net/ipv6/mcast.c

   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/slab.h>
  47 #include <net/mld.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/net_namespace.h>
  53 #include <net/sock.h>
  54 #include <net/snmp.h>
  55
  56 #include <net/ipv6.h>
  57 #include <net/protocol.h>
  58 #include <net/if_inet6.h>
  59 #include <net/ndisc.h>
  60 #include <net/addrconf.h>
  61 #include <net/ip6_route.h>
  62 #include <net/inet_common.h>
  63
  64 #include <net/ip6_checksum.h>
  65
  66 /* Set to 3 to get tracing... */
  67 #define MCAST_DEBUG 2
  68
  69 #if MCAST_DEBUG >= 3
  70 #define MDBG(x) printk x
  71 #else
  72 #define MDBG(x)
  73 #endif
  74
  75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
  76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  77         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  78         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  79         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  80 };
  81
  82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84 /* Big mc list lock for all the sockets */
  85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  86
  87 static void igmp6_join_group(struct ifmcaddr6 *ma);
  88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89 static void igmp6_timer_handler(unsigned long data);
  90
  91 static void mld_gq_timer_expire(unsigned long data);
  92 static void mld_ifc_timer_expire(unsigned long data);
  93 static void mld_ifc_event(struct inet6_dev *idev);
  94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  96 static void mld_clear_delrec(struct inet6_dev *idev);
  97 static int sf_setstate(struct ifmcaddr6 *pmc);
  98 static void sf_markstate(struct ifmcaddr6 *pmc);
  99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 101                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 102                           int delta);
 103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 104                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 105                           int delta);
 106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 107                             struct inet6_dev *idev);
 108
 109
 110 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 111 #define MLD_QRV_DEFAULT         2
 112
 113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 114                 (idev)->cnf.force_mld_version == 1 || \
 115                 ((idev)->mc_v1_seen && \
 116                 time_before(jiffies, (idev)->mc_v1_seen)))
 117
 118 #define IPV6_MLD_MAX_MSF        64
 119
 120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 121
 122 /*
 123  *      socket join on multicast group
 124  */
 125
 126 #define for_each_pmc_rcu(np, pmc)                               \
 127         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
 128              pmc != NULL;                                       \
 129              pmc = rcu_dereference(pmc->next))
 130
 131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 132 {
 133         struct net_device *dev = NULL;
 134         struct ipv6_mc_socklist *mc_lst;
 135         struct ipv6_pinfo *np = inet6_sk(sk);
 136         struct net *net = sock_net(sk);
 137         int err;
 138
 139         if (!ipv6_addr_is_multicast(addr))
 140                 return -EINVAL;
 141
 142         rcu_read_lock();
 143         for_each_pmc_rcu(np, mc_lst) {
 144                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 145                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 146                         rcu_read_unlock();
 147                         return -EADDRINUSE;
 148                 }
 149         }
 150         rcu_read_unlock();
 151
 152         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 153
 154         if (mc_lst == NULL)
 155                 return -ENOMEM;
 156
 157         mc_lst->next = NULL;
 158         mc_lst->addr = *addr;
 159
 160         rcu_read_lock();
 161         if (ifindex == 0) {
 162                 struct rt6_info *rt;
 163                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 164                 if (rt) {
 165                         dev = rt->dst.dev;
 166                         ip6_rt_put(rt);
 167                 }
 168         } else
 169                 dev = dev_get_by_index_rcu(net, ifindex);
 170
 171         if (dev == NULL) {
 172                 rcu_read_unlock();
 173                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 174                 return -ENODEV;
 175         }
 176
 177         mc_lst->ifindex = dev->ifindex;
 178         mc_lst->sfmode = MCAST_EXCLUDE;
 179         rwlock_init(&mc_lst->sflock);
 180         mc_lst->sflist = NULL;
 181
 182         /*
 183          *      now add/increase the group membership on the device
 184          */
 185
 186         err = ipv6_dev_mc_inc(dev, addr);
 187
 188         if (err) {
 189                 rcu_read_unlock();
 190                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 191                 return err;
 192         }
 193
 194         spin_lock(&ipv6_sk_mc_lock);
 195         mc_lst->next = np->ipv6_mc_list;
 196         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 197         spin_unlock(&ipv6_sk_mc_lock);
 198
 199         rcu_read_unlock();
 200
 201         return 0;
 202 }
 203
 204 /*
 205  *      socket leave on multicast group
 206  */
 207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 208 {
 209         struct ipv6_pinfo *np = inet6_sk(sk);
 210         struct ipv6_mc_socklist *mc_lst;
 211         struct ipv6_mc_socklist __rcu **lnk;
 212         struct net *net = sock_net(sk);
 213
 214         if (!ipv6_addr_is_multicast(addr))
 215                 return -EINVAL;
 216
 217         spin_lock(&ipv6_sk_mc_lock);
 218         for (lnk = &np->ipv6_mc_list;
 219              (mc_lst = rcu_dereference_protected(*lnk,
 220                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 221               lnk = &mc_lst->next) {
 222                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 223                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 224                         struct net_device *dev;
 225
 226                         *lnk = mc_lst->next;
 227                         spin_unlock(&ipv6_sk_mc_lock);
 228
 229                         rcu_read_lock();
 230                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 231                         if (dev != NULL) {
 232                                 struct inet6_dev *idev = __in6_dev_get(dev);
 233
 234                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 235                                 if (idev)
 236                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 237                         } else
 238                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 239                         rcu_read_unlock();
 240                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 241                         kfree_rcu(mc_lst, rcu);
 242                         return 0;
 243                 }
 244         }
 245         spin_unlock(&ipv6_sk_mc_lock);
 246
 247         return -EADDRNOTAVAIL;
 248 }
 249
 250 /* called with rcu_read_lock() */
 251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 252                                              const struct in6_addr *group,
 253                                              int ifindex)
 254 {
 255         struct net_device *dev = NULL;
 256         struct inet6_dev *idev = NULL;
 257
 258         if (ifindex == 0) {
 259                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 260
 261                 if (rt) {
 262                         dev = rt->dst.dev;
 263                         ip6_rt_put(rt);
 264                 }
 265         } else
 266                 dev = dev_get_by_index_rcu(net, ifindex);
 267
 268         if (!dev)
 269                 return NULL;
 270         idev = __in6_dev_get(dev);
 271         if (!idev)
 272                 return NULL;
 273         read_lock_bh(&idev->lock);
 274         if (idev->dead) {
 275                 read_unlock_bh(&idev->lock);
 276                 return NULL;
 277         }
 278         return idev;
 279 }
 280
 281 void ipv6_sock_mc_close(struct sock *sk)
 282 {
 283         struct ipv6_pinfo *np = inet6_sk(sk);
 284         struct ipv6_mc_socklist *mc_lst;
 285         struct net *net = sock_net(sk);
 286
 287         if (!rcu_access_pointer(np->ipv6_mc_list))
 288                 return;
 289
 290         spin_lock(&ipv6_sk_mc_lock);
 291         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 292                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 293                 struct net_device *dev;
 294
 295                 np->ipv6_mc_list = mc_lst->next;
 296                 spin_unlock(&ipv6_sk_mc_lock);
 297
 298                 rcu_read_lock();
 299                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 300                 if (dev) {
 301                         struct inet6_dev *idev = __in6_dev_get(dev);
 302
 303                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 304                         if (idev)
 305                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 306                 } else
 307                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 308                 rcu_read_unlock();
 309
 310                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 311                 kfree_rcu(mc_lst, rcu);
 312
 313                 spin_lock(&ipv6_sk_mc_lock);
 314         }
 315         spin_unlock(&ipv6_sk_mc_lock);
 316 }
 317
 318 int ip6_mc_source(int add, int omode, struct sock *sk,
 319         struct group_source_req *pgsr)
 320 {
 321         struct in6_addr *source, *group;
 322         struct ipv6_mc_socklist *pmc;
 323         struct inet6_dev *idev;
 324         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 325         struct ip6_sf_socklist *psl;
 326         struct net *net = sock_net(sk);
 327         int i, j, rv;
 328         int leavegroup = 0;
 329         int pmclocked = 0;
 330         int err;
 331
 332         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 333         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 334
 335         if (!ipv6_addr_is_multicast(group))
 336                 return -EINVAL;
 337
 338         rcu_read_lock();
 339         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 340         if (!idev) {
 341                 rcu_read_unlock();
 342                 return -ENODEV;
 343         }
 344
 345         err = -EADDRNOTAVAIL;
 346
 347         for_each_pmc_rcu(inet6, pmc) {
 348                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 349                         continue;
 350                 if (ipv6_addr_equal(&pmc->addr, group))
 351                         break;
 352         }
 353         if (!pmc) {             /* must have a prior join */
 354                 err = -EINVAL;
 355                 goto done;
 356         }
 357         /* if a source filter was set, must be the same mode as before */
 358         if (pmc->sflist) {
 359                 if (pmc->sfmode != omode) {
 360                         err = -EINVAL;
 361                         goto done;
 362                 }
 363         } else if (pmc->sfmode != omode) {
 364                 /* allow mode switches for empty-set filters */
 365                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 366                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 367                 pmc->sfmode = omode;
 368         }
 369
 370         write_lock(&pmc->sflock);
 371         pmclocked = 1;
 372
 373         psl = pmc->sflist;
 374         if (!add) {
 375                 if (!psl)
 376                         goto done;      /* err = -EADDRNOTAVAIL */
 377                 rv = !0;
 378                 for (i=0; i<psl->sl_count; i++) {
 379                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 380                         if (rv == 0)
 381                                 break;
 382                 }
 383                 if (rv)         /* source not found */
 384                         goto done;      /* err = -EADDRNOTAVAIL */
 385
 386                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 387                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 388                         leavegroup = 1;
 389                         goto done;
 390                 }
 391
 392                 /* update the interface filter */
