net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <net/mld.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/net_namespace.h>
  53 #include <net/sock.h>
  54 #include <net/snmp.h>
  55
  56 #include <net/ipv6.h>
  57 #include <net/protocol.h>
  58 #include <net/if_inet6.h>
  59 #include <net/ndisc.h>
  60 #include <net/addrconf.h>
  61 #include <net/ip6_route.h>
  62 #include <net/inet_common.h>
  63
  64 #include <net/ip6_checksum.h>
  65
  66 /* Set to 3 to get tracing... */
  67 #define MCAST_DEBUG 2
  68
  69 #if MCAST_DEBUG >= 3
  70 #define MDBG(x) printk x
  71 #else
  72 #define MDBG(x)
  73 #endif
  74
  75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  77         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  80 };
  81
  82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84 /* Big mc list lock for all the sockets */
  85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  86
  87 static void igmp6_join_group(struct ifmcaddr6 *ma);
  88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89 static void igmp6_timer_handler(unsigned long data);
  90
  91 static void mld_gq_timer_expire(unsigned long data);
  92 static void mld_ifc_timer_expire(unsigned long data);
  93 static void mld_ifc_event(struct inet6_dev *idev);
  94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  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         ipv6_addr_copy(&mc_lst->addr, addr);
 159
 160         rcu_read_lock();
 161         if (ifindex == 0) {
 162                 struct rt6_info *rt;
 163                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 164                 if (rt) {
 165                         dev = rt->rt6i_dev;
 166                         dst_release(&rt->dst);
 167                 }
 168         } else
 169                 dev = dev_get_by_index_rcu(net, ifindex);
 170
 171         if (dev == NULL) {
 172                 rcu_read_unlock();
 173                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 174                 return -ENODEV;
 175         }
 176
 177         mc_lst->ifindex = dev->ifindex;
 178         mc_lst->sfmode = MCAST_EXCLUDE;
 179         rwlock_init(&mc_lst->sflock);
 180         mc_lst->sflist = NULL;
 181
 182         /*
 183          *      now add/increase the group membership on the device
 184          */
 185
 186         err = ipv6_dev_mc_inc(dev, addr);
 187
 188         if (err) {
 189                 rcu_read_unlock();
 190                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 191                 return err;
 192         }
 193
 194         spin_lock(&ipv6_sk_mc_lock);
 195         mc_lst->next = np->ipv6_mc_list;
 196         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 197         spin_unlock(&ipv6_sk_mc_lock);
 198
 199         rcu_read_unlock();
 200
 201         return 0;
 202 }
 203
 204 /*
 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         spin_lock(&ipv6_sk_mc_lock);
 215         for (lnk = &np->ipv6_mc_list;
 216              (mc_lst = rcu_dereference_protected(*lnk,
 217                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 218               lnk = &mc_lst->next) {
 219                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 220                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 221                         struct net_device *dev;
 222
 223                         *lnk = mc_lst->next;
 224                         spin_unlock(&ipv6_sk_mc_lock);
 225
 226                         rcu_read_lock();
 227                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 228                         if (dev != NULL) {
 229                                 struct inet6_dev *idev = __in6_dev_get(dev);
 230
 231                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 232                                 if (idev)
 233                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 234                         } else
 235                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 236                         rcu_read_unlock();
 237                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 238                         kfree_rcu(mc_lst, rcu);
 239                         return 0;
 240                 }
 241         }
 242         spin_unlock(&ipv6_sk_mc_lock);
 243
 244         return -EADDRNOTAVAIL;
 245 }
 246
 247 /* called with rcu_read_lock() */
 248 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 249                                              const struct in6_addr *group,
 250                                              int ifindex)
 251 {
 252         struct net_device *dev = NULL;
 253         struct inet6_dev *idev = NULL;
 254
 255         if (ifindex == 0) {
 256                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 257
 258                 if (rt) {
 259                         dev = rt->rt6i_dev;
 260                         dst_release(&rt->dst);
 261                 }
 262         } else
 263                 dev = dev_get_by_index_rcu(net, ifindex);
 264
 265         if (!dev)
 266                 return NULL;
 267         idev = __in6_dev_get(dev);
 268         if (!idev)
 269                 return NULL;
 270         read_lock_bh(&idev->lock);
 271         if (idev->dead) {
 272                 read_unlock_bh(&idev->lock);
 273                 return NULL;
 274         }
 275         return idev;
 276 }
 277
 278 void ipv6_sock_mc_close(struct sock *sk)
 279 {
 280         struct ipv6_pinfo *np = inet6_sk(sk);
 281         struct ipv6_mc_socklist *mc_lst;
 282         struct net *net = sock_net(sk);
 283
 284         spin_lock(&ipv6_sk_mc_lock);
 285         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 286                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 287                 struct net_device *dev;
 288
 289                 np->ipv6_mc_list = mc_lst->next;
 290                 spin_unlock(&ipv6_sk_mc_lock);
 291
 292                 rcu_read_lock();
 293                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 294                 if (dev) {
 295                         struct inet6_dev *idev = __in6_dev_get(dev);
 296
 297                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 298                         if (idev)
 299                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 300                 } else
 301                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 302                 rcu_read_unlock();
 303
 304                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 305                 kfree_rcu(mc_lst, rcu);
 306
 307                 spin_lock(&ipv6_sk_mc_lock);
 308         }
 309         spin_unlock(&ipv6_sk_mc_lock);
 310 }
 311
 312 int ip6_mc_source(int add, int omode, struct sock *sk,
 313         struct group_source_req *pgsr)
 314 {
 315         struct in6_addr *source, *group;
 316         struct ipv6_mc_socklist *pmc;
 317         struct inet6_dev *idev;
 318         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 319         struct ip6_sf_socklist *psl;
 320         struct net *net = sock_net(sk);
 321         int i, j, rv;
 322         int leavegroup = 0;
 323         int pmclocked = 0;
 324         int err;
 325
 326         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 327         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 328
 329         if (!ipv6_addr_is_multicast(group))
 330                 return -EINVAL;
 331
 332         rcu_read_lock();
 333         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 334         if (!idev) {
 335                 rcu_read_unlock();
 336                 return -ENODEV;
 337         }
 338
 339         err = -EADDRNOTAVAIL;
 340
 341         for_each_pmc_rcu(inet6, pmc) {
 342                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 343                         continue;
 344                 if (ipv6_addr_equal(&pmc->addr, group))
 345                         break;
 346         }
 347         if (!pmc) {             /* must have a prior join */
 348                 err = -EINVAL;
 349                 goto done;
 350         }
 351         /* if a source filter was set, must be the same mode as before */
 352         if (pmc->sflist) {
 353                 if (pmc->sfmode != omode) {
 354                         err = -EINVAL;
 355                         goto done;
 356                 }
 357         } else if (pmc->sfmode != omode) {
 358                 /* allow mode switches for empty-set filters */
 359                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 360                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 361                 pmc->sfmode = omode;
 362         }
 363
 364         write_lock(&pmc->sflock);
 365         pmclocked = 1;
 366
 367         psl = pmc->sflist;
 368         if (!add) {
 369                 if (!psl)
 370                         goto done;      /* err = -EADDRNOTAVAIL */
 371                 rv = !0;
 372                 for (i=0; i<psl->sl_count; i++) {
 373                         rv = memcmp(&psl->sl_addr[i], source,
 374                                 sizeof(struct in6_addr));
 375                         if (rv == 0)
 376                                 break;
 377                 }
 378                 if (rv)         /* source not found */
 379                         goto done;      /* err = -EADDRNOTAVAIL */
 380
 381                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 382                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 383                         leavegroup = 1;
 384                         goto done;
 385                 }
 386
 387                 /* update the interface filter */
 388                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 389
 390                 for (j=i+1; j<psl->sl_count; j++)
 391                         psl->sl_addr[j-1] = psl->sl_addr[j];
 392                 psl->sl_count--;
 393                 err = 0;
 394                 goto done;
 395         }
 396         /* else, add a new source to the filter */
 397
 398         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 399                 err = -ENOBUFS;
 400                 goto done;
 401         }
 402         if (!psl || psl->sl_count == psl->sl_max) {
 403                 struct ip6_sf_socklist *newpsl;
 404                 int count = IP6_SFBLOCK;
 405
 406                 if (psl)
 407                         count += psl->sl_max;
 408                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 409                 if (!newpsl) {
 410                         err = -ENOBUFS;
 411                         goto done;
 412                 }
 413                 newpsl->sl_max = count;
 414                 newpsl->sl_count = count - IP6_SFBLOCK;
 415                 if (psl) {
 416                         for (i=0; i<psl->sl_count; i++)
 417                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 418                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 419                 }
