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   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                 return NULL;
 307         idev = in6_dev_get(dev);
 308         if (!idev) {
 309                 dev_put(dev);
 310                 return NULL;
 311         }
 312         read_lock_bh(&idev->lock);
 313         if (idev->dead) {
 314                 read_unlock_bh(&idev->lock);
 315                 in6_dev_put(idev);
 316                 dev_put(dev);
 317                 return NULL;
 318         }
 319         return idev;
 320 }
 321
 322 void ipv6_sock_mc_close(struct sock *sk)
 323 {
 324         struct ipv6_pinfo *np = inet6_sk(sk);
 325         struct ipv6_mc_socklist *mc_lst;
 326         struct net *net = sock_net(sk);
 327
 328         write_lock_bh(&ipv6_sk_mc_lock);
 329         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 330                 struct net_device *dev;
 331
 332                 np->ipv6_mc_list = mc_lst->next;
 333                 write_unlock_bh(&ipv6_sk_mc_lock);
 334
 335                 dev = dev_get_by_index(net, mc_lst->ifindex);
 336                 if (dev) {
 337                         struct inet6_dev *idev = in6_dev_get(dev);
 338
 339                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 340                         if (idev) {
 341                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 342                                 in6_dev_put(idev);
 343                         }
 344                         dev_put(dev);
 345                 } else
 346                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 347
 348                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 349
 350                 write_lock_bh(&ipv6_sk_mc_lock);
 351         }
 352         write_unlock_bh(&ipv6_sk_mc_lock);
 353 }
 354
 355 int ip6_mc_source(int add, int omode, struct sock *sk,
 356         struct group_source_req *pgsr)
 357 {
 358         struct in6_addr *source, *group;
 359         struct ipv6_mc_socklist *pmc;
 360         struct net_device *dev;
 361         struct inet6_dev *idev;
 362         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 363         struct ip6_sf_socklist *psl;
 364         struct net *net = sock_net(sk);
 365         int i, j, rv;
 366         int leavegroup = 0;
 367         int pmclocked = 0;
 368         int err;
 369
 370         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 371         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 372
 373         if (!ipv6_addr_is_multicast(group))
 374                 return -EINVAL;
 375
 376         idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
 377         if (!idev)
 378                 return -ENODEV;
 379         dev = idev->dev;
 380
 381         err = -EADDRNOTAVAIL;
 382
 383         read_lock_bh(&ipv6_sk_mc_lock);
 384         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 385                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 386                         continue;
 387                 if (ipv6_addr_equal(&pmc->addr, group))
 388                         break;
 389         }
 390         if (!pmc) {             /* must have a prior join */
 391                 err = -EINVAL;
 392                 goto done;
 393         }
 394         /* if a source filter was set, must be the same mode as before */
 395         if (pmc->sflist) {
 396                 if (pmc->sfmode != omode) {
 397                         err = -EINVAL;
 398                         goto done;
 399                 }
 400         } else if (pmc->sfmode != omode) {
 401                 /* allow mode switches for empty-set filters */
 402                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 403                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 404                 pmc->sfmode = omode;
 405         }
 406
 407         write_lock_bh(&pmc->sflock);
 408         pmclocked = 1;
 409
 410         psl = pmc->sflist;
 411         if (!add) {
 412                 if (!psl)
 413                         goto done;      /* err = -EADDRNOTAVAIL */
 414                 rv = !0;
 415                 for (i=0; i<psl->sl_count; i++) {
 416                         rv = memcmp(&psl->sl_addr[i], source,
 417                                 sizeof(struct in6_addr));
 418                         if (rv == 0)
 419                                 break;
 420                 }
 421                 if (rv)         /* source not found */
 422                         goto done;      /* err = -EADDRNOTAVAIL */
 423
 424                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 425                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 426                         leavegroup = 1;
 427                         goto done;
 428                 }
 429
 430                 /* update the interface filter */
 431                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 432
 433                 for (j=i+1; j<psl->sl_count; j++)
 434                         psl->sl_addr[j-1] = psl->sl_addr[j];
 435                 psl->sl_count--;
 436                 err = 0;
 437                 goto done;
 438         }
 439         /* else, add a new source to the filter */
 440
 441         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 442                 err = -ENOBUFS;
 443                 goto done;
 444         }
 445         if (!psl || psl->sl_count == psl->sl_max) {
 446                 struct ip6_sf_socklist *newpsl;
 447                 int count = IP6_SFBLOCK;
 448
 449                 if (psl)
 450                         count += psl->sl_max;
 451                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 452                 if (!newpsl) {
 453                         err = -ENOBUFS;
 454                         goto done;
 455                 }
 456                 newpsl->sl_max = count;
 457                 newpsl->sl_count = count - IP6_SFBLOCK;
 458                 if (psl) {
 459                         for (i=0; i<psl->sl_count; i++)
 460                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 461                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 462                 }
 463                 pmc->sflist = psl = newpsl;
 464         }
 465         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 466         for (i=0; i<psl->sl_count; i++) {
 467                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 468                 if (rv == 0)
 469                         break;
 470         }
 471         if (rv == 0)            /* address already there is an error */
 472                 goto done;
 473         for (j=psl->sl_count-1; j>=i; j--)
 474                 psl->sl_addr[j+1] = psl->sl_addr[j];
 475         psl->sl_addr[i] = *source;
 476         psl->sl_count++;
 477         err = 0;
 478         /* update the interface list */
 479         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 480 done:
 481         if (pmclocked)
 482                 write_unlock_bh(&pmc->sflock);
 483         read_unlock_bh(&ipv6_sk_mc_lock);
 484         read_unlock_bh(&idev->lock);
 485         in6_dev_put(idev);
 486         dev_put(dev);
 487         if (leavegroup)
 488                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 489         return err;
 490 }
 491
 492 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 493 {
 494         struct in6_addr *group;
 495         struct ipv6_mc_socklist *pmc;
 496         struct net_device *dev;
 497         struct inet6_dev *idev;
 498         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 499         struct ip6_sf_socklist *newpsl, *psl;
 500         struct net *net = sock_net(sk);
 501         int leavegroup = 0;
 502         int i, err;
 503
 504         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 505
 506         if (!ipv6_addr_is_multicast(group))
 507                 return -EINVAL;
 508         if (gsf->gf_fmode != MCAST_INCLUDE &&
 509             gsf->gf_fmode != MCAST_EXCLUDE)
 510                 return -EINVAL;
 511
 512         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 513
 514         if (!idev)
 515                 return -ENODEV;
 516         dev = idev->dev;
 517
 518         err = 0;
 519         read_lock_bh(&ipv6_sk_mc_lock);
 520
 521         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 522                 leavegroup = 1;
 523                 goto done;
 524         }
 525
 526         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 527                 if (pmc->ifindex != gsf->gf_interface)
 528                         continue;
 529                 if (ipv6_addr_equal(&pmc->addr, group))
 530                         break;
 531         }
 532         if (!pmc) {             /* must have a prior join */
 533                 err = -EINVAL;
 534                 goto done;
 535         }
 536         if (gsf->gf_numsrc) {
 537                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 538                                                           GFP_ATOMIC);
 539                 if (!newpsl) {
 540                         err = -ENOBUFS;
 541                         goto done;
 542                 }
 543                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 544                 for (i=0; i<newpsl->sl_count; ++i) {
 545                         struct sockaddr_in6 *psin6;
 546
 547                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 548                         newpsl->sl_addr[i] = psin6->sin6_addr;
 549                 }
 550                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 551                         newpsl->sl_count, newpsl->sl_addr, 0);
 552                 if (err) {
 553                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 554                         goto done;
 555                 }
 556         } else {
 557                 newpsl = NULL;
 558                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 559         }
 560
 561         write_lock_bh(&pmc->sflock);
 562         psl = pmc->sflist;
 563         if (psl) {
 564                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 565                         psl->sl_count, psl->sl_addr, 0);
 566                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 567         } else
 568                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 569         pmc->sflist = newpsl;
 570         pmc->sfmode = gsf->gf_fmode;
 571         write_unlock_bh(&pmc->sflock);
 572         err = 0;
 573 done:
 574         read_unlock_bh(&ipv6_sk_mc_lock);
 575         read_unlock_bh(&idev->lock);
 576         in6_dev_put(idev);
 577         dev_put(dev);
 578         if (leavegroup)
 579                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 580         return err;
 581 }
 582
 583 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 584         struct group_filter __user *optval, int __user *optlen)
 585 {
 586         int err, i, count, copycount;
 587         struct in6_addr *group;
 588         struct ipv6_mc_socklist *pmc;
 589         struct inet6_dev *idev;
 590         struct net_device *dev;
 591         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 592         struct ip6_sf_socklist *psl;
 593         struct net *net = sock_net(sk);
 594
 595         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 596
 597         if (!ipv6_addr_is_multicast(group))
 598                 return -EINVAL;
 599
 600         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 601
 602         if (!idev)
 603                 return -ENODEV;
 604
 605         dev = idev->dev;
 606
 607         err = -EADDRNOTAVAIL;
 608         /*
 609          * changes to the ipv6_mc_list require the socket lock and
 610          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 611          * so reading the list is safe.
