net/ipv4/igmp.c

   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Authors:
  12  *              Alan Cox <alan@lxorguk.ukuu.org.uk>
  13  *
  14  *      This program is free software; you can redistribute it and/or
  15  *      modify it under the terms of the GNU General Public License
  16  *      as published by the Free Software Foundation; either version
  17  *      2 of the License, or (at your option) any later version.
  18  *
  19  *      Fixes:
  20  *
  21  *              Alan Cox        :       Added lots of __inline__ to optimise
  22  *                                      the memory usage of all the tiny little
  23  *                                      functions.
  24  *              Alan Cox        :       Dumped the header building experiment.
  25  *              Alan Cox        :       Minor tweaks ready for multicast routing
  26  *                                      and extended IGMP protocol.
  27  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  28  *                                      writes utterly bogus code otherwise (sigh)
  29  *                                      fixed IGMP loopback to behave in the manner
  30  *                                      desired by mrouted, fixed the fact it has been
  31  *                                      broken since 1.3.6 and cleaned up a few minor
  32  *                                      points.
  33  *
  34  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  35  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  36  *                                      The enhancements are mainly based on Steve Deering's
  37  *                                      ipmulti-3.5 source code.
  38  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  39  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  40  *                                      the mrouted version on that device.
  41  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  42  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  43  *                                      to identify the multicast router version
  44  *                                      and do what the IGMP version 2 specified.
  45  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  46  *              Tsu-Sheng Tsao          if the specified time expired.
  47  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  48  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  49  *              Christian Daudt :       igmp timer wasn't set for local group
  50  *                                      memberships but was being deleted,
  51  *                                      which caused a "del_timer() called
  52  *                                      from %p with timer not initialized\n"
  53  *                                      message (960131).
  54  *              Christian Daudt :       removed del_timer from
  55  *                                      igmp_timer_expire function (960205).
  56  *             Christian Daudt :       igmp_heard_report now only calls
  57  *                                     igmp_timer_expire if tm->running is
  58  *                                     true (960216).
  59  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  60  *                                      igmp_heard_query never trigger. Expiry
  61  *                                      miscalculation fixed in igmp_heard_query
  62  *                                      and random() made to return unsigned to
  63  *                                      prevent negative expiry times.
  64  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  65  *                                      fix from pending 2.1.x patches.
  66  *              Alan Cox:               Forget to enable FDDI support earlier.
  67  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  68  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  69  *              David L Stevens:        IGMPv3 support, with help from
  70  *                                      Vinay Kulkarni
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/slab.h>
  75 #include <asm/uaccess.h>
  76 #include <asm/system.h>
  77 #include <linux/types.h>
  78 #include <linux/kernel.h>
  79 #include <linux/jiffies.h>
  80 #include <linux/string.h>
  81 #include <linux/socket.h>
  82 #include <linux/sockios.h>
  83 #include <linux/in.h>
  84 #include <linux/inet.h>
  85 #include <linux/netdevice.h>
  86 #include <linux/skbuff.h>
  87 #include <linux/inetdevice.h>
  88 #include <linux/igmp.h>
  89 #include <linux/if_arp.h>
  90 #include <linux/rtnetlink.h>
  91 #include <linux/times.h>
  92
  93 #include <net/net_namespace.h>
  94 #include <net/arp.h>
  95 #include <net/ip.h>
  96 #include <net/protocol.h>
  97 #include <net/route.h>
  98 #include <net/sock.h>
  99 #include <net/checksum.h>
 100 #include <linux/netfilter_ipv4.h>
 101 #ifdef CONFIG_IP_MROUTE
 102 #include <linux/mroute.h>
 103 #endif
 104 #ifdef CONFIG_PROC_FS
 105 #include <linux/proc_fs.h>
 106 #include <linux/seq_file.h>
 107 #endif
 108
 109 #define IP_MAX_MEMBERSHIPS      20
 110 #define IP_MAX_MSF              10
 111
 112 #ifdef CONFIG_IP_MULTICAST
 113 /* Parameter names and values are taken from igmp-v2-06 draft */
 114
 115 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 116 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 117 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 118 #define IGMP_Query_Response_Interval            (10*HZ)
 119 #define IGMP_Unsolicited_Report_Count           2
 120
 121
 122 #define IGMP_Initial_Report_Delay               (1)
 123
 124 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 125  * IGMP specs require to report membership immediately after
 126  * joining a group, but we delay the first report by a
 127  * small interval. It seems more natural and still does not
 128  * contradict to specs provided this delay is small enough.
 129  */
 130
 131 #define IGMP_V1_SEEN(in_dev) \
 132         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 133          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 134          ((in_dev)->mr_v1_seen && \
 135           time_before(jiffies, (in_dev)->mr_v1_seen)))
 136 #define IGMP_V2_SEEN(in_dev) \
 137         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 138          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 139          ((in_dev)->mr_v2_seen && \
 140           time_before(jiffies, (in_dev)->mr_v2_seen)))
 141
 142 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 143 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 144 static void igmpv3_clear_delrec(struct in_device *in_dev);
 145 static int sf_setstate(struct ip_mc_list *pmc);
 146 static void sf_markstate(struct ip_mc_list *pmc);
 147 #endif
 148 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 149 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 150                          int sfcount, __be32 *psfsrc, int delta);
 151
 152 static void ip_ma_put(struct ip_mc_list *im)
 153 {
 154         if (atomic_dec_and_test(&im->refcnt)) {
 155                 in_dev_put(im->interface);
 156                 kfree(im);
 157         }
 158 }
 159
 160 #ifdef CONFIG_IP_MULTICAST
 161
 162 /*
 163  *      Timer management
 164  */
 165
 166 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 167 {
 168         spin_lock_bh(&im->lock);
 169         if (del_timer(&im->timer))
 170                 atomic_dec(&im->refcnt);
 171         im->tm_running = 0;
 172         im->reporter = 0;
 173         im->unsolicit_count = 0;
 174         spin_unlock_bh(&im->lock);
 175 }
 176
 177 /* It must be called with locked im->lock */
 178 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 179 {
 180         int tv = net_random() % max_delay;
 181
 182         im->tm_running = 1;
 183         if (!mod_timer(&im->timer, jiffies+tv+2))
 184                 atomic_inc(&im->refcnt);
 185 }
 186
 187 static void igmp_gq_start_timer(struct in_device *in_dev)
 188 {
 189         int tv = net_random() % in_dev->mr_maxdelay;
 190
 191         in_dev->mr_gq_running = 1;
 192         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 193                 in_dev_hold(in_dev);
 194 }
 195
 196 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 197 {
 198         int tv = net_random() % delay;
 199
 200         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 201                 in_dev_hold(in_dev);
 202 }
 203
 204 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 205 {
 206         spin_lock_bh(&im->lock);
 207         im->unsolicit_count = 0;
 208         if (del_timer(&im->timer)) {
 209                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 210                         add_timer(&im->timer);
 211                         im->tm_running = 1;
 212                         spin_unlock_bh(&im->lock);
 213                         return;
 214                 }
 215                 atomic_dec(&im->refcnt);
 216         }
 217         igmp_start_timer(im, max_delay);
 218         spin_unlock_bh(&im->lock);
 219 }
 220
 221
 222 /*
 223  *      Send an IGMP report.
