SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/module.h>
  32 #include <linux/errno.h>
  33 #include <linux/types.h>
  34 #include <linux/string.h>
  35 #include <linux/socket.h>
  36 #include <linux/sockios.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/times.h>
  39 #include <linux/net.h>
  40 #include <linux/in.h>
  41 #include <linux/in6.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/if_arp.h>
  44 #include <linux/route.h>
  45 #include <linux/init.h>
  46 #include <linux/proc_fs.h>
  47 #include <linux/seq_file.h>
  48
  49 #include <linux/netfilter.h>
  50 #include <linux/netfilter_ipv6.h>
  51
  52 #include <net/net_namespace.h>
  53 #include <net/sock.h>
  54 #include <net/snmp.h>
  55
  56 #include <net/ipv6.h>
  57 #include <net/protocol.h>
  58 #include <net/if_inet6.h>
  59 #include <net/ndisc.h>
  60 #include <net/addrconf.h>
  61 #include <net/ip6_route.h>
  62
  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         __be16          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         __sum16 csum;
  96         __be16  resv2;
  97         __be16  ngrec;
  98         struct mld2_grec grec[0];
  99 };
 100
 101 struct mld2_query {
 102         __u8 type;
 103         __u8 code;
 104         __sum16 csum;
 105         __be16 mrc;
 106         __be16 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         __be16 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 __read_mostly = 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(&init_net, ifindex);
 219
 220         if (dev == NULL) {
 221                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 222                 return -ENODEV;
 223         }
 224
 225         mc_lst->ifindex = dev->ifindex;
 226         mc_lst->sfmode = MCAST_EXCLUDE;
 227         rwlock_init(&mc_lst->sflock);
 228         mc_lst->sflist = NULL;
 229
 230         /*
 231          *      now add/increase the group membership on the device
 232          */
 233
 234         err = ipv6_dev_mc_inc(dev, addr);
 235
 236         if (err) {
 237                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 238                 dev_put(dev);
 239                 return err;
 240         }
 241
 242         write_lock_bh(&ipv6_sk_mc_lock);
 243         mc_lst->next = np->ipv6_mc_list;
 244         np->ipv6_mc_list = mc_lst;
 245         write_unlock_bh(&ipv6_sk_mc_lock);
 246
 247         dev_put(dev);
 248
 249         return 0;
 250 }
 251
 252 /*
 253  *      socket leave on multicast group
 254  */
 255 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
 256 {
 257         struct ipv6_pinfo *np = inet6_sk(sk);
 258         struct ipv6_mc_socklist *mc_lst, **lnk;
 259
 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(&init_net, mc_lst->ifindex)) != NULL) {
 270                                 struct inet6_dev *idev = in6_dev_get(dev);
 271
 272                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 273                                 if (idev) {
 274                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 275                                         in6_dev_put(idev);
 276                                 }
 277                                 dev_put(dev);
 278                         } else
 279                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 280                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 281                         return 0;
 282                 }
 283         }
 284         write_unlock_bh(&ipv6_sk_mc_lock);
 285
 286         return -EADDRNOTAVAIL;
 287 }
 288
 289 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
 290 {
 291         struct net_device *dev = NULL;
 292         struct inet6_dev *idev = NULL;
 293
 294         if (ifindex == 0) {
 295                 struct rt6_info *rt;
 296
 297                 rt = rt6_lookup(group, NULL, 0, 0);
 298                 if (rt) {
 299                         dev = rt->rt6i_dev;
 300                         dev_hold(dev);
 301                         dst_release(&rt->u.dst);
 302                 }
 303         } else
 304                 dev = dev_get_by_index(&init_net, ifindex);
 305
 306         if (!dev)
 307                 return NULL;
 308         idev = in6_dev_get(dev);
 309         if (!idev) {
 310                 dev_put(dev);
 311                 return NULL;
 312         }
 313         read_lock_bh(&idev->lock);
 314         if (idev->dead) {
 315                 read_unlock_bh(&idev->lock);
 316                 in6_dev_put(idev);
 317                 dev_put(dev);
 318                 return NULL;
 319         }
 320         return idev;
 321 }
 322
 323 void ipv6_sock_mc_close(struct sock *sk)
 324 {
 325         struct ipv6_pinfo *np = inet6_sk(sk);
 326         struct ipv6_mc_socklist *mc_lst;
 327
 328         write_lock_bh(&ipv6_sk_mc_lock);
 329         while ((mc_lst = np->ipv6_mc_list) != NULL) {
 330                 struct net_device *dev;
 331
 332                 np->ipv6_mc_list = mc_lst->next;
 333                 write_unlock_bh(&ipv6_sk_mc_lock);
 334
 335                 dev = dev_get_by_index(&init_net, mc_lst->ifindex);
 336                 if (dev) {
 337                         struct inet6_dev *idev = in6_dev_get(dev);
 338
 339                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
 340                         if (idev) {
 341                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 342                                 in6_dev_put(idev);
 343                         }
 344                         dev_put(dev);
 345                 } else
 346                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 347
 348                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 349
 350                 write_lock_bh(&ipv6_sk_mc_lock);
 351         }
 352         write_unlock_bh(&ipv6_sk_mc_lock);
 353 }
 354
 355 int ip6_mc_source(int add, int omode, struct sock *sk,
 356         struct group_source_req *pgsr)
 357 {
 358         struct in6_addr *source, *group;
 359         struct ipv6_mc_socklist *pmc;
 360         struct net_device *dev;
 361         struct inet6_dev *idev;
 362         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 363         struct ip6_sf_socklist *psl;
 364         int i, j, rv;
 365         int leavegroup = 0;
 366         int pmclocked = 0;
 367         int err;
 368
 369         if (pgsr->gsr_group.ss_family != AF_INET6 ||
 370             pgsr->gsr_source.ss_family != AF_INET6)
 371                 return -EINVAL;
 372
 373         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 374         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 375
 376         if (!ipv6_addr_is_multicast(group))
 377                 return -EINVAL;
 378
 379         idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
 380         if (!idev)
 381                 return -ENODEV;
 382         dev = idev->dev;
 383
 384         err = -EADDRNOTAVAIL;
 385
 386         read_lock_bh(&ipv6_sk_mc_lock);
 387         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 388                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 389                         continue;
 390                 if (ipv6_addr_equal(&pmc->addr, group))
 391                         break;
 392         }
 393         if (!pmc) {             /* must have a prior join */
 394                 err = -EINVAL;
 395                 goto done;
 396         }
 397         /* if a source filter was set, must be the same mode as before */
 398         if (pmc->sflist) {
 399                 if (pmc->sfmode != omode) {
 400                         err = -EINVAL;
 401                         goto done;
 402                 }
 403         } else if (pmc->sfmode != omode) {
 404                 /* allow mode switches for empty-set filters */
 405                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 406                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 407                 pmc->sfmode = omode;
