net/ipv4/igmp.c

   1 /*
   2  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   3  *
   4  *      This code implements the IGMP protocol as defined in RFC1112. There has
   5  *      been a further revision of this protocol since which is now supported.
   6  *
   7  *      If you have trouble with this module be careful what gcc you have used,
   8  *      the older version didn't come out right using gcc 2.5.8, the newer one
   9  *      seems to fall out with gcc 2.6.2.
  10  *
  11  *      Authors:
  12  *              Alan Cox <alan@lxorguk.ukuu.org.uk>
  13  *
  14  *      This program is free software; you can redistribute it and/or
  15  *      modify it under the terms of the GNU General Public License
  16  *      as published by the Free Software Foundation; either version
  17  *      2 of the License, or (at your option) any later version.
  18  *
  19  *      Fixes:
  20  *
  21  *              Alan Cox        :       Added lots of __inline__ to optimise
  22  *                                      the memory usage of all the tiny little
  23  *                                      functions.
  24  *              Alan Cox        :       Dumped the header building experiment.
  25  *              Alan Cox        :       Minor tweaks ready for multicast routing
  26  *                                      and extended IGMP protocol.
  27  *              Alan Cox        :       Removed a load of inline directives. Gcc 2.5.8
  28  *                                      writes utterly bogus code otherwise (sigh)
  29  *                                      fixed IGMP loopback to behave in the manner
  30  *                                      desired by mrouted, fixed the fact it has been
  31  *                                      broken since 1.3.6 and cleaned up a few minor
  32  *                                      points.
  33  *
  34  *              Chih-Jen Chang  :       Tried to revise IGMP to Version 2
  35  *              Tsu-Sheng Tsao          E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  36  *                                      The enhancements are mainly based on Steve Deering's
  37  *                                      ipmulti-3.5 source code.
  38  *              Chih-Jen Chang  :       Added the igmp_get_mrouter_info and
  39  *              Tsu-Sheng Tsao          igmp_set_mrouter_info to keep track of
  40  *                                      the mrouted version on that device.
  41  *              Chih-Jen Chang  :       Added the max_resp_time parameter to
  42  *              Tsu-Sheng Tsao          igmp_heard_query(). Using this parameter
  43  *                                      to identify the multicast router version
  44  *                                      and do what the IGMP version 2 specified.
  45  *              Chih-Jen Chang  :       Added a timer to revert to IGMP V2 router
  46  *              Tsu-Sheng Tsao          if the specified time expired.
  47  *              Alan Cox        :       Stop IGMP from 0.0.0.0 being accepted.
  48  *              Alan Cox        :       Use GFP_ATOMIC in the right places.
  49  *              Christian Daudt :       igmp timer wasn't set for local group
  50  *                                      memberships but was being deleted,
  51  *                                      which caused a "del_timer() called
  52  *                                      from %p with timer not initialized\n"
  53  *                                      message (960131).
  54  *              Christian Daudt :       removed del_timer from
  55  *                                      igmp_timer_expire function (960205).
  56  *             Christian Daudt :       igmp_heard_report now only calls
  57  *                                     igmp_timer_expire if tm->running is
  58  *                                     true (960216).
  59  *              Malcolm Beattie :       ttl comparison wrong in igmp_rcv made
  60  *                                      igmp_heard_query never trigger. Expiry
  61  *                                      miscalculation fixed in igmp_heard_query
  62  *                                      and random() made to return unsigned to
  63  *                                      prevent negative expiry times.
  64  *              Alexey Kuznetsov:       Wrong group leaving behaviour, backport
  65  *                                      fix from pending 2.1.x patches.
  66  *              Alan Cox:               Forget to enable FDDI support earlier.
  67  *              Alexey Kuznetsov:       Fixed leaving groups on device down.
  68  *              Alexey Kuznetsov:       Accordance to igmp-v2-06 draft.
  69  *              David L Stevens:        IGMPv3 support, with help from
  70  *                                      Vinay Kulkarni
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/slab.h>
  75 #include <asm/uaccess.h>
  76 #include <asm/system.h>
  77 #include <linux/types.h>
  78 #include <linux/kernel.h>
  79 #include <linux/jiffies.h>
  80 #include <linux/string.h>
  81 #include <linux/socket.h>
  82 #include <linux/sockios.h>
  83 #include <linux/in.h>
  84 #include <linux/inet.h>
  85 #include <linux/netdevice.h>
  86 #include <linux/skbuff.h>
  87 #include <linux/inetdevice.h>
  88 #include <linux/igmp.h>
  89 #include <linux/if_arp.h>
  90 #include <linux/rtnetlink.h>
  91 #include <linux/times.h>
  92
  93 #include <net/net_namespace.h>
  94 #include <net/arp.h>
  95 #include <net/ip.h>
  96 #include <net/protocol.h>
  97 #include <net/route.h>
  98 #include <net/sock.h>
  99 #include <net/checksum.h>
 100 #include <linux/netfilter_ipv4.h>
 101 #ifdef CONFIG_IP_MROUTE
 102 #include <linux/mroute.h>
 103 #endif
 104 #ifdef CONFIG_PROC_FS
 105 #include <linux/proc_fs.h>
 106 #include <linux/seq_file.h>
 107 #endif
 108
 109 #define IP_MAX_MEMBERSHIPS      20
 110 #define IP_MAX_MSF              10
 111
 112 #ifdef CONFIG_IP_MULTICAST
 113 /* Parameter names and values are taken from igmp-v2-06 draft */
 114
 115 #define IGMP_V1_Router_Present_Timeout          (400*HZ)
 116 #define IGMP_V2_Router_Present_Timeout          (400*HZ)
 117 #define IGMP_Unsolicited_Report_Interval        (10*HZ)
 118 #define IGMP_Query_Response_Interval            (10*HZ)
 119 #define IGMP_Unsolicited_Report_Count           2
 120
 121
 122 #define IGMP_Initial_Report_Delay               (1)
 123
 124 /* IGMP_Initial_Report_Delay is not from IGMP specs!
 125  * IGMP specs require to report membership immediately after
 126  * joining a group, but we delay the first report by a
 127  * small interval. It seems more natural and still does not
 128  * contradict to specs provided this delay is small enough.
 129  */
 130
 131 #define IGMP_V1_SEEN(in_dev) \
 132         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 133          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 134          ((in_dev)->mr_v1_seen && \
 135           time_before(jiffies, (in_dev)->mr_v1_seen)))
 136 #define IGMP_V2_SEEN(in_dev) \
 137         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 138          IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 139          ((in_dev)->mr_v2_seen && \
 140           time_before(jiffies, (in_dev)->mr_v2_seen)))
 141
 142 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 143 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 144 static void igmpv3_clear_delrec(struct in_device *in_dev);
 145 static int sf_setstate(struct ip_mc_list *pmc);
 146 static void sf_markstate(struct ip_mc_list *pmc);
 147 #endif
 148 static void ip_mc_clear_src(struct ip_mc_list *pmc);
 149 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 150                          int sfcount, __be32 *psfsrc, int delta);
 151
 152 static void ip_ma_put(struct ip_mc_list *im)
 153 {
 154         if (atomic_dec_and_test(&im->refcnt)) {
 155                 in_dev_put(im->interface);
 156                 kfree(im);
 157         }
 158 }
 159
 160 #ifdef CONFIG_IP_MULTICAST
 161
 162 /*
 163  *      Timer management
 164  */
 165
 166 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
 167 {
 168         spin_lock_bh(&im->lock);
 169         if (del_timer(&im->timer))
 170                 atomic_dec(&im->refcnt);
 171         im->tm_running = 0;
 172         im->reporter = 0;
 173         im->unsolicit_count = 0;
 174         spin_unlock_bh(&im->lock);
 175 }
 176
 177 /* It must be called with locked im->lock */
 178 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 179 {
 180         int tv = net_random() % max_delay;
 181
 182         im->tm_running = 1;
 183         if (!mod_timer(&im->timer, jiffies+tv+2))
 184                 atomic_inc(&im->refcnt);
 185 }
 186
 187 static void igmp_gq_start_timer(struct in_device *in_dev)
 188 {
 189         int tv = net_random() % in_dev->mr_maxdelay;
 190
 191         in_dev->mr_gq_running = 1;
 192         if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 193                 in_dev_hold(in_dev);
 194 }
 195
 196 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 197 {
 198         int tv = net_random() % delay;
 199
 200         if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 201                 in_dev_hold(in_dev);
 202 }
 203
 204 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 205 {
 206         spin_lock_bh(&im->lock);
 207         im->unsolicit_count = 0;
 208         if (del_timer(&im->timer)) {
 209                 if ((long)(im->timer.expires-jiffies) < max_delay) {
 210                         add_timer(&im->timer);
 211                         im->tm_running = 1;
 212                         spin_unlock_bh(&im->lock);
 213                         return;
 214                 }
 215                 atomic_dec(&im->refcnt);
 216         }
 217         igmp_start_timer(im, max_delay);
 218         spin_unlock_bh(&im->lock);
 219 }
 220
 221
 222 /*
 223  *      Send an IGMP report.
