net/ipv4/igmp.c

   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Authors:
  12  *              Alan Cox <alan@lxorguk.ukuu.org.uk>
  13  *
  14  *      This program is free software; you can redistribute it and/or
  15  *      modify it under the terms of the GNU General Public License
  16  *      as published by the Free Software Foundation; either version
  17  *      2 of the License, or (at your option) any later version.
  18  *
  19  *      Fixes:
  20  *
  21  *              Alan Cox        :       Added lots of __inline__ to optimise
  22  *                                      the memory usage of all the tiny little
  23  *                                      functions.
  24  *              Alan Cox        :       Dumped the header building experiment.
  25  *              Alan Cox        :       Minor tweaks ready for multicast routing
  26  *                                      and extended IGMP protocol.
  27  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  28  *                                      writes utterly bogus code otherwise (sigh)
  29  *                                      fixed IGMP loopback to behave in the manner
  30  *                                      desired by mrouted, fixed the fact it has been
  31  *                                      broken since 1.3.6 and cleaned up a few minor
  32  *                                      points.
  33  *
  34  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  35  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  36  *                                      The enhancements are mainly based on Steve Deering's
  37  *                                      ipmulti-3.5 source code.
  38  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  39  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  40  *                                      the mrouted version on that device.
  41  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  42  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  43  *                                      to identify the multicast router version
  44  *                                      and do what the IGMP version 2 specified.
  45  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  46  *              Tsu-Sheng Tsao          if the specified time expired.
  47  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  48  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  49  *              Christian Daudt :       igmp timer wasn't set for local group
  50  *                                      memberships but was being deleted,
  51  *                                      which caused a "del_timer() called
  52  *                                      from %p with timer not initialized\n"
  53  *                                      message (960131).
  54  *              Christian Daudt :       removed del_timer from
  55  *                                      igmp_timer_expire function (960205).
  56  *             Christian Daudt :       igmp_heard_report now only calls
  57  *                                     igmp_timer_expire if tm->running is
  58  *                                     true (960216).
  59  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  60  *                                      igmp_heard_query never trigger. Expiry
  61  *                                      miscalculation fixed in igmp_heard_query
  62  *                                      and random() made to return unsigned to
  63  *                                      prevent negative expiry times.
  64  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  65  *                                      fix from pending 2.1.x patches.
  66  *              Alan Cox:               Forget to enable FDDI support earlier.
  67  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  68  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  69  *              David L Stevens:        IGMPv3 support, with help from
  70  *                                      Vinay Kulkarni
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/slab.h>
  75 #include <asm/uaccess.h>
  76 #include <linux/types.h>
  77 #include <linux/kernel.h>
  78 #include <linux/jiffies.h>
  79 #include <linux/string.h>
  80 #include <linux/socket.h>
  81 #include <linux/sockios.h>
  82 #include <linux/in.h>
  83 #include <linux/inet.h>
  84 #include <linux/netdevice.h>
  85 #include <linux/skbuff.h>
  86 #include <linux/inetdevice.h>
  87 #include <linux/igmp.h>
  88 #include <linux/if_arp.h>
  89 #include <linux/rtnetlink.h>
  90 #include <linux/times.h>
  91 #include <linux/pkt_sched.h>
  92
  93 #include <net/net_namespace.h>
  94 #include <net/arp.h>
  95 #include <net/ip.h>
  96 #include <net/protocol.h>
  97 #include <net/route.h>
  98 #include <net/sock.h>
  99 #include <net/checksum.h>
 100 #include <linux/netfilter_ipv4.h>
 101 #ifdef CONFIG_IP_MROUTE
 102 #include <linux/mroute.h>
 103 #endif
 104 #ifdef CONFIG_PROC_FS
 105 #include <linux/proc_fs.h>
 106 #include <linux/seq_file.h>
 107 #endif
 108
 109 #define IP_MAX_MEMBERSHIPS      20
 110 #define IP_MAX_MSF              10
 111
 112 #ifdef CONFIG_IP_MULTICAST
 113 /* Parameter names and values are taken from igmp-v2-06 draft */
 114
 115 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 116 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 117 #define IGMP_V2_Unsolicited_Report_Interval     (10*HZ)
 118 #define IGMP_V3_Unsolicited_Report_Interval     (1*HZ)
 119 #define IGMP_Query_Response_Interval            (10*HZ)
 120 #define IGMP_Unsolicited_Report_Count           2
 121
 122
 123 #define IGMP_Initial_Report_Delay               (1)
 124
 125 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 126  * IGMP specs require to report membership immediately after
 127  * joining a group, but we delay the first report by a
 128  * small interval. It seems more natural and still does not
 129  * contradict to specs provided this delay is small enough.
 130  */
 131
 132 #define IGMP_V1_SEEN(in_dev) \
 133         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 134          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 135          ((in_dev)->mr_v1_seen && \
 136           time_before(jiffies, (in_dev)->mr_v1_seen)))
 137 #define IGMP_V2_SEEN(in_dev) \
 138         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 139          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 140          ((in_dev)->mr_v2_seen && \
 141           time_before(jiffies, (in_dev)->mr_v2_seen)))
 142
 143 static int unsolicited_report_interval(struct in_device *in_dev)
 144 {
 145         int interval_ms, interval_jiffies;
 146
 147         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 148                 interval_ms = IN_DEV_CONF_GET(
 149                         in_dev,
 150                         IGMPV2_UNSOLICITED_REPORT_INTERVAL);
 151         else /* v3 */
 152                 interval_ms = IN_DEV_CONF_GET(
 153                         in_dev,
 154                         IGMPV3_UNSOLICITED_REPORT_INTERVAL);
 155
 156         interval_jiffies = msecs_to_jiffies(interval_ms);
 157
 158         /* _timer functions can't handle a delay of 0 jiffies so ensure
 159          *  we always return a positive value.
 160          */
 161         if (interval_jiffies <= 0)
 162                 interval_jiffies = 1;
 163         return interval_jiffies;
 164 }
 165
 166 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 167 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 168 static void igmpv3_clear_delrec(struct in_device *in_dev);
 169 static int sf_setstate(struct ip_mc_list *pmc);
 170 static void sf_markstate(struct ip_mc_list *pmc);
 171 #endif
 172 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 173 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 174                          int sfcount, __be32 *psfsrc, int delta);
 175
 176 static void ip_ma_put(struct ip_mc_list *im)
 177 {
 178         if (atomic_dec_and_test(&im->refcnt)) {
 179                 in_dev_put(im->interface);
 180                 kfree_rcu(im, rcu);
 181         }
 182 }
 183
 184 #define for_each_pmc_rcu(in_dev, pmc)                           \
 185         for (pmc = rcu_dereference(in_dev->mc_list);            \
 186              pmc != NULL;                                       \
 187              pmc = rcu_dereference(pmc->next_rcu))
 188
 189 #define for_each_pmc_rtnl(in_dev, pmc)                          \
 190         for (pmc = rtnl_dereference(in_dev->mc_list);           \
 191              pmc != NULL;                                       \
 192              pmc = rtnl_dereference(pmc->next_rcu))
 193
 194 #ifdef CONFIG_IP_MULTICAST
 195
 196 /*
 197  *      Timer management
 198  */
 199
 200 static void igmp_stop_timer(struct ip_mc_list *im)
 201 {
 202         spin_lock_bh(&im->lock);
 203         if (del_timer(&im->timer))
 204                 atomic_dec(&im->refcnt);
 205         im->tm_running = 0;
 206         im->reporter = 0;
 207         im->unsolicit_count = 0;
 208         spin_unlock_bh(&im->lock);
 209 }
 210
 211 /* It must be called with locked im->lock */
 212 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 213 {
 214         int tv = prandom_u32() % max_delay;
 215
 216         im->tm_running = 1;
 217         if (!mod_timer(&im->timer, jiffies+tv+2))
 218                 atomic_inc(&im->refcnt);
 219 }
 220
 221 static void igmp_gq_start_timer(struct in_device *in_dev)
 222 {
 223         int tv = prandom_u32() % in_dev->mr_maxdelay;
 224
 225         in_dev->mr_gq_running = 1;
 226         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 227                 in_dev_hold(in_dev);
 228 }
 229
 230 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 231 {
 232         int tv = prandom_u32() % delay;
 233
 234         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 235                 in_dev_hold(in_dev);
 236 }
 237
 238 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 239 {
 240         spin_lock_bh(&im->lock);
 241         im->unsolicit_count = 0;
 242         if (del_timer(&im->timer)) {
 243                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 244                         add_timer(&im->timer);
 245                         im->tm_running = 1;
 246                         spin_unlock_bh(&im->lock);
 247                         return;
 248                 }
 249                 atomic_dec(&im->refcnt);
 250         }
 251         igmp_start_timer(im, max_delay);
 252         spin_unlock_bh(&im->lock);
 253 }
 254
 255
 256 /*
 257  *      Send an IGMP report.
