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->u.dst);
 316         skb->dev = dev;
 317
 318         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 319
 320         skb_reset_network_header(skb);
 321         pip = ip_hdr(skb);
 322         skb_put(skb, sizeof(struct iphdr) + 4);
 323
 324         pip->version  = 4;
 325         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 326         pip->tos      = 0xc0;
 327         pip->frag_off = htons(IP_DF);
 328         pip->ttl      = 1;
 329         pip->daddr    = rt->rt_dst;
 330         pip->saddr    = rt->rt_src;
 331         pip->protocol = IPPROTO_IGMP;
 332         pip->tot_len  = 0;      /* filled in later */
 333         ip_select_ident(pip, &rt->u.dst, NULL);
 334         ((u8*)&pip[1])[0] = IPOPT_RA;
 335         ((u8*)&pip[1])[1] = 4;
 336         ((u8*)&pip[1])[2] = 0;
 337         ((u8*)&pip[1])[3] = 0;
 338
 339         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 340         skb_put(skb, sizeof(*pig));
 341         pig = igmpv3_report_hdr(skb);
 342         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 343         pig->resv1 = 0;
 344         pig->csum = 0;
 345         pig->resv2 = 0;
 346         pig->ngrec = 0;
 347         return skb;
 348 }
 349
 350 static int igmpv3_sendpack(struct sk_buff *skb)
 351 {
 352         struct igmphdr *pig = igmp_hdr(skb);
 353         const int igmplen = skb->tail - skb->transport_header;
 354
 355         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 356
 357         return ip_local_out(skb);
 358 }
 359
 360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 361 {
 362         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
 363 }
 364
 365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 366         int type, struct igmpv3_grec **ppgr)
 367 {
 368         struct net_device *dev = pmc->interface->dev;
 369         struct igmpv3_report *pih;
 370         struct igmpv3_grec *pgr;
 371
 372         if (!skb)
 373                 skb = igmpv3_newpack(dev, dev->mtu);
 374         if (!skb)
 375                 return NULL;
 376         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 377         pgr->grec_type = type;
 378         pgr->grec_auxwords = 0;
 379         pgr->grec_nsrcs = 0;
 380         pgr->grec_mca = pmc->multiaddr;
 381         pih = igmpv3_report_hdr(skb);
 382         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 383         *ppgr = pgr;
 384         return skb;
 385 }
 386
 387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 388         skb_tailroom(skb)) : 0)
 389
 390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 391         int type, int gdeleted, int sdeleted)
 392 {
 393         struct net_device *dev = pmc->interface->dev;
 394         struct igmpv3_report *pih;
 395         struct igmpv3_grec *pgr = NULL;
 396         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 397         int scount, stotal, first, isquery, truncate;
 398
 399         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 400                 return skb;
 401
 402         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 403                   type == IGMPV3_MODE_IS_EXCLUDE;
 404         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 405                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 406
 407         stotal = scount = 0;
 408
 409         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 410
 411         if (!*psf_list)
 412                 goto empty_source;
 413
 414         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 415
 416         /* EX and TO_EX get a fresh packet, if needed */
 417         if (truncate) {
 418                 if (pih && pih->ngrec &&
 419                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 420                         if (skb)
 421                                 igmpv3_sendpack(skb);
 422                         skb = igmpv3_newpack(dev, dev->mtu);
 423                 }
 424         }
 425         first = 1;
 426         psf_prev = NULL;
 427         for (psf=*psf_list; psf; psf=psf_next) {
 428                 __be32 *psrc;
 429
 430                 psf_next = psf->sf_next;
 431
 432                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 433                         psf_prev = psf;
 434                         continue;
 435                 }
 436
 437                 /* clear marks on query responses */
 438                 if (isquery)
 439                         psf->sf_gsresp = 0;
 440
 441                 if (AVAILABLE(skb) < sizeof(__be32) +
 442                     first*sizeof(struct igmpv3_grec)) {
 443                         if (truncate && !first)
 444                                 break;   /* truncate these */
 445                         if (pgr)
 446                                 pgr->grec_nsrcs = htons(scount);
 447                         if (skb)
 448                                 igmpv3_sendpack(skb);
 449                         skb = igmpv3_newpack(dev, dev->mtu);
 450                         first = 1;
 451                         scount = 0;
 452                 }
 453                 if (first) {
 454                         skb = add_grhead(skb, pmc, type, &pgr);
 455                         first = 0;
 456                 }
 457                 if (!skb)
 458                         return NULL;
 459                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 460                 *psrc = psf->sf_inaddr;
 461                 scount++; stotal++;
 462                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 463                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 464                         psf->sf_crcount--;
 465                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 466                                 if (psf_prev)
 467                                         psf_prev->sf_next = psf->sf_next;
 468                                 else
 469                                         *psf_list = psf->sf_next;
 470                                 kfree(psf);
 471                                 continue;
 472                         }
 473                 }
 474                 psf_prev = psf;
 475         }
 476
 477 empty_source:
 478         if (!stotal) {
 479                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 480                     type == IGMPV3_BLOCK_OLD_SOURCES)
 481                         return skb;
 482                 if (pmc->crcount || isquery) {
 483                         /* make sure we have room for group header */
 484                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 485                                 igmpv3_sendpack(skb);
 486                                 skb = NULL; /* add_grhead will get a new one */
 487                         }
 488                         skb = add_grhead(skb, pmc, type, &pgr);
 489                 }
 490         }
 491         if (pgr)
 492                 pgr->grec_nsrcs = htons(scount);
 493
 494         if (isquery)
 495                 pmc->gsquery = 0;       /* clear query state on report */
 496         return skb;
 497 }
 498
 499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 500 {
 501         struct sk_buff *skb = NULL;
 502         int type;
 503
 504         if (!pmc) {
 505                 read_lock(&in_dev->mc_list_lock);
 506                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 507                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 508                                 continue;
 509                         spin_lock_bh(&pmc->lock);
 510                         if (pmc->sfcount[MCAST_EXCLUDE])
 511                                 type = IGMPV3_MODE_IS_EXCLUDE;
 512                         else
 513                                 type = IGMPV3_MODE_IS_INCLUDE;
 514                         skb = add_grec(skb, pmc, type, 0, 0);
 515                         spin_unlock_bh(&pmc->lock);
 516                 }
 517                 read_unlock(&in_dev->mc_list_lock);
 518         } else {
 519                 spin_lock_bh(&pmc->lock);
 520                 if (pmc->sfcount[MCAST_EXCLUDE])
 521                         type = IGMPV3_MODE_IS_EXCLUDE;
 522                 else
