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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/config.h>
  32 #include <linux/module.h>
  33 #include <linux/errno.h>
  34 #include <linux/types.h>
  35 #include <linux/string.h>
  36 #include <linux/socket.h>
  37 #include <linux/sockios.h>
  38 #include <linux/jiffies.h>
  39 #include <linux/times.h>
  40 #include <linux/net.h>
  41 #include <linux/in.h>
  42 #include <linux/in6.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/if_arp.h>
  45 #include <linux/route.h>
  46 #include <linux/init.h>
  47 #include <linux/proc_fs.h>
  48 #include <linux/seq_file.h>
  49
  50 #include <linux/netfilter.h>
  51 #include <linux/netfilter_ipv6.h>
  52
  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
  63 #include <net/ip6_checksum.h>
  64
  65 /* Set to 3 to get tracing... */
  66 #define MCAST_DEBUG 2
  67
  68 #if MCAST_DEBUG >= 3
  69 #define MDBG(x) printk x
  70 #else
  71 #define MDBG(x)
  72 #endif
  73
  74 /*
  75  *  These header formats should be in a separate include file, but icmpv6.h
  76  *  doesn't have in6_addr defined in all cases, there is no __u128, and no
  77  *  other files reference these.
  78  *
  79  *                      +-DLS 4/14/03
  80  */
  81
  82 /* Multicast Listener Discovery version 2 headers */
  83
  84 struct mld2_grec {
  85         __u8            grec_type;
  86         __u8            grec_auxwords;
  87         __u16           grec_nsrcs;
  88         struct in6_addr grec_mca;
  89         struct in6_addr grec_src[0];
  90 };
  91
  92 struct mld2_report {
  93         __u8    type;
  94         __u8    resv1;
  95         __u16   csum;
  96         __u16   resv2;
  97         __u16   ngrec;
  98         struct mld2_grec grec[0];
  99 };
 100
 101 struct mld2_query {
 102         __u8 type;
 103         __u8 code;
 104         __u16 csum;
 105         __u16 mrc;
 106         __u16 resv1;
 107         struct in6_addr mca;
 108 #if defined(__LITTLE_ENDIAN_BITFIELD)
 109         __u8 qrv:3,
 110              suppress:1,
 111              resv2:4;
 112 #elif defined(__BIG_ENDIAN_BITFIELD)
 113         __u8 resv2:4,
 114              suppress:1,
 115              qrv:3;
 116 #else
 117 #error "Please fix <asm/byteorder.h>"
 118 #endif
 119         __u8 qqic;
 120         __u16 nsrcs;
 121         struct in6_addr srcs[0];
 122 };
 123
 124 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 125
 126 /* Big mc list lock for all the sockets */
 127 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
 128
 129 static struct socket *igmp6_socket;
 130
 131 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
 132
 133 static void igmp6_join_group(struct ifmcaddr6 *ma);
 134 static void igmp6_leave_group(struct ifmcaddr6 *ma);
 135 static void igmp6_timer_handler(unsigned long data);
 136
 137 static void mld_gq_timer_expire(unsigned long data);
 138 static void mld_ifc_timer_expire(unsigned long data);
 139 static void mld_ifc_event(struct inet6_dev *idev);
 140 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 141 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
 142 static void mld_clear_delrec(struct inet6_dev *idev);
 143 static int sf_setstate(struct ifmcaddr6 *pmc);
 144 static void sf_markstate(struct ifmcaddr6 *pmc);
 145 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 146 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 147                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 148                           int delta);
 149 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 150                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 151                           int delta);
 152 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 153                             struct inet6_dev *idev);
 154
 155
 156 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 157 #define MLD_QRV_DEFAULT         2
 158
 159 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
 160                 (idev)->cnf.force_mld_version == 1 || \
 161                 ((idev)->mc_v1_seen && \
 162                 time_before(jiffies, (idev)->mc_v1_seen)))
 163
 164 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 165 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
 166         ((value) < (thresh) ? (value) : \
 167         ((MLDV2_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \
 168         (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 169
 170 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
 171 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
 172
 173 #define IPV6_MLD_MAX_MSF        10
 174
 175 int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF;
 176
 177 /*
 178  *      socket join on multicast group
 179  */
 180
 181 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
 182 {
 183         struct net_device *dev = NULL;
 184         struct ipv6_mc_socklist *mc_lst;
 185         struct ipv6_pinfo *np = inet6_sk(sk);
 186         int err;
 187
 188         if (!ipv6_addr_is_multicast(addr))
 189                 return -EINVAL;
 190
 191         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 192
 193         if (mc_lst == NULL)
 194                 return -ENOMEM;
 195
 196         mc_lst->next = NULL;
 197         ipv6_addr_copy(&mc_lst->addr, addr);
 198
 199         if (ifindex == 0) {
 200                 struct rt6_info *rt;
 201                 rt = rt6_lookup(addr, NULL, 0, 0);
 202                 if (rt) {
 203                         dev = rt->rt6i_dev;
 204                         dev_hold(dev);
 205                         dst_release(&rt->u.dst);
 206                 }
 207         } else
 208                 dev = dev_get_by_index(ifindex);
 209
 210         if (dev == NULL) {
 211                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 212                 return -ENODEV;
 213         }
 214
 215         mc_lst->ifindex = dev->ifindex;
 216         mc_lst->sfmode = MCAST_EXCLUDE;
 217         mc_lst->sflist = NULL;
 218
 219         /*
 220          *      now add/increase the group membership on the device
 221          */
 222
 223         err = ipv6_dev_mc_inc(dev, addr);
 224
 225         if (err) {
 226                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 227                 dev_put(dev);
 228                 return err;
 229         }
 230
 231         write_lock_bh(&ipv6_sk_mc_lock);
 232         mc_lst->next = np->ipv6_mc_list;
 233         np->ipv6_mc_list = mc_lst;
 234         write_unlock_bh(&ipv6_sk_mc_lock);
 235
 236         dev_put(dev);
 237
 238         return 0;
 239 }
 240
 241 /*
 242  *      socket leave on multicast group
 243  */
 244 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 245 {
 246         struct ipv6_pinfo *np = inet6_sk(sk);
 247         struct ipv6_mc_socklist *mc_lst, **lnk;
 248
 249         write_lock_bh(&ipv6_sk_mc_lock);
 250         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 251                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 252                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 253                         struct net_device *dev;
 254
 255                         *lnk = mc_lst->next;
 256                         write_unlock_bh(&ipv6_sk_mc_lock);
 257
 258                         if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
 259                                 struct inet6_dev *idev = in6_dev_get(dev);
 260
 261                                 if (idev) {
 262                                         (void) ip6_mc_leave_src(sk,mc_lst,idev);
 263                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 264                                         in6_dev_put(idev);
 265                                 }
 266                                 dev_put(dev);
 267                         }
 268                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 269                         return 0;
 270                 }
 271         }
 272         write_unlock_bh(&ipv6_sk_mc_lock);
 273
 274         return -ENOENT;
 275 }
 276
 277 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
 278 {
 279         struct net_device *dev = NULL;
 280         struct inet6_dev *idev = NULL;
 281
 282         if (ifindex == 0) {
 283                 struct rt6_info *rt;
 284
 285                 rt = rt6_lookup(group, NULL, 0, 0);
 286                 if (rt) {
 287                         dev = rt->rt6i_dev;
 288                         dev_hold(dev);
 289                         dst_release(&rt->u.dst);
 290                 }
 291         } else
 292                 dev = dev_get_by_index(ifindex);
 293
 294         if (!dev)
 295                 return NULL;
 296         idev = in6_dev_get(dev);
 297         if (!idev) {
 298                 dev_put(dev);
 299                 return NULL;
 300         }
 301         read_lock_bh(&idev->lock);
 302         if (idev->dead) {
 303                 read_unlock_bh(&idev->lock);
 304                 in6_dev_put(idev);
 305                 dev_put(dev);
 306                 return NULL;
 307         }
 308         return idev;
 309 }
 310
 311 void ipv6_sock_mc_close(struct sock *sk)
 312 {
 313         struct ipv6_pinfo *np = inet6_sk(sk);
 314         struct ipv6_mc_socklist *mc_lst;
 315
 316         write_lock_bh(&ipv6_sk_mc_lock);
 317         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 318                 struct net_device *dev;
 319
 320                 np->ipv6_mc_list = mc_lst->next;
 321                 write_unlock_bh(&ipv6_sk_mc_lock);
 322
 323                 dev = dev_get_by_index(mc_lst->ifindex);
 324                 if (dev) {
 325                         struct inet6_dev *idev = in6_dev_get(dev);
 326
 327                         if (idev) {
 328                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 329                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 330                                 in6_dev_put(idev);
 331                         }
 332                         dev_put(dev);
 333                 }
 334
 335                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 336
 337                 write_lock_bh(&ipv6_sk_mc_lock);
 338         }
 339         write_unlock_bh(&ipv6_sk_mc_lock);
 340 }
 341
 342 int ip6_mc_source(int add, int omode, struct sock *sk,
 343         struct group_source_req *pgsr)
 344 {
 345         struct in6_addr *source, *group;
 346         struct ipv6_mc_socklist *pmc;
 347         struct net_device *dev;
 348         struct inet6_dev *idev;
 349         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 350         struct ip6_sf_socklist *psl;
 351         int i, j, rv;
 352         int err;
 353
 354         if (pgsr->gsr_group.ss_family != AF_INET6 ||
 355             pgsr->gsr_source.ss_family != AF_INET6)
 356                 return -EINVAL;
 357
 358         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 359         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 360
 361         if (!ipv6_addr_is_multicast(group))
 362                 return -EINVAL;
 363
 364         idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
 365         if (!idev)
 366                 return -ENODEV;
 367         dev = idev->dev;
 368
 369         err = -EADDRNOTAVAIL;
 370
 371         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 372                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 373                         continue;
 374                 if (ipv6_addr_equal(&pmc->addr, group))
 375                         break;
 376         }
 377         if (!pmc)               /* must have a prior join */
 378                 goto done;
 379         /* if a source filter was set, must be the same mode as before */
 380         if (pmc->sflist) {
 381                 if (pmc->sfmode != omode)
 382                         goto done;
 383         } else if (pmc->sfmode != omode) {
 384                 /* allow mode switches for empty-set filters */
