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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  *      $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
   9  *
  10  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  */
  17
  18 /* Changes:
  19  *
  20  *      yoshfuji        : fix format of router-alert option
  21  *      YOSHIFUJI Hideaki @USAGI:
  22  *              Fixed source address for MLD message based on
  23  *              <draft-ietf-magma-mld-source-05.txt>.
  24  *      YOSHIFUJI Hideaki @USAGI:
  25  *              - Ignore Queries for invalid addresses.
  26  *              - MLD for link-local addresses.
  27  *      David L Stevens <dlstevens@us.ibm.com>:
  28  *              - MLDv2 support
  29  */
  30
  31 #include <linux/module.h>
  32 #include <linux/errno.h>
  33 #include <linux/types.h>
  34 #include <linux/string.h>
  35 #include <linux/socket.h>
  36 #include <linux/sockios.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/times.h>
  39 #include <linux/net.h>
  40 #include <linux/in.h>
  41 #include <linux/in6.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/if_arp.h>
  44 #include <linux/route.h>
  45 #include <linux/init.h>
  46 #include <linux/proc_fs.h>
  47 #include <linux/seq_file.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/net_namespace.h>
  53 #include <net/sock.h>
  54 #include <net/snmp.h>
  55
  56 #include <net/ipv6.h>
  57 #include <net/protocol.h>
  58 #include <net/if_inet6.h>
  59 #include <net/ndisc.h>
  60 #include <net/addrconf.h>
  61 #include <net/ip6_route.h>
  62 #include <net/inet_common.h>
  63
  64 #include <net/ip6_checksum.h>
  65
  66 /* Set to 3 to get tracing... */
  67 #define MCAST_DEBUG 2
  68
  69 #if MCAST_DEBUG >= 3
  70 #define MDBG(x) printk x
  71 #else
  72 #define MDBG(x)
  73 #endif
  74
  75 /*
  76  *  These header formats should be in a separate include file, but icmpv6.h
  77  *  doesn't have in6_addr defined in all cases, there is no __u128, and no
  78  *  other files reference these.
  79  *
  80  *                      +-DLS 4/14/03
  81  */
  82
  83 /* Multicast Listener Discovery version 2 headers */
  84
  85 struct mld2_grec {
  86         __u8            grec_type;
  87         __u8            grec_auxwords;
  88         __be16          grec_nsrcs;
  89         struct in6_addr grec_mca;
  90         struct in6_addr grec_src[0];
  91 };
  92
  93 struct mld2_report {
  94         __u8    type;
  95         __u8    resv1;
  96         __sum16 csum;
  97         __be16  resv2;
  98         __be16  ngrec;
  99         struct mld2_grec grec[0];
 100 };
 101
 102 struct mld2_query {
 103         __u8 type;
 104         __u8 code;
 105         __sum16 csum;
 106         __be16 mrc;
 107         __be16 resv1;
 108         struct in6_addr mca;
 109 #if defined(__LITTLE_ENDIAN_BITFIELD)
 110         __u8 qrv:3,
 111              suppress:1,
 112              resv2:4;
 113 #elif defined(__BIG_ENDIAN_BITFIELD)
 114         __u8 resv2:4,
 115              suppress:1,
 116              qrv:3;
 117 #else
 118 #error "Please fix <asm/byteorder.h>"
 119 #endif
 120         __u8 qqic;
 121         __be16 nsrcs;
 122         struct in6_addr srcs[0];
 123 };
 124
 125 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 126
 127 /* Big mc list lock for all the sockets */
 128 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
 129
 130 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
 131
 132 static void igmp6_join_group(struct ifmcaddr6 *ma);
 133 static void igmp6_leave_group(struct ifmcaddr6 *ma);
 134 static void igmp6_timer_handler(unsigned long data);
 135
 136 static void mld_gq_timer_expire(unsigned long data);
 137 static void mld_ifc_timer_expire(unsigned long data);
 138 static void mld_ifc_event(struct inet6_dev *idev);
 139 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 140 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
 141 static void mld_clear_delrec(struct inet6_dev *idev);
 142 static int sf_setstate(struct ifmcaddr6 *pmc);
 143 static void sf_markstate(struct ifmcaddr6 *pmc);
 144 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 145 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 146                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 147                           int delta);
 148 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 149                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 150                           int delta);
 151 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 152                             struct inet6_dev *idev);
 153
 154
 155 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 156 #define MLD_QRV_DEFAULT         2
 157
 158 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
 159                 (idev)->cnf.force_mld_version == 1 || \
 160                 ((idev)->mc_v1_seen && \
 161                 time_before(jiffies, (idev)->mc_v1_seen)))
 162
 163 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 164 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
 165         ((value) < (thresh) ? (value) : \
 166         ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
 167         (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 168
 169 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
 170 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
 171
 172 #define IPV6_MLD_MAX_MSF        64
 173
 174 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 175
 176 /*
 177  *      socket join on multicast group
 178  */
 179
 180 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
 181 {
 182         struct net_device *dev = NULL;
 183         struct ipv6_mc_socklist *mc_lst;
 184         struct ipv6_pinfo *np = inet6_sk(sk);
 185         struct net *net = sock_net(sk);
 186         int err;
 187
 188         if (!ipv6_addr_is_multicast(addr))
 189                 return -EINVAL;
 190
 191         read_lock_bh(&ipv6_sk_mc_lock);
 192         for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
 193                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 194                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 195                         read_unlock_bh(&ipv6_sk_mc_lock);
 196                         return -EADDRINUSE;
 197                 }
 198         }
 199         read_unlock_bh(&ipv6_sk_mc_lock);
 200
 201         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 202
 203         if (mc_lst == NULL)
 204                 return -ENOMEM;
 205
 206         mc_lst->next = NULL;
 207         ipv6_addr_copy(&mc_lst->addr, addr);
 208
 209         if (ifindex == 0) {
 210                 struct rt6_info *rt;
 211                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 212                 if (rt) {
 213                         dev = rt->rt6i_dev;
 214                         dev_hold(dev);
 215                         dst_release(&rt->u.dst);
 216                 }
 217         } else
 218                 dev = dev_get_by_index(net, ifindex);
 219
 220         if (dev == NULL) {
 221                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 222                 return -ENODEV;
 223         }
 224
 225         mc_lst->ifindex = dev->ifindex;
 226         mc_lst->sfmode = MCAST_EXCLUDE;
 227         rwlock_init(&mc_lst->sflock);
 228         mc_lst->sflist = NULL;
 229
 230         /*
 231          *      now add/increase the group membership on the device
 232          */
 233
 234         err = ipv6_dev_mc_inc(dev, addr);
 235
 236         if (err) {
 237                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 238                 dev_put(dev);
 239                 return err;
 240         }
 241
 242         write_lock_bh(&ipv6_sk_mc_lock);
 243         mc_lst->next = np->ipv6_mc_list;
 244         np->ipv6_mc_list = mc_lst;
 245         write_unlock_bh(&ipv6_sk_mc_lock);
 246
 247         dev_put(dev);
 248
 249         return 0;
 250 }
 251
 252 /*
 253  *      socket leave on multicast group
 254  */
 255 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 256 {
 257         struct ipv6_pinfo *np = inet6_sk(sk);
 258         struct ipv6_mc_socklist *mc_lst, **lnk;
 259         struct net *net = sock_net(sk);
 260
 261         write_lock_bh(&ipv6_sk_mc_lock);
 262         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 263                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 264                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 265                         struct net_device *dev;
 266
 267                         *lnk = mc_lst->next;
 268                         write_unlock_bh(&ipv6_sk_mc_lock);
 269
 270                         dev = dev_get_by_index(net, mc_lst->ifindex);
 271                         if (dev != NULL) {
 272                                 struct inet6_dev *idev = in6_dev_get(dev);
 273
 274                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 275                                 if (idev) {
 276                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 277                                         in6_dev_put(idev);
 278                                 }
 279                                 dev_put(dev);
 280                         } else
 281                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 282                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 283                         return 0;
 284                 }
 285         }
 286         write_unlock_bh(&ipv6_sk_mc_lock);
 287
 288         return -EADDRNOTAVAIL;
 289 }
 290
 291 static struct inet6_dev *ip6_mc_find_dev(struct net *net,
 292                                          struct in6_addr *group,
 293                                          int ifindex)
 294 {
 295         struct net_device *dev = NULL;
 296         struct inet6_dev *idev = NULL;
 297
 298         if (ifindex == 0) {
 299                 struct rt6_info *rt;
 300
 301                 rt = rt6_lookup(net, group, NULL, 0, 0);
 302                 if (rt) {
 303                         dev = rt->rt6i_dev;
 304                         dev_hold(dev);
 305                         dst_release(&rt->u.dst);
 306                 }
 307         } else
 308                 dev = dev_get_by_index(net, ifindex);
 309
 310         if (!dev)
 311                 return NULL;
 312         idev = in6_dev_get(dev);
 313         if (!idev) {
 314                 dev_put(dev);
 315                 return NULL;
 316         }
 317         read_lock_bh(&idev->lock);
 318         if (idev->dead) {
 319                 read_unlock_bh(&idev->lock);
 320                 in6_dev_put(idev);
 321                 dev_put(dev);
 322                 return NULL;
 323         }
 324         return idev;
 325 }
 326
 327 void ipv6_sock_mc_close(struct sock *sk)
 328 {
 329         struct ipv6_pinfo *np = inet6_sk(sk);
 330         struct ipv6_mc_socklist *mc_lst;
 331         struct net *net = sock_net(sk);
 332
 333         write_lock_bh(&ipv6_sk_mc_lock);
 334         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 335                 struct net_device *dev;
 336
 337                 np->ipv6_mc_list = mc_lst->next;
 338                 write_unlock_bh(&ipv6_sk_mc_lock);
 339
 340                 dev = dev_get_by_index(net, mc_lst->ifindex);
 341                 if (dev) {
 342                         struct inet6_dev *idev = in6_dev_get(dev);
 343
 344                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 345                         if (idev) {
 346                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 347                                 in6_dev_put(idev);
 348                         }
