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_Query_Robustness_Variable          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 ?: sysctl_igmp_qrv;
 760         igmp_ifc_start_timer(in_dev, 1);
 761 }
 762
 763
 764 static void igmp_timer_expire(unsigned long data)
 765 {
 766         struct ip_mc_list *im = (struct ip_mc_list *)data;
 767         struct in_device *in_dev = im->interface;
 768
 769         spin_lock(&im->lock);
 770         im->tm_running = 0;
 771
 772         if (im->unsolicit_count) {
 773                 im->unsolicit_count--;
 774                 igmp_start_timer(im, unsolicited_report_interval(in_dev));
 775         }
 776         im->reporter = 1;
 777         spin_unlock(&im->lock);
 778
 779         if (IGMP_V1_SEEN(in_dev))
 780                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 781         else if (IGMP_V2_SEEN(in_dev))
 782                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 783         else
 784                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 785
 786         ip_ma_put(im);
 787 }
 788
 789 /* mark EXCLUDE-mode sources */
 790 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 791 {
 792         struct ip_sf_list *psf;
 793         int i, scount;
 794
 795         scount = 0;
 796         for (psf = pmc->sources; psf; psf = psf->sf_next) {
 797                 if (scount == nsrcs)
 798                         break;
 799                 for (i = 0; i < nsrcs; i++) {
 800                         /* skip inactive filters */
 801                         if (psf->sf_count[MCAST_INCLUDE] ||
 802                             pmc->sfcount[MCAST_EXCLUDE] !=
 803                             psf->sf_count[MCAST_EXCLUDE])
 804                                 break;
 805                         if (srcs[i] == psf->sf_inaddr) {
 806                                 scount++;
 807                                 break;
 808                         }
 809                 }
 810         }
 811         pmc->gsquery = 0;
 812         if (scount == nsrcs)    /* all sources excluded */
 813                 return 0;
 814         return 1;
 815 }
 816
 817 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 818 {
 819         struct ip_sf_list *psf;
 820         int i, scount;
 821
 822         if (pmc->sfmode == MCAST_EXCLUDE)
 823                 return igmp_xmarksources(pmc, nsrcs, srcs);
 824
 825         /* mark INCLUDE-mode sources */
 826         scount = 0;
 827         for (psf = pmc->sources; psf; psf = psf->sf_next) {
 828                 if (scount == nsrcs)
 829                         break;
 830                 for (i = 0; i < nsrcs; i++)
 831                         if (srcs[i] == psf->sf_inaddr) {
 832                                 psf->sf_gsresp = 1;
 833                                 scount++;
 834                                 break;
 835                         }
 836         }
 837         if (!scount) {
 838                 pmc->gsquery = 0;
 839                 return 0;
 840         }
 841         pmc->gsquery = 1;
 842         return 1;
 843 }
 844
 845 /* return true if packet was dropped */
 846 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
 847 {
 848         struct ip_mc_list *im;
 849
 850         /* Timers are only set for non-local groups */
 851
 852         if (group == IGMP_ALL_HOSTS)
 853                 return false;
 854
 855         rcu_read_lock();
 856         for_each_pmc_rcu(in_dev, im) {
 857                 if (im->multiaddr == group) {
 858                         igmp_stop_timer(im);
 859                         break;
 860                 }
 861         }
 862         rcu_read_unlock();
 863         return false;
 864 }
 865
 866 /* return true if packet was dropped */
 867 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 868         int len)
 869 {
 870         struct igmphdr          *ih = igmp_hdr(skb);
 871         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 872         struct ip_mc_list       *im;
 873         __be32                  group = ih->group;
 874         int                     max_delay;
 875         int                     mark = 0;
 876
 877
 878         if (len == 8) {
 879                 if (ih->code == 0) {
 880                         /* Alas, old v1 router presents here. */
 881
 882                         max_delay = IGMP_Query_Response_Interval;
 883                         in_dev->mr_v1_seen = jiffies +
 884                                 IGMP_V1_Router_Present_Timeout;
 885                         group = 0;
 886                 } else {
 887                         /* v2 router present */
 888                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 889                         in_dev->mr_v2_seen = jiffies +
 890                                 IGMP_V2_Router_Present_Timeout;
 891                 }
 892                 /* cancel the interface change timer */
 893                 in_dev->mr_ifc_count = 0;
 894                 if (del_timer(&in_dev->mr_ifc_timer))
 895                         __in_dev_put(in_dev);
 896                 /* clear deleted report items */
 897                 igmpv3_clear_delrec(in_dev);
 898         } else if (len < 12) {
 899                 return true;    /* ignore bogus packet; freed by caller */
 900         } else if (IGMP_V1_SEEN(in_dev)) {
 901                 /* This is a v3 query with v1 queriers present */
 902                 max_delay = IGMP_Query_Response_Interval;
 903                 group = 0;
 904         } else if (IGMP_V2_SEEN(in_dev)) {
 905                 /* this is a v3 query with v2 queriers present;
 906                  * Interpretation of the max_delay code is problematic here.
 907                  * A real v2 host would use ih_code directly, while v3 has a
 908                  * different encoding. We use the v3 encoding as more likely
 909                  * to be intended in a v3 query.
 910                  */
 911                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 912                 if (!max_delay)
 913                         max_delay = 1;  /* can't mod w/ 0 */
 914         } else { /* v3 */
 915                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 916                         return true;
 917
 918                 ih3 = igmpv3_query_hdr(skb);
 919                 if (ih3->nsrcs) {
 920                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 921                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 922                                 return true;
 923                         ih3 = igmpv3_query_hdr(skb);
 924                 }
 925
 926                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 927                 if (!max_delay)
 928                         max_delay = 1;  /* can't mod w/ 0 */
 929                 in_dev->mr_maxdelay = max_delay;
 930                 if (ih3->qrv)
 931                         in_dev->mr_qrv = ih3->qrv;
 932                 if (!group) { /* general query */
 933                         if (ih3->nsrcs)
 934                                 return true;    /* no sources allowed */
 935                         igmp_gq_start_timer(in_dev);
 936                         return false;
 937                 }
 938                 /* mark sources to include, if group & source-specific */
 939                 mark = ih3->nsrcs != 0;
 940         }
 941
 942         /*
 943          * - Start the timers in all of our membership records
 944          *   that the query applies to for the interface on
 945          *   which the query arrived excl. those that belong
 946          *   to a "local" group (224.0.0.X)
 947          * - For timers already running check if they need to
 948          *   be reset.