 612          */
 613
 614         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 615                 if (pmc->ifindex != gsf->gf_interface)
 616                         continue;
 617                 if (ipv6_addr_equal(group, &pmc->addr))
 618                         break;
 619         }
 620         if (!pmc)               /* must have a prior join */
 621                 goto done;
 622         gsf->gf_fmode = pmc->sfmode;
 623         psl = pmc->sflist;
 624         count = psl ? psl->sl_count : 0;
 625         read_unlock_bh(&idev->lock);
 626         in6_dev_put(idev);
 627         dev_put(dev);
 628
 629         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 630         gsf->gf_numsrc = count;
 631         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 632             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 633                 return -EFAULT;
 634         }
 635         /* changes to psl require the socket lock, a read lock on
 636          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 637          * have the socket lock, so reading here is safe.
 638          */
 639         for (i=0; i<copycount; i++) {
 640                 struct sockaddr_in6 *psin6;
 641                 struct sockaddr_storage ss;
 642
 643                 psin6 = (struct sockaddr_in6 *)&ss;
 644                 memset(&ss, 0, sizeof(ss));
 645                 psin6->sin6_family = AF_INET6;
 646                 psin6->sin6_addr = psl->sl_addr[i];
 647                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 648                         return -EFAULT;
 649         }
 650         return 0;
 651 done:
 652         read_unlock_bh(&idev->lock);
 653         in6_dev_put(idev);
 654         dev_put(dev);
 655         return err;
 656 }
 657
 658 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 659                    const struct in6_addr *src_addr)
 660 {
 661         struct ipv6_pinfo *np = inet6_sk(sk);
 662         struct ipv6_mc_socklist *mc;
 663         struct ip6_sf_socklist *psl;
 664         int rv = 1;
 665
 666         read_lock(&ipv6_sk_mc_lock);
 667         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 668                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 669                         break;
 670         }
 671         if (!mc) {
 672                 read_unlock(&ipv6_sk_mc_lock);
 673                 return 1;
 674         }
 675         read_lock(&mc->sflock);
 676         psl = mc->sflist;
 677         if (!psl) {
 678                 rv = mc->sfmode == MCAST_EXCLUDE;
 679         } else {
 680                 int i;
 681
 682                 for (i=0; i<psl->sl_count; i++) {
 683                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 684                                 break;
 685                 }
 686                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 687                         rv = 0;
 688                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 689                         rv = 0;
 690         }
 691         read_unlock(&mc->sflock);
 692         read_unlock(&ipv6_sk_mc_lock);
 693
 694         return rv;
 695 }
 696
 697 static void ma_put(struct ifmcaddr6 *mc)
 698 {
 699         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 700                 in6_dev_put(mc->idev);
 701                 kfree(mc);
 702         }
 703 }
 704
 705 static void igmp6_group_added(struct ifmcaddr6 *mc)
 706 {
 707         struct net_device *dev = mc->idev->dev;
 708         char buf[MAX_ADDR_LEN];
 709
 710         spin_lock_bh(&mc->mca_lock);
 711         if (!(mc->mca_flags&MAF_LOADED)) {
 712                 mc->mca_flags |= MAF_LOADED;
 713                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 714                         dev_mc_add(dev, buf, dev->addr_len, 0);
 715         }
 716         spin_unlock_bh(&mc->mca_lock);
 717
 718         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 719                 return;
 720
 721         if (MLD_V1_SEEN(mc->idev)) {
 722                 igmp6_join_group(mc);
 723                 return;
 724         }
 725         /* else v2 */
 726
 727         mc->mca_crcount = mc->idev->mc_qrv;
 728         mld_ifc_event(mc->idev);
 729 }
 730
 731 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 732 {
 733         struct net_device *dev = mc->idev->dev;
 734         char buf[MAX_ADDR_LEN];
 735
 736         spin_lock_bh(&mc->mca_lock);
 737         if (mc->mca_flags&MAF_LOADED) {
 738                 mc->mca_flags &= ~MAF_LOADED;
 739                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 740                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 741         }
 742
 743         if (mc->mca_flags & MAF_NOREPORT)
 744                 goto done;
 745         spin_unlock_bh(&mc->mca_lock);
 746
 747         if (!mc->idev->dead)
 748                 igmp6_leave_group(mc);
 749
 750         spin_lock_bh(&mc->mca_lock);
 751         if (del_timer(&mc->mca_timer))
 752                 atomic_dec(&mc->mca_refcnt);
 753 done:
 754         ip6_mc_clear_src(mc);
 755         spin_unlock_bh(&mc->mca_lock);
 756 }
 757
 758 /*
 759  * deleted ifmcaddr6 manipulation
 760  */
 761 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 762 {
 763         struct ifmcaddr6 *pmc;
 764
 765         /* this is an "ifmcaddr6" for convenience; only the fields below
 766          * are actually used. In particular, the refcnt and users are not
 767          * used for management of the delete list. Using the same structure
 768          * for deleted items allows change reports to use common code with
 769          * non-deleted or query-response MCA's.
 770          */
 771         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 772         if (!pmc)
 773                 return;
 774
 775         spin_lock_bh(&im->mca_lock);
 776         spin_lock_init(&pmc->mca_lock);
 777         pmc->idev = im->idev;
 778         in6_dev_hold(idev);
 779         pmc->mca_addr = im->mca_addr;
 780         pmc->mca_crcount = idev->mc_qrv;
 781         pmc->mca_sfmode = im->mca_sfmode;
 782         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 783                 struct ip6_sf_list *psf;
 784
 785                 pmc->mca_tomb = im->mca_tomb;
 786                 pmc->mca_sources = im->mca_sources;
 787                 im->mca_tomb = im->mca_sources = NULL;
 788                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 789                         psf->sf_crcount = pmc->mca_crcount;
 790         }
 791         spin_unlock_bh(&im->mca_lock);
 792
 793         write_lock_bh(&idev->mc_lock);
 794         pmc->next = idev->mc_tomb;
 795         idev->mc_tomb = pmc;
 796         write_unlock_bh(&idev->mc_lock);
 797 }
 798
 799 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 800 {
 801         struct ifmcaddr6 *pmc, *pmc_prev;
 802         struct ip6_sf_list *psf, *psf_next;
 803
 804         write_lock_bh(&idev->mc_lock);
 805         pmc_prev = NULL;
 806         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 807                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 808                         break;
 809                 pmc_prev = pmc;
 810         }
 811         if (pmc) {
 812                 if (pmc_prev)
 813                         pmc_prev->next = pmc->next;
 814                 else
 815                         idev->mc_tomb = pmc->next;
 816         }
 817         write_unlock_bh(&idev->mc_lock);
 818         if (pmc) {
 819                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 820                         psf_next = psf->sf_next;
 821                         kfree(psf);
 822                 }
 823                 in6_dev_put(pmc->idev);
 824                 kfree(pmc);
 825         }
 826 }
 827
 828 static void mld_clear_delrec(struct inet6_dev *idev)
 829 {
 830         struct ifmcaddr6 *pmc, *nextpmc;
 831
 832         write_lock_bh(&idev->mc_lock);
 833         pmc = idev->mc_tomb;
 834         idev->mc_tomb = NULL;
 835         write_unlock_bh(&idev->mc_lock);
 836
 837         for (; pmc; pmc = nextpmc) {
 838                 nextpmc = pmc->next;
 839                 ip6_mc_clear_src(pmc);
 840                 in6_dev_put(pmc->idev);
 841                 kfree(pmc);
 842         }
 843
 844         /* clear dead sources, too */
 845         read_lock_bh(&idev->lock);
 846         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 847                 struct ip6_sf_list *psf, *psf_next;
 848
 849                 spin_lock_bh(&pmc->mca_lock);
 850                 psf = pmc->mca_tomb;
 851                 pmc->mca_tomb = NULL;
 852                 spin_unlock_bh(&pmc->mca_lock);
 853                 for (; psf; psf=psf_next) {
 854                         psf_next = psf->sf_next;
 855                         kfree(psf);
 856                 }
 857         }
 858         read_unlock_bh(&idev->lock);
 859 }
 860
 861
 862 /*
 863  *      device multicast group inc (add if not found)
 864  */
 865 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 866 {
 867         struct ifmcaddr6 *mc;
 868         struct inet6_dev *idev;
 869
 870         idev = in6_dev_get(dev);
 871
 872         if (idev == NULL)
 873                 return -EINVAL;
 874
 875         write_lock_bh(&idev->lock);
 876         if (idev->dead) {
 877                 write_unlock_bh(&idev->lock);
 878                 in6_dev_put(idev);
 879                 return -ENODEV;
 880         }
 881
 882         for (mc = idev->mc_list; mc; mc = mc->next) {
 883                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 884                         mc->mca_users++;
 885                         write_unlock_bh(&idev->lock);
 886                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 887                                 NULL, 0);
 888                         in6_dev_put(idev);
 889                         return 0;
 890                 }
 891         }
 892
 893         /*
 894          *      not found: create a new one.
