net/ipv4/igmp.c

   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Authors:
  12  *              Alan Cox <alan@lxorguk.ukuu.org.uk>
  13  *
  14  *      This program is free software; you can redistribute it and/or
  15  *      modify it under the terms of the GNU General Public License
  16  *      as published by the Free Software Foundation; either version
  17  *      2 of the License, or (at your option) any later version.
  18  *
  19  *      Fixes:
  20  *
  21  *              Alan Cox        :       Added lots of __inline__ to optimise
  22  *                                      the memory usage of all the tiny little
  23  *                                      functions.
  24  *              Alan Cox        :       Dumped the header building experiment.
  25  *              Alan Cox        :       Minor tweaks ready for multicast routing
  26  *                                      and extended IGMP protocol.
  27  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  28  *                                      writes utterly bogus code otherwise (sigh)
  29  *                                      fixed IGMP loopback to behave in the manner
  30  *                                      desired by mrouted, fixed the fact it has been
  31  *                                      broken since 1.3.6 and cleaned up a few minor
  32  *                                      points.
  33  *
  34  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  35  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  36  *                                      The enhancements are mainly based on Steve Deering's
  37  *                                      ipmulti-3.5 source code.
  38  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  39  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  40  *                                      the mrouted version on that device.
  41  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  42  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  43  *                                      to identify the multicast router version
  44  *                                      and do what the IGMP version 2 specified.
  45  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  46  *              Tsu-Sheng Tsao          if the specified time expired.
  47  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  48  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  49  *              Christian Daudt :       igmp timer wasn't set for local group
  50  *                                      memberships but was being deleted,
  51  *                                      which caused a "del_timer() called
  52  *                                      from %p with timer not initialized\n"
  53  *                                      message (960131).
  54  *              Christian Daudt :       removed del_timer from
  55  *                                      igmp_timer_expire function (960205).
  56  *             Christian Daudt :       igmp_heard_report now only calls
  57  *                                     igmp_timer_expire if tm->running is
  58  *                                     true (960216).
  59  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  60  *                                      igmp_heard_query never trigger. Expiry
  61  *                                      miscalculation fixed in igmp_heard_query
  62  *                                      and random() made to return unsigned to
  63  *                                      prevent negative expiry times.
  64  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  65  *                                      fix from pending 2.1.x patches.
  66  *              Alan Cox:               Forget to enable FDDI support earlier.
  67  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  68  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  69  *              David L Stevens:        IGMPv3 support, with help from
  70  *                                      Vinay Kulkarni
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/slab.h>
  75 #include <asm/uaccess.h>
  76 #include <linux/types.h>
  77 #include <linux/kernel.h>
  78 #include <linux/jiffies.h>
  79 #include <linux/string.h>
  80 #include <linux/socket.h>
  81 #include <linux/sockios.h>
  82 #include <linux/in.h>
  83 #include <linux/inet.h>
  84 #include <linux/netdevice.h>
  85 #include <linux/skbuff.h>
  86 #include <linux/inetdevice.h>
  87 #include <linux/igmp.h>
  88 #include <linux/if_arp.h>
  89 #include <linux/rtnetlink.h>
  90 #include <linux/times.h>
  91
  92 #include <net/net_namespace.h>
  93 #include <net/arp.h>
  94 #include <net/ip.h>
  95 #include <net/protocol.h>
  96 #include <net/route.h>
  97 #include <net/sock.h>
  98 #include <net/checksum.h>
  99 #include <linux/netfilter_ipv4.h>
 100 #ifdef CONFIG_IP_MROUTE
 101 #include <linux/mroute.h>
 102 #endif
 103 #ifdef CONFIG_PROC_FS
 104 #include <linux/proc_fs.h>
 105 #include <linux/seq_file.h>
 106 #endif
 107
 108 #define IP_MAX_MEMBERSHIPS      20
 109 #define IP_MAX_MSF              10
 110
 111 #ifdef CONFIG_IP_MULTICAST
 112 /* Parameter names and values are taken from igmp-v2-06 draft */
 113
 114 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 115 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 116 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 117 #define IGMP_Query_Response_Interval            (10*HZ)
 118 #define IGMP_Unsolicited_Report_Count           2
 119
 120
 121 #define IGMP_Initial_Report_Delay               (1)
 122
 123 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 124  * IGMP specs require to report membership immediately after
 125  * joining a group, but we delay the first report by a
 126  * small interval. It seems more natural and still does not
 127  * contradict to specs provided this delay is small enough.
 128  */
 129
 130 #define IGMP_V1_SEEN(in_dev) \
 131         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 132          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 133          ((in_dev)->mr_v1_seen && \
 134           time_before(jiffies, (in_dev)->mr_v1_seen)))
 135 #define IGMP_V2_SEEN(in_dev) \
 136         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 137          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 138          ((in_dev)->mr_v2_seen && \
 139           time_before(jiffies, (in_dev)->mr_v2_seen)))
 140
 141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 143 static void igmpv3_clear_delrec(struct in_device *in_dev);
 144 static int sf_setstate(struct ip_mc_list *pmc);
 145 static void sf_markstate(struct ip_mc_list *pmc);
 146 #endif
 147 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 149                          int sfcount, __be32 *psfsrc, int delta);
 150
 151 static void ip_ma_put(struct ip_mc_list *im)
 152 {
 153         if (atomic_dec_and_test(&im->refcnt)) {
 154                 in_dev_put(im->interface);
 155                 kfree_rcu(im, rcu);
 156         }
 157 }
 158
 159 #define for_each_pmc_rcu(in_dev, pmc)                           \
 160         for (pmc = rcu_dereference(in_dev->mc_list);            \
 161              pmc != NULL;                                       \
 162              pmc = rcu_dereference(pmc->next_rcu))
 163
 164 #define for_each_pmc_rtnl(in_dev, pmc)                          \
 165         for (pmc = rtnl_dereference(in_dev->mc_list);           \
 166              pmc != NULL;                                       \
 167              pmc = rtnl_dereference(pmc->next_rcu))
 168
 169 #ifdef CONFIG_IP_MULTICAST
 170
 171 /*
 172  *      Timer management
 173  */
 174
 175 static void igmp_stop_timer(struct ip_mc_list *im)
 176 {
 177         spin_lock_bh(&im->lock);
 178         if (del_timer(&im->timer))
 179                 atomic_dec(&im->refcnt);
 180         im->tm_running = 0;
 181         im->reporter = 0;
 182         im->unsolicit_count = 0;
 183         spin_unlock_bh(&im->lock);
 184 }
 185
 186 /* It must be called with locked im->lock */
 187 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 188 {
 189         int tv = net_random() % max_delay;
 190
 191         im->tm_running = 1;
 192         if (!mod_timer(&im->timer, jiffies+tv+2))
 193                 atomic_inc(&im->refcnt);
 194 }
 195
 196 static void igmp_gq_start_timer(struct in_device *in_dev)
 197 {
 198         int tv = net_random() % in_dev->mr_maxdelay;
 199
 200         in_dev->mr_gq_running = 1;
 201         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 202                 in_dev_hold(in_dev);
 203 }
 204
 205 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 206 {
 207         int tv = net_random() % delay;
 208
 209         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 210                 in_dev_hold(in_dev);
 211 }
 212
 213 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 214 {
 215         spin_lock_bh(&im->lock);
 216         im->unsolicit_count = 0;
 217         if (del_timer(&im->timer)) {
 218                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 219                         add_timer(&im->timer);
 220                         im->tm_running = 1;
 221                         spin_unlock_bh(&im->lock);
 222                         return;
 223                 }
 224                 atomic_dec(&im->refcnt);
 225         }
 226         igmp_start_timer(im, max_delay);
 227         spin_unlock_bh(&im->lock);
 228 }
 229
 230
 231 /*
 232  *      Send an IGMP report.