 224  */
 225
 226 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 227
 228
 229 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 230         int gdeleted, int sdeleted)
 231 {
 232         switch (type) {
 233         case IGMPV3_MODE_IS_INCLUDE:
 234         case IGMPV3_MODE_IS_EXCLUDE:
 235                 if (gdeleted || sdeleted)
 236                         return 0;
 237                 if (!(pmc->gsquery && !psf->sf_gsresp)) {
 238                         if (pmc->sfmode == MCAST_INCLUDE)
 239                                 return 1;
 240                         /* don't include if this source is excluded
 241                          * in all filters
 242                          */
 243                         if (psf->sf_count[MCAST_INCLUDE])
 244                                 return type == IGMPV3_MODE_IS_INCLUDE;
 245                         return pmc->sfcount[MCAST_EXCLUDE] ==
 246                                 psf->sf_count[MCAST_EXCLUDE];
 247                 }
 248                 return 0;
 249         case IGMPV3_CHANGE_TO_INCLUDE:
 250                 if (gdeleted || sdeleted)
 251                         return 0;
 252                 return psf->sf_count[MCAST_INCLUDE] != 0;
 253         case IGMPV3_CHANGE_TO_EXCLUDE:
 254                 if (gdeleted || sdeleted)
 255                         return 0;
 256                 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 257                     psf->sf_count[MCAST_INCLUDE])
 258                         return 0;
 259                 return pmc->sfcount[MCAST_EXCLUDE] ==
 260                         psf->sf_count[MCAST_EXCLUDE];
 261         case IGMPV3_ALLOW_NEW_SOURCES:
 262                 if (gdeleted || !psf->sf_crcount)
 263                         return 0;
 264                 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 265         case IGMPV3_BLOCK_OLD_SOURCES:
 266                 if (pmc->sfmode == MCAST_INCLUDE)
 267                         return gdeleted || (psf->sf_crcount && sdeleted);
 268                 return psf->sf_crcount && !gdeleted && !sdeleted;
 269         }
 270         return 0;
 271 }
 272
 273 static int
 274 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 275 {
 276         struct ip_sf_list *psf;
 277         int scount = 0;
 278
 279         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 280                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 281                         continue;
 282                 scount++;
 283         }
 284         return scount;
 285 }
 286
 287 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 288 {
 289         struct sk_buff *skb;
 290         struct rtable *rt;
 291         struct iphdr *pip;
 292         struct igmpv3_report *pig;
 293         struct net *net = dev_net(dev);
 294
 295         skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 296         if (skb == NULL)
 297                 return NULL;
 298
 299         {
 300                 struct flowi fl = { .oif = dev->ifindex,
 301                                     .nl_u = { .ip4_u = {
 302                                     .daddr = IGMPV3_ALL_MCR } },
 303                                     .proto = IPPROTO_IGMP };
 304                 if (ip_route_output_key(net, &rt, &fl)) {
 305                         kfree_skb(skb);
 306                         return NULL;
 307                 }
 308         }
 309         if (rt->rt_src == 0) {
 310                 kfree_skb(skb);
 311                 ip_rt_put(rt);
 312                 return NULL;
 313         }
 314
 315         skb_dst_set(skb, &rt->dst);
 316         skb->dev = dev;
 317
 318         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 319
 320         skb_reset_network_header(skb);
 321         pip = ip_hdr(skb);
 322         skb_put(skb, sizeof(struct iphdr) + 4);
 323
 324         pip->version  = 4;
 325         pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 326         pip->tos      = 0xc0;
 327         pip->frag_off = htons(IP_DF);
 328         pip->ttl      = 1;
 329         pip->daddr    = rt->rt_dst;
 330         pip->saddr    = rt->rt_src;
 331         pip->protocol = IPPROTO_IGMP;
 332         pip->tot_len  = 0;      /* filled in later */
 333         ip_select_ident(pip, &rt->dst, NULL);
 334         ((u8*)&pip[1])[0] = IPOPT_RA;
 335         ((u8*)&pip[1])[1] = 4;
 336         ((u8*)&pip[1])[2] = 0;
 337         ((u8*)&pip[1])[3] = 0;
 338
 339         skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 340         skb_put(skb, sizeof(*pig));
 341         pig = igmpv3_report_hdr(skb);
 342         pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 343         pig->resv1 = 0;
 344         pig->csum = 0;
 345         pig->resv2 = 0;
 346         pig->ngrec = 0;
 347         return skb;
 348 }
 349
 350 static int igmpv3_sendpack(struct sk_buff *skb)
 351 {
 352         struct igmphdr *pig = igmp_hdr(skb);
 353         const int igmplen = skb->tail - skb->transport_header;
 354
 355         pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 356
 357         return ip_local_out(skb);
 358 }
 359
 360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 361 {
 362         return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
 363 }
 364
 365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 366         int type, struct igmpv3_grec **ppgr)
 367 {
 368         struct net_device *dev = pmc->interface->dev;
 369         struct igmpv3_report *pih;
 370         struct igmpv3_grec *pgr;
 371
 372         if (!skb)
 373                 skb = igmpv3_newpack(dev, dev->mtu);
 374         if (!skb)
 375                 return NULL;
 376         pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 377         pgr->grec_type = type;
 378         pgr->grec_auxwords = 0;
 379         pgr->grec_nsrcs = 0;
 380         pgr->grec_mca = pmc->multiaddr;
 381         pih = igmpv3_report_hdr(skb);
 382         pih->ngrec = htons(ntohs(pih->ngrec)+1);
 383         *ppgr = pgr;
 384         return skb;
 385 }
 386
 387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
 388         skb_tailroom(skb)) : 0)
 389
 390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 391         int type, int gdeleted, int sdeleted)
 392 {
 393         struct net_device *dev = pmc->interface->dev;
 394         struct igmpv3_report *pih;
 395         struct igmpv3_grec *pgr = NULL;
 396         struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 397         int scount, stotal, first, isquery, truncate;
 398
 399         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 400                 return skb;
 401
 402         isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 403                   type == IGMPV3_MODE_IS_EXCLUDE;
 404         truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 405                     type == IGMPV3_CHANGE_TO_EXCLUDE;
 406
 407         stotal = scount = 0;
 408
 409         psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 410
 411         if (!*psf_list)
 412                 goto empty_source;
 413
 414         pih = skb ? igmpv3_report_hdr(skb) : NULL;
 415
 416         /* EX and TO_EX get a fresh packet, if needed */
 417         if (truncate) {
 418                 if (pih && pih->ngrec &&
 419                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 420                         if (skb)
 421                                 igmpv3_sendpack(skb);
 422                         skb = igmpv3_newpack(dev, dev->mtu);
 423                 }
 424         }
 425         first = 1;
 426         psf_prev = NULL;
 427         for (psf=*psf_list; psf; psf=psf_next) {
 428                 __be32 *psrc;
 429
 430                 psf_next = psf->sf_next;
 431
 432                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 433                         psf_prev = psf;
 434                         continue;
 435                 }
 436
 437                 /* clear marks on query responses */
 438                 if (isquery)
 439                         psf->sf_gsresp = 0;
 440
 441                 if (AVAILABLE(skb) < sizeof(__be32) +
 442                     first*sizeof(struct igmpv3_grec)) {
 443                         if (truncate && !first)
 444                                 break;   /* truncate these */
 445                         if (pgr)
 446                                 pgr->grec_nsrcs = htons(scount);
 447                         if (skb)
 448                                 igmpv3_sendpack(skb);
 449                         skb = igmpv3_newpack(dev, dev->mtu);
 450                         first = 1;
 451                         scount = 0;
 452                 }
 453                 if (first) {
 454                         skb = add_grhead(skb, pmc, type, &pgr);
 455                         first = 0;
 456                 }
 457                 if (!skb)
 458                         return NULL;
 459                 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 460                 *psrc = psf->sf_inaddr;
 461                 scount++; stotal++;
 462                 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 463                      type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 464                         psf->sf_crcount--;
 465                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 466                                 if (psf_prev)
 467                                         psf_prev->sf_next = psf->sf_next;
 468                                 else
 469                                         *psf_list = psf->sf_next;
 470                                 kfree(psf);
 471                                 continue;
 472                         }
 473                 }
 474                 psf_prev = psf;
 475         }
 476
 477 empty_source:
 478         if (!stotal) {
 479                 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 480                     type == IGMPV3_BLOCK_OLD_SOURCES)
 481                         return skb;
 482                 if (pmc->crcount || isquery) {
 483                         /* make sure we have room for group header */
 484                         if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 485                                 igmpv3_sendpack(skb);
 486                                 skb = NULL; /* add_grhead will get a new one */
 487                         }
 488                         skb = add_grhead(skb, pmc, type, &pgr);
 489                 }
 490         }
 491         if (pgr)
 492                 pgr->grec_nsrcs = htons(scount);
 493
 494         if (isquery)
 495                 pmc->gsquery = 0;       /* clear query state on report */
 496         return skb;
 497 }
 498
 499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 500 {
 501         struct sk_buff *skb = NULL;
 502         int type;
 503
 504         if (!pmc) {
 505                 read_lock(&in_dev->mc_list_lock);
 506                 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 507                         if (pmc->multiaddr == IGMP_ALL_HOSTS)
 508                                 continue;
 509                         spin_lock_bh(&pmc->lock);
 510                         if (pmc->sfcount[MCAST_EXCLUDE])
 511                                 type = IGMPV3_MODE_IS_EXCLUDE;
 512                         else
 513                                 type = IGMPV3_MODE_IS_INCLUDE;
 514                         skb = add_grec(skb, pmc, type, 0, 0);
 515                         spin_unlock_bh(&pmc->lock);
 516                 }
 517                 read_unlock(&in_dev->mc_list_lock);
 518         } else {
 519                 spin_lock_bh(&pmc->lock);
 520                 if (pmc->sfcount[MCAST_EXCLUDE])
 521                         type = IGMPV3_MODE_IS_EXCLUDE;
 522                 else
 523                         type = IGMPV3_MODE_IS_INCLUDE;
 524                 skb = add_grec(skb, pmc, type, 0, 0);
 525                 spin_unlock_bh(&pmc->lock);
 526         }
 527         if (!skb)
 528                 return 0;
 529         return igmpv3_sendpack(skb);
 530 }
 531
 532 /*
 533  * remove zero-count source records from a source filter list
 534  */
 535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 536 {
 537         struct ip_sf_list *psf_prev, *psf_next, *psf;
 538
 539         psf_prev = NULL;
 540         for (psf=*ppsf; psf; psf = psf_next) {
 541                 psf_next = psf->sf_next;
 542                 if (psf->sf_crcount == 0) {
 543                         if (psf_prev)
 544                                 psf_prev->sf_next = psf->sf_next;
 545                         else
 546                                 *ppsf = psf->sf_next;
 547                         kfree(psf);
 548                 } else
 549                         psf_prev = psf;
 550         }
 551 }
 552
 553 static void igmpv3_send_cr(struct in_device *in_dev)
 554 {
 555         struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 556         struct sk_buff *skb = NULL;
 557         int type, dtype;
 558