 349                         dev_put(dev);
 350                 } else
 351                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 352
 353                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 354
 355                 write_lock_bh(&ipv6_sk_mc_lock);
 356         }
 357         write_unlock_bh(&ipv6_sk_mc_lock);
 358 }
 359
 360 int ip6_mc_source(int add, int omode, struct sock *sk,
 361         struct group_source_req *pgsr)
 362 {
 363         struct in6_addr *source, *group;
 364         struct ipv6_mc_socklist *pmc;
 365         struct net_device *dev;
 366         struct inet6_dev *idev;
 367         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 368         struct ip6_sf_socklist *psl;
 369         struct net *net = sock_net(sk);
 370         int i, j, rv;
 371         int leavegroup = 0;
 372         int pmclocked = 0;
 373         int err;
 374
 375         if (pgsr->gsr_group.ss_family != AF_INET6 ||
 376             pgsr->gsr_source.ss_family != AF_INET6)
 377                 return -EINVAL;
 378
 379         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 380         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 381
 382         if (!ipv6_addr_is_multicast(group))
 383                 return -EINVAL;
 384
 385         idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
 386         if (!idev)
 387                 return -ENODEV;
 388         dev = idev->dev;
 389
 390         err = -EADDRNOTAVAIL;
 391
 392         read_lock_bh(&ipv6_sk_mc_lock);
 393         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 394                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 395                         continue;
 396                 if (ipv6_addr_equal(&pmc->addr, group))
 397                         break;
 398         }
 399         if (!pmc) {             /* must have a prior join */
 400                 err = -EINVAL;
 401                 goto done;
 402         }
 403         /* if a source filter was set, must be the same mode as before */
 404         if (pmc->sflist) {
 405                 if (pmc->sfmode != omode) {
 406                         err = -EINVAL;
 407                         goto done;
 408                 }
 409         } else if (pmc->sfmode != omode) {
 410                 /* allow mode switches for empty-set filters */
 411                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 412                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 413                 pmc->sfmode = omode;
 414         }
 415
 416         write_lock_bh(&pmc->sflock);
 417         pmclocked = 1;
 418
 419         psl = pmc->sflist;
 420         if (!add) {
 421                 if (!psl)
 422                         goto done;      /* err = -EADDRNOTAVAIL */
 423                 rv = !0;
 424                 for (i=0; i<psl->sl_count; i++) {
 425                         rv = memcmp(&psl->sl_addr[i], source,
 426                                 sizeof(struct in6_addr));
 427                         if (rv == 0)
 428                                 break;
 429                 }
 430                 if (rv)         /* source not found */
 431                         goto done;      /* err = -EADDRNOTAVAIL */
 432
 433                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 434                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 435                         leavegroup = 1;
 436                         goto done;
 437                 }
 438
 439                 /* update the interface filter */
 440                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 441
 442                 for (j=i+1; j<psl->sl_count; j++)
 443                         psl->sl_addr[j-1] = psl->sl_addr[j];
 444                 psl->sl_count--;
 445                 err = 0;
 446                 goto done;
 447         }
 448         /* else, add a new source to the filter */
 449
 450         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 451                 err = -ENOBUFS;
 452                 goto done;
 453         }
 454         if (!psl || psl->sl_count == psl->sl_max) {
 455                 struct ip6_sf_socklist *newpsl;
 456                 int count = IP6_SFBLOCK;
 457
 458                 if (psl)
 459                         count += psl->sl_max;
 460                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 461                 if (!newpsl) {
 462                         err = -ENOBUFS;
 463                         goto done;
 464                 }
 465                 newpsl->sl_max = count;
 466                 newpsl->sl_count = count - IP6_SFBLOCK;
 467                 if (psl) {
 468                         for (i=0; i<psl->sl_count; i++)
 469                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 470                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 471                 }
 472                 pmc->sflist = psl = newpsl;
 473         }
 474         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 475         for (i=0; i<psl->sl_count; i++) {
 476                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 477                 if (rv == 0)
 478                         break;
 479         }
 480         if (rv == 0)            /* address already there is an error */
 481                 goto done;
 482         for (j=psl->sl_count-1; j>=i; j--)
 483                 psl->sl_addr[j+1] = psl->sl_addr[j];
 484         psl->sl_addr[i] = *source;
 485         psl->sl_count++;
 486         err = 0;
 487         /* update the interface list */
 488         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 489 done:
 490         if (pmclocked)
 491                 write_unlock_bh(&pmc->sflock);
 492         read_unlock_bh(&ipv6_sk_mc_lock);
 493         read_unlock_bh(&idev->lock);
 494         in6_dev_put(idev);
 495         dev_put(dev);
 496         if (leavegroup)
 497                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 498         return err;
 499 }
 500
 501 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 502 {
 503         struct in6_addr *group;
 504         struct ipv6_mc_socklist *pmc;
 505         struct net_device *dev;
 506         struct inet6_dev *idev;
 507         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 508         struct ip6_sf_socklist *newpsl, *psl;
 509         struct net *net = sock_net(sk);
 510         int leavegroup = 0;
 511         int i, err;
 512
 513         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 514
 515         if (!ipv6_addr_is_multicast(group))
 516                 return -EINVAL;
 517         if (gsf->gf_fmode != MCAST_INCLUDE &&
 518             gsf->gf_fmode != MCAST_EXCLUDE)
 519                 return -EINVAL;
 520
 521         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 522
 523         if (!idev)
 524                 return -ENODEV;
 525         dev = idev->dev;
 526
 527         err = 0;
 528         read_lock_bh(&ipv6_sk_mc_lock);
 529
 530         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 531                 leavegroup = 1;
 532                 goto done;
 533         }
 534
 535         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 536                 if (pmc->ifindex != gsf->gf_interface)
 537                         continue;
 538                 if (ipv6_addr_equal(&pmc->addr, group))
 539                         break;
 540         }
 541         if (!pmc) {             /* must have a prior join */
 542                 err = -EINVAL;
 543                 goto done;
 544         }
 545         if (gsf->gf_numsrc) {
 546                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 547                                                           GFP_ATOMIC);
 548                 if (!newpsl) {
 549                         err = -ENOBUFS;
 550                         goto done;
 551                 }
 552                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 553                 for (i=0; i<newpsl->sl_count; ++i) {
 554                         struct sockaddr_in6 *psin6;
 555
 556                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 557                         newpsl->sl_addr[i] = psin6->sin6_addr;
 558                 }
 559                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 560                         newpsl->sl_count, newpsl->sl_addr, 0);
 561                 if (err) {
 562                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 563                         goto done;
 564                 }
 565         } else {
 566                 newpsl = NULL;
 567                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 568         }
 569
 570         write_lock_bh(&pmc->sflock);
 571         psl = pmc->sflist;
 572         if (psl) {
 573                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 574                         psl->sl_count, psl->sl_addr, 0);
 575                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 576         } else
 577                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 578         pmc->sflist = newpsl;
 579         pmc->sfmode = gsf->gf_fmode;
 580         write_unlock_bh(&pmc->sflock);
 581         err = 0;
 582 done:
 583         read_unlock_bh(&ipv6_sk_mc_lock);
 584         read_unlock_bh(&idev->lock);
 585         in6_dev_put(idev);
 586         dev_put(dev);
 587         if (leavegroup)
 588                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 589         return err;
 590 }
 591
 592 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 593         struct group_filter __user *optval, int __user *optlen)
 594 {
 595         int err, i, count, copycount;
 596         struct in6_addr *group;
 597         struct ipv6_mc_socklist *pmc;
 598         struct inet6_dev *idev;
 599         struct net_device *dev;
 600         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 601         struct ip6_sf_socklist *psl;
 602         struct net *net = sock_net(sk);
 603
 604         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 605
 606         if (!ipv6_addr_is_multicast(group))
 607                 return -EINVAL;
 608
 609         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 610
 611         if (!idev)
 612                 return -ENODEV;
 613
 614         dev = idev->dev;
 615
 616         err = -EADDRNOTAVAIL;
 617         /*
 618          * changes to the ipv6_mc_list require the socket lock and
 619          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 620          * so reading the list is safe.
 621          */
 622
 623         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 624                 if (pmc->ifindex != gsf->gf_interface)
 625                         continue;
 626                 if (ipv6_addr_equal(group, &pmc->addr))
 627                         break;
 628         }
 629         if (!pmc)               /* must have a prior join */
 630                 goto done;
 631         gsf->gf_fmode = pmc->sfmode;
 632         psl = pmc->sflist;
 633         count = psl ? psl->sl_count : 0;
 634         read_unlock_bh(&idev->lock);
 635         in6_dev_put(idev);
 636         dev_put(dev);
 637
 638         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 639         gsf->gf_numsrc = count;
 640         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 641             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 642                 return -EFAULT;
 643         }
 644         /* changes to psl require the socket lock, a read lock on
 645          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 646          * have the socket lock, so reading here is safe.