 233  */
 234
 235 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 236
 237
 238 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 239         int gdeleted, int sdeleted)
 240 {
 241         switch (type) {
 242         case IGMPV3_MODE_IS_INCLUDE:
 243         case IGMPV3_MODE_IS_EXCLUDE:
 244                 if (gdeleted || sdeleted)
 245                         return 0;
 246                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 247                         if (pmc->sfmode == MCAST_INCLUDE)
 248                                 return 1;
 249                         /* don't include if this source is excluded
 250                          * in all filters
 251                          */
 252                         if (psf->sf_count[MCAST_INCLUDE])
 253                                 return type == IGMPV3_MODE_IS_INCLUDE;
 254                         return pmc->sfcount[MCAST_EXCLUDE] ==
 255                                 psf->sf_count[MCAST_EXCLUDE];
 256                 }
 257                 return 0;
 258         case IGMPV3_CHANGE_TO_INCLUDE:
 259                 if (gdeleted || sdeleted)
 260                         return 0;
 261                 return psf->sf_count[MCAST_INCLUDE] != 0;
 262         case IGMPV3_CHANGE_TO_EXCLUDE:
 263                 if (gdeleted || sdeleted)
 264                         return 0;
 265                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 266                     psf->sf_count[MCAST_INCLUDE])
 267                         return 0;
 268                 return pmc->sfcount[MCAST_EXCLUDE] ==
 269                         psf->sf_count[MCAST_EXCLUDE];
 270         case IGMPV3_ALLOW_NEW_SOURCES:
 271                 if (gdeleted || !psf->sf_crcount)
 272                         return 0;
 273                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 274         case IGMPV3_BLOCK_OLD_SOURCES:
 275                 if (pmc->sfmode == MCAST_INCLUDE)
 276                         return gdeleted || (psf->sf_crcount && sdeleted);
 277                 return psf->sf_crcount && !gdeleted && !sdeleted;
 278         }
 279         return 0;
 280 }
 281
 282 static int
 283 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 284 {
 285         struct ip_sf_list *psf;
 286         int scount = 0;
 287
 288         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 289                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 290                         continue;
 291                 scount++;
 292         }
 293         return scount;
 294 }
 295
 296 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
 297
 298 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 299 {
 300         struct sk_buff *skb;
 301         struct rtable *rt;
 302         struct iphdr *pip;
 303         struct igmpv3_report *pig;
 304         struct net *net = dev_net(dev);
 305         struct flowi4 fl4;
 306         int hlen = LL_RESERVED_SPACE(dev);
 307         int tlen = dev->needed_tailroom;
 308
 309         while (1) {
 310                 skb = alloc_skb(size + hlen + tlen,
 311                                 GFP_ATOMIC | __GFP_NOWARN);
 312                 if (skb)
 313                         break;
 314                 size >>= 1;
 315                 if (size < 256)
 316                         return NULL;
 317         }
 318         igmp_skb_size(skb) = size;
 319
 320         rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
 321                                    0, 0,
 322                                    IPPROTO_IGMP, 0, dev->ifindex);
 323         if (IS_ERR(rt)) {
 324                 kfree_skb(skb);
 325                 return NULL;
 326         }
 327
 328         skb_dst_set(skb, &rt->dst);
 329         skb->dev = dev;
 330
 331         skb_reserve(skb, hlen);
 332
 333         skb_reset_network_header(skb);
 334         pip = ip_hdr(skb);
 335         skb_put(skb, sizeof(struct iphdr) + 4);
 336
 337         pip->version  = 4;
 338         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 339         pip->tos      = 0xc0;
 340         pip->frag_off = htons(IP_DF);
 341         pip->ttl      = 1;
 342         pip->daddr    = fl4.daddr;
 343         pip->saddr    = fl4.saddr;
 344         pip->protocol = IPPROTO_IGMP;
 345         pip->tot_len  = 0;      /* filled in later */
 346         ip_select_ident(pip, &rt->dst, NULL);
 347         ((u8 *)&pip[1])[0] = IPOPT_RA;
 348         ((u8 *)&pip[1])[1] = 4;
 349         ((u8 *)&pip[1])[2] = 0;
 350         ((u8 *)&pip[1])[3] = 0;
 351
 352         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 353         skb_put(skb, sizeof(*pig));
 354         pig = igmpv3_report_hdr(skb);
 355         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 356         pig->resv1 = 0;
 357         pig->csum = 0;
 358         pig->resv2 = 0;
 359         pig->ngrec = 0;
 360         return skb;
 361 }
 362
 363 static int igmpv3_sendpack(struct sk_buff *skb)
 364 {
 365         struct igmphdr *pig = igmp_hdr(skb);
 366         const int igmplen = skb->tail - skb->transport_header;
 367
 368         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 369
 370         return ip_local_out(skb);
 371 }
 372
 373 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 374 {
 375         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
 376 }
 377
 378 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 379         int type, struct igmpv3_grec **ppgr)
 380 {
 381         struct net_device *dev = pmc->interface->dev;
 382         struct igmpv3_report *pih;
 383         struct igmpv3_grec *pgr;
 384
 385         if (!skb)
 386                 skb = igmpv3_newpack(dev, dev->mtu);
 387         if (!skb)
 388                 return NULL;
 389         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 390         pgr->grec_type = type;
 391         pgr->grec_auxwords = 0;
 392         pgr->grec_nsrcs = 0;
 393         pgr->grec_mca = pmc->multiaddr;
 394         pih = igmpv3_report_hdr(skb);
 395         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 396         *ppgr = pgr;
 397         return skb;
 398 }
 399
 400 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
 401         skb_tailroom(skb)) : 0)
 402
 403 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 404         int type, int gdeleted, int sdeleted)
 405 {
 406         struct net_device *dev = pmc->interface->dev;
 407         struct igmpv3_report *pih;
 408         struct igmpv3_grec *pgr = NULL;
 409         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 410         int scount, stotal, first, isquery, truncate;
 411
 412         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 413                 return skb;
 414
 415         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 416                   type == IGMPV3_MODE_IS_EXCLUDE;
 417         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 418                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 419
 420         stotal = scount = 0;
 421
 422         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 423
 424         if (!*psf_list)
 425                 goto empty_source;
 426
 427         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 428
 429         /* EX and TO_EX get a fresh packet, if needed */
 430         if (truncate) {
 431                 if (pih && pih->ngrec &&
 432                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 433                         if (skb)
 434                                 igmpv3_sendpack(skb);
 435                         skb = igmpv3_newpack(dev, dev->mtu);
 436                 }
 437         }
 438         first = 1;
 439         psf_prev = NULL;
 440         for (psf=*psf_list; psf; psf=psf_next) {
 441                 __be32 *psrc;
 442
 443                 psf_next = psf->sf_next;
 444
 445                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 446                         psf_prev = psf;
 447                         continue;
 448                 }
 449
 450                 /* clear marks on query responses */
 451                 if (isquery)
 452                         psf->sf_gsresp = 0;
 453
 454                 if (AVAILABLE(skb) < sizeof(__be32) +
 455                     first*sizeof(struct igmpv3_grec)) {
 456                         if (truncate && !first)
 457                                 break;   /* truncate these */
 458                         if (pgr)
 459                                 pgr->grec_nsrcs = htons(scount);
 460                         if (skb)
 461                                 igmpv3_sendpack(skb);
 462                         skb = igmpv3_newpack(dev, dev->mtu);
 463                         first = 1;
 464                         scount = 0;
 465                 }
 466                 if (first) {
 467                         skb = add_grhead(skb, pmc, type, &pgr);
 468                         first = 0;
 469                 }
 470                 if (!skb)
 471                         return NULL;
 472                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 473                 *psrc = psf->sf_inaddr;
 474                 scount++; stotal++;
 475                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 476                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 477                         psf->sf_crcount--;
 478                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 479                                 if (psf_prev)
 480                                         psf_prev->sf_next = psf->sf_next;
 481                                 else
 482                                         *psf_list = psf->sf_next;
 483                                 kfree(psf);
 484                                 continue;
 485                         }
 486                 }
 487                 psf_prev = psf;
 488         }
 489
 490 empty_source:
 491         if (!stotal) {
 492                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 493                     type == IGMPV3_BLOCK_OLD_SOURCES)
 494                         return skb;
 495                 if (pmc->crcount || isquery) {
 496                         /* make sure we have room for group header */
 497                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 498                                 igmpv3_sendpack(skb);
 499                                 skb = NULL; /* add_grhead will get a new one */
 500                         }
 501                         skb = add_grhead(skb, pmc, type, &pgr);
 502                 }
 503         }
 504         if (pgr)
 505                 pgr->grec_nsrcs = htons(scount);
 506
 507         if (isquery)
 508                 pmc->gsquery = 0;       /* clear query state on report */
 509         return skb;
 510 }
 511
 512 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 513 {
 514         struct sk_buff *skb = NULL;
 515         int type;
 516
 517         if (!pmc) {
 518                 rcu_read_lock();
 519                 for_each_pmc_rcu(in_dev, pmc) {
 520                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 521                                 continue;
 522                         spin_lock_bh(&pmc->lock);
 523                         if (pmc->sfcount[MCAST_EXCLUDE])
 524                                 type = IGMPV3_MODE_IS_EXCLUDE;
 525                         else
 526                                 type = IGMPV3_MODE_IS_INCLUDE;
 527                         skb = add_grec(skb, pmc, type, 0, 0);
 528                         spin_unlock_bh(&pmc->lock);
 529                 }
 530                 rcu_read_unlock();
 531         } else {
 532                 spin_lock_bh(&pmc->lock);
 533                 if (pmc->sfcount[MCAST_EXCLUDE])
 534                         type = IGMPV3_MODE_IS_EXCLUDE;
 535                 else
 536                         type = IGMPV3_MODE_IS_INCLUDE;
 537                 skb = add_grec(skb, pmc, type, 0, 0);
 538                 spin_unlock_bh(&pmc->lock);
 539         }
 540         if (!skb)
 541                 return 0;
 542         return igmpv3_sendpack(skb);
 543 }
 544
 545 /*
 546  * remove zero-count source records from a source filter list
 547  */
 548 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 549 {
 550         struct ip_sf_list *psf_prev, *psf_next, *psf;
 551
 552         psf_prev = NULL;
 553         for (psf=*ppsf; psf; psf = psf_next) {
