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_rcu(im, rcu);
 157         }
 158 }
 159
 160 #define for_each_pmc_rcu(in_dev, pmc)                           \
 161         for (pmc = rcu_dereference(in_dev->mc_list);            \
 162              pmc != NULL;                                       \
 163              pmc = rcu_dereference(pmc->next_rcu))
 164
 165 #define for_each_pmc_rtnl(in_dev, pmc)                          \
 166         for (pmc = rtnl_dereference(in_dev->mc_list);           \
 167              pmc != NULL;                                       \
 168              pmc = rtnl_dereference(pmc->next_rcu))
 169
 170 #ifdef CONFIG_IP_MULTICAST
 171
 172 /*
 173  *      Timer management
 174  */
 175
 176 static void igmp_stop_timer(struct ip_mc_list *im)
 177 {
 178         spin_lock_bh(&im->lock);
 179         if (del_timer(&im->timer))
 180                 atomic_dec(&im->refcnt);
 181         im->tm_running = 0;
 182         im->reporter = 0;
 183         im->unsolicit_count = 0;
 184         spin_unlock_bh(&im->lock);
 185 }
 186
 187 /* It must be called with locked im->lock */
 188 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 189 {
 190         int tv = net_random() % max_delay;
 191
 192         im->tm_running = 1;
 193         if (!mod_timer(&im->timer, jiffies+tv+2))
 194                 atomic_inc(&im->refcnt);
 195 }
 196
 197 static void igmp_gq_start_timer(struct in_device *in_dev)
 198 {
 199         int tv = net_random() % in_dev->mr_maxdelay;
 200
 201         in_dev->mr_gq_running = 1;
 202         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 203                 in_dev_hold(in_dev);
 204 }
 205
 206 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 207 {
 208         int tv = net_random() % delay;
 209
 210         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 211                 in_dev_hold(in_dev);
 212 }
 213
 214 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 215 {
 216         spin_lock_bh(&im->lock);
 217         im->unsolicit_count = 0;
 218         if (del_timer(&im->timer)) {
 219                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 220                         add_timer(&im->timer);
 221                         im->tm_running = 1;
 222                         spin_unlock_bh(&im->lock);
 223                         return;
 224                 }
 225                 atomic_dec(&im->refcnt);
 226         }
 227         igmp_start_timer(im, max_delay);
 228         spin_unlock_bh(&im->lock);
 229 }
 230
 231
 232 /*
 233  *      Send an IGMP report.
 234  */
 235
 236 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 237
 238
 239 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 240         int gdeleted, int sdeleted)
 241 {
 242         switch (type) {
 243         case IGMPV3_MODE_IS_INCLUDE:
 244         case IGMPV3_MODE_IS_EXCLUDE:
 245                 if (gdeleted || sdeleted)
 246                         return 0;
 247                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 248                         if (pmc->sfmode == MCAST_INCLUDE)
 249                                 return 1;
 250                         /* don't include if this source is excluded
 251                          * in all filters
 252                          */
 253                         if (psf->sf_count[MCAST_INCLUDE])
 254                                 return type == IGMPV3_MODE_IS_INCLUDE;
 255                         return pmc->sfcount[MCAST_EXCLUDE] ==
 256                                 psf->sf_count[MCAST_EXCLUDE];
 257                 }
 258                 return 0;
 259         case IGMPV3_CHANGE_TO_INCLUDE:
 260                 if (gdeleted || sdeleted)
 261                         return 0;
 262                 return psf->sf_count[MCAST_INCLUDE] != 0;
 263         case IGMPV3_CHANGE_TO_EXCLUDE:
 264                 if (gdeleted || sdeleted)
 265                         return 0;
 266                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 267                     psf->sf_count[MCAST_INCLUDE])
 268                         return 0;
 269                 return pmc->sfcount[MCAST_EXCLUDE] ==
 270                         psf->sf_count[MCAST_EXCLUDE];
 271         case IGMPV3_ALLOW_NEW_SOURCES:
 272                 if (gdeleted || !psf->sf_crcount)
 273                         return 0;
 274                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 275         case IGMPV3_BLOCK_OLD_SOURCES:
 276                 if (pmc->sfmode == MCAST_INCLUDE)
 277                         return gdeleted || (psf->sf_crcount && sdeleted);
 278                 return psf->sf_crcount && !gdeleted && !sdeleted;
 279         }
 280         return 0;
 281 }
 282
 283 static int
 284 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 285 {
 286         struct ip_sf_list *psf;
 287         int scount = 0;
 288
 289         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 290                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 291                         continue;
 292                 scount++;
 293         }
 294         return scount;
 295 }
 296
 297 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
 298
 299 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 300 {
 301         struct sk_buff *skb;
 302         struct rtable *rt;
 303         struct iphdr *pip;
 304         struct igmpv3_report *pig;
 305         struct net *net = dev_net(dev);
 306         struct flowi4 fl4;
 307         int hlen = LL_RESERVED_SPACE(dev);
 308         int tlen = dev->needed_tailroom;
 309
 310         while (1) {
 311                 skb = alloc_skb(size + hlen + tlen,
 312                                 GFP_ATOMIC | __GFP_NOWARN);
 313                 if (skb)
 314                         break;
 315                 size >>= 1;
 316                 if (size < 256)
 317                         return NULL;
 318         }
 319         igmp_skb_size(skb) = size;
 320
 321         rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
 322                                    0, 0,
 323                                    IPPROTO_IGMP, 0, dev->ifindex);
 324         if (IS_ERR(rt)) {
 325                 kfree_skb(skb);
 326                 return NULL;
 327         }
 328
 329         skb_dst_set(skb, &rt->dst);
 330         skb->dev = dev;
 331
 332         skb_reserve(skb, hlen);
 333
 334         skb_reset_network_header(skb);
 335         pip = ip_hdr(skb);
 336         skb_put(skb, sizeof(struct iphdr) + 4);
 337
 338         pip->version  = 4;
 339         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 340         pip->tos      = 0xc0;
 341         pip->frag_off = htons(IP_DF);
 342         pip->ttl      = 1;
 343         pip->daddr    = fl4.daddr;
 344         pip->saddr    = fl4.saddr;
 345         pip->protocol = IPPROTO_IGMP;
 346         pip->tot_len  = 0;      /* filled in later */
 347         ip_select_ident(skb, NULL);
 348         ((u8*)&pip[1])[0] = IPOPT_RA;
 349         ((u8*)&pip[1])[1] = 4;
 350         ((u8*)&pip[1])[2] = 0;
 351         ((u8*)&pip[1])[3] = 0;
 352
 353         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 354         skb_put(skb, sizeof(*pig));
 355         pig = igmpv3_report_hdr(skb);
 356         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 357         pig->resv1 = 0;
 358         pig->csum = 0;
 359         pig->resv2 = 0;
 360         pig->ngrec = 0;
 361         return skb;
 362 }
 363
 364 static int igmpv3_sendpack(struct sk_buff *skb)
 365 {
 366         struct igmphdr *pig = igmp_hdr(skb);
 367         const int igmplen = skb->tail - skb->transport_header;
 368
 369         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 370
 371         return ip_local_out(skb);
 372 }
 373
 374 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 375 {
 376         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
 377 }
 378
 379 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 380         int type, struct igmpv3_grec **ppgr)
 381 {
 382         struct net_device *dev = pmc->interface->dev;
 383         struct igmpv3_report *pih;
 384         struct igmpv3_grec *pgr;
 385
 386         if (!skb)
 387                 skb = igmpv3_newpack(dev, dev->mtu);
 388         if (!skb)
 389                 return NULL;
 390         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 391         pgr->grec_type = type;
 392         pgr->grec_auxwords = 0;
 393         pgr->grec_nsrcs = 0;
 394         pgr->grec_mca = pmc->multiaddr;
 395         pih = igmpv3_report_hdr(skb);
 396         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 397         *ppgr = pgr;
 398         return skb;
 399 }
 400
 401 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
 402         skb_tailroom(skb)) : 0)
 403
 404 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 405         int type, int gdeleted, int sdeleted)
 406 {
 407         struct net_device *dev = pmc->interface->dev;
 408         struct igmpv3_report *pih;
 409         struct igmpv3_grec *pgr = NULL;
 410         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 411         int scount, stotal, first, isquery, truncate;
 412
 413         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 414                 return skb;
 415
 416         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 417                   type == IGMPV3_MODE_IS_EXCLUDE;
 418         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 419                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 420
 421         stotal = scount = 0;
 422
 423         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 424
 425         if (!*psf_list)
 426                 goto empty_source;
 427
 428         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 429
 430         /* EX and TO_EX get a fresh packet, if needed */
 431         if (truncate) {
 432                 if (pih && pih->ngrec &&
 433                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 434                         if (skb)
 435                                 igmpv3_sendpack(skb);
 436                         skb = igmpv3_newpack(dev, dev->mtu);
 437                 }
 438         }
 439         first = 1;
 440         psf_prev = NULL;
 441         for (psf=*psf_list; psf; psf=psf_next) {
 442                 __be32 *psrc;
 443
 444                 psf_next = psf->sf_next;
 445
 446                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 447                         psf_prev = psf;
 448                         continue;
 449                 }
 450
 451                 /* clear marks on query responses */
 452                 if (isquery)
 453                         psf->sf_gsresp = 0;
 454
 455                 if (AVAILABLE(skb) < sizeof(__be32) +
 456                     first*sizeof(struct igmpv3_grec)) {
 457                         if (truncate && !first)
 458                                 break;   /* truncate these */
 459                         if (pgr)
 460                                 pgr->grec_nsrcs = htons(scount);
 461                         if (skb)
 462                                 igmpv3_sendpack(skb);
 463                         skb = igmpv3_newpack(dev, dev->mtu);
 464                         first = 1;
 465                         scount = 0;
 466                 }
