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
 111 #define MLD_QRV_DEFAULT         2
 112
 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 114                 (idev)->cnf.force_mld_version == 1 || \
 115                 ((idev)->mc_v1_seen && \
 116                 time_before(jiffies, (idev)->mc_v1_seen)))
 117
 118 #define IPV6_MLD_MAX_MSF        64
 119
 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 121
 122 /*
 123  *      socket join on multicast group
 124  */
 125
 126 #define for_each_pmc_rcu(np, pmc)                               \
 127         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 128              pmc != NULL;                                       \
 129              pmc = rcu_dereference(pmc->next))
 130
 131 static int unsolicited_report_interval(struct inet6_dev *idev)
 132 {
 133         int iv;
 134
 135         if (MLD_V1_SEEN(idev))
 136                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 137         else
 138                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 139
 140         return iv > 0 ? iv : 1;
 141 }
 142
 143 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 144 {
 145         struct net_device *dev = NULL;
 146         struct ipv6_mc_socklist *mc_lst;
 147         struct ipv6_pinfo *np = inet6_sk(sk);
 148         struct net *net = sock_net(sk);
 149         int err;
 150
 151         if (!ipv6_addr_is_multicast(addr))
 152                 return -EINVAL;
 153
 154         rcu_read_lock();
 155         for_each_pmc_rcu(np, mc_lst) {
 156                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 157                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 158                         rcu_read_unlock();
 159                         return -EADDRINUSE;
 160                 }
 161         }
 162         rcu_read_unlock();
 163
 164         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 165
 166         if (mc_lst == NULL)
 167                 return -ENOMEM;
 168
 169         mc_lst->next = NULL;
 170         mc_lst->addr = *addr;
 171
 172         rcu_read_lock();
 173         if (ifindex == 0) {
 174                 struct rt6_info *rt;
 175                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 176                 if (rt) {
 177                         dev = rt->dst.dev;
 178                         ip6_rt_put(rt);
 179                 }
 180         } else
 181                 dev = dev_get_by_index_rcu(net, ifindex);
 182
 183         if (dev == NULL) {
 184                 rcu_read_unlock();
 185                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 186                 return -ENODEV;
 187         }
 188
 189         mc_lst->ifindex = dev->ifindex;
 190         mc_lst->sfmode = MCAST_EXCLUDE;
 191         rwlock_init(&mc_lst->sflock);
 192         mc_lst->sflist = NULL;
 193
 194         /*
 195          *      now add/increase the group membership on the device
 196          */
 197
 198         err = ipv6_dev_mc_inc(dev, addr);
 199
 200         if (err) {
 201                 rcu_read_unlock();
 202                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 203                 return err;
 204         }
 205
 206         spin_lock(&ipv6_sk_mc_lock);
 207         mc_lst->next = np->ipv6_mc_list;
 208         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 209         spin_unlock(&ipv6_sk_mc_lock);
 210
 211         rcu_read_unlock();
 212
 213         return 0;
 214 }
 215
 216 /*
 217  *      socket leave on multicast group
 218  */
 219 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 220 {
 221         struct ipv6_pinfo *np = inet6_sk(sk);
 222         struct ipv6_mc_socklist *mc_lst;
 223         struct ipv6_mc_socklist __rcu **lnk;
 224         struct net *net = sock_net(sk);
 225
 226         if (!ipv6_addr_is_multicast(addr))
 227                 return -EINVAL;
 228
 229         spin_lock(&ipv6_sk_mc_lock);
 230         for (lnk = &np->ipv6_mc_list;
 231              (mc_lst = rcu_dereference_protected(*lnk,
 232                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 233               lnk = &mc_lst->next) {
 234                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 235                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 236                         struct net_device *dev;
 237
 238                         *lnk = mc_lst->next;
 239                         spin_unlock(&ipv6_sk_mc_lock);
 240
 241                         rcu_read_lock();
 242                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 243                         if (dev != NULL) {
 244                                 struct inet6_dev *idev = __in6_dev_get(dev);
 245
 246                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 247                                 if (idev)
 248                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 249                         } else
 250                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 251                         rcu_read_unlock();
 252                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 253                         kfree_rcu(mc_lst, rcu);
 254                         return 0;
 255                 }
 256         }
 257         spin_unlock(&ipv6_sk_mc_lock);
 258
 259         return -EADDRNOTAVAIL;
 260 }
 261
 262 /* called with rcu_read_lock() */
 263 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 264                                              const struct in6_addr *group,
 265                                              int ifindex)
 266 {
 267         struct net_device *dev = NULL;
 268         struct inet6_dev *idev = NULL;
 269
 270         if (ifindex == 0) {
 271                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 272
 273                 if (rt) {
 274                         dev = rt->dst.dev;
 275                         ip6_rt_put(rt);
 276                 }
 277         } else
 278                 dev = dev_get_by_index_rcu(net, ifindex);
 279
 280         if (!dev)
 281                 return NULL;
 282         idev = __in6_dev_get(dev);
 283         if (!idev)
 284                 return NULL;
 285         read_lock_bh(&idev->lock);
 286         if (idev->dead) {
 287                 read_unlock_bh(&idev->lock);
 288                 return NULL;
 289         }
 290         return idev;
 291 }
 292
 293 void ipv6_sock_mc_close(struct sock *sk)
 294 {
 295         struct ipv6_pinfo *np = inet6_sk(sk);
 296         struct ipv6_mc_socklist *mc_lst;
 297         struct net *net = sock_net(sk);
 298
 299         if (!rcu_access_pointer(np->ipv6_mc_list))
 300                 return;
 301
 302         spin_lock(&ipv6_sk_mc_lock);
 303         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 304                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 305                 struct net_device *dev;
 306
 307                 np->ipv6_mc_list = mc_lst->next;
 308                 spin_unlock(&ipv6_sk_mc_lock);
 309
 310                 rcu_read_lock();
 311                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 312                 if (dev) {
 313                         struct inet6_dev *idev = __in6_dev_get(dev);
 314
 315                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 316                         if (idev)
 317                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 318                 } else
 319                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 320                 rcu_read_unlock();
 321
 322                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 323                 kfree_rcu(mc_lst, rcu);
 324
 325                 spin_lock(&ipv6_sk_mc_lock);
 326         }
 327         spin_unlock(&ipv6_sk_mc_lock);
 328 }
 329
 330 int ip6_mc_source(int add, int omode, struct sock *sk,
 331         struct group_source_req *pgsr)
 332 {
 333         struct in6_addr *source, *group;
 334         struct ipv6_mc_socklist *pmc;
 335         struct inet6_dev *idev;
 336         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 337         struct ip6_sf_socklist *psl;
 338         struct net *net = sock_net(sk);
 339         int i, j, rv;
 340         int leavegroup = 0;
 341         int pmclocked = 0;
 342         int err;
 343
 344         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 345         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 346
 347         if (!ipv6_addr_is_multicast(group))
 348                 return -EINVAL;
 349
 350         rcu_read_lock();
 351         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 352         if (!idev) {
 353                 rcu_read_unlock();
 354                 return -ENODEV;
 355         }
 356
 357         err = -EADDRNOTAVAIL;
 358
 359         for_each_pmc_rcu(inet6, pmc) {
 360                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 361                         continue;
 362                 if (ipv6_addr_equal(&pmc->addr, group))
 363                         break;
 364         }
 365         if (!pmc) {             /* must have a prior join */
 366                 err = -EINVAL;
 367                 goto done;
 368         }
 369         /* if a source filter was set, must be the same mode as before */
 370         if (pmc->sflist) {
 371                 if (pmc->sfmode != omode) {
 372                         err = -EINVAL;
 373                         goto done;
 374                 }
 375         } else if (pmc->sfmode != omode) {
 376                 /* allow mode switches for empty-set filters */
 377                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 378                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 379                 pmc->sfmode = omode;
 380         }
 381
 382         write_lock(&pmc->sflock);
 383         pmclocked = 1;
 384
 385         psl = pmc->sflist;
 386         if (!add) {
 387                 if (!psl)
 388                         goto done;      /* err = -EADDRNOTAVAIL */
 389                 rv = !0;
 390                 for (i=0; i<psl->sl_count; i++) {
 391                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 392                         if (rv == 0)
 393                                 break;
 394                 }
 395                 if (rv)         /* source not found */
 396                         goto done;      /* err = -EADDRNOTAVAIL */
 397
 398                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 399                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 400                         leavegroup = 1;
 401                         goto done;
 402                 }
 403
 404                 /* update the interface filter */
 405                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 406
 407                 for (j=i+1; j<psl->sl_count; j++)
 408                         psl->sl_addr[j-1] = psl->sl_addr[j];
 409                 psl->sl_count--;
 410                 err = 0;
 411                 goto done;
 412         }
 413         /* else, add a new source to the filter */
 414
 415         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 416                 err = -ENOBUFS;
 417                 goto done;
 418         }
 419         if (!psl || psl->sl_count == psl->sl_max) {
 420                 struct ip6_sf_socklist *newpsl;
 421                 int count = IP6_SFBLOCK;
 422
 423                 if (psl)
 424                         count += psl->sl_max;
 425                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 426                 if (!newpsl) {
 427                         err = -ENOBUFS;
