == PACKET_BROADCAST)
 954                         igmp_heard_report(in_dev, ih->group);
 955                 break;
 956         case IGMP_PIM:
 957 #ifdef CONFIG_IP_PIMSM_V1
 958                 in_dev_put(in_dev);
 959                 return pim_rcv_v1(skb);
 960 #endif
 961         case IGMP_DVMRP:
 962         case IGMP_TRACE:
 963         case IGMP_HOST_LEAVE_MESSAGE:
 964         case IGMP_MTRACE:
 965         case IGMP_MTRACE_RESP:
 966                 break;
 967         default:
 968                 break;
 969         }
 970
 971 drop_ref:
 972         in_dev_put(in_dev);
 973 drop:
 974         kfree_skb(skb);
 975         return 0;
 976 }
 977
 978 #endif
 979
 980
 981 /*
 982  *      Add a filter to a device
 983  */
 984
 985 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 986 {
 987         char buf[MAX_ADDR_LEN];
 988         struct net_device *dev = in_dev->dev;
 989
 990         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 991            We will get multicast token leakage, when IFF_MULTICAST
 992            is changed. This check should be done in dev->set_multicast_list
 993            routine. Something sort of:
 994            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 995            --ANK
 996            */
 997         if (arp_mc_map(addr, buf, dev, 0) == 0)
 998                 dev_mc_add(dev,buf,dev->addr_len,0);
 999 }
1000
1001 /*
1002  *      Remove a filter from a device
1003  */
1004
1005 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1006 {
1007         char buf[MAX_ADDR_LEN];
1008         struct net_device *dev = in_dev->dev;
1009
1010         if (arp_mc_map(addr, buf, dev, 0) == 0)
1011                 dev_mc_delete(dev,buf,dev->addr_len,0);
1012 }
1013
1014 #ifdef CONFIG_IP_MULTICAST
1015 /*
1016  * deleted ip_mc_list manipulation
1017  */
1018 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1019 {
1020         struct ip_mc_list *pmc;
1021
1022         /* this is an "ip_mc_list" for convenience; only the fields below
1023          * are actually used. In particular, the refcnt and users are not
1024          * used for management of the delete list. Using the same structure
1025          * for deleted items allows change reports to use common code with
1026          * non-deleted or query-response MCA's.
1027          */
1028         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1029         if (!pmc)
1030                 return;
1031         spin_lock_bh(&im->lock);
1032         pmc->interface = im->interface;
1033         in_dev_hold(in_dev);
1034         pmc->multiaddr = im->multiaddr;
1035         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1036                 IGMP_Unsolicited_Report_Count;
1037         pmc->sfmode = im->sfmode;
1038         if (pmc->sfmode == MCAST_INCLUDE) {
1039                 struct ip_sf_list *psf;
1040
1041                 pmc->tomb = im->tomb;
1042                 pmc->sources = im->sources;
1043                 im->tomb = im->sources = NULL;
1044                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1045                         psf->sf_crcount = pmc->crcount;
1046         }
1047         spin_unlock_bh(&im->lock);
1048
1049         spin_lock_bh(&in_dev->mc_tomb_lock);
1050         pmc->next = in_dev->mc_tomb;
1051         in_dev->mc_tomb = pmc;
1052         spin_unlock_bh(&in_dev->mc_tomb_lock);
1053 }
1054
1055 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1056 {
1057         struct ip_mc_list *pmc, *pmc_prev;
1058         struct ip_sf_list *psf, *psf_next;
1059
1060         spin_lock_bh(&in_dev->mc_tomb_lock);
1061         pmc_prev = NULL;
1062         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1063                 if (pmc->multiaddr == multiaddr)
1064                         break;
1065                 pmc_prev = pmc;
1066         }
1067         if (pmc) {
1068                 if (pmc_prev)
1069                         pmc_prev->next = pmc->next;
1070                 else
1071                         in_dev->mc_tomb = pmc->next;
1072         }
1073         spin_unlock_bh(&in_dev->mc_tomb_lock);
1074         if (pmc) {
1075                 for (psf=pmc->tomb; psf; psf=psf_next) {
1076                         psf_next = psf->sf_next;
1077                         kfree(psf);
1078                 }
1079                 in_dev_put(pmc->interface);
1080                 kfree(pmc);
1081         }
1082 }
1083
1084 static void igmpv3_clear_delrec(struct in_device *in_dev)
1085 {
1086         struct ip_mc_list *pmc, *nextpmc;
1087
1088         spin_lock_bh(&in_dev->mc_tomb_lock);
1089         pmc = in_dev->mc_tomb;
1090         in_dev->mc_tomb = NULL;
1091         spin_unlock_bh(&in_dev->mc_tomb_lock);
1092
1093         for (; pmc; pmc = nextpmc) {
1094                 nextpmc = pmc->next;
1095                 ip_mc_clear_src(pmc);
1096                 in_dev_put(pmc->interface);
1097                 kfree(pmc);
1098         }
1099         /* clear dead sources, too */
1100         read_lock(&in_dev->mc_list_lock);
1101         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1102                 struct ip_sf_list *psf, *psf_next;
1103
1104                 spin_lock_bh(&pmc->lock);
1105                 psf = pmc->tomb;
1106                 pmc->tomb = NULL;
1107                 spin_unlock_bh(&pmc->lock);
1108                 for (; psf; psf=psf_next) {
1109                         psf_next = psf->sf_next;
1110                         kfree(psf);
1111                 }
1112         }
1113         read_unlock(&in_dev->mc_list_lock);
1114 }
1115 #endif
1116
1117 static void igmp_group_dropped(struct ip_mc_list *im)
1118 {
1119         struct in_device *in_dev = im->interface;
1120 #ifdef CONFIG_IP_MULTICAST
1121         int reporter;
1122 #endif
1123
1124         if (im->loaded) {
1125                 im->loaded = 0;
1126                 ip_mc_filter_del(in_dev, im->multiaddr);
1127         }
1128
1129 #ifdef CONFIG_IP_MULTICAST
1130         if (im->multiaddr == IGMP_ALL_HOSTS)
1131                 return;
1132
1133         reporter = im->reporter;
1134         igmp_stop_timer(im);
1135
1136         if (!in_dev->dead) {
1137                 if (IGMP_V1_SEEN(in_dev))
1138                         goto done;
1139                 if (IGMP_V2_SEEN(in_dev)) {
1140                         if (reporter)
1141                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1142                         goto done;
1143                 }
1144                 /* IGMPv3 */
1145                 igmpv3_add_delrec(in_dev, im);
1146
1147                 igmp_ifc_event(in_dev);
1148         }
1149 done:
1150 #endif
1151         ip_mc_clear_src(im);
1152 }
1153
1154 static void igmp_group_added(struct ip_mc_list *im)
1155 {
1156         struct in_device *in_dev = im->interface;
1157
1158         if (im->loaded == 0) {
1159                 im->loaded = 1;
1160                 ip_mc_filter_add(in_dev, im->multiaddr);
1161         }
1162
1163 #ifdef CONFIG_IP_MULTICAST
1164         if (im->multiaddr == IGMP_ALL_HOSTS)
1165                 return;
1166
1167         if (in_dev->dead)
1168                 return;
1169         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1170                 spin_lock_bh(&im->lock);
1171                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1172                 spin_unlock_bh(&im->lock);
1173                 return;
1174         }
1175         /* else, v3 */
1176
1177         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1178                 IGMP_Unsolicited_Report_Count;
1179         igmp_ifc_event(in_dev);
1180 #endif
1181 }
1182
1183
1184 /*
1185  *      Multicast list managers
1186  */
1187
1188
1189 /*
1190  *      A socket has joined a multicast group on device dev.
