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         /* Drop queries with not link local source */
1319         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1320                 return -EINVAL;
1321
1322         idev = __in6_dev_get(skb->dev);
1323         if (idev == NULL)
1324                 return 0;
1325
1326         mld = (struct mld_msg *)icmp6_hdr(skb);
1327         group = &mld->mld_mca;
1328         group_type = ipv6_addr_type(group);
1329
1330         if (group_type != IPV6_ADDR_ANY &&
1331             !(group_type&IPV6_ADDR_MULTICAST))
1332                 return -EINVAL;
1333
1334         if (len == MLD_V1_QUERY_LEN) {
1335                 err = mld_process_v1(idev, mld, &max_delay);
1336                 if (err < 0)
1337                         return err;
1338         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1339                 int srcs_offset = sizeof(struct mld2_query) -
1340                                   sizeof(struct icmp6hdr);
1341
1342                 if (!pskb_may_pull(skb, srcs_offset))
1343                         return -EINVAL;
1344
1345                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1346
1347                 err = mld_process_v2(idev, mlh2, &max_delay);
1348                 if (err < 0)
1349                         return err;
1350
1351                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1352                         if (mlh2->mld2q_nsrcs)
1353                                 return -EINVAL; /* no sources allowed */
1354
1355                         mld_gq_start_timer(idev);
1356                         return 0;
1357                 }
1358                 /* mark sources to include, if group & source-specific */
1359                 if (mlh2->mld2q_nsrcs != 0) {
1360                         if (!pskb_may_pull(skb, srcs_offset +
1361                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1362                                 return -EINVAL;
1363
1364                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1365                         mark = 1;
1366                 }
1367         } else
1368                 return -EINVAL;
1369
1370         read_lock_bh(&idev->lock);
1371         if (group_type == IPV6_ADDR_ANY) {
1372                 for (ma = idev->mc_list; ma; ma=ma->next) {
1373                         spin_lock_bh(&ma->mca_lock);
1374                         igmp6_group_queried(ma, max_delay);
1375                         spin_unlock_bh(&ma->mca_lock);
1376                 }
1377         } else {
1378                 for (ma = idev->mc_list; ma; ma=ma->next) {
1379                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1380                                 continue;
1381                         spin_lock_bh(&ma->mca_lock);
1382                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1383                                 /* gsquery <- gsquery && mark */
1384                                 if (!mark)
1385                                         ma->mca_flags &= ~MAF_GSQUERY;
1386                         } else {
1387                                 /* gsquery <- mark */
1388                                 if (mark)
1389                                         ma->mca_flags |= MAF_GSQUERY;
1390                                 else
1391                                         ma->mca_flags &= ~MAF_GSQUERY;
1392                         }
1393                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1394                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1395                                 igmp6_group_queried(ma, max_delay);
1396                         spin_unlock_bh(&ma->mca_lock);
1397                         break;
1398                 }
1399         }
1400         read_unlock_bh(&idev->lock);
1401
1402         return 0;
1403 }
1404
1405 /* called with rcu_read_lock() */
1406 int igmp6_event_report(struct sk_buff *skb)
1407 {
1408         struct ifmcaddr6 *ma;
1409         struct inet6_dev *idev;
1410         struct mld_msg *mld;
1411         int addr_type;
1412
1413         /* Our own report looped back. Ignore it. */
1414         if (skb->pkt_type == PACKET_LOOPBACK)
1415                 return 0;
1416
1417         /* send our report if the MC router may not have heard this report */
1418         if (skb->pkt_type != PACKET_MULTICAST &&
1419             skb->pkt_type != PACKET_BROADCAST)
1420                 return 0;
1421
1422         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1423                 return -EINVAL;
1424
1425         mld = (struct mld_msg *)icmp6_hdr(skb);
1426
1427         /* Drop reports with not link local source */
1428         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1429         if (addr_type != IPV6_ADDR_ANY &&
1430             !(addr_type&IPV6_ADDR_LINKLOCAL))
1431                 return -EINVAL;
1432
1433         idev = __in6_dev_get(skb->dev);
1434         if (idev == NULL)
1435                 return -ENODEV;
1436
1437         /*
1438          *      Cancel the timer for this group
1439          */
1440
1441         read_lock_bh(&idev->lock);
1442         for (ma = idev->mc_list; ma; ma=ma->next) {
1443                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1444                         spin_lock(&ma->mca_lock);
1445                         if (del_timer(&ma->mca_timer))
1446                                 atomic_dec(&ma->mca_refcnt);
1447                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1448                         spin_unlock(&ma->mca_lock);
1449                         break;
1450                 }
1451         }
1452         read_unlock_bh(&idev->lock);
1453         return 0;
1454 }
1455
1456 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1457                   int gdeleted, int sdeleted)
1458 {
1459         switch (type) {
1460         case MLD2_MODE_IS_INCLUDE:
1461         case MLD2_MODE_IS_EXCLUDE:
1462                 if (gdeleted || sdeleted)
1463                         return false;
1464                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1465                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1466                                 return true;
1467                         /* don't include if this source is excluded
1468                          * in all filters
1469                          */
1470                         if (psf->sf_count[MCAST_INCLUDE])
1471                                 return type == MLD2_MODE_IS_INCLUDE;
1472                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1473                                 psf->sf_count[MCAST_EXCLUDE];
1474                 }
1475                 return false;
1476         case MLD2_CHANGE_TO_INCLUDE:
1477                 if (gdeleted || sdeleted)
1478                         return false;
1479                 return psf->sf_count[MCAST_INCLUDE] != 0;
1480         case MLD2_CHANGE_TO_EXCLUDE:
1481                 if (gdeleted || sdeleted)
1482                         return false;
1483                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1484                     psf->sf_count[MCAST_INCLUDE])
1485                         return false;
1486                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1487                         psf->sf_count[MCAST_EXCLUDE];
1488         case MLD2_ALLOW_NEW_SOURCES:
1489                 if (gdeleted || !psf->sf_crcount)
1490                         return false;
1491                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1492         case MLD2_BLOCK_OLD_SOURCES:
1493                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1494                         return gdeleted || (psf->sf_crcount && sdeleted);
1495                 return psf->sf_crcount && !gdeleted && !sdeleted;
