net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <[email protected]>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <[email protected]>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <linux/pkt_sched.h>
  48 #include <net/mld.h>
  49
  50 #include <linux/netfilter.h>
  51 #include <linux/netfilter_ipv6.h>
  52
  53 #include <net/net_namespace.h>
  54 #include <net/sock.h>
  55 #include <net/snmp.h>
  56
  57 #include <net/ipv6.h>
  58 #include <net/protocol.h>
  59 #include <net/if_inet6.h>
  60 #include <net/ndisc.h>
  61 #include <net/addrconf.h>
  62 #include <net/ip6_route.h>
  63 #include <net/inet_common.h>
  64
  65 #include <net/ip6_checksum.h>
  66
  67 /* Set to 3 to get tracing... */
  68 #define MCAST_DEBUG 2
  69
  70 #if MCAST_DEBUG >= 3
  71 #define MDBG(x) printk x
  72 #else
  73 #define MDBG(x)
  74 #endif
  75
  76 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  77 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  80         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  81 };
  82
  83 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  84
  85 /* Big mc list lock for all the sockets */
  86 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  87
  88 static void igmp6_join_group(struct ifmcaddr6 *ma);
  89 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  90 static void igmp6_timer_handler(unsigned long data);
  91
  92 static void mld_gq_timer_expire(unsigned long data);
  93 static void mld_ifc_timer_expire(unsigned long data);
  94 static void mld_ifc_event(struct inet6_dev *idev);
  95 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  96 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  97 static void mld_clear_delrec(struct inet6_dev *idev);
  98 static bool mld_in_v1_mode(const struct inet6_dev *idev);
  99 static int sf_setstate(struct ifmcaddr6 *pmc);
 100 static void sf_markstate(struct ifmcaddr6 *pmc);
 101 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 102 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 103                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 104                           int delta);
 105 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 106                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 107                           int delta);
 108 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 109                             struct inet6_dev *idev);
 110
 111 #define MLD_QRV_DEFAULT         2
 112 /* RFC3810, 9.2. Query Interval */
 113 #define MLD_QI_DEFAULT          (125 * HZ)
 114 /* RFC3810, 9.3. Query Response Interval */
 115 #define MLD_QRI_DEFAULT         (10 * HZ)
 116
 117 /* RFC3810, 8.1 Query Version Distinctions */
 118 #define MLD_V1_QUERY_LEN        24
 119 #define MLD_V2_QUERY_LEN_MIN    28
 120
 121 #define IPV6_MLD_MAX_MSF        64
 122
 123 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 124
 125 /*
 126  *      socket join on multicast group
 127  */
 128
 129 #define for_each_pmc_rcu(np, pmc)                               \
 130         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 131              pmc != NULL;                                       \
 132              pmc = rcu_dereference(pmc->next))
 133
 134 static int unsolicited_report_interval(struct inet6_dev *idev)
 135 {
 136         int iv;
 137
 138         if (mld_in_v1_mode(idev))
 139                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 140         else
 141                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 142
 143         return iv > 0 ? iv : 1;
 144 }
 145
 146 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 147 {
 148         struct net_device *dev = NULL;
 149         struct ipv6_mc_socklist *mc_lst;
 150         struct ipv6_pinfo *np = inet6_sk(sk);
 151         struct net *net = sock_net(sk);
 152         int err;
 153
 154         if (!ipv6_addr_is_multicast(addr))
 155                 return -EINVAL;
 156
 157         rcu_read_lock();
 158         for_each_pmc_rcu(np, mc_lst) {
 159                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 160                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 161                         rcu_read_unlock();
 162                         return -EADDRINUSE;
 163                 }
 164         }
 165         rcu_read_unlock();
 166
 167         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 168
 169         if (mc_lst == NULL)
 170                 return -ENOMEM;
 171
 172         mc_lst->next = NULL;
 173         mc_lst->addr = *addr;
 174
 175         rcu_read_lock();
 176         if (ifindex == 0) {
 177                 struct rt6_info *rt;
 178                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 179                 if (rt) {
 180                         dev = rt->dst.dev;
 181                         ip6_rt_put(rt);
 182                 }
 183         } else
 184                 dev = dev_get_by_index_rcu(net, ifindex);
 185
 186         if (dev == NULL) {
 187                 rcu_read_unlock();
 188                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 189                 return -ENODEV;
 190         }
 191
 192         mc_lst->ifindex = dev->ifindex;
 193         mc_lst->sfmode = MCAST_EXCLUDE;
 194         rwlock_init(&mc_lst->sflock);
 195         mc_lst->sflist = NULL;
 196
 197         /*
 198          *      now add/increase the group membership on the device
 199          */
 200
 201         err = ipv6_dev_mc_inc(dev, addr);
 202
 203         if (err) {
 204                 rcu_read_unlock();
 205                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 206                 return err;
 207         }
 208
 209         spin_lock(&ipv6_sk_mc_lock);
 210         mc_lst->next = np->ipv6_mc_list;
 211         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 212         spin_unlock(&ipv6_sk_mc_lock);
 213
 214         rcu_read_unlock();
 215
 216         return 0;
 217 }
 218
 219 /*
 220  *      socket leave on multicast group
 221  */
 222 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 223 {
 224         struct ipv6_pinfo *np = inet6_sk(sk);
 225         struct ipv6_mc_socklist *mc_lst;
 226         struct ipv6_mc_socklist __rcu **lnk;
 227         struct net *net = sock_net(sk);
 228
 229         if (!ipv6_addr_is_multicast(addr))
 230                 return -EINVAL;
 231
 232         spin_lock(&ipv6_sk_mc_lock);
 233         for (lnk = &np->ipv6_mc_list;
 234              (mc_lst = rcu_dereference_protected(*lnk,
 235                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 236               lnk = &mc_lst->next) {
 237                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 238                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 239                         struct net_device *dev;
 240
 241                         *lnk = mc_lst->next;
 242                         spin_unlock(&ipv6_sk_mc_lock);
 243
 244                         rcu_read_lock();
 245                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 246                         if (dev != NULL) {
 247                                 struct inet6_dev *idev = __in6_dev_get(dev);
 248
 249                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 250                                 if (idev)
 251                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 252                         } else
 253                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 254                         rcu_read_unlock();
 255                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 256                         kfree_rcu(mc_lst, rcu);
 257                         return 0;
 258                 }
 259         }
 260         spin_unlock(&ipv6_sk_mc_lock);
 261
 262         return -EADDRNOTAVAIL;
 263 }
 264
 265 /* called with rcu_read_lock() */
 266 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 267                                              const struct in6_addr *group,
 268                                              int ifindex)
 269 {
 270         struct net_device *dev = NULL;
 271         struct inet6_dev *idev = NULL;
 272
 273         if (ifindex == 0) {
 274                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 275
 276                 if (rt) {
 277                         dev = rt->dst.dev;
 278                         ip6_rt_put(rt);
 279                 }
 280         } else
 281                 dev = dev_get_by_index_rcu(net, ifindex);
 282
 283         if (!dev)
 284                 return NULL;
 285         idev = __in6_dev_get(dev);
 286         if (!idev)
 287                 return NULL;
 288         read_lock_bh(&idev->lock);
 289         if (idev->dead) {
 290                 read_unlock_bh(&idev->lock);
 291                 return NULL;
 292         }
 293         return idev;
 294 }
 295
 296 void ipv6_sock_mc_close(struct sock *sk)
 297 {
 298         struct ipv6_pinfo *np = inet6_sk(sk);
 299         struct ipv6_mc_socklist *mc_lst;
 300         struct net *net = sock_net(sk);
 301
 302         if (!rcu_access_pointer(np->ipv6_mc_list))
 303                 return;
 304
 305         spin_lock(&ipv6_sk_mc_lock);
 306         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 307                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 308                 struct net_device *dev;
 309
 310                 np->ipv6_mc_list = mc_lst->next;
 311                 spin_unlock(&ipv6_sk_mc_lock);
 312
 313                 rcu_read_lock();
 314                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 315                 if (dev) {
 316                         struct inet6_dev *idev = __in6_dev_get(dev);
 317
 318                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 319                         if (idev)
 320                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 321                 } else
 322                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 323                 rcu_read_unlock();
 324
 325                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 326                 kfree_rcu(mc_lst, rcu);
 327
 328                 spin_lock(&ipv6_sk_mc_lock);
 329         }
 330         spin_unlock(&ipv6_sk_mc_lock);
 331 }
 332
 333 int ip6_mc_source(int add, int omode, struct sock *sk,
 334         struct group_source_req *pgsr)
 335 {
 336         struct in6_addr *source, *group;
 337         struct ipv6_mc_socklist *pmc;
 338         struct inet6_dev *idev;
 339         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 340         struct ip6_sf_socklist *psl;
 341         struct net *net = sock_net(sk);
 342         int i, j, rv;
 343         int leavegroup = 0;
 344         int pmclocked = 0;
 345         int err;
 346
 347         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 348         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 349
 350         if (!ipv6_addr_is_multicast(group))
 351                 return -EINVAL;
 352
 353         rcu_read_lock();
 354         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 355         if (!idev) {
 356                 rcu_read_unlock();
 357                 return -ENODEV;
 358         }
 359
 360         err = -EADDRNOTAVAIL;
 361
 362         for_each_pmc_rcu(inet6, pmc) {
 363                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 364                         continue;
 365                 if (ipv6_addr_equal(&pmc->addr, group))
 366                         break;
 367         }
 368         if (!pmc) {             /* must have a prior join */
 369                 err = -EINVAL;
 370                 goto done;
 371         }
 372         /* if a source filter was set, must be the same mode as before */
 373         if (pmc->sflist) {
 374                 if (pmc->sfmode != omode) {
 375                         err = -EINVAL;
 376                         goto done;
 377                 }
 378         } else if (pmc->sfmode != omode) {
 379                 /* allow mode switches for empty-set filters */
 380                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 381                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 382                 pmc->sfmode = omode;
 383         }
 384
 385         write_lock(&pmc->sflock);
 386         pmclocked = 1;
 387
 388         psl = pmc->sflist;
 389         if (!add) {
 390                 if (!psl)
 391                         goto done;      /* err = -EADDRNOTAVAIL */
 392                 rv = !0;
 393                 for (i=0; i<psl->sl_count; i++) {
 394                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 395                         if (rv == 0)
 396                                 break;
 397                 }
 398                 if (rv)         /* source not found */
 399                         goto done;      /* err = -EADDRNOTAVAIL */
 400