 523                         type = IGMPV3_MODE_IS_INCLUDE;
 524                 skb = add_grec(skb, pmc, type, 0, 0);
 525                 spin_unlock_bh(&pmc->lock);
 526         }
 527         if (!skb)
 528                 return 0;
 529         return igmpv3_sendpack(skb);
 530 }
 531
 532 /*
 533  * remove zero-count source records from a source filter list
 534  */
 535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 536 {
 537         struct ip_sf_list *psf_prev, *psf_next, *psf;
 538
 539         psf_prev = NULL;
 540         for (psf=*ppsf; psf; psf = psf_next) {
 541                 psf_next = psf->sf_next;
 542                 if (psf->sf_crcount == 0) {
 543                         if (psf_prev)
 544                                 psf_prev->sf_next = psf->sf_next;
 545                         else
 546                                 *ppsf = psf->sf_next;
 547                         kfree(psf);
 548                 } else
 549                         psf_prev = psf;
 550         }
 551 }
 552
 553 static void igmpv3_send_cr(struct in_device *in_dev)
 554 {
 555         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 556         struct sk_buff *skb = NULL;
 557         int type, dtype;
 558
 559         read_lock(&in_dev->mc_list_lock);
 560         spin_lock_bh(&in_dev->mc_tomb_lock);
 561
 562         /* deleted MCA's */
 563         pmc_prev = NULL;
 564         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 565                 pmc_next = pmc->next;
 566                 if (pmc->sfmode == MCAST_INCLUDE) {
 567                         type = IGMPV3_BLOCK_OLD_SOURCES;
 568                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 569                         skb = add_grec(skb, pmc, type, 1, 0);
 570                         skb = add_grec(skb, pmc, dtype, 1, 1);
 571                 }
 572                 if (pmc->crcount) {
 573                         if (pmc->sfmode == MCAST_EXCLUDE) {
 574                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 575                                 skb = add_grec(skb, pmc, type, 1, 0);
 576                         }
 577                         pmc->crcount--;
 578                         if (pmc->crcount == 0) {
 579                                 igmpv3_clear_zeros(&pmc->tomb);
 580                                 igmpv3_clear_zeros(&pmc->sources);
 581                         }
 582                 }
 583                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 584                         if (pmc_prev)
 585                                 pmc_prev->next = pmc_next;
 586                         else
 587                                 in_dev->mc_tomb = pmc_next;
 588                         in_dev_put(pmc->interface);
 589                         kfree(pmc);
 590                 } else
 591                         pmc_prev = pmc;
 592         }
 593         spin_unlock_bh(&in_dev->mc_tomb_lock);
 594
 595         /* change recs */
 596         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 597                 spin_lock_bh(&pmc->lock);
 598                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 599                         type = IGMPV3_BLOCK_OLD_SOURCES;
 600                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 601                 } else {
 602                         type = IGMPV3_ALLOW_NEW_SOURCES;
 603                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 604                 }
 605                 skb = add_grec(skb, pmc, type, 0, 0);
 606                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 607
 608                 /* filter mode changes */
 609                 if (pmc->crcount) {
 610                         if (pmc->sfmode == MCAST_EXCLUDE)
 611                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 612                         else
 613                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 614                         skb = add_grec(skb, pmc, type, 0, 0);
 615                         pmc->crcount--;
 616                 }
 617                 spin_unlock_bh(&pmc->lock);
 618         }
 619         read_unlock(&in_dev->mc_list_lock);
 620
 621         if (!skb)
 622                 return;
 623         (void) igmpv3_sendpack(skb);
 624 }
 625
 626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 627         int type)
 628 {
 629         struct sk_buff *skb;
 630         struct iphdr *iph;
 631         struct igmphdr *ih;
 632         struct rtable *rt;
 633         struct net_device *dev = in_dev->dev;
 634         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->u.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->u.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) {
 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 int igmp_rcv(struct sk_buff *skb)
 920 {
 921         /* This basically follows the spec line by line -- see RFC1112 */
 922         struct igmphdr *ih;
 923         struct in_device *in_dev = in_dev_get(skb->dev);
 924         int len = skb->len;
 925
 926         if (in_dev == NULL)
 927                 goto drop;
 928
 929         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 930                 goto drop_ref;
 931
 932         switch (skb->ip_summed) {
 933         case CHECKSUM_COMPLETE:
 934                 if (!csum_fold(skb->csum))
 935                         break;
 936                 /* fall through */
 937         case CHECKSUM_NONE:
 938                 skb->csum = 0;
 939                 if (__skb_checksum_complete(skb))
 940                         goto drop_ref;
 941         }
 942
 943         ih = igmp_hdr(skb);
 944         switch (ih->type) {
 945         case IGMP_HOST_MEMBERSHIP_QUERY:
 946                 igmp_heard_query(in_dev, skb, len);
 947                 break;
 948         case IGMP_HOST_MEMBERSHIP_REPORT:
 949         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 950                 /* Is it our report looped back? */
 951                 if (skb_rtable(skb)->fl.iif == 0)
 952                         break;
 953                 /* don't rely on MC router hearing unicast reports */
 954                 if (skb->pkt_type == PACKET_MULTICAST ||
 955                     skb->pkt_type == PACKET_BROADCAST)
 956                         igmp_heard_report(in_dev, ih->group);
 957                 break;
 958         case IGMP_PIM:
 959 #ifdef CONFIG_IP_PIMSM_V1
 960                 in_dev_put(in_dev);
 961                 return pim_rcv_v1(skb);
 962 #endif
 963         case 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_ref:
 975         in_dev_put(in_dev);
 976 drop:
 977         kfree_skb(skb);
 978         return 0;
 979 }
 980
 981 #endif
 982
 983
 984 /*
 985  *      Add a filter to a device
 986  */
 987
 988 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 989 {
 990         char buf[MAX_ADDR_LEN];
 991         struct net_device *dev = in_dev->dev;
 992
 993         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 994            We will get multicast token leakage, when IFF_MULTICAST
 995            is changed. This check should be done in dev->set_multicast_list
 996            routine. Something sort of:
 997            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 998            --ANK
 999            */
1000         if (arp_mc_map(addr, buf, dev, 0) == 0)
1001                 dev_mc_add(dev, buf);
1002 }
1003
1004 /*
1005  *      Remove a filter from a device
1006  */
1007
1008 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1009 {
1010         char buf[MAX_ADDR_LEN];
1011         struct net_device *dev = in_dev->dev;
1012
1013         if (arp_mc_map(addr, buf, dev, 0) == 0)
1014                 dev_mc_del(dev, buf);
1015 }
1016
1017 #ifdef CONFIG_IP_MULTICAST
1018 /*
1019  * deleted ip_mc_list manipulation
1020  */
1021 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1022 {
1023         struct ip_mc_list *pmc;
1024
1025         /* this is an "ip_mc_list" for convenience; only the fields below
1026          * are actually used. In particular, the refcnt and users are not
1027          * used for management of the delete list. Using the same structure
1028          * for deleted items allows change reports to use common code with
1029          * non-deleted or query-response MCA's.
