net/ipv4/igmp.c

   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Authors:
  12  *              Alan Cox <alan@lxorguk.ukuu.org.uk>
  13  *
  14  *      This program is free software; you can redistribute it and/or
  15  *      modify it under the terms of the GNU General Public License
  16  *      as published by the Free Software Foundation; either version
  17  *      2 of the License, or (at your option) any later version.
  18  *
  19  *      Fixes:
  20  *
  21  *              Alan Cox        :       Added lots of __inline__ to optimise
  22  *                                      the memory usage of all the tiny little
  23  *                                      functions.
  24  *              Alan Cox        :       Dumped the header building experiment.
  25  *              Alan Cox        :       Minor tweaks ready for multicast routing
  26  *                                      and extended IGMP protocol.
  27  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  28  *                                      writes utterly bogus code otherwise (sigh)
  29  *                                      fixed IGMP loopback to behave in the manner
  30  *                                      desired by mrouted, fixed the fact it has been
  31  *                                      broken since 1.3.6 and cleaned up a few minor
  32  *                                      points.
  33  *
  34  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  35  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  36  *                                      The enhancements are mainly based on Steve Deering's
  37  *                                      ipmulti-3.5 source code.
  38  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  39  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  40  *                                      the mrouted version on that device.
  41  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  42  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  43  *                                      to identify the multicast router version
  44  *                                      and do what the IGMP version 2 specified.
  45  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  46  *              Tsu-Sheng Tsao          if the specified time expired.
  47  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  48  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  49  *              Christian Daudt :       igmp timer wasn't set for local group
  50  *                                      memberships but was being deleted,
  51  *                                      which caused a "del_timer() called
  52  *                                      from %p with timer not initialized\n"
  53  *                                      message (960131).
  54  *              Christian Daudt :       removed del_timer from
  55  *                                      igmp_timer_expire function (960205).
  56  *             Christian Daudt :       igmp_heard_report now only calls
  57  *                                     igmp_timer_expire if tm->running is
  58  *                                     true (960216).
  59  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  60  *                                      igmp_heard_query never trigger. Expiry
  61  *                                      miscalculation fixed in igmp_heard_query
  62  *                                      and random() made to return unsigned to
  63  *                                      prevent negative expiry times.
  64  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  65  *                                      fix from pending 2.1.x patches.
  66  *              Alan Cox:               Forget to enable FDDI support earlier.
  67  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  68  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  69  *              David L Stevens:        IGMPv3 support, with help from
  70  *                                      Vinay Kulkarni
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/slab.h>
  75 #include <asm/uaccess.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 #include <linux/pkt_sched.h>
  92
  93 #include <net/net_namespace.h>
  94 #include <net/arp.h>
  95 #include <net/ip.h>
  96 #include <net/protocol.h>
  97 #include <net/route.h>
  98 #include <net/sock.h>
  99 #include <net/checksum.h>
 100 #include <linux/netfilter_ipv4.h>
 101 #ifdef CONFIG_IP_MROUTE
 102 #include <linux/mroute.h>
 103 #endif
 104 #ifdef CONFIG_PROC_FS
 105 #include <linux/proc_fs.h>
 106 #include <linux/seq_file.h>
 107 #endif
 108
 109 #define IP_MAX_MEMBERSHIPS      20
 110 #define IP_MAX_MSF              10
 111
 112 #ifdef CONFIG_IP_MULTICAST
 113 /* Parameter names and values are taken from igmp-v2-06 draft */
 114
 115 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 116 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 117 #define IGMP_V2_Unsolicited_Report_Interval     (10*HZ)
 118 #define IGMP_V3_Unsolicited_Report_Interval     (1*HZ)
 119 #define IGMP_Query_Response_Interval            (10*HZ)
 120 #define IGMP_Unsolicited_Report_Count           2
 121
 122
 123 #define IGMP_Initial_Report_Delay               (1)
 124
 125 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 126  * IGMP specs require to report membership immediately after
 127  * joining a group, but we delay the first report by a
 128  * small interval. It seems more natural and still does not
 129  * contradict to specs provided this delay is small enough.
 130  */
 131
 132 #define IGMP_V1_SEEN(in_dev) \
 133         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 134          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 135          ((in_dev)->mr_v1_seen && \
 136           time_before(jiffies, (in_dev)->mr_v1_seen)))
 137 #define IGMP_V2_SEEN(in_dev) \
 138         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 139          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 140          ((in_dev)->mr_v2_seen && \
 141           time_before(jiffies, (in_dev)->mr_v2_seen)))
 142
 143 static int unsolicited_report_interval(struct in_device *in_dev)
 144 {
 145         int interval_ms, interval_jiffies;
 146
 147         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 148                 interval_ms = IN_DEV_CONF_GET(
 149                         in_dev,
 150                         IGMPV2_UNSOLICITED_REPORT_INTERVAL);
 151         else /* v3 */
 152                 interval_ms = IN_DEV_CONF_GET(
 153                         in_dev,
 154                         IGMPV3_UNSOLICITED_REPORT_INTERVAL);
 155
 156         interval_jiffies = msecs_to_jiffies(interval_ms);
 157
 158         /* _timer functions can't handle a delay of 0 jiffies so ensure
 159          *  we always return a positive value.
 160          */
 161         if (interval_jiffies <= 0)
 162                 interval_jiffies = 1;
 163         return interval_jiffies;
 164 }
 165
 166 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 167 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 168 static void igmpv3_clear_delrec(struct in_device *in_dev);
 169 static int sf_setstate(struct ip_mc_list *pmc);
 170 static void sf_markstate(struct ip_mc_list *pmc);
 171 #endif
 172 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 173 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 174                          int sfcount, __be32 *psfsrc, int delta);
 175
 176 static void ip_ma_put(struct ip_mc_list *im)
 177 {
 178         if (atomic_dec_and_test(&im->refcnt)) {
 179                 in_dev_put(im->interface);
 180                 kfree_rcu(im, rcu);
 181         }
 182 }
 183
 184 #define for_each_pmc_rcu(in_dev, pmc)                           \
 185         for (pmc = rcu_dereference(in_dev->mc_list);            \
 186              pmc != NULL;                                       \
 187              pmc = rcu_dereference(pmc->next_rcu))
 188
 189 #define for_each_pmc_rtnl(in_dev, pmc)                          \
 190         for (pmc = rtnl_dereference(in_dev->mc_list);           \
 191              pmc != NULL;                                       \
 192              pmc = rtnl_dereference(pmc->next_rcu))
 193
 194 #ifdef CONFIG_IP_MULTICAST
 195
 196 /*
 197  *      Timer management
 198  */
 199
 200 static void igmp_stop_timer(struct ip_mc_list *im)
 201 {
 202         spin_lock_bh(&im->lock);
 203         if (del_timer(&im->timer))
 204                 atomic_dec(&im->refcnt);
 205         im->tm_running = 0;
 206         im->reporter = 0;
 207         im->unsolicit_count = 0;
 208         spin_unlock_bh(&im->lock);
 209 }
 210
 211 /* It must be called with locked im->lock */
 212 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 213 {
 214         int tv = net_random() % max_delay;
 215
 216         im->tm_running = 1;
 217         if (!mod_timer(&im->timer, jiffies+tv+2))
 218                 atomic_inc(&im->refcnt);
 219 }
 220
 221 static void igmp_gq_start_timer(struct in_device *in_dev)
 222 {
 223         int tv = net_random() % in_dev->mr_maxdelay;
 224
 225         in_dev->mr_gq_running = 1;
 226         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 227                 in_dev_hold(in_dev);
 228 }
 229
 230 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 231 {
 232         int tv = net_random() % delay;
 233
 234         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 235                 in_dev_hold(in_dev);
 236 }
 237
 238 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 239 {
 240         spin_lock_bh(&im->lock);
 241         im->unsolicit_count = 0;
 242         if (del_timer(&im->timer)) {
 243                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 244                         add_timer(&im->timer);
 245                         im->tm_running = 1;
 246                         spin_unlock_bh(&im->lock);
 247                         return;
 248                 }
 249                 atomic_dec(&im->refcnt);
 250         }
 251         igmp_start_timer(im, max_delay);
 252         spin_unlock_bh(&im->lock);
 253 }
 254
 255
 256 /*
 257  *      Send an IGMP report.
