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 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  68 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  69         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  70         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  71         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  72 };
  73
  74 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  75
  76 static void igmp6_join_group(struct ifmcaddr6 *ma);
  77 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  78 static void igmp6_timer_handler(unsigned long data);
  79
  80 static void mld_gq_timer_expire(unsigned long data);
  81 static void mld_ifc_timer_expire(unsigned long data);
  82 static void mld_ifc_event(struct inet6_dev *idev);
  83 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  84 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  85 static void mld_clear_delrec(struct inet6_dev *idev);
  86 static bool mld_in_v1_mode(const struct inet6_dev *idev);
  87 static int sf_setstate(struct ifmcaddr6 *pmc);
  88 static void sf_markstate(struct ifmcaddr6 *pmc);
  89 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
  90 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  91                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
  92                           int delta);
  93 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  94                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
  95                           int delta);
  96 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
  97                             struct inet6_dev *idev);
  98
  99 #define MLD_QRV_DEFAULT         2
 100 /* RFC3810, 9.2. Query Interval */
 101 #define MLD_QI_DEFAULT          (125 * HZ)
 102 /* RFC3810, 9.3. Query Response Interval */
 103 #define MLD_QRI_DEFAULT         (10 * HZ)
 104
 105 /* RFC3810, 8.1 Query Version Distinctions */
 106 #define MLD_V1_QUERY_LEN        24
 107 #define MLD_V2_QUERY_LEN_MIN    28
 108
 109 #define IPV6_MLD_MAX_MSF        64
 110
 111 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 112 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
 113
 114 /*
 115  *      socket join on multicast group
 116  */
 117
 118 #define for_each_pmc_rcu(np, pmc)                               \
 119         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 120              pmc != NULL;                                       \
 121              pmc = rcu_dereference(pmc->next))
 122
 123 static int unsolicited_report_interval(struct inet6_dev *idev)
 124 {
 125         int iv;
 126
 127         if (mld_in_v1_mode(idev))
 128                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 129         else
 130                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 131
 132         return iv > 0 ? iv : 1;
 133 }
 134
 135 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 136 {
 137         struct net_device *dev = NULL;
 138         struct ipv6_mc_socklist *mc_lst;
 139         struct ipv6_pinfo *np = inet6_sk(sk);
 140         struct net *net = sock_net(sk);
 141         int err;
 142
 143         ASSERT_RTNL();
 144
 145         if (!ipv6_addr_is_multicast(addr))
 146                 return -EINVAL;
 147
 148         rcu_read_lock();
 149         for_each_pmc_rcu(np, mc_lst) {
 150                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 151                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 152                         rcu_read_unlock();
 153                         return -EADDRINUSE;
 154                 }
 155         }
 156         rcu_read_unlock();
 157
 158         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 159
 160         if (!mc_lst)
 161                 return -ENOMEM;
 162
 163         mc_lst->next = NULL;
 164         mc_lst->addr = *addr;
 165
 166         if (ifindex == 0) {
 167                 struct rt6_info *rt;
 168                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 169                 if (rt) {
 170                         dev = rt->dst.dev;
 171                         ip6_rt_put(rt);
 172                 }
 173         } else
 174                 dev = __dev_get_by_index(net, ifindex);
 175
 176         if (!dev) {
 177                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 178                 return -ENODEV;
 179         }
 180
 181         mc_lst->ifindex = dev->ifindex;
 182         mc_lst->sfmode = MCAST_EXCLUDE;
 183         rwlock_init(&mc_lst->sflock);
 184         mc_lst->sflist = NULL;
 185
 186         /*
 187          *      now add/increase the group membership on the device
 188          */
 189
 190         err = ipv6_dev_mc_inc(dev, addr);
 191
 192         if (err) {
 193                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 194                 return err;
 195         }
 196
 197         mc_lst->next = np->ipv6_mc_list;
 198         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 199
 200         return 0;
 201 }
 202 EXPORT_SYMBOL(ipv6_sock_mc_join);
 203
 204 /*
 205  *      socket leave on multicast group
 206  */
 207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 208 {
 209         struct ipv6_pinfo *np = inet6_sk(sk);
 210         struct ipv6_mc_socklist *mc_lst;
 211         struct ipv6_mc_socklist __rcu **lnk;
 212         struct net *net = sock_net(sk);
 213
 214         ASSERT_RTNL();
 215
 216         if (!ipv6_addr_is_multicast(addr))
 217                 return -EINVAL;
 218
 219         for (lnk = &np->ipv6_mc_list;
 220              (mc_lst = rtnl_dereference(*lnk)) != NULL;
 221               lnk = &mc_lst->next) {
 222                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 223                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 224                         struct net_device *dev;
 225
 226                         *lnk = mc_lst->next;
 227
 228                         dev = __dev_get_by_index(net, mc_lst->ifindex);
 229                         if (dev) {
 230                                 struct inet6_dev *idev = __in6_dev_get(dev);
 231
 232                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 233                                 if (idev)
 234                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 235                         } else
 236                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 237
 238                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 239                         kfree_rcu(mc_lst, rcu);
 240                         return 0;
 241                 }
 242         }
 243
 244         return -EADDRNOTAVAIL;
 245 }
 246 EXPORT_SYMBOL(ipv6_sock_mc_drop);
 247
 248 /* called with rcu_read_lock() */
 249 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 250                                              const struct in6_addr *group,
 251                                              int ifindex)
 252 {
 253         struct net_device *dev = NULL;
 254         struct inet6_dev *idev = NULL;
 255
 256         if (ifindex == 0) {
 257                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 258
 259                 if (rt) {
 260                         dev = rt->dst.dev;
 261                         ip6_rt_put(rt);
 262                 }
 263         } else
 264                 dev = dev_get_by_index_rcu(net, ifindex);
 265
 266         if (!dev)
 267                 return NULL;
 268         idev = __in6_dev_get(dev);
 269         if (!idev)
 270                 return NULL;
 271         read_lock_bh(&idev->lock);
 272         if (idev->dead) {
 273                 read_unlock_bh(&idev->lock);
 274                 return NULL;
 275         }
 276         return idev;
 277 }
 278
 279 void ipv6_sock_mc_close(struct sock *sk)
 280 {
 281         struct ipv6_pinfo *np = inet6_sk(sk);
 282         struct ipv6_mc_socklist *mc_lst;
 283         struct net *net = sock_net(sk);
 284
 285         if (!rcu_access_pointer(np->ipv6_mc_list))
 286                 return;
 287
 288         rtnl_lock();
 289         while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
 290                 struct net_device *dev;
 291
 292                 np->ipv6_mc_list = mc_lst->next;
 293
 294                 dev = __dev_get_by_index(net, mc_lst->ifindex);
 295                 if (dev) {
 296                         struct inet6_dev *idev = __in6_dev_get(dev);
 297
 298                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 299                         if (idev)
 300                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 301                 } else
 302                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 303
 304                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 305                 kfree_rcu(mc_lst, rcu);
 306
 307         }
 308         rtnl_unlock();
 309 }
 310
 311 int ip6_mc_source(int add, int omode, struct sock *sk,
 312         struct group_source_req *pgsr)
 313 {
 314         struct in6_addr *source, *group;
 315         struct ipv6_mc_socklist *pmc;
 316         struct inet6_dev *idev;
 317         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 318         struct ip6_sf_socklist *psl;
 319         struct net *net = sock_net(sk);
 320         int i, j, rv;
 321         int leavegroup = 0;
 322         int pmclocked = 0;
 323         int err;
 324
 325         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 326         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 327
 328         if (!ipv6_addr_is_multicast(group))
 329                 return -EINVAL;
 330
 331         rcu_read_lock();
 332         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 333         if (!idev) {
 334                 rcu_read_unlock();
 335                 return -ENODEV;
 336         }
 337
 338         err = -EADDRNOTAVAIL;
 339
 340         for_each_pmc_rcu(inet6, pmc) {
 341                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 342                         continue;
 343                 if (ipv6_addr_equal(&pmc->addr, group))
 344                         break;
 345         }
 346         if (!pmc) {             /* must have a prior join */
 347                 err = -EINVAL;
 348                 goto done;
 349         }
 350         /* if a source filter was set, must be the same mode as before */
 351         if (pmc->sflist) {
 352                 if (pmc->sfmode != omode) {
 353                         err = -EINVAL;
 354                         goto done;
 355                 }
 356         } else if (pmc->sfmode != omode) {
 357                 /* allow mode switches for empty-set filters */
 358                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 359                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 360                 pmc->sfmode = omode;
 361         }
 362
 363         write_lock(&pmc->sflock);
 364         pmclocked = 1;
 365
 366         psl = pmc->sflist;
 367         if (!add) {
 368                 if (!psl)
 369                         goto done;      /* err = -EADDRNOTAVAIL */
 370                 rv = !0;
 371                 for (i = 0; i < psl->sl_count; i++) {
 372                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 373                         if (rv == 0)
 374                                 break;
 375                 }
 376                 if (rv)         /* source not found */
 377                         goto done;      /* err = -EADDRNOTAVAIL */
 378
 379                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 380                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 381                         leavegroup = 1;
 382                         goto done;
 383                 }
 384
 385                 /* update the interface filter */
 386                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 387
 388                 for (j = i+1; j < psl->sl_count; j++)
 389                         psl->sl_addr[j-1] = psl->sl_addr[j];
 390                 psl->sl_count--;
 391                 err = 0;