1496         }
1497         return false;
1498 }
1499
1500 static int
1501 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1502 {
1503         struct ip6_sf_list *psf;
1504         int scount = 0;
1505
1506         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1507                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1508                         continue;
1509                 scount++;
1510         }
1511         return scount;
1512 }
1513
1514 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1515                        struct net_device *dev,
1516                        const struct in6_addr *saddr,
1517                        const struct in6_addr *daddr,
1518                        int proto, int len)
1519 {
1520         struct ipv6hdr *hdr;
1521
1522         skb->protocol = htons(ETH_P_IPV6);
1523         skb->dev = dev;
1524
1525         skb_reset_network_header(skb);
1526         skb_put(skb, sizeof(struct ipv6hdr));
1527         hdr = ipv6_hdr(skb);
1528
1529         ip6_flow_hdr(hdr, 0, 0);
1530
1531         hdr->payload_len = htons(len);
1532         hdr->nexthdr = proto;
1533         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1534
1535         hdr->saddr = *saddr;
1536         hdr->daddr = *daddr;
1537 }
1538
1539 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1540 {
1541         struct net_device *dev = idev->dev;
1542         struct net *net = dev_net(dev);
1543         struct sock *sk = net->ipv6.igmp_sk;
1544         struct sk_buff *skb;
1545         struct mld2_report *pmr;
1546         struct in6_addr addr_buf;
1547         const struct in6_addr *saddr;
1548         int hlen = LL_RESERVED_SPACE(dev);
1549         int tlen = dev->needed_tailroom;
1550         int err;
1551         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1552                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1553                      IPV6_TLV_PADN, 0 };
1554
1555         /* we assume size > sizeof(ra) here */
1556         size += hlen + tlen;
1557         /* limit our allocations to order-0 page */
1558         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1559         skb = sock_alloc_send_skb(sk, size, 1, &err);
1560
1561         if (!skb)
1562                 return NULL;
1563
1564         skb->priority = TC_PRIO_CONTROL;
1565         skb_reserve(skb, hlen);
1566
1567         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1568                 /* <draft-ietf-magma-mld-source-05.txt>:
1569                  * use unspecified address as the source address
1570                  * when a valid link-local address is not available.
1571                  */
1572                 saddr = &in6addr_any;
1573         } else
1574                 saddr = &addr_buf;
1575
1576         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1577
1578         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1579
1580         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1581         skb_put(skb, sizeof(*pmr));
1582         pmr = (struct mld2_report *)skb_transport_header(skb);
1583         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1584         pmr->mld2r_resv1 = 0;
1585         pmr->mld2r_cksum = 0;
1586         pmr->mld2r_resv2 = 0;
1587         pmr->mld2r_ngrec = 0;
1588         return skb;
1589 }
1590
1591 static void mld_sendpack(struct sk_buff *skb)
1592 {
1593         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1594         struct mld2_report *pmr =
1595                               (struct mld2_report *)skb_transport_header(skb);
1596         int payload_len, mldlen;
1597         struct inet6_dev *idev;
1598         struct net *net = dev_net(skb->dev);
1599         int err;
1600         struct flowi6 fl6;
1601         struct dst_entry *dst;
1602
1603         rcu_read_lock();
1604         idev = __in6_dev_get(skb->dev);
1605         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1606
1607         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1608                 sizeof(*pip6);
1609         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1610         pip6->payload_len = htons(payload_len);
1611
1612         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1613                                            IPPROTO_ICMPV6,
1614                                            csum_partial(skb_transport_header(skb),
1615                                                         mldlen, 0));
1616
1617         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1618                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1619                          skb->dev->ifindex);
1620         dst = icmp6_dst_alloc(skb->dev, &fl6);
1621
1622         err = 0;
1623         if (IS_ERR(dst)) {
1624                 err = PTR_ERR(dst);
1625                 dst = NULL;
1626         }
1627         skb_dst_set(skb, dst);
1628         if (err)
1629                 goto err_out;
1630
1631         payload_len = skb->len;
1632
1633         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1634                       dst_output);
1635 out:
1636         if (!err) {
1637                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1638                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1639                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1640         } else {
1641                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1642         }
1643
1644         rcu_read_unlock();
1645         return;
1646
1647 err_out:
1648         kfree_skb(skb);
1649         goto out;
1650 }
1651
1652 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1653 {
1654         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1655 }
1656
1657 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1658         int type, struct mld2_grec **ppgr)
1659 {
1660         struct net_device *dev = pmc->idev->dev;
1661         struct mld2_report *pmr;
1662         struct mld2_grec *pgr;
1663
1664         if (!skb)
1665                 skb = mld_newpack(pmc->idev, dev->mtu);
1666         if (!skb)
1667                 return NULL;
1668         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1669         pgr->grec_type = type;
1670         pgr->grec_auxwords = 0;
1671         pgr->grec_nsrcs = 0;
1672         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1673         pmr = (struct mld2_report *)skb_transport_header(skb);
1674         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1675         *ppgr = pgr;
1676         return skb;
1677 }
1678
1679 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1680         skb_tailroom(skb)) : 0)
1681
1682 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1683         int type, int gdeleted, int sdeleted, int crsend)
1684 {
1685         struct inet6_dev *idev = pmc->idev;
1686         struct net_device *dev = idev->dev;
1687         struct mld2_report *pmr;
1688         struct mld2_grec *pgr = NULL;
1689         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1690         int scount, stotal, first, isquery, truncate;
1691
1692         if (pmc->mca_flags & MAF_NOREPORT)
1693                 return skb;
1694
1695         isquery = type == MLD2_MODE_IS_INCLUDE ||
1696                   type == MLD2_MODE_IS_EXCLUDE;
1697         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1698                     type == MLD2_CHANGE_TO_EXCLUDE;
1699
1700         stotal = scount = 0;
1701
1702         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1703
1704         if (!*psf_list)
1705                 goto empty_source;
1706
1707         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1708
1709         /* EX and TO_EX get a fresh packet, if needed */
1710         if (truncate) {
1711                 if (pmr && pmr->mld2r_ngrec &&
