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
  47 #include <linux/netfilter.h>
  48 #include <linux/netfilter_ipv6.h>
  49
  50 #include <net/net_namespace.h>
  51 #include <net/sock.h>
  52 #include <net/snmp.h>
  53
  54 #include <net/ipv6.h>
  55 #include <net/protocol.h>
  56 #include <net/if_inet6.h>
  57 #include <net/ndisc.h>
  58 #include <net/addrconf.h>
  59 #include <net/ip6_route.h>
  60 #include <net/inet_common.h>
  61
  62 #include <net/ip6_checksum.h>
  63
  64 /* Set to 3 to get tracing... */
  65 #define MCAST_DEBUG 2
  66
  67 #if MCAST_DEBUG >= 3
  68 #define MDBG(x) printk x
  69 #else
  70 #define MDBG(x)
  71 #endif
  72
  73 /*
  74  *  These header formats should be in a separate include file, but icmpv6.h
  75  *  doesn't have in6_addr defined in all cases, there is no __u128, and no
  76  *  other files reference these.
  77  *
  78  *                      +-DLS 4/14/03
  79  */
  80
  81 /* Multicast Listener Discovery version 2 headers */
  82
  83 struct mld2_grec {
  84         __u8            grec_type;
  85         __u8            grec_auxwords;
  86         __be16          grec_nsrcs;
  87         struct in6_addr grec_mca;
  88         struct in6_addr grec_src[0];
  89 };
  90
  91 struct mld2_report {
  92         __u8    type;
  93         __u8    resv1;
  94         __sum16 csum;
  95         __be16  resv2;
  96         __be16  ngrec;
  97         struct mld2_grec grec[0];
  98 };
  99
 100 struct mld2_query {
 101         __u8 type;
 102         __u8 code;
 103         __sum16 csum;
 104         __be16 mrc;
 105         __be16 resv1;
 106         struct in6_addr mca;
 107 #if defined(__LITTLE_ENDIAN_BITFIELD)
 108         __u8 qrv:3,
 109              suppress:1,
 110              resv2:4;
 111 #elif defined(__BIG_ENDIAN_BITFIELD)
 112         __u8 resv2:4,
 113              suppress:1,
 114              qrv:3;
 115 #else
 116 #error "Please fix <asm/byteorder.h>"
 117 #endif
 118         __u8 qqic;
 119         __be16 nsrcs;
 120         struct in6_addr srcs[0];
 121 };
 122
 123 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 124
 125 /* Big mc list lock for all the sockets */
 126 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
 127
 128 static void igmp6_join_group(struct ifmcaddr6 *ma);
 129 static void igmp6_leave_group(struct ifmcaddr6 *ma);
 130 static void igmp6_timer_handler(unsigned long data);
 131
 132 static void mld_gq_timer_expire(unsigned long data);
 133 static void mld_ifc_timer_expire(unsigned long data);
 134 static void mld_ifc_event(struct inet6_dev *idev);
 135 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 136 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
 137 static void mld_clear_delrec(struct inet6_dev *idev);
 138 static int sf_setstate(struct ifmcaddr6 *pmc);
 139 static void sf_markstate(struct ifmcaddr6 *pmc);
 140 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 141 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 142                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 143                           int delta);
 144 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 145                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 146                           int delta);
 147 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 148                             struct inet6_dev *idev);
 149
 150
 151 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 152 #define MLD_QRV_DEFAULT         2
 153
 154 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 155                 (idev)->cnf.force_mld_version == 1 || \
 156                 ((idev)->mc_v1_seen && \
 157                 time_before(jiffies, (idev)->mc_v1_seen)))
 158
 159 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 160 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
 161         ((value) < (thresh) ? (value) : \
 162         ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
 163         (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 164
 165 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
 166
 167 #define IPV6_MLD_MAX_MSF        64
 168
 169 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 170
 171 /*
 172  *      socket join on multicast group
 173  */
 174
 175 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 176 {
 177         struct net_device *dev = NULL;
 178         struct ipv6_mc_socklist *mc_lst;
 179         struct ipv6_pinfo *np = inet6_sk(sk);
 180         struct net *net = sock_net(sk);
 181         int err;
 182
 183         if (!ipv6_addr_is_multicast(addr))
 184                 return -EINVAL;
 185
 186         read_lock_bh(&ipv6_sk_mc_lock);
 187         for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
 188                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 189                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 190                         read_unlock_bh(&ipv6_sk_mc_lock);
 191                         return -EADDRINUSE;
 192                 }
 193         }
 194         read_unlock_bh(&ipv6_sk_mc_lock);
 195
 196         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 197
 198         if (mc_lst == NULL)
 199                 return -ENOMEM;
 200
 201         mc_lst->next = NULL;
 202         ipv6_addr_copy(&mc_lst->addr, addr);
 203
 204         if (ifindex == 0) {
 205                 struct rt6_info *rt;
 206                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 207                 if (rt) {
 208                         dev = rt->rt6i_dev;
 209                         dev_hold(dev);
 210                         dst_release(&rt->u.dst);
 211                 }
 212         } else
 213                 dev = dev_get_by_index(net, ifindex);
 214
 215         if (dev == NULL) {
 216                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 217                 return -ENODEV;
 218         }
 219
 220         mc_lst->ifindex = dev->ifindex;
 221         mc_lst->sfmode = MCAST_EXCLUDE;
 222         rwlock_init(&mc_lst->sflock);
 223         mc_lst->sflist = NULL;
 224
 225         /*
 226          *      now add/increase the group membership on the device
 227          */
 228
 229         err = ipv6_dev_mc_inc(dev, addr);
 230
 231         if (err) {
 232                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 233                 dev_put(dev);
 234                 return err;
 235         }
 236
 237         write_lock_bh(&ipv6_sk_mc_lock);
 238         mc_lst->next = np->ipv6_mc_list;
 239         np->ipv6_mc_list = mc_lst;
 240         write_unlock_bh(&ipv6_sk_mc_lock);
 241
 242         dev_put(dev);
 243
 244         return 0;
 245 }
 246
 247 /*
 248  *      socket leave on multicast group
 249  */
 250 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 251 {
 252         struct ipv6_pinfo *np = inet6_sk(sk);
 253         struct ipv6_mc_socklist *mc_lst, **lnk;
 254         struct net *net = sock_net(sk);
 255
 256         write_lock_bh(&ipv6_sk_mc_lock);
 257         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 258                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 259                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 260                         struct net_device *dev;
 261
 262                         *lnk = mc_lst->next;
 263                         write_unlock_bh(&ipv6_sk_mc_lock);
 264
 265                         dev = dev_get_by_index(net, mc_lst->ifindex);
 266                         if (dev != NULL) {
 267                                 struct inet6_dev *idev = in6_dev_get(dev);
 268
 269                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 270                                 if (idev) {
 271                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 272                                         in6_dev_put(idev);
 273                                 }
 274                                 dev_put(dev);
 275                         } else
 276                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 277                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 278                         return 0;
 279                 }
 280         }
 281         write_unlock_bh(&ipv6_sk_mc_lock);
 282
 283         return -EADDRNOTAVAIL;
 284 }
 285
 286 static struct inet6_dev *ip6_mc_find_dev(struct net *net,
 287                                          struct in6_addr *group,
 288                                          int ifindex)
 289 {
 290         struct net_device *dev = NULL;
 291         struct inet6_dev *idev = NULL;
 292
 293         if (ifindex == 0) {
 294                 struct rt6_info *rt;
 295
 296                 rt = rt6_lookup(net, group, NULL, 0, 0);
 297                 if (rt) {
 298                         dev = rt->rt6i_dev;
 299                         dev_hold(dev);
 300                         dst_release(&rt->u.dst);
 301                 }
 302         } else
 303                 dev = dev_get_by_index(net, ifindex);
 304
 305         if (!dev)
 306                 goto nodev;
 307         idev = in6_dev_get(dev);
 308         if (!idev)
 309                 goto release;
 310         read_lock_bh(&idev->lock);
 311         if (idev->dead)
 312                 goto unlock_release;
 313
 314         return idev;
 315
 316 unlock_release:
 317         read_unlock_bh(&idev->lock);
 318         in6_dev_put(idev);
 319 release:
 320         dev_put(dev);
 321 nodev:
 322         return NULL;
 323 }
 324
 325 void ipv6_sock_mc_close(struct sock *sk)
 326 {
 327         struct ipv6_pinfo *np = inet6_sk(sk);
 328         struct ipv6_mc_socklist *mc_lst;
 329         struct net *net = sock_net(sk);
 330
 331         write_lock_bh(&ipv6_sk_mc_lock);
 332         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 333                 struct net_device *dev;
 334
 335                 np->ipv6_mc_list = mc_lst->next;
 336                 write_unlock_bh(&ipv6_sk_mc_lock);
 337
 338                 dev = dev_get_by_index(net, mc_lst->ifindex);
 339                 if (dev) {
 340                         struct inet6_dev *idev = in6_dev_get(dev);
 341
 342                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 343                         if (idev) {
 344                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 345                                 in6_dev_put(idev);
 346                         }
 347                         dev_put(dev);
 348                 } else
 349                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 350
 351                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 352
 353                 write_lock_bh(&ipv6_sk_mc_lock);
 354         }
 355         write_unlock_bh(&ipv6_sk_mc_lock);
 356 }
 357
 358 int ip6_mc_source(int add, int omode, struct sock *sk,
 359         struct group_source_req *pgsr)
 360 {
 361         struct in6_addr *source, *group;
 362         struct ipv6_mc_socklist *pmc;
 363         struct net_device *dev;
 364         struct inet6_dev *idev;
 365         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 366         struct ip6_sf_socklist *psl;
 367         struct net *net = sock_net(sk);
 368         int i, j, rv;
 369         int leavegroup = 0;
 370         int pmclocked = 0;
 371         int err;
 372
 373         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 374         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 375
 376         if (!ipv6_addr_is_multicast(group))
 377                 return -EINVAL;
 378
 379         idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
 380         if (!idev)
 381                 return -ENODEV;
 382         dev = idev->dev;
 383
 384         err = -EADDRNOTAVAIL;
 385
 386         read_lock_bh(&ipv6_sk_mc_lock);
 387         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 388                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 389                         continue;
 390                 if (ipv6_addr_equal(&pmc->addr, group))
 391                         break;
 392         }
 393         if (!pmc) {             /* must have a prior join */
 394                 err = -EINVAL;
 395                 goto done;
 396         }
 397         /* if a source filter was set, must be the same mode as before */
 398         if (pmc->sflist) {
 399                 if (pmc->sfmode != omode) {
 400                         err = -EINVAL;
 401                         goto done;
 402                 }
 403         } else if (pmc->sfmode != omode) {
 404                 /* allow mode switches for empty-set filters */
 405                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 406                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 407                 pmc->sfmode = omode;
 408         }
 409
 410         write_lock_bh(&pmc->sflock);
 411         pmclocked = 1;
 412
 413         psl = pmc->sflist;
 414         if (!add) {
 415                 if (!psl)
 416                         goto done;      /* err = -EADDRNOTAVAIL */
 417                 rv = !0;
 418                 for (i=0; i<psl->sl_count; i++) {
 419                         rv = memcmp(&psl->sl_addr[i], source,
 420                                 sizeof(struct in6_addr));
