net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <net/mld.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/net_namespace.h>
  53 #include <net/sock.h>
  54 #include <net/snmp.h>
  55
  56 #include <net/ipv6.h>
  57 #include <net/protocol.h>
  58 #include <net/if_inet6.h>
  59 #include <net/ndisc.h>
  60 #include <net/addrconf.h>
  61 #include <net/ip6_route.h>
  62 #include <net/inet_common.h>
  63
  64 #include <net/ip6_checksum.h>
  65
  66 /* Set to 3 to get tracing... */
  67 #define MCAST_DEBUG 2
  68
  69 #if MCAST_DEBUG >= 3
  70 #define MDBG(x) printk x
  71 #else
  72 #define MDBG(x)
  73 #endif
  74
  75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  77         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  80 };
  81
  82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84 /* Big mc list lock for all the sockets */
  85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  86
  87 static void igmp6_join_group(struct ifmcaddr6 *ma);
  88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89 static void igmp6_timer_handler(unsigned long data);
  90
  91 static void mld_gq_timer_expire(unsigned long data);
  92 static void mld_ifc_timer_expire(unsigned long data);
  93 static void mld_ifc_event(struct inet6_dev *idev);
  94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  96 static void mld_clear_delrec(struct inet6_dev *idev);
  97 static int sf_setstate(struct ifmcaddr6 *pmc);
  98 static void sf_markstate(struct ifmcaddr6 *pmc);
  99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 101                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 102                           int delta);
 103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 104                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 105                           int delta);
 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 107                             struct inet6_dev *idev);
 108
 109
 110 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 111 #define MLD_QRV_DEFAULT         2
 112
 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 114                 (idev)->cnf.force_mld_version == 1 || \
 115                 ((idev)->mc_v1_seen && \
 116                 time_before(jiffies, (idev)->mc_v1_seen)))
 117
 118 #define IPV6_MLD_MAX_MSF        64
 119
 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 121
 122 /*
 123  *      socket join on multicast group
 124  */
 125
 126 #define for_each_pmc_rcu(np, pmc)                               \
 127         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 128              pmc != NULL;                                       \
 129              pmc = rcu_dereference(pmc->next))
 130
 131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 132 {
 133         struct net_device *dev = NULL;
 134         struct ipv6_mc_socklist *mc_lst;
 135         struct ipv6_pinfo *np = inet6_sk(sk);
 136         struct net *net = sock_net(sk);
 137         int err;
 138
 139         if (!ipv6_addr_is_multicast(addr))
 140                 return -EINVAL;
 141
 142         rcu_read_lock();
 143         for_each_pmc_rcu(np, mc_lst) {
 144                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 145                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 146                         rcu_read_unlock();
 147                         return -EADDRINUSE;
 148                 }
 149         }
 150         rcu_read_unlock();
 151
 152         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 153
 154         if (mc_lst == NULL)
 155                 return -ENOMEM;
 156
 157         mc_lst->next = NULL;
 158         mc_lst->addr = *addr;
 159
 160         rcu_read_lock();
 161         if (ifindex == 0) {
 162                 struct rt6_info *rt;
 163                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 164                 if (rt) {
 165                         dev = rt->dst.dev;
 166                         ip6_rt_put(rt);
 167                 }
 168         } else
 169                 dev = dev_get_by_index_rcu(net, ifindex);
 170
 171         if (dev == NULL) {
 172                 rcu_read_unlock();
 173                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 174                 return -ENODEV;
 175         }
 176
 177         mc_lst->ifindex = dev->ifindex;
 178         mc_lst->sfmode = MCAST_EXCLUDE;
 179         rwlock_init(&mc_lst->sflock);
 180         mc_lst->sflist = NULL;
 181
 182         /*
 183          *      now add/increase the group membership on the device
 184          */
 185
 186         err = ipv6_dev_mc_inc(dev, addr);
 187
 188         if (err) {
 189                 rcu_read_unlock();
 190                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 191                 return err;
 192         }
 193
 194         spin_lock(&ipv6_sk_mc_lock);
 195         mc_lst->next = np->ipv6_mc_list;
 196         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 197         spin_unlock(&ipv6_sk_mc_lock);
 198
 199         rcu_read_unlock();
 200
 201         return 0;
 202 }
 203
 204 /*
 205  *      socket leave on multicast group
 206  */
 207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 208 {
 209         struct ipv6_pinfo *np = inet6_sk(sk);
 210         struct ipv6_mc_socklist *mc_lst;
 211         struct ipv6_mc_socklist __rcu **lnk;
 212         struct net *net = sock_net(sk);
 213
 214         if (!ipv6_addr_is_multicast(addr))
 215                 return -EINVAL;
 216
 217         spin_lock(&ipv6_sk_mc_lock);
 218         for (lnk = &np->ipv6_mc_list;
 219              (mc_lst = rcu_dereference_protected(*lnk,
 220                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 221               lnk = &mc_lst->next) {
 222                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 223                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 224                         struct net_device *dev;
 225
 226                         *lnk = mc_lst->next;
 227                         spin_unlock(&ipv6_sk_mc_lock);
 228
 229                         rcu_read_lock();
 230                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 231                         if (dev != NULL) {
 232                                 struct inet6_dev *idev = __in6_dev_get(dev);
 233
 234                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 235                                 if (idev)
 236                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 237                         } else
 238                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 239                         rcu_read_unlock();
 240                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 241                         kfree_rcu(mc_lst, rcu);
 242                         return 0;
 243                 }
 244         }
 245         spin_unlock(&ipv6_sk_mc_lock);
 246
 247         return -EADDRNOTAVAIL;
 248 }
 249
 250 /* called with rcu_read_lock() */
 251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 252                                              const struct in6_addr *group,
 253                                              int ifindex)
 254 {
 255         struct net_device *dev = NULL;
 256         struct inet6_dev *idev = NULL;
 257
 258         if (ifindex == 0) {
 259                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 260
 261                 if (rt) {
 262                         dev = rt->dst.dev;
 263                         ip6_rt_put(rt);
 264                 }
 265         } else
 266                 dev = dev_get_by_index_rcu(net, ifindex);
 267
 268         if (!dev)
 269                 return NULL;
 270         idev = __in6_dev_get(dev);
 271         if (!idev)
 272                 return NULL;
 273         read_lock_bh(&idev->lock);
 274         if (idev->dead) {
 275                 read_unlock_bh(&idev->lock);
 276                 return NULL;
 277         }
 278         return idev;
 279 }
 280
 281 void ipv6_sock_mc_close(struct sock *sk)
 282 {
 283         struct ipv6_pinfo *np = inet6_sk(sk);
 284         struct ipv6_mc_socklist *mc_lst;
 285         struct net *net = sock_net(sk);
 286
 287         if (!rcu_access_pointer(np->ipv6_mc_list))
 288                 return;
 289
 290         spin_lock(&ipv6_sk_mc_lock);
 291         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 292                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 293                 struct net_device *dev;
 294
 295                 np->ipv6_mc_list = mc_lst->next;
 296                 spin_unlock(&ipv6_sk_mc_lock);
 297
 298                 rcu_read_lock();
 299                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 300                 if (dev) {
 301                         struct inet6_dev *idev = __in6_dev_get(dev);
 302
 303                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 304                         if (idev)
 305                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 306                 } else
 307                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 308                 rcu_read_unlock();
 309
 310                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 311                 kfree_rcu(mc_lst, rcu);
 312
 313                 spin_lock(&ipv6_sk_mc_lock);
 314         }
 315         spin_unlock(&ipv6_sk_mc_lock);
 316 }
 317
 318 int ip6_mc_source(int add, int omode, struct sock *sk,
 319         struct group_source_req *pgsr)
 320 {
 321         struct in6_addr *source, *group;
 322         struct ipv6_mc_socklist *pmc;
 323         struct inet6_dev *idev;
 324         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 325         struct ip6_sf_socklist *psl;
 326         struct net *net = sock_net(sk);
 327         int i, j, rv;
 328         int leavegroup = 0;
 329         int pmclocked = 0;
 330         int err;
 331
 332         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 333         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 334
 335         if (!ipv6_addr_is_multicast(group))
 336                 return -EINVAL;
 337
 338         rcu_read_lock();
 339         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 340         if (!idev) {
 341                 rcu_read_unlock();
 342                 return -ENODEV;
 343         }
 344
 345         err = -EADDRNOTAVAIL;
 346
 347         for_each_pmc_rcu(inet6, pmc) {
 348                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 349                         continue;
 350                 if (ipv6_addr_equal(&pmc->addr, group))
 351                         break;
 352         }
 353         if (!pmc) {             /* must have a prior join */
 354                 err = -EINVAL;
 355                 goto done;
 356         }
 357         /* if a source filter was set, must be the same mode as before */
 358         if (pmc->sflist) {
 359                 if (pmc->sfmode != omode) {
 360                         err = -EINVAL;
 361                         goto done;
 362                 }
 363         } else if (pmc->sfmode != omode) {
 364                 /* allow mode switches for empty-set filters */
 365                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 366                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 367                 pmc->sfmode = omode;
 368         }
 369
 370         write_lock(&pmc->sflock);
 371         pmclocked = 1;
 372
 373         psl = pmc->sflist;
 374         if (!add) {
 375                 if (!psl)
 376                         goto done;      /* err = -EADDRNOTAVAIL */
 377                 rv = !0;
 378                 for (i=0; i<psl->sl_count; i++) {
 379                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 380                         if (rv == 0)
 381                                 break;
 382                 }
 383                 if (rv)         /* source not found */
 384                         goto done;      /* err = -EADDRNOTAVAIL */
 385
 386                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 387                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 388                         leavegroup = 1;
 389                         goto done;
 390                 }
 391
 392                 /* update the interface filter */