 420                 pmc->sflist = psl = newpsl;
 421         }
 422         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 423         for (i=0; i<psl->sl_count; i++) {
 424                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 425                 if (rv == 0)
 426                         break;
 427         }
 428         if (rv == 0)            /* address already there is an error */
 429                 goto done;
 430         for (j=psl->sl_count-1; j>=i; j--)
 431                 psl->sl_addr[j+1] = psl->sl_addr[j];
 432         psl->sl_addr[i] = *source;
 433         psl->sl_count++;
 434         err = 0;
 435         /* update the interface list */
 436         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 437 done:
 438         if (pmclocked)
 439                 write_unlock(&pmc->sflock);
 440         read_unlock_bh(&idev->lock);
 441         rcu_read_unlock();
 442         if (leavegroup)
 443                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 444         return err;
 445 }
 446
 447 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 448 {
 449         const struct in6_addr *group;
 450         struct ipv6_mc_socklist *pmc;
 451         struct inet6_dev *idev;
 452         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 453         struct ip6_sf_socklist *newpsl, *psl;
 454         struct net *net = sock_net(sk);
 455         int leavegroup = 0;
 456         int i, err;
 457
 458         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 459
 460         if (!ipv6_addr_is_multicast(group))
 461                 return -EINVAL;
 462         if (gsf->gf_fmode != MCAST_INCLUDE &&
 463             gsf->gf_fmode != MCAST_EXCLUDE)
 464                 return -EINVAL;
 465
 466         rcu_read_lock();
 467         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 468
 469         if (!idev) {
 470                 rcu_read_unlock();
 471                 return -ENODEV;
 472         }
 473
 474         err = 0;
 475
 476         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 477                 leavegroup = 1;
 478                 goto done;
 479         }
 480
 481         for_each_pmc_rcu(inet6, pmc) {
 482                 if (pmc->ifindex != gsf->gf_interface)
 483                         continue;
 484                 if (ipv6_addr_equal(&pmc->addr, group))
 485                         break;
 486         }
 487         if (!pmc) {             /* must have a prior join */
 488                 err = -EINVAL;
 489                 goto done;
 490         }
 491         if (gsf->gf_numsrc) {
 492                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 493                                                           GFP_ATOMIC);
 494                 if (!newpsl) {
 495                         err = -ENOBUFS;
 496                         goto done;
 497                 }
 498                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 499                 for (i=0; i<newpsl->sl_count; ++i) {
 500                         struct sockaddr_in6 *psin6;
 501
 502                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 503                         newpsl->sl_addr[i] = psin6->sin6_addr;
 504                 }
 505                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 506                         newpsl->sl_count, newpsl->sl_addr, 0);
 507                 if (err) {
 508                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 509                         goto done;
 510                 }
 511         } else {
 512                 newpsl = NULL;
 513                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 514         }
 515
 516         write_lock(&pmc->sflock);
 517         psl = pmc->sflist;
 518         if (psl) {
 519                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 520                         psl->sl_count, psl->sl_addr, 0);
 521                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 522         } else
 523                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 524         pmc->sflist = newpsl;
 525         pmc->sfmode = gsf->gf_fmode;
 526         write_unlock(&pmc->sflock);
 527         err = 0;
 528 done:
 529         read_unlock_bh(&idev->lock);
 530         rcu_read_unlock();
 531         if (leavegroup)
 532                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 533         return err;
 534 }
 535
 536 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 537         struct group_filter __user *optval, int __user *optlen)
 538 {
 539         int err, i, count, copycount;
 540         const struct in6_addr *group;
 541         struct ipv6_mc_socklist *pmc;
 542         struct inet6_dev *idev;
 543         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 544         struct ip6_sf_socklist *psl;
 545         struct net *net = sock_net(sk);
 546
 547         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 548
 549         if (!ipv6_addr_is_multicast(group))
 550                 return -EINVAL;
 551
 552         rcu_read_lock();
 553         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 554
 555         if (!idev) {
 556                 rcu_read_unlock();
 557                 return -ENODEV;
 558         }
 559
 560         err = -EADDRNOTAVAIL;
 561         /*
 562          * changes to the ipv6_mc_list require the socket lock and
 563          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 564          * so reading the list is safe.
 565          */
 566
 567         for_each_pmc_rcu(inet6, pmc) {
 568                 if (pmc->ifindex != gsf->gf_interface)
 569                         continue;
 570                 if (ipv6_addr_equal(group, &pmc->addr))
 571                         break;
 572         }
 573         if (!pmc)               /* must have a prior join */
 574                 goto done;
 575         gsf->gf_fmode = pmc->sfmode;
 576         psl = pmc->sflist;
 577         count = psl ? psl->sl_count : 0;
 578         read_unlock_bh(&idev->lock);
 579         rcu_read_unlock();
 580
 581         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 582         gsf->gf_numsrc = count;
 583         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 584             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 585                 return -EFAULT;
 586         }
 587         /* changes to psl require the socket lock, a read lock on
 588          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 589          * have the socket lock, so reading here is safe.
 590          */
 591         for (i=0; i<copycount; i++) {
 592                 struct sockaddr_in6 *psin6;
 593                 struct sockaddr_storage ss;
 594
 595                 psin6 = (struct sockaddr_in6 *)&ss;
 596                 memset(&ss, 0, sizeof(ss));
 597                 psin6->sin6_family = AF_INET6;
 598                 psin6->sin6_addr = psl->sl_addr[i];
 599                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 600                         return -EFAULT;
 601         }
 602         return 0;
 603 done:
 604         read_unlock_bh(&idev->lock);
 605         rcu_read_unlock();
 606         return err;
 607 }
 608
 609 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 610                    const struct in6_addr *src_addr)
 611 {
 612         struct ipv6_pinfo *np = inet6_sk(sk);
 613         struct ipv6_mc_socklist *mc;
 614         struct ip6_sf_socklist *psl;
 615         int rv = 1;
 616
 617         rcu_read_lock();
 618         for_each_pmc_rcu(np, mc) {
 619                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 620                         break;
 621         }
 622         if (!mc) {
 623                 rcu_read_unlock();
 624                 return 1;
 625         }
 626         read_lock(&mc->sflock);
 627         psl = mc->sflist;
 628         if (!psl) {
 629                 rv = mc->sfmode == MCAST_EXCLUDE;
 630         } else {
 631                 int i;
 632
 633                 for (i=0; i<psl->sl_count; i++) {
 634                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 635                                 break;
 636                 }
 637                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 638                         rv = 0;
 639                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 640                         rv = 0;
 641         }
 642         read_unlock(&mc->sflock);
 643         rcu_read_unlock();
 644
 645         return rv;
 646 }
 647
 648 static void ma_put(struct ifmcaddr6 *mc)
 649 {
 650         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 651                 in6_dev_put(mc->idev);
 652                 kfree(mc);
 653         }
 654 }
 655
 656 static void igmp6_group_added(struct ifmcaddr6 *mc)
 657 {
 658         struct net_device *dev = mc->idev->dev;
 659         char buf[MAX_ADDR_LEN];
 660
 661         spin_lock_bh(&mc->mca_lock);
 662         if (!(mc->mca_flags&MAF_LOADED)) {
 663                 mc->mca_flags |= MAF_LOADED;
 664                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 665                         dev_mc_add(dev, buf);
 666         }
 667         spin_unlock_bh(&mc->mca_lock);
 668
 669         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 670                 return;
 671
 672         if (MLD_V1_SEEN(mc->idev)) {
 673                 igmp6_join_group(mc);
 674                 return;
 675         }
 676         /* else v2 */
 677
 678         mc->mca_crcount = mc->idev->mc_qrv;
 679         mld_ifc_event(mc->idev);
 680 }
 681
 682 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 683 {
 684         struct net_device *dev = mc->idev->dev;
 685         char buf[MAX_ADDR_LEN];
 686
 687         spin_lock_bh(&mc->mca_lock);
 688         if (mc->mca_flags&MAF_LOADED) {
 689                 mc->mca_flags &= ~MAF_LOADED;
 690                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 691                         dev_mc_del(dev, buf);
 692         }
 693
 694         spin_unlock_bh(&mc->mca_lock);
 695         if (mc->mca_flags & MAF_NOREPORT)
 696                 return;
 697
 698         if (!mc->idev->dead)
 699                 igmp6_leave_group(mc);
 700
 701         spin_lock_bh(&mc->mca_lock);
 702         if (del_timer(&mc->mca_timer))
 703                 atomic_dec(&mc->mca_refcnt);
 704         spin_unlock_bh(&mc->mca_lock);
 705 }
 706
 707 /*
 708  * deleted ifmcaddr6 manipulation
 709  */
 710 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 711 {
 712         struct ifmcaddr6 *pmc;
 713
 714         /* this is an "ifmcaddr6" for convenience; only the fields below
 715          * are actually used. In particular, the refcnt and users are not
 716          * used for management of the delete list. Using the same structure
 717          * for deleted items allows change reports to use common code with
 718          * non-deleted or query-response MCA's.
