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   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/arp.h>
  95 #include <net/ip.h>
  96 #include <net/protocol.h>
  97 #include <net/route.h>
  98 #include <net/sock.h>
  99 #include <net/checksum.h>
 100 #include <linux/netfilter_ipv4.h>
 101 #ifdef CONFIG_IP_MROUTE
 102 #include <linux/mroute.h>
 103 #endif
 104 #ifdef CONFIG_PROC_FS
 105 #include <linux/proc_fs.h>
 106 #include <linux/seq_file.h>
 107 #endif
 108
 109 #define IP_MAX_MEMBERSHIPS      20
 110 #define IP_MAX_MSF              10
 111
 112 #ifdef CONFIG_IP_MULTICAST
 113 /* Parameter names and values are taken from igmp-v2-06 draft */
 114
 115 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 116 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 117 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 118 #define IGMP_Query_Response_Interval            (10*HZ)
 119 #define IGMP_Unsolicited_Report_Count           2
 120
 121
 122 #define IGMP_Initial_Report_Delay               (1)
 123
 124 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 125  * IGMP specs require to report membership immediately after
 126  * joining a group, but we delay the first report by a
 127  * small interval. It seems more natural and still does not
 128  * contradict to specs provided this delay is small enough.
 129  */
 130
 131 #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \
 132                 (in_dev)->cnf.force_igmp_version == 1 || \
 133                 ((in_dev)->mr_v1_seen && \
 134                 time_before(jiffies, (in_dev)->mr_v1_seen)))
 135 #define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \
 136                 (in_dev)->cnf.force_igmp_version == 2 || \
 137                 ((in_dev)->mr_v2_seen && \
 138                 time_before(jiffies, (in_dev)->mr_v2_seen)))
 139
 140 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 141 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr);
 142 static void igmpv3_clear_delrec(struct in_device *in_dev);
 143 static int sf_setstate(struct ip_mc_list *pmc);
 144 static void sf_markstate(struct ip_mc_list *pmc);
 145 #endif
 146 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 147 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
 148                          int sfcount, __u32 *psfsrc, int delta);
 149
 150 static void ip_ma_put(struct ip_mc_list *im)
 151 {
 152         if (atomic_dec_and_test(&im->refcnt)) {
 153                 in_dev_put(im->interface);
 154                 kfree(im);
 155         }
 156 }
 157
 158 #ifdef CONFIG_IP_MULTICAST
 159
 160 /*
 161  *      Timer management
 162  */
 163
 164 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 165 {
 166         spin_lock_bh(&im->lock);
 167         if (del_timer(&im->timer))
 168                 atomic_dec(&im->refcnt);
 169         im->tm_running=0;
 170         im->reporter = 0;
 171         im->unsolicit_count = 0;
 172         spin_unlock_bh(&im->lock);
 173 }
 174
 175 /* It must be called with locked im->lock */
 176 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 177 {
 178         int tv=net_random() % max_delay;
 179
 180         im->tm_running=1;
 181         if (!mod_timer(&im->timer, jiffies+tv+2))
 182                 atomic_inc(&im->refcnt);
 183 }
 184
 185 static void igmp_gq_start_timer(struct in_device *in_dev)
 186 {
 187         int tv = net_random() % in_dev->mr_maxdelay;
 188
 189         in_dev->mr_gq_running = 1;
 190         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 191                 in_dev_hold(in_dev);
 192 }
 193
 194 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 195 {
 196         int tv = net_random() % delay;
 197
 198         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 199                 in_dev_hold(in_dev);
 200 }
 201
 202 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 203 {
 204         spin_lock_bh(&im->lock);
 205         im->unsolicit_count = 0;
 206         if (del_timer(&im->timer)) {
 207                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 208                         add_timer(&im->timer);
 209                         im->tm_running=1;
 210                         spin_unlock_bh(&im->lock);
 211                         return;
 212                 }
 213                 atomic_dec(&im->refcnt);
 214         }
 215         igmp_start_timer(im, max_delay);
 216         spin_unlock_bh(&im->lock);
 217 }
 218
 219
 220 /*
 221  *      Send an IGMP report.
 222  */
 223
 224 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 225
 226
 227 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 228         int gdeleted, int sdeleted)
 229 {
 230         switch (type) {
 231         case IGMPV3_MODE_IS_INCLUDE:
 232         case IGMPV3_MODE_IS_EXCLUDE:
 233                 if (gdeleted || sdeleted)
 234                         return 0;
 235                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 236                         if (pmc->sfmode == MCAST_INCLUDE)
 237                                 return 1;
 238                         /* don't include if this source is excluded
 239                          * in all filters
 240                          */
 241                         if (psf->sf_count[MCAST_INCLUDE])
 242                                 return type == IGMPV3_MODE_IS_INCLUDE;
 243                         return pmc->sfcount[MCAST_EXCLUDE] ==
 244                                 psf->sf_count[MCAST_EXCLUDE];
 245                 }
 246                 return 0;
 247         case IGMPV3_CHANGE_TO_INCLUDE:
 248                 if (gdeleted || sdeleted)
 249                         return 0;
 250                 return psf->sf_count[MCAST_INCLUDE] != 0;
 251         case IGMPV3_CHANGE_TO_EXCLUDE:
 252                 if (gdeleted || sdeleted)
 253                         return 0;
 254                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 255                     psf->sf_count[MCAST_INCLUDE])
 256                         return 0;
 257                 return pmc->sfcount[MCAST_EXCLUDE] ==
 258                         psf->sf_count[MCAST_EXCLUDE];
 259         case IGMPV3_ALLOW_NEW_SOURCES:
 260                 if (gdeleted || !psf->sf_crcount)
 261                         return 0;
 262                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 263         case IGMPV3_BLOCK_OLD_SOURCES:
 264                 if (pmc->sfmode == MCAST_INCLUDE)
 265                         return gdeleted || (psf->sf_crcount && sdeleted);
 266                 return psf->sf_crcount && !gdeleted && !sdeleted;
 267         }
 268         return 0;
 269 }
 270
 271 static int
 272 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 273 {
 274         struct ip_sf_list *psf;
 275         int scount = 0;
 276
 277         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 278                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 279                         continue;
 280                 scount++;
 281         }
 282         return scount;
 283 }
 284
 285 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 286 {
 287         struct sk_buff *skb;
 288         struct rtable *rt;
 289         struct iphdr *pip;
 290         struct igmpv3_report *pig;
 291
 292         skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 293         if (skb == NULL)
 294                 return NULL;
 295
 296         {
 297                 struct flowi fl = { .oif = dev->ifindex,
 298                                     .nl_u = { .ip4_u = {
 299                                     .daddr = IGMPV3_ALL_MCR } },
 300                                     .proto = IPPROTO_IGMP };
 301                 if (ip_route_output_key(&rt, &fl)) {
 302                         kfree_skb(skb);
 303                         return NULL;
 304                 }
 305         }
 306         if (rt->rt_src == 0) {
 307                 kfree_skb(skb);
 308                 ip_rt_put(rt);
 309                 return NULL;
 310         }
 311
 312         skb->dst = &rt->u.dst;
 313         skb->dev = dev;
 314
 315         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 316
 317         skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
 318
 319         pip->version  = 4;
 320         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 321         pip->tos      = 0xc0;
 322         pip->frag_off = htons(IP_DF);
 323         pip->ttl      = 1;
 324         pip->daddr    = rt->rt_dst;
 325         pip->saddr    = rt->rt_src;
 326         pip->protocol = IPPROTO_IGMP;
 327         pip->tot_len  = 0;      /* filled in later */
 328         ip_select_ident(pip, &rt->u.dst, NULL);
 329         ((u8*)&pip[1])[0] = IPOPT_RA;
 330         ((u8*)&pip[1])[1] = 4;
 331         ((u8*)&pip[1])[2] = 0;
 332         ((u8*)&pip[1])[3] = 0;
 333
 334         pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig));
 335         skb->h.igmph = (struct igmphdr *)pig;
 336         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 337         pig->resv1 = 0;
 338         pig->csum = 0;
 339         pig->resv2 = 0;
 340         pig->ngrec = 0;
 341         return skb;
 342 }
 343
 344 static int igmpv3_sendpack(struct sk_buff *skb)
 345 {
 346         struct iphdr *pip = skb->nh.iph;
 347         struct igmphdr *pig = skb->h.igmph;
 348         int iplen, igmplen;
 349
 350         iplen = skb->tail - (unsigned char *)skb->nh.iph;
 351         pip->tot_len = htons(iplen);
 352         ip_send_check(pip);
 353
 354         igmplen = skb->tail - (unsigned char *)skb->h.igmph;
 355         pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen);
 356
 357         return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
 358                        dst_output);
 359 }
 360
 361 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 362 {
 363         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
 364 }
 365
