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                         dst_release(&rt->dst);
 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                         dst_release(&rt->dst);
 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         spin_lock(&ipv6_sk_mc_lock);
 288         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 289                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 290                 struct net_device *dev;
 291
 292                 np->ipv6_mc_list = mc_lst->next;
 293                 spin_unlock(&ipv6_sk_mc_lock);
 294
 295                 rcu_read_lock();
 296                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 297                 if (dev) {
 298                         struct inet6_dev *idev = __in6_dev_get(dev);
 299
 300                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 301                         if (idev)
 302                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 303                 } else
 304                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 305                 rcu_read_unlock();
 306
 307                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 308                 kfree_rcu(mc_lst, rcu);
 309
 310                 spin_lock(&ipv6_sk_mc_lock);
 311         }
 312         spin_unlock(&ipv6_sk_mc_lock);
 313 }
 314
 315 int ip6_mc_source(int add, int omode, struct sock *sk,
 316         struct group_source_req *pgsr)
 317 {
 318         struct in6_addr *source, *group;
 319         struct ipv6_mc_socklist *pmc;
 320         struct inet6_dev *idev;
 321         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 322         struct ip6_sf_socklist *psl;
 323         struct net *net = sock_net(sk);
 324         int i, j, rv;
 325         int leavegroup = 0;
 326         int pmclocked = 0;
 327         int err;
 328
 329         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 330         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 331
 332         if (!ipv6_addr_is_multicast(group))
 333                 return -EINVAL;
 334
 335         rcu_read_lock();
 336         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 337         if (!idev) {
 338                 rcu_read_unlock();
 339                 return -ENODEV;
 340         }
 341
 342         err = -EADDRNOTAVAIL;
 343
 344         for_each_pmc_rcu(inet6, pmc) {
 345                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 346                         continue;
 347                 if (ipv6_addr_equal(&pmc->addr, group))
 348                         break;
 349         }
 350         if (!pmc) {             /* must have a prior join */
 351                 err = -EINVAL;
 352                 goto done;
 353         }
 354         /* if a source filter was set, must be the same mode as before */
 355         if (pmc->sflist) {
 356                 if (pmc->sfmode != omode) {
 357                         err = -EINVAL;
 358                         goto done;
 359                 }
 360         } else if (pmc->sfmode != omode) {
 361                 /* allow mode switches for empty-set filters */
 362                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 363                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 364                 pmc->sfmode = omode;
 365         }
 366
 367         write_lock(&pmc->sflock);
 368         pmclocked = 1;
 369
 370         psl = pmc->sflist;
 371         if (!add) {
 372                 if (!psl)
 373                         goto done;      /* err = -EADDRNOTAVAIL */
 374                 rv = !0;
 375                 for (i=0; i<psl->sl_count; i++) {
 376                         rv = memcmp(&psl->sl_addr[i], source,
 377                                 sizeof(struct in6_addr));
 378                         if (rv == 0)
 379                                 break;
 380                 }
 381                 if (rv)         /* source not found */
 382                         goto done;      /* err = -EADDRNOTAVAIL */
 383
 384                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 385                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 386                         leavegroup = 1;
 387                         goto done;
 388                 }
 389
 390                 /* update the interface filter */
 391                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 392
 393                 for (j=i+1; j<psl->sl_count; j++)
 394                         psl->sl_addr[j-1] = psl->sl_addr[j];
 395                 psl->sl_count--;
 396                 err = 0;
 397                 goto done;
 398         }
 399         /* else, add a new source to the filter */
 400
 401         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 402                 err = -ENOBUFS;
 403                 goto done;
 404         }
 405         if (!psl || psl->sl_count == psl->sl_max) {
 406                 struct ip6_sf_socklist *newpsl;
 407                 int count = IP6_SFBLOCK;
 408
 409                 if (psl)
 410                         count += psl->sl_max;
 411                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 412                 if (!newpsl) {
 413                         err = -ENOBUFS;
 414                         goto done;
 415                 }
 416                 newpsl->sl_max = count;
 417                 newpsl->sl_count = count - IP6_SFBLOCK;
 418                 if (psl) {
 419                         for (i=0; i<psl->sl_count; i++)
 420                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 421                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 422                 }
 423                 pmc->sflist = psl = newpsl;
 424         }
 425         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 426         for (i=0; i<psl->sl_count; i++) {
 427                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 428                 if (rv == 0)
 429                         break;
 430         }
 431         if (rv == 0)            /* address already there is an error */
 432                 goto done;
 433         for (j=psl->sl_count-1; j>=i; j--)
 434                 psl->sl_addr[j+1] = psl->sl_addr[j];
 435         psl->sl_addr[i] = *source;
 436         psl->sl_count++;
 437         err = 0;
 438         /* update the interface list */
 439         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 440 done:
 441         if (pmclocked)
 442                 write_unlock(&pmc->sflock);
 443         read_unlock_bh(&idev->lock);
 444         rcu_read_unlock();
 445         if (leavegroup)
 446                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 447         return err;
 448 }
 449
 450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 451 {
 452         const struct in6_addr *group;
 453         struct ipv6_mc_socklist *pmc;
 454         struct inet6_dev *idev;
 455         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 456         struct ip6_sf_socklist *newpsl, *psl;
 457         struct net *net = sock_net(sk);
 458         int leavegroup = 0;
 459         int i, err;
 460
 461         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 462
 463         if (!ipv6_addr_is_multicast(group))
 464                 return -EINVAL;
 465         if (gsf->gf_fmode != MCAST_INCLUDE &&
 466             gsf->gf_fmode != MCAST_EXCLUDE)
 467                 return -EINVAL;
 468
 469         rcu_read_lock();
 470         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 471
 472         if (!idev) {
 473                 rcu_read_unlock();
 474                 return -ENODEV;
 475         }
 476
 477         err = 0;
 478
 479         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 480                 leavegroup = 1;
 481                 goto done;
 482         }
 483
 484         for_each_pmc_rcu(inet6, pmc) {
 485                 if (pmc->ifindex != gsf->gf_interface)
 486                         continue;
 487                 if (ipv6_addr_equal(&pmc->addr, group))
 488                         break;
 489         }
 490         if (!pmc) {             /* must have a prior join */
 491                 err = -EINVAL;
 492                 goto done;
 493         }
 494         if (gsf->gf_numsrc) {
 495                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 496                                                           GFP_ATOMIC);
 497                 if (!newpsl) {
 498                         err = -ENOBUFS;
 499                         goto done;
 500                 }
 501                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 502                 for (i=0; i<newpsl->sl_count; ++i) {
 503                         struct sockaddr_in6 *psin6;
 504
 505                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 506                         newpsl->sl_addr[i] = psin6->sin6_addr;
 507                 }
 508                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 509                         newpsl->sl_count, newpsl->sl_addr, 0);
 510                 if (err) {
 511                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 512                         goto done;
 513                 }
 514         } else {
 515                 newpsl = NULL;
 516                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 517         }
 518
 519         write_lock(&pmc->sflock);
 520         psl = pmc->sflist;
 521         if (psl) {
 522                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 523                         psl->sl_count, psl->sl_addr, 0);
 524                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 525         } else
 526                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 527         pmc->sflist = newpsl;
 528         pmc->sfmode = gsf->gf_fmode;
 529         write_unlock(&pmc->sflock);
 530         err = 0;
 531 done:
 532         read_unlock_bh(&idev->lock);
 533         rcu_read_unlock();
 534         if (leavegroup)
 535                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 536         return err;
 537 }
 538
 539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 540         struct group_filter __user *optval, int __user *optlen)
 541 {
 542         int err, i, count, copycount;
 543         const struct in6_addr *group;
 544         struct ipv6_mc_socklist *pmc;
 545         struct inet6_dev *idev;
 546         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 547         struct ip6_sf_socklist *psl;
 548         struct net *net = sock_net(sk);
 549
 550         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 551
 552         if (!ipv6_addr_is_multicast(group))
 553                 return -EINVAL;
 554
 555         rcu_read_lock();
 556         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 557
 558         if (!idev) {
 559                 rcu_read_unlock();
 560                 return -ENODEV;
 561         }
 562
 563         err = -EADDRNOTAVAIL;
 564         /*
 565          * changes to the ipv6_mc_list require the socket lock and
 566          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 567          * so reading the list is safe.
 568          */
 569
 570         for_each_pmc_rcu(inet6, pmc) {
 571                 if (pmc->ifindex != gsf->gf_interface)
 572                         continue;
 573                 if (ipv6_addr_equal(group, &pmc->addr))
 574                         break;
 575         }
 576         if (!pmc)               /* must have a prior join */
 577                 goto done;
 578         gsf->gf_fmode = pmc->sfmode;
 579         psl = pmc->sflist;
 580         count = psl ? psl->sl_count : 0;
 581         read_unlock_bh(&idev->lock);
 582         rcu_read_unlock();
 583
 584         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 585         gsf->gf_numsrc = count;
 586         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 587             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 588                 return -EFAULT;
 589         }
 590         /* changes to psl require the socket lock, a read lock on
 591          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 592          * have the socket lock, so reading here is safe.
