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, 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, struct in6_addr *pmca,
 101                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 102                           int delta);
 103 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 104                           int sfmode, int sfcount, 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         ipv6_addr_copy(&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->rt6i_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 static void ipv6_mc_socklist_reclaim(struct rcu_head *head)
 205 {
 206         kfree(container_of(head, struct ipv6_mc_socklist, rcu));
 207 }
 208 /*
 209  *      socket leave on multicast group
 210  */
 211 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 212 {
 213         struct ipv6_pinfo *np = inet6_sk(sk);
 214         struct ipv6_mc_socklist *mc_lst;
 215         struct ipv6_mc_socklist __rcu **lnk;
 216         struct net *net = sock_net(sk);
 217
 218         spin_lock(&ipv6_sk_mc_lock);
 219         for (lnk = &np->ipv6_mc_list;
 220              (mc_lst = rcu_dereference_protected(*lnk,
 221                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 222               lnk = &mc_lst->next) {
 223                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 224                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 225                         struct net_device *dev;
 226
 227                         *lnk = mc_lst->next;
 228                         spin_unlock(&ipv6_sk_mc_lock);
 229
 230                         rcu_read_lock();
 231                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 232                         if (dev != NULL) {
 233                                 struct inet6_dev *idev = __in6_dev_get(dev);
 234
 235                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 236                                 if (idev)
 237                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 238                         } else
 239                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 240                         rcu_read_unlock();
 241                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 242                         call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim);
 243                         return 0;
 244                 }
 245         }
 246         spin_unlock(&ipv6_sk_mc_lock);
 247
 248         return -EADDRNOTAVAIL;
 249 }
 250
 251 /* called with rcu_read_lock() */
 252 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 253                                              struct in6_addr *group,
 254                                              int ifindex)
 255 {
 256         struct net_device *dev = NULL;
 257         struct inet6_dev *idev = NULL;
 258
 259         if (ifindex == 0) {
 260                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 261
 262                 if (rt) {
 263                         dev = rt->rt6i_dev;
 264                         dev_hold(dev);
 265                         dst_release(&rt->dst);
 266                 }
 267         } else
 268                 dev = dev_get_by_index_rcu(net, ifindex);
 269
 270         if (!dev)
 271                 return NULL;
 272         idev = __in6_dev_get(dev);
 273         if (!idev)
 274                 return NULL;
 275         read_lock_bh(&idev->lock);
 276         if (idev->dead) {
 277                 read_unlock_bh(&idev->lock);
 278                 return NULL;
 279         }
 280         return idev;
 281 }
 282
 283 void ipv6_sock_mc_close(struct sock *sk)
 284 {
 285         struct ipv6_pinfo *np = inet6_sk(sk);
 286         struct ipv6_mc_socklist *mc_lst;
 287         struct net *net = sock_net(sk);
 288
 289         spin_lock(&ipv6_sk_mc_lock);
 290         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 291                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 292                 struct net_device *dev;
 293
 294                 np->ipv6_mc_list = mc_lst->next;
 295                 spin_unlock(&ipv6_sk_mc_lock);
 296
 297                 rcu_read_lock();
 298                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 299                 if (dev) {
 300                         struct inet6_dev *idev = __in6_dev_get(dev);
 301
 302                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 303                         if (idev)
 304                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 305                 } else
 306                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 307                 rcu_read_unlock();
 308
 309                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 310                 call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim);
 311
 312                 spin_lock(&ipv6_sk_mc_lock);
 313         }
 314         spin_unlock(&ipv6_sk_mc_lock);
 315 }
 316
 317 int ip6_mc_source(int add, int omode, struct sock *sk,
 318         struct group_source_req *pgsr)
 319 {
 320         struct in6_addr *source, *group;
 321         struct ipv6_mc_socklist *pmc;
 322         struct inet6_dev *idev;
 323         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 324         struct ip6_sf_socklist *psl;
 325         struct net *net = sock_net(sk);
 326         int i, j, rv;
 327         int leavegroup = 0;
 328         int pmclocked = 0;
 329         int err;
 330
 331         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 332         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 333
 334         if (!ipv6_addr_is_multicast(group))
 335                 return -EINVAL;
 336
 337         rcu_read_lock();
 338         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 339         if (!idev) {
 340                 rcu_read_unlock();
 341                 return -ENODEV;
 342         }
 343
 344         err = -EADDRNOTAVAIL;
 345
 346         for_each_pmc_rcu(inet6, pmc) {
 347                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 348                         continue;
 349                 if (ipv6_addr_equal(&pmc->addr, group))
 350                         break;
 351         }
 352         if (!pmc) {             /* must have a prior join */
 353                 err = -EINVAL;
 354                 goto done;
 355         }
 356         /* if a source filter was set, must be the same mode as before */
 357         if (pmc->sflist) {
 358                 if (pmc->sfmode != omode) {
 359                         err = -EINVAL;
 360                         goto done;
 361                 }
 362         } else if (pmc->sfmode != omode) {
 363                 /* allow mode switches for empty-set filters */
 364                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 365                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 366                 pmc->sfmode = omode;
 367         }
 368
 369         write_lock(&pmc->sflock);
 370         pmclocked = 1;
 371
 372         psl = pmc->sflist;
 373         if (!add) {
 374                 if (!psl)
 375                         goto done;      /* err = -EADDRNOTAVAIL */
 376                 rv = !0;
 377                 for (i=0; i<psl->sl_count; i++) {
 378                         rv = memcmp(&psl->sl_addr[i], source,
 379                                 sizeof(struct in6_addr));
 380                         if (rv == 0)
 381                                 break;
 382                 }
 383                 if (rv)         /* source not found */
 384                         goto done;      /* err = -EADDRNOTAVAIL */
 385
 386                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 387                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 388                         leavegroup = 1;
 389                         goto done;
 390                 }
 391
 392                 /* update the interface filter */
 393                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 394
 395                 for (j=i+1; j<psl->sl_count; j++)
 396                         psl->sl_addr[j-1] = psl->sl_addr[j];
 397                 psl->sl_count--;
 398                 err = 0;
 399                 goto done;
 400         }
 401         /* else, add a new source to the filter */
 402
 403         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 404                 err = -ENOBUFS;
 405                 goto done;
 406         }
 407         if (!psl || psl->sl_count == psl->sl_max) {
 408                 struct ip6_sf_socklist *newpsl;
 409                 int count = IP6_SFBLOCK;
 410
 411                 if (psl)
 412                         count += psl->sl_max;
 413                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 414                 if (!newpsl) {
 415                         err = -ENOBUFS;
 416                         goto done;
 417                 }
 418                 newpsl->sl_max = count;
 419                 newpsl->sl_count = count - IP6_SFBLOCK;
 420                 if (psl) {
 421                         for (i=0; i<psl->sl_count; i++)
 422                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 423                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 424                 }
 425                 pmc->sflist = psl = newpsl;
 426         }
 427         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 428         for (i=0; i<psl->sl_count; i++) {
 429                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 430                 if (rv == 0)
 431                         break;
 432         }
 433         if (rv == 0)            /* address already there is an error */
 434                 goto done;
 435         for (j=psl->sl_count-1; j>=i; j--)
 436                 psl->sl_addr[j+1] = psl->sl_addr[j];
 437         psl->sl_addr[i] = *source;
 438         psl->sl_count++;
 439         err = 0;
 440         /* update the interface list */
 441         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 442 done:
 443         if (pmclocked)
 444                 write_unlock(&pmc->sflock);
 445         read_unlock_bh(&idev->lock);
 446         rcu_read_unlock();
 447         if (leavegroup)
 448                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 449         return err;
 450 }
 451
 452 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 453 {
 454         struct in6_addr *group;
 455         struct ipv6_mc_socklist *pmc;
 456         struct inet6_dev *idev;
 457         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 458         struct ip6_sf_socklist *newpsl, *psl;
 459         struct net *net = sock_net(sk);
 460         int leavegroup = 0;
 461         int i, err;
 462
 463         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 464
 465         if (!ipv6_addr_is_multicast(group))
 466                 return -EINVAL;
 467         if (gsf->gf_fmode != MCAST_INCLUDE &&
 468             gsf->gf_fmode != MCAST_EXCLUDE)
 469                 return -EINVAL;
 470
 471         rcu_read_lock();
 472         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 473
 474         if (!idev) {
 475                 rcu_read_unlock();
 476                 return -ENODEV;
 477         }
 478
 479         err = 0;
 480
 481         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 482                 leavegroup = 1;
 483                 goto done;
 484         }
 485
 486         for_each_pmc_rcu(inet6, pmc) {
 487                 if (pmc->ifindex != gsf->gf_interface)
 488                         continue;
 489                 if (ipv6_addr_equal(&pmc->addr, group))
 490                         break;
 491         }
 492         if (!pmc) {             /* must have a prior join */
 493                 err = -EINVAL;
 494                 goto done;
 495         }
 496         if (gsf->gf_numsrc) {
 497                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 498                                                           GFP_ATOMIC);
 499                 if (!newpsl) {
 500                         err = -ENOBUFS;
 501                         goto done;
 502                 }
 503                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 504                 for (i=0; i<newpsl->sl_count; ++i) {
 505                         struct sockaddr_in6 *psin6;
 506
 507                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 508                         newpsl->sl_addr[i] = psin6->sin6_addr;
 509                 }
 510                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 511                         newpsl->sl_count, newpsl->sl_addr, 0);
 512                 if (err) {
 513                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 514                         goto done;
 515                 }
 516         } else {
 517                 newpsl = NULL;
 518                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 519         }
 520
 521         write_lock(&pmc->sflock);
 522         psl = pmc->sflist;
 523         if (psl) {
 524                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 525                         psl->sl_count, psl->sl_addr, 0);
 526                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 527         } else
 528                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 529         pmc->sflist = newpsl;
 530         pmc->sfmode = gsf->gf_fmode;
 531         write_unlock(&pmc->sflock);
 532         err = 0;
 533 done:
 534         read_unlock_bh(&idev->lock);
 535         rcu_read_unlock();
 536         if (leavegroup)
 537                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 538         return err;
 539 }
 540
 541 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 542         struct group_filter __user *optval, int __user *optlen)
 543 {
 544         int err, i, count, copycount;
 545         struct in6_addr *group;
 546         struct ipv6_mc_socklist *pmc;
 547         struct inet6_dev *idev;
 548         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 549         struct ip6_sf_socklist *psl;
 550         struct net *net = sock_net(sk);
 551
 552         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 553
 554         if (!ipv6_addr_is_multicast(group))
 555                 return -EINVAL;
 556
 557         rcu_read_lock();
 558         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 559
 560         if (!idev) {
 561                 rcu_read_unlock();
 562                 return -ENODEV;
 563         }
 564
 565         err = -EADDRNOTAVAIL;
 566         /*
 567          * changes to the ipv6_mc_list require the socket lock and
 568          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 569          * so reading the list is safe.