 559         read_lock(&in_dev->mc_list_lock);
 560         spin_lock_bh(&in_dev->mc_tomb_lock);
 561
 562         /* deleted MCA's */
 563         pmc_prev = NULL;
 564         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 565                 pmc_next = pmc->next;
 566                 if (pmc->sfmode == MCAST_INCLUDE) {
 567                         type = IGMPV3_BLOCK_OLD_SOURCES;
 568                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 569                         skb = add_grec(skb, pmc, type, 1, 0);
 570                         skb = add_grec(skb, pmc, dtype, 1, 1);
 571                 }
 572                 if (pmc->crcount) {
 573                         if (pmc->sfmode == MCAST_EXCLUDE) {
 574                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 575                                 skb = add_grec(skb, pmc, type, 1, 0);
 576                         }
 577                         pmc->crcount--;
 578                         if (pmc->crcount == 0) {
 579                                 igmpv3_clear_zeros(&pmc->tomb);
 580                                 igmpv3_clear_zeros(&pmc->sources);
 581                         }
 582                 }
 583                 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 584                         if (pmc_prev)
 585                                 pmc_prev->next = pmc_next;
 586                         else
 587                                 in_dev->mc_tomb = pmc_next;
 588                         in_dev_put(pmc->interface);
 589                         kfree(pmc);
 590                 } else
 591                         pmc_prev = pmc;
 592         }
 593         spin_unlock_bh(&in_dev->mc_tomb_lock);
 594
 595         /* change recs */
 596         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
 597                 spin_lock_bh(&pmc->lock);
 598                 if (pmc->sfcount[MCAST_EXCLUDE]) {
 599                         type = IGMPV3_BLOCK_OLD_SOURCES;
 600                         dtype = IGMPV3_ALLOW_NEW_SOURCES;
 601                 } else {
 602                         type = IGMPV3_ALLOW_NEW_SOURCES;
 603                         dtype = IGMPV3_BLOCK_OLD_SOURCES;
 604                 }
 605                 skb = add_grec(skb, pmc, type, 0, 0);
 606                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
 607
 608                 /* filter mode changes */
 609                 if (pmc->crcount) {
 610                         if (pmc->sfmode == MCAST_EXCLUDE)
 611                                 type = IGMPV3_CHANGE_TO_EXCLUDE;
 612                         else
 613                                 type = IGMPV3_CHANGE_TO_INCLUDE;
 614                         skb = add_grec(skb, pmc, type, 0, 0);
 615                         pmc->crcount--;
 616                 }
 617                 spin_unlock_bh(&pmc->lock);
 618         }
 619         read_unlock(&in_dev->mc_list_lock);
 620
 621         if (!skb)
 622                 return;
 623         (void) igmpv3_sendpack(skb);
 624 }
 625
 626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 627         int type)
 628 {
 629         struct sk_buff *skb;
 630         struct iphdr *iph;
 631         struct igmphdr *ih;
 632         struct rtable *rt;
 633         struct net_device *dev = in_dev->dev;
 634         struct net *net = dev_net(dev);
 635         __be32  group = pmc ? pmc->multiaddr : 0;
 636         __be32  dst;
 637
 638         if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 639                 return igmpv3_send_report(in_dev, pmc);
 640         else if (type == IGMP_HOST_LEAVE_MESSAGE)
 641                 dst = IGMP_ALL_ROUTER;
 642         else
 643                 dst = group;
 644
 645         {
 646                 struct flowi fl = { .oif = dev->ifindex,
 647                                     .nl_u = { .ip4_u = { .daddr = dst } },
 648                                     .proto = IPPROTO_IGMP };
 649                 if (ip_route_output_key(net, &rt, &fl))
 650                         return -1;
 651         }
 652         if (rt->rt_src == 0) {
 653                 ip_rt_put(rt);
 654                 return -1;
 655         }
 656
 657         skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
 658         if (skb == NULL) {
 659                 ip_rt_put(rt);
 660                 return -1;
 661         }
 662
 663         skb_dst_set(skb, &rt->dst);
 664
 665         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 666
 667         skb_reset_network_header(skb);
 668         iph = ip_hdr(skb);
 669         skb_put(skb, sizeof(struct iphdr) + 4);
 670
 671         iph->version  = 4;
 672         iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 673         iph->tos      = 0xc0;
 674         iph->frag_off = htons(IP_DF);
 675         iph->ttl      = 1;
 676         iph->daddr    = dst;
 677         iph->saddr    = rt->rt_src;
 678         iph->protocol = IPPROTO_IGMP;
 679         ip_select_ident(iph, &rt->dst, NULL);
 680         ((u8*)&iph[1])[0] = IPOPT_RA;
 681         ((u8*)&iph[1])[1] = 4;
 682         ((u8*)&iph[1])[2] = 0;
 683         ((u8*)&iph[1])[3] = 0;
 684
 685         ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 686         ih->type = type;
 687         ih->code = 0;
 688         ih->csum = 0;
 689         ih->group = group;
 690         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 691
 692         return ip_local_out(skb);
 693 }
 694
 695 static void igmp_gq_timer_expire(unsigned long data)
 696 {
 697         struct in_device *in_dev = (struct in_device *)data;
 698
 699         in_dev->mr_gq_running = 0;
 700         igmpv3_send_report(in_dev, NULL);
 701         __in_dev_put(in_dev);
 702 }
 703
 704 static void igmp_ifc_timer_expire(unsigned long data)
 705 {
 706         struct in_device *in_dev = (struct in_device *)data;
 707
 708         igmpv3_send_cr(in_dev);
 709         if (in_dev->mr_ifc_count) {
 710                 in_dev->mr_ifc_count--;
 711                 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 712         }
 713         __in_dev_put(in_dev);
 714 }
 715
 716 static void igmp_ifc_event(struct in_device *in_dev)
 717 {
 718         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 719                 return;
 720         in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 721                 IGMP_Unsolicited_Report_Count;
 722         igmp_ifc_start_timer(in_dev, 1);
 723 }
 724
 725
 726 static void igmp_timer_expire(unsigned long data)
 727 {
 728         struct ip_mc_list *im=(struct ip_mc_list *)data;
 729         struct in_device *in_dev = im->interface;
 730
 731         spin_lock(&im->lock);
 732         im->tm_running = 0;
 733
 734         if (im->unsolicit_count) {
 735                 im->unsolicit_count--;
 736                 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 737         }
 738         im->reporter = 1;
 739         spin_unlock(&im->lock);
 740
 741         if (IGMP_V1_SEEN(in_dev))
 742                 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 743         else if (IGMP_V2_SEEN(in_dev))
 744                 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 745         else
 746                 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 747
 748         ip_ma_put(im);
 749 }
 750
 751 /* mark EXCLUDE-mode sources */
 752 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 753 {
 754         struct ip_sf_list *psf;
 755         int i, scount;
 756
 757         scount = 0;
 758         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 759                 if (scount == nsrcs)
 760                         break;
 761                 for (i=0; i<nsrcs; i++) {
 762                         /* skip inactive filters */
 763                         if (pmc->sfcount[MCAST_INCLUDE] ||
 764                             pmc->sfcount[MCAST_EXCLUDE] !=
 765                             psf->sf_count[MCAST_EXCLUDE])
 766                                 continue;
 767                         if (srcs[i] == psf->sf_inaddr) {
 768                                 scount++;
 769                                 break;
 770                         }
 771                 }
 772         }
 773         pmc->gsquery = 0;
 774         if (scount == nsrcs)    /* all sources excluded */
 775                 return 0;
 776         return 1;
 777 }
 778
 779 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 780 {
 781         struct ip_sf_list *psf;
 782         int i, scount;
 783
 784         if (pmc->sfmode == MCAST_EXCLUDE)
 785                 return igmp_xmarksources(pmc, nsrcs, srcs);
 786
 787         /* mark INCLUDE-mode sources */
 788         scount = 0;
 789         for (psf=pmc->sources; psf; psf=psf->sf_next) {
 790                 if (scount == nsrcs)
 791                         break;
 792                 for (i=0; i<nsrcs; i++)
 793                         if (srcs[i] == psf->sf_inaddr) {
 794                                 psf->sf_gsresp = 1;
 795                                 scount++;
 796                                 break;
 797                         }
 798         }
 799         if (!scount) {
 800                 pmc->gsquery = 0;
 801                 return 0;
 802         }
 803         pmc->gsquery = 1;
 804         return 1;
 805 }
 806
 807 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 808 {
 809         struct ip_mc_list *im;
 810
 811         /* Timers are only set for non-local groups */
 812
 813         if (group == IGMP_ALL_HOSTS)
 814                 return;
 815
 816         read_lock(&in_dev->mc_list_lock);
 817         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 818                 if (im->multiaddr == group) {
 819                         igmp_stop_timer(im);
 820                         break;
 821                 }
 822         }
 823         read_unlock(&in_dev->mc_list_lock);
 824 }
 825
 826 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 827         int len)
 828 {
 829         struct igmphdr          *ih = igmp_hdr(skb);
 830         struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 831         struct ip_mc_list       *im;
 832         __be32                  group = ih->group;
 833         int                     max_delay;
 834         int                     mark = 0;
 835
 836
 837         if (len == 8) {
 838                 if (ih->code == 0) {
 839                         /* Alas, old v1 router presents here. */
 840
 841                         max_delay = IGMP_Query_Response_Interval;
 842                         in_dev->mr_v1_seen = jiffies +
 843                                 IGMP_V1_Router_Present_Timeout;
 844                         group = 0;
 845                 } else {
 846                         /* v2 router present */
 847                         max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 848                         in_dev->mr_v2_seen = jiffies +
 849                                 IGMP_V2_Router_Present_Timeout;
 850                 }
 851                 /* cancel the interface change timer */
 852                 in_dev->mr_ifc_count = 0;
 853                 if (del_timer(&in_dev->mr_ifc_timer))
 854                         __in_dev_put(in_dev);
 855                 /* clear deleted report items */
 856                 igmpv3_clear_delrec(in_dev);
 857         } else if (len < 12) {
 858                 return; /* ignore bogus packet; freed by caller */
 859         } else { /* v3 */
 860                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 861                         return;
 862
 863                 ih3 = igmpv3_query_hdr(skb);
 864                 if (ih3->nsrcs) {
 865                         if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 866                                            + ntohs(ih3->nsrcs)*sizeof(__be32)))
 867                                 return;
 868                         ih3 = igmpv3_query_hdr(skb);
 869                 }
 870
 871                 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 872                 if (!max_delay)
 873                         max_delay = 1;  /* can't mod w/ 0 */
 874                 in_dev->mr_maxdelay = max_delay;
 875                 if (ih3->qrv)
 876                         in_dev->mr_qrv = ih3->qrv;
 877                 if (!group) { /* general query */
 878                         if (ih3->nsrcs)
 879                                 return; /* no sources allowed */
 880                         igmp_gq_start_timer(in_dev);
 881                         return;
 882                 }
 883                 /* mark sources to include, if group & source-specific */
 884                 mark = ih3->nsrcs != 0;
 885         }
 886
 887         /*
 888          * - Start the timers in all of our membership records
 889          *   that the query applies to for the interface on
 890          *   which the query arrived excl. those that belong
 891          *   to a "local" group (224.0.0.X)
 892          * - For timers already running check if they need to
 893          *   be reset.