 554                 psf_next = psf->sf_next;
 555                 if (psf->sf_crcount == 0) {
 556                         if (psf_prev)
 557                                 psf_prev->sf_next = psf->sf_next;
 558                         else
 559                                 *ppsf = psf->sf_next;
 560                         kfree(psf);
 561                 } else
 562                         psf_prev = psf;
 563         }
 564 }
 565
 566 static void igmpv3_send_cr(struct in_device *in_dev)
 567 {
 568         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 569         struct sk_buff *skb = NULL;
 570         int type, dtype;
 571
 572         rcu_read_lock();
 573         spin_lock_bh(&in_dev->mc_tomb_lock);
 574
 575         /* deleted MCA's */
 576         pmc_prev = NULL;
 577         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 578                 pmc_next = pmc->next;
 579                 if (pmc->sfmode == MCAST_INCLUDE) {
 580                         type = IGMPV3_BLOCK_OLD_SOURCES;
 581                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 582                         skb = add_grec(skb, pmc, type, 1, 0);
 583                         skb = add_grec(skb, pmc, dtype, 1, 1);
 584                 }
 585                 if (pmc->crcount) {
 586                         if (pmc->sfmode == MCAST_EXCLUDE) {
 587                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 588                                 skb = add_grec(skb, pmc, type, 1, 0);
 589                         }
 590                         pmc->crcount--;
 591                         if (pmc->crcount == 0) {
 592                                 igmpv3_clear_zeros(&pmc->tomb);
 593                                 igmpv3_clear_zeros(&pmc->sources);
 594                         }
 595                 }
 596                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 597                         if (pmc_prev)
 598                                 pmc_prev->next = pmc_next;
 599                         else
 600                                 in_dev->mc_tomb = pmc_next;
 601                         in_dev_put(pmc->interface);
 602                         kfree(pmc);
 603                 } else
 604                         pmc_prev = pmc;
 605         }
 606         spin_unlock_bh(&in_dev->mc_tomb_lock);
 607
 608         /* change recs */
 609         for_each_pmc_rcu(in_dev, pmc) {
 610                 spin_lock_bh(&pmc->lock);
 611                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 612                         type = IGMPV3_BLOCK_OLD_SOURCES;
 613                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 614                 } else {
 615                         type = IGMPV3_ALLOW_NEW_SOURCES;
 616                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 617                 }
 618                 skb = add_grec(skb, pmc, type, 0, 0);
 619                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 620
 621                 /* filter mode changes */
 622                 if (pmc->crcount) {
 623                         if (pmc->sfmode == MCAST_EXCLUDE)
 624                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 625                         else
 626                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 627                         skb = add_grec(skb, pmc, type, 0, 0);
 628                         pmc->crcount--;
 629                 }
 630                 spin_unlock_bh(&pmc->lock);
 631         }
 632         rcu_read_unlock();
 633
 634         if (!skb)
 635                 return;
 636         (void) igmpv3_sendpack(skb);
 637 }
 638
 639 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 640         int type)
 641 {
 642         struct sk_buff *skb;
 643         struct iphdr *iph;
 644         struct igmphdr *ih;
 645         struct rtable *rt;
 646         struct net_device *dev = in_dev->dev;
 647         struct net *net = dev_net(dev);
 648         __be32  group = pmc ? pmc->multiaddr : 0;
 649         struct flowi4 fl4;
 650         __be32  dst;
 651         int hlen, tlen;
 652
 653         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 654                 return igmpv3_send_report(in_dev, pmc);
 655         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 656                 dst = IGMP_ALL_ROUTER;
 657         else
 658                 dst = group;
 659
 660         rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
 661                                    0, 0,
 662                                    IPPROTO_IGMP, 0, dev->ifindex);
 663         if (IS_ERR(rt))
 664                 return -1;
 665
 666         hlen = LL_RESERVED_SPACE(dev);
 667         tlen = dev->needed_tailroom;
 668         skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
 669         if (skb == NULL) {
 670                 ip_rt_put(rt);
 671                 return -1;
 672         }
 673
 674         skb_dst_set(skb, &rt->dst);
 675
 676         skb_reserve(skb, hlen);
 677
 678         skb_reset_network_header(skb);
 679         iph = ip_hdr(skb);
 680         skb_put(skb, sizeof(struct iphdr) + 4);
 681
 682         iph->version  = 4;
 683         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 684         iph->tos      = 0xc0;
 685         iph->frag_off = htons(IP_DF);
 686         iph->ttl      = 1;
 687         iph->daddr    = dst;
 688         iph->saddr    = fl4.saddr;
 689         iph->protocol = IPPROTO_IGMP;
 690         ip_select_ident(iph, &rt->dst, NULL);
 691         ((u8 *)&iph[1])[0] = IPOPT_RA;
 692         ((u8 *)&iph[1])[1] = 4;
 693         ((u8 *)&iph[1])[2] = 0;
 694         ((u8 *)&iph[1])[3] = 0;
 695
 696         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 697         ih->type = type;
 698         ih->code = 0;
 699         ih->csum = 0;
 700         ih->group = group;
 701         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 702
 703         return ip_local_out(skb);
 704 }
 705
 706 static void igmp_gq_timer_expire(unsigned long data)
 707 {
 708         struct in_device *in_dev = (struct in_device *)data;
 709
 710         in_dev->mr_gq_running = 0;
 711         igmpv3_send_report(in_dev, NULL);
 712         __in_dev_put(in_dev);
 713 }
 714
 715 static void igmp_ifc_timer_expire(unsigned long data)
 716 {
 717         struct in_device *in_dev = (struct in_device *)data;
 718
 719         igmpv3_send_cr(in_dev);
 720         if (in_dev->mr_ifc_count) {
 721                 in_dev->mr_ifc_count--;
 722                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 723         }
 724         __in_dev_put(in_dev);
 725 }
 726
 727 static void igmp_ifc_event(struct in_device *in_dev)
 728 {
 729         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 730                 return;
 731         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 732                 IGMP_Unsolicited_Report_Count;
 733         igmp_ifc_start_timer(in_dev, 1);
 734 }
 735
 736
 737 static void igmp_timer_expire(unsigned long data)
 738 {
 739         struct ip_mc_list *im=(struct ip_mc_list *)data;
 740         struct in_device *in_dev = im->interface;
 741
 742         spin_lock(&im->lock);
 743         im->tm_running = 0;
 744
 745         if (im->unsolicit_count) {
 746                 im->unsolicit_count--;
 747                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 748         }
 749         im->reporter = 1;
 750         spin_unlock(&im->lock);
 751
 752         if (IGMP_V1_SEEN(in_dev))
 753                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 754         else if (IGMP_V2_SEEN(in_dev))
 755                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 756         else
 757                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 758
 759         ip_ma_put(im);
 760 }
 761
 762 /* mark EXCLUDE-mode sources */
 763 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 764 {
 765         struct ip_sf_list *psf;
 766         int i, scount;
 767
 768         scount = 0;
 769         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 770                 if (scount == nsrcs)
 771                         break;
 772                 for (i=0; i<nsrcs; i++) {
 773                         /* skip inactive filters */
 774                         if (psf->sf_count[MCAST_INCLUDE] ||
 775                             pmc->sfcount[MCAST_EXCLUDE] !=
 776                             psf->sf_count[MCAST_EXCLUDE])
 777                                 break;
 778                         if (srcs[i] == psf->sf_inaddr) {
 779                                 scount++;
 780                                 break;
 781                         }
 782                 }
 783         }
 784         pmc->gsquery = 0;
 785         if (scount == nsrcs)    /* all sources excluded */
 786                 return 0;
 787         return 1;
 788 }
 789
 790 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 791 {
 792         struct ip_sf_list *psf;
 793         int i, scount;
 794
 795         if (pmc->sfmode == MCAST_EXCLUDE)
 796                 return igmp_xmarksources(pmc, nsrcs, srcs);
 797
 798         /* mark INCLUDE-mode sources */
 799         scount = 0;
 800         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 801                 if (scount == nsrcs)
 802                         break;
 803                 for (i=0; i<nsrcs; i++)
 804                         if (srcs[i] == psf->sf_inaddr) {
 805                                 psf->sf_gsresp = 1;
 806                                 scount++;
 807                                 break;
 808                         }
 809         }
 810         if (!scount) {
 811                 pmc->gsquery = 0;
 812                 return 0;
 813         }
 814         pmc->gsquery = 1;
 815         return 1;
 816 }
 817
 818 /* return true if packet was dropped */
 819 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
 820 {
 821         struct ip_mc_list *im;
 822
 823         /* Timers are only set for non-local groups */
 824
 825         if (group == IGMP_ALL_HOSTS)
 826                 return false;
 827
 828         rcu_read_lock();
 829         for_each_pmc_rcu(in_dev, im) {
 830                 if (im->multiaddr == group) {
 831                         igmp_stop_timer(im);
 832                         break;
 833                 }
 834         }
 835         rcu_read_unlock();
 836         return false;
 837 }
 838
 839 /* return true if packet was dropped */
 840 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 841         int len)
 842 {
 843         struct igmphdr          *ih = igmp_hdr(skb);
 844         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 845         struct ip_mc_list       *im;
 846         __be32                  group = ih->group;
 847         int                     max_delay;
 848         int                     mark = 0;
 849
 850
 851         if (len == 8) {
 852                 if (ih->code == 0) {
 853                         /* Alas, old v1 router presents here. */
 854
 855                         max_delay = IGMP_Query_Response_Interval;
 856                         in_dev->mr_v1_seen = jiffies +
 857                                 IGMP_V1_Router_Present_Timeout;
 858                         group = 0;
 859                 } else {
 860                         /* v2 router present */
 861                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 862                         in_dev->mr_v2_seen = jiffies +
 863                                 IGMP_V2_Router_Present_Timeout;
 864                 }
 865                 /* cancel the interface change timer */
 866                 in_dev->mr_ifc_count = 0;
 867                 if (del_timer(&in_dev->mr_ifc_timer))
 868                         __in_dev_put(in_dev);
 869                 /* clear deleted report items */
 870                 igmpv3_clear_delrec(in_dev);
 871         } else if (len < 12) {
 872                 return true;    /* ignore bogus packet; freed by caller */
 873         } else if (IGMP_V1_SEEN(in_dev)) {
 874                 /* This is a v3 query with v1 queriers present */
 875                 max_delay = IGMP_Query_Response_Interval;
 876                 group = 0;
 877         } else if (IGMP_V2_SEEN(in_dev)) {
 878                 /* this is a v3 query with v2 queriers present;
 879                  * Interpretation of the max_delay code is problematic here.
