net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <[email protected]>
   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 <[email protected]>:
  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_RWLOCK(ipv6_sk_mc_lock);
  86
  87 static void igmp6_join_group(struct ifmcaddr6 *ma);
  88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89 static void igmp6_timer_handler(unsigned long data);
  90
  91 static void mld_gq_timer_expire(unsigned long data);
  92 static void mld_ifc_timer_expire(unsigned long data);
  93 static void mld_ifc_event(struct inet6_dev *idev);
  94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
  96 static void mld_clear_delrec(struct inet6_dev *idev);
  97 static int sf_setstate(struct ifmcaddr6 *pmc);
  98 static void sf_markstate(struct ifmcaddr6 *pmc);
  99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 101                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 102                           int delta);
 103 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 104                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 105                           int delta);
 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 107                             struct inet6_dev *idev);
 108
 109
 110 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 111 #define MLD_QRV_DEFAULT         2
 112
 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 114                 (idev)->cnf.force_mld_version == 1 || \
 115                 ((idev)->mc_v1_seen && \
 116                 time_before(jiffies, (idev)->mc_v1_seen)))
 117
 118 #define IPV6_MLD_MAX_MSF        64
 119
 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 121
 122 /*
 123  *      socket join on multicast group
 124  */
 125
 126 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 127 {
 128         struct net_device *dev = NULL;
 129         struct ipv6_mc_socklist *mc_lst;
 130         struct ipv6_pinfo *np = inet6_sk(sk);
 131         struct net *net = sock_net(sk);
 132         int err;
 133
 134         if (!ipv6_addr_is_multicast(addr))
 135                 return -EINVAL;
 136
 137         read_lock_bh(&ipv6_sk_mc_lock);
 138         for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
 139                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 140                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 141                         read_unlock_bh(&ipv6_sk_mc_lock);
 142                         return -EADDRINUSE;
 143                 }
 144         }
 145         read_unlock_bh(&ipv6_sk_mc_lock);
 146
 147         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 148
 149         if (mc_lst == NULL)
 150                 return -ENOMEM;
 151
 152         mc_lst->next = NULL;
 153         ipv6_addr_copy(&mc_lst->addr, addr);
 154
 155         rcu_read_lock();
 156         if (ifindex == 0) {
 157                 struct rt6_info *rt;
 158                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 159                 if (rt) {
 160                         dev = rt->rt6i_dev;
 161                         dst_release(&rt->dst);
 162                 }
 163         } else
 164                 dev = dev_get_by_index_rcu(net, ifindex);
 165
 166         if (dev == NULL) {
 167                 rcu_read_unlock();
 168                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 169                 return -ENODEV;
 170         }
 171
 172         mc_lst->ifindex = dev->ifindex;
 173         mc_lst->sfmode = MCAST_EXCLUDE;
 174         rwlock_init(&mc_lst->sflock);
 175         mc_lst->sflist = NULL;
 176
 177         /*
 178          *      now add/increase the group membership on the device
 179          */
 180
 181         err = ipv6_dev_mc_inc(dev, addr);
 182
 183         if (err) {
 184                 rcu_read_unlock();
 185                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 186                 return err;
 187         }
 188
 189         write_lock_bh(&ipv6_sk_mc_lock);
 190         mc_lst->next = np->ipv6_mc_list;
 191         np->ipv6_mc_list = mc_lst;
 192         write_unlock_bh(&ipv6_sk_mc_lock);
 193
 194         rcu_read_unlock();
 195
 196         return 0;
 197 }
 198
 199 /*
 200  *      socket leave on multicast group
 201  */
 202 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 203 {
 204         struct ipv6_pinfo *np = inet6_sk(sk);
 205         struct ipv6_mc_socklist *mc_lst, **lnk;
 206         struct net *net = sock_net(sk);
 207
 208         write_lock_bh(&ipv6_sk_mc_lock);
 209         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 210                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 211                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 212                         struct net_device *dev;
 213
 214                         *lnk = mc_lst->next;
 215                         write_unlock_bh(&ipv6_sk_mc_lock);
 216
 217                         rcu_read_lock();
 218                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 219                         if (dev != NULL) {
 220                                 struct inet6_dev *idev = __in6_dev_get(dev);
 221
 222                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 223                                 if (idev)
 224                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 225                         } else
 226                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 227                         rcu_read_unlock();
 228                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 229                         return 0;
 230                 }
 231         }
 232         write_unlock_bh(&ipv6_sk_mc_lock);
 233
 234         return -EADDRNOTAVAIL;
 235 }
 236
 237 /* called with rcu_read_lock() */
 238 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 239                                              struct in6_addr *group,
 240                                              int ifindex)
 241 {
 242         struct net_device *dev = NULL;
 243         struct inet6_dev *idev = NULL;
 244
 245         if (ifindex == 0) {
 246                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 247
 248                 if (rt) {
 249                         dev = rt->rt6i_dev;
 250                         dev_hold(dev);
 251                         dst_release(&rt->dst);
 252                 }
 253         } else
 254                 dev = dev_get_by_index_rcu(net, ifindex);
 255
 256         if (!dev)
 257                 return NULL;
 258         idev = __in6_dev_get(dev);
 259         if (!idev)
 260                 return NULL;;
 261         read_lock_bh(&idev->lock);
 262         if (idev->dead) {
 263                 read_unlock_bh(&idev->lock);
 264                 return NULL;
 265         }
 266         return idev;
 267 }
 268
 269 void ipv6_sock_mc_close(struct sock *sk)
 270 {
 271         struct ipv6_pinfo *np = inet6_sk(sk);
 272         struct ipv6_mc_socklist *mc_lst;
 273         struct net *net = sock_net(sk);
 274
 275         write_lock_bh(&ipv6_sk_mc_lock);
 276         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 277                 struct net_device *dev;
 278
 279                 np->ipv6_mc_list = mc_lst->next;
 280                 write_unlock_bh(&ipv6_sk_mc_lock);
 281
 282                 rcu_read_lock();
 283                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 284                 if (dev) {
 285                         struct inet6_dev *idev = __in6_dev_get(dev);
 286
 287                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 288                         if (idev)
 289                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 290                 } else
 291                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 292                 rcu_read_unlock();
 293                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 294
 295                 write_lock_bh(&ipv6_sk_mc_lock);
 296         }
 297         write_unlock_bh(&ipv6_sk_mc_lock);
 298 }
 299
 300 int ip6_mc_source(int add, int omode, struct sock *sk,
 301         struct group_source_req *pgsr)
 302 {
 303         struct in6_addr *source, *group;
 304         struct ipv6_mc_socklist *pmc;
 305         struct net_device *dev;
 306         struct inet6_dev *idev;
 307         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 308         struct ip6_sf_socklist *psl;
 309         struct net *net = sock_net(sk);
 310         int i, j, rv;
 311         int leavegroup = 0;
 312         int pmclocked = 0;
 313         int err;
 314
 315         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 316         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 317
 318         if (!ipv6_addr_is_multicast(group))
 319                 return -EINVAL;
 320
 321         rcu_read_lock();
 322         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 323         if (!idev) {
 324                 rcu_read_unlock();
 325                 return -ENODEV;
 326         }
 327         dev = idev->dev;
 328
 329         err = -EADDRNOTAVAIL;
 330
 331         read_lock(&ipv6_sk_mc_lock);
 332         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 333                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 334                         continue;
 335                 if (ipv6_addr_equal(&pmc->addr, group))
 336                         break;
 337         }
 338         if (!pmc) {             /* must have a prior join */
 339                 err = -EINVAL;
 340                 goto done;
 341         }
 342         /* if a source filter was set, must be the same mode as before */
 343         if (pmc->sflist) {
 344                 if (pmc->sfmode != omode) {
 345                         err = -EINVAL;
 346                         goto done;
 347                 }
 348         } else if (pmc->sfmode != omode) {
 349                 /* allow mode switches for empty-set filters */
 350                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 351                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 352                 pmc->sfmode = omode;
 353         }
 354
 355         write_lock(&pmc->sflock);
 356         pmclocked = 1;
 357
 358         psl = pmc->sflist;
 359         if (!add) {
 360                 if (!psl)
 361                         goto done;      /* err = -EADDRNOTAVAIL */
 362                 rv = !0;
 363                 for (i=0; i<psl->sl_count; i++) {
 364                         rv = memcmp(&psl->sl_addr[i], source,
 365                                 sizeof(struct in6_addr));
 366                         if (rv == 0)
 367                                 break;
 368                 }
 369                 if (rv)         /* source not found */
 370                         goto done;      /* err = -EADDRNOTAVAIL */
 371
 372                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 373                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 374                         leavegroup = 1;
 375                         goto done;
 376                 }
 377
 378                 /* update the interface filter */
 379                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 380
 381                 for (j=i+1; j<psl->sl_count; j++)
 382                         psl->sl_addr[j-1] = psl->sl_addr[j];
 383                 psl->sl_count--;
 384                 err = 0;
 385                 goto done;
 386         }
 387         /* else, add a new source to the filter */
 388
 389         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 390                 err = -ENOBUFS;
 391                 goto done;
 392         }
 393         if (!psl || psl->sl_count == psl->sl_max) {
 394                 struct ip6_sf_socklist *newpsl;
 395                 int count = IP6_SFBLOCK;
 396
 397                 if (psl)
 398                         count += psl->sl_max;