 570          */
 571
 572         for_each_pmc_rcu(inet6, pmc) {
 573                 if (pmc->ifindex != gsf->gf_interface)
 574                         continue;
 575                 if (ipv6_addr_equal(group, &pmc->addr))
 576                         break;
 577         }
 578         if (!pmc)               /* must have a prior join */
 579                 goto done;
 580         gsf->gf_fmode = pmc->sfmode;
 581         psl = pmc->sflist;
 582         count = psl ? psl->sl_count : 0;
 583         read_unlock_bh(&idev->lock);
 584         rcu_read_unlock();
 585
 586         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 587         gsf->gf_numsrc = count;
 588         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 589             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 590                 return -EFAULT;
 591         }
 592         /* changes to psl require the socket lock, a read lock on
 593          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 594          * have the socket lock, so reading here is safe.
 595          */
 596         for (i=0; i<copycount; i++) {
 597                 struct sockaddr_in6 *psin6;
 598                 struct sockaddr_storage ss;
 599
 600                 psin6 = (struct sockaddr_in6 *)&ss;
 601                 memset(&ss, 0, sizeof(ss));
 602                 psin6->sin6_family = AF_INET6;
 603                 psin6->sin6_addr = psl->sl_addr[i];
 604                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 605                         return -EFAULT;
 606         }
 607         return 0;
 608 done:
 609         read_unlock_bh(&idev->lock);
 610         rcu_read_unlock();
 611         return err;
 612 }
 613
 614 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 615                    const struct in6_addr *src_addr)
 616 {
 617         struct ipv6_pinfo *np = inet6_sk(sk);
 618         struct ipv6_mc_socklist *mc;
 619         struct ip6_sf_socklist *psl;
 620         int rv = 1;
 621
 622         rcu_read_lock();
 623         for_each_pmc_rcu(np, mc) {
 624                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 625                         break;
 626         }
 627         if (!mc) {
 628                 rcu_read_unlock();
 629                 return 1;
 630         }
 631         read_lock(&mc->sflock);
 632         psl = mc->sflist;
 633         if (!psl) {
 634                 rv = mc->sfmode == MCAST_EXCLUDE;
 635         } else {
 636                 int i;
 637
 638                 for (i=0; i<psl->sl_count; i++) {
 639                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 640                                 break;
 641                 }
 642                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 643                         rv = 0;
 644                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 645                         rv = 0;
 646         }
 647         read_unlock(&mc->sflock);
 648         rcu_read_unlock();
 649
 650         return rv;
 651 }
 652
 653 static void ma_put(struct ifmcaddr6 *mc)
 654 {
 655         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 656                 in6_dev_put(mc->idev);
 657                 kfree(mc);
 658         }
 659 }
 660
 661 static void igmp6_group_added(struct ifmcaddr6 *mc)
 662 {
 663         struct net_device *dev = mc->idev->dev;
 664         char buf[MAX_ADDR_LEN];
 665
 666         spin_lock_bh(&mc->mca_lock);
 667         if (!(mc->mca_flags&MAF_LOADED)) {
 668                 mc->mca_flags |= MAF_LOADED;
 669                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 670                         dev_mc_add(dev, buf);
 671         }
 672         spin_unlock_bh(&mc->mca_lock);
 673
 674         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 675                 return;
 676
 677         if (MLD_V1_SEEN(mc->idev)) {
 678                 igmp6_join_group(mc);
 679                 return;
 680         }
 681         /* else v2 */
 682
 683         mc->mca_crcount = mc->idev->mc_qrv;
 684         mld_ifc_event(mc->idev);
 685 }
 686
 687 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 688 {
 689         struct net_device *dev = mc->idev->dev;
 690         char buf[MAX_ADDR_LEN];
 691
 692         spin_lock_bh(&mc->mca_lock);
 693         if (mc->mca_flags&MAF_LOADED) {
 694                 mc->mca_flags &= ~MAF_LOADED;
 695                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 696                         dev_mc_del(dev, buf);
 697         }
 698
 699         if (mc->mca_flags & MAF_NOREPORT)
 700                 goto done;
 701         spin_unlock_bh(&mc->mca_lock);
 702
 703         if (!mc->idev->dead)
 704                 igmp6_leave_group(mc);
 705
 706         spin_lock_bh(&mc->mca_lock);
 707         if (del_timer(&mc->mca_timer))
 708                 atomic_dec(&mc->mca_refcnt);
 709 done:
 710         ip6_mc_clear_src(mc);
 711         spin_unlock_bh(&mc->mca_lock);
 712 }
 713
 714 /*
 715  * deleted ifmcaddr6 manipulation
 716  */
 717 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 718 {
 719         struct ifmcaddr6 *pmc;
 720
 721         /* this is an "ifmcaddr6" for convenience; only the fields below
 722          * are actually used. In particular, the refcnt and users are not
 723          * used for management of the delete list. Using the same structure
 724          * for deleted items allows change reports to use common code with
 725          * non-deleted or query-response MCA's.
 726          */
 727         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 728         if (!pmc)
 729                 return;
 730
 731         spin_lock_bh(&im->mca_lock);
 732         spin_lock_init(&pmc->mca_lock);
 733         pmc->idev = im->idev;
 734         in6_dev_hold(idev);
 735         pmc->mca_addr = im->mca_addr;
 736         pmc->mca_crcount = idev->mc_qrv;
 737         pmc->mca_sfmode = im->mca_sfmode;
 738         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 739                 struct ip6_sf_list *psf;
 740
 741                 pmc->mca_tomb = im->mca_tomb;
 742                 pmc->mca_sources = im->mca_sources;
 743                 im->mca_tomb = im->mca_sources = NULL;
 744                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 745                         psf->sf_crcount = pmc->mca_crcount;
 746         }
 747         spin_unlock_bh(&im->mca_lock);
 748
 749         spin_lock_bh(&idev->mc_lock);
 750         pmc->next = idev->mc_tomb;
 751         idev->mc_tomb = pmc;
 752         spin_unlock_bh(&idev->mc_lock);
 753 }
 754
 755 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 756 {
 757         struct ifmcaddr6 *pmc, *pmc_prev;
 758         struct ip6_sf_list *psf, *psf_next;
 759
 760         spin_lock_bh(&idev->mc_lock);
 761         pmc_prev = NULL;
 762         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 763                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 764                         break;
 765                 pmc_prev = pmc;
 766         }
 767         if (pmc) {
 768                 if (pmc_prev)
 769                         pmc_prev->next = pmc->next;
 770                 else
 771                         idev->mc_tomb = pmc->next;
 772         }
 773         spin_unlock_bh(&idev->mc_lock);
 774
 775         if (pmc) {
 776                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 777                         psf_next = psf->sf_next;
 778                         kfree(psf);
 779                 }
 780                 in6_dev_put(pmc->idev);
 781                 kfree(pmc);
 782         }
 783 }
 784
 785 static void mld_clear_delrec(struct inet6_dev *idev)
 786 {
 787         struct ifmcaddr6 *pmc, *nextpmc;
 788
 789         spin_lock_bh(&idev->mc_lock);
 790         pmc = idev->mc_tomb;
 791         idev->mc_tomb = NULL;
 792         spin_unlock_bh(&idev->mc_lock);
 793
 794         for (; pmc; pmc = nextpmc) {
 795                 nextpmc = pmc->next;
 796                 ip6_mc_clear_src(pmc);
 797                 in6_dev_put(pmc->idev);
 798                 kfree(pmc);
 799         }
 800
 801         /* clear dead sources, too */
 802         read_lock_bh(&idev->lock);
 803         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 804                 struct ip6_sf_list *psf, *psf_next;
 805
 806                 spin_lock_bh(&pmc->mca_lock);
 807                 psf = pmc->mca_tomb;
 808                 pmc->mca_tomb = NULL;
 809                 spin_unlock_bh(&pmc->mca_lock);
 810                 for (; psf; psf=psf_next) {
 811                         psf_next = psf->sf_next;
 812                         kfree(psf);
 813                 }
 814         }
 815         read_unlock_bh(&idev->lock);
 816 }
 817
 818
 819 /*
 820  *      device multicast group inc (add if not found)
 821  */
 822 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 823 {
 824         struct ifmcaddr6 *mc;
 825         struct inet6_dev *idev;
 826
 827         /* we need to take a reference on idev */
 828         idev = in6_dev_get(dev);
 829
 830         if (idev == NULL)
 831                 return -EINVAL;
 832
 833         write_lock_bh(&idev->lock);
 834         if (idev->dead) {
 835                 write_unlock_bh(&idev->lock);
 836                 in6_dev_put(idev);
 837                 return -ENODEV;
 838         }
 839
 840         for (mc = idev->mc_list; mc; mc = mc->next) {
 841                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 842                         mc->mca_users++;
 843                         write_unlock_bh(&idev->lock);
 844                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 845                                 NULL, 0);
 846                         in6_dev_put(idev);
 847                         return 0;
 848                 }
 849         }
 850
 851         /*
 852          *      not found: create a new one.
