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 <net/mld.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/net_namespace.h>
  53 #include <net/sock.h>
  54 #include <net/snmp.h>
  55
  56 #include <net/ipv6.h>
  57 #include <net/protocol.h>
  58 #include <net/if_inet6.h>
  59 #include <net/ndisc.h>
  60 #include <net/addrconf.h>
  61 #include <net/ip6_route.h>
  62 #include <net/inet_common.h>
  63
  64 #include <net/ip6_checksum.h>
  65
  66 /* Set to 3 to get tracing... */
  67 #define MCAST_DEBUG 2
  68
  69 #if MCAST_DEBUG >= 3
  70 #define MDBG(x) printk x
  71 #else
  72 #define MDBG(x)
  73 #endif
  74
  75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  77         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  80 };
  81
  82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84 /* Big mc list lock for all the sockets */
  85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  86
  87 static void igmp6_join_group(struct ifmcaddr6 *ma);
  88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89 static void igmp6_timer_handler(unsigned long data);
  90
  91 static void mld_gq_timer_expire(unsigned long data);
  92 static void mld_ifc_timer_expire(unsigned long data);
  93 static void mld_ifc_event(struct inet6_dev *idev);
  94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  96 static void mld_clear_delrec(struct inet6_dev *idev);
  97 static int sf_setstate(struct ifmcaddr6 *pmc);
  98 static void sf_markstate(struct ifmcaddr6 *pmc);
  99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 101                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 102                           int delta);
 103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 104                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 105                           int delta);
 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 107                             struct inet6_dev *idev);
 108
 109
 110 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 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 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 132 {
 133         struct net_device *dev = NULL;
 134         struct ipv6_mc_socklist *mc_lst;
 135         struct ipv6_pinfo *np = inet6_sk(sk);
 136         struct net *net = sock_net(sk);
 137         int err;
 138
 139         if (!ipv6_addr_is_multicast(addr))
 140                 return -EINVAL;
 141
 142         rcu_read_lock();
 143         for_each_pmc_rcu(np, mc_lst) {
 144                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 145                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 146                         rcu_read_unlock();
 147                         return -EADDRINUSE;
 148                 }
 149         }
 150         rcu_read_unlock();
 151
 152         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 153
 154         if (mc_lst == NULL)
 155                 return -ENOMEM;
 156
 157         mc_lst->next = NULL;
 158         mc_lst->addr = *addr;
 159
 160         rcu_read_lock();
 161         if (ifindex == 0) {
 162                 struct rt6_info *rt;
 163                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 164                 if (rt) {
 165                         dev = rt->dst.dev;
 166                         ip6_rt_put(rt);
 167                 }
 168         } else
 169                 dev = dev_get_by_index_rcu(net, ifindex);
 170
 171         if (dev == NULL) {
 172                 rcu_read_unlock();
 173                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 174                 return -ENODEV;
 175         }
 176
 177         mc_lst->ifindex = dev->ifindex;
 178         mc_lst->sfmode = MCAST_EXCLUDE;
 179         rwlock_init(&mc_lst->sflock);
 180         mc_lst->sflist = NULL;
 181
 182         /*
 183          *      now add/increase the group membership on the device
 184          */
 185
 186         err = ipv6_dev_mc_inc(dev, addr);
 187
 188         if (err) {
 189                 rcu_read_unlock();
 190                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 191                 return err;
 192         }
 193
 194         spin_lock(&ipv6_sk_mc_lock);
 195         mc_lst->next = np->ipv6_mc_list;
 196         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 197         spin_unlock(&ipv6_sk_mc_lock);
 198
 199         rcu_read_unlock();
 200
 201         return 0;
 202 }
 203
 204 /*
 205  *      socket leave on multicast group
 206  */
 207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 208 {
 209         struct ipv6_pinfo *np = inet6_sk(sk);
 210         struct ipv6_mc_socklist *mc_lst;
 211         struct ipv6_mc_socklist __rcu **lnk;
 212         struct net *net = sock_net(sk);
 213
 214         if (!ipv6_addr_is_multicast(addr))
 215                 return -EINVAL;
 216
 217         spin_lock(&ipv6_sk_mc_lock);
 218         for (lnk = &np->ipv6_mc_list;
 219              (mc_lst = rcu_dereference_protected(*lnk,
 220                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 221               lnk = &mc_lst->next) {
 222                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 223                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 224                         struct net_device *dev;
 225
 226                         *lnk = mc_lst->next;
 227                         spin_unlock(&ipv6_sk_mc_lock);
 228
 229                         rcu_read_lock();
 230                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 231                         if (dev != NULL) {
 232                                 struct inet6_dev *idev = __in6_dev_get(dev);
 233
 234                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 235                                 if (idev)
 236                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 237                         } else
 238                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 239                         rcu_read_unlock();
 240                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 241                         kfree_rcu(mc_lst, rcu);
 242                         return 0;
 243                 }
 244         }
 245         spin_unlock(&ipv6_sk_mc_lock);
 246
 247         return -EADDRNOTAVAIL;
 248 }
 249
 250 /* called with rcu_read_lock() */
 251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 252                                              const struct in6_addr *group,
 253                                              int ifindex)
 254 {
 255         struct net_device *dev = NULL;
 256         struct inet6_dev *idev = NULL;
 257
 258         if (ifindex == 0) {
 259                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 260
 261                 if (rt) {
 262                         dev = rt->dst.dev;
 263                         ip6_rt_put(rt);
 264                 }
 265         } else
 266                 dev = dev_get_by_index_rcu(net, ifindex);
 267
 268         if (!dev)
 269                 return NULL;
 270         idev = __in6_dev_get(dev);
 271         if (!idev)
 272                 return NULL;
 273         read_lock_bh(&idev->lock);
 274         if (idev->dead) {
 275                 read_unlock_bh(&idev->lock);
 276                 return NULL;
 277         }
 278         return idev;
 279 }
 280
 281 void ipv6_sock_mc_close(struct sock *sk)
 282 {
 283         struct ipv6_pinfo *np = inet6_sk(sk);
 284         struct ipv6_mc_socklist *mc_lst;
 285         struct net *net = sock_net(sk);
 286
 287         if (!rcu_access_pointer(np->ipv6_mc_list))
 288                 return;
 289
 290         spin_lock(&ipv6_sk_mc_lock);
 291         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 292                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 293                 struct net_device *dev;
 294
 295                 np->ipv6_mc_list = mc_lst->next;
 296                 spin_unlock(&ipv6_sk_mc_lock);
 297
 298                 rcu_read_lock();
 299                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 300                 if (dev) {
 301                         struct inet6_dev *idev = __in6_dev_get(dev);
 302
 303                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 304                         if (idev)
 305                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 306                 } else
 307                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 308                 rcu_read_unlock();
 309
 310                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 311                 kfree_rcu(mc_lst, rcu);
 312
 313                 spin_lock(&ipv6_sk_mc_lock);
 314         }
 315         spin_unlock(&ipv6_sk_mc_lock);
 316 }
 317
 318 int ip6_mc_source(int add, int omode, struct sock *sk,
 319         struct group_source_req *pgsr)
 320 {
 321         struct in6_addr *source, *group;
 322         struct ipv6_mc_socklist *pmc;
 323         struct inet6_dev *idev;
 324         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 325         struct ip6_sf_socklist *psl;
 326         struct net *net = sock_net(sk);
 327         int i, j, rv;
 328         int leavegroup = 0;
 329         int pmclocked = 0;
 330         int err;
 331
 332         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 333         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 334
 335         if (!ipv6_addr_is_multicast(group))
 336                 return -EINVAL;
 337
 338         rcu_read_lock();
 339         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 340         if (!idev) {
 341                 rcu_read_unlock();
 342                 return -ENODEV;
 343         }
 344
 345         err = -EADDRNOTAVAIL;
 346
 347         for_each_pmc_rcu(inet6, pmc) {
 348                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 349                         continue;
 350                 if (ipv6_addr_equal(&pmc->addr, group))
 351                         break;
 352         }
 353         if (!pmc) {             /* must have a prior join */
 354                 err = -EINVAL;
 355                 goto done;
 356         }
 357         /* if a source filter was set, must be the same mode as before */
 358         if (pmc->sflist) {
 359                 if (pmc->sfmode != omode) {
 360                         err = -EINVAL;
 361                         goto done;
 362                 }
 363         } else if (pmc->sfmode != omode) {
 364                 /* allow mode switches for empty-set filters */
 365                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 366                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 367                 pmc->sfmode = omode;
 368         }
 369
 370         write_lock(&pmc->sflock);
 371         pmclocked = 1;
 372
 373         psl = pmc->sflist;
 374         if (!add) {
 375                 if (!psl)
 376                         goto done;      /* err = -EADDRNOTAVAIL */
 377                 rv = !0;
 378                 for (i=0; i<psl->sl_count; i++) {
 379                         rv = memcmp(&psl->sl_addr[i], source,
 380                                 sizeof(struct in6_addr));
 381                         if (rv == 0)
 382                                 break;
 383                 }
 384                 if (rv)         /* source not found */
 385                         goto done;      /* err = -EADDRNOTAVAIL */
 386
 387                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 388                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 389                         leavegroup = 1;
 390                         goto done;
 391                 }
 392
 393                 /* update the interface filter */
 394                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 395
 396                 for (j=i+1; j<psl->sl_count; j++)
 397                         psl->sl_addr[j-1] = psl->sl_addr[j];
 398                 psl->sl_count--;
 399                 err = 0;
 400                 goto done;
 401         }