 467                 if (first) {
 468                         skb = add_grhead(skb, pmc, type, &pgr);
 469                         first = 0;
 470                 }
 471                 if (!skb)
 472                         return NULL;
 473                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 474                 *psrc = psf->sf_inaddr;
 475                 scount++; stotal++;
 476                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 477                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 478                         psf->sf_crcount--;
 479                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 480                                 if (psf_prev)
 481                                         psf_prev->sf_next = psf->sf_next;
 482                                 else
 483                                         *psf_list = psf->sf_next;
 484                                 kfree(psf);
 485                                 continue;
 486                         }
 487                 }
 488                 psf_prev = psf;
 489         }
 490
 491 empty_source:
 492         if (!stotal) {
 493                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 494                     type == IGMPV3_BLOCK_OLD_SOURCES)
 495                         return skb;
 496                 if (pmc->crcount || isquery) {
 497                         /* make sure we have room for group header */
 498                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 499                                 igmpv3_sendpack(skb);
 500                                 skb = NULL; /* add_grhead will get a new one */
 501                         }
 502                         skb = add_grhead(skb, pmc, type, &pgr);
 503                 }
 504         }
 505         if (pgr)
 506                 pgr->grec_nsrcs = htons(scount);
 507
 508         if (isquery)
 509                 pmc->gsquery = 0;       /* clear query state on report */
 510         return skb;
 511 }
 512
 513 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 514 {
 515         struct sk_buff *skb = NULL;
 516         int type;
 517
 518         if (!pmc) {
 519                 rcu_read_lock();
 520                 for_each_pmc_rcu(in_dev, pmc) {
 521                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 522                                 continue;
 523                         spin_lock_bh(&pmc->lock);
 524                         if (pmc->sfcount[MCAST_EXCLUDE])
 525                                 type = IGMPV3_MODE_IS_EXCLUDE;
 526                         else
 527                                 type = IGMPV3_MODE_IS_INCLUDE;
 528                         skb = add_grec(skb, pmc, type, 0, 0);
 529                         spin_unlock_bh(&pmc->lock);
 530                 }
 531                 rcu_read_unlock();
 532         } else {
 533                 spin_lock_bh(&pmc->lock);
 534                 if (pmc->sfcount[MCAST_EXCLUDE])
 535                         type = IGMPV3_MODE_IS_EXCLUDE;
 536                 else
 537                         type = IGMPV3_MODE_IS_INCLUDE;
 538                 skb = add_grec(skb, pmc, type, 0, 0);
 539                 spin_unlock_bh(&pmc->lock);
 540         }
 541         if (!skb)
 542                 return 0;
 543         return igmpv3_sendpack(skb);
 544 }
 545
 546 /*
 547  * remove zero-count source records from a source filter list
 548  */
 549 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 550 {
 551         struct ip_sf_list *psf_prev, *psf_next, *psf;
 552
 553         psf_prev = NULL;
 554         for (psf=*ppsf; psf; psf = psf_next) {
 555                 psf_next = psf->sf_next;
 556                 if (psf->sf_crcount == 0) {
 557                         if (psf_prev)
 558                                 psf_prev->sf_next = psf->sf_next;
 559                         else
 560                                 *ppsf = psf->sf_next;
 561                         kfree(psf);
 562                 } else
 563                         psf_prev = psf;
 564         }
 565 }
 566
 567 static void igmpv3_send_cr(struct in_device *in_dev)
 568 {
 569         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 570         struct sk_buff *skb = NULL;
 571         int type, dtype;
 572
 573         rcu_read_lock();
 574         spin_lock_bh(&in_dev->mc_tomb_lock);
 575
 576         /* deleted MCA's */
 577         pmc_prev = NULL;
 578         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 579                 pmc_next = pmc->next;
 580                 if (pmc->sfmode == MCAST_INCLUDE) {
 581                         type = IGMPV3_BLOCK_OLD_SOURCES;
 582                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 583                         skb = add_grec(skb, pmc, type, 1, 0);
 584                         skb = add_grec(skb, pmc, dtype, 1, 1);
 585                 }
 586                 if (pmc->crcount) {
 587                         if (pmc->sfmode == MCAST_EXCLUDE) {
 588                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 589                                 skb = add_grec(skb, pmc, type, 1, 0);
 590                         }
 591                         pmc->crcount--;
 592                         if (pmc->crcount == 0) {
 593                                 igmpv3_clear_zeros(&pmc->tomb);
 594                                 igmpv3_clear_zeros(&pmc->sources);
 595                         }
 596                 }
 597                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 598                         if (pmc_prev)
 599                                 pmc_prev->next = pmc_next;
 600                         else
 601                                 in_dev->mc_tomb = pmc_next;
 602                         in_dev_put(pmc->interface);
 603                         kfree(pmc);
 604                 } else
 605                         pmc_prev = pmc;
 606         }
 607         spin_unlock_bh(&in_dev->mc_tomb_lock);
 608
 609         /* change recs */
 610         for_each_pmc_rcu(in_dev, pmc) {
 611                 spin_lock_bh(&pmc->lock);
 612                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 613                         type = IGMPV3_BLOCK_OLD_SOURCES;
 614                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 615                 } else {
 616                         type = IGMPV3_ALLOW_NEW_SOURCES;
 617                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 618                 }
 619                 skb = add_grec(skb, pmc, type, 0, 0);
 620                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 621
 622                 /* filter mode changes */
 623                 if (pmc->crcount) {
 624                         if (pmc->sfmode == MCAST_EXCLUDE)
 625                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 626                         else
 627                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 628                         skb = add_grec(skb, pmc, type, 0, 0);
 629                         pmc->crcount--;
 630                 }
 631                 spin_unlock_bh(&pmc->lock);
 632         }
 633         rcu_read_unlock();
 634
 635         if (!skb)
 636                 return;
 637         (void) igmpv3_sendpack(skb);
 638 }
 639
 640 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 641         int type)
 642 {
 643         struct sk_buff *skb;
 644         struct iphdr *iph;
 645         struct igmphdr *ih;
 646         struct rtable *rt;
 647         struct net_device *dev = in_dev->dev;
 648         struct net *net = dev_net(dev);
 649         __be32  group = pmc ? pmc->multiaddr : 0;
 650         struct flowi4 fl4;
 651         __be32  dst;
 652         int hlen, tlen;
 653
 654         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 655                 return igmpv3_send_report(in_dev, pmc);
 656         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 657                 dst = IGMP_ALL_ROUTER;
 658         else
 659                 dst = group;
 660
 661         rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
 662                                    0, 0,
 663                                    IPPROTO_IGMP, 0, dev->ifindex);
 664         if (IS_ERR(rt))
 665                 return -1;
 666
 667         hlen = LL_RESERVED_SPACE(dev);
 668         tlen = dev->needed_tailroom;
 669         skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
 670         if (skb == NULL) {
 671                 ip_rt_put(rt);
 672                 return -1;
 673         }
 674
 675         skb_dst_set(skb, &rt->dst);
 676
 677         skb_reserve(skb, hlen);
 678
 679         skb_reset_network_header(skb);
 680         iph = ip_hdr(skb);
 681         skb_put(skb, sizeof(struct iphdr) + 4);
 682
 683         iph->version  = 4;
 684         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 685         iph->tos      = 0xc0;
 686         iph->frag_off = htons(IP_DF);
 687         iph->ttl      = 1;
 688         iph->daddr    = dst;
 689         iph->saddr    = fl4.saddr;
 690         iph->protocol = IPPROTO_IGMP;
 691         ip_select_ident(skb, NULL);
 692         ((u8*)&iph[1])[0] = IPOPT_RA;
 693         ((u8*)&iph[1])[1] = 4;
 694         ((u8*)&iph[1])[2] = 0;
 695         ((u8*)&iph[1])[3] = 0;
 696
 697         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 698         ih->type = type;
 699         ih->code = 0;
 700         ih->csum = 0;
 701         ih->group = group;
 702         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 703
 704         return ip_local_out(skb);
 705 }
 706
 707 static void igmp_gq_timer_expire(unsigned long data)
 708 {
 709         struct in_device *in_dev = (struct in_device *)data;
 710
 711         in_dev->mr_gq_running = 0;
 712         igmpv3_send_report(in_dev, NULL);
 713         in_dev_put(in_dev);
 714 }
 715
 716 static void igmp_ifc_timer_expire(unsigned long data)
 717 {
 718         struct in_device *in_dev = (struct in_device *)data;
 719
 720         igmpv3_send_cr(in_dev);
 721         if (in_dev->mr_ifc_count) {
 722                 in_dev->mr_ifc_count--;
 723                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 724         }
 725         in_dev_put(in_dev);
 726 }
 727
 728 static void igmp_ifc_event(struct in_device *in_dev)
 729 {
 730         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 731                 return;
 732         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 733                 IGMP_Unsolicited_Report_Count;
 734         igmp_ifc_start_timer(in_dev, 1);
 735 }
 736
 737
 738 static void igmp_timer_expire(unsigned long data)
 739 {
 740         struct ip_mc_list *im=(struct ip_mc_list *)data;
 741         struct in_device *in_dev = im->interface;
 742
 743         spin_lock(&im->lock);
 744         im->tm_running = 0;
 745
 746         if (im->unsolicit_count) {
 747                 im->unsolicit_count--;
 748                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 749         }
 750         im->reporter = 1;
 751         spin_unlock(&im->lock);
 752
 753         if (IGMP_V1_SEEN(in_dev))
 754                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 755         else if (IGMP_V2_SEEN(in_dev))
 756                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 757         else