 224  */
 225
 226 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 227
 228
 229 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 230         int gdeleted, int sdeleted)
 231 {
 232         switch (type) {
 233         case IGMPV3_MODE_IS_INCLUDE:
 234         case IGMPV3_MODE_IS_EXCLUDE:
 235                 if (gdeleted || sdeleted)
 236                         return 0;
 237                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 238                         if (pmc->sfmode == MCAST_INCLUDE)
 239                                 return 1;
 240                         /* don't include if this source is excluded
 241                          * in all filters
 242                          */
 243                         if (psf->sf_count[MCAST_INCLUDE])
 244                                 return type == IGMPV3_MODE_IS_INCLUDE;
 245                         return pmc->sfcount[MCAST_EXCLUDE] ==
 246                                 psf->sf_count[MCAST_EXCLUDE];
 247                 }
 248                 return 0;
 249         case IGMPV3_CHANGE_TO_INCLUDE:
 250                 if (gdeleted || sdeleted)
 251                         return 0;
 252                 return psf->sf_count[MCAST_INCLUDE] != 0;
 253         case IGMPV3_CHANGE_TO_EXCLUDE:
 254                 if (gdeleted || sdeleted)
 255                         return 0;
 256                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 257                     psf->sf_count[MCAST_INCLUDE])
 258                         return 0;
 259                 return pmc->sfcount[MCAST_EXCLUDE] ==
 260                         psf->sf_count[MCAST_EXCLUDE];
 261         case IGMPV3_ALLOW_NEW_SOURCES:
 262                 if (gdeleted || !psf->sf_crcount)
 263                         return 0;
 264                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 265         case IGMPV3_BLOCK_OLD_SOURCES:
 266                 if (pmc->sfmode == MCAST_INCLUDE)
 267                         return gdeleted || (psf->sf_crcount && sdeleted);
 268                 return psf->sf_crcount && !gdeleted && !sdeleted;
 269         }
 270         return 0;
 271 }
 272
 273 static int
 274 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 275 {
 276         struct ip_sf_list *psf;
 277         int scount = 0;
 278
 279         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 280                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 281                         continue;
 282                 scount++;
 283         }
 284         return scount;
 285 }
 286
 287 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 288 {
 289         struct sk_buff *skb;
 290         struct rtable *rt;
 291         struct iphdr *pip;
 292         struct igmpv3_report *pig;
 293         struct net *net = dev_net(dev);
 294
 295         skb = alloc_skb(size + LL_ALLOCATED_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(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_set(skb, &rt->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->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         struct net *net = dev_net(dev);
 635         __be32  group = pmc ? pmc->multiaddr : 0;
 636         __be32  dst;
 637
 638         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 639                 return igmpv3_send_report(in_dev, pmc);
 640         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 641                 dst = IGMP_ALL_ROUTER;
 642         else
 643                 dst = group;
 644
 645         {
 646                 struct flowi fl = { .oif = dev->ifindex,
 647                                     .nl_u = { .ip4_u = { .daddr = dst } },
 648                                     .proto = IPPROTO_IGMP };
 649                 if (ip_route_output_key(net, &rt, &fl))
 650                         return -1;
 651         }
 652         if (rt->rt_src == 0) {
 653                 ip_rt_put(rt);
 654                 return -1;
 655         }
 656
 657         skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 658         if (skb == NULL) {
 659                 ip_rt_put(rt);
 660                 return -1;
 661         }
 662
 663         skb_dst_set(skb, &rt->dst);
 664
 665         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 666
 667         skb_reset_network_header(skb);
 668         iph = ip_hdr(skb);
 669         skb_put(skb, sizeof(struct iphdr) + 4);
 670
 671         iph->version  = 4;
 672         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 673         iph->tos      = 0xc0;
 674         iph->frag_off = htons(IP_DF);
 675         iph->ttl      = 1;
 676         iph->daddr    = dst;
 677         iph->saddr    = rt->rt_src;
 678         iph->protocol = IPPROTO_IGMP;
 679         ip_select_ident(iph, &rt->dst, NULL);
 680         ((u8*)&iph[1])[0] = IPOPT_RA;
 681         ((u8*)&iph[1])[1] = 4;
 682         ((u8*)&iph[1])[2] = 0;
 683         ((u8*)&iph[1])[3] = 0;
 684
 685         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 686         ih->type = type;
 687         ih->code = 0;
 688         ih->csum = 0;
 689         ih->group = group;
 690         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 691
 692         return ip_local_out(skb);
 693 }
 694
 695 static void igmp_gq_timer_expire(unsigned long data)
 696 {
 697         struct in_device *in_dev = (struct in_device *)data;
 698
 699         in_dev->mr_gq_running = 0;
 700         igmpv3_send_report(in_dev, NULL);
 701         __in_dev_put(in_dev);
 702 }
 703
 704 static void igmp_ifc_timer_expire(unsigned long data)
 705 {
 706         struct in_device *in_dev = (struct in_device *)data;
 707
 708         igmpv3_send_cr(in_dev);
 709         if (in_dev->mr_ifc_count) {
 710                 in_dev->mr_ifc_count--;
 711                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 712         }
 713         __in_dev_put(in_dev);
 714 }
 715
 716 static void igmp_ifc_event(struct in_device *in_dev)
 717 {
 718         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 719                 return;
 720         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 721                 IGMP_Unsolicited_Report_Count;
 722         igmp_ifc_start_timer(in_dev, 1);
 723 }
 724
 725
 726 static void igmp_timer_expire(unsigned long data)
 727 {
 728         struct ip_mc_list *im=(struct ip_mc_list *)data;
 729         struct in_device *in_dev = im->interface;
 730
 731         spin_lock(&im->lock);
 732         im->tm_running = 0;
 733
 734         if (im->unsolicit_count) {
 735                 im->unsolicit_count--;
 736                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 737         }
 738         im->reporter = 1;
 739         spin_unlock(&im->lock);
 740
 741         if (IGMP_V1_SEEN(in_dev))
 742                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 743         else if (IGMP_V2_SEEN(in_dev))
 744                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 745         else
 746                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 747
 748         ip_ma_put(im);
 749 }
 750
 751 /* mark EXCLUDE-mode sources */
 752 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 753 {
 754         struct ip_sf_list *psf;
 755         int i, scount;
 756
 757         scount = 0;
 758         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 759                 if (scount == nsrcs)
 760                         break;
 761                 for (i=0; i<nsrcs; i++) {
 762                         /* skip inactive filters */
 763                         if (pmc->sfcount[MCAST_INCLUDE] ||
 764                             pmc->sfcount[MCAST_EXCLUDE] !=
 765                             psf->sf_count[MCAST_EXCLUDE])
 766                                 continue;
 767                         if (srcs[i] == psf->sf_inaddr) {
 768                                 scount++;
 769                                 break;
 770                         }
 771                 }
 772         }
 773         pmc->gsquery = 0;
 774         if (scount == nsrcs)    /* all sources excluded */
 775                 return 0;
 776         return 1;
 777 }
 778
 779 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 780 {
 781         struct ip_sf_list *psf;
 782         int i, scount;
 783
 784         if (pmc->sfmode == MCAST_EXCLUDE)
 785                 return igmp_xmarksources(pmc, nsrcs, srcs);
 786
 787         /* mark INCLUDE-mode sources */
 788         scount = 0;
 789         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 790                 if (scount == nsrcs)
 791                         break;
 792                 for (i=0; i<nsrcs; i++)
 793                         if (srcs[i] == psf->sf_inaddr) {
 794                                 psf->sf_gsresp = 1;
 795                                 scount++;
 796                                 break;
 797                         }
 798         }
 799         if (!scount) {
 800                 pmc->gsquery = 0;
 801                 return 0;
 802         }
 803         pmc->gsquery = 1;
 804         return 1;
 805 }
 806
 807 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 808 {
 809         struct ip_mc_list *im;
 810
 811         /* Timers are only set for non-local groups */
 812
 813         if (group == IGMP_ALL_HOSTS)
 814                 return;
 815
 816         read_lock(&in_dev->mc_list_lock);
 817         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 818                 if (im->multiaddr == group) {
 819                         igmp_stop_timer(im);
 820                         break;
 821                 }
 822         }
 823         read_unlock(&in_dev->mc_list_lock);
 824 }
 825
 826 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 827         int len)
 828 {
 829         struct igmphdr          *ih = igmp_hdr(skb);
 830         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 831         struct ip_mc_list       *im;
 832         __be32                  group = ih->group;
 833         int                     max_delay;
 834         int                     mark = 0;
 835
 836
 837         if (len == 8 || IGMP_V2_SEEN(in_dev)) {
 838                 if (ih->code == 0) {
 839                         /* Alas, old v1 router presents here. */
 840
 841                         max_delay = IGMP_Query_Response_Interval;
 842                         in_dev->mr_v1_seen = jiffies +
 843                                 IGMP_V1_Router_Present_Timeout;
 844                         group = 0;
 845                 } else {
 846                         /* v2 router present */
 847                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 848                         in_dev->mr_v2_seen = jiffies +
 849                                 IGMP_V2_Router_Present_Timeout;
 850                 }
 851                 /* cancel the interface change timer */
 852                 in_dev->mr_ifc_count = 0;
 853                 if (del_timer(&in_dev->mr_ifc_timer))
 854                         __in_dev_put(in_dev);
 855                 /* clear deleted report items */
 856                 igmpv3_clear_delrec(in_dev);
 857         } else if (len < 12) {
 858                 return; /* ignore bogus packet; freed by caller */
 859         } else { /* v3 */
 860                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 861                         return;
 862
 863                 ih3 = igmpv3_query_hdr(skb);
 864                 if (ih3->nsrcs) {
 865                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 866                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 867                                 return;
 868                         ih3 = igmpv3_query_hdr(skb);
 869                 }
 870
 871                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 872                 if (!max_delay)
 873                         max_delay = 1;  /* can't mod w/ 0 */
 874                 in_dev->mr_maxdelay = max_delay;
 875                 if (ih3->qrv)
 876                         in_dev->mr_qrv = ih3->qrv;
 877                 if (!group) { /* general query */
 878                         if (ih3->nsrcs)
 879                                 return; /* no sources allowed */
 880                         igmp_gq_start_timer(in_dev);
 881                         return;
 882                 }
 883                 /* mark sources to include, if group & source-specific */
 884                 mark = ih3->nsrcs != 0;
 885         }
 886
 887         /*
 888          * - Start the timers in all of our membership records
 889          *   that the query applies to for the interface on
 890          *   which the query arrived excl. those that belong
 891          *   to a "local" group (224.0.0.X)
 892          * - For timers already running check if they need to
 893          *   be reset.
