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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, __be32 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, __be32 *pmca, int sfmode,
 148                          int sfcount, __be32 *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                 __be32 *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(__be32) +
 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                 if (!skb)
 459                         return NULL;
 460                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 461                 *psrc = psf->sf_inaddr;
 462                 scount++; stotal++;
 463                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 464                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 465                         psf->sf_crcount--;
 466                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 467                                 if (psf_prev)
 468                                         psf_prev->sf_next = psf->sf_next;
 469                                 else
 470                                         *psf_list = psf->sf_next;
 471                                 kfree(psf);
 472                                 continue;
 473                         }
 474                 }
 475                 psf_prev = psf;
 476         }
 477
 478 empty_source:
 479         if (!stotal) {
 480                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 481                     type == IGMPV3_BLOCK_OLD_SOURCES)
 482                         return skb;
 483                 if (pmc->crcount || isquery) {
 484                         /* make sure we have room for group header */
 485                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 486                                 igmpv3_sendpack(skb);
 487                                 skb = NULL; /* add_grhead will get a new one */
 488                         }
 489                         skb = add_grhead(skb, pmc, type, &pgr);
 490                 }
 491         }
 492         if (pgr)
 493                 pgr->grec_nsrcs = htons(scount);
 494
 495         if (isquery)
 496                 pmc->gsquery = 0;       /* clear query state on report */
 497         return skb;
 498 }
 499
 500 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 501 {
 502         struct sk_buff *skb = NULL;
 503         int type;
 504
 505         if (!pmc) {
 506                 read_lock(&in_dev->mc_list_lock);
 507                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 508                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 509                                 continue;
 510                         spin_lock_bh(&pmc->lock);
 511                         if (pmc->sfcount[MCAST_EXCLUDE])
 512                                 type = IGMPV3_MODE_IS_EXCLUDE;
 513                         else
 514                                 type = IGMPV3_MODE_IS_INCLUDE;
 515                         skb = add_grec(skb, pmc, type, 0, 0);
 516                         spin_unlock_bh(&pmc->lock);
 517                 }
 518                 read_unlock(&in_dev->mc_list_lock);
 519         } else {
 520                 spin_lock_bh(&pmc->lock);
 521                 if (pmc->sfcount[MCAST_EXCLUDE])
 522                         type = IGMPV3_MODE_IS_EXCLUDE;
 523                 else
 524                         type = IGMPV3_MODE_IS_INCLUDE;
 525                 skb = add_grec(skb, pmc, type, 0, 0);
 526                 spin_unlock_bh(&pmc->lock);
 527         }
 528         if (!skb)
 529                 return 0;
 530         return igmpv3_sendpack(skb);
 531 }
 532
 533 /*
 534  * remove zero-count source records from a source filter list
 535  */
 536 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 537 {
 538         struct ip_sf_list *psf_prev, *psf_next, *psf;
 539
 540         psf_prev = NULL;
 541         for (psf=*ppsf; psf; psf = psf_next) {
 542                 psf_next = psf->sf_next;
 543                 if (psf->sf_crcount == 0) {
 544                         if (psf_prev)
 545                                 psf_prev->sf_next = psf->sf_next;
 546                         else
 547                                 *ppsf = psf->sf_next;
 548                         kfree(psf);
 549                 } else
 550                         psf_prev = psf;
 551         }
 552 }
 553
 554 static void igmpv3_send_cr(struct in_device *in_dev)
 555 {
 556         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 557         struct sk_buff *skb = NULL;
 558         int type, dtype;
 559
 560         read_lock(&in_dev->mc_list_lock);
 561         spin_lock_bh(&in_dev->mc_tomb_lock);
 562
 563         /* deleted MCA's */
 564         pmc_prev = NULL;
 565         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 566                 pmc_next = pmc->next;
 567                 if (pmc->sfmode == MCAST_INCLUDE) {
 568                         type = IGMPV3_BLOCK_OLD_SOURCES;
 569                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 570                         skb = add_grec(skb, pmc, type, 1, 0);
 571                         skb = add_grec(skb, pmc, dtype, 1, 1);
 572                 }
 573                 if (pmc->crcount) {
 574                         if (pmc->sfmode == MCAST_EXCLUDE) {
 575                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 576                                 skb = add_grec(skb, pmc, type, 1, 0);
 577                         }
 578                         pmc->crcount--;
 579                         if (pmc->crcount == 0) {
 580                                 igmpv3_clear_zeros(&pmc->tomb);
 581                                 igmpv3_clear_zeros(&pmc->sources);
 582                         }
 583                 }
 584                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 585                         if (pmc_prev)
 586                                 pmc_prev->next = pmc_next;
 587                         else
 588                                 in_dev->mc_tomb = pmc_next;
 589                         in_dev_put(pmc->interface);
 590                         kfree(pmc);
 591                 } else
 592                         pmc_prev = pmc;
 593         }
 594         spin_unlock_bh(&in_dev->mc_tomb_lock);
 595
 596         /* change recs */
 597         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 598                 spin_lock_bh(&pmc->lock);
 599                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 600                         type = IGMPV3_BLOCK_OLD_SOURCES;
 601                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 602                 } else {
 603                         type = IGMPV3_ALLOW_NEW_SOURCES;
 604                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 605                 }
 606                 skb = add_grec(skb, pmc, type, 0, 0);
 607                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 608
 609                 /* filter mode changes */
 610                 if (pmc->crcount) {
 611                         if (pmc->sfmode == MCAST_EXCLUDE)
 612                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 613                         else
 614                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 615                         skb = add_grec(skb, pmc, type, 0, 0);
 616                         pmc->crcount--;
 617                 }
 618                 spin_unlock_bh(&pmc->lock);
 619         }
 620         read_unlock(&in_dev->mc_list_lock);
 621
 622         if (!skb)
 623                 return;
 624         (void) igmpv3_sendpack(skb);
 625 }
 626
 627 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 628         int type)
 629 {
 630         struct sk_buff *skb;
 631         struct iphdr *iph;
 632         struct igmphdr *ih;
 633         struct rtable *rt;
 634         struct net_device *dev = in_dev->dev;
 635         __be32  group = pmc ? pmc->multiaddr : 0;
 636         __be32  dst;
 637
 638         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 639                 return igmpv3_send_report(in_dev, pmc);
 640         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 641                 dst = IGMP_ALL_ROUTER;
 642         else
 643                 dst = group;
 644
 645         {
 646                 struct flowi fl = { .oif = dev->ifindex,
 647                                     .nl_u = { .ip4_u = { .daddr = dst } },
 648                                     .proto = IPPROTO_IGMP };
 649                 if (ip_route_output_key(&rt, &fl))
 650                         return -1;
 651         }
 652         if (rt->rt_src == 0) {
 653                 ip_rt_put(rt);
 654                 return -1;
 655         }
 656
 657         skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 658         if (skb == NULL) {
 659                 ip_rt_put(rt);
 660                 return -1;
 661         }
 662
 663         skb->dst = &rt->u.dst;
 664
 665         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 666
 667         skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4);
 668
 669         iph->version  = 4;
 670         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 671         iph->tos      = 0xc0;
 672         iph->frag_off = htons(IP_DF);
 673         iph->ttl      = 1;
 674         iph->daddr    = dst;
 675         iph->saddr    = rt->rt_src;
 676         iph->protocol = IPPROTO_IGMP;
 677         iph->tot_len  = htons(IGMP_SIZE);
 678         ip_select_ident(iph, &rt->u.dst, NULL);
 679         ((u8*)&iph[1])[0] = IPOPT_RA;
 680         ((u8*)&iph[1])[1] = 4;
 681         ((u8*)&iph[1])[2] = 0;
 682         ((u8*)&iph[1])[3] = 0;
 683         ip_send_check(iph);
 684
 685         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 686         ih->type=type;
 687         ih->code=0;
 688         ih->csum=0;
 689         ih->group=group;
 690         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 691
 692         return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
 693                        dst_output);
 694 }
 695
 696 static void igmp_gq_timer_expire(unsigned long data)
 697 {
 698         struct in_device *in_dev = (struct in_device *)data;
 699
 700         in_dev->mr_gq_running = 0;
 701         igmpv3_send_report(in_dev, NULL);
 702         __in_dev_put(in_dev);
 703 }
 704
 705 static void igmp_ifc_timer_expire(unsigned long data)
 706 {
 707         struct in_device *in_dev = (struct in_device *)data;
 708
 709         igmpv3_send_cr(in_dev);
 710         if (in_dev->mr_ifc_count) {
 711                 in_dev->mr_ifc_count--;
 712                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 713         }
 714         __in_dev_put(in_dev);
 715 }
 716
 717 static void igmp_ifc_event(struct in_device *in_dev)
 718 {
 719         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 720                 return;
 721         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 722                 IGMP_Unsolicited_Report_Count;
 723         igmp_ifc_start_timer(in_dev, 1);
 724 }
 725
 726
 727 static void igmp_timer_expire(unsigned long data)
 728 {
 729         struct ip_mc_list *im=(struct ip_mc_list *)data;
 730         struct in_device *in_dev = im->interface;