 895          */
 896
 897         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 898
 899         if (mc == NULL) {
 900                 write_unlock_bh(&idev->lock);
 901                 in6_dev_put(idev);
 902                 return -ENOMEM;
 903         }
 904
 905         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 906
 907         ipv6_addr_copy(&mc->mca_addr, addr);
 908         mc->idev = idev;
 909         mc->mca_users = 1;
 910         /* mca_stamp should be updated upon changes */
 911         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 912         atomic_set(&mc->mca_refcnt, 2);
 913         spin_lock_init(&mc->mca_lock);
 914
 915         /* initial mode is (EX, empty) */
 916         mc->mca_sfmode = MCAST_EXCLUDE;
 917         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 918
 919         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 920             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 921                 mc->mca_flags |= MAF_NOREPORT;
 922
 923         mc->next = idev->mc_list;
 924         idev->mc_list = mc;
 925         write_unlock_bh(&idev->lock);
 926
 927         mld_del_delrec(idev, &mc->mca_addr);
 928         igmp6_group_added(mc);
 929         ma_put(mc);
 930         return 0;
 931 }
 932
 933 /*
 934  *      device multicast group del
 935  */
 936 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 937 {
 938         struct ifmcaddr6 *ma, **map;
 939
 940         write_lock_bh(&idev->lock);
 941         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 942                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 943                         if (--ma->mca_users == 0) {
 944                                 *map = ma->next;
 945                                 write_unlock_bh(&idev->lock);
 946
 947                                 igmp6_group_dropped(ma);
 948
 949                                 ma_put(ma);
 950                                 return 0;
 951                         }
 952                         write_unlock_bh(&idev->lock);
 953                         return 0;
 954                 }
 955         }
 956         write_unlock_bh(&idev->lock);
 957
 958         return -ENOENT;
 959 }
 960
 961 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 962 {
 963         struct inet6_dev *idev = in6_dev_get(dev);
 964         int err;
 965
 966         if (!idev)
 967                 return -ENODEV;
 968
 969         err = __ipv6_dev_mc_dec(idev, addr);
 970
 971         in6_dev_put(idev);
 972
 973         return err;
 974 }
 975
 976 /*
 977  * identify MLD packets for MLD filter exceptions
 978  */
 979 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 980 {
 981         struct icmp6hdr *pic;
 982
 983         if (nexthdr != IPPROTO_ICMPV6)
 984                 return 0;
 985
 986         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 987                 return 0;
 988
 989         pic = icmp6_hdr(skb);
 990
 991         switch (pic->icmp6_type) {
 992         case ICMPV6_MGM_QUERY:
 993         case ICMPV6_MGM_REPORT:
 994         case ICMPV6_MGM_REDUCTION:
 995         case ICMPV6_MLD2_REPORT:
 996                 return 1;
 997         default:
 998                 break;
 999         }
1000         return 0;
1001 }
1002
1003 /*
1004  *      check if the interface/address pair is valid
1005  */
1006 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1007                         const struct in6_addr *src_addr)
1008 {
1009         struct inet6_dev *idev;
1010         struct ifmcaddr6 *mc;
1011         int rv = 0;
1012
1013         idev = in6_dev_get(dev);
1014         if (idev) {
1015                 read_lock_bh(&idev->lock);
1016                 for (mc = idev->mc_list; mc; mc=mc->next) {
1017                         if (ipv6_addr_equal(&mc->mca_addr, group))
1018                                 break;
1019                 }
1020                 if (mc) {
1021                         if (src_addr && !ipv6_addr_any(src_addr)) {
1022                                 struct ip6_sf_list *psf;
1023
1024                                 spin_lock_bh(&mc->mca_lock);
1025                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1026                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1027                                                 break;
1028                                 }
1029                                 if (psf)
1030                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1031                                                 psf->sf_count[MCAST_EXCLUDE] !=
1032                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1033                                 else
1034                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1035                                 spin_unlock_bh(&mc->mca_lock);
1036                         } else
1037                                 rv = 1; /* don't filter unspecified source */
1038                 }
1039                 read_unlock_bh(&idev->lock);
1040                 in6_dev_put(idev);
1041         }
1042         return rv;
1043 }
1044
1045 static void mld_gq_start_timer(struct inet6_dev *idev)
1046 {
1047         int tv = net_random() % idev->mc_maxdelay;
1048
1049         idev->mc_gq_running = 1;
1050         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1051                 in6_dev_hold(idev);
1052 }
1053
1054 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1055 {
1056         int tv = net_random() % delay;
1057
1058         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1059                 in6_dev_hold(idev);
1060 }
1061
1062 /*
1063  *      IGMP handling (alias multicast ICMPv6 messages)
1064  */
1065
1066 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1067 {
1068         unsigned long delay = resptime;
1069
1070         /* Do not start timer for these addresses */
1071         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1072             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1073                 return;
1074
1075         if (del_timer(&ma->mca_timer)) {
1076                 atomic_dec(&ma->mca_refcnt);
1077                 delay = ma->mca_timer.expires - jiffies;
1078         }
1079
1080         if (delay >= resptime) {
1081                 if (resptime)
1082                         delay = net_random() % resptime;
1083                 else
1084                         delay = 1;
1085         }
1086         ma->mca_timer.expires = jiffies + delay;
1087         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1088                 atomic_inc(&ma->mca_refcnt);
1089         ma->mca_flags |= MAF_TIMER_RUNNING;
1090 }
1091
1092 /* mark EXCLUDE-mode sources */
1093 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1094         struct in6_addr *srcs)
1095 {
1096         struct ip6_sf_list *psf;
1097         int i, scount;
1098
1099         scount = 0;
1100         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1101                 if (scount == nsrcs)
1102                         break;
1103                 for (i=0; i<nsrcs; i++) {
1104                         /* skip inactive filters */
1105                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1106                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1107                             psf->sf_count[MCAST_EXCLUDE])
1108                                 continue;
1109                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1110                                 scount++;
1111                                 break;
1112                         }
1113                 }
1114         }
1115         pmc->mca_flags &= ~MAF_GSQUERY;
1116         if (scount == nsrcs)    /* all sources excluded */
1117                 return 0;
1118         return 1;
1119 }
1120
1121 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1122         struct in6_addr *srcs)
1123 {
1124         struct ip6_sf_list *psf;
1125         int i, scount;
1126
1127         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1128                 return mld_xmarksources(pmc, nsrcs, srcs);
1129
1130         /* mark INCLUDE-mode sources */
1131
1132         scount = 0;
1133         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1134                 if (scount == nsrcs)
1135                         break;
1136                 for (i=0; i<nsrcs; i++) {
1137                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1138                                 psf->sf_gsresp = 1;
1139                                 scount++;
1140                                 break;
1141                         }
1142                 }
1143         }
1144         if (!scount) {
1145                 pmc->mca_flags &= ~MAF_GSQUERY;
1146                 return 0;
1147         }
1148         pmc->mca_flags |= MAF_GSQUERY;
1149         return 1;
1150 }
1151
1152 int igmp6_event_query(struct sk_buff *skb)
1153 {
1154         struct mld2_query *mlh2 = NULL;
1155         struct ifmcaddr6 *ma;
1156         struct in6_addr *group;
1157         unsigned long max_delay;
1158         struct inet6_dev *idev;
1159         struct icmp6hdr *hdr;
1160         int group_type;
1161         int mark = 0;
1162         int len;
1163
1164         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1165                 return -EINVAL;
1166
1167         /* compute payload length excluding extension headers */
1168         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1169         len -= skb_network_header_len(skb);
1170
1171         /* Drop queries with not link local source */
1172         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1173                 return -EINVAL;
1174
1175         idev = in6_dev_get(skb->dev);
1176
1177         if (idev == NULL)
1178                 return 0;
1179
1180         hdr = icmp6_hdr(skb);
1181         group = (struct in6_addr *) (hdr + 1);
1182         group_type = ipv6_addr_type(group);
1183
