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  *      Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
  12  *
  13  *      Authors:
  14  *              Alan Cox <Alan.Cox@linux.org>
  15  *
  16  *      This program is free software; you can redistribute it and/or
  17  *      modify it under the terms of the GNU General Public License
  18  *      as published by the Free Software Foundation; either version
  19  *      2 of the License, or (at your option) any later version.
  20  *
  21  *      Fixes:
  22  *
  23  *              Alan Cox        :       Added lots of __inline__ to optimise
  24  *                                      the memory usage of all the tiny little
  25  *                                      functions.
  26  *              Alan Cox        :       Dumped the header building experiment.
  27  *              Alan Cox        :       Minor tweaks ready for multicast routing
  28  *                                      and extended IGMP protocol.
  29  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  30  *                                      writes utterly bogus code otherwise (sigh)
  31  *                                      fixed IGMP loopback to behave in the manner
  32  *                                      desired by mrouted, fixed the fact it has been
  33  *                                      broken since 1.3.6 and cleaned up a few minor
  34  *                                      points.
  35  *
  36  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  37  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  38  *                                      The enhancements are mainly based on Steve Deering's
  39  *                                      ipmulti-3.5 source code.
  40  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  41  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  42  *                                      the mrouted version on that device.
  43  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  44  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  45  *                                      to identify the multicast router version
  46  *                                      and do what the IGMP version 2 specified.
  47  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  48  *              Tsu-Sheng Tsao          if the specified time expired.
  49  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  50  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  51  *              Christian Daudt :       igmp timer wasn't set for local group
  52  *                                      memberships but was being deleted,
  53  *                                      which caused a "del_timer() called
  54  *                                      from %p with timer not initialized\n"
  55  *                                      message (960131).
  56  *              Christian Daudt :       removed del_timer from
  57  *                                      igmp_timer_expire function (960205).
  58  *             Christian Daudt :       igmp_heard_report now only calls
  59  *                                     igmp_timer_expire if tm->running is
  60  *                                     true (960216).
  61  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  62  *                                      igmp_heard_query never trigger. Expiry
  63  *                                      miscalculation fixed in igmp_heard_query
  64  *                                      and random() made to return unsigned to
  65  *                                      prevent negative expiry times.
  66  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  67  *                                      fix from pending 2.1.x patches.
  68  *              Alan Cox:               Forget to enable FDDI support earlier.
  69  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  70  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  71  *              David L Stevens:        IGMPv3 support, with help from
  72  *                                      Vinay Kulkarni
  73  */
  74
  75 #include <linux/module.h>
  76 #include <asm/uaccess.h>
  77 #include <asm/system.h>
  78 #include <linux/types.h>
  79 #include <linux/kernel.h>
  80 #include <linux/jiffies.h>
  81 #include <linux/string.h>
  82 #include <linux/socket.h>
  83 #include <linux/sockios.h>
  84 #include <linux/in.h>
  85 #include <linux/inet.h>
  86 #include <linux/netdevice.h>
  87 #include <linux/skbuff.h>
  88 #include <linux/inetdevice.h>
  89 #include <linux/igmp.h>
  90 #include <linux/if_arp.h>
  91 #include <linux/rtnetlink.h>
  92 #include <linux/times.h>
  93
  94 #include <net/net_namespace.h>
  95 #include <net/arp.h>
  96 #include <net/ip.h>
  97 #include <net/protocol.h>
  98 #include <net/route.h>
  99 #include <net/sock.h>
 100 #include <net/checksum.h>
 101 #include <linux/netfilter_ipv4.h>
 102 #ifdef CONFIG_IP_MROUTE
 103 #include <linux/mroute.h>
 104 #endif
 105 #ifdef CONFIG_PROC_FS
 106 #include <linux/proc_fs.h>
 107 #include <linux/seq_file.h>
 108 #endif
 109
 110 #define IP_MAX_MEMBERSHIPS      20
 111 #define IP_MAX_MSF              10
 112
 113 #ifdef CONFIG_IP_MULTICAST
 114 /* Parameter names and values are taken from igmp-v2-06 draft */
 115
 116 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 117 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 118 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 119 #define IGMP_Query_Response_Interval            (10*HZ)
 120 #define IGMP_Unsolicited_Report_Count           2
 121
 122
 123 #define IGMP_Initial_Report_Delay               (1)
 124
 125 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 126  * IGMP specs require to report membership immediately after
 127  * joining a group, but we delay the first report by a
 128  * small interval. It seems more natural and still does not
 129  * contradict to specs provided this delay is small enough.
 130  */
 131
 132 #define IGMP_V1_SEEN(in_dev) \
 133         (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, 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(in_dev->dev->nd_net, 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 void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 144 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 145 static void igmpv3_clear_delrec(struct in_device *in_dev);
 146 static int sf_setstate(struct ip_mc_list *pmc);
 147 static void sf_markstate(struct ip_mc_list *pmc);
 148 #endif
 149 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 150 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 151                          int sfcount, __be32 *psfsrc, int delta);
 152
 153 static void ip_ma_put(struct ip_mc_list *im)
 154 {
 155         if (atomic_dec_and_test(&im->refcnt)) {
 156                 in_dev_put(im->interface);
 157                 kfree(im);
 158         }
 159 }
 160
 161 #ifdef CONFIG_IP_MULTICAST
 162
 163 /*
 164  *      Timer management
 165  */
 166
 167 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 168 {
 169         spin_lock_bh(&im->lock);
 170         if (del_timer(&im->timer))
 171                 atomic_dec(&im->refcnt);
 172         im->tm_running=0;
 173         im->reporter = 0;
 174         im->unsolicit_count = 0;
 175         spin_unlock_bh(&im->lock);
 176 }
 177
 178 /* It must be called with locked im->lock */
 179 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 180 {
 181         int tv=net_random() % max_delay;
 182
 183         im->tm_running=1;
 184         if (!mod_timer(&im->timer, jiffies+tv+2))
 185                 atomic_inc(&im->refcnt);
 186 }
 187
 188 static void igmp_gq_start_timer(struct in_device *in_dev)
 189 {
 190         int tv = net_random() % in_dev->mr_maxdelay;
 191
 192         in_dev->mr_gq_running = 1;
 193         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 194                 in_dev_hold(in_dev);
 195 }
 196
 197 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 198 {
 199         int tv = net_random() % delay;
 200
 201         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 202                 in_dev_hold(in_dev);
 203 }
 204
 205 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 206 {
 207         spin_lock_bh(&im->lock);
 208         im->unsolicit_count = 0;
 209         if (del_timer(&im->timer)) {
 210                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 211                         add_timer(&im->timer);
 212                         im->tm_running=1;
 213                         spin_unlock_bh(&im->lock);
 214                         return;
 215                 }
 216                 atomic_dec(&im->refcnt);
 217         }
 218         igmp_start_timer(im, max_delay);
 219         spin_unlock_bh(&im->lock);
 220 }
 221
 222
 223 /*
 224  *      Send an IGMP report.
 225  */
 226
 227 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 228
 229
 230 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 231         int gdeleted, int sdeleted)
 232 {
 233         switch (type) {
 234         case IGMPV3_MODE_IS_INCLUDE:
 235         case IGMPV3_MODE_IS_EXCLUDE:
 236                 if (gdeleted || sdeleted)
 237                         return 0;
 238                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 239                         if (pmc->sfmode == MCAST_INCLUDE)
 240                                 return 1;
 241                         /* don't include if this source is excluded
 242                          * in all filters
 243                          */
 244                         if (psf->sf_count[MCAST_INCLUDE])
 245                                 return type == IGMPV3_MODE_IS_INCLUDE;
 246                         return pmc->sfcount[MCAST_EXCLUDE] ==
 247                                 psf->sf_count[MCAST_EXCLUDE];
 248                 }
 249                 return 0;
 250         case IGMPV3_CHANGE_TO_INCLUDE:
 251                 if (gdeleted || sdeleted)
 252                         return 0;
 253                 return psf->sf_count[MCAST_INCLUDE] != 0;
 254         case IGMPV3_CHANGE_TO_EXCLUDE:
 255                 if (gdeleted || sdeleted)
 256                         return 0;
 257                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 258                     psf->sf_count[MCAST_INCLUDE])
 259                         return 0;
 260                 return pmc->sfcount[MCAST_EXCLUDE] ==
 261                         psf->sf_count[MCAST_EXCLUDE];
 262         case IGMPV3_ALLOW_NEW_SOURCES:
 263                 if (gdeleted || !psf->sf_crcount)
 264                         return 0;
 265                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 266         case IGMPV3_BLOCK_OLD_SOURCES:
 267                 if (pmc->sfmode == MCAST_INCLUDE)
 268                         return gdeleted || (psf->sf_crcount && sdeleted);
 269                 return psf->sf_crcount && !gdeleted && !sdeleted;
 270         }
 271         return 0;
 272 }
 273
 274 static int
 275 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 276 {
 277         struct ip_sf_list *psf;
 278         int scount = 0;
 279
 280         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 281                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 282                         continue;
 283                 scount++;
 284         }
 285         return scount;
 286 }
 287
 288 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 289 {
 290         struct sk_buff *skb;
 291         struct rtable *rt;
 292         struct iphdr *pip;
 293         struct igmpv3_report *pig;
 294