 258  */
 259
 260 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 261
 262
 263 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 264         int gdeleted, int sdeleted)
 265 {
 266         switch (type) {
 267         case IGMPV3_MODE_IS_INCLUDE:
 268         case IGMPV3_MODE_IS_EXCLUDE:
 269                 if (gdeleted || sdeleted)
 270                         return 0;
 271                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 272                         if (pmc->sfmode == MCAST_INCLUDE)
 273                                 return 1;
 274                         /* don't include if this source is excluded
 275                          * in all filters
 276                          */
 277                         if (psf->sf_count[MCAST_INCLUDE])
 278                                 return type == IGMPV3_MODE_IS_INCLUDE;
 279                         return pmc->sfcount[MCAST_EXCLUDE] ==
 280                                 psf->sf_count[MCAST_EXCLUDE];
 281                 }
 282                 return 0;
 283         case IGMPV3_CHANGE_TO_INCLUDE:
 284                 if (gdeleted || sdeleted)
 285                         return 0;
 286                 return psf->sf_count[MCAST_INCLUDE] != 0;
 287         case IGMPV3_CHANGE_TO_EXCLUDE:
 288                 if (gdeleted || sdeleted)
 289                         return 0;
 290                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 291                     psf->sf_count[MCAST_INCLUDE])
 292                         return 0;
 293                 return pmc->sfcount[MCAST_EXCLUDE] ==
 294                         psf->sf_count[MCAST_EXCLUDE];
 295         case IGMPV3_ALLOW_NEW_SOURCES:
 296                 if (gdeleted || !psf->sf_crcount)
 297                         return 0;
 298                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 299         case IGMPV3_BLOCK_OLD_SOURCES:
 300                 if (pmc->sfmode == MCAST_INCLUDE)
 301                         return gdeleted || (psf->sf_crcount && sdeleted);
 302                 return psf->sf_crcount && !gdeleted && !sdeleted;
 303         }
 304         return 0;
 305 }
 306
 307 static int
 308 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 309 {
 310         struct ip_sf_list *psf;
 311         int scount = 0;
 312
 313         for (psf = pmc->sources; psf; psf = psf->sf_next) {
 314                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 315                         continue;
 316                 scount++;
 317         }
 318         return scount;
 319 }
 320
 321 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
 322
 323 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 324 {
 325         struct sk_buff *skb;
 326         struct rtable *rt;
 327         struct iphdr *pip;
 328         struct igmpv3_report *pig;
 329         struct net *net = dev_net(dev);
 330         struct flowi4 fl4;
 331         int hlen = LL_RESERVED_SPACE(dev);
 332         int tlen = dev->needed_tailroom;
 333
 334         while (1) {
 335                 skb = alloc_skb(size + hlen + tlen,
 336                                 GFP_ATOMIC | __GFP_NOWARN);
 337                 if (skb)
 338                         break;
 339                 size >>= 1;
 340                 if (size < 256)
 341                         return NULL;
 342         }
 343         skb->priority = TC_PRIO_CONTROL;
 344         igmp_skb_size(skb) = size;
 345
 346         rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
 347                                    0, 0,
 348                                    IPPROTO_IGMP, 0, dev->ifindex);
 349         if (IS_ERR(rt)) {
 350                 kfree_skb(skb);
 351                 return NULL;
 352         }
 353
 354         skb_dst_set(skb, &rt->dst);
 355         skb->dev = dev;
 356
 357         skb_reserve(skb, hlen);
 358
 359         skb_reset_network_header(skb);
 360         pip = ip_hdr(skb);
 361         skb_put(skb, sizeof(struct iphdr) + 4);
 362
 363         pip->version  = 4;
 364         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 365         pip->tos      = 0xc0;
 366         pip->frag_off = htons(IP_DF);
 367         pip->ttl      = 1;
 368         pip->daddr    = fl4.daddr;
 369         pip->saddr    = fl4.saddr;
 370         pip->protocol = IPPROTO_IGMP;
 371         pip->tot_len  = 0;      /* filled in later */
 372         ip_select_ident(skb, NULL);
 373         ((u8 *)&pip[1])[0] = IPOPT_RA;
 374         ((u8 *)&pip[1])[1] = 4;
 375         ((u8 *)&pip[1])[2] = 0;
 376         ((u8 *)&pip[1])[3] = 0;
 377
 378         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 379         skb_put(skb, sizeof(*pig));
 380         pig = igmpv3_report_hdr(skb);
 381         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 382         pig->resv1 = 0;
 383         pig->csum = 0;
 384         pig->resv2 = 0;
 385         pig->ngrec = 0;
 386         return skb;
 387 }
 388
 389 static int igmpv3_sendpack(struct sk_buff *skb)
 390 {
 391         struct igmphdr *pig = igmp_hdr(skb);
 392         const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
 393
 394         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 395
 396         return ip_local_out(skb);
 397 }
 398
 399 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 400 {
 401         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
 402 }
 403
 404 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 405         int type, struct igmpv3_grec **ppgr)
 406 {
 407         struct net_device *dev = pmc->interface->dev;
 408         struct igmpv3_report *pih;
 409         struct igmpv3_grec *pgr;
 410
 411         if (!skb)
 412                 skb = igmpv3_newpack(dev, dev->mtu);
 413         if (!skb)
 414                 return NULL;
 415         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 416         pgr->grec_type = type;
 417         pgr->grec_auxwords = 0;
 418         pgr->grec_nsrcs = 0;
 419         pgr->grec_mca = pmc->multiaddr;
 420         pih = igmpv3_report_hdr(skb);
 421         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 422         *ppgr = pgr;
 423         return skb;
 424 }
 425
 426 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
 427         skb_tailroom(skb)) : 0)
 428
 429 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 430         int type, int gdeleted, int sdeleted)
 431 {
 432         struct net_device *dev = pmc->interface->dev;
 433         struct igmpv3_report *pih;
 434         struct igmpv3_grec *pgr = NULL;
 435         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 436         int scount, stotal, first, isquery, truncate;
 437
 438         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 439                 return skb;
 440
 441         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 442                   type == IGMPV3_MODE_IS_EXCLUDE;
 443         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 444                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 445
 446         stotal = scount = 0;
 447
 448         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 449
 450         if (!*psf_list)
 451                 goto empty_source;
 452
 453         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 454
 455         /* EX and TO_EX get a fresh packet, if needed */
 456         if (truncate) {
 457                 if (pih && pih->ngrec &&
 458                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 459                         if (skb)
 460                                 igmpv3_sendpack(skb);
 461                         skb = igmpv3_newpack(dev, dev->mtu);
 462                 }
 463         }
 464         first = 1;
 465         psf_prev = NULL;
 466         for (psf = *psf_list; psf; psf = psf_next) {
 467                 __be32 *psrc;
 468
 469                 psf_next = psf->sf_next;
 470
 471                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 472                         psf_prev = psf;
 473                         continue;
 474                 }
 475
 476                 /* clear marks on query responses */
 477                 if (isquery)
 478                         psf->sf_gsresp = 0;
 479
 480                 if (AVAILABLE(skb) < sizeof(__be32) +
 481                     first*sizeof(struct igmpv3_grec)) {
 482                         if (truncate && !first)
 483                                 break;   /* truncate these */
 484                         if (pgr)
 485                                 pgr->grec_nsrcs = htons(scount);
 486                         if (skb)
 487                                 igmpv3_sendpack(skb);
 488                         skb = igmpv3_newpack(dev, dev->mtu);
 489                         first = 1;
 490                         scount = 0;
 491                 }
 492                 if (first) {
 493                         skb = add_grhead(skb, pmc, type, &pgr);
 494                         first = 0;
 495                 }
 496                 if (!skb)
 497                         return NULL;
 498                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 499                 *psrc = psf->sf_inaddr;
 500                 scount++; stotal++;
 501                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 502                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 503                         psf->sf_crcount--;
 504                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 505                                 if (psf_prev)
 506                                         psf_prev->sf_next = psf->sf_next;
 507                                 else
 508                                         *psf_list = psf->sf_next;
 509                                 kfree(psf);
 510                                 continue;
 511                         }
 512                 }
 513                 psf_prev = psf;
 514         }
 515
 516 empty_source:
 517         if (!stotal) {
 518                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 519                     type == IGMPV3_BLOCK_OLD_SOURCES)
 520                         return skb;
 521                 if (pmc->crcount || isquery) {
 522                         /* make sure we have room for group header */
 523                         if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
 524                                 igmpv3_sendpack(skb);
 525                                 skb = NULL; /* add_grhead will get a new one */
 526                         }
 527                         skb = add_grhead(skb, pmc, type, &pgr);
 528                 }
 529         }
 530         if (pgr)
 531                 pgr->grec_nsrcs = htons(scount);
 532
 533         if (isquery)
 534                 pmc->gsquery = 0;       /* clear query state on report */
 535         return skb;
 536 }
 537
 538 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 539 {
 540         struct sk_buff *skb = NULL;
 541         int type;
 542
 543         if (!pmc) {
 544                 rcu_read_lock();
 545                 for_each_pmc_rcu(in_dev, pmc) {
 546                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 547                                 continue;
 548                         spin_lock_bh(&pmc->lock);
 549                         if (pmc->sfcount[MCAST_EXCLUDE])
 550                                 type = IGMPV3_MODE_IS_EXCLUDE;
 551                         else
 552                                 type = IGMPV3_MODE_IS_INCLUDE;
 553                         skb = add_grec(skb, pmc, type, 0, 0);
 554                         spin_unlock_bh(&pmc->lock);
 555                 }
 556                 rcu_read_unlock();
 557         } else {
 558                 spin_lock_bh(&pmc->lock);
 559                 if (pmc->sfcount[MCAST_EXCLUDE])
 560                         type = IGMPV3_MODE_IS_EXCLUDE;
 561                 else
 562                         type = IGMPV3_MODE_IS_INCLUDE;
 563                 skb = add_grec(skb, pmc, type, 0, 0);
 564                 spin_unlock_bh(&pmc->lock);
 565         }
 566         if (!skb)
 567                 return 0;
 568         return igmpv3_sendpack(skb);
 569 }
 570
 571 /*
 572  * remove zero-count source records from a source filter list
 573  */
 574 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 575 {
 576         struct ip_sf_list *psf_prev, *psf_next, *psf;
 577
 578         psf_prev = NULL;
 579         for (psf = *ppsf; psf; psf = psf_next) {
 580                 psf_next = psf->sf_next;
 581                 if (psf->sf_crcount == 0) {
 582                         if (psf_prev)
 583                                 psf_prev->sf_next = psf->sf_next;
 584                         else
 585                                 *ppsf = psf->sf_next;
 586                         kfree(psf);
 587                 } else
 588                         psf_prev = psf;
 589         }
 590 }
 591
 592 static void igmpv3_send_cr(struct in_device *in_dev)
 593 {
 594         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 595         struct sk_buff *skb = NULL;
 596         int type, dtype;
 597
 598         rcu_read_lock();
 599         spin_lock_bh(&in_dev->mc_tomb_lock);
 600
 601         /* deleted MCA's */
 602         pmc_prev = NULL;
 603         for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
 604                 pmc_next = pmc->next;
 605                 if (pmc->sfmode == MCAST_INCLUDE) {
 606                         type = IGMPV3_BLOCK_OLD_SOURCES;