 421                         if (rv == 0)
 422                                 break;
 423                 }
 424                 if (rv)         /* source not found */
 425                         goto done;      /* err = -EADDRNOTAVAIL */
 426
 427                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 428                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 429                         leavegroup = 1;
 430                         goto done;
 431                 }
 432
 433                 /* update the interface filter */
 434                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 435
 436                 for (j=i+1; j<psl->sl_count; j++)
 437                         psl->sl_addr[j-1] = psl->sl_addr[j];
 438                 psl->sl_count--;
 439                 err = 0;
 440                 goto done;
 441         }
 442         /* else, add a new source to the filter */
 443
 444         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 445                 err = -ENOBUFS;
 446                 goto done;
 447         }
 448         if (!psl || psl->sl_count == psl->sl_max) {
 449                 struct ip6_sf_socklist *newpsl;
 450                 int count = IP6_SFBLOCK;
 451
 452                 if (psl)
 453                         count += psl->sl_max;
 454                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 455                 if (!newpsl) {
 456                         err = -ENOBUFS;
 457                         goto done;
 458                 }
 459                 newpsl->sl_max = count;
 460                 newpsl->sl_count = count - IP6_SFBLOCK;
 461                 if (psl) {
 462                         for (i=0; i<psl->sl_count; i++)
 463                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 464                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 465                 }
 466                 pmc->sflist = psl = newpsl;
 467         }
 468         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 469         for (i=0; i<psl->sl_count; i++) {
 470                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 471                 if (rv == 0)
 472                         break;
 473         }
 474         if (rv == 0)            /* address already there is an error */
 475                 goto done;
 476         for (j=psl->sl_count-1; j>=i; j--)
 477                 psl->sl_addr[j+1] = psl->sl_addr[j];
 478         psl->sl_addr[i] = *source;
 479         psl->sl_count++;
 480         err = 0;
 481         /* update the interface list */
 482         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 483 done:
 484         if (pmclocked)
 485                 write_unlock_bh(&pmc->sflock);
 486         read_unlock_bh(&ipv6_sk_mc_lock);
 487         read_unlock_bh(&idev->lock);
 488         in6_dev_put(idev);
 489         dev_put(dev);
 490         if (leavegroup)
 491                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 492         return err;
 493 }
 494
 495 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 496 {
 497         struct in6_addr *group;
 498         struct ipv6_mc_socklist *pmc;
 499         struct net_device *dev;
 500         struct inet6_dev *idev;
 501         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 502         struct ip6_sf_socklist *newpsl, *psl;
 503         struct net *net = sock_net(sk);
 504         int leavegroup = 0;
 505         int i, err;
 506
 507         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 508
 509         if (!ipv6_addr_is_multicast(group))
 510                 return -EINVAL;
 511         if (gsf->gf_fmode != MCAST_INCLUDE &&
 512             gsf->gf_fmode != MCAST_EXCLUDE)
 513                 return -EINVAL;
 514
 515         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 516
 517         if (!idev)
 518                 return -ENODEV;
 519         dev = idev->dev;
 520
 521         err = 0;
 522         read_lock_bh(&ipv6_sk_mc_lock);
 523
 524         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 525                 leavegroup = 1;
 526                 goto done;
 527         }
 528
 529         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 530                 if (pmc->ifindex != gsf->gf_interface)
 531                         continue;
 532                 if (ipv6_addr_equal(&pmc->addr, group))
 533                         break;
 534         }
 535         if (!pmc) {             /* must have a prior join */
 536                 err = -EINVAL;
 537                 goto done;
 538         }
 539         if (gsf->gf_numsrc) {
 540                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 541                                                           GFP_ATOMIC);
 542                 if (!newpsl) {
 543                         err = -ENOBUFS;
 544                         goto done;
 545                 }
 546                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 547                 for (i=0; i<newpsl->sl_count; ++i) {
 548                         struct sockaddr_in6 *psin6;
 549
 550                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 551                         newpsl->sl_addr[i] = psin6->sin6_addr;
 552                 }
 553                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 554                         newpsl->sl_count, newpsl->sl_addr, 0);
 555                 if (err) {
 556                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 557                         goto done;
 558                 }
 559         } else {
 560                 newpsl = NULL;
 561                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 562         }
 563
 564         write_lock_bh(&pmc->sflock);
 565         psl = pmc->sflist;
 566         if (psl) {
 567                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 568                         psl->sl_count, psl->sl_addr, 0);
 569                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 570         } else
 571                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 572         pmc->sflist = newpsl;
 573         pmc->sfmode = gsf->gf_fmode;
 574         write_unlock_bh(&pmc->sflock);
 575         err = 0;
 576 done:
 577         read_unlock_bh(&ipv6_sk_mc_lock);
 578         read_unlock_bh(&idev->lock);
 579         in6_dev_put(idev);
 580         dev_put(dev);
 581         if (leavegroup)
 582                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 583         return err;
 584 }
 585
 586 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 587         struct group_filter __user *optval, int __user *optlen)
 588 {
 589         int err, i, count, copycount;
 590         struct in6_addr *group;
 591         struct ipv6_mc_socklist *pmc;
 592         struct inet6_dev *idev;
 593         struct net_device *dev;
 594         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 595         struct ip6_sf_socklist *psl;
 596         struct net *net = sock_net(sk);
 597
 598         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 599
 600         if (!ipv6_addr_is_multicast(group))
 601                 return -EINVAL;
 602
 603         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 604
 605         if (!idev)
 606                 return -ENODEV;
 607
 608         dev = idev->dev;
 609
 610         err = -EADDRNOTAVAIL;
 611         /*
 612          * changes to the ipv6_mc_list require the socket lock and
 613          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 614          * so reading the list is safe.
 615          */
 616
 617         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 618                 if (pmc->ifindex != gsf->gf_interface)
 619                         continue;
 620                 if (ipv6_addr_equal(group, &pmc->addr))
 621                         break;
 622         }
 623         if (!pmc)               /* must have a prior join */
 624                 goto done;
 625         gsf->gf_fmode = pmc->sfmode;
 626         psl = pmc->sflist;
 627         count = psl ? psl->sl_count : 0;
 628         read_unlock_bh(&idev->lock);
 629         in6_dev_put(idev);
 630         dev_put(dev);
 631
 632         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 633         gsf->gf_numsrc = count;
 634         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 635             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 636                 return -EFAULT;
 637         }
 638         /* changes to psl require the socket lock, a read lock on
 639          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 640          * have the socket lock, so reading here is safe.
 641          */
 642         for (i=0; i<copycount; i++) {
 643                 struct sockaddr_in6 *psin6;
 644                 struct sockaddr_storage ss;
 645
 646                 psin6 = (struct sockaddr_in6 *)&ss;
 647                 memset(&ss, 0, sizeof(ss));
 648                 psin6->sin6_family = AF_INET6;
 649                 psin6->sin6_addr = psl->sl_addr[i];
 650                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 651                         return -EFAULT;
 652         }
 653         return 0;
 654 done:
 655         read_unlock_bh(&idev->lock);
 656         in6_dev_put(idev);
 657         dev_put(dev);
 658         return err;
 659 }
 660
 661 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 662                    const struct in6_addr *src_addr)
 663 {
 664         struct ipv6_pinfo *np = inet6_sk(sk);
 665         struct ipv6_mc_socklist *mc;
 666         struct ip6_sf_socklist *psl;
 667         int rv = 1;
 668
 669         read_lock(&ipv6_sk_mc_lock);
 670         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 671                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 672                         break;
 673         }
 674         if (!mc) {
 675                 read_unlock(&ipv6_sk_mc_lock);
 676                 return 1;
 677         }
 678         read_lock(&mc->sflock);
 679         psl = mc->sflist;
 680         if (!psl) {
 681                 rv = mc->sfmode == MCAST_EXCLUDE;
 682         } else {
 683                 int i;
 684
 685                 for (i=0; i<psl->sl_count; i++) {
 686                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 687                                 break;
 688                 }
 689                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 690                         rv = 0;
 691                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 692                         rv = 0;
 693         }
 694         read_unlock(&mc->sflock);
 695         read_unlock(&ipv6_sk_mc_lock);
 696
 697         return rv;
 698 }
 699
 700 static void ma_put(struct ifmcaddr6 *mc)
 701 {
 702         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 703                 in6_dev_put(mc->idev);
 704                 kfree(mc);
 705         }
 706 }
 707
 708 static void igmp6_group_added(struct ifmcaddr6 *mc)
 709 {
 710         struct net_device *dev = mc->idev->dev;
 711         char buf[MAX_ADDR_LEN];
 712
 713         spin_lock_bh(&mc->mca_lock);
 714         if (!(mc->mca_flags&MAF_LOADED)) {
 715                 mc->mca_flags |= MAF_LOADED;
 716                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 717                         dev_mc_add(dev, buf, dev->addr_len, 0);
 718         }
 719         spin_unlock_bh(&mc->mca_lock);
 720
 721         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 722                 return;
 723
 724         if (MLD_V1_SEEN(mc->idev)) {
 725                 igmp6_join_group(mc);
 726                 return;
 727         }
 728         /* else v2 */
 729
 730         mc->mca_crcount = mc->idev->mc_qrv;
 731         mld_ifc_event(mc->idev);
 732 }
 733
 734 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 735 {
 736         struct net_device *dev = mc->idev->dev;
 737         char buf[MAX_ADDR_LEN];
 738
 739         spin_lock_bh(&mc->mca_lock);
 740         if (mc->mca_flags&MAF_LOADED) {
 741                 mc->mca_flags &= ~MAF_LOADED;
 742                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 743                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 744         }
 745
 746         if (mc->mca_flags & MAF_NOREPORT)
 747                 goto done;
 748         spin_unlock_bh(&mc->mca_lock);
 749
 750         if (!mc->idev->dead)
 751                 igmp6_leave_group(mc);
 752
 753         spin_lock_bh(&mc->mca_lock);
 754         if (del_timer(&mc->mca_timer))
 755                 atomic_dec(&mc->mca_refcnt);
 756 done:
 757         ip6_mc_clear_src(mc);
 758         spin_unlock_bh(&mc->mca_lock);
 759 }
 760
 761 /*
 762  * deleted ifmcaddr6 manipulation
 763  */
 764 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 765 {
 766         struct ifmcaddr6 *pmc;
 767
 768         /* this is an "ifmcaddr6" for convenience; only the fields below
 769          * are actually used. In particular, the refcnt and users are not
 770          * used for management of the delete list. Using the same structure
 771          * for deleted items allows change reports to use common code with
 772          * non-deleted or query-response MCA's.