 731
 732         spin_lock(&im->lock);
 733         im->tm_running=0;
 734
 735         if (im->unsolicit_count) {
 736                 im->unsolicit_count--;
 737                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 738         }
 739         im->reporter = 1;
 740         spin_unlock(&im->lock);
 741
 742         if (IGMP_V1_SEEN(in_dev))
 743                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 744         else if (IGMP_V2_SEEN(in_dev))
 745                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 746         else
 747                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 748
 749         ip_ma_put(im);
 750 }
 751
 752 /* mark EXCLUDE-mode sources */
 753 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 754 {
 755         struct ip_sf_list *psf;
 756         int i, scount;
 757
 758         scount = 0;
 759         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 760                 if (scount == nsrcs)
 761                         break;
 762                 for (i=0; i<nsrcs; i++) {
 763                         /* skip inactive filters */
 764                         if (pmc->sfcount[MCAST_INCLUDE] ||
 765                             pmc->sfcount[MCAST_EXCLUDE] !=
 766                             psf->sf_count[MCAST_EXCLUDE])
 767                                 continue;
 768                         if (srcs[i] == psf->sf_inaddr) {
 769                                 scount++;
 770                                 break;
 771                         }
 772                 }
 773         }
 774         pmc->gsquery = 0;
 775         if (scount == nsrcs)    /* all sources excluded */
 776                 return 0;
 777         return 1;
 778 }
 779
 780 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 781 {
 782         struct ip_sf_list *psf;
 783         int i, scount;
 784
 785         if (pmc->sfmode == MCAST_EXCLUDE)
 786                 return igmp_xmarksources(pmc, nsrcs, srcs);
 787
 788         /* mark INCLUDE-mode sources */
 789         scount = 0;
 790         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 791                 if (scount == nsrcs)
 792                         break;
 793                 for (i=0; i<nsrcs; i++)
 794                         if (srcs[i] == psf->sf_inaddr) {
 795                                 psf->sf_gsresp = 1;
 796                                 scount++;
 797                                 break;
 798                         }
 799         }
 800         if (!scount) {
 801                 pmc->gsquery = 0;
 802                 return 0;
 803         }
 804         pmc->gsquery = 1;
 805         return 1;
 806 }
 807
 808 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 809 {
 810         struct ip_mc_list *im;
 811
 812         /* Timers are only set for non-local groups */
 813
 814         if (group == IGMP_ALL_HOSTS)
 815                 return;
 816
 817         read_lock(&in_dev->mc_list_lock);
 818         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 819                 if (im->multiaddr == group) {
 820                         igmp_stop_timer(im);
 821                         break;
 822                 }
 823         }
 824         read_unlock(&in_dev->mc_list_lock);
 825 }
 826
 827 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 828         int len)
 829 {
 830         struct igmphdr          *ih = skb->h.igmph;
 831         struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
 832         struct ip_mc_list       *im;
 833         __be32                  group = ih->group;
 834         int                     max_delay;
 835         int                     mark = 0;
 836
 837
 838         if (len == 8) {
 839                 if (ih->code == 0) {
 840                         /* Alas, old v1 router presents here. */
 841
 842                         max_delay = IGMP_Query_Response_Interval;
 843                         in_dev->mr_v1_seen = jiffies +
 844                                 IGMP_V1_Router_Present_Timeout;
 845                         group = 0;
 846                 } else {
 847                         /* v2 router present */
 848                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 849                         in_dev->mr_v2_seen = jiffies +
 850                                 IGMP_V2_Router_Present_Timeout;
 851                 }
 852                 /* cancel the interface change timer */
 853                 in_dev->mr_ifc_count = 0;
 854                 if (del_timer(&in_dev->mr_ifc_timer))
 855                         __in_dev_put(in_dev);
 856                 /* clear deleted report items */
 857                 igmpv3_clear_delrec(in_dev);
 858         } else if (len < 12) {
 859                 return; /* ignore bogus packet; freed by caller */
 860         } else { /* v3 */
 861                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 862                         return;
 863
 864                 ih3 = (struct igmpv3_query *) skb->h.raw;
 865                 if (ih3->nsrcs) {
 866                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 867                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 868                                 return;
 869                         ih3 = (struct igmpv3_query *) skb->h.raw;
 870                 }
 871
 872                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 873                 if (!max_delay)
 874                         max_delay = 1;  /* can't mod w/ 0 */
 875                 in_dev->mr_maxdelay = max_delay;
 876                 if (ih3->qrv)
 877                         in_dev->mr_qrv = ih3->qrv;
 878                 if (!group) { /* general query */
 879                         if (ih3->nsrcs)
 880                                 return; /* no sources allowed */
 881                         igmp_gq_start_timer(in_dev);
 882                         return;
 883                 }
 884                 /* mark sources to include, if group & source-specific */
 885                 mark = ih3->nsrcs != 0;
 886         }
 887
 888         /*
 889          * - Start the timers in all of our membership records
 890          *   that the query applies to for the interface on
 891          *   which the query arrived excl. those that belong
 892          *   to a "local" group (224.0.0.X)
 893          * - For timers already running check if they need to
 894          *   be reset.
 895          * - Use the igmp->igmp_code field as the maximum
 896          *   delay possible
 897          */
 898         read_lock(&in_dev->mc_list_lock);
 899         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 900                 int changed;
 901
 902                 if (group && group != im->multiaddr)
 903                         continue;
 904                 if (im->multiaddr == IGMP_ALL_HOSTS)
 905                         continue;
 906                 spin_lock_bh(&im->lock);
 907                 if (im->tm_running)
 908                         im->gsquery = im->gsquery && mark;
 909                 else
 910                         im->gsquery = mark;
 911                 changed = !im->gsquery ||
 912                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 913                 spin_unlock_bh(&im->lock);
 914                 if (changed)
 915                         igmp_mod_timer(im, max_delay);
 916         }
 917         read_unlock(&in_dev->mc_list_lock);
 918 }
 919
 920 int igmp_rcv(struct sk_buff *skb)
 921 {
 922         /* This basically follows the spec line by line -- see RFC1112 */
 923         struct igmphdr *ih;
 924         struct in_device *in_dev = in_dev_get(skb->dev);
 925         int len = skb->len;
 926
 927         if (in_dev==NULL) {
 928                 kfree_skb(skb);
 929                 return 0;
 930         }
 931
 932         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 933                 goto drop;
 934
 935         switch (skb->ip_summed) {
 936         case CHECKSUM_COMPLETE:
 937                 if (!csum_fold(skb->csum))
 938                         break;
 939                 /* fall through */
 940         case CHECKSUM_NONE:
 941                 skb->csum = 0;
 942                 if (__skb_checksum_complete(skb))
 943                         goto drop;
 944         }
 945
 946         ih = skb->h.igmph;
 947         switch (ih->type) {
 948         case IGMP_HOST_MEMBERSHIP_QUERY:
 949                 igmp_heard_query(in_dev, skb, len);
 950                 break;
 951         case IGMP_HOST_MEMBERSHIP_REPORT:
 952         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 953         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 954                 /* Is it our report looped back? */
 955                 if (((struct rtable*)skb->dst)->fl.iif == 0)
 956                         break;
 957                 /* don't rely on MC router hearing unicast reports */
 958                 if (skb->pkt_type == PACKET_MULTICAST ||
 959                     skb->pkt_type == PACKET_BROADCAST)
 960                         igmp_heard_report(in_dev, ih->group);
 961                 break;
 962         case IGMP_PIM:
 963 #ifdef CONFIG_IP_PIMSM_V1
 964                 in_dev_put(in_dev);
 965                 return pim_rcv_v1(skb);
 966 #endif
 967         case IGMP_DVMRP:
 968         case IGMP_TRACE:
 969         case IGMP_HOST_LEAVE_MESSAGE:
 970         case IGMP_MTRACE:
 971         case IGMP_MTRACE_RESP:
 972                 break;
 973         default:
 974                 break;
 975         }
 976
 977 drop:
 978         in_dev_put(in_dev);
 979         kfree_skb(skb);
 980         return 0;
 981 }
 982
 983 #endif
 984
 985
 986 /*
 987  *      Add a filter to a device
 988  */
 989
 990 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 991 {
 992         char buf[MAX_ADDR_LEN];
 993         struct net_device *dev = in_dev->dev;
 994
 995         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 996            We will get multicast token leakage, when IFF_MULTICAST
 997            is changed. This check should be done in dev->set_multicast_list
 998            routine. Something sort of:
 999            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1000            --ANK
1001            */
1002         if (arp_mc_map(addr, buf, dev, 0) == 0)
1003                 dev_mc_add(dev,buf,dev->addr_len,0);
1004 }
1005
1006 /*
1007  *      Remove a filter from a device
1008  */
1009
1010 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1011 {
1012         char buf[MAX_ADDR_LEN];
1013         struct net_device *dev = in_dev->dev;
1014
1015         if (arp_mc_map(addr, buf, dev, 0) == 0)
1016                 dev_mc_delete(dev,buf,dev->addr_len,0);
1017 }
1018
1019 #ifdef CONFIG_IP_MULTICAST
1020 /*
1021  * deleted ip_mc_list manipulation
1022  */
1023 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1024 {
1025         struct ip_mc_list *pmc;
1026
1027         /* this is an "ip_mc_list" for convenience; only the fields below
1028          * are actually used. In particular, the refcnt and users are not
1029          * used for management of the delete list. Using the same structure
1030          * for deleted items allows change reports to use common code with
1031          * non-deleted or query-response MCA's.