 719          */
 720         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 721         if (!pmc)
 722                 return;
 723
 724         spin_lock_bh(&im->mca_lock);
 725         spin_lock_init(&pmc->mca_lock);
 726         pmc->idev = im->idev;
 727         in6_dev_hold(idev);
 728         pmc->mca_addr = im->mca_addr;
 729         pmc->mca_crcount = idev->mc_qrv;
 730         pmc->mca_sfmode = im->mca_sfmode;
 731         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 732                 struct ip6_sf_list *psf;
 733
 734                 pmc->mca_tomb = im->mca_tomb;
 735                 pmc->mca_sources = im->mca_sources;
 736                 im->mca_tomb = im->mca_sources = NULL;
 737                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 738                         psf->sf_crcount = pmc->mca_crcount;
 739         }
 740         spin_unlock_bh(&im->mca_lock);
 741
 742         spin_lock_bh(&idev->mc_lock);
 743         pmc->next = idev->mc_tomb;
 744         idev->mc_tomb = pmc;
 745         spin_unlock_bh(&idev->mc_lock);
 746 }
 747
 748 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 749 {
 750         struct ifmcaddr6 *pmc, *pmc_prev;
 751         struct ip6_sf_list *psf;
 752         struct in6_addr *pmca = &im->mca_addr;
 753
 754         spin_lock_bh(&idev->mc_lock);
 755         pmc_prev = NULL;
 756         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 757                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 758                         break;
 759                 pmc_prev = pmc;
 760         }
 761         if (pmc) {
 762                 if (pmc_prev)
 763                         pmc_prev->next = pmc->next;
 764                 else
 765                         idev->mc_tomb = pmc->next;
 766         }
 767         spin_unlock_bh(&idev->mc_lock);
 768
 769         spin_lock_bh(&im->mca_lock);
 770         if (pmc) {
 771                 im->idev = pmc->idev;
 772                 im->mca_crcount = idev->mc_qrv;
 773                 im->mca_sfmode = pmc->mca_sfmode;
 774                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
 775                         im->mca_tomb = pmc->mca_tomb;
 776                         im->mca_sources = pmc->mca_sources;
 777                         for (psf = im->mca_sources; psf; psf = psf->sf_next)
 778                                 psf->sf_crcount = im->mca_crcount;
 779                 }
 780                 in6_dev_put(pmc->idev);
 781                 kfree(pmc);
 782         }
 783         spin_unlock_bh(&im->mca_lock);
 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         ipv6_addr_copy(&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);
 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                                 ip6_mc_clear_src(ma);
 908
 909                                 ma_put(ma);
 910                                 return 0;
 911                         }
 912                         write_unlock_bh(&idev->lock);
 913                         return 0;
 914                 }
 915         }
 916         write_unlock_bh(&idev->lock);
 917
 918         return -ENOENT;
 919 }
 920
 921 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 922 {
 923         struct inet6_dev *idev;
 924         int err;
 925
 926         rcu_read_lock();
 927
 928         idev = __in6_dev_get(dev);
 929         if (!idev)
 930                 err = -ENODEV;
 931         else
 932                 err = __ipv6_dev_mc_dec(idev, addr);
 933
 934         rcu_read_unlock();
 935         return err;
 936 }
 937
 938 /*
 939  * identify MLD packets for MLD filter exceptions
 940  */
 941 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 942 {
 943         struct icmp6hdr *pic;
 944
 945         if (nexthdr != IPPROTO_ICMPV6)
 946                 return 0;
 947
 948         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 949                 return 0;
 950
 951         pic = icmp6_hdr(skb);
 952
 953         switch (pic->icmp6_type) {
 954         case ICMPV6_MGM_QUERY:
 955         case ICMPV6_MGM_REPORT:
 956         case ICMPV6_MGM_REDUCTION:
 957         case ICMPV6_MLD2_REPORT:
 958                 return 1;
 959         default:
 960                 break;
 961         }
 962         return 0;
 963 }
 964
 965 /*
 966  *      check if the interface/address pair is valid
 967  */
 968 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 969                         const struct in6_addr *src_addr)
 970 {
 971         struct inet6_dev *idev;
 972         struct ifmcaddr6 *mc;
 973         int rv = 0;
 974
 975         rcu_read_lock();
 976         idev = __in6_dev_get(dev);
 977         if (idev) {
 978                 read_lock_bh(&idev->lock);
 979                 for (mc = idev->mc_list; mc; mc=mc->next) {
 980                         if (ipv6_addr_equal(&mc->mca_addr, group))
 981                                 break;
 982                 }
 983                 if (mc) {
 984                         if (src_addr && !ipv6_addr_any(src_addr)) {
 985                                 struct ip6_sf_list *psf;
 986
 987                                 spin_lock_bh(&mc->mca_lock);
 988                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 989                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 990                                                 break;
 991                                 }
 992                                 if (psf)
 993                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 994                                                 psf->sf_count[MCAST_EXCLUDE] !=
 995                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 996                                 else
 997                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 998                                 spin_unlock_bh(&mc->mca_lock);
 999                         } else
1000                                 rv = 1; /* don't filter unspecified source */
1001                 }
1002                 read_unlock_bh(&idev->lock);
1003         }
1004         rcu_read_unlock();
1005         return rv;
1006 }
1007
1008 static void mld_gq_start_timer(struct inet6_dev *idev)
1009 {
1010         int tv = net_random() % idev->mc_maxdelay;
1011
1012         idev->mc_gq_running = 1;
1013         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1014                 in6_dev_hold(idev);
1015 }
1016
1017 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1018 {
1019         int tv = net_random() % delay;
1020
1021         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1022                 in6_dev_hold(idev);
1023 }
1024
1025 /*
1026  *      IGMP handling (alias multicast ICMPv6 messages)
1027  */
1028
1029 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1030 {
1031         unsigned long delay = resptime;
1032
1033         /* Do not start timer for these addresses */
1034         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1035             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1036                 return;
1037
1038         if (del_timer(&ma->mca_timer)) {
1039                 atomic_dec(&ma->mca_refcnt);
1040                 delay = ma->mca_timer.expires - jiffies;
1041         }
1042
1043         if (delay >= resptime) {
1044                 if (resptime)
1045                         delay = net_random() % resptime;
1046                 else
1047                         delay = 1;
1048         }
1049         ma->mca_timer.expires = jiffies + delay;
1050         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1051                 atomic_inc(&ma->mca_refcnt);
1052         ma->mca_flags |= MAF_TIMER_RUNNING;
1053 }
1054
1055 /* mark EXCLUDE-mode sources */
1056 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1057         const struct in6_addr *srcs)
1058 {
1059         struct ip6_sf_list *psf;
1060         int i, scount;
1061
1062         scount = 0;
1063         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1064                 if (scount == nsrcs)
1065                         break;
1066                 for (i=0; i<nsrcs; i++) {
1067                         /* skip inactive filters */
1068                         if (psf->sf_count[MCAST_INCLUDE] ||
1069                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1070                             psf->sf_count[MCAST_EXCLUDE])
1071                                 continue;
1072                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1073                                 scount++;
1074                                 break;
1075                         }
1076                 }
1077         }
1078         pmc->mca_flags &= ~MAF_GSQUERY;
1079         if (scount == nsrcs)    /* all sources excluded */
1080                 return 0;
1081         return 1;
1082 }
1083
1084 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1085         const struct in6_addr *srcs)
1086 {
1087         struct ip6_sf_list *psf;
1088         int i, scount;
1089
1090         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1091                 return mld_xmarksources(pmc, nsrcs, srcs);
1092
1093         /* mark INCLUDE-mode sources */
1094
1095         scount = 0;
1096         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1097                 if (scount == nsrcs)
1098                         break;
1099                 for (i=0; i<nsrcs; i++) {
1100                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1101                                 psf->sf_gsresp = 1;
1102                                 scount++;
1103                                 break;
1104                         }
1105                 }
1106         }
1107         if (!scount) {
1108                 pmc->mca_flags &= ~MAF_GSQUERY;
1109                 return 0;
1110         }
1111         pmc->mca_flags |= MAF_GSQUERY;
1112         return 1;
1113 }
1114
1115 /* called with rcu_read_lock() */
1116 int igmp6_event_query(struct sk_buff *skb)
1117 {
1118         struct mld2_query *mlh2 = NULL;
1119         struct ifmcaddr6 *ma;
1120         const struct in6_addr *group;
1121         unsigned long max_delay;
1122         struct inet6_dev *idev;
1123         struct mld_msg *mld;
1124         int group_type;
1125         int mark = 0;
1126         int len;
1127
1128         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1129                 return -EINVAL;