 295         skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 296         if (skb == NULL)
 297                 return NULL;
 298
 299         {
 300                 struct flowi fl = { .oif = dev->ifindex,
 301                                     .nl_u = { .ip4_u = {
 302                                     .daddr = IGMPV3_ALL_MCR } },
 303                                     .proto = IPPROTO_IGMP };
 304                 if (ip_route_output_key(&init_net, &rt, &fl)) {
 305                         kfree_skb(skb);
 306                         return NULL;
 307                 }
 308         }
 309         if (rt->rt_src == 0) {
 310                 kfree_skb(skb);
 311                 ip_rt_put(rt);
 312                 return NULL;
 313         }
 314
 315         skb->dst = &rt->u.dst;
 316         skb->dev = dev;
 317
 318         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 319
 320         skb_reset_network_header(skb);
 321         pip = ip_hdr(skb);
 322         skb_put(skb, sizeof(struct iphdr) + 4);
 323
 324         pip->version  = 4;
 325         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 326         pip->tos      = 0xc0;
 327         pip->frag_off = htons(IP_DF);
 328         pip->ttl      = 1;
 329         pip->daddr    = rt->rt_dst;
 330         pip->saddr    = rt->rt_src;
 331         pip->protocol = IPPROTO_IGMP;
 332         pip->tot_len  = 0;      /* filled in later */
 333         ip_select_ident(pip, &rt->u.dst, NULL);
 334         ((u8*)&pip[1])[0] = IPOPT_RA;
 335         ((u8*)&pip[1])[1] = 4;
 336         ((u8*)&pip[1])[2] = 0;
 337         ((u8*)&pip[1])[3] = 0;
 338
 339         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 340         skb_put(skb, sizeof(*pig));
 341         pig = igmpv3_report_hdr(skb);
 342         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 343         pig->resv1 = 0;
 344         pig->csum = 0;
 345         pig->resv2 = 0;
 346         pig->ngrec = 0;
 347         return skb;
 348 }
 349
 350 static int igmpv3_sendpack(struct sk_buff *skb)
 351 {
 352         struct igmphdr *pig = igmp_hdr(skb);
 353         const int igmplen = skb->tail - skb->transport_header;
 354
 355         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 356
 357         return ip_local_out(skb);
 358 }
 359
 360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 361 {
 362         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
 363 }
 364
 365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 366         int type, struct igmpv3_grec **ppgr)
 367 {
 368         struct net_device *dev = pmc->interface->dev;
 369         struct igmpv3_report *pih;
 370         struct igmpv3_grec *pgr;
 371
 372         if (!skb)
 373                 skb = igmpv3_newpack(dev, dev->mtu);
 374         if (!skb)
 375                 return NULL;
 376         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 377         pgr->grec_type = type;
 378         pgr->grec_auxwords = 0;
 379         pgr->grec_nsrcs = 0;
 380         pgr->grec_mca = pmc->multiaddr;
 381         pih = igmpv3_report_hdr(skb);
 382         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 383         *ppgr = pgr;
 384         return skb;
 385 }
 386
 387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 388         skb_tailroom(skb)) : 0)
 389
 390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 391         int type, int gdeleted, int sdeleted)
 392 {
 393         struct net_device *dev = pmc->interface->dev;
 394         struct igmpv3_report *pih;
 395         struct igmpv3_grec *pgr = NULL;
 396         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 397         int scount, stotal, first, isquery, truncate;
 398
 399         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 400                 return skb;
 401
 402         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 403                   type == IGMPV3_MODE_IS_EXCLUDE;
 404         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 405                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 406
 407         stotal = scount = 0;
 408
 409         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 410
 411         if (!*psf_list)
 412                 goto empty_source;
 413
 414         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 415
 416         /* EX and TO_EX get a fresh packet, if needed */
 417         if (truncate) {
 418                 if (pih && pih->ngrec &&
 419                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 420                         if (skb)
 421                                 igmpv3_sendpack(skb);
 422                         skb = igmpv3_newpack(dev, dev->mtu);
 423                 }
 424         }
 425         first = 1;
 426         psf_prev = NULL;
 427         for (psf=*psf_list; psf; psf=psf_next) {
 428                 __be32 *psrc;
 429
 430                 psf_next = psf->sf_next;
 431
 432                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 433                         psf_prev = psf;
 434                         continue;
 435                 }
 436
 437                 /* clear marks on query responses */
 438                 if (isquery)
 439                         psf->sf_gsresp = 0;
 440
 441                 if (AVAILABLE(skb) < sizeof(__be32) +
 442                     first*sizeof(struct igmpv3_grec)) {
 443                         if (truncate && !first)
 444                                 break;   /* truncate these */
 445                         if (pgr)
 446                                 pgr->grec_nsrcs = htons(scount);
 447                         if (skb)
 448                                 igmpv3_sendpack(skb);
 449                         skb = igmpv3_newpack(dev, dev->mtu);
 450                         first = 1;
 451                         scount = 0;
 452                 }
 453                 if (first) {
 454                         skb = add_grhead(skb, pmc, type, &pgr);
 455                         first = 0;
 456                 }
 457                 if (!skb)
 458                         return NULL;
 459                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 460                 *psrc = psf->sf_inaddr;
 461                 scount++; stotal++;
 462                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 463                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 464                         psf->sf_crcount--;
 465                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 466                                 if (psf_prev)
 467                                         psf_prev->sf_next = psf->sf_next;
 468                                 else
 469                                         *psf_list = psf->sf_next;
 470                                 kfree(psf);
 471                                 continue;
 472                         }
 473                 }
 474                 psf_prev = psf;
 475         }
 476
 477 empty_source:
 478         if (!stotal) {
 479                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 480                     type == IGMPV3_BLOCK_OLD_SOURCES)
 481                         return skb;
 482                 if (pmc->crcount || isquery) {
 483                         /* make sure we have room for group header */
 484                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 485                                 igmpv3_sendpack(skb);
 486                                 skb = NULL; /* add_grhead will get a new one */
 487                         }
 488                         skb = add_grhead(skb, pmc, type, &pgr);
 489                 }
 490         }
 491         if (pgr)
 492                 pgr->grec_nsrcs = htons(scount);
 493
 494         if (isquery)
 495                 pmc->gsquery = 0;       /* clear query state on report */
 496         return skb;
 497 }
 498
 499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 500 {
 501         struct sk_buff *skb = NULL;
 502         int type;
 503
 504         if (!pmc) {
 505                 read_lock(&in_dev->mc_list_lock);
 506                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 507                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 508                                 continue;
 509                         spin_lock_bh(&pmc->lock);
 510                         if (pmc->sfcount[MCAST_EXCLUDE])
 511                                 type = IGMPV3_MODE_IS_EXCLUDE;
 512                         else
 513                                 type = IGMPV3_MODE_IS_INCLUDE;
 514                         skb = add_grec(skb, pmc, type, 0, 0);
 515                         spin_unlock_bh(&pmc->lock);
 516                 }
 517                 read_unlock(&in_dev->mc_list_lock);
 518         } else {
 519                 spin_lock_bh(&pmc->lock);
 520                 if (pmc->sfcount[MCAST_EXCLUDE])
 521                         type = IGMPV3_MODE_IS_EXCLUDE;
 522                 else
 523                         type = IGMPV3_MODE_IS_INCLUDE;
 524                 skb = add_grec(skb, pmc, type, 0, 0);
 525                 spin_unlock_bh(&pmc->lock);
 526         }
 527         if (!skb)
 528                 return 0;
 529         return igmpv3_sendpack(skb);
 530 }
 531
 532 /*
 533  * remove zero-count source records from a source filter list
 534  */
 535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 536 {
 537         struct ip_sf_list *psf_prev, *psf_next, *psf;
 538
 539         psf_prev = NULL;
 540         for (psf=*ppsf; psf; psf = psf_next) {
 541                 psf_next = psf->sf_next;
 542                 if (psf->sf_crcount == 0) {
 543                         if (psf_prev)
 544                                 psf_prev->sf_next = psf->sf_next;
 545                         else
 546                                 *ppsf = psf->sf_next;
 547                         kfree(psf);
 548                 } else
 549                         psf_prev = psf;
 550         }
 551 }
 552
 553 static void igmpv3_send_cr(struct in_device *in_dev)
 554 {
 555         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 556         struct sk_buff *skb = NULL;
 557         int type, dtype;
 558
 559         read_lock(&in_dev->mc_list_lock);
 560         spin_lock_bh(&in_dev->mc_tomb_lock);
 561
 562         /* deleted MCA's */
 563         pmc_prev = NULL;
 564         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 565                 pmc_next = pmc->next;
 566                 if (pmc->sfmode == MCAST_INCLUDE) {
 567                         type = IGMPV3_BLOCK_OLD_SOURCES;
 568                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 569                         skb = add_grec(skb, pmc, type, 1, 0);
 570                         skb = add_grec(skb, pmc, dtype, 1, 1);
 571                 }
 572                 if (pmc->crcount) {
 573                         if (pmc->sfmode == MCAST_EXCLUDE) {
 574                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 575                                 skb = add_grec(skb, pmc, type, 1, 0);
 576                         }
 577                         pmc->crcount--;
 578                         if (pmc->crcount == 0) {
 579                                 igmpv3_clear_zeros(&pmc->tomb);
 580                                 igmpv3_clear_zeros(&pmc->sources);
 581                         }
 582                 }
 583                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 584                         if (pmc_prev)
 585                                 pmc_prev->next = pmc_next;
 586                         else
