net/ipv6/mcast.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      Multicast support for IPv6
   4  *      Linux INET6 implementation
   5  *
   6  *      Authors:
   7  *      Pedro Roque             <roque@di.fc.ul.pt>
   8  *
   9  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
  10  */
  11
  12 /* Changes:
  13  *
  14  *      yoshfuji        : fix format of router-alert option
  15  *      YOSHIFUJI Hideaki @USAGI:
  16  *              Fixed source address for MLD message based on
  17  *              <draft-ietf-magma-mld-source-05.txt>.
  18  *      YOSHIFUJI Hideaki @USAGI:
  19  *              - Ignore Queries for invalid addresses.
  20  *              - MLD for link-local addresses.
  21  *      David L Stevens <dlstevens@us.ibm.com>:
  22  *              - MLDv2 support
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/errno.h>
  27 #include <linux/types.h>
  28 #include <linux/string.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/times.h>
  33 #include <linux/net.h>
  34 #include <linux/in.h>
  35 #include <linux/in6.h>
  36 #include <linux/netdevice.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/route.h>
  39 #include <linux/init.h>
  40 #include <linux/proc_fs.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/slab.h>
  43 #include <linux/pkt_sched.h>
  44 #include <net/mld.h>
  45
  46 #include <linux/netfilter.h>
  47 #include <linux/netfilter_ipv6.h>
  48
  49 #include <net/net_namespace.h>
  50 #include <net/sock.h>
  51 #include <net/snmp.h>
  52
  53 #include <net/ipv6.h>
  54 #include <net/protocol.h>
  55 #include <net/if_inet6.h>
  56 #include <net/ndisc.h>
  57 #include <net/addrconf.h>
  58 #include <net/ip6_route.h>
  59 #include <net/inet_common.h>
  60
  61 #include <net/ip6_checksum.h>
  62
  63 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  64 static int __mld2_query_bugs[] __attribute__((__unused__)) = {
  65         BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
  66         BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
  67         BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
  68 };
  69
  70 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  71
  72 static void igmp6_join_group(struct ifmcaddr6 *ma);
  73 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  74 static void igmp6_timer_handler(struct timer_list *t);
  75
  76 static void mld_gq_timer_expire(struct timer_list *t);
  77 static void mld_ifc_timer_expire(struct timer_list *t);
  78 static void mld_ifc_event(struct inet6_dev *idev);
  79 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  80 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  81 static void mld_clear_delrec(struct inet6_dev *idev);
  82 static bool mld_in_v1_mode(const struct inet6_dev *idev);
  83 static int sf_setstate(struct ifmcaddr6 *pmc);
  84 static void sf_markstate(struct ifmcaddr6 *pmc);
  85 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
  86 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  87                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
  88                           int delta);
  89 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  90                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
  91                           int delta);
  92 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
  93                             struct inet6_dev *idev);
  94 static int __ipv6_dev_mc_inc(struct net_device *dev,
  95                              const struct in6_addr *addr, unsigned int mode);
  96
  97 #define MLD_QRV_DEFAULT         2
  98 /* RFC3810, 9.2. Query Interval */
  99 #define MLD_QI_DEFAULT          (125 * HZ)
 100 /* RFC3810, 9.3. Query Response Interval */
 101 #define MLD_QRI_DEFAULT         (10 * HZ)
 102
 103 /* RFC3810, 8.1 Query Version Distinctions */
 104 #define MLD_V1_QUERY_LEN        24
 105 #define MLD_V2_QUERY_LEN_MIN    28
 106
 107 #define IPV6_MLD_MAX_MSF        64
 108
 109 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 110 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
 111
 112 /*
 113  *      socket join on multicast group
 114  */
 115
 116 #define for_each_pmc_rcu(np, pmc)                               \
 117         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 118              pmc != NULL;                                       \
 119              pmc = rcu_dereference(pmc->next))
 120
 121 static int unsolicited_report_interval(struct inet6_dev *idev)
 122 {
 123         int iv;
 124
 125         if (mld_in_v1_mode(idev))
 126                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 127         else
 128                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 129
 130         return iv > 0 ? iv : 1;
 131 }
 132
 133 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
 134                                const struct in6_addr *addr, unsigned int mode)
 135 {
 136         struct net_device *dev = NULL;
 137         struct ipv6_mc_socklist *mc_lst;
 138         struct ipv6_pinfo *np = inet6_sk(sk);
 139         struct net *net = sock_net(sk);
 140         int err;
 141
 142         ASSERT_RTNL();
 143
 144         if (!ipv6_addr_is_multicast(addr))
 145                 return -EINVAL;
 146
 147         rcu_read_lock();
 148         for_each_pmc_rcu(np, mc_lst) {
 149                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 150                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 151                         rcu_read_unlock();
 152                         return -EADDRINUSE;
 153                 }
 154         }
 155         rcu_read_unlock();
 156
 157         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 158
 159         if (!mc_lst)
 160                 return -ENOMEM;
 161
 162         mc_lst->next = NULL;
 163         mc_lst->addr = *addr;
 164
 165         if (ifindex == 0) {
 166                 struct rt6_info *rt;
 167                 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
 168                 if (rt) {
 169                         dev = rt->dst.dev;
 170                         ip6_rt_put(rt);
 171                 }
 172         } else
 173                 dev = __dev_get_by_index(net, ifindex);
 174
 175         if (!dev) {
 176                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 177                 return -ENODEV;
 178         }
 179
 180         mc_lst->ifindex = dev->ifindex;
 181         mc_lst->sfmode = mode;
 182         rwlock_init(&mc_lst->sflock);
 183         mc_lst->sflist = NULL;
 184
 185         /*
 186          *      now add/increase the group membership on the device
 187          */
 188
 189         err = __ipv6_dev_mc_inc(dev, addr, mode);
 190
 191         if (err) {
 192                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 193                 return err;
 194         }
 195
 196         mc_lst->next = np->ipv6_mc_list;
 197         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 198
 199         return 0;
 200 }
 201
 202 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 203 {
 204         return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
 205 }
 206 EXPORT_SYMBOL(ipv6_sock_mc_join);
 207
 208 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
 209                           const struct in6_addr *addr, unsigned int mode)
 210 {
 211         return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
 212 }
 213
 214 /*
 215  *      socket leave on multicast group
 216  */
 217 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 218 {
 219         struct ipv6_pinfo *np = inet6_sk(sk);
 220         struct ipv6_mc_socklist *mc_lst;
 221         struct ipv6_mc_socklist __rcu **lnk;
 222         struct net *net = sock_net(sk);
 223
 224         ASSERT_RTNL();
 225
 226         if (!ipv6_addr_is_multicast(addr))
 227                 return -EINVAL;
 228
 229         for (lnk = &np->ipv6_mc_list;
 230              (mc_lst = rtnl_dereference(*lnk)) != NULL;
 231               lnk = &mc_lst->next) {
 232                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 233                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 234                         struct net_device *dev;
 235
 236                         *lnk = mc_lst->next;
 237
 238                         dev = __dev_get_by_index(net, mc_lst->ifindex);
 239                         if (dev) {
 240                                 struct inet6_dev *idev = __in6_dev_get(dev);
 241
 242                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 243                                 if (idev)
 244                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 245                         } else
 246                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 247
 248                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 249                         kfree_rcu(mc_lst, rcu);
 250                         return 0;
 251                 }
 252         }
 253
 254         return -EADDRNOTAVAIL;
 255 }
 256 EXPORT_SYMBOL(ipv6_sock_mc_drop);
 257
 258 /* called with rcu_read_lock() */
 259 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 260                                              const struct in6_addr *group,
 261                                              int ifindex)
 262 {
 263         struct net_device *dev = NULL;
 264         struct inet6_dev *idev = NULL;
 265
 266         if (ifindex == 0) {
 267                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
 268
 269                 if (rt) {
 270                         dev = rt->dst.dev;
 271                         ip6_rt_put(rt);
 272                 }
 273         } else
 274                 dev = dev_get_by_index_rcu(net, ifindex);
 275
 276         if (!dev)
 277                 return NULL;
 278         idev = __in6_dev_get(dev);
 279         if (!idev)
 280                 return NULL;
 281         read_lock_bh(&idev->lock);
 282         if (idev->dead) {
 283                 read_unlock_bh(&idev->lock);
 284                 return NULL;
 285         }
 286         return idev;
 287 }
 288
 289 void __ipv6_sock_mc_close(struct sock *sk)
 290 {
 291         struct ipv6_pinfo *np = inet6_sk(sk);
 292         struct ipv6_mc_socklist *mc_lst;
 293         struct net *net = sock_net(sk);
 294
 295         ASSERT_RTNL();
 296
 297         while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
 298                 struct net_device *dev;
 299
 300                 np->ipv6_mc_list = mc_lst->next;
 301
 302                 dev = __dev_get_by_index(net, mc_lst->ifindex);
 303                 if (dev) {
 304                         struct inet6_dev *idev = __in6_dev_get(dev);
 305
 306                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 307                         if (idev)
 308                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 309                 } else
 310                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 311
 312                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 313                 kfree_rcu(mc_lst, rcu);
 314         }
 315 }
 316
 317 void ipv6_sock_mc_close(struct sock *sk)
 318 {
 319         struct ipv6_pinfo *np = inet6_sk(sk);
 320
 321         if (!rcu_access_pointer(np->ipv6_mc_list))
 322                 return;
 323         rtnl_lock();
 324         __ipv6_sock_mc_close(sk);
 325         rtnl_unlock();
 326 }
 327
 328 int ip6_mc_source(int add, int omode, struct sock *sk,
 329         struct group_source_req *pgsr)
 330 {
 331         struct in6_addr *source, *group;
 332         struct ipv6_mc_socklist *pmc;
 333         struct inet6_dev *idev;
 334         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 335         struct ip6_sf_socklist *psl;
 336         struct net *net = sock_net(sk);
 337         int i, j, rv;
 338         int leavegroup = 0;
 339         int pmclocked = 0;
 340         int err;
 341
 342         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 343         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 344
 345         if (!ipv6_addr_is_multicast(group))
 346                 return -EINVAL;
 347
 348         rcu_read_lock();
 349         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 350         if (!idev) {
 351                 rcu_read_unlock();
 352                 return -ENODEV;
 353         }
 354
 355         err = -EADDRNOTAVAIL;
 356
 357         for_each_pmc_rcu(inet6, pmc) {
 358                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 359                         continue;
 360                 if (ipv6_addr_equal(&pmc->addr, group))
 361                         break;
 362         }
 363         if (!pmc) {             /* must have a prior join */
 364                 err = -EINVAL;
 365                 goto done;
 366         }
 367         /* if a source filter was set, must be the same mode as before */
 368         if (pmc->sflist) {
 369                 if (pmc->sfmode != omode) {
 370                         err = -EINVAL;
 371                         goto done;
 372                 }
 373         } else if (pmc->sfmode != omode) {
 374                 /* allow mode switches for empty-set filters */
 375                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 376                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 377                 pmc->sfmode = omode;
 378         }
 379
 380         write_lock(&pmc->sflock);
 381         pmclocked = 1;