 428                         goto done;
 429                 }
 430                 newpsl->sl_max = count;
 431                 newpsl->sl_count = count - IP6_SFBLOCK;
 432                 if (psl) {
 433                         for (i=0; i<psl->sl_count; i++)
 434                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 435                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 436                 }
 437                 pmc->sflist = psl = newpsl;
 438         }
 439         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 440         for (i=0; i<psl->sl_count; i++) {
 441                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 442                 if (rv == 0) /* There is an error in the address. */
 443                         goto done;
 444         }
 445         for (j=psl->sl_count-1; j>=i; j--)
 446                 psl->sl_addr[j+1] = psl->sl_addr[j];
 447         psl->sl_addr[i] = *source;
 448         psl->sl_count++;
 449         err = 0;
 450         /* update the interface list */
 451         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 452 done:
 453         if (pmclocked)
 454                 write_unlock(&pmc->sflock);
 455         read_unlock_bh(&idev->lock);
 456         rcu_read_unlock();
 457         if (leavegroup)
 458                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 459         return err;
 460 }
 461
 462 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 463 {
 464         const struct in6_addr *group;
 465         struct ipv6_mc_socklist *pmc;
 466         struct inet6_dev *idev;
 467         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 468         struct ip6_sf_socklist *newpsl, *psl;
 469         struct net *net = sock_net(sk);
 470         int leavegroup = 0;
 471         int i, err;
 472
 473         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 474
 475         if (!ipv6_addr_is_multicast(group))
 476                 return -EINVAL;
 477         if (gsf->gf_fmode != MCAST_INCLUDE &&
 478             gsf->gf_fmode != MCAST_EXCLUDE)
 479                 return -EINVAL;
 480
 481         rcu_read_lock();
 482         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 483
 484         if (!idev) {
 485                 rcu_read_unlock();
 486                 return -ENODEV;
 487         }
 488
 489         err = 0;
 490
 491         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 492                 leavegroup = 1;
 493                 goto done;
 494         }
 495
 496         for_each_pmc_rcu(inet6, pmc) {
 497                 if (pmc->ifindex != gsf->gf_interface)
 498                         continue;
 499                 if (ipv6_addr_equal(&pmc->addr, group))
 500                         break;
 501         }
 502         if (!pmc) {             /* must have a prior join */
 503                 err = -EINVAL;
 504                 goto done;
 505         }
 506         if (gsf->gf_numsrc) {
 507                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 508                                                           GFP_ATOMIC);
 509                 if (!newpsl) {
 510                         err = -ENOBUFS;
 511                         goto done;
 512                 }
 513                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 514                 for (i=0; i<newpsl->sl_count; ++i) {
 515                         struct sockaddr_in6 *psin6;
 516
 517                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 518                         newpsl->sl_addr[i] = psin6->sin6_addr;
 519                 }
 520                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 521                         newpsl->sl_count, newpsl->sl_addr, 0);
 522                 if (err) {
 523                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 524                         goto done;
 525                 }
 526         } else {
 527                 newpsl = NULL;
 528                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 529         }
 530
 531         write_lock(&pmc->sflock);
 532         psl = pmc->sflist;
 533         if (psl) {
 534                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 535                         psl->sl_count, psl->sl_addr, 0);
 536                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 537         } else
 538                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 539         pmc->sflist = newpsl;
 540         pmc->sfmode = gsf->gf_fmode;
 541         write_unlock(&pmc->sflock);
 542         err = 0;
 543 done:
 544         read_unlock_bh(&idev->lock);
 545         rcu_read_unlock();
 546         if (leavegroup)
 547                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 548         return err;
 549 }
 550
 551 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 552         struct group_filter __user *optval, int __user *optlen)
 553 {
 554         int err, i, count, copycount;
 555         const struct in6_addr *group;
 556         struct ipv6_mc_socklist *pmc;
 557         struct inet6_dev *idev;
 558         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 559         struct ip6_sf_socklist *psl;
 560         struct net *net = sock_net(sk);
 561
 562         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 563
 564         if (!ipv6_addr_is_multicast(group))
 565                 return -EINVAL;
 566
 567         rcu_read_lock();
 568         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 569
 570         if (!idev) {
 571                 rcu_read_unlock();
 572                 return -ENODEV;
 573         }
 574
 575         err = -EADDRNOTAVAIL;
 576         /*
 577          * changes to the ipv6_mc_list require the socket lock and
 578          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 579          * so reading the list is safe.
 580          */
 581
 582         for_each_pmc_rcu(inet6, pmc) {
 583                 if (pmc->ifindex != gsf->gf_interface)
 584                         continue;
 585                 if (ipv6_addr_equal(group, &pmc->addr))
 586                         break;
 587         }
 588         if (!pmc)               /* must have a prior join */
 589                 goto done;
 590         gsf->gf_fmode = pmc->sfmode;
 591         psl = pmc->sflist;
 592         count = psl ? psl->sl_count : 0;
 593         read_unlock_bh(&idev->lock);
 594         rcu_read_unlock();
 595
 596         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 597         gsf->gf_numsrc = count;
 598         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 599             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 600                 return -EFAULT;
 601         }
 602         /* changes to psl require the socket lock, a read lock on
 603          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 604          * have the socket lock, so reading here is safe.
 605          */
 606         for (i=0; i<copycount; i++) {
 607                 struct sockaddr_in6 *psin6;
 608                 struct sockaddr_storage ss;
 609
 610                 psin6 = (struct sockaddr_in6 *)&ss;
 611                 memset(&ss, 0, sizeof(ss));
 612                 psin6->sin6_family = AF_INET6;
 613                 psin6->sin6_addr = psl->sl_addr[i];
 614                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 615                         return -EFAULT;
 616         }
 617         return 0;
 618 done:
 619         read_unlock_bh(&idev->lock);
 620         rcu_read_unlock();
 621         return err;
 622 }
 623
 624 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 625                     const struct in6_addr *src_addr)
 626 {
 627         struct ipv6_pinfo *np = inet6_sk(sk);
 628         struct ipv6_mc_socklist *mc;
 629         struct ip6_sf_socklist *psl;
 630         bool rv = true;
 631
 632         rcu_read_lock();
 633         for_each_pmc_rcu(np, mc) {
 634                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 635                         break;
 636         }
 637         if (!mc) {
 638                 rcu_read_unlock();
 639                 return true;
 640         }
 641         read_lock(&mc->sflock);
 642         psl = mc->sflist;
 643         if (!psl) {
 644                 rv = mc->sfmode == MCAST_EXCLUDE;
 645         } else {
 646                 int i;
 647
 648                 for (i=0; i<psl->sl_count; i++) {
 649                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 650                                 break;
 651                 }
 652                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 653                         rv = false;
 654                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 655                         rv = false;
 656         }
 657         read_unlock(&mc->sflock);
 658         rcu_read_unlock();
 659
 660         return rv;
 661 }
 662
 663 static void ma_put(struct ifmcaddr6 *mc)
 664 {
 665         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 666                 in6_dev_put(mc->idev);
 667                 kfree(mc);
 668         }
 669 }
 670
 671 static void igmp6_group_added(struct ifmcaddr6 *mc)
 672 {
 673         struct net_device *dev = mc->idev->dev;
 674         char buf[MAX_ADDR_LEN];
 675
 676         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 677             IPV6_ADDR_SCOPE_LINKLOCAL)
 678                 return;
 679
 680         spin_lock_bh(&mc->mca_lock);
 681         if (!(mc->mca_flags&MAF_LOADED)) {
 682                 mc->mca_flags |= MAF_LOADED;
 683                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 684                         dev_mc_add(dev, buf);
 685         }
 686         spin_unlock_bh(&mc->mca_lock);
 687
 688         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 689                 return;
 690
 691         if (MLD_V1_SEEN(mc->idev)) {
 692                 igmp6_join_group(mc);
 693                 return;
 694         }
 695         /* else v2 */
 696
 697         mc->mca_crcount = mc->idev->mc_qrv;
 698         mld_ifc_event(mc->idev);
 699 }
 700
 701 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 702 {
 703         struct net_device *dev = mc->idev->dev;
 704         char buf[MAX_ADDR_LEN];
 705
 706         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 707             IPV6_ADDR_SCOPE_LINKLOCAL)
 708                 return;
 709
 710         spin_lock_bh(&mc->mca_lock);
 711         if (mc->mca_flags&MAF_LOADED) {
 712                 mc->mca_flags &= ~MAF_LOADED;
 713                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 714                         dev_mc_del(dev, buf);
 715         }
 716
 717         if (mc->mca_flags & MAF_NOREPORT)
 718                 goto done;
 719         spin_unlock_bh(&mc->mca_lock);
 720
 721         if (!mc->idev->dead)
 722                 igmp6_leave_group(mc);
 723
 724         spin_lock_bh(&mc->mca_lock);
 725         if (del_timer(&mc->mca_timer))
 726                 atomic_dec(&mc->mca_refcnt);
 727 done:
 728         ip6_mc_clear_src(mc);
 729         spin_unlock_bh(&mc->mca_lock);
 730 }
 731
 732 /*
 733  * deleted ifmcaddr6 manipulation
 734  */
 735 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 736 {
 737         struct ifmcaddr6 *pmc;
 738
 739         /* this is an "ifmcaddr6" for convenience; only the fields below
 740          * are actually used. In particular, the refcnt and users are not
 741          * used for management of the delete list. Using the same structure
 742          * for deleted items allows change reports to use common code with
 743          * non-deleted or query-response MCA's.