 393                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 394
 395                 for (j=i+1; j<psl->sl_count; j++)
 396                         psl->sl_addr[j-1] = psl->sl_addr[j];
 397                 psl->sl_count--;
 398                 err = 0;
 399                 goto done;
 400         }
 401         /* else, add a new source to the filter */
 402
 403         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 404                 err = -ENOBUFS;
 405                 goto done;
 406         }
 407         if (!psl || psl->sl_count == psl->sl_max) {
 408                 struct ip6_sf_socklist *newpsl;
 409                 int count = IP6_SFBLOCK;
 410
 411                 if (psl)
 412                         count += psl->sl_max;
 413                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 414                 if (!newpsl) {
 415                         err = -ENOBUFS;
 416                         goto done;
 417                 }
 418                 newpsl->sl_max = count;
 419                 newpsl->sl_count = count - IP6_SFBLOCK;
 420                 if (psl) {
 421                         for (i=0; i<psl->sl_count; i++)
 422                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 423                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 424                 }
 425                 pmc->sflist = psl = newpsl;
 426         }
 427         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 428         for (i=0; i<psl->sl_count; i++) {
 429                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 430                 if (rv == 0) /* There is an error in the address. */
 431                         goto done;
 432         }
 433         for (j=psl->sl_count-1; j>=i; j--)
 434                 psl->sl_addr[j+1] = psl->sl_addr[j];
 435         psl->sl_addr[i] = *source;
 436         psl->sl_count++;
 437         err = 0;
 438         /* update the interface list */
 439         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 440 done:
 441         if (pmclocked)
 442                 write_unlock(&pmc->sflock);
 443         read_unlock_bh(&idev->lock);
 444         rcu_read_unlock();
 445         if (leavegroup)
 446                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 447         return err;
 448 }
 449
 450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 451 {
 452         const struct in6_addr *group;
 453         struct ipv6_mc_socklist *pmc;
 454         struct inet6_dev *idev;
 455         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 456         struct ip6_sf_socklist *newpsl, *psl;
 457         struct net *net = sock_net(sk);
 458         int leavegroup = 0;
 459         int i, err;
 460
 461         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 462
 463         if (!ipv6_addr_is_multicast(group))
 464                 return -EINVAL;
 465         if (gsf->gf_fmode != MCAST_INCLUDE &&
 466             gsf->gf_fmode != MCAST_EXCLUDE)
 467                 return -EINVAL;
 468
 469         rcu_read_lock();
 470         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 471
 472         if (!idev) {
 473                 rcu_read_unlock();
 474                 return -ENODEV;
 475         }
 476
 477         err = 0;
 478
 479         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 480                 leavegroup = 1;
 481                 goto done;
 482         }
 483
 484         for_each_pmc_rcu(inet6, pmc) {
 485                 if (pmc->ifindex != gsf->gf_interface)
 486                         continue;
 487                 if (ipv6_addr_equal(&pmc->addr, group))
 488                         break;
 489         }
 490         if (!pmc) {             /* must have a prior join */
 491                 err = -EINVAL;
 492                 goto done;
 493         }
 494         if (gsf->gf_numsrc) {
 495                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 496                                                           GFP_ATOMIC);
 497                 if (!newpsl) {
 498                         err = -ENOBUFS;
 499                         goto done;
 500                 }
 501                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 502                 for (i=0; i<newpsl->sl_count; ++i) {
 503                         struct sockaddr_in6 *psin6;
 504
 505                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 506                         newpsl->sl_addr[i] = psin6->sin6_addr;
 507                 }
 508                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 509                         newpsl->sl_count, newpsl->sl_addr, 0);
 510                 if (err) {
 511                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 512                         goto done;
 513                 }
 514         } else {
 515                 newpsl = NULL;
 516                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 517         }
 518
 519         write_lock(&pmc->sflock);
 520         psl = pmc->sflist;
 521         if (psl) {
 522                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 523                         psl->sl_count, psl->sl_addr, 0);
 524                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 525         } else
 526                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 527         pmc->sflist = newpsl;
 528         pmc->sfmode = gsf->gf_fmode;
 529         write_unlock(&pmc->sflock);
 530         err = 0;
 531 done:
 532         read_unlock_bh(&idev->lock);
 533         rcu_read_unlock();
 534         if (leavegroup)
 535                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 536         return err;
 537 }
 538
 539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 540         struct group_filter __user *optval, int __user *optlen)
 541 {
 542         int err, i, count, copycount;
 543         const struct in6_addr *group;
 544         struct ipv6_mc_socklist *pmc;
 545         struct inet6_dev *idev;
 546         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 547         struct ip6_sf_socklist *psl;
 548         struct net *net = sock_net(sk);
 549
 550         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 551
 552         if (!ipv6_addr_is_multicast(group))
 553                 return -EINVAL;
 554
 555         rcu_read_lock();
 556         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 557
 558         if (!idev) {
 559                 rcu_read_unlock();
 560                 return -ENODEV;
 561         }
 562
 563         err = -EADDRNOTAVAIL;
 564         /*
 565          * changes to the ipv6_mc_list require the socket lock and
 566          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 567          * so reading the list is safe.
 568          */
 569
 570         for_each_pmc_rcu(inet6, pmc) {
 571                 if (pmc->ifindex != gsf->gf_interface)
 572                         continue;
 573                 if (ipv6_addr_equal(group, &pmc->addr))
 574                         break;
 575         }
 576         if (!pmc)               /* must have a prior join */
 577                 goto done;
 578         gsf->gf_fmode = pmc->sfmode;
 579         psl = pmc->sflist;
 580         count = psl ? psl->sl_count : 0;
 581         read_unlock_bh(&idev->lock);
 582         rcu_read_unlock();
 583
 584         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 585         gsf->gf_numsrc = count;
 586         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 587             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 588                 return -EFAULT;
 589         }
 590         /* changes to psl require the socket lock, a read lock on
 591          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 592          * have the socket lock, so reading here is safe.
 593          */
 594         for (i=0; i<copycount; i++) {
 595                 struct sockaddr_in6 *psin6;
 596                 struct sockaddr_storage ss;
 597
 598                 psin6 = (struct sockaddr_in6 *)&ss;
 599                 memset(&ss, 0, sizeof(ss));
 600                 psin6->sin6_family = AF_INET6;
 601                 psin6->sin6_addr = psl->sl_addr[i];
 602                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 603                         return -EFAULT;
 604         }
 605         return 0;
 606 done:
 607         read_unlock_bh(&idev->lock);
 608         rcu_read_unlock();
 609         return err;
 610 }
 611
 612 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 613                     const struct in6_addr *src_addr)
 614 {
 615         struct ipv6_pinfo *np = inet6_sk(sk);
 616         struct ipv6_mc_socklist *mc;
 617         struct ip6_sf_socklist *psl;
 618         bool rv = true;
 619
 620         rcu_read_lock();
 621         for_each_pmc_rcu(np, mc) {
 622                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 623                         break;
 624         }
 625         if (!mc) {
 626                 rcu_read_unlock();
 627                 return true;
 628         }
 629         read_lock(&mc->sflock);
 630         psl = mc->sflist;
 631         if (!psl) {
 632                 rv = mc->sfmode == MCAST_EXCLUDE;
 633         } else {
 634                 int i;
 635
 636                 for (i=0; i<psl->sl_count; i++) {
 637                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 638                                 break;
 639                 }
 640                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 641                         rv = false;
 642                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 643                         rv = false;
 644         }
 645         read_unlock(&mc->sflock);
 646         rcu_read_unlock();
 647
 648         return rv;
 649 }
 650
 651 static void ma_put(struct ifmcaddr6 *mc)
 652 {
 653         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 654                 in6_dev_put(mc->idev);
 655                 kfree(mc);
 656         }
 657 }
 658
 659 static void igmp6_group_added(struct ifmcaddr6 *mc)
 660 {
 661         struct net_device *dev = mc->idev->dev;
 662         char buf[MAX_ADDR_LEN];
 663
 664         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 665             IPV6_ADDR_SCOPE_LINKLOCAL)
 666                 return;
 667
 668         spin_lock_bh(&mc->mca_lock);
 669         if (!(mc->mca_flags&MAF_LOADED)) {
 670                 mc->mca_flags |= MAF_LOADED;
 671                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 672                         dev_mc_add(dev, buf);
 673         }
 674         spin_unlock_bh(&mc->mca_lock);
 675
 676         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 677                 return;
 678
 679         if (MLD_V1_SEEN(mc->idev)) {
 680                 igmp6_join_group(mc);
 681                 return;
 682         }
 683         /* else v2 */
 684
 685         mc->mca_crcount = mc->idev->mc_qrv;
 686         mld_ifc_event(mc->idev);
 687 }
 688
 689 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 690 {
 691         struct net_device *dev = mc->idev->dev;
 692         char buf[MAX_ADDR_LEN];
 693
 694         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 695             IPV6_ADDR_SCOPE_LINKLOCAL)
 696                 return;
 697
 698         spin_lock_bh(&mc->mca_lock);
 699         if (mc->mca_flags&MAF_LOADED) {
 700                 mc->mca_flags &= ~MAF_LOADED;
 701                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 702                         dev_mc_del(dev, buf);
 703         }
 704
 705         if (mc->mca_flags & MAF_NOREPORT)
 706                 goto done;
 707         spin_unlock_bh(&mc->mca_lock);
 708
 709         if (!mc->idev->dead)
 710                 igmp6_leave_group(mc);
 711
 712         spin_lock_bh(&mc->mca_lock);
 713         if (del_timer(&mc->mca_timer))
 714                 atomic_dec(&mc->mca_refcnt);
 715 done:
 716         ip6_mc_clear_src(mc);
 717         spin_unlock_bh(&mc->mca_lock);
 718 }
 719
 720 /*
 721  * deleted ifmcaddr6 manipulation
 722  */
 723 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 724 {
 725         struct ifmcaddr6 *pmc;
 726
 727         /* this is an "ifmcaddr6" for convenience; only the fields below
 728          * are actually used. In particular, the refcnt and users are not
 729          * used for management of the delete list. Using the same structure
 730          * for deleted items allows change reports to use common code with
 731          * non-deleted or query-response MCA's.