 382
 383         psl = pmc->sflist;
 384         if (!add) {
 385                 if (!psl)
 386                         goto done;      /* err = -EADDRNOTAVAIL */
 387                 rv = !0;
 388                 for (i = 0; i < psl->sl_count; i++) {
 389                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 390                         if (rv == 0)
 391                                 break;
 392                 }
 393                 if (rv)         /* source not found */
 394                         goto done;      /* err = -EADDRNOTAVAIL */
 395
 396                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 397                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 398                         leavegroup = 1;
 399                         goto done;
 400                 }
 401
 402                 /* update the interface filter */
 403                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 404
 405                 for (j = i+1; j < psl->sl_count; j++)
 406                         psl->sl_addr[j-1] = psl->sl_addr[j];
 407                 psl->sl_count--;
 408                 err = 0;
 409                 goto done;
 410         }
 411         /* else, add a new source to the filter */
 412
 413         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 414                 err = -ENOBUFS;
 415                 goto done;
 416         }
 417         if (!psl || psl->sl_count == psl->sl_max) {
 418                 struct ip6_sf_socklist *newpsl;
 419                 int count = IP6_SFBLOCK;
 420
 421                 if (psl)
 422                         count += psl->sl_max;
 423                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 424                 if (!newpsl) {
 425                         err = -ENOBUFS;
 426                         goto done;
 427                 }
 428                 newpsl->sl_max = count;
 429                 newpsl->sl_count = count - IP6_SFBLOCK;
 430                 if (psl) {
 431                         for (i = 0; i < psl->sl_count; i++)
 432                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 433                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 434                 }
 435                 pmc->sflist = psl = newpsl;
 436         }
 437         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 438         for (i = 0; i < psl->sl_count; i++) {
 439                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 440                 if (rv == 0) /* There is an error in the address. */
 441                         goto done;
 442         }
 443         for (j = psl->sl_count-1; j >= i; j--)
 444                 psl->sl_addr[j+1] = psl->sl_addr[j];
 445         psl->sl_addr[i] = *source;
 446         psl->sl_count++;
 447         err = 0;
 448         /* update the interface list */
 449         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 450 done:
 451         if (pmclocked)
 452                 write_unlock(&pmc->sflock);
 453         read_unlock_bh(&idev->lock);
 454         rcu_read_unlock();
 455         if (leavegroup)
 456                 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 457         return err;
 458 }
 459
 460 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 461 {
 462         const struct in6_addr *group;
 463         struct ipv6_mc_socklist *pmc;
 464         struct inet6_dev *idev;
 465         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 466         struct ip6_sf_socklist *newpsl, *psl;
 467         struct net *net = sock_net(sk);
 468         int leavegroup = 0;
 469         int i, err;
 470
 471         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 472
 473         if (!ipv6_addr_is_multicast(group))
 474                 return -EINVAL;
 475         if (gsf->gf_fmode != MCAST_INCLUDE &&
 476             gsf->gf_fmode != MCAST_EXCLUDE)
 477                 return -EINVAL;
 478
 479         rcu_read_lock();
 480         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 481
 482         if (!idev) {
 483                 rcu_read_unlock();
 484                 return -ENODEV;
 485         }
 486
 487         err = 0;
 488
 489         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 490                 leavegroup = 1;
 491                 goto done;
 492         }
 493
 494         for_each_pmc_rcu(inet6, pmc) {
 495                 if (pmc->ifindex != gsf->gf_interface)
 496                         continue;
 497                 if (ipv6_addr_equal(&pmc->addr, group))
 498                         break;
 499         }
 500         if (!pmc) {             /* must have a prior join */
 501                 err = -EINVAL;
 502                 goto done;
 503         }
 504         if (gsf->gf_numsrc) {
 505                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 506                                                           GFP_ATOMIC);
 507                 if (!newpsl) {
 508                         err = -ENOBUFS;
 509                         goto done;
 510                 }
 511                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 512                 for (i = 0; i < newpsl->sl_count; ++i) {
 513                         struct sockaddr_in6 *psin6;
 514
 515                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 516                         newpsl->sl_addr[i] = psin6->sin6_addr;
 517                 }
 518                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 519                         newpsl->sl_count, newpsl->sl_addr, 0);
 520                 if (err) {
 521                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 522                         goto done;
 523                 }
 524         } else {
 525                 newpsl = NULL;
 526                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 527         }
 528
 529         write_lock(&pmc->sflock);
 530         psl = pmc->sflist;
 531         if (psl) {
 532                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 533                         psl->sl_count, psl->sl_addr, 0);
 534                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 535         } else
 536                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 537         pmc->sflist = newpsl;
 538         pmc->sfmode = gsf->gf_fmode;
 539         write_unlock(&pmc->sflock);
 540         err = 0;
 541 done:
 542         read_unlock_bh(&idev->lock);
 543         rcu_read_unlock();
 544         if (leavegroup)
 545                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 546         return err;
 547 }
 548
 549 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 550         struct group_filter __user *optval, int __user *optlen)
 551 {
 552         int err, i, count, copycount;
 553         const struct in6_addr *group;
 554         struct ipv6_mc_socklist *pmc;
 555         struct inet6_dev *idev;
 556         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 557         struct ip6_sf_socklist *psl;
 558         struct net *net = sock_net(sk);
 559
 560         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 561
 562         if (!ipv6_addr_is_multicast(group))
 563                 return -EINVAL;
 564
 565         rcu_read_lock();
 566         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 567
 568         if (!idev) {
 569                 rcu_read_unlock();
 570                 return -ENODEV;
 571         }
 572
 573         err = -EADDRNOTAVAIL;
 574         /* changes to the ipv6_mc_list require the socket lock and
 575          * rtnl lock. We have the socket lock and rcu read lock,
 576          * so reading the list is safe.
 577          */
 578
 579         for_each_pmc_rcu(inet6, pmc) {
 580                 if (pmc->ifindex != gsf->gf_interface)
 581                         continue;
 582                 if (ipv6_addr_equal(group, &pmc->addr))
 583                         break;
 584         }
 585         if (!pmc)               /* must have a prior join */
 586                 goto done;
 587         gsf->gf_fmode = pmc->sfmode;
 588         psl = pmc->sflist;
 589         count = psl ? psl->sl_count : 0;
 590         read_unlock_bh(&idev->lock);
 591         rcu_read_unlock();
 592
 593         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 594         gsf->gf_numsrc = count;
 595         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 596             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 597                 return -EFAULT;
 598         }
 599         /* changes to psl require the socket lock, and a write lock
 600          * on pmc->sflock. We have the socket lock so reading here is safe.
 601          */
 602         for (i = 0; i < copycount; i++) {
 603                 struct sockaddr_in6 *psin6;
 604                 struct sockaddr_storage ss;
 605
 606                 psin6 = (struct sockaddr_in6 *)&ss;
 607                 memset(&ss, 0, sizeof(ss));
 608                 psin6->sin6_family = AF_INET6;
 609                 psin6->sin6_addr = psl->sl_addr[i];
 610                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 611                         return -EFAULT;
 612         }
 613         return 0;
 614 done:
 615         read_unlock_bh(&idev->lock);
 616         rcu_read_unlock();
 617         return err;
 618 }
 619
 620 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 621                     const struct in6_addr *src_addr)
 622 {
 623         struct ipv6_pinfo *np = inet6_sk(sk);
 624         struct ipv6_mc_socklist *mc;
 625         struct ip6_sf_socklist *psl;
 626         bool rv = true;
 627
 628         rcu_read_lock();
 629         for_each_pmc_rcu(np, mc) {
 630                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 631                         break;
 632         }
 633         if (!mc) {
 634                 rcu_read_unlock();
 635                 return np->mc_all;
 636         }
 637         read_lock(&mc->sflock);
 638         psl = mc->sflist;
 639         if (!psl) {
 640                 rv = mc->sfmode == MCAST_EXCLUDE;
 641         } else {
 642                 int i;
 643
 644                 for (i = 0; i < psl->sl_count; i++) {
 645                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 646                                 break;
 647                 }
 648                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 649                         rv = false;
 650                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 651                         rv = false;
 652         }
 653         read_unlock(&mc->sflock);
 654         rcu_read_unlock();
 655
 656         return rv;
 657 }
 658
 659 static void igmp6_group_added(struct ifmcaddr6 *mc)
 660 {
 661         struct net_device *dev = mc->idev->dev;
 662         char buf[MAX_ADDR_LEN];
 663
 664         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 665             IPV6_ADDR_SCOPE_LINKLOCAL)
 666                 return;
 667
 668         spin_lock_bh(&mc->mca_lock);
 669         if (!(mc->mca_flags&MAF_LOADED)) {
 670                 mc->mca_flags |= MAF_LOADED;
 671                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 672                         dev_mc_add(dev, buf);
 673         }
 674         spin_unlock_bh(&mc->mca_lock);
 675
 676         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 677                 return;
 678
 679         if (mld_in_v1_mode(mc->idev)) {
 680                 igmp6_join_group(mc);
 681                 return;
 682         }
 683         /* else v2 */
 684
 685         /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
 686          * should not send filter-mode change record as the mode
 687          * should be from IN() to IN(A).
 688          */
 689         if (mc->mca_sfmode == MCAST_EXCLUDE)
 690                 mc->mca_crcount = mc->idev->mc_qrv;
 691
 692         mld_ifc_event(mc->idev);
 693 }
 694
 695 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 696 {
 697         struct net_device *dev = mc->idev->dev;
 698         char buf[MAX_ADDR_LEN];
 699
 700         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 701             IPV6_ADDR_SCOPE_LINKLOCAL)
 702                 return;
 703
 704         spin_lock_bh(&mc->mca_lock);
 705         if (mc->mca_flags&MAF_LOADED) {
 706                 mc->mca_flags &= ~MAF_LOADED;
 707                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 708                         dev_mc_del(dev, buf);
 709         }
 710
 711         spin_unlock_bh(&mc->mca_lock);
 712         if (mc->mca_flags & MAF_NOREPORT)
 713                 return;
 714
 715         if (!mc->idev->dead)
 716                 igmp6_leave_group(mc);
 717
 718         spin_lock_bh(&mc->mca_lock);
 719         if (del_timer(&mc->mca_timer))
 720                 refcount_dec(&mc->mca_refcnt);
 721         spin_unlock_bh(&mc->mca_lock);
 722 }
 723
 724 /*
 725  * deleted ifmcaddr6 manipulation
 726  */
 727 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 728 {
 729         struct ifmcaddr6 *pmc;
 730
 731         /* this is an "ifmcaddr6" for convenience; only the fields below
 732          * are actually used. In particular, the refcnt and users are not
 733          * used for management of the delete list. Using the same structure
 734          * for deleted items allows change reports to use common code with
 735          * non-deleted or query-response MCA's.
