net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <linux/pkt_sched.h>
  48 #include <net/mld.h>
  49
  50 #include <linux/netfilter.h>
  51 #include <linux/netfilter_ipv6.h>
  52
  53 #include <net/net_namespace.h>
  54 #include <net/sock.h>
  55 #include <net/snmp.h>
  56
  57 #include <net/ipv6.h>
  58 #include <net/protocol.h>
  59 #include <net/if_inet6.h>
  60 #include <net/ndisc.h>
  61 #include <net/addrconf.h>
  62 #include <net/ip6_route.h>
  63 #include <net/inet_common.h>
  64
  65 #include <net/ip6_checksum.h>
  66
  67 /* Set to 3 to get tracing... */
  68 #define MCAST_DEBUG 2
  69
  70 #if MCAST_DEBUG >= 3
  71 #define MDBG(x) printk x
  72 #else
  73 #define MDBG(x)
  74 #endif
  75
  76 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  77 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  80         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  81 };
  82
  83 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  84
  85 /* Big mc list lock for all the sockets */
  86 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  87
  88 static void igmp6_join_group(struct ifmcaddr6 *ma);
  89 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  90 static void igmp6_timer_handler(unsigned long data);
  91
  92 static void mld_gq_timer_expire(unsigned long data);
  93 static void mld_ifc_timer_expire(unsigned long data);
  94 static void mld_ifc_event(struct inet6_dev *idev);
  95 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  96 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  97 static void mld_clear_delrec(struct inet6_dev *idev);
  98 static bool mld_in_v1_mode(const struct inet6_dev *idev);
  99 static int sf_setstate(struct ifmcaddr6 *pmc);
 100 static void sf_markstate(struct ifmcaddr6 *pmc);
 101 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 102 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 103                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 104                           int delta);
 105 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 106                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 107                           int delta);
 108 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 109                             struct inet6_dev *idev);
 110
 111 #define MLD_QRV_DEFAULT         2
 112 /* RFC3810, 9.2. Query Interval */
 113 #define MLD_QI_DEFAULT          (125 * HZ)
 114 /* RFC3810, 9.3. Query Response Interval */
 115 #define MLD_QRI_DEFAULT         (10 * HZ)
 116
 117 /* RFC3810, 8.1 Query Version Distinctions */
 118 #define MLD_V1_QUERY_LEN        24
 119 #define MLD_V2_QUERY_LEN_MIN    28
 120
 121 #define IPV6_MLD_MAX_MSF        64
 122
 123 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 124
 125 /*
 126  *      socket join on multicast group
 127  */
 128
 129 #define for_each_pmc_rcu(np, pmc)                               \
 130         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 131              pmc != NULL;                                       \
 132              pmc = rcu_dereference(pmc->next))
 133
 134 static int unsolicited_report_interval(struct inet6_dev *idev)
 135 {
 136         int iv;
 137
 138         if (mld_in_v1_mode(idev))
 139                 iv = idev->cnf.mldv1_unsolicited_report_interval;
 140         else
 141                 iv = idev->cnf.mldv2_unsolicited_report_interval;
 142
 143         return iv > 0 ? iv : 1;
 144 }
 145
 146 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 147 {
 148         struct net_device *dev = NULL;
 149         struct ipv6_mc_socklist *mc_lst;
 150         struct ipv6_pinfo *np = inet6_sk(sk);
 151         struct net *net = sock_net(sk);
 152         int err;
 153
 154         if (!ipv6_addr_is_multicast(addr))
 155                 return -EINVAL;
 156
 157         rcu_read_lock();
 158         for_each_pmc_rcu(np, mc_lst) {
 159                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 160                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 161                         rcu_read_unlock();
 162                         return -EADDRINUSE;
 163                 }
 164         }
 165         rcu_read_unlock();
 166
 167         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 168
 169         if (mc_lst == NULL)
 170                 return -ENOMEM;
 171
 172         mc_lst->next = NULL;
 173         mc_lst->addr = *addr;
 174
 175         rtnl_lock();
 176         rcu_read_lock();
 177         if (ifindex == 0) {
 178                 struct rt6_info *rt;
 179                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 180                 if (rt) {
 181                         dev = rt->dst.dev;
 182                         ip6_rt_put(rt);
 183                 }
 184         } else
 185                 dev = dev_get_by_index_rcu(net, ifindex);
 186
 187         if (dev == NULL) {
 188                 rcu_read_unlock();
 189                 rtnl_unlock();
 190                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 191                 return -ENODEV;
 192         }
 193
 194         mc_lst->ifindex = dev->ifindex;
 195         mc_lst->sfmode = MCAST_EXCLUDE;
 196         rwlock_init(&mc_lst->sflock);
 197         mc_lst->sflist = NULL;
 198
 199         /*
 200          *      now add/increase the group membership on the device
 201          */
 202
 203         err = ipv6_dev_mc_inc(dev, addr);
 204
 205         if (err) {
 206                 rcu_read_unlock();
 207                 rtnl_unlock();
 208                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 209                 return err;
 210         }
 211
 212         spin_lock(&ipv6_sk_mc_lock);
 213         mc_lst->next = np->ipv6_mc_list;
 214         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 215         spin_unlock(&ipv6_sk_mc_lock);
 216
 217         rcu_read_unlock();
 218         rtnl_unlock();
 219
 220         return 0;
 221 }
 222
 223 /*
 224  *      socket leave on multicast group
 225  */
 226 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 227 {
 228         struct ipv6_pinfo *np = inet6_sk(sk);
 229         struct ipv6_mc_socklist *mc_lst;
 230         struct ipv6_mc_socklist __rcu **lnk;
 231         struct net *net = sock_net(sk);
 232
 233         if (!ipv6_addr_is_multicast(addr))
 234                 return -EINVAL;
 235
 236         rtnl_lock();
 237         spin_lock(&ipv6_sk_mc_lock);
 238         for (lnk = &np->ipv6_mc_list;
 239              (mc_lst = rcu_dereference_protected(*lnk,
 240                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 241               lnk = &mc_lst->next) {
 242                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 243                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 244                         struct net_device *dev;
 245
 246                         *lnk = mc_lst->next;
 247                         spin_unlock(&ipv6_sk_mc_lock);
 248
 249                         rcu_read_lock();
 250                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 251                         if (dev != NULL) {
 252                                 struct inet6_dev *idev = __in6_dev_get(dev);
 253
 254                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 255                                 if (idev)
 256                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 257                         } else
 258                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 259                         rcu_read_unlock();
 260                         rtnl_unlock();
 261
 262                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 263                         kfree_rcu(mc_lst, rcu);
 264                         return 0;
 265                 }
 266         }
 267         spin_unlock(&ipv6_sk_mc_lock);
 268         rtnl_unlock();
 269
 270         return -EADDRNOTAVAIL;
 271 }
 272
 273 /* called with rcu_read_lock() */
 274 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 275                                              const struct in6_addr *group,
 276                                              int ifindex)
 277 {
 278         struct net_device *dev = NULL;
 279         struct inet6_dev *idev = NULL;
 280
 281         if (ifindex == 0) {
 282                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 283
 284                 if (rt) {
 285                         dev = rt->dst.dev;
 286                         ip6_rt_put(rt);
 287                 }
 288         } else
 289                 dev = dev_get_by_index_rcu(net, ifindex);
 290
 291         if (!dev)
 292                 return NULL;
 293         idev = __in6_dev_get(dev);
 294         if (!idev)
 295                 return NULL;
 296         read_lock_bh(&idev->lock);
 297         if (idev->dead) {
 298                 read_unlock_bh(&idev->lock);
 299                 return NULL;
 300         }
 301         return idev;
 302 }
 303
 304 void ipv6_sock_mc_close(struct sock *sk)
 305 {
 306         struct ipv6_pinfo *np = inet6_sk(sk);
 307         struct ipv6_mc_socklist *mc_lst;
 308         struct net *net = sock_net(sk);
 309
 310         if (!rcu_access_pointer(np->ipv6_mc_list))
 311                 return;
 312
 313         rtnl_lock();
 314         spin_lock(&ipv6_sk_mc_lock);
 315         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 316                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 317                 struct net_device *dev;
 318
 319                 np->ipv6_mc_list = mc_lst->next;
 320                 spin_unlock(&ipv6_sk_mc_lock);
 321
 322                 rcu_read_lock();
 323                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 324                 if (dev) {
 325                         struct inet6_dev *idev = __in6_dev_get(dev);
 326
 327                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 328                         if (idev)
 329                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 330                 } else
 331                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 332                 rcu_read_unlock();
 333
 334                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 335                 kfree_rcu(mc_lst, rcu);
 336
 337                 spin_lock(&ipv6_sk_mc_lock);
 338         }
 339         spin_unlock(&ipv6_sk_mc_lock);
 340         rtnl_unlock();
 341 }
 342
 343 int ip6_mc_source(int add, int omode, struct sock *sk,
 344         struct group_source_req *pgsr)
 345 {
 346         struct in6_addr *source, *group;
 347         struct ipv6_mc_socklist *pmc;
 348         struct inet6_dev *idev;
 349         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 350         struct ip6_sf_socklist *psl;
 351         struct net *net = sock_net(sk);
 352         int i, j, rv;
 353         int leavegroup = 0;
 354         int pmclocked = 0;
 355         int err;
 356
 357         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 358         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 359
 360         if (!ipv6_addr_is_multicast(group))
 361                 return -EINVAL;
 362
 363         rcu_read_lock();
 364         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 365         if (!idev) {
 366                 rcu_read_unlock();
 367                 return -ENODEV;
 368         }
 369
 370         err = -EADDRNOTAVAIL;
 371
 372         for_each_pmc_rcu(inet6, pmc) {
 373                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 374                         continue;
 375                 if (ipv6_addr_equal(&pmc->addr, group))
 376                         break;
 377         }
 378         if (!pmc) {             /* must have a prior join */
 379                 err = -EINVAL;
 380                 goto done;
 381         }
 382         /* if a source filter was set, must be the same mode as before */
 383         if (pmc->sflist) {
 384                 if (pmc->sfmode != omode) {
 385                         err = -EINVAL;
 386                         goto done;
 387                 }
 388         } else if (pmc->sfmode != omode) {
 389                 /* allow mode switches for empty-set filters */
 390                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 391                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 392                 pmc->sfmode = omode;
 393         }
 394
 395         write_lock(&pmc->sflock);
 396         pmclocked = 1;
 397
 398         psl = pmc->sflist;
 399         if (!add) {
 400                 if (!psl)
 401                         goto done;      /* err = -EADDRNOTAVAIL */
 402                 rv = !0;
 403                 for (i=0; i<psl->sl_count; i++) {
 404                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 405                         if (rv == 0)
 406                                 break;
 407                 }
 408                 if (rv)         /* source not found */