 758                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 759
 760         ip_ma_put(im);
 761 }
 762
 763 /* mark EXCLUDE-mode sources */
 764 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 765 {
 766         struct ip_sf_list *psf;
 767         int i, scount;
 768
 769         scount = 0;
 770         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 771                 if (scount == nsrcs)
 772                         break;
 773                 for (i=0; i<nsrcs; i++) {
 774                         /* skip inactive filters */
 775                         if (psf->sf_count[MCAST_INCLUDE] ||
 776                             pmc->sfcount[MCAST_EXCLUDE] !=
 777                             psf->sf_count[MCAST_EXCLUDE])
 778                                 continue;
 779                         if (srcs[i] == psf->sf_inaddr) {
 780                                 scount++;
 781                                 break;
 782                         }
 783                 }
 784         }
 785         pmc->gsquery = 0;
 786         if (scount == nsrcs)    /* all sources excluded */
 787                 return 0;
 788         return 1;
 789 }
 790
 791 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 792 {
 793         struct ip_sf_list *psf;
 794         int i, scount;
 795
 796         if (pmc->sfmode == MCAST_EXCLUDE)
 797                 return igmp_xmarksources(pmc, nsrcs, srcs);
 798
 799         /* mark INCLUDE-mode sources */
 800         scount = 0;
 801         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 802                 if (scount == nsrcs)
 803                         break;
 804                 for (i=0; i<nsrcs; i++)
 805                         if (srcs[i] == psf->sf_inaddr) {
 806                                 psf->sf_gsresp = 1;
 807                                 scount++;
 808                                 break;
 809                         }
 810         }
 811         if (!scount) {
 812                 pmc->gsquery = 0;
 813                 return 0;
 814         }
 815         pmc->gsquery = 1;
 816         return 1;
 817 }
 818
 819 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 820 {
 821         struct ip_mc_list *im;
 822
 823         /* Timers are only set for non-local groups */
 824
 825         if (group == IGMP_ALL_HOSTS)
 826                 return;
 827
 828         rcu_read_lock();
 829         for_each_pmc_rcu(in_dev, im) {
 830                 if (im->multiaddr == group) {
 831                         igmp_stop_timer(im);
 832                         break;
 833                 }
 834         }
 835         rcu_read_unlock();
 836 }
 837
 838 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 839         int len)
 840 {
 841         struct igmphdr          *ih = igmp_hdr(skb);
 842         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 843         struct ip_mc_list       *im;
 844         __be32                  group = ih->group;
 845         int                     max_delay;
 846         int                     mark = 0;
 847
 848
 849         if (len == 8) {
 850                 if (ih->code == 0) {
 851                         /* Alas, old v1 router presents here. */
 852
 853                         max_delay = IGMP_Query_Response_Interval;
 854                         in_dev->mr_v1_seen = jiffies +
 855                                 IGMP_V1_Router_Present_Timeout;
 856                         group = 0;
 857                 } else {
 858                         /* v2 router present */
 859                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 860                         in_dev->mr_v2_seen = jiffies +
 861                                 IGMP_V2_Router_Present_Timeout;
 862                 }
 863                 /* cancel the interface change timer */
 864                 in_dev->mr_ifc_count = 0;
 865                 if (del_timer(&in_dev->mr_ifc_timer))
 866                         __in_dev_put(in_dev);
 867                 /* clear deleted report items */
 868                 igmpv3_clear_delrec(in_dev);
 869         } else if (len < 12) {
 870                 return; /* ignore bogus packet; freed by caller */
 871         } else if (IGMP_V1_SEEN(in_dev)) {
 872                 /* This is a v3 query with v1 queriers present */
 873                 max_delay = IGMP_Query_Response_Interval;
 874                 group = 0;
 875         } else if (IGMP_V2_SEEN(in_dev)) {
 876                 /* this is a v3 query with v2 queriers present;
 877                  * Interpretation of the max_delay code is problematic here.
 878                  * A real v2 host would use ih_code directly, while v3 has a
 879                  * different encoding. We use the v3 encoding as more likely
 880                  * to be intended in a v3 query.
 881                  */
 882                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 883                 if (!max_delay)
 884                         max_delay = 1;  /* can't mod w/ 0 */
 885         } else { /* v3 */
 886                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 887                         return;
 888
 889                 ih3 = igmpv3_query_hdr(skb);
 890                 if (ih3->nsrcs) {
 891                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 892                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 893                                 return;
 894                         ih3 = igmpv3_query_hdr(skb);
 895                 }
 896
 897                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 898                 if (!max_delay)
 899                         max_delay = 1;  /* can't mod w/ 0 */
 900                 in_dev->mr_maxdelay = max_delay;
 901                 if (ih3->qrv)
 902                         in_dev->mr_qrv = ih3->qrv;
 903                 if (!group) { /* general query */
 904                         if (ih3->nsrcs)
 905                                 return; /* no sources allowed */
 906                         igmp_gq_start_timer(in_dev);
 907                         return;
 908                 }
 909                 /* mark sources to include, if group & source-specific */
 910                 mark = ih3->nsrcs != 0;
 911         }
 912
 913         /*
 914          * - Start the timers in all of our membership records
 915          *   that the query applies to for the interface on
 916          *   which the query arrived excl. those that belong
 917          *   to a "local" group (224.0.0.X)
 918          * - For timers already running check if they need to
 919          *   be reset.
 920          * - Use the igmp->igmp_code field as the maximum
 921          *   delay possible
 922          */
 923         rcu_read_lock();
 924         for_each_pmc_rcu(in_dev, im) {
 925                 int changed;
 926
 927                 if (group && group != im->multiaddr)
 928                         continue;
 929                 if (im->multiaddr == IGMP_ALL_HOSTS)
 930                         continue;
 931                 spin_lock_bh(&im->lock);
 932                 if (im->tm_running)
 933                         im->gsquery = im->gsquery && mark;
 934                 else
 935                         im->gsquery = mark;
 936                 changed = !im->gsquery ||
 937                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 938                 spin_unlock_bh(&im->lock);
 939                 if (changed)
 940                         igmp_mod_timer(im, max_delay);
 941         }
 942         rcu_read_unlock();
 943 }
 944
 945 /* called in rcu_read_lock() section */
 946 int igmp_rcv(struct sk_buff *skb)
 947 {
 948         /* This basically follows the spec line by line -- see RFC1112 */
 949         struct igmphdr *ih;
 950         struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
 951         int len = skb->len;
 952
 953         if (in_dev == NULL)
 954                 goto drop;
 955
 956         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 957                 goto drop;
 958
 959         switch (skb->ip_summed) {
 960         case CHECKSUM_COMPLETE:
 961                 if (!csum_fold(skb->csum))
 962                         break;
 963                 /* fall through */
 964         case CHECKSUM_NONE:
 965                 skb->csum = 0;
 966                 if (__skb_checksum_complete(skb))
 967                         goto drop;
 968         }
 969
 970         ih = igmp_hdr(skb);
 971         switch (ih->type) {
 972         case IGMP_HOST_MEMBERSHIP_QUERY:
 973                 igmp_heard_query(in_dev, skb, len);
 974                 break;
 975         case IGMP_HOST_MEMBERSHIP_REPORT:
 976         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 977                 /* Is it our report looped back? */
 978                 if (rt_is_output_route(skb_rtable(skb)))
 979                         break;
 980                 /* don't rely on MC router hearing unicast reports */
 981                 if (skb->pkt_type == PACKET_MULTICAST ||
 982                     skb->pkt_type == PACKET_BROADCAST)
 983                         igmp_heard_report(in_dev, ih->group);
 984                 break;
 985         case IGMP_PIM:
 986 #ifdef CONFIG_IP_PIMSM_V1
 987                 return pim_rcv_v1(skb);
 988 #endif
 989         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 990         case IGMP_DVMRP:
 991         case IGMP_TRACE:
 992         case IGMP_HOST_LEAVE_MESSAGE:
 993         case IGMP_MTRACE:
 994         case IGMP_MTRACE_RESP:
 995                 break;
 996         default:
 997                 break;
 998         }
 999
1000 drop:
1001         kfree_skb(skb);
1002         return 0;
1003 }
1004
1005 #endif
1006
1007
1008 /*
1009  *      Add a filter to a device
1010  */
1011
1012 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1013 {
1014         char buf[MAX_ADDR_LEN];
1015         struct net_device *dev = in_dev->dev;
1016
1017         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1018            We will get multicast token leakage, when IFF_MULTICAST
1019            is changed. This check should be done in ndo_set_rx_mode
1020            routine. Something sort of:
1021            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1022            --ANK
1023            */
1024         if (arp_mc_map(addr, buf, dev, 0) == 0)
1025                 dev_mc_add(dev, buf);
1026 }
1027
1028 /*
1029  *      Remove a filter from a device
1030  */
1031
1032 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1033 {
1034         char buf[MAX_ADDR_LEN];
1035         struct net_device *dev = in_dev->dev;
1036
1037         if (arp_mc_map(addr, buf, dev, 0) == 0)
1038                 dev_mc_del(dev, buf);
1039 }
1040
1041 #ifdef CONFIG_IP_MULTICAST
1042 /*
1043  * deleted ip_mc_list manipulation
1044  */
1045 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1046 {
1047         struct ip_mc_list *pmc;
1048
1049         /* this is an "ip_mc_list" for convenience; only the fields below
1050          * are actually used. In particular, the refcnt and users are not
1051          * used for management of the delete list. Using the same structure
1052          * for deleted items allows change reports to use common code with
1053          * non-deleted or query-response MCA's.
