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 = net_random() % 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_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1010 {
1011         unsigned long tv = net_random() % delay;
1012
1013         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1014                 in6_dev_hold(idev);
1015 }
1016
1017 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1018 {
1019         unsigned long tv = net_random() % delay;
1020
1021         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1022                 in6_dev_hold(idev);
1023 }
1024
1025 /*
1026  *      IGMP handling (alias multicast ICMPv6 messages)
1027  */
1028
1029 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1030 {
1031         unsigned long delay = resptime;
1032
1033         /* Do not start timer for these addresses */
1034         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1035             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1036                 return;
1037
1038         if (del_timer(&ma->mca_timer)) {
1039                 atomic_dec(&ma->mca_refcnt);
1040                 delay = ma->mca_timer.expires - jiffies;
1041         }
1042
1043         if (delay >= resptime) {
1044                 if (resptime)
1045                         delay = net_random() % resptime;
1046                 else
1047                         delay = 1;
1048         }
1049         ma->mca_timer.expires = jiffies + delay;
1050         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1051                 atomic_inc(&ma->mca_refcnt);
1052         ma->mca_flags |= MAF_TIMER_RUNNING;
1053 }
1054
1055 /* mark EXCLUDE-mode sources */
1056 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1057                              const struct in6_addr *srcs)
1058 {
1059         struct ip6_sf_list *psf;
1060         int i, scount;
1061
1062         scount = 0;
1063         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1064                 if (scount == nsrcs)
1065                         break;
1066                 for (i=0; i<nsrcs; i++) {
1067                         /* skip inactive filters */
1068                         if (psf->sf_count[MCAST_INCLUDE] ||
1069                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1070                             psf->sf_count[MCAST_EXCLUDE])
1071                                 break;
1072                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1073                                 scount++;
1074                                 break;
1075                         }
1076                 }
1077         }
1078         pmc->mca_flags &= ~MAF_GSQUERY;
1079         if (scount == nsrcs)    /* all sources excluded */
1080                 return false;
1081         return true;
1082 }
1083
1084 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1085                             const struct in6_addr *srcs)
1086 {
1087         struct ip6_sf_list *psf;
1088         int i, scount;
1089
1090         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1091                 return mld_xmarksources(pmc, nsrcs, srcs);
1092
1093         /* mark INCLUDE-mode sources */
1094
1095         scount = 0;
1096         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1097                 if (scount == nsrcs)
1098                         break;
1099                 for (i=0; i<nsrcs; i++) {
1100                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1101                                 psf->sf_gsresp = 1;
1102                                 scount++;
1103                                 break;
1104                         }
1105                 }
1106         }
1107         if (!scount) {
1108                 pmc->mca_flags &= ~MAF_GSQUERY;
1109                 return false;
1110         }
1111         pmc->mca_flags |= MAF_GSQUERY;
1112         return true;
1113 }
1114
1115 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1116 {
1117         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version == 1)
1118                 return true;
1119         if (idev->cnf.force_mld_version == 1)
1120                 return true;
1121         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1122                 return true;
1123
1124         return false;
1125 }
1126
1127 static void mld_set_v1_mode(struct inet6_dev *idev)
1128 {
1129         /* RFC3810, relevant sections:
1130          *  - 9.1. Robustness Variable
1131          *  - 9.2. Query Interval
1132          *  - 9.3. Query Response Interval
1133          *  - 9.12. Older Version Querier Present Timeout
1134          */
1135         unsigned long switchback;
1136
1137         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1138
1139         idev->mc_v1_seen = jiffies + switchback;
1140 }
1141
1142 static void mld_update_qrv(struct inet6_dev *idev,
1143                            const struct mld2_query *mlh2)
1144 {
1145         /* RFC3810, relevant sections:
1146          *  - 5.1.8. QRV (Querier's Robustness Variable)
1147          *  - 9.1. Robustness Variable
1148          */
1149
1150         /* The value of the Robustness Variable MUST NOT be zero,
1151          * and SHOULD NOT be one. Catch this here if we ever run
1152          * into such a case in future.
1153          */
1154         WARN_ON(idev->mc_qrv == 0);
1155
1156         if (mlh2->mld2q_qrv > 0)
1157                 idev->mc_qrv = mlh2->mld2q_qrv;
1158
1159         if (unlikely(idev->mc_qrv < 2)) {
1160                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1161                                      idev->mc_qrv, MLD_QRV_DEFAULT);
1162                 idev->mc_qrv = MLD_QRV_DEFAULT;
1163         }
1164 }
1165
1166 static void mld_update_qi(struct inet6_dev *idev,
1167                           const struct mld2_query *mlh2)
1168 {
1169         /* RFC3810, relevant sections:
1170          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1171          *  - 9.2. Query Interval
1172          *  - 9.12. Older Version Querier Present Timeout
1173          *    (the [Query Interval] in the last Query received)
1174          */
1175         unsigned long mc_qqi;
1176
1177         if (mlh2->mld2q_qqic < 128) {
1178                 mc_qqi = mlh2->mld2q_qqic;
1179         } else {
1180                 unsigned long mc_man, mc_exp;
1181
1182                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1183                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1184
1185                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1186         }
1187
1188         idev->mc_qi = mc_qqi * HZ;
1189 }
1190
1191 static void mld_update_qri(struct inet6_dev *idev,
1192                            const struct mld2_query *mlh2)
1193 {
1194         /* RFC3810, relevant sections:
1195          *  - 5.1.3. Maximum Response Code
1196          *  - 9.3. Query Response Interval
1197          */
1198         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1199 }
1200
1201 /* called with rcu_read_lock() */
1202 int igmp6_event_query(struct sk_buff *skb)
1203 {
1204         struct mld2_query *mlh2 = NULL;
1205         struct ifmcaddr6 *ma;
1206         const struct in6_addr *group;
1207         unsigned long max_delay;
1208         struct inet6_dev *idev;
1209         struct mld_msg *mld;
1210         int group_type;
1211         int mark = 0;
1212         int len;
1213
1214         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1215                 return -EINVAL;
1216
1217         /* compute payload length excluding extension headers */
1218         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1219         len -= skb_network_header_len(skb);
1220
1221         /* Drop queries with not link local source */
1222         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1223                 return -EINVAL;
1224
1225         idev = __in6_dev_get(skb->dev);
1226
1227         if (idev == NULL)
1228                 return 0;
1229
1230         mld = (struct mld_msg *)icmp6_hdr(skb);
1231         group = &mld->mld_mca;
1232         group_type = ipv6_addr_type(group);
1233
1234         if (group_type != IPV6_ADDR_ANY &&
1235             !(group_type&IPV6_ADDR_MULTICAST))
1236                 return -EINVAL;
1237
1238         if (len == MLD_V1_QUERY_LEN) {
1239                 /* MLDv1 router present */
1240                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1241
1242                 mld_set_v1_mode(idev);
1243
1244                 /* cancel MLDv2 report timer */
1245                 idev->mc_gq_running = 0;
1246                 if (del_timer(&idev->mc_gq_timer))
1247                         __in6_dev_put(idev);
1248
1249                 /* cancel the interface change timer */
1250                 idev->mc_ifc_count = 0;
1251                 if (del_timer(&idev->mc_ifc_timer))
1252                         __in6_dev_put(idev);
1253                 /* clear deleted report items */
1254                 mld_clear_delrec(idev);
1255         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1256                 int srcs_offset = sizeof(struct mld2_query) -
1257                                   sizeof(struct icmp6hdr);
1258
1259                 /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1260                 if (mld_in_v1_mode(idev))
1261                         return 0;
1262                 if (!pskb_may_pull(skb, srcs_offset))
1263                         return -EINVAL;
1264
