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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/net_namespace.h>
  95 #include <net/arp.h>
  96 #include <net/ip.h>
  97 #include <net/protocol.h>
  98 #include <net/route.h>
  99 #include <net/sock.h>
 100 #include <net/checksum.h>
 101 #include <linux/netfilter_ipv4.h>
 102 #ifdef CONFIG_IP_MROUTE
 103 #include <linux/mroute.h>
 104 #endif
 105 #ifdef CONFIG_PROC_FS
 106 #include <linux/proc_fs.h>
 107 #include <linux/seq_file.h>
 108 #endif
 109
 110 #define IP_MAX_MEMBERSHIPS      20
 111 #define IP_MAX_MSF              10
 112
 113 #ifdef CONFIG_IP_MULTICAST
 114 /* Parameter names and values are taken from igmp-v2-06 draft */
 115
 116 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 117 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 118 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 119 #define IGMP_Query_Response_Interval            (10*HZ)
 120 #define IGMP_Unsolicited_Report_Count           2
 121
 122
 123 #define IGMP_Initial_Report_Delay               (1)
 124
 125 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 126  * IGMP specs require to report membership immediately after
 127  * joining a group, but we delay the first report by a
 128  * small interval. It seems more natural and still does not
 129  * contradict to specs provided this delay is small enough.
 130  */
 131
 132 #define IGMP_V1_SEEN(in_dev) \
 133         (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, FORCE_IGMP_VERSION) == 1 || \
 134          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 135          ((in_dev)->mr_v1_seen && \
 136           time_before(jiffies, (in_dev)->mr_v1_seen)))
 137 #define IGMP_V2_SEEN(in_dev) \
 138         (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, FORCE_IGMP_VERSION) == 2 || \
 139          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 140          ((in_dev)->mr_v2_seen && \
 141           time_before(jiffies, (in_dev)->mr_v2_seen)))
 142
 143 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 144 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 145 static void igmpv3_clear_delrec(struct in_device *in_dev);
 146 static int sf_setstate(struct ip_mc_list *pmc);
 147 static void sf_markstate(struct ip_mc_list *pmc);
 148 #endif
 149 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 150 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 151                          int sfcount, __be32 *psfsrc, int delta);
 152
 153 static void ip_ma_put(struct ip_mc_list *im)
 154 {
 155         if (atomic_dec_and_test(&im->refcnt)) {
 156                 in_dev_put(im->interface);
 157                 kfree(im);
 158         }
 159 }
 160
 161 #ifdef CONFIG_IP_MULTICAST
 162
 163 /*
 164  *      Timer management
 165  */
 166
 167 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 168 {
 169         spin_lock_bh(&im->lock);
 170         if (del_timer(&im->timer))
 171                 atomic_dec(&im->refcnt);
 172         im->tm_running=0;
 173         im->reporter = 0;
 174         im->unsolicit_count = 0;
 175         spin_unlock_bh(&im->lock);
 176 }
 177
 178 /* It must be called with locked im->lock */
 179 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 180 {
 181         int tv=net_random() % max_delay;
 182
 183         im->tm_running=1;
 184         if (!mod_timer(&im->timer, jiffies+tv+2))
 185                 atomic_inc(&im->refcnt);
 186 }
 187
 188 static void igmp_gq_start_timer(struct in_device *in_dev)
 189 {
 190         int tv = net_random() % in_dev->mr_maxdelay;
 191
 192         in_dev->mr_gq_running = 1;
 193         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 194                 in_dev_hold(in_dev);
 195 }
 196
 197 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 198 {
 199         int tv = net_random() % delay;
 200
 201         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 202                 in_dev_hold(in_dev);
 203 }
 204
 205 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 206 {
 207         spin_lock_bh(&im->lock);
 208         im->unsolicit_count = 0;
 209         if (del_timer(&im->timer)) {
 210                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 211                         add_timer(&im->timer);
 212                         im->tm_running=1;
 213                         spin_unlock_bh(&im->lock);
 214                         return;
 215                 }
 216                 atomic_dec(&im->refcnt);
 217         }
 218         igmp_start_timer(im, max_delay);
 219         spin_unlock_bh(&im->lock);
 220 }
 221
 222
 223 /*
 224  *      Send an IGMP report.
 225  */
 226
 227 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 228
 229
 230 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 231         int gdeleted, int sdeleted)
 232 {
 233         switch (type) {
 234         case IGMPV3_MODE_IS_INCLUDE:
 235         case IGMPV3_MODE_IS_EXCLUDE:
 236                 if (gdeleted || sdeleted)
 237                         return 0;
 238                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 239                         if (pmc->sfmode == MCAST_INCLUDE)
 240                                 return 1;
 241                         /* don't include if this source is excluded
 242                          * in all filters
 243                          */
 244                         if (psf->sf_count[MCAST_INCLUDE])
 245                                 return type == IGMPV3_MODE_IS_INCLUDE;
 246                         return pmc->sfcount[MCAST_EXCLUDE] ==
 247                                 psf->sf_count[MCAST_EXCLUDE];
 248                 }
 249                 return 0;
 250         case IGMPV3_CHANGE_TO_INCLUDE:
 251                 if (gdeleted || sdeleted)
 252                         return 0;
 253                 return psf->sf_count[MCAST_INCLUDE] != 0;
 254         case IGMPV3_CHANGE_TO_EXCLUDE:
 255                 if (gdeleted || sdeleted)
 256                         return 0;
 257                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 258                     psf->sf_count[MCAST_INCLUDE])
 259                         return 0;
 260                 return pmc->sfcount[MCAST_EXCLUDE] ==
 261                         psf->sf_count[MCAST_EXCLUDE];
 262         case IGMPV3_ALLOW_NEW_SOURCES:
 263                 if (gdeleted || !psf->sf_crcount)
 264                         return 0;
 265                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 266         case IGMPV3_BLOCK_OLD_SOURCES:
 267                 if (pmc->sfmode == MCAST_INCLUDE)
 268                         return gdeleted || (psf->sf_crcount && sdeleted);
 269                 return psf->sf_crcount && !gdeleted && !sdeleted;
 270         }
 271         return 0;
 272 }
 273
 274 static int
 275 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 276 {
 277         struct ip_sf_list *psf;
 278         int scount = 0;
 279
 280         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 281                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 282                         continue;
 283                 scount++;
 284         }
 285         return scount;
 286 }
 287
 288 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 289 {
 290         struct sk_buff *skb;
 291         struct rtable *rt;
 292         struct iphdr *pip;
 293         struct igmpv3_report *pig;
 294
 295         skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 296         if (skb == NULL)
 297                 return NULL;
 298
 299         {
 300                 struct flowi fl = { .oif = dev->ifindex,
 301                                     .nl_u = { .ip4_u = {
 302                                     .daddr = IGMPV3_ALL_MCR } },
 303                                     .proto = IPPROTO_IGMP };
 304                 if (ip_route_output_key(&init_net, &rt, &fl)) {
 305                         kfree_skb(skb);
 306                         return NULL;
 307                 }
 308         }
 309         if (rt->rt_src == 0) {
 310                 kfree_skb(skb);
 311                 ip_rt_put(rt);
 312                 return NULL;
 313         }
 314
 315         skb->dst = &rt->u.dst;
 316         skb->dev = dev;
 317
 318         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 319
 320         skb_reset_network_header(skb);
 321         pip = ip_hdr(skb);
 322         skb_put(skb, sizeof(struct iphdr) + 4);
 323
 324         pip->version  = 4;
 325         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 326         pip->tos      = 0xc0;
 327         pip->frag_off = htons(IP_DF);
 328         pip->ttl      = 1;
 329         pip->daddr    = rt->rt_dst;
 330         pip->saddr    = rt->rt_src;
 331         pip->protocol = IPPROTO_IGMP;
 332         pip->tot_len  = 0;      /* filled in later */
 333         ip_select_ident(pip, &rt->u.dst, NULL);
 334         ((u8*)&pip[1])[0] = IPOPT_RA;
 335         ((u8*)&pip[1])[1] = 4;
 336         ((u8*)&pip[1])[2] = 0;
 337         ((u8*)&pip[1])[3] = 0;
 338
 339         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 340         skb_put(skb, sizeof(*pig));
 341         pig = igmpv3_report_hdr(skb);
 342         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 343         pig->resv1 = 0;
 344         pig->csum = 0;
 345         pig->resv2 = 0;
 346         pig->ngrec = 0;
 347         return skb;
 348 }
 349
 350 static int igmpv3_sendpack(struct sk_buff *skb)
 351 {
 352         struct igmphdr *pig = igmp_hdr(skb);
 353         const int igmplen = skb->tail - skb->transport_header;
 354
 355         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 356
 357         return ip_local_out(skb);
 358 }
 359
 360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 361 {
 362         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
 363 }
 364
 365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 366         int type, struct igmpv3_grec **ppgr)
 367 {
 368         struct net_device *dev = pmc->interface->dev;
 369         struct igmpv3_report *pih;
 370         struct igmpv3_grec *pgr;
 371
 372         if (!skb)
 373                 skb = igmpv3_newpack(dev, dev->mtu);
 374         if (!skb)
 375                 return NULL;
 376         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 377         pgr->grec_type = type;
 378         pgr->grec_auxwords = 0;
 379         pgr->grec_nsrcs = 0;
 380         pgr->grec_mca = pmc->multiaddr;
 381         pih = igmpv3_report_hdr(skb);
 382         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 383         *ppgr = pgr;
 384         return skb;
 385 }
 386
 387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 388         skb_tailroom(skb)) : 0)
 389
 390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 391         int type, int gdeleted, int sdeleted)
 392 {
 393         struct net_device *dev = pmc->interface->dev;
 394         struct igmpv3_report *pih;
 395         struct igmpv3_grec *pgr = NULL;
 396         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 397         int scount, stotal, first, isquery, truncate;
 398
 399         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 400                 return skb;
 401
 402         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 403                   type == IGMPV3_MODE_IS_EXCLUDE;
 404         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 405                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 406
 407         stotal = scount = 0;
 408
 409         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 410
 411         if (!*psf_list)
 412                 goto empty_source;
 413
 414         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 415
 416         /* EX and TO_EX get a fresh packet, if needed */
 417         if (truncate) {
