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   1 /*
   2  *      Multicast support for IPv6
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 /* Changes:
  17  *
  18  *      yoshfuji        : fix format of router-alert option
  19  *      YOSHIFUJI Hideaki @USAGI:
  20  *              Fixed source address for MLD message based on
  21  *              <draft-ietf-magma-mld-source-05.txt>.
  22  *      YOSHIFUJI Hideaki @USAGI:
  23  *              - Ignore Queries for invalid addresses.
  24  *              - MLD for link-local addresses.
  25  *      David L Stevens <dlstevens@us.ibm.com>:
  26  *              - MLDv2 support
  27  */
  28
  29 #include <linux/module.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/string.h>
  33 #include <linux/socket.h>
  34 #include <linux/sockios.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/times.h>
  37 #include <linux/net.h>
  38 #include <linux/in.h>
  39 #include <linux/in6.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/route.h>
  43 #include <linux/init.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/seq_file.h>
  46
  47 #include <linux/netfilter.h>
  48 #include <linux/netfilter_ipv6.h>
  49
  50 #include <net/net_namespace.h>
  51 #include <net/sock.h>
  52 #include <net/snmp.h>
  53
  54 #include <net/ipv6.h>
  55 #include <net/protocol.h>
  56 #include <net/if_inet6.h>
  57 #include <net/ndisc.h>
  58 #include <net/addrconf.h>
  59 #include <net/ip6_route.h>
  60 #include <net/inet_common.h>
  61
  62 #include <net/ip6_checksum.h>
  63
  64 /* Set to 3 to get tracing... */
  65 #define MCAST_DEBUG 2
  66
  67 #if MCAST_DEBUG >= 3
  68 #define MDBG(x) printk x
  69 #else
  70 #define MDBG(x)
  71 #endif
  72
  73 /*
  74  *  These header formats should be in a separate include file, but icmpv6.h
  75  *  doesn't have in6_addr defined in all cases, there is no __u128, and no
  76  *  other files reference these.
  77  *
  78  *                      +-DLS 4/14/03
  79  */
  80
  81 /* Multicast Listener Discovery version 2 headers */
  82
  83 struct mld2_grec {
  84         __u8            grec_type;
  85         __u8            grec_auxwords;
  86         __be16          grec_nsrcs;
  87         struct in6_addr grec_mca;
  88         struct in6_addr grec_src[0];
  89 };
  90
  91 struct mld2_report {
  92         __u8    type;
  93         __u8    resv1;
  94         __sum16 csum;
  95         __be16  resv2;
  96         __be16  ngrec;
  97         struct mld2_grec grec[0];
  98 };
  99
 100 struct mld2_query {
 101         __u8 type;
 102         __u8 code;
 103         __sum16 csum;
 104         __be16 mrc;
 105         __be16 resv1;
 106         struct in6_addr mca;
 107 #if defined(__LITTLE_ENDIAN_BITFIELD)
 108         __u8 qrv:3,
 109              suppress:1,
 110              resv2:4;
 111 #elif defined(__BIG_ENDIAN_BITFIELD)
 112         __u8 resv2:4,
 113              suppress:1,
 114              qrv:3;
 115 #else
 116 #error "Please fix <asm/byteorder.h>"
 117 #endif
 118         __u8 qqic;
 119         __be16 nsrcs;
 120         struct in6_addr srcs[0];
 121 };
 122
 123 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 124
 125 /* Big mc list lock for all the sockets */
 126 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
 127
 128 static void igmp6_join_group(struct ifmcaddr6 *ma);
 129 static void igmp6_leave_group(struct ifmcaddr6 *ma);
 130 static void igmp6_timer_handler(unsigned long data);
 131
 132 static void mld_gq_timer_expire(unsigned long data);
 133 static void mld_ifc_timer_expire(unsigned long data);
 134 static void mld_ifc_event(struct inet6_dev *idev);
 135 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 136 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
 137 static void mld_clear_delrec(struct inet6_dev *idev);
 138 static int sf_setstate(struct ifmcaddr6 *pmc);
 139 static void sf_markstate(struct ifmcaddr6 *pmc);
 140 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 141 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
 142                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 143                           int delta);
 144 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
 145                           int sfmode, int sfcount, struct in6_addr *psfsrc,
 146                           int delta);
 147 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 148                             struct inet6_dev *idev);
 149
 150
 151 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
 152 #define MLD_QRV_DEFAULT         2
 153
 154 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
 155                 (idev)->cnf.force_mld_version == 1 || \
 156                 ((idev)->mc_v1_seen && \
 157                 time_before(jiffies, (idev)->mc_v1_seen)))
 158
 159 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
 160 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
 161         ((value) < (thresh) ? (value) : \
 162         ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
 163         (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
 164
 165 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
 166
 167 #define IPV6_MLD_MAX_MSF        64
 168
 169 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 170
 171 /*
 172  *      socket join on multicast group
 173  */
 174
 175 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 176 {
 177         struct net_device *dev = NULL;
 178         struct ipv6_mc_socklist *mc_lst;
 179         struct ipv6_pinfo *np = inet6_sk(sk);
 180         struct net *net = sock_net(sk);
 181         int err;
 182
 183         if (!ipv6_addr_is_multicast(addr))
 184                 return -EINVAL;
 185
 186         read_lock_bh(&ipv6_sk_mc_lock);
 187         for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
 188                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 189                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 190                         read_unlock_bh(&ipv6_sk_mc_lock);
 191                         return -EADDRINUSE;
 192                 }
 193         }
 194         read_unlock_bh(&ipv6_sk_mc_lock);
 195
 196         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 197
 198         if (mc_lst == NULL)
 199                 return -ENOMEM;
 200
 201         mc_lst->next = NULL;
 202         ipv6_addr_copy(&mc_lst->addr, addr);
 203
 204         if (ifindex == 0) {
 205                 struct rt6_info *rt;
 206                 rt = rt6_lookup(net, addr, NULL, 0, 0);
 207                 if (rt) {
 208                         dev = rt->rt6i_dev;
 209                         dev_hold(dev);
 210                         dst_release(&rt->u.dst);
 211                 }
 212         } else
 213                 dev = dev_get_by_index(net, ifindex);
 214
 215         if (dev == NULL) {
 216                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 217                 return -ENODEV;
 218         }
 219
 220         mc_lst->ifindex = dev->ifindex;
 221         mc_lst->sfmode = MCAST_EXCLUDE;
 222         rwlock_init(&mc_lst->sflock);
 223         mc_lst->sflist = NULL;
 224
 225         /*
 226          *      now add/increase the group membership on the device
 227          */
 228
 229         err = ipv6_dev_mc_inc(dev, addr);
 230
 231         if (err) {
 232                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 233                 dev_put(dev);
 234                 return err;
 235         }
 236
 237         write_lock_bh(&ipv6_sk_mc_lock);
 238         mc_lst->next = np->ipv6_mc_list;
 239         np->ipv6_mc_list = mc_lst;
 240         write_unlock_bh(&ipv6_sk_mc_lock);
 241
 242         dev_put(dev);
 243
 244         return 0;
 245 }
 246
 247 /*
 248  *      socket leave on multicast group
 249  */
 250 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 251 {
 252         struct ipv6_pinfo *np = inet6_sk(sk);
 253         struct ipv6_mc_socklist *mc_lst, **lnk;
 254         struct net *net = sock_net(sk);
 255
 256         write_lock_bh(&ipv6_sk_mc_lock);
 257         for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
 258                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 259                     ipv6_addr_equal(&mc_lst->addr, addr)) {
 260                         struct net_device *dev;
 261
 262                         *lnk = mc_lst->next;
 263                         write_unlock_bh(&ipv6_sk_mc_lock);
 264
 265                         dev = dev_get_by_index(net, mc_lst->ifindex);
 266                         if (dev != NULL) {
 267                                 struct inet6_dev *idev = in6_dev_get(dev);
 268
 269                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
 270                                 if (idev) {
 271                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
 272                                         in6_dev_put(idev);
 273                                 }
 274                                 dev_put(dev);
 275                         } else
 276                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
 277                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 278                         return 0;
 279                 }
 280         }
 281         write_unlock_bh(&ipv6_sk_mc_lock);
 282
 283         return -EADDRNOTAVAIL;
 284 }
 285
 286 static struct inet6_dev *ip6_mc_find_dev(struct net *net,
 287                                          struct in6_addr *group,
 288                                          int ifindex)
 289 {
 290         struct net_device *dev = NULL;
 291         struct inet6_dev *idev = NULL;
 292
 293         if (ifindex == 0) {
 294                 struct rt6_info *rt;
 295
 296                 rt = rt6_lookup(net, group, NULL, 0, 0);
 297                 if (rt) {
 298                         dev = rt->rt6i_dev;
 299                         dev_hold(dev);
 300                         dst_release(&rt->u.dst);
 301                 }
 302         } else
 303                 dev = dev_get_by_index(net, ifindex);
 304
 305         if (!dev)
 306                 return NULL;
 307         idev = in6_dev_get(dev);
 308         if (!idev) {
 309                 dev_put(dev);
 310                 return NULL;
 311         }
 312         read_lock_bh(&idev->lock);
 313         if (idev->dead) {
 314                 read_unlock_bh(&idev->lock);
 315                 in6_dev_put(idev);
 316                 dev_put(dev);
 317                 return NULL;
 318         }
 319         return idev;
 320 }
 321
 322 void ipv6_sock_mc_close(struct sock *sk)
 323 {
 324         struct ipv6_pinfo *np = inet6_sk(sk);
 325         struct ipv6_mc_socklist *mc_lst;
 326         struct net *net = sock_net(sk);
 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(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         struct net *net = sock_net(sk);
 365         int i, j, rv;