 773          */
 774         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 775         if (!pmc)
 776                 return;
 777
 778         spin_lock_bh(&im->mca_lock);
 779         spin_lock_init(&pmc->mca_lock);
 780         pmc->idev = im->idev;
 781         in6_dev_hold(idev);
 782         pmc->mca_addr = im->mca_addr;
 783         pmc->mca_crcount = idev->mc_qrv;
 784         pmc->mca_sfmode = im->mca_sfmode;
 785         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 786                 struct ip6_sf_list *psf;
 787
 788                 pmc->mca_tomb = im->mca_tomb;
 789                 pmc->mca_sources = im->mca_sources;
 790                 im->mca_tomb = im->mca_sources = NULL;
 791                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 792                         psf->sf_crcount = pmc->mca_crcount;
 793         }
 794         spin_unlock_bh(&im->mca_lock);
 795
 796         spin_lock_bh(&idev->mc_lock);
 797         pmc->next = idev->mc_tomb;
 798         idev->mc_tomb = pmc;
 799         spin_unlock_bh(&idev->mc_lock);
 800 }
 801
 802 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 803 {
 804         struct ifmcaddr6 *pmc, *pmc_prev;
 805         struct ip6_sf_list *psf, *psf_next;
 806
 807         spin_lock_bh(&idev->mc_lock);
 808         pmc_prev = NULL;
 809         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 810                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 811                         break;
 812                 pmc_prev = pmc;
 813         }
 814         if (pmc) {
 815                 if (pmc_prev)
 816                         pmc_prev->next = pmc->next;
 817                 else
 818                         idev->mc_tomb = pmc->next;
 819         }
 820         spin_unlock_bh(&idev->mc_lock);
 821
 822         if (pmc) {
 823                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 824                         psf_next = psf->sf_next;
 825                         kfree(psf);
 826                 }
 827                 in6_dev_put(pmc->idev);
 828                 kfree(pmc);
 829         }
 830 }
 831
 832 static void mld_clear_delrec(struct inet6_dev *idev)
 833 {
 834         struct ifmcaddr6 *pmc, *nextpmc;
 835
 836         spin_lock_bh(&idev->mc_lock);
 837         pmc = idev->mc_tomb;
 838         idev->mc_tomb = NULL;
 839         spin_unlock_bh(&idev->mc_lock);
 840
 841         for (; pmc; pmc = nextpmc) {
 842                 nextpmc = pmc->next;
 843                 ip6_mc_clear_src(pmc);
 844                 in6_dev_put(pmc->idev);
 845                 kfree(pmc);
 846         }
 847
 848         /* clear dead sources, too */
 849         read_lock_bh(&idev->lock);
 850         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 851                 struct ip6_sf_list *psf, *psf_next;
 852
 853                 spin_lock_bh(&pmc->mca_lock);
 854                 psf = pmc->mca_tomb;
 855                 pmc->mca_tomb = NULL;
 856                 spin_unlock_bh(&pmc->mca_lock);
 857                 for (; psf; psf=psf_next) {
 858                         psf_next = psf->sf_next;
 859                         kfree(psf);
 860                 }
 861         }
 862         read_unlock_bh(&idev->lock);
 863 }
 864
 865
 866 /*
 867  *      device multicast group inc (add if not found)
 868  */
 869 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 870 {
 871         struct ifmcaddr6 *mc;
 872         struct inet6_dev *idev;
 873
 874         idev = in6_dev_get(dev);
 875
 876         if (idev == NULL)
 877                 return -EINVAL;
 878
 879         write_lock_bh(&idev->lock);
 880         if (idev->dead) {
 881                 write_unlock_bh(&idev->lock);
 882                 in6_dev_put(idev);
 883                 return -ENODEV;
 884         }
 885
 886         for (mc = idev->mc_list; mc; mc = mc->next) {
 887                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 888                         mc->mca_users++;
 889                         write_unlock_bh(&idev->lock);
 890                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 891                                 NULL, 0);
 892                         in6_dev_put(idev);
 893                         return 0;
 894                 }
 895         }
 896
 897         /*
 898          *      not found: create a new one.
 899          */
 900
 901         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 902
 903         if (mc == NULL) {
 904                 write_unlock_bh(&idev->lock);
 905                 in6_dev_put(idev);
 906                 return -ENOMEM;
 907         }
 908
 909         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 910
 911         ipv6_addr_copy(&mc->mca_addr, addr);
 912         mc->idev = idev;
 913         mc->mca_users = 1;
 914         /* mca_stamp should be updated upon changes */
 915         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 916         atomic_set(&mc->mca_refcnt, 2);
 917         spin_lock_init(&mc->mca_lock);
 918
 919         /* initial mode is (EX, empty) */
 920         mc->mca_sfmode = MCAST_EXCLUDE;
 921         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 922
 923         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 924             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 925                 mc->mca_flags |= MAF_NOREPORT;
 926
 927         mc->next = idev->mc_list;
 928         idev->mc_list = mc;
 929         write_unlock_bh(&idev->lock);
 930
 931         mld_del_delrec(idev, &mc->mca_addr);
 932         igmp6_group_added(mc);
 933         ma_put(mc);
 934         return 0;
 935 }
 936
 937 /*
 938  *      device multicast group del
 939  */
 940 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 941 {
 942         struct ifmcaddr6 *ma, **map;
 943
 944         write_lock_bh(&idev->lock);
 945         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 946                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 947                         if (--ma->mca_users == 0) {
 948                                 *map = ma->next;
 949                                 write_unlock_bh(&idev->lock);
 950
 951                                 igmp6_group_dropped(ma);
 952
 953                                 ma_put(ma);
 954                                 return 0;
 955                         }
 956                         write_unlock_bh(&idev->lock);
 957                         return 0;
 958                 }
 959         }
 960         write_unlock_bh(&idev->lock);
 961
 962         return -ENOENT;
 963 }
 964
 965 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 966 {
 967         struct inet6_dev *idev = in6_dev_get(dev);
 968         int err;
 969
 970         if (!idev)
 971                 return -ENODEV;
 972
 973         err = __ipv6_dev_mc_dec(idev, addr);
 974
 975         in6_dev_put(idev);
 976
 977         return err;
 978 }
 979
 980 /*
 981  * identify MLD packets for MLD filter exceptions
 982  */
 983 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 984 {
 985         struct icmp6hdr *pic;
 986
 987         if (nexthdr != IPPROTO_ICMPV6)
 988                 return 0;
 989
 990         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 991                 return 0;
 992
 993         pic = icmp6_hdr(skb);
 994
 995         switch (pic->icmp6_type) {
 996         case ICMPV6_MGM_QUERY:
 997         case ICMPV6_MGM_REPORT:
 998         case ICMPV6_MGM_REDUCTION:
 999         case ICMPV6_MLD2_REPORT:
1000                 return 1;
1001         default:
1002                 break;
1003         }
1004         return 0;
1005 }
1006
1007 /*
1008  *      check if the interface/address pair is valid
1009  */
1010 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1011                         const struct in6_addr *src_addr)
1012 {
1013         struct inet6_dev *idev;
1014         struct ifmcaddr6 *mc;
1015         int rv = 0;
1016
1017         idev = in6_dev_get(dev);
1018         if (idev) {
1019                 read_lock_bh(&idev->lock);
1020                 for (mc = idev->mc_list; mc; mc=mc->next) {
1021                         if (ipv6_addr_equal(&mc->mca_addr, group))
1022                                 break;
1023                 }
1024                 if (mc) {
1025                         if (src_addr && !ipv6_addr_any(src_addr)) {
1026                                 struct ip6_sf_list *psf;
1027
1028                                 spin_lock_bh(&mc->mca_lock);
1029                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1030                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1031                                                 break;
1032                                 }
1033                                 if (psf)
1034                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1035                                                 psf->sf_count[MCAST_EXCLUDE] !=
1036                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1037                                 else
1038                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1039                                 spin_unlock_bh(&mc->mca_lock);
1040                         } else
1041                                 rv = 1; /* don't filter unspecified source */
1042                 }
1043                 read_unlock_bh(&idev->lock);
1044                 in6_dev_put(idev);
1045         }
1046         return rv;
1047 }
1048
1049 static void mld_gq_start_timer(struct inet6_dev *idev)
1050 {
1051         int tv = net_random() % idev->mc_maxdelay;
1052
1053         idev->mc_gq_running = 1;
1054         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1055                 in6_dev_hold(idev);
1056 }
1057
1058 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1059 {
1060         int tv = net_random() % delay;
1061
1062         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1063                 in6_dev_hold(idev);
1064 }
1065
1066 /*
1067  *      IGMP handling (alias multicast ICMPv6 messages)
1068  */
1069
1070 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1071 {
1072         unsigned long delay = resptime;
1073
1074         /* Do not start timer for these addresses */
1075         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1076             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1077                 return;
1078
1079         if (del_timer(&ma->mca_timer)) {
1080                 atomic_dec(&ma->mca_refcnt);
1081                 delay = ma->mca_timer.expires - jiffies;
1082         }
1083
1084         if (delay >= resptime) {
1085                 if (resptime)
1086                         delay = net_random() % resptime;
1087                 else
1088                         delay = 1;
1089         }
1090         ma->mca_timer.expires = jiffies + delay;
1091         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1092                 atomic_inc(&ma->mca_refcnt);
1093         ma->mca_flags |= MAF_TIMER_RUNNING;
1094 }
1095
1096 /* mark EXCLUDE-mode sources */
1097 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1098         struct in6_addr *srcs)
1099 {
1100         struct ip6_sf_list *psf;
1101         int i, scount;
1102
1103         scount = 0;
1104         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1105                 if (scount == nsrcs)
1106                         break;
1107                 for (i=0; i<nsrcs; i++) {
1108                         /* skip inactive filters */
1109                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1110                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1111                             psf->sf_count[MCAST_EXCLUDE])
1112                                 continue;
1113                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1114                                 scount++;
1115                                 break;
1116                         }
1117                 }
1118         }
1119         pmc->mca_flags &= ~MAF_GSQUERY;
1120         if (scount == nsrcs)    /* all sources excluded */
1121                 return 0;