 385                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 386                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 387                 pmc->sfmode = omode;
 388         }
 389
 390         psl = pmc->sflist;
 391         if (!add) {
 392                 if (!psl)
 393                         goto done;
 394                 rv = !0;
 395                 for (i=0; i<psl->sl_count; i++) {
 396                         rv = memcmp(&psl->sl_addr[i], source,
 397                                 sizeof(struct in6_addr));
 398                         if (rv == 0)
 399                                 break;
 400                 }
 401                 if (rv)         /* source not found */
 402                         goto done;
 403
 404                 /* update the interface filter */
 405                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 406
 407                 for (j=i+1; j<psl->sl_count; j++)
 408                         psl->sl_addr[j-1] = psl->sl_addr[j];
 409                 psl->sl_count--;
 410                 err = 0;
 411                 goto done;
 412         }
 413         /* else, add a new source to the filter */
 414
 415         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 416                 err = -ENOBUFS;
 417                 goto done;
 418         }
 419         if (!psl || psl->sl_count == psl->sl_max) {
 420                 struct ip6_sf_socklist *newpsl;
 421                 int count = IP6_SFBLOCK;
 422
 423                 if (psl)
 424                         count += psl->sl_max;
 425                 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
 426                         IP6_SFLSIZE(count), GFP_ATOMIC);
 427                 if (!newpsl) {
 428                         err = -ENOBUFS;
 429                         goto done;
 430                 }
 431                 newpsl->sl_max = count;
 432                 newpsl->sl_count = count - IP6_SFBLOCK;
 433                 if (psl) {
 434                         for (i=0; i<psl->sl_count; i++)
 435                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 436                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 437                 }
 438                 pmc->sflist = psl = newpsl;
 439         }
 440         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 441         for (i=0; i<psl->sl_count; i++) {
 442                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 443                 if (rv == 0)
 444                         break;
 445         }
 446         if (rv == 0)            /* address already there is an error */
 447                 goto done;
 448         for (j=psl->sl_count-1; j>=i; j--)
 449                 psl->sl_addr[j+1] = psl->sl_addr[j];
 450         psl->sl_addr[i] = *source;
 451         psl->sl_count++;
 452         err = 0;
 453         /* update the interface list */
 454         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 455 done:
 456         read_unlock_bh(&idev->lock);
 457         in6_dev_put(idev);
 458         dev_put(dev);
 459         return err;
 460 }
 461
 462 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 463 {
 464         struct in6_addr *group;
 465         struct ipv6_mc_socklist *pmc;
 466         struct net_device *dev;
 467         struct inet6_dev *idev;
 468         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 469         struct ip6_sf_socklist *newpsl, *psl;
 470         int i, err;
 471
 472         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 473
 474         if (!ipv6_addr_is_multicast(group))
 475                 return -EINVAL;
 476         if (gsf->gf_fmode != MCAST_INCLUDE &&
 477             gsf->gf_fmode != MCAST_EXCLUDE)
 478                 return -EINVAL;
 479
 480         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 481
 482         if (!idev)
 483                 return -ENODEV;
 484         dev = idev->dev;
 485         err = -EADDRNOTAVAIL;
 486
 487         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 488                 if (pmc->ifindex != gsf->gf_interface)
 489                         continue;
 490                 if (ipv6_addr_equal(&pmc->addr, group))
 491                         break;
 492         }
 493         if (!pmc)               /* must have a prior join */
 494                 goto done;
 495         if (gsf->gf_numsrc) {
 496                 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
 497                                 IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
 498                 if (!newpsl) {
 499                         err = -ENOBUFS;
 500                         goto done;
 501                 }
 502                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 503                 for (i=0; i<newpsl->sl_count; ++i) {
 504                         struct sockaddr_in6 *psin6;
 505
 506                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 507                         newpsl->sl_addr[i] = psin6->sin6_addr;
 508                 }
 509                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 510                         newpsl->sl_count, newpsl->sl_addr, 0);
 511                 if (err) {
 512                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 513                         goto done;
 514                 }
 515         } else
 516                 newpsl = NULL;
 517         psl = pmc->sflist;
 518         if (psl) {
 519                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 520                         psl->sl_count, psl->sl_addr, 0);
 521                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 522         } else
 523                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 524         pmc->sflist = newpsl;
 525         pmc->sfmode = gsf->gf_fmode;
 526 done:
 527         read_unlock_bh(&idev->lock);
 528         in6_dev_put(idev);
 529         dev_put(dev);
 530         return err;
 531 }
 532
 533 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 534         struct group_filter __user *optval, int __user *optlen)
 535 {
 536         int err, i, count, copycount;
 537         struct in6_addr *group;
 538         struct ipv6_mc_socklist *pmc;
 539         struct inet6_dev *idev;
 540         struct net_device *dev;
 541         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 542         struct ip6_sf_socklist *psl;
 543
 544         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 545
 546         if (!ipv6_addr_is_multicast(group))
 547                 return -EINVAL;
 548
 549         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 550
 551         if (!idev)
 552                 return -ENODEV;
 553
 554         dev = idev->dev;
 555
 556         err = -EADDRNOTAVAIL;
 557
 558         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 559                 if (pmc->ifindex != gsf->gf_interface)
 560                         continue;
 561                 if (ipv6_addr_equal(group, &pmc->addr))
 562                         break;
 563         }
 564         if (!pmc)               /* must have a prior join */
 565                 goto done;
 566         gsf->gf_fmode = pmc->sfmode;
 567         psl = pmc->sflist;
 568         count = psl ? psl->sl_count : 0;
 569         read_unlock_bh(&idev->lock);
 570         in6_dev_put(idev);
 571         dev_put(dev);
 572
 573         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 574         gsf->gf_numsrc = count;
 575         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 576             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 577                 return -EFAULT;
 578         }
 579         for (i=0; i<copycount; i++) {
 580                 struct sockaddr_in6 *psin6;
 581                 struct sockaddr_storage ss;
 582
 583                 psin6 = (struct sockaddr_in6 *)&ss;
 584                 memset(&ss, 0, sizeof(ss));
 585                 psin6->sin6_family = AF_INET6;
 586                 psin6->sin6_addr = psl->sl_addr[i];
 587                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 588                         return -EFAULT;
 589         }
 590         return 0;
 591 done:
 592         read_unlock_bh(&idev->lock);
 593         in6_dev_put(idev);
 594         dev_put(dev);
 595         return err;
 596 }
 597
 598 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
 599         struct in6_addr *src_addr)
 600 {
 601         struct ipv6_pinfo *np = inet6_sk(sk);
 602         struct ipv6_mc_socklist *mc;
 603         struct ip6_sf_socklist *psl;
 604         int rv = 1;
 605
 606         read_lock(&ipv6_sk_mc_lock);
 607         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 608                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 609                         break;
 610         }
 611         if (!mc) {
 612                 read_unlock(&ipv6_sk_mc_lock);
 613                 return 1;
 614         }
 615         psl = mc->sflist;
 616         if (!psl) {
 617                 rv = mc->sfmode == MCAST_EXCLUDE;
 618         } else {
 619                 int i;
 620
 621                 for (i=0; i<psl->sl_count; i++) {
 622                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 623                                 break;
 624                 }
 625                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 626                         rv = 0;
 627                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 628                         rv = 0;
 629         }
 630         read_unlock(&ipv6_sk_mc_lock);
 631
 632         return rv;
 633 }
 634
 635 static void ma_put(struct ifmcaddr6 *mc)
 636 {
 637         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 638                 in6_dev_put(mc->idev);
 639                 kfree(mc);
 640         }
 641 }
 642
 643 static void igmp6_group_added(struct ifmcaddr6 *mc)
 644 {
 645         struct net_device *dev = mc->idev->dev;
 646         char buf[MAX_ADDR_LEN];
 647
 648         spin_lock_bh(&mc->mca_lock);
 649         if (!(mc->mca_flags&MAF_LOADED)) {
 650                 mc->mca_flags |= MAF_LOADED;
 651                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 652                         dev_mc_add(dev, buf, dev->addr_len, 0);
 653         }
 654         spin_unlock_bh(&mc->mca_lock);
 655
 656         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 657                 return;
 658
 659         if (MLD_V1_SEEN(mc->idev)) {
 660                 igmp6_join_group(mc);
 661                 return;
 662         }
 663         /* else v2 */
 664
 665         mc->mca_crcount = mc->idev->mc_qrv;
 666         mld_ifc_event(mc->idev);
 667 }
 668
 669 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 670 {
 671         struct net_device *dev = mc->idev->dev;
 672         char buf[MAX_ADDR_LEN];
 673
 674         spin_lock_bh(&mc->mca_lock);
 675         if (mc->mca_flags&MAF_LOADED) {
 676                 mc->mca_flags &= ~MAF_LOADED;
 677                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 678                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 679         }
 680
 681         if (mc->mca_flags & MAF_NOREPORT)
 682                 goto done;
 683         spin_unlock_bh(&mc->mca_lock);
 684
 685         if (!mc->idev->dead)
 686                 igmp6_leave_group(mc);
 687
 688         spin_lock_bh(&mc->mca_lock);
 689         if (del_timer(&mc->mca_timer))
 690                 atomic_dec(&mc->mca_refcnt);
 691 done:
 692         ip6_mc_clear_src(mc);
 693         spin_unlock_bh(&mc->mca_lock);
 694 }
 695
 696 /*
 697  * deleted ifmcaddr6 manipulation
 698  */
 699 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 700 {
 701         struct ifmcaddr6 *pmc;
 702
 703         /* this is an "ifmcaddr6" for convenience; only the fields below
 704          * are actually used. In particular, the refcnt and users are not
 705          * used for management of the delete list. Using the same structure
 706          * for deleted items allows change reports to use common code with
 707          * non-deleted or query-response MCA's.