 607                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 608                         skb = add_grec(skb, pmc, type, 1, 0);
 609                         skb = add_grec(skb, pmc, dtype, 1, 1);
 610                 }
 611                 if (pmc->crcount) {
 612                         if (pmc->sfmode == MCAST_EXCLUDE) {
 613                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 614                                 skb = add_grec(skb, pmc, type, 1, 0);
 615                         }
 616                         pmc->crcount--;
 617                         if (pmc->crcount == 0) {
 618                                 igmpv3_clear_zeros(&pmc->tomb);
 619                                 igmpv3_clear_zeros(&pmc->sources);
 620                         }
 621                 }
 622                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 623                         if (pmc_prev)
 624                                 pmc_prev->next = pmc_next;
 625                         else
 626                                 in_dev->mc_tomb = pmc_next;
 627                         in_dev_put(pmc->interface);
 628                         kfree(pmc);
 629                 } else
 630                         pmc_prev = pmc;
 631         }
 632         spin_unlock_bh(&in_dev->mc_tomb_lock);
 633
 634         /* change recs */
 635         for_each_pmc_rcu(in_dev, pmc) {
 636                 spin_lock_bh(&pmc->lock);
 637                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 638                         type = IGMPV3_BLOCK_OLD_SOURCES;
 639                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 640                 } else {
 641                         type = IGMPV3_ALLOW_NEW_SOURCES;
 642                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 643                 }
 644                 skb = add_grec(skb, pmc, type, 0, 0);
 645                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 646
 647                 /* filter mode changes */
 648                 if (pmc->crcount) {
 649                         if (pmc->sfmode == MCAST_EXCLUDE)
 650                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 651                         else
 652                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 653                         skb = add_grec(skb, pmc, type, 0, 0);
 654                         pmc->crcount--;
 655                 }
 656                 spin_unlock_bh(&pmc->lock);
 657         }
 658         rcu_read_unlock();
 659
 660         if (!skb)
 661                 return;
 662         (void) igmpv3_sendpack(skb);
 663 }
 664
 665 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 666         int type)
 667 {
 668         struct sk_buff *skb;
 669         struct iphdr *iph;
 670         struct igmphdr *ih;
 671         struct rtable *rt;
 672         struct net_device *dev = in_dev->dev;
 673         struct net *net = dev_net(dev);
 674         __be32  group = pmc ? pmc->multiaddr : 0;
 675         struct flowi4 fl4;
 676         __be32  dst;
 677         int hlen, tlen;
 678
 679         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 680                 return igmpv3_send_report(in_dev, pmc);
 681         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 682                 dst = IGMP_ALL_ROUTER;
 683         else
 684                 dst = group;
 685
 686         rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
 687                                    0, 0,
 688                                    IPPROTO_IGMP, 0, dev->ifindex);
 689         if (IS_ERR(rt))
 690                 return -1;
 691
 692         hlen = LL_RESERVED_SPACE(dev);
 693         tlen = dev->needed_tailroom;
 694         skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
 695         if (skb == NULL) {
 696                 ip_rt_put(rt);
 697                 return -1;
 698         }
 699         skb->priority = TC_PRIO_CONTROL;
 700
 701         skb_dst_set(skb, &rt->dst);
 702
 703         skb_reserve(skb, hlen);
 704
 705         skb_reset_network_header(skb);
 706         iph = ip_hdr(skb);
 707         skb_put(skb, sizeof(struct iphdr) + 4);
 708
 709         iph->version  = 4;
 710         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 711         iph->tos      = 0xc0;
 712         iph->frag_off = htons(IP_DF);
 713         iph->ttl      = 1;
 714         iph->daddr    = dst;
 715         iph->saddr    = fl4.saddr;
 716         iph->protocol = IPPROTO_IGMP;
 717         ip_select_ident(skb, NULL);
 718         ((u8 *)&iph[1])[0] = IPOPT_RA;
 719         ((u8 *)&iph[1])[1] = 4;
 720         ((u8 *)&iph[1])[2] = 0;
 721         ((u8 *)&iph[1])[3] = 0;
 722
 723         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 724         ih->type = type;
 725         ih->code = 0;
 726         ih->csum = 0;
 727         ih->group = group;
 728         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 729
 730         return ip_local_out(skb);
 731 }
 732
 733 static void igmp_gq_timer_expire(unsigned long data)
 734 {
 735         struct in_device *in_dev = (struct in_device *)data;
 736
 737         in_dev->mr_gq_running = 0;
 738         igmpv3_send_report(in_dev, NULL);
 739         in_dev_put(in_dev);
 740 }
 741
 742 static void igmp_ifc_timer_expire(unsigned long data)
 743 {
 744         struct in_device *in_dev = (struct in_device *)data;
 745
 746         igmpv3_send_cr(in_dev);
 747         if (in_dev->mr_ifc_count) {
 748                 in_dev->mr_ifc_count--;
 749                 igmp_ifc_start_timer(in_dev,
 750                                      unsolicited_report_interval(in_dev));
 751         }
 752         in_dev_put(in_dev);
 753 }
 754
 755 static void igmp_ifc_event(struct in_device *in_dev)
 756 {
 757         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 758                 return;
 759         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 760                 IGMP_Unsolicited_Report_Count;
 761         igmp_ifc_start_timer(in_dev, 1);
 762 }
 763
 764
 765 static void igmp_timer_expire(unsigned long data)
 766 {
 767         struct ip_mc_list *im = (struct ip_mc_list *)data;
 768         struct in_device *in_dev = im->interface;
 769
 770         spin_lock(&im->lock);
 771         im->tm_running = 0;
 772
 773         if (im->unsolicit_count) {
 774                 im->unsolicit_count--;
 775                 igmp_start_timer(im, unsolicited_report_interval(in_dev));
 776         }
 777         im->reporter = 1;
 778         spin_unlock(&im->lock);
 779
 780         if (IGMP_V1_SEEN(in_dev))
 781                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 782         else if (IGMP_V2_SEEN(in_dev))
 783                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 784         else
 785                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 786
 787         ip_ma_put(im);
 788 }
 789
 790 /* mark EXCLUDE-mode sources */
 791 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 792 {
 793         struct ip_sf_list *psf;
 794         int i, scount;
 795
 796         scount = 0;
 797         for (psf = pmc->sources; psf; psf = psf->sf_next) {
 798                 if (scount == nsrcs)
 799                         break;
 800                 for (i = 0; i < nsrcs; i++) {
 801                         /* skip inactive filters */
 802                         if (psf->sf_count[MCAST_INCLUDE] ||
 803                             pmc->sfcount[MCAST_EXCLUDE] !=
 804                             psf->sf_count[MCAST_EXCLUDE])
 805                                 break;
 806                         if (srcs[i] == psf->sf_inaddr) {
 807                                 scount++;
 808                                 break;
 809                         }
 810                 }
 811         }
 812         pmc->gsquery = 0;
 813         if (scount == nsrcs)    /* all sources excluded */
 814                 return 0;
 815         return 1;
 816 }
 817
 818 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 819 {
 820         struct ip_sf_list *psf;
 821         int i, scount;
 822
 823         if (pmc->sfmode == MCAST_EXCLUDE)
 824                 return igmp_xmarksources(pmc, nsrcs, srcs);
 825
 826         /* mark INCLUDE-mode sources */
 827         scount = 0;
 828         for (psf = pmc->sources; psf; psf = psf->sf_next) {
 829                 if (scount == nsrcs)
 830                         break;
 831                 for (i = 0; i < nsrcs; i++)
 832                         if (srcs[i] == psf->sf_inaddr) {
 833                                 psf->sf_gsresp = 1;
 834                                 scount++;
 835                                 break;
 836                         }
 837         }
 838         if (!scount) {
 839                 pmc->gsquery = 0;
 840                 return 0;
 841         }
 842         pmc->gsquery = 1;
 843         return 1;
 844 }
 845
 846 /* return true if packet was dropped */
 847 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
 848 {
 849         struct ip_mc_list *im;
 850
 851         /* Timers are only set for non-local groups */
 852
 853         if (group == IGMP_ALL_HOSTS)
 854                 return false;
 855
 856         rcu_read_lock();
 857         for_each_pmc_rcu(in_dev, im) {
 858                 if (im->multiaddr == group) {
 859                         igmp_stop_timer(im);
 860                         break;
 861                 }
 862         }
 863         rcu_read_unlock();
 864         return false;
 865 }
 866
 867 /* return true if packet was dropped */
 868 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 869         int len)
 870 {
 871         struct igmphdr          *ih = igmp_hdr(skb);
 872         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 873         struct ip_mc_list       *im;
 874         __be32                  group = ih->group;
 875         int                     max_delay;
 876         int                     mark = 0;
 877
 878
 879         if (len == 8) {
 880                 if (ih->code == 0) {
 881                         /* Alas, old v1 router presents here. */
 882
 883                         max_delay = IGMP_Query_Response_Interval;
 884                         in_dev->mr_v1_seen = jiffies +
 885                                 IGMP_V1_Router_Present_Timeout;
 886                         group = 0;
 887                 } else {
 888                         /* v2 router present */
 889                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 890                         in_dev->mr_v2_seen = jiffies +
 891                                 IGMP_V2_Router_Present_Timeout;
 892                 }
 893                 /* cancel the interface change timer */
 894                 in_dev->mr_ifc_count = 0;
 895                 if (del_timer(&in_dev->mr_ifc_timer))
 896                         __in_dev_put(in_dev);
 897                 /* clear deleted report items */
 898                 igmpv3_clear_delrec(in_dev);
 899         } else if (len < 12) {
 900                 return true;    /* ignore bogus packet; freed by caller */
 901         } else if (IGMP_V1_SEEN(in_dev)) {
 902                 /* This is a v3 query with v1 queriers present */
 903                 max_delay = IGMP_Query_Response_Interval;
 904                 group = 0;
 905         } else if (IGMP_V2_SEEN(in_dev)) {
 906                 /* this is a v3 query with v2 queriers present;
 907                  * Interpretation of the max_delay code is problematic here.
 908                  * A real v2 host would use ih_code directly, while v3 has a
 909                  * different encoding. We use the v3 encoding as more likely
 910                  * to be intended in a v3 query.
 911                  */
 912                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 913                 if (!max_delay)
 914                         max_delay = 1;  /* can't mod w/ 0 */
 915         } else { /* v3 */
 916                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 917                         return true;
 918
 919                 ih3 = igmpv3_query_hdr(skb);
 920                 if (ih3->nsrcs) {
 921                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 922                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 923                                 return true;
 924                         ih3 = igmpv3_query_hdr(skb);
 925                 }
 926
 927                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 928                 if (!max_delay)
 929                         max_delay = 1;  /* can't mod w/ 0 */
 930                 in_dev->mr_maxdelay = max_delay;
 931                 if (ih3->qrv)
 932                         in_dev->mr_qrv = ih3->qrv;
 933                 if (!group) { /* general query */
 934                         if (ih3->nsrcs)
 935                                 return false;   /* no sources allowed */
 936                         igmp_gq_start_timer(in_dev);
 937                         return false;
 938                 }
 939                 /* mark sources to include, if group & source-specific */
 940                 mark = ih3->nsrcs != 0;
 941         }
 942
 943         /*
 944          * - Start the timers in all of our membership records
 945          *   that the query applies to for the interface on
 946          *   which the query arrived excl. those that belong
 947          *   to a "local" group (224.0.0.X)
 948          * - For timers already running check if they need to
 949          *   be reset.