 593          */
 594         for (i=0; i<copycount; i++) {
 595                 struct sockaddr_in6 *psin6;
 596                 struct sockaddr_storage ss;
 597
 598                 psin6 = (struct sockaddr_in6 *)&ss;
 599                 memset(&ss, 0, sizeof(ss));
 600                 psin6->sin6_family = AF_INET6;
 601                 psin6->sin6_addr = psl->sl_addr[i];
 602                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 603                         return -EFAULT;
 604         }
 605         return 0;
 606 done:
 607         read_unlock_bh(&idev->lock);
 608         rcu_read_unlock();
 609         return err;
 610 }
 611
 612 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 613                     const struct in6_addr *src_addr)
 614 {
 615         struct ipv6_pinfo *np = inet6_sk(sk);
 616         struct ipv6_mc_socklist *mc;
 617         struct ip6_sf_socklist *psl;
 618         bool rv = true;
 619
 620         rcu_read_lock();
 621         for_each_pmc_rcu(np, mc) {
 622                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 623                         break;
 624         }
 625         if (!mc) {
 626                 rcu_read_unlock();
 627                 return true;
 628         }
 629         read_lock(&mc->sflock);
 630         psl = mc->sflist;
 631         if (!psl) {
 632                 rv = mc->sfmode == MCAST_EXCLUDE;
 633         } else {
 634                 int i;
 635
 636                 for (i=0; i<psl->sl_count; i++) {
 637                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 638                                 break;
 639                 }
 640                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 641                         rv = false;
 642                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 643                         rv = false;
 644         }
 645         read_unlock(&mc->sflock);
 646         rcu_read_unlock();
 647
 648         return rv;
 649 }
 650
 651 static void ma_put(struct ifmcaddr6 *mc)
 652 {
 653         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 654                 in6_dev_put(mc->idev);
 655                 kfree(mc);
 656         }
 657 }
 658
 659 static void igmp6_group_added(struct ifmcaddr6 *mc)
 660 {
 661         struct net_device *dev = mc->idev->dev;
 662         char buf[MAX_ADDR_LEN];
 663
 664         spin_lock_bh(&mc->mca_lock);
 665         if (!(mc->mca_flags&MAF_LOADED)) {
 666                 mc->mca_flags |= MAF_LOADED;
 667                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 668                         dev_mc_add(dev, buf);
 669         }
 670         spin_unlock_bh(&mc->mca_lock);
 671
 672         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 673                 return;
 674
 675         if (MLD_V1_SEEN(mc->idev)) {
 676                 igmp6_join_group(mc);
 677                 return;
 678         }
 679         /* else v2 */
 680
 681         mc->mca_crcount = mc->idev->mc_qrv;
 682         mld_ifc_event(mc->idev);
 683 }
 684
 685 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 686 {
 687         struct net_device *dev = mc->idev->dev;
 688         char buf[MAX_ADDR_LEN];
 689
 690         spin_lock_bh(&mc->mca_lock);
 691         if (mc->mca_flags&MAF_LOADED) {
 692                 mc->mca_flags &= ~MAF_LOADED;
 693                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 694                         dev_mc_del(dev, buf);
 695         }
 696
 697         if (mc->mca_flags & MAF_NOREPORT)
 698                 goto done;
 699         spin_unlock_bh(&mc->mca_lock);
 700
 701         if (!mc->idev->dead)
 702                 igmp6_leave_group(mc);
 703
 704         spin_lock_bh(&mc->mca_lock);
 705         if (del_timer(&mc->mca_timer))
 706                 atomic_dec(&mc->mca_refcnt);
 707 done:
 708         ip6_mc_clear_src(mc);
 709         spin_unlock_bh(&mc->mca_lock);
 710 }
 711
 712 /*
 713  * deleted ifmcaddr6 manipulation
 714  */
 715 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 716 {
 717         struct ifmcaddr6 *pmc;
 718
 719         /* this is an "ifmcaddr6" for convenience; only the fields below
 720          * are actually used. In particular, the refcnt and users are not
 721          * used for management of the delete list. Using the same structure
 722          * for deleted items allows change reports to use common code with
 723          * non-deleted or query-response MCA's.
 724          */
 725         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 726         if (!pmc)
 727                 return;
 728
 729         spin_lock_bh(&im->mca_lock);
 730         spin_lock_init(&pmc->mca_lock);
 731         pmc->idev = im->idev;
 732         in6_dev_hold(idev);
 733         pmc->mca_addr = im->mca_addr;
 734         pmc->mca_crcount = idev->mc_qrv;
 735         pmc->mca_sfmode = im->mca_sfmode;
 736         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 737                 struct ip6_sf_list *psf;
 738
 739                 pmc->mca_tomb = im->mca_tomb;
 740                 pmc->mca_sources = im->mca_sources;
 741                 im->mca_tomb = im->mca_sources = NULL;
 742                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 743                         psf->sf_crcount = pmc->mca_crcount;
 744         }
 745         spin_unlock_bh(&im->mca_lock);
 746
 747         spin_lock_bh(&idev->mc_lock);
 748         pmc->next = idev->mc_tomb;
 749         idev->mc_tomb = pmc;
 750         spin_unlock_bh(&idev->mc_lock);
 751 }
 752
 753 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 754 {
 755         struct ifmcaddr6 *pmc, *pmc_prev;
 756         struct ip6_sf_list *psf, *psf_next;
 757
 758         spin_lock_bh(&idev->mc_lock);
 759         pmc_prev = NULL;
 760         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 761                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 762                         break;
 763                 pmc_prev = pmc;
 764         }
 765         if (pmc) {
 766                 if (pmc_prev)
 767                         pmc_prev->next = pmc->next;
 768                 else
 769                         idev->mc_tomb = pmc->next;
 770         }
 771         spin_unlock_bh(&idev->mc_lock);
 772
 773         if (pmc) {
 774                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 775                         psf_next = psf->sf_next;
 776                         kfree(psf);
 777                 }
 778                 in6_dev_put(pmc->idev);
 779                 kfree(pmc);
 780         }
 781 }
 782
 783 static void mld_clear_delrec(struct inet6_dev *idev)
 784 {
 785         struct ifmcaddr6 *pmc, *nextpmc;
 786
 787         spin_lock_bh(&idev->mc_lock);
 788         pmc = idev->mc_tomb;
 789         idev->mc_tomb = NULL;
 790         spin_unlock_bh(&idev->mc_lock);
 791
 792         for (; pmc; pmc = nextpmc) {
 793                 nextpmc = pmc->next;
 794                 ip6_mc_clear_src(pmc);
 795                 in6_dev_put(pmc->idev);
 796                 kfree(pmc);
 797         }
 798
 799         /* clear dead sources, too */
 800         read_lock_bh(&idev->lock);
 801         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 802                 struct ip6_sf_list *psf, *psf_next;
 803
 804                 spin_lock_bh(&pmc->mca_lock);
 805                 psf = pmc->mca_tomb;
 806                 pmc->mca_tomb = NULL;
 807                 spin_unlock_bh(&pmc->mca_lock);
 808                 for (; psf; psf=psf_next) {
 809                         psf_next = psf->sf_next;
 810                         kfree(psf);
 811                 }
 812         }
 813         read_unlock_bh(&idev->lock);
 814 }
 815
 816
 817 /*
 818  *      device multicast group inc (add if not found)
 819  */
 820 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 821 {
 822         struct ifmcaddr6 *mc;
 823         struct inet6_dev *idev;
 824
 825         /* we need to take a reference on idev */
 826         idev = in6_dev_get(dev);
 827
 828         if (idev == NULL)
 829                 return -EINVAL;
 830
 831         write_lock_bh(&idev->lock);
 832         if (idev->dead) {
 833                 write_unlock_bh(&idev->lock);
 834                 in6_dev_put(idev);
 835                 return -ENODEV;
 836         }
 837
 838         for (mc = idev->mc_list; mc; mc = mc->next) {
 839                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 840                         mc->mca_users++;
 841                         write_unlock_bh(&idev->lock);
 842                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 843                                 NULL, 0);
 844                         in6_dev_put(idev);
 845                         return 0;
 846                 }
 847         }
 848
 849         /*
 850          *      not found: create a new one.