 366         int leavegroup = 0;
 367         int pmclocked = 0;
 368         int err;
 369
 370         if (pgsr->gsr_group.ss_family != AF_INET6 ||
 371             pgsr->gsr_source.ss_family != AF_INET6)
 372                 return -EINVAL;
 373
 374         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 375         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 376
 377         if (!ipv6_addr_is_multicast(group))
 378                 return -EINVAL;
 379
 380         idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
 381         if (!idev)
 382                 return -ENODEV;
 383         dev = idev->dev;
 384
 385         err = -EADDRNOTAVAIL;
 386
 387         read_lock_bh(&ipv6_sk_mc_lock);
 388         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 389                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 390                         continue;
 391                 if (ipv6_addr_equal(&pmc->addr, group))
 392                         break;
 393         }
 394         if (!pmc) {             /* must have a prior join */
 395                 err = -EINVAL;
 396                 goto done;
 397         }
 398         /* if a source filter was set, must be the same mode as before */
 399         if (pmc->sflist) {
 400                 if (pmc->sfmode != omode) {
 401                         err = -EINVAL;
 402                         goto done;
 403                 }
 404         } else if (pmc->sfmode != omode) {
 405                 /* allow mode switches for empty-set filters */
 406                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 407                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 408                 pmc->sfmode = omode;
 409         }
 410
 411         write_lock_bh(&pmc->sflock);
 412         pmclocked = 1;
 413
 414         psl = pmc->sflist;
 415         if (!add) {
 416                 if (!psl)
 417                         goto done;      /* err = -EADDRNOTAVAIL */
 418                 rv = !0;
 419                 for (i=0; i<psl->sl_count; i++) {
 420                         rv = memcmp(&psl->sl_addr[i], source,
 421                                 sizeof(struct in6_addr));
 422                         if (rv == 0)
 423                                 break;
 424                 }
 425                 if (rv)         /* source not found */
 426                         goto done;      /* err = -EADDRNOTAVAIL */
 427
 428                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
 429                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 430                         leavegroup = 1;
 431                         goto done;
 432                 }
 433
 434                 /* update the interface filter */
 435                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
 436
 437                 for (j=i+1; j<psl->sl_count; j++)
 438                         psl->sl_addr[j-1] = psl->sl_addr[j];
 439                 psl->sl_count--;
 440                 err = 0;
 441                 goto done;
 442         }
 443         /* else, add a new source to the filter */
 444
 445         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 446                 err = -ENOBUFS;
 447                 goto done;
 448         }
 449         if (!psl || psl->sl_count == psl->sl_max) {
 450                 struct ip6_sf_socklist *newpsl;
 451                 int count = IP6_SFBLOCK;
 452
 453                 if (psl)
 454                         count += psl->sl_max;
 455                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 456                 if (!newpsl) {
 457                         err = -ENOBUFS;
 458                         goto done;
 459                 }
 460                 newpsl->sl_max = count;
 461                 newpsl->sl_count = count - IP6_SFBLOCK;
 462                 if (psl) {
 463                         for (i=0; i<psl->sl_count; i++)
 464                                 newpsl->sl_addr[i] = psl->sl_addr[i];
 465                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 466                 }
 467                 pmc->sflist = psl = newpsl;
 468         }
 469         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
 470         for (i=0; i<psl->sl_count; i++) {
 471                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 472                 if (rv == 0)
 473                         break;
 474         }
 475         if (rv == 0)            /* address already there is an error */
 476                 goto done;
 477         for (j=psl->sl_count-1; j>=i; j--)
 478                 psl->sl_addr[j+1] = psl->sl_addr[j];
 479         psl->sl_addr[i] = *source;
 480         psl->sl_count++;
 481         err = 0;
 482         /* update the interface list */
 483         ip6_mc_add_src(idev, group, omode, 1, source, 1);
 484 done:
 485         if (pmclocked)
 486                 write_unlock_bh(&pmc->sflock);
 487         read_unlock_bh(&ipv6_sk_mc_lock);
 488         read_unlock_bh(&idev->lock);
 489         in6_dev_put(idev);
 490         dev_put(dev);
 491         if (leavegroup)
 492                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 493         return err;
 494 }
 495
 496 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 497 {
 498         struct in6_addr *group;
 499         struct ipv6_mc_socklist *pmc;
 500         struct net_device *dev;
 501         struct inet6_dev *idev;
 502         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 503         struct ip6_sf_socklist *newpsl, *psl;
 504         struct net *net = sock_net(sk);
 505         int leavegroup = 0;
 506         int i, err;
 507
 508         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 509
 510         if (!ipv6_addr_is_multicast(group))
 511                 return -EINVAL;
 512         if (gsf->gf_fmode != MCAST_INCLUDE &&
 513             gsf->gf_fmode != MCAST_EXCLUDE)
 514                 return -EINVAL;
 515
 516         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 517
 518         if (!idev)
 519                 return -ENODEV;
 520         dev = idev->dev;
 521
 522         err = 0;
 523         read_lock_bh(&ipv6_sk_mc_lock);
 524
 525         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 526                 leavegroup = 1;
 527                 goto done;
 528         }
 529
 530         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 531                 if (pmc->ifindex != gsf->gf_interface)
 532                         continue;
 533                 if (ipv6_addr_equal(&pmc->addr, group))
 534                         break;
 535         }
 536         if (!pmc) {             /* must have a prior join */
 537                 err = -EINVAL;
 538                 goto done;
 539         }
 540         if (gsf->gf_numsrc) {
 541                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 542                                                           GFP_ATOMIC);
 543                 if (!newpsl) {
 544                         err = -ENOBUFS;
 545                         goto done;
 546                 }
 547                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 548                 for (i=0; i<newpsl->sl_count; ++i) {
 549                         struct sockaddr_in6 *psin6;
 550
 551                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 552                         newpsl->sl_addr[i] = psin6->sin6_addr;
 553                 }
 554                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 555                         newpsl->sl_count, newpsl->sl_addr, 0);
 556                 if (err) {
 557                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 558                         goto done;
 559                 }
 560         } else {
 561                 newpsl = NULL;
 562                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 563         }
 564
 565         write_lock_bh(&pmc->sflock);
 566         psl = pmc->sflist;
 567         if (psl) {
 568                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
 569                         psl->sl_count, psl->sl_addr, 0);
 570                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 571         } else
 572                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 573         pmc->sflist = newpsl;
 574         pmc->sfmode = gsf->gf_fmode;
 575         write_unlock_bh(&pmc->sflock);
 576         err = 0;
 577 done:
 578         read_unlock_bh(&ipv6_sk_mc_lock);
 579         read_unlock_bh(&idev->lock);
 580         in6_dev_put(idev);
 581         dev_put(dev);
 582         if (leavegroup)
 583                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 584         return err;
 585 }
 586
 587 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 588         struct group_filter __user *optval, int __user *optlen)
 589 {
 590         int err, i, count, copycount;
 591         struct in6_addr *group;
 592         struct ipv6_mc_socklist *pmc;
 593         struct inet6_dev *idev;
 594         struct net_device *dev;
 595         struct ipv6_pinfo *inet6 = inet6_sk(sk);
 596         struct ip6_sf_socklist *psl;
 597         struct net *net = sock_net(sk);
 598
 599         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 600
 601         if (!ipv6_addr_is_multicast(group))
 602                 return -EINVAL;
 603
 604         idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
 605
 606         if (!idev)
 607                 return -ENODEV;
 608
 609         dev = idev->dev;
 610
 611         err = -EADDRNOTAVAIL;
 612         /*
 613          * changes to the ipv6_mc_list require the socket lock and
 614          * a read lock on ip6_sk_mc_lock. We have the socket lock,
 615          * so reading the list is safe.
 616          */
 617
 618         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
 619                 if (pmc->ifindex != gsf->gf_interface)
 620                         continue;
 621                 if (ipv6_addr_equal(group, &pmc->addr))
 622                         break;
 623         }
 624         if (!pmc)               /* must have a prior join */
 625                 goto done;
 626         gsf->gf_fmode = pmc->sfmode;
 627         psl = pmc->sflist;
 628         count = psl ? psl->sl_count : 0;
 629         read_unlock_bh(&idev->lock);
 630         in6_dev_put(idev);
 631         dev_put(dev);
 632
 633         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 634         gsf->gf_numsrc = count;
 635         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 636             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 637                 return -EFAULT;
 638         }
 639         /* changes to psl require the socket lock, a read lock on
 640          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 641          * have the socket lock, so reading here is safe.