1265                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1266
1267                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mlh2)), 1UL);
1268                 idev->mc_maxdelay = max_delay;
1269
1270                 mld_update_qrv(idev, mlh2);
1271                 mld_update_qi(idev, mlh2);
1272                 mld_update_qri(idev, mlh2);
1273
1274                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1275                         if (mlh2->mld2q_nsrcs)
1276                                 return -EINVAL; /* no sources allowed */
1277
1278                         mld_gq_start_timer(idev);
1279                         return 0;
1280                 }
1281                 /* mark sources to include, if group & source-specific */
1282                 if (mlh2->mld2q_nsrcs != 0) {
1283                         if (!pskb_may_pull(skb, srcs_offset +
1284                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1285                                 return -EINVAL;
1286
1287                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1288                         mark = 1;
1289                 }
1290         } else
1291                 return -EINVAL;
1292
1293         read_lock_bh(&idev->lock);
1294         if (group_type == IPV6_ADDR_ANY) {
1295                 for (ma = idev->mc_list; ma; ma=ma->next) {
1296                         spin_lock_bh(&ma->mca_lock);
1297                         igmp6_group_queried(ma, max_delay);
1298                         spin_unlock_bh(&ma->mca_lock);
1299                 }
1300         } else {
1301                 for (ma = idev->mc_list; ma; ma=ma->next) {
1302                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1303                                 continue;
1304                         spin_lock_bh(&ma->mca_lock);
1305                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1306                                 /* gsquery <- gsquery && mark */
1307                                 if (!mark)
1308                                         ma->mca_flags &= ~MAF_GSQUERY;
1309                         } else {
1310                                 /* gsquery <- mark */
1311                                 if (mark)
1312                                         ma->mca_flags |= MAF_GSQUERY;
1313                                 else
1314                                         ma->mca_flags &= ~MAF_GSQUERY;
1315                         }
1316                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1317                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1318                                 igmp6_group_queried(ma, max_delay);
1319                         spin_unlock_bh(&ma->mca_lock);
1320                         break;
1321                 }
1322         }
1323         read_unlock_bh(&idev->lock);
1324
1325         return 0;
1326 }
1327
1328 /* called with rcu_read_lock() */
1329 int igmp6_event_report(struct sk_buff *skb)
1330 {
1331         struct ifmcaddr6 *ma;
1332         struct inet6_dev *idev;
1333         struct mld_msg *mld;
1334         int addr_type;
1335
1336         /* Our own report looped back. Ignore it. */
1337         if (skb->pkt_type == PACKET_LOOPBACK)
1338                 return 0;
1339
1340         /* send our report if the MC router may not have heard this report */
1341         if (skb->pkt_type != PACKET_MULTICAST &&
1342             skb->pkt_type != PACKET_BROADCAST)
1343                 return 0;
1344
1345         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1346                 return -EINVAL;
1347
1348         mld = (struct mld_msg *)icmp6_hdr(skb);
1349
1350         /* Drop reports with not link local source */
1351         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1352         if (addr_type != IPV6_ADDR_ANY &&
1353             !(addr_type&IPV6_ADDR_LINKLOCAL))
1354                 return -EINVAL;
1355
1356         idev = __in6_dev_get(skb->dev);
1357         if (idev == NULL)
1358                 return -ENODEV;
1359
1360         /*
1361          *      Cancel the timer for this group
1362          */
1363
1364         read_lock_bh(&idev->lock);
1365         for (ma = idev->mc_list; ma; ma=ma->next) {
1366                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1367                         spin_lock(&ma->mca_lock);
1368                         if (del_timer(&ma->mca_timer))
1369                                 atomic_dec(&ma->mca_refcnt);
1370                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1371                         spin_unlock(&ma->mca_lock);
1372                         break;
1373                 }
1374         }
1375         read_unlock_bh(&idev->lock);
1376         return 0;
1377 }
1378
1379 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1380                   int gdeleted, int sdeleted)
1381 {
1382         switch (type) {
1383         case MLD2_MODE_IS_INCLUDE:
1384         case MLD2_MODE_IS_EXCLUDE:
1385                 if (gdeleted || sdeleted)
1386                         return false;
1387                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1388                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1389                                 return true;
1390                         /* don't include if this source is excluded
1391                          * in all filters
1392                          */
1393                         if (psf->sf_count[MCAST_INCLUDE])
1394                                 return type == MLD2_MODE_IS_INCLUDE;
1395                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1396                                 psf->sf_count[MCAST_EXCLUDE];
1397                 }
1398                 return false;
1399         case MLD2_CHANGE_TO_INCLUDE:
1400                 if (gdeleted || sdeleted)
1401                         return false;
1402                 return psf->sf_count[MCAST_INCLUDE] != 0;
1403         case MLD2_CHANGE_TO_EXCLUDE:
1404                 if (gdeleted || sdeleted)
1405                         return false;
1406                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1407                     psf->sf_count[MCAST_INCLUDE])
1408                         return false;
1409                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1410                         psf->sf_count[MCAST_EXCLUDE];
1411         case MLD2_ALLOW_NEW_SOURCES:
1412                 if (gdeleted || !psf->sf_crcount)
1413                         return false;
1414                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1415         case MLD2_BLOCK_OLD_SOURCES:
1416                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1417                         return gdeleted || (psf->sf_crcount && sdeleted);
1418                 return psf->sf_crcount && !gdeleted && !sdeleted;
1419         }
1420         return false;
1421 }
1422
1423 static int
1424 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1425 {
1426         struct ip6_sf_list *psf;
1427         int scount = 0;
1428
1429         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1430                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1431                         continue;
1432                 scount++;
1433         }
1434         return scount;
1435 }
1436
1437 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1438                        struct net_device *dev,
1439                        const struct in6_addr *saddr,
1440                        const struct in6_addr *daddr,
1441                        int proto, int len)
1442 {
1443         struct ipv6hdr *hdr;
1444
1445         skb->protocol = htons(ETH_P_IPV6);
1446         skb->dev = dev;
1447
1448         skb_reset_network_header(skb);
1449         skb_put(skb, sizeof(struct ipv6hdr));
1450         hdr = ipv6_hdr(skb);
1451
1452         ip6_flow_hdr(hdr, 0, 0);
1453
1454         hdr->payload_len = htons(len);
1455         hdr->nexthdr = proto;
1456         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1457
1458         hdr->saddr = *saddr;
1459         hdr->daddr = *daddr;
1460 }
1461
1462 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1463 {
1464         struct net_device *dev = idev->dev;
1465         struct net *net = dev_net(dev);
1466         struct sock *sk = net->ipv6.igmp_sk;
1467         struct sk_buff *skb;
1468         struct mld2_report *pmr;
1469         struct in6_addr addr_buf;
1470         const struct in6_addr *saddr;
1471         int hlen = LL_RESERVED_SPACE(dev);
1472         int tlen = dev->needed_tailroom;
1473         int err;
1474         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1475                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1476                      IPV6_TLV_PADN, 0 };
1477
1478         /* we assume size > sizeof(ra) here */
1479         size += hlen + tlen;
1480         /* limit our allocations to order-0 page */
1481         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1482         skb = sock_alloc_send_skb(sk, size, 1, &err);
1483
1484         if (!skb)
1485                 return NULL;
1486
1487         skb->priority = TC_PRIO_CONTROL;
1488         skb_reserve(skb, hlen);
1489
1490         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1491                 /* <draft-ietf-magma-mld-source-05.txt>:
1492                  * use unspecified address as the source address
1493                  * when a valid link-local address is not available.