1130
1131         /* compute payload length excluding extension headers */
1132         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1133         len -= skb_network_header_len(skb);
1134
1135         /* Drop queries with not link local source */
1136         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1137                 return -EINVAL;
1138
1139         idev = __in6_dev_get(skb->dev);
1140
1141         if (idev == NULL)
1142                 return 0;
1143
1144         mld = (struct mld_msg *)icmp6_hdr(skb);
1145         group = &mld->mld_mca;
1146         group_type = ipv6_addr_type(group);
1147
1148         if (group_type != IPV6_ADDR_ANY &&
1149             !(group_type&IPV6_ADDR_MULTICAST))
1150                 return -EINVAL;
1151
1152         if (len == 24) {
1153                 int switchback;
1154                 /* MLDv1 router present */
1155
1156                 /* Translate milliseconds to jiffies */
1157                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1158
1159                 switchback = (idev->mc_qrv + 1) * max_delay;
1160                 idev->mc_v1_seen = jiffies + switchback;
1161
1162                 /* cancel the interface change timer */
1163                 idev->mc_ifc_count = 0;
1164                 if (del_timer(&idev->mc_ifc_timer))
1165                         __in6_dev_put(idev);
1166                 /* clear deleted report items */
1167                 mld_clear_delrec(idev);
1168         } else if (len >= 28) {
1169                 int srcs_offset = sizeof(struct mld2_query) -
1170                                   sizeof(struct icmp6hdr);
1171                 if (!pskb_may_pull(skb, srcs_offset))
1172                         return -EINVAL;
1173
1174                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1175                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1176                 if (!max_delay)
1177                         max_delay = 1;
1178                 idev->mc_maxdelay = max_delay;
1179                 if (mlh2->mld2q_qrv)
1180                         idev->mc_qrv = mlh2->mld2q_qrv;
1181                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1182                         if (mlh2->mld2q_nsrcs)
1183                                 return -EINVAL; /* no sources allowed */
1184
1185                         mld_gq_start_timer(idev);
1186                         return 0;
1187                 }
1188                 /* mark sources to include, if group & source-specific */
1189                 if (mlh2->mld2q_nsrcs != 0) {
1190                         if (!pskb_may_pull(skb, srcs_offset +
1191                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1192                                 return -EINVAL;
1193
1194                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1195                         mark = 1;
1196                 }
1197         } else
1198                 return -EINVAL;
1199
1200         read_lock_bh(&idev->lock);
1201         if (group_type == IPV6_ADDR_ANY) {
1202                 for (ma = idev->mc_list; ma; ma=ma->next) {
1203                         spin_lock_bh(&ma->mca_lock);
1204                         igmp6_group_queried(ma, max_delay);
1205                         spin_unlock_bh(&ma->mca_lock);
1206                 }
1207         } else {
1208                 for (ma = idev->mc_list; ma; ma=ma->next) {
1209                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1210                                 continue;
1211                         spin_lock_bh(&ma->mca_lock);
1212                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1213                                 /* gsquery <- gsquery && mark */
1214                                 if (!mark)
1215                                         ma->mca_flags &= ~MAF_GSQUERY;
1216                         } else {
1217                                 /* gsquery <- mark */
1218                                 if (mark)
1219                                         ma->mca_flags |= MAF_GSQUERY;
1220                                 else
1221                                         ma->mca_flags &= ~MAF_GSQUERY;
1222                         }
1223                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1224                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1225                                 igmp6_group_queried(ma, max_delay);
1226                         spin_unlock_bh(&ma->mca_lock);
1227                         break;
1228                 }
1229         }
1230         read_unlock_bh(&idev->lock);
1231
1232         return 0;
1233 }
1234
1235 /* called with rcu_read_lock() */
1236 int igmp6_event_report(struct sk_buff *skb)
1237 {
1238         struct ifmcaddr6 *ma;
1239         struct inet6_dev *idev;
1240         struct mld_msg *mld;
1241         int addr_type;
1242
1243         /* Our own report looped back. Ignore it. */
1244         if (skb->pkt_type == PACKET_LOOPBACK)
1245                 return 0;
1246
1247         /* send our report if the MC router may not have heard this report */
1248         if (skb->pkt_type != PACKET_MULTICAST &&
1249             skb->pkt_type != PACKET_BROADCAST)
1250                 return 0;
1251
1252         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1253                 return -EINVAL;
1254
1255         mld = (struct mld_msg *)icmp6_hdr(skb);
1256
1257         /* Drop reports with not link local source */
1258         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1259         if (addr_type != IPV6_ADDR_ANY &&
1260             !(addr_type&IPV6_ADDR_LINKLOCAL))
1261                 return -EINVAL;
1262
1263         idev = __in6_dev_get(skb->dev);
1264         if (idev == NULL)
1265                 return -ENODEV;
1266
1267         /*
1268          *      Cancel the timer for this group
1269          */
1270
1271         read_lock_bh(&idev->lock);
1272         for (ma = idev->mc_list; ma; ma=ma->next) {
1273                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1274                         spin_lock(&ma->mca_lock);
1275                         if (del_timer(&ma->mca_timer))
1276                                 atomic_dec(&ma->mca_refcnt);
1277                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1278                         spin_unlock(&ma->mca_lock);
1279                         break;
1280                 }
1281         }
1282         read_unlock_bh(&idev->lock);
1283         return 0;
1284 }
1285
1286 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1287         int gdeleted, int sdeleted)
1288 {
1289         switch (type) {
1290         case MLD2_MODE_IS_INCLUDE:
1291         case MLD2_MODE_IS_EXCLUDE:
1292                 if (gdeleted || sdeleted)
1293                         return 0;
1294                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1295                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1296                                 return 1;
1297                         /* don't include if this source is excluded
1298                          * in all filters
1299                          */
1300                         if (psf->sf_count[MCAST_INCLUDE])
1301                                 return type == MLD2_MODE_IS_INCLUDE;
1302                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1303                                 psf->sf_count[MCAST_EXCLUDE];
1304                 }
1305                 return 0;
1306         case MLD2_CHANGE_TO_INCLUDE:
1307                 if (gdeleted || sdeleted)
1308                         return 0;
1309                 return psf->sf_count[MCAST_INCLUDE] != 0;
1310         case MLD2_CHANGE_TO_EXCLUDE:
1311                 if (gdeleted || sdeleted)
1312                         return 0;
1313                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1314                     psf->sf_count[MCAST_INCLUDE])
1315                         return 0;
1316                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1317                         psf->sf_count[MCAST_EXCLUDE];
1318         case MLD2_ALLOW_NEW_SOURCES:
1319                 if (gdeleted || !psf->sf_crcount)
1320                         return 0;
1321                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1322         case MLD2_BLOCK_OLD_SOURCES:
1323                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1324                         return gdeleted || (psf->sf_crcount && sdeleted);
1325                 return psf->sf_crcount && !gdeleted && !sdeleted;
1326         }
1327         return 0;
1328 }
1329
1330 static int
1331 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1332 {
1333         struct ip6_sf_list *psf;
1334         int scount = 0;
1335
1336         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1337                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1338                         continue;
1339                 scount++;
1340         }
1341         return scount;
1342 }
1343
1344 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1345 {
1346         struct net_device *dev = idev->dev;
1347         struct net *net = dev_net(dev);
1348         struct sock *sk = net->ipv6.igmp_sk;
1349         struct sk_buff *skb;
1350         struct mld2_report *pmr;
1351         struct in6_addr addr_buf;
1352         const struct in6_addr *saddr;
1353         int hlen = LL_RESERVED_SPACE(dev);
1354         int tlen = dev->needed_tailroom;
1355         unsigned int size = mtu + hlen + tlen;
1356         int err;
1357         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1358                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1359                      IPV6_TLV_PADN, 0 };
1360
1361         /* we assume size > sizeof(ra) here */
1362         /* limit our allocations to order-0 page */
1363         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1364         skb = sock_alloc_send_skb(sk, size, 1, &err);
1365
1366         if (!skb)
1367                 return NULL;
1368
1369         skb_reserve(skb, hlen);
1370         skb_tailroom_reserve(skb, mtu, tlen);
1371
1372         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1373                 /* <draft-ietf-magma-mld-source-05.txt>:
1374                  * use unspecified address as the source address
1375                  * when a valid link-local address is not available.