 409                         goto done;      /* err = -EADDRNOTAVAIL */
 410
 411                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 412                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 413                         leavegroup = 1;
 414                         goto done;
 415                 }
 416
 417                 /* update the interface filter */
 418                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 419
 420                 for (j=i+1; j<psl->sl_count; j++)
 421                         psl->sl_addr[j-1] = psl->sl_addr[j];
 422                 psl->sl_count--;
 423                 err = 0;
 424                 goto done;
 425         }
 426         /* else, add a new source to the filter */
 427
 428         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 429                 err = -ENOBUFS;
 430                 goto done;
 431         }
 432         if (!psl || psl->sl_count == psl->sl_max) {
 433                 struct ip6_sf_socklist *newpsl;
 434                 int count = IP6_SFBLOCK;
 435
 436                 if (psl)
 437                         count += psl->sl_max;
 438                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 439                 if (!newpsl) {
 440                         err = -ENOBUFS;
 441                         goto done;
 442                 }
 443                 newpsl->sl_max = count;
 444                 newpsl->sl_count = count - IP6_SFBLOCK;
 445                 if (psl) {
 446                         for (i=0; i<psl->sl_count; i++)
 447                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 448                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 449                 }
 450                 pmc->sflist = psl = newpsl;
 451         }
 452         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 453         for (i=0; i<psl->sl_count; i++) {
 454                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 455                 if (rv == 0) /* There is an error in the address. */
 456                         goto done;
 457         }
 458         for (j=psl->sl_count-1; j>=i; j--)
 459                 psl->sl_addr[j+1] = psl->sl_addr[j];
 460         psl->sl_addr[i] = *source;
 461         psl->sl_count++;
 462         err = 0;
 463         /* update the interface list */
 464         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 465 done:
 466         if (pmclocked)
 467                 write_unlock(&pmc->sflock);
 468         read_unlock_bh(&idev->lock);
 469         rcu_read_unlock();
 470         if (leavegroup)
 471                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 472         return err;
 473 }
 474
 475 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 476 {
 477         const struct in6_addr *group;
 478         struct ipv6_mc_socklist *pmc;
 479         struct inet6_dev *idev;
 480         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 481         struct ip6_sf_socklist *newpsl, *psl;
 482         struct net *net = sock_net(sk);
 483         int leavegroup = 0;
 484         int i, err;
 485
 486         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 487
 488         if (!ipv6_addr_is_multicast(group))
 489                 return -EINVAL;
 490         if (gsf->gf_fmode != MCAST_INCLUDE &&
 491             gsf->gf_fmode != MCAST_EXCLUDE)
 492                 return -EINVAL;
 493
 494         rcu_read_lock();
 495         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 496
 497         if (!idev) {
 498                 rcu_read_unlock();
 499                 return -ENODEV;
 500         }
 501
 502         err = 0;
 503
 504         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 505                 leavegroup = 1;
 506                 goto done;
 507         }
 508
 509         for_each_pmc_rcu(inet6, pmc) {
 510                 if (pmc->ifindex != gsf->gf_interface)
 511                         continue;
 512                 if (ipv6_addr_equal(&pmc->addr, group))
 513                         break;
 514         }
 515         if (!pmc) {             /* must have a prior join */
 516                 err = -EINVAL;
 517                 goto done;
 518         }
 519         if (gsf->gf_numsrc) {
 520                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 521                                                           GFP_ATOMIC);
 522                 if (!newpsl) {
 523                         err = -ENOBUFS;
 524                         goto done;
 525                 }
 526                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 527                 for (i=0; i<newpsl->sl_count; ++i) {
 528                         struct sockaddr_in6 *psin6;
 529
 530                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 531                         newpsl->sl_addr[i] = psin6->sin6_addr;
 532                 }
 533                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 534                         newpsl->sl_count, newpsl->sl_addr, 0);
 535                 if (err) {
 536                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 537                         goto done;
 538                 }
 539         } else {
 540                 newpsl = NULL;
 541                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 542         }
 543
 544         write_lock(&pmc->sflock);
 545         psl = pmc->sflist;
 546         if (psl) {
 547                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 548                         psl->sl_count, psl->sl_addr, 0);
 549                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 550         } else
 551                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 552         pmc->sflist = newpsl;
 553         pmc->sfmode = gsf->gf_fmode;
 554         write_unlock(&pmc->sflock);
 555         err = 0;
 556 done:
 557         read_unlock_bh(&idev->lock);
 558         rcu_read_unlock();
 559         if (leavegroup)
 560                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 561         return err;
 562 }
 563
 564 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 565         struct group_filter __user *optval, int __user *optlen)
 566 {
 567         int err, i, count, copycount;
 568         const struct in6_addr *group;
 569         struct ipv6_mc_socklist *pmc;
 570         struct inet6_dev *idev;
 571         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 572         struct ip6_sf_socklist *psl;
 573         struct net *net = sock_net(sk);
 574
 575         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 576
 577         if (!ipv6_addr_is_multicast(group))
 578                 return -EINVAL;
 579
 580         rcu_read_lock();
 581         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 582
 583         if (!idev) {
 584                 rcu_read_unlock();
 585                 return -ENODEV;
 586         }
 587
 588         err = -EADDRNOTAVAIL;
 589         /*
 590          * changes to the ipv6_mc_list require the socket lock and
 591          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 592          * so reading the list is safe.
 593          */
 594
 595         for_each_pmc_rcu(inet6, pmc) {
 596                 if (pmc->ifindex != gsf->gf_interface)
 597                         continue;
 598                 if (ipv6_addr_equal(group, &pmc->addr))
 599                         break;
 600         }
 601         if (!pmc)               /* must have a prior join */
 602                 goto done;
 603         gsf->gf_fmode = pmc->sfmode;
 604         psl = pmc->sflist;
 605         count = psl ? psl->sl_count : 0;
 606         read_unlock_bh(&idev->lock);
 607         rcu_read_unlock();
 608
 609         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 610         gsf->gf_numsrc = count;
 611         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 612             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 613                 return -EFAULT;
 614         }
 615         /* changes to psl require the socket lock, a read lock on
 616          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 617          * have the socket lock, so reading here is safe.
 618          */
 619         for (i=0; i<copycount; i++) {
 620                 struct sockaddr_in6 *psin6;
 621                 struct sockaddr_storage ss;
 622
 623                 psin6 = (struct sockaddr_in6 *)&ss;
 624                 memset(&ss, 0, sizeof(ss));
 625                 psin6->sin6_family = AF_INET6;
 626                 psin6->sin6_addr = psl->sl_addr[i];
 627                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 628                         return -EFAULT;
 629         }
 630         return 0;
 631 done:
 632         read_unlock_bh(&idev->lock);
 633         rcu_read_unlock();
 634         return err;
 635 }
 636
 637 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 638                     const struct in6_addr *src_addr)
 639 {
 640         struct ipv6_pinfo *np = inet6_sk(sk);
 641         struct ipv6_mc_socklist *mc;
 642         struct ip6_sf_socklist *psl;
 643         bool rv = true;
 644
 645         rcu_read_lock();
 646         for_each_pmc_rcu(np, mc) {
 647                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 648                         break;
 649         }
 650         if (!mc) {
 651                 rcu_read_unlock();
 652                 return true;
 653         }
 654         read_lock(&mc->sflock);
 655         psl = mc->sflist;
 656         if (!psl) {
 657                 rv = mc->sfmode == MCAST_EXCLUDE;
 658         } else {
 659                 int i;
 660
 661                 for (i=0; i<psl->sl_count; i++) {
 662                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 663                                 break;
 664                 }
 665                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 666                         rv = false;
 667                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 668                         rv = false;
 669         }
 670         read_unlock(&mc->sflock);
 671         rcu_read_unlock();
 672
 673         return rv;
 674 }
 675
 676 static void ma_put(struct ifmcaddr6 *mc)
 677 {
 678         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 679                 in6_dev_put(mc->idev);
 680                 kfree(mc);
 681         }
 682 }
 683
 684 static void igmp6_group_added(struct ifmcaddr6 *mc)
 685 {
 686         struct net_device *dev = mc->idev->dev;
 687         char buf[MAX_ADDR_LEN];
 688
 689         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 690             IPV6_ADDR_SCOPE_LINKLOCAL)
 691                 return;
 692
 693         spin_lock_bh(&mc->mca_lock);
 694         if (!(mc->mca_flags&MAF_LOADED)) {
 695                 mc->mca_flags |= MAF_LOADED;
 696                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 697                         dev_mc_add(dev, buf);
 698         }
 699         spin_unlock_bh(&mc->mca_lock);
 700
 701         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 702                 return;
 703
 704         if (mld_in_v1_mode(mc->idev)) {
 705                 igmp6_join_group(mc);
 706                 return;
 707         }
 708         /* else v2 */
 709
 710         mc->mca_crcount = mc->idev->mc_qrv;
 711         mld_ifc_event(mc->idev);
 712 }
 713
 714 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 715 {
 716         struct net_device *dev = mc->idev->dev;
 717         char buf[MAX_ADDR_LEN];
 718
 719         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 720             IPV6_ADDR_SCOPE_LINKLOCAL)
 721                 return;
 722
 723         spin_lock_bh(&mc->mca_lock);
 724         if (mc->mca_flags&MAF_LOADED) {
 725                 mc->mca_flags &= ~MAF_LOADED;
 726                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 727                         dev_mc_del(dev, buf);
 728         }
 729
 730         if (mc->mca_flags & MAF_NOREPORT)
 731                 goto done;
 732         spin_unlock_bh(&mc->mca_lock);
 733
 734         if (!mc->idev->dead)
 735                 igmp6_leave_group(mc);
 736
 737         spin_lock_bh(&mc->mca_lock);
 738         if (del_timer(&mc->mca_timer))
 739                 atomic_dec(&mc->mca_refcnt);
 740 done:
 741         ip6_mc_clear_src(mc);
 742         spin_unlock_bh(&mc->mca_lock);
 743 }
 744
 745 /*
 746  * deleted ifmcaddr6 manipulation
 747  */
 748 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 749 {
 750         struct ifmcaddr6 *pmc;
 751
 752         /* this is an "ifmcaddr6" for convenience; only the fields below
 753          * are actually used. In particular, the refcnt and users are not
 754          * used for management of the delete list. Using the same structure
 755          * for deleted items allows change reports to use common code with
 756          * non-deleted or query-response MCA's.