 736          */
 737         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 738         if (!pmc)
 739                 return;
 740
 741         spin_lock_bh(&im->mca_lock);
 742         spin_lock_init(&pmc->mca_lock);
 743         pmc->idev = im->idev;
 744         in6_dev_hold(idev);
 745         pmc->mca_addr = im->mca_addr;
 746         pmc->mca_crcount = idev->mc_qrv;
 747         pmc->mca_sfmode = im->mca_sfmode;
 748         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 749                 struct ip6_sf_list *psf;
 750
 751                 pmc->mca_tomb = im->mca_tomb;
 752                 pmc->mca_sources = im->mca_sources;
 753                 im->mca_tomb = im->mca_sources = NULL;
 754                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
 755                         psf->sf_crcount = pmc->mca_crcount;
 756         }
 757         spin_unlock_bh(&im->mca_lock);
 758
 759         spin_lock_bh(&idev->mc_lock);
 760         pmc->next = idev->mc_tomb;
 761         idev->mc_tomb = pmc;
 762         spin_unlock_bh(&idev->mc_lock);
 763 }
 764
 765 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 766 {
 767         struct ifmcaddr6 *pmc, *pmc_prev;
 768         struct ip6_sf_list *psf;
 769         struct in6_addr *pmca = &im->mca_addr;
 770
 771         spin_lock_bh(&idev->mc_lock);
 772         pmc_prev = NULL;
 773         for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
 774                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 775                         break;
 776                 pmc_prev = pmc;
 777         }
 778         if (pmc) {
 779                 if (pmc_prev)
 780                         pmc_prev->next = pmc->next;
 781                 else
 782                         idev->mc_tomb = pmc->next;
 783         }
 784         spin_unlock_bh(&idev->mc_lock);
 785
 786         spin_lock_bh(&im->mca_lock);
 787         if (pmc) {
 788                 im->idev = pmc->idev;
 789                 if (im->mca_sfmode == MCAST_INCLUDE) {
 790                         im->mca_tomb = pmc->mca_tomb;
 791                         im->mca_sources = pmc->mca_sources;
 792                         for (psf = im->mca_sources; psf; psf = psf->sf_next)
 793                                 psf->sf_crcount = idev->mc_qrv;
 794                 } else {
 795                         im->mca_crcount = idev->mc_qrv;
 796                 }
 797                 in6_dev_put(pmc->idev);
 798                 kfree(pmc);
 799         }
 800         spin_unlock_bh(&im->mca_lock);
 801 }
 802
 803 static void mld_clear_delrec(struct inet6_dev *idev)
 804 {
 805         struct ifmcaddr6 *pmc, *nextpmc;
 806
 807         spin_lock_bh(&idev->mc_lock);
 808         pmc = idev->mc_tomb;
 809         idev->mc_tomb = NULL;
 810         spin_unlock_bh(&idev->mc_lock);
 811
 812         for (; pmc; pmc = nextpmc) {
 813                 nextpmc = pmc->next;
 814                 ip6_mc_clear_src(pmc);
 815                 in6_dev_put(pmc->idev);
 816                 kfree(pmc);
 817         }
 818
 819         /* clear dead sources, too */
 820         read_lock_bh(&idev->lock);
 821         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
 822                 struct ip6_sf_list *psf, *psf_next;
 823
 824                 spin_lock_bh(&pmc->mca_lock);
 825                 psf = pmc->mca_tomb;
 826                 pmc->mca_tomb = NULL;
 827                 spin_unlock_bh(&pmc->mca_lock);
 828                 for (; psf; psf = psf_next) {
 829                         psf_next = psf->sf_next;
 830                         kfree(psf);
 831                 }
 832         }
 833         read_unlock_bh(&idev->lock);
 834 }
 835
 836 static void mca_get(struct ifmcaddr6 *mc)
 837 {
 838         refcount_inc(&mc->mca_refcnt);
 839 }
 840
 841 static void ma_put(struct ifmcaddr6 *mc)
 842 {
 843         if (refcount_dec_and_test(&mc->mca_refcnt)) {
 844                 in6_dev_put(mc->idev);
 845                 kfree(mc);
 846         }
 847 }
 848
 849 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
 850                                    const struct in6_addr *addr,
 851                                    unsigned int mode)
 852 {
 853         struct ifmcaddr6 *mc;
 854
 855         mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
 856         if (!mc)
 857                 return NULL;
 858
 859         timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
 860
 861         mc->mca_addr = *addr;
 862         mc->idev = idev; /* reference taken by caller */
 863         mc->mca_users = 1;
 864         /* mca_stamp should be updated upon changes */
 865         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 866         refcount_set(&mc->mca_refcnt, 1);
 867         spin_lock_init(&mc->mca_lock);
 868
 869         mc->mca_sfmode = mode;
 870         mc->mca_sfcount[mode] = 1;
 871
 872         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 873             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 874                 mc->mca_flags |= MAF_NOREPORT;
 875
 876         return mc;
 877 }
 878
 879 /*
 880  *      device multicast group inc (add if not found)
 881  */
 882 static int __ipv6_dev_mc_inc(struct net_device *dev,
 883                              const struct in6_addr *addr, unsigned int mode)
 884 {
 885         struct ifmcaddr6 *mc;
 886         struct inet6_dev *idev;
 887
 888         ASSERT_RTNL();
 889
 890         /* we need to take a reference on idev */
 891         idev = in6_dev_get(dev);
 892
 893         if (!idev)
 894                 return -EINVAL;
 895
 896         write_lock_bh(&idev->lock);
 897         if (idev->dead) {
 898                 write_unlock_bh(&idev->lock);
 899                 in6_dev_put(idev);
 900                 return -ENODEV;
 901         }
 902
 903         for (mc = idev->mc_list; mc; mc = mc->next) {
 904                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 905                         mc->mca_users++;
 906                         write_unlock_bh(&idev->lock);
 907                         ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
 908                         in6_dev_put(idev);
 909                         return 0;
 910                 }
 911         }
 912
 913         mc = mca_alloc(idev, addr, mode);
 914         if (!mc) {
 915                 write_unlock_bh(&idev->lock);
 916                 in6_dev_put(idev);
 917                 return -ENOMEM;
 918         }
 919
 920         mc->next = idev->mc_list;
 921         idev->mc_list = mc;
 922
 923         /* Hold this for the code below before we unlock,
 924          * it is already exposed via idev->mc_list.
 925          */
 926         mca_get(mc);
 927         write_unlock_bh(&idev->lock);
 928
 929         mld_del_delrec(idev, mc);
 930         igmp6_group_added(mc);
 931         ma_put(mc);
 932         return 0;
 933 }
 934
 935 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 936 {
 937         return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
 938 }
 939 EXPORT_SYMBOL(ipv6_dev_mc_inc);
 940
 941 /*
 942  *      device multicast group del
 943  */
 944 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 945 {
 946         struct ifmcaddr6 *ma, **map;
 947
 948         ASSERT_RTNL();
 949
 950         write_lock_bh(&idev->lock);
 951         for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
 952                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 953                         if (--ma->mca_users == 0) {
 954                                 *map = ma->next;
 955                                 write_unlock_bh(&idev->lock);
 956
 957                                 igmp6_group_dropped(ma);
 958                                 ip6_mc_clear_src(ma);
 959
 960                                 ma_put(ma);
 961                                 return 0;
 962                         }
 963                         write_unlock_bh(&idev->lock);
 964                         return 0;
 965                 }
 966         }
 967         write_unlock_bh(&idev->lock);
 968
 969         return -ENOENT;
 970 }
 971
 972 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 973 {
 974         struct inet6_dev *idev;
 975         int err;
 976
 977         ASSERT_RTNL();
 978
 979         idev = __in6_dev_get(dev);
 980         if (!idev)
 981                 err = -ENODEV;
 982         else
 983                 err = __ipv6_dev_mc_dec(idev, addr);
 984
 985         return err;
 986 }
 987 EXPORT_SYMBOL(ipv6_dev_mc_dec);
 988
 989 /*
 990  *      check if the interface/address pair is valid
 991  */
 992 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 993                          const struct in6_addr *src_addr)
 994 {
 995         struct inet6_dev *idev;
 996         struct ifmcaddr6 *mc;
 997         bool rv = false;
 998
 999         rcu_read_lock();
1000         idev = __in6_dev_get(dev);
1001         if (idev) {
1002                 read_lock_bh(&idev->lock);
1003                 for (mc = idev->mc_list; mc; mc = mc->next) {
1004                         if (ipv6_addr_equal(&mc->mca_addr, group))
1005                                 break;
1006                 }
1007                 if (mc) {
1008                         if (src_addr && !ipv6_addr_any(src_addr)) {
1009                                 struct ip6_sf_list *psf;
1010
1011                                 spin_lock_bh(&mc->mca_lock);
1012                                 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
1013                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1014                                                 break;
1015                                 }
1016                                 if (psf)
1017                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1018                                                 psf->sf_count[MCAST_EXCLUDE] !=
1019                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1020                                 else
1021                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1022                                 spin_unlock_bh(&mc->mca_lock);
1023                         } else
1024                                 rv = true; /* don't filter unspecified source */
1025                 }
1026                 read_unlock_bh(&idev->lock);
1027         }
1028         rcu_read_unlock();
1029         return rv;
1030 }
1031
1032 static void mld_gq_start_timer(struct inet6_dev *idev)
1033 {
1034         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1035
1036         idev->mc_gq_running = 1;
1037         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1038                 in6_dev_hold(idev);
1039 }
1040
1041 static void mld_gq_stop_timer(struct inet6_dev *idev)
1042 {
1043         idev->mc_gq_running = 0;
1044         if (del_timer(&idev->mc_gq_timer))
1045                 __in6_dev_put(idev);
1046 }
1047
1048 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1049 {
1050         unsigned long tv = prandom_u32() % delay;
1051
1052         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1053                 in6_dev_hold(idev);
1054 }
1055
1056 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1057 {
1058         idev->mc_ifc_count = 0;
1059         if (del_timer(&idev->mc_ifc_timer))
1060                 __in6_dev_put(idev);
1061 }
1062
1063 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1064 {
1065         unsigned long tv = prandom_u32() % delay;
1066
1067         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1068                 in6_dev_hold(idev);
1069 }
1070
1071 static void mld_dad_stop_timer(struct inet6_dev *idev)
1072 {
1073         if (del_timer(&idev->mc_dad_timer))
1074                 __in6_dev_put(idev);
1075 }
1076
1077 /*
1078  *      IGMP handling (alias multicast ICMPv6 messages)
1079  */
1080
1081 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1082 {
1083         unsigned long delay = resptime;
1084
1085         /* Do not start timer for these addresses */
1086         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1087             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1088                 return;
1089
1090         if (del_timer(&ma->mca_timer)) {
1091                 refcount_dec(&ma->mca_refcnt);
1092                 delay = ma->mca_timer.expires - jiffies;
1093         }
1094
1095         if (delay >= resptime)
1096                 delay = prandom_u32() % resptime;
1097
1098         ma->mca_timer.expires = jiffies + delay;
1099         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1100                 refcount_inc(&ma->mca_refcnt);
1101         ma->mca_flags |= MAF_TIMER_RUNNING;
1102 }
1103
1104 /* mark EXCLUDE-mode sources */
1105 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1106                              const struct in6_addr *srcs)
1107 {
1108         struct ip6_sf_list *psf;
1109         int i, scount;
1110
1111         scount = 0;
1112         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1113                 if (scount == nsrcs)
1114                         break;
1115                 for (i = 0; i < nsrcs; i++) {
1116                         /* skip inactive filters */
1117                         if (psf->sf_count[MCAST_INCLUDE] ||
1118                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1119                             psf->sf_count[MCAST_EXCLUDE])
1120                                 break;
1121                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1122                                 scount++;
1123                                 break;
1124                         }
1125                 }
1126         }
1127         pmc->mca_flags &= ~MAF_GSQUERY;
1128         if (scount == nsrcs)    /* all sources excluded */
1129                 return false;
1130         return true;
1131 }
1132
1133 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1134                             const struct in6_addr *srcs)
1135 {
1136         struct ip6_sf_list *psf;
1137         int i, scount;
1138
1139         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1140                 return mld_xmarksources(pmc, nsrcs, srcs);
1141
1142         /* mark INCLUDE-mode sources */
1143
1144         scount = 0;
1145         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1146                 if (scount == nsrcs)
1147                         break;
1148                 for (i = 0; i < nsrcs; i++) {
1149                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1150                                 psf->sf_gsresp = 1;
1151                                 scount++;
1152                                 break;
1153                         }
1154                 }
1155         }
1156         if (!scount) {
1157                 pmc->mca_flags &= ~MAF_GSQUERY;
1158                 return false;
1159         }
1160         pmc->mca_flags |= MAF_GSQUERY;
1161         return true;
1162 }
1163
1164 static int mld_force_mld_version(const struct inet6_dev *idev)
1165 {
1166         /* Normally, both are 0 here. If enforcement to a particular is
1167          * being used, individual device enforcement will have a lower
1168          * precedence over 'all' device (.../conf/all/force_mld_version).
