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
 153 static void ip_mc_list_reclaim(struct rcu_head *head)
 154 {
 155         kfree(container_of(head, struct ip_mc_list, rcu));
 156 }
 157
 158 static void ip_ma_put(struct ip_mc_list *im)
 159 {
 160         if (atomic_dec_and_test(&im->refcnt)) {
 161                 in_dev_put(im->interface);
 162                 call_rcu(&im->rcu, ip_mc_list_reclaim);
 163         }
 164 }
 165
 166 #define for_each_pmc_rcu(in_dev, pmc)                           \
 167         for (pmc = rcu_dereference(in_dev->mc_list);            \
 168              pmc != NULL;                                       \
 169              pmc = rcu_dereference(pmc->next_rcu))
 170
 171 #define for_each_pmc_rtnl(in_dev, pmc)                          \
 172         for (pmc = rtnl_dereference(in_dev->mc_list);           \
 173              pmc != NULL;                                       \
 174              pmc = rtnl_dereference(pmc->next_rcu))
 175
 176 #ifdef CONFIG_IP_MULTICAST
 177
 178 /*
 179  *      Timer management
 180  */
 181
 182 static void igmp_stop_timer(struct ip_mc_list *im)
 183 {
 184         spin_lock_bh(&im->lock);
 185         if (del_timer(&im->timer))
 186                 atomic_dec(&im->refcnt);
 187         im->tm_running = 0;
 188         im->reporter = 0;
 189         im->unsolicit_count = 0;
 190         spin_unlock_bh(&im->lock);
 191 }
 192
 193 /* It must be called with locked im->lock */
 194 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 195 {
 196         int tv = net_random() % max_delay;
 197
 198         im->tm_running = 1;
 199         if (!mod_timer(&im->timer, jiffies+tv+2))
 200                 atomic_inc(&im->refcnt);
 201 }
 202
 203 static void igmp_gq_start_timer(struct in_device *in_dev)
 204 {
 205         int tv = net_random() % in_dev->mr_maxdelay;
 206
 207         in_dev->mr_gq_running = 1;
 208         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 209                 in_dev_hold(in_dev);
 210 }
 211
 212 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 213 {
 214         int tv = net_random() % delay;
 215
 216         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 217                 in_dev_hold(in_dev);
 218 }
 219
 220 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 221 {
 222         spin_lock_bh(&im->lock);
 223         im->unsolicit_count = 0;
 224         if (del_timer(&im->timer)) {
 225                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 226                         add_timer(&im->timer);
 227                         im->tm_running = 1;
 228                         spin_unlock_bh(&im->lock);
 229                         return;
 230                 }
 231                 atomic_dec(&im->refcnt);
 232         }
 233         igmp_start_timer(im, max_delay);
 234         spin_unlock_bh(&im->lock);
 235 }
 236
 237
 238 /*
 239  *      Send an IGMP report.
 240  */
 241
 242 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 243
 244
 245 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 246         int gdeleted, int sdeleted)
 247 {
 248         switch (type) {
 249         case IGMPV3_MODE_IS_INCLUDE:
 250         case IGMPV3_MODE_IS_EXCLUDE:
 251                 if (gdeleted || sdeleted)
 252                         return 0;
 253                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 254                         if (pmc->sfmode == MCAST_INCLUDE)
 255                                 return 1;
 256                         /* don't include if this source is excluded
 257                          * in all filters
 258                          */
 259                         if (psf->sf_count[MCAST_INCLUDE])
 260                                 return type == IGMPV3_MODE_IS_INCLUDE;
 261                         return pmc->sfcount[MCAST_EXCLUDE] ==
 262                                 psf->sf_count[MCAST_EXCLUDE];
 263                 }
 264                 return 0;
 265         case IGMPV3_CHANGE_TO_INCLUDE:
 266                 if (gdeleted || sdeleted)
 267                         return 0;
 268                 return psf->sf_count[MCAST_INCLUDE] != 0;
 269         case IGMPV3_CHANGE_TO_EXCLUDE:
 270                 if (gdeleted || sdeleted)
 271                         return 0;
 272                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 273                     psf->sf_count[MCAST_INCLUDE])
 274                         return 0;
 275                 return pmc->sfcount[MCAST_EXCLUDE] ==
 276                         psf->sf_count[MCAST_EXCLUDE];
 277         case IGMPV3_ALLOW_NEW_SOURCES:
 278                 if (gdeleted || !psf->sf_crcount)
 279                         return 0;
 280                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 281         case IGMPV3_BLOCK_OLD_SOURCES:
 282                 if (pmc->sfmode == MCAST_INCLUDE)
 283                         return gdeleted || (psf->sf_crcount && sdeleted);
 284                 return psf->sf_crcount && !gdeleted && !sdeleted;
 285         }
 286         return 0;
 287 }
 288
 289 static int
 290 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 291 {
 292         struct ip_sf_list *psf;
 293         int scount = 0;
 294
 295         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 296                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 297                         continue;
 298                 scount++;
 299         }
 300         return scount;
 301 }
 302
 303 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 304 {
 305         struct sk_buff *skb;
 306         struct rtable *rt;
 307         struct iphdr *pip;
 308         struct igmpv3_report *pig;
 309         struct net *net = dev_net(dev);
 310
 311         skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 312         if (skb == NULL)
 313                 return NULL;
 314
 315         {
 316                 struct flowi fl = { .oif = dev->ifindex,
 317                                     .fl4_dst = IGMPV3_ALL_MCR,
 318                                     .proto = IPPROTO_IGMP };
 319                 if (ip_route_output_key(net, &rt, &fl)) {
 320                         kfree_skb(skb);
 321                         return NULL;
 322                 }
 323         }
 324         if (rt->rt_src == 0) {
 325                 kfree_skb(skb);
 326                 ip_rt_put(rt);
 327                 return NULL;
 328         }
 329
 330         skb_dst_set(skb, &rt->dst);
 331         skb->dev = dev;
 332
 333         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 334
 335         skb_reset_network_header(skb);
 336         pip = ip_hdr(skb);
 337         skb_put(skb, sizeof(struct iphdr) + 4);
 338
 339         pip->version  = 4;
 340         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 341         pip->tos      = 0xc0;
 342         pip->frag_off = htons(IP_DF);
 343         pip->ttl      = 1;
 344         pip->daddr    = rt->rt_dst;
 345         pip->saddr    = rt->rt_src;
 346         pip->protocol = IPPROTO_IGMP;
 347         pip->tot_len  = 0;      /* filled in later */
 348         ip_select_ident(pip, &rt->dst, NULL);
 349         ((u8*)&pip[1])[0] = IPOPT_RA;
 350         ((u8*)&pip[1])[1] = 4;
 351         ((u8*)&pip[1])[2] = 0;
 352         ((u8*)&pip[1])[3] = 0;
 353
 354         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 355         skb_put(skb, sizeof(*pig));
 356         pig = igmpv3_report_hdr(skb);
 357         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 358         pig->resv1 = 0;
 359         pig->csum = 0;
 360         pig->resv2 = 0;
 361         pig->ngrec = 0;
 362         return skb;
 363 }
 364
 365 static int igmpv3_sendpack(struct sk_buff *skb)
 366 {
 367         struct igmphdr *pig = igmp_hdr(skb);
 368         const int igmplen = skb->tail - skb->transport_header;
 369
 370         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 371
 372         return ip_local_out(skb);
 373 }
 374
 375 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 376 {
 377         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
 378 }
 379
 380 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 381         int type, struct igmpv3_grec **ppgr)
 382 {
 383         struct net_device *dev = pmc->interface->dev;
 384         struct igmpv3_report *pih;
 385         struct igmpv3_grec *pgr;
 386
 387         if (!skb)
 388                 skb = igmpv3_newpack(dev, dev->mtu);
 389         if (!skb)
 390                 return NULL;
 391         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 392         pgr->grec_type = type;
 393         pgr->grec_auxwords = 0;
 394         pgr->grec_nsrcs = 0;
 395         pgr->grec_mca = pmc->multiaddr;
 396         pih = igmpv3_report_hdr(skb);
 397         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 398         *ppgr = pgr;
 399         return skb;
 400 }
 401
 402 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 403         skb_tailroom(skb)) : 0)
 404
 405 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 406         int type, int gdeleted, int sdeleted)
 407 {
 408         struct net_device *dev = pmc->interface->dev;
 409         struct igmpv3_report *pih;
 410         struct igmpv3_grec *pgr = NULL;
 411         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 412         int scount, stotal, first, isquery, truncate;
 413
 414         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 415                 return skb;
 416
 417         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 418                   type == IGMPV3_MODE_IS_EXCLUDE;
 419         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 420                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 421
 422         stotal = scount = 0;
 423
 424         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 425
 426         if (!*psf_list)
 427                 goto empty_source;
 428
 429         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 430
 431         /* EX and TO_EX get a fresh packet, if needed */
 432         if (truncate) {
 433                 if (pih && pih->ngrec &&
 434                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 435                         if (skb)
 436                                 igmpv3_sendpack(skb);
 437                         skb = igmpv3_newpack(dev, dev->mtu);
 438                 }
 439         }
 440         first = 1;
 441         psf_prev = NULL;
 442         for (psf=*psf_list; psf; psf=psf_next) {
 443                 __be32 *psrc;
 444
 445                 psf_next = psf->sf_next;
 446
 447                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 448                         psf_prev = psf;
 449                         continue;
 450                 }
 451
 452                 /* clear marks on query responses */
 453                 if (isquery)
 454                         psf->sf_gsresp = 0;
 455
 456                 if (AVAILABLE(skb) < sizeof(__be32) +
 457                     first*sizeof(struct igmpv3_grec)) {
 458                         if (truncate && !first)
 459                                 break;   /* truncate these */
 460                         if (pgr)
 461                                 pgr->grec_nsrcs = htons(scount);
 462                         if (skb)
 463                                 igmpv3_sendpack(skb);