1184         if (group_type != IPV6_ADDR_ANY &&
1185             !(group_type&IPV6_ADDR_MULTICAST)) {
1186                 in6_dev_put(idev);
1187                 return -EINVAL;
1188         }
1189
1190         if (len == 24) {
1191                 int switchback;
1192                 /* MLDv1 router present */
1193
1194                 /* Translate milliseconds to jiffies */
1195                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1196
1197                 switchback = (idev->mc_qrv + 1) * max_delay;
1198                 idev->mc_v1_seen = jiffies + switchback;
1199
1200                 /* cancel the interface change timer */
1201                 idev->mc_ifc_count = 0;
1202                 if (del_timer(&idev->mc_ifc_timer))
1203                         __in6_dev_put(idev);
1204                 /* clear deleted report items */
1205                 mld_clear_delrec(idev);
1206         } else if (len >= 28) {
1207                 int srcs_offset = sizeof(struct mld2_query) -
1208                                   sizeof(struct icmp6hdr);
1209                 if (!pskb_may_pull(skb, srcs_offset)) {
1210                         in6_dev_put(idev);
1211                         return -EINVAL;
1212                 }
1213                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1214                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1215                 if (!max_delay)
1216                         max_delay = 1;
1217                 idev->mc_maxdelay = max_delay;
1218                 if (mlh2->qrv)
1219                         idev->mc_qrv = mlh2->qrv;
1220                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1221                         if (mlh2->nsrcs) {
1222                                 in6_dev_put(idev);
1223                                 return -EINVAL; /* no sources allowed */
1224                         }
1225                         mld_gq_start_timer(idev);
1226                         in6_dev_put(idev);
1227                         return 0;
1228                 }
1229                 /* mark sources to include, if group & source-specific */
1230                 if (mlh2->nsrcs != 0) {
1231                         if (!pskb_may_pull(skb, srcs_offset +
1232                             ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1233                                 in6_dev_put(idev);
1234                                 return -EINVAL;
1235                         }
1236                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1237                         mark = 1;
1238                 }
1239         } else {
1240                 in6_dev_put(idev);
1241                 return -EINVAL;
1242         }
1243
1244         read_lock_bh(&idev->lock);
1245         if (group_type == IPV6_ADDR_ANY) {
1246                 for (ma = idev->mc_list; ma; ma=ma->next) {
1247                         spin_lock_bh(&ma->mca_lock);
1248                         igmp6_group_queried(ma, max_delay);
1249                         spin_unlock_bh(&ma->mca_lock);
1250                 }
1251         } else {
1252                 for (ma = idev->mc_list; ma; ma=ma->next) {
1253                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1254                                 continue;
1255                         spin_lock_bh(&ma->mca_lock);
1256                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1257                                 /* gsquery <- gsquery && mark */
1258                                 if (!mark)
1259                                         ma->mca_flags &= ~MAF_GSQUERY;
1260                         } else {
1261                                 /* gsquery <- mark */
1262                                 if (mark)
1263                                         ma->mca_flags |= MAF_GSQUERY;
1264                                 else
1265                                         ma->mca_flags &= ~MAF_GSQUERY;
1266                         }
1267                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1268                             mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1269                                 igmp6_group_queried(ma, max_delay);
1270                         spin_unlock_bh(&ma->mca_lock);
1271                         break;
1272                 }
1273         }
1274         read_unlock_bh(&idev->lock);
1275         in6_dev_put(idev);
1276
1277         return 0;
1278 }
1279
1280
1281 int igmp6_event_report(struct sk_buff *skb)
1282 {
1283         struct ifmcaddr6 *ma;
1284         struct in6_addr *addrp;
1285         struct inet6_dev *idev;
1286         struct icmp6hdr *hdr;
1287         int addr_type;
1288
1289         /* Our own report looped back. Ignore it. */
1290         if (skb->pkt_type == PACKET_LOOPBACK)
1291                 return 0;
1292
1293         /* send our report if the MC router may not have heard this report */
1294         if (skb->pkt_type != PACKET_MULTICAST &&
1295             skb->pkt_type != PACKET_BROADCAST)
1296                 return 0;
1297
1298         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1299                 return -EINVAL;
1300
1301         hdr = icmp6_hdr(skb);
1302
1303         /* Drop reports with not link local source */
1304         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1305         if (addr_type != IPV6_ADDR_ANY &&
1306             !(addr_type&IPV6_ADDR_LINKLOCAL))
1307                 return -EINVAL;
1308
1309         addrp = (struct in6_addr *) (hdr + 1);
1310
1311         idev = in6_dev_get(skb->dev);
1312         if (idev == NULL)
1313                 return -ENODEV;
1314
1315         /*
1316          *      Cancel the timer for this group
1317          */
1318
1319         read_lock_bh(&idev->lock);
1320         for (ma = idev->mc_list; ma; ma=ma->next) {
1321                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1322                         spin_lock(&ma->mca_lock);
1323                         if (del_timer(&ma->mca_timer))
1324                                 atomic_dec(&ma->mca_refcnt);
1325                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1326                         spin_unlock(&ma->mca_lock);
1327                         break;
1328                 }
1329         }
1330         read_unlock_bh(&idev->lock);
1331         in6_dev_put(idev);
1332         return 0;
1333 }
1334
1335 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1336         int gdeleted, int sdeleted)
1337 {
1338         switch (type) {
1339         case MLD2_MODE_IS_INCLUDE:
1340         case MLD2_MODE_IS_EXCLUDE:
1341                 if (gdeleted || sdeleted)
1342                         return 0;
1343                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1344                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1345                                 return 1;
1346                         /* don't include if this source is excluded
1347                          * in all filters
1348                          */
1349                         if (psf->sf_count[MCAST_INCLUDE])
1350                                 return type == MLD2_MODE_IS_INCLUDE;
1351                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1352                                 psf->sf_count[MCAST_EXCLUDE];
1353                 }
1354                 return 0;
1355         case MLD2_CHANGE_TO_INCLUDE:
1356                 if (gdeleted || sdeleted)
1357                         return 0;
1358                 return psf->sf_count[MCAST_INCLUDE] != 0;
1359         case MLD2_CHANGE_TO_EXCLUDE:
1360                 if (gdeleted || sdeleted)
1361                         return 0;
1362                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1363                     psf->sf_count[MCAST_INCLUDE])
1364                         return 0;
1365                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1366                         psf->sf_count[MCAST_EXCLUDE];
1367         case MLD2_ALLOW_NEW_SOURCES:
1368                 if (gdeleted || !psf->sf_crcount)
1369                         return 0;
1370                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1371         case MLD2_BLOCK_OLD_SOURCES:
1372                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1373                         return gdeleted || (psf->sf_crcount && sdeleted);
1374                 return psf->sf_crcount && !gdeleted && !sdeleted;
1375         }
1376         return 0;
1377 }
1378
1379 static int
1380 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1381 {
1382         struct ip6_sf_list *psf;
1383         int scount = 0;
1384
1385         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1386                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1387                         continue;
1388                 scount++;
1389         }
1390         return scount;
1391 }
1392
1393 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1394 {
1395         struct net *net = dev_net(dev);
1396         struct sock *sk = net->ipv6.igmp_sk;
1397         struct sk_buff *skb;
1398         struct mld2_report *pmr;
1399         struct in6_addr addr_buf;
1400         const struct in6_addr *saddr;
1401         int err;
1402         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1403                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1404                      IPV6_TLV_PADN, 0 };
1405
1406         /* we assume size > sizeof(ra) here */
1407         skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
1408
1409         if (!skb)
1410                 return NULL;
1411
1412         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1413
1414         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1415                 /* <draft-ietf-magma-mld-source-05.txt>:
1416                  * use unspecified address as the source address
1417                  * when a valid link-local address is not available.