 402         /* else, add a new source to the filter */
 403
 404         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 405                 err = -ENOBUFS;
 406                 goto done;
 407         }
 408         if (!psl || psl->sl_count == psl->sl_max) {
 409                 struct ip6_sf_socklist *newpsl;
 410                 int count = IP6_SFBLOCK;
 411
 412                 if (psl)
 413                         count += psl->sl_max;
 414                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 415                 if (!newpsl) {
 416                         err = -ENOBUFS;
 417                         goto done;
 418                 }
 419                 newpsl->sl_max = count;
 420                 newpsl->sl_count = count - IP6_SFBLOCK;
 421                 if (psl) {
 422                         for (i=0; i<psl->sl_count; i++)
 423                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 424                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 425                 }
 426                 pmc->sflist = psl = newpsl;
 427         }
 428         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 429         for (i=0; i<psl->sl_count; i++) {
 430                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 431                 if (rv == 0)
 432                         break;
 433         }
 434         if (rv == 0)            /* address already there is an error */
 435                 goto done;
 436         for (j=psl->sl_count-1; j>=i; j--)
 437                 psl->sl_addr[j+1] = psl->sl_addr[j];
 438         psl->sl_addr[i] = *source;
 439         psl->sl_count++;
 440         err = 0;
 441         /* update the interface list */
 442         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 443 done:
 444         if (pmclocked)
 445                 write_unlock(&pmc->sflock);
 446         read_unlock_bh(&idev->lock);
 447         rcu_read_unlock();
 448         if (leavegroup)
 449                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 450         return err;
 451 }
 452
 453 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 454 {
 455         const struct in6_addr *group;
 456         struct ipv6_mc_socklist *pmc;
 457         struct inet6_dev *idev;
 458         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 459         struct ip6_sf_socklist *newpsl, *psl;
 460         struct net *net = sock_net(sk);
 461         int leavegroup = 0;
 462         int i, err;
 463
 464         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 465
 466         if (!ipv6_addr_is_multicast(group))
 467                 return -EINVAL;
 468         if (gsf->gf_fmode != MCAST_INCLUDE &&
 469             gsf->gf_fmode != MCAST_EXCLUDE)
 470                 return -EINVAL;
 471
 472         rcu_read_lock();
 473         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 474
 475         if (!idev) {
 476                 rcu_read_unlock();
 477                 return -ENODEV;
 478         }
 479
 480         err = 0;
 481
 482         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 483                 leavegroup = 1;
 484                 goto done;
 485         }
 486
 487         for_each_pmc_rcu(inet6, pmc) {
 488                 if (pmc->ifindex != gsf->gf_interface)
 489                         continue;
 490                 if (ipv6_addr_equal(&pmc->addr, group))
 491                         break;
 492         }
 493         if (!pmc) {             /* must have a prior join */
 494                 err = -EINVAL;
 495                 goto done;
 496         }
 497         if (gsf->gf_numsrc) {
 498                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 499                                                           GFP_ATOMIC);
 500                 if (!newpsl) {
 501                         err = -ENOBUFS;
 502                         goto done;
 503                 }
 504                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 505                 for (i=0; i<newpsl->sl_count; ++i) {
 506                         struct sockaddr_in6 *psin6;
 507
 508                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 509                         newpsl->sl_addr[i] = psin6->sin6_addr;
 510                 }
 511                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 512                         newpsl->sl_count, newpsl->sl_addr, 0);
 513                 if (err) {
 514                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 515                         goto done;
 516                 }
 517         } else {
 518                 newpsl = NULL;
 519                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 520         }
 521
 522         write_lock(&pmc->sflock);
 523         psl = pmc->sflist;
 524         if (psl) {
 525                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 526                         psl->sl_count, psl->sl_addr, 0);
 527                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 528         } else
 529                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 530         pmc->sflist = newpsl;
 531         pmc->sfmode = gsf->gf_fmode;
 532         write_unlock(&pmc->sflock);
 533         err = 0;
 534 done:
 535         read_unlock_bh(&idev->lock);
 536         rcu_read_unlock();
 537         if (leavegroup)
 538                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 539         return err;
 540 }
 541
 542 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 543         struct group_filter __user *optval, int __user *optlen)
 544 {
 545         int err, i, count, copycount;
 546         const struct in6_addr *group;
 547         struct ipv6_mc_socklist *pmc;
 548         struct inet6_dev *idev;
 549         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 550         struct ip6_sf_socklist *psl;
 551         struct net *net = sock_net(sk);
 552
 553         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 554
 555         if (!ipv6_addr_is_multicast(group))
 556                 return -EINVAL;
 557
 558         rcu_read_lock();
 559         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 560
 561         if (!idev) {
 562                 rcu_read_unlock();
 563                 return -ENODEV;
 564         }
 565
 566         err = -EADDRNOTAVAIL;
 567         /*
 568          * changes to the ipv6_mc_list require the socket lock and
 569          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 570          * so reading the list is safe.
 571          */
 572
 573         for_each_pmc_rcu(inet6, pmc) {
 574                 if (pmc->ifindex != gsf->gf_interface)
 575                         continue;
 576                 if (ipv6_addr_equal(group, &pmc->addr))
 577                         break;
 578         }
 579         if (!pmc)               /* must have a prior join */
 580                 goto done;
 581         gsf->gf_fmode = pmc->sfmode;
 582         psl = pmc->sflist;
 583         count = psl ? psl->sl_count : 0;
 584         read_unlock_bh(&idev->lock);
 585         rcu_read_unlock();
 586
 587         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 588         gsf->gf_numsrc = count;
 589         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 590             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 591                 return -EFAULT;
 592         }
 593         /* changes to psl require the socket lock, a read lock on
 594          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 595          * have the socket lock, so reading here is safe.
 596          */
 597         for (i=0; i<copycount; i++) {
 598                 struct sockaddr_in6 *psin6;
 599                 struct sockaddr_storage ss;
 600
 601                 psin6 = (struct sockaddr_in6 *)&ss;
 602                 memset(&ss, 0, sizeof(ss));
 603                 psin6->sin6_family = AF_INET6;
 604                 psin6->sin6_addr = psl->sl_addr[i];
 605                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 606                         return -EFAULT;
 607         }
 608         return 0;
 609 done:
 610         read_unlock_bh(&idev->lock);
 611         rcu_read_unlock();
 612         return err;
 613 }
 614
 615 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 616                     const struct in6_addr *src_addr)
 617 {
 618         struct ipv6_pinfo *np = inet6_sk(sk);
 619         struct ipv6_mc_socklist *mc;
 620         struct ip6_sf_socklist *psl;
 621         bool rv = true;
 622
 623         rcu_read_lock();
 624         for_each_pmc_rcu(np, mc) {
 625                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 626                         break;
 627         }
 628         if (!mc) {
 629                 rcu_read_unlock();
 630                 return true;
 631         }
 632         read_lock(&mc->sflock);
 633         psl = mc->sflist;
 634         if (!psl) {
 635                 rv = mc->sfmode == MCAST_EXCLUDE;
 636         } else {
 637                 int i;
 638
 639                 for (i=0; i<psl->sl_count; i++) {
 640                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 641                                 break;
 642                 }
 643                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 644                         rv = false;
 645                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 646                         rv = false;
 647         }
 648         read_unlock(&mc->sflock);
 649         rcu_read_unlock();
 650
 651         return rv;
 652 }
 653
 654 static void ma_put(struct ifmcaddr6 *mc)
 655 {
 656         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 657                 in6_dev_put(mc->idev);
 658                 kfree(mc);
 659         }
 660 }
 661
 662 static void igmp6_group_added(struct ifmcaddr6 *mc)
 663 {
 664         struct net_device *dev = mc->idev->dev;
 665         char buf[MAX_ADDR_LEN];
 666
 667         spin_lock_bh(&mc->mca_lock);
 668         if (!(mc->mca_flags&MAF_LOADED)) {
 669                 mc->mca_flags |= MAF_LOADED;
 670                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 671                         dev_mc_add(dev, buf);
 672         }
 673         spin_unlock_bh(&mc->mca_lock);
 674
 675         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 676                 return;
 677
 678         if (MLD_V1_SEEN(mc->idev)) {
 679                 igmp6_join_group(mc);
 680                 return;
 681         }
 682         /* else v2 */
 683
 684         mc->mca_crcount = mc->idev->mc_qrv;
 685         mld_ifc_event(mc->idev);
 686 }
 687
 688 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 689 {
 690         struct net_device *dev = mc->idev->dev;
 691         char buf[MAX_ADDR_LEN];
 692
 693         spin_lock_bh(&mc->mca_lock);
 694         if (mc->mca_flags&MAF_LOADED) {
 695                 mc->mca_flags &= ~MAF_LOADED;
 696                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 697                         dev_mc_del(dev, buf);
 698         }
 699
 700         if (mc->mca_flags & MAF_NOREPORT)
 701                 goto done;
 702         spin_unlock_bh(&mc->mca_lock);
 703
 704         if (!mc->idev->dead)
 705                 igmp6_leave_group(mc);
 706
 707         spin_lock_bh(&mc->mca_lock);
 708         if (del_timer(&mc->mca_timer))
 709                 atomic_dec(&mc->mca_refcnt);
 710 done:
 711         ip6_mc_clear_src(mc);
 712         spin_unlock_bh(&mc->mca_lock);
 713 }
 714
 715 /*
 716  * deleted ifmcaddr6 manipulation
 717  */
 718 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 719 {
 720         struct ifmcaddr6 *pmc;
 721
 722         /* this is an "ifmcaddr6" for convenience; only the fields below
 723          * are actually used. In particular, the refcnt and users are not
 724          * used for management of the delete list. Using the same structure
 725          * for deleted items allows change reports to use common code with
 726          * non-deleted or query-response MCA's.