 399                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 400                 if (!newpsl) {
 401                         err = -ENOBUFS;
 402                         goto done;
 403                 }
 404                 newpsl->sl_max = count;
 405                 newpsl->sl_count = count - IP6_SFBLOCK;
 406                 if (psl) {
 407                         for (i=0; i<psl->sl_count; i++)
 408                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 409                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 410                 }
 411                 pmc->sflist = psl = newpsl;
 412         }
 413         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 414         for (i=0; i<psl->sl_count; i++) {
 415                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 416                 if (rv == 0)
 417                         break;
 418         }
 419         if (rv == 0)            /* address already there is an error */
 420                 goto done;
 421         for (j=psl->sl_count-1; j>=i; j--)
 422                 psl->sl_addr[j+1] = psl->sl_addr[j];
 423         psl->sl_addr[i] = *source;
 424         psl->sl_count++;
 425         err = 0;
 426         /* update the interface list */
 427         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 428 done:
 429         if (pmclocked)
 430                 write_unlock(&pmc->sflock);
 431         read_unlock(&ipv6_sk_mc_lock);
 432         read_unlock_bh(&idev->lock);
 433         rcu_read_unlock();
 434         if (leavegroup)
 435                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 436         return err;
 437 }
 438
 439 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 440 {
 441         struct in6_addr *group;
 442         struct ipv6_mc_socklist *pmc;
 443         struct net_device *dev;
 444         struct inet6_dev *idev;
 445         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 446         struct ip6_sf_socklist *newpsl, *psl;
 447         struct net *net = sock_net(sk);
 448         int leavegroup = 0;
 449         int i, err;
 450
 451         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 452
 453         if (!ipv6_addr_is_multicast(group))
 454                 return -EINVAL;
 455         if (gsf->gf_fmode != MCAST_INCLUDE &&
 456             gsf->gf_fmode != MCAST_EXCLUDE)
 457                 return -EINVAL;
 458
 459         rcu_read_lock();
 460         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 461
 462         if (!idev) {
 463                 rcu_read_unlock();
 464                 return -ENODEV;
 465         }
 466         dev = idev->dev;
 467
 468         err = 0;
 469         read_lock(&ipv6_sk_mc_lock);
 470
 471         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 472                 leavegroup = 1;
 473                 goto done;
 474         }
 475
 476         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 477                 if (pmc->ifindex != gsf->gf_interface)
 478                         continue;
 479                 if (ipv6_addr_equal(&pmc->addr, group))
 480                         break;
 481         }
 482         if (!pmc) {             /* must have a prior join */
 483                 err = -EINVAL;
 484                 goto done;
 485         }
 486         if (gsf->gf_numsrc) {
 487                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 488                                                           GFP_ATOMIC);
 489                 if (!newpsl) {
 490                         err = -ENOBUFS;
 491                         goto done;
 492                 }
 493                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 494                 for (i=0; i<newpsl->sl_count; ++i) {
 495                         struct sockaddr_in6 *psin6;
 496
 497                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 498                         newpsl->sl_addr[i] = psin6->sin6_addr;
 499                 }
 500                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 501                         newpsl->sl_count, newpsl->sl_addr, 0);
 502                 if (err) {
 503                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 504                         goto done;
 505                 }
 506         } else {
 507                 newpsl = NULL;
 508                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 509         }
 510
 511         write_lock(&pmc->sflock);
 512         psl = pmc->sflist;
 513         if (psl) {
 514                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 515                         psl->sl_count, psl->sl_addr, 0);
 516                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 517         } else
 518                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 519         pmc->sflist = newpsl;
 520         pmc->sfmode = gsf->gf_fmode;
 521         write_unlock(&pmc->sflock);
 522         err = 0;
 523 done:
 524         read_unlock(&ipv6_sk_mc_lock);
 525         read_unlock_bh(&idev->lock);
 526         rcu_read_unlock();
 527         if (leavegroup)
 528                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 529         return err;
 530 }
 531
 532 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 533         struct group_filter __user *optval, int __user *optlen)
 534 {
 535         int err, i, count, copycount;
 536         struct in6_addr *group;
 537         struct ipv6_mc_socklist *pmc;
 538         struct inet6_dev *idev;
 539         struct net_device *dev;
 540         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 541         struct ip6_sf_socklist *psl;
 542         struct net *net = sock_net(sk);
 543
 544         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 545
 546         if (!ipv6_addr_is_multicast(group))
 547                 return -EINVAL;
 548
 549         rcu_read_lock();
 550         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 551
 552         if (!idev) {
 553                 rcu_read_unlock();
 554                 return -ENODEV;
 555         }
 556         dev = idev->dev;
 557
 558         err = -EADDRNOTAVAIL;
 559         /*
 560          * changes to the ipv6_mc_list require the socket lock and
 561          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 562          * so reading the list is safe.
 563          */
 564
 565         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 566                 if (pmc->ifindex != gsf->gf_interface)
 567                         continue;
 568                 if (ipv6_addr_equal(group, &pmc->addr))
 569                         break;
 570         }
 571         if (!pmc)               /* must have a prior join */
 572                 goto done;
 573         gsf->gf_fmode = pmc->sfmode;
 574         psl = pmc->sflist;
 575         count = psl ? psl->sl_count : 0;
 576         read_unlock_bh(&idev->lock);
 577         rcu_read_unlock();
 578
 579         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 580         gsf->gf_numsrc = count;
 581         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 582             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 583                 return -EFAULT;
 584         }
 585         /* changes to psl require the socket lock, a read lock on
 586          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 587          * have the socket lock, so reading here is safe.
 588          */
 589         for (i=0; i<copycount; i++) {
 590                 struct sockaddr_in6 *psin6;
 591                 struct sockaddr_storage ss;
 592
 593                 psin6 = (struct sockaddr_in6 *)&ss;
 594                 memset(&ss, 0, sizeof(ss));
 595                 psin6->sin6_family = AF_INET6;
 596                 psin6->sin6_addr = psl->sl_addr[i];
 597                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 598                         return -EFAULT;
 599         }
 600         return 0;
 601 done:
 602         read_unlock_bh(&idev->lock);
 603         rcu_read_unlock();
 604         return err;
 605 }
 606
 607 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 608                    const struct in6_addr *src_addr)
 609 {
 610         struct ipv6_pinfo *np = inet6_sk(sk);
 611         struct ipv6_mc_socklist *mc;
 612         struct ip6_sf_socklist *psl;
 613         int rv = 1;
 614
 615         read_lock(&ipv6_sk_mc_lock);
 616         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 617                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 618                         break;
 619         }
 620         if (!mc) {
 621                 read_unlock(&ipv6_sk_mc_lock);
 622                 return 1;
 623         }
 624         read_lock(&mc->sflock);
 625         psl = mc->sflist;
 626         if (!psl) {
 627                 rv = mc->sfmode == MCAST_EXCLUDE;
 628         } else {
 629                 int i;
 630
 631                 for (i=0; i<psl->sl_count; i++) {
 632                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 633                                 break;
 634                 }
 635                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 636                         rv = 0;
 637                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 638                         rv = 0;
 639         }
 640         read_unlock(&mc->sflock);
 641         read_unlock(&ipv6_sk_mc_lock);
 642
 643         return rv;
 644 }
 645
 646 static void ma_put(struct ifmcaddr6 *mc)
 647 {
 648         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 649                 in6_dev_put(mc->idev);
 650                 kfree(mc);
 651         }
 652 }
 653
 654 static void igmp6_group_added(struct ifmcaddr6 *mc)
 655 {
 656         struct net_device *dev = mc->idev->dev;
 657         char buf[MAX_ADDR_LEN];
 658
 659         spin_lock_bh(&mc->mca_lock);
 660         if (!(mc->mca_flags&MAF_LOADED)) {
 661                 mc->mca_flags |= MAF_LOADED;
 662                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 663                         dev_mc_add(dev, buf);
 664         }
 665         spin_unlock_bh(&mc->mca_lock);
 666
 667         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 668                 return;
 669
 670         if (MLD_V1_SEEN(mc->idev)) {
 671                 igmp6_join_group(mc);
 672                 return;
 673         }
 674         /* else v2 */
 675
 676         mc->mca_crcount = mc->idev->mc_qrv;
 677         mld_ifc_event(mc->idev);
 678 }
 679
 680 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 681 {
 682         struct net_device *dev = mc->idev->dev;
 683         char buf[MAX_ADDR_LEN];
 684
 685         spin_lock_bh(&mc->mca_lock);
 686         if (mc->mca_flags&MAF_LOADED) {
 687                 mc->mca_flags &= ~MAF_LOADED;
 688                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 689                         dev_mc_del(dev, buf);
 690         }
 691
 692         if (mc->mca_flags & MAF_NOREPORT)
 693                 goto done;
 694         spin_unlock_bh(&mc->mca_lock);
 695
 696         if (!mc->idev->dead)
 697                 igmp6_leave_group(mc);
 698
 699         spin_lock_bh(&mc->mca_lock);
 700         if (del_timer(&mc->mca_timer))
 701                 atomic_dec(&mc->mca_refcnt);
 702 done:
 703         ip6_mc_clear_src(mc);
 704         spin_unlock_bh(&mc->mca_lock);
 705 }
 706
 707 /*
 708  * deleted ifmcaddr6 manipulation
 709  */
 710 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 711 {
 712         struct ifmcaddr6 *pmc;
 713
 714         /* this is an "ifmcaddr6" for convenience; only the fields below
 715          * are actually used. In particular, the refcnt and users are not
 716          * used for management of the delete list. Using the same structure
 717          * for deleted items allows change reports to use common code with
 718          * non-deleted or query-response MCA's.