1030          */
1031         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1032         if (!pmc)
1033                 return;
1034         spin_lock_bh(&im->lock);
1035         pmc->interface = im->interface;
1036         in_dev_hold(in_dev);
1037         pmc->multiaddr = im->multiaddr;
1038         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1039                 IGMP_Unsolicited_Report_Count;
1040         pmc->sfmode = im->sfmode;
1041         if (pmc->sfmode == MCAST_INCLUDE) {
1042                 struct ip_sf_list *psf;
1043
1044                 pmc->tomb = im->tomb;
1045                 pmc->sources = im->sources;
1046                 im->tomb = im->sources = NULL;
1047                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1048                         psf->sf_crcount = pmc->crcount;
1049         }
1050         spin_unlock_bh(&im->lock);
1051
1052         spin_lock_bh(&in_dev->mc_tomb_lock);
1053         pmc->next = in_dev->mc_tomb;
1054         in_dev->mc_tomb = pmc;
1055         spin_unlock_bh(&in_dev->mc_tomb_lock);
1056 }
1057
1058 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1059 {
1060         struct ip_mc_list *pmc, *pmc_prev;
1061         struct ip_sf_list *psf, *psf_next;
1062
1063         spin_lock_bh(&in_dev->mc_tomb_lock);
1064         pmc_prev = NULL;
1065         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1066                 if (pmc->multiaddr == multiaddr)
1067                         break;
1068                 pmc_prev = pmc;
1069         }
1070         if (pmc) {
1071                 if (pmc_prev)
1072                         pmc_prev->next = pmc->next;
1073                 else
1074                         in_dev->mc_tomb = pmc->next;
1075         }
1076         spin_unlock_bh(&in_dev->mc_tomb_lock);
1077         if (pmc) {
1078                 for (psf=pmc->tomb; psf; psf=psf_next) {
1079                         psf_next = psf->sf_next;
1080                         kfree(psf);
1081                 }
1082                 in_dev_put(pmc->interface);
1083                 kfree(pmc);
1084         }
1085 }
1086
1087 static void igmpv3_clear_delrec(struct in_device *in_dev)
1088 {
1089         struct ip_mc_list *pmc, *nextpmc;
1090
1091         spin_lock_bh(&in_dev->mc_tomb_lock);
1092         pmc = in_dev->mc_tomb;
1093         in_dev->mc_tomb = NULL;
1094         spin_unlock_bh(&in_dev->mc_tomb_lock);
1095
1096         for (; pmc; pmc = nextpmc) {
1097                 nextpmc = pmc->next;
1098                 ip_mc_clear_src(pmc);
1099                 in_dev_put(pmc->interface);
1100                 kfree(pmc);
1101         }
1102         /* clear dead sources, too */
1103         read_lock(&in_dev->mc_list_lock);
1104         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1105                 struct ip_sf_list *psf, *psf_next;
1106
1107                 spin_lock_bh(&pmc->lock);
1108                 psf = pmc->tomb;
1109                 pmc->tomb = NULL;
1110                 spin_unlock_bh(&pmc->lock);
1111                 for (; psf; psf=psf_next) {
1112                         psf_next = psf->sf_next;
1113                         kfree(psf);
1114                 }
1115         }
1116         read_unlock(&in_dev->mc_list_lock);
1117 }
1118 #endif
1119
1120 static void igmp_group_dropped(struct ip_mc_list *im)
1121 {
1122         struct in_device *in_dev = im->interface;
1123 #ifdef CONFIG_IP_MULTICAST
1124         int reporter;
1125 #endif
1126
1127         if (im->loaded) {
1128                 im->loaded = 0;
1129                 ip_mc_filter_del(in_dev, im->multiaddr);
1130         }
1131
1132 #ifdef CONFIG_IP_MULTICAST
1133         if (im->multiaddr == IGMP_ALL_HOSTS)
1134                 return;
1135
1136         reporter = im->reporter;
1137         igmp_stop_timer(im);
1138
1139         if (!in_dev->dead) {
1140                 if (IGMP_V1_SEEN(in_dev))
1141                         goto done;
1142                 if (IGMP_V2_SEEN(in_dev)) {
1143                         if (reporter)
1144                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1145                         goto done;
1146                 }
1147                 /* IGMPv3 */
1148                 igmpv3_add_delrec(in_dev, im);
1149
1150                 igmp_ifc_event(in_dev);
1151         }
1152 done:
1153 #endif
1154         ip_mc_clear_src(im);
1155 }
1156
1157 static void igmp_group_added(struct ip_mc_list *im)
1158 {
1159         struct in_device *in_dev = im->interface;
1160
1161         if (im->loaded == 0) {
1162                 im->loaded = 1;
1163                 ip_mc_filter_add(in_dev, im->multiaddr);
1164         }
1165
1166 #ifdef CONFIG_IP_MULTICAST
1167         if (im->multiaddr == IGMP_ALL_HOSTS)
1168                 return;
1169
1170         if (in_dev->dead)
1171                 return;
1172         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1173                 spin_lock_bh(&im->lock);
1174                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1175                 spin_unlock_bh(&im->lock);
1176                 return;
1177         }
1178         /* else, v3 */
1179
1180         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1181                 IGMP_Unsolicited_Report_Count;
1182         igmp_ifc_event(in_dev);
1183 #endif
1184 }
1185
1186
1187 /*
1188  *      Multicast list managers
1189  */
1190
1191
1192 /*
1193  *      A socket has joined a multicast group on device dev.
1194  */
1195
1196 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1197 {
1198         struct ip_mc_list *im;
1199
1200         ASSERT_RTNL();
1201
1202         for (im=in_dev->mc_list; im; im=im->next) {
1203                 if (im->multiaddr == addr) {
1204                         im->users++;
1205                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1206                         goto out;
1207                 }
1208         }
1209
1210         im = kmalloc(sizeof(*im), GFP_KERNEL);
1211         if (!im)
1212                 goto out;
1213
1214         im->users = 1;
1215         im->interface = in_dev;
1216         in_dev_hold(in_dev);
1217         im->multiaddr = addr;
1218         /* initial mode is (EX, empty) */
1219         im->sfmode = MCAST_EXCLUDE;
1220         im->sfcount[MCAST_INCLUDE] = 0;
1221         im->sfcount[MCAST_EXCLUDE] = 1;
1222         im->sources = NULL;
1223         im->tomb = NULL;
1224         im->crcount = 0;
1225         atomic_set(&im->refcnt, 1);
1226         spin_lock_init(&im->lock);
1227 #ifdef CONFIG_IP_MULTICAST
1228         im->tm_running = 0;
1229         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1230         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1231         im->reporter = 0;
1232         im->gsquery = 0;
1233 #endif
1234         im->loaded = 0;
1235         write_lock_bh(&in_dev->mc_list_lock);
1236         im->next = in_dev->mc_list;
1237         in_dev->mc_list = im;
1238         in_dev->mc_count++;
1239         write_unlock_bh(&in_dev->mc_list_lock);
1240 #ifdef CONFIG_IP_MULTICAST
1241         igmpv3_del_delrec(in_dev, im->multiaddr);
1242 #endif
1243         igmp_group_added(im);
1244         if (!in_dev->dead)
1245                 ip_rt_multicast_event(in_dev);
1246 out:
1247         return;
1248 }
1249
1250 /*
1251  *      Resend IGMP JOIN report; used for bonding.