 642          */
 643         for (i=0; i<copycount; i++) {
 644                 struct sockaddr_in6 *psin6;
 645                 struct sockaddr_storage ss;
 646
 647                 psin6 = (struct sockaddr_in6 *)&ss;
 648                 memset(&ss, 0, sizeof(ss));
 649                 psin6->sin6_family = AF_INET6;
 650                 psin6->sin6_addr = psl->sl_addr[i];
 651                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 652                         return -EFAULT;
 653         }
 654         return 0;
 655 done:
 656         read_unlock_bh(&idev->lock);
 657         in6_dev_put(idev);
 658         dev_put(dev);
 659         return err;
 660 }
 661
 662 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 663                    const struct in6_addr *src_addr)
 664 {
 665         struct ipv6_pinfo *np = inet6_sk(sk);
 666         struct ipv6_mc_socklist *mc;
 667         struct ip6_sf_socklist *psl;
 668         int rv = 1;
 669
 670         read_lock(&ipv6_sk_mc_lock);
 671         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
 672                 if (ipv6_addr_equal(&mc->addr, mc_addr))
 673                         break;
 674         }
 675         if (!mc) {
 676                 read_unlock(&ipv6_sk_mc_lock);
 677                 return 1;
 678         }
 679         read_lock(&mc->sflock);
 680         psl = mc->sflist;
 681         if (!psl) {
 682                 rv = mc->sfmode == MCAST_EXCLUDE;
 683         } else {
 684                 int i;
 685
 686                 for (i=0; i<psl->sl_count; i++) {
 687                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 688                                 break;
 689                 }
 690                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 691                         rv = 0;
 692                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 693                         rv = 0;
 694         }
 695         read_unlock(&mc->sflock);
 696         read_unlock(&ipv6_sk_mc_lock);
 697
 698         return rv;
 699 }
 700
 701 static void ma_put(struct ifmcaddr6 *mc)
 702 {
 703         if (atomic_dec_and_test(&mc->mca_refcnt)) {
 704                 in6_dev_put(mc->idev);
 705                 kfree(mc);
 706         }
 707 }
 708
 709 static void igmp6_group_added(struct ifmcaddr6 *mc)
 710 {
 711         struct net_device *dev = mc->idev->dev;
 712         char buf[MAX_ADDR_LEN];
 713
 714         spin_lock_bh(&mc->mca_lock);
 715         if (!(mc->mca_flags&MAF_LOADED)) {
 716                 mc->mca_flags |= MAF_LOADED;
 717                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 718                         dev_mc_add(dev, buf, dev->addr_len, 0);
 719         }
 720         spin_unlock_bh(&mc->mca_lock);
 721
 722         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 723                 return;
 724
 725         if (MLD_V1_SEEN(mc->idev)) {
 726                 igmp6_join_group(mc);
 727                 return;
 728         }
 729         /* else v2 */
 730
 731         mc->mca_crcount = mc->idev->mc_qrv;
 732         mld_ifc_event(mc->idev);
 733 }
 734
 735 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 736 {
 737         struct net_device *dev = mc->idev->dev;
 738         char buf[MAX_ADDR_LEN];
 739
 740         spin_lock_bh(&mc->mca_lock);
 741         if (mc->mca_flags&MAF_LOADED) {
 742                 mc->mca_flags &= ~MAF_LOADED;
 743                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 744                         dev_mc_delete(dev, buf, dev->addr_len, 0);
 745         }
 746
 747         if (mc->mca_flags & MAF_NOREPORT)
 748                 goto done;
 749         spin_unlock_bh(&mc->mca_lock);
 750
 751         if (!mc->idev->dead)
 752                 igmp6_leave_group(mc);
 753
 754         spin_lock_bh(&mc->mca_lock);
 755         if (del_timer(&mc->mca_timer))
 756                 atomic_dec(&mc->mca_refcnt);
 757 done:
 758         ip6_mc_clear_src(mc);
 759         spin_unlock_bh(&mc->mca_lock);
 760 }
 761
 762 /*
 763  * deleted ifmcaddr6 manipulation
 764  */
 765 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 766 {
 767         struct ifmcaddr6 *pmc;
 768
 769         /* this is an "ifmcaddr6" for convenience; only the fields below
 770          * are actually used. In particular, the refcnt and users are not
 771          * used for management of the delete list. Using the same structure
 772          * for deleted items allows change reports to use common code with
 773          * non-deleted or query-response MCA's.
 774          */
 775         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 776         if (!pmc)
 777                 return;
 778
 779         spin_lock_bh(&im->mca_lock);
 780         spin_lock_init(&pmc->mca_lock);
 781         pmc->idev = im->idev;
 782         in6_dev_hold(idev);
 783         pmc->mca_addr = im->mca_addr;
 784         pmc->mca_crcount = idev->mc_qrv;
 785         pmc->mca_sfmode = im->mca_sfmode;
 786         if (pmc->mca_sfmode == MCAST_INCLUDE) {
 787                 struct ip6_sf_list *psf;
 788
 789                 pmc->mca_tomb = im->mca_tomb;
 790                 pmc->mca_sources = im->mca_sources;
 791                 im->mca_tomb = im->mca_sources = NULL;
 792                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 793                         psf->sf_crcount = pmc->mca_crcount;
 794         }
 795         spin_unlock_bh(&im->mca_lock);
 796
 797         write_lock_bh(&idev->mc_lock);
 798         pmc->next = idev->mc_tomb;
 799         idev->mc_tomb = pmc;
 800         write_unlock_bh(&idev->mc_lock);
 801 }
 802
 803 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
 804 {
 805         struct ifmcaddr6 *pmc, *pmc_prev;
 806         struct ip6_sf_list *psf, *psf_next;
 807
 808         write_lock_bh(&idev->mc_lock);
 809         pmc_prev = NULL;
 810         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 811                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 812                         break;
 813                 pmc_prev = pmc;
 814         }
 815         if (pmc) {
 816                 if (pmc_prev)
 817                         pmc_prev->next = pmc->next;
 818                 else
 819                         idev->mc_tomb = pmc->next;
 820         }
 821         write_unlock_bh(&idev->mc_lock);
 822         if (pmc) {
 823                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 824                         psf_next = psf->sf_next;
 825                         kfree(psf);
 826                 }
 827                 in6_dev_put(pmc->idev);
 828                 kfree(pmc);
 829         }
 830 }
 831
 832 static void mld_clear_delrec(struct inet6_dev *idev)
 833 {
 834         struct ifmcaddr6 *pmc, *nextpmc;
 835
 836         write_lock_bh(&idev->mc_lock);
 837         pmc = idev->mc_tomb;
 838         idev->mc_tomb = NULL;
 839         write_unlock_bh(&idev->mc_lock);
 840
 841         for (; pmc; pmc = nextpmc) {
 842                 nextpmc = pmc->next;
 843                 ip6_mc_clear_src(pmc);
 844                 in6_dev_put(pmc->idev);
 845                 kfree(pmc);
 846         }
 847
 848         /* clear dead sources, too */
 849         read_lock_bh(&idev->lock);
 850         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 851                 struct ip6_sf_list *psf, *psf_next;
 852
 853                 spin_lock_bh(&pmc->mca_lock);
 854                 psf = pmc->mca_tomb;
 855                 pmc->mca_tomb = NULL;
 856                 spin_unlock_bh(&pmc->mca_lock);
 857                 for (; psf; psf=psf_next) {
 858                         psf_next = psf->sf_next;
 859                         kfree(psf);
 860                 }
 861         }
 862         read_unlock_bh(&idev->lock);
 863 }
 864
 865
 866 /*
 867  *      device multicast group inc (add if not found)
 868  */
 869 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 870 {
 871         struct ifmcaddr6 *mc;
 872         struct inet6_dev *idev;
 873
 874         idev = in6_dev_get(dev);
 875
 876         if (idev == NULL)
 877                 return -EINVAL;
 878
 879         write_lock_bh(&idev->lock);
 880         if (idev->dead) {
 881                 write_unlock_bh(&idev->lock);
 882                 in6_dev_put(idev);
 883                 return -ENODEV;
 884         }
 885
 886         for (mc = idev->mc_list; mc; mc = mc->next) {
 887                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 888                         mc->mca_users++;
 889                         write_unlock_bh(&idev->lock);
 890                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 891                                 NULL, 0);
 892                         in6_dev_put(idev);
 893                         return 0;
 894                 }
 895         }
 896
 897         /*
 898          *      not found: create a new one.
 899          */
 900
 901         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 902
 903         if (mc == NULL) {
 904                 write_unlock_bh(&idev->lock);
 905                 in6_dev_put(idev);
 906                 return -ENOMEM;
 907         }
 908
 909         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 910
 911         ipv6_addr_copy(&mc->mca_addr, addr);
 912         mc->idev = idev;
 913         mc->mca_users = 1;
 914         /* mca_stamp should be updated upon changes */
 915         mc->mca_cstamp = mc->mca_tstamp = jiffies;
 916         atomic_set(&mc->mca_refcnt, 2);
 917         spin_lock_init(&mc->mca_lock);
 918
 919         /* initial mode is (EX, empty) */
 920         mc->mca_sfmode = MCAST_EXCLUDE;
 921         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 922
 923         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 924             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 925                 mc->mca_flags |= MAF_NOREPORT;
 926
 927         mc->next = idev->mc_list;
 928         idev->mc_list = mc;
 929         write_unlock_bh(&idev->lock);
 930
 931         mld_del_delrec(idev, &mc->mca_addr);
 932         igmp6_group_added(mc);
 933         ma_put(mc);
 934         return 0;
 935 }
 936
 937 /*
 938  *      device multicast group del
 939  */
 940 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 941 {
 942         struct ifmcaddr6 *ma, **map;
 943
 944         write_lock_bh(&idev->lock);
 945         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 946                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 947                         if (--ma->mca_users == 0) {
 948                                 *map = ma->next;
 949                                 write_unlock_bh(&idev->lock);
 950
 951                                 igmp6_group_dropped(ma);
 952
 953                                 ma_put(ma);
 954                                 return 0;
 955                         }
 956                         write_unlock_bh(&idev->lock);
 957                         return 0;
 958                 }
 959         }
 960         write_unlock_bh(&idev->lock);
 961
 962         return -ENOENT;
 963 }
 964
 965 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 966 {
 967         struct inet6_dev *idev = in6_dev_get(dev);
 968         int err;
 969
 970         if (!idev)
 971                 return -ENODEV;
 972
 973         err = __ipv6_dev_mc_dec(idev, addr);
 974
 975         in6_dev_put(idev);
 976
 977         return err;
 978 }
 979
 980 /*
 981  * identify MLD packets for MLD filter exceptions
 982  */
 983 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 984 {
 985         struct icmp6hdr *pic;
 986
 987         if (nexthdr != IPPROTO_ICMPV6)
 988                 return 0;
 989
 990         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 991                 return 0;
 992
 993         pic = icmp6_hdr(skb);
 994
 995         switch (pic->icmp6_type) {
 996         case ICMPV6_MGM_QUERY:
 997         case ICMPV6_MGM_REPORT:
 998         case ICMPV6_MGM_REDUCTION:
 999         case ICMPV6_MLD2_REPORT:
1000                 return 1;
1001         default:
1002                 break;
1003         }
1004         return 0;
1005 }
1006
1007 /*
1008  *      check if the interface/address pair is valid
1009  */
1010 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1011                         const struct in6_addr *src_addr)
1012 {
1013         struct inet6_dev *idev;
1014         struct ifmcaddr6 *mc;
1015         int rv = 0;
1016
1017         idev = in6_dev_get(dev);
1018         if (idev) {
1019                 read_lock_bh(&idev->lock);
1020                 for (mc = idev->mc_list; mc; mc=mc->next) {
1021                         if (ipv6_addr_equal(&mc->mca_addr, group))
1022                                 break;
1023                 }
1024                 if (mc) {
1025                         if (src_addr && !ipv6_addr_any(src_addr)) {
1026                                 struct ip6_sf_list *psf;
1027
1028                                 spin_lock_bh(&mc->mca_lock);
1029                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1030                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1031                                                 break;
1032                                 }
1033                                 if (psf)
1034                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1035                                                 psf->sf_count[MCAST_EXCLUDE] !=
1036                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1037                                 else
1038                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1039                                 spin_unlock_bh(&mc->mca_lock);
1040                         } else
1041                                 rv = 1; /* don't filter unspecified source */
1042                 }
1043                 read_unlock_bh(&idev->lock);
1044                 in6_dev_put(idev);
1045         }
1046         return rv;
1047 }
1048
1049 static void mld_gq_start_timer(struct inet6_dev *idev)
1050 {
1051         int tv = net_random() % idev->mc_maxdelay;
1052
1053         idev->mc_gq_running = 1;
1054         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1055                 in6_dev_hold(idev);
1056 }
1057
1058 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1059 {
1060         int tv = net_random() % delay;