 880                  * A real v2 host would use ih_code directly, while v3 has a
 881                  * different encoding. We use the v3 encoding as more likely
 882                  * to be intended in a v3 query.
 883                  */
 884                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 885                 if (!max_delay)
 886                         max_delay = 1;  /* can't mod w/ 0 */
 887         } else { /* v3 */
 888                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 889                         return true;
 890
 891                 ih3 = igmpv3_query_hdr(skb);
 892                 if (ih3->nsrcs) {
 893                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 894                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 895                                 return true;
 896                         ih3 = igmpv3_query_hdr(skb);
 897                 }
 898
 899                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 900                 if (!max_delay)
 901                         max_delay = 1;  /* can't mod w/ 0 */
 902                 in_dev->mr_maxdelay = max_delay;
 903                 if (ih3->qrv)
 904                         in_dev->mr_qrv = ih3->qrv;
 905                 if (!group) { /* general query */
 906                         if (ih3->nsrcs)
 907                                 return false;   /* no sources allowed */
 908                         igmp_gq_start_timer(in_dev);
 909                         return false;
 910                 }
 911                 /* mark sources to include, if group & source-specific */
 912                 mark = ih3->nsrcs != 0;
 913         }
 914
 915         /*
 916          * - Start the timers in all of our membership records
 917          *   that the query applies to for the interface on
 918          *   which the query arrived excl. those that belong
 919          *   to a "local" group (224.0.0.X)
 920          * - For timers already running check if they need to
 921          *   be reset.
 922          * - Use the igmp->igmp_code field as the maximum
 923          *   delay possible
 924          */
 925         rcu_read_lock();
 926         for_each_pmc_rcu(in_dev, im) {
 927                 int changed;
 928
 929                 if (group && group != im->multiaddr)
 930                         continue;
 931                 if (im->multiaddr == IGMP_ALL_HOSTS)
 932                         continue;
 933                 spin_lock_bh(&im->lock);
 934                 if (im->tm_running)
 935                         im->gsquery = im->gsquery && mark;
 936                 else
 937                         im->gsquery = mark;
 938                 changed = !im->gsquery ||
 939                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 940                 spin_unlock_bh(&im->lock);
 941                 if (changed)
 942                         igmp_mod_timer(im, max_delay);
 943         }
 944         rcu_read_unlock();
 945         return false;
 946 }
 947
 948 /* called in rcu_read_lock() section */
 949 int igmp_rcv(struct sk_buff *skb)
 950 {
 951         /* This basically follows the spec line by line -- see RFC1112 */
 952         struct igmphdr *ih;
 953         struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
 954         int len = skb->len;
 955         bool dropped = true;
 956
 957         if (in_dev == NULL)
 958                 goto drop;
 959
 960         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 961                 goto drop;
 962
 963         switch (skb->ip_summed) {
 964         case CHECKSUM_COMPLETE:
 965                 if (!csum_fold(skb->csum))
 966                         break;
 967                 /* fall through */
 968         case CHECKSUM_NONE:
 969                 skb->csum = 0;
 970                 if (__skb_checksum_complete(skb))
 971                         goto drop;
 972         }
 973
 974         ih = igmp_hdr(skb);
 975         switch (ih->type) {
 976         case IGMP_HOST_MEMBERSHIP_QUERY:
 977                 dropped = igmp_heard_query(in_dev, skb, len);
 978                 break;
 979         case IGMP_HOST_MEMBERSHIP_REPORT:
 980         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 981                 /* Is it our report looped back? */
 982                 if (rt_is_output_route(skb_rtable(skb)))
 983                         break;
 984                 /* don't rely on MC router hearing unicast reports */
 985                 if (skb->pkt_type == PACKET_MULTICAST ||
 986                     skb->pkt_type == PACKET_BROADCAST)
 987                         dropped = igmp_heard_report(in_dev, ih->group);
 988                 break;
 989         case IGMP_PIM:
 990 #ifdef CONFIG_IP_PIMSM_V1
 991                 return pim_rcv_v1(skb);
 992 #endif
 993         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 994         case IGMP_DVMRP:
 995         case IGMP_TRACE:
 996         case IGMP_HOST_LEAVE_MESSAGE:
 997         case IGMP_MTRACE:
 998         case IGMP_MTRACE_RESP:
 999                 break;
1000         default:
1001                 break;
1002         }
1003
1004 drop:
1005         if (dropped)
1006                 kfree_skb(skb);
1007         else
1008                 consume_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 ndo_set_rx_mode
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                         return;
1173                 if (IGMP_V2_SEEN(in_dev)) {
1174                         if (reporter)
1175                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1176                         return;
1177                 }
1178                 /* IGMPv3 */
1179                 igmpv3_add_delrec(in_dev, im);
1180
1181                 igmp_ifc_event(in_dev);
1182         }
1183 #endif
1184 }
1185
1186 static void igmp_group_added(struct ip_mc_list *im)
1187 {
1188         struct in_device *in_dev = im->interface;
1189
1190         if (im->loaded == 0) {
1191                 im->loaded = 1;
1192                 ip_mc_filter_add(in_dev, im->multiaddr);
1193         }
1194
1195 #ifdef CONFIG_IP_MULTICAST
1196         if (im->multiaddr == IGMP_ALL_HOSTS)
1197                 return;
1198
1199         if (in_dev->dead)
1200                 return;
1201         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1202                 spin_lock_bh(&im->lock);
1203                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1204                 spin_unlock_bh(&im->lock);
1205                 return;
1206         }
1207         /* else, v3 */
1208
1209         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1210                 IGMP_Unsolicited_Report_Count;
1211         igmp_ifc_event(in_dev);
1212 #endif
1213 }
1214
1215
1216 /*
1217  *      Multicast list managers
1218  */
1219
1220
1221 /*
1222  *      A socket has joined a multicast group on device dev.