 757          */
 758         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 759         if (!pmc)
 760                 return;
 761
 762         spin_lock_bh(&im->mca_lock);
 763         spin_lock_init(&pmc->mca_lock);
 764         pmc->idev = im->idev;
 765         in6_dev_hold(idev);
 766         pmc->mca_addr = im->mca_addr;
 767         pmc->mca_crcount = idev->mc_qrv;
 768         pmc->mca_sfmode = im->mca_sfmode;
 769         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 770                 struct ip6_sf_list *psf;
 771
 772                 pmc->mca_tomb = im->mca_tomb;
 773                 pmc->mca_sources = im->mca_sources;
 774                 im->mca_tomb = im->mca_sources = NULL;
 775                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 776                         psf->sf_crcount = pmc->mca_crcount;
 777         }
 778         spin_unlock_bh(&im->mca_lock);
 779
 780         spin_lock_bh(&idev->mc_lock);
 781         pmc->next = idev->mc_tomb;
 782         idev->mc_tomb = pmc;
 783         spin_unlock_bh(&idev->mc_lock);
 784 }
 785
 786 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 787 {
 788         struct ifmcaddr6 *pmc, *pmc_prev;
 789         struct ip6_sf_list *psf, *psf_next;
 790
 791         spin_lock_bh(&idev->mc_lock);
 792         pmc_prev = NULL;
 793         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 794                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 795                         break;
 796                 pmc_prev = pmc;
 797         }
 798         if (pmc) {
 799                 if (pmc_prev)
 800                         pmc_prev->next = pmc->next;
 801                 else
 802                         idev->mc_tomb = pmc->next;
 803         }
 804         spin_unlock_bh(&idev->mc_lock);
 805
 806         if (pmc) {
 807                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 808                         psf_next = psf->sf_next;
 809                         kfree(psf);
 810                 }
 811                 in6_dev_put(pmc->idev);
 812                 kfree(pmc);
 813         }
 814 }
 815
 816 static void mld_clear_delrec(struct inet6_dev *idev)
 817 {
 818         struct ifmcaddr6 *pmc, *nextpmc;
 819
 820         spin_lock_bh(&idev->mc_lock);
 821         pmc = idev->mc_tomb;
 822         idev->mc_tomb = NULL;
 823         spin_unlock_bh(&idev->mc_lock);
 824
 825         for (; pmc; pmc = nextpmc) {
 826                 nextpmc = pmc->next;
 827                 ip6_mc_clear_src(pmc);
 828                 in6_dev_put(pmc->idev);
 829                 kfree(pmc);
 830         }
 831
 832         /* clear dead sources, too */
 833         read_lock_bh(&idev->lock);
 834         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 835                 struct ip6_sf_list *psf, *psf_next;
 836
 837                 spin_lock_bh(&pmc->mca_lock);
 838                 psf = pmc->mca_tomb;
 839                 pmc->mca_tomb = NULL;
 840                 spin_unlock_bh(&pmc->mca_lock);
 841                 for (; psf; psf=psf_next) {
 842                         psf_next = psf->sf_next;
 843                         kfree(psf);
 844                 }
 845         }
 846         read_unlock_bh(&idev->lock);
 847 }
 848
 849
 850 /*
 851  *      device multicast group inc (add if not found)
 852  */
 853 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 854 {
 855         struct ifmcaddr6 *mc;
 856         struct inet6_dev *idev;
 857
 858         ASSERT_RTNL();
 859
 860         /* we need to take a reference on idev */
 861         idev = in6_dev_get(dev);
 862
 863         if (idev == NULL)
 864                 return -EINVAL;
 865
 866         write_lock_bh(&idev->lock);
 867         if (idev->dead) {
 868                 write_unlock_bh(&idev->lock);
 869                 in6_dev_put(idev);
 870                 return -ENODEV;
 871         }
 872
 873         for (mc = idev->mc_list; mc; mc = mc->next) {
 874                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 875                         mc->mca_users++;
 876                         write_unlock_bh(&idev->lock);
 877                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 878                                 NULL, 0);
 879                         in6_dev_put(idev);
 880                         return 0;
 881                 }
 882         }
 883
 884         /*
 885          *      not found: create a new one.
 886          */
 887
 888         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 889
 890         if (mc == NULL) {
 891                 write_unlock_bh(&idev->lock);
 892                 in6_dev_put(idev);
 893                 return -ENOMEM;
 894         }
 895
 896         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 897
 898         mc->mca_addr = *addr;
 899         mc->idev = idev; /* (reference taken) */
 900         mc->mca_users = 1;
 901         /* mca_stamp should be updated upon changes */
 902         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 903         atomic_set(&mc->mca_refcnt, 2);
 904         spin_lock_init(&mc->mca_lock);
 905
 906         /* initial mode is (EX, empty) */
 907         mc->mca_sfmode = MCAST_EXCLUDE;
 908         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 909
 910         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 911             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 912                 mc->mca_flags |= MAF_NOREPORT;
 913
 914         mc->next = idev->mc_list;
 915         idev->mc_list = mc;
 916         write_unlock_bh(&idev->lock);
 917
 918         mld_del_delrec(idev, &mc->mca_addr);
 919         igmp6_group_added(mc);
 920         ma_put(mc);
 921         return 0;
 922 }
 923
 924 /*
 925  *      device multicast group del
 926  */
 927 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 928 {
 929         struct ifmcaddr6 *ma, **map;
 930
 931         ASSERT_RTNL();
 932
 933         write_lock_bh(&idev->lock);
 934         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 935                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 936                         if (--ma->mca_users == 0) {
 937                                 *map = ma->next;
 938                                 write_unlock_bh(&idev->lock);
 939
 940                                 igmp6_group_dropped(ma);
 941
 942                                 ma_put(ma);
 943                                 return 0;
 944                         }
 945                         write_unlock_bh(&idev->lock);
 946                         return 0;
 947                 }
 948         }
 949         write_unlock_bh(&idev->lock);
 950
 951         return -ENOENT;
 952 }
 953
 954 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 955 {
 956         struct inet6_dev *idev;
 957         int err;
 958
 959         rcu_read_lock();
 960
 961         idev = __in6_dev_get(dev);
 962         if (!idev)
 963                 err = -ENODEV;
 964         else
 965                 err = __ipv6_dev_mc_dec(idev, addr);
 966
 967         rcu_read_unlock();
 968         return err;
 969 }
 970
 971 /*
 972  *      check if the interface/address pair is valid
 973  */
 974 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 975                          const struct in6_addr *src_addr)
 976 {
 977         struct inet6_dev *idev;
 978         struct ifmcaddr6 *mc;
 979         bool rv = false;
 980
 981         rcu_read_lock();
 982         idev = __in6_dev_get(dev);
 983         if (idev) {
 984                 read_lock_bh(&idev->lock);
 985                 for (mc = idev->mc_list; mc; mc=mc->next) {
 986                         if (ipv6_addr_equal(&mc->mca_addr, group))
 987                                 break;
 988                 }
 989                 if (mc) {
 990                         if (src_addr && !ipv6_addr_any(src_addr)) {
 991                                 struct ip6_sf_list *psf;
 992
 993                                 spin_lock_bh(&mc->mca_lock);
 994                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 995                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 996                                                 break;
 997                                 }
 998                                 if (psf)
 999                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1000                                                 psf->sf_count[MCAST_EXCLUDE] !=
1001                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1002                                 else
1003                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1004                                 spin_unlock_bh(&mc->mca_lock);
1005                         } else
1006                                 rv = true; /* don't filter unspecified source */
1007                 }
1008                 read_unlock_bh(&idev->lock);
1009         }
1010         rcu_read_unlock();
1011         return rv;
1012 }
1013
1014 static void mld_gq_start_timer(struct inet6_dev *idev)
1015 {
1016         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1017
1018         idev->mc_gq_running = 1;
1019         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1020                 in6_dev_hold(idev);
1021 }
1022
1023 static void mld_gq_stop_timer(struct inet6_dev *idev)
1024 {
1025         idev->mc_gq_running = 0;
1026         if (del_timer(&idev->mc_gq_timer))
1027                 __in6_dev_put(idev);
1028 }
1029
1030 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1031 {
1032         unsigned long tv = prandom_u32() % delay;
1033
1034         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1035                 in6_dev_hold(idev);
1036 }
1037
1038 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1039 {
1040         idev->mc_ifc_count = 0;
1041         if (del_timer(&idev->mc_ifc_timer))
1042                 __in6_dev_put(idev);
1043 }
1044
1045 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1046 {
1047         unsigned long tv = prandom_u32() % delay;
1048
1049         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1050                 in6_dev_hold(idev);
1051 }
1052
1053 static void mld_dad_stop_timer(struct inet6_dev *idev)
1054 {
1055         if (del_timer(&idev->mc_dad_timer))
1056                 __in6_dev_put(idev);
1057 }
1058
1059 /*
1060  *      IGMP handling (alias multicast ICMPv6 messages)
1061  */
1062
1063 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1064 {
1065         unsigned long delay = resptime;
1066
1067         /* Do not start timer for these addresses */
1068         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1069             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1070                 return;
1071
1072         if (del_timer(&ma->mca_timer)) {
1073                 atomic_dec(&ma->mca_refcnt);
1074                 delay = ma->mca_timer.expires - jiffies;
1075         }
1076
1077         if (delay >= resptime)
1078                 delay = prandom_u32() % resptime;
1079
1080         ma->mca_timer.expires = jiffies + delay;
1081         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1082                 atomic_inc(&ma->mca_refcnt);
1083         ma->mca_flags |= MAF_TIMER_RUNNING;
1084 }
1085
1086 /* mark EXCLUDE-mode sources */
1087 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1088                              const struct in6_addr *srcs)
1089 {
1090         struct ip6_sf_list *psf;
1091         int i, scount;
1092
1093         scount = 0;
1094         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1095                 if (scount == nsrcs)
1096                         break;
1097                 for (i=0; i<nsrcs; i++) {
1098                         /* skip inactive filters */
1099                         if (psf->sf_count[MCAST_INCLUDE] ||
1100                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1101                             psf->sf_count[MCAST_EXCLUDE])
1102                                 break;
1103                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1104                                 scount++;
1105                                 break;
1106                         }
1107                 }
1108         }
1109         pmc->mca_flags &= ~MAF_GSQUERY;
1110         if (scount == nsrcs)    /* all sources excluded */
1111                 return false;
1112         return true;
1113 }
1114
1115 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1116                             const struct in6_addr *srcs)
1117 {
1118         struct ip6_sf_list *psf;
1119         int i, scount;
1120
1121         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1122                 return mld_xmarksources(pmc, nsrcs, srcs);
1123
1124         /* mark INCLUDE-mode sources */
1125
1126         scount = 0;
1127         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1128                 if (scount == nsrcs)
1129                         break;
1130                 for (i=0; i<nsrcs; i++) {
1131                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1132                                 psf->sf_gsresp = 1;
1133                                 scount++;
1134                                 break;
1135                         }
1136                 }
1137         }
1138         if (!scount) {
1139                 pmc->mca_flags &= ~MAF_GSQUERY;
1140                 return false;
1141         }
1142         pmc->mca_flags |= MAF_GSQUERY;
1143         return true;
1144 }
1145
1146 static int mld_force_mld_version(const struct inet6_dev *idev)
1147 {
1148         /* Normally, both are 0 here. If enforcement to a particular is
1149          * being used, individual device enforcement will have a lower
1150          * precedence over 'all' device (.../conf/all/force_mld_version).