 647          */
 648         for (i=0; i<copycount; i++) {
 649                 struct sockaddr_in6 *psin6;
 650                 struct sockaddr_storage ss;
 651
 652                 psin6 = (struct sockaddr_in6 *)&ss;
 653                 memset(&ss, 0, sizeof(ss));
 654                 psin6->sin6_family = AF_INET6;
 655                 psin6->sin6_addr = psl->sl_addr[i];
 656                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 657                         return -EFAULT;
 658         }
 659         return 0;
 660 done:
 661         read_unlock_bh(&idev->lock);
 662         in6_dev_put(idev);
 663         dev_put(dev);
 664         return err;
 665 }
 666
 667 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
 668         struct in6_addr *src_addr)
 669 {
 670         struct ipv6_pinfo *np = inet6_sk(sk);
 671         struct ipv6_mc_socklist *mc;
 672         struct ip6_sf_socklist *psl;
 673         int rv = 1;
 674
 675         read_lock(&ipv6_sk_mc_lock);
 676         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 677                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 678                         break;
 679         }
 680         if (!mc) {
 681                 read_unlock(&ipv6_sk_mc_lock);
 682                 return 1;
 683         }
 684         read_lock(&mc->sflock);
 685         psl = mc->sflist;
 686         if (!psl) {
 687                 rv = mc->sfmode == MCAST_EXCLUDE;
 688         } else {
 689                 int i;
 690
 691                 for (i=0; i<psl->sl_count; i++) {
 692                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 693                                 break;
 694                 }
 695                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 696                         rv = 0;
 697                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 698                         rv = 0;
 699         }
 700         read_unlock(&mc->sflock);
 701         read_unlock(&ipv6_sk_mc_lock);
 702
 703         return rv;
 704 }
 705
 706 static void ma_put(struct ifmcaddr6 *mc)
 707 {
 708         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 709                 in6_dev_put(mc->idev);
 710                 kfree(mc);
 711         }
 712 }
 713
 714 static void igmp6_group_added(struct ifmcaddr6 *mc)
 715 {
 716         struct net_device *dev = mc->idev->dev;
 717         char buf[MAX_ADDR_LEN];
 718
 719         spin_lock_bh(&mc->mca_lock);
 720         if (!(mc->mca_flags&MAF_LOADED)) {
 721                 mc->mca_flags |= MAF_LOADED;
 722                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 723                         dev_mc_add(dev, buf, dev->addr_len, 0);
 724         }
 725         spin_unlock_bh(&mc->mca_lock);
 726
 727         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 728                 return;
 729
 730         if (MLD_V1_SEEN(mc->idev)) {
 731                 igmp6_join_group(mc);
 732                 return;
 733         }
 734         /* else v2 */
 735
 736         mc->mca_crcount = mc->idev->mc_qrv;
 737         mld_ifc_event(mc->idev);
 738 }
 739
 740 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 741 {
 742         struct net_device *dev = mc->idev->dev;
 743         char buf[MAX_ADDR_LEN];
 744
 745         spin_lock_bh(&mc->mca_lock);
 746         if (mc->mca_flags&MAF_LOADED) {
 747                 mc->mca_flags &= ~MAF_LOADED;
 748                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 749                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 750         }
 751
 752         if (mc->mca_flags & MAF_NOREPORT)
 753                 goto done;
 754         spin_unlock_bh(&mc->mca_lock);
 755
 756         if (!mc->idev->dead)
 757                 igmp6_leave_group(mc);
 758
 759         spin_lock_bh(&mc->mca_lock);
 760         if (del_timer(&mc->mca_timer))
 761                 atomic_dec(&mc->mca_refcnt);
 762 done:
 763         ip6_mc_clear_src(mc);
 764         spin_unlock_bh(&mc->mca_lock);
 765 }
 766
 767 /*
 768  * deleted ifmcaddr6 manipulation
 769  */
 770 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 771 {
 772         struct ifmcaddr6 *pmc;
 773
 774         /* this is an "ifmcaddr6" for convenience; only the fields below
 775          * are actually used. In particular, the refcnt and users are not
 776          * used for management of the delete list. Using the same structure
 777          * for deleted items allows change reports to use common code with
 778          * non-deleted or query-response MCA's.
 779          */
 780         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 781         if (!pmc)
 782                 return;
 783
 784         spin_lock_bh(&im->mca_lock);
 785         spin_lock_init(&pmc->mca_lock);
 786         pmc->idev = im->idev;
 787         in6_dev_hold(idev);
 788         pmc->mca_addr = im->mca_addr;
 789         pmc->mca_crcount = idev->mc_qrv;
 790         pmc->mca_sfmode = im->mca_sfmode;
 791         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 792                 struct ip6_sf_list *psf;
 793
 794                 pmc->mca_tomb = im->mca_tomb;
 795                 pmc->mca_sources = im->mca_sources;
 796                 im->mca_tomb = im->mca_sources = NULL;
 797                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 798                         psf->sf_crcount = pmc->mca_crcount;
 799         }
 800         spin_unlock_bh(&im->mca_lock);
 801
 802         write_lock_bh(&idev->mc_lock);
 803         pmc->next = idev->mc_tomb;
 804         idev->mc_tomb = pmc;
 805         write_unlock_bh(&idev->mc_lock);
 806 }
 807
 808 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 809 {
 810         struct ifmcaddr6 *pmc, *pmc_prev;
 811         struct ip6_sf_list *psf, *psf_next;
 812
 813         write_lock_bh(&idev->mc_lock);
 814         pmc_prev = NULL;
 815         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 816                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 817                         break;
 818                 pmc_prev = pmc;
 819         }
 820         if (pmc) {
 821                 if (pmc_prev)
 822                         pmc_prev->next = pmc->next;
 823                 else
 824                         idev->mc_tomb = pmc->next;
 825         }
 826         write_unlock_bh(&idev->mc_lock);
 827         if (pmc) {
 828                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 829                         psf_next = psf->sf_next;
 830                         kfree(psf);
 831                 }
 832                 in6_dev_put(pmc->idev);
 833                 kfree(pmc);
 834         }
 835 }
 836
 837 static void mld_clear_delrec(struct inet6_dev *idev)
 838 {
 839         struct ifmcaddr6 *pmc, *nextpmc;
 840
 841         write_lock_bh(&idev->mc_lock);
 842         pmc = idev->mc_tomb;
 843         idev->mc_tomb = NULL;
 844         write_unlock_bh(&idev->mc_lock);
 845
 846         for (; pmc; pmc = nextpmc) {
 847                 nextpmc = pmc->next;
 848                 ip6_mc_clear_src(pmc);
 849                 in6_dev_put(pmc->idev);
 850                 kfree(pmc);
 851         }
 852
 853         /* clear dead sources, too */
 854         read_lock_bh(&idev->lock);
 855         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 856                 struct ip6_sf_list *psf, *psf_next;
 857
 858                 spin_lock_bh(&pmc->mca_lock);
 859                 psf = pmc->mca_tomb;
 860                 pmc->mca_tomb = NULL;
 861                 spin_unlock_bh(&pmc->mca_lock);
 862                 for (; psf; psf=psf_next) {
 863                         psf_next = psf->sf_next;
 864                         kfree(psf);
 865                 }
 866         }
 867         read_unlock_bh(&idev->lock);
 868 }
 869
 870
 871 /*
 872  *      device multicast group inc (add if not found)
 873  */
 874 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
 875 {
 876         struct ifmcaddr6 *mc;
 877         struct inet6_dev *idev;
 878
 879         idev = in6_dev_get(dev);
 880
 881         if (idev == NULL)
 882                 return -EINVAL;
 883
 884         write_lock_bh(&idev->lock);
 885         if (idev->dead) {
 886                 write_unlock_bh(&idev->lock);
 887                 in6_dev_put(idev);
 888                 return -ENODEV;
 889         }
 890
 891         for (mc = idev->mc_list; mc; mc = mc->next) {
 892                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 893                         mc->mca_users++;
 894                         write_unlock_bh(&idev->lock);
 895                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 896                                 NULL, 0);
 897                         in6_dev_put(idev);
 898                         return 0;
 899                 }
 900         }
 901
 902         /*
 903          *      not found: create a new one.
 904          */
 905
 906         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 907
 908         if (mc == NULL) {
 909                 write_unlock_bh(&idev->lock);
 910                 in6_dev_put(idev);
 911                 return -ENOMEM;
 912         }
 913
 914         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 915
 916         ipv6_addr_copy(&mc->mca_addr, addr);
 917         mc->idev = idev;
 918         mc->mca_users = 1;
 919         /* mca_stamp should be updated upon changes */
 920         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 921         atomic_set(&mc->mca_refcnt, 2);
 922         spin_lock_init(&mc->mca_lock);
 923
 924         /* initial mode is (EX, empty) */
 925         mc->mca_sfmode = MCAST_EXCLUDE;
 926         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 927
 928         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 929             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 930                 mc->mca_flags |= MAF_NOREPORT;
 931
 932         mc->next = idev->mc_list;
 933         idev->mc_list = mc;
 934         write_unlock_bh(&idev->lock);
 935
 936         mld_del_delrec(idev, &mc->mca_addr);
 937         igmp6_group_added(mc);
 938         ma_put(mc);
 939         return 0;
 940 }
 941
 942 /*
 943  *      device multicast group del
 944  */
 945 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
 946 {
 947         struct ifmcaddr6 *ma, **map;
 948
 949         write_lock_bh(&idev->lock);
 950         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 951                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 952                         if (--ma->mca_users == 0) {
 953                                 *map = ma->next;
 954                                 write_unlock_bh(&idev->lock);
 955
 956                                 igmp6_group_dropped(ma);
 957
 958                                 ma_put(ma);
 959                                 return 0;
 960                         }
 961                         write_unlock_bh(&idev->lock);
 962                         return 0;
 963                 }
 964         }
 965         write_unlock_bh(&idev->lock);
 966
 967         return -ENOENT;
 968 }
 969
 970 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
 971 {
 972         struct inet6_dev *idev = in6_dev_get(dev);
 973         int err;
 974
 975         if (!idev)
 976                 return -ENODEV;
 977
 978         err = __ipv6_dev_mc_dec(idev, addr);
 979
 980         in6_dev_put(idev);
 981
 982         return err;
 983 }
 984
 985 /*
 986  * identify MLD packets for MLD filter exceptions
 987  */
 988 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 989 {
 990         struct icmp6hdr *pic;
 991
 992         if (nexthdr != IPPROTO_ICMPV6)
 993                 return 0;
 994
 995         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 996                 return 0;
 997
 998         pic = icmp6_hdr(skb);
 999
1000         switch (pic->icmp6_type) {
1001         case ICMPV6_MGM_QUERY:
1002         case ICMPV6_MGM_REPORT:
1003         case ICMPV6_MGM_REDUCTION:
1004         case ICMPV6_MLD2_REPORT:
1005                 return 1;
1006         default:
1007                 break;
1008         }
1009         return 0;
1010 }
1011
1012 /*
1013  *      check if the interface/address pair is valid
1014  */
1015 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1016         struct in6_addr *src_addr)
1017 {
1018         struct inet6_dev *idev;
1019         struct ifmcaddr6 *mc;
1020         int rv = 0;
1021
1022         idev = in6_dev_get(dev);
1023         if (idev) {
1024                 read_lock_bh(&idev->lock);
1025                 for (mc = idev->mc_list; mc; mc=mc->next) {
1026                         if (ipv6_addr_equal(&mc->mca_addr, group))
1027                                 break;
1028                 }
1029                 if (mc) {
1030                         if (src_addr && !ipv6_addr_any(src_addr)) {
1031                                 struct ip6_sf_list *psf;
1032
1033                                 spin_lock_bh(&mc->mca_lock);
1034                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1035                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1036                                                 break;
1037                                 }
1038                                 if (psf)
1039                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1040                                                 psf->sf_count[MCAST_EXCLUDE] !=
1041                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1042                                 else
1043                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1044                                 spin_unlock_bh(&mc->mca_lock);
1045                         } else
1046                                 rv = 1; /* don't filter unspecified source */
1047                 }
1048                 read_unlock_bh(&idev->lock);
1049                 in6_dev_put(idev);
1050         }
1051         return rv;
1052 }
1053
1054 static void mld_gq_start_timer(struct inet6_dev *idev)
1055 {
1056         int tv = net_random() % idev->mc_maxdelay;
1057
1058         idev->mc_gq_running = 1;
1059         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1060                 in6_dev_hold(idev);
1061 }
1062
1063 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1064 {