 950          * - Use the igmp->igmp_code field as the maximum
 951          *   delay possible
 952          */
 953         rcu_read_lock();
 954         for_each_pmc_rcu(in_dev, im) {
 955                 int changed;
 956
 957                 if (group && group != im->multiaddr)
 958                         continue;
 959                 if (im->multiaddr == IGMP_ALL_HOSTS)
 960                         continue;
 961                 spin_lock_bh(&im->lock);
 962                 if (im->tm_running)
 963                         im->gsquery = im->gsquery && mark;
 964                 else
 965                         im->gsquery = mark;
 966                 changed = !im->gsquery ||
 967                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 968                 spin_unlock_bh(&im->lock);
 969                 if (changed)
 970                         igmp_mod_timer(im, max_delay);
 971         }
 972         rcu_read_unlock();
 973         return false;
 974 }
 975
 976 /* called in rcu_read_lock() section */
 977 int igmp_rcv(struct sk_buff *skb)
 978 {
 979         /* This basically follows the spec line by line -- see RFC1112 */
 980         struct igmphdr *ih;
 981         struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
 982         int len = skb->len;
 983         bool dropped = true;
 984
 985         if (in_dev == NULL)
 986                 goto drop;
 987
 988         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 989                 goto drop;
 990
 991         if (skb_checksum_simple_validate(skb))
 992                 goto drop;
 993
 994         ih = igmp_hdr(skb);
 995         switch (ih->type) {
 996         case IGMP_HOST_MEMBERSHIP_QUERY:
 997                 dropped = igmp_heard_query(in_dev, skb, len);
 998                 break;
 999         case IGMP_HOST_MEMBERSHIP_REPORT:
1000         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1001                 /* Is it our report looped back? */
1002                 if (rt_is_output_route(skb_rtable(skb)))
1003                         break;
1004                 /* don't rely on MC router hearing unicast reports */
1005                 if (skb->pkt_type == PACKET_MULTICAST ||
1006                     skb->pkt_type == PACKET_BROADCAST)
1007                         dropped = igmp_heard_report(in_dev, ih->group);
1008                 break;
1009         case IGMP_PIM:
1010 #ifdef CONFIG_IP_PIMSM_V1
1011                 return pim_rcv_v1(skb);
1012 #endif
1013         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1014         case IGMP_DVMRP:
1015         case IGMP_TRACE:
1016         case IGMP_HOST_LEAVE_MESSAGE:
1017         case IGMP_MTRACE:
1018         case IGMP_MTRACE_RESP:
1019                 break;
1020         default:
1021                 break;
1022         }
1023
1024 drop:
1025         if (dropped)
1026                 kfree_skb(skb);
1027         else
1028                 consume_skb(skb);
1029         return 0;
1030 }
1031
1032 #endif
1033
1034
1035 /*
1036  *      Add a filter to a device
1037  */
1038
1039 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1040 {
1041         char buf[MAX_ADDR_LEN];
1042         struct net_device *dev = in_dev->dev;
1043
1044         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1045            We will get multicast token leakage, when IFF_MULTICAST
1046            is changed. This check should be done in ndo_set_rx_mode
1047            routine. Something sort of:
1048            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1049            --ANK
1050            */
1051         if (arp_mc_map(addr, buf, dev, 0) == 0)
1052                 dev_mc_add(dev, buf);
1053 }
1054
1055 /*
1056  *      Remove a filter from a device
1057  */
1058
1059 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1060 {
1061         char buf[MAX_ADDR_LEN];
1062         struct net_device *dev = in_dev->dev;
1063
1064         if (arp_mc_map(addr, buf, dev, 0) == 0)
1065                 dev_mc_del(dev, buf);
1066 }
1067
1068 #ifdef CONFIG_IP_MULTICAST
1069 /*
1070  * deleted ip_mc_list manipulation
1071  */
1072 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1073 {
1074         struct ip_mc_list *pmc;
1075
1076         /* this is an "ip_mc_list" for convenience; only the fields below
1077          * are actually used. In particular, the refcnt and users are not
1078          * used for management of the delete list. Using the same structure
1079          * for deleted items allows change reports to use common code with
1080          * non-deleted or query-response MCA's.
1081          */
1082         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1083         if (!pmc)
1084                 return;
1085         spin_lock_bh(&im->lock);
1086         pmc->interface = im->interface;
1087         in_dev_hold(in_dev);
1088         pmc->multiaddr = im->multiaddr;
1089         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1090                 IGMP_Unsolicited_Report_Count;
1091         pmc->sfmode = im->sfmode;
1092         if (pmc->sfmode == MCAST_INCLUDE) {
1093                 struct ip_sf_list *psf;
1094
1095                 pmc->tomb = im->tomb;
1096                 pmc->sources = im->sources;
1097                 im->tomb = im->sources = NULL;
1098                 for (psf = pmc->sources; psf; psf = psf->sf_next)
1099                         psf->sf_crcount = pmc->crcount;
1100         }
1101         spin_unlock_bh(&im->lock);
1102
1103         spin_lock_bh(&in_dev->mc_tomb_lock);
1104         pmc->next = in_dev->mc_tomb;
1105         in_dev->mc_tomb = pmc;
1106         spin_unlock_bh(&in_dev->mc_tomb_lock);
1107 }
1108
1109 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1110 {
1111         struct ip_mc_list *pmc, *pmc_prev;
1112         struct ip_sf_list *psf, *psf_next;
1113
1114         spin_lock_bh(&in_dev->mc_tomb_lock);
1115         pmc_prev = NULL;
1116         for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1117                 if (pmc->multiaddr == multiaddr)
1118                         break;
1119                 pmc_prev = pmc;
1120         }
1121         if (pmc) {
1122                 if (pmc_prev)
1123                         pmc_prev->next = pmc->next;
1124                 else
1125                         in_dev->mc_tomb = pmc->next;
1126         }
1127         spin_unlock_bh(&in_dev->mc_tomb_lock);
1128         if (pmc) {
1129                 for (psf = pmc->tomb; psf; psf = psf_next) {
1130                         psf_next = psf->sf_next;
1131                         kfree(psf);
1132                 }
1133                 in_dev_put(pmc->interface);
1134                 kfree(pmc);
1135         }
1136 }
1137
1138 static void igmpv3_clear_delrec(struct in_device *in_dev)
1139 {
1140         struct ip_mc_list *pmc, *nextpmc;
1141
1142         spin_lock_bh(&in_dev->mc_tomb_lock);
1143         pmc = in_dev->mc_tomb;
1144         in_dev->mc_tomb = NULL;
1145         spin_unlock_bh(&in_dev->mc_tomb_lock);
1146
1147         for (; pmc; pmc = nextpmc) {
1148                 nextpmc = pmc->next;
1149                 ip_mc_clear_src(pmc);
1150                 in_dev_put(pmc->interface);
1151                 kfree(pmc);
1152         }
1153         /* clear dead sources, too */
1154         rcu_read_lock();
1155         for_each_pmc_rcu(in_dev, pmc) {
1156                 struct ip_sf_list *psf, *psf_next;
1157
1158                 spin_lock_bh(&pmc->lock);
1159                 psf = pmc->tomb;
1160                 pmc->tomb = NULL;
1161                 spin_unlock_bh(&pmc->lock);
1162                 for (; psf; psf = psf_next) {
1163                         psf_next = psf->sf_next;
1164                         kfree(psf);
1165                 }
1166         }
1167         rcu_read_unlock();
1168 }
1169 #endif
1170
1171 static void igmp_group_dropped(struct ip_mc_list *im)
1172 {
1173         struct in_device *in_dev = im->interface;
1174 #ifdef CONFIG_IP_MULTICAST
1175         int reporter;
1176 #endif
1177
1178         if (im->loaded) {
1179                 im->loaded = 0;
1180                 ip_mc_filter_del(in_dev, im->multiaddr);
1181         }
1182
1183 #ifdef CONFIG_IP_MULTICAST
1184         if (im->multiaddr == IGMP_ALL_HOSTS)
1185                 return;
1186
1187         reporter = im->reporter;
1188         igmp_stop_timer(im);
1189
1190         if (!in_dev->dead) {
1191                 if (IGMP_V1_SEEN(in_dev))
1192                         return;
1193                 if (IGMP_V2_SEEN(in_dev)) {
1194                         if (reporter)
1195                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1196                         return;
1197                 }
1198                 /* IGMPv3 */
1199                 igmpv3_add_delrec(in_dev, im);
1200
1201                 igmp_ifc_event(in_dev);
1202         }
1203 #endif
1204 }
1205
1206 static void igmp_group_added(struct ip_mc_list *im)
1207 {
1208         struct in_device *in_dev = im->interface;
1209
1210         if (im->loaded == 0) {
1211                 im->loaded = 1;
1212                 ip_mc_filter_add(in_dev, im->multiaddr);
1213         }
1214
1215 #ifdef CONFIG_IP_MULTICAST
1216         if (im->multiaddr == IGMP_ALL_HOSTS)
1217                 return;
1218
1219         if (in_dev->dead)
1220                 return;
1221         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1222                 spin_lock_bh(&im->lock);
1223                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1224                 spin_unlock_bh(&im->lock);
1225                 return;
1226         }
1227         /* else, v3 */
1228
1229         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1230                 IGMP_Unsolicited_Report_Count;
1231         igmp_ifc_event(in_dev);
1232 #endif
1233 }
1234
1235
1236 /*
1237  *      Multicast list managers
1238  */
1239
1240 static u32 ip_mc_hash(const struct ip_mc_list *im)
1241 {
1242         return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1243 }
1244
1245 static void ip_mc_hash_add(struct in_device *in_dev,
1246                            struct ip_mc_list *im)
1247 {
1248         struct ip_mc_list __rcu **mc_hash;
1249         u32 hash;
1250
1251         mc_hash = rtnl_dereference(in_dev->mc_hash);
1252         if (mc_hash) {
1253                 hash = ip_mc_hash(im);
1254                 im->next_hash = mc_hash[hash];
1255                 rcu_assign_pointer(mc_hash[hash], im);
1256                 return;
1257         }
1258
1259         /* do not use a hash table for small number of items */
1260         if (in_dev->mc_count < 4)
1261                 return;
1262
1263         mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1264                           GFP_KERNEL);
1265         if (!mc_hash)
1266                 return;
1267
1268         for_each_pmc_rtnl(in_dev, im) {
1269                 hash = ip_mc_hash(im);
1270                 im->next_hash = mc_hash[hash];
1271                 RCU_INIT_POINTER(mc_hash[hash], im);
1272         }
1273
1274         rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1275 }
1276
1277 static void ip_mc_hash_remove(struct in_device *in_dev,
1278                               struct ip_mc_list *im)
1279 {
1280         struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1281         struct ip_mc_list *aux;
1282
1283         if (!mc_hash)
1284                 return;
1285         mc_hash += ip_mc_hash(im);
1286         while ((aux = rtnl_dereference(*mc_hash)) != im)
1287                 mc_hash = &aux->next_hash;
1288         *mc_hash = im->next_hash;
1289 }
1290
1291
1292 /*
1293  *      A socket has joined a multicast group on device dev.
1294  */
1295
1296 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1297 {
1298         struct ip_mc_list *im;
1299
1300         ASSERT_RTNL();
1301
1302         for_each_pmc_rtnl(in_dev, im) {
1303                 if (im->multiaddr == addr) {
1304                         im->users++;
1305                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1306                         goto out;
1307                 }
1308         }
1309
1310         im = kzalloc(sizeof(*im), GFP_KERNEL);
1311         if (!im)
1312                 goto out;
1313
1314         im->users = 1;
1315         im->interface = in_dev;
1316         in_dev_hold(in_dev);
1317         im->multiaddr = addr;
1318         /* initial mode is (EX, empty) */
1319         im->sfmode = MCAST_EXCLUDE;
1320         im->sfcount[MCAST_EXCLUDE] = 1;
1321         atomic_set(&im->refcnt, 1);
1322         spin_lock_init(&im->lock);
1323 #ifdef CONFIG_IP_MULTICAST
1324         setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1325         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1326 #endif
1327
1328         im->next_rcu = in_dev->mc_list;
1329         in_dev->mc_count++;
1330         rcu_assign_pointer(in_dev->mc_list, im);
1331
1332         ip_mc_hash_add(in_dev, im);
1333
1334 #ifdef CONFIG_IP_MULTICAST
1335         igmpv3_del_delrec(in_dev, im->multiaddr);
1336 #endif
1337         igmp_group_added(im);
1338         if (!in_dev->dead)
1339                 ip_rt_multicast_event(in_dev);
1340 out:
1341         return;
1342 }
1343 EXPORT_SYMBOL(ip_mc_inc_group);
1344
1345 /*
1346  *      Resend IGMP JOIN report; used by netdev notifier.