1494                  */
1495                 saddr = &in6addr_any;
1496         } else
1497                 saddr = &addr_buf;
1498
1499         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1500
1501         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1502
1503         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1504         skb_put(skb, sizeof(*pmr));
1505         pmr = (struct mld2_report *)skb_transport_header(skb);
1506         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1507         pmr->mld2r_resv1 = 0;
1508         pmr->mld2r_cksum = 0;
1509         pmr->mld2r_resv2 = 0;
1510         pmr->mld2r_ngrec = 0;
1511         return skb;
1512 }
1513
1514 static void mld_sendpack(struct sk_buff *skb)
1515 {
1516         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1517         struct mld2_report *pmr =
1518                               (struct mld2_report *)skb_transport_header(skb);
1519         int payload_len, mldlen;
1520         struct inet6_dev *idev;
1521         struct net *net = dev_net(skb->dev);
1522         int err;
1523         struct flowi6 fl6;
1524         struct dst_entry *dst;
1525
1526         rcu_read_lock();
1527         idev = __in6_dev_get(skb->dev);
1528         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1529
1530         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1531                 sizeof(*pip6);
1532         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1533         pip6->payload_len = htons(payload_len);
1534
1535         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1536                                            IPPROTO_ICMPV6,
1537                                            csum_partial(skb_transport_header(skb),
1538                                                         mldlen, 0));
1539
1540         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1541                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1542                          skb->dev->ifindex);
1543         dst = icmp6_dst_alloc(skb->dev, &fl6);
1544
1545         err = 0;
1546         if (IS_ERR(dst)) {
1547                 err = PTR_ERR(dst);
1548                 dst = NULL;
1549         }
1550         skb_dst_set(skb, dst);
1551         if (err)
1552                 goto err_out;
1553
1554         payload_len = skb->len;
1555
1556         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1557                       dst_output);
1558 out:
1559         if (!err) {
1560                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1561                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1562                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1563         } else
1564                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1565
1566         rcu_read_unlock();
1567         return;
1568
1569 err_out:
1570         kfree_skb(skb);
1571         goto out;
1572 }
1573
1574 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1575 {
1576         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1577 }
1578
1579 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1580         int type, struct mld2_grec **ppgr)
1581 {
1582         struct net_device *dev = pmc->idev->dev;
1583         struct mld2_report *pmr;
1584         struct mld2_grec *pgr;
1585
1586         if (!skb)
1587                 skb = mld_newpack(pmc->idev, dev->mtu);
1588         if (!skb)
1589                 return NULL;
1590         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1591         pgr->grec_type = type;
1592         pgr->grec_auxwords = 0;
1593         pgr->grec_nsrcs = 0;
1594         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1595         pmr = (struct mld2_report *)skb_transport_header(skb);
1596         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1597         *ppgr = pgr;
1598         return skb;
1599 }
1600
1601 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1602         skb_tailroom(skb)) : 0)
1603
1604 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1605         int type, int gdeleted, int sdeleted)
1606 {
1607         struct inet6_dev *idev = pmc->idev;
1608         struct net_device *dev = idev->dev;
1609         struct mld2_report *pmr;
1610         struct mld2_grec *pgr = NULL;
1611         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1612         int scount, stotal, first, isquery, truncate;
1613
1614         if (pmc->mca_flags & MAF_NOREPORT)
1615                 return skb;
1616
1617         isquery = type == MLD2_MODE_IS_INCLUDE ||
1618                   type == MLD2_MODE_IS_EXCLUDE;
1619         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1620                     type == MLD2_CHANGE_TO_EXCLUDE;
1621
1622         stotal = scount = 0;
1623
1624         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1625
1626         if (!*psf_list)
1627                 goto empty_source;
1628
1629         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1630
1631         /* EX and TO_EX get a fresh packet, if needed */
1632         if (truncate) {
1633                 if (pmr && pmr->mld2r_ngrec &&
1634                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1635                         if (skb)
1636                                 mld_sendpack(skb);
1637                         skb = mld_newpack(idev, dev->mtu);
1638                 }
1639         }
1640         first = 1;
1641         psf_prev = NULL;
1642         for (psf=*psf_list; psf; psf=psf_next) {
1643                 struct in6_addr *psrc;
1644
1645                 psf_next = psf->sf_next;
1646
1647                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1648                         psf_prev = psf;
1649                         continue;
1650                 }
1651
1652                 /* clear marks on query responses */
1653                 if (isquery)
1654                         psf->sf_gsresp = 0;
1655
1656                 if (AVAILABLE(skb) < sizeof(*psrc) +
1657                     first*sizeof(struct mld2_grec)) {
1658                         if (truncate && !first)
1659                                 break;   /* truncate these */
1660                         if (pgr)
1661                                 pgr->grec_nsrcs = htons(scount);
1662                         if (skb)
1663                                 mld_sendpack(skb);
1664                         skb = mld_newpack(idev, dev->mtu);
1665                         first = 1;
1666                         scount = 0;
1667                 }
1668                 if (first) {
1669                         skb = add_grhead(skb, pmc, type, &pgr);
1670                         first = 0;
1671                 }
1672                 if (!skb)
1673                         return NULL;
1674                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1675                 *psrc = psf->sf_addr;
1676                 scount++; stotal++;
1677                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1678                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1679                         psf->sf_crcount--;
1680                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1681                                 if (psf_prev)
1682                                         psf_prev->sf_next = psf->sf_next;
1683                                 else
1684                                         *psf_list = psf->sf_next;
1685                                 kfree(psf);
1686                                 continue;
1687                         }
1688                 }
1689                 psf_prev = psf;
1690         }
1691
1692 empty_source:
1693         if (!stotal) {
1694                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1695                     type == MLD2_BLOCK_OLD_SOURCES)
1696                         return skb;
1697                 if (pmc->mca_crcount || isquery) {
1698                         /* make sure we have room for group header */