 393                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 394
 395                 for (j=i+1; j<psl->sl_count; j++)
 396                         psl->sl_addr[j-1] = psl->sl_addr[j];
 397                 psl->sl_count--;
 398                 err = 0;
 399                 goto done;
 400         }
 401         /* else, add a new source to the filter */
 402
 403         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 404                 err = -ENOBUFS;
 405                 goto done;
 406         }
 407         if (!psl || psl->sl_count == psl->sl_max) {
 408                 struct ip6_sf_socklist *newpsl;
 409                 int count = IP6_SFBLOCK;
 410
 411                 if (psl)
 412                         count += psl->sl_max;
 413                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 414                 if (!newpsl) {
 415                         err = -ENOBUFS;
 416                         goto done;
 417                 }
 418                 newpsl->sl_max = count;
 419                 newpsl->sl_count = count - IP6_SFBLOCK;
 420                 if (psl) {
 421                         for (i=0; i<psl->sl_count; i++)
 422                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 423                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 424                 }
 425                 pmc->sflist = psl = newpsl;
 426         }
 427         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 428         for (i=0; i<psl->sl_count; i++) {
 429                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 430                 if (rv == 0)
 431                         break;
 432         }
 433         if (rv == 0)            /* address already there is an error */
 434                 goto done;
 435         for (j=psl->sl_count-1; j>=i; j--)
 436                 psl->sl_addr[j+1] = psl->sl_addr[j];
 437         psl->sl_addr[i] = *source;
 438         psl->sl_count++;
 439         err = 0;
 440         /* update the interface list */
 441         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 442 done:
 443         if (pmclocked)
 444                 write_unlock(&pmc->sflock);
 445         read_unlock_bh(&idev->lock);
 446         rcu_read_unlock();
 447         if (leavegroup)
 448                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 449         return err;
 450 }
 451
 452 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 453 {
 454         const struct in6_addr *group;
 455         struct ipv6_mc_socklist *pmc;
 456         struct inet6_dev *idev;
 457         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 458         struct ip6_sf_socklist *newpsl, *psl;
 459         struct net *net = sock_net(sk);
 460         int leavegroup = 0;
 461         int i, err;
 462
 463         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 464
 465         if (!ipv6_addr_is_multicast(group))
 466                 return -EINVAL;
 467         if (gsf->gf_fmode != MCAST_INCLUDE &&
 468             gsf->gf_fmode != MCAST_EXCLUDE)
 469                 return -EINVAL;
 470
 471         rcu_read_lock();
 472         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 473
 474         if (!idev) {
 475                 rcu_read_unlock();
 476                 return -ENODEV;
 477         }
 478
 479         err = 0;
 480
 481         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 482                 leavegroup = 1;
 483                 goto done;
 484         }
 485
 486         for_each_pmc_rcu(inet6, pmc) {
 487                 if (pmc->ifindex != gsf->gf_interface)
 488                         continue;
 489                 if (ipv6_addr_equal(&pmc->addr, group))
 490                         break;
 491         }
 492         if (!pmc) {             /* must have a prior join */
 493                 err = -EINVAL;
 494                 goto done;
 495         }
 496         if (gsf->gf_numsrc) {
 497                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 498                                                           GFP_ATOMIC);
 499                 if (!newpsl) {
 500                         err = -ENOBUFS;
 501                         goto done;
 502                 }
 503                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 504                 for (i=0; i<newpsl->sl_count; ++i) {
 505                         struct sockaddr_in6 *psin6;
 506
 507                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 508                         newpsl->sl_addr[i] = psin6->sin6_addr;
 509                 }
 510                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 511                         newpsl->sl_count, newpsl->sl_addr, 0);
 512                 if (err) {
 513                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 514                         goto done;
 515                 }
 516         } else {
 517                 newpsl = NULL;
 518                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 519         }
 520
 521         write_lock(&pmc->sflock);
 522         psl = pmc->sflist;
 523         if (psl) {
 524                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 525                         psl->sl_count, psl->sl_addr, 0);
 526                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 527         } else
 528                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 529         pmc->sflist = newpsl;
 530         pmc->sfmode = gsf->gf_fmode;
 531         write_unlock(&pmc->sflock);
 532         err = 0;
 533 done:
 534         read_unlock_bh(&idev->lock);
 535         rcu_read_unlock();
 536         if (leavegroup)
 537                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 538         return err;
 539 }
 540
 541 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 542         struct group_filter __user *optval, int __user *optlen)
 543 {
 544         int err, i, count, copycount;
 545         const struct in6_addr *group;
 546         struct ipv6_mc_socklist *pmc;
 547         struct inet6_dev *idev;
 548         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 549         struct ip6_sf_socklist *psl;
 550         struct net *net = sock_net(sk);
 551
 552         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 553
 554         if (!ipv6_addr_is_multicast(group))
 555                 return -EINVAL;
 556
 557         rcu_read_lock();
 558         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 559
 560         if (!idev) {
 561                 rcu_read_unlock();
 562                 return -ENODEV;
 563         }
 564
 565         err = -EADDRNOTAVAIL;
 566         /*
 567          * changes to the ipv6_mc_list require the socket lock and
 568          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 569          * so reading the list is safe.
 570          */
 571
 572         for_each_pmc_rcu(inet6, pmc) {
 573                 if (pmc->ifindex != gsf->gf_interface)
 574                         continue;
 575                 if (ipv6_addr_equal(group, &pmc->addr))
 576                         break;
 577         }
 578         if (!pmc)               /* must have a prior join */
 579                 goto done;
 580         gsf->gf_fmode = pmc->sfmode;
 581         psl = pmc->sflist;
 582         count = psl ? psl->sl_count : 0;
 583         read_unlock_bh(&idev->lock);
 584         rcu_read_unlock();
 585
 586         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 587         gsf->gf_numsrc = count;
 588         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 589             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 590                 return -EFAULT;
 591         }
 592         /* changes to psl require the socket lock, a read lock on
 593          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 594          * have the socket lock, so reading here is safe.
 595          */
 596         for (i=0; i<copycount; i++) {
 597                 struct sockaddr_in6 *psin6;
 598                 struct sockaddr_storage ss;
 599
 600                 psin6 = (struct sockaddr_in6 *)&ss;
 601                 memset(&ss, 0, sizeof(ss));
 602                 psin6->sin6_family = AF_INET6;
 603                 psin6->sin6_addr = psl->sl_addr[i];
 604                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 605                         return -EFAULT;
 606         }
 607         return 0;
 608 done:
 609         read_unlock_bh(&idev->lock);
 610         rcu_read_unlock();
 611         return err;
 612 }
 613
 614 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 615                     const struct in6_addr *src_addr)
 616 {
 617         struct ipv6_pinfo *np = inet6_sk(sk);
 618         struct ipv6_mc_socklist *mc;
 619         struct ip6_sf_socklist *psl;
 620         bool rv = true;
 621
 622         rcu_read_lock();
 623         for_each_pmc_rcu(np, mc) {
 624                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 625                         break;
 626         }
 627         if (!mc) {
 628                 rcu_read_unlock();
 629                 return true;
 630         }
 631         read_lock(&mc->sflock);
 632         psl = mc->sflist;
 633         if (!psl) {
 634                 rv = mc->sfmode == MCAST_EXCLUDE;
 635         } else {
 636                 int i;
 637
 638                 for (i=0; i<psl->sl_count; i++) {
 639                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 640                                 break;
 641                 }
 642                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 643                         rv = false;
 644                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 645                         rv = false;
 646         }
 647         read_unlock(&mc->sflock);
 648         rcu_read_unlock();
 649
 650         return rv;
 651 }
 652
 653 static void ma_put(struct ifmcaddr6 *mc)
 654 {
 655         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 656                 in6_dev_put(mc->idev);
 657                 kfree(mc);
 658         }
 659 }
 660
 661 static void igmp6_group_added(struct ifmcaddr6 *mc)
 662 {
 663         struct net_device *dev = mc->idev->dev;
 664         char buf[MAX_ADDR_LEN];
 665
 666         spin_lock_bh(&mc->mca_lock);
 667         if (!(mc->mca_flags&MAF_LOADED)) {
 668                 mc->mca_flags |= MAF_LOADED;
 669                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 670                         dev_mc_add(dev, buf);
 671         }
 672         spin_unlock_bh(&mc->mca_lock);
 673
 674         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 675                 return;
 676
 677         if (MLD_V1_SEEN(mc->idev)) {
 678                 igmp6_join_group(mc);
 679                 return;
 680         }
 681         /* else v2 */
 682
 683         mc->mca_crcount = mc->idev->mc_qrv;
 684         mld_ifc_event(mc->idev);
 685 }
 686
 687 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 688 {
 689         struct net_device *dev = mc->idev->dev;
 690         char buf[MAX_ADDR_LEN];
 691
 692         spin_lock_bh(&mc->mca_lock);
 693         if (mc->mca_flags&MAF_LOADED) {
 694                 mc->mca_flags &= ~MAF_LOADED;
 695                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 696                         dev_mc_del(dev, buf);
 697         }
 698
 699         if (mc->mca_flags & MAF_NOREPORT)
 700                 goto done;
 701         spin_unlock_bh(&mc->mca_lock);
 702
 703         if (!mc->idev->dead)
 704                 igmp6_leave_group(mc);
 705
 706         spin_lock_bh(&mc->mca_lock);
 707         if (del_timer(&mc->mca_timer))
 708                 atomic_dec(&mc->mca_refcnt);
 709 done:
 710         ip6_mc_clear_src(mc);
 711         spin_unlock_bh(&mc->mca_lock);
 712 }
 713
 714 /*
 715  * deleted ifmcaddr6 manipulation
 716  */
 717 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 718 {
 719         struct ifmcaddr6 *pmc;
 720
 721         /* this is an "ifmcaddr6" for convenience; only the fields below
 722          * are actually used. In particular, the refcnt and users are not
 723          * used for management of the delete list. Using the same structure
 724          * for deleted items allows change reports to use common code with
 725          * non-deleted or query-response MCA's.
