net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <net/mld.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/net_namespace.h>
  53 #include <net/sock.h>
  54 #include <net/snmp.h>
  55
  56 #include <net/ipv6.h>
  57 #include <net/protocol.h>
  58 #include <net/if_inet6.h>
  59 #include <net/ndisc.h>
  60 #include <net/addrconf.h>
  61 #include <net/ip6_route.h>
  62 #include <net/inet_common.h>
  63
  64 #include <net/ip6_checksum.h>
  65
  66 /* Set to 3 to get tracing... */
  67 #define MCAST_DEBUG 2
  68
  69 #if MCAST_DEBUG >= 3
  70 #define MDBG(x) printk x
  71 #else
  72 #define MDBG(x)
  73 #endif
  74
  75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  77         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  80 };
  81
  82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84 /* Big mc list lock for all the sockets */
  85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  86
  87 static void igmp6_join_group(struct ifmcaddr6 *ma);
  88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89 static void igmp6_timer_handler(unsigned long data);
  90
  91 static void mld_gq_timer_expire(unsigned long data);
  92 static void mld_ifc_timer_expire(unsigned long data);
  93 static void mld_ifc_event(struct inet6_dev *idev);
  94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  96 static void mld_clear_delrec(struct inet6_dev *idev);
  97 static int sf_setstate(struct ifmcaddr6 *pmc);
  98 static void sf_markstate(struct ifmcaddr6 *pmc);
  99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 101                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 102                           int delta);
 103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 104                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 105                           int delta);
 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 107                             struct inet6_dev *idev);
 108
 109
 110 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 111 #define MLD_QRV_DEFAULT         2
 112
 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 114                 (idev)->cnf.force_mld_version == 1 || \
 115                 ((idev)->mc_v1_seen && \
 116                 time_before(jiffies, (idev)->mc_v1_seen)))
 117
 118 #define IPV6_MLD_MAX_MSF        64
 119
 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 121
 122 /*
 123  *      socket join on multicast group
 124  */
 125
 126 #define for_each_pmc_rcu(np, pmc)                               \
 127         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 128              pmc != NULL;                                       \
 129              pmc = rcu_dereference(pmc->next))
 130
 131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 132 {
 133         struct net_device *dev = NULL;
 134         struct ipv6_mc_socklist *mc_lst;
 135         struct ipv6_pinfo *np = inet6_sk(sk);
 136         struct net *net = sock_net(sk);
 137         int err;
 138
 139         if (!ipv6_addr_is_multicast(addr))
 140                 return -EINVAL;
 141
 142         rcu_read_lock();
 143         for_each_pmc_rcu(np, mc_lst) {
 144                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 145                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 146                         rcu_read_unlock();
 147                         return -EADDRINUSE;
 148                 }
 149         }
 150         rcu_read_unlock();
 151
 152         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 153
 154         if (mc_lst == NULL)
 155                 return -ENOMEM;
 156
 157         mc_lst->next = NULL;
 158         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         if (mc->mca_flags & MAF_NOREPORT)
 695                 goto done;
 696         spin_unlock_bh(&mc->mca_lock);
 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 done:
 705         ip6_mc_clear_src(mc);
 706         spin_unlock_bh(&mc->mca_lock);
 707 }
 708
 709 /*
 710  * deleted ifmcaddr6 manipulation
 711  */
 712 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 713 {
 714         struct ifmcaddr6 *pmc;
 715
 716         /* this is an "ifmcaddr6" for convenience; only the fields below
 717          * are actually used. In particular, the refcnt and users are not
 718          * used for management of the delete list. Using the same structure
 719          * for deleted items allows change reports to use common code with
 720          * non-deleted or query-response MCA's.
 721          */
 722         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 723         if (!pmc)
 724                 return;
 725
 726         spin_lock_bh(&im->mca_lock);
 727         spin_lock_init(&pmc->mca_lock);
 728         pmc->idev = im->idev;
 729         in6_dev_hold(idev);
 730         pmc->mca_addr = im->mca_addr;
 731         pmc->mca_crcount = idev->mc_qrv;
 732         pmc->mca_sfmode = im->mca_sfmode;
 733         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 734                 struct ip6_sf_list *psf;
 735
 736                 pmc->mca_tomb = im->mca_tomb;
 737                 pmc->mca_sources = im->mca_sources;
 738                 im->mca_tomb = im->mca_sources = NULL;
 739                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 740                         psf->sf_crcount = pmc->mca_crcount;
 741         }
 742         spin_unlock_bh(&im->mca_lock);
 743
 744         spin_lock_bh(&idev->mc_lock);
 745         pmc->next = idev->mc_tomb;
 746         idev->mc_tomb = pmc;
 747         spin_unlock_bh(&idev->mc_lock);
 748 }
 749
 750 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 751 {
 752         struct ifmcaddr6 *pmc, *pmc_prev;
 753         struct ip6_sf_list *psf, *psf_next;
 754
 755         spin_lock_bh(&idev->mc_lock);
 756         pmc_prev = NULL;
 757         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 758                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 759                         break;
 760                 pmc_prev = pmc;
 761         }
 762         if (pmc) {
 763                 if (pmc_prev)
 764                         pmc_prev->next = pmc->next;
 765                 else
 766                         idev->mc_tomb = pmc->next;
 767         }
 768         spin_unlock_bh(&idev->mc_lock);
 769
 770         if (pmc) {
 771                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 772                         psf_next = psf->sf_next;
 773                         kfree(psf);
 774                 }
 775                 in6_dev_put(pmc->idev);
 776                 kfree(pmc);
 777         }
 778 }
 779
 780 static void mld_clear_delrec(struct inet6_dev *idev)
 781 {
 782         struct ifmcaddr6 *pmc, *nextpmc;
 783
 784         spin_lock_bh(&idev->mc_lock);
 785         pmc = idev->mc_tomb;
 786         idev->mc_tomb = NULL;
 787         spin_unlock_bh(&idev->mc_lock);
 788
 789         for (; pmc; pmc = nextpmc) {
 790                 nextpmc = pmc->next;
 791                 ip6_mc_clear_src(pmc);
 792                 in6_dev_put(pmc->idev);
 793                 kfree(pmc);
 794         }
 795
 796         /* clear dead sources, too */
 797         read_lock_bh(&idev->lock);
 798         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 799                 struct ip6_sf_list *psf, *psf_next;
 800
 801                 spin_lock_bh(&pmc->mca_lock);
 802                 psf = pmc->mca_tomb;
 803                 pmc->mca_tomb = NULL;
 804                 spin_unlock_bh(&pmc->mca_lock);
 805                 for (; psf; psf=psf_next) {
 806                         psf_next = psf->sf_next;
 807                         kfree(psf);
 808                 }
 809         }
 810         read_unlock_bh(&idev->lock);
 811 }
 812
 813
 814 /*
 815  *      device multicast group inc (add if not found)
 816  */
 817 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 818 {
 819         struct ifmcaddr6 *mc;
 820         struct inet6_dev *idev;
 821
 822         /* we need to take a reference on idev */
 823         idev = in6_dev_get(dev);
 824
 825         if (idev == NULL)
 826                 return -EINVAL;
 827
 828         write_lock_bh(&idev->lock);
 829         if (idev->dead) {
 830                 write_unlock_bh(&idev->lock);
 831                 in6_dev_put(idev);
 832                 return -ENODEV;
 833         }
 834
 835         for (mc = idev->mc_list; mc; mc = mc->next) {
 836                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 837                         mc->mca_users++;
 838                         write_unlock_bh(&idev->lock);
 839                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 840                                 NULL, 0);
 841                         in6_dev_put(idev);
 842                         return 0;
 843                 }
 844         }
 845
 846         /*
 847          *      not found: create a new one.