 408         }
 409
 410         write_lock_bh(&pmc->sflock);
 411         pmclocked = 1;
 412
 413         psl = pmc->sflist;
 414         if (!add) {
 415                 if (!psl)
 416                         goto done;      /* err = -EADDRNOTAVAIL */
 417                 rv = !0;
 418                 for (i=0; i<psl->sl_count; i++) {
 419                         rv = memcmp(&psl->sl_addr[i], source,
 420                                 sizeof(struct in6_addr));
 421                         if (rv == 0)
 422                                 break;
 423                 }
 424                 if (rv)         /* source not found */
 425                         goto done;      /* err = -EADDRNOTAVAIL */
 426
 427                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 428                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 429                         leavegroup = 1;
 430                         goto done;
 431                 }
 432
 433                 /* update the interface filter */
 434                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 435
 436                 for (j=i+1; j<psl->sl_count; j++)
 437                         psl->sl_addr[j-1] = psl->sl_addr[j];
 438                 psl->sl_count--;
 439                 err = 0;
 440                 goto done;
 441         }
 442         /* else, add a new source to the filter */
 443
 444         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 445                 err = -ENOBUFS;
 446                 goto done;
 447         }
 448         if (!psl || psl->sl_count == psl->sl_max) {
 449                 struct ip6_sf_socklist *newpsl;
 450                 int count = IP6_SFBLOCK;
 451
 452                 if (psl)
 453                         count += psl->sl_max;
 454                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 455                 if (!newpsl) {
 456                         err = -ENOBUFS;
 457                         goto done;
 458                 }
 459                 newpsl->sl_max = count;
 460                 newpsl->sl_count = count - IP6_SFBLOCK;
 461                 if (psl) {
 462                         for (i=0; i<psl->sl_count; i++)
 463                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 464                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 465                 }
 466                 pmc->sflist = psl = newpsl;
 467         }
 468         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 469         for (i=0; i<psl->sl_count; i++) {
 470                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 471                 if (rv == 0)
 472                         break;
 473         }
 474         if (rv == 0)            /* address already there is an error */
 475                 goto done;
 476         for (j=psl->sl_count-1; j>=i; j--)
 477                 psl->sl_addr[j+1] = psl->sl_addr[j];
 478         psl->sl_addr[i] = *source;
 479         psl->sl_count++;
 480         err = 0;
 481         /* update the interface list */
 482         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 483 done:
 484         if (pmclocked)
 485                 write_unlock_bh(&pmc->sflock);
 486         read_unlock_bh(&ipv6_sk_mc_lock);
 487         read_unlock_bh(&idev->lock);
 488         in6_dev_put(idev);
 489         dev_put(dev);
 490         if (leavegroup)
 491                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 492         return err;
 493 }
 494
 495 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 496 {
 497         struct in6_addr *group;
 498         struct ipv6_mc_socklist *pmc;
 499         struct net_device *dev;
 500         struct inet6_dev *idev;
 501         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 502         struct ip6_sf_socklist *newpsl, *psl;
 503         int leavegroup = 0;
 504         int i, err;
 505
 506         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 507
 508         if (!ipv6_addr_is_multicast(group))
 509                 return -EINVAL;
 510         if (gsf->gf_fmode != MCAST_INCLUDE &&
 511             gsf->gf_fmode != MCAST_EXCLUDE)
 512                 return -EINVAL;
 513
 514         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 515
 516         if (!idev)
 517                 return -ENODEV;
 518         dev = idev->dev;
 519
 520         err = 0;
 521         read_lock_bh(&ipv6_sk_mc_lock);
 522
 523         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 524                 leavegroup = 1;
 525                 goto done;
 526         }
 527
 528         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 529                 if (pmc->ifindex != gsf->gf_interface)
 530                         continue;
 531                 if (ipv6_addr_equal(&pmc->addr, group))
 532                         break;
 533         }
 534         if (!pmc) {             /* must have a prior join */
 535                 err = -EINVAL;
 536                 goto done;
 537         }
 538         if (gsf->gf_numsrc) {
 539                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 540                                                           GFP_ATOMIC);
 541                 if (!newpsl) {
 542                         err = -ENOBUFS;
 543                         goto done;
 544                 }
 545                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 546                 for (i=0; i<newpsl->sl_count; ++i) {
 547                         struct sockaddr_in6 *psin6;
 548
 549                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 550                         newpsl->sl_addr[i] = psin6->sin6_addr;
 551                 }
 552                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 553                         newpsl->sl_count, newpsl->sl_addr, 0);
 554                 if (err) {
 555                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 556                         goto done;
 557                 }
 558         } else {
 559                 newpsl = NULL;
 560                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 561         }
 562
 563         write_lock_bh(&pmc->sflock);
 564         psl = pmc->sflist;
 565         if (psl) {
 566                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 567                         psl->sl_count, psl->sl_addr, 0);
 568                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 569         } else
 570                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 571         pmc->sflist = newpsl;
 572         pmc->sfmode = gsf->gf_fmode;
 573         write_unlock_bh(&pmc->sflock);
 574         err = 0;
 575 done:
 576         read_unlock_bh(&ipv6_sk_mc_lock);
 577         read_unlock_bh(&idev->lock);
 578         in6_dev_put(idev);
 579         dev_put(dev);
 580         if (leavegroup)
 581                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 582         return err;
 583 }
 584
 585 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 586         struct group_filter __user *optval, int __user *optlen)
 587 {
 588         int err, i, count, copycount;
 589         struct in6_addr *group;
 590         struct ipv6_mc_socklist *pmc;
 591         struct inet6_dev *idev;
 592         struct net_device *dev;
 593         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 594         struct ip6_sf_socklist *psl;
 595
 596         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 597
 598         if (!ipv6_addr_is_multicast(group))
 599                 return -EINVAL;
 600
 601         idev = ip6_mc_find_dev(group, gsf->gf_interface);
 602
 603         if (!idev)
 604                 return -ENODEV;
 605
 606         dev = idev->dev;
 607
 608         err = -EADDRNOTAVAIL;
 609         /*
 610          * changes to the ipv6_mc_list require the socket lock and
 611          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 612          * so reading the list is safe.