1191  */
1192
1193 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1194 {
1195         struct ip_mc_list *im;
1196
1197         ASSERT_RTNL();
1198
1199         if (!net_eq(dev_net(in_dev->dev), &init_net))
1200                 return;
1201
1202         for (im=in_dev->mc_list; im; im=im->next) {
1203                 if (im->multiaddr == addr) {
1204                         im->users++;
1205                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1206                         goto out;
1207                 }
1208         }
1209
1210         im = kmalloc(sizeof(*im), GFP_KERNEL);
1211         if (!im)
1212                 goto out;
1213
1214         im->users=1;
1215         im->interface=in_dev;
1216         in_dev_hold(in_dev);
1217         im->multiaddr=addr;
1218         /* initial mode is (EX, empty) */
1219         im->sfmode = MCAST_EXCLUDE;
1220         im->sfcount[MCAST_INCLUDE] = 0;
1221         im->sfcount[MCAST_EXCLUDE] = 1;
1222         im->sources = NULL;
1223         im->tomb = NULL;
1224         im->crcount = 0;
1225         atomic_set(&im->refcnt, 1);
1226         spin_lock_init(&im->lock);
1227 #ifdef CONFIG_IP_MULTICAST
1228         im->tm_running=0;
1229         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1230         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1231         im->reporter = 0;
1232         im->gsquery = 0;
1233 #endif
1234         im->loaded = 0;
1235         write_lock_bh(&in_dev->mc_list_lock);
1236         im->next=in_dev->mc_list;
1237         in_dev->mc_list=im;
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         if (!net_eq(dev_net(in_dev->dev), &init_net))
1282                 return;
1283
1284         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1285                 if (i->multiaddr==addr) {
1286                         if (--i->users == 0) {
1287                                 write_lock_bh(&in_dev->mc_list_lock);
1288                                 *ip = i->next;
1289                                 write_unlock_bh(&in_dev->mc_list_lock);
1290                                 igmp_group_dropped(i);
1291
1292                                 if (!in_dev->dead)
1293                                         ip_rt_multicast_event(in_dev);
1294
1295                                 ip_ma_put(i);
1296                                 return;
1297                         }
1298                         break;
1299                 }
1300         }
1301 }
1302
1303 /* Device going down */
1304
1305 void ip_mc_down(struct in_device *in_dev)
1306 {
1307         struct ip_mc_list *i;
1308
1309         ASSERT_RTNL();
1310
1311         if (!net_eq(dev_net(in_dev->dev), &init_net))
1312                 return;
1313
1314         for (i=in_dev->mc_list; i; i=i->next)
1315                 igmp_group_dropped(i);
1316
1317 #ifdef CONFIG_IP_MULTICAST
1318         in_dev->mr_ifc_count = 0;
1319         if (del_timer(&in_dev->mr_ifc_timer))
1320                 __in_dev_put(in_dev);
1321         in_dev->mr_gq_running = 0;
1322         if (del_timer(&in_dev->mr_gq_timer))
1323                 __in_dev_put(in_dev);
1324         igmpv3_clear_delrec(in_dev);
1325 #endif
1326
1327         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1328 }
1329
1330 void ip_mc_init_dev(struct in_device *in_dev)
1331 {
1332         ASSERT_RTNL();
1333
1334         if (!net_eq(dev_net(in_dev->dev), &init_net))
1335                 return;
1336
1337         in_dev->mc_tomb = NULL;
1338 #ifdef CONFIG_IP_MULTICAST
1339         in_dev->mr_gq_running = 0;
1340         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1341                         (unsigned long)in_dev);
1342         in_dev->mr_ifc_count = 0;
1343         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1344                         (unsigned long)in_dev);
1345         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1346 #endif
1347
1348         rwlock_init(&in_dev->mc_list_lock);
1349         spin_lock_init(&in_dev->mc_tomb_lock);
1350 }
1351
1352 /* Device going up */
1353
1354 void ip_mc_up(struct in_device *in_dev)
1355 {
1356         struct ip_mc_list *i;
1357
1358         ASSERT_RTNL();
1359
1360         if (!net_eq(dev_net(in_dev->dev), &init_net))
1361                 return;
1362
1363         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1364
1365         for (i=in_dev->mc_list; i; i=i->next)
1366                 igmp_group_added(i);
1367 }
1368
1369 /*
1370  *      Device is about to be destroyed: clean up.
