net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <net/mld.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/net_namespace.h>
  53 #include <net/sock.h>
  54 #include <net/snmp.h>
  55
  56 #include <net/ipv6.h>
  57 #include <net/protocol.h>
  58 #include <net/if_inet6.h>
  59 #include <net/ndisc.h>
  60 #include <net/addrconf.h>
  61 #include <net/ip6_route.h>
  62 #include <net/inet_common.h>
  63
  64 #include <net/ip6_checksum.h>
  65
  66 /* Set to 3 to get tracing... */
  67 #define MCAST_DEBUG 2
  68
  69 #if MCAST_DEBUG >= 3
  70 #define MDBG(x) printk x
  71 #else
  72 #define MDBG(x)
  73 #endif
  74
  75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  77         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  80 };
  81
  82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84 /* Big mc list lock for all the sockets */
  85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  86
  87 static void igmp6_join_group(struct ifmcaddr6 *ma);
  88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89 static void igmp6_timer_handler(unsigned long data);
  90
  91 static void mld_gq_timer_expire(unsigned long data);
  92 static void mld_ifc_timer_expire(unsigned long data);
  93 static void mld_ifc_event(struct inet6_dev *idev);
  94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  96 static void mld_clear_delrec(struct inet6_dev *idev);
  97 static int sf_setstate(struct ifmcaddr6 *pmc);
  98 static void sf_markstate(struct ifmcaddr6 *pmc);
  99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 101                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 102                           int delta);
 103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 104                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 105                           int delta);
 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 107                             struct inet6_dev *idev);
 108
 109
 110 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 111 #define MLD_QRV_DEFAULT         2
 112
 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 114                 (idev)->cnf.force_mld_version == 1 || \
 115                 ((idev)->mc_v1_seen && \
 116                 time_before(jiffies, (idev)->mc_v1_seen)))
 117
 118 #define IPV6_MLD_MAX_MSF        64
 119
 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 121
 122 /*
 123  *      socket join on multicast group
 124  */
 125
 126 #define for_each_pmc_rcu(np, pmc)                               \
 127         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 128              pmc != NULL;                                       \
 129              pmc = rcu_dereference(pmc->next))
 130
 131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 132 {
 133         struct net_device *dev = NULL;
 134         struct ipv6_mc_socklist *mc_lst;
 135         struct ipv6_pinfo *np = inet6_sk(sk);
 136         struct net *net = sock_net(sk);
 137         int err;
 138
 139         if (!ipv6_addr_is_multicast(addr))
 140                 return -EINVAL;
 141
 142         rcu_read_lock();
 143         for_each_pmc_rcu(np, mc_lst) {
 144                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 145                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 146                         rcu_read_unlock();
 147                         return -EADDRINUSE;
 148                 }
 149         }
 150         rcu_read_unlock();
 151
 152         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 153
 154         if (mc_lst == NULL)
 155                 return -ENOMEM;
 156
 157         mc_lst->next = NULL;
 158         mc_lst->addr = *addr;
 159
 160         rcu_read_lock();
 161         if (ifindex == 0) {
 162                 struct rt6_info *rt;
 163                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 164                 if (rt) {
 165                         dev = rt->dst.dev;
 166                         ip6_rt_put(rt);
 167                 }
 168         } else
 169                 dev = dev_get_by_index_rcu(net, ifindex);
 170
 171         if (dev == NULL) {
 172                 rcu_read_unlock();
 173                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 174                 return -ENODEV;
 175         }
 176
 177         mc_lst->ifindex = dev->ifindex;
 178         mc_lst->sfmode = MCAST_EXCLUDE;
 179         rwlock_init(&mc_lst->sflock);
 180         mc_lst->sflist = NULL;
 181
 182         /*
 183          *      now add/increase the group membership on the device
 184          */
 185
 186         err = ipv6_dev_mc_inc(dev, addr);
 187
 188         if (err) {
 189                 rcu_read_unlock();
 190                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 191                 return err;
 192         }
 193
 194         spin_lock(&ipv6_sk_mc_lock);
 195         mc_lst->next = np->ipv6_mc_list;
 196         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 197         spin_unlock(&ipv6_sk_mc_lock);
 198
 199         rcu_read_unlock();
 200
 201         return 0;
 202 }
 203
 204 /*
 205  *      socket leave on multicast group
 206  */
 207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 208 {
 209         struct ipv6_pinfo *np = inet6_sk(sk);
 210         struct ipv6_mc_socklist *mc_lst;
 211         struct ipv6_mc_socklist __rcu **lnk;
 212         struct net *net = sock_net(sk);
 213
 214         if (!ipv6_addr_is_multicast(addr))
 215                 return -EINVAL;
 216
 217         spin_lock(&ipv6_sk_mc_lock);
 218         for (lnk = &np->ipv6_mc_list;
 219              (mc_lst = rcu_dereference_protected(*lnk,
 220                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 221               lnk = &mc_lst->next) {
 222                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 223                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 224                         struct net_device *dev;
 225
 226                         *lnk = mc_lst->next;
 227                         spin_unlock(&ipv6_sk_mc_lock);
 228
 229                         rcu_read_lock();
 230                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 231                         if (dev != NULL) {
 232                                 struct inet6_dev *idev = __in6_dev_get(dev);
 233
 234                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 235                                 if (idev)
 236                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 237                         } else
 238                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 239                         rcu_read_unlock();
 240                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 241                         kfree_rcu(mc_lst, rcu);
 242                         return 0;
 243                 }
 244         }
 245         spin_unlock(&ipv6_sk_mc_lock);
 246
 247         return -EADDRNOTAVAIL;
 248 }
 249
 250 /* called with rcu_read_lock() */
 251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 252                                              const struct in6_addr *group,
 253                                              int ifindex)
 254 {
 255         struct net_device *dev = NULL;
 256         struct inet6_dev *idev = NULL;
 257
 258         if (ifindex == 0) {
 259                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 260
 261                 if (rt) {
 262                         dev = rt->dst.dev;
 263                         ip6_rt_put(rt);
 264                 }
 265         } else
 266                 dev = dev_get_by_index_rcu(net, ifindex);
 267
 268         if (!dev)
 269                 return NULL;
 270         idev = __in6_dev_get(dev);
 271         if (!idev)
 272                 return NULL;
 273         read_lock_bh(&idev->lock);
 274         if (idev->dead) {
 275                 read_unlock_bh(&idev->lock);
 276                 return NULL;
 277         }
 278         return idev;
 279 }
 280
 281 void ipv6_sock_mc_close(struct sock *sk)
 282 {
 283         struct ipv6_pinfo *np = inet6_sk(sk);
 284         struct ipv6_mc_socklist *mc_lst;
 285         struct net *net = sock_net(sk);
 286
 287         if (!rcu_access_pointer(np->ipv6_mc_list))
 288                 return;
 289
 290         spin_lock(&ipv6_sk_mc_lock);
 291         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 292                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 293                 struct net_device *dev;
 294
 295                 np->ipv6_mc_list = mc_lst->next;
 296                 spin_unlock(&ipv6_sk_mc_lock);
 297
 298                 rcu_read_lock();
 299                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 300                 if (dev) {
 301                         struct inet6_dev *idev = __in6_dev_get(dev);
 302
 303                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 304                         if (idev)
 305                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 306                 } else
 307                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 308                 rcu_read_unlock();
 309
 310                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 311                 kfree_rcu(mc_lst, rcu);
 312
 313                 spin_lock(&ipv6_sk_mc_lock);
 314         }
 315         spin_unlock(&ipv6_sk_mc_lock);
 316 }
 317
 318 int ip6_mc_source(int add, int omode, struct sock *sk,
 319         struct group_source_req *pgsr)
 320 {
 321         struct in6_addr *source, *group;
 322         struct ipv6_mc_socklist *pmc;
 323         struct inet6_dev *idev;
 324         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 325         struct ip6_sf_socklist *psl;
 326         struct net *net = sock_net(sk);
 327         int i, j, rv;
 328         int leavegroup = 0;
 329         int pmclocked = 0;
 330         int err;
 331
 332         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 333         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 334
 335         if (!ipv6_addr_is_multicast(group))
 336                 return -EINVAL;
 337
 338         rcu_read_lock();
 339         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 340         if (!idev) {
 341                 rcu_read_unlock();
 342                 return -ENODEV;
 343         }
 344
 345         err = -EADDRNOTAVAIL;
 346
 347         for_each_pmc_rcu(inet6, pmc) {
 348                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 349                         continue;
 350                 if (ipv6_addr_equal(&pmc->addr, group))
 351                         break;
 352         }
 353         if (!pmc) {             /* must have a prior join */
 354                 err = -EINVAL;
 355                 goto done;
 356         }
 357         /* if a source filter was set, must be the same mode as before */
 358         if (pmc->sflist) {
 359                 if (pmc->sfmode != omode) {
 360                         err = -EINVAL;
 361                         goto done;
 362                 }
 363         } else if (pmc->sfmode != omode) {
 364                 /* allow mode switches for empty-set filters */
 365                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 366                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 367                 pmc->sfmode = omode;
 368         }
 369
 370         write_lock(&pmc->sflock);
 371         pmclocked = 1;
 372
 373         psl = pmc->sflist;
 374         if (!add) {
 375                 if (!psl)
 376                         goto done;      /* err = -EADDRNOTAVAIL */
 377                 rv = !0;
 378                 for (i=0; i<psl->sl_count; i++) {
 379                         rv = memcmp(&psl->sl_addr[i], source,
 380                                 sizeof(struct in6_addr));
 381                         if (rv == 0)
 382                                 break;
 383                 }
 384                 if (rv)         /* source not found */
 385                         goto done;      /* err = -EADDRNOTAVAIL */
 386
 387                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 388                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 389                         leavegroup = 1;
 390                         goto done;
 391                 }
 392
 393                 /* update the interface filter */