 848          */
 849
 850         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 851
 852         if (mc == NULL) {
 853                 write_unlock_bh(&idev->lock);
 854                 in6_dev_put(idev);
 855                 return -ENOMEM;
 856         }
 857
 858         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 859
 860         ipv6_addr_copy(&mc->mca_addr, addr);
 861         mc->idev = idev; /* (reference taken) */
 862         mc->mca_users = 1;
 863         /* mca_stamp should be updated upon changes */
 864         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 865         atomic_set(&mc->mca_refcnt, 2);
 866         spin_lock_init(&mc->mca_lock);
 867
 868         /* initial mode is (EX, empty) */
 869         mc->mca_sfmode = MCAST_EXCLUDE;
 870         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 871
 872         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 873             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 874                 mc->mca_flags |= MAF_NOREPORT;
 875
 876         mc->next = idev->mc_list;
 877         idev->mc_list = mc;
 878         write_unlock_bh(&idev->lock);
 879
 880         mld_del_delrec(idev, &mc->mca_addr);
 881         igmp6_group_added(mc);
 882         ma_put(mc);
 883         return 0;
 884 }
 885
 886 /*
 887  *      device multicast group del
 888  */
 889 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 890 {
 891         struct ifmcaddr6 *ma, **map;
 892
 893         write_lock_bh(&idev->lock);
 894         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 895                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 896                         if (--ma->mca_users == 0) {
 897                                 *map = ma->next;
 898                                 write_unlock_bh(&idev->lock);
 899
 900                                 igmp6_group_dropped(ma);
 901
 902                                 ma_put(ma);
 903                                 return 0;
 904                         }
 905                         write_unlock_bh(&idev->lock);
 906                         return 0;
 907                 }
 908         }
 909         write_unlock_bh(&idev->lock);
 910
 911         return -ENOENT;
 912 }
 913
 914 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 915 {
 916         struct inet6_dev *idev;
 917         int err;
 918
 919         rcu_read_lock();
 920
 921         idev = __in6_dev_get(dev);
 922         if (!idev)
 923                 err = -ENODEV;
 924         else
 925                 err = __ipv6_dev_mc_dec(idev, addr);
 926
 927         rcu_read_unlock();
 928         return err;
 929 }
 930
 931 /*
 932  * identify MLD packets for MLD filter exceptions
 933  */
 934 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 935 {
 936         struct icmp6hdr *pic;
 937
 938         if (nexthdr != IPPROTO_ICMPV6)
 939                 return 0;
 940
 941         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 942                 return 0;
 943
 944         pic = icmp6_hdr(skb);
 945
 946         switch (pic->icmp6_type) {
 947         case ICMPV6_MGM_QUERY:
 948         case ICMPV6_MGM_REPORT:
 949         case ICMPV6_MGM_REDUCTION:
 950         case ICMPV6_MLD2_REPORT:
 951                 return 1;
 952         default:
 953                 break;
 954         }
 955         return 0;
 956 }
 957
 958 /*
 959  *      check if the interface/address pair is valid
 960  */
 961 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 962                         const struct in6_addr *src_addr)
 963 {
 964         struct inet6_dev *idev;
 965         struct ifmcaddr6 *mc;
 966         int rv = 0;
 967
 968         rcu_read_lock();
 969         idev = __in6_dev_get(dev);
 970         if (idev) {
 971                 read_lock_bh(&idev->lock);
 972                 for (mc = idev->mc_list; mc; mc=mc->next) {
 973                         if (ipv6_addr_equal(&mc->mca_addr, group))
 974                                 break;
 975                 }
 976                 if (mc) {
 977                         if (src_addr && !ipv6_addr_any(src_addr)) {
 978                                 struct ip6_sf_list *psf;
 979
 980                                 spin_lock_bh(&mc->mca_lock);
 981                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 982                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 983                                                 break;
 984                                 }
 985                                 if (psf)
 986                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 987                                                 psf->sf_count[MCAST_EXCLUDE] !=
 988                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 989                                 else
 990                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 991                                 spin_unlock_bh(&mc->mca_lock);
 992                         } else
 993                                 rv = 1; /* don't filter unspecified source */
 994                 }
 995                 read_unlock_bh(&idev->lock);
 996         }
 997         rcu_read_unlock();
 998         return rv;
 999 }
1000
1001 static void mld_gq_start_timer(struct inet6_dev *idev)
1002 {
1003         int tv = net_random() % idev->mc_maxdelay;
1004
1005         idev->mc_gq_running = 1;
1006         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1007                 in6_dev_hold(idev);
1008 }
1009
1010 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1011 {
1012         int tv = net_random() % delay;
1013
1014         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1015                 in6_dev_hold(idev);
1016 }
1017
1018 /*
1019  *      IGMP handling (alias multicast ICMPv6 messages)
1020  */
1021
1022 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1023 {
1024         unsigned long delay = resptime;
1025
1026         /* Do not start timer for these addresses */
1027         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1028             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1029                 return;
1030
1031         if (del_timer(&ma->mca_timer)) {
1032                 atomic_dec(&ma->mca_refcnt);
1033                 delay = ma->mca_timer.expires - jiffies;
1034         }
1035
1036         if (delay >= resptime) {
1037                 if (resptime)
1038                         delay = net_random() % resptime;
1039                 else
1040                         delay = 1;
1041         }
1042         ma->mca_timer.expires = jiffies + delay;
1043         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1044                 atomic_inc(&ma->mca_refcnt);
1045         ma->mca_flags |= MAF_TIMER_RUNNING;
1046 }
1047
1048 /* mark EXCLUDE-mode sources */
1049 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1050         const struct in6_addr *srcs)
1051 {
1052         struct ip6_sf_list *psf;
1053         int i, scount;
1054
1055         scount = 0;
1056         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1057                 if (scount == nsrcs)
1058                         break;
1059                 for (i=0; i<nsrcs; i++) {
1060                         /* skip inactive filters */
1061                         if (psf->sf_count[MCAST_INCLUDE] ||
1062                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1063                             psf->sf_count[MCAST_EXCLUDE])
1064                                 continue;
1065                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1066                                 scount++;
1067                                 break;
1068                         }
1069                 }
1070         }
1071         pmc->mca_flags &= ~MAF_GSQUERY;
1072         if (scount == nsrcs)    /* all sources excluded */
1073                 return 0;
1074         return 1;
1075 }
1076
1077 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1078         const struct in6_addr *srcs)
1079 {
1080         struct ip6_sf_list *psf;
1081         int i, scount;
1082
1083         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1084                 return mld_xmarksources(pmc, nsrcs, srcs);
1085
1086         /* mark INCLUDE-mode sources */
1087
1088         scount = 0;
1089         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1090                 if (scount == nsrcs)
1091                         break;
1092                 for (i=0; i<nsrcs; i++) {
1093                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1094                                 psf->sf_gsresp = 1;
1095                                 scount++;
1096                                 break;
1097                         }
1098                 }
1099         }
1100         if (!scount) {
1101                 pmc->mca_flags &= ~MAF_GSQUERY;
1102                 return 0;
1103         }
1104         pmc->mca_flags |= MAF_GSQUERY;
1105         return 1;
1106 }
1107
1108 /* called with rcu_read_lock() */
1109 int igmp6_event_query(struct sk_buff *skb)
1110 {
1111         struct mld2_query *mlh2 = NULL;
1112         struct ifmcaddr6 *ma;
1113         const struct in6_addr *group;
1114         unsigned long max_delay;
1115         struct inet6_dev *idev;
1116         struct mld_msg *mld;
1117         int group_type;
1118         int mark = 0;
1119         int len;
1120
1121         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1122                 return -EINVAL;
1123
1124         /* compute payload length excluding extension headers */
1125         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1126         len -= skb_network_header_len(skb);
1127
1128         /* Drop queries with not link local source */
1129         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1130                 return -EINVAL;
1131
1132         idev = __in6_dev_get(skb->dev);
