net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <linux/pkt_sched.h>
  48 #include <net/mld.h>
  49
  50 #include <linux/netfilter.h>
  51 #include <linux/netfilter_ipv6.h>
  52
  53 #include <net/net_namespace.h>
  54 #include <net/sock.h>
  55 #include <net/snmp.h>
  56
  57 #include <net/ipv6.h>
  58 #include <net/protocol.h>
  59 #include <net/if_inet6.h>
  60 #include <net/ndisc.h>
  61 #include <net/addrconf.h>
  62 #include <net/ip6_route.h>
  63 #include <net/inet_common.h>
  64
  65 #include <net/ip6_checksum.h>
  66
  67 /* Set to 3 to get tracing... */
  68 #define MCAST_DEBUG 2
  69
  70 #if MCAST_DEBUG >= 3
  71 #define MDBG(x) printk x
  72 #else
  73 #define MDBG(x)
  74 #endif
  75
  76 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  77 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  80         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  81 };
  82
  83 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  84
  85 /* Big mc list lock for all the sockets */
  86 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  87
  88 static void igmp6_join_group(struct ifmcaddr6 *ma);
  89 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  90 static void igmp6_timer_handler(unsigned long data);
  91
  92 static void mld_gq_timer_expire(unsigned long data);
  93 static void mld_ifc_timer_expire(unsigned long data);
  94 static void mld_ifc_event(struct inet6_dev *idev);
  95 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  96 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  97 static void mld_clear_delrec(struct inet6_dev *idev);
  98 static int sf_setstate(struct ifmcaddr6 *pmc);
  99 static void sf_markstate(struct ifmcaddr6 *pmc);
 100 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 101 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 102                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 103                           int delta);
 104 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 105                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 106                           int delta);
 107 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 108                             struct inet6_dev *idev);
 109
 110 #define MLD_QRV_DEFAULT         2
 111
 112 /* RFC3810, 8.1 Query Version Distinctions */
 113 #define MLD_V1_QUERY_LEN        24
 114 #define MLD_V2_QUERY_LEN_MIN    28
 115
 116 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 117                 (idev)->cnf.force_mld_version == 1 || \
 118                 ((idev)->mc_v1_seen && \
 119                 time_before(jiffies, (idev)->mc_v1_seen)))
 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_V1_SEEN(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_V1_SEEN(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 /* called with rcu_read_lock() */
1116 int igmp6_event_query(struct sk_buff *skb)
1117 {
1118         struct mld2_query *mlh2 = NULL;
1119         struct ifmcaddr6 *ma;
1120         const struct in6_addr *group;
1121         unsigned long max_delay;
1122         struct inet6_dev *idev;
1123         struct mld_msg *mld;
1124         int group_type;
1125         int mark = 0;
1126         int len;
1127
1128         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1129                 return -EINVAL;
1130
1131         /* compute payload length excluding extension headers */
1132         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1133         len -= skb_network_header_len(skb);
1134
1135         /* Drop queries with not link local source */
1136         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1137                 return -EINVAL;
1138
1139         idev = __in6_dev_get(skb->dev);
1140
1141         if (idev == NULL)
1142                 return 0;
1143
1144         mld = (struct mld_msg *)icmp6_hdr(skb);
1145         group = &mld->mld_mca;
1146         group_type = ipv6_addr_type(group);
1147
1148         if (group_type != IPV6_ADDR_ANY &&
1149             !(group_type&IPV6_ADDR_MULTICAST))
1150                 return -EINVAL;
1151
1152         if (len == MLD_V1_QUERY_LEN) {
1153                 int switchback;
1154                 /* MLDv1 router present */
1155
1156                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1157                 switchback = (idev->mc_qrv + 1) * max_delay;
1158                 idev->mc_v1_seen = jiffies + switchback;
1159
1160                 /* cancel the interface change timer */
1161                 idev->mc_ifc_count = 0;
1162                 if (del_timer(&idev->mc_ifc_timer))
1163                         __in6_dev_put(idev);
1164                 /* clear deleted report items */
1165                 mld_clear_delrec(idev);
1166         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1167                 int srcs_offset = sizeof(struct mld2_query) -
1168                                   sizeof(struct icmp6hdr);
1169                 if (!pskb_may_pull(skb, srcs_offset))
1170                         return -EINVAL;
1171
1172                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1173
1174                 max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mlh2->mld2q_mrc))), 1UL);
1175
1176                 idev->mc_maxdelay = max_delay;
1177
1178                 if (mlh2->mld2q_qrv)
1179                         idev->mc_qrv = mlh2->mld2q_qrv;
1180                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1181                         if (mlh2->mld2q_nsrcs)
1182                                 return -EINVAL; /* no sources allowed */
1183
1184                         mld_gq_start_timer(idev);
1185                         return 0;
1186                 }
1187                 /* mark sources to include, if group & source-specific */
1188                 if (mlh2->mld2q_nsrcs != 0) {
1189                         if (!pskb_may_pull(skb, srcs_offset +
1190                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1191                                 return -EINVAL;
1192
1193                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1194                         mark = 1;
1195                 }
1196         } else
1197                 return -EINVAL;
1198
1199         read_lock_bh(&idev->lock);
1200         if (group_type == IPV6_ADDR_ANY) {
1201                 for (ma = idev->mc_list; ma; ma=ma->next) {
1202                         spin_lock_bh(&ma->mca_lock);
1203                         igmp6_group_queried(ma, max_delay);
1204                         spin_unlock_bh(&ma->mca_lock);
1205                 }
1206         } else {
1207                 for (ma = idev->mc_list; ma; ma=ma->next) {
1208                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1209                                 continue;
1210                         spin_lock_bh(&ma->mca_lock);
1211                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1212                                 /* gsquery <- gsquery && mark */
1213                                 if (!mark)
1214                                         ma->mca_flags &= ~MAF_GSQUERY;
1215                         } else {
1216                                 /* gsquery <- mark */
1217                                 if (mark)