 708          */
 709         pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
 710         if (!pmc)
 711                 return;
 712         memset(pmc, 0, sizeof(*pmc));
 713         spin_lock_bh(&im->mca_lock);
 714         spin_lock_init(&pmc->mca_lock);
 715         pmc->idev = im->idev;
 716         in6_dev_hold(idev);
 717         pmc->mca_addr = im->mca_addr;
 718         pmc->mca_crcount = idev->mc_qrv;
 719         pmc->mca_sfmode = im->mca_sfmode;
 720         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 721                 struct ip6_sf_list *psf;
 722
 723                 pmc->mca_tomb = im->mca_tomb;
 724                 pmc->mca_sources = im->mca_sources;
 725                 im->mca_tomb = im->mca_sources = NULL;
 726                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 727                         psf->sf_crcount = pmc->mca_crcount;
 728         }
 729         spin_unlock_bh(&im->mca_lock);
 730
 731         write_lock_bh(&idev->mc_lock);
 732         pmc->next = idev->mc_tomb;
 733         idev->mc_tomb = pmc;
 734         write_unlock_bh(&idev->mc_lock);
 735 }
 736
 737 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 738 {
 739         struct ifmcaddr6 *pmc, *pmc_prev;
 740         struct ip6_sf_list *psf, *psf_next;
 741
 742         write_lock_bh(&idev->mc_lock);
 743         pmc_prev = NULL;
 744         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 745                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 746                         break;
 747                 pmc_prev = pmc;
 748         }
 749         if (pmc) {
 750                 if (pmc_prev)
 751                         pmc_prev->next = pmc->next;
 752                 else
 753                         idev->mc_tomb = pmc->next;
 754         }
 755         write_unlock_bh(&idev->mc_lock);
 756         if (pmc) {
 757                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 758                         psf_next = psf->sf_next;
 759                         kfree(psf);
 760                 }
 761                 in6_dev_put(pmc->idev);
 762                 kfree(pmc);
 763         }
 764 }
 765
 766 static void mld_clear_delrec(struct inet6_dev *idev)
 767 {
 768         struct ifmcaddr6 *pmc, *nextpmc;
 769
 770         write_lock_bh(&idev->mc_lock);
 771         pmc = idev->mc_tomb;
 772         idev->mc_tomb = NULL;
 773         write_unlock_bh(&idev->mc_lock);
 774
 775         for (; pmc; pmc = nextpmc) {
 776                 nextpmc = pmc->next;
 777                 ip6_mc_clear_src(pmc);
 778                 in6_dev_put(pmc->idev);
 779                 kfree(pmc);
 780         }
 781
 782         /* clear dead sources, too */
 783         read_lock_bh(&idev->lock);
 784         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 785                 struct ip6_sf_list *psf, *psf_next;
 786
 787                 spin_lock_bh(&pmc->mca_lock);
 788                 psf = pmc->mca_tomb;
 789                 pmc->mca_tomb = NULL;
 790                 spin_unlock_bh(&pmc->mca_lock);
 791                 for (; psf; psf=psf_next) {
 792                         psf_next = psf->sf_next;
 793                         kfree(psf);
 794                 }
 795         }
 796         read_unlock_bh(&idev->lock);
 797 }
 798
 799
 800 /*
 801  *      device multicast group inc (add if not found)
 802  */
 803 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
 804 {
 805         struct ifmcaddr6 *mc;
 806         struct inet6_dev *idev;
 807
 808         idev = in6_dev_get(dev);
 809
 810         if (idev == NULL)
 811                 return -EINVAL;
 812
 813         write_lock_bh(&idev->lock);
 814         if (idev->dead) {
 815                 write_unlock_bh(&idev->lock);
 816                 in6_dev_put(idev);
 817                 return -ENODEV;
 818         }
 819
 820         for (mc = idev->mc_list; mc; mc = mc->next) {
 821                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 822                         mc->mca_users++;
 823                         write_unlock_bh(&idev->lock);
 824                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 825                                 NULL, 0);
 826                         in6_dev_put(idev);
 827                         return 0;
 828                 }
 829         }
 830
 831         /*
 832          *      not found: create a new one.
 833          */
 834
 835         mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 836
 837         if (mc == NULL) {
 838                 write_unlock_bh(&idev->lock);
 839                 in6_dev_put(idev);
 840                 return -ENOMEM;
 841         }
 842
 843         memset(mc, 0, sizeof(struct ifmcaddr6));
 844         init_timer(&mc->mca_timer);
 845         mc->mca_timer.function = igmp6_timer_handler;
 846         mc->mca_timer.data = (unsigned long) mc;
 847
 848         ipv6_addr_copy(&mc->mca_addr, addr);
 849         mc->idev = idev;
 850         mc->mca_users = 1;
 851         /* mca_stamp should be updated upon changes */
 852         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 853         atomic_set(&mc->mca_refcnt, 2);
 854         spin_lock_init(&mc->mca_lock);
 855
 856         /* initial mode is (EX, empty) */
 857         mc->mca_sfmode = MCAST_EXCLUDE;
 858         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 859
 860         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 861             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 862                 mc->mca_flags |= MAF_NOREPORT;
 863
 864         mc->next = idev->mc_list;
 865         idev->mc_list = mc;
 866         write_unlock_bh(&idev->lock);
 867
 868         mld_del_delrec(idev, &mc->mca_addr);
 869         igmp6_group_added(mc);
 870         ma_put(mc);
 871         return 0;
 872 }
 873
 874 /*
 875  *      device multicast group del
 876  */
 877 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
 878 {
 879         struct ifmcaddr6 *ma, **map;
 880
 881         write_lock_bh(&idev->lock);
 882         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 883                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 884                         if (--ma->mca_users == 0) {
 885                                 *map = ma->next;
 886                                 write_unlock_bh(&idev->lock);
 887
 888                                 igmp6_group_dropped(ma);
 889
 890                                 ma_put(ma);
 891                                 return 0;
 892                         }
 893                         write_unlock_bh(&idev->lock);
 894                         return 0;
 895                 }
 896         }
 897         write_unlock_bh(&idev->lock);
 898
 899         return -ENOENT;
 900 }
 901
 902 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
 903 {
 904         struct inet6_dev *idev = in6_dev_get(dev);
 905         int err;
 906
 907         if (!idev)
 908                 return -ENODEV;
 909
 910         err = __ipv6_dev_mc_dec(idev, addr);
 911
 912         in6_dev_put(idev);
 913
 914         return err;
 915 }
 916
 917 /*
 918  * identify MLD packets for MLD filter exceptions
 919  */
 920 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 921 {
 922         struct icmp6hdr *pic;
 923
 924         if (nexthdr != IPPROTO_ICMPV6)
 925                 return 0;
 926
 927         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 928                 return 0;
 929
 930         pic = (struct icmp6hdr *)skb->h.raw;
 931
 932         switch (pic->icmp6_type) {
 933         case ICMPV6_MGM_QUERY:
 934         case ICMPV6_MGM_REPORT:
 935         case ICMPV6_MGM_REDUCTION:
 936         case ICMPV6_MLD2_REPORT:
 937                 return 1;
 938         default:
 939                 break;
 940         }
 941         return 0;
 942 }
 943
 944 /*
 945  *      check if the interface/address pair is valid
 946  */
 947 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
 948         struct in6_addr *src_addr)
 949 {
 950         struct inet6_dev *idev;
 951         struct ifmcaddr6 *mc;
 952         int rv = 0;
 953
 954         idev = in6_dev_get(dev);
 955         if (idev) {
 956                 read_lock_bh(&idev->lock);
 957                 for (mc = idev->mc_list; mc; mc=mc->next) {
 958                         if (ipv6_addr_equal(&mc->mca_addr, group))
 959                                 break;
 960                 }
 961                 if (mc) {
 962                         if (src_addr && !ipv6_addr_any(src_addr)) {
 963                                 struct ip6_sf_list *psf;
 964
 965                                 spin_lock_bh(&mc->mca_lock);
 966                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 967                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 968                                                 break;
 969                                 }
 970                                 if (psf)
 971                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 972                                                 psf->sf_count[MCAST_EXCLUDE] !=
 973                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 974                                 else
 975                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 976                                 spin_unlock_bh(&mc->mca_lock);
 977                         } else
 978                                 rv = 1; /* don't filter unspecified source */
 979                 }
 980                 read_unlock_bh(&idev->lock);
 981                 in6_dev_put(idev);
 982         }
 983         return rv;
 984 }
 985
 986 static void mld_gq_start_timer(struct inet6_dev *idev)
 987 {
 988         int tv = net_random() % idev->mc_maxdelay;
 989
 990         idev->mc_gq_running = 1;
 991         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
 992                 in6_dev_hold(idev);
 993 }
 994
 995 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
 996 {
 997         int tv = net_random() % delay;
 998
 999         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1000                 in6_dev_hold(idev);
1001 }
1002
1003 /*
1004  *      IGMP handling (alias multicast ICMPv6 messages)
1005  */
1006
1007 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1008 {
1009         unsigned long delay = resptime;
1010
1011         /* Do not start timer for these addresses */
1012         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1013             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1014                 return;
1015
1016         if (del_timer(&ma->mca_timer)) {
1017                 atomic_dec(&ma->mca_refcnt);
1018                 delay = ma->mca_timer.expires - jiffies;
1019         }
1020
1021         if (delay >= resptime) {
1022                 if (resptime)
1023                         delay = net_random() % resptime;