1169          */
1170
1171         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1172                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1173         else
1174                 return idev->cnf.force_mld_version;
1175 }
1176
1177 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1178 {
1179         return mld_force_mld_version(idev) == 2;
1180 }
1181
1182 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1183 {
1184         return mld_force_mld_version(idev) == 1;
1185 }
1186
1187 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1188 {
1189         if (mld_in_v2_mode_only(idev))
1190                 return false;
1191         if (mld_in_v1_mode_only(idev))
1192                 return true;
1193         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1194                 return true;
1195
1196         return false;
1197 }
1198
1199 static void mld_set_v1_mode(struct inet6_dev *idev)
1200 {
1201         /* RFC3810, relevant sections:
1202          *  - 9.1. Robustness Variable
1203          *  - 9.2. Query Interval
1204          *  - 9.3. Query Response Interval
1205          *  - 9.12. Older Version Querier Present Timeout
1206          */
1207         unsigned long switchback;
1208
1209         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1210
1211         idev->mc_v1_seen = jiffies + switchback;
1212 }
1213
1214 static void mld_update_qrv(struct inet6_dev *idev,
1215                            const struct mld2_query *mlh2)
1216 {
1217         /* RFC3810, relevant sections:
1218          *  - 5.1.8. QRV (Querier's Robustness Variable)
1219          *  - 9.1. Robustness Variable
1220          */
1221
1222         /* The value of the Robustness Variable MUST NOT be zero,
1223          * and SHOULD NOT be one. Catch this here if we ever run
1224          * into such a case in future.
1225          */
1226         const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1227         WARN_ON(idev->mc_qrv == 0);
1228
1229         if (mlh2->mld2q_qrv > 0)
1230                 idev->mc_qrv = mlh2->mld2q_qrv;
1231
1232         if (unlikely(idev->mc_qrv < min_qrv)) {
1233                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1234                                      idev->mc_qrv, min_qrv);
1235                 idev->mc_qrv = min_qrv;
1236         }
1237 }
1238
1239 static void mld_update_qi(struct inet6_dev *idev,
1240                           const struct mld2_query *mlh2)
1241 {
1242         /* RFC3810, relevant sections:
1243          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1244          *  - 9.2. Query Interval
1245          *  - 9.12. Older Version Querier Present Timeout
1246          *    (the [Query Interval] in the last Query received)
1247          */
1248         unsigned long mc_qqi;
1249
1250         if (mlh2->mld2q_qqic < 128) {
1251                 mc_qqi = mlh2->mld2q_qqic;
1252         } else {
1253                 unsigned long mc_man, mc_exp;
1254
1255                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1256                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1257
1258                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1259         }
1260
1261         idev->mc_qi = mc_qqi * HZ;
1262 }
1263
1264 static void mld_update_qri(struct inet6_dev *idev,
1265                            const struct mld2_query *mlh2)
1266 {
1267         /* RFC3810, relevant sections:
1268          *  - 5.1.3. Maximum Response Code
1269          *  - 9.3. Query Response Interval
1270          */
1271         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1272 }
1273
1274 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1275                           unsigned long *max_delay, bool v1_query)
1276 {
1277         unsigned long mldv1_md;
1278
1279         /* Ignore v1 queries */
1280         if (mld_in_v2_mode_only(idev))
1281                 return -EINVAL;
1282
1283         mldv1_md = ntohs(mld->mld_maxdelay);
1284
1285         /* When in MLDv1 fallback and a MLDv2 router start-up being
1286          * unaware of current MLDv1 operation, the MRC == MRD mapping
1287          * only works when the exponential algorithm is not being
1288          * used (as MLDv1 is unaware of such things).
1289          *
1290          * According to the RFC author, the MLDv2 implementations
1291          * he's aware of all use a MRC < 32768 on start up queries.
1292          *
1293          * Thus, should we *ever* encounter something else larger
1294          * than that, just assume the maximum possible within our
1295          * reach.
1296          */
1297         if (!v1_query)
1298                 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1299
1300         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1301
1302         /* MLDv1 router present: we need to go into v1 mode *only*
1303          * when an MLDv1 query is received as per section 9.12. of
1304          * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1305          * queries MUST be of exactly 24 octets.
1306          */
1307         if (v1_query)
1308                 mld_set_v1_mode(idev);
1309
1310         /* cancel MLDv2 report timer */
1311         mld_gq_stop_timer(idev);
1312         /* cancel the interface change timer */
1313         mld_ifc_stop_timer(idev);
1314         /* clear deleted report items */
1315         mld_clear_delrec(idev);
1316
1317         return 0;
1318 }
1319
1320 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1321                           unsigned long *max_delay)
1322 {
1323         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1324
1325         mld_update_qrv(idev, mld);
1326         mld_update_qi(idev, mld);
1327         mld_update_qri(idev, mld);
1328
1329         idev->mc_maxdelay = *max_delay;
1330
1331         return 0;
1332 }
1333
1334 /* called with rcu_read_lock() */
1335 int igmp6_event_query(struct sk_buff *skb)
1336 {
1337         struct mld2_query *mlh2 = NULL;
1338         struct ifmcaddr6 *ma;
1339         const struct in6_addr *group;
1340         unsigned long max_delay;
1341         struct inet6_dev *idev;
1342         struct mld_msg *mld;
1343         int group_type;
1344         int mark = 0;
1345         int len, err;
1346
1347         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1348                 return -EINVAL;
1349
1350         /* compute payload length excluding extension headers */
1351         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1352         len -= skb_network_header_len(skb);
1353
1354         /* RFC3810 6.2
1355          * Upon reception of an MLD message that contains a Query, the node
1356          * checks if the source address of the message is a valid link-local
1357          * address, if the Hop Limit is set to 1, and if the Router Alert
1358          * option is present in the Hop-By-Hop Options header of the IPv6
1359          * packet.  If any of these checks fails, the packet is dropped.
1360          */
1361         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1362             ipv6_hdr(skb)->hop_limit != 1 ||
1363             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1364             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1365                 return -EINVAL;
1366
1367         idev = __in6_dev_get(skb->dev);
1368         if (!idev)
1369                 return 0;
1370
1371         mld = (struct mld_msg *)icmp6_hdr(skb);
1372         group = &mld->mld_mca;
1373         group_type = ipv6_addr_type(group);
1374
1375         if (group_type != IPV6_ADDR_ANY &&
1376             !(group_type&IPV6_ADDR_MULTICAST))
1377                 return -EINVAL;
1378
1379         if (len < MLD_V1_QUERY_LEN) {
1380                 return -EINVAL;
1381         } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1382                 err = mld_process_v1(idev, mld, &max_delay,
1383                                      len == MLD_V1_QUERY_LEN);
1384                 if (err < 0)
1385                         return err;
1386         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1387                 int srcs_offset = sizeof(struct mld2_query) -
1388                                   sizeof(struct icmp6hdr);
1389
1390                 if (!pskb_may_pull(skb, srcs_offset))
1391                         return -EINVAL;
1392
1393                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1394
1395                 err = mld_process_v2(idev, mlh2, &max_delay);
1396                 if (err < 0)
1397                         return err;
1398
1399                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1400                         if (mlh2->mld2q_nsrcs)
1401                                 return -EINVAL; /* no sources allowed */
1402
1403                         mld_gq_start_timer(idev);
1404                         return 0;
1405                 }
1406                 /* mark sources to include, if group & source-specific */
1407                 if (mlh2->mld2q_nsrcs != 0) {
1408                         if (!pskb_may_pull(skb, srcs_offset +
1409                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1410                                 return -EINVAL;
1411
1412                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1413                         mark = 1;
1414                 }
1415         } else {
1416                 return -EINVAL;
1417         }
1418
1419         read_lock_bh(&idev->lock);
1420         if (group_type == IPV6_ADDR_ANY) {
1421                 for (ma = idev->mc_list; ma; ma = ma->next) {
1422                         spin_lock_bh(&ma->mca_lock);
1423                         igmp6_group_queried(ma, max_delay);
1424                         spin_unlock_bh(&ma->mca_lock);
1425                 }
1426         } else {
1427                 for (ma = idev->mc_list; ma; ma = ma->next) {
1428                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1429                                 continue;
1430                         spin_lock_bh(&ma->mca_lock);
1431                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1432                                 /* gsquery <- gsquery && mark */
1433                                 if (!mark)
1434                                         ma->mca_flags &= ~MAF_GSQUERY;
1435                         } else {
1436                                 /* gsquery <- mark */
1437                                 if (mark)
1438                                         ma->mca_flags |= MAF_GSQUERY;
1439                                 else
1440                                         ma->mca_flags &= ~MAF_GSQUERY;
1441                         }
1442                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1443                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1444                                 igmp6_group_queried(ma, max_delay);
1445                         spin_unlock_bh(&ma->mca_lock);
1446                         break;
1447                 }
1448         }
1449         read_unlock_bh(&idev->lock);
1450
1451         return 0;
1452 }
1453
1454 /* called with rcu_read_lock() */
1455 int igmp6_event_report(struct sk_buff *skb)
1456 {
1457         struct ifmcaddr6 *ma;
1458         struct inet6_dev *idev;
1459         struct mld_msg *mld;
1460         int addr_type;
1461
1462         /* Our own report looped back. Ignore it. */
1463         if (skb->pkt_type == PACKET_LOOPBACK)
1464                 return 0;
1465
1466         /* send our report if the MC router may not have heard this report */
1467         if (skb->pkt_type != PACKET_MULTICAST &&
1468             skb->pkt_type != PACKET_BROADCAST)
1469                 return 0;
1470
1471         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1472                 return -EINVAL;
1473
1474         mld = (struct mld_msg *)icmp6_hdr(skb);
1475