 853          */
 854
 855         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 856
 857         if (mc == NULL) {
 858                 write_unlock_bh(&idev->lock);
 859                 in6_dev_put(idev);
 860                 return -ENOMEM;
 861         }
 862
 863         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 864
 865         ipv6_addr_copy(&mc->mca_addr, addr);
 866         mc->idev = idev; /* (reference taken) */
 867         mc->mca_users = 1;
 868         /* mca_stamp should be updated upon changes */
 869         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 870         atomic_set(&mc->mca_refcnt, 2);
 871         spin_lock_init(&mc->mca_lock);
 872
 873         /* initial mode is (EX, empty) */
 874         mc->mca_sfmode = MCAST_EXCLUDE;
 875         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 876
 877         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 878             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 879                 mc->mca_flags |= MAF_NOREPORT;
 880
 881         mc->next = idev->mc_list;
 882         idev->mc_list = mc;
 883         write_unlock_bh(&idev->lock);
 884
 885         mld_del_delrec(idev, &mc->mca_addr);
 886         igmp6_group_added(mc);
 887         ma_put(mc);
 888         return 0;
 889 }
 890
 891 /*
 892  *      device multicast group del
 893  */
 894 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 895 {
 896         struct ifmcaddr6 *ma, **map;
 897
 898         write_lock_bh(&idev->lock);
 899         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 900                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 901                         if (--ma->mca_users == 0) {
 902                                 *map = ma->next;
 903                                 write_unlock_bh(&idev->lock);
 904
 905                                 igmp6_group_dropped(ma);
 906
 907                                 ma_put(ma);
 908                                 return 0;
 909                         }
 910                         write_unlock_bh(&idev->lock);
 911                         return 0;
 912                 }
 913         }
 914         write_unlock_bh(&idev->lock);
 915
 916         return -ENOENT;
 917 }
 918
 919 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 920 {
 921         struct inet6_dev *idev;
 922         int err;
 923
 924         rcu_read_lock();
 925
 926         idev = __in6_dev_get(dev);
 927         if (!idev)
 928                 err = -ENODEV;
 929         else
 930                 err = __ipv6_dev_mc_dec(idev, addr);
 931
 932         rcu_read_unlock();
 933         return err;
 934 }
 935
 936 /*
 937  * identify MLD packets for MLD filter exceptions
 938  */
 939 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 940 {
 941         struct icmp6hdr *pic;
 942
 943         if (nexthdr != IPPROTO_ICMPV6)
 944                 return 0;
 945
 946         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 947                 return 0;
 948
 949         pic = icmp6_hdr(skb);
 950
 951         switch (pic->icmp6_type) {
 952         case ICMPV6_MGM_QUERY:
 953         case ICMPV6_MGM_REPORT:
 954         case ICMPV6_MGM_REDUCTION:
 955         case ICMPV6_MLD2_REPORT:
 956                 return 1;
 957         default:
 958                 break;
 959         }
 960         return 0;
 961 }
 962
 963 /*
 964  *      check if the interface/address pair is valid
 965  */
 966 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 967                         const struct in6_addr *src_addr)
 968 {
 969         struct inet6_dev *idev;
 970         struct ifmcaddr6 *mc;
 971         int rv = 0;
 972
 973         rcu_read_lock();
 974         idev = __in6_dev_get(dev);
 975         if (idev) {
 976                 read_lock_bh(&idev->lock);
 977                 for (mc = idev->mc_list; mc; mc=mc->next) {
 978                         if (ipv6_addr_equal(&mc->mca_addr, group))
 979                                 break;
 980                 }
 981                 if (mc) {
 982                         if (src_addr && !ipv6_addr_any(src_addr)) {
 983                                 struct ip6_sf_list *psf;
 984
 985                                 spin_lock_bh(&mc->mca_lock);
 986                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 987                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 988                                                 break;
 989                                 }
 990                                 if (psf)
 991                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 992                                                 psf->sf_count[MCAST_EXCLUDE] !=
 993                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 994                                 else
 995                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 996                                 spin_unlock_bh(&mc->mca_lock);
 997                         } else
 998                                 rv = 1; /* don't filter unspecified source */
 999                 }
1000                 read_unlock_bh(&idev->lock);
1001         }
1002         rcu_read_unlock();
1003         return rv;
1004 }
1005
1006 static void mld_gq_start_timer(struct inet6_dev *idev)
1007 {
1008         int tv = net_random() % idev->mc_maxdelay;
1009
1010         idev->mc_gq_running = 1;
1011         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1012                 in6_dev_hold(idev);
1013 }
1014
1015 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1016 {
1017         int tv = net_random() % delay;
1018
1019         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1020                 in6_dev_hold(idev);
1021 }
1022
1023 /*
1024  *      IGMP handling (alias multicast ICMPv6 messages)
1025  */
1026
1027 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1028 {
1029         unsigned long delay = resptime;
1030
1031         /* Do not start timer for these addresses */
1032         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1033             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1034                 return;
1035
1036         if (del_timer(&ma->mca_timer)) {
1037                 atomic_dec(&ma->mca_refcnt);
1038                 delay = ma->mca_timer.expires - jiffies;
1039         }
1040
1041         if (delay >= resptime) {
1042                 if (resptime)
1043                         delay = net_random() % resptime;
1044                 else
1045                         delay = 1;
1046         }
1047         ma->mca_timer.expires = jiffies + delay;
1048         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1049                 atomic_inc(&ma->mca_refcnt);
1050         ma->mca_flags |= MAF_TIMER_RUNNING;
1051 }
1052
1053 /* mark EXCLUDE-mode sources */
1054 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1055         struct in6_addr *srcs)
1056 {
1057         struct ip6_sf_list *psf;
1058         int i, scount;
1059
1060         scount = 0;
1061         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1062                 if (scount == nsrcs)
1063                         break;
1064                 for (i=0; i<nsrcs; i++) {
1065                         /* skip inactive filters */
1066                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1067                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1068                             psf->sf_count[MCAST_EXCLUDE])
1069                                 continue;
1070                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1071                                 scount++;
1072                                 break;
1073                         }
1074                 }
1075         }
1076         pmc->mca_flags &= ~MAF_GSQUERY;
1077         if (scount == nsrcs)    /* all sources excluded */
1078                 return 0;
1079         return 1;
1080 }
1081
1082 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1083         struct in6_addr *srcs)
1084 {
1085         struct ip6_sf_list *psf;
1086         int i, scount;
1087
1088         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1089                 return mld_xmarksources(pmc, nsrcs, srcs);
1090
1091         /* mark INCLUDE-mode sources */
1092
1093         scount = 0;
1094         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1095                 if (scount == nsrcs)
1096                         break;
1097                 for (i=0; i<nsrcs; i++) {
1098                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1099                                 psf->sf_gsresp = 1;
1100                                 scount++;
1101                                 break;
1102                         }
1103                 }
1104         }
1105         if (!scount) {
1106                 pmc->mca_flags &= ~MAF_GSQUERY;
1107                 return 0;
1108         }
1109         pmc->mca_flags |= MAF_GSQUERY;
1110         return 1;
1111 }
1112
1113 /* called with rcu_read_lock() */
1114 int igmp6_event_query(struct sk_buff *skb)
1115 {
1116         struct mld2_query *mlh2 = NULL;
1117         struct ifmcaddr6 *ma;
1118         struct in6_addr *group;
1119         unsigned long max_delay;
1120         struct inet6_dev *idev;
1121         struct mld_msg *mld;
1122         int group_type;
1123         int mark = 0;
1124         int len;
1125
1126         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1127                 return -EINVAL;
1128
1129         /* compute payload length excluding extension headers */
1130         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1131         len -= skb_network_header_len(skb);
1132
1133         /* Drop queries with not link local source */
1134         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1135                 return -EINVAL;
1136
1137         idev = __in6_dev_get(skb->dev);
1138
1139         if (idev == NULL)
1140                 return 0;
1141
1142         mld = (struct mld_msg *)icmp6_hdr(skb);
1143         group = &mld->mld_mca;
1144         group_type = ipv6_addr_type(group);
1145
1146         if (group_type != IPV6_ADDR_ANY &&
1147             !(group_type&IPV6_ADDR_MULTICAST))
1148                 return -EINVAL;
1149
1150         if (len == 24) {
1151                 int switchback;
1152                 /* MLDv1 router present */
1153
1154                 /* Translate milliseconds to jiffies */
1155                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1156
1157                 switchback = (idev->mc_qrv + 1) * max_delay;
1158                 idev->mc_v1_seen = jiffies + switchback;
1159
1160                 /* cancel the interface change timer */
1161                 idev->mc_ifc_count = 0;
1162                 if (del_timer(&idev->mc_ifc_timer))
1163                         __in6_dev_put(idev);
1164                 /* clear deleted report items */
1165                 mld_clear_delrec(idev);
1166         } else if (len >= 28) {
1167                 int srcs_offset = sizeof(struct mld2_query) -