 851          */
 852
 853         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 854
 855         if (mc == NULL) {
 856                 write_unlock_bh(&idev->lock);
 857                 in6_dev_put(idev);
 858                 return -ENOMEM;
 859         }
 860
 861         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 862
 863         mc->mca_addr = *addr;
 864         mc->idev = idev; /* (reference taken) */
 865         mc->mca_users = 1;
 866         /* mca_stamp should be updated upon changes */
 867         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 868         atomic_set(&mc->mca_refcnt, 2);
 869         spin_lock_init(&mc->mca_lock);
 870
 871         /* initial mode is (EX, empty) */
 872         mc->mca_sfmode = MCAST_EXCLUDE;
 873         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 874
 875         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 876             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 877                 mc->mca_flags |= MAF_NOREPORT;
 878
 879         mc->next = idev->mc_list;
 880         idev->mc_list = mc;
 881         write_unlock_bh(&idev->lock);
 882
 883         mld_del_delrec(idev, &mc->mca_addr);
 884         igmp6_group_added(mc);
 885         ma_put(mc);
 886         return 0;
 887 }
 888
 889 /*
 890  *      device multicast group del
 891  */
 892 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 893 {
 894         struct ifmcaddr6 *ma, **map;
 895
 896         write_lock_bh(&idev->lock);
 897         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 898                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 899                         if (--ma->mca_users == 0) {
 900                                 *map = ma->next;
 901                                 write_unlock_bh(&idev->lock);
 902
 903                                 igmp6_group_dropped(ma);
 904
 905                                 ma_put(ma);
 906                                 return 0;
 907                         }
 908                         write_unlock_bh(&idev->lock);
 909                         return 0;
 910                 }
 911         }
 912         write_unlock_bh(&idev->lock);
 913
 914         return -ENOENT;
 915 }
 916
 917 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 918 {
 919         struct inet6_dev *idev;
 920         int err;
 921
 922         rcu_read_lock();
 923
 924         idev = __in6_dev_get(dev);
 925         if (!idev)
 926                 err = -ENODEV;
 927         else
 928                 err = __ipv6_dev_mc_dec(idev, addr);
 929
 930         rcu_read_unlock();
 931         return err;
 932 }
 933
 934 /*
 935  * identify MLD packets for MLD filter exceptions
 936  */
 937 bool ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 938 {
 939         struct icmp6hdr *pic;
 940
 941         if (nexthdr != IPPROTO_ICMPV6)
 942                 return false;
 943
 944         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 945                 return false;
 946
 947         pic = icmp6_hdr(skb);
 948
 949         switch (pic->icmp6_type) {
 950         case ICMPV6_MGM_QUERY:
 951         case ICMPV6_MGM_REPORT:
 952         case ICMPV6_MGM_REDUCTION:
 953         case ICMPV6_MLD2_REPORT:
 954                 return true;
 955         default:
 956                 break;
 957         }
 958         return false;
 959 }
 960
 961 /*
 962  *      check if the interface/address pair is valid
 963  */
 964 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 965                          const struct in6_addr *src_addr)
 966 {
 967         struct inet6_dev *idev;
 968         struct ifmcaddr6 *mc;
 969         bool rv = false;
 970
 971         rcu_read_lock();
 972         idev = __in6_dev_get(dev);
 973         if (idev) {
 974                 read_lock_bh(&idev->lock);
 975                 for (mc = idev->mc_list; mc; mc=mc->next) {
 976                         if (ipv6_addr_equal(&mc->mca_addr, group))
 977                                 break;
 978                 }
 979                 if (mc) {
 980                         if (src_addr && !ipv6_addr_any(src_addr)) {
 981                                 struct ip6_sf_list *psf;
 982
 983                                 spin_lock_bh(&mc->mca_lock);
 984                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 985                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 986                                                 break;
 987                                 }
 988                                 if (psf)
 989                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 990                                                 psf->sf_count[MCAST_EXCLUDE] !=
 991                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 992                                 else
 993                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 994                                 spin_unlock_bh(&mc->mca_lock);
 995                         } else
 996                                 rv = true; /* don't filter unspecified source */
 997                 }
 998                 read_unlock_bh(&idev->lock);
 999         }
1000         rcu_read_unlock();
1001         return rv;
1002 }
1003
1004 static void mld_gq_start_timer(struct inet6_dev *idev)
1005 {
1006         int tv = net_random() % idev->mc_maxdelay;
1007
1008         idev->mc_gq_running = 1;
1009         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1010                 in6_dev_hold(idev);
1011 }
1012
1013 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1014 {
1015         int tv = net_random() % delay;
1016
1017         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1018                 in6_dev_hold(idev);
1019 }
1020
1021 /*
1022  *      IGMP handling (alias multicast ICMPv6 messages)
1023  */
1024
1025 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1026 {
1027         unsigned long delay = resptime;
1028
1029         /* Do not start timer for these addresses */
1030         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1031             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1032                 return;
1033
1034         if (del_timer(&ma->mca_timer)) {
1035                 atomic_dec(&ma->mca_refcnt);
1036                 delay = ma->mca_timer.expires - jiffies;
1037         }
1038
1039         if (delay >= resptime) {
1040                 if (resptime)
1041                         delay = net_random() % resptime;
1042                 else
1043                         delay = 1;
1044         }
1045         ma->mca_timer.expires = jiffies + delay;
1046         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1047                 atomic_inc(&ma->mca_refcnt);
1048         ma->mca_flags |= MAF_TIMER_RUNNING;
1049 }
1050
1051 /* mark EXCLUDE-mode sources */
1052 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1053                              const struct in6_addr *srcs)
1054 {
1055         struct ip6_sf_list *psf;
1056         int i, scount;
1057
1058         scount = 0;
1059         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1060                 if (scount == nsrcs)
1061                         break;
1062                 for (i=0; i<nsrcs; i++) {
1063                         /* skip inactive filters */
1064                         if (psf->sf_count[MCAST_INCLUDE] ||
1065                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1066                             psf->sf_count[MCAST_EXCLUDE])
1067                                 break;
1068                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1069                                 scount++;
1070                                 break;
1071                         }
1072                 }
1073         }
1074         pmc->mca_flags &= ~MAF_GSQUERY;
1075         if (scount == nsrcs)    /* all sources excluded */
1076                 return false;
1077         return true;
1078 }
1079
1080 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1081                             const struct in6_addr *srcs)
1082 {
1083         struct ip6_sf_list *psf;
1084         int i, scount;
1085
1086         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1087                 return mld_xmarksources(pmc, nsrcs, srcs);
1088
1089         /* mark INCLUDE-mode sources */
1090
1091         scount = 0;
1092         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1093                 if (scount == nsrcs)
1094                         break;
1095                 for (i=0; i<nsrcs; i++) {
1096                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1097                                 psf->sf_gsresp = 1;
1098                                 scount++;
1099                                 break;
1100                         }
1101                 }
1102         }
1103         if (!scount) {
1104                 pmc->mca_flags &= ~MAF_GSQUERY;
1105                 return false;
1106         }
1107         pmc->mca_flags |= MAF_GSQUERY;
1108         return true;
1109 }
1110
1111 /* called with rcu_read_lock() */
1112 int igmp6_event_query(struct sk_buff *skb)
1113 {
1114         struct mld2_query *mlh2 = NULL;
1115         struct ifmcaddr6 *ma;
1116         const struct in6_addr *group;
1117         unsigned long max_delay;
1118         struct inet6_dev *idev;
1119         struct mld_msg *mld;
1120         int group_type;
1121         int mark = 0;
1122         int len;
1123
1124         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1125                 return -EINVAL;
1126
1127         /* compute payload length excluding extension headers */
1128         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1129         len -= skb_network_header_len(skb);
1130
1131         /* Drop queries with not link local source */
1132         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1133                 return -EINVAL;
1134