 394                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 395
 396                 for (j=i+1; j<psl->sl_count; j++)
 397                         psl->sl_addr[j-1] = psl->sl_addr[j];
 398                 psl->sl_count--;
 399                 err = 0;
 400                 goto done;
 401         }
 402         /* else, add a new source to the filter */
 403
 404         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 405                 err = -ENOBUFS;
 406                 goto done;
 407         }
 408         if (!psl || psl->sl_count == psl->sl_max) {
 409                 struct ip6_sf_socklist *newpsl;
 410                 int count = IP6_SFBLOCK;
 411
 412                 if (psl)
 413                         count += psl->sl_max;
 414                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 415                 if (!newpsl) {
 416                         err = -ENOBUFS;
 417                         goto done;
 418                 }
 419                 newpsl->sl_max = count;
 420                 newpsl->sl_count = count - IP6_SFBLOCK;
 421                 if (psl) {
 422                         for (i=0; i<psl->sl_count; i++)
 423                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 424                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 425                 }
 426                 pmc->sflist = psl = newpsl;
 427         }
 428         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 429         for (i=0; i<psl->sl_count; i++) {
 430                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 431                 if (rv == 0)
 432                         break;
 433         }
 434         if (rv == 0)            /* address already there is an error */
 435                 goto done;
 436         for (j=psl->sl_count-1; j>=i; j--)
 437                 psl->sl_addr[j+1] = psl->sl_addr[j];
 438         psl->sl_addr[i] = *source;
 439         psl->sl_count++;
 440         err = 0;
 441         /* update the interface list */
 442         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 443 done:
 444         if (pmclocked)
 445                 write_unlock(&pmc->sflock);
 446         read_unlock_bh(&idev->lock);
 447         rcu_read_unlock();
 448         if (leavegroup)
 449                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 450         return err;
 451 }
 452
 453 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 454 {
 455         const struct in6_addr *group;
 456         struct ipv6_mc_socklist *pmc;
 457         struct inet6_dev *idev;
 458         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 459         struct ip6_sf_socklist *newpsl, *psl;
 460         struct net *net = sock_net(sk);
 461         int leavegroup = 0;
 462         int i, err;
 463
 464         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 465
 466         if (!ipv6_addr_is_multicast(group))
 467                 return -EINVAL;
 468         if (gsf->gf_fmode != MCAST_INCLUDE &&
 469             gsf->gf_fmode != MCAST_EXCLUDE)
 470                 return -EINVAL;
 471
 472         rcu_read_lock();
 473         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 474
 475         if (!idev) {
 476                 rcu_read_unlock();
 477                 return -ENODEV;
 478         }
 479
 480         err = 0;
 481
 482         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 483                 leavegroup = 1;
 484                 goto done;
 485         }
 486
 487         for_each_pmc_rcu(inet6, pmc) {
 488                 if (pmc->ifindex != gsf->gf_interface)
 489                         continue;
 490                 if (ipv6_addr_equal(&pmc->addr, group))
 491                         break;
 492         }
 493         if (!pmc) {             /* must have a prior join */
 494                 err = -EINVAL;
 495                 goto done;
 496         }
 497         if (gsf->gf_numsrc) {
 498                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 499                                                           GFP_ATOMIC);
 500                 if (!newpsl) {
 501                         err = -ENOBUFS;
 502                         goto done;
 503                 }
 504                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 505                 for (i=0; i<newpsl->sl_count; ++i) {
 506                         struct sockaddr_in6 *psin6;
 507
 508                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 509                         newpsl->sl_addr[i] = psin6->sin6_addr;
 510                 }
 511                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 512                         newpsl->sl_count, newpsl->sl_addr, 0);
 513                 if (err) {
 514                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 515                         goto done;
 516                 }
 517         } else {
 518                 newpsl = NULL;
 519                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 520         }
 521
 522         write_lock(&pmc->sflock);
 523         psl = pmc->sflist;
 524         if (psl) {
 525                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 526                         psl->sl_count, psl->sl_addr, 0);
 527                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 528         } else
 529                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 530         pmc->sflist = newpsl;
 531         pmc->sfmode = gsf->gf_fmode;
 532         write_unlock(&pmc->sflock);
 533         err = 0;
 534 done:
 535         read_unlock_bh(&idev->lock);
 536         rcu_read_unlock();
 537         if (leavegroup)
 538                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 539         return err;
 540 }
 541
 542 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 543         struct group_filter __user *optval, int __user *optlen)
 544 {
 545         int err, i, count, copycount;
 546         const struct in6_addr *group;
 547         struct ipv6_mc_socklist *pmc;
 548         struct inet6_dev *idev;
 549         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 550         struct ip6_sf_socklist *psl;
 551         struct net *net = sock_net(sk);
 552
 553         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 554
 555         if (!ipv6_addr_is_multicast(group))
 556                 return -EINVAL;
 557
 558         rcu_read_lock();
 559         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 560
 561         if (!idev) {
 562                 rcu_read_unlock();
 563                 return -ENODEV;
 564         }
 565
 566         err = -EADDRNOTAVAIL;
 567         /*
 568          * changes to the ipv6_mc_list require the socket lock and
 569          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 570          * so reading the list is safe.
 571          */
 572
 573         for_each_pmc_rcu(inet6, pmc) {
 574                 if (pmc->ifindex != gsf->gf_interface)
 575                         continue;
 576                 if (ipv6_addr_equal(group, &pmc->addr))
 577                         break;
 578         }
 579         if (!pmc)               /* must have a prior join */
 580                 goto done;
 581         gsf->gf_fmode = pmc->sfmode;
 582         psl = pmc->sflist;
 583         count = psl ? psl->sl_count : 0;
 584         read_unlock_bh(&idev->lock);
 585         rcu_read_unlock();
 586
 587         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 588         gsf->gf_numsrc = count;
 589         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 590             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 591                 return -EFAULT;
 592         }
 593         /* changes to psl require the socket lock, a read lock on
 594          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 595          * have the socket lock, so reading here is safe.
 596          */
 597         for (i=0; i<copycount; i++) {
 598                 struct sockaddr_in6 *psin6;
 599                 struct sockaddr_storage ss;
 600
 601                 psin6 = (struct sockaddr_in6 *)&ss;
 602                 memset(&ss, 0, sizeof(ss));
 603                 psin6->sin6_family = AF_INET6;
 604                 psin6->sin6_addr = psl->sl_addr[i];
 605                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 606                         return -EFAULT;
 607         }
 608         return 0;
 609 done:
 610         read_unlock_bh(&idev->lock);
 611         rcu_read_unlock();
 612         return err;
 613 }
 614
 615 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 616                     const struct in6_addr *src_addr)
 617 {
 618         struct ipv6_pinfo *np = inet6_sk(sk);
 619         struct ipv6_mc_socklist *mc;
 620         struct ip6_sf_socklist *psl;
 621         bool rv = true;
 622
 623         rcu_read_lock();
 624         for_each_pmc_rcu(np, mc) {
 625                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 626                         break;
 627         }
 628         if (!mc) {
 629                 rcu_read_unlock();
 630                 return true;
 631         }
 632         read_lock(&mc->sflock);
 633         psl = mc->sflist;
 634         if (!psl) {
 635                 rv = mc->sfmode == MCAST_EXCLUDE;
 636         } else {
 637                 int i;
 638
 639                 for (i=0; i<psl->sl_count; i++) {
 640                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 641                                 break;
 642                 }
 643                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 644                         rv = false;
 645                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 646                         rv = false;
 647         }
 648         read_unlock(&mc->sflock);
 649         rcu_read_unlock();
 650
 651         return rv;
 652 }
 653
 654 static void ma_put(struct ifmcaddr6 *mc)
 655 {
 656         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 657                 in6_dev_put(mc->idev);
 658                 kfree(mc);
 659         }
 660 }
 661
 662 static void igmp6_group_added(struct ifmcaddr6 *mc)
 663 {
 664         struct net_device *dev = mc->idev->dev;
 665         char buf[MAX_ADDR_LEN];
 666
 667         spin_lock_bh(&mc->mca_lock);
 668         if (!(mc->mca_flags&MAF_LOADED)) {
 669                 mc->mca_flags |= MAF_LOADED;
 670                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 671                         dev_mc_add(dev, buf);
 672         }
 673         spin_unlock_bh(&mc->mca_lock);
 674
 675         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 676                 return;
 677
 678         if (MLD_V1_SEEN(mc->idev)) {
 679                 igmp6_join_group(mc);
 680                 return;
 681         }
 682         /* else v2 */
 683
 684         mc->mca_crcount = mc->idev->mc_qrv;
 685         mld_ifc_event(mc->idev);
 686 }
 687
 688 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 689 {
 690         struct net_device *dev = mc->idev->dev;
 691         char buf[MAX_ADDR_LEN];
 692
 693         spin_lock_bh(&mc->mca_lock);
 694         if (mc->mca_flags&MAF_LOADED) {
 695                 mc->mca_flags &= ~MAF_LOADED;
 696                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 697                         dev_mc_del(dev, buf);
 698         }
 699
 700         if (mc->mca_flags & MAF_NOREPORT)
 701                 goto done;
 702         spin_unlock_bh(&mc->mca_lock);
 703
 704         if (!mc->idev->dead)
 705                 igmp6_leave_group(mc);
 706
 707         spin_lock_bh(&mc->mca_lock);
 708         if (del_timer(&mc->mca_timer))
 709                 atomic_dec(&mc->mca_refcnt);
 710 done:
 711         ip6_mc_clear_src(mc);
 712         spin_unlock_bh(&mc->mca_lock);
 713 }
 714
 715 /*
 716  * deleted ifmcaddr6 manipulation
 717  */
 718 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 719 {
 720         struct ifmcaddr6 *pmc;
 721
 722         /* this is an "ifmcaddr6" for convenience; only the fields below
 723          * are actually used. In particular, the refcnt and users are not
 724          * used for management of the delete list. Using the same structure
 725          * for deleted items allows change reports to use common code with
 726          * non-deleted or query-response MCA's.