 727          */
 728         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 729         if (!pmc)
 730                 return;
 731
 732         spin_lock_bh(&im->mca_lock);
 733         spin_lock_init(&pmc->mca_lock);
 734         pmc->idev = im->idev;
 735         in6_dev_hold(idev);
 736         pmc->mca_addr = im->mca_addr;
 737         pmc->mca_crcount = idev->mc_qrv;
 738         pmc->mca_sfmode = im->mca_sfmode;
 739         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 740                 struct ip6_sf_list *psf;
 741
 742                 pmc->mca_tomb = im->mca_tomb;
 743                 pmc->mca_sources = im->mca_sources;
 744                 im->mca_tomb = im->mca_sources = NULL;
 745                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 746                         psf->sf_crcount = pmc->mca_crcount;
 747         }
 748         spin_unlock_bh(&im->mca_lock);
 749
 750         spin_lock_bh(&idev->mc_lock);
 751         pmc->next = idev->mc_tomb;
 752         idev->mc_tomb = pmc;
 753         spin_unlock_bh(&idev->mc_lock);
 754 }
 755
 756 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 757 {
 758         struct ifmcaddr6 *pmc, *pmc_prev;
 759         struct ip6_sf_list *psf, *psf_next;
 760
 761         spin_lock_bh(&idev->mc_lock);
 762         pmc_prev = NULL;
 763         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 764                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 765                         break;
 766                 pmc_prev = pmc;
 767         }
 768         if (pmc) {
 769                 if (pmc_prev)
 770                         pmc_prev->next = pmc->next;
 771                 else
 772                         idev->mc_tomb = pmc->next;
 773         }
 774         spin_unlock_bh(&idev->mc_lock);
 775
 776         if (pmc) {
 777                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 778                         psf_next = psf->sf_next;
 779                         kfree(psf);
 780                 }
 781                 in6_dev_put(pmc->idev);
 782                 kfree(pmc);
 783         }
 784 }
 785
 786 static void mld_clear_delrec(struct inet6_dev *idev)
 787 {
 788         struct ifmcaddr6 *pmc, *nextpmc;
 789
 790         spin_lock_bh(&idev->mc_lock);
 791         pmc = idev->mc_tomb;
 792         idev->mc_tomb = NULL;
 793         spin_unlock_bh(&idev->mc_lock);
 794
 795         for (; pmc; pmc = nextpmc) {
 796                 nextpmc = pmc->next;
 797                 ip6_mc_clear_src(pmc);
 798                 in6_dev_put(pmc->idev);
 799                 kfree(pmc);
 800         }
 801
 802         /* clear dead sources, too */
 803         read_lock_bh(&idev->lock);
 804         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 805                 struct ip6_sf_list *psf, *psf_next;
 806
 807                 spin_lock_bh(&pmc->mca_lock);
 808                 psf = pmc->mca_tomb;
 809                 pmc->mca_tomb = NULL;
 810                 spin_unlock_bh(&pmc->mca_lock);
 811                 for (; psf; psf=psf_next) {
 812                         psf_next = psf->sf_next;
 813                         kfree(psf);
 814                 }
 815         }
 816         read_unlock_bh(&idev->lock);
 817 }
 818
 819
 820 /*
 821  *      device multicast group inc (add if not found)
 822  */
 823 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 824 {
 825         struct ifmcaddr6 *mc;
 826         struct inet6_dev *idev;
 827
 828         /* we need to take a reference on idev */
 829         idev = in6_dev_get(dev);
 830
 831         if (idev == NULL)
 832                 return -EINVAL;
 833
 834         write_lock_bh(&idev->lock);
 835         if (idev->dead) {
 836                 write_unlock_bh(&idev->lock);
 837                 in6_dev_put(idev);
 838                 return -ENODEV;
 839         }
 840
 841         for (mc = idev->mc_list; mc; mc = mc->next) {
 842                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 843                         mc->mca_users++;
 844                         write_unlock_bh(&idev->lock);
 845                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 846                                 NULL, 0);
 847                         in6_dev_put(idev);
 848                         return 0;
 849                 }
 850         }
 851
 852         /*
 853          *      not found: create a new one.
 854          */
 855
 856         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 857
 858         if (mc == NULL) {
 859                 write_unlock_bh(&idev->lock);
 860                 in6_dev_put(idev);
 861                 return -ENOMEM;
 862         }
 863
 864         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 865
 866         mc->mca_addr = *addr;
 867         mc->idev = idev; /* (reference taken) */
 868         mc->mca_users = 1;
 869         /* mca_stamp should be updated upon changes */
 870         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 871         atomic_set(&mc->mca_refcnt, 2);
 872         spin_lock_init(&mc->mca_lock);
 873
 874         /* initial mode is (EX, empty) */
 875         mc->mca_sfmode = MCAST_EXCLUDE;
 876         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 877
 878         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 879             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 880                 mc->mca_flags |= MAF_NOREPORT;
 881
 882         mc->next = idev->mc_list;
 883         idev->mc_list = mc;
 884         write_unlock_bh(&idev->lock);
 885
 886         mld_del_delrec(idev, &mc->mca_addr);
 887         igmp6_group_added(mc);
 888         ma_put(mc);
 889         return 0;
 890 }
 891
 892 /*
 893  *      device multicast group del
 894  */
 895 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 896 {
 897         struct ifmcaddr6 *ma, **map;
 898
 899         write_lock_bh(&idev->lock);
 900         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 901                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 902                         if (--ma->mca_users == 0) {
 903                                 *map = ma->next;
 904                                 write_unlock_bh(&idev->lock);
 905
 906                                 igmp6_group_dropped(ma);
 907
 908                                 ma_put(ma);
 909                                 return 0;
 910                         }
 911                         write_unlock_bh(&idev->lock);
 912                         return 0;
 913                 }
 914         }
 915         write_unlock_bh(&idev->lock);
 916
 917         return -ENOENT;
 918 }
 919
 920 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 921 {
 922         struct inet6_dev *idev;
 923         int err;
 924
 925         rcu_read_lock();
 926
 927         idev = __in6_dev_get(dev);
 928         if (!idev)
 929                 err = -ENODEV;
 930         else
 931                 err = __ipv6_dev_mc_dec(idev, addr);
 932
 933         rcu_read_unlock();
 934         return err;
 935 }
 936
 937 /*
 938  *      check if the interface/address pair is valid
 939  */
 940 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 941                          const struct in6_addr *src_addr)
 942 {
 943         struct inet6_dev *idev;
 944         struct ifmcaddr6 *mc;
 945         bool rv = false;
 946
 947         rcu_read_lock();
 948         idev = __in6_dev_get(dev);
 949         if (idev) {
 950                 read_lock_bh(&idev->lock);
 951                 for (mc = idev->mc_list; mc; mc=mc->next) {
 952                         if (ipv6_addr_equal(&mc->mca_addr, group))
 953                                 break;
 954                 }
 955                 if (mc) {
 956                         if (src_addr && !ipv6_addr_any(src_addr)) {
 957                                 struct ip6_sf_list *psf;
 958
 959                                 spin_lock_bh(&mc->mca_lock);
 960                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 961                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 962                                                 break;
 963                                 }
 964                                 if (psf)
 965                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 966                                                 psf->sf_count[MCAST_EXCLUDE] !=
 967                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 968                                 else
 969                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 970                                 spin_unlock_bh(&mc->mca_lock);
 971                         } else
 972                                 rv = true; /* don't filter unspecified source */
 973                 }
 974                 read_unlock_bh(&idev->lock);
 975         }
 976         rcu_read_unlock();
 977         return rv;
 978 }
 979
 980 static void mld_gq_start_timer(struct inet6_dev *idev)
 981 {
 982         int tv = net_random() % idev->mc_maxdelay;
 983
 984         idev->mc_gq_running = 1;
 985         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
 986                 in6_dev_hold(idev);
 987 }
 988
 989 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
 990 {
 991         int tv = net_random() % delay;
 992
 993         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
 994                 in6_dev_hold(idev);
 995 }
 996
 997 /*
 998  *      IGMP handling (alias multicast ICMPv6 messages)
 999  */
1000
1001 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1002 {
1003         unsigned long delay = resptime;
1004
1005         /* Do not start timer for these addresses */
1006         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1007             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1008                 return;
1009
1010         if (del_timer(&ma->mca_timer)) {
1011                 atomic_dec(&ma->mca_refcnt);
1012                 delay = ma->mca_timer.expires - jiffies;
1013         }
1014
1015         if (delay >= resptime) {
1016                 if (resptime)
1017                         delay = net_random() % resptime;
1018                 else
1019                         delay = 1;
1020         }
1021         ma->mca_timer.expires = jiffies + delay;
1022         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1023                 atomic_inc(&ma->mca_refcnt);
1024         ma->mca_flags |= MAF_TIMER_RUNNING;
1025 }
1026
1027 /* mark EXCLUDE-mode sources */
1028 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1029                              const struct in6_addr *srcs)
1030 {
1031         struct ip6_sf_list *psf;
1032         int i, scount;
1033
1034         scount = 0;
1035         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1036                 if (scount == nsrcs)
1037                         break;
1038                 for (i=0; i<nsrcs; i++) {
1039                         /* skip inactive filters */
1040                         if (psf->sf_count[MCAST_INCLUDE] ||
1041                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1042                             psf->sf_count[MCAST_EXCLUDE])
1043                                 break;
1044                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1045                                 scount++;
1046                                 break;
1047                         }
1048                 }
1049         }
1050         pmc->mca_flags &= ~MAF_GSQUERY;
1051         if (scount == nsrcs)    /* all sources excluded */
1052                 return false;
1053         return true;
1054 }
1055
1056 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1057                             const struct in6_addr *srcs)
1058 {