1218                                         ma->mca_flags |= MAF_GSQUERY;
1219                                 else
1220                                         ma->mca_flags &= ~MAF_GSQUERY;
1221                         }
1222                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1223                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1224                                 igmp6_group_queried(ma, max_delay);
1225                         spin_unlock_bh(&ma->mca_lock);
1226                         break;
1227                 }
1228         }
1229         read_unlock_bh(&idev->lock);
1230
1231         return 0;
1232 }
1233
1234 /* called with rcu_read_lock() */
1235 int igmp6_event_report(struct sk_buff *skb)
1236 {
1237         struct ifmcaddr6 *ma;
1238         struct inet6_dev *idev;
1239         struct mld_msg *mld;
1240         int addr_type;
1241
1242         /* Our own report looped back. Ignore it. */
1243         if (skb->pkt_type == PACKET_LOOPBACK)
1244                 return 0;
1245
1246         /* send our report if the MC router may not have heard this report */
1247         if (skb->pkt_type != PACKET_MULTICAST &&
1248             skb->pkt_type != PACKET_BROADCAST)
1249                 return 0;
1250
1251         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1252                 return -EINVAL;
1253
1254         mld = (struct mld_msg *)icmp6_hdr(skb);
1255
1256         /* Drop reports with not link local source */
1257         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1258         if (addr_type != IPV6_ADDR_ANY &&
1259             !(addr_type&IPV6_ADDR_LINKLOCAL))
1260                 return -EINVAL;
1261
1262         idev = __in6_dev_get(skb->dev);
1263         if (idev == NULL)
1264                 return -ENODEV;
1265
1266         /*
1267          *      Cancel the timer for this group
1268          */
1269
1270         read_lock_bh(&idev->lock);
1271         for (ma = idev->mc_list; ma; ma=ma->next) {
1272                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1273                         spin_lock(&ma->mca_lock);
1274                         if (del_timer(&ma->mca_timer))
1275                                 atomic_dec(&ma->mca_refcnt);
1276                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1277                         spin_unlock(&ma->mca_lock);
1278                         break;
1279                 }
1280         }
1281         read_unlock_bh(&idev->lock);
1282         return 0;
1283 }
1284
1285 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1286                   int gdeleted, int sdeleted)
1287 {
1288         switch (type) {
1289         case MLD2_MODE_IS_INCLUDE:
1290         case MLD2_MODE_IS_EXCLUDE:
1291                 if (gdeleted || sdeleted)
1292                         return false;
1293                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1294                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1295                                 return true;
1296                         /* don't include if this source is excluded
1297                          * in all filters
1298                          */
1299                         if (psf->sf_count[MCAST_INCLUDE])
1300                                 return type == MLD2_MODE_IS_INCLUDE;
1301                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1302                                 psf->sf_count[MCAST_EXCLUDE];
1303                 }
1304                 return false;
1305         case MLD2_CHANGE_TO_INCLUDE:
1306                 if (gdeleted || sdeleted)
1307                         return false;
1308                 return psf->sf_count[MCAST_INCLUDE] != 0;
1309         case MLD2_CHANGE_TO_EXCLUDE:
1310                 if (gdeleted || sdeleted)
1311                         return false;
1312                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1313                     psf->sf_count[MCAST_INCLUDE])
1314                         return false;
1315                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1316                         psf->sf_count[MCAST_EXCLUDE];
1317         case MLD2_ALLOW_NEW_SOURCES:
1318                 if (gdeleted || !psf->sf_crcount)
1319                         return false;
1320                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1321         case MLD2_BLOCK_OLD_SOURCES:
1322                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1323                         return gdeleted || (psf->sf_crcount && sdeleted);
1324                 return psf->sf_crcount && !gdeleted && !sdeleted;
1325         }
1326         return false;
1327 }
1328
1329 static int
1330 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1331 {
1332         struct ip6_sf_list *psf;
1333         int scount = 0;
1334
1335         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1336                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1337                         continue;
1338                 scount++;
1339         }
1340         return scount;
1341 }
1342
1343 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1344                        struct net_device *dev,
1345                        const struct in6_addr *saddr,
1346                        const struct in6_addr *daddr,
1347                        int proto, int len)
1348 {
1349         struct ipv6hdr *hdr;
1350
1351         skb->protocol = htons(ETH_P_IPV6);
1352         skb->dev = dev;
1353
1354         skb_reset_network_header(skb);
1355         skb_put(skb, sizeof(struct ipv6hdr));
1356         hdr = ipv6_hdr(skb);
1357
1358         ip6_flow_hdr(hdr, 0, 0);
1359
1360         hdr->payload_len = htons(len);
1361         hdr->nexthdr = proto;
1362         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1363
1364         hdr->saddr = *saddr;
1365         hdr->daddr = *daddr;
1366 }
1367
1368 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1369 {
1370         struct net_device *dev = idev->dev;
1371         struct net *net = dev_net(dev);
1372         struct sock *sk = net->ipv6.igmp_sk;
1373         struct sk_buff *skb;
1374         struct mld2_report *pmr;
1375         struct in6_addr addr_buf;
1376         const struct in6_addr *saddr;
1377         int hlen = LL_RESERVED_SPACE(dev);
1378         int tlen = dev->needed_tailroom;
1379         int err;
1380         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1381                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1382                      IPV6_TLV_PADN, 0 };
1383
1384         /* we assume size > sizeof(ra) here */
1385         size += hlen + tlen;
1386         /* limit our allocations to order-0 page */
1387         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1388         skb = sock_alloc_send_skb(sk, size, 1, &err);
1389
1390         if (!skb)
1391                 return NULL;
1392
1393         skb->priority = TC_PRIO_CONTROL;
1394         skb_reserve(skb, hlen);
1395
1396         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1397                 /* <draft-ietf-magma-mld-source-05.txt>:
1398                  * use unspecified address as the source address
1399                  * when a valid link-local address is not available.
