Pileus Git - ~andy/linux/blob - net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <linux/pkt_sched.h>
  48 #include <net/mld.h>
  49
  50 #include <linux/netfilter.h>
  51 #include <linux/netfilter_ipv6.h>
  52
  53 #include <net/net_namespace.h>
  54 #include <net/sock.h>
  55 #include <net/snmp.h>
  56
  57 #include <net/ipv6.h>
  58 #include <net/protocol.h>
  59 #include <net/if_inet6.h>
  60 #include <net/ndisc.h>
  61 #include <net/addrconf.h>
  62 #include <net/ip6_route.h>
  63 #include <net/inet_common.h>
  64
  65 #include <net/ip6_checksum.h>
  66
  67 /* Set to 3 to get tracing... */
  68 #define MCAST_DEBUG 2
  69
  70 #if MCAST_DEBUG >= 3
  71 #define MDBG(x) printk x
  72 #else
  73 #define MDBG(x)
  74 #endif
  75
  76 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  77 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  80         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  81 };
  82
  83 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  84
  85 /* Big mc list lock for all the sockets */
  86 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  87
  88 static void igmp6_join_group(struct ifmcaddr6 *ma);
  89 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  90 static void igmp6_timer_handler(unsigned long data);
  91
  92 static void mld_gq_timer_expire(unsigned long data);
  93 static void mld_ifc_timer_expire(unsigned long data);
  94 static void mld_ifc_event(struct inet6_dev *idev);
  95 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  96 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  97 static void mld_clear_delrec(struct inet6_dev *idev);
  98 static 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
 125 /*
 126  *      socket join on multicast group
 127  */
 128
 129 #define for_each_pmc_rcu(np, pmc)                               \
 130         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 131              pmc != NULL;                                       \
 132              pmc = rcu_dereference(pmc->next))
 133
 134 static int unsolicited_report_interval(struct inet6_dev *idev)
 135 {
 136         int iv;
 137
 138         if (mld_in_v1_mode(idev))
 139                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 140         else
 141                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 142
 143         return iv > 0 ? iv : 1;
 144 }
 145
 146 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 147 {
 148         struct net_device *dev = NULL;
 149         struct ipv6_mc_socklist *mc_lst;
 150         struct ipv6_pinfo *np = inet6_sk(sk);
 151         struct net *net = sock_net(sk);
 152         int err;
 153
 154         if (!ipv6_addr_is_multicast(addr))
 155                 return -EINVAL;
 156
 157         rcu_read_lock();
 158         for_each_pmc_rcu(np, mc_lst) {
 159                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 160                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 161                         rcu_read_unlock();
 162                         return -EADDRINUSE;
 163                 }
 164         }
 165         rcu_read_unlock();
 166
 167         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 168
 169         if (mc_lst == NULL)
 170                 return -ENOMEM;
 171
 172         mc_lst->next = NULL;
 173         mc_lst->addr = *addr;
 174
 175         rcu_read_lock();
 176         if (ifindex == 0) {
 177                 struct rt6_info *rt;
 178                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 179                 if (rt) {
 180                         dev = rt->dst.dev;
 181                         ip6_rt_put(rt);
 182                 }
 183         } else
 184                 dev = dev_get_by_index_rcu(net, ifindex);
 185
 186         if (dev == NULL) {
 187                 rcu_read_unlock();
 188                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 189                 return -ENODEV;
 190         }
 191
 192         mc_lst->ifindex = dev->ifindex;
 193         mc_lst->sfmode = MCAST_EXCLUDE;
 194         rwlock_init(&mc_lst->sflock);
 195         mc_lst->sflist = NULL;
 196
 197         /*
 198          *      now add/increase the group membership on the device
 199          */
 200
 201         err = ipv6_dev_mc_inc(dev, addr);
 202
 203         if (err) {
 204                 rcu_read_unlock();
 205                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 206                 return err;
 207         }
 208
 209         spin_lock(&ipv6_sk_mc_lock);
 210         mc_lst->next = np->ipv6_mc_list;
 211         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 212         spin_unlock(&ipv6_sk_mc_lock);
 213
 214         rcu_read_unlock();
 215
 216         return 0;
 217 }
 218
 219 /*
 220  *      socket leave on multicast group
 221  */
 222 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 223 {
 224         struct ipv6_pinfo *np = inet6_sk(sk);
 225         struct ipv6_mc_socklist *mc_lst;
 226         struct ipv6_mc_socklist __rcu **lnk;
 227         struct net *net = sock_net(sk);
 228
 229         if (!ipv6_addr_is_multicast(addr))
 230                 return -EINVAL;
 231
 232         spin_lock(&ipv6_sk_mc_lock);
 233         for (lnk = &np->ipv6_mc_list;
 234              (mc_lst = rcu_dereference_protected(*lnk,
 235                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 236               lnk = &mc_lst->next) {
 237                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 238                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 239                         struct net_device *dev;
 240
 241                         *lnk = mc_lst->next;
 242                         spin_unlock(&ipv6_sk_mc_lock);
 243
 244                         rcu_read_lock();
 245                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 246                         if (dev != NULL) {
 247                                 struct inet6_dev *idev = __in6_dev_get(dev);
 248
 249                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 250                                 if (idev)
 251                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 252                         } else
 253                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 254                         rcu_read_unlock();
 255                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 256                         kfree_rcu(mc_lst, rcu);
 257                         return 0;
 258                 }
 259         }
 260         spin_unlock(&ipv6_sk_mc_lock);
 261
 262         return -EADDRNOTAVAIL;
 263 }
 264
 265 /* called with rcu_read_lock() */
 266 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 267                                              const struct in6_addr *group,
 268                                              int ifindex)
 269 {
 270         struct net_device *dev = NULL;
 271         struct inet6_dev *idev = NULL;
 272
 273         if (ifindex == 0) {
 274                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 275
 276                 if (rt) {
 277                         dev = rt->dst.dev;
 278                         ip6_rt_put(rt);
 279                 }
 280         } else
 281                 dev = dev_get_by_index_rcu(net, ifindex);
 282
 283         if (!dev)
 284                 return NULL;
 285         idev = __in6_dev_get(dev);
 286         if (!idev)
 287                 return NULL;
 288         read_lock_bh(&idev->lock);
 289         if (idev->dead) {
 290                 read_unlock_bh(&idev->lock);
 291                 return NULL;
 292         }
 293         return idev;
 294 }
 295
 296 void ipv6_sock_mc_close(struct sock *sk)
 297 {
 298         struct ipv6_pinfo *np = inet6_sk(sk);
 299         struct ipv6_mc_socklist *mc_lst;
 300         struct net *net = sock_net(sk);
 301
 302         if (!rcu_access_pointer(np->ipv6_mc_list))
 303                 return;
 304
 305         spin_lock(&ipv6_sk_mc_lock);
 306         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 307                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 308                 struct net_device *dev;
 309
 310                 np->ipv6_mc_list = mc_lst->next;
 311                 spin_unlock(&ipv6_sk_mc_lock);
 312
 313                 rcu_read_lock();
 314                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 315                 if (dev) {
 316                         struct inet6_dev *idev = __in6_dev_get(dev);
 317
 318                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 319                         if (idev)
 320                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 321                 } else
 322                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 323                 rcu_read_unlock();
 324
 325                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 326                 kfree_rcu(mc_lst, rcu);
 327
 328                 spin_lock(&ipv6_sk_mc_lock);
 329         }
 330         spin_unlock(&ipv6_sk_mc_lock);
 331 }
 332
 333 int ip6_mc_source(int add, int omode, struct sock *sk,
 334         struct group_source_req *pgsr)
 335 {
 336         struct in6_addr *source, *group;
 337         struct ipv6_mc_socklist *pmc;
 338         struct inet6_dev *idev;
 339         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 340         struct ip6_sf_socklist *psl;
 341         struct net *net = sock_net(sk);
 342         int i, j, rv;
 343         int leavegroup = 0;
 344         int pmclocked = 0;
 345         int err;
 346
 347         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 348         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 349
 350         if (!ipv6_addr_is_multicast(group))
 351                 return -EINVAL;
 352
 353         rcu_read_lock();
 354         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 355         if (!idev) {
 356                 rcu_read_unlock();
 357                 return -ENODEV;
 358         }
 359
 360         err = -EADDRNOTAVAIL;
 361
 362         for_each_pmc_rcu(inet6, pmc) {
 363                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 364                         continue;
 365                 if (ipv6_addr_equal(&pmc->addr, group))
 366                         break;
 367         }
 368         if (!pmc) {             /* must have a prior join */
 369                 err = -EINVAL;
 370                 goto done;
 371         }
 372         /* if a source filter was set, must be the same mode as before */
 373         if (pmc->sflist) {
 374                 if (pmc->sfmode != omode) {
 375                         err = -EINVAL;
 376                         goto done;
 377                 }
 378         } else if (pmc->sfmode != omode) {
 379                 /* allow mode switches for empty-set filters */
 380                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 381                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 382                 pmc->sfmode = omode;
 383         }
 384
 385         write_lock(&pmc->sflock);
 386         pmclocked = 1;
 387
 388         psl = pmc->sflist;
 389         if (!add) {
 390                 if (!psl)
 391                         goto done;      /* err = -EADDRNOTAVAIL */
 392                 rv = !0;
 393                 for (i=0; i<psl->sl_count; i++) {
 394                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 395                         if (rv == 0)
 396                                 break;
 397                 }
 398                 if (rv)         /* source not found */
 399                         goto done;      /* err = -EADDRNOTAVAIL */
 400
 401                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 402                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 403                         leavegroup = 1;
 404                         goto done;
 405                 }
 406
 407                 /* update the interface filter */
 408                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 409
 410                 for (j=i+1; j<psl->sl_count; j++)
 411                         psl->sl_addr[j-1] = psl->sl_addr[j];
 412                 psl->sl_count--;
 413                 err = 0;
 414                 goto done;