 719          */
 720         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 721         if (!pmc)
 722                 return;
 723
 724         spin_lock_bh(&im->mca_lock);
 725         spin_lock_init(&pmc->mca_lock);
 726         pmc->idev = im->idev;
 727         in6_dev_hold(idev);
 728         pmc->mca_addr = im->mca_addr;
 729         pmc->mca_crcount = idev->mc_qrv;
 730         pmc->mca_sfmode = im->mca_sfmode;
 731         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 732                 struct ip6_sf_list *psf;
 733
 734                 pmc->mca_tomb = im->mca_tomb;
 735                 pmc->mca_sources = im->mca_sources;
 736                 im->mca_tomb = im->mca_sources = NULL;
 737                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 738                         psf->sf_crcount = pmc->mca_crcount;
 739         }
 740         spin_unlock_bh(&im->mca_lock);
 741
 742         spin_lock_bh(&idev->mc_lock);
 743         pmc->next = idev->mc_tomb;
 744         idev->mc_tomb = pmc;
 745         spin_unlock_bh(&idev->mc_lock);
 746 }
 747
 748 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 749 {
 750         struct ifmcaddr6 *pmc, *pmc_prev;
 751         struct ip6_sf_list *psf, *psf_next;
 752
 753         spin_lock_bh(&idev->mc_lock);
 754         pmc_prev = NULL;
 755         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 756                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 757                         break;
 758                 pmc_prev = pmc;
 759         }
 760         if (pmc) {
 761                 if (pmc_prev)
 762                         pmc_prev->next = pmc->next;
 763                 else
 764                         idev->mc_tomb = pmc->next;
 765         }
 766         spin_unlock_bh(&idev->mc_lock);
 767
 768         if (pmc) {
 769                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 770                         psf_next = psf->sf_next;
 771                         kfree(psf);
 772                 }
 773                 in6_dev_put(pmc->idev);
 774                 kfree(pmc);
 775         }
 776 }
 777
 778 static void mld_clear_delrec(struct inet6_dev *idev)
 779 {
 780         struct ifmcaddr6 *pmc, *nextpmc;
 781
 782         spin_lock_bh(&idev->mc_lock);
 783         pmc = idev->mc_tomb;
 784         idev->mc_tomb = NULL;
 785         spin_unlock_bh(&idev->mc_lock);
 786
 787         for (; pmc; pmc = nextpmc) {
 788                 nextpmc = pmc->next;
 789                 ip6_mc_clear_src(pmc);
 790                 in6_dev_put(pmc->idev);
 791                 kfree(pmc);
 792         }
 793
 794         /* clear dead sources, too */
 795         read_lock_bh(&idev->lock);
 796         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 797                 struct ip6_sf_list *psf, *psf_next;
 798
 799                 spin_lock_bh(&pmc->mca_lock);
 800                 psf = pmc->mca_tomb;
 801                 pmc->mca_tomb = NULL;
 802                 spin_unlock_bh(&pmc->mca_lock);
 803                 for (; psf; psf=psf_next) {
 804                         psf_next = psf->sf_next;
 805                         kfree(psf);
 806                 }
 807         }
 808         read_unlock_bh(&idev->lock);
 809 }
 810
 811
 812 /*
 813  *      device multicast group inc (add if not found)
 814  */
 815 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 816 {
 817         struct ifmcaddr6 *mc;
 818         struct inet6_dev *idev;
 819
 820         /* we need to take a reference on idev */
 821         idev = in6_dev_get(dev);
 822
 823         if (idev == NULL)
 824                 return -EINVAL;
 825
 826         write_lock_bh(&idev->lock);
 827         if (idev->dead) {
 828                 write_unlock_bh(&idev->lock);
 829                 in6_dev_put(idev);
 830                 return -ENODEV;
 831         }
 832
 833         for (mc = idev->mc_list; mc; mc = mc->next) {
 834                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 835                         mc->mca_users++;
 836                         write_unlock_bh(&idev->lock);
 837                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 838                                 NULL, 0);
 839                         in6_dev_put(idev);
 840                         return 0;
 841                 }
 842         }
 843
 844         /*
 845          *      not found: create a new one.
 846          */
 847
 848         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 849
 850         if (mc == NULL) {
 851                 write_unlock_bh(&idev->lock);
 852                 in6_dev_put(idev);
 853                 return -ENOMEM;
 854         }
 855
 856         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 857
 858         ipv6_addr_copy(&mc->mca_addr, addr);
 859         mc->idev = idev; /* (reference taken) */
 860         mc->mca_users = 1;
 861         /* mca_stamp should be updated upon changes */
 862         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 863         atomic_set(&mc->mca_refcnt, 2);
 864         spin_lock_init(&mc->mca_lock);
 865
 866         /* initial mode is (EX, empty) */
 867         mc->mca_sfmode = MCAST_EXCLUDE;
 868         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 869
 870         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 871             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 872                 mc->mca_flags |= MAF_NOREPORT;
 873
 874         mc->next = idev->mc_list;
 875         idev->mc_list = mc;
 876         write_unlock_bh(&idev->lock);
 877
 878         mld_del_delrec(idev, &mc->mca_addr);
 879         igmp6_group_added(mc);
 880         ma_put(mc);
 881         return 0;
 882 }
 883
 884 /*
 885  *      device multicast group del
 886  */
 887 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 888 {
 889         struct ifmcaddr6 *ma, **map;
 890
 891         write_lock_bh(&idev->lock);
 892         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 893                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 894                         if (--ma->mca_users == 0) {
 895                                 *map = ma->next;
 896                                 write_unlock_bh(&idev->lock);
 897
 898                                 igmp6_group_dropped(ma);
 899
 900                                 ma_put(ma);
 901                                 return 0;
 902                         }
 903                         write_unlock_bh(&idev->lock);
 904                         return 0;
 905                 }
 906         }
 907         write_unlock_bh(&idev->lock);
 908
 909         return -ENOENT;
 910 }
 911
 912 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 913 {
 914         struct inet6_dev *idev;
 915         int err;
 916
 917         rcu_read_lock();
 918
 919         idev = __in6_dev_get(dev);
 920         if (!idev)
 921                 err = -ENODEV;
 922         else
 923                 err = __ipv6_dev_mc_dec(idev, addr);
 924
 925         rcu_read_unlock();
 926         return err;
 927 }
 928
 929 /*
 930  * identify MLD packets for MLD filter exceptions
 931  */
 932 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 933 {
 934         struct icmp6hdr *pic;
 935
 936         if (nexthdr != IPPROTO_ICMPV6)
 937                 return 0;
 938
 939         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 940                 return 0;
 941
 942         pic = icmp6_hdr(skb);
 943
 944         switch (pic->icmp6_type) {
 945         case ICMPV6_MGM_QUERY:
 946         case ICMPV6_MGM_REPORT:
 947         case ICMPV6_MGM_REDUCTION:
 948         case ICMPV6_MLD2_REPORT:
 949                 return 1;
 950         default:
 951                 break;
 952         }
 953         return 0;
 954 }
 955
 956 /*
 957  *      check if the interface/address pair is valid
 958  */
 959 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 960                         const struct in6_addr *src_addr)
 961 {
 962         struct inet6_dev *idev;
 963         struct ifmcaddr6 *mc;
 964         int rv = 0;
 965
 966         rcu_read_lock();
 967         idev = __in6_dev_get(dev);
 968         if (idev) {
 969                 read_lock_bh(&idev->lock);
 970                 for (mc = idev->mc_list; mc; mc=mc->next) {
 971                         if (ipv6_addr_equal(&mc->mca_addr, group))
 972                                 break;
 973                 }
 974                 if (mc) {
 975                         if (src_addr && !ipv6_addr_any(src_addr)) {
 976                                 struct ip6_sf_list *psf;
 977
 978                                 spin_lock_bh(&mc->mca_lock);
 979                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 980                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 981                                                 break;
 982                                 }
 983                                 if (psf)
 984                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 985                                                 psf->sf_count[MCAST_EXCLUDE] !=
 986                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 987                                 else
 988                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 989                                 spin_unlock_bh(&mc->mca_lock);
 990                         } else
 991                                 rv = 1; /* don't filter unspecified source */
 992                 }
 993                 read_unlock_bh(&idev->lock);
 994         }
 995         rcu_read_unlock();
 996         return rv;
 997 }
 998
 999 static void mld_gq_start_timer(struct inet6_dev *idev)
1000 {
1001         int tv = net_random() % idev->mc_maxdelay;
1002
1003         idev->mc_gq_running = 1;
1004         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1005                 in6_dev_hold(idev);
1006 }
1007
1008 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1009 {
1010         int tv = net_random() % delay;
1011
1012         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1013                 in6_dev_hold(idev);
1014 }
1015
1016 /*
1017  *      IGMP handling (alias multicast ICMPv6 messages)
1018  */
1019
1020 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1021 {
1022         unsigned long delay = resptime;
1023
1024         /* Do not start timer for these addresses */
1025         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1026             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1027                 return;
1028
1029         if (del_timer(&ma->mca_timer)) {
1030                 atomic_dec(&ma->mca_refcnt);
1031                 delay = ma->mca_timer.expires - jiffies;
1032         }
1033
1034         if (delay >= resptime) {
1035                 if (resptime)
1036                         delay = net_random() % resptime;
1037                 else
1038                         delay = 1;
1039         }
1040         ma->mca_timer.expires = jiffies + delay;
1041         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1042                 atomic_inc(&ma->mca_refcnt);
1043         ma->mca_flags |= MAF_TIMER_RUNNING;
1044 }
1045
1046 /* mark EXCLUDE-mode sources */
1047 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1048         struct in6_addr *srcs)
1049 {
1050         struct ip6_sf_list *psf;
1051         int i, scount;
1052
1053         scount = 0;
1054         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1055                 if (scount == nsrcs)
1056                         break;
1057                 for (i=0; i<nsrcs; i++) {
1058                         /* skip inactive filters */
1059                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1060                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1061                             psf->sf_count[MCAST_EXCLUDE])
1062                                 continue;
1063                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1064                                 scount++;
