net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <net/mld.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/net_namespace.h>
  53 #include <net/sock.h>
  54 #include <net/snmp.h>
  55
  56 #include <net/ipv6.h>
  57 #include <net/protocol.h>
  58 #include <net/if_inet6.h>
  59 #include <net/ndisc.h>
  60 #include <net/addrconf.h>
  61 #include <net/ip6_route.h>
  62 #include <net/inet_common.h>
  63
  64 #include <net/ip6_checksum.h>
  65
  66 /* Set to 3 to get tracing... */
  67 #define MCAST_DEBUG 2
  68
  69 #if MCAST_DEBUG >= 3
  70 #define MDBG(x) printk x
  71 #else
  72 #define MDBG(x)
  73 #endif
  74
  75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  77         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  80 };
  81
  82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84 /* Big mc list lock for all the sockets */
  85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  86
  87 static void igmp6_join_group(struct ifmcaddr6 *ma);
  88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89 static void igmp6_timer_handler(unsigned long data);
  90
  91 static void mld_gq_timer_expire(unsigned long data);
  92 static void mld_ifc_timer_expire(unsigned long data);
  93 static void mld_ifc_event(struct inet6_dev *idev);
  94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
  96 static void mld_clear_delrec(struct inet6_dev *idev);
  97 static int sf_setstate(struct ifmcaddr6 *pmc);
  98 static void sf_markstate(struct ifmcaddr6 *pmc);
  99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 101                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 102                           int delta);
 103 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 104                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 105                           int delta);
 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 107                             struct inet6_dev *idev);
 108
 109
 110 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 111 #define MLD_QRV_DEFAULT         2
 112
 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 114                 (idev)->cnf.force_mld_version == 1 || \
 115                 ((idev)->mc_v1_seen && \
 116                 time_before(jiffies, (idev)->mc_v1_seen)))
 117
 118 #define IPV6_MLD_MAX_MSF        64
 119
 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 121
 122 /*
 123  *      socket join on multicast group
 124  */
 125
 126 #define for_each_pmc_rcu(np, pmc)                               \
 127         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 128              pmc != NULL;                                       \
 129              pmc = rcu_dereference(pmc->next))
 130
 131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 132 {
 133         struct net_device *dev = NULL;
 134         struct ipv6_mc_socklist *mc_lst;
 135         struct ipv6_pinfo *np = inet6_sk(sk);
 136         struct net *net = sock_net(sk);
 137         int err;
 138
 139         if (!ipv6_addr_is_multicast(addr))
 140                 return -EINVAL;
 141
 142         rcu_read_lock();
 143         for_each_pmc_rcu(np, mc_lst) {
 144                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 145                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 146                         rcu_read_unlock();
 147                         return -EADDRINUSE;
 148                 }
 149         }
 150         rcu_read_unlock();
 151
 152         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 153
 154         if (mc_lst == NULL)
 155                 return -ENOMEM;
 156
 157         mc_lst->next = NULL;
 158         ipv6_addr_copy(&mc_lst->addr, addr);
 159
 160         rcu_read_lock();
 161         if (ifindex == 0) {
 162                 struct rt6_info *rt;
 163                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 164                 if (rt) {
 165                         dev = rt->rt6i_dev;
 166                         dst_release(&rt->dst);
 167                 }
 168         } else
 169                 dev = dev_get_by_index_rcu(net, ifindex);
 170
 171         if (dev == NULL) {
 172                 rcu_read_unlock();
 173                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 174                 return -ENODEV;
 175         }
 176
 177         mc_lst->ifindex = dev->ifindex;
 178         mc_lst->sfmode = MCAST_EXCLUDE;
 179         rwlock_init(&mc_lst->sflock);
 180         mc_lst->sflist = NULL;
 181
 182         /*
 183          *      now add/increase the group membership on the device
 184          */
 185
 186         err = ipv6_dev_mc_inc(dev, addr);
 187
 188         if (err) {
 189                 rcu_read_unlock();
 190                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 191                 return err;
 192         }
 193
 194         spin_lock(&ipv6_sk_mc_lock);
 195         mc_lst->next = np->ipv6_mc_list;
 196         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 197         spin_unlock(&ipv6_sk_mc_lock);
 198
 199         rcu_read_unlock();
 200
 201         return 0;
 202 }
 203
 204 static void ipv6_mc_socklist_reclaim(struct rcu_head *head)
 205 {
 206         kfree(container_of(head, struct ipv6_mc_socklist, rcu));
 207 }
 208 /*
 209  *      socket leave on multicast group
 210  */
 211 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 212 {
 213         struct ipv6_pinfo *np = inet6_sk(sk);
 214         struct ipv6_mc_socklist *mc_lst;
 215         struct ipv6_mc_socklist __rcu **lnk;
 216         struct net *net = sock_net(sk);
 217
 218         spin_lock(&ipv6_sk_mc_lock);
 219         for (lnk = &np->ipv6_mc_list;
 220              (mc_lst = rcu_dereference_protected(*lnk,
 221                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 222               lnk = &mc_lst->next) {
 223                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 224                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 225                         struct net_device *dev;
 226
 227                         *lnk = mc_lst->next;
 228                         spin_unlock(&ipv6_sk_mc_lock);
 229
 230                         rcu_read_lock();
 231                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 232                         if (dev != NULL) {
 233                                 struct inet6_dev *idev = __in6_dev_get(dev);
 234
 235                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 236                                 if (idev)
 237                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 238                         } else
 239                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 240                         rcu_read_unlock();
 241                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 242                         call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim);
 243                         return 0;
 244                 }
 245         }
 246         spin_unlock(&ipv6_sk_mc_lock);
 247
 248         return -EADDRNOTAVAIL;
 249 }
 250
 251 /* called with rcu_read_lock() */
 252 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 253                                              struct in6_addr *group,
 254                                              int ifindex)
 255 {
 256         struct net_device *dev = NULL;
 257         struct inet6_dev *idev = NULL;
 258
 259         if (ifindex == 0) {
 260                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 261
 262                 if (rt) {
 263                         dev = rt->rt6i_dev;
 264                         dev_hold(dev);
 265                         dst_release(&rt->dst);
 266                 }
 267         } else
 268                 dev = dev_get_by_index_rcu(net, ifindex);
 269
 270         if (!dev)
 271                 return NULL;
 272         idev = __in6_dev_get(dev);
 273         if (!idev)
 274                 return NULL;
 275         read_lock_bh(&idev->lock);
 276         if (idev->dead) {
 277                 read_unlock_bh(&idev->lock);
 278                 return NULL;
 279         }
 280         return idev;
 281 }
 282
 283 void ipv6_sock_mc_close(struct sock *sk)
 284 {
 285         struct ipv6_pinfo *np = inet6_sk(sk);
 286         struct ipv6_mc_socklist *mc_lst;
 287         struct net *net = sock_net(sk);
 288
 289         spin_lock(&ipv6_sk_mc_lock);
 290         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 291                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 292                 struct net_device *dev;
 293
 294                 np->ipv6_mc_list = mc_lst->next;
 295                 spin_unlock(&ipv6_sk_mc_lock);
 296
 297                 rcu_read_lock();
 298                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 299                 if (dev) {
 300                         struct inet6_dev *idev = __in6_dev_get(dev);
 301
 302                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 303                         if (idev)
 304                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 305                 } else
 306                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 307                 rcu_read_unlock();
 308
 309                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 310                 call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim);
 311
 312                 spin_lock(&ipv6_sk_mc_lock);
 313         }
 314         spin_unlock(&ipv6_sk_mc_lock);
 315 }
 316
 317 int ip6_mc_source(int add, int omode, struct sock *sk,
 318         struct group_source_req *pgsr)
 319 {
 320         struct in6_addr *source, *group;
 321         struct ipv6_mc_socklist *pmc;
 322         struct net_device *dev;
 323         struct inet6_dev *idev;
 324         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 325         struct ip6_sf_socklist *psl;
 326         struct net *net = sock_net(sk);
 327         int i, j, rv;
 328         int leavegroup = 0;
 329         int pmclocked = 0;
 330         int err;
 331
 332         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 333         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 334
 335         if (!ipv6_addr_is_multicast(group))
 336                 return -EINVAL;
 337
 338         rcu_read_lock();
 339         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 340         if (!idev) {
 341                 rcu_read_unlock();
 342                 return -ENODEV;
 343         }
 344         dev = idev->dev;
 345
 346         err = -EADDRNOTAVAIL;
 347
 348         for_each_pmc_rcu(inet6, pmc) {
 349                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 350                         continue;
 351                 if (ipv6_addr_equal(&pmc->addr, group))
 352                         break;
 353         }
 354         if (!pmc) {             /* must have a prior join */
 355                 err = -EINVAL;
 356                 goto done;
 357         }
 358         /* if a source filter was set, must be the same mode as before */
 359         if (pmc->sflist) {
 360                 if (pmc->sfmode != omode) {
 361                         err = -EINVAL;
 362                         goto done;
 363                 }
 364         } else if (pmc->sfmode != omode) {
 365                 /* allow mode switches for empty-set filters */
 366                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 367                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 368                 pmc->sfmode = omode;
 369         }
 370
 371         write_lock(&pmc->sflock);
 372         pmclocked = 1;
 373
 374         psl = pmc->sflist;
 375         if (!add) {
 376                 if (!psl)
 377                         goto done;      /* err = -EADDRNOTAVAIL */
 378                 rv = !0;
 379                 for (i=0; i<psl->sl_count; i++) {
 380                         rv = memcmp(&psl->sl_addr[i], source,
 381                                 sizeof(struct in6_addr));
 382                         if (rv == 0)
 383                                 break;
 384                 }
 385                 if (rv)         /* source not found */
 386                         goto done;      /* err = -EADDRNOTAVAIL */
 387
 388                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 389                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 390                         leavegroup = 1;
 391                         goto done;
 392                 }
