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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                 err = -EINVAL;
 391                 goto done;
 392         }
 393         /* if a source filter was set, must be the same mode as before */
 394         if (pmc->sflist) {
 395                 if (pmc->sfmode != omode) {
 396                         err = -EINVAL;
 397                         goto done;
 398                 }
 399         } else if (pmc->sfmode != omode) {
 400                 /* allow mode switches for empty-set filters */
 401                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 402                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 403                 pmc->sfmode = omode;
 404         }
 405
 406         psl = pmc->sflist;
 407         if (!add) {
 408                 if (!psl)
 409                         goto done;      /* err = -EADDRNOTAVAIL */
 410                 rv = !0;
 411                 for (i=0; i<psl->sl_count; i++) {
 412                         rv = memcmp(&psl->sl_addr[i], source,
 413                                 sizeof(struct in6_addr));
 414                         if (rv == 0)
 415                                 break;
 416                 }
 417                 if (rv)         /* source not found */
 418                         goto done;      /* err = -EADDRNOTAVAIL */
 419
 420                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 421                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 422                         leavegroup = 1;
 423                         goto done;
 424                 }
 425
 426                 /* update the interface filter */
 427                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 428
 429                 for (j=i+1; j<psl->sl_count; j++)
 430                         psl->sl_addr[j-1] = psl->sl_addr[j];
 431                 psl->sl_count--;
 432                 err = 0;
 433                 goto done;
 434         }
 435         /* else, add a new source to the filter */
 436
 437         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 438                 err = -ENOBUFS;
 439                 goto done;
 440         }
 441         if (!psl || psl->sl_count == psl->sl_max) {
 442                 struct ip6_sf_socklist *newpsl;
 443                 int count = IP6_SFBLOCK;
 444
 445                 if (psl)
 446                         count += psl->sl_max;
 447                 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
 448                         IP6_SFLSIZE(count), GFP_ATOMIC);
 449                 if (!newpsl) {
 450                         err = -ENOBUFS;
 451                         goto done;
 452                 }
 453                 newpsl->sl_max = count;
 454                 newpsl->sl_count = count - IP6_SFBLOCK;
 455                 if (psl) {
 456                         for (i=0; i<psl->sl_count; i++)
 457                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 458                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 459                 }
 460                 pmc->sflist = psl = newpsl;
 461         }
 462         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 463         for (i=0; i<psl->sl_count; i++) {
 464                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 465                 if (rv == 0)
 466                         break;
 467         }
 468         if (rv == 0)            /* address already there is an error */
 469                 goto done;
 470         for (j=psl->sl_count-1; j>=i; j--)
 471                 psl->sl_addr[j+1] = psl->sl_addr[j];
 472         psl->sl_addr[i] = *source;
 473         psl->sl_count++;
 474         err = 0;
 475         /* update the interface list */
 476         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 477 done:
 478         read_unlock_bh(&ipv6_sk_mc_lock);
 479         read_unlock_bh(&idev->lock);
 480         in6_dev_put(idev);
 481         dev_put(dev);
 482         if (leavegroup)
 483                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 484         return err;
 485 }
 486
 487 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 488 {
 489         struct in6_addr *group;
 490         struct ipv6_mc_socklist *pmc;
 491         struct net_device *dev;
 492         struct inet6_dev *idev;
 493         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 494         struct ip6_sf_socklist *newpsl, *psl;
 495         int i, err;
 496
 497         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 498
 499         if (!ipv6_addr_is_multicast(group))
 500                 return -EINVAL;
 501         if (gsf->gf_fmode != MCAST_INCLUDE &&
 502             gsf->gf_fmode != MCAST_EXCLUDE)
 503                 return -EINVAL;
 504
 505         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 506
 507         if (!idev)
 508                 return -ENODEV;
 509         dev = idev->dev;
 510
 511         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 512                 if (pmc->ifindex != gsf->gf_interface)
 513                         continue;
 514                 if (ipv6_addr_equal(&pmc->addr, group))
 515                         break;
 516         }
 517         if (!pmc) {             /* must have a prior join */
 518                 err = -EINVAL;
 519                 goto done;
 520         }
 521         if (gsf->gf_numsrc) {
 522                 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
 523                                 IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
 524                 if (!newpsl) {
 525                         err = -ENOBUFS;
 526                         goto done;
 527                 }
 528                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 529                 for (i=0; i<newpsl->sl_count; ++i) {
 530                         struct sockaddr_in6 *psin6;
 531
 532                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 533                         newpsl->sl_addr[i] = psin6->sin6_addr;
 534                 }
 535                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 536                         newpsl->sl_count, newpsl->sl_addr, 0);
 537                 if (err) {
 538                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 539                         goto done;
 540                 }
 541         } else
 542                 newpsl = NULL;
 543         psl = pmc->sflist;
 544         if (psl) {
 545                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 546                         psl->sl_count, psl->sl_addr, 0);
 547                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 548         } else
 549                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 550         pmc->sflist = newpsl;
 551         pmc->sfmode = gsf->gf_fmode;
 552         err = 0;
 553 done:
 554         read_unlock_bh(&idev->lock);
 555         in6_dev_put(idev);
 556         dev_put(dev);
 557         return err;
 558 }
 559
 560 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 561         struct group_filter __user *optval, int __user *optlen)
 562 {
 563         int err, i, count, copycount;
 564         struct in6_addr *group;
 565         struct ipv6_mc_socklist *pmc;
 566         struct inet6_dev *idev;
 567         struct net_device *dev;
 568         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 569         struct ip6_sf_socklist *psl;
 570
 571         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 572
 573         if (!ipv6_addr_is_multicast(group))
 574                 return -EINVAL;
 575
 576         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 577
 578         if (!idev)
 579                 return -ENODEV;
 580
 581         dev = idev->dev;
 582
 583         err = -EADDRNOTAVAIL;
 584
 585         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 586                 if (pmc->ifindex != gsf->gf_interface)
 587                         continue;
 588                 if (ipv6_addr_equal(group, &pmc->addr))
 589                         break;
 590         }
 591         if (!pmc)               /* must have a prior join */
 592                 goto done;
 593         gsf->gf_fmode = pmc->sfmode;
 594         psl = pmc->sflist;
 595         count = psl ? psl->sl_count : 0;
 596         read_unlock_bh(&idev->lock);
 597         in6_dev_put(idev);
 598         dev_put(dev);
 599
 600         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 601         gsf->gf_numsrc = count;
 602         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 603             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 604                 return -EFAULT;
 605         }
 606         for (i=0; i<copycount; i++) {
 607                 struct sockaddr_in6 *psin6;
 608                 struct sockaddr_storage ss;
 609
 610                 psin6 = (struct sockaddr_in6 *)&ss;
 611                 memset(&ss, 0, sizeof(ss));
 612                 psin6->sin6_family = AF_INET6;
 613                 psin6->sin6_addr = psl->sl_addr[i];
 614                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 615                         return -EFAULT;
 616         }
 617         return 0;
 618 done:
 619         read_unlock_bh(&idev->lock);
 620         in6_dev_put(idev);
 621         dev_put(dev);
 622         return err;
 623 }
 624
 625 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
 626         struct in6_addr *src_addr)
 627 {
 628         struct ipv6_pinfo *np = inet6_sk(sk);
 629         struct ipv6_mc_socklist *mc;
 630         struct ip6_sf_socklist *psl;
 631         int rv = 1;
 632
 633         read_lock(&ipv6_sk_mc_lock);
 634         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 635                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 636                         break;
 637         }
 638         if (!mc) {
 639                 read_unlock(&ipv6_sk_mc_lock);
 640                 return 1;
 641         }
 642         psl = mc->sflist;
 643         if (!psl) {
 644                 rv = mc->sfmode == MCAST_EXCLUDE;
 645         } else {
 646                 int i;
 647
 648                 for (i=0; i<psl->sl_count; i++) {
 649                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 650                                 break;
 651                 }
 652                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 653                         rv = 0;
 654                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 655                         rv = 0;
 656         }
 657         read_unlock(&ipv6_sk_mc_lock);
 658
 659         return rv;
 660 }
 661
 662 static void ma_put(struct ifmcaddr6 *mc)
 663 {
 664         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 665                 in6_dev_put(mc->idev);
 666                 kfree(mc);
 667         }
 668 }
 669
 670 static void igmp6_group_added(struct ifmcaddr6 *mc)
 671 {
 672         struct net_device *dev = mc->idev->dev;
 673         char buf[MAX_ADDR_LEN];
 674
 675         spin_lock_bh(&mc->mca_lock);
 676         if (!(mc->mca_flags&MAF_LOADED)) {
 677                 mc->mca_flags |= MAF_LOADED;
 678                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 679                         dev_mc_add(dev, buf, dev->addr_len, 0);
 680         }
 681         spin_unlock_bh(&mc->mca_lock);
 682
 683         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 684                 return;
 685
 686         if (MLD_V1_SEEN(mc->idev)) {
 687                 igmp6_join_group(mc);
 688                 return;
 689         }
 690         /* else v2 */
 691
 692         mc->mca_crcount = mc->idev->mc_qrv;
 693         mld_ifc_event(mc->idev);
 694 }
 695
 696 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 697 {
 698         struct net_device *dev = mc->idev->dev;
 699         char buf[MAX_ADDR_LEN];
 700
 701         spin_lock_bh(&mc->mca_lock);
 702         if (mc->mca_flags&MAF_LOADED) {
 703                 mc->mca_flags &= ~MAF_LOADED;
 704                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 705                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 706         }
 707
 708         if (mc->mca_flags & MAF_NOREPORT)
 709                 goto done;
 710         spin_unlock_bh(&mc->mca_lock);
 711
 712         if (!mc->idev->dead)
 713                 igmp6_leave_group(mc);
 714
 715         spin_lock_bh(&mc->mca_lock);
 716         if (del_timer(&mc->mca_timer))
 717                 atomic_dec(&mc->mca_refcnt);
 718 done:
 719         ip6_mc_clear_src(mc);
 720         spin_unlock_bh(&mc->mca_lock);
 721 }
 722
 723 /*
 724  * deleted ifmcaddr6 manipulation
 725  */
 726 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 727 {
 728         struct ifmcaddr6 *pmc;
 729
 730         /* this is an "ifmcaddr6" for convenience; only the fields below
 731          * are actually used. In particular, the refcnt and users are not
 732          * used for management of the delete list. Using the same structure
 733          * for deleted items allows change reports to use common code with
 734          * non-deleted or query-response MCA's.