 732          */
 733         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 734         if (!pmc)
 735                 return;
 736
 737         spin_lock_bh(&im->mca_lock);
 738         spin_lock_init(&pmc->mca_lock);
 739         pmc->idev = im->idev;
 740         in6_dev_hold(idev);
 741         pmc->mca_addr = im->mca_addr;
 742         pmc->mca_crcount = idev->mc_qrv;
 743         pmc->mca_sfmode = im->mca_sfmode;
 744         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 745                 struct ip6_sf_list *psf;
 746
 747                 pmc->mca_tomb = im->mca_tomb;
 748                 pmc->mca_sources = im->mca_sources;
 749                 im->mca_tomb = im->mca_sources = NULL;
 750                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 751                         psf->sf_crcount = pmc->mca_crcount;
 752         }
 753         spin_unlock_bh(&im->mca_lock);
 754
 755         spin_lock_bh(&idev->mc_lock);
 756         pmc->next = idev->mc_tomb;
 757         idev->mc_tomb = pmc;
 758         spin_unlock_bh(&idev->mc_lock);
 759 }
 760
 761 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 762 {
 763         struct ifmcaddr6 *pmc, *pmc_prev;
 764         struct ip6_sf_list *psf, *psf_next;
 765
 766         spin_lock_bh(&idev->mc_lock);
 767         pmc_prev = NULL;
 768         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 769                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 770                         break;
 771                 pmc_prev = pmc;
 772         }
 773         if (pmc) {
 774                 if (pmc_prev)
 775                         pmc_prev->next = pmc->next;
 776                 else
 777                         idev->mc_tomb = pmc->next;
 778         }
 779         spin_unlock_bh(&idev->mc_lock);
 780
 781         if (pmc) {
 782                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 783                         psf_next = psf->sf_next;
 784                         kfree(psf);
 785                 }
 786                 in6_dev_put(pmc->idev);
 787                 kfree(pmc);
 788         }
 789 }
 790
 791 static void mld_clear_delrec(struct inet6_dev *idev)
 792 {
 793         struct ifmcaddr6 *pmc, *nextpmc;
 794
 795         spin_lock_bh(&idev->mc_lock);
 796         pmc = idev->mc_tomb;
 797         idev->mc_tomb = NULL;
 798         spin_unlock_bh(&idev->mc_lock);
 799
 800         for (; pmc; pmc = nextpmc) {
 801                 nextpmc = pmc->next;
 802                 ip6_mc_clear_src(pmc);
 803                 in6_dev_put(pmc->idev);
 804                 kfree(pmc);
 805         }
 806
 807         /* clear dead sources, too */
 808         read_lock_bh(&idev->lock);
 809         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 810                 struct ip6_sf_list *psf, *psf_next;
 811
 812                 spin_lock_bh(&pmc->mca_lock);
 813                 psf = pmc->mca_tomb;
 814                 pmc->mca_tomb = NULL;
 815                 spin_unlock_bh(&pmc->mca_lock);
 816                 for (; psf; psf=psf_next) {
 817                         psf_next = psf->sf_next;
 818                         kfree(psf);
 819                 }
 820         }
 821         read_unlock_bh(&idev->lock);
 822 }
 823
 824
 825 /*
 826  *      device multicast group inc (add if not found)
 827  */
 828 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 829 {
 830         struct ifmcaddr6 *mc;
 831         struct inet6_dev *idev;
 832
 833         /* we need to take a reference on idev */
 834         idev = in6_dev_get(dev);
 835
 836         if (idev == NULL)
 837                 return -EINVAL;
 838
 839         write_lock_bh(&idev->lock);
 840         if (idev->dead) {
 841                 write_unlock_bh(&idev->lock);
 842                 in6_dev_put(idev);
 843                 return -ENODEV;
 844         }
 845
 846         for (mc = idev->mc_list; mc; mc = mc->next) {
 847                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 848                         mc->mca_users++;
 849                         write_unlock_bh(&idev->lock);
 850                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 851                                 NULL, 0);
 852                         in6_dev_put(idev);
 853                         return 0;
 854                 }
 855         }
 856
 857         /*
 858          *      not found: create a new one.
 859          */
 860
 861         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 862
 863         if (mc == NULL) {
 864                 write_unlock_bh(&idev->lock);
 865                 in6_dev_put(idev);
 866                 return -ENOMEM;
 867         }
 868
 869         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 870
 871         mc->mca_addr = *addr;
 872         mc->idev = idev; /* (reference taken) */
 873         mc->mca_users = 1;
 874         /* mca_stamp should be updated upon changes */
 875         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 876         atomic_set(&mc->mca_refcnt, 2);
 877         spin_lock_init(&mc->mca_lock);
 878
 879         /* initial mode is (EX, empty) */
 880         mc->mca_sfmode = MCAST_EXCLUDE;
 881         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 882
 883         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 884             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 885                 mc->mca_flags |= MAF_NOREPORT;
 886
 887         mc->next = idev->mc_list;
 888         idev->mc_list = mc;
 889         write_unlock_bh(&idev->lock);
 890
 891         mld_del_delrec(idev, &mc->mca_addr);
 892         igmp6_group_added(mc);
 893         ma_put(mc);
 894         return 0;
 895 }
 896
 897 /*
 898  *      device multicast group del
 899  */
 900 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 901 {
 902         struct ifmcaddr6 *ma, **map;
 903
 904         write_lock_bh(&idev->lock);
 905         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 906                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 907                         if (--ma->mca_users == 0) {
 908                                 *map = ma->next;
 909                                 write_unlock_bh(&idev->lock);
 910
 911                                 igmp6_group_dropped(ma);
 912
 913                                 ma_put(ma);
 914                                 return 0;
 915                         }
 916                         write_unlock_bh(&idev->lock);
 917                         return 0;
 918                 }
 919         }
 920         write_unlock_bh(&idev->lock);
 921
 922         return -ENOENT;
 923 }
 924
 925 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 926 {
 927         struct inet6_dev *idev;
 928         int err;
 929
 930         rcu_read_lock();
 931
 932         idev = __in6_dev_get(dev);
 933         if (!idev)
 934                 err = -ENODEV;
 935         else
 936                 err = __ipv6_dev_mc_dec(idev, addr);
 937
 938         rcu_read_unlock();
 939         return err;
 940 }
 941
 942 /*
 943  *      check if the interface/address pair is valid
 944  */
 945 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 946                          const struct in6_addr *src_addr)
 947 {
 948         struct inet6_dev *idev;
 949         struct ifmcaddr6 *mc;
 950         bool rv = false;
 951
 952         rcu_read_lock();
 953         idev = __in6_dev_get(dev);
 954         if (idev) {
 955                 read_lock_bh(&idev->lock);
 956                 for (mc = idev->mc_list; mc; mc=mc->next) {
 957                         if (ipv6_addr_equal(&mc->mca_addr, group))
 958                                 break;
 959                 }
 960                 if (mc) {
 961                         if (src_addr && !ipv6_addr_any(src_addr)) {
 962                                 struct ip6_sf_list *psf;
 963
 964                                 spin_lock_bh(&mc->mca_lock);
 965                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 966                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 967                                                 break;
 968                                 }
 969                                 if (psf)
 970                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 971                                                 psf->sf_count[MCAST_EXCLUDE] !=
 972                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 973                                 else
 974                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 975                                 spin_unlock_bh(&mc->mca_lock);
 976                         } else
 977                                 rv = true; /* don't filter unspecified source */
 978                 }
 979                 read_unlock_bh(&idev->lock);
 980         }
 981         rcu_read_unlock();
 982         return rv;
 983 }
 984
 985 static void mld_gq_start_timer(struct inet6_dev *idev)
 986 {
 987         int tv = net_random() % idev->mc_maxdelay;
 988
 989         idev->mc_gq_running = 1;
 990         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
 991                 in6_dev_hold(idev);
 992 }
 993
 994 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
 995 {
 996         int tv = net_random() % delay;
 997
 998         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
 999                 in6_dev_hold(idev);
1000 }
1001
1002 /*
1003  *      IGMP handling (alias multicast ICMPv6 messages)
1004  */
1005
1006 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1007 {
1008         unsigned long delay = resptime;
1009
1010         /* Do not start timer for these addresses */
1011         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1012             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1013                 return;
1014
1015         if (del_timer(&ma->mca_timer)) {
1016                 atomic_dec(&ma->mca_refcnt);
1017                 delay = ma->mca_timer.expires - jiffies;
1018         }
1019
1020         if (delay >= resptime) {
1021                 if (resptime)
1022                         delay = net_random() % resptime;
1023                 else
1024                         delay = 1;
1025         }
1026         ma->mca_timer.expires = jiffies + delay;
1027         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1028                 atomic_inc(&ma->mca_refcnt);
1029         ma->mca_flags |= MAF_TIMER_RUNNING;
1030 }
1031
1032 /* mark EXCLUDE-mode sources */
1033 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1034                              const struct in6_addr *srcs)
1035 {
1036         struct ip6_sf_list *psf;
1037         int i, scount;
1038
1039         scount = 0;
1040         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1041                 if (scount == nsrcs)
1042                         break;
1043                 for (i=0; i<nsrcs; i++) {
1044                         /* skip inactive filters */
1045                         if (psf->sf_count[MCAST_INCLUDE] ||
1046                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1047                             psf->sf_count[MCAST_EXCLUDE])
1048                                 break;
1049                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1050                                 scount++;
1051                                 break;
1052                         }
1053                 }
1054         }
1055         pmc->mca_flags &= ~MAF_GSQUERY;
1056         if (scount == nsrcs)    /* all sources excluded */
1057                 return false;
1058         return true;
1059 }
1060
1061 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1062                             const struct in6_addr *srcs)
1063 {
1064         struct ip6_sf_list *psf;
1065         int i, scount;
1066
1067         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1068                 return mld_xmarksources(pmc, nsrcs, srcs);
1069
1070         /* mark INCLUDE-mode sources */
1071
1072         scount = 0;
1073         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1074                 if (scount == nsrcs)
1075                         break;
