Pileus Git - ~andy/linux/blob - 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 <linux/pkt_sched.h>
  48 #include <net/mld.h>
  49
  50 #include <linux/netfilter.h>
  51 #include <linux/netfilter_ipv6.h>
  52
  53 #include <net/net_namespace.h>
  54 #include <net/sock.h>
  55 #include <net/snmp.h>
  56
  57 #include <net/ipv6.h>
  58 #include <net/protocol.h>
  59 #include <net/if_inet6.h>
  60 #include <net/ndisc.h>
  61 #include <net/addrconf.h>
  62 #include <net/ip6_route.h>
  63 #include <net/inet_common.h>
  64
  65 #include <net/ip6_checksum.h>
  66
  67 /* Set to 3 to get tracing... */
  68 #define MCAST_DEBUG 2
  69
  70 #if MCAST_DEBUG >= 3
  71 #define MDBG(x) printk x
  72 #else
  73 #define MDBG(x)
  74 #endif
  75
  76 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  77 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  80         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  81 };
  82
  83 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  84
  85 /* Big mc list lock for all the sockets */
  86 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  87
  88 static void igmp6_join_group(struct ifmcaddr6 *ma);
  89 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  90 static void igmp6_timer_handler(unsigned long data);
  91
  92 static void mld_gq_timer_expire(unsigned long data);
  93 static void mld_ifc_timer_expire(unsigned long data);
  94 static void mld_ifc_event(struct inet6_dev *idev);
  95 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  96 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  97 static void mld_clear_delrec(struct inet6_dev *idev);
  98 static int sf_setstate(struct ifmcaddr6 *pmc);
  99 static void sf_markstate(struct ifmcaddr6 *pmc);
 100 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 101 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 102                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 103                           int delta);
 104 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 105                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 106                           int delta);
 107 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 108                             struct inet6_dev *idev);
 109
 110
 111 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 112 #define MLD_QRV_DEFAULT         2
 113
 114 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 115                 (idev)->cnf.force_mld_version == 1 || \
 116                 ((idev)->mc_v1_seen && \
 117                 time_before(jiffies, (idev)->mc_v1_seen)))
 118
 119 #define IPV6_MLD_MAX_MSF        64
 120
 121 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 122
 123 /*
 124  *      socket join on multicast group
 125  */
 126
 127 #define for_each_pmc_rcu(np, pmc)                               \
 128         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 129              pmc != NULL;                                       \
 130              pmc = rcu_dereference(pmc->next))
 131
 132 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 133 {
 134         struct net_device *dev = NULL;
 135         struct ipv6_mc_socklist *mc_lst;
 136         struct ipv6_pinfo *np = inet6_sk(sk);
 137         struct net *net = sock_net(sk);
 138         int err;
 139
 140         if (!ipv6_addr_is_multicast(addr))
 141                 return -EINVAL;
 142
 143         rcu_read_lock();
 144         for_each_pmc_rcu(np, mc_lst) {
 145                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 146                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 147                         rcu_read_unlock();
 148                         return -EADDRINUSE;
 149                 }
 150         }
 151         rcu_read_unlock();
 152
 153         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 154
 155         if (mc_lst == NULL)
 156                 return -ENOMEM;
 157
 158         mc_lst->next = NULL;
 159         mc_lst->addr = *addr;
 160
 161         rcu_read_lock();
 162         if (ifindex == 0) {
 163                 struct rt6_info *rt;
 164                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 165                 if (rt) {
 166                         dev = rt->dst.dev;
 167                         ip6_rt_put(rt);
 168                 }
 169         } else
 170                 dev = dev_get_by_index_rcu(net, ifindex);
 171
 172         if (dev == NULL) {
 173                 rcu_read_unlock();
 174                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 175                 return -ENODEV;
 176         }
 177
 178         mc_lst->ifindex = dev->ifindex;
 179         mc_lst->sfmode = MCAST_EXCLUDE;
 180         rwlock_init(&mc_lst->sflock);
 181         mc_lst->sflist = NULL;
 182
 183         /*
 184          *      now add/increase the group membership on the device
 185          */
 186
 187         err = ipv6_dev_mc_inc(dev, addr);
 188
 189         if (err) {
 190                 rcu_read_unlock();
 191                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 192                 return err;
 193         }
 194
 195         spin_lock(&ipv6_sk_mc_lock);
 196         mc_lst->next = np->ipv6_mc_list;
 197         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 198         spin_unlock(&ipv6_sk_mc_lock);
 199
 200         rcu_read_unlock();
 201
 202         return 0;
 203 }
 204
 205 /*
 206  *      socket leave on multicast group
 207  */
 208 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 209 {
 210         struct ipv6_pinfo *np = inet6_sk(sk);
 211         struct ipv6_mc_socklist *mc_lst;
 212         struct ipv6_mc_socklist __rcu **lnk;
 213         struct net *net = sock_net(sk);
 214
 215         if (!ipv6_addr_is_multicast(addr))
 216                 return -EINVAL;
 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                         kfree_rcu(mc_lst, rcu);
 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                                              const 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->dst.dev;
 264                         ip6_rt_put(rt);
 265                 }
 266         } else
 267                 dev = dev_get_by_index_rcu(net, ifindex);
 268
 269         if (!dev)
 270                 return NULL;
 271         idev = __in6_dev_get(dev);
 272         if (!idev)
 273                 return NULL;
 274         read_lock_bh(&idev->lock);
 275         if (idev->dead) {
 276                 read_unlock_bh(&idev->lock);
 277                 return NULL;
 278         }
 279         return idev;
 280 }
 281
 282 void ipv6_sock_mc_close(struct sock *sk)
 283 {
 284         struct ipv6_pinfo *np = inet6_sk(sk);
 285         struct ipv6_mc_socklist *mc_lst;
 286         struct net *net = sock_net(sk);
 287
 288         if (!rcu_access_pointer(np->ipv6_mc_list))
 289                 return;
 290
 291         spin_lock(&ipv6_sk_mc_lock);
 292         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 293                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 294                 struct net_device *dev;
 295
 296                 np->ipv6_mc_list = mc_lst->next;
 297                 spin_unlock(&ipv6_sk_mc_lock);
 298
 299                 rcu_read_lock();
 300                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 301                 if (dev) {
 302                         struct inet6_dev *idev = __in6_dev_get(dev);
 303
 304                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 305                         if (idev)
 306                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 307                 } else
 308                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 309                 rcu_read_unlock();
 310
 311                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 312                 kfree_rcu(mc_lst, rcu);
 313
 314                 spin_lock(&ipv6_sk_mc_lock);
 315         }
 316         spin_unlock(&ipv6_sk_mc_lock);
 317 }
 318
 319 int ip6_mc_source(int add, int omode, struct sock *sk,
 320         struct group_source_req *pgsr)
 321 {
 322         struct in6_addr *source, *group;
 323         struct ipv6_mc_socklist *pmc;
 324         struct inet6_dev *idev;
 325         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 326         struct ip6_sf_socklist *psl;
 327         struct net *net = sock_net(sk);
 328         int i, j, rv;
 329         int leavegroup = 0;
 330         int pmclocked = 0;
 331         int err;
 332
 333         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 334         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 335
 336         if (!ipv6_addr_is_multicast(group))
 337                 return -EINVAL;
 338
 339         rcu_read_lock();
 340         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 341         if (!idev) {
 342                 rcu_read_unlock();
 343                 return -ENODEV;
 344         }
 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 = !ipv6_addr_equal(&psl->sl_addr[i], source);
 381                         if (rv == 0)
 382                                 break;
 383                 }
 384                 if (rv)         /* source not found */
 385                         goto done;      /* err = -EADDRNOTAVAIL */
 386
 387                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 388                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 389                         leavegroup = 1;
 390                         goto done;
 391                 }
 392
 393                 /* update the interface filter */
 394                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 395
 396                 for (j=i+1; j<psl->sl_count; j++)
 397                         psl->sl_addr[j-1] = psl->sl_addr[j];
 398                 psl->sl_count--;
 399                 err = 0;
 400                 goto done;
 401         }
 402         /* else, add a new source to the filter */
 403
 404         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 405                 err = -ENOBUFS;
 406                 goto done;
 407         }
 408         if (!psl || psl->sl_count == psl->sl_max) {
 409                 struct ip6_sf_socklist *newpsl;
 410                 int count = IP6_SFBLOCK;
 411
 412                 if (psl)
 413                         count += psl->sl_max;
 414                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 415                 if (!newpsl) {
 416                         err = -ENOBUFS;
 417                         goto done;
 418                 }
 419                 newpsl->sl_max = count;
 420                 newpsl->sl_count = count - IP6_SFBLOCK;
 421                 if (psl) {
 422                         for (i=0; i<psl->sl_count; i++)
 423                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 424                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 425                 }
 426                 pmc->sflist = psl = newpsl;
 427         }
 428         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 429         for (i=0; i<psl->sl_count; i++) {