 418                 if (pih && pih->ngrec &&
 419                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 420                         if (skb)
 421                                 igmpv3_sendpack(skb);
 422                         skb = igmpv3_newpack(dev, dev->mtu);
 423                 }
 424         }
 425         first = 1;
 426         psf_prev = NULL;
 427         for (psf=*psf_list; psf; psf=psf_next) {
 428                 __be32 *psrc;
 429
 430                 psf_next = psf->sf_next;
 431
 432                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 433                         psf_prev = psf;
 434                         continue;
 435                 }
 436
 437                 /* clear marks on query responses */
 438                 if (isquery)
 439                         psf->sf_gsresp = 0;
 440
 441                 if (AVAILABLE(skb) < sizeof(__be32) +
 442                     first*sizeof(struct igmpv3_grec)) {
 443                         if (truncate && !first)
 444                                 break;   /* truncate these */
 445                         if (pgr)
 446                                 pgr->grec_nsrcs = htons(scount);
 447                         if (skb)
 448                                 igmpv3_sendpack(skb);
 449                         skb = igmpv3_newpack(dev, dev->mtu);
 450                         first = 1;
 451                         scount = 0;
 452                 }
 453                 if (first) {
 454                         skb = add_grhead(skb, pmc, type, &pgr);
 455                         first = 0;
 456                 }
 457                 if (!skb)
 458                         return NULL;
 459                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 460                 *psrc = psf->sf_inaddr;
 461                 scount++; stotal++;
 462                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 463                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 464                         psf->sf_crcount--;
 465                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 466                                 if (psf_prev)
 467                                         psf_prev->sf_next = psf->sf_next;
 468                                 else
 469                                         *psf_list = psf->sf_next;
 470                                 kfree(psf);
 471                                 continue;
 472                         }
 473                 }
 474                 psf_prev = psf;
 475         }
 476
 477 empty_source:
 478         if (!stotal) {
 479                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 480                     type == IGMPV3_BLOCK_OLD_SOURCES)
 481                         return skb;
 482                 if (pmc->crcount || isquery) {
 483                         /* make sure we have room for group header */
 484                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 485                                 igmpv3_sendpack(skb);
 486                                 skb = NULL; /* add_grhead will get a new one */
 487                         }
 488                         skb = add_grhead(skb, pmc, type, &pgr);
 489                 }
 490         }
 491         if (pgr)
 492                 pgr->grec_nsrcs = htons(scount);
 493
 494         if (isquery)
 495                 pmc->gsquery = 0;       /* clear query state on report */
 496         return skb;
 497 }
 498
 499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 500 {
 501         struct sk_buff *skb = NULL;
 502         int type;
 503
 504         if (!pmc) {
 505                 read_lock(&in_dev->mc_list_lock);
 506                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 507                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 508                                 continue;
 509                         spin_lock_bh(&pmc->lock);
 510                         if (pmc->sfcount[MCAST_EXCLUDE])
 511                                 type = IGMPV3_MODE_IS_EXCLUDE;
 512                         else
 513                                 type = IGMPV3_MODE_IS_INCLUDE;
 514                         skb = add_grec(skb, pmc, type, 0, 0);
 515                         spin_unlock_bh(&pmc->lock);
 516                 }
 517                 read_unlock(&in_dev->mc_list_lock);
 518         } else {
 519                 spin_lock_bh(&pmc->lock);
 520                 if (pmc->sfcount[MCAST_EXCLUDE])
 521                         type = IGMPV3_MODE_IS_EXCLUDE;
 522                 else
 523                         type = IGMPV3_MODE_IS_INCLUDE;
 524                 skb = add_grec(skb, pmc, type, 0, 0);
 525                 spin_unlock_bh(&pmc->lock);
 526         }
 527         if (!skb)
 528                 return 0;
 529         return igmpv3_sendpack(skb);
 530 }
 531
 532 /*
 533  * remove zero-count source records from a source filter list
 534  */
 535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 536 {
 537         struct ip_sf_list *psf_prev, *psf_next, *psf;
 538
 539         psf_prev = NULL;
 540         for (psf=*ppsf; psf; psf = psf_next) {
 541                 psf_next = psf->sf_next;
 542                 if (psf->sf_crcount == 0) {
 543                         if (psf_prev)
 544                                 psf_prev->sf_next = psf->sf_next;
 545                         else
 546                                 *ppsf = psf->sf_next;
 547                         kfree(psf);
 548                 } else
 549                         psf_prev = psf;
 550         }
 551 }
 552
 553 static void igmpv3_send_cr(struct in_device *in_dev)
 554 {
 555         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 556         struct sk_buff *skb = NULL;
 557         int type, dtype;
 558
 559         read_lock(&in_dev->mc_list_lock);
 560         spin_lock_bh(&in_dev->mc_tomb_lock);
 561
 562         /* deleted MCA's */
 563         pmc_prev = NULL;
 564         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 565                 pmc_next = pmc->next;
 566                 if (pmc->sfmode == MCAST_INCLUDE) {
 567                         type = IGMPV3_BLOCK_OLD_SOURCES;
 568                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 569                         skb = add_grec(skb, pmc, type, 1, 0);
 570                         skb = add_grec(skb, pmc, dtype, 1, 1);
 571                 }
 572                 if (pmc->crcount) {
 573                         if (pmc->sfmode == MCAST_EXCLUDE) {
 574                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 575                                 skb = add_grec(skb, pmc, type, 1, 0);
 576                         }
 577                         pmc->crcount--;
 578                         if (pmc->crcount == 0) {
 579                                 igmpv3_clear_zeros(&pmc->tomb);
 580                                 igmpv3_clear_zeros(&pmc->sources);
 581                         }
 582                 }
 583                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 584                         if (pmc_prev)
 585                                 pmc_prev->next = pmc_next;
 586                         else
 587                                 in_dev->mc_tomb = pmc_next;
 588                         in_dev_put(pmc->interface);
 589                         kfree(pmc);
 590                 } else
 591                         pmc_prev = pmc;
 592         }
 593         spin_unlock_bh(&in_dev->mc_tomb_lock);
 594
 595         /* change recs */
 596         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 597                 spin_lock_bh(&pmc->lock);
 598                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 599                         type = IGMPV3_BLOCK_OLD_SOURCES;
 600                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 601                 } else {
 602                         type = IGMPV3_ALLOW_NEW_SOURCES;
 603                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 604                 }
 605                 skb = add_grec(skb, pmc, type, 0, 0);
 606                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 607
 608                 /* filter mode changes */
 609                 if (pmc->crcount) {
 610                         if (pmc->sfmode == MCAST_EXCLUDE)
 611                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 612                         else
 613                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 614                         skb = add_grec(skb, pmc, type, 0, 0);
 615                         pmc->crcount--;
 616                 }
 617                 spin_unlock_bh(&pmc->lock);
 618         }
 619         read_unlock(&in_dev->mc_list_lock);
 620
 621         if (!skb)
 622                 return;
 623         (void) igmpv3_sendpack(skb);
 624 }
 625
 626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 627         int type)
 628 {
 629         struct sk_buff *skb;
 630         struct iphdr *iph;
 631         struct igmphdr *ih;
 632         struct rtable *rt;
 633         struct net_device *dev = in_dev->dev;
 634         __be32  group = pmc ? pmc->multiaddr : 0;
 635         __be32  dst;
 636
 637         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 638                 return igmpv3_send_report(in_dev, pmc);
 639         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 640                 dst = IGMP_ALL_ROUTER;
 641         else
 642                 dst = group;
 643
 644         {
 645                 struct flowi fl = { .oif = dev->ifindex,
 646                                     .nl_u = { .ip4_u = { .daddr = dst } },
 647                                     .proto = IPPROTO_IGMP };
 648                 if (ip_route_output_key(&init_net, &rt, &fl))
 649                         return -1;
 650         }
 651         if (rt->rt_src == 0) {
 652                 ip_rt_put(rt);
 653                 return -1;
 654         }
 655
 656         skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
 657         if (skb == NULL) {
 658                 ip_rt_put(rt);
 659                 return -1;
 660         }
 661
 662         skb->dst = &rt->u.dst;
 663
 664         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 665
 666         skb_reset_network_header(skb);
 667         iph = ip_hdr(skb);
 668         skb_put(skb, sizeof(struct iphdr) + 4);
 669
 670         iph->version  = 4;
 671         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 672         iph->tos      = 0xc0;
 673         iph->frag_off = htons(IP_DF);
 674         iph->ttl      = 1;
 675         iph->daddr    = dst;
 676         iph->saddr    = rt->rt_src;
 677         iph->protocol = IPPROTO_IGMP;
 678         ip_select_ident(iph, &rt->u.dst, NULL);
 679         ((u8*)&iph[1])[0] = IPOPT_RA;
 680         ((u8*)&iph[1])[1] = 4;
 681         ((u8*)&iph[1])[2] = 0;
 682         ((u8*)&iph[1])[3] = 0;
 683
 684         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 685         ih->type=type;
 686         ih->code=0;
 687         ih->csum=0;
 688         ih->group=group;
 689         ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 690
 691         return ip_local_out(skb);
 692 }
 693
 694 static void igmp_gq_timer_expire(unsigned long data)
 695 {
 696         struct in_device *in_dev = (struct in_device *)data;
 697
 698         in_dev->mr_gq_running = 0;
 699         igmpv3_send_report(in_dev, NULL);
 700         __in_dev_put(in_dev);
 701 }
 702
 703 static void igmp_ifc_timer_expire(unsigned long data)
 704 {
 705         struct in_device *in_dev = (struct in_device *)data;
 706
 707         igmpv3_send_cr(in_dev);
 708         if (in_dev->mr_ifc_count) {
 709                 in_dev->mr_ifc_count--;
 710                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 711         }