1135         idev = __in6_dev_get(skb->dev);
1136
1137         if (idev == NULL)
1138                 return 0;
1139
1140         mld = (struct mld_msg *)icmp6_hdr(skb);
1141         group = &mld->mld_mca;
1142         group_type = ipv6_addr_type(group);
1143
1144         if (group_type != IPV6_ADDR_ANY &&
1145             !(group_type&IPV6_ADDR_MULTICAST))
1146                 return -EINVAL;
1147
1148         if (len == 24) {
1149                 int switchback;
1150                 /* MLDv1 router present */
1151
1152                 /* Translate milliseconds to jiffies */
1153                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1154
1155                 switchback = (idev->mc_qrv + 1) * max_delay;
1156                 idev->mc_v1_seen = jiffies + switchback;
1157
1158                 /* cancel the interface change timer */
1159                 idev->mc_ifc_count = 0;
1160                 if (del_timer(&idev->mc_ifc_timer))
1161                         __in6_dev_put(idev);
1162                 /* clear deleted report items */
1163                 mld_clear_delrec(idev);
1164         } else if (len >= 28) {
1165                 int srcs_offset = sizeof(struct mld2_query) -
1166                                   sizeof(struct icmp6hdr);
1167                 if (!pskb_may_pull(skb, srcs_offset))
1168                         return -EINVAL;
1169
1170                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1171                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1172                 if (!max_delay)
1173                         max_delay = 1;
1174                 idev->mc_maxdelay = max_delay;
1175                 if (mlh2->mld2q_qrv)
1176                         idev->mc_qrv = mlh2->mld2q_qrv;
1177                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1178                         if (mlh2->mld2q_nsrcs)
1179                                 return -EINVAL; /* no sources allowed */
1180
1181                         mld_gq_start_timer(idev);
1182                         return 0;
1183                 }
1184                 /* mark sources to include, if group & source-specific */
1185                 if (mlh2->mld2q_nsrcs != 0) {
1186                         if (!pskb_may_pull(skb, srcs_offset +
1187                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1188                                 return -EINVAL;
1189
1190                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1191                         mark = 1;
1192                 }
1193         } else
1194                 return -EINVAL;
1195
1196         read_lock_bh(&idev->lock);
1197         if (group_type == IPV6_ADDR_ANY) {
1198                 for (ma = idev->mc_list; ma; ma=ma->next) {
1199                         spin_lock_bh(&ma->mca_lock);
1200                         igmp6_group_queried(ma, max_delay);
1201                         spin_unlock_bh(&ma->mca_lock);
1202                 }
1203         } else {
1204                 for (ma = idev->mc_list; ma; ma=ma->next) {
1205                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1206                                 continue;
1207                         spin_lock_bh(&ma->mca_lock);
1208                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1209                                 /* gsquery <- gsquery && mark */
1210                                 if (!mark)
1211                                         ma->mca_flags &= ~MAF_GSQUERY;
1212                         } else {
1213                                 /* gsquery <- mark */
1214                                 if (mark)
1215                                         ma->mca_flags |= MAF_GSQUERY;
1216                                 else
1217                                         ma->mca_flags &= ~MAF_GSQUERY;
1218                         }
1219                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1220                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1221                                 igmp6_group_queried(ma, max_delay);
1222                         spin_unlock_bh(&ma->mca_lock);
1223                         break;
1224                 }
1225         }
1226         read_unlock_bh(&idev->lock);
1227
1228         return 0;
1229 }
1230
1231 /* called with rcu_read_lock() */
1232 int igmp6_event_report(struct sk_buff *skb)
1233 {
1234         struct ifmcaddr6 *ma;
1235         struct inet6_dev *idev;
1236         struct mld_msg *mld;
1237         int addr_type;
1238
1239         /* Our own report looped back. Ignore it. */
1240         if (skb->pkt_type == PACKET_LOOPBACK)
1241                 return 0;
1242
1243         /* send our report if the MC router may not have heard this report */
1244         if (skb->pkt_type != PACKET_MULTICAST &&
1245             skb->pkt_type != PACKET_BROADCAST)
1246                 return 0;
1247
1248         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1249                 return -EINVAL;
1250
1251         mld = (struct mld_msg *)icmp6_hdr(skb);
1252
1253         /* Drop reports with not link local source */
1254         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1255         if (addr_type != IPV6_ADDR_ANY &&
1256             !(addr_type&IPV6_ADDR_LINKLOCAL))
1257                 return -EINVAL;
1258
1259         idev = __in6_dev_get(skb->dev);
1260         if (idev == NULL)
1261                 return -ENODEV;
1262
1263         /*
1264          *      Cancel the timer for this group
1265          */
1266
1267         read_lock_bh(&idev->lock);
1268         for (ma = idev->mc_list; ma; ma=ma->next) {
1269                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1270                         spin_lock(&ma->mca_lock);
1271                         if (del_timer(&ma->mca_timer))
1272                                 atomic_dec(&ma->mca_refcnt);
1273                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1274                         spin_unlock(&ma->mca_lock);
1275                         break;
1276                 }
1277         }
1278         read_unlock_bh(&idev->lock);
1279         return 0;
1280 }
1281
1282 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1283                   int gdeleted, int sdeleted)
1284 {
1285         switch (type) {
1286         case MLD2_MODE_IS_INCLUDE:
1287         case MLD2_MODE_IS_EXCLUDE:
1288                 if (gdeleted || sdeleted)
1289                         return false;
1290                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1291                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1292                                 return true;
1293                         /* don't include if this source is excluded
1294                          * in all filters
1295                          */
1296                         if (psf->sf_count[MCAST_INCLUDE])
1297                                 return type == MLD2_MODE_IS_INCLUDE;
1298                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1299                                 psf->sf_count[MCAST_EXCLUDE];
1300                 }
1301                 return false;
1302         case MLD2_CHANGE_TO_INCLUDE:
1303                 if (gdeleted || sdeleted)
1304                         return false;
1305                 return psf->sf_count[MCAST_INCLUDE] != 0;
1306         case MLD2_CHANGE_TO_EXCLUDE:
1307                 if (gdeleted || sdeleted)
1308                         return false;
1309                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1310                     psf->sf_count[MCAST_INCLUDE])
1311                         return false;
1312                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1313                         psf->sf_count[MCAST_EXCLUDE];
1314         case MLD2_ALLOW_NEW_SOURCES:
1315                 if (gdeleted || !psf->sf_crcount)
1316                         return false;
1317                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1318         case MLD2_BLOCK_OLD_SOURCES:
1319                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1320                         return gdeleted || (psf->sf_crcount && sdeleted);
1321                 return psf->sf_crcount && !gdeleted && !sdeleted;
1322         }
1323         return false;
1324 }
1325
1326 static int
1327 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1328 {
1329         struct ip6_sf_list *psf;
1330         int scount = 0;
1331
1332         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1333                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1334                         continue;
1335                 scount++;
1336         }
1337         return scount;
1338 }
1339
1340 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1341 {
1342         struct net *net = dev_net(dev);
1343         struct sock *sk = net->ipv6.igmp_sk;
1344         struct sk_buff *skb;
1345         struct mld2_report *pmr;
1346         struct in6_addr addr_buf;
1347         const struct in6_addr *saddr;
1348         int hlen = LL_RESERVED_SPACE(dev);
1349         int tlen = dev->needed_tailroom;
1350         int err;
1351         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1352                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1353                      IPV6_TLV_PADN, 0 };
1354
1355         /* we assume size > sizeof(ra) here */
1356         size += hlen + tlen;
1357         /* limit our allocations to order-0 page */
1358         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1359         skb = sock_alloc_send_skb(sk, size, 1, &err);
1360
1361         if (!skb)
1362                 return NULL;
1363
1364         skb_reserve(skb, hlen);
1365
1366         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1367                 /* <draft-ietf-magma-mld-source-05.txt>:
1368                  * use unspecified address as the source address
1369                  * when a valid link-local address is not available.