 430                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 431                 if (rv == 0) /* There is an error in the address. */
 432                         goto done;
 433         }
 434         for (j=psl->sl_count-1; j>=i; j--)
 435                 psl->sl_addr[j+1] = psl->sl_addr[j];
 436         psl->sl_addr[i] = *source;
 437         psl->sl_count++;
 438         err = 0;
 439         /* update the interface list */
 440         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 441 done:
 442         if (pmclocked)
 443                 write_unlock(&pmc->sflock);
 444         read_unlock_bh(&idev->lock);
 445         rcu_read_unlock();
 446         if (leavegroup)
 447                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 448         return err;
 449 }
 450
 451 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 452 {
 453         const struct in6_addr *group;
 454         struct ipv6_mc_socklist *pmc;
 455         struct inet6_dev *idev;
 456         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 457         struct ip6_sf_socklist *newpsl, *psl;
 458         struct net *net = sock_net(sk);
 459         int leavegroup = 0;
 460         int i, err;
 461
 462         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 463
 464         if (!ipv6_addr_is_multicast(group))
 465                 return -EINVAL;
 466         if (gsf->gf_fmode != MCAST_INCLUDE &&
 467             gsf->gf_fmode != MCAST_EXCLUDE)
 468                 return -EINVAL;
 469
 470         rcu_read_lock();
 471         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 472
 473         if (!idev) {
 474                 rcu_read_unlock();
 475                 return -ENODEV;
 476         }
 477
 478         err = 0;
 479
 480         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 481                 leavegroup = 1;
 482                 goto done;
 483         }
 484
 485         for_each_pmc_rcu(inet6, pmc) {
 486                 if (pmc->ifindex != gsf->gf_interface)
 487                         continue;
 488                 if (ipv6_addr_equal(&pmc->addr, group))
 489                         break;
 490         }
 491         if (!pmc) {             /* must have a prior join */
 492                 err = -EINVAL;
 493                 goto done;
 494         }
 495         if (gsf->gf_numsrc) {
 496                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 497                                                           GFP_ATOMIC);
 498                 if (!newpsl) {
 499                         err = -ENOBUFS;
 500                         goto done;
 501                 }
 502                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 503                 for (i=0; i<newpsl->sl_count; ++i) {
 504                         struct sockaddr_in6 *psin6;
 505
 506                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 507                         newpsl->sl_addr[i] = psin6->sin6_addr;
 508                 }
 509                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 510                         newpsl->sl_count, newpsl->sl_addr, 0);
 511                 if (err) {
 512                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 513                         goto done;
 514                 }
 515         } else {
 516                 newpsl = NULL;
 517                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 518         }
 519
 520         write_lock(&pmc->sflock);
 521         psl = pmc->sflist;
 522         if (psl) {
 523                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 524                         psl->sl_count, psl->sl_addr, 0);
 525                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 526         } else
 527                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 528         pmc->sflist = newpsl;
 529         pmc->sfmode = gsf->gf_fmode;
 530         write_unlock(&pmc->sflock);
 531         err = 0;
 532 done:
 533         read_unlock_bh(&idev->lock);
 534         rcu_read_unlock();
 535         if (leavegroup)
 536                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 537         return err;
 538 }
 539
 540 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 541         struct group_filter __user *optval, int __user *optlen)
 542 {
 543         int err, i, count, copycount;
 544         const struct in6_addr *group;
 545         struct ipv6_mc_socklist *pmc;
 546         struct inet6_dev *idev;
 547         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 548         struct ip6_sf_socklist *psl;
 549         struct net *net = sock_net(sk);
 550
 551         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 552
 553         if (!ipv6_addr_is_multicast(group))
 554                 return -EINVAL;
 555
 556         rcu_read_lock();
 557         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 558
 559         if (!idev) {
 560                 rcu_read_unlock();
 561                 return -ENODEV;
 562         }
 563
 564         err = -EADDRNOTAVAIL;
 565         /*
 566          * changes to the ipv6_mc_list require the socket lock and
 567          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 568          * so reading the list is safe.
 569          */
 570
 571         for_each_pmc_rcu(inet6, pmc) {
 572                 if (pmc->ifindex != gsf->gf_interface)
 573                         continue;
 574                 if (ipv6_addr_equal(group, &pmc->addr))
 575                         break;
 576         }
 577         if (!pmc)               /* must have a prior join */
 578                 goto done;
 579         gsf->gf_fmode = pmc->sfmode;
 580         psl = pmc->sflist;
 581         count = psl ? psl->sl_count : 0;
 582         read_unlock_bh(&idev->lock);
 583         rcu_read_unlock();
 584
 585         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 586         gsf->gf_numsrc = count;
 587         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 588             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 589                 return -EFAULT;
 590         }
 591         /* changes to psl require the socket lock, a read lock on
 592          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 593          * have the socket lock, so reading here is safe.
 594          */
 595         for (i=0; i<copycount; i++) {
 596                 struct sockaddr_in6 *psin6;
 597                 struct sockaddr_storage ss;
 598
 599                 psin6 = (struct sockaddr_in6 *)&ss;
 600                 memset(&ss, 0, sizeof(ss));
 601                 psin6->sin6_family = AF_INET6;
 602                 psin6->sin6_addr = psl->sl_addr[i];
 603                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 604                         return -EFAULT;
 605         }
 606         return 0;
 607 done:
 608         read_unlock_bh(&idev->lock);
 609         rcu_read_unlock();
 610         return err;
 611 }
 612
 613 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 614                     const struct in6_addr *src_addr)
 615 {
 616         struct ipv6_pinfo *np = inet6_sk(sk);
 617         struct ipv6_mc_socklist *mc;
 618         struct ip6_sf_socklist *psl;
 619         bool rv = true;
 620
 621         rcu_read_lock();
 622         for_each_pmc_rcu(np, mc) {
 623                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 624                         break;
 625         }
 626         if (!mc) {
 627                 rcu_read_unlock();
 628                 return true;
 629         }
 630         read_lock(&mc->sflock);
 631         psl = mc->sflist;
 632         if (!psl) {
 633                 rv = mc->sfmode == MCAST_EXCLUDE;
 634         } else {
 635                 int i;
 636
 637                 for (i=0; i<psl->sl_count; i++) {
 638                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 639                                 break;
 640                 }
 641                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 642                         rv = false;
 643                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 644                         rv = false;
 645         }
 646         read_unlock(&mc->sflock);
 647         rcu_read_unlock();
 648
 649         return rv;
 650 }
 651
 652 static void ma_put(struct ifmcaddr6 *mc)
 653 {
 654         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 655                 in6_dev_put(mc->idev);
 656                 kfree(mc);
 657         }
 658 }
 659
 660 static void igmp6_group_added(struct ifmcaddr6 *mc)
 661 {
 662         struct net_device *dev = mc->idev->dev;
 663         char buf[MAX_ADDR_LEN];
 664
 665         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 666             IPV6_ADDR_SCOPE_LINKLOCAL)
 667                 return;
 668
 669         spin_lock_bh(&mc->mca_lock);
 670         if (!(mc->mca_flags&MAF_LOADED)) {
 671                 mc->mca_flags |= MAF_LOADED;
 672                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 673                         dev_mc_add(dev, buf);
 674         }
 675         spin_unlock_bh(&mc->mca_lock);
 676
 677         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 678                 return;
 679
 680         if (MLD_V1_SEEN(mc->idev)) {
 681                 igmp6_join_group(mc);
 682                 return;
 683         }
 684         /* else v2 */
 685
 686         mc->mca_crcount = mc->idev->mc_qrv;
 687         mld_ifc_event(mc->idev);
 688 }
 689
 690 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 691 {
 692         struct net_device *dev = mc->idev->dev;
 693         char buf[MAX_ADDR_LEN];
 694
 695         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 696             IPV6_ADDR_SCOPE_LINKLOCAL)
 697                 return;
 698
 699         spin_lock_bh(&mc->mca_lock);
 700         if (mc->mca_flags&MAF_LOADED) {
 701                 mc->mca_flags &= ~MAF_LOADED;
 702                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 703                         dev_mc_del(dev, buf);
 704         }
 705
 706         if (mc->mca_flags & MAF_NOREPORT)
 707                 goto done;
 708         spin_unlock_bh(&mc->mca_lock);
 709
 710         if (!mc->idev->dead)
 711                 igmp6_leave_group(mc);
 712
 713         spin_lock_bh(&mc->mca_lock);
 714         if (del_timer(&mc->mca_timer))
 715                 atomic_dec(&mc->mca_refcnt);
 716 done:
 717         ip6_mc_clear_src(mc);
 718         spin_unlock_bh(&mc->mca_lock);
 719 }
 720
 721 /*
 722  * deleted ifmcaddr6 manipulation
 723  */
 724 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 725 {
 726         struct ifmcaddr6 *pmc;
 727
 728         /* this is an "ifmcaddr6" for convenience; only the fields below
 729          * are actually used. In particular, the refcnt and users are not
 730          * used for management of the delete list. Using the same structure
 731          * for deleted items allows change reports to use common code with
 732          * non-deleted or query-response MCA's.