1133
1134         if (idev == NULL)
1135                 return 0;
1136
1137         mld = (struct mld_msg *)icmp6_hdr(skb);
1138         group = &mld->mld_mca;
1139         group_type = ipv6_addr_type(group);
1140
1141         if (group_type != IPV6_ADDR_ANY &&
1142             !(group_type&IPV6_ADDR_MULTICAST))
1143                 return -EINVAL;
1144
1145         if (len == 24) {
1146                 int switchback;
1147                 /* MLDv1 router present */
1148
1149                 /* Translate milliseconds to jiffies */
1150                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1151
1152                 switchback = (idev->mc_qrv + 1) * max_delay;
1153                 idev->mc_v1_seen = jiffies + switchback;
1154
1155                 /* cancel the interface change timer */
1156                 idev->mc_ifc_count = 0;
1157                 if (del_timer(&idev->mc_ifc_timer))
1158                         __in6_dev_put(idev);
1159                 /* clear deleted report items */
1160                 mld_clear_delrec(idev);
1161         } else if (len >= 28) {
1162                 int srcs_offset = sizeof(struct mld2_query) -
1163                                   sizeof(struct icmp6hdr);
1164                 if (!pskb_may_pull(skb, srcs_offset))
1165                         return -EINVAL;
1166
1167                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1168                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1169                 if (!max_delay)
1170                         max_delay = 1;
1171                 idev->mc_maxdelay = max_delay;
1172                 if (mlh2->mld2q_qrv)
1173                         idev->mc_qrv = mlh2->mld2q_qrv;
1174                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1175                         if (mlh2->mld2q_nsrcs)
1176                                 return -EINVAL; /* no sources allowed */
1177
1178                         mld_gq_start_timer(idev);
1179                         return 0;
1180                 }
1181                 /* mark sources to include, if group & source-specific */
1182                 if (mlh2->mld2q_nsrcs != 0) {
1183                         if (!pskb_may_pull(skb, srcs_offset +
1184                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1185                                 return -EINVAL;
1186
1187                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1188                         mark = 1;
1189                 }
1190         } else
1191                 return -EINVAL;
1192
1193         read_lock_bh(&idev->lock);
1194         if (group_type == IPV6_ADDR_ANY) {
1195                 for (ma = idev->mc_list; ma; ma=ma->next) {
1196                         spin_lock_bh(&ma->mca_lock);
1197                         igmp6_group_queried(ma, max_delay);
1198                         spin_unlock_bh(&ma->mca_lock);
1199                 }
1200         } else {
1201                 for (ma = idev->mc_list; ma; ma=ma->next) {
1202                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1203                                 continue;
1204                         spin_lock_bh(&ma->mca_lock);
1205                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1206                                 /* gsquery <- gsquery && mark */
1207                                 if (!mark)
1208                                         ma->mca_flags &= ~MAF_GSQUERY;
1209                         } else {
1210                                 /* gsquery <- mark */
1211                                 if (mark)
1212                                         ma->mca_flags |= MAF_GSQUERY;
1213                                 else
1214                                         ma->mca_flags &= ~MAF_GSQUERY;
1215                         }
1216                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1217                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1218                                 igmp6_group_queried(ma, max_delay);
1219                         spin_unlock_bh(&ma->mca_lock);
1220                         break;
1221                 }
1222         }
1223         read_unlock_bh(&idev->lock);
1224
1225         return 0;
1226 }
1227
1228 /* called with rcu_read_lock() */
1229 int igmp6_event_report(struct sk_buff *skb)
1230 {
1231         struct ifmcaddr6 *ma;
1232         struct inet6_dev *idev;
1233         struct mld_msg *mld;
1234         int addr_type;
1235
1236         /* Our own report looped back. Ignore it. */
1237         if (skb->pkt_type == PACKET_LOOPBACK)
1238                 return 0;
1239
1240         /* send our report if the MC router may not have heard this report */
1241         if (skb->pkt_type != PACKET_MULTICAST &&
1242             skb->pkt_type != PACKET_BROADCAST)
1243                 return 0;
1244
1245         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1246                 return -EINVAL;
1247
1248         mld = (struct mld_msg *)icmp6_hdr(skb);
1249
1250         /* Drop reports with not link local source */
1251         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1252         if (addr_type != IPV6_ADDR_ANY &&
1253             !(addr_type&IPV6_ADDR_LINKLOCAL))
1254                 return -EINVAL;
1255
1256         idev = __in6_dev_get(skb->dev);
1257         if (idev == NULL)
1258                 return -ENODEV;
1259
1260         /*
1261          *      Cancel the timer for this group
1262          */
1263
1264         read_lock_bh(&idev->lock);
1265         for (ma = idev->mc_list; ma; ma=ma->next) {
1266                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1267                         spin_lock(&ma->mca_lock);
1268                         if (del_timer(&ma->mca_timer))
1269                                 atomic_dec(&ma->mca_refcnt);
1270                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1271                         spin_unlock(&ma->mca_lock);
1272                         break;
1273                 }
1274         }
1275         read_unlock_bh(&idev->lock);
1276         return 0;
1277 }
1278
1279 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1280         int gdeleted, int sdeleted)
1281 {
1282         switch (type) {
1283         case MLD2_MODE_IS_INCLUDE:
1284         case MLD2_MODE_IS_EXCLUDE:
1285                 if (gdeleted || sdeleted)
1286                         return 0;
1287                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1288                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1289                                 return 1;
1290                         /* don't include if this source is excluded
1291                          * in all filters
1292                          */
1293                         if (psf->sf_count[MCAST_INCLUDE])
1294                                 return type == MLD2_MODE_IS_INCLUDE;
1295                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1296                                 psf->sf_count[MCAST_EXCLUDE];
1297                 }
1298                 return 0;
1299         case MLD2_CHANGE_TO_INCLUDE:
1300                 if (gdeleted || sdeleted)
1301                         return 0;
1302                 return psf->sf_count[MCAST_INCLUDE] != 0;
1303         case MLD2_CHANGE_TO_EXCLUDE:
1304                 if (gdeleted || sdeleted)
1305                         return 0;
1306                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1307                     psf->sf_count[MCAST_INCLUDE])
1308                         return 0;
1309                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1310                         psf->sf_count[MCAST_EXCLUDE];
1311         case MLD2_ALLOW_NEW_SOURCES:
1312                 if (gdeleted || !psf->sf_crcount)
1313                         return 0;
1314                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1315         case MLD2_BLOCK_OLD_SOURCES:
1316                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1317                         return gdeleted || (psf->sf_crcount && sdeleted);
1318                 return psf->sf_crcount && !gdeleted && !sdeleted;
1319         }
1320         return 0;
1321 }
1322
1323 static int
1324 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1325 {
1326         struct ip6_sf_list *psf;
1327         int scount = 0;
1328
1329         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1330                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1331                         continue;
1332                 scount++;
1333         }
1334         return scount;
1335 }
1336
1337 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1338 {
1339         struct net_device *dev = idev->dev;
1340         struct net *net = dev_net(dev);
1341         struct sock *sk = net->ipv6.igmp_sk;
1342         struct sk_buff *skb;
1343         struct mld2_report *pmr;
1344         struct in6_addr addr_buf;
1345         const struct in6_addr *saddr;
1346         int err;
1347         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1348                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1349                      IPV6_TLV_PADN, 0 };
1350
1351         /* we assume size > sizeof(ra) here */
1352         size += LL_ALLOCATED_SPACE(dev);
1353         /* limit our allocations to order-0 page */
1354         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1355         skb = sock_alloc_send_skb(sk, size, 1, &err);
1356
1357         if (!skb)
1358                 return NULL;
1359
1360         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1361
1362         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1363                 /* <draft-ietf-magma-mld-source-05.txt>:
1364                  * use unspecified address as the source address
1365                  * when a valid link-local address is not available.
