net/ipv6/mcast.c

   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))) << \
 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        64
 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         rwlock_init(&mc_lst->sflock);
 228         mc_lst->sflist = NULL;
 229
 230         /*
 231          *      now add/increase the group membership on the device
 232          */
 233
 234         err = ipv6_dev_mc_inc(dev, addr);
 235
 236         if (err) {
 237                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 238                 dev_put(dev);
 239                 return err;
 240         }
 241
 242         write_lock_bh(&ipv6_sk_mc_lock);
 243         mc_lst->next = np->ipv6_mc_list;
 244         np->ipv6_mc_list = mc_lst;
 245         write_unlock_bh(&ipv6_sk_mc_lock);
 246
 247         dev_put(dev);
 248
 249         return 0;
 250 }
 251
 252 /*
 253  *      socket leave on multicast group
 254  */
 255 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 256 {
 257         struct ipv6_pinfo *np = inet6_sk(sk);
 258         struct ipv6_mc_socklist *mc_lst, **lnk;
 259
 260         write_lock_bh(&ipv6_sk_mc_lock);
 261         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 262                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 263                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 264                         struct net_device *dev;
 265
 266                         *lnk = mc_lst->next;
 267                         write_unlock_bh(&ipv6_sk_mc_lock);
 268
 269                         if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
 270                                 struct inet6_dev *idev = in6_dev_get(dev);
 271
 272                                 if (idev) {
 273                                         (void) ip6_mc_leave_src(sk,mc_lst,idev);
 274                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 275                                         in6_dev_put(idev);
 276                                 }
 277                                 dev_put(dev);
 278                         }
 279                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 280                         return 0;
 281                 }
 282         }
 283         write_unlock_bh(&ipv6_sk_mc_lock);
 284
 285         return -EADDRNOTAVAIL;
 286 }
 287
 288 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
 289 {
 290         struct net_device *dev = NULL;
 291         struct inet6_dev *idev = NULL;
 292
 293         if (ifindex == 0) {
 294                 struct rt6_info *rt;
 295
 296                 rt = rt6_lookup(group, NULL, 0, 0);
 297                 if (rt) {
 298                         dev = rt->rt6i_dev;
 299                         dev_hold(dev);
 300                         dst_release(&rt->u.dst);
 301                 }
 302         } else
 303                 dev = dev_get_by_index(ifindex);
 304
 305         if (!dev)
 306                 return NULL;
 307         idev = in6_dev_get(dev);
 308         if (!idev) {
 309                 dev_put(dev);
 310                 return NULL;
 311         }
 312         read_lock_bh(&idev->lock);
 313         if (idev->dead) {
 314                 read_unlock_bh(&idev->lock);
 315                 in6_dev_put(idev);
 316                 dev_put(dev);
 317                 return NULL;
 318         }
 319         return idev;
 320 }
 321
 322 void ipv6_sock_mc_close(struct sock *sk)
 323 {
 324         struct ipv6_pinfo *np = inet6_sk(sk);
 325         struct ipv6_mc_socklist *mc_lst;
 326
 327         write_lock_bh(&ipv6_sk_mc_lock);
 328         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 329                 struct net_device *dev;
 330
 331                 np->ipv6_mc_list = mc_lst->next;
 332                 write_unlock_bh(&ipv6_sk_mc_lock);
 333
 334                 dev = dev_get_by_index(mc_lst->ifindex);
 335                 if (dev) {
 336                         struct inet6_dev *idev = in6_dev_get(dev);
 337
 338                         if (idev) {
 339                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 340                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 341                                 in6_dev_put(idev);
 342                         }
 343                         dev_put(dev);
 344                 }
 345
 346                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 347
 348                 write_lock_bh(&ipv6_sk_mc_lock);
 349         }
 350         write_unlock_bh(&ipv6_sk_mc_lock);
 351 }
 352
 353 int ip6_mc_source(int add, int omode, struct sock *sk,
 354         struct group_source_req *pgsr)
 355 {
 356         struct in6_addr *source, *group;
 357         struct ipv6_mc_socklist *pmc;
 358         struct net_device *dev;
 359         struct inet6_dev *idev;
 360         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 361         struct ip6_sf_socklist *psl;
 362         int i, j, rv;
 363         int leavegroup = 0;
 364         int pmclocked = 0;
 365         int err;
 366
 367         if (pgsr->gsr_group.ss_family != AF_INET6 ||
 368             pgsr->gsr_source.ss_family != AF_INET6)
 369                 return -EINVAL;
 370
 371         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 372         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 373
 374         if (!ipv6_addr_is_multicast(group))
 375                 return -EINVAL;
 376
 377         idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
 378         if (!idev)
 379                 return -ENODEV;
 380         dev = idev->dev;
 381
 382         err = -EADDRNOTAVAIL;
 383
 384         read_lock_bh(&ipv6_sk_mc_lock);
 385         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 386                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 387                         continue;
 388                 if (ipv6_addr_equal(&pmc->addr, group))
 389                         break;
 390         }
 391         if (!pmc) {             /* must have a prior join */
 392                 err = -EINVAL;
 393                 goto done;
 394         }
 395         /* if a source filter was set, must be the same mode as before */
 396         if (pmc->sflist) {
 397                 if (pmc->sfmode != omode) {
 398                         err = -EINVAL;
 399                         goto done;
 400                 }
 401         } else if (pmc->sfmode != omode) {
 402                 /* allow mode switches for empty-set filters */
 403                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 404                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 405                 pmc->sfmode = omode;
 406         }
 407
 408         write_lock_bh(&pmc->sflock);
 409         pmclocked = 1;
 410
 411         psl = pmc->sflist;
 412         if (!add) {
 413                 if (!psl)
 414                         goto done;      /* err = -EADDRNOTAVAIL */
 415                 rv = !0;
 416                 for (i=0; i<psl->sl_count; i++) {
 417                         rv = memcmp(&psl->sl_addr[i], source,
 418                                 sizeof(struct in6_addr));
 419                         if (rv == 0)
 420                                 break;
 421                 }
 422                 if (rv)         /* source not found */
 423                         goto done;      /* err = -EADDRNOTAVAIL */
 424
 425                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 426                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 427                         leavegroup = 1;
 428                         goto done;
 429                 }
 430
 431                 /* update the interface filter */
 432                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 433
 434                 for (j=i+1; j<psl->sl_count; j++)
 435                         psl->sl_addr[j-1] = psl->sl_addr[j];
 436                 psl->sl_count--;
 437                 err = 0;
 438                 goto done;
 439         }
 440         /* else, add a new source to the filter */
 441
 442         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 443                 err = -ENOBUFS;
 444                 goto done;
 445         }
 446         if (!psl || psl->sl_count == psl->sl_max) {
 447                 struct ip6_sf_socklist *newpsl;
 448                 int count = IP6_SFBLOCK;
 449
 450                 if (psl)
 451                         count += psl->sl_max;
 452                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 453                 if (!newpsl) {
 454                         err = -ENOBUFS;
 455                         goto done;
 456                 }
 457                 newpsl->sl_max = count;
 458                 newpsl->sl_count = count - IP6_SFBLOCK;
 459                 if (psl) {
 460                         for (i=0; i<psl->sl_count; i++)
 461                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 462                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 463                 }
 464                 pmc->sflist = psl = newpsl;
 465         }
 466         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 467         for (i=0; i<psl->sl_count; i++) {
 468                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 469                 if (rv == 0)
 470                         break;
 471         }
 472         if (rv == 0)            /* address already there is an error */
 473                 goto done;
 474         for (j=psl->sl_count-1; j>=i; j--)
 475                 psl->sl_addr[j+1] = psl->sl_addr[j];
 476         psl->sl_addr[i] = *source;
 477         psl->sl_count++;
 478         err = 0;
 479         /* update the interface list */
 480         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 481 done:
 482         if (pmclocked)
 483                 write_unlock_bh(&pmc->sflock);
 484         read_unlock_bh(&ipv6_sk_mc_lock);
 485         read_unlock_bh(&idev->lock);
 486         in6_dev_put(idev);
 487         dev_put(dev);
 488         if (leavegroup)
 489                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 490         return err;
 491 }
 492
 493 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 494 {
 495         struct in6_addr *group;
 496         struct ipv6_mc_socklist *pmc;
 497         struct net_device *dev;
 498         struct inet6_dev *idev;
 499         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 500         struct ip6_sf_socklist *newpsl, *psl;
 501         int leavegroup = 0;
 502         int i, err;
 503
 504         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 505
 506         if (!ipv6_addr_is_multicast(group))
 507                 return -EINVAL;
 508         if (gsf->gf_fmode != MCAST_INCLUDE &&
 509             gsf->gf_fmode != MCAST_EXCLUDE)
 510                 return -EINVAL;
 511
 512         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 513
 514         if (!idev)
 515                 return -ENODEV;
 516         dev = idev->dev;
 517
 518         err = 0;
 519         read_lock_bh(&ipv6_sk_mc_lock);
 520
 521         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 522                 leavegroup = 1;
 523                 goto done;
 524         }
 525
 526         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 527                 if (pmc->ifindex != gsf->gf_interface)
 528                         continue;
 529                 if (ipv6_addr_equal(&pmc->addr, group))
 530                         break;
 531         }
 532         if (!pmc) {             /* must have a prior join */
 533                 err = -EINVAL;
 534                 goto done;
 535         }
 536         if (gsf->gf_numsrc) {
 537                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 538                                                           GFP_ATOMIC);
 539                 if (!newpsl) {
 540                         err = -ENOBUFS;
 541                         goto done;
 542                 }
 543                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 544                 for (i=0; i<newpsl->sl_count; ++i) {
 545                         struct sockaddr_in6 *psin6;
 546
 547                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 548                         newpsl->sl_addr[i] = psin6->sin6_addr;
 549                 }
 550                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 551                         newpsl->sl_count, newpsl->sl_addr, 0);
 552                 if (err) {
 553                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 554                         goto done;
 555                 }
 556         } else {
 557                 newpsl = NULL;
 558                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 559         }
 560
 561         write_lock_bh(&pmc->sflock);
 562         psl = pmc->sflist;
 563         if (psl) {
 564                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 565                         psl->sl_count, psl->sl_addr, 0);
 566                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 567         } else
 568                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 569         pmc->sflist = newpsl;
 570         pmc->sfmode = gsf->gf_fmode;
 571         write_unlock_bh(&pmc->sflock);
 572         err = 0;
 573 done:
 574         read_unlock_bh(&ipv6_sk_mc_lock);
 575         read_unlock_bh(&idev->lock);
 576         in6_dev_put(idev);
 577         dev_put(dev);
 578         if (leavegroup)
 579                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 580         return err;
 581 }
 582
 583 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 584         struct group_filter __user *optval, int __user *optlen)
 585 {
 586         int err, i, count, copycount;
 587         struct in6_addr *group;
 588         struct ipv6_mc_socklist *pmc;
 589         struct inet6_dev *idev;
 590         struct net_device *dev;
 591         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 592         struct ip6_sf_socklist *psl;
 593
 594         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 595
 596         if (!ipv6_addr_is_multicast(group))
 597                 return -EINVAL;
 598
 599         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 600
 601         if (!idev)
 602                 return -ENODEV;
 603
 604         dev = idev->dev;
 605
 606         err = -EADDRNOTAVAIL;
 607         /*
 608          * changes to the ipv6_mc_list require the socket lock and
 609          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 610          * so reading the list is safe.