 613          */
 614
 615         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 616                 if (pmc->ifindex != gsf->gf_interface)
 617                         continue;
 618                 if (ipv6_addr_equal(group, &pmc->addr))
 619                         break;
 620         }
 621         if (!pmc)               /* must have a prior join */
 622                 goto done;
 623         gsf->gf_fmode = pmc->sfmode;
 624         psl = pmc->sflist;
 625         count = psl ? psl->sl_count : 0;
 626         read_unlock_bh(&idev->lock);
 627         in6_dev_put(idev);
 628         dev_put(dev);
 629
 630         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 631         gsf->gf_numsrc = count;
 632         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 633             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 634                 return -EFAULT;
 635         }
 636         /* changes to psl require the socket lock, a read lock on
 637          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 638          * have the socket lock, so reading here is safe.
 639          */
 640         for (i=0; i<copycount; i++) {
 641                 struct sockaddr_in6 *psin6;
 642                 struct sockaddr_storage ss;
 643
 644                 psin6 = (struct sockaddr_in6 *)&ss;
 645                 memset(&ss, 0, sizeof(ss));
 646                 psin6->sin6_family = AF_INET6;
 647                 psin6->sin6_addr = psl->sl_addr[i];
 648                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 649                         return -EFAULT;
 650         }
 651         return 0;
 652 done:
 653         read_unlock_bh(&idev->lock);
 654         in6_dev_put(idev);
 655         dev_put(dev);
 656         return err;
 657 }
 658
 659 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
 660         struct in6_addr *src_addr)
 661 {
 662         struct ipv6_pinfo *np = inet6_sk(sk);
 663         struct ipv6_mc_socklist *mc;
 664         struct ip6_sf_socklist *psl;
 665         int rv = 1;
 666
 667         read_lock(&ipv6_sk_mc_lock);
 668         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 669                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 670                         break;
 671         }
 672         if (!mc) {
 673                 read_unlock(&ipv6_sk_mc_lock);
 674                 return 1;
 675         }
 676         read_lock(&mc->sflock);
 677         psl = mc->sflist;
 678         if (!psl) {
 679                 rv = mc->sfmode == MCAST_EXCLUDE;
 680         } else {
 681                 int i;
 682
 683                 for (i=0; i<psl->sl_count; i++) {
 684                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 685                                 break;
 686                 }
 687                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 688                         rv = 0;
 689                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 690                         rv = 0;
 691         }
 692         read_unlock(&mc->sflock);
 693         read_unlock(&ipv6_sk_mc_lock);
 694
 695         return rv;
 696 }
 697
 698 static void ma_put(struct ifmcaddr6 *mc)
 699 {
 700         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 701                 in6_dev_put(mc->idev);
 702                 kfree(mc);
 703         }
 704 }
 705
 706 static void igmp6_group_added(struct ifmcaddr6 *mc)
 707 {
 708         struct net_device *dev = mc->idev->dev;
 709         char buf[MAX_ADDR_LEN];
 710
 711         spin_lock_bh(&mc->mca_lock);
 712         if (!(mc->mca_flags&MAF_LOADED)) {
 713                 mc->mca_flags |= MAF_LOADED;
 714                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 715                         dev_mc_add(dev, buf, dev->addr_len, 0);
 716         }
 717         spin_unlock_bh(&mc->mca_lock);
 718
 719         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 720                 return;
 721
 722         if (MLD_V1_SEEN(mc->idev)) {
 723                 igmp6_join_group(mc);
 724                 return;
 725         }
 726         /* else v2 */
 727
 728         mc->mca_crcount = mc->idev->mc_qrv;
 729         mld_ifc_event(mc->idev);
 730 }
 731
 732 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 733 {
 734         struct net_device *dev = mc->idev->dev;
 735         char buf[MAX_ADDR_LEN];
 736
 737         spin_lock_bh(&mc->mca_lock);
 738         if (mc->mca_flags&MAF_LOADED) {
 739                 mc->mca_flags &= ~MAF_LOADED;
 740                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 741                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 742         }
 743
 744         if (mc->mca_flags & MAF_NOREPORT)
 745                 goto done;
 746         spin_unlock_bh(&mc->mca_lock);
 747
 748         if (!mc->idev->dead)
 749                 igmp6_leave_group(mc);
 750
 751         spin_lock_bh(&mc->mca_lock);
 752         if (del_timer(&mc->mca_timer))
 753                 atomic_dec(&mc->mca_refcnt);
 754 done:
 755         ip6_mc_clear_src(mc);
 756         spin_unlock_bh(&mc->mca_lock);
 757 }
 758
 759 /*
 760  * deleted ifmcaddr6 manipulation
 761  */
 762 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 763 {
 764         struct ifmcaddr6 *pmc;
 765
 766         /* this is an "ifmcaddr6" for convenience; only the fields below
 767          * are actually used. In particular, the refcnt and users are not
 768          * used for management of the delete list. Using the same structure
 769          * for deleted items allows change reports to use common code with
 770          * non-deleted or query-response MCA's.
 771          */
 772         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 773         if (!pmc)
 774                 return;
 775
 776         spin_lock_bh(&im->mca_lock);
 777         spin_lock_init(&pmc->mca_lock);
 778         pmc->idev = im->idev;
 779         in6_dev_hold(idev);
 780         pmc->mca_addr = im->mca_addr;
 781         pmc->mca_crcount = idev->mc_qrv;
 782         pmc->mca_sfmode = im->mca_sfmode;
 783         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 784                 struct ip6_sf_list *psf;
 785
 786                 pmc->mca_tomb = im->mca_tomb;
 787                 pmc->mca_sources = im->mca_sources;
 788                 im->mca_tomb = im->mca_sources = NULL;
 789                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 790                         psf->sf_crcount = pmc->mca_crcount;
 791         }
 792         spin_unlock_bh(&im->mca_lock);
 793
 794         write_lock_bh(&idev->mc_lock);
 795         pmc->next = idev->mc_tomb;
 796         idev->mc_tomb = pmc;
 797         write_unlock_bh(&idev->mc_lock);
 798 }
 799
 800 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 801 {
 802         struct ifmcaddr6 *pmc, *pmc_prev;
 803         struct ip6_sf_list *psf, *psf_next;
 804
 805         write_lock_bh(&idev->mc_lock);
 806         pmc_prev = NULL;
 807         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 808                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 809                         break;
 810                 pmc_prev = pmc;
 811         }
 812         if (pmc) {
 813                 if (pmc_prev)
 814                         pmc_prev->next = pmc->next;
 815                 else
 816                         idev->mc_tomb = pmc->next;
 817         }
 818         write_unlock_bh(&idev->mc_lock);
 819         if (pmc) {
 820                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 821                         psf_next = psf->sf_next;
 822                         kfree(psf);
 823                 }
 824                 in6_dev_put(pmc->idev);
 825                 kfree(pmc);
 826         }
 827 }
 828
 829 static void mld_clear_delrec(struct inet6_dev *idev)
 830 {
 831         struct ifmcaddr6 *pmc, *nextpmc;
 832
 833         write_lock_bh(&idev->mc_lock);
 834         pmc = idev->mc_tomb;
 835         idev->mc_tomb = NULL;
 836         write_unlock_bh(&idev->mc_lock);
 837
 838         for (; pmc; pmc = nextpmc) {
 839                 nextpmc = pmc->next;
 840                 ip6_mc_clear_src(pmc);
 841                 in6_dev_put(pmc->idev);
 842                 kfree(pmc);
 843         }
 844
 845         /* clear dead sources, too */
 846         read_lock_bh(&idev->lock);
 847         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 848                 struct ip6_sf_list *psf, *psf_next;
 849
 850                 spin_lock_bh(&pmc->mca_lock);
 851                 psf = pmc->mca_tomb;
 852                 pmc->mca_tomb = NULL;
 853                 spin_unlock_bh(&pmc->mca_lock);
 854                 for (; psf; psf=psf_next) {
 855                         psf_next = psf->sf_next;
 856                         kfree(psf);
 857                 }
 858         }
 859         read_unlock_bh(&idev->lock);
 860 }
 861
 862
 863 /*
 864  *      device multicast group inc (add if not found)
 865  */
 866 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
 867 {
 868         struct ifmcaddr6 *mc;
 869         struct inet6_dev *idev;
 870
 871         idev = in6_dev_get(dev);
 872
 873         if (idev == NULL)
 874                 return -EINVAL;
 875
 876         write_lock_bh(&idev->lock);
 877         if (idev->dead) {
 878                 write_unlock_bh(&idev->lock);
 879                 in6_dev_put(idev);
 880                 return -ENODEV;
 881         }
 882
 883         for (mc = idev->mc_list; mc; mc = mc->next) {
 884                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 885                         mc->mca_users++;
 886                         write_unlock_bh(&idev->lock);
 887                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 888                                 NULL, 0);
 889                         in6_dev_put(idev);
 890                         return 0;
 891                 }
 892         }
 893
 894         /*
 895          *      not found: create a new one.