1076                 for (i=0; i<nsrcs; i++) {
1077                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1078                                 psf->sf_gsresp = 1;
1079                                 scount++;
1080                                 break;
1081                         }
1082                 }
1083         }
1084         if (!scount) {
1085                 pmc->mca_flags &= ~MAF_GSQUERY;
1086                 return false;
1087         }
1088         pmc->mca_flags |= MAF_GSQUERY;
1089         return true;
1090 }
1091
1092 /* called with rcu_read_lock() */
1093 int igmp6_event_query(struct sk_buff *skb)
1094 {
1095         struct mld2_query *mlh2 = NULL;
1096         struct ifmcaddr6 *ma;
1097         const struct in6_addr *group;
1098         unsigned long max_delay;
1099         struct inet6_dev *idev;
1100         struct mld_msg *mld;
1101         int group_type;
1102         int mark = 0;
1103         int len;
1104
1105         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1106                 return -EINVAL;
1107
1108         /* compute payload length excluding extension headers */
1109         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1110         len -= skb_network_header_len(skb);
1111
1112         /* Drop queries with not link local source */
1113         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1114                 return -EINVAL;
1115
1116         idev = __in6_dev_get(skb->dev);
1117
1118         if (idev == NULL)
1119                 return 0;
1120
1121         mld = (struct mld_msg *)icmp6_hdr(skb);
1122         group = &mld->mld_mca;
1123         group_type = ipv6_addr_type(group);
1124
1125         if (group_type != IPV6_ADDR_ANY &&
1126             !(group_type&IPV6_ADDR_MULTICAST))
1127                 return -EINVAL;
1128
1129         if (len == 24) {
1130                 int switchback;
1131                 /* MLDv1 router present */
1132
1133                 /* Translate milliseconds to jiffies */
1134                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1135
1136                 switchback = (idev->mc_qrv + 1) * max_delay;
1137                 idev->mc_v1_seen = jiffies + switchback;
1138
1139                 /* cancel the interface change timer */
1140                 idev->mc_ifc_count = 0;
1141                 if (del_timer(&idev->mc_ifc_timer))
1142                         __in6_dev_put(idev);
1143                 /* clear deleted report items */
1144                 mld_clear_delrec(idev);
1145         } else if (len >= 28) {
1146                 int srcs_offset = sizeof(struct mld2_query) -
1147                                   sizeof(struct icmp6hdr);
1148                 if (!pskb_may_pull(skb, srcs_offset))
1149                         return -EINVAL;
1150
1151                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1152                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1153                 if (!max_delay)
1154                         max_delay = 1;
1155                 idev->mc_maxdelay = max_delay;
1156                 if (mlh2->mld2q_qrv)
1157                         idev->mc_qrv = mlh2->mld2q_qrv;
1158                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1159                         if (mlh2->mld2q_nsrcs)
1160                                 return -EINVAL; /* no sources allowed */
1161
1162                         mld_gq_start_timer(idev);
1163                         return 0;
1164                 }
1165                 /* mark sources to include, if group & source-specific */
1166                 if (mlh2->mld2q_nsrcs != 0) {
1167                         if (!pskb_may_pull(skb, srcs_offset +
1168                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1169                                 return -EINVAL;
1170
1171                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1172                         mark = 1;
1173                 }
1174         } else
1175                 return -EINVAL;
1176
1177         read_lock_bh(&idev->lock);
1178         if (group_type == IPV6_ADDR_ANY) {
1179                 for (ma = idev->mc_list; ma; ma=ma->next) {
1180                         spin_lock_bh(&ma->mca_lock);
1181                         igmp6_group_queried(ma, max_delay);
1182                         spin_unlock_bh(&ma->mca_lock);
1183                 }
1184         } else {
1185                 for (ma = idev->mc_list; ma; ma=ma->next) {
1186                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1187                                 continue;
1188                         spin_lock_bh(&ma->mca_lock);
1189                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1190                                 /* gsquery <- gsquery && mark */
1191                                 if (!mark)
1192                                         ma->mca_flags &= ~MAF_GSQUERY;
1193                         } else {
1194                                 /* gsquery <- mark */
1195                                 if (mark)
1196                                         ma->mca_flags |= MAF_GSQUERY;
1197                                 else
1198                                         ma->mca_flags &= ~MAF_GSQUERY;
1199                         }
1200                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1201                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1202                                 igmp6_group_queried(ma, max_delay);
1203                         spin_unlock_bh(&ma->mca_lock);
1204                         break;
1205                 }
1206         }
1207         read_unlock_bh(&idev->lock);
1208
1209         return 0;
1210 }
1211
1212 /* called with rcu_read_lock() */
1213 int igmp6_event_report(struct sk_buff *skb)
1214 {
1215         struct ifmcaddr6 *ma;
1216         struct inet6_dev *idev;
1217         struct mld_msg *mld;
1218         int addr_type;
1219
1220         /* Our own report looped back. Ignore it. */
1221         if (skb->pkt_type == PACKET_LOOPBACK)
1222                 return 0;
1223
1224         /* send our report if the MC router may not have heard this report */
1225         if (skb->pkt_type != PACKET_MULTICAST &&
1226             skb->pkt_type != PACKET_BROADCAST)
1227                 return 0;
1228
1229         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1230                 return -EINVAL;
1231
1232         mld = (struct mld_msg *)icmp6_hdr(skb);
1233
1234         /* Drop reports with not link local source */
1235         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1236         if (addr_type != IPV6_ADDR_ANY &&
1237             !(addr_type&IPV6_ADDR_LINKLOCAL))
1238                 return -EINVAL;
1239
1240         idev = __in6_dev_get(skb->dev);
1241         if (idev == NULL)
1242                 return -ENODEV;
1243
1244         /*
1245          *      Cancel the timer for this group
1246          */
1247
1248         read_lock_bh(&idev->lock);
1249         for (ma = idev->mc_list; ma; ma=ma->next) {
1250                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1251                         spin_lock(&ma->mca_lock);
1252                         if (del_timer(&ma->mca_timer))
1253                                 atomic_dec(&ma->mca_refcnt);
1254                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1255                         spin_unlock(&ma->mca_lock);
1256                         break;
1257                 }
1258         }
1259         read_unlock_bh(&idev->lock);
1260         return 0;
1261 }
1262
1263 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1264                   int gdeleted, int sdeleted)
1265 {
1266         switch (type) {
1267         case MLD2_MODE_IS_INCLUDE:
1268         case MLD2_MODE_IS_EXCLUDE:
1269                 if (gdeleted || sdeleted)
1270                         return false;
1271                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1272                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1273                                 return true;
1274                         /* don't include if this source is excluded
1275                          * in all filters
1276                          */
1277                         if (psf->sf_count[MCAST_INCLUDE])
1278                                 return type == MLD2_MODE_IS_INCLUDE;
1279                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1280                                 psf->sf_count[MCAST_EXCLUDE];
1281                 }
1282                 return false;
1283         case MLD2_CHANGE_TO_INCLUDE:
1284                 if (gdeleted || sdeleted)
1285                         return false;
1286                 return psf->sf_count[MCAST_INCLUDE] != 0;
1287         case MLD2_CHANGE_TO_EXCLUDE:
1288                 if (gdeleted || sdeleted)
1289                         return false;
1290                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1291                     psf->sf_count[MCAST_INCLUDE])
1292                         return false;
1293                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1294                         psf->sf_count[MCAST_EXCLUDE];
1295         case MLD2_ALLOW_NEW_SOURCES:
1296                 if (gdeleted || !psf->sf_crcount)
1297                         return false;
1298                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1299         case MLD2_BLOCK_OLD_SOURCES:
1300                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1301                         return gdeleted || (psf->sf_crcount && sdeleted);
1302                 return psf->sf_crcount && !gdeleted && !sdeleted;
1303         }
1304         return false;
1305 }
1306
1307 static int
1308 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1309 {
1310         struct ip6_sf_list *psf;
1311         int scount = 0;
1312
1313         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1314                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1315                         continue;
1316                 scount++;
1317         }
1318         return scount;
1319 }
1320
1321 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1322                        struct net_device *dev,
1323                        const struct in6_addr *saddr,
1324                        const struct in6_addr *daddr,
1325                        int proto, int len)
1326 {
1327         struct ipv6hdr *hdr;
1328
1329         skb->protocol = htons(ETH_P_IPV6);
1330         skb->dev = dev;
1331
1332         skb_reset_network_header(skb);
1333         skb_put(skb, sizeof(struct ipv6hdr));
1334         hdr = ipv6_hdr(skb);
1335
1336         ip6_flow_hdr(hdr, 0, 0);
1337
1338         hdr->payload_len = htons(len);
1339         hdr->nexthdr = proto;
1340         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1341
1342         hdr->saddr = *saddr;
1343         hdr->daddr = *daddr;
1344 }
1345
1346 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1347 {
1348         struct net_device *dev = idev->dev;
1349         struct net *net = dev_net(dev);
1350         struct sock *sk = net->ipv6.igmp_sk;
1351         struct sk_buff *skb;
1352         struct mld2_report *pmr;
1353         struct in6_addr addr_buf;
1354         const struct in6_addr *saddr;
1355         int hlen = LL_RESERVED_SPACE(dev);
1356         int tlen = dev->needed_tailroom;
1357         int err;
1358         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1359                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1360                      IPV6_TLV_PADN, 0 };
1361
1362         /* we assume size > sizeof(ra) here */
1363         size += hlen + tlen;
1364         /* limit our allocations to order-0 page */
1365         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1366         skb = sock_alloc_send_skb(sk, size, 1, &err);
1367
1368         if (!skb)
1369                 return NULL;
1370
1371         skb_reserve(skb, hlen);
1372
1373         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1374                 /* <draft-ietf-magma-mld-source-05.txt>:
1375                  * use unspecified address as the source address
1376                  * when a valid link-local address is not available.