 735          */
 736         pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
 737         if (!pmc)
 738                 return;
 739         memset(pmc, 0, sizeof(*pmc));
 740         spin_lock_bh(&im->mca_lock);
 741         spin_lock_init(&pmc->mca_lock);
 742         pmc->idev = im->idev;
 743         in6_dev_hold(idev);
 744         pmc->mca_addr = im->mca_addr;
 745         pmc->mca_crcount = idev->mc_qrv;
 746         pmc->mca_sfmode = im->mca_sfmode;
 747         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 748                 struct ip6_sf_list *psf;
 749
 750                 pmc->mca_tomb = im->mca_tomb;
 751                 pmc->mca_sources = im->mca_sources;
 752                 im->mca_tomb = im->mca_sources = NULL;
 753                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 754                         psf->sf_crcount = pmc->mca_crcount;
 755         }
 756         spin_unlock_bh(&im->mca_lock);
 757
 758         write_lock_bh(&idev->mc_lock);
 759         pmc->next = idev->mc_tomb;
 760         idev->mc_tomb = pmc;
 761         write_unlock_bh(&idev->mc_lock);
 762 }
 763
 764 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 765 {
 766         struct ifmcaddr6 *pmc, *pmc_prev;
 767         struct ip6_sf_list *psf, *psf_next;
 768
 769         write_lock_bh(&idev->mc_lock);
 770         pmc_prev = NULL;
 771         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 772                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 773                         break;
 774                 pmc_prev = pmc;
 775         }
 776         if (pmc) {
 777                 if (pmc_prev)
 778                         pmc_prev->next = pmc->next;
 779                 else
 780                         idev->mc_tomb = pmc->next;
 781         }
 782         write_unlock_bh(&idev->mc_lock);
 783         if (pmc) {
 784                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 785                         psf_next = psf->sf_next;
 786                         kfree(psf);
 787                 }
 788                 in6_dev_put(pmc->idev);
 789                 kfree(pmc);
 790         }
 791 }
 792
 793 static void mld_clear_delrec(struct inet6_dev *idev)
 794 {
 795         struct ifmcaddr6 *pmc, *nextpmc;
 796
 797         write_lock_bh(&idev->mc_lock);
 798         pmc = idev->mc_tomb;
 799         idev->mc_tomb = NULL;
 800         write_unlock_bh(&idev->mc_lock);
 801
 802         for (; pmc; pmc = nextpmc) {
 803                 nextpmc = pmc->next;
 804                 ip6_mc_clear_src(pmc);
 805                 in6_dev_put(pmc->idev);
 806                 kfree(pmc);
 807         }
 808
 809         /* clear dead sources, too */
 810         read_lock_bh(&idev->lock);
 811         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 812                 struct ip6_sf_list *psf, *psf_next;
 813
 814                 spin_lock_bh(&pmc->mca_lock);
 815                 psf = pmc->mca_tomb;
 816                 pmc->mca_tomb = NULL;
 817                 spin_unlock_bh(&pmc->mca_lock);
 818                 for (; psf; psf=psf_next) {
 819                         psf_next = psf->sf_next;
 820                         kfree(psf);
 821                 }
 822         }
 823         read_unlock_bh(&idev->lock);
 824 }
 825
 826
 827 /*
 828  *      device multicast group inc (add if not found)
 829  */
 830 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
 831 {
 832         struct ifmcaddr6 *mc;
 833         struct inet6_dev *idev;
 834
 835         idev = in6_dev_get(dev);
 836
 837         if (idev == NULL)
 838                 return -EINVAL;
 839
 840         write_lock_bh(&idev->lock);
 841         if (idev->dead) {
 842                 write_unlock_bh(&idev->lock);
 843                 in6_dev_put(idev);
 844                 return -ENODEV;
 845         }
 846
 847         for (mc = idev->mc_list; mc; mc = mc->next) {
 848                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 849                         mc->mca_users++;
 850                         write_unlock_bh(&idev->lock);
 851                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 852                                 NULL, 0);
 853                         in6_dev_put(idev);
 854                         return 0;
 855                 }
 856         }
 857
 858         /*
 859          *      not found: create a new one.