 733          */
 734         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 735         if (!pmc)
 736                 return;
 737
 738         spin_lock_bh(&im->mca_lock);
 739         spin_lock_init(&pmc->mca_lock);
 740         pmc->idev = im->idev;
 741         in6_dev_hold(idev);
 742         pmc->mca_addr = im->mca_addr;
 743         pmc->mca_crcount = idev->mc_qrv;
 744         pmc->mca_sfmode = im->mca_sfmode;
 745         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 746                 struct ip6_sf_list *psf;
 747
 748                 pmc->mca_tomb = im->mca_tomb;
 749                 pmc->mca_sources = im->mca_sources;
 750                 im->mca_tomb = im->mca_sources = NULL;
 751                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 752                         psf->sf_crcount = pmc->mca_crcount;
 753         }
 754         spin_unlock_bh(&im->mca_lock);
 755
 756         spin_lock_bh(&idev->mc_lock);
 757         pmc->next = idev->mc_tomb;
 758         idev->mc_tomb = pmc;
 759         spin_unlock_bh(&idev->mc_lock);
 760 }
 761
 762 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 763 {
 764         struct ifmcaddr6 *pmc, *pmc_prev;
 765         struct ip6_sf_list *psf, *psf_next;
 766
 767         spin_lock_bh(&idev->mc_lock);
 768         pmc_prev = NULL;
 769         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 770                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 771                         break;
 772                 pmc_prev = pmc;
 773         }
 774         if (pmc) {
 775                 if (pmc_prev)
 776                         pmc_prev->next = pmc->next;
 777                 else
 778                         idev->mc_tomb = pmc->next;
 779         }
 780         spin_unlock_bh(&idev->mc_lock);
 781
 782         if (pmc) {
 783                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 784                         psf_next = psf->sf_next;
 785                         kfree(psf);
 786                 }
 787                 in6_dev_put(pmc->idev);
 788                 kfree(pmc);
 789         }
 790 }
 791
 792 static void mld_clear_delrec(struct inet6_dev *idev)
 793 {
 794         struct ifmcaddr6 *pmc, *nextpmc;
 795
 796         spin_lock_bh(&idev->mc_lock);
 797         pmc = idev->mc_tomb;
 798         idev->mc_tomb = NULL;
 799         spin_unlock_bh(&idev->mc_lock);
 800
 801         for (; pmc; pmc = nextpmc) {
 802                 nextpmc = pmc->next;
 803                 ip6_mc_clear_src(pmc);
 804                 in6_dev_put(pmc->idev);
 805                 kfree(pmc);
 806         }
 807
 808         /* clear dead sources, too */
 809         read_lock_bh(&idev->lock);
 810         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 811                 struct ip6_sf_list *psf, *psf_next;
 812
 813                 spin_lock_bh(&pmc->mca_lock);
 814                 psf = pmc->mca_tomb;
 815                 pmc->mca_tomb = NULL;
 816                 spin_unlock_bh(&pmc->mca_lock);
 817                 for (; psf; psf=psf_next) {
 818                         psf_next = psf->sf_next;
 819                         kfree(psf);
 820                 }
 821         }
 822         read_unlock_bh(&idev->lock);
 823 }
 824
 825
 826 /*
 827  *      device multicast group inc (add if not found)
 828  */
 829 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 830 {
 831         struct ifmcaddr6 *mc;
 832         struct inet6_dev *idev;
 833
 834         /* we need to take a reference on idev */
 835         idev = in6_dev_get(dev);
 836
 837         if (idev == NULL)
 838                 return -EINVAL;
 839
 840         write_lock_bh(&idev->lock);
 841         if (idev->dead) {
 842                 write_unlock_bh(&idev->lock);
 843                 in6_dev_put(idev);
 844                 return -ENODEV;
 845         }
 846
 847         for (mc = idev->mc_list; mc; mc = mc->next) {
 848                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 849                         mc->mca_users++;
 850                         write_unlock_bh(&idev->lock);
 851                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 852                                 NULL, 0);
 853                         in6_dev_put(idev);
 854                         return 0;
 855                 }
 856         }
 857
 858         /*
 859          *      not found: create a new one.
 860          */
 861
 862         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 863
 864         if (mc == NULL) {
 865                 write_unlock_bh(&idev->lock);
 866                 in6_dev_put(idev);
 867                 return -ENOMEM;
 868         }
 869
 870         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 871
 872         mc->mca_addr = *addr;
 873         mc->idev = idev; /* (reference taken) */
 874         mc->mca_users = 1;
 875         /* mca_stamp should be updated upon changes */
 876         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 877         atomic_set(&mc->mca_refcnt, 2);
 878         spin_lock_init(&mc->mca_lock);
 879
 880         /* initial mode is (EX, empty) */
 881         mc->mca_sfmode = MCAST_EXCLUDE;
 882         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 883
 884         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 885             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 886                 mc->mca_flags |= MAF_NOREPORT;
 887
 888         mc->next = idev->mc_list;
 889         idev->mc_list = mc;
 890         write_unlock_bh(&idev->lock);
 891
 892         mld_del_delrec(idev, &mc->mca_addr);
 893         igmp6_group_added(mc);
 894         ma_put(mc);
 895         return 0;
 896 }
 897
 898 /*
 899  *      device multicast group del
 900  */
 901 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 902 {
 903         struct ifmcaddr6 *ma, **map;
 904
 905         write_lock_bh(&idev->lock);
 906         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 907                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 908                         if (--ma->mca_users == 0) {
 909                                 *map = ma->next;
 910                                 write_unlock_bh(&idev->lock);
 911
 912                                 igmp6_group_dropped(ma);
 913
 914                                 ma_put(ma);
 915                                 return 0;
 916                         }
 917                         write_unlock_bh(&idev->lock);
 918                         return 0;
 919                 }
 920         }
 921         write_unlock_bh(&idev->lock);
 922
 923         return -ENOENT;
 924 }
 925
 926 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 927 {
 928         struct inet6_dev *idev;
 929         int err;
 930
 931         rcu_read_lock();
 932
 933         idev = __in6_dev_get(dev);
 934         if (!idev)
 935                 err = -ENODEV;
 936         else
 937                 err = __ipv6_dev_mc_dec(idev, addr);
 938
 939         rcu_read_unlock();
 940         return err;
 941 }
 942
 943 /*
 944  *      check if the interface/address pair is valid
 945  */
 946 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 947                          const struct in6_addr *src_addr)
 948 {
 949         struct inet6_dev *idev;
 950         struct ifmcaddr6 *mc;
 951         bool rv = false;
 952
 953         rcu_read_lock();
 954         idev = __in6_dev_get(dev);
 955         if (idev) {
 956                 read_lock_bh(&idev->lock);
 957                 for (mc = idev->mc_list; mc; mc=mc->next) {
 958                         if (ipv6_addr_equal(&mc->mca_addr, group))
 959                                 break;
 960                 }
 961                 if (mc) {
 962                         if (src_addr && !ipv6_addr_any(src_addr)) {
 963                                 struct ip6_sf_list *psf;
 964
 965                                 spin_lock_bh(&mc->mca_lock);
 966                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 967                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 968                                                 break;
 969                                 }
 970                                 if (psf)
 971                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 972                                                 psf->sf_count[MCAST_EXCLUDE] !=
 973                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 974                                 else
 975                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 976                                 spin_unlock_bh(&mc->mca_lock);
 977                         } else
 978                                 rv = true; /* don't filter unspecified source */
 979                 }
 980                 read_unlock_bh(&idev->lock);
 981         }
 982         rcu_read_unlock();
 983         return rv;
 984 }
 985
 986 static void mld_gq_start_timer(struct inet6_dev *idev)
 987 {
 988         int tv = net_random() % idev->mc_maxdelay;
 989
 990         idev->mc_gq_running = 1;
 991         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
 992                 in6_dev_hold(idev);
 993 }
 994
 995 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
 996 {
 997         int tv = net_random() % delay;
 998
 999         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1000                 in6_dev_hold(idev);
1001 }
1002
1003 static void mld_dad_start_timer(struct inet6_dev *idev, int delay)
1004 {
1005         int tv = net_random() % delay;
1006
1007         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1008                 in6_dev_hold(idev);
1009 }
1010
1011 /*
1012  *      IGMP handling (alias multicast ICMPv6 messages)
1013  */
1014
1015 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1016 {
1017         unsigned long delay = resptime;
1018
1019         /* Do not start timer for these addresses */
1020         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1021             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1022                 return;
1023
1024         if (del_timer(&ma->mca_timer)) {
1025                 atomic_dec(&ma->mca_refcnt);
1026                 delay = ma->mca_timer.expires - jiffies;
1027         }
1028
1029         if (delay >= resptime) {
1030                 if (resptime)
1031                         delay = net_random() % resptime;
1032                 else
1033                         delay = 1;
1034         }
1035         ma->mca_timer.expires = jiffies + delay;
1036         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1037                 atomic_inc(&ma->mca_refcnt);
1038         ma->mca_flags |= MAF_TIMER_RUNNING;
1039 }
1040
1041 /* mark EXCLUDE-mode sources */
1042 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1043                              const struct in6_addr *srcs)
1044 {
1045         struct ip6_sf_list *psf;
1046         int i, scount;
1047
1048         scount = 0;
1049         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1050                 if (scount == nsrcs)
1051                         break;
1052                 for (i=0; i<nsrcs; i++) {
1053                         /* skip inactive filters */
1054                         if (psf->sf_count[MCAST_INCLUDE] ||
1055                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1056                             psf->sf_count[MCAST_EXCLUDE])
1057                                 break;
1058                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1059                                 scount++;
1060                                 break;
1061                         }
1062                 }
1063         }
1064         pmc->mca_flags &= ~MAF_GSQUERY;
1065         if (scount == nsrcs)    /* all sources excluded */
1066                 return false;
1067         return true;
1068 }
1069
1070 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1071                             const struct in6_addr *srcs)
1072 {
1073         struct ip6_sf_list *psf;
1074         int i, scount;
1075
1076         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1077                 return mld_xmarksources(pmc, nsrcs, srcs);
1078
1079         /* mark INCLUDE-mode sources */
1080
1081         scount = 0;
1082         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1083                 if (scount == nsrcs)