1059         struct ip6_sf_list *psf;
1060         int i, scount;
1061
1062         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1063                 return mld_xmarksources(pmc, nsrcs, srcs);
1064
1065         /* mark INCLUDE-mode sources */
1066
1067         scount = 0;
1068         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1069                 if (scount == nsrcs)
1070                         break;
1071                 for (i=0; i<nsrcs; i++) {
1072                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1073                                 psf->sf_gsresp = 1;
1074                                 scount++;
1075                                 break;
1076                         }
1077                 }
1078         }
1079         if (!scount) {
1080                 pmc->mca_flags &= ~MAF_GSQUERY;
1081                 return false;
1082         }
1083         pmc->mca_flags |= MAF_GSQUERY;
1084         return true;
1085 }
1086
1087 /* called with rcu_read_lock() */
1088 int igmp6_event_query(struct sk_buff *skb)
1089 {
1090         struct mld2_query *mlh2 = NULL;
1091         struct ifmcaddr6 *ma;
1092         const struct in6_addr *group;
1093         unsigned long max_delay;
1094         struct inet6_dev *idev;
1095         struct mld_msg *mld;
1096         int group_type;
1097         int mark = 0;
1098         int len;
1099
1100         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1101                 return -EINVAL;
1102
1103         /* compute payload length excluding extension headers */
1104         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1105         len -= skb_network_header_len(skb);
1106
1107         /* Drop queries with not link local source */
1108         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1109                 return -EINVAL;
1110
1111         idev = __in6_dev_get(skb->dev);
1112
1113         if (idev == NULL)
1114                 return 0;
1115
1116         mld = (struct mld_msg *)icmp6_hdr(skb);
1117         group = &mld->mld_mca;
1118         group_type = ipv6_addr_type(group);
1119
1120         if (group_type != IPV6_ADDR_ANY &&
1121             !(group_type&IPV6_ADDR_MULTICAST))
1122                 return -EINVAL;
1123
1124         if (len == 24) {
1125                 int switchback;
1126                 /* MLDv1 router present */
1127
1128                 /* Translate milliseconds to jiffies */
1129                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1130
1131                 switchback = (idev->mc_qrv + 1) * max_delay;
1132                 idev->mc_v1_seen = jiffies + switchback;
1133
1134                 /* cancel the interface change timer */
1135                 idev->mc_ifc_count = 0;
1136                 if (del_timer(&idev->mc_ifc_timer))
1137                         __in6_dev_put(idev);
1138                 /* clear deleted report items */
1139                 mld_clear_delrec(idev);
1140         } else if (len >= 28) {
1141                 int srcs_offset = sizeof(struct mld2_query) -
1142                                   sizeof(struct icmp6hdr);
1143                 if (!pskb_may_pull(skb, srcs_offset))
1144                         return -EINVAL;
1145
1146                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1147                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1148                 if (!max_delay)
1149                         max_delay = 1;
1150                 idev->mc_maxdelay = max_delay;
1151                 if (mlh2->mld2q_qrv)
1152                         idev->mc_qrv = mlh2->mld2q_qrv;
1153                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1154                         if (mlh2->mld2q_nsrcs)
1155                                 return -EINVAL; /* no sources allowed */
1156
1157                         mld_gq_start_timer(idev);
1158                         return 0;
1159                 }
1160                 /* mark sources to include, if group & source-specific */
1161                 if (mlh2->mld2q_nsrcs != 0) {
1162                         if (!pskb_may_pull(skb, srcs_offset +
1163                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1164                                 return -EINVAL;
1165
1166                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1167                         mark = 1;
1168                 }
1169         } else
1170                 return -EINVAL;
1171
1172         read_lock_bh(&idev->lock);
1173         if (group_type == IPV6_ADDR_ANY) {
1174                 for (ma = idev->mc_list; ma; ma=ma->next) {
1175                         spin_lock_bh(&ma->mca_lock);
1176                         igmp6_group_queried(ma, max_delay);
1177                         spin_unlock_bh(&ma->mca_lock);
1178                 }
1179         } else {
1180                 for (ma = idev->mc_list; ma; ma=ma->next) {
1181                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1182                                 continue;
1183                         spin_lock_bh(&ma->mca_lock);
1184                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1185                                 /* gsquery <- gsquery && mark */
1186                                 if (!mark)
1187                                         ma->mca_flags &= ~MAF_GSQUERY;
1188                         } else {
1189                                 /* gsquery <- mark */
1190                                 if (mark)
1191                                         ma->mca_flags |= MAF_GSQUERY;
1192                                 else
1193                                         ma->mca_flags &= ~MAF_GSQUERY;
1194                         }
1195                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1196                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1197                                 igmp6_group_queried(ma, max_delay);
1198                         spin_unlock_bh(&ma->mca_lock);
1199                         break;
1200                 }
1201         }
1202         read_unlock_bh(&idev->lock);
1203
1204         return 0;
1205 }
1206
1207 /* called with rcu_read_lock() */
1208 int igmp6_event_report(struct sk_buff *skb)
1209 {
1210         struct ifmcaddr6 *ma;
1211         struct inet6_dev *idev;
1212         struct mld_msg *mld;
1213         int addr_type;
1214
1215         /* Our own report looped back. Ignore it. */
1216         if (skb->pkt_type == PACKET_LOOPBACK)
1217                 return 0;
1218
1219         /* send our report if the MC router may not have heard this report */
1220         if (skb->pkt_type != PACKET_MULTICAST &&
1221             skb->pkt_type != PACKET_BROADCAST)
1222                 return 0;
1223
1224         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1225                 return -EINVAL;
1226
1227         mld = (struct mld_msg *)icmp6_hdr(skb);
1228
1229         /* Drop reports with not link local source */
1230         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1231         if (addr_type != IPV6_ADDR_ANY &&
1232             !(addr_type&IPV6_ADDR_LINKLOCAL))
1233                 return -EINVAL;
1234
1235         idev = __in6_dev_get(skb->dev);
1236         if (idev == NULL)
1237                 return -ENODEV;
1238
1239         /*
1240          *      Cancel the timer for this group
1241          */
1242
1243         read_lock_bh(&idev->lock);
1244         for (ma = idev->mc_list; ma; ma=ma->next) {
1245                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1246                         spin_lock(&ma->mca_lock);
1247                         if (del_timer(&ma->mca_timer))
1248                                 atomic_dec(&ma->mca_refcnt);
1249                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1250                         spin_unlock(&ma->mca_lock);
1251                         break;
1252                 }
1253         }
1254         read_unlock_bh(&idev->lock);
1255         return 0;
1256 }
1257
1258 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1259                   int gdeleted, int sdeleted)
1260 {
1261         switch (type) {
1262         case MLD2_MODE_IS_INCLUDE:
1263         case MLD2_MODE_IS_EXCLUDE:
1264                 if (gdeleted || sdeleted)
1265                         return false;
1266                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1267                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1268                                 return true;
1269                         /* don't include if this source is excluded
1270                          * in all filters
1271                          */
1272                         if (psf->sf_count[MCAST_INCLUDE])
1273                                 return type == MLD2_MODE_IS_INCLUDE;
1274                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1275                                 psf->sf_count[MCAST_EXCLUDE];
1276                 }
1277                 return false;
1278         case MLD2_CHANGE_TO_INCLUDE:
1279                 if (gdeleted || sdeleted)
1280                         return false;
1281                 return psf->sf_count[MCAST_INCLUDE] != 0;
1282         case MLD2_CHANGE_TO_EXCLUDE:
1283                 if (gdeleted || sdeleted)
1284                         return false;
1285                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1286                     psf->sf_count[MCAST_INCLUDE])
1287                         return false;
1288                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1289                         psf->sf_count[MCAST_EXCLUDE];
1290         case MLD2_ALLOW_NEW_SOURCES:
1291                 if (gdeleted || !psf->sf_crcount)
1292                         return false;
1293                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1294         case MLD2_BLOCK_OLD_SOURCES:
1295                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1296                         return gdeleted || (psf->sf_crcount && sdeleted);
1297                 return psf->sf_crcount && !gdeleted && !sdeleted;
1298         }
1299         return false;
1300 }
1301
1302 static int
1303 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1304 {
1305         struct ip6_sf_list *psf;
1306         int scount = 0;
1307
1308         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1309                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1310                         continue;
1311                 scount++;
1312         }
1313         return scount;
1314 }
1315
1316 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1317 {
1318         struct net *net = dev_net(dev);
1319         struct sock *sk = net->ipv6.igmp_sk;
1320         struct sk_buff *skb;
1321         struct mld2_report *pmr;
1322         struct in6_addr addr_buf;
1323         const struct in6_addr *saddr;
1324         int hlen = LL_RESERVED_SPACE(dev);
1325         int tlen = dev->needed_tailroom;
1326         int err;
1327         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1328                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1329                      IPV6_TLV_PADN, 0 };
1330
1331         /* we assume size > sizeof(ra) here */
1332         size += hlen + tlen;
1333         /* limit our allocations to order-0 page */
1334         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1335         skb = sock_alloc_send_skb(sk, size, 1, &err);
1336
1337         if (!skb)
1338                 return NULL;
1339
1340         skb_reserve(skb, hlen);
1341
1342         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1343                 /* <draft-ietf-magma-mld-source-05.txt>:
1344                  * use unspecified address as the source address
1345                  * when a valid link-local address is not available.