 744          */
 745         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 746         if (!pmc)
 747                 return;
 748
 749         spin_lock_bh(&im->mca_lock);
 750         spin_lock_init(&pmc->mca_lock);
 751         pmc->idev = im->idev;
 752         in6_dev_hold(idev);
 753         pmc->mca_addr = im->mca_addr;
 754         pmc->mca_crcount = idev->mc_qrv;
 755         pmc->mca_sfmode = im->mca_sfmode;
 756         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 757                 struct ip6_sf_list *psf;
 758
 759                 pmc->mca_tomb = im->mca_tomb;
 760                 pmc->mca_sources = im->mca_sources;
 761                 im->mca_tomb = im->mca_sources = NULL;
 762                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 763                         psf->sf_crcount = pmc->mca_crcount;
 764         }
 765         spin_unlock_bh(&im->mca_lock);
 766
 767         spin_lock_bh(&idev->mc_lock);
 768         pmc->next = idev->mc_tomb;
 769         idev->mc_tomb = pmc;
 770         spin_unlock_bh(&idev->mc_lock);
 771 }
 772
 773 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 774 {
 775         struct ifmcaddr6 *pmc, *pmc_prev;
 776         struct ip6_sf_list *psf, *psf_next;
 777
 778         spin_lock_bh(&idev->mc_lock);
 779         pmc_prev = NULL;
 780         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 781                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 782                         break;
 783                 pmc_prev = pmc;
 784         }
 785         if (pmc) {
 786                 if (pmc_prev)
 787                         pmc_prev->next = pmc->next;
 788                 else
 789                         idev->mc_tomb = pmc->next;
 790         }
 791         spin_unlock_bh(&idev->mc_lock);
 792
 793         if (pmc) {
 794                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 795                         psf_next = psf->sf_next;
 796                         kfree(psf);
 797                 }
 798                 in6_dev_put(pmc->idev);
 799                 kfree(pmc);
 800         }
 801 }
 802
 803 static void mld_clear_delrec(struct inet6_dev *idev)
 804 {
 805         struct ifmcaddr6 *pmc, *nextpmc;
 806
 807         spin_lock_bh(&idev->mc_lock);
 808         pmc = idev->mc_tomb;
 809         idev->mc_tomb = NULL;
 810         spin_unlock_bh(&idev->mc_lock);
 811
 812         for (; pmc; pmc = nextpmc) {
 813                 nextpmc = pmc->next;
 814                 ip6_mc_clear_src(pmc);
 815                 in6_dev_put(pmc->idev);
 816                 kfree(pmc);
 817         }
 818
 819         /* clear dead sources, too */
 820         read_lock_bh(&idev->lock);
 821         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 822                 struct ip6_sf_list *psf, *psf_next;
 823
 824                 spin_lock_bh(&pmc->mca_lock);
 825                 psf = pmc->mca_tomb;
 826                 pmc->mca_tomb = NULL;
 827                 spin_unlock_bh(&pmc->mca_lock);
 828                 for (; psf; psf=psf_next) {
 829                         psf_next = psf->sf_next;
 830                         kfree(psf);
 831                 }
 832         }
 833         read_unlock_bh(&idev->lock);
 834 }
 835
 836
 837 /*
 838  *      device multicast group inc (add if not found)
 839  */
 840 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 841 {
 842         struct ifmcaddr6 *mc;
 843         struct inet6_dev *idev;
 844
 845         /* we need to take a reference on idev */
 846         idev = in6_dev_get(dev);
 847
 848         if (idev == NULL)
 849                 return -EINVAL;
 850
 851         write_lock_bh(&idev->lock);
 852         if (idev->dead) {
 853                 write_unlock_bh(&idev->lock);
 854                 in6_dev_put(idev);
 855                 return -ENODEV;
 856         }
 857
 858         for (mc = idev->mc_list; mc; mc = mc->next) {
 859                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 860                         mc->mca_users++;
 861                         write_unlock_bh(&idev->lock);
 862                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 863                                 NULL, 0);
 864                         in6_dev_put(idev);
 865                         return 0;
 866                 }
 867         }
 868
 869         /*
 870          *      not found: create a new one.
 871          */
 872
 873         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 874
 875         if (mc == NULL) {
 876                 write_unlock_bh(&idev->lock);
 877                 in6_dev_put(idev);
 878                 return -ENOMEM;
 879         }
 880
 881         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 882
 883         mc->mca_addr = *addr;
 884         mc->idev = idev; /* (reference taken) */
 885         mc->mca_users = 1;
 886         /* mca_stamp should be updated upon changes */
 887         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 888         atomic_set(&mc->mca_refcnt, 2);
 889         spin_lock_init(&mc->mca_lock);
 890
 891         /* initial mode is (EX, empty) */
 892         mc->mca_sfmode = MCAST_EXCLUDE;
 893         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 894
 895         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 896             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 897                 mc->mca_flags |= MAF_NOREPORT;
 898
 899         mc->next = idev->mc_list;
 900         idev->mc_list = mc;
 901         write_unlock_bh(&idev->lock);
 902
 903         mld_del_delrec(idev, &mc->mca_addr);
 904         igmp6_group_added(mc);
 905         ma_put(mc);
 906         return 0;
 907 }
 908
 909 /*
 910  *      device multicast group del
 911  */
 912 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 913 {
 914         struct ifmcaddr6 *ma, **map;
 915
 916         write_lock_bh(&idev->lock);
 917         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 918                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 919                         if (--ma->mca_users == 0) {
 920                                 *map = ma->next;
 921                                 write_unlock_bh(&idev->lock);
 922
 923                                 igmp6_group_dropped(ma);
 924
 925                                 ma_put(ma);
 926                                 return 0;
 927                         }
 928                         write_unlock_bh(&idev->lock);
 929                         return 0;
 930                 }
 931         }
 932         write_unlock_bh(&idev->lock);
 933
 934         return -ENOENT;
 935 }
 936
 937 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 938 {
 939         struct inet6_dev *idev;
 940         int err;
 941
 942         rcu_read_lock();
 943
 944         idev = __in6_dev_get(dev);
 945         if (!idev)
 946                 err = -ENODEV;
 947         else
 948                 err = __ipv6_dev_mc_dec(idev, addr);
 949
 950         rcu_read_unlock();
 951         return err;
 952 }
 953
 954 /*
 955  *      check if the interface/address pair is valid
 956  */
 957 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 958                          const struct in6_addr *src_addr)
 959 {
 960         struct inet6_dev *idev;
 961         struct ifmcaddr6 *mc;
 962         bool rv = false;
 963
 964         rcu_read_lock();
 965         idev = __in6_dev_get(dev);
 966         if (idev) {
 967                 read_lock_bh(&idev->lock);
 968                 for (mc = idev->mc_list; mc; mc=mc->next) {
 969                         if (ipv6_addr_equal(&mc->mca_addr, group))
 970                                 break;
 971                 }
 972                 if (mc) {
 973                         if (src_addr && !ipv6_addr_any(src_addr)) {
 974                                 struct ip6_sf_list *psf;
 975
 976                                 spin_lock_bh(&mc->mca_lock);
 977                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 978                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 979                                                 break;
 980                                 }
 981                                 if (psf)
 982                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 983                                                 psf->sf_count[MCAST_EXCLUDE] !=
 984                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 985                                 else
 986                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 987                                 spin_unlock_bh(&mc->mca_lock);
 988                         } else
 989                                 rv = true; /* don't filter unspecified source */
 990                 }
 991                 read_unlock_bh(&idev->lock);
 992         }
 993         rcu_read_unlock();
 994         return rv;
 995 }
 996
 997 static void mld_gq_start_timer(struct inet6_dev *idev)
 998 {
 999         unsigned long tv = net_random() % idev->mc_maxdelay;
1000
1001         idev->mc_gq_running = 1;
1002         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1003                 in6_dev_hold(idev);
1004 }
1005
1006 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1007 {
1008         unsigned long tv = net_random() % delay;
1009
1010         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1011                 in6_dev_hold(idev);
1012 }
1013
1014 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1015 {
1016         unsigned long tv = net_random() % delay;
1017
1018         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1019                 in6_dev_hold(idev);
1020 }
1021
1022 /*
1023  *      IGMP handling (alias multicast ICMPv6 messages)
1024  */
1025
1026 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1027 {
1028         unsigned long delay = resptime;
1029
1030         /* Do not start timer for these addresses */
1031         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1032             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1033                 return;
1034
1035         if (del_timer(&ma->mca_timer)) {
1036                 atomic_dec(&ma->mca_refcnt);
1037                 delay = ma->mca_timer.expires - jiffies;
1038         }
1039
1040         if (delay >= resptime) {
1041                 if (resptime)
1042                         delay = net_random() % resptime;
1043                 else
1044                         delay = 1;
1045         }
1046         ma->mca_timer.expires = jiffies + delay;
1047         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1048                 atomic_inc(&ma->mca_refcnt);
1049         ma->mca_flags |= MAF_TIMER_RUNNING;
1050 }
1051
1052 /* mark EXCLUDE-mode sources */
1053 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1054                              const struct in6_addr *srcs)
1055 {
1056         struct ip6_sf_list *psf;
1057         int i, scount;
1058
1059         scount = 0;
1060         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1061                 if (scount == nsrcs)
1062                         break;
1063                 for (i=0; i<nsrcs; i++) {
1064                         /* skip inactive filters */
1065                         if (psf->sf_count[MCAST_INCLUDE] ||
1066                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1067                             psf->sf_count[MCAST_EXCLUDE])
1068                                 break;
1069                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1070                                 scount++;
1071                                 break;
1072                         }
1073                 }
1074         }
1075         pmc->mca_flags &= ~MAF_GSQUERY;
1076         if (scount == nsrcs)    /* all sources excluded */
1077                 return false;
1078         return true;
1079 }
1080
1081 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1082                             const struct in6_addr *srcs)
1083 {
1084         struct ip6_sf_list *psf;
1085         int i, scount;
1086
1087         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1088                 return mld_xmarksources(pmc, nsrcs, srcs);
1089
1090         /* mark INCLUDE-mode sources */
1091
1092         scount = 0;