 894          * - Use the igmp->igmp_code field as the maximum
 895          *   delay possible
 896          */
 897         read_lock(&in_dev->mc_list_lock);
 898         for (im=in_dev->mc_list; im!=NULL; im=im->next) {
 899                 int changed;
 900
 901                 if (group && group != im->multiaddr)
 902                         continue;
 903                 if (im->multiaddr == IGMP_ALL_HOSTS)
 904                         continue;
 905                 spin_lock_bh(&im->lock);
 906                 if (im->tm_running)
 907                         im->gsquery = im->gsquery && mark;
 908                 else
 909                         im->gsquery = mark;
 910                 changed = !im->gsquery ||
 911                         igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 912                 spin_unlock_bh(&im->lock);
 913                 if (changed)
 914                         igmp_mod_timer(im, max_delay);
 915         }
 916         read_unlock(&in_dev->mc_list_lock);
 917 }
 918
 919 /* called in rcu_read_lock() section */
 920 int igmp_rcv(struct sk_buff *skb)
 921 {
 922         /* This basically follows the spec line by line -- see RFC1112 */
 923         struct igmphdr *ih;
 924         struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
 925         int len = skb->len;
 926
 927         if (in_dev == NULL)
 928                 goto drop;
 929
 930         if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 931                 goto drop;
 932
 933         switch (skb->ip_summed) {
 934         case CHECKSUM_COMPLETE:
 935                 if (!csum_fold(skb->csum))
 936                         break;
 937                 /* fall through */
 938         case CHECKSUM_NONE:
 939                 skb->csum = 0;
 940                 if (__skb_checksum_complete(skb))
 941                         goto drop;
 942         }
 943
 944         ih = igmp_hdr(skb);
 945         switch (ih->type) {
 946         case IGMP_HOST_MEMBERSHIP_QUERY:
 947                 igmp_heard_query(in_dev, skb, len);
 948                 break;
 949         case IGMP_HOST_MEMBERSHIP_REPORT:
 950         case IGMPV2_HOST_MEMBERSHIP_REPORT:
 951                 /* Is it our report looped back? */
 952                 if (skb_rtable(skb)->fl.iif == 0)
 953                         break;
 954                 /* don't rely on MC router hearing unicast reports */
 955                 if (skb->pkt_type == PACKET_MULTICAST ||
 956                     skb->pkt_type == PACKET_BROADCAST)
 957                         igmp_heard_report(in_dev, ih->group);
 958                 break;
 959         case IGMP_PIM:
 960 #ifdef CONFIG_IP_PIMSM_V1
 961                 return pim_rcv_v1(skb);
 962 #endif
 963         case IGMPV3_HOST_MEMBERSHIP_REPORT:
 964         case IGMP_DVMRP:
 965         case IGMP_TRACE:
 966         case IGMP_HOST_LEAVE_MESSAGE:
 967         case IGMP_MTRACE:
 968         case IGMP_MTRACE_RESP:
 969                 break;
 970         default:
 971                 break;
 972         }
 973
 974 drop:
 975         kfree_skb(skb);
 976         return 0;
 977 }
 978
 979 #endif
 980
 981
 982 /*
 983  *      Add a filter to a device
 984  */
 985
 986 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
 987 {
 988         char buf[MAX_ADDR_LEN];
 989         struct net_device *dev = in_dev->dev;
 990
 991         /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
 992            We will get multicast token leakage, when IFF_MULTICAST
 993            is changed. This check should be done in dev->set_multicast_list
 994            routine. Something sort of:
 995            if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
 996            --ANK
 997            */
 998         if (arp_mc_map(addr, buf, dev, 0) == 0)
 999                 dev_mc_add(dev, buf);
1000 }
1001
1002 /*
1003  *      Remove a filter from a device
1004  */
1005
1006 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1007 {
1008         char buf[MAX_ADDR_LEN];
1009         struct net_device *dev = in_dev->dev;
1010
1011         if (arp_mc_map(addr, buf, dev, 0) == 0)
1012                 dev_mc_del(dev, buf);
1013 }
1014
1015 #ifdef CONFIG_IP_MULTICAST
1016 /*
1017  * deleted ip_mc_list manipulation
1018  */
1019 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1020 {
1021         struct ip_mc_list *pmc;
1022
1023         /* this is an "ip_mc_list" for convenience; only the fields below
1024          * are actually used. In particular, the refcnt and users are not
1025          * used for management of the delete list. Using the same structure
1026          * for deleted items allows change reports to use common code with
1027          * non-deleted or query-response MCA's.
1028          */
1029         pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1030         if (!pmc)
1031                 return;
1032         spin_lock_bh(&im->lock);
1033         pmc->interface = im->interface;
1034         in_dev_hold(in_dev);
1035         pmc->multiaddr = im->multiaddr;
1036         pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1037                 IGMP_Unsolicited_Report_Count;
1038         pmc->sfmode = im->sfmode;
1039         if (pmc->sfmode == MCAST_INCLUDE) {
1040                 struct ip_sf_list *psf;
1041
1042                 pmc->tomb = im->tomb;
1043                 pmc->sources = im->sources;
1044                 im->tomb = im->sources = NULL;
1045                 for (psf=pmc->sources; psf; psf=psf->sf_next)
1046                         psf->sf_crcount = pmc->crcount;
1047         }
1048         spin_unlock_bh(&im->lock);
1049
1050         spin_lock_bh(&in_dev->mc_tomb_lock);
1051         pmc->next = in_dev->mc_tomb;
1052         in_dev->mc_tomb = pmc;
1053         spin_unlock_bh(&in_dev->mc_tomb_lock);
1054 }
1055
1056 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1057 {
1058         struct ip_mc_list *pmc, *pmc_prev;
1059         struct ip_sf_list *psf, *psf_next;
1060
1061         spin_lock_bh(&in_dev->mc_tomb_lock);
1062         pmc_prev = NULL;
1063         for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1064                 if (pmc->multiaddr == multiaddr)
1065                         break;
1066                 pmc_prev = pmc;
1067         }
1068         if (pmc) {
1069                 if (pmc_prev)
1070                         pmc_prev->next = pmc->next;
1071                 else
1072                         in_dev->mc_tomb = pmc->next;
1073         }
1074         spin_unlock_bh(&in_dev->mc_tomb_lock);
1075         if (pmc) {
1076                 for (psf=pmc->tomb; psf; psf=psf_next) {
1077                         psf_next = psf->sf_next;
1078                         kfree(psf);
1079                 }
1080                 in_dev_put(pmc->interface);
1081                 kfree(pmc);
1082         }
1083 }
1084
1085 static void igmpv3_clear_delrec(struct in_device *in_dev)
1086 {
1087         struct ip_mc_list *pmc, *nextpmc;
1088
1089         spin_lock_bh(&in_dev->mc_tomb_lock);
1090         pmc = in_dev->mc_tomb;
1091         in_dev->mc_tomb = NULL;
1092         spin_unlock_bh(&in_dev->mc_tomb_lock);
1093
1094         for (; pmc; pmc = nextpmc) {
1095                 nextpmc = pmc->next;
1096                 ip_mc_clear_src(pmc);
1097                 in_dev_put(pmc->interface);
1098                 kfree(pmc);
1099         }
1100         /* clear dead sources, too */
1101         read_lock(&in_dev->mc_list_lock);
1102         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1103                 struct ip_sf_list *psf, *psf_next;
1104
1105                 spin_lock_bh(&pmc->lock);
1106                 psf = pmc->tomb;
1107                 pmc->tomb = NULL;
1108                 spin_unlock_bh(&pmc->lock);
1109                 for (; psf; psf=psf_next) {
1110                         psf_next = psf->sf_next;
1111                         kfree(psf);
1112                 }
1113         }
1114         read_unlock(&in_dev->mc_list_lock);
1115 }
1116 #endif
1117
1118 static void igmp_group_dropped(struct ip_mc_list *im)
1119 {
1120         struct in_device *in_dev = im->interface;
1121 #ifdef CONFIG_IP_MULTICAST
1122         int reporter;
1123 #endif
1124
1125         if (im->loaded) {
1126                 im->loaded = 0;
1127                 ip_mc_filter_del(in_dev, im->multiaddr);
1128         }
1129
1130 #ifdef CONFIG_IP_MULTICAST
1131         if (im->multiaddr == IGMP_ALL_HOSTS)
1132                 return;
1133
1134         reporter = im->reporter;
1135         igmp_stop_timer(im);
1136
1137         if (!in_dev->dead) {
1138                 if (IGMP_V1_SEEN(in_dev))
1139                         goto done;
1140                 if (IGMP_V2_SEEN(in_dev)) {
1141                         if (reporter)
1142                                 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1143                         goto done;
1144                 }
1145                 /* IGMPv3 */
1146                 igmpv3_add_delrec(in_dev, im);
1147
1148                 igmp_ifc_event(in_dev);
1149         }
1150 done:
1151 #endif
1152         ip_mc_clear_src(im);
1153 }
1154
1155 static void igmp_group_added(struct ip_mc_list *im)
1156 {
1157         struct in_device *in_dev = im->interface;
1158
1159         if (im->loaded == 0) {
1160                 im->loaded = 1;
1161                 ip_mc_filter_add(in_dev, im->multiaddr);
1162         }
1163
1164 #ifdef CONFIG_IP_MULTICAST
1165         if (im->multiaddr == IGMP_ALL_HOSTS)
1166                 return;
1167
1168         if (in_dev->dead)
1169                 return;
1170         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1171                 spin_lock_bh(&im->lock);
1172                 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1173                 spin_unlock_bh(&im->lock);
1174                 return;
1175         }
1176         /* else, v3 */
1177
1178         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1179                 IGMP_Unsolicited_Report_Count;
1180         igmp_ifc_event(in_dev);
1181 #endif
1182 }
1183
1184
1185 /*
1186  *      Multicast list managers
1187  */
1188
1189
1190 /*
1191  *      A socket has joined a multicast group on device dev.
1192  */
1193
1194 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1195 {
1196         struct ip_mc_list *im;
1197
1198         ASSERT_RTNL();
1199
1200         for (im=in_dev->mc_list; im; im=im->next) {
1201                 if (im->multiaddr == addr) {
1202                         im->users++;
1203                         ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1204                         goto out;
1205                 }
1206         }
1207
1208         im = kmalloc(sizeof(*im), GFP_KERNEL);
1209         if (!im)
1210                 goto out;
1211
1212         im->users = 1;
1213         im->interface = in_dev;
1214         in_dev_hold(in_dev);
1215         im->multiaddr = addr;
1216         /* initial mode is (EX, empty) */
1217         im->sfmode = MCAST_EXCLUDE;
1218         im->sfcount[MCAST_INCLUDE] = 0;
1219         im->sfcount[MCAST_EXCLUDE] = 1;
1220         im->sources = NULL;
1221         im->tomb = NULL;
1222         im->crcount = 0;
1223         atomic_set(&im->refcnt, 1);
1224         spin_lock_init(&im->lock);
1225 #ifdef CONFIG_IP_MULTICAST
1226         im->tm_running = 0;
1227         setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1228         im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1229         im->reporter = 0;
1230         im->gsquery = 0;
1231 #endif
1232         im->loaded = 0;
1233         write_lock_bh(&in_dev->mc_list_lock);
1234         im->next = in_dev->mc_list;
1235         in_dev->mc_list = im;
1236         in_dev->mc_count++;
1237         write_unlock_bh(&in_dev->mc_list_lock);
1238 #ifdef CONFIG_IP_MULTICAST
1239         igmpv3_del_delrec(in_dev, im->multiaddr);
1240 #endif
1241         igmp_group_added(im);
1242         if (!in_dev->dead)
1243                 ip_rt_multicast_event(in_dev);
1244 out:
1245         return;
1246 }
1247
1248 /*
1249  *      Resend IGMP JOIN report; used for bonding.