1122         return 1;
1123 }
1124
1125 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1126         struct in6_addr *srcs)
1127 {
1128         struct ip6_sf_list *psf;
1129         int i, scount;
1130
1131         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1132                 return mld_xmarksources(pmc, nsrcs, srcs);
1133
1134         /* mark INCLUDE-mode sources */
1135
1136         scount = 0;
1137         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1138                 if (scount == nsrcs)
1139                         break;
1140                 for (i=0; i<nsrcs; i++) {
1141                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1142                                 psf->sf_gsresp = 1;
1143                                 scount++;
1144                                 break;
1145                         }
1146                 }
1147         }
1148         if (!scount) {
1149                 pmc->mca_flags &= ~MAF_GSQUERY;
1150                 return 0;
1151         }
1152         pmc->mca_flags |= MAF_GSQUERY;
1153         return 1;
1154 }
1155
1156 int igmp6_event_query(struct sk_buff *skb)
1157 {
1158         struct mld2_query *mlh2 = NULL;
1159         struct ifmcaddr6 *ma;
1160         struct in6_addr *group;
1161         unsigned long max_delay;
1162         struct inet6_dev *idev;
1163         struct icmp6hdr *hdr;
1164         int group_type;
1165         int mark = 0;
1166         int len;
1167
1168         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1169                 return -EINVAL;
1170
1171         /* compute payload length excluding extension headers */
1172         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1173         len -= skb_network_header_len(skb);
1174
1175         /* Drop queries with not link local source */
1176         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1177                 return -EINVAL;
1178
1179         idev = in6_dev_get(skb->dev);
1180
1181         if (idev == NULL)
1182                 return 0;
1183
1184         hdr = icmp6_hdr(skb);
1185         group = (struct in6_addr *) (hdr + 1);
1186         group_type = ipv6_addr_type(group);
1187
1188         if (group_type != IPV6_ADDR_ANY &&
1189             !(group_type&IPV6_ADDR_MULTICAST)) {
1190                 in6_dev_put(idev);
1191                 return -EINVAL;
1192         }
1193
1194         if (len == 24) {
1195                 int switchback;
1196                 /* MLDv1 router present */
1197
1198                 /* Translate milliseconds to jiffies */
1199                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1200
1201                 switchback = (idev->mc_qrv + 1) * max_delay;
1202                 idev->mc_v1_seen = jiffies + switchback;
1203
1204                 /* cancel the interface change timer */
1205                 idev->mc_ifc_count = 0;
1206                 if (del_timer(&idev->mc_ifc_timer))
1207                         __in6_dev_put(idev);
1208                 /* clear deleted report items */
1209                 mld_clear_delrec(idev);
1210         } else if (len >= 28) {
1211                 int srcs_offset = sizeof(struct mld2_query) -
1212                                   sizeof(struct icmp6hdr);
1213                 if (!pskb_may_pull(skb, srcs_offset)) {
1214                         in6_dev_put(idev);
1215                         return -EINVAL;
1216                 }
1217                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1218                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1219                 if (!max_delay)
1220                         max_delay = 1;
1221                 idev->mc_maxdelay = max_delay;
1222                 if (mlh2->qrv)
1223                         idev->mc_qrv = mlh2->qrv;
1224                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1225                         if (mlh2->nsrcs) {
1226                                 in6_dev_put(idev);
1227                                 return -EINVAL; /* no sources allowed */
1228                         }
1229                         mld_gq_start_timer(idev);
1230                         in6_dev_put(idev);
1231                         return 0;
1232                 }
1233                 /* mark sources to include, if group & source-specific */
1234                 if (mlh2->nsrcs != 0) {
1235                         if (!pskb_may_pull(skb, srcs_offset +
1236                             ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1237                                 in6_dev_put(idev);
1238                                 return -EINVAL;
1239                         }
1240                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1241                         mark = 1;
1242                 }
1243         } else {
1244                 in6_dev_put(idev);
1245                 return -EINVAL;
1246         }
1247
1248         read_lock_bh(&idev->lock);
1249         if (group_type == IPV6_ADDR_ANY) {
1250                 for (ma = idev->mc_list; ma; ma=ma->next) {
1251                         spin_lock_bh(&ma->mca_lock);
1252                         igmp6_group_queried(ma, max_delay);
1253                         spin_unlock_bh(&ma->mca_lock);
1254                 }
1255         } else {
1256                 for (ma = idev->mc_list; ma; ma=ma->next) {
1257                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1258                                 continue;
1259                         spin_lock_bh(&ma->mca_lock);
1260                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1261                                 /* gsquery <- gsquery && mark */
1262                                 if (!mark)
1263                                         ma->mca_flags &= ~MAF_GSQUERY;
1264                         } else {
1265                                 /* gsquery <- mark */
1266                                 if (mark)
1267                                         ma->mca_flags |= MAF_GSQUERY;
1268                                 else
1269                                         ma->mca_flags &= ~MAF_GSQUERY;
1270                         }
1271                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1272                             mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1273                                 igmp6_group_queried(ma, max_delay);
1274                         spin_unlock_bh(&ma->mca_lock);
1275                         break;
1276                 }
1277         }
1278         read_unlock_bh(&idev->lock);
1279         in6_dev_put(idev);
1280
1281         return 0;
1282 }
1283
1284
1285 int igmp6_event_report(struct sk_buff *skb)
1286 {
1287         struct ifmcaddr6 *ma;
1288         struct in6_addr *addrp;
1289         struct inet6_dev *idev;
1290         struct icmp6hdr *hdr;
1291         int addr_type;
1292
1293         /* Our own report looped back. Ignore it. */
1294         if (skb->pkt_type == PACKET_LOOPBACK)
1295                 return 0;
1296
1297         /* send our report if the MC router may not have heard this report */
1298         if (skb->pkt_type != PACKET_MULTICAST &&
1299             skb->pkt_type != PACKET_BROADCAST)
1300                 return 0;
1301
1302         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1303                 return -EINVAL;
1304
1305         hdr = icmp6_hdr(skb);
1306
1307         /* Drop reports with not link local source */
1308         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1309         if (addr_type != IPV6_ADDR_ANY &&
1310             !(addr_type&IPV6_ADDR_LINKLOCAL))
1311                 return -EINVAL;
1312
1313         addrp = (struct in6_addr *) (hdr + 1);
1314
1315         idev = in6_dev_get(skb->dev);
1316         if (idev == NULL)
1317                 return -ENODEV;
1318
1319         /*
1320          *      Cancel the timer for this group
1321          */
1322
1323         read_lock_bh(&idev->lock);
1324         for (ma = idev->mc_list; ma; ma=ma->next) {
1325                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1326                         spin_lock(&ma->mca_lock);
1327                         if (del_timer(&ma->mca_timer))
1328                                 atomic_dec(&ma->mca_refcnt);
1329                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1330                         spin_unlock(&ma->mca_lock);
1331                         break;
1332                 }
1333         }
1334         read_unlock_bh(&idev->lock);
1335         in6_dev_put(idev);
1336         return 0;
1337 }
1338
1339 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1340         int gdeleted, int sdeleted)
1341 {
1342         switch (type) {
1343         case MLD2_MODE_IS_INCLUDE:
1344         case MLD2_MODE_IS_EXCLUDE:
1345                 if (gdeleted || sdeleted)
1346                         return 0;
1347                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1348                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1349                                 return 1;
1350                         /* don't include if this source is excluded
1351                          * in all filters
1352                          */
1353                         if (psf->sf_count[MCAST_INCLUDE])
1354                                 return type == MLD2_MODE_IS_INCLUDE;
1355                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1356                                 psf->sf_count[MCAST_EXCLUDE];
1357                 }
1358                 return 0;
1359         case MLD2_CHANGE_TO_INCLUDE:
1360                 if (gdeleted || sdeleted)
1361                         return 0;
1362                 return psf->sf_count[MCAST_INCLUDE] != 0;
1363         case MLD2_CHANGE_TO_EXCLUDE:
1364                 if (gdeleted || sdeleted)
1365                         return 0;
1366                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1367                     psf->sf_count[MCAST_INCLUDE])
1368                         return 0;
1369                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1370                         psf->sf_count[MCAST_EXCLUDE];
1371         case MLD2_ALLOW_NEW_SOURCES:
1372                 if (gdeleted || !psf->sf_crcount)
1373                         return 0;
1374                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1375         case MLD2_BLOCK_OLD_SOURCES:
1376                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1377                         return gdeleted || (psf->sf_crcount && sdeleted);
1378                 return psf->sf_crcount && !gdeleted && !sdeleted;
1379         }
1380         return 0;
1381 }
1382
1383 static int
1384 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1385 {
1386         struct ip6_sf_list *psf;
1387         int scount = 0;
1388
1389         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1390                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1391                         continue;
1392                 scount++;
1393         }
1394         return scount;
1395 }
1396
1397 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1398 {
1399         struct net *net = dev_net(dev);
1400         struct sock *sk = net->ipv6.igmp_sk;
1401         struct sk_buff *skb;
1402         struct mld2_report *pmr;
1403         struct in6_addr addr_buf;
1404         const struct in6_addr *saddr;
1405         int err;
1406         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1407                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1408                      IPV6_TLV_PADN, 0 };
1409
1410         /* we assume size > sizeof(ra) here */
1411         skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
1412
1413         if (!skb)
1414                 return NULL;
1415
1416         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1417
1418         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1419                 /* <draft-ietf-magma-mld-source-05.txt>:
1420                  * use unspecified address as the source address
1421                  * when a valid link-local address is not available.