1347  */
1348 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1349 {
1350 #ifdef CONFIG_IP_MULTICAST
1351         struct ip_mc_list *im;
1352         int type;
1353
1354         ASSERT_RTNL();
1355
1356         for_each_pmc_rtnl(in_dev, im) {
1357                 if (im->multiaddr == IGMP_ALL_HOSTS)
1358                         continue;
1359
1360                 /* a failover is happening and switches
1361                  * must be notified immediately
1362                  */
1363                 if (IGMP_V1_SEEN(in_dev))
1364                         type = IGMP_HOST_MEMBERSHIP_REPORT;
1365                 else if (IGMP_V2_SEEN(in_dev))
1366                         type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1367                 else
1368                         type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1369                 igmp_send_report(in_dev, im, type);
1370         }
1371 #endif
1372 }
1373
1374 /*
1375  *      A socket has left a multicast group on device dev
1376  */
1377
1378 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1379 {
1380         struct ip_mc_list *i;
1381         struct ip_mc_list __rcu **ip;
1382
1383         ASSERT_RTNL();
1384
1385         for (ip = &in_dev->mc_list;
1386              (i = rtnl_dereference(*ip)) != NULL;
1387              ip = &i->next_rcu) {
1388                 if (i->multiaddr == addr) {
1389                         if (--i->users == 0) {
1390                                 ip_mc_hash_remove(in_dev, i);
1391                                 *ip = i->next_rcu;
1392                                 in_dev->mc_count--;
1393                                 igmp_group_dropped(i);
1394                                 ip_mc_clear_src(i);
1395
1396                                 if (!in_dev->dead)
1397                                         ip_rt_multicast_event(in_dev);
1398
1399                                 ip_ma_put(i);
1400                                 return;
1401                         }
1402                         break;
1403                 }
1404         }
1405 }
1406 EXPORT_SYMBOL(ip_mc_dec_group);
1407
1408 /* Device changing type */
1409
1410 void ip_mc_unmap(struct in_device *in_dev)
1411 {
1412         struct ip_mc_list *pmc;
1413
1414         ASSERT_RTNL();
1415
1416         for_each_pmc_rtnl(in_dev, pmc)
1417                 igmp_group_dropped(pmc);
1418 }
1419
1420 void ip_mc_remap(struct in_device *in_dev)
1421 {
1422         struct ip_mc_list *pmc;
1423
1424         ASSERT_RTNL();
1425
1426         for_each_pmc_rtnl(in_dev, pmc)
1427                 igmp_group_added(pmc);
1428 }
1429
1430 /* Device going down */
1431
1432 void ip_mc_down(struct in_device *in_dev)
1433 {
1434         struct ip_mc_list *pmc;
1435
1436         ASSERT_RTNL();
1437
1438         for_each_pmc_rtnl(in_dev, pmc)
1439                 igmp_group_dropped(pmc);
1440
1441 #ifdef CONFIG_IP_MULTICAST
1442         in_dev->mr_ifc_count = 0;
1443         if (del_timer(&in_dev->mr_ifc_timer))
1444                 __in_dev_put(in_dev);
1445         in_dev->mr_gq_running = 0;
1446         if (del_timer(&in_dev->mr_gq_timer))
1447                 __in_dev_put(in_dev);
1448         igmpv3_clear_delrec(in_dev);
1449 #endif
1450
1451         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1452 }
1453
1454 void ip_mc_init_dev(struct in_device *in_dev)
1455 {
1456         ASSERT_RTNL();
1457
1458 #ifdef CONFIG_IP_MULTICAST
1459         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1460                         (unsigned long)in_dev);
1461         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1462                         (unsigned long)in_dev);
1463         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1464 #endif
1465
1466         spin_lock_init(&in_dev->mc_tomb_lock);
1467 }
1468
1469 /* Device going up */
1470
1471 void ip_mc_up(struct in_device *in_dev)
1472 {
1473         struct ip_mc_list *pmc;
1474
1475         ASSERT_RTNL();
1476
1477         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1478
1479         for_each_pmc_rtnl(in_dev, pmc)
1480                 igmp_group_added(pmc);
1481 }
1482
1483 /*
1484  *      Device is about to be destroyed: clean up.
1485  */
1486
1487 void ip_mc_destroy_dev(struct in_device *in_dev)
1488 {
1489         struct ip_mc_list *i;
1490
1491         ASSERT_RTNL();
1492
1493         /* Deactivate timers */
1494         ip_mc_down(in_dev);
1495
1496         while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1497                 in_dev->mc_list = i->next_rcu;
1498                 in_dev->mc_count--;
1499
1500                 /* We've dropped the groups in ip_mc_down already */
1501                 ip_mc_clear_src(i);
1502                 ip_ma_put(i);
1503         }
1504 }
1505
1506 /* RTNL is locked */
1507 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1508 {
1509         struct net_device *dev = NULL;
1510         struct in_device *idev = NULL;
1511
1512         if (imr->imr_ifindex) {
1513                 idev = inetdev_by_index(net, imr->imr_ifindex);
1514                 return idev;
1515         }
1516         if (imr->imr_address.s_addr) {
1517                 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1518                 if (!dev)
1519                         return NULL;
1520         }
1521
1522         if (!dev) {
1523                 struct rtable *rt = ip_route_output(net,
1524                                                     imr->imr_multiaddr.s_addr,
1525                                                     0, 0, 0);
1526                 if (!IS_ERR(rt)) {
1527                         dev = rt->dst.dev;
1528                         ip_rt_put(rt);
1529                 }
1530         }
1531         if (dev) {
1532                 imr->imr_ifindex = dev->ifindex;
1533                 idev = __in_dev_get_rtnl(dev);
1534         }
1535         return idev;
1536 }
1537
1538 /*
1539  *      Join a socket to a group
1540  */
1541 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1542 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1543
1544
1545 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1546         __be32 *psfsrc)
1547 {
1548         struct ip_sf_list *psf, *psf_prev;
1549         int rv = 0;
1550
1551         psf_prev = NULL;
1552         for (psf = pmc->sources; psf; psf = psf->sf_next) {
1553                 if (psf->sf_inaddr == *psfsrc)
1554                         break;
1555                 psf_prev = psf;
1556         }
1557         if (!psf || psf->sf_count[sfmode] == 0) {
1558                 /* source filter not found, or count wrong =>  bug */
1559                 return -ESRCH;
1560         }
1561         psf->sf_count[sfmode]--;
1562         if (psf->sf_count[sfmode] == 0) {
1563                 ip_rt_multicast_event(pmc->interface);
1564         }
1565         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1566 #ifdef CONFIG_IP_MULTICAST
1567                 struct in_device *in_dev = pmc->interface;
1568 #endif
1569
1570                 /* no more filters for this source */
1571                 if (psf_prev)
1572                         psf_prev->sf_next = psf->sf_next;
1573                 else
1574                         pmc->sources = psf->sf_next;
1575 #ifdef CONFIG_IP_MULTICAST
1576                 if (psf->sf_oldin &&
1577                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1578                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1579                                 IGMP_Unsolicited_Report_Count;
1580                         psf->sf_next = pmc->tomb;
1581                         pmc->tomb = psf;
1582                         rv = 1;
1583                 } else
1584 #endif
1585                         kfree(psf);
1586         }
1587         return rv;
1588 }
1589
1590 #ifndef CONFIG_IP_MULTICAST
1591 #define igmp_ifc_event(x)       do { } while (0)
1592 #endif
1593
1594 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1595                          int sfcount, __be32 *psfsrc, int delta)
1596 {
1597         struct ip_mc_list *pmc;
1598         int     changerec = 0;
1599         int     i, err;
1600
1601         if (!in_dev)
1602                 return -ENODEV;
1603         rcu_read_lock();
1604         for_each_pmc_rcu(in_dev, pmc) {
1605                 if (*pmca == pmc->multiaddr)
1606                         break;
1607         }
1608         if (!pmc) {
1609                 /* MCA not found?? bug */
1610                 rcu_read_unlock();
1611                 return -ESRCH;
1612         }
1613         spin_lock_bh(&pmc->lock);
1614         rcu_read_unlock();
1615 #ifdef CONFIG_IP_MULTICAST
1616         sf_markstate(pmc);
1617 #endif
1618         if (!delta) {
1619                 err = -EINVAL;
1620                 if (!pmc->sfcount[sfmode])
1621                         goto out_unlock;
1622                 pmc->sfcount[sfmode]--;
1623         }
1624         err = 0;
1625         for (i = 0; i < sfcount; i++) {
1626                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1627
1628                 changerec |= rv > 0;
1629                 if (!err && rv < 0)
1630                         err = rv;
1631         }
1632         if (pmc->sfmode == MCAST_EXCLUDE &&
1633             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1634             pmc->sfcount[MCAST_INCLUDE]) {
1635 #ifdef CONFIG_IP_MULTICAST
1636                 struct ip_sf_list *psf;
1637 #endif
1638
1639                 /* filter mode change */
1640                 pmc->sfmode = MCAST_INCLUDE;
1641 #ifdef CONFIG_IP_MULTICAST
1642                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1643                         IGMP_Unsolicited_Report_Count;
1644                 in_dev->mr_ifc_count = pmc->crcount;
1645                 for (psf = pmc->sources; psf; psf = psf->sf_next)
1646                         psf->sf_crcount = 0;
1647                 igmp_ifc_event(pmc->interface);
1648         } else if (sf_setstate(pmc) || changerec) {
1649                 igmp_ifc_event(pmc->interface);
1650 #endif
1651         }
1652 out_unlock:
1653         spin_unlock_bh(&pmc->lock);
1654         return err;
1655 }
1656
1657 /*
1658  * Add multicast single-source filter to the interface list
1659  */
1660 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1661         __be32 *psfsrc)
1662 {
1663         struct ip_sf_list *psf, *psf_prev;
1664
1665         psf_prev = NULL;
1666         for (psf = pmc->sources; psf; psf = psf->sf_next) {
1667                 if (psf->sf_inaddr == *psfsrc)
1668                         break;
1669                 psf_prev = psf;
1670         }
1671         if (!psf) {
1672                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1673                 if (!psf)
1674                         return -ENOBUFS;
1675                 psf->sf_inaddr = *psfsrc;
1676                 if (psf_prev) {
1677                         psf_prev->sf_next = psf;
1678                 } else
1679                         pmc->sources = psf;
1680         }
1681         psf->sf_count[sfmode]++;
1682         if (psf->sf_count[sfmode] == 1) {
1683                 ip_rt_multicast_event(pmc->interface);
1684         }
1685         return 0;
1686 }
1687
1688 #ifdef CONFIG_IP_MULTICAST
1689 static void sf_markstate(struct ip_mc_list *pmc)
1690 {
1691         struct ip_sf_list *psf;
1692         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1693
1694         for (psf = pmc->sources; psf; psf = psf->sf_next)
1695                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1696                         psf->sf_oldin = mca_xcount ==
1697                                 psf->sf_count[MCAST_EXCLUDE] &&
1698                                 !psf->sf_count[MCAST_INCLUDE];
1699                 } else
1700                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1701 }
1702
1703 static int sf_setstate(struct ip_mc_list *pmc)
1704 {
1705         struct ip_sf_list *psf, *dpsf;
1706         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1707         int qrv = pmc->interface->mr_qrv;
1708         int new_in, rv;
1709
1710         rv = 0;
1711         for (psf = pmc->sources; psf; psf = psf->sf_next) {
1712                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1713                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1714                                 !psf->sf_count[MCAST_INCLUDE];