1032          */
1033         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1034         if (!pmc)
1035                 return;
1036         spin_lock_bh(&im->lock);
1037         pmc->interface = im->interface;
1038         in_dev_hold(in_dev);
1039         pmc->multiaddr = im->multiaddr;
1040         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1041                 IGMP_Unsolicited_Report_Count;
1042         pmc->sfmode = im->sfmode;
1043         if (pmc->sfmode == MCAST_INCLUDE) {
1044                 struct ip_sf_list *psf;
1045
1046                 pmc->tomb = im->tomb;
1047                 pmc->sources = im->sources;
1048                 im->tomb = im->sources = NULL;
1049                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1050                         psf->sf_crcount = pmc->crcount;
1051         }
1052         spin_unlock_bh(&im->lock);
1053
1054         spin_lock_bh(&in_dev->mc_tomb_lock);
1055         pmc->next = in_dev->mc_tomb;
1056         in_dev->mc_tomb = pmc;
1057         spin_unlock_bh(&in_dev->mc_tomb_lock);
1058 }
1059
1060 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1061 {
1062         struct ip_mc_list *pmc, *pmc_prev;
1063         struct ip_sf_list *psf, *psf_next;
1064
1065         spin_lock_bh(&in_dev->mc_tomb_lock);
1066         pmc_prev = NULL;
1067         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1068                 if (pmc->multiaddr == multiaddr)
1069                         break;
1070                 pmc_prev = pmc;
1071         }
1072         if (pmc) {
1073                 if (pmc_prev)
1074                         pmc_prev->next = pmc->next;
1075                 else
1076                         in_dev->mc_tomb = pmc->next;
1077         }
1078         spin_unlock_bh(&in_dev->mc_tomb_lock);
1079         if (pmc) {
1080                 for (psf=pmc->tomb; psf; psf=psf_next) {
1081                         psf_next = psf->sf_next;
1082                         kfree(psf);
1083                 }
1084                 in_dev_put(pmc->interface);
1085                 kfree(pmc);
1086         }
1087 }
1088
1089 static void igmpv3_clear_delrec(struct in_device *in_dev)
1090 {
1091         struct ip_mc_list *pmc, *nextpmc;
1092
1093         spin_lock_bh(&in_dev->mc_tomb_lock);
1094         pmc = in_dev->mc_tomb;
1095         in_dev->mc_tomb = NULL;
1096         spin_unlock_bh(&in_dev->mc_tomb_lock);
1097
1098         for (; pmc; pmc = nextpmc) {
1099                 nextpmc = pmc->next;
1100                 ip_mc_clear_src(pmc);
1101                 in_dev_put(pmc->interface);
1102                 kfree(pmc);
1103         }
1104         /* clear dead sources, too */
1105         read_lock(&in_dev->mc_list_lock);
1106         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1107                 struct ip_sf_list *psf, *psf_next;
1108
1109                 spin_lock_bh(&pmc->lock);
1110                 psf = pmc->tomb;
1111                 pmc->tomb = NULL;
1112                 spin_unlock_bh(&pmc->lock);
1113                 for (; psf; psf=psf_next) {
1114                         psf_next = psf->sf_next;
1115                         kfree(psf);
1116                 }
1117         }
1118         read_unlock(&in_dev->mc_list_lock);
1119 }
1120 #endif
1121
1122 static void igmp_group_dropped(struct ip_mc_list *im)
1123 {
1124         struct in_device *in_dev = im->interface;
1125 #ifdef CONFIG_IP_MULTICAST
1126         int reporter;
1127 #endif
1128
1129         if (im->loaded) {
1130                 im->loaded = 0;
1131                 ip_mc_filter_del(in_dev, im->multiaddr);
1132         }
1133
1134 #ifdef CONFIG_IP_MULTICAST
1135         if (im->multiaddr == IGMP_ALL_HOSTS)
1136                 return;
1137
1138         reporter = im->reporter;
1139         igmp_stop_timer(im);
1140
1141         if (!in_dev->dead) {
1142                 if (IGMP_V1_SEEN(in_dev))
1143                         goto done;
1144                 if (IGMP_V2_SEEN(in_dev)) {
1145                         if (reporter)
1146                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1147                         goto done;
1148                 }
1149                 /* IGMPv3 */
1150                 igmpv3_add_delrec(in_dev, im);
1151
1152                 igmp_ifc_event(in_dev);
1153         }
1154 done:
1155 #endif
1156         ip_mc_clear_src(im);
1157 }
1158
1159 static void igmp_group_added(struct ip_mc_list *im)
1160 {
1161         struct in_device *in_dev = im->interface;
1162
1163         if (im->loaded == 0) {
1164                 im->loaded = 1;
1165                 ip_mc_filter_add(in_dev, im->multiaddr);
1166         }
1167
1168 #ifdef CONFIG_IP_MULTICAST
1169         if (im->multiaddr == IGMP_ALL_HOSTS)
1170                 return;
1171
1172         if (in_dev->dead)
1173                 return;
1174         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1175                 spin_lock_bh(&im->lock);
1176                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1177                 spin_unlock_bh(&im->lock);
1178                 return;
1179         }
1180         /* else, v3 */
1181
1182         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1183                 IGMP_Unsolicited_Report_Count;
1184         igmp_ifc_event(in_dev);
1185 #endif
1186 }
1187
1188
1189 /*
1190  *      Multicast list managers
1191  */
1192
1193
1194 /*
1195  *      A socket has joined a multicast group on device dev.
1196  */
1197
1198 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1199 {
1200         struct ip_mc_list *im;
1201
1202         ASSERT_RTNL();
1203
1204         for (im=in_dev->mc_list; im; im=im->next) {
1205                 if (im->multiaddr == addr) {
1206                         im->users++;
1207                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1208                         goto out;
1209                 }
1210         }
1211
1212         im = kmalloc(sizeof(*im), GFP_KERNEL);
1213         if (!im)
1214                 goto out;
1215
1216         im->users=1;
1217         im->interface=in_dev;
1218         in_dev_hold(in_dev);
1219         im->multiaddr=addr;
1220         /* initial mode is (EX, empty) */
1221         im->sfmode = MCAST_EXCLUDE;
1222         im->sfcount[MCAST_INCLUDE] = 0;
1223         im->sfcount[MCAST_EXCLUDE] = 1;
1224         im->sources = NULL;
1225         im->tomb = NULL;
1226         im->crcount = 0;
1227         atomic_set(&im->refcnt, 1);
1228         spin_lock_init(&im->lock);
1229 #ifdef CONFIG_IP_MULTICAST
1230         im->tm_running=0;
1231         init_timer(&im->timer);
1232         im->timer.data=(unsigned long)im;
1233         im->timer.function=&igmp_timer_expire;
1234         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1235         im->reporter = 0;
1236         im->gsquery = 0;
1237 #endif
1238         im->loaded = 0;
1239         write_lock_bh(&in_dev->mc_list_lock);
1240         im->next=in_dev->mc_list;
1241         in_dev->mc_list=im;
1242         write_unlock_bh(&in_dev->mc_list_lock);
1243 #ifdef CONFIG_IP_MULTICAST
1244         igmpv3_del_delrec(in_dev, im->multiaddr);
1245 #endif
1246         igmp_group_added(im);
1247         if (!in_dev->dead)
1248                 ip_rt_multicast_event(in_dev);
1249 out:
1250         return;
1251 }
1252
1253 /*
1254  *      Resend IGMP JOIN report; used for bonding.