1065                                 break;
1066                         }
1067                 }
1068         }
1069         pmc->mca_flags &= ~MAF_GSQUERY;
1070         if (scount == nsrcs)    /* all sources excluded */
1071                 return 0;
1072         return 1;
1073 }
1074
1075 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1076         struct in6_addr *srcs)
1077 {
1078         struct ip6_sf_list *psf;
1079         int i, scount;
1080
1081         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1082                 return mld_xmarksources(pmc, nsrcs, srcs);
1083
1084         /* mark INCLUDE-mode sources */
1085
1086         scount = 0;
1087         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1088                 if (scount == nsrcs)
1089                         break;
1090                 for (i=0; i<nsrcs; i++) {
1091                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1092                                 psf->sf_gsresp = 1;
1093                                 scount++;
1094                                 break;
1095                         }
1096                 }
1097         }
1098         if (!scount) {
1099                 pmc->mca_flags &= ~MAF_GSQUERY;
1100                 return 0;
1101         }
1102         pmc->mca_flags |= MAF_GSQUERY;
1103         return 1;
1104 }
1105
1106 /* called with rcu_read_lock() */
1107 int igmp6_event_query(struct sk_buff *skb)
1108 {
1109         struct mld2_query *mlh2 = NULL;
1110         struct ifmcaddr6 *ma;
1111         struct in6_addr *group;
1112         unsigned long max_delay;
1113         struct inet6_dev *idev;
1114         struct mld_msg *mld;
1115         int group_type;
1116         int mark = 0;
1117         int len;
1118
1119         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1120                 return -EINVAL;
1121
1122         /* compute payload length excluding extension headers */
1123         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1124         len -= skb_network_header_len(skb);
1125
1126         /* Drop queries with not link local source */
1127         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1128                 return -EINVAL;
1129
1130         idev = __in6_dev_get(skb->dev);
1131
1132         if (idev == NULL)
1133                 return 0;
1134
1135         mld = (struct mld_msg *)icmp6_hdr(skb);
1136         group = &mld->mld_mca;
1137         group_type = ipv6_addr_type(group);
1138
1139         if (group_type != IPV6_ADDR_ANY &&
1140             !(group_type&IPV6_ADDR_MULTICAST))
1141                 return -EINVAL;
1142
1143         if (len == 24) {
1144                 int switchback;
1145                 /* MLDv1 router present */
1146
1147                 /* Translate milliseconds to jiffies */
1148                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1149
1150                 switchback = (idev->mc_qrv + 1) * max_delay;
1151                 idev->mc_v1_seen = jiffies + switchback;
1152
1153                 /* cancel the interface change timer */
1154                 idev->mc_ifc_count = 0;
1155                 if (del_timer(&idev->mc_ifc_timer))
1156                         __in6_dev_put(idev);
1157                 /* clear deleted report items */
1158                 mld_clear_delrec(idev);
1159         } else if (len >= 28) {
1160                 int srcs_offset = sizeof(struct mld2_query) -
1161                                   sizeof(struct icmp6hdr);
1162                 if (!pskb_may_pull(skb, srcs_offset))
1163                         return -EINVAL;
1164
1165                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1166                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1167                 if (!max_delay)
1168                         max_delay = 1;
1169                 idev->mc_maxdelay = max_delay;
1170                 if (mlh2->mld2q_qrv)
1171                         idev->mc_qrv = mlh2->mld2q_qrv;
1172                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1173                         if (mlh2->mld2q_nsrcs)
1174                                 return -EINVAL; /* no sources allowed */
1175
1176                         mld_gq_start_timer(idev);
1177                         return 0;
1178                 }
1179                 /* mark sources to include, if group & source-specific */
1180                 if (mlh2->mld2q_nsrcs != 0) {
1181                         if (!pskb_may_pull(skb, srcs_offset +
1182                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1183                                 return -EINVAL;
1184
1185                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1186                         mark = 1;
1187                 }
1188         } else
1189                 return -EINVAL;
1190
1191         read_lock_bh(&idev->lock);
1192         if (group_type == IPV6_ADDR_ANY) {
1193                 for (ma = idev->mc_list; ma; ma=ma->next) {
1194                         spin_lock_bh(&ma->mca_lock);
1195                         igmp6_group_queried(ma, max_delay);
1196                         spin_unlock_bh(&ma->mca_lock);
1197                 }
1198         } else {
1199                 for (ma = idev->mc_list; ma; ma=ma->next) {
1200                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1201                                 continue;
1202                         spin_lock_bh(&ma->mca_lock);
1203                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1204                                 /* gsquery <- gsquery && mark */
1205                                 if (!mark)
1206                                         ma->mca_flags &= ~MAF_GSQUERY;
1207                         } else {
1208                                 /* gsquery <- mark */
1209                                 if (mark)
1210                                         ma->mca_flags |= MAF_GSQUERY;
1211                                 else
1212                                         ma->mca_flags &= ~MAF_GSQUERY;
1213                         }
1214                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1215                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1216                                 igmp6_group_queried(ma, max_delay);
1217                         spin_unlock_bh(&ma->mca_lock);
1218                         break;
1219                 }
1220         }
1221         read_unlock_bh(&idev->lock);
1222
1223         return 0;
1224 }
1225
1226 /* called with rcu_read_lock() */
1227 int igmp6_event_report(struct sk_buff *skb)
1228 {
1229         struct ifmcaddr6 *ma;
1230         struct inet6_dev *idev;
1231         struct mld_msg *mld;
1232         int addr_type;
1233
1234         /* Our own report looped back. Ignore it. */
1235         if (skb->pkt_type == PACKET_LOOPBACK)
1236                 return 0;
1237
1238         /* send our report if the MC router may not have heard this report */
1239         if (skb->pkt_type != PACKET_MULTICAST &&
1240             skb->pkt_type != PACKET_BROADCAST)
1241                 return 0;
1242
1243         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1244                 return -EINVAL;
1245
1246         mld = (struct mld_msg *)icmp6_hdr(skb);
1247
1248         /* Drop reports with not link local source */
1249         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1250         if (addr_type != IPV6_ADDR_ANY &&
1251             !(addr_type&IPV6_ADDR_LINKLOCAL))
1252                 return -EINVAL;
1253
1254         idev = __in6_dev_get(skb->dev);
1255         if (idev == NULL)
1256                 return -ENODEV;
1257
1258         /*
1259          *      Cancel the timer for this group
1260          */
1261
1262         read_lock_bh(&idev->lock);
1263         for (ma = idev->mc_list; ma; ma=ma->next) {
1264                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1265                         spin_lock(&ma->mca_lock);
1266                         if (del_timer(&ma->mca_timer))
1267                                 atomic_dec(&ma->mca_refcnt);
1268                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1269                         spin_unlock(&ma->mca_lock);
1270                         break;
1271                 }
1272         }
1273         read_unlock_bh(&idev->lock);
1274         return 0;
1275 }
1276
1277 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1278         int gdeleted, int sdeleted)
1279 {
1280         switch (type) {
1281         case MLD2_MODE_IS_INCLUDE:
1282         case MLD2_MODE_IS_EXCLUDE:
1283                 if (gdeleted || sdeleted)
1284                         return 0;
1285                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1286                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1287                                 return 1;
1288                         /* don't include if this source is excluded
1289                          * in all filters
1290                          */
1291                         if (psf->sf_count[MCAST_INCLUDE])
1292                                 return type == MLD2_MODE_IS_INCLUDE;
1293                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1294                                 psf->sf_count[MCAST_EXCLUDE];
1295                 }
1296                 return 0;
1297         case MLD2_CHANGE_TO_INCLUDE:
1298                 if (gdeleted || sdeleted)
1299                         return 0;
1300                 return psf->sf_count[MCAST_INCLUDE] != 0;
1301         case MLD2_CHANGE_TO_EXCLUDE:
1302                 if (gdeleted || sdeleted)
1303                         return 0;
1304                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1305                     psf->sf_count[MCAST_INCLUDE])
1306                         return 0;
1307                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1308                         psf->sf_count[MCAST_EXCLUDE];
1309         case MLD2_ALLOW_NEW_SOURCES:
1310                 if (gdeleted || !psf->sf_crcount)
1311                         return 0;
1312                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1313         case MLD2_BLOCK_OLD_SOURCES:
1314                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1315                         return gdeleted || (psf->sf_crcount && sdeleted);
1316                 return psf->sf_crcount && !gdeleted && !sdeleted;
1317         }
1318         return 0;
1319 }
1320
1321 static int
1322 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1323 {
1324         struct ip6_sf_list *psf;
1325         int scount = 0;
1326
1327         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1328                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1329                         continue;
1330                 scount++;
1331         }
1332         return scount;
1333 }
1334
1335 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1336 {
1337         struct net *net = dev_net(dev);
1338         struct sock *sk = net->ipv6.igmp_sk;
1339         struct sk_buff *skb;
1340         struct mld2_report *pmr;
1341         struct in6_addr addr_buf;
1342         const struct in6_addr *saddr;
1343         int err;
1344         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1345                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1346                      IPV6_TLV_PADN, 0 };
1347
1348         /* we assume size > sizeof(ra) here */
1349         size += LL_ALLOCATED_SPACE(dev);
1350         /* limit our allocations to order-0 page */
1351         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1352         skb = sock_alloc_send_skb(sk, size, 1, &err);
1353
1354         if (!skb)
1355                 return NULL;
1356
1357         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1358
1359         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1360                 /* <draft-ietf-magma-mld-source-05.txt>:
1361                  * use unspecified address as the source address
1362                  * when a valid link-local address is not available.