 366 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 367         int type, struct igmpv3_grec **ppgr)
 368 {
 369         struct net_device *dev = pmc->interface->dev;
 370         struct igmpv3_report *pih;
 371         struct igmpv3_grec *pgr;
 372
 373         if (!skb)
 374                 skb = igmpv3_newpack(dev, dev->mtu);
 375         if (!skb)
 376                 return NULL;
 377         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 378         pgr->grec_type = type;
 379         pgr->grec_auxwords = 0;
 380         pgr->grec_nsrcs = 0;
 381         pgr->grec_mca = pmc->multiaddr;
 382         pih = (struct igmpv3_report *)skb->h.igmph;
 383         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 384         *ppgr = pgr;
 385         return skb;
 386 }
 387
 388 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 389         skb_tailroom(skb)) : 0)
 390
 391 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 392         int type, int gdeleted, int sdeleted)
 393 {
 394         struct net_device *dev = pmc->interface->dev;
 395         struct igmpv3_report *pih;
 396         struct igmpv3_grec *pgr = NULL;
 397         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 398         int scount, stotal, first, isquery, truncate;
 399
 400         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 401                 return skb;
 402
 403         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 404                   type == IGMPV3_MODE_IS_EXCLUDE;
 405         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 406                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 407
 408         stotal = scount = 0;
 409
 410         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 411
 412         if (!*psf_list)
 413                 goto empty_source;
 414
 415         pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL;
 416
 417         /* EX and TO_EX get a fresh packet, if needed */
 418         if (truncate) {
 419                 if (pih && pih->ngrec &&
 420                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 421                         if (skb)
 422                                 igmpv3_sendpack(skb);
 423                         skb = igmpv3_newpack(dev, dev->mtu);
 424                 }
 425         }
 426         first = 1;
 427         psf_prev = NULL;
 428         for (psf=*psf_list; psf; psf=psf_next) {
 429                 u32 *psrc;
 430
 431                 psf_next = psf->sf_next;
 432
 433                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 434                         psf_prev = psf;
 435                         continue;
 436                 }
 437
 438                 /* clear marks on query responses */
 439                 if (isquery)
 440                         psf->sf_gsresp = 0;
 441
 442                 if (AVAILABLE(skb) < sizeof(u32) +
 443                     first*sizeof(struct igmpv3_grec)) {
 444                         if (truncate && !first)
 445                                 break;   /* truncate these */
 446                         if (pgr)
 447                                 pgr->grec_nsrcs = htons(scount);
 448                         if (skb)
 449                                 igmpv3_sendpack(skb);
 450                         skb = igmpv3_newpack(dev, dev->mtu);
 451                         first = 1;
 452                         scount = 0;
 453                 }
 454                 if (first) {
 455                         skb = add_grhead(skb, pmc, type, &pgr);
 456                         first = 0;
 457                 }
 458                 psrc = (u32 *)skb_put(skb, sizeof(u32));
 459                 *psrc = psf->sf_inaddr;
 460                 scount++; stotal++;
 461                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 462                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 463                         psf->sf_crcount--;
 464                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 465                                 if (psf_prev)
 466                                         psf_prev->sf_next = psf->sf_next;
 467                                 else
 468                                         *psf_list = psf->sf_next;
 469                                 kfree(psf);
 470                                 continue;
 471                         }
 472                 }
 473                 psf_prev = psf;
 474         }
 475
 476 empty_source:
 477         if (!stotal) {
 478                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 479                     type == IGMPV3_BLOCK_OLD_SOURCES)
 480                         return skb;
 481                 if (pmc->crcount || isquery) {
 482                         /* make sure we have room for group header */
 483                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 484                                 igmpv3_sendpack(skb);
 485                                 skb = NULL; /* add_grhead will get a new one */
 486                         }
 487                         skb = add_grhead(skb, pmc, type, &pgr);
 488                 }
 489         }
 490         if (pgr)
 491                 pgr->grec_nsrcs = htons(scount);
 492
 493         if (isquery)
 494                 pmc->gsquery = 0;       /* clear query state on report */
 495         return skb;
 496 }
 497
 498 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 499 {
 500         struct sk_buff *skb = NULL;
 501         int type;
 502
 503         if (!pmc) {
 504                 read_lock(&in_dev->mc_list_lock);
 505                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 506                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 507                                 continue;
 508                         spin_lock_bh(&pmc->lock);
 509                         if (pmc->sfcount[MCAST_EXCLUDE])
 510                                 type = IGMPV3_MODE_IS_EXCLUDE;
 511                         else
 512                                 type = IGMPV3_MODE_IS_INCLUDE;
 513                         skb = add_grec(skb, pmc, type, 0, 0);
 514                         spin_unlock_bh(&pmc->lock);
 515                 }
 516                 read_unlock(&in_dev->mc_list_lock);
 517         } else {
 518                 spin_lock_bh(&pmc->lock);
 519                 if (pmc->sfcount[MCAST_EXCLUDE])
 520                         type = IGMPV3_MODE_IS_EXCLUDE;
 521                 else
 522                         type = IGMPV3_MODE_IS_INCLUDE;
 523                 skb = add_grec(skb, pmc, type, 0, 0);
 524                 spin_unlock_bh(&pmc->lock);
 525         }
 526         if (!skb)
 527                 return 0;
 528         return igmpv3_sendpack(skb);
 529 }
 530
 531 /*
 532  * remove zero-count source records from a source filter list
 533  */
 534 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 535 {
 536         struct ip_sf_list *psf_prev, *psf_next, *psf;
 537
 538         psf_prev = NULL;
 539         for (psf=*ppsf; psf; psf = psf_next) {
 540                 psf_next = psf->sf_next;
 541                 if (psf->sf_crcount == 0) {
 542                         if (psf_prev)
 543                                 psf_prev->sf_next = psf->sf_next;
 544                         else
 545                                 *ppsf = psf->sf_next;
 546                         kfree(psf);
 547                 } else
 548                         psf_prev = psf;
 549         }
 550 }
 551
 552 static void igmpv3_send_cr(struct in_device *in_dev)
 553 {
 554         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 555         struct sk_buff *skb = NULL;
 556         int type, dtype;
 557
 558         read_lock(&in_dev->mc_list_lock);
 559         spin_lock_bh(&in_dev->mc_tomb_lock);
 560
 561         /* deleted MCA's */
 562         pmc_prev = NULL;
 563         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 564                 pmc_next = pmc->next;
 565                 if (pmc->sfmode == MCAST_INCLUDE) {
 566                         type = IGMPV3_BLOCK_OLD_SOURCES;
 567                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 568                         skb = add_grec(skb, pmc, type, 1, 0);
 569                         skb = add_grec(skb, pmc, dtype, 1, 1);
 570                 }
 571                 if (pmc->crcount) {
 572                         if (pmc->sfmode == MCAST_EXCLUDE) {
 573                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 574                                 skb = add_grec(skb, pmc, type, 1, 0);
 575                         }
 576                         pmc->crcount--;
 577                         if (pmc->crcount == 0) {
 578                                 igmpv3_clear_zeros(&pmc->tomb);
 579                                 igmpv3_clear_zeros(&pmc->sources);
 580                         }
 581                 }
 582                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 583                         if (pmc_prev)
 584                                 pmc_prev->next = pmc_next;
 585                         else
 586                                 in_dev->mc_tomb = pmc_next;
 587                         in_dev_put(pmc->interface);
 588                         kfree(pmc);
 589                 } else
 590                         pmc_prev = pmc;
 591         }
 592         spin_unlock_bh(&in_dev->mc_tomb_lock);
 593
 594         /* change recs */
 595         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 596                 spin_lock_bh(&pmc->lock);
 597                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 598                         type = IGMPV3_BLOCK_OLD_SOURCES;
 599                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 600                 } else {
 601                         type = IGMPV3_ALLOW_NEW_SOURCES;