1250  */
1251 void ip_mc_rejoin_group(struct ip_mc_list *im)
1252 {
1253 #ifdef CONFIG_IP_MULTICAST
1254         struct in_device *in_dev = im->interface;
1255
1256         if (im->multiaddr == IGMP_ALL_HOSTS)
1257                 return;
1258
1259         if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1260                 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1261                 return;
1262         }
1263         /* else, v3 */
1264         im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1265                 IGMP_Unsolicited_Report_Count;
1266         igmp_ifc_event(in_dev);
1267 #endif
1268 }
1269
1270 /*
1271  *      A socket has left a multicast group on device dev
1272  */
1273
1274 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1275 {
1276         struct ip_mc_list *i, **ip;
1277
1278         ASSERT_RTNL();
1279
1280         for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1281                 if (i->multiaddr == addr) {
1282                         if (--i->users == 0) {
1283                                 write_lock_bh(&in_dev->mc_list_lock);
1284                                 *ip = i->next;
1285                                 in_dev->mc_count--;
1286                                 write_unlock_bh(&in_dev->mc_list_lock);
1287                                 igmp_group_dropped(i);
1288
1289                                 if (!in_dev->dead)
1290                                         ip_rt_multicast_event(in_dev);
1291
1292                                 ip_ma_put(i);
1293                                 return;
1294                         }
1295                         break;
1296                 }
1297         }
1298 }
1299
1300 /* Device changing type */
1301
1302 void ip_mc_unmap(struct in_device *in_dev)
1303 {
1304         struct ip_mc_list *i;
1305
1306         ASSERT_RTNL();
1307
1308         for (i = in_dev->mc_list; i; i = i->next)
1309                 igmp_group_dropped(i);
1310 }
1311
1312 void ip_mc_remap(struct in_device *in_dev)
1313 {
1314         struct ip_mc_list *i;
1315
1316         ASSERT_RTNL();
1317
1318         for (i = in_dev->mc_list; i; i = i->next)
1319                 igmp_group_added(i);
1320 }
1321
1322 /* Device going down */
1323
1324 void ip_mc_down(struct in_device *in_dev)
1325 {
1326         struct ip_mc_list *i;
1327
1328         ASSERT_RTNL();
1329
1330         for (i=in_dev->mc_list; i; i=i->next)
1331                 igmp_group_dropped(i);
1332
1333 #ifdef CONFIG_IP_MULTICAST
1334         in_dev->mr_ifc_count = 0;
1335         if (del_timer(&in_dev->mr_ifc_timer))
1336                 __in_dev_put(in_dev);
1337         in_dev->mr_gq_running = 0;
1338         if (del_timer(&in_dev->mr_gq_timer))
1339                 __in_dev_put(in_dev);
1340         igmpv3_clear_delrec(in_dev);
1341 #endif
1342
1343         ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1344 }
1345
1346 void ip_mc_init_dev(struct in_device *in_dev)
1347 {
1348         ASSERT_RTNL();
1349
1350         in_dev->mc_tomb = NULL;
1351 #ifdef CONFIG_IP_MULTICAST
1352         in_dev->mr_gq_running = 0;
1353         setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1354                         (unsigned long)in_dev);
1355         in_dev->mr_ifc_count = 0;
1356         in_dev->mc_count     = 0;
1357         setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1358                         (unsigned long)in_dev);
1359         in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1360 #endif
1361
1362         rwlock_init(&in_dev->mc_list_lock);
1363         spin_lock_init(&in_dev->mc_tomb_lock);
1364 }
1365
1366 /* Device going up */
1367
1368 void ip_mc_up(struct in_device *in_dev)
1369 {
1370         struct ip_mc_list *i;
1371
1372         ASSERT_RTNL();
1373
1374         ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1375
1376         for (i=in_dev->mc_list; i; i=i->next)
1377                 igmp_group_added(i);
1378 }
1379
1380 /*
1381  *      Device is about to be destroyed: clean up.
1382  */
1383
1384 void ip_mc_destroy_dev(struct in_device *in_dev)
1385 {
1386         struct ip_mc_list *i;
1387
1388         ASSERT_RTNL();
1389
1390         /* Deactivate timers */
1391         ip_mc_down(in_dev);
1392
1393         write_lock_bh(&in_dev->mc_list_lock);
1394         while ((i = in_dev->mc_list) != NULL) {
1395                 in_dev->mc_list = i->next;
1396                 in_dev->mc_count--;
1397                 write_unlock_bh(&in_dev->mc_list_lock);
1398                 igmp_group_dropped(i);
1399                 ip_ma_put(i);
1400
1401                 write_lock_bh(&in_dev->mc_list_lock);
1402         }
1403         write_unlock_bh(&in_dev->mc_list_lock);
1404 }
1405
1406 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1407 {
1408         struct flowi fl = { .nl_u = { .ip4_u =
1409                                       { .daddr = imr->imr_multiaddr.s_addr } } };
1410         struct rtable *rt;
1411         struct net_device *dev = NULL;
1412         struct in_device *idev = NULL;
1413
1414         if (imr->imr_ifindex) {
1415                 idev = inetdev_by_index(net, imr->imr_ifindex);
1416                 if (idev)
1417                         __in_dev_put(idev);
1418                 return idev;
1419         }
1420         if (imr->imr_address.s_addr) {
1421                 dev = ip_dev_find(net, imr->imr_address.s_addr);
1422                 if (!dev)
1423                         return NULL;
1424                 dev_put(dev);
1425         }
1426
1427         if (!dev && !ip_route_output_key(net, &rt, &fl)) {
1428                 dev = rt->dst.dev;
1429                 ip_rt_put(rt);
1430         }
1431         if (dev) {
1432                 imr->imr_ifindex = dev->ifindex;
1433                 idev = __in_dev_get_rtnl(dev);
1434         }
1435         return idev;
1436 }
1437
1438 /*
1439  *      Join a socket to a group
1440  */
1441 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1442 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1443
1444
1445 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1446         __be32 *psfsrc)
1447 {
1448         struct ip_sf_list *psf, *psf_prev;
1449         int rv = 0;
1450
1451         psf_prev = NULL;
1452         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1453                 if (psf->sf_inaddr == *psfsrc)
1454                         break;
1455                 psf_prev = psf;
1456         }
1457         if (!psf || psf->sf_count[sfmode] == 0) {
1458                 /* source filter not found, or count wrong =>  bug */
1459                 return -ESRCH;
1460         }
1461         psf->sf_count[sfmode]--;
1462         if (psf->sf_count[sfmode] == 0) {
1463                 ip_rt_multicast_event(pmc->interface);
1464         }
1465         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1466 #ifdef CONFIG_IP_MULTICAST
1467                 struct in_device *in_dev = pmc->interface;
1468 #endif
1469
1470                 /* no more filters for this source */
1471                 if (psf_prev)
1472                         psf_prev->sf_next = psf->sf_next;
1473                 else
1474                         pmc->sources = psf->sf_next;
1475 #ifdef CONFIG_IP_MULTICAST
1476                 if (psf->sf_oldin &&
1477                     !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1478                         psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1479                                 IGMP_Unsolicited_Report_Count;
1480                         psf->sf_next = pmc->tomb;
1481                         pmc->tomb = psf;
1482                         rv = 1;
1483                 } else
1484 #endif
1485                         kfree(psf);
1486         }
1487         return rv;
1488 }
1489
1490 #ifndef CONFIG_IP_MULTICAST
1491 #define igmp_ifc_event(x)       do { } while (0)
1492 #endif
1493
1494 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1495                          int sfcount, __be32 *psfsrc, int delta)
1496 {
1497         struct ip_mc_list *pmc;
1498         int     changerec = 0;
1499         int     i, err;
1500
1501         if (!in_dev)
1502                 return -ENODEV;
1503         read_lock(&in_dev->mc_list_lock);
1504         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1505                 if (*pmca == pmc->multiaddr)
1506                         break;
1507         }
1508         if (!pmc) {
1509                 /* MCA not found?? bug */
1510                 read_unlock(&in_dev->mc_list_lock);
1511                 return -ESRCH;
1512         }
1513         spin_lock_bh(&pmc->lock);
1514         read_unlock(&in_dev->mc_list_lock);
1515 #ifdef CONFIG_IP_MULTICAST
1516         sf_markstate(pmc);
1517 #endif
1518         if (!delta) {
1519                 err = -EINVAL;
1520                 if (!pmc->sfcount[sfmode])
1521                         goto out_unlock;
1522                 pmc->sfcount[sfmode]--;
1523         }
1524         err = 0;
1525         for (i=0; i<sfcount; i++) {
1526                 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1527
1528                 changerec |= rv > 0;
1529                 if (!err && rv < 0)
1530                         err = rv;
1531         }
1532         if (pmc->sfmode == MCAST_EXCLUDE &&
1533             pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1534             pmc->sfcount[MCAST_INCLUDE]) {
1535 #ifdef CONFIG_IP_MULTICAST
1536                 struct ip_sf_list *psf;
1537 #endif
1538
1539                 /* filter mode change */
1540                 pmc->sfmode = MCAST_INCLUDE;
1541 #ifdef CONFIG_IP_MULTICAST
1542                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1543                         IGMP_Unsolicited_Report_Count;
1544                 in_dev->mr_ifc_count = pmc->crcount;
1545                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1546                         psf->sf_crcount = 0;
1547                 igmp_ifc_event(pmc->interface);
1548         } else if (sf_setstate(pmc) || changerec) {
1549                 igmp_ifc_event(pmc->interface);
1550 #endif
1551         }
1552 out_unlock:
1553         spin_unlock_bh(&pmc->lock);
1554         return err;
1555 }
1556
1557 /*
1558  * Add multicast single-source filter to the interface list
1559  */
1560 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1561         __be32 *psfsrc, int delta)
1562 {
1563         struct ip_sf_list *psf, *psf_prev;
1564
1565         psf_prev = NULL;
1566         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1567                 if (psf->sf_inaddr == *psfsrc)
1568                         break;
1569                 psf_prev = psf;
1570         }
1571         if (!psf) {
1572                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1573                 if (!psf)
1574                         return -ENOBUFS;
1575                 psf->sf_inaddr = *psfsrc;
1576                 if (psf_prev) {
1577                         psf_prev->sf_next = psf;
1578                 } else
1579                         pmc->sources = psf;
1580         }
1581         psf->sf_count[sfmode]++;
1582         if (psf->sf_count[sfmode] == 1) {
1583                 ip_rt_multicast_event(pmc->interface);
1584         }
1585         return 0;
1586 }
1587
1588 #ifdef CONFIG_IP_MULTICAST
1589 static void sf_markstate(struct ip_mc_list *pmc)
1590 {
1591         struct ip_sf_list *psf;
1592         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1593
1594         for (psf=pmc->sources; psf; psf=psf->sf_next)
1595                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1596                         psf->sf_oldin = mca_xcount ==
1597                                 psf->sf_count[MCAST_EXCLUDE] &&
1598                                 !psf->sf_count[MCAST_INCLUDE];
1599                 } else
1600                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1601 }
1602
1603 static int sf_setstate(struct ip_mc_list *pmc)
1604 {
1605         struct ip_sf_list *psf, *dpsf;
1606         int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1607         int qrv = pmc->interface->mr_qrv;
1608         int new_in, rv;
1609
1610         rv = 0;
1611         for (psf=pmc->sources; psf; psf=psf->sf_next) {
1612                 if (pmc->sfcount[MCAST_EXCLUDE]) {
1613                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1614                                 !psf->sf_count[MCAST_INCLUDE];
1615                 } else
1616                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1617                 if (new_in) {