1376                  */
1377                 saddr = &in6addr_any;
1378         } else
1379                 saddr = &addr_buf;
1380
1381         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1382
1383         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1384
1385         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1386         skb_put(skb, sizeof(*pmr));
1387         pmr = (struct mld2_report *)skb_transport_header(skb);
1388         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1389         pmr->mld2r_resv1 = 0;
1390         pmr->mld2r_cksum = 0;
1391         pmr->mld2r_resv2 = 0;
1392         pmr->mld2r_ngrec = 0;
1393         return skb;
1394 }
1395
1396 static void mld_sendpack(struct sk_buff *skb)
1397 {
1398         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1399         struct mld2_report *pmr =
1400                               (struct mld2_report *)skb_transport_header(skb);
1401         int payload_len, mldlen;
1402         struct inet6_dev *idev;
1403         struct net *net = dev_net(skb->dev);
1404         int err;
1405         struct flowi6 fl6;
1406         struct dst_entry *dst;
1407
1408         rcu_read_lock();
1409         idev = __in6_dev_get(skb->dev);
1410         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1411
1412         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1413         mldlen = skb->tail - skb->transport_header;
1414         pip6->payload_len = htons(payload_len);
1415
1416         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1417                                            IPPROTO_ICMPV6,
1418                                            csum_partial(skb_transport_header(skb),
1419                                                         mldlen, 0));
1420
1421         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1422
1423         if (!dst) {
1424                 err = -ENOMEM;
1425                 goto err_out;
1426         }
1427
1428         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1429                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1430                          skb->dev->ifindex);
1431
1432         dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1433         err = 0;
1434         if (IS_ERR(dst)) {
1435                 err = PTR_ERR(dst);
1436                 dst = NULL;
1437         }
1438         skb_dst_set(skb, dst);
1439         if (err)
1440                 goto err_out;
1441
1442         payload_len = skb->len;
1443
1444         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1445                       dst_output);
1446 out:
1447         if (!err) {
1448                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1449                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1450         } else {
1451                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1452         }
1453
1454         rcu_read_unlock();
1455         return;
1456
1457 err_out:
1458         kfree_skb(skb);
1459         goto out;
1460 }
1461
1462 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1463 {
1464         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1465 }
1466
1467 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1468         int type, struct mld2_grec **ppgr)
1469 {
1470         struct net_device *dev = pmc->idev->dev;
1471         struct mld2_report *pmr;
1472         struct mld2_grec *pgr;
1473
1474         if (!skb)
1475                 skb = mld_newpack(pmc->idev, dev->mtu);
1476         if (!skb)
1477                 return NULL;
1478         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1479         pgr->grec_type = type;
1480         pgr->grec_auxwords = 0;
1481         pgr->grec_nsrcs = 0;
1482         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1483         pmr = (struct mld2_report *)skb_transport_header(skb);
1484         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1485         *ppgr = pgr;
1486         return skb;
1487 }
1488
1489 #define AVAILABLE(skb)  ((skb) ? skb_availroom(skb) : 0)
1490
1491 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1492         int type, int gdeleted, int sdeleted)
1493 {
1494         struct inet6_dev *idev = pmc->idev;
1495         struct net_device *dev = idev->dev;
1496         struct mld2_report *pmr;
1497         struct mld2_grec *pgr = NULL;
1498         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1499         int scount, stotal, first, isquery, truncate;
1500
1501         if (pmc->mca_flags & MAF_NOREPORT)
1502                 return skb;
1503
1504         isquery = type == MLD2_MODE_IS_INCLUDE ||
1505                   type == MLD2_MODE_IS_EXCLUDE;
1506         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1507                     type == MLD2_CHANGE_TO_EXCLUDE;
1508
1509         stotal = scount = 0;
1510
1511         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1512
1513         if (!*psf_list)
1514                 goto empty_source;
1515
1516         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1517
1518         /* EX and TO_EX get a fresh packet, if needed */
1519         if (truncate) {
1520                 if (pmr && pmr->mld2r_ngrec &&
1521                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1522                         if (skb)
1523                                 mld_sendpack(skb);
1524                         skb = mld_newpack(idev, dev->mtu);
1525                 }
1526         }
1527         first = 1;
1528         psf_prev = NULL;
1529         for (psf=*psf_list; psf; psf=psf_next) {
1530                 struct in6_addr *psrc;
1531
1532                 psf_next = psf->sf_next;
1533
1534                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1535                         psf_prev = psf;
1536                         continue;
1537                 }
1538
1539                 /* clear marks on query responses */
1540                 if (isquery)
1541                         psf->sf_gsresp = 0;
1542
1543                 if (AVAILABLE(skb) < sizeof(*psrc) +
1544                     first*sizeof(struct mld2_grec)) {
1545                         if (truncate && !first)
1546                                 break;   /* truncate these */
1547                         if (pgr)
1548                                 pgr->grec_nsrcs = htons(scount);
1549                         if (skb)
1550                                 mld_sendpack(skb);
1551                         skb = mld_newpack(idev, dev->mtu);
1552                         first = 1;
1553                         scount = 0;
1554                 }
1555                 if (first) {
1556                         skb = add_grhead(skb, pmc, type, &pgr);
1557                         first = 0;
1558                 }
1559                 if (!skb)
1560                         return NULL;
1561                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1562                 *psrc = psf->sf_addr;
1563                 scount++; stotal++;
1564                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1565                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1566                         psf->sf_crcount--;
1567                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1568                                 if (psf_prev)
1569                                         psf_prev->sf_next = psf->sf_next;
1570                                 else
1571                                         *psf_list = psf->sf_next;
1572                                 kfree(psf);
1573                                 continue;
1574                         }
1575                 }
1576                 psf_prev = psf;
1577         }
1578
1579 empty_source:
1580         if (!stotal) {
1581                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1582                     type == MLD2_BLOCK_OLD_SOURCES)
1583                         return skb;
1584                 if (pmc->mca_crcount || isquery) {
1585                         /* make sure we have room for group header */
1586                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1587                                 mld_sendpack(skb);
1588                                 skb = NULL; /* add_grhead will get a new one */
1589                         }
1590                         skb = add_grhead(skb, pmc, type, &pgr);
1591                 }
1592         }
1593         if (pgr)
1594                 pgr->grec_nsrcs = htons(scount);
1595
1596         if (isquery)
1597                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1598         return skb;
1599 }
1600
1601 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1602 {
1603         struct sk_buff *skb = NULL;
1604         int type;
1605
1606         read_lock_bh(&idev->lock);
1607         if (!pmc) {
1608                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1609                         if (pmc->mca_flags & MAF_NOREPORT)
1610                                 continue;
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         } else {
1620                 spin_lock_bh(&pmc->mca_lock);
1621                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1622                         type = MLD2_MODE_IS_EXCLUDE;
1623                 else
1624                         type = MLD2_MODE_IS_INCLUDE;
1625                 skb = add_grec(skb, pmc, type, 0, 0);
1626                 spin_unlock_bh(&pmc->mca_lock);
1627         }
1628         read_unlock_bh(&idev->lock);
1629         if (skb)
1630                 mld_sendpack(skb);
1631 }
1632
1633 /*
1634  * remove zero-count source records from a source filter list
1635  */
1636 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1637 {
1638         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1639
1640         psf_prev = NULL;
1641         for (psf=*ppsf; psf; psf = psf_next) {
1642                 psf_next = psf->sf_next;
1643                 if (psf->sf_crcount == 0) {
1644                         if (psf_prev)
1645                                 psf_prev->sf_next = psf->sf_next;
1646                         else
1647                                 *ppsf = psf->sf_next;
1648                         kfree(psf);
1649                 } else
1650                         psf_prev = psf;
1651         }
1652 }
1653
1654 static void mld_send_cr(struct inet6_dev *idev)
1655 {
1656         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1657         struct sk_buff *skb = NULL;
1658         int type, dtype;
1659
1660         read_lock_bh(&idev->lock);
1661         spin_lock(&idev->mc_lock);
1662
1663         /* deleted MCA's */
1664         pmc_prev = NULL;
1665         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1666                 pmc_next = pmc->next;
1667                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1668                         type = MLD2_BLOCK_OLD_SOURCES;
1669                         dtype = MLD2_BLOCK_OLD_SOURCES;
1670                         skb = add_grec(skb, pmc, type, 1, 0);
1671                         skb = add_grec(skb, pmc, dtype, 1, 1);
1672                 }
1673                 if (pmc->mca_crcount) {
1674                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1675                                 type = MLD2_CHANGE_TO_INCLUDE;
1676                                 skb = add_grec(skb, pmc, type, 1, 0);
1677                         }
1678                         pmc->mca_crcount--;
1679                         if (pmc->mca_crcount == 0) {
1680                                 mld_clear_zeros(&pmc->mca_tomb);
1681                                 mld_clear_zeros(&pmc->mca_sources);
1682                         }
1683                 }
1684                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1685                     !pmc->mca_sources) {
1686                         if (pmc_prev)
1687                                 pmc_prev->next = pmc_next;
1688                         else
1689                                 idev->mc_tomb = pmc_next;
1690                         in6_dev_put(pmc->idev);
1691                         kfree(pmc);
1692                 } else
1693                         pmc_prev = pmc;
1694         }
1695         spin_unlock(&idev->mc_lock);
1696
1697         /* change recs */
1698         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1699                 spin_lock_bh(&pmc->mca_lock);
1700                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1701                         type = MLD2_BLOCK_OLD_SOURCES;
1702                         dtype = MLD2_ALLOW_NEW_SOURCES;
1703                 } else {
1704                         type = MLD2_ALLOW_NEW_SOURCES;
1705                         dtype = MLD2_BLOCK_OLD_SOURCES;
1706                 }
1707                 skb = add_grec(skb, pmc, type, 0, 0);
1708                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1709
1710                 /* filter mode changes */
1711                 if (pmc->mca_crcount) {
1712                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1713                                 type = MLD2_CHANGE_TO_EXCLUDE;
1714                         else
1715                                 type = MLD2_CHANGE_TO_INCLUDE;
1716                         skb = add_grec(skb, pmc, type, 0, 0);
1717                         pmc->mca_crcount--;
1718                 }
1719                 spin_unlock_bh(&pmc->mca_lock);
1720         }
1721         read_unlock_bh(&idev->lock);
1722         if (!skb)
1723                 return;
1724         (void) mld_sendpack(skb);
1725 }
1726
1727 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1728 {
1729         struct net *net = dev_net(dev);
1730         struct sock *sk = net->ipv6.igmp_sk;
1731         struct inet6_dev *idev;
1732         struct sk_buff *skb;
1733         struct mld_msg *hdr;
1734         const struct in6_addr *snd_addr, *saddr;
1735         struct in6_addr addr_buf;
1736         int hlen = LL_RESERVED_SPACE(dev);
1737         int tlen = dev->needed_tailroom;
1738         int err, len, payload_len, full_len;
1739         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1740                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1741                      IPV6_TLV_PADN, 0 };
1742         struct flowi6 fl6;
1743         struct dst_entry *dst;
1744
1745         if (type == ICMPV6_MGM_REDUCTION)
1746                 snd_addr = &in6addr_linklocal_allrouters;
1747         else
1748                 snd_addr = addr;
1749
1750         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1751         payload_len = len + sizeof(ra);
1752         full_len = sizeof(struct ipv6hdr) + payload_len;
1753
1754         rcu_read_lock();
1755         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1756                       IPSTATS_MIB_OUT, full_len);
1757         rcu_read_unlock();
1758
1759         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1760
1761         if (skb == NULL) {
1762                 rcu_read_lock();
1763                 IP6_INC_STATS(net, __in6_dev_get(dev),
1764                               IPSTATS_MIB_OUTDISCARDS);
1765                 rcu_read_unlock();
1766                 return;
1767         }
1768
1769         skb_reserve(skb, hlen);
1770
1771         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1772                 /* <draft-ietf-magma-mld-source-05.txt>:
1773                  * use unspecified address as the source address
1774                  * when a valid link-local address is not available.