 611          */
 612
 613         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 614                 if (pmc->ifindex != gsf->gf_interface)
 615                         continue;
 616                 if (ipv6_addr_equal(group, &pmc->addr))
 617                         break;
 618         }
 619         if (!pmc)               /* must have a prior join */
 620                 goto done;
 621         gsf->gf_fmode = pmc->sfmode;
 622         psl = pmc->sflist;
 623         count = psl ? psl->sl_count : 0;
 624         read_unlock_bh(&idev->lock);
 625         in6_dev_put(idev);
 626         dev_put(dev);
 627
 628         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 629         gsf->gf_numsrc = count;
 630         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 631             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 632                 return -EFAULT;
 633         }
 634         /* changes to psl require the socket lock, a read lock on
 635          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 636          * have the socket lock, so reading here is safe.
 637          */
 638         for (i=0; i<copycount; i++) {
 639                 struct sockaddr_in6 *psin6;
 640                 struct sockaddr_storage ss;
 641
 642                 psin6 = (struct sockaddr_in6 *)&ss;
 643                 memset(&ss, 0, sizeof(ss));
 644                 psin6->sin6_family = AF_INET6;
 645                 psin6->sin6_addr = psl->sl_addr[i];
 646                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 647                         return -EFAULT;
 648         }
 649         return 0;
 650 done:
 651         read_unlock_bh(&idev->lock);
 652         in6_dev_put(idev);
 653         dev_put(dev);
 654         return err;
 655 }
 656
 657 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
 658         struct in6_addr *src_addr)
 659 {
 660         struct ipv6_pinfo *np = inet6_sk(sk);
 661         struct ipv6_mc_socklist *mc;
 662         struct ip6_sf_socklist *psl;
 663         int rv = 1;
 664
 665         read_lock(&ipv6_sk_mc_lock);
 666         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 667                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 668                         break;
 669         }
 670         if (!mc) {
 671                 read_unlock(&ipv6_sk_mc_lock);
 672                 return 1;
 673         }
 674         read_lock(&mc->sflock);
 675         psl = mc->sflist;
 676         if (!psl) {
 677                 rv = mc->sfmode == MCAST_EXCLUDE;
 678         } else {
 679                 int i;
 680
 681                 for (i=0; i<psl->sl_count; i++) {
 682                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 683                                 break;
 684                 }
 685                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 686                         rv = 0;
 687                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 688                         rv = 0;
 689         }
 690         read_unlock(&mc->sflock);
 691         read_unlock(&ipv6_sk_mc_lock);
 692
 693         return rv;
 694 }
 695
 696 static void ma_put(struct ifmcaddr6 *mc)
 697 {
 698         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 699                 in6_dev_put(mc->idev);
 700                 kfree(mc);
 701         }
 702 }
 703
 704 static void igmp6_group_added(struct ifmcaddr6 *mc)
 705 {
 706         struct net_device *dev = mc->idev->dev;
 707         char buf[MAX_ADDR_LEN];
 708
 709         spin_lock_bh(&mc->mca_lock);
 710         if (!(mc->mca_flags&MAF_LOADED)) {
 711                 mc->mca_flags |= MAF_LOADED;
 712                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 713                         dev_mc_add(dev, buf, dev->addr_len, 0);
 714         }
 715         spin_unlock_bh(&mc->mca_lock);
 716
 717         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 718                 return;
 719
 720         if (MLD_V1_SEEN(mc->idev)) {
 721                 igmp6_join_group(mc);
 722                 return;
 723         }
 724         /* else v2 */
 725
 726         mc->mca_crcount = mc->idev->mc_qrv;
 727         mld_ifc_event(mc->idev);
 728 }
 729
 730 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 731 {
 732         struct net_device *dev = mc->idev->dev;
 733         char buf[MAX_ADDR_LEN];
 734
 735         spin_lock_bh(&mc->mca_lock);
 736         if (mc->mca_flags&MAF_LOADED) {
 737                 mc->mca_flags &= ~MAF_LOADED;
 738                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 739                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 740         }
 741
 742         if (mc->mca_flags & MAF_NOREPORT)
 743                 goto done;
 744         spin_unlock_bh(&mc->mca_lock);
 745
 746         if (!mc->idev->dead)
 747                 igmp6_leave_group(mc);
 748
 749         spin_lock_bh(&mc->mca_lock);
 750         if (del_timer(&mc->mca_timer))
 751                 atomic_dec(&mc->mca_refcnt);
 752 done:
 753         ip6_mc_clear_src(mc);
 754         spin_unlock_bh(&mc->mca_lock);
 755 }
 756
 757 /*
 758  * deleted ifmcaddr6 manipulation
 759  */
 760 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 761 {
 762         struct ifmcaddr6 *pmc;
 763
 764         /* this is an "ifmcaddr6" for convenience; only the fields below
 765          * are actually used. In particular, the refcnt and users are not
 766          * used for management of the delete list. Using the same structure
 767          * for deleted items allows change reports to use common code with
 768          * non-deleted or query-response MCA's.