1712                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1713                         if (skb)
1714                                 mld_sendpack(skb);
1715                         skb = mld_newpack(idev, dev->mtu);
1716                 }
1717         }
1718         first = 1;
1719         psf_prev = NULL;
1720         for (psf=*psf_list; psf; psf=psf_next) {
1721                 struct in6_addr *psrc;
1722
1723                 psf_next = psf->sf_next;
1724
1725                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1726                         psf_prev = psf;
1727                         continue;
1728                 }
1729
1730                 /* clear marks on query responses */
1731                 if (isquery)
1732                         psf->sf_gsresp = 0;
1733
1734                 if (AVAILABLE(skb) < sizeof(*psrc) +
1735                     first*sizeof(struct mld2_grec)) {
1736                         if (truncate && !first)
1737                                 break;   /* truncate these */
1738                         if (pgr)
1739                                 pgr->grec_nsrcs = htons(scount);
1740                         if (skb)
1741                                 mld_sendpack(skb);
1742                         skb = mld_newpack(idev, dev->mtu);
1743                         first = 1;
1744                         scount = 0;
1745                 }
1746                 if (first) {
1747                         skb = add_grhead(skb, pmc, type, &pgr);
1748                         first = 0;
1749                 }
1750                 if (!skb)
1751                         return NULL;
1752                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1753                 *psrc = psf->sf_addr;
1754                 scount++; stotal++;
1755                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1756                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1757                         psf->sf_crcount--;
1758                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1759                                 if (psf_prev)
1760                                         psf_prev->sf_next = psf->sf_next;
1761                                 else
1762                                         *psf_list = psf->sf_next;
1763                                 kfree(psf);
1764                                 continue;
1765                         }
1766                 }
1767                 psf_prev = psf;
1768         }
1769
1770 empty_source:
1771         if (!stotal) {
1772                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1773                     type == MLD2_BLOCK_OLD_SOURCES)
1774                         return skb;
1775                 if (pmc->mca_crcount || isquery || crsend) {
1776                         /* make sure we have room for group header */
1777                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1778                                 mld_sendpack(skb);
1779                                 skb = NULL; /* add_grhead will get a new one */
1780                         }
1781                         skb = add_grhead(skb, pmc, type, &pgr);
1782                 }
1783         }
1784         if (pgr)
1785                 pgr->grec_nsrcs = htons(scount);
1786
1787         if (isquery)
1788                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1789         return skb;
1790 }
1791
1792 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1793 {
1794         struct sk_buff *skb = NULL;
1795         int type;
1796
1797         read_lock_bh(&idev->lock);
1798         if (!pmc) {
1799                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1800                         if (pmc->mca_flags & MAF_NOREPORT)
1801                                 continue;
1802                         spin_lock_bh(&pmc->mca_lock);
1803                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1804                                 type = MLD2_MODE_IS_EXCLUDE;
1805                         else
1806                                 type = MLD2_MODE_IS_INCLUDE;
1807                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1808                         spin_unlock_bh(&pmc->mca_lock);
1809                 }
1810         } else {
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         read_unlock_bh(&idev->lock);
1820         if (skb)
1821                 mld_sendpack(skb);
1822 }
1823
1824 /*
1825  * remove zero-count source records from a source filter list
1826  */
1827 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1828 {
1829         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1830
1831         psf_prev = NULL;
1832         for (psf=*ppsf; psf; psf = psf_next) {
1833                 psf_next = psf->sf_next;
1834                 if (psf->sf_crcount == 0) {
1835                         if (psf_prev)
1836                                 psf_prev->sf_next = psf->sf_next;
1837                         else
1838                                 *ppsf = psf->sf_next;
1839                         kfree(psf);
1840                 } else
1841                         psf_prev = psf;
1842         }
1843 }
1844
1845 static void mld_send_cr(struct inet6_dev *idev)
1846 {
1847         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1848         struct sk_buff *skb = NULL;
1849         int type, dtype;
1850
1851         read_lock_bh(&idev->lock);
1852         spin_lock(&idev->mc_lock);
1853
1854         /* deleted MCA's */
1855         pmc_prev = NULL;
1856         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1857                 pmc_next = pmc->next;
1858                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1859                         type = MLD2_BLOCK_OLD_SOURCES;
1860                         dtype = MLD2_BLOCK_OLD_SOURCES;
1861                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1862                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1863                 }
1864                 if (pmc->mca_crcount) {
1865                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1866                                 type = MLD2_CHANGE_TO_INCLUDE;
1867                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1868                         }
1869                         pmc->mca_crcount--;
1870                         if (pmc->mca_crcount == 0) {
1871                                 mld_clear_zeros(&pmc->mca_tomb);
1872                                 mld_clear_zeros(&pmc->mca_sources);
1873                         }
1874                 }
1875                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1876                     !pmc->mca_sources) {
1877                         if (pmc_prev)
1878                                 pmc_prev->next = pmc_next;
1879                         else
1880                                 idev->mc_tomb = pmc_next;
1881                         in6_dev_put(pmc->idev);
1882                         kfree(pmc);
1883                 } else
1884                         pmc_prev = pmc;
1885         }
1886         spin_unlock(&idev->mc_lock);
1887
1888         /* change recs */
1889         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1890                 spin_lock_bh(&pmc->mca_lock);
1891                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1892                         type = MLD2_BLOCK_OLD_SOURCES;
1893                         dtype = MLD2_ALLOW_NEW_SOURCES;
1894                 } else {
1895                         type = MLD2_ALLOW_NEW_SOURCES;
1896                         dtype = MLD2_BLOCK_OLD_SOURCES;
1897                 }
1898                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1899                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1900
1901                 /* filter mode changes */