1371  */
1372
1373 void ip_mc_destroy_dev(struct in_device *in_dev)
1374 {
1375         struct ip_mc_list *i;
1376
1377         ASSERT_RTNL();
1378
1379         if (!net_eq(dev_net(in_dev->dev), &init_net))
1380                 return;
1381
1382         /* Deactivate timers */
1383         ip_mc_down(in_dev);
1384
1385         write_lock_bh(&in_dev->mc_list_lock);
1386         while ((i = in_dev->mc_list) != NULL) {
1387                 in_dev->mc_list = i->next;
1388                 write_unlock_bh(&in_dev->mc_list_lock);
1389
1390                 igmp_group_dropped(i);
1391                 ip_ma_put(i);
1392
1393                 write_lock_bh(&in_dev->mc_list_lock);
1394         }
1395         write_unlock_bh(&in_dev->mc_list_lock);
1396 }
1397
1398 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1399 {
1400         struct flowi fl = { .nl_u = { .ip4_u =
1401                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1402         struct rtable *rt;
1403         struct net_device *dev = NULL;
1404         struct in_device *idev = NULL;
1405
1406         if (imr->imr_ifindex) {
1407                 idev = inetdev_by_index(&init_net, imr->imr_ifindex);
1408                 if (idev)
1409                         __in_dev_put(idev);
1410                 return idev;
1411         }
1412         if (imr->imr_address.s_addr) {
1413                 dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
1414                 if (!dev)
1415                         return NULL;
1416                 dev_put(dev);
1417         }
1418
1419         if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) {
1420                 dev = rt->u.dst.dev;
1421                 ip_rt_put(rt);
1422         }
1423         if (dev) {
1424                 imr->imr_ifindex = dev->ifindex;
1425                 idev = __in_dev_get_rtnl(dev);
1426         }
1427         return idev;
1428 }
1429
1430 /*
1431  *      Join a socket to a group
1432  */
1433 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1434 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1435
1436
1437 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1438         __be32 *psfsrc)
1439 {
1440         struct ip_sf_list *psf, *psf_prev;
1441         int rv = 0;
1442
1443         psf_prev = NULL;
1444         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1445                 if (psf->sf_inaddr == *psfsrc)
1446                         break;
1447                 psf_prev = psf;
1448         }
1449         if (!psf || psf->sf_count[sfmode] == 0) {
1450                 /* source filter not found, or count wrong =>  bug */
1451                 return -ESRCH;
1452         }
1453         psf->sf_count[sfmode]--;
1454         if (psf->sf_count[sfmode] == 0) {
1455                 ip_rt_multicast_event(pmc->interface);
1456         }
1457         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1458 #ifdef CONFIG_IP_MULTICAST
1459                 struct in_device *in_dev = pmc->interface;
1460 #endif
1461
1462                 /* no more filters for this source */
1463                 if (psf_prev)
1464                         psf_prev->sf_next = psf->sf_next;
1465                 else
1466                         pmc->sources = psf->sf_next;
1467 #ifdef CONFIG_IP_MULTICAST
1468                 if (psf->sf_oldin &&
1469                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1470                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1471                                 IGMP_Unsolicited_Report_Count;
1472                         psf->sf_next = pmc->tomb;
1473                         pmc->tomb = psf;
1474                         rv = 1;
1475                 } else
1476 #endif
1477                         kfree(psf);
1478         }
1479         return rv;
1480 }
1481
1482 #ifndef CONFIG_IP_MULTICAST
1483 #define igmp_ifc_event(x)       do { } while (0)
1484 #endif
1485
1486 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1487                          int sfcount, __be32 *psfsrc, int delta)
1488 {
1489         struct ip_mc_list *pmc;
1490         int     changerec = 0;
1491         int     i, err;
1492
1493         if (!in_dev)
1494                 return -ENODEV;
1495         read_lock(&in_dev->mc_list_lock);
1496         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1497                 if (*pmca == pmc->multiaddr)
1498                         break;
1499         }
1500         if (!pmc) {
1501                 /* MCA not found?? bug */
1502                 read_unlock(&in_dev->mc_list_lock);
1503                 return -ESRCH;
1504         }
1505         spin_lock_bh(&pmc->lock);
1506         read_unlock(&in_dev->mc_list_lock);
1507 #ifdef CONFIG_IP_MULTICAST
1508         sf_markstate(pmc);
1509 #endif
1510         if (!delta) {
1511                 err = -EINVAL;
1512                 if (!pmc->sfcount[sfmode])
1513                         goto out_unlock;
1514                 pmc->sfcount[sfmode]--;
1515         }
1516         err = 0;
1517         for (i=0; i<sfcount; i++) {
1518                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1519
1520                 changerec |= rv > 0;
1521                 if (!err && rv < 0)
1522                         err = rv;
1523         }
1524         if (pmc->sfmode == MCAST_EXCLUDE &&
1525             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1526             pmc->sfcount[MCAST_INCLUDE]) {
1527 #ifdef CONFIG_IP_MULTICAST
1528                 struct ip_sf_list *psf;
1529 #endif
1530
1531                 /* filter mode change */
1532                 pmc->sfmode = MCAST_INCLUDE;
1533 #ifdef CONFIG_IP_MULTICAST
1534                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1535                         IGMP_Unsolicited_Report_Count;
1536                 in_dev->mr_ifc_count = pmc->crcount;
1537                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1538                         psf->sf_crcount = 0;
1539                 igmp_ifc_event(pmc->interface);
1540         } else if (sf_setstate(pmc) || changerec) {
1541                 igmp_ifc_event(pmc->interface);
1542 #endif
1543         }
1544 out_unlock:
1545         spin_unlock_bh(&pmc->lock);
1546         return err;
1547 }
1548
1549 /*
1550  * Add multicast single-source filter to the interface list
1551  */
1552 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1553         __be32 *psfsrc, int delta)
1554 {
1555         struct ip_sf_list *psf, *psf_prev;
1556
1557         psf_prev = NULL;
1558         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1559                 if (psf->sf_inaddr == *psfsrc)
1560                         break;
1561                 psf_prev = psf;
1562         }
1563         if (!psf) {
1564                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1565                 if (!psf)
1566                         return -ENOBUFS;
1567                 psf->sf_inaddr = *psfsrc;
1568                 if (psf_prev) {
1569                         psf_prev->sf_next = psf;
1570                 } else
1571                         pmc->sources = psf;
1572         }
1573         psf->sf_count[sfmode]++;
1574         if (psf->sf_count[sfmode] == 1) {
1575                 ip_rt_multicast_event(pmc->interface);
1576         }
1577         return 0;
1578 }
1579
1580 #ifdef CONFIG_IP_MULTICAST
1581 static void sf_markstate(struct ip_mc_list *pmc)
1582 {
1583         struct ip_sf_list *psf;
1584         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1585
1586         for (psf=pmc->sources; psf; psf=psf->sf_next)