1366                  */
1367                 saddr = &in6addr_any;
1368         } else
1369                 saddr = &addr_buf;
1370
1371         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1372
1373         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1374
1375         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1376         skb_put(skb, sizeof(*pmr));
1377         pmr = (struct mld2_report *)skb_transport_header(skb);
1378         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1379         pmr->mld2r_resv1 = 0;
1380         pmr->mld2r_cksum = 0;
1381         pmr->mld2r_resv2 = 0;
1382         pmr->mld2r_ngrec = 0;
1383         return skb;
1384 }
1385
1386 static void mld_sendpack(struct sk_buff *skb)
1387 {
1388         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1389         struct mld2_report *pmr =
1390                               (struct mld2_report *)skb_transport_header(skb);
1391         int payload_len, mldlen;
1392         struct inet6_dev *idev;
1393         struct net *net = dev_net(skb->dev);
1394         int err;
1395         struct flowi6 fl6;
1396         struct dst_entry *dst;
1397
1398         rcu_read_lock();
1399         idev = __in6_dev_get(skb->dev);
1400         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1401
1402         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1403         mldlen = skb->tail - skb->transport_header;
1404         pip6->payload_len = htons(payload_len);
1405
1406         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1407                                            IPPROTO_ICMPV6,
1408                                            csum_partial(skb_transport_header(skb),
1409                                                         mldlen, 0));
1410
1411         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1412
1413         if (!dst) {
1414                 err = -ENOMEM;
1415                 goto err_out;
1416         }
1417
1418         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1419                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1420                          skb->dev->ifindex);
1421
1422         dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1423         err = 0;
1424         if (IS_ERR(dst)) {
1425                 err = PTR_ERR(dst);
1426                 dst = NULL;
1427         }
1428         skb_dst_set(skb, dst);
1429         if (err)
1430                 goto err_out;
1431
1432         payload_len = skb->len;
1433
1434         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1435                       dst_output);
1436 out:
1437         if (!err) {
1438                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1439                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1440                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1441         } else
1442                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1443
1444         rcu_read_unlock();
1445         return;
1446
1447 err_out:
1448         kfree_skb(skb);
1449         goto out;
1450 }
1451
1452 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1453 {
1454         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1455 }
1456
1457 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1458         int type, struct mld2_grec **ppgr)
1459 {
1460         struct net_device *dev = pmc->idev->dev;
1461         struct mld2_report *pmr;
1462         struct mld2_grec *pgr;
1463
1464         if (!skb)
1465                 skb = mld_newpack(pmc->idev, dev->mtu);
1466         if (!skb)
1467                 return NULL;
1468         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1469         pgr->grec_type = type;
1470         pgr->grec_auxwords = 0;
1471         pgr->grec_nsrcs = 0;
1472         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1473         pmr = (struct mld2_report *)skb_transport_header(skb);
1474         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1475         *ppgr = pgr;
1476         return skb;
1477 }
1478
1479 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1480         skb_tailroom(skb)) : 0)
1481
1482 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1483         int type, int gdeleted, int sdeleted)
1484 {
1485         struct inet6_dev *idev = pmc->idev;
1486         struct net_device *dev = idev->dev;
1487         struct mld2_report *pmr;
1488         struct mld2_grec *pgr = NULL;
1489         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1490         int scount, stotal, first, isquery, truncate;
1491
1492         if (pmc->mca_flags & MAF_NOREPORT)
1493                 return skb;
1494
1495         isquery = type == MLD2_MODE_IS_INCLUDE ||
1496                   type == MLD2_MODE_IS_EXCLUDE;
1497         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1498                     type == MLD2_CHANGE_TO_EXCLUDE;
1499
1500         stotal = scount = 0;
1501
1502         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1503
1504         if (!*psf_list)
1505                 goto empty_source;
1506
1507         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1508
1509         /* EX and TO_EX get a fresh packet, if needed */
1510         if (truncate) {
1511                 if (pmr && pmr->mld2r_ngrec &&
1512                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1513                         if (skb)
1514                                 mld_sendpack(skb);
1515                         skb = mld_newpack(idev, dev->mtu);
1516                 }
1517         }
1518         first = 1;
1519         psf_prev = NULL;
1520         for (psf=*psf_list; psf; psf=psf_next) {
1521                 struct in6_addr *psrc;
1522
1523                 psf_next = psf->sf_next;
1524
1525                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1526                         psf_prev = psf;
1527                         continue;
1528                 }
1529
1530                 /* clear marks on query responses */
1531                 if (isquery)
1532                         psf->sf_gsresp = 0;
1533
1534                 if (AVAILABLE(skb) < sizeof(*psrc) +
1535                     first*sizeof(struct mld2_grec)) {
1536                         if (truncate && !first)
1537                                 break;   /* truncate these */
1538                         if (pgr)
1539                                 pgr->grec_nsrcs = htons(scount);
1540                         if (skb)
1541                                 mld_sendpack(skb);
1542                         skb = mld_newpack(idev, dev->mtu);
1543                         first = 1;
1544                         scount = 0;
1545                 }
1546                 if (first) {
1547                         skb = add_grhead(skb, pmc, type, &pgr);
1548                         first = 0;
1549                 }
1550                 if (!skb)
1551                         return NULL;
1552                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1553                 *psrc = psf->sf_addr;
1554                 scount++; stotal++;
1555                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1556                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1557                         psf->sf_crcount--;
1558                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1559                                 if (psf_prev)
1560                                         psf_prev->sf_next = psf->sf_next;
1561                                 else
1562                                         *psf_list = psf->sf_next;
1563                                 kfree(psf);
1564                                 continue;
1565                         }
1566                 }
1567                 psf_prev = psf;
1568         }
1569
1570 empty_source:
1571         if (!stotal) {
1572                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1573                     type == MLD2_BLOCK_OLD_SOURCES)
1574                         return skb;
1575                 if (pmc->mca_crcount || isquery) {
1576                         /* make sure we have room for group header */
1577                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1578                                 mld_sendpack(skb);
1579                                 skb = NULL; /* add_grhead will get a new one */
1580                         }
1581                         skb = add_grhead(skb, pmc, type, &pgr);
1582                 }
1583         }
1584         if (pgr)
1585                 pgr->grec_nsrcs = htons(scount);
1586
1587         if (isquery)
1588                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1589         return skb;
1590 }
1591
1592 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1593 {
1594         struct sk_buff *skb = NULL;
1595         int type;
1596
1597         read_lock_bh(&idev->lock);
1598         if (!pmc) {
1599                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1600                         if (pmc->mca_flags & MAF_NOREPORT)
1601                                 continue;
1602                         spin_lock_bh(&pmc->mca_lock);
1603                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1604                                 type = MLD2_MODE_IS_EXCLUDE;
1605                         else
1606                                 type = MLD2_MODE_IS_INCLUDE;
1607                         skb = add_grec(skb, pmc, type, 0, 0);
1608                         spin_unlock_bh(&pmc->mca_lock);
1609                 }
1610         } else {
1611                 spin_lock_bh(&pmc->mca_lock);
1612                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1613                         type = MLD2_MODE_IS_EXCLUDE;
1614                 else