 401                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 402                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 403                         leavegroup = 1;
 404                         goto done;
 405                 }
 406
 407                 /* update the interface filter */
 408                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 409
 410                 for (j=i+1; j<psl->sl_count; j++)
 411                         psl->sl_addr[j-1] = psl->sl_addr[j];
 412                 psl->sl_count--;
 413                 err = 0;
 414                 goto done;
 415         }
 416         /* else, add a new source to the filter */
 417
 418         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 419                 err = -ENOBUFS;
 420                 goto done;
 421         }
 422         if (!psl || psl->sl_count == psl->sl_max) {
 423                 struct ip6_sf_socklist *newpsl;
 424                 int count = IP6_SFBLOCK;
 425
 426                 if (psl)
 427                         count += psl->sl_max;
 428                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 429                 if (!newpsl) {
 430                         err = -ENOBUFS;
 431                         goto done;
 432                 }
 433                 newpsl->sl_max = count;
 434                 newpsl->sl_count = count - IP6_SFBLOCK;
 435                 if (psl) {
 436                         for (i=0; i<psl->sl_count; i++)
 437                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 438                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 439                 }
 440                 pmc->sflist = psl = newpsl;
 441         }
 442         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 443         for (i=0; i<psl->sl_count; i++) {
 444                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 445                 if (rv == 0) /* There is an error in the address. */
 446                         goto done;
 447         }
 448         for (j=psl->sl_count-1; j>=i; j--)
 449                 psl->sl_addr[j+1] = psl->sl_addr[j];
 450         psl->sl_addr[i] = *source;
 451         psl->sl_count++;
 452         err = 0;
 453         /* update the interface list */
 454         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 455 done:
 456         if (pmclocked)
 457                 write_unlock(&pmc->sflock);
 458         read_unlock_bh(&idev->lock);
 459         rcu_read_unlock();
 460         if (leavegroup)
 461                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 462         return err;
 463 }
 464
 465 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 466 {
 467         const struct in6_addr *group;
 468         struct ipv6_mc_socklist *pmc;
 469         struct inet6_dev *idev;
 470         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 471         struct ip6_sf_socklist *newpsl, *psl;
 472         struct net *net = sock_net(sk);
 473         int leavegroup = 0;
 474         int i, err;
 475
 476         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 477
 478         if (!ipv6_addr_is_multicast(group))
 479                 return -EINVAL;
 480         if (gsf->gf_fmode != MCAST_INCLUDE &&
 481             gsf->gf_fmode != MCAST_EXCLUDE)
 482                 return -EINVAL;
 483
 484         rcu_read_lock();
 485         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 486
 487         if (!idev) {
 488                 rcu_read_unlock();
 489                 return -ENODEV;
 490         }
 491
 492         err = 0;
 493
 494         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 495                 leavegroup = 1;
 496                 goto done;
 497         }
 498
 499         for_each_pmc_rcu(inet6, pmc) {
 500                 if (pmc->ifindex != gsf->gf_interface)
 501                         continue;
 502                 if (ipv6_addr_equal(&pmc->addr, group))
 503                         break;
 504         }
 505         if (!pmc) {             /* must have a prior join */
 506                 err = -EINVAL;
 507                 goto done;
 508         }
 509         if (gsf->gf_numsrc) {
 510                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 511                                                           GFP_ATOMIC);
 512                 if (!newpsl) {
 513                         err = -ENOBUFS;
 514                         goto done;
 515                 }
 516                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 517                 for (i=0; i<newpsl->sl_count; ++i) {
 518                         struct sockaddr_in6 *psin6;
 519
 520                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 521                         newpsl->sl_addr[i] = psin6->sin6_addr;
 522                 }
 523                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 524                         newpsl->sl_count, newpsl->sl_addr, 0);
 525                 if (err) {
 526                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 527                         goto done;
 528                 }
 529         } else {
 530                 newpsl = NULL;
 531                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 532         }
 533
 534         write_lock(&pmc->sflock);
 535         psl = pmc->sflist;
 536         if (psl) {
 537                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 538                         psl->sl_count, psl->sl_addr, 0);
 539                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 540         } else
 541                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 542         pmc->sflist = newpsl;
 543         pmc->sfmode = gsf->gf_fmode;
 544         write_unlock(&pmc->sflock);
 545         err = 0;
 546 done:
 547         read_unlock_bh(&idev->lock);
 548         rcu_read_unlock();
 549         if (leavegroup)
 550                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 551         return err;
 552 }
 553
 554 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 555         struct group_filter __user *optval, int __user *optlen)
 556 {
 557         int err, i, count, copycount;
 558         const struct in6_addr *group;
 559         struct ipv6_mc_socklist *pmc;
 560         struct inet6_dev *idev;
 561         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 562         struct ip6_sf_socklist *psl;
 563         struct net *net = sock_net(sk);
 564
 565         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 566
 567         if (!ipv6_addr_is_multicast(group))
 568                 return -EINVAL;
 569
 570         rcu_read_lock();
 571         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 572
 573         if (!idev) {
 574                 rcu_read_unlock();
 575                 return -ENODEV;
 576         }
 577
 578         err = -EADDRNOTAVAIL;
 579         /*
 580          * changes to the ipv6_mc_list require the socket lock and
 581          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 582          * so reading the list is safe.
 583          */
 584
 585         for_each_pmc_rcu(inet6, pmc) {
 586                 if (pmc->ifindex != gsf->gf_interface)
 587                         continue;
 588                 if (ipv6_addr_equal(group, &pmc->addr))
 589                         break;
 590         }
 591         if (!pmc)               /* must have a prior join */
 592                 goto done;
 593         gsf->gf_fmode = pmc->sfmode;
 594         psl = pmc->sflist;
 595         count = psl ? psl->sl_count : 0;
 596         read_unlock_bh(&idev->lock);
 597         rcu_read_unlock();
 598
 599         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 600         gsf->gf_numsrc = count;
 601         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 602             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 603                 return -EFAULT;
 604         }
 605         /* changes to psl require the socket lock, a read lock on
 606          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 607          * have the socket lock, so reading here is safe.
 608          */
 609         for (i=0; i<copycount; i++) {
 610                 struct sockaddr_in6 *psin6;
 611                 struct sockaddr_storage ss;
 612
 613                 psin6 = (struct sockaddr_in6 *)&ss;
 614                 memset(&ss, 0, sizeof(ss));
 615                 psin6->sin6_family = AF_INET6;
 616                 psin6->sin6_addr = psl->sl_addr[i];
 617                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 618                         return -EFAULT;
 619         }
 620         return 0;
 621 done:
 622         read_unlock_bh(&idev->lock);
 623         rcu_read_unlock();
 624         return err;
 625 }
 626
 627 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 628                     const struct in6_addr *src_addr)
 629 {
 630         struct ipv6_pinfo *np = inet6_sk(sk);
 631         struct ipv6_mc_socklist *mc;
 632         struct ip6_sf_socklist *psl;
 633         bool rv = true;
 634
 635         rcu_read_lock();
 636         for_each_pmc_rcu(np, mc) {
 637                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 638                         break;
 639         }
 640         if (!mc) {
 641                 rcu_read_unlock();
 642                 return true;
 643         }
 644         read_lock(&mc->sflock);
 645         psl = mc->sflist;
 646         if (!psl) {
 647                 rv = mc->sfmode == MCAST_EXCLUDE;
 648         } else {
 649                 int i;
 650
 651                 for (i=0; i<psl->sl_count; i++) {
 652                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 653                                 break;
 654                 }
 655                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 656                         rv = false;
 657                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 658                         rv = false;
 659         }
 660         read_unlock(&mc->sflock);
 661         rcu_read_unlock();
 662
 663         return rv;
 664 }
 665
 666 static void ma_put(struct ifmcaddr6 *mc)
 667 {
 668         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 669                 in6_dev_put(mc->idev);
 670                 kfree(mc);
 671         }
 672 }
 673
 674 static void igmp6_group_added(struct ifmcaddr6 *mc)
 675 {
 676         struct net_device *dev = mc->idev->dev;
 677         char buf[MAX_ADDR_LEN];
 678
 679         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 680             IPV6_ADDR_SCOPE_LINKLOCAL)
 681                 return;
 682
 683         spin_lock_bh(&mc->mca_lock);
 684         if (!(mc->mca_flags&MAF_LOADED)) {
 685                 mc->mca_flags |= MAF_LOADED;
 686                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 687                         dev_mc_add(dev, buf);
 688         }
 689         spin_unlock_bh(&mc->mca_lock);
 690
 691         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 692                 return;
 693
 694         if (mld_in_v1_mode(mc->idev)) {
 695                 igmp6_join_group(mc);
 696                 return;
 697         }
 698         /* else v2 */
 699
 700         mc->mca_crcount = mc->idev->mc_qrv;
 701         mld_ifc_event(mc->idev);
 702 }
 703
 704 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 705 {
 706         struct net_device *dev = mc->idev->dev;
 707         char buf[MAX_ADDR_LEN];
 708
 709         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 710             IPV6_ADDR_SCOPE_LINKLOCAL)
 711                 return;
 712
 713         spin_lock_bh(&mc->mca_lock);
 714         if (mc->mca_flags&MAF_LOADED) {
 715                 mc->mca_flags &= ~MAF_LOADED;
 716                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 717                         dev_mc_del(dev, buf);
 718         }
 719
 720         if (mc->mca_flags & MAF_NOREPORT)
 721                 goto done;
 722         spin_unlock_bh(&mc->mca_lock);
 723
 724         if (!mc->idev->dead)
 725                 igmp6_leave_group(mc);
 726
 727         spin_lock_bh(&mc->mca_lock);
 728         if (del_timer(&mc->mca_timer))
 729                 atomic_dec(&mc->mca_refcnt);
 730 done:
 731         ip6_mc_clear_src(mc);
 732         spin_unlock_bh(&mc->mca_lock);
 733 }
 734
 735 /*
 736  * deleted ifmcaddr6 manipulation
 737  */
 738 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 739 {
 740         struct ifmcaddr6 *pmc;
 741
 742         /* this is an "ifmcaddr6" for convenience; only the fields below
 743          * are actually used. In particular, the refcnt and users are not
 744          * used for management of the delete list. Using the same structure
 745          * for deleted items allows change reports to use common code with
 746          * non-deleted or query-response MCA's.