 726          */
 727         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 728         if (!pmc)
 729                 return;
 730
 731         spin_lock_bh(&im->mca_lock);
 732         spin_lock_init(&pmc->mca_lock);
 733         pmc->idev = im->idev;
 734         in6_dev_hold(idev);
 735         pmc->mca_addr = im->mca_addr;
 736         pmc->mca_crcount = idev->mc_qrv;
 737         pmc->mca_sfmode = im->mca_sfmode;
 738         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 739                 struct ip6_sf_list *psf;
 740
 741                 pmc->mca_tomb = im->mca_tomb;
 742                 pmc->mca_sources = im->mca_sources;
 743                 im->mca_tomb = im->mca_sources = NULL;
 744                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 745                         psf->sf_crcount = pmc->mca_crcount;
 746         }
 747         spin_unlock_bh(&im->mca_lock);
 748
 749         spin_lock_bh(&idev->mc_lock);
 750         pmc->next = idev->mc_tomb;
 751         idev->mc_tomb = pmc;
 752         spin_unlock_bh(&idev->mc_lock);
 753 }
 754
 755 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 756 {
 757         struct ifmcaddr6 *pmc, *pmc_prev;
 758         struct ip6_sf_list *psf, *psf_next;
 759
 760         spin_lock_bh(&idev->mc_lock);
 761         pmc_prev = NULL;
 762         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 763                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 764                         break;
 765                 pmc_prev = pmc;
 766         }
 767         if (pmc) {
 768                 if (pmc_prev)
 769                         pmc_prev->next = pmc->next;
 770                 else
 771                         idev->mc_tomb = pmc->next;
 772         }
 773         spin_unlock_bh(&idev->mc_lock);
 774
 775         if (pmc) {
 776                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 777                         psf_next = psf->sf_next;
 778                         kfree(psf);
 779                 }
 780                 in6_dev_put(pmc->idev);
 781                 kfree(pmc);
 782         }
 783 }
 784
 785 static void mld_clear_delrec(struct inet6_dev *idev)
 786 {
 787         struct ifmcaddr6 *pmc, *nextpmc;
 788
 789         spin_lock_bh(&idev->mc_lock);
 790         pmc = idev->mc_tomb;
 791         idev->mc_tomb = NULL;
 792         spin_unlock_bh(&idev->mc_lock);
 793
 794         for (; pmc; pmc = nextpmc) {
 795                 nextpmc = pmc->next;
 796                 ip6_mc_clear_src(pmc);
 797                 in6_dev_put(pmc->idev);
 798                 kfree(pmc);
 799         }
 800
 801         /* clear dead sources, too */
 802         read_lock_bh(&idev->lock);
 803         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 804                 struct ip6_sf_list *psf, *psf_next;
 805
 806                 spin_lock_bh(&pmc->mca_lock);
 807                 psf = pmc->mca_tomb;
 808                 pmc->mca_tomb = NULL;
 809                 spin_unlock_bh(&pmc->mca_lock);
 810                 for (; psf; psf=psf_next) {
 811                         psf_next = psf->sf_next;
 812                         kfree(psf);
 813                 }
 814         }
 815         read_unlock_bh(&idev->lock);
 816 }
 817
 818
 819 /*
 820  *      device multicast group inc (add if not found)
 821  */
 822 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 823 {
 824         struct ifmcaddr6 *mc;
 825         struct inet6_dev *idev;
 826
 827         /* we need to take a reference on idev */
 828         idev = in6_dev_get(dev);
 829
 830         if (idev == NULL)
 831                 return -EINVAL;
 832
 833         write_lock_bh(&idev->lock);
 834         if (idev->dead) {
 835                 write_unlock_bh(&idev->lock);
 836                 in6_dev_put(idev);
 837                 return -ENODEV;
 838         }
 839
 840         for (mc = idev->mc_list; mc; mc = mc->next) {
 841                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 842                         mc->mca_users++;
 843                         write_unlock_bh(&idev->lock);
 844                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 845                                 NULL, 0);
 846                         in6_dev_put(idev);
 847                         return 0;
 848                 }
 849         }
 850
 851         /*
 852          *      not found: create a new one.
 853          */
 854
 855         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 856
 857         if (mc == NULL) {
 858                 write_unlock_bh(&idev->lock);
 859                 in6_dev_put(idev);
 860                 return -ENOMEM;
 861         }
 862
 863         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 864
 865         mc->mca_addr = *addr;
 866         mc->idev = idev; /* (reference taken) */
 867         mc->mca_users = 1;
 868         /* mca_stamp should be updated upon changes */
 869         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 870         atomic_set(&mc->mca_refcnt, 2);
 871         spin_lock_init(&mc->mca_lock);
 872
 873         /* initial mode is (EX, empty) */
 874         mc->mca_sfmode = MCAST_EXCLUDE;
 875         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 876
 877         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 878             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 879                 mc->mca_flags |= MAF_NOREPORT;
 880
 881         mc->next = idev->mc_list;
 882         idev->mc_list = mc;
 883         write_unlock_bh(&idev->lock);
 884
 885         mld_del_delrec(idev, &mc->mca_addr);
 886         igmp6_group_added(mc);
 887         ma_put(mc);
 888         return 0;
 889 }
 890
 891 /*
 892  *      device multicast group del
 893  */
 894 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 895 {
 896         struct ifmcaddr6 *ma, **map;
 897
 898         write_lock_bh(&idev->lock);
 899         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 900                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 901                         if (--ma->mca_users == 0) {
 902                                 *map = ma->next;
 903                                 write_unlock_bh(&idev->lock);
 904
 905                                 igmp6_group_dropped(ma);
 906
 907                                 ma_put(ma);
 908                                 return 0;
 909                         }
 910                         write_unlock_bh(&idev->lock);
 911                         return 0;
 912                 }
 913         }
 914         write_unlock_bh(&idev->lock);
 915
 916         return -ENOENT;
 917 }
 918
 919 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 920 {
 921         struct inet6_dev *idev;
 922         int err;
 923
 924         rcu_read_lock();
 925
 926         idev = __in6_dev_get(dev);
 927         if (!idev)
 928                 err = -ENODEV;
 929         else
 930                 err = __ipv6_dev_mc_dec(idev, addr);
 931
 932         rcu_read_unlock();
 933         return err;
 934 }
 935
 936 /*
 937  *      check if the interface/address pair is valid
 938  */
 939 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 940                          const struct in6_addr *src_addr)
 941 {
 942         struct inet6_dev *idev;
 943         struct ifmcaddr6 *mc;
 944         bool rv = false;
 945
 946         rcu_read_lock();
 947         idev = __in6_dev_get(dev);
 948         if (idev) {
 949                 read_lock_bh(&idev->lock);
 950                 for (mc = idev->mc_list; mc; mc=mc->next) {
 951                         if (ipv6_addr_equal(&mc->mca_addr, group))
 952                                 break;
 953                 }
 954                 if (mc) {
 955                         if (src_addr && !ipv6_addr_any(src_addr)) {
 956                                 struct ip6_sf_list *psf;
 957
 958                                 spin_lock_bh(&mc->mca_lock);
 959                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 960                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 961                                                 break;
 962                                 }
 963                                 if (psf)
 964                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 965                                                 psf->sf_count[MCAST_EXCLUDE] !=
 966                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 967                                 else
 968                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 969                                 spin_unlock_bh(&mc->mca_lock);
 970                         } else
 971                                 rv = true; /* don't filter unspecified source */
 972                 }
 973                 read_unlock_bh(&idev->lock);
 974         }
 975         rcu_read_unlock();
 976         return rv;
 977 }
 978
 979 static void mld_gq_start_timer(struct inet6_dev *idev)
 980 {
 981         int tv = net_random() % idev->mc_maxdelay;
 982
 983         idev->mc_gq_running = 1;
 984         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
 985                 in6_dev_hold(idev);
 986 }
 987
 988 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
 989 {
 990         int tv = net_random() % delay;
 991
 992         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
 993                 in6_dev_hold(idev);
 994 }
 995
 996 /*
 997  *      IGMP handling (alias multicast ICMPv6 messages)
 998  */
 999
1000 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1001 {
1002         unsigned long delay = resptime;
1003
1004         /* Do not start timer for these addresses */
1005         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1006             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1007                 return;
1008
1009         if (del_timer(&ma->mca_timer)) {
1010                 atomic_dec(&ma->mca_refcnt);
1011                 delay = ma->mca_timer.expires - jiffies;
1012         }
1013
1014         if (delay >= resptime) {
1015                 if (resptime)
1016                         delay = net_random() % resptime;
1017                 else
1018                         delay = 1;
1019         }
1020         ma->mca_timer.expires = jiffies + delay;
1021         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1022                 atomic_inc(&ma->mca_refcnt);
1023         ma->mca_flags |= MAF_TIMER_RUNNING;
1024 }
1025
1026 /* mark EXCLUDE-mode sources */
1027 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1028                              const struct in6_addr *srcs)
1029 {
1030         struct ip6_sf_list *psf;
1031         int i, scount;
1032
1033         scount = 0;
1034         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1035                 if (scount == nsrcs)
1036                         break;
1037                 for (i=0; i<nsrcs; i++) {
1038                         /* skip inactive filters */
1039                         if (psf->sf_count[MCAST_INCLUDE] ||
1040                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1041                             psf->sf_count[MCAST_EXCLUDE])
1042                                 break;
1043                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1044                                 scount++;
1045                                 break;
1046                         }
1047                 }
1048         }
1049         pmc->mca_flags &= ~MAF_GSQUERY;
1050         if (scount == nsrcs)    /* all sources excluded */
1051                 return false;
1052         return true;
1053 }
1054
1055 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1056                             const struct in6_addr *srcs)
1057 {
1058         struct ip6_sf_list *psf;
1059         int i, scount;
1060
1061         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1062                 return mld_xmarksources(pmc, nsrcs, srcs);
1063
1064         /* mark INCLUDE-mode sources */
1065
1066         scount = 0;
1067         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1068                 if (scount == nsrcs)
1069                         break;
