net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <linux/pkt_sched.h>
  48 #include <net/mld.h>
  49
  50 #include <linux/netfilter.h>
  51 #include <linux/netfilter_ipv6.h>
  52
  53 #include <net/net_namespace.h>
  54 #include <net/sock.h>
  55 #include <net/snmp.h>
  56
  57 #include <net/ipv6.h>
  58 #include <net/protocol.h>
  59 #include <net/if_inet6.h>
  60 #include <net/ndisc.h>
  61 #include <net/addrconf.h>
  62 #include <net/ip6_route.h>
  63 #include <net/inet_common.h>
  64
  65 #include <net/ip6_checksum.h>
  66
  67 /* Set to 3 to get tracing... */
  68 #define MCAST_DEBUG 2
  69
  70 #if MCAST_DEBUG >= 3
  71 #define MDBG(x) printk x
  72 #else
  73 #define MDBG(x)
  74 #endif
  75
  76 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  77 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  80         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  81 };
  82
  83 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  84
  85 /* Big mc list lock for all the sockets */
  86 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  87
  88 static void igmp6_join_group(struct ifmcaddr6 *ma);
  89 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  90 static void igmp6_timer_handler(unsigned long data);
  91
  92 static void mld_gq_timer_expire(unsigned long data);
  93 static void mld_ifc_timer_expire(unsigned long data);
  94 static void mld_ifc_event(struct inet6_dev *idev);
  95 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  96 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  97 static void mld_clear_delrec(struct inet6_dev *idev);
  98 static bool mld_in_v1_mode(const struct inet6_dev *idev);
  99 static int sf_setstate(struct ifmcaddr6 *pmc);
 100 static void sf_markstate(struct ifmcaddr6 *pmc);
 101 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 102 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 103                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 104                           int delta);
 105 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 106                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 107                           int delta);
 108 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 109                             struct inet6_dev *idev);
 110
 111 #define MLD_QRV_DEFAULT         2
 112 /* RFC3810, 9.2. Query Interval */
 113 #define MLD_QI_DEFAULT          (125 * HZ)
 114 /* RFC3810, 9.3. Query Response Interval */
 115 #define MLD_QRI_DEFAULT         (10 * HZ)
 116
 117 /* RFC3810, 8.1 Query Version Distinctions */
 118 #define MLD_V1_QUERY_LEN        24
 119 #define MLD_V2_QUERY_LEN_MIN    28
 120
 121 #define IPV6_MLD_MAX_MSF        64
 122
 123 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 124 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
 125
 126 /*
 127  *      socket join on multicast group
 128  */
 129
 130 #define for_each_pmc_rcu(np, pmc)                               \
 131         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 132              pmc != NULL;                                       \
 133              pmc = rcu_dereference(pmc->next))
 134
 135 static int unsolicited_report_interval(struct inet6_dev *idev)
 136 {
 137         int iv;
 138
 139         if (mld_in_v1_mode(idev))
 140                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 141         else
 142                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 143
 144         return iv > 0 ? iv : 1;
 145 }
 146
 147 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 148 {
 149         struct net_device *dev = NULL;
 150         struct ipv6_mc_socklist *mc_lst;
 151         struct ipv6_pinfo *np = inet6_sk(sk);
 152         struct net *net = sock_net(sk);
 153         int err;
 154
 155         if (!ipv6_addr_is_multicast(addr))
 156                 return -EINVAL;
 157
 158         rcu_read_lock();
 159         for_each_pmc_rcu(np, mc_lst) {
 160                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 161                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 162                         rcu_read_unlock();
 163                         return -EADDRINUSE;
 164                 }
 165         }
 166         rcu_read_unlock();
 167
 168         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 169
 170         if (mc_lst == NULL)
 171                 return -ENOMEM;
 172
 173         mc_lst->next = NULL;
 174         mc_lst->addr = *addr;
 175
 176         rtnl_lock();
 177         rcu_read_lock();
 178         if (ifindex == 0) {
 179                 struct rt6_info *rt;
 180                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 181                 if (rt) {
 182                         dev = rt->dst.dev;
 183                         ip6_rt_put(rt);
 184                 }
 185         } else
 186                 dev = dev_get_by_index_rcu(net, ifindex);
 187
 188         if (dev == NULL) {
 189                 rcu_read_unlock();
 190                 rtnl_unlock();
 191                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 192                 return -ENODEV;
 193         }
 194
 195         mc_lst->ifindex = dev->ifindex;
 196         mc_lst->sfmode = MCAST_EXCLUDE;
 197         rwlock_init(&mc_lst->sflock);
 198         mc_lst->sflist = NULL;
 199
 200         /*
 201          *      now add/increase the group membership on the device
 202          */
 203
 204         err = ipv6_dev_mc_inc(dev, addr);
 205
 206         if (err) {
 207                 rcu_read_unlock();
 208                 rtnl_unlock();
 209                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 210                 return err;
 211         }
 212
 213         spin_lock(&ipv6_sk_mc_lock);
 214         mc_lst->next = np->ipv6_mc_list;
 215         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 216         spin_unlock(&ipv6_sk_mc_lock);
 217
 218         rcu_read_unlock();
 219         rtnl_unlock();
 220
 221         return 0;
 222 }
 223
 224 /*
 225  *      socket leave on multicast group
 226  */
 227 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 228 {
 229         struct ipv6_pinfo *np = inet6_sk(sk);
 230         struct ipv6_mc_socklist *mc_lst;
 231         struct ipv6_mc_socklist __rcu **lnk;
 232         struct net *net = sock_net(sk);
 233
 234         if (!ipv6_addr_is_multicast(addr))
 235                 return -EINVAL;
 236
 237         rtnl_lock();
 238         spin_lock(&ipv6_sk_mc_lock);
 239         for (lnk = &np->ipv6_mc_list;
 240              (mc_lst = rcu_dereference_protected(*lnk,
 241                         lockdep_is_held(&ipv6_sk_mc_lock))) != NULL;
 242               lnk = &mc_lst->next) {
 243                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 244                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 245                         struct net_device *dev;
 246
 247                         *lnk = mc_lst->next;
 248                         spin_unlock(&ipv6_sk_mc_lock);
 249
 250                         rcu_read_lock();
 251                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 252                         if (dev != NULL) {
 253                                 struct inet6_dev *idev = __in6_dev_get(dev);
 254
 255                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 256                                 if (idev)
 257                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 258                         } else
 259                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 260                         rcu_read_unlock();
 261                         rtnl_unlock();
 262
 263                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 264                         kfree_rcu(mc_lst, rcu);
 265                         return 0;
 266                 }
 267         }
 268         spin_unlock(&ipv6_sk_mc_lock);
 269         rtnl_unlock();
 270
 271         return -EADDRNOTAVAIL;
 272 }
 273
 274 /* called with rcu_read_lock() */
 275 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 276                                              const struct in6_addr *group,
 277                                              int ifindex)
 278 {
 279         struct net_device *dev = NULL;
 280         struct inet6_dev *idev = NULL;
 281
 282         if (ifindex == 0) {
 283                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 284
 285                 if (rt) {
 286                         dev = rt->dst.dev;
 287                         ip6_rt_put(rt);
 288                 }
 289         } else
 290                 dev = dev_get_by_index_rcu(net, ifindex);
 291
 292         if (!dev)
 293                 return NULL;
 294         idev = __in6_dev_get(dev);
 295         if (!idev)
 296                 return NULL;
 297         read_lock_bh(&idev->lock);
 298         if (idev->dead) {
 299                 read_unlock_bh(&idev->lock);
 300                 return NULL;
 301         }
 302         return idev;
 303 }
 304
 305 void ipv6_sock_mc_close(struct sock *sk)
 306 {
 307         struct ipv6_pinfo *np = inet6_sk(sk);
 308         struct ipv6_mc_socklist *mc_lst;
 309         struct net *net = sock_net(sk);
 310
 311         if (!rcu_access_pointer(np->ipv6_mc_list))
 312                 return;
 313
 314         rtnl_lock();
 315         spin_lock(&ipv6_sk_mc_lock);
 316         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 317                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 318                 struct net_device *dev;
 319
 320                 np->ipv6_mc_list = mc_lst->next;
 321                 spin_unlock(&ipv6_sk_mc_lock);
 322
 323                 rcu_read_lock();
 324                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 325                 if (dev) {
 326                         struct inet6_dev *idev = __in6_dev_get(dev);
 327
 328                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 329                         if (idev)
 330                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 331                 } else
 332                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 333                 rcu_read_unlock();
 334
 335                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 336                 kfree_rcu(mc_lst, rcu);
 337
 338                 spin_lock(&ipv6_sk_mc_lock);
 339         }
 340         spin_unlock(&ipv6_sk_mc_lock);
 341         rtnl_unlock();
 342 }
 343
 344 int ip6_mc_source(int add, int omode, struct sock *sk,
 345         struct group_source_req *pgsr)
 346 {
 347         struct in6_addr *source, *group;
 348         struct ipv6_mc_socklist *pmc;
 349         struct inet6_dev *idev;
 350         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 351         struct ip6_sf_socklist *psl;
 352         struct net *net = sock_net(sk);
 353         int i, j, rv;
 354         int leavegroup = 0;
 355         int pmclocked = 0;
 356         int err;
 357
 358         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 359         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 360
 361         if (!ipv6_addr_is_multicast(group))
 362                 return -EINVAL;
 363
 364         rcu_read_lock();
 365         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 366         if (!idev) {
 367                 rcu_read_unlock();
 368                 return -ENODEV;
 369         }
 370
 371         err = -EADDRNOTAVAIL;
 372
 373         for_each_pmc_rcu(inet6, pmc) {
 374                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 375                         continue;
 376                 if (ipv6_addr_equal(&pmc->addr, group))
 377                         break;
 378         }
 379         if (!pmc) {             /* must have a prior join */
 380                 err = -EINVAL;
 381                 goto done;
 382         }
 383         /* if a source filter was set, must be the same mode as before */
 384         if (pmc->sflist) {
 385                 if (pmc->sfmode != omode) {
 386                         err = -EINVAL;
 387                         goto done;
 388                 }
 389         } else if (pmc->sfmode != omode) {
 390                 /* allow mode switches for empty-set filters */
 391                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 392                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 393                 pmc->sfmode = omode;
 394         }
 395
 396         write_lock(&pmc->sflock);
 397         pmclocked = 1;
 398
 399         psl = pmc->sflist;
 400         if (!add) {
 401                 if (!psl)
 402                         goto done;      /* err = -EADDRNOTAVAIL */
 403                 rv = !0;
 404                 for (i = 0; i < psl->sl_count; i++) {
 405                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 406                         if (rv == 0)
 407                                 break;
 408                 }
 409                 if (rv)         /* source not found */