 393
 394                 /* update the interface filter */
 395                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 396
 397                 for (j=i+1; j<psl->sl_count; j++)
 398                         psl->sl_addr[j-1] = psl->sl_addr[j];
 399                 psl->sl_count--;
 400                 err = 0;
 401                 goto done;
 402         }
 403         /* else, add a new source to the filter */
 404
 405         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 406                 err = -ENOBUFS;
 407                 goto done;
 408         }
 409         if (!psl || psl->sl_count == psl->sl_max) {
 410                 struct ip6_sf_socklist *newpsl;
 411                 int count = IP6_SFBLOCK;
 412
 413                 if (psl)
 414                         count += psl->sl_max;
 415                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 416                 if (!newpsl) {
 417                         err = -ENOBUFS;
 418                         goto done;
 419                 }
 420                 newpsl->sl_max = count;
 421                 newpsl->sl_count = count - IP6_SFBLOCK;
 422                 if (psl) {
 423                         for (i=0; i<psl->sl_count; i++)
 424                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 425                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 426                 }
 427                 pmc->sflist = psl = newpsl;
 428         }
 429         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 430         for (i=0; i<psl->sl_count; i++) {
 431                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 432                 if (rv == 0)
 433                         break;
 434         }
 435         if (rv == 0)            /* address already there is an error */
 436                 goto done;
 437         for (j=psl->sl_count-1; j>=i; j--)
 438                 psl->sl_addr[j+1] = psl->sl_addr[j];
 439         psl->sl_addr[i] = *source;
 440         psl->sl_count++;
 441         err = 0;
 442         /* update the interface list */
 443         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 444 done:
 445         if (pmclocked)
 446                 write_unlock(&pmc->sflock);
 447         read_unlock_bh(&idev->lock);
 448         rcu_read_unlock();
 449         if (leavegroup)
 450                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 451         return err;
 452 }
 453
 454 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 455 {
 456         struct in6_addr *group;
 457         struct ipv6_mc_socklist *pmc;
 458         struct net_device *dev;
 459         struct inet6_dev *idev;
 460         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 461         struct ip6_sf_socklist *newpsl, *psl;
 462         struct net *net = sock_net(sk);
 463         int leavegroup = 0;
 464         int i, err;
 465
 466         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 467
 468         if (!ipv6_addr_is_multicast(group))
 469                 return -EINVAL;
 470         if (gsf->gf_fmode != MCAST_INCLUDE &&
 471             gsf->gf_fmode != MCAST_EXCLUDE)
 472                 return -EINVAL;
 473
 474         rcu_read_lock();
 475         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 476
 477         if (!idev) {
 478                 rcu_read_unlock();
 479                 return -ENODEV;
 480         }
 481         dev = idev->dev;
 482
 483         err = 0;
 484
 485         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 486                 leavegroup = 1;
 487                 goto done;
 488         }
 489
 490         for_each_pmc_rcu(inet6, pmc) {
 491                 if (pmc->ifindex != gsf->gf_interface)
 492                         continue;
 493                 if (ipv6_addr_equal(&pmc->addr, group))
 494                         break;
 495         }
 496         if (!pmc) {             /* must have a prior join */
 497                 err = -EINVAL;
 498                 goto done;
 499         }
 500         if (gsf->gf_numsrc) {
 501                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 502                                                           GFP_ATOMIC);
 503                 if (!newpsl) {
 504                         err = -ENOBUFS;
 505                         goto done;
 506                 }
 507                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 508                 for (i=0; i<newpsl->sl_count; ++i) {
 509                         struct sockaddr_in6 *psin6;
 510
 511                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 512                         newpsl->sl_addr[i] = psin6->sin6_addr;
 513                 }
 514                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 515                         newpsl->sl_count, newpsl->sl_addr, 0);
 516                 if (err) {
 517                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 518                         goto done;
 519                 }
 520         } else {
 521                 newpsl = NULL;
 522                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 523         }
 524
 525         write_lock(&pmc->sflock);
 526         psl = pmc->sflist;
 527         if (psl) {
 528                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 529                         psl->sl_count, psl->sl_addr, 0);
 530                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 531         } else
 532                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 533         pmc->sflist = newpsl;
 534         pmc->sfmode = gsf->gf_fmode;
 535         write_unlock(&pmc->sflock);
 536         err = 0;
 537 done:
 538         read_unlock_bh(&idev->lock);
 539         rcu_read_unlock();
 540         if (leavegroup)
 541                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 542         return err;
 543 }
 544
 545 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 546         struct group_filter __user *optval, int __user *optlen)
 547 {
 548         int err, i, count, copycount;
 549         struct in6_addr *group;
 550         struct ipv6_mc_socklist *pmc;
 551         struct inet6_dev *idev;
 552         struct net_device *dev;
 553         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 554         struct ip6_sf_socklist *psl;
 555         struct net *net = sock_net(sk);
 556
 557         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 558
 559         if (!ipv6_addr_is_multicast(group))
 560                 return -EINVAL;
 561
 562         rcu_read_lock();
 563         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 564
 565         if (!idev) {
 566                 rcu_read_unlock();
 567                 return -ENODEV;
 568         }
 569         dev = idev->dev;
 570
 571         err = -EADDRNOTAVAIL;
 572         /*
 573          * changes to the ipv6_mc_list require the socket lock and
 574          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 575          * so reading the list is safe.
 576          */
 577
 578         for_each_pmc_rcu(inet6, pmc) {
 579                 if (pmc->ifindex != gsf->gf_interface)
 580                         continue;
 581                 if (ipv6_addr_equal(group, &pmc->addr))
 582                         break;
 583         }
 584         if (!pmc)               /* must have a prior join */
 585                 goto done;
 586         gsf->gf_fmode = pmc->sfmode;
 587         psl = pmc->sflist;
 588         count = psl ? psl->sl_count : 0;
 589         read_unlock_bh(&idev->lock);
 590         rcu_read_unlock();
 591
 592         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 593         gsf->gf_numsrc = count;
 594         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 595             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 596                 return -EFAULT;
 597         }
 598         /* changes to psl require the socket lock, a read lock on
 599          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 600          * have the socket lock, so reading here is safe.
 601          */
 602         for (i=0; i<copycount; i++) {
 603                 struct sockaddr_in6 *psin6;
 604                 struct sockaddr_storage ss;
 605
 606                 psin6 = (struct sockaddr_in6 *)&ss;
 607                 memset(&ss, 0, sizeof(ss));
 608                 psin6->sin6_family = AF_INET6;
 609                 psin6->sin6_addr = psl->sl_addr[i];
 610                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 611                         return -EFAULT;
 612         }
 613         return 0;
 614 done:
 615         read_unlock_bh(&idev->lock);
 616         rcu_read_unlock();
 617         return err;
 618 }
 619
 620 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 621                    const struct in6_addr *src_addr)
 622 {
 623         struct ipv6_pinfo *np = inet6_sk(sk);
 624         struct ipv6_mc_socklist *mc;
 625         struct ip6_sf_socklist *psl;
 626         int rv = 1;
 627
 628         rcu_read_lock();
 629         for_each_pmc_rcu(np, mc) {
 630                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 631                         break;
 632         }
 633         if (!mc) {
 634                 rcu_read_unlock();
 635                 return 1;
 636         }
 637         read_lock(&mc->sflock);
 638         psl = mc->sflist;
 639         if (!psl) {
 640                 rv = mc->sfmode == MCAST_EXCLUDE;
 641         } else {
 642                 int i;
 643
 644                 for (i=0; i<psl->sl_count; i++) {
 645                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 646                                 break;
 647                 }
 648                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 649                         rv = 0;
 650                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 651                         rv = 0;
 652         }
 653         read_unlock(&mc->sflock);
 654         rcu_read_unlock();
 655
 656         return rv;
 657 }
 658
 659 static void ma_put(struct ifmcaddr6 *mc)
 660 {
 661         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 662                 in6_dev_put(mc->idev);
 663                 kfree(mc);
 664         }
 665 }
 666
 667 static void igmp6_group_added(struct ifmcaddr6 *mc)
 668 {
 669         struct net_device *dev = mc->idev->dev;
 670         char buf[MAX_ADDR_LEN];
 671
 672         spin_lock_bh(&mc->mca_lock);
 673         if (!(mc->mca_flags&MAF_LOADED)) {
 674                 mc->mca_flags |= MAF_LOADED;
 675                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 676                         dev_mc_add(dev, buf);
 677         }
 678         spin_unlock_bh(&mc->mca_lock);
 679
 680         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 681                 return;
 682
 683         if (MLD_V1_SEEN(mc->idev)) {
 684                 igmp6_join_group(mc);
 685                 return;
 686         }
 687         /* else v2 */
 688
 689         mc->mca_crcount = mc->idev->mc_qrv;
 690         mld_ifc_event(mc->idev);
 691 }
 692
 693 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 694 {
 695         struct net_device *dev = mc->idev->dev;
 696         char buf[MAX_ADDR_LEN];
 697
 698         spin_lock_bh(&mc->mca_lock);
 699         if (mc->mca_flags&MAF_LOADED) {
 700                 mc->mca_flags &= ~MAF_LOADED;
 701                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 702                         dev_mc_del(dev, buf);
 703         }
 704
 705         if (mc->mca_flags & MAF_NOREPORT)
 706                 goto done;
 707         spin_unlock_bh(&mc->mca_lock);
 708
 709         if (!mc->idev->dead)
 710                 igmp6_leave_group(mc);
 711
 712         spin_lock_bh(&mc->mca_lock);
 713         if (del_timer(&mc->mca_timer))
 714                 atomic_dec(&mc->mca_refcnt);
 715 done:
 716         ip6_mc_clear_src(mc);
 717         spin_unlock_bh(&mc->mca_lock);
 718 }
 719
 720 /*
 721  * deleted ifmcaddr6 manipulation
 722  */
 723 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 724 {
 725         struct ifmcaddr6 *pmc;
 726
 727         /* this is an "ifmcaddr6" for convenience; only the fields below
 728          * are actually used. In particular, the refcnt and users are not
 729          * used for management of the delete list. Using the same structure
 730          * for deleted items allows change reports to use common code with
 731          * non-deleted or query-response MCA's.