1223  */
1224
1225 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1226 {
1227         struct ip_mc_list *im;
1228
1229         ASSERT_RTNL();
1230
1231         for_each_pmc_rtnl(in_dev, im) {
1232                 if (im->multiaddr == addr) {
1233                         im->users++;
1234                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1235                         goto out;
1236                 }
1237         }
1238
1239         im = kzalloc(sizeof(*im), GFP_KERNEL);
1240         if (!im)
1241                 goto out;
1242
1243         im->users = 1;
1244         im->interface = in_dev;
1245         in_dev_hold(in_dev);
1246         im->multiaddr = addr;
1247         /* initial mode is (EX, empty) */
1248         im->sfmode = MCAST_EXCLUDE;
1249         im->sfcount[MCAST_EXCLUDE] = 1;
1250         atomic_set(&im->refcnt, 1);
1251         spin_lock_init(&im->lock);
1252 #ifdef CONFIG_IP_MULTICAST
1253         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1254         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1255 #endif
1256
1257         im->next_rcu = in_dev->mc_list;
1258         in_dev->mc_count++;
1259         rcu_assign_pointer(in_dev->mc_list, im);
1260
1261 #ifdef CONFIG_IP_MULTICAST
1262         igmpv3_del_delrec(in_dev, im->multiaddr);
1263 #endif
1264         igmp_group_added(im);
1265         if (!in_dev->dead)
1266                 ip_rt_multicast_event(in_dev);
1267 out:
1268         return;
1269 }
1270 EXPORT_SYMBOL(ip_mc_inc_group);
1271
1272 /*
1273  *      Resend IGMP JOIN report; used for bonding.
1274  *      Called with rcu_read_lock()
1275  */
1276 void ip_mc_rejoin_groups(struct in_device *in_dev)
1277 {
1278 #ifdef CONFIG_IP_MULTICAST
1279         struct ip_mc_list *im;
1280         int type;
1281
1282         for_each_pmc_rcu(in_dev, im) {
1283                 if (im->multiaddr == IGMP_ALL_HOSTS)
1284                         continue;
1285
1286                 /* a failover is happening and switches
1287                  * must be notified immediately
1288                  */
1289                 if (IGMP_V1_SEEN(in_dev))
1290                         type = IGMP_HOST_MEMBERSHIP_REPORT;
1291                 else if (IGMP_V2_SEEN(in_dev))
1292                         type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1293                 else
1294                         type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1295                 igmp_send_report(in_dev, im, type);
1296         }
1297 #endif
1298 }
1299 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1300
1301 /*
1302  *      A socket has left a multicast group on device dev
1303  */
1304
1305 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1306 {
1307         struct ip_mc_list *i;
1308         struct ip_mc_list __rcu **ip;
1309
1310         ASSERT_RTNL();
1311
1312         for (ip = &in_dev->mc_list;
1313              (i = rtnl_dereference(*ip)) != NULL;
1314              ip = &i->next_rcu) {
1315                 if (i->multiaddr == addr) {
1316                         if (--i->users == 0) {
1317                                 *ip = i->next_rcu;
1318                                 in_dev->mc_count--;
1319                                 igmp_group_dropped(i);
1320                                 ip_mc_clear_src(i);
1321
1322                                 if (!in_dev->dead)
1323                                         ip_rt_multicast_event(in_dev);
1324
1325                                 ip_ma_put(i);
1326                                 return;
1327                         }
1328                         break;
1329                 }
1330         }
1331 }
1332 EXPORT_SYMBOL(ip_mc_dec_group);
1333
1334 /* Device changing type */
1335
1336 void ip_mc_unmap(struct in_device *in_dev)
1337 {
1338         struct ip_mc_list *pmc;
1339
1340         ASSERT_RTNL();
1341
1342         for_each_pmc_rtnl(in_dev, pmc)
1343                 igmp_group_dropped(pmc);
1344 }
1345
1346 void ip_mc_remap(struct in_device *in_dev)
1347 {
1348         struct ip_mc_list *pmc;
1349
1350         ASSERT_RTNL();
1351
1352         for_each_pmc_rtnl(in_dev, pmc)
1353                 igmp_group_added(pmc);
1354 }
1355
1356 /* Device going down */
1357
1358 void ip_mc_down(struct in_device *in_dev)
1359 {
1360         struct ip_mc_list *pmc;
1361
1362         ASSERT_RTNL();
1363
1364         for_each_pmc_rtnl(in_dev, pmc)
1365                 igmp_group_dropped(pmc);
1366
1367 #ifdef CONFIG_IP_MULTICAST
1368         in_dev->mr_ifc_count = 0;
1369         if (del_timer(&in_dev->mr_ifc_timer))
1370                 __in_dev_put(in_dev);
1371         in_dev->mr_gq_running = 0;
1372         if (del_timer(&in_dev->mr_gq_timer))
1373                 __in_dev_put(in_dev);
1374         igmpv3_clear_delrec(in_dev);
1375 #endif
1376
1377         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1378 }
1379
1380 void ip_mc_init_dev(struct in_device *in_dev)
1381 {
1382         ASSERT_RTNL();
1383
1384         in_dev->mc_tomb = NULL;
1385 #ifdef CONFIG_IP_MULTICAST
1386         in_dev->mr_gq_running = 0;
1387         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1388                         (unsigned long)in_dev);
1389         in_dev->mr_ifc_count = 0;
1390         in_dev->mc_count     = 0;
1391         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1392                         (unsigned long)in_dev);
1393         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1394 #endif
1395
1396         spin_lock_init(&in_dev->mc_tomb_lock);
1397 }
1398
1399 /* Device going up */
1400
1401 void ip_mc_up(struct in_device *in_dev)
1402 {
1403         struct ip_mc_list *pmc;
1404
1405         ASSERT_RTNL();
1406
1407         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1408
1409         for_each_pmc_rtnl(in_dev, pmc)
1410                 igmp_group_added(pmc);
1411 }
1412
1413 /*
1414  *      Device is about to be destroyed: clean up.
1415  */
1416
1417 void ip_mc_destroy_dev(struct in_device *in_dev)
1418 {
1419         struct ip_mc_list *i;
1420
1421         ASSERT_RTNL();
1422
1423         /* Deactivate timers */
1424         ip_mc_down(in_dev);
1425
1426         while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1427                 in_dev->mc_list = i->next_rcu;
1428                 in_dev->mc_count--;
1429
1430                 /* We've dropped the groups in ip_mc_down already */
1431                 ip_mc_clear_src(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)
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]);
1727                 if (err)
1728                         break;
1729         }
1730         if (err) {
1731                 int j;
1732
1733                 if (!delta)
1734                         pmc->sfcount[sfmode]--;
1735                 for (j=0; j<i; j++)
1736                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1737         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1738 #ifdef CONFIG_IP_MULTICAST
1739                 struct ip_sf_list *psf;
1740                 in_dev = pmc->interface;
1741 #endif
1742
1743                 /* filter mode change */
1744                 if (pmc->sfcount[MCAST_EXCLUDE])
1745                         pmc->sfmode = MCAST_EXCLUDE;
1746                 else if (pmc->sfcount[MCAST_INCLUDE])
1747                         pmc->sfmode = MCAST_INCLUDE;
1748 #ifdef CONFIG_IP_MULTICAST
1749                 /* else no filters; keep old mode for reports */
1750
1751                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1752                         IGMP_Unsolicited_Report_Count;
1753                 in_dev->mr_ifc_count = pmc->crcount;
1754                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1755                         psf->sf_crcount = 0;
1756                 igmp_ifc_event(in_dev);
1757         } else if (sf_setstate(pmc)) {
1758                 igmp_ifc_event(in_dev);
1759 #endif
1760         }
1761         spin_unlock_bh(&pmc->lock);
1762         return err;
1763 }
1764
1765 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1766 {
1767         struct ip_sf_list *psf, *nextpsf;
1768
1769         for (psf=pmc->tomb; psf; psf=nextpsf) {
1770                 nextpsf = psf->sf_next;
1771                 kfree(psf);
1772         }
1773         pmc->tomb = NULL;
1774         for (psf=pmc->sources; psf; psf=nextpsf) {
1775                 nextpsf = psf->sf_next;
1776                 kfree(psf);
1777         }
1778         pmc->sources = NULL;
1779         pmc->sfmode = MCAST_EXCLUDE;
1780         pmc->sfcount[MCAST_INCLUDE] = 0;
1781         pmc->sfcount[MCAST_EXCLUDE] = 1;
1782 }
1783
1784
1785 /*
1786  * Join a multicast group
1787  */
1788 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1789 {
1790         int err;
1791         __be32 addr = imr->imr_multiaddr.s_addr;
1792         struct ip_mc_socklist *iml = NULL, *i;
1793         struct in_device *in_dev;
1794         struct inet_sock *inet = inet_sk(sk);
1795         struct net *net = sock_net(sk);
1796         int ifindex;
1797         int count = 0;
1798
1799         if (!ipv4_is_multicast(addr))
1800                 return -EINVAL;
1801
1802         rtnl_lock();
1803
1804         in_dev = ip_mc_find_dev(net, imr);
1805
1806         if (!in_dev) {
1807                 iml = NULL;
1808                 err = -ENODEV;
1809                 goto done;
1810         }
1811
1812         err = -EADDRINUSE;
1813         ifindex = imr->imr_ifindex;
1814         for_each_pmc_rtnl(inet, i) {
1815                 if (i->multi.imr_multiaddr.s_addr == addr &&
1816                     i->multi.imr_ifindex == ifindex)
1817                         goto done;
1818                 count++;
1819         }
1820         err = -ENOBUFS;
1821         if (count >= sysctl_igmp_max_memberships)
1822                 goto done;
1823         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1824         if (iml == NULL)
1825                 goto done;
1826
1827         memcpy(&iml->multi, imr, sizeof(*imr));
1828         iml->next_rcu = inet->mc_list;
1829         iml->sflist = NULL;
1830         iml->sfmode = MCAST_EXCLUDE;
1831         rcu_assign_pointer(inet->mc_list, iml);
1832         ip_mc_inc_group(in_dev, addr);
1833         err = 0;
1834 done:
1835         rtnl_unlock();
1836         return err;
1837 }
1838 EXPORT_SYMBOL(ip_mc_join_group);
1839
1840 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1841                            struct in_device *in_dev)
1842 {
1843         struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1844         int err;
1845
1846         if (psf == NULL) {
1847                 /* any-source empty exclude case */
1848                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1849                         iml->sfmode, 0, NULL, 0);
1850         }
1851         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1852                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1853         RCU_INIT_POINTER(iml->sflist, NULL);
1854         /* decrease mem now to avoid the memleak warning */
1855         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1856         kfree_rcu(psf, rcu);
1857         return err;
1858 }
1859
1860 /*
1861  *      Ask a socket to leave a group.