 894          * - Use the igmp->igmp_code field as the maximum
 895          *   delay possible
 896          */
 897         read_lock(&in_dev->mc_list_lock);
 898         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 899                 int changed;
 900
 901                 if (group && group != im->multiaddr)
 902                         continue;
 903                 if (im->multiaddr == IGMP_ALL_HOSTS)
 904                         continue;
 905                 spin_lock_bh(&im->lock);
 906                 if (im->tm_running)
 907                         im->gsquery = im->gsquery && mark;
 908                 else
 909                         im->gsquery = mark;
 910                 changed = !im->gsquery ||
 911                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 912                 spin_unlock_bh(&im->lock);
 913                 if (changed)
 914                         igmp_mod_timer(im, max_delay);
 915         }
 916         read_unlock(&in_dev->mc_list_lock);
 917 }
 918
 919 /* called in rcu_read_lock() section */
 920 int igmp_rcv(struct sk_buff *skb)
 921 {
 922         /* This basically follows the spec line by line -- see RFC1112 */
 923         struct igmphdr *ih;
 924         struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
 925         int len = skb->len;
 926
 927         if (in_dev == NULL)
 928                 goto drop;
 929
 930         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 931                 goto drop;
 932
 933         switch (skb->ip_summed) {
 934         case CHECKSUM_COMPLETE:
 935                 if (!csum_fold(skb->csum))
 936                         break;
 937                 /* fall through */
 938         case CHECKSUM_NONE:
 939                 skb->csum = 0;
 940                 if (__skb_checksum_complete(skb))
 941                         goto drop;
 942         }
 943
 944         ih = igmp_hdr(skb);
 945         switch (ih->type) {
 946         case IGMP_HOST_MEMBERSHIP_QUERY:
 947                 igmp_heard_query(in_dev, skb, len);
 948                 break;
 949         case IGMP_HOST_MEMBERSHIP_REPORT:
 950         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 951                 /* Is it our report looped back? */
 952                 if (skb_rtable(skb)->fl.iif == 0)
 953                         break;
 954                 /* don't rely on MC router hearing unicast reports */
 955                 if (skb->pkt_type == PACKET_MULTICAST ||
 956                     skb->pkt_type == PACKET_BROADCAST)
 957                         igmp_heard_report(in_dev, ih->group);
 958                 break;
 959         case IGMP_PIM:
 960 #ifdef CONFIG_IP_PIMSM_V1
 961                 return pim_rcv_v1(skb);
 962 #endif
 963         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 964         case IGMP_DVMRP:
 965         case IGMP_TRACE:
 966         case IGMP_HOST_LEAVE_MESSAGE:
 967         case IGMP_MTRACE:
 968         case IGMP_MTRACE_RESP:
 969                 break;
 970         default:
 971                 break;
 972         }
 973
 974 drop:
 975         kfree_skb(skb);
 976         return 0;
 977 }
 978
 979 #endif
 980
 981
 982 /*
 983  *      Add a filter to a device
 984  */
 985
 986 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 987 {
 988         char buf[MAX_ADDR_LEN];
 989         struct net_device *dev = in_dev->dev;
 990
 991         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 992            We will get multicast token leakage, when IFF_MULTICAST
 993            is changed. This check should be done in dev->set_multicast_list
 994            routine. Something sort of:
 995            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 996            --ANK
 997            */
 998         if (arp_mc_map(addr, buf, dev, 0) == 0)
 999                 dev_mc_add(dev, buf);
1000 }
1001
1002 /*
1003  *      Remove a filter from a device
1004  */
1005
1006 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1007 {
1008         char buf[MAX_ADDR_LEN];
1009         struct net_device *dev = in_dev->dev;
1010
1011         if (arp_mc_map(addr, buf, dev, 0) == 0)
1012                 dev_mc_del(dev, buf);
1013 }
1014
1015 #ifdef CONFIG_IP_MULTICAST
1016 /*
1017  * deleted ip_mc_list manipulation
1018  */
1019 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1020 {
1021         struct ip_mc_list *pmc;
1022
1023         /* this is an "ip_mc_list" for convenience; only the fields below
1024          * are actually used. In particular, the refcnt and users are not
1025          * used for management of the delete list. Using the same structure
1026          * for deleted items allows change reports to use common code with
1027          * non-deleted or query-response MCA's.
1028          */
1029         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1030         if (!pmc)
1031                 return;
1032         spin_lock_bh(&im->lock);
1033         pmc->interface = im->interface;
1034         in_dev_hold(in_dev);
1035         pmc->multiaddr = im->multiaddr;
1036         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1037                 IGMP_Unsolicited_Report_Count;
1038         pmc->sfmode = im->sfmode;
1039         if (pmc->sfmode == MCAST_INCLUDE) {
1040                 struct ip_sf_list *psf;
1041
1042                 pmc->tomb = im->tomb;
1043                 pmc->sources = im->sources;
1044                 im->tomb = im->sources = NULL;
1045                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1046                         psf->sf_crcount = pmc->crcount;
1047         }
1048         spin_unlock_bh(&im->lock);
1049
1050         spin_lock_bh(&in_dev->mc_tomb_lock);
1051         pmc->next = in_dev->mc_tomb;
1052         in_dev->mc_tomb = pmc;
1053         spin_unlock_bh(&in_dev->mc_tomb_lock);
1054 }
1055
1056 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1057 {
1058         struct ip_mc_list *pmc, *pmc_prev;
1059         struct ip_sf_list *psf, *psf_next;
1060
1061         spin_lock_bh(&in_dev->mc_tomb_lock);
1062         pmc_prev = NULL;
1063         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1064                 if (pmc->multiaddr == multiaddr)
1065                         break;
1066                 pmc_prev = pmc;
1067         }
1068         if (pmc) {
1069                 if (pmc_prev)
1070                         pmc_prev->next = pmc->next;
1071                 else
1072                         in_dev->mc_tomb = pmc->next;
1073         }
1074         spin_unlock_bh(&in_dev->mc_tomb_lock);
1075         if (pmc) {
1076                 for (psf=pmc->tomb; psf; psf=psf_next) {
1077                         psf_next = psf->sf_next;
1078                         kfree(psf);
1079                 }
1080                 in_dev_put(pmc->interface);
1081                 kfree(pmc);
1082         }
1083 }
1084
1085 static void igmpv3_clear_delrec(struct in_device *in_dev)
1086 {
1087         struct ip_mc_list *pmc, *nextpmc;
1088
1089         spin_lock_bh(&in_dev->mc_tomb_lock);
1090         pmc = in_dev->mc_tomb;
1091         in_dev->mc_tomb = NULL;
1092         spin_unlock_bh(&in_dev->mc_tomb_lock);
1093
1094         for (; pmc; pmc = nextpmc) {
1095                 nextpmc = pmc->next;
1096                 ip_mc_clear_src(pmc);
1097                 in_dev_put(pmc->interface);
1098                 kfree(pmc);
1099         }
1100         /* clear dead sources, too */
1101         read_lock(&in_dev->mc_list_lock);
1102         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1103                 struct ip_sf_list *psf, *psf_next;
1104
1105                 spin_lock_bh(&pmc->lock);
1106                 psf = pmc->tomb;
1107                 pmc->tomb = NULL;
1108                 spin_unlock_bh(&pmc->lock);
1109                 for (; psf; psf=psf_next) {
1110                         psf_next = psf->sf_next;
1111                         kfree(psf);
1112                 }
1113         }
1114         read_unlock(&in_dev->mc_list_lock);
1115 }
1116 #endif
1117
1118 static void igmp_group_dropped(struct ip_mc_list *im)
1119 {
1120         struct in_device *in_dev = im->interface;
1121 #ifdef CONFIG_IP_MULTICAST
1122         int reporter;
1123 #endif
1124
1125         if (im->loaded) {
1126                 im->loaded = 0;
1127                 ip_mc_filter_del(in_dev, im->multiaddr);
1128         }
1129
1130 #ifdef CONFIG_IP_MULTICAST
1131         if (im->multiaddr == IGMP_ALL_HOSTS)
1132                 return;
1133
1134         reporter = im->reporter;
1135         igmp_stop_timer(im);
1136
1137         if (!in_dev->dead) {
1138                 if (IGMP_V1_SEEN(in_dev))
1139                         goto done;
1140                 if (IGMP_V2_SEEN(in_dev)) {
1141                         if (reporter)
1142                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1143                         goto done;
1144                 }
1145                 /* IGMPv3 */
1146                 igmpv3_add_delrec(in_dev, im);
1147
1148                 igmp_ifc_event(in_dev);
1149         }
1150 done:
1151 #endif
1152         ip_mc_clear_src(im);
1153 }
1154
1155 static void igmp_group_added(struct ip_mc_list *im)
1156 {
1157         struct in_device *in_dev = im->interface;
1158
1159         if (im->loaded == 0) {
1160                 im->loaded = 1;
1161                 ip_mc_filter_add(in_dev, im->multiaddr);
1162         }
1163
1164 #ifdef CONFIG_IP_MULTICAST
1165         if (im->multiaddr == IGMP_ALL_HOSTS)
1166                 return;
1167
1168         if (in_dev->dead)
1169                 return;
1170         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1171                 spin_lock_bh(&im->lock);
1172                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1173                 spin_unlock_bh(&im->lock);
1174                 return;
1175         }
1176         /* else, v3 */
1177
1178         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1179                 IGMP_Unsolicited_Report_Count;
1180         igmp_ifc_event(in_dev);
1181 #endif
1182 }
1183
1184
1185 /*
1186  *      Multicast list managers
1187  */
1188
1189
1190 /*
1191  *      A socket has joined a multicast group on device dev.