 587                                 in_dev->mc_tomb = pmc_next;
 588                         in_dev_put(pmc->interface);
 589                         kfree(pmc);
 590                 } else
 591                         pmc_prev = pmc;
 592         }
 593         spin_unlock_bh(&in_dev->mc_tomb_lock);
 594
 595         /* change recs */
 596         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 597                 spin_lock_bh(&pmc->lock);
 598                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 599                         type = IGMPV3_BLOCK_OLD_SOURCES;
 600                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 601                 } else {
 602                         type = IGMPV3_ALLOW_NEW_SOURCES;
 603                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 604                 }
 605                 skb = add_grec(skb, pmc, type, 0, 0);
 606                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 607
 608                 /* filter mode changes */
 609                 if (pmc->crcount) {
 610                         if (pmc->sfmode == MCAST_EXCLUDE)
 611                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 612                         else
 613                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 614                         skb = add_grec(skb, pmc, type, 0, 0);
 615                         pmc->crcount--;
 616                 }
 617                 spin_unlock_bh(&pmc->lock);
 618         }
 619         read_unlock(&in_dev->mc_list_lock);
 620
 621         if (!skb)
 622                 return;
 623         (void) igmpv3_sendpack(skb);
 624 }
 625
 626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 627         int type)
 628 {
 629         struct sk_buff *skb;
 630         struct iphdr *iph;
 631         struct igmphdr *ih;
 632         struct rtable *rt;
 633         struct net_device *dev = in_dev->dev;
 634         __be32  group = pmc ? pmc->multiaddr : 0;
 635         __be32  dst;
 636
 637         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 638                 return igmpv3_send_report(in_dev, pmc);
 639         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 640                 dst = IGMP_ALL_ROUTER;
 641         else
 642                 dst = group;
 643
 644         {
 645                 struct flowi fl = { .oif = dev->ifindex,
 646                                     .nl_u = { .ip4_u = { .daddr = dst } },
 647                                     .proto = IPPROTO_IGMP };
 648                 if (ip_route_output_key(&init_net, &rt, &fl))
 649                         return -1;
 650         }
 651         if (rt->rt_src == 0) {
 652                 ip_rt_put(rt);
 653                 return -1;
 654         }
 655
 656         skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 657         if (skb == NULL) {
 658                 ip_rt_put(rt);
 659                 return -1;
 660         }
 661
 662         skb->dst = &rt->u.dst;
 663
 664         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 665
 666         skb_reset_network_header(skb);
 667         iph = ip_hdr(skb);
 668         skb_put(skb, sizeof(struct iphdr) + 4);
 669
 670         iph->version  = 4;
 671         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 672         iph->tos      = 0xc0;
 673         iph->frag_off = htons(IP_DF);
 674         iph->ttl      = 1;
 675         iph->daddr    = dst;
 676         iph->saddr    = rt->rt_src;
 677         iph->protocol = IPPROTO_IGMP;
 678         ip_select_ident(iph, &rt->u.dst, NULL);
 679         ((u8*)&iph[1])[0] = IPOPT_RA;
 680         ((u8*)&iph[1])[1] = 4;
 681         ((u8*)&iph[1])[2] = 0;
 682         ((u8*)&iph[1])[3] = 0;
 683
 684         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 685         ih->type=type;
 686         ih->code=0;
 687         ih->csum=0;
 688         ih->group=group;
 689         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 690
 691         return ip_local_out(skb);
 692 }
 693
 694 static void igmp_gq_timer_expire(unsigned long data)
 695 {
 696         struct in_device *in_dev = (struct in_device *)data;
 697
 698         in_dev->mr_gq_running = 0;
 699         igmpv3_send_report(in_dev, NULL);
 700         __in_dev_put(in_dev);
 701 }
 702
 703 static void igmp_ifc_timer_expire(unsigned long data)
 704 {
 705         struct in_device *in_dev = (struct in_device *)data;
 706
 707         igmpv3_send_cr(in_dev);
 708         if (in_dev->mr_ifc_count) {
 709                 in_dev->mr_ifc_count--;
 710                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 711         }
 712         __in_dev_put(in_dev);
 713 }
 714
 715 static void igmp_ifc_event(struct in_device *in_dev)
 716 {
 717         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 718                 return;
 719         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 720                 IGMP_Unsolicited_Report_Count;
 721         igmp_ifc_start_timer(in_dev, 1);
 722 }
 723
 724
 725 static void igmp_timer_expire(unsigned long data)
 726 {
 727         struct ip_mc_list *im=(struct ip_mc_list *)data;
 728         struct in_device *in_dev = im->interface;
 729
 730         spin_lock(&im->lock);
 731         im->tm_running=0;
 732
 733         if (im->unsolicit_count) {
 734                 im->unsolicit_count--;
 735                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 736         }
 737         im->reporter = 1;
 738         spin_unlock(&im->lock);
 739
 740         if (IGMP_V1_SEEN(in_dev))
 741                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 742         else if (IGMP_V2_SEEN(in_dev))
 743                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 744         else
 745                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 746
 747         ip_ma_put(im);
 748 }
 749
 750 /* mark EXCLUDE-mode sources */
 751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 752 {
 753         struct ip_sf_list *psf;
 754         int i, scount;
 755
 756         scount = 0;
 757         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 758                 if (scount == nsrcs)
 759                         break;
 760                 for (i=0; i<nsrcs; i++) {
 761                         /* skip inactive filters */
 762                         if (pmc->sfcount[MCAST_INCLUDE] ||
 763                             pmc->sfcount[MCAST_EXCLUDE] !=
 764                             psf->sf_count[MCAST_EXCLUDE])
 765                                 continue;
 766                         if (srcs[i] == psf->sf_inaddr) {
 767                                 scount++;
 768                                 break;
 769                         }
 770                 }
 771         }
 772         pmc->gsquery = 0;
 773         if (scount == nsrcs)    /* all sources excluded */
 774                 return 0;
 775         return 1;
 776 }
 777
 778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 779 {
 780         struct ip_sf_list *psf;
 781         int i, scount;
 782
 783         if (pmc->sfmode == MCAST_EXCLUDE)
 784                 return igmp_xmarksources(pmc, nsrcs, srcs);
 785
 786         /* mark INCLUDE-mode sources */
 787         scount = 0;
 788         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 789                 if (scount == nsrcs)
 790                         break;
 791                 for (i=0; i<nsrcs; i++)
 792                         if (srcs[i] == psf->sf_inaddr) {
 793                                 psf->sf_gsresp = 1;
 794                                 scount++;
 795                                 break;
 796                         }
 797         }
 798         if (!scount) {
 799                 pmc->gsquery = 0;
 800                 return 0;
 801         }
 802         pmc->gsquery = 1;
 803         return 1;
 804 }
 805
 806 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 807 {
 808         struct ip_mc_list *im;
 809
 810         /* Timers are only set for non-local groups */
 811
 812         if (group == IGMP_ALL_HOSTS)
 813                 return;
 814
 815         read_lock(&in_dev->mc_list_lock);
 816         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 817                 if (im->multiaddr == group) {
 818                         igmp_stop_timer(im);
 819                         break;
 820                 }
 821         }
 822         read_unlock(&in_dev->mc_list_lock);
 823 }
 824
 825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 826         int len)
 827 {
 828         struct igmphdr          *ih = igmp_hdr(skb);
 829         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 830         struct ip_mc_list       *im;
 831         __be32                  group = ih->group;
 832         int                     max_delay;
 833         int                     mark = 0;
 834
 835
 836         if (len == 8) {
 837                 if (ih->code == 0) {
 838                         /* Alas, old v1 router presents here. */
 839
 840                         max_delay = IGMP_Query_Response_Interval;
 841                         in_dev->mr_v1_seen = jiffies +
 842                                 IGMP_V1_Router_Present_Timeout;
 843                         group = 0;
 844                 } else {
 845                         /* v2 router present */
 846                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 847                         in_dev->mr_v2_seen = jiffies +
 848                                 IGMP_V2_Router_Present_Timeout;
 849                 }
 850                 /* cancel the interface change timer */
 851                 in_dev->mr_ifc_count = 0;
 852                 if (del_timer(&in_dev->mr_ifc_timer))
 853                         __in_dev_put(in_dev);
 854                 /* clear deleted report items */
 855                 igmpv3_clear_delrec(in_dev);
 856         } else if (len < 12) {
 857                 return; /* ignore bogus packet; freed by caller */
 858         } else { /* v3 */
 859                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 860                         return;
 861
 862                 ih3 = igmpv3_query_hdr(skb);
 863                 if (ih3->nsrcs) {
 864                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 865                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 866                                 return;
 867                         ih3 = igmpv3_query_hdr(skb);
 868                 }
 869
 870                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 871                 if (!max_delay)
 872                         max_delay = 1;  /* can't mod w/ 0 */
 873                 in_dev->mr_maxdelay = max_delay;
 874                 if (ih3->qrv)
 875                         in_dev->mr_qrv = ih3->qrv;
 876                 if (!group) { /* general query */
 877                         if (ih3->nsrcs)
 878                                 return; /* no sources allowed */
 879                         igmp_gq_start_timer(in_dev);
 880                         return;
 881                 }
 882                 /* mark sources to include, if group & source-specific */
 883                 mark = ih3->nsrcs != 0;
 884         }
 885
 886         /*
 887          * - Start the timers in all of our membership records
 888          *   that the query applies to for the interface on
 889          *   which the query arrived excl. those that belong
 890          *   to a "local" group (224.0.0.X)
 891          * - For timers already running check if they need to
 892          *   be reset.