 602                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 603                 }
 604                 skb = add_grec(skb, pmc, type, 0, 0);
 605                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 606
 607                 /* filter mode changes */
 608                 if (pmc->crcount) {
 609                         if (pmc->sfmode == MCAST_EXCLUDE)
 610                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 611                         else
 612                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 613                         skb = add_grec(skb, pmc, type, 0, 0);
 614                         pmc->crcount--;
 615                 }
 616                 spin_unlock_bh(&pmc->lock);
 617         }
 618         read_unlock(&in_dev->mc_list_lock);
 619
 620         if (!skb)
 621                 return;
 622         (void) igmpv3_sendpack(skb);
 623 }
 624
 625 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 626         int type)
 627 {
 628         struct sk_buff *skb;
 629         struct iphdr *iph;
 630         struct igmphdr *ih;
 631         struct rtable *rt;
 632         struct net_device *dev = in_dev->dev;
 633         u32     group = pmc ? pmc->multiaddr : 0;
 634         u32     dst;
 635
 636         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 637                 return igmpv3_send_report(in_dev, pmc);
 638         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 639                 dst = IGMP_ALL_ROUTER;
 640         else
 641                 dst = group;
 642
 643         {
 644                 struct flowi fl = { .oif = dev->ifindex,
 645                                     .nl_u = { .ip4_u = { .daddr = dst } },
 646                                     .proto = IPPROTO_IGMP };
 647                 if (ip_route_output_key(&rt, &fl))
 648                         return -1;
 649         }
 650         if (rt->rt_src == 0) {
 651                 ip_rt_put(rt);
 652                 return -1;
 653         }
 654
 655         skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 656         if (skb == NULL) {
 657                 ip_rt_put(rt);
 658                 return -1;
 659         }
 660
 661         skb->dst = &rt->u.dst;
 662
 663         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 664
 665         skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
 666
 667         iph->version  = 4;
 668         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 669         iph->tos      = 0xc0;
 670         iph->frag_off = htons(IP_DF);
 671         iph->ttl      = 1;
 672         iph->daddr    = dst;
 673         iph->saddr    = rt->rt_src;
 674         iph->protocol = IPPROTO_IGMP;
 675         iph->tot_len  = htons(IGMP_SIZE);
 676         ip_select_ident(iph, &rt->u.dst, NULL);
 677         ((u8*)&iph[1])[0] = IPOPT_RA;
 678         ((u8*)&iph[1])[1] = 4;
 679         ((u8*)&iph[1])[2] = 0;
 680         ((u8*)&iph[1])[3] = 0;
 681         ip_send_check(iph);
 682
 683         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 684         ih->type=type;
 685         ih->code=0;
 686         ih->csum=0;
 687         ih->group=group;
 688         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 689
 690         return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
 691                        dst_output);
 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, __u32 *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, __u32 *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, u32 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 = skb->h.igmph;
 829         struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
 830         struct ip_mc_list       *im;
 831         u32                     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 = (struct igmpv3_query *) skb->h.raw;
 863                 if (ih3->nsrcs) {
 864                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 865                                            + ntohs(ih3->nsrcs)*sizeof(__u32)))
 866                                 return;
 867                         ih3 = (struct igmpv3_query *) skb->h.raw;
 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_HW:
 935                 if (!(u16)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 = skb->h.igmph;
 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, u32 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, u32 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 = kmalloc(sizeof(*pmc), GFP_KERNEL);
1032         if (!pmc)
1033                 return;
1034         memset(pmc, 0, sizeof(*pmc));
1035         spin_lock_bh(&im->lock);
1036         pmc->interface = im->interface;
1037         in_dev_hold(in_dev);
1038         pmc->multiaddr = im->multiaddr;
1039         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1040                 IGMP_Unsolicited_Report_Count;
1041         pmc->sfmode = im->sfmode;
1042         if (pmc->sfmode == MCAST_INCLUDE) {
1043                 struct ip_sf_list *psf;
1044
1045                 pmc->tomb = im->tomb;
1046                 pmc->sources = im->sources;
1047                 im->tomb = im->sources = NULL;
1048                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1049                         psf->sf_crcount = pmc->crcount;
1050         }
1051         spin_unlock_bh(&im->lock);
1052
1053         spin_lock_bh(&in_dev->mc_tomb_lock);
1054         pmc->next = in_dev->mc_tomb;
1055         in_dev->mc_tomb = pmc;
1056         spin_unlock_bh(&in_dev->mc_tomb_lock);
1057 }
1058
1059 static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr)
1060 {
1061         struct ip_mc_list *pmc, *pmc_prev;
1062         struct ip_sf_list *psf, *psf_next;
1063
1064         spin_lock_bh(&in_dev->mc_tomb_lock);
1065         pmc_prev = NULL;
1066         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1067                 if (pmc->multiaddr == multiaddr)
1068                         break;
1069                 pmc_prev = pmc;
1070         }
1071         if (pmc) {
1072                 if (pmc_prev)
1073                         pmc_prev->next = pmc->next;
1074                 else
1075                         in_dev->mc_tomb = pmc->next;
1076         }
1077         spin_unlock_bh(&in_dev->mc_tomb_lock);
1078         if (pmc) {
1079                 for (psf=pmc->tomb; psf; psf=psf_next) {
1080                         psf_next = psf->sf_next;
1081                         kfree(psf);
1082                 }
1083                 in_dev_put(pmc->interface);
1084                 kfree(pmc);
1085         }
1086 }
1087
1088 static void igmpv3_clear_delrec(struct in_device *in_dev)
1089 {
1090         struct ip_mc_list *pmc, *nextpmc;
1091
1092         spin_lock_bh(&in_dev->mc_tomb_lock);
1093         pmc = in_dev->mc_tomb;
1094         in_dev->mc_tomb = NULL;
1095         spin_unlock_bh(&in_dev->mc_tomb_lock);
1096
1097         for (; pmc; pmc = nextpmc) {
1098                 nextpmc = pmc->next;
1099                 ip_mc_clear_src(pmc);
1100                 in_dev_put(pmc->interface);
1101                 kfree(pmc);
1102         }
1103         /* clear dead sources, too */
1104         read_lock(&in_dev->mc_list_lock);
1105         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1106                 struct ip_sf_list *psf, *psf_next;
1107
1108                 spin_lock_bh(&pmc->lock);
1109                 psf = pmc->tomb;
1110                 pmc->tomb = NULL;
1111                 spin_unlock_bh(&pmc->lock);
1112                 for (; psf; psf=psf_next) {
1113                         psf_next = psf->sf_next;
1114                         kfree(psf);
1115                 }
1116         }
1117         read_unlock(&in_dev->mc_list_lock);
1118 }
1119 #endif
1120
1121 static void igmp_group_dropped(struct ip_mc_list *im)
1122 {
1123         struct in_device *in_dev = im->interface;
1124 #ifdef CONFIG_IP_MULTICAST
1125         int reporter;
1126 #endif
1127
1128         if (im->loaded) {
1129                 im->loaded = 0;
1130                 ip_mc_filter_del(in_dev, im->multiaddr);
1131         }
1132
1133 #ifdef CONFIG_IP_MULTICAST
1134         if (im->multiaddr == IGMP_ALL_HOSTS)
1135                 return;
1136
1137         reporter = im->reporter;
1138         igmp_stop_timer(im);
1139
1140         if (!in_dev->dead) {
1141                 if (IGMP_V1_SEEN(in_dev))
1142                         goto done;
1143                 if (IGMP_V2_SEEN(in_dev)) {
1144                         if (reporter)
1145                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1146                         goto done;
1147                 }
1148                 /* IGMPv3 */
1149                 igmpv3_add_delrec(in_dev, im);
1150
1151                 igmp_ifc_event(in_dev);
1152         }
1153 done:
1154 #endif
1155         ip_mc_clear_src(im);
1156 }
1157
1158 static void igmp_group_added(struct ip_mc_list *im)
1159 {
1160         struct in_device *in_dev = im->interface;
1161
1162         if (im->loaded == 0) {
1163                 im->loaded = 1;
1164                 ip_mc_filter_add(in_dev, im->multiaddr);
1165         }
1166
1167 #ifdef CONFIG_IP_MULTICAST
1168         if (im->multiaddr == IGMP_ALL_HOSTS)
1169                 return;
1170
1171         if (in_dev->dead)
1172                 return;
1173         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1174                 spin_lock_bh(&im->lock);
1175                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1176                 spin_unlock_bh(&im->lock);
1177                 return;
1178         }
1179         /* else, v3 */
1180
1181         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1182                 IGMP_Unsolicited_Report_Count;
1183         igmp_ifc_event(in_dev);
1184 #endif
1185 }
1186
1187
1188 /*
1189  *      Multicast list managers
1190  */
1191
1192
1193 /*
1194  *      A socket has joined a multicast group on device dev.