1902                 if (pmc->mca_crcount) {
1903                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1904                                 type = MLD2_CHANGE_TO_EXCLUDE;
1905                         else
1906                                 type = MLD2_CHANGE_TO_INCLUDE;
1907                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1908                         pmc->mca_crcount--;
1909                 }
1910                 spin_unlock_bh(&pmc->mca_lock);
1911         }
1912         read_unlock_bh(&idev->lock);
1913         if (!skb)
1914                 return;
1915         (void) mld_sendpack(skb);
1916 }
1917
1918 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1919 {
1920         struct net *net = dev_net(dev);
1921         struct sock *sk = net->ipv6.igmp_sk;
1922         struct inet6_dev *idev;
1923         struct sk_buff *skb;
1924         struct mld_msg *hdr;
1925         const struct in6_addr *snd_addr, *saddr;
1926         struct in6_addr addr_buf;
1927         int hlen = LL_RESERVED_SPACE(dev);
1928         int tlen = dev->needed_tailroom;
1929         int err, len, payload_len, full_len;
1930         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1931                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1932                      IPV6_TLV_PADN, 0 };
1933         struct flowi6 fl6;
1934         struct dst_entry *dst;
1935
1936         if (type == ICMPV6_MGM_REDUCTION)
1937                 snd_addr = &in6addr_linklocal_allrouters;
1938         else
1939                 snd_addr = addr;
1940
1941         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1942         payload_len = len + sizeof(ra);
1943         full_len = sizeof(struct ipv6hdr) + payload_len;
1944
1945         rcu_read_lock();
1946         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1947                       IPSTATS_MIB_OUT, full_len);
1948         rcu_read_unlock();
1949
1950         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1951
1952         if (skb == NULL) {
1953                 rcu_read_lock();
1954                 IP6_INC_STATS(net, __in6_dev_get(dev),
1955                               IPSTATS_MIB_OUTDISCARDS);
1956                 rcu_read_unlock();
1957                 return;
1958         }
1959         skb->priority = TC_PRIO_CONTROL;
1960         skb_reserve(skb, hlen);
1961
1962         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1963                 /* <draft-ietf-magma-mld-source-05.txt>:
1964                  * use unspecified address as the source address
1965                  * when a valid link-local address is not available.
1966                  */
1967                 saddr = &in6addr_any;
1968         } else
1969                 saddr = &addr_buf;
1970
1971         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1972
1973         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1974
1975         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1976         memset(hdr, 0, sizeof(struct mld_msg));
1977         hdr->mld_type = type;
1978         hdr->mld_mca = *addr;
1979
1980         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1981                                          IPPROTO_ICMPV6,
1982                                          csum_partial(hdr, len, 0));
1983
1984         rcu_read_lock();
1985         idev = __in6_dev_get(skb->dev);
1986
1987         icmpv6_flow_init(sk, &fl6, type,
1988                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1989                          skb->dev->ifindex);
1990         dst = icmp6_dst_alloc(skb->dev, &fl6);
1991         if (IS_ERR(dst)) {
1992                 err = PTR_ERR(dst);
1993                 goto err_out;
1994         }
1995
1996         skb_dst_set(skb, dst);
1997         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1998                       dst_output);
1999 out:
2000         if (!err) {
2001                 ICMP6MSGOUT_INC_STATS(net, idev, type);
2002                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2003                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
2004         } else
2005                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2006
2007         rcu_read_unlock();
2008         return;
2009
2010 err_out:
2011         kfree_skb(skb);
2012         goto out;
2013 }
2014
2015 static void mld_send_initial_cr(struct inet6_dev *idev)
2016 {
2017         struct sk_buff *skb;
2018         struct ifmcaddr6 *pmc;
2019         int type;
2020
2021         if (mld_in_v1_mode(idev))
2022                 return;
2023
2024         skb = NULL;
2025         read_lock_bh(&idev->lock);
2026         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2027                 spin_lock_bh(&pmc->mca_lock);
2028                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2029                         type = MLD2_CHANGE_TO_EXCLUDE;
2030                 else
2031                         type = MLD2_CHANGE_TO_INCLUDE;
2032                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2033                 spin_unlock_bh(&pmc->mca_lock);
2034         }
2035         read_unlock_bh(&idev->lock);
2036         if (skb)
2037                 mld_sendpack(skb);
2038 }
2039
2040 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2041 {
2042         idev->mc_dad_count = idev->mc_qrv;
2043         if (idev->mc_dad_count) {
2044                 mld_send_initial_cr(idev);
2045                 idev->mc_dad_count--;
2046                 if (idev->mc_dad_count)
2047                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2048         }
2049 }
2050
2051 static void mld_dad_timer_expire(unsigned long data)
2052 {
2053         struct inet6_dev *idev = (struct inet6_dev *)data;
2054
2055         mld_send_initial_cr(idev);
2056         if (idev->mc_dad_count) {
2057                 idev->mc_dad_count--;
2058                 if (idev->mc_dad_count)
2059                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2060         }
2061         in6_dev_put(idev);
2062 }
2063
2064 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2065         const struct in6_addr *psfsrc)
2066 {
2067         struct ip6_sf_list *psf, *psf_prev;
2068         int rv = 0;
2069
2070         psf_prev = NULL;
2071         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2072                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2073                         break;
2074                 psf_prev = psf;
2075         }
2076         if (!psf || psf->sf_count[sfmode] == 0) {
2077                 /* source filter not found, or count wrong =>  bug */
2078                 return -ESRCH;
2079         }
2080         psf->sf_count[sfmode]--;
2081         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2082                 struct inet6_dev *idev = pmc->idev;
2083
2084                 /* no more filters for this source */
2085                 if (psf_prev)
2086                         psf_prev->sf_next = psf->sf_next;
2087                 else
2088                         pmc->mca_sources = psf->sf_next;
2089                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2090                     !mld_in_v1_mode(idev)) {
2091                         psf->sf_crcount = idev->mc_qrv;
2092                         psf->sf_next = pmc->mca_tomb;
2093                         pmc->mca_tomb = psf;
2094                         rv = 1;
2095                 } else
2096                         kfree(psf);
2097         }
2098         return rv;
2099 }
2100
2101 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2102                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2103                           int delta)
2104 {
2105         struct ifmcaddr6 *pmc;
2106         int     changerec = 0;
2107         int     i, err;
2108