 392                 goto done;
 393         }
 394         /* else, add a new source to the filter */
 395
 396         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 397                 err = -ENOBUFS;
 398                 goto done;
 399         }
 400         if (!psl || psl->sl_count == psl->sl_max) {
 401                 struct ip6_sf_socklist *newpsl;
 402                 int count = IP6_SFBLOCK;
 403
 404                 if (psl)
 405                         count += psl->sl_max;
 406                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 407                 if (!newpsl) {
 408                         err = -ENOBUFS;
 409                         goto done;
 410                 }
 411                 newpsl->sl_max = count;
 412                 newpsl->sl_count = count - IP6_SFBLOCK;
 413                 if (psl) {
 414                         for (i = 0; i < psl->sl_count; i++)
 415                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 416                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 417                 }
 418                 pmc->sflist = psl = newpsl;
 419         }
 420         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 421         for (i = 0; i < psl->sl_count; i++) {
 422                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 423                 if (rv == 0) /* There is an error in the address. */
 424                         goto done;
 425         }
 426         for (j = psl->sl_count-1; j >= i; j--)
 427                 psl->sl_addr[j+1] = psl->sl_addr[j];
 428         psl->sl_addr[i] = *source;
 429         psl->sl_count++;
 430         err = 0;
 431         /* update the interface list */
 432         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 433 done:
 434         if (pmclocked)
 435                 write_unlock(&pmc->sflock);
 436         read_unlock_bh(&idev->lock);
 437         rcu_read_unlock();
 438         if (leavegroup)
 439                 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 440         return err;
 441 }
 442
 443 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 444 {
 445         const struct in6_addr *group;
 446         struct ipv6_mc_socklist *pmc;
 447         struct inet6_dev *idev;
 448         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 449         struct ip6_sf_socklist *newpsl, *psl;
 450         struct net *net = sock_net(sk);
 451         int leavegroup = 0;
 452         int i, err;
 453
 454         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 455
 456         if (!ipv6_addr_is_multicast(group))
 457                 return -EINVAL;
 458         if (gsf->gf_fmode != MCAST_INCLUDE &&
 459             gsf->gf_fmode != MCAST_EXCLUDE)
 460                 return -EINVAL;
 461
 462         rcu_read_lock();
 463         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 464
 465         if (!idev) {
 466                 rcu_read_unlock();
 467                 return -ENODEV;
 468         }
 469
 470         err = 0;
 471
 472         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 473                 leavegroup = 1;
 474                 goto done;
 475         }
 476
 477         for_each_pmc_rcu(inet6, pmc) {
 478                 if (pmc->ifindex != gsf->gf_interface)
 479                         continue;
 480                 if (ipv6_addr_equal(&pmc->addr, group))
 481                         break;
 482         }
 483         if (!pmc) {             /* must have a prior join */
 484                 err = -EINVAL;
 485                 goto done;
 486         }
 487         if (gsf->gf_numsrc) {
 488                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 489                                                           GFP_ATOMIC);
 490                 if (!newpsl) {
 491                         err = -ENOBUFS;
 492                         goto done;
 493                 }
 494                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 495                 for (i = 0; i < newpsl->sl_count; ++i) {
 496                         struct sockaddr_in6 *psin6;
 497
 498                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 499                         newpsl->sl_addr[i] = psin6->sin6_addr;
 500                 }
 501                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 502                         newpsl->sl_count, newpsl->sl_addr, 0);
 503                 if (err) {
 504                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 505                         goto done;
 506                 }
 507         } else {
 508                 newpsl = NULL;
 509                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 510         }
 511
 512         write_lock(&pmc->sflock);
 513         psl = pmc->sflist;
 514         if (psl) {
 515                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 516                         psl->sl_count, psl->sl_addr, 0);
 517                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 518         } else
 519                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 520         pmc->sflist = newpsl;
 521         pmc->sfmode = gsf->gf_fmode;
 522         write_unlock(&pmc->sflock);
 523         err = 0;
 524 done:
 525         read_unlock_bh(&idev->lock);
 526         rcu_read_unlock();
 527         if (leavegroup)
 528                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 529         return err;
 530 }
 531
 532 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 533         struct group_filter __user *optval, int __user *optlen)
 534 {
 535         int err, i, count, copycount;
 536         const struct in6_addr *group;
 537         struct ipv6_mc_socklist *pmc;
 538         struct inet6_dev *idev;
 539         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 540         struct ip6_sf_socklist *psl;
 541         struct net *net = sock_net(sk);
 542
 543         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 544
 545         if (!ipv6_addr_is_multicast(group))
 546                 return -EINVAL;
 547
 548         rcu_read_lock();
 549         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 550
 551         if (!idev) {
 552                 rcu_read_unlock();
 553                 return -ENODEV;
 554         }
 555
 556         err = -EADDRNOTAVAIL;
 557         /* changes to the ipv6_mc_list require the socket lock and
 558          * rtnl lock. We have the socket lock and rcu read lock,
 559          * so reading the list is safe.
 560          */
 561
 562         for_each_pmc_rcu(inet6, pmc) {
 563                 if (pmc->ifindex != gsf->gf_interface)
 564                         continue;
 565                 if (ipv6_addr_equal(group, &pmc->addr))
 566                         break;
 567         }
 568         if (!pmc)               /* must have a prior join */
 569                 goto done;
 570         gsf->gf_fmode = pmc->sfmode;
 571         psl = pmc->sflist;
 572         count = psl ? psl->sl_count : 0;
 573         read_unlock_bh(&idev->lock);
 574         rcu_read_unlock();
 575
 576         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 577         gsf->gf_numsrc = count;
 578         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 579             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 580                 return -EFAULT;
 581         }
 582         /* changes to psl require the socket lock, and a write lock
 583          * on pmc->sflock. We have the socket lock so reading here is safe.
 584          */
 585         for (i = 0; i < copycount; i++) {
 586                 struct sockaddr_in6 *psin6;
 587                 struct sockaddr_storage ss;
 588
 589                 psin6 = (struct sockaddr_in6 *)&ss;
 590                 memset(&ss, 0, sizeof(ss));
 591                 psin6->sin6_family = AF_INET6;
 592                 psin6->sin6_addr = psl->sl_addr[i];
 593                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 594                         return -EFAULT;
 595         }
 596         return 0;
 597 done:
 598         read_unlock_bh(&idev->lock);
 599         rcu_read_unlock();
 600         return err;
 601 }
 602
 603 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 604                     const struct in6_addr *src_addr)
 605 {
 606         struct ipv6_pinfo *np = inet6_sk(sk);
 607         struct ipv6_mc_socklist *mc;
 608         struct ip6_sf_socklist *psl;
 609         bool rv = true;
 610
 611         rcu_read_lock();
 612         for_each_pmc_rcu(np, mc) {
 613                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 614                         break;
 615         }
 616         if (!mc) {
 617                 rcu_read_unlock();
 618                 return true;
 619         }
 620         read_lock(&mc->sflock);
 621         psl = mc->sflist;
 622         if (!psl) {
 623                 rv = mc->sfmode == MCAST_EXCLUDE;
 624         } else {
 625                 int i;
 626
 627                 for (i = 0; i < psl->sl_count; i++) {
 628                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 629                                 break;
 630                 }
 631                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 632                         rv = false;
 633                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 634                         rv = false;
 635         }
 636         read_unlock(&mc->sflock);
 637         rcu_read_unlock();
 638
 639         return rv;
 640 }
 641
 642 static void igmp6_group_added(struct ifmcaddr6 *mc)
 643 {
 644         struct net_device *dev = mc->idev->dev;
 645         char buf[MAX_ADDR_LEN];
 646
 647         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 648             IPV6_ADDR_SCOPE_LINKLOCAL)
 649                 return;
 650
 651         spin_lock_bh(&mc->mca_lock);
 652         if (!(mc->mca_flags&MAF_LOADED)) {
 653                 mc->mca_flags |= MAF_LOADED;
 654                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 655                         dev_mc_add(dev, buf);
 656         }
 657         spin_unlock_bh(&mc->mca_lock);
 658
 659         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 660                 return;
 661
 662         if (mld_in_v1_mode(mc->idev)) {
 663                 igmp6_join_group(mc);
 664                 return;
 665         }
 666         /* else v2 */
 667
 668         mc->mca_crcount = mc->idev->mc_qrv;
 669         mld_ifc_event(mc->idev);
 670 }
 671
 672 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 673 {
 674         struct net_device *dev = mc->idev->dev;
 675         char buf[MAX_ADDR_LEN];
 676
 677         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 678             IPV6_ADDR_SCOPE_LINKLOCAL)
 679                 return;
 680
 681         spin_lock_bh(&mc->mca_lock);
 682         if (mc->mca_flags&MAF_LOADED) {
 683                 mc->mca_flags &= ~MAF_LOADED;
 684                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 685                         dev_mc_del(dev, buf);
 686         }
 687
 688         if (mc->mca_flags & MAF_NOREPORT)
 689                 goto done;
 690         spin_unlock_bh(&mc->mca_lock);
 691
 692         if (!mc->idev->dead)
 693                 igmp6_leave_group(mc);
 694
 695         spin_lock_bh(&mc->mca_lock);
 696         if (del_timer(&mc->mca_timer))
 697                 atomic_dec(&mc->mca_refcnt);
 698 done:
 699         ip6_mc_clear_src(mc);
 700         spin_unlock_bh(&mc->mca_lock);
 701 }
 702
 703 /*
 704  * deleted ifmcaddr6 manipulation
 705  */
 706 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 707 {
 708         struct ifmcaddr6 *pmc;
 709
 710         /* this is an "ifmcaddr6" for convenience; only the fields below
 711          * are actually used. In particular, the refcnt and users are not
 712          * used for management of the delete list. Using the same structure
 713          * for deleted items allows change reports to use common code with
 714          * non-deleted or query-response MCA's.