 732          */
 733         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 734         if (!pmc)
 735                 return;
 736
 737         spin_lock_bh(&im->mca_lock);
 738         spin_lock_init(&pmc->mca_lock);
 739         pmc->idev = im->idev;
 740         in6_dev_hold(idev);
 741         pmc->mca_addr = im->mca_addr;
 742         pmc->mca_crcount = idev->mc_qrv;
 743         pmc->mca_sfmode = im->mca_sfmode;
 744         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 745                 struct ip6_sf_list *psf;
 746
 747                 pmc->mca_tomb = im->mca_tomb;
 748                 pmc->mca_sources = im->mca_sources;
 749                 im->mca_tomb = im->mca_sources = NULL;
 750                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 751                         psf->sf_crcount = pmc->mca_crcount;
 752         }
 753         spin_unlock_bh(&im->mca_lock);
 754
 755         spin_lock_bh(&idev->mc_lock);
 756         pmc->next = idev->mc_tomb;
 757         idev->mc_tomb = pmc;
 758         spin_unlock_bh(&idev->mc_lock);
 759 }
 760
 761 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 762 {
 763         struct ifmcaddr6 *pmc, *pmc_prev;
 764         struct ip6_sf_list *psf, *psf_next;
 765
 766         spin_lock_bh(&idev->mc_lock);
 767         pmc_prev = NULL;
 768         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 769                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 770                         break;
 771                 pmc_prev = pmc;
 772         }
 773         if (pmc) {
 774                 if (pmc_prev)
 775                         pmc_prev->next = pmc->next;
 776                 else
 777                         idev->mc_tomb = pmc->next;
 778         }
 779         spin_unlock_bh(&idev->mc_lock);
 780
 781         if (pmc) {
 782                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 783                         psf_next = psf->sf_next;
 784                         kfree(psf);
 785                 }
 786                 in6_dev_put(pmc->idev);
 787                 kfree(pmc);
 788         }
 789 }
 790
 791 static void mld_clear_delrec(struct inet6_dev *idev)
 792 {
 793         struct ifmcaddr6 *pmc, *nextpmc;
 794
 795         spin_lock_bh(&idev->mc_lock);
 796         pmc = idev->mc_tomb;
 797         idev->mc_tomb = NULL;
 798         spin_unlock_bh(&idev->mc_lock);
 799
 800         for (; pmc; pmc = nextpmc) {
 801                 nextpmc = pmc->next;
 802                 ip6_mc_clear_src(pmc);
 803                 in6_dev_put(pmc->idev);
 804                 kfree(pmc);
 805         }
 806
 807         /* clear dead sources, too */
 808         read_lock_bh(&idev->lock);
 809         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 810                 struct ip6_sf_list *psf, *psf_next;
 811
 812                 spin_lock_bh(&pmc->mca_lock);
 813                 psf = pmc->mca_tomb;
 814                 pmc->mca_tomb = NULL;
 815                 spin_unlock_bh(&pmc->mca_lock);
 816                 for (; psf; psf=psf_next) {
 817                         psf_next = psf->sf_next;
 818                         kfree(psf);
 819                 }
 820         }
 821         read_unlock_bh(&idev->lock);
 822 }
 823
 824
 825 /*
 826  *      device multicast group inc (add if not found)
 827  */
 828 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 829 {
 830         struct ifmcaddr6 *mc;
 831         struct inet6_dev *idev;
 832
 833         /* we need to take a reference on idev */
 834         idev = in6_dev_get(dev);
 835
 836         if (idev == NULL)
 837                 return -EINVAL;
 838
 839         write_lock_bh(&idev->lock);
 840         if (idev->dead) {
 841                 write_unlock_bh(&idev->lock);
 842                 in6_dev_put(idev);
 843                 return -ENODEV;
 844         }
 845
 846         for (mc = idev->mc_list; mc; mc = mc->next) {
 847                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 848                         mc->mca_users++;
 849                         write_unlock_bh(&idev->lock);
 850                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 851                                 NULL, 0);
 852                         in6_dev_put(idev);
 853                         return 0;
 854                 }
 855         }
 856
 857         /*
 858          *      not found: create a new one.
 859          */
 860
 861         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 862
 863         if (mc == NULL) {
 864                 write_unlock_bh(&idev->lock);
 865                 in6_dev_put(idev);
 866                 return -ENOMEM;
 867         }
 868
 869         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 870
 871         ipv6_addr_copy(&mc->mca_addr, addr);
 872         mc->idev = idev; /* (reference taken) */
 873         mc->mca_users = 1;
 874         /* mca_stamp should be updated upon changes */
 875         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 876         atomic_set(&mc->mca_refcnt, 2);
 877         spin_lock_init(&mc->mca_lock);
 878
 879         /* initial mode is (EX, empty) */
 880         mc->mca_sfmode = MCAST_EXCLUDE;
 881         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 882
 883         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 884             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 885                 mc->mca_flags |= MAF_NOREPORT;
 886
 887         mc->next = idev->mc_list;
 888         idev->mc_list = mc;
 889         write_unlock_bh(&idev->lock);
 890
 891         mld_del_delrec(idev, &mc->mca_addr);
 892         igmp6_group_added(mc);
 893         ma_put(mc);
 894         return 0;
 895 }
 896
 897 /*
 898  *      device multicast group del
 899  */
 900 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 901 {
 902         struct ifmcaddr6 *ma, **map;
 903
 904         write_lock_bh(&idev->lock);
 905         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 906                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 907                         if (--ma->mca_users == 0) {
 908                                 *map = ma->next;
 909                                 write_unlock_bh(&idev->lock);
 910
 911                                 igmp6_group_dropped(ma);
 912
 913                                 ma_put(ma);
 914                                 return 0;
 915                         }
 916                         write_unlock_bh(&idev->lock);
 917                         return 0;
 918                 }
 919         }
 920         write_unlock_bh(&idev->lock);
 921
 922         return -ENOENT;
 923 }
 924
 925 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 926 {
 927         struct inet6_dev *idev;
 928         int err;
 929
 930         rcu_read_lock();
 931
 932         idev = __in6_dev_get(dev);
 933         if (!idev)
 934                 err = -ENODEV;
 935         else
 936                 err = __ipv6_dev_mc_dec(idev, addr);
 937
 938         rcu_read_unlock();
 939         return err;
 940 }
 941
 942 /*
 943  * identify MLD packets for MLD filter exceptions
 944  */
 945 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 946 {
 947         struct icmp6hdr *pic;
 948
 949         if (nexthdr != IPPROTO_ICMPV6)
 950                 return 0;
 951
 952         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 953                 return 0;
 954
 955         pic = icmp6_hdr(skb);
 956
 957         switch (pic->icmp6_type) {
 958         case ICMPV6_MGM_QUERY:
 959         case ICMPV6_MGM_REPORT:
 960         case ICMPV6_MGM_REDUCTION:
 961         case ICMPV6_MLD2_REPORT:
 962                 return 1;
 963         default:
 964                 break;
 965         }
 966         return 0;
 967 }
 968
 969 /*
 970  *      check if the interface/address pair is valid
 971  */
 972 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 973                         const struct in6_addr *src_addr)
 974 {
 975         struct inet6_dev *idev;
 976         struct ifmcaddr6 *mc;
 977         int rv = 0;
 978
 979         rcu_read_lock();
 980         idev = __in6_dev_get(dev);
 981         if (idev) {
 982                 read_lock_bh(&idev->lock);
 983                 for (mc = idev->mc_list; mc; mc=mc->next) {
 984                         if (ipv6_addr_equal(&mc->mca_addr, group))
 985                                 break;
 986                 }
 987                 if (mc) {
 988                         if (src_addr && !ipv6_addr_any(src_addr)) {
 989                                 struct ip6_sf_list *psf;
 990
 991                                 spin_lock_bh(&mc->mca_lock);
 992                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 993                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 994                                                 break;
 995                                 }
 996                                 if (psf)
 997                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 998                                                 psf->sf_count[MCAST_EXCLUDE] !=
 999                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1000                                 else
1001                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1002                                 spin_unlock_bh(&mc->mca_lock);
1003                         } else
1004                                 rv = 1; /* don't filter unspecified source */
1005                 }
1006                 read_unlock_bh(&idev->lock);
1007         }
1008         rcu_read_unlock();
1009         return rv;
1010 }
1011
1012 static void mld_gq_start_timer(struct inet6_dev *idev)
1013 {
1014         int tv = net_random() % idev->mc_maxdelay;
1015
1016         idev->mc_gq_running = 1;
1017         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1018                 in6_dev_hold(idev);
1019 }
1020
1021 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1022 {
1023         int tv = net_random() % delay;
1024
1025         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1026                 in6_dev_hold(idev);
1027 }
1028
1029 /*
1030  *      IGMP handling (alias multicast ICMPv6 messages)
1031  */
1032
1033 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1034 {
1035         unsigned long delay = resptime;
1036
1037         /* Do not start timer for these addresses */
1038         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1039             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1040                 return;
1041
1042         if (del_timer(&ma->mca_timer)) {
1043                 atomic_dec(&ma->mca_refcnt);
1044                 delay = ma->mca_timer.expires - jiffies;
1045         }
1046
1047         if (delay >= resptime) {
1048                 if (resptime)
1049                         delay = net_random() % resptime;
1050                 else
1051                         delay = 1;
1052         }
1053         ma->mca_timer.expires = jiffies + delay;
1054         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1055                 atomic_inc(&ma->mca_refcnt);
1056         ma->mca_flags |= MAF_TIMER_RUNNING;
1057 }
1058
1059 /* mark EXCLUDE-mode sources */
1060 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1061         struct in6_addr *srcs)
1062 {
1063         struct ip6_sf_list *psf;
1064         int i, scount;
1065
1066         scount = 0;
1067         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1068                 if (scount == nsrcs)
1069                         break;
1070                 for (i=0; i<nsrcs; i++) {
1071                         /* skip inactive filters */
1072                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1073                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1074                             psf->sf_count[MCAST_EXCLUDE])
1075                                 continue;
1076                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1077                                 scount++;
