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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         read_lock_bh(&ipv6_sk_mc_lock);
 192         for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
 193                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 194                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 195                         read_unlock_bh(&ipv6_sk_mc_lock);
 196                         return -EADDRINUSE;
 197                 }
 198         }
 199         read_unlock_bh(&ipv6_sk_mc_lock);
 200
 201         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 202
 203         if (mc_lst == NULL)
 204                 return -ENOMEM;
 205
 206         mc_lst->next = NULL;
 207         ipv6_addr_copy(&mc_lst->addr, addr);
 208
 209         if (ifindex == 0) {
 210                 struct rt6_info *rt;
 211                 rt = rt6_lookup(addr, NULL, 0, 0);
 212                 if (rt) {
 213                         dev = rt->rt6i_dev;
 214                         dev_hold(dev);
 215                         dst_release(&rt->u.dst);
 216                 }
 217         } else
 218                 dev = dev_get_by_index(ifindex);
 219
 220         if (dev == NULL) {
 221                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 222                 return -ENODEV;
 223         }
 224
 225         mc_lst->ifindex = dev->ifindex;
 226         mc_lst->sfmode = MCAST_EXCLUDE;
 227         mc_lst->sflist = NULL;
 228
 229         /*
 230          *      now add/increase the group membership on the device
 231          */
 232
 233         err = ipv6_dev_mc_inc(dev, addr);
 234
 235         if (err) {
 236                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 237                 dev_put(dev);
 238                 return err;
 239         }
 240
 241         write_lock_bh(&ipv6_sk_mc_lock);
 242         mc_lst->next = np->ipv6_mc_list;
 243         np->ipv6_mc_list = mc_lst;
 244         write_unlock_bh(&ipv6_sk_mc_lock);
 245
 246         dev_put(dev);
 247
 248         return 0;
 249 }
 250
 251 /*
 252  *      socket leave on multicast group
 253  */
 254 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 255 {
 256         struct ipv6_pinfo *np = inet6_sk(sk);
 257         struct ipv6_mc_socklist *mc_lst, **lnk;
 258
 259         write_lock_bh(&ipv6_sk_mc_lock);
 260         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 261                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 262                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 263                         struct net_device *dev;
 264
 265                         *lnk = mc_lst->next;
 266                         write_unlock_bh(&ipv6_sk_mc_lock);
 267
 268                         if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
 269                                 struct inet6_dev *idev = in6_dev_get(dev);
 270
 271                                 if (idev) {
 272                                         (void) ip6_mc_leave_src(sk,mc_lst,idev);
 273                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 274                                         in6_dev_put(idev);
 275                                 }
 276                                 dev_put(dev);
 277                         }
 278                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 279                         return 0;
 280                 }
 281         }
 282         write_unlock_bh(&ipv6_sk_mc_lock);
 283
 284         return -ENOENT;
 285 }
 286
 287 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
 288 {
 289         struct net_device *dev = NULL;
 290         struct inet6_dev *idev = NULL;
 291
 292         if (ifindex == 0) {
 293                 struct rt6_info *rt;
 294
 295                 rt = rt6_lookup(group, NULL, 0, 0);
 296                 if (rt) {
 297                         dev = rt->rt6i_dev;
 298                         dev_hold(dev);
 299                         dst_release(&rt->u.dst);
 300                 }
 301         } else
 302                 dev = dev_get_by_index(ifindex);
 303
 304         if (!dev)
 305                 return NULL;
 306         idev = in6_dev_get(dev);
 307         if (!idev) {
 308                 dev_put(dev);
 309                 return NULL;
 310         }
 311         read_lock_bh(&idev->lock);
 312         if (idev->dead) {
 313                 read_unlock_bh(&idev->lock);
 314                 in6_dev_put(idev);
 315                 dev_put(dev);
 316                 return NULL;
 317         }
 318         return idev;
 319 }
 320
 321 void ipv6_sock_mc_close(struct sock *sk)
 322 {
 323         struct ipv6_pinfo *np = inet6_sk(sk);
 324         struct ipv6_mc_socklist *mc_lst;
 325
 326         write_lock_bh(&ipv6_sk_mc_lock);
 327         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 328                 struct net_device *dev;
 329
 330                 np->ipv6_mc_list = mc_lst->next;
 331                 write_unlock_bh(&ipv6_sk_mc_lock);
 332
 333                 dev = dev_get_by_index(mc_lst->ifindex);
 334                 if (dev) {
 335                         struct inet6_dev *idev = in6_dev_get(dev);
 336
 337                         if (idev) {
 338                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 339                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 340                                 in6_dev_put(idev);
 341                         }
 342                         dev_put(dev);
 343                 }
 344
 345                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 346
 347                 write_lock_bh(&ipv6_sk_mc_lock);
 348         }
 349         write_unlock_bh(&ipv6_sk_mc_lock);
 350 }
 351
 352 int ip6_mc_source(int add, int omode, struct sock *sk,
 353         struct group_source_req *pgsr)
 354 {
 355         struct in6_addr *source, *group;
 356         struct ipv6_mc_socklist *pmc;
 357         struct net_device *dev;
 358         struct inet6_dev *idev;
 359         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 360         struct ip6_sf_socklist *psl;
 361         int i, j, rv;
 362         int leavegroup = 0;
 363         int err;
 364
 365         if (pgsr->gsr_group.ss_family != AF_INET6 ||
 366             pgsr->gsr_source.ss_family != AF_INET6)
 367                 return -EINVAL;
 368
 369         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 370         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 371
 372         if (!ipv6_addr_is_multicast(group))
 373                 return -EINVAL;
 374
 375         idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
 376         if (!idev)
 377                 return -ENODEV;
 378         dev = idev->dev;
 379
 380         err = -EADDRNOTAVAIL;
 381
 382         read_lock_bh(&ipv6_sk_mc_lock);
 383         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 384                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 385                         continue;
 386                 if (ipv6_addr_equal(&pmc->addr, group))
 387                         break;
 388         }
 389         if (!pmc)               /* must have a prior join */
 390                 goto done;
 391         /* if a source filter was set, must be the same mode as before */
 392         if (pmc->sflist) {
 393                 if (pmc->sfmode != omode)
 394                         goto done;
 395         } else if (pmc->sfmode != omode) {
 396                 /* allow mode switches for empty-set filters */
 397                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 398                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 399                 pmc->sfmode = omode;
 400         }
 401
 402         psl = pmc->sflist;
 403         if (!add) {
 404                 if (!psl)
 405                         goto done;
 406                 rv = !0;
 407                 for (i=0; i<psl->sl_count; i++) {
 408                         rv = memcmp(&psl->sl_addr[i], source,
 409                                 sizeof(struct in6_addr));
 410                         if (rv == 0)
 411                                 break;
 412                 }
 413                 if (rv)         /* source not found */
 414                         goto done;
 415
 416                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 417                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 418                         leavegroup = 1;
 419                         goto done;
 420                 }
 421
 422                 /* update the interface filter */
 423                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 424
 425                 for (j=i+1; j<psl->sl_count; j++)
 426                         psl->sl_addr[j-1] = psl->sl_addr[j];
 427                 psl->sl_count--;
 428                 err = 0;
 429                 goto done;
 430         }
 431         /* else, add a new source to the filter */
 432
 433         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 434                 err = -ENOBUFS;
 435                 goto done;
 436         }
 437         if (!psl || psl->sl_count == psl->sl_max) {
 438                 struct ip6_sf_socklist *newpsl;
 439                 int count = IP6_SFBLOCK;
 440
 441                 if (psl)
 442                         count += psl->sl_max;
 443                 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
 444                         IP6_SFLSIZE(count), GFP_ATOMIC);
 445                 if (!newpsl) {
 446                         err = -ENOBUFS;
 447                         goto done;
 448                 }
 449                 newpsl->sl_max = count;
 450                 newpsl->sl_count = count - IP6_SFBLOCK;
 451                 if (psl) {
 452                         for (i=0; i<psl->sl_count; i++)
 453                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 454                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 455                 }
 456                 pmc->sflist = psl = newpsl;