1054          */
1055         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1056         if (!pmc)
1057                 return;
1058         spin_lock_bh(&im->lock);
1059         pmc->interface = im->interface;
1060         in_dev_hold(in_dev);
1061         pmc->multiaddr = im->multiaddr;
1062         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1063                 IGMP_Unsolicited_Report_Count;
1064         pmc->sfmode = im->sfmode;
1065         if (pmc->sfmode == MCAST_INCLUDE) {
1066                 struct ip_sf_list *psf;
1067
1068                 pmc->tomb = im->tomb;
1069                 pmc->sources = im->sources;
1070                 im->tomb = im->sources = NULL;
1071                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1072                         psf->sf_crcount = pmc->crcount;
1073         }
1074         spin_unlock_bh(&im->lock);
1075
1076         spin_lock_bh(&in_dev->mc_tomb_lock);
1077         pmc->next = in_dev->mc_tomb;
1078         in_dev->mc_tomb = pmc;
1079         spin_unlock_bh(&in_dev->mc_tomb_lock);
1080 }
1081
1082 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1083 {
1084         struct ip_mc_list *pmc, *pmc_prev;
1085         struct ip_sf_list *psf, *psf_next;
1086
1087         spin_lock_bh(&in_dev->mc_tomb_lock);
1088         pmc_prev = NULL;
1089         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1090                 if (pmc->multiaddr == multiaddr)
1091                         break;
1092                 pmc_prev = pmc;
1093         }
1094         if (pmc) {
1095                 if (pmc_prev)
1096                         pmc_prev->next = pmc->next;
1097                 else
1098                         in_dev->mc_tomb = pmc->next;
1099         }
1100         spin_unlock_bh(&in_dev->mc_tomb_lock);
1101         if (pmc) {
1102                 for (psf=pmc->tomb; psf; psf=psf_next) {
1103                         psf_next = psf->sf_next;
1104                         kfree(psf);
1105                 }
1106                 in_dev_put(pmc->interface);
1107                 kfree(pmc);
1108         }
1109 }
1110
1111 static void igmpv3_clear_delrec(struct in_device *in_dev)
1112 {
1113         struct ip_mc_list *pmc, *nextpmc;
1114
1115         spin_lock_bh(&in_dev->mc_tomb_lock);
1116         pmc = in_dev->mc_tomb;
1117         in_dev->mc_tomb = NULL;
1118         spin_unlock_bh(&in_dev->mc_tomb_lock);
1119
1120         for (; pmc; pmc = nextpmc) {
1121                 nextpmc = pmc->next;
1122                 ip_mc_clear_src(pmc);
1123                 in_dev_put(pmc->interface);
1124                 kfree(pmc);
1125         }
1126         /* clear dead sources, too */
1127         rcu_read_lock();
1128         for_each_pmc_rcu(in_dev, pmc) {
1129                 struct ip_sf_list *psf, *psf_next;
1130
1131                 spin_lock_bh(&pmc->lock);
1132                 psf = pmc->tomb;
1133                 pmc->tomb = NULL;
1134                 spin_unlock_bh(&pmc->lock);
1135                 for (; psf; psf=psf_next) {
1136                         psf_next = psf->sf_next;
1137                         kfree(psf);
1138                 }
1139         }
1140         rcu_read_unlock();
1141 }
1142 #endif
1143
1144 static void igmp_group_dropped(struct ip_mc_list *im)
1145 {
1146         struct in_device *in_dev = im->interface;
1147 #ifdef CONFIG_IP_MULTICAST
1148         int reporter;
1149 #endif
1150
1151         if (im->loaded) {
1152                 im->loaded = 0;
1153                 ip_mc_filter_del(in_dev, im->multiaddr);
1154         }
1155
1156 #ifdef CONFIG_IP_MULTICAST
1157         if (im->multiaddr == IGMP_ALL_HOSTS)
1158                 return;
1159
1160         reporter = im->reporter;
1161         igmp_stop_timer(im);
1162
1163         if (!in_dev->dead) {
1164                 if (IGMP_V1_SEEN(in_dev))
1165                         return;
1166                 if (IGMP_V2_SEEN(in_dev)) {
1167                         if (reporter)
1168                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1169                         return;
1170                 }
1171                 /* IGMPv3 */
1172                 igmpv3_add_delrec(in_dev, im);
1173
1174                 igmp_ifc_event(in_dev);
1175         }
1176 #endif
1177 }
1178
1179 static void igmp_group_added(struct ip_mc_list *im)
1180 {
1181         struct in_device *in_dev = im->interface;
1182
1183         if (im->loaded == 0) {
1184                 im->loaded = 1;
1185                 ip_mc_filter_add(in_dev, im->multiaddr);
1186         }
1187
1188 #ifdef CONFIG_IP_MULTICAST
1189         if (im->multiaddr == IGMP_ALL_HOSTS)
1190                 return;
1191
1192         if (in_dev->dead)
1193                 return;
1194         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1195                 spin_lock_bh(&im->lock);
1196                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1197                 spin_unlock_bh(&im->lock);
1198                 return;
1199         }
1200         /* else, v3 */
1201
1202         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1203                 IGMP_Unsolicited_Report_Count;
1204         igmp_ifc_event(in_dev);
1205 #endif
1206 }
1207
1208
1209 /*
1210  *      Multicast list managers
1211  */
1212
1213
1214 /*
1215  *      A socket has joined a multicast group on device dev.
1216  */
1217
1218 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1219 {
1220         struct ip_mc_list *im;
1221
1222         ASSERT_RTNL();
1223
1224         for_each_pmc_rtnl(in_dev, im) {
1225                 if (im->multiaddr == addr) {
1226                         im->users++;
1227                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1228                         goto out;
1229                 }
1230         }
1231
1232         im = kzalloc(sizeof(*im), GFP_KERNEL);
1233         if (!im)
1234                 goto out;
1235
1236         im->users = 1;
1237         im->interface = in_dev;
1238         in_dev_hold(in_dev);
1239         im->multiaddr = addr;
1240         /* initial mode is (EX, empty) */
1241         im->sfmode = MCAST_EXCLUDE;
1242         im->sfcount[MCAST_EXCLUDE] = 1;
1243         atomic_set(&im->refcnt, 1);
1244         spin_lock_init(&im->lock);
1245 #ifdef CONFIG_IP_MULTICAST
1246         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1247         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1248 #endif
1249
1250         im->next_rcu = in_dev->mc_list;
1251         in_dev->mc_count++;
1252         rcu_assign_pointer(in_dev->mc_list, im);
1253
1254 #ifdef CONFIG_IP_MULTICAST
1255         igmpv3_del_delrec(in_dev, im->multiaddr);
1256 #endif
1257         igmp_group_added(im);
1258         if (!in_dev->dead)
1259                 ip_rt_multicast_event(in_dev);
1260 out:
1261         return;
1262 }
1263 EXPORT_SYMBOL(ip_mc_inc_group);
1264
1265 /*
1266  *      Resend IGMP JOIN report; used for bonding.
1267  *      Called with rcu_read_lock()
1268  */
1269 void ip_mc_rejoin_groups(struct in_device *in_dev)
1270 {
1271 #ifdef CONFIG_IP_MULTICAST
1272         struct ip_mc_list *im;
1273         int type;
1274
1275         for_each_pmc_rcu(in_dev, im) {
1276                 if (im->multiaddr == IGMP_ALL_HOSTS)
1277                         continue;
1278
1279                 /* a failover is happening and switches
1280                  * must be notified immediately
1281                  */
1282                 if (IGMP_V1_SEEN(in_dev))
1283                         type = IGMP_HOST_MEMBERSHIP_REPORT;
1284                 else if (IGMP_V2_SEEN(in_dev))
1285                         type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1286                 else
1287                         type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1288                 igmp_send_report(in_dev, im, type);
1289         }
1290 #endif
1291 }
1292 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1293
1294 /*
1295  *      A socket has left a multicast group on device dev
1296  */
1297
1298 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1299 {
1300         struct ip_mc_list *i;
1301         struct ip_mc_list __rcu **ip;
1302
1303         ASSERT_RTNL();
1304
1305         for (ip = &in_dev->mc_list;
1306              (i = rtnl_dereference(*ip)) != NULL;
1307              ip = &i->next_rcu) {
1308                 if (i->multiaddr == addr) {
1309                         if (--i->users == 0) {
1310                                 *ip = i->next_rcu;
1311                                 in_dev->mc_count--;
1312                                 igmp_group_dropped(i);
1313                                 ip_mc_clear_src(i);
1314
1315                                 if (!in_dev->dead)
1316                                         ip_rt_multicast_event(in_dev);
1317
1318                                 ip_ma_put(i);
1319                                 return;
1320                         }
1321                         break;
1322                 }
1323         }
1324 }
1325 EXPORT_SYMBOL(ip_mc_dec_group);
1326
1327 /* Device changing type */
1328
1329 void ip_mc_unmap(struct in_device *in_dev)
1330 {
1331         struct ip_mc_list *pmc;
1332
1333         ASSERT_RTNL();
1334
1335         for_each_pmc_rtnl(in_dev, pmc)
1336                 igmp_group_dropped(pmc);
1337 }
1338
1339 void ip_mc_remap(struct in_device *in_dev)
1340 {
1341         struct ip_mc_list *pmc;
1342
1343         ASSERT_RTNL();
1344
1345         for_each_pmc_rtnl(in_dev, pmc)
1346                 igmp_group_added(pmc);
1347 }
1348
1349 /* Device going down */
1350
1351 void ip_mc_down(struct in_device *in_dev)
1352 {
1353         struct ip_mc_list *pmc;
1354
1355         ASSERT_RTNL();
1356
1357         for_each_pmc_rtnl(in_dev, pmc)
1358                 igmp_group_dropped(pmc);
1359
1360 #ifdef CONFIG_IP_MULTICAST
1361         in_dev->mr_ifc_count = 0;
1362         if (del_timer(&in_dev->mr_ifc_timer))
1363                 __in_dev_put(in_dev);
1364         in_dev->mr_gq_running = 0;
1365         if (del_timer(&in_dev->mr_gq_timer))
1366                 __in_dev_put(in_dev);
1367         igmpv3_clear_delrec(in_dev);
1368 #endif
1369
1370         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1371 }
1372
1373 void ip_mc_init_dev(struct in_device *in_dev)
1374 {
1375         ASSERT_RTNL();
1376
1377         in_dev->mc_tomb = NULL;
1378 #ifdef CONFIG_IP_MULTICAST
1379         in_dev->mr_gq_running = 0;
1380         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1381                         (unsigned long)in_dev);
1382         in_dev->mr_ifc_count = 0;
1383         in_dev->mc_count     = 0;
1384         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1385                         (unsigned long)in_dev);
1386         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1387 #endif
1388
1389         spin_lock_init(&in_dev->mc_tomb_lock);
1390 }
1391
1392 /* Device going up */
1393
1394 void ip_mc_up(struct in_device *in_dev)
1395 {
1396         struct ip_mc_list *pmc;
1397
1398         ASSERT_RTNL();
1399
1400         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1401
1402         for_each_pmc_rtnl(in_dev, pmc)
1403                 igmp_group_added(pmc);
1404 }
1405
1406 /*
1407  *      Device is about to be destroyed: clean up.