2109         if (!idev)
2110                 return -ENODEV;
2111         read_lock_bh(&idev->lock);
2112         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2113                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2114                         break;
2115         }
2116         if (!pmc) {
2117                 /* MCA not found?? bug */
2118                 read_unlock_bh(&idev->lock);
2119                 return -ESRCH;
2120         }
2121         spin_lock_bh(&pmc->mca_lock);
2122         sf_markstate(pmc);
2123         if (!delta) {
2124                 if (!pmc->mca_sfcount[sfmode]) {
2125                         spin_unlock_bh(&pmc->mca_lock);
2126                         read_unlock_bh(&idev->lock);
2127                         return -EINVAL;
2128                 }
2129                 pmc->mca_sfcount[sfmode]--;
2130         }
2131         err = 0;
2132         for (i=0; i<sfcount; i++) {
2133                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2134
2135                 changerec |= rv > 0;
2136                 if (!err && rv < 0)
2137                         err = rv;
2138         }
2139         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2140             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2141             pmc->mca_sfcount[MCAST_INCLUDE]) {
2142                 struct ip6_sf_list *psf;
2143
2144                 /* filter mode change */
2145                 pmc->mca_sfmode = MCAST_INCLUDE;
2146                 pmc->mca_crcount = idev->mc_qrv;
2147                 idev->mc_ifc_count = pmc->mca_crcount;
2148                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2149                         psf->sf_crcount = 0;
2150                 mld_ifc_event(pmc->idev);
2151         } else if (sf_setstate(pmc) || changerec)
2152                 mld_ifc_event(pmc->idev);
2153         spin_unlock_bh(&pmc->mca_lock);
2154         read_unlock_bh(&idev->lock);
2155         return err;
2156 }
2157
2158 /*
2159  * Add multicast single-source filter to the interface list
2160  */
2161 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2162         const struct in6_addr *psfsrc)
2163 {
2164         struct ip6_sf_list *psf, *psf_prev;
2165
2166         psf_prev = NULL;
2167         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2168                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2169                         break;
2170                 psf_prev = psf;
2171         }
2172         if (!psf) {
2173                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2174                 if (!psf)
2175                         return -ENOBUFS;
2176
2177                 psf->sf_addr = *psfsrc;
2178                 if (psf_prev) {
2179                         psf_prev->sf_next = psf;
2180                 } else
2181                         pmc->mca_sources = psf;
2182         }
2183         psf->sf_count[sfmode]++;
2184         return 0;
2185 }
2186
2187 static void sf_markstate(struct ifmcaddr6 *pmc)
2188 {
2189         struct ip6_sf_list *psf;
2190         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2191
2192         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2193                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2194                         psf->sf_oldin = mca_xcount ==
2195                                 psf->sf_count[MCAST_EXCLUDE] &&
2196                                 !psf->sf_count[MCAST_INCLUDE];
2197                 } else
2198                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2199 }
2200
2201 static int sf_setstate(struct ifmcaddr6 *pmc)
2202 {
2203         struct ip6_sf_list *psf, *dpsf;
2204         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2205         int qrv = pmc->idev->mc_qrv;
2206         int new_in, rv;
2207
2208         rv = 0;
2209         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2210                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2211                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2212                                 !psf->sf_count[MCAST_INCLUDE];
2213                 } else
2214                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2215                 if (new_in) {
2216                         if (!psf->sf_oldin) {
2217                                 struct ip6_sf_list *prev = NULL;
2218
2219                                 for (dpsf=pmc->mca_tomb; dpsf;
2220                                      dpsf=dpsf->sf_next) {
2221                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2222                                             &psf->sf_addr))
2223                                                 break;
2224                                         prev = dpsf;
2225                                 }
2226                                 if (dpsf) {
2227                                         if (prev)
2228                                                 prev->sf_next = dpsf->sf_next;
2229                                         else
2230                                                 pmc->mca_tomb = dpsf->sf_next;
2231                                         kfree(dpsf);
2232                                 }
2233                                 psf->sf_crcount = qrv;
2234                                 rv++;
2235                         }
2236                 } else if (psf->sf_oldin) {
2237                         psf->sf_crcount = 0;
2238                         /*
2239                          * add or update "delete" records if an active filter
2240                          * is now inactive
2241                          */
2242                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2243                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2244                                     &psf->sf_addr))
2245                                         break;
2246                         if (!dpsf) {
2247                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2248                                 if (!dpsf)
2249                                         continue;
2250                                 *dpsf = *psf;
2251                                 /* pmc->mca_lock held by callers */
2252                                 dpsf->sf_next = pmc->mca_tomb;
2253                                 pmc->mca_tomb = dpsf;
2254                         }
2255                         dpsf->sf_crcount = qrv;
2256                         rv++;
2257                 }
2258         }
2259         return rv;
2260 }
2261
2262 /*
2263  * Add multicast source filter list to the interface list
2264  */
2265 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2266                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2267                           int delta)
2268 {
2269         struct ifmcaddr6 *pmc;
2270         int     isexclude;
2271         int     i, err;
2272
2273         if (!idev)
2274                 return -ENODEV;
2275         read_lock_bh(&idev->lock);
2276         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2277                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2278                         break;
2279         }
2280         if (!pmc) {
2281                 /* MCA not found?? bug */
2282                 read_unlock_bh(&idev->lock);
2283                 return -ESRCH;
2284         }
2285         spin_lock_bh(&pmc->mca_lock);
2286
2287         sf_markstate(pmc);
2288         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2289         if (!delta)
2290                 pmc->mca_sfcount[sfmode]++;
2291         err = 0;
2292         for (i=0; i<sfcount; i++) {
2293                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2294                 if (err)
2295                         break;
2296         }