 410                         goto done;      /* err = -EADDRNOTAVAIL */
 411
 412                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 413                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 414                         leavegroup = 1;
 415                         goto done;
 416                 }
 417
 418                 /* update the interface filter */
 419                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 420
 421                 for (j = i+1; j < psl->sl_count; j++)
 422                         psl->sl_addr[j-1] = psl->sl_addr[j];
 423                 psl->sl_count--;
 424                 err = 0;
 425                 goto done;
 426         }
 427         /* else, add a new source to the filter */
 428
 429         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 430                 err = -ENOBUFS;
 431                 goto done;
 432         }
 433         if (!psl || psl->sl_count == psl->sl_max) {
 434                 struct ip6_sf_socklist *newpsl;
 435                 int count = IP6_SFBLOCK;
 436
 437                 if (psl)
 438                         count += psl->sl_max;
 439                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 440                 if (!newpsl) {
 441                         err = -ENOBUFS;
 442                         goto done;
 443                 }
 444                 newpsl->sl_max = count;
 445                 newpsl->sl_count = count - IP6_SFBLOCK;
 446                 if (psl) {
 447                         for (i = 0; i < psl->sl_count; i++)
 448                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 449                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 450                 }
 451                 pmc->sflist = psl = newpsl;
 452         }
 453         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 454         for (i = 0; i < psl->sl_count; i++) {
 455                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 456                 if (rv == 0) /* There is an error in the address. */
 457                         goto done;
 458         }
 459         for (j = psl->sl_count-1; j >= i; j--)
 460                 psl->sl_addr[j+1] = psl->sl_addr[j];
 461         psl->sl_addr[i] = *source;
 462         psl->sl_count++;
 463         err = 0;
 464         /* update the interface list */
 465         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 466 done:
 467         if (pmclocked)
 468                 write_unlock(&pmc->sflock);
 469         read_unlock_bh(&idev->lock);
 470         rcu_read_unlock();
 471         if (leavegroup)
 472                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 473         return err;
 474 }
 475
 476 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 477 {
 478         const struct in6_addr *group;
 479         struct ipv6_mc_socklist *pmc;
 480         struct inet6_dev *idev;
 481         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 482         struct ip6_sf_socklist *newpsl, *psl;
 483         struct net *net = sock_net(sk);
 484         int leavegroup = 0;
 485         int i, err;
 486
 487         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 488
 489         if (!ipv6_addr_is_multicast(group))
 490                 return -EINVAL;
 491         if (gsf->gf_fmode != MCAST_INCLUDE &&
 492             gsf->gf_fmode != MCAST_EXCLUDE)
 493                 return -EINVAL;
 494
 495         rcu_read_lock();
 496         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 497
 498         if (!idev) {
 499                 rcu_read_unlock();
 500                 return -ENODEV;
 501         }
 502
 503         err = 0;
 504
 505         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 506                 leavegroup = 1;
 507                 goto done;
 508         }
 509
 510         for_each_pmc_rcu(inet6, pmc) {
 511                 if (pmc->ifindex != gsf->gf_interface)
 512                         continue;
 513                 if (ipv6_addr_equal(&pmc->addr, group))
 514                         break;
 515         }
 516         if (!pmc) {             /* must have a prior join */
 517                 err = -EINVAL;
 518                 goto done;
 519         }
 520         if (gsf->gf_numsrc) {
 521                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 522                                                           GFP_ATOMIC);
 523                 if (!newpsl) {
 524                         err = -ENOBUFS;
 525                         goto done;
 526                 }
 527                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 528                 for (i = 0; i < newpsl->sl_count; ++i) {
 529                         struct sockaddr_in6 *psin6;
 530
 531                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 532                         newpsl->sl_addr[i] = psin6->sin6_addr;
 533                 }
 534                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 535                         newpsl->sl_count, newpsl->sl_addr, 0);
 536                 if (err) {
 537                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 538                         goto done;
 539                 }
 540         } else {
 541                 newpsl = NULL;
 542                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 543         }
 544
 545         write_lock(&pmc->sflock);
 546         psl = pmc->sflist;
 547         if (psl) {
 548                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 549                         psl->sl_count, psl->sl_addr, 0);
 550                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 551         } else
 552                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 553         pmc->sflist = newpsl;
 554         pmc->sfmode = gsf->gf_fmode;
 555         write_unlock(&pmc->sflock);
 556         err = 0;
 557 done:
 558         read_unlock_bh(&idev->lock);
 559         rcu_read_unlock();
 560         if (leavegroup)
 561                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 562         return err;
 563 }
 564
 565 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 566         struct group_filter __user *optval, int __user *optlen)
 567 {
 568         int err, i, count, copycount;
 569         const struct in6_addr *group;
 570         struct ipv6_mc_socklist *pmc;
 571         struct inet6_dev *idev;
 572         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 573         struct ip6_sf_socklist *psl;
 574         struct net *net = sock_net(sk);
 575
 576         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 577
 578         if (!ipv6_addr_is_multicast(group))
 579                 return -EINVAL;
 580
 581         rcu_read_lock();
 582         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 583
 584         if (!idev) {
 585                 rcu_read_unlock();
 586                 return -ENODEV;
 587         }
 588
 589         err = -EADDRNOTAVAIL;
 590         /*
 591          * changes to the ipv6_mc_list require the socket lock and
 592          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 593          * so reading the list is safe.
 594          */
 595
 596         for_each_pmc_rcu(inet6, pmc) {
 597                 if (pmc->ifindex != gsf->gf_interface)
 598                         continue;
 599                 if (ipv6_addr_equal(group, &pmc->addr))
 600                         break;
 601         }
 602         if (!pmc)               /* must have a prior join */
 603                 goto done;
 604         gsf->gf_fmode = pmc->sfmode;
 605         psl = pmc->sflist;
 606         count = psl ? psl->sl_count : 0;
 607         read_unlock_bh(&idev->lock);
 608         rcu_read_unlock();
 609
 610         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 611         gsf->gf_numsrc = count;
 612         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 613             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 614                 return -EFAULT;
 615         }
 616         /* changes to psl require the socket lock, a read lock on
 617          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 618          * have the socket lock, so reading here is safe.
 619          */
 620         for (i = 0; i < copycount; i++) {
 621                 struct sockaddr_in6 *psin6;
 622                 struct sockaddr_storage ss;
 623
 624                 psin6 = (struct sockaddr_in6 *)&ss;
 625                 memset(&ss, 0, sizeof(ss));
 626                 psin6->sin6_family = AF_INET6;
 627                 psin6->sin6_addr = psl->sl_addr[i];
 628                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 629                         return -EFAULT;
 630         }
 631         return 0;
 632 done:
 633         read_unlock_bh(&idev->lock);
 634         rcu_read_unlock();
 635         return err;
 636 }
 637
 638 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 639                     const struct in6_addr *src_addr)
 640 {
 641         struct ipv6_pinfo *np = inet6_sk(sk);
 642         struct ipv6_mc_socklist *mc;
 643         struct ip6_sf_socklist *psl;
 644         bool rv = true;
 645
 646         rcu_read_lock();
 647         for_each_pmc_rcu(np, mc) {
 648                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 649                         break;
 650         }
 651         if (!mc) {
 652                 rcu_read_unlock();
 653                 return true;
 654         }
 655         read_lock(&mc->sflock);
 656         psl = mc->sflist;
 657         if (!psl) {
 658                 rv = mc->sfmode == MCAST_EXCLUDE;
 659         } else {
 660                 int i;
 661
 662                 for (i = 0; i < psl->sl_count; i++) {
 663                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 664                                 break;
 665                 }
 666                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 667                         rv = false;
 668                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 669                         rv = false;
 670         }
 671         read_unlock(&mc->sflock);
 672         rcu_read_unlock();
 673
 674         return rv;
 675 }
 676
 677 static void ma_put(struct ifmcaddr6 *mc)
 678 {
 679         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 680                 in6_dev_put(mc->idev);
 681                 kfree(mc);
 682         }
 683 }
 684
 685 static void igmp6_group_added(struct ifmcaddr6 *mc)
 686 {
 687         struct net_device *dev = mc->idev->dev;
 688         char buf[MAX_ADDR_LEN];
 689
 690         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 691             IPV6_ADDR_SCOPE_LINKLOCAL)
 692                 return;
 693
 694         spin_lock_bh(&mc->mca_lock);
 695         if (!(mc->mca_flags&MAF_LOADED)) {
 696                 mc->mca_flags |= MAF_LOADED;
 697                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 698                         dev_mc_add(dev, buf);
 699         }
 700         spin_unlock_bh(&mc->mca_lock);
 701
 702         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 703                 return;
 704
 705         if (mld_in_v1_mode(mc->idev)) {
 706                 igmp6_join_group(mc);
 707                 return;
 708         }
 709         /* else v2 */
 710
 711         mc->mca_crcount = mc->idev->mc_qrv;
 712         mld_ifc_event(mc->idev);
 713 }
 714
 715 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 716 {
 717         struct net_device *dev = mc->idev->dev;
 718         char buf[MAX_ADDR_LEN];
 719
 720         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 721             IPV6_ADDR_SCOPE_LINKLOCAL)
 722                 return;
 723
 724         spin_lock_bh(&mc->mca_lock);
 725         if (mc->mca_flags&MAF_LOADED) {
 726                 mc->mca_flags &= ~MAF_LOADED;
 727                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 728                         dev_mc_del(dev, buf);
 729         }
 730
 731         if (mc->mca_flags & MAF_NOREPORT)
 732                 goto done;
 733         spin_unlock_bh(&mc->mca_lock);
 734
 735         if (!mc->idev->dead)
 736                 igmp6_leave_group(mc);
 737
 738         spin_lock_bh(&mc->mca_lock);
 739         if (del_timer(&mc->mca_timer))
 740                 atomic_dec(&mc->mca_refcnt);
 741 done:
 742         ip6_mc_clear_src(mc);
 743         spin_unlock_bh(&mc->mca_lock);
 744 }
 745
 746 /*
 747  * deleted ifmcaddr6 manipulation
 748  */
 749 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 750 {
 751         struct ifmcaddr6 *pmc;
 752
 753         /* this is an "ifmcaddr6" for convenience; only the fields below
 754          * are actually used. In particular, the refcnt and users are not
 755          * used for management of the delete list. Using the same structure
 756          * for deleted items allows change reports to use common code with
 757          * non-deleted or query-response MCA's.