1061
1062         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1063                 in6_dev_hold(idev);
1064 }
1065
1066 /*
1067  *      IGMP handling (alias multicast ICMPv6 messages)
1068  */
1069
1070 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1071 {
1072         unsigned long delay = resptime;
1073
1074         /* Do not start timer for these addresses */
1075         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1076             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1077                 return;
1078
1079         if (del_timer(&ma->mca_timer)) {
1080                 atomic_dec(&ma->mca_refcnt);
1081                 delay = ma->mca_timer.expires - jiffies;
1082         }
1083
1084         if (delay >= resptime) {
1085                 if (resptime)
1086                         delay = net_random() % resptime;
1087                 else
1088                         delay = 1;
1089         }
1090         ma->mca_timer.expires = jiffies + delay;
1091         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1092                 atomic_inc(&ma->mca_refcnt);
1093         ma->mca_flags |= MAF_TIMER_RUNNING;
1094 }
1095
1096 /* mark EXCLUDE-mode sources */
1097 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1098         struct in6_addr *srcs)
1099 {
1100         struct ip6_sf_list *psf;
1101         int i, scount;
1102
1103         scount = 0;
1104         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1105                 if (scount == nsrcs)
1106                         break;
1107                 for (i=0; i<nsrcs; i++) {
1108                         /* skip inactive filters */
1109                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1110                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1111                             psf->sf_count[MCAST_EXCLUDE])
1112                                 continue;
1113                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1114                                 scount++;
1115                                 break;
1116                         }
1117                 }
1118         }
1119         pmc->mca_flags &= ~MAF_GSQUERY;
1120         if (scount == nsrcs)    /* all sources excluded */
1121                 return 0;
1122         return 1;
1123 }
1124
1125 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1126         struct in6_addr *srcs)
1127 {
1128         struct ip6_sf_list *psf;
1129         int i, scount;
1130
1131         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1132                 return mld_xmarksources(pmc, nsrcs, srcs);
1133
1134         /* mark INCLUDE-mode sources */
1135
1136         scount = 0;
1137         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1138                 if (scount == nsrcs)
1139                         break;
1140                 for (i=0; i<nsrcs; i++) {
1141                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1142                                 psf->sf_gsresp = 1;
1143                                 scount++;
1144                                 break;
1145                         }
1146                 }
1147         }
1148         if (!scount) {
1149                 pmc->mca_flags &= ~MAF_GSQUERY;
1150                 return 0;
1151         }
1152         pmc->mca_flags |= MAF_GSQUERY;
1153         return 1;
1154 }
1155
1156 int igmp6_event_query(struct sk_buff *skb)
1157 {
1158         struct mld2_query *mlh2 = NULL;
1159         struct ifmcaddr6 *ma;
1160         struct in6_addr *group;
1161         unsigned long max_delay;
1162         struct inet6_dev *idev;
1163         struct icmp6hdr *hdr;
1164         int group_type;
1165         int mark = 0;
1166         int len;
1167
1168         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1169                 return -EINVAL;
1170
1171         /* compute payload length excluding extension headers */
1172         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1173         len -= skb_network_header_len(skb);
1174
1175         /* Drop queries with not link local source */
1176         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1177                 return -EINVAL;
1178
1179         idev = in6_dev_get(skb->dev);
1180
1181         if (idev == NULL)
1182                 return 0;
1183
1184         hdr = icmp6_hdr(skb);
1185         group = (struct in6_addr *) (hdr + 1);
1186         group_type = ipv6_addr_type(group);
1187
1188         if (group_type != IPV6_ADDR_ANY &&
1189             !(group_type&IPV6_ADDR_MULTICAST)) {
1190                 in6_dev_put(idev);
1191                 return -EINVAL;
1192         }
1193
1194         if (len == 24) {
1195                 int switchback;
1196                 /* MLDv1 router present */
1197
1198                 /* Translate milliseconds to jiffies */
1199                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1200
1201                 switchback = (idev->mc_qrv + 1) * max_delay;
1202                 idev->mc_v1_seen = jiffies + switchback;
1203
1204                 /* cancel the interface change timer */
1205                 idev->mc_ifc_count = 0;
1206                 if (del_timer(&idev->mc_ifc_timer))
1207                         __in6_dev_put(idev);
1208                 /* clear deleted report items */
1209                 mld_clear_delrec(idev);
1210         } else if (len >= 28) {
1211                 int srcs_offset = sizeof(struct mld2_query) -
1212                                   sizeof(struct icmp6hdr);
1213                 if (!pskb_may_pull(skb, srcs_offset)) {
1214                         in6_dev_put(idev);
1215                         return -EINVAL;
1216                 }
1217                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1218                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1219                 if (!max_delay)
1220                         max_delay = 1;
1221                 idev->mc_maxdelay = max_delay;
1222                 if (mlh2->qrv)
1223                         idev->mc_qrv = mlh2->qrv;
1224                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1225                         if (mlh2->nsrcs) {
1226                                 in6_dev_put(idev);
1227                                 return -EINVAL; /* no sources allowed */
1228                         }
1229                         mld_gq_start_timer(idev);
1230                         in6_dev_put(idev);
1231                         return 0;
1232                 }
1233                 /* mark sources to include, if group & source-specific */
1234                 if (mlh2->nsrcs != 0) {
1235                         if (!pskb_may_pull(skb, srcs_offset +
1236                             ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1237                                 in6_dev_put(idev);
1238                                 return -EINVAL;
1239                         }
1240                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1241                         mark = 1;
1242                 }
1243         } else {
1244                 in6_dev_put(idev);
1245                 return -EINVAL;
1246         }
1247
1248         read_lock_bh(&idev->lock);
1249         if (group_type == IPV6_ADDR_ANY) {
1250                 for (ma = idev->mc_list; ma; ma=ma->next) {
1251                         spin_lock_bh(&ma->mca_lock);
1252                         igmp6_group_queried(ma, max_delay);
1253                         spin_unlock_bh(&ma->mca_lock);
1254                 }
1255         } else {
1256                 for (ma = idev->mc_list; ma; ma=ma->next) {
1257                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1258                                 continue;
1259                         spin_lock_bh(&ma->mca_lock);
1260                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1261                                 /* gsquery <- gsquery && mark */
1262                                 if (!mark)
1263                                         ma->mca_flags &= ~MAF_GSQUERY;
1264                         } else {
1265                                 /* gsquery <- mark */
1266                                 if (mark)
1267                                         ma->mca_flags |= MAF_GSQUERY;
1268                                 else
1269                                         ma->mca_flags &= ~MAF_GSQUERY;
1270                         }
1271                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1272                             mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1273                                 igmp6_group_queried(ma, max_delay);
1274                         spin_unlock_bh(&ma->mca_lock);
1275                         break;
1276                 }
1277         }
1278         read_unlock_bh(&idev->lock);
1279         in6_dev_put(idev);
1280
1281         return 0;
1282 }
1283
1284
1285 int igmp6_event_report(struct sk_buff *skb)
1286 {
1287         struct ifmcaddr6 *ma;
1288         struct in6_addr *addrp;
1289         struct inet6_dev *idev;
1290         struct icmp6hdr *hdr;
1291         int addr_type;
1292
1293         /* Our own report looped back. Ignore it. */
1294         if (skb->pkt_type == PACKET_LOOPBACK)
1295                 return 0;
1296
1297         /* send our report if the MC router may not have heard this report */
1298         if (skb->pkt_type != PACKET_MULTICAST &&
1299             skb->pkt_type != PACKET_BROADCAST)
1300                 return 0;
1301
1302         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1303                 return -EINVAL;
1304
1305         hdr = icmp6_hdr(skb);
1306
1307         /* Drop reports with not link local source */
1308         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1309         if (addr_type != IPV6_ADDR_ANY &&
1310             !(addr_type&IPV6_ADDR_LINKLOCAL))
1311                 return -EINVAL;
1312
1313         addrp = (struct in6_addr *) (hdr + 1);
1314
1315         idev = in6_dev_get(skb->dev);
1316         if (idev == NULL)
1317                 return -ENODEV;
1318
1319         /*
1320          *      Cancel the timer for this group
1321          */
1322
1323         read_lock_bh(&idev->lock);
1324         for (ma = idev->mc_list; ma; ma=ma->next) {
1325                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1326                         spin_lock(&ma->mca_lock);
1327                         if (del_timer(&ma->mca_timer))
1328                                 atomic_dec(&ma->mca_refcnt);
1329                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1330                         spin_unlock(&ma->mca_lock);
1331                         break;
1332                 }
1333         }
1334         read_unlock_bh(&idev->lock);
1335         in6_dev_put(idev);
1336         return 0;
1337 }
1338
1339 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1340         int gdeleted, int sdeleted)
1341 {
1342         switch (type) {
1343         case MLD2_MODE_IS_INCLUDE:
1344         case MLD2_MODE_IS_EXCLUDE:
1345                 if (gdeleted || sdeleted)
1346                         return 0;
1347                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1348                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1349                                 return 1;
1350                         /* don't include if this source is excluded
1351                          * in all filters
1352                          */
1353                         if (psf->sf_count[MCAST_INCLUDE])
1354                                 return type == MLD2_MODE_IS_INCLUDE;
1355                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1356                                 psf->sf_count[MCAST_EXCLUDE];
1357                 }
1358                 return 0;
1359         case MLD2_CHANGE_TO_INCLUDE:
1360                 if (gdeleted || sdeleted)
1361                         return 0;
1362                 return psf->sf_count[MCAST_INCLUDE] != 0;
1363         case MLD2_CHANGE_TO_EXCLUDE:
1364                 if (gdeleted || sdeleted)
1365                         return 0;
1366                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1367                     psf->sf_count[MCAST_INCLUDE])
1368                         return 0;
1369                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1370                         psf->sf_count[MCAST_EXCLUDE];
1371         case MLD2_ALLOW_NEW_SOURCES:
1372                 if (gdeleted || !psf->sf_crcount)
1373                         return 0;
1374                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1375         case MLD2_BLOCK_OLD_SOURCES:
1376                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1377                         return gdeleted || (psf->sf_crcount && sdeleted);
1378                 return psf->sf_crcount && !gdeleted && !sdeleted;
1379         }
1380         return 0;
1381 }
1382
1383 static int
1384 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1385 {
1386         struct ip6_sf_list *psf;
1387         int scount = 0;
1388
1389         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1390                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1391                         continue;
1392                 scount++;
1393         }
1394         return scount;
1395 }
1396
1397 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1398 {
1399         struct net *net = dev_net(dev);
1400         struct sock *sk = net->ipv6.igmp_sk;
1401         struct sk_buff *skb;
1402         struct mld2_report *pmr;
1403         struct in6_addr addr_buf;
1404         const struct in6_addr *saddr;
1405         int err;
1406         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1407                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1408                      IPV6_TLV_PADN, 0 };
1409
1410         /* we assume size > sizeof(ra) here */
1411         skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
1412
1413         if (!skb)
1414                 return NULL;
1415
1416         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1417
1418         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1419                 /* <draft-ietf-magma-mld-source-05.txt>:
1420                  * use unspecified address as the source address
1421                  * when a valid link-local address is not available.