 258  */
 259
 260 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 261
 262
 263 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 264         int gdeleted, int sdeleted)
 265 {
 266         switch (type) {
 267         case IGMPV3_MODE_IS_INCLUDE:
 268         case IGMPV3_MODE_IS_EXCLUDE:
 269                 if (gdeleted || sdeleted)
 270                         return 0;
 271                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 272                         if (pmc->sfmode == MCAST_INCLUDE)
 273                                 return 1;
 274                         /* don't include if this source is excluded
 275                          * in all filters
 276                          */
 277                         if (psf->sf_count[MCAST_INCLUDE])
 278                                 return type == IGMPV3_MODE_IS_INCLUDE;
 279                         return pmc->sfcount[MCAST_EXCLUDE] ==
 280                                 psf->sf_count[MCAST_EXCLUDE];
 281                 }
 282                 return 0;
 283         case IGMPV3_CHANGE_TO_INCLUDE:
 284                 if (gdeleted || sdeleted)
 285                         return 0;
 286                 return psf->sf_count[MCAST_INCLUDE] != 0;
 287         case IGMPV3_CHANGE_TO_EXCLUDE:
 288                 if (gdeleted || sdeleted)
 289                         return 0;
 290                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 291                     psf->sf_count[MCAST_INCLUDE])
 292                         return 0;
 293                 return pmc->sfcount[MCAST_EXCLUDE] ==
 294                         psf->sf_count[MCAST_EXCLUDE];
 295         case IGMPV3_ALLOW_NEW_SOURCES:
 296                 if (gdeleted || !psf->sf_crcount)
 297                         return 0;
 298                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 299         case IGMPV3_BLOCK_OLD_SOURCES:
 300                 if (pmc->sfmode == MCAST_INCLUDE)
 301                         return gdeleted || (psf->sf_crcount && sdeleted);
 302                 return psf->sf_crcount && !gdeleted && !sdeleted;
 303         }
 304         return 0;
 305 }
 306
 307 static int
 308 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 309 {
 310         struct ip_sf_list *psf;
 311         int scount = 0;
 312
 313         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 314                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 315                         continue;
 316                 scount++;
 317         }
 318         return scount;
 319 }
 320
 321 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
 322
 323 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 324 {
 325         struct sk_buff *skb;
 326         struct rtable *rt;
 327         struct iphdr *pip;
 328         struct igmpv3_report *pig;
 329         struct net *net = dev_net(dev);
 330         struct flowi4 fl4;
 331         int hlen = LL_RESERVED_SPACE(dev);
 332         int tlen = dev->needed_tailroom;
 333
 334         while (1) {
 335                 skb = alloc_skb(size + hlen + tlen,
 336                                 GFP_ATOMIC | __GFP_NOWARN);
 337                 if (skb)
 338                         break;
 339                 size >>= 1;
 340                 if (size < 256)
 341                         return NULL;
 342         }
 343         skb->priority = TC_PRIO_CONTROL;
 344         igmp_skb_size(skb) = size;
 345
 346         rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
 347                                    0, 0,
 348                                    IPPROTO_IGMP, 0, dev->ifindex);
 349         if (IS_ERR(rt)) {
 350                 kfree_skb(skb);
 351                 return NULL;
 352         }
 353
 354         skb_dst_set(skb, &rt->dst);
 355         skb->dev = dev;
 356
 357         skb_reserve(skb, hlen);
 358
 359         skb_reset_network_header(skb);
 360         pip = ip_hdr(skb);
 361         skb_put(skb, sizeof(struct iphdr) + 4);
 362
 363         pip->version  = 4;
 364         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 365         pip->tos      = 0xc0;
 366         pip->frag_off = htons(IP_DF);
 367         pip->ttl      = 1;
 368         pip->daddr    = fl4.daddr;
 369         pip->saddr    = fl4.saddr;
 370         pip->protocol = IPPROTO_IGMP;
 371         pip->tot_len  = 0;      /* filled in later */
 372         ip_select_ident(skb, &rt->dst, NULL);
 373         ((u8 *)&pip[1])[0] = IPOPT_RA;
 374         ((u8 *)&pip[1])[1] = 4;
 375         ((u8 *)&pip[1])[2] = 0;
 376         ((u8 *)&pip[1])[3] = 0;
 377
 378         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 379         skb_put(skb, sizeof(*pig));
 380         pig = igmpv3_report_hdr(skb);
 381         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 382         pig->resv1 = 0;
 383         pig->csum = 0;
 384         pig->resv2 = 0;
 385         pig->ngrec = 0;
 386         return skb;
 387 }
 388
 389 static int igmpv3_sendpack(struct sk_buff *skb)
 390 {
 391         struct igmphdr *pig = igmp_hdr(skb);
 392         const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
 393
 394         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 395
 396         return ip_local_out(skb);
 397 }
 398
 399 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 400 {
 401         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
 402 }
 403
 404 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 405         int type, struct igmpv3_grec **ppgr)
 406 {
 407         struct net_device *dev = pmc->interface->dev;
 408         struct igmpv3_report *pih;
 409         struct igmpv3_grec *pgr;
 410
 411         if (!skb)
 412                 skb = igmpv3_newpack(dev, dev->mtu);
 413         if (!skb)
 414                 return NULL;
 415         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 416         pgr->grec_type = type;
 417         pgr->grec_auxwords = 0;
 418         pgr->grec_nsrcs = 0;
 419         pgr->grec_mca = pmc->multiaddr;
 420         pih = igmpv3_report_hdr(skb);
 421         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 422         *ppgr = pgr;
 423         return skb;
 424 }
 425
 426 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
 427         skb_tailroom(skb)) : 0)
 428
 429 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 430         int type, int gdeleted, int sdeleted)
 431 {
 432         struct net_device *dev = pmc->interface->dev;
 433         struct igmpv3_report *pih;
 434         struct igmpv3_grec *pgr = NULL;
 435         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 436         int scount, stotal, first, isquery, truncate;
 437
 438         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 439                 return skb;
 440
 441         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 442                   type == IGMPV3_MODE_IS_EXCLUDE;
 443         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 444                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 445
 446         stotal = scount = 0;
 447
 448         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 449
 450         if (!*psf_list)
 451                 goto empty_source;
 452
 453         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 454
 455         /* EX and TO_EX get a fresh packet, if needed */
 456         if (truncate) {
 457                 if (pih && pih->ngrec &&
 458                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 459                         if (skb)
 460                                 igmpv3_sendpack(skb);
 461                         skb = igmpv3_newpack(dev, dev->mtu);
 462                 }
 463         }
 464         first = 1;
 465         psf_prev = NULL;
 466         for (psf=*psf_list; psf; psf=psf_next) {
 467                 __be32 *psrc;
 468
 469                 psf_next = psf->sf_next;
 470
 471                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 472                         psf_prev = psf;
 473                         continue;
 474                 }
 475
 476                 /* clear marks on query responses */
 477                 if (isquery)
 478                         psf->sf_gsresp = 0;
 479
 480                 if (AVAILABLE(skb) < sizeof(__be32) +
 481                     first*sizeof(struct igmpv3_grec)) {
 482                         if (truncate && !first)
 483                                 break;   /* truncate these */
 484                         if (pgr)
 485                                 pgr->grec_nsrcs = htons(scount);
 486                         if (skb)
 487                                 igmpv3_sendpack(skb);
 488                         skb = igmpv3_newpack(dev, dev->mtu);
 489                         first = 1;
 490                         scount = 0;
 491                 }
 492                 if (first) {
 493                         skb = add_grhead(skb, pmc, type, &pgr);
 494                         first = 0;
 495                 }
 496                 if (!skb)
 497                         return NULL;
 498                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 499                 *psrc = psf->sf_inaddr;
 500                 scount++; stotal++;
 501                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 502                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 503                         psf->sf_crcount--;
 504                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 505                                 if (psf_prev)
 506                                         psf_prev->sf_next = psf->sf_next;
 507                                 else
 508                                         *psf_list = psf->sf_next;
 509                                 kfree(psf);
 510                                 continue;
 511                         }
 512                 }
 513                 psf_prev = psf;
 514         }
 515
 516 empty_source:
 517         if (!stotal) {
 518                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 519                     type == IGMPV3_BLOCK_OLD_SOURCES)
 520                         return skb;
 521                 if (pmc->crcount || isquery) {
 522                         /* make sure we have room for group header */
 523                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 524                                 igmpv3_sendpack(skb);
 525                                 skb = NULL; /* add_grhead will get a new one */
 526                         }
 527                         skb = add_grhead(skb, pmc, type, &pgr);
 528                 }
 529         }
 530         if (pgr)
 531                 pgr->grec_nsrcs = htons(scount);
 532
 533         if (isquery)
 534                 pmc->gsquery = 0;       /* clear query state on report */
 535         return skb;
 536 }
 537
 538 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 539 {
 540         struct sk_buff *skb = NULL;
 541         int type;
 542
 543         if (!pmc) {
 544                 rcu_read_lock();
 545                 for_each_pmc_rcu(in_dev, pmc) {
 546                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 547                                 continue;
 548                         spin_lock_bh(&pmc->lock);
 549                         if (pmc->sfcount[MCAST_EXCLUDE])
 550                                 type = IGMPV3_MODE_IS_EXCLUDE;
 551                         else
 552                                 type = IGMPV3_MODE_IS_INCLUDE;
 553                         skb = add_grec(skb, pmc, type, 0, 0);
 554                         spin_unlock_bh(&pmc->lock);
 555                 }
 556                 rcu_read_unlock();
 557         } else {
 558                 spin_lock_bh(&pmc->lock);
 559                 if (pmc->sfcount[MCAST_EXCLUDE])
 560                         type = IGMPV3_MODE_IS_EXCLUDE;
 561                 else
 562                         type = IGMPV3_MODE_IS_INCLUDE;
 563                 skb = add_grec(skb, pmc, type, 0, 0);
 564                 spin_unlock_bh(&pmc->lock);
 565         }
 566         if (!skb)
 567                 return 0;
 568         return igmpv3_sendpack(skb);
 569 }
 570
 571 /*
 572  * remove zero-count source records from a source filter list
 573  */
 574 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 575 {
 576         struct ip_sf_list *psf_prev, *psf_next, *psf;
 577
 578         psf_prev = NULL;
 579         for (psf=*ppsf; psf; psf = psf_next) {
 580                 psf_next = psf->sf_next;
 581                 if (psf->sf_crcount == 0) {
 582                         if (psf_prev)
 583                                 psf_prev->sf_next = psf->sf_next;
 584                         else
 585                                 *ppsf = psf->sf_next;
 586                         kfree(psf);
 587                 } else
 588                         psf_prev = psf;
 589         }
 590 }
 591
 592 static void igmpv3_send_cr(struct in_device *in_dev)
 593 {
 594         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 595         struct sk_buff *skb = NULL;
 596         int type, dtype;
 597
 598         rcu_read_lock();
 599         spin_lock_bh(&in_dev->mc_tomb_lock);
 600
 601         /* deleted MCA's */
 602         pmc_prev = NULL;
 603         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 604                 pmc_next = pmc->next;
 605                 if (pmc->sfmode == MCAST_INCLUDE) {
 606                         type = IGMPV3_BLOCK_OLD_SOURCES;