 712         __in_dev_put(in_dev);
 713 }
 714
 715 static void igmp_ifc_event(struct in_device *in_dev)
 716 {
 717         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 718                 return;
 719         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 720                 IGMP_Unsolicited_Report_Count;
 721         igmp_ifc_start_timer(in_dev, 1);
 722 }
 723
 724
 725 static void igmp_timer_expire(unsigned long data)
 726 {
 727         struct ip_mc_list *im=(struct ip_mc_list *)data;
 728         struct in_device *in_dev = im->interface;
 729
 730         spin_lock(&im->lock);
 731         im->tm_running=0;
 732
 733         if (im->unsolicit_count) {
 734                 im->unsolicit_count--;
 735                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 736         }
 737         im->reporter = 1;
 738         spin_unlock(&im->lock);
 739
 740         if (IGMP_V1_SEEN(in_dev))
 741                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 742         else if (IGMP_V2_SEEN(in_dev))
 743                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 744         else
 745                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 746
 747         ip_ma_put(im);
 748 }
 749
 750 /* mark EXCLUDE-mode sources */
 751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 752 {
 753         struct ip_sf_list *psf;
 754         int i, scount;
 755
 756         scount = 0;
 757         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 758                 if (scount == nsrcs)
 759                         break;
 760                 for (i=0; i<nsrcs; i++) {
 761                         /* skip inactive filters */
 762                         if (pmc->sfcount[MCAST_INCLUDE] ||
 763                             pmc->sfcount[MCAST_EXCLUDE] !=
 764                             psf->sf_count[MCAST_EXCLUDE])
 765                                 continue;
 766                         if (srcs[i] == psf->sf_inaddr) {
 767                                 scount++;
 768                                 break;
 769                         }
 770                 }
 771         }
 772         pmc->gsquery = 0;
 773         if (scount == nsrcs)    /* all sources excluded */
 774                 return 0;
 775         return 1;
 776 }
 777
 778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 779 {
 780         struct ip_sf_list *psf;
 781         int i, scount;
 782
 783         if (pmc->sfmode == MCAST_EXCLUDE)
 784                 return igmp_xmarksources(pmc, nsrcs, srcs);
 785
 786         /* mark INCLUDE-mode sources */
 787         scount = 0;
 788         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 789                 if (scount == nsrcs)
 790                         break;
 791                 for (i=0; i<nsrcs; i++)
 792                         if (srcs[i] == psf->sf_inaddr) {
 793                                 psf->sf_gsresp = 1;
 794                                 scount++;
 795                                 break;
 796                         }
 797         }
 798         if (!scount) {
 799                 pmc->gsquery = 0;
 800                 return 0;
 801         }
 802         pmc->gsquery = 1;
 803         return 1;
 804 }
 805
 806 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 807 {
 808         struct ip_mc_list *im;
 809
 810         /* Timers are only set for non-local groups */
 811
 812         if (group == IGMP_ALL_HOSTS)
 813                 return;
 814
 815         read_lock(&in_dev->mc_list_lock);
 816         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 817                 if (im->multiaddr == group) {
 818                         igmp_stop_timer(im);
 819                         break;
 820                 }
 821         }
 822         read_unlock(&in_dev->mc_list_lock);
 823 }
 824
 825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 826         int len)
 827 {
 828         struct igmphdr          *ih = igmp_hdr(skb);
 829         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 830         struct ip_mc_list       *im;
 831         __be32                  group = ih->group;
 832         int                     max_delay;
 833         int                     mark = 0;
 834
 835
 836         if (len == 8) {
 837                 if (ih->code == 0) {
 838                         /* Alas, old v1 router presents here. */
 839
 840                         max_delay = IGMP_Query_Response_Interval;
 841                         in_dev->mr_v1_seen = jiffies +
 842                                 IGMP_V1_Router_Present_Timeout;
 843                         group = 0;
 844                 } else {
 845                         /* v2 router present */
 846                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 847                         in_dev->mr_v2_seen = jiffies +
 848                                 IGMP_V2_Router_Present_Timeout;
 849                 }
 850                 /* cancel the interface change timer */
 851                 in_dev->mr_ifc_count = 0;
 852                 if (del_timer(&in_dev->mr_ifc_timer))
 853                         __in_dev_put(in_dev);
 854                 /* clear deleted report items */
 855                 igmpv3_clear_delrec(in_dev);
 856         } else if (len < 12) {
 857                 return; /* ignore bogus packet; freed by caller */
 858         } else { /* v3 */
 859                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 860                         return;
 861
 862                 ih3 = igmpv3_query_hdr(skb);
 863                 if (ih3->nsrcs) {
 864                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 865                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 866                                 return;
 867                         ih3 = igmpv3_query_hdr(skb);
 868                 }
 869
 870                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 871                 if (!max_delay)
 872                         max_delay = 1;  /* can't mod w/ 0 */
 873                 in_dev->mr_maxdelay = max_delay;
 874                 if (ih3->qrv)
 875                         in_dev->mr_qrv = ih3->qrv;
 876                 if (!group) { /* general query */
 877                         if (ih3->nsrcs)
 878                                 return; /* no sources allowed */
 879                         igmp_gq_start_timer(in_dev);
 880                         return;
 881                 }
 882                 /* mark sources to include, if group & source-specific */
 883                 mark = ih3->nsrcs != 0;
 884         }
 885
 886         /*
 887          * - Start the timers in all of our membership records
 888          *   that the query applies to for the interface on
 889          *   which the query arrived excl. those that belong
 890          *   to a "local" group (224.0.0.X)
 891          * - For timers already running check if they need to
 892          *   be reset.
 893          * - Use the igmp->igmp_code field as the maximum
 894          *   delay possible
 895          */
 896         read_lock(&in_dev->mc_list_lock);
 897         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 898                 int changed;
 899
 900                 if (group && group != im->multiaddr)
 901                         continue;
 902                 if (im->multiaddr == IGMP_ALL_HOSTS)
 903                         continue;
 904                 spin_lock_bh(&im->lock);
 905                 if (im->tm_running)
 906                         im->gsquery = im->gsquery && mark;
 907                 else
 908                         im->gsquery = mark;
 909                 changed = !im->gsquery ||
 910                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 911                 spin_unlock_bh(&im->lock);
 912                 if (changed)
 913                         igmp_mod_timer(im, max_delay);
 914         }
 915         read_unlock(&in_dev->mc_list_lock);
 916 }
 917
 918 int igmp_rcv(struct sk_buff *skb)
 919 {
 920         /* This basically follows the spec line by line -- see RFC1112 */
 921         struct igmphdr *ih;
 922         struct in_device *in_dev = in_dev_get(skb->dev);
 923         int len = skb->len;
 924
 925         if (in_dev == NULL)
 926                 goto drop;
 927
 928         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 929                 goto drop_ref;
 930
 931         switch (skb->ip_summed) {
 932         case CHECKSUM_COMPLETE:
 933                 if (!csum_fold(skb->csum))
 934                         break;
 935                 /* fall through */
 936         case CHECKSUM_NONE:
 937                 skb->csum = 0;
 938                 if (__skb_checksum_complete(skb))
 939                         goto drop_ref;
 940         }
 941
 942         ih = igmp_hdr(skb);
 943         switch (ih->type) {
 944         case IGMP_HOST_MEMBERSHIP_QUERY:
 945                 igmp_heard_query(in_dev, skb, len);
 946                 break;
 947         case IGMP_HOST_MEMBERSHIP_REPORT:
 948         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 949         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 950                 /* Is it our report looped back? */
 951                 if (((struct rtable*)skb->dst)->fl.iif == 0)
 952                         break;
 953                 /* don't rely on MC router hearing unicast reports */
 954                 if (skb->pkt_type == PACKET_MULTICAST ||
 955                     skb->pkt_type == PACKET_BROADCAST)
 956                         igmp_heard_report(in_dev, ih->group);
 957                 break;
 958         case IGMP_PIM:
 959 #ifdef CONFIG_IP_PIMSM_V1
 960                 in_dev_put(in_dev);
 961                 return pim_rcv_v1(skb);
 962 #endif
 963         case IGMP_DVMRP:
 964         case IGMP_TRACE:
 965         case IGMP_HOST_LEAVE_MESSAGE:
 966         case IGMP_MTRACE:
 967         case IGMP_MTRACE_RESP:
 968                 break;
 969         default:
 970                 break;
 971         }
 972
 973 drop_ref:
 974         in_dev_put(in_dev);
 975 drop:
 976         kfree_skb(skb);
 977         return 0;
 978 }
 979
 980 #endif
 981
 982
 983 /*
 984  *      Add a filter to a device
 985  */
 986
 987 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 988 {
 989         char buf[MAX_ADDR_LEN];
 990         struct net_device *dev = in_dev->dev;
 991
 992         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 993            We will get multicast token leakage, when IFF_MULTICAST
 994            is changed. This check should be done in dev->set_multicast_list
 995            routine. Something sort of:
 996            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 997            --ANK
 998            */
 999         if (arp_mc_map(addr, buf, dev, 0) == 0)
1000                 dev_mc_add(dev,buf,dev->addr_len,0);
1001 }
1002
1003 /*
1004  *      Remove a filter from a device
1005  */
1006
1007 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1008 {
1009         char buf[MAX_ADDR_LEN];
1010         struct net_device *dev = in_dev->dev;
1011
1012         if (arp_mc_map(addr, buf, dev, 0) == 0)
1013                 dev_mc_delete(dev,buf,dev->addr_len,0);
1014 }
1015
1016 #ifdef CONFIG_IP_MULTICAST
1017 /*
1018  * deleted ip_mc_list manipulation
1019  */
1020 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1021 {
1022         struct ip_mc_list *pmc;
1023
1024         /* this is an "ip_mc_list" for convenience; only the fields below
1025          * are actually used. In particular, the refcnt and users are not
1026          * used for management of the delete list. Using the same structure
1027          * for deleted items allows change reports to use common code with
1028          * non-deleted or query-response MCA's.