 758          */
 759         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 760         if (!pmc)
 761                 return;
 762
 763         spin_lock_bh(&im->mca_lock);
 764         spin_lock_init(&pmc->mca_lock);
 765         pmc->idev = im->idev;
 766         in6_dev_hold(idev);
 767         pmc->mca_addr = im->mca_addr;
 768         pmc->mca_crcount = idev->mc_qrv;
 769         pmc->mca_sfmode = im->mca_sfmode;
 770         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 771                 struct ip6_sf_list *psf;
 772
 773                 pmc->mca_tomb = im->mca_tomb;
 774                 pmc->mca_sources = im->mca_sources;
 775                 im->mca_tomb = im->mca_sources = NULL;
 776                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
 777                         psf->sf_crcount = pmc->mca_crcount;
 778         }
 779         spin_unlock_bh(&im->mca_lock);
 780
 781         spin_lock_bh(&idev->mc_lock);
 782         pmc->next = idev->mc_tomb;
 783         idev->mc_tomb = pmc;
 784         spin_unlock_bh(&idev->mc_lock);
 785 }
 786
 787 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 788 {
 789         struct ifmcaddr6 *pmc, *pmc_prev;
 790         struct ip6_sf_list *psf, *psf_next;
 791
 792         spin_lock_bh(&idev->mc_lock);
 793         pmc_prev = NULL;
 794         for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
 795                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 796                         break;
 797                 pmc_prev = pmc;
 798         }
 799         if (pmc) {
 800                 if (pmc_prev)
 801                         pmc_prev->next = pmc->next;
 802                 else
 803                         idev->mc_tomb = pmc->next;
 804         }
 805         spin_unlock_bh(&idev->mc_lock);
 806
 807         if (pmc) {
 808                 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
 809                         psf_next = psf->sf_next;
 810                         kfree(psf);
 811                 }
 812                 in6_dev_put(pmc->idev);
 813                 kfree(pmc);
 814         }
 815 }
 816
 817 static void mld_clear_delrec(struct inet6_dev *idev)
 818 {
 819         struct ifmcaddr6 *pmc, *nextpmc;
 820
 821         spin_lock_bh(&idev->mc_lock);
 822         pmc = idev->mc_tomb;
 823         idev->mc_tomb = NULL;
 824         spin_unlock_bh(&idev->mc_lock);
 825
 826         for (; pmc; pmc = nextpmc) {
 827                 nextpmc = pmc->next;
 828                 ip6_mc_clear_src(pmc);
 829                 in6_dev_put(pmc->idev);
 830                 kfree(pmc);
 831         }
 832
 833         /* clear dead sources, too */
 834         read_lock_bh(&idev->lock);
 835         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
 836                 struct ip6_sf_list *psf, *psf_next;
 837
 838                 spin_lock_bh(&pmc->mca_lock);
 839                 psf = pmc->mca_tomb;
 840                 pmc->mca_tomb = NULL;
 841                 spin_unlock_bh(&pmc->mca_lock);
 842                 for (; psf; psf = psf_next) {
 843                         psf_next = psf->sf_next;
 844                         kfree(psf);
 845                 }
 846         }
 847         read_unlock_bh(&idev->lock);
 848 }
 849
 850
 851 /*
 852  *      device multicast group inc (add if not found)
 853  */
 854 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 855 {
 856         struct ifmcaddr6 *mc;
 857         struct inet6_dev *idev;
 858
 859         ASSERT_RTNL();
 860
 861         /* we need to take a reference on idev */
 862         idev = in6_dev_get(dev);
 863
 864         if (idev == NULL)
 865                 return -EINVAL;
 866
 867         write_lock_bh(&idev->lock);
 868         if (idev->dead) {
 869                 write_unlock_bh(&idev->lock);
 870                 in6_dev_put(idev);
 871                 return -ENODEV;
 872         }
 873
 874         for (mc = idev->mc_list; mc; mc = mc->next) {
 875                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 876                         mc->mca_users++;
 877                         write_unlock_bh(&idev->lock);
 878                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 879                                 NULL, 0);
 880                         in6_dev_put(idev);
 881                         return 0;
 882                 }
 883         }
 884
 885         /*
 886          *      not found: create a new one.
 887          */
 888
 889         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 890
 891         if (mc == NULL) {
 892                 write_unlock_bh(&idev->lock);
 893                 in6_dev_put(idev);
 894                 return -ENOMEM;
 895         }
 896
 897         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 898
 899         mc->mca_addr = *addr;
 900         mc->idev = idev; /* (reference taken) */
 901         mc->mca_users = 1;
 902         /* mca_stamp should be updated upon changes */
 903         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 904         atomic_set(&mc->mca_refcnt, 2);
 905         spin_lock_init(&mc->mca_lock);
 906
 907         /* initial mode is (EX, empty) */
 908         mc->mca_sfmode = MCAST_EXCLUDE;
 909         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 910
 911         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 912             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 913                 mc->mca_flags |= MAF_NOREPORT;
 914
 915         mc->next = idev->mc_list;
 916         idev->mc_list = mc;
 917         write_unlock_bh(&idev->lock);
 918
 919         mld_del_delrec(idev, &mc->mca_addr);
 920         igmp6_group_added(mc);
 921         ma_put(mc);
 922         return 0;
 923 }
 924
 925 /*
 926  *      device multicast group del
 927  */
 928 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 929 {
 930         struct ifmcaddr6 *ma, **map;
 931
 932         ASSERT_RTNL();
 933
 934         write_lock_bh(&idev->lock);
 935         for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
 936                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 937                         if (--ma->mca_users == 0) {
 938                                 *map = ma->next;
 939                                 write_unlock_bh(&idev->lock);
 940
 941                                 igmp6_group_dropped(ma);
 942
 943                                 ma_put(ma);
 944                                 return 0;
 945                         }
 946                         write_unlock_bh(&idev->lock);
 947                         return 0;
 948                 }
 949         }
 950         write_unlock_bh(&idev->lock);
 951
 952         return -ENOENT;
 953 }
 954
 955 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 956 {
 957         struct inet6_dev *idev;
 958         int err;
 959
 960         rcu_read_lock();
 961
 962         idev = __in6_dev_get(dev);
 963         if (!idev)
 964                 err = -ENODEV;
 965         else
 966                 err = __ipv6_dev_mc_dec(idev, addr);
 967
 968         rcu_read_unlock();
 969         return err;
 970 }
 971
 972 /*
 973  *      check if the interface/address pair is valid
 974  */
 975 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 976                          const struct in6_addr *src_addr)
 977 {
 978         struct inet6_dev *idev;
 979         struct ifmcaddr6 *mc;
 980         bool rv = false;
 981
 982         rcu_read_lock();
 983         idev = __in6_dev_get(dev);
 984         if (idev) {
 985                 read_lock_bh(&idev->lock);
 986                 for (mc = idev->mc_list; mc; mc = mc->next) {
 987                         if (ipv6_addr_equal(&mc->mca_addr, group))
 988                                 break;
 989                 }
 990                 if (mc) {
 991                         if (src_addr && !ipv6_addr_any(src_addr)) {
 992                                 struct ip6_sf_list *psf;
 993
 994                                 spin_lock_bh(&mc->mca_lock);
 995                                 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
 996                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 997                                                 break;
 998                                 }
 999                                 if (psf)
1000                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1001                                                 psf->sf_count[MCAST_EXCLUDE] !=
1002                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1003                                 else
1004                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1005                                 spin_unlock_bh(&mc->mca_lock);
1006                         } else
1007                                 rv = true; /* don't filter unspecified source */
1008                 }
1009                 read_unlock_bh(&idev->lock);
1010         }
1011         rcu_read_unlock();
1012         return rv;
1013 }
1014
1015 static void mld_gq_start_timer(struct inet6_dev *idev)
1016 {
1017         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1018
1019         idev->mc_gq_running = 1;
1020         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1021                 in6_dev_hold(idev);
1022 }
1023
1024 static void mld_gq_stop_timer(struct inet6_dev *idev)
1025 {
1026         idev->mc_gq_running = 0;
1027         if (del_timer(&idev->mc_gq_timer))
1028                 __in6_dev_put(idev);
1029 }
1030
1031 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1032 {
1033         unsigned long tv = prandom_u32() % delay;
1034
1035         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1036                 in6_dev_hold(idev);
1037 }
1038
1039 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1040 {
1041         idev->mc_ifc_count = 0;
1042         if (del_timer(&idev->mc_ifc_timer))
1043                 __in6_dev_put(idev);
1044 }
1045
1046 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1047 {
1048         unsigned long tv = prandom_u32() % delay;
1049
1050         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1051                 in6_dev_hold(idev);
1052 }
1053
1054 static void mld_dad_stop_timer(struct inet6_dev *idev)
1055 {
1056         if (del_timer(&idev->mc_dad_timer))
1057                 __in6_dev_put(idev);
1058 }
1059
1060 /*
1061  *      IGMP handling (alias multicast ICMPv6 messages)
1062  */
1063
1064 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1065 {
1066         unsigned long delay = resptime;
1067
1068         /* Do not start timer for these addresses */
1069         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1070             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1071                 return;
1072
1073         if (del_timer(&ma->mca_timer)) {
1074                 atomic_dec(&ma->mca_refcnt);
1075                 delay = ma->mca_timer.expires - jiffies;
1076         }
1077
1078         if (delay >= resptime)
1079                 delay = prandom_u32() % resptime;
1080
1081         ma->mca_timer.expires = jiffies + delay;
1082         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1083                 atomic_inc(&ma->mca_refcnt);
1084         ma->mca_flags |= MAF_TIMER_RUNNING;
1085 }
1086
1087 /* mark EXCLUDE-mode sources */
1088 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1089                              const struct in6_addr *srcs)
1090 {
1091         struct ip6_sf_list *psf;
1092         int i, scount;
1093
1094         scount = 0;
1095         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1096                 if (scount == nsrcs)
1097                         break;
1098                 for (i = 0; i < nsrcs; i++) {
1099                         /* skip inactive filters */
1100                         if (psf->sf_count[MCAST_INCLUDE] ||
1101                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1102                             psf->sf_count[MCAST_EXCLUDE])
1103                                 break;
1104                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1105                                 scount++;
1106                                 break;
1107                         }
1108                 }
1109         }
1110         pmc->mca_flags &= ~MAF_GSQUERY;
1111         if (scount == nsrcs)    /* all sources excluded */
1112                 return false;
1113         return true;
1114 }
1115
1116 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1117                             const struct in6_addr *srcs)
1118 {
1119         struct ip6_sf_list *psf;
1120         int i, scount;
1121
1122         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1123                 return mld_xmarksources(pmc, nsrcs, srcs);
1124
1125         /* mark INCLUDE-mode sources */
1126
1127         scount = 0;
1128         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1129                 if (scount == nsrcs)
1130                         break;
1131                 for (i = 0; i < nsrcs; i++) {
1132                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1133                                 psf->sf_gsresp = 1;
1134                                 scount++;
1135                                 break;
1136                         }
1137                 }
1138         }
1139         if (!scount) {
1140                 pmc->mca_flags &= ~MAF_GSQUERY;
1141                 return false;
1142         }
1143         pmc->mca_flags |= MAF_GSQUERY;
1144         return true;
1145 }
1146
1147 static int mld_force_mld_version(const struct inet6_dev *idev)
1148 {
1149         /* Normally, both are 0 here. If enforcement to a particular is
1150          * being used, individual device enforcement will have a lower
1151          * precedence over 'all' device (.../conf/all/force_mld_version).