1699                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1700                                 mld_sendpack(skb);
1701                                 skb = NULL; /* add_grhead will get a new one */
1702                         }
1703                         skb = add_grhead(skb, pmc, type, &pgr);
1704                 }
1705         }
1706         if (pgr)
1707                 pgr->grec_nsrcs = htons(scount);
1708
1709         if (isquery)
1710                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1711         return skb;
1712 }
1713
1714 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1715 {
1716         struct sk_buff *skb = NULL;
1717         int type;
1718
1719         read_lock_bh(&idev->lock);
1720         if (!pmc) {
1721                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1722                         if (pmc->mca_flags & MAF_NOREPORT)
1723                                 continue;
1724                         spin_lock_bh(&pmc->mca_lock);
1725                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1726                                 type = MLD2_MODE_IS_EXCLUDE;
1727                         else
1728                                 type = MLD2_MODE_IS_INCLUDE;
1729                         skb = add_grec(skb, pmc, type, 0, 0);
1730                         spin_unlock_bh(&pmc->mca_lock);
1731                 }
1732         } else {
1733                 spin_lock_bh(&pmc->mca_lock);
1734                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1735                         type = MLD2_MODE_IS_EXCLUDE;
1736                 else
1737                         type = MLD2_MODE_IS_INCLUDE;
1738                 skb = add_grec(skb, pmc, type, 0, 0);
1739                 spin_unlock_bh(&pmc->mca_lock);
1740         }
1741         read_unlock_bh(&idev->lock);
1742         if (skb)
1743                 mld_sendpack(skb);
1744 }
1745
1746 /*
1747  * remove zero-count source records from a source filter list
1748  */
1749 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1750 {
1751         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1752
1753         psf_prev = NULL;
1754         for (psf=*ppsf; psf; psf = psf_next) {
1755                 psf_next = psf->sf_next;
1756                 if (psf->sf_crcount == 0) {
1757                         if (psf_prev)
1758                                 psf_prev->sf_next = psf->sf_next;
1759                         else
1760                                 *ppsf = psf->sf_next;
1761                         kfree(psf);
1762                 } else
1763                         psf_prev = psf;
1764         }
1765 }
1766
1767 static void mld_send_cr(struct inet6_dev *idev)
1768 {
1769         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1770         struct sk_buff *skb = NULL;
1771         int type, dtype;
1772
1773         read_lock_bh(&idev->lock);
1774         spin_lock(&idev->mc_lock);
1775
1776         /* deleted MCA's */
1777         pmc_prev = NULL;
1778         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1779                 pmc_next = pmc->next;
1780                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1781                         type = MLD2_BLOCK_OLD_SOURCES;
1782                         dtype = MLD2_BLOCK_OLD_SOURCES;
1783                         skb = add_grec(skb, pmc, type, 1, 0);
1784                         skb = add_grec(skb, pmc, dtype, 1, 1);
1785                 }
1786                 if (pmc->mca_crcount) {
1787                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1788                                 type = MLD2_CHANGE_TO_INCLUDE;
1789                                 skb = add_grec(skb, pmc, type, 1, 0);
1790                         }
1791                         pmc->mca_crcount--;
1792                         if (pmc->mca_crcount == 0) {
1793                                 mld_clear_zeros(&pmc->mca_tomb);
1794                                 mld_clear_zeros(&pmc->mca_sources);
1795                         }
1796                 }
1797                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1798                     !pmc->mca_sources) {
1799                         if (pmc_prev)
1800                                 pmc_prev->next = pmc_next;
1801                         else
1802                                 idev->mc_tomb = pmc_next;
1803                         in6_dev_put(pmc->idev);
1804                         kfree(pmc);
1805                 } else
1806                         pmc_prev = pmc;
1807         }
1808         spin_unlock(&idev->mc_lock);
1809
1810         /* change recs */
1811         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1812                 spin_lock_bh(&pmc->mca_lock);
1813                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1814                         type = MLD2_BLOCK_OLD_SOURCES;
1815                         dtype = MLD2_ALLOW_NEW_SOURCES;
1816                 } else {
1817                         type = MLD2_ALLOW_NEW_SOURCES;
1818                         dtype = MLD2_BLOCK_OLD_SOURCES;
1819                 }
1820                 skb = add_grec(skb, pmc, type, 0, 0);
1821                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1822
1823                 /* filter mode changes */
1824                 if (pmc->mca_crcount) {
1825                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1826                                 type = MLD2_CHANGE_TO_EXCLUDE;
1827                         else
1828                                 type = MLD2_CHANGE_TO_INCLUDE;
1829                         skb = add_grec(skb, pmc, type, 0, 0);
1830                         pmc->mca_crcount--;
1831                 }
1832                 spin_unlock_bh(&pmc->mca_lock);
1833         }
1834         read_unlock_bh(&idev->lock);
1835         if (!skb)
1836                 return;
1837         (void) mld_sendpack(skb);
1838 }
1839
1840 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1841 {
1842         struct net *net = dev_net(dev);
1843         struct sock *sk = net->ipv6.igmp_sk;
1844         struct inet6_dev *idev;
1845         struct sk_buff *skb;
1846         struct mld_msg *hdr;
1847         const struct in6_addr *snd_addr, *saddr;
1848         struct in6_addr addr_buf;
1849         int hlen = LL_RESERVED_SPACE(dev);
1850         int tlen = dev->needed_tailroom;
1851         int err, len, payload_len, full_len;
1852         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1853                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1854                      IPV6_TLV_PADN, 0 };
1855         struct flowi6 fl6;
1856         struct dst_entry *dst;
1857
1858         if (type == ICMPV6_MGM_REDUCTION)
1859                 snd_addr = &in6addr_linklocal_allrouters;
1860         else
1861                 snd_addr = addr;
1862
1863         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1864         payload_len = len + sizeof(ra);
1865         full_len = sizeof(struct ipv6hdr) + payload_len;
1866
1867         rcu_read_lock();
1868         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1869                       IPSTATS_MIB_OUT, full_len);
1870         rcu_read_unlock();
1871
1872         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1873
1874         if (skb == NULL) {
1875                 rcu_read_lock();
1876                 IP6_INC_STATS(net, __in6_dev_get(dev),
1877                               IPSTATS_MIB_OUTDISCARDS);
1878                 rcu_read_unlock();
1879                 return;
1880         }
1881         skb->priority = TC_PRIO_CONTROL;
1882         skb_reserve(skb, hlen);
1883
1884         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1885                 /* <draft-ietf-magma-mld-source-05.txt>:
1886                  * use unspecified address as the source address
1887                  * when a valid link-local address is not available.