1024                 else
1025                         delay = 1;
1026         }
1027         ma->mca_timer.expires = jiffies + delay;
1028         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1029                 atomic_inc(&ma->mca_refcnt);
1030         ma->mca_flags |= MAF_TIMER_RUNNING;
1031 }
1032
1033 static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1034         struct in6_addr *srcs)
1035 {
1036         struct ip6_sf_list *psf;
1037         int i, scount;
1038
1039         scount = 0;
1040         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1041                 if (scount == nsrcs)
1042                         break;
1043                 for (i=0; i<nsrcs; i++)
1044                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1045                                 psf->sf_gsresp = 1;
1046                                 scount++;
1047                                 break;
1048                         }
1049         }
1050 }
1051
1052 int igmp6_event_query(struct sk_buff *skb)
1053 {
1054         struct mld2_query *mlh2 = (struct mld2_query *) skb->h.raw;
1055         struct ifmcaddr6 *ma;
1056         struct in6_addr *group;
1057         unsigned long max_delay;
1058         struct inet6_dev *idev;
1059         struct icmp6hdr *hdr;
1060         int group_type;
1061         int mark = 0;
1062         int len;
1063
1064         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1065                 return -EINVAL;
1066
1067         /* compute payload length excluding extension headers */
1068         len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1069         len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1070
1071         /* Drop queries with not link local source */
1072         if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1073                 return -EINVAL;
1074
1075         idev = in6_dev_get(skb->dev);
1076
1077         if (idev == NULL)
1078                 return 0;
1079
1080         hdr = (struct icmp6hdr *) skb->h.raw;
1081         group = (struct in6_addr *) (hdr + 1);
1082         group_type = ipv6_addr_type(group);
1083
1084         if (group_type != IPV6_ADDR_ANY &&
1085             !(group_type&IPV6_ADDR_MULTICAST)) {
1086                 in6_dev_put(idev);
1087                 return -EINVAL;
1088         }
1089
1090         if (len == 24) {
1091                 int switchback;
1092                 /* MLDv1 router present */
1093
1094                 /* Translate milliseconds to jiffies */
1095                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1096
1097                 switchback = (idev->mc_qrv + 1) * max_delay;
1098                 idev->mc_v1_seen = jiffies + switchback;
1099
1100                 /* cancel the interface change timer */
1101                 idev->mc_ifc_count = 0;
1102                 if (del_timer(&idev->mc_ifc_timer))
1103                         __in6_dev_put(idev);
1104                 /* clear deleted report items */
1105                 mld_clear_delrec(idev);
1106         } else if (len >= 28) {
1107                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1108                 if (!max_delay)
1109                         max_delay = 1;
1110                 idev->mc_maxdelay = max_delay;
1111                 if (mlh2->qrv)
1112                         idev->mc_qrv = mlh2->qrv;
1113                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1114                         if (mlh2->nsrcs) {
1115                                 in6_dev_put(idev);
1116                                 return -EINVAL; /* no sources allowed */
1117                         }
1118                         mld_gq_start_timer(idev);
1119                         in6_dev_put(idev);
1120                         return 0;
1121                 }
1122                 /* mark sources to include, if group & source-specific */
1123                 mark = mlh2->nsrcs != 0;
1124         } else {
1125                 in6_dev_put(idev);
1126                 return -EINVAL;
1127         }
1128
1129         read_lock_bh(&idev->lock);
1130         if (group_type == IPV6_ADDR_ANY) {
1131                 for (ma = idev->mc_list; ma; ma=ma->next) {
1132                         spin_lock_bh(&ma->mca_lock);
1133                         igmp6_group_queried(ma, max_delay);
1134                         spin_unlock_bh(&ma->mca_lock);
1135                 }
1136         } else {
1137                 for (ma = idev->mc_list; ma; ma=ma->next) {
1138                         if (group_type != IPV6_ADDR_ANY &&
1139                             !ipv6_addr_equal(group, &ma->mca_addr))
1140                                 continue;
1141                         spin_lock_bh(&ma->mca_lock);
1142                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1143                                 /* gsquery <- gsquery && mark */
1144                                 if (!mark)
1145                                         ma->mca_flags &= ~MAF_GSQUERY;
1146                         } else {
1147                                 /* gsquery <- mark */
1148                                 if (mark)
1149                                         ma->mca_flags |= MAF_GSQUERY;
1150                                 else
1151                                         ma->mca_flags &= ~MAF_GSQUERY;
1152                         }
1153                         if (ma->mca_flags & MAF_GSQUERY)
1154                                 mld_marksources(ma, ntohs(mlh2->nsrcs),
1155                                         mlh2->srcs);
1156                         igmp6_group_queried(ma, max_delay);
1157                         spin_unlock_bh(&ma->mca_lock);
1158                         if (group_type != IPV6_ADDR_ANY)
1159                                 break;
1160                 }
1161         }
1162         read_unlock_bh(&idev->lock);
1163         in6_dev_put(idev);
1164
1165         return 0;
1166 }
1167
1168
1169 int igmp6_event_report(struct sk_buff *skb)
1170 {
1171         struct ifmcaddr6 *ma;
1172         struct in6_addr *addrp;
1173         struct inet6_dev *idev;
1174         struct icmp6hdr *hdr;
1175         int addr_type;
1176
1177         /* Our own report looped back. Ignore it. */
1178         if (skb->pkt_type == PACKET_LOOPBACK)
1179                 return 0;
1180
1181         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1182                 return -EINVAL;
1183
1184         hdr = (struct icmp6hdr*) skb->h.raw;
1185
1186         /* Drop reports with not link local source */
1187         addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1188         if (addr_type != IPV6_ADDR_ANY &&
1189             !(addr_type&IPV6_ADDR_LINKLOCAL))
1190                 return -EINVAL;
1191
1192         addrp = (struct in6_addr *) (hdr + 1);
1193
1194         idev = in6_dev_get(skb->dev);
1195         if (idev == NULL)
1196                 return -ENODEV;
1197
1198         /*
1199          *      Cancel the timer for this group
1200          */
1201
1202         read_lock_bh(&idev->lock);
1203         for (ma = idev->mc_list; ma; ma=ma->next) {
1204                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1205                         spin_lock(&ma->mca_lock);
1206                         if (del_timer(&ma->mca_timer))
1207                                 atomic_dec(&ma->mca_refcnt);
1208                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1209                         spin_unlock(&ma->mca_lock);
1210                         break;
1211                 }
1212         }
1213         read_unlock_bh(&idev->lock);
1214         in6_dev_put(idev);
1215         return 0;
1216 }
1217
1218 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1219         int gdeleted, int sdeleted)
1220 {
1221         switch (type) {
1222         case MLD2_MODE_IS_INCLUDE:
1223         case MLD2_MODE_IS_EXCLUDE:
1224                 if (gdeleted || sdeleted)
1225                         return 0;
1226                 return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
1227         case MLD2_CHANGE_TO_INCLUDE:
1228                 if (gdeleted || sdeleted)
1229                         return 0;
1230                 return psf->sf_count[MCAST_INCLUDE] != 0;
1231         case MLD2_CHANGE_TO_EXCLUDE:
1232                 if (gdeleted || sdeleted)
1233                         return 0;
1234                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1235                     psf->sf_count[MCAST_INCLUDE])
1236                         return 0;
1237                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1238                         psf->sf_count[MCAST_EXCLUDE];
1239         case MLD2_ALLOW_NEW_SOURCES:
1240                 if (gdeleted || !psf->sf_crcount)
1241                         return 0;
1242                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1243         case MLD2_BLOCK_OLD_SOURCES:
1244                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1245                         return gdeleted || (psf->sf_crcount && sdeleted);
1246                 return psf->sf_crcount && !gdeleted && !sdeleted;
1247         }
1248         return 0;
1249 }
1250
1251 static int
1252 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1253 {
1254         struct ip6_sf_list *psf;
1255         int scount = 0;
1256
1257         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1258                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1259                         continue;
1260                 scount++;
1261         }
1262         return scount;
1263 }
1264
1265 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1266 {
1267         struct sock *sk = igmp6_socket->sk;
1268         struct sk_buff *skb;
1269         struct mld2_report *pmr;
1270         struct in6_addr addr_buf;
1271         int err;
1272         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1273                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1274                      IPV6_TLV_PADN, 0 };
1275
1276         /* we assume size > sizeof(ra) here */
1277         skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1278
1279         if (skb == 0)
1280                 return NULL;
1281
1282         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1283         if (dev->hard_header) {
1284                 unsigned char ha[MAX_ADDR_LEN];
1285
1286                 ndisc_mc_map(&mld2_all_mcr, ha, dev, 1);
1287                 if (dev->hard_header(skb, dev, ETH_P_IPV6,ha,NULL,size) < 0) {
1288                         kfree_skb(skb);
1289                         return NULL;
1290                 }
1291         }
1292
1293         if (ipv6_get_lladdr(dev, &addr_buf)) {
1294                 /* <draft-ietf-magma-mld-source-05.txt>:
1295                  * use unspecified address as the source address
1296                  * when a valid link-local address is not available.