1615                         type = MLD2_MODE_IS_INCLUDE;
1616                 skb = add_grec(skb, pmc, type, 0, 0);
1617                 spin_unlock_bh(&pmc->mca_lock);
1618         }
1619         read_unlock_bh(&idev->lock);
1620         if (skb)
1621                 mld_sendpack(skb);
1622 }
1623
1624 /*
1625  * remove zero-count source records from a source filter list
1626  */
1627 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1628 {
1629         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1630
1631         psf_prev = NULL;
1632         for (psf=*ppsf; psf; psf = psf_next) {
1633                 psf_next = psf->sf_next;
1634                 if (psf->sf_crcount == 0) {
1635                         if (psf_prev)
1636                                 psf_prev->sf_next = psf->sf_next;
1637                         else
1638                                 *ppsf = psf->sf_next;
1639                         kfree(psf);
1640                 } else
1641                         psf_prev = psf;
1642         }
1643 }
1644
1645 static void mld_send_cr(struct inet6_dev *idev)
1646 {
1647         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1648         struct sk_buff *skb = NULL;
1649         int type, dtype;
1650
1651         read_lock_bh(&idev->lock);
1652         spin_lock(&idev->mc_lock);
1653
1654         /* deleted MCA's */
1655         pmc_prev = NULL;
1656         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1657                 pmc_next = pmc->next;
1658                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1659                         type = MLD2_BLOCK_OLD_SOURCES;
1660                         dtype = MLD2_BLOCK_OLD_SOURCES;
1661                         skb = add_grec(skb, pmc, type, 1, 0);
1662                         skb = add_grec(skb, pmc, dtype, 1, 1);
1663                 }
1664                 if (pmc->mca_crcount) {
1665                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1666                                 type = MLD2_CHANGE_TO_INCLUDE;
1667                                 skb = add_grec(skb, pmc, type, 1, 0);
1668                         }
1669                         pmc->mca_crcount--;
1670                         if (pmc->mca_crcount == 0) {
1671                                 mld_clear_zeros(&pmc->mca_tomb);
1672                                 mld_clear_zeros(&pmc->mca_sources);
1673                         }
1674                 }
1675                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1676                     !pmc->mca_sources) {
1677                         if (pmc_prev)
1678                                 pmc_prev->next = pmc_next;
1679                         else
1680                                 idev->mc_tomb = pmc_next;
1681                         in6_dev_put(pmc->idev);
1682                         kfree(pmc);
1683                 } else
1684                         pmc_prev = pmc;
1685         }
1686         spin_unlock(&idev->mc_lock);
1687
1688         /* change recs */
1689         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1690                 spin_lock_bh(&pmc->mca_lock);
1691                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1692                         type = MLD2_BLOCK_OLD_SOURCES;
1693                         dtype = MLD2_ALLOW_NEW_SOURCES;
1694                 } else {
1695                         type = MLD2_ALLOW_NEW_SOURCES;
1696                         dtype = MLD2_BLOCK_OLD_SOURCES;
1697                 }
1698                 skb = add_grec(skb, pmc, type, 0, 0);
1699                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1700
1701                 /* filter mode changes */
1702                 if (pmc->mca_crcount) {
1703                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1704                                 type = MLD2_CHANGE_TO_EXCLUDE;
1705                         else
1706                                 type = MLD2_CHANGE_TO_INCLUDE;
1707                         skb = add_grec(skb, pmc, type, 0, 0);
1708                         pmc->mca_crcount--;
1709                 }
1710                 spin_unlock_bh(&pmc->mca_lock);
1711         }
1712         read_unlock_bh(&idev->lock);
1713         if (!skb)
1714                 return;
1715         (void) mld_sendpack(skb);
1716 }
1717
1718 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1719 {
1720         struct net *net = dev_net(dev);
1721         struct sock *sk = net->ipv6.igmp_sk;
1722         struct inet6_dev *idev;
1723         struct sk_buff *skb;
1724         struct mld_msg *hdr;
1725         const struct in6_addr *snd_addr, *saddr;
1726         struct in6_addr addr_buf;
1727         int err, len, payload_len, full_len;
1728         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1729                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1730                      IPV6_TLV_PADN, 0 };
1731         struct flowi6 fl6;
1732         struct dst_entry *dst;
1733
1734         if (type == ICMPV6_MGM_REDUCTION)
1735                 snd_addr = &in6addr_linklocal_allrouters;
1736         else
1737                 snd_addr = addr;
1738
1739         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1740         payload_len = len + sizeof(ra);
1741         full_len = sizeof(struct ipv6hdr) + payload_len;
1742
1743         rcu_read_lock();
1744         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1745                       IPSTATS_MIB_OUT, full_len);
1746         rcu_read_unlock();
1747
1748         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1749
1750         if (skb == NULL) {
1751                 rcu_read_lock();
1752                 IP6_INC_STATS(net, __in6_dev_get(dev),
1753                               IPSTATS_MIB_OUTDISCARDS);
1754                 rcu_read_unlock();
1755                 return;
1756         }
1757
1758         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1759
1760         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1761                 /* <draft-ietf-magma-mld-source-05.txt>:
1762                  * use unspecified address as the source address
1763                  * when a valid link-local address is not available.
1764                  */
1765                 saddr = &in6addr_any;
1766         } else
1767                 saddr = &addr_buf;
1768
1769         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1770
1771         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1772
1773         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1774         memset(hdr, 0, sizeof(struct mld_msg));
1775         hdr->mld_type = type;
1776         ipv6_addr_copy(&hdr->mld_mca, addr);
1777
1778         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1779                                          IPPROTO_ICMPV6,
1780                                          csum_partial(hdr, len, 0));
1781
1782         rcu_read_lock();
1783         idev = __in6_dev_get(skb->dev);
1784
1785         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1786         if (!dst) {
1787                 err = -ENOMEM;
1788                 goto err_out;
1789         }
1790
1791         icmpv6_flow_init(sk, &fl6, type,
1792                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1793                          skb->dev->ifindex);
1794
1795         dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1796         if (IS_ERR(dst)) {
1797                 err = PTR_ERR(dst);
1798                 goto err_out;
1799         }
1800
1801         skb_dst_set(skb, dst);
1802         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1803                       dst_output);
1804 out:
1805         if (!err) {
1806                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1807                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1808                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1809         } else
1810                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1811
1812         rcu_read_unlock();
1813         return;
1814
1815 err_out:
1816         kfree_skb(skb);
1817         goto out;
1818 }
1819
1820 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1821         const struct in6_addr *psfsrc)
1822 {
1823         struct ip6_sf_list *psf, *psf_prev;
1824         int rv = 0;
1825
1826         psf_prev = NULL;
1827         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1828                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1829                         break;
1830                 psf_prev = psf;
1831         }
1832         if (!psf || psf->sf_count[sfmode] == 0) {
1833                 /* source filter not found, or count wrong =>  bug */
1834                 return -ESRCH;
1835         }
1836         psf->sf_count[sfmode]--;
1837         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1838                 struct inet6_dev *idev = pmc->idev;
1839
1840                 /* no more filters for this source */
1841                 if (psf_prev)
1842                         psf_prev->sf_next = psf->sf_next;
1843                 else
1844                         pmc->mca_sources = psf->sf_next;
1845                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1846                     !MLD_V1_SEEN(idev)) {
1847                         psf->sf_crcount = idev->mc_qrv;
1848                         psf->sf_next = pmc->mca_tomb;
1849                         pmc->mca_tomb = psf;
1850                         rv = 1;
1851                 } else
1852                         kfree(psf);
1853         }
1854         return rv;
1855 }
1856
1857 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1858                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1859                           int delta)