1151          */
1152
1153         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1154                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1155         else
1156                 return idev->cnf.force_mld_version;
1157 }
1158
1159 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1160 {
1161         return mld_force_mld_version(idev) == 2;
1162 }
1163
1164 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1165 {
1166         return mld_force_mld_version(idev) == 1;
1167 }
1168
1169 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1170 {
1171         if (mld_in_v2_mode_only(idev))
1172                 return false;
1173         if (mld_in_v1_mode_only(idev))
1174                 return true;
1175         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1176                 return true;
1177
1178         return false;
1179 }
1180
1181 static void mld_set_v1_mode(struct inet6_dev *idev)
1182 {
1183         /* RFC3810, relevant sections:
1184          *  - 9.1. Robustness Variable
1185          *  - 9.2. Query Interval
1186          *  - 9.3. Query Response Interval
1187          *  - 9.12. Older Version Querier Present Timeout
1188          */
1189         unsigned long switchback;
1190
1191         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1192
1193         idev->mc_v1_seen = jiffies + switchback;
1194 }
1195
1196 static void mld_update_qrv(struct inet6_dev *idev,
1197                            const struct mld2_query *mlh2)
1198 {
1199         /* RFC3810, relevant sections:
1200          *  - 5.1.8. QRV (Querier's Robustness Variable)
1201          *  - 9.1. Robustness Variable
1202          */
1203
1204         /* The value of the Robustness Variable MUST NOT be zero,
1205          * and SHOULD NOT be one. Catch this here if we ever run
1206          * into such a case in future.
1207          */
1208         WARN_ON(idev->mc_qrv == 0);
1209
1210         if (mlh2->mld2q_qrv > 0)
1211                 idev->mc_qrv = mlh2->mld2q_qrv;
1212
1213         if (unlikely(idev->mc_qrv < 2)) {
1214                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1215                                      idev->mc_qrv, MLD_QRV_DEFAULT);
1216                 idev->mc_qrv = MLD_QRV_DEFAULT;
1217         }
1218 }
1219
1220 static void mld_update_qi(struct inet6_dev *idev,
1221                           const struct mld2_query *mlh2)
1222 {
1223         /* RFC3810, relevant sections:
1224          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1225          *  - 9.2. Query Interval
1226          *  - 9.12. Older Version Querier Present Timeout
1227          *    (the [Query Interval] in the last Query received)
1228          */
1229         unsigned long mc_qqi;
1230
1231         if (mlh2->mld2q_qqic < 128) {
1232                 mc_qqi = mlh2->mld2q_qqic;
1233         } else {
1234                 unsigned long mc_man, mc_exp;
1235
1236                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1237                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1238
1239                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1240         }
1241
1242         idev->mc_qi = mc_qqi * HZ;
1243 }
1244
1245 static void mld_update_qri(struct inet6_dev *idev,
1246                            const struct mld2_query *mlh2)
1247 {
1248         /* RFC3810, relevant sections:
1249          *  - 5.1.3. Maximum Response Code
1250          *  - 9.3. Query Response Interval
1251          */
1252         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1253 }
1254
1255 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1256                           unsigned long *max_delay)
1257 {
1258         unsigned long mldv1_md;
1259
1260         /* Ignore v1 queries */
1261         if (mld_in_v2_mode_only(idev))
1262                 return -EINVAL;
1263
1264         /* MLDv1 router present */
1265         mldv1_md = ntohs(mld->mld_maxdelay);
1266         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1267
1268         mld_set_v1_mode(idev);
1269
1270         /* cancel MLDv2 report timer */
1271         mld_gq_stop_timer(idev);
1272         /* cancel the interface change timer */
1273         mld_ifc_stop_timer(idev);
1274         /* clear deleted report items */
1275         mld_clear_delrec(idev);
1276
1277         return 0;
1278 }
1279
1280 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1281                           unsigned long *max_delay)
1282 {
1283         /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1284         if (mld_in_v1_mode(idev))
1285                 return -EINVAL;
1286
1287         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1288
1289         mld_update_qrv(idev, mld);
1290         mld_update_qi(idev, mld);
1291         mld_update_qri(idev, mld);
1292
1293         idev->mc_maxdelay = *max_delay;
1294
1295         return 0;
1296 }
1297
1298 /* called with rcu_read_lock() */
1299 int igmp6_event_query(struct sk_buff *skb)
1300 {
1301         struct mld2_query *mlh2 = NULL;
1302         struct ifmcaddr6 *ma;
1303         const struct in6_addr *group;
1304         unsigned long max_delay;
1305         struct inet6_dev *idev;
1306         struct mld_msg *mld;
1307         int group_type;
1308         int mark = 0;
1309         int len, err;
1310
1311         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1312                 return -EINVAL;
1313
1314         /* compute payload length excluding extension headers */
1315         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1316         len -= skb_network_header_len(skb);
1317
1318         /* RFC3810 6.2
1319          * Upon reception of an MLD message that contains a Query, the node
1320          * checks if the source address of the message is a valid link-local
1321          * address, if the Hop Limit is set to 1, and if the Router Alert
1322          * option is present in the Hop-By-Hop Options header of the IPv6
1323          * packet.  If any of these checks fails, the packet is dropped.
1324          */
1325         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1326             ipv6_hdr(skb)->hop_limit != 1 ||
1327             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1328             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1329                 return -EINVAL;
1330
1331         idev = __in6_dev_get(skb->dev);
1332         if (idev == NULL)
1333                 return 0;
1334
1335         mld = (struct mld_msg *)icmp6_hdr(skb);
1336         group = &mld->mld_mca;
1337         group_type = ipv6_addr_type(group);
1338
1339         if (group_type != IPV6_ADDR_ANY &&
1340             !(group_type&IPV6_ADDR_MULTICAST))
1341                 return -EINVAL;
1342
1343         if (len == MLD_V1_QUERY_LEN) {
1344                 err = mld_process_v1(idev, mld, &max_delay);
1345                 if (err < 0)
1346                         return err;
1347         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1348                 int srcs_offset = sizeof(struct mld2_query) -
1349                                   sizeof(struct icmp6hdr);
1350
1351                 if (!pskb_may_pull(skb, srcs_offset))
1352                         return -EINVAL;
1353
1354                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1355
1356                 err = mld_process_v2(idev, mlh2, &max_delay);
1357                 if (err < 0)
1358                         return err;
1359
1360                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1361                         if (mlh2->mld2q_nsrcs)
1362                                 return -EINVAL; /* no sources allowed */
1363
1364                         mld_gq_start_timer(idev);
1365                         return 0;
1366                 }
1367                 /* mark sources to include, if group & source-specific */
1368                 if (mlh2->mld2q_nsrcs != 0) {
1369                         if (!pskb_may_pull(skb, srcs_offset +
1370                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1371                                 return -EINVAL;
1372
1373                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1374                         mark = 1;
1375                 }
1376         } else
1377                 return -EINVAL;
1378
1379         read_lock_bh(&idev->lock);
1380         if (group_type == IPV6_ADDR_ANY) {
1381                 for (ma = idev->mc_list; ma; ma=ma->next) {
1382                         spin_lock_bh(&ma->mca_lock);
1383                         igmp6_group_queried(ma, max_delay);
1384                         spin_unlock_bh(&ma->mca_lock);
1385                 }
1386         } else {
1387                 for (ma = idev->mc_list; ma; ma=ma->next) {
1388                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1389                                 continue;
1390                         spin_lock_bh(&ma->mca_lock);
1391                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1392                                 /* gsquery <- gsquery && mark */
1393                                 if (!mark)
1394                                         ma->mca_flags &= ~MAF_GSQUERY;
1395                         } else {
1396                                 /* gsquery <- mark */
1397                                 if (mark)
1398                                         ma->mca_flags |= MAF_GSQUERY;
1399                                 else
1400                                         ma->mca_flags &= ~MAF_GSQUERY;
1401                         }
1402                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1403                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1404                                 igmp6_group_queried(ma, max_delay);
1405                         spin_unlock_bh(&ma->mca_lock);
1406                         break;
1407                 }
1408         }
1409         read_unlock_bh(&idev->lock);
1410
1411         return 0;
1412 }
1413
1414 /* called with rcu_read_lock() */
1415 int igmp6_event_report(struct sk_buff *skb)
1416 {
1417         struct ifmcaddr6 *ma;
1418         struct inet6_dev *idev;
1419         struct mld_msg *mld;
1420         int addr_type;
1421
1422         /* Our own report looped back. Ignore it. */
1423         if (skb->pkt_type == PACKET_LOOPBACK)
1424                 return 0;
1425
1426         /* send our report if the MC router may not have heard this report */
1427         if (skb->pkt_type != PACKET_MULTICAST &&
1428             skb->pkt_type != PACKET_BROADCAST)
1429                 return 0;
1430
1431         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1432                 return -EINVAL;
1433
1434         mld = (struct mld_msg *)icmp6_hdr(skb);
1435
1436         /* Drop reports with not link local source */
1437         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1438         if (addr_type != IPV6_ADDR_ANY &&
1439             !(addr_type&IPV6_ADDR_LINKLOCAL))
1440                 return -EINVAL;
1441
1442         idev = __in6_dev_get(skb->dev);
1443         if (idev == NULL)
1444                 return -ENODEV;
1445
1446         /*
1447          *      Cancel the timer for this group
1448          */
1449
1450         read_lock_bh(&idev->lock);
1451         for (ma = idev->mc_list; ma; ma=ma->next) {
1452                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1453                         spin_lock(&ma->mca_lock);
1454                         if (del_timer(&ma->mca_timer))
1455                                 atomic_dec(&ma->mca_refcnt);
1456                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1457                         spin_unlock(&ma->mca_lock);
1458                         break;
1459                 }
1460         }
1461         read_unlock_bh(&idev->lock);
1462         return 0;
1463 }
1464
1465 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1466                   int gdeleted, int sdeleted)
1467 {
1468         switch (type) {
1469         case MLD2_MODE_IS_INCLUDE:
1470         case MLD2_MODE_IS_EXCLUDE:
1471                 if (gdeleted || sdeleted)
1472                         return false;
1473                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1474                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1475                                 return true;
1476                         /* don't include if this source is excluded
1477                          * in all filters
1478                          */
1479                         if (psf->sf_count[MCAST_INCLUDE])
1480                                 return type == MLD2_MODE_IS_INCLUDE;
1481                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1482                                 psf->sf_count[MCAST_EXCLUDE];
1483                 }
1484                 return false;
1485         case MLD2_CHANGE_TO_INCLUDE:
1486                 if (gdeleted || sdeleted)
1487                         return false;
1488                 return psf->sf_count[MCAST_INCLUDE] != 0;
1489         case MLD2_CHANGE_TO_EXCLUDE:
1490                 if (gdeleted || sdeleted)
1491                         return false;
1492                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1493                     psf->sf_count[MCAST_INCLUDE])
1494                         return false;