 457         }
 458         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 459         for (i=0; i<psl->sl_count; i++) {
 460                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 461                 if (rv == 0)
 462                         break;
 463         }
 464         if (rv == 0)            /* address already there is an error */
 465                 goto done;
 466         for (j=psl->sl_count-1; j>=i; j--)
 467                 psl->sl_addr[j+1] = psl->sl_addr[j];
 468         psl->sl_addr[i] = *source;
 469         psl->sl_count++;
 470         err = 0;
 471         /* update the interface list */
 472         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 473 done:
 474         read_unlock_bh(&ipv6_sk_mc_lock);
 475         read_unlock_bh(&idev->lock);
 476         in6_dev_put(idev);
 477         dev_put(dev);
 478         if (leavegroup)
 479                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 480         return err;
 481 }
 482
 483 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 484 {
 485         struct in6_addr *group;
 486         struct ipv6_mc_socklist *pmc;
 487         struct net_device *dev;
 488         struct inet6_dev *idev;
 489         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 490         struct ip6_sf_socklist *newpsl, *psl;
 491         int i, err;
 492
 493         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 494
 495         if (!ipv6_addr_is_multicast(group))
 496                 return -EINVAL;
 497         if (gsf->gf_fmode != MCAST_INCLUDE &&
 498             gsf->gf_fmode != MCAST_EXCLUDE)
 499                 return -EINVAL;
 500
 501         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 502
 503         if (!idev)
 504                 return -ENODEV;
 505         dev = idev->dev;
 506         err = -EADDRNOTAVAIL;
 507
 508         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 509                 if (pmc->ifindex != gsf->gf_interface)
 510                         continue;
 511                 if (ipv6_addr_equal(&pmc->addr, group))
 512                         break;
 513         }
 514         if (!pmc)               /* must have a prior join */
 515                 goto done;
 516         if (gsf->gf_numsrc) {
 517                 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
 518                                 IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
 519                 if (!newpsl) {
 520                         err = -ENOBUFS;
 521                         goto done;
 522                 }
 523                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 524                 for (i=0; i<newpsl->sl_count; ++i) {
 525                         struct sockaddr_in6 *psin6;
 526
 527                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 528                         newpsl->sl_addr[i] = psin6->sin6_addr;
 529                 }
 530                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 531                         newpsl->sl_count, newpsl->sl_addr, 0);
 532                 if (err) {
 533                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 534                         goto done;
 535                 }
 536         } else
 537                 newpsl = NULL;
 538         psl = pmc->sflist;
 539         if (psl) {
 540                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 541                         psl->sl_count, psl->sl_addr, 0);
 542                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 543         } else
 544                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 545         pmc->sflist = newpsl;
 546         pmc->sfmode = gsf->gf_fmode;
 547 done:
 548         read_unlock_bh(&idev->lock);
 549         in6_dev_put(idev);
 550         dev_put(dev);
 551         return err;
 552 }
 553
 554 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 555         struct group_filter __user *optval, int __user *optlen)
 556 {
 557         int err, i, count, copycount;
 558         struct in6_addr *group;
 559         struct ipv6_mc_socklist *pmc;
 560         struct inet6_dev *idev;
 561         struct net_device *dev;
 562         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 563         struct ip6_sf_socklist *psl;
 564
 565         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 566
 567         if (!ipv6_addr_is_multicast(group))
 568                 return -EINVAL;
 569
 570         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 571
 572         if (!idev)
 573                 return -ENODEV;
 574
 575         dev = idev->dev;
 576
 577         err = -EADDRNOTAVAIL;
 578
 579         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 580                 if (pmc->ifindex != gsf->gf_interface)
 581                         continue;
 582                 if (ipv6_addr_equal(group, &pmc->addr))
 583                         break;
 584         }
 585         if (!pmc)               /* must have a prior join */
 586                 goto done;
 587         gsf->gf_fmode = pmc->sfmode;
 588         psl = pmc->sflist;
 589         count = psl ? psl->sl_count : 0;
 590         read_unlock_bh(&idev->lock);
 591         in6_dev_put(idev);
 592         dev_put(dev);
 593
 594         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 595         gsf->gf_numsrc = count;
 596         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 597             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 598                 return -EFAULT;
 599         }
 600         for (i=0; i<copycount; i++) {
 601                 struct sockaddr_in6 *psin6;
 602                 struct sockaddr_storage ss;
 603
 604                 psin6 = (struct sockaddr_in6 *)&ss;
 605                 memset(&ss, 0, sizeof(ss));
 606                 psin6->sin6_family = AF_INET6;
 607                 psin6->sin6_addr = psl->sl_addr[i];
 608                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 609                         return -EFAULT;
 610         }
 611         return 0;
 612 done:
 613         read_unlock_bh(&idev->lock);
 614         in6_dev_put(idev);
 615         dev_put(dev);
 616         return err;
 617 }
 618
 619 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
 620         struct in6_addr *src_addr)
 621 {
 622         struct ipv6_pinfo *np = inet6_sk(sk);
 623         struct ipv6_mc_socklist *mc;
 624         struct ip6_sf_socklist *psl;
 625         int rv = 1;
 626
 627         read_lock(&ipv6_sk_mc_lock);
 628         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 629                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 630                         break;
 631         }
 632         if (!mc) {
 633                 read_unlock(&ipv6_sk_mc_lock);
 634                 return 1;
 635         }
 636         psl = mc->sflist;
 637         if (!psl) {
 638                 rv = mc->sfmode == MCAST_EXCLUDE;
 639         } else {
 640                 int i;
 641
 642                 for (i=0; i<psl->sl_count; i++) {
 643                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 644                                 break;
 645                 }
 646                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 647                         rv = 0;
 648                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 649                         rv = 0;
 650         }
 651         read_unlock(&ipv6_sk_mc_lock);
 652
 653         return rv;
 654 }
 655
 656 static void ma_put(struct ifmcaddr6 *mc)
 657 {
 658         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 659                 in6_dev_put(mc->idev);
 660                 kfree(mc);
 661         }
 662 }
 663
 664 static void igmp6_group_added(struct ifmcaddr6 *mc)
 665 {
 666         struct net_device *dev = mc->idev->dev;
 667         char buf[MAX_ADDR_LEN];
 668
 669         spin_lock_bh(&mc->mca_lock);
 670         if (!(mc->mca_flags&MAF_LOADED)) {
 671                 mc->mca_flags |= MAF_LOADED;
 672                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 673                         dev_mc_add(dev, buf, dev->addr_len, 0);
 674         }
 675         spin_unlock_bh(&mc->mca_lock);
 676
 677         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 678                 return;
 679
 680         if (MLD_V1_SEEN(mc->idev)) {
 681                 igmp6_join_group(mc);
 682                 return;
 683         }
 684         /* else v2 */
 685
 686         mc->mca_crcount = mc->idev->mc_qrv;
 687         mld_ifc_event(mc->idev);
 688 }
 689
 690 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 691 {
 692         struct net_device *dev = mc->idev->dev;
 693         char buf[MAX_ADDR_LEN];
 694
 695         spin_lock_bh(&mc->mca_lock);
 696         if (mc->mca_flags&MAF_LOADED) {
 697                 mc->mca_flags &= ~MAF_LOADED;
 698                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 699                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 700         }
 701
 702         if (mc->mca_flags & MAF_NOREPORT)
 703                 goto done;
 704         spin_unlock_bh(&mc->mca_lock);
 705
 706         if (!mc->idev->dead)
 707                 igmp6_leave_group(mc);
 708
 709         spin_lock_bh(&mc->mca_lock);
 710         if (del_timer(&mc->mca_timer))
 711                 atomic_dec(&mc->mca_refcnt);
 712 done:
 713         ip6_mc_clear_src(mc);
 714         spin_unlock_bh(&mc->mca_lock);
 715 }
 716
 717 /*
 718  * deleted ifmcaddr6 manipulation
 719  */
 720 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 721 {
 722         struct ifmcaddr6 *pmc;
 723
 724         /* this is an "ifmcaddr6" for convenience; only the fields below
 725          * are actually used. In particular, the refcnt and users are not
 726          * used for management of the delete list. Using the same structure
 727          * for deleted items allows change reports to use common code with
 728          * non-deleted or query-response MCA's.