 607                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 608                         skb = add_grec(skb, pmc, type, 1, 0);
 609                         skb = add_grec(skb, pmc, dtype, 1, 1);
 610                 }
 611                 if (pmc->crcount) {
 612                         if (pmc->sfmode == MCAST_EXCLUDE) {
 613                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 614                                 skb = add_grec(skb, pmc, type, 1, 0);
 615                         }
 616                         pmc->crcount--;
 617                         if (pmc->crcount == 0) {
 618                                 igmpv3_clear_zeros(&pmc->tomb);
 619                                 igmpv3_clear_zeros(&pmc->sources);
 620                         }
 621                 }
 622                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 623                         if (pmc_prev)
 624                                 pmc_prev->next = pmc_next;
 625                         else
 626                                 in_dev->mc_tomb = pmc_next;
 627                         in_dev_put(pmc->interface);
 628                         kfree(pmc);
 629                 } else
 630                         pmc_prev = pmc;
 631         }
 632         spin_unlock_bh(&in_dev->mc_tomb_lock);
 633
 634         /* change recs */
 635         for_each_pmc_rcu(in_dev, pmc) {
 636                 spin_lock_bh(&pmc->lock);
 637                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 638                         type = IGMPV3_BLOCK_OLD_SOURCES;
 639                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 640                 } else {
 641                         type = IGMPV3_ALLOW_NEW_SOURCES;
 642                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 643                 }
 644                 skb = add_grec(skb, pmc, type, 0, 0);
 645                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 646
 647                 /* filter mode changes */
 648                 if (pmc->crcount) {
 649                         if (pmc->sfmode == MCAST_EXCLUDE)
 650                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 651                         else
 652                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 653                         skb = add_grec(skb, pmc, type, 0, 0);
 654                         pmc->crcount--;
 655                 }
 656                 spin_unlock_bh(&pmc->lock);
 657         }
 658         rcu_read_unlock();
 659
 660         if (!skb)
 661                 return;
 662         (void) igmpv3_sendpack(skb);
 663 }
 664
 665 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 666         int type)
 667 {
 668         struct sk_buff *skb;
 669         struct iphdr *iph;
 670         struct igmphdr *ih;
 671         struct rtable *rt;
 672         struct net_device *dev = in_dev->dev;
 673         struct net *net = dev_net(dev);
 674         __be32  group = pmc ? pmc->multiaddr : 0;
 675         struct flowi4 fl4;
 676         __be32  dst;
 677         int hlen, tlen;
 678
 679         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 680                 return igmpv3_send_report(in_dev, pmc);
 681         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 682                 dst = IGMP_ALL_ROUTER;
 683         else
 684                 dst = group;
 685
 686         rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
 687                                    0, 0,
 688                                    IPPROTO_IGMP, 0, dev->ifindex);
 689         if (IS_ERR(rt))
 690                 return -1;
 691
 692         hlen = LL_RESERVED_SPACE(dev);
 693         tlen = dev->needed_tailroom;
 694         skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
 695         if (skb == NULL) {
 696                 ip_rt_put(rt);
 697                 return -1;
 698         }
 699         skb->priority = TC_PRIO_CONTROL;
 700
 701         skb_dst_set(skb, &rt->dst);
 702
 703         skb_reserve(skb, hlen);
 704
 705         skb_reset_network_header(skb);
 706         iph = ip_hdr(skb);
 707         skb_put(skb, sizeof(struct iphdr) + 4);
 708
 709         iph->version  = 4;
 710         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 711         iph->tos      = 0xc0;
 712         iph->frag_off = htons(IP_DF);
 713         iph->ttl      = 1;
 714         iph->daddr    = dst;
 715         iph->saddr    = fl4.saddr;
 716         iph->protocol = IPPROTO_IGMP;
 717         ip_select_ident(skb, &rt->dst, NULL);
 718         ((u8 *)&iph[1])[0] = IPOPT_RA;
 719         ((u8 *)&iph[1])[1] = 4;
 720         ((u8 *)&iph[1])[2] = 0;
 721         ((u8 *)&iph[1])[3] = 0;
 722
 723         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 724         ih->type = type;
 725         ih->code = 0;
 726         ih->csum = 0;
 727         ih->group = group;
 728         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 729
 730         return ip_local_out(skb);
 731 }
 732
 733 static void igmp_gq_timer_expire(unsigned long data)
 734 {
 735         struct in_device *in_dev = (struct in_device *)data;
 736
 737         in_dev->mr_gq_running = 0;
 738         igmpv3_send_report(in_dev, NULL);
 739         __in_dev_put(in_dev);
 740 }
 741
 742 static void igmp_ifc_timer_expire(unsigned long data)
 743 {
 744         struct in_device *in_dev = (struct in_device *)data;
 745
 746         igmpv3_send_cr(in_dev);
 747         if (in_dev->mr_ifc_count) {
 748                 in_dev->mr_ifc_count--;
 749                 igmp_ifc_start_timer(in_dev,
 750                                      unsolicited_report_interval(in_dev));
 751         }
 752         __in_dev_put(in_dev);
 753 }
 754
 755 static void igmp_ifc_event(struct in_device *in_dev)
 756 {
 757         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 758                 return;
 759         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 760                 IGMP_Unsolicited_Report_Count;
 761         igmp_ifc_start_timer(in_dev, 1);
 762 }
 763
 764
 765 static void igmp_timer_expire(unsigned long data)
 766 {
 767         struct ip_mc_list *im=(struct ip_mc_list *)data;
 768         struct in_device *in_dev = im->interface;
 769
 770         spin_lock(&im->lock);
 771         im->tm_running = 0;
 772
 773         if (im->unsolicit_count) {
 774                 im->unsolicit_count--;
 775                 igmp_start_timer(im, unsolicited_report_interval(in_dev));
 776         }
 777         im->reporter = 1;
 778         spin_unlock(&im->lock);
 779
 780         if (IGMP_V1_SEEN(in_dev))
 781                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 782         else if (IGMP_V2_SEEN(in_dev))
 783                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 784         else
 785                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 786
 787         ip_ma_put(im);
 788 }
 789
 790 /* mark EXCLUDE-mode sources */
 791 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 792 {
 793         struct ip_sf_list *psf;
 794         int i, scount;
 795
 796         scount = 0;
 797         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 798                 if (scount == nsrcs)
 799                         break;
 800                 for (i=0; i<nsrcs; i++) {
 801                         /* skip inactive filters */
 802                         if (psf->sf_count[MCAST_INCLUDE] ||
 803                             pmc->sfcount[MCAST_EXCLUDE] !=
 804                             psf->sf_count[MCAST_EXCLUDE])
 805                                 break;
 806                         if (srcs[i] == psf->sf_inaddr) {
 807                                 scount++;
 808                                 break;
 809                         }
 810                 }
 811         }
 812         pmc->gsquery = 0;
 813         if (scount == nsrcs)    /* all sources excluded */
 814                 return 0;
 815         return 1;
 816 }
 817
 818 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 819 {
 820         struct ip_sf_list *psf;
 821         int i, scount;
 822
 823         if (pmc->sfmode == MCAST_EXCLUDE)
 824                 return igmp_xmarksources(pmc, nsrcs, srcs);
 825
 826         /* mark INCLUDE-mode sources */
 827         scount = 0;
 828         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 829                 if (scount == nsrcs)
 830                         break;
 831                 for (i=0; i<nsrcs; i++)
 832                         if (srcs[i] == psf->sf_inaddr) {
 833                                 psf->sf_gsresp = 1;
 834                                 scount++;
 835                                 break;
 836                         }
 837         }
 838         if (!scount) {
 839                 pmc->gsquery = 0;
 840                 return 0;
 841         }
 842         pmc->gsquery = 1;
 843         return 1;
 844 }
 845
 846 /* return true if packet was dropped */
 847 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
 848 {
 849         struct ip_mc_list *im;
 850
 851         /* Timers are only set for non-local groups */
 852
 853         if (group == IGMP_ALL_HOSTS)
 854                 return false;
 855
 856         rcu_read_lock();
 857         for_each_pmc_rcu(in_dev, im) {
 858                 if (im->multiaddr == group) {
 859                         igmp_stop_timer(im);
 860                         break;
 861                 }
 862         }
 863         rcu_read_unlock();
 864         return false;
 865 }
 866
 867 /* return true if packet was dropped */
 868 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 869         int len)
 870 {
 871         struct igmphdr          *ih = igmp_hdr(skb);
 872         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 873         struct ip_mc_list       *im;
 874         __be32                  group = ih->group;
 875         int                     max_delay;
 876         int                     mark = 0;
 877
 878
 879         if (len == 8) {
 880                 if (ih->code == 0) {
 881                         /* Alas, old v1 router presents here. */
 882
 883                         max_delay = IGMP_Query_Response_Interval;
 884                         in_dev->mr_v1_seen = jiffies +
 885                                 IGMP_V1_Router_Present_Timeout;
 886                         group = 0;
 887                 } else {
 888                         /* v2 router present */
 889                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 890                         in_dev->mr_v2_seen = jiffies +
 891                                 IGMP_V2_Router_Present_Timeout;
 892                 }
 893                 /* cancel the interface change timer */
 894                 in_dev->mr_ifc_count = 0;
 895                 if (del_timer(&in_dev->mr_ifc_timer))
 896                         __in_dev_put(in_dev);
 897                 /* clear deleted report items */
 898                 igmpv3_clear_delrec(in_dev);
 899         } else if (len < 12) {
 900                 return true;    /* ignore bogus packet; freed by caller */
 901         } else if (IGMP_V1_SEEN(in_dev)) {
 902                 /* This is a v3 query with v1 queriers present */
 903                 max_delay = IGMP_Query_Response_Interval;
 904                 group = 0;
 905         } else if (IGMP_V2_SEEN(in_dev)) {
 906                 /* this is a v3 query with v2 queriers present;
 907                  * Interpretation of the max_delay code is problematic here.
 908                  * A real v2 host would use ih_code directly, while v3 has a
 909                  * different encoding. We use the v3 encoding as more likely
 910                  * to be intended in a v3 query.
 911                  */
 912                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 913                 if (!max_delay)
 914                         max_delay = 1;  /* can't mod w/ 0 */
 915         } else { /* v3 */
 916                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 917                         return true;
 918
 919                 ih3 = igmpv3_query_hdr(skb);
 920                 if (ih3->nsrcs) {
 921                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 922                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 923                                 return true;
 924                         ih3 = igmpv3_query_hdr(skb);
 925                 }
 926
 927                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 928                 if (!max_delay)
 929                         max_delay = 1;  /* can't mod w/ 0 */
 930                 in_dev->mr_maxdelay = max_delay;
 931                 if (ih3->qrv)
 932                         in_dev->mr_qrv = ih3->qrv;
 933                 if (!group) { /* general query */
 934                         if (ih3->nsrcs)
 935                                 return false;   /* no sources allowed */
 936                         igmp_gq_start_timer(in_dev);
 937                         return false;
 938                 }
 939                 /* mark sources to include, if group & source-specific */
 940                 mark = ih3->nsrcs != 0;
 941         }
 942
 943         /*
 944          * - Start the timers in all of our membership records
 945          *   that the query applies to for the interface on
 946          *   which the query arrived excl. those that belong
 947          *   to a "local" group (224.0.0.X)
 948          * - For timers already running check if they need to
 949          *   be reset.