1346                  */
1347                 saddr = &in6addr_any;
1348         } else
1349                 saddr = &addr_buf;
1350
1351         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1352
1353         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1354
1355         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1356         skb_put(skb, sizeof(*pmr));
1357         pmr = (struct mld2_report *)skb_transport_header(skb);
1358         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1359         pmr->mld2r_resv1 = 0;
1360         pmr->mld2r_cksum = 0;
1361         pmr->mld2r_resv2 = 0;
1362         pmr->mld2r_ngrec = 0;
1363         return skb;
1364 }
1365
1366 static void mld_sendpack(struct sk_buff *skb)
1367 {
1368         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1369         struct mld2_report *pmr =
1370                               (struct mld2_report *)skb_transport_header(skb);
1371         int payload_len, mldlen;
1372         struct inet6_dev *idev;
1373         struct net *net = dev_net(skb->dev);
1374         int err;
1375         struct flowi6 fl6;
1376         struct dst_entry *dst;
1377
1378         rcu_read_lock();
1379         idev = __in6_dev_get(skb->dev);
1380         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1381
1382         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1383         mldlen = skb->tail - skb->transport_header;
1384         pip6->payload_len = htons(payload_len);
1385
1386         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1387                                            IPPROTO_ICMPV6,
1388                                            csum_partial(skb_transport_header(skb),
1389                                                         mldlen, 0));
1390
1391         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1392                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1393                          skb->dev->ifindex);
1394         dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1395
1396         err = 0;
1397         if (IS_ERR(dst)) {
1398                 err = PTR_ERR(dst);
1399                 dst = NULL;
1400         }
1401         skb_dst_set(skb, dst);
1402         if (err)
1403                 goto err_out;
1404
1405         payload_len = skb->len;
1406
1407         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1408                       dst_output);
1409 out:
1410         if (!err) {
1411                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1412                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1413                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1414         } else
1415                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1416
1417         rcu_read_unlock();
1418         return;
1419
1420 err_out:
1421         kfree_skb(skb);
1422         goto out;
1423 }
1424
1425 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1426 {
1427         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1428 }
1429
1430 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1431         int type, struct mld2_grec **ppgr)
1432 {
1433         struct net_device *dev = pmc->idev->dev;
1434         struct mld2_report *pmr;
1435         struct mld2_grec *pgr;
1436
1437         if (!skb)
1438                 skb = mld_newpack(dev, dev->mtu);
1439         if (!skb)
1440                 return NULL;
1441         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1442         pgr->grec_type = type;
1443         pgr->grec_auxwords = 0;
1444         pgr->grec_nsrcs = 0;
1445         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1446         pmr = (struct mld2_report *)skb_transport_header(skb);
1447         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1448         *ppgr = pgr;
1449         return skb;
1450 }
1451
1452 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1453         skb_tailroom(skb)) : 0)
1454
1455 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1456         int type, int gdeleted, int sdeleted)
1457 {
1458         struct net_device *dev = pmc->idev->dev;
1459         struct mld2_report *pmr;
1460         struct mld2_grec *pgr = NULL;
1461         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1462         int scount, stotal, first, isquery, truncate;
1463
1464         if (pmc->mca_flags & MAF_NOREPORT)
1465                 return skb;
1466
1467         isquery = type == MLD2_MODE_IS_INCLUDE ||
1468                   type == MLD2_MODE_IS_EXCLUDE;
1469         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1470                     type == MLD2_CHANGE_TO_EXCLUDE;
1471
1472         stotal = scount = 0;
1473
1474         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1475
1476         if (!*psf_list)
1477                 goto empty_source;
1478
1479         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1480
1481         /* EX and TO_EX get a fresh packet, if needed */
1482         if (truncate) {
1483                 if (pmr && pmr->mld2r_ngrec &&
1484                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1485                         if (skb)
1486                                 mld_sendpack(skb);
1487                         skb = mld_newpack(dev, dev->mtu);
1488                 }
1489         }
1490         first = 1;
1491         psf_prev = NULL;
1492         for (psf=*psf_list; psf; psf=psf_next) {
1493                 struct in6_addr *psrc;
1494
1495                 psf_next = psf->sf_next;
1496
1497                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1498                         psf_prev = psf;
1499                         continue;
1500                 }
1501
1502                 /* clear marks on query responses */
1503                 if (isquery)
1504                         psf->sf_gsresp = 0;
1505
1506                 if (AVAILABLE(skb) < sizeof(*psrc) +
1507                     first*sizeof(struct mld2_grec)) {
1508                         if (truncate && !first)
1509                                 break;   /* truncate these */
1510                         if (pgr)
1511                                 pgr->grec_nsrcs = htons(scount);
1512                         if (skb)
1513                                 mld_sendpack(skb);
1514                         skb = mld_newpack(dev, dev->mtu);
1515                         first = 1;
1516                         scount = 0;
1517                 }
1518                 if (first) {
1519                         skb = add_grhead(skb, pmc, type, &pgr);
1520                         first = 0;
1521                 }
1522                 if (!skb)
1523                         return NULL;
1524                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1525                 *psrc = psf->sf_addr;
1526                 scount++; stotal++;
1527                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1528                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1529                         psf->sf_crcount--;
1530                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1531                                 if (psf_prev)
1532                                         psf_prev->sf_next = psf->sf_next;
1533                                 else
1534                                         *psf_list = psf->sf_next;
1535                                 kfree(psf);
1536                                 continue;
1537                         }
1538                 }
1539                 psf_prev = psf;
1540         }
1541
1542 empty_source:
1543         if (!stotal) {
1544                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1545                     type == MLD2_BLOCK_OLD_SOURCES)
1546                         return skb;
1547                 if (pmc->mca_crcount || isquery) {
1548                         /* make sure we have room for group header */
1549                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1550                                 mld_sendpack(skb);
1551                                 skb = NULL; /* add_grhead will get a new one */
1552                         }
1553                         skb = add_grhead(skb, pmc, type, &pgr);
1554                 }
1555         }
1556         if (pgr)
1557                 pgr->grec_nsrcs = htons(scount);
1558
1559         if (isquery)
1560                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1561         return skb;
1562 }
1563
1564 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1565 {
1566         struct sk_buff *skb = NULL;
1567         int type;
1568
1569         if (!pmc) {
1570                 read_lock_bh(&idev->lock);
1571                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1572                         if (pmc->mca_flags & MAF_NOREPORT)
1573                                 continue;
1574                         spin_lock_bh(&pmc->mca_lock);
1575                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1576                                 type = MLD2_MODE_IS_EXCLUDE;
1577                         else
1578                                 type = MLD2_MODE_IS_INCLUDE;
1579                         skb = add_grec(skb, pmc, type, 0, 0);
1580                         spin_unlock_bh(&pmc->mca_lock);
1581                 }
1582                 read_unlock_bh(&idev->lock);
1583         } else {
1584                 spin_lock_bh(&pmc->mca_lock);
1585                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1586                         type = MLD2_MODE_IS_EXCLUDE;
1587                 else
1588                         type = MLD2_MODE_IS_INCLUDE;
1589                 skb = add_grec(skb, pmc, type, 0, 0);
1590                 spin_unlock_bh(&pmc->mca_lock);
1591         }
1592         if (skb)
1593                 mld_sendpack(skb);
1594 }
1595
1596 /*
1597  * remove zero-count source records from a source filter list
1598  */
1599 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1600 {
1601         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1602
1603         psf_prev = NULL;
1604         for (psf=*ppsf; psf; psf = psf_next) {
1605                 psf_next = psf->sf_next;
1606                 if (psf->sf_crcount == 0) {
1607                         if (psf_prev)
1608                                 psf_prev->sf_next = psf->sf_next;
1609                         else
1610                                 *ppsf = psf->sf_next;
1611                         kfree(psf);
1612                 } else
1613                         psf_prev = psf;
1614         }
1615 }
1616
1617 static void mld_send_cr(struct inet6_dev *idev)
1618 {
1619         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1620         struct sk_buff *skb = NULL;
1621         int type, dtype;
1622
1623         read_lock_bh(&idev->lock);
1624         spin_lock(&idev->mc_lock);
1625
1626         /* deleted MCA's */
1627         pmc_prev = NULL;
1628         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1629                 pmc_next = pmc->next;
1630                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1631                         type = MLD2_BLOCK_OLD_SOURCES;
1632                         dtype = MLD2_BLOCK_OLD_SOURCES;
1633                         skb = add_grec(skb, pmc, type, 1, 0);
1634                         skb = add_grec(skb, pmc, dtype, 1, 1);
1635                 }
1636                 if (pmc->mca_crcount) {
1637                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1638                                 type = MLD2_CHANGE_TO_INCLUDE;
1639                                 skb = add_grec(skb, pmc, type, 1, 0);
1640                         }
1641                         pmc->mca_crcount--;
1642                         if (pmc->mca_crcount == 0) {
1643                                 mld_clear_zeros(&pmc->mca_tomb);
1644                                 mld_clear_zeros(&pmc->mca_sources);
1645                         }
1646                 }
1647                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1648                     !pmc->mca_sources) {
1649                         if (pmc_prev)
1650                                 pmc_prev->next = pmc_next;
1651                         else
1652                                 idev->mc_tomb = pmc_next;
1653                         in6_dev_put(pmc->idev);
1654                         kfree(pmc);
1655                 } else
1656                         pmc_prev = pmc;
1657         }
1658         spin_unlock(&idev->mc_lock);
1659
1660         /* change recs */
1661         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1662                 spin_lock_bh(&pmc->mca_lock);
1663                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1664                         type = MLD2_BLOCK_OLD_SOURCES;
1665                         dtype = MLD2_ALLOW_NEW_SOURCES;
1666                 } else {
1667                         type = MLD2_ALLOW_NEW_SOURCES;
1668                         dtype = MLD2_BLOCK_OLD_SOURCES;
1669                 }
1670                 skb = add_grec(skb, pmc, type, 0, 0);
1671                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1672
1673                 /* filter mode changes */
1674                 if (pmc->mca_crcount) {
1675                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1676                                 type = MLD2_CHANGE_TO_EXCLUDE;
1677                         else
1678                                 type = MLD2_CHANGE_TO_INCLUDE;
1679                         skb = add_grec(skb, pmc, type, 0, 0);
1680                         pmc->mca_crcount--;
1681                 }
1682                 spin_unlock_bh(&pmc->mca_lock);
1683         }
1684         read_unlock_bh(&idev->lock);
1685         if (!skb)
1686                 return;
1687         (void) mld_sendpack(skb);
1688 }
1689
1690 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1691 {
1692         struct net *net = dev_net(dev);
1693         struct sock *sk = net->ipv6.igmp_sk;
1694         struct inet6_dev *idev;
1695         struct sk_buff *skb;
1696         struct mld_msg *hdr;
1697         const struct in6_addr *snd_addr, *saddr;
1698         struct in6_addr addr_buf;
1699         int hlen = LL_RESERVED_SPACE(dev);
1700         int tlen = dev->needed_tailroom;
1701         int err, len, payload_len, full_len;
1702         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1703                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1704                      IPV6_TLV_PADN, 0 };
1705         struct flowi6 fl6;
1706         struct dst_entry *dst;
1707
1708         if (type == ICMPV6_MGM_REDUCTION)
1709                 snd_addr = &in6addr_linklocal_allrouters;
1710         else
1711                 snd_addr = addr;
1712
1713         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1714         payload_len = len + sizeof(ra);
1715         full_len = sizeof(struct ipv6hdr) + payload_len;
1716
1717         rcu_read_lock();
1718         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1719                       IPSTATS_MIB_OUT, full_len);
1720         rcu_read_unlock();
1721
1722         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1723
1724         if (skb == NULL) {
1725                 rcu_read_lock();
1726                 IP6_INC_STATS(net, __in6_dev_get(dev),
1727                               IPSTATS_MIB_OUTDISCARDS);
1728                 rcu_read_unlock();
1729                 return;
1730         }
1731
1732         skb_reserve(skb, hlen);
1733
1734         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1735                 /* <draft-ietf-magma-mld-source-05.txt>:
1736                  * use unspecified address as the source address
1737                  * when a valid link-local address is not available.