1065         int tv = net_random() % delay;
1066
1067         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1068                 in6_dev_hold(idev);
1069 }
1070
1071 /*
1072  *      IGMP handling (alias multicast ICMPv6 messages)
1073  */
1074
1075 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1076 {
1077         unsigned long delay = resptime;
1078
1079         /* Do not start timer for these addresses */
1080         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1081             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1082                 return;
1083
1084         if (del_timer(&ma->mca_timer)) {
1085                 atomic_dec(&ma->mca_refcnt);
1086                 delay = ma->mca_timer.expires - jiffies;
1087         }
1088
1089         if (delay >= resptime) {
1090                 if (resptime)
1091                         delay = net_random() % resptime;
1092                 else
1093                         delay = 1;
1094         }
1095         ma->mca_timer.expires = jiffies + delay;
1096         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1097                 atomic_inc(&ma->mca_refcnt);
1098         ma->mca_flags |= MAF_TIMER_RUNNING;
1099 }
1100
1101 /* mark EXCLUDE-mode sources */
1102 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1103         struct in6_addr *srcs)
1104 {
1105         struct ip6_sf_list *psf;
1106         int i, scount;
1107
1108         scount = 0;
1109         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1110                 if (scount == nsrcs)
1111                         break;
1112                 for (i=0; i<nsrcs; i++) {
1113                         /* skip inactive filters */
1114                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1115                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1116                             psf->sf_count[MCAST_EXCLUDE])
1117                                 continue;
1118                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1119                                 scount++;
1120                                 break;
1121                         }
1122                 }
1123         }
1124         pmc->mca_flags &= ~MAF_GSQUERY;
1125         if (scount == nsrcs)    /* all sources excluded */
1126                 return 0;
1127         return 1;
1128 }
1129
1130 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1131         struct in6_addr *srcs)
1132 {
1133         struct ip6_sf_list *psf;
1134         int i, scount;
1135
1136         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1137                 return mld_xmarksources(pmc, nsrcs, srcs);
1138
1139         /* mark INCLUDE-mode sources */
1140
1141         scount = 0;
1142         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1143                 if (scount == nsrcs)
1144                         break;
1145                 for (i=0; i<nsrcs; i++) {
1146                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1147                                 psf->sf_gsresp = 1;
1148                                 scount++;
1149                                 break;
1150                         }
1151                 }
1152         }
1153         if (!scount) {
1154                 pmc->mca_flags &= ~MAF_GSQUERY;
1155                 return 0;
1156         }
1157         pmc->mca_flags |= MAF_GSQUERY;
1158         return 1;
1159 }
1160
1161 int igmp6_event_query(struct sk_buff *skb)
1162 {
1163         struct mld2_query *mlh2 = NULL;
1164         struct ifmcaddr6 *ma;
1165         struct in6_addr *group;
1166         unsigned long max_delay;
1167         struct inet6_dev *idev;
1168         struct icmp6hdr *hdr;
1169         int group_type;
1170         int mark = 0;
1171         int len;
1172
1173         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1174                 return -EINVAL;
1175
1176         /* compute payload length excluding extension headers */
1177         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1178         len -= skb_network_header_len(skb);
1179
1180         /* Drop queries with not link local source */
1181         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1182                 return -EINVAL;
1183
1184         idev = in6_dev_get(skb->dev);
1185
1186         if (idev == NULL)
1187                 return 0;
1188
1189         hdr = icmp6_hdr(skb);
1190         group = (struct in6_addr *) (hdr + 1);
1191         group_type = ipv6_addr_type(group);
1192
1193         if (group_type != IPV6_ADDR_ANY &&
1194             !(group_type&IPV6_ADDR_MULTICAST)) {
1195                 in6_dev_put(idev);
1196                 return -EINVAL;
1197         }
1198
1199         if (len == 24) {
1200                 int switchback;
1201                 /* MLDv1 router present */
1202
1203                 /* Translate milliseconds to jiffies */
1204                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1205
1206                 switchback = (idev->mc_qrv + 1) * max_delay;
1207                 idev->mc_v1_seen = jiffies + switchback;
1208
1209                 /* cancel the interface change timer */
1210                 idev->mc_ifc_count = 0;
1211                 if (del_timer(&idev->mc_ifc_timer))
1212                         __in6_dev_put(idev);
1213                 /* clear deleted report items */
1214                 mld_clear_delrec(idev);
1215         } else if (len >= 28) {
1216                 int srcs_offset = sizeof(struct mld2_query) -
1217                                   sizeof(struct icmp6hdr);
1218                 if (!pskb_may_pull(skb, srcs_offset)) {
1219                         in6_dev_put(idev);
1220                         return -EINVAL;
1221                 }
1222                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1223                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1224                 if (!max_delay)
1225                         max_delay = 1;
1226                 idev->mc_maxdelay = max_delay;
1227                 if (mlh2->qrv)
1228                         idev->mc_qrv = mlh2->qrv;
1229                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1230                         if (mlh2->nsrcs) {
1231                                 in6_dev_put(idev);
1232                                 return -EINVAL; /* no sources allowed */
1233                         }
1234                         mld_gq_start_timer(idev);
1235                         in6_dev_put(idev);
1236                         return 0;
1237                 }
1238                 /* mark sources to include, if group & source-specific */
1239                 if (mlh2->nsrcs != 0) {
1240                         if (!pskb_may_pull(skb, srcs_offset +
1241                             ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1242                                 in6_dev_put(idev);
1243                                 return -EINVAL;
1244                         }
1245                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1246                         mark = 1;
1247                 }
1248         } else {
1249                 in6_dev_put(idev);
1250                 return -EINVAL;
1251         }
1252
1253         read_lock_bh(&idev->lock);
1254         if (group_type == IPV6_ADDR_ANY) {
1255                 for (ma = idev->mc_list; ma; ma=ma->next) {
1256                         spin_lock_bh(&ma->mca_lock);
1257                         igmp6_group_queried(ma, max_delay);
1258                         spin_unlock_bh(&ma->mca_lock);
1259                 }
1260         } else {
1261                 for (ma = idev->mc_list; ma; ma=ma->next) {
1262                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1263                                 continue;
1264                         spin_lock_bh(&ma->mca_lock);
1265                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1266                                 /* gsquery <- gsquery && mark */
1267                                 if (!mark)
1268                                         ma->mca_flags &= ~MAF_GSQUERY;
1269                         } else {
1270                                 /* gsquery <- mark */
1271                                 if (mark)
1272                                         ma->mca_flags |= MAF_GSQUERY;
1273                                 else
1274                                         ma->mca_flags &= ~MAF_GSQUERY;
1275                         }
1276                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1277                             mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1278                                 igmp6_group_queried(ma, max_delay);
1279                         spin_unlock_bh(&ma->mca_lock);
1280                         break;
1281                 }
1282         }
1283         read_unlock_bh(&idev->lock);
1284         in6_dev_put(idev);
1285
1286         return 0;
1287 }
1288
1289
1290 int igmp6_event_report(struct sk_buff *skb)
1291 {
1292         struct ifmcaddr6 *ma;
1293         struct in6_addr *addrp;
1294         struct inet6_dev *idev;
1295         struct icmp6hdr *hdr;
1296         int addr_type;
1297
1298         /* Our own report looped back. Ignore it. */
1299         if (skb->pkt_type == PACKET_LOOPBACK)
1300                 return 0;
1301
1302         /* send our report if the MC router may not have heard this report */
1303         if (skb->pkt_type != PACKET_MULTICAST &&
1304             skb->pkt_type != PACKET_BROADCAST)
1305                 return 0;
1306
1307         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1308                 return -EINVAL;
1309
1310         hdr = icmp6_hdr(skb);
1311
1312         /* Drop reports with not link local source */
1313         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1314         if (addr_type != IPV6_ADDR_ANY &&
1315             !(addr_type&IPV6_ADDR_LINKLOCAL))
1316                 return -EINVAL;
1317
1318         addrp = (struct in6_addr *) (hdr + 1);
1319
1320         idev = in6_dev_get(skb->dev);
1321         if (idev == NULL)
1322                 return -ENODEV;
1323
1324         /*
1325          *      Cancel the timer for this group
1326          */
1327
1328         read_lock_bh(&idev->lock);
1329         for (ma = idev->mc_list; ma; ma=ma->next) {
1330                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1331                         spin_lock(&ma->mca_lock);
1332                         if (del_timer(&ma->mca_timer))
1333                                 atomic_dec(&ma->mca_refcnt);
1334                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1335                         spin_unlock(&ma->mca_lock);
1336                         break;
1337                 }
1338         }
1339         read_unlock_bh(&idev->lock);
1340         in6_dev_put(idev);
1341         return 0;
1342 }
1343
1344 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1345         int gdeleted, int sdeleted)
1346 {
1347         switch (type) {
1348         case MLD2_MODE_IS_INCLUDE:
1349         case MLD2_MODE_IS_EXCLUDE:
1350                 if (gdeleted || sdeleted)
1351                         return 0;
1352                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1353                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1354                                 return 1;
1355                         /* don't include if this source is excluded
1356                          * in all filters
1357                          */
1358                         if (psf->sf_count[MCAST_INCLUDE])
1359                                 return type == MLD2_MODE_IS_INCLUDE;
1360                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1361                                 psf->sf_count[MCAST_EXCLUDE];
1362                 }
1363                 return 0;
1364         case MLD2_CHANGE_TO_INCLUDE:
1365                 if (gdeleted || sdeleted)
1366                         return 0;
1367                 return psf->sf_count[MCAST_INCLUDE] != 0;
1368         case MLD2_CHANGE_TO_EXCLUDE:
1369                 if (gdeleted || sdeleted)
1370                         return 0;
1371                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1372                     psf->sf_count[MCAST_INCLUDE])
1373                         return 0;
1374                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1375                         psf->sf_count[MCAST_EXCLUDE];
1376         case MLD2_ALLOW_NEW_SOURCES:
1377                 if (gdeleted || !psf->sf_crcount)
1378                         return 0;
1379                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1380         case MLD2_BLOCK_OLD_SOURCES:
1381                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1382                         return gdeleted || (psf->sf_crcount && sdeleted);
1383                 return psf->sf_crcount && !gdeleted && !sdeleted;
1384         }
1385         return 0;
1386 }
1387
1388 static int
1389 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1390 {
1391         struct ip6_sf_list *psf;
1392         int scount = 0;
1393
1394         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1395                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1396                         continue;
1397                 scount++;
1398         }
1399         return scount;
1400 }
1401
1402 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1403 {
1404         struct net *net = dev_net(dev);
1405         struct sock *sk = net->ipv6.igmp_sk;
1406         struct sk_buff *skb;
1407         struct mld2_report *pmr;
1408         struct in6_addr addr_buf;
1409         int err;
1410         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1411                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1412                      IPV6_TLV_PADN, 0 };
1413
1414         /* we assume size > sizeof(ra) here */
1415         skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1416
1417         if (!skb)
1418                 return NULL;
1419
1420         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1421
1422         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1423                 /* <draft-ietf-magma-mld-source-05.txt>:
1424                  * use unspecified address as the source address
1425                  * when a valid link-local address is not available.