1422                  */
1423                 saddr = &in6addr_any;
1424         } else
1425                 saddr = &addr_buf;
1426
1427         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1428
1429         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1430
1431         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1432         skb_put(skb, sizeof(*pmr));
1433         pmr = (struct mld2_report *)skb_transport_header(skb);
1434         pmr->type = ICMPV6_MLD2_REPORT;
1435         pmr->resv1 = 0;
1436         pmr->csum = 0;
1437         pmr->resv2 = 0;
1438         pmr->ngrec = 0;
1439         return skb;
1440 }
1441
1442 static void mld_sendpack(struct sk_buff *skb)
1443 {
1444         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1445         struct mld2_report *pmr =
1446                               (struct mld2_report *)skb_transport_header(skb);
1447         int payload_len, mldlen;
1448         struct inet6_dev *idev = in6_dev_get(skb->dev);
1449         struct net *net = dev_net(skb->dev);
1450         int err;
1451         struct flowi fl;
1452         struct dst_entry *dst;
1453
1454         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1455
1456         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1457         mldlen = skb->tail - skb->transport_header;
1458         pip6->payload_len = htons(payload_len);
1459
1460         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1461                 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1462                                              mldlen, 0));
1463
1464         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1465
1466         if (!dst) {
1467                 err = -ENOMEM;
1468                 goto err_out;
1469         }
1470
1471         icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1472                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1473                          skb->dev->ifindex);
1474
1475         err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1476         skb_dst_set(skb, dst);
1477         if (err)
1478                 goto err_out;
1479
1480         payload_len = skb->len;
1481
1482         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1483                       dst_output);
1484 out:
1485         if (!err) {
1486                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1487                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1488                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1489         } else
1490                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1491
1492         if (likely(idev != NULL))
1493                 in6_dev_put(idev);
1494         return;
1495
1496 err_out:
1497         kfree_skb(skb);
1498         goto out;
1499 }
1500
1501 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1502 {
1503         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1504 }
1505
1506 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1507         int type, struct mld2_grec **ppgr)
1508 {
1509         struct net_device *dev = pmc->idev->dev;
1510         struct mld2_report *pmr;
1511         struct mld2_grec *pgr;
1512
1513         if (!skb)
1514                 skb = mld_newpack(dev, dev->mtu);
1515         if (!skb)
1516                 return NULL;
1517         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1518         pgr->grec_type = type;
1519         pgr->grec_auxwords = 0;
1520         pgr->grec_nsrcs = 0;
1521         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1522         pmr = (struct mld2_report *)skb_transport_header(skb);
1523         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1524         *ppgr = pgr;
1525         return skb;
1526 }
1527
1528 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1529         skb_tailroom(skb)) : 0)
1530
1531 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1532         int type, int gdeleted, int sdeleted)
1533 {
1534         struct net_device *dev = pmc->idev->dev;
1535         struct mld2_report *pmr;
1536         struct mld2_grec *pgr = NULL;
1537         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1538         int scount, stotal, first, isquery, truncate;
1539
1540         if (pmc->mca_flags & MAF_NOREPORT)
1541                 return skb;
1542
1543         isquery = type == MLD2_MODE_IS_INCLUDE ||
1544                   type == MLD2_MODE_IS_EXCLUDE;
1545         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1546                     type == MLD2_CHANGE_TO_EXCLUDE;
1547
1548         stotal = scount = 0;
1549
1550         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1551
1552         if (!*psf_list)
1553                 goto empty_source;
1554
1555         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1556
1557         /* EX and TO_EX get a fresh packet, if needed */
1558         if (truncate) {
1559                 if (pmr && pmr->ngrec &&
1560                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1561                         if (skb)
1562                                 mld_sendpack(skb);
1563                         skb = mld_newpack(dev, dev->mtu);
1564                 }
1565         }
1566         first = 1;
1567         psf_prev = NULL;
1568         for (psf=*psf_list; psf; psf=psf_next) {
1569                 struct in6_addr *psrc;
1570
1571                 psf_next = psf->sf_next;
1572
1573                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1574                         psf_prev = psf;
1575                         continue;
1576                 }
1577
1578                 /* clear marks on query responses */
1579                 if (isquery)
1580                         psf->sf_gsresp = 0;
1581
1582                 if (AVAILABLE(skb) < sizeof(*psrc) +
1583                     first*sizeof(struct mld2_grec)) {
1584                         if (truncate && !first)
1585                                 break;   /* truncate these */
1586                         if (pgr)
1587                                 pgr->grec_nsrcs = htons(scount);
1588                         if (skb)
1589                                 mld_sendpack(skb);
1590                         skb = mld_newpack(dev, dev->mtu);
1591                         first = 1;
1592                         scount = 0;
1593                 }
1594                 if (first) {
1595                         skb = add_grhead(skb, pmc, type, &pgr);
1596                         first = 0;
1597                 }
1598                 if (!skb)
1599                         return NULL;
1600                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1601                 *psrc = psf->sf_addr;
1602                 scount++; stotal++;
1603                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1604                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1605                         psf->sf_crcount--;
1606                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1607                                 if (psf_prev)
1608                                         psf_prev->sf_next = psf->sf_next;
1609                                 else
1610                                         *psf_list = psf->sf_next;
1611                                 kfree(psf);
1612                                 continue;
1613                         }
1614                 }
1615                 psf_prev = psf;
1616         }
1617
1618 empty_source:
1619         if (!stotal) {
1620                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1621                     type == MLD2_BLOCK_OLD_SOURCES)
1622                         return skb;
1623                 if (pmc->mca_crcount || isquery) {
1624                         /* make sure we have room for group header */
1625                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1626                                 mld_sendpack(skb);
1627                                 skb = NULL; /* add_grhead will get a new one */
1628                         }
1629                         skb = add_grhead(skb, pmc, type, &pgr);
1630                 }
1631         }
1632         if (pgr)
1633                 pgr->grec_nsrcs = htons(scount);
1634
1635         if (isquery)
1636                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1637         return skb;
1638 }
1639
1640 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1641 {
1642         struct sk_buff *skb = NULL;
1643         int type;
1644
1645         if (!pmc) {
1646                 read_lock_bh(&idev->lock);
1647                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1648                         if (pmc->mca_flags & MAF_NOREPORT)
1649                                 continue;
1650                         spin_lock_bh(&pmc->mca_lock);
1651                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1652                                 type = MLD2_MODE_IS_EXCLUDE;
1653                         else
1654                                 type = MLD2_MODE_IS_INCLUDE;
1655                         skb = add_grec(skb, pmc, type, 0, 0);
1656                         spin_unlock_bh(&pmc->mca_lock);
1657                 }
1658                 read_unlock_bh(&idev->lock);
1659         } else {
1660                 spin_lock_bh(&pmc->mca_lock);
1661                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1662                         type = MLD2_MODE_IS_EXCLUDE;
1663                 else
1664                         type = MLD2_MODE_IS_INCLUDE;
1665                 skb = add_grec(skb, pmc, type, 0, 0);
1666                 spin_unlock_bh(&pmc->mca_lock);
1667         }
1668         if (skb)
1669                 mld_sendpack(skb);
1670 }
1671
1672 /*
1673  * remove zero-count source records from a source filter list
1674  */
1675 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1676 {
1677         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1678
1679         psf_prev = NULL;
1680         for (psf=*ppsf; psf; psf = psf_next) {
1681                 psf_next = psf->sf_next;
1682                 if (psf->sf_crcount == 0) {
1683                         if (psf_prev)
1684                                 psf_prev->sf_next = psf->sf_next;
1685                         else
1686                                 *ppsf = psf->sf_next;
1687                         kfree(psf);
1688                 } else
1689                         psf_prev = psf;
1690         }
1691 }
1692
1693 static void mld_send_cr(struct inet6_dev *idev)
1694 {
1695         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1696         struct sk_buff *skb = NULL;
1697         int type, dtype;
1698
1699         read_lock_bh(&idev->lock);
1700         spin_lock(&idev->mc_lock);
1701
1702         /* deleted MCA's */
1703         pmc_prev = NULL;
1704         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1705                 pmc_next = pmc->next;
1706                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1707                         type = MLD2_BLOCK_OLD_SOURCES;
1708                         dtype = MLD2_BLOCK_OLD_SOURCES;
1709                         skb = add_grec(skb, pmc, type, 1, 0);
1710                         skb = add_grec(skb, pmc, dtype, 1, 1);
1711                 }
1712                 if (pmc->mca_crcount) {
1713                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1714                                 type = MLD2_CHANGE_TO_INCLUDE;
1715                                 skb = add_grec(skb, pmc, type, 1, 0);
1716                         }
1717                         pmc->mca_crcount--;
1718                         if (pmc->mca_crcount == 0) {
1719                                 mld_clear_zeros(&pmc->mca_tomb);
1720                                 mld_clear_zeros(&pmc->mca_sources);