2297         if (err) {
2298                 int j;
2299
2300                 if (!delta)
2301                         pmc->mca_sfcount[sfmode]--;
2302                 for (j=0; j<i; j++)
2303                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2304         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2305                 struct ip6_sf_list *psf;
2306
2307                 /* filter mode change */
2308                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2309                         pmc->mca_sfmode = MCAST_EXCLUDE;
2310                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2311                         pmc->mca_sfmode = MCAST_INCLUDE;
2312                 /* else no filters; keep old mode for reports */
2313
2314                 pmc->mca_crcount = idev->mc_qrv;
2315                 idev->mc_ifc_count = pmc->mca_crcount;
2316                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2317                         psf->sf_crcount = 0;
2318                 mld_ifc_event(idev);
2319         } else if (sf_setstate(pmc))
2320                 mld_ifc_event(idev);
2321         spin_unlock_bh(&pmc->mca_lock);
2322         read_unlock_bh(&idev->lock);
2323         return err;
2324 }
2325
2326 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2327 {
2328         struct ip6_sf_list *psf, *nextpsf;
2329
2330         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2331                 nextpsf = psf->sf_next;
2332                 kfree(psf);
2333         }
2334         pmc->mca_tomb = NULL;
2335         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2336                 nextpsf = psf->sf_next;
2337                 kfree(psf);
2338         }
2339         pmc->mca_sources = NULL;
2340         pmc->mca_sfmode = MCAST_EXCLUDE;
2341         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2342         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2343 }
2344
2345
2346 static void igmp6_join_group(struct ifmcaddr6 *ma)
2347 {
2348         unsigned long delay;
2349
2350         if (ma->mca_flags & MAF_NOREPORT)
2351                 return;
2352
2353         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2354
2355         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2356
2357         spin_lock_bh(&ma->mca_lock);
2358         if (del_timer(&ma->mca_timer)) {
2359                 atomic_dec(&ma->mca_refcnt);
2360                 delay = ma->mca_timer.expires - jiffies;
2361         }
2362
2363         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2364                 atomic_inc(&ma->mca_refcnt);
2365         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2366         spin_unlock_bh(&ma->mca_lock);
2367 }
2368
2369 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2370                             struct inet6_dev *idev)
2371 {
2372         int err;
2373
2374         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2375          * so no other readers or writers of iml or its sflist
2376          */
2377         if (!iml->sflist) {
2378                 /* any-source empty exclude case */
2379                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2380         }
2381         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2382                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2383         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2384         iml->sflist = NULL;
2385         return err;
2386 }
2387
2388 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2389 {
2390         if (mld_in_v1_mode(ma->idev)) {
2391                 if (ma->mca_flags & MAF_LAST_REPORTER)
2392                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2393                                 ICMPV6_MGM_REDUCTION);
2394         } else {
2395                 mld_add_delrec(ma->idev, ma);
2396                 mld_ifc_event(ma->idev);
2397         }
2398 }
2399
2400 static void mld_gq_timer_expire(unsigned long data)
2401 {
2402         struct inet6_dev *idev = (struct inet6_dev *)data;
2403
2404         idev->mc_gq_running = 0;
2405         mld_send_report(idev, NULL);
2406         in6_dev_put(idev);
2407 }
2408
2409 static void mld_ifc_timer_expire(unsigned long data)
2410 {
2411         struct inet6_dev *idev = (struct inet6_dev *)data;
2412
2413         mld_send_cr(idev);
2414         if (idev->mc_ifc_count) {
2415                 idev->mc_ifc_count--;
2416                 if (idev->mc_ifc_count)
2417                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2418         }
2419         in6_dev_put(idev);
2420 }
2421
2422 static void mld_ifc_event(struct inet6_dev *idev)
2423 {
2424         if (mld_in_v1_mode(idev))
2425                 return;
2426         idev->mc_ifc_count = idev->mc_qrv;
2427         mld_ifc_start_timer(idev, 1);
2428 }
2429
2430
2431 static void igmp6_timer_handler(unsigned long data)
2432 {
2433         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2434
2435         if (mld_in_v1_mode(ma->idev))
2436                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2437         else
2438                 mld_send_report(ma->idev, ma);
2439
2440         spin_lock(&ma->mca_lock);
2441         ma->mca_flags |=  MAF_LAST_REPORTER;
2442         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2443         spin_unlock(&ma->mca_lock);
2444         ma_put(ma);
2445 }
2446
2447 /* Device changing type */
2448
2449 void ipv6_mc_unmap(struct inet6_dev *idev)
2450 {
2451         struct ifmcaddr6 *i;
2452
2453         /* Install multicast list, except for all-nodes (already installed) */
2454
2455         read_lock_bh(&idev->lock);
2456         for (i = idev->mc_list; i; i = i->next)
2457                 igmp6_group_dropped(i);
2458         read_unlock_bh(&idev->lock);
2459 }
2460
2461 void ipv6_mc_remap(struct inet6_dev *idev)
2462 {
2463         ipv6_mc_up(idev);
2464 }
2465
2466 /* Device going down */
2467
2468 void ipv6_mc_down(struct inet6_dev *idev)
2469 {
2470         struct ifmcaddr6 *i;
2471
2472         /* Withdraw multicast list */
2473
2474         read_lock_bh(&idev->lock);
2475         mld_ifc_stop_timer(idev);
2476         mld_gq_stop_timer(idev);
2477         mld_dad_stop_timer(idev);
2478
2479         for (i = idev->mc_list; i; i=i->next)
2480                 igmp6_group_dropped(i);
2481         read_unlock_bh(&idev->lock);
2482
2483         mld_clear_delrec(idev);
2484 }
2485
2486
2487 /* Device going up */
2488
2489 void ipv6_mc_up(struct inet6_dev *idev)
2490 {
2491         struct ifmcaddr6 *i;
2492
2493         /* Install multicast list, except for all-nodes (already installed) */
2494
2495         read_lock_bh(&idev->lock);
2496         for (i = idev->mc_list; i; i=i->next)
2497                 igmp6_group_added(i);
2498         read_unlock_bh(&idev->lock);
2499 }
2500
2501 /* IPv6 device initialization. */
2502
2503 void ipv6_mc_init_dev(struct inet6_dev *idev)
2504 {
2505         write_lock_bh(&idev->lock);
2506         spin_lock_init(&idev->mc_lock);
2507         idev->mc_gq_running = 0;
2508         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2509                         (unsigned long)idev);
2510         idev->mc_tomb = NULL;
2511         idev->mc_ifc_count = 0;
2512         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2513                         (unsigned long)idev);
2514         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2515                     (unsigned long)idev);
2516
2517         idev->mc_qrv = MLD_QRV_DEFAULT;
2518         idev->mc_qi = MLD_QI_DEFAULT;
2519         idev->mc_qri = MLD_QRI_DEFAULT;
2520
2521         idev->mc_maxdelay = unsolicited_report_interval(idev);
2522         idev->mc_v1_seen = 0;
2523         write_unlock_bh(&idev->lock);
2524 }
2525
2526 /*
2527  *      Device is about to be destroyed: clean up.