1370                  */
1371                 saddr = &in6addr_any;
1372         } else
1373                 saddr = &addr_buf;
1374
1375         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1376
1377         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1378
1379         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1380         skb_put(skb, sizeof(*pmr));
1381         pmr = (struct mld2_report *)skb_transport_header(skb);
1382         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1383         pmr->mld2r_resv1 = 0;
1384         pmr->mld2r_cksum = 0;
1385         pmr->mld2r_resv2 = 0;
1386         pmr->mld2r_ngrec = 0;
1387         return skb;
1388 }
1389
1390 static void mld_sendpack(struct sk_buff *skb)
1391 {
1392         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1393         struct mld2_report *pmr =
1394                               (struct mld2_report *)skb_transport_header(skb);
1395         int payload_len, mldlen;
1396         struct inet6_dev *idev;
1397         struct net *net = dev_net(skb->dev);
1398         int err;
1399         struct flowi6 fl6;
1400         struct dst_entry *dst;
1401
1402         rcu_read_lock();
1403         idev = __in6_dev_get(skb->dev);
1404         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1405
1406         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1407         mldlen = skb->tail - skb->transport_header;
1408         pip6->payload_len = htons(payload_len);
1409
1410         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1411                                            IPPROTO_ICMPV6,
1412                                            csum_partial(skb_transport_header(skb),
1413                                                         mldlen, 0));
1414
1415         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1416                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1417                          skb->dev->ifindex);
1418         dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1419
1420         err = 0;
1421         if (IS_ERR(dst)) {
1422                 err = PTR_ERR(dst);
1423                 dst = NULL;
1424         }
1425         skb_dst_set(skb, dst);
1426         if (err)
1427                 goto err_out;
1428
1429         payload_len = skb->len;
1430
1431         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1432                       dst_output);
1433 out:
1434         if (!err) {
1435                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1436                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1437                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1438         } else
1439                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1440
1441         rcu_read_unlock();
1442         return;
1443
1444 err_out:
1445         kfree_skb(skb);
1446         goto out;
1447 }
1448
1449 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1450 {
1451         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1452 }
1453
1454 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1455         int type, struct mld2_grec **ppgr)
1456 {
1457         struct net_device *dev = pmc->idev->dev;
1458         struct mld2_report *pmr;
1459         struct mld2_grec *pgr;
1460
1461         if (!skb)
1462                 skb = mld_newpack(dev, dev->mtu);
1463         if (!skb)
1464                 return NULL;
1465         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1466         pgr->grec_type = type;
1467         pgr->grec_auxwords = 0;
1468         pgr->grec_nsrcs = 0;
1469         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1470         pmr = (struct mld2_report *)skb_transport_header(skb);
1471         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1472         *ppgr = pgr;
1473         return skb;
1474 }
1475
1476 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1477         skb_tailroom(skb)) : 0)
1478
1479 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1480         int type, int gdeleted, int sdeleted)
1481 {
1482         struct net_device *dev = pmc->idev->dev;
1483         struct mld2_report *pmr;
1484         struct mld2_grec *pgr = NULL;
1485         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1486         int scount, stotal, first, isquery, truncate;
1487
1488         if (pmc->mca_flags & MAF_NOREPORT)
1489                 return skb;
1490
1491         isquery = type == MLD2_MODE_IS_INCLUDE ||
1492                   type == MLD2_MODE_IS_EXCLUDE;
1493         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1494                     type == MLD2_CHANGE_TO_EXCLUDE;
1495
1496         stotal = scount = 0;
1497
1498         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1499
1500         if (!*psf_list)
1501                 goto empty_source;
1502
1503         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1504
1505         /* EX and TO_EX get a fresh packet, if needed */
1506         if (truncate) {
1507                 if (pmr && pmr->mld2r_ngrec &&
1508                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1509                         if (skb)
1510                                 mld_sendpack(skb);
1511                         skb = mld_newpack(dev, dev->mtu);
1512                 }
1513         }
1514         first = 1;
1515         psf_prev = NULL;
1516         for (psf=*psf_list; psf; psf=psf_next) {
1517                 struct in6_addr *psrc;
1518
1519                 psf_next = psf->sf_next;
1520
1521                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1522                         psf_prev = psf;
1523                         continue;
1524                 }
1525
1526                 /* clear marks on query responses */
1527                 if (isquery)
1528                         psf->sf_gsresp = 0;
1529
1530                 if (AVAILABLE(skb) < sizeof(*psrc) +
1531                     first*sizeof(struct mld2_grec)) {
1532                         if (truncate && !first)
1533                                 break;   /* truncate these */
1534                         if (pgr)
1535                                 pgr->grec_nsrcs = htons(scount);
1536                         if (skb)
1537                                 mld_sendpack(skb);
1538                         skb = mld_newpack(dev, dev->mtu);
1539                         first = 1;
1540                         scount = 0;
1541                 }
1542                 if (first) {
1543                         skb = add_grhead(skb, pmc, type, &pgr);
1544                         first = 0;
1545                 }
1546                 if (!skb)
1547                         return NULL;
1548                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1549                 *psrc = psf->sf_addr;
1550                 scount++; stotal++;
1551                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1552                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1553                         psf->sf_crcount--;
1554                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1555                                 if (psf_prev)
1556                                         psf_prev->sf_next = psf->sf_next;
1557                                 else
1558                                         *psf_list = psf->sf_next;
1559                                 kfree(psf);
1560                                 continue;
1561                         }
1562                 }
1563                 psf_prev = psf;
1564         }
1565
1566 empty_source:
1567         if (!stotal) {
1568                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1569                     type == MLD2_BLOCK_OLD_SOURCES)
1570                         return skb;
1571                 if (pmc->mca_crcount || isquery) {
1572                         /* make sure we have room for group header */
1573                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1574                                 mld_sendpack(skb);
1575                                 skb = NULL; /* add_grhead will get a new one */
1576                         }
1577                         skb = add_grhead(skb, pmc, type, &pgr);
1578                 }
1579         }
1580         if (pgr)
1581                 pgr->grec_nsrcs = htons(scount);
1582
1583         if (isquery)
1584                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1585         return skb;
1586 }
1587
1588 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1589 {
1590         struct sk_buff *skb = NULL;
1591         int type;
1592
1593         if (!pmc) {
1594                 read_lock_bh(&idev->lock);
1595                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1596                         if (pmc->mca_flags & MAF_NOREPORT)
1597                                 continue;
1598                         spin_lock_bh(&pmc->mca_lock);
1599                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1600                                 type = MLD2_MODE_IS_EXCLUDE;
1601                         else
1602                                 type = MLD2_MODE_IS_INCLUDE;
1603                         skb = add_grec(skb, pmc, type, 0, 0);
1604                         spin_unlock_bh(&pmc->mca_lock);
1605                 }
1606                 read_unlock_bh(&idev->lock);
1607         } else {
1608                 spin_lock_bh(&pmc->mca_lock);
1609                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1610                         type = MLD2_MODE_IS_EXCLUDE;
1611                 else
1612                         type = MLD2_MODE_IS_INCLUDE;
1613                 skb = add_grec(skb, pmc, type, 0, 0);
1614                 spin_unlock_bh(&pmc->mca_lock);
1615         }
1616         if (skb)
1617                 mld_sendpack(skb);
1618 }
1619
1620 /*
1621  * remove zero-count source records from a source filter list
1622  */
1623 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1624 {
1625         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1626
1627         psf_prev = NULL;
1628         for (psf=*ppsf; psf; psf = psf_next) {
1629                 psf_next = psf->sf_next;
1630                 if (psf->sf_crcount == 0) {
1631                         if (psf_prev)
1632                                 psf_prev->sf_next = psf->sf_next;
1633                         else
1634                                 *ppsf = psf->sf_next;
1635                         kfree(psf);
1636                 } else
1637                         psf_prev = psf;
1638         }
1639 }
1640
1641 static void mld_send_cr(struct inet6_dev *idev)
1642 {
1643         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1644         struct sk_buff *skb = NULL;
1645         int type, dtype;
1646
1647         read_lock_bh(&idev->lock);
1648         spin_lock(&idev->mc_lock);
1649
1650         /* deleted MCA's */
1651         pmc_prev = NULL;
1652         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1653                 pmc_next = pmc->next;
1654                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1655                         type = MLD2_BLOCK_OLD_SOURCES;
1656                         dtype = MLD2_BLOCK_OLD_SOURCES;
1657                         skb = add_grec(skb, pmc, type, 1, 0);
1658                         skb = add_grec(skb, pmc, dtype, 1, 1);
1659                 }
1660                 if (pmc->mca_crcount) {
1661                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1662                                 type = MLD2_CHANGE_TO_INCLUDE;
1663                                 skb = add_grec(skb, pmc, type, 1, 0);
1664                         }
1665                         pmc->mca_crcount--;
1666                         if (pmc->mca_crcount == 0) {
1667                                 mld_clear_zeros(&pmc->mca_tomb);
1668                                 mld_clear_zeros(&pmc->mca_sources);
1669                         }
1670                 }
1671                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1672                     !pmc->mca_sources) {
1673                         if (pmc_prev)
1674                                 pmc_prev->next = pmc_next;
1675                         else
1676                                 idev->mc_tomb = pmc_next;
1677                         in6_dev_put(pmc->idev);
1678                         kfree(pmc);
1679                 } else
1680                         pmc_prev = pmc;
1681         }
1682         spin_unlock(&idev->mc_lock);
1683
1684         /* change recs */
1685         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1686                 spin_lock_bh(&pmc->mca_lock);
1687                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1688                         type = MLD2_BLOCK_OLD_SOURCES;
1689                         dtype = MLD2_ALLOW_NEW_SOURCES;
1690                 } else {
1691                         type = MLD2_ALLOW_NEW_SOURCES;
1692                         dtype = MLD2_BLOCK_OLD_SOURCES;
1693                 }
1694                 skb = add_grec(skb, pmc, type, 0, 0);
1695                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1696
1697                 /* filter mode changes */
1698                 if (pmc->mca_crcount) {
1699                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1700                                 type = MLD2_CHANGE_TO_EXCLUDE;
1701                         else
1702                                 type = MLD2_CHANGE_TO_INCLUDE;
1703                         skb = add_grec(skb, pmc, type, 0, 0);
1704                         pmc->mca_crcount--;
1705                 }
1706                 spin_unlock_bh(&pmc->mca_lock);
1707         }
1708         read_unlock_bh(&idev->lock);
1709         if (!skb)
1710                 return;
1711         (void) mld_sendpack(skb);
1712 }
1713
1714 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1715 {
1716         struct net *net = dev_net(dev);
1717         struct sock *sk = net->ipv6.igmp_sk;
1718         struct inet6_dev *idev;
1719         struct sk_buff *skb;
1720         struct mld_msg *hdr;
1721         const struct in6_addr *snd_addr, *saddr;
1722         struct in6_addr addr_buf;
1723         int hlen = LL_RESERVED_SPACE(dev);
1724         int tlen = dev->needed_tailroom;
1725         int err, len, payload_len, full_len;
1726         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1727                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1728                      IPV6_TLV_PADN, 0 };
1729         struct flowi6 fl6;
1730         struct dst_entry *dst;
1731
1732         if (type == ICMPV6_MGM_REDUCTION)
1733                 snd_addr = &in6addr_linklocal_allrouters;
1734         else
1735                 snd_addr = addr;
1736
1737         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1738         payload_len = len + sizeof(ra);
1739         full_len = sizeof(struct ipv6hdr) + payload_len;
1740
1741         rcu_read_lock();
1742         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1743                       IPSTATS_MIB_OUT, full_len);
1744         rcu_read_unlock();
1745
1746         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1747
1748         if (skb == NULL) {
1749                 rcu_read_lock();
1750                 IP6_INC_STATS(net, __in6_dev_get(dev),
1751                               IPSTATS_MIB_OUTDISCARDS);
1752                 rcu_read_unlock();
1753                 return;
1754         }
1755
1756         skb_reserve(skb, hlen);
1757
1758         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1759                 /* <draft-ietf-magma-mld-source-05.txt>:
1760                  * use unspecified address as the source address
1761                  * when a valid link-local address is not available.