 860          */
 861
 862         mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 863
 864         if (mc == NULL) {
 865                 write_unlock_bh(&idev->lock);
 866                 in6_dev_put(idev);
 867                 return -ENOMEM;
 868         }
 869
 870         memset(mc, 0, sizeof(struct ifmcaddr6));
 871         init_timer(&mc->mca_timer);
 872         mc->mca_timer.function = igmp6_timer_handler;
 873         mc->mca_timer.data = (unsigned long) mc;
 874
 875         ipv6_addr_copy(&mc->mca_addr, addr);
 876         mc->idev = idev;
 877         mc->mca_users = 1;
 878         /* mca_stamp should be updated upon changes */
 879         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 880         atomic_set(&mc->mca_refcnt, 2);
 881         spin_lock_init(&mc->mca_lock);
 882
 883         /* initial mode is (EX, empty) */
 884         mc->mca_sfmode = MCAST_EXCLUDE;
 885         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 886
 887         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 888             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 889                 mc->mca_flags |= MAF_NOREPORT;
 890
 891         mc->next = idev->mc_list;
 892         idev->mc_list = mc;
 893         write_unlock_bh(&idev->lock);
 894
 895         mld_del_delrec(idev, &mc->mca_addr);
 896         igmp6_group_added(mc);
 897         ma_put(mc);
 898         return 0;
 899 }
 900
 901 /*
 902  *      device multicast group del
 903  */
 904 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
 905 {
 906         struct ifmcaddr6 *ma, **map;
 907
 908         write_lock_bh(&idev->lock);
 909         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 910                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 911                         if (--ma->mca_users == 0) {
 912                                 *map = ma->next;
 913                                 write_unlock_bh(&idev->lock);
 914
 915                                 igmp6_group_dropped(ma);
 916
 917                                 ma_put(ma);
 918                                 return 0;
 919                         }
 920                         write_unlock_bh(&idev->lock);
 921                         return 0;
 922                 }
 923         }
 924         write_unlock_bh(&idev->lock);
 925
 926         return -ENOENT;
 927 }
 928
 929 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
 930 {
 931         struct inet6_dev *idev = in6_dev_get(dev);
 932         int err;
 933
 934         if (!idev)
 935                 return -ENODEV;
 936
 937         err = __ipv6_dev_mc_dec(idev, addr);
 938
 939         in6_dev_put(idev);
 940
 941         return err;
 942 }
 943
 944 /*
 945  * identify MLD packets for MLD filter exceptions
 946  */
 947 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 948 {
 949         struct icmp6hdr *pic;
 950
 951         if (nexthdr != IPPROTO_ICMPV6)
 952                 return 0;
 953
 954         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 955                 return 0;
 956
 957         pic = (struct icmp6hdr *)skb->h.raw;
 958
 959         switch (pic->icmp6_type) {
 960         case ICMPV6_MGM_QUERY:
 961         case ICMPV6_MGM_REPORT:
 962         case ICMPV6_MGM_REDUCTION:
 963         case ICMPV6_MLD2_REPORT:
 964                 return 1;
 965         default:
 966                 break;
 967         }
 968         return 0;
 969 }
 970
 971 /*
 972  *      check if the interface/address pair is valid
 973  */
 974 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
 975         struct in6_addr *src_addr)
 976 {
 977         struct inet6_dev *idev;
 978         struct ifmcaddr6 *mc;
 979         int rv = 0;
 980
 981         idev = in6_dev_get(dev);
 982         if (idev) {
 983                 read_lock_bh(&idev->lock);
 984                 for (mc = idev->mc_list; mc; mc=mc->next) {
 985                         if (ipv6_addr_equal(&mc->mca_addr, group))
 986                                 break;
 987                 }
 988                 if (mc) {
 989                         if (src_addr && !ipv6_addr_any(src_addr)) {
 990                                 struct ip6_sf_list *psf;
 991
 992                                 spin_lock_bh(&mc->mca_lock);
 993                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 994                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 995                                                 break;
 996                                 }
 997                                 if (psf)
 998                                         rv = psf->sf_count[MCAST_INCLUDE] ||
 999                                                 psf->sf_count[MCAST_EXCLUDE] !=
1000                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1001                                 else
1002                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1003                                 spin_unlock_bh(&mc->mca_lock);
1004                         } else
1005                                 rv = 1; /* don't filter unspecified source */
1006                 }
1007                 read_unlock_bh(&idev->lock);
1008                 in6_dev_put(idev);
1009         }
1010         return rv;
1011 }
1012
1013 static void mld_gq_start_timer(struct inet6_dev *idev)
1014 {
1015         int tv = net_random() % idev->mc_maxdelay;
1016
1017         idev->mc_gq_running = 1;
1018         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1019                 in6_dev_hold(idev);
1020 }
1021
1022 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1023 {
1024         int tv = net_random() % delay;
1025
1026         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1027                 in6_dev_hold(idev);
1028 }
1029
1030 /*
1031  *      IGMP handling (alias multicast ICMPv6 messages)
1032  */
1033
1034 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1035 {
1036         unsigned long delay = resptime;
1037
1038         /* Do not start timer for these addresses */
1039         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1040             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1041                 return;
1042
1043         if (del_timer(&ma->mca_timer)) {
1044                 atomic_dec(&ma->mca_refcnt);
1045                 delay = ma->mca_timer.expires - jiffies;
1046         }
1047
1048         if (delay >= resptime) {
1049                 if (resptime)
1050                         delay = net_random() % resptime;
1051                 else
1052                         delay = 1;
1053         }
1054         ma->mca_timer.expires = jiffies + delay;
1055         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1056                 atomic_inc(&ma->mca_refcnt);
1057         ma->mca_flags |= MAF_TIMER_RUNNING;
1058 }
1059
1060 static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1061         struct in6_addr *srcs)
1062 {
1063         struct ip6_sf_list *psf;
1064         int i, scount;
1065
1066         scount = 0;
1067         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1068                 if (scount == nsrcs)
1069                         break;
1070                 for (i=0; i<nsrcs; i++)
1071                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1072                                 psf->sf_gsresp = 1;
1073                                 scount++;
1074                                 break;
1075                         }
1076         }
1077 }
1078
1079 int igmp6_event_query(struct sk_buff *skb)
1080 {
1081         struct mld2_query *mlh2 = (struct mld2_query *) skb->h.raw;
1082         struct ifmcaddr6 *ma;
1083         struct in6_addr *group;
1084         unsigned long max_delay;
1085         struct inet6_dev *idev;
1086         struct icmp6hdr *hdr;
1087         int group_type;
1088         int mark = 0;
1089         int len;
1090
1091         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1092                 return -EINVAL;
1093
1094         /* compute payload length excluding extension headers */
1095         len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1096         len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1097
1098         /* Drop queries with not link local source */
1099         if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1100                 return -EINVAL;
1101
1102         idev = in6_dev_get(skb->dev);
1103
1104         if (idev == NULL)
1105                 return 0;
1106
1107         hdr = (struct icmp6hdr *) skb->h.raw;
1108         group = (struct in6_addr *) (hdr + 1);
1109         group_type = ipv6_addr_type(group);
1110
1111         if (group_type != IPV6_ADDR_ANY &&
1112             !(group_type&IPV6_ADDR_MULTICAST)) {
1113                 in6_dev_put(idev);
1114                 return -EINVAL;
1115         }
1116
1117         if (len == 24) {
1118                 int switchback;
1119                 /* MLDv1 router present */
1120
1121                 /* Translate milliseconds to jiffies */
1122                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1123
1124                 switchback = (idev->mc_qrv + 1) * max_delay;
1125                 idev->mc_v1_seen = jiffies + switchback;
1126
1127                 /* cancel the interface change timer */
1128                 idev->mc_ifc_count = 0;
1129                 if (del_timer(&idev->mc_ifc_timer))
1130                         __in6_dev_put(idev);
1131                 /* clear deleted report items */
1132                 mld_clear_delrec(idev);
1133         } else if (len >= 28) {
1134                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1135                 if (!max_delay)
1136                         max_delay = 1;
1137                 idev->mc_maxdelay = max_delay;
1138                 if (mlh2->qrv)
1139                         idev->mc_qrv = mlh2->qrv;
1140                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1141                         if (mlh2->nsrcs) {
1142                                 in6_dev_put(idev);
1143                                 return -EINVAL; /* no sources allowed */
1144                         }
1145                         mld_gq_start_timer(idev);
1146                         in6_dev_put(idev);
1147                         return 0;
1148                 }
1149                 /* mark sources to include, if group & source-specific */
1150                 mark = mlh2->nsrcs != 0;
1151         } else {
1152                 in6_dev_put(idev);
1153                 return -EINVAL;
1154         }
1155
1156         read_lock_bh(&idev->lock);
1157         if (group_type == IPV6_ADDR_ANY) {
1158                 for (ma = idev->mc_list; ma; ma=ma->next) {
1159                         spin_lock_bh(&ma->mca_lock);
1160                         igmp6_group_queried(ma, max_delay);
1161                         spin_unlock_bh(&ma->mca_lock);