1093         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1094                 if (scount == nsrcs)
1095                         break;
1096                 for (i=0; i<nsrcs; i++) {
1097                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1098                                 psf->sf_gsresp = 1;
1099                                 scount++;
1100                                 break;
1101                         }
1102                 }
1103         }
1104         if (!scount) {
1105                 pmc->mca_flags &= ~MAF_GSQUERY;
1106                 return false;
1107         }
1108         pmc->mca_flags |= MAF_GSQUERY;
1109         return true;
1110 }
1111
1112 /* called with rcu_read_lock() */
1113 int igmp6_event_query(struct sk_buff *skb)
1114 {
1115         struct mld2_query *mlh2 = NULL;
1116         struct ifmcaddr6 *ma;
1117         const struct in6_addr *group;
1118         unsigned long max_delay;
1119         struct inet6_dev *idev;
1120         struct mld_msg *mld;
1121         int group_type;
1122         int mark = 0;
1123         int len;
1124
1125         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1126                 return -EINVAL;
1127
1128         /* compute payload length excluding extension headers */
1129         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1130         len -= skb_network_header_len(skb);
1131
1132         /* Drop queries with not link local source */
1133         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1134                 return -EINVAL;
1135
1136         idev = __in6_dev_get(skb->dev);
1137
1138         if (idev == NULL)
1139                 return 0;
1140
1141         mld = (struct mld_msg *)icmp6_hdr(skb);
1142         group = &mld->mld_mca;
1143         group_type = ipv6_addr_type(group);
1144
1145         if (group_type != IPV6_ADDR_ANY &&
1146             !(group_type&IPV6_ADDR_MULTICAST))
1147                 return -EINVAL;
1148
1149         if (len == 24) {
1150                 int switchback;
1151                 /* MLDv1 router present */
1152
1153                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1154                 switchback = (idev->mc_qrv + 1) * max_delay;
1155                 idev->mc_v1_seen = jiffies + switchback;
1156
1157                 /* cancel the interface change timer */
1158                 idev->mc_ifc_count = 0;
1159                 if (del_timer(&idev->mc_ifc_timer))
1160                         __in6_dev_put(idev);
1161                 /* clear deleted report items */
1162                 mld_clear_delrec(idev);
1163         } else if (len >= 28) {
1164                 int srcs_offset = sizeof(struct mld2_query) -
1165                                   sizeof(struct icmp6hdr);
1166                 if (!pskb_may_pull(skb, srcs_offset))
1167                         return -EINVAL;
1168
1169                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1170
1171                 max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mlh2->mld2q_mrc))), 1UL);
1172
1173                 idev->mc_maxdelay = max_delay;
1174
1175                 if (mlh2->mld2q_qrv)
1176                         idev->mc_qrv = mlh2->mld2q_qrv;
1177                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1178                         if (mlh2->mld2q_nsrcs)
1179                                 return -EINVAL; /* no sources allowed */
1180
1181                         mld_gq_start_timer(idev);
1182                         return 0;
1183                 }
1184                 /* mark sources to include, if group & source-specific */
1185                 if (mlh2->mld2q_nsrcs != 0) {
1186                         if (!pskb_may_pull(skb, srcs_offset +
1187                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1188                                 return -EINVAL;
1189
1190                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1191                         mark = 1;
1192                 }
1193         } else
1194                 return -EINVAL;
1195
1196         read_lock_bh(&idev->lock);
1197         if (group_type == IPV6_ADDR_ANY) {
1198                 for (ma = idev->mc_list; ma; ma=ma->next) {
1199                         spin_lock_bh(&ma->mca_lock);
1200                         igmp6_group_queried(ma, max_delay);
1201                         spin_unlock_bh(&ma->mca_lock);
1202                 }
1203         } else {
1204                 for (ma = idev->mc_list; ma; ma=ma->next) {
1205                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1206                                 continue;
1207                         spin_lock_bh(&ma->mca_lock);
1208                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1209                                 /* gsquery <- gsquery && mark */
1210                                 if (!mark)
1211                                         ma->mca_flags &= ~MAF_GSQUERY;
1212                         } else {
1213                                 /* gsquery <- mark */
1214                                 if (mark)
1215                                         ma->mca_flags |= MAF_GSQUERY;
1216                                 else
1217                                         ma->mca_flags &= ~MAF_GSQUERY;
1218                         }
1219                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1220                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1221                                 igmp6_group_queried(ma, max_delay);
1222                         spin_unlock_bh(&ma->mca_lock);
1223                         break;
1224                 }
1225         }
1226         read_unlock_bh(&idev->lock);
1227
1228         return 0;
1229 }
1230
1231 /* called with rcu_read_lock() */
1232 int igmp6_event_report(struct sk_buff *skb)
1233 {
1234         struct ifmcaddr6 *ma;
1235         struct inet6_dev *idev;
1236         struct mld_msg *mld;
1237         int addr_type;
1238
1239         /* Our own report looped back. Ignore it. */
1240         if (skb->pkt_type == PACKET_LOOPBACK)
1241                 return 0;
1242
1243         /* send our report if the MC router may not have heard this report */
1244         if (skb->pkt_type != PACKET_MULTICAST &&
1245             skb->pkt_type != PACKET_BROADCAST)
1246                 return 0;
1247
1248         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1249                 return -EINVAL;
1250
1251         mld = (struct mld_msg *)icmp6_hdr(skb);
1252
1253         /* Drop reports with not link local source */
1254         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1255         if (addr_type != IPV6_ADDR_ANY &&
1256             !(addr_type&IPV6_ADDR_LINKLOCAL))
1257                 return -EINVAL;
1258
1259         idev = __in6_dev_get(skb->dev);
1260         if (idev == NULL)
1261                 return -ENODEV;
1262
1263         /*
1264          *      Cancel the timer for this group
1265          */
1266
1267         read_lock_bh(&idev->lock);
1268         for (ma = idev->mc_list; ma; ma=ma->next) {
1269                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1270                         spin_lock(&ma->mca_lock);
1271                         if (del_timer(&ma->mca_timer))
1272                                 atomic_dec(&ma->mca_refcnt);
1273                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1274                         spin_unlock(&ma->mca_lock);
1275                         break;
1276                 }
1277         }
1278         read_unlock_bh(&idev->lock);
1279         return 0;
1280 }
1281
1282 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1283                   int gdeleted, int sdeleted)
1284 {
1285         switch (type) {
1286         case MLD2_MODE_IS_INCLUDE:
1287         case MLD2_MODE_IS_EXCLUDE:
1288                 if (gdeleted || sdeleted)
1289                         return false;
1290                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1291                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1292                                 return true;
1293                         /* don't include if this source is excluded
1294                          * in all filters
1295                          */
1296                         if (psf->sf_count[MCAST_INCLUDE])
1297                                 return type == MLD2_MODE_IS_INCLUDE;
1298                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1299                                 psf->sf_count[MCAST_EXCLUDE];
1300                 }
1301                 return false;
1302         case MLD2_CHANGE_TO_INCLUDE:
1303                 if (gdeleted || sdeleted)
1304                         return false;
1305                 return psf->sf_count[MCAST_INCLUDE] != 0;
1306         case MLD2_CHANGE_TO_EXCLUDE:
1307                 if (gdeleted || sdeleted)
1308                         return false;
1309                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1310                     psf->sf_count[MCAST_INCLUDE])
1311                         return false;
1312                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1313                         psf->sf_count[MCAST_EXCLUDE];
1314         case MLD2_ALLOW_NEW_SOURCES:
1315                 if (gdeleted || !psf->sf_crcount)
1316                         return false;
1317                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1318         case MLD2_BLOCK_OLD_SOURCES:
1319                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1320                         return gdeleted || (psf->sf_crcount && sdeleted);
1321                 return psf->sf_crcount && !gdeleted && !sdeleted;
1322         }
1323         return false;
1324 }
1325
1326 static int
1327 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1328 {
1329         struct ip6_sf_list *psf;
1330         int scount = 0;
1331
1332         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1333                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1334                         continue;
1335                 scount++;
1336         }
1337         return scount;
1338 }
1339
1340 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1341                        struct net_device *dev,
1342                        const struct in6_addr *saddr,
1343                        const struct in6_addr *daddr,
1344                        int proto, int len)
1345 {
1346         struct ipv6hdr *hdr;
1347
1348         skb->protocol = htons(ETH_P_IPV6);
1349         skb->dev = dev;
1350
1351         skb_reset_network_header(skb);
1352         skb_put(skb, sizeof(struct ipv6hdr));
1353         hdr = ipv6_hdr(skb);
1354
1355         ip6_flow_hdr(hdr, 0, 0);
1356
1357         hdr->payload_len = htons(len);
1358         hdr->nexthdr = proto;
1359         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1360
1361         hdr->saddr = *saddr;
1362         hdr->daddr = *daddr;
1363 }
1364
1365 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1366 {
1367         struct net_device *dev = idev->dev;
1368         struct net *net = dev_net(dev);
1369         struct sock *sk = net->ipv6.igmp_sk;
1370         struct sk_buff *skb;
1371         struct mld2_report *pmr;
1372         struct in6_addr addr_buf;
1373         const struct in6_addr *saddr;
1374         int hlen = LL_RESERVED_SPACE(dev);
1375         int tlen = dev->needed_tailroom;
1376         int err;
1377         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1378                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1379                      IPV6_TLV_PADN, 0 };
1380
1381         /* we assume size > sizeof(ra) here */
1382         size += hlen + tlen;
1383         /* limit our allocations to order-0 page */
1384         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1385         skb = sock_alloc_send_skb(sk, size, 1, &err);
1386
1387         if (!skb)
1388                 return NULL;
1389
1390         skb->priority = TC_PRIO_CONTROL;
1391         skb_reserve(skb, hlen);
1392
1393         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1394                 /* <draft-ietf-magma-mld-source-05.txt>:
1395                  * use unspecified address as the source address
1396                  * when a valid link-local address is not available.