1168                                   sizeof(struct icmp6hdr);
1169                 if (!pskb_may_pull(skb, srcs_offset))
1170                         return -EINVAL;
1171
1172                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1173                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1174                 if (!max_delay)
1175                         max_delay = 1;
1176                 idev->mc_maxdelay = max_delay;
1177                 if (mlh2->mld2q_qrv)
1178                         idev->mc_qrv = mlh2->mld2q_qrv;
1179                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1180                         if (mlh2->mld2q_nsrcs)
1181                                 return -EINVAL; /* no sources allowed */
1182
1183                         mld_gq_start_timer(idev);
1184                         return 0;
1185                 }
1186                 /* mark sources to include, if group & source-specific */
1187                 if (mlh2->mld2q_nsrcs != 0) {
1188                         if (!pskb_may_pull(skb, srcs_offset +
1189                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1190                                 return -EINVAL;
1191
1192                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1193                         mark = 1;
1194                 }
1195         } else
1196                 return -EINVAL;
1197
1198         read_lock_bh(&idev->lock);
1199         if (group_type == IPV6_ADDR_ANY) {
1200                 for (ma = idev->mc_list; ma; ma=ma->next) {
1201                         spin_lock_bh(&ma->mca_lock);
1202                         igmp6_group_queried(ma, max_delay);
1203                         spin_unlock_bh(&ma->mca_lock);
1204                 }
1205         } else {
1206                 for (ma = idev->mc_list; ma; ma=ma->next) {
1207                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1208                                 continue;
1209                         spin_lock_bh(&ma->mca_lock);
1210                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1211                                 /* gsquery <- gsquery && mark */
1212                                 if (!mark)
1213                                         ma->mca_flags &= ~MAF_GSQUERY;
1214                         } else {
1215                                 /* gsquery <- mark */
1216                                 if (mark)
1217                                         ma->mca_flags |= MAF_GSQUERY;
1218                                 else
1219                                         ma->mca_flags &= ~MAF_GSQUERY;
1220                         }
1221                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1222                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1223                                 igmp6_group_queried(ma, max_delay);
1224                         spin_unlock_bh(&ma->mca_lock);
1225                         break;
1226                 }
1227         }
1228         read_unlock_bh(&idev->lock);
1229
1230         return 0;
1231 }
1232
1233 /* called with rcu_read_lock() */
1234 int igmp6_event_report(struct sk_buff *skb)
1235 {
1236         struct ifmcaddr6 *ma;
1237         struct inet6_dev *idev;
1238         struct mld_msg *mld;
1239         int addr_type;
1240
1241         /* Our own report looped back. Ignore it. */
1242         if (skb->pkt_type == PACKET_LOOPBACK)
1243                 return 0;
1244
1245         /* send our report if the MC router may not have heard this report */
1246         if (skb->pkt_type != PACKET_MULTICAST &&
1247             skb->pkt_type != PACKET_BROADCAST)
1248                 return 0;
1249
1250         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1251                 return -EINVAL;
1252
1253         mld = (struct mld_msg *)icmp6_hdr(skb);
1254
1255         /* Drop reports with not link local source */
1256         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1257         if (addr_type != IPV6_ADDR_ANY &&
1258             !(addr_type&IPV6_ADDR_LINKLOCAL))
1259                 return -EINVAL;
1260
1261         idev = __in6_dev_get(skb->dev);
1262         if (idev == NULL)
1263                 return -ENODEV;
1264
1265         /*
1266          *      Cancel the timer for this group
1267          */
1268
1269         read_lock_bh(&idev->lock);
1270         for (ma = idev->mc_list; ma; ma=ma->next) {
1271                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1272                         spin_lock(&ma->mca_lock);
1273                         if (del_timer(&ma->mca_timer))
1274                                 atomic_dec(&ma->mca_refcnt);
1275                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1276                         spin_unlock(&ma->mca_lock);
1277                         break;
1278                 }
1279         }
1280         read_unlock_bh(&idev->lock);
1281         return 0;
1282 }
1283
1284 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1285         int gdeleted, int sdeleted)
1286 {
1287         switch (type) {
1288         case MLD2_MODE_IS_INCLUDE:
1289         case MLD2_MODE_IS_EXCLUDE:
1290                 if (gdeleted || sdeleted)
1291                         return 0;
1292                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1293                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1294                                 return 1;
1295                         /* don't include if this source is excluded
1296                          * in all filters
1297                          */
1298                         if (psf->sf_count[MCAST_INCLUDE])
1299                                 return type == MLD2_MODE_IS_INCLUDE;
1300                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1301                                 psf->sf_count[MCAST_EXCLUDE];
1302                 }
1303                 return 0;
1304         case MLD2_CHANGE_TO_INCLUDE:
1305                 if (gdeleted || sdeleted)
1306                         return 0;
1307                 return psf->sf_count[MCAST_INCLUDE] != 0;
1308         case MLD2_CHANGE_TO_EXCLUDE:
1309                 if (gdeleted || sdeleted)
1310                         return 0;
1311                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1312                     psf->sf_count[MCAST_INCLUDE])
1313                         return 0;
1314                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1315                         psf->sf_count[MCAST_EXCLUDE];
1316         case MLD2_ALLOW_NEW_SOURCES:
1317                 if (gdeleted || !psf->sf_crcount)
1318                         return 0;
1319                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1320         case MLD2_BLOCK_OLD_SOURCES:
1321                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1322                         return gdeleted || (psf->sf_crcount && sdeleted);
1323                 return psf->sf_crcount && !gdeleted && !sdeleted;
1324         }
1325         return 0;
1326 }
1327
1328 static int
1329 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1330 {
1331         struct ip6_sf_list *psf;
1332         int scount = 0;
1333
1334         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1335                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1336                         continue;
1337                 scount++;
1338         }
1339         return scount;
1340 }
1341
1342 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1343 {
1344         struct net *net = dev_net(dev);
1345         struct sock *sk = net->ipv6.igmp_sk;
1346         struct sk_buff *skb;
1347         struct mld2_report *pmr;
1348         struct in6_addr addr_buf;
1349         const struct in6_addr *saddr;
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 += LL_ALLOCATED_SPACE(dev);
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, LL_RESERVED_SPACE(dev));
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         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1416
1417         if (!dst) {
1418                 err = -ENOMEM;
1419                 goto err_out;
1420         }
1421
1422         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1423                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1424                          skb->dev->ifindex);
1425
1426         dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1427         err = 0;
1428         if (IS_ERR(dst)) {
1429                 err = PTR_ERR(dst);
1430                 dst = NULL;
1431         }
1432         skb_dst_set(skb, dst);
1433         if (err)
1434                 goto err_out;
1435
1436         payload_len = skb->len;
1437
1438         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1439                       dst_output);
1440 out:
1441         if (!err) {
1442                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1443                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1444                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1445         } else
1446                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1447
1448         rcu_read_unlock();
1449         return;
1450
1451 err_out:
1452         kfree_skb(skb);
1453         goto out;
1454 }
1455
1456 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1457 {
1458         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1459 }
1460
1461 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1462         int type, struct mld2_grec **ppgr)
1463 {
1464         struct net_device *dev = pmc->idev->dev;
1465         struct mld2_report *pmr;
1466         struct mld2_grec *pgr;
1467
1468         if (!skb)
1469                 skb = mld_newpack(dev, dev->mtu);
1470         if (!skb)
1471                 return NULL;
1472         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1473         pgr->grec_type = type;
1474         pgr->grec_auxwords = 0;
1475         pgr->grec_nsrcs = 0;
1476         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1477         pmr = (struct mld2_report *)skb_transport_header(skb);
1478         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1479         *ppgr = pgr;
1480         return skb;
1481 }
1482
1483 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1484         skb_tailroom(skb)) : 0)
1485
1486 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1487         int type, int gdeleted, int sdeleted)
1488 {
1489         struct net_device *dev = pmc->idev->dev;
1490         struct mld2_report *pmr;
1491         struct mld2_grec *pgr = NULL;
1492         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1493         int scount, stotal, first, isquery, truncate;
1494
1495         if (pmc->mca_flags & MAF_NOREPORT)
1496                 return skb;
1497
1498         isquery = type == MLD2_MODE_IS_INCLUDE ||
1499                   type == MLD2_MODE_IS_EXCLUDE;
1500         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1501                     type == MLD2_CHANGE_TO_EXCLUDE;
1502
1503         stotal = scount = 0;