1422                  */
1423                 saddr = &in6addr_any;
1424         } else
1425                 saddr = &addr_buf;
1426
1427         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1428
1429         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1430
1431         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1432         skb_put(skb, sizeof(*pmr));
1433         pmr = (struct mld2_report *)skb_transport_header(skb);
1434         pmr->type = ICMPV6_MLD2_REPORT;
1435         pmr->resv1 = 0;
1436         pmr->csum = 0;
1437         pmr->resv2 = 0;
1438         pmr->ngrec = 0;
1439         return skb;
1440 }
1441
1442 static void mld_sendpack(struct sk_buff *skb)
1443 {
1444         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1445         struct mld2_report *pmr =
1446                               (struct mld2_report *)skb_transport_header(skb);
1447         int payload_len, mldlen;
1448         struct inet6_dev *idev = in6_dev_get(skb->dev);
1449         struct net *net = dev_net(skb->dev);
1450         int err;
1451         struct flowi fl;
1452
1453         IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1454         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1455         mldlen = skb->tail - skb->transport_header;
1456         pip6->payload_len = htons(payload_len);
1457
1458         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1459                 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1460                                              mldlen, 0));
1461
1462         skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1463
1464         if (!skb->dst) {
1465                 err = -ENOMEM;
1466                 goto err_out;
1467         }
1468
1469         icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1470                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1471                          skb->dev->ifindex);
1472
1473         err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1474         if (err)
1475                 goto err_out;
1476
1477         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1478                       dst_output);
1479 out:
1480         if (!err) {
1481                 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1482                 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1483                 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1484         } else
1485                 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1486
1487         if (likely(idev != NULL))
1488                 in6_dev_put(idev);
1489         return;
1490
1491 err_out:
1492         kfree_skb(skb);
1493         goto out;
1494 }
1495
1496 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1497 {
1498         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1499 }
1500
1501 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1502         int type, struct mld2_grec **ppgr)
1503 {
1504         struct net_device *dev = pmc->idev->dev;
1505         struct mld2_report *pmr;
1506         struct mld2_grec *pgr;
1507
1508         if (!skb)
1509                 skb = mld_newpack(dev, dev->mtu);
1510         if (!skb)
1511                 return NULL;
1512         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1513         pgr->grec_type = type;
1514         pgr->grec_auxwords = 0;
1515         pgr->grec_nsrcs = 0;
1516         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1517         pmr = (struct mld2_report *)skb_transport_header(skb);
1518         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1519         *ppgr = pgr;
1520         return skb;
1521 }
1522
1523 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1524         skb_tailroom(skb)) : 0)
1525
1526 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1527         int type, int gdeleted, int sdeleted)
1528 {
1529         struct net_device *dev = pmc->idev->dev;
1530         struct mld2_report *pmr;
1531         struct mld2_grec *pgr = NULL;
1532         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1533         int scount, stotal, first, isquery, truncate;
1534
1535         if (pmc->mca_flags & MAF_NOREPORT)
1536                 return skb;
1537
1538         isquery = type == MLD2_MODE_IS_INCLUDE ||
1539                   type == MLD2_MODE_IS_EXCLUDE;
1540         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1541                     type == MLD2_CHANGE_TO_EXCLUDE;
1542
1543         stotal = scount = 0;
1544
1545         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1546
1547         if (!*psf_list)
1548                 goto empty_source;
1549
1550         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1551
1552         /* EX and TO_EX get a fresh packet, if needed */
1553         if (truncate) {
1554                 if (pmr && pmr->ngrec &&
1555                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1556                         if (skb)
1557                                 mld_sendpack(skb);
1558                         skb = mld_newpack(dev, dev->mtu);
1559                 }
1560         }
1561         first = 1;
1562         psf_prev = NULL;
1563         for (psf=*psf_list; psf; psf=psf_next) {
1564                 struct in6_addr *psrc;
1565
1566                 psf_next = psf->sf_next;
1567
1568                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1569                         psf_prev = psf;
1570                         continue;
1571                 }
1572
1573                 /* clear marks on query responses */
1574                 if (isquery)
1575                         psf->sf_gsresp = 0;
1576
1577                 if (AVAILABLE(skb) < sizeof(*psrc) +
1578                     first*sizeof(struct mld2_grec)) {
1579                         if (truncate && !first)
1580                                 break;   /* truncate these */
1581                         if (pgr)
1582                                 pgr->grec_nsrcs = htons(scount);
1583                         if (skb)
1584                                 mld_sendpack(skb);
1585                         skb = mld_newpack(dev, dev->mtu);
1586                         first = 1;
1587                         scount = 0;
1588                 }
1589                 if (first) {
1590                         skb = add_grhead(skb, pmc, type, &pgr);
1591                         first = 0;
1592                 }
1593                 if (!skb)
1594                         return NULL;
1595                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1596                 *psrc = psf->sf_addr;
1597                 scount++; stotal++;
1598                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1599                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1600                         psf->sf_crcount--;
1601                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1602                                 if (psf_prev)
1603                                         psf_prev->sf_next = psf->sf_next;
1604                                 else
1605                                         *psf_list = psf->sf_next;
1606                                 kfree(psf);
1607                                 continue;
1608                         }
1609                 }
1610                 psf_prev = psf;
1611         }
1612
1613 empty_source:
1614         if (!stotal) {
1615                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1616                     type == MLD2_BLOCK_OLD_SOURCES)
1617                         return skb;
1618                 if (pmc->mca_crcount || isquery) {
1619                         /* make sure we have room for group header */
1620                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1621                                 mld_sendpack(skb);
1622                                 skb = NULL; /* add_grhead will get a new one */
1623                         }
1624                         skb = add_grhead(skb, pmc, type, &pgr);
1625                 }
1626         }
1627         if (pgr)
1628                 pgr->grec_nsrcs = htons(scount);
1629
1630         if (isquery)
1631                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1632         return skb;
1633 }
1634
1635 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1636 {
1637         struct sk_buff *skb = NULL;
1638         int type;
1639
1640         if (!pmc) {
1641                 read_lock_bh(&idev->lock);
1642                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1643                         if (pmc->mca_flags & MAF_NOREPORT)
1644                                 continue;
1645                         spin_lock_bh(&pmc->mca_lock);
1646                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1647                                 type = MLD2_MODE_IS_EXCLUDE;
1648                         else
1649                                 type = MLD2_MODE_IS_INCLUDE;
1650                         skb = add_grec(skb, pmc, type, 0, 0);
1651                         spin_unlock_bh(&pmc->mca_lock);
1652                 }
1653                 read_unlock_bh(&idev->lock);
1654         } else {
1655                 spin_lock_bh(&pmc->mca_lock);
1656                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1657                         type = MLD2_MODE_IS_EXCLUDE;
1658                 else
1659                         type = MLD2_MODE_IS_INCLUDE;
1660                 skb = add_grec(skb, pmc, type, 0, 0);
1661                 spin_unlock_bh(&pmc->mca_lock);
1662         }
1663         if (skb)
1664                 mld_sendpack(skb);
1665 }
1666
1667 /*
1668  * remove zero-count source records from a source filter list
1669  */
1670 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1671 {
1672         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1673
1674         psf_prev = NULL;
1675         for (psf=*ppsf; psf; psf = psf_next) {
1676                 psf_next = psf->sf_next;
1677                 if (psf->sf_crcount == 0) {
1678                         if (psf_prev)
1679                                 psf_prev->sf_next = psf->sf_next;
1680                         else
1681                                 *ppsf = psf->sf_next;
1682                         kfree(psf);
1683                 } else
1684                         psf_prev = psf;
1685         }
1686 }
1687
1688 static void mld_send_cr(struct inet6_dev *idev)
1689 {
1690         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1691         struct sk_buff *skb = NULL;
1692         int type, dtype;
1693
1694         read_lock_bh(&idev->lock);
1695         write_lock_bh(&idev->mc_lock);
1696
1697         /* deleted MCA's */
1698         pmc_prev = NULL;
1699         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1700                 pmc_next = pmc->next;
1701                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1702                         type = MLD2_BLOCK_OLD_SOURCES;
1703                         dtype = MLD2_BLOCK_OLD_SOURCES;
1704                         skb = add_grec(skb, pmc, type, 1, 0);
1705                         skb = add_grec(skb, pmc, dtype, 1, 1);
1706                 }
1707                 if (pmc->mca_crcount) {
1708                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1709                                 type = MLD2_CHANGE_TO_INCLUDE;
1710                                 skb = add_grec(skb, pmc, type, 1, 0);
1711                         }
1712                         pmc->mca_crcount--;
1713                         if (pmc->mca_crcount == 0) {