1397                  */
1398                 saddr = &in6addr_any;
1399         } else
1400                 saddr = &addr_buf;
1401
1402         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1403
1404         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1405
1406         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1407         skb_put(skb, sizeof(*pmr));
1408         pmr = (struct mld2_report *)skb_transport_header(skb);
1409         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1410         pmr->mld2r_resv1 = 0;
1411         pmr->mld2r_cksum = 0;
1412         pmr->mld2r_resv2 = 0;
1413         pmr->mld2r_ngrec = 0;
1414         return skb;
1415 }
1416
1417 static void mld_sendpack(struct sk_buff *skb)
1418 {
1419         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1420         struct mld2_report *pmr =
1421                               (struct mld2_report *)skb_transport_header(skb);
1422         int payload_len, mldlen;
1423         struct inet6_dev *idev;
1424         struct net *net = dev_net(skb->dev);
1425         int err;
1426         struct flowi6 fl6;
1427         struct dst_entry *dst;
1428
1429         rcu_read_lock();
1430         idev = __in6_dev_get(skb->dev);
1431         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1432
1433         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1434                 sizeof(*pip6);
1435         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1436         pip6->payload_len = htons(payload_len);
1437
1438         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1439                                            IPPROTO_ICMPV6,
1440                                            csum_partial(skb_transport_header(skb),
1441                                                         mldlen, 0));
1442
1443         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1444                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1445                          skb->dev->ifindex);
1446         dst = icmp6_dst_alloc(skb->dev, &fl6);
1447
1448         err = 0;
1449         if (IS_ERR(dst)) {
1450                 err = PTR_ERR(dst);
1451                 dst = NULL;
1452         }
1453         skb_dst_set(skb, dst);
1454         if (err)
1455                 goto err_out;
1456
1457         payload_len = skb->len;
1458
1459         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1460                       dst_output);
1461 out:
1462         if (!err) {
1463                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1464                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1465                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1466         } else
1467                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1468
1469         rcu_read_unlock();
1470         return;
1471
1472 err_out:
1473         kfree_skb(skb);
1474         goto out;
1475 }
1476
1477 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1478 {
1479         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1480 }
1481
1482 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1483         int type, struct mld2_grec **ppgr)
1484 {
1485         struct net_device *dev = pmc->idev->dev;
1486         struct mld2_report *pmr;
1487         struct mld2_grec *pgr;
1488
1489         if (!skb)
1490                 skb = mld_newpack(pmc->idev, dev->mtu);
1491         if (!skb)
1492                 return NULL;
1493         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1494         pgr->grec_type = type;
1495         pgr->grec_auxwords = 0;
1496         pgr->grec_nsrcs = 0;
1497         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1498         pmr = (struct mld2_report *)skb_transport_header(skb);
1499         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1500         *ppgr = pgr;
1501         return skb;
1502 }
1503
1504 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1505         skb_tailroom(skb)) : 0)
1506
1507 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1508         int type, int gdeleted, int sdeleted)
1509 {
1510         struct inet6_dev *idev = pmc->idev;
1511         struct net_device *dev = idev->dev;
1512         struct mld2_report *pmr;
1513         struct mld2_grec *pgr = NULL;
1514         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1515         int scount, stotal, first, isquery, truncate;
1516
1517         if (pmc->mca_flags & MAF_NOREPORT)
1518                 return skb;
1519
1520         isquery = type == MLD2_MODE_IS_INCLUDE ||
1521                   type == MLD2_MODE_IS_EXCLUDE;
1522         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1523                     type == MLD2_CHANGE_TO_EXCLUDE;
1524
1525         stotal = scount = 0;
1526
1527         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1528
1529         if (!*psf_list)
1530                 goto empty_source;
1531
1532         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1533
1534         /* EX and TO_EX get a fresh packet, if needed */
1535         if (truncate) {
1536                 if (pmr && pmr->mld2r_ngrec &&
1537                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1538                         if (skb)
1539                                 mld_sendpack(skb);
1540                         skb = mld_newpack(idev, dev->mtu);
1541                 }
1542         }
1543         first = 1;
1544         psf_prev = NULL;
1545         for (psf=*psf_list; psf; psf=psf_next) {
1546                 struct in6_addr *psrc;
1547
1548                 psf_next = psf->sf_next;
1549
1550                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1551                         psf_prev = psf;
1552                         continue;
1553                 }
1554
1555                 /* clear marks on query responses */
1556                 if (isquery)
1557                         psf->sf_gsresp = 0;
1558
1559                 if (AVAILABLE(skb) < sizeof(*psrc) +
1560                     first*sizeof(struct mld2_grec)) {
1561                         if (truncate && !first)
1562                                 break;   /* truncate these */
1563                         if (pgr)
1564                                 pgr->grec_nsrcs = htons(scount);
1565                         if (skb)
1566                                 mld_sendpack(skb);
1567                         skb = mld_newpack(idev, dev->mtu);
1568                         first = 1;
1569                         scount = 0;
1570                 }
1571                 if (first) {
1572                         skb = add_grhead(skb, pmc, type, &pgr);
1573                         first = 0;
1574                 }
1575                 if (!skb)
1576                         return NULL;
1577                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1578                 *psrc = psf->sf_addr;
1579                 scount++; stotal++;
1580                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1581                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1582                         psf->sf_crcount--;
1583                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1584                                 if (psf_prev)
1585                                         psf_prev->sf_next = psf->sf_next;
1586                                 else
1587                                         *psf_list = psf->sf_next;
1588                                 kfree(psf);
1589                                 continue;
1590                         }
1591                 }
1592                 psf_prev = psf;
1593         }
1594
1595 empty_source:
1596         if (!stotal) {
1597                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1598                     type == MLD2_BLOCK_OLD_SOURCES)
1599                         return skb;
1600                 if (pmc->mca_crcount || isquery) {
1601                         /* make sure we have room for group header */
1602                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1603                                 mld_sendpack(skb);
1604                                 skb = NULL; /* add_grhead will get a new one */
1605                         }
1606                         skb = add_grhead(skb, pmc, type, &pgr);
1607                 }
1608         }
1609         if (pgr)
1610                 pgr->grec_nsrcs = htons(scount);
1611
1612         if (isquery)
1613                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1614         return skb;
1615 }
1616
1617 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1618 {
1619         struct sk_buff *skb = NULL;
1620         int type;
1621
1622         read_lock_bh(&idev->lock);
1623         if (!pmc) {
1624                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1625                         if (pmc->mca_flags & MAF_NOREPORT)
1626                                 continue;
1627                         spin_lock_bh(&pmc->mca_lock);
1628                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1629                                 type = MLD2_MODE_IS_EXCLUDE;
1630                         else
1631                                 type = MLD2_MODE_IS_INCLUDE;
1632                         skb = add_grec(skb, pmc, type, 0, 0);
1633                         spin_unlock_bh(&pmc->mca_lock);
1634                 }
1635         } else {
1636                 spin_lock_bh(&pmc->mca_lock);
1637                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1638                         type = MLD2_MODE_IS_EXCLUDE;
1639                 else
1640                         type = MLD2_MODE_IS_INCLUDE;
1641                 skb = add_grec(skb, pmc, type, 0, 0);
1642                 spin_unlock_bh(&pmc->mca_lock);
1643         }
1644         read_unlock_bh(&idev->lock);
1645         if (skb)
1646                 mld_sendpack(skb);
1647 }
1648
1649 /*
1650  * remove zero-count source records from a source filter list
1651  */
1652 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1653 {
1654         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1655
1656         psf_prev = NULL;
1657         for (psf=*ppsf; psf; psf = psf_next) {
1658                 psf_next = psf->sf_next;
1659                 if (psf->sf_crcount == 0) {
1660                         if (psf_prev)
1661                                 psf_prev->sf_next = psf->sf_next;
1662                         else
1663                                 *ppsf = psf->sf_next;
1664                         kfree(psf);
1665                 } else
1666                         psf_prev = psf;
1667         }
1668 }
1669
1670 static void mld_send_cr(struct inet6_dev *idev)
1671 {
1672         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1673         struct sk_buff *skb = NULL;
1674         int type, dtype;
1675
1676         read_lock_bh(&idev->lock);
1677         spin_lock(&idev->mc_lock);
1678
1679         /* deleted MCA's */
1680         pmc_prev = NULL;
1681         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1682                 pmc_next = pmc->next;
1683                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1684                         type = MLD2_BLOCK_OLD_SOURCES;
1685                         dtype = MLD2_BLOCK_OLD_SOURCES;
1686                         skb = add_grec(skb, pmc, type, 1, 0);
1687                         skb = add_grec(skb, pmc, dtype, 1, 1);
1688                 }
1689                 if (pmc->mca_crcount) {
1690                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1691                                 type = MLD2_CHANGE_TO_INCLUDE;
1692                                 skb = add_grec(skb, pmc, type, 1, 0);
1693                         }
1694                         pmc->mca_crcount--;
1695                         if (pmc->mca_crcount == 0) {
1696                                 mld_clear_zeros(&pmc->mca_tomb);
1697                                 mld_clear_zeros(&pmc->mca_sources);
1698                         }
1699                 }
1700                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1701                     !pmc->mca_sources) {
1702                         if (pmc_prev)
1703                                 pmc_prev->next = pmc_next;
1704                         else
1705                                 idev->mc_tomb = pmc_next;
1706                         in6_dev_put(pmc->idev);
1707                         kfree(pmc);
1708                 } else
1709                         pmc_prev = pmc;
1710         }
1711         spin_unlock(&idev->mc_lock);
1712
1713         /* change recs */
1714         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1715                 spin_lock_bh(&pmc->mca_lock);
1716                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1717                         type = MLD2_BLOCK_OLD_SOURCES;
1718                         dtype = MLD2_ALLOW_NEW_SOURCES;
1719                 } else {
1720                         type = MLD2_ALLOW_NEW_SOURCES;
1721                         dtype = MLD2_BLOCK_OLD_SOURCES;
1722                 }
1723                 skb = add_grec(skb, pmc, type, 0, 0);
1724                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1725
1726                 /* filter mode changes */
1727                 if (pmc->mca_crcount) {
1728                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1729                                 type = MLD2_CHANGE_TO_EXCLUDE;
1730                         else
1731                                 type = MLD2_CHANGE_TO_INCLUDE;
1732                         skb = add_grec(skb, pmc, type, 0, 0);
1733                         pmc->mca_crcount--;
1734                 }
1735                 spin_unlock_bh(&pmc->mca_lock);
1736         }
1737         read_unlock_bh(&idev->lock);
1738         if (!skb)
1739                 return;
1740         (void) mld_sendpack(skb);
1741 }
1742
1743 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1744 {
1745         struct net *net = dev_net(dev);
1746         struct sock *sk = net->ipv6.igmp_sk;
1747         struct inet6_dev *idev;
1748         struct sk_buff *skb;
1749         struct mld_msg *hdr;
1750         const struct in6_addr *snd_addr, *saddr;
1751         struct in6_addr addr_buf;
1752         int hlen = LL_RESERVED_SPACE(dev);
1753         int tlen = dev->needed_tailroom;
1754         int err, len, payload_len, full_len;
1755         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1756                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1757                      IPV6_TLV_PADN, 0 };
1758         struct flowi6 fl6;
1759         struct dst_entry *dst;
1760
1761         if (type == ICMPV6_MGM_REDUCTION)
1762                 snd_addr = &in6addr_linklocal_allrouters;
1763         else
1764                 snd_addr = addr;
1765
1766         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1767         payload_len = len + sizeof(ra);
1768         full_len = sizeof(struct ipv6hdr) + payload_len;
1769
1770         rcu_read_lock();
1771         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1772                       IPSTATS_MIB_OUT, full_len);
1773         rcu_read_unlock();
1774
1775         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1776
1777         if (skb == NULL) {
1778                 rcu_read_lock();
1779                 IP6_INC_STATS(net, __in6_dev_get(dev),
1780                               IPSTATS_MIB_OUTDISCARDS);
1781                 rcu_read_unlock();
1782                 return;
1783         }
1784         skb->priority = TC_PRIO_CONTROL;
1785         skb_reserve(skb, hlen);
1786
1787         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1788                 /* <draft-ietf-magma-mld-source-05.txt>:
1789                  * use unspecified address as the source address
1790                  * when a valid link-local address is not available.