1504
1505         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1506
1507         if (!*psf_list)
1508                 goto empty_source;
1509
1510         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1511
1512         /* EX and TO_EX get a fresh packet, if needed */
1513         if (truncate) {
1514                 if (pmr && pmr->mld2r_ngrec &&
1515                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1516                         if (skb)
1517                                 mld_sendpack(skb);
1518                         skb = mld_newpack(dev, dev->mtu);
1519                 }
1520         }
1521         first = 1;
1522         psf_prev = NULL;
1523         for (psf=*psf_list; psf; psf=psf_next) {
1524                 struct in6_addr *psrc;
1525
1526                 psf_next = psf->sf_next;
1527
1528                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1529                         psf_prev = psf;
1530                         continue;
1531                 }
1532
1533                 /* clear marks on query responses */
1534                 if (isquery)
1535                         psf->sf_gsresp = 0;
1536
1537                 if (AVAILABLE(skb) < sizeof(*psrc) +
1538                     first*sizeof(struct mld2_grec)) {
1539                         if (truncate && !first)
1540                                 break;   /* truncate these */
1541                         if (pgr)
1542                                 pgr->grec_nsrcs = htons(scount);
1543                         if (skb)
1544                                 mld_sendpack(skb);
1545                         skb = mld_newpack(dev, dev->mtu);
1546                         first = 1;
1547                         scount = 0;
1548                 }
1549                 if (first) {
1550                         skb = add_grhead(skb, pmc, type, &pgr);
1551                         first = 0;
1552                 }
1553                 if (!skb)
1554                         return NULL;
1555                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1556                 *psrc = psf->sf_addr;
1557                 scount++; stotal++;
1558                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1559                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1560                         psf->sf_crcount--;
1561                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1562                                 if (psf_prev)
1563                                         psf_prev->sf_next = psf->sf_next;
1564                                 else
1565                                         *psf_list = psf->sf_next;
1566                                 kfree(psf);
1567                                 continue;
1568                         }
1569                 }
1570                 psf_prev = psf;
1571         }
1572
1573 empty_source:
1574         if (!stotal) {
1575                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1576                     type == MLD2_BLOCK_OLD_SOURCES)
1577                         return skb;
1578                 if (pmc->mca_crcount || isquery) {
1579                         /* make sure we have room for group header */
1580                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1581                                 mld_sendpack(skb);
1582                                 skb = NULL; /* add_grhead will get a new one */
1583                         }
1584                         skb = add_grhead(skb, pmc, type, &pgr);
1585                 }
1586         }
1587         if (pgr)
1588                 pgr->grec_nsrcs = htons(scount);
1589
1590         if (isquery)
1591                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1592         return skb;
1593 }
1594
1595 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1596 {
1597         struct sk_buff *skb = NULL;
1598         int type;
1599
1600         if (!pmc) {
1601                 read_lock_bh(&idev->lock);
1602                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1603                         if (pmc->mca_flags & MAF_NOREPORT)
1604                                 continue;
1605                         spin_lock_bh(&pmc->mca_lock);
1606                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1607                                 type = MLD2_MODE_IS_EXCLUDE;
1608                         else
1609                                 type = MLD2_MODE_IS_INCLUDE;
1610                         skb = add_grec(skb, pmc, type, 0, 0);
1611                         spin_unlock_bh(&pmc->mca_lock);
1612                 }
1613                 read_unlock_bh(&idev->lock);
1614         } else {
1615                 spin_lock_bh(&pmc->mca_lock);
1616                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1617                         type = MLD2_MODE_IS_EXCLUDE;
1618                 else
1619                         type = MLD2_MODE_IS_INCLUDE;
1620                 skb = add_grec(skb, pmc, type, 0, 0);
1621                 spin_unlock_bh(&pmc->mca_lock);
1622         }
1623         if (skb)
1624                 mld_sendpack(skb);
1625 }
1626
1627 /*
1628  * remove zero-count source records from a source filter list
1629  */
1630 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1631 {
1632         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1633
1634         psf_prev = NULL;
1635         for (psf=*ppsf; psf; psf = psf_next) {
1636                 psf_next = psf->sf_next;
1637                 if (psf->sf_crcount == 0) {
1638                         if (psf_prev)
1639                                 psf_prev->sf_next = psf->sf_next;
1640                         else
1641                                 *ppsf = psf->sf_next;
1642                         kfree(psf);
1643                 } else
1644                         psf_prev = psf;
1645         }
1646 }
1647
1648 static void mld_send_cr(struct inet6_dev *idev)
1649 {
1650         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1651         struct sk_buff *skb = NULL;
1652         int type, dtype;
1653
1654         read_lock_bh(&idev->lock);
1655         spin_lock(&idev->mc_lock);
1656
1657         /* deleted MCA's */
1658         pmc_prev = NULL;
1659         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1660                 pmc_next = pmc->next;
1661                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1662                         type = MLD2_BLOCK_OLD_SOURCES;
1663                         dtype = MLD2_BLOCK_OLD_SOURCES;
1664                         skb = add_grec(skb, pmc, type, 1, 0);
1665                         skb = add_grec(skb, pmc, dtype, 1, 1);
1666                 }
1667                 if (pmc->mca_crcount) {
1668                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1669                                 type = MLD2_CHANGE_TO_INCLUDE;
1670                                 skb = add_grec(skb, pmc, type, 1, 0);
1671                         }
1672                         pmc->mca_crcount--;
1673                         if (pmc->mca_crcount == 0) {
1674                                 mld_clear_zeros(&pmc->mca_tomb);
1675                                 mld_clear_zeros(&pmc->mca_sources);
1676                         }
1677                 }
1678                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1679                     !pmc->mca_sources) {
1680                         if (pmc_prev)
1681                                 pmc_prev->next = pmc_next;
1682                         else
1683                                 idev->mc_tomb = pmc_next;
1684                         in6_dev_put(pmc->idev);
1685                         kfree(pmc);
1686                 } else
1687                         pmc_prev = pmc;
1688         }
1689         spin_unlock(&idev->mc_lock);
1690
1691         /* change recs */
1692         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1693                 spin_lock_bh(&pmc->mca_lock);
1694                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1695                         type = MLD2_BLOCK_OLD_SOURCES;
1696                         dtype = MLD2_ALLOW_NEW_SOURCES;
1697                 } else {
1698                         type = MLD2_ALLOW_NEW_SOURCES;
1699                         dtype = MLD2_BLOCK_OLD_SOURCES;
1700                 }
1701                 skb = add_grec(skb, pmc, type, 0, 0);
1702                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1703
1704                 /* filter mode changes */
1705                 if (pmc->mca_crcount) {
1706                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1707                                 type = MLD2_CHANGE_TO_EXCLUDE;
1708                         else
1709                                 type = MLD2_CHANGE_TO_INCLUDE;
1710                         skb = add_grec(skb, pmc, type, 0, 0);
1711                         pmc->mca_crcount--;
1712                 }
1713                 spin_unlock_bh(&pmc->mca_lock);
1714         }
1715         read_unlock_bh(&idev->lock);
1716         if (!skb)
1717                 return;
1718         (void) mld_sendpack(skb);
1719 }
1720
1721 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1722 {
1723         struct net *net = dev_net(dev);
1724         struct sock *sk = net->ipv6.igmp_sk;
1725         struct inet6_dev *idev;
1726         struct sk_buff *skb;
1727         struct mld_msg *hdr;
1728         const struct in6_addr *snd_addr, *saddr;
1729         struct in6_addr addr_buf;
1730         int err, len, payload_len, full_len;
1731         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1732                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1733                      IPV6_TLV_PADN, 0 };
1734         struct flowi6 fl6;
1735         struct dst_entry *dst;
1736
1737         if (type == ICMPV6_MGM_REDUCTION)
1738                 snd_addr = &in6addr_linklocal_allrouters;
1739         else
1740                 snd_addr = addr;
1741
1742         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1743         payload_len = len + sizeof(ra);
1744         full_len = sizeof(struct ipv6hdr) + payload_len;
1745
1746         rcu_read_lock();
1747         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1748                       IPSTATS_MIB_OUT, full_len);
1749         rcu_read_unlock();
1750
1751         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1752
1753         if (skb == NULL) {
1754                 rcu_read_lock();
1755                 IP6_INC_STATS(net, __in6_dev_get(dev),
1756                               IPSTATS_MIB_OUTDISCARDS);
1757                 rcu_read_unlock();
1758                 return;
1759         }
1760
1761         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1762
1763         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1764                 /* <draft-ietf-magma-mld-source-05.txt>:
1765                  * use unspecified address as the source address
1766                  * when a valid link-local address is not available.