1078                                 break;
1079                         }
1080                 }
1081         }
1082         pmc->mca_flags &= ~MAF_GSQUERY;
1083         if (scount == nsrcs)    /* all sources excluded */
1084                 return 0;
1085         return 1;
1086 }
1087
1088 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1089         struct in6_addr *srcs)
1090 {
1091         struct ip6_sf_list *psf;
1092         int i, scount;
1093
1094         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1095                 return mld_xmarksources(pmc, nsrcs, srcs);
1096
1097         /* mark INCLUDE-mode sources */
1098
1099         scount = 0;
1100         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1101                 if (scount == nsrcs)
1102                         break;
1103                 for (i=0; i<nsrcs; i++) {
1104                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1105                                 psf->sf_gsresp = 1;
1106                                 scount++;
1107                                 break;
1108                         }
1109                 }
1110         }
1111         if (!scount) {
1112                 pmc->mca_flags &= ~MAF_GSQUERY;
1113                 return 0;
1114         }
1115         pmc->mca_flags |= MAF_GSQUERY;
1116         return 1;
1117 }
1118
1119 /* called with rcu_read_lock() */
1120 int igmp6_event_query(struct sk_buff *skb)
1121 {
1122         struct mld2_query *mlh2 = NULL;
1123         struct ifmcaddr6 *ma;
1124         struct in6_addr *group;
1125         unsigned long max_delay;
1126         struct inet6_dev *idev;
1127         struct mld_msg *mld;
1128         int group_type;
1129         int mark = 0;
1130         int len;
1131
1132         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1133                 return -EINVAL;
1134
1135         /* compute payload length excluding extension headers */
1136         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1137         len -= skb_network_header_len(skb);
1138
1139         /* Drop queries with not link local source */
1140         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1141                 return -EINVAL;
1142
1143         idev = __in6_dev_get(skb->dev);
1144
1145         if (idev == NULL)
1146                 return 0;
1147
1148         mld = (struct mld_msg *)icmp6_hdr(skb);
1149         group = &mld->mld_mca;
1150         group_type = ipv6_addr_type(group);
1151
1152         if (group_type != IPV6_ADDR_ANY &&
1153             !(group_type&IPV6_ADDR_MULTICAST))
1154                 return -EINVAL;
1155
1156         if (len == 24) {
1157                 int switchback;
1158                 /* MLDv1 router present */
1159
1160                 /* Translate milliseconds to jiffies */
1161                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1162
1163                 switchback = (idev->mc_qrv + 1) * max_delay;
1164                 idev->mc_v1_seen = jiffies + switchback;
1165
1166                 /* cancel the interface change timer */
1167                 idev->mc_ifc_count = 0;
1168                 if (del_timer(&idev->mc_ifc_timer))
1169                         __in6_dev_put(idev);
1170                 /* clear deleted report items */
1171                 mld_clear_delrec(idev);
1172         } else if (len >= 28) {
1173                 int srcs_offset = sizeof(struct mld2_query) -
1174                                   sizeof(struct icmp6hdr);
1175                 if (!pskb_may_pull(skb, srcs_offset))
1176                         return -EINVAL;
1177
1178                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1179                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1180                 if (!max_delay)
1181                         max_delay = 1;
1182                 idev->mc_maxdelay = max_delay;
1183                 if (mlh2->mld2q_qrv)
1184                         idev->mc_qrv = mlh2->mld2q_qrv;
1185                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1186                         if (mlh2->mld2q_nsrcs)
1187                                 return -EINVAL; /* no sources allowed */
1188
1189                         mld_gq_start_timer(idev);
1190                         return 0;
1191                 }
1192                 /* mark sources to include, if group & source-specific */
1193                 if (mlh2->mld2q_nsrcs != 0) {
1194                         if (!pskb_may_pull(skb, srcs_offset +
1195                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1196                                 return -EINVAL;
1197
1198                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1199                         mark = 1;
1200                 }
1201         } else
1202                 return -EINVAL;
1203
1204         read_lock_bh(&idev->lock);
1205         if (group_type == IPV6_ADDR_ANY) {
1206                 for (ma = idev->mc_list; ma; ma=ma->next) {
1207                         spin_lock_bh(&ma->mca_lock);
1208                         igmp6_group_queried(ma, max_delay);
1209                         spin_unlock_bh(&ma->mca_lock);
1210                 }
1211         } else {
1212                 for (ma = idev->mc_list; ma; ma=ma->next) {
1213                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1214                                 continue;
1215                         spin_lock_bh(&ma->mca_lock);
1216                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1217                                 /* gsquery <- gsquery && mark */
1218                                 if (!mark)
1219                                         ma->mca_flags &= ~MAF_GSQUERY;
1220                         } else {
1221                                 /* gsquery <- mark */
1222                                 if (mark)
1223                                         ma->mca_flags |= MAF_GSQUERY;
1224                                 else
1225                                         ma->mca_flags &= ~MAF_GSQUERY;
1226                         }
1227                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1228                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1229                                 igmp6_group_queried(ma, max_delay);
1230                         spin_unlock_bh(&ma->mca_lock);
1231                         break;
1232                 }
1233         }
1234         read_unlock_bh(&idev->lock);
1235
1236         return 0;
1237 }
1238
1239 /* called with rcu_read_lock() */
1240 int igmp6_event_report(struct sk_buff *skb)
1241 {
1242         struct ifmcaddr6 *ma;
1243         struct inet6_dev *idev;
1244         struct mld_msg *mld;
1245         int addr_type;
1246
1247         /* Our own report looped back. Ignore it. */
1248         if (skb->pkt_type == PACKET_LOOPBACK)
1249                 return 0;
1250
1251         /* send our report if the MC router may not have heard this report */
1252         if (skb->pkt_type != PACKET_MULTICAST &&
1253             skb->pkt_type != PACKET_BROADCAST)
1254                 return 0;
1255
1256         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1257                 return -EINVAL;
1258
1259         mld = (struct mld_msg *)icmp6_hdr(skb);
1260
1261         /* Drop reports with not link local source */
1262         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1263         if (addr_type != IPV6_ADDR_ANY &&
1264             !(addr_type&IPV6_ADDR_LINKLOCAL))
1265                 return -EINVAL;
1266
1267         idev = __in6_dev_get(skb->dev);
1268         if (idev == NULL)
1269                 return -ENODEV;
1270
1271         /*
1272          *      Cancel the timer for this group
1273          */
1274
1275         read_lock_bh(&idev->lock);
1276         for (ma = idev->mc_list; ma; ma=ma->next) {
1277                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1278                         spin_lock(&ma->mca_lock);
1279                         if (del_timer(&ma->mca_timer))
1280                                 atomic_dec(&ma->mca_refcnt);
1281                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1282                         spin_unlock(&ma->mca_lock);
1283                         break;
1284                 }
1285         }
1286         read_unlock_bh(&idev->lock);
1287         return 0;
1288 }
1289
1290 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1291         int gdeleted, int sdeleted)
1292 {
1293         switch (type) {
1294         case MLD2_MODE_IS_INCLUDE:
1295         case MLD2_MODE_IS_EXCLUDE:
1296                 if (gdeleted || sdeleted)
1297                         return 0;
1298                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1299                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1300                                 return 1;
1301                         /* don't include if this source is excluded
1302                          * in all filters
1303                          */
1304                         if (psf->sf_count[MCAST_INCLUDE])
1305                                 return type == MLD2_MODE_IS_INCLUDE;
1306                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1307                                 psf->sf_count[MCAST_EXCLUDE];
1308                 }
1309                 return 0;
1310         case MLD2_CHANGE_TO_INCLUDE:
1311                 if (gdeleted || sdeleted)
1312                         return 0;
1313                 return psf->sf_count[MCAST_INCLUDE] != 0;
1314         case MLD2_CHANGE_TO_EXCLUDE:
1315                 if (gdeleted || sdeleted)
1316                         return 0;
1317                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1318                     psf->sf_count[MCAST_INCLUDE])
1319                         return 0;
1320                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1321                         psf->sf_count[MCAST_EXCLUDE];
1322         case MLD2_ALLOW_NEW_SOURCES:
1323                 if (gdeleted || !psf->sf_crcount)
1324                         return 0;
1325                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1326         case MLD2_BLOCK_OLD_SOURCES:
1327                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1328                         return gdeleted || (psf->sf_crcount && sdeleted);
1329                 return psf->sf_crcount && !gdeleted && !sdeleted;
1330         }
1331         return 0;
1332 }
1333
1334 static int
1335 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1336 {
1337         struct ip6_sf_list *psf;
1338         int scount = 0;
1339
1340         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1341                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1342                         continue;
1343                 scount++;
1344         }
1345         return scount;
1346 }
1347
1348 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1349 {
1350         struct net *net = dev_net(dev);
1351         struct sock *sk = net->ipv6.igmp_sk;
1352         struct sk_buff *skb;
1353         struct mld2_report *pmr;
1354         struct in6_addr addr_buf;
1355         const struct in6_addr *saddr;
1356         int err;
1357         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1358                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1359                      IPV6_TLV_PADN, 0 };
1360
1361         /* we assume size > sizeof(ra) here */
1362         size += LL_ALLOCATED_SPACE(dev);
1363         /* limit our allocations to order-0 page */
1364         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1365         skb = sock_alloc_send_skb(sk, size, 1, &err);
1366
1367         if (!skb)
1368                 return NULL;
1369
1370         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1371
1372         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1373                 /* <draft-ietf-magma-mld-source-05.txt>:
1374                  * use unspecified address as the source address
1375                  * when a valid link-local address is not available.