1084                         break;
1085                 for (i=0; i<nsrcs; i++) {
1086                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1087                                 psf->sf_gsresp = 1;
1088                                 scount++;
1089                                 break;
1090                         }
1091                 }
1092         }
1093         if (!scount) {
1094                 pmc->mca_flags &= ~MAF_GSQUERY;
1095                 return false;
1096         }
1097         pmc->mca_flags |= MAF_GSQUERY;
1098         return true;
1099 }
1100
1101 /* called with rcu_read_lock() */
1102 int igmp6_event_query(struct sk_buff *skb)
1103 {
1104         struct mld2_query *mlh2 = NULL;
1105         struct ifmcaddr6 *ma;
1106         const struct in6_addr *group;
1107         unsigned long max_delay;
1108         struct inet6_dev *idev;
1109         struct mld_msg *mld;
1110         int group_type;
1111         int mark = 0;
1112         int len;
1113
1114         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1115                 return -EINVAL;
1116
1117         /* compute payload length excluding extension headers */
1118         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1119         len -= skb_network_header_len(skb);
1120
1121         /* Drop queries with not link local source */
1122         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1123                 return -EINVAL;
1124
1125         idev = __in6_dev_get(skb->dev);
1126
1127         if (idev == NULL)
1128                 return 0;
1129
1130         mld = (struct mld_msg *)icmp6_hdr(skb);
1131         group = &mld->mld_mca;
1132         group_type = ipv6_addr_type(group);
1133
1134         if (group_type != IPV6_ADDR_ANY &&
1135             !(group_type&IPV6_ADDR_MULTICAST))
1136                 return -EINVAL;
1137
1138         if (len == 24) {
1139                 int switchback;
1140                 /* MLDv1 router present */
1141
1142                 /* Translate milliseconds to jiffies */
1143                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1144
1145                 switchback = (idev->mc_qrv + 1) * max_delay;
1146                 idev->mc_v1_seen = jiffies + switchback;
1147
1148                 /* cancel the interface change timer */
1149                 idev->mc_ifc_count = 0;
1150                 if (del_timer(&idev->mc_ifc_timer))
1151                         __in6_dev_put(idev);
1152                 /* clear deleted report items */
1153                 mld_clear_delrec(idev);
1154         } else if (len >= 28) {
1155                 int srcs_offset = sizeof(struct mld2_query) -
1156                                   sizeof(struct icmp6hdr);
1157                 if (!pskb_may_pull(skb, srcs_offset))
1158                         return -EINVAL;
1159
1160                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1161                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1162                 if (!max_delay)
1163                         max_delay = 1;
1164                 idev->mc_maxdelay = max_delay;
1165                 if (mlh2->mld2q_qrv)
1166                         idev->mc_qrv = mlh2->mld2q_qrv;
1167                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1168                         if (mlh2->mld2q_nsrcs)
1169                                 return -EINVAL; /* no sources allowed */
1170
1171                         mld_gq_start_timer(idev);
1172                         return 0;
1173                 }
1174                 /* mark sources to include, if group & source-specific */
1175                 if (mlh2->mld2q_nsrcs != 0) {
1176                         if (!pskb_may_pull(skb, srcs_offset +
1177                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1178                                 return -EINVAL;
1179
1180                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1181                         mark = 1;
1182                 }
1183         } else
1184                 return -EINVAL;
1185
1186         read_lock_bh(&idev->lock);
1187         if (group_type == IPV6_ADDR_ANY) {
1188                 for (ma = idev->mc_list; ma; ma=ma->next) {
1189                         spin_lock_bh(&ma->mca_lock);
1190                         igmp6_group_queried(ma, max_delay);
1191                         spin_unlock_bh(&ma->mca_lock);
1192                 }
1193         } else {
1194                 for (ma = idev->mc_list; ma; ma=ma->next) {
1195                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1196                                 continue;
1197                         spin_lock_bh(&ma->mca_lock);
1198                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1199                                 /* gsquery <- gsquery && mark */
1200                                 if (!mark)
1201                                         ma->mca_flags &= ~MAF_GSQUERY;
1202                         } else {
1203                                 /* gsquery <- mark */
1204                                 if (mark)
1205                                         ma->mca_flags |= MAF_GSQUERY;
1206                                 else
1207                                         ma->mca_flags &= ~MAF_GSQUERY;
1208                         }
1209                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1210                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1211                                 igmp6_group_queried(ma, max_delay);
1212                         spin_unlock_bh(&ma->mca_lock);
1213                         break;
1214                 }
1215         }
1216         read_unlock_bh(&idev->lock);
1217
1218         return 0;
1219 }
1220
1221 /* called with rcu_read_lock() */
1222 int igmp6_event_report(struct sk_buff *skb)
1223 {
1224         struct ifmcaddr6 *ma;
1225         struct inet6_dev *idev;
1226         struct mld_msg *mld;
1227         int addr_type;
1228
1229         /* Our own report looped back. Ignore it. */
1230         if (skb->pkt_type == PACKET_LOOPBACK)
1231                 return 0;
1232
1233         /* send our report if the MC router may not have heard this report */
1234         if (skb->pkt_type != PACKET_MULTICAST &&
1235             skb->pkt_type != PACKET_BROADCAST)
1236                 return 0;
1237
1238         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1239                 return -EINVAL;
1240
1241         mld = (struct mld_msg *)icmp6_hdr(skb);
1242
1243         /* Drop reports with not link local source */
1244         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1245         if (addr_type != IPV6_ADDR_ANY &&
1246             !(addr_type&IPV6_ADDR_LINKLOCAL))
1247                 return -EINVAL;
1248
1249         idev = __in6_dev_get(skb->dev);
1250         if (idev == NULL)
1251                 return -ENODEV;
1252
1253         /*
1254          *      Cancel the timer for this group
1255          */
1256
1257         read_lock_bh(&idev->lock);
1258         for (ma = idev->mc_list; ma; ma=ma->next) {
1259                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1260                         spin_lock(&ma->mca_lock);
1261                         if (del_timer(&ma->mca_timer))
1262                                 atomic_dec(&ma->mca_refcnt);
1263                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1264                         spin_unlock(&ma->mca_lock);
1265                         break;
1266                 }
1267         }
1268         read_unlock_bh(&idev->lock);
1269         return 0;
1270 }
1271
1272 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1273                   int gdeleted, int sdeleted)
1274 {
1275         switch (type) {
1276         case MLD2_MODE_IS_INCLUDE:
1277         case MLD2_MODE_IS_EXCLUDE:
1278                 if (gdeleted || sdeleted)
1279                         return false;
1280                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1281                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1282                                 return true;
1283                         /* don't include if this source is excluded
1284                          * in all filters
1285                          */
1286                         if (psf->sf_count[MCAST_INCLUDE])
1287                                 return type == MLD2_MODE_IS_INCLUDE;
1288                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1289                                 psf->sf_count[MCAST_EXCLUDE];
1290                 }
1291                 return false;
1292         case MLD2_CHANGE_TO_INCLUDE:
1293                 if (gdeleted || sdeleted)
1294                         return false;
1295                 return psf->sf_count[MCAST_INCLUDE] != 0;
1296         case MLD2_CHANGE_TO_EXCLUDE:
1297                 if (gdeleted || sdeleted)
1298                         return false;
1299                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1300                     psf->sf_count[MCAST_INCLUDE])
1301                         return false;
1302                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1303                         psf->sf_count[MCAST_EXCLUDE];
1304         case MLD2_ALLOW_NEW_SOURCES:
1305                 if (gdeleted || !psf->sf_crcount)
1306                         return false;
1307                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1308         case MLD2_BLOCK_OLD_SOURCES:
1309                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1310                         return gdeleted || (psf->sf_crcount && sdeleted);
1311                 return psf->sf_crcount && !gdeleted && !sdeleted;
1312         }
1313         return false;
1314 }
1315
1316 static int
1317 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1318 {
1319         struct ip6_sf_list *psf;
1320         int scount = 0;
1321
1322         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1323                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1324                         continue;
1325                 scount++;
1326         }
1327         return scount;
1328 }
1329
1330 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1331                        struct net_device *dev,
1332                        const struct in6_addr *saddr,
1333                        const struct in6_addr *daddr,
1334                        int proto, int len)
1335 {
1336         struct ipv6hdr *hdr;
1337
1338         skb->protocol = htons(ETH_P_IPV6);
1339         skb->dev = dev;
1340
1341         skb_reset_network_header(skb);
1342         skb_put(skb, sizeof(struct ipv6hdr));
1343         hdr = ipv6_hdr(skb);
1344
1345         ip6_flow_hdr(hdr, 0, 0);
1346
1347         hdr->payload_len = htons(len);
1348         hdr->nexthdr = proto;
1349         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1350
1351         hdr->saddr = *saddr;
1352         hdr->daddr = *daddr;
1353 }
1354
1355 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1356 {
1357         struct net_device *dev = idev->dev;
1358         struct net *net = dev_net(dev);
1359         struct sock *sk = net->ipv6.igmp_sk;
1360         struct sk_buff *skb;
1361         struct mld2_report *pmr;
1362         struct in6_addr addr_buf;
1363         const struct in6_addr *saddr;
1364         int hlen = LL_RESERVED_SPACE(dev);
1365         int tlen = dev->needed_tailroom;
1366         int err;
1367         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1368                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1369                      IPV6_TLV_PADN, 0 };
1370
1371         /* we assume size > sizeof(ra) here */
1372         size += hlen + tlen;
1373         /* limit our allocations to order-0 page */
1374         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1375         skb = sock_alloc_send_skb(sk, size, 1, &err);
1376
1377         if (!skb)
1378                 return NULL;
1379
1380         skb->priority = TC_PRIO_CONTROL;
1381         skb_reserve(skb, hlen);
1382
1383         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1384                 /* <draft-ietf-magma-mld-source-05.txt>:
1385                  * use unspecified address as the source address
1386                  * when a valid link-local address is not available.