1252  */
1253 void ip_mc_rejoin_group(struct ip_mc_list *im)
1254 {
1255 #ifdef CONFIG_IP_MULTICAST
1256         struct in_device *in_dev = im->interface;
1257
1258         if (im->multiaddr == IGMP_ALL_HOSTS)
1259                 return;
1260
1261         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1262                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1263                 return;
1264         }
1265         /* else, v3 */
1266         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1267                 IGMP_Unsolicited_Report_Count;
1268         igmp_ifc_event(in_dev);
1269 #endif
1270 }
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
1302 /* Device changing type */
1303
1304 void ip_mc_unmap(struct in_device *in_dev)
1305 {
1306         struct ip_mc_list *i;
1307
1308         ASSERT_RTNL();
1309
1310         for (i = in_dev->mc_list; i; i = i->next)
1311                 igmp_group_dropped(i);
1312 }
1313
1314 void ip_mc_remap(struct in_device *in_dev)
1315 {
1316         struct ip_mc_list *i;
1317
1318         ASSERT_RTNL();
1319
1320         for (i = in_dev->mc_list; i; i = i->next)
1321                 igmp_group_added(i);
1322 }
1323
1324 /* Device going down */
1325
1326 void ip_mc_down(struct in_device *in_dev)
1327 {
1328         struct ip_mc_list *i;
1329
1330         ASSERT_RTNL();
1331
1332         for (i=in_dev->mc_list; i; i=i->next)
1333                 igmp_group_dropped(i);
1334
1335 #ifdef CONFIG_IP_MULTICAST
1336         in_dev->mr_ifc_count = 0;
1337         if (del_timer(&in_dev->mr_ifc_timer))
1338                 __in_dev_put(in_dev);
1339         in_dev->mr_gq_running = 0;
1340         if (del_timer(&in_dev->mr_gq_timer))
1341                 __in_dev_put(in_dev);
1342         igmpv3_clear_delrec(in_dev);
1343 #endif
1344
1345         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1346 }
1347
1348 void ip_mc_init_dev(struct in_device *in_dev)
1349 {
1350         ASSERT_RTNL();
1351
1352         in_dev->mc_tomb = NULL;
1353 #ifdef CONFIG_IP_MULTICAST
1354         in_dev->mr_gq_running = 0;
1355         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1356                         (unsigned long)in_dev);
1357         in_dev->mr_ifc_count = 0;
1358         in_dev->mc_count     = 0;
1359         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1360                         (unsigned long)in_dev);
1361         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1362 #endif
1363
1364         rwlock_init(&in_dev->mc_list_lock);
1365         spin_lock_init(&in_dev->mc_tomb_lock);
1366 }
1367
1368 /* Device going up */
1369
1370 void ip_mc_up(struct in_device *in_dev)
1371 {
1372         struct ip_mc_list *i;
1373
1374         ASSERT_RTNL();
1375
1376         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1377
1378         for (i=in_dev->mc_list; i; i=i->next)
1379                 igmp_group_added(i);
1380 }
1381
1382 /*
1383  *      Device is about to be destroyed: clean up.
1384  */
1385
1386 void ip_mc_destroy_dev(struct in_device *in_dev)
1387 {
1388         struct ip_mc_list *i;
1389
1390         ASSERT_RTNL();
1391
1392         /* Deactivate timers */
1393         ip_mc_down(in_dev);
1394
1395         write_lock_bh(&in_dev->mc_list_lock);
1396         while ((i = in_dev->mc_list) != NULL) {
1397                 in_dev->mc_list = i->next;
1398                 in_dev->mc_count--;
1399                 write_unlock_bh(&in_dev->mc_list_lock);
1400                 igmp_group_dropped(i);
1401                 ip_ma_put(i);
1402
1403                 write_lock_bh(&in_dev->mc_list_lock);
1404         }
1405         write_unlock_bh(&in_dev->mc_list_lock);
1406 }
1407
1408 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1409 {
1410         struct flowi fl = { .nl_u = { .ip4_u =
1411                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1412         struct rtable *rt;
1413         struct net_device *dev = NULL;
1414         struct in_device *idev = NULL;
1415
1416         if (imr->imr_ifindex) {
1417                 idev = inetdev_by_index(net, imr->imr_ifindex);
1418                 if (idev)
1419                         __in_dev_put(idev);
1420                 return idev;
1421         }
1422         if (imr->imr_address.s_addr) {
1423                 dev = ip_dev_find(net, imr->imr_address.s_addr);
1424                 if (!dev)
1425                         return NULL;
1426                 dev_put(dev);
1427         }
1428
1429         if (!dev && !ip_route_output_key(net, &rt, &fl)) {
1430                 dev = rt->u.dst.dev;
1431                 ip_rt_put(rt);
1432         }
1433         if (dev) {
1434                 imr->imr_ifindex = dev->ifindex;
1435                 idev = __in_dev_get_rtnl(dev);
1436         }
1437         return idev;
1438 }
1439
1440 /*
1441  *      Join a socket to a group
1442  */
1443 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1444 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1445
1446
1447 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1448         __be32 *psfsrc)
1449 {
1450         struct ip_sf_list *psf, *psf_prev;
1451         int rv = 0;
1452
1453         psf_prev = NULL;
1454         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1455                 if (psf->sf_inaddr == *psfsrc)
1456                         break;
1457                 psf_prev = psf;
1458         }
1459         if (!psf || psf->sf_count[sfmode] == 0) {
1460                 /* source filter not found, or count wrong =>  bug */
1461                 return -ESRCH;
1462         }
1463         psf->sf_count[sfmode]--;
1464         if (psf->sf_count[sfmode] == 0) {
1465                 ip_rt_multicast_event(pmc->interface);
1466         }
1467         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1468 #ifdef CONFIG_IP_MULTICAST
1469                 struct in_device *in_dev = pmc->interface;
1470 #endif
1471
1472                 /* no more filters for this source */
1473                 if (psf_prev)
1474                         psf_prev->sf_next = psf->sf_next;
1475                 else
1476                         pmc->sources = psf->sf_next;
1477 #ifdef CONFIG_IP_MULTICAST
1478                 if (psf->sf_oldin &&
1479                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1480                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1481                                 IGMP_Unsolicited_Report_Count;
1482                         psf->sf_next = pmc->tomb;
1483                         pmc->tomb = psf;
1484                         rv = 1;
1485                 } else
1486 #endif
1487                         kfree(psf);
1488         }
1489         return rv;
1490 }
1491
1492 #ifndef CONFIG_IP_MULTICAST
1493 #define igmp_ifc_event(x)       do { } while (0)
1494 #endif
1495
1496 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1497                          int sfcount, __be32 *psfsrc, int delta)
1498 {
1499         struct ip_mc_list *pmc;
1500         int     changerec = 0;
1501         int     i, err;
1502
1503         if (!in_dev)
1504                 return -ENODEV;
1505         read_lock(&in_dev->mc_list_lock);
1506         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1507                 if (*pmca == pmc->multiaddr)
1508                         break;
1509         }
1510         if (!pmc) {
1511                 /* MCA not found?? bug */
1512                 read_unlock(&in_dev->mc_list_lock);
1513                 return -ESRCH;
1514         }
1515         spin_lock_bh(&pmc->lock);
1516         read_unlock(&in_dev->mc_list_lock);
1517 #ifdef CONFIG_IP_MULTICAST
1518         sf_markstate(pmc);
1519 #endif
1520         if (!delta) {
1521                 err = -EINVAL;
1522                 if (!pmc->sfcount[sfmode])
1523                         goto out_unlock;
1524                 pmc->sfcount[sfmode]--;
1525         }
1526         err = 0;
1527         for (i=0; i<sfcount; i++) {
1528                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1529
1530                 changerec |= rv > 0;
1531                 if (!err && rv < 0)
1532                         err = rv;
1533         }
1534         if (pmc->sfmode == MCAST_EXCLUDE &&
1535             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1536             pmc->sfcount[MCAST_INCLUDE]) {
1537 #ifdef CONFIG_IP_MULTICAST
1538                 struct ip_sf_list *psf;
1539 #endif
1540
1541                 /* filter mode change */
1542                 pmc->sfmode = MCAST_INCLUDE;
1543 #ifdef CONFIG_IP_MULTICAST
1544                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1545                         IGMP_Unsolicited_Report_Count;
1546                 in_dev->mr_ifc_count = pmc->crcount;
1547                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1548                         psf->sf_crcount = 0;
1549                 igmp_ifc_event(pmc->interface);
1550         } else if (sf_setstate(pmc) || changerec) {
1551                 igmp_ifc_event(pmc->interface);
1552 #endif
1553         }
1554 out_unlock:
1555         spin_unlock_bh(&pmc->lock);
1556         return err;
1557 }
1558
1559 /*
1560  * Add multicast single-source filter to the interface list
1561  */
1562 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1563         __be32 *psfsrc, int delta)
1564 {
1565         struct ip_sf_list *psf, *psf_prev;
1566
1567         psf_prev = NULL;
1568         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1569                 if (psf->sf_inaddr == *psfsrc)