 415         }
 416         /* else, add a new source to the filter */
 417
 418         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 419                 err = -ENOBUFS;
 420                 goto done;
 421         }
 422         if (!psl || psl->sl_count == psl->sl_max) {
 423                 struct ip6_sf_socklist *newpsl;
 424                 int count = IP6_SFBLOCK;
 425
 426                 if (psl)
 427                         count += psl->sl_max;
 428                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 429                 if (!newpsl) {
 430                         err = -ENOBUFS;
 431                         goto done;
 432                 }
 433                 newpsl->sl_max = count;
 434                 newpsl->sl_count = count - IP6_SFBLOCK;
 435                 if (psl) {
 436                         for (i=0; i<psl->sl_count; i++)
 437                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 438                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 439                 }
 440                 pmc->sflist = psl = newpsl;
 441         }
 442         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 443         for (i=0; i<psl->sl_count; i++) {
 444                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 445                 if (rv == 0) /* There is an error in the address. */
 446                         goto done;
 447         }
 448         for (j=psl->sl_count-1; j>=i; j--)
 449                 psl->sl_addr[j+1] = psl->sl_addr[j];
 450         psl->sl_addr[i] = *source;
 451         psl->sl_count++;
 452         err = 0;
 453         /* update the interface list */
 454         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 455 done:
 456         if (pmclocked)
 457                 write_unlock(&pmc->sflock);
 458         read_unlock_bh(&idev->lock);
 459         rcu_read_unlock();
 460         if (leavegroup)
 461                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 462         return err;
 463 }
 464
 465 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 466 {
 467         const struct in6_addr *group;
 468         struct ipv6_mc_socklist *pmc;
 469         struct inet6_dev *idev;
 470         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 471         struct ip6_sf_socklist *newpsl, *psl;
 472         struct net *net = sock_net(sk);
 473         int leavegroup = 0;
 474         int i, err;
 475
 476         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 477
 478         if (!ipv6_addr_is_multicast(group))
 479                 return -EINVAL;
 480         if (gsf->gf_fmode != MCAST_INCLUDE &&
 481             gsf->gf_fmode != MCAST_EXCLUDE)
 482                 return -EINVAL;
 483
 484         rcu_read_lock();
 485         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 486
 487         if (!idev) {
 488                 rcu_read_unlock();
 489                 return -ENODEV;
 490         }
 491
 492         err = 0;
 493
 494         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 495                 leavegroup = 1;
 496                 goto done;
 497         }
 498
 499         for_each_pmc_rcu(inet6, pmc) {
 500                 if (pmc->ifindex != gsf->gf_interface)
 501                         continue;
 502                 if (ipv6_addr_equal(&pmc->addr, group))
 503                         break;
 504         }
 505         if (!pmc) {             /* must have a prior join */
 506                 err = -EINVAL;
 507                 goto done;
 508         }
 509         if (gsf->gf_numsrc) {
 510                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 511                                                           GFP_ATOMIC);
 512                 if (!newpsl) {
 513                         err = -ENOBUFS;
 514                         goto done;
 515                 }
 516                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 517                 for (i=0; i<newpsl->sl_count; ++i) {
 518                         struct sockaddr_in6 *psin6;
 519
 520                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 521                         newpsl->sl_addr[i] = psin6->sin6_addr;
 522                 }
 523                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 524                         newpsl->sl_count, newpsl->sl_addr, 0);
 525                 if (err) {
 526                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 527                         goto done;
 528                 }
 529         } else {
 530                 newpsl = NULL;
 531                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 532         }
 533
 534         write_lock(&pmc->sflock);
 535         psl = pmc->sflist;
 536         if (psl) {
 537                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 538                         psl->sl_count, psl->sl_addr, 0);
 539                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 540         } else
 541                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 542         pmc->sflist = newpsl;
 543         pmc->sfmode = gsf->gf_fmode;
 544         write_unlock(&pmc->sflock);
 545         err = 0;
 546 done:
 547         read_unlock_bh(&idev->lock);
 548         rcu_read_unlock();
 549         if (leavegroup)
 550                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 551         return err;
 552 }
 553
 554 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 555         struct group_filter __user *optval, int __user *optlen)
 556 {
 557         int err, i, count, copycount;
 558         const struct in6_addr *group;
 559         struct ipv6_mc_socklist *pmc;
 560         struct inet6_dev *idev;
 561         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 562         struct ip6_sf_socklist *psl;
 563         struct net *net = sock_net(sk);
 564
 565         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 566
 567         if (!ipv6_addr_is_multicast(group))
 568                 return -EINVAL;
 569
 570         rcu_read_lock();
 571         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 572
 573         if (!idev) {
 574                 rcu_read_unlock();
 575                 return -ENODEV;
 576         }
 577
 578         err = -EADDRNOTAVAIL;
 579         /*
 580          * changes to the ipv6_mc_list require the socket lock and
 581          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 582          * so reading the list is safe.
 583          */
 584
 585         for_each_pmc_rcu(inet6, pmc) {
 586                 if (pmc->ifindex != gsf->gf_interface)
 587                         continue;
 588                 if (ipv6_addr_equal(group, &pmc->addr))
 589                         break;
 590         }
 591         if (!pmc)               /* must have a prior join */
 592                 goto done;
 593         gsf->gf_fmode = pmc->sfmode;
 594         psl = pmc->sflist;
 595         count = psl ? psl->sl_count : 0;
 596         read_unlock_bh(&idev->lock);
 597         rcu_read_unlock();
 598
 599         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 600         gsf->gf_numsrc = count;
 601         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 602             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 603                 return -EFAULT;
 604         }
 605         /* changes to psl require the socket lock, a read lock on
 606          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 607          * have the socket lock, so reading here is safe.
 608          */
 609         for (i=0; i<copycount; i++) {
 610                 struct sockaddr_in6 *psin6;
 611                 struct sockaddr_storage ss;
 612
 613                 psin6 = (struct sockaddr_in6 *)&ss;
 614                 memset(&ss, 0, sizeof(ss));
 615                 psin6->sin6_family = AF_INET6;
 616                 psin6->sin6_addr = psl->sl_addr[i];
 617                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 618                         return -EFAULT;
 619         }
 620         return 0;
 621 done:
 622         read_unlock_bh(&idev->lock);
 623         rcu_read_unlock();
 624         return err;
 625 }
 626
 627 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 628                     const struct in6_addr *src_addr)
 629 {
 630         struct ipv6_pinfo *np = inet6_sk(sk);
 631         struct ipv6_mc_socklist *mc;
 632         struct ip6_sf_socklist *psl;
 633         bool rv = true;
 634
 635         rcu_read_lock();
 636         for_each_pmc_rcu(np, mc) {
 637                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 638                         break;
 639         }
 640         if (!mc) {
 641                 rcu_read_unlock();
 642                 return true;
 643         }
 644         read_lock(&mc->sflock);
 645         psl = mc->sflist;
 646         if (!psl) {
 647                 rv = mc->sfmode == MCAST_EXCLUDE;
 648         } else {
 649                 int i;
 650
 651                 for (i=0; i<psl->sl_count; i++) {
 652                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 653                                 break;
 654                 }
 655                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 656                         rv = false;
 657                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 658                         rv = false;
 659         }
 660         read_unlock(&mc->sflock);
 661         rcu_read_unlock();
 662
 663         return rv;
 664 }
 665
 666 static void ma_put(struct ifmcaddr6 *mc)
 667 {
 668         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 669                 in6_dev_put(mc->idev);
 670                 kfree(mc);
 671         }
 672 }
 673
 674 static void igmp6_group_added(struct ifmcaddr6 *mc)
 675 {
 676         struct net_device *dev = mc->idev->dev;
 677         char buf[MAX_ADDR_LEN];
 678
 679         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 680             IPV6_ADDR_SCOPE_LINKLOCAL)
 681                 return;
 682
 683         spin_lock_bh(&mc->mca_lock);
 684         if (!(mc->mca_flags&MAF_LOADED)) {
 685                 mc->mca_flags |= MAF_LOADED;
 686                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 687                         dev_mc_add(dev, buf);
 688         }
 689         spin_unlock_bh(&mc->mca_lock);
 690
 691         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 692                 return;
 693
 694         if (mld_in_v1_mode(mc->idev)) {
 695                 igmp6_join_group(mc);
 696                 return;
 697         }
 698         /* else v2 */
 699
 700         mc->mca_crcount = mc->idev->mc_qrv;
 701         mld_ifc_event(mc->idev);
 702 }
 703
 704 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 705 {
 706         struct net_device *dev = mc->idev->dev;
 707         char buf[MAX_ADDR_LEN];
 708
 709         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 710             IPV6_ADDR_SCOPE_LINKLOCAL)
 711                 return;
 712
 713         spin_lock_bh(&mc->mca_lock);
 714         if (mc->mca_flags&MAF_LOADED) {
 715                 mc->mca_flags &= ~MAF_LOADED;
 716                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 717                         dev_mc_del(dev, buf);
 718         }
 719
 720         if (mc->mca_flags & MAF_NOREPORT)
 721                 goto done;
 722         spin_unlock_bh(&mc->mca_lock);
 723
 724         if (!mc->idev->dead)
 725                 igmp6_leave_group(mc);
 726
 727         spin_lock_bh(&mc->mca_lock);
 728         if (del_timer(&mc->mca_timer))
 729                 atomic_dec(&mc->mca_refcnt);
 730 done:
 731         ip6_mc_clear_src(mc);
 732         spin_unlock_bh(&mc->mca_lock);
 733 }
 734
 735 /*
 736  * deleted ifmcaddr6 manipulation
 737  */
 738 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 739 {
 740         struct ifmcaddr6 *pmc;
 741
 742         /* this is an "ifmcaddr6" for convenience; only the fields below
 743          * are actually used. In particular, the refcnt and users are not
 744          * used for management of the delete list. Using the same structure
 745          * for deleted items allows change reports to use common code with
 746          * non-deleted or query-response MCA's.