 729          */
 730         pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
 731         if (!pmc)
 732                 return;
 733         memset(pmc, 0, sizeof(*pmc));
 734         spin_lock_bh(&im->mca_lock);
 735         spin_lock_init(&pmc->mca_lock);
 736         pmc->idev = im->idev;
 737         in6_dev_hold(idev);
 738         pmc->mca_addr = im->mca_addr;
 739         pmc->mca_crcount = idev->mc_qrv;
 740         pmc->mca_sfmode = im->mca_sfmode;
 741         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 742                 struct ip6_sf_list *psf;
 743
 744                 pmc->mca_tomb = im->mca_tomb;
 745                 pmc->mca_sources = im->mca_sources;
 746                 im->mca_tomb = im->mca_sources = NULL;
 747                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 748                         psf->sf_crcount = pmc->mca_crcount;
 749         }
 750         spin_unlock_bh(&im->mca_lock);
 751
 752         write_lock_bh(&idev->mc_lock);
 753         pmc->next = idev->mc_tomb;
 754         idev->mc_tomb = pmc;
 755         write_unlock_bh(&idev->mc_lock);
 756 }
 757
 758 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 759 {
 760         struct ifmcaddr6 *pmc, *pmc_prev;
 761         struct ip6_sf_list *psf, *psf_next;
 762
 763         write_lock_bh(&idev->mc_lock);
 764         pmc_prev = NULL;
 765         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 766                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 767                         break;
 768                 pmc_prev = pmc;
 769         }
 770         if (pmc) {
 771                 if (pmc_prev)
 772                         pmc_prev->next = pmc->next;
 773                 else
 774                         idev->mc_tomb = pmc->next;
 775         }
 776         write_unlock_bh(&idev->mc_lock);
 777         if (pmc) {
 778                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 779                         psf_next = psf->sf_next;
 780                         kfree(psf);
 781                 }
 782                 in6_dev_put(pmc->idev);
 783                 kfree(pmc);
 784         }
 785 }
 786
 787 static void mld_clear_delrec(struct inet6_dev *idev)
 788 {
 789         struct ifmcaddr6 *pmc, *nextpmc;
 790
 791         write_lock_bh(&idev->mc_lock);
 792         pmc = idev->mc_tomb;
 793         idev->mc_tomb = NULL;
 794         write_unlock_bh(&idev->mc_lock);
 795
 796         for (; pmc; pmc = nextpmc) {
 797                 nextpmc = pmc->next;
 798                 ip6_mc_clear_src(pmc);
 799                 in6_dev_put(pmc->idev);
 800                 kfree(pmc);
 801         }
 802
 803         /* clear dead sources, too */
 804         read_lock_bh(&idev->lock);
 805         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 806                 struct ip6_sf_list *psf, *psf_next;
 807
 808                 spin_lock_bh(&pmc->mca_lock);
 809                 psf = pmc->mca_tomb;
 810                 pmc->mca_tomb = NULL;
 811                 spin_unlock_bh(&pmc->mca_lock);
 812                 for (; psf; psf=psf_next) {
 813                         psf_next = psf->sf_next;
 814                         kfree(psf);
 815                 }
 816         }
 817         read_unlock_bh(&idev->lock);
 818 }
 819
 820
 821 /*
 822  *      device multicast group inc (add if not found)
 823  */
 824 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
 825 {
 826         struct ifmcaddr6 *mc;
 827         struct inet6_dev *idev;
 828
 829         idev = in6_dev_get(dev);
 830
 831         if (idev == NULL)
 832                 return -EINVAL;
 833
 834         write_lock_bh(&idev->lock);
 835         if (idev->dead) {
 836                 write_unlock_bh(&idev->lock);
 837                 in6_dev_put(idev);
 838                 return -ENODEV;
 839         }
 840
 841         for (mc = idev->mc_list; mc; mc = mc->next) {
 842                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 843                         mc->mca_users++;
 844                         write_unlock_bh(&idev->lock);
 845                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 846                                 NULL, 0);
 847                         in6_dev_put(idev);
 848                         return 0;
 849                 }
 850         }
 851
 852         /*
 853          *      not found: create a new one.
 854          */
 855
 856         mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 857
 858         if (mc == NULL) {
 859                 write_unlock_bh(&idev->lock);
 860                 in6_dev_put(idev);
 861                 return -ENOMEM;
 862         }
 863
 864         memset(mc, 0, sizeof(struct ifmcaddr6));
 865         init_timer(&mc->mca_timer);
 866         mc->mca_timer.function = igmp6_timer_handler;
 867         mc->mca_timer.data = (unsigned long) mc;
 868
 869         ipv6_addr_copy(&mc->mca_addr, addr);
 870         mc->idev = idev;
 871         mc->mca_users = 1;
 872         /* mca_stamp should be updated upon changes */
 873         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 874         atomic_set(&mc->mca_refcnt, 2);
 875         spin_lock_init(&mc->mca_lock);
 876
 877         /* initial mode is (EX, empty) */
 878         mc->mca_sfmode = MCAST_EXCLUDE;
 879         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 880
 881         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 882             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 883                 mc->mca_flags |= MAF_NOREPORT;
 884
 885         mc->next = idev->mc_list;
 886         idev->mc_list = mc;
 887         write_unlock_bh(&idev->lock);
 888
 889         mld_del_delrec(idev, &mc->mca_addr);
 890         igmp6_group_added(mc);
 891         ma_put(mc);
 892         return 0;
 893 }
 894
 895 /*
 896  *      device multicast group del
 897  */
 898 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
 899 {
 900         struct ifmcaddr6 *ma, **map;
 901
 902         write_lock_bh(&idev->lock);
 903         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 904                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 905                         if (--ma->mca_users == 0) {
 906                                 *map = ma->next;
 907                                 write_unlock_bh(&idev->lock);
 908
 909                                 igmp6_group_dropped(ma);
 910
 911                                 ma_put(ma);
 912                                 return 0;
 913                         }
 914                         write_unlock_bh(&idev->lock);
 915                         return 0;
 916                 }
 917         }
 918         write_unlock_bh(&idev->lock);
 919
 920         return -ENOENT;
 921 }
 922
 923 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
 924 {
 925         struct inet6_dev *idev = in6_dev_get(dev);
 926         int err;
 927
 928         if (!idev)
 929                 return -ENODEV;
 930
 931         err = __ipv6_dev_mc_dec(idev, addr);
 932
 933         in6_dev_put(idev);
 934
 935         return err;
 936 }
 937
 938 /*
 939  * identify MLD packets for MLD filter exceptions
 940  */
 941 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 942 {
 943         struct icmp6hdr *pic;
 944
 945         if (nexthdr != IPPROTO_ICMPV6)
 946                 return 0;
 947
 948         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 949                 return 0;
 950
 951         pic = (struct icmp6hdr *)skb->h.raw;
 952
 953         switch (pic->icmp6_type) {
 954         case ICMPV6_MGM_QUERY:
 955         case ICMPV6_MGM_REPORT:
 956         case ICMPV6_MGM_REDUCTION:
 957         case ICMPV6_MLD2_REPORT:
 958                 return 1;
 959         default:
 960                 break;
 961         }
 962         return 0;
 963 }
 964
 965 /*
 966  *      check if the interface/address pair is valid
 967  */
 968 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
 969         struct in6_addr *src_addr)
 970 {
 971         struct inet6_dev *idev;
 972         struct ifmcaddr6 *mc;
 973         int rv = 0;
 974
 975         idev = in6_dev_get(dev);
 976         if (idev) {
 977                 read_lock_bh(&idev->lock);
 978                 for (mc = idev->mc_list; mc; mc=mc->next) {
 979                         if (ipv6_addr_equal(&mc->mca_addr, group))
 980                                 break;
 981                 }
 982                 if (mc) {
 983                         if (src_addr && !ipv6_addr_any(src_addr)) {
 984                                 struct ip6_sf_list *psf;
 985
 986                                 spin_lock_bh(&mc->mca_lock);
 987                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 988                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 989                                                 break;
 990                                 }
 991                                 if (psf)
 992                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 993                                                 psf->sf_count[MCAST_EXCLUDE] !=
 994                                                 mc->mca_sfcount[MCAST_EXCLUDE];
 995                                 else
 996                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 997                                 spin_unlock_bh(&mc->mca_lock);
 998                         } else
 999                                 rv = 1; /* don't filter unspecified source */
1000                 }
1001                 read_unlock_bh(&idev->lock);
1002                 in6_dev_put(idev);
1003         }
1004         return rv;
1005 }
1006
1007 static void mld_gq_start_timer(struct inet6_dev *idev)
1008 {
1009         int tv = net_random() % idev->mc_maxdelay;
1010
1011         idev->mc_gq_running = 1;
1012         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1013                 in6_dev_hold(idev);
1014 }
1015
1016 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1017 {
1018         int tv = net_random() % delay;
1019
1020         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1021                 in6_dev_hold(idev);
1022 }
1023
1024 /*
1025  *      IGMP handling (alias multicast ICMPv6 messages)
1026  */
1027
1028 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1029 {
1030         unsigned long delay = resptime;
1031
1032         /* Do not start timer for these addresses */
1033         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1034             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1035                 return;
1036
1037         if (del_timer(&ma->mca_timer)) {
1038                 atomic_dec(&ma->mca_refcnt);
1039                 delay = ma->mca_timer.expires - jiffies;
1040         }
1041
1042         if (delay >= resptime) {
1043                 if (resptime)
1044                         delay = net_random() % resptime;