1070                 for (i=0; i<nsrcs; i++) {
1071                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1072                                 psf->sf_gsresp = 1;
1073                                 scount++;
1074                                 break;
1075                         }
1076                 }
1077         }
1078         if (!scount) {
1079                 pmc->mca_flags &= ~MAF_GSQUERY;
1080                 return false;
1081         }
1082         pmc->mca_flags |= MAF_GSQUERY;
1083         return true;
1084 }
1085
1086 /* called with rcu_read_lock() */
1087 int igmp6_event_query(struct sk_buff *skb)
1088 {
1089         struct mld2_query *mlh2 = NULL;
1090         struct ifmcaddr6 *ma;
1091         const struct in6_addr *group;
1092         unsigned long max_delay;
1093         struct inet6_dev *idev;
1094         struct mld_msg *mld;
1095         int group_type;
1096         int mark = 0;
1097         int len;
1098
1099         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1100                 return -EINVAL;
1101
1102         /* compute payload length excluding extension headers */
1103         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1104         len -= skb_network_header_len(skb);
1105
1106         /* Drop queries with not link local source */
1107         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1108                 return -EINVAL;
1109
1110         idev = __in6_dev_get(skb->dev);
1111
1112         if (idev == NULL)
1113                 return 0;
1114
1115         mld = (struct mld_msg *)icmp6_hdr(skb);
1116         group = &mld->mld_mca;
1117         group_type = ipv6_addr_type(group);
1118
1119         if (group_type != IPV6_ADDR_ANY &&
1120             !(group_type&IPV6_ADDR_MULTICAST))
1121                 return -EINVAL;
1122
1123         if (len == 24) {
1124                 int switchback;
1125                 /* MLDv1 router present */
1126
1127                 /* Translate milliseconds to jiffies */
1128                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1129
1130                 switchback = (idev->mc_qrv + 1) * max_delay;
1131                 idev->mc_v1_seen = jiffies + switchback;
1132
1133                 /* cancel the interface change timer */
1134                 idev->mc_ifc_count = 0;
1135                 if (del_timer(&idev->mc_ifc_timer))
1136                         __in6_dev_put(idev);
1137                 /* clear deleted report items */
1138                 mld_clear_delrec(idev);
1139         } else if (len >= 28) {
1140                 int srcs_offset = sizeof(struct mld2_query) -
1141                                   sizeof(struct icmp6hdr);
1142                 if (!pskb_may_pull(skb, srcs_offset))
1143                         return -EINVAL;
1144
1145                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1146                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1147                 if (!max_delay)
1148                         max_delay = 1;
1149                 idev->mc_maxdelay = max_delay;
1150                 if (mlh2->mld2q_qrv)
1151                         idev->mc_qrv = mlh2->mld2q_qrv;
1152                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1153                         if (mlh2->mld2q_nsrcs)
1154                                 return -EINVAL; /* no sources allowed */
1155
1156                         mld_gq_start_timer(idev);
1157                         return 0;
1158                 }
1159                 /* mark sources to include, if group & source-specific */
1160                 if (mlh2->mld2q_nsrcs != 0) {
1161                         if (!pskb_may_pull(skb, srcs_offset +
1162                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1163                                 return -EINVAL;
1164
1165                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1166                         mark = 1;
1167                 }
1168         } else
1169                 return -EINVAL;
1170
1171         read_lock_bh(&idev->lock);
1172         if (group_type == IPV6_ADDR_ANY) {
1173                 for (ma = idev->mc_list; ma; ma=ma->next) {
1174                         spin_lock_bh(&ma->mca_lock);
1175                         igmp6_group_queried(ma, max_delay);
1176                         spin_unlock_bh(&ma->mca_lock);
1177                 }
1178         } else {
1179                 for (ma = idev->mc_list; ma; ma=ma->next) {
1180                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1181                                 continue;
1182                         spin_lock_bh(&ma->mca_lock);
1183                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1184                                 /* gsquery <- gsquery && mark */
1185                                 if (!mark)
1186                                         ma->mca_flags &= ~MAF_GSQUERY;
1187                         } else {
1188                                 /* gsquery <- mark */
1189                                 if (mark)
1190                                         ma->mca_flags |= MAF_GSQUERY;
1191                                 else
1192                                         ma->mca_flags &= ~MAF_GSQUERY;
1193                         }
1194                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1195                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1196                                 igmp6_group_queried(ma, max_delay);
1197                         spin_unlock_bh(&ma->mca_lock);
1198                         break;
1199                 }
1200         }
1201         read_unlock_bh(&idev->lock);
1202
1203         return 0;
1204 }
1205
1206 /* called with rcu_read_lock() */
1207 int igmp6_event_report(struct sk_buff *skb)
1208 {
1209         struct ifmcaddr6 *ma;
1210         struct inet6_dev *idev;
1211         struct mld_msg *mld;
1212         int addr_type;
1213
1214         /* Our own report looped back. Ignore it. */
1215         if (skb->pkt_type == PACKET_LOOPBACK)
1216                 return 0;
1217
1218         /* send our report if the MC router may not have heard this report */
1219         if (skb->pkt_type != PACKET_MULTICAST &&
1220             skb->pkt_type != PACKET_BROADCAST)
1221                 return 0;
1222
1223         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1224                 return -EINVAL;
1225
1226         mld = (struct mld_msg *)icmp6_hdr(skb);
1227
1228         /* Drop reports with not link local source */
1229         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1230         if (addr_type != IPV6_ADDR_ANY &&
1231             !(addr_type&IPV6_ADDR_LINKLOCAL))
1232                 return -EINVAL;
1233
1234         idev = __in6_dev_get(skb->dev);
1235         if (idev == NULL)
1236                 return -ENODEV;
1237
1238         /*
1239          *      Cancel the timer for this group
1240          */
1241
1242         read_lock_bh(&idev->lock);
1243         for (ma = idev->mc_list; ma; ma=ma->next) {
1244                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1245                         spin_lock(&ma->mca_lock);
1246                         if (del_timer(&ma->mca_timer))
1247                                 atomic_dec(&ma->mca_refcnt);
1248                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1249                         spin_unlock(&ma->mca_lock);
1250                         break;
1251                 }
1252         }
1253         read_unlock_bh(&idev->lock);
1254         return 0;
1255 }
1256
1257 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1258                   int gdeleted, int sdeleted)
1259 {
1260         switch (type) {
1261         case MLD2_MODE_IS_INCLUDE:
1262         case MLD2_MODE_IS_EXCLUDE:
1263                 if (gdeleted || sdeleted)
1264                         return false;
1265                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1266                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1267                                 return true;
1268                         /* don't include if this source is excluded
1269                          * in all filters
1270                          */
1271                         if (psf->sf_count[MCAST_INCLUDE])
1272                                 return type == MLD2_MODE_IS_INCLUDE;
1273                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1274                                 psf->sf_count[MCAST_EXCLUDE];
1275                 }
1276                 return false;
1277         case MLD2_CHANGE_TO_INCLUDE:
1278                 if (gdeleted || sdeleted)
1279                         return false;
1280                 return psf->sf_count[MCAST_INCLUDE] != 0;
1281         case MLD2_CHANGE_TO_EXCLUDE:
1282                 if (gdeleted || sdeleted)
1283                         return false;
1284                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1285                     psf->sf_count[MCAST_INCLUDE])
1286                         return false;
1287                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1288                         psf->sf_count[MCAST_EXCLUDE];
1289         case MLD2_ALLOW_NEW_SOURCES:
1290                 if (gdeleted || !psf->sf_crcount)
1291                         return false;
1292                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1293         case MLD2_BLOCK_OLD_SOURCES:
1294                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1295                         return gdeleted || (psf->sf_crcount && sdeleted);
1296                 return psf->sf_crcount && !gdeleted && !sdeleted;
1297         }
1298         return false;
1299 }
1300
1301 static int
1302 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1303 {
1304         struct ip6_sf_list *psf;
1305         int scount = 0;
1306
1307         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1308                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1309                         continue;
1310                 scount++;
1311         }
1312         return scount;
1313 }
1314
1315 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1316                        struct net_device *dev,
1317                        const struct in6_addr *saddr,
1318                        const struct in6_addr *daddr,
1319                        int proto, int len)
1320 {
1321         struct ipv6hdr *hdr;
1322
1323         skb->protocol = htons(ETH_P_IPV6);
1324         skb->dev = dev;
1325
1326         skb_reset_network_header(skb);
1327         skb_put(skb, sizeof(struct ipv6hdr));
1328         hdr = ipv6_hdr(skb);
1329
1330         ip6_flow_hdr(hdr, 0, 0);
1331
1332         hdr->payload_len = htons(len);
1333         hdr->nexthdr = proto;
1334         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1335
1336         hdr->saddr = *saddr;
1337         hdr->daddr = *daddr;
1338 }
1339
1340 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1341 {
1342         struct net *net = dev_net(dev);
1343         struct sock *sk = net->ipv6.igmp_sk;
1344         struct sk_buff *skb;
1345         struct mld2_report *pmr;
1346         struct in6_addr addr_buf;
1347         const struct in6_addr *saddr;
1348         int hlen = LL_RESERVED_SPACE(dev);
1349         int tlen = dev->needed_tailroom;
1350         int err;
1351         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1352                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1353                      IPV6_TLV_PADN, 0 };
1354
1355         /* we assume size > sizeof(ra) here */
1356         size += hlen + tlen;
1357         /* limit our allocations to order-0 page */
1358         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1359         skb = sock_alloc_send_skb(sk, size, 1, &err);
1360
1361         if (!skb)
1362                 return NULL;
1363
1364         skb_reserve(skb, hlen);
1365
1366         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1367                 /* <draft-ietf-magma-mld-source-05.txt>:
1368                  * use unspecified address as the source address
1369                  * when a valid link-local address is not available.