1162                 }
1163         } else {
1164                 for (ma = idev->mc_list; ma; ma=ma->next) {
1165                         if (group_type != IPV6_ADDR_ANY &&
1166                             !ipv6_addr_equal(group, &ma->mca_addr))
1167                                 continue;
1168                         spin_lock_bh(&ma->mca_lock);
1169                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1170                                 /* gsquery <- gsquery && mark */
1171                                 if (!mark)
1172                                         ma->mca_flags &= ~MAF_GSQUERY;
1173                         } else {
1174                                 /* gsquery <- mark */
1175                                 if (mark)
1176                                         ma->mca_flags |= MAF_GSQUERY;
1177                                 else
1178                                         ma->mca_flags &= ~MAF_GSQUERY;
1179                         }
1180                         if (ma->mca_flags & MAF_GSQUERY)
1181                                 mld_marksources(ma, ntohs(mlh2->nsrcs),
1182                                         mlh2->srcs);
1183                         igmp6_group_queried(ma, max_delay);
1184                         spin_unlock_bh(&ma->mca_lock);
1185                         if (group_type != IPV6_ADDR_ANY)
1186                                 break;
1187                 }
1188         }
1189         read_unlock_bh(&idev->lock);
1190         in6_dev_put(idev);
1191
1192         return 0;
1193 }
1194
1195
1196 int igmp6_event_report(struct sk_buff *skb)
1197 {
1198         struct ifmcaddr6 *ma;
1199         struct in6_addr *addrp;
1200         struct inet6_dev *idev;
1201         struct icmp6hdr *hdr;
1202         int addr_type;
1203
1204         /* Our own report looped back. Ignore it. */
1205         if (skb->pkt_type == PACKET_LOOPBACK)
1206                 return 0;
1207
1208         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1209                 return -EINVAL;
1210
1211         hdr = (struct icmp6hdr*) skb->h.raw;
1212
1213         /* Drop reports with not link local source */
1214         addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1215         if (addr_type != IPV6_ADDR_ANY &&
1216             !(addr_type&IPV6_ADDR_LINKLOCAL))
1217                 return -EINVAL;
1218
1219         addrp = (struct in6_addr *) (hdr + 1);
1220
1221         idev = in6_dev_get(skb->dev);
1222         if (idev == NULL)
1223                 return -ENODEV;
1224
1225         /*
1226          *      Cancel the timer for this group
1227          */
1228
1229         read_lock_bh(&idev->lock);
1230         for (ma = idev->mc_list; ma; ma=ma->next) {
1231                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1232                         spin_lock(&ma->mca_lock);
1233                         if (del_timer(&ma->mca_timer))
1234                                 atomic_dec(&ma->mca_refcnt);
1235                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1236                         spin_unlock(&ma->mca_lock);
1237                         break;
1238                 }
1239         }
1240         read_unlock_bh(&idev->lock);
1241         in6_dev_put(idev);
1242         return 0;
1243 }
1244
1245 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1246         int gdeleted, int sdeleted)
1247 {
1248         switch (type) {
1249         case MLD2_MODE_IS_INCLUDE:
1250         case MLD2_MODE_IS_EXCLUDE:
1251                 if (gdeleted || sdeleted)
1252                         return 0;
1253                 return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
1254         case MLD2_CHANGE_TO_INCLUDE:
1255                 if (gdeleted || sdeleted)
1256                         return 0;
1257                 return psf->sf_count[MCAST_INCLUDE] != 0;
1258         case MLD2_CHANGE_TO_EXCLUDE:
1259                 if (gdeleted || sdeleted)
1260                         return 0;
1261                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1262                     psf->sf_count[MCAST_INCLUDE])
1263                         return 0;
1264                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1265                         psf->sf_count[MCAST_EXCLUDE];
1266         case MLD2_ALLOW_NEW_SOURCES:
1267                 if (gdeleted || !psf->sf_crcount)
1268                         return 0;
1269                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1270         case MLD2_BLOCK_OLD_SOURCES:
1271                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1272                         return gdeleted || (psf->sf_crcount && sdeleted);
1273                 return psf->sf_crcount && !gdeleted && !sdeleted;
1274         }
1275         return 0;
1276 }
1277
1278 static int
1279 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1280 {
1281         struct ip6_sf_list *psf;
1282         int scount = 0;
1283
1284         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1285                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1286                         continue;
1287                 scount++;
1288         }
1289         return scount;
1290 }
1291
1292 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1293 {
1294         struct sock *sk = igmp6_socket->sk;
1295         struct sk_buff *skb;
1296         struct mld2_report *pmr;
1297         struct in6_addr addr_buf;
1298         int err;
1299         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1300                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1301                      IPV6_TLV_PADN, 0 };
1302
1303         /* we assume size > sizeof(ra) here */
1304         skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1305
1306         if (skb == 0)
1307                 return NULL;
1308
1309         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1310
1311         if (ipv6_get_lladdr(dev, &addr_buf)) {
1312                 /* <draft-ietf-magma-mld-source-05.txt>:
1313                  * use unspecified address as the source address
1314                  * when a valid link-local address is not available.
1315                  */
1316                 memset(&addr_buf, 0, sizeof(addr_buf));
1317         }
1318
1319         ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1320
1321         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1322
1323         pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1324         skb->h.raw = (unsigned char *)pmr;
1325         pmr->type = ICMPV6_MLD2_REPORT;
1326         pmr->resv1 = 0;
1327         pmr->csum = 0;
1328         pmr->resv2 = 0;
1329         pmr->ngrec = 0;
1330         return skb;
1331 }
1332
1333 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1334 {
1335         struct net_device *dev = skb->dev;
1336
1337         if (dev->hard_header) {
1338                 unsigned char ha[MAX_ADDR_LEN];
1339                 int err;
1340
1341                 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1342                 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1343                 if (err < 0) {
1344                         kfree_skb(skb);
1345                         return err;
1346                 }
1347         }
1348         return dev_queue_xmit(skb);
1349 }
1350
1351 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1352 {
1353         return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1354                        mld_dev_queue_xmit2);
1355 }
1356
1357 static void mld_sendpack(struct sk_buff *skb)
1358 {
1359         struct ipv6hdr *pip6 = skb->nh.ipv6h;
1360         struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1361         int payload_len, mldlen;
1362         struct inet6_dev *idev = in6_dev_get(skb->dev);
1363         int err;
1364
1365         IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1366         payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1367                 sizeof(struct ipv6hdr);
1368         mldlen = skb->tail - skb->h.raw;
1369         pip6->payload_len = htons(payload_len);
1370
1371         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1372                 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1373         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1374                 mld_dev_queue_xmit);
1375         if (!err) {
1376                 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1377                 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1378         } else
1379                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1380
1381         if (likely(idev != NULL))
1382                 in6_dev_put(idev);
1383 }
1384
1385 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1386 {
1387         return sizeof(struct mld2_grec) + 4*mld_scount(pmc,type,gdel,sdel);
1388 }
1389
1390 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1391         int type, struct mld2_grec **ppgr)
1392 {
1393         struct net_device *dev = pmc->idev->dev;
1394         struct mld2_report *pmr;
1395         struct mld2_grec *pgr;
1396
1397         if (!skb)
1398                 skb = mld_newpack(dev, dev->mtu);
1399         if (!skb)
1400                 return NULL;
1401         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1402         pgr->grec_type = type;
1403         pgr->grec_auxwords = 0;
1404         pgr->grec_nsrcs = 0;
1405         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1406         pmr = (struct mld2_report *)skb->h.raw;
1407         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1408         *ppgr = pgr;
1409         return skb;
1410 }
1411
1412 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1413         skb_tailroom(skb)) : 0)
1414
1415 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1416         int type, int gdeleted, int sdeleted)
1417 {
1418         struct net_device *dev = pmc->idev->dev;
1419         struct mld2_report *pmr;
1420         struct mld2_grec *pgr = NULL;
1421         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1422         int scount, first, isquery, truncate;
1423
1424         if (pmc->mca_flags & MAF_NOREPORT)
1425                 return skb;
1426
1427         isquery = type == MLD2_MODE_IS_INCLUDE ||
1428                   type == MLD2_MODE_IS_EXCLUDE;
1429         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1430                     type == MLD2_CHANGE_TO_EXCLUDE;
1431
1432         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1433
1434         if (!*psf_list) {
1435                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1436                     type == MLD2_BLOCK_OLD_SOURCES)
1437                         return skb;
1438                 if (pmc->mca_crcount || isquery) {
1439                         /* make sure we have room for group header and at
1440                          * least one source.