 769          */
 770         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 771         if (!pmc)
 772                 return;
 773
 774         spin_lock_bh(&im->mca_lock);
 775         spin_lock_init(&pmc->mca_lock);
 776         pmc->idev = im->idev;
 777         in6_dev_hold(idev);
 778         pmc->mca_addr = im->mca_addr;
 779         pmc->mca_crcount = idev->mc_qrv;
 780         pmc->mca_sfmode = im->mca_sfmode;
 781         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 782                 struct ip6_sf_list *psf;
 783
 784                 pmc->mca_tomb = im->mca_tomb;
 785                 pmc->mca_sources = im->mca_sources;
 786                 im->mca_tomb = im->mca_sources = NULL;
 787                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 788                         psf->sf_crcount = pmc->mca_crcount;
 789         }
 790         spin_unlock_bh(&im->mca_lock);
 791
 792         write_lock_bh(&idev->mc_lock);
 793         pmc->next = idev->mc_tomb;
 794         idev->mc_tomb = pmc;
 795         write_unlock_bh(&idev->mc_lock);
 796 }
 797
 798 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 799 {
 800         struct ifmcaddr6 *pmc, *pmc_prev;
 801         struct ip6_sf_list *psf, *psf_next;
 802
 803         write_lock_bh(&idev->mc_lock);
 804         pmc_prev = NULL;
 805         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 806                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 807                         break;
 808                 pmc_prev = pmc;
 809         }
 810         if (pmc) {
 811                 if (pmc_prev)
 812                         pmc_prev->next = pmc->next;
 813                 else
 814                         idev->mc_tomb = pmc->next;
 815         }
 816         write_unlock_bh(&idev->mc_lock);
 817         if (pmc) {
 818                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 819                         psf_next = psf->sf_next;
 820                         kfree(psf);
 821                 }
 822                 in6_dev_put(pmc->idev);
 823                 kfree(pmc);
 824         }
 825 }
 826
 827 static void mld_clear_delrec(struct inet6_dev *idev)
 828 {
 829         struct ifmcaddr6 *pmc, *nextpmc;
 830
 831         write_lock_bh(&idev->mc_lock);
 832         pmc = idev->mc_tomb;
 833         idev->mc_tomb = NULL;
 834         write_unlock_bh(&idev->mc_lock);
 835
 836         for (; pmc; pmc = nextpmc) {
 837                 nextpmc = pmc->next;
 838                 ip6_mc_clear_src(pmc);
 839                 in6_dev_put(pmc->idev);
 840                 kfree(pmc);
 841         }
 842
 843         /* clear dead sources, too */
 844         read_lock_bh(&idev->lock);
 845         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 846                 struct ip6_sf_list *psf, *psf_next;
 847
 848                 spin_lock_bh(&pmc->mca_lock);
 849                 psf = pmc->mca_tomb;
 850                 pmc->mca_tomb = NULL;
 851                 spin_unlock_bh(&pmc->mca_lock);
 852                 for (; psf; psf=psf_next) {
 853                         psf_next = psf->sf_next;
 854                         kfree(psf);
 855                 }
 856         }
 857         read_unlock_bh(&idev->lock);
 858 }
 859
 860
 861 /*
 862  *      device multicast group inc (add if not found)
 863  */
 864 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
 865 {
 866         struct ifmcaddr6 *mc;
 867         struct inet6_dev *idev;
 868
 869         idev = in6_dev_get(dev);
 870
 871         if (idev == NULL)
 872                 return -EINVAL;
 873
 874         write_lock_bh(&idev->lock);
 875         if (idev->dead) {
 876                 write_unlock_bh(&idev->lock);
 877                 in6_dev_put(idev);
 878                 return -ENODEV;
 879         }
 880
 881         for (mc = idev->mc_list; mc; mc = mc->next) {
 882                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 883                         mc->mca_users++;
 884                         write_unlock_bh(&idev->lock);
 885                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 886                                 NULL, 0);
 887                         in6_dev_put(idev);
 888                         return 0;
 889                 }
 890         }
 891
 892         /*
 893          *      not found: create a new one.
 894          */
 895
 896         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 897
 898         if (mc == NULL) {
 899                 write_unlock_bh(&idev->lock);
 900                 in6_dev_put(idev);
 901                 return -ENOMEM;
 902         }
 903
 904         init_timer(&mc->mca_timer);
 905         mc->mca_timer.function = igmp6_timer_handler;
 906         mc->mca_timer.data = (unsigned long) mc;
 907
 908         ipv6_addr_copy(&mc->mca_addr, addr);
 909         mc->idev = idev;
 910         mc->mca_users = 1;
 911         /* mca_stamp should be updated upon changes */
 912         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 913         atomic_set(&mc->mca_refcnt, 2);
 914         spin_lock_init(&mc->mca_lock);
 915
 916         /* initial mode is (EX, empty) */
 917         mc->mca_sfmode = MCAST_EXCLUDE;
 918         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 919
 920         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 921             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 922                 mc->mca_flags |= MAF_NOREPORT;
 923
 924         mc->next = idev->mc_list;
 925         idev->mc_list = mc;
 926         write_unlock_bh(&idev->lock);
 927
 928         mld_del_delrec(idev, &mc->mca_addr);
 929         igmp6_group_added(mc);
 930         ma_put(mc);
 931         return 0;
 932 }
 933
 934 /*
 935  *      device multicast group del
 936  */
 937 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
 938 {
 939         struct ifmcaddr6 *ma, **map;
 940
 941         write_lock_bh(&idev->lock);
 942         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 943                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 944                         if (--ma->mca_users == 0) {
 945                                 *map = ma->next;
 946                                 write_unlock_bh(&idev->lock);
 947
 948                                 igmp6_group_dropped(ma);
 949
 950                                 ma_put(ma);
 951                                 return 0;
 952                         }
 953                         write_unlock_bh(&idev->lock);
 954                         return 0;
 955                 }
 956         }
 957         write_unlock_bh(&idev->lock);
 958
 959         return -ENOENT;
 960 }
 961
 962 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
 963 {
 964         struct inet6_dev *idev = in6_dev_get(dev);
 965         int err;
 966
 967         if (!idev)
 968                 return -ENODEV;
 969
 970         err = __ipv6_dev_mc_dec(idev, addr);
 971
 972         in6_dev_put(idev);
 973
 974         return err;
 975 }
 976
 977 /*
 978  * identify MLD packets for MLD filter exceptions
 979  */
 980 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 981 {
 982         struct icmp6hdr *pic;
 983
 984         if (nexthdr != IPPROTO_ICMPV6)
 985                 return 0;
 986
 987         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 988                 return 0;
 989
 990         pic = (struct icmp6hdr *)skb->h.raw;
 991
 992         switch (pic->icmp6_type) {
 993         case ICMPV6_MGM_QUERY:
 994         case ICMPV6_MGM_REPORT:
 995         case ICMPV6_MGM_REDUCTION:
 996         case ICMPV6_MLD2_REPORT:
 997                 return 1;
 998         default:
 999                 break;
1000         }
1001         return 0;
1002 }
1003
1004 /*
1005  *      check if the interface/address pair is valid
1006  */
1007 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1008         struct in6_addr *src_addr)
1009 {
1010         struct inet6_dev *idev;
1011         struct ifmcaddr6 *mc;
1012         int rv = 0;
1013
1014         idev = in6_dev_get(dev);
1015         if (idev) {
1016                 read_lock_bh(&idev->lock);
1017                 for (mc = idev->mc_list; mc; mc=mc->next) {
1018                         if (ipv6_addr_equal(&mc->mca_addr, group))
1019                                 break;
1020                 }
1021                 if (mc) {
1022                         if (src_addr && !ipv6_addr_any(src_addr)) {
1023                                 struct ip6_sf_list *psf;
1024
1025                                 spin_lock_bh(&mc->mca_lock);
1026                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1027                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1028                                                 break;
1029                                 }
1030                                 if (psf)
1031                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1032                                                 psf->sf_count[MCAST_EXCLUDE] !=
1033                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1034                                 else
1035                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1036                                 spin_unlock_bh(&mc->mca_lock);
1037                         } else
1038                                 rv = 1; /* don't filter unspecified source */
1039                 }
1040                 read_unlock_bh(&idev->lock);
1041                 in6_dev_put(idev);
1042         }
1043         return rv;
1044 }
1045
1046 static void mld_gq_start_timer(struct inet6_dev *idev)
1047 {
1048         int tv = net_random() % idev->mc_maxdelay;
1049
1050         idev->mc_gq_running = 1;
1051         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1052                 in6_dev_hold(idev);
1053 }
1054
1055 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1056 {
1057         int tv = net_random() % delay;
1058
1059         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1060                 in6_dev_hold(idev);
1061 }
1062
1063 /*
1064  *      IGMP handling (alias multicast ICMPv6 messages)
1065  */
1066
1067 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1068 {
1069         unsigned long delay = resptime;
1070
1071         /* Do not start timer for these addresses */
1072         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1073             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1074                 return;
1075
1076         if (del_timer(&ma->mca_timer)) {
1077                 atomic_dec(&ma->mca_refcnt);
1078                 delay = ma->mca_timer.expires - jiffies;
1079         }
1080
1081         if (delay >= resptime) {
1082                 if (resptime)
1083                         delay = net_random() % resptime;
1084                 else
1085                         delay = 1;
1086         }
1087         ma->mca_timer.expires = jiffies + delay;
1088         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1089                 atomic_inc(&ma->mca_refcnt);
1090         ma->mca_flags |= MAF_TIMER_RUNNING;
1091 }
1092
1093 /* mark EXCLUDE-mode sources */
1094 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1095         struct in6_addr *srcs)
1096 {
1097         struct ip6_sf_list *psf;
1098         int i, scount;
1099
1100         scount = 0;
1101         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1102                 if (scount == nsrcs)
1103                         break;
1104                 for (i=0; i<nsrcs; i++) {
1105                         /* skip inactive filters */
1106                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1107                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1108                             psf->sf_count[MCAST_EXCLUDE])
1109                                 continue;
1110                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1111                                 scount++;
1112                                 break;
1113                         }
1114                 }
1115         }
1116         pmc->mca_flags &= ~MAF_GSQUERY;