1192  */
1193
1194 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1195 {
1196         struct ip_mc_list *im;
1197
1198         ASSERT_RTNL();
1199
1200         for (im=in_dev->mc_list; im; im=im->next) {
1201                 if (im->multiaddr == addr) {
1202                         im->users++;
1203                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1204                         goto out;
1205                 }
1206         }
1207
1208         im = kmalloc(sizeof(*im), GFP_KERNEL);
1209         if (!im)
1210                 goto out;
1211
1212         im->users = 1;
1213         im->interface = in_dev;
1214         in_dev_hold(in_dev);
1215         im->multiaddr = addr;
1216         /* initial mode is (EX, empty) */
1217         im->sfmode = MCAST_EXCLUDE;
1218         im->sfcount[MCAST_INCLUDE] = 0;
1219         im->sfcount[MCAST_EXCLUDE] = 1;
1220         im->sources = NULL;
1221         im->tomb = NULL;
1222         im->crcount = 0;
1223         atomic_set(&im->refcnt, 1);
1224         spin_lock_init(&im->lock);
1225 #ifdef CONFIG_IP_MULTICAST
1226         im->tm_running = 0;
1227         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1228         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1229         im->reporter = 0;
1230         im->gsquery = 0;
1231 #endif
1232         im->loaded = 0;
1233         write_lock_bh(&in_dev->mc_list_lock);
1234         im->next = in_dev->mc_list;
1235         in_dev->mc_list = im;
1236         in_dev->mc_count++;
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 EXPORT_SYMBOL(ip_mc_inc_group);
1248
1249 /*
1250  *      Resend IGMP JOIN report; used for bonding.
1251  */
1252 void ip_mc_rejoin_group(struct ip_mc_list *im)
1253 {
1254 #ifdef CONFIG_IP_MULTICAST
1255         struct in_device *in_dev = im->interface;
1256
1257         if (im->multiaddr == IGMP_ALL_HOSTS)
1258                 return;
1259
1260         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1261                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1262                 return;
1263         }
1264         /* else, v3 */
1265         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1266                 IGMP_Unsolicited_Report_Count;
1267         igmp_ifc_event(in_dev);
1268 #endif
1269 }
1270 EXPORT_SYMBOL(ip_mc_rejoin_group);
1271
1272 /*
1273  *      A socket has left a multicast group on device dev
1274  */
1275
1276 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1277 {
1278         struct ip_mc_list *i, **ip;
1279
1280         ASSERT_RTNL();
1281
1282         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1283                 if (i->multiaddr == addr) {
1284                         if (--i->users == 0) {
1285                                 write_lock_bh(&in_dev->mc_list_lock);
1286                                 *ip = i->next;
1287                                 in_dev->mc_count--;
1288                                 write_unlock_bh(&in_dev->mc_list_lock);
1289                                 igmp_group_dropped(i);
1290
1291                                 if (!in_dev->dead)
1292                                         ip_rt_multicast_event(in_dev);
1293
1294                                 ip_ma_put(i);
1295                                 return;
1296                         }
1297                         break;
1298                 }
1299         }
1300 }
1301 EXPORT_SYMBOL(ip_mc_dec_group);
1302
1303 /* Device changing type */
1304
1305 void ip_mc_unmap(struct in_device *in_dev)
1306 {
1307         struct ip_mc_list *i;
1308
1309         ASSERT_RTNL();
1310
1311         for (i = in_dev->mc_list; i; i = i->next)
1312                 igmp_group_dropped(i);
1313 }
1314
1315 void ip_mc_remap(struct in_device *in_dev)
1316 {
1317         struct ip_mc_list *i;
1318
1319         ASSERT_RTNL();
1320
1321         for (i = in_dev->mc_list; i; i = i->next)
1322                 igmp_group_added(i);
1323 }
1324
1325 /* Device going down */
1326
1327 void ip_mc_down(struct in_device *in_dev)
1328 {
1329         struct ip_mc_list *i;
1330
1331         ASSERT_RTNL();
1332
1333         for (i=in_dev->mc_list; i; i=i->next)
1334                 igmp_group_dropped(i);
1335
1336 #ifdef CONFIG_IP_MULTICAST
1337         in_dev->mr_ifc_count = 0;
1338         if (del_timer(&in_dev->mr_ifc_timer))
1339                 __in_dev_put(in_dev);
1340         in_dev->mr_gq_running = 0;
1341         if (del_timer(&in_dev->mr_gq_timer))
1342                 __in_dev_put(in_dev);
1343         igmpv3_clear_delrec(in_dev);
1344 #endif
1345
1346         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1347 }
1348
1349 void ip_mc_init_dev(struct in_device *in_dev)
1350 {
1351         ASSERT_RTNL();
1352
1353         in_dev->mc_tomb = NULL;
1354 #ifdef CONFIG_IP_MULTICAST
1355         in_dev->mr_gq_running = 0;
1356         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1357                         (unsigned long)in_dev);
1358         in_dev->mr_ifc_count = 0;
1359         in_dev->mc_count     = 0;
1360         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1361                         (unsigned long)in_dev);
1362         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1363 #endif
1364
1365         rwlock_init(&in_dev->mc_list_lock);
1366         spin_lock_init(&in_dev->mc_tomb_lock);
1367 }
1368
1369 /* Device going up */
1370
1371 void ip_mc_up(struct in_device *in_dev)
1372 {
1373         struct ip_mc_list *i;
1374
1375         ASSERT_RTNL();
1376
1377         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1378
1379         for (i=in_dev->mc_list; i; i=i->next)
1380                 igmp_group_added(i);
1381 }
1382
1383 /*
1384  *      Device is about to be destroyed: clean up.
1385  */
1386
1387 void ip_mc_destroy_dev(struct in_device *in_dev)
1388 {
1389         struct ip_mc_list *i;
1390
1391         ASSERT_RTNL();
1392
1393         /* Deactivate timers */
1394         ip_mc_down(in_dev);
1395
1396         write_lock_bh(&in_dev->mc_list_lock);
1397         while ((i = in_dev->mc_list) != NULL) {
1398                 in_dev->mc_list = i->next;
1399                 in_dev->mc_count--;
1400                 write_unlock_bh(&in_dev->mc_list_lock);
1401                 igmp_group_dropped(i);
1402                 ip_ma_put(i);
1403
1404                 write_lock_bh(&in_dev->mc_list_lock);
1405         }
1406         write_unlock_bh(&in_dev->mc_list_lock);
1407 }
1408
1409 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1410 {
1411         struct flowi fl = { .nl_u = { .ip4_u =
1412                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1413         struct rtable *rt;
1414         struct net_device *dev = NULL;
1415         struct in_device *idev = NULL;
1416
1417         if (imr->imr_ifindex) {
1418                 idev = inetdev_by_index(net, imr->imr_ifindex);
1419                 if (idev)
1420                         __in_dev_put(idev);
1421                 return idev;
1422         }
1423         if (imr->imr_address.s_addr) {
1424                 dev = ip_dev_find(net, imr->imr_address.s_addr);
1425                 if (!dev)
1426                         return NULL;
1427                 dev_put(dev);
1428         }
1429
1430         if (!dev && !ip_route_output_key(net, &rt, &fl)) {
1431                 dev = rt->dst.dev;
1432                 ip_rt_put(rt);
1433         }
1434         if (dev) {
1435                 imr->imr_ifindex = dev->ifindex;
1436                 idev = __in_dev_get_rtnl(dev);
1437         }
1438         return idev;
1439 }
1440
1441 /*
1442  *      Join a socket to a group
1443  */
1444 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1445 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1446
1447
1448 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1449         __be32 *psfsrc)
1450 {
1451         struct ip_sf_list *psf, *psf_prev;
1452         int rv = 0;
1453
1454         psf_prev = NULL;
1455         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1456                 if (psf->sf_inaddr == *psfsrc)
1457                         break;
1458                 psf_prev = psf;
1459         }
1460         if (!psf || psf->sf_count[sfmode] == 0) {
1461                 /* source filter not found, or count wrong =>  bug */
1462                 return -ESRCH;
1463         }
1464         psf->sf_count[sfmode]--;
1465         if (psf->sf_count[sfmode] == 0) {
1466                 ip_rt_multicast_event(pmc->interface);
1467         }
1468         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1469 #ifdef CONFIG_IP_MULTICAST
1470                 struct in_device *in_dev = pmc->interface;
1471 #endif
1472
1473                 /* no more filters for this source */
1474                 if (psf_prev)
1475                         psf_prev->sf_next = psf->sf_next;
1476                 else
1477                         pmc->sources = psf->sf_next;
1478 #ifdef CONFIG_IP_MULTICAST
1479                 if (psf->sf_oldin &&
1480                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1481                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1482                                 IGMP_Unsolicited_Report_Count;
1483                         psf->sf_next = pmc->tomb;
1484                         pmc->tomb = psf;
1485                         rv = 1;
1486                 } else
1487 #endif
1488                         kfree(psf);
1489         }
1490         return rv;
1491 }
1492
1493 #ifndef CONFIG_IP_MULTICAST
1494 #define igmp_ifc_event(x)       do { } while (0)
1495 #endif
1496
1497 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1498                          int sfcount, __be32 *psfsrc, int delta)
1499 {
1500         struct ip_mc_list *pmc;
1501         int     changerec = 0;
1502         int     i, err;
1503
1504         if (!in_dev)
1505                 return -ENODEV;