1441                          */
1442                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
1443                             sizeof(struct in6_addr)) {
1444                                 mld_sendpack(skb);
1445                                 skb = NULL; /* add_grhead will get a new one */
1446                         }
1447                         skb = add_grhead(skb, pmc, type, &pgr);
1448                 }
1449                 return skb;
1450         }
1451         pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1452
1453         /* EX and TO_EX get a fresh packet, if needed */
1454         if (truncate) {
1455                 if (pmr && pmr->ngrec &&
1456                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1457                         if (skb)
1458                                 mld_sendpack(skb);
1459                         skb = mld_newpack(dev, dev->mtu);
1460                 }
1461         }
1462         first = 1;
1463         scount = 0;
1464         psf_prev = NULL;
1465         for (psf=*psf_list; psf; psf=psf_next) {
1466                 struct in6_addr *psrc;
1467
1468                 psf_next = psf->sf_next;
1469
1470                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1471                         psf_prev = psf;
1472                         continue;
1473                 }
1474
1475                 /* clear marks on query responses */
1476                 if (isquery)
1477                         psf->sf_gsresp = 0;
1478
1479                 if (AVAILABLE(skb) < sizeof(*psrc) +
1480                     first*sizeof(struct mld2_grec)) {
1481                         if (truncate && !first)
1482                                 break;   /* truncate these */
1483                         if (pgr)
1484                                 pgr->grec_nsrcs = htons(scount);
1485                         if (skb)
1486                                 mld_sendpack(skb);
1487                         skb = mld_newpack(dev, dev->mtu);
1488                         first = 1;
1489                         scount = 0;
1490                 }
1491                 if (first) {
1492                         skb = add_grhead(skb, pmc, type, &pgr);
1493                         first = 0;
1494                 }
1495                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1496                 *psrc = psf->sf_addr;
1497                 scount++;
1498                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1499                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1500                         psf->sf_crcount--;
1501                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1502                                 if (psf_prev)
1503                                         psf_prev->sf_next = psf->sf_next;
1504                                 else
1505                                         *psf_list = psf->sf_next;
1506                                 kfree(psf);
1507                                 continue;
1508                         }
1509                 }
1510                 psf_prev = psf;
1511         }
1512         if (pgr)
1513                 pgr->grec_nsrcs = htons(scount);
1514
1515         if (isquery)
1516                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1517         return skb;
1518 }
1519
1520 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1521 {
1522         struct sk_buff *skb = NULL;
1523         int type;
1524
1525         if (!pmc) {
1526                 read_lock_bh(&idev->lock);
1527                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1528                         if (pmc->mca_flags & MAF_NOREPORT)
1529                                 continue;
1530                         spin_lock_bh(&pmc->mca_lock);
1531                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1532                                 type = MLD2_MODE_IS_EXCLUDE;
1533                         else
1534                                 type = MLD2_MODE_IS_INCLUDE;
1535                         skb = add_grec(skb, pmc, type, 0, 0);
1536                         spin_unlock_bh(&pmc->mca_lock);
1537                 }
1538                 read_unlock_bh(&idev->lock);
1539         } else {
1540                 spin_lock_bh(&pmc->mca_lock);
1541                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1542                         type = MLD2_MODE_IS_EXCLUDE;
1543                 else
1544                         type = MLD2_MODE_IS_INCLUDE;
1545                 skb = add_grec(skb, pmc, type, 0, 0);
1546                 spin_unlock_bh(&pmc->mca_lock);
1547         }
1548         if (skb)
1549                 mld_sendpack(skb);
1550 }
1551
1552 /*
1553  * remove zero-count source records from a source filter list
1554  */
1555 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1556 {
1557         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1558
1559         psf_prev = NULL;
1560         for (psf=*ppsf; psf; psf = psf_next) {
1561                 psf_next = psf->sf_next;
1562                 if (psf->sf_crcount == 0) {
1563                         if (psf_prev)
1564                                 psf_prev->sf_next = psf->sf_next;
1565                         else
1566                                 *ppsf = psf->sf_next;
1567                         kfree(psf);
1568                 } else
1569                         psf_prev = psf;
1570         }
1571 }
1572
1573 static void mld_send_cr(struct inet6_dev *idev)
1574 {
1575         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1576         struct sk_buff *skb = NULL;
1577         int type, dtype;
1578
1579         read_lock_bh(&idev->lock);
1580         write_lock_bh(&idev->mc_lock);
1581
1582         /* deleted MCA's */
1583         pmc_prev = NULL;
1584         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1585                 pmc_next = pmc->next;
1586                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1587                         type = MLD2_BLOCK_OLD_SOURCES;
1588                         dtype = MLD2_BLOCK_OLD_SOURCES;
1589                         skb = add_grec(skb, pmc, type, 1, 0);
1590                         skb = add_grec(skb, pmc, dtype, 1, 1);
1591                 }
1592                 if (pmc->mca_crcount) {
1593                         pmc->mca_crcount--;
1594                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1595                                 type = MLD2_CHANGE_TO_INCLUDE;
1596                                 skb = add_grec(skb, pmc, type, 1, 0);
1597                         }
1598                         if (pmc->mca_crcount == 0) {
1599                                 mld_clear_zeros(&pmc->mca_tomb);
1600                                 mld_clear_zeros(&pmc->mca_sources);
1601                         }
1602                 }
1603                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1604                     !pmc->mca_sources) {
1605                         if (pmc_prev)
1606                                 pmc_prev->next = pmc_next;
1607                         else
1608                                 idev->mc_tomb = pmc_next;
1609                         in6_dev_put(pmc->idev);
1610                         kfree(pmc);
1611                 } else
1612                         pmc_prev = pmc;
1613         }
1614         write_unlock_bh(&idev->mc_lock);
1615
1616         /* change recs */
1617         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1618                 spin_lock_bh(&pmc->mca_lock);
1619                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1620                         type = MLD2_BLOCK_OLD_SOURCES;
1621                         dtype = MLD2_ALLOW_NEW_SOURCES;
1622                 } else {
1623                         type = MLD2_ALLOW_NEW_SOURCES;
1624                         dtype = MLD2_BLOCK_OLD_SOURCES;
1625                 }
1626                 skb = add_grec(skb, pmc, type, 0, 0);
1627                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1628
1629                 /* filter mode changes */
1630                 if (pmc->mca_crcount) {
1631                         pmc->mca_crcount--;
1632                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1633                                 type = MLD2_CHANGE_TO_EXCLUDE;
1634                         else
1635                                 type = MLD2_CHANGE_TO_INCLUDE;
1636                         skb = add_grec(skb, pmc, type, 0, 0);
1637                 }
1638                 spin_unlock_bh(&pmc->mca_lock);
1639         }
1640         read_unlock_bh(&idev->lock);
1641         if (!skb)
1642                 return;
1643         (void) mld_sendpack(skb);
1644 }
1645
1646 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1647 {
1648         struct sock *sk = igmp6_socket->sk;
1649         struct inet6_dev *idev;
1650         struct sk_buff *skb;
1651         struct icmp6hdr *hdr;
1652         struct in6_addr *snd_addr;
1653         struct in6_addr *addrp;
1654         struct in6_addr addr_buf;
1655         struct in6_addr all_routers;
1656         int err, len, payload_len, full_len;
1657         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1658                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1659                      IPV6_TLV_PADN, 0 };
1660
1661         IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1662         snd_addr = addr;
1663         if (type == ICMPV6_MGM_REDUCTION) {
1664                 snd_addr = &all_routers;
1665                 ipv6_addr_all_routers(&all_routers);
1666         }
1667
1668         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1669         payload_len = len + sizeof(ra);
1670         full_len = sizeof(struct ipv6hdr) + payload_len;
1671
1672         skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1673
1674         if (skb == NULL) {
1675                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1676                 return;
1677         }
1678
1679         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1680
1681         if (ipv6_get_lladdr(dev, &addr_buf)) {
1682                 /* <draft-ietf-magma-mld-source-05.txt>:
1683                  * use unspecified address as the source address
1684                  * when a valid link-local address is not available.