1387                  */
1388                 saddr = &in6addr_any;
1389         } else
1390                 saddr = &addr_buf;
1391
1392         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1393
1394         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1395
1396         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1397         skb_put(skb, sizeof(*pmr));
1398         pmr = (struct mld2_report *)skb_transport_header(skb);
1399         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1400         pmr->mld2r_resv1 = 0;
1401         pmr->mld2r_cksum = 0;
1402         pmr->mld2r_resv2 = 0;
1403         pmr->mld2r_ngrec = 0;
1404         return skb;
1405 }
1406
1407 static void mld_sendpack(struct sk_buff *skb)
1408 {
1409         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1410         struct mld2_report *pmr =
1411                               (struct mld2_report *)skb_transport_header(skb);
1412         int payload_len, mldlen;
1413         struct inet6_dev *idev;
1414         struct net *net = dev_net(skb->dev);
1415         int err;
1416         struct flowi6 fl6;
1417         struct dst_entry *dst;
1418
1419         rcu_read_lock();
1420         idev = __in6_dev_get(skb->dev);
1421         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1422
1423         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1424                 sizeof(*pip6);
1425         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1426         pip6->payload_len = htons(payload_len);
1427
1428         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1429                                            IPPROTO_ICMPV6,
1430                                            csum_partial(skb_transport_header(skb),
1431                                                         mldlen, 0));
1432
1433         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1434                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1435                          skb->dev->ifindex);
1436         dst = icmp6_dst_alloc(skb->dev, &fl6);
1437
1438         err = 0;
1439         if (IS_ERR(dst)) {
1440                 err = PTR_ERR(dst);
1441                 dst = NULL;
1442         }
1443         skb_dst_set(skb, dst);
1444         if (err)
1445                 goto err_out;
1446
1447         payload_len = skb->len;
1448
1449         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1450                       dst_output);
1451 out:
1452         if (!err) {
1453                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1454                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1455                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1456         } else
1457                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1458
1459         rcu_read_unlock();
1460         return;
1461
1462 err_out:
1463         kfree_skb(skb);
1464         goto out;
1465 }
1466
1467 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1468 {
1469         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1470 }
1471
1472 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1473         int type, struct mld2_grec **ppgr)
1474 {
1475         struct net_device *dev = pmc->idev->dev;
1476         struct mld2_report *pmr;
1477         struct mld2_grec *pgr;
1478
1479         if (!skb)
1480                 skb = mld_newpack(pmc->idev, dev->mtu);
1481         if (!skb)
1482                 return NULL;
1483         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1484         pgr->grec_type = type;
1485         pgr->grec_auxwords = 0;
1486         pgr->grec_nsrcs = 0;
1487         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1488         pmr = (struct mld2_report *)skb_transport_header(skb);
1489         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1490         *ppgr = pgr;
1491         return skb;
1492 }
1493
1494 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1495         skb_tailroom(skb)) : 0)
1496
1497 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1498         int type, int gdeleted, int sdeleted)
1499 {
1500         struct inet6_dev *idev = pmc->idev;
1501         struct net_device *dev = idev->dev;
1502         struct mld2_report *pmr;
1503         struct mld2_grec *pgr = NULL;
1504         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1505         int scount, stotal, first, isquery, truncate;
1506
1507         if (pmc->mca_flags & MAF_NOREPORT)
1508                 return skb;
1509
1510         isquery = type == MLD2_MODE_IS_INCLUDE ||
1511                   type == MLD2_MODE_IS_EXCLUDE;
1512         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1513                     type == MLD2_CHANGE_TO_EXCLUDE;
1514
1515         stotal = scount = 0;
1516
1517         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1518
1519         if (!*psf_list)
1520                 goto empty_source;
1521
1522         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1523
1524         /* EX and TO_EX get a fresh packet, if needed */
1525         if (truncate) {
1526                 if (pmr && pmr->mld2r_ngrec &&
1527                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1528                         if (skb)
1529                                 mld_sendpack(skb);
1530                         skb = mld_newpack(idev, dev->mtu);
1531                 }
1532         }
1533         first = 1;
1534         psf_prev = NULL;
1535         for (psf=*psf_list; psf; psf=psf_next) {
1536                 struct in6_addr *psrc;
1537
1538                 psf_next = psf->sf_next;
1539
1540                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1541                         psf_prev = psf;
1542                         continue;
1543                 }
1544
1545                 /* clear marks on query responses */
1546                 if (isquery)
1547                         psf->sf_gsresp = 0;
1548
1549                 if (AVAILABLE(skb) < sizeof(*psrc) +
1550                     first*sizeof(struct mld2_grec)) {
1551                         if (truncate && !first)
1552                                 break;   /* truncate these */
1553                         if (pgr)
1554                                 pgr->grec_nsrcs = htons(scount);
1555                         if (skb)
1556                                 mld_sendpack(skb);
1557                         skb = mld_newpack(idev, dev->mtu);
1558                         first = 1;
1559                         scount = 0;
1560                 }
1561                 if (first) {
1562                         skb = add_grhead(skb, pmc, type, &pgr);
1563                         first = 0;
1564                 }
1565                 if (!skb)
1566                         return NULL;
1567                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1568                 *psrc = psf->sf_addr;
1569                 scount++; stotal++;
1570                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1571                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1572                         psf->sf_crcount--;
1573                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1574                                 if (psf_prev)
1575                                         psf_prev->sf_next = psf->sf_next;
1576                                 else
1577                                         *psf_list = psf->sf_next;
1578                                 kfree(psf);
1579                                 continue;
1580                         }
1581                 }
1582                 psf_prev = psf;
1583         }
1584
1585 empty_source:
1586         if (!stotal) {
1587                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1588                     type == MLD2_BLOCK_OLD_SOURCES)
1589                         return skb;
1590                 if (pmc->mca_crcount || isquery) {
1591                         /* make sure we have room for group header */
1592                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1593                                 mld_sendpack(skb);
1594                                 skb = NULL; /* add_grhead will get a new one */
1595                         }
1596                         skb = add_grhead(skb, pmc, type, &pgr);
1597                 }
1598         }
1599         if (pgr)
1600                 pgr->grec_nsrcs = htons(scount);
1601
1602         if (isquery)
1603                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1604         return skb;
1605 }
1606
1607 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1608 {
1609         struct sk_buff *skb = NULL;
1610         int type;
1611
1612         read_lock_bh(&idev->lock);
1613         if (!pmc) {
1614                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1615                         if (pmc->mca_flags & MAF_NOREPORT)
1616                                 continue;
1617                         spin_lock_bh(&pmc->mca_lock);
1618                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1619                                 type = MLD2_MODE_IS_EXCLUDE;
1620                         else
1621                                 type = MLD2_MODE_IS_INCLUDE;
1622                         skb = add_grec(skb, pmc, type, 0, 0);
1623                         spin_unlock_bh(&pmc->mca_lock);
1624                 }
1625         } else {
1626                 spin_lock_bh(&pmc->mca_lock);
1627                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1628                         type = MLD2_MODE_IS_EXCLUDE;
1629                 else
1630                         type = MLD2_MODE_IS_INCLUDE;
1631                 skb = add_grec(skb, pmc, type, 0, 0);
1632                 spin_unlock_bh(&pmc->mca_lock);
1633         }
1634         read_unlock_bh(&idev->lock);
1635         if (skb)
1636                 mld_sendpack(skb);
1637 }
1638
1639 /*
1640  * remove zero-count source records from a source filter list
1641  */
1642 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1643 {
1644         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1645
1646         psf_prev = NULL;
1647         for (psf=*ppsf; psf; psf = psf_next) {
1648                 psf_next = psf->sf_next;
1649                 if (psf->sf_crcount == 0) {
1650                         if (psf_prev)
1651                                 psf_prev->sf_next = psf->sf_next;
1652                         else
1653                                 *ppsf = psf->sf_next;
1654                         kfree(psf);
1655                 } else
1656                         psf_prev = psf;
1657         }
1658 }
1659
1660 static void mld_send_cr(struct inet6_dev *idev)
1661 {
1662         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1663         struct sk_buff *skb = NULL;
1664         int type, dtype;
1665
1666         read_lock_bh(&idev->lock);
1667         spin_lock(&idev->mc_lock);
1668
1669         /* deleted MCA's */
1670         pmc_prev = NULL;
1671         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1672                 pmc_next = pmc->next;
1673                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1674                         type = MLD2_BLOCK_OLD_SOURCES;
1675                         dtype = MLD2_BLOCK_OLD_SOURCES;
1676                         skb = add_grec(skb, pmc, type, 1, 0);
1677                         skb = add_grec(skb, pmc, dtype, 1, 1);
1678                 }
1679                 if (pmc->mca_crcount) {
1680                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1681                                 type = MLD2_CHANGE_TO_INCLUDE;
1682                                 skb = add_grec(skb, pmc, type, 1, 0);
1683                         }
1684                         pmc->mca_crcount--;
1685                         if (pmc->mca_crcount == 0) {
1686                                 mld_clear_zeros(&pmc->mca_tomb);
1687                                 mld_clear_zeros(&pmc->mca_sources);
1688                         }
1689                 }
1690                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1691                     !pmc->mca_sources) {
1692                         if (pmc_prev)
1693                                 pmc_prev->next = pmc_next;
1694                         else
1695                                 idev->mc_tomb = pmc_next;
1696                         in6_dev_put(pmc->idev);
1697                         kfree(pmc);
1698                 } else
1699                         pmc_prev = pmc;
1700         }
1701         spin_unlock(&idev->mc_lock);
1702
1703         /* change recs */
1704         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1705                 spin_lock_bh(&pmc->mca_lock);
1706                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1707                         type = MLD2_BLOCK_OLD_SOURCES;
1708                         dtype = MLD2_ALLOW_NEW_SOURCES;
1709                 } else {
1710                         type = MLD2_ALLOW_NEW_SOURCES;
1711                         dtype = MLD2_BLOCK_OLD_SOURCES;
1712                 }
1713                 skb = add_grec(skb, pmc, type, 0, 0);
1714                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1715
1716                 /* filter mode changes */
1717                 if (pmc->mca_crcount) {
1718                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1719                                 type = MLD2_CHANGE_TO_EXCLUDE;
1720                         else
1721                                 type = MLD2_CHANGE_TO_INCLUDE;
1722                         skb = add_grec(skb, pmc, type, 0, 0);
1723                         pmc->mca_crcount--;
1724                 }
1725                 spin_unlock_bh(&pmc->mca_lock);
1726         }
1727         read_unlock_bh(&idev->lock);
1728         if (!skb)
1729                 return;
1730         (void) mld_sendpack(skb);
1731 }
1732
1733 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1734 {
1735         struct net *net = dev_net(dev);
1736         struct sock *sk = net->ipv6.igmp_sk;
1737         struct inet6_dev *idev;
1738         struct sk_buff *skb;
1739         struct mld_msg *hdr;
1740         const struct in6_addr *snd_addr, *saddr;
1741         struct in6_addr addr_buf;
1742         int hlen = LL_RESERVED_SPACE(dev);
1743         int tlen = dev->needed_tailroom;
1744         int err, len, payload_len, full_len;
1745         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1746                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1747                      IPV6_TLV_PADN, 0 };
1748         struct flowi6 fl6;
1749         struct dst_entry *dst;
1750
1751         if (type == ICMPV6_MGM_REDUCTION)
1752                 snd_addr = &in6addr_linklocal_allrouters;
1753         else
1754                 snd_addr = addr;
1755
1756         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1757         payload_len = len + sizeof(ra);
1758         full_len = sizeof(struct ipv6hdr) + payload_len;
1759
1760         rcu_read_lock();
1761         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1762                       IPSTATS_MIB_OUT, full_len);
1763         rcu_read_unlock();
1764
1765         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1766
1767         if (skb == NULL) {
1768                 rcu_read_lock();
1769                 IP6_INC_STATS(net, __in6_dev_get(dev),
1770                               IPSTATS_MIB_OUTDISCARDS);
1771                 rcu_read_unlock();
1772                 return;
1773         }
1774         skb->priority = TC_PRIO_CONTROL;
1775         skb_reserve(skb, hlen);
1776
1777         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1778                 /* <draft-ietf-magma-mld-source-05.txt>:
1779                  * use unspecified address as the source address
1780                  * when a valid link-local address is not available.