1506         read_lock(&in_dev->mc_list_lock);
1507         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1508                 if (*pmca == pmc->multiaddr)
1509                         break;
1510         }
1511         if (!pmc) {
1512                 /* MCA not found?? bug */
1513                 read_unlock(&in_dev->mc_list_lock);
1514                 return -ESRCH;
1515         }
1516         spin_lock_bh(&pmc->lock);
1517         read_unlock(&in_dev->mc_list_lock);
1518 #ifdef CONFIG_IP_MULTICAST
1519         sf_markstate(pmc);
1520 #endif
1521         if (!delta) {
1522                 err = -EINVAL;
1523                 if (!pmc->sfcount[sfmode])
1524                         goto out_unlock;
1525                 pmc->sfcount[sfmode]--;
1526         }
1527         err = 0;
1528         for (i=0; i<sfcount; i++) {
1529                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1530
1531                 changerec |= rv > 0;
1532                 if (!err && rv < 0)
1533                         err = rv;
1534         }
1535         if (pmc->sfmode == MCAST_EXCLUDE &&
1536             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1537             pmc->sfcount[MCAST_INCLUDE]) {
1538 #ifdef CONFIG_IP_MULTICAST
1539                 struct ip_sf_list *psf;
1540 #endif
1541
1542                 /* filter mode change */
1543                 pmc->sfmode = MCAST_INCLUDE;
1544 #ifdef CONFIG_IP_MULTICAST
1545                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1546                         IGMP_Unsolicited_Report_Count;
1547                 in_dev->mr_ifc_count = pmc->crcount;
1548                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1549                         psf->sf_crcount = 0;
1550                 igmp_ifc_event(pmc->interface);
1551         } else if (sf_setstate(pmc) || changerec) {
1552                 igmp_ifc_event(pmc->interface);
1553 #endif
1554         }
1555 out_unlock:
1556         spin_unlock_bh(&pmc->lock);
1557         return err;
1558 }
1559
1560 /*
1561  * Add multicast single-source filter to the interface list
1562  */
1563 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1564         __be32 *psfsrc, int delta)
1565 {
1566         struct ip_sf_list *psf, *psf_prev;
1567
1568         psf_prev = NULL;
1569         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1570                 if (psf->sf_inaddr == *psfsrc)
1571                         break;
1572                 psf_prev = psf;
1573         }
1574         if (!psf) {
1575                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1576                 if (!psf)
1577                         return -ENOBUFS;
1578                 psf->sf_inaddr = *psfsrc;
1579                 if (psf_prev) {
1580                         psf_prev->sf_next = psf;
1581                 } else
1582                         pmc->sources = psf;
1583         }
1584         psf->sf_count[sfmode]++;
1585         if (psf->sf_count[sfmode] == 1) {
1586                 ip_rt_multicast_event(pmc->interface);
1587         }
1588         return 0;
1589 }
1590
1591 #ifdef CONFIG_IP_MULTICAST
1592 static void sf_markstate(struct ip_mc_list *pmc)
1593 {
1594         struct ip_sf_list *psf;
1595         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1596
1597         for (psf=pmc->sources; psf; psf=psf->sf_next)
1598                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1599                         psf->sf_oldin = mca_xcount ==
1600                                 psf->sf_count[MCAST_EXCLUDE] &&
1601                                 !psf->sf_count[MCAST_INCLUDE];
1602                 } else
1603                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1604 }
1605
1606 static int sf_setstate(struct ip_mc_list *pmc)
1607 {
1608         struct ip_sf_list *psf, *dpsf;
1609         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1610         int qrv = pmc->interface->mr_qrv;
1611         int new_in, rv;
1612
1613         rv = 0;
1614         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1615                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1616                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1617                                 !psf->sf_count[MCAST_INCLUDE];
1618                 } else
1619                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1620                 if (new_in) {
1621                         if (!psf->sf_oldin) {
1622                                 struct ip_sf_list *prev = NULL;
1623
1624                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1625                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1626                                                 break;
1627                                         prev = dpsf;
1628                                 }
1629                                 if (dpsf) {
1630                                         if (prev)
1631                                                 prev->sf_next = dpsf->sf_next;
1632                                         else
1633                                                 pmc->tomb = dpsf->sf_next;
1634                                         kfree(dpsf);
1635                                 }
1636                                 psf->sf_crcount = qrv;
1637                                 rv++;
1638                         }
1639                 } else if (psf->sf_oldin) {
1640
1641                         psf->sf_crcount = 0;
1642                         /*
1643                          * add or update "delete" records if an active filter
1644                          * is now inactive
1645                          */
1646                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1647                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1648                                         break;
1649                         if (!dpsf) {
1650                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1651                                 if (!dpsf)
1652                                         continue;
1653                                 *dpsf = *psf;
1654                                 /* pmc->lock held by callers */
1655                                 dpsf->sf_next = pmc->tomb;
1656                                 pmc->tomb = dpsf;
1657                         }
1658                         dpsf->sf_crcount = qrv;
1659                         rv++;
1660                 }
1661         }
1662         return rv;
1663 }
1664 #endif
1665
1666 /*
1667  * Add multicast source filter list to the interface list
1668  */
1669 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1670                          int sfcount, __be32 *psfsrc, int delta)
1671 {
1672         struct ip_mc_list *pmc;
1673         int     isexclude;
1674         int     i, err;
1675
1676         if (!in_dev)
1677                 return -ENODEV;
1678         read_lock(&in_dev->mc_list_lock);
1679         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1680                 if (*pmca == pmc->multiaddr)
1681                         break;
1682         }
1683         if (!pmc) {
1684                 /* MCA not found?? bug */
1685                 read_unlock(&in_dev->mc_list_lock);
1686                 return -ESRCH;
1687         }
1688         spin_lock_bh(&pmc->lock);
1689         read_unlock(&in_dev->mc_list_lock);
1690
1691 #ifdef CONFIG_IP_MULTICAST
1692         sf_markstate(pmc);
1693 #endif
1694         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1695         if (!delta)
1696                 pmc->sfcount[sfmode]++;
1697         err = 0;
1698         for (i=0; i<sfcount; i++) {
1699                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1700                 if (err)
1701                         break;
1702         }
1703         if (err) {
1704                 int j;
1705
1706                 pmc->sfcount[sfmode]--;
1707                 for (j=0; j<i; j++)
1708                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1709         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1710 #ifdef CONFIG_IP_MULTICAST
1711                 struct ip_sf_list *psf;
1712                 in_dev = pmc->interface;
1713 #endif
1714
1715                 /* filter mode change */
1716                 if (pmc->sfcount[MCAST_EXCLUDE])
1717                         pmc->sfmode = MCAST_EXCLUDE;
1718                 else if (pmc->sfcount[MCAST_INCLUDE])
1719                         pmc->sfmode = MCAST_INCLUDE;
1720 #ifdef CONFIG_IP_MULTICAST
1721                 /* else no filters; keep old mode for reports */
1722
1723                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1724                         IGMP_Unsolicited_Report_Count;
1725                 in_dev->mr_ifc_count = pmc->crcount;
1726                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1727                         psf->sf_crcount = 0;
1728                 igmp_ifc_event(in_dev);
1729         } else if (sf_setstate(pmc)) {
1730                 igmp_ifc_event(in_dev);
1731 #endif
1732         }
1733         spin_unlock_bh(&pmc->lock);
1734         return err;
1735 }
1736
1737 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1738 {
1739         struct ip_sf_list *psf, *nextpsf;
1740
1741         for (psf=pmc->tomb; psf; psf=nextpsf) {
1742                 nextpsf = psf->sf_next;
1743                 kfree(psf);
1744         }
1745         pmc->tomb = NULL;
1746         for (psf=pmc->sources; psf; psf=nextpsf) {
1747                 nextpsf = psf->sf_next;
1748                 kfree(psf);
1749         }
1750         pmc->sources = NULL;
1751         pmc->sfmode = MCAST_EXCLUDE;
1752         pmc->sfcount[MCAST_INCLUDE] = 0;
1753         pmc->sfcount[MCAST_EXCLUDE] = 1;
1754 }
1755
1756
1757 /*
1758  * Join a multicast group