1767                  */
1768                 saddr = &in6addr_any;
1769         } else
1770                 saddr = &addr_buf;
1771
1772         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1773
1774         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1775
1776         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1777         memset(hdr, 0, sizeof(struct mld_msg));
1778         hdr->mld_type = type;
1779         ipv6_addr_copy(&hdr->mld_mca, addr);
1780
1781         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1782                                          IPPROTO_ICMPV6,
1783                                          csum_partial(hdr, len, 0));
1784
1785         rcu_read_lock();
1786         idev = __in6_dev_get(skb->dev);
1787
1788         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1789         if (!dst) {
1790                 err = -ENOMEM;
1791                 goto err_out;
1792         }
1793
1794         icmpv6_flow_init(sk, &fl6, type,
1795                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1796                          skb->dev->ifindex);
1797
1798         dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1799         if (IS_ERR(dst)) {
1800                 err = PTR_ERR(dst);
1801                 goto err_out;
1802         }
1803
1804         skb_dst_set(skb, dst);
1805         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1806                       dst_output);
1807 out:
1808         if (!err) {
1809                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1810                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1811                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1812         } else
1813                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1814
1815         rcu_read_unlock();
1816         return;
1817
1818 err_out:
1819         kfree_skb(skb);
1820         goto out;
1821 }
1822
1823 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1824         struct in6_addr *psfsrc)
1825 {
1826         struct ip6_sf_list *psf, *psf_prev;
1827         int rv = 0;
1828
1829         psf_prev = NULL;
1830         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1831                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1832                         break;
1833                 psf_prev = psf;
1834         }
1835         if (!psf || psf->sf_count[sfmode] == 0) {
1836                 /* source filter not found, or count wrong =>  bug */
1837                 return -ESRCH;
1838         }
1839         psf->sf_count[sfmode]--;
1840         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1841                 struct inet6_dev *idev = pmc->idev;
1842
1843                 /* no more filters for this source */
1844                 if (psf_prev)
1845                         psf_prev->sf_next = psf->sf_next;
1846                 else
1847                         pmc->mca_sources = psf->sf_next;
1848                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1849                     !MLD_V1_SEEN(idev)) {
1850                         psf->sf_crcount = idev->mc_qrv;
1851                         psf->sf_next = pmc->mca_tomb;
1852                         pmc->mca_tomb = psf;
1853                         rv = 1;
1854                 } else
1855                         kfree(psf);
1856         }
1857         return rv;
1858 }
1859
1860 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1861                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1862                           int delta)
1863 {
1864         struct ifmcaddr6 *pmc;
1865         int     changerec = 0;
1866         int     i, err;
1867
1868         if (!idev)
1869                 return -ENODEV;
1870         read_lock_bh(&idev->lock);
1871         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1872                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1873                         break;
1874         }
1875         if (!pmc) {
1876                 /* MCA not found?? bug */
1877                 read_unlock_bh(&idev->lock);
1878                 return -ESRCH;
1879         }
1880         spin_lock_bh(&pmc->mca_lock);
1881         sf_markstate(pmc);
1882         if (!delta) {
1883                 if (!pmc->mca_sfcount[sfmode]) {
1884                         spin_unlock_bh(&pmc->mca_lock);
1885                         read_unlock_bh(&idev->lock);
1886                         return -EINVAL;
1887                 }
1888                 pmc->mca_sfcount[sfmode]--;
1889         }
1890         err = 0;
1891         for (i=0; i<sfcount; i++) {
1892                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1893
1894                 changerec |= rv > 0;
1895                 if (!err && rv < 0)
1896                         err = rv;
1897         }
1898         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1899             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1900             pmc->mca_sfcount[MCAST_INCLUDE]) {
1901                 struct ip6_sf_list *psf;
1902
1903                 /* filter mode change */
1904                 pmc->mca_sfmode = MCAST_INCLUDE;
1905                 pmc->mca_crcount = idev->mc_qrv;
1906                 idev->mc_ifc_count = pmc->mca_crcount;
1907                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1908                         psf->sf_crcount = 0;
1909                 mld_ifc_event(pmc->idev);
1910         } else if (sf_setstate(pmc) || changerec)
1911                 mld_ifc_event(pmc->idev);
1912         spin_unlock_bh(&pmc->mca_lock);
1913         read_unlock_bh(&idev->lock);
1914         return err;
1915 }
1916
1917 /*
1918  * Add multicast single-source filter to the interface list
1919  */
1920 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1921         struct in6_addr *psfsrc, int delta)
1922 {
1923         struct ip6_sf_list *psf, *psf_prev;
1924
1925         psf_prev = NULL;
1926         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1927                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1928                         break;
1929                 psf_prev = psf;
1930         }
1931         if (!psf) {
1932                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1933                 if (!psf)
1934                         return -ENOBUFS;
1935
1936                 psf->sf_addr = *psfsrc;
1937                 if (psf_prev) {
1938                         psf_prev->sf_next = psf;
1939                 } else
1940                         pmc->mca_sources = psf;
1941         }
1942         psf->sf_count[sfmode]++;
1943         return 0;
1944 }
1945
1946 static void sf_markstate(struct ifmcaddr6 *pmc)
1947 {
1948         struct ip6_sf_list *psf;
1949         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1950
1951         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1952                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1953                         psf->sf_oldin = mca_xcount ==
1954                                 psf->sf_count[MCAST_EXCLUDE] &&
1955                                 !psf->sf_count[MCAST_INCLUDE];
1956                 } else
1957                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1958 }
1959
1960 static int sf_setstate(struct ifmcaddr6 *pmc)
1961 {
1962         struct ip6_sf_list *psf, *dpsf;
1963         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1964         int qrv = pmc->idev->mc_qrv;
1965         int new_in, rv;
1966
1967         rv = 0;
1968         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1969                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1970                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1971                                 !psf->sf_count[MCAST_INCLUDE];
1972                 } else
1973                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1974                 if (new_in) {
1975                         if (!psf->sf_oldin) {
1976                                 struct ip6_sf_list *prev = NULL;
1977
1978                                 for (dpsf=pmc->mca_tomb; dpsf;
1979                                      dpsf=dpsf->sf_next) {
1980                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1981                                             &psf->sf_addr))
1982                                                 break;
1983                                         prev = dpsf;
1984                                 }
1985                                 if (dpsf) {
1986                                         if (prev)
1987                                                 prev->sf_next = dpsf->sf_next;
1988                                         else
1989                                                 pmc->mca_tomb = dpsf->sf_next;
1990                                         kfree(dpsf);
1991                                 }
1992                                 psf->sf_crcount = qrv;
1993                                 rv++;
1994                         }
1995                 } else if (psf->sf_oldin) {
1996                         psf->sf_crcount = 0;
1997                         /*
1998                          * add or update "delete" records if an active filter
1999                          * is now inactive
2000                          */
2001                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2002                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2003                                     &psf->sf_addr))
2004                                         break;
2005                         if (!dpsf) {
2006                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2007                                 if (!dpsf)
2008                                         continue;