1426                  */
1427                 memset(&addr_buf, 0, sizeof(addr_buf));
1428         }
1429
1430         ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1431
1432         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1433
1434         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1435         skb_put(skb, sizeof(*pmr));
1436         pmr = (struct mld2_report *)skb_transport_header(skb);
1437         pmr->type = ICMPV6_MLD2_REPORT;
1438         pmr->resv1 = 0;
1439         pmr->csum = 0;
1440         pmr->resv2 = 0;
1441         pmr->ngrec = 0;
1442         return skb;
1443 }
1444
1445 static void mld_sendpack(struct sk_buff *skb)
1446 {
1447         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1448         struct mld2_report *pmr =
1449                               (struct mld2_report *)skb_transport_header(skb);
1450         int payload_len, mldlen;
1451         struct inet6_dev *idev = in6_dev_get(skb->dev);
1452         struct net *net = dev_net(skb->dev);
1453         int err;
1454         struct flowi fl;
1455
1456         IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1457         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1458         mldlen = skb->tail - skb->transport_header;
1459         pip6->payload_len = htons(payload_len);
1460
1461         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1462                 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1463                                              mldlen, 0));
1464
1465         skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1466
1467         if (!skb->dst) {
1468                 err = -ENOMEM;
1469                 goto err_out;
1470         }
1471
1472         icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1473                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1474                          skb->dev->ifindex);
1475
1476         err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1477         if (err)
1478                 goto err_out;
1479
1480         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1481                       dst_output);
1482 out:
1483         if (!err) {
1484                 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1485                 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1486                 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1487         } else
1488                 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1489
1490         if (likely(idev != NULL))
1491                 in6_dev_put(idev);
1492         return;
1493
1494 err_out:
1495         kfree_skb(skb);
1496         goto out;
1497 }
1498
1499 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1500 {
1501         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1502 }
1503
1504 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1505         int type, struct mld2_grec **ppgr)
1506 {
1507         struct net_device *dev = pmc->idev->dev;
1508         struct mld2_report *pmr;
1509         struct mld2_grec *pgr;
1510
1511         if (!skb)
1512                 skb = mld_newpack(dev, dev->mtu);
1513         if (!skb)
1514                 return NULL;
1515         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1516         pgr->grec_type = type;
1517         pgr->grec_auxwords = 0;
1518         pgr->grec_nsrcs = 0;
1519         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1520         pmr = (struct mld2_report *)skb_transport_header(skb);
1521         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1522         *ppgr = pgr;
1523         return skb;
1524 }
1525
1526 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1527         skb_tailroom(skb)) : 0)
1528
1529 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1530         int type, int gdeleted, int sdeleted)
1531 {
1532         struct net_device *dev = pmc->idev->dev;
1533         struct mld2_report *pmr;
1534         struct mld2_grec *pgr = NULL;
1535         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1536         int scount, stotal, first, isquery, truncate;
1537
1538         if (pmc->mca_flags & MAF_NOREPORT)
1539                 return skb;
1540
1541         isquery = type == MLD2_MODE_IS_INCLUDE ||
1542                   type == MLD2_MODE_IS_EXCLUDE;
1543         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1544                     type == MLD2_CHANGE_TO_EXCLUDE;
1545
1546         stotal = scount = 0;
1547
1548         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1549
1550         if (!*psf_list)
1551                 goto empty_source;
1552
1553         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1554
1555         /* EX and TO_EX get a fresh packet, if needed */
1556         if (truncate) {
1557                 if (pmr && pmr->ngrec &&
1558                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1559                         if (skb)
1560                                 mld_sendpack(skb);
1561                         skb = mld_newpack(dev, dev->mtu);
1562                 }
1563         }
1564         first = 1;
1565         psf_prev = NULL;
1566         for (psf=*psf_list; psf; psf=psf_next) {
1567                 struct in6_addr *psrc;
1568
1569                 psf_next = psf->sf_next;
1570
1571                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1572                         psf_prev = psf;
1573                         continue;
1574                 }
1575
1576                 /* clear marks on query responses */
1577                 if (isquery)
1578                         psf->sf_gsresp = 0;
1579
1580                 if (AVAILABLE(skb) < sizeof(*psrc) +
1581                     first*sizeof(struct mld2_grec)) {
1582                         if (truncate && !first)
1583                                 break;   /* truncate these */
1584                         if (pgr)
1585                                 pgr->grec_nsrcs = htons(scount);
1586                         if (skb)
1587                                 mld_sendpack(skb);
1588                         skb = mld_newpack(dev, dev->mtu);
1589                         first = 1;
1590                         scount = 0;
1591                 }
1592                 if (first) {
1593                         skb = add_grhead(skb, pmc, type, &pgr);
1594                         first = 0;
1595                 }
1596                 if (!skb)
1597                         return NULL;
1598                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1599                 *psrc = psf->sf_addr;
1600                 scount++; stotal++;
1601                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1602                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1603                         psf->sf_crcount--;
1604                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1605                                 if (psf_prev)
1606                                         psf_prev->sf_next = psf->sf_next;
1607                                 else
1608                                         *psf_list = psf->sf_next;
1609                                 kfree(psf);
1610                                 continue;
1611                         }
1612                 }
1613                 psf_prev = psf;
1614         }
1615
1616 empty_source:
1617         if (!stotal) {
1618                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1619                     type == MLD2_BLOCK_OLD_SOURCES)
1620                         return skb;
1621                 if (pmc->mca_crcount || isquery) {
1622                         /* make sure we have room for group header */
1623                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1624                                 mld_sendpack(skb);
1625                                 skb = NULL; /* add_grhead will get a new one */
1626                         }
1627                         skb = add_grhead(skb, pmc, type, &pgr);
1628                 }
1629         }
1630         if (pgr)
1631                 pgr->grec_nsrcs = htons(scount);
1632
1633         if (isquery)
1634                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1635         return skb;
1636 }
1637
1638 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1639 {
1640         struct sk_buff *skb = NULL;
1641         int type;
1642
1643         if (!pmc) {
1644                 read_lock_bh(&idev->lock);
1645                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1646                         if (pmc->mca_flags & MAF_NOREPORT)
1647                                 continue;
1648                         spin_lock_bh(&pmc->mca_lock);
1649                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1650                                 type = MLD2_MODE_IS_EXCLUDE;
1651                         else
1652                                 type = MLD2_MODE_IS_INCLUDE;
1653                         skb = add_grec(skb, pmc, type, 0, 0);
1654                         spin_unlock_bh(&pmc->mca_lock);
1655                 }
1656                 read_unlock_bh(&idev->lock);
1657         } else {
1658                 spin_lock_bh(&pmc->mca_lock);
1659                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1660                         type = MLD2_MODE_IS_EXCLUDE;
1661                 else
1662                         type = MLD2_MODE_IS_INCLUDE;
1663                 skb = add_grec(skb, pmc, type, 0, 0);
1664                 spin_unlock_bh(&pmc->mca_lock);
1665         }
1666         if (skb)
1667                 mld_sendpack(skb);
1668 }
1669
1670 /*
1671  * remove zero-count source records from a source filter list
1672  */
1673 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1674 {
1675         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1676
1677         psf_prev = NULL;
1678         for (psf=*ppsf; psf; psf = psf_next) {
1679                 psf_next = psf->sf_next;
1680                 if (psf->sf_crcount == 0) {
1681                         if (psf_prev)
1682                                 psf_prev->sf_next = psf->sf_next;
1683                         else
1684                                 *ppsf = psf->sf_next;
1685                         kfree(psf);
1686                 } else
1687                         psf_prev = psf;
1688         }
1689 }
1690
1691 static void mld_send_cr(struct inet6_dev *idev)
1692 {
1693         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1694         struct sk_buff *skb = NULL;
1695         int type, dtype;
1696
1697         read_lock_bh(&idev->lock);
1698         write_lock_bh(&idev->mc_lock);
1699
1700         /* deleted MCA's */
1701         pmc_prev = NULL;
1702         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1703                 pmc_next = pmc->next;
1704                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1705                         type = MLD2_BLOCK_OLD_SOURCES;
1706                         dtype = MLD2_BLOCK_OLD_SOURCES;
1707                         skb = add_grec(skb, pmc, type, 1, 0);
1708                         skb = add_grec(skb, pmc, dtype, 1, 1);
1709                 }
1710                 if (pmc->mca_crcount) {
1711                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1712                                 type = MLD2_CHANGE_TO_INCLUDE;
1713                                 skb = add_grec(skb, pmc, type, 1, 0);
1714                         }
1715                         pmc->mca_crcount--;
1716                         if (pmc->mca_crcount == 0) {
1717                                 mld_clear_zeros(&pmc->mca_tomb);