1418                  */
1419                 saddr = &in6addr_any;
1420         } else
1421                 saddr = &addr_buf;
1422
1423         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1424
1425         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1426
1427         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1428         skb_put(skb, sizeof(*pmr));
1429         pmr = (struct mld2_report *)skb_transport_header(skb);
1430         pmr->type = ICMPV6_MLD2_REPORT;
1431         pmr->resv1 = 0;
1432         pmr->csum = 0;
1433         pmr->resv2 = 0;
1434         pmr->ngrec = 0;
1435         return skb;
1436 }
1437
1438 static void mld_sendpack(struct sk_buff *skb)
1439 {
1440         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1441         struct mld2_report *pmr =
1442                               (struct mld2_report *)skb_transport_header(skb);
1443         int payload_len, mldlen;
1444         struct inet6_dev *idev = in6_dev_get(skb->dev);
1445         struct net *net = dev_net(skb->dev);
1446         int err;
1447         struct flowi fl;
1448
1449         IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1450         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1451         mldlen = skb->tail - skb->transport_header;
1452         pip6->payload_len = htons(payload_len);
1453
1454         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1455                 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1456                                              mldlen, 0));
1457
1458         skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1459
1460         if (!skb->dst) {
1461                 err = -ENOMEM;
1462                 goto err_out;
1463         }
1464
1465         icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1466                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1467                          skb->dev->ifindex);
1468
1469         err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1470         if (err)
1471                 goto err_out;
1472
1473         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1474                       dst_output);
1475 out:
1476         if (!err) {
1477                 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1478                 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1479                 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1480         } else
1481                 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1482
1483         if (likely(idev != NULL))
1484                 in6_dev_put(idev);
1485         return;
1486
1487 err_out:
1488         kfree_skb(skb);
1489         goto out;
1490 }
1491
1492 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1493 {
1494         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1495 }
1496
1497 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1498         int type, struct mld2_grec **ppgr)
1499 {
1500         struct net_device *dev = pmc->idev->dev;
1501         struct mld2_report *pmr;
1502         struct mld2_grec *pgr;
1503
1504         if (!skb)
1505                 skb = mld_newpack(dev, dev->mtu);
1506         if (!skb)
1507                 return NULL;
1508         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1509         pgr->grec_type = type;
1510         pgr->grec_auxwords = 0;
1511         pgr->grec_nsrcs = 0;
1512         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1513         pmr = (struct mld2_report *)skb_transport_header(skb);
1514         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1515         *ppgr = pgr;
1516         return skb;
1517 }
1518
1519 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1520         skb_tailroom(skb)) : 0)
1521
1522 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1523         int type, int gdeleted, int sdeleted)
1524 {
1525         struct net_device *dev = pmc->idev->dev;
1526         struct mld2_report *pmr;
1527         struct mld2_grec *pgr = NULL;
1528         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1529         int scount, stotal, first, isquery, truncate;
1530
1531         if (pmc->mca_flags & MAF_NOREPORT)
1532                 return skb;
1533
1534         isquery = type == MLD2_MODE_IS_INCLUDE ||
1535                   type == MLD2_MODE_IS_EXCLUDE;
1536         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1537                     type == MLD2_CHANGE_TO_EXCLUDE;
1538
1539         stotal = scount = 0;
1540
1541         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1542
1543         if (!*psf_list)
1544                 goto empty_source;
1545
1546         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1547
1548         /* EX and TO_EX get a fresh packet, if needed */
1549         if (truncate) {
1550                 if (pmr && pmr->ngrec &&
1551                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1552                         if (skb)
1553                                 mld_sendpack(skb);
1554                         skb = mld_newpack(dev, dev->mtu);
1555                 }
1556         }
1557         first = 1;
1558         psf_prev = NULL;
1559         for (psf=*psf_list; psf; psf=psf_next) {
1560                 struct in6_addr *psrc;
1561
1562                 psf_next = psf->sf_next;
1563
1564                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1565                         psf_prev = psf;
1566                         continue;
1567                 }
1568
1569                 /* clear marks on query responses */
1570                 if (isquery)
1571                         psf->sf_gsresp = 0;
1572
1573                 if (AVAILABLE(skb) < sizeof(*psrc) +
1574                     first*sizeof(struct mld2_grec)) {
1575                         if (truncate && !first)
1576                                 break;   /* truncate these */
1577                         if (pgr)
1578                                 pgr->grec_nsrcs = htons(scount);
1579                         if (skb)
1580                                 mld_sendpack(skb);
1581                         skb = mld_newpack(dev, dev->mtu);
1582                         first = 1;
1583                         scount = 0;
1584                 }
1585                 if (first) {
1586                         skb = add_grhead(skb, pmc, type, &pgr);
1587                         first = 0;
1588                 }
1589                 if (!skb)
1590                         return NULL;
1591                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1592                 *psrc = psf->sf_addr;
1593                 scount++; stotal++;
1594                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1595                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1596                         psf->sf_crcount--;
1597                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1598                                 if (psf_prev)
1599                                         psf_prev->sf_next = psf->sf_next;
1600                                 else
1601                                         *psf_list = psf->sf_next;
1602                                 kfree(psf);
1603                                 continue;
1604                         }
1605                 }
1606                 psf_prev = psf;
1607         }
1608
1609 empty_source:
1610         if (!stotal) {
1611                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1612                     type == MLD2_BLOCK_OLD_SOURCES)
1613                         return skb;
1614                 if (pmc->mca_crcount || isquery) {
1615                         /* make sure we have room for group header */
1616                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1617                                 mld_sendpack(skb);
1618                                 skb = NULL; /* add_grhead will get a new one */
1619                         }
1620                         skb = add_grhead(skb, pmc, type, &pgr);
1621                 }
1622         }
1623         if (pgr)
1624                 pgr->grec_nsrcs = htons(scount);
1625
1626         if (isquery)
1627                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1628         return skb;
1629 }
1630
1631 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1632 {
1633         struct sk_buff *skb = NULL;
1634         int type;
1635
1636         if (!pmc) {
1637                 read_lock_bh(&idev->lock);
1638                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1639                         if (pmc->mca_flags & MAF_NOREPORT)
1640                                 continue;
1641                         spin_lock_bh(&pmc->mca_lock);
1642                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1643                                 type = MLD2_MODE_IS_EXCLUDE;
1644                         else
1645                                 type = MLD2_MODE_IS_INCLUDE;
1646                         skb = add_grec(skb, pmc, type, 0, 0);
1647                         spin_unlock_bh(&pmc->mca_lock);
1648                 }
1649                 read_unlock_bh(&idev->lock);
1650         } else {
1651                 spin_lock_bh(&pmc->mca_lock);
1652                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1653                         type = MLD2_MODE_IS_EXCLUDE;
1654                 else
1655                         type = MLD2_MODE_IS_INCLUDE;
1656                 skb = add_grec(skb, pmc, type, 0, 0);
1657                 spin_unlock_bh(&pmc->mca_lock);
1658         }
1659         if (skb)
1660                 mld_sendpack(skb);
1661 }
1662
1663 /*
1664  * remove zero-count source records from a source filter list
1665  */
1666 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1667 {
1668         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1669
1670         psf_prev = NULL;
1671         for (psf=*ppsf; psf; psf = psf_next) {
1672                 psf_next = psf->sf_next;
1673                 if (psf->sf_crcount == 0) {
1674                         if (psf_prev)
1675                                 psf_prev->sf_next = psf->sf_next;
1676                         else
1677                                 *ppsf = psf->sf_next;
1678                         kfree(psf);
1679                 } else
1680                         psf_prev = psf;
1681         }
1682 }
1683
1684 static void mld_send_cr(struct inet6_dev *idev)
1685 {
1686         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1687         struct sk_buff *skb = NULL;
1688         int type, dtype;
1689
1690         read_lock_bh(&idev->lock);
1691         write_lock_bh(&idev->mc_lock);
1692
1693         /* deleted MCA's */
1694         pmc_prev = NULL;
1695         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1696                 pmc_next = pmc->next;
1697                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1698                         type = MLD2_BLOCK_OLD_SOURCES;
1699                         dtype = MLD2_BLOCK_OLD_SOURCES;
1700                         skb = add_grec(skb, pmc, type, 1, 0);
1701                         skb = add_grec(skb, pmc, dtype, 1, 1);
1702                 }
1703                 if (pmc->mca_crcount) {
1704                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1705                                 type = MLD2_CHANGE_TO_INCLUDE;
1706                                 skb = add_grec(skb, pmc, type, 1, 0);
1707                         }
1708                         pmc->mca_crcount--;
1709                         if (pmc->mca_crcount == 0) {
1710                                 mld_clear_zeros(&pmc->mca_tomb);
1711                                 mld_clear_zeros(&pmc->mca_sources);
1712                         }
1713                 }
1714                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1715                     !pmc->mca_sources) {
1716                         if (pmc_prev)
1717                                 pmc_prev->next = pmc_next;
1718                         else
1719                                 idev->mc_tomb = pmc_next;
1720                         in6_dev_put(pmc->idev);
1721                         kfree(pmc);
1722                 } else
1723                         pmc_prev = pmc;
1724         }
1725         write_unlock_bh(&idev->mc_lock);
1726
1727         /* change recs */
1728         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1729                 spin_lock_bh(&pmc->mca_lock);
1730                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1731                         type = MLD2_BLOCK_OLD_SOURCES;
1732                         dtype = MLD2_ALLOW_NEW_SOURCES;
1733                 } else {
1734                         type = MLD2_ALLOW_NEW_SOURCES;
1735                         dtype = MLD2_BLOCK_OLD_SOURCES;
1736                 }
1737                 skb = add_grec(skb, pmc, type, 0, 0);
1738                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1739
1740                 /* filter mode changes */
1741                 if (pmc->mca_crcount) {
1742                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1743                                 type = MLD2_CHANGE_TO_EXCLUDE;
1744                         else
1745                                 type = MLD2_CHANGE_TO_INCLUDE;
1746                         skb = add_grec(skb, pmc, type, 0, 0);
1747                         pmc->mca_crcount--;
1748                 }
1749                 spin_unlock_bh(&pmc->mca_lock);
1750         }
1751         read_unlock_bh(&idev->lock);
1752         if (!skb)
1753                 return;
1754         (void) mld_sendpack(skb);
1755 }
1756
1757 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1758 {
1759         struct net *net = dev_net(dev);
1760         struct sock *sk = net->ipv6.igmp_sk;
1761         struct inet6_dev *idev;
1762         struct sk_buff *skb;
1763         struct icmp6hdr *hdr;
1764         const struct in6_addr *snd_addr, *saddr;
1765         struct in6_addr *addrp;
1766         struct in6_addr addr_buf;
1767         int err, len, payload_len, full_len;
1768         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1769                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1770                      IPV6_TLV_PADN, 0 };
1771         struct flowi fl;
1772
1773         rcu_read_lock();
1774         IP6_INC_STATS(__in6_dev_get(dev),
1775                       IPSTATS_MIB_OUTREQUESTS);
1776         rcu_read_unlock();
1777         if (type == ICMPV6_MGM_REDUCTION)
1778                 snd_addr = &in6addr_linklocal_allrouters;
1779         else
1780                 snd_addr = addr;
1781
1782         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1783         payload_len = len + sizeof(ra);
1784         full_len = sizeof(struct ipv6hdr) + payload_len;
1785
1786         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1787
1788         if (skb == NULL) {
1789                 rcu_read_lock();
1790                 IP6_INC_STATS(__in6_dev_get(dev),
1791                               IPSTATS_MIB_OUTDISCARDS);
1792                 rcu_read_unlock();
1793                 return;
1794         }
1795
1796         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1797
1798         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1799                 /* <draft-ietf-magma-mld-source-05.txt>:
1800                  * use unspecified address as the source address
1801                  * when a valid link-local address is not available.