 747          */
 748         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 749         if (!pmc)
 750                 return;
 751
 752         spin_lock_bh(&im->mca_lock);
 753         spin_lock_init(&pmc->mca_lock);
 754         pmc->idev = im->idev;
 755         in6_dev_hold(idev);
 756         pmc->mca_addr = im->mca_addr;
 757         pmc->mca_crcount = idev->mc_qrv;
 758         pmc->mca_sfmode = im->mca_sfmode;
 759         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 760                 struct ip6_sf_list *psf;
 761
 762                 pmc->mca_tomb = im->mca_tomb;
 763                 pmc->mca_sources = im->mca_sources;
 764                 im->mca_tomb = im->mca_sources = NULL;
 765                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 766                         psf->sf_crcount = pmc->mca_crcount;
 767         }
 768         spin_unlock_bh(&im->mca_lock);
 769
 770         spin_lock_bh(&idev->mc_lock);
 771         pmc->next = idev->mc_tomb;
 772         idev->mc_tomb = pmc;
 773         spin_unlock_bh(&idev->mc_lock);
 774 }
 775
 776 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 777 {
 778         struct ifmcaddr6 *pmc, *pmc_prev;
 779         struct ip6_sf_list *psf, *psf_next;
 780
 781         spin_lock_bh(&idev->mc_lock);
 782         pmc_prev = NULL;
 783         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 784                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 785                         break;
 786                 pmc_prev = pmc;
 787         }
 788         if (pmc) {
 789                 if (pmc_prev)
 790                         pmc_prev->next = pmc->next;
 791                 else
 792                         idev->mc_tomb = pmc->next;
 793         }
 794         spin_unlock_bh(&idev->mc_lock);
 795
 796         if (pmc) {
 797                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 798                         psf_next = psf->sf_next;
 799                         kfree(psf);
 800                 }
 801                 in6_dev_put(pmc->idev);
 802                 kfree(pmc);
 803         }
 804 }
 805
 806 static void mld_clear_delrec(struct inet6_dev *idev)
 807 {
 808         struct ifmcaddr6 *pmc, *nextpmc;
 809
 810         spin_lock_bh(&idev->mc_lock);
 811         pmc = idev->mc_tomb;
 812         idev->mc_tomb = NULL;
 813         spin_unlock_bh(&idev->mc_lock);
 814
 815         for (; pmc; pmc = nextpmc) {
 816                 nextpmc = pmc->next;
 817                 ip6_mc_clear_src(pmc);
 818                 in6_dev_put(pmc->idev);
 819                 kfree(pmc);
 820         }
 821
 822         /* clear dead sources, too */
 823         read_lock_bh(&idev->lock);
 824         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 825                 struct ip6_sf_list *psf, *psf_next;
 826
 827                 spin_lock_bh(&pmc->mca_lock);
 828                 psf = pmc->mca_tomb;
 829                 pmc->mca_tomb = NULL;
 830                 spin_unlock_bh(&pmc->mca_lock);
 831                 for (; psf; psf=psf_next) {
 832                         psf_next = psf->sf_next;
 833                         kfree(psf);
 834                 }
 835         }
 836         read_unlock_bh(&idev->lock);
 837 }
 838
 839
 840 /*
 841  *      device multicast group inc (add if not found)
 842  */
 843 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 844 {
 845         struct ifmcaddr6 *mc;
 846         struct inet6_dev *idev;
 847
 848         /* we need to take a reference on idev */
 849         idev = in6_dev_get(dev);
 850
 851         if (idev == NULL)
 852                 return -EINVAL;
 853
 854         write_lock_bh(&idev->lock);
 855         if (idev->dead) {
 856                 write_unlock_bh(&idev->lock);
 857                 in6_dev_put(idev);
 858                 return -ENODEV;
 859         }
 860
 861         for (mc = idev->mc_list; mc; mc = mc->next) {
 862                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 863                         mc->mca_users++;
 864                         write_unlock_bh(&idev->lock);
 865                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 866                                 NULL, 0);
 867                         in6_dev_put(idev);
 868                         return 0;
 869                 }
 870         }
 871
 872         /*
 873          *      not found: create a new one.
 874          */
 875
 876         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 877
 878         if (mc == NULL) {
 879                 write_unlock_bh(&idev->lock);
 880                 in6_dev_put(idev);
 881                 return -ENOMEM;
 882         }
 883
 884         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 885
 886         mc->mca_addr = *addr;
 887         mc->idev = idev; /* (reference taken) */
 888         mc->mca_users = 1;
 889         /* mca_stamp should be updated upon changes */
 890         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 891         atomic_set(&mc->mca_refcnt, 2);
 892         spin_lock_init(&mc->mca_lock);
 893
 894         /* initial mode is (EX, empty) */
 895         mc->mca_sfmode = MCAST_EXCLUDE;
 896         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 897
 898         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 899             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 900                 mc->mca_flags |= MAF_NOREPORT;
 901
 902         mc->next = idev->mc_list;
 903         idev->mc_list = mc;
 904         write_unlock_bh(&idev->lock);
 905
 906         mld_del_delrec(idev, &mc->mca_addr);
 907         igmp6_group_added(mc);
 908         ma_put(mc);
 909         return 0;
 910 }
 911
 912 /*
 913  *      device multicast group del
 914  */
 915 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 916 {
 917         struct ifmcaddr6 *ma, **map;
 918
 919         write_lock_bh(&idev->lock);
 920         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 921                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 922                         if (--ma->mca_users == 0) {
 923                                 *map = ma->next;
 924                                 write_unlock_bh(&idev->lock);
 925
 926                                 igmp6_group_dropped(ma);
 927
 928                                 ma_put(ma);
 929                                 return 0;
 930                         }
 931                         write_unlock_bh(&idev->lock);
 932                         return 0;
 933                 }
 934         }
 935         write_unlock_bh(&idev->lock);
 936
 937         return -ENOENT;
 938 }
 939
 940 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 941 {
 942         struct inet6_dev *idev;
 943         int err;
 944
 945         rcu_read_lock();
 946
 947         idev = __in6_dev_get(dev);
 948         if (!idev)
 949                 err = -ENODEV;
 950         else
 951                 err = __ipv6_dev_mc_dec(idev, addr);
 952
 953         rcu_read_unlock();
 954         return err;
 955 }
 956
 957 /*
 958  *      check if the interface/address pair is valid
 959  */
 960 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 961                          const struct in6_addr *src_addr)
 962 {
 963         struct inet6_dev *idev;
 964         struct ifmcaddr6 *mc;
 965         bool rv = false;
 966
 967         rcu_read_lock();
 968         idev = __in6_dev_get(dev);
 969         if (idev) {
 970                 read_lock_bh(&idev->lock);
 971                 for (mc = idev->mc_list; mc; mc=mc->next) {
 972                         if (ipv6_addr_equal(&mc->mca_addr, group))
 973                                 break;
 974                 }
 975                 if (mc) {
 976                         if (src_addr && !ipv6_addr_any(src_addr)) {
 977                                 struct ip6_sf_list *psf;
 978
 979                                 spin_lock_bh(&mc->mca_lock);
 980                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 981                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 982                                                 break;
 983                                 }
 984                                 if (psf)
 985                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 986                                                 psf->sf_count[MCAST_EXCLUDE] !=
 987                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 988                                 else
 989                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 990                                 spin_unlock_bh(&mc->mca_lock);
 991                         } else
 992                                 rv = true; /* don't filter unspecified source */
 993                 }
 994                 read_unlock_bh(&idev->lock);
 995         }
 996         rcu_read_unlock();
 997         return rv;
 998 }
 999
1000 static void mld_gq_start_timer(struct inet6_dev *idev)
1001 {
1002         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1003
1004         idev->mc_gq_running = 1;
1005         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1006                 in6_dev_hold(idev);
1007 }
1008
1009 static void mld_gq_stop_timer(struct inet6_dev *idev)
1010 {
1011         idev->mc_gq_running = 0;
1012         if (del_timer(&idev->mc_gq_timer))
1013                 __in6_dev_put(idev);
1014 }
1015
1016 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1017 {
1018         unsigned long tv = prandom_u32() % delay;
1019
1020         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1021                 in6_dev_hold(idev);
1022 }
1023
1024 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1025 {
1026         idev->mc_ifc_count = 0;
1027         if (del_timer(&idev->mc_ifc_timer))
1028                 __in6_dev_put(idev);
1029 }
1030
1031 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1032 {
1033         unsigned long tv = prandom_u32() % delay;
1034
1035         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1036                 in6_dev_hold(idev);
1037 }
1038
1039 static void mld_dad_stop_timer(struct inet6_dev *idev)
1040 {
1041         if (del_timer(&idev->mc_dad_timer))
1042                 __in6_dev_put(idev);
1043 }
1044
1045 /*
1046  *      IGMP handling (alias multicast ICMPv6 messages)
1047  */
1048
1049 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1050 {
1051         unsigned long delay = resptime;
1052
1053         /* Do not start timer for these addresses */
1054         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1055             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1056                 return;
1057
1058         if (del_timer(&ma->mca_timer)) {
1059                 atomic_dec(&ma->mca_refcnt);
1060                 delay = ma->mca_timer.expires - jiffies;
1061         }
1062
1063         if (delay >= resptime)
1064                 delay = prandom_u32() % resptime;
1065
1066         ma->mca_timer.expires = jiffies + delay;
1067         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1068                 atomic_inc(&ma->mca_refcnt);
1069         ma->mca_flags |= MAF_TIMER_RUNNING;
1070 }
1071
1072 /* mark EXCLUDE-mode sources */
1073 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1074                              const struct in6_addr *srcs)
1075 {
1076         struct ip6_sf_list *psf;
1077         int i, scount;
1078
1079         scount = 0;
1080         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1081                 if (scount == nsrcs)
1082                         break;
1083                 for (i=0; i<nsrcs; i++) {
1084                         /* skip inactive filters */
1085                         if (psf->sf_count[MCAST_INCLUDE] ||
1086                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1087                             psf->sf_count[MCAST_EXCLUDE])
1088                                 break;
1089                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1090                                 scount++;
1091                                 break;
1092                         }
1093                 }
1094         }
1095         pmc->mca_flags &= ~MAF_GSQUERY;
1096         if (scount == nsrcs)    /* all sources excluded */
1097                 return false;
1098         return true;
1099 }
1100
1101 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1102                             const struct in6_addr *srcs)
1103 {
1104         struct ip6_sf_list *psf;
1105         int i, scount;
1106
1107         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1108                 return mld_xmarksources(pmc, nsrcs, srcs);
1109
1110         /* mark INCLUDE-mode sources */
1111
1112         scount = 0;
1113         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1114                 if (scount == nsrcs)
1115                         break;
1116                 for (i=0; i<nsrcs; i++) {
1117                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1118                                 psf->sf_gsresp = 1;
1119                                 scount++;
1120                                 break;
1121                         }
1122                 }
1123         }
1124         if (!scount) {
1125                 pmc->mca_flags &= ~MAF_GSQUERY;
1126                 return false;
1127         }
1128         pmc->mca_flags |= MAF_GSQUERY;
1129         return true;
1130 }
1131
1132 static int mld_force_mld_version(const struct inet6_dev *idev)
1133 {
1134         /* Normally, both are 0 here. If enforcement to a particular is
1135          * being used, individual device enforcement will have a lower
1136          * precedence over 'all' device (.../conf/all/force_mld_version).