1029          */
1030         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1031         if (!pmc)
1032                 return;
1033         spin_lock_bh(&im->lock);
1034         pmc->interface = im->interface;
1035         in_dev_hold(in_dev);
1036         pmc->multiaddr = im->multiaddr;
1037         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1038                 IGMP_Unsolicited_Report_Count;
1039         pmc->sfmode = im->sfmode;
1040         if (pmc->sfmode == MCAST_INCLUDE) {
1041                 struct ip_sf_list *psf;
1042
1043                 pmc->tomb = im->tomb;
1044                 pmc->sources = im->sources;
1045                 im->tomb = im->sources = NULL;
1046                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1047                         psf->sf_crcount = pmc->crcount;
1048         }
1049         spin_unlock_bh(&im->lock);
1050
1051         spin_lock_bh(&in_dev->mc_tomb_lock);
1052         pmc->next = in_dev->mc_tomb;
1053         in_dev->mc_tomb = pmc;
1054         spin_unlock_bh(&in_dev->mc_tomb_lock);
1055 }
1056
1057 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1058 {
1059         struct ip_mc_list *pmc, *pmc_prev;
1060         struct ip_sf_list *psf, *psf_next;
1061
1062         spin_lock_bh(&in_dev->mc_tomb_lock);
1063         pmc_prev = NULL;
1064         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1065                 if (pmc->multiaddr == multiaddr)
1066                         break;
1067                 pmc_prev = pmc;
1068         }
1069         if (pmc) {
1070                 if (pmc_prev)
1071                         pmc_prev->next = pmc->next;
1072                 else
1073                         in_dev->mc_tomb = pmc->next;
1074         }
1075         spin_unlock_bh(&in_dev->mc_tomb_lock);
1076         if (pmc) {
1077                 for (psf=pmc->tomb; psf; psf=psf_next) {
1078                         psf_next = psf->sf_next;
1079                         kfree(psf);
1080                 }
1081                 in_dev_put(pmc->interface);
1082                 kfree(pmc);
1083         }
1084 }
1085
1086 static void igmpv3_clear_delrec(struct in_device *in_dev)
1087 {
1088         struct ip_mc_list *pmc, *nextpmc;
1089
1090         spin_lock_bh(&in_dev->mc_tomb_lock);
1091         pmc = in_dev->mc_tomb;
1092         in_dev->mc_tomb = NULL;
1093         spin_unlock_bh(&in_dev->mc_tomb_lock);
1094
1095         for (; pmc; pmc = nextpmc) {
1096                 nextpmc = pmc->next;
1097                 ip_mc_clear_src(pmc);
1098                 in_dev_put(pmc->interface);
1099                 kfree(pmc);
1100         }
1101         /* clear dead sources, too */
1102         read_lock(&in_dev->mc_list_lock);
1103         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1104                 struct ip_sf_list *psf, *psf_next;
1105
1106                 spin_lock_bh(&pmc->lock);
1107                 psf = pmc->tomb;
1108                 pmc->tomb = NULL;
1109                 spin_unlock_bh(&pmc->lock);
1110                 for (; psf; psf=psf_next) {
1111                         psf_next = psf->sf_next;
1112                         kfree(psf);
1113                 }
1114         }
1115         read_unlock(&in_dev->mc_list_lock);
1116 }
1117 #endif
1118
1119 static void igmp_group_dropped(struct ip_mc_list *im)
1120 {
1121         struct in_device *in_dev = im->interface;
1122 #ifdef CONFIG_IP_MULTICAST
1123         int reporter;
1124 #endif
1125
1126         if (im->loaded) {
1127                 im->loaded = 0;
1128                 ip_mc_filter_del(in_dev, im->multiaddr);
1129         }
1130
1131 #ifdef CONFIG_IP_MULTICAST
1132         if (im->multiaddr == IGMP_ALL_HOSTS)
1133                 return;
1134
1135         reporter = im->reporter;
1136         igmp_stop_timer(im);
1137
1138         if (!in_dev->dead) {
1139                 if (IGMP_V1_SEEN(in_dev))
1140                         goto done;
1141                 if (IGMP_V2_SEEN(in_dev)) {
1142                         if (reporter)
1143                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1144                         goto done;
1145                 }
1146                 /* IGMPv3 */
1147                 igmpv3_add_delrec(in_dev, im);
1148
1149                 igmp_ifc_event(in_dev);
1150         }
1151 done:
1152 #endif
1153         ip_mc_clear_src(im);
1154 }
1155
1156 static void igmp_group_added(struct ip_mc_list *im)
1157 {
1158         struct in_device *in_dev = im->interface;
1159
1160         if (im->loaded == 0) {
1161                 im->loaded = 1;
1162                 ip_mc_filter_add(in_dev, im->multiaddr);
1163         }
1164
1165 #ifdef CONFIG_IP_MULTICAST
1166         if (im->multiaddr == IGMP_ALL_HOSTS)
1167                 return;
1168
1169         if (in_dev->dead)
1170                 return;
1171         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1172                 spin_lock_bh(&im->lock);
1173                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1174                 spin_unlock_bh(&im->lock);
1175                 return;
1176         }
1177         /* else, v3 */
1178
1179         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1180                 IGMP_Unsolicited_Report_Count;
1181         igmp_ifc_event(in_dev);
1182 #endif
1183 }
1184
1185
1186 /*
1187  *      Multicast list managers
1188  */
1189
1190
1191 /*
1192  *      A socket has joined a multicast group on device dev.
1193  */
1194
1195 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1196 {
1197         struct ip_mc_list *im;
1198
1199         ASSERT_RTNL();
1200
1201         for (im=in_dev->mc_list; im; im=im->next) {
1202                 if (im->multiaddr == addr) {
1203                         im->users++;
1204                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1205                         goto out;
1206                 }
1207         }
1208
1209         im = kmalloc(sizeof(*im), GFP_KERNEL);
1210         if (!im)
1211                 goto out;
1212
1213         im->users=1;
1214         im->interface=in_dev;
1215         in_dev_hold(in_dev);
1216         im->multiaddr=addr;
1217         /* initial mode is (EX, empty) */
1218         im->sfmode = MCAST_EXCLUDE;
1219         im->sfcount[MCAST_INCLUDE] = 0;
1220         im->sfcount[MCAST_EXCLUDE] = 1;
1221         im->sources = NULL;
1222         im->tomb = NULL;
1223         im->crcount = 0;
1224         atomic_set(&im->refcnt, 1);
1225         spin_lock_init(&im->lock);
1226 #ifdef CONFIG_IP_MULTICAST
1227         im->tm_running=0;
1228         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1229         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1230         im->reporter = 0;
1231         im->gsquery = 0;
1232 #endif
1233         im->loaded = 0;
1234         write_lock_bh(&in_dev->mc_list_lock);
1235         im->next=in_dev->mc_list;
1236         in_dev->mc_list=im;
1237         write_unlock_bh(&in_dev->mc_list_lock);
1238 #ifdef CONFIG_IP_MULTICAST
1239         igmpv3_del_delrec(in_dev, im->multiaddr);
1240 #endif
1241         igmp_group_added(im);
1242         if (!in_dev->dead)
1243                 ip_rt_multicast_event(in_dev);
1244 out:
1245         return;
1246 }
1247
1248 /*
1249  *      Resend IGMP JOIN report; used for bonding.