1685                  */
1686                 memset(&addr_buf, 0, sizeof(addr_buf));
1687         }
1688
1689         ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1690
1691         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1692
1693         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1694         memset(hdr, 0, sizeof(struct icmp6hdr));
1695         hdr->icmp6_type = type;
1696
1697         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1698         ipv6_addr_copy(addrp, addr);
1699
1700         hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1701                                            IPPROTO_ICMPV6,
1702                                            csum_partial((__u8 *) hdr, len, 0));
1703
1704         idev = in6_dev_get(skb->dev);
1705
1706         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1707                 mld_dev_queue_xmit);
1708         if (!err) {
1709                 if (type == ICMPV6_MGM_REDUCTION)
1710                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1711                 else
1712                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1713                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1714                 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1715         } else
1716                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1717
1718         if (likely(idev != NULL))
1719                 in6_dev_put(idev);
1720         return;
1721 }
1722
1723 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1724         struct in6_addr *psfsrc)
1725 {
1726         struct ip6_sf_list *psf, *psf_prev;
1727         int rv = 0;
1728
1729         psf_prev = NULL;
1730         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1731                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1732                         break;
1733                 psf_prev = psf;
1734         }
1735         if (!psf || psf->sf_count[sfmode] == 0) {
1736                 /* source filter not found, or count wrong =>  bug */
1737                 return -ESRCH;
1738         }
1739         psf->sf_count[sfmode]--;
1740         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1741                 struct inet6_dev *idev = pmc->idev;
1742
1743                 /* no more filters for this source */
1744                 if (psf_prev)
1745                         psf_prev->sf_next = psf->sf_next;
1746                 else
1747                         pmc->mca_sources = psf->sf_next;
1748                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1749                     !MLD_V1_SEEN(idev)) {
1750                         psf->sf_crcount = idev->mc_qrv;
1751                         psf->sf_next = pmc->mca_tomb;
1752                         pmc->mca_tomb = psf;
1753                         rv = 1;
1754                 } else
1755                         kfree(psf);
1756         }
1757         return rv;
1758 }
1759
1760 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1761                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1762                           int delta)
1763 {
1764         struct ifmcaddr6 *pmc;
1765         int     changerec = 0;
1766         int     i, err;
1767
1768         if (!idev)
1769                 return -ENODEV;
1770         read_lock_bh(&idev->lock);
1771         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1772                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1773                         break;
1774         }
1775         if (!pmc) {
1776                 /* MCA not found?? bug */
1777                 read_unlock_bh(&idev->lock);
1778                 return -ESRCH;
1779         }
1780         spin_lock_bh(&pmc->mca_lock);
1781         sf_markstate(pmc);
1782         if (!delta) {
1783                 if (!pmc->mca_sfcount[sfmode]) {
1784                         spin_unlock_bh(&pmc->mca_lock);
1785                         read_unlock_bh(&idev->lock);
1786                         return -EINVAL;
1787                 }
1788                 pmc->mca_sfcount[sfmode]--;
1789         }
1790         err = 0;
1791         for (i=0; i<sfcount; i++) {
1792                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1793
1794                 changerec |= rv > 0;
1795                 if (!err && rv < 0)
1796                         err = rv;
1797         }
1798         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1799             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1800             pmc->mca_sfcount[MCAST_INCLUDE]) {
1801                 struct ip6_sf_list *psf;
1802
1803                 /* filter mode change */
1804                 pmc->mca_sfmode = MCAST_INCLUDE;
1805                 pmc->mca_crcount = idev->mc_qrv;
1806                 idev->mc_ifc_count = pmc->mca_crcount;
1807                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1808                         psf->sf_crcount = 0;
1809                 mld_ifc_event(pmc->idev);
1810         } else if (sf_setstate(pmc) || changerec)
1811                 mld_ifc_event(pmc->idev);
1812         spin_unlock_bh(&pmc->mca_lock);
1813         read_unlock_bh(&idev->lock);
1814         return err;
1815 }
1816
1817 /*
1818  * Add multicast single-source filter to the interface list
1819  */
1820 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1821         struct in6_addr *psfsrc, int delta)
1822 {
1823         struct ip6_sf_list *psf, *psf_prev;
1824
1825         psf_prev = NULL;
1826         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1827                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1828                         break;
1829                 psf_prev = psf;
1830         }
1831         if (!psf) {
1832                 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1833                 if (!psf)
1834                         return -ENOBUFS;
1835                 memset(psf, 0, sizeof(*psf));
1836                 psf->sf_addr = *psfsrc;
1837                 if (psf_prev) {
1838                         psf_prev->sf_next = psf;
1839                 } else
1840                         pmc->mca_sources = psf;
1841         }
1842         psf->sf_count[sfmode]++;
1843         return 0;
1844 }
1845
1846 static void sf_markstate(struct ifmcaddr6 *pmc)
1847 {
1848         struct ip6_sf_list *psf;
1849         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1850
1851         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1852                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1853                         psf->sf_oldin = mca_xcount ==
1854                                 psf->sf_count[MCAST_EXCLUDE] &&
1855                                 !psf->sf_count[MCAST_INCLUDE];
1856                 } else
1857                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1858 }
1859
1860 static int sf_setstate(struct ifmcaddr6 *pmc)
1861 {
1862         struct ip6_sf_list *psf;
1863         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1864         int qrv = pmc->idev->mc_qrv;
1865         int new_in, rv;
1866
1867         rv = 0;
1868         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1869                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1870                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1871                                 !psf->sf_count[MCAST_INCLUDE];
1872                 } else
1873                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1874                 if (new_in != psf->sf_oldin) {
1875                         psf->sf_crcount = qrv;
1876                         rv++;
1877                 }
1878         }
1879         return rv;
1880 }
1881
1882 /*
1883  * Add multicast source filter list to the interface list
1884  */
1885 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
1886                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1887                           int delta)
1888 {
1889         struct ifmcaddr6 *pmc;
1890         int     isexclude;
1891         int     i, err;
1892
1893         if (!idev)
1894                 return -ENODEV;
1895         read_lock_bh(&idev->lock);
1896         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1897                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1898                         break;
1899         }
1900         if (!pmc) {
1901                 /* MCA not found?? bug */
1902                 read_unlock_bh(&idev->lock);
1903                 return -ESRCH;
1904         }
1905         spin_lock_bh(&pmc->mca_lock);
1906
1907         sf_markstate(pmc);
1908         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
1909         if (!delta)
1910                 pmc->mca_sfcount[sfmode]++;
1911         err = 0;
1912         for (i=0; i<sfcount; i++) {
1913                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1914                 if (err)
1915                         break;
1916         }
1917         if (err) {
1918                 int j;
1919
1920                 if (!delta)
1921                         pmc->mca_sfcount[sfmode]--;
1922                 for (j=0; j<i; j++)
1923                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1924         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1925                 struct inet6_dev *idev = pmc->idev;
1926                 struct ip6_sf_list *psf;
1927
1928                 /* filter mode change */
1929                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1930                         pmc->mca_sfmode = MCAST_EXCLUDE;
1931                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
1932                         pmc->mca_sfmode = MCAST_INCLUDE;
1933                 /* else no filters; keep old mode for reports */
1934
1935                 pmc->mca_crcount = idev->mc_qrv;
1936                 idev->mc_ifc_count = pmc->mca_crcount;
1937                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1938                         psf->sf_crcount = 0;