2009                                 *dpsf = *psf;
2010                                 /* pmc->mca_lock held by callers */
2011                                 dpsf->sf_next = pmc->mca_tomb;
2012                                 pmc->mca_tomb = dpsf;
2013                         }
2014                         dpsf->sf_crcount = qrv;
2015                         rv++;
2016                 }
2017         }
2018         return rv;
2019 }
2020
2021 /*
2022  * Add multicast source filter list to the interface list
2023  */
2024 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2025                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2026                           int delta)
2027 {
2028         struct ifmcaddr6 *pmc;
2029         int     isexclude;
2030         int     i, err;
2031
2032         if (!idev)
2033                 return -ENODEV;
2034         read_lock_bh(&idev->lock);
2035         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2036                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2037                         break;
2038         }
2039         if (!pmc) {
2040                 /* MCA not found?? bug */
2041                 read_unlock_bh(&idev->lock);
2042                 return -ESRCH;
2043         }
2044         spin_lock_bh(&pmc->mca_lock);
2045
2046         sf_markstate(pmc);
2047         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2048         if (!delta)
2049                 pmc->mca_sfcount[sfmode]++;
2050         err = 0;
2051         for (i=0; i<sfcount; i++) {
2052                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2053                 if (err)
2054                         break;
2055         }
2056         if (err) {
2057                 int j;
2058
2059                 if (!delta)
2060                         pmc->mca_sfcount[sfmode]--;
2061                 for (j=0; j<i; j++)
2062                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2063         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2064                 struct ip6_sf_list *psf;
2065
2066                 /* filter mode change */
2067                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2068                         pmc->mca_sfmode = MCAST_EXCLUDE;
2069                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2070                         pmc->mca_sfmode = MCAST_INCLUDE;
2071                 /* else no filters; keep old mode for reports */
2072
2073                 pmc->mca_crcount = idev->mc_qrv;
2074                 idev->mc_ifc_count = pmc->mca_crcount;
2075                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2076                         psf->sf_crcount = 0;
2077                 mld_ifc_event(idev);
2078         } else if (sf_setstate(pmc))
2079                 mld_ifc_event(idev);
2080         spin_unlock_bh(&pmc->mca_lock);
2081         read_unlock_bh(&idev->lock);
2082         return err;
2083 }
2084
2085 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2086 {
2087         struct ip6_sf_list *psf, *nextpsf;
2088
2089         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2090                 nextpsf = psf->sf_next;
2091                 kfree(psf);
2092         }
2093         pmc->mca_tomb = NULL;
2094         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2095                 nextpsf = psf->sf_next;
2096                 kfree(psf);
2097         }
2098         pmc->mca_sources = NULL;
2099         pmc->mca_sfmode = MCAST_EXCLUDE;
2100         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2101         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2102 }
2103
2104
2105 static void igmp6_join_group(struct ifmcaddr6 *ma)
2106 {
2107         unsigned long delay;
2108
2109         if (ma->mca_flags & MAF_NOREPORT)
2110                 return;
2111
2112         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2113
2114         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2115
2116         spin_lock_bh(&ma->mca_lock);
2117         if (del_timer(&ma->mca_timer)) {
2118                 atomic_dec(&ma->mca_refcnt);
2119                 delay = ma->mca_timer.expires - jiffies;
2120         }
2121
2122         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2123                 atomic_inc(&ma->mca_refcnt);
2124         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2125         spin_unlock_bh(&ma->mca_lock);
2126 }
2127
2128 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2129                             struct inet6_dev *idev)
2130 {
2131         int err;
2132
2133         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2134          * so no other readers or writers of iml or its sflist
2135          */
2136         if (!iml->sflist) {
2137                 /* any-source empty exclude case */
2138                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2139         }
2140         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2141                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2142         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2143         iml->sflist = NULL;
2144         return err;
2145 }
2146
2147 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2148 {
2149         if (MLD_V1_SEEN(ma->idev)) {
2150                 if (ma->mca_flags & MAF_LAST_REPORTER)
2151                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2152                                 ICMPV6_MGM_REDUCTION);
2153         } else {
2154                 mld_add_delrec(ma->idev, ma);
2155                 mld_ifc_event(ma->idev);
2156         }
2157 }
2158
2159 static void mld_gq_timer_expire(unsigned long data)
2160 {
2161         struct inet6_dev *idev = (struct inet6_dev *)data;
2162
2163         idev->mc_gq_running = 0;
2164         mld_send_report(idev, NULL);
2165         __in6_dev_put(idev);
2166 }
2167
2168 static void mld_ifc_timer_expire(unsigned long data)
2169 {
2170         struct inet6_dev *idev = (struct inet6_dev *)data;
2171
2172         mld_send_cr(idev);
2173         if (idev->mc_ifc_count) {
2174                 idev->mc_ifc_count--;
2175                 if (idev->mc_ifc_count)
2176                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2177         }
2178         __in6_dev_put(idev);
2179 }
2180
2181 static void mld_ifc_event(struct inet6_dev *idev)
2182 {
2183         if (MLD_V1_SEEN(idev))
2184                 return;
2185         idev->mc_ifc_count = idev->mc_qrv;
2186         mld_ifc_start_timer(idev, 1);
2187 }
2188
2189
2190 static void igmp6_timer_handler(unsigned long data)
2191 {
2192         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2193
2194         if (MLD_V1_SEEN(ma->idev))
2195                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2196         else
2197                 mld_send_report(ma->idev, ma);
2198
2199         spin_lock(&ma->mca_lock);
2200         ma->mca_flags |=  MAF_LAST_REPORTER;
2201         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2202         spin_unlock(&ma->mca_lock);
2203         ma_put(ma);
2204 }
2205
2206 /* Device changing type */
2207
2208 void ipv6_mc_unmap(struct inet6_dev *idev)
2209 {
2210         struct ifmcaddr6 *i;
2211
2212         /* Install multicast list, except for all-nodes (already installed) */
2213
2214         read_lock_bh(&idev->lock);
2215         for (i = idev->mc_list; i; i = i->next)
2216                 igmp6_group_dropped(i);
2217         read_unlock_bh(&idev->lock);
2218 }
2219
2220 void ipv6_mc_remap(struct inet6_dev *idev)
2221 {
2222         ipv6_mc_up(idev);
2223 }
2224
2225 /* Device going down */
2226
2227 void ipv6_mc_down(struct inet6_dev *idev)
2228 {
2229         struct ifmcaddr6 *i;
2230
2231         /* Withdraw multicast list */
2232
2233         read_lock_bh(&idev->lock);
2234         idev->mc_ifc_count = 0;
2235         if (del_timer(&idev->mc_ifc_timer))
2236                 __in6_dev_put(idev);
2237         idev->mc_gq_running = 0;
2238         if (del_timer(&idev->mc_gq_timer))
2239                 __in6_dev_put(idev);
2240
2241         for (i = idev->mc_list; i; i=i->next)
2242                 igmp6_group_dropped(i);
2243         read_unlock_bh(&idev->lock);
2244
2245         mld_clear_delrec(idev);
2246 }
2247
2248
2249 /* Device going up */
2250
2251 void ipv6_mc_up(struct inet6_dev *idev)
2252 {
2253         struct ifmcaddr6 *i;
2254
2255         /* Install multicast list, except for all-nodes (already installed) */
2256
2257         read_lock_bh(&idev->lock);
2258         for (i = idev->mc_list; i; i=i->next)
2259                 igmp6_group_added(i);
2260         read_unlock_bh(&idev->lock);
2261 }
2262
2263 /* IPv6 device initialization. */
2264
2265 void ipv6_mc_init_dev(struct inet6_dev *idev)
2266 {
2267         write_lock_bh(&idev->lock);
2268         spin_lock_init(&idev->mc_lock);
2269         idev->mc_gq_running = 0;
2270         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2271                         (unsigned long)idev);
2272         idev->mc_tomb = NULL;
2273         idev->mc_ifc_count = 0;
2274         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2275                         (unsigned long)idev);
2276         idev->mc_qrv = MLD_QRV_DEFAULT;
2277         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2278         idev->mc_v1_seen = 0;
2279         write_unlock_bh(&idev->lock);
2280 }
2281
2282 /*
2283  *      Device is about to be destroyed: clean up.
2284  */
2285
2286 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2287 {
2288         struct ifmcaddr6 *i;
2289
2290         /* Deactivate timers */
2291         ipv6_mc_down(idev);
2292
2293         /* Delete all-nodes address. */
2294         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2295          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2296          * fail.