1370                  */
1371                 saddr = &in6addr_any;
1372         } else
1373                 saddr = &addr_buf;
1374
1375         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1376
1377         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1378
1379         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1380         skb_put(skb, sizeof(*pmr));
1381         pmr = (struct mld2_report *)skb_transport_header(skb);
1382         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1383         pmr->mld2r_resv1 = 0;
1384         pmr->mld2r_cksum = 0;
1385         pmr->mld2r_resv2 = 0;
1386         pmr->mld2r_ngrec = 0;
1387         return skb;
1388 }
1389
1390 static void mld_sendpack(struct sk_buff *skb)
1391 {
1392         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1393         struct mld2_report *pmr =
1394                               (struct mld2_report *)skb_transport_header(skb);
1395         int payload_len, mldlen;
1396         struct inet6_dev *idev;
1397         struct net *net = dev_net(skb->dev);
1398         int err;
1399         struct flowi6 fl6;
1400         struct dst_entry *dst;
1401
1402         rcu_read_lock();
1403         idev = __in6_dev_get(skb->dev);
1404         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1405
1406         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1407         mldlen = skb->tail - skb->transport_header;
1408         pip6->payload_len = htons(payload_len);
1409
1410         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1411                                            IPPROTO_ICMPV6,
1412                                            csum_partial(skb_transport_header(skb),
1413                                                         mldlen, 0));
1414
1415         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1416                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1417                          skb->dev->ifindex);
1418         dst = icmp6_dst_alloc(skb->dev, &fl6);
1419
1420         err = 0;
1421         if (IS_ERR(dst)) {
1422                 err = PTR_ERR(dst);
1423                 dst = NULL;
1424         }
1425         skb_dst_set(skb, dst);
1426         if (err)
1427                 goto err_out;
1428
1429         payload_len = skb->len;
1430
1431         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1432                       dst_output);
1433 out:
1434         if (!err) {
1435                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1436                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1437                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1438         } else
1439                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1440
1441         rcu_read_unlock();
1442         return;
1443
1444 err_out:
1445         kfree_skb(skb);
1446         goto out;
1447 }
1448
1449 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1450 {
1451         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1452 }
1453
1454 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1455         int type, struct mld2_grec **ppgr)
1456 {
1457         struct net_device *dev = pmc->idev->dev;
1458         struct mld2_report *pmr;
1459         struct mld2_grec *pgr;
1460
1461         if (!skb)
1462                 skb = mld_newpack(dev, dev->mtu);
1463         if (!skb)
1464                 return NULL;
1465         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1466         pgr->grec_type = type;
1467         pgr->grec_auxwords = 0;
1468         pgr->grec_nsrcs = 0;
1469         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1470         pmr = (struct mld2_report *)skb_transport_header(skb);
1471         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1472         *ppgr = pgr;
1473         return skb;
1474 }
1475
1476 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1477         skb_tailroom(skb)) : 0)
1478
1479 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1480         int type, int gdeleted, int sdeleted)
1481 {
1482         struct net_device *dev = pmc->idev->dev;
1483         struct mld2_report *pmr;
1484         struct mld2_grec *pgr = NULL;
1485         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1486         int scount, stotal, first, isquery, truncate;
1487
1488         if (pmc->mca_flags & MAF_NOREPORT)
1489                 return skb;
1490
1491         isquery = type == MLD2_MODE_IS_INCLUDE ||
1492                   type == MLD2_MODE_IS_EXCLUDE;
1493         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1494                     type == MLD2_CHANGE_TO_EXCLUDE;
1495
1496         stotal = scount = 0;
1497
1498         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1499
1500         if (!*psf_list)
1501                 goto empty_source;
1502
1503         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1504
1505         /* EX and TO_EX get a fresh packet, if needed */
1506         if (truncate) {
1507                 if (pmr && pmr->mld2r_ngrec &&
1508                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1509                         if (skb)
1510                                 mld_sendpack(skb);
1511                         skb = mld_newpack(dev, dev->mtu);
1512                 }
1513         }
1514         first = 1;
1515         psf_prev = NULL;
1516         for (psf=*psf_list; psf; psf=psf_next) {
1517                 struct in6_addr *psrc;
1518
1519                 psf_next = psf->sf_next;
1520
1521                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1522                         psf_prev = psf;
1523                         continue;
1524                 }
1525
1526                 /* clear marks on query responses */
1527                 if (isquery)
1528                         psf->sf_gsresp = 0;
1529
1530                 if (AVAILABLE(skb) < sizeof(*psrc) +
1531                     first*sizeof(struct mld2_grec)) {
1532                         if (truncate && !first)
1533                                 break;   /* truncate these */
1534                         if (pgr)
1535                                 pgr->grec_nsrcs = htons(scount);
1536                         if (skb)
1537                                 mld_sendpack(skb);
1538                         skb = mld_newpack(dev, dev->mtu);
1539                         first = 1;
1540                         scount = 0;
1541                 }
1542                 if (first) {
1543                         skb = add_grhead(skb, pmc, type, &pgr);
1544                         first = 0;
1545                 }
1546                 if (!skb)
1547                         return NULL;
1548                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1549                 *psrc = psf->sf_addr;
1550                 scount++; stotal++;
1551                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1552                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1553                         psf->sf_crcount--;
1554                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1555                                 if (psf_prev)
1556                                         psf_prev->sf_next = psf->sf_next;
1557                                 else
1558                                         *psf_list = psf->sf_next;
1559                                 kfree(psf);
1560                                 continue;
1561                         }
1562                 }
1563                 psf_prev = psf;
1564         }
1565
1566 empty_source:
1567         if (!stotal) {
1568                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1569                     type == MLD2_BLOCK_OLD_SOURCES)
1570                         return skb;
1571                 if (pmc->mca_crcount || isquery) {
1572                         /* make sure we have room for group header */
1573                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1574                                 mld_sendpack(skb);
1575                                 skb = NULL; /* add_grhead will get a new one */
1576                         }
1577                         skb = add_grhead(skb, pmc, type, &pgr);
1578                 }
1579         }
1580         if (pgr)
1581                 pgr->grec_nsrcs = htons(scount);
1582
1583         if (isquery)
1584                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1585         return skb;
1586 }
1587
1588 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1589 {
1590         struct sk_buff *skb = NULL;
1591         int type;
1592
1593         if (!pmc) {
1594                 read_lock_bh(&idev->lock);
1595                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1596                         if (pmc->mca_flags & MAF_NOREPORT)
1597                                 continue;
1598                         spin_lock_bh(&pmc->mca_lock);
1599                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1600                                 type = MLD2_MODE_IS_EXCLUDE;
1601                         else
1602                                 type = MLD2_MODE_IS_INCLUDE;
1603                         skb = add_grec(skb, pmc, type, 0, 0);
1604                         spin_unlock_bh(&pmc->mca_lock);
1605                 }
1606                 read_unlock_bh(&idev->lock);
1607         } else {
1608                 spin_lock_bh(&pmc->mca_lock);
1609                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1610                         type = MLD2_MODE_IS_EXCLUDE;
1611                 else
1612                         type = MLD2_MODE_IS_INCLUDE;
1613                 skb = add_grec(skb, pmc, type, 0, 0);
1614                 spin_unlock_bh(&pmc->mca_lock);
1615         }
1616         if (skb)
1617                 mld_sendpack(skb);
1618 }
1619
1620 /*
1621  * remove zero-count source records from a source filter list
1622  */
1623 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1624 {
1625         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1626
1627         psf_prev = NULL;
1628         for (psf=*ppsf; psf; psf = psf_next) {
1629                 psf_next = psf->sf_next;
1630                 if (psf->sf_crcount == 0) {
1631                         if (psf_prev)
1632                                 psf_prev->sf_next = psf->sf_next;
1633                         else
1634                                 *ppsf = psf->sf_next;
1635                         kfree(psf);
1636                 } else
1637                         psf_prev = psf;
1638         }
1639 }
1640
1641 static void mld_send_cr(struct inet6_dev *idev)
1642 {
1643         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1644         struct sk_buff *skb = NULL;
1645         int type, dtype;
1646
1647         read_lock_bh(&idev->lock);
1648         spin_lock(&idev->mc_lock);
1649
1650         /* deleted MCA's */
1651         pmc_prev = NULL;
1652         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1653                 pmc_next = pmc->next;
1654                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1655                         type = MLD2_BLOCK_OLD_SOURCES;
1656                         dtype = MLD2_BLOCK_OLD_SOURCES;
1657                         skb = add_grec(skb, pmc, type, 1, 0);
1658                         skb = add_grec(skb, pmc, dtype, 1, 1);
1659                 }
1660                 if (pmc->mca_crcount) {
1661                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1662                                 type = MLD2_CHANGE_TO_INCLUDE;
1663                                 skb = add_grec(skb, pmc, type, 1, 0);
1664                         }
1665                         pmc->mca_crcount--;
1666                         if (pmc->mca_crcount == 0) {