 950          * - Use the igmp->igmp_code field as the maximum
 951          *   delay possible
 952          */
 953         rcu_read_lock();
 954         for_each_pmc_rcu(in_dev, im) {
 955                 int changed;
 956
 957                 if (group && group != im->multiaddr)
 958                         continue;
 959                 if (im->multiaddr == IGMP_ALL_HOSTS)
 960                         continue;
 961                 spin_lock_bh(&im->lock);
 962                 if (im->tm_running)
 963                         im->gsquery = im->gsquery && mark;
 964                 else
 965                         im->gsquery = mark;
 966                 changed = !im->gsquery ||
 967                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 968                 spin_unlock_bh(&im->lock);
 969                 if (changed)
 970                         igmp_mod_timer(im, max_delay);
 971         }
 972         rcu_read_unlock();
 973         return false;
 974 }
 975
 976 /* called in rcu_read_lock() section */
 977 int igmp_rcv(struct sk_buff *skb)
 978 {
 979         /* This basically follows the spec line by line -- see RFC1112 */
 980         struct igmphdr *ih;
 981         struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
 982         int len = skb->len;
 983         bool dropped = true;
 984
 985         if (in_dev == NULL)
 986                 goto drop;
 987
 988         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 989                 goto drop;
 990
 991         switch (skb->ip_summed) {
 992         case CHECKSUM_COMPLETE:
 993                 if (!csum_fold(skb->csum))
 994                         break;
 995                 /* fall through */
 996         case CHECKSUM_NONE:
 997                 skb->csum = 0;
 998                 if (__skb_checksum_complete(skb))
 999                         goto drop;
1000         }
1001
1002         ih = igmp_hdr(skb);
1003         switch (ih->type) {
1004         case IGMP_HOST_MEMBERSHIP_QUERY:
1005                 dropped = igmp_heard_query(in_dev, skb, len);
1006                 break;
1007         case IGMP_HOST_MEMBERSHIP_REPORT:
1008         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1009                 /* Is it our report looped back? */
1010                 if (rt_is_output_route(skb_rtable(skb)))
1011                         break;
1012                 /* don't rely on MC router hearing unicast reports */
1013                 if (skb->pkt_type == PACKET_MULTICAST ||
1014                     skb->pkt_type == PACKET_BROADCAST)
1015                         dropped = igmp_heard_report(in_dev, ih->group);
1016                 break;
1017         case IGMP_PIM:
1018 #ifdef CONFIG_IP_PIMSM_V1
1019                 return pim_rcv_v1(skb);
1020 #endif
1021         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1022         case IGMP_DVMRP:
1023         case IGMP_TRACE:
1024         case IGMP_HOST_LEAVE_MESSAGE:
1025         case IGMP_MTRACE:
1026         case IGMP_MTRACE_RESP:
1027                 break;
1028         default:
1029                 break;
1030         }
1031
1032 drop:
1033         if (dropped)
1034                 kfree_skb(skb);
1035         else
1036                 consume_skb(skb);
1037         return 0;
1038 }
1039
1040 #endif
1041
1042
1043 /*
1044  *      Add a filter to a device
1045  */
1046
1047 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1048 {
1049         char buf[MAX_ADDR_LEN];
1050         struct net_device *dev = in_dev->dev;
1051
1052         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1053            We will get multicast token leakage, when IFF_MULTICAST
1054            is changed. This check should be done in ndo_set_rx_mode
1055            routine. Something sort of:
1056            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1057            --ANK
1058            */
1059         if (arp_mc_map(addr, buf, dev, 0) == 0)
1060                 dev_mc_add(dev, buf);
1061 }
1062
1063 /*
1064  *      Remove a filter from a device
1065  */
1066
1067 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1068 {
1069         char buf[MAX_ADDR_LEN];
1070         struct net_device *dev = in_dev->dev;
1071
1072         if (arp_mc_map(addr, buf, dev, 0) == 0)
1073                 dev_mc_del(dev, buf);
1074 }
1075
1076 #ifdef CONFIG_IP_MULTICAST
1077 /*
1078  * deleted ip_mc_list manipulation
1079  */
1080 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1081 {
1082         struct ip_mc_list *pmc;
1083
1084         /* this is an "ip_mc_list" for convenience; only the fields below
1085          * are actually used. In particular, the refcnt and users are not
1086          * used for management of the delete list. Using the same structure
1087          * for deleted items allows change reports to use common code with
1088          * non-deleted or query-response MCA's.
1089          */
1090         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1091         if (!pmc)
1092                 return;
1093         spin_lock_bh(&im->lock);
1094         pmc->interface = im->interface;
1095         in_dev_hold(in_dev);
1096         pmc->multiaddr = im->multiaddr;
1097         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1098                 IGMP_Unsolicited_Report_Count;
1099         pmc->sfmode = im->sfmode;
1100         if (pmc->sfmode == MCAST_INCLUDE) {
1101                 struct ip_sf_list *psf;
1102
1103                 pmc->tomb = im->tomb;
1104                 pmc->sources = im->sources;
1105                 im->tomb = im->sources = NULL;
1106                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1107                         psf->sf_crcount = pmc->crcount;
1108         }
1109         spin_unlock_bh(&im->lock);
1110
1111         spin_lock_bh(&in_dev->mc_tomb_lock);
1112         pmc->next = in_dev->mc_tomb;
1113         in_dev->mc_tomb = pmc;
1114         spin_unlock_bh(&in_dev->mc_tomb_lock);
1115 }
1116
1117 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1118 {
1119         struct ip_mc_list *pmc, *pmc_prev;
1120         struct ip_sf_list *psf, *psf_next;
1121
1122         spin_lock_bh(&in_dev->mc_tomb_lock);
1123         pmc_prev = NULL;
1124         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1125                 if (pmc->multiaddr == multiaddr)
1126                         break;
1127                 pmc_prev = pmc;
1128         }
1129         if (pmc) {
1130                 if (pmc_prev)
1131                         pmc_prev->next = pmc->next;
1132                 else
1133                         in_dev->mc_tomb = pmc->next;
1134         }
1135         spin_unlock_bh(&in_dev->mc_tomb_lock);
1136         if (pmc) {
1137                 for (psf=pmc->tomb; psf; psf=psf_next) {
1138                         psf_next = psf->sf_next;
1139                         kfree(psf);
1140                 }
1141                 in_dev_put(pmc->interface);
1142                 kfree(pmc);
1143         }
1144 }
1145
1146 static void igmpv3_clear_delrec(struct in_device *in_dev)
1147 {
1148         struct ip_mc_list *pmc, *nextpmc;
1149
1150         spin_lock_bh(&in_dev->mc_tomb_lock);
1151         pmc = in_dev->mc_tomb;
1152         in_dev->mc_tomb = NULL;
1153         spin_unlock_bh(&in_dev->mc_tomb_lock);
1154
1155         for (; pmc; pmc = nextpmc) {
1156                 nextpmc = pmc->next;
1157                 ip_mc_clear_src(pmc);
1158                 in_dev_put(pmc->interface);
1159                 kfree(pmc);
1160         }
1161         /* clear dead sources, too */
1162         rcu_read_lock();
1163         for_each_pmc_rcu(in_dev, pmc) {
1164                 struct ip_sf_list *psf, *psf_next;
1165
1166                 spin_lock_bh(&pmc->lock);
1167                 psf = pmc->tomb;
1168                 pmc->tomb = NULL;
1169                 spin_unlock_bh(&pmc->lock);
1170                 for (; psf; psf=psf_next) {
1171                         psf_next = psf->sf_next;
1172                         kfree(psf);
1173                 }
1174         }
1175         rcu_read_unlock();
1176 }
1177 #endif
1178
1179 static void igmp_group_dropped(struct ip_mc_list *im)
1180 {
1181         struct in_device *in_dev = im->interface;
1182 #ifdef CONFIG_IP_MULTICAST
1183         int reporter;
1184 #endif
1185
1186         if (im->loaded) {
1187                 im->loaded = 0;
1188                 ip_mc_filter_del(in_dev, im->multiaddr);
1189         }
1190
1191 #ifdef CONFIG_IP_MULTICAST
1192         if (im->multiaddr == IGMP_ALL_HOSTS)
1193                 return;
1194
1195         reporter = im->reporter;
1196         igmp_stop_timer(im);
1197
1198         if (!in_dev->dead) {
1199                 if (IGMP_V1_SEEN(in_dev))
1200                         return;
1201                 if (IGMP_V2_SEEN(in_dev)) {
1202                         if (reporter)
1203                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1204                         return;
1205                 }
1206                 /* IGMPv3 */
1207                 igmpv3_add_delrec(in_dev, im);
1208
1209                 igmp_ifc_event(in_dev);
1210         }
1211 #endif
1212 }
1213
1214 static void igmp_group_added(struct ip_mc_list *im)
1215 {
1216         struct in_device *in_dev = im->interface;
1217
1218         if (im->loaded == 0) {
1219                 im->loaded = 1;
1220                 ip_mc_filter_add(in_dev, im->multiaddr);
1221         }
1222
1223 #ifdef CONFIG_IP_MULTICAST
1224         if (im->multiaddr == IGMP_ALL_HOSTS)
1225                 return;
1226
1227         if (in_dev->dead)
1228                 return;
1229         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1230                 spin_lock_bh(&im->lock);
1231                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1232                 spin_unlock_bh(&im->lock);
1233                 return;
1234         }
1235         /* else, v3 */
1236
1237         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1238                 IGMP_Unsolicited_Report_Count;
1239         igmp_ifc_event(in_dev);
1240 #endif
1241 }
1242
1243
1244 /*
1245  *      Multicast list managers
1246  */
1247
1248 static u32 ip_mc_hash(const struct ip_mc_list *im)
1249 {
1250         return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1251 }
1252
1253 static void ip_mc_hash_add(struct in_device *in_dev,
1254                            struct ip_mc_list *im)
1255 {
1256         struct ip_mc_list __rcu **mc_hash;
1257         u32 hash;
1258
1259         mc_hash = rtnl_dereference(in_dev->mc_hash);
1260         if (mc_hash) {
1261                 hash = ip_mc_hash(im);
1262                 im->next_hash = mc_hash[hash];
1263                 rcu_assign_pointer(mc_hash[hash], im);
1264                 return;
1265         }
1266
1267         /* do not use a hash table for small number of items */
1268         if (in_dev->mc_count < 4)
1269                 return;
1270
1271         mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1272                           GFP_KERNEL);
1273         if (!mc_hash)
1274                 return;
1275
1276         for_each_pmc_rtnl(in_dev, im) {
1277                 hash = ip_mc_hash(im);
1278                 im->next_hash = mc_hash[hash];
1279                 RCU_INIT_POINTER(mc_hash[hash], im);
1280         }
1281
1282         rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1283 }
1284
1285 static void ip_mc_hash_remove(struct in_device *in_dev,
1286                               struct ip_mc_list *im)
1287 {
1288         struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1289         struct ip_mc_list *aux;
1290
1291         if (!mc_hash)
1292                 return;
1293         mc_hash += ip_mc_hash(im);
1294         while ((aux = rtnl_dereference(*mc_hash)) != im)
1295                 mc_hash = &aux->next_hash;
1296         *mc_hash = im->next_hash;
1297 }
1298
1299
1300 /*
1301  *      A socket has joined a multicast group on device dev.
1302  */
1303
1304 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1305 {
1306         struct ip_mc_list *im;
1307
1308         ASSERT_RTNL();
1309
1310         for_each_pmc_rtnl(in_dev, im) {
1311                 if (im->multiaddr == addr) {
1312                         im->users++;
1313                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1314                         goto out;
1315                 }
1316         }
1317
1318         im = kzalloc(sizeof(*im), GFP_KERNEL);
1319         if (!im)
1320                 goto out;
1321
1322         im->users = 1;
1323         im->interface = in_dev;
1324         in_dev_hold(in_dev);
1325         im->multiaddr = addr;
1326         /* initial mode is (EX, empty) */
1327         im->sfmode = MCAST_EXCLUDE;
1328         im->sfcount[MCAST_EXCLUDE] = 1;
1329         atomic_set(&im->refcnt, 1);
1330         spin_lock_init(&im->lock);
1331 #ifdef CONFIG_IP_MULTICAST
1332         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1333         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1334 #endif
1335
1336         im->next_rcu = in_dev->mc_list;
1337         in_dev->mc_count++;
1338         rcu_assign_pointer(in_dev->mc_list, im);
1339
1340         ip_mc_hash_add(in_dev, im);
1341
1342 #ifdef CONFIG_IP_MULTICAST
1343         igmpv3_del_delrec(in_dev, im->multiaddr);
1344 #endif
1345         igmp_group_added(im);
1346         if (!in_dev->dead)
1347                 ip_rt_multicast_event(in_dev);
1348 out:
1349         return;
1350 }
1351 EXPORT_SYMBOL(ip_mc_inc_group);
1352
1353 /*
1354  *      Resend IGMP JOIN report; used by netdev notifier.