 715          */
 716         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 717         if (!pmc)
 718                 return;
 719
 720         spin_lock_bh(&im->mca_lock);
 721         spin_lock_init(&pmc->mca_lock);
 722         pmc->idev = im->idev;
 723         in6_dev_hold(idev);
 724         pmc->mca_addr = im->mca_addr;
 725         pmc->mca_crcount = idev->mc_qrv;
 726         pmc->mca_sfmode = im->mca_sfmode;
 727         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 728                 struct ip6_sf_list *psf;
 729
 730                 pmc->mca_tomb = im->mca_tomb;
 731                 pmc->mca_sources = im->mca_sources;
 732                 im->mca_tomb = im->mca_sources = NULL;
 733                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
 734                         psf->sf_crcount = pmc->mca_crcount;
 735         }
 736         spin_unlock_bh(&im->mca_lock);
 737
 738         spin_lock_bh(&idev->mc_lock);
 739         pmc->next = idev->mc_tomb;
 740         idev->mc_tomb = pmc;
 741         spin_unlock_bh(&idev->mc_lock);
 742 }
 743
 744 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 745 {
 746         struct ifmcaddr6 *pmc, *pmc_prev;
 747         struct ip6_sf_list *psf, *psf_next;
 748
 749         spin_lock_bh(&idev->mc_lock);
 750         pmc_prev = NULL;
 751         for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
 752                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 753                         break;
 754                 pmc_prev = pmc;
 755         }
 756         if (pmc) {
 757                 if (pmc_prev)
 758                         pmc_prev->next = pmc->next;
 759                 else
 760                         idev->mc_tomb = pmc->next;
 761         }
 762         spin_unlock_bh(&idev->mc_lock);
 763
 764         if (pmc) {
 765                 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
 766                         psf_next = psf->sf_next;
 767                         kfree(psf);
 768                 }
 769                 in6_dev_put(pmc->idev);
 770                 kfree(pmc);
 771         }
 772 }
 773
 774 static void mld_clear_delrec(struct inet6_dev *idev)
 775 {
 776         struct ifmcaddr6 *pmc, *nextpmc;
 777
 778         spin_lock_bh(&idev->mc_lock);
 779         pmc = idev->mc_tomb;
 780         idev->mc_tomb = NULL;
 781         spin_unlock_bh(&idev->mc_lock);
 782
 783         for (; pmc; pmc = nextpmc) {
 784                 nextpmc = pmc->next;
 785                 ip6_mc_clear_src(pmc);
 786                 in6_dev_put(pmc->idev);
 787                 kfree(pmc);
 788         }
 789
 790         /* clear dead sources, too */
 791         read_lock_bh(&idev->lock);
 792         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
 793                 struct ip6_sf_list *psf, *psf_next;
 794
 795                 spin_lock_bh(&pmc->mca_lock);
 796                 psf = pmc->mca_tomb;
 797                 pmc->mca_tomb = NULL;
 798                 spin_unlock_bh(&pmc->mca_lock);
 799                 for (; psf; psf = psf_next) {
 800                         psf_next = psf->sf_next;
 801                         kfree(psf);
 802                 }
 803         }
 804         read_unlock_bh(&idev->lock);
 805 }
 806
 807 static void mca_get(struct ifmcaddr6 *mc)
 808 {
 809         atomic_inc(&mc->mca_refcnt);
 810 }
 811
 812 static void ma_put(struct ifmcaddr6 *mc)
 813 {
 814         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 815                 in6_dev_put(mc->idev);
 816                 kfree(mc);
 817         }
 818 }
 819
 820 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
 821                                    const struct in6_addr *addr)
 822 {
 823         struct ifmcaddr6 *mc;
 824
 825         mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
 826         if (!mc)
 827                 return NULL;
 828
 829         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 830
 831         mc->mca_addr = *addr;
 832         mc->idev = idev; /* reference taken by caller */
 833         mc->mca_users = 1;
 834         /* mca_stamp should be updated upon changes */
 835         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 836         atomic_set(&mc->mca_refcnt, 1);
 837         spin_lock_init(&mc->mca_lock);
 838
 839         /* initial mode is (EX, empty) */
 840         mc->mca_sfmode = MCAST_EXCLUDE;
 841         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 842
 843         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 844             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 845                 mc->mca_flags |= MAF_NOREPORT;
 846
 847         return mc;
 848 }
 849
 850 /*
 851  *      device multicast group inc (add if not found)
 852  */
 853 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 854 {
 855         struct ifmcaddr6 *mc;
 856         struct inet6_dev *idev;
 857
 858         ASSERT_RTNL();
 859
 860         /* we need to take a reference on idev */
 861         idev = in6_dev_get(dev);
 862
 863         if (!idev)
 864                 return -EINVAL;
 865
 866         write_lock_bh(&idev->lock);
 867         if (idev->dead) {
 868                 write_unlock_bh(&idev->lock);
 869                 in6_dev_put(idev);
 870                 return -ENODEV;
 871         }
 872
 873         for (mc = idev->mc_list; mc; mc = mc->next) {
 874                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 875                         mc->mca_users++;
 876                         write_unlock_bh(&idev->lock);
 877                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 878                                 NULL, 0);
 879                         in6_dev_put(idev);
 880                         return 0;
 881                 }
 882         }
 883
 884         mc = mca_alloc(idev, addr);
 885         if (!mc) {
 886                 write_unlock_bh(&idev->lock);
 887                 in6_dev_put(idev);
 888                 return -ENOMEM;
 889         }
 890
 891         mc->next = idev->mc_list;
 892         idev->mc_list = mc;
 893
 894         /* Hold this for the code below before we unlock,
 895          * it is already exposed via idev->mc_list.
 896          */
 897         mca_get(mc);
 898         write_unlock_bh(&idev->lock);
 899
 900         mld_del_delrec(idev, &mc->mca_addr);
 901         igmp6_group_added(mc);
 902         ma_put(mc);
 903         return 0;
 904 }
 905
 906 /*
 907  *      device multicast group del
 908  */
 909 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 910 {
 911         struct ifmcaddr6 *ma, **map;
 912
 913         ASSERT_RTNL();
 914
 915         write_lock_bh(&idev->lock);
 916         for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
 917                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 918                         if (--ma->mca_users == 0) {
 919                                 *map = ma->next;
 920                                 write_unlock_bh(&idev->lock);
 921
 922                                 igmp6_group_dropped(ma);
 923
 924                                 ma_put(ma);
 925                                 return 0;
 926                         }
 927                         write_unlock_bh(&idev->lock);
 928                         return 0;
 929                 }
 930         }
 931         write_unlock_bh(&idev->lock);
 932
 933         return -ENOENT;
 934 }
 935
 936 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 937 {
 938         struct inet6_dev *idev;
 939         int err;
 940
 941         ASSERT_RTNL();
 942
 943         idev = __in6_dev_get(dev);
 944         if (!idev)
 945                 err = -ENODEV;
 946         else
 947                 err = __ipv6_dev_mc_dec(idev, addr);
 948
 949         return err;
 950 }
 951
 952 /*
 953  *      check if the interface/address pair is valid
 954  */
 955 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 956                          const struct in6_addr *src_addr)
 957 {
 958         struct inet6_dev *idev;
 959         struct ifmcaddr6 *mc;
 960         bool rv = false;
 961
 962         rcu_read_lock();
 963         idev = __in6_dev_get(dev);
 964         if (idev) {
 965                 read_lock_bh(&idev->lock);
 966                 for (mc = idev->mc_list; mc; mc = mc->next) {
 967                         if (ipv6_addr_equal(&mc->mca_addr, group))
 968                                 break;
 969                 }
 970                 if (mc) {
 971                         if (src_addr && !ipv6_addr_any(src_addr)) {
 972                                 struct ip6_sf_list *psf;
 973
 974                                 spin_lock_bh(&mc->mca_lock);
 975                                 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
 976                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 977                                                 break;
 978                                 }
 979                                 if (psf)
 980                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 981                                                 psf->sf_count[MCAST_EXCLUDE] !=
 982                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 983                                 else
 984                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
 985                                 spin_unlock_bh(&mc->mca_lock);
 986                         } else
 987                                 rv = true; /* don't filter unspecified source */
 988                 }
 989                 read_unlock_bh(&idev->lock);
 990         }
 991         rcu_read_unlock();
 992         return rv;
 993 }
 994
 995 static void mld_gq_start_timer(struct inet6_dev *idev)
 996 {
 997         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
 998
 999         idev->mc_gq_running = 1;
1000         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1001                 in6_dev_hold(idev);
1002 }
1003
1004 static void mld_gq_stop_timer(struct inet6_dev *idev)
1005 {
1006         idev->mc_gq_running = 0;
1007         if (del_timer(&idev->mc_gq_timer))
1008                 __in6_dev_put(idev);
1009 }
1010
1011 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1012 {
1013         unsigned long tv = prandom_u32() % delay;
1014
1015         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1016                 in6_dev_hold(idev);
1017 }
1018
1019 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1020 {
1021         idev->mc_ifc_count = 0;
1022         if (del_timer(&idev->mc_ifc_timer))
1023                 __in6_dev_put(idev);
1024 }
1025
1026 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1027 {
1028         unsigned long tv = prandom_u32() % delay;
1029
1030         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1031                 in6_dev_hold(idev);
1032 }
1033
1034 static void mld_dad_stop_timer(struct inet6_dev *idev)
1035 {
1036         if (del_timer(&idev->mc_dad_timer))
1037                 __in6_dev_put(idev);
1038 }
1039
1040 /*
1041  *      IGMP handling (alias multicast ICMPv6 messages)
1042  */
1043
1044 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1045 {
1046         unsigned long delay = resptime;
1047
1048         /* Do not start timer for these addresses */
1049         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1050             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1051                 return;
1052
1053         if (del_timer(&ma->mca_timer)) {
1054                 atomic_dec(&ma->mca_refcnt);
1055                 delay = ma->mca_timer.expires - jiffies;
1056         }
1057
1058         if (delay >= resptime)
1059                 delay = prandom_u32() % resptime;
1060
1061         ma->mca_timer.expires = jiffies + delay;
1062         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1063                 atomic_inc(&ma->mca_refcnt);
1064         ma->mca_flags |= MAF_TIMER_RUNNING;
1065 }
1066
1067 /* mark EXCLUDE-mode sources */
1068 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1069                              const struct in6_addr *srcs)
1070 {
1071         struct ip6_sf_list *psf;
1072         int i, scount;
1073
1074         scount = 0;
1075         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1076                 if (scount == nsrcs)
1077                         break;
1078                 for (i = 0; i < nsrcs; i++) {
1079                         /* skip inactive filters */
1080                         if (psf->sf_count[MCAST_INCLUDE] ||
1081                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1082                             psf->sf_count[MCAST_EXCLUDE])
1083                                 break;
1084                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1085                                 scount++;
1086                                 break;
1087                         }
1088                 }
1089         }
1090         pmc->mca_flags &= ~MAF_GSQUERY;
1091         if (scount == nsrcs)    /* all sources excluded */
1092                 return false;
1093         return true;
1094 }
1095
1096 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1097                             const struct in6_addr *srcs)
1098 {
1099         struct ip6_sf_list *psf;
1100         int i, scount;
1101
1102         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1103                 return mld_xmarksources(pmc, nsrcs, srcs);
1104
1105         /* mark INCLUDE-mode sources */
1106
1107         scount = 0;
1108         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1109                 if (scount == nsrcs)
1110                         break;
1111                 for (i = 0; i < nsrcs; i++) {
1112                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1113                                 psf->sf_gsresp = 1;
1114                                 scount++;
1115                                 break;
1116                         }
1117                 }
1118         }
1119         if (!scount) {
1120                 pmc->mca_flags &= ~MAF_GSQUERY;
1121                 return false;
1122         }
1123         pmc->mca_flags |= MAF_GSQUERY;
1124         return true;
1125 }
1126
1127 static int mld_force_mld_version(const struct inet6_dev *idev)
1128 {
1129         /* Normally, both are 0 here. If enforcement to a particular is
1130          * being used, individual device enforcement will have a lower
1131          * precedence over 'all' device (.../conf/all/force_mld_version).