1195  */
1196
1197 void ip_mc_inc_group(struct in_device *in_dev, u32 addr)
1198 {
1199         struct ip_mc_list *im;
1200
1201         ASSERT_RTNL();
1202
1203         for (im=in_dev->mc_list; im; im=im->next) {
1204                 if (im->multiaddr == addr) {
1205                         im->users++;
1206                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1207                         goto out;
1208                 }
1209         }
1210
1211         im = kmalloc(sizeof(*im), GFP_KERNEL);
1212         if (!im)
1213                 goto out;
1214
1215         im->users=1;
1216         im->interface=in_dev;
1217         in_dev_hold(in_dev);
1218         im->multiaddr=addr;
1219         /* initial mode is (EX, empty) */
1220         im->sfmode = MCAST_EXCLUDE;
1221         im->sfcount[MCAST_INCLUDE] = 0;
1222         im->sfcount[MCAST_EXCLUDE] = 1;
1223         im->sources = NULL;
1224         im->tomb = NULL;
1225         im->crcount = 0;
1226         atomic_set(&im->refcnt, 1);
1227         spin_lock_init(&im->lock);
1228 #ifdef CONFIG_IP_MULTICAST
1229         im->tm_running=0;
1230         init_timer(&im->timer);
1231         im->timer.data=(unsigned long)im;
1232         im->timer.function=&igmp_timer_expire;
1233         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1234         im->reporter = 0;
1235         im->gsquery = 0;
1236 #endif
1237         im->loaded = 0;
1238         write_lock_bh(&in_dev->mc_list_lock);
1239         im->next=in_dev->mc_list;
1240         in_dev->mc_list=im;
1241         write_unlock_bh(&in_dev->mc_list_lock);
1242 #ifdef CONFIG_IP_MULTICAST
1243         igmpv3_del_delrec(in_dev, im->multiaddr);
1244 #endif
1245         igmp_group_added(im);
1246         if (!in_dev->dead)
1247                 ip_rt_multicast_event(in_dev);
1248 out:
1249         return;
1250 }
1251
1252 /*
1253  *      A socket has left a multicast group on device dev
1254  */
1255
1256 void ip_mc_dec_group(struct in_device *in_dev, u32 addr)
1257 {
1258         struct ip_mc_list *i, **ip;
1259
1260         ASSERT_RTNL();
1261
1262         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1263                 if (i->multiaddr==addr) {
1264                         if (--i->users == 0) {
1265                                 write_lock_bh(&in_dev->mc_list_lock);
1266                                 *ip = i->next;
1267                                 write_unlock_bh(&in_dev->mc_list_lock);
1268                                 igmp_group_dropped(i);
1269
1270                                 if (!in_dev->dead)
1271                                         ip_rt_multicast_event(in_dev);
1272
1273                                 ip_ma_put(i);
1274                                 return;
1275                         }
1276                         break;
1277                 }
1278         }
1279 }
1280
1281 /* Device going down */
1282
1283 void ip_mc_down(struct in_device *in_dev)
1284 {
1285         struct ip_mc_list *i;
1286
1287         ASSERT_RTNL();
1288
1289         for (i=in_dev->mc_list; i; i=i->next)
1290                 igmp_group_dropped(i);
1291
1292 #ifdef CONFIG_IP_MULTICAST
1293         in_dev->mr_ifc_count = 0;
1294         if (del_timer(&in_dev->mr_ifc_timer))
1295                 __in_dev_put(in_dev);
1296         in_dev->mr_gq_running = 0;
1297         if (del_timer(&in_dev->mr_gq_timer))
1298                 __in_dev_put(in_dev);
1299         igmpv3_clear_delrec(in_dev);
1300 #endif
1301
1302         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1303 }
1304
1305 void ip_mc_init_dev(struct in_device *in_dev)
1306 {
1307         ASSERT_RTNL();
1308
1309         in_dev->mc_tomb = NULL;
1310 #ifdef CONFIG_IP_MULTICAST
1311         in_dev->mr_gq_running = 0;
1312         init_timer(&in_dev->mr_gq_timer);
1313         in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1314         in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1315         in_dev->mr_ifc_count = 0;
1316         init_timer(&in_dev->mr_ifc_timer);
1317         in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1318         in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1319         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1320 #endif
1321
1322         rwlock_init(&in_dev->mc_list_lock);
1323         spin_lock_init(&in_dev->mc_tomb_lock);
1324 }
1325
1326 /* Device going up */
1327
1328 void ip_mc_up(struct in_device *in_dev)
1329 {
1330         struct ip_mc_list *i;
1331
1332         ASSERT_RTNL();
1333
1334         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1335
1336         for (i=in_dev->mc_list; i; i=i->next)
1337                 igmp_group_added(i);
1338 }
1339
1340 /*
1341  *      Device is about to be destroyed: clean up.
1342  */
1343
1344 void ip_mc_destroy_dev(struct in_device *in_dev)
1345 {
1346         struct ip_mc_list *i;
1347
1348         ASSERT_RTNL();
1349
1350         /* Deactivate timers */
1351         ip_mc_down(in_dev);
1352
1353         write_lock_bh(&in_dev->mc_list_lock);
1354         while ((i = in_dev->mc_list) != NULL) {
1355                 in_dev->mc_list = i->next;
1356                 write_unlock_bh(&in_dev->mc_list_lock);
1357
1358                 igmp_group_dropped(i);
1359                 ip_ma_put(i);
1360
1361                 write_lock_bh(&in_dev->mc_list_lock);
1362         }
1363         write_unlock_bh(&in_dev->mc_list_lock);
1364 }
1365
1366 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1367 {
1368         struct flowi fl = { .nl_u = { .ip4_u =
1369                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1370         struct rtable *rt;
1371         struct net_device *dev = NULL;
1372         struct in_device *idev = NULL;
1373
1374         if (imr->imr_ifindex) {
1375                 idev = inetdev_by_index(imr->imr_ifindex);
1376                 if (idev)
1377                         __in_dev_put(idev);
1378                 return idev;
1379         }
1380         if (imr->imr_address.s_addr) {
1381                 dev = ip_dev_find(imr->imr_address.s_addr);
1382                 if (!dev)
1383                         return NULL;
1384                 dev_put(dev);
1385         }
1386
1387         if (!dev && !ip_route_output_key(&rt, &fl)) {
1388                 dev = rt->u.dst.dev;
1389                 ip_rt_put(rt);
1390         }
1391         if (dev) {
1392                 imr->imr_ifindex = dev->ifindex;
1393                 idev = __in_dev_get_rtnl(dev);
1394         }
1395         return idev;
1396 }
1397
1398 /*
1399  *      Join a socket to a group
1400  */
1401 int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS;
1402 int sysctl_igmp_max_msf = IP_MAX_MSF;
1403
1404
1405 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1406         __u32 *psfsrc)
1407 {
1408         struct ip_sf_list *psf, *psf_prev;
1409         int rv = 0;
1410
1411         psf_prev = NULL;
1412         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1413                 if (psf->sf_inaddr == *psfsrc)
1414                         break;
1415                 psf_prev = psf;
1416         }
1417         if (!psf || psf->sf_count[sfmode] == 0) {
1418                 /* source filter not found, or count wrong =>  bug */
1419                 return -ESRCH;
1420         }
1421         psf->sf_count[sfmode]--;
1422         if (psf->sf_count[sfmode] == 0) {
1423                 ip_rt_multicast_event(pmc->interface);
1424         }
1425         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1426 #ifdef CONFIG_IP_MULTICAST
1427                 struct in_device *in_dev = pmc->interface;
1428 #endif
1429
1430                 /* no more filters for this source */
1431                 if (psf_prev)
1432                         psf_prev->sf_next = psf->sf_next;
1433                 else
1434                         pmc->sources = psf->sf_next;
1435 #ifdef CONFIG_IP_MULTICAST
1436                 if (psf->sf_oldin &&
1437                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1438                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1439                                 IGMP_Unsolicited_Report_Count;
1440                         psf->sf_next = pmc->tomb;
1441                         pmc->tomb = psf;
1442                         rv = 1;
1443                 } else
1444 #endif
1445                         kfree(psf);
1446         }
1447         return rv;
1448 }
1449
1450 #ifndef CONFIG_IP_MULTICAST
1451 #define igmp_ifc_event(x)       do { } while (0)
1452 #endif
1453
1454 static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1455                          int sfcount, __u32 *psfsrc, int delta)
1456 {
1457         struct ip_mc_list *pmc;
1458         int     changerec = 0;
1459         int     i, err;
1460
1461         if (!in_dev)
1462                 return -ENODEV;
1463         read_lock(&in_dev->mc_list_lock);
1464         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1465                 if (*pmca == pmc->multiaddr)
1466                         break;
1467         }
1468         if (!pmc) {
1469                 /* MCA not found?? bug */
1470                 read_unlock(&in_dev->mc_list_lock);
1471                 return -ESRCH;
1472         }
1473         spin_lock_bh(&pmc->lock);
1474         read_unlock(&in_dev->mc_list_lock);
1475 #ifdef CONFIG_IP_MULTICAST
1476         sf_markstate(pmc);
1477 #endif
1478         if (!delta) {
1479                 err = -EINVAL;
1480                 if (!pmc->sfcount[sfmode])
1481                         goto out_unlock;
1482                 pmc->sfcount[sfmode]--;
1483         }
1484         err = 0;
1485         for (i=0; i<sfcount; i++) {
1486                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1487
1488                 changerec |= rv > 0;
1489                 if (!err && rv < 0)
1490                         err = rv;
1491         }
1492         if (pmc->sfmode == MCAST_EXCLUDE &&
1493             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1494             pmc->sfcount[MCAST_INCLUDE]) {
1495 #ifdef CONFIG_IP_MULTICAST
1496                 struct ip_sf_list *psf;
1497 #endif
1498
1499                 /* filter mode change */
1500                 pmc->sfmode = MCAST_INCLUDE;
1501 #ifdef CONFIG_IP_MULTICAST
1502                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1503                         IGMP_Unsolicited_Report_Count;
1504                 in_dev->mr_ifc_count = pmc->crcount;
1505                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1506                         psf->sf_crcount = 0;