1762                  */
1763                 saddr = &in6addr_any;
1764         } else
1765                 saddr = &addr_buf;
1766
1767         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1768
1769         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1770
1771         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1772         memset(hdr, 0, sizeof(struct mld_msg));
1773         hdr->mld_type = type;
1774         hdr->mld_mca = *addr;
1775
1776         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1777                                          IPPROTO_ICMPV6,
1778                                          csum_partial(hdr, len, 0));
1779
1780         rcu_read_lock();
1781         idev = __in6_dev_get(skb->dev);
1782
1783         icmpv6_flow_init(sk, &fl6, type,
1784                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1785                          skb->dev->ifindex);
1786         dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1787         if (IS_ERR(dst)) {
1788                 err = PTR_ERR(dst);
1789                 goto err_out;
1790         }
1791
1792         skb_dst_set(skb, dst);
1793         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1794                       dst_output);
1795 out:
1796         if (!err) {
1797                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1798                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1799                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1800         } else
1801                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1802
1803         rcu_read_unlock();
1804         return;
1805
1806 err_out:
1807         kfree_skb(skb);
1808         goto out;
1809 }
1810
1811 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1812         const struct in6_addr *psfsrc)
1813 {
1814         struct ip6_sf_list *psf, *psf_prev;
1815         int rv = 0;
1816
1817         psf_prev = NULL;
1818         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1819                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1820                         break;
1821                 psf_prev = psf;
1822         }
1823         if (!psf || psf->sf_count[sfmode] == 0) {
1824                 /* source filter not found, or count wrong =>  bug */
1825                 return -ESRCH;
1826         }
1827         psf->sf_count[sfmode]--;
1828         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1829                 struct inet6_dev *idev = pmc->idev;
1830
1831                 /* no more filters for this source */
1832                 if (psf_prev)
1833                         psf_prev->sf_next = psf->sf_next;
1834                 else
1835                         pmc->mca_sources = psf->sf_next;
1836                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1837                     !MLD_V1_SEEN(idev)) {
1838                         psf->sf_crcount = idev->mc_qrv;
1839                         psf->sf_next = pmc->mca_tomb;
1840                         pmc->mca_tomb = psf;
1841                         rv = 1;
1842                 } else
1843                         kfree(psf);
1844         }
1845         return rv;
1846 }
1847
1848 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1849                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1850                           int delta)
1851 {
1852         struct ifmcaddr6 *pmc;
1853         int     changerec = 0;
1854         int     i, err;
1855
1856         if (!idev)
1857                 return -ENODEV;
1858         read_lock_bh(&idev->lock);
1859         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1860                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1861                         break;
1862         }
1863         if (!pmc) {
1864                 /* MCA not found?? bug */
1865                 read_unlock_bh(&idev->lock);
1866                 return -ESRCH;
1867         }
1868         spin_lock_bh(&pmc->mca_lock);
1869         sf_markstate(pmc);
1870         if (!delta) {
1871                 if (!pmc->mca_sfcount[sfmode]) {
1872                         spin_unlock_bh(&pmc->mca_lock);
1873                         read_unlock_bh(&idev->lock);
1874                         return -EINVAL;
1875                 }
1876                 pmc->mca_sfcount[sfmode]--;
1877         }
1878         err = 0;
1879         for (i=0; i<sfcount; i++) {
1880                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1881
1882                 changerec |= rv > 0;
1883                 if (!err && rv < 0)
1884                         err = rv;
1885         }
1886         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1887             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1888             pmc->mca_sfcount[MCAST_INCLUDE]) {
1889                 struct ip6_sf_list *psf;
1890
1891                 /* filter mode change */
1892                 pmc->mca_sfmode = MCAST_INCLUDE;
1893                 pmc->mca_crcount = idev->mc_qrv;
1894                 idev->mc_ifc_count = pmc->mca_crcount;
1895                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1896                         psf->sf_crcount = 0;
1897                 mld_ifc_event(pmc->idev);
1898         } else if (sf_setstate(pmc) || changerec)
1899                 mld_ifc_event(pmc->idev);
1900         spin_unlock_bh(&pmc->mca_lock);
1901         read_unlock_bh(&idev->lock);
1902         return err;
1903 }
1904
1905 /*
1906  * Add multicast single-source filter to the interface list
1907  */
1908 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1909         const struct in6_addr *psfsrc)
1910 {
1911         struct ip6_sf_list *psf, *psf_prev;
1912
1913         psf_prev = NULL;
1914         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1915                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1916                         break;
1917                 psf_prev = psf;
1918         }
1919         if (!psf) {
1920                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1921                 if (!psf)
1922                         return -ENOBUFS;
1923
1924                 psf->sf_addr = *psfsrc;
1925                 if (psf_prev) {
1926                         psf_prev->sf_next = psf;
1927                 } else
1928                         pmc->mca_sources = psf;
1929         }
1930         psf->sf_count[sfmode]++;
1931         return 0;
1932 }
1933
1934 static void sf_markstate(struct ifmcaddr6 *pmc)
1935 {
1936         struct ip6_sf_list *psf;
1937         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1938
1939         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1940                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1941                         psf->sf_oldin = mca_xcount ==
1942                                 psf->sf_count[MCAST_EXCLUDE] &&
1943                                 !psf->sf_count[MCAST_INCLUDE];
1944                 } else
1945                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1946 }
1947
1948 static int sf_setstate(struct ifmcaddr6 *pmc)
1949 {
1950         struct ip6_sf_list *psf, *dpsf;
1951         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1952         int qrv = pmc->idev->mc_qrv;
1953         int new_in, rv;
1954
1955         rv = 0;
1956         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1957                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1958                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1959                                 !psf->sf_count[MCAST_INCLUDE];
1960                 } else
1961                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1962                 if (new_in) {
1963                         if (!psf->sf_oldin) {
1964                                 struct ip6_sf_list *prev = NULL;
1965
1966                                 for (dpsf=pmc->mca_tomb; dpsf;
1967                                      dpsf=dpsf->sf_next) {
1968                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1969                                             &psf->sf_addr))
1970                                                 break;
1971                                         prev = dpsf;
1972                                 }
1973                                 if (dpsf) {
1974                                         if (prev)
1975                                                 prev->sf_next = dpsf->sf_next;
1976                                         else
1977                                                 pmc->mca_tomb = dpsf->sf_next;
1978                                         kfree(dpsf);
1979                                 }
1980                                 psf->sf_crcount = qrv;
1981                                 rv++;
1982                         }
1983                 } else if (psf->sf_oldin) {
1984                         psf->sf_crcount = 0;
1985                         /*
1986                          * add or update "delete" records if an active filter
1987                          * is now inactive
1988                          */
1989                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1990                                 if (ipv6_addr_equal(&dpsf->sf_addr,
1991                                     &psf->sf_addr))
1992                                         break;
1993                         if (!dpsf) {
1994                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1995                                 if (!dpsf)
1996                                         continue;
1997                                 *dpsf = *psf;
1998                                 /* pmc->mca_lock held by callers */