1862  */
1863
1864 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1865 {
1866         struct inet_sock *inet = inet_sk(sk);
1867         struct ip_mc_socklist *iml;
1868         struct ip_mc_socklist __rcu **imlp;
1869         struct in_device *in_dev;
1870         struct net *net = sock_net(sk);
1871         __be32 group = imr->imr_multiaddr.s_addr;
1872         u32 ifindex;
1873         int ret = -EADDRNOTAVAIL;
1874
1875         rtnl_lock();
1876         in_dev = ip_mc_find_dev(net, imr);
1877         ifindex = imr->imr_ifindex;
1878         for (imlp = &inet->mc_list;
1879              (iml = rtnl_dereference(*imlp)) != NULL;
1880              imlp = &iml->next_rcu) {
1881                 if (iml->multi.imr_multiaddr.s_addr != group)
1882                         continue;
1883                 if (ifindex) {
1884                         if (iml->multi.imr_ifindex != ifindex)
1885                                 continue;
1886                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1887                                 iml->multi.imr_address.s_addr)
1888                         continue;
1889
1890                 (void) ip_mc_leave_src(sk, iml, in_dev);
1891
1892                 *imlp = iml->next_rcu;
1893
1894                 if (in_dev)
1895                         ip_mc_dec_group(in_dev, group);
1896                 rtnl_unlock();
1897                 /* decrease mem now to avoid the memleak warning */
1898                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1899                 kfree_rcu(iml, rcu);
1900                 return 0;
1901         }
1902         if (!in_dev)
1903                 ret = -ENODEV;
1904         rtnl_unlock();
1905         return ret;
1906 }
1907 EXPORT_SYMBOL(ip_mc_leave_group);
1908
1909 int ip_mc_source(int add, int omode, struct sock *sk, struct
1910         ip_mreq_source *mreqs, int ifindex)
1911 {
1912         int err;
1913         struct ip_mreqn imr;
1914         __be32 addr = mreqs->imr_multiaddr;
1915         struct ip_mc_socklist *pmc;
1916         struct in_device *in_dev = NULL;
1917         struct inet_sock *inet = inet_sk(sk);
1918         struct ip_sf_socklist *psl;
1919         struct net *net = sock_net(sk);
1920         int leavegroup = 0;
1921         int i, j, rv;
1922
1923         if (!ipv4_is_multicast(addr))
1924                 return -EINVAL;
1925
1926         rtnl_lock();
1927
1928         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1929         imr.imr_address.s_addr = mreqs->imr_interface;
1930         imr.imr_ifindex = ifindex;
1931         in_dev = ip_mc_find_dev(net, &imr);
1932
1933         if (!in_dev) {
1934                 err = -ENODEV;
1935                 goto done;
1936         }
1937         err = -EADDRNOTAVAIL;
1938
1939         for_each_pmc_rtnl(inet, pmc) {
1940                 if ((pmc->multi.imr_multiaddr.s_addr ==
1941                      imr.imr_multiaddr.s_addr) &&
1942                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
1943                         break;
1944         }
1945         if (!pmc) {             /* must have a prior join */
1946                 err = -EINVAL;
1947                 goto done;
1948         }
1949         /* if a source filter was set, must be the same mode as before */
1950         if (pmc->sflist) {
1951                 if (pmc->sfmode != omode) {
1952                         err = -EINVAL;
1953                         goto done;
1954                 }
1955         } else if (pmc->sfmode != omode) {
1956                 /* allow mode switches for empty-set filters */
1957                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1958                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1959                         NULL, 0);
1960                 pmc->sfmode = omode;
1961         }
1962
1963         psl = rtnl_dereference(pmc->sflist);
1964         if (!add) {
1965                 if (!psl)
1966                         goto done;      /* err = -EADDRNOTAVAIL */
1967                 rv = !0;
1968                 for (i=0; i<psl->sl_count; i++) {
1969                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1970                                 sizeof(__be32));
1971                         if (rv == 0)
1972                                 break;
1973                 }
1974                 if (rv)         /* source not found */
1975                         goto done;      /* err = -EADDRNOTAVAIL */
1976
1977                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1978                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1979                         leavegroup = 1;
1980                         goto done;
1981                 }
1982
1983                 /* update the interface filter */
1984                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1985                         &mreqs->imr_sourceaddr, 1);
1986
1987                 for (j=i+1; j<psl->sl_count; j++)
1988                         psl->sl_addr[j-1] = psl->sl_addr[j];
1989                 psl->sl_count--;
1990                 err = 0;
1991                 goto done;
1992         }
1993         /* else, add a new source to the filter */
1994
1995         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1996                 err = -ENOBUFS;
1997                 goto done;
1998         }
1999         if (!psl || psl->sl_count == psl->sl_max) {
2000                 struct ip_sf_socklist *newpsl;
2001                 int count = IP_SFBLOCK;
2002
2003                 if (psl)
2004                         count += psl->sl_max;
2005                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2006                 if (!newpsl) {
2007                         err = -ENOBUFS;
2008                         goto done;
2009                 }
2010                 newpsl->sl_max = count;
2011                 newpsl->sl_count = count - IP_SFBLOCK;
2012                 if (psl) {
2013                         for (i=0; i<psl->sl_count; i++)
2014                                 newpsl->sl_addr[i] = psl->sl_addr[i];
2015                         /* decrease mem now to avoid the memleak warning */
2016                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2017                         kfree_rcu(psl, rcu);
2018                 }
2019                 rcu_assign_pointer(pmc->sflist, newpsl);
2020                 psl = newpsl;
2021         }
2022         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2023         for (i=0; i<psl->sl_count; i++) {
2024                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2025                         sizeof(__be32));
2026                 if (rv == 0)
2027                         break;
2028         }
2029         if (rv == 0)            /* address already there is an error */
2030                 goto done;
2031         for (j=psl->sl_count-1; j>=i; j--)
2032                 psl->sl_addr[j+1] = psl->sl_addr[j];
2033         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2034         psl->sl_count++;
2035         err = 0;
2036         /* update the interface list */
2037         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2038                 &mreqs->imr_sourceaddr, 1);
2039 done:
2040         rtnl_unlock();
2041         if (leavegroup)
2042                 return ip_mc_leave_group(sk, &imr);
2043         return err;
2044 }
2045
2046 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2047 {
2048         int err = 0;
2049         struct ip_mreqn imr;
2050         __be32 addr = msf->imsf_multiaddr;
2051         struct ip_mc_socklist *pmc;
2052         struct in_device *in_dev;
2053         struct inet_sock *inet = inet_sk(sk);
2054         struct ip_sf_socklist *newpsl, *psl;
2055         struct net *net = sock_net(sk);
2056         int leavegroup = 0;
2057
2058         if (!ipv4_is_multicast(addr))
2059                 return -EINVAL;
2060         if (msf->imsf_fmode != MCAST_INCLUDE &&
2061             msf->imsf_fmode != MCAST_EXCLUDE)
2062                 return -EINVAL;
2063
2064         rtnl_lock();
2065
2066         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2067         imr.imr_address.s_addr = msf->imsf_interface;
2068         imr.imr_ifindex = ifindex;
2069         in_dev = ip_mc_find_dev(net, &imr);