 893          * - Use the igmp->igmp_code field as the maximum
 894          *   delay possible
 895          */
 896         read_lock(&in_dev->mc_list_lock);
 897         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 898                 int changed;
 899
 900                 if (group && group != im->multiaddr)
 901                         continue;
 902                 if (im->multiaddr == IGMP_ALL_HOSTS)
 903                         continue;
 904                 spin_lock_bh(&im->lock);
 905                 if (im->tm_running)
 906                         im->gsquery = im->gsquery && mark;
 907                 else
 908                         im->gsquery = mark;
 909                 changed = !im->gsquery ||
 910                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 911                 spin_unlock_bh(&im->lock);
 912                 if (changed)
 913                         igmp_mod_timer(im, max_delay);
 914         }
 915         read_unlock(&in_dev->mc_list_lock);
 916 }
 917
 918 int igmp_rcv(struct sk_buff *skb)
 919 {
 920         /* This basically follows the spec line by line -- see RFC1112 */
 921         struct igmphdr *ih;
 922         struct in_device *in_dev = in_dev_get(skb->dev);
 923         int len = skb->len;
 924
 925         if (in_dev==NULL) {
 926                 kfree_skb(skb);
 927                 return 0;
 928         }
 929
 930         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 931                 goto drop;
 932
 933         switch (skb->ip_summed) {
 934         case CHECKSUM_COMPLETE:
 935                 if (!csum_fold(skb->csum))
 936                         break;
 937                 /* fall through */
 938         case CHECKSUM_NONE:
 939                 skb->csum = 0;
 940                 if (__skb_checksum_complete(skb))
 941                         goto drop;
 942         }
 943
 944         ih = igmp_hdr(skb);
 945         switch (ih->type) {
 946         case IGMP_HOST_MEMBERSHIP_QUERY:
 947                 igmp_heard_query(in_dev, skb, len);
 948                 break;
 949         case IGMP_HOST_MEMBERSHIP_REPORT:
 950         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 951         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 952                 /* Is it our report looped back? */
 953                 if (((struct rtable*)skb->dst)->fl.iif == 0)
 954                         break;
 955                 /* don't rely on MC router hearing unicast reports */
 956                 if (skb->pkt_type == PACKET_MULTICAST ||
 957                     skb->pkt_type == PACKET_BROADCAST)
 958                         igmp_heard_report(in_dev, ih->group);
 959                 break;
 960         case IGMP_PIM:
 961 #ifdef CONFIG_IP_PIMSM_V1
 962                 in_dev_put(in_dev);
 963                 return pim_rcv_v1(skb);
 964 #endif
 965         case IGMP_DVMRP:
 966         case IGMP_TRACE:
 967         case IGMP_HOST_LEAVE_MESSAGE:
 968         case IGMP_MTRACE:
 969         case IGMP_MTRACE_RESP:
 970                 break;
 971         default:
 972                 break;
 973         }
 974
 975 drop:
 976         in_dev_put(in_dev);
 977         kfree_skb(skb);
 978         return 0;
 979 }
 980
 981 #endif
 982
 983
 984 /*
 985  *      Add a filter to a device
 986  */
 987
 988 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 989 {
 990         char buf[MAX_ADDR_LEN];
 991         struct net_device *dev = in_dev->dev;
 992
 993         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 994            We will get multicast token leakage, when IFF_MULTICAST
 995            is changed. This check should be done in dev->set_multicast_list
 996            routine. Something sort of:
 997            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 998            --ANK
 999            */
1000         if (arp_mc_map(addr, buf, dev, 0) == 0)
1001                 dev_mc_add(dev,buf,dev->addr_len,0);
1002 }
1003
1004 /*
1005  *      Remove a filter from a device
1006  */
1007
1008 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1009 {
1010         char buf[MAX_ADDR_LEN];
1011         struct net_device *dev = in_dev->dev;
1012
1013         if (arp_mc_map(addr, buf, dev, 0) == 0)
1014                 dev_mc_delete(dev,buf,dev->addr_len,0);
1015 }
1016
1017 #ifdef CONFIG_IP_MULTICAST
1018 /*
1019  * deleted ip_mc_list manipulation
1020  */
1021 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1022 {
1023         struct ip_mc_list *pmc;
1024
1025         /* this is an "ip_mc_list" for convenience; only the fields below
1026          * are actually used. In particular, the refcnt and users are not
1027          * used for management of the delete list. Using the same structure
1028          * for deleted items allows change reports to use common code with
1029          * non-deleted or query-response MCA's.
1030          */
1031         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1032         if (!pmc)
1033                 return;
1034         spin_lock_bh(&im->lock);
1035         pmc->interface = im->interface;
1036         in_dev_hold(in_dev);
1037         pmc->multiaddr = im->multiaddr;
1038         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1039                 IGMP_Unsolicited_Report_Count;
1040         pmc->sfmode = im->sfmode;
1041         if (pmc->sfmode == MCAST_INCLUDE) {
1042                 struct ip_sf_list *psf;
1043
1044                 pmc->tomb = im->tomb;
1045                 pmc->sources = im->sources;
1046                 im->tomb = im->sources = NULL;
1047                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1048                         psf->sf_crcount = pmc->crcount;
1049         }
1050         spin_unlock_bh(&im->lock);
1051
1052         spin_lock_bh(&in_dev->mc_tomb_lock);
1053         pmc->next = in_dev->mc_tomb;
1054         in_dev->mc_tomb = pmc;
1055         spin_unlock_bh(&in_dev->mc_tomb_lock);
1056 }
1057
1058 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1059 {
1060         struct ip_mc_list *pmc, *pmc_prev;
1061         struct ip_sf_list *psf, *psf_next;
1062
1063         spin_lock_bh(&in_dev->mc_tomb_lock);
1064         pmc_prev = NULL;
1065         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1066                 if (pmc->multiaddr == multiaddr)
1067                         break;
1068                 pmc_prev = pmc;
1069         }
1070         if (pmc) {
1071                 if (pmc_prev)
1072                         pmc_prev->next = pmc->next;
1073                 else
1074                         in_dev->mc_tomb = pmc->next;
1075         }
1076         spin_unlock_bh(&in_dev->mc_tomb_lock);
1077         if (pmc) {
1078                 for (psf=pmc->tomb; psf; psf=psf_next) {
1079                         psf_next = psf->sf_next;
1080                         kfree(psf);
1081                 }
1082                 in_dev_put(pmc->interface);
1083                 kfree(pmc);
1084         }
1085 }
1086
1087 static void igmpv3_clear_delrec(struct in_device *in_dev)
1088 {
1089         struct ip_mc_list *pmc, *nextpmc;
1090
1091         spin_lock_bh(&in_dev->mc_tomb_lock);
1092         pmc = in_dev->mc_tomb;
1093         in_dev->mc_tomb = NULL;
1094         spin_unlock_bh(&in_dev->mc_tomb_lock);
1095
1096         for (; pmc; pmc = nextpmc) {
1097                 nextpmc = pmc->next;
1098                 ip_mc_clear_src(pmc);
1099                 in_dev_put(pmc->interface);
1100                 kfree(pmc);
1101         }
1102         /* clear dead sources, too */
1103         read_lock(&in_dev->mc_list_lock);
1104         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1105                 struct ip_sf_list *psf, *psf_next;
1106
1107                 spin_lock_bh(&pmc->lock);
1108                 psf = pmc->tomb;
1109                 pmc->tomb = NULL;
1110                 spin_unlock_bh(&pmc->lock);
1111                 for (; psf; psf=psf_next) {
1112                         psf_next = psf->sf_next;
1113                         kfree(psf);
1114                 }
1115         }
1116         read_unlock(&in_dev->mc_list_lock);
1117 }
1118 #endif
1119
1120 static void igmp_group_dropped(struct ip_mc_list *im)
1121 {
1122         struct in_device *in_dev = im->interface;
1123 #ifdef CONFIG_IP_MULTICAST
1124         int reporter;
1125 #endif
1126
1127         if (im->loaded) {
1128                 im->loaded = 0;
1129                 ip_mc_filter_del(in_dev, im->multiaddr);
1130         }
1131
1132 #ifdef CONFIG_IP_MULTICAST
1133         if (im->multiaddr == IGMP_ALL_HOSTS)
1134                 return;
1135
1136         reporter = im->reporter;
1137         igmp_stop_timer(im);
1138
1139         if (!in_dev->dead) {
1140                 if (IGMP_V1_SEEN(in_dev))
1141                         goto done;
1142                 if (IGMP_V2_SEEN(in_dev)) {
1143                         if (reporter)
1144                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1145                         goto done;
1146                 }
1147                 /* IGMPv3 */
1148                 igmpv3_add_delrec(in_dev, im);
1149
1150                 igmp_ifc_event(in_dev);
1151         }
1152 done:
1153 #endif
1154         ip_mc_clear_src(im);
1155 }
1156
1157 static void igmp_group_added(struct ip_mc_list *im)
1158 {
1159         struct in_device *in_dev = im->interface;
1160
1161         if (im->loaded == 0) {
1162                 im->loaded = 1;
1163                 ip_mc_filter_add(in_dev, im->multiaddr);
1164         }
1165
1166 #ifdef CONFIG_IP_MULTICAST
1167         if (im->multiaddr == IGMP_ALL_HOSTS)
1168                 return;
1169
1170         if (in_dev->dead)
1171                 return;
1172         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1173                 spin_lock_bh(&im->lock);
1174                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1175                 spin_unlock_bh(&im->lock);
1176                 return;
1177         }
1178         /* else, v3 */
1179
1180         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1181                 IGMP_Unsolicited_Report_Count;
1182         igmp_ifc_event(in_dev);
1183 #endif
1184 }
1185
1186
1187 /*
1188  *      Multicast list managers
1189  */
1190
1191
1192 /*
1193  *      A socket has joined a multicast group on device dev.
1194  */
1195
1196 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1197 {
1198         struct ip_mc_list *im;
1199
1200         ASSERT_RTNL();
1201
1202         for (im=in_dev->mc_list; im; im=im->next) {
1203                 if (im->multiaddr == addr) {
1204                         im->users++;
1205                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1206                         goto out;
1207                 }
1208         }
1209
1210         im = kmalloc(sizeof(*im), GFP_KERNEL);
1211         if (!im)
1212                 goto out;
1213
1214         im->users=1;
1215         im->interface=in_dev;
1216         in_dev_hold(in_dev);
1217         im->multiaddr=addr;
1218         /* initial mode is (EX, empty) */
1219         im->sfmode = MCAST_EXCLUDE;
1220         im->sfcount[MCAST_INCLUDE] = 0;
1221         im->sfcount[MCAST_EXCLUDE] = 1;
1222         im->sources = NULL;
1223         im->tomb = NULL;
1224         im->crcount = 0;
1225         atomic_set(&im->refcnt, 1);
1226         spin_lock_init(&im->lock);
1227 #ifdef CONFIG_IP_MULTICAST
1228         im->tm_running=0;
1229         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1230         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1231         im->reporter = 0;
1232         im->gsquery = 0;
1233 #endif
1234         im->loaded = 0;
1235         write_lock_bh(&in_dev->mc_list_lock);
1236         im->next=in_dev->mc_list;
1237         in_dev->mc_list=im;
1238         write_unlock_bh(&in_dev->mc_list_lock);
1239 #ifdef CONFIG_IP_MULTICAST
1240         igmpv3_del_delrec(in_dev, im->multiaddr);
1241 #endif
1242         igmp_group_added(im);
1243         if (!in_dev->dead)
1244                 ip_rt_multicast_event(in_dev);
1245 out:
1246         return;
1247 }
1248
1249 /*
1250  *      Resend IGMP JOIN report; used for bonding.