2528  */
2529
2530 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2531 {
2532         struct ifmcaddr6 *i;
2533
2534         /* Deactivate timers */
2535         ipv6_mc_down(idev);
2536
2537         /* Delete all-nodes address. */
2538         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2539          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2540          * fail.
2541          */
2542         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2543
2544         if (idev->cnf.forwarding)
2545                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2546
2547         write_lock_bh(&idev->lock);
2548         while ((i = idev->mc_list) != NULL) {
2549                 idev->mc_list = i->next;
2550                 write_unlock_bh(&idev->lock);
2551
2552                 igmp6_group_dropped(i);
2553                 ma_put(i);
2554
2555                 write_lock_bh(&idev->lock);
2556         }
2557         write_unlock_bh(&idev->lock);
2558 }
2559
2560 #ifdef CONFIG_PROC_FS
2561 struct igmp6_mc_iter_state {
2562         struct seq_net_private p;
2563         struct net_device *dev;
2564         struct inet6_dev *idev;
2565 };
2566
2567 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2568
2569 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2570 {
2571         struct ifmcaddr6 *im = NULL;
2572         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2573         struct net *net = seq_file_net(seq);
2574
2575         state->idev = NULL;
2576         for_each_netdev_rcu(net, state->dev) {
2577                 struct inet6_dev *idev;
2578                 idev = __in6_dev_get(state->dev);
2579                 if (!idev)
2580                         continue;
2581                 read_lock_bh(&idev->lock);
2582                 im = idev->mc_list;
2583                 if (im) {
2584                         state->idev = idev;
2585                         break;
2586                 }
2587                 read_unlock_bh(&idev->lock);
2588         }
2589         return im;
2590 }
2591
2592 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2593 {
2594         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2595
2596         im = im->next;
2597         while (!im) {
2598                 if (likely(state->idev != NULL))
2599                         read_unlock_bh(&state->idev->lock);
2600
2601                 state->dev = next_net_device_rcu(state->dev);
2602                 if (!state->dev) {
2603                         state->idev = NULL;
2604                         break;
2605                 }
2606                 state->idev = __in6_dev_get(state->dev);
2607                 if (!state->idev)
2608                         continue;
2609                 read_lock_bh(&state->idev->lock);
2610                 im = state->idev->mc_list;
2611         }
2612         return im;
2613 }
2614
2615 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2616 {
2617         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2618         if (im)
2619                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2620                         --pos;
2621         return pos ? NULL : im;
2622 }
2623
2624 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2625         __acquires(RCU)
2626 {
2627         rcu_read_lock();
2628         return igmp6_mc_get_idx(seq, *pos);
2629 }
2630
2631 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2632 {
2633         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2634
2635         ++*pos;
2636         return im;
2637 }
2638
2639 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2640         __releases(RCU)
2641 {
2642         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2643
2644         if (likely(state->idev != NULL)) {
2645                 read_unlock_bh(&state->idev->lock);
2646                 state->idev = NULL;
2647         }
2648         state->dev = NULL;
2649         rcu_read_unlock();
2650 }
2651
2652 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2653 {
2654         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2655         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2656
2657         seq_printf(seq,
2658                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2659                    state->dev->ifindex, state->dev->name,
2660                    &im->mca_addr,
2661                    im->mca_users, im->mca_flags,
2662                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2663                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2664         return 0;
2665 }
2666
2667 static const struct seq_operations igmp6_mc_seq_ops = {
2668         .start  =       igmp6_mc_seq_start,
2669         .next   =       igmp6_mc_seq_next,
2670         .stop   =       igmp6_mc_seq_stop,
2671         .show   =       igmp6_mc_seq_show,
2672 };
2673
2674 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2675 {
2676         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2677                             sizeof(struct igmp6_mc_iter_state));
2678 }
2679
2680 static const struct file_operations igmp6_mc_seq_fops = {
2681         .owner          =       THIS_MODULE,
2682         .open           =       igmp6_mc_seq_open,
2683         .read           =       seq_read,
2684         .llseek         =       seq_lseek,
2685         .release        =       seq_release_net,
2686 };
2687
2688 struct igmp6_mcf_iter_state {
2689         struct seq_net_private p;
2690         struct net_device *dev;
2691         struct inet6_dev *idev;
2692         struct ifmcaddr6 *im;
2693 };
2694
2695 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2696
2697 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2698 {
2699         struct ip6_sf_list *psf = NULL;
2700         struct ifmcaddr6 *im = NULL;
2701         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2702         struct net *net = seq_file_net(seq);
2703
2704         state->idev = NULL;
2705         state->im = NULL;
2706         for_each_netdev_rcu(net, state->dev) {
2707                 struct inet6_dev *idev;
2708                 idev = __in6_dev_get(state->dev);
2709                 if (unlikely(idev == NULL))
2710                         continue;
2711                 read_lock_bh(&idev->lock);
2712                 im = idev->mc_list;
2713                 if (likely(im != NULL)) {
2714                         spin_lock_bh(&im->mca_lock);
2715                         psf = im->mca_sources;
2716                         if (likely(psf != NULL)) {
2717                                 state->im = im;
2718                                 state->idev = idev;
2719                                 break;
2720                         }
2721                         spin_unlock_bh(&im->mca_lock);
2722                 }