1132          */
1133
1134         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1135                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1136         else
1137                 return idev->cnf.force_mld_version;
1138 }
1139
1140 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1141 {
1142         return mld_force_mld_version(idev) == 2;
1143 }
1144
1145 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1146 {
1147         return mld_force_mld_version(idev) == 1;
1148 }
1149
1150 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1151 {
1152         if (mld_in_v2_mode_only(idev))
1153                 return false;
1154         if (mld_in_v1_mode_only(idev))
1155                 return true;
1156         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1157                 return true;
1158
1159         return false;
1160 }
1161
1162 static void mld_set_v1_mode(struct inet6_dev *idev)
1163 {
1164         /* RFC3810, relevant sections:
1165          *  - 9.1. Robustness Variable
1166          *  - 9.2. Query Interval
1167          *  - 9.3. Query Response Interval
1168          *  - 9.12. Older Version Querier Present Timeout
1169          */
1170         unsigned long switchback;
1171
1172         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1173
1174         idev->mc_v1_seen = jiffies + switchback;
1175 }
1176
1177 static void mld_update_qrv(struct inet6_dev *idev,
1178                            const struct mld2_query *mlh2)
1179 {
1180         /* RFC3810, relevant sections:
1181          *  - 5.1.8. QRV (Querier's Robustness Variable)
1182          *  - 9.1. Robustness Variable
1183          */
1184
1185         /* The value of the Robustness Variable MUST NOT be zero,
1186          * and SHOULD NOT be one. Catch this here if we ever run
1187          * into such a case in future.
1188          */
1189         const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1190         WARN_ON(idev->mc_qrv == 0);
1191
1192         if (mlh2->mld2q_qrv > 0)
1193                 idev->mc_qrv = mlh2->mld2q_qrv;
1194
1195         if (unlikely(idev->mc_qrv < min_qrv)) {
1196                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1197                                      idev->mc_qrv, min_qrv);
1198                 idev->mc_qrv = min_qrv;
1199         }
1200 }
1201
1202 static void mld_update_qi(struct inet6_dev *idev,
1203                           const struct mld2_query *mlh2)
1204 {
1205         /* RFC3810, relevant sections:
1206          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1207          *  - 9.2. Query Interval
1208          *  - 9.12. Older Version Querier Present Timeout
1209          *    (the [Query Interval] in the last Query received)
1210          */
1211         unsigned long mc_qqi;
1212
1213         if (mlh2->mld2q_qqic < 128) {
1214                 mc_qqi = mlh2->mld2q_qqic;
1215         } else {
1216                 unsigned long mc_man, mc_exp;
1217
1218                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1219                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1220
1221                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1222         }
1223
1224         idev->mc_qi = mc_qqi * HZ;
1225 }
1226
1227 static void mld_update_qri(struct inet6_dev *idev,
1228                            const struct mld2_query *mlh2)
1229 {
1230         /* RFC3810, relevant sections:
1231          *  - 5.1.3. Maximum Response Code
1232          *  - 9.3. Query Response Interval
1233          */
1234         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1235 }
1236
1237 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1238                           unsigned long *max_delay, bool v1_query)
1239 {
1240         unsigned long mldv1_md;
1241
1242         /* Ignore v1 queries */
1243         if (mld_in_v2_mode_only(idev))
1244                 return -EINVAL;
1245
1246         mldv1_md = ntohs(mld->mld_maxdelay);
1247
1248         /* When in MLDv1 fallback and a MLDv2 router start-up being
1249          * unaware of current MLDv1 operation, the MRC == MRD mapping
1250          * only works when the exponential algorithm is not being
1251          * used (as MLDv1 is unaware of such things).
1252          *
1253          * According to the RFC author, the MLDv2 implementations
1254          * he's aware of all use a MRC < 32768 on start up queries.
1255          *
1256          * Thus, should we *ever* encounter something else larger
1257          * than that, just assume the maximum possible within our
1258          * reach.
1259          */
1260         if (!v1_query)
1261                 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1262
1263         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1264
1265         /* MLDv1 router present: we need to go into v1 mode *only*
1266          * when an MLDv1 query is received as per section 9.12. of
1267          * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1268          * queries MUST be of exactly 24 octets.
1269          */
1270         if (v1_query)
1271                 mld_set_v1_mode(idev);
1272
1273         /* cancel MLDv2 report timer */
1274         mld_gq_stop_timer(idev);
1275         /* cancel the interface change timer */
1276         mld_ifc_stop_timer(idev);
1277         /* clear deleted report items */
1278         mld_clear_delrec(idev);
1279
1280         return 0;
1281 }
1282
1283 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1284                           unsigned long *max_delay)
1285 {
1286         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1287
1288         mld_update_qrv(idev, mld);
1289         mld_update_qi(idev, mld);
1290         mld_update_qri(idev, mld);
1291
1292         idev->mc_maxdelay = *max_delay;
1293
1294         return 0;
1295 }
1296
1297 /* called with rcu_read_lock() */
1298 int igmp6_event_query(struct sk_buff *skb)
1299 {
1300         struct mld2_query *mlh2 = NULL;
1301         struct ifmcaddr6 *ma;
1302         const struct in6_addr *group;
1303         unsigned long max_delay;
1304         struct inet6_dev *idev;
1305         struct mld_msg *mld;
1306         int group_type;
1307         int mark = 0;
1308         int len, err;
1309
1310         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1311                 return -EINVAL;
1312
1313         /* compute payload length excluding extension headers */
1314         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1315         len -= skb_network_header_len(skb);
1316
1317         /* RFC3810 6.2
1318          * Upon reception of an MLD message that contains a Query, the node
1319          * checks if the source address of the message is a valid link-local
1320          * address, if the Hop Limit is set to 1, and if the Router Alert
1321          * option is present in the Hop-By-Hop Options header of the IPv6
1322          * packet.  If any of these checks fails, the packet is dropped.
1323          */
1324         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1325             ipv6_hdr(skb)->hop_limit != 1 ||
1326             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1327             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1328                 return -EINVAL;
1329
1330         idev = __in6_dev_get(skb->dev);
1331         if (!idev)
1332                 return 0;
1333
1334         mld = (struct mld_msg *)icmp6_hdr(skb);
1335         group = &mld->mld_mca;
1336         group_type = ipv6_addr_type(group);
1337
1338         if (group_type != IPV6_ADDR_ANY &&
1339             !(group_type&IPV6_ADDR_MULTICAST))
1340                 return -EINVAL;
1341
1342         if (len < MLD_V1_QUERY_LEN) {
1343                 return -EINVAL;
1344         } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1345                 err = mld_process_v1(idev, mld, &max_delay,
1346                                      len == MLD_V1_QUERY_LEN);
1347                 if (err < 0)
1348                         return err;
1349         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1350                 int srcs_offset = sizeof(struct mld2_query) -
1351                                   sizeof(struct icmp6hdr);
1352
1353                 if (!pskb_may_pull(skb, srcs_offset))
1354                         return -EINVAL;
1355
1356                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1357
1358                 err = mld_process_v2(idev, mlh2, &max_delay);
1359                 if (err < 0)
1360                         return err;
1361
1362                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1363                         if (mlh2->mld2q_nsrcs)
1364                                 return -EINVAL; /* no sources allowed */
1365
1366                         mld_gq_start_timer(idev);
1367                         return 0;
1368                 }
1369                 /* mark sources to include, if group & source-specific */
1370                 if (mlh2->mld2q_nsrcs != 0) {
1371                         if (!pskb_may_pull(skb, srcs_offset +
1372                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1373                                 return -EINVAL;
1374
1375                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1376                         mark = 1;
1377                 }
1378         } else {
1379                 return -EINVAL;
1380         }
1381
1382         read_lock_bh(&idev->lock);
1383         if (group_type == IPV6_ADDR_ANY) {
1384                 for (ma = idev->mc_list; ma; ma = ma->next) {
1385                         spin_lock_bh(&ma->mca_lock);
1386                         igmp6_group_queried(ma, max_delay);
1387                         spin_unlock_bh(&ma->mca_lock);
1388                 }
1389         } else {
1390                 for (ma = idev->mc_list; ma; ma = ma->next) {
1391                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1392                                 continue;
1393                         spin_lock_bh(&ma->mca_lock);
1394                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1395                                 /* gsquery <- gsquery && mark */
1396                                 if (!mark)
1397                                         ma->mca_flags &= ~MAF_GSQUERY;
1398                         } else {
1399                                 /* gsquery <- mark */
1400                                 if (mark)
1401                                         ma->mca_flags |= MAF_GSQUERY;
1402                                 else
1403                                         ma->mca_flags &= ~MAF_GSQUERY;
1404                         }
1405                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1406                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1407                                 igmp6_group_queried(ma, max_delay);
1408                         spin_unlock_bh(&ma->mca_lock);
1409                         break;
1410                 }
1411         }
1412         read_unlock_bh(&idev->lock);
1413
1414         return 0;
1415 }
1416
1417 /* called with rcu_read_lock() */
1418 int igmp6_event_report(struct sk_buff *skb)
1419 {
1420         struct ifmcaddr6 *ma;
1421         struct inet6_dev *idev;
1422         struct mld_msg *mld;
1423         int addr_type;
1424
1425         /* Our own report looped back. Ignore it. */
1426         if (skb->pkt_type == PACKET_LOOPBACK)
1427                 return 0;
1428
1429         /* send our report if the MC router may not have heard this report */
1430         if (skb->pkt_type != PACKET_MULTICAST &&
1431             skb->pkt_type != PACKET_BROADCAST)
1432                 return 0;
1433
1434         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1435                 return -EINVAL;
1436
1437         mld = (struct mld_msg *)icmp6_hdr(skb);
1438
1439         /* Drop reports with not link local source */
1440         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1441         if (addr_type != IPV6_ADDR_ANY &&
1442             !(addr_type&IPV6_ADDR_LINKLOCAL))
1443                 return -EINVAL;
1444
1445         idev = __in6_dev_get(skb->dev);
1446         if (!idev)
1447                 return -ENODEV;
1448
1449         /*
1450          *      Cancel the timer for this group
1451          */
1452
1453         read_lock_bh(&idev->lock);
1454         for (ma = idev->mc_list; ma; ma = ma->next) {
1455                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1456                         spin_lock(&ma->mca_lock);
1457                         if (del_timer(&ma->mca_timer))
1458                                 atomic_dec(&ma->mca_refcnt);
1459                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1460                         spin_unlock(&ma->mca_lock);
1461                         break;
1462                 }
1463         }
1464         read_unlock_bh(&idev->lock);
1465         return 0;
1466 }
1467
1468 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1469                   int gdeleted, int sdeleted)
1470 {
1471         switch (type) {
1472         case MLD2_MODE_IS_INCLUDE:
1473         case MLD2_MODE_IS_EXCLUDE:
1474                 if (gdeleted || sdeleted)
1475                         return false;
1476                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1477                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1478                                 return true;
1479                         /* don't include if this source is excluded
1480                          * in all filters
1481                          */
1482                         if (psf->sf_count[MCAST_INCLUDE])
1483                                 return type == MLD2_MODE_IS_INCLUDE;
1484                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1485                                 psf->sf_count[MCAST_EXCLUDE];
1486                 }
1487                 return false;
1488         case MLD2_CHANGE_TO_INCLUDE:
1489                 if (gdeleted || sdeleted)
1490                         return false;
1491                 return psf->sf_count[MCAST_INCLUDE] != 0;
1492         case MLD2_CHANGE_TO_EXCLUDE:
1493                 if (gdeleted || sdeleted)
1494                         return false;
1495                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1496                     psf->sf_count[MCAST_INCLUDE])
1497                         return false;
1498                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1499                         psf->sf_count[MCAST_EXCLUDE];
1500         case MLD2_ALLOW_NEW_SOURCES:
1501                 if (gdeleted || !psf->sf_crcount)
1502                         return false;
1503                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1504         case MLD2_BLOCK_OLD_SOURCES:
1505                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1506                         return gdeleted || (psf->sf_crcount && sdeleted);
1507                 return psf->sf_crcount && !gdeleted && !sdeleted;
1508         }
1509         return false;
1510 }
1511
1512 static int
1513 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1514 {
1515         struct ip6_sf_list *psf;
1516         int scount = 0;
1517
1518         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1519                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1520                         continue;
1521                 scount++;
1522         }
1523         return scount;
1524 }
1525
1526 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1527                        struct net_device *dev,
1528                        const struct in6_addr *saddr,
1529                        const struct in6_addr *daddr,
1530                        int proto, int len)
1531 {
1532         struct ipv6hdr *hdr;
1533
1534         skb->protocol = htons(ETH_P_IPV6);
1535         skb->dev = dev;
1536
1537         skb_reset_network_header(skb);
1538         skb_put(skb, sizeof(struct ipv6hdr));
1539         hdr = ipv6_hdr(skb);
1540
1541         ip6_flow_hdr(hdr, 0, 0);
1542
1543         hdr->payload_len = htons(len);
1544         hdr->nexthdr = proto;
1545         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1546
1547         hdr->saddr = *saddr;
1548         hdr->daddr = *daddr;
1549 }
1550
1551 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1552 {
1553         struct net_device *dev = idev->dev;
1554         struct net *net = dev_net(dev);
1555         struct sock *sk = net->ipv6.igmp_sk;
1556         struct sk_buff *skb;
1557         struct mld2_report *pmr;
1558         struct in6_addr addr_buf;
1559         const struct in6_addr *saddr;
1560         int hlen = LL_RESERVED_SPACE(dev);
1561         int tlen = dev->needed_tailroom;
1562         unsigned int size = mtu + hlen + tlen;
1563         int err;
1564         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1565                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1566                      IPV6_TLV_PADN, 0 };
1567
1568         /* we assume size > sizeof(ra) here */
1569         /* limit our allocations to order-0 page */
1570         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1571         skb = sock_alloc_send_skb(sk, size, 1, &err);
1572
1573         if (!skb)
1574                 return NULL;
1575
1576         skb->priority = TC_PRIO_CONTROL;
1577         skb->reserved_tailroom = skb_end_offset(skb) -
1578                                  min(mtu, skb_end_offset(skb));
1579         skb_reserve(skb, hlen);
1580
1581         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1582                 /* <draft-ietf-magma-mld-source-05.txt>:
1583                  * use unspecified address as the source address
1584                  * when a valid link-local address is not available.