1888                  */
1889                 saddr = &in6addr_any;
1890         } else
1891                 saddr = &addr_buf;
1892
1893         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1894
1895         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1896
1897         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1898         memset(hdr, 0, sizeof(struct mld_msg));
1899         hdr->mld_type = type;
1900         hdr->mld_mca = *addr;
1901
1902         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1903                                          IPPROTO_ICMPV6,
1904                                          csum_partial(hdr, len, 0));
1905
1906         rcu_read_lock();
1907         idev = __in6_dev_get(skb->dev);
1908
1909         icmpv6_flow_init(sk, &fl6, type,
1910                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1911                          skb->dev->ifindex);
1912         dst = icmp6_dst_alloc(skb->dev, &fl6);
1913         if (IS_ERR(dst)) {
1914                 err = PTR_ERR(dst);
1915                 goto err_out;
1916         }
1917
1918         skb_dst_set(skb, dst);
1919         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1920                       dst_output);
1921 out:
1922         if (!err) {
1923                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1924                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1925                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1926         } else
1927                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1928
1929         rcu_read_unlock();
1930         return;
1931
1932 err_out:
1933         kfree_skb(skb);
1934         goto out;
1935 }
1936
1937 static void mld_resend_report(struct inet6_dev *idev)
1938 {
1939         if (mld_in_v1_mode(idev)) {
1940                 struct ifmcaddr6 *mcaddr;
1941                 read_lock_bh(&idev->lock);
1942                 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1943                         if (!(mcaddr->mca_flags & MAF_NOREPORT))
1944                                 igmp6_send(&mcaddr->mca_addr, idev->dev,
1945                                            ICMPV6_MGM_REPORT);
1946                 }
1947                 read_unlock_bh(&idev->lock);
1948         } else {
1949                 mld_send_report(idev, NULL);
1950         }
1951 }
1952
1953 void ipv6_mc_dad_complete(struct inet6_dev *idev)
1954 {
1955         idev->mc_dad_count = idev->mc_qrv;
1956         if (idev->mc_dad_count) {
1957                 mld_resend_report(idev);
1958                 idev->mc_dad_count--;
1959                 if (idev->mc_dad_count)
1960                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1961         }
1962 }
1963
1964 static void mld_dad_timer_expire(unsigned long data)
1965 {
1966         struct inet6_dev *idev = (struct inet6_dev *)data;
1967
1968         mld_resend_report(idev);
1969         if (idev->mc_dad_count) {
1970                 idev->mc_dad_count--;
1971                 if (idev->mc_dad_count)
1972                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1973         }
1974         __in6_dev_put(idev);
1975 }
1976
1977 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1978         const struct in6_addr *psfsrc)
1979 {
1980         struct ip6_sf_list *psf, *psf_prev;
1981         int rv = 0;
1982
1983         psf_prev = NULL;
1984         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1985                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1986                         break;
1987                 psf_prev = psf;
1988         }
1989         if (!psf || psf->sf_count[sfmode] == 0) {
1990                 /* source filter not found, or count wrong =>  bug */
1991                 return -ESRCH;
1992         }
1993         psf->sf_count[sfmode]--;
1994         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1995                 struct inet6_dev *idev = pmc->idev;
1996
1997                 /* no more filters for this source */
1998                 if (psf_prev)
1999                         psf_prev->sf_next = psf->sf_next;
2000                 else
2001                         pmc->mca_sources = psf->sf_next;
2002                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2003                     !mld_in_v1_mode(idev)) {
2004                         psf->sf_crcount = idev->mc_qrv;
2005                         psf->sf_next = pmc->mca_tomb;
2006                         pmc->mca_tomb = psf;
2007                         rv = 1;
2008                 } else
2009                         kfree(psf);
2010         }
2011         return rv;
2012 }
2013
2014 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2015                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2016                           int delta)
2017 {
2018         struct ifmcaddr6 *pmc;
2019         int     changerec = 0;
2020         int     i, err;
2021
2022         if (!idev)
2023                 return -ENODEV;
2024         read_lock_bh(&idev->lock);
2025         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2026                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2027                         break;
2028         }
2029         if (!pmc) {
2030                 /* MCA not found?? bug */
2031                 read_unlock_bh(&idev->lock);
2032                 return -ESRCH;
2033         }
2034         spin_lock_bh(&pmc->mca_lock);
2035         sf_markstate(pmc);
2036         if (!delta) {
2037                 if (!pmc->mca_sfcount[sfmode]) {
2038                         spin_unlock_bh(&pmc->mca_lock);
2039                         read_unlock_bh(&idev->lock);
2040                         return -EINVAL;
2041                 }
2042                 pmc->mca_sfcount[sfmode]--;
2043         }
2044         err = 0;
2045         for (i=0; i<sfcount; i++) {
2046                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2047
2048                 changerec |= rv > 0;
2049                 if (!err && rv < 0)
2050                         err = rv;
2051         }
2052         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2053             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2054             pmc->mca_sfcount[MCAST_INCLUDE]) {
2055                 struct ip6_sf_list *psf;
2056
2057                 /* filter mode change */
2058                 pmc->mca_sfmode = MCAST_INCLUDE;
2059                 pmc->mca_crcount = idev->mc_qrv;
2060                 idev->mc_ifc_count = pmc->mca_crcount;
2061                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2062                         psf->sf_crcount = 0;
2063                 mld_ifc_event(pmc->idev);
2064         } else if (sf_setstate(pmc) || changerec)
2065                 mld_ifc_event(pmc->idev);
2066         spin_unlock_bh(&pmc->mca_lock);
2067         read_unlock_bh(&idev->lock);
2068         return err;
2069 }
2070
2071 /*
2072  * Add multicast single-source filter to the interface list
2073  */
2074 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2075         const struct in6_addr *psfsrc)
2076 {
2077         struct ip6_sf_list *psf, *psf_prev;
2078
2079         psf_prev = NULL;
2080         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2081                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2082                         break;
2083                 psf_prev = psf;
2084         }
2085         if (!psf) {
2086                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2087                 if (!psf)
2088                         return -ENOBUFS;
2089
2090                 psf->sf_addr = *psfsrc;
2091                 if (psf_prev) {
2092                         psf_prev->sf_next = psf;
2093                 } else
2094                         pmc->mca_sources = psf;
2095         }
2096         psf->sf_count[sfmode]++;
2097         return 0;
2098 }
2099
2100 static void sf_markstate(struct ifmcaddr6 *pmc)
2101 {
2102         struct ip6_sf_list *psf;
2103         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2104
2105         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2106                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2107                         psf->sf_oldin = mca_xcount ==
2108                                 psf->sf_count[MCAST_EXCLUDE] &&
2109                                 !psf->sf_count[MCAST_INCLUDE];
2110                 } else
2111                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2112 }
2113
2114 static int sf_setstate(struct ifmcaddr6 *pmc)
2115 {