1376                  */
1377                 saddr = &in6addr_any;
1378         } else
1379                 saddr = &addr_buf;
1380
1381         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1382
1383         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1384
1385         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1386         skb_put(skb, sizeof(*pmr));
1387         pmr = (struct mld2_report *)skb_transport_header(skb);
1388         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1389         pmr->mld2r_resv1 = 0;
1390         pmr->mld2r_cksum = 0;
1391         pmr->mld2r_resv2 = 0;
1392         pmr->mld2r_ngrec = 0;
1393         return skb;
1394 }
1395
1396 static void mld_sendpack(struct sk_buff *skb)
1397 {
1398         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1399         struct mld2_report *pmr =
1400                               (struct mld2_report *)skb_transport_header(skb);
1401         int payload_len, mldlen;
1402         struct inet6_dev *idev;
1403         struct net *net = dev_net(skb->dev);
1404         int err;
1405         struct flowi fl;
1406         struct dst_entry *dst;
1407
1408         rcu_read_lock();
1409         idev = __in6_dev_get(skb->dev);
1410         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1411
1412         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1413         mldlen = skb->tail - skb->transport_header;
1414         pip6->payload_len = htons(payload_len);
1415
1416         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1417                                            IPPROTO_ICMPV6,
1418                                            csum_partial(skb_transport_header(skb),
1419                                                         mldlen, 0));
1420
1421         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1422
1423         if (!dst) {
1424                 err = -ENOMEM;
1425                 goto err_out;
1426         }
1427
1428         icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1429                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1430                          skb->dev->ifindex);
1431
1432         err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1433         skb_dst_set(skb, dst);
1434         if (err)
1435                 goto err_out;
1436
1437         payload_len = skb->len;
1438
1439         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1440                       dst_output);
1441 out:
1442         if (!err) {
1443                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1444                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1445                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1446         } else
1447                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1448
1449         rcu_read_unlock();
1450         return;
1451
1452 err_out:
1453         kfree_skb(skb);
1454         goto out;
1455 }
1456
1457 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1458 {
1459         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1460 }
1461
1462 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1463         int type, struct mld2_grec **ppgr)
1464 {
1465         struct net_device *dev = pmc->idev->dev;
1466         struct mld2_report *pmr;
1467         struct mld2_grec *pgr;
1468
1469         if (!skb)
1470                 skb = mld_newpack(dev, dev->mtu);
1471         if (!skb)
1472                 return NULL;
1473         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1474         pgr->grec_type = type;
1475         pgr->grec_auxwords = 0;
1476         pgr->grec_nsrcs = 0;
1477         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1478         pmr = (struct mld2_report *)skb_transport_header(skb);
1479         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1480         *ppgr = pgr;
1481         return skb;
1482 }
1483
1484 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1485         skb_tailroom(skb)) : 0)
1486
1487 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1488         int type, int gdeleted, int sdeleted)
1489 {
1490         struct net_device *dev = pmc->idev->dev;
1491         struct mld2_report *pmr;
1492         struct mld2_grec *pgr = NULL;
1493         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1494         int scount, stotal, first, isquery, truncate;
1495
1496         if (pmc->mca_flags & MAF_NOREPORT)
1497                 return skb;
1498
1499         isquery = type == MLD2_MODE_IS_INCLUDE ||
1500                   type == MLD2_MODE_IS_EXCLUDE;
1501         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1502                     type == MLD2_CHANGE_TO_EXCLUDE;
1503
1504         stotal = scount = 0;
1505
1506         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1507
1508         if (!*psf_list)
1509                 goto empty_source;
1510
1511         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1512
1513         /* EX and TO_EX get a fresh packet, if needed */
1514         if (truncate) {
1515                 if (pmr && pmr->mld2r_ngrec &&
1516                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1517                         if (skb)
1518                                 mld_sendpack(skb);
1519                         skb = mld_newpack(dev, dev->mtu);
1520                 }
1521         }
1522         first = 1;
1523         psf_prev = NULL;
1524         for (psf=*psf_list; psf; psf=psf_next) {
1525                 struct in6_addr *psrc;
1526
1527                 psf_next = psf->sf_next;
1528
1529                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1530                         psf_prev = psf;
1531                         continue;
1532                 }
1533
1534                 /* clear marks on query responses */
1535                 if (isquery)
1536                         psf->sf_gsresp = 0;
1537
1538                 if (AVAILABLE(skb) < sizeof(*psrc) +
1539                     first*sizeof(struct mld2_grec)) {
1540                         if (truncate && !first)
1541                                 break;   /* truncate these */
1542                         if (pgr)
1543                                 pgr->grec_nsrcs = htons(scount);
1544                         if (skb)
1545                                 mld_sendpack(skb);
1546                         skb = mld_newpack(dev, dev->mtu);
1547                         first = 1;
1548                         scount = 0;
1549                 }
1550                 if (first) {
1551                         skb = add_grhead(skb, pmc, type, &pgr);
1552                         first = 0;
1553                 }
1554                 if (!skb)
1555                         return NULL;
1556                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1557                 *psrc = psf->sf_addr;
1558                 scount++; stotal++;
1559                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1560                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1561                         psf->sf_crcount--;
1562                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1563                                 if (psf_prev)
1564                                         psf_prev->sf_next = psf->sf_next;
1565                                 else
1566                                         *psf_list = psf->sf_next;
1567                                 kfree(psf);
1568                                 continue;
1569                         }
1570                 }
1571                 psf_prev = psf;
1572         }
1573
1574 empty_source:
1575         if (!stotal) {
1576                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1577                     type == MLD2_BLOCK_OLD_SOURCES)
1578                         return skb;
1579                 if (pmc->mca_crcount || isquery) {
1580                         /* make sure we have room for group header */
1581                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1582                                 mld_sendpack(skb);
1583                                 skb = NULL; /* add_grhead will get a new one */
1584                         }
1585                         skb = add_grhead(skb, pmc, type, &pgr);
1586                 }
1587         }
1588         if (pgr)
1589                 pgr->grec_nsrcs = htons(scount);
1590
1591         if (isquery)
1592                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1593         return skb;
1594 }
1595
1596 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1597 {
1598         struct sk_buff *skb = NULL;
1599         int type;
1600
1601         if (!pmc) {
1602                 read_lock_bh(&idev->lock);
1603                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1604                         if (pmc->mca_flags & MAF_NOREPORT)
1605                                 continue;
1606                         spin_lock_bh(&pmc->mca_lock);
1607                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1608                                 type = MLD2_MODE_IS_EXCLUDE;
1609                         else
1610                                 type = MLD2_MODE_IS_INCLUDE;
1611                         skb = add_grec(skb, pmc, type, 0, 0);
1612                         spin_unlock_bh(&pmc->mca_lock);
1613                 }
1614                 read_unlock_bh(&idev->lock);
1615         } else {
1616                 spin_lock_bh(&pmc->mca_lock);
1617                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1618                         type = MLD2_MODE_IS_EXCLUDE;
1619                 else
1620                         type = MLD2_MODE_IS_INCLUDE;
1621                 skb = add_grec(skb, pmc, type, 0, 0);
1622                 spin_unlock_bh(&pmc->mca_lock);
1623         }
1624         if (skb)
1625                 mld_sendpack(skb);
1626 }
1627
1628 /*
1629  * remove zero-count source records from a source filter list
1630  */
1631 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1632 {
1633         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1634
1635         psf_prev = NULL;
1636         for (psf=*ppsf; psf; psf = psf_next) {
1637                 psf_next = psf->sf_next;
1638                 if (psf->sf_crcount == 0) {
1639                         if (psf_prev)
1640                                 psf_prev->sf_next = psf->sf_next;
1641                         else
1642                                 *ppsf = psf->sf_next;
1643                         kfree(psf);
1644                 } else
1645                         psf_prev = psf;
1646         }
1647 }
1648
1649 static void mld_send_cr(struct inet6_dev *idev)
1650 {
1651         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1652         struct sk_buff *skb = NULL;
1653         int type, dtype;
1654
1655         read_lock_bh(&idev->lock);
1656         spin_lock(&idev->mc_lock);
1657
1658         /* deleted MCA's */
1659         pmc_prev = NULL;
1660         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1661                 pmc_next = pmc->next;
1662                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1663                         type = MLD2_BLOCK_OLD_SOURCES;
1664                         dtype = MLD2_BLOCK_OLD_SOURCES;
1665                         skb = add_grec(skb, pmc, type, 1, 0);
1666                         skb = add_grec(skb, pmc, dtype, 1, 1);
1667                 }
1668                 if (pmc->mca_crcount) {
1669                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1670                                 type = MLD2_CHANGE_TO_INCLUDE;
1671                                 skb = add_grec(skb, pmc, type, 1, 0);
1672                         }
1673                         pmc->mca_crcount--;
