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