1587                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1588                         psf->sf_oldin = mca_xcount ==
1589                                 psf->sf_count[MCAST_EXCLUDE] &&
1590                                 !psf->sf_count[MCAST_INCLUDE];
1591                 } else
1592                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1593 }
1594
1595 static int sf_setstate(struct ip_mc_list *pmc)
1596 {
1597         struct ip_sf_list *psf, *dpsf;
1598         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1599         int qrv = pmc->interface->mr_qrv;
1600         int new_in, rv;
1601
1602         rv = 0;
1603         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1604                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1605                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1606                                 !psf->sf_count[MCAST_INCLUDE];
1607                 } else
1608                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1609                 if (new_in) {
1610                         if (!psf->sf_oldin) {
1611                                 struct ip_sf_list *prev = NULL;
1612
1613                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1614                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1615                                                 break;
1616                                         prev = dpsf;
1617                                 }
1618                                 if (dpsf) {
1619                                         if (prev)
1620                                                 prev->sf_next = dpsf->sf_next;
1621                                         else
1622                                                 pmc->tomb = dpsf->sf_next;
1623                                         kfree(dpsf);
1624                                 }
1625                                 psf->sf_crcount = qrv;
1626                                 rv++;
1627                         }
1628                 } else if (psf->sf_oldin) {
1629
1630                         psf->sf_crcount = 0;
1631                         /*
1632                          * add or update "delete" records if an active filter
1633                          * is now inactive
1634                          */
1635                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1636                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1637                                         break;
1638                         if (!dpsf) {
1639                                 dpsf = (struct ip_sf_list *)
1640                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1641                                 if (!dpsf)
1642                                         continue;
1643                                 *dpsf = *psf;
1644                                 /* pmc->lock held by callers */
1645                                 dpsf->sf_next = pmc->tomb;
1646                                 pmc->tomb = dpsf;
1647                         }
1648                         dpsf->sf_crcount = qrv;
1649                         rv++;
1650                 }
1651         }
1652         return rv;
1653 }
1654 #endif
1655
1656 /*
1657  * Add multicast source filter list to the interface list
1658  */
1659 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1660                          int sfcount, __be32 *psfsrc, int delta)
1661 {
1662         struct ip_mc_list *pmc;
1663         int     isexclude;
1664         int     i, err;
1665
1666         if (!in_dev)
1667                 return -ENODEV;
1668         read_lock(&in_dev->mc_list_lock);
1669         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1670                 if (*pmca == pmc->multiaddr)
1671                         break;
1672         }
1673         if (!pmc) {
1674                 /* MCA not found?? bug */
1675                 read_unlock(&in_dev->mc_list_lock);
1676                 return -ESRCH;
1677         }
1678         spin_lock_bh(&pmc->lock);
1679         read_unlock(&in_dev->mc_list_lock);
1680
1681 #ifdef CONFIG_IP_MULTICAST
1682         sf_markstate(pmc);
1683 #endif
1684         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1685         if (!delta)
1686                 pmc->sfcount[sfmode]++;
1687         err = 0;
1688         for (i=0; i<sfcount; i++) {
1689                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1690                 if (err)
1691                         break;
1692         }
1693         if (err) {
1694                 int j;
1695
1696                 pmc->sfcount[sfmode]--;
1697                 for (j=0; j<i; j++)
1698                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1699         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1700 #ifdef CONFIG_IP_MULTICAST
1701                 struct ip_sf_list *psf;
1702                 in_dev = pmc->interface;
1703 #endif
1704
1705                 /* filter mode change */
1706                 if (pmc->sfcount[MCAST_EXCLUDE])
1707                         pmc->sfmode = MCAST_EXCLUDE;
1708                 else if (pmc->sfcount[MCAST_INCLUDE])
1709                         pmc->sfmode = MCAST_INCLUDE;
1710 #ifdef CONFIG_IP_MULTICAST
1711                 /* else no filters; keep old mode for reports */
1712
1713                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1714                         IGMP_Unsolicited_Report_Count;
1715                 in_dev->mr_ifc_count = pmc->crcount;
1716                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1717                         psf->sf_crcount = 0;
1718                 igmp_ifc_event(in_dev);
1719         } else if (sf_setstate(pmc)) {
1720                 igmp_ifc_event(in_dev);
1721 #endif
1722         }
1723         spin_unlock_bh(&pmc->lock);
1724         return err;
1725 }
1726
1727 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1728 {
1729         struct ip_sf_list *psf, *nextpsf;
1730
1731         for (psf=pmc->tomb; psf; psf=nextpsf) {
1732                 nextpsf = psf->sf_next;
1733                 kfree(psf);
1734         }
1735         pmc->tomb = NULL;
1736         for (psf=pmc->sources; psf; psf=nextpsf) {
1737                 nextpsf = psf->sf_next;
1738                 kfree(psf);
1739         }
1740         pmc->sources = NULL;
1741         pmc->sfmode = MCAST_EXCLUDE;
1742         pmc->sfcount[MCAST_INCLUDE] = 0;
1743         pmc->sfcount[MCAST_EXCLUDE] = 1;
1744 }
1745
1746
1747 /*
1748  * Join a multicast group
1749  */
1750 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1751 {
1752         int err;
1753         __be32 addr = imr->imr_multiaddr.s_addr;
1754         struct ip_mc_socklist *iml=NULL, *i;
1755         struct in_device *in_dev;
1756         struct inet_sock *inet = inet_sk(sk);
1757         int ifindex;
1758         int count = 0;
1759
1760         if (!ipv4_is_multicast(addr))
1761                 return -EINVAL;
1762
1763         if (!net_eq(sock_net(sk), &init_net))
1764                 return -EPROTONOSUPPORT;
1765
1766         rtnl_lock();
1767
1768         in_dev = ip_mc_find_dev(imr);
1769
1770         if (!in_dev) {
1771                 iml = NULL;
1772                 err = -ENODEV;
1773                 goto done;
1774         }
1775
1776         err = -EADDRINUSE;
1777         ifindex = imr->imr_ifindex;
1778         for (i = inet->mc_list; i; i = i->next) {
1779                 if (i->multi.imr_multiaddr.s_addr == addr &&
1780                     i->multi.imr_ifindex == ifindex)
1781                         goto done;
1782                 count++;