1355  */
1356 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1357 {
1358 #ifdef CONFIG_IP_MULTICAST
1359         struct ip_mc_list *im;
1360         int type;
1361
1362         ASSERT_RTNL();
1363
1364         for_each_pmc_rtnl(in_dev, im) {
1365                 if (im->multiaddr == IGMP_ALL_HOSTS)
1366                         continue;
1367
1368                 /* a failover is happening and switches
1369                  * must be notified immediately
1370                  */
1371                 if (IGMP_V1_SEEN(in_dev))
1372                         type = IGMP_HOST_MEMBERSHIP_REPORT;
1373                 else if (IGMP_V2_SEEN(in_dev))
1374                         type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1375                 else
1376                         type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1377                 igmp_send_report(in_dev, im, type);
1378         }
1379 #endif
1380 }
1381
1382 /*
1383  *      A socket has left a multicast group on device dev
1384  */
1385
1386 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1387 {
1388         struct ip_mc_list *i;
1389         struct ip_mc_list __rcu **ip;
1390
1391         ASSERT_RTNL();
1392
1393         for (ip = &in_dev->mc_list;
1394              (i = rtnl_dereference(*ip)) != NULL;
1395              ip = &i->next_rcu) {
1396                 if (i->multiaddr == addr) {
1397                         if (--i->users == 0) {
1398                                 ip_mc_hash_remove(in_dev, i);
1399                                 *ip = i->next_rcu;
1400                                 in_dev->mc_count--;
1401                                 igmp_group_dropped(i);
1402                                 ip_mc_clear_src(i);
1403
1404                                 if (!in_dev->dead)
1405                                         ip_rt_multicast_event(in_dev);
1406
1407                                 ip_ma_put(i);
1408                                 return;
1409                         }
1410                         break;
1411                 }
1412         }
1413 }
1414 EXPORT_SYMBOL(ip_mc_dec_group);
1415
1416 /* Device changing type */
1417
1418 void ip_mc_unmap(struct in_device *in_dev)
1419 {
1420         struct ip_mc_list *pmc;
1421
1422         ASSERT_RTNL();
1423
1424         for_each_pmc_rtnl(in_dev, pmc)
1425                 igmp_group_dropped(pmc);
1426 }
1427
1428 void ip_mc_remap(struct in_device *in_dev)
1429 {
1430         struct ip_mc_list *pmc;
1431
1432         ASSERT_RTNL();
1433
1434         for_each_pmc_rtnl(in_dev, pmc)
1435                 igmp_group_added(pmc);
1436 }
1437
1438 /* Device going down */
1439
1440 void ip_mc_down(struct in_device *in_dev)
1441 {
1442         struct ip_mc_list *pmc;
1443
1444         ASSERT_RTNL();
1445
1446         for_each_pmc_rtnl(in_dev, pmc)
1447                 igmp_group_dropped(pmc);
1448
1449 #ifdef CONFIG_IP_MULTICAST
1450         in_dev->mr_ifc_count = 0;
1451         if (del_timer(&in_dev->mr_ifc_timer))
1452                 __in_dev_put(in_dev);
1453         in_dev->mr_gq_running = 0;
1454         if (del_timer(&in_dev->mr_gq_timer))
1455                 __in_dev_put(in_dev);
1456         igmpv3_clear_delrec(in_dev);
1457 #endif
1458
1459         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1460 }
1461
1462 void ip_mc_init_dev(struct in_device *in_dev)
1463 {
1464         ASSERT_RTNL();
1465
1466 #ifdef CONFIG_IP_MULTICAST
1467         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1468                         (unsigned long)in_dev);
1469         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1470                         (unsigned long)in_dev);
1471         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1472 #endif
1473
1474         spin_lock_init(&in_dev->mc_tomb_lock);
1475 }
1476
1477 /* Device going up */
1478
1479 void ip_mc_up(struct in_device *in_dev)
1480 {
1481         struct ip_mc_list *pmc;
1482
1483         ASSERT_RTNL();
1484
1485         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1486
1487         for_each_pmc_rtnl(in_dev, pmc)
1488                 igmp_group_added(pmc);
1489 }
1490
1491 /*
1492  *      Device is about to be destroyed: clean up.
1493  */
1494
1495 void ip_mc_destroy_dev(struct in_device *in_dev)
1496 {
1497         struct ip_mc_list *i;
1498
1499         ASSERT_RTNL();
1500
1501         /* Deactivate timers */
1502         ip_mc_down(in_dev);
1503
1504         while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1505                 in_dev->mc_list = i->next_rcu;
1506                 in_dev->mc_count--;
1507
1508                 /* We've dropped the groups in ip_mc_down already */
1509                 ip_mc_clear_src(i);
1510                 ip_ma_put(i);
1511         }
1512 }
1513
1514 /* RTNL is locked */
1515 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1516 {
1517         struct net_device *dev = NULL;
1518         struct in_device *idev = NULL;
1519
1520         if (imr->imr_ifindex) {
1521                 idev = inetdev_by_index(net, imr->imr_ifindex);
1522                 return idev;
1523         }
1524         if (imr->imr_address.s_addr) {
1525                 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1526                 if (!dev)
1527                         return NULL;
1528         }
1529
1530         if (!dev) {
1531                 struct rtable *rt = ip_route_output(net,
1532                                                     imr->imr_multiaddr.s_addr,
1533                                                     0, 0, 0);
1534                 if (!IS_ERR(rt)) {
1535                         dev = rt->dst.dev;
1536                         ip_rt_put(rt);
1537                 }
1538         }
1539         if (dev) {
1540                 imr->imr_ifindex = dev->ifindex;
1541                 idev = __in_dev_get_rtnl(dev);
1542         }
1543         return idev;
1544 }
1545
1546 /*
1547  *      Join a socket to a group
1548  */
1549 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1550 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1551
1552
1553 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1554         __be32 *psfsrc)
1555 {
1556         struct ip_sf_list *psf, *psf_prev;
1557         int rv = 0;
1558
1559         psf_prev = NULL;
1560         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1561                 if (psf->sf_inaddr == *psfsrc)
1562                         break;
1563                 psf_prev = psf;
1564         }
1565         if (!psf || psf->sf_count[sfmode] == 0) {
1566                 /* source filter not found, or count wrong =>  bug */
1567                 return -ESRCH;
1568         }
1569         psf->sf_count[sfmode]--;
1570         if (psf->sf_count[sfmode] == 0) {
1571                 ip_rt_multicast_event(pmc->interface);
1572         }
1573         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1574 #ifdef CONFIG_IP_MULTICAST
1575                 struct in_device *in_dev = pmc->interface;
1576 #endif
1577
1578                 /* no more filters for this source */
1579                 if (psf_prev)
1580                         psf_prev->sf_next = psf->sf_next;
1581                 else
1582                         pmc->sources = psf->sf_next;
1583 #ifdef CONFIG_IP_MULTICAST
1584                 if (psf->sf_oldin &&
1585                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1586                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1587                                 IGMP_Unsolicited_Report_Count;
1588                         psf->sf_next = pmc->tomb;
1589                         pmc->tomb = psf;
1590                         rv = 1;
1591                 } else
1592 #endif
1593                         kfree(psf);
1594         }
1595         return rv;
1596 }
1597
1598 #ifndef CONFIG_IP_MULTICAST
1599 #define igmp_ifc_event(x)       do { } while (0)
1600 #endif
1601
1602 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1603                          int sfcount, __be32 *psfsrc, int delta)
1604 {
1605         struct ip_mc_list *pmc;
1606         int     changerec = 0;
1607         int     i, err;
1608
1609         if (!in_dev)
1610                 return -ENODEV;
1611         rcu_read_lock();
1612         for_each_pmc_rcu(in_dev, pmc) {
1613                 if (*pmca == pmc->multiaddr)
1614                         break;
1615         }
1616         if (!pmc) {
1617                 /* MCA not found?? bug */
1618                 rcu_read_unlock();
1619                 return -ESRCH;
1620         }
1621         spin_lock_bh(&pmc->lock);
1622         rcu_read_unlock();
1623 #ifdef CONFIG_IP_MULTICAST
1624         sf_markstate(pmc);
1625 #endif
1626         if (!delta) {
1627                 err = -EINVAL;
1628                 if (!pmc->sfcount[sfmode])
1629                         goto out_unlock;
1630                 pmc->sfcount[sfmode]--;
1631         }
1632         err = 0;
1633         for (i=0; i<sfcount; i++) {
1634                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1635
1636                 changerec |= rv > 0;
1637                 if (!err && rv < 0)
1638                         err = rv;
1639         }
1640         if (pmc->sfmode == MCAST_EXCLUDE &&
1641             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1642             pmc->sfcount[MCAST_INCLUDE]) {
1643 #ifdef CONFIG_IP_MULTICAST
1644                 struct ip_sf_list *psf;
1645 #endif
1646
1647                 /* filter mode change */
1648                 pmc->sfmode = MCAST_INCLUDE;
1649 #ifdef CONFIG_IP_MULTICAST
1650                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1651                         IGMP_Unsolicited_Report_Count;
1652                 in_dev->mr_ifc_count = pmc->crcount;
1653                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1654                         psf->sf_crcount = 0;
1655                 igmp_ifc_event(pmc->interface);
1656         } else if (sf_setstate(pmc) || changerec) {
1657                 igmp_ifc_event(pmc->interface);
1658 #endif
1659         }
1660 out_unlock:
1661         spin_unlock_bh(&pmc->lock);
1662         return err;
1663 }
1664
1665 /*
1666  * Add multicast single-source filter to the interface list
1667  */
1668 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1669         __be32 *psfsrc)
1670 {
1671         struct ip_sf_list *psf, *psf_prev;
1672
1673         psf_prev = NULL;
1674         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1675                 if (psf->sf_inaddr == *psfsrc)
1676                         break;
1677                 psf_prev = psf;
1678         }
1679         if (!psf) {
1680                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1681                 if (!psf)
1682                         return -ENOBUFS;
1683                 psf->sf_inaddr = *psfsrc;
1684                 if (psf_prev) {
1685                         psf_prev->sf_next = psf;
1686                 } else
1687                         pmc->sources = psf;
1688         }
1689         psf->sf_count[sfmode]++;
1690         if (psf->sf_count[sfmode] == 1) {
1691                 ip_rt_multicast_event(pmc->interface);
1692         }
1693         return 0;
1694 }
1695
1696 #ifdef CONFIG_IP_MULTICAST
1697 static void sf_markstate(struct ip_mc_list *pmc)
1698 {
1699         struct ip_sf_list *psf;
1700         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1701
1702         for (psf=pmc->sources; psf; psf=psf->sf_next)
1703                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1704                         psf->sf_oldin = mca_xcount ==
1705                                 psf->sf_count[MCAST_EXCLUDE] &&
1706                                 !psf->sf_count[MCAST_INCLUDE];
1707                 } else
1708                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1709 }
1710
1711 static int sf_setstate(struct ip_mc_list *pmc)
1712 {
1713         struct ip_sf_list *psf, *dpsf;
1714         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1715         int qrv = pmc->interface->mr_qrv;
1716         int new_in, rv;
1717
1718         rv = 0;
1719         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1720                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1721                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1722                                 !psf->sf_count[MCAST_INCLUDE];