 464                         skb = igmpv3_newpack(dev, dev->mtu);
 465                         first = 1;
 466                         scount = 0;
 467                 }
 468                 if (first) {
 469                         skb = add_grhead(skb, pmc, type, &pgr);
 470                         first = 0;
 471                 }
 472                 if (!skb)
 473                         return NULL;
 474                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 475                 *psrc = psf->sf_inaddr;
 476                 scount++; stotal++;
 477                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 478                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 479                         psf->sf_crcount--;
 480                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 481                                 if (psf_prev)
 482                                         psf_prev->sf_next = psf->sf_next;
 483                                 else
 484                                         *psf_list = psf->sf_next;
 485                                 kfree(psf);
 486                                 continue;
 487                         }
 488                 }
 489                 psf_prev = psf;
 490         }
 491
 492 empty_source:
 493         if (!stotal) {
 494                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 495                     type == IGMPV3_BLOCK_OLD_SOURCES)
 496                         return skb;
 497                 if (pmc->crcount || isquery) {
 498                         /* make sure we have room for group header */
 499                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 500                                 igmpv3_sendpack(skb);
 501                                 skb = NULL; /* add_grhead will get a new one */
 502                         }
 503                         skb = add_grhead(skb, pmc, type, &pgr);
 504                 }
 505         }
 506         if (pgr)
 507                 pgr->grec_nsrcs = htons(scount);
 508
 509         if (isquery)
 510                 pmc->gsquery = 0;       /* clear query state on report */
 511         return skb;
 512 }
 513
 514 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 515 {
 516         struct sk_buff *skb = NULL;
 517         int type;
 518
 519         if (!pmc) {
 520                 rcu_read_lock();
 521                 for_each_pmc_rcu(in_dev, pmc) {
 522                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 523                                 continue;
 524                         spin_lock_bh(&pmc->lock);
 525                         if (pmc->sfcount[MCAST_EXCLUDE])
 526                                 type = IGMPV3_MODE_IS_EXCLUDE;
 527                         else
 528                                 type = IGMPV3_MODE_IS_INCLUDE;
 529                         skb = add_grec(skb, pmc, type, 0, 0);
 530                         spin_unlock_bh(&pmc->lock);
 531                 }
 532                 rcu_read_unlock();
 533         } else {
 534                 spin_lock_bh(&pmc->lock);
 535                 if (pmc->sfcount[MCAST_EXCLUDE])
 536                         type = IGMPV3_MODE_IS_EXCLUDE;
 537                 else
 538                         type = IGMPV3_MODE_IS_INCLUDE;
 539                 skb = add_grec(skb, pmc, type, 0, 0);
 540                 spin_unlock_bh(&pmc->lock);
 541         }
 542         if (!skb)
 543                 return 0;
 544         return igmpv3_sendpack(skb);
 545 }
 546
 547 /*
 548  * remove zero-count source records from a source filter list
 549  */
 550 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 551 {
 552         struct ip_sf_list *psf_prev, *psf_next, *psf;
 553
 554         psf_prev = NULL;
 555         for (psf=*ppsf; psf; psf = psf_next) {
 556                 psf_next = psf->sf_next;
 557                 if (psf->sf_crcount == 0) {
 558                         if (psf_prev)
 559                                 psf_prev->sf_next = psf->sf_next;
 560                         else
 561                                 *ppsf = psf->sf_next;
 562                         kfree(psf);
 563                 } else
 564                         psf_prev = psf;
 565         }
 566 }
 567
 568 static void igmpv3_send_cr(struct in_device *in_dev)
 569 {
 570         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 571         struct sk_buff *skb = NULL;
 572         int type, dtype;
 573
 574         rcu_read_lock();
 575         spin_lock_bh(&in_dev->mc_tomb_lock);
 576
 577         /* deleted MCA's */
 578         pmc_prev = NULL;
 579         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 580                 pmc_next = pmc->next;
 581                 if (pmc->sfmode == MCAST_INCLUDE) {
 582                         type = IGMPV3_BLOCK_OLD_SOURCES;
 583                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 584                         skb = add_grec(skb, pmc, type, 1, 0);
 585                         skb = add_grec(skb, pmc, dtype, 1, 1);
 586                 }
 587                 if (pmc->crcount) {
 588                         if (pmc->sfmode == MCAST_EXCLUDE) {
 589                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 590                                 skb = add_grec(skb, pmc, type, 1, 0);
 591                         }
 592                         pmc->crcount--;
 593                         if (pmc->crcount == 0) {
 594                                 igmpv3_clear_zeros(&pmc->tomb);
 595                                 igmpv3_clear_zeros(&pmc->sources);
 596                         }
 597                 }
 598                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 599                         if (pmc_prev)
 600                                 pmc_prev->next = pmc_next;
 601                         else
 602                                 in_dev->mc_tomb = pmc_next;
 603                         in_dev_put(pmc->interface);
 604                         kfree(pmc);
 605                 } else
 606                         pmc_prev = pmc;
 607         }
 608         spin_unlock_bh(&in_dev->mc_tomb_lock);
 609
 610         /* change recs */
 611         for_each_pmc_rcu(in_dev, pmc) {
 612                 spin_lock_bh(&pmc->lock);
 613                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 614                         type = IGMPV3_BLOCK_OLD_SOURCES;
 615                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 616                 } else {
 617                         type = IGMPV3_ALLOW_NEW_SOURCES;
 618                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 619                 }
 620                 skb = add_grec(skb, pmc, type, 0, 0);
 621                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 622
 623                 /* filter mode changes */
 624                 if (pmc->crcount) {
 625                         if (pmc->sfmode == MCAST_EXCLUDE)
 626                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 627                         else
 628                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 629                         skb = add_grec(skb, pmc, type, 0, 0);
 630                         pmc->crcount--;
 631                 }
 632                 spin_unlock_bh(&pmc->lock);
 633         }
 634         rcu_read_unlock();
 635
 636         if (!skb)
 637                 return;
 638         (void) igmpv3_sendpack(skb);
 639 }
 640
 641 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 642         int type)
 643 {
 644         struct sk_buff *skb;
 645         struct iphdr *iph;
 646         struct igmphdr *ih;
 647         struct rtable *rt;
 648         struct net_device *dev = in_dev->dev;
 649         struct net *net = dev_net(dev);
 650         __be32  group = pmc ? pmc->multiaddr : 0;
 651         __be32  dst;
 652
 653         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 654                 return igmpv3_send_report(in_dev, pmc);
 655         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 656                 dst = IGMP_ALL_ROUTER;
 657         else
 658                 dst = group;
 659
 660         {
 661                 struct flowi fl = { .oif = dev->ifindex,
 662                                     .fl4_dst = dst,
 663                                     .proto = IPPROTO_IGMP };
 664                 if (ip_route_output_key(net, &rt, &fl))
 665                         return -1;
 666         }
 667         if (rt->rt_src == 0) {
 668                 ip_rt_put(rt);
 669                 return -1;
 670         }
 671
 672         skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 673         if (skb == NULL) {
 674                 ip_rt_put(rt);
 675                 return -1;
 676         }
 677
 678         skb_dst_set(skb, &rt->dst);
 679
 680         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 681
 682         skb_reset_network_header(skb);
 683         iph = ip_hdr(skb);
 684         skb_put(skb, sizeof(struct iphdr) + 4);
 685
 686         iph->version  = 4;
 687         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 688         iph->tos      = 0xc0;
 689         iph->frag_off = htons(IP_DF);
 690         iph->ttl      = 1;
 691         iph->daddr    = dst;
 692         iph->saddr    = rt->rt_src;
 693         iph->protocol = IPPROTO_IGMP;
 694         ip_select_ident(iph, &rt->dst, NULL);
 695         ((u8*)&iph[1])[0] = IPOPT_RA;
 696         ((u8*)&iph[1])[1] = 4;
 697         ((u8*)&iph[1])[2] = 0;
 698         ((u8*)&iph[1])[3] = 0;
 699
 700         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 701         ih->type = type;
 702         ih->code = 0;
 703         ih->csum = 0;
 704         ih->group = group;
 705         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 706
 707         return ip_local_out(skb);
 708 }
 709
 710 static void igmp_gq_timer_expire(unsigned long data)
 711 {
 712         struct in_device *in_dev = (struct in_device *)data;
 713
 714         in_dev->mr_gq_running = 0;
 715         igmpv3_send_report(in_dev, NULL);
 716         __in_dev_put(in_dev);
 717 }
 718
 719 static void igmp_ifc_timer_expire(unsigned long data)
 720 {
 721         struct in_device *in_dev = (struct in_device *)data;
 722
 723         igmpv3_send_cr(in_dev);
 724         if (in_dev->mr_ifc_count) {
 725                 in_dev->mr_ifc_count--;
 726                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 727         }
 728         __in_dev_put(in_dev);
 729 }
 730
 731 static void igmp_ifc_event(struct in_device *in_dev)
 732 {
 733         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 734                 return;
 735         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 736                 IGMP_Unsolicited_Report_Count;
 737         igmp_ifc_start_timer(in_dev, 1);
 738 }
 739
 740
 741 static void igmp_timer_expire(unsigned long data)
 742 {
 743         struct ip_mc_list *im=(struct ip_mc_list *)data;
 744         struct in_device *in_dev = im->interface;
 745
 746         spin_lock(&im->lock);
 747         im->tm_running = 0;
 748
 749         if (im->unsolicit_count) {
 750                 im->unsolicit_count--;
 751                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 752         }
 753         im->reporter = 1;
 754         spin_unlock(&im->lock);
 755
 756         if (IGMP_V1_SEEN(in_dev))