1408  */
1409
1410 void ip_mc_destroy_dev(struct in_device *in_dev)
1411 {
1412         struct ip_mc_list *i;
1413
1414         ASSERT_RTNL();
1415
1416         /* Deactivate timers */
1417         ip_mc_down(in_dev);
1418
1419         while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1420                 in_dev->mc_list = i->next_rcu;
1421                 in_dev->mc_count--;
1422
1423                 /* We've dropped the groups in ip_mc_down already */
1424                 ip_mc_clear_src(i);
1425                 ip_ma_put(i);
1426         }
1427 }
1428
1429 /* RTNL is locked */
1430 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1431 {
1432         struct net_device *dev = NULL;
1433         struct in_device *idev = NULL;
1434
1435         if (imr->imr_ifindex) {
1436                 idev = inetdev_by_index(net, imr->imr_ifindex);
1437                 return idev;
1438         }
1439         if (imr->imr_address.s_addr) {
1440                 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1441                 if (!dev)
1442                         return NULL;
1443         }
1444
1445         if (!dev) {
1446                 struct rtable *rt = ip_route_output(net,
1447                                                     imr->imr_multiaddr.s_addr,
1448                                                     0, 0, 0);
1449                 if (!IS_ERR(rt)) {
1450                         dev = rt->dst.dev;
1451                         ip_rt_put(rt);
1452                 }
1453         }
1454         if (dev) {
1455                 imr->imr_ifindex = dev->ifindex;
1456                 idev = __in_dev_get_rtnl(dev);
1457         }
1458         return idev;
1459 }
1460
1461 /*
1462  *      Join a socket to a group
1463  */
1464 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1465 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1466
1467
1468 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1469         __be32 *psfsrc)
1470 {
1471         struct ip_sf_list *psf, *psf_prev;
1472         int rv = 0;
1473
1474         psf_prev = NULL;
1475         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1476                 if (psf->sf_inaddr == *psfsrc)
1477                         break;
1478                 psf_prev = psf;
1479         }
1480         if (!psf || psf->sf_count[sfmode] == 0) {
1481                 /* source filter not found, or count wrong =>  bug */
1482                 return -ESRCH;
1483         }
1484         psf->sf_count[sfmode]--;
1485         if (psf->sf_count[sfmode] == 0) {
1486                 ip_rt_multicast_event(pmc->interface);
1487         }
1488         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1489 #ifdef CONFIG_IP_MULTICAST
1490                 struct in_device *in_dev = pmc->interface;
1491 #endif
1492
1493                 /* no more filters for this source */
1494                 if (psf_prev)
1495                         psf_prev->sf_next = psf->sf_next;
1496                 else
1497                         pmc->sources = psf->sf_next;
1498 #ifdef CONFIG_IP_MULTICAST
1499                 if (psf->sf_oldin &&
1500                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1501                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1502                                 IGMP_Unsolicited_Report_Count;
1503                         psf->sf_next = pmc->tomb;
1504                         pmc->tomb = psf;
1505                         rv = 1;
1506                 } else
1507 #endif
1508                         kfree(psf);
1509         }
1510         return rv;
1511 }
1512
1513 #ifndef CONFIG_IP_MULTICAST
1514 #define igmp_ifc_event(x)       do { } while (0)
1515 #endif
1516
1517 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1518                          int sfcount, __be32 *psfsrc, int delta)
1519 {
1520         struct ip_mc_list *pmc;
1521         int     changerec = 0;
1522         int     i, err;
1523
1524         if (!in_dev)
1525                 return -ENODEV;
1526         rcu_read_lock();
1527         for_each_pmc_rcu(in_dev, pmc) {
1528                 if (*pmca == pmc->multiaddr)
1529                         break;
1530         }
1531         if (!pmc) {
1532                 /* MCA not found?? bug */
1533                 rcu_read_unlock();
1534                 return -ESRCH;
1535         }
1536         spin_lock_bh(&pmc->lock);
1537         rcu_read_unlock();
1538 #ifdef CONFIG_IP_MULTICAST
1539         sf_markstate(pmc);
1540 #endif
1541         if (!delta) {
1542                 err = -EINVAL;
1543                 if (!pmc->sfcount[sfmode])
1544                         goto out_unlock;
1545                 pmc->sfcount[sfmode]--;
1546         }
1547         err = 0;
1548         for (i=0; i<sfcount; i++) {
1549                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1550
1551                 changerec |= rv > 0;
1552                 if (!err && rv < 0)
1553                         err = rv;
1554         }
1555         if (pmc->sfmode == MCAST_EXCLUDE &&
1556             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1557             pmc->sfcount[MCAST_INCLUDE]) {
1558 #ifdef CONFIG_IP_MULTICAST
1559                 struct ip_sf_list *psf;
1560 #endif
1561
1562                 /* filter mode change */
1563                 pmc->sfmode = MCAST_INCLUDE;
1564 #ifdef CONFIG_IP_MULTICAST
1565                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1566                         IGMP_Unsolicited_Report_Count;
1567                 in_dev->mr_ifc_count = pmc->crcount;
1568                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1569                         psf->sf_crcount = 0;
1570                 igmp_ifc_event(pmc->interface);
1571         } else if (sf_setstate(pmc) || changerec) {
1572                 igmp_ifc_event(pmc->interface);
1573 #endif
1574         }
1575 out_unlock:
1576         spin_unlock_bh(&pmc->lock);
1577         return err;
1578 }
1579
1580 /*
1581  * Add multicast single-source filter to the interface list
1582  */
1583 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1584         __be32 *psfsrc, int delta)
1585 {
1586         struct ip_sf_list *psf, *psf_prev;
1587
1588         psf_prev = NULL;
1589         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1590                 if (psf->sf_inaddr == *psfsrc)
1591                         break;
1592                 psf_prev = psf;
1593         }
1594         if (!psf) {
1595                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1596                 if (!psf)
1597                         return -ENOBUFS;
1598                 psf->sf_inaddr = *psfsrc;
1599                 if (psf_prev) {
1600                         psf_prev->sf_next = psf;
1601                 } else
1602                         pmc->sources = psf;
1603         }
1604         psf->sf_count[sfmode]++;
1605         if (psf->sf_count[sfmode] == 1) {
1606                 ip_rt_multicast_event(pmc->interface);
1607         }
1608         return 0;
1609 }
1610
1611 #ifdef CONFIG_IP_MULTICAST
1612 static void sf_markstate(struct ip_mc_list *pmc)
1613 {
1614         struct ip_sf_list *psf;
1615         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1616
1617         for (psf=pmc->sources; psf; psf=psf->sf_next)
1618                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1619                         psf->sf_oldin = mca_xcount ==
1620                                 psf->sf_count[MCAST_EXCLUDE] &&
1621                                 !psf->sf_count[MCAST_INCLUDE];
1622                 } else
1623                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1624 }
1625
1626 static int sf_setstate(struct ip_mc_list *pmc)
1627 {
1628         struct ip_sf_list *psf, *dpsf;
1629         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1630         int qrv = pmc->interface->mr_qrv;
1631         int new_in, rv;
1632
1633         rv = 0;
1634         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1635                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1636                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1637                                 !psf->sf_count[MCAST_INCLUDE];
1638                 } else
1639                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1640                 if (new_in) {
1641                         if (!psf->sf_oldin) {
1642                                 struct ip_sf_list *prev = NULL;
1643
1644                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1645                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1646                                                 break;
1647                                         prev = dpsf;
1648                                 }
1649                                 if (dpsf) {
1650                                         if (prev)
1651                                                 prev->sf_next = dpsf->sf_next;
1652                                         else
1653                                                 pmc->tomb = dpsf->sf_next;
1654                                         kfree(dpsf);
1655                                 }
1656                                 psf->sf_crcount = qrv;
1657                                 rv++;
1658                         }
1659                 } else if (psf->sf_oldin) {
1660
1661                         psf->sf_crcount = 0;
1662                         /*
1663                          * add or update "delete" records if an active filter
1664                          * is now inactive
1665                          */
1666                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1667                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1668                                         break;
1669                         if (!dpsf) {
1670                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1671                                 if (!dpsf)
1672                                         continue;
1673                                 *dpsf = *psf;
1674                                 /* pmc->lock held by callers */
1675                                 dpsf->sf_next = pmc->tomb;
1676                                 pmc->tomb = dpsf;
1677                         }
1678                         dpsf->sf_crcount = qrv;
1679                         rv++;
1680                 }
1681         }
1682         return rv;
1683 }
1684 #endif
1685
1686 /*
1687  * Add multicast source filter list to the interface list
1688  */
1689 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1690                          int sfcount, __be32 *psfsrc, int delta)
1691 {
1692         struct ip_mc_list *pmc;
1693         int     isexclude;
1694         int     i, err;
1695
1696         if (!in_dev)
1697                 return -ENODEV;
1698         rcu_read_lock();
1699         for_each_pmc_rcu(in_dev, pmc) {