1045                 else
1046                         delay = 1;
1047         }
1048         ma->mca_timer.expires = jiffies + delay;
1049         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1050                 atomic_inc(&ma->mca_refcnt);
1051         ma->mca_flags |= MAF_TIMER_RUNNING;
1052 }
1053
1054 static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1055         struct in6_addr *srcs)
1056 {
1057         struct ip6_sf_list *psf;
1058         int i, scount;
1059
1060         scount = 0;
1061         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1062                 if (scount == nsrcs)
1063                         break;
1064                 for (i=0; i<nsrcs; i++)
1065                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1066                                 psf->sf_gsresp = 1;
1067                                 scount++;
1068                                 break;
1069                         }
1070         }
1071 }
1072
1073 int igmp6_event_query(struct sk_buff *skb)
1074 {
1075         struct mld2_query *mlh2 = (struct mld2_query *) skb->h.raw;
1076         struct ifmcaddr6 *ma;
1077         struct in6_addr *group;
1078         unsigned long max_delay;
1079         struct inet6_dev *idev;
1080         struct icmp6hdr *hdr;
1081         int group_type;
1082         int mark = 0;
1083         int len;
1084
1085         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1086                 return -EINVAL;
1087
1088         /* compute payload length excluding extension headers */
1089         len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1090         len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1091
1092         /* Drop queries with not link local source */
1093         if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1094                 return -EINVAL;
1095
1096         idev = in6_dev_get(skb->dev);
1097
1098         if (idev == NULL)
1099                 return 0;
1100
1101         hdr = (struct icmp6hdr *) skb->h.raw;
1102         group = (struct in6_addr *) (hdr + 1);
1103         group_type = ipv6_addr_type(group);
1104
1105         if (group_type != IPV6_ADDR_ANY &&
1106             !(group_type&IPV6_ADDR_MULTICAST)) {
1107                 in6_dev_put(idev);
1108                 return -EINVAL;
1109         }
1110
1111         if (len == 24) {
1112                 int switchback;
1113                 /* MLDv1 router present */
1114
1115                 /* Translate milliseconds to jiffies */
1116                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1117
1118                 switchback = (idev->mc_qrv + 1) * max_delay;
1119                 idev->mc_v1_seen = jiffies + switchback;
1120
1121                 /* cancel the interface change timer */
1122                 idev->mc_ifc_count = 0;
1123                 if (del_timer(&idev->mc_ifc_timer))
1124                         __in6_dev_put(idev);
1125                 /* clear deleted report items */
1126                 mld_clear_delrec(idev);
1127         } else if (len >= 28) {
1128                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1129                 if (!max_delay)
1130                         max_delay = 1;
1131                 idev->mc_maxdelay = max_delay;
1132                 if (mlh2->qrv)
1133                         idev->mc_qrv = mlh2->qrv;
1134                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1135                         if (mlh2->nsrcs) {
1136                                 in6_dev_put(idev);
1137                                 return -EINVAL; /* no sources allowed */
1138                         }
1139                         mld_gq_start_timer(idev);
1140                         in6_dev_put(idev);
1141                         return 0;
1142                 }
1143                 /* mark sources to include, if group & source-specific */
1144                 mark = mlh2->nsrcs != 0;
1145         } else {
1146                 in6_dev_put(idev);
1147                 return -EINVAL;
1148         }
1149
1150         read_lock_bh(&idev->lock);
1151         if (group_type == IPV6_ADDR_ANY) {
1152                 for (ma = idev->mc_list; ma; ma=ma->next) {
1153                         spin_lock_bh(&ma->mca_lock);
1154                         igmp6_group_queried(ma, max_delay);
1155                         spin_unlock_bh(&ma->mca_lock);
1156                 }
1157         } else {
1158                 for (ma = idev->mc_list; ma; ma=ma->next) {
1159                         if (group_type != IPV6_ADDR_ANY &&
1160                             !ipv6_addr_equal(group, &ma->mca_addr))
1161                                 continue;
1162                         spin_lock_bh(&ma->mca_lock);
1163                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1164                                 /* gsquery <- gsquery && mark */
1165                                 if (!mark)
1166                                         ma->mca_flags &= ~MAF_GSQUERY;
1167                         } else {
1168                                 /* gsquery <- mark */
1169                                 if (mark)
1170                                         ma->mca_flags |= MAF_GSQUERY;
1171                                 else
1172                                         ma->mca_flags &= ~MAF_GSQUERY;
1173                         }
1174                         if (ma->mca_flags & MAF_GSQUERY)
1175                                 mld_marksources(ma, ntohs(mlh2->nsrcs),
1176                                         mlh2->srcs);
1177                         igmp6_group_queried(ma, max_delay);
1178                         spin_unlock_bh(&ma->mca_lock);
1179                         if (group_type != IPV6_ADDR_ANY)
1180                                 break;
1181                 }
1182         }
1183         read_unlock_bh(&idev->lock);
1184         in6_dev_put(idev);
1185
1186         return 0;
1187 }
1188
1189
1190 int igmp6_event_report(struct sk_buff *skb)
1191 {
1192         struct ifmcaddr6 *ma;
1193         struct in6_addr *addrp;
1194         struct inet6_dev *idev;
1195         struct icmp6hdr *hdr;
1196         int addr_type;
1197
1198         /* Our own report looped back. Ignore it. */
1199         if (skb->pkt_type == PACKET_LOOPBACK)
1200                 return 0;
1201
1202         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1203                 return -EINVAL;
1204
1205         hdr = (struct icmp6hdr*) skb->h.raw;
1206
1207         /* Drop reports with not link local source */
1208         addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1209         if (addr_type != IPV6_ADDR_ANY &&
1210             !(addr_type&IPV6_ADDR_LINKLOCAL))
1211                 return -EINVAL;
1212
1213         addrp = (struct in6_addr *) (hdr + 1);
1214
1215         idev = in6_dev_get(skb->dev);
1216         if (idev == NULL)
1217                 return -ENODEV;
1218
1219         /*
1220          *      Cancel the timer for this group
1221          */
1222
1223         read_lock_bh(&idev->lock);
1224         for (ma = idev->mc_list; ma; ma=ma->next) {
1225                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1226                         spin_lock(&ma->mca_lock);
1227                         if (del_timer(&ma->mca_timer))
1228                                 atomic_dec(&ma->mca_refcnt);
1229                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1230                         spin_unlock(&ma->mca_lock);
1231                         break;
1232                 }
1233         }
1234         read_unlock_bh(&idev->lock);
1235         in6_dev_put(idev);
1236         return 0;
1237 }
1238
1239 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1240         int gdeleted, int sdeleted)
1241 {
1242         switch (type) {
1243         case MLD2_MODE_IS_INCLUDE:
1244         case MLD2_MODE_IS_EXCLUDE:
1245                 if (gdeleted || sdeleted)
1246                         return 0;
1247                 return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
1248         case MLD2_CHANGE_TO_INCLUDE:
1249                 if (gdeleted || sdeleted)
1250                         return 0;
1251                 return psf->sf_count[MCAST_INCLUDE] != 0;
1252         case MLD2_CHANGE_TO_EXCLUDE:
1253                 if (gdeleted || sdeleted)
1254                         return 0;
1255                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1256                     psf->sf_count[MCAST_INCLUDE])
1257                         return 0;
1258                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1259                         psf->sf_count[MCAST_EXCLUDE];
1260         case MLD2_ALLOW_NEW_SOURCES:
1261                 if (gdeleted || !psf->sf_crcount)
1262                         return 0;
1263                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1264         case MLD2_BLOCK_OLD_SOURCES:
1265                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1266                         return gdeleted || (psf->sf_crcount && sdeleted);
1267                 return psf->sf_crcount && !gdeleted && !sdeleted;
1268         }
1269         return 0;
1270 }
1271
1272 static int
1273 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1274 {
1275         struct ip6_sf_list *psf;
1276         int scount = 0;
1277
1278         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1279                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1280                         continue;
1281                 scount++;
1282         }
1283         return scount;
1284 }
1285
1286 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1287 {
1288         struct sock *sk = igmp6_socket->sk;
1289         struct sk_buff *skb;
1290         struct mld2_report *pmr;
1291         struct in6_addr addr_buf;
1292         int err;
1293         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1294                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1295                      IPV6_TLV_PADN, 0 };
1296
1297         /* we assume size > sizeof(ra) here */
1298         skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1299
1300         if (skb == 0)
1301                 return NULL;
1302
1303         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1304         if (dev->hard_header) {
1305                 unsigned char ha[MAX_ADDR_LEN];
1306
1307                 ndisc_mc_map(&mld2_all_mcr, ha, dev, 1);
1308                 if (dev->hard_header(skb, dev, ETH_P_IPV6,ha,NULL,size) < 0) {
1309                         kfree_skb(skb);
1310                         return NULL;
1311                 }
1312         }
1313
1314         if (ipv6_get_lladdr(dev, &addr_buf)) {
1315                 /* <draft-ietf-magma-mld-source-05.txt>:
1316                  * use unspecified address as the source address
1317                  * when a valid link-local address is not available.