1781                  */
1782                 saddr = &in6addr_any;
1783         } else
1784                 saddr = &addr_buf;
1785
1786         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1787
1788         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1789
1790         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1791         memset(hdr, 0, sizeof(struct mld_msg));
1792         hdr->mld_type = type;
1793         hdr->mld_mca = *addr;
1794
1795         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1796                                          IPPROTO_ICMPV6,
1797                                          csum_partial(hdr, len, 0));
1798
1799         rcu_read_lock();
1800         idev = __in6_dev_get(skb->dev);
1801
1802         icmpv6_flow_init(sk, &fl6, type,
1803                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1804                          skb->dev->ifindex);
1805         dst = icmp6_dst_alloc(skb->dev, &fl6);
1806         if (IS_ERR(dst)) {
1807                 err = PTR_ERR(dst);
1808                 goto err_out;
1809         }
1810
1811         skb_dst_set(skb, dst);
1812         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1813                       dst_output);
1814 out:
1815         if (!err) {
1816                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1817                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1818                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1819         } else
1820                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1821
1822         rcu_read_unlock();
1823         return;
1824
1825 err_out:
1826         kfree_skb(skb);
1827         goto out;
1828 }
1829
1830 static void mld_resend_report(struct inet6_dev *idev)
1831 {
1832         if (MLD_V1_SEEN(idev)) {
1833                 struct ifmcaddr6 *mcaddr;
1834                 read_lock_bh(&idev->lock);
1835                 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1836                         if (!(mcaddr->mca_flags & MAF_NOREPORT))
1837                                 igmp6_send(&mcaddr->mca_addr, idev->dev,
1838                                            ICMPV6_MGM_REPORT);
1839                 }
1840                 read_unlock_bh(&idev->lock);
1841         } else {
1842                 mld_send_report(idev, NULL);
1843         }
1844 }
1845
1846 void ipv6_mc_dad_complete(struct inet6_dev *idev)
1847 {
1848         idev->mc_dad_count = idev->mc_qrv;
1849         if (idev->mc_dad_count) {
1850                 mld_resend_report(idev);
1851                 idev->mc_dad_count--;
1852                 if (idev->mc_dad_count)
1853                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1854         }
1855 }
1856
1857 static void mld_dad_timer_expire(unsigned long data)
1858 {
1859         struct inet6_dev *idev = (struct inet6_dev *)data;
1860
1861         mld_resend_report(idev);
1862         if (idev->mc_dad_count) {
1863                 idev->mc_dad_count--;
1864                 if (idev->mc_dad_count)
1865                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1866         }
1867         __in6_dev_put(idev);
1868 }
1869
1870 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1871         const struct in6_addr *psfsrc)
1872 {
1873         struct ip6_sf_list *psf, *psf_prev;
1874         int rv = 0;
1875
1876         psf_prev = NULL;
1877         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1878                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1879                         break;
1880                 psf_prev = psf;
1881         }
1882         if (!psf || psf->sf_count[sfmode] == 0) {
1883                 /* source filter not found, or count wrong =>  bug */
1884                 return -ESRCH;
1885         }
1886         psf->sf_count[sfmode]--;
1887         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1888                 struct inet6_dev *idev = pmc->idev;
1889
1890                 /* no more filters for this source */
1891                 if (psf_prev)
1892                         psf_prev->sf_next = psf->sf_next;
1893                 else
1894                         pmc->mca_sources = psf->sf_next;
1895                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1896                     !MLD_V1_SEEN(idev)) {
1897                         psf->sf_crcount = idev->mc_qrv;
1898                         psf->sf_next = pmc->mca_tomb;
1899                         pmc->mca_tomb = psf;
1900                         rv = 1;
1901                 } else
1902                         kfree(psf);
1903         }
1904         return rv;
1905 }
1906
1907 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1908                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1909                           int delta)
1910 {
1911         struct ifmcaddr6 *pmc;
1912         int     changerec = 0;
1913         int     i, err;
1914
1915         if (!idev)
1916                 return -ENODEV;
1917         read_lock_bh(&idev->lock);
1918         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1919                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1920                         break;
1921         }
1922         if (!pmc) {
1923                 /* MCA not found?? bug */
1924                 read_unlock_bh(&idev->lock);
1925                 return -ESRCH;
1926         }
1927         spin_lock_bh(&pmc->mca_lock);
1928         sf_markstate(pmc);
1929         if (!delta) {
1930                 if (!pmc->mca_sfcount[sfmode]) {
1931                         spin_unlock_bh(&pmc->mca_lock);
1932                         read_unlock_bh(&idev->lock);
1933                         return -EINVAL;
1934                 }
1935                 pmc->mca_sfcount[sfmode]--;
1936         }
1937         err = 0;
1938         for (i=0; i<sfcount; i++) {
1939                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1940
1941                 changerec |= rv > 0;
1942                 if (!err && rv < 0)
1943                         err = rv;
1944         }
1945         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1946             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1947             pmc->mca_sfcount[MCAST_INCLUDE]) {
1948                 struct ip6_sf_list *psf;
1949
1950                 /* filter mode change */
1951                 pmc->mca_sfmode = MCAST_INCLUDE;
1952                 pmc->mca_crcount = idev->mc_qrv;
1953                 idev->mc_ifc_count = pmc->mca_crcount;
1954                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1955                         psf->sf_crcount = 0;
1956                 mld_ifc_event(pmc->idev);
1957         } else if (sf_setstate(pmc) || changerec)
1958                 mld_ifc_event(pmc->idev);
1959         spin_unlock_bh(&pmc->mca_lock);
1960         read_unlock_bh(&idev->lock);
1961         return err;
1962 }
1963
1964 /*
1965  * Add multicast single-source filter to the interface list
1966  */
1967 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1968         const struct in6_addr *psfsrc)
1969 {
1970         struct ip6_sf_list *psf, *psf_prev;
1971
1972         psf_prev = NULL;
1973         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1974                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1975                         break;
1976                 psf_prev = psf;
1977         }
1978         if (!psf) {
1979                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1980                 if (!psf)
1981                         return -ENOBUFS;
1982
1983                 psf->sf_addr = *psfsrc;
1984                 if (psf_prev) {
1985                         psf_prev->sf_next = psf;
1986                 } else
1987                         pmc->mca_sources = psf;
1988         }
1989         psf->sf_count[sfmode]++;
1990         return 0;
1991 }
1992
1993 static void sf_markstate(struct ifmcaddr6 *pmc)
1994 {
1995         struct ip6_sf_list *psf;
1996         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1997
1998         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1999                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2000                         psf->sf_oldin = mca_xcount ==
2001                                 psf->sf_count[MCAST_EXCLUDE] &&
2002                                 !psf->sf_count[MCAST_INCLUDE];
2003                 } else
2004                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2005 }
2006
2007 static int sf_setstate(struct ifmcaddr6 *pmc)
2008 {
2009         struct ip6_sf_list *psf, *dpsf;
2010         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2011         int qrv = pmc->idev->mc_qrv;
2012         int new_in, rv;
2013
2014         rv = 0;
2015         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2016                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2017                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2018                                 !psf->sf_count[MCAST_INCLUDE];
2019                 } else
2020                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2021                 if (new_in) {
2022                         if (!psf->sf_oldin) {
2023                                 struct ip6_sf_list *prev = NULL;
2024
2025                                 for (dpsf=pmc->mca_tomb; dpsf;
2026                                      dpsf=dpsf->sf_next) {
2027                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2028                                             &psf->sf_addr))
2029                                                 break;
2030                                         prev = dpsf;
2031                                 }
2032                                 if (dpsf) {
2033                                         if (prev)
2034                                                 prev->sf_next = dpsf->sf_next;
2035                                         else
2036                                                 pmc->mca_tomb = dpsf->sf_next;
2037                                         kfree(dpsf);
2038                                 }
2039                                 psf->sf_crcount = qrv;
2040                                 rv++;
2041                         }
2042                 } else if (psf->sf_oldin) {
2043                         psf->sf_crcount = 0;
2044                         /*
2045                          * add or update "delete" records if an active filter
2046                          * is now inactive