1570                         break;
1571                 psf_prev = psf;
1572         }
1573         if (!psf) {
1574                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1575                 if (!psf)
1576                         return -ENOBUFS;
1577                 psf->sf_inaddr = *psfsrc;
1578                 if (psf_prev) {
1579                         psf_prev->sf_next = psf;
1580                 } else
1581                         pmc->sources = psf;
1582         }
1583         psf->sf_count[sfmode]++;
1584         if (psf->sf_count[sfmode] == 1) {
1585                 ip_rt_multicast_event(pmc->interface);
1586         }
1587         return 0;
1588 }
1589
1590 #ifdef CONFIG_IP_MULTICAST
1591 static void sf_markstate(struct ip_mc_list *pmc)
1592 {
1593         struct ip_sf_list *psf;
1594         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1595
1596         for (psf=pmc->sources; psf; psf=psf->sf_next)
1597                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1598                         psf->sf_oldin = mca_xcount ==
1599                                 psf->sf_count[MCAST_EXCLUDE] &&
1600                                 !psf->sf_count[MCAST_INCLUDE];
1601                 } else
1602                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1603 }
1604
1605 static int sf_setstate(struct ip_mc_list *pmc)
1606 {
1607         struct ip_sf_list *psf, *dpsf;
1608         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1609         int qrv = pmc->interface->mr_qrv;
1610         int new_in, rv;
1611
1612         rv = 0;
1613         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1614                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1615                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1616                                 !psf->sf_count[MCAST_INCLUDE];
1617                 } else
1618                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1619                 if (new_in) {
1620                         if (!psf->sf_oldin) {
1621                                 struct ip_sf_list *prev = NULL;
1622
1623                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1624                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1625                                                 break;
1626                                         prev = dpsf;
1627                                 }
1628                                 if (dpsf) {
1629                                         if (prev)
1630                                                 prev->sf_next = dpsf->sf_next;
1631                                         else
1632                                                 pmc->tomb = dpsf->sf_next;
1633                                         kfree(dpsf);
1634                                 }
1635                                 psf->sf_crcount = qrv;
1636                                 rv++;
1637                         }
1638                 } else if (psf->sf_oldin) {
1639
1640                         psf->sf_crcount = 0;
1641                         /*
1642                          * add or update "delete" records if an active filter
1643                          * is now inactive
1644                          */
1645                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1646                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1647                                         break;
1648                         if (!dpsf) {
1649                                 dpsf = (struct ip_sf_list *)
1650                                         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
1811 static void ip_sf_socklist_reclaim(struct rcu_head *rp)
1812 {
1813         struct ip_sf_socklist *psf;
1814
1815         psf = container_of(rp, struct ip_sf_socklist, rcu);
1816         /* sk_omem_alloc should have been decreased by the caller*/
1817         kfree(psf);
1818 }
1819
1820 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1821                            struct in_device *in_dev)
1822 {
1823         struct ip_sf_socklist *psf = iml->sflist;
1824         int err;
1825
1826         if (psf == NULL) {
1827                 /* any-source empty exclude case */
1828                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1829                         iml->sfmode, 0, NULL, 0);
1830         }
1831         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1832                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1833         rcu_assign_pointer(iml->sflist, NULL);
1834         /* decrease mem now to avoid the memleak warning */
1835         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1836         call_rcu(&psf->rcu, ip_sf_socklist_reclaim);
1837         return err;
1838 }
1839
1840
1841 static void ip_mc_socklist_reclaim(struct rcu_head *rp)
1842 {
1843         struct ip_mc_socklist *iml;
1844
1845         iml = container_of(rp, struct ip_mc_socklist, rcu);
1846         /* sk_omem_alloc should have been decreased by the caller*/
1847         kfree(iml);
1848 }
1849
1850
1851 /*
1852  *      Ask a socket to leave a group.
1853  */
1854
1855 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1856 {
1857         struct inet_sock *inet = inet_sk(sk);
1858         struct ip_mc_socklist *iml, **imlp;
1859         struct in_device *in_dev;
1860         struct net *net = sock_net(sk);
1861         __be32 group = imr->imr_multiaddr.s_addr;
1862         u32 ifindex;
1863         int ret = -EADDRNOTAVAIL;
1864
1865         rtnl_lock();
1866         in_dev = ip_mc_find_dev(net, imr);
1867         ifindex = imr->imr_ifindex;
1868         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1869                 if (iml->multi.imr_multiaddr.s_addr != group)
1870                         continue;
1871                 if (ifindex) {
1872                         if (iml->multi.imr_ifindex != ifindex)
1873                                 continue;
1874                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1875                                 iml->multi.imr_address.s_addr)
1876                         continue;
1877
1878                 (void) ip_mc_leave_src(sk, iml, in_dev);
1879
1880                 rcu_assign_pointer(*imlp, iml->next);
1881
1882                 if (in_dev)
1883                         ip_mc_dec_group(in_dev, group);
1884                 rtnl_unlock();
1885                 /* decrease mem now to avoid the memleak warning */
1886                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1887                 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
1888                 return 0;
1889         }
1890         if (!in_dev)
1891                 ret = -ENODEV;
1892         rtnl_unlock();
1893         return ret;
1894 }
1895
1896 int ip_mc_source(int add, int omode, struct sock *sk, struct
1897         ip_mreq_source *mreqs, int ifindex)
1898 {
1899         int err;
1900         struct ip_mreqn imr;
1901         __be32 addr = mreqs->imr_multiaddr;
1902         struct ip_mc_socklist *pmc;
1903         struct in_device *in_dev = NULL;
1904         struct inet_sock *inet = inet_sk(sk);
1905         struct ip_sf_socklist *psl;
1906         struct net *net = sock_net(sk);
1907         int leavegroup = 0;
1908         int i, j, rv;
1909
1910         if (!ipv4_is_multicast(addr))
1911                 return -EINVAL;
1912
1913         rtnl_lock();
1914
1915         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1916         imr.imr_address.s_addr = mreqs->imr_interface;
1917         imr.imr_ifindex = ifindex;
1918         in_dev = ip_mc_find_dev(net, &imr);
1919
1920         if (!in_dev) {
1921                 err = -ENODEV;
1922                 goto done;
1923         }
1924         err = -EADDRNOTAVAIL;
1925
1926         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1927                 if ((pmc->multi.imr_multiaddr.s_addr ==
1928                      imr.imr_multiaddr.s_addr) &&
1929                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
1930                         break;
1931         }
1932         if (!pmc) {             /* must have a prior join */
1933                 err = -EINVAL;
1934                 goto done;
1935         }
1936         /* if a source filter was set, must be the same mode as before */
1937         if (pmc->sflist) {
1938                 if (pmc->sfmode != omode) {
1939                         err = -EINVAL;
1940                         goto done;
1941                 }
1942         } else if (pmc->sfmode != omode) {
1943                 /* allow mode switches for empty-set filters */
1944                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1945                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1946                         NULL, 0);
1947                 pmc->sfmode = omode;
1948         }
1949
1950         psl = pmc->sflist;
1951         if (!add) {
1952                 if (!psl)
1953                         goto done;      /* err = -EADDRNOTAVAIL */
1954                 rv = !0;
1955                 for (i=0; i<psl->sl_count; i++) {
1956                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1957                                 sizeof(__be32));
1958                         if (rv == 0)
1959                                 break;
1960                 }
1961                 if (rv)         /* source not found */