1759  */
1760 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1761 {
1762         int err;
1763         __be32 addr = imr->imr_multiaddr.s_addr;
1764         struct ip_mc_socklist *iml = NULL, *i;
1765         struct in_device *in_dev;
1766         struct inet_sock *inet = inet_sk(sk);
1767         struct net *net = sock_net(sk);
1768         int ifindex;
1769         int count = 0;
1770
1771         if (!ipv4_is_multicast(addr))
1772                 return -EINVAL;
1773
1774         rtnl_lock();
1775
1776         in_dev = ip_mc_find_dev(net, imr);
1777
1778         if (!in_dev) {
1779                 iml = NULL;
1780                 err = -ENODEV;
1781                 goto done;
1782         }
1783
1784         err = -EADDRINUSE;
1785         ifindex = imr->imr_ifindex;
1786         for (i = inet->mc_list; i; i = i->next) {
1787                 if (i->multi.imr_multiaddr.s_addr == addr &&
1788                     i->multi.imr_ifindex == ifindex)
1789                         goto done;
1790                 count++;
1791         }
1792         err = -ENOBUFS;
1793         if (count >= sysctl_igmp_max_memberships)
1794                 goto done;
1795         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1796         if (iml == NULL)
1797                 goto done;
1798
1799         memcpy(&iml->multi, imr, sizeof(*imr));
1800         iml->next = inet->mc_list;
1801         iml->sflist = NULL;
1802         iml->sfmode = MCAST_EXCLUDE;
1803         rcu_assign_pointer(inet->mc_list, iml);
1804         ip_mc_inc_group(in_dev, addr);
1805         err = 0;
1806 done:
1807         rtnl_unlock();
1808         return err;
1809 }
1810 EXPORT_SYMBOL(ip_mc_join_group);
1811
1812 static void ip_sf_socklist_reclaim(struct rcu_head *rp)
1813 {
1814         struct ip_sf_socklist *psf;
1815
1816         psf = container_of(rp, struct ip_sf_socklist, rcu);
1817         /* sk_omem_alloc should have been decreased by the caller*/
1818         kfree(psf);
1819 }
1820
1821 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1822                            struct in_device *in_dev)
1823 {
1824         struct ip_sf_socklist *psf = iml->sflist;
1825         int err;
1826
1827         if (psf == NULL) {
1828                 /* any-source empty exclude case */
1829                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1830                         iml->sfmode, 0, NULL, 0);
1831         }
1832         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1833                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1834         rcu_assign_pointer(iml->sflist, NULL);
1835         /* decrease mem now to avoid the memleak warning */
1836         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1837         call_rcu(&psf->rcu, ip_sf_socklist_reclaim);
1838         return err;
1839 }
1840
1841
1842 static void ip_mc_socklist_reclaim(struct rcu_head *rp)
1843 {
1844         struct ip_mc_socklist *iml;
1845
1846         iml = container_of(rp, struct ip_mc_socklist, rcu);
1847         /* sk_omem_alloc should have been decreased by the caller*/
1848         kfree(iml);
1849 }
1850
1851
1852 /*
1853  *      Ask a socket to leave a group.
1854  */
1855
1856 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1857 {
1858         struct inet_sock *inet = inet_sk(sk);
1859         struct ip_mc_socklist *iml, **imlp;
1860         struct in_device *in_dev;
1861         struct net *net = sock_net(sk);
1862         __be32 group = imr->imr_multiaddr.s_addr;
1863         u32 ifindex;
1864         int ret = -EADDRNOTAVAIL;
1865
1866         rtnl_lock();
1867         in_dev = ip_mc_find_dev(net, imr);
1868         ifindex = imr->imr_ifindex;
1869         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1870                 if (iml->multi.imr_multiaddr.s_addr != group)
1871                         continue;
1872                 if (ifindex) {
1873                         if (iml->multi.imr_ifindex != ifindex)
1874                                 continue;
1875                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1876                                 iml->multi.imr_address.s_addr)
1877                         continue;
1878
1879                 (void) ip_mc_leave_src(sk, iml, in_dev);
1880
1881                 rcu_assign_pointer(*imlp, iml->next);
1882
1883                 if (in_dev)
1884                         ip_mc_dec_group(in_dev, group);
1885                 rtnl_unlock();
1886                 /* decrease mem now to avoid the memleak warning */
1887                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1888                 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
1889                 return 0;
1890         }
1891         if (!in_dev)
1892                 ret = -ENODEV;
1893         rtnl_unlock();
1894         return ret;
1895 }
1896
1897 int ip_mc_source(int add, int omode, struct sock *sk, struct
1898         ip_mreq_source *mreqs, int ifindex)
1899 {
1900         int err;
1901         struct ip_mreqn imr;
1902         __be32 addr = mreqs->imr_multiaddr;
1903         struct ip_mc_socklist *pmc;
1904         struct in_device *in_dev = NULL;
1905         struct inet_sock *inet = inet_sk(sk);
1906         struct ip_sf_socklist *psl;
1907         struct net *net = sock_net(sk);
1908         int leavegroup = 0;
1909         int i, j, rv;
1910
1911         if (!ipv4_is_multicast(addr))
1912                 return -EINVAL;
1913
1914         rtnl_lock();
1915
1916         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1917         imr.imr_address.s_addr = mreqs->imr_interface;
1918         imr.imr_ifindex = ifindex;
1919         in_dev = ip_mc_find_dev(net, &imr);
1920
1921         if (!in_dev) {
1922                 err = -ENODEV;
1923                 goto done;
1924         }
1925         err = -EADDRNOTAVAIL;
1926
1927         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1928                 if ((pmc->multi.imr_multiaddr.s_addr ==
1929                      imr.imr_multiaddr.s_addr) &&
1930                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
1931                         break;
1932         }
1933         if (!pmc) {             /* must have a prior join */
1934                 err = -EINVAL;
1935                 goto done;
1936         }
1937         /* if a source filter was set, must be the same mode as before */
1938         if (pmc->sflist) {
1939                 if (pmc->sfmode != omode) {
1940                         err = -EINVAL;
1941                         goto done;
1942                 }
1943         } else if (pmc->sfmode != omode) {
1944                 /* allow mode switches for empty-set filters */
1945                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1946                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1947                         NULL, 0);
1948                 pmc->sfmode = omode;
1949         }
1950
1951         psl = pmc->sflist;
1952         if (!add) {
1953                 if (!psl)
1954                         goto done;      /* err = -EADDRNOTAVAIL */
1955                 rv = !0;
1956                 for (i=0; i<psl->sl_count; i++) {
1957                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1958                                 sizeof(__be32));
1959                         if (rv == 0)
1960                                 break;
1961                 }
1962                 if (rv)         /* source not found */
1963                         goto done;      /* err = -EADDRNOTAVAIL */
1964
1965                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1966                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1967                         leavegroup = 1;
1968                         goto done;
1969                 }
1970
1971                 /* update the interface filter */
1972                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1973                         &mreqs->imr_sourceaddr, 1);
1974
1975                 for (j=i+1; j<psl->sl_count; j++)
1976                         psl->sl_addr[j-1] = psl->sl_addr[j];
1977                 psl->sl_count--;
1978                 err = 0;
1979                 goto done;
1980         }
1981         /* else, add a new source to the filter */
1982
1983         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1984                 err = -ENOBUFS;
1985                 goto done;
1986         }
1987         if (!psl || psl->sl_count == psl->sl_max) {
1988                 struct ip_sf_socklist *newpsl;
1989                 int count = IP_SFBLOCK;
1990
1991                 if (psl)
1992                         count += psl->sl_max;
1993                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1994                 if (!newpsl) {
1995                         err = -ENOBUFS;
1996                         goto done;
1997                 }
1998                 newpsl->sl_max = count;
1999                 newpsl->sl_count = count - IP_SFBLOCK;
2000                 if (psl) {
2001                         for (i=0; i<psl->sl_count; i++)
2002                                 newpsl->sl_addr[i] = psl->sl_addr[i];
2003                         /* decrease mem now to avoid the memleak warning */
2004                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2005                         call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2006                 }
2007                 rcu_assign_pointer(pmc->sflist, newpsl);
2008                 psl = newpsl;
2009         }
2010         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2011         for (i=0; i<psl->sl_count; i++) {
2012                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2013                         sizeof(__be32));
2014                 if (rv == 0)
2015                         break;
2016         }