 949          * - Use the igmp->igmp_code field as the maximum
 950          *   delay possible
 951          */
 952         rcu_read_lock();
 953         for_each_pmc_rcu(in_dev, im) {
 954                 int changed;
 955
 956                 if (group && group != im->multiaddr)
 957                         continue;
 958                 if (im->multiaddr == IGMP_ALL_HOSTS)
 959                         continue;
 960                 spin_lock_bh(&im->lock);
 961                 if (im->tm_running)
 962                         im->gsquery = im->gsquery && mark;
 963                 else
 964                         im->gsquery = mark;
 965                 changed = !im->gsquery ||
 966                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 967                 spin_unlock_bh(&im->lock);
 968                 if (changed)
 969                         igmp_mod_timer(im, max_delay);
 970         }
 971         rcu_read_unlock();
 972         return false;
 973 }
 974
 975 /* called in rcu_read_lock() section */
 976 int igmp_rcv(struct sk_buff *skb)
 977 {
 978         /* This basically follows the spec line by line -- see RFC1112 */
 979         struct igmphdr *ih;
 980         struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
 981         int len = skb->len;
 982         bool dropped = true;
 983
 984         if (in_dev == NULL)
 985                 goto drop;
 986
 987         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 988                 goto drop;
 989
 990         if (skb_checksum_simple_validate(skb))
 991                 goto drop;
 992
 993         ih = igmp_hdr(skb);
 994         switch (ih->type) {
 995         case IGMP_HOST_MEMBERSHIP_QUERY:
 996                 dropped = igmp_heard_query(in_dev, skb, len);
 997                 break;
 998         case IGMP_HOST_MEMBERSHIP_REPORT:
 999         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1000                 /* Is it our report looped back? */
1001                 if (rt_is_output_route(skb_rtable(skb)))
1002                         break;
1003                 /* don't rely on MC router hearing unicast reports */
1004                 if (skb->pkt_type == PACKET_MULTICAST ||
1005                     skb->pkt_type == PACKET_BROADCAST)
1006                         dropped = igmp_heard_report(in_dev, ih->group);
1007                 break;
1008         case IGMP_PIM:
1009 #ifdef CONFIG_IP_PIMSM_V1
1010                 return pim_rcv_v1(skb);
1011 #endif
1012         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1013         case IGMP_DVMRP:
1014         case IGMP_TRACE:
1015         case IGMP_HOST_LEAVE_MESSAGE:
1016         case IGMP_MTRACE:
1017         case IGMP_MTRACE_RESP:
1018                 break;
1019         default:
1020                 break;
1021         }
1022
1023 drop:
1024         if (dropped)
1025                 kfree_skb(skb);
1026         else
1027                 consume_skb(skb);
1028         return 0;
1029 }
1030
1031 #endif
1032
1033
1034 /*
1035  *      Add a filter to a device
1036  */
1037
1038 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1039 {
1040         char buf[MAX_ADDR_LEN];
1041         struct net_device *dev = in_dev->dev;
1042
1043         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1044            We will get multicast token leakage, when IFF_MULTICAST
1045            is changed. This check should be done in ndo_set_rx_mode
1046            routine. Something sort of:
1047            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1048            --ANK
1049            */
1050         if (arp_mc_map(addr, buf, dev, 0) == 0)
1051                 dev_mc_add(dev, buf);
1052 }
1053
1054 /*
1055  *      Remove a filter from a device
1056  */
1057
1058 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1059 {
1060         char buf[MAX_ADDR_LEN];
1061         struct net_device *dev = in_dev->dev;
1062
1063         if (arp_mc_map(addr, buf, dev, 0) == 0)
1064                 dev_mc_del(dev, buf);
1065 }
1066
1067 #ifdef CONFIG_IP_MULTICAST
1068 /*
1069  * deleted ip_mc_list manipulation
1070  */
1071 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1072 {
1073         struct ip_mc_list *pmc;
1074
1075         /* this is an "ip_mc_list" for convenience; only the fields below
1076          * are actually used. In particular, the refcnt and users are not
1077          * used for management of the delete list. Using the same structure
1078          * for deleted items allows change reports to use common code with
1079          * non-deleted or query-response MCA's.
1080          */
1081         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1082         if (!pmc)
1083                 return;
1084         spin_lock_bh(&im->lock);
1085         pmc->interface = im->interface;
1086         in_dev_hold(in_dev);
1087         pmc->multiaddr = im->multiaddr;
1088         pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1089         pmc->sfmode = im->sfmode;
1090         if (pmc->sfmode == MCAST_INCLUDE) {
1091                 struct ip_sf_list *psf;
1092
1093                 pmc->tomb = im->tomb;
1094                 pmc->sources = im->sources;
1095                 im->tomb = im->sources = NULL;
1096                 for (psf = pmc->sources; psf; psf = psf->sf_next)
1097                         psf->sf_crcount = pmc->crcount;
1098         }
1099         spin_unlock_bh(&im->lock);
1100
1101         spin_lock_bh(&in_dev->mc_tomb_lock);
1102         pmc->next = in_dev->mc_tomb;
1103         in_dev->mc_tomb = pmc;
1104         spin_unlock_bh(&in_dev->mc_tomb_lock);
1105 }
1106
1107 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1108 {
1109         struct ip_mc_list *pmc, *pmc_prev;
1110         struct ip_sf_list *psf, *psf_next;
1111
1112         spin_lock_bh(&in_dev->mc_tomb_lock);
1113         pmc_prev = NULL;
1114         for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1115                 if (pmc->multiaddr == multiaddr)
1116                         break;
1117                 pmc_prev = pmc;
1118         }
1119         if (pmc) {
1120                 if (pmc_prev)
1121                         pmc_prev->next = pmc->next;
1122                 else
1123                         in_dev->mc_tomb = pmc->next;
1124         }
1125         spin_unlock_bh(&in_dev->mc_tomb_lock);
1126         if (pmc) {
1127                 for (psf = pmc->tomb; psf; psf = psf_next) {
1128                         psf_next = psf->sf_next;
1129                         kfree(psf);
1130                 }
1131                 in_dev_put(pmc->interface);