1585                  */
1586                 saddr = &in6addr_any;
1587         } else
1588                 saddr = &addr_buf;
1589
1590         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1591
1592         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1593
1594         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1595         skb_put(skb, sizeof(*pmr));
1596         pmr = (struct mld2_report *)skb_transport_header(skb);
1597         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1598         pmr->mld2r_resv1 = 0;
1599         pmr->mld2r_cksum = 0;
1600         pmr->mld2r_resv2 = 0;
1601         pmr->mld2r_ngrec = 0;
1602         return skb;
1603 }
1604
1605 static void mld_sendpack(struct sk_buff *skb)
1606 {
1607         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1608         struct mld2_report *pmr =
1609                               (struct mld2_report *)skb_transport_header(skb);
1610         int payload_len, mldlen;
1611         struct inet6_dev *idev;
1612         struct net *net = dev_net(skb->dev);
1613         int err;
1614         struct flowi6 fl6;
1615         struct dst_entry *dst;
1616
1617         rcu_read_lock();
1618         idev = __in6_dev_get(skb->dev);
1619         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1620
1621         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1622                 sizeof(*pip6);
1623         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1624         pip6->payload_len = htons(payload_len);
1625
1626         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1627                                            IPPROTO_ICMPV6,
1628                                            csum_partial(skb_transport_header(skb),
1629                                                         mldlen, 0));
1630
1631         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1632                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1633                          skb->dev->ifindex);
1634         dst = icmp6_dst_alloc(skb->dev, &fl6);
1635
1636         err = 0;
1637         if (IS_ERR(dst)) {
1638                 err = PTR_ERR(dst);
1639                 dst = NULL;
1640         }
1641         skb_dst_set(skb, dst);
1642         if (err)
1643                 goto err_out;
1644
1645         payload_len = skb->len;
1646
1647         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1648                       net->ipv6.igmp_sk, skb, NULL, skb->dev,
1649                       dst_output_sk);
1650 out:
1651         if (!err) {
1652                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1653                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1654                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1655         } else {
1656                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1657         }
1658
1659         rcu_read_unlock();
1660         return;
1661
1662 err_out:
1663         kfree_skb(skb);
1664         goto out;
1665 }
1666
1667 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1668 {
1669         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1670 }
1671
1672 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1673         int type, struct mld2_grec **ppgr)
1674 {
1675         struct net_device *dev = pmc->idev->dev;
1676         struct mld2_report *pmr;
1677         struct mld2_grec *pgr;
1678
1679         if (!skb)
1680                 skb = mld_newpack(pmc->idev, dev->mtu);
1681         if (!skb)
1682                 return NULL;
1683         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1684         pgr->grec_type = type;
1685         pgr->grec_auxwords = 0;
1686         pgr->grec_nsrcs = 0;
1687         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1688         pmr = (struct mld2_report *)skb_transport_header(skb);
1689         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1690         *ppgr = pgr;
1691         return skb;
1692 }
1693
1694 #define AVAILABLE(skb)  ((skb) ? skb_availroom(skb) : 0)
1695
1696 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1697         int type, int gdeleted, int sdeleted, int crsend)
1698 {
1699         struct inet6_dev *idev = pmc->idev;
1700         struct net_device *dev = idev->dev;
1701         struct mld2_report *pmr;
1702         struct mld2_grec *pgr = NULL;
1703         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1704         int scount, stotal, first, isquery, truncate;
1705
1706         if (pmc->mca_flags & MAF_NOREPORT)
1707                 return skb;
1708
1709         isquery = type == MLD2_MODE_IS_INCLUDE ||
1710                   type == MLD2_MODE_IS_EXCLUDE;
1711         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1712                     type == MLD2_CHANGE_TO_EXCLUDE;
1713
1714         stotal = scount = 0;
1715
1716         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1717
1718         if (!*psf_list)
1719                 goto empty_source;
1720
1721         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1722
1723         /* EX and TO_EX get a fresh packet, if needed */
1724         if (truncate) {
1725                 if (pmr && pmr->mld2r_ngrec &&
1726                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1727                         if (skb)
1728                                 mld_sendpack(skb);
1729                         skb = mld_newpack(idev, dev->mtu);
1730                 }
1731         }
1732         first = 1;
1733         psf_prev = NULL;
1734         for (psf = *psf_list; psf; psf = psf_next) {
1735                 struct in6_addr *psrc;
1736
1737                 psf_next = psf->sf_next;
1738
1739                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1740                         psf_prev = psf;
1741                         continue;
1742                 }
1743
1744                 /* clear marks on query responses */
1745                 if (isquery)
1746                         psf->sf_gsresp = 0;
1747
1748                 if (AVAILABLE(skb) < sizeof(*psrc) +
1749                     first*sizeof(struct mld2_grec)) {
1750                         if (truncate && !first)
1751                                 break;   /* truncate these */
1752                         if (pgr)
1753                                 pgr->grec_nsrcs = htons(scount);
1754                         if (skb)
1755                                 mld_sendpack(skb);
1756                         skb = mld_newpack(idev, dev->mtu);
1757                         first = 1;
1758                         scount = 0;
1759                 }
1760                 if (first) {
1761                         skb = add_grhead(skb, pmc, type, &pgr);
1762                         first = 0;
1763                 }
1764                 if (!skb)
1765                         return NULL;
1766                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1767                 *psrc = psf->sf_addr;
1768                 scount++; stotal++;
1769                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1770                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1771                         psf->sf_crcount--;
1772                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1773                                 if (psf_prev)
1774                                         psf_prev->sf_next = psf->sf_next;
1775                                 else
1776                                         *psf_list = psf->sf_next;
1777                                 kfree(psf);
1778                                 continue;
1779                         }
1780                 }
1781                 psf_prev = psf;
1782         }
1783
1784 empty_source:
1785         if (!stotal) {
1786                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1787                     type == MLD2_BLOCK_OLD_SOURCES)
1788                         return skb;
1789                 if (pmc->mca_crcount || isquery || crsend) {
1790                         /* make sure we have room for group header */
1791                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1792                                 mld_sendpack(skb);
1793                                 skb = NULL; /* add_grhead will get a new one */
1794                         }
1795                         skb = add_grhead(skb, pmc, type, &pgr);
1796                 }
1797         }
1798         if (pgr)
1799                 pgr->grec_nsrcs = htons(scount);
1800
1801         if (isquery)
1802                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1803         return skb;
1804 }
1805
1806 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1807 {
1808         struct sk_buff *skb = NULL;
1809         int type;
1810
1811         read_lock_bh(&idev->lock);
1812         if (!pmc) {
1813                 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1814                         if (pmc->mca_flags & MAF_NOREPORT)
1815                                 continue;
1816                         spin_lock_bh(&pmc->mca_lock);
1817                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1818                                 type = MLD2_MODE_IS_EXCLUDE;
1819                         else
1820                                 type = MLD2_MODE_IS_INCLUDE;
1821                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1822                         spin_unlock_bh(&pmc->mca_lock);
1823                 }
1824         } else {
1825                 spin_lock_bh(&pmc->mca_lock);
1826                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1827                         type = MLD2_MODE_IS_EXCLUDE;
1828                 else
1829                         type = MLD2_MODE_IS_INCLUDE;
1830                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1831                 spin_unlock_bh(&pmc->mca_lock);
1832         }
1833         read_unlock_bh(&idev->lock);
1834         if (skb)
1835                 mld_sendpack(skb);
1836 }
1837
1838 /*
1839  * remove zero-count source records from a source filter list
1840  */
1841 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1842 {
1843         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1844
1845         psf_prev = NULL;
1846         for (psf = *ppsf; psf; psf = psf_next) {
1847                 psf_next = psf->sf_next;
1848                 if (psf->sf_crcount == 0) {
1849                         if (psf_prev)
1850                                 psf_prev->sf_next = psf->sf_next;
1851                         else
1852                                 *ppsf = psf->sf_next;
1853                         kfree(psf);
1854                 } else
1855                         psf_prev = psf;
1856         }
1857 }
1858
1859 static void mld_send_cr(struct inet6_dev *idev)
1860 {
1861         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1862         struct sk_buff *skb = NULL;
1863         int type, dtype;
1864
1865         read_lock_bh(&idev->lock);
1866         spin_lock(&idev->mc_lock);
1867
1868         /* deleted MCA's */
1869         pmc_prev = NULL;
1870         for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1871                 pmc_next = pmc->next;
1872                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1873                         type = MLD2_BLOCK_OLD_SOURCES;
1874                         dtype = MLD2_BLOCK_OLD_SOURCES;
1875                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1876                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1877                 }
1878                 if (pmc->mca_crcount) {
1879                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1880                                 type = MLD2_CHANGE_TO_INCLUDE;
1881                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1882                         }
1883                         pmc->mca_crcount--;
1884                         if (pmc->mca_crcount == 0) {
1885                                 mld_clear_zeros(&pmc->mca_tomb);
1886                                 mld_clear_zeros(&pmc->mca_sources);
1887                         }
1888                 }
1889                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1890                     !pmc->mca_sources) {
1891                         if (pmc_prev)