1400                  */
1401                 saddr = &in6addr_any;
1402         } else
1403                 saddr = &addr_buf;
1404
1405         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1406
1407         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1408
1409         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1410         skb_put(skb, sizeof(*pmr));
1411         pmr = (struct mld2_report *)skb_transport_header(skb);
1412         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1413         pmr->mld2r_resv1 = 0;
1414         pmr->mld2r_cksum = 0;
1415         pmr->mld2r_resv2 = 0;
1416         pmr->mld2r_ngrec = 0;
1417         return skb;
1418 }
1419
1420 static void mld_sendpack(struct sk_buff *skb)
1421 {
1422         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1423         struct mld2_report *pmr =
1424                               (struct mld2_report *)skb_transport_header(skb);
1425         int payload_len, mldlen;
1426         struct inet6_dev *idev;
1427         struct net *net = dev_net(skb->dev);
1428         int err;
1429         struct flowi6 fl6;
1430         struct dst_entry *dst;
1431
1432         rcu_read_lock();
1433         idev = __in6_dev_get(skb->dev);
1434         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1435
1436         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1437                 sizeof(*pip6);
1438         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1439         pip6->payload_len = htons(payload_len);
1440
1441         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1442                                            IPPROTO_ICMPV6,
1443                                            csum_partial(skb_transport_header(skb),
1444                                                         mldlen, 0));
1445
1446         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1447                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1448                          skb->dev->ifindex);
1449         dst = icmp6_dst_alloc(skb->dev, &fl6);
1450
1451         err = 0;
1452         if (IS_ERR(dst)) {
1453                 err = PTR_ERR(dst);
1454                 dst = NULL;
1455         }
1456         skb_dst_set(skb, dst);
1457         if (err)
1458                 goto err_out;
1459
1460         payload_len = skb->len;
1461
1462         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1463                       dst_output);
1464 out:
1465         if (!err) {
1466                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1467                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1468                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1469         } else
1470                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1471
1472         rcu_read_unlock();
1473         return;
1474
1475 err_out:
1476         kfree_skb(skb);
1477         goto out;
1478 }
1479
1480 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1481 {
1482         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1483 }
1484
1485 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1486         int type, struct mld2_grec **ppgr)
1487 {
1488         struct net_device *dev = pmc->idev->dev;
1489         struct mld2_report *pmr;
1490         struct mld2_grec *pgr;
1491
1492         if (!skb)
1493                 skb = mld_newpack(pmc->idev, dev->mtu);
1494         if (!skb)
1495                 return NULL;
1496         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1497         pgr->grec_type = type;
1498         pgr->grec_auxwords = 0;
1499         pgr->grec_nsrcs = 0;
1500         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1501         pmr = (struct mld2_report *)skb_transport_header(skb);
1502         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1503         *ppgr = pgr;
1504         return skb;
1505 }
1506
1507 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1508         skb_tailroom(skb)) : 0)
1509
1510 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1511         int type, int gdeleted, int sdeleted)
1512 {
1513         struct inet6_dev *idev = pmc->idev;
1514         struct net_device *dev = idev->dev;
1515         struct mld2_report *pmr;
1516         struct mld2_grec *pgr = NULL;
1517         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1518         int scount, stotal, first, isquery, truncate;
1519
1520         if (pmc->mca_flags & MAF_NOREPORT)
1521                 return skb;
1522
1523         isquery = type == MLD2_MODE_IS_INCLUDE ||
1524                   type == MLD2_MODE_IS_EXCLUDE;
1525         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1526                     type == MLD2_CHANGE_TO_EXCLUDE;
1527
1528         stotal = scount = 0;
1529
1530         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1531
1532         if (!*psf_list)
1533                 goto empty_source;
1534
1535         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1536
1537         /* EX and TO_EX get a fresh packet, if needed */
1538         if (truncate) {
1539                 if (pmr && pmr->mld2r_ngrec &&
1540                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1541                         if (skb)
1542                                 mld_sendpack(skb);
1543                         skb = mld_newpack(idev, dev->mtu);
1544                 }
1545         }
1546         first = 1;
1547         psf_prev = NULL;
1548         for (psf=*psf_list; psf; psf=psf_next) {
1549                 struct in6_addr *psrc;
1550
1551                 psf_next = psf->sf_next;
1552
1553                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1554                         psf_prev = psf;
1555                         continue;
1556                 }
1557
1558                 /* clear marks on query responses */
1559                 if (isquery)
1560                         psf->sf_gsresp = 0;
1561
1562                 if (AVAILABLE(skb) < sizeof(*psrc) +
1563                     first*sizeof(struct mld2_grec)) {
1564                         if (truncate && !first)
1565                                 break;   /* truncate these */
1566                         if (pgr)
1567                                 pgr->grec_nsrcs = htons(scount);
1568                         if (skb)
1569                                 mld_sendpack(skb);
1570                         skb = mld_newpack(idev, dev->mtu);
1571                         first = 1;
1572                         scount = 0;
1573                 }
1574                 if (first) {
1575                         skb = add_grhead(skb, pmc, type, &pgr);
1576                         first = 0;
1577                 }
1578                 if (!skb)
1579                         return NULL;
1580                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1581                 *psrc = psf->sf_addr;
1582                 scount++; stotal++;
1583                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1584                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1585                         psf->sf_crcount--;
1586                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1587                                 if (psf_prev)
1588                                         psf_prev->sf_next = psf->sf_next;
1589                                 else
1590                                         *psf_list = psf->sf_next;
1591                                 kfree(psf);
1592                                 continue;
1593                         }
1594                 }
1595                 psf_prev = psf;
1596         }
1597
1598 empty_source:
1599         if (!stotal) {
1600                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1601                     type == MLD2_BLOCK_OLD_SOURCES)
1602                         return skb;
1603                 if (pmc->mca_crcount || isquery) {
1604                         /* make sure we have room for group header */