1132                 kfree(pmc);
1133         }
1134 }
1135
1136 static void igmpv3_clear_delrec(struct in_device *in_dev)
1137 {
1138         struct ip_mc_list *pmc, *nextpmc;
1139
1140         spin_lock_bh(&in_dev->mc_tomb_lock);
1141         pmc = in_dev->mc_tomb;
1142         in_dev->mc_tomb = NULL;
1143         spin_unlock_bh(&in_dev->mc_tomb_lock);
1144
1145         for (; pmc; pmc = nextpmc) {
1146                 nextpmc = pmc->next;
1147                 ip_mc_clear_src(pmc);
1148                 in_dev_put(pmc->interface);
1149                 kfree(pmc);
1150         }
1151         /* clear dead sources, too */
1152         rcu_read_lock();
1153         for_each_pmc_rcu(in_dev, pmc) {
1154                 struct ip_sf_list *psf, *psf_next;
1155
1156                 spin_lock_bh(&pmc->lock);
1157                 psf = pmc->tomb;
1158                 pmc->tomb = NULL;
1159                 spin_unlock_bh(&pmc->lock);
1160                 for (; psf; psf = psf_next) {
1161                         psf_next = psf->sf_next;
1162                         kfree(psf);
1163                 }
1164         }
1165         rcu_read_unlock();
1166 }
1167 #endif
1168
1169 static void igmp_group_dropped(struct ip_mc_list *im)
1170 {
1171         struct in_device *in_dev = im->interface;
1172 #ifdef CONFIG_IP_MULTICAST
1173         int reporter;
1174 #endif
1175
1176         if (im->loaded) {
1177                 im->loaded = 0;
1178                 ip_mc_filter_del(in_dev, im->multiaddr);
1179         }
1180
1181 #ifdef CONFIG_IP_MULTICAST
1182         if (im->multiaddr == IGMP_ALL_HOSTS)
1183                 return;
1184
1185         reporter = im->reporter;
1186         igmp_stop_timer(im);
1187
1188         if (!in_dev->dead) {
1189                 if (IGMP_V1_SEEN(in_dev))
1190                         return;
1191                 if (IGMP_V2_SEEN(in_dev)) {
1192                         if (reporter)
1193                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1194                         return;
1195                 }
1196                 /* IGMPv3 */
1197                 igmpv3_add_delrec(in_dev, im);
1198
1199                 igmp_ifc_event(in_dev);
1200         }
1201 #endif
1202 }
1203
1204 static void igmp_group_added(struct ip_mc_list *im)
1205 {
1206         struct in_device *in_dev = im->interface;
1207
1208         if (im->loaded == 0) {
1209                 im->loaded = 1;
1210                 ip_mc_filter_add(in_dev, im->multiaddr);
1211         }
1212
1213 #ifdef CONFIG_IP_MULTICAST
1214         if (im->multiaddr == IGMP_ALL_HOSTS)
1215                 return;
1216
1217         if (in_dev->dead)
1218                 return;
1219         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1220                 spin_lock_bh(&im->lock);
1221                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1222                 spin_unlock_bh(&im->lock);
1223                 return;
1224         }
1225         /* else, v3 */
1226
1227         im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1228         igmp_ifc_event(in_dev);
1229 #endif
1230 }
1231
1232
1233 /*
1234  *      Multicast list managers
1235  */
1236
1237 static u32 ip_mc_hash(const struct ip_mc_list *im)
1238 {
1239         return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1240 }
1241
1242 static void ip_mc_hash_add(struct in_device *in_dev,
1243                            struct ip_mc_list *im)
1244 {
1245         struct ip_mc_list __rcu **mc_hash;
1246         u32 hash;
1247
1248         mc_hash = rtnl_dereference(in_dev->mc_hash);
1249         if (mc_hash) {
1250                 hash = ip_mc_hash(im);
1251                 im->next_hash = mc_hash[hash];
1252                 rcu_assign_pointer(mc_hash[hash], im);
1253                 return;
1254         }
1255
1256         /* do not use a hash table for small number of items */
1257         if (in_dev->mc_count < 4)
1258                 return;
1259
1260         mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1261                           GFP_KERNEL);
1262         if (!mc_hash)
1263                 return;
1264
1265         for_each_pmc_rtnl(in_dev, im) {
1266                 hash = ip_mc_hash(im);
1267                 im->next_hash = mc_hash[hash];
1268                 RCU_INIT_POINTER(mc_hash[hash], im);
1269         }
1270
1271         rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1272 }
1273
1274 static void ip_mc_hash_remove(struct in_device *in_dev,
1275                               struct ip_mc_list *im)
1276 {
1277         struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1278         struct ip_mc_list *aux;
1279
1280         if (!mc_hash)
1281                 return;
1282         mc_hash += ip_mc_hash(im);
1283         while ((aux = rtnl_dereference(*mc_hash)) != im)
1284                 mc_hash = &aux->next_hash;
1285         *mc_hash = im->next_hash;
1286 }
1287
1288
1289 /*
1290  *      A socket has joined a multicast group on device dev.
1291  */
1292
1293 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1294 {
1295         struct ip_mc_list *im;
1296
1297         ASSERT_RTNL();
1298
1299         for_each_pmc_rtnl(in_dev, im) {
1300                 if (im->multiaddr == addr) {
1301                         im->users++;
1302                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1303                         goto out;
1304                 }
1305         }
1306
1307         im = kzalloc(sizeof(*im), GFP_KERNEL);
1308         if (!im)
1309                 goto out;
1310
1311         im->users = 1;
1312         im->interface = in_dev;
1313         in_dev_hold(in_dev);
1314         im->multiaddr = addr;
1315         /* initial mode is (EX, empty) */
1316         im->sfmode = MCAST_EXCLUDE;
1317         im->sfcount[MCAST_EXCLUDE] = 1;
1318         atomic_set(&im->refcnt, 1);
1319         spin_lock_init(&im->lock);
1320 #ifdef CONFIG_IP_MULTICAST
1321         setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1322         im->unsolicit_count = sysctl_igmp_qrv;
1323 #endif
1324
1325         im->next_rcu = in_dev->mc_list;
1326         in_dev->mc_count++;
1327         rcu_assign_pointer(in_dev->mc_list, im);
1328
1329         ip_mc_hash_add(in_dev, im);
1330
1331 #ifdef CONFIG_IP_MULTICAST
1332         igmpv3_del_delrec(in_dev, im->multiaddr);
1333 #endif
1334         igmp_group_added(im);
1335         if (!in_dev->dead)
1336                 ip_rt_multicast_event(in_dev);
1337 out:
1338         return;
1339 }
1340 EXPORT_SYMBOL(ip_mc_inc_group);
1341
1342 /*
1343  *      Resend IGMP JOIN report; used by netdev notifier.