1775                  */
1776                 saddr = &in6addr_any;
1777         } else
1778                 saddr = &addr_buf;
1779
1780         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1781
1782         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1783
1784         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1785         memset(hdr, 0, sizeof(struct mld_msg));
1786         hdr->mld_type = type;
1787         ipv6_addr_copy(&hdr->mld_mca, addr);
1788
1789         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1790                                          IPPROTO_ICMPV6,
1791                                          csum_partial(hdr, len, 0));
1792
1793         rcu_read_lock();
1794         idev = __in6_dev_get(skb->dev);
1795
1796         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1797         if (!dst) {
1798                 err = -ENOMEM;
1799                 goto err_out;
1800         }
1801
1802         icmpv6_flow_init(sk, &fl6, type,
1803                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1804                          skb->dev->ifindex);
1805
1806         dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1807         if (IS_ERR(dst)) {
1808                 err = PTR_ERR(dst);
1809                 goto err_out;
1810         }
1811
1812         skb_dst_set(skb, dst);
1813         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1814                       dst_output);
1815 out:
1816         if (!err) {
1817                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1818                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1819         } else
1820                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1821
1822         rcu_read_unlock();
1823         return;
1824
1825 err_out:
1826         kfree_skb(skb);
1827         goto out;
1828 }
1829
1830 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1831         const struct in6_addr *psfsrc)
1832 {
1833         struct ip6_sf_list *psf, *psf_prev;
1834         int rv = 0;
1835
1836         psf_prev = NULL;
1837         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1838                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1839                         break;
1840                 psf_prev = psf;
1841         }
1842         if (!psf || psf->sf_count[sfmode] == 0) {
1843                 /* source filter not found, or count wrong =>  bug */
1844                 return -ESRCH;
1845         }
1846         psf->sf_count[sfmode]--;
1847         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1848                 struct inet6_dev *idev = pmc->idev;
1849
1850                 /* no more filters for this source */
1851                 if (psf_prev)
1852                         psf_prev->sf_next = psf->sf_next;
1853                 else
1854                         pmc->mca_sources = psf->sf_next;
1855                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1856                     !MLD_V1_SEEN(idev)) {
1857                         psf->sf_crcount = idev->mc_qrv;
1858                         psf->sf_next = pmc->mca_tomb;
1859                         pmc->mca_tomb = psf;
1860                         rv = 1;
1861                 } else
1862                         kfree(psf);
1863         }
1864         return rv;
1865 }
1866
1867 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1868                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1869                           int delta)
1870 {
1871         struct ifmcaddr6 *pmc;
1872         int     changerec = 0;
1873         int     i, err;
1874
1875         if (!idev)
1876                 return -ENODEV;
1877         read_lock_bh(&idev->lock);
1878         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1879                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1880                         break;
1881         }
1882         if (!pmc) {
1883                 /* MCA not found?? bug */
1884                 read_unlock_bh(&idev->lock);
1885                 return -ESRCH;
1886         }
1887         spin_lock_bh(&pmc->mca_lock);
1888         sf_markstate(pmc);
1889         if (!delta) {
1890                 if (!pmc->mca_sfcount[sfmode]) {
1891                         spin_unlock_bh(&pmc->mca_lock);
1892                         read_unlock_bh(&idev->lock);
1893                         return -EINVAL;
1894                 }
1895                 pmc->mca_sfcount[sfmode]--;
1896         }
1897         err = 0;
1898         for (i=0; i<sfcount; i++) {
1899                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1900
1901                 changerec |= rv > 0;
1902                 if (!err && rv < 0)
1903                         err = rv;
1904         }
1905         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1906             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1907             pmc->mca_sfcount[MCAST_INCLUDE]) {
1908                 struct ip6_sf_list *psf;
1909
1910                 /* filter mode change */
1911                 pmc->mca_sfmode = MCAST_INCLUDE;
1912                 pmc->mca_crcount = idev->mc_qrv;
1913                 idev->mc_ifc_count = pmc->mca_crcount;
1914                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1915                         psf->sf_crcount = 0;
1916                 mld_ifc_event(pmc->idev);
1917         } else if (sf_setstate(pmc) || changerec)
1918                 mld_ifc_event(pmc->idev);
1919         spin_unlock_bh(&pmc->mca_lock);
1920         read_unlock_bh(&idev->lock);
1921         return err;
1922 }
1923
1924 /*
1925  * Add multicast single-source filter to the interface list
1926  */
1927 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1928         const struct in6_addr *psfsrc, int delta)
1929 {
1930         struct ip6_sf_list *psf, *psf_prev;
1931
1932         psf_prev = NULL;
1933         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1934                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1935                         break;
1936                 psf_prev = psf;
1937         }
1938         if (!psf) {
1939                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1940                 if (!psf)
1941                         return -ENOBUFS;
1942
1943                 psf->sf_addr = *psfsrc;
1944                 if (psf_prev) {
1945                         psf_prev->sf_next = psf;
1946                 } else
1947                         pmc->mca_sources = psf;
1948         }
1949         psf->sf_count[sfmode]++;
1950         return 0;
1951 }
1952
1953 static void sf_markstate(struct ifmcaddr6 *pmc)
1954 {
1955         struct ip6_sf_list *psf;
1956         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1957
1958         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1959                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1960                         psf->sf_oldin = mca_xcount ==
1961                                 psf->sf_count[MCAST_EXCLUDE] &&
1962                                 !psf->sf_count[MCAST_INCLUDE];
1963                 } else
1964                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1965 }
1966
1967 static int sf_setstate(struct ifmcaddr6 *pmc)
1968 {
1969         struct ip6_sf_list *psf, *dpsf;
1970         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1971         int qrv = pmc->idev->mc_qrv;
1972         int new_in, rv;
1973
1974         rv = 0;
1975         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1976                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1977                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1978                                 !psf->sf_count[MCAST_INCLUDE];
1979                 } else
1980                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1981                 if (new_in) {
1982                         if (!psf->sf_oldin) {
1983                                 struct ip6_sf_list *prev = NULL;
1984
1985                                 for (dpsf=pmc->mca_tomb; dpsf;
1986                                      dpsf=dpsf->sf_next) {
1987                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1988                                             &psf->sf_addr))
1989                                                 break;
1990                                         prev = dpsf;
1991                                 }
1992                                 if (dpsf) {
1993                                         if (prev)
1994                                                 prev->sf_next = dpsf->sf_next;
1995                                         else
1996                                                 pmc->mca_tomb = dpsf->sf_next;
1997                                         kfree(dpsf);
1998                                 }
1999                                 psf->sf_crcount = qrv;
2000                                 rv++;
2001                         }
2002                 } else if (psf->sf_oldin) {
2003                         psf->sf_crcount = 0;
2004                         /*
2005                          * add or update "delete" records if an active filter
2006                          * is now inactive
2007                          */
2008                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2009                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2010                                     &psf->sf_addr))
2011                                         break;
2012                         if (!dpsf) {
2013                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2014                                 if (!dpsf)
2015                                         continue;
2016                                 *dpsf = *psf;
2017                                 /* pmc->mca_lock held by callers */