1738                  */
1739                 saddr = &in6addr_any;
1740         } else
1741                 saddr = &addr_buf;
1742
1743         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1744
1745         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1746
1747         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1748         memset(hdr, 0, sizeof(struct mld_msg));
1749         hdr->mld_type = type;
1750         hdr->mld_mca = *addr;
1751
1752         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1753                                          IPPROTO_ICMPV6,
1754                                          csum_partial(hdr, len, 0));
1755
1756         rcu_read_lock();
1757         idev = __in6_dev_get(skb->dev);
1758
1759         icmpv6_flow_init(sk, &fl6, type,
1760                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1761                          skb->dev->ifindex);
1762         dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1763         if (IS_ERR(dst)) {
1764                 err = PTR_ERR(dst);
1765                 goto err_out;
1766         }
1767
1768         skb_dst_set(skb, dst);
1769         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1770                       dst_output);
1771 out:
1772         if (!err) {
1773                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1774                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1775                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1776         } else
1777                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1778
1779         rcu_read_unlock();
1780         return;
1781
1782 err_out:
1783         kfree_skb(skb);
1784         goto out;
1785 }
1786
1787 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1788         const struct in6_addr *psfsrc)
1789 {
1790         struct ip6_sf_list *psf, *psf_prev;
1791         int rv = 0;
1792
1793         psf_prev = NULL;
1794         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1795                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1796                         break;
1797                 psf_prev = psf;
1798         }
1799         if (!psf || psf->sf_count[sfmode] == 0) {
1800                 /* source filter not found, or count wrong =>  bug */
1801                 return -ESRCH;
1802         }
1803         psf->sf_count[sfmode]--;
1804         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1805                 struct inet6_dev *idev = pmc->idev;
1806
1807                 /* no more filters for this source */
1808                 if (psf_prev)
1809                         psf_prev->sf_next = psf->sf_next;
1810                 else
1811                         pmc->mca_sources = psf->sf_next;
1812                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1813                     !MLD_V1_SEEN(idev)) {
1814                         psf->sf_crcount = idev->mc_qrv;
1815                         psf->sf_next = pmc->mca_tomb;
1816                         pmc->mca_tomb = psf;
1817                         rv = 1;
1818                 } else
1819                         kfree(psf);
1820         }
1821         return rv;
1822 }
1823
1824 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1825                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1826                           int delta)
1827 {
1828         struct ifmcaddr6 *pmc;
1829         int     changerec = 0;
1830         int     i, err;
1831
1832         if (!idev)
1833                 return -ENODEV;
1834         read_lock_bh(&idev->lock);
1835         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1836                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1837                         break;
1838         }
1839         if (!pmc) {
1840                 /* MCA not found?? bug */
1841                 read_unlock_bh(&idev->lock);
1842                 return -ESRCH;
1843         }
1844         spin_lock_bh(&pmc->mca_lock);
1845         sf_markstate(pmc);
1846         if (!delta) {
1847                 if (!pmc->mca_sfcount[sfmode]) {
1848                         spin_unlock_bh(&pmc->mca_lock);
1849                         read_unlock_bh(&idev->lock);
1850                         return -EINVAL;
1851                 }
1852                 pmc->mca_sfcount[sfmode]--;
1853         }
1854         err = 0;
1855         for (i=0; i<sfcount; i++) {
1856                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1857
1858                 changerec |= rv > 0;
1859                 if (!err && rv < 0)
1860                         err = rv;
1861         }
1862         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1863             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1864             pmc->mca_sfcount[MCAST_INCLUDE]) {
1865                 struct ip6_sf_list *psf;
1866
1867                 /* filter mode change */
1868                 pmc->mca_sfmode = MCAST_INCLUDE;
1869                 pmc->mca_crcount = idev->mc_qrv;
1870                 idev->mc_ifc_count = pmc->mca_crcount;
1871                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1872                         psf->sf_crcount = 0;
1873                 mld_ifc_event(pmc->idev);
1874         } else if (sf_setstate(pmc) || changerec)
1875                 mld_ifc_event(pmc->idev);
1876         spin_unlock_bh(&pmc->mca_lock);
1877         read_unlock_bh(&idev->lock);
1878         return err;
1879 }
1880
1881 /*
1882  * Add multicast single-source filter to the interface list
1883  */
1884 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1885         const struct in6_addr *psfsrc)
1886 {
1887         struct ip6_sf_list *psf, *psf_prev;
1888
1889         psf_prev = NULL;
1890         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1891                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1892                         break;
1893                 psf_prev = psf;
1894         }
1895         if (!psf) {
1896                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1897                 if (!psf)
1898                         return -ENOBUFS;
1899
1900                 psf->sf_addr = *psfsrc;
1901                 if (psf_prev) {
1902                         psf_prev->sf_next = psf;
1903                 } else
1904                         pmc->mca_sources = psf;
1905         }
1906         psf->sf_count[sfmode]++;
1907         return 0;
1908 }
1909
1910 static void sf_markstate(struct ifmcaddr6 *pmc)
1911 {
1912         struct ip6_sf_list *psf;
1913         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1914
1915         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1916                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1917                         psf->sf_oldin = mca_xcount ==
1918                                 psf->sf_count[MCAST_EXCLUDE] &&
1919                                 !psf->sf_count[MCAST_INCLUDE];
1920                 } else
1921                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1922 }
1923
1924 static int sf_setstate(struct ifmcaddr6 *pmc)
1925 {
1926         struct ip6_sf_list *psf, *dpsf;
1927         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1928         int qrv = pmc->idev->mc_qrv;
1929         int new_in, rv;
1930
1931         rv = 0;
1932         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1933                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1934                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1935                                 !psf->sf_count[MCAST_INCLUDE];
1936                 } else
1937                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1938                 if (new_in) {
1939                         if (!psf->sf_oldin) {
1940                                 struct ip6_sf_list *prev = NULL;
1941
1942                                 for (dpsf=pmc->mca_tomb; dpsf;
1943                                      dpsf=dpsf->sf_next) {
1944                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1945                                             &psf->sf_addr))
1946                                                 break;
1947                                         prev = dpsf;
1948                                 }
1949                                 if (dpsf) {
1950                                         if (prev)
1951                                                 prev->sf_next = dpsf->sf_next;
1952                                         else
1953                                                 pmc->mca_tomb = dpsf->sf_next;
1954                                         kfree(dpsf);
1955                                 }
1956                                 psf->sf_crcount = qrv;
1957                                 rv++;
1958                         }
1959                 } else if (psf->sf_oldin) {
1960                         psf->sf_crcount = 0;
1961                         /*
1962                          * add or update "delete" records if an active filter
1963                          * is now inactive
1964                          */
1965                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1966                                 if (ipv6_addr_equal(&dpsf->sf_addr,
1967                                     &psf->sf_addr))
1968                                         break;
1969                         if (!dpsf) {
1970                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1971                                 if (!dpsf)
1972                                         continue;
1973                                 *dpsf = *psf;
1974                                 /* pmc->mca_lock held by callers */