1344  */
1345 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1346 {
1347 #ifdef CONFIG_IP_MULTICAST
1348         struct ip_mc_list *im;
1349         int type;
1350
1351         ASSERT_RTNL();
1352
1353         for_each_pmc_rtnl(in_dev, im) {
1354                 if (im->multiaddr == IGMP_ALL_HOSTS)
1355                         continue;
1356
1357                 /* a failover is happening and switches
1358                  * must be notified immediately
1359                  */
1360                 if (IGMP_V1_SEEN(in_dev))
1361                         type = IGMP_HOST_MEMBERSHIP_REPORT;
1362                 else if (IGMP_V2_SEEN(in_dev))
1363                         type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1364                 else
1365                         type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1366                 igmp_send_report(in_dev, im, type);
1367         }
1368 #endif
1369 }
1370
1371 /*
1372  *      A socket has left a multicast group on device dev
1373  */
1374
1375 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1376 {
1377         struct ip_mc_list *i;
1378         struct ip_mc_list __rcu **ip;
1379
1380         ASSERT_RTNL();
1381
1382         for (ip = &in_dev->mc_list;
1383              (i = rtnl_dereference(*ip)) != NULL;
1384              ip = &i->next_rcu) {
1385                 if (i->multiaddr == addr) {
1386                         if (--i->users == 0) {
1387                                 ip_mc_hash_remove(in_dev, i);
1388                                 *ip = i->next_rcu;
1389                                 in_dev->mc_count--;
1390                                 igmp_group_dropped(i);
1391                                 ip_mc_clear_src(i);
1392
1393                                 if (!in_dev->dead)
1394                                         ip_rt_multicast_event(in_dev);
1395
1396                                 ip_ma_put(i);
1397                                 return;
1398                         }
1399                         break;
1400                 }
1401         }
1402 }
1403 EXPORT_SYMBOL(ip_mc_dec_group);
1404
1405 /* Device changing type */
1406
1407 void ip_mc_unmap(struct in_device *in_dev)
1408 {
1409         struct ip_mc_list *pmc;
1410
1411         ASSERT_RTNL();
1412
1413         for_each_pmc_rtnl(in_dev, pmc)
1414                 igmp_group_dropped(pmc);
1415 }
1416
1417 void ip_mc_remap(struct in_device *in_dev)
1418 {
1419         struct ip_mc_list *pmc;
1420
1421         ASSERT_RTNL();
1422
1423         for_each_pmc_rtnl(in_dev, pmc)
1424                 igmp_group_added(pmc);
1425 }
1426
1427 /* Device going down */
1428
1429 void ip_mc_down(struct in_device *in_dev)
1430 {
1431         struct ip_mc_list *pmc;
1432
1433         ASSERT_RTNL();
1434
1435         for_each_pmc_rtnl(in_dev, pmc)
1436                 igmp_group_dropped(pmc);
1437
1438 #ifdef CONFIG_IP_MULTICAST
1439         in_dev->mr_ifc_count = 0;
1440         if (del_timer(&in_dev->mr_ifc_timer))
1441                 __in_dev_put(in_dev);
1442         in_dev->mr_gq_running = 0;
1443         if (del_timer(&in_dev->mr_gq_timer))
1444                 __in_dev_put(in_dev);
1445         igmpv3_clear_delrec(in_dev);
1446 #endif
1447
1448         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1449 }
1450
1451 void ip_mc_init_dev(struct in_device *in_dev)
1452 {
1453         ASSERT_RTNL();
1454
1455 #ifdef CONFIG_IP_MULTICAST
1456         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1457                         (unsigned long)in_dev);
1458         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1459                         (unsigned long)in_dev);
1460         in_dev->mr_qrv = sysctl_igmp_qrv;
1461 #endif
1462
1463         spin_lock_init(&in_dev->mc_tomb_lock);
1464 }
1465
1466 /* Device going up */
1467
1468 void ip_mc_up(struct in_device *in_dev)
1469 {
1470         struct ip_mc_list *pmc;
1471
1472         ASSERT_RTNL();
1473
1474 #ifdef CONFIG_IP_MULTICAST
1475         in_dev->mr_qrv = sysctl_igmp_qrv;
1476 #endif
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 #ifdef CONFIG_IP_MULTICAST
1544 int sysctl_igmp_qrv __read_mostly = IGMP_Query_Robustness_Variable;
1545 #endif
1546
1547 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1548         __be32 *psfsrc)
1549 {
1550         struct ip_sf_list *psf, *psf_prev;
1551         int rv = 0;
1552
1553         psf_prev = NULL;
1554         for (psf = pmc->sources; psf; psf = psf->sf_next) {
1555                 if (psf->sf_inaddr == *psfsrc)
1556                         break;
1557                 psf_prev = psf;
1558         }
1559         if (!psf || psf->sf_count[sfmode] == 0) {
1560                 /* source filter not found, or count wrong =>  bug */
1561                 return -ESRCH;
1562         }
1563         psf->sf_count[sfmode]--;
1564         if (psf->sf_count[sfmode] == 0) {
1565                 ip_rt_multicast_event(pmc->interface);
1566         }
1567         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1568 #ifdef CONFIG_IP_MULTICAST
1569                 struct in_device *in_dev = pmc->interface;
1570 #endif
1571
1572                 /* no more filters for this source */
1573                 if (psf_prev)
1574                         psf_prev->sf_next = psf->sf_next;
1575                 else
1576                         pmc->sources = psf->sf_next;
1577 #ifdef CONFIG_IP_MULTICAST
1578                 if (psf->sf_oldin &&
1579                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1580                         psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1581                         psf->sf_next = pmc->tomb;
1582                         pmc->tomb = psf;
1583                         rv = 1;
1584                 } else
1585 #endif
1586                         kfree(psf);
1587         }
1588         return rv;
1589 }
1590
1591 #ifndef CONFIG_IP_MULTICAST
1592 #define igmp_ifc_event(x)       do { } while (0)
1593 #endif
1594
1595 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1596                          int sfcount, __be32 *psfsrc, int delta)
1597 {
1598         struct ip_mc_list *pmc;
1599         int     changerec = 0;
1600         int     i, err;
1601
1602         if (!in_dev)
1603                 return -ENODEV;
1604         rcu_read_lock();
1605         for_each_pmc_rcu(in_dev, pmc) {
1606                 if (*pmca == pmc->multiaddr)
1607                         break;
1608         }
1609         if (!pmc) {
1610                 /* MCA not found?? bug */
1611                 rcu_read_unlock();
1612                 return -ESRCH;
1613         }
1614         spin_lock_bh(&pmc->lock);
1615         rcu_read_unlock();
1616 #ifdef CONFIG_IP_MULTICAST
1617         sf_markstate(pmc);
1618 #endif
1619         if (!delta) {
1620                 err = -EINVAL;
1621                 if (!pmc->sfcount[sfmode])
1622                         goto out_unlock;
1623                 pmc->sfcount[sfmode]--;
1624         }
1625         err = 0;
1626         for (i = 0; i < sfcount; i++) {
1627                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1628
1629                 changerec |= rv > 0;
1630                 if (!err && rv < 0)
1631                         err = rv;
1632         }
1633         if (pmc->sfmode == MCAST_EXCLUDE &&
1634             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1635             pmc->sfcount[MCAST_INCLUDE]) {
1636 #ifdef CONFIG_IP_MULTICAST
1637                 struct ip_sf_list *psf;
1638 #endif
1639
1640                 /* filter mode change */
1641                 pmc->sfmode = MCAST_INCLUDE;
1642 #ifdef CONFIG_IP_MULTICAST
1643                 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
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 ?: sysctl_igmp_qrv;
1822                 in_dev->mr_ifc_count = pmc->crcount;
1823                 for (psf = pmc->sources; psf; psf = psf->sf_next)
1824                         psf->sf_crcount = 0;
1825                 igmp_ifc_event(in_dev);
1826         } else if (sf_setstate(pmc)) {
1827                 igmp_ifc_event(in_dev);
1828 #endif
1829         }
1830         spin_unlock_bh(&pmc->lock);
1831         return err;
1832 }
1833
1834 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1835 {
1836         struct ip_sf_list *psf, *nextpsf;
1837
1838         for (psf = pmc->tomb; psf; psf = nextpsf) {
1839                 nextpsf = psf->sf_next;
1840                 kfree(psf);
1841         }
1842         pmc->tomb = NULL;
1843         for (psf = pmc->sources; psf; psf = nextpsf) {
1844                 nextpsf = psf->sf_next;
1845                 kfree(psf);
1846         }
1847         pmc->sources = NULL;
1848         pmc->sfmode = MCAST_EXCLUDE;
1849         pmc->sfcount[MCAST_INCLUDE] = 0;
1850         pmc->sfcount[MCAST_EXCLUDE] = 1;
1851 }
1852
1853
1854 /*
1855  * Join a multicast group
1856  */
1857 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1858 {
1859         int err;
1860         __be32 addr = imr->imr_multiaddr.s_addr;
1861         struct ip_mc_socklist *iml = NULL, *i;
1862         struct in_device *in_dev;
1863         struct inet_sock *inet = inet_sk(sk);
1864         struct net *net = sock_net(sk);
1865         int ifindex;
1866         int count = 0;
1867
1868         if (!ipv4_is_multicast(addr))
1869                 return -EINVAL;