1476         /* Drop reports with not link local source */
1477         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1478         if (addr_type != IPV6_ADDR_ANY &&
1479             !(addr_type&IPV6_ADDR_LINKLOCAL))
1480                 return -EINVAL;
1481
1482         idev = __in6_dev_get(skb->dev);
1483         if (!idev)
1484                 return -ENODEV;
1485
1486         /*
1487          *      Cancel the timer for this group
1488          */
1489
1490         read_lock_bh(&idev->lock);
1491         for (ma = idev->mc_list; ma; ma = ma->next) {
1492                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1493                         spin_lock(&ma->mca_lock);
1494                         if (del_timer(&ma->mca_timer))
1495                                 refcount_dec(&ma->mca_refcnt);
1496                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1497                         spin_unlock(&ma->mca_lock);
1498                         break;
1499                 }
1500         }
1501         read_unlock_bh(&idev->lock);
1502         return 0;
1503 }
1504
1505 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1506                   int gdeleted, int sdeleted)
1507 {
1508         switch (type) {
1509         case MLD2_MODE_IS_INCLUDE:
1510         case MLD2_MODE_IS_EXCLUDE:
1511                 if (gdeleted || sdeleted)
1512                         return false;
1513                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1514                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1515                                 return true;
1516                         /* don't include if this source is excluded
1517                          * in all filters
1518                          */
1519                         if (psf->sf_count[MCAST_INCLUDE])
1520                                 return type == MLD2_MODE_IS_INCLUDE;
1521                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1522                                 psf->sf_count[MCAST_EXCLUDE];
1523                 }
1524                 return false;
1525         case MLD2_CHANGE_TO_INCLUDE:
1526                 if (gdeleted || sdeleted)
1527                         return false;
1528                 return psf->sf_count[MCAST_INCLUDE] != 0;
1529         case MLD2_CHANGE_TO_EXCLUDE:
1530                 if (gdeleted || sdeleted)
1531                         return false;
1532                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1533                     psf->sf_count[MCAST_INCLUDE])
1534                         return false;
1535                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1536                         psf->sf_count[MCAST_EXCLUDE];
1537         case MLD2_ALLOW_NEW_SOURCES:
1538                 if (gdeleted || !psf->sf_crcount)
1539                         return false;
1540                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1541         case MLD2_BLOCK_OLD_SOURCES:
1542                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1543                         return gdeleted || (psf->sf_crcount && sdeleted);
1544                 return psf->sf_crcount && !gdeleted && !sdeleted;
1545         }
1546         return false;
1547 }
1548
1549 static int
1550 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1551 {
1552         struct ip6_sf_list *psf;
1553         int scount = 0;
1554
1555         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1556                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1557                         continue;
1558                 scount++;
1559         }
1560         return scount;
1561 }
1562
1563 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1564                        struct net_device *dev,
1565                        const struct in6_addr *saddr,
1566                        const struct in6_addr *daddr,
1567                        int proto, int len)
1568 {
1569         struct ipv6hdr *hdr;
1570
1571         skb->protocol = htons(ETH_P_IPV6);
1572         skb->dev = dev;
1573
1574         skb_reset_network_header(skb);
1575         skb_put(skb, sizeof(struct ipv6hdr));
1576         hdr = ipv6_hdr(skb);
1577
1578         ip6_flow_hdr(hdr, 0, 0);
1579
1580         hdr->payload_len = htons(len);
1581         hdr->nexthdr = proto;
1582         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1583
1584         hdr->saddr = *saddr;
1585         hdr->daddr = *daddr;
1586 }
1587
1588 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1589 {
1590         struct net_device *dev = idev->dev;
1591         struct net *net = dev_net(dev);
1592         struct sock *sk = net->ipv6.igmp_sk;
1593         struct sk_buff *skb;
1594         struct mld2_report *pmr;
1595         struct in6_addr addr_buf;
1596         const struct in6_addr *saddr;
1597         int hlen = LL_RESERVED_SPACE(dev);
1598         int tlen = dev->needed_tailroom;
1599         unsigned int size = mtu + hlen + tlen;
1600         int err;
1601         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1602                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1603                      IPV6_TLV_PADN, 0 };
1604
1605         /* we assume size > sizeof(ra) here */
1606         /* limit our allocations to order-0 page */
1607         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1608         skb = sock_alloc_send_skb(sk, size, 1, &err);
1609
1610         if (!skb)
1611                 return NULL;
1612
1613         skb->priority = TC_PRIO_CONTROL;
1614         skb_reserve(skb, hlen);
1615         skb_tailroom_reserve(skb, mtu, tlen);
1616
1617         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1618                 /* <draft-ietf-magma-mld-source-05.txt>:
1619                  * use unspecified address as the source address
1620                  * when a valid link-local address is not available.
1621                  */
1622                 saddr = &in6addr_any;
1623         } else
1624                 saddr = &addr_buf;
1625
1626         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1627
1628         skb_put_data(skb, ra, sizeof(ra));
1629
1630         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1631         skb_put(skb, sizeof(*pmr));
1632         pmr = (struct mld2_report *)skb_transport_header(skb);
1633         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1634         pmr->mld2r_resv1 = 0;
1635         pmr->mld2r_cksum = 0;
1636         pmr->mld2r_resv2 = 0;
1637         pmr->mld2r_ngrec = 0;
1638         return skb;
1639 }
1640
1641 static void mld_sendpack(struct sk_buff *skb)
1642 {
1643         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1644         struct mld2_report *pmr =
1645                               (struct mld2_report *)skb_transport_header(skb);
1646         int payload_len, mldlen;
1647         struct inet6_dev *idev;
1648         struct net *net = dev_net(skb->dev);
1649         int err;
1650         struct flowi6 fl6;
1651         struct dst_entry *dst;
1652
1653         rcu_read_lock();
1654         idev = __in6_dev_get(skb->dev);
1655         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1656
1657         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1658                 sizeof(*pip6);
1659         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1660         pip6->payload_len = htons(payload_len);
1661
1662         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1663                                            IPPROTO_ICMPV6,
1664                                            csum_partial(skb_transport_header(skb),
1665                                                         mldlen, 0));
1666
1667         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1668                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1669                          skb->dev->ifindex);
1670         dst = icmp6_dst_alloc(skb->dev, &fl6);
1671
1672         err = 0;
1673         if (IS_ERR(dst)) {
1674                 err = PTR_ERR(dst);
1675                 dst = NULL;
1676         }
1677         skb_dst_set(skb, dst);
1678         if (err)
1679                 goto err_out;
1680
1681         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1682                       net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1683                       dst_output);
1684 out:
1685         if (!err) {
1686                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1687                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1688         } else {
1689                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1690         }
1691
1692         rcu_read_unlock();
1693         return;
1694
1695 err_out:
1696         kfree_skb(skb);
1697         goto out;
1698 }
1699
1700 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1701 {
1702         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1703 }
1704
1705 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1706         int type, struct mld2_grec **ppgr, unsigned int mtu)
1707 {
1708         struct mld2_report *pmr;
1709         struct mld2_grec *pgr;
1710
1711         if (!skb) {
1712                 skb = mld_newpack(pmc->idev, mtu);
1713                 if (!skb)
1714                         return NULL;
1715         }
1716         pgr = skb_put(skb, sizeof(struct mld2_grec));
1717         pgr->grec_type = type;
1718         pgr->grec_auxwords = 0;
1719         pgr->grec_nsrcs = 0;
1720         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1721         pmr = (struct mld2_report *)skb_transport_header(skb);
1722         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1723         *ppgr = pgr;
1724         return skb;
1725 }
1726
1727 #define AVAILABLE(skb)  ((skb) ? skb_availroom(skb) : 0)
1728
1729 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1730         int type, int gdeleted, int sdeleted, int crsend)
1731 {
1732         struct inet6_dev *idev = pmc->idev;
1733         struct net_device *dev = idev->dev;
1734         struct mld2_report *pmr;
1735         struct mld2_grec *pgr = NULL;
1736         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1737         int scount, stotal, first, isquery, truncate;
1738         unsigned int mtu;
1739
1740         if (pmc->mca_flags & MAF_NOREPORT)
1741                 return skb;
1742
1743         mtu = READ_ONCE(dev->mtu);
1744         if (mtu < IPV6_MIN_MTU)
1745                 return skb;
1746
1747         isquery = type == MLD2_MODE_IS_INCLUDE ||
1748                   type == MLD2_MODE_IS_EXCLUDE;
1749         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1750                     type == MLD2_CHANGE_TO_EXCLUDE;
1751
1752         stotal = scount = 0;
1753
1754         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1755
1756         if (!*psf_list)
1757                 goto empty_source;
1758
1759         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1760
1761         /* EX and TO_EX get a fresh packet, if needed */
1762         if (truncate) {
1763                 if (pmr && pmr->mld2r_ngrec &&
1764                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1765                         if (skb)
1766                                 mld_sendpack(skb);
1767                         skb = mld_newpack(idev, mtu);
1768                 }
1769         }
1770         first = 1;
1771         psf_prev = NULL;
1772         for (psf = *psf_list; psf; psf = psf_next) {
1773                 struct in6_addr *psrc;
1774
1775                 psf_next = psf->sf_next;
1776
1777                 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1778                         psf_prev = psf;
1779                         continue;
1780                 }
1781
1782                 /* Based on RFC3810 6.1. Should not send source-list change
1783                  * records when there is a filter mode change.