1137          */
1138
1139         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1140                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1141         else
1142                 return idev->cnf.force_mld_version;
1143 }
1144
1145 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1146 {
1147         return mld_force_mld_version(idev) == 2;
1148 }
1149
1150 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1151 {
1152         return mld_force_mld_version(idev) == 1;
1153 }
1154
1155 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1156 {
1157         if (mld_in_v2_mode_only(idev))
1158                 return false;
1159         if (mld_in_v1_mode_only(idev))
1160                 return true;
1161         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1162                 return true;
1163
1164         return false;
1165 }
1166
1167 static void mld_set_v1_mode(struct inet6_dev *idev)
1168 {
1169         /* RFC3810, relevant sections:
1170          *  - 9.1. Robustness Variable
1171          *  - 9.2. Query Interval
1172          *  - 9.3. Query Response Interval
1173          *  - 9.12. Older Version Querier Present Timeout
1174          */
1175         unsigned long switchback;
1176
1177         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1178
1179         idev->mc_v1_seen = jiffies + switchback;
1180 }
1181
1182 static void mld_update_qrv(struct inet6_dev *idev,
1183                            const struct mld2_query *mlh2)
1184 {
1185         /* RFC3810, relevant sections:
1186          *  - 5.1.8. QRV (Querier's Robustness Variable)
1187          *  - 9.1. Robustness Variable
1188          */
1189
1190         /* The value of the Robustness Variable MUST NOT be zero,
1191          * and SHOULD NOT be one. Catch this here if we ever run
1192          * into such a case in future.
1193          */
1194         WARN_ON(idev->mc_qrv == 0);
1195
1196         if (mlh2->mld2q_qrv > 0)
1197                 idev->mc_qrv = mlh2->mld2q_qrv;
1198
1199         if (unlikely(idev->mc_qrv < 2)) {
1200                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1201                                      idev->mc_qrv, MLD_QRV_DEFAULT);
1202                 idev->mc_qrv = MLD_QRV_DEFAULT;
1203         }
1204 }
1205
1206 static void mld_update_qi(struct inet6_dev *idev,
1207                           const struct mld2_query *mlh2)
1208 {
1209         /* RFC3810, relevant sections:
1210          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1211          *  - 9.2. Query Interval
1212          *  - 9.12. Older Version Querier Present Timeout
1213          *    (the [Query Interval] in the last Query received)
1214          */
1215         unsigned long mc_qqi;
1216
1217         if (mlh2->mld2q_qqic < 128) {
1218                 mc_qqi = mlh2->mld2q_qqic;
1219         } else {
1220                 unsigned long mc_man, mc_exp;
1221
1222                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1223                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1224
1225                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1226         }
1227
1228         idev->mc_qi = mc_qqi * HZ;
1229 }
1230
1231 static void mld_update_qri(struct inet6_dev *idev,
1232                            const struct mld2_query *mlh2)
1233 {
1234         /* RFC3810, relevant sections:
1235          *  - 5.1.3. Maximum Response Code
1236          *  - 9.3. Query Response Interval
1237          */
1238         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1239 }
1240
1241 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1242                           unsigned long *max_delay)
1243 {
1244         unsigned long mldv1_md;
1245
1246         /* Ignore v1 queries */
1247         if (mld_in_v2_mode_only(idev))
1248                 return -EINVAL;
1249
1250         /* MLDv1 router present */
1251         mldv1_md = ntohs(mld->mld_maxdelay);
1252         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1253
1254         mld_set_v1_mode(idev);
1255
1256         /* cancel MLDv2 report timer */
1257         mld_gq_stop_timer(idev);
1258         /* cancel the interface change timer */
1259         mld_ifc_stop_timer(idev);
1260         /* clear deleted report items */
1261         mld_clear_delrec(idev);
1262
1263         return 0;
1264 }
1265
1266 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1267                           unsigned long *max_delay)
1268 {
1269         /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1270         if (mld_in_v1_mode(idev))
1271                 return -EINVAL;
1272
1273         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1274
1275         mld_update_qrv(idev, mld);
1276         mld_update_qi(idev, mld);
1277         mld_update_qri(idev, mld);
1278
1279         idev->mc_maxdelay = *max_delay;
1280
1281         return 0;
1282 }
1283
1284 /* called with rcu_read_lock() */
1285 int igmp6_event_query(struct sk_buff *skb)
1286 {
1287         struct mld2_query *mlh2 = NULL;
1288         struct ifmcaddr6 *ma;
1289         const struct in6_addr *group;
1290         unsigned long max_delay;
1291         struct inet6_dev *idev;
1292         struct mld_msg *mld;
1293         int group_type;
1294         int mark = 0;
1295         int len, err;
1296
1297         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1298                 return -EINVAL;
1299
1300         /* compute payload length excluding extension headers */
1301         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1302         len -= skb_network_header_len(skb);
1303
1304         /* Drop queries with not link local source */
1305         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1306                 return -EINVAL;
1307
1308         idev = __in6_dev_get(skb->dev);
1309         if (idev == NULL)
1310                 return 0;
1311
1312         mld = (struct mld_msg *)icmp6_hdr(skb);
1313         group = &mld->mld_mca;
1314         group_type = ipv6_addr_type(group);
1315
1316         if (group_type != IPV6_ADDR_ANY &&
1317             !(group_type&IPV6_ADDR_MULTICAST))
1318                 return -EINVAL;
1319
1320         if (len == MLD_V1_QUERY_LEN) {
1321                 err = mld_process_v1(idev, mld, &max_delay);
1322                 if (err < 0)
1323                         return err;
1324         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1325                 int srcs_offset = sizeof(struct mld2_query) -
1326                                   sizeof(struct icmp6hdr);
1327
1328                 if (!pskb_may_pull(skb, srcs_offset))
1329                         return -EINVAL;
1330
1331                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1332
1333                 err = mld_process_v2(idev, mlh2, &max_delay);
1334                 if (err < 0)
1335                         return err;
1336
1337                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1338                         if (mlh2->mld2q_nsrcs)
1339                                 return -EINVAL; /* no sources allowed */
1340
1341                         mld_gq_start_timer(idev);
1342                         return 0;
1343                 }
1344                 /* mark sources to include, if group & source-specific */
1345                 if (mlh2->mld2q_nsrcs != 0) {
1346                         if (!pskb_may_pull(skb, srcs_offset +
1347                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1348                                 return -EINVAL;
1349
1350                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1351                         mark = 1;
1352                 }
1353         } else
1354                 return -EINVAL;
1355
1356         read_lock_bh(&idev->lock);
1357         if (group_type == IPV6_ADDR_ANY) {
1358                 for (ma = idev->mc_list; ma; ma=ma->next) {
1359                         spin_lock_bh(&ma->mca_lock);
1360                         igmp6_group_queried(ma, max_delay);
1361                         spin_unlock_bh(&ma->mca_lock);
1362                 }
1363         } else {
1364                 for (ma = idev->mc_list; ma; ma=ma->next) {
1365                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1366                                 continue;
1367                         spin_lock_bh(&ma->mca_lock);
1368                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1369                                 /* gsquery <- gsquery && mark */
1370                                 if (!mark)
1371                                         ma->mca_flags &= ~MAF_GSQUERY;
1372                         } else {
1373                                 /* gsquery <- mark */
1374                                 if (mark)
1375                                         ma->mca_flags |= MAF_GSQUERY;
1376                                 else
1377                                         ma->mca_flags &= ~MAF_GSQUERY;
1378                         }
1379                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1380                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1381                                 igmp6_group_queried(ma, max_delay);
1382                         spin_unlock_bh(&ma->mca_lock);
1383                         break;
1384                 }
1385         }
1386         read_unlock_bh(&idev->lock);
1387
1388         return 0;
1389 }
1390
1391 /* called with rcu_read_lock() */
1392 int igmp6_event_report(struct sk_buff *skb)
1393 {
1394         struct ifmcaddr6 *ma;
1395         struct inet6_dev *idev;
1396         struct mld_msg *mld;
1397         int addr_type;
1398
1399         /* Our own report looped back. Ignore it. */
1400         if (skb->pkt_type == PACKET_LOOPBACK)
1401                 return 0;
1402
1403         /* send our report if the MC router may not have heard this report */
1404         if (skb->pkt_type != PACKET_MULTICAST &&
1405             skb->pkt_type != PACKET_BROADCAST)
1406                 return 0;
1407
1408         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1409                 return -EINVAL;
1410
1411         mld = (struct mld_msg *)icmp6_hdr(skb);
1412
1413         /* Drop reports with not link local source */
1414         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1415         if (addr_type != IPV6_ADDR_ANY &&
1416             !(addr_type&IPV6_ADDR_LINKLOCAL))
1417                 return -EINVAL;
1418
1419         idev = __in6_dev_get(skb->dev);
1420         if (idev == NULL)
1421                 return -ENODEV;
1422
1423         /*
1424          *      Cancel the timer for this group
1425          */
1426
1427         read_lock_bh(&idev->lock);
1428         for (ma = idev->mc_list; ma; ma=ma->next) {
1429                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1430                         spin_lock(&ma->mca_lock);
1431                         if (del_timer(&ma->mca_timer))
1432                                 atomic_dec(&ma->mca_refcnt);
1433                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1434                         spin_unlock(&ma->mca_lock);
1435                         break;
1436                 }
1437         }
1438         read_unlock_bh(&idev->lock);
1439         return 0;
1440 }
1441
1442 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1443                   int gdeleted, int sdeleted)
1444 {
1445         switch (type) {
1446         case MLD2_MODE_IS_INCLUDE:
1447         case MLD2_MODE_IS_EXCLUDE:
1448                 if (gdeleted || sdeleted)
1449                         return false;
1450                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1451                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1452                                 return true;
1453                         /* don't include if this source is excluded
1454                          * in all filters
1455                          */
1456                         if (psf->sf_count[MCAST_INCLUDE])
1457                                 return type == MLD2_MODE_IS_INCLUDE;
1458                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1459                                 psf->sf_count[MCAST_EXCLUDE];
1460                 }
1461                 return false;
1462         case MLD2_CHANGE_TO_INCLUDE:
1463                 if (gdeleted || sdeleted)
1464                         return false;
1465                 return psf->sf_count[MCAST_INCLUDE] != 0;
1466         case MLD2_CHANGE_TO_EXCLUDE:
1467                 if (gdeleted || sdeleted)
1468                         return false;
1469                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1470                     psf->sf_count[MCAST_INCLUDE])
1471                         return false;
1472                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1473                         psf->sf_count[MCAST_EXCLUDE];
1474         case MLD2_ALLOW_NEW_SOURCES:
1475                 if (gdeleted || !psf->sf_crcount)
1476                         return false;
1477                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1478         case MLD2_BLOCK_OLD_SOURCES:
1479                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1480                         return gdeleted || (psf->sf_crcount && sdeleted);
1481                 return psf->sf_crcount && !gdeleted && !sdeleted;
1482         }
1483         return false;
1484 }
1485
1486 static int
1487 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1488 {
1489         struct ip6_sf_list *psf;
1490         int scount = 0;
1491
1492         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1493                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1494                         continue;
1495                 scount++;
1496         }
1497         return scount;
1498 }
1499
1500 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1501                        struct net_device *dev,
1502                        const struct in6_addr *saddr,
1503                        const struct in6_addr *daddr,
1504                        int proto, int len)
1505 {
1506         struct ipv6hdr *hdr;
1507
1508         skb->protocol = htons(ETH_P_IPV6);
1509         skb->dev = dev;
1510
1511         skb_reset_network_header(skb);
1512         skb_put(skb, sizeof(struct ipv6hdr));
1513         hdr = ipv6_hdr(skb);
1514
1515         ip6_flow_hdr(hdr, 0, 0);
1516
1517         hdr->payload_len = htons(len);
1518         hdr->nexthdr = proto;
1519         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1520
1521         hdr->saddr = *saddr;
1522         hdr->daddr = *daddr;
1523 }
1524
1525 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1526 {
1527         struct net_device *dev = idev->dev;
1528         struct net *net = dev_net(dev);
1529         struct sock *sk = net->ipv6.igmp_sk;
1530         struct sk_buff *skb;
1531         struct mld2_report *pmr;
1532         struct in6_addr addr_buf;
1533         const struct in6_addr *saddr;
1534         int hlen = LL_RESERVED_SPACE(dev);
1535         int tlen = dev->needed_tailroom;
1536         int err;
1537         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1538                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1539                      IPV6_TLV_PADN, 0 };
1540
1541         /* we assume size > sizeof(ra) here */
1542         size += hlen + tlen;
1543         /* limit our allocations to order-0 page */
1544         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1545         skb = sock_alloc_send_skb(sk, size, 1, &err);
1546
1547         if (!skb)
1548                 return NULL;
1549
1550         skb->priority = TC_PRIO_CONTROL;
1551         skb_reserve(skb, hlen);
1552
1553         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1554                 /* <draft-ietf-magma-mld-source-05.txt>:
1555                  * use unspecified address as the source address
1556                  * when a valid link-local address is not available.