1318                  */
1319                 memset(&addr_buf, 0, sizeof(addr_buf));
1320         }
1321
1322         ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1323
1324         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1325
1326         pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1327         skb->h.raw = (unsigned char *)pmr;
1328         pmr->type = ICMPV6_MLD2_REPORT;
1329         pmr->resv1 = 0;
1330         pmr->csum = 0;
1331         pmr->resv2 = 0;
1332         pmr->ngrec = 0;
1333         return skb;
1334 }
1335
1336 static void mld_sendpack(struct sk_buff *skb)
1337 {
1338         struct ipv6hdr *pip6 = skb->nh.ipv6h;
1339         struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1340         int payload_len, mldlen;
1341         struct inet6_dev *idev = in6_dev_get(skb->dev);
1342         int err;
1343
1344         IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1345         payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1346                 sizeof(struct ipv6hdr);
1347         mldlen = skb->tail - skb->h.raw;
1348         pip6->payload_len = htons(payload_len);
1349
1350         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1351                 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1352         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1353                 dev_queue_xmit);
1354         if (!err) {
1355                 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1356                 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1357         } else
1358                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1359
1360         if (likely(idev != NULL))
1361                 in6_dev_put(idev);
1362 }
1363
1364 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1365 {
1366         return sizeof(struct mld2_grec) + 4*mld_scount(pmc,type,gdel,sdel);
1367 }
1368
1369 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1370         int type, struct mld2_grec **ppgr)
1371 {
1372         struct net_device *dev = pmc->idev->dev;
1373         struct mld2_report *pmr;
1374         struct mld2_grec *pgr;
1375
1376         if (!skb)
1377                 skb = mld_newpack(dev, dev->mtu);
1378         if (!skb)
1379                 return NULL;
1380         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1381         pgr->grec_type = type;
1382         pgr->grec_auxwords = 0;
1383         pgr->grec_nsrcs = 0;
1384         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1385         pmr = (struct mld2_report *)skb->h.raw;
1386         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1387         *ppgr = pgr;
1388         return skb;
1389 }
1390
1391 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1392         skb_tailroom(skb)) : 0)
1393
1394 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1395         int type, int gdeleted, int sdeleted)
1396 {
1397         struct net_device *dev = pmc->idev->dev;
1398         struct mld2_report *pmr;
1399         struct mld2_grec *pgr = NULL;
1400         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1401         int scount, first, isquery, truncate;
1402
1403         if (pmc->mca_flags & MAF_NOREPORT)
1404                 return skb;
1405
1406         isquery = type == MLD2_MODE_IS_INCLUDE ||
1407                   type == MLD2_MODE_IS_EXCLUDE;
1408         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1409                     type == MLD2_CHANGE_TO_EXCLUDE;
1410
1411         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1412
1413         if (!*psf_list) {
1414                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1415                     type == MLD2_BLOCK_OLD_SOURCES)
1416                         return skb;
1417                 if (pmc->mca_crcount || isquery) {
1418                         /* make sure we have room for group header and at
1419                          * least one source.
1420                          */
1421                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
1422                             sizeof(struct in6_addr)) {
1423                                 mld_sendpack(skb);
1424                                 skb = NULL; /* add_grhead will get a new one */
1425                         }
1426                         skb = add_grhead(skb, pmc, type, &pgr);
1427                 }
1428                 return skb;
1429         }
1430         pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1431
1432         /* EX and TO_EX get a fresh packet, if needed */
1433         if (truncate) {
1434                 if (pmr && pmr->ngrec &&
1435                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1436                         if (skb)
1437                                 mld_sendpack(skb);
1438                         skb = mld_newpack(dev, dev->mtu);
1439                 }
1440         }
1441         first = 1;
1442         scount = 0;
1443         psf_prev = NULL;
1444         for (psf=*psf_list; psf; psf=psf_next) {
1445                 struct in6_addr *psrc;
1446
1447                 psf_next = psf->sf_next;
1448
1449                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1450                         psf_prev = psf;
1451                         continue;
1452                 }
1453
1454                 /* clear marks on query responses */
1455                 if (isquery)
1456                         psf->sf_gsresp = 0;
1457
1458                 if (AVAILABLE(skb) < sizeof(*psrc) +
1459                     first*sizeof(struct mld2_grec)) {
1460                         if (truncate && !first)
1461                                 break;   /* truncate these */
1462                         if (pgr)
1463                                 pgr->grec_nsrcs = htons(scount);
1464                         if (skb)
1465                                 mld_sendpack(skb);
1466                         skb = mld_newpack(dev, dev->mtu);
1467                         first = 1;
1468                         scount = 0;
1469                 }
1470                 if (first) {
1471                         skb = add_grhead(skb, pmc, type, &pgr);
1472                         first = 0;
1473                 }
1474                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1475                 *psrc = psf->sf_addr;
1476                 scount++;
1477                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1478                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1479                         psf->sf_crcount--;
1480                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1481                                 if (psf_prev)
1482                                         psf_prev->sf_next = psf->sf_next;
1483                                 else
1484                                         *psf_list = psf->sf_next;
1485                                 kfree(psf);
1486                                 continue;
1487                         }
1488                 }
1489                 psf_prev = psf;
1490         }
1491         if (pgr)
1492                 pgr->grec_nsrcs = htons(scount);
1493
1494         if (isquery)
1495                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1496         return skb;
1497 }
1498
1499 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1500 {
1501         struct sk_buff *skb = NULL;
1502         int type;
1503
1504         if (!pmc) {
1505                 read_lock_bh(&idev->lock);
1506                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1507                         if (pmc->mca_flags & MAF_NOREPORT)
1508                                 continue;
1509                         spin_lock_bh(&pmc->mca_lock);
1510                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1511                                 type = MLD2_MODE_IS_EXCLUDE;
1512                         else
1513                                 type = MLD2_MODE_IS_INCLUDE;
1514                         skb = add_grec(skb, pmc, type, 0, 0);
1515                         spin_unlock_bh(&pmc->mca_lock);
1516                 }
1517                 read_unlock_bh(&idev->lock);
1518         } else {
1519                 spin_lock_bh(&pmc->mca_lock);
1520                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1521                         type = MLD2_MODE_IS_EXCLUDE;
1522                 else
1523                         type = MLD2_MODE_IS_INCLUDE;
1524                 skb = add_grec(skb, pmc, type, 0, 0);
1525                 spin_unlock_bh(&pmc->mca_lock);
1526         }
1527         if (skb)
1528                 mld_sendpack(skb);
1529 }
1530
1531 /*
1532  * remove zero-count source records from a source filter list
1533  */
1534 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1535 {
1536         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1537
1538         psf_prev = NULL;
1539         for (psf=*ppsf; psf; psf = psf_next) {
1540                 psf_next = psf->sf_next;
1541                 if (psf->sf_crcount == 0) {
1542                         if (psf_prev)
1543                                 psf_prev->sf_next = psf->sf_next;
1544                         else
1545                                 *ppsf = psf->sf_next;
1546                         kfree(psf);
1547                 } else
1548                         psf_prev = psf;
1549         }
1550 }
1551
1552 static void mld_send_cr(struct inet6_dev *idev)
1553 {
1554         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1555         struct sk_buff *skb = NULL;
1556         int type, dtype;
1557
1558         read_lock_bh(&idev->lock);
1559         write_lock_bh(&idev->mc_lock);
1560
1561         /* deleted MCA's */
1562         pmc_prev = NULL;
1563         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1564                 pmc_next = pmc->next;
1565                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1566                         type = MLD2_BLOCK_OLD_SOURCES;
1567                         dtype = MLD2_BLOCK_OLD_SOURCES;
1568                         skb = add_grec(skb, pmc, type, 1, 0);
1569                         skb = add_grec(skb, pmc, dtype, 1, 1);
1570                 }
1571                 if (pmc->mca_crcount) {
1572                         pmc->mca_crcount--;
1573                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1574                                 type = MLD2_CHANGE_TO_INCLUDE;
1575                                 skb = add_grec(skb, pmc, type, 1, 0);
1576                         }
1577                         if (pmc->mca_crcount == 0) {
1578                                 mld_clear_zeros(&pmc->mca_tomb);
1579                                 mld_clear_zeros(&pmc->mca_sources);
1580                         }
1581                 }
1582                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1583                     !pmc->mca_sources) {
1584                         if (pmc_prev)
1585                                 pmc_prev->next = pmc_next;
1586                         else
1587                                 idev->mc_tomb = pmc_next;
1588                         in6_dev_put(pmc->idev);
1589                         kfree(pmc);
1590                 } else
1591                         pmc_prev = pmc;
1592         }
1593         write_unlock_bh(&idev->mc_lock);
1594
1595         /* change recs */
1596         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1597                 spin_lock_bh(&pmc->mca_lock);
1598                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1599                         type = MLD2_BLOCK_OLD_SOURCES;
1600                         dtype = MLD2_ALLOW_NEW_SOURCES;
1601                 } else {
1602                         type = MLD2_ALLOW_NEW_SOURCES;
1603                         dtype = MLD2_BLOCK_OLD_SOURCES;
1604                 }
1605                 skb = add_grec(skb, pmc, type, 0, 0);
1606                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1607
1608                 /* filter mode changes */
1609                 if (pmc->mca_crcount) {
1610                         pmc->mca_crcount--;
1611                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1612                                 type = MLD2_CHANGE_TO_EXCLUDE;
1613                         else
1614                                 type = MLD2_CHANGE_TO_INCLUDE;
1615                         skb = add_grec(skb, pmc, type, 0, 0);
1616                 }
1617                 spin_unlock_bh(&pmc->mca_lock);
1618         }
1619         read_unlock_bh(&idev->lock);
1620         if (!skb)
1621                 return;
1622         (void) mld_sendpack(skb);
1623 }
1624
1625 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1626 {
1627         struct sock *sk = igmp6_socket->sk;
1628         struct inet6_dev *idev;
1629         struct sk_buff *skb;
1630         struct icmp6hdr *hdr;
1631         struct in6_addr *snd_addr;
1632         struct in6_addr *addrp;
1633         struct in6_addr addr_buf;
1634         struct in6_addr all_routers;
1635         int err, len, payload_len, full_len;
1636         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1637                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1638                      IPV6_TLV_PADN, 0 };
1639
1640         IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1641         snd_addr = addr;
1642         if (type == ICMPV6_MGM_REDUCTION) {
1643                 snd_addr = &all_routers;
1644                 ipv6_addr_all_routers(&all_routers);
1645         }
1646
1647         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1648         payload_len = len + sizeof(ra);
1649         full_len = sizeof(struct ipv6hdr) + payload_len;
1650
1651         skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1652
1653         if (skb == NULL) {
1654                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1655                 return;
1656         }
1657
1658         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1659         if (dev->hard_header) {
1660                 unsigned char ha[MAX_ADDR_LEN];
1661                 ndisc_mc_map(snd_addr, ha, dev, 1);
1662                 if (dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, full_len) < 0)
1663                         goto out;
1664         }
1665
1666         if (ipv6_get_lladdr(dev, &addr_buf)) {
1667                 /* <draft-ietf-magma-mld-source-05.txt>:
1668                  * use unspecified address as the source address
1669                  * when a valid link-local address is not available.