1363                  */
1364                 saddr = &in6addr_any;
1365         } else
1366                 saddr = &addr_buf;
1367
1368         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1369
1370         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1371
1372         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1373         skb_put(skb, sizeof(*pmr));
1374         pmr = (struct mld2_report *)skb_transport_header(skb);
1375         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1376         pmr->mld2r_resv1 = 0;
1377         pmr->mld2r_cksum = 0;
1378         pmr->mld2r_resv2 = 0;
1379         pmr->mld2r_ngrec = 0;
1380         return skb;
1381 }
1382
1383 static void mld_sendpack(struct sk_buff *skb)
1384 {
1385         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1386         struct mld2_report *pmr =
1387                               (struct mld2_report *)skb_transport_header(skb);
1388         int payload_len, mldlen;
1389         struct inet6_dev *idev;
1390         struct net *net = dev_net(skb->dev);
1391         int err;
1392         struct flowi fl;
1393         struct dst_entry *dst;
1394
1395         rcu_read_lock();
1396         idev = __in6_dev_get(skb->dev);
1397         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1398
1399         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1400         mldlen = skb->tail - skb->transport_header;
1401         pip6->payload_len = htons(payload_len);
1402
1403         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1404                                            IPPROTO_ICMPV6,
1405                                            csum_partial(skb_transport_header(skb),
1406                                                         mldlen, 0));
1407
1408         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1409
1410         if (!dst) {
1411                 err = -ENOMEM;
1412                 goto err_out;
1413         }
1414
1415         icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1416                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1417                          skb->dev->ifindex);
1418
1419         err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1420         skb_dst_set(skb, dst);
1421         if (err)
1422                 goto err_out;
1423
1424         payload_len = skb->len;
1425
1426         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1427                       dst_output);
1428 out:
1429         if (!err) {
1430                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1431                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1432                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1433         } else
1434                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1435
1436         rcu_read_unlock();
1437         return;
1438
1439 err_out:
1440         kfree_skb(skb);
1441         goto out;
1442 }
1443
1444 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1445 {
1446         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1447 }
1448
1449 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1450         int type, struct mld2_grec **ppgr)
1451 {
1452         struct net_device *dev = pmc->idev->dev;
1453         struct mld2_report *pmr;
1454         struct mld2_grec *pgr;
1455
1456         if (!skb)
1457                 skb = mld_newpack(dev, dev->mtu);
1458         if (!skb)
1459                 return NULL;
1460         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1461         pgr->grec_type = type;
1462         pgr->grec_auxwords = 0;
1463         pgr->grec_nsrcs = 0;
1464         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1465         pmr = (struct mld2_report *)skb_transport_header(skb);
1466         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1467         *ppgr = pgr;
1468         return skb;
1469 }
1470
1471 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1472         skb_tailroom(skb)) : 0)
1473
1474 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1475         int type, int gdeleted, int sdeleted)
1476 {
1477         struct net_device *dev = pmc->idev->dev;
1478         struct mld2_report *pmr;
1479         struct mld2_grec *pgr = NULL;
1480         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1481         int scount, stotal, first, isquery, truncate;
1482
1483         if (pmc->mca_flags & MAF_NOREPORT)
1484                 return skb;
1485
1486         isquery = type == MLD2_MODE_IS_INCLUDE ||
1487                   type == MLD2_MODE_IS_EXCLUDE;
1488         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1489                     type == MLD2_CHANGE_TO_EXCLUDE;
1490
1491         stotal = scount = 0;
1492
1493         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1494
1495         if (!*psf_list)
1496                 goto empty_source;
1497
1498         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1499
1500         /* EX and TO_EX get a fresh packet, if needed */
1501         if (truncate) {
1502                 if (pmr && pmr->mld2r_ngrec &&
1503                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1504                         if (skb)
1505                                 mld_sendpack(skb);
1506                         skb = mld_newpack(dev, dev->mtu);
1507                 }
1508         }
1509         first = 1;
1510         psf_prev = NULL;
1511         for (psf=*psf_list; psf; psf=psf_next) {
1512                 struct in6_addr *psrc;
1513
1514                 psf_next = psf->sf_next;
1515
1516                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1517                         psf_prev = psf;
1518                         continue;
1519                 }
1520
1521                 /* clear marks on query responses */
1522                 if (isquery)
1523                         psf->sf_gsresp = 0;
1524
1525                 if (AVAILABLE(skb) < sizeof(*psrc) +
1526                     first*sizeof(struct mld2_grec)) {
1527                         if (truncate && !first)
1528                                 break;   /* truncate these */
1529                         if (pgr)
1530                                 pgr->grec_nsrcs = htons(scount);
1531                         if (skb)
1532                                 mld_sendpack(skb);
1533                         skb = mld_newpack(dev, dev->mtu);
1534                         first = 1;
1535                         scount = 0;
1536                 }
1537                 if (first) {
1538                         skb = add_grhead(skb, pmc, type, &pgr);
1539                         first = 0;
1540                 }
1541                 if (!skb)
1542                         return NULL;
1543                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1544                 *psrc = psf->sf_addr;
1545                 scount++; stotal++;
1546                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1547                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1548                         psf->sf_crcount--;
1549                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1550                                 if (psf_prev)
1551                                         psf_prev->sf_next = psf->sf_next;
1552                                 else
1553                                         *psf_list = psf->sf_next;
1554                                 kfree(psf);
1555                                 continue;
1556                         }
1557                 }
1558                 psf_prev = psf;
1559         }
1560
1561 empty_source:
1562         if (!stotal) {
1563                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1564                     type == MLD2_BLOCK_OLD_SOURCES)
1565                         return skb;
1566                 if (pmc->mca_crcount || isquery) {
1567                         /* make sure we have room for group header */
1568                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1569                                 mld_sendpack(skb);
1570                                 skb = NULL; /* add_grhead will get a new one */
1571                         }
1572                         skb = add_grhead(skb, pmc, type, &pgr);
1573                 }
1574         }
1575         if (pgr)
1576                 pgr->grec_nsrcs = htons(scount);
1577
1578         if (isquery)
1579                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1580         return skb;
1581 }
1582
1583 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1584 {
1585         struct sk_buff *skb = NULL;
1586         int type;
1587
1588         if (!pmc) {
1589                 read_lock_bh(&idev->lock);
1590                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1591                         if (pmc->mca_flags & MAF_NOREPORT)
1592                                 continue;
1593                         spin_lock_bh(&pmc->mca_lock);
1594                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1595                                 type = MLD2_MODE_IS_EXCLUDE;
1596                         else
1597                                 type = MLD2_MODE_IS_INCLUDE;
1598                         skb = add_grec(skb, pmc, type, 0, 0);
1599                         spin_unlock_bh(&pmc->mca_lock);
1600                 }
1601                 read_unlock_bh(&idev->lock);
1602         } else {
1603                 spin_lock_bh(&pmc->mca_lock);
1604                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1605                         type = MLD2_MODE_IS_EXCLUDE;
1606                 else
1607                         type = MLD2_MODE_IS_INCLUDE;
1608                 skb = add_grec(skb, pmc, type, 0, 0);
1609                 spin_unlock_bh(&pmc->mca_lock);
1610         }
1611         if (skb)
1612                 mld_sendpack(skb);
1613 }
1614
1615 /*
1616  * remove zero-count source records from a source filter list
1617  */
1618 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1619 {
1620         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1621
1622         psf_prev = NULL;
1623         for (psf=*ppsf; psf; psf = psf_next) {
1624                 psf_next = psf->sf_next;
1625                 if (psf->sf_crcount == 0) {
1626                         if (psf_prev)
1627                                 psf_prev->sf_next = psf->sf_next;
1628                         else
1629                                 *ppsf = psf->sf_next;
1630                         kfree(psf);
1631                 } else
1632                         psf_prev = psf;
1633         }
1634 }
1635
1636 static void mld_send_cr(struct inet6_dev *idev)
1637 {
1638         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1639         struct sk_buff *skb = NULL;
1640         int type, dtype;
1641
1642         read_lock_bh(&idev->lock);
1643         spin_lock(&idev->mc_lock);
1644
1645         /* deleted MCA's */
1646         pmc_prev = NULL;
1647         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1648                 pmc_next = pmc->next;
1649                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1650                         type = MLD2_BLOCK_OLD_SOURCES;
1651                         dtype = MLD2_BLOCK_OLD_SOURCES;
1652                         skb = add_grec(skb, pmc, type, 1, 0);
1653                         skb = add_grec(skb, pmc, dtype, 1, 1);
1654                 }
1655                 if (pmc->mca_crcount) {
1656                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1657                                 type = MLD2_CHANGE_TO_INCLUDE;
1658                                 skb = add_grec(skb, pmc, type, 1, 0);
1659                         }
1660                         pmc->mca_crcount--;
1661                         if (pmc->mca_crcount == 0) {
1662                                 mld_clear_zeros(&pmc->mca_tomb);
1663                                 mld_clear_zeros(&pmc->mca_sources);
1664                         }
1665                 }
1666                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1667                     !pmc->mca_sources) {
1668                         if (pmc_prev)
1669                                 pmc_prev->next = pmc_next;
1670                         else
1671                                 idev->mc_tomb = pmc_next;
1672                         in6_dev_put(pmc->idev);
1673                         kfree(pmc);
1674                 } else
1675                         pmc_prev = pmc;
1676         }
1677         spin_unlock(&idev->mc_lock);
1678
1679         /* change recs */
1680         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1681                 spin_lock_bh(&pmc->mca_lock);
1682                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1683                         type = MLD2_BLOCK_OLD_SOURCES;
1684                         dtype = MLD2_ALLOW_NEW_SOURCES;
1685                 } else {
1686                         type = MLD2_ALLOW_NEW_SOURCES;
1687                         dtype = MLD2_BLOCK_OLD_SOURCES;
1688                 }
1689                 skb = add_grec(skb, pmc, type, 0, 0);
1690                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1691
1692                 /* filter mode changes */
1693                 if (pmc->mca_crcount) {
1694                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1695                                 type = MLD2_CHANGE_TO_EXCLUDE;
1696                         else
1697                                 type = MLD2_CHANGE_TO_INCLUDE;
1698                         skb = add_grec(skb, pmc, type, 0, 0);
1699                         pmc->mca_crcount--;
1700                 }
1701                 spin_unlock_bh(&pmc->mca_lock);
1702         }
1703         read_unlock_bh(&idev->lock);
1704         if (!skb)
1705                 return;
1706         (void) mld_sendpack(skb);
1707 }
1708
1709 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1710 {
1711         struct net *net = dev_net(dev);
1712         struct sock *sk = net->ipv6.igmp_sk;
1713         struct inet6_dev *idev;
1714         struct sk_buff *skb;
1715         struct mld_msg *hdr;
1716         const struct in6_addr *snd_addr, *saddr;
1717         struct in6_addr addr_buf;
1718         int err, len, payload_len, full_len;
1719         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1720                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1721                      IPV6_TLV_PADN, 0 };
1722         struct flowi fl;
1723         struct dst_entry *dst;
1724
1725         if (type == ICMPV6_MGM_REDUCTION)
1726                 snd_addr = &in6addr_linklocal_allrouters;
1727         else
1728                 snd_addr = addr;
1729
1730         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1731         payload_len = len + sizeof(ra);
1732         full_len = sizeof(struct ipv6hdr) + payload_len;
1733
1734         rcu_read_lock();
1735         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1736                       IPSTATS_MIB_OUT, full_len);
1737         rcu_read_unlock();
1738
1739         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1740
1741         if (skb == NULL) {
1742                 rcu_read_lock();
1743                 IP6_INC_STATS(net, __in6_dev_get(dev),
1744                               IPSTATS_MIB_OUTDISCARDS);
1745                 rcu_read_unlock();
1746                 return;
1747         }
1748
1749         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1750
1751         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1752                 /* <draft-ietf-magma-mld-source-05.txt>:
1753                  * use unspecified address as the source address
1754                  * when a valid link-local address is not available.