1251  */
1252 void ip_mc_rejoin_group(struct ip_mc_list *im)
1253 {
1254 #ifdef CONFIG_IP_MULTICAST
1255         struct in_device *in_dev = im->interface;
1256
1257         if (im->multiaddr == IGMP_ALL_HOSTS)
1258                 return;
1259
1260         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1261                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1262                 return;
1263         }
1264         /* else, v3 */
1265         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1266                 IGMP_Unsolicited_Report_Count;
1267         igmp_ifc_event(in_dev);
1268 #endif
1269 }
1270
1271 /*
1272  *      A socket has left a multicast group on device dev
1273  */
1274
1275 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1276 {
1277         struct ip_mc_list *i, **ip;
1278
1279         ASSERT_RTNL();
1280
1281         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1282                 if (i->multiaddr==addr) {
1283                         if (--i->users == 0) {
1284                                 write_lock_bh(&in_dev->mc_list_lock);
1285                                 *ip = i->next;
1286                                 write_unlock_bh(&in_dev->mc_list_lock);
1287                                 igmp_group_dropped(i);
1288
1289                                 if (!in_dev->dead)
1290                                         ip_rt_multicast_event(in_dev);
1291
1292                                 ip_ma_put(i);
1293                                 return;
1294                         }
1295                         break;
1296                 }
1297         }
1298 }
1299
1300 /* Device going down */
1301
1302 void ip_mc_down(struct in_device *in_dev)
1303 {
1304         struct ip_mc_list *i;
1305
1306         ASSERT_RTNL();
1307
1308         for (i=in_dev->mc_list; i; i=i->next)
1309                 igmp_group_dropped(i);
1310
1311 #ifdef CONFIG_IP_MULTICAST
1312         in_dev->mr_ifc_count = 0;
1313         if (del_timer(&in_dev->mr_ifc_timer))
1314                 __in_dev_put(in_dev);
1315         in_dev->mr_gq_running = 0;
1316         if (del_timer(&in_dev->mr_gq_timer))
1317                 __in_dev_put(in_dev);
1318         igmpv3_clear_delrec(in_dev);
1319 #endif
1320
1321         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1322 }
1323
1324 void ip_mc_init_dev(struct in_device *in_dev)
1325 {
1326         ASSERT_RTNL();
1327
1328         in_dev->mc_tomb = NULL;
1329 #ifdef CONFIG_IP_MULTICAST
1330         in_dev->mr_gq_running = 0;
1331         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1332                         (unsigned long)in_dev);
1333         in_dev->mr_ifc_count = 0;
1334         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1335                         (unsigned long)in_dev);
1336         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1337 #endif
1338
1339         rwlock_init(&in_dev->mc_list_lock);
1340         spin_lock_init(&in_dev->mc_tomb_lock);
1341 }
1342
1343 /* Device going up */
1344
1345 void ip_mc_up(struct in_device *in_dev)
1346 {
1347         struct ip_mc_list *i;
1348
1349         ASSERT_RTNL();
1350
1351         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1352
1353         for (i=in_dev->mc_list; i; i=i->next)
1354                 igmp_group_added(i);
1355 }
1356
1357 /*
1358  *      Device is about to be destroyed: clean up.
1359  */
1360
1361 void ip_mc_destroy_dev(struct in_device *in_dev)
1362 {
1363         struct ip_mc_list *i;
1364
1365         ASSERT_RTNL();
1366
1367         /* Deactivate timers */
1368         ip_mc_down(in_dev);
1369
1370         write_lock_bh(&in_dev->mc_list_lock);
1371         while ((i = in_dev->mc_list) != NULL) {
1372                 in_dev->mc_list = i->next;
1373                 write_unlock_bh(&in_dev->mc_list_lock);
1374
1375                 igmp_group_dropped(i);
1376                 ip_ma_put(i);
1377
1378                 write_lock_bh(&in_dev->mc_list_lock);
1379         }
1380         write_unlock_bh(&in_dev->mc_list_lock);
1381 }
1382
1383 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1384 {
1385         struct flowi fl = { .nl_u = { .ip4_u =
1386                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1387         struct rtable *rt;
1388         struct net_device *dev = NULL;
1389         struct in_device *idev = NULL;
1390
1391         if (imr->imr_ifindex) {
1392                 idev = inetdev_by_index(&init_net, imr->imr_ifindex);
1393                 if (idev)
1394                         __in_dev_put(idev);
1395                 return idev;
1396         }
1397         if (imr->imr_address.s_addr) {
1398                 dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
1399                 if (!dev)
1400                         return NULL;
1401                 dev_put(dev);
1402         }
1403
1404         if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) {
1405                 dev = rt->u.dst.dev;
1406                 ip_rt_put(rt);
1407         }
1408         if (dev) {
1409                 imr->imr_ifindex = dev->ifindex;
1410                 idev = __in_dev_get_rtnl(dev);
1411         }
1412         return idev;
1413 }
1414
1415 /*
1416  *      Join a socket to a group
1417  */
1418 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1419 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1420
1421
1422 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1423         __be32 *psfsrc)
1424 {
1425         struct ip_sf_list *psf, *psf_prev;
1426         int rv = 0;
1427
1428         psf_prev = NULL;
1429         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1430                 if (psf->sf_inaddr == *psfsrc)
1431                         break;
1432                 psf_prev = psf;
1433         }
1434         if (!psf || psf->sf_count[sfmode] == 0) {
1435                 /* source filter not found, or count wrong =>  bug */
1436                 return -ESRCH;
1437         }
1438         psf->sf_count[sfmode]--;
1439         if (psf->sf_count[sfmode] == 0) {
1440                 ip_rt_multicast_event(pmc->interface);
1441         }
1442         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1443 #ifdef CONFIG_IP_MULTICAST
1444                 struct in_device *in_dev = pmc->interface;
1445 #endif
1446
1447                 /* no more filters for this source */
1448                 if (psf_prev)
1449                         psf_prev->sf_next = psf->sf_next;
1450                 else
1451                         pmc->sources = psf->sf_next;
1452 #ifdef CONFIG_IP_MULTICAST
1453                 if (psf->sf_oldin &&
1454                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1455                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1456                                 IGMP_Unsolicited_Report_Count;
1457                         psf->sf_next = pmc->tomb;
1458                         pmc->tomb = psf;
1459                         rv = 1;
1460                 } else
1461 #endif
1462                         kfree(psf);
1463         }
1464         return rv;
1465 }
1466
1467 #ifndef CONFIG_IP_MULTICAST
1468 #define igmp_ifc_event(x)       do { } while (0)
1469 #endif
1470
1471 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1472                          int sfcount, __be32 *psfsrc, int delta)
1473 {
1474         struct ip_mc_list *pmc;
1475         int     changerec = 0;
1476         int     i, err;
1477
1478         if (!in_dev)
1479                 return -ENODEV;
1480         read_lock(&in_dev->mc_list_lock);
1481         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1482                 if (*pmca == pmc->multiaddr)
1483                         break;
1484         }
1485         if (!pmc) {
1486                 /* MCA not found?? bug */
1487                 read_unlock(&in_dev->mc_list_lock);
1488                 return -ESRCH;
1489         }
1490         spin_lock_bh(&pmc->lock);
1491         read_unlock(&in_dev->mc_list_lock);
1492 #ifdef CONFIG_IP_MULTICAST
1493         sf_markstate(pmc);
1494 #endif
1495         if (!delta) {
1496                 err = -EINVAL;
1497                 if (!pmc->sfcount[sfmode])
1498                         goto out_unlock;
1499                 pmc->sfcount[sfmode]--;
1500         }
1501         err = 0;
1502         for (i=0; i<sfcount; i++) {
1503                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1504
1505                 changerec |= rv > 0;
1506                 if (!err && rv < 0)
1507                         err = rv;
1508         }
1509         if (pmc->sfmode == MCAST_EXCLUDE &&
1510             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1511             pmc->sfcount[MCAST_INCLUDE]) {
1512 #ifdef CONFIG_IP_MULTICAST
1513                 struct ip_sf_list *psf;
1514 #endif
1515
1516                 /* filter mode change */
1517                 pmc->sfmode = MCAST_INCLUDE;
1518 #ifdef CONFIG_IP_MULTICAST
1519                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1520                         IGMP_Unsolicited_Report_Count;
1521                 in_dev->mr_ifc_count = pmc->crcount;
1522                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1523                         psf->sf_crcount = 0;
1524                 igmp_ifc_event(pmc->interface);
1525         } else if (sf_setstate(pmc) || changerec) {
1526                 igmp_ifc_event(pmc->interface);
1527 #endif
1528         }
1529 out_unlock:
1530         spin_unlock_bh(&pmc->lock);
1531         return err;
1532 }
1533
1534 /*
1535  * Add multicast single-source filter to the interface list
1536  */
1537 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1538         __be32 *psfsrc, int delta)
1539 {
1540         struct ip_sf_list *psf, *psf_prev;
1541
1542         psf_prev = NULL;
1543         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1544                 if (psf->sf_inaddr == *psfsrc)
1545                         break;
1546                 psf_prev = psf;
1547         }
1548         if (!psf) {
1549                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1550                 if (!psf)
1551                         return -ENOBUFS;
1552                 psf->sf_inaddr = *psfsrc;
1553                 if (psf_prev) {
1554                         psf_prev->sf_next = psf;
1555                 } else
1556                         pmc->sources = psf;
1557         }
1558         psf->sf_count[sfmode]++;
1559         if (psf->sf_count[sfmode] == 1) {
1560                 ip_rt_multicast_event(pmc->interface);
1561         }
1562         return 0;
1563 }
1564
1565 #ifdef CONFIG_IP_MULTICAST
1566 static void sf_markstate(struct ip_mc_list *pmc)
1567 {
1568         struct ip_sf_list *psf;
1569         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1570
1571         for (psf=pmc->sources; psf; psf=psf->sf_next)
1572                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1573                         psf->sf_oldin = mca_xcount ==
1574                                 psf->sf_count[MCAST_EXCLUDE] &&
1575                                 !psf->sf_count[MCAST_INCLUDE];
1576                 } else
1577                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1578 }
1579
1580 static int sf_setstate(struct ip_mc_list *pmc)
1581 {
1582         struct ip_sf_list *psf, *dpsf;
1583         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1584         int qrv = pmc->interface->mr_qrv;
1585         int new_in, rv;
1586
1587         rv = 0;
1588         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1589                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1590                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1591                                 !psf->sf_count[MCAST_INCLUDE];