1999                                 dpsf->sf_next = pmc->mca_tomb;
2000                                 pmc->mca_tomb = dpsf;
2001                         }
2002                         dpsf->sf_crcount = qrv;
2003                         rv++;
2004                 }
2005         }
2006         return rv;
2007 }
2008
2009 /*
2010  * Add multicast source filter list to the interface list
2011  */
2012 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2013                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2014                           int delta)
2015 {
2016         struct ifmcaddr6 *pmc;
2017         int     isexclude;
2018         int     i, err;
2019
2020         if (!idev)
2021                 return -ENODEV;
2022         read_lock_bh(&idev->lock);
2023         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2024                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2025                         break;
2026         }
2027         if (!pmc) {
2028                 /* MCA not found?? bug */
2029                 read_unlock_bh(&idev->lock);
2030                 return -ESRCH;
2031         }
2032         spin_lock_bh(&pmc->mca_lock);
2033
2034         sf_markstate(pmc);
2035         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2036         if (!delta)
2037                 pmc->mca_sfcount[sfmode]++;
2038         err = 0;
2039         for (i=0; i<sfcount; i++) {
2040                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2041                 if (err)
2042                         break;
2043         }
2044         if (err) {
2045                 int j;
2046
2047                 if (!delta)
2048                         pmc->mca_sfcount[sfmode]--;
2049                 for (j=0; j<i; j++)
2050                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2051         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2052                 struct ip6_sf_list *psf;
2053
2054                 /* filter mode change */
2055                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2056                         pmc->mca_sfmode = MCAST_EXCLUDE;
2057                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2058                         pmc->mca_sfmode = MCAST_INCLUDE;
2059                 /* else no filters; keep old mode for reports */
2060
2061                 pmc->mca_crcount = idev->mc_qrv;
2062                 idev->mc_ifc_count = pmc->mca_crcount;
2063                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2064                         psf->sf_crcount = 0;
2065                 mld_ifc_event(idev);
2066         } else if (sf_setstate(pmc))
2067                 mld_ifc_event(idev);
2068         spin_unlock_bh(&pmc->mca_lock);
2069         read_unlock_bh(&idev->lock);
2070         return err;
2071 }
2072
2073 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2074 {
2075         struct ip6_sf_list *psf, *nextpsf;
2076
2077         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2078                 nextpsf = psf->sf_next;
2079                 kfree(psf);
2080         }
2081         pmc->mca_tomb = NULL;
2082         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2083                 nextpsf = psf->sf_next;
2084                 kfree(psf);
2085         }
2086         pmc->mca_sources = NULL;
2087         pmc->mca_sfmode = MCAST_EXCLUDE;
2088         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2089         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2090 }
2091
2092
2093 static void igmp6_join_group(struct ifmcaddr6 *ma)
2094 {
2095         unsigned long delay;
2096
2097         if (ma->mca_flags & MAF_NOREPORT)
2098                 return;
2099
2100         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2101
2102         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2103
2104         spin_lock_bh(&ma->mca_lock);
2105         if (del_timer(&ma->mca_timer)) {
2106                 atomic_dec(&ma->mca_refcnt);
2107                 delay = ma->mca_timer.expires - jiffies;
2108         }
2109
2110         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2111                 atomic_inc(&ma->mca_refcnt);
2112         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2113         spin_unlock_bh(&ma->mca_lock);
2114 }
2115
2116 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2117                             struct inet6_dev *idev)
2118 {
2119         int err;
2120
2121         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2122          * so no other readers or writers of iml or its sflist
2123          */
2124         if (!iml->sflist) {
2125                 /* any-source empty exclude case */
2126                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2127         }
2128         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2129                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2130         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2131         iml->sflist = NULL;
2132         return err;
2133 }
2134
2135 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2136 {
2137         if (MLD_V1_SEEN(ma->idev)) {
2138                 if (ma->mca_flags & MAF_LAST_REPORTER)
2139                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2140                                 ICMPV6_MGM_REDUCTION);
2141         } else {
2142                 mld_add_delrec(ma->idev, ma);
2143                 mld_ifc_event(ma->idev);
2144         }
2145 }
2146
2147 static void mld_gq_timer_expire(unsigned long data)
2148 {
2149         struct inet6_dev *idev = (struct inet6_dev *)data;
2150
2151         idev->mc_gq_running = 0;
2152         mld_send_report(idev, NULL);
2153         __in6_dev_put(idev);
2154 }
2155
2156 static void mld_ifc_timer_expire(unsigned long data)
2157 {
2158         struct inet6_dev *idev = (struct inet6_dev *)data;
2159
2160         mld_send_cr(idev);
2161         if (idev->mc_ifc_count) {
2162                 idev->mc_ifc_count--;
2163                 if (idev->mc_ifc_count)
2164                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2165         }
2166         __in6_dev_put(idev);
2167 }
2168
2169 static void mld_ifc_event(struct inet6_dev *idev)
2170 {
2171         if (MLD_V1_SEEN(idev))
2172                 return;
2173         idev->mc_ifc_count = idev->mc_qrv;
2174         mld_ifc_start_timer(idev, 1);
2175 }
2176
2177
2178 static void igmp6_timer_handler(unsigned long data)
2179 {
2180         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2181
2182         if (MLD_V1_SEEN(ma->idev))
2183                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2184         else
2185                 mld_send_report(ma->idev, ma);
2186
2187         spin_lock(&ma->mca_lock);
2188         ma->mca_flags |=  MAF_LAST_REPORTER;
2189         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2190         spin_unlock(&ma->mca_lock);
2191         ma_put(ma);
2192 }
2193
2194 /* Device changing type */
2195
2196 void ipv6_mc_unmap(struct inet6_dev *idev)
2197 {
2198         struct ifmcaddr6 *i;
2199
2200         /* Install multicast list, except for all-nodes (already installed) */
2201
2202         read_lock_bh(&idev->lock);
2203         for (i = idev->mc_list; i; i = i->next)
2204                 igmp6_group_dropped(i);
2205         read_unlock_bh(&idev->lock);
2206 }
2207
2208 void ipv6_mc_remap(struct inet6_dev *idev)
2209 {
2210         ipv6_mc_up(idev);
2211 }
2212
2213 /* Device going down */
2214
2215 void ipv6_mc_down(struct inet6_dev *idev)
2216 {
2217         struct ifmcaddr6 *i;
2218
2219         /* Withdraw multicast list */
2220
2221         read_lock_bh(&idev->lock);
2222         idev->mc_ifc_count = 0;
2223         if (del_timer(&idev->mc_ifc_timer))
2224                 __in6_dev_put(idev);
2225         idev->mc_gq_running = 0;
2226         if (del_timer(&idev->mc_gq_timer))
2227                 __in6_dev_put(idev);
2228
2229         for (i = idev->mc_list; i; i=i->next)
2230                 igmp6_group_dropped(i);
2231         read_unlock_bh(&idev->lock);
2232
2233         mld_clear_delrec(idev);
2234 }
2235
2236
2237 /* Device going up */
2238
2239 void ipv6_mc_up(struct inet6_dev *idev)
2240 {
2241         struct ifmcaddr6 *i;
2242
2243         /* Install multicast list, except for all-nodes (already installed) */
2244
2245         read_lock_bh(&idev->lock);
2246         for (i = idev->mc_list; i; i=i->next)
2247                 igmp6_group_added(i);
2248         read_unlock_bh(&idev->lock);
2249 }
2250
2251 /* IPv6 device initialization. */
2252
2253 void ipv6_mc_init_dev(struct inet6_dev *idev)
2254 {
2255         write_lock_bh(&idev->lock);
2256         spin_lock_init(&idev->mc_lock);
2257         idev->mc_gq_running = 0;
2258         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2259                         (unsigned long)idev);
2260         idev->mc_tomb = NULL;
2261         idev->mc_ifc_count = 0;
2262         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2263                         (unsigned long)idev);
2264         idev->mc_qrv = MLD_QRV_DEFAULT;
2265         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2266         idev->mc_v1_seen = 0;
2267         write_unlock_bh(&idev->lock);
2268 }
2269
2270 /*
2271  *      Device is about to be destroyed: clean up.
2272  */
2273
2274 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2275 {
2276         struct ifmcaddr6 *i;
2277
2278         /* Deactivate timers */
2279         ipv6_mc_down(idev);
2280
2281         /* Delete all-nodes address. */
2282         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2283          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2284          * fail.