2018                                 dpsf->sf_next = pmc->mca_tomb;
2019                                 pmc->mca_tomb = dpsf;
2020                         }
2021                         dpsf->sf_crcount = qrv;
2022                         rv++;
2023                 }
2024         }
2025         return rv;
2026 }
2027
2028 /*
2029  * Add multicast source filter list to the interface list
2030  */
2031 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2032                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2033                           int delta)
2034 {
2035         struct ifmcaddr6 *pmc;
2036         int     isexclude;
2037         int     i, err;
2038
2039         if (!idev)
2040                 return -ENODEV;
2041         read_lock_bh(&idev->lock);
2042         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2043                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2044                         break;
2045         }
2046         if (!pmc) {
2047                 /* MCA not found?? bug */
2048                 read_unlock_bh(&idev->lock);
2049                 return -ESRCH;
2050         }
2051         spin_lock_bh(&pmc->mca_lock);
2052
2053         sf_markstate(pmc);
2054         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2055         if (!delta)
2056                 pmc->mca_sfcount[sfmode]++;
2057         err = 0;
2058         for (i=0; i<sfcount; i++) {
2059                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2060                 if (err)
2061                         break;
2062         }
2063         if (err) {
2064                 int j;
2065
2066                 if (!delta)
2067                         pmc->mca_sfcount[sfmode]--;
2068                 for (j=0; j<i; j++)
2069                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2070         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2071                 struct ip6_sf_list *psf;
2072
2073                 /* filter mode change */
2074                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2075                         pmc->mca_sfmode = MCAST_EXCLUDE;
2076                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2077                         pmc->mca_sfmode = MCAST_INCLUDE;
2078                 /* else no filters; keep old mode for reports */
2079
2080                 pmc->mca_crcount = idev->mc_qrv;
2081                 idev->mc_ifc_count = pmc->mca_crcount;
2082                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2083                         psf->sf_crcount = 0;
2084                 mld_ifc_event(idev);
2085         } else if (sf_setstate(pmc))
2086                 mld_ifc_event(idev);
2087         spin_unlock_bh(&pmc->mca_lock);
2088         read_unlock_bh(&idev->lock);
2089         return err;
2090 }
2091
2092 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2093 {
2094         struct ip6_sf_list *psf, *nextpsf;
2095
2096         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2097                 nextpsf = psf->sf_next;
2098                 kfree(psf);
2099         }
2100         pmc->mca_tomb = NULL;
2101         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2102                 nextpsf = psf->sf_next;
2103                 kfree(psf);
2104         }
2105         pmc->mca_sources = NULL;
2106         pmc->mca_sfmode = MCAST_EXCLUDE;
2107         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2108         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2109 }
2110
2111
2112 static void igmp6_join_group(struct ifmcaddr6 *ma)
2113 {
2114         unsigned long delay;
2115
2116         if (ma->mca_flags & MAF_NOREPORT)
2117                 return;
2118
2119         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2120
2121         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2122
2123         spin_lock_bh(&ma->mca_lock);
2124         if (del_timer(&ma->mca_timer)) {
2125                 atomic_dec(&ma->mca_refcnt);
2126                 delay = ma->mca_timer.expires - jiffies;
2127         }
2128
2129         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2130                 atomic_inc(&ma->mca_refcnt);
2131         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2132         spin_unlock_bh(&ma->mca_lock);
2133 }
2134
2135 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2136                             struct inet6_dev *idev)
2137 {
2138         int err;
2139
2140         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2141          * so no other readers or writers of iml or its sflist
2142          */
2143         if (!iml->sflist) {
2144                 /* any-source empty exclude case */
2145                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2146         }
2147         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2148                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2149         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2150         iml->sflist = NULL;
2151         return err;
2152 }
2153
2154 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2155 {
2156         if (MLD_V1_SEEN(ma->idev)) {
2157                 if (ma->mca_flags & MAF_LAST_REPORTER)
2158                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2159                                 ICMPV6_MGM_REDUCTION);
2160         } else {
2161                 mld_add_delrec(ma->idev, ma);
2162                 mld_ifc_event(ma->idev);
2163         }
2164 }
2165
2166 static void mld_gq_timer_expire(unsigned long data)
2167 {
2168         struct inet6_dev *idev = (struct inet6_dev *)data;
2169
2170         idev->mc_gq_running = 0;
2171         mld_send_report(idev, NULL);
2172         in6_dev_put(idev);
2173 }
2174
2175 static void mld_ifc_timer_expire(unsigned long data)
2176 {
2177         struct inet6_dev *idev = (struct inet6_dev *)data;
2178
2179         mld_send_cr(idev);
2180         if (idev->mc_ifc_count) {
2181                 idev->mc_ifc_count--;
2182                 if (idev->mc_ifc_count)
2183                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2184         }
2185         in6_dev_put(idev);
2186 }
2187
2188 static void mld_ifc_event(struct inet6_dev *idev)
2189 {
2190         if (MLD_V1_SEEN(idev))
2191                 return;
2192         idev->mc_ifc_count = idev->mc_qrv;
2193         mld_ifc_start_timer(idev, 1);
2194 }
2195
2196
2197 static void igmp6_timer_handler(unsigned long data)
2198 {
2199         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2200
2201         if (MLD_V1_SEEN(ma->idev))
2202                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2203         else
2204                 mld_send_report(ma->idev, ma);
2205
2206         spin_lock(&ma->mca_lock);
2207         ma->mca_flags |=  MAF_LAST_REPORTER;
2208         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2209         spin_unlock(&ma->mca_lock);
2210         ma_put(ma);
2211 }
2212
2213 /* Device changing type */
2214
2215 void ipv6_mc_unmap(struct inet6_dev *idev)
2216 {
2217         struct ifmcaddr6 *i;
2218
2219         /* Install multicast list, except for all-nodes (already installed) */
2220
2221         read_lock_bh(&idev->lock);
2222         for (i = idev->mc_list; i; i = i->next)
2223                 igmp6_group_dropped(i);
2224         read_unlock_bh(&idev->lock);
2225 }
2226
2227 void ipv6_mc_remap(struct inet6_dev *idev)
2228 {
2229         ipv6_mc_up(idev);
2230 }
2231
2232 /* Device going down */
2233
2234 void ipv6_mc_down(struct inet6_dev *idev)
2235 {
2236         struct ifmcaddr6 *i;
2237
2238         /* Withdraw multicast list */
2239
2240         read_lock_bh(&idev->lock);
2241
2242         for (i = idev->mc_list; i; i=i->next)
2243                 igmp6_group_dropped(i);
2244
2245         /* Should stop timer after group drop. or we will
2246          * start timer again in mld_ifc_event()
2247          */
2248         idev->mc_ifc_count = 0;
2249         if (del_timer(&idev->mc_ifc_timer))
2250                 __in6_dev_put(idev);
2251         idev->mc_gq_running = 0;
2252         if (del_timer(&idev->mc_gq_timer))
2253                 __in6_dev_put(idev);
2254         read_unlock_bh(&idev->lock);
2255 }
2256
2257
2258 /* Device going up */
2259
2260 void ipv6_mc_up(struct inet6_dev *idev)
2261 {
2262         struct ifmcaddr6 *i;
2263
2264         /* Install multicast list, except for all-nodes (already installed) */
2265
2266         read_lock_bh(&idev->lock);
2267         for (i = idev->mc_list; i; i = i->next) {
2268                 mld_del_delrec(idev, i);
2269                 igmp6_group_added(i);
2270         }
2271         read_unlock_bh(&idev->lock);
2272 }
2273
2274 /* IPv6 device initialization. */
2275
2276 void ipv6_mc_init_dev(struct inet6_dev *idev)
2277 {
2278         write_lock_bh(&idev->lock);
2279         spin_lock_init(&idev->mc_lock);
2280         idev->mc_gq_running = 0;
2281         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2282                         (unsigned long)idev);
2283         idev->mc_tomb = NULL;
2284         idev->mc_ifc_count = 0;
2285         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2286                         (unsigned long)idev);
2287         idev->mc_qrv = MLD_QRV_DEFAULT;
2288         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2289         idev->mc_v1_seen = 0;
2290         write_unlock_bh(&idev->lock);
2291 }
2292
2293 /*
2294  *      Device is about to be destroyed: clean up.
2295  */
2296
2297 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2298 {
2299         struct ifmcaddr6 *i;
2300
2301         /* Deactivate timers */
2302         ipv6_mc_down(idev);
2303         mld_clear_delrec(idev);
2304
2305         /* Delete all-nodes address. */
2306         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2307          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2308          * fail.