1255  */
1256 void ip_mc_rejoin_group(struct ip_mc_list *im)
1257 {
1258 #ifdef CONFIG_IP_MULTICAST
1259         struct in_device *in_dev = im->interface;
1260
1261         if (im->multiaddr == IGMP_ALL_HOSTS)
1262                 return;
1263
1264         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1265                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1266                 return;
1267         }
1268         /* else, v3 */
1269         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1270                 IGMP_Unsolicited_Report_Count;
1271         igmp_ifc_event(in_dev);
1272 #endif
1273 }
1274
1275 /*
1276  *      A socket has left a multicast group on device dev
1277  */
1278
1279 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1280 {
1281         struct ip_mc_list *i, **ip;
1282
1283         ASSERT_RTNL();
1284
1285         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1286                 if (i->multiaddr==addr) {
1287                         if (--i->users == 0) {
1288                                 write_lock_bh(&in_dev->mc_list_lock);
1289                                 *ip = i->next;
1290                                 write_unlock_bh(&in_dev->mc_list_lock);
1291                                 igmp_group_dropped(i);
1292
1293                                 if (!in_dev->dead)
1294                                         ip_rt_multicast_event(in_dev);
1295
1296                                 ip_ma_put(i);
1297                                 return;
1298                         }
1299                         break;
1300                 }
1301         }
1302 }
1303
1304 /* Device going down */
1305
1306 void ip_mc_down(struct in_device *in_dev)
1307 {
1308         struct ip_mc_list *i;
1309
1310         ASSERT_RTNL();
1311
1312         for (i=in_dev->mc_list; i; i=i->next)
1313                 igmp_group_dropped(i);
1314
1315 #ifdef CONFIG_IP_MULTICAST
1316         in_dev->mr_ifc_count = 0;
1317         if (del_timer(&in_dev->mr_ifc_timer))
1318                 __in_dev_put(in_dev);
1319         in_dev->mr_gq_running = 0;
1320         if (del_timer(&in_dev->mr_gq_timer))
1321                 __in_dev_put(in_dev);
1322         igmpv3_clear_delrec(in_dev);
1323 #endif
1324
1325         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1326 }
1327
1328 void ip_mc_init_dev(struct in_device *in_dev)
1329 {
1330         ASSERT_RTNL();
1331
1332         in_dev->mc_tomb = NULL;
1333 #ifdef CONFIG_IP_MULTICAST
1334         in_dev->mr_gq_running = 0;
1335         init_timer(&in_dev->mr_gq_timer);
1336         in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1337         in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1338         in_dev->mr_ifc_count = 0;
1339         init_timer(&in_dev->mr_ifc_timer);
1340         in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1341         in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1342         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1343 #endif
1344
1345         rwlock_init(&in_dev->mc_list_lock);
1346         spin_lock_init(&in_dev->mc_tomb_lock);
1347 }
1348
1349 /* Device going up */
1350
1351 void ip_mc_up(struct in_device *in_dev)
1352 {
1353         struct ip_mc_list *i;
1354
1355         ASSERT_RTNL();
1356
1357         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1358
1359         for (i=in_dev->mc_list; i; i=i->next)
1360                 igmp_group_added(i);
1361 }
1362
1363 /*
1364  *      Device is about to be destroyed: clean up.
1365  */
1366
1367 void ip_mc_destroy_dev(struct in_device *in_dev)
1368 {
1369         struct ip_mc_list *i;
1370
1371         ASSERT_RTNL();
1372
1373         /* Deactivate timers */
1374         ip_mc_down(in_dev);
1375
1376         write_lock_bh(&in_dev->mc_list_lock);
1377         while ((i = in_dev->mc_list) != NULL) {
1378                 in_dev->mc_list = i->next;
1379                 write_unlock_bh(&in_dev->mc_list_lock);
1380
1381                 igmp_group_dropped(i);
1382                 ip_ma_put(i);
1383
1384                 write_lock_bh(&in_dev->mc_list_lock);
1385         }
1386         write_unlock_bh(&in_dev->mc_list_lock);
1387 }
1388
1389 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1390 {
1391         struct flowi fl = { .nl_u = { .ip4_u =
1392                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1393         struct rtable *rt;
1394         struct net_device *dev = NULL;
1395         struct in_device *idev = NULL;
1396
1397         if (imr->imr_ifindex) {
1398                 idev = inetdev_by_index(imr->imr_ifindex);
1399                 if (idev)
1400                         __in_dev_put(idev);
1401                 return idev;
1402         }
1403         if (imr->imr_address.s_addr) {
1404                 dev = ip_dev_find(imr->imr_address.s_addr);
1405                 if (!dev)
1406                         return NULL;
1407                 dev_put(dev);
1408         }
1409
1410         if (!dev && !ip_route_output_key(&rt, &fl)) {
1411                 dev = rt->u.dst.dev;
1412                 ip_rt_put(rt);
1413         }
1414         if (dev) {
1415                 imr->imr_ifindex = dev->ifindex;
1416                 idev = __in_dev_get_rtnl(dev);
1417         }
1418         return idev;
1419 }
1420
1421 /*
1422  *      Join a socket to a group
1423  */
1424 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1425 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1426
1427
1428 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1429         __be32 *psfsrc)
1430 {
1431         struct ip_sf_list *psf, *psf_prev;
1432         int rv = 0;
1433
1434         psf_prev = NULL;
1435         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1436                 if (psf->sf_inaddr == *psfsrc)
1437                         break;
1438                 psf_prev = psf;
1439         }
1440         if (!psf || psf->sf_count[sfmode] == 0) {
1441                 /* source filter not found, or count wrong =>  bug */
1442                 return -ESRCH;
1443         }
1444         psf->sf_count[sfmode]--;
1445         if (psf->sf_count[sfmode] == 0) {
1446                 ip_rt_multicast_event(pmc->interface);
1447         }
1448         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1449 #ifdef CONFIG_IP_MULTICAST
1450                 struct in_device *in_dev = pmc->interface;
1451 #endif
1452
1453                 /* no more filters for this source */
1454                 if (psf_prev)
1455                         psf_prev->sf_next = psf->sf_next;
1456                 else
1457                         pmc->sources = psf->sf_next;
1458 #ifdef CONFIG_IP_MULTICAST
1459                 if (psf->sf_oldin &&
1460                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1461                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1462                                 IGMP_Unsolicited_Report_Count;
1463                         psf->sf_next = pmc->tomb;
1464                         pmc->tomb = psf;
1465                         rv = 1;
1466                 } else
1467 #endif
1468                         kfree(psf);
1469         }
1470         return rv;
1471 }
1472
1473 #ifndef CONFIG_IP_MULTICAST
1474 #define igmp_ifc_event(x)       do { } while (0)
1475 #endif
1476
1477 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1478                          int sfcount, __be32 *psfsrc, int delta)
1479 {
1480         struct ip_mc_list *pmc;
1481         int     changerec = 0;
1482         int     i, err;
1483
1484         if (!in_dev)
1485                 return -ENODEV;
1486         read_lock(&in_dev->mc_list_lock);
1487         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1488                 if (*pmca == pmc->multiaddr)
1489                         break;
1490         }
1491         if (!pmc) {
1492                 /* MCA not found?? bug */
1493                 read_unlock(&in_dev->mc_list_lock);
1494                 return -ESRCH;
1495         }
1496         spin_lock_bh(&pmc->lock);
1497         read_unlock(&in_dev->mc_list_lock);
1498 #ifdef CONFIG_IP_MULTICAST
1499         sf_markstate(pmc);
1500 #endif
1501         if (!delta) {
1502                 err = -EINVAL;
1503                 if (!pmc->sfcount[sfmode])
1504                         goto out_unlock;
1505                 pmc->sfcount[sfmode]--;
1506         }
1507         err = 0;
1508         for (i=0; i<sfcount; i++) {
1509                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1510
1511                 changerec |= rv > 0;
1512                 if (!err && rv < 0)
1513                         err = rv;
1514         }
1515         if (pmc->sfmode == MCAST_EXCLUDE &&
1516             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1517             pmc->sfcount[MCAST_INCLUDE]) {
1518 #ifdef CONFIG_IP_MULTICAST
1519                 struct ip_sf_list *psf;
1520 #endif
1521
1522                 /* filter mode change */
1523                 pmc->sfmode = MCAST_INCLUDE;
1524 #ifdef CONFIG_IP_MULTICAST
1525                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1526                         IGMP_Unsolicited_Report_Count;
1527                 in_dev->mr_ifc_count = pmc->crcount;
1528                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1529                         psf->sf_crcount = 0;
1530                 igmp_ifc_event(pmc->interface);
1531         } else if (sf_setstate(pmc) || changerec) {
1532                 igmp_ifc_event(pmc->interface);
1533 #endif
1534         }
1535 out_unlock:
1536         spin_unlock_bh(&pmc->lock);
1537         return err;
1538 }
1539
1540 /*
1541  * Add multicast single-source filter to the interface list
1542  */
1543 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1544         __be32 *psfsrc, int delta)
1545 {
1546         struct ip_sf_list *psf, *psf_prev;
1547
1548         psf_prev = NULL;