1667                                 mld_clear_zeros(&pmc->mca_tomb);
1668                                 mld_clear_zeros(&pmc->mca_sources);
1669                         }
1670                 }
1671                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1672                     !pmc->mca_sources) {
1673                         if (pmc_prev)
1674                                 pmc_prev->next = pmc_next;
1675                         else
1676                                 idev->mc_tomb = pmc_next;
1677                         in6_dev_put(pmc->idev);
1678                         kfree(pmc);
1679                 } else
1680                         pmc_prev = pmc;
1681         }
1682         spin_unlock(&idev->mc_lock);
1683
1684         /* change recs */
1685         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1686                 spin_lock_bh(&pmc->mca_lock);
1687                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1688                         type = MLD2_BLOCK_OLD_SOURCES;
1689                         dtype = MLD2_ALLOW_NEW_SOURCES;
1690                 } else {
1691                         type = MLD2_ALLOW_NEW_SOURCES;
1692                         dtype = MLD2_BLOCK_OLD_SOURCES;
1693                 }
1694                 skb = add_grec(skb, pmc, type, 0, 0);
1695                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1696
1697                 /* filter mode changes */
1698                 if (pmc->mca_crcount) {
1699                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1700                                 type = MLD2_CHANGE_TO_EXCLUDE;
1701                         else
1702                                 type = MLD2_CHANGE_TO_INCLUDE;
1703                         skb = add_grec(skb, pmc, type, 0, 0);
1704                         pmc->mca_crcount--;
1705                 }
1706                 spin_unlock_bh(&pmc->mca_lock);
1707         }
1708         read_unlock_bh(&idev->lock);
1709         if (!skb)
1710                 return;
1711         (void) mld_sendpack(skb);
1712 }
1713
1714 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1715 {
1716         struct net *net = dev_net(dev);
1717         struct sock *sk = net->ipv6.igmp_sk;
1718         struct inet6_dev *idev;
1719         struct sk_buff *skb;
1720         struct mld_msg *hdr;
1721         const struct in6_addr *snd_addr, *saddr;
1722         struct in6_addr addr_buf;
1723         int hlen = LL_RESERVED_SPACE(dev);
1724         int tlen = dev->needed_tailroom;
1725         int err, len, payload_len, full_len;
1726         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1727                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1728                      IPV6_TLV_PADN, 0 };
1729         struct flowi6 fl6;
1730         struct dst_entry *dst;
1731
1732         if (type == ICMPV6_MGM_REDUCTION)
1733                 snd_addr = &in6addr_linklocal_allrouters;
1734         else
1735                 snd_addr = addr;
1736
1737         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1738         payload_len = len + sizeof(ra);
1739         full_len = sizeof(struct ipv6hdr) + payload_len;
1740
1741         rcu_read_lock();
1742         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1743                       IPSTATS_MIB_OUT, full_len);
1744         rcu_read_unlock();
1745
1746         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1747
1748         if (skb == NULL) {
1749                 rcu_read_lock();
1750                 IP6_INC_STATS(net, __in6_dev_get(dev),
1751                               IPSTATS_MIB_OUTDISCARDS);
1752                 rcu_read_unlock();
1753                 return;
1754         }
1755
1756         skb_reserve(skb, hlen);
1757
1758         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1759                 /* <draft-ietf-magma-mld-source-05.txt>:
1760                  * use unspecified address as the source address
1761                  * when a valid link-local address is not available.
1762                  */
1763                 saddr = &in6addr_any;
1764         } else
1765                 saddr = &addr_buf;
1766
1767         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1768
1769         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1770
1771         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1772         memset(hdr, 0, sizeof(struct mld_msg));
1773         hdr->mld_type = type;
1774         hdr->mld_mca = *addr;
1775
1776         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1777                                          IPPROTO_ICMPV6,
1778                                          csum_partial(hdr, len, 0));
1779
1780         rcu_read_lock();
1781         idev = __in6_dev_get(skb->dev);
1782
1783         icmpv6_flow_init(sk, &fl6, type,
1784                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1785                          skb->dev->ifindex);
1786         dst = icmp6_dst_alloc(skb->dev, &fl6);
1787         if (IS_ERR(dst)) {
1788                 err = PTR_ERR(dst);
1789                 goto err_out;
1790         }
1791
1792         skb_dst_set(skb, dst);
1793         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1794                       dst_output);
1795 out:
1796         if (!err) {
1797                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1798                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1799                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1800         } else
1801                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1802
1803         rcu_read_unlock();
1804         return;
1805
1806 err_out:
1807         kfree_skb(skb);
1808         goto out;
1809 }
1810
1811 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1812         const struct in6_addr *psfsrc)
1813 {
1814         struct ip6_sf_list *psf, *psf_prev;
1815         int rv = 0;
1816
1817         psf_prev = NULL;
1818         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1819                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1820                         break;
1821                 psf_prev = psf;
1822         }
1823         if (!psf || psf->sf_count[sfmode] == 0) {
1824                 /* source filter not found, or count wrong =>  bug */
1825                 return -ESRCH;
1826         }
1827         psf->sf_count[sfmode]--;
1828         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1829                 struct inet6_dev *idev = pmc->idev;
1830
1831                 /* no more filters for this source */
1832                 if (psf_prev)
1833                         psf_prev->sf_next = psf->sf_next;
1834                 else
1835                         pmc->mca_sources = psf->sf_next;
1836                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1837                     !MLD_V1_SEEN(idev)) {
1838                         psf->sf_crcount = idev->mc_qrv;
1839                         psf->sf_next = pmc->mca_tomb;
1840                         pmc->mca_tomb = psf;
1841                         rv = 1;
1842                 } else
1843                         kfree(psf);
1844         }
1845         return rv;
1846 }
1847
1848 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1849                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1850                           int delta)
1851 {
1852         struct ifmcaddr6 *pmc;
1853         int     changerec = 0;
1854         int     i, err;
1855
1856         if (!idev)
1857                 return -ENODEV;
1858         read_lock_bh(&idev->lock);
1859         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1860                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1861                         break;
1862         }
1863         if (!pmc) {
1864                 /* MCA not found?? bug */
1865                 read_unlock_bh(&idev->lock);
1866                 return -ESRCH;
1867         }
1868         spin_lock_bh(&pmc->mca_lock);
1869         sf_markstate(pmc);
1870         if (!delta) {
1871                 if (!pmc->mca_sfcount[sfmode]) {
1872                         spin_unlock_bh(&pmc->mca_lock);
1873                         read_unlock_bh(&idev->lock);
1874                         return -EINVAL;
1875                 }
1876                 pmc->mca_sfcount[sfmode]--;
1877         }
1878         err = 0;
1879         for (i=0; i<sfcount; i++) {
1880                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1881
1882                 changerec |= rv > 0;
1883                 if (!err && rv < 0)
1884                         err = rv;
1885         }
1886         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1887             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1888             pmc->mca_sfcount[MCAST_INCLUDE]) {
1889                 struct ip6_sf_list *psf;
1890
1891                 /* filter mode change */
1892                 pmc->mca_sfmode = MCAST_INCLUDE;
1893                 pmc->mca_crcount = idev->mc_qrv;
1894                 idev->mc_ifc_count = pmc->mca_crcount;
1895                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1896                         psf->sf_crcount = 0;
1897                 mld_ifc_event(pmc->idev);
1898         } else if (sf_setstate(pmc) || changerec)
1899                 mld_ifc_event(pmc->idev);
1900         spin_unlock_bh(&pmc->mca_lock);
1901         read_unlock_bh(&idev->lock);
1902         return err;
1903 }
1904
1905 /*
1906  * Add multicast single-source filter to the interface list
1907  */
1908 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1909         const struct in6_addr *psfsrc)
1910 {
1911         struct ip6_sf_list *psf, *psf_prev;
1912
1913         psf_prev = NULL;
1914         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1915                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1916                         break;
1917                 psf_prev = psf;
1918         }
1919         if (!psf) {
1920                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1921                 if (!psf)
1922                         return -ENOBUFS;
1923
1924                 psf->sf_addr = *psfsrc;
1925                 if (psf_prev) {
1926                         psf_prev->sf_next = psf;
1927                 } else
1928                         pmc->mca_sources = psf;
1929         }
1930         psf->sf_count[sfmode]++;
1931         return 0;
1932 }
1933
1934 static void sf_markstate(struct ifmcaddr6 *pmc)
1935 {
1936         struct ip6_sf_list *psf;
1937         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1938
1939         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1940                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1941                         psf->sf_oldin = mca_xcount ==
1942                                 psf->sf_count[MCAST_EXCLUDE] &&
1943                                 !psf->sf_count[MCAST_INCLUDE];
1944                 } else
1945                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1946 }
1947
1948 static int sf_setstate(struct ifmcaddr6 *pmc)
1949 {
1950         struct ip6_sf_list *psf, *dpsf;
1951         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1952         int qrv = pmc->idev->mc_qrv;
1953         int new_in, rv;
1954
1955         rv = 0;
1956         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1957                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1958                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1959                                 !psf->sf_count[MCAST_INCLUDE];
1960                 } else
1961                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1962                 if (new_in) {