2309          */
2310         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2311
2312         if (idev->cnf.forwarding)
2313                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2314
2315         write_lock_bh(&idev->lock);
2316         while ((i = idev->mc_list) != NULL) {
2317                 idev->mc_list = i->next;
2318
2319                 write_unlock_bh(&idev->lock);
2320                 ma_put(i);
2321                 write_lock_bh(&idev->lock);
2322         }
2323         write_unlock_bh(&idev->lock);
2324 }
2325
2326 #ifdef CONFIG_PROC_FS
2327 struct igmp6_mc_iter_state {
2328         struct seq_net_private p;
2329         struct net_device *dev;
2330         struct inet6_dev *idev;
2331 };
2332
2333 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2334
2335 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2336 {
2337         struct ifmcaddr6 *im = NULL;
2338         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2339         struct net *net = seq_file_net(seq);
2340
2341         state->idev = NULL;
2342         for_each_netdev_rcu(net, state->dev) {
2343                 struct inet6_dev *idev;
2344                 idev = __in6_dev_get(state->dev);
2345                 if (!idev)
2346                         continue;
2347                 read_lock_bh(&idev->lock);
2348                 im = idev->mc_list;
2349                 if (im) {
2350                         state->idev = idev;
2351                         break;
2352                 }
2353                 read_unlock_bh(&idev->lock);
2354         }
2355         return im;
2356 }
2357
2358 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2359 {
2360         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2361
2362         im = im->next;
2363         while (!im) {
2364                 if (likely(state->idev != NULL))
2365                         read_unlock_bh(&state->idev->lock);
2366
2367                 state->dev = next_net_device_rcu(state->dev);
2368                 if (!state->dev) {
2369                         state->idev = NULL;
2370                         break;
2371                 }
2372                 state->idev = __in6_dev_get(state->dev);
2373                 if (!state->idev)
2374                         continue;
2375                 read_lock_bh(&state->idev->lock);
2376                 im = state->idev->mc_list;
2377         }
2378         return im;
2379 }
2380
2381 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2382 {
2383         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2384         if (im)
2385                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2386                         --pos;
2387         return pos ? NULL : im;
2388 }
2389
2390 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2391         __acquires(RCU)
2392 {
2393         rcu_read_lock();
2394         return igmp6_mc_get_idx(seq, *pos);
2395 }
2396
2397 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2398 {
2399         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2400
2401         ++*pos;
2402         return im;
2403 }
2404
2405 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2406         __releases(RCU)
2407 {
2408         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2409
2410         if (likely(state->idev != NULL)) {
2411                 read_unlock_bh(&state->idev->lock);
2412                 state->idev = NULL;
2413         }
2414         state->dev = NULL;
2415         rcu_read_unlock();
2416 }
2417
2418 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2419 {
2420         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2421         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2422
2423         seq_printf(seq,
2424                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2425                    state->dev->ifindex, state->dev->name,
2426                    &im->mca_addr,
2427                    im->mca_users, im->mca_flags,
2428                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2429                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2430         return 0;
2431 }
2432
2433 static const struct seq_operations igmp6_mc_seq_ops = {
2434         .start  =       igmp6_mc_seq_start,
2435         .next   =       igmp6_mc_seq_next,
2436         .stop   =       igmp6_mc_seq_stop,
2437         .show   =       igmp6_mc_seq_show,
2438 };
2439
2440 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2441 {
2442         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2443                             sizeof(struct igmp6_mc_iter_state));
2444 }
2445
2446 static const struct file_operations igmp6_mc_seq_fops = {
2447         .owner          =       THIS_MODULE,
2448         .open           =       igmp6_mc_seq_open,
2449         .read           =       seq_read,
2450         .llseek         =       seq_lseek,
2451         .release        =       seq_release_net,
2452 };
2453
2454 struct igmp6_mcf_iter_state {
2455         struct seq_net_private p;
2456         struct net_device *dev;
2457         struct inet6_dev *idev;
2458         struct ifmcaddr6 *im;
2459 };
2460
2461 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2462
2463 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2464 {
2465         struct ip6_sf_list *psf = NULL;
2466         struct ifmcaddr6 *im = NULL;
2467         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2468         struct net *net = seq_file_net(seq);
2469
2470         state->idev = NULL;
2471         state->im = NULL;
2472         for_each_netdev_rcu(net, state->dev) {
2473                 struct inet6_dev *idev;
2474                 idev = __in6_dev_get(state->dev);
2475                 if (unlikely(idev == NULL))
2476                         continue;
2477                 read_lock_bh(&idev->lock);
2478                 im = idev->mc_list;
2479                 if (likely(im != NULL)) {
2480                         spin_lock_bh(&im->mca_lock);
2481                         psf = im->mca_sources;
2482                         if (likely(psf != NULL)) {
2483                                 state->im = im;
2484                                 state->idev = idev;
2485                                 break;
2486                         }
2487                         spin_unlock_bh(&im->mca_lock);
2488                 }
2489                 read_unlock_bh(&idev->lock);
2490         }
2491         return psf;
2492 }
2493
2494 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2495 {
2496         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2497
2498         psf = psf->sf_next;
2499         while (!psf) {
2500                 spin_unlock_bh(&state->im->mca_lock);
2501                 state->im = state->im->next;
2502                 while (!state->im) {
2503                         if (likely(state->idev != NULL))
2504                                 read_unlock_bh(&state->idev->lock);
2505
2506                         state->dev = next_net_device_rcu(state->dev);
2507                         if (!state->dev) {
2508                                 state->idev = NULL;
2509                                 goto out;
2510                         }
2511                         state->idev = __in6_dev_get(state->dev);
2512                         if (!state->idev)
2513                                 continue;
2514                         read_lock_bh(&state->idev->lock);
2515                         state->im = state->idev->mc_list;
2516                 }
2517                 if (!state->im)
2518                         break;
2519                 spin_lock_bh(&state->im->mca_lock);
2520                 psf = state->im->mca_sources;
2521         }
2522 out:
2523         return psf;
2524 }
2525
2526 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2527 {
2528         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2529         if (psf)
2530                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2531                         --pos;
2532         return pos ? NULL : psf;
2533 }
2534
2535 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2536         __acquires(RCU)
2537 {
2538         rcu_read_lock();
2539         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2540 }
2541
2542 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2543 {
2544         struct ip6_sf_list *psf;
2545         if (v == SEQ_START_TOKEN)
2546                 psf = igmp6_mcf_get_first(seq);
2547         else
2548                 psf = igmp6_mcf_get_next(seq, v);
2549         ++*pos;
2550         return psf;
2551 }
2552
2553 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2554         __releases(RCU)
2555 {
2556         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2557         if (likely(state->im != NULL)) {
2558                 spin_unlock_bh(&state->im->mca_lock);
2559                 state->im = NULL;
2560         }
2561         if (likely(state->idev != NULL)) {
2562                 read_unlock_bh(&state->idev->lock);
2563                 state->idev = NULL;
2564         }
2565         state->dev = NULL;
2566         rcu_read_unlock();
2567 }
2568
2569 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2570 {
2571         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2572         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2573
2574         if (v == SEQ_START_TOKEN) {
2575                 seq_printf(seq,
2576                            "%3s %6s "
2577                            "%32s %32s %6s %6s\n", "Idx",
2578                            "Device", "Multicast Address",
2579                            "Source Address", "INC", "EXC");
2580         } else {
2581                 seq_printf(seq,
2582                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2583                            state->dev->ifindex, state->dev->name,
2584                            &state->im->mca_addr,
2585                            &psf->sf_addr,
2586                            psf->sf_count[MCAST_INCLUDE],
2587                            psf->sf_count[MCAST_EXCLUDE]);
2588         }
2589         return 0;
2590 }
2591
2592 static const struct seq_operations igmp6_mcf_seq_ops = {
2593         .start  =       igmp6_mcf_seq_start,
2594         .next   =       igmp6_mcf_seq_next,
2595         .stop   =       igmp6_mcf_seq_stop,
2596         .show   =       igmp6_mcf_seq_show,
2597 };
2598
2599 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2600 {
2601         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2602                             sizeof(struct igmp6_mcf_iter_state));
2603 }
2604
2605 static const struct file_operations igmp6_mcf_seq_fops = {
2606         .owner          =       THIS_MODULE,
2607         .open           =       igmp6_mcf_seq_open,
2608         .read           =       seq_read,
2609         .llseek         =       seq_lseek,
2610         .release        =       seq_release_net,
2611 };
2612
2613 static int __net_init igmp6_proc_init(struct net *net)
2614 {
2615         int err;
2616
2617         err = -ENOMEM;
2618         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2619                 goto out;
2620         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2621                                   &igmp6_mcf_seq_fops))
2622                 goto out_proc_net_igmp6;
2623
2624         err = 0;
2625 out:
2626         return err;
2627
2628 out_proc_net_igmp6:
2629         proc_net_remove(net, "igmp6");
2630         goto out;
2631 }
2632
2633 static void __net_exit igmp6_proc_exit(struct net *net)
2634 {
2635         proc_net_remove(net, "mcfilter6");
2636         proc_net_remove(net, "igmp6");
2637 }
2638 #else
2639 static inline int igmp6_proc_init(struct net *net)
2640 {
2641         return 0;
2642 }
2643 static inline void igmp6_proc_exit(struct net *net)
2644 {
2645 }
2646 #endif
2647
2648 static int __net_init igmp6_net_init(struct net *net)
2649 {
2650         int err;
2651
2652         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2653                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2654         if (err < 0) {
2655                 printk(KERN_ERR
2656                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2657                        err);
2658                 goto out;
2659         }
2660
2661         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2662
2663         err = igmp6_proc_init(net);
2664         if (err)
2665                 goto out_sock_create;
2666 out:
2667         return err;
2668
2669 out_sock_create:
2670         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2671         goto out;
2672 }
2673
2674 static void __net_exit igmp6_net_exit(struct net *net)
2675 {
2676         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2677         igmp6_proc_exit(net);
2678 }
2679
2680 static struct pernet_operations igmp6_net_ops = {
2681         .init = igmp6_net_init,
2682         .exit = igmp6_net_exit,
2683 };
2684
2685 int __init igmp6_init(void)
2686 {
2687         return register_pernet_subsys(&igmp6_net_ops);
2688 }
2689
2690 void igmp6_cleanup(void)
2691 {
2692         unregister_pernet_subsys(&igmp6_net_ops);
2693 }