1670                  */
1671                 memset(&addr_buf, 0, sizeof(addr_buf));
1672         }
1673
1674         ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1675
1676         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1677
1678         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1679         memset(hdr, 0, sizeof(struct icmp6hdr));
1680         hdr->icmp6_type = type;
1681
1682         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1683         ipv6_addr_copy(addrp, addr);
1684
1685         hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1686                                            IPPROTO_ICMPV6,
1687                                            csum_partial((__u8 *) hdr, len, 0));
1688
1689         idev = in6_dev_get(skb->dev);
1690
1691         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1692                 dev_queue_xmit);
1693         if (!err) {
1694                 if (type == ICMPV6_MGM_REDUCTION)
1695                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1696                 else
1697                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1698                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1699                 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1700         } else
1701                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1702
1703         if (likely(idev != NULL))
1704                 in6_dev_put(idev);
1705         return;
1706
1707 out:
1708         IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1709         kfree_skb(skb);
1710 }
1711
1712 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1713         struct in6_addr *psfsrc)
1714 {
1715         struct ip6_sf_list *psf, *psf_prev;
1716         int rv = 0;
1717
1718         psf_prev = NULL;
1719         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1720                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1721                         break;
1722                 psf_prev = psf;
1723         }
1724         if (!psf || psf->sf_count[sfmode] == 0) {
1725                 /* source filter not found, or count wrong =>  bug */
1726                 return -ESRCH;
1727         }
1728         psf->sf_count[sfmode]--;
1729         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1730                 struct inet6_dev *idev = pmc->idev;
1731
1732                 /* no more filters for this source */
1733                 if (psf_prev)
1734                         psf_prev->sf_next = psf->sf_next;
1735                 else
1736                         pmc->mca_sources = psf->sf_next;
1737                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1738                     !MLD_V1_SEEN(idev)) {
1739                         psf->sf_crcount = idev->mc_qrv;
1740                         psf->sf_next = pmc->mca_tomb;
1741                         pmc->mca_tomb = psf;
1742                         rv = 1;
1743                 } else
1744                         kfree(psf);
1745         }
1746         return rv;
1747 }
1748
1749 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1750                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1751                           int delta)
1752 {
1753         struct ifmcaddr6 *pmc;
1754         int     changerec = 0;
1755         int     i, err;
1756
1757         if (!idev)
1758                 return -ENODEV;
1759         read_lock_bh(&idev->lock);
1760         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1761                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1762                         break;
1763         }
1764         if (!pmc) {
1765                 /* MCA not found?? bug */
1766                 read_unlock_bh(&idev->lock);
1767                 return -ESRCH;
1768         }
1769         spin_lock_bh(&pmc->mca_lock);
1770         sf_markstate(pmc);
1771         if (!delta) {
1772                 if (!pmc->mca_sfcount[sfmode]) {
1773                         spin_unlock_bh(&pmc->mca_lock);
1774                         read_unlock_bh(&idev->lock);
1775                         return -EINVAL;
1776                 }
1777                 pmc->mca_sfcount[sfmode]--;
1778         }
1779         err = 0;
1780         for (i=0; i<sfcount; i++) {
1781                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1782
1783                 changerec |= rv > 0;
1784                 if (!err && rv < 0)
1785                         err = rv;
1786         }
1787         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1788             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1789             pmc->mca_sfcount[MCAST_INCLUDE]) {
1790                 struct ip6_sf_list *psf;
1791
1792                 /* filter mode change */
1793                 pmc->mca_sfmode = MCAST_INCLUDE;
1794                 pmc->mca_crcount = idev->mc_qrv;
1795                 idev->mc_ifc_count = pmc->mca_crcount;
1796                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1797                         psf->sf_crcount = 0;
1798                 mld_ifc_event(pmc->idev);
1799         } else if (sf_setstate(pmc) || changerec)
1800                 mld_ifc_event(pmc->idev);
1801         spin_unlock_bh(&pmc->mca_lock);
1802         read_unlock_bh(&idev->lock);
1803         return err;
1804 }
1805
1806 /*
1807  * Add multicast single-source filter to the interface list
1808  */
1809 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1810         struct in6_addr *psfsrc, int delta)
1811 {
1812         struct ip6_sf_list *psf, *psf_prev;
1813
1814         psf_prev = NULL;
1815         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1816                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1817                         break;
1818                 psf_prev = psf;
1819         }
1820         if (!psf) {
1821                 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1822                 if (!psf)
1823                         return -ENOBUFS;
1824                 memset(psf, 0, sizeof(*psf));
1825                 psf->sf_addr = *psfsrc;
1826                 if (psf_prev) {
1827                         psf_prev->sf_next = psf;
1828                 } else
1829                         pmc->mca_sources = psf;
1830         }
1831         psf->sf_count[sfmode]++;
1832         return 0;
1833 }
1834
1835 static void sf_markstate(struct ifmcaddr6 *pmc)
1836 {
1837         struct ip6_sf_list *psf;
1838         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1839
1840         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1841                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1842                         psf->sf_oldin = mca_xcount ==
1843                                 psf->sf_count[MCAST_EXCLUDE] &&
1844                                 !psf->sf_count[MCAST_INCLUDE];
1845                 } else
1846                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1847 }
1848
1849 static int sf_setstate(struct ifmcaddr6 *pmc)
1850 {
1851         struct ip6_sf_list *psf;
1852         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1853         int qrv = pmc->idev->mc_qrv;
1854         int new_in, rv;
1855
1856         rv = 0;
1857         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1858                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1859                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1860                                 !psf->sf_count[MCAST_INCLUDE];
1861                 } else
1862                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1863                 if (new_in != psf->sf_oldin) {
1864                         psf->sf_crcount = qrv;
1865                         rv++;
1866                 }
1867         }
1868         return rv;
1869 }
1870
1871 /*
1872  * Add multicast source filter list to the interface list
1873  */
1874 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
1875                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1876                           int delta)
1877 {
1878         struct ifmcaddr6 *pmc;
1879         int     isexclude;
1880         int     i, err;
1881
1882         if (!idev)
1883                 return -ENODEV;
1884         read_lock_bh(&idev->lock);
1885         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1886                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1887                         break;
1888         }
1889         if (!pmc) {