1549         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1550                 if (psf->sf_inaddr == *psfsrc)
1551                         break;
1552                 psf_prev = psf;
1553         }
1554         if (!psf) {
1555                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1556                 if (!psf)
1557                         return -ENOBUFS;
1558                 psf->sf_inaddr = *psfsrc;
1559                 if (psf_prev) {
1560                         psf_prev->sf_next = psf;
1561                 } else
1562                         pmc->sources = psf;
1563         }
1564         psf->sf_count[sfmode]++;
1565         if (psf->sf_count[sfmode] == 1) {
1566                 ip_rt_multicast_event(pmc->interface);
1567         }
1568         return 0;
1569 }
1570
1571 #ifdef CONFIG_IP_MULTICAST
1572 static void sf_markstate(struct ip_mc_list *pmc)
1573 {
1574         struct ip_sf_list *psf;
1575         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1576
1577         for (psf=pmc->sources; psf; psf=psf->sf_next)
1578                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1579                         psf->sf_oldin = mca_xcount ==
1580                                 psf->sf_count[MCAST_EXCLUDE] &&
1581                                 !psf->sf_count[MCAST_INCLUDE];
1582                 } else
1583                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1584 }
1585
1586 static int sf_setstate(struct ip_mc_list *pmc)
1587 {
1588         struct ip_sf_list *psf, *dpsf;
1589         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1590         int qrv = pmc->interface->mr_qrv;
1591         int new_in, rv;
1592
1593         rv = 0;
1594         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1595                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1596                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1597                                 !psf->sf_count[MCAST_INCLUDE];
1598                 } else
1599                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1600                 if (new_in) {
1601                         if (!psf->sf_oldin) {
1602                                 struct ip_sf_list *prev = NULL;
1603
1604                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1605                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1606                                                 break;
1607                                         prev = dpsf;
1608                                 }
1609                                 if (dpsf) {
1610                                         if (prev)
1611                                                 prev->sf_next = dpsf->sf_next;
1612                                         else
1613                                                 pmc->tomb = dpsf->sf_next;
1614                                         kfree(dpsf);
1615                                 }
1616                                 psf->sf_crcount = qrv;
1617                                 rv++;
1618                         }
1619                 } else if (psf->sf_oldin) {
1620
1621                         psf->sf_crcount = 0;
1622                         /*
1623                          * add or update "delete" records if an active filter
1624                          * is now inactive
1625                          */
1626                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1627                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1628                                         break;
1629                         if (!dpsf) {
1630                                 dpsf = (struct ip_sf_list *)
1631                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1632                                 if (!dpsf)
1633                                         continue;
1634                                 *dpsf = *psf;
1635                                 /* pmc->lock held by callers */
1636                                 dpsf->sf_next = pmc->tomb;
1637                                 pmc->tomb = dpsf;
1638                         }
1639                         dpsf->sf_crcount = qrv;
1640                         rv++;
1641                 }
1642         }
1643         return rv;
1644 }
1645 #endif
1646
1647 /*
1648  * Add multicast source filter list to the interface list
1649  */
1650 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1651                          int sfcount, __be32 *psfsrc, int delta)
1652 {
1653         struct ip_mc_list *pmc;
1654         int     isexclude;
1655         int     i, err;
1656
1657         if (!in_dev)
1658                 return -ENODEV;
1659         read_lock(&in_dev->mc_list_lock);
1660         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1661                 if (*pmca == pmc->multiaddr)
1662                         break;
1663         }
1664         if (!pmc) {
1665                 /* MCA not found?? bug */
1666                 read_unlock(&in_dev->mc_list_lock);
1667                 return -ESRCH;
1668         }
1669         spin_lock_bh(&pmc->lock);
1670         read_unlock(&in_dev->mc_list_lock);
1671
1672 #ifdef CONFIG_IP_MULTICAST
1673         sf_markstate(pmc);
1674 #endif
1675         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1676         if (!delta)
1677                 pmc->sfcount[sfmode]++;
1678         err = 0;
1679         for (i=0; i<sfcount; i++) {
1680                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1681                 if (err)
1682                         break;
1683         }
1684         if (err) {
1685                 int j;
1686
1687                 pmc->sfcount[sfmode]--;
1688                 for (j=0; j<i; j++)
1689                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1690         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1691 #ifdef CONFIG_IP_MULTICAST
1692                 struct in_device *in_dev = pmc->interface;
1693                 struct ip_sf_list *psf;
1694 #endif
1695
1696                 /* filter mode change */
1697                 if (pmc->sfcount[MCAST_EXCLUDE])
1698                         pmc->sfmode = MCAST_EXCLUDE;
1699                 else if (pmc->sfcount[MCAST_INCLUDE])
1700                         pmc->sfmode = MCAST_INCLUDE;
1701 #ifdef CONFIG_IP_MULTICAST
1702                 /* else no filters; keep old mode for reports */
1703
1704                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1705                         IGMP_Unsolicited_Report_Count;
1706                 in_dev->mr_ifc_count = pmc->crcount;
1707                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1708                         psf->sf_crcount = 0;
1709                 igmp_ifc_event(in_dev);
1710         } else if (sf_setstate(pmc)) {
1711                 igmp_ifc_event(in_dev);
1712 #endif
1713         }
1714         spin_unlock_bh(&pmc->lock);
1715         return err;
1716 }
1717
1718 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1719 {
1720         struct ip_sf_list *psf, *nextpsf;
1721
1722         for (psf=pmc->tomb; psf; psf=nextpsf) {
1723                 nextpsf = psf->sf_next;
1724                 kfree(psf);
1725         }
1726         pmc->tomb = NULL;
1727         for (psf=pmc->sources; psf; psf=nextpsf) {
1728                 nextpsf = psf->sf_next;
1729                 kfree(psf);
1730         }
1731         pmc->sources = NULL;
1732         pmc->sfmode = MCAST_EXCLUDE;
1733         pmc->sfcount[MCAST_INCLUDE] = 0;
1734         pmc->sfcount[MCAST_EXCLUDE] = 1;
1735 }
1736
1737
1738 /*
1739  * Join a multicast group
1740  */
1741 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1742 {
1743         int err;
1744         __be32 addr = imr->imr_multiaddr.s_addr;
1745         struct ip_mc_socklist *iml=NULL, *i;
1746         struct in_device *in_dev;
1747         struct inet_sock *inet = inet_sk(sk);
1748         int ifindex;
1749         int count = 0;
1750
1751         if (!MULTICAST(addr))
1752                 return -EINVAL;
1753
1754         rtnl_lock();
1755
1756         in_dev = ip_mc_find_dev(imr);
1757
1758         if (!in_dev) {
1759                 iml = NULL;
1760                 err = -ENODEV;
1761                 goto done;
1762         }
1763
1764         err = -EADDRINUSE;
1765         ifindex = imr->imr_ifindex;
1766         for (i = inet->mc_list; i; i = i->next) {
1767                 if (i->multi.imr_multiaddr.s_addr == addr &&
1768                     i->multi.imr_ifindex == ifindex)
1769                         goto done;
1770                 count++;
1771         }
1772         err = -ENOBUFS;
1773         if (count >= sysctl_igmp_max_memberships)
1774                 goto done;
1775         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1776         if (iml == NULL)
1777                 goto done;
1778
1779         memcpy(&iml->multi, imr, sizeof(*imr));
1780         iml->next = inet->mc_list;
1781         iml->sflist = NULL;
1782         iml->sfmode = MCAST_EXCLUDE;
1783         inet->mc_list = iml;
1784         ip_mc_inc_group(in_dev, addr);
1785         err = 0;
1786 done:
1787         rtnl_unlock();
1788         return err;
1789 }
1790
1791 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1792                            struct in_device *in_dev)
1793 {
1794         int err;
1795
1796         if (iml->sflist == 0) {
1797                 /* any-source empty exclude case */
1798                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1799                         iml->sfmode, 0, NULL, 0);
1800         }
1801         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1802                         iml->sfmode, iml->sflist->sl_count,
1803                         iml->sflist->sl_addr, 0);
1804         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1805         iml->sflist = NULL;
1806         return err;
1807 }
1808
1809 /*
1810  *      Ask a socket to leave a group.