1715                 } else
1716                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1717                 if (new_in) {
1718                         if (!psf->sf_oldin) {
1719                                 struct ip_sf_list *prev = NULL;
1720
1721                                 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1722                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1723                                                 break;
1724                                         prev = dpsf;
1725                                 }
1726                                 if (dpsf) {
1727                                         if (prev)
1728                                                 prev->sf_next = dpsf->sf_next;
1729                                         else
1730                                                 pmc->tomb = dpsf->sf_next;
1731                                         kfree(dpsf);
1732                                 }
1733                                 psf->sf_crcount = qrv;
1734                                 rv++;
1735                         }
1736                 } else if (psf->sf_oldin) {
1737
1738                         psf->sf_crcount = 0;
1739                         /*
1740                          * add or update "delete" records if an active filter
1741                          * is now inactive
1742                          */
1743                         for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1744                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1745                                         break;
1746                         if (!dpsf) {
1747                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1748                                 if (!dpsf)
1749                                         continue;
1750                                 *dpsf = *psf;
1751                                 /* pmc->lock held by callers */
1752                                 dpsf->sf_next = pmc->tomb;
1753                                 pmc->tomb = dpsf;
1754                         }
1755                         dpsf->sf_crcount = qrv;
1756                         rv++;
1757                 }
1758         }
1759         return rv;
1760 }
1761 #endif
1762
1763 /*
1764  * Add multicast source filter list to the interface list
1765  */
1766 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1767                          int sfcount, __be32 *psfsrc, int delta)
1768 {
1769         struct ip_mc_list *pmc;
1770         int     isexclude;
1771         int     i, err;
1772
1773         if (!in_dev)
1774                 return -ENODEV;
1775         rcu_read_lock();
1776         for_each_pmc_rcu(in_dev, pmc) {
1777                 if (*pmca == pmc->multiaddr)
1778                         break;
1779         }
1780         if (!pmc) {
1781                 /* MCA not found?? bug */
1782                 rcu_read_unlock();
1783                 return -ESRCH;
1784         }
1785         spin_lock_bh(&pmc->lock);
1786         rcu_read_unlock();
1787
1788 #ifdef CONFIG_IP_MULTICAST
1789         sf_markstate(pmc);
1790 #endif
1791         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1792         if (!delta)
1793                 pmc->sfcount[sfmode]++;
1794         err = 0;
1795         for (i = 0; i < sfcount; i++) {
1796                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1797                 if (err)
1798                         break;
1799         }
1800         if (err) {
1801                 int j;
1802
1803                 if (!delta)
1804                         pmc->sfcount[sfmode]--;
1805                 for (j = 0; j < i; j++)
1806                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1807         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1808 #ifdef CONFIG_IP_MULTICAST
1809                 struct ip_sf_list *psf;
1810                 in_dev = pmc->interface;
1811 #endif
1812
1813                 /* filter mode change */
1814                 if (pmc->sfcount[MCAST_EXCLUDE])
1815                         pmc->sfmode = MCAST_EXCLUDE;
1816                 else if (pmc->sfcount[MCAST_INCLUDE])
1817                         pmc->sfmode = MCAST_INCLUDE;
1818 #ifdef CONFIG_IP_MULTICAST
1819                 /* else no filters; keep old mode for reports */
1820
1821                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1822                         IGMP_Unsolicited_Report_Count;
1823                 in_dev->mr_ifc_count = pmc->crcount;
1824                 for (psf = pmc->sources; psf; psf = psf->sf_next)
1825                         psf->sf_crcount = 0;
1826                 igmp_ifc_event(in_dev);
1827         } else if (sf_setstate(pmc)) {
1828                 igmp_ifc_event(in_dev);
1829 #endif
1830         }
1831         spin_unlock_bh(&pmc->lock);
1832         return err;
1833 }
1834
1835 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1836 {
1837         struct ip_sf_list *psf, *nextpsf;
1838
1839         for (psf = pmc->tomb; psf; psf = nextpsf) {
1840                 nextpsf = psf->sf_next;
1841                 kfree(psf);
1842         }
1843         pmc->tomb = NULL;
1844         for (psf = pmc->sources; psf; psf = nextpsf) {
1845                 nextpsf = psf->sf_next;
1846                 kfree(psf);
1847         }
1848         pmc->sources = NULL;
1849         pmc->sfmode = MCAST_EXCLUDE;
1850         pmc->sfcount[MCAST_INCLUDE] = 0;
1851         pmc->sfcount[MCAST_EXCLUDE] = 1;
1852 }
1853
1854
1855 /*
1856  * Join a multicast group
1857  */
1858 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1859 {
1860         int err;
1861         __be32 addr = imr->imr_multiaddr.s_addr;
1862         struct ip_mc_socklist *iml = NULL, *i;
1863         struct in_device *in_dev;
1864         struct inet_sock *inet = inet_sk(sk);
1865         struct net *net = sock_net(sk);
1866         int ifindex;
1867         int count = 0;
1868
1869         if (!ipv4_is_multicast(addr))
1870                 return -EINVAL;
1871
1872         rtnl_lock();
1873
1874         in_dev = ip_mc_find_dev(net, imr);
1875
1876         if (!in_dev) {
1877                 iml = NULL;
1878                 err = -ENODEV;
1879                 goto done;
1880         }
1881
1882         err = -EADDRINUSE;
1883         ifindex = imr->imr_ifindex;
1884         for_each_pmc_rtnl(inet, i) {
1885                 if (i->multi.imr_multiaddr.s_addr == addr &&
1886                     i->multi.imr_ifindex == ifindex)
1887                         goto done;
1888                 count++;
1889         }
1890         err = -ENOBUFS;
1891         if (count >= sysctl_igmp_max_memberships)
1892                 goto done;
1893         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1894         if (iml == NULL)
1895                 goto done;
1896
1897         memcpy(&iml->multi, imr, sizeof(*imr));
1898         iml->next_rcu = inet->mc_list;
1899         iml->sflist = NULL;
1900         iml->sfmode = MCAST_EXCLUDE;
1901         rcu_assign_pointer(inet->mc_list, iml);
1902         ip_mc_inc_group(in_dev, addr);
1903         err = 0;
1904 done:
1905         rtnl_unlock();
1906         return err;
1907 }
1908 EXPORT_SYMBOL(ip_mc_join_group);
1909
1910 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1911                            struct in_device *in_dev)
1912 {
1913         struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1914         int err;
1915
1916         if (psf == NULL) {
1917                 /* any-source empty exclude case */
1918                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1919                         iml->sfmode, 0, NULL, 0);
1920         }
1921         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1922                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1923         RCU_INIT_POINTER(iml->sflist, NULL);
1924         /* decrease mem now to avoid the memleak warning */
1925         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1926         kfree_rcu(psf, rcu);
1927         return err;
1928 }
1929
1930 /*
1931  *      Ask a socket to leave a group.
1932  */
1933
1934 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1935 {
1936         struct inet_sock *inet = inet_sk(sk);
1937         struct ip_mc_socklist *iml;
1938         struct ip_mc_socklist __rcu **imlp;
1939         struct in_device *in_dev;
1940         struct net *net = sock_net(sk);
1941         __be32 group = imr->imr_multiaddr.s_addr;
1942         u32 ifindex;
1943         int ret = -EADDRNOTAVAIL;
1944
1945         rtnl_lock();
1946         in_dev = ip_mc_find_dev(net, imr);
1947         if (!in_dev) {
1948                 ret = -ENODEV;
1949                 goto out;
1950         }
1951         ifindex = imr->imr_ifindex;
1952         for (imlp = &inet->mc_list;
1953              (iml = rtnl_dereference(*imlp)) != NULL;
1954              imlp = &iml->next_rcu) {
1955                 if (iml->multi.imr_multiaddr.s_addr != group)
1956                         continue;
1957                 if (ifindex) {
1958                         if (iml->multi.imr_ifindex != ifindex)
1959                                 continue;
1960                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1961                                 iml->multi.imr_address.s_addr)
1962                         continue;
1963
1964                 (void) ip_mc_leave_src(sk, iml, in_dev);
1965
1966                 *imlp = iml->next_rcu;
1967
1968                 ip_mc_dec_group(in_dev, group);
1969                 rtnl_unlock();
1970                 /* decrease mem now to avoid the memleak warning */
1971                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1972                 kfree_rcu(iml, rcu);
1973                 return 0;
1974         }
1975 out:
1976         rtnl_unlock();
1977         return ret;
1978 }
1979 EXPORT_SYMBOL(ip_mc_leave_group);
1980
1981 int ip_mc_source(int add, int omode, struct sock *sk, struct
1982         ip_mreq_source *mreqs, int ifindex)
1983 {
1984         int err;
1985         struct ip_mreqn imr;
1986         __be32 addr = mreqs->imr_multiaddr;
1987         struct ip_mc_socklist *pmc;
1988         struct in_device *in_dev = NULL;
1989         struct inet_sock *inet = inet_sk(sk);
1990         struct ip_sf_socklist *psl;
1991         struct net *net = sock_net(sk);
1992         int leavegroup = 0;
1993         int i, j, rv;
1994
1995         if (!ipv4_is_multicast(addr))
1996                 return -EINVAL;
1997
1998         rtnl_lock();
1999
2000         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2001         imr.imr_address.s_addr = mreqs->imr_interface;
2002         imr.imr_ifindex = ifindex;
2003         in_dev = ip_mc_find_dev(net, &imr);
2004
2005         if (!in_dev) {
2006                 err = -ENODEV;
2007                 goto done;
2008         }
2009         err = -EADDRNOTAVAIL;
2010
2011         for_each_pmc_rtnl(inet, pmc) {
2012                 if ((pmc->multi.imr_multiaddr.s_addr ==
2013                      imr.imr_multiaddr.s_addr) &&
2014                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
2015                         break;
2016         }
2017         if (!pmc) {             /* must have a prior join */
2018                 err = -EINVAL;
2019                 goto done;
2020         }
2021         /* if a source filter was set, must be the same mode as before */
2022         if (pmc->sflist) {
2023                 if (pmc->sfmode != omode) {
2024                         err = -EINVAL;
2025                         goto done;
2026                 }
2027         } else if (pmc->sfmode != omode) {
2028                 /* allow mode switches for empty-set filters */
2029                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2030                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2031                         NULL, 0);
2032                 pmc->sfmode = omode;
2033         }
2034
2035         psl = rtnl_dereference(pmc->sflist);
2036         if (!add) {
2037                 if (!psl)
2038                         goto done;      /* err = -EADDRNOTAVAIL */
2039                 rv = !0;
2040                 for (i = 0; i < psl->sl_count; i++) {
2041                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2042                                 sizeof(__be32));