1890                 /* MCA not found?? bug */
1891                 read_unlock_bh(&idev->lock);
1892                 return -ESRCH;
1893         }
1894         spin_lock_bh(&pmc->mca_lock);
1895
1896         sf_markstate(pmc);
1897         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
1898         if (!delta)
1899                 pmc->mca_sfcount[sfmode]++;
1900         err = 0;
1901         for (i=0; i<sfcount; i++) {
1902                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1903                 if (err)
1904                         break;
1905         }
1906         if (err) {
1907                 int j;
1908
1909                 if (!delta)
1910                         pmc->mca_sfcount[sfmode]--;
1911                 for (j=0; j<i; j++)
1912                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1913         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1914                 struct inet6_dev *idev = pmc->idev;
1915                 struct ip6_sf_list *psf;
1916
1917                 /* filter mode change */
1918                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1919                         pmc->mca_sfmode = MCAST_EXCLUDE;
1920                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
1921                         pmc->mca_sfmode = MCAST_INCLUDE;
1922                 /* else no filters; keep old mode for reports */
1923
1924                 pmc->mca_crcount = idev->mc_qrv;
1925                 idev->mc_ifc_count = pmc->mca_crcount;
1926                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1927                         psf->sf_crcount = 0;
1928                 mld_ifc_event(idev);
1929         } else if (sf_setstate(pmc))
1930                 mld_ifc_event(idev);
1931         spin_unlock_bh(&pmc->mca_lock);
1932         read_unlock_bh(&idev->lock);
1933         return err;
1934 }
1935
1936 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
1937 {
1938         struct ip6_sf_list *psf, *nextpsf;
1939
1940         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
1941                 nextpsf = psf->sf_next;
1942                 kfree(psf);
1943         }
1944         pmc->mca_tomb = NULL;
1945         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
1946                 nextpsf = psf->sf_next;
1947                 kfree(psf);
1948         }
1949         pmc->mca_sources = NULL;
1950         pmc->mca_sfmode = MCAST_EXCLUDE;
1951         pmc->mca_sfcount[MCAST_EXCLUDE] = 0;
1952         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
1953 }
1954
1955
1956 static void igmp6_join_group(struct ifmcaddr6 *ma)
1957 {
1958         unsigned long delay;
1959
1960         if (ma->mca_flags & MAF_NOREPORT)
1961                 return;
1962
1963         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
1964
1965         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
1966
1967         spin_lock_bh(&ma->mca_lock);
1968         if (del_timer(&ma->mca_timer)) {
1969                 atomic_dec(&ma->mca_refcnt);
1970                 delay = ma->mca_timer.expires - jiffies;
1971         }
1972
1973         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1974                 atomic_inc(&ma->mca_refcnt);
1975         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
1976         spin_unlock_bh(&ma->mca_lock);
1977 }
1978
1979 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
1980                             struct inet6_dev *idev)
1981 {
1982         int err;
1983
1984         if (iml->sflist == 0) {
1985                 /* any-source empty exclude case */
1986                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
1987         }
1988         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
1989                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
1990         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
1991         iml->sflist = NULL;
1992         return err;
1993 }
1994
1995 static void igmp6_leave_group(struct ifmcaddr6 *ma)
1996 {
1997         if (MLD_V1_SEEN(ma->idev)) {
1998                 if (ma->mca_flags & MAF_LAST_REPORTER)
1999                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2000                                 ICMPV6_MGM_REDUCTION);
2001         } else {
2002                 mld_add_delrec(ma->idev, ma);
2003                 mld_ifc_event(ma->idev);
2004         }
2005 }
2006
2007 static void mld_gq_timer_expire(unsigned long data)
2008 {
2009         struct inet6_dev *idev = (struct inet6_dev *)data;
2010
2011         idev->mc_gq_running = 0;
2012         mld_send_report(idev, NULL);
2013         __in6_dev_put(idev);
2014 }
2015
2016 static void mld_ifc_timer_expire(unsigned long data)
2017 {
2018         struct inet6_dev *idev = (struct inet6_dev *)data;
2019
2020         mld_send_cr(idev);
2021         if (idev->mc_ifc_count) {
2022                 idev->mc_ifc_count--;
2023                 if (idev->mc_ifc_count)
2024                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2025         }
2026         __in6_dev_put(idev);
2027 }
2028
2029 static void mld_ifc_event(struct inet6_dev *idev)
2030 {
2031         if (MLD_V1_SEEN(idev))
2032                 return;
2033         idev->mc_ifc_count = idev->mc_qrv;
2034         mld_ifc_start_timer(idev, 1);
2035 }
2036
2037
2038 static void igmp6_timer_handler(unsigned long data)
2039 {
2040         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2041
2042         if (MLD_V1_SEEN(ma->idev))
2043                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2044         else
2045                 mld_send_report(ma->idev, ma);
2046
2047         spin_lock(&ma->mca_lock);
2048         ma->mca_flags |=  MAF_LAST_REPORTER;
2049         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2050         spin_unlock(&ma->mca_lock);
2051         ma_put(ma);
2052 }
2053
2054 /* Device going down */
2055
2056 void ipv6_mc_down(struct inet6_dev *idev)
2057 {
2058         struct ifmcaddr6 *i;
2059
2060         /* Withdraw multicast list */
2061
2062         read_lock_bh(&idev->lock);
2063         idev->mc_ifc_count = 0;
2064         if (del_timer(&idev->mc_ifc_timer))
2065                 __in6_dev_put(idev);
2066         idev->mc_gq_running = 0;
2067         if (del_timer(&idev->mc_gq_timer))
2068                 __in6_dev_put(idev);
2069
2070         for (i = idev->mc_list; i; i=i->next)
2071                 igmp6_group_dropped(i);
2072         read_unlock_bh(&idev->lock);
2073
2074         mld_clear_delrec(idev);
2075 }
2076
2077
2078 /* Device going up */
2079
2080 void ipv6_mc_up(struct inet6_dev *idev)
2081 {
2082         struct ifmcaddr6 *i;
2083
2084         /* Install multicast list, except for all-nodes (already installed) */
2085
2086         read_lock_bh(&idev->lock);
2087         for (i = idev->mc_list; i; i=i->next)
2088                 igmp6_group_added(i);
2089         read_unlock_bh(&idev->lock);
2090 }
2091
2092 /* IPv6 device initialization. */
2093
2094 void ipv6_mc_init_dev(struct inet6_dev *idev)
2095 {
2096         struct in6_addr maddr;
2097
2098         write_lock_bh(&idev->lock);
2099         rwlock_init(&idev->mc_lock);
2100         idev->mc_gq_running = 0;
2101         init_timer(&idev->mc_gq_timer);
2102         idev->mc_gq_timer.data = (unsigned long) idev;
2103         idev->mc_gq_timer.function = &mld_gq_timer_expire;
2104         idev->mc_tomb = NULL;
2105         idev->mc_ifc_count = 0;
2106         init_timer(&idev->mc_ifc_timer);
2107         idev->mc_ifc_timer.data = (unsigned long) idev;
2108         idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2109         idev->mc_qrv = MLD_QRV_DEFAULT;
2110         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2111         idev->mc_v1_seen = 0;
2112         write_unlock_bh(&idev->lock);
2113
2114         /* Add all-nodes address. */
2115         ipv6_addr_all_nodes(&maddr);
2116         ipv6_dev_mc_inc(idev->dev, &maddr);
2117 }
2118
2119 /*
2120  *      Device is about to be destroyed: clean up.
2121  */
2122
2123 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2124 {
2125         struct ifmcaddr6 *i;
2126         struct in6_addr maddr;
2127
2128         /* Deactivate timers */
2129         ipv6_mc_down(idev);
2130
2131         /* Delete all-nodes address. */
2132         ipv6_addr_all_nodes(&maddr);
2133
2134         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2135          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2136          * fail.