1557                  */
1558                 saddr = &in6addr_any;
1559         } else
1560                 saddr = &addr_buf;
1561
1562         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1563
1564         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1565
1566         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1567         skb_put(skb, sizeof(*pmr));
1568         pmr = (struct mld2_report *)skb_transport_header(skb);
1569         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1570         pmr->mld2r_resv1 = 0;
1571         pmr->mld2r_cksum = 0;
1572         pmr->mld2r_resv2 = 0;
1573         pmr->mld2r_ngrec = 0;
1574         return skb;
1575 }
1576
1577 static void mld_sendpack(struct sk_buff *skb)
1578 {
1579         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1580         struct mld2_report *pmr =
1581                               (struct mld2_report *)skb_transport_header(skb);
1582         int payload_len, mldlen;
1583         struct inet6_dev *idev;
1584         struct net *net = dev_net(skb->dev);
1585         int err;
1586         struct flowi6 fl6;
1587         struct dst_entry *dst;
1588
1589         rcu_read_lock();
1590         idev = __in6_dev_get(skb->dev);
1591         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1592
1593         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1594                 sizeof(*pip6);
1595         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1596         pip6->payload_len = htons(payload_len);
1597
1598         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1599                                            IPPROTO_ICMPV6,
1600                                            csum_partial(skb_transport_header(skb),
1601                                                         mldlen, 0));
1602
1603         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1604                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1605                          skb->dev->ifindex);
1606         dst = icmp6_dst_alloc(skb->dev, &fl6);
1607
1608         err = 0;
1609         if (IS_ERR(dst)) {
1610                 err = PTR_ERR(dst);
1611                 dst = NULL;
1612         }
1613         skb_dst_set(skb, dst);
1614         if (err)
1615                 goto err_out;
1616
1617         payload_len = skb->len;
1618
1619         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1620                       dst_output);
1621 out:
1622         if (!err) {
1623                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1624                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1625                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1626         } else {
1627                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1628         }
1629
1630         rcu_read_unlock();
1631         return;
1632
1633 err_out:
1634         kfree_skb(skb);
1635         goto out;
1636 }
1637
1638 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1639 {
1640         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1641 }
1642
1643 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1644         int type, struct mld2_grec **ppgr)
1645 {
1646         struct net_device *dev = pmc->idev->dev;
1647         struct mld2_report *pmr;
1648         struct mld2_grec *pgr;
1649
1650         if (!skb)
1651                 skb = mld_newpack(pmc->idev, dev->mtu);
1652         if (!skb)
1653                 return NULL;
1654         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1655         pgr->grec_type = type;
1656         pgr->grec_auxwords = 0;
1657         pgr->grec_nsrcs = 0;
1658         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1659         pmr = (struct mld2_report *)skb_transport_header(skb);
1660         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1661         *ppgr = pgr;
1662         return skb;
1663 }
1664
1665 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1666         skb_tailroom(skb)) : 0)
1667
1668 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1669         int type, int gdeleted, int sdeleted, int crsend)
1670 {
1671         struct inet6_dev *idev = pmc->idev;
1672         struct net_device *dev = idev->dev;
1673         struct mld2_report *pmr;
1674         struct mld2_grec *pgr = NULL;
1675         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1676         int scount, stotal, first, isquery, truncate;
1677
1678         if (pmc->mca_flags & MAF_NOREPORT)
1679                 return skb;
1680
1681         isquery = type == MLD2_MODE_IS_INCLUDE ||
1682                   type == MLD2_MODE_IS_EXCLUDE;
1683         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1684                     type == MLD2_CHANGE_TO_EXCLUDE;
1685
1686         stotal = scount = 0;
1687
1688         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1689
1690         if (!*psf_list)
1691                 goto empty_source;
1692
1693         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1694
1695         /* EX and TO_EX get a fresh packet, if needed */
1696         if (truncate) {
1697                 if (pmr && pmr->mld2r_ngrec &&
1698                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1699                         if (skb)
1700                                 mld_sendpack(skb);
1701                         skb = mld_newpack(idev, dev->mtu);
1702                 }
1703         }
1704         first = 1;
1705         psf_prev = NULL;
1706         for (psf=*psf_list; psf; psf=psf_next) {
1707                 struct in6_addr *psrc;
1708
1709                 psf_next = psf->sf_next;
1710
1711                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1712                         psf_prev = psf;
1713                         continue;
1714                 }
1715
1716                 /* clear marks on query responses */
1717                 if (isquery)
1718                         psf->sf_gsresp = 0;
1719
1720                 if (AVAILABLE(skb) < sizeof(*psrc) +
1721                     first*sizeof(struct mld2_grec)) {
1722                         if (truncate && !first)
1723                                 break;   /* truncate these */
1724                         if (pgr)
1725                                 pgr->grec_nsrcs = htons(scount);
1726                         if (skb)
1727                                 mld_sendpack(skb);
1728                         skb = mld_newpack(idev, dev->mtu);
1729                         first = 1;
1730                         scount = 0;
1731                 }
1732                 if (first) {
1733                         skb = add_grhead(skb, pmc, type, &pgr);
1734                         first = 0;
1735                 }
1736                 if (!skb)
1737                         return NULL;
1738                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1739                 *psrc = psf->sf_addr;
1740                 scount++; stotal++;
1741                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1742                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1743                         psf->sf_crcount--;
1744                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1745                                 if (psf_prev)
1746                                         psf_prev->sf_next = psf->sf_next;
1747                                 else
1748                                         *psf_list = psf->sf_next;
1749                                 kfree(psf);
1750                                 continue;
1751                         }
1752                 }
1753                 psf_prev = psf;
1754         }
1755
1756 empty_source:
1757         if (!stotal) {
1758                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1759                     type == MLD2_BLOCK_OLD_SOURCES)
1760                         return skb;
1761                 if (pmc->mca_crcount || isquery || crsend) {
1762                         /* make sure we have room for group header */
1763                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1764                                 mld_sendpack(skb);
1765                                 skb = NULL; /* add_grhead will get a new one */
1766                         }
1767                         skb = add_grhead(skb, pmc, type, &pgr);
1768                 }
1769         }
1770         if (pgr)
1771                 pgr->grec_nsrcs = htons(scount);
1772
1773         if (isquery)
1774                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1775         return skb;
1776 }
1777
1778 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1779 {
1780         struct sk_buff *skb = NULL;
1781         int type;
1782
1783         read_lock_bh(&idev->lock);
1784         if (!pmc) {
1785                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1786                         if (pmc->mca_flags & MAF_NOREPORT)
1787                                 continue;
1788                         spin_lock_bh(&pmc->mca_lock);
1789                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1790                                 type = MLD2_MODE_IS_EXCLUDE;
1791                         else
1792                                 type = MLD2_MODE_IS_INCLUDE;
1793                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1794                         spin_unlock_bh(&pmc->mca_lock);
1795                 }
1796         } else {
1797                 spin_lock_bh(&pmc->mca_lock);
1798                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1799                         type = MLD2_MODE_IS_EXCLUDE;
1800                 else
1801                         type = MLD2_MODE_IS_INCLUDE;
1802                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1803                 spin_unlock_bh(&pmc->mca_lock);
1804         }
1805         read_unlock_bh(&idev->lock);
1806         if (skb)
1807                 mld_sendpack(skb);
1808 }
1809
1810 /*
1811  * remove zero-count source records from a source filter list
1812  */
1813 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1814 {
1815         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1816
1817         psf_prev = NULL;
1818         for (psf=*ppsf; psf; psf = psf_next) {
1819                 psf_next = psf->sf_next;
1820                 if (psf->sf_crcount == 0) {
1821                         if (psf_prev)
1822                                 psf_prev->sf_next = psf->sf_next;
1823                         else
1824                                 *ppsf = psf->sf_next;
1825                         kfree(psf);
1826                 } else
1827                         psf_prev = psf;
1828         }
1829 }
1830
1831 static void mld_send_cr(struct inet6_dev *idev)
1832 {
1833         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1834         struct sk_buff *skb = NULL;
1835         int type, dtype;
1836
1837         read_lock_bh(&idev->lock);
1838         spin_lock(&idev->mc_lock);
1839
1840         /* deleted MCA's */
1841         pmc_prev = NULL;
1842         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1843                 pmc_next = pmc->next;
1844                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1845                         type = MLD2_BLOCK_OLD_SOURCES;
1846                         dtype = MLD2_BLOCK_OLD_SOURCES;
1847                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1848                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1849                 }
1850                 if (pmc->mca_crcount) {
1851                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1852                                 type = MLD2_CHANGE_TO_INCLUDE;
1853                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1854                         }
1855                         pmc->mca_crcount--;
1856                         if (pmc->mca_crcount == 0) {
1857                                 mld_clear_zeros(&pmc->mca_tomb);
1858                                 mld_clear_zeros(&pmc->mca_sources);
1859                         }
1860                 }
1861                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1862                     !pmc->mca_sources) {
1863                         if (pmc_prev)
1864                                 pmc_prev->next = pmc_next;
1865                         else
1866                                 idev->mc_tomb = pmc_next;