1892                                 pmc_prev->next = pmc_next;
1893                         else
1894                                 idev->mc_tomb = pmc_next;
1895                         in6_dev_put(pmc->idev);
1896                         kfree(pmc);
1897                 } else
1898                         pmc_prev = pmc;
1899         }
1900         spin_unlock(&idev->mc_lock);
1901
1902         /* change recs */
1903         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1904                 spin_lock_bh(&pmc->mca_lock);
1905                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1906                         type = MLD2_BLOCK_OLD_SOURCES;
1907                         dtype = MLD2_ALLOW_NEW_SOURCES;
1908                 } else {
1909                         type = MLD2_ALLOW_NEW_SOURCES;
1910                         dtype = MLD2_BLOCK_OLD_SOURCES;
1911                 }
1912                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1913                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1914
1915                 /* filter mode changes */
1916                 if (pmc->mca_crcount) {
1917                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1918                                 type = MLD2_CHANGE_TO_EXCLUDE;
1919                         else
1920                                 type = MLD2_CHANGE_TO_INCLUDE;
1921                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1922                         pmc->mca_crcount--;
1923                 }
1924                 spin_unlock_bh(&pmc->mca_lock);
1925         }
1926         read_unlock_bh(&idev->lock);
1927         if (!skb)
1928                 return;
1929         (void) mld_sendpack(skb);
1930 }
1931
1932 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1933 {
1934         struct net *net = dev_net(dev);
1935         struct sock *sk = net->ipv6.igmp_sk;
1936         struct inet6_dev *idev;
1937         struct sk_buff *skb;
1938         struct mld_msg *hdr;
1939         const struct in6_addr *snd_addr, *saddr;
1940         struct in6_addr addr_buf;
1941         int hlen = LL_RESERVED_SPACE(dev);
1942         int tlen = dev->needed_tailroom;
1943         int err, len, payload_len, full_len;
1944         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1945                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1946                      IPV6_TLV_PADN, 0 };
1947         struct flowi6 fl6;
1948         struct dst_entry *dst;
1949
1950         if (type == ICMPV6_MGM_REDUCTION)
1951                 snd_addr = &in6addr_linklocal_allrouters;
1952         else
1953                 snd_addr = addr;
1954
1955         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1956         payload_len = len + sizeof(ra);
1957         full_len = sizeof(struct ipv6hdr) + payload_len;
1958
1959         rcu_read_lock();
1960         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1961                       IPSTATS_MIB_OUT, full_len);
1962         rcu_read_unlock();
1963
1964         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1965
1966         if (!skb) {
1967                 rcu_read_lock();
1968                 IP6_INC_STATS(net, __in6_dev_get(dev),
1969                               IPSTATS_MIB_OUTDISCARDS);
1970                 rcu_read_unlock();
1971                 return;
1972         }
1973         skb->priority = TC_PRIO_CONTROL;
1974         skb_reserve(skb, hlen);
1975
1976         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1977                 /* <draft-ietf-magma-mld-source-05.txt>:
1978                  * use unspecified address as the source address
1979                  * when a valid link-local address is not available.
1980                  */
1981                 saddr = &in6addr_any;
1982         } else
1983                 saddr = &addr_buf;
1984
1985         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1986
1987         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1988
1989         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1990         memset(hdr, 0, sizeof(struct mld_msg));
1991         hdr->mld_type = type;
1992         hdr->mld_mca = *addr;
1993
1994         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1995                                          IPPROTO_ICMPV6,
1996                                          csum_partial(hdr, len, 0));
1997
1998         rcu_read_lock();
1999         idev = __in6_dev_get(skb->dev);
2000
2001         icmpv6_flow_init(sk, &fl6, type,
2002                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2003                          skb->dev->ifindex);
2004         dst = icmp6_dst_alloc(skb->dev, &fl6);
2005         if (IS_ERR(dst)) {
2006                 err = PTR_ERR(dst);
2007                 goto err_out;
2008         }
2009
2010         skb_dst_set(skb, dst);
2011         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, sk, skb,
2012                       NULL, skb->dev, dst_output_sk);
2013 out:
2014         if (!err) {
2015                 ICMP6MSGOUT_INC_STATS(net, idev, type);
2016                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2017                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
2018         } else
2019                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2020
2021         rcu_read_unlock();
2022         return;
2023
2024 err_out:
2025         kfree_skb(skb);
2026         goto out;
2027 }
2028
2029 static void mld_send_initial_cr(struct inet6_dev *idev)
2030 {
2031         struct sk_buff *skb;
2032         struct ifmcaddr6 *pmc;
2033         int type;
2034
2035         if (mld_in_v1_mode(idev))
2036                 return;
2037
2038         skb = NULL;
2039         read_lock_bh(&idev->lock);
2040         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2041                 spin_lock_bh(&pmc->mca_lock);
2042                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2043                         type = MLD2_CHANGE_TO_EXCLUDE;
2044                 else
2045                         type = MLD2_CHANGE_TO_INCLUDE;
2046                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2047                 spin_unlock_bh(&pmc->mca_lock);
2048         }
2049         read_unlock_bh(&idev->lock);
2050         if (skb)
2051                 mld_sendpack(skb);
2052 }
2053
2054 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2055 {
2056         idev->mc_dad_count = idev->mc_qrv;
2057         if (idev->mc_dad_count) {
2058                 mld_send_initial_cr(idev);
2059                 idev->mc_dad_count--;
2060                 if (idev->mc_dad_count)
2061                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2062         }
2063 }
2064
2065 static void mld_dad_timer_expire(unsigned long data)
2066 {
2067         struct inet6_dev *idev = (struct inet6_dev *)data;
2068
2069         mld_send_initial_cr(idev);
2070         if (idev->mc_dad_count) {
2071                 idev->mc_dad_count--;
2072                 if (idev->mc_dad_count)
2073                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2074         }
2075         in6_dev_put(idev);
2076 }
2077
2078 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2079         const struct in6_addr *psfsrc)
2080 {
2081         struct ip6_sf_list *psf, *psf_prev;
2082         int rv = 0;
2083
2084         psf_prev = NULL;
2085         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2086                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2087                         break;
2088                 psf_prev = psf;
2089         }
2090         if (!psf || psf->sf_count[sfmode] == 0) {
2091                 /* source filter not found, or count wrong =>  bug */
2092                 return -ESRCH;
2093         }
2094         psf->sf_count[sfmode]--;
2095         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2096                 struct inet6_dev *idev = pmc->idev;
2097
2098                 /* no more filters for this source */
2099                 if (psf_prev)
2100                         psf_prev->sf_next = psf->sf_next;
2101                 else
2102                         pmc->mca_sources = psf->sf_next;
2103                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2104                     !mld_in_v1_mode(idev)) {
2105                         psf->sf_crcount = idev->mc_qrv;
2106                         psf->sf_next = pmc->mca_tomb;
2107                         pmc->mca_tomb = psf;
2108                         rv = 1;
2109                 } else
2110                         kfree(psf);
2111         }
2112         return rv;
2113 }
2114
2115 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2116                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2117                           int delta)
2118 {
2119         struct ifmcaddr6 *pmc;
2120         int     changerec = 0;
2121         int     i, err;
2122
2123         if (!idev)
2124                 return -ENODEV;
2125         read_lock_bh(&idev->lock);
2126         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2127                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2128                         break;
2129         }
2130         if (!pmc) {
2131                 /* MCA not found?? bug */
2132                 read_unlock_bh(&idev->lock);
2133                 return -ESRCH;
2134         }
2135         spin_lock_bh(&pmc->mca_lock);
2136         sf_markstate(pmc);
2137         if (!delta) {
2138                 if (!pmc->mca_sfcount[sfmode]) {
2139                         spin_unlock_bh(&pmc->mca_lock);
2140                         read_unlock_bh(&idev->lock);
2141                         return -EINVAL;
2142                 }
2143                 pmc->mca_sfcount[sfmode]--;
2144         }
2145         err = 0;
2146         for (i = 0; i < sfcount; i++) {
2147                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2148
2149                 changerec |= rv > 0;
2150                 if (!err && rv < 0)
2151                         err = rv;
2152         }
2153         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2154             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2155             pmc->mca_sfcount[MCAST_INCLUDE]) {
2156                 struct ip6_sf_list *psf;
2157
2158                 /* filter mode change */
2159                 pmc->mca_sfmode = MCAST_INCLUDE;
2160                 pmc->mca_crcount = idev->mc_qrv;
2161                 idev->mc_ifc_count = pmc->mca_crcount;
2162                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2163                         psf->sf_crcount = 0;
2164                 mld_ifc_event(pmc->idev);
2165         } else if (sf_setstate(pmc) || changerec)
2166                 mld_ifc_event(pmc->idev);
2167         spin_unlock_bh(&pmc->mca_lock);
2168         read_unlock_bh(&idev->lock);
2169         return err;
2170 }
2171
2172 /*
2173  * Add multicast single-source filter to the interface list
2174  */
2175 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2176         const struct in6_addr *psfsrc)
2177 {
2178         struct ip6_sf_list *psf, *psf_prev;
2179
2180         psf_prev = NULL;
2181         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2182                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2183                         break;
2184                 psf_prev = psf;
2185         }
2186         if (!psf) {
2187                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2188                 if (!psf)
2189                         return -ENOBUFS;
2190
2191                 psf->sf_addr = *psfsrc;
2192                 if (psf_prev) {
2193                         psf_prev->sf_next = psf;
2194                 } else
2195                         pmc->mca_sources = psf;
2196         }
2197         psf->sf_count[sfmode]++;
2198         return 0;
2199 }
2200
2201 static void sf_markstate(struct ifmcaddr6 *pmc)
2202 {
2203         struct ip6_sf_list *psf;
2204         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2205
2206         for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2207                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2208                         psf->sf_oldin = mca_xcount ==
2209                                 psf->sf_count[MCAST_EXCLUDE] &&
2210                                 !psf->sf_count[MCAST_INCLUDE];