2047                          */
2048                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2049                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2050                                     &psf->sf_addr))
2051                                         break;
2052                         if (!dpsf) {
2053                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2054                                 if (!dpsf)
2055                                         continue;
2056                                 *dpsf = *psf;
2057                                 /* pmc->mca_lock held by callers */
2058                                 dpsf->sf_next = pmc->mca_tomb;
2059                                 pmc->mca_tomb = dpsf;
2060                         }
2061                         dpsf->sf_crcount = qrv;
2062                         rv++;
2063                 }
2064         }
2065         return rv;
2066 }
2067
2068 /*
2069  * Add multicast source filter list to the interface list
2070  */
2071 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2072                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2073                           int delta)
2074 {
2075         struct ifmcaddr6 *pmc;
2076         int     isexclude;
2077         int     i, err;
2078
2079         if (!idev)
2080                 return -ENODEV;
2081         read_lock_bh(&idev->lock);
2082         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2083                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2084                         break;
2085         }
2086         if (!pmc) {
2087                 /* MCA not found?? bug */
2088                 read_unlock_bh(&idev->lock);
2089                 return -ESRCH;
2090         }
2091         spin_lock_bh(&pmc->mca_lock);
2092
2093         sf_markstate(pmc);
2094         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2095         if (!delta)
2096                 pmc->mca_sfcount[sfmode]++;
2097         err = 0;
2098         for (i=0; i<sfcount; i++) {
2099                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2100                 if (err)
2101                         break;
2102         }
2103         if (err) {
2104                 int j;
2105
2106                 if (!delta)
2107                         pmc->mca_sfcount[sfmode]--;
2108                 for (j=0; j<i; j++)
2109                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2110         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2111                 struct ip6_sf_list *psf;
2112
2113                 /* filter mode change */
2114                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2115                         pmc->mca_sfmode = MCAST_EXCLUDE;
2116                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2117                         pmc->mca_sfmode = MCAST_INCLUDE;
2118                 /* else no filters; keep old mode for reports */
2119
2120                 pmc->mca_crcount = idev->mc_qrv;
2121                 idev->mc_ifc_count = pmc->mca_crcount;
2122                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2123                         psf->sf_crcount = 0;
2124                 mld_ifc_event(idev);
2125         } else if (sf_setstate(pmc))
2126                 mld_ifc_event(idev);
2127         spin_unlock_bh(&pmc->mca_lock);
2128         read_unlock_bh(&idev->lock);
2129         return err;
2130 }
2131
2132 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2133 {
2134         struct ip6_sf_list *psf, *nextpsf;
2135
2136         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2137                 nextpsf = psf->sf_next;
2138                 kfree(psf);
2139         }
2140         pmc->mca_tomb = NULL;
2141         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2142                 nextpsf = psf->sf_next;
2143                 kfree(psf);
2144         }
2145         pmc->mca_sources = NULL;
2146         pmc->mca_sfmode = MCAST_EXCLUDE;
2147         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2148         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2149 }
2150
2151
2152 static void igmp6_join_group(struct ifmcaddr6 *ma)
2153 {
2154         unsigned long delay;
2155
2156         if (ma->mca_flags & MAF_NOREPORT)
2157                 return;
2158
2159         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2160
2161         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2162
2163         spin_lock_bh(&ma->mca_lock);
2164         if (del_timer(&ma->mca_timer)) {
2165                 atomic_dec(&ma->mca_refcnt);
2166                 delay = ma->mca_timer.expires - jiffies;
2167         }
2168
2169         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2170                 atomic_inc(&ma->mca_refcnt);
2171         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2172         spin_unlock_bh(&ma->mca_lock);
2173 }
2174
2175 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2176                             struct inet6_dev *idev)
2177 {
2178         int err;
2179
2180         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2181          * so no other readers or writers of iml or its sflist
2182          */
2183         if (!iml->sflist) {
2184                 /* any-source empty exclude case */
2185                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2186         }
2187         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2188                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2189         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2190         iml->sflist = NULL;
2191         return err;
2192 }
2193
2194 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2195 {
2196         if (MLD_V1_SEEN(ma->idev)) {
2197                 if (ma->mca_flags & MAF_LAST_REPORTER)
2198                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2199                                 ICMPV6_MGM_REDUCTION);
2200         } else {
2201                 mld_add_delrec(ma->idev, ma);
2202                 mld_ifc_event(ma->idev);
2203         }
2204 }
2205
2206 static void mld_gq_timer_expire(unsigned long data)
2207 {
2208         struct inet6_dev *idev = (struct inet6_dev *)data;
2209
2210         idev->mc_gq_running = 0;
2211         mld_send_report(idev, NULL);
2212         __in6_dev_put(idev);
2213 }
2214
2215 static void mld_ifc_timer_expire(unsigned long data)
2216 {
2217         struct inet6_dev *idev = (struct inet6_dev *)data;
2218
2219         mld_send_cr(idev);
2220         if (idev->mc_ifc_count) {
2221                 idev->mc_ifc_count--;
2222                 if (idev->mc_ifc_count)
2223                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2224         }
2225         __in6_dev_put(idev);
2226 }
2227
2228 static void mld_ifc_event(struct inet6_dev *idev)
2229 {
2230         if (MLD_V1_SEEN(idev))
2231                 return;
2232         idev->mc_ifc_count = idev->mc_qrv;
2233         mld_ifc_start_timer(idev, 1);
2234 }
2235
2236
2237 static void igmp6_timer_handler(unsigned long data)
2238 {
2239         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2240
2241         if (MLD_V1_SEEN(ma->idev))
2242                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2243         else
2244                 mld_send_report(ma->idev, ma);
2245
2246         spin_lock(&ma->mca_lock);
2247         ma->mca_flags |=  MAF_LAST_REPORTER;
2248         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2249         spin_unlock(&ma->mca_lock);
2250         ma_put(ma);
2251 }
2252
2253 /* Device changing type */
2254
2255 void ipv6_mc_unmap(struct inet6_dev *idev)
2256 {
2257         struct ifmcaddr6 *i;
2258
2259         /* Install multicast list, except for all-nodes (already installed) */
2260
2261         read_lock_bh(&idev->lock);
2262         for (i = idev->mc_list; i; i = i->next)
2263                 igmp6_group_dropped(i);
2264         read_unlock_bh(&idev->lock);
2265 }
2266
2267 void ipv6_mc_remap(struct inet6_dev *idev)
2268 {
2269         ipv6_mc_up(idev);
2270 }
2271
2272 /* Device going down */
2273
2274 void ipv6_mc_down(struct inet6_dev *idev)
2275 {
2276         struct ifmcaddr6 *i;
2277
2278         /* Withdraw multicast list */
2279
2280         read_lock_bh(&idev->lock);
2281         idev->mc_ifc_count = 0;
2282         if (del_timer(&idev->mc_ifc_timer))
2283                 __in6_dev_put(idev);
2284         idev->mc_gq_running = 0;
2285         if (del_timer(&idev->mc_gq_timer))
2286                 __in6_dev_put(idev);
2287         if (del_timer(&idev->mc_dad_timer))
2288                 __in6_dev_put(idev);
2289
2290         for (i = idev->mc_list; i; i=i->next)
2291                 igmp6_group_dropped(i);
2292         read_unlock_bh(&idev->lock);
2293
2294         mld_clear_delrec(idev);
2295 }
2296
2297
2298 /* Device going up */
2299
2300 void ipv6_mc_up(struct inet6_dev *idev)
2301 {
2302         struct ifmcaddr6 *i;
2303
2304         /* Install multicast list, except for all-nodes (already installed) */
2305
2306         read_lock_bh(&idev->lock);
2307         for (i = idev->mc_list; i; i=i->next)
2308                 igmp6_group_added(i);
2309         read_unlock_bh(&idev->lock);
2310 }
2311
2312 /* IPv6 device initialization. */
2313
2314 void ipv6_mc_init_dev(struct inet6_dev *idev)
2315 {
2316         write_lock_bh(&idev->lock);
2317         spin_lock_init(&idev->mc_lock);
2318         idev->mc_gq_running = 0;
2319         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2320                         (unsigned long)idev);
2321         idev->mc_tomb = NULL;
2322         idev->mc_ifc_count = 0;
2323         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2324                         (unsigned long)idev);
2325         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2326                     (unsigned long)idev);
2327         idev->mc_qrv = MLD_QRV_DEFAULT;
2328         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2329         idev->mc_v1_seen = 0;
2330         write_unlock_bh(&idev->lock);
2331 }
2332
2333 /*
2334  *      Device is about to be destroyed: clean up.
2335  */
2336
2337 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2338 {
2339         struct ifmcaddr6 *i;
2340
2341         /* Deactivate timers */
2342         ipv6_mc_down(idev);
2343
2344         /* Delete all-nodes address. */
2345         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2346          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2347          * fail.