1962                         goto done;      /* err = -EADDRNOTAVAIL */
1963
1964                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1965                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1966                         leavegroup = 1;
1967                         goto done;
1968                 }
1969
1970                 /* update the interface filter */
1971                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1972                         &mreqs->imr_sourceaddr, 1);
1973
1974                 for (j=i+1; j<psl->sl_count; j++)
1975                         psl->sl_addr[j-1] = psl->sl_addr[j];
1976                 psl->sl_count--;
1977                 err = 0;
1978                 goto done;
1979         }
1980         /* else, add a new source to the filter */
1981
1982         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1983                 err = -ENOBUFS;
1984                 goto done;
1985         }
1986         if (!psl || psl->sl_count == psl->sl_max) {
1987                 struct ip_sf_socklist *newpsl;
1988                 int count = IP_SFBLOCK;
1989
1990                 if (psl)
1991                         count += psl->sl_max;
1992                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1993                 if (!newpsl) {
1994                         err = -ENOBUFS;
1995                         goto done;
1996                 }
1997                 newpsl->sl_max = count;
1998                 newpsl->sl_count = count - IP_SFBLOCK;
1999                 if (psl) {
2000                         for (i=0; i<psl->sl_count; i++)
2001                                 newpsl->sl_addr[i] = psl->sl_addr[i];
2002                         /* decrease mem now to avoid the memleak warning */
2003                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2004                         call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2005                 }
2006                 rcu_assign_pointer(pmc->sflist, newpsl);
2007                 psl = newpsl;
2008         }
2009         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2010         for (i=0; i<psl->sl_count; i++) {
2011                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2012                         sizeof(__be32));
2013                 if (rv == 0)
2014                         break;
2015         }
2016         if (rv == 0)            /* address already there is an error */
2017                 goto done;
2018         for (j=psl->sl_count-1; j>=i; j--)
2019                 psl->sl_addr[j+1] = psl->sl_addr[j];
2020         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2021         psl->sl_count++;
2022         err = 0;
2023         /* update the interface list */
2024         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2025                 &mreqs->imr_sourceaddr, 1);
2026 done:
2027         rtnl_unlock();
2028         if (leavegroup)
2029                 return ip_mc_leave_group(sk, &imr);
2030         return err;
2031 }
2032
2033 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2034 {
2035         int err = 0;
2036         struct ip_mreqn imr;
2037         __be32 addr = msf->imsf_multiaddr;
2038         struct ip_mc_socklist *pmc;
2039         struct in_device *in_dev;
2040         struct inet_sock *inet = inet_sk(sk);
2041         struct ip_sf_socklist *newpsl, *psl;
2042         struct net *net = sock_net(sk);
2043         int leavegroup = 0;
2044
2045         if (!ipv4_is_multicast(addr))
2046                 return -EINVAL;
2047         if (msf->imsf_fmode != MCAST_INCLUDE &&
2048             msf->imsf_fmode != MCAST_EXCLUDE)
2049                 return -EINVAL;
2050
2051         rtnl_lock();
2052
2053         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2054         imr.imr_address.s_addr = msf->imsf_interface;
2055         imr.imr_ifindex = ifindex;
2056         in_dev = ip_mc_find_dev(net, &imr);
2057
2058         if (!in_dev) {
2059                 err = -ENODEV;
2060                 goto done;
2061         }
2062
2063         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2064         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2065                 leavegroup = 1;
2066                 goto done;
2067         }
2068
2069         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2070                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2071                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2072                         break;
2073         }
2074         if (!pmc) {             /* must have a prior join */
2075                 err = -EINVAL;
2076                 goto done;
2077         }
2078         if (msf->imsf_numsrc) {
2079                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2080                                                            GFP_KERNEL);
2081                 if (!newpsl) {
2082                         err = -ENOBUFS;
2083                         goto done;
2084                 }
2085                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2086                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2087                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2088                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2089                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2090                 if (err) {
2091                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2092                         goto done;
2093                 }
2094         } else {
2095                 newpsl = NULL;
2096                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2097                                      msf->imsf_fmode, 0, NULL, 0);
2098         }
2099         psl = pmc->sflist;
2100         if (psl) {
2101                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2102                         psl->sl_count, psl->sl_addr, 0);
2103                 /* decrease mem now to avoid the memleak warning */
2104                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2105                 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2106         } else
2107                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2108                         0, NULL, 0);
2109         rcu_assign_pointer(pmc->sflist, newpsl);
2110         pmc->sfmode = msf->imsf_fmode;
2111         err = 0;
2112 done:
2113         rtnl_unlock();
2114         if (leavegroup)
2115                 err = ip_mc_leave_group(sk, &imr);
2116         return err;
2117 }
2118
2119 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2120         struct ip_msfilter __user *optval, int __user *optlen)
2121 {
2122         int err, len, count, copycount;
2123         struct ip_mreqn imr;
2124         __be32 addr = msf->imsf_multiaddr;
2125         struct ip_mc_socklist *pmc;
2126         struct in_device *in_dev;
2127         struct inet_sock *inet = inet_sk(sk);
2128         struct ip_sf_socklist *psl;
2129         struct net *net = sock_net(sk);
2130
2131         if (!ipv4_is_multicast(addr))
2132                 return -EINVAL;
2133
2134         rtnl_lock();
2135
2136         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2137         imr.imr_address.s_addr = msf->imsf_interface;
2138         imr.imr_ifindex = 0;
2139         in_dev = ip_mc_find_dev(net, &imr);
2140
2141         if (!in_dev) {
2142                 err = -ENODEV;
2143                 goto done;
2144         }
2145         err = -EADDRNOTAVAIL;
2146
2147         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2148                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2149                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2150                         break;
2151         }
2152         if (!pmc)               /* must have a prior join */
2153                 goto done;
2154         msf->imsf_fmode = pmc->sfmode;
2155         psl = pmc->sflist;
2156         rtnl_unlock();
2157         if (!psl) {
2158                 len = 0;
2159                 count = 0;
2160         } else {
2161                 count = psl->sl_count;
2162         }
2163         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2164         len = copycount * sizeof(psl->sl_addr[0]);
2165         msf->imsf_numsrc = count;
2166         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2167             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2168                 return -EFAULT;
2169         }
2170         if (len &&
2171             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2172                 return -EFAULT;
2173         return 0;
2174 done:
2175         rtnl_unlock();
2176         return err;
2177 }
2178
2179 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2180         struct group_filter __user *optval, int __user *optlen)
2181 {
2182         int err, i, count, copycount;
2183         struct sockaddr_in *psin;
2184         __be32 addr;
2185         struct ip_mc_socklist *pmc;
2186         struct inet_sock *inet = inet_sk(sk);
2187         struct ip_sf_socklist *psl;
2188
2189         psin = (struct sockaddr_in *)&gsf->gf_group;
2190         if (psin->sin_family != AF_INET)
2191                 return -EINVAL;
2192         addr = psin->sin_addr.s_addr;
2193         if (!ipv4_is_multicast(addr))
2194                 return -EINVAL;
2195
2196         rtnl_lock();
2197
2198         err = -EADDRNOTAVAIL;
2199