1618                         if (!psf->sf_oldin) {
1619                                 struct ip_sf_list *prev = NULL;
1620
1621                                 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1622                                         if (dpsf->sf_inaddr == psf->sf_inaddr)
1623                                                 break;
1624                                         prev = dpsf;
1625                                 }
1626                                 if (dpsf) {
1627                                         if (prev)
1628                                                 prev->sf_next = dpsf->sf_next;
1629                                         else
1630                                                 pmc->tomb = dpsf->sf_next;
1631                                         kfree(dpsf);
1632                                 }
1633                                 psf->sf_crcount = qrv;
1634                                 rv++;
1635                         }
1636                 } else if (psf->sf_oldin) {
1637
1638                         psf->sf_crcount = 0;
1639                         /*
1640                          * add or update "delete" records if an active filter
1641                          * is now inactive
1642                          */
1643                         for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1644                                 if (dpsf->sf_inaddr == psf->sf_inaddr)
1645                                         break;
1646                         if (!dpsf) {
1647                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1648                                 if (!dpsf)
1649                                         continue;
1650                                 *dpsf = *psf;
1651                                 /* pmc->lock held by callers */
1652                                 dpsf->sf_next = pmc->tomb;
1653                                 pmc->tomb = dpsf;
1654                         }
1655                         dpsf->sf_crcount = qrv;
1656                         rv++;
1657                 }
1658         }
1659         return rv;
1660 }
1661 #endif
1662
1663 /*
1664  * Add multicast source filter list to the interface list
1665  */
1666 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1667                          int sfcount, __be32 *psfsrc, int delta)
1668 {
1669         struct ip_mc_list *pmc;
1670         int     isexclude;
1671         int     i, err;
1672
1673         if (!in_dev)
1674                 return -ENODEV;
1675         read_lock(&in_dev->mc_list_lock);
1676         for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1677                 if (*pmca == pmc->multiaddr)
1678                         break;
1679         }
1680         if (!pmc) {
1681                 /* MCA not found?? bug */
1682                 read_unlock(&in_dev->mc_list_lock);
1683                 return -ESRCH;
1684         }
1685         spin_lock_bh(&pmc->lock);
1686         read_unlock(&in_dev->mc_list_lock);
1687
1688 #ifdef CONFIG_IP_MULTICAST
1689         sf_markstate(pmc);
1690 #endif
1691         isexclude = pmc->sfmode == MCAST_EXCLUDE;
1692         if (!delta)
1693                 pmc->sfcount[sfmode]++;
1694         err = 0;
1695         for (i=0; i<sfcount; i++) {
1696                 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1697                 if (err)
1698                         break;
1699         }
1700         if (err) {
1701                 int j;
1702
1703                 pmc->sfcount[sfmode]--;
1704                 for (j=0; j<i; j++)
1705                         (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1706         } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1707 #ifdef CONFIG_IP_MULTICAST
1708                 struct ip_sf_list *psf;
1709                 in_dev = pmc->interface;
1710 #endif
1711
1712                 /* filter mode change */
1713                 if (pmc->sfcount[MCAST_EXCLUDE])
1714                         pmc->sfmode = MCAST_EXCLUDE;
1715                 else if (pmc->sfcount[MCAST_INCLUDE])
1716                         pmc->sfmode = MCAST_INCLUDE;
1717 #ifdef CONFIG_IP_MULTICAST
1718                 /* else no filters; keep old mode for reports */
1719
1720                 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1721                         IGMP_Unsolicited_Report_Count;
1722                 in_dev->mr_ifc_count = pmc->crcount;
1723                 for (psf=pmc->sources; psf; psf = psf->sf_next)
1724                         psf->sf_crcount = 0;
1725                 igmp_ifc_event(in_dev);
1726         } else if (sf_setstate(pmc)) {
1727                 igmp_ifc_event(in_dev);
1728 #endif
1729         }
1730         spin_unlock_bh(&pmc->lock);
1731         return err;
1732 }
1733
1734 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1735 {
1736         struct ip_sf_list *psf, *nextpsf;
1737
1738         for (psf=pmc->tomb; psf; psf=nextpsf) {
1739                 nextpsf = psf->sf_next;
1740                 kfree(psf);
1741         }
1742         pmc->tomb = NULL;
1743         for (psf=pmc->sources; psf; psf=nextpsf) {
1744                 nextpsf = psf->sf_next;
1745                 kfree(psf);
1746         }
1747         pmc->sources = NULL;
1748         pmc->sfmode = MCAST_EXCLUDE;
1749         pmc->sfcount[MCAST_INCLUDE] = 0;
1750         pmc->sfcount[MCAST_EXCLUDE] = 1;
1751 }
1752
1753
1754 /*
1755  * Join a multicast group
1756  */
1757 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1758 {
1759         int err;
1760         __be32 addr = imr->imr_multiaddr.s_addr;
1761         struct ip_mc_socklist *iml = NULL, *i;
1762         struct in_device *in_dev;
1763         struct inet_sock *inet = inet_sk(sk);
1764         struct net *net = sock_net(sk);
1765         int ifindex;
1766         int count = 0;
1767
1768         if (!ipv4_is_multicast(addr))
1769                 return -EINVAL;
1770
1771         rtnl_lock();
1772
1773         in_dev = ip_mc_find_dev(net, imr);
1774
1775         if (!in_dev) {
1776                 iml = NULL;
1777                 err = -ENODEV;
1778                 goto done;
1779         }
1780
1781         err = -EADDRINUSE;
1782         ifindex = imr->imr_ifindex;
1783         for (i = inet->mc_list; i; i = i->next) {
1784                 if (i->multi.imr_multiaddr.s_addr == addr &&
1785                     i->multi.imr_ifindex == ifindex)
1786                         goto done;
1787                 count++;
1788         }
1789         err = -ENOBUFS;
1790         if (count >= sysctl_igmp_max_memberships)
1791                 goto done;
1792         iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1793         if (iml == NULL)
1794                 goto done;
1795
1796         memcpy(&iml->multi, imr, sizeof(*imr));
1797         iml->next = inet->mc_list;
1798         iml->sflist = NULL;
1799         iml->sfmode = MCAST_EXCLUDE;
1800         rcu_assign_pointer(inet->mc_list, iml);
1801         ip_mc_inc_group(in_dev, addr);
1802         err = 0;
1803 done:
1804         rtnl_unlock();
1805         return err;
1806 }
1807
1808 static void ip_sf_socklist_reclaim(struct rcu_head *rp)
1809 {
1810         struct ip_sf_socklist *psf;
1811
1812         psf = container_of(rp, struct ip_sf_socklist, rcu);
1813         /* sk_omem_alloc should have been decreased by the caller*/
1814         kfree(psf);
1815 }
1816
1817 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1818                            struct in_device *in_dev)
1819 {
1820         struct ip_sf_socklist *psf = iml->sflist;
1821         int err;
1822
1823         if (psf == NULL) {
1824                 /* any-source empty exclude case */
1825                 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1826                         iml->sfmode, 0, NULL, 0);
1827         }
1828         err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1829                         iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1830         rcu_assign_pointer(iml->sflist, NULL);
1831         /* decrease mem now to avoid the memleak warning */
1832         atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1833         call_rcu(&psf->rcu, ip_sf_socklist_reclaim);
1834         return err;
1835 }
1836
1837
1838 static void ip_mc_socklist_reclaim(struct rcu_head *rp)
1839 {
1840         struct ip_mc_socklist *iml;
1841
1842         iml = container_of(rp, struct ip_mc_socklist, rcu);
1843         /* sk_omem_alloc should have been decreased by the caller*/
1844         kfree(iml);
1845 }
1846
1847
1848 /*
1849  *      Ask a socket to leave a group.
1850  */
1851
1852 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1853 {
1854         struct inet_sock *inet = inet_sk(sk);
1855         struct ip_mc_socklist *iml, **imlp;
1856         struct in_device *in_dev;
1857         struct net *net = sock_net(sk);
1858         __be32 group = imr->imr_multiaddr.s_addr;
1859         u32 ifindex;
1860         int ret = -EADDRNOTAVAIL;
1861
1862         rtnl_lock();
1863         in_dev = ip_mc_find_dev(net, imr);
1864         ifindex = imr->imr_ifindex;
1865         for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1866                 if (iml->multi.imr_multiaddr.s_addr != group)
1867                         continue;
1868                 if (ifindex) {
1869                         if (iml->multi.imr_ifindex != ifindex)
1870                                 continue;
1871                 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1872                                 iml->multi.imr_address.s_addr)
1873                         continue;
1874
1875                 (void) ip_mc_leave_src(sk, iml, in_dev);
1876
1877                 rcu_assign_pointer(*imlp, iml->next);
1878
1879                 if (in_dev)
1880                         ip_mc_dec_group(in_dev, group);
1881                 rtnl_unlock();
1882                 /* decrease mem now to avoid the memleak warning */
1883                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1884                 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
1885                 return 0;
1886         }
1887         if (!in_dev)
1888                 ret = -ENODEV;
1889         rtnl_unlock();
1890         return ret;
1891 }
1892
1893 int ip_mc_source(int add, int omode, struct sock *sk, struct
1894         ip_mreq_source *mreqs, int ifindex)
1895 {
1896         int err;
1897         struct ip_mreqn imr;
1898         __be32 addr = mreqs->imr_multiaddr;
1899         struct ip_mc_socklist *pmc;
1900         struct in_device *in_dev = NULL;
1901         struct inet_sock *inet = inet_sk(sk);
1902         struct ip_sf_socklist *psl;
1903         struct net *net = sock_net(sk);
1904         int leavegroup = 0;
1905         int i, j, rv;
1906
1907         if (!ipv4_is_multicast(addr))
1908                 return -EINVAL;
1909
1910         rtnl_lock();
1911
1912         imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1913         imr.imr_address.s_addr = mreqs->imr_interface;
1914         imr.imr_ifindex = ifindex;
1915         in_dev = ip_mc_find_dev(net, &imr);
1916
1917         if (!in_dev) {
1918                 err = -ENODEV;
1919                 goto done;
1920         }
1921         err = -EADDRNOTAVAIL;
1922
1923         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1924                 if ((pmc->multi.imr_multiaddr.s_addr ==
1925                      imr.imr_multiaddr.s_addr) &&
1926                     (pmc->multi.imr_ifindex == imr.imr_ifindex))
1927                         break;
1928         }
1929         if (!pmc) {             /* must have a prior join */
1930                 err = -EINVAL;
1931                 goto done;
1932         }
1933         /* if a source filter was set, must be the same mode as before */
1934         if (pmc->sflist) {
1935                 if (pmc->sfmode != omode) {
1936                         err = -EINVAL;
1937                         goto done;
1938                 }
1939         } else if (pmc->sfmode != omode) {
1940                 /* allow mode switches for empty-set filters */
1941                 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1942                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1943                         NULL, 0);
1944                 pmc->sfmode = omode;
1945         }
1946
1947         psl = pmc->sflist;
1948         if (!add) {
1949                 if (!psl)
1950                         goto done;      /* err = -EADDRNOTAVAIL */
1951                 rv = !0;
1952                 for (i=0; i<psl->sl_count; i++) {