1297                  */
1298                 memset(&addr_buf, 0, sizeof(addr_buf));
1299         }
1300
1301         ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1302
1303         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1304
1305         pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1306         skb->h.raw = (unsigned char *)pmr;
1307         pmr->type = ICMPV6_MLD2_REPORT;
1308         pmr->resv1 = 0;
1309         pmr->csum = 0;
1310         pmr->resv2 = 0;
1311         pmr->ngrec = 0;
1312         return skb;
1313 }
1314
1315 static void mld_sendpack(struct sk_buff *skb)
1316 {
1317         struct ipv6hdr *pip6 = skb->nh.ipv6h;
1318         struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1319         int payload_len, mldlen;
1320         struct inet6_dev *idev = in6_dev_get(skb->dev);
1321         int err;
1322
1323         IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1324         payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1325                 sizeof(struct ipv6hdr);
1326         mldlen = skb->tail - skb->h.raw;
1327         pip6->payload_len = htons(payload_len);
1328
1329         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1330                 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1331         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1332                 dev_queue_xmit);
1333         if (!err) {
1334                 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1335                 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1336         } else
1337                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1338
1339         if (likely(idev != NULL))
1340                 in6_dev_put(idev);
1341 }
1342
1343 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1344 {
1345         return sizeof(struct mld2_grec) + 4*mld_scount(pmc,type,gdel,sdel);
1346 }
1347
1348 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1349         int type, struct mld2_grec **ppgr)
1350 {
1351         struct net_device *dev = pmc->idev->dev;
1352         struct mld2_report *pmr;
1353         struct mld2_grec *pgr;
1354
1355         if (!skb)
1356                 skb = mld_newpack(dev, dev->mtu);
1357         if (!skb)
1358                 return NULL;
1359         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1360         pgr->grec_type = type;
1361         pgr->grec_auxwords = 0;
1362         pgr->grec_nsrcs = 0;
1363         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1364         pmr = (struct mld2_report *)skb->h.raw;
1365         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1366         *ppgr = pgr;
1367         return skb;
1368 }
1369
1370 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1371         skb_tailroom(skb)) : 0)
1372
1373 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1374         int type, int gdeleted, int sdeleted)
1375 {
1376         struct net_device *dev = pmc->idev->dev;
1377         struct mld2_report *pmr;
1378         struct mld2_grec *pgr = NULL;
1379         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1380         int scount, first, isquery, truncate;
1381
1382         if (pmc->mca_flags & MAF_NOREPORT)
1383                 return skb;
1384
1385         isquery = type == MLD2_MODE_IS_INCLUDE ||
1386                   type == MLD2_MODE_IS_EXCLUDE;
1387         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1388                     type == MLD2_CHANGE_TO_EXCLUDE;
1389
1390         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1391
1392         if (!*psf_list) {
1393                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1394                     type == MLD2_BLOCK_OLD_SOURCES)
1395                         return skb;
1396                 if (pmc->mca_crcount || isquery) {
1397                         /* make sure we have room for group header and at
1398                          * least one source.
1399                          */
1400                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
1401                             sizeof(struct in6_addr)) {
1402                                 mld_sendpack(skb);
1403                                 skb = NULL; /* add_grhead will get a new one */
1404                         }
1405                         skb = add_grhead(skb, pmc, type, &pgr);
1406                 }
1407                 return skb;
1408         }
1409         pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1410
1411         /* EX and TO_EX get a fresh packet, if needed */
1412         if (truncate) {
1413                 if (pmr && pmr->ngrec &&
1414                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1415                         if (skb)
1416                                 mld_sendpack(skb);
1417                         skb = mld_newpack(dev, dev->mtu);
1418                 }
1419         }
1420         first = 1;
1421         scount = 0;
1422         psf_prev = NULL;
1423         for (psf=*psf_list; psf; psf=psf_next) {
1424                 struct in6_addr *psrc;
1425
1426                 psf_next = psf->sf_next;
1427
1428                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1429                         psf_prev = psf;
1430                         continue;
1431                 }
1432
1433                 /* clear marks on query responses */
1434                 if (isquery)
1435                         psf->sf_gsresp = 0;
1436
1437                 if (AVAILABLE(skb) < sizeof(*psrc) +
1438                     first*sizeof(struct mld2_grec)) {
1439                         if (truncate && !first)
1440                                 break;   /* truncate these */
1441                         if (pgr)
1442                                 pgr->grec_nsrcs = htons(scount);
1443                         if (skb)
1444                                 mld_sendpack(skb);
1445                         skb = mld_newpack(dev, dev->mtu);
1446                         first = 1;
1447                         scount = 0;
1448                 }
1449                 if (first) {
1450                         skb = add_grhead(skb, pmc, type, &pgr);
1451                         first = 0;
1452                 }
1453                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1454                 *psrc = psf->sf_addr;
1455                 scount++;
1456                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1457                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1458                         psf->sf_crcount--;
1459                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1460                                 if (psf_prev)
1461                                         psf_prev->sf_next = psf->sf_next;
1462                                 else
1463                                         *psf_list = psf->sf_next;
1464                                 kfree(psf);
1465                                 continue;
1466                         }
1467                 }
1468                 psf_prev = psf;
1469         }
1470         if (pgr)
1471                 pgr->grec_nsrcs = htons(scount);
1472
1473         if (isquery)
1474                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1475         return skb;
1476 }
1477
1478 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1479 {
1480         struct sk_buff *skb = NULL;
1481         int type;
1482
1483         if (!pmc) {
1484                 read_lock_bh(&idev->lock);
1485                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1486                         if (pmc->mca_flags & MAF_NOREPORT)
1487                                 continue;
1488                         spin_lock_bh(&pmc->mca_lock);
1489                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1490                                 type = MLD2_MODE_IS_EXCLUDE;
1491                         else
1492                                 type = MLD2_MODE_IS_INCLUDE;
1493                         skb = add_grec(skb, pmc, type, 0, 0);
1494                         spin_unlock_bh(&pmc->mca_lock);
1495                 }
1496                 read_unlock_bh(&idev->lock);
1497         } else {
1498                 spin_lock_bh(&pmc->mca_lock);
1499                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1500                         type = MLD2_MODE_IS_EXCLUDE;
1501                 else
1502                         type = MLD2_MODE_IS_INCLUDE;
1503                 skb = add_grec(skb, pmc, type, 0, 0);
1504                 spin_unlock_bh(&pmc->mca_lock);
1505         }
1506         if (skb)
1507                 mld_sendpack(skb);
1508 }
1509
1510 /*
1511  * remove zero-count source records from a source filter list
1512  */
1513 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1514 {
1515         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1516
1517         psf_prev = NULL;
1518         for (psf=*ppsf; psf; psf = psf_next) {
1519                 psf_next = psf->sf_next;
1520                 if (psf->sf_crcount == 0) {
1521                         if (psf_prev)
1522                                 psf_prev->sf_next = psf->sf_next;
1523                         else
1524                                 *ppsf = psf->sf_next;
1525                         kfree(psf);
1526                 } else
1527                         psf_prev = psf;
1528         }
1529 }
1530
1531 static void mld_send_cr(struct inet6_dev *idev)
1532 {
1533         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1534         struct sk_buff *skb = NULL;
1535         int type, dtype;
1536
1537         read_lock_bh(&idev->lock);
1538         write_lock_bh(&idev->mc_lock);
1539
1540         /* deleted MCA's */
1541         pmc_prev = NULL;
1542         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1543                 pmc_next = pmc->next;
1544                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1545                         type = MLD2_BLOCK_OLD_SOURCES;
1546                         dtype = MLD2_BLOCK_OLD_SOURCES;
1547                         skb = add_grec(skb, pmc, type, 1, 0);
1548                         skb = add_grec(skb, pmc, dtype, 1, 1);
1549                 }
1550                 if (pmc->mca_crcount) {
1551                         pmc->mca_crcount--;
1552                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1553                                 type = MLD2_CHANGE_TO_INCLUDE;
1554                                 skb = add_grec(skb, pmc, type, 1, 0);