1791                  */
1792                 saddr = &in6addr_any;
1793         } else
1794                 saddr = &addr_buf;
1795
1796         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1797
1798         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1799
1800         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1801         memset(hdr, 0, sizeof(struct mld_msg));
1802         hdr->mld_type = type;
1803         hdr->mld_mca = *addr;
1804
1805         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1806                                          IPPROTO_ICMPV6,
1807                                          csum_partial(hdr, len, 0));
1808
1809         rcu_read_lock();
1810         idev = __in6_dev_get(skb->dev);
1811
1812         icmpv6_flow_init(sk, &fl6, type,
1813                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1814                          skb->dev->ifindex);
1815         dst = icmp6_dst_alloc(skb->dev, &fl6);
1816         if (IS_ERR(dst)) {
1817                 err = PTR_ERR(dst);
1818                 goto err_out;
1819         }
1820
1821         skb_dst_set(skb, dst);
1822         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1823                       dst_output);
1824 out:
1825         if (!err) {
1826                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1827                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1828                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1829         } else
1830                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1831
1832         rcu_read_unlock();
1833         return;
1834
1835 err_out:
1836         kfree_skb(skb);
1837         goto out;
1838 }
1839
1840 static void mld_resend_report(struct inet6_dev *idev)
1841 {
1842         if (MLD_V1_SEEN(idev)) {
1843                 struct ifmcaddr6 *mcaddr;
1844                 read_lock_bh(&idev->lock);
1845                 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1846                         if (!(mcaddr->mca_flags & MAF_NOREPORT))
1847                                 igmp6_send(&mcaddr->mca_addr, idev->dev,
1848                                            ICMPV6_MGM_REPORT);
1849                 }
1850                 read_unlock_bh(&idev->lock);
1851         } else {
1852                 mld_send_report(idev, NULL);
1853         }
1854 }
1855
1856 void ipv6_mc_dad_complete(struct inet6_dev *idev)
1857 {
1858         idev->mc_dad_count = idev->mc_qrv;
1859         if (idev->mc_dad_count) {
1860                 mld_resend_report(idev);
1861                 idev->mc_dad_count--;
1862                 if (idev->mc_dad_count)
1863                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1864         }
1865 }
1866
1867 static void mld_dad_timer_expire(unsigned long data)
1868 {
1869         struct inet6_dev *idev = (struct inet6_dev *)data;
1870
1871         mld_resend_report(idev);
1872         if (idev->mc_dad_count) {
1873                 idev->mc_dad_count--;
1874                 if (idev->mc_dad_count)
1875                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1876         }
1877         __in6_dev_put(idev);
1878 }
1879
1880 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1881         const struct in6_addr *psfsrc)
1882 {
1883         struct ip6_sf_list *psf, *psf_prev;
1884         int rv = 0;
1885
1886         psf_prev = NULL;
1887         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1888                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1889                         break;
1890                 psf_prev = psf;
1891         }
1892         if (!psf || psf->sf_count[sfmode] == 0) {
1893                 /* source filter not found, or count wrong =>  bug */
1894                 return -ESRCH;
1895         }
1896         psf->sf_count[sfmode]--;
1897         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1898                 struct inet6_dev *idev = pmc->idev;
1899
1900                 /* no more filters for this source */
1901                 if (psf_prev)
1902                         psf_prev->sf_next = psf->sf_next;
1903                 else
1904                         pmc->mca_sources = psf->sf_next;
1905                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1906                     !MLD_V1_SEEN(idev)) {
1907                         psf->sf_crcount = idev->mc_qrv;
1908                         psf->sf_next = pmc->mca_tomb;
1909                         pmc->mca_tomb = psf;
1910                         rv = 1;
1911                 } else
1912                         kfree(psf);
1913         }
1914         return rv;
1915 }
1916
1917 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1918                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1919                           int delta)
1920 {
1921         struct ifmcaddr6 *pmc;
1922         int     changerec = 0;
1923         int     i, err;
1924
1925         if (!idev)
1926                 return -ENODEV;
1927         read_lock_bh(&idev->lock);
1928         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1929                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1930                         break;
1931         }
1932         if (!pmc) {
1933                 /* MCA not found?? bug */
1934                 read_unlock_bh(&idev->lock);
1935                 return -ESRCH;
1936         }
1937         spin_lock_bh(&pmc->mca_lock);
1938         sf_markstate(pmc);
1939         if (!delta) {
1940                 if (!pmc->mca_sfcount[sfmode]) {
1941                         spin_unlock_bh(&pmc->mca_lock);
1942                         read_unlock_bh(&idev->lock);
1943                         return -EINVAL;
1944                 }
1945                 pmc->mca_sfcount[sfmode]--;
1946         }
1947         err = 0;
1948         for (i=0; i<sfcount; i++) {
1949                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1950
1951                 changerec |= rv > 0;
1952                 if (!err && rv < 0)
1953                         err = rv;
1954         }
1955         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1956             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1957             pmc->mca_sfcount[MCAST_INCLUDE]) {
1958                 struct ip6_sf_list *psf;
1959
1960                 /* filter mode change */
1961                 pmc->mca_sfmode = MCAST_INCLUDE;
1962                 pmc->mca_crcount = idev->mc_qrv;
1963                 idev->mc_ifc_count = pmc->mca_crcount;
1964                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1965                         psf->sf_crcount = 0;
1966                 mld_ifc_event(pmc->idev);
1967         } else if (sf_setstate(pmc) || changerec)
1968                 mld_ifc_event(pmc->idev);
1969         spin_unlock_bh(&pmc->mca_lock);
1970         read_unlock_bh(&idev->lock);
1971         return err;
1972 }
1973
1974 /*
1975  * Add multicast single-source filter to the interface list
1976  */
1977 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1978         const struct in6_addr *psfsrc)
1979 {
1980         struct ip6_sf_list *psf, *psf_prev;
1981
1982         psf_prev = NULL;
1983         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1984                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1985                         break;
1986                 psf_prev = psf;
1987         }
1988         if (!psf) {
1989                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1990                 if (!psf)
1991                         return -ENOBUFS;
1992
1993                 psf->sf_addr = *psfsrc;
1994                 if (psf_prev) {
1995                         psf_prev->sf_next = psf;
1996                 } else
1997                         pmc->mca_sources = psf;
1998         }
1999         psf->sf_count[sfmode]++;
2000         return 0;
2001 }
2002
2003 static void sf_markstate(struct ifmcaddr6 *pmc)
2004 {
2005         struct ip6_sf_list *psf;
2006         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2007
2008         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2009                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2010                         psf->sf_oldin = mca_xcount ==
2011                                 psf->sf_count[MCAST_EXCLUDE] &&
2012                                 !psf->sf_count[MCAST_INCLUDE];
2013                 } else
2014                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2015 }
2016
2017 static int sf_setstate(struct ifmcaddr6 *pmc)
2018 {
2019         struct ip6_sf_list *psf, *dpsf;
2020         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2021         int qrv = pmc->idev->mc_qrv;
2022         int new_in, rv;
2023
2024         rv = 0;
2025         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2026                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2027                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2028                                 !psf->sf_count[MCAST_INCLUDE];
2029                 } else
2030                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2031                 if (new_in) {
2032                         if (!psf->sf_oldin) {
2033                                 struct ip6_sf_list *prev = NULL;
2034
2035                                 for (dpsf=pmc->mca_tomb; dpsf;
2036                                      dpsf=dpsf->sf_next) {
2037                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2038                                             &psf->sf_addr))
2039                                                 break;
2040                                         prev = dpsf;
2041                                 }
2042                                 if (dpsf) {
2043                                         if (prev)
2044                                                 prev->sf_next = dpsf->sf_next;
2045                                         else
2046                                                 pmc->mca_tomb = dpsf->sf_next;
2047                                         kfree(dpsf);
2048                                 }
2049                                 psf->sf_crcount = qrv;
2050                                 rv++;
2051                         }
2052                 } else if (psf->sf_oldin) {
2053                         psf->sf_crcount = 0;
2054                         /*
2055                          * add or update "delete" records if an active filter
2056                          * is now inactive