1870
1871         rtnl_lock();
1872
1873         in_dev = ip_mc_find_dev(net, imr);
1874
1875         if (!in_dev) {
1876                 iml = NULL;
1877                 err = -ENODEV;
1878                 goto done;
1879         }
1880
1881         err = -EADDRINUSE;
1882         ifindex = imr->imr_ifindex;
1883         for_each_pmc_rtnl(inet, i) {
1884                 if (i->multi.imr_multiaddr.s_addr == addr &&
1885                     i->multi.imr_ifindex == ifindex)
1886                         goto done;
1887                 count++;
1888         }
1889         err = -ENOBUFS;
1890         if (count >= sysctl_igmp_max_memberships)
1891                 goto done;
1892         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1893         if (iml == NULL)
1894                 goto done;
1895
1896         memcpy(&iml->multi, imr, sizeof(*imr));
1897         iml->next_rcu = inet->mc_list;
1898         iml->sflist = NULL;
1899         iml->sfmode = MCAST_EXCLUDE;
1900         rcu_assign_pointer(inet->mc_list, iml);
1901         ip_mc_inc_group(in_dev, addr);
1902         err = 0;
1903 done:
1904         rtnl_unlock();
1905         return err;
1906 }
1907 EXPORT_SYMBOL(ip_mc_join_group);
1908
1909 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1910                            struct in_device *in_dev)
1911 {
1912         struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1913         int err;
1914
1915         if (psf == NULL) {
1916                 /* any-source empty exclude case */
1917                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1918                         iml->sfmode, 0, NULL, 0);
1919         }
1920         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1921                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1922         RCU_INIT_POINTER(iml->sflist, NULL);
1923         /* decrease mem now to avoid the memleak warning */
1924         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1925         kfree_rcu(psf, rcu);
1926         return err;
1927 }
1928
1929 /*
1930  *      Ask a socket to leave a group.
1931  */
1932
1933 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1934 {
1935         struct inet_sock *inet = inet_sk(sk);
1936         struct ip_mc_socklist *iml;
1937         struct ip_mc_socklist __rcu **imlp;
1938         struct in_device *in_dev;
1939         struct net *net = sock_net(sk);
1940         __be32 group = imr->imr_multiaddr.s_addr;
1941         u32 ifindex;
1942         int ret = -EADDRNOTAVAIL;
1943
1944         rtnl_lock();
1945         in_dev = ip_mc_find_dev(net, imr);
1946         if (!in_dev) {
1947                 ret = -ENODEV;
1948                 goto out;
1949         }
1950         ifindex = imr->imr_ifindex;
1951         for (imlp = &inet->mc_list;
1952              (iml = rtnl_dereference(*imlp)) != NULL;
1953              imlp = &iml->next_rcu) {
1954                 if (iml->multi.imr_multiaddr.s_addr != group)
1955                         continue;
1956                 if (ifindex) {
1957                         if (iml->multi.imr_ifindex != ifindex)
1958                                 continue;
1959                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1960                                 iml->multi.imr_address.s_addr)
1961                         continue;
1962
1963                 (void) ip_mc_leave_src(sk, iml, in_dev);
1964
1965                 *imlp = iml->next_rcu;
1966
1967                 ip_mc_dec_group(in_dev, group);
1968                 rtnl_unlock();
1969                 /* decrease mem now to avoid the memleak warning */
1970                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1971                 kfree_rcu(iml, rcu);
1972                 return 0;
1973         }
1974 out:
1975         rtnl_unlock();
1976         return ret;
1977 }
1978 EXPORT_SYMBOL(ip_mc_leave_group);
1979
1980 int ip_mc_source(int add, int omode, struct sock *sk, struct
1981         ip_mreq_source *mreqs, int ifindex)
1982 {
1983         int err;
1984         struct ip_mreqn imr;
1985         __be32 addr = mreqs->imr_multiaddr;
1986         struct ip_mc_socklist *pmc;
1987         struct in_device *in_dev = NULL;
1988         struct inet_sock *inet = inet_sk(sk);
1989         struct ip_sf_socklist *psl;
1990         struct net *net = sock_net(sk);
1991         int leavegroup = 0;
1992         int i, j, rv;
1993
1994         if (!ipv4_is_multicast(addr))
1995                 return -EINVAL;
1996
1997         rtnl_lock();
1998
1999         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2000         imr.imr_address.s_addr = mreqs->imr_interface;
2001         imr.imr_ifindex = ifindex;
2002         in_dev = ip_mc_find_dev(net, &imr);
2003
2004         if (!in_dev) {
2005                 err = -ENODEV;
2006                 goto done;
2007         }
2008         err = -EADDRNOTAVAIL;
2009
2010         for_each_pmc_rtnl(inet, pmc) {
2011                 if ((pmc->multi.imr_multiaddr.s_addr ==
2012                      imr.imr_multiaddr.s_addr) &&
2013                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
2014                         break;
2015         }
2016         if (!pmc) {             /* must have a prior join */
2017                 err = -EINVAL;
2018                 goto done;
2019         }
2020         /* if a source filter was set, must be the same mode as before */
2021         if (pmc->sflist) {
2022                 if (pmc->sfmode != omode) {
2023                         err = -EINVAL;
2024                         goto done;
2025                 }
2026         } else if (pmc->sfmode != omode) {
2027                 /* allow mode switches for empty-set filters */
2028                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2029                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2030                         NULL, 0);
2031                 pmc->sfmode = omode;
2032         }
2033
2034         psl = rtnl_dereference(pmc->sflist);
2035         if (!add) {
2036                 if (!psl)
2037                         goto done;      /* err = -EADDRNOTAVAIL */
2038                 rv = !0;
2039                 for (i = 0; i < psl->sl_count; i++) {
2040                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2041                                 sizeof(__be32));
2042                         if (rv == 0)
2043                                 break;
2044                 }
2045                 if (rv)         /* source not found */
2046                         goto done;      /* err = -EADDRNOTAVAIL */
2047
2048                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2049                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2050                         leavegroup = 1;
2051                         goto done;
2052                 }
2053
2054                 /* update the interface filter */
2055                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2056                         &mreqs->imr_sourceaddr, 1);
2057
2058                 for (j = i+1; j < psl->sl_count; j++)
2059                         psl->sl_addr[j-1] = psl->sl_addr[j];
2060                 psl->sl_count--;
2061                 err = 0;
2062                 goto done;
2063         }
2064         /* else, add a new source to the filter */
2065
2066         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2067                 err = -ENOBUFS;
2068                 goto done;
2069         }
2070         if (!psl || psl->sl_count == psl->sl_max) {
2071                 struct ip_sf_socklist *newpsl;
2072                 int count = IP_SFBLOCK;
2073
2074                 if (psl)
2075                         count += psl->sl_max;
2076                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2077                 if (!newpsl) {
2078                         err = -ENOBUFS;
2079                         goto done;
2080                 }
2081                 newpsl->sl_max = count;
2082                 newpsl->sl_count = count - IP_SFBLOCK;
2083                 if (psl) {
2084                         for (i = 0; i < psl->sl_count; i++)
2085                                 newpsl->sl_addr[i] = psl->sl_addr[i];
2086                         /* decrease mem now to avoid the memleak warning */
2087                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2088                         kfree_rcu(psl, rcu);
2089                 }
2090                 rcu_assign_pointer(pmc->sflist, newpsl);
2091                 psl = newpsl;
2092         }
2093         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2094         for (i = 0; i < psl->sl_count; i++) {
2095                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2096                         sizeof(__be32));
2097                 if (rv == 0)
2098                         break;
2099         }
2100         if (rv == 0)            /* address already there is an error */
2101                 goto done;
2102         for (j = psl->sl_count-1; j >= i; j--)
2103                 psl->sl_addr[j+1] = psl->sl_addr[j];
2104         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2105         psl->sl_count++;
2106         err = 0;
2107         /* update the interface list */
2108         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2109                 &mreqs->imr_sourceaddr, 1);