1939                 mld_ifc_event(idev);
1940         } else if (sf_setstate(pmc))
1941                 mld_ifc_event(idev);
1942         spin_unlock_bh(&pmc->mca_lock);
1943         read_unlock_bh(&idev->lock);
1944         return err;
1945 }
1946
1947 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
1948 {
1949         struct ip6_sf_list *psf, *nextpsf;
1950
1951         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
1952                 nextpsf = psf->sf_next;
1953                 kfree(psf);
1954         }
1955         pmc->mca_tomb = NULL;
1956         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
1957                 nextpsf = psf->sf_next;
1958                 kfree(psf);
1959         }
1960         pmc->mca_sources = NULL;
1961         pmc->mca_sfmode = MCAST_EXCLUDE;
1962         pmc->mca_sfcount[MCAST_EXCLUDE] = 0;
1963         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
1964 }
1965
1966
1967 static void igmp6_join_group(struct ifmcaddr6 *ma)
1968 {
1969         unsigned long delay;
1970
1971         if (ma->mca_flags & MAF_NOREPORT)
1972                 return;
1973
1974         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
1975
1976         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
1977
1978         spin_lock_bh(&ma->mca_lock);
1979         if (del_timer(&ma->mca_timer)) {
1980                 atomic_dec(&ma->mca_refcnt);
1981                 delay = ma->mca_timer.expires - jiffies;
1982         }
1983
1984         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1985                 atomic_inc(&ma->mca_refcnt);
1986         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
1987         spin_unlock_bh(&ma->mca_lock);
1988 }
1989
1990 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
1991                             struct inet6_dev *idev)
1992 {
1993         int err;
1994
1995         if (iml->sflist == 0) {
1996                 /* any-source empty exclude case */
1997                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
1998         }
1999         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2000                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2001         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2002         iml->sflist = NULL;
2003         return err;
2004 }
2005
2006 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2007 {
2008         if (MLD_V1_SEEN(ma->idev)) {
2009                 if (ma->mca_flags & MAF_LAST_REPORTER)
2010                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2011                                 ICMPV6_MGM_REDUCTION);
2012         } else {
2013                 mld_add_delrec(ma->idev, ma);
2014                 mld_ifc_event(ma->idev);
2015         }
2016 }
2017
2018 static void mld_gq_timer_expire(unsigned long data)
2019 {
2020         struct inet6_dev *idev = (struct inet6_dev *)data;
2021
2022         idev->mc_gq_running = 0;
2023         mld_send_report(idev, NULL);
2024         __in6_dev_put(idev);
2025 }
2026
2027 static void mld_ifc_timer_expire(unsigned long data)
2028 {
2029         struct inet6_dev *idev = (struct inet6_dev *)data;
2030
2031         mld_send_cr(idev);
2032         if (idev->mc_ifc_count) {
2033                 idev->mc_ifc_count--;
2034                 if (idev->mc_ifc_count)
2035                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2036         }
2037         __in6_dev_put(idev);
2038 }
2039
2040 static void mld_ifc_event(struct inet6_dev *idev)
2041 {
2042         if (MLD_V1_SEEN(idev))
2043                 return;
2044         idev->mc_ifc_count = idev->mc_qrv;
2045         mld_ifc_start_timer(idev, 1);
2046 }
2047
2048
2049 static void igmp6_timer_handler(unsigned long data)
2050 {
2051         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2052
2053         if (MLD_V1_SEEN(ma->idev))
2054                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2055         else
2056                 mld_send_report(ma->idev, ma);
2057
2058         spin_lock(&ma->mca_lock);
2059         ma->mca_flags |=  MAF_LAST_REPORTER;
2060         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2061         spin_unlock(&ma->mca_lock);
2062         ma_put(ma);
2063 }
2064
2065 /* Device going down */
2066
2067 void ipv6_mc_down(struct inet6_dev *idev)
2068 {
2069         struct ifmcaddr6 *i;
2070
2071         /* Withdraw multicast list */
2072
2073         read_lock_bh(&idev->lock);
2074         idev->mc_ifc_count = 0;
2075         if (del_timer(&idev->mc_ifc_timer))
2076                 __in6_dev_put(idev);
2077         idev->mc_gq_running = 0;
2078         if (del_timer(&idev->mc_gq_timer))
2079                 __in6_dev_put(idev);
2080
2081         for (i = idev->mc_list; i; i=i->next)
2082                 igmp6_group_dropped(i);
2083         read_unlock_bh(&idev->lock);
2084
2085         mld_clear_delrec(idev);
2086 }
2087
2088
2089 /* Device going up */
2090
2091 void ipv6_mc_up(struct inet6_dev *idev)
2092 {
2093         struct ifmcaddr6 *i;
2094
2095         /* Install multicast list, except for all-nodes (already installed) */
2096
2097         read_lock_bh(&idev->lock);
2098         for (i = idev->mc_list; i; i=i->next)
2099                 igmp6_group_added(i);
2100         read_unlock_bh(&idev->lock);
2101 }
2102
2103 /* IPv6 device initialization. */
2104
2105 void ipv6_mc_init_dev(struct inet6_dev *idev)
2106 {
2107         struct in6_addr maddr;
2108
2109         write_lock_bh(&idev->lock);
2110         rwlock_init(&idev->mc_lock);
2111         idev->mc_gq_running = 0;
2112         init_timer(&idev->mc_gq_timer);
2113         idev->mc_gq_timer.data = (unsigned long) idev;
2114         idev->mc_gq_timer.function = &mld_gq_timer_expire;
2115         idev->mc_tomb = NULL;
2116         idev->mc_ifc_count = 0;
2117         init_timer(&idev->mc_ifc_timer);
2118         idev->mc_ifc_timer.data = (unsigned long) idev;
2119         idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2120         idev->mc_qrv = MLD_QRV_DEFAULT;
2121         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2122         idev->mc_v1_seen = 0;
2123         write_unlock_bh(&idev->lock);
2124
2125         /* Add all-nodes address. */
2126         ipv6_addr_all_nodes(&maddr);
2127         ipv6_dev_mc_inc(idev->dev, &maddr);
2128 }
2129
2130 /*
2131  *      Device is about to be destroyed: clean up.
2132  */
2133
2134 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2135 {
2136         struct ifmcaddr6 *i;
2137         struct in6_addr maddr;
2138
2139         /* Deactivate timers */
2140         ipv6_mc_down(idev);
2141
2142         /* Delete all-nodes address. */
2143         ipv6_addr_all_nodes(&maddr);
2144
2145         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2146          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2147          * fail.
2148          */
2149         __ipv6_dev_mc_dec(idev, &maddr);
2150
2151         if (idev->cnf.forwarding) {
2152                 ipv6_addr_all_routers(&maddr);
2153                 __ipv6_dev_mc_dec(idev, &maddr);
2154         }
2155
2156         write_lock_bh(&idev->lock);
2157         while ((i = idev->mc_list) != NULL) {
2158                 idev->mc_list = i->next;
2159                 write_unlock_bh(&idev->lock);
2160
2161                 igmp6_group_dropped(i);
2162                 ma_put(i);
2163
2164                 write_lock_bh(&idev->lock);
2165         }
2166         write_unlock_bh(&idev->lock);
2167 }
2168
2169 #ifdef CONFIG_PROC_FS
2170 struct igmp6_mc_iter_state {
2171         struct net_device *dev;
2172         struct inet6_dev *idev;
2173 };
2174
2175 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2176
2177 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2178 {
2179         struct ifmcaddr6 *im = NULL;
2180         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2181
2182         for (state->dev = dev_base, state->idev = NULL;
2183              state->dev;
2184              state->dev = state->dev->next) {
2185                 struct inet6_dev *idev;
2186                 idev = in6_dev_get(state->dev);
2187                 if (!idev)
2188                         continue;
2189                 read_lock_bh(&idev->lock);
2190                 im = idev->mc_list;
2191                 if (im) {
2192                         state->idev = idev;
2193                         break;
2194                 }
2195                 read_unlock_bh(&idev->lock);
2196                 in6_dev_put(idev);
2197         }
2198         return im;
2199 }
2200
2201 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2202 {
2203         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2204
2205         im = im->next;
2206         while (!im) {
2207                 if (likely(state->idev != NULL)) {
2208                         read_unlock_bh(&state->idev->lock);
2209                         in6_dev_put(state->idev);
2210                 }
2211                 state->dev = state->dev->next;
2212                 if (!state->dev) {
2213                         state->idev = NULL;
2214                         break;
2215                 }
2216                 state->idev = in6_dev_get(state->dev);
2217                 if (!state->idev)
2218                         continue;
2219                 read_lock_bh(&state->idev->lock);
2220                 im = state->idev->mc_list;
2221         }
2222         return im;
2223 }
2224
2225 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2226 {
2227         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2228         if (im)
2229                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2230                         --pos;
2231         return pos ? NULL : im;
2232 }
2233
2234 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2235 {
2236         read_lock(&dev_base_lock);
2237         return igmp6_mc_get_idx(seq, *pos);
2238 }
2239
2240 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2241 {
2242         struct ifmcaddr6 *im;
2243         im = igmp6_mc_get_next(seq, v);
2244         ++*pos;