1721                         }
1722                 }
1723                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1724                     !pmc->mca_sources) {
1725                         if (pmc_prev)
1726                                 pmc_prev->next = pmc_next;
1727                         else
1728                                 idev->mc_tomb = pmc_next;
1729                         in6_dev_put(pmc->idev);
1730                         kfree(pmc);
1731                 } else
1732                         pmc_prev = pmc;
1733         }
1734         spin_unlock(&idev->mc_lock);
1735
1736         /* change recs */
1737         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1738                 spin_lock_bh(&pmc->mca_lock);
1739                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1740                         type = MLD2_BLOCK_OLD_SOURCES;
1741                         dtype = MLD2_ALLOW_NEW_SOURCES;
1742                 } else {
1743                         type = MLD2_ALLOW_NEW_SOURCES;
1744                         dtype = MLD2_BLOCK_OLD_SOURCES;
1745                 }
1746                 skb = add_grec(skb, pmc, type, 0, 0);
1747                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1748
1749                 /* filter mode changes */
1750                 if (pmc->mca_crcount) {
1751                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1752                                 type = MLD2_CHANGE_TO_EXCLUDE;
1753                         else
1754                                 type = MLD2_CHANGE_TO_INCLUDE;
1755                         skb = add_grec(skb, pmc, type, 0, 0);
1756                         pmc->mca_crcount--;
1757                 }
1758                 spin_unlock_bh(&pmc->mca_lock);
1759         }
1760         read_unlock_bh(&idev->lock);
1761         if (!skb)
1762                 return;
1763         (void) mld_sendpack(skb);
1764 }
1765
1766 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1767 {
1768         struct net *net = dev_net(dev);
1769         struct sock *sk = net->ipv6.igmp_sk;
1770         struct inet6_dev *idev;
1771         struct sk_buff *skb;
1772         struct icmp6hdr *hdr;
1773         const struct in6_addr *snd_addr, *saddr;
1774         struct in6_addr *addrp;
1775         struct in6_addr addr_buf;
1776         int err, len, payload_len, full_len;
1777         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1778                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1779                      IPV6_TLV_PADN, 0 };
1780         struct flowi fl;
1781         struct dst_entry *dst;
1782
1783         if (type == ICMPV6_MGM_REDUCTION)
1784                 snd_addr = &in6addr_linklocal_allrouters;
1785         else
1786                 snd_addr = addr;
1787
1788         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1789         payload_len = len + sizeof(ra);
1790         full_len = sizeof(struct ipv6hdr) + payload_len;
1791
1792         rcu_read_lock();
1793         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1794                       IPSTATS_MIB_OUT, full_len);
1795         rcu_read_unlock();
1796
1797         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1798
1799         if (skb == NULL) {
1800                 rcu_read_lock();
1801                 IP6_INC_STATS(net, __in6_dev_get(dev),
1802                               IPSTATS_MIB_OUTDISCARDS);
1803                 rcu_read_unlock();
1804                 return;
1805         }
1806
1807         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1808
1809         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1810                 /* <draft-ietf-magma-mld-source-05.txt>:
1811                  * use unspecified address as the source address
1812                  * when a valid link-local address is not available.
1813                  */
1814                 saddr = &in6addr_any;
1815         } else
1816                 saddr = &addr_buf;
1817
1818         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1819
1820         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1821
1822         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1823         memset(hdr, 0, sizeof(struct icmp6hdr));
1824         hdr->icmp6_type = type;
1825
1826         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1827         ipv6_addr_copy(addrp, addr);
1828
1829         hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1830                                            IPPROTO_ICMPV6,
1831                                            csum_partial(hdr, len, 0));
1832
1833         idev = in6_dev_get(skb->dev);
1834
1835         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1836         if (!dst) {
1837                 err = -ENOMEM;
1838                 goto err_out;
1839         }
1840
1841         icmpv6_flow_init(sk, &fl, type,
1842                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1843                          skb->dev->ifindex);
1844
1845         err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1846         if (err)
1847                 goto err_out;
1848
1849         skb_dst_set(skb, dst);
1850         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1851                       dst_output);
1852 out:
1853         if (!err) {
1854                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1855                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1856                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1857         } else
1858                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1859
1860         if (likely(idev != NULL))
1861                 in6_dev_put(idev);
1862         return;
1863
1864 err_out:
1865         kfree_skb(skb);
1866         goto out;
1867 }
1868
1869 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1870         struct in6_addr *psfsrc)
1871 {
1872         struct ip6_sf_list *psf, *psf_prev;
1873         int rv = 0;
1874
1875         psf_prev = NULL;
1876         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1877                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1878                         break;
1879                 psf_prev = psf;
1880         }
1881         if (!psf || psf->sf_count[sfmode] == 0) {
1882                 /* source filter not found, or count wrong =>  bug */
1883                 return -ESRCH;
1884         }
1885         psf->sf_count[sfmode]--;
1886         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1887                 struct inet6_dev *idev = pmc->idev;
1888
1889                 /* no more filters for this source */
1890                 if (psf_prev)
1891                         psf_prev->sf_next = psf->sf_next;
1892                 else
1893                         pmc->mca_sources = psf->sf_next;
1894                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1895                     !MLD_V1_SEEN(idev)) {
1896                         psf->sf_crcount = idev->mc_qrv;
1897                         psf->sf_next = pmc->mca_tomb;
1898                         pmc->mca_tomb = psf;
1899                         rv = 1;
1900                 } else
1901                         kfree(psf);
1902         }
1903         return rv;
1904 }
1905
1906 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1907                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1908                           int delta)
1909 {
1910         struct ifmcaddr6 *pmc;
1911         int     changerec = 0;
1912         int     i, err;
1913
1914         if (!idev)
1915                 return -ENODEV;
1916         read_lock_bh(&idev->lock);
1917         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1918                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1919                         break;
1920         }
1921         if (!pmc) {
1922                 /* MCA not found?? bug */
1923                 read_unlock_bh(&idev->lock);
1924                 return -ESRCH;
1925         }
1926         spin_lock_bh(&pmc->mca_lock);
1927         sf_markstate(pmc);
1928         if (!delta) {
1929                 if (!pmc->mca_sfcount[sfmode]) {
1930                         spin_unlock_bh(&pmc->mca_lock);
1931                         read_unlock_bh(&idev->lock);
1932                         return -EINVAL;
1933                 }
1934                 pmc->mca_sfcount[sfmode]--;
1935         }
1936         err = 0;
1937         for (i=0; i<sfcount; i++) {
1938                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1939
1940                 changerec |= rv > 0;
1941                 if (!err && rv < 0)
1942                         err = rv;
1943         }
1944         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1945             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1946             pmc->mca_sfcount[MCAST_INCLUDE]) {
1947                 struct ip6_sf_list *psf;
1948
1949                 /* filter mode change */
1950                 pmc->mca_sfmode = MCAST_INCLUDE;
1951                 pmc->mca_crcount = idev->mc_qrv;
1952                 idev->mc_ifc_count = pmc->mca_crcount;
1953                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1954                         psf->sf_crcount = 0;
1955                 mld_ifc_event(pmc->idev);
1956         } else if (sf_setstate(pmc) || changerec)
1957                 mld_ifc_event(pmc->idev);
1958         spin_unlock_bh(&pmc->mca_lock);
1959         read_unlock_bh(&idev->lock);
1960         return err;
1961 }
1962
1963 /*
1964  * Add multicast single-source filter to the interface list
1965  */
1966 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1967         struct in6_addr *psfsrc, int delta)
1968 {
1969         struct ip6_sf_list *psf, *psf_prev;
1970
1971         psf_prev = NULL;
1972         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1973                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1974                         break;
1975                 psf_prev = psf;
1976         }
1977         if (!psf) {
1978                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1979                 if (!psf)
1980                         return -ENOBUFS;
1981
1982                 psf->sf_addr = *psfsrc;
1983                 if (psf_prev) {
1984                         psf_prev->sf_next = psf;
1985                 } else
1986                         pmc->mca_sources = psf;
1987         }
1988         psf->sf_count[sfmode]++;
1989         return 0;
1990 }
1991
1992 static void sf_markstate(struct ifmcaddr6 *pmc)
1993 {
1994         struct ip6_sf_list *psf;
1995         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1996
1997         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1998                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1999                         psf->sf_oldin = mca_xcount ==
2000                                 psf->sf_count[MCAST_EXCLUDE] &&
2001                                 !psf->sf_count[MCAST_INCLUDE];
2002                 } else
2003                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2004 }
2005
2006 static int sf_setstate(struct ifmcaddr6 *pmc)
2007 {
2008         struct ip6_sf_list *psf, *dpsf;
2009         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2010         int qrv = pmc->idev->mc_qrv;
2011         int new_in, rv;
2012
2013         rv = 0;
2014         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2015                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2016                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2017                                 !psf->sf_count[MCAST_INCLUDE];
2018                 } else
2019                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2020                 if (new_in) {