1700                 if (*pmca == pmc->multiaddr)
1701                         break;
1702         }
1703         if (!pmc) {
1704                 /* MCA not found?? bug */
1705                 rcu_read_unlock();
1706                 return -ESRCH;
1707         }
1708         spin_lock_bh(&pmc->lock);
1709         rcu_read_unlock();
1710
1711 #ifdef CONFIG_IP_MULTICAST
1712         sf_markstate(pmc);
1713 #endif
1714         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1715         if (!delta)
1716                 pmc->sfcount[sfmode]++;
1717         err = 0;
1718         for (i=0; i<sfcount; i++) {
1719                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1720                 if (err)
1721                         break;
1722         }
1723         if (err) {
1724                 int j;
1725
1726                 if (!delta)
1727                         pmc->sfcount[sfmode]--;
1728                 for (j=0; j<i; j++)
1729                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1730         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1731 #ifdef CONFIG_IP_MULTICAST
1732                 struct ip_sf_list *psf;
1733                 in_dev = pmc->interface;
1734 #endif
1735
1736                 /* filter mode change */
1737                 if (pmc->sfcount[MCAST_EXCLUDE])
1738                         pmc->sfmode = MCAST_EXCLUDE;
1739                 else if (pmc->sfcount[MCAST_INCLUDE])
1740                         pmc->sfmode = MCAST_INCLUDE;
1741 #ifdef CONFIG_IP_MULTICAST
1742                 /* else no filters; keep old mode for reports */
1743
1744                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1745                         IGMP_Unsolicited_Report_Count;
1746                 in_dev->mr_ifc_count = pmc->crcount;
1747                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1748                         psf->sf_crcount = 0;
1749                 igmp_ifc_event(in_dev);
1750         } else if (sf_setstate(pmc)) {
1751                 igmp_ifc_event(in_dev);
1752 #endif
1753         }
1754         spin_unlock_bh(&pmc->lock);
1755         return err;
1756 }
1757
1758 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1759 {
1760         struct ip_sf_list *psf, *nextpsf;
1761
1762         for (psf=pmc->tomb; psf; psf=nextpsf) {
1763                 nextpsf = psf->sf_next;
1764                 kfree(psf);
1765         }
1766         pmc->tomb = NULL;
1767         for (psf=pmc->sources; psf; psf=nextpsf) {
1768                 nextpsf = psf->sf_next;
1769                 kfree(psf);
1770         }
1771         pmc->sources = NULL;
1772         pmc->sfmode = MCAST_EXCLUDE;
1773         pmc->sfcount[MCAST_INCLUDE] = 0;
1774         pmc->sfcount[MCAST_EXCLUDE] = 1;
1775 }
1776
1777
1778 /*
1779  * Join a multicast group
1780  */
1781 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1782 {
1783         int err;
1784         __be32 addr = imr->imr_multiaddr.s_addr;
1785         struct ip_mc_socklist *iml = NULL, *i;
1786         struct in_device *in_dev;
1787         struct inet_sock *inet = inet_sk(sk);
1788         struct net *net = sock_net(sk);
1789         int ifindex;
1790         int count = 0;
1791
1792         if (!ipv4_is_multicast(addr))
1793                 return -EINVAL;
1794
1795         rtnl_lock();
1796
1797         in_dev = ip_mc_find_dev(net, imr);
1798
1799         if (!in_dev) {
1800                 iml = NULL;
1801                 err = -ENODEV;
1802                 goto done;
1803         }
1804
1805         err = -EADDRINUSE;
1806         ifindex = imr->imr_ifindex;
1807         for_each_pmc_rtnl(inet, i) {
1808                 if (i->multi.imr_multiaddr.s_addr == addr &&
1809                     i->multi.imr_ifindex == ifindex)
1810                         goto done;
1811                 count++;
1812         }
1813         err = -ENOBUFS;
1814         if (count >= sysctl_igmp_max_memberships)
1815                 goto done;
1816         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1817         if (iml == NULL)
1818                 goto done;
1819
1820         memcpy(&iml->multi, imr, sizeof(*imr));
1821         iml->next_rcu = inet->mc_list;
1822         iml->sflist = NULL;
1823         iml->sfmode = MCAST_EXCLUDE;
1824         rcu_assign_pointer(inet->mc_list, iml);
1825         ip_mc_inc_group(in_dev, addr);
1826         err = 0;
1827 done:
1828         rtnl_unlock();
1829         return err;
1830 }
1831 EXPORT_SYMBOL(ip_mc_join_group);
1832
1833 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1834                            struct in_device *in_dev)
1835 {
1836         struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1837         int err;
1838
1839         if (psf == NULL) {
1840                 /* any-source empty exclude case */
1841                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1842                         iml->sfmode, 0, NULL, 0);
1843         }
1844         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1845                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1846         RCU_INIT_POINTER(iml->sflist, NULL);
1847         /* decrease mem now to avoid the memleak warning */
1848         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1849         kfree_rcu(psf, rcu);
1850         return err;
1851 }
1852
1853 /*
1854  *      Ask a socket to leave a group.
1855  */
1856
1857 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1858 {
1859         struct inet_sock *inet = inet_sk(sk);
1860         struct ip_mc_socklist *iml;
1861         struct ip_mc_socklist __rcu **imlp;
1862         struct in_device *in_dev;
1863         struct net *net = sock_net(sk);
1864         __be32 group = imr->imr_multiaddr.s_addr;
1865         u32 ifindex;
1866         int ret = -EADDRNOTAVAIL;
1867
1868         rtnl_lock();
1869         in_dev = ip_mc_find_dev(net, imr);
1870         if (!in_dev) {
1871                 ret = -ENODEV;
1872                 goto out;
1873         }
1874         ifindex = imr->imr_ifindex;
1875         for (imlp = &inet->mc_list;
1876              (iml = rtnl_dereference(*imlp)) != NULL;
1877              imlp = &iml->next_rcu) {
1878                 if (iml->multi.imr_multiaddr.s_addr != group)
1879                         continue;
1880                 if (ifindex) {
1881                         if (iml->multi.imr_ifindex != ifindex)
1882                                 continue;
1883                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1884                                 iml->multi.imr_address.s_addr)
1885                         continue;
1886
1887                 (void) ip_mc_leave_src(sk, iml, in_dev);
1888
1889                 *imlp = iml->next_rcu;
1890
1891                 ip_mc_dec_group(in_dev, group);
1892                 rtnl_unlock();
1893                 /* decrease mem now to avoid the memleak warning */
1894                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1895                 kfree_rcu(iml, rcu);
1896                 return 0;
1897         }
1898 out:
1899         rtnl_unlock();
1900         return ret;
1901 }
1902
1903 int ip_mc_source(int add, int omode, struct sock *sk, struct
1904         ip_mreq_source *mreqs, int ifindex)
1905 {
1906         int err;
1907         struct ip_mreqn imr;
1908         __be32 addr = mreqs->imr_multiaddr;
1909         struct ip_mc_socklist *pmc;
1910         struct in_device *in_dev = NULL;
1911         struct inet_sock *inet = inet_sk(sk);
1912         struct ip_sf_socklist *psl;
1913         struct net *net = sock_net(sk);
1914         int leavegroup = 0;
1915         int i, j, rv;
1916
1917         if (!ipv4_is_multicast(addr))
1918                 return -EINVAL;
1919
1920         rtnl_lock();
1921
1922         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1923         imr.imr_address.s_addr = mreqs->imr_interface;
1924         imr.imr_ifindex = ifindex;
1925         in_dev = ip_mc_find_dev(net, &imr);
1926
1927         if (!in_dev) {
1928                 err = -ENODEV;
1929                 goto done;
1930         }
1931         err = -EADDRNOTAVAIL;
1932
1933         for_each_pmc_rtnl(inet, pmc) {
1934                 if ((pmc->multi.imr_multiaddr.s_addr ==
1935                      imr.imr_multiaddr.s_addr) &&
1936                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
1937                         break;
1938         }
1939         if (!pmc) {             /* must have a prior join */
1940                 err = -EINVAL;
1941                 goto done;
1942         }
1943         /* if a source filter was set, must be the same mode as before */
1944         if (pmc->sflist) {
1945                 if (pmc->sfmode != omode) {
1946                         err = -EINVAL;
1947                         goto done;
1948                 }
1949         } else if (pmc->sfmode != omode) {
1950                 /* allow mode switches for empty-set filters */
1951                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1952                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1953                         NULL, 0);
1954                 pmc->sfmode = omode;
1955         }
1956
1957         psl = rtnl_dereference(pmc->sflist);
1958         if (!add) {
1959                 if (!psl)
1960                         goto done;      /* err = -EADDRNOTAVAIL */
1961                 rv = !0;
1962                 for (i=0; i<psl->sl_count; i++) {
1963                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1964                                 sizeof(__be32));
1965                         if (rv == 0)
1966                                 break;
1967                 }
1968                 if (rv)         /* source not found */
1969                         goto done;      /* err = -EADDRNOTAVAIL */
1970
1971                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1972                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1973                         leavegroup = 1;
1974                         goto done;
1975                 }
1976
1977                 /* update the interface filter */
1978                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1979                         &mreqs->imr_sourceaddr, 1);
1980
1981                 for (j=i+1; j<psl->sl_count; j++)
1982                         psl->sl_addr[j-1] = psl->sl_addr[j];
1983                 psl->sl_count--;
1984                 err = 0;
1985                 goto done;
1986         }
1987         /* else, add a new source to the filter */
1988
1989         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1990                 err = -ENOBUFS;
1991                 goto done;
1992         }
1993         if (!psl || psl->sl_count == psl->sl_max) {
1994                 struct ip_sf_socklist *newpsl;
1995                 int count = IP_SFBLOCK;
1996
1997                 if (psl)
1998                         count += psl->sl_max;