1755                  */
1756                 saddr = &in6addr_any;
1757         } else
1758                 saddr = &addr_buf;
1759
1760         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1761
1762         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1763
1764         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1765         memset(hdr, 0, sizeof(struct mld_msg));
1766         hdr->mld_type = type;
1767         ipv6_addr_copy(&hdr->mld_mca, addr);
1768
1769         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1770                                          IPPROTO_ICMPV6,
1771                                          csum_partial(hdr, len, 0));
1772
1773         rcu_read_lock();
1774         idev = __in6_dev_get(skb->dev);
1775
1776         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1777         if (!dst) {
1778                 err = -ENOMEM;
1779                 goto err_out;
1780         }
1781
1782         icmpv6_flow_init(sk, &fl, type,
1783                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1784                          skb->dev->ifindex);
1785
1786         err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1787         if (err)
1788                 goto err_out;
1789
1790         skb_dst_set(skb, dst);
1791         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1792                       dst_output);
1793 out:
1794         if (!err) {
1795                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1796                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1797                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1798         } else
1799                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1800
1801         rcu_read_unlock();
1802         return;
1803
1804 err_out:
1805         kfree_skb(skb);
1806         goto out;
1807 }
1808
1809 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1810         struct in6_addr *psfsrc)
1811 {
1812         struct ip6_sf_list *psf, *psf_prev;
1813         int rv = 0;
1814
1815         psf_prev = NULL;
1816         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1817                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1818                         break;
1819                 psf_prev = psf;
1820         }
1821         if (!psf || psf->sf_count[sfmode] == 0) {
1822                 /* source filter not found, or count wrong =>  bug */
1823                 return -ESRCH;
1824         }
1825         psf->sf_count[sfmode]--;
1826         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1827                 struct inet6_dev *idev = pmc->idev;
1828
1829                 /* no more filters for this source */
1830                 if (psf_prev)
1831                         psf_prev->sf_next = psf->sf_next;
1832                 else
1833                         pmc->mca_sources = psf->sf_next;
1834                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1835                     !MLD_V1_SEEN(idev)) {
1836                         psf->sf_crcount = idev->mc_qrv;
1837                         psf->sf_next = pmc->mca_tomb;
1838                         pmc->mca_tomb = psf;
1839                         rv = 1;
1840                 } else
1841                         kfree(psf);
1842         }
1843         return rv;
1844 }
1845
1846 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1847                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1848                           int delta)
1849 {
1850         struct ifmcaddr6 *pmc;
1851         int     changerec = 0;
1852         int     i, err;
1853
1854         if (!idev)
1855                 return -ENODEV;
1856         read_lock_bh(&idev->lock);
1857         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1858                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1859                         break;
1860         }
1861         if (!pmc) {
1862                 /* MCA not found?? bug */
1863                 read_unlock_bh(&idev->lock);
1864                 return -ESRCH;
1865         }
1866         spin_lock_bh(&pmc->mca_lock);
1867         sf_markstate(pmc);
1868         if (!delta) {
1869                 if (!pmc->mca_sfcount[sfmode]) {
1870                         spin_unlock_bh(&pmc->mca_lock);
1871                         read_unlock_bh(&idev->lock);
1872                         return -EINVAL;
1873                 }
1874                 pmc->mca_sfcount[sfmode]--;
1875         }
1876         err = 0;
1877         for (i=0; i<sfcount; i++) {
1878                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1879
1880                 changerec |= rv > 0;
1881                 if (!err && rv < 0)
1882                         err = rv;
1883         }
1884         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1885             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1886             pmc->mca_sfcount[MCAST_INCLUDE]) {
1887                 struct ip6_sf_list *psf;
1888
1889                 /* filter mode change */
1890                 pmc->mca_sfmode = MCAST_INCLUDE;
1891                 pmc->mca_crcount = idev->mc_qrv;
1892                 idev->mc_ifc_count = pmc->mca_crcount;
1893                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1894                         psf->sf_crcount = 0;
1895                 mld_ifc_event(pmc->idev);
1896         } else if (sf_setstate(pmc) || changerec)
1897                 mld_ifc_event(pmc->idev);
1898         spin_unlock_bh(&pmc->mca_lock);
1899         read_unlock_bh(&idev->lock);
1900         return err;
1901 }
1902
1903 /*
1904  * Add multicast single-source filter to the interface list
1905  */
1906 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1907         struct in6_addr *psfsrc, int delta)
1908 {
1909         struct ip6_sf_list *psf, *psf_prev;
1910
1911         psf_prev = NULL;
1912         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1913                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1914                         break;
1915                 psf_prev = psf;
1916         }
1917         if (!psf) {
1918                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1919                 if (!psf)
1920                         return -ENOBUFS;
1921
1922                 psf->sf_addr = *psfsrc;
1923                 if (psf_prev) {
1924                         psf_prev->sf_next = psf;
1925                 } else
1926                         pmc->mca_sources = psf;
1927         }
1928         psf->sf_count[sfmode]++;
1929         return 0;
1930 }
1931
1932 static void sf_markstate(struct ifmcaddr6 *pmc)
1933 {
1934         struct ip6_sf_list *psf;
1935         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1936
1937         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1938                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1939                         psf->sf_oldin = mca_xcount ==
1940                                 psf->sf_count[MCAST_EXCLUDE] &&
1941                                 !psf->sf_count[MCAST_INCLUDE];
1942                 } else
1943                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1944 }
1945
1946 static int sf_setstate(struct ifmcaddr6 *pmc)
1947 {
1948         struct ip6_sf_list *psf, *dpsf;
1949         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1950         int qrv = pmc->idev->mc_qrv;
1951         int new_in, rv;
1952
1953         rv = 0;
1954         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1955                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1956                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1957                                 !psf->sf_count[MCAST_INCLUDE];
1958                 } else
1959                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1960                 if (new_in) {
1961                         if (!psf->sf_oldin) {
1962                                 struct ip6_sf_list *prev = NULL;
1963
1964                                 for (dpsf=pmc->mca_tomb; dpsf;
1965                                      dpsf=dpsf->sf_next) {
1966                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1967                                             &psf->sf_addr))
1968                                                 break;
1969                                         prev = dpsf;
1970                                 }
1971                                 if (dpsf) {
1972                                         if (prev)
1973                                                 prev->sf_next = dpsf->sf_next;
1974                                         else
1975                                                 pmc->mca_tomb = dpsf->sf_next;
1976                                         kfree(dpsf);
1977                                 }
1978                                 psf->sf_crcount = qrv;
1979                                 rv++;
1980                         }
1981                 } else if (psf->sf_oldin) {
1982                         psf->sf_crcount = 0;
1983                         /*
1984                          * add or update "delete" records if an active filter
1985                          * is now inactive
1986                          */
1987                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1988                                 if (ipv6_addr_equal(&dpsf->sf_addr,
1989                                     &psf->sf_addr))
1990                                         break;
1991                         if (!dpsf) {
1992                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1993                                 if (!dpsf)
1994                                         continue;
1995                                 *dpsf = *psf;