1117         if (scount == nsrcs)    /* all sources excluded */
1118                 return 0;
1119         return 1;
1120 }
1121
1122 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1123         struct in6_addr *srcs)
1124 {
1125         struct ip6_sf_list *psf;
1126         int i, scount;
1127
1128         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1129                 return mld_xmarksources(pmc, nsrcs, srcs);
1130
1131         /* mark INCLUDE-mode sources */
1132
1133         scount = 0;
1134         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1135                 if (scount == nsrcs)
1136                         break;
1137                 for (i=0; i<nsrcs; i++) {
1138                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1139                                 psf->sf_gsresp = 1;
1140                                 scount++;
1141                                 break;
1142                         }
1143                 }
1144         }
1145         if (!scount) {
1146                 pmc->mca_flags &= ~MAF_GSQUERY;
1147                 return 0;
1148         }
1149         pmc->mca_flags |= MAF_GSQUERY;
1150         return 1;
1151 }
1152
1153 int igmp6_event_query(struct sk_buff *skb)
1154 {
1155         struct mld2_query *mlh2 = NULL;
1156         struct ifmcaddr6 *ma;
1157         struct in6_addr *group;
1158         unsigned long max_delay;
1159         struct inet6_dev *idev;
1160         struct icmp6hdr *hdr;
1161         int group_type;
1162         int mark = 0;
1163         int len;
1164
1165         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1166                 return -EINVAL;
1167
1168         /* compute payload length excluding extension headers */
1169         len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1170         len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1171
1172         /* Drop queries with not link local source */
1173         if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1174                 return -EINVAL;
1175
1176         idev = in6_dev_get(skb->dev);
1177
1178         if (idev == NULL)
1179                 return 0;
1180
1181         hdr = (struct icmp6hdr *) skb->h.raw;
1182         group = (struct in6_addr *) (hdr + 1);
1183         group_type = ipv6_addr_type(group);
1184
1185         if (group_type != IPV6_ADDR_ANY &&
1186             !(group_type&IPV6_ADDR_MULTICAST)) {
1187                 in6_dev_put(idev);
1188                 return -EINVAL;
1189         }
1190
1191         if (len == 24) {
1192                 int switchback;
1193                 /* MLDv1 router present */
1194
1195                 /* Translate milliseconds to jiffies */
1196                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1197
1198                 switchback = (idev->mc_qrv + 1) * max_delay;
1199                 idev->mc_v1_seen = jiffies + switchback;
1200
1201                 /* cancel the interface change timer */
1202                 idev->mc_ifc_count = 0;
1203                 if (del_timer(&idev->mc_ifc_timer))
1204                         __in6_dev_put(idev);
1205                 /* clear deleted report items */
1206                 mld_clear_delrec(idev);
1207         } else if (len >= 28) {
1208                 int srcs_offset = sizeof(struct mld2_query) -
1209                                   sizeof(struct icmp6hdr);
1210                 if (!pskb_may_pull(skb, srcs_offset)) {
1211                         in6_dev_put(idev);
1212                         return -EINVAL;
1213                 }
1214                 mlh2 = (struct mld2_query *) skb->h.raw;
1215                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1216                 if (!max_delay)
1217                         max_delay = 1;
1218                 idev->mc_maxdelay = max_delay;
1219                 if (mlh2->qrv)
1220                         idev->mc_qrv = mlh2->qrv;
1221                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1222                         if (mlh2->nsrcs) {
1223                                 in6_dev_put(idev);
1224                                 return -EINVAL; /* no sources allowed */
1225                         }
1226                         mld_gq_start_timer(idev);
1227                         in6_dev_put(idev);
1228                         return 0;
1229                 }
1230                 /* mark sources to include, if group & source-specific */
1231                 if (mlh2->nsrcs != 0) {
1232                         if (!pskb_may_pull(skb, srcs_offset +
1233                             ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1234                                 in6_dev_put(idev);
1235                                 return -EINVAL;
1236                         }
1237                         mlh2 = (struct mld2_query *) skb->h.raw;
1238                         mark = 1;
1239                 }
1240         } else {
1241                 in6_dev_put(idev);
1242                 return -EINVAL;
1243         }
1244
1245         read_lock_bh(&idev->lock);
1246         if (group_type == IPV6_ADDR_ANY) {
1247                 for (ma = idev->mc_list; ma; ma=ma->next) {
1248                         spin_lock_bh(&ma->mca_lock);
1249                         igmp6_group_queried(ma, max_delay);
1250                         spin_unlock_bh(&ma->mca_lock);
1251                 }
1252         } else {
1253                 for (ma = idev->mc_list; ma; ma=ma->next) {
1254                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1255                                 continue;
1256                         spin_lock_bh(&ma->mca_lock);
1257                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1258                                 /* gsquery <- gsquery && mark */
1259                                 if (!mark)
1260                                         ma->mca_flags &= ~MAF_GSQUERY;
1261                         } else {
1262                                 /* gsquery <- mark */
1263                                 if (mark)
1264                                         ma->mca_flags |= MAF_GSQUERY;
1265                                 else
1266                                         ma->mca_flags &= ~MAF_GSQUERY;
1267                         }
1268                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1269                             mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1270                                 igmp6_group_queried(ma, max_delay);
1271                         spin_unlock_bh(&ma->mca_lock);
1272                         break;
1273                 }
1274         }
1275         read_unlock_bh(&idev->lock);
1276         in6_dev_put(idev);
1277
1278         return 0;
1279 }
1280
1281
1282 int igmp6_event_report(struct sk_buff *skb)
1283 {
1284         struct ifmcaddr6 *ma;
1285         struct in6_addr *addrp;
1286         struct inet6_dev *idev;
1287         struct icmp6hdr *hdr;
1288         int addr_type;
1289
1290         /* Our own report looped back. Ignore it. */
1291         if (skb->pkt_type == PACKET_LOOPBACK)
1292                 return 0;
1293
1294         /* send our report if the MC router may not have heard this report */
1295         if (skb->pkt_type != PACKET_MULTICAST &&
1296             skb->pkt_type != PACKET_BROADCAST)
1297                 return 0;
1298
1299         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1300                 return -EINVAL;
1301
1302         hdr = (struct icmp6hdr*) skb->h.raw;
1303
1304         /* Drop reports with not link local source */
1305         addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1306         if (addr_type != IPV6_ADDR_ANY &&
1307             !(addr_type&IPV6_ADDR_LINKLOCAL))
1308                 return -EINVAL;
1309
1310         addrp = (struct in6_addr *) (hdr + 1);
1311
1312         idev = in6_dev_get(skb->dev);
1313         if (idev == NULL)
1314                 return -ENODEV;
1315
1316         /*
1317          *      Cancel the timer for this group
1318          */
1319
1320         read_lock_bh(&idev->lock);
1321         for (ma = idev->mc_list; ma; ma=ma->next) {
1322                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1323                         spin_lock(&ma->mca_lock);
1324                         if (del_timer(&ma->mca_timer))
1325                                 atomic_dec(&ma->mca_refcnt);
1326                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1327                         spin_unlock(&ma->mca_lock);
1328                         break;
1329                 }
1330         }
1331         read_unlock_bh(&idev->lock);
1332         in6_dev_put(idev);
1333         return 0;
1334 }
1335
1336 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1337         int gdeleted, int sdeleted)
1338 {
1339         switch (type) {
1340         case MLD2_MODE_IS_INCLUDE:
1341         case MLD2_MODE_IS_EXCLUDE:
1342                 if (gdeleted || sdeleted)
1343                         return 0;
1344                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1345                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1346                                 return 1;
1347                         /* don't include if this source is excluded
1348                          * in all filters
1349                          */
1350                         if (psf->sf_count[MCAST_INCLUDE])
1351                                 return type == MLD2_MODE_IS_INCLUDE;
1352                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1353                                 psf->sf_count[MCAST_EXCLUDE];
1354                 }
1355                 return 0;
1356         case MLD2_CHANGE_TO_INCLUDE:
1357                 if (gdeleted || sdeleted)
1358                         return 0;
1359                 return psf->sf_count[MCAST_INCLUDE] != 0;
1360         case MLD2_CHANGE_TO_EXCLUDE:
1361                 if (gdeleted || sdeleted)
1362                         return 0;
1363                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1364                     psf->sf_count[MCAST_INCLUDE])
1365                         return 0;
1366                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1367                         psf->sf_count[MCAST_EXCLUDE];
1368         case MLD2_ALLOW_NEW_SOURCES:
1369                 if (gdeleted || !psf->sf_crcount)
1370                         return 0;
1371                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1372         case MLD2_BLOCK_OLD_SOURCES:
1373                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1374                         return gdeleted || (psf->sf_crcount && sdeleted);
1375                 return psf->sf_crcount && !gdeleted && !sdeleted;
1376         }
1377         return 0;
1378 }
1379
1380 static int
1381 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1382 {
1383         struct ip6_sf_list *psf;
1384         int scount = 0;
1385
1386         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1387                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1388                         continue;
1389                 scount++;
1390         }
1391         return scount;
1392 }
1393
1394 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1395 {
1396         struct sock *sk = igmp6_socket->sk;
1397         struct sk_buff *skb;
1398         struct mld2_report *pmr;
1399         struct in6_addr addr_buf;
1400         int err;
1401         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1402                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1403                      IPV6_TLV_PADN, 0 };
1404
1405         /* we assume size > sizeof(ra) here */
1406         skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1407
1408         if (skb == 0)
1409                 return NULL;
1410
1411         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1412
1413         if (ipv6_get_lladdr(dev, &addr_buf)) {
1414                 /* <draft-ietf-magma-mld-source-05.txt>:
1415                  * use unspecified address as the source address
1416                  * when a valid link-local address is not available.