1999                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2000                 if (!newpsl) {
2001                         err = -ENOBUFS;
2002                         goto done;
2003                 }
2004                 newpsl->sl_max = count;
2005                 newpsl->sl_count = count - IP_SFBLOCK;
2006                 if (psl) {
2007                         for (i=0; i<psl->sl_count; i++)
2008                                 newpsl->sl_addr[i] = psl->sl_addr[i];
2009                         /* decrease mem now to avoid the memleak warning */
2010                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2011                         kfree_rcu(psl, rcu);
2012                 }
2013                 rcu_assign_pointer(pmc->sflist, newpsl);
2014                 psl = newpsl;
2015         }
2016         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2017         for (i=0; i<psl->sl_count; i++) {
2018                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2019                         sizeof(__be32));
2020                 if (rv == 0)
2021                         break;
2022         }
2023         if (rv == 0)            /* address already there is an error */
2024                 goto done;
2025         for (j=psl->sl_count-1; j>=i; j--)
2026                 psl->sl_addr[j+1] = psl->sl_addr[j];
2027         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2028         psl->sl_count++;
2029         err = 0;
2030         /* update the interface list */
2031         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2032                 &mreqs->imr_sourceaddr, 1);
2033 done:
2034         rtnl_unlock();
2035         if (leavegroup)
2036                 return ip_mc_leave_group(sk, &imr);
2037         return err;
2038 }
2039
2040 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2041 {
2042         int err = 0;
2043         struct ip_mreqn imr;
2044         __be32 addr = msf->imsf_multiaddr;
2045         struct ip_mc_socklist *pmc;
2046         struct in_device *in_dev;
2047         struct inet_sock *inet = inet_sk(sk);
2048         struct ip_sf_socklist *newpsl, *psl;
2049         struct net *net = sock_net(sk);
2050         int leavegroup = 0;
2051
2052         if (!ipv4_is_multicast(addr))
2053                 return -EINVAL;
2054         if (msf->imsf_fmode != MCAST_INCLUDE &&
2055             msf->imsf_fmode != MCAST_EXCLUDE)
2056                 return -EINVAL;
2057
2058         rtnl_lock();
2059
2060         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2061         imr.imr_address.s_addr = msf->imsf_interface;
2062         imr.imr_ifindex = ifindex;
2063         in_dev = ip_mc_find_dev(net, &imr);
2064
2065         if (!in_dev) {
2066                 err = -ENODEV;
2067                 goto done;
2068         }
2069
2070         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2071         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2072                 leavegroup = 1;
2073                 goto done;
2074         }
2075
2076         for_each_pmc_rtnl(inet, pmc) {
2077                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2078                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2079                         break;
2080         }
2081         if (!pmc) {             /* must have a prior join */
2082                 err = -EINVAL;
2083                 goto done;
2084         }
2085         if (msf->imsf_numsrc) {
2086                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2087                                                            GFP_KERNEL);
2088                 if (!newpsl) {
2089                         err = -ENOBUFS;
2090                         goto done;
2091                 }
2092                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2093                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2094                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2095                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2096                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2097                 if (err) {
2098                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2099                         goto done;
2100                 }
2101         } else {
2102                 newpsl = NULL;
2103                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2104                                      msf->imsf_fmode, 0, NULL, 0);
2105         }
2106         psl = rtnl_dereference(pmc->sflist);
2107         if (psl) {
2108                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2109                         psl->sl_count, psl->sl_addr, 0);
2110                 /* decrease mem now to avoid the memleak warning */
2111                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2112                 kfree_rcu(psl, rcu);
2113         } else
2114                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2115                         0, NULL, 0);
2116         rcu_assign_pointer(pmc->sflist, newpsl);
2117         pmc->sfmode = msf->imsf_fmode;
2118         err = 0;
2119 done:
2120         rtnl_unlock();
2121         if (leavegroup)
2122                 err = ip_mc_leave_group(sk, &imr);
2123         return err;
2124 }
2125
2126 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2127         struct ip_msfilter __user *optval, int __user *optlen)
2128 {
2129         int err, len, count, copycount;
2130         struct ip_mreqn imr;
2131         __be32 addr = msf->imsf_multiaddr;
2132         struct ip_mc_socklist *pmc;
2133         struct in_device *in_dev;
2134         struct inet_sock *inet = inet_sk(sk);
2135         struct ip_sf_socklist *psl;
2136         struct net *net = sock_net(sk);
2137
2138         if (!ipv4_is_multicast(addr))
2139                 return -EINVAL;
2140
2141         rtnl_lock();
2142
2143         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2144         imr.imr_address.s_addr = msf->imsf_interface;
2145         imr.imr_ifindex = 0;
2146         in_dev = ip_mc_find_dev(net, &imr);
2147
2148         if (!in_dev) {
2149                 err = -ENODEV;
2150                 goto done;
2151         }
2152         err = -EADDRNOTAVAIL;
2153
2154         for_each_pmc_rtnl(inet, pmc) {
2155                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2156                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2157                         break;
2158         }
2159         if (!pmc)               /* must have a prior join */
2160                 goto done;
2161         msf->imsf_fmode = pmc->sfmode;
2162         psl = rtnl_dereference(pmc->sflist);
2163         rtnl_unlock();
2164         if (!psl) {
2165                 len = 0;
2166                 count = 0;
2167         } else {
2168                 count = psl->sl_count;
2169         }
2170         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2171         len = copycount * sizeof(psl->sl_addr[0]);
2172         msf->imsf_numsrc = count;
2173         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2174             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2175                 return -EFAULT;
2176         }
2177         if (len &&
2178             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2179                 return -EFAULT;
2180         return 0;
2181 done:
2182         rtnl_unlock();
2183         return err;
2184 }
2185
2186 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2187         struct group_filter __user *optval, int __user *optlen)
2188 {
2189         int err, i, count, copycount;
2190         struct sockaddr_in *psin;
2191         __be32 addr;
2192         struct ip_mc_socklist *pmc;
2193         struct inet_sock *inet = inet_sk(sk);
2194         struct ip_sf_socklist *psl;
2195
2196         psin = (struct sockaddr_in *)&gsf->gf_group;
2197         if (psin->sin_family != AF_INET)
2198                 return -EINVAL;
2199         addr = psin->sin_addr.s_addr;
2200         if (!ipv4_is_multicast(addr))
2201                 return -EINVAL;
2202
2203         rtnl_lock();
2204
2205         err = -EADDRNOTAVAIL;
2206
2207         for_each_pmc_rtnl(inet, pmc) {
2208                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2209                     pmc->multi.imr_ifindex == gsf->gf_interface)
2210                         break;
2211         }
2212         if (!pmc)               /* must have a prior join */
2213                 goto done;
2214         gsf->gf_fmode = pmc->sfmode;
2215         psl = rtnl_dereference(pmc->sflist);
2216         rtnl_unlock();
2217         count = psl ? psl->sl_count : 0;
2218         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2219         gsf->gf_numsrc = count;
2220         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2221             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2222                 return -EFAULT;
2223         }
2224         for (i=0; i<copycount; i++) {
2225                 struct sockaddr_storage ss;
2226
2227                 psin = (struct sockaddr_in *)&ss;
2228                 memset(&ss, 0, sizeof(ss));
2229                 psin->sin_family = AF_INET;
2230                 psin->sin_addr.s_addr = psl->sl_addr[i];
2231                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2232                         return -EFAULT;
2233         }
2234         return 0;
2235 done:
2236         rtnl_unlock();
2237         return err;
2238 }
2239
2240 /*
2241  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2242  */
2243 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2244 {
2245         struct inet_sock *inet = inet_sk(sk);
2246         struct ip_mc_socklist *pmc;
2247         struct ip_sf_socklist *psl;
2248         int i;
2249         int ret;
2250
2251         ret = 1;
2252         if (!ipv4_is_multicast(loc_addr))
2253                 goto out;
2254
2255         rcu_read_lock();
2256         for_each_pmc_rcu(inet, pmc) {
2257                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2258                     pmc->multi.imr_ifindex == dif)
2259                         break;
2260         }
2261         ret = inet->mc_all;
2262         if (!pmc)
2263                 goto unlock;
2264         psl = rcu_dereference(pmc->sflist);
2265         ret = (pmc->sfmode == MCAST_EXCLUDE);
2266         if (!psl)
2267                 goto unlock;
2268
2269         for (i=0; i<psl->sl_count; i++) {
2270                 if (psl->sl_addr[i] == rmt_addr)
2271                         break;
2272         }
2273         ret = 0;
2274         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2275                 goto unlock;
2276         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2277                 goto unlock;
2278         ret = 1;
2279 unlock:
2280         rcu_read_unlock();
2281 out:
2282         return ret;
2283 }
2284
2285 /*
2286  *      A socket is closing.