1783         }
1784         err = -ENOBUFS;
1785         if (count >= sysctl_igmp_max_memberships)
1786                 goto done;
1787         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1788         if (iml == NULL)
1789                 goto done;
1790
1791         memcpy(&iml->multi, imr, sizeof(*imr));
1792         iml->next = inet->mc_list;
1793         iml->sflist = NULL;
1794         iml->sfmode = MCAST_EXCLUDE;
1795         inet->mc_list = iml;
1796         ip_mc_inc_group(in_dev, addr);
1797         err = 0;
1798 done:
1799         rtnl_unlock();
1800         return err;
1801 }
1802
1803 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1804                            struct in_device *in_dev)
1805 {
1806         int err;
1807
1808         if (iml->sflist == NULL) {
1809                 /* any-source empty exclude case */
1810                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1811                         iml->sfmode, 0, NULL, 0);
1812         }
1813         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1814                         iml->sfmode, iml->sflist->sl_count,
1815                         iml->sflist->sl_addr, 0);
1816         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1817         iml->sflist = NULL;
1818         return err;
1819 }
1820
1821 /*
1822  *      Ask a socket to leave a group.
1823  */
1824
1825 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1826 {
1827         struct inet_sock *inet = inet_sk(sk);
1828         struct ip_mc_socklist *iml, **imlp;
1829         struct in_device *in_dev;
1830         __be32 group = imr->imr_multiaddr.s_addr;
1831         u32 ifindex;
1832         int ret = -EADDRNOTAVAIL;
1833
1834         if (!net_eq(sock_net(sk), &init_net))
1835                 return -EPROTONOSUPPORT;
1836
1837         rtnl_lock();
1838         in_dev = ip_mc_find_dev(imr);
1839         ifindex = imr->imr_ifindex;
1840         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1841                 if (iml->multi.imr_multiaddr.s_addr != group)
1842                         continue;
1843                 if (ifindex) {
1844                         if (iml->multi.imr_ifindex != ifindex)
1845                                 continue;
1846                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1847                                 iml->multi.imr_address.s_addr)
1848                         continue;
1849
1850                 (void) ip_mc_leave_src(sk, iml, in_dev);
1851
1852                 *imlp = iml->next;
1853
1854                 if (in_dev)
1855                         ip_mc_dec_group(in_dev, group);
1856                 rtnl_unlock();
1857                 sock_kfree_s(sk, iml, sizeof(*iml));
1858                 return 0;
1859         }
1860         if (!in_dev)
1861                 ret = -ENODEV;
1862         rtnl_unlock();
1863         return ret;
1864 }
1865
1866 int ip_mc_source(int add, int omode, struct sock *sk, struct
1867         ip_mreq_source *mreqs, int ifindex)
1868 {
1869         int err;
1870         struct ip_mreqn imr;
1871         __be32 addr = mreqs->imr_multiaddr;
1872         struct ip_mc_socklist *pmc;
1873         struct in_device *in_dev = NULL;
1874         struct inet_sock *inet = inet_sk(sk);
1875         struct ip_sf_socklist *psl;
1876         int leavegroup = 0;
1877         int i, j, rv;
1878
1879         if (!ipv4_is_multicast(addr))
1880                 return -EINVAL;
1881
1882         if (!net_eq(sock_net(sk), &init_net))
1883                 return -EPROTONOSUPPORT;
1884
1885         rtnl_lock();
1886
1887         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1888         imr.imr_address.s_addr = mreqs->imr_interface;
1889         imr.imr_ifindex = ifindex;
1890         in_dev = ip_mc_find_dev(&imr);
1891
1892         if (!in_dev) {
1893                 err = -ENODEV;
1894                 goto done;
1895         }
1896         err = -EADDRNOTAVAIL;
1897
1898         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1899                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1900                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1901                         break;
1902         }
1903         if (!pmc) {             /* must have a prior join */
1904                 err = -EINVAL;
1905                 goto done;
1906         }
1907         /* if a source filter was set, must be the same mode as before */
1908         if (pmc->sflist) {
1909                 if (pmc->sfmode != omode) {
1910                         err = -EINVAL;
1911                         goto done;
1912                 }
1913         } else if (pmc->sfmode != omode) {
1914                 /* allow mode switches for empty-set filters */
1915                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1916                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1917                         NULL, 0);
1918                 pmc->sfmode = omode;
1919         }
1920
1921         psl = pmc->sflist;
1922         if (!add) {
1923                 if (!psl)
1924                         goto done;      /* err = -EADDRNOTAVAIL */
1925                 rv = !0;
1926                 for (i=0; i<psl->sl_count; i++) {
1927                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1928                                 sizeof(__be32));
1929                         if (rv == 0)
1930                                 break;
1931                 }
1932                 if (rv)         /* source not found */
1933                         goto done;      /* err = -EADDRNOTAVAIL */
1934
1935                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1936                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1937                         leavegroup = 1;
1938                         goto done;
1939                 }
1940
1941                 /* update the interface filter */
1942                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1943                         &mreqs->imr_sourceaddr, 1);
1944
1945                 for (j=i+1; j<psl->sl_count; j++)
1946                         psl->sl_addr[j-1] = psl->sl_addr[j];
1947                 psl->sl_count--;
1948                 err = 0;
1949                 goto done;
1950         }
1951         /* else, add a new source to the filter */
1952
1953         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1954                 err = -ENOBUFS;
1955                 goto done;
1956         }
1957         if (!psl || psl->sl_count == psl->sl_max) {
1958                 struct ip_sf_socklist *newpsl;
1959                 int count = IP_SFBLOCK;
1960
1961                 if (psl)
1962                         count += psl->sl_max;
1963                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1964                 if (!newpsl) {
1965                         err = -ENOBUFS;
1966                         goto done;
1967                 }
1968                 newpsl->sl_max = count;
1969                 newpsl->sl_count = count - IP_SFBLOCK;
1970                 if (psl) {
1971                         for (i=0; i<psl->sl_count; i++)
1972                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1973                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1974                 }
1975                 pmc->sflist = psl = newpsl;
1976         }
1977         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1978         for (i=0; i<psl->sl_count; i++) {
1979                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1980                         sizeof(__be32));