 747          */
 748         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 749         if (!pmc)
 750                 return;
 751
 752         spin_lock_bh(&im->mca_lock);
 753         spin_lock_init(&pmc->mca_lock);
 754         pmc->idev = im->idev;
 755         in6_dev_hold(idev);
 756         pmc->mca_addr = im->mca_addr;
 757         pmc->mca_crcount = idev->mc_qrv;
 758         pmc->mca_sfmode = im->mca_sfmode;
 759         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 760                 struct ip6_sf_list *psf;
 761
 762                 pmc->mca_tomb = im->mca_tomb;
 763                 pmc->mca_sources = im->mca_sources;
 764                 im->mca_tomb = im->mca_sources = NULL;
 765                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 766                         psf->sf_crcount = pmc->mca_crcount;
 767         }
 768         spin_unlock_bh(&im->mca_lock);
 769
 770         spin_lock_bh(&idev->mc_lock);
 771         pmc->next = idev->mc_tomb;
 772         idev->mc_tomb = pmc;
 773         spin_unlock_bh(&idev->mc_lock);
 774 }
 775
 776 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 777 {
 778         struct ifmcaddr6 *pmc, *pmc_prev;
 779         struct ip6_sf_list *psf, *psf_next;
 780
 781         spin_lock_bh(&idev->mc_lock);
 782         pmc_prev = NULL;
 783         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 784                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 785                         break;
 786                 pmc_prev = pmc;
 787         }
 788         if (pmc) {
 789                 if (pmc_prev)
 790                         pmc_prev->next = pmc->next;
 791                 else
 792                         idev->mc_tomb = pmc->next;
 793         }
 794         spin_unlock_bh(&idev->mc_lock);
 795
 796         if (pmc) {
 797                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 798                         psf_next = psf->sf_next;
 799                         kfree(psf);
 800                 }
 801                 in6_dev_put(pmc->idev);
 802                 kfree(pmc);
 803         }
 804 }
 805
 806 static void mld_clear_delrec(struct inet6_dev *idev)
 807 {
 808         struct ifmcaddr6 *pmc, *nextpmc;
 809
 810         spin_lock_bh(&idev->mc_lock);
 811         pmc = idev->mc_tomb;
 812         idev->mc_tomb = NULL;
 813         spin_unlock_bh(&idev->mc_lock);
 814
 815         for (; pmc; pmc = nextpmc) {
 816                 nextpmc = pmc->next;
 817                 ip6_mc_clear_src(pmc);
 818                 in6_dev_put(pmc->idev);
 819                 kfree(pmc);
 820         }
 821
 822         /* clear dead sources, too */
 823         read_lock_bh(&idev->lock);
 824         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 825                 struct ip6_sf_list *psf, *psf_next;
 826
 827                 spin_lock_bh(&pmc->mca_lock);
 828                 psf = pmc->mca_tomb;
 829                 pmc->mca_tomb = NULL;
 830                 spin_unlock_bh(&pmc->mca_lock);
 831                 for (; psf; psf=psf_next) {
 832                         psf_next = psf->sf_next;
 833                         kfree(psf);
 834                 }
 835         }
 836         read_unlock_bh(&idev->lock);
 837 }
 838
 839
 840 /*
 841  *      device multicast group inc (add if not found)
 842  */
 843 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 844 {
 845         struct ifmcaddr6 *mc;
 846         struct inet6_dev *idev;
 847
 848         /* we need to take a reference on idev */
 849         idev = in6_dev_get(dev);
 850
 851         if (idev == NULL)
 852                 return -EINVAL;
 853
 854         write_lock_bh(&idev->lock);
 855         if (idev->dead) {
 856                 write_unlock_bh(&idev->lock);
 857                 in6_dev_put(idev);
 858                 return -ENODEV;
 859         }
 860
 861         for (mc = idev->mc_list; mc; mc = mc->next) {
 862                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 863                         mc->mca_users++;
 864                         write_unlock_bh(&idev->lock);
 865                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 866                                 NULL, 0);
 867                         in6_dev_put(idev);
 868                         return 0;
 869                 }
 870         }
 871
 872         /*
 873          *      not found: create a new one.
 874          */
 875
 876         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 877
 878         if (mc == NULL) {
 879                 write_unlock_bh(&idev->lock);
 880                 in6_dev_put(idev);
 881                 return -ENOMEM;
 882         }
 883
 884         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 885
 886         mc->mca_addr = *addr;
 887         mc->idev = idev; /* (reference taken) */
 888         mc->mca_users = 1;
 889         /* mca_stamp should be updated upon changes */
 890         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 891         atomic_set(&mc->mca_refcnt, 2);
 892         spin_lock_init(&mc->mca_lock);
 893
 894         /* initial mode is (EX, empty) */
 895         mc->mca_sfmode = MCAST_EXCLUDE;
 896         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 897
 898         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 899             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 900                 mc->mca_flags |= MAF_NOREPORT;
 901
 902         mc->next = idev->mc_list;
 903         idev->mc_list = mc;
 904         write_unlock_bh(&idev->lock);
 905
 906         mld_del_delrec(idev, &mc->mca_addr);
 907         igmp6_group_added(mc);
 908         ma_put(mc);
 909         return 0;
 910 }
 911
 912 /*
 913  *      device multicast group del
 914  */
 915 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 916 {
 917         struct ifmcaddr6 *ma, **map;
 918
 919         write_lock_bh(&idev->lock);
 920         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 921                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 922                         if (--ma->mca_users == 0) {
 923                                 *map = ma->next;
 924                                 write_unlock_bh(&idev->lock);
 925
 926                                 igmp6_group_dropped(ma);
 927
 928                                 ma_put(ma);
 929                                 return 0;
 930                         }
 931                         write_unlock_bh(&idev->lock);
 932                         return 0;
 933                 }
 934         }
 935         write_unlock_bh(&idev->lock);
 936
 937         return -ENOENT;
 938 }
 939
 940 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 941 {
 942         struct inet6_dev *idev;
 943         int err;
 944
 945         rcu_read_lock();
 946
 947         idev = __in6_dev_get(dev);
 948         if (!idev)
 949                 err = -ENODEV;
 950         else
 951                 err = __ipv6_dev_mc_dec(idev, addr);
 952
 953         rcu_read_unlock();
 954         return err;
 955 }
 956
 957 /*
 958  *      check if the interface/address pair is valid
 959  */
 960 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 961                          const struct in6_addr *src_addr)
 962 {
 963         struct inet6_dev *idev;
 964         struct ifmcaddr6 *mc;
 965         bool rv = false;
 966
 967         rcu_read_lock();
 968         idev = __in6_dev_get(dev);
 969         if (idev) {
 970                 read_lock_bh(&idev->lock);
 971                 for (mc = idev->mc_list; mc; mc=mc->next) {
 972                         if (ipv6_addr_equal(&mc->mca_addr, group))
 973                                 break;
 974                 }
 975                 if (mc) {
 976                         if (src_addr && !ipv6_addr_any(src_addr)) {
 977                                 struct ip6_sf_list *psf;
 978
 979                                 spin_lock_bh(&mc->mca_lock);
 980                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 981                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 982                                                 break;
 983                                 }
 984                                 if (psf)
 985                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 986                                                 psf->sf_count[MCAST_EXCLUDE] !=
 987                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 988                                 else
 989                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 990                                 spin_unlock_bh(&mc->mca_lock);
 991                         } else
 992                                 rv = true; /* don't filter unspecified source */
 993                 }
 994                 read_unlock_bh(&idev->lock);
 995         }
 996         rcu_read_unlock();
 997         return rv;
 998 }
 999
1000 static void mld_gq_start_timer(struct inet6_dev *idev)
1001 {
1002         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1003
1004         idev->mc_gq_running = 1;
1005         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1006                 in6_dev_hold(idev);
1007 }
1008
1009 static void mld_gq_stop_timer(struct inet6_dev *idev)
1010 {
1011         idev->mc_gq_running = 0;
1012         if (del_timer(&idev->mc_gq_timer))
1013                 __in6_dev_put(idev);
1014 }
1015
1016 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1017 {
1018         unsigned long tv = prandom_u32() % delay;
1019
1020         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1021                 in6_dev_hold(idev);
1022 }
1023
1024 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1025 {
1026         idev->mc_ifc_count = 0;
1027         if (del_timer(&idev->mc_ifc_timer))
1028                 __in6_dev_put(idev);
1029 }
1030
1031 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1032 {
1033         unsigned long tv = prandom_u32() % delay;
1034
1035         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1036                 in6_dev_hold(idev);
1037 }
1038
1039 static void mld_dad_stop_timer(struct inet6_dev *idev)
1040 {
1041         if (del_timer(&idev->mc_dad_timer))
1042                 __in6_dev_put(idev);
1043 }
1044
1045 /*
1046  *      IGMP handling (alias multicast ICMPv6 messages)
1047  */
1048
1049 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1050 {
1051         unsigned long delay = resptime;
1052
1053         /* Do not start timer for these addresses */
1054         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1055             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1056                 return;
1057
1058         if (del_timer(&ma->mca_timer)) {
1059                 atomic_dec(&ma->mca_refcnt);
1060                 delay = ma->mca_timer.expires - jiffies;
1061         }
1062
1063         if (delay >= resptime)
1064                 delay = prandom_u32() % resptime;
1065
1066         ma->mca_timer.expires = jiffies + delay;
1067         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1068                 atomic_inc(&ma->mca_refcnt);
1069         ma->mca_flags |= MAF_TIMER_RUNNING;
1070 }
1071
1072 /* mark EXCLUDE-mode sources */
1073 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1074                              const struct in6_addr *srcs)
1075 {
1076         struct ip6_sf_list *psf;
1077         int i, scount;
1078
1079         scount = 0;
1080         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1081                 if (scount == nsrcs)
1082                         break;
1083                 for (i=0; i<nsrcs; i++) {
1084                         /* skip inactive filters */
1085                         if (psf->sf_count[MCAST_INCLUDE] ||
1086                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1087                             psf->sf_count[MCAST_EXCLUDE])
1088                                 break;
1089                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1090                                 scount++;
1091                                 break;
1092                         }
1093                 }
1094         }
1095         pmc->mca_flags &= ~MAF_GSQUERY;
1096         if (scount == nsrcs)    /* all sources excluded */
1097                 return false;
1098         return true;
1099 }
1100
1101 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1102                             const struct in6_addr *srcs)
1103 {
1104         struct ip6_sf_list *psf;
1105         int i, scount;
1106
1107         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1108                 return mld_xmarksources(pmc, nsrcs, srcs);
1109
1110         /* mark INCLUDE-mode sources */
1111
1112         scount = 0;
1113         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1114                 if (scount == nsrcs)
1115                         break;
1116                 for (i=0; i<nsrcs; i++) {
1117                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1118                                 psf->sf_gsresp = 1;
1119                                 scount++;
1120                                 break;
1121                         }
1122                 }
1123         }
1124         if (!scount) {
1125                 pmc->mca_flags &= ~MAF_GSQUERY;
1126                 return false;
1127         }
1128         pmc->mca_flags |= MAF_GSQUERY;
1129         return true;
1130 }
1131
1132 static int mld_force_mld_version(const struct inet6_dev *idev)
1133 {
1134         /* Normally, both are 0 here. If enforcement to a particular is
1135          * being used, individual device enforcement will have a lower
1136          * precedence over 'all' device (.../conf/all/force_mld_version).