 757                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 758         else if (IGMP_V2_SEEN(in_dev))
 759                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 760         else
 761                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 762
 763         ip_ma_put(im);
 764 }
 765
 766 /* mark EXCLUDE-mode sources */
 767 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 768 {
 769         struct ip_sf_list *psf;
 770         int i, scount;
 771
 772         scount = 0;
 773         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 774                 if (scount == nsrcs)
 775                         break;
 776                 for (i=0; i<nsrcs; i++) {
 777                         /* skip inactive filters */
 778                         if (pmc->sfcount[MCAST_INCLUDE] ||
 779                             pmc->sfcount[MCAST_EXCLUDE] !=
 780                             psf->sf_count[MCAST_EXCLUDE])
 781                                 continue;
 782                         if (srcs[i] == psf->sf_inaddr) {
 783                                 scount++;
 784                                 break;
 785                         }
 786                 }
 787         }
 788         pmc->gsquery = 0;
 789         if (scount == nsrcs)    /* all sources excluded */
 790                 return 0;
 791         return 1;
 792 }
 793
 794 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 795 {
 796         struct ip_sf_list *psf;
 797         int i, scount;
 798
 799         if (pmc->sfmode == MCAST_EXCLUDE)
 800                 return igmp_xmarksources(pmc, nsrcs, srcs);
 801
 802         /* mark INCLUDE-mode sources */
 803         scount = 0;
 804         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 805                 if (scount == nsrcs)
 806                         break;
 807                 for (i=0; i<nsrcs; i++)
 808                         if (srcs[i] == psf->sf_inaddr) {
 809                                 psf->sf_gsresp = 1;
 810                                 scount++;
 811                                 break;
 812                         }
 813         }
 814         if (!scount) {
 815                 pmc->gsquery = 0;
 816                 return 0;
 817         }
 818         pmc->gsquery = 1;
 819         return 1;
 820 }
 821
 822 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 823 {
 824         struct ip_mc_list *im;
 825
 826         /* Timers are only set for non-local groups */
 827
 828         if (group == IGMP_ALL_HOSTS)
 829                 return;
 830
 831         rcu_read_lock();
 832         for_each_pmc_rcu(in_dev, im) {
 833                 if (im->multiaddr == group) {
 834                         igmp_stop_timer(im);
 835                         break;
 836                 }
 837         }
 838         rcu_read_unlock();
 839 }
 840
 841 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 842         int len)
 843 {
 844         struct igmphdr          *ih = igmp_hdr(skb);
 845         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 846         struct ip_mc_list       *im;
 847         __be32                  group = ih->group;
 848         int                     max_delay;
 849         int                     mark = 0;
 850
 851
 852         if (len == 8) {
 853                 if (ih->code == 0) {
 854                         /* Alas, old v1 router presents here. */
 855
 856                         max_delay = IGMP_Query_Response_Interval;
 857                         in_dev->mr_v1_seen = jiffies +
 858                                 IGMP_V1_Router_Present_Timeout;
 859                         group = 0;
 860                 } else {
 861                         /* v2 router present */
 862                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 863                         in_dev->mr_v2_seen = jiffies +
 864                                 IGMP_V2_Router_Present_Timeout;
 865                 }
 866                 /* cancel the interface change timer */
 867                 in_dev->mr_ifc_count = 0;
 868                 if (del_timer(&in_dev->mr_ifc_timer))
 869                         __in_dev_put(in_dev);
 870                 /* clear deleted report items */
 871                 igmpv3_clear_delrec(in_dev);
 872         } else if (len < 12) {
 873                 return; /* ignore bogus packet; freed by caller */
 874         } else if (IGMP_V1_SEEN(in_dev)) {
 875                 /* This is a v3 query with v1 queriers present */
 876                 max_delay = IGMP_Query_Response_Interval;
 877                 group = 0;
 878         } else if (IGMP_V2_SEEN(in_dev)) {
 879                 /* this is a v3 query with v2 queriers present;
 880                  * Interpretation of the max_delay code is problematic here.
 881                  * A real v2 host would use ih_code directly, while v3 has a
 882                  * different encoding. We use the v3 encoding as more likely
 883                  * to be intended in a v3 query.
 884                  */
 885                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 886         } else { /* v3 */
 887                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 888                         return;
 889
 890                 ih3 = igmpv3_query_hdr(skb);
 891                 if (ih3->nsrcs) {
 892                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 893                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 894                                 return;
 895                         ih3 = igmpv3_query_hdr(skb);
 896                 }
 897
 898                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 899                 if (!max_delay)
 900                         max_delay = 1;  /* can't mod w/ 0 */
 901                 in_dev->mr_maxdelay = max_delay;
 902                 if (ih3->qrv)
 903                         in_dev->mr_qrv = ih3->qrv;
 904                 if (!group) { /* general query */
 905                         if (ih3->nsrcs)
 906                                 return; /* no sources allowed */
 907                         igmp_gq_start_timer(in_dev);
 908                         return;
 909                 }
 910                 /* mark sources to include, if group & source-specific */
 911                 mark = ih3->nsrcs != 0;
 912         }
 913
 914         /*
 915          * - Start the timers in all of our membership records
 916          *   that the query applies to for the interface on
 917          *   which the query arrived excl. those that belong
 918          *   to a "local" group (224.0.0.X)
 919          * - For timers already running check if they need to
 920          *   be reset.
 921          * - Use the igmp->igmp_code field as the maximum
 922          *   delay possible
 923          */
 924         rcu_read_lock();
 925         for_each_pmc_rcu(in_dev, im) {
 926                 int changed;
 927
 928                 if (group && group != im->multiaddr)
 929                         continue;
 930                 if (im->multiaddr == IGMP_ALL_HOSTS)
 931                         continue;
 932                 spin_lock_bh(&im->lock);
 933                 if (im->tm_running)
 934                         im->gsquery = im->gsquery && mark;
 935                 else
 936                         im->gsquery = mark;
 937                 changed = !im->gsquery ||
 938                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 939                 spin_unlock_bh(&im->lock);
 940                 if (changed)
 941                         igmp_mod_timer(im, max_delay);
 942         }
 943         rcu_read_unlock();
 944 }
 945
 946 /* called in rcu_read_lock() section */
 947 int igmp_rcv(struct sk_buff *skb)
 948 {
 949         /* This basically follows the spec line by line -- see RFC1112 */
 950         struct igmphdr *ih;
 951         struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
 952         int len = skb->len;
 953
 954         if (in_dev == NULL)
 955                 goto drop;
 956
 957         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 958                 goto drop;
 959
 960         switch (skb->ip_summed) {
 961         case CHECKSUM_COMPLETE:
 962                 if (!csum_fold(skb->csum))
 963                         break;
 964                 /* fall through */
 965         case CHECKSUM_NONE:
 966                 skb->csum = 0;
 967                 if (__skb_checksum_complete(skb))
 968                         goto drop;
 969         }
 970
 971         ih = igmp_hdr(skb);
 972         switch (ih->type) {
 973         case IGMP_HOST_MEMBERSHIP_QUERY:
 974                 igmp_heard_query(in_dev, skb, len);
 975                 break;
 976         case IGMP_HOST_MEMBERSHIP_REPORT:
 977         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 978                 /* Is it our report looped back? */
 979                 if (rt_is_output_route(skb_rtable(skb)))
 980                         break;
 981                 /* don't rely on MC router hearing unicast reports */
 982                 if (skb->pkt_type == PACKET_MULTICAST ||
 983                     skb->pkt_type == PACKET_BROADCAST)
 984                         igmp_heard_report(in_dev, ih->group);
 985                 break;
 986         case IGMP_PIM:
 987 #ifdef CONFIG_IP_PIMSM_V1
 988                 return pim_rcv_v1(skb);
 989 #endif
 990         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 991         case IGMP_DVMRP:
 992         case IGMP_TRACE:
 993         case IGMP_HOST_LEAVE_MESSAGE:
 994         case IGMP_MTRACE:
 995         case IGMP_MTRACE_RESP:
 996                 break;
 997         default:
 998                 break;
 999         }
1000
1001 drop:
1002         kfree_skb(skb);
1003         return 0;
1004 }
1005
1006 #endif
1007
1008
1009 /*
1010  *      Add a filter to a device
1011  */
1012
1013 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1014 {
1015         char buf[MAX_ADDR_LEN];
1016         struct net_device *dev = in_dev->dev;
1017
1018         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1019            We will get multicast token leakage, when IFF_MULTICAST
1020            is changed. This check should be done in dev->set_multicast_list
1021            routine. Something sort of:
1022            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1023            --ANK
1024            */
1025         if (arp_mc_map(addr, buf, dev, 0) == 0)
1026                 dev_mc_add(dev, buf);
1027 }
1028
1029 /*
1030  *      Remove a filter from a device
1031  */
1032
1033 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1034 {
1035         char buf[MAX_ADDR_LEN];
1036         struct net_device *dev = in_dev->dev;
1037
1038         if (arp_mc_map(addr, buf, dev, 0) == 0)
1039                 dev_mc_del(dev, buf);
1040 }
1041
1042 #ifdef CONFIG_IP_MULTICAST
1043 /*
1044  * deleted ip_mc_list manipulation
1045  */
1046 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1047 {
1048         struct ip_mc_list *pmc;
1049
1050         /* this is an "ip_mc_list" for convenience; only the fields below
1051          * are actually used. In particular, the refcnt and users are not
1052          * used for management of the delete list. Using the same structure
1053          * for deleted items allows change reports to use common code with
1054          * non-deleted or query-response MCA's.