1507                 igmp_ifc_event(pmc->interface);
1508         } else if (sf_setstate(pmc) || changerec) {
1509                 igmp_ifc_event(pmc->interface);
1510 #endif
1511         }
1512 out_unlock:
1513         spin_unlock_bh(&pmc->lock);
1514         return err;
1515 }
1516
1517 /*
1518  * Add multicast single-source filter to the interface list
1519  */
1520 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1521         __u32 *psfsrc, int delta)
1522 {
1523         struct ip_sf_list *psf, *psf_prev;
1524
1525         psf_prev = NULL;
1526         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1527                 if (psf->sf_inaddr == *psfsrc)
1528                         break;
1529                 psf_prev = psf;
1530         }
1531         if (!psf) {
1532                 psf = kmalloc(sizeof(*psf), GFP_ATOMIC);
1533                 if (!psf)
1534                         return -ENOBUFS;
1535                 memset(psf, 0, sizeof(*psf));
1536                 psf->sf_inaddr = *psfsrc;
1537                 if (psf_prev) {
1538                         psf_prev->sf_next = psf;
1539                 } else
1540                         pmc->sources = psf;
1541         }
1542         psf->sf_count[sfmode]++;
1543         if (psf->sf_count[sfmode] == 1) {
1544                 ip_rt_multicast_event(pmc->interface);
1545         }
1546         return 0;
1547 }
1548
1549 #ifdef CONFIG_IP_MULTICAST
1550 static void sf_markstate(struct ip_mc_list *pmc)
1551 {
1552         struct ip_sf_list *psf;
1553         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1554
1555         for (psf=pmc->sources; psf; psf=psf->sf_next)
1556                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1557                         psf->sf_oldin = mca_xcount ==
1558                                 psf->sf_count[MCAST_EXCLUDE] &&
1559                                 !psf->sf_count[MCAST_INCLUDE];
1560                 } else
1561                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1562 }
1563
1564 static int sf_setstate(struct ip_mc_list *pmc)
1565 {
1566         struct ip_sf_list *psf, *dpsf;
1567         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1568         int qrv = pmc->interface->mr_qrv;
1569         int new_in, rv;
1570
1571         rv = 0;
1572         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1573                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1574                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1575                                 !psf->sf_count[MCAST_INCLUDE];
1576                 } else
1577                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1578                 if (new_in) {
1579                         if (!psf->sf_oldin) {
1580                                 struct ip_sf_list *prev = NULL;
1581
1582                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1583                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1584                                                 break;
1585                                         prev = dpsf;
1586                                 }
1587                                 if (dpsf) {
1588                                         if (prev)
1589                                                 prev->sf_next = dpsf->sf_next;
1590                                         else
1591                                                 pmc->tomb = dpsf->sf_next;
1592                                         kfree(dpsf);
1593                                 }
1594                                 psf->sf_crcount = qrv;
1595                                 rv++;
1596                         }
1597                 } else if (psf->sf_oldin) {
1598
1599                         psf->sf_crcount = 0;
1600                         /*
1601                          * add or update "delete" records if an active filter
1602                          * is now inactive
1603                          */
1604                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1605                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1606                                         break;
1607                         if (!dpsf) {
1608                                 dpsf = (struct ip_sf_list *)
1609                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1610                                 if (!dpsf)
1611                                         continue;
1612                                 *dpsf = *psf;
1613                                 /* pmc->lock held by callers */
1614                                 dpsf->sf_next = pmc->tomb;
1615                                 pmc->tomb = dpsf;
1616                         }
1617                         dpsf->sf_crcount = qrv;
1618                         rv++;
1619                 }
1620         }
1621         return rv;
1622 }
1623 #endif
1624
1625 /*
1626  * Add multicast source filter list to the interface list
1627  */
1628 static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
1629                          int sfcount, __u32 *psfsrc, int delta)
1630 {
1631         struct ip_mc_list *pmc;
1632         int     isexclude;
1633         int     i, err;
1634
1635         if (!in_dev)
1636                 return -ENODEV;
1637         read_lock(&in_dev->mc_list_lock);
1638         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1639                 if (*pmca == pmc->multiaddr)
1640                         break;
1641         }
1642         if (!pmc) {
1643                 /* MCA not found?? bug */
1644                 read_unlock(&in_dev->mc_list_lock);
1645                 return -ESRCH;
1646         }
1647         spin_lock_bh(&pmc->lock);
1648         read_unlock(&in_dev->mc_list_lock);
1649
1650 #ifdef CONFIG_IP_MULTICAST
1651         sf_markstate(pmc);
1652 #endif
1653         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1654         if (!delta)
1655                 pmc->sfcount[sfmode]++;
1656         err = 0;
1657         for (i=0; i<sfcount; i++) {
1658                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1659                 if (err)
1660                         break;
1661         }
1662         if (err) {
1663                 int j;
1664
1665                 pmc->sfcount[sfmode]--;
1666                 for (j=0; j<i; j++)
1667                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1668         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1669 #ifdef CONFIG_IP_MULTICAST
1670                 struct in_device *in_dev = pmc->interface;
1671                 struct ip_sf_list *psf;
1672 #endif
1673
1674                 /* filter mode change */
1675                 if (pmc->sfcount[MCAST_EXCLUDE])
1676                         pmc->sfmode = MCAST_EXCLUDE;
1677                 else if (pmc->sfcount[MCAST_INCLUDE])
1678                         pmc->sfmode = MCAST_INCLUDE;
1679 #ifdef CONFIG_IP_MULTICAST
1680                 /* else no filters; keep old mode for reports */
1681
1682                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1683                         IGMP_Unsolicited_Report_Count;
1684                 in_dev->mr_ifc_count = pmc->crcount;
1685                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1686                         psf->sf_crcount = 0;
1687                 igmp_ifc_event(in_dev);
1688         } else if (sf_setstate(pmc)) {
1689                 igmp_ifc_event(in_dev);
1690 #endif
1691         }
1692         spin_unlock_bh(&pmc->lock);
1693         return err;
1694 }
1695
1696 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1697 {
1698         struct ip_sf_list *psf, *nextpsf;
1699
1700         for (psf=pmc->tomb; psf; psf=nextpsf) {
1701                 nextpsf = psf->sf_next;
1702                 kfree(psf);
1703         }
1704         pmc->tomb = NULL;
1705         for (psf=pmc->sources; psf; psf=nextpsf) {
1706                 nextpsf = psf->sf_next;
1707                 kfree(psf);
1708         }
1709         pmc->sources = NULL;
1710         pmc->sfmode = MCAST_EXCLUDE;
1711         pmc->sfcount[MCAST_INCLUDE] = 0;
1712         pmc->sfcount[MCAST_EXCLUDE] = 1;
1713 }
1714
1715
1716 /*
1717  * Join a multicast group
1718  */
1719 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1720 {
1721         int err;
1722         u32 addr = imr->imr_multiaddr.s_addr;
1723         struct ip_mc_socklist *iml=NULL, *i;
1724         struct in_device *in_dev;
1725         struct inet_sock *inet = inet_sk(sk);
1726         int ifindex;
1727         int count = 0;
1728
1729         if (!MULTICAST(addr))
1730                 return -EINVAL;
1731
1732         rtnl_lock();
1733
1734         in_dev = ip_mc_find_dev(imr);
1735
1736         if (!in_dev) {
1737                 iml = NULL;
1738                 err = -ENODEV;
1739                 goto done;
1740         }
1741
1742         err = -EADDRINUSE;
1743         ifindex = imr->imr_ifindex;
1744         for (i = inet->mc_list; i; i = i->next) {
1745                 if (i->multi.imr_multiaddr.s_addr == addr &&
1746                     i->multi.imr_ifindex == ifindex)
1747                         goto done;
1748                 count++;
1749         }
1750         err = -ENOBUFS;
1751         if (count >= sysctl_igmp_max_memberships)
1752                 goto done;
1753         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1754         if (iml == NULL)
1755                 goto done;
1756
1757         memcpy(&iml->multi, imr, sizeof(*imr));
1758         iml->next = inet->mc_list;
1759         iml->sflist = NULL;
1760         iml->sfmode = MCAST_EXCLUDE;
1761         inet->mc_list = iml;
1762         ip_mc_inc_group(in_dev, addr);
1763         err = 0;
1764 done:
1765         rtnl_unlock();
1766         return err;
1767 }
1768
1769 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1770                            struct in_device *in_dev)
1771 {
1772         int err;
1773
1774         if (iml->sflist == 0) {
1775                 /* any-source empty exclude case */
1776                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1777                         iml->sfmode, 0, NULL, 0);
1778         }
1779         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1780                         iml->sfmode, iml->sflist->sl_count,
1781                         iml->sflist->sl_addr, 0);
1782         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1783         iml->sflist = NULL;
1784         return err;
1785 }
1786
1787 /*
1788  *      Ask a socket to leave a group.