1867                         in6_dev_put(pmc->idev);
1868                         kfree(pmc);
1869                 } else
1870                         pmc_prev = pmc;
1871         }
1872         spin_unlock(&idev->mc_lock);
1873
1874         /* change recs */
1875         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1876                 spin_lock_bh(&pmc->mca_lock);
1877                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1878                         type = MLD2_BLOCK_OLD_SOURCES;
1879                         dtype = MLD2_ALLOW_NEW_SOURCES;
1880                 } else {
1881                         type = MLD2_ALLOW_NEW_SOURCES;
1882                         dtype = MLD2_BLOCK_OLD_SOURCES;
1883                 }
1884                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1885                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1886
1887                 /* filter mode changes */
1888                 if (pmc->mca_crcount) {
1889                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1890                                 type = MLD2_CHANGE_TO_EXCLUDE;
1891                         else
1892                                 type = MLD2_CHANGE_TO_INCLUDE;
1893                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1894                         pmc->mca_crcount--;
1895                 }
1896                 spin_unlock_bh(&pmc->mca_lock);
1897         }
1898         read_unlock_bh(&idev->lock);
1899         if (!skb)
1900                 return;
1901         (void) mld_sendpack(skb);
1902 }
1903
1904 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1905 {
1906         struct net *net = dev_net(dev);
1907         struct sock *sk = net->ipv6.igmp_sk;
1908         struct inet6_dev *idev;
1909         struct sk_buff *skb;
1910         struct mld_msg *hdr;
1911         const struct in6_addr *snd_addr, *saddr;
1912         struct in6_addr addr_buf;
1913         int hlen = LL_RESERVED_SPACE(dev);
1914         int tlen = dev->needed_tailroom;
1915         int err, len, payload_len, full_len;
1916         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1917                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1918                      IPV6_TLV_PADN, 0 };
1919         struct flowi6 fl6;
1920         struct dst_entry *dst;
1921
1922         if (type == ICMPV6_MGM_REDUCTION)
1923                 snd_addr = &in6addr_linklocal_allrouters;
1924         else
1925                 snd_addr = addr;
1926
1927         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1928         payload_len = len + sizeof(ra);
1929         full_len = sizeof(struct ipv6hdr) + payload_len;
1930
1931         rcu_read_lock();
1932         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1933                       IPSTATS_MIB_OUT, full_len);
1934         rcu_read_unlock();
1935
1936         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1937
1938         if (skb == NULL) {
1939                 rcu_read_lock();
1940                 IP6_INC_STATS(net, __in6_dev_get(dev),
1941                               IPSTATS_MIB_OUTDISCARDS);
1942                 rcu_read_unlock();
1943                 return;
1944         }
1945         skb->priority = TC_PRIO_CONTROL;
1946         skb_reserve(skb, hlen);
1947
1948         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1949                 /* <draft-ietf-magma-mld-source-05.txt>:
1950                  * use unspecified address as the source address
1951                  * when a valid link-local address is not available.
1952                  */
1953                 saddr = &in6addr_any;
1954         } else
1955                 saddr = &addr_buf;
1956
1957         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1958
1959         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1960
1961         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1962         memset(hdr, 0, sizeof(struct mld_msg));
1963         hdr->mld_type = type;
1964         hdr->mld_mca = *addr;
1965
1966         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1967                                          IPPROTO_ICMPV6,
1968                                          csum_partial(hdr, len, 0));
1969
1970         rcu_read_lock();
1971         idev = __in6_dev_get(skb->dev);
1972
1973         icmpv6_flow_init(sk, &fl6, type,
1974                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1975                          skb->dev->ifindex);
1976         dst = icmp6_dst_alloc(skb->dev, &fl6);
1977         if (IS_ERR(dst)) {
1978                 err = PTR_ERR(dst);
1979                 goto err_out;
1980         }
1981
1982         skb_dst_set(skb, dst);
1983         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1984                       dst_output);
1985 out:
1986         if (!err) {
1987                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1988                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1989                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1990         } else
1991                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1992
1993         rcu_read_unlock();
1994         return;
1995
1996 err_out:
1997         kfree_skb(skb);
1998         goto out;
1999 }
2000
2001 static void mld_send_initial_cr(struct inet6_dev *idev)
2002 {
2003         struct sk_buff *skb;
2004         struct ifmcaddr6 *pmc;
2005         int type;
2006
2007         if (mld_in_v1_mode(idev))
2008                 return;
2009
2010         skb = NULL;
2011         read_lock_bh(&idev->lock);
2012         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2013                 spin_lock_bh(&pmc->mca_lock);
2014                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2015                         type = MLD2_CHANGE_TO_EXCLUDE;
2016                 else
2017                         type = MLD2_CHANGE_TO_INCLUDE;
2018                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2019                 spin_unlock_bh(&pmc->mca_lock);
2020         }
2021         read_unlock_bh(&idev->lock);
2022         if (skb)
2023                 mld_sendpack(skb);
2024 }
2025
2026 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2027 {
2028         idev->mc_dad_count = idev->mc_qrv;
2029         if (idev->mc_dad_count) {
2030                 mld_send_initial_cr(idev);
2031                 idev->mc_dad_count--;
2032                 if (idev->mc_dad_count)
2033                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2034         }
2035 }
2036
2037 static void mld_dad_timer_expire(unsigned long data)
2038 {
2039         struct inet6_dev *idev = (struct inet6_dev *)data;
2040
2041         mld_send_initial_cr(idev);
2042         if (idev->mc_dad_count) {
2043                 idev->mc_dad_count--;
2044                 if (idev->mc_dad_count)
2045                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2046         }
2047         in6_dev_put(idev);
2048 }
2049
2050 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2051         const struct in6_addr *psfsrc)
2052 {
2053         struct ip6_sf_list *psf, *psf_prev;
2054         int rv = 0;
2055
2056         psf_prev = NULL;
2057         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2058                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2059                         break;
2060                 psf_prev = psf;
2061         }
2062         if (!psf || psf->sf_count[sfmode] == 0) {
2063                 /* source filter not found, or count wrong =>  bug */
2064                 return -ESRCH;
2065         }
2066         psf->sf_count[sfmode]--;
2067         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2068                 struct inet6_dev *idev = pmc->idev;
2069
2070                 /* no more filters for this source */
2071                 if (psf_prev)
2072                         psf_prev->sf_next = psf->sf_next;
2073                 else
2074                         pmc->mca_sources = psf->sf_next;
2075                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2076                     !mld_in_v1_mode(idev)) {
2077                         psf->sf_crcount = idev->mc_qrv;
2078                         psf->sf_next = pmc->mca_tomb;
2079                         pmc->mca_tomb = psf;
2080                         rv = 1;
2081                 } else
2082                         kfree(psf);
2083         }
2084         return rv;
2085 }
2086
2087 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2088                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2089                           int delta)
2090 {
2091         struct ifmcaddr6 *pmc;
2092         int     changerec = 0;
2093         int     i, err;
2094
2095         if (!idev)
2096                 return -ENODEV;
2097         read_lock_bh(&idev->lock);
2098         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2099                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2100                         break;
2101         }
2102         if (!pmc) {
2103                 /* MCA not found?? bug */
2104                 read_unlock_bh(&idev->lock);
2105                 return -ESRCH;
2106         }
2107         spin_lock_bh(&pmc->mca_lock);
2108         sf_markstate(pmc);
2109         if (!delta) {
2110                 if (!pmc->mca_sfcount[sfmode]) {
2111                         spin_unlock_bh(&pmc->mca_lock);
2112                         read_unlock_bh(&idev->lock);
2113                         return -EINVAL;
2114                 }
2115                 pmc->mca_sfcount[sfmode]--;
2116         }
2117         err = 0;
2118         for (i=0; i<sfcount; i++) {
2119                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2120
2121                 changerec |= rv > 0;
2122                 if (!err && rv < 0)
2123                         err = rv;
2124         }
2125         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2126             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2127             pmc->mca_sfcount[MCAST_INCLUDE]) {
2128                 struct ip6_sf_list *psf;
2129
2130                 /* filter mode change */
2131                 pmc->mca_sfmode = MCAST_INCLUDE;
2132                 pmc->mca_crcount = idev->mc_qrv;
2133                 idev->mc_ifc_count = pmc->mca_crcount;
2134                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2135                         psf->sf_crcount = 0;
2136                 mld_ifc_event(pmc->idev);
2137         } else if (sf_setstate(pmc) || changerec)
2138                 mld_ifc_event(pmc->idev);
2139         spin_unlock_bh(&pmc->mca_lock);
2140         read_unlock_bh(&idev->lock);
2141         return err;
2142 }
2143
2144 /*
2145  * Add multicast single-source filter to the interface list
2146  */
2147 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2148         const struct in6_addr *psfsrc)
2149 {
2150         struct ip6_sf_list *psf, *psf_prev;
2151
2152         psf_prev = NULL;
2153         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2154                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2155                         break;
2156                 psf_prev = psf;
2157         }
2158         if (!psf) {
2159                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2160                 if (!psf)
2161                         return -ENOBUFS;
2162
2163                 psf->sf_addr = *psfsrc;
2164                 if (psf_prev) {
2165                         psf_prev->sf_next = psf;
2166                 } else
2167                         pmc->mca_sources = psf;
2168         }
2169         psf->sf_count[sfmode]++;
2170         return 0;
2171 }
2172
2173 static void sf_markstate(struct ifmcaddr6 *pmc)
2174 {
2175         struct ip6_sf_list *psf;
2176         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2177
2178         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2179                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2180                         psf->sf_oldin = mca_xcount ==
2181                                 psf->sf_count[MCAST_EXCLUDE] &&
2182                                 !psf->sf_count[MCAST_INCLUDE];
2183                 } else
2184                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2185 }
2186
2187 static int sf_setstate(struct ifmcaddr6 *pmc)