 896          */
 897
 898         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 899
 900         if (mc == NULL) {
 901                 write_unlock_bh(&idev->lock);
 902                 in6_dev_put(idev);
 903                 return -ENOMEM;
 904         }
 905
 906         setup_timer(&mc->mca_timer, igmp6_timer_handler, (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 = icmp6_hdr(skb);
 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(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1170         len -= skb_network_header_len(skb);
1171
1172         /* Drop queries with not link local source */
1173         if (!(ipv6_addr_type(&ipv6_hdr(skb)->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 = icmp6_hdr(skb);
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_transport_header(skb);
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_transport_header(skb);
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 = icmp6_hdr(skb);
1303
1304         /* Drop reports with not link local source */
1305         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->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)
1409                 return NULL;
1410
1411         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1412
1413         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
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         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1426         skb_put(skb, sizeof(*pmr));
1427         pmr = (struct mld2_report *)skb_transport_header(skb);
1428         pmr->type = ICMPV6_MLD2_REPORT;
1429         pmr->resv1 = 0;
1430         pmr->csum = 0;
1431         pmr->resv2 = 0;
1432         pmr->ngrec = 0;
1433         return skb;
1434 }
1435
1436 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1437 {
1438         struct net_device *dev = skb->dev;
1439         unsigned char ha[MAX_ADDR_LEN];
1440
1441         ndisc_mc_map(&ipv6_hdr(skb)->daddr, ha, dev, 1);
1442         if (dev_hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len) < 0) {
1443                 kfree_skb(skb);
1444                 return -EINVAL;
1445         }
1446         return dev_queue_xmit(skb);
1447 }
1448
1449 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1450 {
1451         return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb->dev,
1452                        mld_dev_queue_xmit2);
1453 }
1454
1455 static void mld_sendpack(struct sk_buff *skb)
1456 {
1457         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1458         struct mld2_report *pmr =
1459                               (struct mld2_report *)skb_transport_header(skb);
1460         int payload_len, mldlen;
1461         struct inet6_dev *idev = in6_dev_get(skb->dev);
1462         int err;
1463
1464         IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1465         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1466         mldlen = skb->tail - skb->transport_header;
1467         pip6->payload_len = htons(payload_len);
1468
1469         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1470                 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1471                                              mldlen, 0));
1472         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1473                 mld_dev_queue_xmit);
1474         if (!err) {
1475                 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1476                 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1477                 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1478         } else
1479                 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1480
1481         if (likely(idev != NULL))
1482                 in6_dev_put(idev);
1483 }
1484
1485 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1486 {
1487         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1488 }
1489
1490 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1491         int type, struct mld2_grec **ppgr)
1492 {
1493         struct net_device *dev = pmc->idev->dev;
1494         struct mld2_report *pmr;
1495         struct mld2_grec *pgr;
1496
1497         if (!skb)
1498                 skb = mld_newpack(dev, dev->mtu);
1499         if (!skb)
1500                 return NULL;
1501         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1502         pgr->grec_type = type;
1503         pgr->grec_auxwords = 0;
1504         pgr->grec_nsrcs = 0;
1505         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1506         pmr = (struct mld2_report *)skb_transport_header(skb);
1507         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1508         *ppgr = pgr;
1509         return skb;
1510 }
1511
1512 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1513         skb_tailroom(skb)) : 0)
1514
1515 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1516         int type, int gdeleted, int sdeleted)
1517 {
1518         struct net_device *dev = pmc->idev->dev;
1519         struct mld2_report *pmr;
1520         struct mld2_grec *pgr = NULL;
1521         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1522         int scount, stotal, first, isquery, truncate;
1523
1524         if (pmc->mca_flags & MAF_NOREPORT)
1525                 return skb;
1526
1527         isquery = type == MLD2_MODE_IS_INCLUDE ||
1528                   type == MLD2_MODE_IS_EXCLUDE;
1529         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1530                     type == MLD2_CHANGE_TO_EXCLUDE;
1531
1532         stotal = scount = 0;
1533
1534         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1535
1536         if (!*psf_list)
1537                 goto empty_source;
1538
1539         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1540
1541         /* EX and TO_EX get a fresh packet, if needed */
1542         if (truncate) {
1543                 if (pmr && pmr->ngrec &&
1544                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1545                         if (skb)
1546                                 mld_sendpack(skb);
1547                         skb = mld_newpack(dev, dev->mtu);
1548                 }
1549         }
1550         first = 1;
1551         psf_prev = NULL;
1552         for (psf=*psf_list; psf; psf=psf_next) {
1553                 struct in6_addr *psrc;
1554
1555                 psf_next = psf->sf_next;
1556
1557                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1558                         psf_prev = psf;
1559                         continue;
1560                 }
1561
1562                 /* clear marks on query responses */
1563                 if (isquery)
1564                         psf->sf_gsresp = 0;
1565
1566                 if (AVAILABLE(skb) < sizeof(*psrc) +
1567                     first*sizeof(struct mld2_grec)) {
1568                         if (truncate && !first)
1569                                 break;   /* truncate these */
1570                         if (pgr)
1571                                 pgr->grec_nsrcs = htons(scount);
1572                         if (skb)
1573                                 mld_sendpack(skb);
1574                         skb = mld_newpack(dev, dev->mtu);
1575                         first = 1;
1576                         scount = 0;
1577                 }
1578                 if (first) {
1579                         skb = add_grhead(skb, pmc, type, &pgr);
1580                         first = 0;
1581                 }
1582                 if (!skb)
1583                         return NULL;
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         rcu_read_lock();
1766         IP6_INC_STATS(__in6_dev_get(dev),
1767                       IPSTATS_MIB_OUTREQUESTS);
1768         rcu_read_unlock();
1769         snd_addr = addr;
1770         if (type == ICMPV6_MGM_REDUCTION) {
1771                 snd_addr = &all_routers;
1772                 ipv6_addr_all_routers(&all_routers);
1773         }
1774
1775         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1776         payload_len = len + sizeof(ra);
1777         full_len = sizeof(struct ipv6hdr) + payload_len;
1778
1779         skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1780
1781         if (skb == NULL) {
1782                 rcu_read_lock();
1783                 IP6_INC_STATS(__in6_dev_get(dev),
1784                               IPSTATS_MIB_OUTDISCARDS);
1785                 rcu_read_unlock();
1786                 return;
1787         }
1788
1789         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1790
1791         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1792                 /* <draft-ietf-magma-mld-source-05.txt>:
1793                  * use unspecified address as the source address
1794                  * when a valid link-local address is not available.