1789  */
1790
1791 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1792 {
1793         struct inet_sock *inet = inet_sk(sk);
1794         struct ip_mc_socklist *iml, **imlp;
1795         struct in_device *in_dev;
1796         u32 group = imr->imr_multiaddr.s_addr;
1797         u32 ifindex;
1798
1799         rtnl_lock();
1800         in_dev = ip_mc_find_dev(imr);
1801         if (!in_dev) {
1802                 rtnl_unlock();
1803                 return -ENODEV;
1804         }
1805         ifindex = imr->imr_ifindex;
1806         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1807                 if (iml->multi.imr_multiaddr.s_addr == group &&
1808                     iml->multi.imr_ifindex == ifindex) {
1809                         (void) ip_mc_leave_src(sk, iml, in_dev);
1810
1811                         *imlp = iml->next;
1812
1813                         ip_mc_dec_group(in_dev, group);
1814                         rtnl_unlock();
1815                         sock_kfree_s(sk, iml, sizeof(*iml));
1816                         return 0;
1817                 }
1818         }
1819         rtnl_unlock();
1820         return -EADDRNOTAVAIL;
1821 }
1822
1823 int ip_mc_source(int add, int omode, struct sock *sk, struct
1824         ip_mreq_source *mreqs, int ifindex)
1825 {
1826         int err;
1827         struct ip_mreqn imr;
1828         u32 addr = mreqs->imr_multiaddr;
1829         struct ip_mc_socklist *pmc;
1830         struct in_device *in_dev = NULL;
1831         struct inet_sock *inet = inet_sk(sk);
1832         struct ip_sf_socklist *psl;
1833         int leavegroup = 0;
1834         int i, j, rv;
1835
1836         if (!MULTICAST(addr))
1837                 return -EINVAL;
1838
1839         rtnl_lock();
1840
1841         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1842         imr.imr_address.s_addr = mreqs->imr_interface;
1843         imr.imr_ifindex = ifindex;
1844         in_dev = ip_mc_find_dev(&imr);
1845
1846         if (!in_dev) {
1847                 err = -ENODEV;
1848                 goto done;
1849         }
1850         err = -EADDRNOTAVAIL;
1851
1852         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1853                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1854                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1855                         break;
1856         }
1857         if (!pmc) {             /* must have a prior join */
1858                 err = -EINVAL;
1859                 goto done;
1860         }
1861         /* if a source filter was set, must be the same mode as before */
1862         if (pmc->sflist) {
1863                 if (pmc->sfmode != omode) {
1864                         err = -EINVAL;
1865                         goto done;
1866                 }
1867         } else if (pmc->sfmode != omode) {
1868                 /* allow mode switches for empty-set filters */
1869                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1870                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1871                         NULL, 0);
1872                 pmc->sfmode = omode;
1873         }
1874
1875         psl = pmc->sflist;
1876         if (!add) {
1877                 if (!psl)
1878                         goto done;      /* err = -EADDRNOTAVAIL */
1879                 rv = !0;
1880                 for (i=0; i<psl->sl_count; i++) {
1881                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1882                                 sizeof(__u32));
1883                         if (rv == 0)
1884                                 break;
1885                 }
1886                 if (rv)         /* source not found */
1887                         goto done;      /* err = -EADDRNOTAVAIL */
1888
1889                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1890                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1891                         leavegroup = 1;
1892                         goto done;
1893                 }
1894
1895                 /* update the interface filter */
1896                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1897                         &mreqs->imr_sourceaddr, 1);
1898
1899                 for (j=i+1; j<psl->sl_count; j++)
1900                         psl->sl_addr[j-1] = psl->sl_addr[j];
1901                 psl->sl_count--;
1902                 err = 0;
1903                 goto done;
1904         }
1905         /* else, add a new source to the filter */
1906
1907         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1908                 err = -ENOBUFS;
1909                 goto done;
1910         }
1911         if (!psl || psl->sl_count == psl->sl_max) {
1912                 struct ip_sf_socklist *newpsl;
1913                 int count = IP_SFBLOCK;
1914
1915                 if (psl)
1916                         count += psl->sl_max;
1917                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1918                 if (!newpsl) {
1919                         err = -ENOBUFS;
1920                         goto done;
1921                 }
1922                 newpsl->sl_max = count;
1923                 newpsl->sl_count = count - IP_SFBLOCK;
1924                 if (psl) {
1925                         for (i=0; i<psl->sl_count; i++)
1926                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1927                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1928                 }
1929                 pmc->sflist = psl = newpsl;
1930         }
1931         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1932         for (i=0; i<psl->sl_count; i++) {
1933                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1934                         sizeof(__u32));
1935                 if (rv == 0)
1936                         break;
1937         }
1938         if (rv == 0)            /* address already there is an error */
1939                 goto done;
1940         for (j=psl->sl_count-1; j>=i; j--)
1941                 psl->sl_addr[j+1] = psl->sl_addr[j];
1942         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1943         psl->sl_count++;
1944         err = 0;
1945         /* update the interface list */
1946         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1947                 &mreqs->imr_sourceaddr, 1);
1948 done:
1949         rtnl_unlock();
1950         if (leavegroup)
1951                 return ip_mc_leave_group(sk, &imr);
1952         return err;
1953 }
1954
1955 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1956 {
1957         int err = 0;
1958         struct ip_mreqn imr;
1959         u32 addr = msf->imsf_multiaddr;
1960         struct ip_mc_socklist *pmc;
1961         struct in_device *in_dev;
1962         struct inet_sock *inet = inet_sk(sk);
1963         struct ip_sf_socklist *newpsl, *psl;
1964         int leavegroup = 0;
1965
1966         if (!MULTICAST(addr))
1967                 return -EINVAL;
1968         if (msf->imsf_fmode != MCAST_INCLUDE &&
1969             msf->imsf_fmode != MCAST_EXCLUDE)
1970                 return -EINVAL;
1971
1972         rtnl_lock();
1973
1974         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1975         imr.imr_address.s_addr = msf->imsf_interface;
1976         imr.imr_ifindex = ifindex;
1977         in_dev = ip_mc_find_dev(&imr);
1978
1979         if (!in_dev) {
1980                 err = -ENODEV;
1981                 goto done;
1982         }
1983
1984         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1985         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
1986                 leavegroup = 1;
1987                 goto done;
1988         }
1989
1990         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1991                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
1992                     pmc->multi.imr_ifindex == imr.imr_ifindex)
1993                         break;
1994         }
1995         if (!pmc) {             /* must have a prior join */
1996                 err = -EINVAL;
1997                 goto done;
1998         }
1999         if (msf->imsf_numsrc) {
2000                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2001                                                            GFP_KERNEL);
2002                 if (!newpsl) {
2003                         err = -ENOBUFS;
2004                         goto done;
2005                 }
2006                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2007                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2008                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2009                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2010                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2011                 if (err) {
2012                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2013                         goto done;
2014                 }
2015         } else {
2016                 newpsl = NULL;
2017                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2018                                      msf->imsf_fmode, 0, NULL, 0);
2019         }
2020         psl = pmc->sflist;
2021         if (psl) {
2022                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2023                         psl->sl_count, psl->sl_addr, 0);
2024                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2025         } else
2026                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2027                         0, NULL, 0);
2028         pmc->sflist = newpsl;
2029         pmc->sfmode = msf->imsf_fmode;
2030         err = 0;
2031 done:
2032         rtnl_unlock();
2033         if (leavegroup)
2034                 err = ip_mc_leave_group(sk, &imr);
2035         return err;
2036 }
2037
2038 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2039         struct ip_msfilter __user *optval, int __user *optlen)
2040 {
2041         int err, len, count, copycount;
2042         struct ip_mreqn imr;
2043         u32 addr = msf->imsf_multiaddr;
2044         struct ip_mc_socklist *pmc;
2045         struct in_device *in_dev;
2046         struct inet_sock *inet = inet_sk(sk);
2047         struct ip_sf_socklist *psl;
2048
2049         if (!MULTICAST(addr))
2050                 return -EINVAL;
2051
2052         rtnl_lock();
2053
2054         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2055         imr.imr_address.s_addr = msf->imsf_interface;
2056         imr.imr_ifindex = 0;
2057         in_dev = ip_mc_find_dev(&imr);
2058
2059         if (!in_dev) {
2060                 err = -ENODEV;
2061                 goto done;
2062         }
2063         err = -EADDRNOTAVAIL;
2064
2065         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2066                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2067                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2068                         break;