1055          */
1056         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1057         if (!pmc)
1058                 return;
1059         spin_lock_bh(&im->lock);
1060         pmc->interface = im->interface;
1061         in_dev_hold(in_dev);
1062         pmc->multiaddr = im->multiaddr;
1063         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1064                 IGMP_Unsolicited_Report_Count;
1065         pmc->sfmode = im->sfmode;
1066         if (pmc->sfmode == MCAST_INCLUDE) {
1067                 struct ip_sf_list *psf;
1068
1069                 pmc->tomb = im->tomb;
1070                 pmc->sources = im->sources;
1071                 im->tomb = im->sources = NULL;
1072                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1073                         psf->sf_crcount = pmc->crcount;
1074         }
1075         spin_unlock_bh(&im->lock);
1076
1077         spin_lock_bh(&in_dev->mc_tomb_lock);
1078         pmc->next = in_dev->mc_tomb;
1079         in_dev->mc_tomb = pmc;
1080         spin_unlock_bh(&in_dev->mc_tomb_lock);
1081 }
1082
1083 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1084 {
1085         struct ip_mc_list *pmc, *pmc_prev;
1086         struct ip_sf_list *psf, *psf_next;
1087
1088         spin_lock_bh(&in_dev->mc_tomb_lock);
1089         pmc_prev = NULL;
1090         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1091                 if (pmc->multiaddr == multiaddr)
1092                         break;
1093                 pmc_prev = pmc;
1094         }
1095         if (pmc) {
1096                 if (pmc_prev)
1097                         pmc_prev->next = pmc->next;
1098                 else
1099                         in_dev->mc_tomb = pmc->next;
1100         }
1101         spin_unlock_bh(&in_dev->mc_tomb_lock);
1102         if (pmc) {
1103                 for (psf=pmc->tomb; psf; psf=psf_next) {
1104                         psf_next = psf->sf_next;
1105                         kfree(psf);
1106                 }
1107                 in_dev_put(pmc->interface);
1108                 kfree(pmc);
1109         }
1110 }
1111
1112 static void igmpv3_clear_delrec(struct in_device *in_dev)
1113 {
1114         struct ip_mc_list *pmc, *nextpmc;
1115
1116         spin_lock_bh(&in_dev->mc_tomb_lock);
1117         pmc = in_dev->mc_tomb;
1118         in_dev->mc_tomb = NULL;
1119         spin_unlock_bh(&in_dev->mc_tomb_lock);
1120
1121         for (; pmc; pmc = nextpmc) {
1122                 nextpmc = pmc->next;
1123                 ip_mc_clear_src(pmc);
1124                 in_dev_put(pmc->interface);
1125                 kfree(pmc);
1126         }
1127         /* clear dead sources, too */
1128         rcu_read_lock();
1129         for_each_pmc_rcu(in_dev, pmc) {
1130                 struct ip_sf_list *psf, *psf_next;
1131
1132                 spin_lock_bh(&pmc->lock);
1133                 psf = pmc->tomb;
1134                 pmc->tomb = NULL;
1135                 spin_unlock_bh(&pmc->lock);
1136                 for (; psf; psf=psf_next) {
1137                         psf_next = psf->sf_next;
1138                         kfree(psf);
1139                 }
1140         }
1141         rcu_read_unlock();
1142 }
1143 #endif
1144
1145 static void igmp_group_dropped(struct ip_mc_list *im)
1146 {
1147         struct in_device *in_dev = im->interface;
1148 #ifdef CONFIG_IP_MULTICAST
1149         int reporter;
1150 #endif
1151
1152         if (im->loaded) {
1153                 im->loaded = 0;
1154                 ip_mc_filter_del(in_dev, im->multiaddr);
1155         }
1156
1157 #ifdef CONFIG_IP_MULTICAST
1158         if (im->multiaddr == IGMP_ALL_HOSTS)
1159                 return;
1160
1161         reporter = im->reporter;
1162         igmp_stop_timer(im);
1163
1164         if (!in_dev->dead) {
1165                 if (IGMP_V1_SEEN(in_dev))
1166                         goto done;
1167                 if (IGMP_V2_SEEN(in_dev)) {
1168                         if (reporter)
1169                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1170                         goto done;
1171                 }
1172                 /* IGMPv3 */
1173                 igmpv3_add_delrec(in_dev, im);
1174
1175                 igmp_ifc_event(in_dev);
1176         }
1177 done:
1178 #endif
1179         ip_mc_clear_src(im);
1180 }
1181
1182 static void igmp_group_added(struct ip_mc_list *im)
1183 {
1184         struct in_device *in_dev = im->interface;
1185
1186         if (im->loaded == 0) {
1187                 im->loaded = 1;
1188                 ip_mc_filter_add(in_dev, im->multiaddr);
1189         }
1190
1191 #ifdef CONFIG_IP_MULTICAST
1192         if (im->multiaddr == IGMP_ALL_HOSTS)
1193                 return;
1194
1195         if (in_dev->dead)
1196                 return;
1197         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1198                 spin_lock_bh(&im->lock);
1199                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1200                 spin_unlock_bh(&im->lock);
1201                 return;
1202         }
1203         /* else, v3 */
1204
1205         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1206                 IGMP_Unsolicited_Report_Count;
1207         igmp_ifc_event(in_dev);
1208 #endif
1209 }
1210
1211
1212 /*
1213  *      Multicast list managers
1214  */
1215
1216
1217 /*
1218  *      A socket has joined a multicast group on device dev.
1219  */
1220
1221 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1222 {
1223         struct ip_mc_list *im;
1224
1225         ASSERT_RTNL();
1226
1227         for_each_pmc_rtnl(in_dev, im) {
1228                 if (im->multiaddr == addr) {
1229                         im->users++;
1230                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1231                         goto out;
1232                 }
1233         }
1234
1235         im = kzalloc(sizeof(*im), GFP_KERNEL);
1236         if (!im)
1237                 goto out;
1238
1239         im->users = 1;
1240         im->interface = in_dev;
1241         in_dev_hold(in_dev);
1242         im->multiaddr = addr;
1243         /* initial mode is (EX, empty) */
1244         im->sfmode = MCAST_EXCLUDE;
1245         im->sfcount[MCAST_EXCLUDE] = 1;
1246         atomic_set(&im->refcnt, 1);
1247         spin_lock_init(&im->lock);
1248 #ifdef CONFIG_IP_MULTICAST
1249         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1250         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1251 #endif
1252
1253         im->next_rcu = in_dev->mc_list;
1254         in_dev->mc_count++;
1255         rcu_assign_pointer(in_dev->mc_list, im);
1256
1257 #ifdef CONFIG_IP_MULTICAST
1258         igmpv3_del_delrec(in_dev, im->multiaddr);
1259 #endif
1260         igmp_group_added(im);
1261         if (!in_dev->dead)
1262                 ip_rt_multicast_event(in_dev);
1263 out:
1264         return;
1265 }
1266 EXPORT_SYMBOL(ip_mc_inc_group);
1267
1268 /*
1269  *      Resend IGMP JOIN report; used for bonding.
1270  */
1271 void ip_mc_rejoin_group(struct ip_mc_list *im)
1272 {
1273 #ifdef CONFIG_IP_MULTICAST
1274         struct in_device *in_dev = im->interface;
1275
1276         if (im->multiaddr == IGMP_ALL_HOSTS)
1277                 return;
1278
1279         /* a failover is happening and switches
1280          * must be notified immediately */
1281         if (IGMP_V1_SEEN(in_dev))
1282                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
1283         else if (IGMP_V2_SEEN(in_dev))
1284                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
1285         else
1286                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
1287 #endif
1288 }
1289 EXPORT_SYMBOL(ip_mc_rejoin_group);
1290
1291 /*
1292  *      A socket has left a multicast group on device dev
1293  */
1294
1295 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1296 {
1297         struct ip_mc_list *i;
1298         struct ip_mc_list __rcu **ip;
1299
1300         ASSERT_RTNL();
1301
1302         for (ip = &in_dev->mc_list;
1303              (i = rtnl_dereference(*ip)) != NULL;
1304              ip = &i->next_rcu) {
1305                 if (i->multiaddr == addr) {
1306                         if (--i->users == 0) {
1307                                 *ip = i->next_rcu;
1308                                 in_dev->mc_count--;
1309                                 igmp_group_dropped(i);
1310
1311                                 if (!in_dev->dead)
1312                                         ip_rt_multicast_event(in_dev);
1313
1314                                 ip_ma_put(i);
1315                                 return;
1316                         }
1317                         break;
1318                 }
1319         }
1320 }
1321 EXPORT_SYMBOL(ip_mc_dec_group);
1322
1323 /* Device changing type */
1324
1325 void ip_mc_unmap(struct in_device *in_dev)
1326 {
1327         struct ip_mc_list *pmc;
1328
1329         ASSERT_RTNL();
1330
1331         for_each_pmc_rtnl(in_dev, pmc)
1332                 igmp_group_dropped(pmc);
1333 }
1334
1335 void ip_mc_remap(struct in_device *in_dev)
1336 {
1337         struct ip_mc_list *pmc;
1338
1339         ASSERT_RTNL();
1340
1341         for_each_pmc_rtnl(in_dev, pmc)
1342                 igmp_group_added(pmc);
1343 }
1344
1345 /* Device going down */
1346
1347 void ip_mc_down(struct in_device *in_dev)
1348 {
1349         struct ip_mc_list *pmc;
1350
1351         ASSERT_RTNL();
1352
1353         for_each_pmc_rtnl(in_dev, pmc)
1354                 igmp_group_dropped(pmc);
1355
1356 #ifdef CONFIG_IP_MULTICAST
1357         in_dev->mr_ifc_count = 0;
1358         if (del_timer(&in_dev->mr_ifc_timer))
1359                 __in_dev_put(in_dev);
1360         in_dev->mr_gq_running = 0;
1361         if (del_timer(&in_dev->mr_gq_timer))
1362                 __in_dev_put(in_dev);
1363         igmpv3_clear_delrec(in_dev);
1364 #endif
1365
1366         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1367 }
1368
1369 void ip_mc_init_dev(struct in_device *in_dev)
1370 {
1371         ASSERT_RTNL();
1372
1373         in_dev->mc_tomb = NULL;
1374 #ifdef CONFIG_IP_MULTICAST
1375         in_dev->mr_gq_running = 0;
1376         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1377                         (unsigned long)in_dev);
1378         in_dev->mr_ifc_count = 0;
1379         in_dev->mc_count     = 0;
1380         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1381                         (unsigned long)in_dev);
1382         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1383 #endif
1384
1385         spin_lock_init(&in_dev->mc_tomb_lock);
1386 }
1387
1388 /* Device going up */
1389
1390 void ip_mc_up(struct in_device *in_dev)
1391 {
1392         struct ip_mc_list *pmc;
1393
1394         ASSERT_RTNL();
1395
1396         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1397
1398         for_each_pmc_rtnl(in_dev, pmc)
1399                 igmp_group_added(pmc);
1400 }
1401
1402 /*
1403  *      Device is about to be destroyed: clean up.