1795                  */
1796                 memset(&addr_buf, 0, sizeof(addr_buf));
1797         }
1798
1799         ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1800
1801         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1802
1803         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1804         memset(hdr, 0, sizeof(struct icmp6hdr));
1805         hdr->icmp6_type = type;
1806
1807         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1808         ipv6_addr_copy(addrp, addr);
1809
1810         hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1811                                            IPPROTO_ICMPV6,
1812                                            csum_partial((__u8 *) hdr, len, 0));
1813
1814         idev = in6_dev_get(skb->dev);
1815
1816         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1817                 mld_dev_queue_xmit);
1818         if (!err) {
1819                 ICMP6MSGOUT_INC_STATS(idev, type);
1820                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1821                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1822         } else
1823                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1824
1825         if (likely(idev != NULL))
1826                 in6_dev_put(idev);
1827         return;
1828 }
1829
1830 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1831         struct in6_addr *psfsrc)
1832 {
1833         struct ip6_sf_list *psf, *psf_prev;
1834         int rv = 0;
1835
1836         psf_prev = NULL;
1837         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1838                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1839                         break;
1840                 psf_prev = psf;
1841         }
1842         if (!psf || psf->sf_count[sfmode] == 0) {
1843                 /* source filter not found, or count wrong =>  bug */
1844                 return -ESRCH;
1845         }
1846         psf->sf_count[sfmode]--;
1847         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1848                 struct inet6_dev *idev = pmc->idev;
1849
1850                 /* no more filters for this source */
1851                 if (psf_prev)
1852                         psf_prev->sf_next = psf->sf_next;
1853                 else
1854                         pmc->mca_sources = psf->sf_next;
1855                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1856                     !MLD_V1_SEEN(idev)) {
1857                         psf->sf_crcount = idev->mc_qrv;
1858                         psf->sf_next = pmc->mca_tomb;
1859                         pmc->mca_tomb = psf;
1860                         rv = 1;
1861                 } else
1862                         kfree(psf);
1863         }
1864         return rv;
1865 }
1866
1867 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1868                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1869                           int delta)
1870 {
1871         struct ifmcaddr6 *pmc;
1872         int     changerec = 0;
1873         int     i, err;
1874
1875         if (!idev)
1876                 return -ENODEV;
1877         read_lock_bh(&idev->lock);
1878         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1879                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1880                         break;
1881         }
1882         if (!pmc) {
1883                 /* MCA not found?? bug */
1884                 read_unlock_bh(&idev->lock);
1885                 return -ESRCH;
1886         }
1887         spin_lock_bh(&pmc->mca_lock);
1888         sf_markstate(pmc);
1889         if (!delta) {
1890                 if (!pmc->mca_sfcount[sfmode]) {
1891                         spin_unlock_bh(&pmc->mca_lock);
1892                         read_unlock_bh(&idev->lock);
1893                         return -EINVAL;
1894                 }
1895                 pmc->mca_sfcount[sfmode]--;
1896         }
1897         err = 0;
1898         for (i=0; i<sfcount; i++) {
1899                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1900
1901                 changerec |= rv > 0;
1902                 if (!err && rv < 0)
1903                         err = rv;
1904         }
1905         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1906             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1907             pmc->mca_sfcount[MCAST_INCLUDE]) {
1908                 struct ip6_sf_list *psf;
1909
1910                 /* filter mode change */
1911                 pmc->mca_sfmode = MCAST_INCLUDE;
1912                 pmc->mca_crcount = idev->mc_qrv;
1913                 idev->mc_ifc_count = pmc->mca_crcount;
1914                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1915                         psf->sf_crcount = 0;
1916                 mld_ifc_event(pmc->idev);
1917         } else if (sf_setstate(pmc) || changerec)
1918                 mld_ifc_event(pmc->idev);
1919         spin_unlock_bh(&pmc->mca_lock);
1920         read_unlock_bh(&idev->lock);
1921         return err;
1922 }
1923
1924 /*
1925  * Add multicast single-source filter to the interface list
1926  */
1927 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1928         struct in6_addr *psfsrc, int delta)
1929 {
1930         struct ip6_sf_list *psf, *psf_prev;
1931
1932         psf_prev = NULL;
1933         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1934                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1935                         break;
1936                 psf_prev = psf;
1937         }
1938         if (!psf) {
1939                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1940                 if (!psf)
1941                         return -ENOBUFS;
1942
1943                 psf->sf_addr = *psfsrc;
1944                 if (psf_prev) {
1945                         psf_prev->sf_next = psf;
1946                 } else
1947                         pmc->mca_sources = psf;
1948         }
1949         psf->sf_count[sfmode]++;
1950         return 0;
1951 }
1952
1953 static void sf_markstate(struct ifmcaddr6 *pmc)
1954 {
1955         struct ip6_sf_list *psf;
1956         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1957
1958         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1959                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1960                         psf->sf_oldin = mca_xcount ==
1961                                 psf->sf_count[MCAST_EXCLUDE] &&
1962                                 !psf->sf_count[MCAST_INCLUDE];
1963                 } else
1964                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1965 }
1966
1967 static int sf_setstate(struct ifmcaddr6 *pmc)
1968 {
1969         struct ip6_sf_list *psf, *dpsf;
1970         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1971         int qrv = pmc->idev->mc_qrv;
1972         int new_in, rv;
1973
1974         rv = 0;
1975         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1976                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1977                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1978                                 !psf->sf_count[MCAST_INCLUDE];
1979                 } else
1980                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1981                 if (new_in) {
1982                         if (!psf->sf_oldin) {
1983                                 struct ip6_sf_list *prev = NULL;
1984
1985                                 for (dpsf=pmc->mca_tomb; dpsf;
1986                                      dpsf=dpsf->sf_next) {
1987                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1988                                             &psf->sf_addr))
1989                                                 break;