2069         }
2070         if (!pmc)               /* must have a prior join */
2071                 goto done;
2072         msf->imsf_fmode = pmc->sfmode;
2073         psl = pmc->sflist;
2074         rtnl_unlock();
2075         if (!psl) {
2076                 len = 0;
2077                 count = 0;
2078         } else {
2079                 count = psl->sl_count;
2080         }
2081         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2082         len = copycount * sizeof(psl->sl_addr[0]);
2083         msf->imsf_numsrc = count;
2084         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2085             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2086                 return -EFAULT;
2087         }
2088         if (len &&
2089             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2090                 return -EFAULT;
2091         return 0;
2092 done:
2093         rtnl_unlock();
2094         return err;
2095 }
2096
2097 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2098         struct group_filter __user *optval, int __user *optlen)
2099 {
2100         int err, i, count, copycount;
2101         struct sockaddr_in *psin;
2102         u32 addr;
2103         struct ip_mc_socklist *pmc;
2104         struct inet_sock *inet = inet_sk(sk);
2105         struct ip_sf_socklist *psl;
2106
2107         psin = (struct sockaddr_in *)&gsf->gf_group;
2108         if (psin->sin_family != AF_INET)
2109                 return -EINVAL;
2110         addr = psin->sin_addr.s_addr;
2111         if (!MULTICAST(addr))
2112                 return -EINVAL;
2113
2114         rtnl_lock();
2115
2116         err = -EADDRNOTAVAIL;
2117
2118         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2119                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2120                     pmc->multi.imr_ifindex == gsf->gf_interface)
2121                         break;
2122         }
2123         if (!pmc)               /* must have a prior join */
2124                 goto done;
2125         gsf->gf_fmode = pmc->sfmode;
2126         psl = pmc->sflist;
2127         rtnl_unlock();
2128         count = psl ? psl->sl_count : 0;
2129         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2130         gsf->gf_numsrc = count;
2131         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2132             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2133                 return -EFAULT;
2134         }
2135         for (i=0; i<copycount; i++) {
2136                 struct sockaddr_in *psin;
2137                 struct sockaddr_storage ss;
2138
2139                 psin = (struct sockaddr_in *)&ss;
2140                 memset(&ss, 0, sizeof(ss));
2141                 psin->sin_family = AF_INET;
2142                 psin->sin_addr.s_addr = psl->sl_addr[i];
2143                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2144                         return -EFAULT;
2145         }
2146         return 0;
2147 done:
2148         rtnl_unlock();
2149         return err;
2150 }
2151
2152 /*
2153  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2154  */
2155 int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif)
2156 {
2157         struct inet_sock *inet = inet_sk(sk);
2158         struct ip_mc_socklist *pmc;
2159         struct ip_sf_socklist *psl;
2160         int i;
2161
2162         if (!MULTICAST(loc_addr))
2163                 return 1;
2164
2165         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2166                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2167                     pmc->multi.imr_ifindex == dif)
2168                         break;
2169         }
2170         if (!pmc)
2171                 return 1;
2172         psl = pmc->sflist;
2173         if (!psl)
2174                 return pmc->sfmode == MCAST_EXCLUDE;
2175
2176         for (i=0; i<psl->sl_count; i++) {
2177                 if (psl->sl_addr[i] == rmt_addr)
2178                         break;
2179         }
2180         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2181                 return 0;
2182         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2183                 return 0;
2184         return 1;
2185 }
2186
2187 /*
2188  *      A socket is closing.
2189  */
2190
2191 void ip_mc_drop_socket(struct sock *sk)
2192 {
2193         struct inet_sock *inet = inet_sk(sk);
2194         struct ip_mc_socklist *iml;
2195
2196         if (inet->mc_list == NULL)
2197                 return;
2198
2199         rtnl_lock();
2200         while ((iml = inet->mc_list) != NULL) {
2201                 struct in_device *in_dev;
2202                 inet->mc_list = iml->next;
2203
2204                 if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) {
2205                         (void) ip_mc_leave_src(sk, iml, in_dev);
2206                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2207                         in_dev_put(in_dev);
2208                 }
2209                 sock_kfree_s(sk, iml, sizeof(*iml));
2210
2211         }
2212         rtnl_unlock();
2213 }
2214
2215 int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto)
2216 {
2217         struct ip_mc_list *im;
2218         struct ip_sf_list *psf;
2219         int rv = 0;
2220
2221         read_lock(&in_dev->mc_list_lock);
2222         for (im=in_dev->mc_list; im; im=im->next) {
2223                 if (im->multiaddr == mc_addr)
2224                         break;
2225         }
2226         if (im && proto == IPPROTO_IGMP) {
2227                 rv = 1;
2228         } else if (im) {
2229                 if (src_addr) {
2230                         for (psf=im->sources; psf; psf=psf->sf_next) {
2231                                 if (psf->sf_inaddr == src_addr)
2232                                         break;
2233                         }
2234                         if (psf)
2235                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2236                                         psf->sf_count[MCAST_EXCLUDE] !=
2237                                         im->sfcount[MCAST_EXCLUDE];
2238                         else
2239                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2240                 } else
2241                         rv = 1; /* unspecified source; tentatively allow */
2242         }
2243         read_unlock(&in_dev->mc_list_lock);
2244         return rv;
2245 }
2246
2247 #if defined(CONFIG_PROC_FS)
2248 struct igmp_mc_iter_state {
2249         struct net_device *dev;
2250         struct in_device *in_dev;
2251 };
2252
2253 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2254
2255 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2256 {
2257         struct ip_mc_list *im = NULL;
2258         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2259
2260         for (state->dev = dev_base, state->in_dev = NULL;
2261              state->dev;
2262              state->dev = state->dev->next) {
2263                 struct in_device *in_dev;
2264                 in_dev = in_dev_get(state->dev);
2265                 if (!in_dev)
2266                         continue;
2267                 read_lock(&in_dev->mc_list_lock);
2268                 im = in_dev->mc_list;
2269                 if (im) {
2270                         state->in_dev = in_dev;
2271                         break;
2272                 }
2273                 read_unlock(&in_dev->mc_list_lock);
2274                 in_dev_put(in_dev);
2275         }
2276         return im;
2277 }
2278
2279 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2280 {
2281         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2282         im = im->next;
2283         while (!im) {
2284                 if (likely(state->in_dev != NULL)) {
2285                         read_unlock(&state->in_dev->mc_list_lock);
2286                         in_dev_put(state->in_dev);
2287                 }
2288                 state->dev = state->dev->next;
2289                 if (!state->dev) {
2290                         state->in_dev = NULL;
2291                         break;
2292                 }
2293                 state->in_dev = in_dev_get(state->dev);
2294                 if (!state->in_dev)
2295                         continue;
2296                 read_lock(&state->in_dev->mc_list_lock);
2297                 im = state->in_dev->mc_list;
2298         }
2299         return im;
2300 }
2301
2302 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2303 {
2304         struct ip_mc_list *im = igmp_mc_get_first(seq);
2305         if (im)
2306                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2307                         --pos;
2308         return pos ? NULL : im;
2309 }
2310
2311 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2312 {
2313         read_lock(&dev_base_lock);
2314         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2315 }
2316
2317 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2318 {
2319         struct ip_mc_list *im;
2320         if (v == SEQ_START_TOKEN)
2321                 im = igmp_mc_get_first(seq);
2322         else
2323                 im = igmp_mc_get_next(seq, v);
2324         ++*pos;
2325         return im;
2326 }
2327
2328 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2329 {
2330         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2331         if (likely(state->in_dev != NULL)) {
2332                 read_unlock(&state->in_dev->mc_list_lock);
2333                 in_dev_put(state->in_dev);
2334                 state->in_dev = NULL;
2335         }
2336         state->dev = NULL;
2337         read_unlock(&dev_base_lock);
2338 }
2339
2340 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2341 {
2342         if (v == SEQ_START_TOKEN)
2343                 seq_puts(seq,
2344                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2345         else {
2346                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2347                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2348                 char   *querier;
2349 #ifdef CONFIG_IP_MULTICAST
2350                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2351                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2352                           "V3";
2353 #else
2354                 querier = "NONE";
2355 #endif
2356
2357                 if (state->in_dev->mc_list == im) {
2358                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2359                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2360                 }
2361
2362                 seq_printf(seq,
2363                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2364                            im->multiaddr, im->users,
2365                            im->tm_running, im->tm_running ?