1137          */
1138
1139         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1140                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1141         else
1142                 return idev->cnf.force_mld_version;
1143 }
1144
1145 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1146 {
1147         return mld_force_mld_version(idev) == 2;
1148 }
1149
1150 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1151 {
1152         return mld_force_mld_version(idev) == 1;
1153 }
1154
1155 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1156 {
1157         if (mld_in_v2_mode_only(idev))
1158                 return false;
1159         if (mld_in_v1_mode_only(idev))
1160                 return true;
1161         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1162                 return true;
1163
1164         return false;
1165 }
1166
1167 static void mld_set_v1_mode(struct inet6_dev *idev)
1168 {
1169         /* RFC3810, relevant sections:
1170          *  - 9.1. Robustness Variable
1171          *  - 9.2. Query Interval
1172          *  - 9.3. Query Response Interval
1173          *  - 9.12. Older Version Querier Present Timeout
1174          */
1175         unsigned long switchback;
1176
1177         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1178
1179         idev->mc_v1_seen = jiffies + switchback;
1180 }
1181
1182 static void mld_update_qrv(struct inet6_dev *idev,
1183                            const struct mld2_query *mlh2)
1184 {
1185         /* RFC3810, relevant sections:
1186          *  - 5.1.8. QRV (Querier's Robustness Variable)
1187          *  - 9.1. Robustness Variable
1188          */
1189
1190         /* The value of the Robustness Variable MUST NOT be zero,
1191          * and SHOULD NOT be one. Catch this here if we ever run
1192          * into such a case in future.
1193          */
1194         WARN_ON(idev->mc_qrv == 0);
1195
1196         if (mlh2->mld2q_qrv > 0)
1197                 idev->mc_qrv = mlh2->mld2q_qrv;
1198
1199         if (unlikely(idev->mc_qrv < 2)) {
1200                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1201                                      idev->mc_qrv, MLD_QRV_DEFAULT);
1202                 idev->mc_qrv = MLD_QRV_DEFAULT;
1203         }
1204 }
1205
1206 static void mld_update_qi(struct inet6_dev *idev,
1207                           const struct mld2_query *mlh2)
1208 {
1209         /* RFC3810, relevant sections:
1210          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1211          *  - 9.2. Query Interval
1212          *  - 9.12. Older Version Querier Present Timeout
1213          *    (the [Query Interval] in the last Query received)
1214          */
1215         unsigned long mc_qqi;
1216
1217         if (mlh2->mld2q_qqic < 128) {
1218                 mc_qqi = mlh2->mld2q_qqic;
1219         } else {
1220                 unsigned long mc_man, mc_exp;
1221
1222                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1223                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1224
1225                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1226         }
1227
1228         idev->mc_qi = mc_qqi * HZ;
1229 }
1230
1231 static void mld_update_qri(struct inet6_dev *idev,
1232                            const struct mld2_query *mlh2)
1233 {
1234         /* RFC3810, relevant sections:
1235          *  - 5.1.3. Maximum Response Code
1236          *  - 9.3. Query Response Interval
1237          */
1238         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1239 }
1240
1241 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1242                           unsigned long *max_delay)
1243 {
1244         unsigned long mldv1_md;
1245
1246         /* Ignore v1 queries */
1247         if (mld_in_v2_mode_only(idev))
1248                 return -EINVAL;
1249
1250         /* MLDv1 router present */
1251         mldv1_md = ntohs(mld->mld_maxdelay);
1252         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1253
1254         mld_set_v1_mode(idev);
1255
1256         /* cancel MLDv2 report timer */
1257         mld_gq_stop_timer(idev);
1258         /* cancel the interface change timer */
1259         mld_ifc_stop_timer(idev);
1260         /* clear deleted report items */
1261         mld_clear_delrec(idev);
1262
1263         return 0;
1264 }
1265
1266 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1267                           unsigned long *max_delay)
1268 {
1269         /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1270         if (mld_in_v1_mode(idev))
1271                 return -EINVAL;
1272
1273         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1274
1275         mld_update_qrv(idev, mld);
1276         mld_update_qi(idev, mld);
1277         mld_update_qri(idev, mld);
1278
1279         idev->mc_maxdelay = *max_delay;
1280
1281         return 0;
1282 }
1283
1284 /* called with rcu_read_lock() */
1285 int igmp6_event_query(struct sk_buff *skb)
1286 {
1287         struct mld2_query *mlh2 = NULL;
1288         struct ifmcaddr6 *ma;
1289         const struct in6_addr *group;
1290         unsigned long max_delay;
1291         struct inet6_dev *idev;
1292         struct mld_msg *mld;
1293         int group_type;
1294         int mark = 0;
1295         int len, err;
1296
1297         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1298                 return -EINVAL;
1299
1300         /* compute payload length excluding extension headers */
1301         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1302         len -= skb_network_header_len(skb);
1303
1304         /* Drop queries with not link local source */
1305         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1306                 return -EINVAL;
1307
1308         idev = __in6_dev_get(skb->dev);
1309         if (idev == NULL)
1310                 return 0;
1311
1312         mld = (struct mld_msg *)icmp6_hdr(skb);
1313         group = &mld->mld_mca;
1314         group_type = ipv6_addr_type(group);
1315
1316         if (group_type != IPV6_ADDR_ANY &&
1317             !(group_type&IPV6_ADDR_MULTICAST))
1318                 return -EINVAL;
1319
1320         if (len == MLD_V1_QUERY_LEN) {
1321                 err = mld_process_v1(idev, mld, &max_delay);
1322                 if (err < 0)
1323                         return err;
1324         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1325                 int srcs_offset = sizeof(struct mld2_query) -
1326                                   sizeof(struct icmp6hdr);
1327
1328                 if (!pskb_may_pull(skb, srcs_offset))
1329                         return -EINVAL;
1330
1331                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1332
1333                 err = mld_process_v2(idev, mlh2, &max_delay);
1334                 if (err < 0)
1335                         return err;
1336
1337                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1338                         if (mlh2->mld2q_nsrcs)
1339                                 return -EINVAL; /* no sources allowed */
1340
1341                         mld_gq_start_timer(idev);
1342                         return 0;
1343                 }
1344                 /* mark sources to include, if group & source-specific */
1345                 if (mlh2->mld2q_nsrcs != 0) {
1346                         if (!pskb_may_pull(skb, srcs_offset +
1347                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1348                                 return -EINVAL;
1349
1350                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1351                         mark = 1;
1352                 }
1353         } else
1354                 return -EINVAL;
1355
1356         read_lock_bh(&idev->lock);
1357         if (group_type == IPV6_ADDR_ANY) {
1358                 for (ma = idev->mc_list; ma; ma=ma->next) {
1359                         spin_lock_bh(&ma->mca_lock);
1360                         igmp6_group_queried(ma, max_delay);
1361                         spin_unlock_bh(&ma->mca_lock);
1362                 }
1363         } else {
1364                 for (ma = idev->mc_list; ma; ma=ma->next) {
1365                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1366                                 continue;
1367                         spin_lock_bh(&ma->mca_lock);
1368                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1369                                 /* gsquery <- gsquery && mark */
1370                                 if (!mark)
1371                                         ma->mca_flags &= ~MAF_GSQUERY;
1372                         } else {
1373                                 /* gsquery <- mark */
1374                                 if (mark)
1375                                         ma->mca_flags |= MAF_GSQUERY;
1376                                 else
1377                                         ma->mca_flags &= ~MAF_GSQUERY;
1378                         }
1379                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1380                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1381                                 igmp6_group_queried(ma, max_delay);
1382                         spin_unlock_bh(&ma->mca_lock);
1383                         break;
1384                 }
1385         }
1386         read_unlock_bh(&idev->lock);
1387
1388         return 0;
1389 }
1390
1391 /* called with rcu_read_lock() */
1392 int igmp6_event_report(struct sk_buff *skb)
1393 {
1394         struct ifmcaddr6 *ma;
1395         struct inet6_dev *idev;
1396         struct mld_msg *mld;
1397         int addr_type;
1398
1399         /* Our own report looped back. Ignore it. */
1400         if (skb->pkt_type == PACKET_LOOPBACK)
1401                 return 0;
1402
1403         /* send our report if the MC router may not have heard this report */
1404         if (skb->pkt_type != PACKET_MULTICAST &&
1405             skb->pkt_type != PACKET_BROADCAST)
1406                 return 0;
1407
1408         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1409                 return -EINVAL;
1410
1411         mld = (struct mld_msg *)icmp6_hdr(skb);
1412
1413         /* Drop reports with not link local source */
1414         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1415         if (addr_type != IPV6_ADDR_ANY &&
1416             !(addr_type&IPV6_ADDR_LINKLOCAL))
1417                 return -EINVAL;
1418
1419         idev = __in6_dev_get(skb->dev);
1420         if (idev == NULL)
1421                 return -ENODEV;
1422
1423         /*
1424          *      Cancel the timer for this group
1425          */
1426
1427         read_lock_bh(&idev->lock);
1428         for (ma = idev->mc_list; ma; ma=ma->next) {
1429                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1430                         spin_lock(&ma->mca_lock);
1431                         if (del_timer(&ma->mca_timer))
1432                                 atomic_dec(&ma->mca_refcnt);
1433                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1434                         spin_unlock(&ma->mca_lock);
1435                         break;
1436                 }
1437         }
1438         read_unlock_bh(&idev->lock);
1439         return 0;
1440 }
1441
1442 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1443                   int gdeleted, int sdeleted)
1444 {
1445         switch (type) {
1446         case MLD2_MODE_IS_INCLUDE:
1447         case MLD2_MODE_IS_EXCLUDE:
1448                 if (gdeleted || sdeleted)
1449                         return false;
1450                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1451                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1452                                 return true;
1453                         /* don't include if this source is excluded
1454                          * in all filters
1455                          */
1456                         if (psf->sf_count[MCAST_INCLUDE])
1457                                 return type == MLD2_MODE_IS_INCLUDE;
1458                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1459                                 psf->sf_count[MCAST_EXCLUDE];
1460                 }
1461                 return false;
1462         case MLD2_CHANGE_TO_INCLUDE:
1463                 if (gdeleted || sdeleted)
1464                         return false;
1465                 return psf->sf_count[MCAST_INCLUDE] != 0;
1466         case MLD2_CHANGE_TO_EXCLUDE:
1467                 if (gdeleted || sdeleted)
1468                         return false;
1469                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1470                     psf->sf_count[MCAST_INCLUDE])
1471                         return false;
1472                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1473                         psf->sf_count[MCAST_EXCLUDE];
1474         case MLD2_ALLOW_NEW_SOURCES:
1475                 if (gdeleted || !psf->sf_crcount)
1476                         return false;
1477                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1478         case MLD2_BLOCK_OLD_SOURCES:
1479                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1480                         return gdeleted || (psf->sf_crcount && sdeleted);
1481                 return psf->sf_crcount && !gdeleted && !sdeleted;
1482         }
1483         return false;
1484 }
1485
1486 static int
1487 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1488 {
1489         struct ip6_sf_list *psf;
1490         int scount = 0;
1491
1492         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1493                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1494                         continue;
1495                 scount++;
1496         }
1497         return scount;
1498 }
1499
1500 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1501                        struct net_device *dev,
1502                        const struct in6_addr *saddr,
1503                        const struct in6_addr *daddr,
1504                        int proto, int len)
1505 {
1506         struct ipv6hdr *hdr;
1507
1508         skb->protocol = htons(ETH_P_IPV6);
1509         skb->dev = dev;
1510
1511         skb_reset_network_header(skb);
1512         skb_put(skb, sizeof(struct ipv6hdr));
1513         hdr = ipv6_hdr(skb);
1514
1515         ip6_flow_hdr(hdr, 0, 0);
1516
1517         hdr->payload_len = htons(len);
1518         hdr->nexthdr = proto;
1519         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1520
1521         hdr->saddr = *saddr;
1522         hdr->daddr = *daddr;
1523 }
1524
1525 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1526 {
1527         struct net_device *dev = idev->dev;
1528         struct net *net = dev_net(dev);
1529         struct sock *sk = net->ipv6.igmp_sk;
1530         struct sk_buff *skb;
1531         struct mld2_report *pmr;
1532         struct in6_addr addr_buf;
1533         const struct in6_addr *saddr;
1534         int hlen = LL_RESERVED_SPACE(dev);
1535         int tlen = dev->needed_tailroom;
1536         int err;
1537         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1538                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1539                      IPV6_TLV_PADN, 0 };
1540
1541         /* we assume size > sizeof(ra) here */
1542         size += hlen + tlen;
1543         /* limit our allocations to order-0 page */
1544         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1545         skb = sock_alloc_send_skb(sk, size, 1, &err);
1546
1547         if (!skb)
1548                 return NULL;
1549
1550         skb->priority = TC_PRIO_CONTROL;
1551         skb_reserve(skb, hlen);
1552
1553         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1554                 /* <draft-ietf-magma-mld-source-05.txt>:
1555                  * use unspecified address as the source address
1556                  * when a valid link-local address is not available.