1718                                 mld_clear_zeros(&pmc->mca_sources);
1719                         }
1720                 }
1721                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1722                     !pmc->mca_sources) {
1723                         if (pmc_prev)
1724                                 pmc_prev->next = pmc_next;
1725                         else
1726                                 idev->mc_tomb = pmc_next;
1727                         in6_dev_put(pmc->idev);
1728                         kfree(pmc);
1729                 } else
1730                         pmc_prev = pmc;
1731         }
1732         write_unlock_bh(&idev->mc_lock);
1733
1734         /* change recs */
1735         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1736                 spin_lock_bh(&pmc->mca_lock);
1737                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1738                         type = MLD2_BLOCK_OLD_SOURCES;
1739                         dtype = MLD2_ALLOW_NEW_SOURCES;
1740                 } else {
1741                         type = MLD2_ALLOW_NEW_SOURCES;
1742                         dtype = MLD2_BLOCK_OLD_SOURCES;
1743                 }
1744                 skb = add_grec(skb, pmc, type, 0, 0);
1745                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1746
1747                 /* filter mode changes */
1748                 if (pmc->mca_crcount) {
1749                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1750                                 type = MLD2_CHANGE_TO_EXCLUDE;
1751                         else
1752                                 type = MLD2_CHANGE_TO_INCLUDE;
1753                         skb = add_grec(skb, pmc, type, 0, 0);
1754                         pmc->mca_crcount--;
1755                 }
1756                 spin_unlock_bh(&pmc->mca_lock);
1757         }
1758         read_unlock_bh(&idev->lock);
1759         if (!skb)
1760                 return;
1761         (void) mld_sendpack(skb);
1762 }
1763
1764 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1765 {
1766         struct net *net = dev_net(dev);
1767         struct sock *sk = net->ipv6.igmp_sk;
1768         struct inet6_dev *idev;
1769         struct sk_buff *skb;
1770         struct icmp6hdr *hdr;
1771         struct in6_addr *snd_addr;
1772         struct in6_addr *addrp;
1773         struct in6_addr addr_buf;
1774         struct in6_addr all_routers;
1775         int err, len, payload_len, full_len;
1776         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1777                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1778                      IPV6_TLV_PADN, 0 };
1779         struct flowi fl;
1780
1781         rcu_read_lock();
1782         IP6_INC_STATS(__in6_dev_get(dev),
1783                       IPSTATS_MIB_OUTREQUESTS);
1784         rcu_read_unlock();
1785         snd_addr = addr;
1786         if (type == ICMPV6_MGM_REDUCTION) {
1787                 snd_addr = &all_routers;
1788                 ipv6_addr_all_routers(&all_routers);
1789         }
1790
1791         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1792         payload_len = len + sizeof(ra);
1793         full_len = sizeof(struct ipv6hdr) + payload_len;
1794
1795         skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1796
1797         if (skb == NULL) {
1798                 rcu_read_lock();
1799                 IP6_INC_STATS(__in6_dev_get(dev),
1800                               IPSTATS_MIB_OUTDISCARDS);
1801                 rcu_read_unlock();
1802                 return;
1803         }
1804
1805         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1806
1807         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1808                 /* <draft-ietf-magma-mld-source-05.txt>:
1809                  * use unspecified address as the source address
1810                  * when a valid link-local address is not available.
1811                  */
1812                 memset(&addr_buf, 0, sizeof(addr_buf));
1813         }
1814
1815         ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1816
1817         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1818
1819         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1820         memset(hdr, 0, sizeof(struct icmp6hdr));
1821         hdr->icmp6_type = type;
1822
1823         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1824         ipv6_addr_copy(addrp, addr);
1825
1826         hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1827                                            IPPROTO_ICMPV6,
1828                                            csum_partial((__u8 *) hdr, len, 0));
1829
1830         idev = in6_dev_get(skb->dev);
1831
1832         skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1833         if (!skb->dst) {
1834                 err = -ENOMEM;
1835                 goto err_out;
1836         }
1837
1838         icmpv6_flow_init(sk, &fl, type,
1839                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1840                          skb->dev->ifindex);
1841
1842         err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1843         if (err)
1844                 goto err_out;
1845
1846         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1847                       dst_output);
1848 out:
1849         if (!err) {
1850                 ICMP6MSGOUT_INC_STATS(idev, type);
1851                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1852                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1853         } else
1854                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1855
1856         if (likely(idev != NULL))
1857                 in6_dev_put(idev);
1858         return;
1859
1860 err_out:
1861         kfree_skb(skb);
1862         goto out;
1863 }
1864
1865 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1866         struct in6_addr *psfsrc)
1867 {
1868         struct ip6_sf_list *psf, *psf_prev;
1869         int rv = 0;
1870
1871         psf_prev = NULL;
1872         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1873                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1874                         break;
1875                 psf_prev = psf;
1876         }
1877         if (!psf || psf->sf_count[sfmode] == 0) {
1878                 /* source filter not found, or count wrong =>  bug */
1879                 return -ESRCH;
1880         }
1881         psf->sf_count[sfmode]--;
1882         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1883                 struct inet6_dev *idev = pmc->idev;
1884
1885                 /* no more filters for this source */
1886                 if (psf_prev)
1887                         psf_prev->sf_next = psf->sf_next;
1888                 else
1889                         pmc->mca_sources = psf->sf_next;
1890                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1891                     !MLD_V1_SEEN(idev)) {
1892                         psf->sf_crcount = idev->mc_qrv;
1893                         psf->sf_next = pmc->mca_tomb;
1894                         pmc->mca_tomb = psf;
1895                         rv = 1;
1896                 } else
1897                         kfree(psf);
1898         }
1899         return rv;
1900 }
1901
1902 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1903                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1904                           int delta)
1905 {
1906         struct ifmcaddr6 *pmc;
1907         int     changerec = 0;
1908         int     i, err;
1909
1910         if (!idev)
1911                 return -ENODEV;
1912         read_lock_bh(&idev->lock);
1913         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1914                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1915                         break;
1916         }
1917         if (!pmc) {
1918                 /* MCA not found?? bug */
1919                 read_unlock_bh(&idev->lock);
1920                 return -ESRCH;
1921         }
1922         spin_lock_bh(&pmc->mca_lock);
1923         sf_markstate(pmc);
1924         if (!delta) {
1925                 if (!pmc->mca_sfcount[sfmode]) {
1926                         spin_unlock_bh(&pmc->mca_lock);
1927                         read_unlock_bh(&idev->lock);
1928                         return -EINVAL;
1929                 }
1930                 pmc->mca_sfcount[sfmode]--;
1931         }
1932         err = 0;
1933         for (i=0; i<sfcount; i++) {
1934                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1935
1936                 changerec |= rv > 0;
1937                 if (!err && rv < 0)
1938                         err = rv;
1939         }
1940         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1941             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1942             pmc->mca_sfcount[MCAST_INCLUDE]) {
1943                 struct ip6_sf_list *psf;
1944
1945                 /* filter mode change */
1946                 pmc->mca_sfmode = MCAST_INCLUDE;
1947                 pmc->mca_crcount = idev->mc_qrv;
1948                 idev->mc_ifc_count = pmc->mca_crcount;
1949                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1950                         psf->sf_crcount = 0;
1951                 mld_ifc_event(pmc->idev);
1952         } else if (sf_setstate(pmc) || changerec)
1953                 mld_ifc_event(pmc->idev);
1954         spin_unlock_bh(&pmc->mca_lock);
1955         read_unlock_bh(&idev->lock);
1956         return err;
1957 }
1958
1959 /*
1960  * Add multicast single-source filter to the interface list
1961  */
1962 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1963         struct in6_addr *psfsrc, int delta)
1964 {
1965         struct ip6_sf_list *psf, *psf_prev;
1966
1967         psf_prev = NULL;
1968         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1969                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1970                         break;
1971                 psf_prev = psf;
1972         }
1973         if (!psf) {
1974                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1975                 if (!psf)
1976                         return -ENOBUFS;
1977
1978                 psf->sf_addr = *psfsrc;
1979                 if (psf_prev) {
1980                         psf_prev->sf_next = psf;
1981                 } else
1982                         pmc->mca_sources = psf;
1983         }
1984         psf->sf_count[sfmode]++;
1985         return 0;
1986 }
1987
1988 static void sf_markstate(struct ifmcaddr6 *pmc)
1989 {
1990         struct ip6_sf_list *psf;
1991         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1992
1993         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1994                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1995                         psf->sf_oldin = mca_xcount ==
1996                                 psf->sf_count[MCAST_EXCLUDE] &&
1997                                 !psf->sf_count[MCAST_INCLUDE];
1998                 } else
1999                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2000 }
2001
2002 static int sf_setstate(struct ifmcaddr6 *pmc)
2003 {
2004         struct ip6_sf_list *psf, *dpsf;
2005         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2006         int qrv = pmc->idev->mc_qrv;
2007         int new_in, rv;
2008
2009         rv = 0;
2010         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2011                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2012                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2013                                 !psf->sf_count[MCAST_INCLUDE];