1495                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1496                         psf->sf_count[MCAST_EXCLUDE];
1497         case MLD2_ALLOW_NEW_SOURCES:
1498                 if (gdeleted || !psf->sf_crcount)
1499                         return false;
1500                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1501         case MLD2_BLOCK_OLD_SOURCES:
1502                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1503                         return gdeleted || (psf->sf_crcount && sdeleted);
1504                 return psf->sf_crcount && !gdeleted && !sdeleted;
1505         }
1506         return false;
1507 }
1508
1509 static int
1510 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1511 {
1512         struct ip6_sf_list *psf;
1513         int scount = 0;
1514
1515         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1516                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1517                         continue;
1518                 scount++;
1519         }
1520         return scount;
1521 }
1522
1523 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1524                        struct net_device *dev,
1525                        const struct in6_addr *saddr,
1526                        const struct in6_addr *daddr,
1527                        int proto, int len)
1528 {
1529         struct ipv6hdr *hdr;
1530
1531         skb->protocol = htons(ETH_P_IPV6);
1532         skb->dev = dev;
1533
1534         skb_reset_network_header(skb);
1535         skb_put(skb, sizeof(struct ipv6hdr));
1536         hdr = ipv6_hdr(skb);
1537
1538         ip6_flow_hdr(hdr, 0, 0);
1539
1540         hdr->payload_len = htons(len);
1541         hdr->nexthdr = proto;
1542         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1543
1544         hdr->saddr = *saddr;
1545         hdr->daddr = *daddr;
1546 }
1547
1548 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1549 {
1550         struct net_device *dev = idev->dev;
1551         struct net *net = dev_net(dev);
1552         struct sock *sk = net->ipv6.igmp_sk;
1553         struct sk_buff *skb;
1554         struct mld2_report *pmr;
1555         struct in6_addr addr_buf;
1556         const struct in6_addr *saddr;
1557         int hlen = LL_RESERVED_SPACE(dev);
1558         int tlen = dev->needed_tailroom;
1559         int err;
1560         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1561                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1562                      IPV6_TLV_PADN, 0 };
1563
1564         /* we assume size > sizeof(ra) here */
1565         size += hlen + tlen;
1566         /* limit our allocations to order-0 page */
1567         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1568         skb = sock_alloc_send_skb(sk, size, 1, &err);
1569
1570         if (!skb)
1571                 return NULL;
1572
1573         skb->priority = TC_PRIO_CONTROL;
1574         skb_reserve(skb, hlen);
1575
1576         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1577                 /* <draft-ietf-magma-mld-source-05.txt>:
1578                  * use unspecified address as the source address
1579                  * when a valid link-local address is not available.
1580                  */
1581                 saddr = &in6addr_any;
1582         } else
1583                 saddr = &addr_buf;
1584
1585         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1586
1587         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1588
1589         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1590         skb_put(skb, sizeof(*pmr));
1591         pmr = (struct mld2_report *)skb_transport_header(skb);
1592         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1593         pmr->mld2r_resv1 = 0;
1594         pmr->mld2r_cksum = 0;
1595         pmr->mld2r_resv2 = 0;
1596         pmr->mld2r_ngrec = 0;
1597         return skb;
1598 }
1599
1600 static void mld_sendpack(struct sk_buff *skb)
1601 {
1602         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1603         struct mld2_report *pmr =
1604                               (struct mld2_report *)skb_transport_header(skb);
1605         int payload_len, mldlen;
1606         struct inet6_dev *idev;
1607         struct net *net = dev_net(skb->dev);
1608         int err;
1609         struct flowi6 fl6;
1610         struct dst_entry *dst;
1611
1612         rcu_read_lock();
1613         idev = __in6_dev_get(skb->dev);
1614         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1615
1616         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1617                 sizeof(*pip6);
1618         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1619         pip6->payload_len = htons(payload_len);
1620
1621         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1622                                            IPPROTO_ICMPV6,
1623                                            csum_partial(skb_transport_header(skb),
1624                                                         mldlen, 0));
1625
1626         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1627                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1628                          skb->dev->ifindex);
1629         dst = icmp6_dst_alloc(skb->dev, &fl6);
1630
1631         err = 0;
1632         if (IS_ERR(dst)) {
1633                 err = PTR_ERR(dst);
1634                 dst = NULL;
1635         }
1636         skb_dst_set(skb, dst);
1637         if (err)
1638                 goto err_out;
1639
1640         payload_len = skb->len;
1641
1642         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1643                       dst_output);
1644 out:
1645         if (!err) {
1646                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1647                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1648                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1649         } else {
1650                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1651         }
1652
1653         rcu_read_unlock();
1654         return;
1655
1656 err_out:
1657         kfree_skb(skb);
1658         goto out;
1659 }
1660
1661 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1662 {
1663         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1664 }
1665
1666 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1667         int type, struct mld2_grec **ppgr)
1668 {
1669         struct net_device *dev = pmc->idev->dev;
1670         struct mld2_report *pmr;
1671         struct mld2_grec *pgr;
1672
1673         if (!skb)
1674                 skb = mld_newpack(pmc->idev, dev->mtu);
1675         if (!skb)
1676                 return NULL;
1677         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1678         pgr->grec_type = type;
1679         pgr->grec_auxwords = 0;
1680         pgr->grec_nsrcs = 0;
1681         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1682         pmr = (struct mld2_report *)skb_transport_header(skb);
1683         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1684         *ppgr = pgr;
1685         return skb;
1686 }
1687
1688 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1689         skb_tailroom(skb)) : 0)
1690
1691 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1692         int type, int gdeleted, int sdeleted, int crsend)
1693 {
1694         struct inet6_dev *idev = pmc->idev;
1695         struct net_device *dev = idev->dev;
1696         struct mld2_report *pmr;
1697         struct mld2_grec *pgr = NULL;
1698         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1699         int scount, stotal, first, isquery, truncate;
1700
1701         if (pmc->mca_flags & MAF_NOREPORT)
1702                 return skb;
1703
1704         isquery = type == MLD2_MODE_IS_INCLUDE ||
1705                   type == MLD2_MODE_IS_EXCLUDE;
1706         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1707                     type == MLD2_CHANGE_TO_EXCLUDE;
1708
1709         stotal = scount = 0;
1710
1711         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1712
1713         if (!*psf_list)
1714                 goto empty_source;
1715
1716         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1717
1718         /* EX and TO_EX get a fresh packet, if needed */
1719         if (truncate) {
1720                 if (pmr && pmr->mld2r_ngrec &&
1721                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1722                         if (skb)
1723                                 mld_sendpack(skb);
1724                         skb = mld_newpack(idev, dev->mtu);
1725                 }
1726         }
1727         first = 1;
1728         psf_prev = NULL;
1729         for (psf=*psf_list; psf; psf=psf_next) {
1730                 struct in6_addr *psrc;
1731
1732                 psf_next = psf->sf_next;
1733
1734                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1735                         psf_prev = psf;
1736                         continue;
1737                 }
1738
1739                 /* clear marks on query responses */
1740                 if (isquery)
1741                         psf->sf_gsresp = 0;
1742
1743                 if (AVAILABLE(skb) < sizeof(*psrc) +
1744                     first*sizeof(struct mld2_grec)) {
1745                         if (truncate && !first)
1746                                 break;   /* truncate these */
1747                         if (pgr)
1748                                 pgr->grec_nsrcs = htons(scount);
1749                         if (skb)
1750                                 mld_sendpack(skb);
1751                         skb = mld_newpack(idev, dev->mtu);
1752                         first = 1;
1753                         scount = 0;
1754                 }
1755                 if (first) {
1756                         skb = add_grhead(skb, pmc, type, &pgr);
1757                         first = 0;
1758                 }
1759                 if (!skb)
1760                         return NULL;
1761                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1762                 *psrc = psf->sf_addr;
1763                 scount++; stotal++;
1764                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1765                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1766                         psf->sf_crcount--;
1767                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1768                                 if (psf_prev)
1769                                         psf_prev->sf_next = psf->sf_next;
1770                                 else
1771                                         *psf_list = psf->sf_next;
1772                                 kfree(psf);
1773                                 continue;
1774                         }
1775                 }
1776                 psf_prev = psf;
1777         }
1778
1779 empty_source:
1780         if (!stotal) {
1781                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1782                     type == MLD2_BLOCK_OLD_SOURCES)
1783                         return skb;
1784                 if (pmc->mca_crcount || isquery || crsend) {
1785                         /* make sure we have room for group header */
1786                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1787                                 mld_sendpack(skb);
1788                                 skb = NULL; /* add_grhead will get a new one */
1789                         }
1790                         skb = add_grhead(skb, pmc, type, &pgr);
1791                 }
1792         }
1793         if (pgr)
1794                 pgr->grec_nsrcs = htons(scount);
1795
1796         if (isquery)
1797                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1798         return skb;
1799 }
1800
1801 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1802 {
1803         struct sk_buff *skb = NULL;
1804         int type;
1805
1806         read_lock_bh(&idev->lock);
1807         if (!pmc) {
1808                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1809                         if (pmc->mca_flags & MAF_NOREPORT)
1810                                 continue;
1811                         spin_lock_bh(&pmc->mca_lock);
1812                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1813                                 type = MLD2_MODE_IS_EXCLUDE;
1814                         else
1815                                 type = MLD2_MODE_IS_INCLUDE;
1816                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1817                         spin_unlock_bh(&pmc->mca_lock);
1818                 }
1819         } else {
1820                 spin_lock_bh(&pmc->mca_lock);
1821                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1822                         type = MLD2_MODE_IS_EXCLUDE;
1823                 else
1824                         type = MLD2_MODE_IS_INCLUDE;
1825                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1826                 spin_unlock_bh(&pmc->mca_lock);
1827         }
1828         read_unlock_bh(&idev->lock);
1829         if (skb)
1830                 mld_sendpack(skb);
1831 }
1832
1833 /*
1834  * remove zero-count source records from a source filter list
1835  */
1836 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1837 {