1250  */
1251 void ip_mc_rejoin_group(struct ip_mc_list *im)
1252 {
1253 #ifdef CONFIG_IP_MULTICAST
1254         struct in_device *in_dev = im->interface;
1255
1256         if (im->multiaddr == IGMP_ALL_HOSTS)
1257                 return;
1258
1259         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1260                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1261                 return;
1262         }
1263         /* else, v3 */
1264         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1265                 IGMP_Unsolicited_Report_Count;
1266         igmp_ifc_event(in_dev);
1267 #endif
1268 }
1269
1270 /*
1271  *      A socket has left a multicast group on device dev
1272  */
1273
1274 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1275 {
1276         struct ip_mc_list *i, **ip;
1277
1278         ASSERT_RTNL();
1279
1280         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1281                 if (i->multiaddr==addr) {
1282                         if (--i->users == 0) {
1283                                 write_lock_bh(&in_dev->mc_list_lock);
1284                                 *ip = i->next;
1285                                 write_unlock_bh(&in_dev->mc_list_lock);
1286                                 igmp_group_dropped(i);
1287
1288                                 if (!in_dev->dead)
1289                                         ip_rt_multicast_event(in_dev);
1290
1291                                 ip_ma_put(i);
1292                                 return;
1293                         }
1294                         break;
1295                 }
1296         }
1297 }
1298
1299 /* Device going down */
1300
1301 void ip_mc_down(struct in_device *in_dev)
1302 {
1303         struct ip_mc_list *i;
1304
1305         ASSERT_RTNL();
1306
1307         for (i=in_dev->mc_list; i; i=i->next)
1308                 igmp_group_dropped(i);
1309
1310 #ifdef CONFIG_IP_MULTICAST
1311         in_dev->mr_ifc_count = 0;
1312         if (del_timer(&in_dev->mr_ifc_timer))
1313                 __in_dev_put(in_dev);
1314         in_dev->mr_gq_running = 0;
1315         if (del_timer(&in_dev->mr_gq_timer))
1316                 __in_dev_put(in_dev);
1317         igmpv3_clear_delrec(in_dev);
1318 #endif
1319
1320         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1321 }
1322
1323 void ip_mc_init_dev(struct in_device *in_dev)
1324 {
1325         ASSERT_RTNL();
1326
1327         in_dev->mc_tomb = NULL;
1328 #ifdef CONFIG_IP_MULTICAST
1329         in_dev->mr_gq_running = 0;
1330         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1331                         (unsigned long)in_dev);
1332         in_dev->mr_ifc_count = 0;
1333         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1334                         (unsigned long)in_dev);
1335         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1336 #endif
1337
1338         rwlock_init(&in_dev->mc_list_lock);
1339         spin_lock_init(&in_dev->mc_tomb_lock);
1340 }
1341
1342 /* Device going up */
1343
1344 void ip_mc_up(struct in_device *in_dev)
1345 {
1346         struct ip_mc_list *i;
1347
1348         ASSERT_RTNL();
1349
1350         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1351
1352         for (i=in_dev->mc_list; i; i=i->next)
1353                 igmp_group_added(i);
1354 }
1355
1356 /*
1357  *      Device is about to be destroyed: clean up.
1358  */
1359
1360 void ip_mc_destroy_dev(struct in_device *in_dev)
1361 {
1362         struct ip_mc_list *i;
1363
1364         ASSERT_RTNL();
1365
1366         /* Deactivate timers */
1367         ip_mc_down(in_dev);
1368
1369         write_lock_bh(&in_dev->mc_list_lock);
1370         while ((i = in_dev->mc_list) != NULL) {
1371                 in_dev->mc_list = i->next;
1372                 write_unlock_bh(&in_dev->mc_list_lock);
1373
1374                 igmp_group_dropped(i);
1375                 ip_ma_put(i);
1376
1377                 write_lock_bh(&in_dev->mc_list_lock);
1378         }
1379         write_unlock_bh(&in_dev->mc_list_lock);
1380 }
1381
1382 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1383 {
1384         struct flowi fl = { .nl_u = { .ip4_u =
1385                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1386         struct rtable *rt;
1387         struct net_device *dev = NULL;
1388         struct in_device *idev = NULL;
1389
1390         if (imr->imr_ifindex) {
1391                 idev = inetdev_by_index(&init_net, imr->imr_ifindex);
1392                 if (idev)
1393                         __in_dev_put(idev);
1394                 return idev;
1395         }
1396         if (imr->imr_address.s_addr) {
1397                 dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
1398                 if (!dev)
1399                         return NULL;
1400                 dev_put(dev);
1401         }
1402
1403         if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) {
1404                 dev = rt->u.dst.dev;
1405                 ip_rt_put(rt);
1406         }
1407         if (dev) {
1408                 imr->imr_ifindex = dev->ifindex;
1409                 idev = __in_dev_get_rtnl(dev);
1410         }
1411         return idev;
1412 }
1413
1414 /*
1415  *      Join a socket to a group
1416  */
1417 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1418 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1419
1420
1421 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1422         __be32 *psfsrc)
1423 {
1424         struct ip_sf_list *psf, *psf_prev;
1425         int rv = 0;
1426
1427         psf_prev = NULL;
1428         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1429                 if (psf->sf_inaddr == *psfsrc)
1430                         break;
1431                 psf_prev = psf;
1432         }
1433         if (!psf || psf->sf_count[sfmode] == 0) {
1434                 /* source filter not found, or count wrong =>  bug */
1435                 return -ESRCH;
1436         }
1437         psf->sf_count[sfmode]--;
1438         if (psf->sf_count[sfmode] == 0) {
1439                 ip_rt_multicast_event(pmc->interface);
1440         }
1441         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1442 #ifdef CONFIG_IP_MULTICAST
1443                 struct in_device *in_dev = pmc->interface;
1444 #endif
1445
1446                 /* no more filters for this source */
1447                 if (psf_prev)
1448                         psf_prev->sf_next = psf->sf_next;
1449                 else
1450                         pmc->sources = psf->sf_next;
1451 #ifdef CONFIG_IP_MULTICAST
1452                 if (psf->sf_oldin &&
1453                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1454                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1455                                 IGMP_Unsolicited_Report_Count;
1456                         psf->sf_next = pmc->tomb;
1457                         pmc->tomb = psf;
1458                         rv = 1;
1459                 } else
1460 #endif
1461                         kfree(psf);
1462         }
1463         return rv;
1464 }
1465
1466 #ifndef CONFIG_IP_MULTICAST
1467 #define igmp_ifc_event(x)       do { } while (0)
1468 #endif
1469
1470 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1471                          int sfcount, __be32 *psfsrc, int delta)
1472 {
1473         struct ip_mc_list *pmc;
1474         int     changerec = 0;
1475         int     i, err;
1476
1477         if (!in_dev)
1478                 return -ENODEV;
1479         read_lock(&in_dev->mc_list_lock);
1480         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1481                 if (*pmca == pmc->multiaddr)
1482                         break;
1483         }
1484         if (!pmc) {
1485                 /* MCA not found?? bug */
1486                 read_unlock(&in_dev->mc_list_lock);
1487                 return -ESRCH;
1488         }
1489         spin_lock_bh(&pmc->lock);
1490         read_unlock(&in_dev->mc_list_lock);
1491 #ifdef CONFIG_IP_MULTICAST
1492         sf_markstate(pmc);
1493 #endif
1494         if (!delta) {
1495                 err = -EINVAL;
1496                 if (!pmc->sfcount[sfmode])
1497                         goto out_unlock;
1498                 pmc->sfcount[sfmode]--;
1499         }
1500         err = 0;
1501         for (i=0; i<sfcount; i++) {
1502                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1503
1504                 changerec |= rv > 0;
1505                 if (!err && rv < 0)
1506                         err = rv;
1507         }
1508         if (pmc->sfmode == MCAST_EXCLUDE &&
1509             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1510             pmc->sfcount[MCAST_INCLUDE]) {
1511 #ifdef CONFIG_IP_MULTICAST
1512                 struct ip_sf_list *psf;
1513 #endif
1514
1515                 /* filter mode change */
1516                 pmc->sfmode = MCAST_INCLUDE;
1517 #ifdef CONFIG_IP_MULTICAST
1518                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1519                         IGMP_Unsolicited_Report_Count;
1520                 in_dev->mr_ifc_count = pmc->crcount;
1521                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1522                         psf->sf_crcount = 0;
1523                 igmp_ifc_event(pmc->interface);
1524         } else if (sf_setstate(pmc) || changerec) {
1525                 igmp_ifc_event(pmc->interface);
1526 #endif
1527         }
1528 out_unlock:
1529         spin_unlock_bh(&pmc->lock);
1530         return err;
1531 }
1532
1533 /*
1534  * Add multicast single-source filter to the interface list
1535  */
1536 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1537         __be32 *psfsrc, int delta)
1538 {
1539         struct ip_sf_list *psf, *psf_prev;
1540
1541         psf_prev = NULL;
1542         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1543                 if (psf->sf_inaddr == *psfsrc)
1544                         break;
1545                 psf_prev = psf;
1546         }
1547         if (!psf) {
1548                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1549                 if (!psf)
1550                         return -ENOBUFS;
1551                 psf->sf_inaddr = *psfsrc;
1552                 if (psf_prev) {
1553                         psf_prev->sf_next = psf;
1554                 } else
1555                         pmc->sources = psf;
1556         }
1557         psf->sf_count[sfmode]++;
1558         if (psf->sf_count[sfmode] == 1) {
1559                 ip_rt_multicast_event(pmc->interface);
1560         }
1561         return 0;
1562 }
1563
1564 #ifdef CONFIG_IP_MULTICAST
1565 static void sf_markstate(struct ip_mc_list *pmc)
1566 {
1567         struct ip_sf_list *psf;
1568         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1569
1570         for (psf=pmc->sources; psf; psf=psf->sf_next)
1571                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1572                         psf->sf_oldin = mca_xcount ==
1573                                 psf->sf_count[MCAST_EXCLUDE] &&
1574                                 !psf->sf_count[MCAST_INCLUDE];
1575                 } else
1576                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1577 }
1578
1579 static int sf_setstate(struct ip_mc_list *pmc)
1580 {
1581         struct ip_sf_list *psf, *dpsf;
1582         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1583         int qrv = pmc->interface->mr_qrv;
1584         int new_in, rv;
1585
1586         rv = 0;
1587         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1588                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1589                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1590                                 !psf->sf_count[MCAST_INCLUDE];