1990                                         prev = dpsf;
1991                                 }
1992                                 if (dpsf) {
1993                                         if (prev)
1994                                                 prev->sf_next = dpsf->sf_next;
1995                                         else
1996                                                 pmc->mca_tomb = dpsf->sf_next;
1997                                         kfree(dpsf);
1998                                 }
1999                                 psf->sf_crcount = qrv;
2000                                 rv++;
2001                         }
2002                 } else if (psf->sf_oldin) {
2003                         psf->sf_crcount = 0;
2004                         /*
2005                          * add or update "delete" records if an active filter
2006                          * is now inactive
2007                          */
2008                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2009                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2010                                     &psf->sf_addr))
2011                                         break;
2012                         if (!dpsf) {
2013                                 dpsf = (struct ip6_sf_list *)
2014                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2015                                 if (!dpsf)
2016                                         continue;
2017                                 *dpsf = *psf;
2018                                 /* pmc->mca_lock held by callers */
2019                                 dpsf->sf_next = pmc->mca_tomb;
2020                                 pmc->mca_tomb = dpsf;
2021                         }
2022                         dpsf->sf_crcount = qrv;
2023                         rv++;
2024                 }
2025         }
2026         return rv;
2027 }
2028
2029 /*
2030  * Add multicast source filter list to the interface list
2031  */
2032 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2033                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2034                           int delta)
2035 {
2036         struct ifmcaddr6 *pmc;
2037         int     isexclude;
2038         int     i, err;
2039
2040         if (!idev)
2041                 return -ENODEV;
2042         read_lock_bh(&idev->lock);
2043         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2044                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2045                         break;
2046         }
2047         if (!pmc) {
2048                 /* MCA not found?? bug */
2049                 read_unlock_bh(&idev->lock);
2050                 return -ESRCH;
2051         }
2052         spin_lock_bh(&pmc->mca_lock);
2053
2054         sf_markstate(pmc);
2055         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2056         if (!delta)
2057                 pmc->mca_sfcount[sfmode]++;
2058         err = 0;
2059         for (i=0; i<sfcount; i++) {
2060                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2061                 if (err)
2062                         break;
2063         }
2064         if (err) {
2065                 int j;
2066
2067                 if (!delta)
2068                         pmc->mca_sfcount[sfmode]--;
2069                 for (j=0; j<i; j++)
2070                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2071         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2072                 struct inet6_dev *idev = pmc->idev;
2073                 struct ip6_sf_list *psf;
2074
2075                 /* filter mode change */
2076                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2077                         pmc->mca_sfmode = MCAST_EXCLUDE;
2078                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2079                         pmc->mca_sfmode = MCAST_INCLUDE;
2080                 /* else no filters; keep old mode for reports */
2081
2082                 pmc->mca_crcount = idev->mc_qrv;
2083                 idev->mc_ifc_count = pmc->mca_crcount;
2084                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2085                         psf->sf_crcount = 0;
2086                 mld_ifc_event(idev);
2087         } else if (sf_setstate(pmc))
2088                 mld_ifc_event(idev);
2089         spin_unlock_bh(&pmc->mca_lock);
2090         read_unlock_bh(&idev->lock);
2091         return err;
2092 }
2093
2094 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2095 {
2096         struct ip6_sf_list *psf, *nextpsf;
2097
2098         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2099                 nextpsf = psf->sf_next;
2100                 kfree(psf);
2101         }
2102         pmc->mca_tomb = NULL;
2103         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2104                 nextpsf = psf->sf_next;
2105                 kfree(psf);
2106         }
2107         pmc->mca_sources = NULL;
2108         pmc->mca_sfmode = MCAST_EXCLUDE;
2109         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2110         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2111 }
2112
2113
2114 static void igmp6_join_group(struct ifmcaddr6 *ma)
2115 {
2116         unsigned long delay;
2117
2118         if (ma->mca_flags & MAF_NOREPORT)
2119                 return;
2120
2121         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2122
2123         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2124
2125         spin_lock_bh(&ma->mca_lock);
2126         if (del_timer(&ma->mca_timer)) {
2127                 atomic_dec(&ma->mca_refcnt);
2128                 delay = ma->mca_timer.expires - jiffies;
2129         }
2130
2131         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2132                 atomic_inc(&ma->mca_refcnt);
2133         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2134         spin_unlock_bh(&ma->mca_lock);
2135 }
2136
2137 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2138                             struct inet6_dev *idev)
2139 {
2140         int err;
2141
2142         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2143          * so no other readers or writers of iml or its sflist
2144          */
2145         if (!iml->sflist) {
2146                 /* any-source empty exclude case */
2147                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2148         }
2149         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2150                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2151         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2152         iml->sflist = NULL;
2153         return err;
2154 }
2155
2156 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2157 {
2158         if (MLD_V1_SEEN(ma->idev)) {
2159                 if (ma->mca_flags & MAF_LAST_REPORTER)
2160                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2161                                 ICMPV6_MGM_REDUCTION);
2162         } else {
2163                 mld_add_delrec(ma->idev, ma);
2164                 mld_ifc_event(ma->idev);
2165         }
2166 }
2167
2168 static void mld_gq_timer_expire(unsigned long data)
2169 {
2170         struct inet6_dev *idev = (struct inet6_dev *)data;
2171
2172         idev->mc_gq_running = 0;
2173         mld_send_report(idev, NULL);
2174         __in6_dev_put(idev);
2175 }
2176
2177 static void mld_ifc_timer_expire(unsigned long data)
2178 {
2179         struct inet6_dev *idev = (struct inet6_dev *)data;
2180
2181         mld_send_cr(idev);
2182         if (idev->mc_ifc_count) {
2183                 idev->mc_ifc_count--;
2184                 if (idev->mc_ifc_count)
2185                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2186         }