1981                 if (rv == 0)
1982                         break;
1983         }
1984         if (rv == 0)            /* address already there is an error */
1985                 goto done;
1986         for (j=psl->sl_count-1; j>=i; j--)
1987                 psl->sl_addr[j+1] = psl->sl_addr[j];
1988         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1989         psl->sl_count++;
1990         err = 0;
1991         /* update the interface list */
1992         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1993                 &mreqs->imr_sourceaddr, 1);
1994 done:
1995         rtnl_unlock();
1996         if (leavegroup)
1997                 return ip_mc_leave_group(sk, &imr);
1998         return err;
1999 }
2000
2001 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2002 {
2003         int err = 0;
2004         struct ip_mreqn imr;
2005         __be32 addr = msf->imsf_multiaddr;
2006         struct ip_mc_socklist *pmc;
2007         struct in_device *in_dev;
2008         struct inet_sock *inet = inet_sk(sk);
2009         struct ip_sf_socklist *newpsl, *psl;
2010         int leavegroup = 0;
2011
2012         if (!ipv4_is_multicast(addr))
2013                 return -EINVAL;
2014         if (msf->imsf_fmode != MCAST_INCLUDE &&
2015             msf->imsf_fmode != MCAST_EXCLUDE)
2016                 return -EINVAL;
2017
2018         if (!net_eq(sock_net(sk), &init_net))
2019                 return -EPROTONOSUPPORT;
2020
2021         rtnl_lock();
2022
2023         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2024         imr.imr_address.s_addr = msf->imsf_interface;
2025         imr.imr_ifindex = ifindex;
2026         in_dev = ip_mc_find_dev(&imr);
2027
2028         if (!in_dev) {
2029                 err = -ENODEV;
2030                 goto done;
2031         }
2032
2033         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2034         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2035                 leavegroup = 1;
2036                 goto done;
2037         }
2038
2039         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2040                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2041                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2042                         break;
2043         }
2044         if (!pmc) {             /* must have a prior join */
2045                 err = -EINVAL;
2046                 goto done;
2047         }
2048         if (msf->imsf_numsrc) {
2049                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2050                                                            GFP_KERNEL);
2051                 if (!newpsl) {
2052                         err = -ENOBUFS;
2053                         goto done;
2054                 }
2055                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2056                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2057                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2058                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2059                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2060                 if (err) {
2061                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2062                         goto done;
2063                 }
2064         } else {
2065                 newpsl = NULL;
2066                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2067                                      msf->imsf_fmode, 0, NULL, 0);
2068         }
2069         psl = pmc->sflist;
2070         if (psl) {
2071                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2072                         psl->sl_count, psl->sl_addr, 0);
2073                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2074         } else
2075                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2076                         0, NULL, 0);
2077         pmc->sflist = newpsl;
2078         pmc->sfmode = msf->imsf_fmode;
2079         err = 0;
2080 done:
2081         rtnl_unlock();
2082         if (leavegroup)
2083                 err = ip_mc_leave_group(sk, &imr);
2084         return err;
2085 }
2086
2087 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2088         struct ip_msfilter __user *optval, int __user *optlen)
2089 {
2090         int err, len, count, copycount;
2091         struct ip_mreqn imr;
2092         __be32 addr = msf->imsf_multiaddr;
2093         struct ip_mc_socklist *pmc;
2094         struct in_device *in_dev;
2095         struct inet_sock *inet = inet_sk(sk);
2096         struct ip_sf_socklist *psl;
2097
2098         if (!ipv4_is_multicast(addr))
2099                 return -EINVAL;
2100
2101         if (!net_eq(sock_net(sk), &init_net))
2102                 return -EPROTONOSUPPORT;
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(&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         if (!net_eq(sock_net(sk), &init_net))
2167                 return -EPROTONOSUPPORT;
2168
2169         rtnl_lock();
2170
2171         err = -EADDRNOTAVAIL;
2172
2173         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2174                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2175                     pmc->multi.imr_ifindex == gsf->gf_interface)
2176                         break;
2177         }
2178         if (!pmc)               /* must have a prior join */
2179                 goto done;
2180         gsf->gf_fmode = pmc->sfmode;
2181         psl = pmc->sflist;
2182         rtnl_unlock();
2183         count = psl ? psl->sl_count : 0;
2184         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2185         gsf->gf_numsrc = count;
2186         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2187             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2188                 return -EFAULT;
2189         }
2190         for (i=0; i<copycount; i++) {
2191                 struct sockaddr_storage ss;
2192
2193                 psin = (struct sockaddr_in *)&ss;
2194                 memset(&ss, 0, sizeof(ss));
2195                 psin->sin_family = AF_INET;
2196                 psin->sin_addr.s_addr = psl->sl_addr[i];
2197                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2198                         return -EFAULT;
2199         }
2200         return 0;
2201 done:
2202         rtnl_unlock();
2203         return err;
2204 }
2205
2206 /*
2207  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2208  */
2209 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2210 {
2211         struct inet_sock *inet = inet_sk(sk);
2212         struct ip_mc_socklist *pmc;
2213         struct ip_sf_socklist *psl;
2214         int i;
2215
2216         if (!ipv4_is_multicast(loc_addr))
2217                 return 1;
2218
2219         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2220                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2221                     pmc->multi.imr_ifindex == dif)
2222                         break;
2223         }
2224         if (!pmc)
2225                 return 1;
2226         psl = pmc->sflist;
2227         if (!psl)
2228                 return pmc->sfmode == MCAST_EXCLUDE;
2229
2230         for (i=0; i<psl->sl_count; i++) {
2231                 if (psl->sl_addr[i] == rmt_addr)
2232                         break;
2233         }
2234         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2235                 return 0;
2236         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2237                 return 0;
2238         return 1;
2239 }
2240
2241 /*
2242  *      A socket is closing.