 727          */
 728         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 729         if (!pmc)
 730                 return;
 731
 732         spin_lock_bh(&im->mca_lock);
 733         spin_lock_init(&pmc->mca_lock);
 734         pmc->idev = im->idev;
 735         in6_dev_hold(idev);
 736         pmc->mca_addr = im->mca_addr;
 737         pmc->mca_crcount = idev->mc_qrv;
 738         pmc->mca_sfmode = im->mca_sfmode;
 739         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 740                 struct ip6_sf_list *psf;
 741
 742                 pmc->mca_tomb = im->mca_tomb;
 743                 pmc->mca_sources = im->mca_sources;
 744                 im->mca_tomb = im->mca_sources = NULL;
 745                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 746                         psf->sf_crcount = pmc->mca_crcount;
 747         }
 748         spin_unlock_bh(&im->mca_lock);
 749
 750         spin_lock_bh(&idev->mc_lock);
 751         pmc->next = idev->mc_tomb;
 752         idev->mc_tomb = pmc;
 753         spin_unlock_bh(&idev->mc_lock);
 754 }
 755
 756 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 757 {
 758         struct ifmcaddr6 *pmc, *pmc_prev;
 759         struct ip6_sf_list *psf, *psf_next;
 760
 761         spin_lock_bh(&idev->mc_lock);
 762         pmc_prev = NULL;
 763         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 764                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 765                         break;
 766                 pmc_prev = pmc;
 767         }
 768         if (pmc) {
 769                 if (pmc_prev)
 770                         pmc_prev->next = pmc->next;
 771                 else
 772                         idev->mc_tomb = pmc->next;
 773         }
 774         spin_unlock_bh(&idev->mc_lock);
 775
 776         if (pmc) {
 777                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 778                         psf_next = psf->sf_next;
 779                         kfree(psf);
 780                 }
 781                 in6_dev_put(pmc->idev);
 782                 kfree(pmc);
 783         }
 784 }
 785
 786 static void mld_clear_delrec(struct inet6_dev *idev)
 787 {
 788         struct ifmcaddr6 *pmc, *nextpmc;
 789
 790         spin_lock_bh(&idev->mc_lock);
 791         pmc = idev->mc_tomb;
 792         idev->mc_tomb = NULL;
 793         spin_unlock_bh(&idev->mc_lock);
 794
 795         for (; pmc; pmc = nextpmc) {
 796                 nextpmc = pmc->next;
 797                 ip6_mc_clear_src(pmc);
 798                 in6_dev_put(pmc->idev);
 799                 kfree(pmc);
 800         }
 801
 802         /* clear dead sources, too */
 803         read_lock_bh(&idev->lock);
 804         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 805                 struct ip6_sf_list *psf, *psf_next;
 806
 807                 spin_lock_bh(&pmc->mca_lock);
 808                 psf = pmc->mca_tomb;
 809                 pmc->mca_tomb = NULL;
 810                 spin_unlock_bh(&pmc->mca_lock);
 811                 for (; psf; psf=psf_next) {
 812                         psf_next = psf->sf_next;
 813                         kfree(psf);
 814                 }
 815         }
 816         read_unlock_bh(&idev->lock);
 817 }
 818
 819
 820 /*
 821  *      device multicast group inc (add if not found)
 822  */
 823 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 824 {
 825         struct ifmcaddr6 *mc;
 826         struct inet6_dev *idev;
 827
 828         /* we need to take a reference on idev */
 829         idev = in6_dev_get(dev);
 830
 831         if (idev == NULL)
 832                 return -EINVAL;
 833
 834         write_lock_bh(&idev->lock);
 835         if (idev->dead) {
 836                 write_unlock_bh(&idev->lock);
 837                 in6_dev_put(idev);
 838                 return -ENODEV;
 839         }
 840
 841         for (mc = idev->mc_list; mc; mc = mc->next) {
 842                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 843                         mc->mca_users++;
 844                         write_unlock_bh(&idev->lock);
 845                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 846                                 NULL, 0);
 847                         in6_dev_put(idev);
 848                         return 0;
 849                 }
 850         }
 851
 852         /*
 853          *      not found: create a new one.
 854          */
 855
 856         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 857
 858         if (mc == NULL) {
 859                 write_unlock_bh(&idev->lock);
 860                 in6_dev_put(idev);
 861                 return -ENOMEM;
 862         }
 863
 864         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 865
 866         mc->mca_addr = *addr;
 867         mc->idev = idev; /* (reference taken) */
 868         mc->mca_users = 1;
 869         /* mca_stamp should be updated upon changes */
 870         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 871         atomic_set(&mc->mca_refcnt, 2);
 872         spin_lock_init(&mc->mca_lock);
 873
 874         /* initial mode is (EX, empty) */
 875         mc->mca_sfmode = MCAST_EXCLUDE;
 876         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 877
 878         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 879             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 880                 mc->mca_flags |= MAF_NOREPORT;
 881
 882         mc->next = idev->mc_list;
 883         idev->mc_list = mc;
 884         write_unlock_bh(&idev->lock);
 885
 886         mld_del_delrec(idev, &mc->mca_addr);
 887         igmp6_group_added(mc);
 888         ma_put(mc);
 889         return 0;
 890 }
 891
 892 /*
 893  *      device multicast group del
 894  */
 895 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 896 {
 897         struct ifmcaddr6 *ma, **map;
 898
 899         write_lock_bh(&idev->lock);
 900         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 901                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 902                         if (--ma->mca_users == 0) {
 903                                 *map = ma->next;
 904                                 write_unlock_bh(&idev->lock);
 905
 906                                 igmp6_group_dropped(ma);
 907
 908                                 ma_put(ma);
 909                                 return 0;
 910                         }
 911                         write_unlock_bh(&idev->lock);
 912                         return 0;
 913                 }
 914         }
 915         write_unlock_bh(&idev->lock);
 916
 917         return -ENOENT;
 918 }
 919
 920 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 921 {
 922         struct inet6_dev *idev;
 923         int err;
 924
 925         rcu_read_lock();
 926
 927         idev = __in6_dev_get(dev);
 928         if (!idev)
 929                 err = -ENODEV;
 930         else
 931                 err = __ipv6_dev_mc_dec(idev, addr);
 932
 933         rcu_read_unlock();
 934         return err;
 935 }
 936
 937 /*
 938  * identify MLD packets for MLD filter exceptions
 939  */
 940 bool ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 941 {
 942         struct icmp6hdr *pic;
 943
 944         if (nexthdr != IPPROTO_ICMPV6)
 945                 return false;
 946
 947         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 948                 return false;
 949
 950         pic = icmp6_hdr(skb);
 951
 952         switch (pic->icmp6_type) {
 953         case ICMPV6_MGM_QUERY:
 954         case ICMPV6_MGM_REPORT:
 955         case ICMPV6_MGM_REDUCTION:
 956         case ICMPV6_MLD2_REPORT:
 957                 return true;
 958         default:
 959                 break;
 960         }
 961         return false;
 962 }
 963
 964 /*
 965  *      check if the interface/address pair is valid
 966  */
 967 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 968                          const struct in6_addr *src_addr)
 969 {
 970         struct inet6_dev *idev;
 971         struct ifmcaddr6 *mc;
 972         bool rv = false;
 973
 974         rcu_read_lock();
 975         idev = __in6_dev_get(dev);
 976         if (idev) {
 977                 read_lock_bh(&idev->lock);
 978                 for (mc = idev->mc_list; mc; mc=mc->next) {
 979                         if (ipv6_addr_equal(&mc->mca_addr, group))
 980                                 break;
 981                 }
 982                 if (mc) {
 983                         if (src_addr && !ipv6_addr_any(src_addr)) {
 984                                 struct ip6_sf_list *psf;
 985
 986                                 spin_lock_bh(&mc->mca_lock);
 987                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 988                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 989                                                 break;
 990                                 }
 991                                 if (psf)
 992                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 993                                                 psf->sf_count[MCAST_EXCLUDE] !=
 994                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 995                                 else
 996                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 997                                 spin_unlock_bh(&mc->mca_lock);
 998                         } else
 999                                 rv = true; /* don't filter unspecified source */
1000                 }
1001                 read_unlock_bh(&idev->lock);
1002         }
1003         rcu_read_unlock();
1004         return rv;
1005 }
1006
1007 static void mld_gq_start_timer(struct inet6_dev *idev)
1008 {
1009         int tv = net_random() % idev->mc_maxdelay;
1010
1011         idev->mc_gq_running = 1;
1012         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1013                 in6_dev_hold(idev);
1014 }
1015
1016 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1017 {
1018         int tv = net_random() % delay;
1019
1020         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1021                 in6_dev_hold(idev);
1022 }
1023
1024 /*
1025  *      IGMP handling (alias multicast ICMPv6 messages)
1026  */
1027
1028 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1029 {
1030         unsigned long delay = resptime;
1031
1032         /* Do not start timer for these addresses */
1033         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1034             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1035                 return;
1036
1037         if (del_timer(&ma->mca_timer)) {
1038                 atomic_dec(&ma->mca_refcnt);
1039                 delay = ma->mca_timer.expires - jiffies;
1040         }
1041
1042         if (delay >= resptime) {
1043                 if (resptime)
1044                         delay = net_random() % resptime;
1045                 else
1046                         delay = 1;
1047         }
1048         ma->mca_timer.expires = jiffies + delay;
1049         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1050                 atomic_inc(&ma->mca_refcnt);
1051         ma->mca_flags |= MAF_TIMER_RUNNING;
1052 }
1053
1054 /* mark EXCLUDE-mode sources */
1055 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1056                              const struct in6_addr *srcs)
1057 {
1058         struct ip6_sf_list *psf;
1059         int i, scount;
1060
1061         scount = 0;
1062         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1063                 if (scount == nsrcs)
1064                         break;
1065                 for (i=0; i<nsrcs; i++) {
1066                         /* skip inactive filters */
1067                         if (psf->sf_count[MCAST_INCLUDE] ||
1068                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1069                             psf->sf_count[MCAST_EXCLUDE])
1070                                 break;
1071                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1072                                 scount++;
1073                                 break;
1074                         }