2057                          */
2058                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2059                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2060                                     &psf->sf_addr))
2061                                         break;
2062                         if (!dpsf) {
2063                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2064                                 if (!dpsf)
2065                                         continue;
2066                                 *dpsf = *psf;
2067                                 /* pmc->mca_lock held by callers */
2068                                 dpsf->sf_next = pmc->mca_tomb;
2069                                 pmc->mca_tomb = dpsf;
2070                         }
2071                         dpsf->sf_crcount = qrv;
2072                         rv++;
2073                 }
2074         }
2075         return rv;
2076 }
2077
2078 /*
2079  * Add multicast source filter list to the interface list
2080  */
2081 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2082                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2083                           int delta)
2084 {
2085         struct ifmcaddr6 *pmc;
2086         int     isexclude;
2087         int     i, err;
2088
2089         if (!idev)
2090                 return -ENODEV;
2091         read_lock_bh(&idev->lock);
2092         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2093                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2094                         break;
2095         }
2096         if (!pmc) {
2097                 /* MCA not found?? bug */
2098                 read_unlock_bh(&idev->lock);
2099                 return -ESRCH;
2100         }
2101         spin_lock_bh(&pmc->mca_lock);
2102
2103         sf_markstate(pmc);
2104         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2105         if (!delta)
2106                 pmc->mca_sfcount[sfmode]++;
2107         err = 0;
2108         for (i=0; i<sfcount; i++) {
2109                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2110                 if (err)
2111                         break;
2112         }
2113         if (err) {
2114                 int j;
2115
2116                 if (!delta)
2117                         pmc->mca_sfcount[sfmode]--;
2118                 for (j=0; j<i; j++)
2119                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2120         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2121                 struct ip6_sf_list *psf;
2122
2123                 /* filter mode change */
2124                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2125                         pmc->mca_sfmode = MCAST_EXCLUDE;
2126                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2127                         pmc->mca_sfmode = MCAST_INCLUDE;
2128                 /* else no filters; keep old mode for reports */
2129
2130                 pmc->mca_crcount = idev->mc_qrv;
2131                 idev->mc_ifc_count = pmc->mca_crcount;
2132                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2133                         psf->sf_crcount = 0;
2134                 mld_ifc_event(idev);
2135         } else if (sf_setstate(pmc))
2136                 mld_ifc_event(idev);
2137         spin_unlock_bh(&pmc->mca_lock);
2138         read_unlock_bh(&idev->lock);
2139         return err;
2140 }
2141
2142 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2143 {
2144         struct ip6_sf_list *psf, *nextpsf;
2145
2146         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2147                 nextpsf = psf->sf_next;
2148                 kfree(psf);
2149         }
2150         pmc->mca_tomb = NULL;
2151         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2152                 nextpsf = psf->sf_next;
2153                 kfree(psf);
2154         }
2155         pmc->mca_sources = NULL;
2156         pmc->mca_sfmode = MCAST_EXCLUDE;
2157         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2158         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2159 }
2160
2161
2162 static void igmp6_join_group(struct ifmcaddr6 *ma)
2163 {
2164         unsigned long delay;
2165
2166         if (ma->mca_flags & MAF_NOREPORT)
2167                 return;
2168
2169         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2170
2171         delay = net_random() % unsolicited_report_interval(ma->idev);
2172
2173         spin_lock_bh(&ma->mca_lock);
2174         if (del_timer(&ma->mca_timer)) {
2175                 atomic_dec(&ma->mca_refcnt);
2176                 delay = ma->mca_timer.expires - jiffies;
2177         }
2178
2179         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2180                 atomic_inc(&ma->mca_refcnt);
2181         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2182         spin_unlock_bh(&ma->mca_lock);
2183 }
2184
2185 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2186                             struct inet6_dev *idev)
2187 {
2188         int err;
2189
2190         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2191          * so no other readers or writers of iml or its sflist
2192          */
2193         if (!iml->sflist) {
2194                 /* any-source empty exclude case */
2195                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2196         }
2197         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2198                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2199         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2200         iml->sflist = NULL;
2201         return err;
2202 }
2203
2204 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2205 {
2206         if (MLD_V1_SEEN(ma->idev)) {
2207                 if (ma->mca_flags & MAF_LAST_REPORTER)
2208                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2209                                 ICMPV6_MGM_REDUCTION);
2210         } else {
2211                 mld_add_delrec(ma->idev, ma);
2212                 mld_ifc_event(ma->idev);
2213         }
2214 }
2215
2216 static void mld_gq_timer_expire(unsigned long data)
2217 {
2218         struct inet6_dev *idev = (struct inet6_dev *)data;
2219
2220         idev->mc_gq_running = 0;
2221         mld_send_report(idev, NULL);
2222         __in6_dev_put(idev);
2223 }
2224
2225 static void mld_ifc_timer_expire(unsigned long data)
2226 {
2227         struct inet6_dev *idev = (struct inet6_dev *)data;
2228
2229         mld_send_cr(idev);
2230         if (idev->mc_ifc_count) {
2231                 idev->mc_ifc_count--;
2232                 if (idev->mc_ifc_count)
2233                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2234         }
2235         __in6_dev_put(idev);
2236 }
2237
2238 static void mld_ifc_event(struct inet6_dev *idev)
2239 {
2240         if (MLD_V1_SEEN(idev))
2241                 return;
2242         idev->mc_ifc_count = idev->mc_qrv;
2243         mld_ifc_start_timer(idev, 1);
2244 }
2245
2246
2247 static void igmp6_timer_handler(unsigned long data)
2248 {
2249         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2250
2251         if (MLD_V1_SEEN(ma->idev))
2252                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2253         else
2254                 mld_send_report(ma->idev, ma);
2255
2256         spin_lock(&ma->mca_lock);
2257         ma->mca_flags |=  MAF_LAST_REPORTER;
2258         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2259         spin_unlock(&ma->mca_lock);
2260         ma_put(ma);
2261 }
2262
2263 /* Device changing type */
2264
2265 void ipv6_mc_unmap(struct inet6_dev *idev)
2266 {
2267         struct ifmcaddr6 *i;
2268
2269         /* Install multicast list, except for all-nodes (already installed) */
2270
2271         read_lock_bh(&idev->lock);
2272         for (i = idev->mc_list; i; i = i->next)
2273                 igmp6_group_dropped(i);
2274         read_unlock_bh(&idev->lock);
2275 }
2276
2277 void ipv6_mc_remap(struct inet6_dev *idev)
2278 {
2279         ipv6_mc_up(idev);
2280 }
2281
2282 /* Device going down */
2283
2284 void ipv6_mc_down(struct inet6_dev *idev)
2285 {
2286         struct ifmcaddr6 *i;
2287
2288         /* Withdraw multicast list */
2289
2290         read_lock_bh(&idev->lock);
2291         idev->mc_ifc_count = 0;
2292         if (del_timer(&idev->mc_ifc_timer))
2293                 __in6_dev_put(idev);
2294         idev->mc_gq_running = 0;
2295         if (del_timer(&idev->mc_gq_timer))
2296                 __in6_dev_put(idev);
2297         if (del_timer(&idev->mc_dad_timer))
2298                 __in6_dev_put(idev);
2299
2300         for (i = idev->mc_list; i; i=i->next)
2301                 igmp6_group_dropped(i);
2302         read_unlock_bh(&idev->lock);
2303
2304         mld_clear_delrec(idev);
2305 }
2306
2307
2308 /* Device going up */
2309
2310 void ipv6_mc_up(struct inet6_dev *idev)
2311 {
2312         struct ifmcaddr6 *i;
2313
2314         /* Install multicast list, except for all-nodes (already installed) */
2315
2316         read_lock_bh(&idev->lock);
2317         for (i = idev->mc_list; i; i=i->next)
2318                 igmp6_group_added(i);
2319         read_unlock_bh(&idev->lock);
2320 }
2321
2322 /* IPv6 device initialization. */
2323
2324 void ipv6_mc_init_dev(struct inet6_dev *idev)
2325 {
2326         write_lock_bh(&idev->lock);
2327         spin_lock_init(&idev->mc_lock);
2328         idev->mc_gq_running = 0;
2329         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2330                         (unsigned long)idev);
2331         idev->mc_tomb = NULL;
2332         idev->mc_ifc_count = 0;
2333         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2334                         (unsigned long)idev);
2335         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2336                     (unsigned long)idev);
2337         idev->mc_qrv = MLD_QRV_DEFAULT;
2338         idev->mc_maxdelay = unsolicited_report_interval(idev);
2339         idev->mc_v1_seen = 0;
2340         write_unlock_bh(&idev->lock);
2341 }
2342
2343 /*
2344  *      Device is about to be destroyed: clean up.
2345  */
2346
2347 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2348 {
2349         struct ifmcaddr6 *i;
2350
2351         /* Deactivate timers */
2352         ipv6_mc_down(idev);
2353
2354         /* Delete all-nodes address. */
2355         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2356          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2357          * fail.