1555                         }
1556                         if (pmc->mca_crcount == 0) {
1557                                 mld_clear_zeros(&pmc->mca_tomb);
1558                                 mld_clear_zeros(&pmc->mca_sources);
1559                         }
1560                 }
1561                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1562                     !pmc->mca_sources) {
1563                         if (pmc_prev)
1564                                 pmc_prev->next = pmc_next;
1565                         else
1566                                 idev->mc_tomb = pmc_next;
1567                         in6_dev_put(pmc->idev);
1568                         kfree(pmc);
1569                 } else
1570                         pmc_prev = pmc;
1571         }
1572         write_unlock_bh(&idev->mc_lock);
1573
1574         /* change recs */
1575         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1576                 spin_lock_bh(&pmc->mca_lock);
1577                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1578                         type = MLD2_BLOCK_OLD_SOURCES;
1579                         dtype = MLD2_ALLOW_NEW_SOURCES;
1580                 } else {
1581                         type = MLD2_ALLOW_NEW_SOURCES;
1582                         dtype = MLD2_BLOCK_OLD_SOURCES;
1583                 }
1584                 skb = add_grec(skb, pmc, type, 0, 0);
1585                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1586
1587                 /* filter mode changes */
1588                 if (pmc->mca_crcount) {
1589                         pmc->mca_crcount--;
1590                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1591                                 type = MLD2_CHANGE_TO_EXCLUDE;
1592                         else
1593                                 type = MLD2_CHANGE_TO_INCLUDE;
1594                         skb = add_grec(skb, pmc, type, 0, 0);
1595                 }
1596                 spin_unlock_bh(&pmc->mca_lock);
1597         }
1598         read_unlock_bh(&idev->lock);
1599         if (!skb)
1600                 return;
1601         (void) mld_sendpack(skb);
1602 }
1603
1604 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1605 {
1606         struct sock *sk = igmp6_socket->sk;
1607         struct inet6_dev *idev;
1608         struct sk_buff *skb;
1609         struct icmp6hdr *hdr;
1610         struct in6_addr *snd_addr;
1611         struct in6_addr *addrp;
1612         struct in6_addr addr_buf;
1613         struct in6_addr all_routers;
1614         int err, len, payload_len, full_len;
1615         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1616                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1617                      IPV6_TLV_PADN, 0 };
1618
1619         IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1620         snd_addr = addr;
1621         if (type == ICMPV6_MGM_REDUCTION) {
1622                 snd_addr = &all_routers;
1623                 ipv6_addr_all_routers(&all_routers);
1624         }
1625
1626         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1627         payload_len = len + sizeof(ra);
1628         full_len = sizeof(struct ipv6hdr) + payload_len;
1629
1630         skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1631
1632         if (skb == NULL) {
1633                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1634                 return;
1635         }
1636
1637         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1638         if (dev->hard_header) {
1639                 unsigned char ha[MAX_ADDR_LEN];
1640                 ndisc_mc_map(snd_addr, ha, dev, 1);
1641                 if (dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, full_len) < 0)
1642                         goto out;
1643         }
1644
1645         if (ipv6_get_lladdr(dev, &addr_buf)) {
1646                 /* <draft-ietf-magma-mld-source-05.txt>:
1647                  * use unspecified address as the source address
1648                  * when a valid link-local address is not available.
1649                  */
1650                 memset(&addr_buf, 0, sizeof(addr_buf));
1651         }
1652
1653         ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1654
1655         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1656
1657         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1658         memset(hdr, 0, sizeof(struct icmp6hdr));
1659         hdr->icmp6_type = type;
1660
1661         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1662         ipv6_addr_copy(addrp, addr);
1663
1664         hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1665                                            IPPROTO_ICMPV6,
1666                                            csum_partial((__u8 *) hdr, len, 0));
1667
1668         idev = in6_dev_get(skb->dev);
1669
1670         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1671                 dev_queue_xmit);
1672         if (!err) {
1673                 if (type == ICMPV6_MGM_REDUCTION)
1674                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1675                 else
1676                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1677                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1678                 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1679         } else
1680                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1681
1682         if (likely(idev != NULL))
1683                 in6_dev_put(idev);
1684         return;
1685
1686 out:
1687         IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1688         kfree_skb(skb);
1689 }
1690
1691 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1692         struct in6_addr *psfsrc)
1693 {
1694         struct ip6_sf_list *psf, *psf_prev;
1695         int rv = 0;
1696
1697         psf_prev = NULL;
1698         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1699                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1700                         break;
1701                 psf_prev = psf;
1702         }
1703         if (!psf || psf->sf_count[sfmode] == 0) {
1704                 /* source filter not found, or count wrong =>  bug */
1705                 return -ESRCH;
1706         }
1707         psf->sf_count[sfmode]--;
1708         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1709                 struct inet6_dev *idev = pmc->idev;
1710
1711                 /* no more filters for this source */
1712                 if (psf_prev)
1713                         psf_prev->sf_next = psf->sf_next;
1714                 else
1715                         pmc->mca_sources = psf->sf_next;
1716                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1717                     !MLD_V1_SEEN(idev)) {
1718                         psf->sf_crcount = idev->mc_qrv;
1719                         psf->sf_next = pmc->mca_tomb;
1720                         pmc->mca_tomb = psf;
1721                         rv = 1;
1722                 } else
1723                         kfree(psf);
1724         }
1725         return rv;
1726 }
1727
1728 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1729                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1730                           int delta)
1731 {
1732         struct ifmcaddr6 *pmc;
1733         int     changerec = 0;
1734         int     i, err;
1735
1736         if (!idev)
1737                 return -ENODEV;
1738         read_lock_bh(&idev->lock);
1739         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1740                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1741                         break;
1742         }
1743         if (!pmc) {
1744                 /* MCA not found?? bug */
1745                 read_unlock_bh(&idev->lock);
1746                 return -ESRCH;
1747         }
1748         spin_lock_bh(&pmc->mca_lock);
1749         sf_markstate(pmc);
1750         if (!delta) {
1751                 if (!pmc->mca_sfcount[sfmode]) {
1752                         spin_unlock_bh(&pmc->mca_lock);
1753                         read_unlock_bh(&idev->lock);
1754                         return -EINVAL;
1755                 }
1756                 pmc->mca_sfcount[sfmode]--;
1757         }
1758         err = 0;
1759         for (i=0; i<sfcount; i++) {
1760                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1761
1762                 changerec |= rv > 0;
1763                 if (!err && rv < 0)
1764                         err = rv;
1765         }
1766         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1767             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1768             pmc->mca_sfcount[MCAST_INCLUDE]) {
1769                 struct ip6_sf_list *psf;
1770
1771                 /* filter mode change */
1772                 pmc->mca_sfmode = MCAST_INCLUDE;
1773                 pmc->mca_crcount = idev->mc_qrv;
1774                 idev->mc_ifc_count = pmc->mca_crcount;
1775                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1776                         psf->sf_crcount = 0;
1777                 mld_ifc_event(pmc->idev);
1778         } else if (sf_setstate(pmc) || changerec)
1779                 mld_ifc_event(pmc->idev);
1780         spin_unlock_bh(&pmc->mca_lock);
1781         read_unlock_bh(&idev->lock);
1782         return err;
1783 }
1784
1785 /*
1786  * Add multicast single-source filter to the interface list
1787  */
1788 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1789         struct in6_addr *psfsrc, int delta)
1790 {
1791         struct ip6_sf_list *psf, *psf_prev;
1792
1793         psf_prev = NULL;
1794         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1795                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1796                         break;
1797                 psf_prev = psf;
1798         }
1799         if (!psf) {
1800                 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1801                 if (!psf)
1802                         return -ENOBUFS;
1803                 memset(psf, 0, sizeof(*psf));
1804                 psf->sf_addr = *psfsrc;
1805                 if (psf_prev) {
1806                         psf_prev->sf_next = psf;
1807                 } else
1808                         pmc->mca_sources = psf;
1809         }
1810         psf->sf_count[sfmode]++;
1811         return 0;
1812 }
1813
1814 static void sf_markstate(struct ifmcaddr6 *pmc)
1815 {
1816         struct ip6_sf_list *psf;