1075                 }
1076         }
1077         pmc->mca_flags &= ~MAF_GSQUERY;
1078         if (scount == nsrcs)    /* all sources excluded */
1079                 return false;
1080         return true;
1081 }
1082
1083 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1084                             const struct in6_addr *srcs)
1085 {
1086         struct ip6_sf_list *psf;
1087         int i, scount;
1088
1089         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1090                 return mld_xmarksources(pmc, nsrcs, srcs);
1091
1092         /* mark INCLUDE-mode sources */
1093
1094         scount = 0;
1095         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1096                 if (scount == nsrcs)
1097                         break;
1098                 for (i=0; i<nsrcs; i++) {
1099                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1100                                 psf->sf_gsresp = 1;
1101                                 scount++;
1102                                 break;
1103                         }
1104                 }
1105         }
1106         if (!scount) {
1107                 pmc->mca_flags &= ~MAF_GSQUERY;
1108                 return false;
1109         }
1110         pmc->mca_flags |= MAF_GSQUERY;
1111         return true;
1112 }
1113
1114 /* called with rcu_read_lock() */
1115 int igmp6_event_query(struct sk_buff *skb)
1116 {
1117         struct mld2_query *mlh2 = NULL;
1118         struct ifmcaddr6 *ma;
1119         const struct in6_addr *group;
1120         unsigned long max_delay;
1121         struct inet6_dev *idev;
1122         struct mld_msg *mld;
1123         int group_type;
1124         int mark = 0;
1125         int len;
1126
1127         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1128                 return -EINVAL;
1129
1130         /* compute payload length excluding extension headers */
1131         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1132         len -= skb_network_header_len(skb);
1133
1134         /* Drop queries with not link local source */
1135         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1136                 return -EINVAL;
1137
1138         idev = __in6_dev_get(skb->dev);
1139
1140         if (idev == NULL)
1141                 return 0;
1142
1143         mld = (struct mld_msg *)icmp6_hdr(skb);
1144         group = &mld->mld_mca;
1145         group_type = ipv6_addr_type(group);
1146
1147         if (group_type != IPV6_ADDR_ANY &&
1148             !(group_type&IPV6_ADDR_MULTICAST))
1149                 return -EINVAL;
1150
1151         if (len == 24) {
1152                 int switchback;
1153                 /* MLDv1 router present */
1154
1155                 /* Translate milliseconds to jiffies */
1156                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1157
1158                 switchback = (idev->mc_qrv + 1) * max_delay;
1159                 idev->mc_v1_seen = jiffies + switchback;
1160
1161                 /* cancel the interface change timer */
1162                 idev->mc_ifc_count = 0;
1163                 if (del_timer(&idev->mc_ifc_timer))
1164                         __in6_dev_put(idev);
1165                 /* clear deleted report items */
1166                 mld_clear_delrec(idev);
1167         } else if (len >= 28) {
1168                 int srcs_offset = sizeof(struct mld2_query) -
1169                                   sizeof(struct icmp6hdr);
1170                 if (!pskb_may_pull(skb, srcs_offset))
1171                         return -EINVAL;
1172
1173                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1174                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1175                 if (!max_delay)
1176                         max_delay = 1;
1177                 idev->mc_maxdelay = max_delay;
1178                 if (mlh2->mld2q_qrv)
1179                         idev->mc_qrv = mlh2->mld2q_qrv;
1180                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1181                         if (mlh2->mld2q_nsrcs)
1182                                 return -EINVAL; /* no sources allowed */
1183
1184                         mld_gq_start_timer(idev);
1185                         return 0;
1186                 }
1187                 /* mark sources to include, if group & source-specific */
1188                 if (mlh2->mld2q_nsrcs != 0) {
1189                         if (!pskb_may_pull(skb, srcs_offset +
1190                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1191                                 return -EINVAL;
1192
1193                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1194                         mark = 1;
1195                 }
1196         } else
1197                 return -EINVAL;
1198
1199         read_lock_bh(&idev->lock);
1200         if (group_type == IPV6_ADDR_ANY) {
1201                 for (ma = idev->mc_list; ma; ma=ma->next) {
1202                         spin_lock_bh(&ma->mca_lock);
1203                         igmp6_group_queried(ma, max_delay);
1204                         spin_unlock_bh(&ma->mca_lock);
1205                 }
1206         } else {
1207                 for (ma = idev->mc_list; ma; ma=ma->next) {
1208                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1209                                 continue;
1210                         spin_lock_bh(&ma->mca_lock);
1211                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1212                                 /* gsquery <- gsquery && mark */
1213                                 if (!mark)
1214                                         ma->mca_flags &= ~MAF_GSQUERY;
1215                         } else {
1216                                 /* gsquery <- mark */
1217                                 if (mark)
1218                                         ma->mca_flags |= MAF_GSQUERY;
1219                                 else
1220                                         ma->mca_flags &= ~MAF_GSQUERY;
1221                         }
1222                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1223                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1224                                 igmp6_group_queried(ma, max_delay);
1225                         spin_unlock_bh(&ma->mca_lock);
1226                         break;
1227                 }
1228         }
1229         read_unlock_bh(&idev->lock);
1230
1231         return 0;
1232 }
1233
1234 /* called with rcu_read_lock() */
1235 int igmp6_event_report(struct sk_buff *skb)
1236 {
1237         struct ifmcaddr6 *ma;
1238         struct inet6_dev *idev;
1239         struct mld_msg *mld;
1240         int addr_type;
1241
1242         /* Our own report looped back. Ignore it. */
1243         if (skb->pkt_type == PACKET_LOOPBACK)
1244                 return 0;
1245
1246         /* send our report if the MC router may not have heard this report */
1247         if (skb->pkt_type != PACKET_MULTICAST &&
1248             skb->pkt_type != PACKET_BROADCAST)
1249                 return 0;
1250
1251         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1252                 return -EINVAL;
1253
1254         mld = (struct mld_msg *)icmp6_hdr(skb);
1255
1256         /* Drop reports with not link local source */
1257         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1258         if (addr_type != IPV6_ADDR_ANY &&
1259             !(addr_type&IPV6_ADDR_LINKLOCAL))
1260                 return -EINVAL;
1261
1262         idev = __in6_dev_get(skb->dev);
1263         if (idev == NULL)
1264                 return -ENODEV;
1265
1266         /*
1267          *      Cancel the timer for this group
1268          */
1269
1270         read_lock_bh(&idev->lock);
1271         for (ma = idev->mc_list; ma; ma=ma->next) {
1272                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1273                         spin_lock(&ma->mca_lock);
1274                         if (del_timer(&ma->mca_timer))
1275                                 atomic_dec(&ma->mca_refcnt);
1276                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1277                         spin_unlock(&ma->mca_lock);
1278                         break;
1279                 }
1280         }
1281         read_unlock_bh(&idev->lock);
1282         return 0;
1283 }
1284
1285 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1286                   int gdeleted, int sdeleted)
1287 {
1288         switch (type) {
1289         case MLD2_MODE_IS_INCLUDE:
1290         case MLD2_MODE_IS_EXCLUDE:
1291                 if (gdeleted || sdeleted)
1292                         return false;
1293                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1294                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1295                                 return true;
1296                         /* don't include if this source is excluded
1297                          * in all filters
1298                          */
1299                         if (psf->sf_count[MCAST_INCLUDE])
1300                                 return type == MLD2_MODE_IS_INCLUDE;
1301                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1302                                 psf->sf_count[MCAST_EXCLUDE];
1303                 }
1304                 return false;
1305         case MLD2_CHANGE_TO_INCLUDE:
1306                 if (gdeleted || sdeleted)
1307                         return false;
1308                 return psf->sf_count[MCAST_INCLUDE] != 0;
1309         case MLD2_CHANGE_TO_EXCLUDE:
1310                 if (gdeleted || sdeleted)
1311                         return false;
1312                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1313                     psf->sf_count[MCAST_INCLUDE])
1314                         return false;
1315                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1316                         psf->sf_count[MCAST_EXCLUDE];
1317         case MLD2_ALLOW_NEW_SOURCES:
1318                 if (gdeleted || !psf->sf_crcount)
1319                         return false;
1320                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1321         case MLD2_BLOCK_OLD_SOURCES:
1322                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1323                         return gdeleted || (psf->sf_crcount && sdeleted);
1324                 return psf->sf_crcount && !gdeleted && !sdeleted;
1325         }
1326         return false;
1327 }
1328
1329 static int
1330 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1331 {
1332         struct ip6_sf_list *psf;
1333         int scount = 0;
1334
1335         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1336                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1337                         continue;
1338                 scount++;
1339         }
1340         return scount;
1341 }
1342
1343 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1344 {
1345         struct net *net = dev_net(dev);
1346         struct sock *sk = net->ipv6.igmp_sk;
1347         struct sk_buff *skb;
1348         struct mld2_report *pmr;
1349         struct in6_addr addr_buf;
1350         const struct in6_addr *saddr;
1351         int hlen = LL_RESERVED_SPACE(dev);
1352         int tlen = dev->needed_tailroom;
1353         int err;
1354         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1355                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1356                      IPV6_TLV_PADN, 0 };
1357
1358         /* we assume size > sizeof(ra) here */
1359         size += hlen + tlen;
1360         /* limit our allocations to order-0 page */
1361         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1362         skb = sock_alloc_send_skb(sk, size, 1, &err);
1363
1364         if (!skb)
1365                 return NULL;
1366
1367         skb_reserve(skb, hlen);
1368
1369         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1370                 /* <draft-ietf-magma-mld-source-05.txt>:
1371                  * use unspecified address as the source address
1372                  * when a valid link-local address is not available.