1674                         if (pmc->mca_crcount == 0) {
1675                                 mld_clear_zeros(&pmc->mca_tomb);
1676                                 mld_clear_zeros(&pmc->mca_sources);
1677                         }
1678                 }
1679                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1680                     !pmc->mca_sources) {
1681                         if (pmc_prev)
1682                                 pmc_prev->next = pmc_next;
1683                         else
1684                                 idev->mc_tomb = pmc_next;
1685                         in6_dev_put(pmc->idev);
1686                         kfree(pmc);
1687                 } else
1688                         pmc_prev = pmc;
1689         }
1690         spin_unlock(&idev->mc_lock);
1691
1692         /* change recs */
1693         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1694                 spin_lock_bh(&pmc->mca_lock);
1695                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1696                         type = MLD2_BLOCK_OLD_SOURCES;
1697                         dtype = MLD2_ALLOW_NEW_SOURCES;
1698                 } else {
1699                         type = MLD2_ALLOW_NEW_SOURCES;
1700                         dtype = MLD2_BLOCK_OLD_SOURCES;
1701                 }
1702                 skb = add_grec(skb, pmc, type, 0, 0);
1703                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1704
1705                 /* filter mode changes */
1706                 if (pmc->mca_crcount) {
1707                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1708                                 type = MLD2_CHANGE_TO_EXCLUDE;
1709                         else
1710                                 type = MLD2_CHANGE_TO_INCLUDE;
1711                         skb = add_grec(skb, pmc, type, 0, 0);
1712                         pmc->mca_crcount--;
1713                 }
1714                 spin_unlock_bh(&pmc->mca_lock);
1715         }
1716         read_unlock_bh(&idev->lock);
1717         if (!skb)
1718                 return;
1719         (void) mld_sendpack(skb);
1720 }
1721
1722 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1723 {
1724         struct net *net = dev_net(dev);
1725         struct sock *sk = net->ipv6.igmp_sk;
1726         struct inet6_dev *idev;
1727         struct sk_buff *skb;
1728         struct mld_msg *hdr;
1729         const struct in6_addr *snd_addr, *saddr;
1730         struct in6_addr addr_buf;
1731         int err, len, payload_len, full_len;
1732         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1733                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1734                      IPV6_TLV_PADN, 0 };
1735         struct flowi fl;
1736         struct dst_entry *dst;
1737
1738         if (type == ICMPV6_MGM_REDUCTION)
1739                 snd_addr = &in6addr_linklocal_allrouters;
1740         else
1741                 snd_addr = addr;
1742
1743         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1744         payload_len = len + sizeof(ra);
1745         full_len = sizeof(struct ipv6hdr) + payload_len;
1746
1747         rcu_read_lock();
1748         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1749                       IPSTATS_MIB_OUT, full_len);
1750         rcu_read_unlock();
1751
1752         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1753
1754         if (skb == NULL) {
1755                 rcu_read_lock();
1756                 IP6_INC_STATS(net, __in6_dev_get(dev),
1757                               IPSTATS_MIB_OUTDISCARDS);
1758                 rcu_read_unlock();
1759                 return;
1760         }
1761
1762         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1763
1764         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1765                 /* <draft-ietf-magma-mld-source-05.txt>:
1766                  * use unspecified address as the source address
1767                  * when a valid link-local address is not available.
1768                  */
1769                 saddr = &in6addr_any;
1770         } else
1771                 saddr = &addr_buf;
1772
1773         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1774
1775         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1776
1777         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1778         memset(hdr, 0, sizeof(struct mld_msg));
1779         hdr->mld_type = type;
1780         ipv6_addr_copy(&hdr->mld_mca, addr);
1781
1782         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1783                                          IPPROTO_ICMPV6,
1784                                          csum_partial(hdr, len, 0));
1785
1786         rcu_read_lock();
1787         idev = __in6_dev_get(skb->dev);
1788
1789         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1790         if (!dst) {
1791                 err = -ENOMEM;
1792                 goto err_out;
1793         }
1794
1795         icmpv6_flow_init(sk, &fl, type,
1796                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1797                          skb->dev->ifindex);
1798
1799         err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1800         if (err)
1801                 goto err_out;
1802
1803         skb_dst_set(skb, dst);
1804         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1805                       dst_output);
1806 out:
1807         if (!err) {
1808                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1809                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1810                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1811         } else
1812                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1813
1814         rcu_read_unlock();
1815         return;
1816
1817 err_out:
1818         kfree_skb(skb);
1819         goto out;
1820 }
1821
1822 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1823         struct in6_addr *psfsrc)
1824 {
1825         struct ip6_sf_list *psf, *psf_prev;
1826         int rv = 0;
1827
1828         psf_prev = NULL;
1829         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1830                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1831                         break;
1832                 psf_prev = psf;
1833         }
1834         if (!psf || psf->sf_count[sfmode] == 0) {
1835                 /* source filter not found, or count wrong =>  bug */
1836                 return -ESRCH;
1837         }
1838         psf->sf_count[sfmode]--;
1839         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1840                 struct inet6_dev *idev = pmc->idev;
1841
1842                 /* no more filters for this source */
1843                 if (psf_prev)
1844                         psf_prev->sf_next = psf->sf_next;
1845                 else
1846                         pmc->mca_sources = psf->sf_next;
1847                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1848                     !MLD_V1_SEEN(idev)) {
1849                         psf->sf_crcount = idev->mc_qrv;
1850                         psf->sf_next = pmc->mca_tomb;
1851                         pmc->mca_tomb = psf;
1852                         rv = 1;
1853                 } else
1854                         kfree(psf);
1855         }
1856         return rv;
1857 }
1858
1859 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1860                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1861                           int delta)
1862 {
1863         struct ifmcaddr6 *pmc;
1864         int     changerec = 0;
1865         int     i, err;
1866
1867         if (!idev)
1868                 return -ENODEV;
1869         read_lock_bh(&idev->lock);
1870         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1871                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1872                         break;
1873         }
1874         if (!pmc) {
1875                 /* MCA not found?? bug */
1876                 read_unlock_bh(&idev->lock);
1877                 return -ESRCH;
1878         }
1879         spin_lock_bh(&pmc->mca_lock);
1880         sf_markstate(pmc);
1881         if (!delta) {
1882                 if (!pmc->mca_sfcount[sfmode]) {
1883                         spin_unlock_bh(&pmc->mca_lock);
1884                         read_unlock_bh(&idev->lock);
1885                         return -EINVAL;
1886                 }
1887                 pmc->mca_sfcount[sfmode]--;
1888         }
1889         err = 0;
1890         for (i=0; i<sfcount; i++) {
1891                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1892
1893                 changerec |= rv > 0;
1894                 if (!err && rv < 0)
1895                         err = rv;
1896         }
1897         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1898             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1899             pmc->mca_sfcount[MCAST_INCLUDE]) {
1900                 struct ip6_sf_list *psf;
1901
1902                 /* filter mode change */
1903                 pmc->mca_sfmode = MCAST_INCLUDE;
1904                 pmc->mca_crcount = idev->mc_qrv;
1905                 idev->mc_ifc_count = pmc->mca_crcount;
1906                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1907                         psf->sf_crcount = 0;
1908                 mld_ifc_event(pmc->idev);
1909         } else if (sf_setstate(pmc) || changerec)
1910                 mld_ifc_event(pmc->idev);
1911         spin_unlock_bh(&pmc->mca_lock);
1912         read_unlock_bh(&idev->lock);
1913         return err;
1914 }
1915
1916 /*
1917  * Add multicast single-source filter to the interface list
1918  */
1919 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1920         struct in6_addr *psfsrc, int delta)
1921 {
1922         struct ip6_sf_list *psf, *psf_prev;
1923
1924         psf_prev = NULL;
1925         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1926                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1927                         break;
1928                 psf_prev = psf;
1929         }
1930         if (!psf) {
1931                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1932                 if (!psf)
1933                         return -ENOBUFS;
1934
1935                 psf->sf_addr = *psfsrc;
1936                 if (psf_prev) {
1937                         psf_prev->sf_next = psf;
1938                 } else
1939                         pmc->mca_sources = psf;
1940         }
1941         psf->sf_count[sfmode]++;
1942         return 0;
1943 }
1944
1945 static void sf_markstate(struct ifmcaddr6 *pmc)
1946 {
1947         struct ip6_sf_list *psf;
1948         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1949
1950         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1951                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1952                         psf->sf_oldin = mca_xcount ==
1953                                 psf->sf_count[MCAST_EXCLUDE] &&
1954                                 !psf->sf_count[MCAST_INCLUDE];
1955                 } else
1956                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1957 }
1958
1959 static int sf_setstate(struct ifmcaddr6 *pmc)
1960 {
1961         struct ip6_sf_list *psf, *dpsf;
1962         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1963         int qrv = pmc->idev->mc_qrv;
1964         int new_in, rv;
1965
1966         rv = 0;
1967         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1968                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1969                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1970                                 !psf->sf_count[MCAST_INCLUDE];
1971                 } else