1838         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1839
1840         psf_prev = NULL;
1841         for (psf=*ppsf; psf; psf = psf_next) {
1842                 psf_next = psf->sf_next;
1843                 if (psf->sf_crcount == 0) {
1844                         if (psf_prev)
1845                                 psf_prev->sf_next = psf->sf_next;
1846                         else
1847                                 *ppsf = psf->sf_next;
1848                         kfree(psf);
1849                 } else
1850                         psf_prev = psf;
1851         }
1852 }
1853
1854 static void mld_send_cr(struct inet6_dev *idev)
1855 {
1856         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1857         struct sk_buff *skb = NULL;
1858         int type, dtype;
1859
1860         read_lock_bh(&idev->lock);
1861         spin_lock(&idev->mc_lock);
1862
1863         /* deleted MCA's */
1864         pmc_prev = NULL;
1865         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1866                 pmc_next = pmc->next;
1867                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1868                         type = MLD2_BLOCK_OLD_SOURCES;
1869                         dtype = MLD2_BLOCK_OLD_SOURCES;
1870                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1871                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1872                 }
1873                 if (pmc->mca_crcount) {
1874                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1875                                 type = MLD2_CHANGE_TO_INCLUDE;
1876                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1877                         }
1878                         pmc->mca_crcount--;
1879                         if (pmc->mca_crcount == 0) {
1880                                 mld_clear_zeros(&pmc->mca_tomb);
1881                                 mld_clear_zeros(&pmc->mca_sources);
1882                         }
1883                 }
1884                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1885                     !pmc->mca_sources) {
1886                         if (pmc_prev)
1887                                 pmc_prev->next = pmc_next;
1888                         else
1889                                 idev->mc_tomb = pmc_next;
1890                         in6_dev_put(pmc->idev);
1891                         kfree(pmc);
1892                 } else
1893                         pmc_prev = pmc;
1894         }
1895         spin_unlock(&idev->mc_lock);
1896
1897         /* change recs */
1898         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1899                 spin_lock_bh(&pmc->mca_lock);
1900                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1901                         type = MLD2_BLOCK_OLD_SOURCES;
1902                         dtype = MLD2_ALLOW_NEW_SOURCES;
1903                 } else {
1904                         type = MLD2_ALLOW_NEW_SOURCES;
1905                         dtype = MLD2_BLOCK_OLD_SOURCES;
1906                 }
1907                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1908                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1909
1910                 /* filter mode changes */
1911                 if (pmc->mca_crcount) {
1912                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1913                                 type = MLD2_CHANGE_TO_EXCLUDE;
1914                         else
1915                                 type = MLD2_CHANGE_TO_INCLUDE;
1916                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1917                         pmc->mca_crcount--;
1918                 }
1919                 spin_unlock_bh(&pmc->mca_lock);
1920         }
1921         read_unlock_bh(&idev->lock);
1922         if (!skb)
1923                 return;
1924         (void) mld_sendpack(skb);
1925 }
1926
1927 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1928 {
1929         struct net *net = dev_net(dev);
1930         struct sock *sk = net->ipv6.igmp_sk;
1931         struct inet6_dev *idev;
1932         struct sk_buff *skb;
1933         struct mld_msg *hdr;
1934         const struct in6_addr *snd_addr, *saddr;
1935         struct in6_addr addr_buf;
1936         int hlen = LL_RESERVED_SPACE(dev);
1937         int tlen = dev->needed_tailroom;
1938         int err, len, payload_len, full_len;
1939         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1940                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1941                      IPV6_TLV_PADN, 0 };
1942         struct flowi6 fl6;
1943         struct dst_entry *dst;
1944
1945         if (type == ICMPV6_MGM_REDUCTION)
1946                 snd_addr = &in6addr_linklocal_allrouters;
1947         else
1948                 snd_addr = addr;
1949
1950         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1951         payload_len = len + sizeof(ra);
1952         full_len = sizeof(struct ipv6hdr) + payload_len;
1953
1954         rcu_read_lock();
1955         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1956                       IPSTATS_MIB_OUT, full_len);
1957         rcu_read_unlock();
1958
1959         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1960
1961         if (skb == NULL) {
1962                 rcu_read_lock();
1963                 IP6_INC_STATS(net, __in6_dev_get(dev),
1964                               IPSTATS_MIB_OUTDISCARDS);
1965                 rcu_read_unlock();
1966                 return;
1967         }
1968         skb->priority = TC_PRIO_CONTROL;
1969         skb_reserve(skb, hlen);
1970
1971         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1972                 /* <draft-ietf-magma-mld-source-05.txt>:
1973                  * use unspecified address as the source address
1974                  * when a valid link-local address is not available.
1975                  */
1976                 saddr = &in6addr_any;
1977         } else
1978                 saddr = &addr_buf;
1979
1980         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1981
1982         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1983
1984         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1985         memset(hdr, 0, sizeof(struct mld_msg));
1986         hdr->mld_type = type;
1987         hdr->mld_mca = *addr;
1988
1989         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1990                                          IPPROTO_ICMPV6,
1991                                          csum_partial(hdr, len, 0));
1992
1993         rcu_read_lock();
1994         idev = __in6_dev_get(skb->dev);
1995
1996         icmpv6_flow_init(sk, &fl6, type,
1997                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1998                          skb->dev->ifindex);
1999         dst = icmp6_dst_alloc(skb->dev, &fl6);
2000         if (IS_ERR(dst)) {
2001                 err = PTR_ERR(dst);
2002                 goto err_out;
2003         }
2004
2005         skb_dst_set(skb, dst);
2006         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
2007                       dst_output);
2008 out:
2009         if (!err) {
2010                 ICMP6MSGOUT_INC_STATS(net, idev, type);
2011                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2012                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
2013         } else
2014                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2015
2016         rcu_read_unlock();
2017         return;
2018
2019 err_out:
2020         kfree_skb(skb);
2021         goto out;
2022 }
2023
2024 static void mld_send_initial_cr(struct inet6_dev *idev)
2025 {
2026         struct sk_buff *skb;
2027         struct ifmcaddr6 *pmc;
2028         int type;
2029
2030         if (mld_in_v1_mode(idev))
2031                 return;
2032
2033         skb = NULL;
2034         read_lock_bh(&idev->lock);
2035         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2036                 spin_lock_bh(&pmc->mca_lock);
2037                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2038                         type = MLD2_CHANGE_TO_EXCLUDE;
2039                 else
2040                         type = MLD2_CHANGE_TO_INCLUDE;
2041                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2042                 spin_unlock_bh(&pmc->mca_lock);
2043         }
2044         read_unlock_bh(&idev->lock);
2045         if (skb)
2046                 mld_sendpack(skb);
2047 }
2048
2049 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2050 {
2051         idev->mc_dad_count = idev->mc_qrv;
2052         if (idev->mc_dad_count) {
2053                 mld_send_initial_cr(idev);
2054                 idev->mc_dad_count--;
2055                 if (idev->mc_dad_count)
2056                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2057         }
2058 }
2059
2060 static void mld_dad_timer_expire(unsigned long data)
2061 {
2062         struct inet6_dev *idev = (struct inet6_dev *)data;
2063
2064         mld_send_initial_cr(idev);
2065         if (idev->mc_dad_count) {
2066                 idev->mc_dad_count--;
2067                 if (idev->mc_dad_count)
2068                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2069         }
2070         in6_dev_put(idev);
2071 }
2072
2073 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2074         const struct in6_addr *psfsrc)
2075 {
2076         struct ip6_sf_list *psf, *psf_prev;
2077         int rv = 0;
2078
2079         psf_prev = NULL;
2080         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2081                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2082                         break;
2083                 psf_prev = psf;
2084         }
2085         if (!psf || psf->sf_count[sfmode] == 0) {
2086                 /* source filter not found, or count wrong =>  bug */
2087                 return -ESRCH;
2088         }
2089         psf->sf_count[sfmode]--;
2090         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2091                 struct inet6_dev *idev = pmc->idev;
2092
2093                 /* no more filters for this source */
2094                 if (psf_prev)
2095                         psf_prev->sf_next = psf->sf_next;
2096                 else
2097                         pmc->mca_sources = psf->sf_next;
2098                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2099                     !mld_in_v1_mode(idev)) {
2100                         psf->sf_crcount = idev->mc_qrv;
2101                         psf->sf_next = pmc->mca_tomb;
2102                         pmc->mca_tomb = psf;
2103                         rv = 1;
2104                 } else
2105                         kfree(psf);
2106         }
2107         return rv;
2108 }
2109
2110 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2111                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2112                           int delta)
2113 {
2114         struct ifmcaddr6 *pmc;
2115         int     changerec = 0;
2116         int     i, err;
2117
2118         if (!idev)
2119                 return -ENODEV;
2120         read_lock_bh(&idev->lock);
2121         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2122                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2123                         break;
2124         }
2125         if (!pmc) {
2126                 /* MCA not found?? bug */
2127                 read_unlock_bh(&idev->lock);
2128                 return -ESRCH;
2129         }
2130         spin_lock_bh(&pmc->mca_lock);
2131         sf_markstate(pmc);
2132         if (!delta) {
2133                 if (!pmc->mca_sfcount[sfmode]) {
2134                         spin_unlock_bh(&pmc->mca_lock);
2135                         read_unlock_bh(&idev->lock);
2136                         return -EINVAL;
2137                 }
2138                 pmc->mca_sfcount[sfmode]--;
2139         }
2140         err = 0;
2141         for (i=0; i<sfcount; i++) {
2142                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2143
2144                 changerec |= rv > 0;
2145                 if (!err && rv < 0)
2146                         err = rv;
2147         }
2148         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2149             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2150             pmc->mca_sfcount[MCAST_INCLUDE]) {
2151                 struct ip6_sf_list *psf;
2152
2153                 /* filter mode change */
2154                 pmc->mca_sfmode = MCAST_INCLUDE;
2155                 pmc->mca_crcount = idev->mc_qrv;
2156                 idev->mc_ifc_count = pmc->mca_crcount;
2157                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2158                         psf->sf_crcount = 0;
2159                 mld_ifc_event(pmc->idev);
2160         } else if (sf_setstate(pmc) || changerec)
2161                 mld_ifc_event(pmc->idev);
2162         spin_unlock_bh(&pmc->mca_lock);
2163         read_unlock_bh(&idev->lock);
2164         return err;
2165 }
2166
2167 /*
2168  * Add multicast single-source filter to the interface list
2169  */
2170 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2171         const struct in6_addr *psfsrc)
2172 {
2173         struct ip6_sf_list *psf, *psf_prev;
2174
2175         psf_prev = NULL;