1975                                 dpsf->sf_next = pmc->mca_tomb;
1976                                 pmc->mca_tomb = dpsf;
1977                         }
1978                         dpsf->sf_crcount = qrv;
1979                         rv++;
1980                 }
1981         }
1982         return rv;
1983 }
1984
1985 /*
1986  * Add multicast source filter list to the interface list
1987  */
1988 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1989                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1990                           int delta)
1991 {
1992         struct ifmcaddr6 *pmc;
1993         int     isexclude;
1994         int     i, err;
1995
1996         if (!idev)
1997                 return -ENODEV;
1998         read_lock_bh(&idev->lock);
1999         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2000                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2001                         break;
2002         }
2003         if (!pmc) {
2004                 /* MCA not found?? bug */
2005                 read_unlock_bh(&idev->lock);
2006                 return -ESRCH;
2007         }
2008         spin_lock_bh(&pmc->mca_lock);
2009
2010         sf_markstate(pmc);
2011         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2012         if (!delta)
2013                 pmc->mca_sfcount[sfmode]++;
2014         err = 0;
2015         for (i=0; i<sfcount; i++) {
2016                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2017                 if (err)
2018                         break;
2019         }
2020         if (err) {
2021                 int j;
2022
2023                 if (!delta)
2024                         pmc->mca_sfcount[sfmode]--;
2025                 for (j=0; j<i; j++)
2026                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2027         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2028                 struct ip6_sf_list *psf;
2029
2030                 /* filter mode change */
2031                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2032                         pmc->mca_sfmode = MCAST_EXCLUDE;
2033                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2034                         pmc->mca_sfmode = MCAST_INCLUDE;
2035                 /* else no filters; keep old mode for reports */
2036
2037                 pmc->mca_crcount = idev->mc_qrv;
2038                 idev->mc_ifc_count = pmc->mca_crcount;
2039                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2040                         psf->sf_crcount = 0;
2041                 mld_ifc_event(idev);
2042         } else if (sf_setstate(pmc))
2043                 mld_ifc_event(idev);
2044         spin_unlock_bh(&pmc->mca_lock);
2045         read_unlock_bh(&idev->lock);
2046         return err;
2047 }
2048
2049 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2050 {
2051         struct ip6_sf_list *psf, *nextpsf;
2052
2053         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2054                 nextpsf = psf->sf_next;
2055                 kfree(psf);
2056         }
2057         pmc->mca_tomb = NULL;
2058         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2059                 nextpsf = psf->sf_next;
2060                 kfree(psf);
2061         }
2062         pmc->mca_sources = NULL;
2063         pmc->mca_sfmode = MCAST_EXCLUDE;
2064         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2065         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2066 }
2067
2068
2069 static void igmp6_join_group(struct ifmcaddr6 *ma)
2070 {
2071         unsigned long delay;
2072
2073         if (ma->mca_flags & MAF_NOREPORT)
2074                 return;
2075
2076         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2077
2078         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2079
2080         spin_lock_bh(&ma->mca_lock);
2081         if (del_timer(&ma->mca_timer)) {
2082                 atomic_dec(&ma->mca_refcnt);
2083                 delay = ma->mca_timer.expires - jiffies;
2084         }
2085
2086         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2087                 atomic_inc(&ma->mca_refcnt);
2088         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2089         spin_unlock_bh(&ma->mca_lock);
2090 }
2091
2092 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2093                             struct inet6_dev *idev)
2094 {
2095         int err;
2096
2097         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2098          * so no other readers or writers of iml or its sflist
2099          */
2100         if (!iml->sflist) {
2101                 /* any-source empty exclude case */
2102                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2103         }
2104         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2105                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2106         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2107         iml->sflist = NULL;
2108         return err;
2109 }
2110
2111 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2112 {
2113         if (MLD_V1_SEEN(ma->idev)) {
2114                 if (ma->mca_flags & MAF_LAST_REPORTER)
2115                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2116                                 ICMPV6_MGM_REDUCTION);
2117         } else {
2118                 mld_add_delrec(ma->idev, ma);
2119                 mld_ifc_event(ma->idev);
2120         }
2121 }
2122
2123 static void mld_gq_timer_expire(unsigned long data)
2124 {
2125         struct inet6_dev *idev = (struct inet6_dev *)data;
2126
2127         idev->mc_gq_running = 0;
2128         mld_send_report(idev, NULL);
2129         __in6_dev_put(idev);
2130 }
2131
2132 static void mld_ifc_timer_expire(unsigned long data)
2133 {
2134         struct inet6_dev *idev = (struct inet6_dev *)data;
2135
2136         mld_send_cr(idev);
2137         if (idev->mc_ifc_count) {
2138                 idev->mc_ifc_count--;
2139                 if (idev->mc_ifc_count)
2140                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2141         }
2142         __in6_dev_put(idev);
2143 }
2144
2145 static void mld_ifc_event(struct inet6_dev *idev)
2146 {
2147         if (MLD_V1_SEEN(idev))
2148                 return;
2149         idev->mc_ifc_count = idev->mc_qrv;
2150         mld_ifc_start_timer(idev, 1);
2151 }
2152
2153
2154 static void igmp6_timer_handler(unsigned long data)
2155 {
2156         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2157
2158         if (MLD_V1_SEEN(ma->idev))
2159                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2160         else
2161                 mld_send_report(ma->idev, ma);
2162
2163         spin_lock(&ma->mca_lock);
2164         ma->mca_flags |=  MAF_LAST_REPORTER;
2165         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2166         spin_unlock(&ma->mca_lock);
2167         ma_put(ma);
2168 }
2169
2170 /* Device changing type */
2171
2172 void ipv6_mc_unmap(struct inet6_dev *idev)
2173 {
2174         struct ifmcaddr6 *i;
2175
2176         /* Install multicast list, except for all-nodes (already installed) */
2177
2178         read_lock_bh(&idev->lock);
2179         for (i = idev->mc_list; i; i = i->next)
2180                 igmp6_group_dropped(i);
2181         read_unlock_bh(&idev->lock);
2182 }
2183
2184 void ipv6_mc_remap(struct inet6_dev *idev)
2185 {
2186         ipv6_mc_up(idev);
2187 }
2188
2189 /* Device going down */
2190
2191 void ipv6_mc_down(struct inet6_dev *idev)
2192 {
2193         struct ifmcaddr6 *i;
2194
2195         /* Withdraw multicast list */
2196
2197         read_lock_bh(&idev->lock);
2198         idev->mc_ifc_count = 0;
2199         if (del_timer(&idev->mc_ifc_timer))
2200                 __in6_dev_put(idev);
2201         idev->mc_gq_running = 0;
2202         if (del_timer(&idev->mc_gq_timer))
2203                 __in6_dev_put(idev);
2204
2205         for (i = idev->mc_list; i; i=i->next)
2206                 igmp6_group_dropped(i);
2207         read_unlock_bh(&idev->lock);
2208
2209         mld_clear_delrec(idev);
2210 }
2211
2212
2213 /* Device going up */
2214
2215 void ipv6_mc_up(struct inet6_dev *idev)
2216 {
2217         struct ifmcaddr6 *i;
2218
2219         /* Install multicast list, except for all-nodes (already installed) */
2220
2221         read_lock_bh(&idev->lock);
2222         for (i = idev->mc_list; i; i=i->next)
2223                 igmp6_group_added(i);
2224         read_unlock_bh(&idev->lock);
2225 }
2226
2227 /* IPv6 device initialization. */
2228
2229 void ipv6_mc_init_dev(struct inet6_dev *idev)
2230 {
2231         write_lock_bh(&idev->lock);
2232         spin_lock_init(&idev->mc_lock);
2233         idev->mc_gq_running = 0;
2234         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2235                         (unsigned long)idev);
2236         idev->mc_tomb = NULL;
2237         idev->mc_ifc_count = 0;
2238         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2239                         (unsigned long)idev);
2240         idev->mc_qrv = MLD_QRV_DEFAULT;
2241         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2242         idev->mc_v1_seen = 0;
2243         write_unlock_bh(&idev->lock);
2244 }
2245
2246 /*
2247  *      Device is about to be destroyed: clean up.
2248  */
2249
2250 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2251 {
2252         struct ifmcaddr6 *i;
2253
2254         /* Deactivate timers */
2255         ipv6_mc_down(idev);
2256
2257         /* Delete all-nodes address. */
2258         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2259          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2260          * fail.