1784                  */
1785                 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1786                      (!gdeleted && pmc->mca_crcount)) &&
1787                     (type == MLD2_ALLOW_NEW_SOURCES ||
1788                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1789                         goto decrease_sf_crcount;
1790
1791                 /* clear marks on query responses */
1792                 if (isquery)
1793                         psf->sf_gsresp = 0;
1794
1795                 if (AVAILABLE(skb) < sizeof(*psrc) +
1796                     first*sizeof(struct mld2_grec)) {
1797                         if (truncate && !first)
1798                                 break;   /* truncate these */
1799                         if (pgr)
1800                                 pgr->grec_nsrcs = htons(scount);
1801                         if (skb)
1802                                 mld_sendpack(skb);
1803                         skb = mld_newpack(idev, mtu);
1804                         first = 1;
1805                         scount = 0;
1806                 }
1807                 if (first) {
1808                         skb = add_grhead(skb, pmc, type, &pgr, mtu);
1809                         first = 0;
1810                 }
1811                 if (!skb)
1812                         return NULL;
1813                 psrc = skb_put(skb, sizeof(*psrc));
1814                 *psrc = psf->sf_addr;
1815                 scount++; stotal++;
1816                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1817                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1818 decrease_sf_crcount:
1819                         psf->sf_crcount--;
1820                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1821                                 if (psf_prev)
1822                                         psf_prev->sf_next = psf->sf_next;
1823                                 else
1824                                         *psf_list = psf->sf_next;
1825                                 kfree(psf);
1826                                 continue;
1827                         }
1828                 }
1829                 psf_prev = psf;
1830         }
1831
1832 empty_source:
1833         if (!stotal) {
1834                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1835                     type == MLD2_BLOCK_OLD_SOURCES)
1836                         return skb;
1837                 if (pmc->mca_crcount || isquery || crsend) {
1838                         /* make sure we have room for group header */
1839                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1840                                 mld_sendpack(skb);
1841                                 skb = NULL; /* add_grhead will get a new one */
1842                         }
1843                         skb = add_grhead(skb, pmc, type, &pgr, mtu);
1844                 }
1845         }
1846         if (pgr)
1847                 pgr->grec_nsrcs = htons(scount);
1848
1849         if (isquery)
1850                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1851         return skb;
1852 }
1853
1854 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1855 {
1856         struct sk_buff *skb = NULL;
1857         int type;
1858
1859         read_lock_bh(&idev->lock);
1860         if (!pmc) {
1861                 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1862                         if (pmc->mca_flags & MAF_NOREPORT)
1863                                 continue;
1864                         spin_lock_bh(&pmc->mca_lock);
1865                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1866                                 type = MLD2_MODE_IS_EXCLUDE;
1867                         else
1868                                 type = MLD2_MODE_IS_INCLUDE;
1869                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1870                         spin_unlock_bh(&pmc->mca_lock);
1871                 }
1872         } else {
1873                 spin_lock_bh(&pmc->mca_lock);
1874                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1875                         type = MLD2_MODE_IS_EXCLUDE;
1876                 else
1877                         type = MLD2_MODE_IS_INCLUDE;
1878                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1879                 spin_unlock_bh(&pmc->mca_lock);
1880         }
1881         read_unlock_bh(&idev->lock);
1882         if (skb)
1883                 mld_sendpack(skb);
1884 }
1885
1886 /*
1887  * remove zero-count source records from a source filter list
1888  */
1889 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1890 {
1891         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1892
1893         psf_prev = NULL;
1894         for (psf = *ppsf; psf; psf = psf_next) {
1895                 psf_next = psf->sf_next;
1896                 if (psf->sf_crcount == 0) {
1897                         if (psf_prev)
1898                                 psf_prev->sf_next = psf->sf_next;
1899                         else
1900                                 *ppsf = psf->sf_next;
1901                         kfree(psf);
1902                 } else
1903                         psf_prev = psf;
1904         }
1905 }
1906
1907 static void mld_send_cr(struct inet6_dev *idev)
1908 {
1909         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1910         struct sk_buff *skb = NULL;
1911         int type, dtype;
1912
1913         read_lock_bh(&idev->lock);
1914         spin_lock(&idev->mc_lock);
1915
1916         /* deleted MCA's */
1917         pmc_prev = NULL;
1918         for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1919                 pmc_next = pmc->next;
1920                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1921                         type = MLD2_BLOCK_OLD_SOURCES;
1922                         dtype = MLD2_BLOCK_OLD_SOURCES;
1923                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1924                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1925                 }
1926                 if (pmc->mca_crcount) {
1927                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1928                                 type = MLD2_CHANGE_TO_INCLUDE;
1929                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1930                         }
1931                         pmc->mca_crcount--;
1932                         if (pmc->mca_crcount == 0) {
1933                                 mld_clear_zeros(&pmc->mca_tomb);
1934                                 mld_clear_zeros(&pmc->mca_sources);
1935                         }
1936                 }
1937                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1938                     !pmc->mca_sources) {
1939                         if (pmc_prev)
1940                                 pmc_prev->next = pmc_next;
1941                         else
1942                                 idev->mc_tomb = pmc_next;
1943                         in6_dev_put(pmc->idev);
1944                         kfree(pmc);
1945                 } else
1946                         pmc_prev = pmc;
1947         }
1948         spin_unlock(&idev->mc_lock);
1949
1950         /* change recs */
1951         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1952                 spin_lock_bh(&pmc->mca_lock);
1953                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1954                         type = MLD2_BLOCK_OLD_SOURCES;
1955                         dtype = MLD2_ALLOW_NEW_SOURCES;
1956                 } else {
1957                         type = MLD2_ALLOW_NEW_SOURCES;
1958                         dtype = MLD2_BLOCK_OLD_SOURCES;
1959                 }
1960                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1961                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1962
1963                 /* filter mode changes */
1964                 if (pmc->mca_crcount) {
1965                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1966                                 type = MLD2_CHANGE_TO_EXCLUDE;
1967                         else
1968                                 type = MLD2_CHANGE_TO_INCLUDE;
1969                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1970                         pmc->mca_crcount--;
1971                 }
1972                 spin_unlock_bh(&pmc->mca_lock);
1973         }
1974         read_unlock_bh(&idev->lock);
1975         if (!skb)
1976                 return;
1977         (void) mld_sendpack(skb);
1978 }
1979
1980 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1981 {
1982         struct net *net = dev_net(dev);
1983         struct sock *sk = net->ipv6.igmp_sk;
1984         struct inet6_dev *idev;
1985         struct sk_buff *skb;
1986         struct mld_msg *hdr;
1987         const struct in6_addr *snd_addr, *saddr;
1988         struct in6_addr addr_buf;
1989         int hlen = LL_RESERVED_SPACE(dev);
1990         int tlen = dev->needed_tailroom;
1991         int err, len, payload_len, full_len;
1992         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1993                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1994                      IPV6_TLV_PADN, 0 };
1995         struct flowi6 fl6;
1996         struct dst_entry *dst;
1997
1998         if (type == ICMPV6_MGM_REDUCTION)
1999                 snd_addr = &in6addr_linklocal_allrouters;
2000         else
2001                 snd_addr = addr;
2002
2003         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2004         payload_len = len + sizeof(ra);
2005         full_len = sizeof(struct ipv6hdr) + payload_len;
2006
2007         rcu_read_lock();
2008         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2009                       IPSTATS_MIB_OUT, full_len);
2010         rcu_read_unlock();
2011
2012         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2013
2014         if (!skb) {
2015                 rcu_read_lock();
2016                 IP6_INC_STATS(net, __in6_dev_get(dev),
2017                               IPSTATS_MIB_OUTDISCARDS);
2018                 rcu_read_unlock();
2019                 return;
2020         }
2021         skb->priority = TC_PRIO_CONTROL;
2022         skb_reserve(skb, hlen);
2023
2024         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2025                 /* <draft-ietf-magma-mld-source-05.txt>:
2026                  * use unspecified address as the source address
2027                  * when a valid link-local address is not available.
2028                  */
2029                 saddr = &in6addr_any;
2030         } else
2031                 saddr = &addr_buf;
2032
2033         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2034
2035         skb_put_data(skb, ra, sizeof(ra));
2036
2037         hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2038         hdr->mld_type = type;
2039         hdr->mld_mca = *addr;
2040
2041         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2042                                          IPPROTO_ICMPV6,
2043                                          csum_partial(hdr, len, 0));
2044
2045         rcu_read_lock();
2046         idev = __in6_dev_get(skb->dev);
2047
2048         icmpv6_flow_init(sk, &fl6, type,
2049                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2050                          skb->dev->ifindex);
2051         dst = icmp6_dst_alloc(skb->dev, &fl6);
2052         if (IS_ERR(dst)) {
2053                 err = PTR_ERR(dst);
2054                 goto err_out;
2055         }
2056
2057         skb_dst_set(skb, dst);
2058         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2059                       net, sk, skb, NULL, skb->dev,
2060                       dst_output);
2061 out:
2062         if (!err) {
2063                 ICMP6MSGOUT_INC_STATS(net, idev, type);
2064                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2065         } else
2066                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2067
2068         rcu_read_unlock();
2069         return;
2070
2071 err_out:
2072         kfree_skb(skb);
2073         goto out;
2074 }
2075
2076 static void mld_send_initial_cr(struct inet6_dev *idev)
2077 {
2078         struct sk_buff *skb;
2079         struct ifmcaddr6 *pmc;
2080         int type;
2081
2082         if (mld_in_v1_mode(idev))
2083                 return;
2084
2085         skb = NULL;
2086         read_lock_bh(&idev->lock);
2087         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2088                 spin_lock_bh(&pmc->mca_lock);
2089                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2090                         type = MLD2_CHANGE_TO_EXCLUDE;
2091                 else
2092                         type = MLD2_ALLOW_NEW_SOURCES;
2093                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2094                 spin_unlock_bh(&pmc->mca_lock);
2095         }
2096         read_unlock_bh(&idev->lock);
2097         if (skb)
2098                 mld_sendpack(skb);
2099 }
2100
2101 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2102 {
2103         idev->mc_dad_count = idev->mc_qrv;
2104         if (idev->mc_dad_count) {
2105                 mld_send_initial_cr(idev);
2106                 idev->mc_dad_count--;
2107                 if (idev->mc_dad_count)
2108                         mld_dad_start_timer(idev,
2109                                             unsolicited_report_interval(idev));
2110         }
2111 }
2112
2113 static void mld_dad_timer_expire(struct timer_list *t)
2114 {
2115         struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
2116
2117         mld_send_initial_cr(idev);
2118         if (idev->mc_dad_count) {
2119                 idev->mc_dad_count--;
2120                 if (idev->mc_dad_count)
2121                         mld_dad_start_timer(idev,
2122                                             unsolicited_report_interval(idev));
2123         }
2124         in6_dev_put(idev);
2125 }
2126
2127 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2128         const struct in6_addr *psfsrc)
2129 {
2130         struct ip6_sf_list *psf, *psf_prev;
2131         int rv = 0;
2132
2133         psf_prev = NULL;
2134         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2135                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2136                         break;
2137                 psf_prev = psf;
2138         }
2139         if (!psf || psf->sf_count[sfmode] == 0) {
2140                 /* source filter not found, or count wrong =>  bug */
2141                 return -ESRCH;
2142         }
2143         psf->sf_count[sfmode]--;
2144         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2145                 struct inet6_dev *idev = pmc->idev;
2146
2147                 /* no more filters for this source */
2148                 if (psf_prev)
2149                         psf_prev->sf_next = psf->sf_next;
2150                 else
2151                         pmc->mca_sources = psf->sf_next;
2152                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2153                     !mld_in_v1_mode(idev)) {
2154                         psf->sf_crcount = idev->mc_qrv;
2155                         psf->sf_next = pmc->mca_tomb;
2156                         pmc->mca_tomb = psf;
2157                         rv = 1;
2158                 } else
2159                         kfree(psf);
2160         }
2161         return rv;
2162 }
2163
2164 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2165                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2166                           int delta)
2167 {
2168         struct ifmcaddr6 *pmc;
2169         int     changerec = 0;
2170         int     i, err;
2171
2172         if (!idev)
2173                 return -ENODEV;
2174         read_lock_bh(&idev->lock);
2175         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2176                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2177                         break;