1605                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1606                                 mld_sendpack(skb);
1607                                 skb = NULL; /* add_grhead will get a new one */
1608                         }
1609                         skb = add_grhead(skb, pmc, type, &pgr);
1610                 }
1611         }
1612         if (pgr)
1613                 pgr->grec_nsrcs = htons(scount);
1614
1615         if (isquery)
1616                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1617         return skb;
1618 }
1619
1620 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1621 {
1622         struct sk_buff *skb = NULL;
1623         int type;
1624
1625         read_lock_bh(&idev->lock);
1626         if (!pmc) {
1627                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1628                         if (pmc->mca_flags & MAF_NOREPORT)
1629                                 continue;
1630                         spin_lock_bh(&pmc->mca_lock);
1631                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1632                                 type = MLD2_MODE_IS_EXCLUDE;
1633                         else
1634                                 type = MLD2_MODE_IS_INCLUDE;
1635                         skb = add_grec(skb, pmc, type, 0, 0);
1636                         spin_unlock_bh(&pmc->mca_lock);
1637                 }
1638         } else {
1639                 spin_lock_bh(&pmc->mca_lock);
1640                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1641                         type = MLD2_MODE_IS_EXCLUDE;
1642                 else
1643                         type = MLD2_MODE_IS_INCLUDE;
1644                 skb = add_grec(skb, pmc, type, 0, 0);
1645                 spin_unlock_bh(&pmc->mca_lock);
1646         }
1647         read_unlock_bh(&idev->lock);
1648         if (skb)
1649                 mld_sendpack(skb);
1650 }
1651
1652 /*
1653  * remove zero-count source records from a source filter list
1654  */
1655 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1656 {
1657         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1658
1659         psf_prev = NULL;
1660         for (psf=*ppsf; psf; psf = psf_next) {
1661                 psf_next = psf->sf_next;
1662                 if (psf->sf_crcount == 0) {
1663                         if (psf_prev)
1664                                 psf_prev->sf_next = psf->sf_next;
1665                         else
1666                                 *ppsf = psf->sf_next;
1667                         kfree(psf);
1668                 } else
1669                         psf_prev = psf;
1670         }
1671 }
1672
1673 static void mld_send_cr(struct inet6_dev *idev)
1674 {
1675         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1676         struct sk_buff *skb = NULL;
1677         int type, dtype;
1678
1679         read_lock_bh(&idev->lock);
1680         spin_lock(&idev->mc_lock);
1681
1682         /* deleted MCA's */
1683         pmc_prev = NULL;
1684         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1685                 pmc_next = pmc->next;
1686                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1687                         type = MLD2_BLOCK_OLD_SOURCES;
1688                         dtype = MLD2_BLOCK_OLD_SOURCES;
1689                         skb = add_grec(skb, pmc, type, 1, 0);
1690                         skb = add_grec(skb, pmc, dtype, 1, 1);
1691                 }
1692                 if (pmc->mca_crcount) {
1693                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1694                                 type = MLD2_CHANGE_TO_INCLUDE;
1695                                 skb = add_grec(skb, pmc, type, 1, 0);
1696                         }
1697                         pmc->mca_crcount--;
1698                         if (pmc->mca_crcount == 0) {
1699                                 mld_clear_zeros(&pmc->mca_tomb);
1700                                 mld_clear_zeros(&pmc->mca_sources);
1701                         }
1702                 }
1703                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1704                     !pmc->mca_sources) {
1705                         if (pmc_prev)
1706                                 pmc_prev->next = pmc_next;
1707                         else
1708                                 idev->mc_tomb = pmc_next;
1709                         in6_dev_put(pmc->idev);
1710                         kfree(pmc);
1711                 } else
1712                         pmc_prev = pmc;
1713         }
1714         spin_unlock(&idev->mc_lock);
1715
1716         /* change recs */
1717         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1718                 spin_lock_bh(&pmc->mca_lock);
1719                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1720                         type = MLD2_BLOCK_OLD_SOURCES;
1721                         dtype = MLD2_ALLOW_NEW_SOURCES;
1722                 } else {
1723                         type = MLD2_ALLOW_NEW_SOURCES;
1724                         dtype = MLD2_BLOCK_OLD_SOURCES;
1725                 }
1726                 skb = add_grec(skb, pmc, type, 0, 0);
1727                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1728
1729                 /* filter mode changes */
1730                 if (pmc->mca_crcount) {
1731                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1732                                 type = MLD2_CHANGE_TO_EXCLUDE;
1733                         else
1734                                 type = MLD2_CHANGE_TO_INCLUDE;
1735                         skb = add_grec(skb, pmc, type, 0, 0);
1736                         pmc->mca_crcount--;
1737                 }
1738                 spin_unlock_bh(&pmc->mca_lock);
1739         }
1740         read_unlock_bh(&idev->lock);
1741         if (!skb)
1742                 return;
1743         (void) mld_sendpack(skb);
1744 }
1745
1746 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1747 {
1748         struct net *net = dev_net(dev);
1749         struct sock *sk = net->ipv6.igmp_sk;
1750         struct inet6_dev *idev;
1751         struct sk_buff *skb;
1752         struct mld_msg *hdr;
1753         const struct in6_addr *snd_addr, *saddr;
1754         struct in6_addr addr_buf;
1755         int hlen = LL_RESERVED_SPACE(dev);
1756         int tlen = dev->needed_tailroom;
1757         int err, len, payload_len, full_len;
1758         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1759                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1760                      IPV6_TLV_PADN, 0 };
1761         struct flowi6 fl6;
1762         struct dst_entry *dst;
1763
1764         if (type == ICMPV6_MGM_REDUCTION)
1765                 snd_addr = &in6addr_linklocal_allrouters;
1766         else
1767                 snd_addr = addr;
1768
1769         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1770         payload_len = len + sizeof(ra);
1771         full_len = sizeof(struct ipv6hdr) + payload_len;
1772
1773         rcu_read_lock();
1774         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1775                       IPSTATS_MIB_OUT, full_len);
1776         rcu_read_unlock();
1777
1778         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1779
1780         if (skb == NULL) {
1781                 rcu_read_lock();
1782                 IP6_INC_STATS(net, __in6_dev_get(dev),
1783                               IPSTATS_MIB_OUTDISCARDS);
1784                 rcu_read_unlock();
1785                 return;
1786         }
1787         skb->priority = TC_PRIO_CONTROL;
1788         skb_reserve(skb, hlen);
1789
1790         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1791                 /* <draft-ietf-magma-mld-source-05.txt>:
1792                  * use unspecified address as the source address
1793                  * when a valid link-local address is not available.