2043                         if (rv == 0)
2044                                 break;
2045                 }
2046                 if (rv)         /* source not found */
2047                         goto done;      /* err = -EADDRNOTAVAIL */
2048
2049                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2050                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2051                         leavegroup = 1;
2052                         goto done;
2053                 }
2054
2055                 /* update the interface filter */
2056                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2057                         &mreqs->imr_sourceaddr, 1);
2058
2059                 for (j = i+1; j < psl->sl_count; j++)
2060                         psl->sl_addr[j-1] = psl->sl_addr[j];
2061                 psl->sl_count--;
2062                 err = 0;
2063                 goto done;
2064         }
2065         /* else, add a new source to the filter */
2066
2067         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2068                 err = -ENOBUFS;
2069                 goto done;
2070         }
2071         if (!psl || psl->sl_count == psl->sl_max) {
2072                 struct ip_sf_socklist *newpsl;
2073                 int count = IP_SFBLOCK;
2074
2075                 if (psl)
2076                         count += psl->sl_max;
2077                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2078                 if (!newpsl) {
2079                         err = -ENOBUFS;
2080                         goto done;
2081                 }
2082                 newpsl->sl_max = count;
2083                 newpsl->sl_count = count - IP_SFBLOCK;
2084                 if (psl) {
2085                         for (i = 0; i < psl->sl_count; i++)
2086                                 newpsl->sl_addr[i] = psl->sl_addr[i];
2087                         /* decrease mem now to avoid the memleak warning */
2088                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2089                         kfree_rcu(psl, rcu);
2090                 }
2091                 rcu_assign_pointer(pmc->sflist, newpsl);
2092                 psl = newpsl;
2093         }
2094         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2095         for (i = 0; i < psl->sl_count; i++) {
2096                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2097                         sizeof(__be32));
2098                 if (rv == 0)
2099                         break;
2100         }
2101         if (rv == 0)            /* address already there is an error */
2102                 goto done;
2103         for (j = psl->sl_count-1; j >= i; j--)
2104                 psl->sl_addr[j+1] = psl->sl_addr[j];
2105         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2106         psl->sl_count++;
2107         err = 0;
2108         /* update the interface list */
2109         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2110                 &mreqs->imr_sourceaddr, 1);
2111 done:
2112         rtnl_unlock();
2113         if (leavegroup)
2114                 return ip_mc_leave_group(sk, &imr);
2115         return err;
2116 }
2117
2118 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2119 {
2120         int err = 0;
2121         struct ip_mreqn imr;
2122         __be32 addr = msf->imsf_multiaddr;
2123         struct ip_mc_socklist *pmc;
2124         struct in_device *in_dev;
2125         struct inet_sock *inet = inet_sk(sk);
2126         struct ip_sf_socklist *newpsl, *psl;
2127         struct net *net = sock_net(sk);
2128         int leavegroup = 0;
2129
2130         if (!ipv4_is_multicast(addr))
2131                 return -EINVAL;
2132         if (msf->imsf_fmode != MCAST_INCLUDE &&
2133             msf->imsf_fmode != MCAST_EXCLUDE)
2134                 return -EINVAL;
2135
2136         rtnl_lock();
2137
2138         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2139         imr.imr_address.s_addr = msf->imsf_interface;
2140         imr.imr_ifindex = ifindex;
2141         in_dev = ip_mc_find_dev(net, &imr);
2142
2143         if (!in_dev) {
2144                 err = -ENODEV;
2145                 goto done;
2146         }
2147
2148         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2149         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2150                 leavegroup = 1;
2151                 goto done;
2152         }
2153
2154         for_each_pmc_rtnl(inet, pmc) {
2155                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2156                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2157                         break;
2158         }
2159         if (!pmc) {             /* must have a prior join */
2160                 err = -EINVAL;
2161                 goto done;
2162         }
2163         if (msf->imsf_numsrc) {
2164                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2165                                                            GFP_KERNEL);
2166                 if (!newpsl) {
2167                         err = -ENOBUFS;
2168                         goto done;
2169                 }
2170                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2171                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2172                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2173                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2174                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2175                 if (err) {
2176                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2177                         goto done;
2178                 }
2179         } else {
2180                 newpsl = NULL;
2181                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2182                                      msf->imsf_fmode, 0, NULL, 0);
2183         }
2184         psl = rtnl_dereference(pmc->sflist);
2185         if (psl) {
2186                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2187                         psl->sl_count, psl->sl_addr, 0);
2188                 /* decrease mem now to avoid the memleak warning */
2189                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2190                 kfree_rcu(psl, rcu);
2191         } else
2192                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2193                         0, NULL, 0);
2194         rcu_assign_pointer(pmc->sflist, newpsl);
2195         pmc->sfmode = msf->imsf_fmode;
2196         err = 0;
2197 done:
2198         rtnl_unlock();
2199         if (leavegroup)
2200                 err = ip_mc_leave_group(sk, &imr);
2201         return err;
2202 }
2203
2204 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2205         struct ip_msfilter __user *optval, int __user *optlen)
2206 {
2207         int err, len, count, copycount;
2208         struct ip_mreqn imr;
2209         __be32 addr = msf->imsf_multiaddr;
2210         struct ip_mc_socklist *pmc;
2211         struct in_device *in_dev;
2212         struct inet_sock *inet = inet_sk(sk);
2213         struct ip_sf_socklist *psl;
2214         struct net *net = sock_net(sk);
2215
2216         if (!ipv4_is_multicast(addr))
2217                 return -EINVAL;
2218
2219         rtnl_lock();
2220
2221         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2222         imr.imr_address.s_addr = msf->imsf_interface;
2223         imr.imr_ifindex = 0;
2224         in_dev = ip_mc_find_dev(net, &imr);
2225
2226         if (!in_dev) {
2227                 err = -ENODEV;
2228                 goto done;
2229         }
2230         err = -EADDRNOTAVAIL;
2231
2232         for_each_pmc_rtnl(inet, pmc) {
2233                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2234                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2235                         break;
2236         }
2237         if (!pmc)               /* must have a prior join */
2238                 goto done;
2239         msf->imsf_fmode = pmc->sfmode;
2240         psl = rtnl_dereference(pmc->sflist);
2241         rtnl_unlock();
2242         if (!psl) {
2243                 len = 0;
2244                 count = 0;
2245         } else {
2246                 count = psl->sl_count;
2247         }
2248         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2249         len = copycount * sizeof(psl->sl_addr[0]);
2250         msf->imsf_numsrc = count;
2251         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2252             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2253                 return -EFAULT;
2254         }
2255         if (len &&
2256             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2257                 return -EFAULT;
2258         return 0;
2259 done:
2260         rtnl_unlock();
2261         return err;
2262 }
2263
2264 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2265         struct group_filter __user *optval, int __user *optlen)
2266 {
2267         int err, i, count, copycount;
2268         struct sockaddr_in *psin;
2269         __be32 addr;
2270         struct ip_mc_socklist *pmc;
2271         struct inet_sock *inet = inet_sk(sk);
2272         struct ip_sf_socklist *psl;
2273
2274         psin = (struct sockaddr_in *)&gsf->gf_group;
2275         if (psin->sin_family != AF_INET)
2276                 return -EINVAL;
2277         addr = psin->sin_addr.s_addr;
2278         if (!ipv4_is_multicast(addr))
2279                 return -EINVAL;
2280
2281         rtnl_lock();
2282
2283         err = -EADDRNOTAVAIL;
2284
2285         for_each_pmc_rtnl(inet, pmc) {
2286                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2287                     pmc->multi.imr_ifindex == gsf->gf_interface)
2288                         break;
2289         }
2290         if (!pmc)               /* must have a prior join */
2291                 goto done;
2292         gsf->gf_fmode = pmc->sfmode;
2293         psl = rtnl_dereference(pmc->sflist);
2294         rtnl_unlock();
2295         count = psl ? psl->sl_count : 0;
2296         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2297         gsf->gf_numsrc = count;
2298         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2299             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2300                 return -EFAULT;
2301         }
2302         for (i = 0; i < copycount; i++) {
2303                 struct sockaddr_storage ss;
2304
2305                 psin = (struct sockaddr_in *)&ss;
2306                 memset(&ss, 0, sizeof(ss));
2307                 psin->sin_family = AF_INET;
2308                 psin->sin_addr.s_addr = psl->sl_addr[i];
2309                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2310                         return -EFAULT;
2311         }
2312         return 0;
2313 done:
2314         rtnl_unlock();
2315         return err;
2316 }
2317
2318 /*
2319  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2320  */
2321 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2322 {
2323         struct inet_sock *inet = inet_sk(sk);
2324         struct ip_mc_socklist *pmc;
2325         struct ip_sf_socklist *psl;
2326         int i;
2327         int ret;
2328
2329         ret = 1;
2330         if (!ipv4_is_multicast(loc_addr))
2331                 goto out;
2332
2333         rcu_read_lock();
2334         for_each_pmc_rcu(inet, pmc) {
2335                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2336                     pmc->multi.imr_ifindex == dif)
2337                         break;
2338         }
2339         ret = inet->mc_all;
2340         if (!pmc)
2341                 goto unlock;
2342         psl = rcu_dereference(pmc->sflist);
2343         ret = (pmc->sfmode == MCAST_EXCLUDE);
2344         if (!psl)
2345                 goto unlock;
2346
2347         for (i = 0; i < psl->sl_count; i++) {
2348                 if (psl->sl_addr[i] == rmt_addr)
2349                         break;
2350         }
2351         ret = 0;
2352         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2353                 goto unlock;
2354         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2355                 goto unlock;
2356         ret = 1;
2357 unlock:
2358         rcu_read_unlock();
2359 out:
2360         return ret;
2361 }
2362
2363 /*
2364  *      A socket is closing.