2243  */
2244
2245 void ip_mc_drop_socket(struct sock *sk)
2246 {
2247         struct inet_sock *inet = inet_sk(sk);
2248         struct ip_mc_socklist *iml;
2249
2250         if (inet->mc_list == NULL)
2251                 return;
2252
2253         if (!net_eq(sock_net(sk), &init_net))
2254                 return;
2255
2256         rtnl_lock();
2257         while ((iml = inet->mc_list) != NULL) {
2258                 struct in_device *in_dev;
2259                 inet->mc_list = iml->next;
2260
2261                 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex);
2262                 (void) ip_mc_leave_src(sk, iml, in_dev);
2263                 if (in_dev != NULL) {
2264                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2265                         in_dev_put(in_dev);
2266                 }
2267                 sock_kfree_s(sk, iml, sizeof(*iml));
2268         }
2269         rtnl_unlock();
2270 }
2271
2272 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2273 {
2274         struct ip_mc_list *im;
2275         struct ip_sf_list *psf;
2276         int rv = 0;
2277
2278         read_lock(&in_dev->mc_list_lock);
2279         for (im=in_dev->mc_list; im; im=im->next) {
2280                 if (im->multiaddr == mc_addr)
2281                         break;
2282         }
2283         if (im && proto == IPPROTO_IGMP) {
2284                 rv = 1;
2285         } else if (im) {
2286                 if (src_addr) {
2287                         for (psf=im->sources; psf; psf=psf->sf_next) {
2288                                 if (psf->sf_inaddr == src_addr)
2289                                         break;
2290                         }
2291                         if (psf)
2292                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2293                                         psf->sf_count[MCAST_EXCLUDE] !=
2294                                         im->sfcount[MCAST_EXCLUDE];
2295                         else
2296                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2297                 } else
2298                         rv = 1; /* unspecified source; tentatively allow */
2299         }
2300         read_unlock(&in_dev->mc_list_lock);
2301         return rv;
2302 }
2303
2304 #if defined(CONFIG_PROC_FS)
2305 struct igmp_mc_iter_state {
2306         struct net_device *dev;
2307         struct in_device *in_dev;
2308 };
2309
2310 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2311
2312 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2313 {
2314         struct ip_mc_list *im = NULL;
2315         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2316
2317         state->in_dev = NULL;
2318         for_each_netdev(&init_net, state->dev) {
2319                 struct in_device *in_dev;
2320                 in_dev = in_dev_get(state->dev);
2321                 if (!in_dev)
2322                         continue;
2323                 read_lock(&in_dev->mc_list_lock);
2324                 im = in_dev->mc_list;
2325                 if (im) {
2326                         state->in_dev = in_dev;
2327                         break;
2328                 }
2329                 read_unlock(&in_dev->mc_list_lock);
2330                 in_dev_put(in_dev);
2331         }
2332         return im;
2333 }
2334
2335 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2336 {
2337         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2338         im = im->next;
2339         while (!im) {
2340                 if (likely(state->in_dev != NULL)) {
2341                         read_unlock(&state->in_dev->mc_list_lock);
2342                         in_dev_put(state->in_dev);
2343                 }
2344                 state->dev = next_net_device(state->dev);
2345                 if (!state->dev) {
2346                         state->in_dev = NULL;
2347                         break;
2348                 }
2349                 state->in_dev = in_dev_get(state->dev);
2350                 if (!state->in_dev)
2351                         continue;
2352                 read_lock(&state->in_dev->mc_list_lock);
2353                 im = state->in_dev->mc_list;
2354         }
2355         return im;
2356 }
2357
2358 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2359 {
2360         struct ip_mc_list *im = igmp_mc_get_first(seq);
2361         if (im)
2362                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2363                         --pos;
2364         return pos ? NULL : im;
2365 }
2366
2367 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2368         __acquires(dev_base_lock)
2369 {
2370         read_lock(&dev_base_lock);
2371         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2372 }
2373
2374 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2375 {
2376         struct ip_mc_list *im;
2377         if (v == SEQ_START_TOKEN)
2378                 im = igmp_mc_get_first(seq);
2379         else
2380                 im = igmp_mc_get_next(seq, v);
2381         ++*pos;
2382         return im;
2383 }
2384
2385 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2386         __releases(dev_base_lock)
2387 {
2388         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2389         if (likely(state->in_dev != NULL)) {
2390                 read_unlock(&state->in_dev->mc_list_lock);
2391                 in_dev_put(state->in_dev);
2392                 state->in_dev = NULL;
2393         }
2394         state->dev = NULL;
2395         read_unlock(&dev_base_lock);
2396 }
2397
2398 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2399 {
2400         if (v == SEQ_START_TOKEN)
2401                 seq_puts(seq,
2402                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2403         else {
2404                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2405                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2406                 char   *querier;
2407 #ifdef CONFIG_IP_MULTICAST
2408                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2409                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2410                           "V3";
2411 #else
2412                 querier = "NONE";
2413 #endif
2414
2415                 if (state->in_dev->mc_list == im) {
2416                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2417                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2418                 }
2419
2420                 seq_printf(seq,
2421                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2422                            im->multiaddr, im->users,
2423                            im->tm_running, im->tm_running ?