1557                  */
1558                 saddr = &in6addr_any;
1559         } else
1560                 saddr = &addr_buf;
1561
1562         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1563
1564         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1565
1566         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1567         skb_put(skb, sizeof(*pmr));
1568         pmr = (struct mld2_report *)skb_transport_header(skb);
1569         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1570         pmr->mld2r_resv1 = 0;
1571         pmr->mld2r_cksum = 0;
1572         pmr->mld2r_resv2 = 0;
1573         pmr->mld2r_ngrec = 0;
1574         return skb;
1575 }
1576
1577 static void mld_sendpack(struct sk_buff *skb)
1578 {
1579         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1580         struct mld2_report *pmr =
1581                               (struct mld2_report *)skb_transport_header(skb);
1582         int payload_len, mldlen;
1583         struct inet6_dev *idev;
1584         struct net *net = dev_net(skb->dev);
1585         int err;
1586         struct flowi6 fl6;
1587         struct dst_entry *dst;
1588
1589         rcu_read_lock();
1590         idev = __in6_dev_get(skb->dev);
1591         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1592
1593         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1594                 sizeof(*pip6);
1595         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1596         pip6->payload_len = htons(payload_len);
1597
1598         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1599                                            IPPROTO_ICMPV6,
1600                                            csum_partial(skb_transport_header(skb),
1601                                                         mldlen, 0));
1602
1603         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1604                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1605                          skb->dev->ifindex);
1606         dst = icmp6_dst_alloc(skb->dev, &fl6);
1607
1608         err = 0;
1609         if (IS_ERR(dst)) {
1610                 err = PTR_ERR(dst);
1611                 dst = NULL;
1612         }
1613         skb_dst_set(skb, dst);
1614         if (err)
1615                 goto err_out;
1616
1617         payload_len = skb->len;
1618
1619         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1620                       dst_output);
1621 out:
1622         if (!err) {
1623                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1624                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1625                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1626         } else
1627                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1628
1629         rcu_read_unlock();
1630         return;
1631
1632 err_out:
1633         kfree_skb(skb);
1634         goto out;
1635 }
1636
1637 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1638 {
1639         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1640 }
1641
1642 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1643         int type, struct mld2_grec **ppgr)
1644 {
1645         struct net_device *dev = pmc->idev->dev;
1646         struct mld2_report *pmr;
1647         struct mld2_grec *pgr;
1648
1649         if (!skb)
1650                 skb = mld_newpack(pmc->idev, dev->mtu);
1651         if (!skb)
1652                 return NULL;
1653         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1654         pgr->grec_type = type;
1655         pgr->grec_auxwords = 0;
1656         pgr->grec_nsrcs = 0;
1657         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1658         pmr = (struct mld2_report *)skb_transport_header(skb);
1659         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1660         *ppgr = pgr;
1661         return skb;
1662 }
1663
1664 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1665         skb_tailroom(skb)) : 0)
1666
1667 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1668         int type, int gdeleted, int sdeleted, int crsend)
1669 {
1670         struct inet6_dev *idev = pmc->idev;
1671         struct net_device *dev = idev->dev;
1672         struct mld2_report *pmr;
1673         struct mld2_grec *pgr = NULL;
1674         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1675         int scount, stotal, first, isquery, truncate;
1676
1677         if (pmc->mca_flags & MAF_NOREPORT)
1678                 return skb;
1679
1680         isquery = type == MLD2_MODE_IS_INCLUDE ||
1681                   type == MLD2_MODE_IS_EXCLUDE;
1682         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1683                     type == MLD2_CHANGE_TO_EXCLUDE;
1684
1685         stotal = scount = 0;
1686
1687         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1688
1689         if (!*psf_list)
1690                 goto empty_source;
1691
1692         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1693
1694         /* EX and TO_EX get a fresh packet, if needed */
1695         if (truncate) {
1696                 if (pmr && pmr->mld2r_ngrec &&
1697                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1698                         if (skb)
1699                                 mld_sendpack(skb);
1700                         skb = mld_newpack(idev, dev->mtu);
1701                 }
1702         }
1703         first = 1;
1704         psf_prev = NULL;
1705         for (psf=*psf_list; psf; psf=psf_next) {
1706                 struct in6_addr *psrc;
1707
1708                 psf_next = psf->sf_next;
1709
1710                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1711                         psf_prev = psf;
1712                         continue;
1713                 }
1714
1715                 /* clear marks on query responses */
1716                 if (isquery)
1717                         psf->sf_gsresp = 0;
1718
1719                 if (AVAILABLE(skb) < sizeof(*psrc) +
1720                     first*sizeof(struct mld2_grec)) {
1721                         if (truncate && !first)
1722                                 break;   /* truncate these */
1723                         if (pgr)
1724                                 pgr->grec_nsrcs = htons(scount);
1725                         if (skb)
1726                                 mld_sendpack(skb);
1727                         skb = mld_newpack(idev, dev->mtu);
1728                         first = 1;
1729                         scount = 0;
1730                 }
1731                 if (first) {
1732                         skb = add_grhead(skb, pmc, type, &pgr);
1733                         first = 0;
1734                 }
1735                 if (!skb)
1736                         return NULL;
1737                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1738                 *psrc = psf->sf_addr;
1739                 scount++; stotal++;
1740                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1741                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1742                         psf->sf_crcount--;
1743                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1744                                 if (psf_prev)
1745                                         psf_prev->sf_next = psf->sf_next;
1746                                 else
1747                                         *psf_list = psf->sf_next;
1748                                 kfree(psf);
1749                                 continue;
1750                         }
1751                 }
1752                 psf_prev = psf;
1753         }
1754
1755 empty_source:
1756         if (!stotal) {
1757                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1758                     type == MLD2_BLOCK_OLD_SOURCES)
1759                         return skb;
1760                 if (pmc->mca_crcount || isquery || crsend) {
1761                         /* make sure we have room for group header */
1762                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1763                                 mld_sendpack(skb);
1764                                 skb = NULL; /* add_grhead will get a new one */
1765                         }
1766                         skb = add_grhead(skb, pmc, type, &pgr);
1767                 }
1768         }
1769         if (pgr)
1770                 pgr->grec_nsrcs = htons(scount);
1771
1772         if (isquery)
1773                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1774         return skb;
1775 }
1776
1777 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1778 {
1779         struct sk_buff *skb = NULL;
1780         int type;
1781
1782         read_lock_bh(&idev->lock);
1783         if (!pmc) {
1784                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1785                         if (pmc->mca_flags & MAF_NOREPORT)
1786                                 continue;
1787                         spin_lock_bh(&pmc->mca_lock);
1788                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1789                                 type = MLD2_MODE_IS_EXCLUDE;
1790                         else
1791                                 type = MLD2_MODE_IS_INCLUDE;
1792                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1793                         spin_unlock_bh(&pmc->mca_lock);
1794                 }
1795         } else {
1796                 spin_lock_bh(&pmc->mca_lock);
1797                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1798                         type = MLD2_MODE_IS_EXCLUDE;
1799                 else
1800                         type = MLD2_MODE_IS_INCLUDE;
1801                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1802                 spin_unlock_bh(&pmc->mca_lock);
1803         }
1804         read_unlock_bh(&idev->lock);
1805         if (skb)
1806                 mld_sendpack(skb);
1807 }
1808
1809 /*
1810  * remove zero-count source records from a source filter list
1811  */
1812 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1813 {
1814         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1815
1816         psf_prev = NULL;
1817         for (psf=*ppsf; psf; psf = psf_next) {
1818                 psf_next = psf->sf_next;
1819                 if (psf->sf_crcount == 0) {
1820                         if (psf_prev)
1821                                 psf_prev->sf_next = psf->sf_next;
1822                         else
1823                                 *ppsf = psf->sf_next;
1824                         kfree(psf);
1825                 } else
1826                         psf_prev = psf;
1827         }
1828 }
1829
1830 static void mld_send_cr(struct inet6_dev *idev)
1831 {
1832         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1833         struct sk_buff *skb = NULL;
1834         int type, dtype;
1835
1836         read_lock_bh(&idev->lock);
1837         spin_lock(&idev->mc_lock);
1838
1839         /* deleted MCA's */
1840         pmc_prev = NULL;
1841         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1842                 pmc_next = pmc->next;
1843                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1844                         type = MLD2_BLOCK_OLD_SOURCES;
1845                         dtype = MLD2_BLOCK_OLD_SOURCES;
1846                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1847                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1848                 }
1849                 if (pmc->mca_crcount) {
1850                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1851                                 type = MLD2_CHANGE_TO_INCLUDE;
1852                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1853                         }
1854                         pmc->mca_crcount--;
1855                         if (pmc->mca_crcount == 0) {
1856                                 mld_clear_zeros(&pmc->mca_tomb);
1857                                 mld_clear_zeros(&pmc->mca_sources);
1858                         }
1859                 }
1860                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1861                     !pmc->mca_sources) {
1862                         if (pmc_prev)
1863                                 pmc_prev->next = pmc_next;
1864                         else
1865                                 idev->mc_tomb = pmc_next;