2366                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2367                            im->reporter);
2368         }
2369         return 0;
2370 }
2371
2372 static struct seq_operations igmp_mc_seq_ops = {
2373         .start  =       igmp_mc_seq_start,
2374         .next   =       igmp_mc_seq_next,
2375         .stop   =       igmp_mc_seq_stop,
2376         .show   =       igmp_mc_seq_show,
2377 };
2378
2379 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2380 {
2381         struct seq_file *seq;
2382         int rc = -ENOMEM;
2383         struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2384
2385         if (!s)
2386                 goto out;
2387         rc = seq_open(file, &igmp_mc_seq_ops);
2388         if (rc)
2389                 goto out_kfree;
2390
2391         seq = file->private_data;
2392         seq->private = s;
2393         memset(s, 0, sizeof(*s));
2394 out:
2395         return rc;
2396 out_kfree:
2397         kfree(s);
2398         goto out;
2399 }
2400
2401 static struct file_operations igmp_mc_seq_fops = {
2402         .owner          =       THIS_MODULE,
2403         .open           =       igmp_mc_seq_open,
2404         .read           =       seq_read,
2405         .llseek         =       seq_lseek,
2406         .release        =       seq_release_private,
2407 };
2408
2409 struct igmp_mcf_iter_state {
2410         struct net_device *dev;
2411         struct in_device *idev;
2412         struct ip_mc_list *im;
2413 };
2414
2415 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2416
2417 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2418 {
2419         struct ip_sf_list *psf = NULL;
2420         struct ip_mc_list *im = NULL;
2421         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2422
2423         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2424              state->dev;
2425              state->dev = state->dev->next) {
2426                 struct in_device *idev;
2427                 idev = in_dev_get(state->dev);
2428                 if (unlikely(idev == NULL))
2429                         continue;
2430                 read_lock(&idev->mc_list_lock);
2431                 im = idev->mc_list;
2432                 if (likely(im != NULL)) {
2433                         spin_lock_bh(&im->lock);
2434                         psf = im->sources;
2435                         if (likely(psf != NULL)) {
2436                                 state->im = im;
2437                                 state->idev = idev;
2438                                 break;
2439                         }
2440                         spin_unlock_bh(&im->lock);
2441                 }
2442                 read_unlock(&idev->mc_list_lock);
2443                 in_dev_put(idev);
2444         }
2445         return psf;
2446 }
2447
2448 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2449 {
2450         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2451
2452         psf = psf->sf_next;
2453         while (!psf) {
2454                 spin_unlock_bh(&state->im->lock);
2455                 state->im = state->im->next;
2456                 while (!state->im) {
2457                         if (likely(state->idev != NULL)) {
2458                                 read_unlock(&state->idev->mc_list_lock);
2459                                 in_dev_put(state->idev);
2460                         }
2461                         state->dev = state->dev->next;
2462                         if (!state->dev) {
2463                                 state->idev = NULL;
2464                                 goto out;
2465                         }
2466                         state->idev = in_dev_get(state->dev);
2467                         if (!state->idev)
2468                                 continue;
2469                         read_lock(&state->idev->mc_list_lock);
2470                         state->im = state->idev->mc_list;
2471                 }
2472                 if (!state->im)
2473                         break;
2474                 spin_lock_bh(&state->im->lock);
2475                 psf = state->im->sources;
2476         }
2477 out:
2478         return psf;
2479 }
2480
2481 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2482 {
2483         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2484         if (psf)
2485                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2486                         --pos;
2487         return pos ? NULL : psf;
2488 }
2489
2490 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2491 {
2492         read_lock(&dev_base_lock);
2493         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2494 }
2495
2496 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2497 {
2498         struct ip_sf_list *psf;
2499         if (v == SEQ_START_TOKEN)
2500                 psf = igmp_mcf_get_first(seq);
2501         else
2502                 psf = igmp_mcf_get_next(seq, v);
2503         ++*pos;
2504         return psf;
2505 }
2506
2507 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2508 {
2509         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2510         if (likely(state->im != NULL)) {
2511                 spin_unlock_bh(&state->im->lock);
2512                 state->im = NULL;
2513         }
2514         if (likely(state->idev != NULL)) {
2515                 read_unlock(&state->idev->mc_list_lock);
2516                 in_dev_put(state->idev);
2517                 state->idev = NULL;
2518         }
2519         state->dev = NULL;
2520         read_unlock(&dev_base_lock);
2521 }
2522
2523 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2524 {
2525         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2526         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2527
2528         if (v == SEQ_START_TOKEN) {
2529                 seq_printf(seq,
2530                            "%3s %6s "
2531                            "%10s %10s %6s %6s\n", "Idx",
2532                            "Device", "MCA",
2533                            "SRC", "INC", "EXC");
2534         } else {
2535                 seq_printf(seq,
2536                            "%3d %6.6s 0x%08x "
2537                            "0x%08x %6lu %6lu\n",
2538                            state->dev->ifindex, state->dev->name,
2539                            ntohl(state->im->multiaddr),
2540                            ntohl(psf->sf_inaddr),
2541                            psf->sf_count[MCAST_INCLUDE],
2542                            psf->sf_count[MCAST_EXCLUDE]);
2543         }
2544         return 0;
2545 }
2546
2547 static struct seq_operations igmp_mcf_seq_ops = {
2548         .start  =       igmp_mcf_seq_start,
2549         .next   =       igmp_mcf_seq_next,
2550         .stop   =       igmp_mcf_seq_stop,
2551         .show   =       igmp_mcf_seq_show,
2552 };
2553
2554 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2555 {
2556         struct seq_file *seq;
2557         int rc = -ENOMEM;
2558         struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2559
2560         if (!s)
2561                 goto out;
2562         rc = seq_open(file, &igmp_mcf_seq_ops);
2563         if (rc)
2564                 goto out_kfree;
2565
2566         seq = file->private_data;
2567         seq->private = s;
2568         memset(s, 0, sizeof(*s));
2569 out:
2570         return rc;
2571 out_kfree:
2572         kfree(s);
2573         goto out;
2574 }
2575
2576 static struct file_operations igmp_mcf_seq_fops = {
2577         .owner          =       THIS_MODULE,
2578         .open           =       igmp_mcf_seq_open,
2579         .read           =       seq_read,
2580         .llseek         =       seq_lseek,
2581         .release        =       seq_release_private,
2582 };
2583
2584 int __init igmp_mc_proc_init(void)
2585 {
2586         proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2587         proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2588         return 0;
2589 }
2590 #endif
2591
2592 EXPORT_SYMBOL(ip_mc_dec_group);
2593 EXPORT_SYMBOL(ip_mc_inc_group);
2594 EXPORT_SYMBOL(ip_mc_join_group);