1860 {
1861         struct ifmcaddr6 *pmc;
1862         int     changerec = 0;
1863         int     i, err;
1864
1865         if (!idev)
1866                 return -ENODEV;
1867         read_lock_bh(&idev->lock);
1868         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1869                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1870                         break;
1871         }
1872         if (!pmc) {
1873                 /* MCA not found?? bug */
1874                 read_unlock_bh(&idev->lock);
1875                 return -ESRCH;
1876         }
1877         spin_lock_bh(&pmc->mca_lock);
1878         sf_markstate(pmc);
1879         if (!delta) {
1880                 if (!pmc->mca_sfcount[sfmode]) {
1881                         spin_unlock_bh(&pmc->mca_lock);
1882                         read_unlock_bh(&idev->lock);
1883                         return -EINVAL;
1884                 }
1885                 pmc->mca_sfcount[sfmode]--;
1886         }
1887         err = 0;
1888         for (i=0; i<sfcount; i++) {
1889                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1890
1891                 changerec |= rv > 0;
1892                 if (!err && rv < 0)
1893                         err = rv;
1894         }
1895         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1896             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1897             pmc->mca_sfcount[MCAST_INCLUDE]) {
1898                 struct ip6_sf_list *psf;
1899
1900                 /* filter mode change */
1901                 pmc->mca_sfmode = MCAST_INCLUDE;
1902                 pmc->mca_crcount = idev->mc_qrv;
1903                 idev->mc_ifc_count = pmc->mca_crcount;
1904                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1905                         psf->sf_crcount = 0;
1906                 mld_ifc_event(pmc->idev);
1907         } else if (sf_setstate(pmc) || changerec)
1908                 mld_ifc_event(pmc->idev);
1909         spin_unlock_bh(&pmc->mca_lock);
1910         read_unlock_bh(&idev->lock);
1911         return err;
1912 }
1913
1914 /*
1915  * Add multicast single-source filter to the interface list
1916  */
1917 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1918         const struct in6_addr *psfsrc, int delta)
1919 {
1920         struct ip6_sf_list *psf, *psf_prev;
1921
1922         psf_prev = NULL;
1923         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1924                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1925                         break;
1926                 psf_prev = psf;
1927         }
1928         if (!psf) {
1929                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1930                 if (!psf)
1931                         return -ENOBUFS;
1932
1933                 psf->sf_addr = *psfsrc;
1934                 if (psf_prev) {
1935                         psf_prev->sf_next = psf;
1936                 } else
1937                         pmc->mca_sources = psf;
1938         }
1939         psf->sf_count[sfmode]++;
1940         return 0;
1941 }
1942
1943 static void sf_markstate(struct ifmcaddr6 *pmc)
1944 {
1945         struct ip6_sf_list *psf;
1946         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1947
1948         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1949                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1950                         psf->sf_oldin = mca_xcount ==
1951                                 psf->sf_count[MCAST_EXCLUDE] &&
1952                                 !psf->sf_count[MCAST_INCLUDE];
1953                 } else
1954                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1955 }
1956
1957 static int sf_setstate(struct ifmcaddr6 *pmc)
1958 {
1959         struct ip6_sf_list *psf, *dpsf;
1960         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1961         int qrv = pmc->idev->mc_qrv;
1962         int new_in, rv;
1963
1964         rv = 0;
1965         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1966                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1967                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1968                                 !psf->sf_count[MCAST_INCLUDE];
1969                 } else
1970                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1971                 if (new_in) {
1972                         if (!psf->sf_oldin) {
1973                                 struct ip6_sf_list *prev = NULL;
1974
1975                                 for (dpsf=pmc->mca_tomb; dpsf;
1976                                      dpsf=dpsf->sf_next) {
1977                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1978                                             &psf->sf_addr))
1979                                                 break;
1980                                         prev = dpsf;
1981                                 }
1982                                 if (dpsf) {
1983                                         if (prev)
1984                                                 prev->sf_next = dpsf->sf_next;
1985                                         else
1986                                                 pmc->mca_tomb = dpsf->sf_next;
1987                                         kfree(dpsf);
1988                                 }
1989                                 psf->sf_crcount = qrv;
1990                                 rv++;
1991                         }
1992                 } else if (psf->sf_oldin) {
1993                         psf->sf_crcount = 0;
1994                         /*
1995                          * add or update "delete" records if an active filter
1996                          * is now inactive
1997                          */
1998                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1999                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2000                                     &psf->sf_addr))
2001                                         break;
2002                         if (!dpsf) {
2003                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2004                                 if (!dpsf)
2005                                         continue;
2006                                 *dpsf = *psf;
2007                                 /* pmc->mca_lock held by callers */
2008                                 dpsf->sf_next = pmc->mca_tomb;
2009                                 pmc->mca_tomb = dpsf;
2010                         }
2011                         dpsf->sf_crcount = qrv;
2012                         rv++;
2013                 }
2014         }
2015         return rv;
2016 }
2017
2018 /*
2019  * Add multicast source filter list to the interface list
2020  */
2021 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2022                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2023                           int delta)
2024 {
2025         struct ifmcaddr6 *pmc;
2026         int     isexclude;
2027         int     i, err;
2028
2029         if (!idev)
2030                 return -ENODEV;
2031         read_lock_bh(&idev->lock);
2032         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2033                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2034                         break;
2035         }
2036         if (!pmc) {
2037                 /* MCA not found?? bug */
2038                 read_unlock_bh(&idev->lock);
2039                 return -ESRCH;
2040         }
2041         spin_lock_bh(&pmc->mca_lock);
2042
2043         sf_markstate(pmc);
2044         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2045         if (!delta)
2046                 pmc->mca_sfcount[sfmode]++;
2047         err = 0;
2048         for (i=0; i<sfcount; i++) {
2049                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2050                 if (err)
2051                         break;
2052         }
2053         if (err) {
2054                 int j;
2055
2056                 if (!delta)
2057                         pmc->mca_sfcount[sfmode]--;
2058                 for (j=0; j<i; j++)
2059                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2060         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2061                 struct ip6_sf_list *psf;
2062
2063                 /* filter mode change */
2064                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2065                         pmc->mca_sfmode = MCAST_EXCLUDE;
2066                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2067                         pmc->mca_sfmode = MCAST_INCLUDE;
2068                 /* else no filters; keep old mode for reports */
2069
2070                 pmc->mca_crcount = idev->mc_qrv;
2071                 idev->mc_ifc_count = pmc->mca_crcount;
2072                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2073                         psf->sf_crcount = 0;
2074                 mld_ifc_event(idev);
2075         } else if (sf_setstate(pmc))
2076                 mld_ifc_event(idev);
2077         spin_unlock_bh(&pmc->mca_lock);
2078         read_unlock_bh(&idev->lock);
2079         return err;
2080 }
2081
2082 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2083 {
2084         struct ip6_sf_list *psf, *nextpsf;
2085
2086         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2087                 nextpsf = psf->sf_next;
2088                 kfree(psf);
2089         }
2090         pmc->mca_tomb = NULL;
2091         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2092                 nextpsf = psf->sf_next;
2093                 kfree(psf);
2094         }
2095         pmc->mca_sources = NULL;
2096         pmc->mca_sfmode = MCAST_EXCLUDE;