1591                 } else
1592                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1593                 if (new_in) {
1594                         if (!psf->sf_oldin) {
1595                                 struct ip_sf_list *prev = NULL;
1596
1597                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1598                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1599                                                 break;
1600                                         prev = dpsf;
1601                                 }
1602                                 if (dpsf) {
1603                                         if (prev)
1604                                                 prev->sf_next = dpsf->sf_next;
1605                                         else
1606                                                 pmc->tomb = dpsf->sf_next;
1607                                         kfree(dpsf);
1608                                 }
1609                                 psf->sf_crcount = qrv;
1610                                 rv++;
1611                         }
1612                 } else if (psf->sf_oldin) {
1613
1614                         psf->sf_crcount = 0;
1615                         /*
1616                          * add or update "delete" records if an active filter
1617                          * is now inactive
1618                          */
1619                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1620                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1621                                         break;
1622                         if (!dpsf) {
1623                                 dpsf = (struct ip_sf_list *)
1624                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1625                                 if (!dpsf)
1626                                         continue;
1627                                 *dpsf = *psf;
1628                                 /* pmc->lock held by callers */
1629                                 dpsf->sf_next = pmc->tomb;
1630                                 pmc->tomb = dpsf;
1631                         }
1632                         dpsf->sf_crcount = qrv;
1633                         rv++;
1634                 }
1635         }
1636         return rv;
1637 }
1638 #endif
1639
1640 /*
1641  * Add multicast source filter list to the interface list
1642  */
1643 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1644                          int sfcount, __be32 *psfsrc, int delta)
1645 {
1646         struct ip_mc_list *pmc;
1647         int     isexclude;
1648         int     i, err;
1649
1650         if (!in_dev)
1651                 return -ENODEV;
1652         read_lock(&in_dev->mc_list_lock);
1653         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1654                 if (*pmca == pmc->multiaddr)
1655                         break;
1656         }
1657         if (!pmc) {
1658                 /* MCA not found?? bug */
1659                 read_unlock(&in_dev->mc_list_lock);
1660                 return -ESRCH;
1661         }
1662         spin_lock_bh(&pmc->lock);
1663         read_unlock(&in_dev->mc_list_lock);
1664
1665 #ifdef CONFIG_IP_MULTICAST
1666         sf_markstate(pmc);
1667 #endif
1668         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1669         if (!delta)
1670                 pmc->sfcount[sfmode]++;
1671         err = 0;
1672         for (i=0; i<sfcount; i++) {
1673                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1674                 if (err)
1675                         break;
1676         }
1677         if (err) {
1678                 int j;
1679
1680                 pmc->sfcount[sfmode]--;
1681                 for (j=0; j<i; j++)
1682                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1683         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1684 #ifdef CONFIG_IP_MULTICAST
1685                 struct ip_sf_list *psf;
1686                 in_dev = pmc->interface;
1687 #endif
1688
1689                 /* filter mode change */
1690                 if (pmc->sfcount[MCAST_EXCLUDE])
1691                         pmc->sfmode = MCAST_EXCLUDE;
1692                 else if (pmc->sfcount[MCAST_INCLUDE])
1693                         pmc->sfmode = MCAST_INCLUDE;
1694 #ifdef CONFIG_IP_MULTICAST
1695                 /* else no filters; keep old mode for reports */
1696
1697                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1698                         IGMP_Unsolicited_Report_Count;
1699                 in_dev->mr_ifc_count = pmc->crcount;
1700                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1701                         psf->sf_crcount = 0;
1702                 igmp_ifc_event(in_dev);
1703         } else if (sf_setstate(pmc)) {
1704                 igmp_ifc_event(in_dev);
1705 #endif
1706         }
1707         spin_unlock_bh(&pmc->lock);
1708         return err;
1709 }
1710
1711 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1712 {
1713         struct ip_sf_list *psf, *nextpsf;
1714
1715         for (psf=pmc->tomb; psf; psf=nextpsf) {
1716                 nextpsf = psf->sf_next;
1717                 kfree(psf);
1718         }
1719         pmc->tomb = NULL;
1720         for (psf=pmc->sources; psf; psf=nextpsf) {
1721                 nextpsf = psf->sf_next;
1722                 kfree(psf);
1723         }
1724         pmc->sources = NULL;
1725         pmc->sfmode = MCAST_EXCLUDE;
1726         pmc->sfcount[MCAST_INCLUDE] = 0;
1727         pmc->sfcount[MCAST_EXCLUDE] = 1;
1728 }
1729
1730
1731 /*
1732  * Join a multicast group
1733  */
1734 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1735 {
1736         int err;
1737         __be32 addr = imr->imr_multiaddr.s_addr;
1738         struct ip_mc_socklist *iml=NULL, *i;
1739         struct in_device *in_dev;
1740         struct inet_sock *inet = inet_sk(sk);
1741         int ifindex;
1742         int count = 0;
1743
1744         if (!ipv4_is_multicast(addr))
1745                 return -EINVAL;
1746
1747         rtnl_lock();
1748
1749         in_dev = ip_mc_find_dev(imr);
1750
1751         if (!in_dev) {
1752                 iml = NULL;
1753                 err = -ENODEV;
1754                 goto done;
1755         }
1756
1757         err = -EADDRINUSE;
1758         ifindex = imr->imr_ifindex;
1759         for (i = inet->mc_list; i; i = i->next) {
1760                 if (i->multi.imr_multiaddr.s_addr == addr &&
1761                     i->multi.imr_ifindex == ifindex)
1762                         goto done;
1763                 count++;
1764         }
1765         err = -ENOBUFS;
1766         if (count >= sysctl_igmp_max_memberships)
1767                 goto done;
1768         iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1769         if (iml == NULL)
1770                 goto done;
1771
1772         memcpy(&iml->multi, imr, sizeof(*imr));
1773         iml->next = inet->mc_list;
1774         iml->sflist = NULL;
1775         iml->sfmode = MCAST_EXCLUDE;
1776         inet->mc_list = iml;
1777         ip_mc_inc_group(in_dev, addr);
1778         err = 0;
1779 done:
1780         rtnl_unlock();
1781         return err;
1782 }
1783
1784 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1785                            struct in_device *in_dev)
1786 {
1787         int err;
1788
1789         if (iml->sflist == NULL) {
1790                 /* any-source empty exclude case */
1791                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1792                         iml->sfmode, 0, NULL, 0);
1793         }
1794         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1795                         iml->sfmode, iml->sflist->sl_count,
1796                         iml->sflist->sl_addr, 0);
1797         sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1798         iml->sflist = NULL;
1799         return err;
1800 }
1801
1802 /*
1803  *      Ask a socket to leave a group.
1804  */
1805
1806 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1807 {
1808         struct inet_sock *inet = inet_sk(sk);
1809         struct ip_mc_socklist *iml, **imlp;
1810         struct in_device *in_dev;
1811         __be32 group = imr->imr_multiaddr.s_addr;
1812         u32 ifindex;
1813         int ret = -EADDRNOTAVAIL;
1814
1815         rtnl_lock();
1816         in_dev = ip_mc_find_dev(imr);
1817         ifindex = imr->imr_ifindex;
1818         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1819                 if (iml->multi.imr_multiaddr.s_addr != group)
1820                         continue;
1821                 if (ifindex) {
1822                         if (iml->multi.imr_ifindex != ifindex)
1823                                 continue;
1824                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1825                                 iml->multi.imr_address.s_addr)
1826                         continue;
1827
1828                 (void) ip_mc_leave_src(sk, iml, in_dev);
1829
1830                 *imlp = iml->next;
1831
1832                 if (in_dev)
1833                         ip_mc_dec_group(in_dev, group);
1834                 rtnl_unlock();
1835                 sock_kfree_s(sk, iml, sizeof(*iml));
1836                 return 0;
1837         }
1838         if (!in_dev)
1839                 ret = -ENODEV;
1840         rtnl_unlock();
1841         return ret;
1842 }
1843
1844 int ip_mc_source(int add, int omode, struct sock *sk, struct
1845         ip_mreq_source *mreqs, int ifindex)
1846 {
1847         int err;
1848         struct ip_mreqn imr;
1849         __be32 addr = mreqs->imr_multiaddr;
1850         struct ip_mc_socklist *pmc;
1851         struct in_device *in_dev = NULL;
1852         struct inet_sock *inet = inet_sk(sk);
1853         struct ip_sf_socklist *psl;
1854         int leavegroup = 0;
1855         int i, j, rv;
1856
1857         if (!ipv4_is_multicast(addr))
1858                 return -EINVAL;
1859
1860         rtnl_lock();
1861
1862         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1863         imr.imr_address.s_addr = mreqs->imr_interface;
1864         imr.imr_ifindex = ifindex;
1865         in_dev = ip_mc_find_dev(&imr);
1866
1867         if (!in_dev) {
1868                 err = -ENODEV;
1869                 goto done;
1870         }
1871         err = -EADDRNOTAVAIL;
1872
1873         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1874                 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1875                     && pmc->multi.imr_ifindex == imr.imr_ifindex)
1876                         break;
1877         }
1878         if (!pmc) {             /* must have a prior join */
1879                 err = -EINVAL;
1880                 goto done;
1881         }
1882         /* if a source filter was set, must be the same mode as before */
1883         if (pmc->sflist) {
1884                 if (pmc->sfmode != omode) {
1885                         err = -EINVAL;
1886                         goto done;
1887                 }
1888         } else if (pmc->sfmode != omode) {
1889                 /* allow mode switches for empty-set filters */
1890                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1891                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1892                         NULL, 0);
1893                 pmc->sfmode = omode;
1894         }
1895
1896         psl = pmc->sflist;
1897         if (!add) {
1898                 if (!psl)
1899                         goto done;      /* err = -EADDRNOTAVAIL */
1900                 rv = !0;
1901                 for (i=0; i<psl->sl_count; i++) {
1902                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1903                                 sizeof(__be32));