1866                         in6_dev_put(pmc->idev);
1867                         kfree(pmc);
1868                 } else
1869                         pmc_prev = pmc;
1870         }
1871         spin_unlock(&idev->mc_lock);
1872
1873         /* change recs */
1874         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1875                 spin_lock_bh(&pmc->mca_lock);
1876                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1877                         type = MLD2_BLOCK_OLD_SOURCES;
1878                         dtype = MLD2_ALLOW_NEW_SOURCES;
1879                 } else {
1880                         type = MLD2_ALLOW_NEW_SOURCES;
1881                         dtype = MLD2_BLOCK_OLD_SOURCES;
1882                 }
1883                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1884                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1885
1886                 /* filter mode changes */
1887                 if (pmc->mca_crcount) {
1888                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1889                                 type = MLD2_CHANGE_TO_EXCLUDE;
1890                         else
1891                                 type = MLD2_CHANGE_TO_INCLUDE;
1892                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1893                         pmc->mca_crcount--;
1894                 }
1895                 spin_unlock_bh(&pmc->mca_lock);
1896         }
1897         read_unlock_bh(&idev->lock);
1898         if (!skb)
1899                 return;
1900         (void) mld_sendpack(skb);
1901 }
1902
1903 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1904 {
1905         struct net *net = dev_net(dev);
1906         struct sock *sk = net->ipv6.igmp_sk;
1907         struct inet6_dev *idev;
1908         struct sk_buff *skb;
1909         struct mld_msg *hdr;
1910         const struct in6_addr *snd_addr, *saddr;
1911         struct in6_addr addr_buf;
1912         int hlen = LL_RESERVED_SPACE(dev);
1913         int tlen = dev->needed_tailroom;
1914         int err, len, payload_len, full_len;
1915         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1916                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1917                      IPV6_TLV_PADN, 0 };
1918         struct flowi6 fl6;
1919         struct dst_entry *dst;
1920
1921         if (type == ICMPV6_MGM_REDUCTION)
1922                 snd_addr = &in6addr_linklocal_allrouters;
1923         else
1924                 snd_addr = addr;
1925
1926         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1927         payload_len = len + sizeof(ra);
1928         full_len = sizeof(struct ipv6hdr) + payload_len;
1929
1930         rcu_read_lock();
1931         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1932                       IPSTATS_MIB_OUT, full_len);
1933         rcu_read_unlock();
1934
1935         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1936
1937         if (skb == NULL) {
1938                 rcu_read_lock();
1939                 IP6_INC_STATS(net, __in6_dev_get(dev),
1940                               IPSTATS_MIB_OUTDISCARDS);
1941                 rcu_read_unlock();
1942                 return;
1943         }
1944         skb->priority = TC_PRIO_CONTROL;
1945         skb_reserve(skb, hlen);
1946
1947         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1948                 /* <draft-ietf-magma-mld-source-05.txt>:
1949                  * use unspecified address as the source address
1950                  * when a valid link-local address is not available.
1951                  */
1952                 saddr = &in6addr_any;
1953         } else
1954                 saddr = &addr_buf;
1955
1956         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1957
1958         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1959
1960         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1961         memset(hdr, 0, sizeof(struct mld_msg));
1962         hdr->mld_type = type;
1963         hdr->mld_mca = *addr;
1964
1965         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1966                                          IPPROTO_ICMPV6,
1967                                          csum_partial(hdr, len, 0));
1968
1969         rcu_read_lock();
1970         idev = __in6_dev_get(skb->dev);
1971
1972         icmpv6_flow_init(sk, &fl6, type,
1973                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1974                          skb->dev->ifindex);
1975         dst = icmp6_dst_alloc(skb->dev, &fl6);
1976         if (IS_ERR(dst)) {
1977                 err = PTR_ERR(dst);
1978                 goto err_out;
1979         }
1980
1981         skb_dst_set(skb, dst);
1982         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1983                       dst_output);
1984 out:
1985         if (!err) {
1986                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1987                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1988                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1989         } else
1990                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1991
1992         rcu_read_unlock();
1993         return;
1994
1995 err_out:
1996         kfree_skb(skb);
1997         goto out;
1998 }
1999
2000 static void mld_send_initial_cr(struct inet6_dev *idev)
2001 {
2002         struct sk_buff *skb;
2003         struct ifmcaddr6 *pmc;
2004         int type;
2005
2006         if (mld_in_v1_mode(idev))
2007                 return;
2008
2009         skb = NULL;
2010         read_lock_bh(&idev->lock);
2011         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2012                 spin_lock_bh(&pmc->mca_lock);
2013                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2014                         type = MLD2_CHANGE_TO_EXCLUDE;
2015                 else
2016                         type = MLD2_CHANGE_TO_INCLUDE;
2017                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2018                 spin_unlock_bh(&pmc->mca_lock);
2019         }
2020         read_unlock_bh(&idev->lock);
2021         if (skb)
2022                 mld_sendpack(skb);
2023 }
2024
2025 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2026 {
2027         idev->mc_dad_count = idev->mc_qrv;
2028         if (idev->mc_dad_count) {
2029                 mld_send_initial_cr(idev);
2030                 idev->mc_dad_count--;
2031                 if (idev->mc_dad_count)
2032                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2033         }
2034 }
2035
2036 static void mld_dad_timer_expire(unsigned long data)
2037 {
2038         struct inet6_dev *idev = (struct inet6_dev *)data;
2039
2040         mld_send_initial_cr(idev);
2041         if (idev->mc_dad_count) {
2042                 idev->mc_dad_count--;
2043                 if (idev->mc_dad_count)
2044                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2045         }
2046         in6_dev_put(idev);
2047 }
2048
2049 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2050         const struct in6_addr *psfsrc)
2051 {
2052         struct ip6_sf_list *psf, *psf_prev;
2053         int rv = 0;
2054
2055         psf_prev = NULL;
2056         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2057                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2058                         break;
2059                 psf_prev = psf;
2060         }
2061         if (!psf || psf->sf_count[sfmode] == 0) {
2062                 /* source filter not found, or count wrong =>  bug */
2063                 return -ESRCH;
2064         }
2065         psf->sf_count[sfmode]--;
2066         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2067                 struct inet6_dev *idev = pmc->idev;
2068
2069                 /* no more filters for this source */
2070                 if (psf_prev)
2071                         psf_prev->sf_next = psf->sf_next;
2072                 else
2073                         pmc->mca_sources = psf->sf_next;
2074                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2075                     !mld_in_v1_mode(idev)) {
2076                         psf->sf_crcount = idev->mc_qrv;
2077                         psf->sf_next = pmc->mca_tomb;
2078                         pmc->mca_tomb = psf;
2079                         rv = 1;
2080                 } else
2081                         kfree(psf);
2082         }
2083         return rv;
2084 }
2085
2086 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2087                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2088                           int delta)
2089 {
2090         struct ifmcaddr6 *pmc;
2091         int     changerec = 0;
2092         int     i, err;
2093
2094         if (!idev)
2095                 return -ENODEV;
2096         read_lock_bh(&idev->lock);
2097         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2098                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2099                         break;
2100         }
2101         if (!pmc) {
2102                 /* MCA not found?? bug */
2103                 read_unlock_bh(&idev->lock);
2104                 return -ESRCH;
2105         }
2106         spin_lock_bh(&pmc->mca_lock);
2107         sf_markstate(pmc);
2108         if (!delta) {
2109                 if (!pmc->mca_sfcount[sfmode]) {
2110                         spin_unlock_bh(&pmc->mca_lock);
2111                         read_unlock_bh(&idev->lock);
2112                         return -EINVAL;
2113                 }
2114                 pmc->mca_sfcount[sfmode]--;
2115         }
2116         err = 0;
2117         for (i=0; i<sfcount; i++) {
2118                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2119
2120                 changerec |= rv > 0;
2121                 if (!err && rv < 0)
2122                         err = rv;
2123         }
2124         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2125             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2126             pmc->mca_sfcount[MCAST_INCLUDE]) {
2127                 struct ip6_sf_list *psf;
2128
2129                 /* filter mode change */
2130                 pmc->mca_sfmode = MCAST_INCLUDE;
2131                 pmc->mca_crcount = idev->mc_qrv;
2132                 idev->mc_ifc_count = pmc->mca_crcount;
2133                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2134                         psf->sf_crcount = 0;
2135                 mld_ifc_event(pmc->idev);
2136         } else if (sf_setstate(pmc) || changerec)
2137                 mld_ifc_event(pmc->idev);
2138         spin_unlock_bh(&pmc->mca_lock);
2139         read_unlock_bh(&idev->lock);
2140         return err;
2141 }
2142
2143 /*
2144  * Add multicast single-source filter to the interface list
2145  */
2146 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2147         const struct in6_addr *psfsrc)
2148 {
2149         struct ip6_sf_list *psf, *psf_prev;
2150
2151         psf_prev = NULL;
2152         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2153                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2154                         break;
2155                 psf_prev = psf;
2156         }
2157         if (!psf) {
2158                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2159                 if (!psf)
2160                         return -ENOBUFS;
2161
2162                 psf->sf_addr = *psfsrc;
2163                 if (psf_prev) {
2164                         psf_prev->sf_next = psf;
2165                 } else
2166                         pmc->mca_sources = psf;
2167         }
2168         psf->sf_count[sfmode]++;
2169         return 0;
2170 }
2171
2172 static void sf_markstate(struct ifmcaddr6 *pmc)
2173 {
2174         struct ip6_sf_list *psf;
2175         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2176
2177         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2178                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2179                         psf->sf_oldin = mca_xcount ==
2180                                 psf->sf_count[MCAST_EXCLUDE] &&
2181                                 !psf->sf_count[MCAST_INCLUDE];
2182                 } else
2183                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2184 }
2185
2186 static int sf_setstate(struct ifmcaddr6 *pmc)