1972                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1973                 if (new_in) {
1974                         if (!psf->sf_oldin) {
1975                                 struct ip6_sf_list *prev = NULL;
1976
1977                                 for (dpsf=pmc->mca_tomb; dpsf;
1978                                      dpsf=dpsf->sf_next) {
1979                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1980                                             &psf->sf_addr))
1981                                                 break;
1982                                         prev = dpsf;
1983                                 }
1984                                 if (dpsf) {
1985                                         if (prev)
1986                                                 prev->sf_next = dpsf->sf_next;
1987                                         else
1988                                                 pmc->mca_tomb = dpsf->sf_next;
1989                                         kfree(dpsf);
1990                                 }
1991                                 psf->sf_crcount = qrv;
1992                                 rv++;
1993                         }
1994                 } else if (psf->sf_oldin) {
1995                         psf->sf_crcount = 0;
1996                         /*
1997                          * add or update "delete" records if an active filter
1998                          * is now inactive
1999                          */
2000                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2001                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2002                                     &psf->sf_addr))
2003                                         break;
2004                         if (!dpsf) {
2005                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2006                                 if (!dpsf)
2007                                         continue;
2008                                 *dpsf = *psf;
2009                                 /* pmc->mca_lock held by callers */
2010                                 dpsf->sf_next = pmc->mca_tomb;
2011                                 pmc->mca_tomb = dpsf;
2012                         }
2013                         dpsf->sf_crcount = qrv;
2014                         rv++;
2015                 }
2016         }
2017         return rv;
2018 }
2019
2020 /*
2021  * Add multicast source filter list to the interface list
2022  */
2023 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2024                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2025                           int delta)
2026 {
2027         struct ifmcaddr6 *pmc;
2028         int     isexclude;
2029         int     i, err;
2030
2031         if (!idev)
2032                 return -ENODEV;
2033         read_lock_bh(&idev->lock);
2034         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2035                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2036                         break;
2037         }
2038         if (!pmc) {
2039                 /* MCA not found?? bug */
2040                 read_unlock_bh(&idev->lock);
2041                 return -ESRCH;
2042         }
2043         spin_lock_bh(&pmc->mca_lock);
2044
2045         sf_markstate(pmc);
2046         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2047         if (!delta)
2048                 pmc->mca_sfcount[sfmode]++;
2049         err = 0;
2050         for (i=0; i<sfcount; i++) {
2051                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2052                 if (err)
2053                         break;
2054         }
2055         if (err) {
2056                 int j;
2057
2058                 if (!delta)
2059                         pmc->mca_sfcount[sfmode]--;
2060                 for (j=0; j<i; j++)
2061                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2062         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2063                 struct ip6_sf_list *psf;
2064
2065                 /* filter mode change */
2066                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2067                         pmc->mca_sfmode = MCAST_EXCLUDE;
2068                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2069                         pmc->mca_sfmode = MCAST_INCLUDE;
2070                 /* else no filters; keep old mode for reports */
2071
2072                 pmc->mca_crcount = idev->mc_qrv;
2073                 idev->mc_ifc_count = pmc->mca_crcount;
2074                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2075                         psf->sf_crcount = 0;
2076                 mld_ifc_event(idev);
2077         } else if (sf_setstate(pmc))
2078                 mld_ifc_event(idev);
2079         spin_unlock_bh(&pmc->mca_lock);
2080         read_unlock_bh(&idev->lock);
2081         return err;
2082 }
2083
2084 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2085 {
2086         struct ip6_sf_list *psf, *nextpsf;
2087
2088         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2089                 nextpsf = psf->sf_next;
2090                 kfree(psf);
2091         }
2092         pmc->mca_tomb = NULL;
2093         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2094                 nextpsf = psf->sf_next;
2095                 kfree(psf);
2096         }
2097         pmc->mca_sources = NULL;
2098         pmc->mca_sfmode = MCAST_EXCLUDE;
2099         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2100         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2101 }
2102
2103
2104 static void igmp6_join_group(struct ifmcaddr6 *ma)
2105 {
2106         unsigned long delay;
2107
2108         if (ma->mca_flags & MAF_NOREPORT)
2109                 return;
2110
2111         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2112
2113         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2114
2115         spin_lock_bh(&ma->mca_lock);
2116         if (del_timer(&ma->mca_timer)) {
2117                 atomic_dec(&ma->mca_refcnt);
2118                 delay = ma->mca_timer.expires - jiffies;
2119         }
2120
2121         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2122                 atomic_inc(&ma->mca_refcnt);
2123         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2124         spin_unlock_bh(&ma->mca_lock);
2125 }
2126
2127 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2128                             struct inet6_dev *idev)
2129 {
2130         int err;
2131
2132         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2133          * so no other readers or writers of iml or its sflist
2134          */
2135         if (!iml->sflist) {
2136                 /* any-source empty exclude case */
2137                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2138         }
2139         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2140                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2141         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2142         iml->sflist = NULL;
2143         return err;
2144 }
2145
2146 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2147 {
2148         if (MLD_V1_SEEN(ma->idev)) {
2149                 if (ma->mca_flags & MAF_LAST_REPORTER)
2150                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2151                                 ICMPV6_MGM_REDUCTION);
2152         } else {
2153                 mld_add_delrec(ma->idev, ma);
2154                 mld_ifc_event(ma->idev);
2155         }
2156 }
2157
2158 static void mld_gq_timer_expire(unsigned long data)
2159 {
2160         struct inet6_dev *idev = (struct inet6_dev *)data;
2161
2162         idev->mc_gq_running = 0;
2163         mld_send_report(idev, NULL);
2164         __in6_dev_put(idev);
2165 }
2166
2167 static void mld_ifc_timer_expire(unsigned long data)
2168 {
2169         struct inet6_dev *idev = (struct inet6_dev *)data;
2170
2171         mld_send_cr(idev);
2172         if (idev->mc_ifc_count) {
2173                 idev->mc_ifc_count--;
2174                 if (idev->mc_ifc_count)
2175                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2176         }
2177         __in6_dev_put(idev);
2178 }
2179
2180 static void mld_ifc_event(struct inet6_dev *idev)
2181 {
2182         if (MLD_V1_SEEN(idev))
2183                 return;
2184         idev->mc_ifc_count = idev->mc_qrv;
2185         mld_ifc_start_timer(idev, 1);
2186 }
2187
2188
2189 static void igmp6_timer_handler(unsigned long data)
2190 {
2191         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2192
2193         if (MLD_V1_SEEN(ma->idev))
2194                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2195         else
2196                 mld_send_report(ma->idev, ma);
2197
2198         spin_lock(&ma->mca_lock);
2199         ma->mca_flags |=  MAF_LAST_REPORTER;
2200         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2201         spin_unlock(&ma->mca_lock);
2202         ma_put(ma);
2203 }
2204
2205 /* Device changing type */
2206
2207 void ipv6_mc_unmap(struct inet6_dev *idev)
2208 {
2209         struct ifmcaddr6 *i;
2210
2211         /* Install multicast list, except for all-nodes (already installed) */
2212
2213         read_lock_bh(&idev->lock);
2214         for (i = idev->mc_list; i; i = i->next)
2215                 igmp6_group_dropped(i);
2216         read_unlock_bh(&idev->lock);
2217 }
2218
2219 void ipv6_mc_remap(struct inet6_dev *idev)
2220 {
2221         ipv6_mc_up(idev);
2222 }
2223
2224 /* Device going down */
2225
2226 void ipv6_mc_down(struct inet6_dev *idev)
2227 {
2228         struct ifmcaddr6 *i;
2229
2230         /* Withdraw multicast list */
2231
2232         read_lock_bh(&idev->lock);
2233         idev->mc_ifc_count = 0;
2234         if (del_timer(&idev->mc_ifc_timer))
2235                 __in6_dev_put(idev);
2236         idev->mc_gq_running = 0;
2237         if (del_timer(&idev->mc_gq_timer))
2238                 __in6_dev_put(idev);
2239
2240         for (i = idev->mc_list; i; i=i->next)
2241                 igmp6_group_dropped(i);
2242         read_unlock_bh(&idev->lock);
2243
2244         mld_clear_delrec(idev);
2245 }
2246
2247
2248 /* Device going up */
2249
2250 void ipv6_mc_up(struct inet6_dev *idev)
2251 {
2252         struct ifmcaddr6 *i;
2253
2254         /* Install multicast list, except for all-nodes (already installed) */
2255
2256         read_lock_bh(&idev->lock);
2257         for (i = idev->mc_list; i; i=i->next)
2258                 igmp6_group_added(i);
2259         read_unlock_bh(&idev->lock);
2260 }
2261
2262 /* IPv6 device initialization. */
2263
2264 void ipv6_mc_init_dev(struct inet6_dev *idev)
2265 {
2266         write_lock_bh(&idev->lock);
2267         spin_lock_init(&idev->mc_lock);
2268         idev->mc_gq_running = 0;
2269         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2270                         (unsigned long)idev);
2271         idev->mc_tomb = NULL;
2272         idev->mc_ifc_count = 0;
2273         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2274                         (unsigned long)idev);
2275         idev->mc_qrv = MLD_QRV_DEFAULT;
2276         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2277         idev->mc_v1_seen = 0;
2278         write_unlock_bh(&idev->lock);
2279 }
2280
2281 /*
2282  *      Device is about to be destroyed: clean up.
2283  */
2284
2285 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2286 {
2287         struct ifmcaddr6 *i;
2288
2289         /* Deactivate timers */
2290         ipv6_mc_down(idev);
2291
2292         /* Delete all-nodes address. */
2293         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2294          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2295          * fail.