1377                  */
1378                 saddr = &in6addr_any;
1379         } else
1380                 saddr = &addr_buf;
1381
1382         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1383
1384         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1385
1386         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1387         skb_put(skb, sizeof(*pmr));
1388         pmr = (struct mld2_report *)skb_transport_header(skb);
1389         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1390         pmr->mld2r_resv1 = 0;
1391         pmr->mld2r_cksum = 0;
1392         pmr->mld2r_resv2 = 0;
1393         pmr->mld2r_ngrec = 0;
1394         return skb;
1395 }
1396
1397 static void mld_sendpack(struct sk_buff *skb)
1398 {
1399         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1400         struct mld2_report *pmr =
1401                               (struct mld2_report *)skb_transport_header(skb);
1402         int payload_len, mldlen;
1403         struct inet6_dev *idev;
1404         struct net *net = dev_net(skb->dev);
1405         int err;
1406         struct flowi6 fl6;
1407         struct dst_entry *dst;
1408
1409         rcu_read_lock();
1410         idev = __in6_dev_get(skb->dev);
1411         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1412
1413         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1414         mldlen = skb->tail - skb->transport_header;
1415         pip6->payload_len = htons(payload_len);
1416
1417         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1418                                            IPPROTO_ICMPV6,
1419                                            csum_partial(skb_transport_header(skb),
1420                                                         mldlen, 0));
1421
1422         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1423                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1424                          skb->dev->ifindex);
1425         dst = icmp6_dst_alloc(skb->dev, &fl6);
1426
1427         err = 0;
1428         if (IS_ERR(dst)) {
1429                 err = PTR_ERR(dst);
1430                 dst = NULL;
1431         }
1432         skb_dst_set(skb, dst);
1433         if (err)
1434                 goto err_out;
1435
1436         payload_len = skb->len;
1437
1438         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1439                       dst_output);
1440 out:
1441         if (!err) {
1442                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1443                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1444                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1445         } else {
1446                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1447         }
1448
1449         rcu_read_unlock();
1450         return;
1451
1452 err_out:
1453         kfree_skb(skb);
1454         goto out;
1455 }
1456
1457 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1458 {
1459         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1460 }
1461
1462 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1463         int type, struct mld2_grec **ppgr)
1464 {
1465         struct net_device *dev = pmc->idev->dev;
1466         struct mld2_report *pmr;
1467         struct mld2_grec *pgr;
1468
1469         if (!skb)
1470                 skb = mld_newpack(pmc->idev, dev->mtu);
1471         if (!skb)
1472                 return NULL;
1473         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1474         pgr->grec_type = type;
1475         pgr->grec_auxwords = 0;
1476         pgr->grec_nsrcs = 0;
1477         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1478         pmr = (struct mld2_report *)skb_transport_header(skb);
1479         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1480         *ppgr = pgr;
1481         return skb;
1482 }
1483
1484 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1485         skb_tailroom(skb)) : 0)
1486
1487 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1488         int type, int gdeleted, int sdeleted)
1489 {
1490         struct inet6_dev *idev = pmc->idev;
1491         struct net_device *dev = idev->dev;
1492         struct mld2_report *pmr;
1493         struct mld2_grec *pgr = NULL;
1494         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1495         int scount, stotal, first, isquery, truncate;
1496
1497         if (pmc->mca_flags & MAF_NOREPORT)
1498                 return skb;
1499
1500         isquery = type == MLD2_MODE_IS_INCLUDE ||
1501                   type == MLD2_MODE_IS_EXCLUDE;
1502         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1503                     type == MLD2_CHANGE_TO_EXCLUDE;
1504
1505         stotal = scount = 0;
1506
1507         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1508
1509         if (!*psf_list)
1510                 goto empty_source;
1511
1512         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1513
1514         /* EX and TO_EX get a fresh packet, if needed */
1515         if (truncate) {
1516                 if (pmr && pmr->mld2r_ngrec &&
1517                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1518                         if (skb)
1519                                 mld_sendpack(skb);
1520                         skb = mld_newpack(idev, dev->mtu);
1521                 }
1522         }
1523         first = 1;
1524         psf_prev = NULL;
1525         for (psf=*psf_list; psf; psf=psf_next) {
1526                 struct in6_addr *psrc;
1527
1528                 psf_next = psf->sf_next;
1529
1530                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1531                         psf_prev = psf;
1532                         continue;
1533                 }
1534
1535                 /* clear marks on query responses */
1536                 if (isquery)
1537                         psf->sf_gsresp = 0;
1538
1539                 if (AVAILABLE(skb) < sizeof(*psrc) +
1540                     first*sizeof(struct mld2_grec)) {
1541                         if (truncate && !first)
1542                                 break;   /* truncate these */
1543                         if (pgr)
1544                                 pgr->grec_nsrcs = htons(scount);
1545                         if (skb)
1546                                 mld_sendpack(skb);
1547                         skb = mld_newpack(idev, dev->mtu);
1548                         first = 1;
1549                         scount = 0;
1550                 }
1551                 if (first) {
1552                         skb = add_grhead(skb, pmc, type, &pgr);
1553                         first = 0;
1554                 }
1555                 if (!skb)
1556                         return NULL;
1557                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1558                 *psrc = psf->sf_addr;
1559                 scount++; stotal++;
1560                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1561                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1562                         psf->sf_crcount--;
1563                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1564                                 if (psf_prev)
1565                                         psf_prev->sf_next = psf->sf_next;
1566                                 else
1567                                         *psf_list = psf->sf_next;
1568                                 kfree(psf);
1569                                 continue;
1570                         }
1571                 }
1572                 psf_prev = psf;
1573         }
1574
1575 empty_source:
1576         if (!stotal) {
1577                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1578                     type == MLD2_BLOCK_OLD_SOURCES)
1579                         return skb;
1580                 if (pmc->mca_crcount || isquery) {
1581                         /* make sure we have room for group header */
1582                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1583                                 mld_sendpack(skb);
1584                                 skb = NULL; /* add_grhead will get a new one */
1585                         }
1586                         skb = add_grhead(skb, pmc, type, &pgr);
1587                 }
1588         }
1589         if (pgr)
1590                 pgr->grec_nsrcs = htons(scount);
1591
1592         if (isquery)
1593                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1594         return skb;
1595 }
1596
1597 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1598 {
1599         struct sk_buff *skb = NULL;
1600         int type;
1601
1602         read_lock_bh(&idev->lock);
1603         if (!pmc) {
1604                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1605                         if (pmc->mca_flags & MAF_NOREPORT)
1606                                 continue;
1607                         spin_lock_bh(&pmc->mca_lock);
1608                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1609                                 type = MLD2_MODE_IS_EXCLUDE;
1610                         else
1611                                 type = MLD2_MODE_IS_INCLUDE;
1612                         skb = add_grec(skb, pmc, type, 0, 0);
1613                         spin_unlock_bh(&pmc->mca_lock);
1614                 }
1615         } else {
1616                 spin_lock_bh(&pmc->mca_lock);
1617                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1618                         type = MLD2_MODE_IS_EXCLUDE;
1619                 else
1620                         type = MLD2_MODE_IS_INCLUDE;
1621                 skb = add_grec(skb, pmc, type, 0, 0);
1622                 spin_unlock_bh(&pmc->mca_lock);
1623         }
1624         read_unlock_bh(&idev->lock);
1625         if (skb)
1626                 mld_sendpack(skb);
1627 }
1628
1629 /*
1630  * remove zero-count source records from a source filter list
1631  */
1632 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1633 {
1634         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1635
1636         psf_prev = NULL;
1637         for (psf=*ppsf; psf; psf = psf_next) {
1638                 psf_next = psf->sf_next;
1639                 if (psf->sf_crcount == 0) {
1640                         if (psf_prev)
1641                                 psf_prev->sf_next = psf->sf_next;
1642                         else
1643                                 *ppsf = psf->sf_next;
1644                         kfree(psf);
1645                 } else
1646                         psf_prev = psf;
1647         }
1648 }
1649
1650 static void mld_send_cr(struct inet6_dev *idev)
1651 {
1652         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1653         struct sk_buff *skb = NULL;
1654         int type, dtype;
1655
1656         read_lock_bh(&idev->lock);
1657         spin_lock(&idev->mc_lock);
1658
1659         /* deleted MCA's */
1660         pmc_prev = NULL;
1661         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1662                 pmc_next = pmc->next;
1663                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1664                         type = MLD2_BLOCK_OLD_SOURCES;
1665                         dtype = MLD2_BLOCK_OLD_SOURCES;
1666                         skb = add_grec(skb, pmc, type, 1, 0);
1667                         skb = add_grec(skb, pmc, dtype, 1, 1);
1668                 }
1669                 if (pmc->mca_crcount) {
1670                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1671                                 type = MLD2_CHANGE_TO_INCLUDE;
1672                                 skb = add_grec(skb, pmc, type, 1, 0);
1673                         }
1674                         pmc->mca_crcount--;