1904                         if (rv == 0)
1905                                 break;
1906                 }
1907                 if (rv)         /* source not found */
1908                         goto done;      /* err = -EADDRNOTAVAIL */
1909
1910                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1911                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1912                         leavegroup = 1;
1913                         goto done;
1914                 }
1915
1916                 /* update the interface filter */
1917                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1918                         &mreqs->imr_sourceaddr, 1);
1919
1920                 for (j=i+1; j<psl->sl_count; j++)
1921                         psl->sl_addr[j-1] = psl->sl_addr[j];
1922                 psl->sl_count--;
1923                 err = 0;
1924                 goto done;
1925         }
1926         /* else, add a new source to the filter */
1927
1928         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1929                 err = -ENOBUFS;
1930                 goto done;
1931         }
1932         if (!psl || psl->sl_count == psl->sl_max) {
1933                 struct ip_sf_socklist *newpsl;
1934                 int count = IP_SFBLOCK;
1935
1936                 if (psl)
1937                         count += psl->sl_max;
1938                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1939                 if (!newpsl) {
1940                         err = -ENOBUFS;
1941                         goto done;
1942                 }
1943                 newpsl->sl_max = count;
1944                 newpsl->sl_count = count - IP_SFBLOCK;
1945                 if (psl) {
1946                         for (i=0; i<psl->sl_count; i++)
1947                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1948                         sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1949                 }
1950                 pmc->sflist = psl = newpsl;
1951         }
1952         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1953         for (i=0; i<psl->sl_count; i++) {
1954                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1955                         sizeof(__be32));
1956                 if (rv == 0)
1957                         break;
1958         }
1959         if (rv == 0)            /* address already there is an error */
1960                 goto done;
1961         for (j=psl->sl_count-1; j>=i; j--)
1962                 psl->sl_addr[j+1] = psl->sl_addr[j];
1963         psl->sl_addr[i] = mreqs->imr_sourceaddr;
1964         psl->sl_count++;
1965         err = 0;
1966         /* update the interface list */
1967         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1968                 &mreqs->imr_sourceaddr, 1);
1969 done:
1970         rtnl_unlock();
1971         if (leavegroup)
1972                 return ip_mc_leave_group(sk, &imr);
1973         return err;
1974 }
1975
1976 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1977 {
1978         int err = 0;
1979         struct ip_mreqn imr;
1980         __be32 addr = msf->imsf_multiaddr;
1981         struct ip_mc_socklist *pmc;
1982         struct in_device *in_dev;
1983         struct inet_sock *inet = inet_sk(sk);
1984         struct ip_sf_socklist *newpsl, *psl;
1985         int leavegroup = 0;
1986
1987         if (!ipv4_is_multicast(addr))
1988                 return -EINVAL;
1989         if (msf->imsf_fmode != MCAST_INCLUDE &&
1990             msf->imsf_fmode != MCAST_EXCLUDE)
1991                 return -EINVAL;
1992
1993         rtnl_lock();
1994
1995         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1996         imr.imr_address.s_addr = msf->imsf_interface;
1997         imr.imr_ifindex = ifindex;
1998         in_dev = ip_mc_find_dev(&imr);
1999
2000         if (!in_dev) {
2001                 err = -ENODEV;
2002                 goto done;
2003         }
2004
2005         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2006         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2007                 leavegroup = 1;
2008                 goto done;
2009         }
2010
2011         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2012                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2013                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2014                         break;
2015         }
2016         if (!pmc) {             /* must have a prior join */
2017                 err = -EINVAL;
2018                 goto done;
2019         }
2020         if (msf->imsf_numsrc) {
2021                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2022                                                            GFP_KERNEL);
2023                 if (!newpsl) {
2024                         err = -ENOBUFS;
2025                         goto done;
2026                 }
2027                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2028                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2029                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2030                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2031                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2032                 if (err) {
2033                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2034                         goto done;
2035                 }
2036         } else {
2037                 newpsl = NULL;
2038                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2039                                      msf->imsf_fmode, 0, NULL, 0);
2040         }
2041         psl = pmc->sflist;
2042         if (psl) {
2043                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2044                         psl->sl_count, psl->sl_addr, 0);
2045                 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2046         } else
2047                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2048                         0, NULL, 0);
2049         pmc->sflist = newpsl;
2050         pmc->sfmode = msf->imsf_fmode;
2051         err = 0;
2052 done:
2053         rtnl_unlock();
2054         if (leavegroup)
2055                 err = ip_mc_leave_group(sk, &imr);
2056         return err;
2057 }
2058
2059 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2060         struct ip_msfilter __user *optval, int __user *optlen)
2061 {
2062         int err, len, count, copycount;
2063         struct ip_mreqn imr;
2064         __be32 addr = msf->imsf_multiaddr;
2065         struct ip_mc_socklist *pmc;
2066         struct in_device *in_dev;
2067         struct inet_sock *inet = inet_sk(sk);
2068         struct ip_sf_socklist *psl;
2069
2070         if (!ipv4_is_multicast(addr))
2071                 return -EINVAL;
2072
2073         rtnl_lock();
2074
2075         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2076         imr.imr_address.s_addr = msf->imsf_interface;
2077         imr.imr_ifindex = 0;
2078         in_dev = ip_mc_find_dev(&imr);
2079
2080         if (!in_dev) {
2081                 err = -ENODEV;
2082                 goto done;
2083         }
2084         err = -EADDRNOTAVAIL;
2085
2086         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2087                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2088                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2089                         break;
2090         }
2091         if (!pmc)               /* must have a prior join */
2092                 goto done;
2093         msf->imsf_fmode = pmc->sfmode;
2094         psl = pmc->sflist;
2095         rtnl_unlock();
2096         if (!psl) {
2097                 len = 0;
2098                 count = 0;
2099         } else {
2100                 count = psl->sl_count;
2101         }
2102         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2103         len = copycount * sizeof(psl->sl_addr[0]);
2104         msf->imsf_numsrc = count;
2105         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2106             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2107                 return -EFAULT;
2108         }
2109         if (len &&
2110             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2111                 return -EFAULT;
2112         return 0;
2113 done:
2114         rtnl_unlock();
2115         return err;
2116 }
2117
2118 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2119         struct group_filter __user *optval, int __user *optlen)
2120 {
2121         int err, i, count, copycount;
2122         struct sockaddr_in *psin;
2123         __be32 addr;
2124         struct ip_mc_socklist *pmc;
2125         struct inet_sock *inet = inet_sk(sk);
2126         struct ip_sf_socklist *psl;
2127
2128         psin = (struct sockaddr_in *)&gsf->gf_group;
2129         if (psin->sin_family != AF_INET)
2130                 return -EINVAL;
2131         addr = psin->sin_addr.s_addr;
2132         if (!ipv4_is_multicast(addr))
2133                 return -EINVAL;
2134
2135         rtnl_lock();
2136
2137         err = -EADDRNOTAVAIL;
2138
2139         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2140                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2141                     pmc->multi.imr_ifindex == gsf->gf_interface)
2142                         break;
2143         }
2144         if (!pmc)               /* must have a prior join */
2145                 goto done;
2146         gsf->gf_fmode = pmc->sfmode;
2147         psl = pmc->sflist;
2148         rtnl_unlock();
2149         count = psl ? psl->sl_count : 0;
2150         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2151         gsf->gf_numsrc = count;
2152         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2153             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2154                 return -EFAULT;
2155         }
2156         for (i=0; i<copycount; i++) {
2157                 struct sockaddr_storage ss;
2158
2159                 psin = (struct sockaddr_in *)&ss;
2160                 memset(&ss, 0, sizeof(ss));
2161                 psin->sin_family = AF_INET;
2162                 psin->sin_addr.s_addr = psl->sl_addr[i];
2163                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2164                         return -EFAULT;
2165         }
2166         return 0;
2167 done:
2168         rtnl_unlock();
2169         return err;
2170 }
2171
2172 /*
2173  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2174  */
2175 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2176 {
2177         struct inet_sock *inet = inet_sk(sk);
2178         struct ip_mc_socklist *pmc;
2179         struct ip_sf_socklist *psl;
2180         int i;
2181
2182         if (!ipv4_is_multicast(loc_addr))
2183                 return 1;
2184
2185         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2186                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2187                     pmc->multi.imr_ifindex == dif)
2188                         break;
2189         }
2190         if (!pmc)
2191                 return 1;
2192         psl = pmc->sflist;
2193         if (!psl)
2194                 return pmc->sfmode == MCAST_EXCLUDE;
2195
2196         for (i=0; i<psl->sl_count; i++) {
2197                 if (psl->sl_addr[i] == rmt_addr)
2198                         break;
2199         }
2200         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2201                 return 0;
2202         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2203                 return 0;
2204         return 1;
2205 }
2206
2207 /*
2208  *      A socket is closing.