1404  */
1405
1406 void ip_mc_destroy_dev(struct in_device *in_dev)
1407 {
1408         struct ip_mc_list *i;
1409
1410         ASSERT_RTNL();
1411
1412         /* Deactivate timers */
1413         ip_mc_down(in_dev);
1414
1415         while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1416                 in_dev->mc_list = i->next_rcu;
1417                 in_dev->mc_count--;
1418
1419                 igmp_group_dropped(i);
1420                 ip_ma_put(i);
1421         }
1422 }
1423
1424 /* RTNL is locked */
1425 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1426 {
1427         struct flowi fl = { .fl4_dst = imr->imr_multiaddr.s_addr };
1428         struct rtable *rt;
1429         struct net_device *dev = NULL;
1430         struct in_device *idev = NULL;
1431
1432         if (imr->imr_ifindex) {
1433                 idev = inetdev_by_index(net, imr->imr_ifindex);
1434                 return idev;
1435         }
1436         if (imr->imr_address.s_addr) {
1437                 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1438                 if (!dev)
1439                         return NULL;
1440         }
1441
1442         if (!dev && !ip_route_output_key(net, &rt, &fl)) {
1443                 dev = rt->dst.dev;
1444                 ip_rt_put(rt);
1445         }
1446         if (dev) {
1447                 imr->imr_ifindex = dev->ifindex;
1448                 idev = __in_dev_get_rtnl(dev);
1449         }
1450         return idev;
1451 }
1452
1453 /*
1454  *      Join a socket to a group
1455  */
1456 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1457 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1458
1459
1460 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1461         __be32 *psfsrc)
1462 {
1463         struct ip_sf_list *psf, *psf_prev;
1464         int rv = 0;
1465
1466         psf_prev = NULL;
1467         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1468                 if (psf->sf_inaddr == *psfsrc)
1469                         break;
1470                 psf_prev = psf;
1471         }
1472         if (!psf || psf->sf_count[sfmode] == 0) {
1473                 /* source filter not found, or count wrong =>  bug */
1474                 return -ESRCH;
1475         }
1476         psf->sf_count[sfmode]--;
1477         if (psf->sf_count[sfmode] == 0) {
1478                 ip_rt_multicast_event(pmc->interface);
1479         }
1480         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1481 #ifdef CONFIG_IP_MULTICAST
1482                 struct in_device *in_dev = pmc->interface;
1483 #endif
1484
1485                 /* no more filters for this source */
1486                 if (psf_prev)
1487                         psf_prev->sf_next = psf->sf_next;
1488                 else
1489                         pmc->sources = psf->sf_next;
1490 #ifdef CONFIG_IP_MULTICAST
1491                 if (psf->sf_oldin &&
1492                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1493                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1494                                 IGMP_Unsolicited_Report_Count;
1495                         psf->sf_next = pmc->tomb;
1496                         pmc->tomb = psf;
1497                         rv = 1;
1498                 } else
1499 #endif
1500                         kfree(psf);
1501         }
1502         return rv;
1503 }
1504
1505 #ifndef CONFIG_IP_MULTICAST
1506 #define igmp_ifc_event(x)       do { } while (0)
1507 #endif
1508
1509 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1510                          int sfcount, __be32 *psfsrc, int delta)
1511 {
1512         struct ip_mc_list *pmc;
1513         int     changerec = 0;
1514         int     i, err;
1515
1516         if (!in_dev)
1517                 return -ENODEV;
1518         rcu_read_lock();
1519         for_each_pmc_rcu(in_dev, pmc) {
1520                 if (*pmca == pmc->multiaddr)
1521                         break;
1522         }
1523         if (!pmc) {
1524                 /* MCA not found?? bug */
1525                 rcu_read_unlock();
1526                 return -ESRCH;
1527         }
1528         spin_lock_bh(&pmc->lock);
1529         rcu_read_unlock();
1530 #ifdef CONFIG_IP_MULTICAST
1531         sf_markstate(pmc);
1532 #endif
1533         if (!delta) {
1534                 err = -EINVAL;
1535                 if (!pmc->sfcount[sfmode])
1536                         goto out_unlock;
1537                 pmc->sfcount[sfmode]--;
1538         }
1539         err = 0;
1540         for (i=0; i<sfcount; i++) {
1541                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1542
1543                 changerec |= rv > 0;
1544                 if (!err && rv < 0)
1545                         err = rv;
1546         }
1547         if (pmc->sfmode == MCAST_EXCLUDE &&
1548             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1549             pmc->sfcount[MCAST_INCLUDE]) {
1550 #ifdef CONFIG_IP_MULTICAST
1551                 struct ip_sf_list *psf;
1552 #endif
1553
1554                 /* filter mode change */
1555                 pmc->sfmode = MCAST_INCLUDE;
1556 #ifdef CONFIG_IP_MULTICAST
1557                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1558                         IGMP_Unsolicited_Report_Count;
1559                 in_dev->mr_ifc_count = pmc->crcount;
1560                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1561                         psf->sf_crcount = 0;
1562                 igmp_ifc_event(pmc->interface);
1563         } else if (sf_setstate(pmc) || changerec) {
1564                 igmp_ifc_event(pmc->interface);
1565 #endif
1566         }
1567 out_unlock:
1568         spin_unlock_bh(&pmc->lock);
1569         return err;
1570 }
1571
1572 /*
1573  * Add multicast single-source filter to the interface list
1574  */
1575 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1576         __be32 *psfsrc, int delta)
1577 {
1578         struct ip_sf_list *psf, *psf_prev;
1579
1580         psf_prev = NULL;
1581         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1582                 if (psf->sf_inaddr == *psfsrc)
1583                         break;
1584                 psf_prev = psf;
1585         }
1586         if (!psf) {
1587                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1588                 if (!psf)
1589                         return -ENOBUFS;
1590                 psf->sf_inaddr = *psfsrc;
1591                 if (psf_prev) {
1592                         psf_prev->sf_next = psf;
1593                 } else
1594                         pmc->sources = psf;
1595         }
1596         psf->sf_count[sfmode]++;
1597         if (psf->sf_count[sfmode] == 1) {
1598                 ip_rt_multicast_event(pmc->interface);
1599         }
1600         return 0;
1601 }
1602
1603 #ifdef CONFIG_IP_MULTICAST
1604 static void sf_markstate(struct ip_mc_list *pmc)
1605 {
1606         struct ip_sf_list *psf;
1607         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1608
1609         for (psf=pmc->sources; psf; psf=psf->sf_next)
1610                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1611                         psf->sf_oldin = mca_xcount ==
1612                                 psf->sf_count[MCAST_EXCLUDE] &&
1613                                 !psf->sf_count[MCAST_INCLUDE];
1614                 } else
1615                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1616 }
1617
1618 static int sf_setstate(struct ip_mc_list *pmc)
1619 {
1620         struct ip_sf_list *psf, *dpsf;
1621         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1622         int qrv = pmc->interface->mr_qrv;
1623         int new_in, rv;
1624
1625         rv = 0;
1626         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1627                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1628                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1629                                 !psf->sf_count[MCAST_INCLUDE];
1630                 } else
1631                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1632                 if (new_in) {
1633                         if (!psf->sf_oldin) {
1634                                 struct ip_sf_list *prev = NULL;
1635
1636                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1637                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1638                                                 break;
1639                                         prev = dpsf;
1640                                 }
1641                                 if (dpsf) {
1642                                         if (prev)
1643                                                 prev->sf_next = dpsf->sf_next;
1644                                         else
1645                                                 pmc->tomb = dpsf->sf_next;
1646                                         kfree(dpsf);
1647                                 }
1648                                 psf->sf_crcount = qrv;
1649                                 rv++;
1650                         }
1651                 } else if (psf->sf_oldin) {
1652
1653                         psf->sf_crcount = 0;
1654                         /*
1655                          * add or update "delete" records if an active filter
1656                          * is now inactive
1657                          */
1658                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1659                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1660                                         break;
1661                         if (!dpsf) {
1662                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1663                                 if (!dpsf)
1664                                         continue;
1665                                 *dpsf = *psf;
1666                                 /* pmc->lock held by callers */
1667                                 dpsf->sf_next = pmc->tomb;
1668                                 pmc->tomb = dpsf;
1669                         }
1670                         dpsf->sf_crcount = qrv;
1671                         rv++;
1672                 }
1673         }
1674         return rv;
1675 }
1676 #endif
1677
1678 /*
1679  * Add multicast source filter list to the interface list
1680  */
1681 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1682                          int sfcount, __be32 *psfsrc, int delta)
1683 {
1684         struct ip_mc_list *pmc;
1685         int     isexclude;
1686         int     i, err;
1687
1688         if (!in_dev)
1689                 return -ENODEV;
1690         rcu_read_lock();
1691         for_each_pmc_rcu(in_dev, pmc) {
1692                 if (*pmca == pmc->multiaddr)
1693                         break;
1694         }
1695         if (!pmc) {
1696                 /* MCA not found?? bug */
1697                 rcu_read_unlock();
1698                 return -ESRCH;
1699         }
1700         spin_lock_bh(&pmc->lock);
1701         rcu_read_unlock();