2261          */
2262         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2263
2264         if (idev->cnf.forwarding)
2265                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2266
2267         write_lock_bh(&idev->lock);
2268         while ((i = idev->mc_list) != NULL) {
2269                 idev->mc_list = i->next;
2270                 write_unlock_bh(&idev->lock);
2271
2272                 igmp6_group_dropped(i);
2273                 ma_put(i);
2274
2275                 write_lock_bh(&idev->lock);
2276         }
2277         write_unlock_bh(&idev->lock);
2278 }
2279
2280 #ifdef CONFIG_PROC_FS
2281 struct igmp6_mc_iter_state {
2282         struct seq_net_private p;
2283         struct net_device *dev;
2284         struct inet6_dev *idev;
2285 };
2286
2287 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2288
2289 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2290 {
2291         struct ifmcaddr6 *im = NULL;
2292         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2293         struct net *net = seq_file_net(seq);
2294
2295         state->idev = NULL;
2296         for_each_netdev_rcu(net, state->dev) {
2297                 struct inet6_dev *idev;
2298                 idev = __in6_dev_get(state->dev);
2299                 if (!idev)
2300                         continue;
2301                 read_lock_bh(&idev->lock);
2302                 im = idev->mc_list;
2303                 if (im) {
2304                         state->idev = idev;
2305                         break;
2306                 }
2307                 read_unlock_bh(&idev->lock);
2308         }
2309         return im;
2310 }
2311
2312 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2313 {
2314         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2315
2316         im = im->next;
2317         while (!im) {
2318                 if (likely(state->idev != NULL))
2319                         read_unlock_bh(&state->idev->lock);
2320
2321                 state->dev = next_net_device_rcu(state->dev);
2322                 if (!state->dev) {
2323                         state->idev = NULL;
2324                         break;
2325                 }
2326                 state->idev = __in6_dev_get(state->dev);
2327                 if (!state->idev)
2328                         continue;
2329                 read_lock_bh(&state->idev->lock);
2330                 im = state->idev->mc_list;
2331         }
2332         return im;
2333 }
2334
2335 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2336 {
2337         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2338         if (im)
2339                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2340                         --pos;
2341         return pos ? NULL : im;
2342 }
2343
2344 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2345         __acquires(RCU)
2346 {
2347         rcu_read_lock();
2348         return igmp6_mc_get_idx(seq, *pos);
2349 }
2350
2351 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2352 {
2353         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2354
2355         ++*pos;
2356         return im;
2357 }
2358
2359 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2360         __releases(RCU)
2361 {
2362         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2363
2364         if (likely(state->idev != NULL)) {
2365                 read_unlock_bh(&state->idev->lock);
2366                 state->idev = NULL;
2367         }
2368         state->dev = NULL;
2369         rcu_read_unlock();
2370 }
2371
2372 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2373 {
2374         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2375         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2376
2377         seq_printf(seq,
2378                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2379                    state->dev->ifindex, state->dev->name,
2380                    &im->mca_addr,
2381                    im->mca_users, im->mca_flags,
2382                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2383                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2384         return 0;
2385 }
2386
2387 static const struct seq_operations igmp6_mc_seq_ops = {
2388         .start  =       igmp6_mc_seq_start,
2389         .next   =       igmp6_mc_seq_next,
2390         .stop   =       igmp6_mc_seq_stop,
2391         .show   =       igmp6_mc_seq_show,
2392 };
2393
2394 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2395 {
2396         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2397                             sizeof(struct igmp6_mc_iter_state));
2398 }
2399
2400 static const struct file_operations igmp6_mc_seq_fops = {
2401         .owner          =       THIS_MODULE,
2402         .open           =       igmp6_mc_seq_open,
2403         .read           =       seq_read,
2404         .llseek         =       seq_lseek,
2405         .release        =       seq_release_net,
2406 };
2407
2408 struct igmp6_mcf_iter_state {
2409         struct seq_net_private p;
2410         struct net_device *dev;
2411         struct inet6_dev *idev;
2412         struct ifmcaddr6 *im;
2413 };
2414
2415 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2416
2417 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2418 {
2419         struct ip6_sf_list *psf = NULL;
2420         struct ifmcaddr6 *im = NULL;
2421         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2422         struct net *net = seq_file_net(seq);
2423
2424         state->idev = NULL;
2425         state->im = NULL;
2426         for_each_netdev_rcu(net, state->dev) {
2427                 struct inet6_dev *idev;
2428                 idev = __in6_dev_get(state->dev);
2429                 if (unlikely(idev == NULL))
2430                         continue;
2431                 read_lock_bh(&idev->lock);
2432                 im = idev->mc_list;
2433                 if (likely(im != NULL)) {
2434                         spin_lock_bh(&im->mca_lock);
2435                         psf = im->mca_sources;
2436                         if (likely(psf != NULL)) {
2437                                 state->im = im;
2438                                 state->idev = idev;
2439                                 break;
2440                         }
2441                         spin_unlock_bh(&im->mca_lock);
2442                 }
2443                 read_unlock_bh(&idev->lock);
2444         }
2445         return psf;
2446 }
2447
2448 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2449 {
2450         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2451
2452         psf = psf->sf_next;
2453         while (!psf) {
2454                 spin_unlock_bh(&state->im->mca_lock);
2455                 state->im = state->im->next;
2456                 while (!state->im) {
2457                         if (likely(state->idev != NULL))
2458                                 read_unlock_bh(&state->idev->lock);
2459
2460                         state->dev = next_net_device_rcu(state->dev);
2461                         if (!state->dev) {
2462                                 state->idev = NULL;
2463                                 goto out;
2464                         }
2465                         state->idev = __in6_dev_get(state->dev);
2466                         if (!state->idev)
2467                                 continue;
2468                         read_lock_bh(&state->idev->lock);
2469                         state->im = state->idev->mc_list;
2470                 }
2471                 if (!state->im)
2472                         break;
2473                 spin_lock_bh(&state->im->mca_lock);
2474                 psf = state->im->mca_sources;
2475         }
2476 out:
2477         return psf;
2478 }
2479
2480 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2481 {
2482         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2483         if (psf)
2484                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2485                         --pos;
2486         return pos ? NULL : psf;
2487 }
2488
2489 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2490         __acquires(RCU)
2491 {
2492         rcu_read_lock();
2493         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2494 }
2495
2496 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2497 {
2498         struct ip6_sf_list *psf;
2499         if (v == SEQ_START_TOKEN)
2500                 psf = igmp6_mcf_get_first(seq);
2501         else
2502                 psf = igmp6_mcf_get_next(seq, v);
2503         ++*pos;
2504         return psf;
2505 }
2506
2507 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2508         __releases(RCU)
2509 {
2510         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2511         if (likely(state->im != NULL)) {
2512                 spin_unlock_bh(&state->im->mca_lock);
2513                 state->im = NULL;
2514         }
2515         if (likely(state->idev != NULL)) {
2516                 read_unlock_bh(&state->idev->lock);
2517                 state->idev = NULL;
2518         }
2519         state->dev = NULL;
2520         rcu_read_unlock();
2521 }
2522
2523 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2524 {
2525         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2526         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2527
2528         if (v == SEQ_START_TOKEN) {
2529                 seq_printf(seq,
2530                            "%3s %6s "
2531                            "%32s %32s %6s %6s\n", "Idx",
2532                            "Device", "Multicast Address",
2533                            "Source Address", "INC", "EXC");
2534         } else {
2535                 seq_printf(seq,
2536                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2537                            state->dev->ifindex, state->dev->name,
2538                            &state->im->mca_addr,
2539                            &psf->sf_addr,
2540                            psf->sf_count[MCAST_INCLUDE],
2541                            psf->sf_count[MCAST_EXCLUDE]);
2542         }
2543         return 0;
2544 }
2545
2546 static const struct seq_operations igmp6_mcf_seq_ops = {
2547         .start  =       igmp6_mcf_seq_start,
2548         .next   =       igmp6_mcf_seq_next,
2549         .stop   =       igmp6_mcf_seq_stop,
2550         .show   =       igmp6_mcf_seq_show,
2551 };
2552
2553 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2554 {
2555         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2556                             sizeof(struct igmp6_mcf_iter_state));
2557 }
2558
2559 static const struct file_operations igmp6_mcf_seq_fops = {
2560         .owner          =       THIS_MODULE,
2561         .open           =       igmp6_mcf_seq_open,
2562         .read           =       seq_read,
2563         .llseek         =       seq_lseek,
2564         .release        =       seq_release_net,
2565 };
2566
2567 static int __net_init igmp6_proc_init(struct net *net)
2568 {
2569         int err;
2570
2571         err = -ENOMEM;
2572         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2573                 goto out;
2574         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2575                                   &igmp6_mcf_seq_fops))
2576                 goto out_proc_net_igmp6;
2577
2578         err = 0;
2579 out:
2580         return err;
2581
2582 out_proc_net_igmp6:
2583         proc_net_remove(net, "igmp6");
2584         goto out;
2585 }
2586
2587 static void __net_exit igmp6_proc_exit(struct net *net)
2588 {
2589         proc_net_remove(net, "mcfilter6");
2590         proc_net_remove(net, "igmp6");
2591 }
2592 #else
2593 static inline int igmp6_proc_init(struct net *net)
2594 {
2595         return 0;
2596 }
2597 static inline void igmp6_proc_exit(struct net *net)
2598 {
2599 }
2600 #endif
2601
2602 static int __net_init igmp6_net_init(struct net *net)
2603 {
2604         int err;
2605
2606         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2607                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2608         if (err < 0) {
2609                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2610                        err);
2611                 goto out;
2612         }
2613
2614         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2615
2616         err = igmp6_proc_init(net);
2617         if (err)
2618                 goto out_sock_create;
2619 out:
2620         return err;
2621
2622 out_sock_create:
2623         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2624         goto out;
2625 }
2626
2627 static void __net_exit igmp6_net_exit(struct net *net)
2628 {
2629         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2630         igmp6_proc_exit(net);
2631 }
2632
2633 static struct pernet_operations igmp6_net_ops = {
2634         .init = igmp6_net_init,
2635         .exit = igmp6_net_exit,
2636 };
2637
2638 int __init igmp6_init(void)
2639 {
2640         return register_pernet_subsys(&igmp6_net_ops);
2641 }
2642
2643 void igmp6_cleanup(void)
2644 {
2645         unregister_pernet_subsys(&igmp6_net_ops);
2646 }