2116         struct ip6_sf_list *psf, *dpsf;
2117         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2118         int qrv = pmc->idev->mc_qrv;
2119         int new_in, rv;
2120
2121         rv = 0;
2122         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2123                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2124                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2125                                 !psf->sf_count[MCAST_INCLUDE];
2126                 } else
2127                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2128                 if (new_in) {
2129                         if (!psf->sf_oldin) {
2130                                 struct ip6_sf_list *prev = NULL;
2131
2132                                 for (dpsf=pmc->mca_tomb; dpsf;
2133                                      dpsf=dpsf->sf_next) {
2134                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2135                                             &psf->sf_addr))
2136                                                 break;
2137                                         prev = dpsf;
2138                                 }
2139                                 if (dpsf) {
2140                                         if (prev)
2141                                                 prev->sf_next = dpsf->sf_next;
2142                                         else
2143                                                 pmc->mca_tomb = dpsf->sf_next;
2144                                         kfree(dpsf);
2145                                 }
2146                                 psf->sf_crcount = qrv;
2147                                 rv++;
2148                         }
2149                 } else if (psf->sf_oldin) {
2150                         psf->sf_crcount = 0;
2151                         /*
2152                          * add or update "delete" records if an active filter
2153                          * is now inactive
2154                          */
2155                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2156                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2157                                     &psf->sf_addr))
2158                                         break;
2159                         if (!dpsf) {
2160                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2161                                 if (!dpsf)
2162                                         continue;
2163                                 *dpsf = *psf;
2164                                 /* pmc->mca_lock held by callers */
2165                                 dpsf->sf_next = pmc->mca_tomb;
2166                                 pmc->mca_tomb = dpsf;
2167                         }
2168                         dpsf->sf_crcount = qrv;
2169                         rv++;
2170                 }
2171         }
2172         return rv;
2173 }
2174
2175 /*
2176  * Add multicast source filter list to the interface list
2177  */
2178 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2179                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2180                           int delta)
2181 {
2182         struct ifmcaddr6 *pmc;
2183         int     isexclude;
2184         int     i, err;
2185
2186         if (!idev)
2187                 return -ENODEV;
2188         read_lock_bh(&idev->lock);
2189         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2190                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2191                         break;
2192         }
2193         if (!pmc) {
2194                 /* MCA not found?? bug */
2195                 read_unlock_bh(&idev->lock);
2196                 return -ESRCH;
2197         }
2198         spin_lock_bh(&pmc->mca_lock);
2199
2200         sf_markstate(pmc);
2201         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2202         if (!delta)
2203                 pmc->mca_sfcount[sfmode]++;
2204         err = 0;
2205         for (i=0; i<sfcount; i++) {
2206                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2207                 if (err)
2208                         break;
2209         }
2210         if (err) {
2211                 int j;
2212
2213                 if (!delta)
2214                         pmc->mca_sfcount[sfmode]--;
2215                 for (j=0; j<i; j++)
2216                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2217         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2218                 struct ip6_sf_list *psf;
2219
2220                 /* filter mode change */
2221                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2222                         pmc->mca_sfmode = MCAST_EXCLUDE;
2223                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2224                         pmc->mca_sfmode = MCAST_INCLUDE;
2225                 /* else no filters; keep old mode for reports */
2226
2227                 pmc->mca_crcount = idev->mc_qrv;
2228                 idev->mc_ifc_count = pmc->mca_crcount;
2229                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2230                         psf->sf_crcount = 0;
2231                 mld_ifc_event(idev);
2232         } else if (sf_setstate(pmc))
2233                 mld_ifc_event(idev);
2234         spin_unlock_bh(&pmc->mca_lock);
2235         read_unlock_bh(&idev->lock);
2236         return err;
2237 }
2238
2239 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2240 {
2241         struct ip6_sf_list *psf, *nextpsf;
2242
2243         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2244                 nextpsf = psf->sf_next;
2245                 kfree(psf);
2246         }
2247         pmc->mca_tomb = NULL;
2248         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2249                 nextpsf = psf->sf_next;
2250                 kfree(psf);
2251         }
2252         pmc->mca_sources = NULL;
2253         pmc->mca_sfmode = MCAST_EXCLUDE;
2254         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2255         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2256 }
2257
2258
2259 static void igmp6_join_group(struct ifmcaddr6 *ma)
2260 {
2261         unsigned long delay;
2262
2263         if (ma->mca_flags & MAF_NOREPORT)
2264                 return;
2265
2266         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2267
2268         delay = net_random() % unsolicited_report_interval(ma->idev);
2269
2270         spin_lock_bh(&ma->mca_lock);
2271         if (del_timer(&ma->mca_timer)) {
2272                 atomic_dec(&ma->mca_refcnt);
2273                 delay = ma->mca_timer.expires - jiffies;
2274         }
2275
2276         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2277                 atomic_inc(&ma->mca_refcnt);
2278         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2279         spin_unlock_bh(&ma->mca_lock);
2280 }
2281
2282 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2283                             struct inet6_dev *idev)
2284 {
2285         int err;
2286
2287         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2288          * so no other readers or writers of iml or its sflist
2289          */
2290         if (!iml->sflist) {
2291                 /* any-source empty exclude case */
2292                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2293         }
2294         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2295                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2296         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2297         iml->sflist = NULL;
2298         return err;
2299 }
2300
2301 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2302 {
2303         if (mld_in_v1_mode(ma->idev)) {
2304                 if (ma->mca_flags & MAF_LAST_REPORTER)
2305                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2306                                 ICMPV6_MGM_REDUCTION);
2307         } else {
2308                 mld_add_delrec(ma->idev, ma);
2309                 mld_ifc_event(ma->idev);
2310         }
2311 }
2312
2313 static void mld_gq_timer_expire(unsigned long data)
2314 {
2315         struct inet6_dev *idev = (struct inet6_dev *)data;
2316
2317         idev->mc_gq_running = 0;
2318         mld_send_report(idev, NULL);
2319         __in6_dev_put(idev);
2320 }
2321
2322 static void mld_ifc_timer_expire(unsigned long data)
2323 {
2324         struct inet6_dev *idev = (struct inet6_dev *)data;
2325
2326         mld_send_cr(idev);
2327         if (idev->mc_ifc_count) {
2328                 idev->mc_ifc_count--;