2187         __in6_dev_put(idev);
2188 }
2189
2190 static void mld_ifc_event(struct inet6_dev *idev)
2191 {
2192         if (MLD_V1_SEEN(idev))
2193                 return;
2194         idev->mc_ifc_count = idev->mc_qrv;
2195         mld_ifc_start_timer(idev, 1);
2196 }
2197
2198
2199 static void igmp6_timer_handler(unsigned long data)
2200 {
2201         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2202
2203         if (MLD_V1_SEEN(ma->idev))
2204                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2205         else
2206                 mld_send_report(ma->idev, ma);
2207
2208         spin_lock(&ma->mca_lock);
2209         ma->mca_flags |=  MAF_LAST_REPORTER;
2210         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2211         spin_unlock(&ma->mca_lock);
2212         ma_put(ma);
2213 }
2214
2215 /* Device going down */
2216
2217 void ipv6_mc_down(struct inet6_dev *idev)
2218 {
2219         struct ifmcaddr6 *i;
2220
2221         /* Withdraw multicast list */
2222
2223         read_lock_bh(&idev->lock);
2224         idev->mc_ifc_count = 0;
2225         if (del_timer(&idev->mc_ifc_timer))
2226                 __in6_dev_put(idev);
2227         idev->mc_gq_running = 0;
2228         if (del_timer(&idev->mc_gq_timer))
2229                 __in6_dev_put(idev);
2230
2231         for (i = idev->mc_list; i; i=i->next)
2232                 igmp6_group_dropped(i);
2233         read_unlock_bh(&idev->lock);
2234
2235         mld_clear_delrec(idev);
2236 }
2237
2238
2239 /* Device going up */
2240
2241 void ipv6_mc_up(struct inet6_dev *idev)
2242 {
2243         struct ifmcaddr6 *i;
2244
2245         /* Install multicast list, except for all-nodes (already installed) */
2246
2247         read_lock_bh(&idev->lock);
2248         for (i = idev->mc_list; i; i=i->next)
2249                 igmp6_group_added(i);
2250         read_unlock_bh(&idev->lock);
2251 }
2252
2253 /* IPv6 device initialization. */
2254
2255 void ipv6_mc_init_dev(struct inet6_dev *idev)
2256 {
2257         write_lock_bh(&idev->lock);
2258         rwlock_init(&idev->mc_lock);
2259         idev->mc_gq_running = 0;
2260         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2261                         (unsigned long)idev);
2262         idev->mc_tomb = NULL;
2263         idev->mc_ifc_count = 0;
2264         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2265                         (unsigned long)idev);
2266         idev->mc_qrv = MLD_QRV_DEFAULT;
2267         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2268         idev->mc_v1_seen = 0;
2269         write_unlock_bh(&idev->lock);
2270 }
2271
2272 /*
2273  *      Device is about to be destroyed: clean up.
2274  */
2275
2276 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2277 {
2278         struct ifmcaddr6 *i;
2279         struct in6_addr maddr;
2280
2281         /* Deactivate timers */
2282         ipv6_mc_down(idev);
2283
2284         /* Delete all-nodes address. */
2285         ipv6_addr_all_nodes(&maddr);
2286
2287         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2288          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2289          * fail.
2290          */
2291         __ipv6_dev_mc_dec(idev, &maddr);
2292
2293         if (idev->cnf.forwarding) {
2294                 ipv6_addr_all_routers(&maddr);
2295                 __ipv6_dev_mc_dec(idev, &maddr);
2296         }
2297
2298         write_lock_bh(&idev->lock);
2299         while ((i = idev->mc_list) != NULL) {
2300                 idev->mc_list = i->next;
2301                 write_unlock_bh(&idev->lock);
2302
2303                 igmp6_group_dropped(i);
2304                 ma_put(i);
2305
2306                 write_lock_bh(&idev->lock);
2307         }
2308         write_unlock_bh(&idev->lock);
2309 }
2310
2311 #ifdef CONFIG_PROC_FS
2312 struct igmp6_mc_iter_state {
2313         struct net_device *dev;
2314         struct inet6_dev *idev;
2315 };
2316
2317 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2318
2319 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2320 {
2321         struct ifmcaddr6 *im = NULL;
2322         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2323
2324         state->idev = NULL;
2325         for_each_netdev(&init_net, state->dev) {
2326                 struct inet6_dev *idev;
2327                 idev = in6_dev_get(state->dev);
2328                 if (!idev)
2329                         continue;
2330                 read_lock_bh(&idev->lock);
2331                 im = idev->mc_list;
2332                 if (im) {
2333                         state->idev = idev;
2334                         break;
2335                 }
2336                 read_unlock_bh(&idev->lock);
2337                 in6_dev_put(idev);
2338         }
2339         return im;
2340 }
2341
2342 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2343 {
2344         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2345
2346         im = im->next;
2347         while (!im) {
2348                 if (likely(state->idev != NULL)) {
2349                         read_unlock_bh(&state->idev->lock);
2350                         in6_dev_put(state->idev);
2351                 }
2352                 state->dev = next_net_device(state->dev);
2353                 if (!state->dev) {
2354                         state->idev = NULL;
2355                         break;
2356                 }
2357                 state->idev = in6_dev_get(state->dev);
2358                 if (!state->idev)
2359                         continue;
2360                 read_lock_bh(&state->idev->lock);
2361                 im = state->idev->mc_list;
2362         }
2363         return im;
2364 }
2365
2366 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2367 {
2368         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2369         if (im)
2370                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2371                         --pos;
2372         return pos ? NULL : im;
2373 }
2374
2375 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2376 {
2377         read_lock(&dev_base_lock);
2378         return igmp6_mc_get_idx(seq, *pos);
2379 }
2380
2381 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2382 {
2383         struct ifmcaddr6 *im;
2384         im = igmp6_mc_get_next(seq, v);
2385         ++*pos;
2386         return im;
2387 }
2388
2389 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2390 {
2391         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2392         if (likely(state->idev != NULL)) {
2393                 read_unlock_bh(&state->idev->lock);
2394                 in6_dev_put(state->idev);
2395                 state->idev = NULL;
2396         }
2397         state->dev = NULL;
2398         read_unlock(&dev_base_lock);
2399 }
2400
2401 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2402 {
2403         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2404         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2405
2406         seq_printf(seq,
2407                    "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2408                    state->dev->ifindex, state->dev->name,
2409                    NIP6(im->mca_addr),
2410                    im->mca_users, im->mca_flags,
2411                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2412                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2413         return 0;
2414 }
2415
2416 static const struct seq_operations igmp6_mc_seq_ops = {
2417         .start  =       igmp6_mc_seq_start,
2418         .next   =       igmp6_mc_seq_next,
2419         .stop   =       igmp6_mc_seq_stop,
2420         .show   =       igmp6_mc_seq_show,
2421 };
2422
2423 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2424 {