2358          */
2359         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2360
2361         if (idev->cnf.forwarding)
2362                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2363
2364         write_lock_bh(&idev->lock);
2365         while ((i = idev->mc_list) != NULL) {
2366                 idev->mc_list = i->next;
2367                 write_unlock_bh(&idev->lock);
2368
2369                 igmp6_group_dropped(i);
2370                 ma_put(i);
2371
2372                 write_lock_bh(&idev->lock);
2373         }
2374         write_unlock_bh(&idev->lock);
2375 }
2376
2377 #ifdef CONFIG_PROC_FS
2378 struct igmp6_mc_iter_state {
2379         struct seq_net_private p;
2380         struct net_device *dev;
2381         struct inet6_dev *idev;
2382 };
2383
2384 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2385
2386 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2387 {
2388         struct ifmcaddr6 *im = NULL;
2389         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2390         struct net *net = seq_file_net(seq);
2391
2392         state->idev = NULL;
2393         for_each_netdev_rcu(net, state->dev) {
2394                 struct inet6_dev *idev;
2395                 idev = __in6_dev_get(state->dev);
2396                 if (!idev)
2397                         continue;
2398                 read_lock_bh(&idev->lock);
2399                 im = idev->mc_list;
2400                 if (im) {
2401                         state->idev = idev;
2402                         break;
2403                 }
2404                 read_unlock_bh(&idev->lock);
2405         }
2406         return im;
2407 }
2408
2409 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2410 {
2411         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2412
2413         im = im->next;
2414         while (!im) {
2415                 if (likely(state->idev != NULL))
2416                         read_unlock_bh(&state->idev->lock);
2417
2418                 state->dev = next_net_device_rcu(state->dev);
2419                 if (!state->dev) {
2420                         state->idev = NULL;
2421                         break;
2422                 }
2423                 state->idev = __in6_dev_get(state->dev);
2424                 if (!state->idev)
2425                         continue;
2426                 read_lock_bh(&state->idev->lock);
2427                 im = state->idev->mc_list;
2428         }
2429         return im;
2430 }
2431
2432 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2433 {
2434         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2435         if (im)
2436                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2437                         --pos;
2438         return pos ? NULL : im;
2439 }
2440
2441 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2442         __acquires(RCU)
2443 {
2444         rcu_read_lock();
2445         return igmp6_mc_get_idx(seq, *pos);
2446 }
2447
2448 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2449 {
2450         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2451
2452         ++*pos;
2453         return im;
2454 }
2455
2456 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2457         __releases(RCU)
2458 {
2459         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2460
2461         if (likely(state->idev != NULL)) {
2462                 read_unlock_bh(&state->idev->lock);
2463                 state->idev = NULL;
2464         }
2465         state->dev = NULL;
2466         rcu_read_unlock();
2467 }
2468
2469 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2470 {
2471         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2472         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2473
2474         seq_printf(seq,
2475                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2476                    state->dev->ifindex, state->dev->name,
2477                    &im->mca_addr,
2478                    im->mca_users, im->mca_flags,
2479                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2480                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2481         return 0;
2482 }
2483
2484 static const struct seq_operations igmp6_mc_seq_ops = {
2485         .start  =       igmp6_mc_seq_start,
2486         .next   =       igmp6_mc_seq_next,
2487         .stop   =       igmp6_mc_seq_stop,
2488         .show   =       igmp6_mc_seq_show,
2489 };
2490
2491 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2492 {
2493         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2494                             sizeof(struct igmp6_mc_iter_state));
2495 }
2496
2497 static const struct file_operations igmp6_mc_seq_fops = {
2498         .owner          =       THIS_MODULE,
2499         .open           =       igmp6_mc_seq_open,
2500         .read           =       seq_read,
2501         .llseek         =       seq_lseek,
2502         .release        =       seq_release_net,
2503 };
2504
2505 struct igmp6_mcf_iter_state {
2506         struct seq_net_private p;
2507         struct net_device *dev;
2508         struct inet6_dev *idev;
2509         struct ifmcaddr6 *im;
2510 };
2511
2512 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2513
2514 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2515 {
2516         struct ip6_sf_list *psf = NULL;
2517         struct ifmcaddr6 *im = NULL;
2518         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2519         struct net *net = seq_file_net(seq);
2520
2521         state->idev = NULL;
2522         state->im = NULL;
2523         for_each_netdev_rcu(net, state->dev) {
2524                 struct inet6_dev *idev;
2525                 idev = __in6_dev_get(state->dev);
2526                 if (unlikely(idev == NULL))
2527                         continue;
2528                 read_lock_bh(&idev->lock);
2529                 im = idev->mc_list;
2530                 if (likely(im != NULL)) {
2531                         spin_lock_bh(&im->mca_lock);
2532                         psf = im->mca_sources;
2533                         if (likely(psf != NULL)) {
2534                                 state->im = im;
2535                                 state->idev = idev;
2536                                 break;
2537                         }
2538                         spin_unlock_bh(&im->mca_lock);
2539                 }
2540                 read_unlock_bh(&idev->lock);
2541         }
2542         return psf;
2543 }
2544
2545 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2546 {
2547         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2548
2549         psf = psf->sf_next;
2550         while (!psf) {
2551                 spin_unlock_bh(&state->im->mca_lock);
2552                 state->im = state->im->next;
2553                 while (!state->im) {
2554                         if (likely(state->idev != NULL))
2555                                 read_unlock_bh(&state->idev->lock);
2556
2557                         state->dev = next_net_device_rcu(state->dev);
2558                         if (!state->dev) {
2559                                 state->idev = NULL;
2560                                 goto out;
2561                         }
2562                         state->idev = __in6_dev_get(state->dev);
2563                         if (!state->idev)
2564                                 continue;
2565                         read_lock_bh(&state->idev->lock);
2566                         state->im = state->idev->mc_list;
2567                 }
2568                 if (!state->im)
2569                         break;
2570                 spin_lock_bh(&state->im->mca_lock);
2571                 psf = state->im->mca_sources;
2572         }
2573 out:
2574         return psf;
2575 }
2576
2577 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2578 {
2579         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2580         if (psf)
2581                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2582                         --pos;
2583         return pos ? NULL : psf;
2584 }
2585
2586 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2587         __acquires(RCU)
2588 {
2589         rcu_read_lock();
2590         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2591 }
2592
2593 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2594 {
2595         struct ip6_sf_list *psf;
2596         if (v == SEQ_START_TOKEN)
2597                 psf = igmp6_mcf_get_first(seq);
2598         else
2599                 psf = igmp6_mcf_get_next(seq, v);
2600         ++*pos;
2601         return psf;
2602 }
2603
2604 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2605         __releases(RCU)
2606 {
2607         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2608         if (likely(state->im != NULL)) {
2609                 spin_unlock_bh(&state->im->mca_lock);
2610                 state->im = NULL;
2611         }
2612         if (likely(state->idev != NULL)) {
2613                 read_unlock_bh(&state->idev->lock);
2614                 state->idev = NULL;
2615         }
2616         state->dev = NULL;
2617         rcu_read_unlock();
2618 }
2619
2620 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2621 {
2622         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2623         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2624
2625         if (v == SEQ_START_TOKEN) {
2626                 seq_printf(seq,
2627                            "%3s %6s "
2628                            "%32s %32s %6s %6s\n", "Idx",
2629                            "Device", "Multicast Address",
2630                            "Source Address", "INC", "EXC");
2631         } else {
2632                 seq_printf(seq,
2633                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2634                            state->dev->ifindex, state->dev->name,
2635                            &state->im->mca_addr,
2636                            &psf->sf_addr,
2637                            psf->sf_count[MCAST_INCLUDE],
2638                            psf->sf_count[MCAST_EXCLUDE]);
2639         }
2640         return 0;
2641 }
2642
2643 static const struct seq_operations igmp6_mcf_seq_ops = {
2644         .start  =       igmp6_mcf_seq_start,
2645         .next   =       igmp6_mcf_seq_next,
2646         .stop   =       igmp6_mcf_seq_stop,
2647         .show   =       igmp6_mcf_seq_show,
2648 };
2649
2650 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2651 {
2652         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2653                             sizeof(struct igmp6_mcf_iter_state));
2654 }
2655
2656 static const struct file_operations igmp6_mcf_seq_fops = {
2657         .owner          =       THIS_MODULE,
2658         .open           =       igmp6_mcf_seq_open,
2659         .read           =       seq_read,
2660         .llseek         =       seq_lseek,
2661         .release        =       seq_release_net,
2662 };
2663
2664 static int __net_init igmp6_proc_init(struct net *net)
2665 {
2666         int err;
2667
2668         err = -ENOMEM;
2669         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2670                 goto out;
2671         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2672                          &igmp6_mcf_seq_fops))
2673                 goto out_proc_net_igmp6;
2674
2675         err = 0;
2676 out:
2677         return err;
2678
2679 out_proc_net_igmp6:
2680         remove_proc_entry("igmp6", net->proc_net);
2681         goto out;
2682 }
2683
2684 static void __net_exit igmp6_proc_exit(struct net *net)
2685 {
2686         remove_proc_entry("mcfilter6", net->proc_net);
2687         remove_proc_entry("igmp6", net->proc_net);
2688 }
2689 #else
2690 static inline int igmp6_proc_init(struct net *net)
2691 {
2692         return 0;
2693 }
2694 static inline void igmp6_proc_exit(struct net *net)
2695 {
2696 }
2697 #endif
2698
2699 static int __net_init igmp6_net_init(struct net *net)
2700 {
2701         int err;
2702
2703         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2704                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2705         if (err < 0) {
2706                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2707                        err);
2708                 goto out;
2709         }
2710
2711         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2712
2713         err = igmp6_proc_init(net);
2714         if (err)
2715                 goto out_sock_create;
2716 out:
2717         return err;
2718
2719 out_sock_create:
2720         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2721         goto out;
2722 }
2723
2724 static void __net_exit igmp6_net_exit(struct net *net)
2725 {
2726         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2727         igmp6_proc_exit(net);
2728 }
2729
2730 static struct pernet_operations igmp6_net_ops = {
2731         .init = igmp6_net_init,
2732         .exit = igmp6_net_exit,
2733 };
2734
2735 int __init igmp6_init(void)
2736 {
2737         return register_pernet_subsys(&igmp6_net_ops);
2738 }
2739
2740 void igmp6_cleanup(void)
2741 {
2742         unregister_pernet_subsys(&igmp6_net_ops);
2743 }