2297          */
2298         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2299
2300         if (idev->cnf.forwarding)
2301                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2302
2303         write_lock_bh(&idev->lock);
2304         while ((i = idev->mc_list) != NULL) {
2305                 idev->mc_list = i->next;
2306                 write_unlock_bh(&idev->lock);
2307
2308                 igmp6_group_dropped(i);
2309                 ma_put(i);
2310
2311                 write_lock_bh(&idev->lock);
2312         }
2313         write_unlock_bh(&idev->lock);
2314 }
2315
2316 #ifdef CONFIG_PROC_FS
2317 struct igmp6_mc_iter_state {
2318         struct seq_net_private p;
2319         struct net_device *dev;
2320         struct inet6_dev *idev;
2321 };
2322
2323 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2324
2325 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2326 {
2327         struct ifmcaddr6 *im = NULL;
2328         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2329         struct net *net = seq_file_net(seq);
2330
2331         state->idev = NULL;
2332         for_each_netdev_rcu(net, state->dev) {
2333                 struct inet6_dev *idev;
2334                 idev = __in6_dev_get(state->dev);
2335                 if (!idev)
2336                         continue;
2337                 read_lock_bh(&idev->lock);
2338                 im = idev->mc_list;
2339                 if (im) {
2340                         state->idev = idev;
2341                         break;
2342                 }
2343                 read_unlock_bh(&idev->lock);
2344         }
2345         return im;
2346 }
2347
2348 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2349 {
2350         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2351
2352         im = im->next;
2353         while (!im) {
2354                 if (likely(state->idev != NULL))
2355                         read_unlock_bh(&state->idev->lock);
2356
2357                 state->dev = next_net_device_rcu(state->dev);
2358                 if (!state->dev) {
2359                         state->idev = NULL;
2360                         break;
2361                 }
2362                 state->idev = __in6_dev_get(state->dev);
2363                 if (!state->idev)
2364                         continue;
2365                 read_lock_bh(&state->idev->lock);
2366                 im = state->idev->mc_list;
2367         }
2368         return im;
2369 }
2370
2371 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2372 {
2373         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2374         if (im)
2375                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2376                         --pos;
2377         return pos ? NULL : im;
2378 }
2379
2380 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2381         __acquires(RCU)
2382 {
2383         rcu_read_lock();
2384         return igmp6_mc_get_idx(seq, *pos);
2385 }
2386
2387 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2388 {
2389         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2390
2391         ++*pos;
2392         return im;
2393 }
2394
2395 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2396         __releases(RCU)
2397 {
2398         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2399
2400         if (likely(state->idev != NULL)) {
2401                 read_unlock_bh(&state->idev->lock);
2402                 state->idev = NULL;
2403         }
2404         state->dev = NULL;
2405         rcu_read_unlock();
2406 }
2407
2408 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2409 {
2410         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2411         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2412
2413         seq_printf(seq,
2414                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2415                    state->dev->ifindex, state->dev->name,
2416                    &im->mca_addr,
2417                    im->mca_users, im->mca_flags,
2418                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2419                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2420         return 0;
2421 }
2422
2423 static const struct seq_operations igmp6_mc_seq_ops = {
2424         .start  =       igmp6_mc_seq_start,
2425         .next   =       igmp6_mc_seq_next,
2426         .stop   =       igmp6_mc_seq_stop,
2427         .show   =       igmp6_mc_seq_show,
2428 };
2429
2430 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2431 {
2432         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2433                             sizeof(struct igmp6_mc_iter_state));
2434 }
2435
2436 static const struct file_operations igmp6_mc_seq_fops = {
2437         .owner          =       THIS_MODULE,
2438         .open           =       igmp6_mc_seq_open,
2439         .read           =       seq_read,
2440         .llseek         =       seq_lseek,
2441         .release        =       seq_release_net,
2442 };
2443
2444 struct igmp6_mcf_iter_state {
2445         struct seq_net_private p;
2446         struct net_device *dev;
2447         struct inet6_dev *idev;
2448         struct ifmcaddr6 *im;
2449 };
2450
2451 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2452
2453 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2454 {
2455         struct ip6_sf_list *psf = NULL;
2456         struct ifmcaddr6 *im = NULL;
2457         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2458         struct net *net = seq_file_net(seq);
2459
2460         state->idev = NULL;
2461         state->im = NULL;
2462         for_each_netdev_rcu(net, state->dev) {
2463                 struct inet6_dev *idev;
2464                 idev = __in6_dev_get(state->dev);
2465                 if (unlikely(idev == NULL))
2466                         continue;
2467                 read_lock_bh(&idev->lock);
2468                 im = idev->mc_list;
2469                 if (likely(im != NULL)) {
2470                         spin_lock_bh(&im->mca_lock);
2471                         psf = im->mca_sources;
2472                         if (likely(psf != NULL)) {
2473                                 state->im = im;
2474                                 state->idev = idev;
2475                                 break;
2476                         }
2477                         spin_unlock_bh(&im->mca_lock);
2478                 }
2479                 read_unlock_bh(&idev->lock);
2480         }
2481         return psf;
2482 }
2483
2484 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2485 {
2486         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2487
2488         psf = psf->sf_next;
2489         while (!psf) {
2490                 spin_unlock_bh(&state->im->mca_lock);
2491                 state->im = state->im->next;
2492                 while (!state->im) {
2493                         if (likely(state->idev != NULL))
2494                                 read_unlock_bh(&state->idev->lock);
2495
2496                         state->dev = next_net_device_rcu(state->dev);
2497                         if (!state->dev) {
2498                                 state->idev = NULL;
2499                                 goto out;
2500                         }
2501                         state->idev = __in6_dev_get(state->dev);
2502                         if (!state->idev)
2503                                 continue;
2504                         read_lock_bh(&state->idev->lock);
2505                         state->im = state->idev->mc_list;
2506                 }
2507                 if (!state->im)
2508                         break;
2509                 spin_lock_bh(&state->im->mca_lock);
2510                 psf = state->im->mca_sources;
2511         }
2512 out:
2513         return psf;
2514 }
2515
2516 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2517 {
2518         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2519         if (psf)
2520                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2521                         --pos;
2522         return pos ? NULL : psf;
2523 }
2524
2525 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2526         __acquires(RCU)
2527 {
2528         rcu_read_lock();
2529         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2530 }
2531
2532 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2533 {
2534         struct ip6_sf_list *psf;
2535         if (v == SEQ_START_TOKEN)
2536                 psf = igmp6_mcf_get_first(seq);
2537         else
2538                 psf = igmp6_mcf_get_next(seq, v);
2539         ++*pos;
2540         return psf;
2541 }
2542
2543 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2544         __releases(RCU)
2545 {
2546         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2547         if (likely(state->im != NULL)) {
2548                 spin_unlock_bh(&state->im->mca_lock);
2549                 state->im = NULL;
2550         }
2551         if (likely(state->idev != NULL)) {
2552                 read_unlock_bh(&state->idev->lock);
2553                 state->idev = NULL;
2554         }
2555         state->dev = NULL;
2556         rcu_read_unlock();
2557 }
2558
2559 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2560 {
2561         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2562         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2563
2564         if (v == SEQ_START_TOKEN) {
2565                 seq_printf(seq,
2566                            "%3s %6s "
2567                            "%32s %32s %6s %6s\n", "Idx",
2568                            "Device", "Multicast Address",
2569                            "Source Address", "INC", "EXC");
2570         } else {
2571                 seq_printf(seq,
2572                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2573                            state->dev->ifindex, state->dev->name,
2574                            &state->im->mca_addr,
2575                            &psf->sf_addr,
2576                            psf->sf_count[MCAST_INCLUDE],
2577                            psf->sf_count[MCAST_EXCLUDE]);
2578         }
2579         return 0;
2580 }
2581
2582 static const struct seq_operations igmp6_mcf_seq_ops = {
2583         .start  =       igmp6_mcf_seq_start,
2584         .next   =       igmp6_mcf_seq_next,
2585         .stop   =       igmp6_mcf_seq_stop,
2586         .show   =       igmp6_mcf_seq_show,
2587 };
2588
2589 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2590 {
2591         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2592                             sizeof(struct igmp6_mcf_iter_state));
2593 }
2594
2595 static const struct file_operations igmp6_mcf_seq_fops = {
2596         .owner          =       THIS_MODULE,
2597         .open           =       igmp6_mcf_seq_open,
2598         .read           =       seq_read,
2599         .llseek         =       seq_lseek,
2600         .release        =       seq_release_net,
2601 };
2602
2603 static int __net_init igmp6_proc_init(struct net *net)
2604 {
2605         int err;
2606
2607         err = -ENOMEM;
2608         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2609                 goto out;
2610         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2611                                   &igmp6_mcf_seq_fops))
2612                 goto out_proc_net_igmp6;
2613
2614         err = 0;
2615 out:
2616         return err;
2617
2618 out_proc_net_igmp6:
2619         proc_net_remove(net, "igmp6");
2620         goto out;
2621 }
2622
2623 static void __net_exit igmp6_proc_exit(struct net *net)
2624 {
2625         proc_net_remove(net, "mcfilter6");
2626         proc_net_remove(net, "igmp6");
2627 }
2628 #else
2629 static inline int igmp6_proc_init(struct net *net)
2630 {
2631         return 0;
2632 }
2633 static inline void igmp6_proc_exit(struct net *net)
2634 {
2635 }
2636 #endif
2637
2638 static int __net_init igmp6_net_init(struct net *net)
2639 {
2640         int err;
2641
2642         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2643                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2644         if (err < 0) {
2645                 printk(KERN_ERR
2646                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2647                        err);
2648                 goto out;
2649         }
2650
2651         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2652
2653         err = igmp6_proc_init(net);
2654         if (err)
2655                 goto out_sock_create;
2656 out:
2657         return err;
2658
2659 out_sock_create:
2660         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2661         goto out;
2662 }
2663
2664 static void __net_exit igmp6_net_exit(struct net *net)
2665 {
2666         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2667         igmp6_proc_exit(net);
2668 }
2669
2670 static struct pernet_operations igmp6_net_ops = {
2671         .init = igmp6_net_init,
2672         .exit = igmp6_net_exit,
2673 };
2674
2675 int __init igmp6_init(void)
2676 {
2677         return register_pernet_subsys(&igmp6_net_ops);
2678 }
2679
2680 void igmp6_cleanup(void)
2681 {
2682         unregister_pernet_subsys(&igmp6_net_ops);
2683 }