2187 {
2188         struct ip6_sf_list *psf, *dpsf;
2189         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2190         int qrv = pmc->idev->mc_qrv;
2191         int new_in, rv;
2192
2193         rv = 0;
2194         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2195                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2196                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2197                                 !psf->sf_count[MCAST_INCLUDE];
2198                 } else
2199                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2200                 if (new_in) {
2201                         if (!psf->sf_oldin) {
2202                                 struct ip6_sf_list *prev = NULL;
2203
2204                                 for (dpsf=pmc->mca_tomb; dpsf;
2205                                      dpsf=dpsf->sf_next) {
2206                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2207                                             &psf->sf_addr))
2208                                                 break;
2209                                         prev = dpsf;
2210                                 }
2211                                 if (dpsf) {
2212                                         if (prev)
2213                                                 prev->sf_next = dpsf->sf_next;
2214                                         else
2215                                                 pmc->mca_tomb = dpsf->sf_next;
2216                                         kfree(dpsf);
2217                                 }
2218                                 psf->sf_crcount = qrv;
2219                                 rv++;
2220                         }
2221                 } else if (psf->sf_oldin) {
2222                         psf->sf_crcount = 0;
2223                         /*
2224                          * add or update "delete" records if an active filter
2225                          * is now inactive
2226                          */
2227                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2228                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2229                                     &psf->sf_addr))
2230                                         break;
2231                         if (!dpsf) {
2232                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2233                                 if (!dpsf)
2234                                         continue;
2235                                 *dpsf = *psf;
2236                                 /* pmc->mca_lock held by callers */
2237                                 dpsf->sf_next = pmc->mca_tomb;
2238                                 pmc->mca_tomb = dpsf;
2239                         }
2240                         dpsf->sf_crcount = qrv;
2241                         rv++;
2242                 }
2243         }
2244         return rv;
2245 }
2246
2247 /*
2248  * Add multicast source filter list to the interface list
2249  */
2250 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2251                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2252                           int delta)
2253 {
2254         struct ifmcaddr6 *pmc;
2255         int     isexclude;
2256         int     i, err;
2257
2258         if (!idev)
2259                 return -ENODEV;
2260         read_lock_bh(&idev->lock);
2261         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2262                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2263                         break;
2264         }
2265         if (!pmc) {
2266                 /* MCA not found?? bug */
2267                 read_unlock_bh(&idev->lock);
2268                 return -ESRCH;
2269         }
2270         spin_lock_bh(&pmc->mca_lock);
2271
2272         sf_markstate(pmc);
2273         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2274         if (!delta)
2275                 pmc->mca_sfcount[sfmode]++;
2276         err = 0;
2277         for (i=0; i<sfcount; i++) {
2278                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2279                 if (err)
2280                         break;
2281         }
2282         if (err) {
2283                 int j;
2284
2285                 if (!delta)
2286                         pmc->mca_sfcount[sfmode]--;
2287                 for (j=0; j<i; j++)
2288                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2289         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2290                 struct ip6_sf_list *psf;
2291
2292                 /* filter mode change */
2293                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2294                         pmc->mca_sfmode = MCAST_EXCLUDE;
2295                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2296                         pmc->mca_sfmode = MCAST_INCLUDE;
2297                 /* else no filters; keep old mode for reports */
2298
2299                 pmc->mca_crcount = idev->mc_qrv;
2300                 idev->mc_ifc_count = pmc->mca_crcount;
2301                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2302                         psf->sf_crcount = 0;
2303                 mld_ifc_event(idev);
2304         } else if (sf_setstate(pmc))
2305                 mld_ifc_event(idev);
2306         spin_unlock_bh(&pmc->mca_lock);
2307         read_unlock_bh(&idev->lock);
2308         return err;
2309 }
2310
2311 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2312 {
2313         struct ip6_sf_list *psf, *nextpsf;
2314
2315         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2316                 nextpsf = psf->sf_next;
2317                 kfree(psf);
2318         }
2319         pmc->mca_tomb = NULL;
2320         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2321                 nextpsf = psf->sf_next;
2322                 kfree(psf);
2323         }
2324         pmc->mca_sources = NULL;
2325         pmc->mca_sfmode = MCAST_EXCLUDE;
2326         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2327         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2328 }
2329
2330
2331 static void igmp6_join_group(struct ifmcaddr6 *ma)
2332 {
2333         unsigned long delay;
2334
2335         if (ma->mca_flags & MAF_NOREPORT)
2336                 return;
2337
2338         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2339
2340         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2341
2342         spin_lock_bh(&ma->mca_lock);
2343         if (del_timer(&ma->mca_timer)) {
2344                 atomic_dec(&ma->mca_refcnt);
2345                 delay = ma->mca_timer.expires - jiffies;
2346         }
2347
2348         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2349                 atomic_inc(&ma->mca_refcnt);
2350         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2351         spin_unlock_bh(&ma->mca_lock);
2352 }
2353
2354 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2355                             struct inet6_dev *idev)
2356 {
2357         int err;
2358
2359         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2360          * so no other readers or writers of iml or its sflist
2361          */
2362         if (!iml->sflist) {
2363                 /* any-source empty exclude case */
2364                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2365         }
2366         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2367                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2368         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2369         iml->sflist = NULL;
2370         return err;
2371 }
2372
2373 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2374 {
2375         if (mld_in_v1_mode(ma->idev)) {
2376                 if (ma->mca_flags & MAF_LAST_REPORTER)
2377                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2378                                 ICMPV6_MGM_REDUCTION);
2379         } else {
2380                 mld_add_delrec(ma->idev, ma);
2381                 mld_ifc_event(ma->idev);
2382         }
2383 }
2384
2385 static void mld_gq_timer_expire(unsigned long data)
2386 {
2387         struct inet6_dev *idev = (struct inet6_dev *)data;
2388
2389         idev->mc_gq_running = 0;
2390         mld_send_report(idev, NULL);
2391         in6_dev_put(idev);
2392 }
2393
2394 static void mld_ifc_timer_expire(unsigned long data)
2395 {
2396         struct inet6_dev *idev = (struct inet6_dev *)data;
2397
2398         mld_send_cr(idev);
2399         if (idev->mc_ifc_count) {
2400                 idev->mc_ifc_count--;
2401                 if (idev->mc_ifc_count)
2402                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2403         }
2404         in6_dev_put(idev);
2405 }
2406
2407 static void mld_ifc_event(struct inet6_dev *idev)
2408 {
2409         if (mld_in_v1_mode(idev))
2410                 return;
2411         idev->mc_ifc_count = idev->mc_qrv;
2412         mld_ifc_start_timer(idev, 1);
2413 }
2414
2415
2416 static void igmp6_timer_handler(unsigned long data)
2417 {
2418         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2419
2420         if (mld_in_v1_mode(ma->idev))
2421                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2422         else
2423                 mld_send_report(ma->idev, ma);
2424
2425         spin_lock(&ma->mca_lock);
2426         ma->mca_flags |=  MAF_LAST_REPORTER;
2427         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2428         spin_unlock(&ma->mca_lock);
2429         ma_put(ma);
2430 }
2431
2432 /* Device changing type */
2433
2434 void ipv6_mc_unmap(struct inet6_dev *idev)
2435 {
2436         struct ifmcaddr6 *i;
2437
2438         /* Install multicast list, except for all-nodes (already installed) */
2439
2440         read_lock_bh(&idev->lock);
2441         for (i = idev->mc_list; i; i = i->next)
2442                 igmp6_group_dropped(i);
2443         read_unlock_bh(&idev->lock);
2444 }
2445
2446 void ipv6_mc_remap(struct inet6_dev *idev)
2447 {
2448         ipv6_mc_up(idev);
2449 }
2450
2451 /* Device going down */
2452
2453 void ipv6_mc_down(struct inet6_dev *idev)
2454 {
2455         struct ifmcaddr6 *i;
2456
2457         /* Withdraw multicast list */
2458
2459         read_lock_bh(&idev->lock);
2460         mld_ifc_stop_timer(idev);
2461         mld_gq_stop_timer(idev);
2462         mld_dad_stop_timer(idev);
2463
2464         for (i = idev->mc_list; i; i=i->next)
2465                 igmp6_group_dropped(i);
2466         read_unlock_bh(&idev->lock);
2467
2468         mld_clear_delrec(idev);
2469 }
2470
2471
2472 /* Device going up */
2473
2474 void ipv6_mc_up(struct inet6_dev *idev)
2475 {
2476         struct ifmcaddr6 *i;
2477
2478         /* Install multicast list, except for all-nodes (already installed) */
2479
2480         read_lock_bh(&idev->lock);
2481         for (i = idev->mc_list; i; i=i->next)
2482                 igmp6_group_added(i);
2483         read_unlock_bh(&idev->lock);
2484 }
2485
2486 /* IPv6 device initialization. */
2487
2488 void ipv6_mc_init_dev(struct inet6_dev *idev)
2489 {
2490         write_lock_bh(&idev->lock);
2491         spin_lock_init(&idev->mc_lock);
2492         idev->mc_gq_running = 0;
2493         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2494                         (unsigned long)idev);
2495         idev->mc_tomb = NULL;
2496         idev->mc_ifc_count = 0;
2497         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2498                         (unsigned long)idev);
2499         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2500                     (unsigned long)idev);
2501
2502         idev->mc_qrv = MLD_QRV_DEFAULT;
2503         idev->mc_qi = MLD_QI_DEFAULT;
2504         idev->mc_qri = MLD_QRI_DEFAULT;
2505
2506         idev->mc_maxdelay = unsolicited_report_interval(idev);
2507         idev->mc_v1_seen = 0;
2508         write_unlock_bh(&idev->lock);
2509 }
2510
2511 /*
2512  *      Device is about to be destroyed: clean up.
2513  */
2514
2515 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2516 {
2517         struct ifmcaddr6 *i;
2518
2519         /* Deactivate timers */
2520         ipv6_mc_down(idev);
2521
2522         /* Delete all-nodes address. */
2523         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2524          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2525          * fail.