1373                  */
1374                 saddr = &in6addr_any;
1375         } else
1376                 saddr = &addr_buf;
1377
1378         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1379
1380         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1381
1382         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1383         skb_put(skb, sizeof(*pmr));
1384         pmr = (struct mld2_report *)skb_transport_header(skb);
1385         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1386         pmr->mld2r_resv1 = 0;
1387         pmr->mld2r_cksum = 0;
1388         pmr->mld2r_resv2 = 0;
1389         pmr->mld2r_ngrec = 0;
1390         return skb;
1391 }
1392
1393 static void mld_sendpack(struct sk_buff *skb)
1394 {
1395         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1396         struct mld2_report *pmr =
1397                               (struct mld2_report *)skb_transport_header(skb);
1398         int payload_len, mldlen;
1399         struct inet6_dev *idev;
1400         struct net *net = dev_net(skb->dev);
1401         int err;
1402         struct flowi6 fl6;
1403         struct dst_entry *dst;
1404
1405         rcu_read_lock();
1406         idev = __in6_dev_get(skb->dev);
1407         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1408
1409         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1410         mldlen = skb->tail - skb->transport_header;
1411         pip6->payload_len = htons(payload_len);
1412
1413         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1414                                            IPPROTO_ICMPV6,
1415                                            csum_partial(skb_transport_header(skb),
1416                                                         mldlen, 0));
1417
1418         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1419                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1420                          skb->dev->ifindex);
1421         dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1422
1423         err = 0;
1424         if (IS_ERR(dst)) {
1425                 err = PTR_ERR(dst);
1426                 dst = NULL;
1427         }
1428         skb_dst_set(skb, dst);
1429         if (err)
1430                 goto err_out;
1431
1432         payload_len = skb->len;
1433
1434         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1435                       dst_output);
1436 out:
1437         if (!err) {
1438                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1439                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1440                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1441         } else
1442                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1443
1444         rcu_read_unlock();
1445         return;
1446
1447 err_out:
1448         kfree_skb(skb);
1449         goto out;
1450 }
1451
1452 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1453 {
1454         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1455 }
1456
1457 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1458         int type, struct mld2_grec **ppgr)
1459 {
1460         struct net_device *dev = pmc->idev->dev;
1461         struct mld2_report *pmr;
1462         struct mld2_grec *pgr;
1463
1464         if (!skb)
1465                 skb = mld_newpack(dev, dev->mtu);
1466         if (!skb)
1467                 return NULL;
1468         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1469         pgr->grec_type = type;
1470         pgr->grec_auxwords = 0;
1471         pgr->grec_nsrcs = 0;
1472         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1473         pmr = (struct mld2_report *)skb_transport_header(skb);
1474         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1475         *ppgr = pgr;
1476         return skb;
1477 }
1478
1479 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1480         skb_tailroom(skb)) : 0)
1481
1482 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1483         int type, int gdeleted, int sdeleted)
1484 {
1485         struct net_device *dev = pmc->idev->dev;
1486         struct mld2_report *pmr;
1487         struct mld2_grec *pgr = NULL;
1488         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1489         int scount, stotal, first, isquery, truncate;
1490
1491         if (pmc->mca_flags & MAF_NOREPORT)
1492                 return skb;
1493
1494         isquery = type == MLD2_MODE_IS_INCLUDE ||
1495                   type == MLD2_MODE_IS_EXCLUDE;
1496         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1497                     type == MLD2_CHANGE_TO_EXCLUDE;
1498
1499         stotal = scount = 0;
1500
1501         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1502
1503         if (!*psf_list)
1504                 goto empty_source;
1505
1506         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1507
1508         /* EX and TO_EX get a fresh packet, if needed */
1509         if (truncate) {
1510                 if (pmr && pmr->mld2r_ngrec &&
1511                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1512                         if (skb)
1513                                 mld_sendpack(skb);
1514                         skb = mld_newpack(dev, dev->mtu);
1515                 }
1516         }
1517         first = 1;
1518         psf_prev = NULL;
1519         for (psf=*psf_list; psf; psf=psf_next) {
1520                 struct in6_addr *psrc;
1521
1522                 psf_next = psf->sf_next;
1523
1524                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1525                         psf_prev = psf;
1526                         continue;
1527                 }
1528
1529                 /* clear marks on query responses */
1530                 if (isquery)
1531                         psf->sf_gsresp = 0;
1532
1533                 if (AVAILABLE(skb) < sizeof(*psrc) +
1534                     first*sizeof(struct mld2_grec)) {
1535                         if (truncate && !first)
1536                                 break;   /* truncate these */
1537                         if (pgr)
1538                                 pgr->grec_nsrcs = htons(scount);
1539                         if (skb)
1540                                 mld_sendpack(skb);
1541                         skb = mld_newpack(dev, dev->mtu);
1542                         first = 1;
1543                         scount = 0;
1544                 }
1545                 if (first) {
1546                         skb = add_grhead(skb, pmc, type, &pgr);
1547                         first = 0;
1548                 }
1549                 if (!skb)
1550                         return NULL;
1551                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1552                 *psrc = psf->sf_addr;
1553                 scount++; stotal++;
1554                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1555                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1556                         psf->sf_crcount--;
1557                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1558                                 if (psf_prev)
1559                                         psf_prev->sf_next = psf->sf_next;
1560                                 else
1561                                         *psf_list = psf->sf_next;
1562                                 kfree(psf);
1563                                 continue;
1564                         }
1565                 }
1566                 psf_prev = psf;
1567         }
1568
1569 empty_source:
1570         if (!stotal) {
1571                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1572                     type == MLD2_BLOCK_OLD_SOURCES)
1573                         return skb;
1574                 if (pmc->mca_crcount || isquery) {
1575                         /* make sure we have room for group header */
1576                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1577                                 mld_sendpack(skb);
1578                                 skb = NULL; /* add_grhead will get a new one */
1579                         }
1580                         skb = add_grhead(skb, pmc, type, &pgr);
1581                 }
1582         }
1583         if (pgr)
1584                 pgr->grec_nsrcs = htons(scount);
1585
1586         if (isquery)
1587                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1588         return skb;
1589 }
1590
1591 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1592 {
1593         struct sk_buff *skb = NULL;
1594         int type;
1595
1596         if (!pmc) {
1597                 read_lock_bh(&idev->lock);
1598                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1599                         if (pmc->mca_flags & MAF_NOREPORT)
1600                                 continue;
1601                         spin_lock_bh(&pmc->mca_lock);
1602                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1603                                 type = MLD2_MODE_IS_EXCLUDE;
1604                         else
1605                                 type = MLD2_MODE_IS_INCLUDE;
1606                         skb = add_grec(skb, pmc, type, 0, 0);
1607                         spin_unlock_bh(&pmc->mca_lock);
1608                 }
1609                 read_unlock_bh(&idev->lock);
1610         } else {
1611                 spin_lock_bh(&pmc->mca_lock);
1612                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1613                         type = MLD2_MODE_IS_EXCLUDE;
1614                 else
1615                         type = MLD2_MODE_IS_INCLUDE;
1616                 skb = add_grec(skb, pmc, type, 0, 0);
1617                 spin_unlock_bh(&pmc->mca_lock);
1618         }
1619         if (skb)
1620                 mld_sendpack(skb);
1621 }
1622
1623 /*
1624  * remove zero-count source records from a source filter list
1625  */
1626 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1627 {
1628         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1629
1630         psf_prev = NULL;
1631         for (psf=*ppsf; psf; psf = psf_next) {
1632                 psf_next = psf->sf_next;
1633                 if (psf->sf_crcount == 0) {
1634                         if (psf_prev)
1635                                 psf_prev->sf_next = psf->sf_next;
1636                         else
1637                                 *ppsf = psf->sf_next;
1638                         kfree(psf);
1639                 } else
1640                         psf_prev = psf;
1641         }
1642 }
1643
1644 static void mld_send_cr(struct inet6_dev *idev)
1645 {
1646         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1647         struct sk_buff *skb = NULL;
1648         int type, dtype;
1649
1650         read_lock_bh(&idev->lock);
1651         spin_lock(&idev->mc_lock);
1652
1653         /* deleted MCA's */
1654         pmc_prev = NULL;
1655         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1656                 pmc_next = pmc->next;
1657                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1658                         type = MLD2_BLOCK_OLD_SOURCES;
1659                         dtype = MLD2_BLOCK_OLD_SOURCES;
1660                         skb = add_grec(skb, pmc, type, 1, 0);
1661                         skb = add_grec(skb, pmc, dtype, 1, 1);
1662                 }
1663                 if (pmc->mca_crcount) {
1664                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1665                                 type = MLD2_CHANGE_TO_INCLUDE;
1666                                 skb = add_grec(skb, pmc, type, 1, 0);
1667                         }
1668                         pmc->mca_crcount--;