2723                 read_unlock_bh(&idev->lock);
2724         }
2725         return psf;
2726 }
2727
2728 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2729 {
2730         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2731
2732         psf = psf->sf_next;
2733         while (!psf) {
2734                 spin_unlock_bh(&state->im->mca_lock);
2735                 state->im = state->im->next;
2736                 while (!state->im) {
2737                         if (likely(state->idev != NULL))
2738                                 read_unlock_bh(&state->idev->lock);
2739
2740                         state->dev = next_net_device_rcu(state->dev);
2741                         if (!state->dev) {
2742                                 state->idev = NULL;
2743                                 goto out;
2744                         }
2745                         state->idev = __in6_dev_get(state->dev);
2746                         if (!state->idev)
2747                                 continue;
2748                         read_lock_bh(&state->idev->lock);
2749                         state->im = state->idev->mc_list;
2750                 }
2751                 if (!state->im)
2752                         break;
2753                 spin_lock_bh(&state->im->mca_lock);
2754                 psf = state->im->mca_sources;
2755         }
2756 out:
2757         return psf;
2758 }
2759
2760 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2761 {
2762         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2763         if (psf)
2764                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2765                         --pos;
2766         return pos ? NULL : psf;
2767 }
2768
2769 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2770         __acquires(RCU)
2771 {
2772         rcu_read_lock();
2773         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2774 }
2775
2776 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2777 {
2778         struct ip6_sf_list *psf;
2779         if (v == SEQ_START_TOKEN)
2780                 psf = igmp6_mcf_get_first(seq);
2781         else
2782                 psf = igmp6_mcf_get_next(seq, v);
2783         ++*pos;
2784         return psf;
2785 }
2786
2787 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2788         __releases(RCU)
2789 {
2790         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2791         if (likely(state->im != NULL)) {
2792                 spin_unlock_bh(&state->im->mca_lock);
2793                 state->im = NULL;
2794         }
2795         if (likely(state->idev != NULL)) {
2796                 read_unlock_bh(&state->idev->lock);
2797                 state->idev = NULL;
2798         }
2799         state->dev = NULL;
2800         rcu_read_unlock();
2801 }
2802
2803 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2804 {
2805         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2806         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2807
2808         if (v == SEQ_START_TOKEN) {
2809                 seq_printf(seq,
2810                            "%3s %6s "
2811                            "%32s %32s %6s %6s\n", "Idx",
2812                            "Device", "Multicast Address",
2813                            "Source Address", "INC", "EXC");
2814         } else {
2815                 seq_printf(seq,
2816                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2817                            state->dev->ifindex, state->dev->name,
2818                            &state->im->mca_addr,
2819                            &psf->sf_addr,
2820                            psf->sf_count[MCAST_INCLUDE],
2821                            psf->sf_count[MCAST_EXCLUDE]);
2822         }
2823         return 0;
2824 }
2825
2826 static const struct seq_operations igmp6_mcf_seq_ops = {
2827         .start  =       igmp6_mcf_seq_start,
2828         .next   =       igmp6_mcf_seq_next,
2829         .stop   =       igmp6_mcf_seq_stop,
2830         .show   =       igmp6_mcf_seq_show,
2831 };
2832
2833 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2834 {
2835         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2836                             sizeof(struct igmp6_mcf_iter_state));
2837 }
2838
2839 static const struct file_operations igmp6_mcf_seq_fops = {
2840         .owner          =       THIS_MODULE,
2841         .open           =       igmp6_mcf_seq_open,
2842         .read           =       seq_read,
2843         .llseek         =       seq_lseek,
2844         .release        =       seq_release_net,
2845 };
2846
2847 static int __net_init igmp6_proc_init(struct net *net)
2848 {
2849         int err;
2850
2851         err = -ENOMEM;
2852         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2853                 goto out;
2854         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2855                          &igmp6_mcf_seq_fops))
2856                 goto out_proc_net_igmp6;
2857
2858         err = 0;
2859 out:
2860         return err;
2861
2862 out_proc_net_igmp6:
2863         remove_proc_entry("igmp6", net->proc_net);
2864         goto out;
2865 }
2866
2867 static void __net_exit igmp6_proc_exit(struct net *net)
2868 {
2869         remove_proc_entry("mcfilter6", net->proc_net);
2870         remove_proc_entry("igmp6", net->proc_net);
2871 }
2872 #else
2873 static inline int igmp6_proc_init(struct net *net)
2874 {
2875         return 0;
2876 }
2877 static inline void igmp6_proc_exit(struct net *net)
2878 {
2879 }
2880 #endif
2881
2882 static int __net_init igmp6_net_init(struct net *net)
2883 {
2884         int err;
2885
2886         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2887                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2888         if (err < 0) {
2889                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2890                        err);
2891                 goto out;
2892         }
2893
2894         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2895
2896         err = igmp6_proc_init(net);
2897         if (err)
2898                 goto out_sock_create;
2899 out:
2900         return err;
2901
2902 out_sock_create:
2903         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2904         goto out;
2905 }
2906
2907 static void __net_exit igmp6_net_exit(struct net *net)
2908 {
2909         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2910         igmp6_proc_exit(net);
2911 }
2912
2913 static struct pernet_operations igmp6_net_ops = {
2914         .init = igmp6_net_init,
2915         .exit = igmp6_net_exit,
2916 };
2917
2918 int __init igmp6_init(void)
2919 {
2920         return register_pernet_subsys(&igmp6_net_ops);
2921 }
2922
2923 void igmp6_cleanup(void)
2924 {
2925         unregister_pernet_subsys(&igmp6_net_ops);
2926 }