1592                 } else
1593                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1594                 if (new_in) {
1595                         if (!psf->sf_oldin) {
1596                                 struct ip_sf_list *prev = NULL;
1597
1598                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1599                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1600                                                 break;
1601                                         prev = dpsf;
1602                                 }
1603                                 if (dpsf) {
1604                                         if (prev)
1605                                                 prev->sf_next = dpsf->sf_next;
1606                                         else
1607                                                 pmc->tomb = dpsf->sf_next;
1608                                         kfree(dpsf);
1609                                 }
1610                                 psf->sf_crcount = qrv;
1611                                 rv++;
1612                         }
1613                 } else if (psf->sf_oldin) {
1614
1615                         psf->sf_crcount = 0;
1616                         /*
1617                          * add or update "delete" records if an active filter
1618                          * is now inactive
1619                          */
1620                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1621                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1622                                         break;
1623                         if (!dpsf) {
1624                                 dpsf = (struct ip_sf_list *)
1625                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1626                                 if (!dpsf)
1627                                         continue;
1628                                 *dpsf = *psf;
1629                                 /* pmc->lock held by callers */
1630                                 dpsf->sf_next = pmc->tomb;
1631                                 pmc->tomb = dpsf;
1632                         }
1633                         dpsf->sf_crcount = qrv;
1634                         rv++;
1635                 }
1636         }
1637         return rv;
1638 }
1639 #endif
1640
1641 /*
1642  * Add multicast source filter list to the interface list
1643  */
1644 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1645                          int sfcount, __be32 *psfsrc, int delta)
1646 {
1647         struct ip_mc_list *pmc;
1648         int     isexclude;
1649         int     i, err;
1650
1651         if (!in_dev)
1652                 return -ENODEV;
1653         read_lock(&in_dev->mc_list_lock);
1654         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1655                 if (*pmca == pmc->multiaddr)
1656                         break;
1657         }
1658         if (!pmc) {
1659                 /* MCA not found?? bug */
1660                 read_unlock(&in_dev->mc_list_lock);
1661                 return -ESRCH;
1662         }
1663         spin_lock_bh(&pmc->lock);
1664         read_unlock(&in_dev->mc_list_lock);
1665
1666 #ifdef CONFIG_IP_MULTICAST
1667         sf_markstate(pmc);
1668 #endif
1669         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1670         if (!delta)
1671                 pmc->sfcount[sfmode]++;
1672         err = 0;
1673         for (i=0; i<sfcount; i++) {
1674                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1675                 if (err)
1676                         break;
1677         }
1678         if (err) {
1679                 int j;
1680
1681                 pmc->sfcount[sfmode]--;
1682                 for (j=0; j<i; j++)
1683                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1684         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1685 #ifdef CONFIG_IP_MULTICAST
1686                 struct ip_sf_list *psf;
1687                 in_dev = pmc->interface;
1688 #endif
1689
1690                 /* filter mode change */
1691                 if (pmc->sfcount[MCAST_EXCLUDE])
1692                         pmc->sfmode = MCAST_EXCLUDE;
1693                 else if (pmc->sfcount[MCAST_INCLUDE])
1694                         pmc->sfmode = MCAST_INCLUDE;
1695 #ifdef CONFIG_IP_MULTICAST
1696                 /* else no filters; keep old mode for reports */
1697
1698                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1699                         IGMP_Unsolicited_Report_Count;
1700                 in_dev->mr_ifc_count = pmc->crcount;
1701                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1702                         psf->sf_crcount = 0;
1703                 igmp_ifc_event(in_dev);
1704         } else if (sf_setstate(pmc)) {
1705                 igmp_ifc_event(in_dev);
1706 #endif
1707         }
1708         spin_unlock_bh(&pmc->lock);
1709         return err;
1710 }
1711
1712 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1713 {
1714         struct ip_sf_list *psf, *nextpsf;
1715
1716         for (psf=pmc->tomb; psf; psf=nextpsf) {
1717                 nextpsf = psf->sf_next;
1718                 kfree(psf);
1719         }
1720         pmc->tomb = NULL;
1721         for (psf=pmc->sources; psf; psf=nextpsf) {
1722                 nextpsf = psf->sf_next;
1723                 kfree(psf);
1724         }
1725         pmc->sources = NULL;
1726         pmc->sfmode = MCAST_EXCLUDE;
1727         pmc->sfcount[MCAST_INCLUDE] = 0;
1728         pmc->sfcount[MCAST_EXCLUDE] = 1;
1729 }
1730
1731
1732 /*
1733  * Join a multicast group
1734  */
1735 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1736 {
1737         int err;
1738         __be32 addr = imr->imr_multiaddr.s_addr;
1739         struct ip_mc_socklist *iml=NULL, *i;
1740         struct in_device *in_dev;
1741         struct inet_sock *inet = inet_sk(sk);
1742         int ifindex;
1743         int count = 0;
1744
1745         if (!ipv4_is_multicast(addr))
1746                 return -EINVAL;
1747
1748         rtnl_lock();
1749
1750         in_dev = ip_mc_find_dev(imr);
1751
1752         if (!in_dev) {
1753                 iml = NULL;
1754                 err = -ENODEV;
1755                 goto done;
1756         }
1757
1758         err = -EADDRINUSE;
1759         ifindex = imr->imr_ifindex;
1760         for (i = inet->mc_list; i; i = i->next) {
1761                 if (i->multi.imr_multiaddr.s_addr == addr &&
1762                     i->multi.imr_ifindex == ifindex)
1763                         goto done;
1764                 count++;
1765         }
1766         err = -ENOBUFS;
1767         if (count >= sysctl_igmp_max_memberships)
1768                 goto done;
1769         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1770         if (iml == NULL)
1771                 goto done;
1772
1773         memcpy(&iml->multi, imr, sizeof(*imr));
1774         iml->next = inet->mc_list;
1775         iml->sflist = NULL;
1776         iml->sfmode = MCAST_EXCLUDE;
1777         inet->mc_list = iml;
1778         ip_mc_inc_group(in_dev, addr);
1779         err = 0;
1780 done:
1781         rtnl_unlock();
1782         return err;
1783 }
1784
1785 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1786                            struct in_device *in_dev)
1787 {
1788         int err;
1789
1790         if (iml->sflist == NULL) {
1791                 /* any-source empty exclude case */
1792                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1793                         iml->sfmode, 0, NULL, 0);
1794         }
1795         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1796                         iml->sfmode, iml->sflist->sl_count,
1797                         iml->sflist->sl_addr, 0);
1798         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1799         iml->sflist = NULL;
1800         return err;
1801 }
1802
1803 /*
1804  *      Ask a socket to leave a group.
1805  */
1806
1807 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1808 {
1809         struct inet_sock *inet = inet_sk(sk);
1810         struct ip_mc_socklist *iml, **imlp;
1811         struct in_device *in_dev;
1812         __be32 group = imr->imr_multiaddr.s_addr;
1813         u32 ifindex;
1814         int ret = -EADDRNOTAVAIL;
1815
1816         rtnl_lock();
1817         in_dev = ip_mc_find_dev(imr);
1818         ifindex = imr->imr_ifindex;
1819         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1820                 if (iml->multi.imr_multiaddr.s_addr != group)
1821                         continue;
1822                 if (ifindex) {
1823                         if (iml->multi.imr_ifindex != ifindex)
1824                                 continue;
1825                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1826                                 iml->multi.imr_address.s_addr)
1827                         continue;
1828
1829                 (void) ip_mc_leave_src(sk, iml, in_dev);
1830
1831                 *imlp = iml->next;
1832
1833                 if (in_dev)
1834                         ip_mc_dec_group(in_dev, group);
1835                 rtnl_unlock();
1836                 sock_kfree_s(sk, iml, sizeof(*iml));
1837                 return 0;
1838         }
1839         if (!in_dev)
1840                 ret = -ENODEV;
1841         rtnl_unlock();
1842         return ret;
1843 }
1844
1845 int ip_mc_source(int add, int omode, struct sock *sk, struct
1846         ip_mreq_source *mreqs, int ifindex)
1847 {
1848         int err;
1849         struct ip_mreqn imr;
1850         __be32 addr = mreqs->imr_multiaddr;
1851         struct ip_mc_socklist *pmc;
1852         struct in_device *in_dev = NULL;
1853         struct inet_sock *inet = inet_sk(sk);
1854         struct ip_sf_socklist *psl;
1855         int leavegroup = 0;
1856         int i, j, rv;
1857
1858         if (!ipv4_is_multicast(addr))
1859                 return -EINVAL;
1860
1861         rtnl_lock();
1862
1863         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1864         imr.imr_address.s_addr = mreqs->imr_interface;
1865         imr.imr_ifindex = ifindex;
1866         in_dev = ip_mc_find_dev(&imr);
1867
1868         if (!in_dev) {
1869                 err = -ENODEV;
1870                 goto done;
1871         }
1872         err = -EADDRNOTAVAIL;
1873
1874         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1875                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1876                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1877                         break;
1878         }
1879         if (!pmc) {             /* must have a prior join */
1880                 err = -EINVAL;
1881                 goto done;
1882         }
1883         /* if a source filter was set, must be the same mode as before */
1884         if (pmc->sflist) {
1885                 if (pmc->sfmode != omode) {
1886                         err = -EINVAL;
1887                         goto done;
1888                 }
1889         } else if (pmc->sfmode != omode) {
1890                 /* allow mode switches for empty-set filters */
1891                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1892                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1893                         NULL, 0);
1894                 pmc->sfmode = omode;
1895         }
1896
1897         psl = pmc->sflist;
1898         if (!add) {
1899                 if (!psl)
1900                         goto done;      /* err = -EADDRNOTAVAIL */
1901                 rv = !0;
1902                 for (i=0; i<psl->sl_count; i++) {
1903                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1904                                 sizeof(__be32));