2070
2071         if (!in_dev) {
2072                 err = -ENODEV;
2073                 goto done;
2074         }
2075
2076         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2077         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2078                 leavegroup = 1;
2079                 goto done;
2080         }
2081
2082         for_each_pmc_rtnl(inet, pmc) {
2083                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2084                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2085                         break;
2086         }
2087         if (!pmc) {             /* must have a prior join */
2088                 err = -EINVAL;
2089                 goto done;
2090         }
2091         if (msf->imsf_numsrc) {
2092                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2093                                                            GFP_KERNEL);
2094                 if (!newpsl) {
2095                         err = -ENOBUFS;
2096                         goto done;
2097                 }
2098                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2099                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2100                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2101                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2102                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2103                 if (err) {
2104                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2105                         goto done;
2106                 }
2107         } else {
2108                 newpsl = NULL;
2109                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2110                                      msf->imsf_fmode, 0, NULL, 0);
2111         }
2112         psl = rtnl_dereference(pmc->sflist);
2113         if (psl) {
2114                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2115                         psl->sl_count, psl->sl_addr, 0);
2116                 /* decrease mem now to avoid the memleak warning */
2117                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2118                 kfree_rcu(psl, rcu);
2119         } else
2120                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2121                         0, NULL, 0);
2122         rcu_assign_pointer(pmc->sflist, newpsl);
2123         pmc->sfmode = msf->imsf_fmode;
2124         err = 0;
2125 done:
2126         rtnl_unlock();
2127         if (leavegroup)
2128                 err = ip_mc_leave_group(sk, &imr);
2129         return err;
2130 }
2131
2132 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2133         struct ip_msfilter __user *optval, int __user *optlen)
2134 {
2135         int err, len, count, copycount;
2136         struct ip_mreqn imr;
2137         __be32 addr = msf->imsf_multiaddr;
2138         struct ip_mc_socklist *pmc;
2139         struct in_device *in_dev;
2140         struct inet_sock *inet = inet_sk(sk);
2141         struct ip_sf_socklist *psl;
2142         struct net *net = sock_net(sk);
2143
2144         if (!ipv4_is_multicast(addr))
2145                 return -EINVAL;
2146
2147         rtnl_lock();
2148
2149         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2150         imr.imr_address.s_addr = msf->imsf_interface;
2151         imr.imr_ifindex = 0;
2152         in_dev = ip_mc_find_dev(net, &imr);
2153
2154         if (!in_dev) {
2155                 err = -ENODEV;
2156                 goto done;
2157         }
2158         err = -EADDRNOTAVAIL;
2159
2160         for_each_pmc_rtnl(inet, pmc) {
2161                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2162                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2163                         break;
2164         }
2165         if (!pmc)               /* must have a prior join */
2166                 goto done;
2167         msf->imsf_fmode = pmc->sfmode;
2168         psl = rtnl_dereference(pmc->sflist);
2169         rtnl_unlock();
2170         if (!psl) {
2171                 len = 0;
2172                 count = 0;
2173         } else {
2174                 count = psl->sl_count;
2175         }
2176         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2177         len = copycount * sizeof(psl->sl_addr[0]);
2178         msf->imsf_numsrc = count;
2179         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2180             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2181                 return -EFAULT;
2182         }
2183         if (len &&
2184             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2185                 return -EFAULT;
2186         return 0;
2187 done:
2188         rtnl_unlock();
2189         return err;
2190 }
2191
2192 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2193         struct group_filter __user *optval, int __user *optlen)
2194 {
2195         int err, i, count, copycount;
2196         struct sockaddr_in *psin;
2197         __be32 addr;
2198         struct ip_mc_socklist *pmc;
2199         struct inet_sock *inet = inet_sk(sk);
2200         struct ip_sf_socklist *psl;
2201
2202         psin = (struct sockaddr_in *)&gsf->gf_group;
2203         if (psin->sin_family != AF_INET)
2204                 return -EINVAL;
2205         addr = psin->sin_addr.s_addr;
2206         if (!ipv4_is_multicast(addr))
2207                 return -EINVAL;
2208
2209         rtnl_lock();
2210
2211         err = -EADDRNOTAVAIL;
2212
2213         for_each_pmc_rtnl(inet, pmc) {
2214                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2215                     pmc->multi.imr_ifindex == gsf->gf_interface)
2216                         break;
2217         }
2218         if (!pmc)               /* must have a prior join */
2219                 goto done;
2220         gsf->gf_fmode = pmc->sfmode;
2221         psl = rtnl_dereference(pmc->sflist);
2222         rtnl_unlock();
2223         count = psl ? psl->sl_count : 0;
2224         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2225         gsf->gf_numsrc = count;
2226         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2227             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2228                 return -EFAULT;
2229         }
2230         for (i=0; i<copycount; i++) {
2231                 struct sockaddr_storage ss;
2232
2233                 psin = (struct sockaddr_in *)&ss;
2234                 memset(&ss, 0, sizeof(ss));
2235                 psin->sin_family = AF_INET;
2236                 psin->sin_addr.s_addr = psl->sl_addr[i];
2237                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2238                         return -EFAULT;
2239         }
2240         return 0;
2241 done:
2242         rtnl_unlock();
2243         return err;
2244 }
2245
2246 /*
2247  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2248  */
2249 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2250 {
2251         struct inet_sock *inet = inet_sk(sk);
2252         struct ip_mc_socklist *pmc;
2253         struct ip_sf_socklist *psl;
2254         int i;
2255         int ret;
2256
2257         ret = 1;
2258         if (!ipv4_is_multicast(loc_addr))
2259                 goto out;
2260
2261         rcu_read_lock();
2262         for_each_pmc_rcu(inet, pmc) {
2263                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2264                     pmc->multi.imr_ifindex == dif)
2265                         break;
2266         }
2267         ret = inet->mc_all;
2268         if (!pmc)
2269                 goto unlock;
2270         psl = rcu_dereference(pmc->sflist);
2271         ret = (pmc->sfmode == MCAST_EXCLUDE);
2272         if (!psl)
2273                 goto unlock;
2274
2275         for (i=0; i<psl->sl_count; i++) {
2276                 if (psl->sl_addr[i] == rmt_addr)
2277                         break;
2278         }
2279         ret = 0;
2280         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2281                 goto unlock;
2282         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2283                 goto unlock;
2284         ret = 1;
2285 unlock:
2286         rcu_read_unlock();
2287 out:
2288         return ret;
2289 }
2290
2291 /*
2292  *      A socket is closing.