1723                 } else
1724                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1725                 if (new_in) {
1726                         if (!psf->sf_oldin) {
1727                                 struct ip_sf_list *prev = NULL;
1728
1729                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1730                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1731                                                 break;
1732                                         prev = dpsf;
1733                                 }
1734                                 if (dpsf) {
1735                                         if (prev)
1736                                                 prev->sf_next = dpsf->sf_next;
1737                                         else
1738                                                 pmc->tomb = dpsf->sf_next;
1739                                         kfree(dpsf);
1740                                 }
1741                                 psf->sf_crcount = qrv;
1742                                 rv++;
1743                         }
1744                 } else if (psf->sf_oldin) {
1745
1746                         psf->sf_crcount = 0;
1747                         /*
1748                          * add or update "delete" records if an active filter
1749                          * is now inactive
1750                          */
1751                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1752                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1753                                         break;
1754                         if (!dpsf) {
1755                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1756                                 if (!dpsf)
1757                                         continue;
1758                                 *dpsf = *psf;
1759                                 /* pmc->lock held by callers */
1760                                 dpsf->sf_next = pmc->tomb;
1761                                 pmc->tomb = dpsf;
1762                         }
1763                         dpsf->sf_crcount = qrv;
1764                         rv++;
1765                 }
1766         }
1767         return rv;
1768 }
1769 #endif
1770
1771 /*
1772  * Add multicast source filter list to the interface list
1773  */
1774 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1775                          int sfcount, __be32 *psfsrc, int delta)
1776 {
1777         struct ip_mc_list *pmc;
1778         int     isexclude;
1779         int     i, err;
1780
1781         if (!in_dev)
1782                 return -ENODEV;
1783         rcu_read_lock();
1784         for_each_pmc_rcu(in_dev, pmc) {
1785                 if (*pmca == pmc->multiaddr)
1786                         break;
1787         }
1788         if (!pmc) {
1789                 /* MCA not found?? bug */
1790                 rcu_read_unlock();
1791                 return -ESRCH;
1792         }
1793         spin_lock_bh(&pmc->lock);
1794         rcu_read_unlock();
1795
1796 #ifdef CONFIG_IP_MULTICAST
1797         sf_markstate(pmc);
1798 #endif
1799         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1800         if (!delta)
1801                 pmc->sfcount[sfmode]++;
1802         err = 0;
1803         for (i=0; i<sfcount; i++) {
1804                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1805                 if (err)
1806                         break;
1807         }
1808         if (err) {
1809                 int j;
1810
1811                 if (!delta)
1812                         pmc->sfcount[sfmode]--;
1813                 for (j=0; j<i; j++)
1814                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1815         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1816 #ifdef CONFIG_IP_MULTICAST
1817                 struct ip_sf_list *psf;
1818                 in_dev = pmc->interface;
1819 #endif
1820
1821                 /* filter mode change */
1822                 if (pmc->sfcount[MCAST_EXCLUDE])
1823                         pmc->sfmode = MCAST_EXCLUDE;
1824                 else if (pmc->sfcount[MCAST_INCLUDE])
1825                         pmc->sfmode = MCAST_INCLUDE;
1826 #ifdef CONFIG_IP_MULTICAST
1827                 /* else no filters; keep old mode for reports */
1828
1829                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1830                         IGMP_Unsolicited_Report_Count;
1831                 in_dev->mr_ifc_count = pmc->crcount;
1832                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1833                         psf->sf_crcount = 0;
1834                 igmp_ifc_event(in_dev);
1835         } else if (sf_setstate(pmc)) {
1836                 igmp_ifc_event(in_dev);
1837 #endif
1838         }
1839         spin_unlock_bh(&pmc->lock);
1840         return err;
1841 }
1842
1843 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1844 {
1845         struct ip_sf_list *psf, *nextpsf;
1846
1847         for (psf=pmc->tomb; psf; psf=nextpsf) {
1848                 nextpsf = psf->sf_next;
1849                 kfree(psf);
1850         }
1851         pmc->tomb = NULL;
1852         for (psf=pmc->sources; psf; psf=nextpsf) {
1853                 nextpsf = psf->sf_next;
1854                 kfree(psf);
1855         }
1856         pmc->sources = NULL;
1857         pmc->sfmode = MCAST_EXCLUDE;
1858         pmc->sfcount[MCAST_INCLUDE] = 0;
1859         pmc->sfcount[MCAST_EXCLUDE] = 1;
1860 }
1861
1862
1863 /*
1864  * Join a multicast group
1865  */
1866 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1867 {
1868         int err;
1869         __be32 addr = imr->imr_multiaddr.s_addr;
1870         struct ip_mc_socklist *iml = NULL, *i;
1871         struct in_device *in_dev;
1872         struct inet_sock *inet = inet_sk(sk);
1873         struct net *net = sock_net(sk);
1874         int ifindex;
1875         int count = 0;
1876
1877         if (!ipv4_is_multicast(addr))
1878                 return -EINVAL;
1879
1880         rtnl_lock();
1881
1882         in_dev = ip_mc_find_dev(net, imr);
1883
1884         if (!in_dev) {
1885                 iml = NULL;
1886                 err = -ENODEV;
1887                 goto done;
1888         }
1889
1890         err = -EADDRINUSE;
1891         ifindex = imr->imr_ifindex;
1892         for_each_pmc_rtnl(inet, i) {
1893                 if (i->multi.imr_multiaddr.s_addr == addr &&
1894                     i->multi.imr_ifindex == ifindex)
1895                         goto done;
1896                 count++;
1897         }
1898         err = -ENOBUFS;
1899         if (count >= sysctl_igmp_max_memberships)
1900                 goto done;
1901         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1902         if (iml == NULL)
1903                 goto done;
1904
1905         memcpy(&iml->multi, imr, sizeof(*imr));
1906         iml->next_rcu = inet->mc_list;
1907         iml->sflist = NULL;
1908         iml->sfmode = MCAST_EXCLUDE;
1909         rcu_assign_pointer(inet->mc_list, iml);
1910         ip_mc_inc_group(in_dev, addr);
1911         err = 0;
1912 done:
1913         rtnl_unlock();
1914         return err;
1915 }
1916 EXPORT_SYMBOL(ip_mc_join_group);
1917
1918 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1919                            struct in_device *in_dev)
1920 {
1921         struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1922         int err;
1923
1924         if (psf == NULL) {
1925                 /* any-source empty exclude case */
1926                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1927                         iml->sfmode, 0, NULL, 0);
1928         }
1929         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1930                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1931         RCU_INIT_POINTER(iml->sflist, NULL);
1932         /* decrease mem now to avoid the memleak warning */
1933         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1934         kfree_rcu(psf, rcu);
1935         return err;
1936 }
1937
1938 /*
1939  *      Ask a socket to leave a group.
1940  */
1941
1942 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1943 {
1944         struct inet_sock *inet = inet_sk(sk);
1945         struct ip_mc_socklist *iml;
1946         struct ip_mc_socklist __rcu **imlp;
1947         struct in_device *in_dev;
1948         struct net *net = sock_net(sk);
1949         __be32 group = imr->imr_multiaddr.s_addr;
1950         u32 ifindex;
1951         int ret = -EADDRNOTAVAIL;
1952
1953         rtnl_lock();
1954         in_dev = ip_mc_find_dev(net, imr);
1955         ifindex = imr->imr_ifindex;
1956         for (imlp = &inet->mc_list;
1957              (iml = rtnl_dereference(*imlp)) != NULL;
1958              imlp = &iml->next_rcu) {
1959                 if (iml->multi.imr_multiaddr.s_addr != group)
1960                         continue;
1961                 if (ifindex) {
1962                         if (iml->multi.imr_ifindex != ifindex)
1963                                 continue;
1964                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1965                                 iml->multi.imr_address.s_addr)
1966                         continue;
1967
1968                 (void) ip_mc_leave_src(sk, iml, in_dev);
1969
1970                 *imlp = iml->next_rcu;
1971
1972                 if (in_dev)
1973                         ip_mc_dec_group(in_dev, group);
1974                 rtnl_unlock();
1975                 /* decrease mem now to avoid the memleak warning */
1976                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1977                 kfree_rcu(iml, rcu);
1978                 return 0;
1979         }
1980         if (!in_dev)
1981                 ret = -ENODEV;
1982         rtnl_unlock();
1983         return ret;
1984 }
1985 EXPORT_SYMBOL(ip_mc_leave_group);
1986
1987 int ip_mc_source(int add, int omode, struct sock *sk, struct
1988         ip_mreq_source *mreqs, int ifindex)
1989 {
1990         int err;
1991         struct ip_mreqn imr;
1992         __be32 addr = mreqs->imr_multiaddr;
1993         struct ip_mc_socklist *pmc;
1994         struct in_device *in_dev = NULL;
1995         struct inet_sock *inet = inet_sk(sk);
1996         struct ip_sf_socklist *psl;
1997         struct net *net = sock_net(sk);
1998         int leavegroup = 0;
1999         int i, j, rv;
2000
2001         if (!ipv4_is_multicast(addr))
2002                 return -EINVAL;
2003
2004         rtnl_lock();
2005
2006         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2007         imr.imr_address.s_addr = mreqs->imr_interface;
2008         imr.imr_ifindex = ifindex;
2009         in_dev = ip_mc_find_dev(net, &imr);
2010
2011         if (!in_dev) {
2012                 err = -ENODEV;
2013                 goto done;
2014         }
2015         err = -EADDRNOTAVAIL;
2016
2017         for_each_pmc_rtnl(inet, pmc) {
2018                 if ((pmc->multi.imr_multiaddr.s_addr ==
2019                      imr.imr_multiaddr.s_addr) &&
2020                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
2021                         break;
2022         }
2023         if (!pmc) {             /* must have a prior join */
2024                 err = -EINVAL;
2025                 goto done;
2026         }
2027         /* if a source filter was set, must be the same mode as before */
2028         if (pmc->sflist) {
2029                 if (pmc->sfmode != omode) {
2030                         err = -EINVAL;
2031                         goto done;
2032                 }
2033         } else if (pmc->sfmode != omode) {
2034                 /* allow mode switches for empty-set filters */
2035                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2036                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2037                         NULL, 0);
2038                 pmc->sfmode = omode;
2039         }
2040
2041         psl = rtnl_dereference(pmc->sflist);
2042         if (!add) {
2043                 if (!psl)
2044                         goto done;      /* err = -EADDRNOTAVAIL */
2045                 rv = !0;
2046                 for (i=0; i<psl->sl_count; i++) {
2047                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2048                                 sizeof(__be32));