1802                  */
1803                 saddr = &in6addr_any;
1804         } else
1805                 saddr = &addr_buf;
1806
1807         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1808
1809         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1810
1811         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1812         memset(hdr, 0, sizeof(struct icmp6hdr));
1813         hdr->icmp6_type = type;
1814
1815         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1816         ipv6_addr_copy(addrp, addr);
1817
1818         hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1819                                            IPPROTO_ICMPV6,
1820                                            csum_partial((__u8 *) hdr, len, 0));
1821
1822         idev = in6_dev_get(skb->dev);
1823
1824         skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1825         if (!skb->dst) {
1826                 err = -ENOMEM;
1827                 goto err_out;
1828         }
1829
1830         icmpv6_flow_init(sk, &fl, type,
1831                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1832                          skb->dev->ifindex);
1833
1834         err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1835         if (err)
1836                 goto err_out;
1837
1838         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1839                       dst_output);
1840 out:
1841         if (!err) {
1842                 ICMP6MSGOUT_INC_STATS(idev, type);
1843                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1844                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1845         } else
1846                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1847
1848         if (likely(idev != NULL))
1849                 in6_dev_put(idev);
1850         return;
1851
1852 err_out:
1853         kfree_skb(skb);
1854         goto out;
1855 }
1856
1857 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1858         struct in6_addr *psfsrc)
1859 {
1860         struct ip6_sf_list *psf, *psf_prev;
1861         int rv = 0;
1862
1863         psf_prev = NULL;
1864         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1865                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1866                         break;
1867                 psf_prev = psf;
1868         }
1869         if (!psf || psf->sf_count[sfmode] == 0) {
1870                 /* source filter not found, or count wrong =>  bug */
1871                 return -ESRCH;
1872         }
1873         psf->sf_count[sfmode]--;
1874         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1875                 struct inet6_dev *idev = pmc->idev;
1876
1877                 /* no more filters for this source */
1878                 if (psf_prev)
1879                         psf_prev->sf_next = psf->sf_next;
1880                 else
1881                         pmc->mca_sources = psf->sf_next;
1882                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1883                     !MLD_V1_SEEN(idev)) {
1884                         psf->sf_crcount = idev->mc_qrv;
1885                         psf->sf_next = pmc->mca_tomb;
1886                         pmc->mca_tomb = psf;
1887                         rv = 1;
1888                 } else
1889                         kfree(psf);
1890         }
1891         return rv;
1892 }
1893
1894 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1895                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1896                           int delta)
1897 {
1898         struct ifmcaddr6 *pmc;
1899         int     changerec = 0;
1900         int     i, err;
1901
1902         if (!idev)
1903                 return -ENODEV;
1904         read_lock_bh(&idev->lock);
1905         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1906                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1907                         break;
1908         }
1909         if (!pmc) {
1910                 /* MCA not found?? bug */
1911                 read_unlock_bh(&idev->lock);
1912                 return -ESRCH;
1913         }
1914         spin_lock_bh(&pmc->mca_lock);
1915         sf_markstate(pmc);
1916         if (!delta) {
1917                 if (!pmc->mca_sfcount[sfmode]) {
1918                         spin_unlock_bh(&pmc->mca_lock);
1919                         read_unlock_bh(&idev->lock);
1920                         return -EINVAL;
1921                 }
1922                 pmc->mca_sfcount[sfmode]--;
1923         }
1924         err = 0;
1925         for (i=0; i<sfcount; i++) {
1926                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1927
1928                 changerec |= rv > 0;
1929                 if (!err && rv < 0)
1930                         err = rv;
1931         }
1932         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1933             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1934             pmc->mca_sfcount[MCAST_INCLUDE]) {
1935                 struct ip6_sf_list *psf;
1936
1937                 /* filter mode change */
1938                 pmc->mca_sfmode = MCAST_INCLUDE;
1939                 pmc->mca_crcount = idev->mc_qrv;
1940                 idev->mc_ifc_count = pmc->mca_crcount;
1941                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1942                         psf->sf_crcount = 0;
1943                 mld_ifc_event(pmc->idev);
1944         } else if (sf_setstate(pmc) || changerec)
1945                 mld_ifc_event(pmc->idev);
1946         spin_unlock_bh(&pmc->mca_lock);
1947         read_unlock_bh(&idev->lock);
1948         return err;
1949 }
1950
1951 /*
1952  * Add multicast single-source filter to the interface list
1953  */
1954 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1955         struct in6_addr *psfsrc, int delta)
1956 {
1957         struct ip6_sf_list *psf, *psf_prev;
1958
1959         psf_prev = NULL;
1960         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1961                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1962                         break;
1963                 psf_prev = psf;
1964         }
1965         if (!psf) {
1966                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1967                 if (!psf)
1968                         return -ENOBUFS;
1969
1970                 psf->sf_addr = *psfsrc;
1971                 if (psf_prev) {
1972                         psf_prev->sf_next = psf;
1973                 } else
1974                         pmc->mca_sources = psf;
1975         }
1976         psf->sf_count[sfmode]++;
1977         return 0;
1978 }
1979
1980 static void sf_markstate(struct ifmcaddr6 *pmc)
1981 {
1982         struct ip6_sf_list *psf;
1983         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1984
1985         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1986                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1987                         psf->sf_oldin = mca_xcount ==
1988                                 psf->sf_count[MCAST_EXCLUDE] &&
1989                                 !psf->sf_count[MCAST_INCLUDE];
1990                 } else
1991                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1992 }
1993
1994 static int sf_setstate(struct ifmcaddr6 *pmc)
1995 {
1996         struct ip6_sf_list *psf, *dpsf;
1997         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1998         int qrv = pmc->idev->mc_qrv;
1999         int new_in, rv;
2000
2001         rv = 0;
2002         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2003                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2004                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2005                                 !psf->sf_count[MCAST_INCLUDE];
2006                 } else
2007                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2008                 if (new_in) {
2009                         if (!psf->sf_oldin) {
2010                                 struct ip6_sf_list *prev = NULL;
2011
2012                                 for (dpsf=pmc->mca_tomb; dpsf;
2013                                      dpsf=dpsf->sf_next) {
2014                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2015                                             &psf->sf_addr))
2016                                                 break;
2017                                         prev = dpsf;
2018                                 }
2019                                 if (dpsf) {
2020                                         if (prev)
2021                                                 prev->sf_next = dpsf->sf_next;
2022                                         else
2023                                                 pmc->mca_tomb = dpsf->sf_next;
2024                                         kfree(dpsf);
2025                                 }
2026                                 psf->sf_crcount = qrv;
2027                                 rv++;
2028                         }
2029                 } else if (psf->sf_oldin) {
2030                         psf->sf_crcount = 0;
2031                         /*
2032                          * add or update "delete" records if an active filter
2033                          * is now inactive
2034                          */
2035                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2036                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2037                                     &psf->sf_addr))
2038                                         break;
2039                         if (!dpsf) {