2200         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2201                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2202                     pmc->multi.imr_ifindex == gsf->gf_interface)
2203                         break;
2204         }
2205         if (!pmc)               /* must have a prior join */
2206                 goto done;
2207         gsf->gf_fmode = pmc->sfmode;
2208         psl = pmc->sflist;
2209         rtnl_unlock();
2210         count = psl ? psl->sl_count : 0;
2211         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2212         gsf->gf_numsrc = count;
2213         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2214             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2215                 return -EFAULT;
2216         }
2217         for (i=0; i<copycount; i++) {
2218                 struct sockaddr_storage ss;
2219
2220                 psin = (struct sockaddr_in *)&ss;
2221                 memset(&ss, 0, sizeof(ss));
2222                 psin->sin_family = AF_INET;
2223                 psin->sin_addr.s_addr = psl->sl_addr[i];
2224                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2225                         return -EFAULT;
2226         }
2227         return 0;
2228 done:
2229         rtnl_unlock();
2230         return err;
2231 }
2232
2233 /*
2234  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2235  */
2236 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2237 {
2238         struct inet_sock *inet = inet_sk(sk);
2239         struct ip_mc_socklist *pmc;
2240         struct ip_sf_socklist *psl;
2241         int i;
2242         int ret;
2243
2244         ret = 1;
2245         if (!ipv4_is_multicast(loc_addr))
2246                 goto out;
2247
2248         rcu_read_lock();
2249         for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) {
2250                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2251                     pmc->multi.imr_ifindex == dif)
2252                         break;
2253         }
2254         ret = inet->mc_all;
2255         if (!pmc)
2256                 goto unlock;
2257         psl = pmc->sflist;
2258         ret = (pmc->sfmode == MCAST_EXCLUDE);
2259         if (!psl)
2260                 goto unlock;
2261
2262         for (i=0; i<psl->sl_count; i++) {
2263                 if (psl->sl_addr[i] == rmt_addr)
2264                         break;
2265         }
2266         ret = 0;
2267         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2268                 goto unlock;
2269         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2270                 goto unlock;
2271         ret = 1;
2272 unlock:
2273         rcu_read_unlock();
2274 out:
2275         return ret;
2276 }
2277
2278 /*
2279  *      A socket is closing.
2280  */
2281
2282 void ip_mc_drop_socket(struct sock *sk)
2283 {
2284         struct inet_sock *inet = inet_sk(sk);
2285         struct ip_mc_socklist *iml;
2286         struct net *net = sock_net(sk);
2287
2288         if (inet->mc_list == NULL)
2289                 return;
2290
2291         rtnl_lock();
2292         while ((iml = inet->mc_list) != NULL) {
2293                 struct in_device *in_dev;
2294                 rcu_assign_pointer(inet->mc_list, iml->next);
2295
2296                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2297                 (void) ip_mc_leave_src(sk, iml, in_dev);
2298                 if (in_dev != NULL) {
2299                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2300                         in_dev_put(in_dev);
2301                 }
2302                 /* decrease mem now to avoid the memleak warning */
2303                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2304                 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
2305         }
2306         rtnl_unlock();
2307 }
2308
2309 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2310 {
2311         struct ip_mc_list *im;
2312         struct ip_sf_list *psf;
2313         int rv = 0;
2314
2315         read_lock(&in_dev->mc_list_lock);
2316         for (im=in_dev->mc_list; im; im=im->next) {
2317                 if (im->multiaddr == mc_addr)
2318                         break;
2319         }
2320         if (im && proto == IPPROTO_IGMP) {
2321                 rv = 1;
2322         } else if (im) {
2323                 if (src_addr) {
2324                         for (psf=im->sources; psf; psf=psf->sf_next) {
2325                                 if (psf->sf_inaddr == src_addr)
2326                                         break;
2327                         }
2328                         if (psf)
2329                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2330                                         psf->sf_count[MCAST_EXCLUDE] !=
2331                                         im->sfcount[MCAST_EXCLUDE];
2332                         else
2333                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2334                 } else
2335                         rv = 1; /* unspecified source; tentatively allow */
2336         }
2337         read_unlock(&in_dev->mc_list_lock);
2338         return rv;
2339 }
2340
2341 #if defined(CONFIG_PROC_FS)
2342 struct igmp_mc_iter_state {
2343         struct seq_net_private p;
2344         struct net_device *dev;
2345         struct in_device *in_dev;
2346 };
2347
2348 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2349
2350 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2351 {
2352         struct net *net = seq_file_net(seq);
2353         struct ip_mc_list *im = NULL;
2354         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2355
2356         state->in_dev = NULL;
2357         for_each_netdev_rcu(net, state->dev) {
2358                 struct in_device *in_dev;
2359
2360                 in_dev = __in_dev_get_rcu(state->dev);
2361                 if (!in_dev)
2362                         continue;
2363                 read_lock(&in_dev->mc_list_lock);
2364                 im = in_dev->mc_list;
2365                 if (im) {
2366                         state->in_dev = in_dev;
2367                         break;
2368                 }
2369                 read_unlock(&in_dev->mc_list_lock);
2370         }
2371         return im;
2372 }
2373
2374 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2375 {
2376         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2377         im = im->next;
2378         while (!im) {
2379                 if (likely(state->in_dev != NULL))
2380                         read_unlock(&state->in_dev->mc_list_lock);
2381
2382                 state->dev = next_net_device_rcu(state->dev);
2383                 if (!state->dev) {
2384                         state->in_dev = NULL;
2385                         break;
2386                 }
2387                 state->in_dev = __in_dev_get_rcu(state->dev);
2388                 if (!state->in_dev)
2389                         continue;
2390                 read_lock(&state->in_dev->mc_list_lock);
2391                 im = state->in_dev->mc_list;
2392         }
2393         return im;
2394 }
2395
2396 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2397 {
2398         struct ip_mc_list *im = igmp_mc_get_first(seq);
2399         if (im)
2400                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2401                         --pos;
2402         return pos ? NULL : im;
2403 }
2404
2405 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2406         __acquires(rcu)
2407 {
2408         rcu_read_lock();
2409         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2410 }
2411
2412 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2413 {
2414         struct ip_mc_list *im;
2415         if (v == SEQ_START_TOKEN)
2416                 im = igmp_mc_get_first(seq);
2417         else
2418                 im = igmp_mc_get_next(seq, v);
2419         ++*pos;
2420         return im;
2421 }
2422
2423 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2424         __releases(rcu)
2425 {
2426         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2427         if (likely(state->in_dev != NULL)) {
2428                 read_unlock(&state->in_dev->mc_list_lock);
2429                 state->in_dev = NULL;
2430         }
2431         state->dev = NULL;
2432         rcu_read_unlock();
2433 }
2434
2435 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2436 {
2437         if (v == SEQ_START_TOKEN)
2438                 seq_puts(seq,
2439                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2440         else {
2441                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2442                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2443                 char   *querier;
2444 #ifdef CONFIG_IP_MULTICAST
2445                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2446                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2447                           "V3";
2448 #else
2449                 querier = "NONE";
2450 #endif
2451
2452                 if (state->in_dev->mc_list == im) {
2453                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2454                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2455                 }
2456
2457                 seq_printf(seq,
2458                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2459                            im->multiaddr, im->users,
2460                            im->tm_running, im->tm_running ?