2365  */
2366
2367 void ip_mc_drop_socket(struct sock *sk)
2368 {
2369         struct inet_sock *inet = inet_sk(sk);
2370         struct ip_mc_socklist *iml;
2371         struct net *net = sock_net(sk);
2372
2373         if (inet->mc_list == NULL)
2374                 return;
2375
2376         rtnl_lock();
2377         while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2378                 struct in_device *in_dev;
2379
2380                 inet->mc_list = iml->next_rcu;
2381                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2382                 (void) ip_mc_leave_src(sk, iml, in_dev);
2383                 if (in_dev != NULL)
2384                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2385                 /* decrease mem now to avoid the memleak warning */
2386                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2387                 kfree_rcu(iml, rcu);
2388         }
2389         rtnl_unlock();
2390 }
2391
2392 /* called with rcu_read_lock() */
2393 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2394 {
2395         struct ip_mc_list *im;
2396         struct ip_mc_list __rcu **mc_hash;
2397         struct ip_sf_list *psf;
2398         int rv = 0;
2399
2400         mc_hash = rcu_dereference(in_dev->mc_hash);
2401         if (mc_hash) {
2402                 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2403
2404                 for (im = rcu_dereference(mc_hash[hash]);
2405                      im != NULL;
2406                      im = rcu_dereference(im->next_hash)) {
2407                         if (im->multiaddr == mc_addr)
2408                                 break;
2409                 }
2410         } else {
2411                 for_each_pmc_rcu(in_dev, im) {
2412                         if (im->multiaddr == mc_addr)
2413                                 break;
2414                 }
2415         }
2416         if (im && proto == IPPROTO_IGMP) {
2417                 rv = 1;
2418         } else if (im) {
2419                 if (src_addr) {
2420                         for (psf = im->sources; psf; psf = psf->sf_next) {
2421                                 if (psf->sf_inaddr == src_addr)
2422                                         break;
2423                         }
2424                         if (psf)
2425                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2426                                         psf->sf_count[MCAST_EXCLUDE] !=
2427                                         im->sfcount[MCAST_EXCLUDE];
2428                         else
2429                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2430                 } else
2431                         rv = 1; /* unspecified source; tentatively allow */
2432         }
2433         return rv;
2434 }
2435
2436 #if defined(CONFIG_PROC_FS)
2437 struct igmp_mc_iter_state {
2438         struct seq_net_private p;
2439         struct net_device *dev;
2440         struct in_device *in_dev;
2441 };
2442
2443 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2444
2445 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2446 {
2447         struct net *net = seq_file_net(seq);
2448         struct ip_mc_list *im = NULL;
2449         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2450
2451         state->in_dev = NULL;
2452         for_each_netdev_rcu(net, state->dev) {
2453                 struct in_device *in_dev;
2454
2455                 in_dev = __in_dev_get_rcu(state->dev);
2456                 if (!in_dev)
2457                         continue;
2458                 im = rcu_dereference(in_dev->mc_list);
2459                 if (im) {
2460                         state->in_dev = in_dev;
2461                         break;
2462                 }
2463         }
2464         return im;
2465 }
2466
2467 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2468 {
2469         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2470
2471         im = rcu_dereference(im->next_rcu);
2472         while (!im) {
2473                 state->dev = next_net_device_rcu(state->dev);
2474                 if (!state->dev) {
2475                         state->in_dev = NULL;
2476                         break;
2477                 }
2478                 state->in_dev = __in_dev_get_rcu(state->dev);
2479                 if (!state->in_dev)
2480                         continue;
2481                 im = rcu_dereference(state->in_dev->mc_list);
2482         }
2483         return im;
2484 }
2485
2486 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2487 {
2488         struct ip_mc_list *im = igmp_mc_get_first(seq);
2489         if (im)
2490                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2491                         --pos;
2492         return pos ? NULL : im;
2493 }
2494
2495 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2496         __acquires(rcu)
2497 {
2498         rcu_read_lock();
2499         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2500 }
2501
2502 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2503 {
2504         struct ip_mc_list *im;
2505         if (v == SEQ_START_TOKEN)
2506                 im = igmp_mc_get_first(seq);
2507         else
2508                 im = igmp_mc_get_next(seq, v);
2509         ++*pos;
2510         return im;
2511 }
2512
2513 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2514         __releases(rcu)
2515 {
2516         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2517
2518         state->in_dev = NULL;
2519         state->dev = NULL;
2520         rcu_read_unlock();
2521 }
2522
2523 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2524 {
2525         if (v == SEQ_START_TOKEN)
2526                 seq_puts(seq,
2527                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2528         else {
2529                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2530                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2531                 char   *querier;
2532                 long delta;
2533
2534 #ifdef CONFIG_IP_MULTICAST
2535                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2536                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2537                           "V3";
2538 #else
2539                 querier = "NONE";
2540 #endif
2541
2542                 if (rcu_dereference(state->in_dev->mc_list) == im) {
2543                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2544                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2545                 }
2546
2547                 delta = im->timer.expires - jiffies;
2548                 seq_printf(seq,
2549                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2550                            im->multiaddr, im->users,
2551                            im->tm_running,
2552                            im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2553                            im->reporter);
2554         }
2555         return 0;
2556 }
2557
2558 static const struct seq_operations igmp_mc_seq_ops = {
2559         .start  =       igmp_mc_seq_start,
2560         .next   =       igmp_mc_seq_next,
2561         .stop   =       igmp_mc_seq_stop,
2562         .show   =       igmp_mc_seq_show,
2563 };
2564
2565 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2566 {
2567         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2568                         sizeof(struct igmp_mc_iter_state));
2569 }
2570
2571 static const struct file_operations igmp_mc_seq_fops = {
2572         .owner          =       THIS_MODULE,
2573         .open           =       igmp_mc_seq_open,
2574         .read           =       seq_read,
2575         .llseek         =       seq_lseek,
2576         .release        =       seq_release_net,
2577 };
2578
2579 struct igmp_mcf_iter_state {
2580         struct seq_net_private p;
2581         struct net_device *dev;
2582         struct in_device *idev;
2583         struct ip_mc_list *im;
2584 };
2585
2586 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2587
2588 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2589 {
2590         struct net *net = seq_file_net(seq);
2591         struct ip_sf_list *psf = NULL;
2592         struct ip_mc_list *im = NULL;
2593         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2594
2595         state->idev = NULL;
2596         state->im = NULL;
2597         for_each_netdev_rcu(net, state->dev) {
2598                 struct in_device *idev;
2599                 idev = __in_dev_get_rcu(state->dev);
2600                 if (unlikely(idev == NULL))
2601                         continue;
2602                 im = rcu_dereference(idev->mc_list);
2603                 if (likely(im != NULL)) {
2604                         spin_lock_bh(&im->lock);
2605                         psf = im->sources;
2606                         if (likely(psf != NULL)) {
2607                                 state->im = im;
2608                                 state->idev = idev;
2609                                 break;
2610                         }
2611                         spin_unlock_bh(&im->lock);
2612                 }
2613         }
2614         return psf;
2615 }
2616
2617 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2618 {
2619         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2620
2621         psf = psf->sf_next;
2622         while (!psf) {
2623                 spin_unlock_bh(&state->im->lock);
2624                 state->im = state->im->next;
2625                 while (!state->im) {
2626                         state->dev = next_net_device_rcu(state->dev);
2627                         if (!state->dev) {
2628                                 state->idev = NULL;
2629                                 goto out;
2630                         }
2631                         state->idev = __in_dev_get_rcu(state->dev);
2632                         if (!state->idev)
2633                                 continue;
2634                         state->im = rcu_dereference(state->idev->mc_list);
2635                 }
2636                 if (!state->im)
2637                         break;
2638                 spin_lock_bh(&state->im->lock);
2639                 psf = state->im->sources;
2640         }
2641 out:
2642         return psf;
2643 }
2644
2645 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2646 {
2647         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2648         if (psf)
2649                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2650                         --pos;
2651         return pos ? NULL : psf;
2652 }
2653
2654 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2655         __acquires(rcu)
2656 {
2657         rcu_read_lock();
2658         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2659 }
2660
2661 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2662 {
2663         struct ip_sf_list *psf;
2664         if (v == SEQ_START_TOKEN)
2665                 psf = igmp_mcf_get_first(seq);
2666         else
2667                 psf = igmp_mcf_get_next(seq, v);
2668         ++*pos;
2669         return psf;
2670 }
2671
2672 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2673         __releases(rcu)
2674 {
2675         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2676         if (likely(state->im != NULL)) {
2677                 spin_unlock_bh(&state->im->lock);
2678                 state->im = NULL;
2679         }
2680         state->idev = NULL;
2681         state->dev = NULL;
2682         rcu_read_unlock();
2683 }
2684
2685 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2686 {
2687         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2688         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2689
2690         if (v == SEQ_START_TOKEN) {
2691                 seq_printf(seq,
2692                            "%3s %6s "
2693                            "%10s %10s %6s %6s\n", "Idx",
2694                            "Device", "MCA",
2695                            "SRC", "INC", "EXC");
2696         } else {
2697                 seq_printf(seq,
2698                            "%3d %6.6s 0x%08x "
2699                            "0x%08x %6lu %6lu\n",
2700                            state->dev->ifindex, state->dev->name,
2701                            ntohl(state->im->multiaddr),
2702                            ntohl(psf->sf_inaddr),
2703                            psf->sf_count[MCAST_INCLUDE],
2704                            psf->sf_count[MCAST_EXCLUDE]);
2705         }
2706         return 0;
2707 }
2708
2709 static const struct seq_operations igmp_mcf_seq_ops = {
2710         .start  =       igmp_mcf_seq_start,
2711         .next   =       igmp_mcf_seq_next,
2712         .stop   =       igmp_mcf_seq_stop,
2713         .show   =       igmp_mcf_seq_show,
2714 };
2715
2716 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2717 {
2718         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2719                         sizeof(struct igmp_mcf_iter_state));
2720 }
2721
2722 static const struct file_operations igmp_mcf_seq_fops = {
2723         .owner          =       THIS_MODULE,
2724         .open           =       igmp_mcf_seq_open,
2725         .read           =       seq_read,
2726         .llseek         =       seq_lseek,
2727         .release        =       seq_release_net,
2728 };
2729
2730 static int __net_init igmp_net_init(struct net *net)
2731 {
2732         struct proc_dir_entry *pde;
2733
2734         pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2735         if (!pde)
2736                 goto out_igmp;
2737         pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2738                           &igmp_mcf_seq_fops);
2739         if (!pde)
2740                 goto out_mcfilter;
2741         return 0;
2742
2743 out_mcfilter:
2744         remove_proc_entry("igmp", net->proc_net);
2745 out_igmp:
2746         return -ENOMEM;
2747 }
2748
2749 static void __net_exit igmp_net_exit(struct net *net)
2750 {
2751         remove_proc_entry("mcfilter", net->proc_net);
2752         remove_proc_entry("igmp", net->proc_net);
2753 }
2754
2755 static struct pernet_operations igmp_net_ops = {
2756         .init = igmp_net_init,
2757         .exit = igmp_net_exit,
2758 };
2759 #endif
2760
2761 static int igmp_netdev_event(struct notifier_block *this,
2762                              unsigned long event, void *ptr)
2763 {
2764         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2765         struct in_device *in_dev;
2766
2767         switch (event) {
2768         case NETDEV_RESEND_IGMP:
2769                 in_dev = __in_dev_get_rtnl(dev);
2770                 if (in_dev)
2771                         ip_mc_rejoin_groups(in_dev);
2772                 break;
2773         default:
2774                 break;
2775         }
2776         return NOTIFY_DONE;
2777 }
2778
2779 static struct notifier_block igmp_notifier = {
2780         .notifier_call = igmp_netdev_event,
2781 };
2782
2783 int __init igmp_mc_init(void)
2784 {
2785 #if defined(CONFIG_PROC_FS)
2786         int err;
2787
2788         err = register_pernet_subsys(&igmp_net_ops);
2789         if (err)
2790                 return err;
2791         err = register_netdevice_notifier(&igmp_notifier);
2792         if (err)
2793                 goto reg_notif_fail;
2794         return 0;
2795
2796 reg_notif_fail:
2797         unregister_pernet_subsys(&igmp_net_ops);
2798         return err;
2799 #else
2800         return register_netdevice_notifier(&igmp_notifier);
2801 #endif
2802 }