1702
1703 #ifdef CONFIG_IP_MULTICAST
1704         sf_markstate(pmc);
1705 #endif
1706         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1707         if (!delta)
1708                 pmc->sfcount[sfmode]++;
1709         err = 0;
1710         for (i=0; i<sfcount; i++) {
1711                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1712                 if (err)
1713                         break;
1714         }
1715         if (err) {
1716                 int j;
1717
1718                 pmc->sfcount[sfmode]--;
1719                 for (j=0; j<i; j++)
1720                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1721         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1722 #ifdef CONFIG_IP_MULTICAST
1723                 struct ip_sf_list *psf;
1724                 in_dev = pmc->interface;
1725 #endif
1726
1727                 /* filter mode change */
1728                 if (pmc->sfcount[MCAST_EXCLUDE])
1729                         pmc->sfmode = MCAST_EXCLUDE;
1730                 else if (pmc->sfcount[MCAST_INCLUDE])
1731                         pmc->sfmode = MCAST_INCLUDE;
1732 #ifdef CONFIG_IP_MULTICAST
1733                 /* else no filters; keep old mode for reports */
1734
1735                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1736                         IGMP_Unsolicited_Report_Count;
1737                 in_dev->mr_ifc_count = pmc->crcount;
1738                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1739                         psf->sf_crcount = 0;
1740                 igmp_ifc_event(in_dev);
1741         } else if (sf_setstate(pmc)) {
1742                 igmp_ifc_event(in_dev);
1743 #endif
1744         }
1745         spin_unlock_bh(&pmc->lock);
1746         return err;
1747 }
1748
1749 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1750 {
1751         struct ip_sf_list *psf, *nextpsf;
1752
1753         for (psf=pmc->tomb; psf; psf=nextpsf) {
1754                 nextpsf = psf->sf_next;
1755                 kfree(psf);
1756         }
1757         pmc->tomb = NULL;
1758         for (psf=pmc->sources; psf; psf=nextpsf) {
1759                 nextpsf = psf->sf_next;
1760                 kfree(psf);
1761         }
1762         pmc->sources = NULL;
1763         pmc->sfmode = MCAST_EXCLUDE;
1764         pmc->sfcount[MCAST_INCLUDE] = 0;
1765         pmc->sfcount[MCAST_EXCLUDE] = 1;
1766 }
1767
1768
1769 /*
1770  * Join a multicast group
1771  */
1772 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1773 {
1774         int err;
1775         __be32 addr = imr->imr_multiaddr.s_addr;
1776         struct ip_mc_socklist *iml = NULL, *i;
1777         struct in_device *in_dev;
1778         struct inet_sock *inet = inet_sk(sk);
1779         struct net *net = sock_net(sk);
1780         int ifindex;
1781         int count = 0;
1782
1783         if (!ipv4_is_multicast(addr))
1784                 return -EINVAL;
1785
1786         rtnl_lock();
1787
1788         in_dev = ip_mc_find_dev(net, imr);
1789
1790         if (!in_dev) {
1791                 iml = NULL;
1792                 err = -ENODEV;
1793                 goto done;
1794         }
1795
1796         err = -EADDRINUSE;
1797         ifindex = imr->imr_ifindex;
1798         for_each_pmc_rtnl(inet, i) {
1799                 if (i->multi.imr_multiaddr.s_addr == addr &&
1800                     i->multi.imr_ifindex == ifindex)
1801                         goto done;
1802                 count++;
1803         }
1804         err = -ENOBUFS;
1805         if (count >= sysctl_igmp_max_memberships)
1806                 goto done;
1807         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1808         if (iml == NULL)
1809                 goto done;
1810
1811         memcpy(&iml->multi, imr, sizeof(*imr));
1812         iml->next_rcu = inet->mc_list;
1813         iml->sflist = NULL;
1814         iml->sfmode = MCAST_EXCLUDE;
1815         rcu_assign_pointer(inet->mc_list, iml);
1816         ip_mc_inc_group(in_dev, addr);
1817         err = 0;
1818 done:
1819         rtnl_unlock();
1820         return err;
1821 }
1822 EXPORT_SYMBOL(ip_mc_join_group);
1823
1824 static void ip_sf_socklist_reclaim(struct rcu_head *rp)
1825 {
1826         kfree(container_of(rp, struct ip_sf_socklist, rcu));
1827         /* sk_omem_alloc should have been decreased by the caller*/
1828 }
1829
1830 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1831                            struct in_device *in_dev)
1832 {
1833         struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1834         int err;
1835
1836         if (psf == NULL) {
1837                 /* any-source empty exclude case */
1838                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1839                         iml->sfmode, 0, NULL, 0);
1840         }
1841         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1842                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1843         rcu_assign_pointer(iml->sflist, NULL);
1844         /* decrease mem now to avoid the memleak warning */
1845         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1846         call_rcu(&psf->rcu, ip_sf_socklist_reclaim);
1847         return err;
1848 }
1849
1850
1851 static void ip_mc_socklist_reclaim(struct rcu_head *rp)
1852 {
1853         kfree(container_of(rp, struct ip_mc_socklist, rcu));
1854         /* sk_omem_alloc should have been decreased by the caller*/
1855 }
1856
1857
1858 /*
1859  *      Ask a socket to leave a group.
1860  */
1861
1862 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1863 {
1864         struct inet_sock *inet = inet_sk(sk);
1865         struct ip_mc_socklist *iml;
1866         struct ip_mc_socklist __rcu **imlp;
1867         struct in_device *in_dev;
1868         struct net *net = sock_net(sk);
1869         __be32 group = imr->imr_multiaddr.s_addr;
1870         u32 ifindex;
1871         int ret = -EADDRNOTAVAIL;
1872
1873         rtnl_lock();
1874         in_dev = ip_mc_find_dev(net, imr);
1875         ifindex = imr->imr_ifindex;
1876         for (imlp = &inet->mc_list;
1877              (iml = rtnl_dereference(*imlp)) != NULL;
1878              imlp = &iml->next_rcu) {
1879                 if (iml->multi.imr_multiaddr.s_addr != group)
1880                         continue;
1881                 if (ifindex) {
1882                         if (iml->multi.imr_ifindex != ifindex)
1883                                 continue;
1884                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1885                                 iml->multi.imr_address.s_addr)
1886                         continue;
1887
1888                 (void) ip_mc_leave_src(sk, iml, in_dev);
1889
1890                 *imlp = iml->next_rcu;
1891
1892                 if (in_dev)
1893                         ip_mc_dec_group(in_dev, group);
1894                 rtnl_unlock();
1895                 /* decrease mem now to avoid the memleak warning */
1896                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1897                 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
1898                 return 0;
1899         }
1900         if (!in_dev)
1901                 ret = -ENODEV;
1902         rtnl_unlock();
1903         return ret;
1904 }
1905
1906 int ip_mc_source(int add, int omode, struct sock *sk, struct
1907         ip_mreq_source *mreqs, int ifindex)
1908 {
1909         int err;
1910         struct ip_mreqn imr;
1911         __be32 addr = mreqs->imr_multiaddr;
1912         struct ip_mc_socklist *pmc;
1913         struct in_device *in_dev = NULL;
1914         struct inet_sock *inet = inet_sk(sk);
1915         struct ip_sf_socklist *psl;
1916         struct net *net = sock_net(sk);
1917         int leavegroup = 0;
1918         int i, j, rv;
1919
1920         if (!ipv4_is_multicast(addr))
1921                 return -EINVAL;
1922
1923         rtnl_lock();
1924
1925         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1926         imr.imr_address.s_addr = mreqs->imr_interface;
1927         imr.imr_ifindex = ifindex;
1928         in_dev = ip_mc_find_dev(net, &imr);
1929
1930         if (!in_dev) {
1931                 err = -ENODEV;
1932                 goto done;
1933         }
1934         err = -EADDRNOTAVAIL;
1935
1936         for_each_pmc_rtnl(inet, pmc) {
1937                 if ((pmc->multi.imr_multiaddr.s_addr ==
1938                      imr.imr_multiaddr.s_addr) &&
1939                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
1940                         break;
1941         }
1942         if (!pmc) {             /* must have a prior join */
1943                 err = -EINVAL;
1944                 goto done;
1945         }
1946         /* if a source filter was set, must be the same mode as before */
1947         if (pmc->sflist) {
1948                 if (pmc->sfmode != omode) {
1949                         err = -EINVAL;
1950                         goto done;
1951                 }
1952         } else if (pmc->sfmode != omode) {
1953                 /* allow mode switches for empty-set filters */
1954                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1955                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1956                         NULL, 0);
1957                 pmc->sfmode = omode;
1958         }
1959
1960         psl = rtnl_dereference(pmc->sflist);
1961         if (!add) {
1962                 if (!psl)
1963                         goto done;      /* err = -EADDRNOTAVAIL */
1964                 rv = !0;
1965                 for (i=0; i<psl->sl_count; i++) {
1966                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1967                                 sizeof(__be32));
1968                         if (rv == 0)
1969                                 break;
1970                 }
1971                 if (rv)         /* source not found */
1972                         goto done;      /* err = -EADDRNOTAVAIL */
1973
1974                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1975                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1976                         leavegroup = 1;
1977                         goto done;
1978                 }
1979
1980                 /* update the interface filter */
1981                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1982                         &mreqs->imr_sourceaddr, 1);
1983
1984                 for (j=i+1; j<psl->sl_count; j++)
1985                         psl->sl_addr[j-1] = psl->sl_addr[j];
1986                 psl->sl_count--;
1987                 err = 0;
1988                 goto done;
1989         }
1990         /* else, add a new source to the filter */
1991
1992         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1993                 err = -ENOBUFS;
1994                 goto done;
1995         }
1996         if (!psl || psl->sl_count == psl->sl_max) {
1997                 struct ip_sf_socklist *newpsl;
1998                 int count = IP_SFBLOCK;
1999
2000                 if (psl)
2001                         count += psl->sl_max;