1953                         rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1954                                 sizeof(__be32));
1955                         if (rv == 0)
1956                                 break;
1957                 }
1958                 if (rv)         /* source not found */
1959                         goto done;      /* err = -EADDRNOTAVAIL */
1960
1961                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1962                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1963                         leavegroup = 1;
1964                         goto done;
1965                 }
1966
1967                 /* update the interface filter */
1968                 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1969                         &mreqs->imr_sourceaddr, 1);
1970
1971                 for (j=i+1; j<psl->sl_count; j++)
1972                         psl->sl_addr[j-1] = psl->sl_addr[j];
1973                 psl->sl_count--;
1974                 err = 0;
1975                 goto done;
1976         }
1977         /* else, add a new source to the filter */
1978
1979         if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1980                 err = -ENOBUFS;
1981                 goto done;
1982         }
1983         if (!psl || psl->sl_count == psl->sl_max) {
1984                 struct ip_sf_socklist *newpsl;
1985                 int count = IP_SFBLOCK;
1986
1987                 if (psl)
1988                         count += psl->sl_max;
1989                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1990                 if (!newpsl) {
1991                         err = -ENOBUFS;
1992                         goto done;
1993                 }
1994                 newpsl->sl_max = count;
1995                 newpsl->sl_count = count - IP_SFBLOCK;
1996                 if (psl) {
1997                         for (i=0; i<psl->sl_count; i++)
1998                                 newpsl->sl_addr[i] = psl->sl_addr[i];
1999                         /* decrease mem now to avoid the memleak warning */
2000                         atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2001                         call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2002                 }
2003                 rcu_assign_pointer(pmc->sflist, newpsl);
2004                 psl = newpsl;
2005         }
2006         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2007         for (i=0; i<psl->sl_count; i++) {
2008                 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2009                         sizeof(__be32));
2010                 if (rv == 0)
2011                         break;
2012         }
2013         if (rv == 0)            /* address already there is an error */
2014                 goto done;
2015         for (j=psl->sl_count-1; j>=i; j--)
2016                 psl->sl_addr[j+1] = psl->sl_addr[j];
2017         psl->sl_addr[i] = mreqs->imr_sourceaddr;
2018         psl->sl_count++;
2019         err = 0;
2020         /* update the interface list */
2021         ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2022                 &mreqs->imr_sourceaddr, 1);
2023 done:
2024         rtnl_unlock();
2025         if (leavegroup)
2026                 return ip_mc_leave_group(sk, &imr);
2027         return err;
2028 }
2029
2030 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2031 {
2032         int err = 0;
2033         struct ip_mreqn imr;
2034         __be32 addr = msf->imsf_multiaddr;
2035         struct ip_mc_socklist *pmc;
2036         struct in_device *in_dev;
2037         struct inet_sock *inet = inet_sk(sk);
2038         struct ip_sf_socklist *newpsl, *psl;
2039         struct net *net = sock_net(sk);
2040         int leavegroup = 0;
2041
2042         if (!ipv4_is_multicast(addr))
2043                 return -EINVAL;
2044         if (msf->imsf_fmode != MCAST_INCLUDE &&
2045             msf->imsf_fmode != MCAST_EXCLUDE)
2046                 return -EINVAL;
2047
2048         rtnl_lock();
2049
2050         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2051         imr.imr_address.s_addr = msf->imsf_interface;
2052         imr.imr_ifindex = ifindex;
2053         in_dev = ip_mc_find_dev(net, &imr);
2054
2055         if (!in_dev) {
2056                 err = -ENODEV;
2057                 goto done;
2058         }
2059
2060         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2061         if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2062                 leavegroup = 1;
2063                 goto done;
2064         }
2065
2066         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2067                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2068                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2069                         break;
2070         }
2071         if (!pmc) {             /* must have a prior join */
2072                 err = -EINVAL;
2073                 goto done;
2074         }
2075         if (msf->imsf_numsrc) {
2076                 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2077                                                            GFP_KERNEL);
2078                 if (!newpsl) {
2079                         err = -ENOBUFS;
2080                         goto done;
2081                 }
2082                 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2083                 memcpy(newpsl->sl_addr, msf->imsf_slist,
2084                         msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2085                 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2086                         msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2087                 if (err) {
2088                         sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2089                         goto done;
2090                 }
2091         } else {
2092                 newpsl = NULL;
2093                 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2094                                      msf->imsf_fmode, 0, NULL, 0);
2095         }
2096         psl = pmc->sflist;
2097         if (psl) {
2098                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2099                         psl->sl_count, psl->sl_addr, 0);
2100                 /* decrease mem now to avoid the memleak warning */
2101                 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2102                 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2103         } else
2104                 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2105                         0, NULL, 0);
2106         rcu_assign_pointer(pmc->sflist, newpsl);
2107         pmc->sfmode = msf->imsf_fmode;
2108         err = 0;
2109 done:
2110         rtnl_unlock();
2111         if (leavegroup)
2112                 err = ip_mc_leave_group(sk, &imr);
2113         return err;
2114 }
2115
2116 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2117         struct ip_msfilter __user *optval, int __user *optlen)
2118 {
2119         int err, len, count, copycount;
2120         struct ip_mreqn imr;
2121         __be32 addr = msf->imsf_multiaddr;
2122         struct ip_mc_socklist *pmc;
2123         struct in_device *in_dev;
2124         struct inet_sock *inet = inet_sk(sk);
2125         struct ip_sf_socklist *psl;
2126         struct net *net = sock_net(sk);
2127
2128         if (!ipv4_is_multicast(addr))
2129                 return -EINVAL;
2130
2131         rtnl_lock();
2132
2133         imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2134         imr.imr_address.s_addr = msf->imsf_interface;
2135         imr.imr_ifindex = 0;
2136         in_dev = ip_mc_find_dev(net, &imr);
2137
2138         if (!in_dev) {
2139                 err = -ENODEV;
2140                 goto done;
2141         }
2142         err = -EADDRNOTAVAIL;
2143
2144         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2145                 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2146                     pmc->multi.imr_ifindex == imr.imr_ifindex)
2147                         break;
2148         }
2149         if (!pmc)               /* must have a prior join */
2150                 goto done;
2151         msf->imsf_fmode = pmc->sfmode;
2152         psl = pmc->sflist;
2153         rtnl_unlock();
2154         if (!psl) {
2155                 len = 0;
2156                 count = 0;
2157         } else {
2158                 count = psl->sl_count;
2159         }
2160         copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2161         len = copycount * sizeof(psl->sl_addr[0]);
2162         msf->imsf_numsrc = count;
2163         if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2164             copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2165                 return -EFAULT;
2166         }
2167         if (len &&
2168             copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2169                 return -EFAULT;
2170         return 0;
2171 done:
2172         rtnl_unlock();
2173         return err;
2174 }
2175
2176 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2177         struct group_filter __user *optval, int __user *optlen)
2178 {
2179         int err, i, count, copycount;
2180         struct sockaddr_in *psin;
2181         __be32 addr;
2182         struct ip_mc_socklist *pmc;
2183         struct inet_sock *inet = inet_sk(sk);
2184         struct ip_sf_socklist *psl;
2185
2186         psin = (struct sockaddr_in *)&gsf->gf_group;
2187         if (psin->sin_family != AF_INET)
2188                 return -EINVAL;
2189         addr = psin->sin_addr.s_addr;
2190         if (!ipv4_is_multicast(addr))
2191                 return -EINVAL;
2192
2193         rtnl_lock();
2194
2195         err = -EADDRNOTAVAIL;
2196
2197         for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2198                 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2199                     pmc->multi.imr_ifindex == gsf->gf_interface)
2200                         break;
2201         }
2202         if (!pmc)               /* must have a prior join */
2203                 goto done;
2204         gsf->gf_fmode = pmc->sfmode;
2205         psl = pmc->sflist;
2206         rtnl_unlock();
2207         count = psl ? psl->sl_count : 0;
2208         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2209         gsf->gf_numsrc = count;
2210         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2211             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2212                 return -EFAULT;
2213         }
2214         for (i=0; i<copycount; i++) {
2215                 struct sockaddr_storage ss;
2216
2217                 psin = (struct sockaddr_in *)&ss;
2218                 memset(&ss, 0, sizeof(ss));
2219                 psin->sin_family = AF_INET;
2220                 psin->sin_addr.s_addr = psl->sl_addr[i];
2221                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2222                         return -EFAULT;
2223         }
2224         return 0;
2225 done:
2226         rtnl_unlock();
2227         return err;
2228 }
2229
2230 /*
2231  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2232  */
2233 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2234 {
2235         struct inet_sock *inet = inet_sk(sk);
2236         struct ip_mc_socklist *pmc;
2237         struct ip_sf_socklist *psl;
2238         int i;
2239         int ret;
2240
2241         ret = 1;
2242         if (!ipv4_is_multicast(loc_addr))
2243                 goto out;
2244
2245         rcu_read_lock();
2246         for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) {
2247                 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2248                     pmc->multi.imr_ifindex == dif)
2249                         break;
2250         }
2251         ret = inet->mc_all;
2252         if (!pmc)
2253                 goto unlock;
2254         psl = pmc->sflist;
2255         ret = (pmc->sfmode == MCAST_EXCLUDE);
2256         if (!psl)
2257                 goto unlock;
2258
2259         for (i=0; i<psl->sl_count; i++) {
2260                 if (psl->sl_addr[i] == rmt_addr)
2261                         break;
2262         }
2263         ret = 0;
2264         if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2265                 goto unlock;
2266         if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2267                 goto unlock;
2268         ret = 1;
2269 unlock:
2270         rcu_read_unlock();
2271 out:
2272         return ret;
2273 }
2274
2275 /*
2276  *      A socket is closing.