2110 done:
2111         rtnl_unlock();
2112         if (leavegroup)
2113                 return ip_mc_leave_group(sk, &imr);
2114         return err;
2115 }
2116
2117 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2118 {
2119         int err = 0;
2120         struct ip_mreqn imr;
2121         __be32 addr = msf->imsf_multiaddr;
2122         struct ip_mc_socklist *pmc;
2123         struct in_device *in_dev;
2124         struct inet_sock *inet = inet_sk(sk);
2125         struct ip_sf_socklist *newpsl, *psl;
2126         struct net *net = sock_net(sk);
2127         int leavegroup = 0;
2128
2129         if (!ipv4_is_multicast(addr))
2130                 return -EINVAL;
2131         if (msf->imsf_fmode != MCAST_INCLUDE &&
2132             msf->imsf_fmode != MCAST_EXCLUDE)
2133                 return -EINVAL;
2134
2135         rtnl_lock();
2136
2137         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2138         imr.imr_address.s_addr = msf->imsf_interface;
2139         imr.imr_ifindex = ifindex;
2140         in_dev = ip_mc_find_dev(net, &imr);
2141
2142         if (!in_dev) {
2143                 err = -ENODEV;
2144                 goto done;
2145         }
2146
2147         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2148         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2149                 leavegroup = 1;
2150                 goto done;
2151         }
2152
2153         for_each_pmc_rtnl(inet, pmc) {
2154                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2155                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2156                         break;
2157         }
2158         if (!pmc) {             /* must have a prior join */
2159                 err = -EINVAL;
2160                 goto done;
2161         }
2162         if (msf->imsf_numsrc) {
2163                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2164                                                            GFP_KERNEL);
2165                 if (!newpsl) {
2166                         err = -ENOBUFS;
2167                         goto done;
2168                 }
2169                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2170                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2171                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2172                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2173                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2174                 if (err) {
2175                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2176                         goto done;
2177                 }
2178         } else {
2179                 newpsl = NULL;
2180                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2181                                      msf->imsf_fmode, 0, NULL, 0);
2182         }
2183         psl = rtnl_dereference(pmc->sflist);
2184         if (psl) {
2185                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2186                         psl->sl_count, psl->sl_addr, 0);
2187                 /* decrease mem now to avoid the memleak warning */
2188                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2189                 kfree_rcu(psl, rcu);
2190         } else
2191                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2192                         0, NULL, 0);
2193         rcu_assign_pointer(pmc->sflist, newpsl);
2194         pmc->sfmode = msf->imsf_fmode;
2195         err = 0;
2196 done:
2197         rtnl_unlock();
2198         if (leavegroup)
2199                 err = ip_mc_leave_group(sk, &imr);
2200         return err;
2201 }
2202
2203 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2204         struct ip_msfilter __user *optval, int __user *optlen)
2205 {
2206         int err, len, count, copycount;
2207         struct ip_mreqn imr;
2208         __be32 addr = msf->imsf_multiaddr;
2209         struct ip_mc_socklist *pmc;
2210         struct in_device *in_dev;
2211         struct inet_sock *inet = inet_sk(sk);
2212         struct ip_sf_socklist *psl;
2213         struct net *net = sock_net(sk);
2214
2215         if (!ipv4_is_multicast(addr))
2216                 return -EINVAL;
2217
2218         rtnl_lock();
2219
2220         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2221         imr.imr_address.s_addr = msf->imsf_interface;
2222         imr.imr_ifindex = 0;
2223         in_dev = ip_mc_find_dev(net, &imr);
2224
2225         if (!in_dev) {
2226                 err = -ENODEV;
2227                 goto done;
2228         }
2229         err = -EADDRNOTAVAIL;
2230
2231         for_each_pmc_rtnl(inet, pmc) {
2232                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2233                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2234                         break;
2235         }
2236         if (!pmc)               /* must have a prior join */
2237                 goto done;
2238         msf->imsf_fmode = pmc->sfmode;
2239         psl = rtnl_dereference(pmc->sflist);
2240         rtnl_unlock();
2241         if (!psl) {
2242                 len = 0;
2243                 count = 0;
2244         } else {
2245                 count = psl->sl_count;
2246         }
2247         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2248         len = copycount * sizeof(psl->sl_addr[0]);
2249         msf->imsf_numsrc = count;
2250         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2251             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2252                 return -EFAULT;
2253         }
2254         if (len &&
2255             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2256                 return -EFAULT;
2257         return 0;
2258 done:
2259         rtnl_unlock();
2260         return err;
2261 }
2262
2263 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2264         struct group_filter __user *optval, int __user *optlen)
2265 {
2266         int err, i, count, copycount;
2267         struct sockaddr_in *psin;
2268         __be32 addr;
2269         struct ip_mc_socklist *pmc;
2270         struct inet_sock *inet = inet_sk(sk);
2271         struct ip_sf_socklist *psl;
2272
2273         psin = (struct sockaddr_in *)&gsf->gf_group;
2274         if (psin->sin_family != AF_INET)
2275                 return -EINVAL;
2276         addr = psin->sin_addr.s_addr;
2277         if (!ipv4_is_multicast(addr))
2278                 return -EINVAL;
2279
2280         rtnl_lock();
2281
2282         err = -EADDRNOTAVAIL;
2283
2284         for_each_pmc_rtnl(inet, pmc) {
2285                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2286                     pmc->multi.imr_ifindex == gsf->gf_interface)
2287                         break;
2288         }
2289         if (!pmc)               /* must have a prior join */
2290                 goto done;
2291         gsf->gf_fmode = pmc->sfmode;
2292         psl = rtnl_dereference(pmc->sflist);
2293         rtnl_unlock();
2294         count = psl ? psl->sl_count : 0;
2295         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2296         gsf->gf_numsrc = count;
2297         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2298             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2299                 return -EFAULT;
2300         }
2301         for (i = 0; i < copycount; i++) {
2302                 struct sockaddr_storage ss;
2303
2304                 psin = (struct sockaddr_in *)&ss;
2305                 memset(&ss, 0, sizeof(ss));
2306                 psin->sin_family = AF_INET;
2307                 psin->sin_addr.s_addr = psl->sl_addr[i];
2308                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2309                         return -EFAULT;
2310         }
2311         return 0;
2312 done:
2313         rtnl_unlock();
2314         return err;
2315 }
2316
2317 /*
2318  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2319  */
2320 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2321 {
2322         struct inet_sock *inet = inet_sk(sk);
2323         struct ip_mc_socklist *pmc;
2324         struct ip_sf_socklist *psl;
2325         int i;
2326         int ret;
2327
2328         ret = 1;
2329         if (!ipv4_is_multicast(loc_addr))
2330                 goto out;
2331
2332         rcu_read_lock();
2333         for_each_pmc_rcu(inet, pmc) {
2334                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2335                     pmc->multi.imr_ifindex == dif)
2336                         break;
2337         }
2338         ret = inet->mc_all;
2339         if (!pmc)
2340                 goto unlock;
2341         psl = rcu_dereference(pmc->sflist);
2342         ret = (pmc->sfmode == MCAST_EXCLUDE);
2343         if (!psl)
2344                 goto unlock;
2345
2346         for (i = 0; i < psl->sl_count; i++) {
2347                 if (psl->sl_addr[i] == rmt_addr)
2348                         break;
2349         }
2350         ret = 0;
2351         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2352                 goto unlock;
2353         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2354                 goto unlock;
2355         ret = 1;
2356 unlock:
2357         rcu_read_unlock();
2358 out:
2359         return ret;
2360 }
2361
2362 /*
2363  *      A socket is closing.