1152          */
1153
1154         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1155                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1156         else
1157                 return idev->cnf.force_mld_version;
1158 }
1159
1160 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1161 {
1162         return mld_force_mld_version(idev) == 2;
1163 }
1164
1165 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1166 {
1167         return mld_force_mld_version(idev) == 1;
1168 }
1169
1170 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1171 {
1172         if (mld_in_v2_mode_only(idev))
1173                 return false;
1174         if (mld_in_v1_mode_only(idev))
1175                 return true;
1176         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1177                 return true;
1178
1179         return false;
1180 }
1181
1182 static void mld_set_v1_mode(struct inet6_dev *idev)
1183 {
1184         /* RFC3810, relevant sections:
1185          *  - 9.1. Robustness Variable
1186          *  - 9.2. Query Interval
1187          *  - 9.3. Query Response Interval
1188          *  - 9.12. Older Version Querier Present Timeout
1189          */
1190         unsigned long switchback;
1191
1192         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1193
1194         idev->mc_v1_seen = jiffies + switchback;
1195 }
1196
1197 static void mld_update_qrv(struct inet6_dev *idev,
1198                            const struct mld2_query *mlh2)
1199 {
1200         /* RFC3810, relevant sections:
1201          *  - 5.1.8. QRV (Querier's Robustness Variable)
1202          *  - 9.1. Robustness Variable
1203          */
1204
1205         /* The value of the Robustness Variable MUST NOT be zero,
1206          * and SHOULD NOT be one. Catch this here if we ever run
1207          * into such a case in future.
1208          */
1209         const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1210         WARN_ON(idev->mc_qrv == 0);
1211
1212         if (mlh2->mld2q_qrv > 0)
1213                 idev->mc_qrv = mlh2->mld2q_qrv;
1214
1215         if (unlikely(idev->mc_qrv < min_qrv)) {
1216                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1217                                      idev->mc_qrv, min_qrv);
1218                 idev->mc_qrv = min_qrv;
1219         }
1220 }
1221
1222 static void mld_update_qi(struct inet6_dev *idev,
1223                           const struct mld2_query *mlh2)
1224 {
1225         /* RFC3810, relevant sections:
1226          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1227          *  - 9.2. Query Interval
1228          *  - 9.12. Older Version Querier Present Timeout
1229          *    (the [Query Interval] in the last Query received)
1230          */
1231         unsigned long mc_qqi;
1232
1233         if (mlh2->mld2q_qqic < 128) {
1234                 mc_qqi = mlh2->mld2q_qqic;
1235         } else {
1236                 unsigned long mc_man, mc_exp;
1237
1238                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1239                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1240
1241                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1242         }
1243
1244         idev->mc_qi = mc_qqi * HZ;
1245 }
1246
1247 static void mld_update_qri(struct inet6_dev *idev,
1248                            const struct mld2_query *mlh2)
1249 {
1250         /* RFC3810, relevant sections:
1251          *  - 5.1.3. Maximum Response Code
1252          *  - 9.3. Query Response Interval
1253          */
1254         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1255 }
1256
1257 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1258                           unsigned long *max_delay)
1259 {
1260         unsigned long mldv1_md;
1261
1262         /* Ignore v1 queries */
1263         if (mld_in_v2_mode_only(idev))
1264                 return -EINVAL;
1265
1266         /* MLDv1 router present */
1267         mldv1_md = ntohs(mld->mld_maxdelay);
1268         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1269
1270         mld_set_v1_mode(idev);
1271
1272         /* cancel MLDv2 report timer */
1273         mld_gq_stop_timer(idev);
1274         /* cancel the interface change timer */
1275         mld_ifc_stop_timer(idev);
1276         /* clear deleted report items */
1277         mld_clear_delrec(idev);
1278
1279         return 0;
1280 }
1281
1282 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1283                           unsigned long *max_delay)
1284 {
1285         /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1286         if (mld_in_v1_mode(idev))
1287                 return -EINVAL;
1288
1289         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1290
1291         mld_update_qrv(idev, mld);
1292         mld_update_qi(idev, mld);
1293         mld_update_qri(idev, mld);
1294
1295         idev->mc_maxdelay = *max_delay;
1296
1297         return 0;
1298 }
1299
1300 /* called with rcu_read_lock() */
1301 int igmp6_event_query(struct sk_buff *skb)
1302 {
1303         struct mld2_query *mlh2 = NULL;
1304         struct ifmcaddr6 *ma;
1305         const struct in6_addr *group;
1306         unsigned long max_delay;
1307         struct inet6_dev *idev;
1308         struct mld_msg *mld;
1309         int group_type;
1310         int mark = 0;
1311         int len, err;
1312
1313         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1314                 return -EINVAL;
1315
1316         /* compute payload length excluding extension headers */
1317         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1318         len -= skb_network_header_len(skb);
1319
1320         /* RFC3810 6.2
1321          * Upon reception of an MLD message that contains a Query, the node
1322          * checks if the source address of the message is a valid link-local
1323          * address, if the Hop Limit is set to 1, and if the Router Alert
1324          * option is present in the Hop-By-Hop Options header of the IPv6
1325          * packet.  If any of these checks fails, the packet is dropped.
1326          */
1327         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1328             ipv6_hdr(skb)->hop_limit != 1 ||
1329             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1330             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1331                 return -EINVAL;
1332
1333         idev = __in6_dev_get(skb->dev);
1334         if (idev == NULL)
1335                 return 0;
1336
1337         mld = (struct mld_msg *)icmp6_hdr(skb);
1338         group = &mld->mld_mca;
1339         group_type = ipv6_addr_type(group);
1340
1341         if (group_type != IPV6_ADDR_ANY &&
1342             !(group_type&IPV6_ADDR_MULTICAST))
1343                 return -EINVAL;
1344
1345         if (len == MLD_V1_QUERY_LEN) {
1346                 err = mld_process_v1(idev, mld, &max_delay);
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         read_lock_bh(&idev->lock);
1382         if (group_type == IPV6_ADDR_ANY) {
1383                 for (ma = idev->mc_list; ma; ma = ma->next) {
1384                         spin_lock_bh(&ma->mca_lock);
1385                         igmp6_group_queried(ma, max_delay);
1386                         spin_unlock_bh(&ma->mca_lock);
1387                 }
1388         } else {
1389                 for (ma = idev->mc_list; ma; ma = ma->next) {
1390                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1391                                 continue;
1392                         spin_lock_bh(&ma->mca_lock);
1393                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1394                                 /* gsquery <- gsquery && mark */
1395                                 if (!mark)
1396                                         ma->mca_flags &= ~MAF_GSQUERY;
1397                         } else {
1398                                 /* gsquery <- mark */
1399                                 if (mark)
1400                                         ma->mca_flags |= MAF_GSQUERY;
1401                                 else
1402                                         ma->mca_flags &= ~MAF_GSQUERY;
1403                         }
1404                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1405                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1406                                 igmp6_group_queried(ma, max_delay);
1407                         spin_unlock_bh(&ma->mca_lock);
1408                         break;
1409                 }
1410         }
1411         read_unlock_bh(&idev->lock);
1412
1413         return 0;
1414 }
1415
1416 /* called with rcu_read_lock() */
1417 int igmp6_event_report(struct sk_buff *skb)
1418 {
1419         struct ifmcaddr6 *ma;
1420         struct inet6_dev *idev;
1421         struct mld_msg *mld;
1422         int addr_type;
1423
1424         /* Our own report looped back. Ignore it. */
1425         if (skb->pkt_type == PACKET_LOOPBACK)
1426                 return 0;
1427
1428         /* send our report if the MC router may not have heard this report */
1429         if (skb->pkt_type != PACKET_MULTICAST &&
1430             skb->pkt_type != PACKET_BROADCAST)
1431                 return 0;
1432
1433         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1434                 return -EINVAL;
1435
1436         mld = (struct mld_msg *)icmp6_hdr(skb);
1437
1438         /* Drop reports with not link local source */
1439         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1440         if (addr_type != IPV6_ADDR_ANY &&
1441             !(addr_type&IPV6_ADDR_LINKLOCAL))
1442                 return -EINVAL;
1443
1444         idev = __in6_dev_get(skb->dev);
1445         if (idev == NULL)
1446                 return -ENODEV;
1447
1448         /*
1449          *      Cancel the timer for this group
1450          */
1451
1452         read_lock_bh(&idev->lock);
1453         for (ma = idev->mc_list; ma; ma = ma->next) {
1454                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1455                         spin_lock(&ma->mca_lock);
1456                         if (del_timer(&ma->mca_timer))
1457                                 atomic_dec(&ma->mca_refcnt);
1458                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1459                         spin_unlock(&ma->mca_lock);
1460                         break;
1461                 }
1462         }
1463         read_unlock_bh(&idev->lock);
1464         return 0;
1465 }
1466
1467 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1468                   int gdeleted, int sdeleted)
1469 {
1470         switch (type) {
1471         case MLD2_MODE_IS_INCLUDE:
1472         case MLD2_MODE_IS_EXCLUDE:
1473                 if (gdeleted || sdeleted)
1474                         return false;
1475                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1476                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1477                                 return true;
1478                         /* don't include if this source is excluded
1479                          * in all filters
1480                          */
1481                         if (psf->sf_count[MCAST_INCLUDE])
1482                                 return type == MLD2_MODE_IS_INCLUDE;
1483                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1484                                 psf->sf_count[MCAST_EXCLUDE];
1485                 }
1486                 return false;
1487         case MLD2_CHANGE_TO_INCLUDE:
1488                 if (gdeleted || sdeleted)
1489                         return false;
1490                 return psf->sf_count[MCAST_INCLUDE] != 0;
1491         case MLD2_CHANGE_TO_EXCLUDE:
1492                 if (gdeleted || sdeleted)
1493                         return false;
1494                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1495                     psf->sf_count[MCAST_INCLUDE])
1496                         return false;
1497                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1498                         psf->sf_count[MCAST_EXCLUDE];
1499         case MLD2_ALLOW_NEW_SOURCES:
1500                 if (gdeleted || !psf->sf_crcount)
1501                         return false;
1502                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1503         case MLD2_BLOCK_OLD_SOURCES:
1504                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1505                         return gdeleted || (psf->sf_crcount && sdeleted);
1506                 return psf->sf_crcount && !gdeleted && !sdeleted;
1507         }
1508         return false;
1509 }
1510
1511 static int
1512 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1513 {
1514         struct ip6_sf_list *psf;
1515         int scount = 0;
1516
1517         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1518                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1519                         continue;
1520                 scount++;
1521         }
1522         return scount;
1523 }
1524
1525 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1526                        struct net_device *dev,
1527                        const struct in6_addr *saddr,
1528                        const struct in6_addr *daddr,
1529                        int proto, int len)
1530 {
1531         struct ipv6hdr *hdr;
1532
1533         skb->protocol = htons(ETH_P_IPV6);
1534         skb->dev = dev;
1535
1536         skb_reset_network_header(skb);
1537         skb_put(skb, sizeof(struct ipv6hdr));
1538         hdr = ipv6_hdr(skb);
1539
1540         ip6_flow_hdr(hdr, 0, 0);
1541
1542         hdr->payload_len = htons(len);
1543         hdr->nexthdr = proto;
1544         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1545
1546         hdr->saddr = *saddr;
1547         hdr->daddr = *daddr;
1548 }
1549
1550 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1551 {
1552         struct net_device *dev = idev->dev;
1553         struct net *net = dev_net(dev);
1554         struct sock *sk = net->ipv6.igmp_sk;
1555         struct sk_buff *skb;
1556         struct mld2_report *pmr;
1557         struct in6_addr addr_buf;
1558         const struct in6_addr *saddr;
1559         int hlen = LL_RESERVED_SPACE(dev);
1560         int tlen = dev->needed_tailroom;
1561         int err;
1562         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1563                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1564                      IPV6_TLV_PADN, 0 };
1565
1566         /* we assume size > sizeof(ra) here */
1567         size += hlen + tlen;
1568         /* limit our allocations to order-0 page */
1569         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1570         skb = sock_alloc_send_skb(sk, size, 1, &err);
1571
1572         if (!skb)
1573                 return NULL;
1574
1575         skb->priority = TC_PRIO_CONTROL;
1576         skb_reserve(skb, hlen);
1577
1578         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1579                 /* <draft-ietf-magma-mld-source-05.txt>:
1580                  * use unspecified address as the source address
1581                  * when a valid link-local address is not available.