1811  */
1812
1813 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1814 {
1815         struct inet_sock *inet = inet_sk(sk);
1816         struct ip_mc_socklist *iml, **imlp;
1817         struct in_device *in_dev;
1818         __be32 group = imr->imr_multiaddr.s_addr;
1819         u32 ifindex;
1820         int ret = -EADDRNOTAVAIL;
1821
1822         rtnl_lock();
1823         in_dev = ip_mc_find_dev(imr);
1824         ifindex = imr->imr_ifindex;
1825         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1826                 if (iml->multi.imr_multiaddr.s_addr != group)
1827                         continue;
1828                 if (ifindex) {
1829                         if (iml->multi.imr_ifindex != ifindex)
1830                                 continue;
1831                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1832                                 iml->multi.imr_address.s_addr)
1833                         continue;
1834
1835                 (void) ip_mc_leave_src(sk, iml, in_dev);
1836
1837                 *imlp = iml->next;
1838
1839                 if (in_dev)
1840                         ip_mc_dec_group(in_dev, group);
1841                 rtnl_unlock();
1842                 sock_kfree_s(sk, iml, sizeof(*iml));
1843                 return 0;
1844         }
1845         if (!in_dev)
1846                 ret = -ENODEV;
1847         rtnl_unlock();
1848         return ret;
1849 }
1850
1851 int ip_mc_source(int add, int omode, struct sock *sk, struct
1852         ip_mreq_source *mreqs, int ifindex)
1853 {
1854         int err;
1855         struct ip_mreqn imr;
1856         __be32 addr = mreqs->imr_multiaddr;
1857         struct ip_mc_socklist *pmc;
1858         struct in_device *in_dev = NULL;
1859         struct inet_sock *inet = inet_sk(sk);
1860         struct ip_sf_socklist *psl;
1861         int leavegroup = 0;
1862         int i, j, rv;
1863
1864         if (!MULTICAST(addr))
1865                 return -EINVAL;
1866
1867         rtnl_lock();
1868
1869         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1870         imr.imr_address.s_addr = mreqs->imr_interface;
1871         imr.imr_ifindex = ifindex;
1872         in_dev = ip_mc_find_dev(&imr);
1873
1874         if (!in_dev) {
1875                 err = -ENODEV;
1876                 goto done;
1877         }
1878         err = -EADDRNOTAVAIL;
1879
1880         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1881                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1882                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1883                         break;
1884         }
1885         if (!pmc) {             /* must have a prior join */
1886                 err = -EINVAL;
1887                 goto done;
1888         }
1889         /* if a source filter was set, must be the same mode as before */
1890         if (pmc->sflist) {
1891                 if (pmc->sfmode != omode) {
1892                         err = -EINVAL;
1893                         goto done;
1894                 }
1895         } else if (pmc->sfmode != omode) {
1896                 /* allow mode switches for empty-set filters */
1897                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1898                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1899                         NULL, 0);
1900                 pmc->sfmode = omode;
1901         }
1902
1903         psl = pmc->sflist;
1904         if (!add) {
1905                 if (!psl)
1906                         goto done;      /* err = -EADDRNOTAVAIL */
1907                 rv = !0;
1908                 for (i=0; i<psl->sl_count; i++) {
1909                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1910                                 sizeof(__be32));
1911                         if (rv == 0)
1912                                 break;
1913                 }
1914                 if (rv)         /* source not found */
1915                         goto done;      /* err = -EADDRNOTAVAIL */
1916
1917                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1918                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1919                         leavegroup = 1;
1920                         goto done;
1921                 }
1922
1923                 /* update the interface filter */
1924                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1925                         &mreqs->imr_sourceaddr, 1);
1926
1927                 for (j=i+1; j<psl->sl_count; j++)
1928                         psl->sl_addr[j-1] = psl->sl_addr[j];
1929                 psl->sl_count--;
1930                 err = 0;
1931                 goto done;
1932         }
1933         /* else, add a new source to the filter */
1934
1935         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1936                 err = -ENOBUFS;
1937                 goto done;
1938         }
1939         if (!psl || psl->sl_count == psl->sl_max) {
1940                 struct ip_sf_socklist *newpsl;
1941                 int count = IP_SFBLOCK;
1942
1943                 if (psl)
1944                         count += psl->sl_max;
1945                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1946                 if (!newpsl) {
1947                         err = -ENOBUFS;
1948                         goto done;
1949                 }
1950                 newpsl->sl_max = count;
1951                 newpsl->sl_count = count - IP_SFBLOCK;
1952                 if (psl) {
1953                         for (i=0; i<psl->sl_count; i++)
1954                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1955                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1956                 }
1957                 pmc->sflist = psl = newpsl;
1958         }
1959         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1960         for (i=0; i<psl->sl_count; i++) {
1961                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1962                         sizeof(__be32));
1963                 if (rv == 0)
1964                         break;
1965         }
1966         if (rv == 0)            /* address already there is an error */
1967                 goto done;
1968         for (j=psl->sl_count-1; j>=i; j--)
1969                 psl->sl_addr[j+1] = psl->sl_addr[j];
1970         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1971         psl->sl_count++;
1972         err = 0;
1973         /* update the interface list */
1974         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1975                 &mreqs->imr_sourceaddr, 1);
1976 done:
1977         rtnl_unlock();
1978         if (leavegroup)
1979                 return ip_mc_leave_group(sk, &imr);
1980         return err;
1981 }
1982
1983 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1984 {
1985         int err = 0;
1986         struct ip_mreqn imr;
1987         __be32 addr = msf->imsf_multiaddr;
1988         struct ip_mc_socklist *pmc;
1989         struct in_device *in_dev;
1990         struct inet_sock *inet = inet_sk(sk);
1991         struct ip_sf_socklist *newpsl, *psl;
1992         int leavegroup = 0;
1993
1994         if (!MULTICAST(addr))
1995                 return -EINVAL;
1996         if (msf->imsf_fmode != MCAST_INCLUDE &&
1997             msf->imsf_fmode != MCAST_EXCLUDE)
1998                 return -EINVAL;
1999
2000         rtnl_lock();
2001
2002         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2003         imr.imr_address.s_addr = msf->imsf_interface;
2004         imr.imr_ifindex = ifindex;
2005         in_dev = ip_mc_find_dev(&imr);
2006
2007         if (!in_dev) {
2008                 err = -ENODEV;
2009                 goto done;
2010         }
2011
2012         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2013         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2014                 leavegroup = 1;
2015                 goto done;
2016         }
2017
2018         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2019                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2020                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2021                         break;
2022         }
2023         if (!pmc) {             /* must have a prior join */
2024                 err = -EINVAL;
2025                 goto done;
2026         }
2027         if (msf->imsf_numsrc) {
2028                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2029                                                            GFP_KERNEL);
2030                 if (!newpsl) {
2031                         err = -ENOBUFS;
2032                         goto done;
2033                 }
2034                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2035                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2036                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2037                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2038                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2039                 if (err) {
2040                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2041                         goto done;
2042                 }
2043         } else {
2044                 newpsl = NULL;
2045                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2046                                      msf->imsf_fmode, 0, NULL, 0);
2047         }
2048         psl = pmc->sflist;
2049         if (psl) {
2050                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2051                         psl->sl_count, psl->sl_addr, 0);
2052                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2053         } else
2054                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2055                         0, NULL, 0);
2056         pmc->sflist = newpsl;
2057         pmc->sfmode = msf->imsf_fmode;
2058         err = 0;
2059 done:
2060         rtnl_unlock();
2061         if (leavegroup)
2062                 err = ip_mc_leave_group(sk, &imr);
2063         return err;
2064 }
2065
2066 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2067         struct ip_msfilter __user *optval, int __user *optlen)
2068 {
2069         int err, len, count, copycount;
2070         struct ip_mreqn imr;
2071         __be32 addr = msf->imsf_multiaddr;
2072         struct ip_mc_socklist *pmc;
2073         struct in_device *in_dev;
2074         struct inet_sock *inet = inet_sk(sk);
2075         struct ip_sf_socklist *psl;
2076
2077         if (!MULTICAST(addr))
2078                 return -EINVAL;
2079
2080         rtnl_lock();
2081
2082         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2083         imr.imr_address.s_addr = msf->imsf_interface;
2084         imr.imr_ifindex = 0;
2085         in_dev = ip_mc_find_dev(&imr);
2086
2087         if (!in_dev) {
2088                 err = -ENODEV;
2089                 goto done;
2090         }
2091         err = -EADDRNOTAVAIL;
2092