1669                         if (pmc->mca_crcount == 0) {
1670                                 mld_clear_zeros(&pmc->mca_tomb);
1671                                 mld_clear_zeros(&pmc->mca_sources);
1672                         }
1673                 }
1674                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1675                     !pmc->mca_sources) {
1676                         if (pmc_prev)
1677                                 pmc_prev->next = pmc_next;
1678                         else
1679                                 idev->mc_tomb = pmc_next;
1680                         in6_dev_put(pmc->idev);
1681                         kfree(pmc);
1682                 } else
1683                         pmc_prev = pmc;
1684         }
1685         spin_unlock(&idev->mc_lock);
1686
1687         /* change recs */
1688         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1689                 spin_lock_bh(&pmc->mca_lock);
1690                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1691                         type = MLD2_BLOCK_OLD_SOURCES;
1692                         dtype = MLD2_ALLOW_NEW_SOURCES;
1693                 } else {
1694                         type = MLD2_ALLOW_NEW_SOURCES;
1695                         dtype = MLD2_BLOCK_OLD_SOURCES;
1696                 }
1697                 skb = add_grec(skb, pmc, type, 0, 0);
1698                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1699
1700                 /* filter mode changes */
1701                 if (pmc->mca_crcount) {
1702                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1703                                 type = MLD2_CHANGE_TO_EXCLUDE;
1704                         else
1705                                 type = MLD2_CHANGE_TO_INCLUDE;
1706                         skb = add_grec(skb, pmc, type, 0, 0);
1707                         pmc->mca_crcount--;
1708                 }
1709                 spin_unlock_bh(&pmc->mca_lock);
1710         }
1711         read_unlock_bh(&idev->lock);
1712         if (!skb)
1713                 return;
1714         (void) mld_sendpack(skb);
1715 }
1716
1717 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1718 {
1719         struct net *net = dev_net(dev);
1720         struct sock *sk = net->ipv6.igmp_sk;
1721         struct inet6_dev *idev;
1722         struct sk_buff *skb;
1723         struct mld_msg *hdr;
1724         const struct in6_addr *snd_addr, *saddr;
1725         struct in6_addr addr_buf;
1726         int hlen = LL_RESERVED_SPACE(dev);
1727         int tlen = dev->needed_tailroom;
1728         int err, len, payload_len, full_len;
1729         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1730                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1731                      IPV6_TLV_PADN, 0 };
1732         struct flowi6 fl6;
1733         struct dst_entry *dst;
1734
1735         if (type == ICMPV6_MGM_REDUCTION)
1736                 snd_addr = &in6addr_linklocal_allrouters;
1737         else
1738                 snd_addr = addr;
1739
1740         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1741         payload_len = len + sizeof(ra);
1742         full_len = sizeof(struct ipv6hdr) + payload_len;
1743
1744         rcu_read_lock();
1745         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1746                       IPSTATS_MIB_OUT, full_len);
1747         rcu_read_unlock();
1748
1749         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1750
1751         if (skb == NULL) {
1752                 rcu_read_lock();
1753                 IP6_INC_STATS(net, __in6_dev_get(dev),
1754                               IPSTATS_MIB_OUTDISCARDS);
1755                 rcu_read_unlock();
1756                 return;
1757         }
1758
1759         skb_reserve(skb, hlen);
1760
1761         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1762                 /* <draft-ietf-magma-mld-source-05.txt>:
1763                  * use unspecified address as the source address
1764                  * when a valid link-local address is not available.
1765                  */
1766                 saddr = &in6addr_any;
1767         } else
1768                 saddr = &addr_buf;
1769
1770         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1771
1772         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1773
1774         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1775         memset(hdr, 0, sizeof(struct mld_msg));
1776         hdr->mld_type = type;
1777         hdr->mld_mca = *addr;
1778
1779         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1780                                          IPPROTO_ICMPV6,
1781                                          csum_partial(hdr, len, 0));
1782
1783         rcu_read_lock();
1784         idev = __in6_dev_get(skb->dev);
1785
1786         icmpv6_flow_init(sk, &fl6, type,
1787                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1788                          skb->dev->ifindex);
1789         dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1790         if (IS_ERR(dst)) {
1791                 err = PTR_ERR(dst);
1792                 goto err_out;
1793         }
1794
1795         skb_dst_set(skb, dst);
1796         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1797                       dst_output);
1798 out:
1799         if (!err) {
1800                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1801                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1802                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1803         } else
1804                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1805
1806         rcu_read_unlock();
1807         return;
1808
1809 err_out:
1810         kfree_skb(skb);
1811         goto out;
1812 }
1813
1814 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1815         const struct in6_addr *psfsrc)
1816 {
1817         struct ip6_sf_list *psf, *psf_prev;
1818         int rv = 0;
1819
1820         psf_prev = NULL;
1821         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1822                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1823                         break;
1824                 psf_prev = psf;
1825         }
1826         if (!psf || psf->sf_count[sfmode] == 0) {
1827                 /* source filter not found, or count wrong =>  bug */
1828                 return -ESRCH;
1829         }
1830         psf->sf_count[sfmode]--;
1831         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1832                 struct inet6_dev *idev = pmc->idev;
1833
1834                 /* no more filters for this source */
1835                 if (psf_prev)
1836                         psf_prev->sf_next = psf->sf_next;
1837                 else
1838                         pmc->mca_sources = psf->sf_next;
1839                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1840                     !MLD_V1_SEEN(idev)) {
1841                         psf->sf_crcount = idev->mc_qrv;
1842                         psf->sf_next = pmc->mca_tomb;
1843                         pmc->mca_tomb = psf;
1844                         rv = 1;
1845                 } else
1846                         kfree(psf);
1847         }
1848         return rv;
1849 }
1850
1851 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1852                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1853                           int delta)
1854 {
1855         struct ifmcaddr6 *pmc;
1856         int     changerec = 0;
1857         int     i, err;
1858
1859         if (!idev)
1860                 return -ENODEV;
1861         read_lock_bh(&idev->lock);
1862         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1863                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1864                         break;
1865         }
1866         if (!pmc) {
1867                 /* MCA not found?? bug */
1868                 read_unlock_bh(&idev->lock);
1869                 return -ESRCH;
1870         }
1871         spin_lock_bh(&pmc->mca_lock);
1872         sf_markstate(pmc);
1873         if (!delta) {
1874                 if (!pmc->mca_sfcount[sfmode]) {
1875                         spin_unlock_bh(&pmc->mca_lock);
1876                         read_unlock_bh(&idev->lock);
1877                         return -EINVAL;
1878                 }
1879                 pmc->mca_sfcount[sfmode]--;
1880         }
1881         err = 0;
1882         for (i=0; i<sfcount; i++) {
1883                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1884
1885                 changerec |= rv > 0;
1886                 if (!err && rv < 0)
1887                         err = rv;
1888         }
1889         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1890             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1891             pmc->mca_sfcount[MCAST_INCLUDE]) {
1892                 struct ip6_sf_list *psf;
1893
1894                 /* filter mode change */
1895                 pmc->mca_sfmode = MCAST_INCLUDE;
1896                 pmc->mca_crcount = idev->mc_qrv;
1897                 idev->mc_ifc_count = pmc->mca_crcount;
1898                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1899                         psf->sf_crcount = 0;
1900                 mld_ifc_event(pmc->idev);
1901         } else if (sf_setstate(pmc) || changerec)
1902                 mld_ifc_event(pmc->idev);
1903         spin_unlock_bh(&pmc->mca_lock);
1904         read_unlock_bh(&idev->lock);
1905         return err;
1906 }
1907
1908 /*
1909  * Add multicast single-source filter to the interface list
1910  */
1911 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1912         const struct in6_addr *psfsrc)
1913 {
1914         struct ip6_sf_list *psf, *psf_prev;
1915
1916         psf_prev = NULL;
1917         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1918                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1919                         break;
1920                 psf_prev = psf;
1921         }
1922         if (!psf) {
1923                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1924                 if (!psf)
1925                         return -ENOBUFS;
1926
1927                 psf->sf_addr = *psfsrc;
1928                 if (psf_prev) {
1929                         psf_prev->sf_next = psf;
1930                 } else
1931                         pmc->mca_sources = psf;
1932         }
1933         psf->sf_count[sfmode]++;
1934         return 0;
1935 }
1936
1937 static void sf_markstate(struct ifmcaddr6 *pmc)
1938 {
1939         struct ip6_sf_list *psf;
1940         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1941
1942         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1943                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1944                         psf->sf_oldin = mca_xcount ==
1945                                 psf->sf_count[MCAST_EXCLUDE] &&
1946                                 !psf->sf_count[MCAST_INCLUDE];
1947                 } else
1948                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1949 }
1950
1951 static int sf_setstate(struct ifmcaddr6 *pmc)
1952 {
1953         struct ip6_sf_list *psf, *dpsf;
1954         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1955         int qrv = pmc->idev->mc_qrv;
1956         int new_in, rv;
1957
1958         rv = 0;
1959         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1960                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1961                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1962                                 !psf->sf_count[MCAST_INCLUDE];
1963                 } else