1582                  */
1583                 saddr = &in6addr_any;
1584         } else
1585                 saddr = &addr_buf;
1586
1587         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1588
1589         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1590
1591         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1592         skb_put(skb, sizeof(*pmr));
1593         pmr = (struct mld2_report *)skb_transport_header(skb);
1594         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1595         pmr->mld2r_resv1 = 0;
1596         pmr->mld2r_cksum = 0;
1597         pmr->mld2r_resv2 = 0;
1598         pmr->mld2r_ngrec = 0;
1599         return skb;
1600 }
1601
1602 static void mld_sendpack(struct sk_buff *skb)
1603 {
1604         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1605         struct mld2_report *pmr =
1606                               (struct mld2_report *)skb_transport_header(skb);
1607         int payload_len, mldlen;
1608         struct inet6_dev *idev;
1609         struct net *net = dev_net(skb->dev);
1610         int err;
1611         struct flowi6 fl6;
1612         struct dst_entry *dst;
1613
1614         rcu_read_lock();
1615         idev = __in6_dev_get(skb->dev);
1616         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1617
1618         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1619                 sizeof(*pip6);
1620         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1621         pip6->payload_len = htons(payload_len);
1622
1623         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1624                                            IPPROTO_ICMPV6,
1625                                            csum_partial(skb_transport_header(skb),
1626                                                         mldlen, 0));
1627
1628         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1629                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1630                          skb->dev->ifindex);
1631         dst = icmp6_dst_alloc(skb->dev, &fl6);
1632
1633         err = 0;
1634         if (IS_ERR(dst)) {
1635                 err = PTR_ERR(dst);
1636                 dst = NULL;
1637         }
1638         skb_dst_set(skb, dst);
1639         if (err)
1640                 goto err_out;
1641
1642         payload_len = skb->len;
1643
1644         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1645                       dst_output);
1646 out:
1647         if (!err) {
1648                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1649                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1650                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1651         } else {
1652                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1653         }
1654
1655         rcu_read_unlock();
1656         return;
1657
1658 err_out:
1659         kfree_skb(skb);
1660         goto out;
1661 }
1662
1663 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1664 {
1665         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1666 }
1667
1668 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1669         int type, struct mld2_grec **ppgr)
1670 {
1671         struct net_device *dev = pmc->idev->dev;
1672         struct mld2_report *pmr;
1673         struct mld2_grec *pgr;
1674
1675         if (!skb)
1676                 skb = mld_newpack(pmc->idev, dev->mtu);
1677         if (!skb)
1678                 return NULL;
1679         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1680         pgr->grec_type = type;
1681         pgr->grec_auxwords = 0;
1682         pgr->grec_nsrcs = 0;
1683         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1684         pmr = (struct mld2_report *)skb_transport_header(skb);
1685         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1686         *ppgr = pgr;
1687         return skb;
1688 }
1689
1690 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1691         skb_tailroom(skb)) : 0)
1692
1693 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1694         int type, int gdeleted, int sdeleted, int crsend)
1695 {
1696         struct inet6_dev *idev = pmc->idev;
1697         struct net_device *dev = idev->dev;
1698         struct mld2_report *pmr;
1699         struct mld2_grec *pgr = NULL;
1700         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1701         int scount, stotal, first, isquery, truncate;
1702
1703         if (pmc->mca_flags & MAF_NOREPORT)
1704                 return skb;
1705
1706         isquery = type == MLD2_MODE_IS_INCLUDE ||
1707                   type == MLD2_MODE_IS_EXCLUDE;
1708         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1709                     type == MLD2_CHANGE_TO_EXCLUDE;
1710
1711         stotal = scount = 0;
1712
1713         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1714
1715         if (!*psf_list)
1716                 goto empty_source;
1717
1718         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1719
1720         /* EX and TO_EX get a fresh packet, if needed */
1721         if (truncate) {
1722                 if (pmr && pmr->mld2r_ngrec &&
1723                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1724                         if (skb)
1725                                 mld_sendpack(skb);
1726                         skb = mld_newpack(idev, dev->mtu);
1727                 }
1728         }
1729         first = 1;
1730         psf_prev = NULL;
1731         for (psf = *psf_list; psf; psf = psf_next) {
1732                 struct in6_addr *psrc;
1733
1734                 psf_next = psf->sf_next;
1735
1736                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1737                         psf_prev = psf;
1738                         continue;
1739                 }
1740
1741                 /* clear marks on query responses */
1742                 if (isquery)
1743                         psf->sf_gsresp = 0;
1744
1745                 if (AVAILABLE(skb) < sizeof(*psrc) +
1746                     first*sizeof(struct mld2_grec)) {
1747                         if (truncate && !first)
1748                                 break;   /* truncate these */
1749                         if (pgr)
1750                                 pgr->grec_nsrcs = htons(scount);
1751                         if (skb)
1752                                 mld_sendpack(skb);
1753                         skb = mld_newpack(idev, dev->mtu);
1754                         first = 1;
1755                         scount = 0;
1756                 }
1757                 if (first) {
1758                         skb = add_grhead(skb, pmc, type, &pgr);
1759                         first = 0;
1760                 }
1761                 if (!skb)
1762                         return NULL;
1763                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1764                 *psrc = psf->sf_addr;
1765                 scount++; stotal++;
1766                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1767                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1768                         psf->sf_crcount--;
1769                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1770                                 if (psf_prev)
1771                                         psf_prev->sf_next = psf->sf_next;
1772                                 else
1773                                         *psf_list = psf->sf_next;
1774                                 kfree(psf);
1775                                 continue;
1776                         }
1777                 }
1778                 psf_prev = psf;
1779         }
1780
1781 empty_source:
1782         if (!stotal) {
1783                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1784                     type == MLD2_BLOCK_OLD_SOURCES)
1785                         return skb;
1786                 if (pmc->mca_crcount || isquery || crsend) {
1787                         /* make sure we have room for group header */
1788                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1789                                 mld_sendpack(skb);
1790                                 skb = NULL; /* add_grhead will get a new one */
1791                         }
1792                         skb = add_grhead(skb, pmc, type, &pgr);
1793                 }
1794         }
1795         if (pgr)
1796                 pgr->grec_nsrcs = htons(scount);
1797
1798         if (isquery)
1799                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1800         return skb;
1801 }
1802
1803 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1804 {
1805         struct sk_buff *skb = NULL;
1806         int type;
1807
1808         read_lock_bh(&idev->lock);
1809         if (!pmc) {
1810                 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1811                         if (pmc->mca_flags & MAF_NOREPORT)
1812                                 continue;
1813                         spin_lock_bh(&pmc->mca_lock);
1814                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1815                                 type = MLD2_MODE_IS_EXCLUDE;
1816                         else
1817                                 type = MLD2_MODE_IS_INCLUDE;
1818                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1819                         spin_unlock_bh(&pmc->mca_lock);
1820                 }
1821         } else {
1822                 spin_lock_bh(&pmc->mca_lock);
1823                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1824                         type = MLD2_MODE_IS_EXCLUDE;
1825                 else
1826                         type = MLD2_MODE_IS_INCLUDE;
1827                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1828                 spin_unlock_bh(&pmc->mca_lock);
1829         }
1830         read_unlock_bh(&idev->lock);
1831         if (skb)
1832                 mld_sendpack(skb);
1833 }
1834
1835 /*
1836  * remove zero-count source records from a source filter list
1837  */
1838 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1839 {
1840         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1841
1842         psf_prev = NULL;
1843         for (psf = *ppsf; psf; psf = psf_next) {
1844                 psf_next = psf->sf_next;
1845                 if (psf->sf_crcount == 0) {
1846                         if (psf_prev)
1847                                 psf_prev->sf_next = psf->sf_next;
1848                         else
1849                                 *ppsf = psf->sf_next;
1850                         kfree(psf);
1851                 } else
1852                         psf_prev = psf;
1853         }
1854 }
1855
1856 static void mld_send_cr(struct inet6_dev *idev)
1857 {
1858         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1859         struct sk_buff *skb = NULL;
1860         int type, dtype;
1861
1862         read_lock_bh(&idev->lock);
1863         spin_lock(&idev->mc_lock);
1864
1865         /* deleted MCA's */
1866         pmc_prev = NULL;
1867         for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1868                 pmc_next = pmc->next;
1869                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1870                         type = MLD2_BLOCK_OLD_SOURCES;
1871                         dtype = MLD2_BLOCK_OLD_SOURCES;
1872                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1873                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1874                 }
1875                 if (pmc->mca_crcount) {
1876                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1877                                 type = MLD2_CHANGE_TO_INCLUDE;
1878                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1879                         }
1880                         pmc->mca_crcount--;
1881                         if (pmc->mca_crcount == 0) {
1882                                 mld_clear_zeros(&pmc->mca_tomb);
1883                                 mld_clear_zeros(&pmc->mca_sources);
1884                         }
1885                 }
1886                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1887                     !pmc->mca_sources) {
1888                         if (pmc_prev)
1889                                 pmc_prev->next = pmc_next;