2277  */
2278
2279 void ip_mc_drop_socket(struct sock *sk)
2280 {
2281         struct inet_sock *inet = inet_sk(sk);
2282         struct ip_mc_socklist *iml;
2283         struct net *net = sock_net(sk);
2284
2285         if (inet->mc_list == NULL)
2286                 return;
2287
2288         rtnl_lock();
2289         while ((iml = inet->mc_list) != NULL) {
2290                 struct in_device *in_dev;
2291                 rcu_assign_pointer(inet->mc_list, iml->next);
2292
2293                 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2294                 (void) ip_mc_leave_src(sk, iml, in_dev);
2295                 if (in_dev != NULL) {
2296                         ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2297                         in_dev_put(in_dev);
2298                 }
2299                 /* decrease mem now to avoid the memleak warning */
2300                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2301                 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
2302         }
2303         rtnl_unlock();
2304 }
2305
2306 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2307 {
2308         struct ip_mc_list *im;
2309         struct ip_sf_list *psf;
2310         int rv = 0;
2311
2312         read_lock(&in_dev->mc_list_lock);
2313         for (im=in_dev->mc_list; im; im=im->next) {
2314                 if (im->multiaddr == mc_addr)
2315                         break;
2316         }
2317         if (im && proto == IPPROTO_IGMP) {
2318                 rv = 1;
2319         } else if (im) {
2320                 if (src_addr) {
2321                         for (psf=im->sources; psf; psf=psf->sf_next) {
2322                                 if (psf->sf_inaddr == src_addr)
2323                                         break;
2324                         }
2325                         if (psf)
2326                                 rv = psf->sf_count[MCAST_INCLUDE] ||
2327                                         psf->sf_count[MCAST_EXCLUDE] !=
2328                                         im->sfcount[MCAST_EXCLUDE];
2329                         else
2330                                 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2331                 } else
2332                         rv = 1; /* unspecified source; tentatively allow */
2333         }
2334         read_unlock(&in_dev->mc_list_lock);
2335         return rv;
2336 }
2337
2338 #if defined(CONFIG_PROC_FS)
2339 struct igmp_mc_iter_state {
2340         struct seq_net_private p;
2341         struct net_device *dev;
2342         struct in_device *in_dev;
2343 };
2344
2345 #define igmp_mc_seq_private(seq)        ((struct igmp_mc_iter_state *)(seq)->private)
2346
2347 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2348 {
2349         struct net *net = seq_file_net(seq);
2350         struct ip_mc_list *im = NULL;
2351         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2352
2353         state->in_dev = NULL;
2354         for_each_netdev_rcu(net, state->dev) {
2355                 struct in_device *in_dev;
2356
2357                 in_dev = __in_dev_get_rcu(state->dev);
2358                 if (!in_dev)
2359                         continue;
2360                 read_lock(&in_dev->mc_list_lock);
2361                 im = in_dev->mc_list;
2362                 if (im) {
2363                         state->in_dev = in_dev;
2364                         break;
2365                 }
2366                 read_unlock(&in_dev->mc_list_lock);
2367         }
2368         return im;
2369 }
2370
2371 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2372 {
2373         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2374         im = im->next;
2375         while (!im) {
2376                 if (likely(state->in_dev != NULL))
2377                         read_unlock(&state->in_dev->mc_list_lock);
2378
2379                 state->dev = next_net_device_rcu(state->dev);
2380                 if (!state->dev) {
2381                         state->in_dev = NULL;
2382                         break;
2383                 }
2384                 state->in_dev = __in_dev_get_rcu(state->dev);
2385                 if (!state->in_dev)
2386                         continue;
2387                 read_lock(&state->in_dev->mc_list_lock);
2388                 im = state->in_dev->mc_list;
2389         }
2390         return im;
2391 }
2392
2393 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2394 {
2395         struct ip_mc_list *im = igmp_mc_get_first(seq);
2396         if (im)
2397                 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2398                         --pos;
2399         return pos ? NULL : im;
2400 }
2401
2402 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2403         __acquires(rcu)
2404 {
2405         rcu_read_lock();
2406         return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2407 }
2408
2409 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2410 {
2411         struct ip_mc_list *im;
2412         if (v == SEQ_START_TOKEN)
2413                 im = igmp_mc_get_first(seq);
2414         else
2415                 im = igmp_mc_get_next(seq, v);
2416         ++*pos;
2417         return im;
2418 }
2419
2420 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2421         __releases(rcu)
2422 {
2423         struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2424         if (likely(state->in_dev != NULL)) {
2425                 read_unlock(&state->in_dev->mc_list_lock);
2426                 state->in_dev = NULL;
2427         }
2428         state->dev = NULL;
2429         rcu_read_unlock();
2430 }
2431
2432 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2433 {
2434         if (v == SEQ_START_TOKEN)
2435                 seq_puts(seq,
2436                          "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2437         else {
2438                 struct ip_mc_list *im = (struct ip_mc_list *)v;
2439                 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2440                 char   *querier;
2441 #ifdef CONFIG_IP_MULTICAST
2442                 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2443                           IGMP_V2_SEEN(state->in_dev) ? "V2" :
2444                           "V3";
2445 #else
2446                 querier = "NONE";
2447 #endif
2448
2449                 if (state->in_dev->mc_list == im) {
2450                         seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2451                                    state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2452                 }
2453
2454                 seq_printf(seq,
2455                            "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2456                            im->multiaddr, im->users,
2457                            im->tm_running, im->tm_running ?
2458                            jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2459                            im->reporter);
2460         }
2461         return 0;
2462 }
2463
2464 static const struct seq_operations igmp_mc_seq_ops = {
2465         .start  =       igmp_mc_seq_start,
2466         .next   =       igmp_mc_seq_next,
2467         .stop   =       igmp_mc_seq_stop,
2468         .show   =       igmp_mc_seq_show,
2469 };
2470
2471 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2472 {
2473         return seq_open_net(inode, file, &igmp_mc_seq_ops,
2474                         sizeof(struct igmp_mc_iter_state));
2475 }
2476
2477 static const struct file_operations igmp_mc_seq_fops = {
2478         .owner          =       THIS_MODULE,
2479         .open           =       igmp_mc_seq_open,
2480         .read           =       seq_read,
2481         .llseek         =       seq_lseek,
2482         .release        =       seq_release_net,
2483 };
2484
2485 struct igmp_mcf_iter_state {
2486         struct seq_net_private p;
2487         struct net_device *dev;
2488         struct in_device *idev;
2489         struct ip_mc_list *im;
2490 };
2491
2492 #define igmp_mcf_seq_private(seq)       ((struct igmp_mcf_iter_state *)(seq)->private)
2493
2494 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2495 {
2496         struct net *net = seq_file_net(seq);
2497         struct ip_sf_list *psf = NULL;
2498         struct ip_mc_list *im = NULL;
2499         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2500
2501         state->idev = NULL;
2502         state->im = NULL;
2503         for_each_netdev_rcu(net, state->dev) {
2504                 struct in_device *idev;
2505                 idev = __in_dev_get_rcu(state->dev);
2506                 if (unlikely(idev == NULL))
2507                         continue;
2508                 read_lock(&idev->mc_list_lock);
2509                 im = idev->mc_list;
2510                 if (likely(im != NULL)) {
2511                         spin_lock_bh(&im->lock);
2512                         psf = im->sources;
2513                         if (likely(psf != NULL)) {
2514                                 state->im = im;
2515                                 state->idev = idev;
2516                                 break;
2517                         }
2518                         spin_unlock_bh(&im->lock);
2519                 }
2520                 read_unlock(&idev->mc_list_lock);
2521         }
2522         return psf;
2523 }
2524
2525 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2526 {
2527         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2528
2529         psf = psf->sf_next;
2530         while (!psf) {
2531                 spin_unlock_bh(&state->im->lock);
2532                 state->im = state->im->next;
2533                 while (!state->im) {
2534                         if (likely(state->idev != NULL))
2535                                 read_unlock(&state->idev->mc_list_lock);
2536
2537                         state->dev = next_net_device_rcu(state->dev);
2538                         if (!state->dev) {
2539                                 state->idev = NULL;
2540                                 goto out;
2541                         }
2542                         state->idev = __in_dev_get_rcu(state->dev);
2543                         if (!state->idev)
2544                                 continue;
2545                         read_lock(&state->idev->mc_list_lock);
2546                         state->im = state->idev->mc_list;
2547                 }
2548                 if (!state->im)
2549                         break;
2550                 spin_lock_bh(&state->im->lock);
2551                 psf = state->im->sources;
2552         }
2553 out:
2554         return psf;
2555 }
2556
2557 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2558 {
2559         struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2560         if (psf)
2561                 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2562                         --pos;
2563         return pos ? NULL : psf;
2564 }
2565
2566 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2567         __acquires(rcu)
2568 {
2569         rcu_read_lock();
2570         return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2571 }
2572
2573 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2574 {
2575         struct ip_sf_list *psf;
2576         if (v == SEQ_START_TOKEN)
2577                 psf = igmp_mcf_get_first(seq);
2578         else
2579                 psf = igmp_mcf_get_next(seq, v);
2580         ++*pos;
2581         return psf;
2582 }
2583
2584 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2585         __releases(rcu)
2586 {
2587         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2588         if (likely(state->im != NULL)) {
2589                 spin_unlock_bh(&state->im->lock);
2590                 state->im = NULL;
2591         }
2592         if (likely(state->idev != NULL)) {
2593                 read_unlock(&state->idev->mc_list_lock);
2594                 state->idev = NULL;
2595         }
2596         state->dev = NULL;
2597         rcu_read_unlock();
2598 }
2599
2600 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2601 {
2602         struct ip_sf_list *psf = (struct ip_sf_list *)v;
2603         struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2604
2605         if (v == SEQ_START_TOKEN) {
2606                 seq_printf(seq,
2607                            "%3s %6s "
2608                            "%10s %10s %6s %6s\n", "Idx",
2609                            "Device", "MCA",
2610                            "SRC", "INC", "EXC");
2611         } else {
2612                 seq_printf(seq,
2613                            "%3d %6.6s 0x%08x "
2614                            "0x%08x %6lu %6lu\n",
2615                            state->dev->ifindex, state->dev->name,
2616                            ntohl(state->im->multiaddr),
2617                            ntohl(psf->sf_inaddr),
2618                            psf->sf_count[MCAST_INCLUDE],
2619                            psf->sf_count[MCAST_EXCLUDE]);
2620         }
2621         return 0;
2622 }
2623
2624 static const struct seq_operations igmp_mcf_seq_ops = {
2625         .start  =       igmp_mcf_seq_start,
2626         .next   =       igmp_mcf_seq_next,
2627         .stop   =       igmp_mcf_seq_stop,
2628         .show   =       igmp_mcf_seq_show,
2629 };
2630
2631 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2632 {
2633         return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2634                         sizeof(struct igmp_mcf_iter_state));
2635 }
2636
2637 static const struct file_operations igmp_mcf_seq_fops = {
2638         .owner          =       THIS_MODULE,
2639         .open           =       igmp_mcf_seq_open,
2640         .read           =       seq_read,
2641         .llseek         =       seq_lseek,
2642         .release        =       seq_release_net,
2643 };
2644
2645 static int __net_init igmp_net_init(struct net *net)
2646 {
2647         struct proc_dir_entry *pde;
2648
2649         pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2650         if (!pde)
2651                 goto out_igmp;
2652         pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2653         if (!pde)
2654                 goto out_mcfilter;
2655         return 0;
2656
2657 out_mcfilter:
2658         proc_net_remove(net, "igmp");
2659 out_igmp:
2660         return -ENOMEM;
2661 }
2662
2663 static void __net_exit igmp_net_exit(struct net *net)
2664 {
2665         proc_net_remove(net, "mcfilter");
2666         proc_net_remove(net, "igmp");
2667 }
2668
2669 static struct pernet_operations igmp_net_ops = {
2670         .init = igmp_net_init,
2671         .exit = igmp_net_exit,
2672 };
2673
2674 int __init igmp_mc_proc_init(void)
2675 {
2676         return register_pernet_subsys(&igmp_net_ops);
2677 }
2678 #endif
2679
2680 EXPORT_SYMBOL(ip_mc_dec_group);
2681 EXPORT_SYMBOL(ip_mc_inc_group);
2682 EXPORT_SYMBOL(ip_mc_join_group);
2683 EXPORT_SYMBOL(ip_mc_rejoin_group);