2093         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2094                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2095                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2096                         break;
2097         }
2098         if (!pmc)               /* must have a prior join */
2099                 goto done;
2100         msf->imsf_fmode = pmc->sfmode;
2101         psl = pmc->sflist;
2102         rtnl_unlock();
2103         if (!psl) {
2104                 len = 0;
2105                 count = 0;
2106         } else {
2107                 count = psl->sl_count;
2108         }
2109         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2110         len = copycount * sizeof(psl->sl_addr[0]);
2111         msf->imsf_numsrc = count;
2112         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2113             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2114                 return -EFAULT;
2115         }
2116         if (len &&
2117             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2118                 return -EFAULT;
2119         return 0;
2120 done:
2121         rtnl_unlock();
2122         return err;
2123 }
2124
2125 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2126         struct group_filter __user *optval, int __user *optlen)
2127 {
2128         int err, i, count, copycount;
2129         struct sockaddr_in *psin;
2130         __be32 addr;
2131         struct ip_mc_socklist *pmc;
2132         struct inet_sock *inet = inet_sk(sk);
2133         struct ip_sf_socklist *psl;
2134
2135         psin = (struct sockaddr_in *)&gsf->gf_group;
2136         if (psin->sin_family != AF_INET)
2137                 return -EINVAL;
2138         addr = psin->sin_addr.s_addr;
2139         if (!MULTICAST(addr))
2140                 return -EINVAL;
2141
2142         rtnl_lock();
2143
2144         err = -EADDRNOTAVAIL;
2145
2146         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2147                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2148                     pmc->multi.imr_ifindex == gsf->gf_interface)
2149                         break;
2150         }
2151         if (!pmc)               /* must have a prior join */
2152                 goto done;
2153         gsf->gf_fmode = pmc->sfmode;
2154         psl = pmc->sflist;
2155         rtnl_unlock();
2156         count = psl ? psl->sl_count : 0;
2157         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2158         gsf->gf_numsrc = count;
2159         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2160             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2161                 return -EFAULT;
2162         }
2163         for (i=0; i<copycount; i++) {
2164                 struct sockaddr_in *psin;
2165                 struct sockaddr_storage ss;
2166
2167                 psin = (struct sockaddr_in *)&ss;
2168                 memset(&ss, 0, sizeof(ss));
2169                 psin->sin_family = AF_INET;
2170                 psin->sin_addr.s_addr = psl->sl_addr[i];
2171                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2172                         return -EFAULT;
2173         }
2174         return 0;
2175 done:
2176         rtnl_unlock();
2177         return err;
2178 }
2179
2180 /*
2181  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2182  */
2183 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2184 {
2185         struct inet_sock *inet = inet_sk(sk);
2186         struct ip_mc_socklist *pmc;
2187         struct ip_sf_socklist *psl;
2188         int i;
2189
2190         if (!MULTICAST(loc_addr))
2191                 return 1;
2192
2193         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2194                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2195                     pmc->multi.imr_ifindex == dif)
2196                         break;
2197         }
2198         if (!pmc)
2199                 return 1;
2200         psl = pmc->sflist;
2201         if (!psl)
2202                 return pmc->sfmode == MCAST_EXCLUDE;
2203
2204         for (i=0; i<psl->sl_count; i++) {
2205                 if (psl->sl_addr[i] == rmt_addr)
2206                         break;
2207         }
2208         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2209                 return 0;
2210         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2211                 return 0;
2212         return 1;
2213 }
2214
2215 /*
2216  *      A socket is closing.
2217  */
2218
2219 void ip_mc_drop_socket(struct sock *sk)
2220 {
2221         struct inet_sock *inet = inet_sk(sk);
2222         struct ip_mc_socklist *iml;
2223
2224         if (inet->mc_list == NULL)
2225                 return;
2226
2227         rtnl_lock();
2228         while ((iml = inet->mc_list) != NULL) {
2229                 struct in_device *in_dev;
2230                 inet->mc_list = iml->next;
2231
2232                 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
2233                 (void) ip_mc_leave_src(sk, iml, in_dev);
2234                 if (in_dev != NULL) {
2235                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2236                         in_dev_put(in_dev);
2237                 }
2238                 sock_kfree_s(sk, iml, sizeof(*iml));
2239         }
2240         rtnl_unlock();
2241 }
2242
2243 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2244 {
2245         struct ip_mc_list *im;
2246         struct ip_sf_list *psf;
2247         int rv = 0;
2248
2249         read_lock(&in_dev->mc_list_lock);
2250         for (im=in_dev->mc_list; im; im=im->next) {
2251                 if (im->multiaddr == mc_addr)
2252                         break;
2253         }
2254         if (im && proto == IPPROTO_IGMP) {
2255                 rv = 1;
2256         } else if (im) {
2257                 if (src_addr) {
2258                         for (psf=im->sources; psf; psf=psf->sf_next) {
2259                                 if (psf->sf_inaddr == src_addr)
2260                                         break;
2261                         }
2262                         if (psf)
2263                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2264                                         psf->sf_count[MCAST_EXCLUDE] !=
2265                                         im->sfcount[MCAST_EXCLUDE];
2266                         else
2267                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2268                 } else
2269                         rv = 1; /* unspecified source; tentatively allow */
2270         }
2271         read_unlock(&in_dev->mc_list_lock);
2272         return rv;
2273 }
2274
2275 #if defined(CONFIG_PROC_FS)
2276 struct igmp_mc_iter_state {
2277         struct net_device *dev;
2278         struct in_device *in_dev;
2279 };
2280
2281 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2282
2283 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2284 {
2285         struct ip_mc_list *im = NULL;
2286         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2287
2288         for (state->dev = dev_base, state->in_dev = NULL;
2289              state->dev;
2290              state->dev = state->dev->next) {
2291                 struct in_device *in_dev;
2292                 in_dev = in_dev_get(state->dev);
2293                 if (!in_dev)
2294                         continue;
2295                 read_lock(&in_dev->mc_list_lock);
2296                 im = in_dev->mc_list;
2297                 if (im) {
2298                         state->in_dev = in_dev;
2299                         break;
2300                 }
2301                 read_unlock(&in_dev->mc_list_lock);
2302                 in_dev_put(in_dev);
2303         }
2304         return im;
2305 }
2306
2307 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2308 {
2309         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2310         im = im->next;
2311         while (!im) {
2312                 if (likely(state->in_dev != NULL)) {
2313                         read_unlock(&state->in_dev->mc_list_lock);
2314                         in_dev_put(state->in_dev);
2315                 }
2316                 state->dev = state->dev->next;
2317                 if (!state->dev) {
2318                         state->in_dev = NULL;
2319                         break;
2320                 }
2321                 state->in_dev = in_dev_get(state->dev);
2322                 if (!state->in_dev)
2323                         continue;
2324                 read_lock(&state->in_dev->mc_list_lock);
2325                 im = state->in_dev->mc_list;
2326         }
2327         return im;
2328 }
2329
2330 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2331 {
2332         struct ip_mc_list *im = igmp_mc_get_first(seq);
2333         if (im)
2334                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2335                         --pos;
2336         return pos ? NULL : im;
2337 }
2338
2339 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2340 {
2341         read_lock(&dev_base_lock);
2342         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2343 }
2344
2345 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2346 {
2347         struct ip_mc_list *im;
2348         if (v == SEQ_START_TOKEN)
2349                 im = igmp_mc_get_first(seq);
2350         else
2351                 im = igmp_mc_get_next(seq, v);
2352         ++*pos;
2353         return im;
2354 }
2355
2356 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2357 {
2358         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2359         if (likely(state->in_dev != NULL)) {
2360                 read_unlock(&state->in_dev->mc_list_lock);
2361                 in_dev_put(state->in_dev);
2362                 state->in_dev = NULL;
2363         }
2364         state->dev = NULL;
2365         read_unlock(&dev_base_lock);
2366 }
2367
2368 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2369 {
2370         if (v == SEQ_START_TOKEN)
2371                 seq_puts(seq,
2372                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2373         else {
2374                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2375                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2376                 char   *querier;
2377 #ifdef CONFIG_IP_MULTICAST
2378                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2379                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2380                           "V3";
2381 #else
2382                 querier = "NONE";
2383 #endif
2384
2385                 if (state->in_dev->mc_list == im) {
2386                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2387                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2388                 }
2389
2390                 seq_printf(seq,
2391                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2392                            im->multiaddr, im->users,
2393                            im->tm_running, im->tm_running ?