2014                 } else
2015                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2016                 if (new_in) {
2017                         if (!psf->sf_oldin) {
2018                                 struct ip6_sf_list *prev = NULL;
2019
2020                                 for (dpsf=pmc->mca_tomb; dpsf;
2021                                      dpsf=dpsf->sf_next) {
2022                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2023                                             &psf->sf_addr))
2024                                                 break;
2025                                         prev = dpsf;
2026                                 }
2027                                 if (dpsf) {
2028                                         if (prev)
2029                                                 prev->sf_next = dpsf->sf_next;
2030                                         else
2031                                                 pmc->mca_tomb = dpsf->sf_next;
2032                                         kfree(dpsf);
2033                                 }
2034                                 psf->sf_crcount = qrv;
2035                                 rv++;
2036                         }
2037                 } else if (psf->sf_oldin) {
2038                         psf->sf_crcount = 0;
2039                         /*
2040                          * add or update "delete" records if an active filter
2041                          * is now inactive
2042                          */
2043                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2044                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2045                                     &psf->sf_addr))
2046                                         break;
2047                         if (!dpsf) {
2048                                 dpsf = (struct ip6_sf_list *)
2049                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2050                                 if (!dpsf)
2051                                         continue;
2052                                 *dpsf = *psf;
2053                                 /* pmc->mca_lock held by callers */
2054                                 dpsf->sf_next = pmc->mca_tomb;
2055                                 pmc->mca_tomb = dpsf;
2056                         }
2057                         dpsf->sf_crcount = qrv;
2058                         rv++;
2059                 }
2060         }
2061         return rv;
2062 }
2063
2064 /*
2065  * Add multicast source filter list to the interface list
2066  */
2067 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2068                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2069                           int delta)
2070 {
2071         struct ifmcaddr6 *pmc;
2072         int     isexclude;
2073         int     i, err;
2074
2075         if (!idev)
2076                 return -ENODEV;
2077         read_lock_bh(&idev->lock);
2078         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2079                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2080                         break;
2081         }
2082         if (!pmc) {
2083                 /* MCA not found?? bug */
2084                 read_unlock_bh(&idev->lock);
2085                 return -ESRCH;
2086         }
2087         spin_lock_bh(&pmc->mca_lock);
2088
2089         sf_markstate(pmc);
2090         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2091         if (!delta)
2092                 pmc->mca_sfcount[sfmode]++;
2093         err = 0;
2094         for (i=0; i<sfcount; i++) {
2095                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2096                 if (err)
2097                         break;
2098         }
2099         if (err) {
2100                 int j;
2101
2102                 if (!delta)
2103                         pmc->mca_sfcount[sfmode]--;
2104                 for (j=0; j<i; j++)
2105                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2106         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2107                 struct inet6_dev *idev = pmc->idev;
2108                 struct ip6_sf_list *psf;
2109
2110                 /* filter mode change */
2111                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2112                         pmc->mca_sfmode = MCAST_EXCLUDE;
2113                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2114                         pmc->mca_sfmode = MCAST_INCLUDE;
2115                 /* else no filters; keep old mode for reports */
2116
2117                 pmc->mca_crcount = idev->mc_qrv;
2118                 idev->mc_ifc_count = pmc->mca_crcount;
2119                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2120                         psf->sf_crcount = 0;
2121                 mld_ifc_event(idev);
2122         } else if (sf_setstate(pmc))
2123                 mld_ifc_event(idev);
2124         spin_unlock_bh(&pmc->mca_lock);
2125         read_unlock_bh(&idev->lock);
2126         return err;
2127 }
2128
2129 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2130 {
2131         struct ip6_sf_list *psf, *nextpsf;
2132
2133         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2134                 nextpsf = psf->sf_next;
2135                 kfree(psf);
2136         }
2137         pmc->mca_tomb = NULL;
2138         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2139                 nextpsf = psf->sf_next;
2140                 kfree(psf);
2141         }
2142         pmc->mca_sources = NULL;
2143         pmc->mca_sfmode = MCAST_EXCLUDE;
2144         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2145         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2146 }
2147
2148
2149 static void igmp6_join_group(struct ifmcaddr6 *ma)
2150 {
2151         unsigned long delay;
2152
2153         if (ma->mca_flags & MAF_NOREPORT)
2154                 return;
2155
2156         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2157
2158         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2159
2160         spin_lock_bh(&ma->mca_lock);
2161         if (del_timer(&ma->mca_timer)) {
2162                 atomic_dec(&ma->mca_refcnt);
2163                 delay = ma->mca_timer.expires - jiffies;
2164         }
2165
2166         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2167                 atomic_inc(&ma->mca_refcnt);
2168         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2169         spin_unlock_bh(&ma->mca_lock);
2170 }
2171
2172 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2173                             struct inet6_dev *idev)
2174 {
2175         int err;
2176
2177         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2178          * so no other readers or writers of iml or its sflist
2179          */
2180         if (!iml->sflist) {
2181                 /* any-source empty exclude case */
2182                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2183         }
2184         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2185                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2186         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2187         iml->sflist = NULL;
2188         return err;
2189 }
2190
2191 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2192 {
2193         if (MLD_V1_SEEN(ma->idev)) {
2194                 if (ma->mca_flags & MAF_LAST_REPORTER)
2195                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2196                                 ICMPV6_MGM_REDUCTION);
2197         } else {
2198                 mld_add_delrec(ma->idev, ma);
2199                 mld_ifc_event(ma->idev);
2200         }
2201 }
2202
2203 static void mld_gq_timer_expire(unsigned long data)
2204 {
2205         struct inet6_dev *idev = (struct inet6_dev *)data;
2206
2207         idev->mc_gq_running = 0;
2208         mld_send_report(idev, NULL);
2209         __in6_dev_put(idev);
2210 }
2211
2212 static void mld_ifc_timer_expire(unsigned long data)
2213 {
2214         struct inet6_dev *idev = (struct inet6_dev *)data;
2215
2216         mld_send_cr(idev);
2217         if (idev->mc_ifc_count) {
2218                 idev->mc_ifc_count--;
2219                 if (idev->mc_ifc_count)
2220                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2221         }
2222         __in6_dev_put(idev);
2223 }
2224
2225 static void mld_ifc_event(struct inet6_dev *idev)
2226 {
2227         if (MLD_V1_SEEN(idev))
2228                 return;
2229         idev->mc_ifc_count = idev->mc_qrv;
2230         mld_ifc_start_timer(idev, 1);
2231 }
2232
2233
2234 static void igmp6_timer_handler(unsigned long data)
2235 {
2236         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2237
2238         if (MLD_V1_SEEN(ma->idev))
2239                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2240         else
2241                 mld_send_report(ma->idev, ma);
2242
2243         spin_lock(&ma->mca_lock);
2244         ma->mca_flags |=  MAF_LAST_REPORTER;
2245         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2246         spin_unlock(&ma->mca_lock);
2247         ma_put(ma);
2248 }
2249
2250 /* Device going down */
2251
2252 void ipv6_mc_down(struct inet6_dev *idev)
2253 {
2254         struct ifmcaddr6 *i;
2255
2256         /* Withdraw multicast list */
2257
2258         read_lock_bh(&idev->lock);
2259         idev->mc_ifc_count = 0;
2260         if (del_timer(&idev->mc_ifc_timer))
2261                 __in6_dev_put(idev);
2262         idev->mc_gq_running = 0;
2263         if (del_timer(&idev->mc_gq_timer))
2264                 __in6_dev_put(idev);
2265
2266         for (i = idev->mc_list; i; i=i->next)
2267                 igmp6_group_dropped(i);
2268         read_unlock_bh(&idev->lock);
2269
2270         mld_clear_delrec(idev);
2271 }
2272
2273
2274 /* Device going up */
2275
2276 void ipv6_mc_up(struct inet6_dev *idev)
2277 {
2278         struct ifmcaddr6 *i;
2279
2280         /* Install multicast list, except for all-nodes (already installed) */
2281
2282         read_lock_bh(&idev->lock);
2283         for (i = idev->mc_list; i; i=i->next)
2284                 igmp6_group_added(i);
2285         read_unlock_bh(&idev->lock);
2286 }
2287
2288 /* IPv6 device initialization. */
2289
2290 void ipv6_mc_init_dev(struct inet6_dev *idev)
2291 {
2292         write_lock_bh(&idev->lock);
2293         rwlock_init(&idev->mc_lock);
2294         idev->mc_gq_running = 0;
2295         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2296                         (unsigned long)idev);
2297         idev->mc_tomb = NULL;
2298         idev->mc_ifc_count = 0;
2299         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2300                         (unsigned long)idev);
2301         idev->mc_qrv = MLD_QRV_DEFAULT;
2302         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2303         idev->mc_v1_seen = 0;
2304         write_unlock_bh(&idev->lock);
2305 }
2306
2307 /*
2308  *      Device is about to be destroyed: clean up.
2309  */
2310
2311 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2312 {
2313         struct ifmcaddr6 *i;
2314         struct in6_addr maddr;
2315
2316         /* Deactivate timers */
2317         ipv6_mc_down(idev);
2318
2319         /* Delete all-nodes address. */
2320         ipv6_addr_all_nodes(&maddr);
2321
2322         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2323          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2324          * fail.