2017         if (rv == 0)            /* address already there is an error */
2018                 goto done;
2019         for (j=psl->sl_count-1; j>=i; j--)
2020                 psl->sl_addr[j+1] = psl->sl_addr[j];
2021         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2022         psl->sl_count++;
2023         err = 0;
2024         /* update the interface list */
2025         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2026                 &mreqs->imr_sourceaddr, 1);
2027 done:
2028         rtnl_unlock();
2029         if (leavegroup)
2030                 return ip_mc_leave_group(sk, &imr);
2031         return err;
2032 }
2033
2034 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2035 {
2036         int err = 0;
2037         struct ip_mreqn imr;
2038         __be32 addr = msf->imsf_multiaddr;
2039         struct ip_mc_socklist *pmc;
2040         struct in_device *in_dev;
2041         struct inet_sock *inet = inet_sk(sk);
2042         struct ip_sf_socklist *newpsl, *psl;
2043         struct net *net = sock_net(sk);
2044         int leavegroup = 0;
2045
2046         if (!ipv4_is_multicast(addr))
2047                 return -EINVAL;
2048         if (msf->imsf_fmode != MCAST_INCLUDE &&
2049             msf->imsf_fmode != MCAST_EXCLUDE)
2050                 return -EINVAL;
2051
2052         rtnl_lock();
2053
2054         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2055         imr.imr_address.s_addr = msf->imsf_interface;
2056         imr.imr_ifindex = ifindex;
2057         in_dev = ip_mc_find_dev(net, &imr);
2058
2059         if (!in_dev) {
2060                 err = -ENODEV;
2061                 goto done;
2062         }
2063
2064         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2065         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2066                 leavegroup = 1;
2067                 goto done;
2068         }
2069
2070         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2071                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2072                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2073                         break;
2074         }
2075         if (!pmc) {             /* must have a prior join */
2076                 err = -EINVAL;
2077                 goto done;
2078         }
2079         if (msf->imsf_numsrc) {
2080                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2081                                                            GFP_KERNEL);
2082                 if (!newpsl) {
2083                         err = -ENOBUFS;
2084                         goto done;
2085                 }
2086                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2087                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2088                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2089                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2090                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2091                 if (err) {
2092                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2093                         goto done;
2094                 }
2095         } else {
2096                 newpsl = NULL;
2097                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2098                                      msf->imsf_fmode, 0, NULL, 0);
2099         }
2100         psl = pmc->sflist;
2101         if (psl) {
2102                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2103                         psl->sl_count, psl->sl_addr, 0);
2104                 /* decrease mem now to avoid the memleak warning */
2105                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2106                 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2107         } else
2108                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2109                         0, NULL, 0);
2110         rcu_assign_pointer(pmc->sflist, newpsl);
2111         pmc->sfmode = msf->imsf_fmode;
2112         err = 0;
2113 done:
2114         rtnl_unlock();
2115         if (leavegroup)
2116                 err = ip_mc_leave_group(sk, &imr);
2117         return err;
2118 }
2119
2120 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2121         struct ip_msfilter __user *optval, int __user *optlen)
2122 {
2123         int err, len, count, copycount;
2124         struct ip_mreqn imr;
2125         __be32 addr = msf->imsf_multiaddr;
2126         struct ip_mc_socklist *pmc;
2127         struct in_device *in_dev;
2128         struct inet_sock *inet = inet_sk(sk);
2129         struct ip_sf_socklist *psl;
2130         struct net *net = sock_net(sk);
2131
2132         if (!ipv4_is_multicast(addr))
2133                 return -EINVAL;
2134
2135         rtnl_lock();
2136
2137         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2138         imr.imr_address.s_addr = msf->imsf_interface;
2139         imr.imr_ifindex = 0;
2140         in_dev = ip_mc_find_dev(net, &imr);
2141
2142         if (!in_dev) {
2143                 err = -ENODEV;
2144                 goto done;
2145         }
2146         err = -EADDRNOTAVAIL;
2147
2148         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2149                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2150                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2151                         break;
2152         }
2153         if (!pmc)               /* must have a prior join */
2154                 goto done;
2155         msf->imsf_fmode = pmc->sfmode;
2156         psl = pmc->sflist;
2157         rtnl_unlock();
2158         if (!psl) {
2159                 len = 0;
2160                 count = 0;
2161         } else {
2162                 count = psl->sl_count;
2163         }
2164         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2165         len = copycount * sizeof(psl->sl_addr[0]);
2166         msf->imsf_numsrc = count;
2167         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2168             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2169                 return -EFAULT;
2170         }
2171         if (len &&
2172             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2173                 return -EFAULT;
2174         return 0;
2175 done:
2176         rtnl_unlock();
2177         return err;
2178 }
2179
2180 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2181         struct group_filter __user *optval, int __user *optlen)
2182 {
2183         int err, i, count, copycount;
2184         struct sockaddr_in *psin;
2185         __be32 addr;
2186         struct ip_mc_socklist *pmc;
2187         struct inet_sock *inet = inet_sk(sk);
2188         struct ip_sf_socklist *psl;
2189
2190         psin = (struct sockaddr_in *)&gsf->gf_group;
2191         if (psin->sin_family != AF_INET)
2192                 return -EINVAL;
2193         addr = psin->sin_addr.s_addr;
2194         if (!ipv4_is_multicast(addr))
2195                 return -EINVAL;
2196
2197         rtnl_lock();
2198
2199         err = -EADDRNOTAVAIL;
2200
2201         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2202                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2203                     pmc->multi.imr_ifindex == gsf->gf_interface)
2204                         break;
2205         }
2206         if (!pmc)               /* must have a prior join */
2207                 goto done;
2208         gsf->gf_fmode = pmc->sfmode;
2209         psl = pmc->sflist;
2210         rtnl_unlock();
2211         count = psl ? psl->sl_count : 0;
2212         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2213         gsf->gf_numsrc = count;
2214         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2215             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2216                 return -EFAULT;
2217         }
2218         for (i=0; i<copycount; i++) {
2219                 struct sockaddr_storage ss;
2220
2221                 psin = (struct sockaddr_in *)&ss;
2222                 memset(&ss, 0, sizeof(ss));
2223                 psin->sin_family = AF_INET;
2224                 psin->sin_addr.s_addr = psl->sl_addr[i];
2225                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2226                         return -EFAULT;
2227         }
2228         return 0;
2229 done:
2230         rtnl_unlock();
2231         return err;
2232 }
2233
2234 /*
2235  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2236  */
2237 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2238 {
2239         struct inet_sock *inet = inet_sk(sk);
2240         struct ip_mc_socklist *pmc;
2241         struct ip_sf_socklist *psl;
2242         int i;
2243         int ret;
2244
2245         ret = 1;
2246         if (!ipv4_is_multicast(loc_addr))
2247                 goto out;
2248
2249         rcu_read_lock();
2250         for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) {
2251                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2252                     pmc->multi.imr_ifindex == dif)
2253                         break;
2254         }
2255         ret = inet->mc_all;
2256         if (!pmc)
2257                 goto unlock;
2258         psl = pmc->sflist;
2259         ret = (pmc->sfmode == MCAST_EXCLUDE);
2260         if (!psl)
2261                 goto unlock;
2262
2263         for (i=0; i<psl->sl_count; i++) {
2264                 if (psl->sl_addr[i] == rmt_addr)
2265                         break;
2266         }
2267         ret = 0;
2268         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2269                 goto unlock;
2270         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2271                 goto unlock;
2272         ret = 1;
2273 unlock:
2274         rcu_read_unlock();
2275 out:
2276         return ret;
2277 }
2278
2279 /*
2280  *      A socket is closing.