1417                  */
1418                 memset(&addr_buf, 0, sizeof(addr_buf));
1419         }
1420
1421         ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1422
1423         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1424
1425         pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1426         skb->h.raw = (unsigned char *)pmr;
1427         pmr->type = ICMPV6_MLD2_REPORT;
1428         pmr->resv1 = 0;
1429         pmr->csum = 0;
1430         pmr->resv2 = 0;
1431         pmr->ngrec = 0;
1432         return skb;
1433 }
1434
1435 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1436 {
1437         struct net_device *dev = skb->dev;
1438
1439         if (dev->hard_header) {
1440                 unsigned char ha[MAX_ADDR_LEN];
1441                 int err;
1442
1443                 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1444                 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1445                 if (err < 0) {
1446                         kfree_skb(skb);
1447                         return err;
1448                 }
1449         }
1450         return dev_queue_xmit(skb);
1451 }
1452
1453 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1454 {
1455         return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1456                        mld_dev_queue_xmit2);
1457 }
1458
1459 static void mld_sendpack(struct sk_buff *skb)
1460 {
1461         struct ipv6hdr *pip6 = skb->nh.ipv6h;
1462         struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1463         int payload_len, mldlen;
1464         struct inet6_dev *idev = in6_dev_get(skb->dev);
1465         int err;
1466
1467         IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1468         payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1469                 sizeof(struct ipv6hdr);
1470         mldlen = skb->tail - skb->h.raw;
1471         pip6->payload_len = htons(payload_len);
1472
1473         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1474                 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1475         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1476                 mld_dev_queue_xmit);
1477         if (!err) {
1478                 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1479                 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1480         } else
1481                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1482
1483         if (likely(idev != NULL))
1484                 in6_dev_put(idev);
1485 }
1486
1487 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1488 {
1489         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1490 }
1491
1492 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1493         int type, struct mld2_grec **ppgr)
1494 {
1495         struct net_device *dev = pmc->idev->dev;
1496         struct mld2_report *pmr;
1497         struct mld2_grec *pgr;
1498
1499         if (!skb)
1500                 skb = mld_newpack(dev, dev->mtu);
1501         if (!skb)
1502                 return NULL;
1503         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1504         pgr->grec_type = type;
1505         pgr->grec_auxwords = 0;
1506         pgr->grec_nsrcs = 0;
1507         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1508         pmr = (struct mld2_report *)skb->h.raw;
1509         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1510         *ppgr = pgr;
1511         return skb;
1512 }
1513
1514 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1515         skb_tailroom(skb)) : 0)
1516
1517 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1518         int type, int gdeleted, int sdeleted)
1519 {
1520         struct net_device *dev = pmc->idev->dev;
1521         struct mld2_report *pmr;
1522         struct mld2_grec *pgr = NULL;
1523         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1524         int scount, stotal, first, isquery, truncate;
1525
1526         if (pmc->mca_flags & MAF_NOREPORT)
1527                 return skb;
1528
1529         isquery = type == MLD2_MODE_IS_INCLUDE ||
1530                   type == MLD2_MODE_IS_EXCLUDE;
1531         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1532                     type == MLD2_CHANGE_TO_EXCLUDE;
1533
1534         stotal = scount = 0;
1535
1536         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1537
1538         if (!*psf_list)
1539                 goto empty_source;
1540
1541         pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1542
1543         /* EX and TO_EX get a fresh packet, if needed */
1544         if (truncate) {
1545                 if (pmr && pmr->ngrec &&
1546                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1547                         if (skb)
1548                                 mld_sendpack(skb);
1549                         skb = mld_newpack(dev, dev->mtu);
1550                 }
1551         }
1552         first = 1;
1553         psf_prev = NULL;
1554         for (psf=*psf_list; psf; psf=psf_next) {
1555                 struct in6_addr *psrc;
1556
1557                 psf_next = psf->sf_next;
1558
1559                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1560                         psf_prev = psf;
1561                         continue;
1562                 }
1563
1564                 /* clear marks on query responses */
1565                 if (isquery)
1566                         psf->sf_gsresp = 0;
1567
1568                 if (AVAILABLE(skb) < sizeof(*psrc) +
1569                     first*sizeof(struct mld2_grec)) {
1570                         if (truncate && !first)
1571                                 break;   /* truncate these */
1572                         if (pgr)
1573                                 pgr->grec_nsrcs = htons(scount);
1574                         if (skb)
1575                                 mld_sendpack(skb);
1576                         skb = mld_newpack(dev, dev->mtu);
1577                         first = 1;
1578                         scount = 0;
1579                 }
1580                 if (first) {
1581                         skb = add_grhead(skb, pmc, type, &pgr);
1582                         first = 0;
1583                 }
1584                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1585                 *psrc = psf->sf_addr;
1586                 scount++; stotal++;
1587                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1588                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1589                         psf->sf_crcount--;
1590                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1591                                 if (psf_prev)
1592                                         psf_prev->sf_next = psf->sf_next;
1593                                 else
1594                                         *psf_list = psf->sf_next;
1595                                 kfree(psf);
1596                                 continue;
1597                         }
1598                 }
1599                 psf_prev = psf;
1600         }
1601
1602 empty_source:
1603         if (!stotal) {
1604                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1605                     type == MLD2_BLOCK_OLD_SOURCES)
1606                         return skb;
1607                 if (pmc->mca_crcount || isquery) {
1608                         /* make sure we have room for group header */
1609                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1610                                 mld_sendpack(skb);
1611                                 skb = NULL; /* add_grhead will get a new one */
1612                         }
1613                         skb = add_grhead(skb, pmc, type, &pgr);
1614                 }
1615         }
1616         if (pgr)
1617                 pgr->grec_nsrcs = htons(scount);
1618
1619         if (isquery)
1620                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1621         return skb;
1622 }
1623
1624 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1625 {
1626         struct sk_buff *skb = NULL;
1627         int type;
1628
1629         if (!pmc) {
1630                 read_lock_bh(&idev->lock);
1631                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1632                         if (pmc->mca_flags & MAF_NOREPORT)
1633                                 continue;
1634                         spin_lock_bh(&pmc->mca_lock);
1635                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1636                                 type = MLD2_MODE_IS_EXCLUDE;
1637                         else
1638                                 type = MLD2_MODE_IS_INCLUDE;
1639                         skb = add_grec(skb, pmc, type, 0, 0);
1640                         spin_unlock_bh(&pmc->mca_lock);
1641                 }
1642                 read_unlock_bh(&idev->lock);
1643         } else {
1644                 spin_lock_bh(&pmc->mca_lock);
1645                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1646                         type = MLD2_MODE_IS_EXCLUDE;
1647                 else
1648                         type = MLD2_MODE_IS_INCLUDE;
1649                 skb = add_grec(skb, pmc, type, 0, 0);
1650                 spin_unlock_bh(&pmc->mca_lock);
1651         }
1652         if (skb)
1653                 mld_sendpack(skb);
1654 }
1655
1656 /*
1657  * remove zero-count source records from a source filter list
1658  */
1659 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1660 {
1661         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1662
1663         psf_prev = NULL;
1664         for (psf=*ppsf; psf; psf = psf_next) {
1665                 psf_next = psf->sf_next;
1666                 if (psf->sf_crcount == 0) {
1667                         if (psf_prev)
1668                                 psf_prev->sf_next = psf->sf_next;
1669                         else
1670                                 *ppsf = psf->sf_next;
1671                         kfree(psf);
1672                 } else
1673                         psf_prev = psf;
1674         }
1675 }
1676
1677 static void mld_send_cr(struct inet6_dev *idev)
1678 {
1679         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1680         struct sk_buff *skb = NULL;
1681         int type, dtype;
1682
1683         read_lock_bh(&idev->lock);
1684         write_lock_bh(&idev->mc_lock);
1685
1686         /* deleted MCA's */
1687         pmc_prev = NULL;
1688         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1689                 pmc_next = pmc->next;
1690                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1691                         type = MLD2_BLOCK_OLD_SOURCES;
1692                         dtype = MLD2_BLOCK_OLD_SOURCES;
1693                         skb = add_grec(skb, pmc, type, 1, 0);
1694                         skb = add_grec(skb, pmc, dtype, 1, 1);
1695                 }
1696                 if (pmc->mca_crcount) {
1697                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1698                                 type = MLD2_CHANGE_TO_INCLUDE;
1699                                 skb = add_grec(skb, pmc, type, 1, 0);
1700                         }
1701                         pmc->mca_crcount--;
1702                         if (pmc->mca_crcount == 0) {
1703                                 mld_clear_zeros(&pmc->mca_tomb);
1704                                 mld_clear_zeros(&pmc->mca_sources);
1705                         }
1706                 }
1707                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1708                     !pmc->mca_sources) {
1709                         if (pmc_prev)
1710                                 pmc_prev->next = pmc_next;
1711                         else
1712                                 idev->mc_tomb = pmc_next;
1713                         in6_dev_put(pmc->idev);
1714                         kfree(pmc);
1715                 } else
1716                         pmc_prev = pmc;
1717         }
1718         write_unlock_bh(&idev->mc_lock);
1719
1720         /* change recs */
1721         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1722                 spin_lock_bh(&pmc->mca_lock);
1723                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1724                         type = MLD2_BLOCK_OLD_SOURCES;
1725                         dtype = MLD2_ALLOW_NEW_SOURCES;
1726                 } else {
1727                         type = MLD2_ALLOW_NEW_SOURCES;
1728                         dtype = MLD2_BLOCK_OLD_SOURCES;
1729                 }
1730                 skb = add_grec(skb, pmc, type, 0, 0);
1731                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1732
1733                 /* filter mode changes */
1734                 if (pmc->mca_crcount) {
1735                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1736                                 type = MLD2_CHANGE_TO_EXCLUDE;
1737                         else
1738                                 type = MLD2_CHANGE_TO_INCLUDE;
1739                         skb = add_grec(skb, pmc, type, 0, 0);
1740                         pmc->mca_crcount--;
1741                 }
1742                 spin_unlock_bh(&pmc->mca_lock);
1743         }
1744         read_unlock_bh(&idev->lock);
1745         if (!skb)
1746                 return;
1747         (void) mld_sendpack(skb);
1748 }
1749
1750 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1751 {
1752         struct sock *sk = igmp6_socket->sk;
1753         struct inet6_dev *idev;
1754         struct sk_buff *skb;
1755         struct icmp6hdr *hdr;
1756         struct in6_addr *snd_addr;
1757         struct in6_addr *addrp;
1758         struct in6_addr addr_buf;
1759         struct in6_addr all_routers;
1760         int err, len, payload_len, full_len;
1761         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1762                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1763                      IPV6_TLV_PADN, 0 };
1764
1765         IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1766         snd_addr = addr;
1767         if (type == ICMPV6_MGM_REDUCTION) {
1768                 snd_addr = &all_routers;
1769                 ipv6_addr_all_routers(&all_routers);
1770         }
1771
1772         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1773         payload_len = len + sizeof(ra);
1774         full_len = sizeof(struct ipv6hdr) + payload_len;
1775
1776         skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1777
1778         if (skb == NULL) {
1779                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1780                 return;
1781         }
1782
1783         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1784
1785         if (ipv6_get_lladdr(dev, &addr_buf)) {
1786                 /* <draft-ietf-magma-mld-source-05.txt>:
1787                  * use unspecified address as the source address
1788                  * when a valid link-local address is not available.