2329                 if (idev->mc_ifc_count)
2330                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2331         }
2332         __in6_dev_put(idev);
2333 }
2334
2335 static void mld_ifc_event(struct inet6_dev *idev)
2336 {
2337         if (mld_in_v1_mode(idev))
2338                 return;
2339         idev->mc_ifc_count = idev->mc_qrv;
2340         mld_ifc_start_timer(idev, 1);
2341 }
2342
2343
2344 static void igmp6_timer_handler(unsigned long data)
2345 {
2346         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2347
2348         if (mld_in_v1_mode(ma->idev))
2349                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2350         else
2351                 mld_send_report(ma->idev, ma);
2352
2353         spin_lock(&ma->mca_lock);
2354         ma->mca_flags |=  MAF_LAST_REPORTER;
2355         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2356         spin_unlock(&ma->mca_lock);
2357         ma_put(ma);
2358 }
2359
2360 /* Device changing type */
2361
2362 void ipv6_mc_unmap(struct inet6_dev *idev)
2363 {
2364         struct ifmcaddr6 *i;
2365
2366         /* Install multicast list, except for all-nodes (already installed) */
2367
2368         read_lock_bh(&idev->lock);
2369         for (i = idev->mc_list; i; i = i->next)
2370                 igmp6_group_dropped(i);
2371         read_unlock_bh(&idev->lock);
2372 }
2373
2374 void ipv6_mc_remap(struct inet6_dev *idev)
2375 {
2376         ipv6_mc_up(idev);
2377 }
2378
2379 /* Device going down */
2380
2381 void ipv6_mc_down(struct inet6_dev *idev)
2382 {
2383         struct ifmcaddr6 *i;
2384
2385         /* Withdraw multicast list */
2386
2387         read_lock_bh(&idev->lock);
2388         idev->mc_ifc_count = 0;
2389         if (del_timer(&idev->mc_ifc_timer))
2390                 __in6_dev_put(idev);
2391         idev->mc_gq_running = 0;
2392         if (del_timer(&idev->mc_gq_timer))
2393                 __in6_dev_put(idev);
2394         if (del_timer(&idev->mc_dad_timer))
2395                 __in6_dev_put(idev);
2396
2397         for (i = idev->mc_list; i; i=i->next)
2398                 igmp6_group_dropped(i);
2399         read_unlock_bh(&idev->lock);
2400
2401         mld_clear_delrec(idev);
2402 }
2403
2404
2405 /* Device going up */
2406
2407 void ipv6_mc_up(struct inet6_dev *idev)
2408 {
2409         struct ifmcaddr6 *i;
2410
2411         /* Install multicast list, except for all-nodes (already installed) */
2412
2413         read_lock_bh(&idev->lock);
2414         for (i = idev->mc_list; i; i=i->next)
2415                 igmp6_group_added(i);
2416         read_unlock_bh(&idev->lock);
2417 }
2418
2419 /* IPv6 device initialization. */
2420
2421 void ipv6_mc_init_dev(struct inet6_dev *idev)
2422 {
2423         write_lock_bh(&idev->lock);
2424         spin_lock_init(&idev->mc_lock);
2425         idev->mc_gq_running = 0;
2426         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2427                         (unsigned long)idev);
2428         idev->mc_tomb = NULL;
2429         idev->mc_ifc_count = 0;
2430         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2431                         (unsigned long)idev);
2432         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2433                     (unsigned long)idev);
2434
2435         idev->mc_qrv = MLD_QRV_DEFAULT;
2436         idev->mc_qi = MLD_QI_DEFAULT;
2437         idev->mc_qri = MLD_QRI_DEFAULT;
2438
2439         idev->mc_maxdelay = unsolicited_report_interval(idev);
2440         idev->mc_v1_seen = 0;
2441         write_unlock_bh(&idev->lock);
2442 }
2443
2444 /*
2445  *      Device is about to be destroyed: clean up.
2446  */
2447
2448 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2449 {
2450         struct ifmcaddr6 *i;
2451
2452         /* Deactivate timers */
2453         ipv6_mc_down(idev);
2454
2455         /* Delete all-nodes address. */
2456         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2457          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2458          * fail.
2459          */
2460         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2461
2462         if (idev->cnf.forwarding)
2463                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2464
2465         write_lock_bh(&idev->lock);
2466         while ((i = idev->mc_list) != NULL) {
2467                 idev->mc_list = i->next;
2468                 write_unlock_bh(&idev->lock);
2469
2470                 igmp6_group_dropped(i);
2471                 ma_put(i);
2472
2473                 write_lock_bh(&idev->lock);
2474         }
2475         write_unlock_bh(&idev->lock);
2476 }
2477
2478 #ifdef CONFIG_PROC_FS
2479 struct igmp6_mc_iter_state {
2480         struct seq_net_private p;
2481         struct net_device *dev;
2482         struct inet6_dev *idev;
2483 };
2484
2485 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2486
2487 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2488 {
2489         struct ifmcaddr6 *im = NULL;
2490         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2491         struct net *net = seq_file_net(seq);
2492
2493         state->idev = NULL;
2494         for_each_netdev_rcu(net, state->dev) {
2495                 struct inet6_dev *idev;
2496                 idev = __in6_dev_get(state->dev);
2497                 if (!idev)
2498                         continue;
2499                 read_lock_bh(&idev->lock);
2500                 im = idev->mc_list;
2501                 if (im) {
2502                         state->idev = idev;
2503                         break;
2504                 }
2505                 read_unlock_bh(&idev->lock);
2506         }
2507         return im;
2508 }
2509
2510 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2511 {
2512         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2513
2514         im = im->next;
2515         while (!im) {
2516                 if (likely(state->idev != NULL))
2517                         read_unlock_bh(&state->idev->lock);
2518
2519                 state->dev = next_net_device_rcu(state->dev);
2520                 if (!state->dev) {
2521                         state->idev = NULL;
2522                         break;
2523                 }
2524                 state->idev = __in6_dev_get(state->dev);
2525                 if (!state->idev)
2526                         continue;
2527                 read_lock_bh(&state->idev->lock);
2528                 im = state->idev->mc_list;
2529         }
2530         return im;
2531 }
2532
2533 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2534 {
2535         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2536         if (im)
2537                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2538                         --pos;
2539         return pos ? NULL : im;
2540 }
2541
2542 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2543         __acquires(RCU)
2544 {
2545         rcu_read_lock();
2546         return igmp6_mc_get_idx(seq, *pos);
2547 }
2548
2549 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2550 {
2551         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2552
2553         ++*pos;
2554         return im;
2555 }
2556
2557 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2558         __releases(RCU)
2559 {
2560         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2561
2562         if (likely(state->idev != NULL)) {
2563                 read_unlock_bh(&state->idev->lock);
2564                 state->idev = NULL;
2565         }
2566         state->dev = NULL;
2567         rcu_read_unlock();
2568 }
2569
2570 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2571 {
2572         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2573         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2574
2575         seq_printf(seq,
2576                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2577                    state->dev->ifindex, state->dev->name,
2578                    &im->mca_addr,
2579                    im->mca_users, im->mca_flags,
2580                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2581                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2582         return 0;
2583 }
2584
2585 static const struct seq_operations igmp6_mc_seq_ops = {
2586         .start  =       igmp6_mc_seq_start,
2587         .next   =       igmp6_mc_seq_next,
2588         .stop   =       igmp6_mc_seq_stop,
2589         .show   =       igmp6_mc_seq_show,
2590 };
2591
2592 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2593 {
2594         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2595                             sizeof(struct igmp6_mc_iter_state));