1964                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1965                 if (new_in) {
1966                         if (!psf->sf_oldin) {
1967                                 struct ip6_sf_list *prev = NULL;
1968
1969                                 for (dpsf=pmc->mca_tomb; dpsf;
1970                                      dpsf=dpsf->sf_next) {
1971                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1972                                             &psf->sf_addr))
1973                                                 break;
1974                                         prev = dpsf;
1975                                 }
1976                                 if (dpsf) {
1977                                         if (prev)
1978                                                 prev->sf_next = dpsf->sf_next;
1979                                         else
1980                                                 pmc->mca_tomb = dpsf->sf_next;
1981                                         kfree(dpsf);
1982                                 }
1983                                 psf->sf_crcount = qrv;
1984                                 rv++;
1985                         }
1986                 } else if (psf->sf_oldin) {
1987                         psf->sf_crcount = 0;
1988                         /*
1989                          * add or update "delete" records if an active filter
1990                          * is now inactive
1991                          */
1992                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1993                                 if (ipv6_addr_equal(&dpsf->sf_addr,
1994                                     &psf->sf_addr))
1995                                         break;
1996                         if (!dpsf) {
1997                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1998                                 if (!dpsf)
1999                                         continue;
2000                                 *dpsf = *psf;
2001                                 /* pmc->mca_lock held by callers */
2002                                 dpsf->sf_next = pmc->mca_tomb;
2003                                 pmc->mca_tomb = dpsf;
2004                         }
2005                         dpsf->sf_crcount = qrv;
2006                         rv++;
2007                 }
2008         }
2009         return rv;
2010 }
2011
2012 /*
2013  * Add multicast source filter list to the interface list
2014  */
2015 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2016                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2017                           int delta)
2018 {
2019         struct ifmcaddr6 *pmc;
2020         int     isexclude;
2021         int     i, err;
2022
2023         if (!idev)
2024                 return -ENODEV;
2025         read_lock_bh(&idev->lock);
2026         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2027                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2028                         break;
2029         }
2030         if (!pmc) {
2031                 /* MCA not found?? bug */
2032                 read_unlock_bh(&idev->lock);
2033                 return -ESRCH;
2034         }
2035         spin_lock_bh(&pmc->mca_lock);
2036
2037         sf_markstate(pmc);
2038         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2039         if (!delta)
2040                 pmc->mca_sfcount[sfmode]++;
2041         err = 0;
2042         for (i=0; i<sfcount; i++) {
2043                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2044                 if (err)
2045                         break;
2046         }
2047         if (err) {
2048                 int j;
2049
2050                 if (!delta)
2051                         pmc->mca_sfcount[sfmode]--;
2052                 for (j=0; j<i; j++)
2053                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2054         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2055                 struct ip6_sf_list *psf;
2056
2057                 /* filter mode change */
2058                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2059                         pmc->mca_sfmode = MCAST_EXCLUDE;
2060                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2061                         pmc->mca_sfmode = MCAST_INCLUDE;
2062                 /* else no filters; keep old mode for reports */
2063
2064                 pmc->mca_crcount = idev->mc_qrv;
2065                 idev->mc_ifc_count = pmc->mca_crcount;
2066                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2067                         psf->sf_crcount = 0;
2068                 mld_ifc_event(idev);
2069         } else if (sf_setstate(pmc))
2070                 mld_ifc_event(idev);
2071         spin_unlock_bh(&pmc->mca_lock);
2072         read_unlock_bh(&idev->lock);
2073         return err;
2074 }
2075
2076 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2077 {
2078         struct ip6_sf_list *psf, *nextpsf;
2079
2080         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2081                 nextpsf = psf->sf_next;
2082                 kfree(psf);
2083         }
2084         pmc->mca_tomb = NULL;
2085         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2086                 nextpsf = psf->sf_next;
2087                 kfree(psf);
2088         }
2089         pmc->mca_sources = NULL;
2090         pmc->mca_sfmode = MCAST_EXCLUDE;
2091         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2092         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2093 }
2094
2095
2096 static void igmp6_join_group(struct ifmcaddr6 *ma)
2097 {
2098         unsigned long delay;
2099
2100         if (ma->mca_flags & MAF_NOREPORT)
2101                 return;
2102
2103         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2104
2105         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2106
2107         spin_lock_bh(&ma->mca_lock);
2108         if (del_timer(&ma->mca_timer)) {
2109                 atomic_dec(&ma->mca_refcnt);
2110                 delay = ma->mca_timer.expires - jiffies;
2111         }
2112
2113         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2114                 atomic_inc(&ma->mca_refcnt);
2115         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2116         spin_unlock_bh(&ma->mca_lock);
2117 }
2118
2119 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2120                             struct inet6_dev *idev)
2121 {
2122         int err;
2123
2124         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2125          * so no other readers or writers of iml or its sflist
2126          */
2127         if (!iml->sflist) {
2128                 /* any-source empty exclude case */
2129                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2130         }
2131         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2132                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2133         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2134         iml->sflist = NULL;
2135         return err;
2136 }
2137
2138 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2139 {
2140         if (MLD_V1_SEEN(ma->idev)) {
2141                 if (ma->mca_flags & MAF_LAST_REPORTER)
2142                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2143                                 ICMPV6_MGM_REDUCTION);
2144         } else {
2145                 mld_add_delrec(ma->idev, ma);
2146                 mld_ifc_event(ma->idev);
2147         }
2148 }
2149
2150 static void mld_gq_timer_expire(unsigned long data)
2151 {
2152         struct inet6_dev *idev = (struct inet6_dev *)data;
2153
2154         idev->mc_gq_running = 0;
2155         mld_send_report(idev, NULL);
2156         __in6_dev_put(idev);
2157 }
2158
2159 static void mld_ifc_timer_expire(unsigned long data)
2160 {
2161         struct inet6_dev *idev = (struct inet6_dev *)data;
2162
2163         mld_send_cr(idev);
2164         if (idev->mc_ifc_count) {
2165                 idev->mc_ifc_count--;
2166                 if (idev->mc_ifc_count)
2167                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2168         }
2169         __in6_dev_put(idev);
2170 }
2171
2172 static void mld_ifc_event(struct inet6_dev *idev)
2173 {
2174         if (MLD_V1_SEEN(idev))
2175                 return;
2176         idev->mc_ifc_count = idev->mc_qrv;
2177         mld_ifc_start_timer(idev, 1);
2178 }
2179
2180
2181 static void igmp6_timer_handler(unsigned long data)
2182 {
2183         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2184
2185         if (MLD_V1_SEEN(ma->idev))
2186                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2187         else
2188                 mld_send_report(ma->idev, ma);
2189
2190         spin_lock(&ma->mca_lock);
2191         ma->mca_flags |=  MAF_LAST_REPORTER;
2192         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2193         spin_unlock(&ma->mca_lock);
2194         ma_put(ma);
2195 }
2196
2197 /* Device changing type */
2198
2199 void ipv6_mc_unmap(struct inet6_dev *idev)
2200 {
2201         struct ifmcaddr6 *i;
2202
2203         /* Install multicast list, except for all-nodes (already installed) */
2204
2205         read_lock_bh(&idev->lock);
2206         for (i = idev->mc_list; i; i = i->next)
2207                 igmp6_group_dropped(i);
2208         read_unlock_bh(&idev->lock);
2209 }
2210
2211 void ipv6_mc_remap(struct inet6_dev *idev)
2212 {
2213         ipv6_mc_up(idev);
2214 }
2215
2216 /* Device going down */
2217
2218 void ipv6_mc_down(struct inet6_dev *idev)
2219 {
2220         struct ifmcaddr6 *i;
2221
2222         /* Withdraw multicast list */
2223
2224         read_lock_bh(&idev->lock);
2225         idev->mc_ifc_count = 0;
2226         if (del_timer(&idev->mc_ifc_timer))
2227                 __in6_dev_put(idev);
2228         idev->mc_gq_running = 0;
2229         if (del_timer(&idev->mc_gq_timer))
2230                 __in6_dev_put(idev);
2231
2232         for (i = idev->mc_list; i; i=i->next)
2233                 igmp6_group_dropped(i);
2234         read_unlock_bh(&idev->lock);
2235
2236         mld_clear_delrec(idev);
2237 }
2238
2239
2240 /* Device going up */
2241
2242 void ipv6_mc_up(struct inet6_dev *idev)
2243 {
2244         struct ifmcaddr6 *i;
2245
2246         /* Install multicast list, except for all-nodes (already installed) */
2247
2248         read_lock_bh(&idev->lock);
2249         for (i = idev->mc_list; i; i=i->next)
2250                 igmp6_group_added(i);
2251         read_unlock_bh(&idev->lock);
2252 }
2253
2254 /* IPv6 device initialization. */
2255
2256 void ipv6_mc_init_dev(struct inet6_dev *idev)
2257 {
2258         write_lock_bh(&idev->lock);
2259         spin_lock_init(&idev->mc_lock);
2260         idev->mc_gq_running = 0;
2261         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2262                         (unsigned long)idev);
2263         idev->mc_tomb = NULL;
2264         idev->mc_ifc_count = 0;
2265         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2266                         (unsigned long)idev);
2267         idev->mc_qrv = MLD_QRV_DEFAULT;
2268         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2269         idev->mc_v1_seen = 0;
2270         write_unlock_bh(&idev->lock);
2271 }
2272
2273 /*
2274  *      Device is about to be destroyed: clean up.
2275  */
2276
2277 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2278 {
2279         struct ifmcaddr6 *i;
2280
2281         /* Deactivate timers */
2282         ipv6_mc_down(idev);
2283
2284         /* Delete all-nodes address. */
2285         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2286          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2287          * fail.