2293  */
2294
2295 void ip_mc_drop_socket(struct sock *sk)
2296 {
2297         struct inet_sock *inet = inet_sk(sk);
2298         struct ip_mc_socklist *iml;
2299         struct net *net = sock_net(sk);
2300
2301         if (inet->mc_list == NULL)
2302                 return;
2303
2304         rtnl_lock();
2305         while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2306                 struct in_device *in_dev;
2307
2308                 inet->mc_list = iml->next_rcu;
2309                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2310                 (void) ip_mc_leave_src(sk, iml, in_dev);
2311                 if (in_dev != NULL)
2312                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2313                 /* decrease mem now to avoid the memleak warning */
2314                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2315                 kfree_rcu(iml, rcu);
2316         }
2317         rtnl_unlock();
2318 }
2319
2320 /* called with rcu_read_lock() */
2321 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2322 {
2323         struct ip_mc_list *im;
2324         struct ip_sf_list *psf;
2325         int rv = 0;
2326
2327         for_each_pmc_rcu(in_dev, im) {
2328                 if (im->multiaddr == mc_addr)
2329                         break;
2330         }
2331         if (im && proto == IPPROTO_IGMP) {
2332                 rv = 1;
2333         } else if (im) {
2334                 if (src_addr) {
2335                         for (psf=im->sources; psf; psf=psf->sf_next) {
2336                                 if (psf->sf_inaddr == src_addr)
2337                                         break;
2338                         }
2339                         if (psf)
2340                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2341                                         psf->sf_count[MCAST_EXCLUDE] !=
2342                                         im->sfcount[MCAST_EXCLUDE];
2343                         else
2344                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2345                 } else
2346                         rv = 1; /* unspecified source; tentatively allow */
2347         }
2348         return rv;
2349 }
2350
2351 #if defined(CONFIG_PROC_FS)
2352 struct igmp_mc_iter_state {
2353         struct seq_net_private p;
2354         struct net_device *dev;
2355         struct in_device *in_dev;
2356 };
2357
2358 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2359
2360 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2361 {
2362         struct net *net = seq_file_net(seq);
2363         struct ip_mc_list *im = NULL;
2364         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2365
2366         state->in_dev = NULL;
2367         for_each_netdev_rcu(net, state->dev) {
2368                 struct in_device *in_dev;
2369
2370                 in_dev = __in_dev_get_rcu(state->dev);
2371                 if (!in_dev)
2372                         continue;
2373                 im = rcu_dereference(in_dev->mc_list);
2374                 if (im) {
2375                         state->in_dev = in_dev;
2376                         break;
2377                 }
2378         }
2379         return im;
2380 }
2381
2382 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2383 {
2384         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2385
2386         im = rcu_dereference(im->next_rcu);
2387         while (!im) {
2388                 state->dev = next_net_device_rcu(state->dev);
2389                 if (!state->dev) {
2390                         state->in_dev = NULL;
2391                         break;
2392                 }
2393                 state->in_dev = __in_dev_get_rcu(state->dev);
2394                 if (!state->in_dev)
2395                         continue;
2396                 im = rcu_dereference(state->in_dev->mc_list);
2397         }
2398         return im;
2399 }
2400
2401 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2402 {
2403         struct ip_mc_list *im = igmp_mc_get_first(seq);
2404         if (im)
2405                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2406                         --pos;
2407         return pos ? NULL : im;
2408 }
2409
2410 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2411         __acquires(rcu)
2412 {
2413         rcu_read_lock();
2414         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2415 }
2416
2417 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2418 {
2419         struct ip_mc_list *im;
2420         if (v == SEQ_START_TOKEN)
2421                 im = igmp_mc_get_first(seq);
2422         else
2423                 im = igmp_mc_get_next(seq, v);
2424         ++*pos;
2425         return im;
2426 }
2427
2428 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2429         __releases(rcu)
2430 {
2431         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2432
2433         state->in_dev = NULL;
2434         state->dev = NULL;
2435         rcu_read_unlock();
2436 }
2437
2438 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2439 {
2440         if (v == SEQ_START_TOKEN)
2441                 seq_puts(seq,
2442                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2443         else {
2444                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2445                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2446                 char   *querier;
2447                 long delta;
2448
2449 #ifdef CONFIG_IP_MULTICAST
2450                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2451                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2452                           "V3";
2453 #else
2454                 querier = "NONE";
2455 #endif
2456
2457                 if (rcu_dereference(state->in_dev->mc_list) == im) {
2458                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2459                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2460                 }
2461
2462                 delta = im->timer.expires - jiffies;
2463                 seq_printf(seq,
2464                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2465                            im->multiaddr, im->users,
2466                            im->tm_running,
2467                            im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2468                            im->reporter);
2469         }
2470         return 0;
2471 }
2472
2473 static const struct seq_operations igmp_mc_seq_ops = {
2474         .start  =       igmp_mc_seq_start,
2475         .next   =       igmp_mc_seq_next,
2476         .stop   =       igmp_mc_seq_stop,
2477         .show   =       igmp_mc_seq_show,
2478 };
2479
2480 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2481 {
2482         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2483                         sizeof(struct igmp_mc_iter_state));
2484 }
2485
2486 static const struct file_operations igmp_mc_seq_fops = {
2487         .owner          =       THIS_MODULE,
2488         .open           =       igmp_mc_seq_open,
2489         .read           =       seq_read,
2490         .llseek         =       seq_lseek,
2491         .release        =       seq_release_net,
2492 };
2493
2494 struct igmp_mcf_iter_state {
2495         struct seq_net_private p;
2496         struct net_device *dev;
2497         struct in_device *idev;
2498         struct ip_mc_list *im;
2499 };
2500
2501 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2502
2503 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2504 {
2505         struct net *net = seq_file_net(seq);
2506         struct ip_sf_list *psf = NULL;
2507         struct ip_mc_list *im = NULL;
2508         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2509
2510         state->idev = NULL;
2511         state->im = NULL;
2512         for_each_netdev_rcu(net, state->dev) {
2513                 struct in_device *idev;
2514                 idev = __in_dev_get_rcu(state->dev);
2515                 if (unlikely(idev == NULL))
2516                         continue;
2517                 im = rcu_dereference(idev->mc_list);
2518                 if (likely(im != NULL)) {
2519                         spin_lock_bh(&im->lock);
2520                         psf = im->sources;
2521                         if (likely(psf != NULL)) {
2522                                 state->im = im;
2523                                 state->idev = idev;
2524                                 break;
2525                         }
2526                         spin_unlock_bh(&im->lock);
2527                 }
2528         }
2529         return psf;
2530 }
2531
2532 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2533 {
2534         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2535
2536         psf = psf->sf_next;
2537         while (!psf) {
2538                 spin_unlock_bh(&state->im->lock);
2539                 state->im = state->im->next;
2540                 while (!state->im) {
2541                         state->dev = next_net_device_rcu(state->dev);
2542                         if (!state->dev) {
2543                                 state->idev = NULL;
2544                                 goto out;
2545                         }
2546                         state->idev = __in_dev_get_rcu(state->dev);
2547                         if (!state->idev)
2548                                 continue;
2549                         state->im = rcu_dereference(state->idev->mc_list);
2550                 }
2551                 if (!state->im)
2552                         break;
2553                 spin_lock_bh(&state->im->lock);
2554                 psf = state->im->sources;
2555         }
2556 out:
2557         return psf;
2558 }
2559
2560 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2561 {
2562         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2563         if (psf)
2564                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2565                         --pos;
2566         return pos ? NULL : psf;
2567 }
2568
2569 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2570         __acquires(rcu)
2571 {
2572         rcu_read_lock();
2573         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2574 }
2575
2576 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2577 {
2578         struct ip_sf_list *psf;
2579         if (v == SEQ_START_TOKEN)
2580                 psf = igmp_mcf_get_first(seq);
2581         else
2582                 psf = igmp_mcf_get_next(seq, v);
2583         ++*pos;
2584         return psf;
2585 }
2586
2587 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2588         __releases(rcu)
2589 {
2590         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2591         if (likely(state->im != NULL)) {
2592                 spin_unlock_bh(&state->im->lock);
2593                 state->im = NULL;
2594         }
2595         state->idev = NULL;
2596         state->dev = NULL;
2597         rcu_read_unlock();
2598 }
2599
2600 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2601 {
2602         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2603         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2604
2605         if (v == SEQ_START_TOKEN) {
2606                 seq_printf(seq,
2607                            "%3s %6s "
2608                            "%10s %10s %6s %6s\n", "Idx",
2609                            "Device", "MCA",
2610                            "SRC", "INC", "EXC");
2611         } else {
2612                 seq_printf(seq,
2613                            "%3d %6.6s 0x%08x "
2614                            "0x%08x %6lu %6lu\n",
2615                            state->dev->ifindex, state->dev->name,
2616                            ntohl(state->im->multiaddr),
2617                            ntohl(psf->sf_inaddr),
2618                            psf->sf_count[MCAST_INCLUDE],
2619                            psf->sf_count[MCAST_EXCLUDE]);
2620         }
2621         return 0;
2622 }
2623
2624 static const struct seq_operations igmp_mcf_seq_ops = {
2625         .start  =       igmp_mcf_seq_start,
2626         .next   =       igmp_mcf_seq_next,
2627         .stop   =       igmp_mcf_seq_stop,
2628         .show   =       igmp_mcf_seq_show,
2629 };
2630
2631 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2632 {
2633         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2634                         sizeof(struct igmp_mcf_iter_state));
2635 }
2636
2637 static const struct file_operations igmp_mcf_seq_fops = {
2638         .owner          =       THIS_MODULE,
2639         .open           =       igmp_mcf_seq_open,
2640         .read           =       seq_read,
2641         .llseek         =       seq_lseek,
2642         .release        =       seq_release_net,
2643 };
2644
2645 static int __net_init igmp_net_init(struct net *net)
2646 {
2647         struct proc_dir_entry *pde;
2648
2649         pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2650         if (!pde)
2651                 goto out_igmp;
2652         pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2653                           &igmp_mcf_seq_fops);
2654         if (!pde)
2655                 goto out_mcfilter;
2656         return 0;
2657
2658 out_mcfilter:
2659         remove_proc_entry("igmp", net->proc_net);
2660 out_igmp:
2661         return -ENOMEM;
2662 }
2663
2664 static void __net_exit igmp_net_exit(struct net *net)
2665 {
2666         remove_proc_entry("mcfilter", net->proc_net);
2667         remove_proc_entry("igmp", net->proc_net);
2668 }
2669
2670 static struct pernet_operations igmp_net_ops = {
2671         .init = igmp_net_init,
2672         .exit = igmp_net_exit,
2673 };
2674
2675 int __init igmp_mc_proc_init(void)
2676 {
2677         return register_pernet_subsys(&igmp_net_ops);
2678 }
2679 #endif