2097         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2098         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2099 }
2100
2101
2102 static void igmp6_join_group(struct ifmcaddr6 *ma)
2103 {
2104         unsigned long delay;
2105
2106         if (ma->mca_flags & MAF_NOREPORT)
2107                 return;
2108
2109         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2110
2111         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2112
2113         spin_lock_bh(&ma->mca_lock);
2114         if (del_timer(&ma->mca_timer)) {
2115                 atomic_dec(&ma->mca_refcnt);
2116                 delay = ma->mca_timer.expires - jiffies;
2117         }
2118
2119         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2120                 atomic_inc(&ma->mca_refcnt);
2121         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2122         spin_unlock_bh(&ma->mca_lock);
2123 }
2124
2125 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2126                             struct inet6_dev *idev)
2127 {
2128         int err;
2129
2130         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2131          * so no other readers or writers of iml or its sflist
2132          */
2133         if (!iml->sflist) {
2134                 /* any-source empty exclude case */
2135                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2136         }
2137         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2138                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2139         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2140         iml->sflist = NULL;
2141         return err;
2142 }
2143
2144 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2145 {
2146         if (MLD_V1_SEEN(ma->idev)) {
2147                 if (ma->mca_flags & MAF_LAST_REPORTER)
2148                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2149                                 ICMPV6_MGM_REDUCTION);
2150         } else {
2151                 mld_add_delrec(ma->idev, ma);
2152                 mld_ifc_event(ma->idev);
2153         }
2154 }
2155
2156 static void mld_gq_timer_expire(unsigned long data)
2157 {
2158         struct inet6_dev *idev = (struct inet6_dev *)data;
2159
2160         idev->mc_gq_running = 0;
2161         mld_send_report(idev, NULL);
2162         in6_dev_put(idev);
2163 }
2164
2165 static void mld_ifc_timer_expire(unsigned long data)
2166 {
2167         struct inet6_dev *idev = (struct inet6_dev *)data;
2168
2169         mld_send_cr(idev);
2170         if (idev->mc_ifc_count) {
2171                 idev->mc_ifc_count--;
2172                 if (idev->mc_ifc_count)
2173                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2174         }
2175         in6_dev_put(idev);
2176 }
2177
2178 static void mld_ifc_event(struct inet6_dev *idev)
2179 {
2180         if (MLD_V1_SEEN(idev))
2181                 return;
2182         idev->mc_ifc_count = idev->mc_qrv;
2183         mld_ifc_start_timer(idev, 1);
2184 }
2185
2186
2187 static void igmp6_timer_handler(unsigned long data)
2188 {
2189         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2190
2191         if (MLD_V1_SEEN(ma->idev))
2192                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2193         else
2194                 mld_send_report(ma->idev, ma);
2195
2196         spin_lock(&ma->mca_lock);
2197         ma->mca_flags |=  MAF_LAST_REPORTER;
2198         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2199         spin_unlock(&ma->mca_lock);
2200         ma_put(ma);
2201 }
2202
2203 /* Device changing type */
2204
2205 void ipv6_mc_unmap(struct inet6_dev *idev)
2206 {
2207         struct ifmcaddr6 *i;
2208
2209         /* Install multicast list, except for all-nodes (already installed) */
2210
2211         read_lock_bh(&idev->lock);
2212         for (i = idev->mc_list; i; i = i->next)
2213                 igmp6_group_dropped(i);
2214         read_unlock_bh(&idev->lock);
2215 }
2216
2217 void ipv6_mc_remap(struct inet6_dev *idev)
2218 {
2219         ipv6_mc_up(idev);
2220 }
2221
2222 /* Device going down */
2223
2224 void ipv6_mc_down(struct inet6_dev *idev)
2225 {
2226         struct ifmcaddr6 *i;
2227
2228         /* Withdraw multicast list */
2229
2230         read_lock_bh(&idev->lock);
2231         idev->mc_ifc_count = 0;
2232         if (del_timer(&idev->mc_ifc_timer))
2233                 __in6_dev_put(idev);
2234         idev->mc_gq_running = 0;
2235         if (del_timer(&idev->mc_gq_timer))
2236                 __in6_dev_put(idev);
2237
2238         for (i = idev->mc_list; i; i=i->next)
2239                 igmp6_group_dropped(i);
2240         read_unlock_bh(&idev->lock);
2241
2242         mld_clear_delrec(idev);
2243 }
2244
2245
2246 /* Device going up */
2247
2248 void ipv6_mc_up(struct inet6_dev *idev)
2249 {
2250         struct ifmcaddr6 *i;
2251
2252         /* Install multicast list, except for all-nodes (already installed) */
2253
2254         read_lock_bh(&idev->lock);
2255         for (i = idev->mc_list; i; i=i->next)
2256                 igmp6_group_added(i);
2257         read_unlock_bh(&idev->lock);
2258 }
2259
2260 /* IPv6 device initialization. */
2261
2262 void ipv6_mc_init_dev(struct inet6_dev *idev)
2263 {
2264         write_lock_bh(&idev->lock);
2265         spin_lock_init(&idev->mc_lock);
2266         idev->mc_gq_running = 0;
2267         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2268                         (unsigned long)idev);
2269         idev->mc_tomb = NULL;
2270         idev->mc_ifc_count = 0;
2271         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2272                         (unsigned long)idev);
2273         idev->mc_qrv = MLD_QRV_DEFAULT;
2274         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2275         idev->mc_v1_seen = 0;
2276         write_unlock_bh(&idev->lock);
2277 }
2278
2279 /*
2280  *      Device is about to be destroyed: clean up.
2281  */
2282
2283 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2284 {
2285         struct ifmcaddr6 *i;
2286
2287         /* Deactivate timers */
2288         ipv6_mc_down(idev);
2289
2290         /* Delete all-nodes address. */
2291         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2292          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2293          * fail.
2294          */
2295         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2296
2297         if (idev->cnf.forwarding)
2298                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2299
2300         write_lock_bh(&idev->lock);
2301         while ((i = idev->mc_list) != NULL) {
2302                 idev->mc_list = i->next;
2303                 write_unlock_bh(&idev->lock);
2304
2305                 igmp6_group_dropped(i);
2306                 ma_put(i);
2307
2308                 write_lock_bh(&idev->lock);
2309         }
2310         write_unlock_bh(&idev->lock);
2311 }
2312
2313 #ifdef CONFIG_PROC_FS
2314 struct igmp6_mc_iter_state {
2315         struct seq_net_private p;
2316         struct net_device *dev;
2317         struct inet6_dev *idev;
2318 };
2319
2320 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2321
2322 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2323 {
2324         struct ifmcaddr6 *im = NULL;
2325         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2326         struct net *net = seq_file_net(seq);
2327
2328         state->idev = NULL;
2329         for_each_netdev_rcu(net, state->dev) {
2330                 struct inet6_dev *idev;
2331                 idev = __in6_dev_get(state->dev);
2332                 if (!idev)
2333                         continue;
2334                 read_lock_bh(&idev->lock);
2335                 im = idev->mc_list;
2336                 if (im) {
2337                         state->idev = idev;
2338                         break;
2339                 }
2340                 read_unlock_bh(&idev->lock);
2341         }
2342         return im;
2343 }
2344
2345 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2346 {
2347         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2348
2349         im = im->next;
2350         while (!im) {
2351                 if (likely(state->idev != NULL))
2352                         read_unlock_bh(&state->idev->lock);
2353
2354                 state->dev = next_net_device_rcu(state->dev);
2355                 if (!state->dev) {
2356                         state->idev = NULL;
2357                         break;
2358                 }
2359                 state->idev = __in6_dev_get(state->dev);
2360                 if (!state->idev)
2361                         continue;
2362                 read_lock_bh(&state->idev->lock);
2363                 im = state->idev->mc_list;
2364         }
2365         return im;
2366 }
2367
2368 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2369 {
2370         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2371         if (im)
2372                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2373                         --pos;
2374         return pos ? NULL : im;
2375 }
2376
2377 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2378         __acquires(RCU)
2379 {
2380         rcu_read_lock();
2381         return igmp6_mc_get_idx(seq, *pos);
2382 }
2383
2384 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2385 {
2386         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2387
2388         ++*pos;
2389         return im;
2390 }
2391
2392 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2393         __releases(RCU)
2394 {
2395         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2396
2397         if (likely(state->idev != NULL)) {
2398                 read_unlock_bh(&state->idev->lock);