2245         return im;
2246 }
2247
2248 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2249 {
2250         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2251         if (likely(state->idev != NULL)) {
2252                 read_unlock_bh(&state->idev->lock);
2253                 in6_dev_put(state->idev);
2254                 state->idev = NULL;
2255         }
2256         state->dev = NULL;
2257         read_unlock(&dev_base_lock);
2258 }
2259
2260 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2261 {
2262         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2263         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2264
2265         seq_printf(seq,
2266                    "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n",
2267                    state->dev->ifindex, state->dev->name,
2268                    NIP6(im->mca_addr),
2269                    im->mca_users, im->mca_flags,
2270                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2271                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2272         return 0;
2273 }
2274
2275 static struct seq_operations igmp6_mc_seq_ops = {
2276         .start  =       igmp6_mc_seq_start,
2277         .next   =       igmp6_mc_seq_next,
2278         .stop   =       igmp6_mc_seq_stop,
2279         .show   =       igmp6_mc_seq_show,
2280 };
2281
2282 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2283 {
2284         struct seq_file *seq;
2285         int rc = -ENOMEM;
2286         struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2287
2288         if (!s)
2289                 goto out;
2290
2291         rc = seq_open(file, &igmp6_mc_seq_ops);
2292         if (rc)
2293                 goto out_kfree;
2294
2295         seq = file->private_data;
2296         seq->private = s;
2297         memset(s, 0, sizeof(*s));
2298 out:
2299         return rc;
2300 out_kfree:
2301         kfree(s);
2302         goto out;
2303 }
2304
2305 static struct file_operations igmp6_mc_seq_fops = {
2306         .owner          =       THIS_MODULE,
2307         .open           =       igmp6_mc_seq_open,
2308         .read           =       seq_read,
2309         .llseek         =       seq_lseek,
2310         .release        =       seq_release_private,
2311 };
2312
2313 struct igmp6_mcf_iter_state {
2314         struct net_device *dev;
2315         struct inet6_dev *idev;
2316         struct ifmcaddr6 *im;
2317 };
2318
2319 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2320
2321 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2322 {
2323         struct ip6_sf_list *psf = NULL;
2324         struct ifmcaddr6 *im = NULL;
2325         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2326
2327         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2328              state->dev;
2329              state->dev = state->dev->next) {
2330                 struct inet6_dev *idev;
2331                 idev = in6_dev_get(state->dev);
2332                 if (unlikely(idev == NULL))
2333                         continue;
2334                 read_lock_bh(&idev->lock);
2335                 im = idev->mc_list;
2336                 if (likely(im != NULL)) {
2337                         spin_lock_bh(&im->mca_lock);
2338                         psf = im->mca_sources;
2339                         if (likely(psf != NULL)) {
2340                                 state->im = im;
2341                                 state->idev = idev;
2342                                 break;
2343                         }
2344                         spin_unlock_bh(&im->mca_lock);
2345                 }
2346                 read_unlock_bh(&idev->lock);
2347                 in6_dev_put(idev);
2348         }
2349         return psf;
2350 }
2351
2352 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2353 {
2354         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2355
2356         psf = psf->sf_next;
2357         while (!psf) {
2358                 spin_unlock_bh(&state->im->mca_lock);
2359                 state->im = state->im->next;
2360                 while (!state->im) {
2361                         if (likely(state->idev != NULL)) {
2362                                 read_unlock_bh(&state->idev->lock);
2363                                 in6_dev_put(state->idev);
2364                         }
2365                         state->dev = state->dev->next;
2366                         if (!state->dev) {
2367                                 state->idev = NULL;
2368                                 goto out;
2369                         }
2370                         state->idev = in6_dev_get(state->dev);
2371                         if (!state->idev)
2372                                 continue;
2373                         read_lock_bh(&state->idev->lock);
2374                         state->im = state->idev->mc_list;
2375                 }
2376                 if (!state->im)
2377                         break;
2378                 spin_lock_bh(&state->im->mca_lock);
2379                 psf = state->im->mca_sources;
2380         }
2381 out:
2382         return psf;
2383 }
2384
2385 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2386 {
2387         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2388         if (psf)
2389                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2390                         --pos;
2391         return pos ? NULL : psf;
2392 }
2393
2394 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2395 {
2396         read_lock(&dev_base_lock);
2397         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2398 }
2399
2400 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2401 {
2402         struct ip6_sf_list *psf;
2403         if (v == SEQ_START_TOKEN)
2404                 psf = igmp6_mcf_get_first(seq);
2405         else
2406                 psf = igmp6_mcf_get_next(seq, v);
2407         ++*pos;
2408         return psf;
2409 }
2410
2411 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2412 {
2413         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2414         if (likely(state->im != NULL)) {
2415                 spin_unlock_bh(&state->im->mca_lock);
2416                 state->im = NULL;
2417         }
2418         if (likely(state->idev != NULL)) {
2419                 read_unlock_bh(&state->idev->lock);
2420                 in6_dev_put(state->idev);
2421                 state->idev = NULL;
2422         }
2423         state->dev = NULL;
2424         read_unlock(&dev_base_lock);
2425 }
2426
2427 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2428 {
2429         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2430         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2431
2432         if (v == SEQ_START_TOKEN) {
2433                 seq_printf(seq,
2434                            "%3s %6s "
2435                            "%32s %32s %6s %6s\n", "Idx",
2436                            "Device", "Multicast Address",
2437                            "Source Address", "INC", "EXC");
2438         } else {
2439                 seq_printf(seq,
2440                            "%3d %6.6s "
2441                            "%04x%04x%04x%04x%04x%04x%04x%04x "
2442                            "%04x%04x%04x%04x%04x%04x%04x%04x "
2443                            "%6lu %6lu\n",
2444                            state->dev->ifindex, state->dev->name,
2445                            NIP6(state->im->mca_addr),
2446                            NIP6(psf->sf_addr),
2447                            psf->sf_count[MCAST_INCLUDE],
2448                            psf->sf_count[MCAST_EXCLUDE]);
2449         }
2450         return 0;
2451 }
2452
2453 static struct seq_operations igmp6_mcf_seq_ops = {
2454         .start  =       igmp6_mcf_seq_start,
2455         .next   =       igmp6_mcf_seq_next,
2456         .stop   =       igmp6_mcf_seq_stop,
2457         .show   =       igmp6_mcf_seq_show,
2458 };
2459
2460 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2461 {
2462         struct seq_file *seq;
2463         int rc = -ENOMEM;
2464         struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2465
2466         if (!s)
2467                 goto out;
2468
2469         rc = seq_open(file, &igmp6_mcf_seq_ops);
2470         if (rc)
2471                 goto out_kfree;
2472
2473         seq = file->private_data;
2474         seq->private = s;
2475         memset(s, 0, sizeof(*s));
2476 out:
2477         return rc;
2478 out_kfree:
2479         kfree(s);
2480         goto out;
2481 }
2482
2483 static struct file_operations igmp6_mcf_seq_fops = {
2484         .owner          =       THIS_MODULE,
2485         .open           =       igmp6_mcf_seq_open,
2486         .read           =       seq_read,
2487         .llseek         =       seq_lseek,
2488         .release        =       seq_release_private,
2489 };
2490 #endif
2491
2492 int __init igmp6_init(struct net_proto_family *ops)
2493 {
2494         struct ipv6_pinfo *np;
2495         struct sock *sk;
2496         int err;
2497
2498         err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2499         if (err < 0) {
2500                 printk(KERN_ERR
2501                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2502                        err);
2503                 igmp6_socket = NULL; /* For safety. */
2504                 return err;
2505         }
2506
2507         sk = igmp6_socket->sk;
2508         sk->sk_allocation = GFP_ATOMIC;
2509         sk->sk_prot->unhash(sk);
2510
2511         np = inet6_sk(sk);
2512         np->hop_limit = 1;
2513
2514 #ifdef CONFIG_PROC_FS
2515         proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2516         proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2517 #endif
2518
2519         return 0;
2520 }
2521
2522 void igmp6_cleanup(void)
2523 {
2524         sock_release(igmp6_socket);
2525         igmp6_socket = NULL; /* for safety */
2526
2527 #ifdef CONFIG_PROC_FS
2528         proc_net_remove("mcfilter6");
2529         proc_net_remove("igmp6");
2530 #endif
2531 }