2285          */
2286         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2287
2288         if (idev->cnf.forwarding)
2289                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2290
2291         write_lock_bh(&idev->lock);
2292         while ((i = idev->mc_list) != NULL) {
2293                 idev->mc_list = i->next;
2294                 write_unlock_bh(&idev->lock);
2295
2296                 igmp6_group_dropped(i);
2297                 ma_put(i);
2298
2299                 write_lock_bh(&idev->lock);
2300         }
2301         write_unlock_bh(&idev->lock);
2302 }
2303
2304 #ifdef CONFIG_PROC_FS
2305 struct igmp6_mc_iter_state {
2306         struct seq_net_private p;
2307         struct net_device *dev;
2308         struct inet6_dev *idev;
2309 };
2310
2311 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2312
2313 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2314 {
2315         struct ifmcaddr6 *im = NULL;
2316         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2317         struct net *net = seq_file_net(seq);
2318
2319         state->idev = NULL;
2320         for_each_netdev_rcu(net, state->dev) {
2321                 struct inet6_dev *idev;
2322                 idev = __in6_dev_get(state->dev);
2323                 if (!idev)
2324                         continue;
2325                 read_lock_bh(&idev->lock);
2326                 im = idev->mc_list;
2327                 if (im) {
2328                         state->idev = idev;
2329                         break;
2330                 }
2331                 read_unlock_bh(&idev->lock);
2332         }
2333         return im;
2334 }
2335
2336 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2337 {
2338         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2339
2340         im = im->next;
2341         while (!im) {
2342                 if (likely(state->idev != NULL))
2343                         read_unlock_bh(&state->idev->lock);
2344
2345                 state->dev = next_net_device_rcu(state->dev);
2346                 if (!state->dev) {
2347                         state->idev = NULL;
2348                         break;
2349                 }
2350                 state->idev = __in6_dev_get(state->dev);
2351                 if (!state->idev)
2352                         continue;
2353                 read_lock_bh(&state->idev->lock);
2354                 im = state->idev->mc_list;
2355         }
2356         return im;
2357 }
2358
2359 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2360 {
2361         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2362         if (im)
2363                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2364                         --pos;
2365         return pos ? NULL : im;
2366 }
2367
2368 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2369         __acquires(RCU)
2370 {
2371         rcu_read_lock();
2372         return igmp6_mc_get_idx(seq, *pos);
2373 }
2374
2375 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2376 {
2377         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2378
2379         ++*pos;
2380         return im;
2381 }
2382
2383 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2384         __releases(RCU)
2385 {
2386         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2387
2388         if (likely(state->idev != NULL)) {
2389                 read_unlock_bh(&state->idev->lock);
2390                 state->idev = NULL;
2391         }
2392         state->dev = NULL;
2393         rcu_read_unlock();
2394 }
2395
2396 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2397 {
2398         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2399         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2400
2401         seq_printf(seq,
2402                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2403                    state->dev->ifindex, state->dev->name,
2404                    &im->mca_addr,
2405                    im->mca_users, im->mca_flags,
2406                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2407                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2408         return 0;
2409 }
2410
2411 static const struct seq_operations igmp6_mc_seq_ops = {
2412         .start  =       igmp6_mc_seq_start,
2413         .next   =       igmp6_mc_seq_next,
2414         .stop   =       igmp6_mc_seq_stop,
2415         .show   =       igmp6_mc_seq_show,
2416 };
2417
2418 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2419 {
2420         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2421                             sizeof(struct igmp6_mc_iter_state));
2422 }
2423
2424 static const struct file_operations igmp6_mc_seq_fops = {
2425         .owner          =       THIS_MODULE,
2426         .open           =       igmp6_mc_seq_open,
2427         .read           =       seq_read,
2428         .llseek         =       seq_lseek,
2429         .release        =       seq_release_net,
2430 };
2431
2432 struct igmp6_mcf_iter_state {
2433         struct seq_net_private p;
2434         struct net_device *dev;
2435         struct inet6_dev *idev;
2436         struct ifmcaddr6 *im;
2437 };
2438
2439 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2440
2441 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2442 {
2443         struct ip6_sf_list *psf = NULL;
2444         struct ifmcaddr6 *im = NULL;
2445         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2446         struct net *net = seq_file_net(seq);
2447
2448         state->idev = NULL;
2449         state->im = NULL;
2450         for_each_netdev_rcu(net, state->dev) {
2451                 struct inet6_dev *idev;
2452                 idev = __in6_dev_get(state->dev);
2453                 if (unlikely(idev == NULL))
2454                         continue;
2455                 read_lock_bh(&idev->lock);
2456                 im = idev->mc_list;
2457                 if (likely(im != NULL)) {
2458                         spin_lock_bh(&im->mca_lock);
2459                         psf = im->mca_sources;
2460                         if (likely(psf != NULL)) {
2461                                 state->im = im;
2462                                 state->idev = idev;
2463                                 break;
2464                         }
2465                         spin_unlock_bh(&im->mca_lock);
2466                 }
2467                 read_unlock_bh(&idev->lock);
2468         }
2469         return psf;
2470 }
2471
2472 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2473 {
2474         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2475
2476         psf = psf->sf_next;
2477         while (!psf) {
2478                 spin_unlock_bh(&state->im->mca_lock);
2479                 state->im = state->im->next;
2480                 while (!state->im) {
2481                         if (likely(state->idev != NULL))
2482                                 read_unlock_bh(&state->idev->lock);
2483
2484                         state->dev = next_net_device_rcu(state->dev);
2485                         if (!state->dev) {
2486                                 state->idev = NULL;
2487                                 goto out;
2488                         }
2489                         state->idev = __in6_dev_get(state->dev);
2490                         if (!state->idev)
2491                                 continue;
2492                         read_lock_bh(&state->idev->lock);
2493                         state->im = state->idev->mc_list;
2494                 }
2495                 if (!state->im)
2496                         break;
2497                 spin_lock_bh(&state->im->mca_lock);
2498                 psf = state->im->mca_sources;
2499         }
2500 out:
2501         return psf;
2502 }
2503
2504 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2505 {
2506         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2507         if (psf)
2508                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2509                         --pos;
2510         return pos ? NULL : psf;
2511 }
2512
2513 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2514         __acquires(RCU)
2515 {
2516         rcu_read_lock();
2517         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2518 }
2519
2520 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2521 {
2522         struct ip6_sf_list *psf;
2523         if (v == SEQ_START_TOKEN)
2524                 psf = igmp6_mcf_get_first(seq);
2525         else
2526                 psf = igmp6_mcf_get_next(seq, v);
2527         ++*pos;
2528         return psf;
2529 }
2530
2531 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2532         __releases(RCU)
2533 {
2534         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2535         if (likely(state->im != NULL)) {
2536                 spin_unlock_bh(&state->im->mca_lock);
2537                 state->im = NULL;
2538         }
2539         if (likely(state->idev != NULL)) {
2540                 read_unlock_bh(&state->idev->lock);
2541                 state->idev = NULL;
2542         }
2543         state->dev = NULL;
2544         rcu_read_unlock();
2545 }
2546
2547 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2548 {
2549         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2550         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2551
2552         if (v == SEQ_START_TOKEN) {
2553                 seq_printf(seq,
2554                            "%3s %6s "
2555                            "%32s %32s %6s %6s\n", "Idx",
2556                            "Device", "Multicast Address",
2557                            "Source Address", "INC", "EXC");
2558         } else {
2559                 seq_printf(seq,
2560                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2561                            state->dev->ifindex, state->dev->name,
2562                            &state->im->mca_addr,
2563                            &psf->sf_addr,
2564                            psf->sf_count[MCAST_INCLUDE],
2565                            psf->sf_count[MCAST_EXCLUDE]);
2566         }
2567         return 0;
2568 }
2569
2570 static const struct seq_operations igmp6_mcf_seq_ops = {
2571         .start  =       igmp6_mcf_seq_start,
2572         .next   =       igmp6_mcf_seq_next,
2573         .stop   =       igmp6_mcf_seq_stop,
2574         .show   =       igmp6_mcf_seq_show,
2575 };
2576
2577 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2578 {
2579         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2580                             sizeof(struct igmp6_mcf_iter_state));
2581 }
2582
2583 static const struct file_operations igmp6_mcf_seq_fops = {
2584         .owner          =       THIS_MODULE,
2585         .open           =       igmp6_mcf_seq_open,
2586         .read           =       seq_read,
2587         .llseek         =       seq_lseek,
2588         .release        =       seq_release_net,
2589 };
2590
2591 static int __net_init igmp6_proc_init(struct net *net)
2592 {
2593         int err;
2594
2595         err = -ENOMEM;
2596         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2597                 goto out;
2598         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2599                                   &igmp6_mcf_seq_fops))
2600                 goto out_proc_net_igmp6;
2601
2602         err = 0;
2603 out:
2604         return err;
2605
2606 out_proc_net_igmp6:
2607         proc_net_remove(net, "igmp6");
2608         goto out;
2609 }
2610
2611 static void __net_exit igmp6_proc_exit(struct net *net)
2612 {
2613         proc_net_remove(net, "mcfilter6");
2614         proc_net_remove(net, "igmp6");
2615 }
2616 #else
2617 static inline int igmp6_proc_init(struct net *net)
2618 {
2619         return 0;
2620 }
2621 static inline void igmp6_proc_exit(struct net *net)
2622 {
2623 }
2624 #endif
2625
2626 static int __net_init igmp6_net_init(struct net *net)
2627 {
2628         int err;
2629
2630         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2631                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2632         if (err < 0) {
2633                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2634                        err);
2635                 goto out;
2636         }
2637
2638         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2639
2640         err = igmp6_proc_init(net);
2641         if (err)
2642                 goto out_sock_create;
2643 out:
2644         return err;
2645
2646 out_sock_create:
2647         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2648         goto out;
2649 }
2650
2651 static void __net_exit igmp6_net_exit(struct net *net)
2652 {
2653         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2654         igmp6_proc_exit(net);
2655 }
2656
2657 static struct pernet_operations igmp6_net_ops = {
2658         .init = igmp6_net_init,
2659         .exit = igmp6_net_exit,
2660 };
2661
2662 int __init igmp6_init(void)
2663 {
2664         return register_pernet_subsys(&igmp6_net_ops);
2665 }
2666
2667 void igmp6_cleanup(void)
2668 {
2669         unregister_pernet_subsys(&igmp6_net_ops);
2670 }