2288          */
2289         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2290
2291         if (idev->cnf.forwarding)
2292                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2293
2294         write_lock_bh(&idev->lock);
2295         while ((i = idev->mc_list) != NULL) {
2296                 idev->mc_list = i->next;
2297                 write_unlock_bh(&idev->lock);
2298
2299                 igmp6_group_dropped(i);
2300                 ma_put(i);
2301
2302                 write_lock_bh(&idev->lock);
2303         }
2304         write_unlock_bh(&idev->lock);
2305 }
2306
2307 #ifdef CONFIG_PROC_FS
2308 struct igmp6_mc_iter_state {
2309         struct seq_net_private p;
2310         struct net_device *dev;
2311         struct inet6_dev *idev;
2312 };
2313
2314 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2315
2316 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2317 {
2318         struct ifmcaddr6 *im = NULL;
2319         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2320         struct net *net = seq_file_net(seq);
2321
2322         state->idev = NULL;
2323         for_each_netdev_rcu(net, state->dev) {
2324                 struct inet6_dev *idev;
2325                 idev = __in6_dev_get(state->dev);
2326                 if (!idev)
2327                         continue;
2328                 read_lock_bh(&idev->lock);
2329                 im = idev->mc_list;
2330                 if (im) {
2331                         state->idev = idev;
2332                         break;
2333                 }
2334                 read_unlock_bh(&idev->lock);
2335         }
2336         return im;
2337 }
2338
2339 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2340 {
2341         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2342
2343         im = im->next;
2344         while (!im) {
2345                 if (likely(state->idev != NULL))
2346                         read_unlock_bh(&state->idev->lock);
2347
2348                 state->dev = next_net_device_rcu(state->dev);
2349                 if (!state->dev) {
2350                         state->idev = NULL;
2351                         break;
2352                 }
2353                 state->idev = __in6_dev_get(state->dev);
2354                 if (!state->idev)
2355                         continue;
2356                 read_lock_bh(&state->idev->lock);
2357                 im = state->idev->mc_list;
2358         }
2359         return im;
2360 }
2361
2362 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2363 {
2364         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2365         if (im)
2366                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2367                         --pos;
2368         return pos ? NULL : im;
2369 }
2370
2371 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2372         __acquires(RCU)
2373 {
2374         rcu_read_lock();
2375         return igmp6_mc_get_idx(seq, *pos);
2376 }
2377
2378 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2379 {
2380         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2381
2382         ++*pos;
2383         return im;
2384 }
2385
2386 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2387         __releases(RCU)
2388 {
2389         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2390
2391         if (likely(state->idev != NULL)) {
2392                 read_unlock_bh(&state->idev->lock);
2393                 state->idev = NULL;
2394         }
2395         state->dev = NULL;
2396         rcu_read_unlock();
2397 }
2398
2399 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2400 {
2401         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2402         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2403
2404         seq_printf(seq,
2405                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2406                    state->dev->ifindex, state->dev->name,
2407                    &im->mca_addr,
2408                    im->mca_users, im->mca_flags,
2409                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2410                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2411         return 0;
2412 }
2413
2414 static const struct seq_operations igmp6_mc_seq_ops = {
2415         .start  =       igmp6_mc_seq_start,
2416         .next   =       igmp6_mc_seq_next,
2417         .stop   =       igmp6_mc_seq_stop,
2418         .show   =       igmp6_mc_seq_show,
2419 };
2420
2421 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2422 {
2423         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2424                             sizeof(struct igmp6_mc_iter_state));
2425 }
2426
2427 static const struct file_operations igmp6_mc_seq_fops = {
2428         .owner          =       THIS_MODULE,
2429         .open           =       igmp6_mc_seq_open,
2430         .read           =       seq_read,
2431         .llseek         =       seq_lseek,
2432         .release        =       seq_release_net,
2433 };
2434
2435 struct igmp6_mcf_iter_state {
2436         struct seq_net_private p;
2437         struct net_device *dev;
2438         struct inet6_dev *idev;
2439         struct ifmcaddr6 *im;
2440 };
2441
2442 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2443
2444 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2445 {
2446         struct ip6_sf_list *psf = NULL;
2447         struct ifmcaddr6 *im = NULL;
2448         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2449         struct net *net = seq_file_net(seq);
2450
2451         state->idev = NULL;
2452         state->im = NULL;
2453         for_each_netdev_rcu(net, state->dev) {
2454                 struct inet6_dev *idev;
2455                 idev = __in6_dev_get(state->dev);
2456                 if (unlikely(idev == NULL))
2457                         continue;
2458                 read_lock_bh(&idev->lock);
2459                 im = idev->mc_list;
2460                 if (likely(im != NULL)) {
2461                         spin_lock_bh(&im->mca_lock);
2462                         psf = im->mca_sources;
2463                         if (likely(psf != NULL)) {
2464                                 state->im = im;
2465                                 state->idev = idev;
2466                                 break;
2467                         }
2468                         spin_unlock_bh(&im->mca_lock);
2469                 }
2470                 read_unlock_bh(&idev->lock);
2471         }
2472         return psf;
2473 }
2474
2475 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2476 {
2477         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2478
2479         psf = psf->sf_next;
2480         while (!psf) {
2481                 spin_unlock_bh(&state->im->mca_lock);
2482                 state->im = state->im->next;
2483                 while (!state->im) {
2484                         if (likely(state->idev != NULL))
2485                                 read_unlock_bh(&state->idev->lock);
2486
2487                         state->dev = next_net_device_rcu(state->dev);
2488                         if (!state->dev) {
2489                                 state->idev = NULL;
2490                                 goto out;
2491                         }
2492                         state->idev = __in6_dev_get(state->dev);
2493                         if (!state->idev)
2494                                 continue;
2495                         read_lock_bh(&state->idev->lock);
2496                         state->im = state->idev->mc_list;
2497                 }
2498                 if (!state->im)
2499                         break;
2500                 spin_lock_bh(&state->im->mca_lock);
2501                 psf = state->im->mca_sources;
2502         }
2503 out:
2504         return psf;
2505 }
2506
2507 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2508 {
2509         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2510         if (psf)
2511                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2512                         --pos;
2513         return pos ? NULL : psf;
2514 }
2515
2516 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2517         __acquires(RCU)
2518 {
2519         rcu_read_lock();
2520         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2521 }
2522
2523 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2524 {
2525         struct ip6_sf_list *psf;
2526         if (v == SEQ_START_TOKEN)
2527                 psf = igmp6_mcf_get_first(seq);
2528         else
2529                 psf = igmp6_mcf_get_next(seq, v);
2530         ++*pos;
2531         return psf;
2532 }
2533
2534 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2535         __releases(RCU)
2536 {
2537         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2538         if (likely(state->im != NULL)) {
2539                 spin_unlock_bh(&state->im->mca_lock);
2540                 state->im = NULL;
2541         }
2542         if (likely(state->idev != NULL)) {
2543                 read_unlock_bh(&state->idev->lock);
2544                 state->idev = NULL;
2545         }
2546         state->dev = NULL;
2547         rcu_read_unlock();
2548 }
2549
2550 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2551 {
2552         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2553         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2554
2555         if (v == SEQ_START_TOKEN) {
2556                 seq_printf(seq,
2557                            "%3s %6s "
2558                            "%32s %32s %6s %6s\n", "Idx",
2559                            "Device", "Multicast Address",
2560                            "Source Address", "INC", "EXC");
2561         } else {
2562                 seq_printf(seq,
2563                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2564                            state->dev->ifindex, state->dev->name,
2565                            &state->im->mca_addr,
2566                            &psf->sf_addr,
2567                            psf->sf_count[MCAST_INCLUDE],
2568                            psf->sf_count[MCAST_EXCLUDE]);
2569         }
2570         return 0;
2571 }
2572
2573 static const struct seq_operations igmp6_mcf_seq_ops = {
2574         .start  =       igmp6_mcf_seq_start,
2575         .next   =       igmp6_mcf_seq_next,
2576         .stop   =       igmp6_mcf_seq_stop,
2577         .show   =       igmp6_mcf_seq_show,
2578 };
2579
2580 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2581 {
2582         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2583                             sizeof(struct igmp6_mcf_iter_state));
2584 }
2585
2586 static const struct file_operations igmp6_mcf_seq_fops = {
2587         .owner          =       THIS_MODULE,
2588         .open           =       igmp6_mcf_seq_open,
2589         .read           =       seq_read,
2590         .llseek         =       seq_lseek,
2591         .release        =       seq_release_net,
2592 };
2593
2594 static int __net_init igmp6_proc_init(struct net *net)
2595 {
2596         int err;
2597
2598         err = -ENOMEM;
2599         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2600                 goto out;
2601         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2602                                   &igmp6_mcf_seq_fops))
2603                 goto out_proc_net_igmp6;
2604
2605         err = 0;
2606 out:
2607         return err;
2608
2609 out_proc_net_igmp6:
2610         proc_net_remove(net, "igmp6");
2611         goto out;
2612 }
2613
2614 static void __net_exit igmp6_proc_exit(struct net *net)
2615 {
2616         proc_net_remove(net, "mcfilter6");
2617         proc_net_remove(net, "igmp6");
2618 }
2619 #else
2620 static inline int igmp6_proc_init(struct net *net)
2621 {
2622         return 0;
2623 }
2624 static inline void igmp6_proc_exit(struct net *net)
2625 {
2626 }
2627 #endif
2628
2629 static int __net_init igmp6_net_init(struct net *net)
2630 {
2631         int err;
2632
2633         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2634                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2635         if (err < 0) {
2636                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2637                        err);
2638                 goto out;
2639         }
2640
2641         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2642
2643         err = igmp6_proc_init(net);
2644         if (err)
2645                 goto out_sock_create;
2646 out:
2647         return err;
2648
2649 out_sock_create:
2650         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2651         goto out;
2652 }
2653
2654 static void __net_exit igmp6_net_exit(struct net *net)
2655 {
2656         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2657         igmp6_proc_exit(net);
2658 }
2659
2660 static struct pernet_operations igmp6_net_ops = {
2661         .init = igmp6_net_init,
2662         .exit = igmp6_net_exit,
2663 };
2664
2665 int __init igmp6_init(void)
2666 {
2667         return register_pernet_subsys(&igmp6_net_ops);
2668 }
2669
2670 void igmp6_cleanup(void)
2671 {
2672         unregister_pernet_subsys(&igmp6_net_ops);
2673 }