2394                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2395                            im->reporter);
2396         }
2397         return 0;
2398 }
2399
2400 static struct seq_operations igmp_mc_seq_ops = {
2401         .start  =       igmp_mc_seq_start,
2402         .next   =       igmp_mc_seq_next,
2403         .stop   =       igmp_mc_seq_stop,
2404         .show   =       igmp_mc_seq_show,
2405 };
2406
2407 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2408 {
2409         struct seq_file *seq;
2410         int rc = -ENOMEM;
2411         struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2412
2413         if (!s)
2414                 goto out;
2415         rc = seq_open(file, &igmp_mc_seq_ops);
2416         if (rc)
2417                 goto out_kfree;
2418
2419         seq = file->private_data;
2420         seq->private = s;
2421 out:
2422         return rc;
2423 out_kfree:
2424         kfree(s);
2425         goto out;
2426 }
2427
2428 static const struct file_operations igmp_mc_seq_fops = {
2429         .owner          =       THIS_MODULE,
2430         .open           =       igmp_mc_seq_open,
2431         .read           =       seq_read,
2432         .llseek         =       seq_lseek,
2433         .release        =       seq_release_private,
2434 };
2435
2436 struct igmp_mcf_iter_state {
2437         struct net_device *dev;
2438         struct in_device *idev;
2439         struct ip_mc_list *im;
2440 };
2441
2442 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2443
2444 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2445 {
2446         struct ip_sf_list *psf = NULL;
2447         struct ip_mc_list *im = NULL;
2448         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2449
2450         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2451              state->dev;
2452              state->dev = state->dev->next) {
2453                 struct in_device *idev;
2454                 idev = in_dev_get(state->dev);
2455                 if (unlikely(idev == NULL))
2456                         continue;
2457                 read_lock(&idev->mc_list_lock);
2458                 im = idev->mc_list;
2459                 if (likely(im != NULL)) {
2460                         spin_lock_bh(&im->lock);
2461                         psf = im->sources;
2462                         if (likely(psf != NULL)) {
2463                                 state->im = im;
2464                                 state->idev = idev;
2465                                 break;
2466                         }
2467                         spin_unlock_bh(&im->lock);
2468                 }
2469                 read_unlock(&idev->mc_list_lock);
2470                 in_dev_put(idev);
2471         }
2472         return psf;
2473 }
2474
2475 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2476 {
2477         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2478
2479         psf = psf->sf_next;
2480         while (!psf) {
2481                 spin_unlock_bh(&state->im->lock);
2482                 state->im = state->im->next;
2483                 while (!state->im) {
2484                         if (likely(state->idev != NULL)) {
2485                                 read_unlock(&state->idev->mc_list_lock);
2486                                 in_dev_put(state->idev);
2487                         }
2488                         state->dev = state->dev->next;
2489                         if (!state->dev) {
2490                                 state->idev = NULL;
2491                                 goto out;
2492                         }
2493                         state->idev = in_dev_get(state->dev);
2494                         if (!state->idev)
2495                                 continue;
2496                         read_lock(&state->idev->mc_list_lock);
2497                         state->im = state->idev->mc_list;
2498                 }
2499                 if (!state->im)
2500                         break;
2501                 spin_lock_bh(&state->im->lock);
2502                 psf = state->im->sources;
2503         }
2504 out:
2505         return psf;
2506 }
2507
2508 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2509 {
2510         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2511         if (psf)
2512                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2513                         --pos;
2514         return pos ? NULL : psf;
2515 }
2516
2517 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2518 {
2519         read_lock(&dev_base_lock);
2520         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2521 }
2522
2523 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2524 {
2525         struct ip_sf_list *psf;
2526         if (v == SEQ_START_TOKEN)
2527                 psf = igmp_mcf_get_first(seq);
2528         else
2529                 psf = igmp_mcf_get_next(seq, v);
2530         ++*pos;
2531         return psf;
2532 }
2533
2534 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2535 {
2536         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2537         if (likely(state->im != NULL)) {
2538                 spin_unlock_bh(&state->im->lock);
2539                 state->im = NULL;
2540         }
2541         if (likely(state->idev != NULL)) {
2542                 read_unlock(&state->idev->mc_list_lock);
2543                 in_dev_put(state->idev);
2544                 state->idev = NULL;
2545         }
2546         state->dev = NULL;
2547         read_unlock(&dev_base_lock);
2548 }
2549
2550 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2551 {
2552         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2553         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2554
2555         if (v == SEQ_START_TOKEN) {
2556                 seq_printf(seq,
2557                            "%3s %6s "
2558                            "%10s %10s %6s %6s\n", "Idx",
2559                            "Device", "MCA",
2560                            "SRC", "INC", "EXC");
2561         } else {
2562                 seq_printf(seq,
2563                            "%3d %6.6s 0x%08x "
2564                            "0x%08x %6lu %6lu\n",
2565                            state->dev->ifindex, state->dev->name,
2566                            ntohl(state->im->multiaddr),
2567                            ntohl(psf->sf_inaddr),
2568                            psf->sf_count[MCAST_INCLUDE],
2569                            psf->sf_count[MCAST_EXCLUDE]);
2570         }
2571         return 0;
2572 }
2573
2574 static struct seq_operations igmp_mcf_seq_ops = {
2575         .start  =       igmp_mcf_seq_start,
2576         .next   =       igmp_mcf_seq_next,
2577         .stop   =       igmp_mcf_seq_stop,
2578         .show   =       igmp_mcf_seq_show,
2579 };
2580
2581 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2582 {
2583         struct seq_file *seq;
2584         int rc = -ENOMEM;
2585         struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2586
2587         if (!s)
2588                 goto out;
2589         rc = seq_open(file, &igmp_mcf_seq_ops);
2590         if (rc)
2591                 goto out_kfree;
2592
2593         seq = file->private_data;
2594         seq->private = s;
2595 out:
2596         return rc;
2597 out_kfree:
2598         kfree(s);
2599         goto out;
2600 }
2601
2602 static const struct file_operations igmp_mcf_seq_fops = {
2603         .owner          =       THIS_MODULE,
2604         .open           =       igmp_mcf_seq_open,
2605         .read           =       seq_read,
2606         .llseek         =       seq_lseek,
2607         .release        =       seq_release_private,
2608 };
2609
2610 int __init igmp_mc_proc_init(void)
2611 {
2612         proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2613         proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2614         return 0;
2615 }
2616 #endif
2617
2618 EXPORT_SYMBOL(ip_mc_dec_group);
2619 EXPORT_SYMBOL(ip_mc_inc_group);
2620 EXPORT_SYMBOL(ip_mc_join_group);
2621 EXPORT_SYMBOL(ip_mc_rejoin_group);