2399                 state->idev = NULL;
2400         }
2401         state->dev = NULL;
2402         rcu_read_unlock();
2403 }
2404
2405 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2406 {
2407         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2408         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2409
2410         seq_printf(seq,
2411                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2412                    state->dev->ifindex, state->dev->name,
2413                    &im->mca_addr,
2414                    im->mca_users, im->mca_flags,
2415                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2416                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2417         return 0;
2418 }
2419
2420 static const struct seq_operations igmp6_mc_seq_ops = {
2421         .start  =       igmp6_mc_seq_start,
2422         .next   =       igmp6_mc_seq_next,
2423         .stop   =       igmp6_mc_seq_stop,
2424         .show   =       igmp6_mc_seq_show,
2425 };
2426
2427 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2428 {
2429         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2430                             sizeof(struct igmp6_mc_iter_state));
2431 }
2432
2433 static const struct file_operations igmp6_mc_seq_fops = {
2434         .owner          =       THIS_MODULE,
2435         .open           =       igmp6_mc_seq_open,
2436         .read           =       seq_read,
2437         .llseek         =       seq_lseek,
2438         .release        =       seq_release_net,
2439 };
2440
2441 struct igmp6_mcf_iter_state {
2442         struct seq_net_private p;
2443         struct net_device *dev;
2444         struct inet6_dev *idev;
2445         struct ifmcaddr6 *im;
2446 };
2447
2448 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2449
2450 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2451 {
2452         struct ip6_sf_list *psf = NULL;
2453         struct ifmcaddr6 *im = NULL;
2454         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2455         struct net *net = seq_file_net(seq);
2456
2457         state->idev = NULL;
2458         state->im = NULL;
2459         for_each_netdev_rcu(net, state->dev) {
2460                 struct inet6_dev *idev;
2461                 idev = __in6_dev_get(state->dev);
2462                 if (unlikely(idev == NULL))
2463                         continue;
2464                 read_lock_bh(&idev->lock);
2465                 im = idev->mc_list;
2466                 if (likely(im != NULL)) {
2467                         spin_lock_bh(&im->mca_lock);
2468                         psf = im->mca_sources;
2469                         if (likely(psf != NULL)) {
2470                                 state->im = im;
2471                                 state->idev = idev;
2472                                 break;
2473                         }
2474                         spin_unlock_bh(&im->mca_lock);
2475                 }
2476                 read_unlock_bh(&idev->lock);
2477         }
2478         return psf;
2479 }
2480
2481 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2482 {
2483         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2484
2485         psf = psf->sf_next;
2486         while (!psf) {
2487                 spin_unlock_bh(&state->im->mca_lock);
2488                 state->im = state->im->next;
2489                 while (!state->im) {
2490                         if (likely(state->idev != NULL))
2491                                 read_unlock_bh(&state->idev->lock);
2492
2493                         state->dev = next_net_device_rcu(state->dev);
2494                         if (!state->dev) {
2495                                 state->idev = NULL;
2496                                 goto out;
2497                         }
2498                         state->idev = __in6_dev_get(state->dev);
2499                         if (!state->idev)
2500                                 continue;
2501                         read_lock_bh(&state->idev->lock);
2502                         state->im = state->idev->mc_list;
2503                 }
2504                 if (!state->im)
2505                         break;
2506                 spin_lock_bh(&state->im->mca_lock);
2507                 psf = state->im->mca_sources;
2508         }
2509 out:
2510         return psf;
2511 }
2512
2513 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2514 {
2515         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2516         if (psf)
2517                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2518                         --pos;
2519         return pos ? NULL : psf;
2520 }
2521
2522 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2523         __acquires(RCU)
2524 {
2525         rcu_read_lock();
2526         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2527 }
2528
2529 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2530 {
2531         struct ip6_sf_list *psf;
2532         if (v == SEQ_START_TOKEN)
2533                 psf = igmp6_mcf_get_first(seq);
2534         else
2535                 psf = igmp6_mcf_get_next(seq, v);
2536         ++*pos;
2537         return psf;
2538 }
2539
2540 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2541         __releases(RCU)
2542 {
2543         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2544         if (likely(state->im != NULL)) {
2545                 spin_unlock_bh(&state->im->mca_lock);
2546                 state->im = NULL;
2547         }
2548         if (likely(state->idev != NULL)) {
2549                 read_unlock_bh(&state->idev->lock);
2550                 state->idev = NULL;
2551         }
2552         state->dev = NULL;
2553         rcu_read_unlock();
2554 }
2555
2556 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2557 {
2558         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2559         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2560
2561         if (v == SEQ_START_TOKEN) {
2562                 seq_printf(seq,
2563                            "%3s %6s "
2564                            "%32s %32s %6s %6s\n", "Idx",
2565                            "Device", "Multicast Address",
2566                            "Source Address", "INC", "EXC");
2567         } else {
2568                 seq_printf(seq,
2569                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2570                            state->dev->ifindex, state->dev->name,
2571                            &state->im->mca_addr,
2572                            &psf->sf_addr,
2573                            psf->sf_count[MCAST_INCLUDE],
2574                            psf->sf_count[MCAST_EXCLUDE]);
2575         }
2576         return 0;
2577 }
2578
2579 static const struct seq_operations igmp6_mcf_seq_ops = {
2580         .start  =       igmp6_mcf_seq_start,
2581         .next   =       igmp6_mcf_seq_next,
2582         .stop   =       igmp6_mcf_seq_stop,
2583         .show   =       igmp6_mcf_seq_show,
2584 };
2585
2586 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2587 {
2588         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2589                             sizeof(struct igmp6_mcf_iter_state));
2590 }
2591
2592 static const struct file_operations igmp6_mcf_seq_fops = {
2593         .owner          =       THIS_MODULE,
2594         .open           =       igmp6_mcf_seq_open,
2595         .read           =       seq_read,
2596         .llseek         =       seq_lseek,
2597         .release        =       seq_release_net,
2598 };
2599
2600 static int __net_init igmp6_proc_init(struct net *net)
2601 {
2602         int err;
2603
2604         err = -ENOMEM;
2605         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2606                 goto out;
2607         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2608                                   &igmp6_mcf_seq_fops))
2609                 goto out_proc_net_igmp6;
2610
2611         err = 0;
2612 out:
2613         return err;
2614
2615 out_proc_net_igmp6:
2616         proc_net_remove(net, "igmp6");
2617         goto out;
2618 }
2619
2620 static void __net_exit igmp6_proc_exit(struct net *net)
2621 {
2622         proc_net_remove(net, "mcfilter6");
2623         proc_net_remove(net, "igmp6");
2624 }
2625 #else
2626 static inline int igmp6_proc_init(struct net *net)
2627 {
2628         return 0;
2629 }
2630 static inline void igmp6_proc_exit(struct net *net)
2631 {
2632 }
2633 #endif
2634
2635 static int __net_init igmp6_net_init(struct net *net)
2636 {
2637         int err;
2638
2639         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2640                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2641         if (err < 0) {
2642                 printk(KERN_ERR
2643                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2644                        err);
2645                 goto out;
2646         }
2647
2648         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2649
2650         err = igmp6_proc_init(net);
2651         if (err)
2652                 goto out_sock_create;
2653 out:
2654         return err;
2655
2656 out_sock_create:
2657         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2658         goto out;
2659 }
2660
2661 static void __net_exit igmp6_net_exit(struct net *net)
2662 {
2663         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2664         igmp6_proc_exit(net);
2665 }
2666
2667 static struct pernet_operations igmp6_net_ops = {
2668         .init = igmp6_net_init,
2669         .exit = igmp6_net_exit,
2670 };
2671
2672 int __init igmp6_init(void)
2673 {
2674         return register_pernet_subsys(&igmp6_net_ops);
2675 }
2676
2677 void igmp6_cleanup(void)
2678 {
2679         unregister_pernet_subsys(&igmp6_net_ops);
2680 }