1890                         else
1891                                 idev->mc_tomb = pmc_next;
1892                         in6_dev_put(pmc->idev);
1893                         kfree(pmc);
1894                 } else
1895                         pmc_prev = pmc;
1896         }
1897         spin_unlock(&idev->mc_lock);
1898
1899         /* change recs */
1900         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1901                 spin_lock_bh(&pmc->mca_lock);
1902                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1903                         type = MLD2_BLOCK_OLD_SOURCES;
1904                         dtype = MLD2_ALLOW_NEW_SOURCES;
1905                 } else {
1906                         type = MLD2_ALLOW_NEW_SOURCES;
1907                         dtype = MLD2_BLOCK_OLD_SOURCES;
1908                 }
1909                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1910                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1911
1912                 /* filter mode changes */
1913                 if (pmc->mca_crcount) {
1914                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1915                                 type = MLD2_CHANGE_TO_EXCLUDE;
1916                         else
1917                                 type = MLD2_CHANGE_TO_INCLUDE;
1918                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1919                         pmc->mca_crcount--;
1920                 }
1921                 spin_unlock_bh(&pmc->mca_lock);
1922         }
1923         read_unlock_bh(&idev->lock);
1924         if (!skb)
1925                 return;
1926         (void) mld_sendpack(skb);
1927 }
1928
1929 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1930 {
1931         struct net *net = dev_net(dev);
1932         struct sock *sk = net->ipv6.igmp_sk;
1933         struct inet6_dev *idev;
1934         struct sk_buff *skb;
1935         struct mld_msg *hdr;
1936         const struct in6_addr *snd_addr, *saddr;
1937         struct in6_addr addr_buf;
1938         int hlen = LL_RESERVED_SPACE(dev);
1939         int tlen = dev->needed_tailroom;
1940         int err, len, payload_len, full_len;
1941         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1942                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1943                      IPV6_TLV_PADN, 0 };
1944         struct flowi6 fl6;
1945         struct dst_entry *dst;
1946
1947         if (type == ICMPV6_MGM_REDUCTION)
1948                 snd_addr = &in6addr_linklocal_allrouters;
1949         else
1950                 snd_addr = addr;
1951
1952         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1953         payload_len = len + sizeof(ra);
1954         full_len = sizeof(struct ipv6hdr) + payload_len;
1955
1956         rcu_read_lock();
1957         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1958                       IPSTATS_MIB_OUT, full_len);
1959         rcu_read_unlock();
1960
1961         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1962
1963         if (skb == NULL) {
1964                 rcu_read_lock();
1965                 IP6_INC_STATS(net, __in6_dev_get(dev),
1966                               IPSTATS_MIB_OUTDISCARDS);
1967                 rcu_read_unlock();
1968                 return;
1969         }
1970         skb->priority = TC_PRIO_CONTROL;
1971         skb_reserve(skb, hlen);
1972
1973         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1974                 /* <draft-ietf-magma-mld-source-05.txt>:
1975                  * use unspecified address as the source address
1976                  * when a valid link-local address is not available.
1977                  */
1978                 saddr = &in6addr_any;
1979         } else
1980                 saddr = &addr_buf;
1981
1982         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1983
1984         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1985
1986         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1987         memset(hdr, 0, sizeof(struct mld_msg));
1988         hdr->mld_type = type;
1989         hdr->mld_mca = *addr;
1990
1991         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1992                                          IPPROTO_ICMPV6,
1993                                          csum_partial(hdr, len, 0));
1994
1995         rcu_read_lock();
1996         idev = __in6_dev_get(skb->dev);
1997
1998         icmpv6_flow_init(sk, &fl6, type,
1999                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2000                          skb->dev->ifindex);
2001         dst = icmp6_dst_alloc(skb->dev, &fl6);
2002         if (IS_ERR(dst)) {
2003                 err = PTR_ERR(dst);
2004                 goto err_out;
2005         }
2006
2007         skb_dst_set(skb, dst);
2008         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
2009                       dst_output);
2010 out:
2011         if (!err) {
2012                 ICMP6MSGOUT_INC_STATS(net, idev, type);
2013                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2014                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
2015         } else
2016                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2017
2018         rcu_read_unlock();
2019         return;
2020
2021 err_out:
2022         kfree_skb(skb);
2023         goto out;
2024 }
2025
2026 static void mld_send_initial_cr(struct inet6_dev *idev)
2027 {
2028         struct sk_buff *skb;
2029         struct ifmcaddr6 *pmc;
2030         int type;
2031
2032         if (mld_in_v1_mode(idev))
2033                 return;
2034
2035         skb = NULL;
2036         read_lock_bh(&idev->lock);
2037         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2038                 spin_lock_bh(&pmc->mca_lock);
2039                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2040                         type = MLD2_CHANGE_TO_EXCLUDE;
2041                 else
2042                         type = MLD2_CHANGE_TO_INCLUDE;
2043                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2044                 spin_unlock_bh(&pmc->mca_lock);
2045         }
2046         read_unlock_bh(&idev->lock);
2047         if (skb)
2048                 mld_sendpack(skb);
2049 }
2050
2051 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2052 {
2053         idev->mc_dad_count = idev->mc_qrv;
2054         if (idev->mc_dad_count) {
2055                 mld_send_initial_cr(idev);
2056                 idev->mc_dad_count--;
2057                 if (idev->mc_dad_count)
2058                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2059         }
2060 }
2061
2062 static void mld_dad_timer_expire(unsigned long data)
2063 {
2064         struct inet6_dev *idev = (struct inet6_dev *)data;
2065
2066         mld_send_initial_cr(idev);
2067         if (idev->mc_dad_count) {
2068                 idev->mc_dad_count--;
2069                 if (idev->mc_dad_count)
2070                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2071         }
2072         in6_dev_put(idev);
2073 }
2074
2075 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2076         const struct in6_addr *psfsrc)
2077 {
2078         struct ip6_sf_list *psf, *psf_prev;
2079         int rv = 0;
2080
2081         psf_prev = NULL;
2082         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2083                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2084                         break;
2085                 psf_prev = psf;
2086         }
2087         if (!psf || psf->sf_count[sfmode] == 0) {
2088                 /* source filter not found, or count wrong =>  bug */
2089                 return -ESRCH;
2090         }
2091         psf->sf_count[sfmode]--;
2092         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2093                 struct inet6_dev *idev = pmc->idev;
2094
2095                 /* no more filters for this source */
2096                 if (psf_prev)
2097                         psf_prev->sf_next = psf->sf_next;
2098                 else
2099                         pmc->mca_sources = psf->sf_next;
2100                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2101                     !mld_in_v1_mode(idev)) {
2102                         psf->sf_crcount = idev->mc_qrv;
2103                         psf->sf_next = pmc->mca_tomb;
2104                         pmc->mca_tomb = psf;
2105                         rv = 1;
2106                 } else
2107                         kfree(psf);
2108         }
2109         return rv;
2110 }
2111
2112 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2113                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2114                           int delta)
2115 {
2116         struct ifmcaddr6 *pmc;
2117         int     changerec = 0;
2118         int     i, err;
2119
2120         if (!idev)
2121                 return -ENODEV;
2122         read_lock_bh(&idev->lock);
2123         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2124                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2125                         break;
2126         }
2127         if (!pmc) {
2128                 /* MCA not found?? bug */
2129                 read_unlock_bh(&idev->lock);
2130                 return -ESRCH;
2131         }
2132         spin_lock_bh(&pmc->mca_lock);
2133         sf_markstate(pmc);
2134         if (!delta) {
2135                 if (!pmc->mca_sfcount[sfmode]) {
2136                         spin_unlock_bh(&pmc->mca_lock);
2137                         read_unlock_bh(&idev->lock);
2138                         return -EINVAL;
2139                 }
2140                 pmc->mca_sfcount[sfmode]--;
2141         }
2142         err = 0;
2143         for (i = 0; i < sfcount; i++) {
2144                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2145
2146                 changerec |= rv > 0;
2147                 if (!err && rv < 0)
2148                         err = rv;
2149         }
2150         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2151             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2152             pmc->mca_sfcount[MCAST_INCLUDE]) {
2153                 struct ip6_sf_list *psf;
2154
2155                 /* filter mode change */
2156                 pmc->mca_sfmode = MCAST_INCLUDE;
2157                 pmc->mca_crcount = idev->mc_qrv;
2158                 idev->mc_ifc_count = pmc->mca_crcount;
2159                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2160                         psf->sf_crcount = 0;
2161                 mld_ifc_event(pmc->idev);
2162         } else if (sf_setstate(pmc) || changerec)
2163                 mld_ifc_event(pmc->idev);
2164         spin_unlock_bh(&pmc->mca_lock);
2165         read_unlock_bh(&idev->lock);
2166         return err;
2167 }
2168
2169 /*
2170  * Add multicast single-source filter to the interface list
2171  */
2172 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2173         const struct in6_addr *psfsrc)
2174 {
2175         struct ip6_sf_list *psf, *psf_prev;
2176
2177         psf_prev = NULL;
2178         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2179                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2180                         break;
2181                 psf_prev = psf;
2182         }
2183         if (!psf) {
2184                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2185                 if (!psf)
2186                         return -ENOBUFS;
2187
2188                 psf->sf_addr = *psfsrc;
2189                 if (psf_prev) {
2190                         psf_prev->sf_next = psf;
2191                 } else
2192                         pmc->mca_sources = psf;
2193         }
2194         psf->sf_count[sfmode]++;
2195         return 0;
2196 }
2197
2198 static void sf_markstate(struct ifmcaddr6 *pmc)
2199 {
2200         struct ip6_sf_list *psf;
2201         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2202
2203         for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2204                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2205                         psf->sf_oldin = mca_xcount ==
2206                                 psf->sf_count[MCAST_EXCLUDE] &&
2207                                 !psf->sf_count[MCAST_INCLUDE];