2596 }
2597
2598 static const struct file_operations igmp6_mc_seq_fops = {
2599         .owner          =       THIS_MODULE,
2600         .open           =       igmp6_mc_seq_open,
2601         .read           =       seq_read,
2602         .llseek         =       seq_lseek,
2603         .release        =       seq_release_net,
2604 };
2605
2606 struct igmp6_mcf_iter_state {
2607         struct seq_net_private p;
2608         struct net_device *dev;
2609         struct inet6_dev *idev;
2610         struct ifmcaddr6 *im;
2611 };
2612
2613 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2614
2615 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2616 {
2617         struct ip6_sf_list *psf = NULL;
2618         struct ifmcaddr6 *im = NULL;
2619         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2620         struct net *net = seq_file_net(seq);
2621
2622         state->idev = NULL;
2623         state->im = NULL;
2624         for_each_netdev_rcu(net, state->dev) {
2625                 struct inet6_dev *idev;
2626                 idev = __in6_dev_get(state->dev);
2627                 if (unlikely(idev == NULL))
2628                         continue;
2629                 read_lock_bh(&idev->lock);
2630                 im = idev->mc_list;
2631                 if (likely(im != NULL)) {
2632                         spin_lock_bh(&im->mca_lock);
2633                         psf = im->mca_sources;
2634                         if (likely(psf != NULL)) {
2635                                 state->im = im;
2636                                 state->idev = idev;
2637                                 break;
2638                         }
2639                         spin_unlock_bh(&im->mca_lock);
2640                 }
2641                 read_unlock_bh(&idev->lock);
2642         }
2643         return psf;
2644 }
2645
2646 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2647 {
2648         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2649
2650         psf = psf->sf_next;
2651         while (!psf) {
2652                 spin_unlock_bh(&state->im->mca_lock);
2653                 state->im = state->im->next;
2654                 while (!state->im) {
2655                         if (likely(state->idev != NULL))
2656                                 read_unlock_bh(&state->idev->lock);
2657
2658                         state->dev = next_net_device_rcu(state->dev);
2659                         if (!state->dev) {
2660                                 state->idev = NULL;
2661                                 goto out;
2662                         }
2663                         state->idev = __in6_dev_get(state->dev);
2664                         if (!state->idev)
2665                                 continue;
2666                         read_lock_bh(&state->idev->lock);
2667                         state->im = state->idev->mc_list;
2668                 }
2669                 if (!state->im)
2670                         break;
2671                 spin_lock_bh(&state->im->mca_lock);
2672                 psf = state->im->mca_sources;
2673         }
2674 out:
2675         return psf;
2676 }
2677
2678 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2679 {
2680         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2681         if (psf)
2682                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2683                         --pos;
2684         return pos ? NULL : psf;
2685 }
2686
2687 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2688         __acquires(RCU)
2689 {
2690         rcu_read_lock();
2691         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2692 }
2693
2694 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2695 {
2696         struct ip6_sf_list *psf;
2697         if (v == SEQ_START_TOKEN)
2698                 psf = igmp6_mcf_get_first(seq);
2699         else
2700                 psf = igmp6_mcf_get_next(seq, v);
2701         ++*pos;
2702         return psf;
2703 }
2704
2705 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2706         __releases(RCU)
2707 {
2708         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2709         if (likely(state->im != NULL)) {
2710                 spin_unlock_bh(&state->im->mca_lock);
2711                 state->im = NULL;
2712         }
2713         if (likely(state->idev != NULL)) {
2714                 read_unlock_bh(&state->idev->lock);
2715                 state->idev = NULL;
2716         }
2717         state->dev = NULL;
2718         rcu_read_unlock();
2719 }
2720
2721 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2722 {
2723         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2724         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2725
2726         if (v == SEQ_START_TOKEN) {
2727                 seq_printf(seq,
2728                            "%3s %6s "
2729                            "%32s %32s %6s %6s\n", "Idx",
2730                            "Device", "Multicast Address",
2731                            "Source Address", "INC", "EXC");
2732         } else {
2733                 seq_printf(seq,
2734                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2735                            state->dev->ifindex, state->dev->name,
2736                            &state->im->mca_addr,
2737                            &psf->sf_addr,
2738                            psf->sf_count[MCAST_INCLUDE],
2739                            psf->sf_count[MCAST_EXCLUDE]);
2740         }
2741         return 0;
2742 }
2743
2744 static const struct seq_operations igmp6_mcf_seq_ops = {
2745         .start  =       igmp6_mcf_seq_start,
2746         .next   =       igmp6_mcf_seq_next,
2747         .stop   =       igmp6_mcf_seq_stop,
2748         .show   =       igmp6_mcf_seq_show,
2749 };
2750
2751 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2752 {
2753         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2754                             sizeof(struct igmp6_mcf_iter_state));
2755 }
2756
2757 static const struct file_operations igmp6_mcf_seq_fops = {
2758         .owner          =       THIS_MODULE,
2759         .open           =       igmp6_mcf_seq_open,
2760         .read           =       seq_read,
2761         .llseek         =       seq_lseek,
2762         .release        =       seq_release_net,
2763 };
2764
2765 static int __net_init igmp6_proc_init(struct net *net)
2766 {
2767         int err;
2768
2769         err = -ENOMEM;
2770         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2771                 goto out;
2772         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2773                          &igmp6_mcf_seq_fops))
2774                 goto out_proc_net_igmp6;
2775
2776         err = 0;
2777 out:
2778         return err;
2779
2780 out_proc_net_igmp6:
2781         remove_proc_entry("igmp6", net->proc_net);
2782         goto out;
2783 }
2784
2785 static void __net_exit igmp6_proc_exit(struct net *net)
2786 {
2787         remove_proc_entry("mcfilter6", net->proc_net);
2788         remove_proc_entry("igmp6", net->proc_net);
2789 }
2790 #else
2791 static inline int igmp6_proc_init(struct net *net)
2792 {
2793         return 0;
2794 }
2795 static inline void igmp6_proc_exit(struct net *net)
2796 {
2797 }
2798 #endif
2799
2800 static int __net_init igmp6_net_init(struct net *net)
2801 {
2802         int err;
2803
2804         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2805                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2806         if (err < 0) {
2807                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2808                        err);
2809                 goto out;
2810         }
2811
2812         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2813
2814         err = igmp6_proc_init(net);
2815         if (err)
2816                 goto out_sock_create;
2817 out:
2818         return err;
2819
2820 out_sock_create:
2821         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2822         goto out;
2823 }
2824
2825 static void __net_exit igmp6_net_exit(struct net *net)
2826 {
2827         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2828         igmp6_proc_exit(net);
2829 }
2830
2831 static struct pernet_operations igmp6_net_ops = {
2832         .init = igmp6_net_init,
2833         .exit = igmp6_net_exit,
2834 };
2835
2836 int __init igmp6_init(void)
2837 {
2838         return register_pernet_subsys(&igmp6_net_ops);
2839 }
2840
2841 void igmp6_cleanup(void)
2842 {
2843         unregister_pernet_subsys(&igmp6_net_ops);
2844 }