2176         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2177                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2178                         break;
2179                 psf_prev = psf;
2180         }
2181         if (!psf) {
2182                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2183                 if (!psf)
2184                         return -ENOBUFS;
2185
2186                 psf->sf_addr = *psfsrc;
2187                 if (psf_prev) {
2188                         psf_prev->sf_next = psf;
2189                 } else
2190                         pmc->mca_sources = psf;
2191         }
2192         psf->sf_count[sfmode]++;
2193         return 0;
2194 }
2195
2196 static void sf_markstate(struct ifmcaddr6 *pmc)
2197 {
2198         struct ip6_sf_list *psf;
2199         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2200
2201         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2202                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2203                         psf->sf_oldin = mca_xcount ==
2204                                 psf->sf_count[MCAST_EXCLUDE] &&
2205                                 !psf->sf_count[MCAST_INCLUDE];
2206                 } else
2207                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2208 }
2209
2210 static int sf_setstate(struct ifmcaddr6 *pmc)
2211 {
2212         struct ip6_sf_list *psf, *dpsf;
2213         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2214         int qrv = pmc->idev->mc_qrv;
2215         int new_in, rv;
2216
2217         rv = 0;
2218         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2219                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2220                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2221                                 !psf->sf_count[MCAST_INCLUDE];
2222                 } else
2223                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2224                 if (new_in) {
2225                         if (!psf->sf_oldin) {
2226                                 struct ip6_sf_list *prev = NULL;
2227
2228                                 for (dpsf=pmc->mca_tomb; dpsf;
2229                                      dpsf=dpsf->sf_next) {
2230                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2231                                             &psf->sf_addr))
2232                                                 break;
2233                                         prev = dpsf;
2234                                 }
2235                                 if (dpsf) {
2236                                         if (prev)
2237                                                 prev->sf_next = dpsf->sf_next;
2238                                         else
2239                                                 pmc->mca_tomb = dpsf->sf_next;
2240                                         kfree(dpsf);
2241                                 }
2242                                 psf->sf_crcount = qrv;
2243                                 rv++;
2244                         }
2245                 } else if (psf->sf_oldin) {
2246                         psf->sf_crcount = 0;
2247                         /*
2248                          * add or update "delete" records if an active filter
2249                          * is now inactive
2250                          */
2251                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2252                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2253                                     &psf->sf_addr))
2254                                         break;
2255                         if (!dpsf) {
2256                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2257                                 if (!dpsf)
2258                                         continue;
2259                                 *dpsf = *psf;
2260                                 /* pmc->mca_lock held by callers */
2261                                 dpsf->sf_next = pmc->mca_tomb;
2262                                 pmc->mca_tomb = dpsf;
2263                         }
2264                         dpsf->sf_crcount = qrv;
2265                         rv++;
2266                 }
2267         }
2268         return rv;
2269 }
2270
2271 /*
2272  * Add multicast source filter list to the interface list
2273  */
2274 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2275                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2276                           int delta)
2277 {
2278         struct ifmcaddr6 *pmc;
2279         int     isexclude;
2280         int     i, err;
2281
2282         if (!idev)
2283                 return -ENODEV;
2284         read_lock_bh(&idev->lock);
2285         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2286                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2287                         break;
2288         }
2289         if (!pmc) {
2290                 /* MCA not found?? bug */
2291                 read_unlock_bh(&idev->lock);
2292                 return -ESRCH;
2293         }
2294         spin_lock_bh(&pmc->mca_lock);
2295
2296         sf_markstate(pmc);
2297         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2298         if (!delta)
2299                 pmc->mca_sfcount[sfmode]++;
2300         err = 0;
2301         for (i=0; i<sfcount; i++) {
2302                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2303                 if (err)
2304                         break;
2305         }
2306         if (err) {
2307                 int j;
2308
2309                 if (!delta)
2310                         pmc->mca_sfcount[sfmode]--;
2311                 for (j=0; j<i; j++)
2312                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2313         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2314                 struct ip6_sf_list *psf;
2315
2316                 /* filter mode change */
2317                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2318                         pmc->mca_sfmode = MCAST_EXCLUDE;
2319                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2320                         pmc->mca_sfmode = MCAST_INCLUDE;
2321                 /* else no filters; keep old mode for reports */
2322
2323                 pmc->mca_crcount = idev->mc_qrv;
2324                 idev->mc_ifc_count = pmc->mca_crcount;
2325                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2326                         psf->sf_crcount = 0;
2327                 mld_ifc_event(idev);
2328         } else if (sf_setstate(pmc))
2329                 mld_ifc_event(idev);
2330         spin_unlock_bh(&pmc->mca_lock);
2331         read_unlock_bh(&idev->lock);
2332         return err;
2333 }
2334
2335 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2336 {
2337         struct ip6_sf_list *psf, *nextpsf;
2338
2339         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2340                 nextpsf = psf->sf_next;
2341                 kfree(psf);
2342         }
2343         pmc->mca_tomb = NULL;
2344         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2345                 nextpsf = psf->sf_next;
2346                 kfree(psf);
2347         }
2348         pmc->mca_sources = NULL;
2349         pmc->mca_sfmode = MCAST_EXCLUDE;
2350         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2351         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2352 }
2353
2354
2355 static void igmp6_join_group(struct ifmcaddr6 *ma)
2356 {
2357         unsigned long delay;
2358
2359         if (ma->mca_flags & MAF_NOREPORT)
2360                 return;
2361
2362         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2363
2364         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2365
2366         spin_lock_bh(&ma->mca_lock);
2367         if (del_timer(&ma->mca_timer)) {
2368                 atomic_dec(&ma->mca_refcnt);
2369                 delay = ma->mca_timer.expires - jiffies;
2370         }
2371
2372         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2373                 atomic_inc(&ma->mca_refcnt);
2374         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2375         spin_unlock_bh(&ma->mca_lock);
2376 }
2377
2378 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2379                             struct inet6_dev *idev)
2380 {
2381         int err;
2382
2383         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2384          * so no other readers or writers of iml or its sflist
2385          */
2386         if (!iml->sflist) {
2387                 /* any-source empty exclude case */
2388                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2389         }
2390         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2391                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2392         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2393         iml->sflist = NULL;
2394         return err;
2395 }
2396
2397 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2398 {
2399         if (mld_in_v1_mode(ma->idev)) {
2400                 if (ma->mca_flags & MAF_LAST_REPORTER)
2401                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2402                                 ICMPV6_MGM_REDUCTION);
2403         } else {
2404                 mld_add_delrec(ma->idev, ma);
2405                 mld_ifc_event(ma->idev);
2406         }
2407 }
2408
2409 static void mld_gq_timer_expire(unsigned long data)
2410 {
2411         struct inet6_dev *idev = (struct inet6_dev *)data;
2412
2413         idev->mc_gq_running = 0;
2414         mld_send_report(idev, NULL);
2415         in6_dev_put(idev);
2416 }
2417
2418 static void mld_ifc_timer_expire(unsigned long data)
2419 {
2420         struct inet6_dev *idev = (struct inet6_dev *)data;
2421
2422         mld_send_cr(idev);
2423         if (idev->mc_ifc_count) {
2424                 idev->mc_ifc_count--;
2425                 if (idev->mc_ifc_count)
2426                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2427         }
2428         in6_dev_put(idev);
2429 }
2430
2431 static void mld_ifc_event(struct inet6_dev *idev)
2432 {
2433         if (mld_in_v1_mode(idev))
2434                 return;
2435         idev->mc_ifc_count = idev->mc_qrv;
2436         mld_ifc_start_timer(idev, 1);
2437 }
2438
2439
2440 static void igmp6_timer_handler(unsigned long data)
2441 {
2442         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2443
2444         if (mld_in_v1_mode(ma->idev))
2445                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2446         else
2447                 mld_send_report(ma->idev, ma);
2448
2449         spin_lock(&ma->mca_lock);
2450         ma->mca_flags |=  MAF_LAST_REPORTER;
2451         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2452         spin_unlock(&ma->mca_lock);
2453         ma_put(ma);
2454 }
2455
2456 /* Device changing type */
2457
2458 void ipv6_mc_unmap(struct inet6_dev *idev)
2459 {
2460         struct ifmcaddr6 *i;
2461
2462         /* Install multicast list, except for all-nodes (already installed) */
2463
2464         read_lock_bh(&idev->lock);
2465         for (i = idev->mc_list; i; i = i->next)
2466                 igmp6_group_dropped(i);
2467         read_unlock_bh(&idev->lock);
2468 }
2469
2470 void ipv6_mc_remap(struct inet6_dev *idev)
2471 {
2472         ipv6_mc_up(idev);
2473 }
2474
2475 /* Device going down */
2476
2477 void ipv6_mc_down(struct inet6_dev *idev)
2478 {
2479         struct ifmcaddr6 *i;
2480
2481         /* Withdraw multicast list */
2482
2483         read_lock_bh(&idev->lock);
2484         mld_ifc_stop_timer(idev);
2485         mld_gq_stop_timer(idev);
2486         mld_dad_stop_timer(idev);
2487
2488         for (i = idev->mc_list; i; i=i->next)
2489                 igmp6_group_dropped(i);
2490         read_unlock_bh(&idev->lock);
2491
2492         mld_clear_delrec(idev);
2493 }
2494
2495
2496 /* Device going up */
2497
2498 void ipv6_mc_up(struct inet6_dev *idev)
2499 {
2500         struct ifmcaddr6 *i;
2501
2502         /* Install multicast list, except for all-nodes (already installed) */
2503
2504         read_lock_bh(&idev->lock);
2505         for (i = idev->mc_list; i; i=i->next)
2506                 igmp6_group_added(i);
2507         read_unlock_bh(&idev->lock);
2508 }
2509
2510 /* IPv6 device initialization. */
2511
2512 void ipv6_mc_init_dev(struct inet6_dev *idev)
2513 {
2514         write_lock_bh(&idev->lock);
2515         spin_lock_init(&idev->mc_lock);
2516         idev->mc_gq_running = 0;
2517         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2518                         (unsigned long)idev);
2519         idev->mc_tomb = NULL;
2520         idev->mc_ifc_count = 0;
2521         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2522                         (unsigned long)idev);
2523         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2524                     (unsigned long)idev);
2525
2526         idev->mc_qrv = MLD_QRV_DEFAULT;
2527         idev->mc_qi = MLD_QI_DEFAULT;
2528         idev->mc_qri = MLD_QRI_DEFAULT;
2529
2530         idev->mc_maxdelay = unsolicited_report_interval(idev);
2531         idev->mc_v1_seen = 0;
2532         write_unlock_bh(&idev->lock);
2533 }
2534
2535 /*
2536  *      Device is about to be destroyed: clean up.