2281  */
2282
2283 void ip_mc_drop_socket(struct sock *sk)
2284 {
2285         struct inet_sock *inet = inet_sk(sk);
2286         struct ip_mc_socklist *iml;
2287         struct net *net = sock_net(sk);
2288
2289         if (inet->mc_list == NULL)
2290                 return;
2291
2292         rtnl_lock();
2293         while ((iml = inet->mc_list) != NULL) {
2294                 struct in_device *in_dev;
2295                 rcu_assign_pointer(inet->mc_list, iml->next);
2296
2297                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2298                 (void) ip_mc_leave_src(sk, iml, in_dev);
2299                 if (in_dev != NULL) {
2300                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2301                         in_dev_put(in_dev);
2302                 }
2303                 /* decrease mem now to avoid the memleak warning */
2304                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2305                 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
2306         }
2307         rtnl_unlock();
2308 }
2309
2310 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2311 {
2312         struct ip_mc_list *im;
2313         struct ip_sf_list *psf;
2314         int rv = 0;
2315
2316         read_lock(&in_dev->mc_list_lock);
2317         for (im=in_dev->mc_list; im; im=im->next) {
2318                 if (im->multiaddr == mc_addr)
2319                         break;
2320         }
2321         if (im && proto == IPPROTO_IGMP) {
2322                 rv = 1;
2323         } else if (im) {
2324                 if (src_addr) {
2325                         for (psf=im->sources; psf; psf=psf->sf_next) {
2326                                 if (psf->sf_inaddr == src_addr)
2327                                         break;
2328                         }
2329                         if (psf)
2330                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2331                                         psf->sf_count[MCAST_EXCLUDE] !=
2332                                         im->sfcount[MCAST_EXCLUDE];
2333                         else
2334                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2335                 } else
2336                         rv = 1; /* unspecified source; tentatively allow */
2337         }
2338         read_unlock(&in_dev->mc_list_lock);
2339         return rv;
2340 }
2341
2342 #if defined(CONFIG_PROC_FS)
2343 struct igmp_mc_iter_state {
2344         struct seq_net_private p;
2345         struct net_device *dev;
2346         struct in_device *in_dev;
2347 };
2348
2349 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2350
2351 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2352 {
2353         struct net *net = seq_file_net(seq);
2354         struct ip_mc_list *im = NULL;
2355         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2356
2357         state->in_dev = NULL;
2358         for_each_netdev_rcu(net, state->dev) {
2359                 struct in_device *in_dev;
2360
2361                 in_dev = __in_dev_get_rcu(state->dev);
2362                 if (!in_dev)
2363                         continue;
2364                 read_lock(&in_dev->mc_list_lock);
2365                 im = in_dev->mc_list;
2366                 if (im) {
2367                         state->in_dev = in_dev;
2368                         break;
2369                 }
2370                 read_unlock(&in_dev->mc_list_lock);
2371         }
2372         return im;
2373 }
2374
2375 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2376 {
2377         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2378         im = im->next;
2379         while (!im) {
2380                 if (likely(state->in_dev != NULL))
2381                         read_unlock(&state->in_dev->mc_list_lock);
2382
2383                 state->dev = next_net_device_rcu(state->dev);
2384                 if (!state->dev) {
2385                         state->in_dev = NULL;
2386                         break;
2387                 }
2388                 state->in_dev = __in_dev_get_rcu(state->dev);
2389                 if (!state->in_dev)
2390                         continue;
2391                 read_lock(&state->in_dev->mc_list_lock);
2392                 im = state->in_dev->mc_list;
2393         }
2394         return im;
2395 }
2396
2397 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2398 {
2399         struct ip_mc_list *im = igmp_mc_get_first(seq);
2400         if (im)
2401                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2402                         --pos;
2403         return pos ? NULL : im;
2404 }
2405
2406 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2407         __acquires(rcu)
2408 {
2409         rcu_read_lock();
2410         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2411 }
2412
2413 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2414 {
2415         struct ip_mc_list *im;
2416         if (v == SEQ_START_TOKEN)
2417                 im = igmp_mc_get_first(seq);
2418         else
2419                 im = igmp_mc_get_next(seq, v);
2420         ++*pos;
2421         return im;
2422 }
2423
2424 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2425         __releases(rcu)
2426 {
2427         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2428         if (likely(state->in_dev != NULL)) {
2429                 read_unlock(&state->in_dev->mc_list_lock);
2430                 state->in_dev = NULL;
2431         }
2432         state->dev = NULL;
2433         rcu_read_unlock();
2434 }
2435
2436 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2437 {
2438         if (v == SEQ_START_TOKEN)
2439                 seq_puts(seq,
2440                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2441         else {
2442                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2443                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2444                 char   *querier;
2445 #ifdef CONFIG_IP_MULTICAST
2446                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2447                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2448                           "V3";
2449 #else
2450                 querier = "NONE";
2451 #endif
2452
2453                 if (state->in_dev->mc_list == im) {
2454                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2455                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2456                 }
2457
2458                 seq_printf(seq,
2459                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2460                            im->multiaddr, im->users,
2461                            im->tm_running, im->tm_running ?
2462                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2463                            im->reporter);
2464         }
2465         return 0;
2466 }
2467
2468 static const struct seq_operations igmp_mc_seq_ops = {
2469         .start  =       igmp_mc_seq_start,
2470         .next   =       igmp_mc_seq_next,
2471         .stop   =       igmp_mc_seq_stop,
2472         .show   =       igmp_mc_seq_show,
2473 };
2474
2475 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2476 {
2477         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2478                         sizeof(struct igmp_mc_iter_state));
2479 }
2480
2481 static const struct file_operations igmp_mc_seq_fops = {
2482         .owner          =       THIS_MODULE,
2483         .open           =       igmp_mc_seq_open,
2484         .read           =       seq_read,
2485         .llseek         =       seq_lseek,
2486         .release        =       seq_release_net,
2487 };
2488
2489 struct igmp_mcf_iter_state {
2490         struct seq_net_private p;
2491         struct net_device *dev;
2492         struct in_device *idev;
2493         struct ip_mc_list *im;
2494 };
2495
2496 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2497
2498 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2499 {
2500         struct net *net = seq_file_net(seq);
2501         struct ip_sf_list *psf = NULL;
2502         struct ip_mc_list *im = NULL;
2503         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2504
2505         state->idev = NULL;
2506         state->im = NULL;
2507         for_each_netdev_rcu(net, state->dev) {
2508                 struct in_device *idev;
2509                 idev = __in_dev_get_rcu(state->dev);
2510                 if (unlikely(idev == NULL))
2511                         continue;
2512                 read_lock(&idev->mc_list_lock);
2513                 im = idev->mc_list;
2514                 if (likely(im != NULL)) {
2515                         spin_lock_bh(&im->lock);
2516                         psf = im->sources;
2517                         if (likely(psf != NULL)) {
2518                                 state->im = im;
2519                                 state->idev = idev;
2520                                 break;
2521                         }
2522                         spin_unlock_bh(&im->lock);
2523                 }
2524                 read_unlock(&idev->mc_list_lock);
2525         }
2526         return psf;
2527 }
2528
2529 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2530 {
2531         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2532
2533         psf = psf->sf_next;
2534         while (!psf) {
2535                 spin_unlock_bh(&state->im->lock);
2536                 state->im = state->im->next;
2537                 while (!state->im) {
2538                         if (likely(state->idev != NULL))
2539                                 read_unlock(&state->idev->mc_list_lock);
2540
2541                         state->dev = next_net_device_rcu(state->dev);
2542                         if (!state->dev) {
2543                                 state->idev = NULL;
2544                                 goto out;
2545                         }
2546                         state->idev = __in_dev_get_rcu(state->dev);
2547                         if (!state->idev)
2548                                 continue;
2549                         read_lock(&state->idev->mc_list_lock);
2550                         state->im = state->idev->mc_list;
2551                 }
2552                 if (!state->im)
2553                         break;
2554                 spin_lock_bh(&state->im->lock);
2555                 psf = state->im->sources;
2556         }
2557 out:
2558         return psf;
2559 }
2560
2561 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2562 {
2563         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2564         if (psf)
2565                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2566                         --pos;
2567         return pos ? NULL : psf;
2568 }
2569
2570 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2571         __acquires(rcu)
2572 {
2573         rcu_read_lock();
2574         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2575 }
2576
2577 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2578 {
2579         struct ip_sf_list *psf;
2580         if (v == SEQ_START_TOKEN)
2581                 psf = igmp_mcf_get_first(seq);
2582         else
2583                 psf = igmp_mcf_get_next(seq, v);
2584         ++*pos;
2585         return psf;
2586 }
2587
2588 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2589         __releases(rcu)
2590 {
2591         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2592         if (likely(state->im != NULL)) {
2593                 spin_unlock_bh(&state->im->lock);
2594                 state->im = NULL;
2595         }
2596         if (likely(state->idev != NULL)) {
2597                 read_unlock(&state->idev->mc_list_lock);
2598                 state->idev = NULL;
2599         }
2600         state->dev = NULL;
2601         rcu_read_unlock();
2602 }
2603
2604 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2605 {
2606         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2607         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2608
2609         if (v == SEQ_START_TOKEN) {
2610                 seq_printf(seq,
2611                            "%3s %6s "
2612                            "%10s %10s %6s %6s\n", "Idx",
2613                            "Device", "MCA",
2614                            "SRC", "INC", "EXC");
2615         } else {
2616                 seq_printf(seq,
2617                            "%3d %6.6s 0x%08x "
2618                            "0x%08x %6lu %6lu\n",
2619                            state->dev->ifindex, state->dev->name,
2620                            ntohl(state->im->multiaddr),
2621                            ntohl(psf->sf_inaddr),
2622                            psf->sf_count[MCAST_INCLUDE],
2623                            psf->sf_count[MCAST_EXCLUDE]);
2624         }
2625         return 0;
2626 }
2627
2628 static const struct seq_operations igmp_mcf_seq_ops = {
2629         .start  =       igmp_mcf_seq_start,
2630         .next   =       igmp_mcf_seq_next,
2631         .stop   =       igmp_mcf_seq_stop,
2632         .show   =       igmp_mcf_seq_show,
2633 };
2634
2635 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2636 {
2637         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2638                         sizeof(struct igmp_mcf_iter_state));
2639 }
2640
2641 static const struct file_operations igmp_mcf_seq_fops = {
2642         .owner          =       THIS_MODULE,
2643         .open           =       igmp_mcf_seq_open,
2644         .read           =       seq_read,
2645         .llseek         =       seq_lseek,
2646         .release        =       seq_release_net,
2647 };
2648
2649 static int __net_init igmp_net_init(struct net *net)
2650 {
2651         struct proc_dir_entry *pde;
2652
2653         pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2654         if (!pde)
2655                 goto out_igmp;
2656         pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2657         if (!pde)
2658                 goto out_mcfilter;
2659         return 0;
2660
2661 out_mcfilter:
2662         proc_net_remove(net, "igmp");
2663 out_igmp:
2664         return -ENOMEM;
2665 }
2666
2667 static void __net_exit igmp_net_exit(struct net *net)
2668 {
2669         proc_net_remove(net, "mcfilter");
2670         proc_net_remove(net, "igmp");
2671 }
2672
2673 static struct pernet_operations igmp_net_ops = {
2674         .init = igmp_net_init,
2675         .exit = igmp_net_exit,
2676 };
2677
2678 int __init igmp_mc_proc_init(void)
2679 {
2680         return register_pernet_subsys(&igmp_net_ops);
2681 }
2682 #endif