1794                  */
1795                 saddr = &in6addr_any;
1796         } else
1797                 saddr = &addr_buf;
1798
1799         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1800
1801         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1802
1803         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1804         memset(hdr, 0, sizeof(struct mld_msg));
1805         hdr->mld_type = type;
1806         hdr->mld_mca = *addr;
1807
1808         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1809                                          IPPROTO_ICMPV6,
1810                                          csum_partial(hdr, len, 0));
1811
1812         rcu_read_lock();
1813         idev = __in6_dev_get(skb->dev);
1814
1815         icmpv6_flow_init(sk, &fl6, type,
1816                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1817                          skb->dev->ifindex);
1818         dst = icmp6_dst_alloc(skb->dev, &fl6);
1819         if (IS_ERR(dst)) {
1820                 err = PTR_ERR(dst);
1821                 goto err_out;
1822         }
1823
1824         skb_dst_set(skb, dst);
1825         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1826                       dst_output);
1827 out:
1828         if (!err) {
1829                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1830                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1831                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1832         } else
1833                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1834
1835         rcu_read_unlock();
1836         return;
1837
1838 err_out:
1839         kfree_skb(skb);
1840         goto out;
1841 }
1842
1843 static void mld_resend_report(struct inet6_dev *idev)
1844 {
1845         if (MLD_V1_SEEN(idev)) {
1846                 struct ifmcaddr6 *mcaddr;
1847                 read_lock_bh(&idev->lock);
1848                 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1849                         if (!(mcaddr->mca_flags & MAF_NOREPORT))
1850                                 igmp6_send(&mcaddr->mca_addr, idev->dev,
1851                                            ICMPV6_MGM_REPORT);
1852                 }
1853                 read_unlock_bh(&idev->lock);
1854         } else {
1855                 mld_send_report(idev, NULL);
1856         }
1857 }
1858
1859 void ipv6_mc_dad_complete(struct inet6_dev *idev)
1860 {
1861         idev->mc_dad_count = idev->mc_qrv;
1862         if (idev->mc_dad_count) {
1863                 mld_resend_report(idev);
1864                 idev->mc_dad_count--;
1865                 if (idev->mc_dad_count)
1866                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1867         }
1868 }
1869
1870 static void mld_dad_timer_expire(unsigned long data)
1871 {
1872         struct inet6_dev *idev = (struct inet6_dev *)data;
1873
1874         mld_resend_report(idev);
1875         if (idev->mc_dad_count) {
1876                 idev->mc_dad_count--;
1877                 if (idev->mc_dad_count)
1878                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1879         }
1880         __in6_dev_put(idev);
1881 }
1882
1883 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1884         const struct in6_addr *psfsrc)
1885 {
1886         struct ip6_sf_list *psf, *psf_prev;
1887         int rv = 0;
1888
1889         psf_prev = NULL;
1890         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1891                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1892                         break;
1893                 psf_prev = psf;
1894         }
1895         if (!psf || psf->sf_count[sfmode] == 0) {
1896                 /* source filter not found, or count wrong =>  bug */
1897                 return -ESRCH;
1898         }
1899         psf->sf_count[sfmode]--;
1900         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1901                 struct inet6_dev *idev = pmc->idev;
1902
1903                 /* no more filters for this source */
1904                 if (psf_prev)
1905                         psf_prev->sf_next = psf->sf_next;
1906                 else
1907                         pmc->mca_sources = psf->sf_next;
1908                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1909                     !MLD_V1_SEEN(idev)) {
1910                         psf->sf_crcount = idev->mc_qrv;
1911                         psf->sf_next = pmc->mca_tomb;
1912                         pmc->mca_tomb = psf;
1913                         rv = 1;
1914                 } else
1915                         kfree(psf);
1916         }
1917         return rv;
1918 }
1919
1920 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1921                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1922                           int delta)
1923 {
1924         struct ifmcaddr6 *pmc;
1925         int     changerec = 0;
1926         int     i, err;
1927
1928         if (!idev)
1929                 return -ENODEV;
1930         read_lock_bh(&idev->lock);
1931         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1932                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1933                         break;
1934         }
1935         if (!pmc) {
1936                 /* MCA not found?? bug */
1937                 read_unlock_bh(&idev->lock);
1938                 return -ESRCH;
1939         }
1940         spin_lock_bh(&pmc->mca_lock);
1941         sf_markstate(pmc);
1942         if (!delta) {
1943                 if (!pmc->mca_sfcount[sfmode]) {
1944                         spin_unlock_bh(&pmc->mca_lock);
1945                         read_unlock_bh(&idev->lock);
1946                         return -EINVAL;
1947                 }
1948                 pmc->mca_sfcount[sfmode]--;
1949         }
1950         err = 0;
1951         for (i=0; i<sfcount; i++) {
1952                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1953
1954                 changerec |= rv > 0;
1955                 if (!err && rv < 0)
1956                         err = rv;
1957         }
1958         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1959             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1960             pmc->mca_sfcount[MCAST_INCLUDE]) {
1961                 struct ip6_sf_list *psf;
1962
1963                 /* filter mode change */
1964                 pmc->mca_sfmode = MCAST_INCLUDE;
1965                 pmc->mca_crcount = idev->mc_qrv;
1966                 idev->mc_ifc_count = pmc->mca_crcount;
1967                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1968                         psf->sf_crcount = 0;
1969                 mld_ifc_event(pmc->idev);
1970         } else if (sf_setstate(pmc) || changerec)
1971                 mld_ifc_event(pmc->idev);
1972         spin_unlock_bh(&pmc->mca_lock);
1973         read_unlock_bh(&idev->lock);
1974         return err;
1975 }
1976
1977 /*
1978  * Add multicast single-source filter to the interface list
1979  */
1980 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1981         const struct in6_addr *psfsrc)
1982 {
1983         struct ip6_sf_list *psf, *psf_prev;
1984
1985         psf_prev = NULL;
1986         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1987                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1988                         break;
1989                 psf_prev = psf;
1990         }
1991         if (!psf) {
1992                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1993                 if (!psf)
1994                         return -ENOBUFS;
1995
1996                 psf->sf_addr = *psfsrc;
1997                 if (psf_prev) {
1998                         psf_prev->sf_next = psf;
1999                 } else
2000                         pmc->mca_sources = psf;
2001         }
2002         psf->sf_count[sfmode]++;
2003         return 0;
2004 }
2005
2006 static void sf_markstate(struct ifmcaddr6 *pmc)
2007 {
2008         struct ip6_sf_list *psf;
2009         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2010
2011         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2012                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2013                         psf->sf_oldin = mca_xcount ==
2014                                 psf->sf_count[MCAST_EXCLUDE] &&
2015                                 !psf->sf_count[MCAST_INCLUDE];
2016                 } else
2017                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2018 }
2019
2020 static int sf_setstate(struct ifmcaddr6 *pmc)