2178         }
2179         if (!pmc) {
2180                 /* MCA not found?? bug */
2181                 read_unlock_bh(&idev->lock);
2182                 return -ESRCH;
2183         }
2184         spin_lock_bh(&pmc->mca_lock);
2185         sf_markstate(pmc);
2186         if (!delta) {
2187                 if (!pmc->mca_sfcount[sfmode]) {
2188                         spin_unlock_bh(&pmc->mca_lock);
2189                         read_unlock_bh(&idev->lock);
2190                         return -EINVAL;
2191                 }
2192                 pmc->mca_sfcount[sfmode]--;
2193         }
2194         err = 0;
2195         for (i = 0; i < sfcount; i++) {
2196                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2197
2198                 changerec |= rv > 0;
2199                 if (!err && rv < 0)
2200                         err = rv;
2201         }
2202         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2203             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2204             pmc->mca_sfcount[MCAST_INCLUDE]) {
2205                 struct ip6_sf_list *psf;
2206
2207                 /* filter mode change */
2208                 pmc->mca_sfmode = MCAST_INCLUDE;
2209                 pmc->mca_crcount = idev->mc_qrv;
2210                 idev->mc_ifc_count = pmc->mca_crcount;
2211                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2212                         psf->sf_crcount = 0;
2213                 mld_ifc_event(pmc->idev);
2214         } else if (sf_setstate(pmc) || changerec)
2215                 mld_ifc_event(pmc->idev);
2216         spin_unlock_bh(&pmc->mca_lock);
2217         read_unlock_bh(&idev->lock);
2218         return err;
2219 }
2220
2221 /*
2222  * Add multicast single-source filter to the interface list
2223  */
2224 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2225         const struct in6_addr *psfsrc)
2226 {
2227         struct ip6_sf_list *psf, *psf_prev;
2228
2229         psf_prev = NULL;
2230         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2231                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2232                         break;
2233                 psf_prev = psf;
2234         }
2235         if (!psf) {
2236                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2237                 if (!psf)
2238                         return -ENOBUFS;
2239
2240                 psf->sf_addr = *psfsrc;
2241                 if (psf_prev) {
2242                         psf_prev->sf_next = psf;
2243                 } else
2244                         pmc->mca_sources = psf;
2245         }
2246         psf->sf_count[sfmode]++;
2247         return 0;
2248 }
2249
2250 static void sf_markstate(struct ifmcaddr6 *pmc)
2251 {
2252         struct ip6_sf_list *psf;
2253         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2254
2255         for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2256                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2257                         psf->sf_oldin = mca_xcount ==
2258                                 psf->sf_count[MCAST_EXCLUDE] &&
2259                                 !psf->sf_count[MCAST_INCLUDE];
2260                 } else
2261                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2262 }
2263
2264 static int sf_setstate(struct ifmcaddr6 *pmc)
2265 {
2266         struct ip6_sf_list *psf, *dpsf;
2267         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2268         int qrv = pmc->idev->mc_qrv;
2269         int new_in, rv;
2270
2271         rv = 0;
2272         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2273                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2274                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2275                                 !psf->sf_count[MCAST_INCLUDE];
2276                 } else
2277                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2278                 if (new_in) {
2279                         if (!psf->sf_oldin) {
2280                                 struct ip6_sf_list *prev = NULL;
2281
2282                                 for (dpsf = pmc->mca_tomb; dpsf;
2283                                      dpsf = dpsf->sf_next) {
2284                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2285                                             &psf->sf_addr))
2286                                                 break;
2287                                         prev = dpsf;
2288                                 }
2289                                 if (dpsf) {
2290                                         if (prev)
2291                                                 prev->sf_next = dpsf->sf_next;
2292                                         else
2293                                                 pmc->mca_tomb = dpsf->sf_next;
2294                                         kfree(dpsf);
2295                                 }
2296                                 psf->sf_crcount = qrv;
2297                                 rv++;
2298                         }
2299                 } else if (psf->sf_oldin) {
2300                         psf->sf_crcount = 0;
2301                         /*
2302                          * add or update "delete" records if an active filter
2303                          * is now inactive
2304                          */
2305                         for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2306                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2307                                     &psf->sf_addr))
2308                                         break;
2309                         if (!dpsf) {
2310                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2311                                 if (!dpsf)
2312                                         continue;
2313                                 *dpsf = *psf;
2314                                 /* pmc->mca_lock held by callers */
2315                                 dpsf->sf_next = pmc->mca_tomb;
2316                                 pmc->mca_tomb = dpsf;
2317                         }
2318                         dpsf->sf_crcount = qrv;
2319                         rv++;
2320                 }
2321         }
2322         return rv;
2323 }
2324
2325 /*
2326  * Add multicast source filter list to the interface list
2327  */
2328 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2329                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2330                           int delta)
2331 {
2332         struct ifmcaddr6 *pmc;
2333         int     isexclude;
2334         int     i, err;
2335
2336         if (!idev)
2337                 return -ENODEV;
2338         read_lock_bh(&idev->lock);
2339         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2340                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2341                         break;
2342         }
2343         if (!pmc) {
2344                 /* MCA not found?? bug */
2345                 read_unlock_bh(&idev->lock);
2346                 return -ESRCH;
2347         }
2348         spin_lock_bh(&pmc->mca_lock);
2349
2350         sf_markstate(pmc);
2351         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2352         if (!delta)
2353                 pmc->mca_sfcount[sfmode]++;
2354         err = 0;
2355         for (i = 0; i < sfcount; i++) {
2356                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2357                 if (err)
2358                         break;
2359         }
2360         if (err) {
2361                 int j;
2362
2363                 if (!delta)
2364                         pmc->mca_sfcount[sfmode]--;
2365                 for (j = 0; j < i; j++)
2366                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2367         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2368                 struct ip6_sf_list *psf;
2369
2370                 /* filter mode change */
2371                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2372                         pmc->mca_sfmode = MCAST_EXCLUDE;
2373                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2374                         pmc->mca_sfmode = MCAST_INCLUDE;
2375                 /* else no filters; keep old mode for reports */
2376
2377                 pmc->mca_crcount = idev->mc_qrv;
2378                 idev->mc_ifc_count = pmc->mca_crcount;
2379                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2380                         psf->sf_crcount = 0;
2381                 mld_ifc_event(idev);
2382         } else if (sf_setstate(pmc))
2383                 mld_ifc_event(idev);
2384         spin_unlock_bh(&pmc->mca_lock);
2385         read_unlock_bh(&idev->lock);
2386         return err;
2387 }
2388
2389 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2390 {
2391         struct ip6_sf_list *psf, *nextpsf;
2392
2393         for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2394                 nextpsf = psf->sf_next;
2395                 kfree(psf);
2396         }
2397         pmc->mca_tomb = NULL;
2398         for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2399                 nextpsf = psf->sf_next;
2400                 kfree(psf);
2401         }
2402         pmc->mca_sources = NULL;
2403         pmc->mca_sfmode = MCAST_EXCLUDE;
2404         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2405         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2406 }
2407
2408
2409 static void igmp6_join_group(struct ifmcaddr6 *ma)
2410 {
2411         unsigned long delay;
2412
2413         if (ma->mca_flags & MAF_NOREPORT)
2414                 return;
2415
2416         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2417
2418         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2419
2420         spin_lock_bh(&ma->mca_lock);
2421         if (del_timer(&ma->mca_timer)) {
2422                 refcount_dec(&ma->mca_refcnt);
2423                 delay = ma->mca_timer.expires - jiffies;
2424         }
2425
2426         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2427                 refcount_inc(&ma->mca_refcnt);
2428         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2429         spin_unlock_bh(&ma->mca_lock);
2430 }
2431
2432 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2433                             struct inet6_dev *idev)
2434 {
2435         int err;
2436
2437         write_lock_bh(&iml->sflock);
2438         if (!iml->sflist) {
2439                 /* any-source empty exclude case */
2440                 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2441         } else {
2442                 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2443                                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2444                 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2445                 iml->sflist = NULL;
2446         }
2447         write_unlock_bh(&iml->sflock);
2448         return err;
2449 }
2450
2451 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2452 {
2453         if (mld_in_v1_mode(ma->idev)) {
2454                 if (ma->mca_flags & MAF_LAST_REPORTER)
2455                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2456                                 ICMPV6_MGM_REDUCTION);
2457         } else {
2458                 mld_add_delrec(ma->idev, ma);
2459                 mld_ifc_event(ma->idev);
2460         }
2461 }
2462
2463 static void mld_gq_timer_expire(struct timer_list *t)
2464 {
2465         struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
2466
2467         idev->mc_gq_running = 0;
2468         mld_send_report(idev, NULL);
2469         in6_dev_put(idev);
2470 }
2471
2472 static void mld_ifc_timer_expire(struct timer_list *t)
2473 {
2474         struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
2475
2476         mld_send_cr(idev);
2477         if (idev->mc_ifc_count) {
2478                 idev->mc_ifc_count--;
2479                 if (idev->mc_ifc_count)
2480                         mld_ifc_start_timer(idev,
2481                                             unsolicited_report_interval(idev));
2482         }
2483         in6_dev_put(idev);
2484 }
2485
2486 static void mld_ifc_event(struct inet6_dev *idev)
2487 {
2488         if (mld_in_v1_mode(idev))
2489                 return;
2490         idev->mc_ifc_count = idev->mc_qrv;
2491         mld_ifc_start_timer(idev, 1);
2492 }
2493
2494 static void igmp6_timer_handler(struct timer_list *t)
2495 {
2496         struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
2497
2498         if (mld_in_v1_mode(ma->idev))
2499                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2500         else
2501                 mld_send_report(ma->idev, ma);
2502
2503         spin_lock(&ma->mca_lock);
2504         ma->mca_flags |=  MAF_LAST_REPORTER;
2505         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2506         spin_unlock(&ma->mca_lock);
2507         ma_put(ma);
2508 }
2509
2510 /* Device changing type */
2511
2512 void ipv6_mc_unmap(struct inet6_dev *idev)
2513 {
2514         struct ifmcaddr6 *i;
2515
2516         /* Install multicast list, except for all-nodes (already installed) */
2517
2518         read_lock_bh(&idev->lock);
2519         for (i = idev->mc_list; i; i = i->next)
2520                 igmp6_group_dropped(i);
2521         read_unlock_bh(&idev->lock);
2522 }
2523
2524 void ipv6_mc_remap(struct inet6_dev *idev)
2525 {
2526         ipv6_mc_up(idev);
2527 }
2528
2529 /* Device going down */
2530
2531 void ipv6_mc_down(struct inet6_dev *idev)
2532 {
2533         struct ifmcaddr6 *i;
2534
2535         /* Withdraw multicast list */
2536
2537         read_lock_bh(&idev->lock);
2538
2539         for (i = idev->mc_list; i; i = i->next)
2540                 igmp6_group_dropped(i);
2541
2542         /* Should stop timer after group drop. or we will
2543          * start timer again in mld_ifc_event()
2544          */
2545         mld_ifc_stop_timer(idev);
2546         mld_gq_stop_timer(idev);
2547         mld_dad_stop_timer(idev);
2548         read_unlock_bh(&idev->lock);
2549 }
2550
2551 static void ipv6_mc_reset(struct inet6_dev *idev)
2552 {
2553         idev->mc_qrv = sysctl_mld_qrv;
2554         idev->mc_qi = MLD_QI_DEFAULT;
2555         idev->mc_qri = MLD_QRI_DEFAULT;
2556         idev->mc_v1_seen = 0;
2557         idev->mc_maxdelay = unsolicited_report_interval(idev);
2558 }
2559
2560 /* Device going up */
2561
2562 void ipv6_mc_up(struct inet6_dev *idev)
2563 {
2564         struct ifmcaddr6 *i;
2565
2566         /* Install multicast list, except for all-nodes (already installed) */
2567
2568         read_lock_bh(&idev->lock);
2569         ipv6_mc_reset(idev);
2570         for (i = idev->mc_list; i; i = i->next) {
2571                 mld_del_delrec(idev, i);
2572                 igmp6_group_added(i);
2573         }
2574         read_unlock_bh(&idev->lock);
2575 }
2576
2577 /* IPv6 device initialization. */
2578
2579 void ipv6_mc_init_dev(struct inet6_dev *idev)
2580 {
2581         write_lock_bh(&idev->lock);
2582         spin_lock_init(&idev->mc_lock);
2583         idev->mc_gq_running = 0;
2584         timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
2585         idev->mc_tomb = NULL;
2586         idev->mc_ifc_count = 0;
2587         timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
2588         timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
2589         ipv6_mc_reset(idev);
2590         write_unlock_bh(&idev->lock);
2591 }
2592
2593 /*
2594  *      Device is about to be destroyed: clean up.
2595  */
2596
2597 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2598 {
2599         struct ifmcaddr6 *i;
2600
2601         /* Deactivate timers */
2602         ipv6_mc_down(idev);
2603         mld_clear_delrec(idev);
2604
2605         /* Delete all-nodes address. */
2606         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2607          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2608          * fail.