2537  */
2538
2539 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2540 {
2541         struct ifmcaddr6 *i;
2542
2543         /* Deactivate timers */
2544         ipv6_mc_down(idev);
2545
2546         /* Delete all-nodes address. */
2547         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2548          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2549          * fail.
2550          */
2551         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2552
2553         if (idev->cnf.forwarding)
2554                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2555
2556         write_lock_bh(&idev->lock);
2557         while ((i = idev->mc_list) != NULL) {
2558                 idev->mc_list = i->next;
2559                 write_unlock_bh(&idev->lock);
2560
2561                 igmp6_group_dropped(i);
2562                 ma_put(i);
2563
2564                 write_lock_bh(&idev->lock);
2565         }
2566         write_unlock_bh(&idev->lock);
2567 }
2568
2569 #ifdef CONFIG_PROC_FS
2570 struct igmp6_mc_iter_state {
2571         struct seq_net_private p;
2572         struct net_device *dev;
2573         struct inet6_dev *idev;
2574 };
2575
2576 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2577
2578 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2579 {
2580         struct ifmcaddr6 *im = NULL;
2581         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2582         struct net *net = seq_file_net(seq);
2583
2584         state->idev = NULL;
2585         for_each_netdev_rcu(net, state->dev) {
2586                 struct inet6_dev *idev;
2587                 idev = __in6_dev_get(state->dev);
2588                 if (!idev)
2589                         continue;
2590                 read_lock_bh(&idev->lock);
2591                 im = idev->mc_list;
2592                 if (im) {
2593                         state->idev = idev;
2594                         break;
2595                 }
2596                 read_unlock_bh(&idev->lock);
2597         }
2598         return im;
2599 }
2600
2601 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2602 {
2603         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2604
2605         im = im->next;
2606         while (!im) {
2607                 if (likely(state->idev != NULL))
2608                         read_unlock_bh(&state->idev->lock);
2609
2610                 state->dev = next_net_device_rcu(state->dev);
2611                 if (!state->dev) {
2612                         state->idev = NULL;
2613                         break;
2614                 }
2615                 state->idev = __in6_dev_get(state->dev);
2616                 if (!state->idev)
2617                         continue;
2618                 read_lock_bh(&state->idev->lock);
2619                 im = state->idev->mc_list;
2620         }
2621         return im;
2622 }
2623
2624 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2625 {
2626         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2627         if (im)
2628                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2629                         --pos;
2630         return pos ? NULL : im;
2631 }
2632
2633 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2634         __acquires(RCU)
2635 {
2636         rcu_read_lock();
2637         return igmp6_mc_get_idx(seq, *pos);
2638 }
2639
2640 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2641 {
2642         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2643
2644         ++*pos;
2645         return im;
2646 }
2647
2648 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2649         __releases(RCU)
2650 {
2651         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2652
2653         if (likely(state->idev != NULL)) {
2654                 read_unlock_bh(&state->idev->lock);
2655                 state->idev = NULL;
2656         }
2657         state->dev = NULL;
2658         rcu_read_unlock();
2659 }
2660
2661 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2662 {
2663         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2664         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2665
2666         seq_printf(seq,
2667                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2668                    state->dev->ifindex, state->dev->name,
2669                    &im->mca_addr,
2670                    im->mca_users, im->mca_flags,
2671                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2672                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2673         return 0;
2674 }
2675
2676 static const struct seq_operations igmp6_mc_seq_ops = {
2677         .start  =       igmp6_mc_seq_start,
2678         .next   =       igmp6_mc_seq_next,
2679         .stop   =       igmp6_mc_seq_stop,
2680         .show   =       igmp6_mc_seq_show,
2681 };
2682
2683 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2684 {
2685         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2686                             sizeof(struct igmp6_mc_iter_state));
2687 }
2688
2689 static const struct file_operations igmp6_mc_seq_fops = {
2690         .owner          =       THIS_MODULE,
2691         .open           =       igmp6_mc_seq_open,
2692         .read           =       seq_read,
2693         .llseek         =       seq_lseek,
2694         .release        =       seq_release_net,
2695 };
2696
2697 struct igmp6_mcf_iter_state {
2698         struct seq_net_private p;
2699         struct net_device *dev;
2700         struct inet6_dev *idev;
2701         struct ifmcaddr6 *im;
2702 };
2703
2704 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2705
2706 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2707 {
2708         struct ip6_sf_list *psf = NULL;
2709         struct ifmcaddr6 *im = NULL;
2710         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2711         struct net *net = seq_file_net(seq);
2712
2713         state->idev = NULL;
2714         state->im = NULL;
2715         for_each_netdev_rcu(net, state->dev) {
2716                 struct inet6_dev *idev;
2717                 idev = __in6_dev_get(state->dev);
2718                 if (unlikely(idev == NULL))
2719                         continue;
2720                 read_lock_bh(&idev->lock);
2721                 im = idev->mc_list;
2722                 if (likely(im != NULL)) {
2723                         spin_lock_bh(&im->mca_lock);
2724                         psf = im->mca_sources;
2725                         if (likely(psf != NULL)) {
2726                                 state->im = im;
2727                                 state->idev = idev;
2728                                 break;
2729                         }
2730                         spin_unlock_bh(&im->mca_lock);
2731                 }
2732                 read_unlock_bh(&idev->lock);
2733         }
2734         return psf;
2735 }
2736
2737 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2738 {
2739         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2740
2741         psf = psf->sf_next;
2742         while (!psf) {
2743                 spin_unlock_bh(&state->im->mca_lock);
2744                 state->im = state->im->next;
2745                 while (!state->im) {
2746                         if (likely(state->idev != NULL))
2747                                 read_unlock_bh(&state->idev->lock);
2748
2749                         state->dev = next_net_device_rcu(state->dev);
2750                         if (!state->dev) {
2751                                 state->idev = NULL;
2752                                 goto out;
2753                         }
2754                         state->idev = __in6_dev_get(state->dev);
2755                         if (!state->idev)
2756                                 continue;
2757                         read_lock_bh(&state->idev->lock);
2758                         state->im = state->idev->mc_list;
2759                 }
2760                 if (!state->im)
2761                         break;
2762                 spin_lock_bh(&state->im->mca_lock);
2763                 psf = state->im->mca_sources;
2764         }
2765 out:
2766         return psf;
2767 }
2768
2769 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2770 {
2771         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2772         if (psf)
2773                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2774                         --pos;
2775         return pos ? NULL : psf;
2776 }
2777
2778 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2779         __acquires(RCU)
2780 {
2781         rcu_read_lock();
2782         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2783 }
2784
2785 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2786 {
2787         struct ip6_sf_list *psf;
2788         if (v == SEQ_START_TOKEN)
2789                 psf = igmp6_mcf_get_first(seq);
2790         else
2791                 psf = igmp6_mcf_get_next(seq, v);
2792         ++*pos;
2793         return psf;
2794 }
2795
2796 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2797         __releases(RCU)
2798 {
2799         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2800         if (likely(state->im != NULL)) {
2801                 spin_unlock_bh(&state->im->mca_lock);
2802                 state->im = NULL;
2803         }
2804         if (likely(state->idev != NULL)) {
2805                 read_unlock_bh(&state->idev->lock);
2806                 state->idev = NULL;
2807         }
2808         state->dev = NULL;
2809         rcu_read_unlock();
2810 }
2811
2812 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2813 {
2814         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2815         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2816
2817         if (v == SEQ_START_TOKEN) {
2818                 seq_printf(seq,
2819                            "%3s %6s "
2820                            "%32s %32s %6s %6s\n", "Idx",
2821                            "Device", "Multicast Address",
2822                            "Source Address", "INC", "EXC");
2823         } else {
2824                 seq_printf(seq,
2825                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2826                            state->dev->ifindex, state->dev->name,
2827                            &state->im->mca_addr,
2828                            &psf->sf_addr,
2829                            psf->sf_count[MCAST_INCLUDE],
2830                            psf->sf_count[MCAST_EXCLUDE]);
2831         }
2832         return 0;
2833 }
2834
2835 static const struct seq_operations igmp6_mcf_seq_ops = {
2836         .start  =       igmp6_mcf_seq_start,
2837         .next   =       igmp6_mcf_seq_next,
2838         .stop   =       igmp6_mcf_seq_stop,
2839         .show   =       igmp6_mcf_seq_show,
2840 };
2841
2842 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2843 {
2844         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2845                             sizeof(struct igmp6_mcf_iter_state));
2846 }
2847
2848 static const struct file_operations igmp6_mcf_seq_fops = {
2849         .owner          =       THIS_MODULE,
2850         .open           =       igmp6_mcf_seq_open,
2851         .read           =       seq_read,
2852         .llseek         =       seq_lseek,
2853         .release        =       seq_release_net,
2854 };
2855
2856 static int __net_init igmp6_proc_init(struct net *net)
2857 {
2858         int err;
2859
2860         err = -ENOMEM;
2861         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2862                 goto out;
2863         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2864                          &igmp6_mcf_seq_fops))
2865                 goto out_proc_net_igmp6;
2866
2867         err = 0;
2868 out:
2869         return err;
2870
2871 out_proc_net_igmp6:
2872         remove_proc_entry("igmp6", net->proc_net);
2873         goto out;
2874 }
2875
2876 static void __net_exit igmp6_proc_exit(struct net *net)
2877 {
2878         remove_proc_entry("mcfilter6", net->proc_net);
2879         remove_proc_entry("igmp6", net->proc_net);
2880 }
2881 #else
2882 static inline int igmp6_proc_init(struct net *net)
2883 {
2884         return 0;
2885 }
2886 static inline void igmp6_proc_exit(struct net *net)
2887 {
2888 }
2889 #endif
2890
2891 static int __net_init igmp6_net_init(struct net *net)
2892 {
2893         int err;
2894
2895         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2896                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2897         if (err < 0) {
2898                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2899                        err);
2900                 goto out;
2901         }
2902
2903         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2904
2905         err = igmp6_proc_init(net);
2906         if (err)
2907                 goto out_sock_create;
2908 out:
2909         return err;
2910
2911 out_sock_create:
2912         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2913         goto out;
2914 }
2915
2916 static void __net_exit igmp6_net_exit(struct net *net)
2917 {
2918         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2919         igmp6_proc_exit(net);
2920 }
2921
2922 static struct pernet_operations igmp6_net_ops = {
2923         .init = igmp6_net_init,
2924         .exit = igmp6_net_exit,
2925 };
2926
2927 int __init igmp6_init(void)
2928 {
2929         return register_pernet_subsys(&igmp6_net_ops);
2930 }
2931
2932 void igmp6_cleanup(void)
2933 {
2934         unregister_pernet_subsys(&igmp6_net_ops);
2935 }