2208                 } else
2209                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2210 }
2211
2212 static int sf_setstate(struct ifmcaddr6 *pmc)
2213 {
2214         struct ip6_sf_list *psf, *dpsf;
2215         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2216         int qrv = pmc->idev->mc_qrv;
2217         int new_in, rv;
2218
2219         rv = 0;
2220         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2221                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2222                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2223                                 !psf->sf_count[MCAST_INCLUDE];
2224                 } else
2225                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2226                 if (new_in) {
2227                         if (!psf->sf_oldin) {
2228                                 struct ip6_sf_list *prev = NULL;
2229
2230                                 for (dpsf = pmc->mca_tomb; dpsf;
2231                                      dpsf = dpsf->sf_next) {
2232                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2233                                             &psf->sf_addr))
2234                                                 break;
2235                                         prev = dpsf;
2236                                 }
2237                                 if (dpsf) {
2238                                         if (prev)
2239                                                 prev->sf_next = dpsf->sf_next;
2240                                         else
2241                                                 pmc->mca_tomb = dpsf->sf_next;
2242                                         kfree(dpsf);
2243                                 }
2244                                 psf->sf_crcount = qrv;
2245                                 rv++;
2246                         }
2247                 } else if (psf->sf_oldin) {
2248                         psf->sf_crcount = 0;
2249                         /*
2250                          * add or update "delete" records if an active filter
2251                          * is now inactive
2252                          */
2253                         for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2254                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2255                                     &psf->sf_addr))
2256                                         break;
2257                         if (!dpsf) {
2258                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2259                                 if (!dpsf)
2260                                         continue;
2261                                 *dpsf = *psf;
2262                                 /* pmc->mca_lock held by callers */
2263                                 dpsf->sf_next = pmc->mca_tomb;
2264                                 pmc->mca_tomb = dpsf;
2265                         }
2266                         dpsf->sf_crcount = qrv;
2267                         rv++;
2268                 }
2269         }
2270         return rv;
2271 }
2272
2273 /*
2274  * Add multicast source filter list to the interface list
2275  */
2276 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2277                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2278                           int delta)
2279 {
2280         struct ifmcaddr6 *pmc;
2281         int     isexclude;
2282         int     i, err;
2283
2284         if (!idev)
2285                 return -ENODEV;
2286         read_lock_bh(&idev->lock);
2287         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2288                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2289                         break;
2290         }
2291         if (!pmc) {
2292                 /* MCA not found?? bug */
2293                 read_unlock_bh(&idev->lock);
2294                 return -ESRCH;
2295         }
2296         spin_lock_bh(&pmc->mca_lock);
2297
2298         sf_markstate(pmc);
2299         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2300         if (!delta)
2301                 pmc->mca_sfcount[sfmode]++;
2302         err = 0;
2303         for (i = 0; i < sfcount; i++) {
2304                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2305                 if (err)
2306                         break;
2307         }
2308         if (err) {
2309                 int j;
2310
2311                 if (!delta)
2312                         pmc->mca_sfcount[sfmode]--;
2313                 for (j = 0; j < i; j++)
2314                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2315         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2316                 struct ip6_sf_list *psf;
2317
2318                 /* filter mode change */
2319                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2320                         pmc->mca_sfmode = MCAST_EXCLUDE;
2321                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2322                         pmc->mca_sfmode = MCAST_INCLUDE;
2323                 /* else no filters; keep old mode for reports */
2324
2325                 pmc->mca_crcount = idev->mc_qrv;
2326                 idev->mc_ifc_count = pmc->mca_crcount;
2327                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2328                         psf->sf_crcount = 0;
2329                 mld_ifc_event(idev);
2330         } else if (sf_setstate(pmc))
2331                 mld_ifc_event(idev);
2332         spin_unlock_bh(&pmc->mca_lock);
2333         read_unlock_bh(&idev->lock);
2334         return err;
2335 }
2336
2337 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2338 {
2339         struct ip6_sf_list *psf, *nextpsf;
2340
2341         for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2342                 nextpsf = psf->sf_next;
2343                 kfree(psf);
2344         }
2345         pmc->mca_tomb = NULL;
2346         for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2347                 nextpsf = psf->sf_next;
2348                 kfree(psf);
2349         }
2350         pmc->mca_sources = NULL;
2351         pmc->mca_sfmode = MCAST_EXCLUDE;
2352         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2353         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2354 }
2355
2356
2357 static void igmp6_join_group(struct ifmcaddr6 *ma)
2358 {
2359         unsigned long delay;
2360
2361         if (ma->mca_flags & MAF_NOREPORT)
2362                 return;
2363
2364         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2365
2366         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2367
2368         spin_lock_bh(&ma->mca_lock);
2369         if (del_timer(&ma->mca_timer)) {
2370                 atomic_dec(&ma->mca_refcnt);
2371                 delay = ma->mca_timer.expires - jiffies;
2372         }
2373
2374         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2375                 atomic_inc(&ma->mca_refcnt);
2376         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2377         spin_unlock_bh(&ma->mca_lock);
2378 }
2379
2380 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2381                             struct inet6_dev *idev)
2382 {
2383         int err;
2384
2385         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2386          * so no other readers or writers of iml or its sflist
2387          */
2388         if (!iml->sflist) {
2389                 /* any-source empty exclude case */
2390                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2391         }
2392         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2393                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2394         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2395         iml->sflist = NULL;
2396         return err;
2397 }
2398
2399 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2400 {
2401         if (mld_in_v1_mode(ma->idev)) {
2402                 if (ma->mca_flags & MAF_LAST_REPORTER)
2403                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2404                                 ICMPV6_MGM_REDUCTION);
2405         } else {
2406                 mld_add_delrec(ma->idev, ma);
2407                 mld_ifc_event(ma->idev);
2408         }
2409 }
2410
2411 static void mld_gq_timer_expire(unsigned long data)
2412 {
2413         struct inet6_dev *idev = (struct inet6_dev *)data;
2414
2415         idev->mc_gq_running = 0;
2416         mld_send_report(idev, NULL);
2417         in6_dev_put(idev);
2418 }
2419
2420 static void mld_ifc_timer_expire(unsigned long data)
2421 {
2422         struct inet6_dev *idev = (struct inet6_dev *)data;
2423
2424         mld_send_cr(idev);
2425         if (idev->mc_ifc_count) {
2426                 idev->mc_ifc_count--;
2427                 if (idev->mc_ifc_count)
2428                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2429         }
2430         in6_dev_put(idev);
2431 }
2432
2433 static void mld_ifc_event(struct inet6_dev *idev)
2434 {
2435         if (mld_in_v1_mode(idev))
2436                 return;
2437         idev->mc_ifc_count = idev->mc_qrv;
2438         mld_ifc_start_timer(idev, 1);
2439 }
2440
2441
2442 static void igmp6_timer_handler(unsigned long data)
2443 {
2444         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2445
2446         if (mld_in_v1_mode(ma->idev))
2447                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2448         else
2449                 mld_send_report(ma->idev, ma);
2450
2451         spin_lock(&ma->mca_lock);
2452         ma->mca_flags |=  MAF_LAST_REPORTER;
2453         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2454         spin_unlock(&ma->mca_lock);
2455         ma_put(ma);
2456 }
2457
2458 /* Device changing type */
2459
2460 void ipv6_mc_unmap(struct inet6_dev *idev)
2461 {
2462         struct ifmcaddr6 *i;
2463
2464         /* Install multicast list, except for all-nodes (already installed) */
2465
2466         read_lock_bh(&idev->lock);
2467         for (i = idev->mc_list; i; i = i->next)
2468                 igmp6_group_dropped(i);
2469         read_unlock_bh(&idev->lock);
2470 }
2471
2472 void ipv6_mc_remap(struct inet6_dev *idev)
2473 {
2474         ipv6_mc_up(idev);
2475 }
2476
2477 /* Device going down */
2478
2479 void ipv6_mc_down(struct inet6_dev *idev)
2480 {
2481         struct ifmcaddr6 *i;
2482
2483         /* Withdraw multicast list */
2484
2485         read_lock_bh(&idev->lock);
2486         mld_ifc_stop_timer(idev);
2487         mld_gq_stop_timer(idev);
2488         mld_dad_stop_timer(idev);
2489
2490         for (i = idev->mc_list; i; i = i->next)
2491                 igmp6_group_dropped(i);
2492         read_unlock_bh(&idev->lock);
2493
2494         mld_clear_delrec(idev);
2495 }
2496
2497 static void ipv6_mc_reset(struct inet6_dev *idev)
2498 {
2499         idev->mc_qrv = sysctl_mld_qrv;
2500         idev->mc_qi = MLD_QI_DEFAULT;
2501         idev->mc_qri = MLD_QRI_DEFAULT;
2502         idev->mc_v1_seen = 0;
2503         idev->mc_maxdelay = unsolicited_report_interval(idev);
2504 }
2505
2506 /* Device going up */
2507
2508 void ipv6_mc_up(struct inet6_dev *idev)
2509 {
2510         struct ifmcaddr6 *i;
2511
2512         /* Install multicast list, except for all-nodes (already installed) */
2513
2514         read_lock_bh(&idev->lock);
2515         ipv6_mc_reset(idev);
2516         for (i = idev->mc_list; i; i = i->next)
2517                 igmp6_group_added(i);
2518         read_unlock_bh(&idev->lock);
2519 }
2520
2521 /* IPv6 device initialization. */
2522
2523 void ipv6_mc_init_dev(struct inet6_dev *idev)
2524 {
2525         write_lock_bh(&idev->lock);
2526         spin_lock_init(&idev->mc_lock);
2527         idev->mc_gq_running = 0;
2528         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2529                         (unsigned long)idev);
2530         idev->mc_tomb = NULL;
2531         idev->mc_ifc_count = 0;
2532         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2533                         (unsigned long)idev);
2534         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2535                     (unsigned long)idev);
2536         ipv6_mc_reset(idev);
2537         write_unlock_bh(&idev->lock);
2538 }
2539
2540 /*
2541  *      Device is about to be destroyed: clean up.