1789                  */
1790                 memset(&addr_buf, 0, sizeof(addr_buf));
1791         }
1792
1793         ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1794
1795         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1796
1797         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1798         memset(hdr, 0, sizeof(struct icmp6hdr));
1799         hdr->icmp6_type = type;
1800
1801         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1802         ipv6_addr_copy(addrp, addr);
1803
1804         hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1805                                            IPPROTO_ICMPV6,
1806                                            csum_partial((__u8 *) hdr, len, 0));
1807
1808         idev = in6_dev_get(skb->dev);
1809
1810         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1811                 mld_dev_queue_xmit);
1812         if (!err) {
1813                 if (type == ICMPV6_MGM_REDUCTION)
1814                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1815                 else
1816                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1817                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1818                 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1819         } else
1820                 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1821
1822         if (likely(idev != NULL))
1823                 in6_dev_put(idev);
1824         return;
1825 }
1826
1827 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1828         struct in6_addr *psfsrc)
1829 {
1830         struct ip6_sf_list *psf, *psf_prev;
1831         int rv = 0;
1832
1833         psf_prev = NULL;
1834         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1835                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1836                         break;
1837                 psf_prev = psf;
1838         }
1839         if (!psf || psf->sf_count[sfmode] == 0) {
1840                 /* source filter not found, or count wrong =>  bug */
1841                 return -ESRCH;
1842         }
1843         psf->sf_count[sfmode]--;
1844         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1845                 struct inet6_dev *idev = pmc->idev;
1846
1847                 /* no more filters for this source */
1848                 if (psf_prev)
1849                         psf_prev->sf_next = psf->sf_next;
1850                 else
1851                         pmc->mca_sources = psf->sf_next;
1852                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1853                     !MLD_V1_SEEN(idev)) {
1854                         psf->sf_crcount = idev->mc_qrv;
1855                         psf->sf_next = pmc->mca_tomb;
1856                         pmc->mca_tomb = psf;
1857                         rv = 1;
1858                 } else
1859                         kfree(psf);
1860         }
1861         return rv;
1862 }
1863
1864 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1865                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1866                           int delta)
1867 {
1868         struct ifmcaddr6 *pmc;
1869         int     changerec = 0;
1870         int     i, err;
1871
1872         if (!idev)
1873                 return -ENODEV;
1874         read_lock_bh(&idev->lock);
1875         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1876                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1877                         break;
1878         }
1879         if (!pmc) {
1880                 /* MCA not found?? bug */
1881                 read_unlock_bh(&idev->lock);
1882                 return -ESRCH;
1883         }
1884         spin_lock_bh(&pmc->mca_lock);
1885         sf_markstate(pmc);
1886         if (!delta) {
1887                 if (!pmc->mca_sfcount[sfmode]) {
1888                         spin_unlock_bh(&pmc->mca_lock);
1889                         read_unlock_bh(&idev->lock);
1890                         return -EINVAL;
1891                 }
1892                 pmc->mca_sfcount[sfmode]--;
1893         }
1894         err = 0;
1895         for (i=0; i<sfcount; i++) {
1896                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1897
1898                 changerec |= rv > 0;
1899                 if (!err && rv < 0)
1900                         err = rv;
1901         }
1902         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1903             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1904             pmc->mca_sfcount[MCAST_INCLUDE]) {
1905                 struct ip6_sf_list *psf;
1906
1907                 /* filter mode change */
1908                 pmc->mca_sfmode = MCAST_INCLUDE;
1909                 pmc->mca_crcount = idev->mc_qrv;
1910                 idev->mc_ifc_count = pmc->mca_crcount;
1911                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1912                         psf->sf_crcount = 0;
1913                 mld_ifc_event(pmc->idev);
1914         } else if (sf_setstate(pmc) || changerec)
1915                 mld_ifc_event(pmc->idev);
1916         spin_unlock_bh(&pmc->mca_lock);
1917         read_unlock_bh(&idev->lock);
1918         return err;
1919 }
1920
1921 /*
1922  * Add multicast single-source filter to the interface list
1923  */
1924 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1925         struct in6_addr *psfsrc, int delta)
1926 {
1927         struct ip6_sf_list *psf, *psf_prev;
1928
1929         psf_prev = NULL;
1930         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1931                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1932                         break;
1933                 psf_prev = psf;
1934         }
1935         if (!psf) {
1936                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1937                 if (!psf)
1938                         return -ENOBUFS;
1939
1940                 psf->sf_addr = *psfsrc;
1941                 if (psf_prev) {
1942                         psf_prev->sf_next = psf;
1943                 } else
1944                         pmc->mca_sources = psf;
1945         }
1946         psf->sf_count[sfmode]++;
1947         return 0;
1948 }
1949
1950 static void sf_markstate(struct ifmcaddr6 *pmc)
1951 {
1952         struct ip6_sf_list *psf;
1953         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1954
1955         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1956                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1957                         psf->sf_oldin = mca_xcount ==
1958                                 psf->sf_count[MCAST_EXCLUDE] &&
1959                                 !psf->sf_count[MCAST_INCLUDE];
1960                 } else
1961                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1962 }
1963
1964 static int sf_setstate(struct ifmcaddr6 *pmc)
1965 {
1966         struct ip6_sf_list *psf, *dpsf;
1967         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1968         int qrv = pmc->idev->mc_qrv;
1969         int new_in, rv;
1970
1971         rv = 0;
1972         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1973                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1974                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1975                                 !psf->sf_count[MCAST_INCLUDE];
1976                 } else
1977                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1978                 if (new_in) {
1979                         if (!psf->sf_oldin) {
1980                                 struct ip6_sf_list *prev = NULL;
1981
1982                                 for (dpsf=pmc->mca_tomb; dpsf;
1983                                      dpsf=dpsf->sf_next) {
1984                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1985                                             &psf->sf_addr))
1986                                                 break;
1987                                         prev = dpsf;
1988                                 }
1989                                 if (dpsf) {
1990                                         if (prev)
1991                                                 prev->sf_next = dpsf->sf_next;
1992                                         else
1993                                                 pmc->mca_tomb = dpsf->sf_next;
1994                                         kfree(dpsf);
1995                                 }
1996                                 psf->sf_crcount = qrv;
1997                                 rv++;
1998                         }
1999                 } else if (psf->sf_oldin) {
2000                         psf->sf_crcount = 0;
2001                         /*
2002                          * add or update "delete" records if an active filter
2003                          * is now inactive
2004                          */
2005                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2006                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2007                                     &psf->sf_addr))
2008                                         break;
2009                         if (!dpsf) {
2010                                 dpsf = (struct ip6_sf_list *)
2011                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2012                                 if (!dpsf)
2013                                         continue;
2014                                 *dpsf = *psf;
2015                                 /* pmc->mca_lock held by callers */