2296          */
2297         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2298
2299         if (idev->cnf.forwarding)
2300                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2301
2302         write_lock_bh(&idev->lock);
2303         while ((i = idev->mc_list) != NULL) {
2304                 idev->mc_list = i->next;
2305                 write_unlock_bh(&idev->lock);
2306
2307                 igmp6_group_dropped(i);
2308                 ma_put(i);
2309
2310                 write_lock_bh(&idev->lock);
2311         }
2312         write_unlock_bh(&idev->lock);
2313 }
2314
2315 #ifdef CONFIG_PROC_FS
2316 struct igmp6_mc_iter_state {
2317         struct seq_net_private p;
2318         struct net_device *dev;
2319         struct inet6_dev *idev;
2320 };
2321
2322 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2323
2324 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2325 {
2326         struct ifmcaddr6 *im = NULL;
2327         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2328         struct net *net = seq_file_net(seq);
2329
2330         state->idev = NULL;
2331         for_each_netdev_rcu(net, state->dev) {
2332                 struct inet6_dev *idev;
2333                 idev = __in6_dev_get(state->dev);
2334                 if (!idev)
2335                         continue;
2336                 read_lock_bh(&idev->lock);
2337                 im = idev->mc_list;
2338                 if (im) {
2339                         state->idev = idev;
2340                         break;
2341                 }
2342                 read_unlock_bh(&idev->lock);
2343         }
2344         return im;
2345 }
2346
2347 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2348 {
2349         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2350
2351         im = im->next;
2352         while (!im) {
2353                 if (likely(state->idev != NULL))
2354                         read_unlock_bh(&state->idev->lock);
2355
2356                 state->dev = next_net_device_rcu(state->dev);
2357                 if (!state->dev) {
2358                         state->idev = NULL;
2359                         break;
2360                 }
2361                 state->idev = __in6_dev_get(state->dev);
2362                 if (!state->idev)
2363                         continue;
2364                 read_lock_bh(&state->idev->lock);
2365                 im = state->idev->mc_list;
2366         }
2367         return im;
2368 }
2369
2370 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2371 {
2372         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2373         if (im)
2374                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2375                         --pos;
2376         return pos ? NULL : im;
2377 }
2378
2379 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2380         __acquires(RCU)
2381 {
2382         rcu_read_lock();
2383         return igmp6_mc_get_idx(seq, *pos);
2384 }
2385
2386 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2387 {
2388         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2389
2390         ++*pos;
2391         return im;
2392 }
2393
2394 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2395         __releases(RCU)
2396 {
2397         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2398
2399         if (likely(state->idev != NULL)) {
2400                 read_unlock_bh(&state->idev->lock);
2401                 state->idev = NULL;
2402         }
2403         state->dev = NULL;
2404         rcu_read_unlock();
2405 }
2406
2407 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2408 {
2409         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2410         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2411
2412         seq_printf(seq,
2413                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2414                    state->dev->ifindex, state->dev->name,
2415                    &im->mca_addr,
2416                    im->mca_users, im->mca_flags,
2417                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2418                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2419         return 0;
2420 }
2421
2422 static const struct seq_operations igmp6_mc_seq_ops = {
2423         .start  =       igmp6_mc_seq_start,
2424         .next   =       igmp6_mc_seq_next,
2425         .stop   =       igmp6_mc_seq_stop,
2426         .show   =       igmp6_mc_seq_show,
2427 };
2428
2429 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2430 {
2431         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2432                             sizeof(struct igmp6_mc_iter_state));
2433 }
2434
2435 static const struct file_operations igmp6_mc_seq_fops = {
2436         .owner          =       THIS_MODULE,
2437         .open           =       igmp6_mc_seq_open,
2438         .read           =       seq_read,
2439         .llseek         =       seq_lseek,
2440         .release        =       seq_release_net,
2441 };
2442
2443 struct igmp6_mcf_iter_state {
2444         struct seq_net_private p;
2445         struct net_device *dev;
2446         struct inet6_dev *idev;
2447         struct ifmcaddr6 *im;
2448 };
2449
2450 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2451
2452 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2453 {
2454         struct ip6_sf_list *psf = NULL;
2455         struct ifmcaddr6 *im = NULL;
2456         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2457         struct net *net = seq_file_net(seq);
2458
2459         state->idev = NULL;
2460         state->im = NULL;
2461         for_each_netdev_rcu(net, state->dev) {
2462                 struct inet6_dev *idev;
2463                 idev = __in6_dev_get(state->dev);
2464                 if (unlikely(idev == NULL))
2465                         continue;
2466                 read_lock_bh(&idev->lock);
2467                 im = idev->mc_list;
2468                 if (likely(im != NULL)) {
2469                         spin_lock_bh(&im->mca_lock);
2470                         psf = im->mca_sources;
2471                         if (likely(psf != NULL)) {
2472                                 state->im = im;
2473                                 state->idev = idev;
2474                                 break;
2475                         }
2476                         spin_unlock_bh(&im->mca_lock);
2477                 }
2478                 read_unlock_bh(&idev->lock);
2479         }
2480         return psf;
2481 }
2482
2483 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2484 {
2485         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2486
2487         psf = psf->sf_next;
2488         while (!psf) {
2489                 spin_unlock_bh(&state->im->mca_lock);
2490                 state->im = state->im->next;
2491                 while (!state->im) {
2492                         if (likely(state->idev != NULL))
2493                                 read_unlock_bh(&state->idev->lock);
2494
2495                         state->dev = next_net_device_rcu(state->dev);
2496                         if (!state->dev) {
2497                                 state->idev = NULL;
2498                                 goto out;
2499                         }
2500                         state->idev = __in6_dev_get(state->dev);
2501                         if (!state->idev)
2502                                 continue;
2503                         read_lock_bh(&state->idev->lock);
2504                         state->im = state->idev->mc_list;
2505                 }
2506                 if (!state->im)
2507                         break;
2508                 spin_lock_bh(&state->im->mca_lock);
2509                 psf = state->im->mca_sources;
2510         }
2511 out:
2512         return psf;
2513 }
2514
2515 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2516 {
2517         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2518         if (psf)
2519                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2520                         --pos;
2521         return pos ? NULL : psf;
2522 }
2523
2524 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2525         __acquires(RCU)
2526 {
2527         rcu_read_lock();
2528         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2529 }
2530
2531 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2532 {
2533         struct ip6_sf_list *psf;
2534         if (v == SEQ_START_TOKEN)
2535                 psf = igmp6_mcf_get_first(seq);
2536         else
2537                 psf = igmp6_mcf_get_next(seq, v);
2538         ++*pos;
2539         return psf;
2540 }
2541
2542 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2543         __releases(RCU)
2544 {
2545         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2546         if (likely(state->im != NULL)) {
2547                 spin_unlock_bh(&state->im->mca_lock);
2548                 state->im = NULL;
2549         }
2550         if (likely(state->idev != NULL)) {
2551                 read_unlock_bh(&state->idev->lock);
2552                 state->idev = NULL;
2553         }
2554         state->dev = NULL;
2555         rcu_read_unlock();
2556 }
2557
2558 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2559 {
2560         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2561         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2562
2563         if (v == SEQ_START_TOKEN) {
2564                 seq_printf(seq,
2565                            "%3s %6s "
2566                            "%32s %32s %6s %6s\n", "Idx",
2567                            "Device", "Multicast Address",
2568                            "Source Address", "INC", "EXC");
2569         } else {
2570                 seq_printf(seq,
2571                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2572                            state->dev->ifindex, state->dev->name,
2573                            &state->im->mca_addr,
2574                            &psf->sf_addr,
2575                            psf->sf_count[MCAST_INCLUDE],
2576                            psf->sf_count[MCAST_EXCLUDE]);
2577         }
2578         return 0;
2579 }
2580
2581 static const struct seq_operations igmp6_mcf_seq_ops = {
2582         .start  =       igmp6_mcf_seq_start,
2583         .next   =       igmp6_mcf_seq_next,
2584         .stop   =       igmp6_mcf_seq_stop,
2585         .show   =       igmp6_mcf_seq_show,
2586 };
2587
2588 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2589 {
2590         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2591                             sizeof(struct igmp6_mcf_iter_state));
2592 }
2593
2594 static const struct file_operations igmp6_mcf_seq_fops = {
2595         .owner          =       THIS_MODULE,
2596         .open           =       igmp6_mcf_seq_open,
2597         .read           =       seq_read,
2598         .llseek         =       seq_lseek,
2599         .release        =       seq_release_net,
2600 };
2601
2602 static int __net_init igmp6_proc_init(struct net *net)
2603 {
2604         int err;
2605
2606         err = -ENOMEM;
2607         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2608                 goto out;
2609         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2610                                   &igmp6_mcf_seq_fops))
2611                 goto out_proc_net_igmp6;
2612
2613         err = 0;
2614 out:
2615         return err;
2616
2617 out_proc_net_igmp6:
2618         proc_net_remove(net, "igmp6");
2619         goto out;
2620 }
2621
2622 static void __net_exit igmp6_proc_exit(struct net *net)
2623 {
2624         proc_net_remove(net, "mcfilter6");
2625         proc_net_remove(net, "igmp6");
2626 }
2627 #else
2628 static inline int igmp6_proc_init(struct net *net)
2629 {
2630         return 0;
2631 }
2632 static inline void igmp6_proc_exit(struct net *net)
2633 {
2634 }
2635 #endif
2636
2637 static int __net_init igmp6_net_init(struct net *net)
2638 {
2639         int err;
2640
2641         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2642                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2643         if (err < 0) {
2644                 printk(KERN_ERR
2645                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2646                        err);
2647                 goto out;
2648         }
2649
2650         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2651
2652         err = igmp6_proc_init(net);
2653         if (err)
2654                 goto out_sock_create;
2655 out:
2656         return err;
2657
2658 out_sock_create:
2659         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2660         goto out;
2661 }
2662
2663 static void __net_exit igmp6_net_exit(struct net *net)
2664 {
2665         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2666         igmp6_proc_exit(net);
2667 }
2668
2669 static struct pernet_operations igmp6_net_ops = {
2670         .init = igmp6_net_init,
2671         .exit = igmp6_net_exit,
2672 };
2673
2674 int __init igmp6_init(void)
2675 {
2676         return register_pernet_subsys(&igmp6_net_ops);
2677 }
2678
2679 void igmp6_cleanup(void)
2680 {
2681         unregister_pernet_subsys(&igmp6_net_ops);
2682 }