2188 {
2189         struct ip6_sf_list *psf, *dpsf;
2190         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2191         int qrv = pmc->idev->mc_qrv;
2192         int new_in, rv;
2193
2194         rv = 0;
2195         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2196                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2197                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2198                                 !psf->sf_count[MCAST_INCLUDE];
2199                 } else
2200                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2201                 if (new_in) {
2202                         if (!psf->sf_oldin) {
2203                                 struct ip6_sf_list *prev = NULL;
2204
2205                                 for (dpsf=pmc->mca_tomb; dpsf;
2206                                      dpsf=dpsf->sf_next) {
2207                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2208                                             &psf->sf_addr))
2209                                                 break;
2210                                         prev = dpsf;
2211                                 }
2212                                 if (dpsf) {
2213                                         if (prev)
2214                                                 prev->sf_next = dpsf->sf_next;
2215                                         else
2216                                                 pmc->mca_tomb = dpsf->sf_next;
2217                                         kfree(dpsf);
2218                                 }
2219                                 psf->sf_crcount = qrv;
2220                                 rv++;
2221                         }
2222                 } else if (psf->sf_oldin) {
2223                         psf->sf_crcount = 0;
2224                         /*
2225                          * add or update "delete" records if an active filter
2226                          * is now inactive
2227                          */
2228                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2229                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2230                                     &psf->sf_addr))
2231                                         break;
2232                         if (!dpsf) {
2233                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2234                                 if (!dpsf)
2235                                         continue;
2236                                 *dpsf = *psf;
2237                                 /* pmc->mca_lock held by callers */
2238                                 dpsf->sf_next = pmc->mca_tomb;
2239                                 pmc->mca_tomb = dpsf;
2240                         }
2241                         dpsf->sf_crcount = qrv;
2242                         rv++;
2243                 }
2244         }
2245         return rv;
2246 }
2247
2248 /*
2249  * Add multicast source filter list to the interface list
2250  */
2251 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2252                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2253                           int delta)
2254 {
2255         struct ifmcaddr6 *pmc;
2256         int     isexclude;
2257         int     i, err;
2258
2259         if (!idev)
2260                 return -ENODEV;
2261         read_lock_bh(&idev->lock);
2262         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2263                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2264                         break;
2265         }
2266         if (!pmc) {
2267                 /* MCA not found?? bug */
2268                 read_unlock_bh(&idev->lock);
2269                 return -ESRCH;
2270         }
2271         spin_lock_bh(&pmc->mca_lock);
2272
2273         sf_markstate(pmc);
2274         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2275         if (!delta)
2276                 pmc->mca_sfcount[sfmode]++;
2277         err = 0;
2278         for (i=0; i<sfcount; i++) {
2279                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2280                 if (err)
2281                         break;
2282         }
2283         if (err) {
2284                 int j;
2285
2286                 if (!delta)
2287                         pmc->mca_sfcount[sfmode]--;
2288                 for (j=0; j<i; j++)
2289                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2290         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2291                 struct ip6_sf_list *psf;
2292
2293                 /* filter mode change */
2294                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2295                         pmc->mca_sfmode = MCAST_EXCLUDE;
2296                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2297                         pmc->mca_sfmode = MCAST_INCLUDE;
2298                 /* else no filters; keep old mode for reports */
2299
2300                 pmc->mca_crcount = idev->mc_qrv;
2301                 idev->mc_ifc_count = pmc->mca_crcount;
2302                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2303                         psf->sf_crcount = 0;
2304                 mld_ifc_event(idev);
2305         } else if (sf_setstate(pmc))
2306                 mld_ifc_event(idev);
2307         spin_unlock_bh(&pmc->mca_lock);
2308         read_unlock_bh(&idev->lock);
2309         return err;
2310 }
2311
2312 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2313 {
2314         struct ip6_sf_list *psf, *nextpsf;
2315
2316         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2317                 nextpsf = psf->sf_next;
2318                 kfree(psf);
2319         }
2320         pmc->mca_tomb = NULL;
2321         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2322                 nextpsf = psf->sf_next;
2323                 kfree(psf);
2324         }
2325         pmc->mca_sources = NULL;
2326         pmc->mca_sfmode = MCAST_EXCLUDE;
2327         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2328         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2329 }
2330
2331
2332 static void igmp6_join_group(struct ifmcaddr6 *ma)
2333 {
2334         unsigned long delay;
2335
2336         if (ma->mca_flags & MAF_NOREPORT)
2337                 return;
2338
2339         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2340
2341         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2342
2343         spin_lock_bh(&ma->mca_lock);
2344         if (del_timer(&ma->mca_timer)) {
2345                 atomic_dec(&ma->mca_refcnt);
2346                 delay = ma->mca_timer.expires - jiffies;
2347         }
2348
2349         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2350                 atomic_inc(&ma->mca_refcnt);
2351         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2352         spin_unlock_bh(&ma->mca_lock);
2353 }
2354
2355 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2356                             struct inet6_dev *idev)
2357 {
2358         int err;
2359
2360         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2361          * so no other readers or writers of iml or its sflist
2362          */
2363         if (!iml->sflist) {
2364                 /* any-source empty exclude case */
2365                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2366         }
2367         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2368                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2369         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2370         iml->sflist = NULL;
2371         return err;
2372 }
2373
2374 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2375 {
2376         if (mld_in_v1_mode(ma->idev)) {
2377                 if (ma->mca_flags & MAF_LAST_REPORTER)
2378                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2379                                 ICMPV6_MGM_REDUCTION);
2380         } else {
2381                 mld_add_delrec(ma->idev, ma);
2382                 mld_ifc_event(ma->idev);
2383         }
2384 }
2385
2386 static void mld_gq_timer_expire(unsigned long data)
2387 {
2388         struct inet6_dev *idev = (struct inet6_dev *)data;
2389
2390         idev->mc_gq_running = 0;
2391         mld_send_report(idev, NULL);
2392         in6_dev_put(idev);
2393 }
2394
2395 static void mld_ifc_timer_expire(unsigned long data)
2396 {
2397         struct inet6_dev *idev = (struct inet6_dev *)data;
2398
2399         mld_send_cr(idev);
2400         if (idev->mc_ifc_count) {
2401                 idev->mc_ifc_count--;
2402                 if (idev->mc_ifc_count)
2403                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2404         }
2405         in6_dev_put(idev);
2406 }
2407
2408 static void mld_ifc_event(struct inet6_dev *idev)
2409 {
2410         if (mld_in_v1_mode(idev))
2411                 return;
2412         idev->mc_ifc_count = idev->mc_qrv;
2413         mld_ifc_start_timer(idev, 1);
2414 }
2415
2416
2417 static void igmp6_timer_handler(unsigned long data)
2418 {
2419         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2420
2421         if (mld_in_v1_mode(ma->idev))
2422                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2423         else
2424                 mld_send_report(ma->idev, ma);
2425
2426         spin_lock(&ma->mca_lock);
2427         ma->mca_flags |=  MAF_LAST_REPORTER;
2428         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2429         spin_unlock(&ma->mca_lock);
2430         ma_put(ma);
2431 }
2432
2433 /* Device changing type */
2434
2435 void ipv6_mc_unmap(struct inet6_dev *idev)
2436 {
2437         struct ifmcaddr6 *i;
2438
2439         /* Install multicast list, except for all-nodes (already installed) */
2440
2441         read_lock_bh(&idev->lock);
2442         for (i = idev->mc_list; i; i = i->next)
2443                 igmp6_group_dropped(i);
2444         read_unlock_bh(&idev->lock);
2445 }
2446
2447 void ipv6_mc_remap(struct inet6_dev *idev)
2448 {
2449         ipv6_mc_up(idev);
2450 }
2451
2452 /* Device going down */
2453
2454 void ipv6_mc_down(struct inet6_dev *idev)
2455 {
2456         struct ifmcaddr6 *i;
2457
2458         /* Withdraw multicast list */
2459
2460         read_lock_bh(&idev->lock);
2461         mld_ifc_stop_timer(idev);
2462         mld_gq_stop_timer(idev);
2463         mld_dad_stop_timer(idev);
2464
2465         for (i = idev->mc_list; i; i=i->next)
2466                 igmp6_group_dropped(i);
2467         read_unlock_bh(&idev->lock);
2468
2469         mld_clear_delrec(idev);
2470 }
2471
2472
2473 /* Device going up */
2474
2475 void ipv6_mc_up(struct inet6_dev *idev)
2476 {
2477         struct ifmcaddr6 *i;
2478
2479         /* Install multicast list, except for all-nodes (already installed) */
2480
2481         read_lock_bh(&idev->lock);
2482         for (i = idev->mc_list; i; i=i->next)
2483                 igmp6_group_added(i);
2484         read_unlock_bh(&idev->lock);
2485 }
2486
2487 /* IPv6 device initialization. */
2488
2489 void ipv6_mc_init_dev(struct inet6_dev *idev)
2490 {
2491         write_lock_bh(&idev->lock);
2492         spin_lock_init(&idev->mc_lock);
2493         idev->mc_gq_running = 0;
2494         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2495                         (unsigned long)idev);
2496         idev->mc_tomb = NULL;
2497         idev->mc_ifc_count = 0;
2498         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2499                         (unsigned long)idev);
2500         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2501                     (unsigned long)idev);
2502
2503         idev->mc_qrv = MLD_QRV_DEFAULT;
2504         idev->mc_qi = MLD_QI_DEFAULT;
2505         idev->mc_qri = MLD_QRI_DEFAULT;
2506
2507         idev->mc_maxdelay = unsolicited_report_interval(idev);
2508         idev->mc_v1_seen = 0;
2509         write_unlock_bh(&idev->lock);
2510 }
2511
2512 /*
2513  *      Device is about to be destroyed: clean up.
2514  */
2515
2516 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2517 {
2518         struct ifmcaddr6 *i;
2519
2520         /* Deactivate timers */
2521         ipv6_mc_down(idev);
2522
2523         /* Delete all-nodes address. */
2524         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2525          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2526          * fail.