2016                                 dpsf->sf_next = pmc->mca_tomb;
2017                                 pmc->mca_tomb = dpsf;
2018                         }
2019                         dpsf->sf_crcount = qrv;
2020                         rv++;
2021                 }
2022         }
2023         return rv;
2024 }
2025
2026 /*
2027  * Add multicast source filter list to the interface list
2028  */
2029 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2030                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2031                           int delta)
2032 {
2033         struct ifmcaddr6 *pmc;
2034         int     isexclude;
2035         int     i, err;
2036
2037         if (!idev)
2038                 return -ENODEV;
2039         read_lock_bh(&idev->lock);
2040         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2041                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2042                         break;
2043         }
2044         if (!pmc) {
2045                 /* MCA not found?? bug */
2046                 read_unlock_bh(&idev->lock);
2047                 return -ESRCH;
2048         }
2049         spin_lock_bh(&pmc->mca_lock);
2050
2051         sf_markstate(pmc);
2052         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2053         if (!delta)
2054                 pmc->mca_sfcount[sfmode]++;
2055         err = 0;
2056         for (i=0; i<sfcount; i++) {
2057                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2058                 if (err)
2059                         break;
2060         }
2061         if (err) {
2062                 int j;
2063
2064                 if (!delta)
2065                         pmc->mca_sfcount[sfmode]--;
2066                 for (j=0; j<i; j++)
2067                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2068         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2069                 struct inet6_dev *idev = pmc->idev;
2070                 struct ip6_sf_list *psf;
2071
2072                 /* filter mode change */
2073                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2074                         pmc->mca_sfmode = MCAST_EXCLUDE;
2075                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2076                         pmc->mca_sfmode = MCAST_INCLUDE;
2077                 /* else no filters; keep old mode for reports */
2078
2079                 pmc->mca_crcount = idev->mc_qrv;
2080                 idev->mc_ifc_count = pmc->mca_crcount;
2081                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2082                         psf->sf_crcount = 0;
2083                 mld_ifc_event(idev);
2084         } else if (sf_setstate(pmc))
2085                 mld_ifc_event(idev);
2086         spin_unlock_bh(&pmc->mca_lock);
2087         read_unlock_bh(&idev->lock);
2088         return err;
2089 }
2090
2091 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2092 {
2093         struct ip6_sf_list *psf, *nextpsf;
2094
2095         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2096                 nextpsf = psf->sf_next;
2097                 kfree(psf);
2098         }
2099         pmc->mca_tomb = NULL;
2100         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2101                 nextpsf = psf->sf_next;
2102                 kfree(psf);
2103         }
2104         pmc->mca_sources = NULL;
2105         pmc->mca_sfmode = MCAST_EXCLUDE;
2106         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2107         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2108 }
2109
2110
2111 static void igmp6_join_group(struct ifmcaddr6 *ma)
2112 {
2113         unsigned long delay;
2114
2115         if (ma->mca_flags & MAF_NOREPORT)
2116                 return;
2117
2118         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2119
2120         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2121
2122         spin_lock_bh(&ma->mca_lock);
2123         if (del_timer(&ma->mca_timer)) {
2124                 atomic_dec(&ma->mca_refcnt);
2125                 delay = ma->mca_timer.expires - jiffies;
2126         }
2127
2128         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2129                 atomic_inc(&ma->mca_refcnt);
2130         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2131         spin_unlock_bh(&ma->mca_lock);
2132 }
2133
2134 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2135                             struct inet6_dev *idev)
2136 {
2137         int err;
2138
2139         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2140          * so no other readers or writers of iml or its sflist
2141          */
2142         if (iml->sflist == 0) {
2143                 /* any-source empty exclude case */
2144                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2145         }
2146         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2147                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2148         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2149         iml->sflist = NULL;
2150         return err;
2151 }
2152
2153 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2154 {
2155         if (MLD_V1_SEEN(ma->idev)) {
2156                 if (ma->mca_flags & MAF_LAST_REPORTER)
2157                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2158                                 ICMPV6_MGM_REDUCTION);
2159         } else {
2160                 mld_add_delrec(ma->idev, ma);
2161                 mld_ifc_event(ma->idev);
2162         }
2163 }
2164
2165 static void mld_gq_timer_expire(unsigned long data)
2166 {
2167         struct inet6_dev *idev = (struct inet6_dev *)data;
2168
2169         idev->mc_gq_running = 0;
2170         mld_send_report(idev, NULL);
2171         __in6_dev_put(idev);
2172 }
2173
2174 static void mld_ifc_timer_expire(unsigned long data)
2175 {
2176         struct inet6_dev *idev = (struct inet6_dev *)data;
2177
2178         mld_send_cr(idev);
2179         if (idev->mc_ifc_count) {
2180                 idev->mc_ifc_count--;
2181                 if (idev->mc_ifc_count)
2182                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2183         }
2184         __in6_dev_put(idev);
2185 }
2186
2187 static void mld_ifc_event(struct inet6_dev *idev)
2188 {
2189         if (MLD_V1_SEEN(idev))
2190                 return;
2191         idev->mc_ifc_count = idev->mc_qrv;
2192         mld_ifc_start_timer(idev, 1);
2193 }
2194
2195
2196 static void igmp6_timer_handler(unsigned long data)
2197 {
2198         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2199
2200         if (MLD_V1_SEEN(ma->idev))
2201                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2202         else
2203                 mld_send_report(ma->idev, ma);
2204
2205         spin_lock(&ma->mca_lock);
2206         ma->mca_flags |=  MAF_LAST_REPORTER;
2207         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2208         spin_unlock(&ma->mca_lock);
2209         ma_put(ma);
2210 }
2211
2212 /* Device going down */
2213
2214 void ipv6_mc_down(struct inet6_dev *idev)
2215 {
2216         struct ifmcaddr6 *i;
2217
2218         /* Withdraw multicast list */
2219
2220         read_lock_bh(&idev->lock);
2221         idev->mc_ifc_count = 0;
2222         if (del_timer(&idev->mc_ifc_timer))
2223                 __in6_dev_put(idev);
2224         idev->mc_gq_running = 0;
2225         if (del_timer(&idev->mc_gq_timer))
2226                 __in6_dev_put(idev);
2227
2228         for (i = idev->mc_list; i; i=i->next)
2229                 igmp6_group_dropped(i);
2230         read_unlock_bh(&idev->lock);
2231
2232         mld_clear_delrec(idev);
2233 }
2234
2235
2236 /* Device going up */
2237
2238 void ipv6_mc_up(struct inet6_dev *idev)
2239 {
2240         struct ifmcaddr6 *i;
2241
2242         /* Install multicast list, except for all-nodes (already installed) */
2243
2244         read_lock_bh(&idev->lock);
2245         for (i = idev->mc_list; i; i=i->next)
2246                 igmp6_group_added(i);
2247         read_unlock_bh(&idev->lock);
2248 }
2249
2250 /* IPv6 device initialization. */
2251
2252 void ipv6_mc_init_dev(struct inet6_dev *idev)
2253 {
2254         struct in6_addr maddr;
2255
2256         write_lock_bh(&idev->lock);
2257         rwlock_init(&idev->mc_lock);
2258         idev->mc_gq_running = 0;
2259         init_timer(&idev->mc_gq_timer);
2260         idev->mc_gq_timer.data = (unsigned long) idev;
2261         idev->mc_gq_timer.function = &mld_gq_timer_expire;
2262         idev->mc_tomb = NULL;
2263         idev->mc_ifc_count = 0;
2264         init_timer(&idev->mc_ifc_timer);
2265         idev->mc_ifc_timer.data = (unsigned long) idev;
2266         idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2267         idev->mc_qrv = MLD_QRV_DEFAULT;
2268         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2269         idev->mc_v1_seen = 0;
2270         write_unlock_bh(&idev->lock);
2271
2272         /* Add all-nodes address. */
2273         ipv6_addr_all_nodes(&maddr);
2274         ipv6_dev_mc_inc(idev->dev, &maddr);
2275 }
2276
2277 /*
2278  *      Device is about to be destroyed: clean up.
2279  */
2280
2281 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2282 {
2283         struct ifmcaddr6 *i;
2284         struct in6_addr maddr;
2285
2286         /* Deactivate timers */
2287         ipv6_mc_down(idev);
2288
2289         /* Delete all-nodes address. */
2290         ipv6_addr_all_nodes(&maddr);
2291
2292         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2293          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2294          * fail.