2002                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2003                 if (!newpsl) {
2004                         err = -ENOBUFS;
2005                         goto done;
2006                 }
2007                 newpsl->sl_max = count;
2008                 newpsl->sl_count = count - IP_SFBLOCK;
2009                 if (psl) {
2010                         for (i=0; i<psl->sl_count; i++)
2011                                 newpsl->sl_addr[i] = psl->sl_addr[i];
2012                         /* decrease mem now to avoid the memleak warning */
2013                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2014                         call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2015                 }
2016                 rcu_assign_pointer(pmc->sflist, newpsl);
2017                 psl = newpsl;
2018         }
2019         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2020         for (i=0; i<psl->sl_count; i++) {
2021                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2022                         sizeof(__be32));
2023                 if (rv == 0)
2024                         break;
2025         }
2026         if (rv == 0)            /* address already there is an error */
2027                 goto done;
2028         for (j=psl->sl_count-1; j>=i; j--)
2029                 psl->sl_addr[j+1] = psl->sl_addr[j];
2030         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2031         psl->sl_count++;
2032         err = 0;
2033         /* update the interface list */
2034         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2035                 &mreqs->imr_sourceaddr, 1);
2036 done:
2037         rtnl_unlock();
2038         if (leavegroup)
2039                 return ip_mc_leave_group(sk, &imr);
2040         return err;
2041 }
2042
2043 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2044 {
2045         int err = 0;
2046         struct ip_mreqn imr;
2047         __be32 addr = msf->imsf_multiaddr;
2048         struct ip_mc_socklist *pmc;
2049         struct in_device *in_dev;
2050         struct inet_sock *inet = inet_sk(sk);
2051         struct ip_sf_socklist *newpsl, *psl;
2052         struct net *net = sock_net(sk);
2053         int leavegroup = 0;
2054
2055         if (!ipv4_is_multicast(addr))
2056                 return -EINVAL;
2057         if (msf->imsf_fmode != MCAST_INCLUDE &&
2058             msf->imsf_fmode != MCAST_EXCLUDE)
2059                 return -EINVAL;
2060
2061         rtnl_lock();
2062
2063         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2064         imr.imr_address.s_addr = msf->imsf_interface;
2065         imr.imr_ifindex = ifindex;
2066         in_dev = ip_mc_find_dev(net, &imr);
2067
2068         if (!in_dev) {
2069                 err = -ENODEV;
2070                 goto done;
2071         }
2072
2073         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2074         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2075                 leavegroup = 1;
2076                 goto done;
2077         }
2078
2079         for_each_pmc_rtnl(inet, pmc) {
2080                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2081                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2082                         break;
2083         }
2084         if (!pmc) {             /* must have a prior join */
2085                 err = -EINVAL;
2086                 goto done;
2087         }
2088         if (msf->imsf_numsrc) {
2089                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2090                                                            GFP_KERNEL);
2091                 if (!newpsl) {
2092                         err = -ENOBUFS;
2093                         goto done;
2094                 }
2095                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2096                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2097                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2098                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2099                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2100                 if (err) {
2101                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2102                         goto done;
2103                 }
2104         } else {
2105                 newpsl = NULL;
2106                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2107                                      msf->imsf_fmode, 0, NULL, 0);
2108         }
2109         psl = rtnl_dereference(pmc->sflist);
2110         if (psl) {
2111                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2112                         psl->sl_count, psl->sl_addr, 0);
2113                 /* decrease mem now to avoid the memleak warning */
2114                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2115                 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2116         } else
2117                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2118                         0, NULL, 0);
2119         rcu_assign_pointer(pmc->sflist, newpsl);
2120         pmc->sfmode = msf->imsf_fmode;
2121         err = 0;
2122 done:
2123         rtnl_unlock();
2124         if (leavegroup)
2125                 err = ip_mc_leave_group(sk, &imr);
2126         return err;
2127 }
2128
2129 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2130         struct ip_msfilter __user *optval, int __user *optlen)
2131 {
2132         int err, len, count, copycount;
2133         struct ip_mreqn imr;
2134         __be32 addr = msf->imsf_multiaddr;
2135         struct ip_mc_socklist *pmc;
2136         struct in_device *in_dev;
2137         struct inet_sock *inet = inet_sk(sk);
2138         struct ip_sf_socklist *psl;
2139         struct net *net = sock_net(sk);
2140
2141         if (!ipv4_is_multicast(addr))
2142                 return -EINVAL;
2143
2144         rtnl_lock();
2145
2146         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2147         imr.imr_address.s_addr = msf->imsf_interface;
2148         imr.imr_ifindex = 0;
2149         in_dev = ip_mc_find_dev(net, &imr);
2150
2151         if (!in_dev) {
2152                 err = -ENODEV;
2153                 goto done;
2154         }
2155         err = -EADDRNOTAVAIL;
2156
2157         for_each_pmc_rtnl(inet, pmc) {
2158                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2159                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2160                         break;
2161         }
2162         if (!pmc)               /* must have a prior join */
2163                 goto done;
2164         msf->imsf_fmode = pmc->sfmode;
2165         psl = rtnl_dereference(pmc->sflist);
2166         rtnl_unlock();
2167         if (!psl) {
2168                 len = 0;
2169                 count = 0;
2170         } else {
2171                 count = psl->sl_count;
2172         }
2173         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2174         len = copycount * sizeof(psl->sl_addr[0]);
2175         msf->imsf_numsrc = count;
2176         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2177             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2178                 return -EFAULT;
2179         }
2180         if (len &&
2181             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2182                 return -EFAULT;
2183         return 0;
2184 done:
2185         rtnl_unlock();
2186         return err;
2187 }
2188
2189 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2190         struct group_filter __user *optval, int __user *optlen)
2191 {
2192         int err, i, count, copycount;
2193         struct sockaddr_in *psin;
2194         __be32 addr;
2195         struct ip_mc_socklist *pmc;
2196         struct inet_sock *inet = inet_sk(sk);
2197         struct ip_sf_socklist *psl;
2198
2199         psin = (struct sockaddr_in *)&gsf->gf_group;
2200         if (psin->sin_family != AF_INET)
2201                 return -EINVAL;
2202         addr = psin->sin_addr.s_addr;
2203         if (!ipv4_is_multicast(addr))
2204                 return -EINVAL;
2205
2206         rtnl_lock();
2207
2208         err = -EADDRNOTAVAIL;
2209
2210         for_each_pmc_rtnl(inet, pmc) {
2211                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2212                     pmc->multi.imr_ifindex == gsf->gf_interface)
2213                         break;
2214         }
2215         if (!pmc)               /* must have a prior join */
2216                 goto done;
2217         gsf->gf_fmode = pmc->sfmode;
2218         psl = rtnl_dereference(pmc->sflist);
2219         rtnl_unlock();
2220         count = psl ? psl->sl_count : 0;
2221         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2222         gsf->gf_numsrc = count;
2223         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2224             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2225                 return -EFAULT;
2226         }
2227         for (i=0; i<copycount; i++) {
2228                 struct sockaddr_storage ss;
2229
2230                 psin = (struct sockaddr_in *)&ss;
2231                 memset(&ss, 0, sizeof(ss));
2232                 psin->sin_family = AF_INET;
2233                 psin->sin_addr.s_addr = psl->sl_addr[i];
2234                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2235                         return -EFAULT;
2236         }
2237         return 0;
2238 done:
2239         rtnl_unlock();
2240         return err;
2241 }
2242
2243 /*
2244  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2245  */
2246 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2247 {
2248         struct inet_sock *inet = inet_sk(sk);
2249         struct ip_mc_socklist *pmc;
2250         struct ip_sf_socklist *psl;
2251         int i;
2252         int ret;
2253
2254         ret = 1;
2255         if (!ipv4_is_multicast(loc_addr))
2256                 goto out;
2257
2258         rcu_read_lock();
2259         for_each_pmc_rcu(inet, pmc) {
2260                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2261                     pmc->multi.imr_ifindex == dif)
2262                         break;
2263         }
2264         ret = inet->mc_all;
2265         if (!pmc)
2266                 goto unlock;
2267         psl = rcu_dereference(pmc->sflist);
2268         ret = (pmc->sfmode == MCAST_EXCLUDE);
2269         if (!psl)
2270                 goto unlock;
2271
2272         for (i=0; i<psl->sl_count; i++) {
2273                 if (psl->sl_addr[i] == rmt_addr)
2274                         break;
2275         }
2276         ret = 0;
2277         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2278                 goto unlock;
2279         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2280                 goto unlock;
2281         ret = 1;
2282 unlock:
2283         rcu_read_unlock();
2284 out:
2285         return ret;
2286 }
2287
2288 /*
2289  *      A socket is closing.