2461                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2462                            im->reporter);
2463         }
2464         return 0;
2465 }
2466
2467 static const struct seq_operations igmp_mc_seq_ops = {
2468         .start  =       igmp_mc_seq_start,
2469         .next   =       igmp_mc_seq_next,
2470         .stop   =       igmp_mc_seq_stop,
2471         .show   =       igmp_mc_seq_show,
2472 };
2473
2474 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2475 {
2476         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2477                         sizeof(struct igmp_mc_iter_state));
2478 }
2479
2480 static const struct file_operations igmp_mc_seq_fops = {
2481         .owner          =       THIS_MODULE,
2482         .open           =       igmp_mc_seq_open,
2483         .read           =       seq_read,
2484         .llseek         =       seq_lseek,
2485         .release        =       seq_release_net,
2486 };
2487
2488 struct igmp_mcf_iter_state {
2489         struct seq_net_private p;
2490         struct net_device *dev;
2491         struct in_device *idev;
2492         struct ip_mc_list *im;
2493 };
2494
2495 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2496
2497 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2498 {
2499         struct net *net = seq_file_net(seq);
2500         struct ip_sf_list *psf = NULL;
2501         struct ip_mc_list *im = NULL;
2502         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2503
2504         state->idev = NULL;
2505         state->im = NULL;
2506         for_each_netdev_rcu(net, state->dev) {
2507                 struct in_device *idev;
2508                 idev = __in_dev_get_rcu(state->dev);
2509                 if (unlikely(idev == NULL))
2510                         continue;
2511                 read_lock(&idev->mc_list_lock);
2512                 im = idev->mc_list;
2513                 if (likely(im != NULL)) {
2514                         spin_lock_bh(&im->lock);
2515                         psf = im->sources;
2516                         if (likely(psf != NULL)) {
2517                                 state->im = im;
2518                                 state->idev = idev;
2519                                 break;
2520                         }
2521                         spin_unlock_bh(&im->lock);
2522                 }
2523                 read_unlock(&idev->mc_list_lock);
2524         }
2525         return psf;
2526 }
2527
2528 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2529 {
2530         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2531
2532         psf = psf->sf_next;
2533         while (!psf) {
2534                 spin_unlock_bh(&state->im->lock);
2535                 state->im = state->im->next;
2536                 while (!state->im) {
2537                         if (likely(state->idev != NULL))
2538                                 read_unlock(&state->idev->mc_list_lock);
2539
2540                         state->dev = next_net_device_rcu(state->dev);
2541                         if (!state->dev) {
2542                                 state->idev = NULL;
2543                                 goto out;
2544                         }
2545                         state->idev = __in_dev_get_rcu(state->dev);
2546                         if (!state->idev)
2547                                 continue;
2548                         read_lock(&state->idev->mc_list_lock);
2549                         state->im = state->idev->mc_list;
2550                 }
2551                 if (!state->im)
2552                         break;
2553                 spin_lock_bh(&state->im->lock);
2554                 psf = state->im->sources;
2555         }
2556 out:
2557         return psf;
2558 }
2559
2560 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2561 {
2562         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2563         if (psf)
2564                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2565                         --pos;
2566         return pos ? NULL : psf;
2567 }
2568
2569 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2570         __acquires(rcu)
2571 {
2572         rcu_read_lock();
2573         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2574 }
2575
2576 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2577 {
2578         struct ip_sf_list *psf;
2579         if (v == SEQ_START_TOKEN)
2580                 psf = igmp_mcf_get_first(seq);
2581         else
2582                 psf = igmp_mcf_get_next(seq, v);
2583         ++*pos;
2584         return psf;
2585 }
2586
2587 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2588         __releases(rcu)
2589 {
2590         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2591         if (likely(state->im != NULL)) {
2592                 spin_unlock_bh(&state->im->lock);
2593                 state->im = NULL;
2594         }
2595         if (likely(state->idev != NULL)) {
2596                 read_unlock(&state->idev->mc_list_lock);
2597                 state->idev = NULL;
2598         }
2599         state->dev = NULL;
2600         rcu_read_unlock();
2601 }
2602
2603 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2604 {
2605         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2606         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2607
2608         if (v == SEQ_START_TOKEN) {
2609                 seq_printf(seq,
2610                            "%3s %6s "
2611                            "%10s %10s %6s %6s\n", "Idx",
2612                            "Device", "MCA",
2613                            "SRC", "INC", "EXC");
2614         } else {
2615                 seq_printf(seq,
2616                            "%3d %6.6s 0x%08x "
2617                            "0x%08x %6lu %6lu\n",
2618                            state->dev->ifindex, state->dev->name,
2619                            ntohl(state->im->multiaddr),
2620                            ntohl(psf->sf_inaddr),
2621                            psf->sf_count[MCAST_INCLUDE],
2622                            psf->sf_count[MCAST_EXCLUDE]);
2623         }
2624         return 0;
2625 }
2626
2627 static const struct seq_operations igmp_mcf_seq_ops = {
2628         .start  =       igmp_mcf_seq_start,
2629         .next   =       igmp_mcf_seq_next,
2630         .stop   =       igmp_mcf_seq_stop,
2631         .show   =       igmp_mcf_seq_show,
2632 };
2633
2634 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2635 {
2636         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2637                         sizeof(struct igmp_mcf_iter_state));
2638 }
2639
2640 static const struct file_operations igmp_mcf_seq_fops = {
2641         .owner          =       THIS_MODULE,
2642         .open           =       igmp_mcf_seq_open,
2643         .read           =       seq_read,
2644         .llseek         =       seq_lseek,
2645         .release        =       seq_release_net,
2646 };
2647
2648 static int __net_init igmp_net_init(struct net *net)
2649 {
2650         struct proc_dir_entry *pde;
2651
2652         pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2653         if (!pde)
2654                 goto out_igmp;
2655         pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2656         if (!pde)
2657                 goto out_mcfilter;
2658         return 0;
2659
2660 out_mcfilter:
2661         proc_net_remove(net, "igmp");
2662 out_igmp:
2663         return -ENOMEM;
2664 }
2665
2666 static void __net_exit igmp_net_exit(struct net *net)
2667 {
2668         proc_net_remove(net, "mcfilter");
2669         proc_net_remove(net, "igmp");
2670 }
2671
2672 static struct pernet_operations igmp_net_ops = {
2673         .init = igmp_net_init,
2674         .exit = igmp_net_exit,
2675 };
2676
2677 int __init igmp_mc_proc_init(void)
2678 {
2679         return register_pernet_subsys(&igmp_net_ops);
2680 }
2681 #endif
2682
2683 EXPORT_SYMBOL(ip_mc_dec_group);
2684 EXPORT_SYMBOL(ip_mc_inc_group);
2685 EXPORT_SYMBOL(ip_mc_join_group);
2686 EXPORT_SYMBOL(ip_mc_rejoin_group);