1996                                 /* pmc->mca_lock held by callers */
1997                                 dpsf->sf_next = pmc->mca_tomb;
1998                                 pmc->mca_tomb = dpsf;
1999                         }
2000                         dpsf->sf_crcount = qrv;
2001                         rv++;
2002                 }
2003         }
2004         return rv;
2005 }
2006
2007 /*
2008  * Add multicast source filter list to the interface list
2009  */
2010 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2011                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2012                           int delta)
2013 {
2014         struct ifmcaddr6 *pmc;
2015         int     isexclude;
2016         int     i, err;
2017
2018         if (!idev)
2019                 return -ENODEV;
2020         read_lock_bh(&idev->lock);
2021         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2022                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2023                         break;
2024         }
2025         if (!pmc) {
2026                 /* MCA not found?? bug */
2027                 read_unlock_bh(&idev->lock);
2028                 return -ESRCH;
2029         }
2030         spin_lock_bh(&pmc->mca_lock);
2031
2032         sf_markstate(pmc);
2033         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2034         if (!delta)
2035                 pmc->mca_sfcount[sfmode]++;
2036         err = 0;
2037         for (i=0; i<sfcount; i++) {
2038                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2039                 if (err)
2040                         break;
2041         }
2042         if (err) {
2043                 int j;
2044
2045                 if (!delta)
2046                         pmc->mca_sfcount[sfmode]--;
2047                 for (j=0; j<i; j++)
2048                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2049         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2050                 struct ip6_sf_list *psf;
2051
2052                 /* filter mode change */
2053                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2054                         pmc->mca_sfmode = MCAST_EXCLUDE;
2055                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2056                         pmc->mca_sfmode = MCAST_INCLUDE;
2057                 /* else no filters; keep old mode for reports */
2058
2059                 pmc->mca_crcount = idev->mc_qrv;
2060                 idev->mc_ifc_count = pmc->mca_crcount;
2061                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2062                         psf->sf_crcount = 0;
2063                 mld_ifc_event(idev);
2064         } else if (sf_setstate(pmc))
2065                 mld_ifc_event(idev);
2066         spin_unlock_bh(&pmc->mca_lock);
2067         read_unlock_bh(&idev->lock);
2068         return err;
2069 }
2070
2071 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2072 {
2073         struct ip6_sf_list *psf, *nextpsf;
2074
2075         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2076                 nextpsf = psf->sf_next;
2077                 kfree(psf);
2078         }
2079         pmc->mca_tomb = NULL;
2080         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2081                 nextpsf = psf->sf_next;
2082                 kfree(psf);
2083         }
2084         pmc->mca_sources = NULL;
2085         pmc->mca_sfmode = MCAST_EXCLUDE;
2086         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2087         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2088 }
2089
2090
2091 static void igmp6_join_group(struct ifmcaddr6 *ma)
2092 {
2093         unsigned long delay;
2094
2095         if (ma->mca_flags & MAF_NOREPORT)
2096                 return;
2097
2098         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2099
2100         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2101
2102         spin_lock_bh(&ma->mca_lock);
2103         if (del_timer(&ma->mca_timer)) {
2104                 atomic_dec(&ma->mca_refcnt);
2105                 delay = ma->mca_timer.expires - jiffies;
2106         }
2107
2108         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2109                 atomic_inc(&ma->mca_refcnt);
2110         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2111         spin_unlock_bh(&ma->mca_lock);
2112 }
2113
2114 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2115                             struct inet6_dev *idev)
2116 {
2117         int err;
2118
2119         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2120          * so no other readers or writers of iml or its sflist
2121          */
2122         if (!iml->sflist) {
2123                 /* any-source empty exclude case */
2124                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2125         }
2126         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2127                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2128         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2129         iml->sflist = NULL;
2130         return err;
2131 }
2132
2133 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2134 {
2135         if (MLD_V1_SEEN(ma->idev)) {
2136                 if (ma->mca_flags & MAF_LAST_REPORTER)
2137                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2138                                 ICMPV6_MGM_REDUCTION);
2139         } else {
2140                 mld_add_delrec(ma->idev, ma);
2141                 mld_ifc_event(ma->idev);
2142         }
2143 }
2144
2145 static void mld_gq_timer_expire(unsigned long data)
2146 {
2147         struct inet6_dev *idev = (struct inet6_dev *)data;
2148
2149         idev->mc_gq_running = 0;
2150         mld_send_report(idev, NULL);
2151         __in6_dev_put(idev);
2152 }
2153
2154 static void mld_ifc_timer_expire(unsigned long data)
2155 {
2156         struct inet6_dev *idev = (struct inet6_dev *)data;
2157
2158         mld_send_cr(idev);
2159         if (idev->mc_ifc_count) {
2160                 idev->mc_ifc_count--;
2161                 if (idev->mc_ifc_count)
2162                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2163         }
2164         __in6_dev_put(idev);
2165 }
2166
2167 static void mld_ifc_event(struct inet6_dev *idev)
2168 {
2169         if (MLD_V1_SEEN(idev))
2170                 return;
2171         idev->mc_ifc_count = idev->mc_qrv;
2172         mld_ifc_start_timer(idev, 1);
2173 }
2174
2175
2176 static void igmp6_timer_handler(unsigned long data)
2177 {
2178         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2179
2180         if (MLD_V1_SEEN(ma->idev))
2181                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2182         else
2183                 mld_send_report(ma->idev, ma);
2184
2185         spin_lock(&ma->mca_lock);
2186         ma->mca_flags |=  MAF_LAST_REPORTER;
2187         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2188         spin_unlock(&ma->mca_lock);
2189         ma_put(ma);
2190 }
2191
2192 /* Device changing type */
2193
2194 void ipv6_mc_unmap(struct inet6_dev *idev)
2195 {
2196         struct ifmcaddr6 *i;
2197
2198         /* Install multicast list, except for all-nodes (already installed) */
2199
2200         read_lock_bh(&idev->lock);
2201         for (i = idev->mc_list; i; i = i->next)
2202                 igmp6_group_dropped(i);
2203         read_unlock_bh(&idev->lock);
2204 }
2205
2206 void ipv6_mc_remap(struct inet6_dev *idev)
2207 {
2208         ipv6_mc_up(idev);
2209 }
2210
2211 /* Device going down */
2212
2213 void ipv6_mc_down(struct inet6_dev *idev)
2214 {
2215         struct ifmcaddr6 *i;
2216
2217         /* Withdraw multicast list */
2218
2219         read_lock_bh(&idev->lock);
2220         idev->mc_ifc_count = 0;
2221         if (del_timer(&idev->mc_ifc_timer))
2222                 __in6_dev_put(idev);
2223         idev->mc_gq_running = 0;
2224         if (del_timer(&idev->mc_gq_timer))
2225                 __in6_dev_put(idev);
2226
2227         for (i = idev->mc_list; i; i=i->next)
2228                 igmp6_group_dropped(i);
2229         read_unlock_bh(&idev->lock);
2230
2231         mld_clear_delrec(idev);
2232 }
2233
2234
2235 /* Device going up */
2236
2237 void ipv6_mc_up(struct inet6_dev *idev)
2238 {
2239         struct ifmcaddr6 *i;
2240
2241         /* Install multicast list, except for all-nodes (already installed) */
2242
2243         read_lock_bh(&idev->lock);
2244         for (i = idev->mc_list; i; i=i->next)
2245                 igmp6_group_added(i);
2246         read_unlock_bh(&idev->lock);
2247 }
2248
2249 /* IPv6 device initialization. */
2250
2251 void ipv6_mc_init_dev(struct inet6_dev *idev)
2252 {
2253         write_lock_bh(&idev->lock);
2254         spin_lock_init(&idev->mc_lock);
2255         idev->mc_gq_running = 0;
2256         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2257                         (unsigned long)idev);
2258         idev->mc_tomb = NULL;
2259         idev->mc_ifc_count = 0;
2260         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2261                         (unsigned long)idev);
2262         idev->mc_qrv = MLD_QRV_DEFAULT;
2263         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2264         idev->mc_v1_seen = 0;
2265         write_unlock_bh(&idev->lock);
2266 }
2267
2268 /*
2269  *      Device is about to be destroyed: clean up.
2270  */
2271
2272 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2273 {
2274         struct ifmcaddr6 *i;
2275
2276         /* Deactivate timers */
2277         ipv6_mc_down(idev);
2278
2279         /* Delete all-nodes address. */
2280         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2281          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2282          * fail.