2290  */
2291
2292 void ip_mc_drop_socket(struct sock *sk)
2293 {
2294         struct inet_sock *inet = inet_sk(sk);
2295         struct ip_mc_socklist *iml;
2296         struct net *net = sock_net(sk);
2297
2298         if (inet->mc_list == NULL)
2299                 return;
2300
2301         rtnl_lock();
2302         while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2303                 struct in_device *in_dev;
2304
2305                 inet->mc_list = iml->next_rcu;
2306                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2307                 (void) ip_mc_leave_src(sk, iml, in_dev);
2308                 if (in_dev != NULL)
2309                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2310                 /* decrease mem now to avoid the memleak warning */
2311                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2312                 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
2313         }
2314         rtnl_unlock();
2315 }
2316
2317 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2318 {
2319         struct ip_mc_list *im;
2320         struct ip_sf_list *psf;
2321         int rv = 0;
2322
2323         rcu_read_lock();
2324         for_each_pmc_rcu(in_dev, im) {
2325                 if (im->multiaddr == mc_addr)
2326                         break;
2327         }
2328         if (im && proto == IPPROTO_IGMP) {
2329                 rv = 1;
2330         } else if (im) {
2331                 if (src_addr) {
2332                         for (psf=im->sources; psf; psf=psf->sf_next) {
2333                                 if (psf->sf_inaddr == src_addr)
2334                                         break;
2335                         }
2336                         if (psf)
2337                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2338                                         psf->sf_count[MCAST_EXCLUDE] !=
2339                                         im->sfcount[MCAST_EXCLUDE];
2340                         else
2341                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2342                 } else
2343                         rv = 1; /* unspecified source; tentatively allow */
2344         }
2345         rcu_read_unlock();
2346         return rv;
2347 }
2348
2349 #if defined(CONFIG_PROC_FS)
2350 struct igmp_mc_iter_state {
2351         struct seq_net_private p;
2352         struct net_device *dev;
2353         struct in_device *in_dev;
2354 };
2355
2356 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2357
2358 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2359 {
2360         struct net *net = seq_file_net(seq);
2361         struct ip_mc_list *im = NULL;
2362         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2363
2364         state->in_dev = NULL;
2365         for_each_netdev_rcu(net, state->dev) {
2366                 struct in_device *in_dev;
2367
2368                 in_dev = __in_dev_get_rcu(state->dev);
2369                 if (!in_dev)
2370                         continue;
2371                 im = rcu_dereference(in_dev->mc_list);
2372                 if (im) {
2373                         state->in_dev = in_dev;
2374                         break;
2375                 }
2376         }
2377         return im;
2378 }
2379
2380 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2381 {
2382         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2383
2384         im = rcu_dereference(im->next_rcu);
2385         while (!im) {
2386                 state->dev = next_net_device_rcu(state->dev);
2387                 if (!state->dev) {
2388                         state->in_dev = NULL;
2389                         break;
2390                 }
2391                 state->in_dev = __in_dev_get_rcu(state->dev);
2392                 if (!state->in_dev)
2393                         continue;
2394                 im = rcu_dereference(state->in_dev->mc_list);
2395         }
2396         return im;
2397 }
2398
2399 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2400 {
2401         struct ip_mc_list *im = igmp_mc_get_first(seq);
2402         if (im)
2403                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2404                         --pos;
2405         return pos ? NULL : im;
2406 }
2407
2408 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2409         __acquires(rcu)
2410 {
2411         rcu_read_lock();
2412         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2413 }
2414
2415 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2416 {
2417         struct ip_mc_list *im;
2418         if (v == SEQ_START_TOKEN)
2419                 im = igmp_mc_get_first(seq);
2420         else
2421                 im = igmp_mc_get_next(seq, v);
2422         ++*pos;
2423         return im;
2424 }
2425
2426 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2427         __releases(rcu)
2428 {
2429         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2430
2431         state->in_dev = NULL;
2432         state->dev = NULL;
2433         rcu_read_unlock();
2434 }
2435
2436 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2437 {
2438         if (v == SEQ_START_TOKEN)
2439                 seq_puts(seq,
2440                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2441         else {
2442                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2443                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2444                 char   *querier;
2445 #ifdef CONFIG_IP_MULTICAST
2446                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2447                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2448                           "V3";
2449 #else
2450                 querier = "NONE";
2451 #endif
2452
2453                 if (rcu_dereference(state->in_dev->mc_list) == im) {
2454                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2455                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2456                 }
2457
2458                 seq_printf(seq,
2459                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2460                            im->multiaddr, im->users,
2461                            im->tm_running, im->tm_running ?
2462                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2463                            im->reporter);
2464         }
2465         return 0;
2466 }
2467
2468 static const struct seq_operations igmp_mc_seq_ops = {
2469         .start  =       igmp_mc_seq_start,
2470         .next   =       igmp_mc_seq_next,
2471         .stop   =       igmp_mc_seq_stop,
2472         .show   =       igmp_mc_seq_show,
2473 };
2474
2475 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2476 {
2477         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2478                         sizeof(struct igmp_mc_iter_state));
2479 }
2480
2481 static const struct file_operations igmp_mc_seq_fops = {
2482         .owner          =       THIS_MODULE,
2483         .open           =       igmp_mc_seq_open,
2484         .read           =       seq_read,
2485         .llseek         =       seq_lseek,
2486         .release        =       seq_release_net,
2487 };
2488
2489 struct igmp_mcf_iter_state {
2490         struct seq_net_private p;
2491         struct net_device *dev;
2492         struct in_device *idev;
2493         struct ip_mc_list *im;
2494 };
2495
2496 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2497
2498 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2499 {
2500         struct net *net = seq_file_net(seq);
2501         struct ip_sf_list *psf = NULL;
2502         struct ip_mc_list *im = NULL;
2503         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2504
2505         state->idev = NULL;
2506         state->im = NULL;
2507         for_each_netdev_rcu(net, state->dev) {
2508                 struct in_device *idev;
2509                 idev = __in_dev_get_rcu(state->dev);
2510                 if (unlikely(idev == NULL))
2511                         continue;
2512                 im = rcu_dereference(idev->mc_list);
2513                 if (likely(im != NULL)) {
2514                         spin_lock_bh(&im->lock);
2515                         psf = im->sources;
2516                         if (likely(psf != NULL)) {
2517                                 state->im = im;
2518                                 state->idev = idev;
2519                                 break;
2520                         }
2521                         spin_unlock_bh(&im->lock);
2522                 }
2523         }
2524         return psf;
2525 }
2526
2527 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2528 {
2529         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2530
2531         psf = psf->sf_next;
2532         while (!psf) {
2533                 spin_unlock_bh(&state->im->lock);
2534                 state->im = state->im->next;
2535                 while (!state->im) {
2536                         state->dev = next_net_device_rcu(state->dev);
2537                         if (!state->dev) {
2538                                 state->idev = NULL;
2539                                 goto out;
2540                         }
2541                         state->idev = __in_dev_get_rcu(state->dev);
2542                         if (!state->idev)
2543                                 continue;
2544                         state->im = rcu_dereference(state->idev->mc_list);
2545                 }
2546                 if (!state->im)
2547                         break;
2548                 spin_lock_bh(&state->im->lock);
2549                 psf = state->im->sources;
2550         }
2551 out:
2552         return psf;
2553 }
2554
2555 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2556 {
2557         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2558         if (psf)
2559                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2560                         --pos;
2561         return pos ? NULL : psf;
2562 }
2563
2564 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2565         __acquires(rcu)
2566 {
2567         rcu_read_lock();
2568         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2569 }
2570
2571 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2572 {
2573         struct ip_sf_list *psf;
2574         if (v == SEQ_START_TOKEN)
2575                 psf = igmp_mcf_get_first(seq);
2576         else
2577                 psf = igmp_mcf_get_next(seq, v);
2578         ++*pos;
2579         return psf;
2580 }
2581
2582 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2583         __releases(rcu)
2584 {
2585         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2586         if (likely(state->im != NULL)) {
2587                 spin_unlock_bh(&state->im->lock);
2588                 state->im = NULL;
2589         }
2590         state->idev = NULL;
2591         state->dev = NULL;
2592         rcu_read_unlock();
2593 }
2594
2595 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2596 {
2597         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2598         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2599
2600         if (v == SEQ_START_TOKEN) {
2601                 seq_printf(seq,
2602                            "%3s %6s "
2603                            "%10s %10s %6s %6s\n", "Idx",
2604                            "Device", "MCA",
2605                            "SRC", "INC", "EXC");
2606         } else {
2607                 seq_printf(seq,
2608                            "%3d %6.6s 0x%08x "
2609                            "0x%08x %6lu %6lu\n",
2610                            state->dev->ifindex, state->dev->name,
2611                            ntohl(state->im->multiaddr),
2612                            ntohl(psf->sf_inaddr),
2613                            psf->sf_count[MCAST_INCLUDE],
2614                            psf->sf_count[MCAST_EXCLUDE]);
2615         }
2616         return 0;
2617 }
2618
2619 static const struct seq_operations igmp_mcf_seq_ops = {
2620         .start  =       igmp_mcf_seq_start,
2621         .next   =       igmp_mcf_seq_next,
2622         .stop   =       igmp_mcf_seq_stop,
2623         .show   =       igmp_mcf_seq_show,
2624 };
2625
2626 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2627 {
2628         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2629                         sizeof(struct igmp_mcf_iter_state));
2630 }
2631
2632 static const struct file_operations igmp_mcf_seq_fops = {
2633         .owner          =       THIS_MODULE,
2634         .open           =       igmp_mcf_seq_open,
2635         .read           =       seq_read,
2636         .llseek         =       seq_lseek,
2637         .release        =       seq_release_net,
2638 };
2639
2640 static int __net_init igmp_net_init(struct net *net)
2641 {
2642         struct proc_dir_entry *pde;
2643
2644         pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2645         if (!pde)
2646                 goto out_igmp;
2647         pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2648         if (!pde)
2649                 goto out_mcfilter;
2650         return 0;
2651
2652 out_mcfilter:
2653         proc_net_remove(net, "igmp");
2654 out_igmp:
2655         return -ENOMEM;
2656 }
2657
2658 static void __net_exit igmp_net_exit(struct net *net)
2659 {
2660         proc_net_remove(net, "mcfilter");
2661         proc_net_remove(net, "igmp");
2662 }
2663
2664 static struct pernet_operations igmp_net_ops = {
2665         .init = igmp_net_init,
2666         .exit = igmp_net_exit,
2667 };
2668
2669 int __init igmp_mc_proc_init(void)
2670 {
2671         return register_pernet_subsys(&igmp_net_ops);
2672 }
2673 #endif