2021                         if (!psf->sf_oldin) {
2022                                 struct ip6_sf_list *prev = NULL;
2023
2024                                 for (dpsf=pmc->mca_tomb; dpsf;
2025                                      dpsf=dpsf->sf_next) {
2026                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2027                                             &psf->sf_addr))
2028                                                 break;
2029                                         prev = dpsf;
2030                                 }
2031                                 if (dpsf) {
2032                                         if (prev)
2033                                                 prev->sf_next = dpsf->sf_next;
2034                                         else
2035                                                 pmc->mca_tomb = dpsf->sf_next;
2036                                         kfree(dpsf);
2037                                 }
2038                                 psf->sf_crcount = qrv;
2039                                 rv++;
2040                         }
2041                 } else if (psf->sf_oldin) {
2042                         psf->sf_crcount = 0;
2043                         /*
2044                          * add or update "delete" records if an active filter
2045                          * is now inactive
2046                          */
2047                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2048                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2049                                     &psf->sf_addr))
2050                                         break;
2051                         if (!dpsf) {
2052                                 dpsf = (struct ip6_sf_list *)
2053                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2054                                 if (!dpsf)
2055                                         continue;
2056                                 *dpsf = *psf;
2057                                 /* pmc->mca_lock held by callers */
2058                                 dpsf->sf_next = pmc->mca_tomb;
2059                                 pmc->mca_tomb = dpsf;
2060                         }
2061                         dpsf->sf_crcount = qrv;
2062                         rv++;
2063                 }
2064         }
2065         return rv;
2066 }
2067
2068 /*
2069  * Add multicast source filter list to the interface list
2070  */
2071 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2072                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2073                           int delta)
2074 {
2075         struct ifmcaddr6 *pmc;
2076         int     isexclude;
2077         int     i, err;
2078
2079         if (!idev)
2080                 return -ENODEV;
2081         read_lock_bh(&idev->lock);
2082         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2083                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2084                         break;
2085         }
2086         if (!pmc) {
2087                 /* MCA not found?? bug */
2088                 read_unlock_bh(&idev->lock);
2089                 return -ESRCH;
2090         }
2091         spin_lock_bh(&pmc->mca_lock);
2092
2093         sf_markstate(pmc);
2094         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2095         if (!delta)
2096                 pmc->mca_sfcount[sfmode]++;
2097         err = 0;
2098         for (i=0; i<sfcount; i++) {
2099                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2100                 if (err)
2101                         break;
2102         }
2103         if (err) {
2104                 int j;
2105
2106                 if (!delta)
2107                         pmc->mca_sfcount[sfmode]--;
2108                 for (j=0; j<i; j++)
2109                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2110         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2111                 struct ip6_sf_list *psf;
2112
2113                 /* filter mode change */
2114                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2115                         pmc->mca_sfmode = MCAST_EXCLUDE;
2116                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2117                         pmc->mca_sfmode = MCAST_INCLUDE;
2118                 /* else no filters; keep old mode for reports */
2119
2120                 pmc->mca_crcount = idev->mc_qrv;
2121                 idev->mc_ifc_count = pmc->mca_crcount;
2122                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2123                         psf->sf_crcount = 0;
2124                 mld_ifc_event(idev);
2125         } else if (sf_setstate(pmc))
2126                 mld_ifc_event(idev);
2127         spin_unlock_bh(&pmc->mca_lock);
2128         read_unlock_bh(&idev->lock);
2129         return err;
2130 }
2131
2132 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2133 {
2134         struct ip6_sf_list *psf, *nextpsf;
2135
2136         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2137                 nextpsf = psf->sf_next;
2138                 kfree(psf);
2139         }
2140         pmc->mca_tomb = NULL;
2141         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2142                 nextpsf = psf->sf_next;
2143                 kfree(psf);
2144         }
2145         pmc->mca_sources = NULL;
2146         pmc->mca_sfmode = MCAST_EXCLUDE;
2147         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2148         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2149 }
2150
2151
2152 static void igmp6_join_group(struct ifmcaddr6 *ma)
2153 {
2154         unsigned long delay;
2155
2156         if (ma->mca_flags & MAF_NOREPORT)
2157                 return;
2158
2159         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2160
2161         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2162
2163         spin_lock_bh(&ma->mca_lock);
2164         if (del_timer(&ma->mca_timer)) {
2165                 atomic_dec(&ma->mca_refcnt);
2166                 delay = ma->mca_timer.expires - jiffies;
2167         }
2168
2169         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2170                 atomic_inc(&ma->mca_refcnt);
2171         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2172         spin_unlock_bh(&ma->mca_lock);
2173 }
2174
2175 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2176                             struct inet6_dev *idev)
2177 {
2178         int err;
2179
2180         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2181          * so no other readers or writers of iml or its sflist
2182          */
2183         if (!iml->sflist) {
2184                 /* any-source empty exclude case */
2185                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2186         }
2187         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2188                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2189         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2190         iml->sflist = NULL;
2191         return err;
2192 }
2193
2194 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2195 {
2196         if (MLD_V1_SEEN(ma->idev)) {
2197                 if (ma->mca_flags & MAF_LAST_REPORTER)
2198                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2199                                 ICMPV6_MGM_REDUCTION);
2200         } else {
2201                 mld_add_delrec(ma->idev, ma);
2202                 mld_ifc_event(ma->idev);
2203         }
2204 }
2205
2206 static void mld_gq_timer_expire(unsigned long data)
2207 {
2208         struct inet6_dev *idev = (struct inet6_dev *)data;
2209
2210         idev->mc_gq_running = 0;
2211         mld_send_report(idev, NULL);
2212         __in6_dev_put(idev);
2213 }
2214
2215 static void mld_ifc_timer_expire(unsigned long data)
2216 {
2217         struct inet6_dev *idev = (struct inet6_dev *)data;
2218
2219         mld_send_cr(idev);
2220         if (idev->mc_ifc_count) {
2221                 idev->mc_ifc_count--;
2222                 if (idev->mc_ifc_count)
2223                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2224         }
2225         __in6_dev_put(idev);
2226 }
2227
2228 static void mld_ifc_event(struct inet6_dev *idev)
2229 {
2230         if (MLD_V1_SEEN(idev))
2231                 return;
2232         idev->mc_ifc_count = idev->mc_qrv;
2233         mld_ifc_start_timer(idev, 1);
2234 }
2235
2236
2237 static void igmp6_timer_handler(unsigned long data)
2238 {
2239         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2240
2241         if (MLD_V1_SEEN(ma->idev))
2242                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2243         else
2244                 mld_send_report(ma->idev, ma);
2245
2246         spin_lock(&ma->mca_lock);
2247         ma->mca_flags |=  MAF_LAST_REPORTER;
2248         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2249         spin_unlock(&ma->mca_lock);
2250         ma_put(ma);
2251 }
2252
2253 /* Device changing type */
2254
2255 void ipv6_mc_unmap(struct inet6_dev *idev)
2256 {
2257         struct ifmcaddr6 *i;
2258
2259         /* Install multicast list, except for all-nodes (already installed) */
2260
2261         read_lock_bh(&idev->lock);
2262         for (i = idev->mc_list; i; i = i->next)
2263                 igmp6_group_dropped(i);
2264         read_unlock_bh(&idev->lock);
2265 }
2266
2267 void ipv6_mc_remap(struct inet6_dev *idev)
2268 {
2269         ipv6_mc_up(idev);
2270 }
2271
2272 /* Device going down */
2273
2274 void ipv6_mc_down(struct inet6_dev *idev)
2275 {
2276         struct ifmcaddr6 *i;
2277
2278         /* Withdraw multicast list */
2279
2280         read_lock_bh(&idev->lock);
2281         idev->mc_ifc_count = 0;
2282         if (del_timer(&idev->mc_ifc_timer))
2283                 __in6_dev_put(idev);
2284         idev->mc_gq_running = 0;
2285         if (del_timer(&idev->mc_gq_timer))
2286                 __in6_dev_put(idev);
2287
2288         for (i = idev->mc_list; i; i=i->next)
2289                 igmp6_group_dropped(i);
2290         read_unlock_bh(&idev->lock);
2291
2292         mld_clear_delrec(idev);
2293 }
2294
2295
2296 /* Device going up */
2297
2298 void ipv6_mc_up(struct inet6_dev *idev)
2299 {
2300         struct ifmcaddr6 *i;
2301
2302         /* Install multicast list, except for all-nodes (already installed) */
2303
2304         read_lock_bh(&idev->lock);
2305         for (i = idev->mc_list; i; i=i->next)
2306                 igmp6_group_added(i);
2307         read_unlock_bh(&idev->lock);
2308 }
2309
2310 /* IPv6 device initialization. */
2311
2312 void ipv6_mc_init_dev(struct inet6_dev *idev)
2313 {
2314         write_lock_bh(&idev->lock);
2315         spin_lock_init(&idev->mc_lock);
2316         idev->mc_gq_running = 0;
2317         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2318                         (unsigned long)idev);
2319         idev->mc_tomb = NULL;
2320         idev->mc_ifc_count = 0;
2321         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2322                         (unsigned long)idev);
2323         idev->mc_qrv = MLD_QRV_DEFAULT;
2324         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2325         idev->mc_v1_seen = 0;
2326         write_unlock_bh(&idev->lock);
2327 }
2328
2329 /*
2330  *      Device is about to be destroyed: clean up.
2331  */
2332
2333 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2334 {
2335         struct ifmcaddr6 *i;
2336
2337         /* Deactivate timers */
2338         ipv6_mc_down(idev);
2339
2340         /* Delete all-nodes address. */
2341         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2342          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2343          * fail.