1714                                 mld_clear_zeros(&pmc->mca_tomb);
1715                                 mld_clear_zeros(&pmc->mca_sources);
1716                         }
1717                 }
1718                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1719                     !pmc->mca_sources) {
1720                         if (pmc_prev)
1721                                 pmc_prev->next = pmc_next;
1722                         else
1723                                 idev->mc_tomb = pmc_next;
1724                         in6_dev_put(pmc->idev);
1725                         kfree(pmc);
1726                 } else
1727                         pmc_prev = pmc;
1728         }
1729         write_unlock_bh(&idev->mc_lock);
1730
1731         /* change recs */
1732         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1733                 spin_lock_bh(&pmc->mca_lock);
1734                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1735                         type = MLD2_BLOCK_OLD_SOURCES;
1736                         dtype = MLD2_ALLOW_NEW_SOURCES;
1737                 } else {
1738                         type = MLD2_ALLOW_NEW_SOURCES;
1739                         dtype = MLD2_BLOCK_OLD_SOURCES;
1740                 }
1741                 skb = add_grec(skb, pmc, type, 0, 0);
1742                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1743
1744                 /* filter mode changes */
1745                 if (pmc->mca_crcount) {
1746                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1747                                 type = MLD2_CHANGE_TO_EXCLUDE;
1748                         else
1749                                 type = MLD2_CHANGE_TO_INCLUDE;
1750                         skb = add_grec(skb, pmc, type, 0, 0);
1751                         pmc->mca_crcount--;
1752                 }
1753                 spin_unlock_bh(&pmc->mca_lock);
1754         }
1755         read_unlock_bh(&idev->lock);
1756         if (!skb)
1757                 return;
1758         (void) mld_sendpack(skb);
1759 }
1760
1761 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1762 {
1763         struct net *net = dev_net(dev);
1764         struct sock *sk = net->ipv6.igmp_sk;
1765         struct inet6_dev *idev;
1766         struct sk_buff *skb;
1767         struct icmp6hdr *hdr;
1768         const struct in6_addr *snd_addr, *saddr;
1769         struct in6_addr *addrp;
1770         struct in6_addr addr_buf;
1771         int err, len, payload_len, full_len;
1772         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1773                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1774                      IPV6_TLV_PADN, 0 };
1775         struct flowi fl;
1776
1777         rcu_read_lock();
1778         IP6_INC_STATS(__in6_dev_get(dev),
1779                       IPSTATS_MIB_OUTREQUESTS);
1780         rcu_read_unlock();
1781         if (type == ICMPV6_MGM_REDUCTION)
1782                 snd_addr = &in6addr_linklocal_allrouters;
1783         else
1784                 snd_addr = addr;
1785
1786         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1787         payload_len = len + sizeof(ra);
1788         full_len = sizeof(struct ipv6hdr) + payload_len;
1789
1790         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1791
1792         if (skb == NULL) {
1793                 rcu_read_lock();
1794                 IP6_INC_STATS(__in6_dev_get(dev),
1795                               IPSTATS_MIB_OUTDISCARDS);
1796                 rcu_read_unlock();
1797                 return;
1798         }
1799
1800         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1801
1802         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1803                 /* <draft-ietf-magma-mld-source-05.txt>:
1804                  * use unspecified address as the source address
1805                  * when a valid link-local address is not available.
1806                  */
1807                 saddr = &in6addr_any;
1808         } else
1809                 saddr = &addr_buf;
1810
1811         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1812
1813         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1814
1815         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1816         memset(hdr, 0, sizeof(struct icmp6hdr));
1817         hdr->icmp6_type = type;
1818
1819         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1820         ipv6_addr_copy(addrp, addr);
1821
1822         hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1823                                            IPPROTO_ICMPV6,
1824                                            csum_partial((__u8 *) hdr, len, 0));
1825
1826         idev = in6_dev_get(skb->dev);
1827
1828         skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1829         if (!skb->dst) {
1830                 err = -ENOMEM;
1831                 goto err_out;
1832         }
1833
1834         icmpv6_flow_init(sk, &fl, type,
1835                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1836                          skb->dev->ifindex);
1837
1838         err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1839         if (err)
1840                 goto err_out;
1841
1842         err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1843                       dst_output);
1844 out:
1845         if (!err) {
1846                 ICMP6MSGOUT_INC_STATS(idev, type);
1847                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1848                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1849         } else
1850                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1851
1852         if (likely(idev != NULL))
1853                 in6_dev_put(idev);
1854         return;
1855
1856 err_out:
1857         kfree_skb(skb);
1858         goto out;
1859 }
1860
1861 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1862         struct in6_addr *psfsrc)
1863 {
1864         struct ip6_sf_list *psf, *psf_prev;
1865         int rv = 0;
1866
1867         psf_prev = NULL;
1868         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1869                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1870                         break;
1871                 psf_prev = psf;
1872         }
1873         if (!psf || psf->sf_count[sfmode] == 0) {
1874                 /* source filter not found, or count wrong =>  bug */
1875                 return -ESRCH;
1876         }
1877         psf->sf_count[sfmode]--;
1878         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1879                 struct inet6_dev *idev = pmc->idev;
1880
1881                 /* no more filters for this source */
1882                 if (psf_prev)
1883                         psf_prev->sf_next = psf->sf_next;
1884                 else
1885                         pmc->mca_sources = psf->sf_next;
1886                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1887                     !MLD_V1_SEEN(idev)) {
1888                         psf->sf_crcount = idev->mc_qrv;
1889                         psf->sf_next = pmc->mca_tomb;
1890                         pmc->mca_tomb = psf;
1891                         rv = 1;
1892                 } else
1893                         kfree(psf);
1894         }
1895         return rv;
1896 }
1897
1898 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1899                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1900                           int delta)
1901 {
1902         struct ifmcaddr6 *pmc;
1903         int     changerec = 0;
1904         int     i, err;
1905
1906         if (!idev)
1907                 return -ENODEV;
1908         read_lock_bh(&idev->lock);
1909         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1910                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1911                         break;
1912         }
1913         if (!pmc) {
1914                 /* MCA not found?? bug */
1915                 read_unlock_bh(&idev->lock);
1916                 return -ESRCH;
1917         }
1918         spin_lock_bh(&pmc->mca_lock);
1919         sf_markstate(pmc);
1920         if (!delta) {
1921                 if (!pmc->mca_sfcount[sfmode]) {
1922                         spin_unlock_bh(&pmc->mca_lock);
1923                         read_unlock_bh(&idev->lock);
1924                         return -EINVAL;
1925                 }
1926                 pmc->mca_sfcount[sfmode]--;
1927         }
1928         err = 0;
1929         for (i=0; i<sfcount; i++) {
1930                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1931
1932                 changerec |= rv > 0;
1933                 if (!err && rv < 0)
1934                         err = rv;
1935         }
1936         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1937             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1938             pmc->mca_sfcount[MCAST_INCLUDE]) {
1939                 struct ip6_sf_list *psf;
1940
1941                 /* filter mode change */
1942                 pmc->mca_sfmode = MCAST_INCLUDE;
1943                 pmc->mca_crcount = idev->mc_qrv;
1944                 idev->mc_ifc_count = pmc->mca_crcount;
1945                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1946                         psf->sf_crcount = 0;
1947                 mld_ifc_event(pmc->idev);
1948         } else if (sf_setstate(pmc) || changerec)
1949                 mld_ifc_event(pmc->idev);
1950         spin_unlock_bh(&pmc->mca_lock);
1951         read_unlock_bh(&idev->lock);
1952         return err;
1953 }
1954
1955 /*
1956  * Add multicast single-source filter to the interface list
1957  */
1958 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1959         struct in6_addr *psfsrc, int delta)
1960 {
1961         struct ip6_sf_list *psf, *psf_prev;
1962
1963         psf_prev = NULL;
1964         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1965                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1966                         break;
1967                 psf_prev = psf;
1968         }
1969         if (!psf) {
1970                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1971                 if (!psf)
1972                         return -ENOBUFS;
1973
1974                 psf->sf_addr = *psfsrc;
1975                 if (psf_prev) {
1976                         psf_prev->sf_next = psf;
1977                 } else
1978                         pmc->mca_sources = psf;
1979         }
1980         psf->sf_count[sfmode]++;
1981         return 0;
1982 }
1983
1984 static void sf_markstate(struct ifmcaddr6 *pmc)
1985 {
1986         struct ip6_sf_list *psf;
1987         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1988
1989         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1990                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1991                         psf->sf_oldin = mca_xcount ==
1992                                 psf->sf_count[MCAST_EXCLUDE] &&
1993                                 !psf->sf_count[MCAST_INCLUDE];
1994                 } else
1995                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1996 }
1997
1998 static int sf_setstate(struct ifmcaddr6 *pmc)
1999 {
2000         struct ip6_sf_list *psf, *dpsf;
2001         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2002         int qrv = pmc->idev->mc_qrv;
2003         int new_in, rv;
2004
2005         rv = 0;