2287  */
2288
2289 void ip_mc_drop_socket(struct sock *sk)
2290 {
2291         struct inet_sock *inet = inet_sk(sk);
2292         struct ip_mc_socklist *iml;
2293         struct net *net = sock_net(sk);
2294
2295         if (inet->mc_list == NULL)
2296                 return;
2297
2298         rtnl_lock();
2299         while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2300                 struct in_device *in_dev;
2301
2302                 inet->mc_list = iml->next_rcu;
2303                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2304                 (void) ip_mc_leave_src(sk, iml, in_dev);
2305                 if (in_dev != NULL)
2306                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2307                 /* decrease mem now to avoid the memleak warning */
2308                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2309                 kfree_rcu(iml, rcu);
2310         }
2311         rtnl_unlock();
2312 }
2313
2314 /* called with rcu_read_lock() */
2315 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2316 {
2317         struct ip_mc_list *im;
2318         struct ip_sf_list *psf;
2319         int rv = 0;
2320
2321         for_each_pmc_rcu(in_dev, im) {
2322                 if (im->multiaddr == mc_addr)
2323                         break;
2324         }
2325         if (im && proto == IPPROTO_IGMP) {
2326                 rv = 1;
2327         } else if (im) {
2328                 if (src_addr) {
2329                         for (psf=im->sources; psf; psf=psf->sf_next) {
2330                                 if (psf->sf_inaddr == src_addr)
2331                                         break;
2332                         }
2333                         if (psf)
2334                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2335                                         psf->sf_count[MCAST_EXCLUDE] !=
2336                                         im->sfcount[MCAST_EXCLUDE];
2337                         else
2338                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2339                 } else
2340                         rv = 1; /* unspecified source; tentatively allow */
2341         }
2342         return rv;
2343 }
2344
2345 #if defined(CONFIG_PROC_FS)
2346 struct igmp_mc_iter_state {
2347         struct seq_net_private p;
2348         struct net_device *dev;
2349         struct in_device *in_dev;
2350 };
2351
2352 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2353
2354 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2355 {
2356         struct net *net = seq_file_net(seq);
2357         struct ip_mc_list *im = NULL;
2358         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2359
2360         state->in_dev = NULL;
2361         for_each_netdev_rcu(net, state->dev) {
2362                 struct in_device *in_dev;
2363
2364                 in_dev = __in_dev_get_rcu(state->dev);
2365                 if (!in_dev)
2366                         continue;
2367                 im = rcu_dereference(in_dev->mc_list);
2368                 if (im) {
2369                         state->in_dev = in_dev;
2370                         break;
2371                 }
2372         }
2373         return im;
2374 }
2375
2376 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2377 {
2378         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2379
2380         im = rcu_dereference(im->next_rcu);
2381         while (!im) {
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                 im = rcu_dereference(state->in_dev->mc_list);
2391         }
2392         return im;
2393 }
2394
2395 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2396 {
2397         struct ip_mc_list *im = igmp_mc_get_first(seq);
2398         if (im)
2399                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2400                         --pos;
2401         return pos ? NULL : im;
2402 }
2403
2404 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2405         __acquires(rcu)
2406 {
2407         rcu_read_lock();
2408         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2409 }
2410
2411 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2412 {
2413         struct ip_mc_list *im;
2414         if (v == SEQ_START_TOKEN)
2415                 im = igmp_mc_get_first(seq);
2416         else
2417                 im = igmp_mc_get_next(seq, v);
2418         ++*pos;
2419         return im;
2420 }
2421
2422 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2423         __releases(rcu)
2424 {
2425         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2426
2427         state->in_dev = NULL;
2428         state->dev = NULL;
2429         rcu_read_unlock();
2430 }
2431
2432 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2433 {
2434         if (v == SEQ_START_TOKEN)
2435                 seq_puts(seq,
2436                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2437         else {
2438                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2439                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2440                 char   *querier;
2441 #ifdef CONFIG_IP_MULTICAST
2442                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2443                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2444                           "V3";
2445 #else
2446                 querier = "NONE";
2447 #endif
2448
2449                 if (rcu_dereference(state->in_dev->mc_list) == im) {
2450                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2451                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2452                 }
2453
2454                 seq_printf(seq,
2455                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2456                            im->multiaddr, im->users,
2457                            im->tm_running, im->tm_running ?
2458                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2459                            im->reporter);
2460         }
2461         return 0;
2462 }
2463
2464 static const struct seq_operations igmp_mc_seq_ops = {
2465         .start  =       igmp_mc_seq_start,
2466         .next   =       igmp_mc_seq_next,
2467         .stop   =       igmp_mc_seq_stop,
2468         .show   =       igmp_mc_seq_show,
2469 };
2470
2471 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2472 {
2473         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2474                         sizeof(struct igmp_mc_iter_state));
2475 }
2476
2477 static const struct file_operations igmp_mc_seq_fops = {
2478         .owner          =       THIS_MODULE,
2479         .open           =       igmp_mc_seq_open,
2480         .read           =       seq_read,
2481         .llseek         =       seq_lseek,
2482         .release        =       seq_release_net,
2483 };
2484
2485 struct igmp_mcf_iter_state {
2486         struct seq_net_private p;
2487         struct net_device *dev;
2488         struct in_device *idev;
2489         struct ip_mc_list *im;
2490 };
2491
2492 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2493
2494 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2495 {
2496         struct net *net = seq_file_net(seq);
2497         struct ip_sf_list *psf = NULL;
2498         struct ip_mc_list *im = NULL;
2499         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2500
2501         state->idev = NULL;
2502         state->im = NULL;
2503         for_each_netdev_rcu(net, state->dev) {
2504                 struct in_device *idev;
2505                 idev = __in_dev_get_rcu(state->dev);
2506                 if (unlikely(idev == NULL))
2507                         continue;
2508                 im = rcu_dereference(idev->mc_list);
2509                 if (likely(im != NULL)) {
2510                         spin_lock_bh(&im->lock);
2511                         psf = im->sources;
2512                         if (likely(psf != NULL)) {
2513                                 state->im = im;
2514                                 state->idev = idev;
2515                                 break;
2516                         }
2517                         spin_unlock_bh(&im->lock);
2518                 }
2519         }
2520         return psf;
2521 }
2522
2523 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2524 {
2525         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2526
2527         psf = psf->sf_next;
2528         while (!psf) {
2529                 spin_unlock_bh(&state->im->lock);
2530                 state->im = state->im->next;
2531                 while (!state->im) {
2532                         state->dev = next_net_device_rcu(state->dev);
2533                         if (!state->dev) {
2534                                 state->idev = NULL;
2535                                 goto out;
2536                         }
2537                         state->idev = __in_dev_get_rcu(state->dev);
2538                         if (!state->idev)
2539                                 continue;
2540                         state->im = rcu_dereference(state->idev->mc_list);
2541                 }
2542                 if (!state->im)
2543                         break;
2544                 spin_lock_bh(&state->im->lock);
2545                 psf = state->im->sources;
2546         }
2547 out:
2548         return psf;
2549 }
2550
2551 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2552 {
2553         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2554         if (psf)
2555                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2556                         --pos;
2557         return pos ? NULL : psf;
2558 }
2559
2560 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2561         __acquires(rcu)
2562 {
2563         rcu_read_lock();
2564         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2565 }
2566
2567 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2568 {
2569         struct ip_sf_list *psf;
2570         if (v == SEQ_START_TOKEN)
2571                 psf = igmp_mcf_get_first(seq);
2572         else
2573                 psf = igmp_mcf_get_next(seq, v);
2574         ++*pos;
2575         return psf;
2576 }
2577
2578 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2579         __releases(rcu)
2580 {
2581         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2582         if (likely(state->im != NULL)) {
2583                 spin_unlock_bh(&state->im->lock);
2584                 state->im = NULL;
2585         }
2586         state->idev = NULL;
2587         state->dev = NULL;
2588         rcu_read_unlock();
2589 }
2590
2591 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2592 {
2593         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2594         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2595
2596         if (v == SEQ_START_TOKEN) {
2597                 seq_printf(seq,
2598                            "%3s %6s "
2599                            "%10s %10s %6s %6s\n", "Idx",
2600                            "Device", "MCA",
2601                            "SRC", "INC", "EXC");
2602         } else {
2603                 seq_printf(seq,
2604                            "%3d %6.6s 0x%08x "
2605                            "0x%08x %6lu %6lu\n",
2606                            state->dev->ifindex, state->dev->name,
2607                            ntohl(state->im->multiaddr),
2608                            ntohl(psf->sf_inaddr),
2609                            psf->sf_count[MCAST_INCLUDE],
2610                            psf->sf_count[MCAST_EXCLUDE]);
2611         }
2612         return 0;
2613 }
2614
2615 static const struct seq_operations igmp_mcf_seq_ops = {
2616         .start  =       igmp_mcf_seq_start,
2617         .next   =       igmp_mcf_seq_next,
2618         .stop   =       igmp_mcf_seq_stop,
2619         .show   =       igmp_mcf_seq_show,
2620 };
2621
2622 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2623 {
2624         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2625                         sizeof(struct igmp_mcf_iter_state));
2626 }
2627
2628 static const struct file_operations igmp_mcf_seq_fops = {
2629         .owner          =       THIS_MODULE,
2630         .open           =       igmp_mcf_seq_open,
2631         .read           =       seq_read,
2632         .llseek         =       seq_lseek,
2633         .release        =       seq_release_net,
2634 };
2635
2636 static int __net_init igmp_net_init(struct net *net)
2637 {
2638         struct proc_dir_entry *pde;
2639
2640         pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2641         if (!pde)
2642                 goto out_igmp;
2643         pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2644         if (!pde)
2645                 goto out_mcfilter;
2646         return 0;
2647
2648 out_mcfilter:
2649         proc_net_remove(net, "igmp");
2650 out_igmp:
2651         return -ENOMEM;
2652 }
2653
2654 static void __net_exit igmp_net_exit(struct net *net)
2655 {
2656         proc_net_remove(net, "mcfilter");
2657         proc_net_remove(net, "igmp");
2658 }
2659
2660 static struct pernet_operations igmp_net_ops = {
2661         .init = igmp_net_init,
2662         .exit = igmp_net_exit,
2663 };
2664
2665 int __init igmp_mc_proc_init(void)
2666 {
2667         return register_pernet_subsys(&igmp_net_ops);
2668 }
2669 #endif