2021 {
2022         struct ip6_sf_list *psf, *dpsf;
2023         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2024         int qrv = pmc->idev->mc_qrv;
2025         int new_in, rv;
2026
2027         rv = 0;
2028         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2029                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2030                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2031                                 !psf->sf_count[MCAST_INCLUDE];
2032                 } else
2033                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2034                 if (new_in) {
2035                         if (!psf->sf_oldin) {
2036                                 struct ip6_sf_list *prev = NULL;
2037
2038                                 for (dpsf=pmc->mca_tomb; dpsf;
2039                                      dpsf=dpsf->sf_next) {
2040                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2041                                             &psf->sf_addr))
2042                                                 break;
2043                                         prev = dpsf;
2044                                 }
2045                                 if (dpsf) {
2046                                         if (prev)
2047                                                 prev->sf_next = dpsf->sf_next;
2048                                         else
2049                                                 pmc->mca_tomb = dpsf->sf_next;
2050                                         kfree(dpsf);
2051                                 }
2052                                 psf->sf_crcount = qrv;
2053                                 rv++;
2054                         }
2055                 } else if (psf->sf_oldin) {
2056                         psf->sf_crcount = 0;
2057                         /*
2058                          * add or update "delete" records if an active filter
2059                          * is now inactive
2060                          */
2061                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2062                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2063                                     &psf->sf_addr))
2064                                         break;
2065                         if (!dpsf) {
2066                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2067                                 if (!dpsf)
2068                                         continue;
2069                                 *dpsf = *psf;
2070                                 /* pmc->mca_lock held by callers */
2071                                 dpsf->sf_next = pmc->mca_tomb;
2072                                 pmc->mca_tomb = dpsf;
2073                         }
2074                         dpsf->sf_crcount = qrv;
2075                         rv++;
2076                 }
2077         }
2078         return rv;
2079 }
2080
2081 /*
2082  * Add multicast source filter list to the interface list
2083  */
2084 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2085                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2086                           int delta)
2087 {
2088         struct ifmcaddr6 *pmc;
2089         int     isexclude;
2090         int     i, err;
2091
2092         if (!idev)
2093                 return -ENODEV;
2094         read_lock_bh(&idev->lock);
2095         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2096                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2097                         break;
2098         }
2099         if (!pmc) {
2100                 /* MCA not found?? bug */
2101                 read_unlock_bh(&idev->lock);
2102                 return -ESRCH;
2103         }
2104         spin_lock_bh(&pmc->mca_lock);
2105
2106         sf_markstate(pmc);
2107         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2108         if (!delta)
2109                 pmc->mca_sfcount[sfmode]++;
2110         err = 0;
2111         for (i=0; i<sfcount; i++) {
2112                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2113                 if (err)
2114                         break;
2115         }
2116         if (err) {
2117                 int j;
2118
2119                 if (!delta)
2120                         pmc->mca_sfcount[sfmode]--;
2121                 for (j=0; j<i; j++)
2122                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2123         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2124                 struct ip6_sf_list *psf;
2125
2126                 /* filter mode change */
2127                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2128                         pmc->mca_sfmode = MCAST_EXCLUDE;
2129                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2130                         pmc->mca_sfmode = MCAST_INCLUDE;
2131                 /* else no filters; keep old mode for reports */
2132
2133                 pmc->mca_crcount = idev->mc_qrv;
2134                 idev->mc_ifc_count = pmc->mca_crcount;
2135                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2136                         psf->sf_crcount = 0;
2137                 mld_ifc_event(idev);
2138         } else if (sf_setstate(pmc))
2139                 mld_ifc_event(idev);
2140         spin_unlock_bh(&pmc->mca_lock);
2141         read_unlock_bh(&idev->lock);
2142         return err;
2143 }
2144
2145 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2146 {
2147         struct ip6_sf_list *psf, *nextpsf;
2148
2149         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2150                 nextpsf = psf->sf_next;
2151                 kfree(psf);
2152         }
2153         pmc->mca_tomb = NULL;
2154         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2155                 nextpsf = psf->sf_next;
2156                 kfree(psf);
2157         }
2158         pmc->mca_sources = NULL;
2159         pmc->mca_sfmode = MCAST_EXCLUDE;
2160         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2161         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2162 }
2163
2164
2165 static void igmp6_join_group(struct ifmcaddr6 *ma)
2166 {
2167         unsigned long delay;
2168
2169         if (ma->mca_flags & MAF_NOREPORT)
2170                 return;
2171
2172         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2173
2174         delay = net_random() % unsolicited_report_interval(ma->idev);
2175
2176         spin_lock_bh(&ma->mca_lock);
2177         if (del_timer(&ma->mca_timer)) {
2178                 atomic_dec(&ma->mca_refcnt);
2179                 delay = ma->mca_timer.expires - jiffies;
2180         }
2181
2182         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2183                 atomic_inc(&ma->mca_refcnt);
2184         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2185         spin_unlock_bh(&ma->mca_lock);
2186 }
2187
2188 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2189                             struct inet6_dev *idev)
2190 {
2191         int err;
2192
2193         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2194          * so no other readers or writers of iml or its sflist
2195          */
2196         if (!iml->sflist) {
2197                 /* any-source empty exclude case */
2198                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2199         }
2200         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2201                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2202         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2203         iml->sflist = NULL;
2204         return err;
2205 }
2206
2207 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2208 {
2209         if (MLD_V1_SEEN(ma->idev)) {
2210                 if (ma->mca_flags & MAF_LAST_REPORTER)
2211                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2212                                 ICMPV6_MGM_REDUCTION);
2213         } else {
2214                 mld_add_delrec(ma->idev, ma);
2215                 mld_ifc_event(ma->idev);
2216         }
2217 }
2218
2219 static void mld_gq_timer_expire(unsigned long data)
2220 {
2221         struct inet6_dev *idev = (struct inet6_dev *)data;
2222
2223         idev->mc_gq_running = 0;
2224         mld_send_report(idev, NULL);
2225         __in6_dev_put(idev);
2226 }
2227
2228 static void mld_ifc_timer_expire(unsigned long data)
2229 {
2230         struct inet6_dev *idev = (struct inet6_dev *)data;
2231
2232         mld_send_cr(idev);
2233         if (idev->mc_ifc_count) {