2006         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2007                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2008                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2009                                 !psf->sf_count[MCAST_INCLUDE];
2010                 } else
2011                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2012                 if (new_in) {
2013                         if (!psf->sf_oldin) {
2014                                 struct ip6_sf_list *prev = NULL;
2015
2016                                 for (dpsf=pmc->mca_tomb; dpsf;
2017                                      dpsf=dpsf->sf_next) {
2018                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2019                                             &psf->sf_addr))
2020                                                 break;
2021                                         prev = dpsf;
2022                                 }
2023                                 if (dpsf) {
2024                                         if (prev)
2025                                                 prev->sf_next = dpsf->sf_next;
2026                                         else
2027                                                 pmc->mca_tomb = dpsf->sf_next;
2028                                         kfree(dpsf);
2029                                 }
2030                                 psf->sf_crcount = qrv;
2031                                 rv++;
2032                         }
2033                 } else if (psf->sf_oldin) {
2034                         psf->sf_crcount = 0;
2035                         /*
2036                          * add or update "delete" records if an active filter
2037                          * is now inactive
2038                          */
2039                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2040                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2041                                     &psf->sf_addr))
2042                                         break;
2043                         if (!dpsf) {
2044                                 dpsf = (struct ip6_sf_list *)
2045                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2046                                 if (!dpsf)
2047                                         continue;
2048                                 *dpsf = *psf;
2049                                 /* pmc->mca_lock held by callers */
2050                                 dpsf->sf_next = pmc->mca_tomb;
2051                                 pmc->mca_tomb = dpsf;
2052                         }
2053                         dpsf->sf_crcount = qrv;
2054                         rv++;
2055                 }
2056         }
2057         return rv;
2058 }
2059
2060 /*
2061  * Add multicast source filter list to the interface list
2062  */
2063 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2064                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2065                           int delta)
2066 {
2067         struct ifmcaddr6 *pmc;
2068         int     isexclude;
2069         int     i, err;
2070
2071         if (!idev)
2072                 return -ENODEV;
2073         read_lock_bh(&idev->lock);
2074         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2075                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2076                         break;
2077         }
2078         if (!pmc) {
2079                 /* MCA not found?? bug */
2080                 read_unlock_bh(&idev->lock);
2081                 return -ESRCH;
2082         }
2083         spin_lock_bh(&pmc->mca_lock);
2084
2085         sf_markstate(pmc);
2086         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2087         if (!delta)
2088                 pmc->mca_sfcount[sfmode]++;
2089         err = 0;
2090         for (i=0; i<sfcount; i++) {
2091                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2092                 if (err)
2093                         break;
2094         }
2095         if (err) {
2096                 int j;
2097
2098                 if (!delta)
2099                         pmc->mca_sfcount[sfmode]--;
2100                 for (j=0; j<i; j++)
2101                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2102         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2103                 struct inet6_dev *idev = pmc->idev;
2104                 struct ip6_sf_list *psf;
2105
2106                 /* filter mode change */
2107                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2108                         pmc->mca_sfmode = MCAST_EXCLUDE;
2109                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2110                         pmc->mca_sfmode = MCAST_INCLUDE;
2111                 /* else no filters; keep old mode for reports */
2112
2113                 pmc->mca_crcount = idev->mc_qrv;
2114                 idev->mc_ifc_count = pmc->mca_crcount;
2115                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2116                         psf->sf_crcount = 0;
2117                 mld_ifc_event(idev);
2118         } else if (sf_setstate(pmc))
2119                 mld_ifc_event(idev);
2120         spin_unlock_bh(&pmc->mca_lock);
2121         read_unlock_bh(&idev->lock);
2122         return err;
2123 }
2124
2125 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2126 {
2127         struct ip6_sf_list *psf, *nextpsf;
2128
2129         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2130                 nextpsf = psf->sf_next;
2131                 kfree(psf);
2132         }
2133         pmc->mca_tomb = NULL;
2134         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2135                 nextpsf = psf->sf_next;
2136                 kfree(psf);
2137         }
2138         pmc->mca_sources = NULL;
2139         pmc->mca_sfmode = MCAST_EXCLUDE;
2140         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2141         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2142 }
2143
2144
2145 static void igmp6_join_group(struct ifmcaddr6 *ma)
2146 {
2147         unsigned long delay;
2148
2149         if (ma->mca_flags & MAF_NOREPORT)
2150                 return;
2151
2152         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2153
2154         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2155
2156         spin_lock_bh(&ma->mca_lock);
2157         if (del_timer(&ma->mca_timer)) {
2158                 atomic_dec(&ma->mca_refcnt);
2159                 delay = ma->mca_timer.expires - jiffies;
2160         }
2161
2162         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2163                 atomic_inc(&ma->mca_refcnt);
2164         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2165         spin_unlock_bh(&ma->mca_lock);
2166 }
2167
2168 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2169                             struct inet6_dev *idev)
2170 {
2171         int err;
2172
2173         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2174          * so no other readers or writers of iml or its sflist
2175          */
2176         if (!iml->sflist) {
2177                 /* any-source empty exclude case */
2178                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2179         }
2180         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2181                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2182         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2183         iml->sflist = NULL;
2184         return err;
2185 }
2186
2187 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2188 {
2189         if (MLD_V1_SEEN(ma->idev)) {
2190                 if (ma->mca_flags & MAF_LAST_REPORTER)
2191                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2192                                 ICMPV6_MGM_REDUCTION);
2193         } else {
2194                 mld_add_delrec(ma->idev, ma);
2195                 mld_ifc_event(ma->idev);
2196         }
2197 }
2198
2199 static void mld_gq_timer_expire(unsigned long data)
2200 {
2201         struct inet6_dev *idev = (struct inet6_dev *)data;
2202
2203         idev->mc_gq_running = 0;
2204         mld_send_report(idev, NULL);
2205         __in6_dev_put(idev);
2206 }
2207
2208 static void mld_ifc_timer_expire(unsigned long data)
2209 {
2210         struct inet6_dev *idev = (struct inet6_dev *)data;
2211
2212         mld_send_cr(idev);
2213         if (idev->mc_ifc_count) {
2214                 idev->mc_ifc_count--;
2215                 if (idev->mc_ifc_count)
2216                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2217         }
2218         __in6_dev_put(idev);
2219 }
2220
2221 static void mld_ifc_event(struct inet6_dev *idev)
2222 {
2223         if (MLD_V1_SEEN(idev))
2224                 return;
2225         idev->mc_ifc_count = idev->mc_qrv;
2226         mld_ifc_start_timer(idev, 1);
2227 }
2228
2229
2230 static void igmp6_timer_handler(unsigned long data)
2231 {
2232         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2233
2234         if (MLD_V1_SEEN(ma->idev))
2235                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2236         else
2237                 mld_send_report(ma->idev, ma);
2238
2239         spin_lock(&ma->mca_lock);
2240         ma->mca_flags |=  MAF_LAST_REPORTER;
2241         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2242         spin_unlock(&ma->mca_lock);
2243         ma_put(ma);
2244 }
2245
2246 /* Device going down */
2247
2248 void ipv6_mc_down(struct inet6_dev *idev)
2249 {
2250         struct ifmcaddr6 *i;
2251
2252         /* Withdraw multicast list */
2253
2254         read_lock_bh(&idev->lock);
2255         idev->mc_ifc_count = 0;
2256         if (del_timer(&idev->mc_ifc_timer))
2257                 __in6_dev_put(idev);
2258         idev->mc_gq_running = 0;
2259         if (del_timer(&idev->mc_gq_timer))
2260                 __in6_dev_put(idev);
2261
2262         for (i = idev->mc_list; i; i=i->next)
2263                 igmp6_group_dropped(i);
2264         read_unlock_bh(&idev->lock);
2265
2266         mld_clear_delrec(idev);
2267 }
2268
2269
2270 /* Device going up */
2271
2272 void ipv6_mc_up(struct inet6_dev *idev)
2273 {
2274         struct ifmcaddr6 *i;
2275
2276         /* Install multicast list, except for all-nodes (already installed) */
2277
2278         read_lock_bh(&idev->lock);
2279         for (i = idev->mc_list; i; i=i->next)
2280                 igmp6_group_added(i);
2281         read_unlock_bh(&idev->lock);
2282 }
2283
2284 /* IPv6 device initialization. */
2285
2286 void ipv6_mc_init_dev(struct inet6_dev *idev)
2287 {
2288         write_lock_bh(&idev->lock);
2289         rwlock_init(&idev->mc_lock);
2290         idev->mc_gq_running = 0;
2291         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2292                         (unsigned long)idev);
2293         idev->mc_tomb = NULL;
2294         idev->mc_ifc_count = 0;
2295         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2296                         (unsigned long)idev);
2297         idev->mc_qrv = MLD_QRV_DEFAULT;
2298         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2299         idev->mc_v1_seen = 0;
2300         write_unlock_bh(&idev->lock);
2301 }
2302
2303 /*
2304  *      Device is about to be destroyed: clean up.
2305  */
2306
2307 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2308 {
2309         struct ifmcaddr6 *i;
2310
2311         /* Deactivate timers */
2312         ipv6_mc_down(idev);
2313
2314         /* Delete all-nodes address. */
2315         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2316          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2317          * fail.