2364  */
2365
2366 void ip_mc_drop_socket(struct sock *sk)
2367 {
2368         struct inet_sock *inet = inet_sk(sk);
2369         struct ip_mc_socklist *iml;
2370         struct net *net = sock_net(sk);
2371
2372         if (inet->mc_list == NULL)
2373                 return;
2374
2375         rtnl_lock();
2376         while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2377                 struct in_device *in_dev;
2378
2379                 inet->mc_list = iml->next_rcu;
2380                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2381                 (void) ip_mc_leave_src(sk, iml, in_dev);
2382                 if (in_dev != NULL)
2383                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2384                 /* decrease mem now to avoid the memleak warning */
2385                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2386                 kfree_rcu(iml, rcu);
2387         }
2388         rtnl_unlock();
2389 }
2390
2391 /* called with rcu_read_lock() */
2392 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2393 {
2394         struct ip_mc_list *im;
2395         struct ip_mc_list __rcu **mc_hash;
2396         struct ip_sf_list *psf;
2397         int rv = 0;
2398
2399         mc_hash = rcu_dereference(in_dev->mc_hash);
2400         if (mc_hash) {
2401                 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2402
2403                 for (im = rcu_dereference(mc_hash[hash]);
2404                      im != NULL;
2405                      im = rcu_dereference(im->next_hash)) {
2406                         if (im->multiaddr == mc_addr)
2407                                 break;
2408                 }
2409         } else {
2410                 for_each_pmc_rcu(in_dev, im) {
2411                         if (im->multiaddr == mc_addr)
2412                                 break;
2413                 }
2414         }
2415         if (im && proto == IPPROTO_IGMP) {
2416                 rv = 1;
2417         } else if (im) {
2418                 if (src_addr) {
2419                         for (psf = im->sources; psf; psf = psf->sf_next) {
2420                                 if (psf->sf_inaddr == src_addr)
2421                                         break;
2422                         }
2423                         if (psf)
2424                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2425                                         psf->sf_count[MCAST_EXCLUDE] !=
2426                                         im->sfcount[MCAST_EXCLUDE];
2427                         else
2428                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2429                 } else
2430                         rv = 1; /* unspecified source; tentatively allow */
2431         }
2432         return rv;
2433 }
2434
2435 #if defined(CONFIG_PROC_FS)
2436 struct igmp_mc_iter_state {
2437         struct seq_net_private p;
2438         struct net_device *dev;
2439         struct in_device *in_dev;
2440 };
2441
2442 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2443
2444 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2445 {
2446         struct net *net = seq_file_net(seq);
2447         struct ip_mc_list *im = NULL;
2448         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2449
2450         state->in_dev = NULL;
2451         for_each_netdev_rcu(net, state->dev) {
2452                 struct in_device *in_dev;
2453
2454                 in_dev = __in_dev_get_rcu(state->dev);
2455                 if (!in_dev)
2456                         continue;
2457                 im = rcu_dereference(in_dev->mc_list);
2458                 if (im) {
2459                         state->in_dev = in_dev;
2460                         break;
2461                 }
2462         }
2463         return im;
2464 }
2465
2466 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2467 {
2468         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2469
2470         im = rcu_dereference(im->next_rcu);
2471         while (!im) {
2472                 state->dev = next_net_device_rcu(state->dev);
2473                 if (!state->dev) {
2474                         state->in_dev = NULL;
2475                         break;
2476                 }
2477                 state->in_dev = __in_dev_get_rcu(state->dev);
2478                 if (!state->in_dev)
2479                         continue;
2480                 im = rcu_dereference(state->in_dev->mc_list);
2481         }
2482         return im;
2483 }
2484
2485 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2486 {
2487         struct ip_mc_list *im = igmp_mc_get_first(seq);
2488         if (im)
2489                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2490                         --pos;
2491         return pos ? NULL : im;
2492 }
2493
2494 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2495         __acquires(rcu)
2496 {
2497         rcu_read_lock();
2498         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2499 }
2500
2501 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2502 {
2503         struct ip_mc_list *im;
2504         if (v == SEQ_START_TOKEN)
2505                 im = igmp_mc_get_first(seq);
2506         else
2507                 im = igmp_mc_get_next(seq, v);
2508         ++*pos;
2509         return im;
2510 }
2511
2512 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2513         __releases(rcu)
2514 {
2515         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2516
2517         state->in_dev = NULL;
2518         state->dev = NULL;
2519         rcu_read_unlock();
2520 }
2521
2522 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2523 {
2524         if (v == SEQ_START_TOKEN)
2525                 seq_puts(seq,
2526                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2527         else {
2528                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2529                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2530                 char   *querier;
2531                 long delta;
2532
2533 #ifdef CONFIG_IP_MULTICAST
2534                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2535                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2536                           "V3";
2537 #else
2538                 querier = "NONE";
2539 #endif
2540
2541                 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2542                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2543                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2544                 }
2545
2546                 delta = im->timer.expires - jiffies;
2547                 seq_printf(seq,
2548                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2549                            im->multiaddr, im->users,
2550                            im->tm_running,
2551                            im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2552                            im->reporter);
2553         }
2554         return 0;
2555 }
2556
2557 static const struct seq_operations igmp_mc_seq_ops = {
2558         .start  =       igmp_mc_seq_start,
2559         .next   =       igmp_mc_seq_next,
2560         .stop   =       igmp_mc_seq_stop,
2561         .show   =       igmp_mc_seq_show,
2562 };
2563
2564 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2565 {
2566         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2567                         sizeof(struct igmp_mc_iter_state));
2568 }
2569
2570 static const struct file_operations igmp_mc_seq_fops = {
2571         .owner          =       THIS_MODULE,
2572         .open           =       igmp_mc_seq_open,
2573         .read           =       seq_read,
2574         .llseek         =       seq_lseek,
2575         .release        =       seq_release_net,