1963                         if (!psf->sf_oldin) {
1964                                 struct ip6_sf_list *prev = NULL;
1965
1966                                 for (dpsf=pmc->mca_tomb; dpsf;
1967                                      dpsf=dpsf->sf_next) {
1968                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1969                                             &psf->sf_addr))
1970                                                 break;
1971                                         prev = dpsf;
1972                                 }
1973                                 if (dpsf) {
1974                                         if (prev)
1975                                                 prev->sf_next = dpsf->sf_next;
1976                                         else
1977                                                 pmc->mca_tomb = dpsf->sf_next;
1978                                         kfree(dpsf);
1979                                 }
1980                                 psf->sf_crcount = qrv;
1981                                 rv++;
1982                         }
1983                 } else if (psf->sf_oldin) {
1984                         psf->sf_crcount = 0;
1985                         /*
1986                          * add or update "delete" records if an active filter
1987                          * is now inactive
1988                          */
1989                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1990                                 if (ipv6_addr_equal(&dpsf->sf_addr,
1991                                     &psf->sf_addr))
1992                                         break;
1993                         if (!dpsf) {
1994                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1995                                 if (!dpsf)
1996                                         continue;
1997                                 *dpsf = *psf;
1998                                 /* pmc->mca_lock held by callers */
1999                                 dpsf->sf_next = pmc->mca_tomb;
2000                                 pmc->mca_tomb = dpsf;
2001                         }
2002                         dpsf->sf_crcount = qrv;
2003                         rv++;
2004                 }
2005         }
2006         return rv;
2007 }
2008
2009 /*
2010  * Add multicast source filter list to the interface list
2011  */
2012 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2013                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2014                           int delta)
2015 {
2016         struct ifmcaddr6 *pmc;
2017         int     isexclude;
2018         int     i, err;
2019
2020         if (!idev)
2021                 return -ENODEV;
2022         read_lock_bh(&idev->lock);
2023         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2024                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2025                         break;
2026         }
2027         if (!pmc) {
2028                 /* MCA not found?? bug */
2029                 read_unlock_bh(&idev->lock);
2030                 return -ESRCH;
2031         }
2032         spin_lock_bh(&pmc->mca_lock);
2033
2034         sf_markstate(pmc);
2035         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2036         if (!delta)
2037                 pmc->mca_sfcount[sfmode]++;
2038         err = 0;
2039         for (i=0; i<sfcount; i++) {
2040                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2041                 if (err)
2042                         break;
2043         }
2044         if (err) {
2045                 int j;
2046
2047                 if (!delta)
2048                         pmc->mca_sfcount[sfmode]--;
2049                 for (j=0; j<i; j++)
2050                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2051         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2052                 struct ip6_sf_list *psf;
2053
2054                 /* filter mode change */
2055                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2056                         pmc->mca_sfmode = MCAST_EXCLUDE;
2057                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2058                         pmc->mca_sfmode = MCAST_INCLUDE;
2059                 /* else no filters; keep old mode for reports */
2060
2061                 pmc->mca_crcount = idev->mc_qrv;
2062                 idev->mc_ifc_count = pmc->mca_crcount;
2063                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2064                         psf->sf_crcount = 0;
2065                 mld_ifc_event(idev);
2066         } else if (sf_setstate(pmc))
2067                 mld_ifc_event(idev);
2068         spin_unlock_bh(&pmc->mca_lock);
2069         read_unlock_bh(&idev->lock);
2070         return err;
2071 }
2072
2073 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2074 {
2075         struct ip6_sf_list *psf, *nextpsf;
2076
2077         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2078                 nextpsf = psf->sf_next;
2079                 kfree(psf);
2080         }
2081         pmc->mca_tomb = NULL;
2082         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2083                 nextpsf = psf->sf_next;
2084                 kfree(psf);
2085         }
2086         pmc->mca_sources = NULL;
2087         pmc->mca_sfmode = MCAST_EXCLUDE;
2088         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2089         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2090 }
2091
2092
2093 static void igmp6_join_group(struct ifmcaddr6 *ma)
2094 {
2095         unsigned long delay;
2096
2097         if (ma->mca_flags & MAF_NOREPORT)
2098                 return;
2099
2100         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2101
2102         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2103
2104         spin_lock_bh(&ma->mca_lock);
2105         if (del_timer(&ma->mca_timer)) {
2106                 atomic_dec(&ma->mca_refcnt);
2107                 delay = ma->mca_timer.expires - jiffies;
2108         }
2109
2110         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2111                 atomic_inc(&ma->mca_refcnt);
2112         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2113         spin_unlock_bh(&ma->mca_lock);
2114 }
2115
2116 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2117                             struct inet6_dev *idev)
2118 {
2119         int err;
2120
2121         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2122          * so no other readers or writers of iml or its sflist
2123          */
2124         if (!iml->sflist) {
2125                 /* any-source empty exclude case */
2126                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2127         }
2128         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2129                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2130         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2131         iml->sflist = NULL;
2132         return err;
2133 }
2134
2135 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2136 {
2137         if (MLD_V1_SEEN(ma->idev)) {
2138                 if (ma->mca_flags & MAF_LAST_REPORTER)
2139                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2140                                 ICMPV6_MGM_REDUCTION);
2141         } else {
2142                 mld_add_delrec(ma->idev, ma);
2143                 mld_ifc_event(ma->idev);
2144         }
2145 }
2146
2147 static void mld_gq_timer_expire(unsigned long data)
2148 {
2149         struct inet6_dev *idev = (struct inet6_dev *)data;
2150
2151         idev->mc_gq_running = 0;
2152         mld_send_report(idev, NULL);
2153         __in6_dev_put(idev);
2154 }
2155
2156 static void mld_ifc_timer_expire(unsigned long data)
2157 {
2158         struct inet6_dev *idev = (struct inet6_dev *)data;
2159
2160         mld_send_cr(idev);
2161         if (idev->mc_ifc_count) {
2162                 idev->mc_ifc_count--;
2163                 if (idev->mc_ifc_count)
2164                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2165         }
2166         __in6_dev_put(idev);
2167 }
2168
2169 static void mld_ifc_event(struct inet6_dev *idev)
2170 {
2171         if (MLD_V1_SEEN(idev))
2172                 return;
2173         idev->mc_ifc_count = idev->mc_qrv;
2174         mld_ifc_start_timer(idev, 1);
2175 }
2176
2177
2178 static void igmp6_timer_handler(unsigned long data)
2179 {
2180         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2181
2182         if (MLD_V1_SEEN(ma->idev))
2183                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2184         else
2185                 mld_send_report(ma->idev, ma);
2186
2187         spin_lock(&ma->mca_lock);
2188         ma->mca_flags |=  MAF_LAST_REPORTER;
2189         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2190         spin_unlock(&ma->mca_lock);
2191         ma_put(ma);
2192 }
2193
2194 /* Device changing type */
2195
2196 void ipv6_mc_unmap(struct inet6_dev *idev)
2197 {
2198         struct ifmcaddr6 *i;
2199
2200         /* Install multicast list, except for all-nodes (already installed) */
2201
2202         read_lock_bh(&idev->lock);
2203         for (i = idev->mc_list; i; i = i->next)
2204                 igmp6_group_dropped(i);
2205         read_unlock_bh(&idev->lock);
2206 }
2207
2208 void ipv6_mc_remap(struct inet6_dev *idev)
2209 {
2210         ipv6_mc_up(idev);
2211 }
2212
2213 /* Device going down */
2214
2215 void ipv6_mc_down(struct inet6_dev *idev)
2216 {
2217         struct ifmcaddr6 *i;
2218
2219         /* Withdraw multicast list */
2220
2221         read_lock_bh(&idev->lock);
2222         idev->mc_ifc_count = 0;
2223         if (del_timer(&idev->mc_ifc_timer))
2224                 __in6_dev_put(idev);
2225         idev->mc_gq_running = 0;
2226         if (del_timer(&idev->mc_gq_timer))
2227                 __in6_dev_put(idev);
2228
2229         for (i = idev->mc_list; i; i=i->next)
2230                 igmp6_group_dropped(i);
2231         read_unlock_bh(&idev->lock);
2232
2233         mld_clear_delrec(idev);
2234 }
2235
2236
2237 /* Device going up */
2238
2239 void ipv6_mc_up(struct inet6_dev *idev)
2240 {
2241         struct ifmcaddr6 *i;
2242
2243         /* Install multicast list, except for all-nodes (already installed) */
2244
2245         read_lock_bh(&idev->lock);
2246         for (i = idev->mc_list; i; i=i->next)
2247                 igmp6_group_added(i);
2248         read_unlock_bh(&idev->lock);
2249 }
2250
2251 /* IPv6 device initialization. */
2252
2253 void ipv6_mc_init_dev(struct inet6_dev *idev)
2254 {
2255         write_lock_bh(&idev->lock);
2256         spin_lock_init(&idev->mc_lock);
2257         idev->mc_gq_running = 0;
2258         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2259                         (unsigned long)idev);
2260         idev->mc_tomb = NULL;
2261         idev->mc_ifc_count = 0;
2262         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2263                         (unsigned long)idev);
2264         idev->mc_qrv = MLD_QRV_DEFAULT;
2265         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2266         idev->mc_v1_seen = 0;
2267         write_unlock_bh(&idev->lock);
2268 }
2269
2270 /*
2271  *      Device is about to be destroyed: clean up.
2272  */
2273
2274 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2275 {
2276         struct ifmcaddr6 *i;
2277
2278         /* Deactivate timers */
2279         ipv6_mc_down(idev);
2280
2281         /* Delete all-nodes address. */
2282         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2283          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2284          * fail.