2283          */
2284         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2285
2286         if (idev->cnf.forwarding)
2287                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2288
2289         write_lock_bh(&idev->lock);
2290         while ((i = idev->mc_list) != NULL) {
2291                 idev->mc_list = i->next;
2292                 write_unlock_bh(&idev->lock);
2293
2294                 igmp6_group_dropped(i);
2295                 ma_put(i);
2296
2297                 write_lock_bh(&idev->lock);
2298         }
2299         write_unlock_bh(&idev->lock);
2300 }
2301
2302 #ifdef CONFIG_PROC_FS
2303 struct igmp6_mc_iter_state {
2304         struct seq_net_private p;
2305         struct net_device *dev;
2306         struct inet6_dev *idev;
2307 };
2308
2309 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2310
2311 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2312 {
2313         struct ifmcaddr6 *im = NULL;
2314         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2315         struct net *net = seq_file_net(seq);
2316
2317         state->idev = NULL;
2318         for_each_netdev_rcu(net, state->dev) {
2319                 struct inet6_dev *idev;
2320                 idev = __in6_dev_get(state->dev);
2321                 if (!idev)
2322                         continue;
2323                 read_lock_bh(&idev->lock);
2324                 im = idev->mc_list;
2325                 if (im) {
2326                         state->idev = idev;
2327                         break;
2328                 }
2329                 read_unlock_bh(&idev->lock);
2330         }
2331         return im;
2332 }
2333
2334 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2335 {
2336         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2337
2338         im = im->next;
2339         while (!im) {
2340                 if (likely(state->idev != NULL))
2341                         read_unlock_bh(&state->idev->lock);
2342
2343                 state->dev = next_net_device_rcu(state->dev);
2344                 if (!state->dev) {
2345                         state->idev = NULL;
2346                         break;
2347                 }
2348                 state->idev = __in6_dev_get(state->dev);
2349                 if (!state->idev)
2350                         continue;
2351                 read_lock_bh(&state->idev->lock);
2352                 im = state->idev->mc_list;
2353         }
2354         return im;
2355 }
2356
2357 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2358 {
2359         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2360         if (im)
2361                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2362                         --pos;
2363         return pos ? NULL : im;
2364 }
2365
2366 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2367         __acquires(RCU)
2368 {
2369         rcu_read_lock();
2370         return igmp6_mc_get_idx(seq, *pos);
2371 }
2372
2373 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2374 {
2375         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2376
2377         ++*pos;
2378         return im;
2379 }
2380
2381 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2382         __releases(RCU)
2383 {
2384         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2385
2386         if (likely(state->idev != NULL)) {
2387                 read_unlock_bh(&state->idev->lock);
2388                 state->idev = NULL;
2389         }
2390         state->dev = NULL;
2391         rcu_read_unlock();
2392 }
2393
2394 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2395 {
2396         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2397         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2398
2399         seq_printf(seq,
2400                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2401                    state->dev->ifindex, state->dev->name,
2402                    &im->mca_addr,
2403                    im->mca_users, im->mca_flags,
2404                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2405                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2406         return 0;
2407 }
2408
2409 static const struct seq_operations igmp6_mc_seq_ops = {
2410         .start  =       igmp6_mc_seq_start,
2411         .next   =       igmp6_mc_seq_next,
2412         .stop   =       igmp6_mc_seq_stop,
2413         .show   =       igmp6_mc_seq_show,
2414 };
2415
2416 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2417 {
2418         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2419                             sizeof(struct igmp6_mc_iter_state));
2420 }
2421
2422 static const struct file_operations igmp6_mc_seq_fops = {
2423         .owner          =       THIS_MODULE,
2424         .open           =       igmp6_mc_seq_open,
2425         .read           =       seq_read,
2426         .llseek         =       seq_lseek,
2427         .release        =       seq_release_net,
2428 };
2429
2430 struct igmp6_mcf_iter_state {
2431         struct seq_net_private p;
2432         struct net_device *dev;
2433         struct inet6_dev *idev;
2434         struct ifmcaddr6 *im;
2435 };
2436
2437 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2438
2439 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2440 {
2441         struct ip6_sf_list *psf = NULL;
2442         struct ifmcaddr6 *im = NULL;
2443         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2444         struct net *net = seq_file_net(seq);
2445
2446         state->idev = NULL;
2447         state->im = NULL;
2448         for_each_netdev_rcu(net, state->dev) {
2449                 struct inet6_dev *idev;
2450                 idev = __in6_dev_get(state->dev);
2451                 if (unlikely(idev == NULL))
2452                         continue;
2453                 read_lock_bh(&idev->lock);
2454                 im = idev->mc_list;
2455                 if (likely(im != NULL)) {
2456                         spin_lock_bh(&im->mca_lock);
2457                         psf = im->mca_sources;
2458                         if (likely(psf != NULL)) {
2459                                 state->im = im;
2460                                 state->idev = idev;
2461                                 break;
2462                         }
2463                         spin_unlock_bh(&im->mca_lock);
2464                 }
2465                 read_unlock_bh(&idev->lock);
2466         }
2467         return psf;
2468 }
2469
2470 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2471 {
2472         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2473
2474         psf = psf->sf_next;
2475         while (!psf) {
2476                 spin_unlock_bh(&state->im->mca_lock);
2477                 state->im = state->im->next;
2478                 while (!state->im) {
2479                         if (likely(state->idev != NULL))
2480                                 read_unlock_bh(&state->idev->lock);
2481
2482                         state->dev = next_net_device_rcu(state->dev);
2483                         if (!state->dev) {
2484                                 state->idev = NULL;
2485                                 goto out;
2486                         }
2487                         state->idev = __in6_dev_get(state->dev);
2488                         if (!state->idev)
2489                                 continue;
2490                         read_lock_bh(&state->idev->lock);
2491                         state->im = state->idev->mc_list;
2492                 }
2493                 if (!state->im)
2494                         break;
2495                 spin_lock_bh(&state->im->mca_lock);
2496                 psf = state->im->mca_sources;
2497         }
2498 out:
2499         return psf;
2500 }
2501
2502 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2503 {
2504         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2505         if (psf)
2506                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2507                         --pos;
2508         return pos ? NULL : psf;
2509 }
2510
2511 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2512         __acquires(RCU)
2513 {
2514         rcu_read_lock();
2515         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2516 }
2517
2518 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2519 {
2520         struct ip6_sf_list *psf;
2521         if (v == SEQ_START_TOKEN)
2522                 psf = igmp6_mcf_get_first(seq);
2523         else
2524                 psf = igmp6_mcf_get_next(seq, v);
2525         ++*pos;
2526         return psf;
2527 }
2528
2529 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2530         __releases(RCU)
2531 {
2532         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2533         if (likely(state->im != NULL)) {
2534                 spin_unlock_bh(&state->im->mca_lock);
2535                 state->im = NULL;
2536         }
2537         if (likely(state->idev != NULL)) {
2538                 read_unlock_bh(&state->idev->lock);
2539                 state->idev = NULL;
2540         }
2541         state->dev = NULL;
2542         rcu_read_unlock();
2543 }
2544
2545 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2546 {
2547         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2548         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2549
2550         if (v == SEQ_START_TOKEN) {
2551                 seq_printf(seq,
2552                            "%3s %6s "
2553                            "%32s %32s %6s %6s\n", "Idx",
2554                            "Device", "Multicast Address",
2555                            "Source Address", "INC", "EXC");
2556         } else {
2557                 seq_printf(seq,
2558                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2559                            state->dev->ifindex, state->dev->name,
2560                            &state->im->mca_addr,
2561                            &psf->sf_addr,
2562                            psf->sf_count[MCAST_INCLUDE],
2563                            psf->sf_count[MCAST_EXCLUDE]);
2564         }
2565         return 0;
2566 }
2567
2568 static const struct seq_operations igmp6_mcf_seq_ops = {
2569         .start  =       igmp6_mcf_seq_start,
2570         .next   =       igmp6_mcf_seq_next,
2571         .stop   =       igmp6_mcf_seq_stop,
2572         .show   =       igmp6_mcf_seq_show,
2573 };
2574
2575 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2576 {
2577         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2578                             sizeof(struct igmp6_mcf_iter_state));
2579 }
2580
2581 static const struct file_operations igmp6_mcf_seq_fops = {
2582         .owner          =       THIS_MODULE,
2583         .open           =       igmp6_mcf_seq_open,
2584         .read           =       seq_read,
2585         .llseek         =       seq_lseek,
2586         .release        =       seq_release_net,
2587 };
2588
2589 static int __net_init igmp6_proc_init(struct net *net)
2590 {
2591         int err;
2592
2593         err = -ENOMEM;
2594         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2595                 goto out;
2596         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2597                                   &igmp6_mcf_seq_fops))
2598                 goto out_proc_net_igmp6;
2599
2600         err = 0;
2601 out:
2602         return err;
2603
2604 out_proc_net_igmp6:
2605         proc_net_remove(net, "igmp6");
2606         goto out;
2607 }
2608
2609 static void __net_exit igmp6_proc_exit(struct net *net)
2610 {
2611         proc_net_remove(net, "mcfilter6");
2612         proc_net_remove(net, "igmp6");
2613 }
2614 #else
2615 static inline int igmp6_proc_init(struct net *net)
2616 {
2617         return 0;
2618 }
2619 static inline void igmp6_proc_exit(struct net *net)
2620 {
2621 }
2622 #endif
2623
2624 static int __net_init igmp6_net_init(struct net *net)
2625 {
2626         int err;
2627
2628         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2629                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2630         if (err < 0) {
2631                 printk(KERN_ERR
2632                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2633                        err);
2634                 goto out;
2635         }
2636
2637         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2638
2639         err = igmp6_proc_init(net);
2640         if (err)
2641                 goto out_sock_create;
2642 out:
2643         return err;
2644
2645 out_sock_create:
2646         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2647         goto out;
2648 }
2649
2650 static void __net_exit igmp6_net_exit(struct net *net)
2651 {
2652         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2653         igmp6_proc_exit(net);
2654 }
2655
2656 static struct pernet_operations igmp6_net_ops = {
2657         .init = igmp6_net_init,
2658         .exit = igmp6_net_exit,
2659 };
2660
2661 int __init igmp6_init(void)
2662 {
2663         return register_pernet_subsys(&igmp6_net_ops);
2664 }
2665
2666 void igmp6_cleanup(void)
2667 {
2668         unregister_pernet_subsys(&igmp6_net_ops);
2669 }