2211                 } else
2212                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2213 }
2214
2215 static int sf_setstate(struct ifmcaddr6 *pmc)
2216 {
2217         struct ip6_sf_list *psf, *dpsf;
2218         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2219         int qrv = pmc->idev->mc_qrv;
2220         int new_in, rv;
2221
2222         rv = 0;
2223         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2224                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2225                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2226                                 !psf->sf_count[MCAST_INCLUDE];
2227                 } else
2228                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2229                 if (new_in) {
2230                         if (!psf->sf_oldin) {
2231                                 struct ip6_sf_list *prev = NULL;
2232
2233                                 for (dpsf = pmc->mca_tomb; dpsf;
2234                                      dpsf = dpsf->sf_next) {
2235                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2236                                             &psf->sf_addr))
2237                                                 break;
2238                                         prev = dpsf;
2239                                 }
2240                                 if (dpsf) {
2241                                         if (prev)
2242                                                 prev->sf_next = dpsf->sf_next;
2243                                         else
2244                                                 pmc->mca_tomb = dpsf->sf_next;
2245                                         kfree(dpsf);
2246                                 }
2247                                 psf->sf_crcount = qrv;
2248                                 rv++;
2249                         }
2250                 } else if (psf->sf_oldin) {
2251                         psf->sf_crcount = 0;
2252                         /*
2253                          * add or update "delete" records if an active filter
2254                          * is now inactive
2255                          */
2256                         for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2257                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2258                                     &psf->sf_addr))
2259                                         break;
2260                         if (!dpsf) {
2261                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2262                                 if (!dpsf)
2263                                         continue;
2264                                 *dpsf = *psf;
2265                                 /* pmc->mca_lock held by callers */
2266                                 dpsf->sf_next = pmc->mca_tomb;
2267                                 pmc->mca_tomb = dpsf;
2268                         }
2269                         dpsf->sf_crcount = qrv;
2270                         rv++;
2271                 }
2272         }
2273         return rv;
2274 }
2275
2276 /*
2277  * Add multicast source filter list to the interface list
2278  */
2279 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2280                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2281                           int delta)
2282 {
2283         struct ifmcaddr6 *pmc;
2284         int     isexclude;
2285         int     i, err;
2286
2287         if (!idev)
2288                 return -ENODEV;
2289         read_lock_bh(&idev->lock);
2290         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2291                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2292                         break;
2293         }
2294         if (!pmc) {
2295                 /* MCA not found?? bug */
2296                 read_unlock_bh(&idev->lock);
2297                 return -ESRCH;
2298         }
2299         spin_lock_bh(&pmc->mca_lock);
2300
2301         sf_markstate(pmc);
2302         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2303         if (!delta)
2304                 pmc->mca_sfcount[sfmode]++;
2305         err = 0;
2306         for (i = 0; i < sfcount; i++) {
2307                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2308                 if (err)
2309                         break;
2310         }
2311         if (err) {
2312                 int j;
2313
2314                 if (!delta)
2315                         pmc->mca_sfcount[sfmode]--;
2316                 for (j = 0; j < i; j++)
2317                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2318         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2319                 struct ip6_sf_list *psf;
2320
2321                 /* filter mode change */
2322                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2323                         pmc->mca_sfmode = MCAST_EXCLUDE;
2324                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2325                         pmc->mca_sfmode = MCAST_INCLUDE;
2326                 /* else no filters; keep old mode for reports */
2327
2328                 pmc->mca_crcount = idev->mc_qrv;
2329                 idev->mc_ifc_count = pmc->mca_crcount;
2330                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2331                         psf->sf_crcount = 0;
2332                 mld_ifc_event(idev);
2333         } else if (sf_setstate(pmc))
2334                 mld_ifc_event(idev);
2335         spin_unlock_bh(&pmc->mca_lock);
2336         read_unlock_bh(&idev->lock);
2337         return err;
2338 }
2339
2340 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2341 {
2342         struct ip6_sf_list *psf, *nextpsf;
2343
2344         for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2345                 nextpsf = psf->sf_next;
2346                 kfree(psf);
2347         }
2348         pmc->mca_tomb = NULL;
2349         for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2350                 nextpsf = psf->sf_next;
2351                 kfree(psf);
2352         }
2353         pmc->mca_sources = NULL;
2354         pmc->mca_sfmode = MCAST_EXCLUDE;
2355         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2356         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2357 }
2358
2359
2360 static void igmp6_join_group(struct ifmcaddr6 *ma)
2361 {
2362         unsigned long delay;
2363
2364         if (ma->mca_flags & MAF_NOREPORT)
2365                 return;
2366
2367         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2368
2369         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2370
2371         spin_lock_bh(&ma->mca_lock);
2372         if (del_timer(&ma->mca_timer)) {
2373                 atomic_dec(&ma->mca_refcnt);
2374                 delay = ma->mca_timer.expires - jiffies;
2375         }
2376
2377         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2378                 atomic_inc(&ma->mca_refcnt);
2379         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2380         spin_unlock_bh(&ma->mca_lock);
2381 }
2382
2383 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2384                             struct inet6_dev *idev)
2385 {
2386         int err;
2387
2388         /* callers have the socket lock and rtnl lock
2389          * so no other readers or writers of iml or its sflist
2390          */
2391         if (!iml->sflist) {
2392                 /* any-source empty exclude case */
2393                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2394         }
2395         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2396                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2397         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2398         iml->sflist = NULL;
2399         return err;
2400 }
2401
2402 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2403 {
2404         if (mld_in_v1_mode(ma->idev)) {
2405                 if (ma->mca_flags & MAF_LAST_REPORTER)
2406                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2407                                 ICMPV6_MGM_REDUCTION);
2408         } else {
2409                 mld_add_delrec(ma->idev, ma);
2410                 mld_ifc_event(ma->idev);
2411         }
2412 }
2413
2414 static void mld_gq_timer_expire(unsigned long data)
2415 {
2416         struct inet6_dev *idev = (struct inet6_dev *)data;
2417
2418         idev->mc_gq_running = 0;
2419         mld_send_report(idev, NULL);
2420         in6_dev_put(idev);
2421 }
2422
2423 static void mld_ifc_timer_expire(unsigned long data)
2424 {
2425         struct inet6_dev *idev = (struct inet6_dev *)data;
2426
2427         mld_send_cr(idev);
2428         if (idev->mc_ifc_count) {
2429                 idev->mc_ifc_count--;
2430                 if (idev->mc_ifc_count)
2431                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2432         }
2433         in6_dev_put(idev);
2434 }
2435
2436 static void mld_ifc_event(struct inet6_dev *idev)
2437 {
2438         if (mld_in_v1_mode(idev))
2439                 return;
2440         idev->mc_ifc_count = idev->mc_qrv;
2441         mld_ifc_start_timer(idev, 1);
2442 }
2443
2444
2445 static void igmp6_timer_handler(unsigned long data)
2446 {
2447         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2448
2449         if (mld_in_v1_mode(ma->idev))
2450                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2451         else
2452                 mld_send_report(ma->idev, ma);
2453
2454         spin_lock(&ma->mca_lock);
2455         ma->mca_flags |=  MAF_LAST_REPORTER;
2456         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2457         spin_unlock(&ma->mca_lock);
2458         ma_put(ma);
2459 }
2460
2461 /* Device changing type */
2462
2463 void ipv6_mc_unmap(struct inet6_dev *idev)
2464 {
2465         struct ifmcaddr6 *i;
2466
2467         /* Install multicast list, except for all-nodes (already installed) */
2468
2469         read_lock_bh(&idev->lock);
2470         for (i = idev->mc_list; i; i = i->next)
2471                 igmp6_group_dropped(i);
2472         read_unlock_bh(&idev->lock);
2473 }
2474
2475 void ipv6_mc_remap(struct inet6_dev *idev)
2476 {
2477         ipv6_mc_up(idev);
2478 }
2479
2480 /* Device going down */
2481
2482 void ipv6_mc_down(struct inet6_dev *idev)
2483 {
2484         struct ifmcaddr6 *i;
2485
2486         /* Withdraw multicast list */
2487
2488         read_lock_bh(&idev->lock);
2489         mld_ifc_stop_timer(idev);
2490         mld_gq_stop_timer(idev);
2491         mld_dad_stop_timer(idev);
2492
2493         for (i = idev->mc_list; i; i = i->next)
2494                 igmp6_group_dropped(i);
2495         read_unlock_bh(&idev->lock);
2496
2497         mld_clear_delrec(idev);
2498 }
2499
2500 static void ipv6_mc_reset(struct inet6_dev *idev)
2501 {
2502         idev->mc_qrv = sysctl_mld_qrv;
2503         idev->mc_qi = MLD_QI_DEFAULT;
2504         idev->mc_qri = MLD_QRI_DEFAULT;
2505         idev->mc_v1_seen = 0;
2506         idev->mc_maxdelay = unsolicited_report_interval(idev);
2507 }
2508
2509 /* Device going up */
2510
2511 void ipv6_mc_up(struct inet6_dev *idev)
2512 {
2513         struct ifmcaddr6 *i;
2514
2515         /* Install multicast list, except for all-nodes (already installed) */
2516
2517         read_lock_bh(&idev->lock);
2518         ipv6_mc_reset(idev);
2519         for (i = idev->mc_list; i; i = i->next)
2520                 igmp6_group_added(i);
2521         read_unlock_bh(&idev->lock);
2522 }
2523
2524 /* IPv6 device initialization. */
2525
2526 void ipv6_mc_init_dev(struct inet6_dev *idev)
2527 {
2528         write_lock_bh(&idev->lock);
2529         spin_lock_init(&idev->mc_lock);
2530         idev->mc_gq_running = 0;
2531         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2532                         (unsigned long)idev);
2533         idev->mc_tomb = NULL;
2534         idev->mc_ifc_count = 0;
2535         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2536                         (unsigned long)idev);
2537         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2538                     (unsigned long)idev);
2539         ipv6_mc_reset(idev);
2540         write_unlock_bh(&idev->lock);
2541 }
2542
2543 /*
2544  *      Device is about to be destroyed: clean up.