2348          */
2349         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2350
2351         if (idev->cnf.forwarding)
2352                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2353
2354         write_lock_bh(&idev->lock);
2355         while ((i = idev->mc_list) != NULL) {
2356                 idev->mc_list = i->next;
2357                 write_unlock_bh(&idev->lock);
2358
2359                 igmp6_group_dropped(i);
2360                 ma_put(i);
2361
2362                 write_lock_bh(&idev->lock);
2363         }
2364         write_unlock_bh(&idev->lock);
2365 }
2366
2367 #ifdef CONFIG_PROC_FS
2368 struct igmp6_mc_iter_state {
2369         struct seq_net_private p;
2370         struct net_device *dev;
2371         struct inet6_dev *idev;
2372 };
2373
2374 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2375
2376 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2377 {
2378         struct ifmcaddr6 *im = NULL;
2379         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2380         struct net *net = seq_file_net(seq);
2381
2382         state->idev = NULL;
2383         for_each_netdev_rcu(net, state->dev) {
2384                 struct inet6_dev *idev;
2385                 idev = __in6_dev_get(state->dev);
2386                 if (!idev)
2387                         continue;
2388                 read_lock_bh(&idev->lock);
2389                 im = idev->mc_list;
2390                 if (im) {
2391                         state->idev = idev;
2392                         break;
2393                 }
2394                 read_unlock_bh(&idev->lock);
2395         }
2396         return im;
2397 }
2398
2399 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2400 {
2401         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2402
2403         im = im->next;
2404         while (!im) {
2405                 if (likely(state->idev != NULL))
2406                         read_unlock_bh(&state->idev->lock);
2407
2408                 state->dev = next_net_device_rcu(state->dev);
2409                 if (!state->dev) {
2410                         state->idev = NULL;
2411                         break;
2412                 }
2413                 state->idev = __in6_dev_get(state->dev);
2414                 if (!state->idev)
2415                         continue;
2416                 read_lock_bh(&state->idev->lock);
2417                 im = state->idev->mc_list;
2418         }
2419         return im;
2420 }
2421
2422 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2423 {
2424         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2425         if (im)
2426                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2427                         --pos;
2428         return pos ? NULL : im;
2429 }
2430
2431 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2432         __acquires(RCU)
2433 {
2434         rcu_read_lock();
2435         return igmp6_mc_get_idx(seq, *pos);
2436 }
2437
2438 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2439 {
2440         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2441
2442         ++*pos;
2443         return im;
2444 }
2445
2446 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2447         __releases(RCU)
2448 {
2449         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2450
2451         if (likely(state->idev != NULL)) {
2452                 read_unlock_bh(&state->idev->lock);
2453                 state->idev = NULL;
2454         }
2455         state->dev = NULL;
2456         rcu_read_unlock();
2457 }
2458
2459 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2460 {
2461         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2462         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2463
2464         seq_printf(seq,
2465                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2466                    state->dev->ifindex, state->dev->name,
2467                    &im->mca_addr,
2468                    im->mca_users, im->mca_flags,
2469                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2470                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2471         return 0;
2472 }
2473
2474 static const struct seq_operations igmp6_mc_seq_ops = {
2475         .start  =       igmp6_mc_seq_start,
2476         .next   =       igmp6_mc_seq_next,
2477         .stop   =       igmp6_mc_seq_stop,
2478         .show   =       igmp6_mc_seq_show,
2479 };
2480
2481 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2482 {
2483         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2484                             sizeof(struct igmp6_mc_iter_state));
2485 }
2486
2487 static const struct file_operations igmp6_mc_seq_fops = {
2488         .owner          =       THIS_MODULE,
2489         .open           =       igmp6_mc_seq_open,
2490         .read           =       seq_read,
2491         .llseek         =       seq_lseek,
2492         .release        =       seq_release_net,
2493 };
2494
2495 struct igmp6_mcf_iter_state {
2496         struct seq_net_private p;
2497         struct net_device *dev;
2498         struct inet6_dev *idev;
2499         struct ifmcaddr6 *im;
2500 };
2501
2502 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2503
2504 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2505 {
2506         struct ip6_sf_list *psf = NULL;
2507         struct ifmcaddr6 *im = NULL;
2508         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2509         struct net *net = seq_file_net(seq);
2510
2511         state->idev = NULL;
2512         state->im = NULL;
2513         for_each_netdev_rcu(net, state->dev) {
2514                 struct inet6_dev *idev;
2515                 idev = __in6_dev_get(state->dev);
2516                 if (unlikely(idev == NULL))
2517                         continue;
2518                 read_lock_bh(&idev->lock);
2519                 im = idev->mc_list;
2520                 if (likely(im != NULL)) {
2521                         spin_lock_bh(&im->mca_lock);
2522                         psf = im->mca_sources;
2523                         if (likely(psf != NULL)) {
2524                                 state->im = im;
2525                                 state->idev = idev;
2526                                 break;
2527                         }
2528                         spin_unlock_bh(&im->mca_lock);
2529                 }
2530                 read_unlock_bh(&idev->lock);
2531         }
2532         return psf;
2533 }
2534
2535 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2536 {
2537         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2538
2539         psf = psf->sf_next;
2540         while (!psf) {
2541                 spin_unlock_bh(&state->im->mca_lock);
2542                 state->im = state->im->next;
2543                 while (!state->im) {
2544                         if (likely(state->idev != NULL))
2545                                 read_unlock_bh(&state->idev->lock);
2546
2547                         state->dev = next_net_device_rcu(state->dev);
2548                         if (!state->dev) {
2549                                 state->idev = NULL;
2550                                 goto out;
2551                         }
2552                         state->idev = __in6_dev_get(state->dev);
2553                         if (!state->idev)
2554                                 continue;
2555                         read_lock_bh(&state->idev->lock);
2556                         state->im = state->idev->mc_list;
2557                 }
2558                 if (!state->im)
2559                         break;
2560                 spin_lock_bh(&state->im->mca_lock);
2561                 psf = state->im->mca_sources;
2562         }
2563 out:
2564         return psf;
2565 }
2566
2567 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2568 {
2569         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2570         if (psf)
2571                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2572                         --pos;
2573         return pos ? NULL : psf;
2574 }
2575
2576 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2577         __acquires(RCU)
2578 {
2579         rcu_read_lock();
2580         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2581 }
2582
2583 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2584 {
2585         struct ip6_sf_list *psf;
2586         if (v == SEQ_START_TOKEN)
2587                 psf = igmp6_mcf_get_first(seq);
2588         else
2589                 psf = igmp6_mcf_get_next(seq, v);
2590         ++*pos;
2591         return psf;
2592 }
2593
2594 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2595         __releases(RCU)
2596 {
2597         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2598         if (likely(state->im != NULL)) {
2599                 spin_unlock_bh(&state->im->mca_lock);
2600                 state->im = NULL;
2601         }
2602         if (likely(state->idev != NULL)) {
2603                 read_unlock_bh(&state->idev->lock);
2604                 state->idev = NULL;
2605         }
2606         state->dev = NULL;
2607         rcu_read_unlock();
2608 }
2609
2610 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2611 {
2612         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2613         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2614
2615         if (v == SEQ_START_TOKEN) {
2616                 seq_printf(seq,
2617                            "%3s %6s "
2618                            "%32s %32s %6s %6s\n", "Idx",
2619                            "Device", "Multicast Address",
2620                            "Source Address", "INC", "EXC");
2621         } else {
2622                 seq_printf(seq,
2623                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2624                            state->dev->ifindex, state->dev->name,
2625                            &state->im->mca_addr,
2626                            &psf->sf_addr,
2627                            psf->sf_count[MCAST_INCLUDE],
2628                            psf->sf_count[MCAST_EXCLUDE]);
2629         }
2630         return 0;
2631 }
2632
2633 static const struct seq_operations igmp6_mcf_seq_ops = {
2634         .start  =       igmp6_mcf_seq_start,
2635         .next   =       igmp6_mcf_seq_next,
2636         .stop   =       igmp6_mcf_seq_stop,
2637         .show   =       igmp6_mcf_seq_show,
2638 };
2639
2640 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2641 {
2642         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2643                             sizeof(struct igmp6_mcf_iter_state));
2644 }
2645
2646 static const struct file_operations igmp6_mcf_seq_fops = {
2647         .owner          =       THIS_MODULE,
2648         .open           =       igmp6_mcf_seq_open,
2649         .read           =       seq_read,
2650         .llseek         =       seq_lseek,
2651         .release        =       seq_release_net,
2652 };
2653
2654 static int __net_init igmp6_proc_init(struct net *net)
2655 {
2656         int err;
2657
2658         err = -ENOMEM;
2659         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2660                 goto out;
2661         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2662                          &igmp6_mcf_seq_fops))
2663                 goto out_proc_net_igmp6;
2664
2665         err = 0;
2666 out:
2667         return err;
2668
2669 out_proc_net_igmp6:
2670         remove_proc_entry("igmp6", net->proc_net);
2671         goto out;
2672 }
2673
2674 static void __net_exit igmp6_proc_exit(struct net *net)
2675 {
2676         remove_proc_entry("mcfilter6", net->proc_net);
2677         remove_proc_entry("igmp6", net->proc_net);
2678 }
2679 #else
2680 static inline int igmp6_proc_init(struct net *net)
2681 {
2682         return 0;
2683 }
2684 static inline void igmp6_proc_exit(struct net *net)
2685 {
2686 }
2687 #endif
2688
2689 static int __net_init igmp6_net_init(struct net *net)
2690 {
2691         int err;
2692
2693         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2694                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2695         if (err < 0) {
2696                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2697                        err);
2698                 goto out;
2699         }
2700
2701         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2702
2703         err = igmp6_proc_init(net);
2704         if (err)
2705                 goto out_sock_create;
2706 out:
2707         return err;
2708
2709 out_sock_create:
2710         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2711         goto out;
2712 }
2713
2714 static void __net_exit igmp6_net_exit(struct net *net)
2715 {
2716         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2717         igmp6_proc_exit(net);
2718 }
2719
2720 static struct pernet_operations igmp6_net_ops = {
2721         .init = igmp6_net_init,
2722         .exit = igmp6_net_exit,
2723 };
2724
2725 int __init igmp6_init(void)
2726 {
2727         return register_pernet_subsys(&igmp6_net_ops);
2728 }
2729
2730 void igmp6_cleanup(void)
2731 {
2732         unregister_pernet_subsys(&igmp6_net_ops);
2733 }