2344          */
2345         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2346
2347         if (idev->cnf.forwarding)
2348                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2349
2350         write_lock_bh(&idev->lock);
2351         while ((i = idev->mc_list) != NULL) {
2352                 idev->mc_list = i->next;
2353                 write_unlock_bh(&idev->lock);
2354
2355                 igmp6_group_dropped(i);
2356                 ma_put(i);
2357
2358                 write_lock_bh(&idev->lock);
2359         }
2360         write_unlock_bh(&idev->lock);
2361 }
2362
2363 #ifdef CONFIG_PROC_FS
2364 struct igmp6_mc_iter_state {
2365         struct seq_net_private p;
2366         struct net_device *dev;
2367         struct inet6_dev *idev;
2368 };
2369
2370 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2371
2372 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2373 {
2374         struct ifmcaddr6 *im = NULL;
2375         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2376         struct net *net = seq_file_net(seq);
2377
2378         state->idev = NULL;
2379         for_each_netdev_rcu(net, state->dev) {
2380                 struct inet6_dev *idev;
2381                 idev = __in6_dev_get(state->dev);
2382                 if (!idev)
2383                         continue;
2384                 read_lock_bh(&idev->lock);
2385                 im = idev->mc_list;
2386                 if (im) {
2387                         state->idev = idev;
2388                         break;
2389                 }
2390                 read_unlock_bh(&idev->lock);
2391         }
2392         return im;
2393 }
2394
2395 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2396 {
2397         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2398
2399         im = im->next;
2400         while (!im) {
2401                 if (likely(state->idev != NULL))
2402                         read_unlock_bh(&state->idev->lock);
2403
2404                 state->dev = next_net_device_rcu(state->dev);
2405                 if (!state->dev) {
2406                         state->idev = NULL;
2407                         break;
2408                 }
2409                 state->idev = __in6_dev_get(state->dev);
2410                 if (!state->idev)
2411                         continue;
2412                 read_lock_bh(&state->idev->lock);
2413                 im = state->idev->mc_list;
2414         }
2415         return im;
2416 }
2417
2418 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2419 {
2420         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2421         if (im)
2422                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2423                         --pos;
2424         return pos ? NULL : im;
2425 }
2426
2427 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2428         __acquires(RCU)
2429 {
2430         rcu_read_lock();
2431         return igmp6_mc_get_idx(seq, *pos);
2432 }
2433
2434 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2435 {
2436         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2437
2438         ++*pos;
2439         return im;
2440 }
2441
2442 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2443         __releases(RCU)
2444 {
2445         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2446
2447         if (likely(state->idev != NULL)) {
2448                 read_unlock_bh(&state->idev->lock);
2449                 state->idev = NULL;
2450         }
2451         state->dev = NULL;
2452         rcu_read_unlock();
2453 }
2454
2455 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2456 {
2457         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2458         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2459
2460         seq_printf(seq,
2461                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2462                    state->dev->ifindex, state->dev->name,
2463                    &im->mca_addr,
2464                    im->mca_users, im->mca_flags,
2465                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2466                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2467         return 0;
2468 }
2469
2470 static const struct seq_operations igmp6_mc_seq_ops = {
2471         .start  =       igmp6_mc_seq_start,
2472         .next   =       igmp6_mc_seq_next,
2473         .stop   =       igmp6_mc_seq_stop,
2474         .show   =       igmp6_mc_seq_show,
2475 };
2476
2477 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2478 {
2479         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2480                             sizeof(struct igmp6_mc_iter_state));
2481 }
2482
2483 static const struct file_operations igmp6_mc_seq_fops = {
2484         .owner          =       THIS_MODULE,
2485         .open           =       igmp6_mc_seq_open,
2486         .read           =       seq_read,
2487         .llseek         =       seq_lseek,
2488         .release        =       seq_release_net,
2489 };
2490
2491 struct igmp6_mcf_iter_state {
2492         struct seq_net_private p;
2493         struct net_device *dev;
2494         struct inet6_dev *idev;
2495         struct ifmcaddr6 *im;
2496 };
2497
2498 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2499
2500 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2501 {
2502         struct ip6_sf_list *psf = NULL;
2503         struct ifmcaddr6 *im = NULL;
2504         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2505         struct net *net = seq_file_net(seq);
2506
2507         state->idev = NULL;
2508         state->im = NULL;
2509         for_each_netdev_rcu(net, state->dev) {
2510                 struct inet6_dev *idev;
2511                 idev = __in6_dev_get(state->dev);
2512                 if (unlikely(idev == NULL))
2513                         continue;
2514                 read_lock_bh(&idev->lock);
2515                 im = idev->mc_list;
2516                 if (likely(im != NULL)) {
2517                         spin_lock_bh(&im->mca_lock);
2518                         psf = im->mca_sources;
2519                         if (likely(psf != NULL)) {
2520                                 state->im = im;
2521                                 state->idev = idev;
2522                                 break;
2523                         }
2524                         spin_unlock_bh(&im->mca_lock);
2525                 }
2526                 read_unlock_bh(&idev->lock);
2527         }
2528         return psf;
2529 }
2530
2531 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2532 {
2533         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2534
2535         psf = psf->sf_next;
2536         while (!psf) {
2537                 spin_unlock_bh(&state->im->mca_lock);
2538                 state->im = state->im->next;
2539                 while (!state->im) {
2540                         if (likely(state->idev != NULL))
2541                                 read_unlock_bh(&state->idev->lock);
2542
2543                         state->dev = next_net_device_rcu(state->dev);
2544                         if (!state->dev) {
2545                                 state->idev = NULL;
2546                                 goto out;
2547                         }
2548                         state->idev = __in6_dev_get(state->dev);
2549                         if (!state->idev)
2550                                 continue;
2551                         read_lock_bh(&state->idev->lock);
2552                         state->im = state->idev->mc_list;
2553                 }
2554                 if (!state->im)
2555                         break;
2556                 spin_lock_bh(&state->im->mca_lock);
2557                 psf = state->im->mca_sources;
2558         }
2559 out:
2560         return psf;
2561 }
2562
2563 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2564 {
2565         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2566         if (psf)
2567                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2568                         --pos;
2569         return pos ? NULL : psf;
2570 }
2571
2572 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2573         __acquires(RCU)
2574 {
2575         rcu_read_lock();
2576         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2577 }
2578
2579 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2580 {
2581         struct ip6_sf_list *psf;
2582         if (v == SEQ_START_TOKEN)
2583                 psf = igmp6_mcf_get_first(seq);
2584         else
2585                 psf = igmp6_mcf_get_next(seq, v);
2586         ++*pos;
2587         return psf;
2588 }
2589
2590 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2591         __releases(RCU)
2592 {
2593         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2594         if (likely(state->im != NULL)) {
2595                 spin_unlock_bh(&state->im->mca_lock);
2596                 state->im = NULL;
2597         }
2598         if (likely(state->idev != NULL)) {
2599                 read_unlock_bh(&state->idev->lock);
2600                 state->idev = NULL;
2601         }
2602         state->dev = NULL;
2603         rcu_read_unlock();
2604 }
2605
2606 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2607 {
2608         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2609         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2610
2611         if (v == SEQ_START_TOKEN) {
2612                 seq_printf(seq,
2613                            "%3s %6s "
2614                            "%32s %32s %6s %6s\n", "Idx",
2615                            "Device", "Multicast Address",
2616                            "Source Address", "INC", "EXC");
2617         } else {
2618                 seq_printf(seq,
2619                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2620                            state->dev->ifindex, state->dev->name,
2621                            &state->im->mca_addr,
2622                            &psf->sf_addr,
2623                            psf->sf_count[MCAST_INCLUDE],
2624                            psf->sf_count[MCAST_EXCLUDE]);
2625         }
2626         return 0;
2627 }
2628
2629 static const struct seq_operations igmp6_mcf_seq_ops = {
2630         .start  =       igmp6_mcf_seq_start,
2631         .next   =       igmp6_mcf_seq_next,
2632         .stop   =       igmp6_mcf_seq_stop,
2633         .show   =       igmp6_mcf_seq_show,
2634 };
2635
2636 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2637 {
2638         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2639                             sizeof(struct igmp6_mcf_iter_state));
2640 }
2641
2642 static const struct file_operations igmp6_mcf_seq_fops = {
2643         .owner          =       THIS_MODULE,
2644         .open           =       igmp6_mcf_seq_open,
2645         .read           =       seq_read,
2646         .llseek         =       seq_lseek,
2647         .release        =       seq_release_net,
2648 };
2649
2650 static int __net_init igmp6_proc_init(struct net *net)
2651 {
2652         int err;
2653
2654         err = -ENOMEM;
2655         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2656                 goto out;
2657         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2658                                   &igmp6_mcf_seq_fops))
2659                 goto out_proc_net_igmp6;
2660
2661         err = 0;
2662 out:
2663         return err;
2664
2665 out_proc_net_igmp6:
2666         proc_net_remove(net, "igmp6");
2667         goto out;
2668 }
2669
2670 static void __net_exit igmp6_proc_exit(struct net *net)
2671 {
2672         proc_net_remove(net, "mcfilter6");
2673         proc_net_remove(net, "igmp6");
2674 }
2675 #else
2676 static inline int igmp6_proc_init(struct net *net)
2677 {
2678         return 0;
2679 }
2680 static inline void igmp6_proc_exit(struct net *net)
2681 {
2682 }
2683 #endif
2684
2685 static int __net_init igmp6_net_init(struct net *net)
2686 {
2687         int err;
2688
2689         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2690                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2691         if (err < 0) {
2692                 printk(KERN_ERR
2693                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2694                        err);
2695                 goto out;
2696         }
2697
2698         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2699
2700         err = igmp6_proc_init(net);
2701         if (err)
2702                 goto out_sock_create;
2703 out:
2704         return err;
2705
2706 out_sock_create:
2707         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2708         goto out;
2709 }
2710
2711 static void __net_exit igmp6_net_exit(struct net *net)
2712 {
2713         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2714         igmp6_proc_exit(net);
2715 }
2716
2717 static struct pernet_operations igmp6_net_ops = {
2718         .init = igmp6_net_init,
2719         .exit = igmp6_net_exit,
2720 };
2721
2722 int __init igmp6_init(void)
2723 {
2724         return register_pernet_subsys(&igmp6_net_ops);
2725 }
2726
2727 void igmp6_cleanup(void)
2728 {
2729         unregister_pernet_subsys(&igmp6_net_ops);
2730 }