2526          */
2527         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2528
2529         if (idev->cnf.forwarding)
2530                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2531
2532         write_lock_bh(&idev->lock);
2533         while ((i = idev->mc_list) != NULL) {
2534                 idev->mc_list = i->next;
2535                 write_unlock_bh(&idev->lock);
2536
2537                 igmp6_group_dropped(i);
2538                 ma_put(i);
2539
2540                 write_lock_bh(&idev->lock);
2541         }
2542         write_unlock_bh(&idev->lock);
2543 }
2544
2545 #ifdef CONFIG_PROC_FS
2546 struct igmp6_mc_iter_state {
2547         struct seq_net_private p;
2548         struct net_device *dev;
2549         struct inet6_dev *idev;
2550 };
2551
2552 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2553
2554 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2555 {
2556         struct ifmcaddr6 *im = NULL;
2557         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2558         struct net *net = seq_file_net(seq);
2559
2560         state->idev = NULL;
2561         for_each_netdev_rcu(net, state->dev) {
2562                 struct inet6_dev *idev;
2563                 idev = __in6_dev_get(state->dev);
2564                 if (!idev)
2565                         continue;
2566                 read_lock_bh(&idev->lock);
2567                 im = idev->mc_list;
2568                 if (im) {
2569                         state->idev = idev;
2570                         break;
2571                 }
2572                 read_unlock_bh(&idev->lock);
2573         }
2574         return im;
2575 }
2576
2577 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2578 {
2579         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2580
2581         im = im->next;
2582         while (!im) {
2583                 if (likely(state->idev != NULL))
2584                         read_unlock_bh(&state->idev->lock);
2585
2586                 state->dev = next_net_device_rcu(state->dev);
2587                 if (!state->dev) {
2588                         state->idev = NULL;
2589                         break;
2590                 }
2591                 state->idev = __in6_dev_get(state->dev);
2592                 if (!state->idev)
2593                         continue;
2594                 read_lock_bh(&state->idev->lock);
2595                 im = state->idev->mc_list;
2596         }
2597         return im;
2598 }
2599
2600 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2601 {
2602         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2603         if (im)
2604                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2605                         --pos;
2606         return pos ? NULL : im;
2607 }
2608
2609 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2610         __acquires(RCU)
2611 {
2612         rcu_read_lock();
2613         return igmp6_mc_get_idx(seq, *pos);
2614 }
2615
2616 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2617 {
2618         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2619
2620         ++*pos;
2621         return im;
2622 }
2623
2624 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2625         __releases(RCU)
2626 {
2627         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2628
2629         if (likely(state->idev != NULL)) {
2630                 read_unlock_bh(&state->idev->lock);
2631                 state->idev = NULL;
2632         }
2633         state->dev = NULL;
2634         rcu_read_unlock();
2635 }
2636
2637 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2638 {
2639         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2640         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2641
2642         seq_printf(seq,
2643                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2644                    state->dev->ifindex, state->dev->name,
2645                    &im->mca_addr,
2646                    im->mca_users, im->mca_flags,
2647                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2648                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2649         return 0;
2650 }
2651
2652 static const struct seq_operations igmp6_mc_seq_ops = {
2653         .start  =       igmp6_mc_seq_start,
2654         .next   =       igmp6_mc_seq_next,
2655         .stop   =       igmp6_mc_seq_stop,
2656         .show   =       igmp6_mc_seq_show,
2657 };
2658
2659 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2660 {
2661         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2662                             sizeof(struct igmp6_mc_iter_state));
2663 }
2664
2665 static const struct file_operations igmp6_mc_seq_fops = {
2666         .owner          =       THIS_MODULE,
2667         .open           =       igmp6_mc_seq_open,
2668         .read           =       seq_read,
2669         .llseek         =       seq_lseek,
2670         .release        =       seq_release_net,
2671 };
2672
2673 struct igmp6_mcf_iter_state {
2674         struct seq_net_private p;
2675         struct net_device *dev;
2676         struct inet6_dev *idev;
2677         struct ifmcaddr6 *im;
2678 };
2679
2680 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2681
2682 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2683 {
2684         struct ip6_sf_list *psf = NULL;
2685         struct ifmcaddr6 *im = NULL;
2686         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2687         struct net *net = seq_file_net(seq);
2688
2689         state->idev = NULL;
2690         state->im = NULL;
2691         for_each_netdev_rcu(net, state->dev) {
2692                 struct inet6_dev *idev;
2693                 idev = __in6_dev_get(state->dev);
2694                 if (unlikely(idev == NULL))
2695                         continue;
2696                 read_lock_bh(&idev->lock);
2697                 im = idev->mc_list;
2698                 if (likely(im != NULL)) {
2699                         spin_lock_bh(&im->mca_lock);
2700                         psf = im->mca_sources;
2701                         if (likely(psf != NULL)) {
2702                                 state->im = im;
2703                                 state->idev = idev;
2704                                 break;
2705                         }
2706                         spin_unlock_bh(&im->mca_lock);
2707                 }
2708                 read_unlock_bh(&idev->lock);
2709         }
2710         return psf;
2711 }
2712
2713 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2714 {
2715         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2716
2717         psf = psf->sf_next;
2718         while (!psf) {
2719                 spin_unlock_bh(&state->im->mca_lock);
2720                 state->im = state->im->next;
2721                 while (!state->im) {
2722                         if (likely(state->idev != NULL))
2723                                 read_unlock_bh(&state->idev->lock);
2724
2725                         state->dev = next_net_device_rcu(state->dev);
2726                         if (!state->dev) {
2727                                 state->idev = NULL;
2728                                 goto out;
2729                         }
2730                         state->idev = __in6_dev_get(state->dev);
2731                         if (!state->idev)
2732                                 continue;
2733                         read_lock_bh(&state->idev->lock);
2734                         state->im = state->idev->mc_list;
2735                 }
2736                 if (!state->im)
2737                         break;
2738                 spin_lock_bh(&state->im->mca_lock);
2739                 psf = state->im->mca_sources;
2740         }
2741 out:
2742         return psf;
2743 }
2744
2745 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2746 {
2747         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2748         if (psf)
2749                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2750                         --pos;
2751         return pos ? NULL : psf;
2752 }
2753
2754 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2755         __acquires(RCU)
2756 {
2757         rcu_read_lock();
2758         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2759 }
2760
2761 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2762 {
2763         struct ip6_sf_list *psf;
2764         if (v == SEQ_START_TOKEN)
2765                 psf = igmp6_mcf_get_first(seq);
2766         else
2767                 psf = igmp6_mcf_get_next(seq, v);
2768         ++*pos;
2769         return psf;
2770 }
2771
2772 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2773         __releases(RCU)
2774 {
2775         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2776         if (likely(state->im != NULL)) {
2777                 spin_unlock_bh(&state->im->mca_lock);
2778                 state->im = NULL;
2779         }
2780         if (likely(state->idev != NULL)) {
2781                 read_unlock_bh(&state->idev->lock);
2782                 state->idev = NULL;
2783         }
2784         state->dev = NULL;
2785         rcu_read_unlock();
2786 }
2787
2788 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2789 {
2790         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2791         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2792
2793         if (v == SEQ_START_TOKEN) {
2794                 seq_printf(seq,
2795                            "%3s %6s "
2796                            "%32s %32s %6s %6s\n", "Idx",
2797                            "Device", "Multicast Address",
2798                            "Source Address", "INC", "EXC");
2799         } else {
2800                 seq_printf(seq,
2801                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2802                            state->dev->ifindex, state->dev->name,
2803                            &state->im->mca_addr,
2804                            &psf->sf_addr,
2805                            psf->sf_count[MCAST_INCLUDE],
2806                            psf->sf_count[MCAST_EXCLUDE]);
2807         }
2808         return 0;
2809 }
2810
2811 static const struct seq_operations igmp6_mcf_seq_ops = {
2812         .start  =       igmp6_mcf_seq_start,
2813         .next   =       igmp6_mcf_seq_next,
2814         .stop   =       igmp6_mcf_seq_stop,
2815         .show   =       igmp6_mcf_seq_show,
2816 };
2817
2818 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2819 {
2820         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2821                             sizeof(struct igmp6_mcf_iter_state));
2822 }
2823
2824 static const struct file_operations igmp6_mcf_seq_fops = {
2825         .owner          =       THIS_MODULE,
2826         .open           =       igmp6_mcf_seq_open,
2827         .read           =       seq_read,
2828         .llseek         =       seq_lseek,
2829         .release        =       seq_release_net,
2830 };
2831
2832 static int __net_init igmp6_proc_init(struct net *net)
2833 {
2834         int err;
2835
2836         err = -ENOMEM;
2837         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2838                 goto out;
2839         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2840                          &igmp6_mcf_seq_fops))
2841                 goto out_proc_net_igmp6;
2842
2843         err = 0;
2844 out:
2845         return err;
2846
2847 out_proc_net_igmp6:
2848         remove_proc_entry("igmp6", net->proc_net);
2849         goto out;
2850 }
2851
2852 static void __net_exit igmp6_proc_exit(struct net *net)
2853 {
2854         remove_proc_entry("mcfilter6", net->proc_net);
2855         remove_proc_entry("igmp6", net->proc_net);
2856 }
2857 #else
2858 static inline int igmp6_proc_init(struct net *net)
2859 {
2860         return 0;
2861 }
2862 static inline void igmp6_proc_exit(struct net *net)
2863 {
2864 }
2865 #endif
2866
2867 static int __net_init igmp6_net_init(struct net *net)
2868 {
2869         int err;
2870
2871         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2872                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2873         if (err < 0) {
2874                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2875                        err);
2876                 goto out;
2877         }
2878
2879         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2880
2881         err = igmp6_proc_init(net);
2882         if (err)
2883                 goto out_sock_create;
2884 out:
2885         return err;
2886
2887 out_sock_create:
2888         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2889         goto out;
2890 }
2891
2892 static void __net_exit igmp6_net_exit(struct net *net)
2893 {
2894         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2895         igmp6_proc_exit(net);
2896 }
2897
2898 static struct pernet_operations igmp6_net_ops = {
2899         .init = igmp6_net_init,
2900         .exit = igmp6_net_exit,
2901 };
2902
2903 int __init igmp6_init(void)
2904 {
2905         return register_pernet_subsys(&igmp6_net_ops);
2906 }
2907
2908 void igmp6_cleanup(void)
2909 {
2910         unregister_pernet_subsys(&igmp6_net_ops);
2911 }