1817         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1818
1819         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1820                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1821                         psf->sf_oldin = mca_xcount ==
1822                                 psf->sf_count[MCAST_EXCLUDE] &&
1823                                 !psf->sf_count[MCAST_INCLUDE];
1824                 } else
1825                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1826 }
1827
1828 static int sf_setstate(struct ifmcaddr6 *pmc)
1829 {
1830         struct ip6_sf_list *psf;
1831         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1832         int qrv = pmc->idev->mc_qrv;
1833         int new_in, rv;
1834
1835         rv = 0;
1836         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1837                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1838                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1839                                 !psf->sf_count[MCAST_INCLUDE];
1840                 } else
1841                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1842                 if (new_in != psf->sf_oldin) {
1843                         psf->sf_crcount = qrv;
1844                         rv++;
1845                 }
1846         }
1847         return rv;
1848 }
1849
1850 /*
1851  * Add multicast source filter list to the interface list
1852  */
1853 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
1854                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1855                           int delta)
1856 {
1857         struct ifmcaddr6 *pmc;
1858         int     isexclude;
1859         int     i, err;
1860
1861         if (!idev)
1862                 return -ENODEV;
1863         read_lock_bh(&idev->lock);
1864         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1865                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1866                         break;
1867         }
1868         if (!pmc) {
1869                 /* MCA not found?? bug */
1870                 read_unlock_bh(&idev->lock);
1871                 return -ESRCH;
1872         }
1873         spin_lock_bh(&pmc->mca_lock);
1874
1875         sf_markstate(pmc);
1876         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
1877         if (!delta)
1878                 pmc->mca_sfcount[sfmode]++;
1879         err = 0;
1880         for (i=0; i<sfcount; i++) {
1881                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1882                 if (err)
1883                         break;
1884         }
1885         if (err) {
1886                 int j;
1887
1888                 if (!delta)
1889                         pmc->mca_sfcount[sfmode]--;
1890                 for (j=0; j<i; j++)
1891                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1892         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1893                 struct inet6_dev *idev = pmc->idev;
1894                 struct ip6_sf_list *psf;
1895
1896                 /* filter mode change */
1897                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1898                         pmc->mca_sfmode = MCAST_EXCLUDE;
1899                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
1900                         pmc->mca_sfmode = MCAST_INCLUDE;
1901                 /* else no filters; keep old mode for reports */
1902
1903                 pmc->mca_crcount = idev->mc_qrv;
1904                 idev->mc_ifc_count = pmc->mca_crcount;
1905                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1906                         psf->sf_crcount = 0;
1907                 mld_ifc_event(idev);
1908         } else if (sf_setstate(pmc))
1909                 mld_ifc_event(idev);
1910         spin_unlock_bh(&pmc->mca_lock);
1911         read_unlock_bh(&idev->lock);
1912         return err;
1913 }
1914
1915 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
1916 {
1917         struct ip6_sf_list *psf, *nextpsf;
1918
1919         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
1920                 nextpsf = psf->sf_next;
1921                 kfree(psf);
1922         }
1923         pmc->mca_tomb = NULL;
1924         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
1925                 nextpsf = psf->sf_next;
1926                 kfree(psf);
1927         }
1928         pmc->mca_sources = NULL;
1929         pmc->mca_sfmode = MCAST_EXCLUDE;
1930         pmc->mca_sfcount[MCAST_EXCLUDE] = 0;
1931         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
1932 }
1933
1934
1935 static void igmp6_join_group(struct ifmcaddr6 *ma)
1936 {
1937         unsigned long delay;
1938
1939         if (ma->mca_flags & MAF_NOREPORT)
1940                 return;
1941
1942         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
1943
1944         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
1945
1946         spin_lock_bh(&ma->mca_lock);
1947         if (del_timer(&ma->mca_timer)) {
1948                 atomic_dec(&ma->mca_refcnt);
1949                 delay = ma->mca_timer.expires - jiffies;
1950         }
1951
1952         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1953                 atomic_inc(&ma->mca_refcnt);
1954         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
1955         spin_unlock_bh(&ma->mca_lock);
1956 }
1957
1958 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
1959                             struct inet6_dev *idev)
1960 {
1961         int err;
1962
1963         if (iml->sflist == 0) {
1964                 /* any-source empty exclude case */
1965                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
1966         }
1967         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
1968                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
1969         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
1970         iml->sflist = NULL;
1971         return err;
1972 }
1973
1974 static void igmp6_leave_group(struct ifmcaddr6 *ma)
1975 {
1976         if (MLD_V1_SEEN(ma->idev)) {
1977                 if (ma->mca_flags & MAF_LAST_REPORTER)
1978                         igmp6_send(&ma->mca_addr, ma->idev->dev,
1979                                 ICMPV6_MGM_REDUCTION);
1980         } else {
1981                 mld_add_delrec(ma->idev, ma);
1982                 mld_ifc_event(ma->idev);
1983         }
1984 }
1985
1986 static void mld_gq_timer_expire(unsigned long data)
1987 {
1988         struct inet6_dev *idev = (struct inet6_dev *)data;
1989
1990         idev->mc_gq_running = 0;
1991         mld_send_report(idev, NULL);
1992         __in6_dev_put(idev);
1993 }
1994
1995 static void mld_ifc_timer_expire(unsigned long data)
1996 {
1997         struct inet6_dev *idev = (struct inet6_dev *)data;
1998
1999         mld_send_cr(idev);
2000         if (idev->mc_ifc_count) {
2001                 idev->mc_ifc_count--;
2002                 if (idev->mc_ifc_count)
2003                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2004         }
2005         __in6_dev_put(idev);
2006 }
2007
2008 static void mld_ifc_event(struct inet6_dev *idev)
2009 {
2010         if (MLD_V1_SEEN(idev))
2011                 return;
2012         idev->mc_ifc_count = idev->mc_qrv;
2013         mld_ifc_start_timer(idev, 1);
2014 }
2015
2016
2017 static void igmp6_timer_handler(unsigned long data)
2018 {
2019         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2020
2021         if (MLD_V1_SEEN(ma->idev))
2022                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2023         else
2024                 mld_send_report(ma->idev, ma);
2025
2026         spin_lock(&ma->mca_lock);
2027         ma->mca_flags |=  MAF_LAST_REPORTER;
2028         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2029         spin_unlock(&ma->mca_lock);
2030         ma_put(ma);
2031 }
2032
2033 /* Device going down */
2034
2035 void ipv6_mc_down(struct inet6_dev *idev)
2036 {
2037         struct ifmcaddr6 *i;
2038
2039         /* Withdraw multicast list */
2040
2041         read_lock_bh(&idev->lock);
2042         idev->mc_ifc_count = 0;
2043         if (del_timer(&idev->mc_ifc_timer))
2044                 __in6_dev_put(idev);
2045         idev->mc_gq_running = 0;
2046         if (del_timer(&idev->mc_gq_timer))
2047                 __in6_dev_put(idev);
2048
2049         for (i = idev->mc_list; i; i=i->next)
2050                 igmp6_group_dropped(i);
2051         read_unlock_bh(&idev->lock);
2052
2053         mld_clear_delrec(idev);
2054 }
2055
2056
2057 /* Device going up */
2058
2059 void ipv6_mc_up(struct inet6_dev *idev)
2060 {
2061         struct ifmcaddr6 *i;
2062
2063         /* Install multicast list, except for all-nodes (already installed) */
2064
2065         read_lock_bh(&idev->lock);
2066         for (i = idev->mc_list; i; i=i->next)
2067                 igmp6_group_added(i);
2068         read_unlock_bh(&idev->lock);
2069 }
2070
2071 /* IPv6 device initialization. */
2072
2073 void ipv6_mc_init_dev(struct inet6_dev *idev)
2074 {
2075         struct in6_addr maddr;
2076
2077         write_lock_bh(&idev->lock);
2078         rwlock_init(&idev->mc_lock);
2079         idev->mc_gq_running = 0;
2080         init_timer(&idev->mc_gq_timer);
2081         idev->mc_gq_timer.data = (unsigned long) idev;
2082         idev->mc_gq_timer.function = &mld_gq_timer_expire;
2083         idev->mc_tomb = NULL;
2084         idev->mc_ifc_count = 0;
2085         init_timer(&idev->mc_ifc_timer);
2086         idev->mc_ifc_timer.data = (unsigned long) idev;
2087         idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2088         idev->mc_qrv = MLD_QRV_DEFAULT;
2089         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2090         idev->mc_v1_seen = 0;
2091         write_unlock_bh(&idev->lock);
2092
2093         /* Add all-nodes address. */
2094         ipv6_addr_all_nodes(&maddr);
2095         ipv6_dev_mc_inc(idev->dev, &maddr);
2096 }
2097
2098 /*
2099  *      Device is about to be destroyed: clean up.
2100  */
2101
2102 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2103 {
2104         struct ifmcaddr6 *i;
2105         struct in6_addr maddr;
2106
2107         /* Deactivate timers */
2108         ipv6_mc_down(idev);
2109
2110         /* Delete all-nodes address. */
2111         ipv6_addr_all_nodes(&maddr);
2112
2113         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2114          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2115          * fail.