2049                         if (rv == 0)
2050                                 break;
2051                 }
2052                 if (rv)         /* source not found */
2053                         goto done;      /* err = -EADDRNOTAVAIL */
2054
2055                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2056                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2057                         leavegroup = 1;
2058                         goto done;
2059                 }
2060
2061                 /* update the interface filter */
2062                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2063                         &mreqs->imr_sourceaddr, 1);
2064
2065                 for (j=i+1; j<psl->sl_count; j++)
2066                         psl->sl_addr[j-1] = psl->sl_addr[j];
2067                 psl->sl_count--;
2068                 err = 0;
2069                 goto done;
2070         }
2071         /* else, add a new source to the filter */
2072
2073         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2074                 err = -ENOBUFS;
2075                 goto done;
2076         }
2077         if (!psl || psl->sl_count == psl->sl_max) {
2078                 struct ip_sf_socklist *newpsl;
2079                 int count = IP_SFBLOCK;
2080
2081                 if (psl)
2082                         count += psl->sl_max;
2083                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2084                 if (!newpsl) {
2085                         err = -ENOBUFS;
2086                         goto done;
2087                 }
2088                 newpsl->sl_max = count;
2089                 newpsl->sl_count = count - IP_SFBLOCK;
2090                 if (psl) {
2091                         for (i=0; i<psl->sl_count; i++)
2092                                 newpsl->sl_addr[i] = psl->sl_addr[i];
2093                         /* decrease mem now to avoid the memleak warning */
2094                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2095                         kfree_rcu(psl, rcu);
2096                 }
2097                 rcu_assign_pointer(pmc->sflist, newpsl);
2098                 psl = newpsl;
2099         }
2100         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2101         for (i=0; i<psl->sl_count; i++) {
2102                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2103                         sizeof(__be32));
2104                 if (rv == 0)
2105                         break;
2106         }
2107         if (rv == 0)            /* address already there is an error */
2108                 goto done;
2109         for (j=psl->sl_count-1; j>=i; j--)
2110                 psl->sl_addr[j+1] = psl->sl_addr[j];
2111         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2112         psl->sl_count++;
2113         err = 0;
2114         /* update the interface list */
2115         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2116                 &mreqs->imr_sourceaddr, 1);
2117 done:
2118         rtnl_unlock();
2119         if (leavegroup)
2120                 return ip_mc_leave_group(sk, &imr);
2121         return err;
2122 }
2123
2124 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2125 {
2126         int err = 0;
2127         struct ip_mreqn imr;
2128         __be32 addr = msf->imsf_multiaddr;
2129         struct ip_mc_socklist *pmc;
2130         struct in_device *in_dev;
2131         struct inet_sock *inet = inet_sk(sk);
2132         struct ip_sf_socklist *newpsl, *psl;
2133         struct net *net = sock_net(sk);
2134         int leavegroup = 0;
2135
2136         if (!ipv4_is_multicast(addr))
2137                 return -EINVAL;
2138         if (msf->imsf_fmode != MCAST_INCLUDE &&
2139             msf->imsf_fmode != MCAST_EXCLUDE)
2140                 return -EINVAL;
2141
2142         rtnl_lock();
2143
2144         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2145         imr.imr_address.s_addr = msf->imsf_interface;
2146         imr.imr_ifindex = ifindex;
2147         in_dev = ip_mc_find_dev(net, &imr);
2148
2149         if (!in_dev) {
2150                 err = -ENODEV;
2151                 goto done;
2152         }
2153
2154         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2155         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2156                 leavegroup = 1;
2157                 goto done;
2158         }
2159
2160         for_each_pmc_rtnl(inet, pmc) {
2161                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2162                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2163                         break;
2164         }
2165         if (!pmc) {             /* must have a prior join */
2166                 err = -EINVAL;
2167                 goto done;
2168         }
2169         if (msf->imsf_numsrc) {
2170                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2171                                                            GFP_KERNEL);
2172                 if (!newpsl) {
2173                         err = -ENOBUFS;
2174                         goto done;
2175                 }
2176                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2177                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2178                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2179                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2180                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2181                 if (err) {
2182                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2183                         goto done;
2184                 }
2185         } else {
2186                 newpsl = NULL;
2187                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2188                                      msf->imsf_fmode, 0, NULL, 0);
2189         }
2190         psl = rtnl_dereference(pmc->sflist);
2191         if (psl) {
2192                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2193                         psl->sl_count, psl->sl_addr, 0);
2194                 /* decrease mem now to avoid the memleak warning */
2195                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2196                 kfree_rcu(psl, rcu);
2197         } else
2198                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2199                         0, NULL, 0);
2200         rcu_assign_pointer(pmc->sflist, newpsl);
2201         pmc->sfmode = msf->imsf_fmode;
2202         err = 0;
2203 done:
2204         rtnl_unlock();
2205         if (leavegroup)
2206                 err = ip_mc_leave_group(sk, &imr);
2207         return err;
2208 }
2209
2210 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2211         struct ip_msfilter __user *optval, int __user *optlen)
2212 {
2213         int err, len, count, copycount;
2214         struct ip_mreqn imr;
2215         __be32 addr = msf->imsf_multiaddr;
2216         struct ip_mc_socklist *pmc;
2217         struct in_device *in_dev;
2218         struct inet_sock *inet = inet_sk(sk);
2219         struct ip_sf_socklist *psl;
2220         struct net *net = sock_net(sk);
2221
2222         if (!ipv4_is_multicast(addr))
2223                 return -EINVAL;
2224
2225         rtnl_lock();
2226
2227         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2228         imr.imr_address.s_addr = msf->imsf_interface;
2229         imr.imr_ifindex = 0;
2230         in_dev = ip_mc_find_dev(net, &imr);
2231
2232         if (!in_dev) {
2233                 err = -ENODEV;
2234                 goto done;
2235         }
2236         err = -EADDRNOTAVAIL;
2237
2238         for_each_pmc_rtnl(inet, pmc) {
2239                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2240                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2241                         break;
2242         }
2243         if (!pmc)               /* must have a prior join */
2244                 goto done;
2245         msf->imsf_fmode = pmc->sfmode;
2246         psl = rtnl_dereference(pmc->sflist);
2247         rtnl_unlock();
2248         if (!psl) {
2249                 len = 0;
2250                 count = 0;
2251         } else {
2252                 count = psl->sl_count;
2253         }
2254         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2255         len = copycount * sizeof(psl->sl_addr[0]);
2256         msf->imsf_numsrc = count;
2257         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2258             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2259                 return -EFAULT;
2260         }
2261         if (len &&
2262             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2263                 return -EFAULT;
2264         return 0;
2265 done:
2266         rtnl_unlock();
2267         return err;
2268 }
2269
2270 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2271         struct group_filter __user *optval, int __user *optlen)
2272 {
2273         int err, i, count, copycount;
2274         struct sockaddr_in *psin;
2275         __be32 addr;
2276         struct ip_mc_socklist *pmc;
2277         struct inet_sock *inet = inet_sk(sk);
2278         struct ip_sf_socklist *psl;
2279
2280         psin = (struct sockaddr_in *)&gsf->gf_group;
2281         if (psin->sin_family != AF_INET)
2282                 return -EINVAL;
2283         addr = psin->sin_addr.s_addr;
2284         if (!ipv4_is_multicast(addr))
2285                 return -EINVAL;
2286
2287         rtnl_lock();
2288
2289         err = -EADDRNOTAVAIL;
2290
2291         for_each_pmc_rtnl(inet, pmc) {
2292                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2293                     pmc->multi.imr_ifindex == gsf->gf_interface)
2294                         break;
2295         }
2296         if (!pmc)               /* must have a prior join */
2297                 goto done;
2298         gsf->gf_fmode = pmc->sfmode;
2299         psl = rtnl_dereference(pmc->sflist);
2300         rtnl_unlock();
2301         count = psl ? psl->sl_count : 0;
2302         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2303         gsf->gf_numsrc = count;
2304         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2305             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2306                 return -EFAULT;
2307         }
2308         for (i=0; i<copycount; i++) {
2309                 struct sockaddr_storage ss;
2310
2311                 psin = (struct sockaddr_in *)&ss;
2312                 memset(&ss, 0, sizeof(ss));
2313                 psin->sin_family = AF_INET;
2314                 psin->sin_addr.s_addr = psl->sl_addr[i];
2315                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2316                         return -EFAULT;
2317         }
2318         return 0;
2319 done:
2320         rtnl_unlock();
2321         return err;
2322 }
2323
2324 /*
2325  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2326  */
2327 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2328 {
2329         struct inet_sock *inet = inet_sk(sk);
2330         struct ip_mc_socklist *pmc;
2331         struct ip_sf_socklist *psl;
2332         int i;
2333         int ret;
2334
2335         ret = 1;
2336         if (!ipv4_is_multicast(loc_addr))
2337                 goto out;
2338
2339         rcu_read_lock();
2340         for_each_pmc_rcu(inet, pmc) {
2341                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2342                     pmc->multi.imr_ifindex == dif)
2343                         break;
2344         }
2345         ret = inet->mc_all;
2346         if (!pmc)
2347                 goto unlock;
2348         psl = rcu_dereference(pmc->sflist);
2349         ret = (pmc->sfmode == MCAST_EXCLUDE);
2350         if (!psl)
2351                 goto unlock;
2352
2353         for (i=0; i<psl->sl_count; i++) {
2354                 if (psl->sl_addr[i] == rmt_addr)
2355                         break;
2356         }
2357         ret = 0;
2358         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2359                 goto unlock;
2360         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2361                 goto unlock;
2362         ret = 1;
2363 unlock:
2364         rcu_read_unlock();
2365 out:
2366         return ret;
2367 }
2368
2369 /*
2370  *      A socket is closing.