2325          */
2326         __ipv6_dev_mc_dec(idev, &maddr);
2327
2328         if (idev->cnf.forwarding) {
2329                 ipv6_addr_all_routers(&maddr);
2330                 __ipv6_dev_mc_dec(idev, &maddr);
2331         }
2332
2333         write_lock_bh(&idev->lock);
2334         while ((i = idev->mc_list) != NULL) {
2335                 idev->mc_list = i->next;
2336                 write_unlock_bh(&idev->lock);
2337
2338                 igmp6_group_dropped(i);
2339                 ma_put(i);
2340
2341                 write_lock_bh(&idev->lock);
2342         }
2343         write_unlock_bh(&idev->lock);
2344 }
2345
2346 #ifdef CONFIG_PROC_FS
2347 struct igmp6_mc_iter_state {
2348         struct seq_net_private p;
2349         struct net_device *dev;
2350         struct inet6_dev *idev;
2351 };
2352
2353 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2354
2355 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2356 {
2357         struct ifmcaddr6 *im = NULL;
2358         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2359         struct net *net = seq_file_net(seq);
2360
2361         state->idev = NULL;
2362         for_each_netdev(net, state->dev) {
2363                 struct inet6_dev *idev;
2364                 idev = in6_dev_get(state->dev);
2365                 if (!idev)
2366                         continue;
2367                 read_lock_bh(&idev->lock);
2368                 im = idev->mc_list;
2369                 if (im) {
2370                         state->idev = idev;
2371                         break;
2372                 }
2373                 read_unlock_bh(&idev->lock);
2374                 in6_dev_put(idev);
2375         }
2376         return im;
2377 }
2378
2379 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2380 {
2381         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2382
2383         im = im->next;
2384         while (!im) {
2385                 if (likely(state->idev != NULL)) {
2386                         read_unlock_bh(&state->idev->lock);
2387                         in6_dev_put(state->idev);
2388                 }
2389                 state->dev = next_net_device(state->dev);
2390                 if (!state->dev) {
2391                         state->idev = NULL;
2392                         break;
2393                 }
2394                 state->idev = in6_dev_get(state->dev);
2395                 if (!state->idev)
2396                         continue;
2397                 read_lock_bh(&state->idev->lock);
2398                 im = state->idev->mc_list;
2399         }
2400         return im;
2401 }
2402
2403 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2404 {
2405         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2406         if (im)
2407                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2408                         --pos;
2409         return pos ? NULL : im;
2410 }
2411
2412 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2413         __acquires(dev_base_lock)
2414 {
2415         read_lock(&dev_base_lock);
2416         return igmp6_mc_get_idx(seq, *pos);
2417 }
2418
2419 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2420 {
2421         struct ifmcaddr6 *im;
2422         im = igmp6_mc_get_next(seq, v);
2423         ++*pos;
2424         return im;
2425 }
2426
2427 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2428         __releases(dev_base_lock)
2429 {
2430         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2431         if (likely(state->idev != NULL)) {
2432                 read_unlock_bh(&state->idev->lock);
2433                 in6_dev_put(state->idev);
2434                 state->idev = NULL;
2435         }
2436         state->dev = NULL;
2437         read_unlock(&dev_base_lock);
2438 }
2439
2440 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2441 {
2442         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2443         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2444
2445         seq_printf(seq,
2446                    "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2447                    state->dev->ifindex, state->dev->name,
2448                    NIP6(im->mca_addr),
2449                    im->mca_users, im->mca_flags,
2450                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2451                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2452         return 0;
2453 }
2454
2455 static const struct seq_operations igmp6_mc_seq_ops = {
2456         .start  =       igmp6_mc_seq_start,
2457         .next   =       igmp6_mc_seq_next,
2458         .stop   =       igmp6_mc_seq_stop,
2459         .show   =       igmp6_mc_seq_show,
2460 };
2461
2462 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2463 {
2464         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2465                             sizeof(struct igmp6_mc_iter_state));
2466 }
2467
2468 static const struct file_operations igmp6_mc_seq_fops = {
2469         .owner          =       THIS_MODULE,
2470         .open           =       igmp6_mc_seq_open,
2471         .read           =       seq_read,
2472         .llseek         =       seq_lseek,
2473         .release        =       seq_release_net,
2474 };
2475
2476 struct igmp6_mcf_iter_state {
2477         struct seq_net_private p;
2478         struct net_device *dev;
2479         struct inet6_dev *idev;
2480         struct ifmcaddr6 *im;
2481 };
2482
2483 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2484
2485 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2486 {
2487         struct ip6_sf_list *psf = NULL;
2488         struct ifmcaddr6 *im = NULL;
2489         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2490         struct net *net = seq_file_net(seq);
2491
2492         state->idev = NULL;
2493         state->im = NULL;
2494         for_each_netdev(net, state->dev) {
2495                 struct inet6_dev *idev;
2496                 idev = in6_dev_get(state->dev);
2497                 if (unlikely(idev == NULL))
2498                         continue;
2499                 read_lock_bh(&idev->lock);
2500                 im = idev->mc_list;
2501                 if (likely(im != NULL)) {
2502                         spin_lock_bh(&im->mca_lock);
2503                         psf = im->mca_sources;
2504                         if (likely(psf != NULL)) {
2505                                 state->im = im;
2506                                 state->idev = idev;
2507                                 break;
2508                         }
2509                         spin_unlock_bh(&im->mca_lock);
2510                 }
2511                 read_unlock_bh(&idev->lock);
2512                 in6_dev_put(idev);
2513         }
2514         return psf;
2515 }
2516
2517 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2518 {
2519         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2520
2521         psf = psf->sf_next;
2522         while (!psf) {
2523                 spin_unlock_bh(&state->im->mca_lock);
2524                 state->im = state->im->next;
2525                 while (!state->im) {
2526                         if (likely(state->idev != NULL)) {
2527                                 read_unlock_bh(&state->idev->lock);
2528                                 in6_dev_put(state->idev);
2529                         }
2530                         state->dev = next_net_device(state->dev);
2531                         if (!state->dev) {
2532                                 state->idev = NULL;
2533                                 goto out;
2534                         }
2535                         state->idev = in6_dev_get(state->dev);
2536                         if (!state->idev)
2537                                 continue;
2538                         read_lock_bh(&state->idev->lock);
2539                         state->im = state->idev->mc_list;
2540                 }
2541                 if (!state->im)
2542                         break;
2543                 spin_lock_bh(&state->im->mca_lock);
2544                 psf = state->im->mca_sources;
2545         }
2546 out:
2547         return psf;
2548 }
2549
2550 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2551 {
2552         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2553         if (psf)
2554                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2555                         --pos;
2556         return pos ? NULL : psf;
2557 }
2558
2559 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2560         __acquires(dev_base_lock)
2561 {
2562         read_lock(&dev_base_lock);
2563         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2564 }
2565
2566 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2567 {
2568         struct ip6_sf_list *psf;
2569         if (v == SEQ_START_TOKEN)
2570                 psf = igmp6_mcf_get_first(seq);
2571         else
2572                 psf = igmp6_mcf_get_next(seq, v);
2573         ++*pos;
2574         return psf;
2575 }
2576
2577 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2578         __releases(dev_base_lock)
2579 {
2580         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2581         if (likely(state->im != NULL)) {
2582                 spin_unlock_bh(&state->im->mca_lock);
2583                 state->im = NULL;
2584         }
2585         if (likely(state->idev != NULL)) {
2586                 read_unlock_bh(&state->idev->lock);
2587                 in6_dev_put(state->idev);
2588                 state->idev = NULL;
2589         }
2590         state->dev = NULL;
2591         read_unlock(&dev_base_lock);
2592 }
2593
2594 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2595 {
2596         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2597         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2598
2599         if (v == SEQ_START_TOKEN) {
2600                 seq_printf(seq,
2601                            "%3s %6s "
2602                            "%32s %32s %6s %6s\n", "Idx",
2603                            "Device", "Multicast Address",
2604                            "Source Address", "INC", "EXC");
2605         } else {
2606                 seq_printf(seq,
2607                            "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2608                            state->dev->ifindex, state->dev->name,
2609                            NIP6(state->im->mca_addr),
2610                            NIP6(psf->sf_addr),
2611                            psf->sf_count[MCAST_INCLUDE],
2612                            psf->sf_count[MCAST_EXCLUDE]);
2613         }
2614         return 0;
2615 }
2616
2617 static const struct seq_operations igmp6_mcf_seq_ops = {
2618         .start  =       igmp6_mcf_seq_start,
2619         .next   =       igmp6_mcf_seq_next,
2620         .stop   =       igmp6_mcf_seq_stop,
2621         .show   =       igmp6_mcf_seq_show,
2622 };
2623
2624 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2625 {
2626         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2627                             sizeof(struct igmp6_mcf_iter_state));
2628 }
2629
2630 static const struct file_operations igmp6_mcf_seq_fops = {
2631         .owner          =       THIS_MODULE,
2632         .open           =       igmp6_mcf_seq_open,
2633         .read           =       seq_read,
2634         .llseek         =       seq_lseek,
2635         .release        =       seq_release_net,
2636 };
2637
2638 static int igmp6_proc_init(struct net *net)
2639 {
2640         int err;
2641
2642         err = -ENOMEM;
2643         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2644                 goto out;
2645         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2646                                   &igmp6_mcf_seq_fops))
2647                 goto out_proc_net_igmp6;
2648
2649         err = 0;
2650 out:
2651         return err;
2652
2653 out_proc_net_igmp6:
2654         proc_net_remove(net, "igmp6");
2655         goto out;
2656 }
2657
2658 static void igmp6_proc_exit(struct net *net)
2659 {
2660         proc_net_remove(net, "mcfilter6");
2661         proc_net_remove(net, "igmp6");
2662 }
2663 #else
2664 static int igmp6_proc_init(struct net *net)
2665 {
2666         return 0;
2667 }
2668 static void igmp6_proc_exit(struct net *net)
2669 {
2670         ;
2671 }
2672 #endif
2673
2674 static int igmp6_net_init(struct net *net)
2675 {
2676         int err;
2677
2678         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2679                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2680         if (err < 0) {
2681                 printk(KERN_ERR
2682                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2683                        err);
2684                 goto out;
2685         }
2686
2687         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2688
2689         err = igmp6_proc_init(net);
2690         if (err)
2691                 goto out_sock_create;
2692 out:
2693         return err;
2694
2695 out_sock_create:
2696         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2697         goto out;
2698 }
2699
2700 static void igmp6_net_exit(struct net *net)
2701 {
2702         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2703         igmp6_proc_exit(net);
2704 }
2705
2706 static struct pernet_operations igmp6_net_ops = {
2707         .init = igmp6_net_init,
2708         .exit = igmp6_net_exit,
2709 };
2710
2711 int __init igmp6_init(void)
2712 {
2713         return register_pernet_subsys(&igmp6_net_ops);
2714 }
2715
2716 void igmp6_cleanup(void)
2717 {
2718         unregister_pernet_subsys(&igmp6_net_ops);
2719 }