2209  */
2210
2211 void ip_mc_drop_socket(struct sock *sk)
2212 {
2213         struct inet_sock *inet = inet_sk(sk);
2214         struct ip_mc_socklist *iml;
2215
2216         if (inet->mc_list == NULL)
2217                 return;
2218
2219         rtnl_lock();
2220         while ((iml = inet->mc_list) != NULL) {
2221                 struct in_device *in_dev;
2222                 inet->mc_list = iml->next;
2223
2224                 in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex);
2225                 (void) ip_mc_leave_src(sk, iml, in_dev);
2226                 if (in_dev != NULL) {
2227                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2228                         in_dev_put(in_dev);
2229                 }
2230                 sock_kfree_s(sk, iml, sizeof(*iml));
2231         }
2232         rtnl_unlock();
2233 }
2234
2235 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2236 {
2237         struct ip_mc_list *im;
2238         struct ip_sf_list *psf;
2239         int rv = 0;
2240
2241         read_lock(&in_dev->mc_list_lock);
2242         for (im=in_dev->mc_list; im; im=im->next) {
2243                 if (im->multiaddr == mc_addr)
2244                         break;
2245         }
2246         if (im && proto == IPPROTO_IGMP) {
2247                 rv = 1;
2248         } else if (im) {
2249                 if (src_addr) {
2250                         for (psf=im->sources; psf; psf=psf->sf_next) {
2251                                 if (psf->sf_inaddr == src_addr)
2252                                         break;
2253                         }
2254                         if (psf)
2255                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2256                                         psf->sf_count[MCAST_EXCLUDE] !=
2257                                         im->sfcount[MCAST_EXCLUDE];
2258                         else
2259                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2260                 } else
2261                         rv = 1; /* unspecified source; tentatively allow */
2262         }
2263         read_unlock(&in_dev->mc_list_lock);
2264         return rv;
2265 }
2266
2267 #if defined(CONFIG_PROC_FS)
2268 struct igmp_mc_iter_state {
2269         struct net_device *dev;
2270         struct in_device *in_dev;
2271 };
2272
2273 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2274
2275 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2276 {
2277         struct ip_mc_list *im = NULL;
2278         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2279
2280         state->in_dev = NULL;
2281         for_each_netdev(&init_net, state->dev) {
2282                 struct in_device *in_dev;
2283                 in_dev = in_dev_get(state->dev);
2284                 if (!in_dev)
2285                         continue;
2286                 read_lock(&in_dev->mc_list_lock);
2287                 im = in_dev->mc_list;
2288                 if (im) {
2289                         state->in_dev = in_dev;
2290                         break;
2291                 }
2292                 read_unlock(&in_dev->mc_list_lock);
2293                 in_dev_put(in_dev);
2294         }
2295         return im;
2296 }
2297
2298 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2299 {
2300         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2301         im = im->next;
2302         while (!im) {
2303                 if (likely(state->in_dev != NULL)) {
2304                         read_unlock(&state->in_dev->mc_list_lock);
2305                         in_dev_put(state->in_dev);
2306                 }
2307                 state->dev = next_net_device(state->dev);
2308                 if (!state->dev) {
2309                         state->in_dev = NULL;
2310                         break;
2311                 }
2312                 state->in_dev = in_dev_get(state->dev);
2313                 if (!state->in_dev)
2314                         continue;
2315                 read_lock(&state->in_dev->mc_list_lock);
2316                 im = state->in_dev->mc_list;
2317         }
2318         return im;
2319 }
2320
2321 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2322 {
2323         struct ip_mc_list *im = igmp_mc_get_first(seq);
2324         if (im)
2325                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2326                         --pos;
2327         return pos ? NULL : im;
2328 }
2329
2330 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2331         __acquires(dev_base_lock)
2332 {
2333         read_lock(&dev_base_lock);
2334         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2335 }
2336
2337 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2338 {
2339         struct ip_mc_list *im;
2340         if (v == SEQ_START_TOKEN)
2341                 im = igmp_mc_get_first(seq);
2342         else
2343                 im = igmp_mc_get_next(seq, v);
2344         ++*pos;
2345         return im;
2346 }
2347
2348 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2349         __releases(dev_base_lock)
2350 {
2351         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2352         if (likely(state->in_dev != NULL)) {
2353                 read_unlock(&state->in_dev->mc_list_lock);
2354                 in_dev_put(state->in_dev);
2355                 state->in_dev = NULL;
2356         }
2357         state->dev = NULL;
2358         read_unlock(&dev_base_lock);
2359 }
2360
2361 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2362 {
2363         if (v == SEQ_START_TOKEN)
2364                 seq_puts(seq,
2365                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2366         else {
2367                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2368                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2369                 char   *querier;
2370 #ifdef CONFIG_IP_MULTICAST
2371                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2372                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2373                           "V3";
2374 #else
2375                 querier = "NONE";
2376 #endif
2377
2378                 if (state->in_dev->mc_list == im) {
2379                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2380                                    state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2381                 }
2382
2383                 seq_printf(seq,
2384                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2385                            im->multiaddr, im->users,
2386                            im->tm_running, im->tm_running ?
2387                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2388                            im->reporter);
2389         }
2390         return 0;
2391 }
2392
2393 static const struct seq_operations igmp_mc_seq_ops = {
2394         .start  =       igmp_mc_seq_start,
2395         .next   =       igmp_mc_seq_next,
2396         .stop   =       igmp_mc_seq_stop,
2397         .show   =       igmp_mc_seq_show,
2398 };
2399
2400 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2401 {
2402         return seq_open_private(file, &igmp_mc_seq_ops,
2403                         sizeof(struct igmp_mc_iter_state));
2404 }
2405
2406 static const struct file_operations igmp_mc_seq_fops = {
2407         .owner          =       THIS_MODULE,
2408         .open           =       igmp_mc_seq_open,
2409         .read           =       seq_read,
2410         .llseek         =       seq_lseek,
2411         .release        =       seq_release_private,
2412 };
2413
2414 struct igmp_mcf_iter_state {
2415         struct net_device *dev;
2416         struct in_device *idev;
2417         struct ip_mc_list *im;
2418 };
2419
2420 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2421
2422 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2423 {
2424         struct ip_sf_list *psf = NULL;
2425         struct ip_mc_list *im = NULL;
2426         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2427
2428         state->idev = NULL;
2429         state->im = NULL;
2430         for_each_netdev(&init_net, state->dev) {
2431                 struct in_device *idev;
2432                 idev = in_dev_get(state->dev);
2433                 if (unlikely(idev == NULL))
2434                         continue;
2435                 read_lock(&idev->mc_list_lock);
2436                 im = idev->mc_list;
2437                 if (likely(im != NULL)) {
2438                         spin_lock_bh(&im->lock);
2439                         psf = im->sources;
2440                         if (likely(psf != NULL)) {
2441                                 state->im = im;
2442                                 state->idev = idev;
2443                                 break;
2444                         }
2445                         spin_unlock_bh(&im->lock);
2446                 }
2447                 read_unlock(&idev->mc_list_lock);
2448                 in_dev_put(idev);
2449         }
2450         return psf;
2451 }
2452
2453 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2454 {
2455         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2456
2457         psf = psf->sf_next;
2458         while (!psf) {
2459                 spin_unlock_bh(&state->im->lock);
2460                 state->im = state->im->next;
2461                 while (!state->im) {
2462                         if (likely(state->idev != NULL)) {
2463                                 read_unlock(&state->idev->mc_list_lock);
2464                                 in_dev_put(state->idev);
2465                         }
2466                         state->dev = next_net_device(state->dev);
2467                         if (!state->dev) {
2468                                 state->idev = NULL;
2469                                 goto out;
2470                         }
2471                         state->idev = in_dev_get(state->dev);
2472                         if (!state->idev)
2473                                 continue;
2474                         read_lock(&state->idev->mc_list_lock);
2475                         state->im = state->idev->mc_list;
2476                 }
2477                 if (!state->im)
2478                         break;
2479                 spin_lock_bh(&state->im->lock);
2480                 psf = state->im->sources;
2481         }
2482 out:
2483         return psf;
2484 }
2485
2486 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2487 {
2488         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2489         if (psf)
2490                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2491                         --pos;
2492         return pos ? NULL : psf;
2493 }
2494
2495 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2496 {
2497         read_lock(&dev_base_lock);
2498         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2499 }
2500
2501 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2502 {
2503         struct ip_sf_list *psf;
2504         if (v == SEQ_START_TOKEN)
2505                 psf = igmp_mcf_get_first(seq);
2506         else
2507                 psf = igmp_mcf_get_next(seq, v);
2508         ++*pos;
2509         return psf;
2510 }
2511
2512 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2513 {
2514         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2515         if (likely(state->im != NULL)) {
2516                 spin_unlock_bh(&state->im->lock);
2517                 state->im = NULL;
2518         }
2519         if (likely(state->idev != NULL)) {
2520                 read_unlock(&state->idev->mc_list_lock);
2521                 in_dev_put(state->idev);
2522                 state->idev = NULL;
2523         }
2524         state->dev = NULL;
2525         read_unlock(&dev_base_lock);
2526 }
2527
2528 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2529 {
2530         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2531         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2532
2533         if (v == SEQ_START_TOKEN) {
2534                 seq_printf(seq,
2535                            "%3s %6s "
2536                            "%10s %10s %6s %6s\n", "Idx",
2537                            "Device", "MCA",
2538                            "SRC", "INC", "EXC");
2539         } else {
2540                 seq_printf(seq,
2541                            "%3d %6.6s 0x%08x "
2542                            "0x%08x %6lu %6lu\n",
2543                            state->dev->ifindex, state->dev->name,
2544                            ntohl(state->im->multiaddr),
2545                            ntohl(psf->sf_inaddr),
2546                            psf->sf_count[MCAST_INCLUDE],
2547                            psf->sf_count[MCAST_EXCLUDE]);
2548         }
2549         return 0;
2550 }
2551
2552 static const struct seq_operations igmp_mcf_seq_ops = {
2553         .start  =       igmp_mcf_seq_start,
2554         .next   =       igmp_mcf_seq_next,
2555         .stop   =       igmp_mcf_seq_stop,
2556         .show   =       igmp_mcf_seq_show,
2557 };
2558
2559 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2560 {
2561         return seq_open_private(file, &igmp_mcf_seq_ops,
2562                         sizeof(struct igmp_mcf_iter_state));
2563 }
2564
2565 static const struct file_operations igmp_mcf_seq_fops = {
2566         .owner          =       THIS_MODULE,
2567         .open           =       igmp_mcf_seq_open,
2568         .read           =       seq_read,
2569         .llseek         =       seq_lseek,
2570         .release        =       seq_release_private,
2571 };
2572
2573 int __init igmp_mc_proc_init(void)
2574 {
2575         proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2576         proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2577         return 0;
2578 }
2579 #endif
2580
2581 EXPORT_SYMBOL(ip_mc_dec_group);
2582 EXPORT_SYMBOL(ip_mc_inc_group);
2583 EXPORT_SYMBOL(ip_mc_join_group);
2584 EXPORT_SYMBOL(ip_mc_rejoin_group);