2542  */
2543
2544 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2545 {
2546         struct ifmcaddr6 *i;
2547
2548         /* Deactivate timers */
2549         ipv6_mc_down(idev);
2550
2551         /* Delete all-nodes address. */
2552         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2553          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2554          * fail.
2555          */
2556         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2557
2558         if (idev->cnf.forwarding)
2559                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2560
2561         write_lock_bh(&idev->lock);
2562         while ((i = idev->mc_list) != NULL) {
2563                 idev->mc_list = i->next;
2564                 write_unlock_bh(&idev->lock);
2565
2566                 igmp6_group_dropped(i);
2567                 ma_put(i);
2568
2569                 write_lock_bh(&idev->lock);
2570         }
2571         write_unlock_bh(&idev->lock);
2572 }
2573
2574 #ifdef CONFIG_PROC_FS
2575 struct igmp6_mc_iter_state {
2576         struct seq_net_private p;
2577         struct net_device *dev;
2578         struct inet6_dev *idev;
2579 };
2580
2581 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2582
2583 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2584 {
2585         struct ifmcaddr6 *im = NULL;
2586         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2587         struct net *net = seq_file_net(seq);
2588
2589         state->idev = NULL;
2590         for_each_netdev_rcu(net, state->dev) {
2591                 struct inet6_dev *idev;
2592                 idev = __in6_dev_get(state->dev);
2593                 if (!idev)
2594                         continue;
2595                 read_lock_bh(&idev->lock);
2596                 im = idev->mc_list;
2597                 if (im) {
2598                         state->idev = idev;
2599                         break;
2600                 }
2601                 read_unlock_bh(&idev->lock);
2602         }
2603         return im;
2604 }
2605
2606 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2607 {
2608         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2609
2610         im = im->next;
2611         while (!im) {
2612                 if (likely(state->idev != NULL))
2613                         read_unlock_bh(&state->idev->lock);
2614
2615                 state->dev = next_net_device_rcu(state->dev);
2616                 if (!state->dev) {
2617                         state->idev = NULL;
2618                         break;
2619                 }
2620                 state->idev = __in6_dev_get(state->dev);
2621                 if (!state->idev)
2622                         continue;
2623                 read_lock_bh(&state->idev->lock);
2624                 im = state->idev->mc_list;
2625         }
2626         return im;
2627 }
2628
2629 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2630 {
2631         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2632         if (im)
2633                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2634                         --pos;
2635         return pos ? NULL : im;
2636 }
2637
2638 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2639         __acquires(RCU)
2640 {
2641         rcu_read_lock();
2642         return igmp6_mc_get_idx(seq, *pos);
2643 }
2644
2645 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2646 {
2647         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2648
2649         ++*pos;
2650         return im;
2651 }
2652
2653 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2654         __releases(RCU)
2655 {
2656         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2657
2658         if (likely(state->idev != NULL)) {
2659                 read_unlock_bh(&state->idev->lock);
2660                 state->idev = NULL;
2661         }
2662         state->dev = NULL;
2663         rcu_read_unlock();
2664 }
2665
2666 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2667 {
2668         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2669         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2670
2671         seq_printf(seq,
2672                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2673                    state->dev->ifindex, state->dev->name,
2674                    &im->mca_addr,
2675                    im->mca_users, im->mca_flags,
2676                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2677                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2678         return 0;
2679 }
2680
2681 static const struct seq_operations igmp6_mc_seq_ops = {
2682         .start  =       igmp6_mc_seq_start,
2683         .next   =       igmp6_mc_seq_next,
2684         .stop   =       igmp6_mc_seq_stop,
2685         .show   =       igmp6_mc_seq_show,
2686 };
2687
2688 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2689 {
2690         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2691                             sizeof(struct igmp6_mc_iter_state));
2692 }
2693
2694 static const struct file_operations igmp6_mc_seq_fops = {
2695         .owner          =       THIS_MODULE,
2696         .open           =       igmp6_mc_seq_open,
2697         .read           =       seq_read,
2698         .llseek         =       seq_lseek,
2699         .release        =       seq_release_net,
2700 };
2701
2702 struct igmp6_mcf_iter_state {
2703         struct seq_net_private p;
2704         struct net_device *dev;
2705         struct inet6_dev *idev;
2706         struct ifmcaddr6 *im;
2707 };
2708
2709 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2710
2711 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2712 {
2713         struct ip6_sf_list *psf = NULL;
2714         struct ifmcaddr6 *im = NULL;
2715         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2716         struct net *net = seq_file_net(seq);
2717
2718         state->idev = NULL;
2719         state->im = NULL;
2720         for_each_netdev_rcu(net, state->dev) {
2721                 struct inet6_dev *idev;
2722                 idev = __in6_dev_get(state->dev);
2723                 if (unlikely(idev == NULL))
2724                         continue;
2725                 read_lock_bh(&idev->lock);
2726                 im = idev->mc_list;
2727                 if (likely(im != NULL)) {
2728                         spin_lock_bh(&im->mca_lock);
2729                         psf = im->mca_sources;
2730                         if (likely(psf != NULL)) {
2731                                 state->im = im;
2732                                 state->idev = idev;
2733                                 break;
2734                         }
2735                         spin_unlock_bh(&im->mca_lock);
2736                 }
2737                 read_unlock_bh(&idev->lock);
2738         }
2739         return psf;
2740 }
2741
2742 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2743 {
2744         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2745
2746         psf = psf->sf_next;
2747         while (!psf) {
2748                 spin_unlock_bh(&state->im->mca_lock);
2749                 state->im = state->im->next;
2750                 while (!state->im) {
2751                         if (likely(state->idev != NULL))
2752                                 read_unlock_bh(&state->idev->lock);
2753
2754                         state->dev = next_net_device_rcu(state->dev);
2755                         if (!state->dev) {
2756                                 state->idev = NULL;
2757                                 goto out;
2758                         }
2759                         state->idev = __in6_dev_get(state->dev);
2760                         if (!state->idev)
2761                                 continue;
2762                         read_lock_bh(&state->idev->lock);
2763                         state->im = state->idev->mc_list;
2764                 }
2765                 if (!state->im)
2766                         break;
2767                 spin_lock_bh(&state->im->mca_lock);
2768                 psf = state->im->mca_sources;
2769         }
2770 out:
2771         return psf;
2772 }
2773
2774 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2775 {
2776         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2777         if (psf)
2778                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2779                         --pos;
2780         return pos ? NULL : psf;
2781 }
2782
2783 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2784         __acquires(RCU)
2785 {
2786         rcu_read_lock();
2787         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2788 }
2789
2790 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2791 {
2792         struct ip6_sf_list *psf;
2793         if (v == SEQ_START_TOKEN)
2794                 psf = igmp6_mcf_get_first(seq);
2795         else
2796                 psf = igmp6_mcf_get_next(seq, v);
2797         ++*pos;
2798         return psf;
2799 }
2800
2801 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2802         __releases(RCU)
2803 {
2804         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2805         if (likely(state->im != NULL)) {
2806                 spin_unlock_bh(&state->im->mca_lock);
2807                 state->im = NULL;
2808         }
2809         if (likely(state->idev != NULL)) {
2810                 read_unlock_bh(&state->idev->lock);
2811                 state->idev = NULL;
2812         }
2813         state->dev = NULL;
2814         rcu_read_unlock();
2815 }
2816
2817 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2818 {
2819         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2820         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2821
2822         if (v == SEQ_START_TOKEN) {
2823                 seq_printf(seq,
2824                            "%3s %6s "
2825                            "%32s %32s %6s %6s\n", "Idx",
2826                            "Device", "Multicast Address",
2827                            "Source Address", "INC", "EXC");
2828         } else {
2829                 seq_printf(seq,
2830                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2831                            state->dev->ifindex, state->dev->name,
2832                            &state->im->mca_addr,
2833                            &psf->sf_addr,
2834                            psf->sf_count[MCAST_INCLUDE],
2835                            psf->sf_count[MCAST_EXCLUDE]);
2836         }
2837         return 0;
2838 }
2839
2840 static const struct seq_operations igmp6_mcf_seq_ops = {
2841         .start  =       igmp6_mcf_seq_start,
2842         .next   =       igmp6_mcf_seq_next,
2843         .stop   =       igmp6_mcf_seq_stop,
2844         .show   =       igmp6_mcf_seq_show,
2845 };
2846
2847 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2848 {
2849         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2850                             sizeof(struct igmp6_mcf_iter_state));
2851 }
2852
2853 static const struct file_operations igmp6_mcf_seq_fops = {
2854         .owner          =       THIS_MODULE,
2855         .open           =       igmp6_mcf_seq_open,
2856         .read           =       seq_read,
2857         .llseek         =       seq_lseek,
2858         .release        =       seq_release_net,
2859 };
2860
2861 static int __net_init igmp6_proc_init(struct net *net)
2862 {
2863         int err;
2864
2865         err = -ENOMEM;
2866         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2867                 goto out;
2868         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2869                          &igmp6_mcf_seq_fops))
2870                 goto out_proc_net_igmp6;
2871
2872         err = 0;
2873 out:
2874         return err;
2875
2876 out_proc_net_igmp6:
2877         remove_proc_entry("igmp6", net->proc_net);
2878         goto out;
2879 }
2880
2881 static void __net_exit igmp6_proc_exit(struct net *net)
2882 {
2883         remove_proc_entry("mcfilter6", net->proc_net);
2884         remove_proc_entry("igmp6", net->proc_net);
2885 }
2886 #else
2887 static inline int igmp6_proc_init(struct net *net)
2888 {
2889         return 0;
2890 }
2891 static inline void igmp6_proc_exit(struct net *net)
2892 {
2893 }
2894 #endif
2895
2896 static int __net_init igmp6_net_init(struct net *net)
2897 {
2898         int err;
2899
2900         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2901                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2902         if (err < 0) {
2903                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2904                        err);
2905                 goto out;
2906         }
2907
2908         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2909
2910         err = igmp6_proc_init(net);
2911         if (err)
2912                 goto out_sock_create;
2913 out:
2914         return err;
2915
2916 out_sock_create:
2917         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2918         goto out;
2919 }
2920
2921 static void __net_exit igmp6_net_exit(struct net *net)
2922 {
2923         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2924         igmp6_proc_exit(net);
2925 }
2926
2927 static struct pernet_operations igmp6_net_ops = {
2928         .init = igmp6_net_init,
2929         .exit = igmp6_net_exit,
2930 };
2931
2932 int __init igmp6_init(void)
2933 {
2934         return register_pernet_subsys(&igmp6_net_ops);
2935 }
2936
2937 void igmp6_cleanup(void)
2938 {
2939         unregister_pernet_subsys(&igmp6_net_ops);
2940 }