2040                                 dpsf = (struct ip6_sf_list *)
2041                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2042                                 if (!dpsf)
2043                                         continue;
2044                                 *dpsf = *psf;
2045                                 /* pmc->mca_lock held by callers */
2046                                 dpsf->sf_next = pmc->mca_tomb;
2047                                 pmc->mca_tomb = dpsf;
2048                         }
2049                         dpsf->sf_crcount = qrv;
2050                         rv++;
2051                 }
2052         }
2053         return rv;
2054 }
2055
2056 /*
2057  * Add multicast source filter list to the interface list
2058  */
2059 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2060                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2061                           int delta)
2062 {
2063         struct ifmcaddr6 *pmc;
2064         int     isexclude;
2065         int     i, err;
2066
2067         if (!idev)
2068                 return -ENODEV;
2069         read_lock_bh(&idev->lock);
2070         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2071                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2072                         break;
2073         }
2074         if (!pmc) {
2075                 /* MCA not found?? bug */
2076                 read_unlock_bh(&idev->lock);
2077                 return -ESRCH;
2078         }
2079         spin_lock_bh(&pmc->mca_lock);
2080
2081         sf_markstate(pmc);
2082         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2083         if (!delta)
2084                 pmc->mca_sfcount[sfmode]++;
2085         err = 0;
2086         for (i=0; i<sfcount; i++) {
2087                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2088                 if (err)
2089                         break;
2090         }
2091         if (err) {
2092                 int j;
2093
2094                 if (!delta)
2095                         pmc->mca_sfcount[sfmode]--;
2096                 for (j=0; j<i; j++)
2097                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2098         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2099                 struct inet6_dev *idev = pmc->idev;
2100                 struct ip6_sf_list *psf;
2101
2102                 /* filter mode change */
2103                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2104                         pmc->mca_sfmode = MCAST_EXCLUDE;
2105                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2106                         pmc->mca_sfmode = MCAST_INCLUDE;
2107                 /* else no filters; keep old mode for reports */
2108
2109                 pmc->mca_crcount = idev->mc_qrv;
2110                 idev->mc_ifc_count = pmc->mca_crcount;
2111                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2112                         psf->sf_crcount = 0;
2113                 mld_ifc_event(idev);
2114         } else if (sf_setstate(pmc))
2115                 mld_ifc_event(idev);
2116         spin_unlock_bh(&pmc->mca_lock);
2117         read_unlock_bh(&idev->lock);
2118         return err;
2119 }
2120
2121 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2122 {
2123         struct ip6_sf_list *psf, *nextpsf;
2124
2125         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2126                 nextpsf = psf->sf_next;
2127                 kfree(psf);
2128         }
2129         pmc->mca_tomb = NULL;
2130         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2131                 nextpsf = psf->sf_next;
2132                 kfree(psf);
2133         }
2134         pmc->mca_sources = NULL;
2135         pmc->mca_sfmode = MCAST_EXCLUDE;
2136         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2137         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2138 }
2139
2140
2141 static void igmp6_join_group(struct ifmcaddr6 *ma)
2142 {
2143         unsigned long delay;
2144
2145         if (ma->mca_flags & MAF_NOREPORT)
2146                 return;
2147
2148         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2149
2150         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2151
2152         spin_lock_bh(&ma->mca_lock);
2153         if (del_timer(&ma->mca_timer)) {
2154                 atomic_dec(&ma->mca_refcnt);
2155                 delay = ma->mca_timer.expires - jiffies;
2156         }
2157
2158         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2159                 atomic_inc(&ma->mca_refcnt);
2160         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2161         spin_unlock_bh(&ma->mca_lock);
2162 }
2163
2164 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2165                             struct inet6_dev *idev)
2166 {
2167         int err;
2168
2169         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2170          * so no other readers or writers of iml or its sflist
2171          */
2172         if (!iml->sflist) {
2173                 /* any-source empty exclude case */
2174                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2175         }
2176         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2177                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2178         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2179         iml->sflist = NULL;
2180         return err;
2181 }
2182
2183 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2184 {
2185         if (MLD_V1_SEEN(ma->idev)) {
2186                 if (ma->mca_flags & MAF_LAST_REPORTER)
2187                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2188                                 ICMPV6_MGM_REDUCTION);
2189         } else {
2190                 mld_add_delrec(ma->idev, ma);
2191                 mld_ifc_event(ma->idev);
2192         }
2193 }
2194
2195 static void mld_gq_timer_expire(unsigned long data)
2196 {
2197         struct inet6_dev *idev = (struct inet6_dev *)data;
2198
2199         idev->mc_gq_running = 0;
2200         mld_send_report(idev, NULL);
2201         __in6_dev_put(idev);
2202 }
2203
2204 static void mld_ifc_timer_expire(unsigned long data)
2205 {
2206         struct inet6_dev *idev = (struct inet6_dev *)data;
2207
2208         mld_send_cr(idev);
2209         if (idev->mc_ifc_count) {
2210                 idev->mc_ifc_count--;
2211                 if (idev->mc_ifc_count)
2212                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2213         }
2214         __in6_dev_put(idev);
2215 }
2216
2217 static void mld_ifc_event(struct inet6_dev *idev)
2218 {
2219         if (MLD_V1_SEEN(idev))
2220                 return;
2221         idev->mc_ifc_count = idev->mc_qrv;
2222         mld_ifc_start_timer(idev, 1);
2223 }
2224
2225
2226 static void igmp6_timer_handler(unsigned long data)
2227 {
2228         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2229
2230         if (MLD_V1_SEEN(ma->idev))
2231                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2232         else
2233                 mld_send_report(ma->idev, ma);
2234
2235         spin_lock(&ma->mca_lock);
2236         ma->mca_flags |=  MAF_LAST_REPORTER;
2237         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2238         spin_unlock(&ma->mca_lock);
2239         ma_put(ma);
2240 }
2241
2242 /* Device going down */
2243
2244 void ipv6_mc_down(struct inet6_dev *idev)
2245 {
2246         struct ifmcaddr6 *i;
2247
2248         /* Withdraw multicast list */
2249
2250         read_lock_bh(&idev->lock);
2251         idev->mc_ifc_count = 0;
2252         if (del_timer(&idev->mc_ifc_timer))
2253                 __in6_dev_put(idev);
2254         idev->mc_gq_running = 0;
2255         if (del_timer(&idev->mc_gq_timer))
2256                 __in6_dev_put(idev);
2257
2258         for (i = idev->mc_list; i; i=i->next)
2259                 igmp6_group_dropped(i);
2260         read_unlock_bh(&idev->lock);
2261
2262         mld_clear_delrec(idev);
2263 }
2264
2265
2266 /* Device going up */
2267
2268 void ipv6_mc_up(struct inet6_dev *idev)
2269 {
2270         struct ifmcaddr6 *i;
2271
2272         /* Install multicast list, except for all-nodes (already installed) */
2273
2274         read_lock_bh(&idev->lock);
2275         for (i = idev->mc_list; i; i=i->next)
2276                 igmp6_group_added(i);
2277         read_unlock_bh(&idev->lock);
2278 }
2279
2280 /* IPv6 device initialization. */
2281
2282 void ipv6_mc_init_dev(struct inet6_dev *idev)
2283 {
2284         write_lock_bh(&idev->lock);
2285         rwlock_init(&idev->mc_lock);
2286         idev->mc_gq_running = 0;
2287         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2288                         (unsigned long)idev);
2289         idev->mc_tomb = NULL;
2290         idev->mc_ifc_count = 0;
2291         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2292                         (unsigned long)idev);
2293         idev->mc_qrv = MLD_QRV_DEFAULT;
2294         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2295         idev->mc_v1_seen = 0;
2296         write_unlock_bh(&idev->lock);
2297 }
2298
2299 /*
2300  *      Device is about to be destroyed: clean up.
2301  */
2302
2303 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2304 {
2305         struct ifmcaddr6 *i;
2306
2307         /* Deactivate timers */
2308         ipv6_mc_down(idev);
2309
2310         /* Delete all-nodes address. */
2311         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2312          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2313          * fail.