2137          */
2138         __ipv6_dev_mc_dec(idev, &maddr);
2139
2140         if (idev->cnf.forwarding) {
2141                 ipv6_addr_all_routers(&maddr);
2142                 __ipv6_dev_mc_dec(idev, &maddr);
2143         }
2144
2145         write_lock_bh(&idev->lock);
2146         while ((i = idev->mc_list) != NULL) {
2147                 idev->mc_list = i->next;
2148                 write_unlock_bh(&idev->lock);
2149
2150                 igmp6_group_dropped(i);
2151                 ma_put(i);
2152
2153                 write_lock_bh(&idev->lock);
2154         }
2155         write_unlock_bh(&idev->lock);
2156 }
2157
2158 #ifdef CONFIG_PROC_FS
2159 struct igmp6_mc_iter_state {
2160         struct net_device *dev;
2161         struct inet6_dev *idev;
2162 };
2163
2164 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2165
2166 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2167 {
2168         struct ifmcaddr6 *im = NULL;
2169         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2170
2171         for (state->dev = dev_base, state->idev = NULL;
2172              state->dev;
2173              state->dev = state->dev->next) {
2174                 struct inet6_dev *idev;
2175                 idev = in6_dev_get(state->dev);
2176                 if (!idev)
2177                         continue;
2178                 read_lock_bh(&idev->lock);
2179                 im = idev->mc_list;
2180                 if (im) {
2181                         state->idev = idev;
2182                         break;
2183                 }
2184                 read_unlock_bh(&idev->lock);
2185                 in6_dev_put(idev);
2186         }
2187         return im;
2188 }
2189
2190 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2191 {
2192         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2193
2194         im = im->next;
2195         while (!im) {
2196                 if (likely(state->idev != NULL)) {
2197                         read_unlock_bh(&state->idev->lock);
2198                         in6_dev_put(state->idev);
2199                 }
2200                 state->dev = state->dev->next;
2201                 if (!state->dev) {
2202                         state->idev = NULL;
2203                         break;
2204                 }
2205                 state->idev = in6_dev_get(state->dev);
2206                 if (!state->idev)
2207                         continue;
2208                 read_lock_bh(&state->idev->lock);
2209                 im = state->idev->mc_list;
2210         }
2211         return im;
2212 }
2213
2214 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2215 {
2216         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2217         if (im)
2218                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2219                         --pos;
2220         return pos ? NULL : im;
2221 }
2222
2223 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2224 {
2225         read_lock(&dev_base_lock);
2226         return igmp6_mc_get_idx(seq, *pos);
2227 }
2228
2229 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2230 {
2231         struct ifmcaddr6 *im;
2232         im = igmp6_mc_get_next(seq, v);
2233         ++*pos;
2234         return im;
2235 }
2236
2237 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2238 {
2239         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2240         if (likely(state->idev != NULL)) {
2241                 read_unlock_bh(&state->idev->lock);
2242                 in6_dev_put(state->idev);
2243                 state->idev = NULL;
2244         }
2245         state->dev = NULL;
2246         read_unlock(&dev_base_lock);
2247 }
2248
2249 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2250 {
2251         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2252         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2253
2254         seq_printf(seq,
2255                    "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n",
2256                    state->dev->ifindex, state->dev->name,
2257                    NIP6(im->mca_addr),
2258                    im->mca_users, im->mca_flags,
2259                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2260                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2261         return 0;
2262 }
2263
2264 static struct seq_operations igmp6_mc_seq_ops = {
2265         .start  =       igmp6_mc_seq_start,
2266         .next   =       igmp6_mc_seq_next,
2267         .stop   =       igmp6_mc_seq_stop,
2268         .show   =       igmp6_mc_seq_show,
2269 };
2270
2271 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2272 {
2273         struct seq_file *seq;
2274         int rc = -ENOMEM;
2275         struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2276
2277         if (!s)
2278                 goto out;
2279
2280         rc = seq_open(file, &igmp6_mc_seq_ops);
2281         if (rc)
2282                 goto out_kfree;
2283
2284         seq = file->private_data;
2285         seq->private = s;
2286         memset(s, 0, sizeof(*s));
2287 out:
2288         return rc;
2289 out_kfree:
2290         kfree(s);
2291         goto out;
2292 }
2293
2294 static struct file_operations igmp6_mc_seq_fops = {
2295         .owner          =       THIS_MODULE,
2296         .open           =       igmp6_mc_seq_open,
2297         .read           =       seq_read,
2298         .llseek         =       seq_lseek,
2299         .release        =       seq_release_private,
2300 };
2301
2302 struct igmp6_mcf_iter_state {
2303         struct net_device *dev;
2304         struct inet6_dev *idev;
2305         struct ifmcaddr6 *im;
2306 };
2307
2308 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2309
2310 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2311 {
2312         struct ip6_sf_list *psf = NULL;
2313         struct ifmcaddr6 *im = NULL;
2314         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2315
2316         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2317              state->dev;
2318              state->dev = state->dev->next) {
2319                 struct inet6_dev *idev;
2320                 idev = in6_dev_get(state->dev);
2321                 if (unlikely(idev == NULL))
2322                         continue;
2323                 read_lock_bh(&idev->lock);
2324                 im = idev->mc_list;
2325                 if (likely(im != NULL)) {
2326                         spin_lock_bh(&im->mca_lock);
2327                         psf = im->mca_sources;
2328                         if (likely(psf != NULL)) {
2329                                 state->im = im;
2330                                 state->idev = idev;
2331                                 break;
2332                         }
2333                         spin_unlock_bh(&im->mca_lock);
2334                 }
2335                 read_unlock_bh(&idev->lock);
2336                 in6_dev_put(idev);
2337         }
2338         return psf;
2339 }
2340
2341 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2342 {
2343         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2344
2345         psf = psf->sf_next;
2346         while (!psf) {
2347                 spin_unlock_bh(&state->im->mca_lock);
2348                 state->im = state->im->next;
2349                 while (!state->im) {
2350                         if (likely(state->idev != NULL)) {
2351                                 read_unlock_bh(&state->idev->lock);
2352                                 in6_dev_put(state->idev);
2353                         }
2354                         state->dev = state->dev->next;
2355                         if (!state->dev) {
2356                                 state->idev = NULL;
2357                                 goto out;
2358                         }
2359                         state->idev = in6_dev_get(state->dev);
2360                         if (!state->idev)
2361                                 continue;
2362                         read_lock_bh(&state->idev->lock);
2363                         state->im = state->idev->mc_list;
2364                 }
2365                 if (!state->im)
2366                         break;
2367                 spin_lock_bh(&state->im->mca_lock);
2368                 psf = state->im->mca_sources;
2369         }
2370 out:
2371         return psf;
2372 }
2373
2374 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2375 {
2376         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2377         if (psf)
2378                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2379                         --pos;
2380         return pos ? NULL : psf;
2381 }
2382
2383 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2384 {
2385         read_lock(&dev_base_lock);
2386         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2387 }
2388
2389 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2390 {
2391         struct ip6_sf_list *psf;
2392         if (v == SEQ_START_TOKEN)
2393                 psf = igmp6_mcf_get_first(seq);
2394         else
2395                 psf = igmp6_mcf_get_next(seq, v);
2396         ++*pos;
2397         return psf;
2398 }
2399
2400 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2401 {
2402         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2403         if (likely(state->im != NULL)) {
2404                 spin_unlock_bh(&state->im->mca_lock);
2405                 state->im = NULL;
2406         }
2407         if (likely(state->idev != NULL)) {
2408                 read_unlock_bh(&state->idev->lock);
2409                 in6_dev_put(state->idev);
2410                 state->idev = NULL;
2411         }
2412         state->dev = NULL;
2413         read_unlock(&dev_base_lock);
2414 }
2415
2416 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2417 {
2418         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2419         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2420
2421         if (v == SEQ_START_TOKEN) {
2422                 seq_printf(seq,
2423                            "%3s %6s "
2424                            "%32s %32s %6s %6s\n", "Idx",
2425                            "Device", "Multicast Address",
2426                            "Source Address", "INC", "EXC");
2427         } else {
2428                 seq_printf(seq,
2429                            "%3d %6.6s "
2430                            "%04x%04x%04x%04x%04x%04x%04x%04x "
2431                            "%04x%04x%04x%04x%04x%04x%04x%04x "
2432                            "%6lu %6lu\n",
2433                            state->dev->ifindex, state->dev->name,
2434                            NIP6(state->im->mca_addr),
2435                            NIP6(psf->sf_addr),
2436                            psf->sf_count[MCAST_INCLUDE],
2437                            psf->sf_count[MCAST_EXCLUDE]);
2438         }
2439         return 0;
2440 }
2441
2442 static struct seq_operations igmp6_mcf_seq_ops = {
2443         .start  =       igmp6_mcf_seq_start,
2444         .next   =       igmp6_mcf_seq_next,
2445         .stop   =       igmp6_mcf_seq_stop,
2446         .show   =       igmp6_mcf_seq_show,
2447 };
2448
2449 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2450 {
2451         struct seq_file *seq;
2452         int rc = -ENOMEM;
2453         struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2454
2455         if (!s)
2456                 goto out;
2457
2458         rc = seq_open(file, &igmp6_mcf_seq_ops);
2459         if (rc)
2460                 goto out_kfree;
2461
2462         seq = file->private_data;
2463         seq->private = s;
2464         memset(s, 0, sizeof(*s));
2465 out:
2466         return rc;
2467 out_kfree:
2468         kfree(s);
2469         goto out;
2470 }
2471
2472 static struct file_operations igmp6_mcf_seq_fops = {
2473         .owner          =       THIS_MODULE,
2474         .open           =       igmp6_mcf_seq_open,
2475         .read           =       seq_read,
2476         .llseek         =       seq_lseek,
2477         .release        =       seq_release_private,
2478 };
2479 #endif
2480
2481 int __init igmp6_init(struct net_proto_family *ops)
2482 {
2483         struct ipv6_pinfo *np;
2484         struct sock *sk;
2485         int err;
2486
2487         err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2488         if (err < 0) {
2489                 printk(KERN_ERR
2490                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2491                        err);
2492                 igmp6_socket = NULL; /* For safety. */
2493                 return err;
2494         }
2495
2496         sk = igmp6_socket->sk;
2497         sk->sk_allocation = GFP_ATOMIC;
2498         sk->sk_prot->unhash(sk);
2499
2500         np = inet6_sk(sk);
2501         np->hop_limit = 1;
2502
2503 #ifdef CONFIG_PROC_FS
2504         proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2505         proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2506 #endif
2507
2508         return 0;
2509 }
2510
2511 void igmp6_cleanup(void)
2512 {
2513         sock_release(igmp6_socket);
2514         igmp6_socket = NULL; /* for safety */
2515
2516 #ifdef CONFIG_PROC_FS
2517         proc_net_remove("mcfilter6");
2518         proc_net_remove("igmp6");
2519 #endif
2520 }