2295          */
2296         __ipv6_dev_mc_dec(idev, &maddr);
2297
2298         if (idev->cnf.forwarding) {
2299                 ipv6_addr_all_routers(&maddr);
2300                 __ipv6_dev_mc_dec(idev, &maddr);
2301         }
2302
2303         write_lock_bh(&idev->lock);
2304         while ((i = idev->mc_list) != NULL) {
2305                 idev->mc_list = i->next;
2306                 write_unlock_bh(&idev->lock);
2307
2308                 igmp6_group_dropped(i);
2309                 ma_put(i);
2310
2311                 write_lock_bh(&idev->lock);
2312         }
2313         write_unlock_bh(&idev->lock);
2314 }
2315
2316 #ifdef CONFIG_PROC_FS
2317 struct igmp6_mc_iter_state {
2318         struct net_device *dev;
2319         struct inet6_dev *idev;
2320 };
2321
2322 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2323
2324 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2325 {
2326         struct ifmcaddr6 *im = NULL;
2327         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2328
2329         for (state->dev = dev_base, state->idev = NULL;
2330              state->dev;
2331              state->dev = state->dev->next) {
2332                 struct inet6_dev *idev;
2333                 idev = in6_dev_get(state->dev);
2334                 if (!idev)
2335                         continue;
2336                 read_lock_bh(&idev->lock);
2337                 im = idev->mc_list;
2338                 if (im) {
2339                         state->idev = idev;
2340                         break;
2341                 }
2342                 read_unlock_bh(&idev->lock);
2343                 in6_dev_put(idev);
2344         }
2345         return im;
2346 }
2347
2348 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2349 {
2350         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2351
2352         im = im->next;
2353         while (!im) {
2354                 if (likely(state->idev != NULL)) {
2355                         read_unlock_bh(&state->idev->lock);
2356                         in6_dev_put(state->idev);
2357                 }
2358                 state->dev = state->dev->next;
2359                 if (!state->dev) {
2360                         state->idev = NULL;
2361                         break;
2362                 }
2363                 state->idev = in6_dev_get(state->dev);
2364                 if (!state->idev)
2365                         continue;
2366                 read_lock_bh(&state->idev->lock);
2367                 im = state->idev->mc_list;
2368         }
2369         return im;
2370 }
2371
2372 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2373 {
2374         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2375         if (im)
2376                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2377                         --pos;
2378         return pos ? NULL : im;
2379 }
2380
2381 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2382 {
2383         read_lock(&dev_base_lock);
2384         return igmp6_mc_get_idx(seq, *pos);
2385 }
2386
2387 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2388 {
2389         struct ifmcaddr6 *im;
2390         im = igmp6_mc_get_next(seq, v);
2391         ++*pos;
2392         return im;
2393 }
2394
2395 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2396 {
2397         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2398         if (likely(state->idev != NULL)) {
2399                 read_unlock_bh(&state->idev->lock);
2400                 in6_dev_put(state->idev);
2401                 state->idev = NULL;
2402         }
2403         state->dev = NULL;
2404         read_unlock(&dev_base_lock);
2405 }
2406
2407 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2408 {
2409         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2410         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2411
2412         seq_printf(seq,
2413                    "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2414                    state->dev->ifindex, state->dev->name,
2415                    NIP6(im->mca_addr),
2416                    im->mca_users, im->mca_flags,
2417                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2418                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2419         return 0;
2420 }
2421
2422 static struct seq_operations igmp6_mc_seq_ops = {
2423         .start  =       igmp6_mc_seq_start,
2424         .next   =       igmp6_mc_seq_next,
2425         .stop   =       igmp6_mc_seq_stop,
2426         .show   =       igmp6_mc_seq_show,
2427 };
2428
2429 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2430 {
2431         struct seq_file *seq;
2432         int rc = -ENOMEM;
2433         struct igmp6_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2434
2435         if (!s)
2436                 goto out;
2437
2438         rc = seq_open(file, &igmp6_mc_seq_ops);
2439         if (rc)
2440                 goto out_kfree;
2441
2442         seq = file->private_data;
2443         seq->private = s;
2444 out:
2445         return rc;
2446 out_kfree:
2447         kfree(s);
2448         goto out;
2449 }
2450
2451 static struct file_operations igmp6_mc_seq_fops = {
2452         .owner          =       THIS_MODULE,
2453         .open           =       igmp6_mc_seq_open,
2454         .read           =       seq_read,
2455         .llseek         =       seq_lseek,
2456         .release        =       seq_release_private,
2457 };
2458
2459 struct igmp6_mcf_iter_state {
2460         struct net_device *dev;
2461         struct inet6_dev *idev;
2462         struct ifmcaddr6 *im;
2463 };
2464
2465 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2466
2467 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2468 {
2469         struct ip6_sf_list *psf = NULL;
2470         struct ifmcaddr6 *im = NULL;
2471         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2472
2473         for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2474              state->dev;
2475              state->dev = state->dev->next) {
2476                 struct inet6_dev *idev;
2477                 idev = in6_dev_get(state->dev);
2478                 if (unlikely(idev == NULL))
2479                         continue;
2480                 read_lock_bh(&idev->lock);
2481                 im = idev->mc_list;
2482                 if (likely(im != NULL)) {
2483                         spin_lock_bh(&im->mca_lock);
2484                         psf = im->mca_sources;
2485                         if (likely(psf != NULL)) {
2486                                 state->im = im;
2487                                 state->idev = idev;
2488                                 break;
2489                         }
2490                         spin_unlock_bh(&im->mca_lock);
2491                 }
2492                 read_unlock_bh(&idev->lock);
2493                 in6_dev_put(idev);
2494         }
2495         return psf;
2496 }
2497
2498 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2499 {
2500         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2501
2502         psf = psf->sf_next;
2503         while (!psf) {
2504                 spin_unlock_bh(&state->im->mca_lock);
2505                 state->im = state->im->next;
2506                 while (!state->im) {
2507                         if (likely(state->idev != NULL)) {
2508                                 read_unlock_bh(&state->idev->lock);
2509                                 in6_dev_put(state->idev);
2510                         }
2511                         state->dev = state->dev->next;
2512                         if (!state->dev) {
2513                                 state->idev = NULL;
2514                                 goto out;
2515                         }
2516                         state->idev = in6_dev_get(state->dev);
2517                         if (!state->idev)
2518                                 continue;
2519                         read_lock_bh(&state->idev->lock);
2520                         state->im = state->idev->mc_list;
2521                 }
2522                 if (!state->im)
2523                         break;
2524                 spin_lock_bh(&state->im->mca_lock);
2525                 psf = state->im->mca_sources;
2526         }
2527 out:
2528         return psf;
2529 }
2530
2531 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2532 {
2533         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2534         if (psf)
2535                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2536                         --pos;
2537         return pos ? NULL : psf;
2538 }
2539
2540 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2541 {
2542         read_lock(&dev_base_lock);
2543         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2544 }
2545
2546 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2547 {
2548         struct ip6_sf_list *psf;
2549         if (v == SEQ_START_TOKEN)
2550                 psf = igmp6_mcf_get_first(seq);
2551         else
2552                 psf = igmp6_mcf_get_next(seq, v);
2553         ++*pos;
2554         return psf;
2555 }
2556
2557 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2558 {
2559         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2560         if (likely(state->im != NULL)) {
2561                 spin_unlock_bh(&state->im->mca_lock);
2562                 state->im = NULL;
2563         }
2564         if (likely(state->idev != NULL)) {
2565                 read_unlock_bh(&state->idev->lock);
2566                 in6_dev_put(state->idev);
2567                 state->idev = NULL;
2568         }
2569         state->dev = NULL;
2570         read_unlock(&dev_base_lock);
2571 }
2572
2573 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2574 {
2575         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2576         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2577
2578         if (v == SEQ_START_TOKEN) {
2579                 seq_printf(seq,
2580                            "%3s %6s "
2581                            "%32s %32s %6s %6s\n", "Idx",
2582                            "Device", "Multicast Address",
2583                            "Source Address", "INC", "EXC");
2584         } else {
2585                 seq_printf(seq,
2586                            "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2587                            state->dev->ifindex, state->dev->name,
2588                            NIP6(state->im->mca_addr),
2589                            NIP6(psf->sf_addr),
2590                            psf->sf_count[MCAST_INCLUDE],
2591                            psf->sf_count[MCAST_EXCLUDE]);
2592         }
2593         return 0;
2594 }
2595
2596 static struct seq_operations igmp6_mcf_seq_ops = {
2597         .start  =       igmp6_mcf_seq_start,
2598         .next   =       igmp6_mcf_seq_next,
2599         .stop   =       igmp6_mcf_seq_stop,
2600         .show   =       igmp6_mcf_seq_show,
2601 };
2602
2603 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2604 {
2605         struct seq_file *seq;
2606         int rc = -ENOMEM;
2607         struct igmp6_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2608
2609         if (!s)
2610                 goto out;
2611
2612         rc = seq_open(file, &igmp6_mcf_seq_ops);
2613         if (rc)
2614                 goto out_kfree;
2615
2616         seq = file->private_data;
2617         seq->private = s;
2618 out:
2619         return rc;
2620 out_kfree:
2621         kfree(s);
2622         goto out;
2623 }
2624
2625 static struct file_operations igmp6_mcf_seq_fops = {
2626         .owner          =       THIS_MODULE,
2627         .open           =       igmp6_mcf_seq_open,
2628         .read           =       seq_read,
2629         .llseek         =       seq_lseek,
2630         .release        =       seq_release_private,
2631 };
2632 #endif
2633
2634 int __init igmp6_init(struct net_proto_family *ops)
2635 {
2636         struct ipv6_pinfo *np;
2637         struct sock *sk;
2638         int err;
2639
2640         err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2641         if (err < 0) {
2642                 printk(KERN_ERR
2643                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2644                        err);
2645                 igmp6_socket = NULL; /* For safety. */
2646                 return err;
2647         }
2648
2649         sk = igmp6_socket->sk;
2650         sk->sk_allocation = GFP_ATOMIC;
2651         sk->sk_prot->unhash(sk);
2652
2653         np = inet6_sk(sk);
2654         np->hop_limit = 1;
2655
2656 #ifdef CONFIG_PROC_FS
2657         proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2658         proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2659 #endif
2660
2661         return 0;
2662 }
2663
2664 void igmp6_cleanup(void)
2665 {
2666         sock_release(igmp6_socket);
2667         igmp6_socket = NULL; /* for safety */
2668
2669 #ifdef CONFIG_PROC_FS
2670         proc_net_remove("mcfilter6");
2671         proc_net_remove("igmp6");
2672 #endif
2673 }