2576 };
2577
2578 struct igmp_mcf_iter_state {
2579         struct seq_net_private p;
2580         struct net_device *dev;
2581         struct in_device *idev;
2582         struct ip_mc_list *im;
2583 };
2584
2585 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2586
2587 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2588 {
2589         struct net *net = seq_file_net(seq);
2590         struct ip_sf_list *psf = NULL;
2591         struct ip_mc_list *im = NULL;
2592         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2593
2594         state->idev = NULL;
2595         state->im = NULL;
2596         for_each_netdev_rcu(net, state->dev) {
2597                 struct in_device *idev;
2598                 idev = __in_dev_get_rcu(state->dev);
2599                 if (unlikely(idev == NULL))
2600                         continue;
2601                 im = rcu_dereference(idev->mc_list);
2602                 if (likely(im != NULL)) {
2603                         spin_lock_bh(&im->lock);
2604                         psf = im->sources;
2605                         if (likely(psf != NULL)) {
2606                                 state->im = im;
2607                                 state->idev = idev;
2608                                 break;
2609                         }
2610                         spin_unlock_bh(&im->lock);
2611                 }
2612         }
2613         return psf;
2614 }
2615
2616 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2617 {
2618         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2619
2620         psf = psf->sf_next;
2621         while (!psf) {
2622                 spin_unlock_bh(&state->im->lock);
2623                 state->im = state->im->next;
2624                 while (!state->im) {
2625                         state->dev = next_net_device_rcu(state->dev);
2626                         if (!state->dev) {
2627                                 state->idev = NULL;
2628                                 goto out;
2629                         }
2630                         state->idev = __in_dev_get_rcu(state->dev);
2631                         if (!state->idev)
2632                                 continue;
2633                         state->im = rcu_dereference(state->idev->mc_list);
2634                 }
2635                 if (!state->im)
2636                         break;
2637                 spin_lock_bh(&state->im->lock);
2638                 psf = state->im->sources;
2639         }
2640 out:
2641         return psf;
2642 }
2643
2644 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2645 {
2646         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2647         if (psf)
2648                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2649                         --pos;
2650         return pos ? NULL : psf;
2651 }
2652
2653 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2654         __acquires(rcu)
2655 {
2656         rcu_read_lock();
2657         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2658 }
2659
2660 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2661 {
2662         struct ip_sf_list *psf;
2663         if (v == SEQ_START_TOKEN)
2664                 psf = igmp_mcf_get_first(seq);
2665         else
2666                 psf = igmp_mcf_get_next(seq, v);
2667         ++*pos;
2668         return psf;
2669 }
2670
2671 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2672         __releases(rcu)
2673 {
2674         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2675         if (likely(state->im != NULL)) {
2676                 spin_unlock_bh(&state->im->lock);
2677                 state->im = NULL;
2678         }
2679         state->idev = NULL;
2680         state->dev = NULL;
2681         rcu_read_unlock();
2682 }
2683
2684 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2685 {
2686         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2687         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2688
2689         if (v == SEQ_START_TOKEN) {
2690                 seq_printf(seq,
2691                            "%3s %6s "
2692                            "%10s %10s %6s %6s\n", "Idx",
2693                            "Device", "MCA",
2694                            "SRC", "INC", "EXC");
2695         } else {
2696                 seq_printf(seq,
2697                            "%3d %6.6s 0x%08x "
2698                            "0x%08x %6lu %6lu\n",
2699                            state->dev->ifindex, state->dev->name,
2700                            ntohl(state->im->multiaddr),
2701                            ntohl(psf->sf_inaddr),
2702                            psf->sf_count[MCAST_INCLUDE],
2703                            psf->sf_count[MCAST_EXCLUDE]);
2704         }
2705         return 0;
2706 }
2707
2708 static const struct seq_operations igmp_mcf_seq_ops = {
2709         .start  =       igmp_mcf_seq_start,
2710         .next   =       igmp_mcf_seq_next,
2711         .stop   =       igmp_mcf_seq_stop,
2712         .show   =       igmp_mcf_seq_show,
2713 };
2714
2715 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2716 {
2717         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2718                         sizeof(struct igmp_mcf_iter_state));
2719 }
2720
2721 static const struct file_operations igmp_mcf_seq_fops = {
2722         .owner          =       THIS_MODULE,
2723         .open           =       igmp_mcf_seq_open,
2724         .read           =       seq_read,
2725         .llseek         =       seq_lseek,
2726         .release        =       seq_release_net,
2727 };
2728
2729 static int __net_init igmp_net_init(struct net *net)
2730 {
2731         struct proc_dir_entry *pde;
2732
2733         pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2734         if (!pde)
2735                 goto out_igmp;
2736         pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2737                           &igmp_mcf_seq_fops);
2738         if (!pde)
2739                 goto out_mcfilter;
2740         return 0;
2741
2742 out_mcfilter:
2743         remove_proc_entry("igmp", net->proc_net);
2744 out_igmp:
2745         return -ENOMEM;
2746 }
2747
2748 static void __net_exit igmp_net_exit(struct net *net)
2749 {
2750         remove_proc_entry("mcfilter", net->proc_net);
2751         remove_proc_entry("igmp", net->proc_net);
2752 }
2753
2754 static struct pernet_operations igmp_net_ops = {
2755         .init = igmp_net_init,
2756         .exit = igmp_net_exit,
2757 };
2758 #endif
2759
2760 static int igmp_netdev_event(struct notifier_block *this,
2761                              unsigned long event, void *ptr)
2762 {
2763         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2764         struct in_device *in_dev;
2765
2766         switch (event) {
2767         case NETDEV_RESEND_IGMP:
2768                 in_dev = __in_dev_get_rtnl(dev);
2769                 if (in_dev)
2770                         ip_mc_rejoin_groups(in_dev);
2771                 break;
2772         default:
2773                 break;
2774         }
2775         return NOTIFY_DONE;
2776 }
2777
2778 static struct notifier_block igmp_notifier = {
2779         .notifier_call = igmp_netdev_event,
2780 };
2781
2782 int __init igmp_mc_init(void)
2783 {
2784 #if defined(CONFIG_PROC_FS)
2785         int err;
2786
2787         err = register_pernet_subsys(&igmp_net_ops);
2788         if (err)
2789                 return err;
2790         err = register_netdevice_notifier(&igmp_notifier);
2791         if (err)
2792                 goto reg_notif_fail;
2793         return 0;
2794
2795 reg_notif_fail:
2796         unregister_pernet_subsys(&igmp_net_ops);
2797         return err;
2798 #else
2799         return register_netdevice_notifier(&igmp_notifier);
2800 #endif
2801 }