2318          */
2319         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2320
2321         if (idev->cnf.forwarding)
2322                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2323
2324         write_lock_bh(&idev->lock);
2325         while ((i = idev->mc_list) != NULL) {
2326                 idev->mc_list = i->next;
2327                 write_unlock_bh(&idev->lock);
2328
2329                 igmp6_group_dropped(i);
2330                 ma_put(i);
2331
2332                 write_lock_bh(&idev->lock);
2333         }
2334         write_unlock_bh(&idev->lock);
2335 }
2336
2337 #ifdef CONFIG_PROC_FS
2338 struct igmp6_mc_iter_state {
2339         struct seq_net_private p;
2340         struct net_device *dev;
2341         struct inet6_dev *idev;
2342 };
2343
2344 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2345
2346 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2347 {
2348         struct ifmcaddr6 *im = NULL;
2349         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2350         struct net *net = seq_file_net(seq);
2351
2352         state->idev = NULL;
2353         for_each_netdev(net, state->dev) {
2354                 struct inet6_dev *idev;
2355                 idev = in6_dev_get(state->dev);
2356                 if (!idev)
2357                         continue;
2358                 read_lock_bh(&idev->lock);
2359                 im = idev->mc_list;
2360                 if (im) {
2361                         state->idev = idev;
2362                         break;
2363                 }
2364                 read_unlock_bh(&idev->lock);
2365                 in6_dev_put(idev);
2366         }
2367         return im;
2368 }
2369
2370 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2371 {
2372         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2373
2374         im = im->next;
2375         while (!im) {
2376                 if (likely(state->idev != NULL)) {
2377                         read_unlock_bh(&state->idev->lock);
2378                         in6_dev_put(state->idev);
2379                 }
2380                 state->dev = next_net_device(state->dev);
2381                 if (!state->dev) {
2382                         state->idev = NULL;
2383                         break;
2384                 }
2385                 state->idev = in6_dev_get(state->dev);
2386                 if (!state->idev)
2387                         continue;
2388                 read_lock_bh(&state->idev->lock);
2389                 im = state->idev->mc_list;
2390         }
2391         return im;
2392 }
2393
2394 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2395 {
2396         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2397         if (im)
2398                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2399                         --pos;
2400         return pos ? NULL : im;
2401 }
2402
2403 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2404         __acquires(dev_base_lock)
2405 {
2406         read_lock(&dev_base_lock);
2407         return igmp6_mc_get_idx(seq, *pos);
2408 }
2409
2410 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2411 {
2412         struct ifmcaddr6 *im;
2413         im = igmp6_mc_get_next(seq, v);
2414         ++*pos;
2415         return im;
2416 }
2417
2418 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2419         __releases(dev_base_lock)
2420 {
2421         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2422         if (likely(state->idev != NULL)) {
2423                 read_unlock_bh(&state->idev->lock);
2424                 in6_dev_put(state->idev);
2425                 state->idev = NULL;
2426         }
2427         state->dev = NULL;
2428         read_unlock(&dev_base_lock);
2429 }
2430
2431 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2432 {
2433         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2434         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2435
2436         seq_printf(seq,
2437                    "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2438                    state->dev->ifindex, state->dev->name,
2439                    NIP6(im->mca_addr),
2440                    im->mca_users, im->mca_flags,
2441                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2442                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2443         return 0;
2444 }
2445
2446 static const struct seq_operations igmp6_mc_seq_ops = {
2447         .start  =       igmp6_mc_seq_start,
2448         .next   =       igmp6_mc_seq_next,
2449         .stop   =       igmp6_mc_seq_stop,
2450         .show   =       igmp6_mc_seq_show,
2451 };
2452
2453 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2454 {
2455         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2456                             sizeof(struct igmp6_mc_iter_state));
2457 }
2458
2459 static const struct file_operations igmp6_mc_seq_fops = {
2460         .owner          =       THIS_MODULE,
2461         .open           =       igmp6_mc_seq_open,
2462         .read           =       seq_read,
2463         .llseek         =       seq_lseek,
2464         .release        =       seq_release_net,
2465 };
2466
2467 struct igmp6_mcf_iter_state {
2468         struct seq_net_private p;
2469         struct net_device *dev;
2470         struct inet6_dev *idev;
2471         struct ifmcaddr6 *im;
2472 };
2473
2474 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2475
2476 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2477 {
2478         struct ip6_sf_list *psf = NULL;
2479         struct ifmcaddr6 *im = NULL;
2480         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2481         struct net *net = seq_file_net(seq);
2482
2483         state->idev = NULL;
2484         state->im = NULL;
2485         for_each_netdev(net, state->dev) {
2486                 struct inet6_dev *idev;
2487                 idev = in6_dev_get(state->dev);
2488                 if (unlikely(idev == NULL))
2489                         continue;
2490                 read_lock_bh(&idev->lock);
2491                 im = idev->mc_list;
2492                 if (likely(im != NULL)) {
2493                         spin_lock_bh(&im->mca_lock);
2494                         psf = im->mca_sources;
2495                         if (likely(psf != NULL)) {
2496                                 state->im = im;
2497                                 state->idev = idev;
2498                                 break;
2499                         }
2500                         spin_unlock_bh(&im->mca_lock);
2501                 }
2502                 read_unlock_bh(&idev->lock);
2503                 in6_dev_put(idev);
2504         }
2505         return psf;
2506 }
2507
2508 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2509 {
2510         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2511
2512         psf = psf->sf_next;
2513         while (!psf) {
2514                 spin_unlock_bh(&state->im->mca_lock);
2515                 state->im = state->im->next;
2516                 while (!state->im) {
2517                         if (likely(state->idev != NULL)) {
2518                                 read_unlock_bh(&state->idev->lock);
2519                                 in6_dev_put(state->idev);
2520                         }
2521                         state->dev = next_net_device(state->dev);
2522                         if (!state->dev) {
2523                                 state->idev = NULL;
2524                                 goto out;
2525                         }
2526                         state->idev = in6_dev_get(state->dev);
2527                         if (!state->idev)
2528                                 continue;
2529                         read_lock_bh(&state->idev->lock);
2530                         state->im = state->idev->mc_list;
2531                 }
2532                 if (!state->im)
2533                         break;
2534                 spin_lock_bh(&state->im->mca_lock);
2535                 psf = state->im->mca_sources;
2536         }
2537 out:
2538         return psf;
2539 }
2540
2541 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2542 {
2543         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2544         if (psf)
2545                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2546                         --pos;
2547         return pos ? NULL : psf;
2548 }
2549
2550 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2551         __acquires(dev_base_lock)
2552 {
2553         read_lock(&dev_base_lock);
2554         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2555 }
2556
2557 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2558 {
2559         struct ip6_sf_list *psf;
2560         if (v == SEQ_START_TOKEN)
2561                 psf = igmp6_mcf_get_first(seq);
2562         else
2563                 psf = igmp6_mcf_get_next(seq, v);
2564         ++*pos;
2565         return psf;
2566 }
2567
2568 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2569         __releases(dev_base_lock)
2570 {
2571         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2572         if (likely(state->im != NULL)) {
2573                 spin_unlock_bh(&state->im->mca_lock);
2574                 state->im = NULL;
2575         }
2576         if (likely(state->idev != NULL)) {
2577                 read_unlock_bh(&state->idev->lock);
2578                 in6_dev_put(state->idev);
2579                 state->idev = NULL;
2580         }
2581         state->dev = NULL;
2582         read_unlock(&dev_base_lock);
2583 }
2584
2585 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2586 {
2587         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2588         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2589
2590         if (v == SEQ_START_TOKEN) {
2591                 seq_printf(seq,
2592                            "%3s %6s "
2593                            "%32s %32s %6s %6s\n", "Idx",
2594                            "Device", "Multicast Address",
2595                            "Source Address", "INC", "EXC");
2596         } else {
2597                 seq_printf(seq,
2598                            "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2599                            state->dev->ifindex, state->dev->name,
2600                            NIP6(state->im->mca_addr),
2601                            NIP6(psf->sf_addr),
2602                            psf->sf_count[MCAST_INCLUDE],
2603                            psf->sf_count[MCAST_EXCLUDE]);
2604         }
2605         return 0;
2606 }
2607
2608 static const struct seq_operations igmp6_mcf_seq_ops = {
2609         .start  =       igmp6_mcf_seq_start,
2610         .next   =       igmp6_mcf_seq_next,
2611         .stop   =       igmp6_mcf_seq_stop,
2612         .show   =       igmp6_mcf_seq_show,
2613 };
2614
2615 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2616 {
2617         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2618                             sizeof(struct igmp6_mcf_iter_state));
2619 }
2620
2621 static const struct file_operations igmp6_mcf_seq_fops = {
2622         .owner          =       THIS_MODULE,
2623         .open           =       igmp6_mcf_seq_open,
2624         .read           =       seq_read,
2625         .llseek         =       seq_lseek,
2626         .release        =       seq_release_net,
2627 };
2628
2629 static int igmp6_proc_init(struct net *net)
2630 {
2631         int err;
2632
2633         err = -ENOMEM;
2634         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2635                 goto out;
2636         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2637                                   &igmp6_mcf_seq_fops))
2638                 goto out_proc_net_igmp6;
2639
2640         err = 0;
2641 out:
2642         return err;
2643
2644 out_proc_net_igmp6:
2645         proc_net_remove(net, "igmp6");
2646         goto out;
2647 }
2648
2649 static void igmp6_proc_exit(struct net *net)
2650 {
2651         proc_net_remove(net, "mcfilter6");
2652         proc_net_remove(net, "igmp6");
2653 }
2654 #else
2655 static int igmp6_proc_init(struct net *net)
2656 {
2657         return 0;
2658 }
2659 static void igmp6_proc_exit(struct net *net)
2660 {
2661         ;
2662 }
2663 #endif
2664
2665 static int igmp6_net_init(struct net *net)
2666 {
2667         int err;
2668
2669         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2670                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2671         if (err < 0) {
2672                 printk(KERN_ERR
2673                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2674                        err);
2675                 goto out;
2676         }
2677
2678         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2679
2680         err = igmp6_proc_init(net);
2681         if (err)
2682                 goto out_sock_create;
2683 out:
2684         return err;
2685
2686 out_sock_create:
2687         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2688         goto out;
2689 }
2690
2691 static void igmp6_net_exit(struct net *net)
2692 {
2693         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2694         igmp6_proc_exit(net);
2695 }
2696
2697 static struct pernet_operations igmp6_net_ops = {
2698         .init = igmp6_net_init,
2699         .exit = igmp6_net_exit,
2700 };
2701
2702 int __init igmp6_init(void)
2703 {
2704         return register_pernet_subsys(&igmp6_net_ops);
2705 }
2706
2707 void igmp6_cleanup(void)
2708 {
2709         unregister_pernet_subsys(&igmp6_net_ops);
2710 }