2609          */
2610         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2611
2612         if (idev->cnf.forwarding)
2613                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2614
2615         write_lock_bh(&idev->lock);
2616         while ((i = idev->mc_list) != NULL) {
2617                 idev->mc_list = i->next;
2618
2619                 write_unlock_bh(&idev->lock);
2620                 ma_put(i);
2621                 write_lock_bh(&idev->lock);
2622         }
2623         write_unlock_bh(&idev->lock);
2624 }
2625
2626 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2627 {
2628         struct ifmcaddr6 *pmc;
2629
2630         ASSERT_RTNL();
2631
2632         if (mld_in_v1_mode(idev)) {
2633                 read_lock_bh(&idev->lock);
2634                 for (pmc = idev->mc_list; pmc; pmc = pmc->next)
2635                         igmp6_join_group(pmc);
2636                 read_unlock_bh(&idev->lock);
2637         } else
2638                 mld_send_report(idev, NULL);
2639 }
2640
2641 static int ipv6_mc_netdev_event(struct notifier_block *this,
2642                                 unsigned long event,
2643                                 void *ptr)
2644 {
2645         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2646         struct inet6_dev *idev = __in6_dev_get(dev);
2647
2648         switch (event) {
2649         case NETDEV_RESEND_IGMP:
2650                 if (idev)
2651                         ipv6_mc_rejoin_groups(idev);
2652                 break;
2653         default:
2654                 break;
2655         }
2656
2657         return NOTIFY_DONE;
2658 }
2659
2660 static struct notifier_block igmp6_netdev_notifier = {
2661         .notifier_call = ipv6_mc_netdev_event,
2662 };
2663
2664 #ifdef CONFIG_PROC_FS
2665 struct igmp6_mc_iter_state {
2666         struct seq_net_private p;
2667         struct net_device *dev;
2668         struct inet6_dev *idev;
2669 };
2670
2671 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2672
2673 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2674 {
2675         struct ifmcaddr6 *im = NULL;
2676         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2677         struct net *net = seq_file_net(seq);
2678
2679         state->idev = NULL;
2680         for_each_netdev_rcu(net, state->dev) {
2681                 struct inet6_dev *idev;
2682                 idev = __in6_dev_get(state->dev);
2683                 if (!idev)
2684                         continue;
2685                 read_lock_bh(&idev->lock);
2686                 im = idev->mc_list;
2687                 if (im) {
2688                         state->idev = idev;
2689                         break;
2690                 }
2691                 read_unlock_bh(&idev->lock);
2692         }
2693         return im;
2694 }
2695
2696 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2697 {
2698         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2699
2700         im = im->next;
2701         while (!im) {
2702                 if (likely(state->idev))
2703                         read_unlock_bh(&state->idev->lock);
2704
2705                 state->dev = next_net_device_rcu(state->dev);
2706                 if (!state->dev) {
2707                         state->idev = NULL;
2708                         break;
2709                 }
2710                 state->idev = __in6_dev_get(state->dev);
2711                 if (!state->idev)
2712                         continue;
2713                 read_lock_bh(&state->idev->lock);
2714                 im = state->idev->mc_list;
2715         }
2716         return im;
2717 }
2718
2719 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2720 {
2721         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2722         if (im)
2723                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2724                         --pos;
2725         return pos ? NULL : im;
2726 }
2727
2728 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2729         __acquires(RCU)
2730 {
2731         rcu_read_lock();
2732         return igmp6_mc_get_idx(seq, *pos);
2733 }
2734
2735 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2736 {
2737         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2738
2739         ++*pos;
2740         return im;
2741 }
2742
2743 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2744         __releases(RCU)
2745 {
2746         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2747
2748         if (likely(state->idev)) {
2749                 read_unlock_bh(&state->idev->lock);
2750                 state->idev = NULL;
2751         }
2752         state->dev = NULL;
2753         rcu_read_unlock();
2754 }
2755
2756 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2757 {
2758         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2759         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2760
2761         seq_printf(seq,
2762                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2763                    state->dev->ifindex, state->dev->name,
2764                    &im->mca_addr,
2765                    im->mca_users, im->mca_flags,
2766                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2767                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2768         return 0;
2769 }
2770
2771 static const struct seq_operations igmp6_mc_seq_ops = {
2772         .start  =       igmp6_mc_seq_start,
2773         .next   =       igmp6_mc_seq_next,
2774         .stop   =       igmp6_mc_seq_stop,
2775         .show   =       igmp6_mc_seq_show,
2776 };
2777
2778 struct igmp6_mcf_iter_state {
2779         struct seq_net_private p;
2780         struct net_device *dev;
2781         struct inet6_dev *idev;
2782         struct ifmcaddr6 *im;
2783 };
2784
2785 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2786
2787 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2788 {
2789         struct ip6_sf_list *psf = NULL;
2790         struct ifmcaddr6 *im = NULL;
2791         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2792         struct net *net = seq_file_net(seq);
2793
2794         state->idev = NULL;
2795         state->im = NULL;
2796         for_each_netdev_rcu(net, state->dev) {
2797                 struct inet6_dev *idev;
2798                 idev = __in6_dev_get(state->dev);
2799                 if (unlikely(idev == NULL))
2800                         continue;
2801                 read_lock_bh(&idev->lock);
2802                 im = idev->mc_list;
2803                 if (likely(im)) {
2804                         spin_lock_bh(&im->mca_lock);
2805                         psf = im->mca_sources;
2806                         if (likely(psf)) {
2807                                 state->im = im;
2808                                 state->idev = idev;
2809                                 break;
2810                         }
2811                         spin_unlock_bh(&im->mca_lock);
2812                 }
2813                 read_unlock_bh(&idev->lock);
2814         }
2815         return psf;
2816 }
2817
2818 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2819 {
2820         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2821
2822         psf = psf->sf_next;
2823         while (!psf) {
2824                 spin_unlock_bh(&state->im->mca_lock);
2825                 state->im = state->im->next;
2826                 while (!state->im) {
2827                         if (likely(state->idev))
2828                                 read_unlock_bh(&state->idev->lock);
2829
2830                         state->dev = next_net_device_rcu(state->dev);
2831                         if (!state->dev) {
2832                                 state->idev = NULL;
2833                                 goto out;
2834                         }
2835                         state->idev = __in6_dev_get(state->dev);
2836                         if (!state->idev)
2837                                 continue;
2838                         read_lock_bh(&state->idev->lock);
2839                         state->im = state->idev->mc_list;
2840                 }
2841                 if (!state->im)
2842                         break;
2843                 spin_lock_bh(&state->im->mca_lock);
2844                 psf = state->im->mca_sources;
2845         }
2846 out:
2847         return psf;
2848 }
2849
2850 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2851 {
2852         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2853         if (psf)
2854                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2855                         --pos;
2856         return pos ? NULL : psf;
2857 }
2858
2859 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2860         __acquires(RCU)
2861 {
2862         rcu_read_lock();
2863         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2864 }
2865
2866 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2867 {
2868         struct ip6_sf_list *psf;
2869         if (v == SEQ_START_TOKEN)
2870                 psf = igmp6_mcf_get_first(seq);
2871         else
2872                 psf = igmp6_mcf_get_next(seq, v);
2873         ++*pos;
2874         return psf;
2875 }
2876
2877 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2878         __releases(RCU)
2879 {
2880         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2881         if (likely(state->im)) {
2882                 spin_unlock_bh(&state->im->mca_lock);
2883                 state->im = NULL;
2884         }
2885         if (likely(state->idev)) {
2886                 read_unlock_bh(&state->idev->lock);
2887                 state->idev = NULL;
2888         }
2889         state->dev = NULL;
2890         rcu_read_unlock();
2891 }
2892
2893 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2894 {
2895         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2896         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2897
2898         if (v == SEQ_START_TOKEN) {
2899                 seq_puts(seq, "Idx Device                Multicast Address                   Source Address    INC    EXC\n");
2900         } else {
2901                 seq_printf(seq,
2902                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2903                            state->dev->ifindex, state->dev->name,
2904                            &state->im->mca_addr,
2905                            &psf->sf_addr,
2906                            psf->sf_count[MCAST_INCLUDE],
2907                            psf->sf_count[MCAST_EXCLUDE]);
2908         }
2909         return 0;
2910 }
2911
2912 static const struct seq_operations igmp6_mcf_seq_ops = {
2913         .start  =       igmp6_mcf_seq_start,
2914         .next   =       igmp6_mcf_seq_next,
2915         .stop   =       igmp6_mcf_seq_stop,
2916         .show   =       igmp6_mcf_seq_show,
2917 };
2918
2919 static int __net_init igmp6_proc_init(struct net *net)
2920 {
2921         int err;
2922
2923         err = -ENOMEM;
2924         if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
2925                         sizeof(struct igmp6_mc_iter_state)))
2926                 goto out;
2927         if (!proc_create_net("mcfilter6", 0444, net->proc_net,
2928                         &igmp6_mcf_seq_ops,
2929                         sizeof(struct igmp6_mcf_iter_state)))
2930                 goto out_proc_net_igmp6;
2931
2932         err = 0;
2933 out:
2934         return err;
2935
2936 out_proc_net_igmp6:
2937         remove_proc_entry("igmp6", net->proc_net);
2938         goto out;
2939 }
2940
2941 static void __net_exit igmp6_proc_exit(struct net *net)
2942 {
2943         remove_proc_entry("mcfilter6", net->proc_net);
2944         remove_proc_entry("igmp6", net->proc_net);
2945 }
2946 #else
2947 static inline int igmp6_proc_init(struct net *net)
2948 {
2949         return 0;
2950 }
2951 static inline void igmp6_proc_exit(struct net *net)
2952 {
2953 }
2954 #endif
2955
2956 static int __net_init igmp6_net_init(struct net *net)
2957 {
2958         int err;
2959
2960         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2961                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2962         if (err < 0) {
2963                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2964                        err);
2965                 goto out;
2966         }
2967
2968         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2969
2970         err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2971                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2972         if (err < 0) {
2973                 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2974                        err);
2975                 goto out_sock_create;
2976         }
2977
2978         err = igmp6_proc_init(net);
2979         if (err)
2980                 goto out_sock_create_autojoin;
2981
2982         return 0;
2983
2984 out_sock_create_autojoin:
2985         inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2986 out_sock_create:
2987         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2988 out:
2989         return err;
2990 }
2991
2992 static void __net_exit igmp6_net_exit(struct net *net)
2993 {
2994         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2995         inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2996         igmp6_proc_exit(net);
2997 }
2998
2999 static struct pernet_operations igmp6_net_ops = {
3000         .init = igmp6_net_init,
3001         .exit = igmp6_net_exit,
3002 };
3003
3004 int __init igmp6_init(void)
3005 {
3006         return register_pernet_subsys(&igmp6_net_ops);
3007 }
3008
3009 int __init igmp6_late_init(void)
3010 {
3011         return register_netdevice_notifier(&igmp6_netdev_notifier);
3012 }
3013
3014 void igmp6_cleanup(void)
3015 {
3016         unregister_pernet_subsys(&igmp6_net_ops);
3017 }
3018
3019 void igmp6_late_cleanup(void)
3020 {
3021         unregister_netdevice_notifier(&igmp6_netdev_notifier);
3022 }