2314          */
2315         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2316
2317         if (idev->cnf.forwarding)
2318                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2319
2320         write_lock_bh(&idev->lock);
2321         while ((i = idev->mc_list) != NULL) {
2322                 idev->mc_list = i->next;
2323                 write_unlock_bh(&idev->lock);
2324
2325                 igmp6_group_dropped(i);
2326                 ma_put(i);
2327
2328                 write_lock_bh(&idev->lock);
2329         }
2330         write_unlock_bh(&idev->lock);
2331 }
2332
2333 #ifdef CONFIG_PROC_FS
2334 struct igmp6_mc_iter_state {
2335         struct seq_net_private p;
2336         struct net_device *dev;
2337         struct inet6_dev *idev;
2338 };
2339
2340 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2341
2342 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2343 {
2344         struct ifmcaddr6 *im = NULL;
2345         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2346         struct net *net = seq_file_net(seq);
2347
2348         state->idev = NULL;
2349         for_each_netdev(net, state->dev) {
2350                 struct inet6_dev *idev;
2351                 idev = in6_dev_get(state->dev);
2352                 if (!idev)
2353                         continue;
2354                 read_lock_bh(&idev->lock);
2355                 im = idev->mc_list;
2356                 if (im) {
2357                         state->idev = idev;
2358                         break;
2359                 }
2360                 read_unlock_bh(&idev->lock);
2361                 in6_dev_put(idev);
2362         }
2363         return im;
2364 }
2365
2366 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2367 {
2368         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2369
2370         im = im->next;
2371         while (!im) {
2372                 if (likely(state->idev != NULL)) {
2373                         read_unlock_bh(&state->idev->lock);
2374                         in6_dev_put(state->idev);
2375                 }
2376                 state->dev = next_net_device(state->dev);
2377                 if (!state->dev) {
2378                         state->idev = NULL;
2379                         break;
2380                 }
2381                 state->idev = in6_dev_get(state->dev);
2382                 if (!state->idev)
2383                         continue;
2384                 read_lock_bh(&state->idev->lock);
2385                 im = state->idev->mc_list;
2386         }
2387         return im;
2388 }
2389
2390 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2391 {
2392         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2393         if (im)
2394                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2395                         --pos;
2396         return pos ? NULL : im;
2397 }
2398
2399 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2400         __acquires(dev_base_lock)
2401 {
2402         read_lock(&dev_base_lock);
2403         return igmp6_mc_get_idx(seq, *pos);
2404 }
2405
2406 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2407 {
2408         struct ifmcaddr6 *im;
2409         im = igmp6_mc_get_next(seq, v);
2410         ++*pos;
2411         return im;
2412 }
2413
2414 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2415         __releases(dev_base_lock)
2416 {
2417         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2418         if (likely(state->idev != NULL)) {
2419                 read_unlock_bh(&state->idev->lock);
2420                 in6_dev_put(state->idev);
2421                 state->idev = NULL;
2422         }
2423         state->dev = NULL;
2424         read_unlock(&dev_base_lock);
2425 }
2426
2427 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2428 {
2429         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2430         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2431
2432         seq_printf(seq,
2433                    "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2434                    state->dev->ifindex, state->dev->name,
2435                    NIP6(im->mca_addr),
2436                    im->mca_users, im->mca_flags,
2437                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2438                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2439         return 0;
2440 }
2441
2442 static const struct seq_operations igmp6_mc_seq_ops = {
2443         .start  =       igmp6_mc_seq_start,
2444         .next   =       igmp6_mc_seq_next,
2445         .stop   =       igmp6_mc_seq_stop,
2446         .show   =       igmp6_mc_seq_show,
2447 };
2448
2449 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2450 {
2451         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2452                             sizeof(struct igmp6_mc_iter_state));
2453 }
2454
2455 static const struct file_operations igmp6_mc_seq_fops = {
2456         .owner          =       THIS_MODULE,
2457         .open           =       igmp6_mc_seq_open,
2458         .read           =       seq_read,
2459         .llseek         =       seq_lseek,
2460         .release        =       seq_release_net,
2461 };
2462
2463 struct igmp6_mcf_iter_state {
2464         struct seq_net_private p;
2465         struct net_device *dev;
2466         struct inet6_dev *idev;
2467         struct ifmcaddr6 *im;
2468 };
2469
2470 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2471
2472 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2473 {
2474         struct ip6_sf_list *psf = NULL;
2475         struct ifmcaddr6 *im = NULL;
2476         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2477         struct net *net = seq_file_net(seq);
2478
2479         state->idev = NULL;
2480         state->im = NULL;
2481         for_each_netdev(net, state->dev) {
2482                 struct inet6_dev *idev;
2483                 idev = in6_dev_get(state->dev);
2484                 if (unlikely(idev == NULL))
2485                         continue;
2486                 read_lock_bh(&idev->lock);
2487                 im = idev->mc_list;
2488                 if (likely(im != NULL)) {
2489                         spin_lock_bh(&im->mca_lock);
2490                         psf = im->mca_sources;
2491                         if (likely(psf != NULL)) {
2492                                 state->im = im;
2493                                 state->idev = idev;
2494                                 break;
2495                         }
2496                         spin_unlock_bh(&im->mca_lock);
2497                 }
2498                 read_unlock_bh(&idev->lock);
2499                 in6_dev_put(idev);
2500         }
2501         return psf;
2502 }
2503
2504 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2505 {
2506         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2507
2508         psf = psf->sf_next;
2509         while (!psf) {
2510                 spin_unlock_bh(&state->im->mca_lock);
2511                 state->im = state->im->next;
2512                 while (!state->im) {
2513                         if (likely(state->idev != NULL)) {
2514                                 read_unlock_bh(&state->idev->lock);
2515                                 in6_dev_put(state->idev);
2516                         }
2517                         state->dev = next_net_device(state->dev);
2518                         if (!state->dev) {
2519                                 state->idev = NULL;
2520                                 goto out;
2521                         }
2522                         state->idev = in6_dev_get(state->dev);
2523                         if (!state->idev)
2524                                 continue;
2525                         read_lock_bh(&state->idev->lock);
2526                         state->im = state->idev->mc_list;
2527                 }
2528                 if (!state->im)
2529                         break;
2530                 spin_lock_bh(&state->im->mca_lock);
2531                 psf = state->im->mca_sources;
2532         }
2533 out:
2534         return psf;
2535 }
2536
2537 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2538 {
2539         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2540         if (psf)
2541                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2542                         --pos;
2543         return pos ? NULL : psf;
2544 }
2545
2546 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2547         __acquires(dev_base_lock)
2548 {
2549         read_lock(&dev_base_lock);
2550         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2551 }
2552
2553 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2554 {
2555         struct ip6_sf_list *psf;
2556         if (v == SEQ_START_TOKEN)
2557                 psf = igmp6_mcf_get_first(seq);
2558         else
2559                 psf = igmp6_mcf_get_next(seq, v);
2560         ++*pos;
2561         return psf;
2562 }
2563
2564 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2565         __releases(dev_base_lock)
2566 {
2567         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2568         if (likely(state->im != NULL)) {
2569                 spin_unlock_bh(&state->im->mca_lock);
2570                 state->im = NULL;
2571         }
2572         if (likely(state->idev != NULL)) {
2573                 read_unlock_bh(&state->idev->lock);
2574                 in6_dev_put(state->idev);
2575                 state->idev = NULL;
2576         }
2577         state->dev = NULL;
2578         read_unlock(&dev_base_lock);
2579 }
2580
2581 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2582 {
2583         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2584         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2585
2586         if (v == SEQ_START_TOKEN) {
2587                 seq_printf(seq,
2588                            "%3s %6s "
2589                            "%32s %32s %6s %6s\n", "Idx",
2590                            "Device", "Multicast Address",
2591                            "Source Address", "INC", "EXC");
2592         } else {
2593                 seq_printf(seq,
2594                            "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2595                            state->dev->ifindex, state->dev->name,
2596                            NIP6(state->im->mca_addr),
2597                            NIP6(psf->sf_addr),
2598                            psf->sf_count[MCAST_INCLUDE],
2599                            psf->sf_count[MCAST_EXCLUDE]);
2600         }
2601         return 0;
2602 }
2603
2604 static const struct seq_operations igmp6_mcf_seq_ops = {
2605         .start  =       igmp6_mcf_seq_start,
2606         .next   =       igmp6_mcf_seq_next,
2607         .stop   =       igmp6_mcf_seq_stop,
2608         .show   =       igmp6_mcf_seq_show,
2609 };
2610
2611 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2612 {
2613         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2614                             sizeof(struct igmp6_mcf_iter_state));
2615 }
2616
2617 static const struct file_operations igmp6_mcf_seq_fops = {
2618         .owner          =       THIS_MODULE,
2619         .open           =       igmp6_mcf_seq_open,
2620         .read           =       seq_read,
2621         .llseek         =       seq_lseek,
2622         .release        =       seq_release_net,
2623 };
2624
2625 static int igmp6_proc_init(struct net *net)
2626 {
2627         int err;
2628
2629         err = -ENOMEM;
2630         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2631                 goto out;
2632         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2633                                   &igmp6_mcf_seq_fops))
2634                 goto out_proc_net_igmp6;
2635
2636         err = 0;
2637 out:
2638         return err;
2639
2640 out_proc_net_igmp6:
2641         proc_net_remove(net, "igmp6");
2642         goto out;
2643 }
2644
2645 static void igmp6_proc_exit(struct net *net)
2646 {
2647         proc_net_remove(net, "mcfilter6");
2648         proc_net_remove(net, "igmp6");
2649 }
2650 #else
2651 static int igmp6_proc_init(struct net *net)
2652 {
2653         return 0;
2654 }
2655 static void igmp6_proc_exit(struct net *net)
2656 {
2657         ;
2658 }
2659 #endif
2660
2661 static int igmp6_net_init(struct net *net)
2662 {
2663         int err;
2664
2665         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2666                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2667         if (err < 0) {
2668                 printk(KERN_ERR
2669                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2670                        err);
2671                 goto out;
2672         }
2673
2674         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2675
2676         err = igmp6_proc_init(net);
2677         if (err)
2678                 goto out_sock_create;
2679 out:
2680         return err;
2681
2682 out_sock_create:
2683         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2684         goto out;
2685 }
2686
2687 static void igmp6_net_exit(struct net *net)
2688 {
2689         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2690         igmp6_proc_exit(net);
2691 }
2692
2693 static struct pernet_operations igmp6_net_ops = {
2694         .init = igmp6_net_init,
2695         .exit = igmp6_net_exit,
2696 };
2697
2698 int __init igmp6_init(void)
2699 {
2700         return register_pernet_subsys(&igmp6_net_ops);
2701 }
2702
2703 void igmp6_cleanup(void)
2704 {
2705         unregister_pernet_subsys(&igmp6_net_ops);
2706 }