2234                 idev->mc_ifc_count--;
2235                 if (idev->mc_ifc_count)
2236                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2237         }
2238         __in6_dev_put(idev);
2239 }
2240
2241 static void mld_ifc_event(struct inet6_dev *idev)
2242 {
2243         if (MLD_V1_SEEN(idev))
2244                 return;
2245         idev->mc_ifc_count = idev->mc_qrv;
2246         mld_ifc_start_timer(idev, 1);
2247 }
2248
2249
2250 static void igmp6_timer_handler(unsigned long data)
2251 {
2252         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2253
2254         if (MLD_V1_SEEN(ma->idev))
2255                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2256         else
2257                 mld_send_report(ma->idev, ma);
2258
2259         spin_lock(&ma->mca_lock);
2260         ma->mca_flags |=  MAF_LAST_REPORTER;
2261         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2262         spin_unlock(&ma->mca_lock);
2263         ma_put(ma);
2264 }
2265
2266 /* Device changing type */
2267
2268 void ipv6_mc_unmap(struct inet6_dev *idev)
2269 {
2270         struct ifmcaddr6 *i;
2271
2272         /* Install multicast list, except for all-nodes (already installed) */
2273
2274         read_lock_bh(&idev->lock);
2275         for (i = idev->mc_list; i; i = i->next)
2276                 igmp6_group_dropped(i);
2277         read_unlock_bh(&idev->lock);
2278 }
2279
2280 void ipv6_mc_remap(struct inet6_dev *idev)
2281 {
2282         ipv6_mc_up(idev);
2283 }
2284
2285 /* Device going down */
2286
2287 void ipv6_mc_down(struct inet6_dev *idev)
2288 {
2289         struct ifmcaddr6 *i;
2290
2291         /* Withdraw multicast list */
2292
2293         read_lock_bh(&idev->lock);
2294         idev->mc_ifc_count = 0;
2295         if (del_timer(&idev->mc_ifc_timer))
2296                 __in6_dev_put(idev);
2297         idev->mc_gq_running = 0;
2298         if (del_timer(&idev->mc_gq_timer))
2299                 __in6_dev_put(idev);
2300         if (del_timer(&idev->mc_dad_timer))
2301                 __in6_dev_put(idev);
2302
2303         for (i = idev->mc_list; i; i=i->next)
2304                 igmp6_group_dropped(i);
2305         read_unlock_bh(&idev->lock);
2306
2307         mld_clear_delrec(idev);
2308 }
2309
2310
2311 /* Device going up */
2312
2313 void ipv6_mc_up(struct inet6_dev *idev)
2314 {
2315         struct ifmcaddr6 *i;
2316
2317         /* Install multicast list, except for all-nodes (already installed) */
2318
2319         read_lock_bh(&idev->lock);
2320         for (i = idev->mc_list; i; i=i->next)
2321                 igmp6_group_added(i);
2322         read_unlock_bh(&idev->lock);
2323 }
2324
2325 /* IPv6 device initialization. */
2326
2327 void ipv6_mc_init_dev(struct inet6_dev *idev)
2328 {
2329         write_lock_bh(&idev->lock);
2330         spin_lock_init(&idev->mc_lock);
2331         idev->mc_gq_running = 0;
2332         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2333                         (unsigned long)idev);
2334         idev->mc_tomb = NULL;
2335         idev->mc_ifc_count = 0;
2336         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2337                         (unsigned long)idev);
2338         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2339                     (unsigned long)idev);
2340         idev->mc_qrv = MLD_QRV_DEFAULT;
2341         idev->mc_maxdelay = unsolicited_report_interval(idev);
2342         idev->mc_v1_seen = 0;
2343         write_unlock_bh(&idev->lock);
2344 }
2345
2346 /*
2347  *      Device is about to be destroyed: clean up.
2348  */
2349
2350 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2351 {
2352         struct ifmcaddr6 *i;
2353
2354         /* Deactivate timers */
2355         ipv6_mc_down(idev);
2356
2357         /* Delete all-nodes address. */
2358         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2359          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2360          * fail.
2361          */
2362         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2363
2364         if (idev->cnf.forwarding)
2365                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2366
2367         write_lock_bh(&idev->lock);
2368         while ((i = idev->mc_list) != NULL) {
2369                 idev->mc_list = i->next;
2370                 write_unlock_bh(&idev->lock);
2371
2372                 igmp6_group_dropped(i);
2373                 ma_put(i);
2374
2375                 write_lock_bh(&idev->lock);
2376         }
2377         write_unlock_bh(&idev->lock);
2378 }
2379
2380 #ifdef CONFIG_PROC_FS
2381 struct igmp6_mc_iter_state {
2382         struct seq_net_private p;
2383         struct net_device *dev;
2384         struct inet6_dev *idev;
2385 };
2386
2387 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2388
2389 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2390 {
2391         struct ifmcaddr6 *im = NULL;
2392         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2393         struct net *net = seq_file_net(seq);
2394
2395         state->idev = NULL;
2396         for_each_netdev_rcu(net, state->dev) {
2397                 struct inet6_dev *idev;
2398                 idev = __in6_dev_get(state->dev);
2399                 if (!idev)
2400                         continue;
2401                 read_lock_bh(&idev->lock);
2402                 im = idev->mc_list;
2403                 if (im) {
2404                         state->idev = idev;
2405                         break;
2406                 }
2407                 read_unlock_bh(&idev->lock);
2408         }
2409         return im;
2410 }
2411
2412 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2413 {
2414         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2415
2416         im = im->next;
2417         while (!im) {
2418                 if (likely(state->idev != NULL))
2419                         read_unlock_bh(&state->idev->lock);
2420
2421                 state->dev = next_net_device_rcu(state->dev);
2422                 if (!state->dev) {
2423                         state->idev = NULL;
2424                         break;
2425                 }
2426                 state->idev = __in6_dev_get(state->dev);
2427                 if (!state->idev)
2428                         continue;
2429                 read_lock_bh(&state->idev->lock);
2430                 im = state->idev->mc_list;
2431         }
2432         return im;
2433 }
2434
2435 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2436 {
2437         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2438         if (im)
2439                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2440                         --pos;
2441         return pos ? NULL : im;
2442 }
2443
2444 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2445         __acquires(RCU)
2446 {
2447         rcu_read_lock();
2448         return igmp6_mc_get_idx(seq, *pos);
2449 }
2450
2451 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2452 {
2453         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2454
2455         ++*pos;
2456         return im;
2457 }
2458
2459 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2460         __releases(RCU)
2461 {
2462         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2463
2464         if (likely(state->idev != NULL)) {
2465                 read_unlock_bh(&state->idev->lock);
2466                 state->idev = NULL;
2467         }
2468         state->dev = NULL;
2469         rcu_read_unlock();
2470 }
2471
2472 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2473 {
2474         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2475         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2476
2477         seq_printf(seq,
2478                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2479                    state->dev->ifindex, state->dev->name,
2480                    &im->mca_addr,
2481                    im->mca_users, im->mca_flags,
2482                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2483                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2484         return 0;
2485 }
2486
2487 static const struct seq_operations igmp6_mc_seq_ops = {
2488         .start  =       igmp6_mc_seq_start,
2489         .next   =       igmp6_mc_seq_next,
2490         .stop   =       igmp6_mc_seq_stop,
2491         .show   =       igmp6_mc_seq_show,
2492 };
2493
2494 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2495 {
2496         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2497                             sizeof(struct igmp6_mc_iter_state));