1675                         if (pmc->mca_crcount == 0) {
1676                                 mld_clear_zeros(&pmc->mca_tomb);
1677                                 mld_clear_zeros(&pmc->mca_sources);
1678                         }
1679                 }
1680                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1681                     !pmc->mca_sources) {
1682                         if (pmc_prev)
1683                                 pmc_prev->next = pmc_next;
1684                         else
1685                                 idev->mc_tomb = pmc_next;
1686                         in6_dev_put(pmc->idev);
1687                         kfree(pmc);
1688                 } else
1689                         pmc_prev = pmc;
1690         }
1691         spin_unlock(&idev->mc_lock);
1692
1693         /* change recs */
1694         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1695                 spin_lock_bh(&pmc->mca_lock);
1696                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1697                         type = MLD2_BLOCK_OLD_SOURCES;
1698                         dtype = MLD2_ALLOW_NEW_SOURCES;
1699                 } else {
1700                         type = MLD2_ALLOW_NEW_SOURCES;
1701                         dtype = MLD2_BLOCK_OLD_SOURCES;
1702                 }
1703                 skb = add_grec(skb, pmc, type, 0, 0);
1704                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1705
1706                 /* filter mode changes */
1707                 if (pmc->mca_crcount) {
1708                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1709                                 type = MLD2_CHANGE_TO_EXCLUDE;
1710                         else
1711                                 type = MLD2_CHANGE_TO_INCLUDE;
1712                         skb = add_grec(skb, pmc, type, 0, 0);
1713                         pmc->mca_crcount--;
1714                 }
1715                 spin_unlock_bh(&pmc->mca_lock);
1716         }
1717         read_unlock_bh(&idev->lock);
1718         if (!skb)
1719                 return;
1720         (void) mld_sendpack(skb);
1721 }
1722
1723 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1724 {
1725         struct net *net = dev_net(dev);
1726         struct sock *sk = net->ipv6.igmp_sk;
1727         struct inet6_dev *idev;
1728         struct sk_buff *skb;
1729         struct mld_msg *hdr;
1730         const struct in6_addr *snd_addr, *saddr;
1731         struct in6_addr addr_buf;
1732         int hlen = LL_RESERVED_SPACE(dev);
1733         int tlen = dev->needed_tailroom;
1734         int err, len, payload_len, full_len;
1735         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1736                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1737                      IPV6_TLV_PADN, 0 };
1738         struct flowi6 fl6;
1739         struct dst_entry *dst;
1740
1741         if (type == ICMPV6_MGM_REDUCTION)
1742                 snd_addr = &in6addr_linklocal_allrouters;
1743         else
1744                 snd_addr = addr;
1745
1746         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1747         payload_len = len + sizeof(ra);
1748         full_len = sizeof(struct ipv6hdr) + payload_len;
1749
1750         rcu_read_lock();
1751         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1752                       IPSTATS_MIB_OUT, full_len);
1753         rcu_read_unlock();
1754
1755         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1756
1757         if (skb == NULL) {
1758                 rcu_read_lock();
1759                 IP6_INC_STATS(net, __in6_dev_get(dev),
1760                               IPSTATS_MIB_OUTDISCARDS);
1761                 rcu_read_unlock();
1762                 return;
1763         }
1764
1765         skb_reserve(skb, hlen);
1766
1767         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1768                 /* <draft-ietf-magma-mld-source-05.txt>:
1769                  * use unspecified address as the source address
1770                  * when a valid link-local address is not available.
1771                  */
1772                 saddr = &in6addr_any;
1773         } else
1774                 saddr = &addr_buf;
1775
1776         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1777
1778         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1779
1780         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1781         memset(hdr, 0, sizeof(struct mld_msg));
1782         hdr->mld_type = type;
1783         hdr->mld_mca = *addr;
1784
1785         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1786                                          IPPROTO_ICMPV6,
1787                                          csum_partial(hdr, len, 0));
1788
1789         rcu_read_lock();
1790         idev = __in6_dev_get(skb->dev);
1791
1792         icmpv6_flow_init(sk, &fl6, type,
1793                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1794                          skb->dev->ifindex);
1795         dst = icmp6_dst_alloc(skb->dev, &fl6);
1796         if (IS_ERR(dst)) {
1797                 err = PTR_ERR(dst);
1798                 goto err_out;
1799         }
1800
1801         skb_dst_set(skb, dst);
1802         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1803                       dst_output);
1804 out:
1805         if (!err) {
1806                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1807                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1808                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1809         } else
1810                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1811
1812         rcu_read_unlock();
1813         return;
1814
1815 err_out:
1816         kfree_skb(skb);
1817         goto out;
1818 }
1819
1820 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1821         const struct in6_addr *psfsrc)
1822 {
1823         struct ip6_sf_list *psf, *psf_prev;
1824         int rv = 0;
1825
1826         psf_prev = NULL;
1827         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1828                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1829                         break;
1830                 psf_prev = psf;
1831         }
1832         if (!psf || psf->sf_count[sfmode] == 0) {
1833                 /* source filter not found, or count wrong =>  bug */
1834                 return -ESRCH;
1835         }
1836         psf->sf_count[sfmode]--;
1837         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1838                 struct inet6_dev *idev = pmc->idev;
1839
1840                 /* no more filters for this source */
1841                 if (psf_prev)
1842                         psf_prev->sf_next = psf->sf_next;
1843                 else
1844                         pmc->mca_sources = psf->sf_next;
1845                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1846                     !MLD_V1_SEEN(idev)) {
1847                         psf->sf_crcount = idev->mc_qrv;
1848                         psf->sf_next = pmc->mca_tomb;
1849                         pmc->mca_tomb = psf;
1850                         rv = 1;
1851                 } else
1852                         kfree(psf);
1853         }
1854         return rv;
1855 }
1856
1857 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1858                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1859                           int delta)
1860 {
1861         struct ifmcaddr6 *pmc;
1862         int     changerec = 0;
1863         int     i, err;
1864
1865         if (!idev)
1866                 return -ENODEV;
1867         read_lock_bh(&idev->lock);
1868         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1869                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1870                         break;
1871         }
1872         if (!pmc) {
1873                 /* MCA not found?? bug */
1874                 read_unlock_bh(&idev->lock);
1875                 return -ESRCH;
1876         }
1877         spin_lock_bh(&pmc->mca_lock);
1878         sf_markstate(pmc);
1879         if (!delta) {
1880                 if (!pmc->mca_sfcount[sfmode]) {
1881                         spin_unlock_bh(&pmc->mca_lock);
1882                         read_unlock_bh(&idev->lock);
1883                         return -EINVAL;
1884                 }
1885                 pmc->mca_sfcount[sfmode]--;
1886         }
1887         err = 0;
1888         for (i=0; i<sfcount; i++) {
1889                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1890
1891                 changerec |= rv > 0;
1892                 if (!err && rv < 0)
1893                         err = rv;
1894         }
1895         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1896             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1897             pmc->mca_sfcount[MCAST_INCLUDE]) {
1898                 struct ip6_sf_list *psf;
1899
1900                 /* filter mode change */
1901                 pmc->mca_sfmode = MCAST_INCLUDE;
1902                 pmc->mca_crcount = idev->mc_qrv;
1903                 idev->mc_ifc_count = pmc->mca_crcount;
1904                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1905                         psf->sf_crcount = 0;
1906                 mld_ifc_event(pmc->idev);
1907         } else if (sf_setstate(pmc) || changerec)
1908                 mld_ifc_event(pmc->idev);
1909         spin_unlock_bh(&pmc->mca_lock);
1910         read_unlock_bh(&idev->lock);
1911         return err;
1912 }
1913
1914 /*
1915  * Add multicast single-source filter to the interface list
1916  */
1917 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1918         const struct in6_addr *psfsrc)
1919 {
1920         struct ip6_sf_list *psf, *psf_prev;
1921
1922         psf_prev = NULL;
1923         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1924                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1925                         break;
1926                 psf_prev = psf;
1927         }
1928         if (!psf) {
1929                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1930                 if (!psf)
1931                         return -ENOBUFS;
1932
1933                 psf->sf_addr = *psfsrc;
1934                 if (psf_prev) {
1935                         psf_prev->sf_next = psf;
1936                 } else
1937                         pmc->mca_sources = psf;
1938         }
1939         psf->sf_count[sfmode]++;
1940         return 0;
1941 }
1942
1943 static void sf_markstate(struct ifmcaddr6 *pmc)
1944 {
1945         struct ip6_sf_list *psf;
1946         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1947
1948         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1949                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1950                         psf->sf_oldin = mca_xcount ==
1951                                 psf->sf_count[MCAST_EXCLUDE] &&
1952                                 !psf->sf_count[MCAST_INCLUDE];
1953                 } else
1954                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1955 }
1956
1957 static int sf_setstate(struct ifmcaddr6 *pmc)
1958 {
1959         struct ip6_sf_list *psf, *dpsf;
1960         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1961         int qrv = pmc->idev->mc_qrv;
1962         int new_in, rv;
1963
1964         rv = 0;
1965         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1966                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1967                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1968                                 !psf->sf_count[MCAST_INCLUDE];
1969                 } else