1905                         if (rv == 0)
1906                                 break;
1907                 }
1908                 if (rv)         /* source not found */
1909                         goto done;      /* err = -EADDRNOTAVAIL */
1910
1911                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1912                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1913                         leavegroup = 1;
1914                         goto done;
1915                 }
1916
1917                 /* update the interface filter */
1918                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1919                         &mreqs->imr_sourceaddr, 1);
1920
1921                 for (j=i+1; j<psl->sl_count; j++)
1922                         psl->sl_addr[j-1] = psl->sl_addr[j];
1923                 psl->sl_count--;
1924                 err = 0;
1925                 goto done;
1926         }
1927         /* else, add a new source to the filter */
1928
1929         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1930                 err = -ENOBUFS;
1931                 goto done;
1932         }
1933         if (!psl || psl->sl_count == psl->sl_max) {
1934                 struct ip_sf_socklist *newpsl;
1935                 int count = IP_SFBLOCK;
1936
1937                 if (psl)
1938                         count += psl->sl_max;
1939                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1940                 if (!newpsl) {
1941                         err = -ENOBUFS;
1942                         goto done;
1943                 }
1944                 newpsl->sl_max = count;
1945                 newpsl->sl_count = count - IP_SFBLOCK;
1946                 if (psl) {
1947                         for (i=0; i<psl->sl_count; i++)
1948                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1949                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1950                 }
1951                 pmc->sflist = psl = newpsl;
1952         }
1953         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1954         for (i=0; i<psl->sl_count; i++) {
1955                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1956                         sizeof(__be32));
1957                 if (rv == 0)
1958                         break;
1959         }
1960         if (rv == 0)            /* address already there is an error */
1961                 goto done;
1962         for (j=psl->sl_count-1; j>=i; j--)
1963                 psl->sl_addr[j+1] = psl->sl_addr[j];
1964         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1965         psl->sl_count++;
1966         err = 0;
1967         /* update the interface list */
1968         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1969                 &mreqs->imr_sourceaddr, 1);
1970 done:
1971         rtnl_unlock();
1972         if (leavegroup)
1973                 return ip_mc_leave_group(sk, &imr);
1974         return err;
1975 }
1976
1977 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1978 {
1979         int err = 0;
1980         struct ip_mreqn imr;
1981         __be32 addr = msf->imsf_multiaddr;
1982         struct ip_mc_socklist *pmc;
1983         struct in_device *in_dev;
1984         struct inet_sock *inet = inet_sk(sk);
1985         struct ip_sf_socklist *newpsl, *psl;
1986         int leavegroup = 0;
1987
1988         if (!ipv4_is_multicast(addr))
1989                 return -EINVAL;
1990         if (msf->imsf_fmode != MCAST_INCLUDE &&
1991             msf->imsf_fmode != MCAST_EXCLUDE)
1992                 return -EINVAL;
1993
1994         rtnl_lock();
1995
1996         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1997         imr.imr_address.s_addr = msf->imsf_interface;
1998         imr.imr_ifindex = ifindex;
1999         in_dev = ip_mc_find_dev(&imr);
2000
2001         if (!in_dev) {
2002                 err = -ENODEV;
2003                 goto done;
2004         }
2005
2006         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2007         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2008                 leavegroup = 1;
2009                 goto done;
2010         }
2011
2012         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2013                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2014                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2015                         break;
2016         }
2017         if (!pmc) {             /* must have a prior join */
2018                 err = -EINVAL;
2019                 goto done;
2020         }
2021         if (msf->imsf_numsrc) {
2022                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2023                                                            GFP_KERNEL);
2024                 if (!newpsl) {
2025                         err = -ENOBUFS;
2026                         goto done;
2027                 }
2028                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2029                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2030                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2031                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2032                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2033                 if (err) {
2034                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2035                         goto done;
2036                 }
2037         } else {
2038                 newpsl = NULL;
2039                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2040                                      msf->imsf_fmode, 0, NULL, 0);
2041         }
2042         psl = pmc->sflist;
2043         if (psl) {
2044                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2045                         psl->sl_count, psl->sl_addr, 0);
2046                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2047         } else
2048                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2049                         0, NULL, 0);
2050         pmc->sflist = newpsl;
2051         pmc->sfmode = msf->imsf_fmode;
2052         err = 0;
2053 done:
2054         rtnl_unlock();
2055         if (leavegroup)
2056                 err = ip_mc_leave_group(sk, &imr);
2057         return err;
2058 }
2059
2060 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2061         struct ip_msfilter __user *optval, int __user *optlen)
2062 {
2063         int err, len, count, copycount;
2064         struct ip_mreqn imr;
2065         __be32 addr = msf->imsf_multiaddr;
2066         struct ip_mc_socklist *pmc;
2067         struct in_device *in_dev;
2068         struct inet_sock *inet = inet_sk(sk);
2069         struct ip_sf_socklist *psl;
2070
2071         if (!ipv4_is_multicast(addr))
2072                 return -EINVAL;
2073
2074         rtnl_lock();
2075
2076         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2077         imr.imr_address.s_addr = msf->imsf_interface;
2078         imr.imr_ifindex = 0;
2079         in_dev = ip_mc_find_dev(&imr);
2080
2081         if (!in_dev) {
2082                 err = -ENODEV;
2083                 goto done;
2084         }
2085         err = -EADDRNOTAVAIL;
2086
2087         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2088                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2089                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2090                         break;
2091         }
2092         if (!pmc)               /* must have a prior join */
2093                 goto done;
2094         msf->imsf_fmode = pmc->sfmode;
2095         psl = pmc->sflist;
2096         rtnl_unlock();
2097         if (!psl) {
2098                 len = 0;
2099                 count = 0;
2100         } else {
2101                 count = psl->sl_count;
2102         }
2103         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2104         len = copycount * sizeof(psl->sl_addr[0]);
2105         msf->imsf_numsrc = count;
2106         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2107             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2108                 return -EFAULT;
2109         }
2110         if (len &&
2111             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2112                 return -EFAULT;
2113         return 0;
2114 done:
2115         rtnl_unlock();
2116         return err;
2117 }
2118
2119 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2120         struct group_filter __user *optval, int __user *optlen)
2121 {
2122         int err, i, count, copycount;
2123         struct sockaddr_in *psin;
2124         __be32 addr;
2125         struct ip_mc_socklist *pmc;
2126         struct inet_sock *inet = inet_sk(sk);
2127         struct ip_sf_socklist *psl;
2128
2129         psin = (struct sockaddr_in *)&gsf->gf_group;
2130         if (psin->sin_family != AF_INET)
2131                 return -EINVAL;
2132         addr = psin->sin_addr.s_addr;
2133         if (!ipv4_is_multicast(addr))
2134                 return -EINVAL;
2135
2136         rtnl_lock();
2137
2138         err = -EADDRNOTAVAIL;
2139
2140         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2141                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2142                     pmc->multi.imr_ifindex == gsf->gf_interface)
2143                         break;
2144         }
2145         if (!pmc)               /* must have a prior join */
2146                 goto done;
2147         gsf->gf_fmode = pmc->sfmode;
2148         psl = pmc->sflist;
2149         rtnl_unlock();
2150         count = psl ? psl->sl_count : 0;
2151         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2152         gsf->gf_numsrc = count;
2153         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2154             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2155                 return -EFAULT;
2156         }
2157         for (i=0; i<copycount; i++) {
2158                 struct sockaddr_storage ss;
2159
2160                 psin = (struct sockaddr_in *)&ss;
2161                 memset(&ss, 0, sizeof(ss));
2162                 psin->sin_family = AF_INET;
2163                 psin->sin_addr.s_addr = psl->sl_addr[i];
2164                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2165                         return -EFAULT;
2166         }
2167         return 0;
2168 done:
2169         rtnl_unlock();
2170         return err;
2171 }
2172
2173 /*
2174  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2175  */
2176 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2177 {
2178         struct inet_sock *inet = inet_sk(sk);
2179         struct ip_mc_socklist *pmc;
2180         struct ip_sf_socklist *psl;
2181         int i;
2182
2183         if (!ipv4_is_multicast(loc_addr))
2184                 return 1;
2185
2186         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2187                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2188                     pmc->multi.imr_ifindex == dif)
2189                         break;
2190         }
2191         if (!pmc)
2192                 return 1;
2193         psl = pmc->sflist;
2194         if (!psl)
2195                 return pmc->sfmode == MCAST_EXCLUDE;
2196
2197         for (i=0; i<psl->sl_count; i++) {
2198                 if (psl->sl_addr[i] == rmt_addr)
2199                         break;
2200         }
2201         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2202                 return 0;
2203         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2204                 return 0;
2205         return 1;
2206 }
2207
2208 /*
2209  *      A socket is closing.