2498 }
2499
2500 static const struct file_operations igmp6_mc_seq_fops = {
2501         .owner          =       THIS_MODULE,
2502         .open           =       igmp6_mc_seq_open,
2503         .read           =       seq_read,
2504         .llseek         =       seq_lseek,
2505         .release        =       seq_release_net,
2506 };
2507
2508 struct igmp6_mcf_iter_state {
2509         struct seq_net_private p;
2510         struct net_device *dev;
2511         struct inet6_dev *idev;
2512         struct ifmcaddr6 *im;
2513 };
2514
2515 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2516
2517 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2518 {
2519         struct ip6_sf_list *psf = NULL;
2520         struct ifmcaddr6 *im = NULL;
2521         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2522         struct net *net = seq_file_net(seq);
2523
2524         state->idev = NULL;
2525         state->im = NULL;
2526         for_each_netdev_rcu(net, state->dev) {
2527                 struct inet6_dev *idev;
2528                 idev = __in6_dev_get(state->dev);
2529                 if (unlikely(idev == NULL))
2530                         continue;
2531                 read_lock_bh(&idev->lock);
2532                 im = idev->mc_list;
2533                 if (likely(im != NULL)) {
2534                         spin_lock_bh(&im->mca_lock);
2535                         psf = im->mca_sources;
2536                         if (likely(psf != NULL)) {
2537                                 state->im = im;
2538                                 state->idev = idev;
2539                                 break;
2540                         }
2541                         spin_unlock_bh(&im->mca_lock);
2542                 }
2543                 read_unlock_bh(&idev->lock);
2544         }
2545         return psf;
2546 }
2547
2548 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2549 {
2550         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2551
2552         psf = psf->sf_next;
2553         while (!psf) {
2554                 spin_unlock_bh(&state->im->mca_lock);
2555                 state->im = state->im->next;
2556                 while (!state->im) {
2557                         if (likely(state->idev != NULL))
2558                                 read_unlock_bh(&state->idev->lock);
2559
2560                         state->dev = next_net_device_rcu(state->dev);
2561                         if (!state->dev) {
2562                                 state->idev = NULL;
2563                                 goto out;
2564                         }
2565                         state->idev = __in6_dev_get(state->dev);
2566                         if (!state->idev)
2567                                 continue;
2568                         read_lock_bh(&state->idev->lock);
2569                         state->im = state->idev->mc_list;
2570                 }
2571                 if (!state->im)
2572                         break;
2573                 spin_lock_bh(&state->im->mca_lock);
2574                 psf = state->im->mca_sources;
2575         }
2576 out:
2577         return psf;
2578 }
2579
2580 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2581 {
2582         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2583         if (psf)
2584                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2585                         --pos;
2586         return pos ? NULL : psf;
2587 }
2588
2589 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2590         __acquires(RCU)
2591 {
2592         rcu_read_lock();
2593         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2594 }
2595
2596 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2597 {
2598         struct ip6_sf_list *psf;
2599         if (v == SEQ_START_TOKEN)
2600                 psf = igmp6_mcf_get_first(seq);
2601         else
2602                 psf = igmp6_mcf_get_next(seq, v);
2603         ++*pos;
2604         return psf;
2605 }
2606
2607 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2608         __releases(RCU)
2609 {
2610         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2611         if (likely(state->im != NULL)) {
2612                 spin_unlock_bh(&state->im->mca_lock);
2613                 state->im = NULL;
2614         }
2615         if (likely(state->idev != NULL)) {
2616                 read_unlock_bh(&state->idev->lock);
2617                 state->idev = NULL;
2618         }
2619         state->dev = NULL;
2620         rcu_read_unlock();
2621 }
2622
2623 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2624 {
2625         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2626         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2627
2628         if (v == SEQ_START_TOKEN) {
2629                 seq_printf(seq,
2630                            "%3s %6s "
2631                            "%32s %32s %6s %6s\n", "Idx",
2632                            "Device", "Multicast Address",
2633                            "Source Address", "INC", "EXC");
2634         } else {
2635                 seq_printf(seq,
2636                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2637                            state->dev->ifindex, state->dev->name,
2638                            &state->im->mca_addr,
2639                            &psf->sf_addr,
2640                            psf->sf_count[MCAST_INCLUDE],
2641                            psf->sf_count[MCAST_EXCLUDE]);
2642         }
2643         return 0;
2644 }
2645
2646 static const struct seq_operations igmp6_mcf_seq_ops = {
2647         .start  =       igmp6_mcf_seq_start,
2648         .next   =       igmp6_mcf_seq_next,
2649         .stop   =       igmp6_mcf_seq_stop,
2650         .show   =       igmp6_mcf_seq_show,
2651 };
2652
2653 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2654 {
2655         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2656                             sizeof(struct igmp6_mcf_iter_state));
2657 }
2658
2659 static const struct file_operations igmp6_mcf_seq_fops = {
2660         .owner          =       THIS_MODULE,
2661         .open           =       igmp6_mcf_seq_open,
2662         .read           =       seq_read,
2663         .llseek         =       seq_lseek,
2664         .release        =       seq_release_net,
2665 };
2666
2667 static int __net_init igmp6_proc_init(struct net *net)
2668 {
2669         int err;
2670
2671         err = -ENOMEM;
2672         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2673                 goto out;
2674         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2675                          &igmp6_mcf_seq_fops))
2676                 goto out_proc_net_igmp6;
2677
2678         err = 0;
2679 out:
2680         return err;
2681
2682 out_proc_net_igmp6:
2683         remove_proc_entry("igmp6", net->proc_net);
2684         goto out;
2685 }
2686
2687 static void __net_exit igmp6_proc_exit(struct net *net)
2688 {
2689         remove_proc_entry("mcfilter6", net->proc_net);
2690         remove_proc_entry("igmp6", net->proc_net);
2691 }
2692 #else
2693 static inline int igmp6_proc_init(struct net *net)
2694 {
2695         return 0;
2696 }
2697 static inline void igmp6_proc_exit(struct net *net)
2698 {
2699 }
2700 #endif
2701
2702 static int __net_init igmp6_net_init(struct net *net)
2703 {
2704         int err;
2705
2706         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2707                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2708         if (err < 0) {
2709                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2710                        err);
2711                 goto out;
2712         }
2713
2714         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2715
2716         err = igmp6_proc_init(net);
2717         if (err)
2718                 goto out_sock_create;
2719 out:
2720         return err;
2721
2722 out_sock_create:
2723         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2724         goto out;
2725 }
2726
2727 static void __net_exit igmp6_net_exit(struct net *net)
2728 {
2729         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2730         igmp6_proc_exit(net);
2731 }
2732
2733 static struct pernet_operations igmp6_net_ops = {
2734         .init = igmp6_net_init,
2735         .exit = igmp6_net_exit,
2736 };
2737
2738 int __init igmp6_init(void)
2739 {
2740         return register_pernet_subsys(&igmp6_net_ops);
2741 }
2742
2743 void igmp6_cleanup(void)
2744 {
2745         unregister_pernet_subsys(&igmp6_net_ops);
2746 }