1970                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1971                 if (new_in) {
1972                         if (!psf->sf_oldin) {
1973                                 struct ip6_sf_list *prev = NULL;
1974
1975                                 for (dpsf=pmc->mca_tomb; dpsf;
1976                                      dpsf=dpsf->sf_next) {
1977                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1978                                             &psf->sf_addr))
1979                                                 break;
1980                                         prev = dpsf;
1981                                 }
1982                                 if (dpsf) {
1983                                         if (prev)
1984                                                 prev->sf_next = dpsf->sf_next;
1985                                         else
1986                                                 pmc->mca_tomb = dpsf->sf_next;
1987                                         kfree(dpsf);
1988                                 }
1989                                 psf->sf_crcount = qrv;
1990                                 rv++;
1991                         }
1992                 } else if (psf->sf_oldin) {
1993                         psf->sf_crcount = 0;
1994                         /*
1995                          * add or update "delete" records if an active filter
1996                          * is now inactive
1997                          */
1998                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1999                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2000                                     &psf->sf_addr))
2001                                         break;
2002                         if (!dpsf) {
2003                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2004                                 if (!dpsf)
2005                                         continue;
2006                                 *dpsf = *psf;
2007                                 /* pmc->mca_lock held by callers */
2008                                 dpsf->sf_next = pmc->mca_tomb;
2009                                 pmc->mca_tomb = dpsf;
2010                         }
2011                         dpsf->sf_crcount = qrv;
2012                         rv++;
2013                 }
2014         }
2015         return rv;
2016 }
2017
2018 /*
2019  * Add multicast source filter list to the interface list
2020  */
2021 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2022                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2023                           int delta)
2024 {
2025         struct ifmcaddr6 *pmc;
2026         int     isexclude;
2027         int     i, err;
2028
2029         if (!idev)
2030                 return -ENODEV;
2031         read_lock_bh(&idev->lock);
2032         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2033                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2034                         break;
2035         }
2036         if (!pmc) {
2037                 /* MCA not found?? bug */
2038                 read_unlock_bh(&idev->lock);
2039                 return -ESRCH;
2040         }
2041         spin_lock_bh(&pmc->mca_lock);
2042
2043         sf_markstate(pmc);
2044         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2045         if (!delta)
2046                 pmc->mca_sfcount[sfmode]++;
2047         err = 0;
2048         for (i=0; i<sfcount; i++) {
2049                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2050                 if (err)
2051                         break;
2052         }
2053         if (err) {
2054                 int j;
2055
2056                 if (!delta)
2057                         pmc->mca_sfcount[sfmode]--;
2058                 for (j=0; j<i; j++)
2059                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2060         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2061                 struct ip6_sf_list *psf;
2062
2063                 /* filter mode change */
2064                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2065                         pmc->mca_sfmode = MCAST_EXCLUDE;
2066                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2067                         pmc->mca_sfmode = MCAST_INCLUDE;
2068                 /* else no filters; keep old mode for reports */
2069
2070                 pmc->mca_crcount = idev->mc_qrv;
2071                 idev->mc_ifc_count = pmc->mca_crcount;
2072                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2073                         psf->sf_crcount = 0;
2074                 mld_ifc_event(idev);
2075         } else if (sf_setstate(pmc))
2076                 mld_ifc_event(idev);
2077         spin_unlock_bh(&pmc->mca_lock);
2078         read_unlock_bh(&idev->lock);
2079         return err;
2080 }
2081
2082 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2083 {
2084         struct ip6_sf_list *psf, *nextpsf;
2085
2086         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2087                 nextpsf = psf->sf_next;
2088                 kfree(psf);
2089         }
2090         pmc->mca_tomb = NULL;
2091         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2092                 nextpsf = psf->sf_next;
2093                 kfree(psf);
2094         }
2095         pmc->mca_sources = NULL;
2096         pmc->mca_sfmode = MCAST_EXCLUDE;
2097         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2098         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2099 }
2100
2101
2102 static void igmp6_join_group(struct ifmcaddr6 *ma)
2103 {
2104         unsigned long delay;
2105
2106         if (ma->mca_flags & MAF_NOREPORT)
2107                 return;
2108
2109         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2110
2111         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2112
2113         spin_lock_bh(&ma->mca_lock);
2114         if (del_timer(&ma->mca_timer)) {
2115                 atomic_dec(&ma->mca_refcnt);
2116                 delay = ma->mca_timer.expires - jiffies;
2117         }
2118
2119         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2120                 atomic_inc(&ma->mca_refcnt);
2121         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2122         spin_unlock_bh(&ma->mca_lock);
2123 }
2124
2125 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2126                             struct inet6_dev *idev)
2127 {
2128         int err;
2129
2130         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2131          * so no other readers or writers of iml or its sflist
2132          */
2133         if (!iml->sflist) {
2134                 /* any-source empty exclude case */
2135                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2136         }
2137         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2138                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2139         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2140         iml->sflist = NULL;
2141         return err;
2142 }
2143
2144 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2145 {
2146         if (MLD_V1_SEEN(ma->idev)) {
2147                 if (ma->mca_flags & MAF_LAST_REPORTER)
2148                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2149                                 ICMPV6_MGM_REDUCTION);
2150         } else {
2151                 mld_add_delrec(ma->idev, ma);
2152                 mld_ifc_event(ma->idev);
2153         }
2154 }
2155
2156 static void mld_gq_timer_expire(unsigned long data)
2157 {
2158         struct inet6_dev *idev = (struct inet6_dev *)data;
2159
2160         idev->mc_gq_running = 0;
2161         mld_send_report(idev, NULL);
2162         in6_dev_put(idev);
2163 }
2164
2165 static void mld_ifc_timer_expire(unsigned long data)
2166 {
2167         struct inet6_dev *idev = (struct inet6_dev *)data;
2168
2169         mld_send_cr(idev);
2170         if (idev->mc_ifc_count) {
2171                 idev->mc_ifc_count--;
2172                 if (idev->mc_ifc_count)
2173                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2174         }
2175         in6_dev_put(idev);
2176 }
2177
2178 static void mld_ifc_event(struct inet6_dev *idev)
2179 {
2180         if (MLD_V1_SEEN(idev))
2181                 return;
2182         idev->mc_ifc_count = idev->mc_qrv;
2183         mld_ifc_start_timer(idev, 1);
2184 }
2185
2186
2187 static void igmp6_timer_handler(unsigned long data)
2188 {
2189         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2190
2191         if (MLD_V1_SEEN(ma->idev))
2192                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2193         else
2194                 mld_send_report(ma->idev, ma);
2195
2196         spin_lock(&ma->mca_lock);
2197         ma->mca_flags |=  MAF_LAST_REPORTER;
2198         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2199         spin_unlock(&ma->mca_lock);
2200         ma_put(ma);
2201 }
2202
2203 /* Device changing type */
2204
2205 void ipv6_mc_unmap(struct inet6_dev *idev)
2206 {
2207         struct ifmcaddr6 *i;
2208
2209         /* Install multicast list, except for all-nodes (already installed) */
2210
2211         read_lock_bh(&idev->lock);
2212         for (i = idev->mc_list; i; i = i->next)
2213                 igmp6_group_dropped(i);
2214         read_unlock_bh(&idev->lock);
2215 }
2216
2217 void ipv6_mc_remap(struct inet6_dev *idev)
2218 {
2219         ipv6_mc_up(idev);
2220 }
2221
2222 /* Device going down */
2223
2224 void ipv6_mc_down(struct inet6_dev *idev)
2225 {
2226         struct ifmcaddr6 *i;
2227
2228         /* Withdraw multicast list */
2229
2230         read_lock_bh(&idev->lock);
2231         idev->mc_ifc_count = 0;
2232         if (del_timer(&idev->mc_ifc_timer))
2233                 __in6_dev_put(idev);
2234         idev->mc_gq_running = 0;
2235         if (del_timer(&idev->mc_gq_timer))
2236                 __in6_dev_put(idev);
2237
2238         for (i = idev->mc_list; i; i=i->next)
2239                 igmp6_group_dropped(i);
2240         read_unlock_bh(&idev->lock);
2241
2242         mld_clear_delrec(idev);
2243 }
2244
2245
2246 /* Device going up */
2247
2248 void ipv6_mc_up(struct inet6_dev *idev)
2249 {
2250         struct ifmcaddr6 *i;
2251
2252         /* Install multicast list, except for all-nodes (already installed) */
2253
2254         read_lock_bh(&idev->lock);
2255         for (i = idev->mc_list; i; i=i->next)
2256                 igmp6_group_added(i);
2257         read_unlock_bh(&idev->lock);
2258 }
2259
2260 /* IPv6 device initialization. */
2261
2262 void ipv6_mc_init_dev(struct inet6_dev *idev)
2263 {
2264         write_lock_bh(&idev->lock);
2265         spin_lock_init(&idev->mc_lock);
2266         idev->mc_gq_running = 0;
2267         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2268                         (unsigned long)idev);
2269         idev->mc_tomb = NULL;
2270         idev->mc_ifc_count = 0;
2271         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2272                         (unsigned long)idev);
2273         idev->mc_qrv = MLD_QRV_DEFAULT;
2274         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2275         idev->mc_v1_seen = 0;
2276         write_unlock_bh(&idev->lock);
2277 }
2278
2279 /*
2280  *      Device is about to be destroyed: clean up.
2281  */
2282
2283 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2284 {
2285         struct ifmcaddr6 *i;
2286
2287         /* Deactivate timers */
2288         ipv6_mc_down(idev);
2289
2290         /* Delete all-nodes address. */
2291         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2292          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2293          * fail.