2425         return seq_open_private(file, &igmp6_mc_seq_ops,
2426                         sizeof(struct igmp6_mc_iter_state));
2427 }
2428
2429 static const struct file_operations igmp6_mc_seq_fops = {
2430         .owner          =       THIS_MODULE,
2431         .open           =       igmp6_mc_seq_open,
2432         .read           =       seq_read,
2433         .llseek         =       seq_lseek,
2434         .release        =       seq_release_private,
2435 };
2436
2437 struct igmp6_mcf_iter_state {
2438         struct net_device *dev;
2439         struct inet6_dev *idev;
2440         struct ifmcaddr6 *im;
2441 };
2442
2443 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2444
2445 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2446 {
2447         struct ip6_sf_list *psf = NULL;
2448         struct ifmcaddr6 *im = NULL;
2449         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2450
2451         state->idev = NULL;
2452         state->im = NULL;
2453         for_each_netdev(&init_net, state->dev) {
2454                 struct inet6_dev *idev;
2455                 idev = in6_dev_get(state->dev);
2456                 if (unlikely(idev == NULL))
2457                         continue;
2458                 read_lock_bh(&idev->lock);
2459                 im = idev->mc_list;
2460                 if (likely(im != NULL)) {
2461                         spin_lock_bh(&im->mca_lock);
2462                         psf = im->mca_sources;
2463                         if (likely(psf != NULL)) {
2464                                 state->im = im;
2465                                 state->idev = idev;
2466                                 break;
2467                         }
2468                         spin_unlock_bh(&im->mca_lock);
2469                 }
2470                 read_unlock_bh(&idev->lock);
2471                 in6_dev_put(idev);
2472         }
2473         return psf;
2474 }
2475
2476 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2477 {
2478         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2479
2480         psf = psf->sf_next;
2481         while (!psf) {
2482                 spin_unlock_bh(&state->im->mca_lock);
2483                 state->im = state->im->next;
2484                 while (!state->im) {
2485                         if (likely(state->idev != NULL)) {
2486                                 read_unlock_bh(&state->idev->lock);
2487                                 in6_dev_put(state->idev);
2488                         }
2489                         state->dev = next_net_device(state->dev);
2490                         if (!state->dev) {
2491                                 state->idev = NULL;
2492                                 goto out;
2493                         }
2494                         state->idev = in6_dev_get(state->dev);
2495                         if (!state->idev)
2496                                 continue;
2497                         read_lock_bh(&state->idev->lock);
2498                         state->im = state->idev->mc_list;
2499                 }
2500                 if (!state->im)
2501                         break;
2502                 spin_lock_bh(&state->im->mca_lock);
2503                 psf = state->im->mca_sources;
2504         }
2505 out:
2506         return psf;
2507 }
2508
2509 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2510 {
2511         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2512         if (psf)
2513                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2514                         --pos;
2515         return pos ? NULL : psf;
2516 }
2517
2518 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2519 {
2520         read_lock(&dev_base_lock);
2521         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2522 }
2523
2524 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2525 {
2526         struct ip6_sf_list *psf;
2527         if (v == SEQ_START_TOKEN)
2528                 psf = igmp6_mcf_get_first(seq);
2529         else
2530                 psf = igmp6_mcf_get_next(seq, v);
2531         ++*pos;
2532         return psf;
2533 }
2534
2535 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2536 {
2537         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2538         if (likely(state->im != NULL)) {
2539                 spin_unlock_bh(&state->im->mca_lock);
2540                 state->im = NULL;
2541         }
2542         if (likely(state->idev != NULL)) {
2543                 read_unlock_bh(&state->idev->lock);
2544                 in6_dev_put(state->idev);
2545                 state->idev = NULL;
2546         }
2547         state->dev = NULL;
2548         read_unlock(&dev_base_lock);
2549 }
2550
2551 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2552 {
2553         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2554         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2555
2556         if (v == SEQ_START_TOKEN) {
2557                 seq_printf(seq,
2558                            "%3s %6s "
2559                            "%32s %32s %6s %6s\n", "Idx",
2560                            "Device", "Multicast Address",
2561                            "Source Address", "INC", "EXC");
2562         } else {
2563                 seq_printf(seq,
2564                            "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2565                            state->dev->ifindex, state->dev->name,
2566                            NIP6(state->im->mca_addr),
2567                            NIP6(psf->sf_addr),
2568                            psf->sf_count[MCAST_INCLUDE],
2569                            psf->sf_count[MCAST_EXCLUDE]);
2570         }
2571         return 0;
2572 }
2573
2574 static const struct seq_operations igmp6_mcf_seq_ops = {
2575         .start  =       igmp6_mcf_seq_start,
2576         .next   =       igmp6_mcf_seq_next,
2577         .stop   =       igmp6_mcf_seq_stop,
2578         .show   =       igmp6_mcf_seq_show,
2579 };
2580
2581 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2582 {
2583         return seq_open_private(file, &igmp6_mcf_seq_ops,
2584                         sizeof(struct igmp6_mcf_iter_state));
2585 }
2586
2587 static const struct file_operations igmp6_mcf_seq_fops = {
2588         .owner          =       THIS_MODULE,
2589         .open           =       igmp6_mcf_seq_open,
2590         .read           =       seq_read,
2591         .llseek         =       seq_lseek,
2592         .release        =       seq_release_private,
2593 };
2594 #endif
2595
2596 int __init igmp6_init(struct net_proto_family *ops)
2597 {
2598         struct ipv6_pinfo *np;
2599         struct sock *sk;
2600         int err;
2601
2602         err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2603         if (err < 0) {
2604                 printk(KERN_ERR
2605                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2606                        err);
2607                 igmp6_socket = NULL; /* For safety. */
2608                 return err;
2609         }
2610
2611         sk = igmp6_socket->sk;
2612         sk->sk_allocation = GFP_ATOMIC;
2613         sk->sk_prot->unhash(sk);
2614
2615         np = inet6_sk(sk);
2616         np->hop_limit = 1;
2617
2618 #ifdef CONFIG_PROC_FS
2619         proc_net_fops_create(&init_net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2620         proc_net_fops_create(&init_net, "mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2621 #endif
2622
2623         return 0;
2624 }
2625
2626 void igmp6_cleanup(void)
2627 {
2628         sock_release(igmp6_socket);
2629         igmp6_socket = NULL; /* for safety */
2630
2631 #ifdef CONFIG_PROC_FS
2632         proc_net_remove(&init_net, "mcfilter6");
2633         proc_net_remove(&init_net, "igmp6");
2634 #endif
2635 }