2545  */
2546
2547 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2548 {
2549         struct ifmcaddr6 *i;
2550
2551         /* Deactivate timers */
2552         ipv6_mc_down(idev);
2553
2554         /* Delete all-nodes address. */
2555         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2556          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2557          * fail.
2558          */
2559         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2560
2561         if (idev->cnf.forwarding)
2562                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2563
2564         write_lock_bh(&idev->lock);
2565         while ((i = idev->mc_list) != NULL) {
2566                 idev->mc_list = i->next;
2567                 write_unlock_bh(&idev->lock);
2568
2569                 igmp6_group_dropped(i);
2570                 ma_put(i);
2571
2572                 write_lock_bh(&idev->lock);
2573         }
2574         write_unlock_bh(&idev->lock);
2575 }
2576
2577 #ifdef CONFIG_PROC_FS
2578 struct igmp6_mc_iter_state {
2579         struct seq_net_private p;
2580         struct net_device *dev;
2581         struct inet6_dev *idev;
2582 };
2583
2584 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2585
2586 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2587 {
2588         struct ifmcaddr6 *im = NULL;
2589         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2590         struct net *net = seq_file_net(seq);
2591
2592         state->idev = NULL;
2593         for_each_netdev_rcu(net, state->dev) {
2594                 struct inet6_dev *idev;
2595                 idev = __in6_dev_get(state->dev);
2596                 if (!idev)
2597                         continue;
2598                 read_lock_bh(&idev->lock);
2599                 im = idev->mc_list;
2600                 if (im) {
2601                         state->idev = idev;
2602                         break;
2603                 }
2604                 read_unlock_bh(&idev->lock);
2605         }
2606         return im;
2607 }
2608
2609 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2610 {
2611         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2612
2613         im = im->next;
2614         while (!im) {
2615                 if (likely(state->idev))
2616                         read_unlock_bh(&state->idev->lock);
2617
2618                 state->dev = next_net_device_rcu(state->dev);
2619                 if (!state->dev) {
2620                         state->idev = NULL;
2621                         break;
2622                 }
2623                 state->idev = __in6_dev_get(state->dev);
2624                 if (!state->idev)
2625                         continue;
2626                 read_lock_bh(&state->idev->lock);
2627                 im = state->idev->mc_list;
2628         }
2629         return im;
2630 }
2631
2632 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2633 {
2634         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2635         if (im)
2636                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2637                         --pos;
2638         return pos ? NULL : im;
2639 }
2640
2641 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2642         __acquires(RCU)
2643 {
2644         rcu_read_lock();
2645         return igmp6_mc_get_idx(seq, *pos);
2646 }
2647
2648 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2649 {
2650         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2651
2652         ++*pos;
2653         return im;
2654 }
2655
2656 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2657         __releases(RCU)
2658 {
2659         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2660
2661         if (likely(state->idev)) {
2662                 read_unlock_bh(&state->idev->lock);
2663                 state->idev = NULL;
2664         }
2665         state->dev = NULL;
2666         rcu_read_unlock();
2667 }
2668
2669 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2670 {
2671         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2672         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2673
2674         seq_printf(seq,
2675                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2676                    state->dev->ifindex, state->dev->name,
2677                    &im->mca_addr,
2678                    im->mca_users, im->mca_flags,
2679                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2680                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2681         return 0;
2682 }
2683
2684 static const struct seq_operations igmp6_mc_seq_ops = {
2685         .start  =       igmp6_mc_seq_start,
2686         .next   =       igmp6_mc_seq_next,
2687         .stop   =       igmp6_mc_seq_stop,
2688         .show   =       igmp6_mc_seq_show,
2689 };
2690
2691 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2692 {
2693         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2694                             sizeof(struct igmp6_mc_iter_state));
2695 }
2696
2697 static const struct file_operations igmp6_mc_seq_fops = {
2698         .owner          =       THIS_MODULE,
2699         .open           =       igmp6_mc_seq_open,
2700         .read           =       seq_read,
2701         .llseek         =       seq_lseek,
2702         .release        =       seq_release_net,
2703 };
2704
2705 struct igmp6_mcf_iter_state {
2706         struct seq_net_private p;
2707         struct net_device *dev;
2708         struct inet6_dev *idev;
2709         struct ifmcaddr6 *im;
2710 };
2711
2712 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2713
2714 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2715 {
2716         struct ip6_sf_list *psf = NULL;
2717         struct ifmcaddr6 *im = NULL;
2718         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2719         struct net *net = seq_file_net(seq);
2720
2721         state->idev = NULL;
2722         state->im = NULL;
2723         for_each_netdev_rcu(net, state->dev) {
2724                 struct inet6_dev *idev;
2725                 idev = __in6_dev_get(state->dev);
2726                 if (unlikely(idev == NULL))
2727                         continue;
2728                 read_lock_bh(&idev->lock);
2729                 im = idev->mc_list;
2730                 if (likely(im)) {
2731                         spin_lock_bh(&im->mca_lock);
2732                         psf = im->mca_sources;
2733                         if (likely(psf)) {
2734                                 state->im = im;
2735                                 state->idev = idev;
2736                                 break;
2737                         }
2738                         spin_unlock_bh(&im->mca_lock);
2739                 }
2740                 read_unlock_bh(&idev->lock);
2741         }
2742         return psf;
2743 }
2744
2745 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2746 {
2747         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2748
2749         psf = psf->sf_next;
2750         while (!psf) {
2751                 spin_unlock_bh(&state->im->mca_lock);
2752                 state->im = state->im->next;
2753                 while (!state->im) {
2754                         if (likely(state->idev))
2755                                 read_unlock_bh(&state->idev->lock);
2756
2757                         state->dev = next_net_device_rcu(state->dev);
2758                         if (!state->dev) {
2759                                 state->idev = NULL;
2760                                 goto out;
2761                         }
2762                         state->idev = __in6_dev_get(state->dev);
2763                         if (!state->idev)
2764                                 continue;
2765                         read_lock_bh(&state->idev->lock);
2766                         state->im = state->idev->mc_list;
2767                 }
2768                 if (!state->im)
2769                         break;
2770                 spin_lock_bh(&state->im->mca_lock);
2771                 psf = state->im->mca_sources;
2772         }
2773 out:
2774         return psf;
2775 }
2776
2777 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2778 {
2779         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2780         if (psf)
2781                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2782                         --pos;
2783         return pos ? NULL : psf;
2784 }
2785
2786 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2787         __acquires(RCU)
2788 {
2789         rcu_read_lock();
2790         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2791 }
2792
2793 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2794 {
2795         struct ip6_sf_list *psf;
2796         if (v == SEQ_START_TOKEN)
2797                 psf = igmp6_mcf_get_first(seq);
2798         else
2799                 psf = igmp6_mcf_get_next(seq, v);
2800         ++*pos;
2801         return psf;
2802 }
2803
2804 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2805         __releases(RCU)
2806 {
2807         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2808         if (likely(state->im)) {
2809                 spin_unlock_bh(&state->im->mca_lock);
2810                 state->im = NULL;
2811         }
2812         if (likely(state->idev)) {
2813                 read_unlock_bh(&state->idev->lock);
2814                 state->idev = NULL;
2815         }
2816         state->dev = NULL;
2817         rcu_read_unlock();
2818 }
2819
2820 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2821 {
2822         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2823         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2824
2825         if (v == SEQ_START_TOKEN) {
2826                 seq_puts(seq, "Idx Device                Multicast Address                   Source Address    INC    EXC\n");
2827         } else {
2828                 seq_printf(seq,
2829                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2830                            state->dev->ifindex, state->dev->name,
2831                            &state->im->mca_addr,
2832                            &psf->sf_addr,
2833                            psf->sf_count[MCAST_INCLUDE],
2834                            psf->sf_count[MCAST_EXCLUDE]);
2835         }
2836         return 0;
2837 }
2838
2839 static const struct seq_operations igmp6_mcf_seq_ops = {
2840         .start  =       igmp6_mcf_seq_start,
2841         .next   =       igmp6_mcf_seq_next,
2842         .stop   =       igmp6_mcf_seq_stop,
2843         .show   =       igmp6_mcf_seq_show,
2844 };
2845
2846 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2847 {
2848         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2849                             sizeof(struct igmp6_mcf_iter_state));
2850 }
2851
2852 static const struct file_operations igmp6_mcf_seq_fops = {
2853         .owner          =       THIS_MODULE,
2854         .open           =       igmp6_mcf_seq_open,
2855         .read           =       seq_read,
2856         .llseek         =       seq_lseek,
2857         .release        =       seq_release_net,
2858 };
2859
2860 static int __net_init igmp6_proc_init(struct net *net)
2861 {
2862         int err;
2863
2864         err = -ENOMEM;
2865         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2866                 goto out;
2867         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2868                          &igmp6_mcf_seq_fops))
2869                 goto out_proc_net_igmp6;
2870
2871         err = 0;
2872 out:
2873         return err;
2874
2875 out_proc_net_igmp6:
2876         remove_proc_entry("igmp6", net->proc_net);
2877         goto out;
2878 }
2879
2880 static void __net_exit igmp6_proc_exit(struct net *net)
2881 {
2882         remove_proc_entry("mcfilter6", net->proc_net);
2883         remove_proc_entry("igmp6", net->proc_net);
2884 }
2885 #else
2886 static inline int igmp6_proc_init(struct net *net)
2887 {
2888         return 0;
2889 }
2890 static inline void igmp6_proc_exit(struct net *net)
2891 {
2892 }
2893 #endif
2894
2895 static int __net_init igmp6_net_init(struct net *net)
2896 {
2897         int err;
2898
2899         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2900                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2901         if (err < 0) {
2902                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2903                        err);
2904                 goto out;
2905         }
2906
2907         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2908
2909         err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2910                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2911         if (err < 0) {
2912                 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2913                        err);
2914                 goto out_sock_create;
2915         }
2916
2917         err = igmp6_proc_init(net);
2918         if (err)
2919                 goto out_sock_create_autojoin;
2920
2921         return 0;
2922
2923 out_sock_create_autojoin:
2924         inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2925 out_sock_create:
2926         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2927 out:
2928         return err;
2929 }
2930
2931 static void __net_exit igmp6_net_exit(struct net *net)
2932 {
2933         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2934         inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2935         igmp6_proc_exit(net);
2936 }
2937
2938 static struct pernet_operations igmp6_net_ops = {
2939         .init = igmp6_net_init,
2940         .exit = igmp6_net_exit,
2941 };
2942
2943 int __init igmp6_init(void)
2944 {
2945         return register_pernet_subsys(&igmp6_net_ops);
2946 }
2947
2948 void igmp6_cleanup(void)
2949 {
2950         unregister_pernet_subsys(&igmp6_net_ops);
2951 }