2116          */
2117         __ipv6_dev_mc_dec(idev, &maddr);
2118
2119         if (idev->cnf.forwarding) {
2120                 ipv6_addr_all_routers(&maddr);
2121                 __ipv6_dev_mc_dec(idev, &maddr);
2122         }
2123
2124         write_lock_bh(&idev->lock);
2125         while ((i = idev->mc_list) != NULL) {
2126                 idev->mc_list = i->next;
2127                 write_unlock_bh(&idev->lock);
2128
2129                 igmp6_group_dropped(i);
2130                 ma_put(i);
2131
2132                 write_lock_bh(&idev->lock);
2133         }
2134         write_unlock_bh(&idev->lock);
2135 }
2136
2137 #ifdef CONFIG_PROC_FS
2138 struct igmp6_mc_iter_state {
2139         struct net_device *dev;
2140         struct inet6_dev *idev;
2141 };
2142
2143 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2144
2145 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2146 {
2147         struct ifmcaddr6 *im = NULL;
2148         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2149
2150         for (state->dev = dev_base, state->idev = NULL;
2151              state->dev;
2152              state->dev = state->dev->next) {
2153                 struct inet6_dev *idev;
2154                 idev = in6_dev_get(state->dev);
2155                 if (!idev)
2156                         continue;
2157                 read_lock_bh(&idev->lock);
2158                 im = idev->mc_list;
2159                 if (im) {
2160                         state->idev = idev;
2161                         break;
2162                 }
2163                 read_unlock_bh(&idev->lock);
2164                 in6_dev_put(idev);
2165         }
2166         return im;
2167 }
2168
2169 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2170 {
2171         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2172
2173         im = im->next;
2174         while (!im) {
2175                 if (likely(state->idev != NULL)) {
2176                         read_unlock_bh(&state->idev->lock);
2177                         in6_dev_put(state->idev);
2178                 }
2179                 state->dev = state->dev->next;
2180                 if (!state->dev) {
2181                         state->idev = NULL;
2182                         break;
2183                 }
2184                 state->idev = in6_dev_get(state->dev);
2185                 if (!state->idev)
2186                         continue;
2187                 read_lock_bh(&state->idev->lock);
2188                 im = state->idev->mc_list;
2189         }
2190         return im;
2191 }
2192
2193 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2194 {
2195         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2196         if (im)
2197                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2198                         --pos;
2199         return pos ? NULL : im;
2200 }
2201
2202 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2203 {
2204         read_lock(&dev_base_lock);
2205         return igmp6_mc_get_idx(seq, *pos);
2206 }
2207
2208 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2209 {
2210         struct ifmcaddr6 *im;
2211         im = igmp6_mc_get_next(seq, v);
2212         ++*pos;
2213         return im;
2214 }
2215
2216 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2217 {
2218         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2219         if (likely(state->idev != NULL)) {
2220                 read_unlock_bh(&state->idev->lock);
2221                 in6_dev_put(state->idev);
2222                 state->idev = NULL;
2223         }
2224         state->dev = NULL;
2225         read_unlock(&dev_base_lock);
2226 }
2227
2228 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2229 {
2230         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2231         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2232
2233         seq_printf(seq,
2234                    "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n",
2235                    state->dev->ifindex, state->dev->name,
2236                    NIP6(im->mca_addr),
2237                    im->mca_users, im->mca_flags,
2238                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2239                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2240         return 0;
2241 }
2242
2243 static struct seq_operations igmp6_mc_seq_ops = {
2244         .start  =       igmp6_mc_seq_start,
2245         .next   =       igmp6_mc_seq_next,
2246         .stop   =       igmp6_mc_seq_stop,
2247         .show   =       igmp6_mc_seq_show,
2248 };
2249
2250 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2251 {
2252         struct seq_file *seq;
2253         int rc = -ENOMEM;
2254         struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2255
2256         if (!s)
2257                 goto out;
2258
2259         rc = seq_open(file, &igmp6_mc_seq_ops);
2260         if (rc)
2261                 goto out_kfree;
2262
2263         seq = file->private_data;
2264         seq->private = s;
2265         memset(s, 0, sizeof(*s));
2266 out:
2267         return rc;
2268 out_kfree:
2269         kfree(s);
2270         goto out;
2271 }
2272
2273 static struct file_operations igmp6_mc_seq_fops = {
2274         .owner          =       THIS_MODULE,
2275         .open           =       igmp6_mc_seq_open,
2276         .read           =       seq_read,
2277         .llseek         =       seq_lseek,
2278         .release        =       seq_release_private,
2279 };
2280
2281 struct igmp6_mcf_iter_state {
2282         struct net_device *dev;
2283         struct inet6_dev *idev;
2284         struct ifmcaddr6 *im;
2285 };
2286
2287 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2288
2289 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2290 {
2291         struct ip6_sf_list *psf = NULL;
2292         struct ifmcaddr6 *im = NULL;
2293         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2294
2295         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2296              state->dev;
2297              state->dev = state->dev->next) {
2298                 struct inet6_dev *idev;
2299                 idev = in6_dev_get(state->dev);
2300                 if (unlikely(idev == NULL))
2301                         continue;
2302                 read_lock_bh(&idev->lock);
2303                 im = idev->mc_list;
2304                 if (likely(im != NULL)) {
2305                         spin_lock_bh(&im->mca_lock);
2306                         psf = im->mca_sources;
2307                         if (likely(psf != NULL)) {
2308                                 state->im = im;
2309                                 state->idev = idev;
2310                                 break;
2311                         }
2312                         spin_unlock_bh(&im->mca_lock);
2313                 }
2314                 read_unlock_bh(&idev->lock);
2315                 in6_dev_put(idev);
2316         }
2317         return psf;
2318 }
2319
2320 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2321 {
2322         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2323
2324         psf = psf->sf_next;
2325         while (!psf) {
2326                 spin_unlock_bh(&state->im->mca_lock);
2327                 state->im = state->im->next;
2328                 while (!state->im) {
2329                         if (likely(state->idev != NULL)) {
2330                                 read_unlock_bh(&state->idev->lock);
2331                                 in6_dev_put(state->idev);
2332                         }
2333                         state->dev = state->dev->next;
2334                         if (!state->dev) {
2335                                 state->idev = NULL;
2336                                 goto out;
2337                         }
2338                         state->idev = in6_dev_get(state->dev);
2339                         if (!state->idev)
2340                                 continue;
2341                         read_lock_bh(&state->idev->lock);
2342                         state->im = state->idev->mc_list;
2343                 }
2344                 if (!state->im)
2345                         break;
2346                 spin_lock_bh(&state->im->mca_lock);
2347                 psf = state->im->mca_sources;
2348         }
2349 out:
2350         return psf;
2351 }
2352
2353 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2354 {
2355         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2356         if (psf)
2357                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2358                         --pos;
2359         return pos ? NULL : psf;
2360 }
2361
2362 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2363 {
2364         read_lock(&dev_base_lock);
2365         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2366 }
2367
2368 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2369 {
2370         struct ip6_sf_list *psf;
2371         if (v == SEQ_START_TOKEN)
2372                 psf = igmp6_mcf_get_first(seq);
2373         else
2374                 psf = igmp6_mcf_get_next(seq, v);
2375         ++*pos;
2376         return psf;
2377 }
2378
2379 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2380 {
2381         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2382         if (likely(state->im != NULL)) {
2383                 spin_unlock_bh(&state->im->mca_lock);
2384                 state->im = NULL;
2385         }
2386         if (likely(state->idev != NULL)) {
2387                 read_unlock_bh(&state->idev->lock);
2388                 in6_dev_put(state->idev);
2389                 state->idev = NULL;
2390         }
2391         state->dev = NULL;
2392         read_unlock(&dev_base_lock);
2393 }
2394
2395 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2396 {
2397         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2398         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2399
2400         if (v == SEQ_START_TOKEN) {
2401                 seq_printf(seq,
2402                            "%3s %6s "
2403                            "%32s %32s %6s %6s\n", "Idx",
2404                            "Device", "Multicast Address",
2405                            "Source Address", "INC", "EXC");
2406         } else {
2407                 seq_printf(seq,
2408                            "%3d %6.6s "
2409                            "%04x%04x%04x%04x%04x%04x%04x%04x "
2410                            "%04x%04x%04x%04x%04x%04x%04x%04x "
2411                            "%6lu %6lu\n",
2412                            state->dev->ifindex, state->dev->name,
2413                            NIP6(state->im->mca_addr),
2414                            NIP6(psf->sf_addr),
2415                            psf->sf_count[MCAST_INCLUDE],
2416                            psf->sf_count[MCAST_EXCLUDE]);
2417         }
2418         return 0;
2419 }
2420
2421 static struct seq_operations igmp6_mcf_seq_ops = {
2422         .start  =       igmp6_mcf_seq_start,
2423         .next   =       igmp6_mcf_seq_next,
2424         .stop   =       igmp6_mcf_seq_stop,
2425         .show   =       igmp6_mcf_seq_show,
2426 };
2427
2428 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2429 {
2430         struct seq_file *seq;
2431         int rc = -ENOMEM;
2432         struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2433
2434         if (!s)
2435                 goto out;
2436
2437         rc = seq_open(file, &igmp6_mcf_seq_ops);
2438         if (rc)
2439                 goto out_kfree;
2440
2441         seq = file->private_data;
2442         seq->private = s;
2443         memset(s, 0, sizeof(*s));
2444 out:
2445         return rc;
2446 out_kfree:
2447         kfree(s);
2448         goto out;
2449 }
2450
2451 static struct file_operations igmp6_mcf_seq_fops = {
2452         .owner          =       THIS_MODULE,
2453         .open           =       igmp6_mcf_seq_open,
2454         .read           =       seq_read,
2455         .llseek         =       seq_lseek,
2456         .release        =       seq_release_private,
2457 };
2458 #endif
2459
2460 int __init igmp6_init(struct net_proto_family *ops)
2461 {
2462         struct ipv6_pinfo *np;
2463         struct sock *sk;
2464         int err;
2465
2466         err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2467         if (err < 0) {
2468                 printk(KERN_ERR
2469                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2470                        err);
2471                 igmp6_socket = NULL; /* For safety. */
2472                 return err;
2473         }
2474
2475         sk = igmp6_socket->sk;
2476         sk->sk_allocation = GFP_ATOMIC;
2477         sk->sk_prot->unhash(sk);
2478
2479         np = inet6_sk(sk);
2480         np->hop_limit = 1;
2481
2482 #ifdef CONFIG_PROC_FS
2483         proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2484         proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2485 #endif
2486
2487         return 0;
2488 }
2489
2490 void igmp6_cleanup(void)
2491 {
2492         sock_release(igmp6_socket);
2493         igmp6_socket = NULL; /* for safety */
2494
2495 #ifdef CONFIG_PROC_FS
2496         proc_net_remove("mcfilter6");
2497         proc_net_remove("igmp6");
2498 #endif
2499 }