2210  */
2211
2212 void ip_mc_drop_socket(struct sock *sk)
2213 {
2214         struct inet_sock *inet = inet_sk(sk);
2215         struct ip_mc_socklist *iml;
2216
2217         if (inet->mc_list == NULL)
2218                 return;
2219
2220         rtnl_lock();
2221         while ((iml = inet->mc_list) != NULL) {
2222                 struct in_device *in_dev;
2223                 inet->mc_list = iml->next;
2224
2225                 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex);
2226                 (void) ip_mc_leave_src(sk, iml, in_dev);
2227                 if (in_dev != NULL) {
2228                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2229                         in_dev_put(in_dev);
2230                 }
2231                 sock_kfree_s(sk, iml, sizeof(*iml));
2232         }
2233         rtnl_unlock();
2234 }
2235
2236 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2237 {
2238         struct ip_mc_list *im;
2239         struct ip_sf_list *psf;
2240         int rv = 0;
2241
2242         read_lock(&in_dev->mc_list_lock);
2243         for (im=in_dev->mc_list; im; im=im->next) {
2244                 if (im->multiaddr == mc_addr)
2245                         break;
2246         }
2247         if (im && proto == IPPROTO_IGMP) {
2248                 rv = 1;
2249         } else if (im) {
2250                 if (src_addr) {
2251                         for (psf=im->sources; psf; psf=psf->sf_next) {
2252                                 if (psf->sf_inaddr == src_addr)
2253                                         break;
2254                         }
2255                         if (psf)
2256                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2257                                         psf->sf_count[MCAST_EXCLUDE] !=
2258                                         im->sfcount[MCAST_EXCLUDE];
2259                         else
2260                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2261                 } else
2262                         rv = 1; /* unspecified source; tentatively allow */
2263         }
2264         read_unlock(&in_dev->mc_list_lock);
2265         return rv;
2266 }
2267
2268 #if defined(CONFIG_PROC_FS)
2269 struct igmp_mc_iter_state {
2270         struct net_device *dev;
2271         struct in_device *in_dev;
2272 };
2273
2274 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2275
2276 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2277 {
2278         struct ip_mc_list *im = NULL;
2279         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2280
2281         state->in_dev = NULL;
2282         for_each_netdev(&init_net, state->dev) {
2283                 struct in_device *in_dev;
2284                 in_dev = in_dev_get(state->dev);
2285                 if (!in_dev)
2286                         continue;
2287                 read_lock(&in_dev->mc_list_lock);
2288                 im = in_dev->mc_list;
2289                 if (im) {
2290                         state->in_dev = in_dev;
2291                         break;
2292                 }
2293                 read_unlock(&in_dev->mc_list_lock);
2294                 in_dev_put(in_dev);
2295         }
2296         return im;
2297 }
2298
2299 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2300 {
2301         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2302         im = im->next;
2303         while (!im) {
2304                 if (likely(state->in_dev != NULL)) {
2305                         read_unlock(&state->in_dev->mc_list_lock);
2306                         in_dev_put(state->in_dev);
2307                 }
2308                 state->dev = next_net_device(state->dev);
2309                 if (!state->dev) {
2310                         state->in_dev = NULL;
2311                         break;
2312                 }
2313                 state->in_dev = in_dev_get(state->dev);
2314                 if (!state->in_dev)
2315                         continue;
2316                 read_lock(&state->in_dev->mc_list_lock);
2317                 im = state->in_dev->mc_list;
2318         }
2319         return im;
2320 }
2321
2322 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2323 {
2324         struct ip_mc_list *im = igmp_mc_get_first(seq);
2325         if (im)
2326                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2327                         --pos;
2328         return pos ? NULL : im;
2329 }
2330
2331 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2332         __acquires(dev_base_lock)
2333 {
2334         read_lock(&dev_base_lock);
2335         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2336 }
2337
2338 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2339 {
2340         struct ip_mc_list *im;
2341         if (v == SEQ_START_TOKEN)
2342                 im = igmp_mc_get_first(seq);
2343         else
2344                 im = igmp_mc_get_next(seq, v);
2345         ++*pos;
2346         return im;
2347 }
2348
2349 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2350         __releases(dev_base_lock)
2351 {
2352         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2353         if (likely(state->in_dev != NULL)) {
2354                 read_unlock(&state->in_dev->mc_list_lock);
2355                 in_dev_put(state->in_dev);
2356                 state->in_dev = NULL;
2357         }
2358         state->dev = NULL;
2359         read_unlock(&dev_base_lock);
2360 }
2361
2362 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2363 {
2364         if (v == SEQ_START_TOKEN)
2365                 seq_puts(seq,
2366                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2367         else {
2368                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2369                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2370                 char   *querier;
2371 #ifdef CONFIG_IP_MULTICAST
2372                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2373                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2374                           "V3";
2375 #else
2376                 querier = "NONE";
2377 #endif
2378
2379                 if (state->in_dev->mc_list == im) {
2380                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2381                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2382                 }
2383
2384                 seq_printf(seq,
2385                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2386                            im->multiaddr, im->users,
2387                            im->tm_running, im->tm_running ?
2388                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2389                            im->reporter);
2390         }
2391         return 0;
2392 }
2393
2394 static const struct seq_operations igmp_mc_seq_ops = {
2395         .start  =       igmp_mc_seq_start,
2396         .next   =       igmp_mc_seq_next,
2397         .stop   =       igmp_mc_seq_stop,
2398         .show   =       igmp_mc_seq_show,
2399 };
2400
2401 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2402 {
2403         return seq_open_private(file, &igmp_mc_seq_ops,
2404                         sizeof(struct igmp_mc_iter_state));
2405 }
2406
2407 static const struct file_operations igmp_mc_seq_fops = {
2408         .owner          =       THIS_MODULE,
2409         .open           =       igmp_mc_seq_open,
2410         .read           =       seq_read,
2411         .llseek         =       seq_lseek,
2412         .release        =       seq_release_private,
2413 };
2414
2415 struct igmp_mcf_iter_state {
2416         struct net_device *dev;
2417         struct in_device *idev;
2418         struct ip_mc_list *im;
2419 };
2420
2421 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2422
2423 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2424 {
2425         struct ip_sf_list *psf = NULL;
2426         struct ip_mc_list *im = NULL;
2427         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2428
2429         state->idev = NULL;
2430         state->im = NULL;
2431         for_each_netdev(&init_net, state->dev) {
2432                 struct in_device *idev;
2433                 idev = in_dev_get(state->dev);
2434                 if (unlikely(idev == NULL))
2435                         continue;
2436                 read_lock(&idev->mc_list_lock);
2437                 im = idev->mc_list;
2438                 if (likely(im != NULL)) {
2439                         spin_lock_bh(&im->lock);
2440                         psf = im->sources;
2441                         if (likely(psf != NULL)) {
2442                                 state->im = im;
2443                                 state->idev = idev;
2444                                 break;
2445                         }
2446                         spin_unlock_bh(&im->lock);
2447                 }
2448                 read_unlock(&idev->mc_list_lock);
2449                 in_dev_put(idev);
2450         }
2451         return psf;
2452 }
2453
2454 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2455 {
2456         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2457
2458         psf = psf->sf_next;
2459         while (!psf) {
2460                 spin_unlock_bh(&state->im->lock);
2461                 state->im = state->im->next;
2462                 while (!state->im) {
2463                         if (likely(state->idev != NULL)) {
2464                                 read_unlock(&state->idev->mc_list_lock);
2465                                 in_dev_put(state->idev);
2466                         }
2467                         state->dev = next_net_device(state->dev);
2468                         if (!state->dev) {
2469                                 state->idev = NULL;
2470                                 goto out;
2471                         }
2472                         state->idev = in_dev_get(state->dev);
2473                         if (!state->idev)
2474                                 continue;
2475                         read_lock(&state->idev->mc_list_lock);
2476                         state->im = state->idev->mc_list;
2477                 }
2478                 if (!state->im)
2479                         break;
2480                 spin_lock_bh(&state->im->lock);
2481                 psf = state->im->sources;
2482         }
2483 out:
2484         return psf;
2485 }
2486
2487 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2488 {
2489         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2490         if (psf)
2491                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2492                         --pos;
2493         return pos ? NULL : psf;
2494 }
2495
2496 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2497 {
2498         read_lock(&dev_base_lock);
2499         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2500 }
2501
2502 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2503 {
2504         struct ip_sf_list *psf;
2505         if (v == SEQ_START_TOKEN)
2506                 psf = igmp_mcf_get_first(seq);
2507         else
2508                 psf = igmp_mcf_get_next(seq, v);
2509         ++*pos;
2510         return psf;
2511 }
2512
2513 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2514 {
2515         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2516         if (likely(state->im != NULL)) {
2517                 spin_unlock_bh(&state->im->lock);
2518                 state->im = NULL;
2519         }
2520         if (likely(state->idev != NULL)) {
2521                 read_unlock(&state->idev->mc_list_lock);
2522                 in_dev_put(state->idev);
2523                 state->idev = NULL;
2524         }
2525         state->dev = NULL;
2526         read_unlock(&dev_base_lock);
2527 }
2528
2529 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2530 {
2531         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2532         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2533
2534         if (v == SEQ_START_TOKEN) {
2535                 seq_printf(seq,
2536                            "%3s %6s "
2537                            "%10s %10s %6s %6s\n", "Idx",
2538                            "Device", "MCA",
2539                            "SRC", "INC", "EXC");
2540         } else {
2541                 seq_printf(seq,
2542                            "%3d %6.6s 0x%08x "
2543                            "0x%08x %6lu %6lu\n",
2544                            state->dev->ifindex, state->dev->name,
2545                            ntohl(state->im->multiaddr),
2546                            ntohl(psf->sf_inaddr),
2547                            psf->sf_count[MCAST_INCLUDE],
2548                            psf->sf_count[MCAST_EXCLUDE]);
2549         }
2550         return 0;
2551 }
2552
2553 static const struct seq_operations igmp_mcf_seq_ops = {
2554         .start  =       igmp_mcf_seq_start,
2555         .next   =       igmp_mcf_seq_next,
2556         .stop   =       igmp_mcf_seq_stop,
2557         .show   =       igmp_mcf_seq_show,
2558 };
2559
2560 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2561 {
2562         return seq_open_private(file, &igmp_mcf_seq_ops,
2563                         sizeof(struct igmp_mcf_iter_state));
2564 }
2565
2566 static const struct file_operations igmp_mcf_seq_fops = {
2567         .owner          =       THIS_MODULE,
2568         .open           =       igmp_mcf_seq_open,
2569         .read           =       seq_read,
2570         .llseek         =       seq_lseek,
2571         .release        =       seq_release_private,
2572 };
2573
2574 int __init igmp_mc_proc_init(void)
2575 {
2576         proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2577         proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2578         return 0;
2579 }
2580 #endif
2581
2582 EXPORT_SYMBOL(ip_mc_dec_group);
2583 EXPORT_SYMBOL(ip_mc_inc_group);
2584 EXPORT_SYMBOL(ip_mc_join_group);
2585 EXPORT_SYMBOL(ip_mc_rejoin_group);