2424                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2425                            im->reporter);
2426         }
2427         return 0;
2428 }
2429
2430 static const struct seq_operations igmp_mc_seq_ops = {
2431         .start  =       igmp_mc_seq_start,
2432         .next   =       igmp_mc_seq_next,
2433         .stop   =       igmp_mc_seq_stop,
2434         .show   =       igmp_mc_seq_show,
2435 };
2436
2437 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2438 {
2439         return seq_open_private(file, &igmp_mc_seq_ops,
2440                         sizeof(struct igmp_mc_iter_state));
2441 }
2442
2443 static const struct file_operations igmp_mc_seq_fops = {
2444         .owner          =       THIS_MODULE,
2445         .open           =       igmp_mc_seq_open,
2446         .read           =       seq_read,
2447         .llseek         =       seq_lseek,
2448         .release        =       seq_release_private,
2449 };
2450
2451 struct igmp_mcf_iter_state {
2452         struct net_device *dev;
2453         struct in_device *idev;
2454         struct ip_mc_list *im;
2455 };
2456
2457 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2458
2459 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2460 {
2461         struct ip_sf_list *psf = NULL;
2462         struct ip_mc_list *im = NULL;
2463         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2464
2465         state->idev = NULL;
2466         state->im = NULL;
2467         for_each_netdev(&init_net, state->dev) {
2468                 struct in_device *idev;
2469                 idev = in_dev_get(state->dev);
2470                 if (unlikely(idev == NULL))
2471                         continue;
2472                 read_lock(&idev->mc_list_lock);
2473                 im = idev->mc_list;
2474                 if (likely(im != NULL)) {
2475                         spin_lock_bh(&im->lock);
2476                         psf = im->sources;
2477                         if (likely(psf != NULL)) {
2478                                 state->im = im;
2479                                 state->idev = idev;
2480                                 break;
2481                         }
2482                         spin_unlock_bh(&im->lock);
2483                 }
2484                 read_unlock(&idev->mc_list_lock);
2485                 in_dev_put(idev);
2486         }
2487         return psf;
2488 }
2489
2490 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2491 {
2492         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2493
2494         psf = psf->sf_next;
2495         while (!psf) {
2496                 spin_unlock_bh(&state->im->lock);
2497                 state->im = state->im->next;
2498                 while (!state->im) {
2499                         if (likely(state->idev != NULL)) {
2500                                 read_unlock(&state->idev->mc_list_lock);
2501                                 in_dev_put(state->idev);
2502                         }
2503                         state->dev = next_net_device(state->dev);
2504                         if (!state->dev) {
2505                                 state->idev = NULL;
2506                                 goto out;
2507                         }
2508                         state->idev = in_dev_get(state->dev);
2509                         if (!state->idev)
2510                                 continue;
2511                         read_lock(&state->idev->mc_list_lock);
2512                         state->im = state->idev->mc_list;
2513                 }
2514                 if (!state->im)
2515                         break;
2516                 spin_lock_bh(&state->im->lock);
2517                 psf = state->im->sources;
2518         }
2519 out:
2520         return psf;
2521 }
2522
2523 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2524 {
2525         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2526         if (psf)
2527                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2528                         --pos;
2529         return pos ? NULL : psf;
2530 }
2531
2532 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2533 {
2534         read_lock(&dev_base_lock);
2535         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2536 }
2537
2538 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2539 {
2540         struct ip_sf_list *psf;
2541         if (v == SEQ_START_TOKEN)
2542                 psf = igmp_mcf_get_first(seq);
2543         else
2544                 psf = igmp_mcf_get_next(seq, v);
2545         ++*pos;
2546         return psf;
2547 }
2548
2549 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2550 {
2551         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2552         if (likely(state->im != NULL)) {
2553                 spin_unlock_bh(&state->im->lock);
2554                 state->im = NULL;
2555         }
2556         if (likely(state->idev != NULL)) {
2557                 read_unlock(&state->idev->mc_list_lock);
2558                 in_dev_put(state->idev);
2559                 state->idev = NULL;
2560         }
2561         state->dev = NULL;
2562         read_unlock(&dev_base_lock);
2563 }
2564
2565 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2566 {
2567         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2568         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2569
2570         if (v == SEQ_START_TOKEN) {
2571                 seq_printf(seq,
2572                            "%3s %6s "
2573                            "%10s %10s %6s %6s\n", "Idx",
2574                            "Device", "MCA",
2575                            "SRC", "INC", "EXC");
2576         } else {
2577                 seq_printf(seq,
2578                            "%3d %6.6s 0x%08x "
2579                            "0x%08x %6lu %6lu\n",
2580                            state->dev->ifindex, state->dev->name,
2581                            ntohl(state->im->multiaddr),
2582                            ntohl(psf->sf_inaddr),
2583                            psf->sf_count[MCAST_INCLUDE],
2584                            psf->sf_count[MCAST_EXCLUDE]);
2585         }
2586         return 0;
2587 }
2588
2589 static const struct seq_operations igmp_mcf_seq_ops = {
2590         .start  =       igmp_mcf_seq_start,
2591         .next   =       igmp_mcf_seq_next,
2592         .stop   =       igmp_mcf_seq_stop,
2593         .show   =       igmp_mcf_seq_show,
2594 };
2595
2596 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2597 {
2598         return seq_open_private(file, &igmp_mcf_seq_ops,
2599                         sizeof(struct igmp_mcf_iter_state));
2600 }
2601
2602 static const struct file_operations igmp_mcf_seq_fops = {
2603         .owner          =       THIS_MODULE,
2604         .open           =       igmp_mcf_seq_open,
2605         .read           =       seq_read,
2606         .llseek         =       seq_lseek,
2607         .release        =       seq_release_private,
2608 };
2609
2610 int __init igmp_mc_proc_init(void)
2611 {
2612         proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2613         proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2614         return 0;
2615 }
2616 #endif
2617
2618 EXPORT_SYMBOL(ip_mc_dec_group);
2619 EXPORT_SYMBOL(ip_mc_inc_group);
2620 EXPORT_SYMBOL(ip_mc_join_group);
2621 EXPORT_SYMBOL(ip_mc_rejoin_group);