2285          */
2286         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2287
2288         if (idev->cnf.forwarding)
2289                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2290
2291         write_lock_bh(&idev->lock);
2292         while ((i = idev->mc_list) != NULL) {
2293                 idev->mc_list = i->next;
2294                 write_unlock_bh(&idev->lock);
2295
2296                 igmp6_group_dropped(i);
2297                 ma_put(i);
2298
2299                 write_lock_bh(&idev->lock);
2300         }
2301         write_unlock_bh(&idev->lock);
2302 }
2303
2304 #ifdef CONFIG_PROC_FS
2305 struct igmp6_mc_iter_state {
2306         struct seq_net_private p;
2307         struct net_device *dev;
2308         struct inet6_dev *idev;
2309 };
2310
2311 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2312
2313 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2314 {
2315         struct ifmcaddr6 *im = NULL;
2316         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2317         struct net *net = seq_file_net(seq);
2318
2319         state->idev = NULL;
2320         for_each_netdev_rcu(net, state->dev) {
2321                 struct inet6_dev *idev;
2322                 idev = __in6_dev_get(state->dev);
2323                 if (!idev)
2324                         continue;
2325                 read_lock_bh(&idev->lock);
2326                 im = idev->mc_list;
2327                 if (im) {
2328                         state->idev = idev;
2329                         break;
2330                 }
2331                 read_unlock_bh(&idev->lock);
2332         }
2333         return im;
2334 }
2335
2336 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2337 {
2338         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2339
2340         im = im->next;
2341         while (!im) {
2342                 if (likely(state->idev != NULL))
2343                         read_unlock_bh(&state->idev->lock);
2344
2345                 state->dev = next_net_device_rcu(state->dev);
2346                 if (!state->dev) {
2347                         state->idev = NULL;
2348                         break;
2349                 }
2350                 state->idev = __in6_dev_get(state->dev);
2351                 if (!state->idev)
2352                         continue;
2353                 read_lock_bh(&state->idev->lock);
2354                 im = state->idev->mc_list;
2355         }
2356         return im;
2357 }
2358
2359 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2360 {
2361         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2362         if (im)
2363                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2364                         --pos;
2365         return pos ? NULL : im;
2366 }
2367
2368 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2369         __acquires(RCU)
2370 {
2371         rcu_read_lock();
2372         return igmp6_mc_get_idx(seq, *pos);
2373 }
2374
2375 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2376 {
2377         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2378
2379         ++*pos;
2380         return im;
2381 }
2382
2383 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2384         __releases(RCU)
2385 {
2386         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2387
2388         if (likely(state->idev != NULL)) {
2389                 read_unlock_bh(&state->idev->lock);
2390                 state->idev = NULL;
2391         }
2392         state->dev = NULL;
2393         rcu_read_unlock();
2394 }
2395
2396 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2397 {
2398         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2399         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2400
2401         seq_printf(seq,
2402                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2403                    state->dev->ifindex, state->dev->name,
2404                    &im->mca_addr,
2405                    im->mca_users, im->mca_flags,
2406                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2407                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2408         return 0;
2409 }
2410
2411 static const struct seq_operations igmp6_mc_seq_ops = {
2412         .start  =       igmp6_mc_seq_start,
2413         .next   =       igmp6_mc_seq_next,
2414         .stop   =       igmp6_mc_seq_stop,
2415         .show   =       igmp6_mc_seq_show,
2416 };
2417
2418 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2419 {
2420         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2421                             sizeof(struct igmp6_mc_iter_state));
2422 }
2423
2424 static const struct file_operations igmp6_mc_seq_fops = {
2425         .owner          =       THIS_MODULE,
2426         .open           =       igmp6_mc_seq_open,
2427         .read           =       seq_read,
2428         .llseek         =       seq_lseek,
2429         .release        =       seq_release_net,
2430 };
2431
2432 struct igmp6_mcf_iter_state {
2433         struct seq_net_private p;
2434         struct net_device *dev;
2435         struct inet6_dev *idev;
2436         struct ifmcaddr6 *im;
2437 };
2438
2439 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2440
2441 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2442 {
2443         struct ip6_sf_list *psf = NULL;
2444         struct ifmcaddr6 *im = NULL;
2445         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2446         struct net *net = seq_file_net(seq);
2447
2448         state->idev = NULL;
2449         state->im = NULL;
2450         for_each_netdev_rcu(net, state->dev) {
2451                 struct inet6_dev *idev;
2452                 idev = __in6_dev_get(state->dev);
2453                 if (unlikely(idev == NULL))
2454                         continue;
2455                 read_lock_bh(&idev->lock);
2456                 im = idev->mc_list;
2457                 if (likely(im != NULL)) {
2458                         spin_lock_bh(&im->mca_lock);
2459                         psf = im->mca_sources;
2460                         if (likely(psf != NULL)) {
2461                                 state->im = im;
2462                                 state->idev = idev;
2463                                 break;
2464                         }
2465                         spin_unlock_bh(&im->mca_lock);
2466                 }
2467                 read_unlock_bh(&idev->lock);
2468         }
2469         return psf;
2470 }
2471
2472 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2473 {
2474         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2475
2476         psf = psf->sf_next;
2477         while (!psf) {
2478                 spin_unlock_bh(&state->im->mca_lock);
2479                 state->im = state->im->next;
2480                 while (!state->im) {
2481                         if (likely(state->idev != NULL))
2482                                 read_unlock_bh(&state->idev->lock);
2483
2484                         state->dev = next_net_device_rcu(state->dev);
2485                         if (!state->dev) {
2486                                 state->idev = NULL;
2487                                 goto out;
2488                         }
2489                         state->idev = __in6_dev_get(state->dev);
2490                         if (!state->idev)
2491                                 continue;
2492                         read_lock_bh(&state->idev->lock);
2493                         state->im = state->idev->mc_list;
2494                 }
2495                 if (!state->im)
2496                         break;
2497                 spin_lock_bh(&state->im->mca_lock);
2498                 psf = state->im->mca_sources;
2499         }
2500 out:
2501         return psf;
2502 }
2503
2504 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2505 {
2506         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2507         if (psf)
2508                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2509                         --pos;
2510         return pos ? NULL : psf;
2511 }
2512
2513 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2514         __acquires(RCU)
2515 {
2516         rcu_read_lock();
2517         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2518 }
2519
2520 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2521 {
2522         struct ip6_sf_list *psf;
2523         if (v == SEQ_START_TOKEN)
2524                 psf = igmp6_mcf_get_first(seq);
2525         else
2526                 psf = igmp6_mcf_get_next(seq, v);
2527         ++*pos;
2528         return psf;
2529 }
2530
2531 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2532         __releases(RCU)
2533 {
2534         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2535         if (likely(state->im != NULL)) {
2536                 spin_unlock_bh(&state->im->mca_lock);
2537                 state->im = NULL;
2538         }
2539         if (likely(state->idev != NULL)) {
2540                 read_unlock_bh(&state->idev->lock);
2541                 state->idev = NULL;
2542         }
2543         state->dev = NULL;
2544         rcu_read_unlock();
2545 }
2546
2547 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2548 {
2549         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2550         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2551
2552         if (v == SEQ_START_TOKEN) {
2553                 seq_printf(seq,
2554                            "%3s %6s "
2555                            "%32s %32s %6s %6s\n", "Idx",
2556                            "Device", "Multicast Address",
2557                            "Source Address", "INC", "EXC");
2558         } else {
2559                 seq_printf(seq,
2560                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2561                            state->dev->ifindex, state->dev->name,
2562                            &state->im->mca_addr,
2563                            &psf->sf_addr,
2564                            psf->sf_count[MCAST_INCLUDE],
2565                            psf->sf_count[MCAST_EXCLUDE]);
2566         }
2567         return 0;
2568 }
2569
2570 static const struct seq_operations igmp6_mcf_seq_ops = {
2571         .start  =       igmp6_mcf_seq_start,
2572         .next   =       igmp6_mcf_seq_next,
2573         .stop   =       igmp6_mcf_seq_stop,
2574         .show   =       igmp6_mcf_seq_show,
2575 };
2576
2577 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2578 {
2579         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2580                             sizeof(struct igmp6_mcf_iter_state));
2581 }
2582
2583 static const struct file_operations igmp6_mcf_seq_fops = {
2584         .owner          =       THIS_MODULE,
2585         .open           =       igmp6_mcf_seq_open,
2586         .read           =       seq_read,
2587         .llseek         =       seq_lseek,
2588         .release        =       seq_release_net,
2589 };
2590
2591 static int __net_init igmp6_proc_init(struct net *net)
2592 {
2593         int err;
2594
2595         err = -ENOMEM;
2596         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2597                 goto out;
2598         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2599                                   &igmp6_mcf_seq_fops))
2600                 goto out_proc_net_igmp6;
2601
2602         err = 0;
2603 out:
2604         return err;
2605
2606 out_proc_net_igmp6:
2607         proc_net_remove(net, "igmp6");
2608         goto out;
2609 }
2610
2611 static void __net_exit igmp6_proc_exit(struct net *net)
2612 {
2613         proc_net_remove(net, "mcfilter6");
2614         proc_net_remove(net, "igmp6");
2615 }
2616 #else
2617 static inline int igmp6_proc_init(struct net *net)
2618 {
2619         return 0;
2620 }
2621 static inline void igmp6_proc_exit(struct net *net)
2622 {
2623 }
2624 #endif
2625
2626 static int __net_init igmp6_net_init(struct net *net)
2627 {
2628         int err;
2629
2630         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2631                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2632         if (err < 0) {
2633                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2634                        err);
2635                 goto out;
2636         }
2637
2638         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2639
2640         err = igmp6_proc_init(net);
2641         if (err)
2642                 goto out_sock_create;
2643 out:
2644         return err;
2645
2646 out_sock_create:
2647         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2648         goto out;
2649 }
2650
2651 static void __net_exit igmp6_net_exit(struct net *net)
2652 {
2653         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2654         igmp6_proc_exit(net);
2655 }
2656
2657 static struct pernet_operations igmp6_net_ops = {
2658         .init = igmp6_net_init,
2659         .exit = igmp6_net_exit,
2660 };
2661
2662 int __init igmp6_init(void)
2663 {
2664         return register_pernet_subsys(&igmp6_net_ops);
2665 }
2666
2667 void igmp6_cleanup(void)
2668 {
2669         unregister_pernet_subsys(&igmp6_net_ops);
2670 }