2527          */
2528         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2529
2530         if (idev->cnf.forwarding)
2531                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2532
2533         write_lock_bh(&idev->lock);
2534         while ((i = idev->mc_list) != NULL) {
2535                 idev->mc_list = i->next;
2536                 write_unlock_bh(&idev->lock);
2537
2538                 igmp6_group_dropped(i);
2539                 ma_put(i);
2540
2541                 write_lock_bh(&idev->lock);
2542         }
2543         write_unlock_bh(&idev->lock);
2544 }
2545
2546 #ifdef CONFIG_PROC_FS
2547 struct igmp6_mc_iter_state {
2548         struct seq_net_private p;
2549         struct net_device *dev;
2550         struct inet6_dev *idev;
2551 };
2552
2553 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2554
2555 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2556 {
2557         struct ifmcaddr6 *im = NULL;
2558         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2559         struct net *net = seq_file_net(seq);
2560
2561         state->idev = NULL;
2562         for_each_netdev_rcu(net, state->dev) {
2563                 struct inet6_dev *idev;
2564                 idev = __in6_dev_get(state->dev);
2565                 if (!idev)
2566                         continue;
2567                 read_lock_bh(&idev->lock);
2568                 im = idev->mc_list;
2569                 if (im) {
2570                         state->idev = idev;
2571                         break;
2572                 }
2573                 read_unlock_bh(&idev->lock);
2574         }
2575         return im;
2576 }
2577
2578 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2579 {
2580         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2581
2582         im = im->next;
2583         while (!im) {
2584                 if (likely(state->idev != NULL))
2585                         read_unlock_bh(&state->idev->lock);
2586
2587                 state->dev = next_net_device_rcu(state->dev);
2588                 if (!state->dev) {
2589                         state->idev = NULL;
2590                         break;
2591                 }
2592                 state->idev = __in6_dev_get(state->dev);
2593                 if (!state->idev)
2594                         continue;
2595                 read_lock_bh(&state->idev->lock);
2596                 im = state->idev->mc_list;
2597         }
2598         return im;
2599 }
2600
2601 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2602 {
2603         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2604         if (im)
2605                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2606                         --pos;
2607         return pos ? NULL : im;
2608 }
2609
2610 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2611         __acquires(RCU)
2612 {
2613         rcu_read_lock();
2614         return igmp6_mc_get_idx(seq, *pos);
2615 }
2616
2617 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2618 {
2619         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2620
2621         ++*pos;
2622         return im;
2623 }
2624
2625 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2626         __releases(RCU)
2627 {
2628         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2629
2630         if (likely(state->idev != NULL)) {
2631                 read_unlock_bh(&state->idev->lock);
2632                 state->idev = NULL;
2633         }
2634         state->dev = NULL;
2635         rcu_read_unlock();
2636 }
2637
2638 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2639 {
2640         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2641         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2642
2643         seq_printf(seq,
2644                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2645                    state->dev->ifindex, state->dev->name,
2646                    &im->mca_addr,
2647                    im->mca_users, im->mca_flags,
2648                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2649                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2650         return 0;
2651 }
2652
2653 static const struct seq_operations igmp6_mc_seq_ops = {
2654         .start  =       igmp6_mc_seq_start,
2655         .next   =       igmp6_mc_seq_next,
2656         .stop   =       igmp6_mc_seq_stop,
2657         .show   =       igmp6_mc_seq_show,
2658 };
2659
2660 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2661 {
2662         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2663                             sizeof(struct igmp6_mc_iter_state));
2664 }
2665
2666 static const struct file_operations igmp6_mc_seq_fops = {
2667         .owner          =       THIS_MODULE,
2668         .open           =       igmp6_mc_seq_open,
2669         .read           =       seq_read,
2670         .llseek         =       seq_lseek,
2671         .release        =       seq_release_net,
2672 };
2673
2674 struct igmp6_mcf_iter_state {
2675         struct seq_net_private p;
2676         struct net_device *dev;
2677         struct inet6_dev *idev;
2678         struct ifmcaddr6 *im;
2679 };
2680
2681 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2682
2683 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2684 {
2685         struct ip6_sf_list *psf = NULL;
2686         struct ifmcaddr6 *im = NULL;
2687         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2688         struct net *net = seq_file_net(seq);
2689
2690         state->idev = NULL;
2691         state->im = NULL;
2692         for_each_netdev_rcu(net, state->dev) {
2693                 struct inet6_dev *idev;
2694                 idev = __in6_dev_get(state->dev);
2695                 if (unlikely(idev == NULL))
2696                         continue;
2697                 read_lock_bh(&idev->lock);
2698                 im = idev->mc_list;
2699                 if (likely(im != NULL)) {
2700                         spin_lock_bh(&im->mca_lock);
2701                         psf = im->mca_sources;
2702                         if (likely(psf != NULL)) {
2703                                 state->im = im;
2704                                 state->idev = idev;
2705                                 break;
2706                         }
2707                         spin_unlock_bh(&im->mca_lock);
2708                 }
2709                 read_unlock_bh(&idev->lock);
2710         }
2711         return psf;
2712 }
2713
2714 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2715 {
2716         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2717
2718         psf = psf->sf_next;
2719         while (!psf) {
2720                 spin_unlock_bh(&state->im->mca_lock);
2721                 state->im = state->im->next;
2722                 while (!state->im) {
2723                         if (likely(state->idev != NULL))
2724                                 read_unlock_bh(&state->idev->lock);
2725
2726                         state->dev = next_net_device_rcu(state->dev);
2727                         if (!state->dev) {
2728                                 state->idev = NULL;
2729                                 goto out;
2730                         }
2731                         state->idev = __in6_dev_get(state->dev);
2732                         if (!state->idev)
2733                                 continue;
2734                         read_lock_bh(&state->idev->lock);
2735                         state->im = state->idev->mc_list;
2736                 }
2737                 if (!state->im)
2738                         break;
2739                 spin_lock_bh(&state->im->mca_lock);
2740                 psf = state->im->mca_sources;
2741         }
2742 out:
2743         return psf;
2744 }
2745
2746 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2747 {
2748         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2749         if (psf)
2750                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2751                         --pos;
2752         return pos ? NULL : psf;
2753 }
2754
2755 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2756         __acquires(RCU)
2757 {
2758         rcu_read_lock();
2759         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2760 }
2761
2762 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2763 {
2764         struct ip6_sf_list *psf;
2765         if (v == SEQ_START_TOKEN)
2766                 psf = igmp6_mcf_get_first(seq);
2767         else
2768                 psf = igmp6_mcf_get_next(seq, v);
2769         ++*pos;
2770         return psf;
2771 }
2772
2773 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2774         __releases(RCU)
2775 {
2776         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2777         if (likely(state->im != NULL)) {
2778                 spin_unlock_bh(&state->im->mca_lock);
2779                 state->im = NULL;
2780         }
2781         if (likely(state->idev != NULL)) {
2782                 read_unlock_bh(&state->idev->lock);
2783                 state->idev = NULL;
2784         }
2785         state->dev = NULL;
2786         rcu_read_unlock();
2787 }
2788
2789 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2790 {
2791         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2792         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2793
2794         if (v == SEQ_START_TOKEN) {
2795                 seq_printf(seq,
2796                            "%3s %6s "
2797                            "%32s %32s %6s %6s\n", "Idx",
2798                            "Device", "Multicast Address",
2799                            "Source Address", "INC", "EXC");
2800         } else {
2801                 seq_printf(seq,
2802                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2803                            state->dev->ifindex, state->dev->name,
2804                            &state->im->mca_addr,
2805                            &psf->sf_addr,
2806                            psf->sf_count[MCAST_INCLUDE],
2807                            psf->sf_count[MCAST_EXCLUDE]);
2808         }
2809         return 0;
2810 }
2811
2812 static const struct seq_operations igmp6_mcf_seq_ops = {
2813         .start  =       igmp6_mcf_seq_start,
2814         .next   =       igmp6_mcf_seq_next,
2815         .stop   =       igmp6_mcf_seq_stop,
2816         .show   =       igmp6_mcf_seq_show,
2817 };
2818
2819 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2820 {
2821         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2822                             sizeof(struct igmp6_mcf_iter_state));
2823 }
2824
2825 static const struct file_operations igmp6_mcf_seq_fops = {
2826         .owner          =       THIS_MODULE,
2827         .open           =       igmp6_mcf_seq_open,
2828         .read           =       seq_read,
2829         .llseek         =       seq_lseek,
2830         .release        =       seq_release_net,
2831 };
2832
2833 static int __net_init igmp6_proc_init(struct net *net)
2834 {
2835         int err;
2836
2837         err = -ENOMEM;
2838         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2839                 goto out;
2840         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2841                          &igmp6_mcf_seq_fops))
2842                 goto out_proc_net_igmp6;
2843
2844         err = 0;
2845 out:
2846         return err;
2847
2848 out_proc_net_igmp6:
2849         remove_proc_entry("igmp6", net->proc_net);
2850         goto out;
2851 }
2852
2853 static void __net_exit igmp6_proc_exit(struct net *net)
2854 {
2855         remove_proc_entry("mcfilter6", net->proc_net);
2856         remove_proc_entry("igmp6", net->proc_net);
2857 }
2858 #else
2859 static inline int igmp6_proc_init(struct net *net)
2860 {
2861         return 0;
2862 }
2863 static inline void igmp6_proc_exit(struct net *net)
2864 {
2865 }
2866 #endif
2867
2868 static int __net_init igmp6_net_init(struct net *net)
2869 {
2870         int err;
2871
2872         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2873                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2874         if (err < 0) {
2875                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2876                        err);
2877                 goto out;
2878         }
2879
2880         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2881
2882         err = igmp6_proc_init(net);
2883         if (err)
2884                 goto out_sock_create;
2885 out:
2886         return err;
2887
2888 out_sock_create:
2889         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2890         goto out;
2891 }
2892
2893 static void __net_exit igmp6_net_exit(struct net *net)
2894 {
2895         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2896         igmp6_proc_exit(net);
2897 }
2898
2899 static struct pernet_operations igmp6_net_ops = {
2900         .init = igmp6_net_init,
2901         .exit = igmp6_net_exit,
2902 };
2903
2904 int __init igmp6_init(void)
2905 {
2906         return register_pernet_subsys(&igmp6_net_ops);
2907 }
2908
2909 void igmp6_cleanup(void)
2910 {
2911         unregister_pernet_subsys(&igmp6_net_ops);
2912 }