2294          */
2295         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2296
2297         if (idev->cnf.forwarding)
2298                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2299
2300         write_lock_bh(&idev->lock);
2301         while ((i = idev->mc_list) != NULL) {
2302                 idev->mc_list = i->next;
2303                 write_unlock_bh(&idev->lock);
2304
2305                 igmp6_group_dropped(i);
2306                 ma_put(i);
2307
2308                 write_lock_bh(&idev->lock);
2309         }
2310         write_unlock_bh(&idev->lock);
2311 }
2312
2313 #ifdef CONFIG_PROC_FS
2314 struct igmp6_mc_iter_state {
2315         struct seq_net_private p;
2316         struct net_device *dev;
2317         struct inet6_dev *idev;
2318 };
2319
2320 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2321
2322 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2323 {
2324         struct ifmcaddr6 *im = NULL;
2325         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2326         struct net *net = seq_file_net(seq);
2327
2328         state->idev = NULL;
2329         for_each_netdev_rcu(net, state->dev) {
2330                 struct inet6_dev *idev;
2331                 idev = __in6_dev_get(state->dev);
2332                 if (!idev)
2333                         continue;
2334                 read_lock_bh(&idev->lock);
2335                 im = idev->mc_list;
2336                 if (im) {
2337                         state->idev = idev;
2338                         break;
2339                 }
2340                 read_unlock_bh(&idev->lock);
2341         }
2342         return im;
2343 }
2344
2345 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2346 {
2347         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2348
2349         im = im->next;
2350         while (!im) {
2351                 if (likely(state->idev != NULL))
2352                         read_unlock_bh(&state->idev->lock);
2353
2354                 state->dev = next_net_device_rcu(state->dev);
2355                 if (!state->dev) {
2356                         state->idev = NULL;
2357                         break;
2358                 }
2359                 state->idev = __in6_dev_get(state->dev);
2360                 if (!state->idev)
2361                         continue;
2362                 read_lock_bh(&state->idev->lock);
2363                 im = state->idev->mc_list;
2364         }
2365         return im;
2366 }
2367
2368 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2369 {
2370         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2371         if (im)
2372                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2373                         --pos;
2374         return pos ? NULL : im;
2375 }
2376
2377 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2378         __acquires(RCU)
2379 {
2380         rcu_read_lock();
2381         return igmp6_mc_get_idx(seq, *pos);
2382 }
2383
2384 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2385 {
2386         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2387
2388         ++*pos;
2389         return im;
2390 }
2391
2392 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2393         __releases(RCU)
2394 {
2395         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2396
2397         if (likely(state->idev != NULL)) {
2398                 read_unlock_bh(&state->idev->lock);
2399                 state->idev = NULL;
2400         }
2401         state->dev = NULL;
2402         rcu_read_unlock();
2403 }
2404
2405 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2406 {
2407         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2408         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2409
2410         seq_printf(seq,
2411                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2412                    state->dev->ifindex, state->dev->name,
2413                    &im->mca_addr,
2414                    im->mca_users, im->mca_flags,
2415                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2416                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2417         return 0;
2418 }
2419
2420 static const struct seq_operations igmp6_mc_seq_ops = {
2421         .start  =       igmp6_mc_seq_start,
2422         .next   =       igmp6_mc_seq_next,
2423         .stop   =       igmp6_mc_seq_stop,
2424         .show   =       igmp6_mc_seq_show,
2425 };
2426
2427 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2428 {
2429         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2430                             sizeof(struct igmp6_mc_iter_state));
2431 }
2432
2433 static const struct file_operations igmp6_mc_seq_fops = {
2434         .owner          =       THIS_MODULE,
2435         .open           =       igmp6_mc_seq_open,
2436         .read           =       seq_read,
2437         .llseek         =       seq_lseek,
2438         .release        =       seq_release_net,
2439 };
2440
2441 struct igmp6_mcf_iter_state {
2442         struct seq_net_private p;
2443         struct net_device *dev;
2444         struct inet6_dev *idev;
2445         struct ifmcaddr6 *im;
2446 };
2447
2448 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2449
2450 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2451 {
2452         struct ip6_sf_list *psf = NULL;
2453         struct ifmcaddr6 *im = NULL;
2454         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2455         struct net *net = seq_file_net(seq);
2456
2457         state->idev = NULL;
2458         state->im = NULL;
2459         for_each_netdev_rcu(net, state->dev) {
2460                 struct inet6_dev *idev;
2461                 idev = __in6_dev_get(state->dev);
2462                 if (unlikely(idev == NULL))
2463                         continue;
2464                 read_lock_bh(&idev->lock);
2465                 im = idev->mc_list;
2466                 if (likely(im != NULL)) {
2467                         spin_lock_bh(&im->mca_lock);
2468                         psf = im->mca_sources;
2469                         if (likely(psf != NULL)) {
2470                                 state->im = im;
2471                                 state->idev = idev;
2472                                 break;
2473                         }
2474                         spin_unlock_bh(&im->mca_lock);
2475                 }
2476                 read_unlock_bh(&idev->lock);
2477         }
2478         return psf;
2479 }
2480
2481 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2482 {
2483         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2484
2485         psf = psf->sf_next;
2486         while (!psf) {
2487                 spin_unlock_bh(&state->im->mca_lock);
2488                 state->im = state->im->next;
2489                 while (!state->im) {
2490                         if (likely(state->idev != NULL))
2491                                 read_unlock_bh(&state->idev->lock);
2492
2493                         state->dev = next_net_device_rcu(state->dev);
2494                         if (!state->dev) {
2495                                 state->idev = NULL;
2496                                 goto out;
2497                         }
2498                         state->idev = __in6_dev_get(state->dev);
2499                         if (!state->idev)
2500                                 continue;
2501                         read_lock_bh(&state->idev->lock);
2502                         state->im = state->idev->mc_list;
2503                 }
2504                 if (!state->im)
2505                         break;
2506                 spin_lock_bh(&state->im->mca_lock);
2507                 psf = state->im->mca_sources;
2508         }
2509 out:
2510         return psf;
2511 }
2512
2513 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2514 {
2515         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2516         if (psf)
2517                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2518                         --pos;
2519         return pos ? NULL : psf;
2520 }
2521
2522 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2523         __acquires(RCU)
2524 {
2525         rcu_read_lock();
2526         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2527 }
2528
2529 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2530 {
2531         struct ip6_sf_list *psf;
2532         if (v == SEQ_START_TOKEN)
2533                 psf = igmp6_mcf_get_first(seq);
2534         else
2535                 psf = igmp6_mcf_get_next(seq, v);
2536         ++*pos;
2537         return psf;
2538 }
2539
2540 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2541         __releases(RCU)
2542 {
2543         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2544         if (likely(state->im != NULL)) {
2545                 spin_unlock_bh(&state->im->mca_lock);
2546                 state->im = NULL;
2547         }
2548         if (likely(state->idev != NULL)) {
2549                 read_unlock_bh(&state->idev->lock);
2550                 state->idev = NULL;
2551         }
2552         state->dev = NULL;
2553         rcu_read_unlock();
2554 }
2555
2556 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2557 {
2558         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2559         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2560
2561         if (v == SEQ_START_TOKEN) {
2562                 seq_printf(seq,
2563                            "%3s %6s "
2564                            "%32s %32s %6s %6s\n", "Idx",
2565                            "Device", "Multicast Address",
2566                            "Source Address", "INC", "EXC");
2567         } else {
2568                 seq_printf(seq,
2569                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2570                            state->dev->ifindex, state->dev->name,
2571                            &state->im->mca_addr,
2572                            &psf->sf_addr,
2573                            psf->sf_count[MCAST_INCLUDE],
2574                            psf->sf_count[MCAST_EXCLUDE]);
2575         }
2576         return 0;
2577 }
2578
2579 static const struct seq_operations igmp6_mcf_seq_ops = {
2580         .start  =       igmp6_mcf_seq_start,
2581         .next   =       igmp6_mcf_seq_next,
2582         .stop   =       igmp6_mcf_seq_stop,
2583         .show   =       igmp6_mcf_seq_show,
2584 };
2585
2586 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2587 {
2588         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2589                             sizeof(struct igmp6_mcf_iter_state));
2590 }
2591
2592 static const struct file_operations igmp6_mcf_seq_fops = {
2593         .owner          =       THIS_MODULE,
2594         .open           =       igmp6_mcf_seq_open,
2595         .read           =       seq_read,
2596         .llseek         =       seq_lseek,
2597         .release        =       seq_release_net,
2598 };
2599
2600 static int __net_init igmp6_proc_init(struct net *net)
2601 {
2602         int err;
2603
2604         err = -ENOMEM;
2605         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2606                 goto out;
2607         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2608                          &igmp6_mcf_seq_fops))
2609                 goto out_proc_net_igmp6;
2610
2611         err = 0;
2612 out:
2613         return err;
2614
2615 out_proc_net_igmp6:
2616         remove_proc_entry("igmp6", net->proc_net);
2617         goto out;
2618 }
2619
2620 static void __net_exit igmp6_proc_exit(struct net *net)
2621 {
2622         remove_proc_entry("mcfilter6", net->proc_net);
2623         remove_proc_entry("igmp6", net->proc_net);
2624 }
2625 #else
2626 static inline int igmp6_proc_init(struct net *net)
2627 {
2628         return 0;
2629 }
2630 static inline void igmp6_proc_exit(struct net *net)
2631 {
2632 }
2633 #endif
2634
2635 static int __net_init igmp6_net_init(struct net *net)
2636 {
2637         int err;
2638
2639         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2640                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2641         if (err < 0) {
2642                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2643                        err);
2644                 goto out;
2645         }
2646
2647         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2648
2649         err = igmp6_proc_init(net);
2650         if (err)
2651                 goto out_sock_create;
2652 out:
2653         return err;
2654
2655 out_sock_create:
2656         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2657         goto out;
2658 }
2659
2660 static void __net_exit igmp6_net_exit(struct net *net)
2661 {
2662         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2663         igmp6_proc_exit(net);
2664 }
2665
2666 static struct pernet_operations igmp6_net_ops = {
2667         .init = igmp6_net_init,
2668         .exit = igmp6_net_exit,
2669 };
2670
2671 int __init igmp6_init(void)
2672 {
2673         return register_pernet_subsys(&igmp6_net_ops);
2674 }
2675
2676 void igmp6_cleanup(void)
2677 {
2678         unregister_pernet_subsys(&igmp6_net_ops);
2679 }