2371  */
2372
2373 void ip_mc_drop_socket(struct sock *sk)
2374 {
2375         struct inet_sock *inet = inet_sk(sk);
2376         struct ip_mc_socklist *iml;
2377         struct net *net = sock_net(sk);
2378
2379         if (inet->mc_list == NULL)
2380                 return;
2381
2382         rtnl_lock();
2383         while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2384                 struct in_device *in_dev;
2385
2386                 inet->mc_list = iml->next_rcu;
2387                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2388                 (void) ip_mc_leave_src(sk, iml, in_dev);
2389                 if (in_dev != NULL)
2390                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2391                 /* decrease mem now to avoid the memleak warning */
2392                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2393                 kfree_rcu(iml, rcu);
2394         }
2395         rtnl_unlock();
2396 }
2397
2398 /* called with rcu_read_lock() */
2399 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2400 {
2401         struct ip_mc_list *im;
2402         struct ip_mc_list __rcu **mc_hash;
2403         struct ip_sf_list *psf;
2404         int rv = 0;
2405
2406         mc_hash = rcu_dereference(in_dev->mc_hash);
2407         if (mc_hash) {
2408                 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2409
2410                 for (im = rcu_dereference(mc_hash[hash]);
2411                      im != NULL;
2412                      im = rcu_dereference(im->next_hash)) {
2413                         if (im->multiaddr == mc_addr)
2414                                 break;
2415                 }
2416         } else {
2417                 for_each_pmc_rcu(in_dev, im) {
2418                         if (im->multiaddr == mc_addr)
2419                                 break;
2420                 }
2421         }
2422         if (im && proto == IPPROTO_IGMP) {
2423                 rv = 1;
2424         } else if (im) {
2425                 if (src_addr) {
2426                         for (psf=im->sources; psf; psf=psf->sf_next) {
2427                                 if (psf->sf_inaddr == src_addr)
2428                                         break;
2429                         }
2430                         if (psf)
2431                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2432                                         psf->sf_count[MCAST_EXCLUDE] !=
2433                                         im->sfcount[MCAST_EXCLUDE];
2434                         else
2435                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2436                 } else
2437                         rv = 1; /* unspecified source; tentatively allow */
2438         }
2439         return rv;
2440 }
2441
2442 #if defined(CONFIG_PROC_FS)
2443 struct igmp_mc_iter_state {
2444         struct seq_net_private p;
2445         struct net_device *dev;
2446         struct in_device *in_dev;
2447 };
2448
2449 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2450
2451 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2452 {
2453         struct net *net = seq_file_net(seq);
2454         struct ip_mc_list *im = NULL;
2455         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2456
2457         state->in_dev = NULL;
2458         for_each_netdev_rcu(net, state->dev) {
2459                 struct in_device *in_dev;
2460
2461                 in_dev = __in_dev_get_rcu(state->dev);
2462                 if (!in_dev)
2463                         continue;
2464                 im = rcu_dereference(in_dev->mc_list);
2465                 if (im) {
2466                         state->in_dev = in_dev;
2467                         break;
2468                 }
2469         }
2470         return im;
2471 }
2472
2473 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2474 {
2475         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2476
2477         im = rcu_dereference(im->next_rcu);
2478         while (!im) {
2479                 state->dev = next_net_device_rcu(state->dev);
2480                 if (!state->dev) {
2481                         state->in_dev = NULL;
2482                         break;
2483                 }
2484                 state->in_dev = __in_dev_get_rcu(state->dev);
2485                 if (!state->in_dev)
2486                         continue;
2487                 im = rcu_dereference(state->in_dev->mc_list);
2488         }
2489         return im;
2490 }
2491
2492 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2493 {
2494         struct ip_mc_list *im = igmp_mc_get_first(seq);
2495         if (im)
2496                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2497                         --pos;
2498         return pos ? NULL : im;
2499 }
2500
2501 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2502         __acquires(rcu)
2503 {
2504         rcu_read_lock();
2505         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2506 }
2507
2508 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2509 {
2510         struct ip_mc_list *im;
2511         if (v == SEQ_START_TOKEN)
2512                 im = igmp_mc_get_first(seq);
2513         else
2514                 im = igmp_mc_get_next(seq, v);
2515         ++*pos;
2516         return im;
2517 }
2518
2519 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2520         __releases(rcu)
2521 {
2522         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2523
2524         state->in_dev = NULL;
2525         state->dev = NULL;
2526         rcu_read_unlock();
2527 }
2528
2529 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2530 {
2531         if (v == SEQ_START_TOKEN)
2532                 seq_puts(seq,
2533                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2534         else {
2535                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2536                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2537                 char   *querier;
2538                 long delta;
2539
2540 #ifdef CONFIG_IP_MULTICAST
2541                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2542                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2543                           "V3";
2544 #else
2545                 querier = "NONE";
2546 #endif
2547
2548                 if (rcu_dereference(state->in_dev->mc_list) == im) {
2549                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2550                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2551                 }
2552
2553                 delta = im->timer.expires - jiffies;
2554                 seq_printf(seq,
2555                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2556                            im->multiaddr, im->users,
2557                            im->tm_running,
2558                            im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2559                            im->reporter);
2560         }
2561         return 0;
2562 }
2563
2564 static const struct seq_operations igmp_mc_seq_ops = {
2565         .start  =       igmp_mc_seq_start,
2566         .next   =       igmp_mc_seq_next,
2567         .stop   =       igmp_mc_seq_stop,
2568         .show   =       igmp_mc_seq_show,
2569 };
2570
2571 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2572 {
2573         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2574                         sizeof(struct igmp_mc_iter_state));
2575 }
2576
2577 static const struct file_operations igmp_mc_seq_fops = {
2578         .owner          =       THIS_MODULE,
2579         .open           =       igmp_mc_seq_open,
2580         .read           =       seq_read,
2581         .llseek         =       seq_lseek,
2582         .release        =       seq_release_net,
2583 };
2584
2585 struct igmp_mcf_iter_state {
2586         struct seq_net_private p;
2587         struct net_device *dev;
2588         struct in_device *idev;
2589         struct ip_mc_list *im;
2590 };
2591
2592 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2593
2594 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2595 {
2596         struct net *net = seq_file_net(seq);
2597         struct ip_sf_list *psf = NULL;
2598         struct ip_mc_list *im = NULL;
2599         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2600
2601         state->idev = NULL;
2602         state->im = NULL;
2603         for_each_netdev_rcu(net, state->dev) {
2604                 struct in_device *idev;
2605                 idev = __in_dev_get_rcu(state->dev);
2606                 if (unlikely(idev == NULL))
2607                         continue;
2608                 im = rcu_dereference(idev->mc_list);
2609                 if (likely(im != NULL)) {
2610                         spin_lock_bh(&im->lock);
2611                         psf = im->sources;
2612                         if (likely(psf != NULL)) {
2613                                 state->im = im;
2614                                 state->idev = idev;
2615                                 break;
2616                         }
2617                         spin_unlock_bh(&im->lock);
2618                 }
2619         }
2620         return psf;
2621 }
2622
2623 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2624 {
2625         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2626
2627         psf = psf->sf_next;
2628         while (!psf) {
2629                 spin_unlock_bh(&state->im->lock);
2630                 state->im = state->im->next;
2631                 while (!state->im) {
2632                         state->dev = next_net_device_rcu(state->dev);
2633                         if (!state->dev) {
2634                                 state->idev = NULL;
2635                                 goto out;
2636                         }
2637                         state->idev = __in_dev_get_rcu(state->dev);
2638                         if (!state->idev)
2639                                 continue;
2640                         state->im = rcu_dereference(state->idev->mc_list);
2641                 }
2642                 if (!state->im)
2643                         break;
2644                 spin_lock_bh(&state->im->lock);
2645                 psf = state->im->sources;
2646         }
2647 out:
2648         return psf;
2649 }
2650
2651 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2652 {
2653         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2654         if (psf)
2655                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2656                         --pos;
2657         return pos ? NULL : psf;
2658 }
2659
2660 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2661         __acquires(rcu)
2662 {
2663         rcu_read_lock();
2664         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2665 }
2666
2667 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2668 {
2669         struct ip_sf_list *psf;
2670         if (v == SEQ_START_TOKEN)
2671                 psf = igmp_mcf_get_first(seq);
2672         else
2673                 psf = igmp_mcf_get_next(seq, v);
2674         ++*pos;
2675         return psf;
2676 }
2677
2678 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2679         __releases(rcu)
2680 {
2681         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2682         if (likely(state->im != NULL)) {
2683                 spin_unlock_bh(&state->im->lock);
2684                 state->im = NULL;
2685         }
2686         state->idev = NULL;
2687         state->dev = NULL;
2688         rcu_read_unlock();
2689 }
2690
2691 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2692 {
2693         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2694         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2695
2696         if (v == SEQ_START_TOKEN) {
2697                 seq_printf(seq,
2698                            "%3s %6s "
2699                            "%10s %10s %6s %6s\n", "Idx",
2700                            "Device", "MCA",
2701                            "SRC", "INC", "EXC");
2702         } else {
2703                 seq_printf(seq,
2704                            "%3d %6.6s 0x%08x "
2705                            "0x%08x %6lu %6lu\n",
2706                            state->dev->ifindex, state->dev->name,
2707                            ntohl(state->im->multiaddr),
2708                            ntohl(psf->sf_inaddr),
2709                            psf->sf_count[MCAST_INCLUDE],
2710                            psf->sf_count[MCAST_EXCLUDE]);
2711         }
2712         return 0;
2713 }
2714
2715 static const struct seq_operations igmp_mcf_seq_ops = {
2716         .start  =       igmp_mcf_seq_start,
2717         .next   =       igmp_mcf_seq_next,
2718         .stop   =       igmp_mcf_seq_stop,
2719         .show   =       igmp_mcf_seq_show,
2720 };
2721
2722 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2723 {
2724         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2725                         sizeof(struct igmp_mcf_iter_state));
2726 }
2727
2728 static const struct file_operations igmp_mcf_seq_fops = {
2729         .owner          =       THIS_MODULE,
2730         .open           =       igmp_mcf_seq_open,
2731         .read           =       seq_read,
2732         .llseek         =       seq_lseek,
2733         .release        =       seq_release_net,
2734 };
2735
2736 static int __net_init igmp_net_init(struct net *net)
2737 {
2738         struct proc_dir_entry *pde;
2739
2740         pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2741         if (!pde)
2742                 goto out_igmp;
2743         pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2744                           &igmp_mcf_seq_fops);
2745         if (!pde)
2746                 goto out_mcfilter;
2747         return 0;
2748
2749 out_mcfilter:
2750         remove_proc_entry("igmp", net->proc_net);
2751 out_igmp:
2752         return -ENOMEM;
2753 }
2754
2755 static void __net_exit igmp_net_exit(struct net *net)
2756 {
2757         remove_proc_entry("mcfilter", net->proc_net);
2758         remove_proc_entry("igmp", net->proc_net);
2759 }
2760
2761 static struct pernet_operations igmp_net_ops = {
2762         .init = igmp_net_init,
2763         .exit = igmp_net_exit,
2764 };
2765
2766 static int igmp_netdev_event(struct notifier_block *this,
2767                              unsigned long event, void *ptr)
2768 {
2769         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2770         struct in_device *in_dev;
2771
2772         switch (event) {
2773         case NETDEV_RESEND_IGMP:
2774                 in_dev = __in_dev_get_rtnl(dev);
2775                 if (in_dev)
2776                         ip_mc_rejoin_groups(in_dev);
2777                 break;
2778         default:
2779                 break;
2780         }
2781         return NOTIFY_DONE;
2782 }
2783
2784 static struct notifier_block igmp_notifier = {
2785         .notifier_call = igmp_netdev_event,
2786 };
2787
2788 int __init igmp_mc_proc_init(void)
2789 {
2790         int err;
2791
2792         err = register_pernet_subsys(&igmp_net_ops);
2793         if (err)
2794                 return err;
2795         err = register_netdevice_notifier(&igmp_notifier);
2796         if (err)
2797                 goto reg_notif_fail;
2798         return 0;
2799
2800 reg_notif_fail:
2801         unregister_pernet_subsys(&igmp_net_ops);
2802         return err;
2803 }
2804 #endif